Valve needle nozzle core structure for hot runner and hot runner system containing structure

Abstract

The invention relates to a valve needle nozzle core structure for a hot runner and a hot runner system containing the structure, and belongs to the technical field of injection molding devices. The valve needle nozzle core structure for the hot runner comprises a hot nozzle body; the hot nozzle body is internally provided with a molten rubber material channel, a nozzle core in communication with the molten rubber material channel is connected at the lower end of the hot nozzle body, a glue injection port of a forming mould is connected at the lower end of the nozzle core in a sealed mode to form a complete glue injection flow channel; a valve needle is arranged in the molten rubber material channel, the valve needle can pass through the nozzle core and use the lower tip of the nozzle coreto block the glue injection port of the forming mould, the nozzle core comprises an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder are connected by connecting bars with circumference uniform distribution between the inner tube and the outer tube, a gap formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder constitutes the molten rubber material channel of the nozzle core, the valve needle is arranged in the inner wall of the inner cylinder in a penetrating mode, and the outer diameter of the valve needle is in clearance fitwith the inner diameter of the inner cylinder. According to the valve needle nozzle core structure for the hot runner and the hot runner system containing the structure, the injection effect is good,a finished product has no yellowing, and impact of the valve needle against the mould can be reduced to prolong the service life of the mould.

Description

technical field [0001] The invention belongs to the technical field of injection molding devices, and in particular relates to a valve needle nozzle core structure for a hot runner and a hot runner system containing the structure. Background technique [0002] In the injection mold, the hot runner injection molding device is the most important part. The outlet of the general hot runner is mainly arranged with a hot nozzle body, a nozzle core, and a valve needle. During injection molding, molten resin is injected into the hot runner through the injection molding machine, and then passed through the nozzle The core is sprayed into the mold. After the injection molding is completed, the valve needle drives the valve needle to push out downwards, so that the nozzle core can be extended from the top to withstand the injection port of the mold to achieve the purpose of sealing, preventing the resin from overflowing and affecting the molding, such as figure 1 Show. However, in pra...

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Problems solved by technology

[0003] Therefore, in order to solve the problems in the above-mentioned prior art that the tip of the valve needle is rubbed by high-pressure and high-speed jet flow to generate heat, thereby exceeding the required temperature, causing the rubber material at the sealant to turn yellow and the long valve needle to be heated and expanded, causing the tip of the valve needle to collide and destroy the injection mold of the mold. The inner wall of the rubber cone mouth will eventually cause the problem of poor appearance of the injection molded product. The invention provides a valve needle nozzle core structure for a hot runner

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