JPH09189375A - Remote controller for hydraulic control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent burning of a motor, etc., by providing a pulse motor interlocked with a hydraulic control valve, a workload detector interlocked therewith, a manipulated variable detector interlocked with an operation lever, and a control part for outputting the operational result based on the detected values to the motor and letting the working of the control valve follow the operation of the operation lever. SOLUTION: A manipulated variable detector 7 is interlockedly connected to an operation lever and its output is transmitted to a control part 4. A workload detector 28 having same characteristics with the manipulated variable detector 7 is interlockedly connected to an output shaft of a pulse motor 21 and its output is transmitted to the control part 4. The difference of the outputs between the detectors 7, 28 which are input in a differential amplifier 30 is detected so as to output to an operation part 31. The operation part 31 outputs a signal of normal rotation, inverse rotation, or stop to a pulse driver 32, where pulse from a pulse generator is processed based on each signal so as to output to the pulse motor 21. This constitution can eliminate any necessity of a limit switch which is apt to cause malfunction and requires a lot of labors, and prevent troubles such as seizure of the motor, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control device for a hydraulic control valve.

[0002]

2. Description of the Related Art Conventionally, in a ship or the like, a remote control of a hydraulic control valve for controlling the operation of a hydraulic device such as a hoisting machine is performed by interlocking a direct current motor with the hydraulic control valve and operating the control panel. The potentiometer is linked to the lever, the operating direction of the operating lever is detected from the output of the potentiometer, and the DC motor or AC motor is rotated in the direction corresponding to the operating direction to reach the operating limit of the hydraulic control valve. When it reaches, this is detected by the limit switch, and the operation of the DC motor, AC motor, etc. is stopped.

[0003]

However, in the hydraulic equipment used for the above-mentioned ships, the limit switch is apt to malfunction due to poor adjustment of the limit switch or rust or corrosion due to salt. When the switch cannot detect that the hydraulic control valve has reached the operating limit, there is a problem in that an excessive current flows to the motor and the like, causing burnout of the motor and the like, and damage of the reduction gear and the like.

[0004]

Therefore, in the present invention, a pulse motor interlockingly connected to the hydraulic control valve, an operation amount detector interlockingly connected to the pulse motor, and an operating lever provided on the operation panel are interlockingly connected. It is equipped with a manipulated variable detector and a control unit that outputs the calculation result based on the detection values of the actuated amount detector and the manipulated variable detector to the pulse motor as pulsed electric power, and the hydraulic pressure for operating the operating lever is provided. It is intended to provide a remote control device for a hydraulic control valve, which is characterized by following the operation of the control valve.

[0005]

Embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a hydraulically driven hoist W.
FIG. 1 shows an embodiment to which the remote control device A for hydraulic control valve according to the present invention is applied. In the winding machine W, the hydraulic motor linked to the drum W1 is connected to the hydraulic pump 8 via the hydraulic control valve 2. Is connected to the hydraulic control valve 2 and the handle 10 attached to the shaft end of the operating shaft 9 protruding from the hydraulic control valve 2 switches the flow path inside the hydraulic control valve 2 to wind up the wire 11 attached to the winder W.・ It is possible to feed and hold the stopped state.

The remote control device A includes an operating unit 1 input by an operator B and an output unit 3 interlockingly connected to a hydraulic control valve 2.
And a control unit 4.

In the operating section 1, an operating lever 6 for operating the hoisting machine W is erected on the operating panel 5 so as to be tiltable, and a potentiometer type operation amount detector 7 is interlockingly connected to the operating lever 6. The output of the operation amount detector 7 is transmitted to the control unit 4 arranged in the operation panel 5.

On the other hand, a box body 20 of the remote control device A is arranged near the hydraulic control valve 2, and a pulse motor 21 is arranged inside the box body 20 and linked to a speed reducer 22. The reduction gear 22 is interlocked with the output shaft 24 via the reduction mesh gear 23,
24 is projected from the box body 20 so as to face the operation shaft 9, a crank 25 is continuously provided at the tip of the output shaft 24, and the base end of the interlocking fork 26 is rotatably pivoted at the tip of the crank 25. When the handle 10 is engaged with the output shaft 24 and the hydraulic control valve 2 of the remote control device A, the middle portion of the handle 10 is detachably held inside the forked portion 27 formed at the tip of the interlocking fork 26. And are linked together.

Thus, the interlocking fork 26 and the handle 10
By making it possible to engage and disengage, the remote control device A and the hydraulic control valve 2 can be interlocked, and the hydraulic control valve 2 can be manually operated by the handle 10 regardless of the remote control device A.

Further, the output shaft 24 is provided with a manipulated variable detector 7
Potentiometer-type actuation amount detector having the same characteristics as
28 are interlocked and connected, and the output of the operation amount detector 28 is transmitted to the control unit 4.

The control unit 4 includes a differential amplifier 30, an arithmetic unit 31 connected to the differential amplifier 30, an arithmetic unit 31, and a pulse motor 21.
It is composed of a pulse driver 32 connected between and.

Then, the detectors 7 input to the inverting input terminal and the non-inverting input terminal of the differential amplifier 30, respectively.
The difference between the outputs of 28 is detected and output to the arithmetic unit 31.

The arithmetic unit 31 is provided with an encoder 33 connected to the differential amplifier 30 and a pulse generator 34 connected to the pulse driver 32. In the encoder 33, when the above-mentioned output difference is positive. Indicates a forward rotation signal, a negative rotation signal indicates a reverse rotation, and a zero rotation signal outputs a stop signal to the pulse driver 32. The pulse generator 34 outputs a pulse wave having a frequency set by a trimmer or the like to the pulse driver 32. To output.

The pulse driver 32 processes the pulse from the pulse generator 34 based on each of the above signals, outputs a pulse corresponding to each of the above signals to the pulse motor 21, and causes the pulse motor 21 to rotate normally or reversely. I am trying.

The operation of the pulse motor 21 is performed by the speed reducer 2
2, the hydraulic control valve 2 via the output shaft 24 and the interlocking fork 26
Is transmitted to the operating shaft 9. Therefore, the hydraulic control valve 2 follows the operation of the operation lever 6 so that the difference between the operation amount of the operation lever 6 and the operation amount of the output shaft 24 becomes zero.

As described above, the operation amount of the operation lever 6 and the operation amount of the output shaft 24 are detected, and the output shaft 24 of the remote control device follows the operation of the operation lever 6 to operate. It is possible to prevent troubles such as seizure of the motor due to defective operation of the switch, which does not require a limit switch, which is liable to cause a defect and takes a lot of time to adjust the operating position.

Further, since the output shaft 24 is driven by the pulse motor 21, even if an erroneous operation such as operating the pulse motor 21 with the output shaft 24 fixed with a neutral stopper occurs, the same pulse will be output. Motor 21 burnout and reducer
22 damage is prevented.

Further, since the hysteresis of the pulse motor 21 is extremely small, the operating speed of the output shaft 24 following the operation of the operating lever 6 is very fast, and the frequency of the pulse for driving the pulse motor 21 is adjusted. By doing so, the following operation speed can be adjusted, which is suitable for automatic control.

Further, since the hysteresis of the pulse motor 21 is extremely small, the phase difference between the operating lever 6 and the output shaft 24 can be made extremely small.

Further, since the output shaft 24 is driven by the pulse motor 21, the operation speed of the output shaft 24 following the operation of the operating lever 6 is extremely fast, and the pulse generator 34
The tracking operation speed can be adjusted by adjusting the frequency of the pulse output generated by a trimmer or the like, which is suitable for automatic control.

In FIG. 2, 35 is a DC 24V power source, 36 is an AC 100V power source, 37 is a diode, and 38 is a breaker.

The present invention is not limited to remote control of the hydraulic control valve, but can be widely applied to positioning control.

[0024]

According to the present invention, the following effects can be obtained.

That is, a pulse motor linked to the hydraulic control valve, an operation amount detector linked to the pulse motor, an operation amount detector linked to an operation lever provided on the operation panel, and the above-mentioned operation amount detection. The operation result based on the detection values of the control device and the operation amount detector is provided with a calculation unit that outputs to the pulse motor as pulsed electric power, and by causing the operation of the operation lever to follow the operation of the hydraulic control valve, It does not require the provision of a limit switch that tends to cause malfunction, and does not require adjustment of the operating position of the switch. In particular, it is possible to completely prevent problems such as seizure of the motor due to malfunction of the switch. .

Further, since the output shaft is driven by the pulse motor, even if an erroneous operation such as operating the pulse motor with the output shaft being fixed by a neutral stopper occurs, the pulse motor will be damaged or burned out. It is possible to prevent problems such as damage to the transmission system such as the reduction gear.

Since the pulse motor has very small hysteresis, the operating speed of the output shaft following the operation of the operating lever is very high, and the phase difference between the operating lever and the output shaft is extremely small. Can
Furthermore, the frequency of the pulse that drives the pulse motor can be adjusted to adjust the follow-up operation speed to a desired value, which is suitable for automatic control.

[Brief description of the drawings]

FIG. 1 is a partially cutaway explanatory view showing a configuration of a remote control device for a hydraulic control valve according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of the control unit.

[Explanation of symbols]

 2 Hydraulic control valve 4 Control section 5 Operation panel 6 Operation lever 7 Operation amount detector 21 Pulse motor 28 Operation amount detector

Claims (1)

[Claims] 1. A pulse motor (21) interlockingly connected to the hydraulic control valve (2), an operation amount detector (28) interlockingly connected to the pulse motor (21), and an operation provided on an operation panel (5). The operation amount detector (7) linked to the lever (6) and the operation amount detector (28)
And a control unit that outputs the calculation result based on the detection values of the manipulated variable detector (7) to the pulse motor (21) as pulsed power.
(4) is equipped with a hydraulic control valve for operating the operating lever (6).
A remote control device for a hydraulic control valve characterized by following the operation of (2).