JPH09194152A - Hydraulic elevator equipment - Google Patents

Abstract

(57) Abstract: A hydraulic elevator device for performing a low speed descending operation by an opening / closing valve for a normal descending operation. SOLUTION: The car 2 opens when traveling, and the car 2
Is provided with an on-off valve 5 that closes when the engine is stopped, and the controller 13 controls the rotation of the electric motor 4 of the hydraulic pump 3.
By changing the discharge flow rate of the hydraulic pump 3 to control the raising of the car 2 engaged with the hydraulic jack 1, and controlling the rotation of the electric motor 4 to control the discharge flow rate of the pressure oil in the hydraulic jack 1
Normal down operation. Further, a low speed lowering control means 32 is provided which makes the opening degree of the on-off valve 5 during the low speed lowering operation smaller than that during the normal lowering operation. [Effect] Even if a power failure occurs during low-speed descent, the car immediately stops to improve safety, and a simple structure with a small number of parts enables low-speed descent operation and reduces manufacturing costs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator apparatus in which a car is engaged with a hydraulic jack and moves up and down.

[0002]

2. Description of the Related Art FIG.
FIG. 2 is a hydraulic circuit diagram showing a conventional hydraulic elevator device similar to the hydraulic elevator device disclosed in Japanese Patent Application Publication No. H10-115,004. In the figure, 1 is a hydraulic jack having a plunger 1a,
2 is a basket supported by the plunger 1a, 3 is a hydraulic pump capable of reversible rotation, 4 is an electric motor for driving the hydraulic pump 3, 5 is a first opening / closing valve, and is a main chamber via a main chamber 5a and a valve body 5b. A back room 5c isolated from 5a is provided.

The first opening / closing valve 5 has a main chamber 5a communicating with the hydraulic jack 1 and the hydraulic pump 3, and the valve body 5b is actuated by the inflow and outflow of pressurized oil in the back chamber 5c. 3 is opened and closed when the car 2 is running, and closed when the car 2 is stopped.

Reference numeral 6 is a first hydraulic main circuit, in which a hydraulic jack 1, a first opening / closing valve 5 and a hydraulic pump 3 are sequentially connected, and a first circuit 6a is formed between the first opening / closing valve 5 and the hydraulic pump 3. ,
Further, the second circuit 6b is provided between the hydraulic jack 1 and the first opening / closing valve 5.
Is formed. Reference numeral 7 is a filter, 8 is an oil tank, and 9 is a pilot circuit, which connects a hydraulic oil inflow circuit 9a connecting the hydraulic jack 1 and the back chamber 5c of the first opening / closing valve 5, and the back chamber 5c of the first opening / closing valve 5 to the oil tank 8. A first pressure oil discharge circuit 9b and a second pressure oil discharge circuit 9c are provided.

A normally closed solenoid valve 10 is provided in the first pressure oil discharge circuit 9b to open or close the first pressure oil discharge circuit 9b. Reference numeral 11 is a variable throttle valve provided in the pressure oil inflow circuit 9a, 12 is a variable throttle valve provided in the first pressure oil discharge circuit 9b, 13 is a normally closed solenoid valve 10, and a hydraulic pump 3
It is a control device connected to an electric motor for driving the motor and other devices described later.

An opening adjustment 14 is provided in the back chamber 5c of the first opening / closing valve 5 so that the first opening / closing valve 5 can be maintained at a predetermined opening between full open and fully closed during the decelerating operation of the descending operation. At the aperture,
An adjusting screw 14a for adjusting the opening of the variable aperture 14c of the opening adjusting aperture 14 and a sleeve 14b for forming the opening of the variable aperture 14c are provided between the adjusting screw 14a and the adjusting screw 14a. Reference numeral 15 denotes a normally closed solenoid valve, and reference numeral 16 denotes a variable adjustment throttle. Reference numeral 17 denotes a hydraulic second main circuit, which is a second main circuit first circuit 1
7a and a second main circuit second circuit 17b,
Hydraulic pump 3, first on-off valve 5, second on-off valve 1 described later
8. Connect the hydraulic jacks 1 sequentially.

Reference numeral 18 denotes a second on-off valve, which comprises a main chamber 18a and the valve element 1
The main chamber 18a and the back chamber 18c are connected to each other through a passage 18d and open when pressure oil flows from the hydraulic pump 3 into the hydraulic jack 1. Then, a pressing spring 18e is provided to urge the valve body 18b and a piston 18f described later in a direction away from each other. Also,
Piston 18f engaged with valve element 18b, piston 18f
18g, and a stopper 18h for the piston 18f.

Reference numeral 19 denotes a first pilot circuit, which is a first A pilot circuit 19a for connecting the hydraulic jack 1 and a back chamber 18g of the second on-off valve 18, and a back chamber 18g of the second on-off valve 18.
And a hydraulic pump 3, a third opening / closing valve described later, and a first B pilot circuit 19b connecting a third main circuit described later in which the oil tank 8 is sequentially connected. 20 is a normally closed solenoid valve provided in the first B pilot circuit 19b, 21
Is a throttle provided in the first A pilot circuit 19a for adjusting the amount of pressure oil flowing from the hydraulic jack 1 to the back chamber 18g of the second on-off valve 18.

Reference numeral 22 denotes a throttle provided in the first B pilot circuit 19b for adjusting the amount of pressure oil flowing out from the back chamber 18g of the second on-off valve 18. Reference numeral 23 denotes a third opening / closing valve,
a main body 23a separated by the valve body 23b, a back spring 23d provided in the back chamber 23c to press the valve body 23b in the closing direction, a third on-off valve 23 First blocking piece 2 for blocking the opening at a predetermined position
3e and a second blocking piece 23f for preventing the third opening / closing valve 23, which is normally in a fully closed state, from closing beyond a predetermined position are provided.

In the third opening / closing valve 23, the main chamber 23a is connected between the hydraulic pump 3 and the oil tank 8, and the valve body 23b is operated by the inflow / outflow of the pressure oil in the back chamber 23c. The pressure oil passage between the oil tanks 8 is opened and closed. A second pilot circuit 24 connects a third main circuit, which will be described later, to a back chamber 23c of the third on-off valve 23, and is provided with a throttle 25.

Reference numeral 26 denotes a third pilot circuit provided between the back chamber 23c of the third on-off valve 23 and the oil tank 8, and a normally closed solenoid valve 27 is provided. 28 is a third main circuit formed between the hydraulic pump 3, the second on-off valve 18, the third on-off valve 23 and the oil tank 8, and 29 is provided in the third main circuit 28 and includes the hydraulic pump 3 and the second on-off valve A check valve disposed between the valves 18 prevents flow of hydraulic oil to the hydraulic pump 3.

The conventional hydraulic elevator apparatus is configured as described above, and if the car 2 is now operated to ascend, the components operate as described below. That is, when an ascending operation command is issued from the operation control device (not shown) of the hydraulic elevator device, the operation of the control device 13 causes the electric motor 4 to operate.
Is rotationally controlled and urged, and the hydraulic pump 3 is driven. The pressure oil inflow circuit 9a is closed, and then the normally closed solenoid valve 10 is energized to open the first pressure oil discharge circuit 9b. As a result, the pressure oil in the back chamber 5c of the first opening / closing valve 5 is discharged to the oil tank 8 and the first opening / closing valve 5 opens.

The pressure oil discharged from the hydraulic pump 3 through the opening of the first opening / closing valve 5 is transferred from the first opening / closing valve 5 to the hydraulic jack 1.
Flow into. Then, by controlling the rotation speed of the electric motor 4 by the control device 13, the car 2 rises according to a predetermined operation pattern. When the car 2 rises and reaches a predetermined position, the controller 13 issues a closing command for the first on-off valve 5 to turn off the normally closed solenoid valve 10 provided in the first pressure oil discharge circuit 9b. Energized and the first pressure oil discharge circuit 9
b is closed, and the pressure oil inflow circuit 9a is opened. Then, the pressure oil flows into the back chamber 5c of the first opening / closing valve 5, and the first opening / closing valve 5
Will be fully closed.

Further, when the operation control device of the hydraulic elevator device issues a descending operation command during the descending operation of the car 2, the operation of the control device 13 controls the rotation speed of the electric motor 4 to urge the electric motor 4. 9a is closed, then the normally closed solenoid valve 10 is energized, and the first pressure oil discharge circuit 9b
Opens. As a result, the pressure oil in the back chamber 5c of the first opening / closing valve 5 is discharged to the oil tank 8 and the first opening / closing valve 5 opens.

The pressure oil in the hydraulic jack 1 is pushed out by the opening of the first opening / closing valve 5 by the own weight of the car 2, passes through the hydraulic jack 1, the first opening / closing valve 5, the hydraulic pump 3 and the filter 7, and then the oil tank 8 Is discharged to. After that, the hydraulic pump 3 driven by the electric motor 4 by the control device 13 discharges the pressure oil in the hydraulic jack 1. Further, the electric motor 4 connected to the hydraulic pump 3 for driving the hydraulic pump 3 is driven by the dynamic braking by the pressure in the hydraulic jack 1 generated by the own weight of the car 2 and the flow rate discharged from the hydraulic jack 1.

As a result, the rotation speed of the electric motor 4 is controlled by the control device 13, and the car 2 is descended at a high operation speed, that is, normally descended according to a predetermined operation pattern. When the car 2 descends and reaches a predetermined position, the control device 13 issues a closing command for the first on-off valve 5 to turn off the normally closed solenoid valve 10 provided in the first pressure oil discharge circuit 9b. Energized to the first pressure oil discharge circuit 9b
Is closed, and the pressure oil inflow circuit 9a is opened. Then, the pressure oil flows into the back chamber 5c of the first opening / closing valve 5 to fully close the first opening / closing valve 5.

In a normal operating state, that is, when the controller 2 issues a low-speed lowering operation command for maintenance work or the like with the car 2 supported by the plunger 1a of the hydraulic jack 1, the third opening / closing operation is performed. The normally closed solenoid valve 27 for controlling the valve 23 is energized to activate the third pilot circuit 2
The pressure oil is discharged from the back chamber 23c of the third on-off valve 23 to the oil tank 8 through 6. It should be noted that if the normally closed solenoid valve 27 is only energized, the valve element 23b of the third opening / closing valve 23 will cause the pressing spring 23 to move.
Since it is pressed by d, it does not open.

After the passage of the normally closed solenoid valve 27 is completely opened, the normally closed solenoid valve 20 for controlling the second opening / closing valve 18 is energized. As a result, the pressure oil is discharged from the back chamber 18g of the second opening / closing valve 18 to the third main circuit 28 through the first A pilot circuit 19a and the throttle 21 so that the piston 18f moves away from the stopper 18h and the piston 18f and the valve body 18b. Move together. As a result, the pressure oil of the hydraulic jack 1 flows through the second main circuit 17 and the second opening / closing valve 18 to the third main circuit 28.

Then, the valve body 23b of the third on-off valve 23 is pushed by the pressure of the pressure oil flowing through the third main circuit 28, and moves and opens against the pushing force of the pushing spring 23d. At this time,
The opening area of the third opening / closing valve 23 corresponds to the flow rate passing through. Therefore, the acceleration time when the car 2 is lowered can be adjusted by adjusting the opening area of the diaphragm 22 of the first B pilot circuit 19b. Then, the second opening / closing valve 18 gradually opens to increase the flow rate of the pressure oil flowing from the hydraulic jack 1 through the second opening / closing valve 18 to the third main circuit 28, thereby increasing the cage 2
Accelerates.

When a stop command for the low speed descent operation is issued, a normally closed solenoid valve 20 for controlling the second opening / closing valve 18 is provided.
Is extinguished. Thereby, the back chamber 18 of the second opening / closing valve 18
The pressure oil is no longer discharged from g to the third main circuit 28, and the hydraulic jack 1 is connected to the first A pilot circuit 19a and the throttle 21.
The pressure oil flows into the back chamber 18g through. Therefore, the piston 18f and the valve body 18b move integrally and gradually close in the direction of blocking the passage of the second main circuit 17.

As a result, the flow rate of the pressure oil flowing from the hydraulic jack 1 through the second opening / closing valve 18 to the third main circuit 28 is reduced, and the car 2 decelerates. Therefore, basket 2
The stop time can be adjusted by adjusting the opening area of the diaphragm 21 of the first A pilot circuit 19a.

The opening area of the third on-off valve 23 corresponds to the flow rate of the pressure oil passing therethrough, but even if the car 2 stops and the flow rate from the hydraulic jack 1 to the third main circuit 28 disappears. There is some delay until it is fully closed. Therefore, the normally closed solenoid valve 27 of the third pilot circuit 26 is deenergized only after the predetermined time elapses after the normally closed solenoid valve 20 is deenergized until the third opening / closing valve 23 is fully closed. .

On the other hand, the normally closed solenoid valve 27 is urged by the pressing force of the pressing spring 23d that presses the valve body 23b of the third on-off valve 23 in the direction to normally close the oil tank through the third pilot circuit 26. There are both pressure oil flowing from 8 to the back chamber 23c and pressure oil flowing into the back chamber 23c through the second pilot circuit 24. On the other hand, after the solenoid valve 20 is deenergized, the solenoid valve 27 is deenergized after a lapse of a predetermined time so that the time from the second opening / closing valve 18 being fully closed to the third opening / closing valve 23 being fully closed. Can be shortened.

[0024]

In the conventional hydraulic elevator system as described above, both the second on-off valve 18 and the third on-off valve 23 and the respective devices associated with both of them for the low speed descending operation of the car 2. However, the number of parts is increased, and the control becomes complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a hydraulic elevator system for performing a low speed descending operation by an opening / closing valve for a high speed descending operation, that is, a normal descending operation. To do.

[0026]

In a hydraulic elevator system according to the present invention, the rotational speed of an electric motor that drives a hydraulic pump that pumps pressure oil to a hydraulic jack is changed to change the discharge flow rate of the hydraulic pump. A control device that controls the raising operation of the car engaged with the jack, changes the rotation speed of the electric motor to control the discharge flow rate of the pressure oil in the hydraulic jack, and controls the descending operation of the car. An open / close valve that is installed between pumps and opens when the car runs, and closes when the car is stopped, and a low speed that reduces the opening degree of this open / close valve during low speed down operation compared to during normal down operation Descent control means are provided.

Further, in the hydraulic elevator system according to the present invention, the pressure oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. There is provided low speed lowering control means for running and stopping the car in the low speed lowering operation by controlling the flow rate by gradually closing the opening / closing valve.

Further, in the hydraulic elevator system according to the present invention, the pressure oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. The car is stopped during flow control by gradually closing the on-off valve during running at low speed, and even if the pressure between the hydraulic jack and the on-off valve changes, the hydraulic pump motor is controlled by the electric motor of the hydraulic pump. A low speed lowering control means for controlling the pressure between the on-off valves to a predetermined value is provided.

Further, in the hydraulic elevator apparatus according to the present invention, the pressure oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. Open and close the hydraulic oil of the hydraulic jack after running and stopping the car in the low speed descent operation by the flow control by gradually closing the open / close valve and generating pressure by the hydraulic oil between the hydraulic pump and the open / close valve. A low speed descent control means for starting the operation of the hydraulic pump in the direction of discharging through the valve and the hydraulic pump is provided.

Further, in the hydraulic elevator apparatus according to the present invention, the pressure oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. The hydraulic pump and the opening / closing valve are stopped when the car is stopped by flow rate control by gradually closing the opening / closing valve during traveling at low speed and when the pressure between the hydraulic pump and the opening / closing valve is outside the predetermined value range. When the pressure between the hydraulic pump and the on-off valve does not fall within the predetermined value range within a predetermined time after the start of the control to increase or decrease the rotation speed of the hydraulic pump in the direction of discharging the pressure oil, Low speed descent control means for stopping the operation of the electric motor is provided.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is a hydraulic circuit diagram showing an example of an embodiment of the present invention. In the drawing, 1 is a hydraulic jack having a plunger 1a, 2 is a basket supported by the plunger 1a, 3 is a hydraulic pump capable of reversible rotation, 4 is an electric motor for driving the hydraulic pump 3, 5 is an opening / closing valve, Room 5a
Further, a back chamber 5c is provided which is separated from the main chamber 5a via the valve body 5b.

Further, in the on-off valve 5, the main chamber 5a communicates with the hydraulic jack 1 and the hydraulic pump 3, and the valve body 5b is actuated by the inflow and outflow of the pressure oil in the back chamber 5c to connect the hydraulic jack 1 and the hydraulic pump 3 to each other. The pressure oil flow path between the two is opened and closed when the car 2 is running, and closed when the car 2 is stopped.

Reference numeral 6 denotes a hydraulic main circuit, in which the hydraulic jack 1, the opening / closing valve 5 and the hydraulic pump 3 are sequentially connected, a first circuit 6a is formed between the opening / closing valve 5 and the hydraulic pump 3, and the hydraulic jack 1 and A second circuit 6b is formed between the on-off valves 5. Reference numeral 7 is a filter, 8 is an oil tank, 9 is a pilot circuit, and a pressure oil inflow circuit 9 that connects the hydraulic jack 1 and the back chamber 5c of the on-off valve 5
a, a first pressure oil discharge circuit 9b and a second pressure oil discharge circuit 9c that connect the back chamber 5c of the on-off valve 5 and the oil tank 8 are provided.

Reference numeral 10 denotes a normally closed solenoid valve provided in the first pressure oil discharge circuit 9b to open or close the first pressure oil discharge circuit 9b. Reference numeral 11 is a variable throttle valve provided in the pressure oil inflow circuit 9a, 12 is a variable throttle valve provided in the first pressure oil discharge circuit 9b, 13 is a normally closed solenoid valve 10, and a hydraulic pump 3
It is a control device connected to an electric motor for driving the motor and other devices described later.

Numeral 14 is an opening / closing valve 5 during deceleration of the descending operation.
Is an opening adjustment diaphragm for maintaining the opening at a predetermined opening between fully open and fully closed, and an adjusting screw 14a and an adjusting screw 14a for adjusting the opening of the variable diaphragm 14c of the opening adjusting diaphragm 14.
The sleeve 14 that forms the opening of the variable throttle 14c between
b is provided. Reference numeral 15 denotes a normally closed solenoid valve, and reference numeral 16 denotes a variable adjustment throttle.

Reference numeral 30 is a first pressure detector for detecting the pressure of the first circuit 6a, and 31 is a second pressure detector for detecting the pressure of the second circuit 6b. Reference numeral 32 denotes a low speed lowering control means, which is used for the first pressure oil discharge circuit 9 by a low speed lowering command during maintenance work or the like.
While the normally closed solenoid valve 10 provided in b is deenergized, the normally closed solenoid valve 15 provided in the second pressure oil discharge circuit 9c is energized, and the opening adjustment throttle 14 functions. Lower the basket 2 at a low speed.

In the hydraulic elevator system constructed as described above, each device operates as described below when the car 2 is lowered at a low speed during maintenance work or the like. That is, when a low speed lowering command is issued from the operation control device (not shown) of the hydraulic elevator device, the normally closed solenoid valve 15 is urged by the operation of the low speed lowering control means 32 in the control device 13 to discharge the second pressure oil. The circuit 9c opens. Thereby, the pressure oil in the back chamber 5c of the on-off valve 5 is discharged to the oil tank 8, and the on-off valve 5 is gradually opened. At the moment when the on-off valve 5 opens, the pressures of the first circuit 6a and the second circuit 6b become the same.

When the opening / closing valve 5 opens, the pressure oil in the hydraulic jack 1 is pushed out by at least the weight of the car 2 and discharged to the oil tank 8 through the hydraulic jack 1, the opening / closing valve 5, the hydraulic pump 3 and the filter 7. It At this time, the pressure oil in the hydraulic jack 1 is discharged via the hydraulic pump 3 driven by the electric motor 4 by the operation of the control device 13, whereby the flow rate control of the opening / closing valve 5 is performed to bring the car 2 from the stopped state. The accelerated driving is gradually performed.

Further, the sleeve 14b of the opening adjustment diaphragm 14
The spring contacts the end surface of the on-off valve 5 on the back chamber 5c side of the valve body 5b and slides in the cylinder of the adjusting screw 14a according to the displacement of the valve body 5b. The variable diaphragm 14c is arranged on the side surface of the adjusting screw 14a, and the opening of the diaphragm formed by the variable diaphragm 14c and the sleeve 14b changes.

When the normally closed solenoid valve 15 is energized to open the second pressure oil discharge circuit 9c, and when the open / close valve 5 is closed, the variable throttle 14c is open. In this state, the pressure oil flowing from the pressure oil inflow circuit 9a into the back chamber 5c passes through the passage in the inner diameter portion of the sleeve 14b, and the variable throttle 1
After being discharged to the oil tank 8 through 4c, the on-off valve 5 gradually opens.

Further, according to the opening of the on-off valve 5, the sleeve 1
4b is also moved to gradually close the variable throttle 14c to gradually reduce the flow rate of the pressure oil. And the variable aperture 1
When 4c is closed to the closed area, the amount of pressure oil flowing into the back chamber 5c from the pressure oil inflow circuit 9a and the back chamber 5c
When the amount of pressure oil discharged to the oil tank 8 through the variable throttle 14c and the normally closed solenoid valve 15 becomes the same, the movement of the valve body 5b of the on-off valve 5 stops.

As a result, the flow rate of the oil flowing from the hydraulic jack 1 to the oil tank 8 through the valve body 5b of the on-off valve 5 and the hydraulic pump 3 becomes constant, and the low speed descending speed of the car 2 becomes constant. When the control device 13 issues a closing command for the on-off valve 5 when the car 2 reaches a predetermined floor, the normally closed solenoid valve 15 provided in the second pressure oil discharge circuit 9c is deenergized. The second pressure oil discharge circuit 9c is closed, and the opening / closing valve 5 is gradually closed completely by the operation of the variable throttle 14c.
Will gradually stop.

As described above, by the operation of the low speed lowering control means 32, the opening of the car 2 becomes smaller during the low speed lowering operation of the car 2 than during the high speed lowering operation, that is, during the normal lowering operation. Will descend at the required low speed. In addition, even if the power is cut off during low-speed descent, the car 2 can be stopped immediately without increasing the speed, an unexpected accident can be prevented, and safety can be improved. it can.
Further, the low speed lowering operation can be performed via the opening / closing valve 5 for the high speed descending operation, that is, the normal lowering operation. Therefore, the car 2 can be driven at a low speed at a low speed by a simple control by a device having a simple structure with a small number of parts, and the manufacturing cost can be reduced.

Further, in the low speed descent operation of the car 2, the hydraulic oil in the hydraulic jack 1 is discharged via the hydraulic pump 3, and the flow control of the opening / closing valve 5 allows the acceleration running from the stopped state of the car 2. It is done gradually. Further, in the deceleration of the car 2 during the low speed descending operation, the opening / closing valve 5 is gradually fully closed by the operation of the variable throttle 14c, and the car 2 is gradually stopped.
Therefore, it is possible to improve the safety of the car 2 during the low speed descent operation.

Embodiment 2 FIG. 2 is a diagram showing an example of another embodiment of the present invention, and is a graph showing operating characteristics. Note that, also in the second embodiment, the hydraulic elevator device is configured similarly to the above-described FIG. In the figure, FIG. 2 (a) is a graph of the descending velocity line (vertical axis) of the car 2 against time (horizontal axis), and FIG. 2 (b) is provided in the second pressure oil discharge circuit 9c with respect to time (horizontal axis). Normally closed solenoid valve 1
5 operation timing graph, FIG. 2 (c) is a graph of the opening / closing valve 5 opening (vertical axis) against time (horizontal axis), and FIG. 2 (d) is the first circuit 6a and the second circuit against time (horizontal axis). It is a graph of the pressure of 6b (vertical axis).

In this embodiment, assuming that the car 2 is now driven at a low speed, each device operates as described below. That is, when a low speed lowering command is issued from the operation control device (not shown) of the hydraulic elevator device, the normally closed solenoid valve 15 is urged by the operation of the low speed lowering control means 32 in the control device 13 to discharge the second pressure oil. Circuit 9c
Opens. As a result, the pressure oil in the back chamber 5c of the on-off valve 5 is discharged to the oil tank 8 and the on-off valve 5 gradually opens. At the moment when the on-off valve 5 opens, the pressures of the first circuit 6a and the second circuit 6b are the same. become.

Then, as shown in FIG. 2 (d), the rotation speed of the hydraulic pump 3 is controlled by the electric motor 4 to drive the first circuit 6a.
The pressure of is maintained at a predetermined value. Further, as shown in FIG. 2 (d), when the load in the car 2 changes, the pressure in the second circuit 6b changes, but the rotation speed of the hydraulic pump 3 is controlled by the electric motor 4 and the value of the first circuit 6a is changed. Maintains a constant value. Then, the control for maintaining the pressure value of the first circuit 6a constant is continued until the car 2 stops.

As described above, the low speed lowering operation can be controlled by controlling the flow rate of the opening / closing valve 5, and the low speed lowering operation control by the regenerative braking of the electric motor 4 is not performed. Therefore, even if the power is cut off during low-speed descent traveling, the car 2 can be stopped immediately without increasing the speed, accidents can be prevented, and safety can be improved. You can

Embodiment 3 FIG. 3 is also a diagram showing an example of another embodiment of the present invention, and is a flow chart for explaining an operating condition. Note that, also in the third embodiment, the hydraulic elevator device is configured similarly to the above-described FIG. In the figure, if the car 2 is now operated to descend at a low speed, a low speed descending command is issued in step 101 from an operation controller (not shown) of the hydraulic elevator system, and the operation of the low speed descending control means 32 in the controller 13 is performed. In step 102, the normally closed solenoid valve 15 is energized.

As a result, the passage of the on-off valve 5 is opened in step 103, the car 2 starts running in step 104, the second pressure oil discharge circuit 9c is opened at this time, and the pressure is applied to the first circuit 6a. Oil flows in. And step 10
5, the pressure is detected by the first pressure detector 30, the process proceeds to step 106, and the rotational speed control of the hydraulic pump 3 is started.

Next, in step 107, the first circuit 6
If the pressure of a is not within the predetermined value range, the process proceeds to step 108, and if it is within the predetermined value range, the process proceeds to step 109. If no stop command is issued in step 109, step 110
If so, proceed to step 112 described later. In step 110, the valve body 5b of the on-off valve 5 is gradually opened and the car 2 accelerates. Next, the process proceeds to step 111, and if the stop command is not issued, the process returns to step 107, and if it is issued, the process proceeds to step 112.

In step 112, the valve body 5b of the opening / closing valve 5 is gradually closed and the car 2 is decelerated. And step 1
Go to 13 and step 1 if car 2 is not stopped
Return to 07. If the pressure of the first circuit 6a is equal to or higher than the predetermined value in step 108, the process proceeds to step 114, and the rotational speed of the hydraulic pump 3 in the direction of flowing the pressure oil from the first circuit 6a to the oil tank 8 is increased.

If the pressure of the first circuit 6a is less than the predetermined value in step 108, the process proceeds to step 115, and the hydraulic pump 3 in the direction of flowing the pressure oil from the first circuit 6a to the oil tank 8 is reached.
Reduce the rotation speed of. Next, the routine proceeds to step 116, and if it is within a predetermined time from the start of the rotation speed control of the hydraulic pump 3, the routine returns to step 107, and if it is not within the predetermined time, the routine proceeds to step 117 to stop the operation of the electric motor 4.

In summary, when the car 2 is driven at a low speed, the operation of the low speed lowering control means 32 issues a low speed lowering command to urge the normally closed solenoid valve 15. As a result, the passage of the opening / closing valve 5 is opened and the car 2 starts traveling, and at this time, the pressure oil flows into the first circuit 6a.
The rotation speed of the hydraulic pump 3 is not controlled until the pressure is detected by the first pressure detector 30, and the operation after the control of the rotation speed of the hydraulic pump 3 is performed after the operation of the first pressure detector 30, that is, Step 114 or Step 11
It is designed to proceed to 5.

As a result, the hydraulic pump 3 does not start rotating before the opening / closing valve 5 opens, and the first circuit 6a has a negative pressure,
That is, it is possible to prevent the pressure from becoming lower than the atmospheric pressure. Then, it is possible to solve the problem caused by the negative pressure in the first circuit 6a.

Embodiment 4 An example of another embodiment of the present invention will be described with reference to FIGS. After a lapse of a predetermined time from the start of the rotation speed control of the hydraulic pump 3 in step 106 in FIG. 3, the pressure of the first circuit 6a is detected by the first pressure detector 30. Then, it is determined whether the pressure of the first circuit 6a is within a predetermined value range, and if it is within the predetermined value range, regular traveling control is performed. Further, when the pressure of the first circuit 6a is out of the predetermined value range, the rotation speed of the hydraulic pump 3 in the direction in which the pressure oil flows from the first circuit 6a to the oil tank 8 is increased or decreased, whereby the first circuit 6a The pressure is controlled to fall within a predetermined value range.

However, when the pressure in the first circuit 6a is out of the predetermined value range, from the start of the control for increasing or decreasing the rotational speed of the hydraulic pump 3 in the direction of flowing the pressure oil from the first circuit 6a to the oil tank 8, When the pressure in the first circuit 6a does not fall within the predetermined value range within a predetermined time, the operation of the electric motor 4 is stopped by the operation of the low speed descent control means 32. Therefore, when some abnormality occurs in the device, it is possible to prevent occurrence of an accident due to continued operation in an abnormal state, and it is possible to improve safety.

[0058]

As described above, according to the present invention, the rotation speed of the electric motor for driving the hydraulic pump for pumping the pressure oil to the hydraulic jack is changed to change the discharge flow rate of the hydraulic pump so that the hydraulic jack is engaged. Installed between the hydraulic jack and the hydraulic pump, and a control device that controls the car's ascending operation and changes the rotation speed of the electric motor to control the discharge flow rate of pressure oil in the hydraulic jack to control the car's descending operation. The open / close valve that opens when the car is running and closes when the car is stopped, and the low speed descent control means that makes the opening of the open / close valve during the low speed descent operation smaller than during the normal descent operation. It is provided.

Thus, by the operation of the low speed descending control means, the opening degree of the car during the low speed descending operation becomes smaller than the opening degree of the opening / closing valve during the high speed descending operation, that is, the normal descending operation. Therefore, even if the power is shut off during low-speed descent, the car can be stopped immediately without increasing speed,
The occurrence of unexpected accidents can be prevented in advance, which has the effect of improving safety. In addition, since it is possible to perform the low speed operation of the descending operation through the on-off valve for the high speed operation of the descending operation, that is, the normal descending operation, the low speed operation of the car can be performed at a low speed by the simple control by the device having the simple configuration with the small number of parts. It is possible to reduce the production cost.

As described above, according to the present invention, the pressure oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. In addition, the low-speed lowering control means for stopping the car in the low-speed lowering operation by the flow rate control by gradually closing the opening / closing valve is provided.

Thus, by the operation of the low speed descending control means, the opening degree of the car during the low speed descending operation is smaller than the opening degree of the opening / closing valve during the high speed descending operation, that is, the normal descending operation. Therefore, even if the power is shut off during low-speed descent, the car can be stopped immediately without increasing speed,
The occurrence of unexpected accidents can be prevented in advance, which has the effect of improving safety.

Further, since the low speed operation of the descending operation can be performed through the opening / closing valve for the high speed operation of the descending operation, that is, the normal lowering operation, the low speed operation of the car can be performed by the simple control by the device having the small number of parts. The descending operation becomes possible, which has the effect of reducing the manufacturing cost. Further, in the low speed descent operation of the car, the car is gradually accelerated and gradually decelerated and stopped, so that there is an effect of improving the safety during the low speed descent operation.

Further, as described above, according to the present invention, the pressure oil in the hydraulic jack is discharged via the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. Also, during low speed descent operation, the car is stopped by the flow control by gradually closing the opening / closing valve, and even if the pressure between the hydraulic jack and the opening / closing valve changes, the hydraulic pump and opening / closing are controlled by the electric motor of the hydraulic pump. A low speed lowering control means for controlling the pressure between the valves within a predetermined value is provided.

As a result, due to the operation of the low speed lowering control means, the opening degree of the car during the low speed lowering operation becomes smaller than the opening degree of the opening / closing valve during the high speed lowering operation, that is, the normal lowering operation. Therefore, even if the power is shut off during low-speed descent, the car can be stopped immediately without increasing speed,
The occurrence of unexpected accidents can be prevented in advance, which has the effect of improving safety.

Further, since the descending low speed operation can be performed through the opening / closing valve for the descending high speed operation, that is, the normal descending operation, the car can be operated at a low speed by the simple control by the device having a small number of parts. The descending operation becomes possible, which has the effect of reducing the manufacturing cost. Furthermore, it is possible to control the low speed descent operation by controlling the flow rate of the open / close valve, and even if the power is cut off during the low speed descent traveling, the car can be stopped immediately without increasing the speed and an unexpected accident occurs. Can be prevented and safety can be improved.

As described above, according to the present invention, the pressure oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. Also, during low speed descent operation, the car is stopped by the flow control by gradually closing the opening / closing valve, and after the pressure due to the pressure oil is generated between the hydraulic pump and the opening / closing valve, the pressure oil of the hydraulic jack is opened / closed. And a low speed descending control means for starting the operation of the hydraulic pump in the direction of discharging through the hydraulic pump.

Thus, by the operation of the low speed descending control means, the opening degree of the car during the low speed descending operation is smaller than the opening degree of the opening / closing valve during the high speed descending operation, that is, the normal descending operation. Therefore, even if the power is shut off during low-speed descent, the car can be stopped immediately without increasing speed,
The occurrence of unexpected accidents can be prevented in advance, which has the effect of improving safety.

Further, since the descending low speed operation can be performed through the opening / closing valve for the descending high speed operation, that is, the normal descending operation, the low speed of the car can be achieved by the simple control by the device having the small number of parts and the simple structure. The descending operation becomes possible, which has the effect of reducing the manufacturing cost. Further, since the hydraulic pump is operated after the pressure of the hydraulic oil is generated between the hydraulic pump and the on-off valve, the hydraulic pump does not rotate before the on-off valve opens, and the negative pressure is generated between the hydraulic pump and the on-off valve. There is an effect of eliminating a problem caused by a negative pressure without being a pressure.

As described above, according to the present invention, the pressure oil in the hydraulic jack is discharged via the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow control of the opening / closing valve. In addition, during low speed descent operation, the car is stopped by the flow control by gradually closing the opening / closing valve, and when the pressure between the hydraulic pump and the opening / closing valve is out of the predetermined value range, Between the hydraulic pump and the opening / closing valve within a predetermined time after the start of the control to increase / decrease the rotational speed of the hydraulic pump in the direction of discharging the pressure oil from the interval. A low speed descent control means for stopping the operation of the electric motor is provided.

Thus, by the operation of the low speed lowering control means, the opening degree of the opening / closing valve during the low speed lowering operation of the car becomes smaller than that during the high speed lowering operation, that is, during the normal lowering operation. Therefore, even if the power is shut off during low-speed descent, the car can be stopped immediately without increasing speed,
The occurrence of unexpected accidents can be prevented in advance, which has the effect of improving safety. Further, since the low speed operation of the descending operation can be performed through the on-off valve for the high speed operation of the descending operation, that is, the normal descending operation, the low speed operation of the car can be performed at a lower speed than the simple control by the device having a simple structure with a small number of parts. It is possible to reduce the production cost.

Further, when the pressure between the hydraulic pump and the on-off valve is outside the predetermined value range, within a predetermined time after the start of the control for increasing or decreasing the rotational speed of the hydraulic pump in the direction of discharging the pressure oil, When the pressure does not fall within the predetermined value range, the operation of the electric motor of the hydraulic pump is stopped. Therefore, there is an effect of preventing an accident from occurring due to the continuation of the operation in the abnormal state and improving the safety.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention and is a graph showing operating characteristics.

FIG. 3 is a diagram showing a third embodiment of the present invention and is a flowchart for explaining an operating condition.

FIG. 4 is a hydraulic circuit diagram showing a conventional hydraulic elevator device.

[Explanation of symbols]

1 hydraulic jack, 2 car, 3 hydraulic pump, 4 electric motor, 5 on-off valve, 13 control device, 32 low speed descent control means.

Claims (5)

[Claims] 1. A raising operation of a car engaged with the hydraulic jack is controlled by changing a rotation speed of an electric motor that drives a hydraulic pump that feeds pressure oil to the hydraulic jack to change a discharge flow rate of the hydraulic pump. However, the rotation speed of the electric motor is changed to control the discharge flow rate of the pressure oil in the hydraulic jack to control the lowering operation of the car, and the control device is provided between the hydraulic jack and the hydraulic pump. An opening / closing valve that opens when the car is traveling and that closes when the car is stopped, and a low-speed lowering control means that makes the opening of the opening / closing valve during the low-speed lowering operation smaller than during the normal lowering operation Hydraulic elevator equipment. 2. The low-pressure descent operation causes the hydraulic oil in the hydraulic jack to be discharged through the hydraulic pump, and the car in the stopped state is gradually accelerated by the flow rate control of the opening / closing valve. 2. The hydraulic elevator apparatus according to claim 1, wherein the car is a low speed descending control means for stopping the car by controlling the flow rate by gradually closing the opening / closing valve. 3. The low pressure oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow rate control of the opening / closing valve. The car is stopped by the flow rate control by gradually closing the on-off valve, and even if the pressure between the hydraulic jack and the on-off valve changes, the electric motor of the hydraulic pump controls the car so that the pressure between the hydraulic pump and the on-off valve is reduced. The hydraulic elevator device according to claim 1, wherein the hydraulic elevator device is a low speed lowering control means for controlling the pressure within a predetermined value. 4. The low pressure descent operation causes the hydraulic oil in the hydraulic jack to be discharged through the hydraulic pump, and the car in a stopped state is gradually accelerated by the flow rate control of the opening / closing valve. The car is stopped by the flow rate control by gradually closing the on-off valve, and after the pressure of the pressure oil 6 is generated between the hydraulic pump and the on-off valve, the pressure oil of the hydraulic jack is changed to the on-off valve and the oil pressure. 2. The hydraulic elevator apparatus according to claim 1, wherein the hydraulic elevator device is a low speed descending control means for starting the operation of the hydraulic pump in a direction of discharging through the pump. 5. The hydraulic oil in the hydraulic jack is discharged through the hydraulic pump during the low speed descent operation, and the stopped car is gradually accelerated by the flow rate control of the opening / closing valve. When the car is stopped by the flow rate control by gradually closing the opening / closing valve and the pressure between the hydraulic pump and the opening / closing valve is out of the predetermined value range, pressure oil is discharged from between the hydraulic pump and the opening / closing valve. When the pressure between the hydraulic pump and the on-off valve does not fall within the predetermined value range within a predetermined time after the start of the control for increasing or decreasing the rotational speed of the hydraulic pump in the discharging direction, the electric motor of the hydraulic pump is 2. The hydraulic elevator apparatus according to claim 1, wherein the hydraulic elevator apparatus is a low speed descending control means for stopping the operation.