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上海第一塑料机械厂生产的SZ-150/100注塑机,采用了组合式活塞环,注射与预塑功能良好,解决了注塑机的直线注射和旋转预塑同机进行的问题,简化了机构,提高了传动效率。组合活塞环由2只外环和1只内环组成,如图1所示。它是依靠两层金属环弹性变形的涨力压紧在油缸内表面上实现双道密封作用的。其特点是密封结构紧凑、摩擦力小、寿命长、密封性能高、应用范围广。在相同条件下,比普通活塞环少2～3环,阻力降低50％,适用于密封性能要求高以及螺旋运动的密封场合。组合活塞环的技术要求是:材料用铜铬钼耐磨铸铁,经T235热处理;活塞环切口压紧
SZ-150/100 injection molding machine produced by Shanghai No. 1 Plastic Machinery Factory adopts a combined piston ring, which has good injection and pre-plasticization functions and solves the problems of linear injection and rotary pre-molding of the injection molding machine, simplifies the mechanism , Improve the transmission efficiency. The combined piston ring consists of two outer rings and one inner ring, as shown in Figure 1. It relies on two layers of metal ring elastic deformation of the force compression in the cylinder surface to achieve dual-channel sealing effect. It is characterized by tight seal structure, small friction, long life, high sealing performance, wide range of applications. Under the same conditions, less than the ordinary piston ring ring 2 to 3, the resistance reduced by 50%, suitable for sealing performance requirements and spiral seal occasions. The technical requirements of the combined piston ring are: copper chrome molybdenum wear-resistant cast iron materials, the T235 heat treatment; piston ring incision compression