China's machinery manufacturing industry is in an industrial state of transformation and development. The industry's technical level is developing rapidly, production concentration is high, and market access is very large. Our company has advanced machinery manufacturing technology, a group of outstanding machinery manufacturing R&D personnel and perfect standardized quality supervision and management, and is committed to the globalization, networking, automation and green development of the machinery manufacturing industry. A sprocket is a wheel with cog-style sprocket teeth that engages the exact pitch blocks on the link link or cable. Sprockets are widely used in chemical, textile machinery, escalators, wood processing, three-dimensional parking garages, agricultural machinery, food processing, instrumentation, mechanical transmission in petroleum and other industries. The existing welding method of the sprocket assembly is welding first and then post-machining. This processing method has high processing cost and relatively high processing difficulty. Compared with the prior art, the beneficial effects of the utility model are: clamping, top-tightening, and overturning mechanisms. After the welding of each component is completed, the fixing table of the tooling, the arc plate on the second cylinder and the third cylinder will position and lock the components in the sprocket assembly to complete the welding. The tooling has a good locking effect. The sprocket parts can be rotated during welding, which is convenient for welding, and the welding angle of the parts can be fine-tuned through the second bolt to ensure the accuracy, and it is easy to disassemble without affecting the disassembly after welding.