Method and device for controlling over-relaxation of wire rope in floating of winch

Abstract

The invention discloses a method and a device for controlling the over-relaxation of a wire rope in the floating of a winch. In the process of realizing floating relaxation by the gravity of a load, the wire rope is always in a pre-tightened state by applying a certain back pressure to the lifting side of the winch. A back pressure valve (7) or a one-way valve with a certain opening pressure is connected in series with oil paths of a floating control valve (2) and on the lifting side of a motor (1). When in a floating state, the winch still can pre-tighten the wire rope to a certain extent and avoid the failures of disorder of the wire ropes on the winch and loose strands of the wire ropes, thereby prolonging the service life of the wire rope.

Description

technical field [0001] The invention relates to a method for controlling the over-discharge of the steel wire rope when the hoist is floating, and also relates to a device for realizing the method for controlling the over-discharge of the steel wire rope when the hoist is floating. Background technique [0002] like figure 1 As shown, on the rotary drilling rig, the drilling tool is hoisted down to the bottom of the hole for operation. When the drilling tool is placed close to the bottom of the hole by the winch, the operator opens the floating control valve 2 and controls the motor 1 The hydraulic oil circuit is short-circuited, and the oil pressure at both ends of the motor is equal. Under the force of the drilling tool 5's own weight, the winch 3 drives the motor to rotate and lower, and the drilling tool falls to the bottom of the hole. At this time, the weight of the drilling tool is borne by the bottom of the hole. , the winch is in a free state, which is called the w...

AI Technical Summary

Problems solved by technology

However, during the drilling process, sometimes the steel wire rope 4 sags and over-discharge occurs, causing the steel wire rope to bend. When the steel wire rope is bent to the surface state of the drilling tool, the drilling tool rotates relative to the steel wire rope and causes excessive wear and loose strand damage of the steel wire rope; Or when the winch is lifted again, the steel wire rope is over-released, which will cause confusion on the drum and damage the steel wire rope.

This has caused the fault that the wire rope has not reached its service life and is damaged.

Before the present invention, it mainly depends on the operator's careful observation and timely operation to prevent the phenomenon of wire rope over-discharging when the winch is in a floating state, but this increases the labor intensity of the operator.

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