Industrial chain lathe chain drive is a meshing drive with intermediate flexible parts. Compared with friction-type belt transmission, chain transmission has no elastic sliding and slipping phenomenon, so it can maintain an accurate average transmission ratio and high transmission efficiency, 7-0.97-0.98. And because the chain does not need to be stretched as tightly as a belt, the pressing force acting on the shaft is small. Under the same conditions, the structure of the chain drive is relatively compact. At the same time, the chain drive can operate under high temperature, water or oil, etc. Work in harsh environments. Compared with the gear transmission of a lathe, the chain transmission is easy to install, low in cost, and simple in structure when it is transmitted in a long distance. The main disadvantages of chain transmission are: it cannot maintain a constant instantaneous transmission ratio during operation, and the smoothness of the transmission is poor; the impact and noise are large during work; the teeth are prone to jump after wear; it can only be used for transmission between parallel shafts. Lathe chain drive should be used in the occasions that require reliable work, long distance between the two shafts, low speed and heavy load, harsh working environment, and other situations where gear transmission is not suitable. For example, a chain drive is applied to a motorcycle, which greatly simplifies the structure, is convenient to use and reliable in operation. The operating mechanism of the fork-like excavator also uses a chain drive. It is often exposed to harsh environments such as sand, mud and instantaneous overload, but it can work well. 1. Most of the chain plates are damaged by excessive wear and bending, and occasionally cracking. The main reasons for this are: the bending angle of the bottom plate of the chain plate machine groove exceeds the design requirement, and it is not flat; the partial shape of the bottom plate of the chain plate machine groove or the poor joint. 2. The connecting link is broken. Various connecting chains used in chain conveyors in China are produced in accordance with relevant standards. The breaking load is about 10 times the tensile force that the chain plates can withstand. The safety factor is large. In theory, chain breaking accidents should not occur. The failure rate of the connecting chain in use is relatively high. The main reasons are: long-term pulsating load, fatigue damage under far lower than the breaking tension, and the fracture is generally at the transitional connection between the arc and the straight line of the chain link; production The manufacturing quality does not meet the standards, and the materials and heat treatment levels are not good enough. 3. The conveying chain in the chain conveyor slot has come out, and the main reasons are: the bottom plate of the chain conveyor slot of the chain conveyor failed to be flat and straight according to the design requirements, but was uneven and excessively bent; the chain plate Or the slot of the chain plate is severely worn, causing the gap between the two to be too large.