| 摘要 |
PURPOSE: A cylinder unit of a hot runner system is provided to easily replace a pin guide bush ring without disassembling a clamping plate, thereby reducing the replacement work. CONSTITUTION: A cylinder unit of a hot runner system comprises a cylinder housing(102), a piston(104), a pin cap, a cylinder cover, a pin guide bush ring(110), and a pin guide bush(112). The cylinder housing includes a cylinder housing body, piston flange and cylinder cover joints, a piston body insertion part, and a clamping plate joint. The piston has a piston body, a piston flange part, a valve pin insertion hole, and a pin cap joint hole. The cylinder cover covers the cylinder housing. The pin guide bush ring supports the cylinder housing by contacting the underside of the cylinder housing and guides the pin guide bush. The pin guide bush is fixed to the joint hole of the guide bush ring through the pin guide bush joint.
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