Rack double ejection device

Abstract

The invention discloses a rack double ejection device. The rack double ejection device comprises a gear (1), an ejection rod rack (2) and a carrier plate rack (3). When the rack double ejection device comprising the above members is in work, a tail column of an injection molding machine pushes an ejection plate and drives a material head pulling and ejecting rod and a product ejecting rod to slowly push forward a product and a cold material head for de-molding; when the product and a mold core are loosened, the gear moving forward along with the ejection plate meets with the carrier plate rack and is engaged with the carrier plate rack, the ejection rod rack drives the product ejecting rod to push the product to depart from the mold core at a speed which is twice the speed of moving forward the ejection plate and the material head pulling and ejecting rod under the rotation action of the mutual engagement of the gear, the ejection rod rack and the carrier plate rack; and meanwhile, according to the technical scheme that the product and the cold material head are cut and separated by utilizing speed difference between the product and the cold material head, double ejection of a mold not only can improve the de-molding efficiency but also can be used for automatically cutting and separating the product and the cold material head, so that the purposes of improving the de-molding efficiency, reducing the working intensity, saving the time and labor, and lowering the cost are achieved.

Description

technical field [0001] The invention relates to an ejection and demoulding device for an injection mold, in particular to a rack for ejecting and demoulding a deep-cavity product with a relatively large coating force and a relatively deep coating length by an injection mold in two stages. Ejection device. Background technique [0002] For the ejection and demoulding of deep-cavity products with large coating force and deep coating length, the prior art adopts a lever secondary ejection device, that is, the ejector pin is first slowly ejected with the top plate, so that the coating The product on the core is loose, and then the lever-type seesaw is used to pry the ejector rod to accelerate the ejection of the loose product from the core, shorten the time of the entire ejection process, and improve the efficiency of product demoulding; due to the lever The accelerated ejection distance of prying products is limited. For deep injection molded products with a deep coating lengt...

AI Technical Summary

Problems solved by technology

[0002] For the ejection and demoulding of deep-cavity products with large coating force and deep coating length, the prior art adopts a lever secondary ejection device, that is, the ejector pin is first slowly ejected with the top plate, so that the coating The product on the core is loose, and then the lever-type seesaw is used to pry the ejector rod to accelerate the ejection of the loose product from the core, shorten the time of the entire ejection process, and improve the efficiency of product demoulding; due to the lever The accelerated ejection distance of prying products is limited. For deep injection molded products with a deep coating length, the shortened ejection time is also limited, so the efficiency is not much improved; in addition, due to the limited ejection distance of lever acceleration , it is difficult to separate the product from the cold material head by using the distance difference between the material head pulling ejector rod ejected slowly with the top plate and the product ejector rod ejected with the lever-type acceleration, so it still needs to be labor-intensive and labor-intensive. Time-consuming, low-efficiency, and high-cost manual material cutting, therefore, the existing technology has the problems and deficiencies of low demolding efficiency, high work intensity, time-consuming, and high cost

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