Recent Patents in the Clamping Unit of Injection Molding Machines
Q. Wang, X. Sun and C. HuangAffiliation:
Tianjin Key Laboratory of high speed cutting and precision machining, Tianjin University of Technology and Education, Tianjin 300222, P.R. China.
AbstractThe clamping mechanism is one of the important components of injection molding machine. The double-toggle clamping unit is applied in clamping mechanism widely. But, the existing double-toggle clamping unit is connected by cross head driven clamping mold oil cylinder. In the process of movement, especially in the open limit position or a front connecting rod close to the vertical position, wear is very serious. It will cause fracture of tail platen easily. The paper reviews various patents of clamping unit of injection molding machine through adopting new structures in recent years. The new structure of the double-toggle clamping is presented in this paper. The new structure provided with four to rod extending connecting lugs. The each connecting ear is provided with corresponding pull rod passes through the guide hole. The cross head can be in sliding sleeve in the four pull rod. Compared with the traditional toggle clamping, the motion of mold platen is stable and the fracture phenomenon of tail platen can be solved. The overall clamping mechanism weight is reduced because of simplifying structure of tail platen. The tail platen manufacturability, reliability is improved and the manufacturing cost is reduced due to saving “A” frame of tail platen.
Clamping mechanism, cross head, double-toggle, injection molding machine, optimization design
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