System for mounting crossbar of temporary roof support system

Abstract

A system for mounting a crossbar of a temporary roof support system having a multistage telescopic cover assembly includes a first assembly coupled to crossbar and a second assembly coupled to multistage telescopic cover assembly. The first assembly includes a first plate, a first hollow cylindrical structure, and a first pin coaxially aligned with the first hollow cylindrical structure. The first hollow cylindrical structure includes at least one first hole, and at least one slot. The second assembly includes second plate, second hollow cylindrical structure, and pin hole coaxially aligned with second hollow cylindrical structure, and adapted to accommodate first pin. The second hollow cylindrical structure having at least one second hole, and at least one third hole. An outer diameter of first hollow cylindrical structure is less than inner diameter of second hollow cylindrical structure. The system includes at least one second pin and at least one third pin.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a temporary roof support system, and more specifically, to a system for mounting a crossbar of the temporary roof support system.BACKGROUND[0002]Roof bolting is a common process to stabilize roofs in underground coal mines, tunnels and power plants. It involves inserting conventional cable or resin bolts by drilling directly into the rock strata using a roof bolter machine. The roof bolter machine generally includes a temporary roof support system for installing multiple bolts simultaneously in a roof to make it self-supporting. Typically, the temporary roof support system includes a crossbar mounted on a multistage telescopic cover assembly of a hydraulic cylinder. When the roof bolter machine travels in a mine or installs bolts in the roof, the crossbar of the temporary roof support system may be subjected to an unwanted side collision from rock strata of the roof. Such a side collision produces a large moment of force about c...

AI Technical Summary

Benefits of technology

The present patent provides a system for mounting a crossbar of a temporary roof support system using a multistage telescopic cover assembly. The system includes two assemblies, each having a plate and a hollow cylindrical structure with holes and slots. The two assemblies are connected by a pin, and the system can accommodate multiple pins. The technical effect is a more efficient and versatile mounting system for temporary roof supports.

Problems solved by technology

When the roof bolter machine travels in a mine or installs bolts in the roof, the crossbar of the temporary roof support system may be subjected to an unwanted side collision from rock strata of the roof.

Such a side collision produces a large moment of force about central axis of the crossbar and has the ability to damage components of the temporary roof support system including the hydraulic cylinder and the multistage telescopic cover assembly.

However, in such a design, if the force of the side collision is too less to shear the bolts, the bolts transfer the side load to the multi stage telescopic cover assembly of the temporary roof support system, thereby increasing the chances of failure of the multistage telescopic cover assembly or hydraulic cylinder.

Also, some of the bolts may bend that are difficult to identify and replace, which results in increased downtime of the roof bolter machine.

Therefore, in current designs, complete isolation of load transfer from the crossbar to the other components of the temporary roof support system is not possible irrespective of the magnitude of the side load.

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