Navoi State Mining Institute, Navoi, Uzbekistan:

L. N. Atakulov, Associate Professor, Candidate of Engineering Sciences, info@ndki.uz
S. K. Kakharov, Associate Professor, Candidate of Engineering Sciences
Sh. B. Khaidarov, Senior Lecturer

Practice of rubber conveyor belts at mines shows that the least reliable points in the closed loop of a belt are its joints. Usually, available methods of jointing two belts involve lapped joint without twisting. Such joints serve for round 2 years without repair. Aiming to increase operational reliability and extend life of belt joints, the authors of this article offer an improved method of belt jointing by means of untwisting of meeting threads and, then, their intertwisting by a dedicated scheme. In order to analyze strength of joints in the current and newly proposed methods, the specimens of jointed belts were subjected to tension up to 50 t on a special testing machine. It is found that the belt joints by the proposed method bear twice as high breaking load as against the joint by the conventional technology. Accordingly, service life of the improved joints and the whole belt doubles. The introduction of the proposed jointing methods for rubber belts will enable reduction in conveying operating cost, raise productive capacity of conveyors and increase volumes of conveyed rock mass.

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