Negative pressure drilling system

Abstract

The invention relates to a negative pressure drilling system which comprises a drilling rod with a hollow inner cavity, a drilling head, a hydraulic drilling machine and a support. An exhaust port is formed in the side wall of the drilling rod, the rear end of the drilling rod is connected with an exhaust box through a dust suction pipeline, and the exhaust box is connected with an exhaust mechanism through an exhaust pipe. According to the negative pressure drilling system, most of dust discharge tasks are undertaken by the exhaust port on the side wall of the drilling rod of an induced draft drill, and therefore the effects of exhausting and dust discharging are greatly improved. A wing plate can enables large coal blocks to be broken up and guided into the exhaust port, so that dust pumping flow is smooth, and a dust discharging effect is improved. The exhaust box can filter dust and prevent the dust from directly entering the exhaust mechanism, so that the accumulated dust can be regularly discharged. The negative pressure drilling system has the advantages of being simple and reasonable in structure, easy to process and produce, strong in feasibility, good in dust discharging effect, capable of enabling the dust not to be produced in a working environment and ensuring body health of workers, and very beneficial to popularizing and implementing.

Description

technical field [0001] The invention relates to an auxiliary tool for mining coal mines, in particular to a special air suction drill for coal mines. Background technique [0002] Because gas threatens the safety of coal mining, it is an important link before coal mining to pump out the gas in the coal seam from the wall of the underground roadway of the coal mine. For some soft coal seams, only dry drilling can be used, and the compressed air blowing process is used to make the coal powder and compressed air generated during drilling spray out along the gap between the drill pipe and the hole wall. The compressed air used in the dust blowing process has a large impact energy (the impact force is too small to achieve the dust blowing effect), and the formed airflow has a strong impact force, and the dust content is as high as 3000mg / m 3 , leading to a very bad environment on the working face, which seriously threatens the health of the workers. Due to the lax management of...

AI Technical Summary

Problems solved by technology

At the same time, the gas concentration in the jet stream is high, and there is a danger of coal dust explosion in conditions such as high temperature, static electricity, and open flames.

Due to the need for high safety production, the huge amount of dust generated by dust blowing must be dealt with by dust reduction, and fan extraction is prohibited during dust reduction, and the dust reduction method is limited, resulting in poor dust reduction effect

In order to improve the serious environmental pollution problem in dry drilling, the current method is to install the hole dust collector of the drill pipe casing at the hole of the dry drilling, the small casing goes deep into the coal seam, and the large casing is close to the wall of the roadway. The blowing dust of compressed air is sprayed out along the gap between the sliding drill pipe and the small casing into the large casing, and the dust is sprayed in the large casing to reduce the dust. The dust removal efficiency is between 50% and 60%. Although the dust reduction effect is obvious, it is difficult to achieve environmental sanitation standard

Aiming at many problems existing in air-blowing drilling, the application number is to disclose a kind of exhaust drill, which intends to achieve the purpose of sucking air and dust, but there are many problems in this application and cannot be applied and implemented. One of the problems is : The drill pipe is integrated with the driving part, and the drill pipe needs to move forward automatically during actual use. The drilling holes in the field of coal mining are tens of meters or even hundreds of meters deep, and the drill pipe needs to be continuously supplemented and extended to continue moving forward. In-depth, the application must rely on manpower to push the entire drive box forward together with the drill pipe, which is not conducive to the replacement of the drill pipe. It is necessary to repeatedly push the drill pipe drive box during work, and the feasibility is very poor.

The second problem is: because the drill bit will push the dust particles backward during the drilling process, and the strength of the draft is different from that of the blower. When this application is implemented, the draft is limited to the dust particles in front of the drill bit, and there are more dust particles on the side wall of the drill pipe. Dust particles cannot be pumped away, resulting in frequent interruption of drilling work, which cannot be effectively implemented, so that the inventor proposed a new improvement plan

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