JP2628117B2 - Hydraulic elevator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a hydraulic elevator, and more particularly to an improvement in a control operation at a time of a descending operation of a car.

[0002]

2. Description of the Related Art FIG. 6 is an overall configuration diagram showing an example of a conventional hydraulic elevator control device, and FIG. 7 is a longitudinal sectional view showing details of an on-off valve in FIG. 6 and 7, 1 is a hydraulic jack, 2 is a car supported by the hydraulic jack 1,
Reference numeral 3 denotes a hydraulic pump capable of reversible rotation, and reference numeral 4 denotes an electric motor for driving the hydraulic pump 3. Reference numeral 5 denotes an on-off valve, in which a main chamber 52 and a back chamber 53 are formed inside the main body 51, and a valve body 54 is disposed in the main chamber 52 and the back chamber 53 so as to be slidable up and down. Is sealed by an O-ring. The on-off valve 5 is provided between the hydraulic jack 1 and the hydraulic pump 3 in a main chamber 52.
Are connected, and the valve element 54 is operated up and down by the inflow and outflow of pressure oil into the back chamber 53, and the hydraulic jack 1 and the hydraulic pump 3
To open and close the flow path of the pressure oil. When the car 2 is running, the car 2 is opened, and when the car 2 is stopped, the car 2 is closed.

[0003] Reference numeral 6 denotes a hydraulic oil main circuit connected in order of the hydraulic jack 1, the on-off valve 5 and the hydraulic pump 3.
Circuit 6a, the hydraulic jack 1
A second circuit 6b is provided between the valve and the on-off valve 5. 7 is a filter, 8 is an oil tank. Reference numeral 9 denotes a pilot circuit comprising a hydraulic oil inflow circuit 9a for connecting the hydraulic jack 1 and the back chamber 53 of the on-off valve 5, and a hydraulic oil discharge circuit 9b for connecting the back chamber 53 and the oil tank 8.

A normally open solenoid valve 10 is provided in the pressure oil inflow circuit 9a and opens and closes the pressure oil inflow circuit 9a. A solenoid valve 11 is provided in the pressure oil discharge circuit 9b and opens and closes the pressure oil discharge circuit 9b. A normally closed solenoid valve, 12 and 13 are variable throttle valves for adjusting the flow rate of pressure oil in the pressure oil inflow circuit 9a and the pressure oil discharge circuit 9b, respectively, and 14 is a control unit for controlling the solenoid valves 10 and 11 and the electric motor 4. is there.

Next, the operation of this control device will be described with reference to FIGS. 6 and 7. When the car 2 rises, hydraulic oil is supplied to the on-off valve 5 by the hydraulic pump 3 driven by the electric motor 4 in response to a command from the control unit 14, and the normally open solenoid valve 10 is activated in response to the rising operation command for the car 2. The closed and normally closed solenoid valve 11 is opened, and the back chamber 53 due to the resistance of the variable throttle valve 13 is opened.
The on-off valve 5 opens in accordance with the speed of discharging the pressure oil in the oil tank 8, and the pressure oil from the first flow path 6 a passes through the opening of the on-off valve 5, the main chamber 52, and the second flow path 6 b to the cylinder 1 and the car 2 rises at a predetermined acceleration.

When a lowering operation command is issued to the car 2, the normally open solenoid valve 10 is energized by the control unit 14 to close the pressure oil inflow circuit 9a, and thereafter the normally closed electromagnetic valve 11 is energized. The pressure oil discharge circuit 9b opens. Thereby, the pressure oil in the back chamber 53 of the on-off valve 5 is discharged to the oil tank 8, and the on-off valve 5 is opened. When the on-off valve 5 opens, the pressure oil in the hydraulic jack 1 is pushed out by the weight of the car 2 and the hydraulic jack 1 →
It is discharged to the oil tank 8 via the on-off valve 5 → the hydraulic pump 3 → the filter 7. Thereafter, the hydraulic pump 3 driven by the electric motor 4 in accordance with a command from the control unit 14 discharges the pressure oil in the hydraulic jack 1. The electric motor 4 connected to the hydraulic pump 3 is subjected to a dynamic braking operation in order to drive the hydraulic pump 3 with 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, the control unit 14
By controlling the rotation speed of the electric motor 4, the car 2 descends according to a predetermined operation pattern. When the car 2 arrives at the predetermined floor, the car 2 stops, the control unit 14 issues a command to close the on-off valve 5, and the normally closed solenoid valve 11 provided in the pressure oil discharge circuit 9b is demagnetized, and the pressure oil discharge circuit 9b is closed, and the normally open solenoid valve 10 provided in the pressure oil inflow circuit 9a is demagnetized to open the pressure oil inflow circuit 9a. Thereby, the on-off valve 5 is fully closed.

[0007]

The conventional hydraulic elevator control device as described above drives the hydraulic pump with pressure oil discharged by the pressure in the hydraulic jack generated by the weight of the car when the car descends, The electric motor is coupled to the hydraulic pump and is regulated at a constant speed by the dynamic braking operation of the electric motor to descend. However, if the power supplied to the motor during the descent of the car is cut off due to a power failure or the like, the braking force of the motor during the dynamic braking operation is lost, and the rotation speed of the motor becomes larger than the rated control rotation speed. However, there is a problem that the descending speed of the car becomes faster than the rated speed, and the traveling distance from when the car stops to when the on-off valve closes becomes longer.
Also, since the fully open position of the on-off valve cannot be checked from outside,
There is a problem that inspection of the fully open state is impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the speed of a car is equal to or higher than a predetermined value even when the power supplied to the motor is cut off due to a power failure or the like while the car is traveling downward. It is an object of the present invention to provide a hydraulic elevator control device capable of suppressing the opening of the on-off valve from the outside and further confirming the fully open position of the on-off valve from outside.

[0009]

A control device for a hydraulic elevator according to the present invention includes a full-open position adjusting means for regulating a full-open position of an on-off valve and detects a pump pressure between the on-off valve and the hydraulic pump. A pump pressure detector is provided, the pump pressure detector detects the pump pressure when the car is lowered at the rated speed in advance, and sets the fully open position of the on-off valve to be limited by the fully open position adjusting means.

Further, the control device for a hydraulic elevator according to the present invention includes a full-open position adjusting means for regulating a full-open position of the on-off valve, and a pump pressure detecting device for detecting a pump pressure between the on-off valve and the hydraulic pump. A jack pressure detector for detecting the jack pressure is provided between the on-off valve and the hydraulic jack, and the pump pressure and the jack when the car is lowered at the rated speed in advance by the two pressure detectors. The pressure is detected, and the fully open position of the on-off valve, which is limited by the fully open position adjusting means, is set so that the pressure difference between these two pressures becomes a predetermined value.

[0011]

According to the present invention, even if the braking action by the regenerative operation of the electric motor that drives the hydraulic pump is lost, the full open position of the open / close valve is regulated by the full open position adjusting means, so that the car can be moved at a predetermined descent speed. To run. Also, the pump pressure is detected while the car is descending at the rated speed, or both the pump pressure and the jack pressure are detected. It detects whether there is an abnormality in the restricted fully open position of the on-off valve.

[0012]

[Embodiment 1] First, before the description of the embodiment, the progress of development and the basic concept of the control apparatus for a hydraulic elevator according to the present invention will be described with reference to FIGS. Here, the same portions as those of the conventional example described with reference to FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. As a method for preventing the car descending speed from becoming excessive when the power is cut off, as shown in FIGS. 1 and 2, a stopper 55 is provided on the lid 55 of the on-off valve 5 in a liquid-tight structure, and the screw 57 is turned. The position of the lower end of the stopper 56 can be adjusted up and down freely by movement.
A method of regulating the position of the valve body 54 when it is fully opened by adjusting the contact position between the stopper 56 and the upper end of the valve body 54 in advance by a fully open position adjusting means comprising a screw 6 and a screw 57 is effective. .

In this system, as a procedure for determining the position of the valve element 54 at a predetermined car speed by the power generation control (regeneration) operation of the electric motor 4 when the car descends, for example, the car 2 is lowered in a normal power supply state, At this time, the position of the stopper 56 is adjusted and fixed so that the upper end surface of the valve body 54 and the tip end of the stopper 56 abut. Next, the car 2 is lowered to cut off only the power supply of the electric motor 4, and it is confirmed whether or not the lowering speed of the car 2 is a predetermined value even if the braking action by the electric motor 4 is lost.

The lowering operation of the car 2 is performed as follows. When the descending operation command is issued from the operation control device of the hydraulic elevator, the normally open solenoid valve 10 is energized by the control unit 14 to close the pressure oil inflow circuit 9a, and the normally closed electromagnetic valve 11 is energized. The pressure oil discharge circuit 9b opens. Thereby, the pressure oil in the back chamber 53 of the on-off valve 5 is discharged to the oil tank 8, and the on-off valve 5 is opened. When the on-off valve 5 is opened, the pressure oil in the hydraulic jack 1 is pushed out by the weight of the car 2 and discharged to the oil tank 8 via the hydraulic jack 1 → on-off valve 5 → hydraulic pump 3 → filter 7. At this time, the hydraulic pump 3 driven by the electric motor 4 by the control unit 14 discharges the pressure oil in the hydraulic jack 1. In order to drive the hydraulic pump 3 with 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, the electric motor 4 connected to the hydraulic pump 3 is subjected to a dynamic braking operation. Therefore, the control unit 14
By controlling the rotation speed of the electric motor 4, the car 2 descends according to a predetermined operation pattern.

When an acceleration traveling command for the descending operation is issued to the car 2, the normally open solenoid valve 10 is energized by the control unit 14 to close the pressure oil inflow circuit 9a, and the normally closed solenoid valve 11 is attached. And the pressure oil discharge circuit 9b is opened. As a result, the opening degree of the variable throttle 13 provided in the hydraulic discharge circuit 9b is changed so that the opening degree of the opening / closing valve 5 is gradually increased as the speed increases during acceleration traveling. The time from fully closed to fully open can be adjusted. When the valve element 54 rises and comes into contact with the stopper 5d, the on-off valve 5 is fully opened, and is fixed at the fully open position.

When the control unit 14 issues a command to close the on-off valve 5 a predetermined distance before the destination floor after the start of deceleration during the descent operation, the normally closed solenoid valve 11 is demagnetized and the pressure oil discharge circuit 9b is closed. At the same time, the normally open solenoid valve 10 is demagnetized and the pressure oil inflow circuit 9a is opened. As a result, the opening degree of the variable throttle 12 provided in the pressure oil inflow circuit 9a is changed so that the opening degree of the opening / closing valve 5 is gradually reduced as the opening degree of the opening / closing valve 5 is gradually reduced as the opening degree of the opening / closing valve 5 decreases. Can be adjusted until fully closed.

If the power supplied to the electric motor 4 is cut off due to a power failure or the like while the car 2 is descending, the braking action of the electric motor 4 is lost. The rotation speed of the pump 3 increases, the flow rate of the pressure oil discharged from the hydraulic jack 1 increases, and the lowering speed of the car 2 becomes higher than the rated speed. The tip of 56 is the valve element 54
The car 2 can be lowered at a predetermined speed set by detecting the pump pressure when the car is lowered at the rated speed in advance during normal lowering operation by contacting the upper end surface of the car 2.

FIG. 3 shows the stopper 5 when the car 2 is lowered.
6 is a diagram showing the relationship between the opening degree of the on-off valve 5 and the car speed obtained by restricting the fully open position of the valve element 54 in FIG.
That is, when the braking action of the electric motor 4 is lost, the car speed increases as shown by a chain line in FIG.
Is restricted by the stopper 56, so that the lowering speed V of the car according to the opening degree a of the on-off valve 5 due to this restriction.
d is obtained. As described above, the method in which the opening degree of the on-off valve 5 is limited by the stopper 56 abutting on the upper end portion of the valve element 54 is effective as a method for preventing the car descending speed from becoming excessive when the power is cut off. However, the fully opened position of the on-off valve 5 adjusted by the stopper 56 cannot be confirmed from the outside. Therefore, not only does it take time to adjust the fully open position of the on-off valve 5, but also if a failure occurs such that the fully open position of the on-off valve 5 changes due to a shift in the tip position of the stopper 56 or the like. This cannot be detected immediately. Such a problem can be solved by detecting the pressure in the hydraulic circuit and adjusting the fully open position of the on-off valve 5 or monitoring a failure or the like based on the detected value.

Next, how the control device for a hydraulic elevator according to the present invention is embodied will be described based on the illustrated embodiment. FIG. 4 is an overall configuration diagram of the first embodiment of the present invention. Reference numeral 15 denotes a pump pressure detector, which is mounted on the first circuit 6a between the on-off valve 5 and the hydraulic pump 3, and transmits the detected pressure value to the control unit 14.

Next, the operation of the hydraulic elevator control device of this embodiment when the car 2 is lowered will be described. When the car 2 travels at the rated speed during the descent operation, the hydraulic jack 1
The pressure oil flows through the path from the second circuit 6b → the on-off valve 5 → the first circuit 6a → the hydraulic pump 3 → the oil tank 8. When traveling at the rated speed during this descent operation, the pressure in the hydraulic jack 1
Pressure loss when hydraulic pressure passes through second circuit 6b, on-off valve 5, first circuit 6a, mechanical loss of hydraulic pump 3, motor 4
The pressure loss between the on-off valve 5 and the hydraulic pump 3 is detected by the pump pressure detector 15 to a predetermined value in consideration of the rotational loss of Is determined, and when the power supply to the electric motor 4 is cut off and the regenerative braking force is lost, the lowering speed when the car 2 descends can be suppressed to a predetermined speed or less. The pressure between the on-off valve 5 and the hydraulic pump 3 can be set to a predetermined value by adjusting the fully open position of the on-off valve 5 with the stopper 56. Conversely, the fully open position of the on-off valve 5 adjusted by the stopper 56 is indirectly visually recognized and confirmed by reading the detection value of the pump pressure detector 15 on a display device or the like provided in the control unit 14. Can be. Therefore, a failure in which the fully open position of the on-off valve 5 is changed due to, for example, a deviation of the tip position of the stopper 56 is easily found due to the fluctuation of the pressure value (the detection value of the pump pressure detector 15). If appropriate repairs are made by periodic inspections and the like, it is possible to prevent the abnormal lowering speed of the car from occurring.

Embodiment 2 FIG. In the first embodiment, when the car 2 travels at the rated speed during the descent operation, the pressure between the on-off valve 5 and the hydraulic pump 3 is set to a predetermined value so that when the hydraulic pressure passes through the on-off valve 5, Although the example of determining the passage loss has been described, as shown in FIG. 5, in addition to the configuration of FIG.
A jack pressure detector 16 for detecting a pressure between the pump pressure detector 1 and the hydraulic jack 1 is provided, and a control unit 14 detects a pressure difference between the pump pressure detector 15 and the jack pressure detector 16.

In this embodiment, when the car 2 travels at the rated speed during the descent operation, the difference between the pressure between the on-off valve 5 and the hydraulic jack 1 and the pressure between the on-off valve 5 and the hydraulic pump 3 is calculated as
The difference between the pump pressure detector 15 and the jack pressure detector 16 is detected, and this value is set to a predetermined value.
Is determined when the pressure oil passes through. The difference between the pressure between the on-off valve 5 and the hydraulic jack 1 and the pressure between the on-off valve 5 and the hydraulic pump 3 can be set to a predetermined value by adjusting the fully open position of the on-off valve 5 with the stopper 56. Becomes

[0023]

As described above, according to the present invention,
The pump pressure or the pump pressure and the jack pressure when the car is lowered at the rated speed are detected by the pump pressure detector and the jack pressure detector so that the fully open position of the on-off valve can be regulated by the fully open position adjusting means. In addition, since the pump pressure or the differential pressure between the pump pressure and the jack pressure is set to a predetermined value, the fully open position of the on / off valve restricted by the fully open position adjusting means is set, so that the fully open position of the on / off valve is adjusted. Can be performed with high accuracy and in a short time, and the car can be driven at a predetermined descending speed even if the braking effect of the regenerative operation of the electric motor that drives the hydraulic pump is lost. For this reason, the overrunning amount of the car can be reduced, and safety can be improved.
In addition, pump pressure detector and jack pressure detector
Since the fully open position of the on-off valve restricted by the fully-open position adjustment means can always be checked, if a failure occurs that changes the fully open position of the on-off valve, it can be detected immediately. If an appropriate repair is performed by a periodic inspection or the like, it is possible to prevent an abnormal car descending speed from occurring.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a hydraulic elevator control device for explaining the development process of the present invention.

FIG. 2 is a longitudinal sectional view showing calibration of an on-off valve which is a main part of FIG.

FIG. 3 is a diagram showing changes over time of a car descending speed and an opening degree of an on-off valve obtained by the apparatus of FIG. 1;

FIG. 4 is an overall configuration diagram of a first embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a second embodiment of the present invention.

FIG. 6 is an overall configuration diagram of a conventional hydraulic elevator control device.

FIG. 7 is a longitudinal sectional view showing the configuration of the on-off valve in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic jack 2 Basket 3 Hydraulic pump 4 Electric motor 5 On-off valve 15 Pump pressure detector 16 Jack pressure detector 56 Stopper

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor: Kazuya Kazuo 1 Hishicho, Inazawa-shi Mitsubishi Electric Corporation Inazawa Works (56) References JP-A-58-42579 (JP, A) JP-A-4-121373 (JP, A) Jiko 60-19091 (JP, Y2)

Claims (2)

(57) [Claims] 1. A hydraulic pump driven by a motor to supply pressure oil from a hydraulic pump to a hydraulic jack to raise the car and rotate the hydraulic oil in the hydraulic jack by regenerative braking of the electric motor. after the car descends operated by exiting exhaust, a between the hydraulic jack and a hydraulic pump, when the car is traveling is open, is closed when they are shut car stop <br/> On-off valve and fully open
In a hydraulic elevator equipped with a full-open position adjusting means for regulating a position , a pump pressure is detected between the on-off valve and a hydraulic pump.
A pump pressure detector is provided, and the pump pressure detector
Pump when the pre-car is moving down at rated speed
Detecting pressure and limiting by the fully open position adjustment means
A control device for a hydraulic elevator, wherein the fully open position of the on-off valve is set . 2. Pressure from a hydraulic pump driven by an electric motor
Lifting the basket by supplying oil to the hydraulic jack
The hydraulic oil inside the hydraulic jack is regenerated by the electric motor
By pumping through the hydraulic pump
Lower the car and move the hydraulic jack and hydraulic pump
Open when the above car descends and stop
On-off valve that closes when stopped, and full opening of this on-off valve
Hydraulic elevator with fully open position adjusting means for regulating the position
The pump pressure between the on-off valve and the hydraulic pump
Provide a pump pressure detector,
Jack pressure to detect jack pressure between jack
Detectors are installed, and both pressure sensors
Pump pressure and jaw when
The pressure difference between these two pressures reaches a predetermined value.
The opening and closing restricted by the fully open position adjusting means so that
A control device for a hydraulic elevator, wherein a fully open position of a valve is set . Jack pressure detector