Water-assisted injection-molding injecting device having pressure detection function

Abstract

The invention discloses a water-assisted injection-molding injecting device having a pressure detection function. The water-assisted injection-molding injecting device comprises a screw injector, a mold and a water needle device; a screw of the screw injector is divided into a feeding section, a compression section and a metering section; the water needle device comprises a water needle core rod and a water needle pedestal; the water needle pedestal is provided with a water charging passage and a water pressure detecting device; a water feeding clearance is formed between the water needle corerod and the water needle pedestal; the water feeding clearance is connected with the water charging passage and a mold cavity; the mold is provided with a pouring gate; a pressure sensor is arrangedat the pouring gate; and the water pressure detecting device and the pressure sensor are connected with the screw injector. The water-assisted injection-molding injecting device disclosed by the invention adopts an injecting device body which has a pressure detection function, is simple in structure and can prevent a high-molecular molten body from blocking a water needle; a screw controller can be used for precisely controlling the returning pressure of the screw, so the character consistency of polymer molten bodies is guaranteed.

Description

technical field [0001] The invention relates to the field of injection molding, in particular to an injection device with pressure detection for water-assisted injection molding. Background technique [0002] Gas-assisted injection molding is a technology that injects an inert gas into a mold cavity containing a melt to obtain a hollow product. This technology can reduce warping deformation and surface dents of the product, reduce quality, reduce cost, and shorten the molding cycle. . At present, gas-assisted injection molding is widely used in various manufacturing fields of automobiles, furniture, home appliances and daily necessities. However, this technology has defects: it cannot produce large-diameter products; the products produced have thicker walls; products need to be cooled for a long time. Risk of foaming of the melt. [0003] Gas is compressible while water is incompressible. The thermal conductivity of water is about 40 times that of gas, and the specific hea...

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Problems solved by technology

[0005] In order to overcome the defects in the existing technology that the water-assisted injection molding water needle device is easy to block, and the reflowed polymer melt is difficult to achieve the same properties as the original polymer melt in the barrel, the present invention provides a water-assisted Injection molding injection device with pressure detection adopts a water needle device with a movable water needle core rod. Through the movement of the water needle core rod, the opening and closing of the water injection port of the water needle device is controlled to avoid the blockage of the water needle.

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