JPH07237891A - Cable tension control device for cable winder - Google Patents

Abstract

PURPOSE:To wind up and deliver a cable at a constant tension even in the case where a cable winding diameter is changed large. CONSTITUTION:A winding side pipeline 16 and a delivery side pipeline 17 are connected to a hydraulic motor 10 for driving a winding drum 9, and a high pressure pipeline 25 is connected to both the pipelines 16, 17 through a first and a second check valves 22, 23, and a high pressure relief valve 27 and a low pressure relief valve 28 are connected to the high pressure pipeline 25 through a pressure selecting valve 26. In the case where the winding diameter of a winding drum 9 is small, the high pressure relief valve 27 is operated, and in the case where the winding diameter is large, the low pressure relief valve 28 is operated. Rotating torque of the hydraulic motor 10 is thereby changed to maintain the constant cable tension when a winding diameter is changed large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the cable tension of a cable winding device such as a cable winding device for a cable replacement work vehicle.

[0002]

2. Description of the Related Art As a rope winding machine, for example,
As shown in Japanese Patent No. 0811191, a cord is wound around a winding drum that is rotated by a hydraulic motor, and the cord is wound by rotating the winding drum forward by a hydraulic motor, and a cord is formed by rotating the winding drum backward. It is known that you can get out.

In such a cord winding machine, in order to properly wind and wind the cord on the winding drum, it is required to control the tension of the cord constant during winding and feeding,
As this tension control device, a device shown in FIG. 1 of Japanese Utility Model Laid-Open No. 5-081191 is known.

In other words, the discharge pressure oil of the hydraulic pump is controlled by the switching valve to be supplied to the take-up side pipe and the take-out side pipe of the hydraulic motor, and a variable relief valve is provided in the take-up side pipe, and the take-out side pipe There is a device that connects an oil supply line equipped with a check valve to the winding pressure for winding and adjusts the back pressure for feeding by a variable relief valve, and thereby controls the tension of the cord to a constant value. Are known.

[0005]

With such a tension control device, in order to adjust the tension, it is necessary to manually adjust the set pressure of the variable relief valve, which is troublesome. In particular, if the cord winding diameter changes significantly, it is necessary to adjust the tension.In that case, the winding drum must be stopped to adjust the set pressure of the variable relief valve, and the winding must be performed continuously. It is not possible to pick up and pay out.

Further, when the tension of the cord is controlled at the time of feeding, it is necessary to operate the on-off valve, which makes the operation troublesome.

Therefore, it is an object of the present invention to provide a cord tension control device for a cord winding machine, which can solve the above-mentioned problems.

[0008]

A winding drum 9 which is driven to rotate by a hydraulic motor 10 to wind / unwind a cord 13.
The switching valve 15 for supplying the pressure oil discharged from the hydraulic pump 14 to the winding side pipe line 16 and the feeding side pipe line 17, and the high pressure side pressure oil in the winding side pipe line 16 and the feeding side pipe line 17. A high-pressure pipe 25 to be introduced, a high-pressure relief valve 27 and a low-pressure relief valve 28 connected to the high-pressure pipe 25 via a pressure selection valve 26, and means for detecting the winding diameter of the winding drum 9. The controller 33 is configured to set the pressure selection valve 26 to a position for selecting the high pressure relief valve 27 when the cord winding diameter detected by the detection means is small, and to set the pressure selection valve 26 to a position for selecting the low pressure relief valve 28 when it is large. A tension control device for a wound rope winder.

[0009]

[Operation] Since the high pressure relief valve 27 operates when the cord winding diameter is small, and the low pressure relief valve 28 operates when the cord winding diameter is large, the rotational torque of the hydraulic motor 10 changes when the cord winding diameter changes significantly. It is automatically adjusted so that the tension of the rope can be kept constant and can be continuously wound and unwound. Also,
Since the pressure on the high pressure side of the winding side conduit 16 and the feeding side conduit 17 is introduced into the high pressure conduit 25, the cord tension can be made constant without any operation during winding or unwinding. .

[0010]

[Example] As shown in FIG. 1, a front wheel 2 and a rear wheel 3 are attached to a vehicle body 1, and a front iron wheel 4 and a rear iron wheel 5 are vertically movable on an arm 6 and a cylinder 7 on the vehicle body 1. A railroad traveling vehicle that is attached and can travel along a general road and a rail 8 is constructed, and a winding drum 9 is attached to a vehicle body 1 thereof by a hydraulic motor 10 so as to be freely rotatable in forward and reverse directions to construct an electric wire replacement work vehicle. ing.

A light projector 11 and a light receiver 12 are attached to the vehicle body 1, and when the winding diameter of the cord 13 wound on the winding drum 9, for example, the electric wire 13 is increased, the light from the light projector 11 is blocked. The light receiver 12 stops receiving light and constitutes a means for detecting the winding diameter.

As shown in FIG. 2, the pressure oil discharged from the hydraulic pump 14 is switched by the switching valve 15 to the winding side pipe line 16 and the feeding side pipe line 1.
7 is supplied to the take-up side conduit 16 connected to the take-up port 10a of the hydraulic motor 10, and the pay-out side conduit 17 is fed through the flow control valve 18 to the pay-out port 10a.
The flow control valve 18 is connected to the hydraulic motor 10. The flow rate control valve 18 includes a variable throttle 19, a short-circuit path 20 communicating between the front and rear of the variable throttle 19, and a check valve 21 provided in the short-circuit path 20.
When the pressure oil flows in, the flow rate is controlled by the variable throttle 19 so that the pressure oil smoothly flows from the hydraulic motor 10 through the short circuit 20.

The winding side conduit 16 and the feeding side conduit 17
Is the first and second check valves 22 and 23 (that is, high pressure priority valve)
Is short-circuited by the first short-circuit line 24 provided with, and the first and second check valves 22 and 23 (that is, the output side of the high-pressure priority valve) are connected to the high-pressure line 25. Pressure selection valve 26
To selectively connect the high pressure relief valve 27 and the low pressure relief valve 28 to the high pressure side. The low-pressure side (drain side) of the high-pressure relief valve 27 and the low-pressure relief valve 28 is connected to a tank pipe 30, and the tank pipe 30 is connected to the winding-side pipes via the third and fourth check valves 31 and 32. Line 16 and feeding line 1
Connected to 7.

The light receiving signal of the light receiver 12 is input to the controller 33, and the controller 33 energizes the solenoid 29 when the light receiving signal is not input.
As a result, the high-pressure relief valve 27 operates when the cord winding diameter is small, and the low-pressure relief valve 2 when it is large.
8 comes to relief operation.

Next, the operation will be described. (When winding the electric wire) One end of the electric wire 13 stretched as shown by the solid line in FIG. 1 is wound around the winding drum 9, and the switching valve 15 is set to the first position C and the winding side conduit 16 is provided. After that, pressure oil is supplied to the winding port 10a of the hydraulic motor 10 to rotate the winding drum 9 in the direction indicated by the arrow a to wind the electric wire 13. At this time, the vehicle body 1 is run in the direction of arrow b.

At this time, since the winding diameter of the winding drum 9 is small, the photodetector 12 outputs a photodetection signal to the controller 33, and the pressure selection valve 26 becomes the high pressure position A and the high pressure line 25.
Is connected to the high pressure side of the high pressure relief valve 27.

The electric wire tension when the electric wire 13 is wound by rotating the winding drum 10 in the direction of the arrow a is determined by the rotational torque of the hydraulic motor 10, that is, the pressure of the winding side conduit 16 and the winding diameter. Therefore, when the wire tension exceeds a predetermined value, the pressure in the high-pressure side conduit 16 becomes higher than the set pressure of the high-pressure relief valve 27 and the high-pressure relief valve 27 operates in relief, so the wire tension is set to the set pressure of the high-pressure relief valve 27. It is maintained at a value commensurate with the winding diameter.

When the electric wire 13 is wound around the take-up drum 10 to some extent and the take-up diameter becomes large, the photodetector 12 does not receive light, so that the solenoid 29 is energized by the controller 33 and the pressure selection valve 26 is set to the low pressure position B. The high-pressure line 25 is connected to the low-pressure relief valve 28, and the winding-side line 16
Is the set pressure of the low pressure relief valve 28, and the wire tension is substantially the same as the above value.

That is, as the winding diameter increases, the wire tension increases even if the rotational torque of the hydraulic motor 10 decreases. Therefore, when the winding diameter increases, the maximum pressure is lowered to make the wire tension almost constant.

(When the electric wire is extended and stretched) As shown by the phantom line in FIG. 1, one end portion 13a of the electric wire wound around the winding drum 9 is fixed, and the switching valve 15 is extended to the second position D. Feeding port 1 of hydraulic motor 10 via side conduit 17
0b is supplied with pressure oil, and the winding drum 9 is rotated in the direction of arrow c.

At this time, since the winding diameter is large, the optical receiver 1
2 does not receive light, the pressure selection valve 26 is in the low pressure position B, and the low pressure relief valve 28 is operated to perform a relief operation.

When the vehicle body 1 is stopped in the above-mentioned state, the electric wire 13 is pulled, the pressure in the delivery side pipe line 17 rises to the set pressure of the low pressure relief valve 28, and the rotational torque of the hydraulic motor 10 is the winding diameter. And a value determined by the set pressure of the low pressure relief valve 28, and a predetermined tension acts on the electric wire.

When the vehicle body 1 travels in the direction of the arrow b in the above-mentioned state and the vehicle body traction force becomes larger than the rotational torque of the hydraulic motor 10 described above, a load torque in the reverse direction is generated in the hydraulic motor 10 and the hydraulic motor 10 Reversely, the winding drum 9 rotates in the direction of arrow a, and the electric wire 13 is delivered while maintaining the above-mentioned tension.

At this time, the pressure oil supplied to the delivery side pipeline 17 is relieved by the low pressure relief valve 28 into the tank pipeline 30, and is sucked into the winding side pipeline 16 from the third check valve 31. The motor 10 is rotated in the opposite direction by an external force, but the amount of pressure oil supplied to the delivery side conduit 17 is limited by the variable throttle 19 of the flow rate adjusting valve 18,
The flow rate of relief from the low pressure relief valve 28 is reduced.

When the electric wire 13 is sequentially fed out and the winding diameter becomes small, the photodetector 12 receives the light.
Becomes the high-pressure position A, and the high-pressure relief valve 28 performs a relief operation so that the tension becomes substantially constant.

FIG. 3 shows a second embodiment, in which a low pressure relief valve 28 is provided in a vent circuit 34 of a high pressure relief valve 27, and a high pressure position A for shutting off the pressure selection valve 26 from the vent circuit 34 and a low pressure relief valve for the vent circuit 34. It has a low pressure position B connected to the high pressure side of the valve 28, and is set to the low pressure position B when the solenoid 29 is energized.

In the above embodiment, the winding diameter is detected in two steps. However, the number of transmitters and light receivers is increased to detect the winding diameter in multiple steps, and the set pressure corresponding to the detection step is set. It is also possible to provide a relief valve of this type to adjust the tension in multiple stages according to the winding diameter, or to detect the number of rotations of the winding drum 9 and calculate the cord winding diameter by the number of rotations. It may be done.

[0028]

Since the high pressure relief valve 27 operates when the cord winding diameter is small, and the low pressure relief valve 28 operates when the cord winding diameter is large, the rotational torque of the hydraulic motor 10 when the cord winding diameter changes greatly. Is automatically adjusted so that the rope tension can be kept constant and the reel can be continuously wound and unwound. Further, since the high-pressure side pressures of the winding side conduit 16 and the paying-out side conduit 17 are introduced into the high-pressure conduit 25, the rope tension is constant without any operation during winding or paying out. You can

[Brief description of drawings]

FIG. 1 is a front view of a wire replacement work vehicle.

FIG. 2 is an explanatory diagram showing a first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a second embodiment of the present invention.

[Explanation of symbols]

9 ... Winding drum, 10 ... Hydraulic motor, 11 ... Projector,
12 ... Light receiver, 13 ... Rope, 14 ... Hydraulic motor, 15 ...
Switching valve, 16 ... Winding side pipeline, 17 ... Delivery side pipeline, 2
5 ... High pressure line, 26 ... Pressure selection valve, 27 ... High pressure relief valve, 28 ... Low pressure relief valve, 33 ... Controller.

Continued Front Page (72) Inventor Kazuyuki Saito 3-20-1 Nakase, Kawasaki-ku, Kawasaki-shi, Kanagawa Komatsu Ltd. Kawasaki Plant

Claims (1)

[Claims] 1. A rope 1 driven to rotate by a hydraulic motor 10.
3, a winding drum 9 for winding and unwinding 3, and a winding side pipe line 16 and a feeding side pipe line 17 for the pressure oil discharged from the hydraulic pump 14.
To the winding side pipe line 16 and the feeding side pipe line 17 through which the high pressure side pressure oil is introduced, and the high pressure pipe line 25 through the pressure selection valve 26. The connected high pressure relief valve 27 and low pressure relief valve 28,
A means for detecting the winding diameter of the winding drum 9, and a position for selecting the high pressure relief valve 27 for the pressure selection valve 26 when the winding diameter of the rope detected by the detection means is small,
A cord tension control device for a cord winder, comprising a controller 33 for setting the pressure selection valve 26 to a position for selecting the low pressure relief valve 28 when the pressure is large.