Control device for hydraulic winch

Abstract

The control device of the hydraulic winch of the present invention is configured in such a manner that the capacity of the variable capacity hydraulic motor as the drive source of the winch is controlled by a regulator in accordance with the motor load pressure, and in order to prevent overload, the During automatic stop, the hydraulic motor is kept at a standstill by using a negative brake; during automatic stop, a signal is sent from the controller to the regulator through the regulator control valve, and the motor capacity is set to the large capacity side. In this way, during the lifting operation, when the automatic stop function is resumed, there will be no hysteresis of the motor capacity until the recovery, and the responsiveness of the control can be improved.

Description

technical field

[0001] The present invention relates to a control device for a hydraulic winch that uses a variable capacity hydraulic motor as a drive source to control the lifting / lowering of a trolley drum. Background technique

[0002] In a hydraulic winch, a variable capacity hydraulic motor is often used as a drive source so that the lifting / lowering speed and force can be changed according to the load. For this purpose, as a control device, the constitute.

[0003] The hydraulic motor 1 is provided with a negative brake 12 for keeping the hydraulic motor 1 in a stopped state. When the brake valve 14 of the brake 12 is switched from the brake release position X to the brake actuation position Y, the hydraulic pressure in the pressure chamber 12a is discharged into the tank T, and the negative brake 12 becomes an operating state.

[0004] The switching valve 16 is controlled based on a signal from the controller 11, and the switching valve 16 switches from the remote ...

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