JPH1171073A - Hydraulic elevator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten activation delay and reduce activation shock, by holding an electro-magnetic operation hydraulic switch valve device at a neutral position during starting of a getting-on car, disconnecting oil passage connection between a hydraulic pump and a hydraulic jack, and rotating the hydraulic pump at high speed so that delivery amount exceeds equivalent leak amount. SOLUTION: In the condition that an electro-magnetic operation hydraulic switch valve device 19 is held at a neutral position during starting of a getting-on car 5, a hydraulic pump 8 is rotated at high speed to deliver oil of amount exceeding equivalent leak amount, the hydraulic pump 8 is decelerated to slow speed rotation where the getting-on car 5 acts at slow speed, and the electro-magnetic operation hydraulic switch valve device 19 is switched to a lifting-up position 19a or a lowering position 19b under valve opening condition. Thus, initial pressurizing operation during starting is completed in very short time. In addition, because both during lifting-up and lowering of the getting on car 5, the hydraulic pump 8 is decelerated to slow speed rotation at valve opening, activation shock and vibration of the getting-on car 5 can be suppressed.

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 for controlling supply and discharge of pressurized oil to and from a hydraulic jack for raising and lowering a car in a hydraulic elevator.

[0002]

2. Description of the Related Art In a method of controlling the speed of a car of a hydraulic elevator, the discharge amount of a hydraulic pump is variably controlled by the rotation speed of an electric motor. It is conventionally known that there is a rotation speed range in which the car does not start even if it is caused to start.

FIG. 3 shows a basic structure of a conventional general hydraulic elevator apparatus. This apparatus comprises a hydraulic jack 1 for driving a car 5 up and down, and a motor 7 controlled by an inverter 18. And this inverter motor 7
A hydraulic pump 8 driven by the hydraulic pump, an electromagnetically operated hydraulic on-off valve device 9 for opening and closing the oil passages 12 and 13 between the hydraulic pump 8 and the hydraulic jack 1 for opening and closing, and an excitation control device 17 thereof. , And a main controller 16 for controlling the overall operation thereof.

[0004] While the car 5 is stopped, the inverter motor 7 and the hydraulic pump 8 are stopped by the main control device 16, and the opening / closing valve device 9 is also in a non-excited state by a check valve (main check valve) shown in the drawing. It is in the cutoff position.
In this state, the oil pressure in the oil passage 12 on the hydraulic jack 1 side is higher than the pressure in the oil passage 13 on the hydraulic pump 8 side, and the main check valve of the on-off valve device 9 is pushed by this oil pressure to
13 is kept in a disconnected state.

When the car 5 is started in the ascending or descending direction, first, the main controller 16 controls the inverter motor 7 based on a control signal corresponding to the ascending or descending speed pattern.
To rotate forward. Although the hydraulic pump 8 is driven by the forward rotation of the inverter motor 7, the discharge flow rate of the hydraulic pump 8 does not rise at the same time as the forward rotation of the inverter motor 7 starts, and the hydraulic pump 8 starts rotating due to the above-described leakage. Until the amount equivalent to the leakage amount is compensated, the actual discharge amount is zero, and during this time, the car 5 cannot be started.

That is, as shown in FIG. 4 or 5, a start command is issued at time t0, whereby the hydraulic pump 8 is gradually accelerated to reach the rotation speed n1 at time t1, and at this time the pump discharge amount is increased. Is greater than the leakage amount, the car 5 is delayed from the arrival time t0 of the start command (t1).
-T0), and thereafter, the speed of extension (up) or contraction (down) of the hydraulic jack 1 is increased by forward / reverse rotation control of the hydraulic pump 8 according to the up / down speed pattern from the main controller 16. The car 5 is controlled and moves toward the destination floor.

By the way, if the pump rotation speed between times t0 and t1 is increased to make the discharge amount larger than the leakage amount, the start-up delay time of the car 5 can be shortened. When a large amount of pressure oil equivalent to or more than the amount of leakage is suddenly discharged from the pump 8, a high pressure is generated in the pump-side oil passage 13, and the main check valve of the electromagnetic on-off valve 9 in a non-excited state is quickly pushed open. Therefore, the starting shock and the vibration are generated in the car 5 as shown in FIG. Also, if the pump rotational speed is gradually increased during the period from time t0 to t1, the shock is reduced as shown in FIG. 5, but the start delay time is prolonged and the start of the car 5 is delayed. In addition, the operating time is prolonged, and the transportation efficiency is reduced.

As one measure for solving such a problem, Japanese Patent Publication No. 64-311 discloses a bias pattern signal for operating a motor at a speed low enough not to start a car and a running for running the car. By superimposing the pattern signal and controlling the driving of the motor, that is, the hydraulic pump, by the superimposed pattern signal, the amount of oil to the cylinder of the hydraulic jack is increased almost in synchronization with the start of the traveling pattern, thereby suppressing vibration. There is disclosed a hydraulic elevator control device that starts a smooth car.

[0009]

However, such a hydraulic elevator apparatus of this type is effective in preventing the occurrence of a start-up shock, but is effective until a start of a car actually starts after a start-up command is issued. The bias pattern signal for rotating the motor during the period is a low-speed signal in which the discharge amount of the hydraulic pump is suppressed to a flow rate that does not start the car. It takes a long time to replenish a large amount of oil equivalent to a large amount of leakage. Since the setting is made according to the amount, if the hydraulic pump changes or the leakage characteristics of the pump change due to aging due to use, the setting must be changed Narazu, such a start shock and thus the effect of suppressing the vibration changes change this setting, there is a disadvantage that adjustment becomes complicated when setting and maintenance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic elevator apparatus which can solve the above-mentioned drawbacks of the conventional hydraulic elevator apparatus, and which can easily achieve a reduction in starting delay and a reduction in starting shock with a simple adjustment. To provide.

[0011]

In order to achieve the above object, a hydraulic elevator apparatus according to the present invention is provided with a hydraulic jack for driving a car up and down, an electric motor whose forward / reverse variable speed is controlled, and a motor driven by the electric motor. A hydraulic pump, a solenoid operated hydraulic on / off valve device interposed in an oil passage between the hydraulic pump and the hydraulic jack, and a command signal supplied to the electric motor and the electromagnetically operated hydraulic on / off valve device to provide a hydraulic jack side. Control of opening the solenoid operated hydraulic on / off valve device under the condition that the pressure between the hydraulic pump and the hydraulic pump is almost equal, and controlling the operating speed of the hydraulic jack by controlling the supply and discharge flow rate of the hydraulic pump by forward and reverse variable speed control of the electric motor Device, the electromagnetically actuated hydraulic on-off valve device has a neutral position for disconnecting an oil path connection between a hydraulic pump and a hydraulic jack, The control device, when starting the car, rotates the hydraulic pump at a high speed while holding the electromagnetically operated hydraulic on-off valve device at the neutral position to discharge an amount of oil exceeding the leakage amount, and then starts the car with the hydraulic pump. Is characterized by including a start-up control means for opening the electromagnetically operated hydraulic on-off valve device under the above conditions after decelerating to a very low speed rotation at which the operation is performed at a low speed.

That is, in the hydraulic elevator apparatus of the present invention, when the car is started, the electromagnetically operated hydraulic on-off valve apparatus is first temporarily held at the neutral position, and the oil path connection between the hydraulic pump and the hydraulic jack is cut off. While the state is maintained, the hydraulic pump is rotated at a high speed so that the discharge amount exceeds the leakage amount. As a result, the pressure in the pump-side oil passage rises rapidly and exceeds the pressure in the jack-side oil passage,
The initial pressurizing operation at the time of startup is completed in a very short time. During this time, the car does not start moving because the electromagnetically operated hydraulic on-off valve device shuts off between the two oil passages. The setting of the pump rotation speed in the initial pressurization operation, that is, the discharge amount, can be set to an amount equivalent to the oil amount exceeding the predicted maximum leak amount in consideration of the service life of the used pump, so that only the start delay is reduced. It can be set taking into account, and there is little need to readjust if the pump changes or ages. Completion of the initial pressurizing operation can be controlled by, for example, a time limit using a timer.

After completion of the initial pressurizing operation, the hydraulic pump is immediately decelerated to a low speed rotation at which the car starts smoothly at a low speed. The setting of the deceleration may be set in accordance with the capacity of the hydraulic pump and the hydraulic jack in consideration of starting shock and vibration suppression. After the pump is decelerated to a very low speed, the solenoid operated hydraulic on-off valve device is opened under the condition that the valve opening conditions that the hydraulic jack side and the hydraulic pump side are almost equal are opened, and the hydraulic pump side and the hydraulic jack side are opened. The two oil passages are in a connected state. The detection of the establishment of the valve opening condition at this time is performed by generating a detection signal when the pressure in the pump-side oil passage becomes substantially equal to the pressure in the jack-side oil passage by an appropriate pressure detector such as a differential pressure switch. As a result, the flow control means sends an excitation signal to the electromagnetically operated hydraulic on-off valve to open the valve. With this valve opening, hydraulic oil is sent from the hydraulic pump side to the hydraulic jack side when the car rises, and pressure oil is sent in the opposite direction when the car lowers, but when the car opens, the hydraulic pump rotates at a very low speed. Since the vehicle is decelerated, the occurrence of the starting shock and vibration of the car is suppressed, and the car starts moving smoothly.

[0014]

FIG. 1 is a circuit diagram showing an example of an embodiment of a hydraulic elevator apparatus according to the present invention. This device comprises a hydraulic jack 1 for driving up and down the car 5, a motor 7 driven by an inverter device 18, a hydraulic pump 8 variably driven forward and reverse by the inverter motor 7, a hydraulic pump 8 and a hydraulic jack 1 and an electromagnetically controlled hydraulic on-off valve device 19 for opening and closing the oil passages 12 and 13 to and from the oil passages 12 and 13 and its excitation control device 1
7 and a main controller 16 for controlling the overall operation of these. In the drawing, reference numeral 2 denotes a ram of the hydraulic jack 1, reference numeral 3 denotes a pulley pivotally supported at the tip of the ram 2, reference numeral 4 denotes a main rope fixed at one end 6 and lifts and lowers the car 5 at the other end, and reference numeral 11 denotes an oil reservoir. , 14 are oil passages connecting between the pump 8 and the reservoir.

The solenoid-operated hydraulic on-off valve device 19 is a two-port, three-position valve with a double-sided solenoid device of a spring center type. When the solenoid device A is excited, it takes the ascending position 19a and when the solenoid device B is excited. Takes the descending position 19b, and holds the neutral position 19c when both solenoid devices A and B are not excited. In the neutral position 19c, the electromagnetically operated oil passage on-off valve device 19 shuts off the flow between the oil passages 12 and 13 in both directions as indicated by the oil pressure symbol shown in the figure.

The main controller 16 receives a signal generated by operating an operation button on an operation panel provided in the car 5 or on each floor and a signal from a car detection limit switch on each floor, and receives a start signal and a stop signal. Speed control means for giving a PWM control signal of a preset speed pattern to the inverter device 18, valve control means for giving the excitation control device 17 a control signal for opening and closing the opening and closing valve device 19, When the hydraulic pump 8 is started, the hydraulic pump 8 is rotated at a high speed while the electromagnetically operated hydraulic on-off valve device 19 is held at the neutral position 19c to discharge an amount of oil exceeding the amount corresponding to the leakage amount. Then, the electromagnetically operated hydraulic on-off valve device 19 is switched to the ascending position 19a or the descending position 19b under the aforementioned valve opening conditions. And a start control means for changing.

The pressure in the oil passages 12 and 13 is monitored by a differential pressure switch 20.
Is generated when the pressure on the oil passage 13 side is substantially equal to the pressure on the oil passage 12 side, and the main control device 16 gives a valve opening command to the excitation control device 17 at the rise of the detected output. . Of course, instead of this differential pressure switch 20,
It is also possible to provide a pressure detector in each of the oil passages 12 and 13 and compare a detection value of each pressure detector with a comparator in the main control device 16 to give a valve opening command. As another method, a valve opening command and a valve closing command are given to the excitation control device 17 by a signal of a limit switch of each floor and a timer function in the main control device 16 without using a differential pressure switch or a pressure detector. It may be.

In the above configuration, while the car 5 is stopped, the main controller 16 controls the inverter motor 7.
And the hydraulic pump 8 are stopped, and the on-off valve device 9 is also held in the neutral position 19c in a non-excited state as shown in the figure, so that the oil passage 12 on the hydraulic jack 1 side and the oil passage 13 on the hydraulic pump 8 side are connected. Communication is blocked.

When one of the operation buttons is operated, the main controller 16 recognizes the position of the operation button (the operation button of the car and each floor) operated together with the position of the car 5 at that time. And generates an activation signal. As a result, the main control unit 16 starts the initial pressurizing control operation, and based on the generation of the start signal at time t0, first gives the next command signal to the excitation control unit 17 for both solenoid devices, as shown in FIG. The control command is sent to keep the motor 7 in the non-excited state until the motor 7 is turned off, and at the same time, the control command is sent to the inverter device 18 so as to rotate the motor 7 forward at a high speed set speed for a predetermined time period. This high-speed rotation speed is a speed exceeding the rotation speed n1 corresponding to the leakage amount described with reference to FIG.

The hydraulic pump 8 driven at a high speed by the motor 7 at the start of the initial pressurizing operation discharges the pressure oil to the oil passage 13 with a discharge amount exceeding the maximum leakage amount. Pressure rises rapidly and jack-side oil passage 1
2, and the initial pressurizing operation at the time of startup is completed in a very short time. During this time, the car 5 does not start moving because the electromagnetically operated hydraulic on-off valve device 19 shuts off between the two oil passages.

When the time period of the high-speed rotation ends and time t21 is reached, main controller 16 sends a deceleration command to inverter device 18, whereby motor 7 is immediately decelerated to the preset fine-speed rotation. This very low rotation speed corresponds to the hydraulic pump 8
It is needless to say that the car 5 is at a speed level (approximately equivalent to the rotation speed n1) at which the car 5 can be smoothly started at a very low speed by the flow control.

After the pump 8 has been decelerated to a very low speed, if the differential pressure switch 20 detects that the valve opening condition that the pressures in the hydraulic jack side oil passage 12 and the hydraulic pump side oil passage 13 are substantially equal is satisfied, the main operation is started. The control device 16 is an excitation control device 17
To the valve opening command. In this case, if the time until the pressure of the hydraulic pump side oil passage 13 becomes equal to or less than the pressure of the hydraulic jack side oil passage 12 with the deceleration of the pump 8 is predetermined as a characteristic value specific to the system, A fixed time period from the start of deceleration of the motor 7 may be given by the timer function of the main control device 16 to give a valve opening command to the excitation control device 17. As a result, the electromagnetically operated hydraulic on-off valve device 19 is opened, and the two hydraulic paths on the hydraulic pump side and the hydraulic jack side are connected.

The opening / closing valve device 19 is opened in accordance with an ascending command or a descending command recognized by the main controller 16 based on the operation button operated at that time and the position information of the car 5. The solenoid device A is energized to take the ascending position 19a, and if the descent command is issued, the solenoid device B is energized to take the enclosing position 19b.

With this valve opening, when the car 5 rises, hydraulic oil is sent from the hydraulic pump 8 to the hydraulic jack 1, and when the car 5 descends, pressure oil is sent in the opposite direction. Occasionally, the hydraulic pump 8 is decelerated to a low speed, so that the starting shock and vibration of the car 5 are suppressed, and the car 5 starts to move smoothly. Thereafter, the main controller 16 controls the speed of the motor 7 via the inverter device 18 in accordance with a preset ascending or descending speed pattern, whereby the discharge amount of the hydraulic pump 8 smoothly changes according to this speed pattern. .
FIG. 2 shows a case of a rising pattern.

When raising the car 5, the main controller 16 controls the hydraulic pump 8 at a speed based on the set speed pattern.
Is rotated forward, and the solenoid A of the on-off valve device 19 is excited. As a result, the opening / closing valve device 19 is at the raised position 19a, and the check valve operation causes pressure oil to be sent from the hydraulic pump side oil passage 13 to the hydraulic jack side oil passage 12.

Conversely, when the car 5 is lowered,
The main controller 16 controls the speed (flow rate) by switching the hydraulic pump 8 from normal rotation to reverse rotation at a speed based on the set speed pattern, and excites the solenoid B of the on-off valve device 19. As a result, the on-off valve device 19 is at the lowered position 19b, and pressure oil flows from the hydraulic jack side oil passage 12 to the hydraulic pump side oil passage 13 by the reverse check valve operation.

When the car 5 approaches the destination floor, a stop signal from a limit switch provided on each floor is given to the main controller 16, whereby the main controller 16 operates the hydraulic pump 8 according to a speed pattern of a predetermined deceleration rate. (Time t23). Thereby, the check valve of the on-off valve device 19 gradually closes the opening in accordance with the differential pressure generated between the upstream side and the downstream side of the on-off valve device 19 according to the deceleration rate of the speed pattern, and the car No. 5 is decelerated at a speed corresponding to the closing speed and stops without a shock. When the differential pressure between the upstream side and the downstream side disappears, the differential pressure switch 20 generates an output, whereby the main controller 16 shuts off the excitation to the on-off valve device 19 and returns to the neutral position 19c. In this embodiment, the signal from the differential pressure switch 20 and the main control unit are used by the main control unit 16 to return the on-off valve device 9 to the neutral position while the motor 7 is rotating forward after the car 5 is stopped. 16 uses the timer function, but instead of using the signal from the differential pressure switch 20, the car stops at the target floor by detecting the signal from the limit switch arranged on each floor with the main controller 16. At this point, the timer function of the main control device 16 may be operated to perform the operation of returning the on-off valve device 9 to the neutral position.

[0028]

As described above, in the hydraulic elevator according to the present invention, when the car is started, the electromagnetically operated hydraulic on-off valve device is first temporarily held in the neutral position, and the oil between the hydraulic pump and the hydraulic jack is temporarily stopped. Since the hydraulic pump is rotated at a high speed so that the discharge rate exceeds the amount equivalent to the leakage amount while the line connection is maintained in the disconnected state, the pressure in the pump-side oil line rises rapidly and the jack-side oil line The pressure is equal to or higher than the pressure, and the initial pressurizing operation at the time of startup is completed in an extremely short time. During this time, the electromagnetically operated hydraulic on-off valve device shuts off between the two oil passages, so that the car does not start moving, and the setting of the pump rotation speed in the initial pressurization operation, that is, the discharge amount, determines the useful life of the used pump. It can be set to take into account the shortening of the start-up delay, since it can be set to an amount equivalent to the oil amount exceeding the maximum leak amount that is expected to be taken into account, even if the pump changes or aging occurs. There is little need to adjust.

After completion of the initial pressurizing operation, the hydraulic pump is immediately decelerated to a low-speed rotation at which the car starts smoothly at a low speed. Can be started,
In addition, since the setting of the deceleration may be set according to the capacity of the hydraulic pump and the hydraulic jack in consideration of the starting shock and the vibration suppression, the adjustment is easy.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating an example of an embodiment of a hydraulic elevator device according to the present invention.

FIG. 2 is an operation explanatory diagram of the embodiment apparatus shown in FIG. 1;

FIG. 3 is a circuit diagram showing an example of a conventional hydraulic elevator device.

FIG. 4 is an operation explanatory diagram of a conventional hydraulic elevator apparatus.

FIG. 5 is another operation explanatory diagram of the conventional hydraulic elevator apparatus.

[Explanation of symbols]

 1: Hydraulic jack 5: Riding car 7: Motor 8: Hydraulic pump 12: Hydraulic jack side oil path 13: Hydraulic pump side oil path 16: Main control device 17: Excitation control device 18: Inverter device 19: Electromagnetically operated hydraulic open / close valve Device 19a: Up position 19b: Down position 19c: Neutral position 20: Differential pressure switch

Claims (1)

[Claims] 1. A hydraulic jack for driving a car up and down, an electric motor controlled by forward and reverse variable speed control, a hydraulic pump driven by the electric motor, and an oil passage interposed between the hydraulic pump and the hydraulic jack. Command signal to the electromagnetically operated hydraulic on / off valve device, the electric motor and the electromagnetically operated hydraulic on / off valve device so that the pressure on the hydraulic jack side and the pressure on the hydraulic pump side become substantially equal to each other. A control device for controlling the operating speed of the hydraulic jack by controlling the supply and discharge flow rate of the hydraulic pump by opening and closing the valve device and controlling the forward and reverse variable speeds of the electric motor, wherein the electromagnetically operated hydraulic on-off valve device comprises a hydraulic pump A neutral position for interrupting an oil passage connection between the hydraulic jack and the hydraulic jack, wherein the controller neutralizes the electromagnetically operated hydraulic on-off valve device when the car is started. The hydraulic pump is rotated at a high speed while maintaining the position and discharges an amount of oil exceeding the amount equivalent to the leakage amount, and then the hydraulic pump is decelerated to a very low speed at which the car operates at a very low speed. A hydraulic elevator apparatus comprising activation control means for opening an on-off valve device.