Gas electric locking type pneumatic sealing blowout preventer and using method thereof

Abstract

The invention discloses a gas electric locking type pneumatic sealing blowout preventer, which comprises a blowout prevention sealing device, an orifice extrusion sealing device and a control device,and the outlet of the blowout prevention sealing device is fixedly connected with the inlet of the orifice extrusion sealing device. The blowout prevention sealing device comprises a blowout prevention sealing piece, a first fixing sleeve, a front end cover and a rear end air cylinder advancing and retreating mechanism, the first fixing sleeve is fixedly connected to the interior of the blowout prevention sealing piece, the front end cover is fixedly connected with the first fixing sleeve, and the rear end air cylinder advancing and retreating mechanism is arranged on the first fixing sleeve.The inner wall of the front end cover is sleeved with an annular sealing rubber ring. A power supply signal conversion device is used for achieving the purposes of power supply locking and pneumatic sealing automatic control of a construction drilling machine in the gas hole spraying period, complete sealing passive protection of gas in a drilled hole is achieved, gas overrun in the drilling construction period is effectively eradicated, and the safety of on-site operation personnel is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine underground mining, and belongs to the coal mine gas control technology, in particular to a gas electric blocking type pneumatic sealing blowout preventer and a use method thereof. Background technique [0002] In outburst coal seams that do not have the conditions for mining protective layers, pre-drainage of construction drilling has become an inevitable choice for mine gas control. However, due to the high gas content and high pressure in the coal seam, during the underground drilling construction, coal dust and gas in the borehole are prone to continuous ejection in a short period of time. Once the control measures are not in place, the gas concentration at the construction site will be high. Exceeding the limit may even cause a gas accident. In particular, the popularization and application of hydraulic permeability enhancement measures for single low-permeability coal seams further intens...

AI Technical Summary

Problems solved by technology

However, due to the high gas content and high pressure in the coal seam, during the underground drilling construction, coal dust and gas in the borehole are prone to continuous ejection in a short period of time. Once the control measures are not in place, the gas concentration at the construction site will be high. Exceeding the limit and even causing a gas accident

In particular, the popularization and application of hydraulic permeability enhancement measures for single low-permeability coal seams further intensified the strength of boreholes and nozzle holes, resulting in the failure of simple blowout preventers. Drilling gas gushes out under blowhole conditions

At the same time, due to the suddenness of drilling gas injection holes and the randomness of the injection hole intensity, manual drilling stop and secondary protection often have obvious lag effects, and further increase the safety risk of on-site construction personnel.

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