JPH08310741A - Oil temperature rise operating device for hydraulic elevator - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the repetition of the oil temperature increasing operation and the low speed increasing operation for landing level correction when a problem occurs that the car descends during the oil temperature increasing operation of the hydraulic elevator. . [Structure] When the oil temperature decreases, the hydraulic pump 3 is operated to pass oil through the third main circuit 20 and the third opening / closing valve 24.
The oil temperature rise operation is carried out. If the second on-off valve 19 has a poor closing condition during the oil temperature increasing operation, the pressure oil of the hydraulic jack 1 is changed from the second main circuit 18 to the second on-off valve 19 to the third main circuit 20 to the third on-off valve 24. Flow to oil tank 8 and basket 2
Descends. When the lowering of the car 2 occurs, the third opening / closing valve 24 is closed to stop the car 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling a hydraulic elevator that operates to raise an oil temperature.

[0002]

2. Description of the Related Art FIG. 1 is a hydraulic circuit diagram showing a conventional hydraulic elevator system disclosed in, for example, Japanese Patent Laid-Open No. 5-286670. In the figure, 1 is a hydraulic jack for driving the plunger 1a, 2 is a basket connected to the plunger 1a, 3 is a hydraulic pump capable of reversible rotation, and 4 is a hydraulic pump 3.
Is an electric motor that drives.

Reference numeral 5 denotes a main chamber 5a and a main chamber 5 through a valve body 5b.
The main chamber 5a is connected between the hydraulic jack 1 and the hydraulic pump 3 by the first on-off valve having the back chamber 5c isolated from the valve body 5a, and the valve body 5b is opened by the inflow / outflow of the pressure oil in the back chamber 5c. It is operated to open and close the hydraulic flow path between the hydraulic jack 1 and the hydraulic pump 3, open when the car 2 is descending, and close when the car 2 is stopped. 6 is the first
A first circuit 6a for connecting the on-off valve 5 and the hydraulic pump 3 and a first main circuit 7 for hydraulic pressure composed of a second circuit 6b for connecting the hydraulic jack 1 and the first on-off valve 5, 7 was connected to the hydraulic pump 3. The filter, 8 is an oil tank.

Reference numeral 9 is a pilot circuit composed of a pressure oil inflow circuit 9a connecting the hydraulic jack 1 and the back chamber 5c of the first on-off valve 5 and a pressure oil discharge circuit 9b connecting the back chamber 5c and the oil tank 8, and 9c is A pressure oil discharge circuit that connects the variable throttle 15c to be described later and the oil tank 8 is provided, 11 is a normally closed solenoid valve that is provided in the pressure oil discharge circuit 9b and opens or closes the flow path, and 12 is provided in the pressure oil inflow circuit 9a. The variable throttle valve 13 is a variable throttle valve provided in the pressure oil discharge circuit 9b.

Reference numeral 15 denotes a car 2 in the descending operation of the descending operation,
An opening adjustment throttle that allows the plunger 1a to be held at a predetermined opening between the fully open and closed positions of the first opening / closing valve 5. Reference numeral 15a denotes an opening for adjusting a variable throttle 15c of the opening adjustment throttle 15. The adjusting screw, 15b is connected to the valve body 5a and the adjusting screw 1
5a is a sleeve that forms the opening of the variable throttle 15c, 16 is a normally closed solenoid valve provided in the pressure oil discharge circuit 9c, and 17 is a variable throttle valve provided in the pressure oil discharge circuit 9c.

Reference numeral 18 denotes a first circuit 18a connecting the hydraulic pump 3 and the second opening / closing valve 19, a first opening / closing valve 5 and a second opening / closing valve 1.
In the second main circuit of hydraulic pressure composed of the second circuit 18b connecting the first and second valves 9, the second opening / closing valve 19 is associated with the main chamber 19a, the valve body 19b, the back chamber 19c communicating with the main chamber 19a, and the valve body 19b. A mating piston 19d, a compression coil spring 19e provided between the piston 19d and the valve body 19b, and a piston 19d.
And a back chamber 19f located at the rear of the piston, and the compression coil spring 19e presses the piston 19d and the valve body 19b against each other. 19g is a stopper of the piston 19d.

Reference numeral 20 designates a third hydraulic main circuit comprising a first circuit 20a connecting the hydraulic pump 3 and the third opening / closing valve 21 and a second circuit 20b connecting the third opening / closing valve 24 and the oil tank 8,
Is a pilot circuit 21a for connecting the hydraulic jack 1 and the back chamber 19f and a pilot circuit 21b for connecting the back chamber 19f and the third main circuit 20. Reference numeral 22 is a normally closed electromagnetic circuit provided in the pilot circuit 21. Valve, 2
3A is a hydraulic jack 1 provided in the pilot circuit 21a
Throttle for adjusting the amount of pressure oil flowing into the back chamber 19f from the
B is a throttle for adjusting the outflow amount of the pressure oil from the back chamber 19f.

The third on-off valve 24 includes a main chamber 24a and a valve body 24.
The back chamber 24c is separated from the main chamber 24a via b, and the compression coil spring 24d for pressing the valve body 24b is provided.
The valve body 24b is operated by the inflow and outflow of the pressure oil in 4c to open and close the third main circuit 20. Reference numeral 24e is a blocking mechanism that is provided in the third opening / closing valve 24 via a screw mechanism to restrict the moving position of the valve body 24b when the valve body 24b opens the third main circuit 20, and 24f is the same as the third opening / closing valve 24. This is a blocking mechanism that regulates the movement position of the valve element 24b so that it does not open more than a predetermined value.

Reference numeral 25 is a pilot circuit connecting the third main circuit 20 and the back chamber 24c of the third on-off valve 24, 26 is a throttle for providing passage resistance to the pilot circuit 25, and 27 is a back chamber 24c of the third on-off valve 24. A pilot circuit connecting the oil tank 8,
28 is a normally closed solenoid valve for heating provided in the pilot circuit 24, and 29 is a pressure oil flowing from the hydraulic pump 3 to the second and third opening / closing valves 19 and 24, but not flowing in the opposite direction. Check valve, 30 is third opening / closing valve 24, heating solenoid valve 25
And the like, 31 is a speed detector for detecting the speed and position of the car 2, 32 is the electric motor 4, the speed detector 31, the heating control means 30, and the solenoid valves 11, 16, 22,
28 is a control device connected to.

The conventional hydraulic elevator system is constructed as described above, and its operation will be described for the ascending operation of the car 2. When the ascending operation command is issued, the controller 32 operates the electric motor 4 and controls the rotation speed thereof. With this, the hydraulic pump 3 is driven, and the first main circuit 18 of the first main circuit 18 is driven.
The hydraulic pressure of the circuit 18a rises. Then, the first circuit 18a
Is the pressure of the second circuit 18b and the compression coil spring 19e.
When this force is overcome, the valve body 19b moves and the second opening / closing valve 19 opens.

Then, the pressure oil flows into the hydraulic jack 1 from the first circuit 18a via the second circuit 18b and the main chamber 5a of the first opening / closing valve 5, and the car 2 starts to rise. Then, as the rotation speed of the electric motor 4 increases, the car 2 accelerates and travels, and the valve body 19 moves with the flow rate of the second opening / closing valve 19.
The opening of b increases. When the speed of the car 2 reaches the rated speed, the rotation speed of the electric motor 4 becomes constant and the flow rate discharged from the hydraulic pump 3 also becomes constant.

When the car 2 reaches a predetermined distance before the floor to be stopped and a deceleration command is issued after the deceleration traveling of the ascending operation is started, the electric motor 4 is controlled by the control device 32 and the rotation speed thereof is reduced. As a result, the car 2 decelerates, the flow rate passing through the valve body 19b also decreases, the opening degree of the valve body 19b becomes smaller, and when the car 2 arrives at the landing position on the scheduled stop floor, the valve body 19b Completely closes, and the electric motor 4 stops operating.

Next, when a descending operation command is issued while the car 2 is landing, the controller 32 operates the electric motor 4 to control the rotation speed thereof. As a result, the hydraulic pump 3 is driven and the hydraulic pressure of the first circuit 6a of the first main circuit 6 rises.
Then, when it is detected (not shown) that the pressure of the first circuit 6a becomes substantially the same as the pressure of the second circuit 6b, the solenoid valve 11 is energized by the control device 32 and the pressure oil discharge circuit 9b. Opens.

As a result, the pressure oil in the back chamber 5c of the first on-off valve 5 is discharged to the oil tank 8 and the valve body 5b moves to move the first on-off valve 5
Opens. After the opening of the first opening / closing valve 5 is started, the pressure oil in the hydraulic jack 1 is pushed out by the own weight of the car 2, and the hydraulic jack 1 → the first opening / closing valve 5 → the hydraulic pump 3 → the filter 7
And then discharged to the oil tank 8. At this time, the electric motor 4 is driven by the control device 32, and the hydraulic pump 3 discharges the pressure oil in the hydraulic jack 1.

In this way, the electric motor 4 connected to the hydraulic pump 3 is driven by the dynamic braking by the pressure in the hydraulic jack 1 generated by the weight of the car 2 and the flow rate discharged from the hydraulic jack 1. Therefore, by controlling the rotation speed of the electric motor 4 by the control device 32, the car 2 descends according to a predetermined operation pattern. Here, when an acceleration traveling command for descending operation is issued, the control device 32 causes the solenoid valve 11 to operate.
Is urged to open the pressure oil discharge circuit 9b. As a result, the first on-off valve 5 increases as the speed during acceleration increases.
By adjusting the opening degree of the variable throttle 13 in advance so as to gradually increase the opening degree, it is possible to adjust the time from when the first opening / closing valve 5 is fully closed to when it is fully opened.

In addition, after the deceleration of the descending operation is started, the car 2
When the vehicle reaches a predetermined distance before the scheduled stop floor, the control device 32
As a result, a closing command is issued to the first opening / closing valve 5, and the solenoid valve 11 is deenergized. This closes the pressure oil discharge circuit 9b. At the same time, the solenoid valve 16 is energized. At this time, since the variable throttle 15c of the opening adjustment throttle 15 is fully closed, the pressure oil discharge circuit 9
c is not in communication. Thus, the opening of the variable throttle 12 of the pressure oil inflow circuit 9a is adjusted in advance so that the opening of the first opening / closing valve 5 is gradually decreased as the speed of the car 2 during deceleration travel decreases. deep. With this, the first on-off valve 5
You can adjust the closing time.

As the opening degree of the first on-off valve 5 gradually decreases, the sleeve 15b of the opening degree adjusting throttle 15 follows and moves, the variable throttle 15c gradually opens, and the pressure oil discharge circuit 9c.
Communicate with each other. When the opening amount of the variable throttle 15c becomes such that the inflow amount of the hydraulic oil from the pressure oil inflow circuit 9a and the discharge amount of the hydraulic oil from the pressure oil discharge circuit 9c match, the first opening / closing valve 5 is partially opened. Stop at a time. After that, when the solenoid valve 16 is deenergized, the pressure oil discharge circuit 9c is closed, and the discharge amount of the hydraulic oil is lost, so that the hydraulic oil from the pressure oil inflow circuit 9a enters the back chamber 5c of the first opening / closing valve 5. Inflow, the first on-off valve 5 is gradually closed and then fully closed.

Next, when a low speed operation descent command is issued, the solenoid valve 28 is energized and the third valve is passed through the pilot circuit 27.
Oil is discharged from the back chamber 24c of the on-off valve 24 to the oil tank 8. Only by energizing the solenoid valve 28, the third opening / closing valve 24 does not open because the valve body 24b is pressed by the compression coil spring 24d. After the passage of the solenoid valve 28 is completely opened, the solenoid valve 22 is energized. As a result, the pilot circuit 2
The back chamber 19 of the second opening / closing valve 19 through 1b and the throttle 23B.
The pressure oil is discharged from f to the third main circuit 20, and the piston 19
Since d is moved away from the stopper 19g by the force of the compression coil spring 19e, the piston 19d and the valve body 19b are engaged and move integrally.

Thus, the pressure oil of the hydraulic jack 1 flows to the third main circuit 20 through the second main circuit 18 and the second opening / closing valve 24. Therefore, the valve element 24b of the third on-off valve 24 is pushed by the pressure, overcomes the force of the compression coil spring 24d and moves, and the third on-off valve 24 opens. The opening area of the third on-off valve 24 at this time corresponds to the passing flow rate. Therefore, the acceleration time can be adjusted by adjusting the aperture area of the diaphragm 23B. By gradually opening the second opening / closing valve 19, the flow rate from the hydraulic jack 1 through the second opening / closing valve 19 to the third main circuit 20 increases, and the car 2 accelerates.

When a stop command for low speed operation is issued, the solenoid valve 22
Is deenergized, and pressure oil is no longer discharged from the back chamber 19f of the second opening / closing valve 19 to the third main circuit 20. As a result, pressure oil flows from the hydraulic jack 1 into the back chamber 19f through the pilot circuit 21a and the throttle 23A, so that the piston 19d and the valve body 19b move integrally and gradually pass through the passage to the second main circuit 18. Shut it down. Therefore, the flow rate from the hydraulic jack 1 through the second opening / closing valve 19 to the third main circuit 20 decreases, and the car 2 decelerates. Therefore, the travel time can be adjusted by adjusting the opening area of the diaphragm 23A.

The opening area of the third on-off valve 24 corresponds to the flow rate passing through, but the car 2 stops and the hydraulic jack 1
There is a slight delay time until the valve is fully closed even if there is no flow rate from the third main circuit 20 to the third main circuit 20. Therefore, the solenoid valve 28 is deenergized a predetermined time after the solenoid valve 22 is deenergized so that the time until the third opening / closing valve 24 is fully closed is secured. That is, when the solenoid valve 28 is energized,
The valve body 24b is pushed in the closing direction by the force of the compression coil spring 24d, and passes through the pilot circuit 27 from the oil tank to the back chamber 2.
4c and oil through the pilot circuit 25 into the back chamber 24c. As a result, the time from when the second opening / closing valve 19 is fully closed to when the third opening / closing valve 24 is fully closed can be shortened.

In the hydraulic elevator, when the oil temperature in the hydraulic circuit decreases, the viscosity of the oil increases, so that the operating efficiency of the hydraulic pump 3 decreases. In addition, passage resistance when oil flows through the pipeline increases, energy consumption increases, and the flow rate of oil flowing through the pilot circuit that drives the flow control valve and pressure control valve decreases compared to normal temperature. Therefore, the control characteristic of the control valve changes. Therefore, it is necessary to prevent the oil temperature from falling below a predetermined value.

The third on-off valve 24 is a heating on-off valve provided to prevent the oil temperature from falling below a predetermined value.
The pressure oil discharged from the hydraulic pump 3 is applied to the oil tank 8 while the pressure oil is being applied, and the frictional heat generated there is applied to the oil to raise the oil temperature. That is, when an oil temperature detector (not shown) provided in the oil tank 8 detects that the oil temperature is below a predetermined value, the solenoid valve 28 is energized to enable the pressure oil to flow. , Drive the electric motor 4 to operate the hydraulic pump 3.

The pressure oil is now supplied from the first circuit 20a of the third main circuit 20 to the main chamber 24a of the third opening / closing valve 24 and the second circuit 2
After passing through 0b, the oil temperature rises and the oil temperature rises. At this time, the electric motor 4 rotates at a predetermined constant rotation speed. When the oil temperature rises and exceeds a predetermined value, the electric motor 4 stops operating, the valve body 24b moves by the force of the compression coil spring 24d, and the third opening / closing valve 21 is fully closed. Then, the solenoid valve 28 is deenergized. As described above, the third opening / closing valve 24 is in the fully closed state during the normal operation of the car 2, and during the oil temperature increasing operation, it is opened by the amount determined by the adjustment of the blocking mechanism 24e, and the oil temperature increasing operation ends. Then, the closed state is restored again.

[0025]

In the conventional oil temperature rising operating device for a hydraulic elevator as described above, the first circuit 1 on the hydraulic pump 3 side of the second main circuit 18 is operated during the oil temperature rising operation.
The pressure of 8a is adjusted to be lower than the pressure of the second circuit 18b on the hydraulic jack 1 side. Therefore, during the oil temperature increasing operation, if the valve body 19b of the second opening / closing valve 19 is not seated and the passage of the second main circuit 18 is opened, the hydraulic jack 1 to the second main circuit 18, Since the pressure oil flows out through the path of the second opening / closing valve 19, the third opening / closing valve 24, and the oil tank 8, the car 2 is lowered.

When the car 2 descends and reaches a predetermined position, the oil temperature increasing operation is stopped and the low speed increasing operation for correcting the floor level is executed. When the position of car 2 is corrected,
Since the oil temperature increasing operation is started again, the same behavior of the car 2 as described above is repeated. If this state is repeated for a long time, the temperature of the electric motor 4 will rise abnormally, and there is a problem that the electric motor 4 may be burned out.

The present invention has been made to solve the above problems. Even when the second on-off valve is in an insufficiently closed state, the oil temperature increasing operation and the low speed increasing operation for level correction are repeated. An object of the present invention is to provide an oil temperature rising operation device for a hydraulic elevator, which is capable of preventing the oil from rising.

[0028]

According to a first aspect of the present invention, an oil temperature rising operating device for a hydraulic elevator detects an oil temperature rise when it is detected that a car has been lowered during operation of an electric motor according to an oil temperature raising operation command. The oil temperature increasing operation stopping means for stopping the increasing operation is provided.

Further, an oil temperature rising operation device for a hydraulic elevator according to a second aspect of the present invention is the same as that of the first invention, wherein the oil temperature raising operation stopping means is provided to perform the oil temperature raising operation when the car lowering speed becomes equal to or higher than a predetermined speed. It is configured to stop.

Further, an oil temperature raising operation device for a hydraulic elevator according to a third aspect of the present invention is the one according to the first aspect, wherein the oil temperature raising operation stopping means stops the oil temperature raising operation when the car descends to a predetermined position. It is what

Further, an oil temperature rising operation device for a hydraulic elevator according to a fourth aspect of the present invention is the same as that of the first invention, wherein after the oil temperature raising operation stopping means is operated, the car is raised at a low speed.
Then, a floor-matching operation means for performing a descending floor-matching operation is provided.

[0032]

In the first invention of the present invention, when the car descends during the oil temperature increasing operation, in the second invention, when the descending speed of the car becomes a predetermined speed or more, and in the third invention, the car When the oil temperature is raised to a predetermined position, the oil temperature raising operation is stopped, so that there is no pressurized oil flowing from the hydraulic jack to the oil tank through the second opening / closing valve and the third opening / closing valve.

Further, in the fourth aspect of the invention, after the third on-off valve is closed, the car is operated to move up at a low speed and then to the descending floor-matching operation. Opens and closes.

[0034]

【Example】

Example 1. 1 and 2 are views showing an embodiment of the first to third inventions of the present invention, FIG. 1 is a hydraulic circuit diagram, and FIG. 2 is an operation flowchart.

Next, the operation of this embodiment will be described. In this embodiment as well, the basic operation of the normal operation of the car 2 and the basic operation of the oil temperature increasing operation are the same as those of the conventional apparatus. The control operation will be described with reference to FIG. When it is detected in step 41 that the oil temperature has become equal to or lower than the predetermined value A, in step 42 the oil temperature increasing operation is commanded. In step 43, the solenoid valve 28 for heating is energized to allow the pressure oil to flow, and in step 44, the electric motor 4 is driven to operate the hydraulic pump 3.

At step 45, it is judged from the output of the speed detector 31 whether the car 2 is descending at a predetermined speed or more, or is not descending to a predetermined position. If this condition is satisfied, the routine proceeds to step 46, where the above-mentioned oil temperature increasing operation is carried out. In step 47, it is determined whether the oil temperature is equal to or higher than the predetermined value B. If the oil temperature is lower than the predetermined value B, the process returns to step 43 to continue the oil temperature increasing operation. When it is determined in step 47 that the oil temperature has become equal to or higher than the predetermined value B, the oil temperature increasing operation is ended. If it is determined in step 45 that the car 2 is descending at a predetermined speed or more, or if it is descending to a predetermined position, the third opening / closing valve 24 is immediately closed to end the oil temperature increasing operation. At this time, the third on-off valve may be closed after the operation of the electric motor 4 is stopped. Here, step 45 constitutes a temperature rising operation stopping means.

Thus, when the car 2 is descending at a predetermined speed or more or descending to a predetermined position during the oil temperature increasing operation, the third opening / closing valve 24 is closed and the hydraulic jack 1 is removed. Since the pressure oil flowing out to the oil tank 8 through the second opening / closing valve 19 and the third opening / closing valve 24 is blocked, the car 2 does not descend.

Example 2. FIG. 3 is an operation flowchart showing an embodiment of the fourth invention of the present invention, and the same parts as those in the embodiment 1 are designated by the same reference numerals. Note that FIG. 1 is also used in the second embodiment. Next, the operation of this embodiment will be described with reference to FIG. Since FIG. 3 is similar to FIG. 2, differences will be mainly described.

In steps 41 to 44, the electric motor 4 is driven by the oil temperature increasing operation command as in FIG. Step 51
Determining whether the car 2 is descending at a predetermined speed or more,
If not descending at a predetermined speed or more, steps 46 and 4
7, the oil temperature increasing operation is continued as in FIG. When it is determined in step 51 that the car 2 is descending at a predetermined speed or more, the third opening / closing valve 24 is closed in step 52 to stop the oil temperature increasing operation. At this time, the third on-off valve 24 may be closed after the operation of the electric motor 4 is stopped.

In step 53, the car 2 is driven at a low speed until it goes out of the landing level range. In step 54, a low speed descent operation is performed within the landing level range, the flow returns to step 42, and the oil temperature increasing operation is started again. Here, steps 53 and 54
Constitutes the floor alignment operation means.

In this way, the oil temperature raising operation is once stopped, the low speed raising operation is performed, and then the lowering floor alignment operation is performed, whereby the second opening / closing valve 19 is opened and then closed, and the valve body 19b is opened for some reason. It is possible to return it to its normal position even when it is not seated on the valve seat. This can prevent the oil temperature increasing operation and the low speed increasing operation for level correction from being repeated.

Example 3. FIG. 4 is an operation flowchart showing another embodiment of the fourth invention of the present invention. FIG.
Is also used in the third embodiment. In FIG. 4, step 51 of FIG. 3 is replaced with step 55, and when the car 2 descends to a predetermined position, the process proceeds to step 52, which has the same effect as the second embodiment.

[0043]

As described above, in the first invention of the present invention, when the car descends during the oil temperature increasing operation, in the second invention, when the descending speed of the car becomes a predetermined speed or more, and in the third invention. , When the car is lowered to a predetermined position, the oil temperature raising operation is stopped. Therefore, there is no pressure oil flowing from the hydraulic jack through the second opening / closing valve and the third opening / closing valve into the oil tank, and the car is lowered. It has the effect of preventing continuation.

Further, in the fourth aspect of the invention, after the third on-off valve is closed, the car is operated to move up at a low speed and then to the descending floor-matching operation.
The on-off valve closes after opening, and even when the second on-off valve is in an insufficiently closed state, it is returned to the normal state, and the oil temperature increasing operation and the low speed increasing operation for level correction are repeated, This has the effect of preventing accidents that could cause burnout due to an abnormal temperature rise of the electric motor.

[Brief description of drawings]

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

FIG. 2 is an operation flowchart showing the first embodiment of the present invention.

FIG. 3 is an operation flowchart showing a second embodiment of the present invention.

FIG. 4 is an operation flowchart showing a third embodiment of the present invention.

[Explanation of symbols]

1 hydraulic jack, 2 car, 3 hydraulic pump, 4 electric motor, 5 1st opening / closing valve, 8 oil tank, 19 2nd opening / closing valve,
24 3rd on-off valve, 30 heating control device, 31 speed detector, 32 control device, 45 oil temperature rising operation stopping means, 5
3,54 Floor alignment operation means.

Claims (4)

[Claims] 1. A first opening / closing valve and a second opening / closing valve are provided in parallel between a hydraulic jack for driving a car and a hydraulic pump, and a third opening / closing valve is connected to the second opening / closing valve, which is connected to the hydraulic pump. Between the oil tank and the oil tank, drive control of the electric motor when the car is raised to change the rotation speed of the hydraulic pump,
The second on-off valve is opened to supply pressure oil to the hydraulic jack, and the electric motor is drive-controlled to change the rotational speed of the hydraulic pump when the car is descended to open the first on-off valve. The pressure oil in the hydraulic jack is discharged, the car is operated, and when the oil temperature becomes a predetermined value or less, the third opening / closing valve is opened to operate the electric motor to drive the pressure oil from the hydraulic pump to the oil tank. In a device for instructing an oil temperature increasing operation for causing an oil temperature to rise by increasing the oil temperature, an oil temperature increasing operation for stopping the oil temperature increasing operation when it is detected that the car has descended during operation according to the oil temperature increasing operation command An oil temperature rising operation device for a hydraulic elevator, which is equipped with a stopping means. 2. The oil temperature raising operation of the hydraulic elevator according to claim 1, wherein the oil temperature raising operation stopping means is configured to stop the oil temperature raising operation when the descending speed of the car exceeds a predetermined speed. apparatus. 3. The oil temperature increasing operation device for a hydraulic elevator according to claim 1, wherein the oil temperature increasing operation stopping means is configured to stop the oil temperature increasing operation when the car descends to a predetermined position. 4. A floor-matching operation means for causing the car to ascend at a low speed and thereafter perform a descending floor-matching operation after the operation of the oil temperature increasing operation stopping means is performed.
The oil temperature rising operation device for the hydraulic elevator according to any one of 1.