Holder

Abstract

The invention belongs to the field of mine machinery and particularly relates to a holder for a mine tunnel drilling machine. The holder provided by the invention comprises a left piston cylinder unit and a right piston cylinder unit which are respectively arranged at the two sides of an axis of a drill rod; piston rods of the left and right piston cylinder units are oppositely arranged; the front ends of the rod bodies of the piston rods are fixedly connected with a left holding block and a right holding block which are matched to be used for holding the drill rod; each piston cylinder unit at least comprises a piston cylinder; the piston cylinders are bidirectional hydraulic piston cylinders; and the left and right piston cylinder units are mutually reverse to form thrust or tension symmetrical arrangement. The holder provided by the invention has the advantages of simplicity in structure, stability and reliability in operation and long service life.

Description

technical field [0001] The invention belongs to the field of mining machinery, and in particular relates to a holder for a mining tunnel drilling machine. Background technique [0002] Tunnel drilling rig is a drilling rig specially used for drilling in underground roadways. Drilling rigs are usually equipped with clamps, which are mainly used to protect the drill pipe in the hole and prevent the drill pipe from slipping in the hole. Cooperating with the automatic disassembly of the drill pipe, the hydraulic clamp is widely used because of its safe and convenient use and large clamping force. [0003] At present, the commonly used hydraulic clamps are mainly three types: normally closed, normally open and compound. In this regard, Jiangsu China Coal Mining Equipment Co., Ltd. In the application text of "a top-open composite gripper" (ZL201010108949.5) of the Xi'an Research Institute of the General Academy of Scientific Research and the "Compound Hydraulic Gripper" (ZL200820...

AI Technical Summary

Problems solved by technology

The general defects of the above-mentioned technical solutions are: firstly, elastic devices such as springs, etc., rely on their own deformation to achieve the purpose of clamping, and there must be fatigue. The shorter the length, the more frequent maintenance and repairs and disassembly and replacement are required by the staff, causing troubles to the construction; secondly, when the spring needs to be replaced, it is often necessary to replace the clamping devices on both sides together, otherwise it must be due to its clamping force or loosening The imbalance of the force leads to the deviation of the clamping center, and finally the phenomenon of bending of the drill pipe or grinding slips on the outer wall of the drill pipe occurs because the actual clamping axis deviates from the axis of the drill pipe of the drilling rig, resulting in an increase in maintenance costs; again, In the normally closed hydraulic clamp where the one-way cylinder is released and the spring is clamped, the clamping force often depends on the tension generated by the spring, which requires larger specifications or more springs, but the increase of its force is inevitable. As a result, the one-way thrust of the oil cylinder needs to be increased in order to overcome the spring force to open the clamping port, which in turn results in an increase in the overall volume of the clamp and a decrease in the hydraulic opening and closing efficiency. Once the spring is fatigued and the clamping force is insufficient, there will be a great hidden danger in production. In the composite hydraulic clamp, because the elastic device is always in the "pressed" state, after working for a period of time, it will be pressed. The elastic device under pressure is fatigued, and the tension decreases, while the hydraulic pressure of the one-way oil cylinder as the pressure applying party remains unchanged, and the clamping axis of the clamping device is offset, which eventually leads to the discrepancy between the axis line of the drill pipe and the clamping through hole. The axes do not coincide, the drill pipe will grind the inner wall of the slips, and even the drill pipe will be bent and broken; finally, due to the special working environment of the holder, no matter what kind of holder, there will be clamping The problem of sludge accumulation at the clamping mouth and damaged slips, the slips in the above scheme are all set in the external shell, once the sludge at the clamping mouth needs to be cleaned or the slips are damaged and needs to be replaced, the entire device often needs to be disassembled , resulting in wasted man-hours

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