Small pillar used in coal mine

Abstract

The invention discloses a small pillar used in coal mine. The small pillar comprises a sleeve. The bottom end of the sleeve is fixedly connected to a bottom plate. First bolts are inserted into the left and right sides of the upper surface of the bottom plate. The first bolts pass through the bottom plate. The bottom plate and the first bolts are connected in a screw thread mode. The bottom ends of the first bolts are provided with pedestals. The pedestals are rotatably connected to the first bolts through a bearing. The left and right sides of the lower surface of the bottom plate are fixedlyconnected to vertical plates. By using the small pillar used in the coal mine, through cooperation among the sleeve, a sleeve rod, a groove, the bottom plate and a second bolt, the small pillar usedin the coal mine can be placed in a small space so as to support the top end of a pit. A traditional crabstick can be replaced, the stability of pit support can be enhanced, and when moving is needed,a clamping condition and a condition that moving is difficult are not generated so that the safety of a miner working in the small space is guaranteed and safety accidents are effectively prevented.

Description

technical field [0001] The invention relates to the technical field of small props for coal mines, in particular to a small props for coal mines. Background technique [0002] A coal mine is a reasonable space excavated by human beings when digging geological layers rich in coal, usually including roadways, shafts and mining faces, etc. Coal is the most important solid fuel and a kind of combustible organic rock. It is formed by luxuriant plants growing in a certain geological age. In a suitable geological environment, it gradually accumulates into thick layers and is buried in the bottom of the water or in the sand. It is formed after a long geological age of natural coalification. Collapse may occur during the process. Generally, coal mines are equipped with large lifting frames to ensure the stability of the coal mine, but there are also absenteeism in some corners or small spaces, and large lifting frames cannot enter smaller ones. The top of the mine cannot be supporte...

AI Technical Summary

Problems solved by technology

It is formed by luxuriant plants growing in a certain geological age. In a suitable geological environment, it gradually accumulates into a thick layer and is buried in the bottom of the water or in the sand. It is formed after a long geological age of natural coalification. Collapse may occur during the process. Generally, coal mines are equipped with large lifting frames to ensure the stability of the coal mine, but there are also absenteeism in some corners or small spaces, and large lifting frames cannot enter smaller ones. It is impossible to support the top of the mine in a small space, so wooden sticks are usually used to support the top of the mine. The stability of the support for the mine is not strong. Can not be guaranteed, prone to safety accidents

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