Anti-whitening injection mould ejection device for ejector sleeve recoiling limiting of deep-cavity plastic part

Abstract

The invention discloses an anti-whitening injection mould ejection device for ejector sleeve recoiling limiting of a deep-cavity plastic part. The anti-whitening injection mould ejection device structurally comprises pin hole slots, an injection moulding groove, a gas pipe, a pedestal, an ejecting groove, ejecting ejector sleeve columns and a square shell, wherein the bottoms of the ejecting ejector sleeve columns are inserted and embedded into the top surface of the pedestal; spring columns of the ejecting ejector sleeve columns are nested into the ejecting groove. Through coordination of sucking disc bases and trifurcated pipe brackets, gas enters from the bottoms of trifurcated valve cores and then is discharged from the left and right sides to arc-shaped side pipes for discharge; the arc-shaped side pipes stretch telescopic groove joint rings in a recoiling manner to eject through thimble rods; clamping blocks and semispherical clamping blocks are matched with the through thimble rods, lift to limiting arc-shaped plates and are positioned and clamped so as to prevent excessive lifting and avoid ejecting the plastic part; the trifurcated valve cores eject a gas path to branch-pipe gas conveying slots; in the ejecting process, roller wheels drive arc-shaped supporting tables to rotate and the side edges of fitting curved surfaces are lowered to prevent scratching the inner wall of a mould to from a whitening phenomenon; then, through up-and-down recoiling permeability of gas-permeable membranes, the deep-cavity plastic part is adsorbed so as to achieve steady ejection.

Description

technical field [0001] The invention relates to an ejection device for an anti-stretching injection mold of a deep-cavity plastic part, which is recoil-limited and belongs to the field of mold ejection devices. Background technique [0002] Deep-cavity plastic parts of injection molds, such as U-shaped plastic parts of horseshoe boards, are plastic parts with depth requirements for shapes. They are deeper than ordinary injection molding cavities. Deep-cavity plastic parts often shrink the top of the plastic part due to the heat generated by injection molding. Forming structure, so the U-shaped structure will shrink into a C-shaped, making it difficult for the thimble to eject the deep-cavity plastic parts. The shortcomings of the current technology to be optimized are: [0003] Due to the shrinkage of the top of the deep cavity plastic part, the pressure at the bottom of the parting surface is too high, causing the thimble and the cylinder to be jammed. The surface of the t...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide an anti-stretch ejection device for an injection mold ejection device for the recoil limit of the cylinder of a deep cavity plastic part, so as to solve the problem of the bottom of the parting surface caused by the shrinkage of the top of the deep cavity plastic part. If the pressure is too high, the thimble and the barrel will be jammed, and only the thimble acting on the side surface will be ejected, causing the side of the plastic part to be rubbed and slightly deformed, causing the surface of the thimble to be slightly higher than other places with the naked eye. And there is a problem with white marks

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