Rotary jet self-priming type short-range strengthening foam production device for dust suppression of coal mining machine

Abstract

The invention discloses a rotary jet self-priming type short-range strengthening foam production device for dust suppression of a coal mining machine. The device comprises a pressure water supply pipe, a swirl nozzle and a jet foaming barrel, wherein the pressure water supply pipe is connected with the swirl nozzle; the jet foaming barrel is internally and sequentially provided with an air suction chamber, a liquid suction chamber, a mixing throat pipe, a pressurizing foam formation chamber, a strengthening foam production chamber and an accelerating flow-out chamber; the swirl nozzle is screwed into the air suction chamber in the jet foaming barrel by screw threads; an air suction hole is formed in the air suction chamber, and a liquid suction hole is formed in the liquid suction chamber, and is connected with a liquid suction hose; a trapezoidal runner threaded rod is arranged in the strengthening foam production chamber. According to the device, air and a foaming agent can be automatically sucked by swiveling jet, and a pressure ventilation pipeline and a foaming agent adding device do not need to be provided, so that the device is reliable and high in applicability; efficient energy transfer and mass transfer of three mediums including water, air and the foaming agent as well as low-resistance dust suppression foam production can be realized by the short-range mixing throat pipe and the strengthening foam production chamber; the device is high in foam production efficiency and large in foam exit momentum, thus being suitable for controlling the cutting dust of the coal mining machine.

Description

technical field [0001] The invention relates to a foam preparation device for dust prevention in mines, in particular to a rotating jet self-priming short-range enhanced foam production device for dust suppression of coal mining machines. Background technique [0002] The mechanized coal mining face (hereinafter referred to as the mechanical mining face) is one of the most serious dust disasters in underground coal mines. Among them, the cutting operation of the coal mining machine is the largest source of dust production in the mechanical mining face, and its dust production accounts for Therefore, taking effective measures to prevent and control the cutting dust of coal mining machines is the top priority of the dust prevention work of the machine mining face and even the whole mine. Compared with the existing water spray dust suppression technology of coal mining machines, the dust suppression foam has the advantages of large volume flow rate and dust contact area, strong...

AI Technical Summary

Problems solved by technology

However, it was found in the application practice of the machine mining working face in the later stage that the technical solutions disclosed by the above-mentioned publication numbers CN103084022A and CN103089262A have the following deficiencies: ① they all use the foaming liquid jet to automatically inhale, that is, they need to use additional foaming liquid Foaming agent adding equipment (such as quantitative adding pump) adds foaming agent to water to form foaming liquid, which makes the foam preparation process still relatively complicated, which is not suitable for the space-time conditions of the machine mining face; ②The amount of air sucked by the foaming liquid jet is partial Small, because the final foam production mainly depends on the amount of self-suction air, so the amount of foam prepared on site is relatively small, and it is difficult to meet the needs of efficient dust suppression of coal shearers; ③The resistance loss in the foaming chamber is relatively large, and the foam outlet speed Small size, it is difficult to effectively spray to the coal and rock cut by the shearer drum; ④The long-sized mixing chamber and foaming chamber are used, which makes the geometric scale of the foaming device relatively long. It is difficult to install and fix the equipment

In addition, the patent publication number CN103089263A, the Chinese invention patent with the publication date of 2013-05-08 "Roadheader Foam Dust Reduction System Based on Self-suction Air Foaming", although the foaming device in the disclosed technical solution overcomes the above-mentioned first point Insufficient, but still have the problems mentioned in ②~④, and the liquid suction hose in this device is directly set at the front end of the gas-liquid mixing chamber, when the pressure water and air flow through here, the fluid volume is compressed due to the sharp contraction of the channel section , so the pressure of the fluid on the tube wall increases, which increases the difficulty of sucking the foaming agent from the outside, resulting in the inability to add the foaming agent stably and continuously and affecting the foaming effect

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