Self-recovery type anti-overflow spray nozzle

Abstract

The invention discloses a self-recovery type anti-overflow spray nozzle. The self-recovery type anti-overflow spray nozzle is composed of main components including a spray nozzle cap, a spray nozzle body, a valve element and a spring. The self-recovery type anti-overflow spray nozzle is characterized in that in the plastic injection process, a hydraulic device pushes a threaded rod to move forward, and a high-pressure plastic injection glue melting area is formed in the spray nozzle cap which is sealed originally; high-pressure molten glue acts on the stress surface of the valve element, thrust is generated, the spring is compressed, and the valve element is made to move towards the spring; the blocking slope of the valve element retreats from a corresponding anti-overflow slope at the inner side of the spray nozzle cap at the moment, and a plastic injection channel is in an opened state; the molten glue is injected into a cavity in a die through the plastic injection channel in the spray nozzle body until plastic injection is completed; when the glue melting process starts, due to the fact that the hydraulic device drives the threaded rod to retreat, the pressure in the high-pressure glue melting area in the spray nozzle cap is relieved, under the effect of elastic force of the spring, the blocking slope of the valve element is pushed towards the corresponding anti-overflow slope again and attached to the anti-overflow slope, and the plastic injection channel is in a closed state; the plastic injection channel is blocked, so that the molten glue cannot overflow from the plastic injection channel, and it is guaranteed that the production process of products can be completed smoothly.

Description

technical field [0001] The invention relates to an injection molding machine part, in particular to a self-returning anti-overflow nozzle. Background technique [0002] At present, the nozzle is an important part of the injection head in the injection molding machine. Usually, during injection molding, after the barrel is heated, the plastic particles are put into the barrel from the inlet, and the plastic particles are sent to the barrel through the screw rotation in the injection head. On one side of the screw head, the heating device melts the plastic particles continuously, and then the screw is driven by the hydraulic device, and the molten plastic is injected into the cavity of the mold through the nozzle to complete the injection molding action of the machine. However, some plastics will overflow from the nozzle during the melting process, and will stick to the mold, which will cause inconvenience to the mold production, and even cause product scrapping and mold damag...

AI Technical Summary

Problems solved by technology

However, some plastics will overflow from the nozzle during the melting process, and will stick to the mold, which will cause inconvenience to the mold production, and even cause product scrapping and mold damage

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