A Design Method for the Geometric Dimensions of the Cutting Teeth of the Chain Cutting Part of a Coal Shearer

Abstract

The invention provides a method for designing geometrical size of a coal cutter chain cutting part cutting tooth. The method comprises the following steps: step 1, determining the relation between cutting depth and cutting torque; steps 2, determining the relation between cutting tooth stress and the cutting depth; step 3, analyzing cutting force in a coal breaking process by the cutting tooth; step 4, determining the contact relation between cutting tooth and a coal wall; step 5, calculating the contact area between single cutting tooth and the coal wall in a cutting process; step 6, determining the relation between the cutting tooth contact area and the cutting depth; step 7, calculating the diameter of the cutting tooth body. The cutting force applied to unit size stressed surface of the cutting tooth in a cutting process tends to be equal, so that abrasion of the cutting force is more uniform, the adaptability of the cutting tooth is enhanced, the cutting efficiency of the cutting tooth is improved, the service life is prolonged, the reliability of a coal cutter is improved, a better economic benefit is obtained, and meanwhile, the coal loading effect of a cutting part can be improved.

Description

Technical field [0001] The invention relates to a method for designing the geometric size of cutting teeth of a chain cutting part of a coal shearer, and belongs to the field of coal mine equipment. Background technique [0002] The chain shearer is mainly composed of a traction part, a walking part, and a cutting part. The cutting part includes three parts: the body frame, the cutting chain power part and the cutting chain. As the key component and working mechanism of the shearer, the cutting part of the shearer is responsible for cutting and loading coal. Its performance determines the working performance and production efficiency of the shearer. The power consumption of the shearer accounts for 80%-90% of the installed power of the shearer, and the shearer's production capacity, energy consumption, load condition during work, force on the cutting teeth, lump coal rate, dust volume, and work Various performance indicators such as stability and reliability are closely related ...

AI Technical Summary

Problems solved by technology

[0004] The structure of the cutting teeth on the cutting part of the existing chain shearer is the same, and the lengths of the cutting teeth are nearly equal, and the cutting resistance of the cutting teeth with a larger cutting depth is greater than that of the cutting depth. Smaller cutting teeth, the cutting teeth wear unevenly during use, and the cutting teeth at the larger cutting depth tend to wear more and have a shorter service life, which results in chain shearer A part of the cutting teeth on the cutting part wears out quickly, resulting in a short service life of the cutting part as a whole, and frequent replacement of cutting teeth will affect the normal production operations of coal enterprises, reducing production efficiency and economic benefits

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