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Tian Fuxiang, He Bin (Qingdao Polytechnic University,Qingdao 266033, China)  
The structure of the injection mould with automatic thread demoulding by the chain gear transmission is given. The mould is designed to take advantage of hot runner with the needle-valve type of pin-point gate, having no runner scraps. Chain gear transmission is adopted to turn the threaded core and the frictional force in the end surface is made to prevent the plastic part from turning so that the automatic thread demoulding is achieved. Three sets of cooling system are set up in the moving cavity, fixed cavity and threaded core so the mould is cooled even. The mould structure is compact, the operation is reliable and convenient, the cool result is good, and the intensity of labor is reduced. So the production efficiency is increased and the accuracy of the plastic part is high.
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