Drill pipe clamping device for gas drainage drilling rig

Abstract

The invention relates to the technical field of coal seam drilling rigs, and discloses a drill rod clamping device for a gas drainage drilling rig, which includes a casing, a motor is fixedly connected to one side inside the casing, and an output shaft end of the motor is fixedly connected to the casing. There is a shaft coupling, and one side of the shaft coupling is fixedly connected with a transmission screw. Through the cooperation of the motor, coupling, transmission screw, and rack and pinion, the clamping and separation of the slip seat can be realized, and the clamping and loosening of the drill can be quickly realized by the clamper, which improves the work efficiency. After long-term use, the slips can be opened quickly and easily when the clamper stops, which is convenient for the detection and replacement of slips; moreover, it can increase sufficient pre-tightening force for drill pipes and drilling tools, compared with butterfly springs , there will be no deformation and displacement, and it can provide sufficient early warning force when encountering heavy drill pipes and drilling tools, or when the drill pipe shakes, avoiding the occurrence of drill tool slippage due to insufficient early warning force.

Description

technical field [0001] The invention relates to the technical field of coal seam drilling rigs, in particular to a drilling rod clamping device for a gas drainage drilling rig. Background technique [0002] At present, the underground gas drainage of coal mines uses a full-hydraulic power head gas drainage drilling rig with mine gas concentration detection to drill coal seams. Drilling tools to prevent drilling tools from slipping in the hole, and can also cooperate with the power head to automatically unscrew the drill pipe when necessary. The working principle of the normally closed hydraulic clamp is as follows: Figure 5 : The hydraulic cylinder is composed of a shell and a slip seat. When the shell is supplied with oil, the slip seat drives the slip seat and the slips to move axially outward under the push of the pressure oil. At this time, the orifice becomes larger and the butterfly shape The spring is in a compressed state; put in the drilling tool, stop the pressure...

AI Technical Summary

Problems solved by technology

[0004] 1. The hydraulic clamp is mainly composed of the shell and the slip seat to form an oil cylinder, which leads to a high degree of sealing between the slip seat and the shell, so the friction of the contact part is relatively large, and the butterfly spring is compressed by oil supply. Loosening the drilling tool has a certain hysteresis, which leads to a longer time for each rod change, which is not conducive to the rapid and efficient drilling work. Secondly, due to the long-term contact between the slips and the drill pipe and drilling tools, the slips are severely worn , requires regular inspection and replacement, and oil must be supplied each time the inspection and replacement are performed, so that the slips on both sides can be separated for inspection and replacement, which not only wastes time, but also increases the workload of the staff

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