Rock bolt is one of important supporting materials in preventing roof fall in mining

Rock bolt is one of important supporting materials in preventing roof fall in mining.

11/mar/2016 10.34.48 sinorockzqq Contatta l'autore

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The application of rock bolt in mining industry can track back to the 1930s. Belonging to active supporting, anchor bolt can transform surrounding rock of roadway into supporting body. It has strong adaptability and small deformation. It can ensure safety in production and has brought great economic and social benefit.

Rock bolt is one of important supporting materials in preventing roof fall in mining project, its quality relates directly to safety production.

When processing the thread of rock bolt, thread-rolling machine is the main equipment. The thread quality has improved largely than primary pipe threader, thread surface is smooth and tensile strength is improved.

Rolling pressure can not only influence quality of thread, but also influence precision and lifetime of equipment. If rolling pressure is small, the pitch diameter of thread will big and outer diameter is small, thread form is not full and tensile strength will decrease; if rolling pressure is big, thread and thread-rolling machine will have defect and loss.

Choosing appropriate rolling time should depend on several factors, such as rolling pressure, material’s physical property, size and shape, etc.

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