A Coal Mine Support Variable Angle Shotcrete Structure

Abstract

The invention relates to a coal mine supporting variable-angle spray structure that uses a sliding ring to change angles of a plurality of arc tubes so as to change the spray angle so that that the spray efficiency of coal mine surrounding rock can be improved effectively. A fixed frame is a concave arc plate; a through hole is formed in a middle portion of the fixed frame; and a plurality of clamping rings are respectively arranged at the outer side of the fixed frame. The clamping rings are arranged obliquely and are connected with the fixed frame at lowest heights; and the clamping rings are made of rigid materials. A plurality of supporting wheels are respectively arranged at the fixed frame and are arranged in the plurality of clamping rings in a one-to-one correspondence manner; andlimiting blocks are arranged at the inner rings of the clamping rings and are opposite to the supporting wheels. One end of a hollow tube is arranged in the through hole of the fixed frame and is connected with the fixed frame and has an enclosed structure. A sliding ring is arranged at the other end of the hollow tube; and a guiding plate is arranged at the sliding ring right above the fixed frame.

Description

technical field [0001] The invention relates to a variable-angle spraying structure for coal mine support, which relates to a structure for spraying a rock wall during support in coal mine mining, and belongs to the field of coal mine equipment. In particular, it relates to a spraying structure that changes the angles of a plurality of arc-shaped tubes by pushing the sliding ring, and then changes the angle of the spraying. Background technique [0002] At present, when mining and supporting coal mines, it is necessary to protect the side slope of the coal mine. During the protection, it is necessary to carry out spraying to form a concrete layer in the surrounding rock, and to carry out support to ensure the strength of the roadway. The spraying is mainly to mix cement and sand. Condensation is formed by high-speed spraying on the rock wall. The existing spraying head adopts a conical tube structure, and by changing the cross-sectional area of ​​the spraying position, the s...

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Problems solved by technology

[0002] At present, when mining and supporting coal mines, it is necessary to protect the side slope of the coal mine. During the protection, it is necessary to carry out spraying to form a concrete layer in the surrounding rock, and to carry out support to ensure the strength of the roadway. The spraying is mainly to mix cement and sand. Condensation is formed by high-speed spraying on the rock wall. The existing spraying head adopts a conical tube structure, and by changing the cross-sectional area of ​​the spraying position, the spraying speed is changed. The single-channel structure needs to be manually sprayed. The angle is deflected, and there is a large recoil force. When spraying grout, the grout hits the wall and has a large rebound loss. Especially when spraying continuously, the subsequent grout will wash off the previous layer of grout, which will affect the coagulation of the concrete. form a support

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