Auxiliary injection device of injection molding machine

Abstract

The invention discloses an auxiliary injection device of an injection molding machine. The auxiliary injection device is arranged on the injection molding machine and is connected with a mold on the injection molding machine, and comprises a melting delivery mechanism, a melt injection mechanism and a plunger charge pipe mechanism. The melting delivery mechanism and the melt injection mechanism are respectively connected with the plunger charge pipe mechanism. The melting delivery mechanism comprises a melting screw for delivering an injection molding material and heating elements for melting the injection molding material. The melt injection mechanism comprises a plunger for injecting the melt. The plunger charge pipe mechanism is provided with a melting passage, a plunger passage and an injection passage which are in intersection; the melting passage is communicated with a plasticizing cavity containing the melting screw, the plunger slides in the plunger passage in a sealed manner, and the injection passage is communicated with an injection cavity in the mold. As the V-shaped structure of feeding by the screw and injecting by the plunger, molten resin is delivered stably and then plasticized uniformly; besides, metering is realized, and the plunger moves forwards and prevents reverse flow of the molten resin through a one-way mechanism after metering is finished, thus, precise injection is achieved.

Description

technical field [0001] The invention relates to the field of injection molding machines, in particular to an auxiliary injection device for injection molding machines, which is applied to injection molding products in industries such as auto parts and home appliances. Background technique [0002] The traditional two-color injection molding machine uses two independent injection mechanisms to plasticize two different plastics in two barrels, and is equipped with a turntable to work alternately to form two different colors or different plastics (such as a hard material) Plastic, a soft plastic). However, compared with single-color injection molding machines, two-color injection molding machines have high cost and complex structure. [0003] With the increasing application of two-color injection molding products with local micro-inserts in auto parts, home appliances and other industries, many injection molding manufacturers are often troubled by problems such as high cost of...

AI Technical Summary

Problems solved by technology

This structure adopts the method of mixing different color masterbatch raw materials on the way of injection molding raw materials entering the mold, and can inject two-color plastic products at one time, but it has certain limitations, and the injection molding effect is poor

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