Axial locking device for drilling rod

Abstract

The invention discloses an axial locking device for a drilling rod, and belongs to a locking device. The axial locking device comprises a power head, a sliding block, a lever, an electric push rod, a sliding disk and a bearing ring, wherein the power head is hinged with the lever; the electric push rod controls one end of the lever to move up and down; a jacking screw is arranged in the middle of the lever and jacks the sliding disk, so that the sliding disk moves up along the axis direction of the sliding disk; a spring fixing plate is arranged on the bearing ring; a spring is arranged between the spring fixing plate and the sliding disk and controls the sliding disk to move down; the sliding disk is connected with the sliding block through the triangular lever; a mounting hole is formed at the periphery of the bearing ring; due to the up-and-down movement of the sliding disk, the sliding block is controlled to stretch and contract in the mounting hole; and a triangular lever supporting rotation point is arranged on the bearing ring. The device does not frictionize the sliding block and can axially lock the power head and the drilling rod when the drilling rod rotates to any angle.

Description

technical field [0001] The invention belongs to a locking device, in particular to a drilling rod axial locking device. Background technique [0002] During the drilling process of the drill pipe, axial load and torque need to be applied to the drill pipe. An existing drill rod is provided with four protruding key bars, which can transmit the torque of the power head. There are several annular grooves on the drill rod, so that the key bar is broken along the axial direction at this position. The current axial locking device is rigidly connected to the end face of the hollow drive shaft of the power head, and a slider is designed on it that can move along the radial direction of the drill pipe. The slider is pressed into the annular groove through two semicircular snap rings, so that the shaft of the power head The axial position is fixed relative to the drill pipe. At this time, the torque and axial force of the power head can be applied to the drill pipe at the same time....

AI Technical Summary

Problems solved by technology

[0003] However, the existing axial locking device for drill pipes has the following problems: the sliding block and the semicircular snap ring have sliding friction, and the wear is serious. At the same time, the ejection and pressing of the sliding block must be carried out at a fixed angle, which makes the control complicated and the operation troublesome. low efficiency

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