Optimization design of intermediate frame structare of non-repeated support self-moving belt conveyo rtail

Aiming at the current situation of the tail-pull process of the traditional excavation face of coal mine,“back machine-manual pulling and moving-manual adjustment and deviation-anchor fixing”,in order to realize efficient and fast driving, a new type of self-removing tape belt machine without repeated support for the driving face of the broken roof was invented. Considering the transport capacity of the tail, belt band width, belt speed, idler structure and lifting mechanism, the intermediate frame structure design was carried out. In order to improve the reliability and applicability of the tail intermediate frame, a solid model of the tail intermediate frame was established based on engineering practice and virtual prototyping technology. According to the working process of the self-moving tail, the force of the intermediate frame body under the worst working condition was selected as the static simulation load. Through simulation analysis, the weak links of the intermediate frame were found, and the structure was optimized. After optimization, the main stress value of the intermediate frame decreased from 150 MPa before optimization to about 35 MPa. The maximum deformation of the frame body was reduced by 36.1%, and the strength and stiffness of the intermediate frame body were significantly improved, effectively ensuring the safe and reliable operation of the self-moving tail without repeated support. At the same time, it was found in this paper that stress concentration is easy to occur at the joint in profile steel welding, where the welding quality of weld had a significant impact on the service life of the whole machine.