Underground coal mine deep hole compound type diameter expanding cave making device

Abstract

The invention discloses an underground coal mine deep hole compound type diameter expanding cave making device. The device comprises a rod body with a central through hole, a male head and a female head are arranged at the head end and the tail end of the rod body respectively, assembling holes are formed in the circumferential wall of the rod body, diameter expanding drilling wings are arranged in the assembling holes, the through-connection ends of the diameter expanding drilling wings are provided with circumferential walls, and rotating teeth are uniformly arranged on the circumferential surfaces of the circumferential walls; a piston rod, a spring and a plugging rod are arranged in the central through hole, a water circulation hole is formed in the piston rod, the piston rod is arranged in the central through hole in a sliding and sealing manner, the head end of the plugging rod fixedly abuts against an inner cavity of the male head, the tail end of the plugging rod faces the water circulation hole, the plugging rod is sleeved with the head end of the spring, and the tail end of the spring abuts against the head end of the piston rod; and toothed plates are arranged on the piston rod, and a plurality of high-pressure jet holes are evenly formed at the periphery of a rod body of the piston rod. According to the device, a composite diameter expanding cave making structure of the diameter expanding drilling wings and high-pressure water jet is adopted, and efficient hole expanding cave making can be realized in an underground drill hole in cooperation with a gear efficient transmission structure of the diameter expanding drilling wings.

Description

technical field [0001] The invention relates to the technical field of coal mine underground equipment, in particular to a coal mine underground deep hole composite type expanding diameter cavitation device. Background technique [0002] There are many mines with high gas, coal and gas outbursts in my country, and coal mine gas has always been a major hidden danger to coal mine safety production. Due to the complexity and diversity of geological structures in my country and the particularity of the coal-forming environment, the permeability of coal seams is generally poor, especially in areas where structural coal is developed, and the permeability of coal seams is even lower. Therefore, improving the gas permeability of coal seams, especially in structurally developed areas, is the key to efficient gas extraction. [0003] The measures to increase permeability of coal seams in tectonic coal development areas mainly include a series of transformation measures such as hydrau...

AI Technical Summary

Problems solved by technology

[0004] In the Chinese patent application CN201310252145.6, the disclosed drilling hole-making device adopts a cutting arm that can be opened or closed, and the opening and closing of the cutting arm is completed by the rotating power and feeding power of the drill rod. This kind of drill bit that can be changed in diameter does not have the function of hydraulic reaming. At the same time, the transmission of power depends on multiple rods. In practical applications, the connection strength and torque resistance of each connecting piece need to be considered, which is prone to problems in use;

[0005] Chinese patent application CN201910504348.7 discloses a drilling cavitation device with infinite diameter expansion, which uses many transmission components such as bevel gears, and the transmission structure is complex. There are also many problems in practical applications, and the practicability is not strong;

[0006] Chinese patent application CN202010209172.5 discloses a hydraulic cavitation mechanism, which uses the pressure switching of high and low pressure water flow to realize the switching of low-pressure water cooling powder discharge and high-pressure water jet cavitation, but does not have the function of variable diameter hole expansion. There are still the above-mentioned problems such as uneven hole size and difficulty in accurately controlling the size of the hole; and the same problem exists in the Chinese patent application CN201821727763.6, which can only meet the switching of high and low pressure water flow.

[0008] 1) Between the drill fin and the piston, the thrusting curved surface with a specific arc bending angle is used to drive and cooperate with the arc-shaped wall. In the drilling construction with complex underground environment, the pushing surface and the arc-shaped wall are easy to wear and slip, resulting in power transmission The power transmission effect is poor or even lost, so that the drill fins often cannot be effectively opened;

[0009] 2) When the drill fin is fully opened, the drill fin is subjected to high changing torque, and the change of torque will cause a slight twist of the connecting arm, so that the piston and the pressure plate that are in contact with it will follow a slight The torsion will further cause the entire hydraulic drive mechanism to follow the rotation. If things go on like this, the connecting arm, the piston and the pressure plate will not be able to closely transmit and contact each other, making the power transmission impossible and power loss;

[0010] 3) When the drill fin is fully opened, the falling cinders will partially gather at the high-pressure water outlet hole, which may block the high-pressure water outlet hole. What's worse, the cinders will infiltrate into the center through the high-pressure water outlet hole. Between the through hole and the valve body, the valve body rotates to a certain extent during construction, which causes wear on the rod body and the valve body, resulting in local high stress concentration at the damaged part, and in severe cases, the valve body or the rod body is directly and partially broken;

[0011] 4) There are many parts in the whole hydraulic drive mechanism, and they are closely connected with each other. Once any part has a problem, it will cause the whole to be unusable or the function will be greatly reduced

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