Simple and reliable water injection device for water-assisted injection molding

Abstract

The invention discloses a water injection device for water-assisted injection molding, and the water injection device is simple in structure and reliable in action. The water injection device comprises a plug 1, a valve body 2, a seal pad 3, a diameter-variable high-pressure water pipe joint 4, a position-adjustable flange 5, a valve core 6, an SDA thin air cylinder 7, an adjusting nut 8, an air cylinder joint 9, a shaft coupler 10, a shaft coupling pin 11, an air cylinder mounting bracket 12, an O-shaped seal ring 13, a rectangular seal ring 14, a valve body mounting bolt 15, bracket mounting pads 16 and bracket mounting bolts 17. The end surface of the valve core is designed to be conical, so that the phenomena of difficulty for water injection and high-pressure water advancing direction deviation caused by solidification of molten plastics near a water injection hole can be removed and reliable water injection and accurate water injection direction are guaranteed; the conical surfaces of the valve core and the valve body are clung to each other, and various auxiliary seal rings are arranged on the valve core, so that a needle valve is guaranteed to excellently seal up sizing materials and water; an air cylinder is adopted to drive a valve needle to be started / stopped, and the action is reliable; the water injection device is suitable for water-assisted injection molding and similar processes.

Description

technical field [0001] The invention relates to a simple and reliable water injection device for water-assisted injection molding, which can be used for experiments and production of water-assisted injection molding and similar processes. Background technique [0002] In the water-assisted injection molding process equipment, the water injection device is an indispensable core component. The design of the water injection device is very rare at home and abroad, and the technology is not yet mature. With the increasing maturity of water-assisted injection molding technology research, the design of water injection device has become particularly important. The existing water injection device for water-assisted injection molding is generally a water needle, which has a simple structure, but there are the following problems: the sealing method of the inner and outer cylindrical surfaces makes the machining accuracy and installation accuracy of the valve core and valve body very hi...

AI Technical Summary

Problems solved by technology

The existing water injection device for water-assisted injection molding is generally a water needle, which has a simple structure, but there are the following problems: the sealing method of the inner and outer cylindrical surfaces makes the machining accuracy and installation accuracy of the valve core and valve body very high. The processing difficulty and manufacturing cost of the water needle are increased; the sealing method using a simple O-ring seal cannot meet the sealing requirements for high-pressure water; when the water injection delay time is long and the injection water pressure is low, the The molten plastic at the end of the needle freezes and solidifies, resulting in difficulty in water injection and deviation of the forward direction of the high-pressure water; the opening of the water needle is driven by high-pressure water pressure, and the closing is driven by a compressed spring, which makes it difficult to ensure the timeliness and reliability of the needle valve action , and there is a danger of melt entering the valve body during molding

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