Screw rod of injection molding machine

Abstract

The invention relates to the technical field of injection molding machines, in particular to a screw rod of an injection molding machine. The screw rod comprises a rod body. The rod body is provided with helical screw arrises. The front end of the rod body is detachably connected with an embedded rod which can be replaced according to different injection molding materials. The embedded rod is provided with screw arris patterns. The end, close to the rod body, of the embedded rod is provided with a conical embedding part embedded into the rod body. The axial center of the front end of the embedding part is provided with a thread connecting part which protrudes towards one side of the rod body and is connected with the rod body. The rod body is provided with an embedding cavity matched withthe embedding part structure. The embedding cavity is internally provided with a connecting cavity matched with the thread connecting part. A locking mechanism for maintaining the connecting state ofthe embedded rod and the rod body is arranged at the connecting position of the embedding part and the embedding cavity. The locking mechanism comprises a locking groove formed in the inner wall of the embedding cavity and a locking protrusion arranged at the corresponding position on the embedding part. The locking protrusion is exactly clamped into the locking groove after the thread connectingpart and the connecting cavity are tightened in a threaded mode. The matching precision between the embedded rod and the homogenizing section of the rod body is high, connecting is reliable, and the quality of injection molding of a product is improved.

Description

technical field [0001] The invention relates to the technical field of injection molding machines, in particular to an injection molding machine screw. Background technique [0002] The screw is one of the core components of the injection molding machine. Its main function is to convert solid plastic particles or powder into a stable and uniform plastic melt through the conveying section (feeding section), compression melting section, and homogenization section, and then output it to the die head and Auxiliary equipment to produce products that meet the requirements. The design of the injection molding screw is generally a three-section single-tooth or double-tooth (barrier) screw, which is divided into a feeding section, a compression section and a homogenization section (ie, a discharge section). When making common materials such as PC, PP, PS, PE, PU, ​​PMMA, PP+ABS, etc., it is generally designed as a single tooth screw. But when these materials need to add toner or / an...

AI Technical Summary

Problems solved by technology

That is to say, when the existing screw for injection molding machine is used to add toner or color masterbatch, another screw suitable for adding toner or color masterbatch is made, and this screw is suitable for adding toner or color masterbatch. At this time, because the material decomposes due to excessive shearing in the barrier section, resulting in defective products, this kind of screw cannot be used. In order to solve this problem, a replaceable mosaic rod structure is designed at the homogenization section. According to Different injection materials, choose different structures of mosaic rods, so as to solve the problem of color mixing

[0003] However, the existing inlaid rods are generally only connected to the rod body through thread fit, and the connection accuracy is poor, which easily leads to unstable material flow rate and affects the quality of injection molding products. There will be friction and mutual movement between the bottom surface of the groove, the propulsion surface of the screw edge, and the plastic and the plastic, which will cause the inlaid rod and the rod body to be easily disengaged, resulting in damage to the machine

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