Small ejector pin ejection mechanism and injection mold with same

Abstract

The invention relates to a small ejector pin ejection mechanism. The small ejector pin ejection mechanism comprises a small injector pin, a fixing piece, a guide sleeve and a spring. The small ejector pin is vertically arranged on the fixing piece. The guide sleeve is vertically through, and an inner cavity is formed in the guide sleeve. The fixing piece is arranged in the inner cavity in a vertically moving mode. The fixing piece is sleeved with the spring which enables the fixing piece to keep the trend of moving upward all the time. The ejection mechanism is simple and reasonable in structure and compact in connection. The ejection stroke of the small ejector pin is limited and greatly reduced under the cooperation of the inner cavity of the guide sleeve and the fixing piece, so that the small ejector pin is effectively protected from being broken, the problem that the small injector pin needs to be frequently maintained or replaced is avoided, the service life of the small ejector pin is prolonged, and the service life of the product is prolonged to some degree. According to a mold with the ejection mechanism, the guide sleeve and a fixing plate are installed on the floor, and the small ejector pin and a large ejector pin cooperate with each other, so that the product has operating stability when disengaged from the mold, and the stability of production quality of the product is improved.

Description

technical field [0001] The invention relates to the technical field of medium and large molds for automobiles, in particular to a small thimble ejector mechanism, and also relates to an injection mold using the small thimble ejector mechanism. Background technique [0002] Both the big thimble and the small thimble are accessories in the automotive injection mold, and are used to separate the product from the mold in the plastic mold. Generally, considering the load-bearing capacity and service life of the small ejector pin, when ejecting the product from the mold, a larger ejector pin will be used as much as possible, and the ejection distance must be carefully calculated according to the mold design in advance, so as to avoid the failure of the product due to insufficient ejection stroke. Unable to separate from the mold smoothly. [0003] At present, in automobile molds, medium and large molds such as bumpers, dashboards, side panels, and sub-dashboards often need to use...

AI Technical Summary

Problems solved by technology

[0003] At present, in automobile molds, medium and large molds such as bumpers, dashboards, side panels, and sub-dashboards often need to use small thimbles with a diameter of less than 5mm in the mold structure due to the needs of ejection and exhaust. During the entire ejection stroke in the prior art, the small thimble will move together with the push plate. Due to the long ejection stroke, the small thimble is easy to break and needs to be repaired or replaced frequently. This not only affects the life of the mold, reduces production efficiency, but also lead to an increase in the production cost of the product

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