Laminated hot runner pouring device for plastic inspection well seat injection mold

Abstract

The invention relates to a laminated hot runner pouring device for a plastic inspection well seat injection mold. The laminated hot runner pouring device comprises a fixed mold plate, a movable mold plate group, a mold core with a U-shaped hollow cavity structure, a main runner sprue bush, a laminated hot runner system and the like. The laminated hot runner system comprises m layers of sub-runner plates located in the hollow cavity of the mold core and main runner blocks located between every two adjacent sub-runner plates, wherein multiple sub-runner holes distributed in a radial shape are formed in the sub-runner plates from main runner holes of sub-runner plates to the circumferential surfaces of the sub-runner plates. M layers of sprue groups are arranged on the circumferential surface of the mold core and comprise sprues which are as many as the sub-runner holes and communicated with a mold cavity. The sub-runner holes are communicated with the sprues in corresponding positions through hot nozzles; a sprue bush main runner hole is communicated with the sub-runner plates and the main runner blocks. According to the laminated hot runner pouring device, the flowing distance of melt in the mold cavity is reduced, so that the mold cavity can be quickly filled with plastic melt, injection molding pressure is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a plastic inspection well seat injection mold laminated hot runner pouring device, which is suitable for injection molding of super-large and super-high plastic inspection well seats. Background technique [0002] Super-large and super-high plastic inspection wells have been widely used in the construction of municipal road pipe networks. Plastic inspection wells are generally composed of manhole covers, well chambers and well seats. For super-large and super-high plastic inspection well seats, the mass is tens of kilograms The injection mold gating system is the key to the injection molding process. Due to the huge injection volume and the long flow distance of the plastic melt in the mold cavity, the existing injection mold Molding technology, injection molding problems such as insufficient cavity filling and insufficient injection pressure are difficult to solve. [0003] At present, plastic inspection well seat injection m...

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Problems solved by technology

[0002] Super-large and super-high plastic inspection wells have been widely used in the construction of municipal road pipe networks. Plastic inspection wells are generally composed of manhole covers, well chambers and well seats. For super-large and super-high plastic inspection well seats, the mass is tens of kilograms The injection mold gating system is the key to the injection molding process. Due to the huge injection volume and the long flow distance of the plastic melt in the mold cavity, the existing injection mold Molding technology, injection molding problems such as insufficient cavity filling and insufficient injection pressure are difficult to solve

[0003] At present, plastic inspection well seat injection molds are mainly based on large-diameter straight sprue cold-runner gating systems, but large-diameter straight sprue cold-runner gating systems require higher injection pressure and speed, and longer cooling time. Time, injection molding cycle is long, production efficiency is low, and the thick pouring system condensate on the product is difficult to remove. In particular, since the flow length ratio of the plastic melt is generally not greater than 200, the flow distance of the plastic melt in the cavity is limited. Therefore, For inspection wells whose outer diameter and height are both greater than 1 meter, it is difficult to use straight sprue cold runner gating system for injection molding

[0004] Hot runner technology has been widely used in large-scale plastic pipe fitting injection molds, such as Chinese patent application number ZL201510024765.3, which provides a large-scale PVC plastic pipe fitting injection mold hot runner disc pouring device. The multi-gate, multi-gate is conducive to the rapid filling of the mold cavity with plastic melt, but because the gate is set at the upper port of the cavity, similar to the straight gate cold runner gating system, the melt flows in the cavity The distance is still long, and for super-large and super-high plastic inspection well bases, this device cannot better solve the problem of insufficient filling of the melt in the cavity

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