Dust settling and blocking preventing pipe wet concrete stirrer for underground coal mine

Abstract

The invention relates to a wet concrete stirrer for underground coal mine, and concretely relates to a dust settling and blocking preventing pipe wet concrete stirrer for the underground coal mine. A technical problem of pipe blocking caused by the wrapping of a stirring shaft by cement, frequently appearing in present wet concrete preparation processes, is solved. The dust settling and blocking preventing pipe wet concrete stirrer for underground coal mine comprises a stirring cylinder with an open-ended upper portion, one end of a stirring shaft traverses out of a shaft end, and the portion of the stirring shaft positioned in the stirring cylinder is provided with a plurality of stirring blades through a connecting rod vertical to the stirring shaft; the stirring shaft has a hollow structure, and the one end traversing out of the shaft end is provided with an opening; and each dust settling nozzle group comprises a plurality of dust settling nozzles arranged around the stirring shaft, connected with the internal of the stirring shaft and vertical to the stirring shaft, and the opening position of the stirring shaft is provided with a water volume controller. The dust settling and blocking preventing pipe wet concrete stirrer overcomes a dust problem generated during material feeding and stirring, avoids the blocking problem of a conveying pipe, and also has the advantages of simple structure, low cost and strong practicality.

Description

technical field [0001] The invention relates to a mixing device for a wet concrete mixer truck used in underground coal mines, in particular to a wet concrete mixer for dust-reducing and blocking-proof pipes in underground coal mines. Background technique [0002] In the shotcrete anchor support operation in coal mines or in the treatment of coal seams with spontaneous combustion tendency, it is necessary to use concrete to seal the surface of rock roadways or coal bodies. A large amount of dust generated during the process of concrete feeding, mixing, conveying and spraying has caused great harm to the staff and safety production. As a dust control method, spray dust suppression technology can reduce the concentration of rock dust and reduce the incidence of pneumoconiosis. play an important role. [0003] Wet concrete spraying technology in coal mine is a new spraying process developed in recent years to replace tidal spraying process. However, the most common failure of...

AI Technical Summary

Problems solved by technology

When the dry material is mixed in the mixing drum of the mixer truck, cement, fine sand, additives and other fines will stick to the wet stirring shaft. After a long time, the stirring shaft will be wrapped with a thick layer of very dense High cement layer, coupled with the impact of dry material, mixing action, cement's own gravity and machine vibration, will cause the cement wrapped around the stirring shaft to overcome the adhesive force and fall into the mixing drum, forming a large diameter, certain hardness. Cement blocks, as the slurry enters the delivery pipe, causing pipe blockage

[0004] Therefore, it is necessary to design a wet concrete mixing device that can not only reduce the dust generated during wet concrete feeding and mixing, but also solve the common pipe plugging problem of this process

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