JPH0784309B2 - Hydraulic elevator controller - Google Patents

Description

The present invention relates to an elevator control device, and more particularly to a hydraulic elevator control device that hydraulically drives an elevator.

[Prior Art] As a conventional hydraulic elevator control device of this type, a technique disclosed in JP-A-57-98477 can be mentioned.

FIG. 8 is an overall configuration diagram showing a conventional hydraulic elevator control device.

In the figure, 2 is an elevator car, 3 is a hydraulic jack for moving the elevator car 2 up and down by a plunger 4, and 5a is oil supplied as pressure oil 5 to the hydraulic jack 3.

Reference numeral 71 denotes an AC motor driven by application of an AC power source (not shown), and 72 denotes oil 5a driven by the AC motor 71 and pressure oil 5a to a flow control valve 74 through a relief valve 73.
It is a hydraulic pump that delivers as. Further, the flow rate control valve 74 sends the inflowing pressure oil 5 to the hydraulic jack 3 or the oil tank 75 in a switchable manner.

Next, the operation of the conventional hydraulic elevator control device configured as described above will be described.

When the elevator car 2 is called for rising, an AC power source is applied to drive the AC electric motor 71, whereby the hydraulic pump 72 rotates, and the oil 5a in the oil tank 75 is used as the pressure oil 5 via the relief valve 73. It is sent to the flow control valve 74. At this time, the flow control valve 74 is opened on the oil tank 75 side, and the pressure oil 5 is returned to the oil tank 75. Therefore, the pressure oil 5 is in an idling state in which it returns from the oil tank 75 to the oil tank 75 through the hydraulic pump 72, the relief valve 73, and the flow rate control valve 74. In the idling state, the flow control valve
Since 74 is gradually closing the oil tank side, hydraulic jack 3
The side opens. For this reason, the pressure oil 5 is transferred to the hydraulic jack 3
And the elevator car 2 starts to rise. Further, when the flow control valve 74 is fully closed on the oil tank side and is fully open with respect to the hydraulic jack 3, the hydraulic pump
All of the pressure oil 5 delivered by 72 flows into the hydraulic jack 3. Therefore, the elevator car 2 is driven at a constant rising speed.

When the elevator car 2 approaches the floor where the elevator car 2 stops, the flow control valve 74 gradually opens the oil tank side, so that the fully opened state of the hydraulic jack 3 is gradually closed. Therefore, the amount of the pressure oil 5 flowing into the hydraulic jack 3 gradually decreases. Therefore, the speed of the elevator car 2 is gradually reduced, and when the floor to be stopped and the floor of the elevator car 2 are in a predetermined position, the flow control valve 74 is fully closed on the oil tank side and the hydraulic jack 3 Side is fully closed,
The elevator car 2 is stopped.

When the elevator car 2 descends, the AC motor 71
Is not driven, and the flow control valve 74 operates to release the closed state of the hydraulic jack 3. Therefore, the pressure oil 5 in the hydraulic jack 3 is changed by the weight of the elevator car 2 and the like.
Flows into the oil tank 75. Therefore, the elevator car 2 descends due to its own weight.

Further, as described above, when the hydraulic elevator is driven and the pressure inside the pipeline becomes abnormally high, the relief valve 73 operates and the internal pressure of the pipeline is released by letting pressure oil escape to the oil tank. Thus, the pressure is reduced to prevent the control equipment such as the AC motor 71 or the hydraulic pump 72 from being broken down, and the safe operation of the hydraulic elevator is maintained.

On the other hand, as an improved technique of the above conventional example, without controlling the car by the flow control valve 74, the voltage and frequency of the power supply for driving the AC electric motor 71 are changed to change the rotation speed and the driving direction of the AC electric motor 71. The method of controlling the hydraulic elevator by modification is used. That is, by controlling the rotation speed of the hydraulic pump 3 by the AC electric motor 71, the moving speed of the elevator car 2 is controlled, and by controlling the rotation direction, the pressure oil 5 of the hydraulic jack 3 is controlled. The moving direction of the elevator car 2 is controlled by controlling inflow or discharge.

[Problems to be Solved by the Invention] Since the conventional elevator control device is configured as described above, the hydraulic pump 72 causes the pressure oil 5 to flow into and out of the hydraulic jack 3 so that the elevator car 2
When the hydraulic pressure rises abnormally, safe operation of the hydraulic elevator is maintained by operating the relief valve 73.

However, in the hydraulic elevator control device as in the above-mentioned conventional example, the relief valve 73 operates when the hydraulic pressure in the pipeline through which the pressure oil 5 is fed reaches the set value. At this time, if the passage of the pressure oil 5 becomes narrow due to a failure of the flow control valve 74 or the relief valve 73 itself and the resistance of the fluid passage gradually increases, the AC electric motor 71 is operated under a large load hydraulic pressure. The pump 72 must continue to rotate, which may shorten the life of the hydraulic pump 72 or the AC electric motor 71.

Further, in the improved technique of the conventional example, the hydraulic pump 72 is reversely rotated by the AC electric motor 71, and the elevator car 2
Therefore, when a failure similar to that of the conventional example occurs, the internal pressure of the pipeline of the pressure oil 5 is reduced to a negative pressure, which causes abnormal noise and damage to the pipeline. It could happen.

On the other hand, in the prior art of this type of elevator control device,
There is a technique disclosed in JP-A-61-229787.

The technique disclosed in this publication controls an electric motor according to a pattern signal and drives a hydraulic pump by the electric motor to drive a car when an operation command signal is issued. However, similar to the above-described conventional hydraulic elevator control device, in the case of a failure of the hydraulic jack, the hydraulic pump, the electromagnetic switching valve having the function of switching the flow direction of the hydraulic pressure, the pipe connecting the hydraulic jack and the hydraulic pump, the AC The electric motor must continue to rotate with a large load applied, which may shorten the life of the hydraulic pump or the AC electric motor. In particular, when controlling the electric motor according to the pattern signal, the electric motor is controlled according to the pattern signal, and when the pressure detector and the piping, various devices arranged in the piping become abnormal, the pattern It becomes unclear whether the signal can follow the signal, and the abnormality cannot be detected promptly. Further, there is no disclosure of a technique for detecting a species abnormality.

Therefore, the present invention provides a control device for a hydraulic elevator, which has a high safety and can deal with an abnormality in each device arranged in the pressure oil pipeline promptly, and which can be dealt with economically. This is an issue.

[Means for Solving the Problems] A control device for a hydraulic elevator according to the present invention includes a hydraulic jack for vertically moving an elevator car in a hoistway,
A hydraulic pump that sends pressure oil to the hydraulic jack, an electromagnetic switching valve that switches between stop and check directions of the pressure oil between the hydraulic jack and the hydraulic pump, and a hydraulic jack side of the electromagnetic switching valve. A first hydraulic pressure detection unit that is connected to detect the hydraulic pressure on the car load side, a second hydraulic pressure detection unit that detects the hydraulic pressure on the discharge side of the hydraulic pump rather than the electromagnetic switching valve, and a predetermined drive pattern for the hydraulic pump. And a speed control means for abnormally controlling the hydraulic pump when the output of the first hydraulic pressure detecting section or the second hydraulic pressure detecting section or the difference between the two exceeds a predetermined range.

[Operation] In the present invention, the first hydraulic pressure detecting unit is connected to the hydraulic jack for vertically moving the elevator car in the hoistway and is installed in the pipeline for supplying the pressure oil to detect the hydraulic pressure on the car load side. The second hydraulic pressure detection unit detects the hydraulic pressure on the discharge side of the hydraulic pump. Then, the hydraulic pump is driven using a predetermined pattern to control the movement of the elevator car. Further, the abnormality is judged by comparing the output of the first hydraulic pressure detection unit or the second hydraulic pressure detection unit or the difference between them with a preset range.

[Examples] Examples of the present invention will be described below.

FIG. 1 is an overall configuration diagram showing a hydraulic elevator control device according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing speed control means of the hydraulic elevator control device according to an embodiment of the present invention. Is. 4 and 5 are explanatory views of a control pattern for controlling the control device for the hydraulic elevator according to an embodiment of the present invention, and FIGS. 6 and 7 show an embodiment of the present invention. It is explanatory drawing of the output of the 1st hydraulic pressure detection part of the control apparatus of a hydraulic elevator, and the 2nd hydraulic pressure detection part, The timing relationship is FIG. 6 and FIG. 7 is the same as FIG. In the figure, the same symbols and symbols as in the conventional example are
It shows a part that is the same as or equivalent to the component of the conventional example.

In FIG. 1, 1 is an elevator hoistway, 2 is an elevator car, 3 is a hydraulic jack, 4 is a plunger, 5 is pressure oil, 6 is a three-phase induction motor, 7 is a hydraulic pump, and 8 is an oil tank.

Reference numeral 9 is an electromagnetic switching valve arranged between the hydraulic jack 3 and the hydraulic pump 7. The electromagnetic switching valve 9 has a function of switching the direction in which the pressure oil 5 is prevented from flowing in the reverse direction, that is, the check direction.

Reference numeral 11 is a pipe connecting the electromagnetic switching valve 9 and the hydraulic jack 3, and reference numeral 12 is a first hydraulic pressure detection unit for detecting the hydraulic pressure attached to the pipe 11. The first hydraulic pressure detection unit 12 detects the hydraulic pressure that flows in or out of the load side of the elevator, that is, the hydraulic jack 3. Reference numeral 13 denotes the first hydraulic pressure detection unit arranged between the hydraulic pump 7 and the electromagnetic switching valve 9.
It is a second hydraulic pressure detection unit having the same function as 12. The second oil pressure detector 13 detects the oil pressure of the pressure oil 5 discharged from the hydraulic pump 7. Reference numeral 14 is a speed detection unit in which a rope 15 is stretched between the upper part and the bottom part of the elevator hoistway 1 and the rope 15 detects the ascending / descending speed of the elevator car 2. Reference numeral 16 is an oil temperature detection unit that detects the temperature of the oil in the oil tank 8.

Reference numeral 21 is a rectifying unit composed of a rectifying element such as a silicon rectifying element for rectifying three-phase alternating current “R, S, T” into direct current, 22 is a smoothing capacitor for smoothing the power source rectified by the rectifying unit 21, and 23 is An inverter that converts the power source smoothed by the smoothing capacitor 22 into a three-phase AC voltage having a required frequency, and a three-phase AC voltage converted by the inverter 23 by closing the inverter 24 to the three-phase induction motor 6 A relay 25 to be connected is a speed detector that is generated by driving the three-phase induction motor 6. The speed detector 25 generates an output voltage proportional to the rotation speed. 26 is connected to the output side of the rectifying unit 21, converts the rectified DC output into AC again,
An inverter that regenerates electric power in addition to the input side of the rectifying unit 21.

27 is the output signals 12a and 13a of the first hydraulic pressure detection unit 12 and the second hydraulic pressure detection unit 13, and the car speed signal 14 of the car speed detection unit 14.
a, an oil temperature signal 16a of the oil temperature detection unit 16, a voltage output 25a proportional to the rotation speed of the speed detector 25, and a normally open contact 30d that is closed from when a start command is issued until a stop command is issued. It is a speed control means to which the generated operation signal 30da is input. The speed control means 27 outputs a control signal 27a and variably controls the frequency of the three-phase AC output from the inverter 23. Further, the speed control means 27 is the relay
By controlling the closing of 24 with the control signal 24a, the three-phase induction motor 6
Control the start of driving. Then, the speed control means 27 controls the output frequency of the inverter 23 according to a plurality of set control patterns, and controls the drive speed of the three-phase induction motor 6. Therefore, the elevator car 2
Moves up and down according to the control pattern of the speed control means 27.

In FIG. 2, 38 is the output value 13 of the first hydraulic pressure detection unit 13.
When a becomes substantially equal to the output value 12a of the second hydraulic pressure detection unit 12, the comparison circuit for holding the pattern value as it is output from the stop pattern generation circuit 39 as shown in FIG. 4 (d) or FIG. 5 (d) And the like. The stop pattern generation circuit 39 is a stop pattern generation circuit that holds the elevator car 2 in a stopped state on each floor. The stop pattern generation circuit 39 corrects the descent of the elevator car 2 due to leakage of the pump of the hydraulic system circuit and stops the elevator car 2 at a fixed position.

40 is a floor alignment command circuit that generates a speed signal corresponding to the position when the car is out of the normal stop position. When the stop command signal 10a outputs "L", NOT gate 43 outputs "H". In addition, when the output signal 56a of the position generation signal 56 produces an output corresponding to a predetermined out-of-floor, a command is issued. 41U is a rising pattern generation circuit for outputting the rising pattern signal shown in FIG. 4 (b). The rising pattern generation circuit 41U outputs a control pattern when the elevator car 2 is rising, as shown in FIG. 4 (b). As shown in FIG. 5 (b), 41D is a descending pattern generating circuit for outputting a control pattern when the elevator car 2 is descending, similar to the ascending pattern generating circuit 41U,
The rising pattern generation circuit 41U and the falling pattern generation circuit 41D are normally closed until the stop command is issued after the deceleration command signal 9a and the stop command signal 10a and the start command, which are obtained as known elevator control signals. The operation signal 30da generated by the open contact 30d is input. 45U is the fourth
Ascending floor alignment pattern generation circuit for controlling the car position when the elevator car 2 is floating as shown in FIG.
Similar to the raised floor matching pattern generating circuit 45U shown in FIG. 7C, it is a descending floor matching pattern generating circuit for controlling the car position at the time of sinking, and corresponds to the above-mentioned 41U and 41D. When the normal call operation command 30da is generated, the output of the NOT gate 44 becomes "L", so 45U and 45D are not output. Therefore, 41U, 41D and 45U, 45D do not generate patterns at the same time. 41Ua is an ascending operation switch that continues to be closed during ascending operation, 41Da is a descending operation switch that continues to be closed during descending operation operation, 41Ub is a stop operation switch that continues to be closed at the time of a floor alignment command during stopping and ascending, and 41Db is stopping Stop operation switches that continue to be closed at the time of floor alignment command at the time of sinking and sinking, and these are switching signals obtained as known elevator control signals. 46 is the raising operation switch 41
Ua, the descending operation switch 41Da, the stop operation switch 41Ub, the required control patterns generated from the respective pattern generation circuits 41U, 41D and the stop holding pattern generation circuit 39 selected by the stop operation switch 41Db are summed up, and the result of the summation is calculated. It is a pattern summing circuit that outputs a combination pattern.

47 is a signal conversion circuit that converts the speed signal 14a detected by the car speed detection unit 14 into a predetermined signal level for feedback control, and 48 is a comparison circuit that compares the outputs of the signal conversion circuit 47 and the comparison and addition circuit 55. It is a comparison / subtraction circuit that outputs a difference. Reference numeral 49 is an amplification circuit for amplifying the output of the comparison / subtraction circuit 48 to a predetermined value, and 50 is a signal to which the elevator car speed converted by the amplification circuit 49 and the signal conversion circuit 47 is added and outputs a frequency proportional to the speed. Speed frequency generation circuit, 51 is a voltage conversion circuit for converting into a voltage that linearly increases or decreases according to the speed frequency of the output signal of the speed frequency generation circuit 50, 52 is the output of the voltage conversion circuit 51 and the speed frequency generation circuit 50 Corresponding to, the reference sine wave generating circuit outputs a control signal 27a for controlling the inverter 23. 53 is a signal conversion circuit that converts the car speed signal 14a output of the car position detection unit 14 to a predetermined signal level, 54 is the difference between the output of the signal conversion circuit 53 and the output of the rising pattern generation circuit 41U or 41D. And 55 is a comparison and addition circuit for adding the outputs of the comparison and subtraction circuit 54 and the pattern summation unit 46. The comparison / addition circuit 55 operates the electromagnetic switching valve 9 according to the output of the comparison / subtraction circuit 54 or the pattern summation circuit 46, and also operates the relay 24 in the same manner, to normally-open contacts 24A-24C. Is to be closed. Reference numeral 56 is a position signal generation circuit that integrates the output of the signal conversion circuit 53, converts it into a car position signal 56a, and outputs it to the floor alignment command circuit 40.

In FIG. 3, 60 is shown in FIG. 6 (a) or FIG. 7 (a).
As indicated by 12as, a reference signal setting circuit for setting and outputting a reference signal to be compared with the output 12a of the first hydraulic pressure detection unit 12 corresponding to the ascending and descending patterns, 61 is a sixth
As shown in FIG. 7B or FIG. 7B, a reference signal that is compared with the differential pressure pattern between the output 12a of the first hydraulic pressure detection unit 12 and the output 13a of the second hydraulic pressure detection unit 13 is output. Reference signal setting circuit, 62 is 13as in FIG. 6 (a) or FIG. 7 (a).
Corresponding to the rising and falling patterns,
It is a reference signal setting circuit that outputs a reference signal to be compared with the output 13a of the second hydraulic pressure detection unit 13. 63 is a comparison circuit that compares the reference signal output from the reference signal setting circuit 60 and the output 12a of the first hydraulic pressure detection unit 12, 64 is the same as the comparison circuit 63, the output of the reference signal setting circuit 61, and It is a comparison circuit which compares the difference of the output of a 1st oil pressure detection part and a 2nd oil pressure detection part. Reference numeral 65 is a comparison circuit for comparing the output 13a of the second hydraulic pressure detection unit 13 and the output of the reference signal setting circuit 62.
Further, each of the comparison circuits 63, 64 and 65 outputs a signal "H" to the NOR gate 66 when the comparison result exceeds the range of the reference value. Reference numeral 67 is an AND gate that is turned on when the output signal 55a of the NOR gate 66 and the comparison and addition circuit 55 is a predetermined value or more.

Next, the operation of the control device for the hydraulic elevator according to the present embodiment configured as described above will be described.

First, the general operation of the control device for the hydraulic elevator according to this embodiment will be described.

When the elevator car 2 is called by the user on the floor, the relay 24 is closed and the output of the inverter 23 is added to the three-phase induction motor 6. Therefore, the three-phase induction motor 6
Is driven according to the voltage and frequency output from the inverter 23 to drive the hydraulic pump 7 in a predetermined rotation speed and rotation direction. When the elevator car 2 is raised, pressure oil 5 is sent to the hydraulic jack 3 to extend the plunger 4, and conversely,
When the elevator car 2 is lowered, pressure oil 5 is discharged from the hydraulic jack 3 to contract the plunger 4,
It operates to move the elevator car 2 up and down.

Specifically, when the elevator car is called on the upper floor, the raising operation switch 41Ua is closed, and the raising pattern generation circuit 41U uses the raising pattern shown in FIG. , To the comparison and addition circuit 55.
The comparison / addition circuit 55 includes the rising pattern generation circuit 41U.
From the signal input from, that is, the signal of the rising pattern,
The signal 55a is output to the AND gate 67.

On the other hand, since the rising pattern generation circuit 41U outputs the signal shown in FIG. 4A to the reference signal setting circuit 61, the reference signal setting circuit 61 outputs the reference pressure pattern to the comparison circuit 63. Then, it is compared with the output 12a of the first hydraulic pressure detection unit 12 in the comparison circuit 63. At this time, FIG. 4 (a)
Also, as shown in FIG. 4 (b), the hydraulic pump 7 has not been driven yet, so the hydraulic pressure detected by the first hydraulic pressure detection unit 12 is close to zero. Therefore, the comparison circuit 63 outputs the signal "L".
The NOR gate 67 is turned on to output a signal to the AND gate 68. Therefore, the AND gate 68
Is turned on, relay 24 operates and normally open contacts 24A-2
Close 4C. Therefore, the three-phase induction motor 6 receives the output of the inverter 23, starts driving, rotates the hydraulic pump 7, and starts raising the elevator car 2. At this time,
The inverter 23 follows the rising pattern to increase the frequency of the output voltage, and the speed of the elevator car 2 becomes as shown in FIG. 4 (b).

Since the three-phase induction motor 6 changes its rotation speed and rotation direction according to the change of the frequency of the input voltage, the hydraulic pump 7 changes the amount of pressure oil 5 to be fed along the rising pattern. To raise. Therefore, the elevator car 2 continues to rise at the moving speed that follows the rising pattern. The rotation speed of the three-phase induction motor 6 is detected by the speed detector 25 and fed back to the comparison / subtraction circuit 48 and the speed frequency generation circuit 50 through the signal conversion circuit 47. The output 12a of the first hydraulic pressure detection unit 12 and the output 13a of the second hydraulic pressure detection unit 13 in the meantime follow the rising pattern of FIG. The difference from the output 13a of the oil pressure detection unit 13 has the pattern shown in FIG. 6 (b).

Next, the descent operation will be described.

When descending, the car speed pattern is as shown in Fig. 5 (a), which is the reverse of that at ascending in Fig. 4 (a). Therefore, the three-phase induction motor 6 once rotates in the normal direction, then in the reverse direction, and while braking, the elevator car Two
Is controlled as shown in FIG. 5 (a), but basically, it operates in the same manner as when rising. During this period, the output 12a of the first hydraulic pressure detection unit 12 and the output 13a of the second hydraulic pressure detection unit 13 follow the rising pattern of FIG. 7 (a), and the output 12a of the first hydraulic pressure detection unit 12 and the output 12a (2) Output 13a of hydraulic pressure detection unit 13
The difference is with the pattern of FIG.

Next, the stop will be described.

When the elevator car 2 comes to the normal stop position, the stop command signal 10a becomes "L", and the ascending operation switch 41Ua and the descending operation switch 41Da are opened, so that the ascending pattern generating circuit 41U and the descending pattern generating circuit 41D become zero. Becomes At the same time, since the output of the negation circuit 43 becomes "H", the rising floor alignment pattern generation circuit 45 and the falling floor alignment pattern generation circuit 45D correspond to the position signal 56a from the position signal generation circuit 56 (FIG. 4 (c)). A velocity pattern is generated such as the rising floor alignment pattern for controlling the floor stop at the time of ascending or the falling floor alignment pattern for controlling the floor at the time of descending shown in FIG. 5 (c). At this time, since either the stop operation switch 41Ub or the stop operation switch 41Db is closed, the elevator car 2 stops according to the floor deceleration pattern at the traveling position.

When entering a range slightly smaller than the regular stop position on the floor, the speed accuracy of the elevator car 2 also becomes a problem, the speed of the elevator car 2 becomes zero speed, and the stop operation switch 41Ub and the stop operation switch 41Db are opened. However, since the stop pattern generation circuit 39 generates a predetermined pattern for maintaining the stopped state of the elevator car 2, the three-phase induction motor 6 rotates at a low speed to correct the leakage amount phase equalization and the elevator car. 2 is held in place.

Next, floor alignment will be described.

Now, suppose that the elevator car 2 is out of a very small range due to some reason, for example, oil leak or movement of passengers, the car position signal 56a is output from the position signal generating circuit 56, and the car The pattern shown in FIG. 5 (c) is generated from the descending floor alignment pattern generation circuit 45D by the position signal 56a. At the same time, the stop operation switch 41Db is also closed, and the elevator car 2 is set on the floor according to the speed pattern matching the current position of the elevator car 2.

In this case as well, the rising floor alignment pattern generation circuit 45U or the falling floor alignment pattern generation circuit 45D is input to the reference signal setting circuits 60 to 62, so that the predetermined pressure range is set according to the operation mode, and the comparison circuit. The comparison is made from 63 to 65, and within the normal range, the three-phase induction motor 6 is not shut off.

Next, the case of abnormality will be described.

It is assumed that there is a call in the ascending direction and a start command is issued, but for some reason, for example, the check valve 9 did not open. At this time, the three-phase induction motor 6 is driven in the same manner as in FIG. 4 (a), and the hydraulic pump 7 discharges oil, but since it is blocked by the check valve 9, the second hydraulic pressure detection unit 13 The output signal 13a is the sixth
It rises as shown in FIG. 7C, which exceeds the range of the reference output signal 13as of the second hydraulic pressure detector 13, so that the time t00 to t
During 01, the comparison circuit 65 outputs “H”, the relay 24 is demagnetized, the normally open contacts 24A to 24C are opened, the three-phase induction motor 6 is stopped, and the pressure of the second hydraulic pressure detection unit 13 is changed. Stop rising.

Further, the comparison circuit 64 does not have the configuration shown in FIG.
Since it becomes negative between 0 and t01, "H" output is generated and abnormality can be checked in the same way as above.

Next, when there is a call in the descending direction and the three-phase induction motor 6 reversely rotates, the hydraulic pump 7 also reverses, and the discharge side of the hydraulic pump 7 becomes negative pressure (negative pressure) as shown in FIG. 7 (c). . In this case, since the output signal 13a of the second hydraulic pressure detection unit 13 in FIG. 5 (a) leaves the normal range between t11 and t12, the comparison circuit 65 outputs “H”, and similarly, the relay 24 is demagnetized. Accordingly, the normally open contacts 24A to 24C are opened, the three-phase induction motor 6 is stopped, and further, the negative pressure can prevent the hydraulic pump 7 from being damaged.

As described above, the control device for the hydraulic elevator according to the present embodiment,
A first hydraulic pressure detection unit 12 connected to a hydraulic jack 3 for vertically moving an elevator car 2 in the hoistway 1 and arranged in a pipeline for supplying pressure oil to detect a hydraulic pressure on a car load side; A second hydraulic pressure detection unit 13 that is connected to a hydraulic pump 7 that sends pressure oil to the jack 3 and that detects the hydraulic pressure on the discharge side of the hydraulic pump 7 and the hydraulic pump 7 are driven in a predetermined drive pattern, One hydraulic pressure detection unit 12 or second hydraulic pressure detection unit 13
The speed control means 27 for stopping the driving of the hydraulic pump 7 when the output or the difference between the two exceeds a predetermined range.

Therefore, in the present embodiment, the discharge pressure on the hydraulic pump 7 side,
Abnormal because it detects the pressure on the elevator car 2 side and sets the normal range for each operating mode for each pressure and the pressure difference between the two, and when this range is exceeded, the three-phase induction motor 6 is shut off. Can be detected early, and damage such as equipment damage can be suppressed or eliminated.

It should be noted that in the above embodiment, the upper limit side of the pressure range has been described, but it is also possible to set it to the lower limit side and the same effect can be obtained.

As described above, the control device for the hydraulic elevator according to the present invention is
A first hydraulic pressure detection unit that is connected to a hydraulic jack that raises and lowers an elevator car in a hoistway and that supplies pressure oil, and that detects the hydraulic pressure on the car load side; A second hydraulic pressure detection unit that is connected to a hydraulic pump that sends out a hydraulic pressure on the discharge side of the hydraulic pump,
The hydraulic pump is driven in a predetermined drive pattern, and speed control means for controlling the drive of the hydraulic pump when the output of the first hydraulic pressure detection unit or the second hydraulic pressure detection unit exceeds a predetermined range. It is a thing.

Therefore, the first hydraulic pressure detection unit is connected to a hydraulic jack that moves the elevator car up and down in the hoistway up and down, and is arranged in a pipeline that supplies pressure oil to detect the hydraulic pressure on the car load side. The hydraulic pressure detection unit detects the hydraulic pressure on the discharge side of the hydraulic pump, and compares the output of the first hydraulic pressure detection unit or the second hydraulic pressure detection unit or the difference between the two with a preset range to determine a predetermined normal value. When you leave the range drive pattern,
Since the speed control means controls the hydraulic pump abnormally, the abnormality appears in either the first hydraulic pressure detection unit or the second hydraulic pressure detection unit, or the output of the difference between the first hydraulic pressure detection unit and the second hydraulic pressure detection unit, When an abnormality occurs in each device arranged in the pressure oil pipeline, it can be promptly dealt with. In addition, since the outputs of the first hydraulic pressure detection unit and the second hydraulic pressure detection unit can be targeted for abnormality determination, safety is high, and damage such as damage to various devices can be suppressed, which is economical. .

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a hydraulic elevator control device according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing speed control means of the hydraulic elevator control device according to an embodiment of the present invention. 4 and 5 are explanatory views of a control pattern for controlling the control device for the hydraulic elevator according to the embodiment of the present invention, and FIGS. 6 and 7 are control for the hydraulic elevator according to the embodiment of the present invention. FIG. 8 is an explanatory diagram of outputs of a first hydraulic pressure detection unit and a second hydraulic pressure detection unit of the apparatus, and FIG. 8 is an overall configuration diagram showing a conventional hydraulic elevator control device. In the figure, 1: hoistway 2: elevator car 3: hydraulic jack 9: hydraulic pump 12: first hydraulic pressure detection unit 13: second hydraulic pressure detection unit 27: speed control means. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A hydraulic jack for vertically moving an elevator car in a hoistway, a hydraulic pump for delivering pressure oil to the hydraulic jack, and a stop and reverse of the pressure oil between the hydraulic jack and the hydraulic pump. An electromagnetic switching valve that switches the stop direction, a first hydraulic pressure detection unit that is connected to the hydraulic jack side of the electromagnetic switching valve to detect the hydraulic pressure on the car load side, and a discharge side of the hydraulic pump that is closer to the electromagnetic switching valve. When the second hydraulic pressure detection unit that detects the hydraulic pressure of the second hydraulic pressure pump and the hydraulic pump are driven in a predetermined drive pattern, and the output of the first hydraulic pressure detection unit or the second hydraulic pressure detection unit or the difference between the two exceeds a predetermined range. And a speed control means for abnormally controlling the hydraulic pump.