Pinion and rack clamping mechanism

Abstract

The invention relates to a pinion and rack clamping mechanism, comprising a clamping part, a transmission part and a power part, which are installed on a chuck seat. The power part comprises a chuck cylinder and is used for driving the transmission part. The transmission part comprises a rack seat, a bracket, a left hand toothed nut, a right hand toothed nut, a chuck rack, a positioning clip, a stop block and a rack, and is used for converting the power of the power part into clamping force. The clamping part comprises a slip, a slip cushion block and a slip seat. The slip is used for clampinga drill pipe. A slip cover and an upper slip seat cover are arranged at the top of the chuck seat. The clamping mechanism has reasonable structure, wide adjustable range, large clamping force and little impact on own structure, expands the serviceable range of the drilling machine and elevates the efficiency and generality of the drilling machine. The opening stroke of the chuck can be freely adjusted by the cylinder stroke and the chuck has wide clamping range. The bearing has loose and comfortable working environment and long life. The chuck is more easily mounted and dismounted than the disc spring type chucks and is convenient to be maintained.

Description

technical field [0001] The invention belongs to the technical field of construction machinery, and relates to an accessory device of a drilling rig, in particular to a rack and pinion clamping mechanism. Background technique [0002] The power head is an important part in the structure of the drilling rig, and the chuck on the power head for clamping the drill pipe plays a key role. The size of its clamping force and the reliability of its action are directly related to the performance of the drilling rig. Basic performance and construction safety, most of the traditional chucks are hydraulic, that is, the disc spring is pressed and the oil pressure is released. This structure does have the advantage of compact structure, but because its normal state is the disc spring preload , so the pre-tightening pressure always acts on the thrust bearing, which has a great impact on the life of the bearing. For this reason, the hydraulic chuck cannot be driven and rotated without clampi...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art that the chuck cannot be opened empty and the life of the thrust bearing is short, and provide a gear tooth with reasonable structure, adjustable chuck opening stroke, large chuck clamping range and wide application range. Strip clamping mechanism, which can greatly improve the efficiency and versatility of the drilling rig

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