Coal mine composite top board supporting device

Abstract

The invention discloses a coal mine composite top board supporting device, can greatly improve the anchoring and supporting effect and can guarantee reliability of anchoring and supporting during use.The coal mine composite top board supporting device is characterized in that when a composite top board is anchored and supported, an outer anchoring column is used for anchoring a large hole section, an inner anchoring rod is inserted into a small hole section for anchoring, while the small hole section extends in an inner stable rock layer, a small hole can reduce drilling difficulty of the inner stable rock layer and reduce influence on the inner stable rock layer, the anchoring stability is guaranteed, the inner anchoring rod and the outer anchoring rod can be set together to save drilling, moreover, the outer anchoring column can be fixed by a clamping assembly on the outer anchoring column axially, the anchoring effect is good, and slipping of the composite top board is prevented. The device is advantaged in that the pre-tightening structure is simple and is more reliable than directly utilizing a nut for driving pre-tightening, and the expansion and sealing effect can be significantly improved.

Description

technical field [0001] The invention relates to a coal mine composite roof support device and belongs to the technical field of coal mine support equipment. Background technique [0002] As far as the current situation is concerned, my country's economy is developing rapidly, and all walks of life have achieved a relatively large degree of development. As far as the coal mining industry is concerned, in recent years, it has continuously introduced innovative new technologies and new processes, and has also achieved certain results. Coal mine composite roof support technology is a representative new technology among them. For the composite roof coal seam, the layers are very distinct, and each layer is composed of different lithological rock layers, and at the same time, there is a relatively clear separation surface between the rock layers. For the composite roof, the coal seam has very distinct layers, and the lithology and rock layers of each layer are different to a cer...

AI Technical Summary

Problems solved by technology

[0003] At present, when supporting, anchor rods and anchor cables are generally used for support. This method can effectively support the composite roof. However, when anchor rods are used for support, the fastening force of the anchor cables is difficult to achieve. The effect of the anchor rod, and when the anchor rod is anchored, it is difficult to reach into the coal seam to stabilize the rock layer, which affects the roof support effect

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