JP2872820B2 - 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 hydraulic elevator control device which is driven via a hydraulic jack by variably controlling a hydraulic oil discharge amount of a hydraulic pump, and more particularly to a ride comfort by suppressing vibration during landing. The present invention relates to a hydraulic elevator control device in which is improved.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional hydraulic elevator control device described in, for example, Japanese Patent Laid-Open No. 60-71474. In the figure, 1 is a cylinder buried in a pit of a hoistway, 2 is a pressurized oil filled in a cylinder 1, and 3 is a vertically movable plunger supported by a pressurized oil 2, and these constitute a hydraulic jack. ing. Reference numeral 4 denotes a deflecting wheel rotatably provided on the top of the plunger 3. Reference numeral 5 denotes a rope that is hung on the deflecting wheel 4 and has one end fixed to a pit. Reference numeral 6 denotes a vertically movable car attached to the other end of the rope 5. .

[0003] 7 is a pressure oil 2 transmitted and received between the cylinder 1
And 8 is a conduit for sending the pressurized oil 2 between the cylinder 1 and the oil tank 7. Reference numeral 9 denotes an electromagnetic switching valve provided in the path of the conduit 8, which always functions as a check valve, prevents the flow of the pressurized oil 2 from the cylinder 1 to the oil tank 7, and reverses the direction by the urging of the electromagnetic coil. Also becomes conductive. Reference numeral 10 denotes a hydraulic pump that reciprocates between the electromagnetic switching valve 7 and the oil tank 7 to send and receive the pressure oil 2.

[0004] Reference numeral 14 denotes a three-phase induction motor that applies a driving torque by rotating the hydraulic pump 10, 15 denotes a speed detector that detects the rotation speed of the induction motor 14, 16 denotes a three-phase AC power supply, and 17 denotes a three-phase AC power supply 16. A converter for converting the AC voltage from the DC to DC voltage, a capacitor 18 for smoothing the DC voltage output from the converter 17, a DC voltage 19 across the capacitor 18 is applied, and the induction motor 14 is driven by VVVF (variable voltage variable). And an inverter 20 for controlling the inverter 19 in accordance with the car traveling pattern V.

Next, the operation of the conventional hydraulic elevator control device shown in FIG. 2 will be described. Normally, electromagnetic switching valve 9
Is deenergized while the car 6 is stopped and acts as a check valve,
When the car 6 moves up and down, it is urged to be in a conductive state. During the raising and lowering of the car 6, the speed controller 20 drives the inverter 19 according to the car running pattern V, and controls the amount of the pressure oil 2 in the cylinder 1 which is transferred via the induction motor 14 and the hydraulic pump 10. . The amount of the pressure oil 2 in the cylinder 1 corresponds to the amount of the plunger 3 that moves up and down the car 6.

When the car 6 moves up and down by raising and lowering the plunger 3 of the hydraulic jack, and the car 6 reaches the target floor,
The car running pattern V becomes 0. As a result, the induction motor
As the number of rotations of 14 decreases, the pressure on the hydraulic pump 7 side decreases accordingly.

As described above, when the car 6 arrives on the target floor, the electromagnetic switching valve 9 is closed to act as a check valve.
However, since the pressure (pump pressure) on the hydraulic pump 10 side is lower than the pressure on the hydraulic jack side (jack pressure), the car 6 descends shortly before the electromagnetic switching valve 9 closes, causing a large stop shock. Vibration occurs and ride comfort deteriorates.

[0008]

As described above, in the conventional hydraulic elevator control apparatus, when the car 6 is landed, the car 6 descends before the electromagnetic switching valve 9 is closed, so that vibration occurs. At the same time, there is a problem that the amount of deviation between the landing on the target floor and the threshold of the car 6 becomes large, and the ride comfort is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a hydraulic pressure in which the lowering of a car is suppressed to improve ride comfort by applying a pump pressure corresponding to a jack pressure at the time of landing. An object is to obtain an elevator control device.

[0010]

A hydraulic elevator control device according to the present invention includes a pressure sensor disposed on a hydraulic jack side of an electromagnetic switching valve to detect jack pressure, and a pressure sensor disposed on a hydraulic pump side of the electromagnetic switching valve. A pressure sensor for detecting a pump pressure and a pressure controller for inputting a compensation torque command for reducing a deviation between the jack pressure and the pump pressure to zero to a speed controller are provided.

[0011]

According to the present invention, each time the car lands on the target floor and the elevator stops, a compensation torque is applied to the hydraulic pump so that the pump pressure detected by the pressure sensor becomes equal to the jack pressure. Close the electromagnetic switching valve while driving. Therefore, before the electromagnetic switching valve closes, the pump pressure is feedback-controlled with the jack pressure at the time of landing as the target value, so that the car can be prevented from lowering after landing and the stop shock and vibration are greatly reduced. At the same time, the amount of displacement between the landing and the car threshold at the time of stoppage is reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention.
20A corresponds to the speed controller 20, 1 to 10 and 14 to 19
Is the same as described above. Reference numerals 21 and 22 denote pressure sensors for detecting the pressures P ₁ and P ₂ in the conduit 8 located at both ends of the electromagnetic switching valve 9, and one pressure sensor 21 is provided on the cylinder 1 side of the electromagnetic switching valve 9, and the other. The pressure sensor 22 is provided on the hydraulic pump 10 side of the electromagnetic switching valve 9. 24 jack pressure P ₁ and the compensation torque command C the speed controller 20A based on the pump pressure P ₂ detected by the pressure sensor 21 and 22
Is a pressure controller to be input.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be described. As described above, when the car 6 arrives at the target floor in response to the call, the car traveling pattern V becomes 0, and the car 6 stops. At this time, the pressure controller 24
Is the jack pressure P obtained from each of the pressure sensors 21 and 22.
Calculate deviation ΔP (= P ₁ −P ₂ ) between ₁ and pump pressure P ₂ ,
A compensation torque command C for reducing the pressure deviation ΔP to zero is generated and input to the speed controller 20A.

Therefore, the speed controller 20A drives the inverter 19 based on the compensation torque command C. This allows
The compensation torque generated induction motor 14 is driven, the hydraulic pump 10 generates a pump pressure P ₂ such as to match the jack pressure P _1, the car 6 is prevented from falling.

At this time, the pressure controller 24 determines the pressure deviation ΔP
= 0 and is adjusted automatically compensated torque command C to the pump pressure P ₂ is stably controlled so as to match the jack pressure P _1. Then, when P ₁ = P ₂ , the electromagnetic switching valve 9 is closed, so that the plunger 3 of the hydraulic jack does not move at all and the car 6 does not move.

[0016] Thus, the jack pressure P ₁ fed back controls the pump pressure P ₂ as the target value at the time of implantation, after such basket 6 does not move, stop holding the car 6 by closing the electromagnetic switching valve 9 I do. As a result, the stop shock of the car 6 and the vibration accompanying the stop shock can be prevented, and the shift amount between the landing and the car threshold can be reduced.

[0017]

As described above, according to the present invention, a pressure sensor is disposed on the hydraulic jack side of the electromagnetic switching valve to detect jack pressure, and is disposed on the hydraulic pump side of the electromagnetic switching valve to detect pump pressure. And a pressure controller for inputting a compensation torque command to the speed controller to reduce the deviation between the jack pressure and the pump pressure to zero, the car landing on the target floor and the elevator stopping. Sometimes, the solenoid switching valve is closed while driving the hydraulic pump by applying a compensation torque so that the pump pressure becomes equal to the jack pressure, so the hydraulic elevator control that suppresses the lowering of the car and improves ride comfort There is an effect that the device can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional hydraulic elevator control device.

[Explanation of symbols]

1 cylinder 2 pressure oil 3 plungers 6 basket 9 electromagnetic switching valve 10 hydraulic pump 20A speed controller 21, 22 pressure sensor 24 pressure controller V car running pattern P ₁ jack pressure P ₂ pump pressure C compensation torque command

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66B 1/26 B66B 9/04

Claims (1)

(57) [Claims] 1. A hydraulic jack for raising and lowering a car, a hydraulic pump for sending and receiving hydraulic oil to and from the hydraulic jack, a speed controller for driving and controlling the hydraulic pump according to a car traveling pattern, the hydraulic pump and the hydraulic pressure In a hydraulic elevator control device including an electromagnetic switching valve inserted between the jack and closed when the car is stopped, a pressure sensor disposed on the hydraulic jack side of the electromagnetic switching valve to detect jack pressure, A pressure sensor arranged on the hydraulic pump side of the electromagnetic switching valve to detect a pump pressure, and a pressure for inputting a compensation torque command for reducing a deviation between the jack pressure and the pump pressure to zero to the speed controller. And a hydraulic controller so that when the car lands on the target floor, the pump pressure is equal to the jack pressure. A hydraulic elevator control device, wherein the electromagnetic switching valve is closed while driving a pump.