Overload protecting device for transmission element of cutting part of coal mining machine

Abstract

The invention discloses an overload protecting device for a transmission element of a cutting part of a coal mining machine. The device comprises a cutting motor (1), a frictional torque limiter (5) for performing overload protecting, and a cutting speed reducer (9), wherein an input shaft (4) of the frictional torque limiter (5) is connected to a motor shaft (2) of the cutting motor (1) through a coupling I (3), and an output shaft (6) of the frictional torque limiter (5) is connected to a high-speed shaft (8) in the cutting speed reducer (9) through a coupling II (7). According to the overload protecting device, the frictional torque limiter is of a wet type multi-frictional-sheet structure; if the cutting part of the coal mining machine is subjected to overload, the frictional sheets in the frictional torque limiter can slip to achieve overload protection; in addition, after the overload, the frictional torque limiter can be automatically recovered into the normal working state. The overload protecting device has the advantages of being simple in structure, reliable to work, large in transmission torque, easy to maintain, easy to manufacture, and low in cost, and preventing the transmission element of the cutting part from torsional damage during the overload.

Description

technical field [0001] The invention relates to an overload protection device for a transmission element of a cutting part of a coal shearer, belonging to the technical field of mining coal shearers. Background technique [0002] Coal is one of the main energy sources in my country, and its mining and use promote the stable development of my country's economy. Due to the complex geological structure in our country, coal quality and mining environment are generally poor, coal mining is likely to cause a sudden increase in cutting resistance, causing overload, and even damage to the transmission parts, affecting the normal operation of the shearer and coal production. [0003] At present, methods such as setting torque safety shafts, motor overcurrent protection, installing elastic couplings, and ordinary friction torque limiters are often used in engineering to prevent overload, but these methods cannot fully realize overload protection in practical applications. , for examp...

AI Technical Summary

Problems solved by technology

Due to the complex geological structure in our country, coal quality and mining environment are generally poor, coal mining is likely to cause a sudden increase in cutting resistance, causing overload, and even damage to the transmission parts, affecting the normal operation of the shearer and coal production.

[0003] At present, methods such as setting torque safety shafts, motor overcurrent protection, installing elastic couplings, and ordinary friction torque limiters are often used in engineering to prevent overloading, but these methods cannot fully realize overload protection in practical applications. , for example: the torque safety shaft realizes overload protection through the unloading groove. When overloaded, the unloading groove breaks and needs to be replaced with a new torque safety shaft, which will affect the working efficiency of the shearer; the response time of the motor overcurrent protection It lags behind the time taken for impact load damage; the elastic coupling can only eliminate the influence of misalignment and vibration; while the ordinary friction torque limiter has the disadvantages of small transmission torque and short life; therefore, there is an urgent need for a An economical, safe and effective overload protection device for the transmission element of the cutting part of the shearer

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