JPH11343077A - Control device for hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct a landing error due to the entrance and exit of passengers after landing or oil leaks with high accuracy, and prolong the working life of a device for correcting the landing error. SOLUTION: In a control device for hydraulic elevators, when there is a landing error within a specified value when the door is open, the control device 10 performs control through a second control valve 20 so that pressurized oil is supplied froma pressure accumulator 21 to a hydraulic cylinder 3, or the pressurized oil is discharged from the hydraulic cylinder 3 to a pressure-oil tank 12. When there is a landing error when the door is closed, the control device performs control through a first control valve 4 by a first pump 5 so that the pressurized oil is supplied from the pressure-oil tank 12 to the hydraulic cylinder 3, or the pressurized oil is discharged from the hydraulic cylinder 3 to the pressure-oil tank 12 by the first pump 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator control device, and more particularly, to a hydraulic elevator control device for correcting a landing error due to a passenger entering or exiting after landing and an oil leak.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. 4-41375,
Japanese Unexamined Patent Publication No. Hei 9-142748 discloses that, when a car floats and sinks due to passengers entering and exiting the car after the elevator stops, the car is quickly raised and lowered by a high-pressure fluid from the accumulator through the control valve to the floor level of the elevator. It is disclosed to refill the fluid cylinder to correct the car position.

[0003]

According to the above-mentioned prior art apparatus, when a car floats and sinks due to passengers entering and leaving the car after landing on the elevator, the main control is to perform position correction for promptly correcting the floor level of the elevator. When using a control valve other than a valve and an accumulator (hereinafter, abbreviated as precision inching), the re-adjustment performance is good, but the control valve and the accumulator have a short life and the re-adjustment frequency is high. Causes a failure. For example, at night, when an elevator is on standby, an oil leak occurs in the hydraulic elevator, and the car sinks. If floor re-alignment is performed by the above-described precision inching in order to correct such a landing error, the number of times of activation is increased, and the life is immediately shortened.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to accurately correct a landing error caused by a passenger entering or exiting after landing or an oil leak, and to extend the life of the device. An object of the present invention is to provide a control device for a hydraulic elevator that has been made possible.

[0005]

The present invention employs the following means in order to solve the above-mentioned problems.

[0006] A hydraulic cylinder for raising and lowering the car via a plunger, a first hydraulic pump for supplying and discharging pressurized oil from a hydraulic tank to the hydraulic cylinder, and a first pump controlled when the car is raised and lowered, A first control valve provided between the hydraulic cylinder, a first electric motor that drives the first hydraulic pump, an accumulator that accumulates high-pressure oil, and a pressure oil that is supplied to the accumulator. A second pump, a second control valve which is controlled when the landing error is corrected, and is provided between the accumulator and the hydraulic cylinder, the first and second electric motors, and the first and second electric motors. A control device for controlling the elevator by controlling the second control valve, wherein the control device, when there is a landing error within a predetermined value when the door is opened, the second
Control pressure is supplied from the accumulator to the hydraulic cylinder or discharged from the hydraulic cylinder to the hydraulic tank via the control valve, and landing within a predetermined value when the door is closed. When there is an error, a pressure oil is supplied from the oil tank to the hydraulic cylinder by the first pump or discharged from the hydraulic cylinder to the oil tank by the first pump via the first control valve. Control as described above.

In the hydraulic elevator control device, when there is a landing error within a second predetermined value that is smaller than the first predetermined value, the control device may operate through the second control valve. Controlling the hydraulic oil to be supplied from the accumulator to the hydraulic cylinder or the hydraulic oil to be discharged from the hydraulic cylinder to the hydraulic tank, and a landing error smaller than a first predetermined value and larger than a second predetermined value. When there is
Via the first control valve, controlling the supply of pressurized oil from the oil tank to the hydraulic cylinder by a first pump or the discharge from the hydraulic cylinder to the oil tank by the first pump. Features.

In the hydraulic elevator control apparatus, when the door is opened, if there is a landing error within a second predetermined value smaller than the first predetermined value,
Via the second control valve, control is performed so as to supply pressure oil from the accumulator to the hydraulic cylinder or to discharge pressure oil from the hydraulic cylinder to the hydraulic tank. If there is a landing error within a second predetermined value smaller than a predetermined value or a landing error within the first predetermined value when the door is closed, a first error is received via the first control valve.
The hydraulic pump is controlled so that pressure oil is supplied from the oil tank to the hydraulic cylinder or discharged from the hydraulic cylinder to the oil tank by the first pump.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an overall configuration diagram of a control device for a hydraulic elevator according to the present embodiment. In the figure, 1
Is a car, 2 is a counterweight, 3 is a hydraulic jack,
4 is a control valve which is controlled by a control device and controls the supply and discharge of hydraulic oil to and from a hydraulic cylinder by a first pump, 5 is a first pump driven by a first electric motor, and 6 is rotation control by an inverter control device The first electric motor,
7 is an inverter control device controlled by a command from the control device, 8 and 9 are ropes, 10 is mainly constituted by a microcomputer, inputs various detection signals from various parts of the elevator, and has a first motor and a second motor. , A control device that outputs various control commands to the first control valve, the second control valve, and the like to control the elevator, 11 is a rotary encoder,
12 is an oil tank, 13 is a power supply, 20 is a lifting coil 2
01 and a descending coil 202, and each coil 20
A second control valve 21 composed of a proportional solenoid valve for controlling the flow rate of pressure oil according to the magnitude of the current flowing through
, A pressure switch, 22 is a pressure switch, 23 is a contactor that is controlled to open and close by a command from the control device 10, 24 is a second pump driven by a second electric motor, 25 is a contactor 2
The second motor 26 driven at the time of closing the circuit 3 is a check valve.

The car 1 is connected to pulleys 101, 102, 10 by a rope 8 having one end fixed to the ground.
It is roped through 3, 104, 105. The hydraulic jack 3 is connected to the counterweight 2 by ropes 9 via pulleys 107 and 106. In this example, a hydraulic elevator having a counterweight has been described, but a general hydraulic elevator having no counterweight or another type may be used. The position and speed of the car 1 are detected by transmitting output pulses detected from the rotary encoder 11 synchronized with the movement of the car 1 to the control device 10.

The speed control from the start of the elevator to immediately before landing is mainly performed by controlling the first motor 6 by supplying a drive signal from the control device 10 to the inverter control device 7.
The first electric motor 6 is a first pump 5 directly connected to this electric motor.
Drive. The driven first pump 5 supplies or discharges pressure oil from the oil tank 12 to the hydraulic jack 3 via the main control valve 4, and raises and lowers the car 1. In order to improve the controllability of the inverter control device 7, a rotary encoder (not shown) is attached to the first electric motor 6, so that the speed of the electric motor can be accurately detected.

The pressure switch 22 is provided to constantly detect the oil pressure of the accumulator 21, and transmits a detection signal to the control device 10 when the oil pressure becomes equal to or less than a preset oil pressure.
The control device 10 issues a closing command to the contactor 23 based on the detection signal, and causes the power source 13 to supply power to the second electric motor 25. When the second motor is driven, the second pump 24 directly connected to the second motor 25 is also driven to store the pressure oil in the pressure accumulator 21 via the check valve 26. When the pressure of the accumulator 21 reaches a predetermined value, the pressure switch 22 detects
0 issues an open command to the contactor 23.

FIG. 2 is a diagram showing an example of a relay circuit provided in the control device 10 shown in FIG. 1 and for creating a speed command for the second control valve 20. This relay circuit is composed of an ascending and restoring relay circuit when the car sinks and a descending and restoring relay circuit when the car ascends.

In the figure, VR, VR1 and VR2 are resistors, 11L is a normally open relay for ascending, 12L is a normally open relay for descending, 11LL is a normally closed relay for ascending, 12LL is a normally closed relay for descending, 201 and 202. Are the ascending coil and the descending coil shown in FIG. 1, respectively.

Here, for example, when the car 1 sinks and it becomes necessary to raise the floor again, the relay 11L receives a command and closes the normally open contact, and the resistance VR, the normally open relay 11L for raising, the rising Normally closed relay 11LL, ascending coil 20
Current flows through 1 and car 1 begins to rise at a very slow speed. When the car 1 ascends and the landing error is reduced to a level below a preset level, the relay 11L
L is opened upon receiving a command, a small current is supplied to the ascending coil 201 via the resistor VR, the normally open relay 11L, and the resistor VR1, and the flow rate is further reduced to reduce the speed, thereby improving the accuracy of the landing control. I am trying to raise it.

Next, a description will be given of a correction of a landing error due to an oil leak or an entry / exit of a passenger after landing in the elevator door control device according to the present embodiment.

If the elevator lands on the floor to be stopped, the door opens and the passenger gets on and off, and the car 1 sinks or floats due to the flow of hydraulic pressure oil, causing a landing error, Since the passenger enters and exits the car 1, it is necessary to quickly and accurately re-adjust the floor. Here, so-called precision inching control for that purpose is performed. For example, when it is detected that the car 1 has settled, the hydraulic pump is driven via the second control valve 20 from the accumulator 21 in which the high pressure oil is constantly stored by driving the second pump 24. 3
Is supplied to the car 1 and the landing of the car 1 is controlled at low speed and with high accuracy. Conversely, when it is detected that the car 1 has floated, the hydraulic oil in the hydraulic jack 3 is discharged to the tank 12 via the second control valve 20 to control the car 1 to land at a very low speed and with high accuracy. I do.

If the car 1 sinks due to oil pressure leaks from the hydraulic system and a landing error occurs with the door closed at night or the like, the inverter control unit 7 Upon receiving the command, the first electric motor 6 and the first pump 5 are controlled to rotate at a low speed, thereby performing re-alignment. The re-floating control in this case is less responsive than the precision inching control described above, but there is no problem since there are no passengers with the door closed.

Next, a processing procedure relating to a landing error correction processing by the control device 10 according to the present embodiment will be described with reference to a flowchart shown in FIG.

In step 11, it is determined whether a landing error within a predetermined value has occurred. If the landing error exceeds a predetermined value, the process proceeds to another process in step 12. If a landing error within a predetermined value occurs, it is determined in step 13 whether the landing error has occurred while the door is open. In the case of YES, in step 14, the landing error is corrected by the precision inching control, and the landing is performed again.
If NO, the first control valve 4,
The landing error is corrected by operation control of the first pump 5 and the like, and re-landing is performed. The predetermined value may be, for example, the length of a door zone in which the door is permitted to be opened if the car has landed and is within a predetermined landing error.

As described above, when a landing error within a predetermined value occurs while the door is open, that is, when a passenger is getting on and off the car 1, precise inching control with good performance is performed. If a landing error within a predetermined value occurs due to oil leakage or the like while the door is closed, it is considered that there are no passengers, so the inverter control device 7, the first electric motor 6, The first pump 5 and the first control valve control the landing of the car 1 at a very low speed.

FIG. 4 shows a control device 10 according to this embodiment.
9 is a flowchart showing a processing procedure relating to another landing error correction processing by the above.

In step 21, it is determined whether a landing error has occurred within a predetermined value D1, for example, within the length of the door zone. If the landing error exceeds the predetermined value D1, the process proceeds to another process of step S22. If an implantation error within the predetermined value D1 has occurred, it is determined in step 23 whether the implantation error is larger than an arbitrary predetermined value D2 smaller than the predetermined value D1. Landing error is a predetermined value D
If it is smaller than 2, the landing error is corrected in step 24 by the precision inching control and the landing is performed again. If the landing error is larger than the predetermined value D2, the landing error is corrected in step 25 by controlling the operation of the first control valve 4, the first pump 5, and the like. As described above, when the landing error is within the predetermined value D1 of the door zone or the like, and when the landing error is smaller than the predetermined value D2, the precise inching control is performed to perform the landing again, and the landing error is reduced. When the value is within the predetermined value D1 and is larger than the predetermined value D2, the landing error is corrected by the operation control of the first control valve 4, the first pump 5, and the like, and the landing error is corrected by the precision inching control and the operation control. By using together, it is possible to extend the life of the device related to the precision inching control.

FIG. 5 shows a control device 10 according to this embodiment.
9 is a flowchart showing a processing procedure related to another landing error correction processing by the present invention.

In step 31, it is determined whether a landing error has occurred within a predetermined value D1, for example, within the length of the door zone. If the landing error exceeds the predetermined value D1, the process shifts to another process of step S32. If a landing error within a predetermined value has occurred, it is determined in step 33 whether the landing error has occurred while the door is open. YES
In step 34, it is further determined in step 34 whether the landing error is larger than an arbitrary predetermined value D2 smaller than the predetermined value D1. If the landing error is smaller than the predetermined value D2, in step 35, the landing error is corrected by the precision inching control, and the landing is performed again. If the landing error is larger than the predetermined value D2, and if NO in step 33
In step 36, the first control valve 4, the first
The landing error is corrected by the operation control of the pump 5 and the like.

As described above, when the landing error is within the predetermined value D1 of the door zone or the like, the landing error is corrected by the operation control when the door is closed, and the precise inching control and the operation are performed when the door is opened. By using the correction of the landing error by the control together, it is possible to extend the life of the device related to the precision inching control as a whole.

[0028]

As described above, according to the present invention, when there is a landing error within a predetermined value when the door is opened, the control device transmits the landing error from the accumulator through the second control valve. Controlling the supply of hydraulic oil to the hydraulic cylinder or the discharge of hydraulic oil from the hydraulic cylinder to the hydraulic tank, and when there is a landing error within a predetermined value when the door is closed, through the first control valve, Then, control is performed such that pressure oil is supplied from the oil tank to the hydraulic cylinder by the first pump or discharged from the hydraulic cylinder to the oil tank by the first pump.
It is possible to accurately correct a landing error due to a passenger entering or leaving after landing or an oil leak, and to extend the life of a device that performs precise inching control.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a control device for a hydraulic elevator according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a relay circuit for creating a speed command for precision inching control in the control device 10 shown in FIG.

FIG. 3 is a flowchart showing a processing procedure relating to a landing error correction process of the hydraulic elevator control device according to the embodiment.

FIG. 4 is a flowchart showing a processing procedure relating to another correction processing of the landing error of the hydraulic elevator control device according to the embodiment.

FIG. 5 is a flowchart illustrating a processing procedure relating to another correction processing of the landing error of the hydraulic elevator control device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riding car 2 Counterweight 3 Hydraulic jack 4 1st control valve 5 1st pump 6 1st electric motor 7 Inverter control device 10 Control device 20 2nd control valve 201 Coil for raising 202 Coil for descent 21 Stator 22 Pressure switch 23 contactor 24 second pump 25 second motor

Claims (3)

[Claims] 1. A hydraulic cylinder for raising and lowering a car via a plunger, a first hydraulic pump for supplying and discharging pressurized oil from a hydraulic tank to the hydraulic cylinder, and a first hydraulic pump controlled when the car is raised and lowered, A first control valve provided between a pump and the hydraulic cylinder, a first electric motor for driving the first hydraulic pump, an accumulator for accumulating high-pressure oil, and pressurized oil for the accumulator. A second pump to be supplied, a second control valve which is controlled when the landing error is corrected, and is provided between the accumulator and the hydraulic cylinder, the first and second electric motors, and the first pump. And a control device for controlling the elevator by controlling the second control valve, the control device, when there is a landing error within a predetermined value when the door is opened, the Via the second control valve While controlling to supply pressure oil to the hydraulic cylinder from the accumulator or to discharge pressure oil from the hydraulic cylinder to the hydraulic tank, when there is a landing error within a predetermined value when the door is closed, It is characterized in that control is performed such that pressure oil is supplied from the oil tank to the hydraulic cylinder by a first pump or discharged from the hydraulic cylinder to the oil tank by the first pump via a first control valve. Hydraulic elevator control device. 2. A hydraulic cylinder for raising and lowering a car via a plunger, a first hydraulic pump for supplying and discharging pressurized oil from a hydraulic tank to the hydraulic cylinder, and a first hydraulic pump controlled when the car is raised and lowered. A first control valve provided between a pump and the hydraulic cylinder, a first electric motor for driving the first hydraulic pump, an accumulator for accumulating high-pressure oil, and pressurized oil for the accumulator. A second pump to be supplied, a second control valve which is controlled when the landing error is corrected, and is provided between the accumulator and the hydraulic cylinder, the first and second electric motors, and the first pump. And a control device for controlling the elevator by controlling a second control valve, wherein the control device has a landing error within a second predetermined value smaller than the first predetermined value. Sometimes, the second Via a control valve, control is performed so as to supply hydraulic oil from the accumulator to the hydraulic cylinder or to discharge hydraulic oil from the hydraulic cylinder to the hydraulic tank, and a second predetermined value smaller than the first predetermined value If there is a larger landing error, the first
Via the control valve, the hydraulic pump is controlled to supply hydraulic oil from the oil tank to the hydraulic cylinder by the first pump or to be discharged from the hydraulic cylinder to the oil tank by the first pump. Hydraulic elevator control device. 3. A hydraulic cylinder for raising and lowering a car via a plunger, a first hydraulic pump for supplying and discharging pressure oil from a hydraulic tank to the hydraulic cylinder, and a first hydraulic pump controlled when the car is raised and lowered. A first control valve provided between a pump and the hydraulic cylinder, a first electric motor for driving the first hydraulic pump, an accumulator for accumulating high-pressure oil, and pressurized oil for the accumulator. A second pump to be supplied, a second control valve which is controlled when the landing error is corrected, and is provided between the accumulator and the hydraulic cylinder, the first and second electric motors, and the first pump. And a control device for controlling the elevator by controlling a second control valve, wherein the control device has a second predetermined value smaller than the first predetermined value when the door is opened. When there is a landing error Via the second control valve, control to supply hydraulic oil from the accumulator to the hydraulic cylinder or discharge hydraulic oil from the hydraulic cylinder to the hydraulic tank, When there is a landing error smaller than the predetermined value and larger than the second predetermined value, or when there is a landing error within the first predetermined value when the door is closed, the first control valve is used to perform the first A control device for a hydraulic elevator, wherein control is performed such that pressure oil is supplied from the oil tank to the hydraulic cylinder by a pump or discharged from the hydraulic cylinder to the oil tank by the first pump.