Lever prying acceleration device for asynchronous and different-speed ejection of double knockout plates

Abstract

The invention discloses a lever prying acceleration device for asynchronous and different-speed ejection of double knockout plates. The lever prying acceleration device comprises a bearing seat (1), a fulcrum shaft (2) and an arm lever (3). According to the invention, the bearing seat slides upwards to pass through a lower knockout plate and is then fixedly arranged under an upper knockout plate by the lever prizing acceleration device consisting of the bearing seat, the fulcrum shaft and the arm lever, wherein the arm lever is positioned below the lower knockout plate; with a die pedestal asa support point of a resistance arm of the arm lever, when the lever prying acceleration device is applied, a tail knockout pillar pushes the upper knockout plate to eject out first, and the lower knockout plate which is later than the upper knockout plate is prized by a power arm of the arm lever so as to accelerate ejection of the lower knockout plate, and therefore the technical scheme that the upper knockout plate and the lower knockout plate finish the same ejection stroke simultaneously is realized, the problems and defects of complex mechanism, large size, low cost and low reliability in the prior art are overcome; and an injection mode with asynchronous and different-speed ejection of the double knockout plates achieves the purposes of simplifying mechanism, reducing size and costand improving reliability in a lever prizing acceleration way.

Description

technical field [0001] The invention relates to a demoulding and ejecting device of an injection mold, specifically refers to an injection mold with upper and lower double top plates for asynchronous ejection, the lower top plate that is pushed out later is accelerated and the upper top plate that is ejected earlier arrives at the same time A lever prying acceleration device for asynchronous and different-speed ejection of double top plates. Background technique [0002] The top plate in the injection mold is the part that carries the ejector pin and the ejector block for the ejection movement of the product. Some injection molded products need to be ejected and demoulded step by step. The ejector pins are ejected later, and the ejector pins ejected successively must complete the same ejection stroke at the same time, which requires that the ejection speed of the ejector pins ejected later should be greater than the ejection speed of the ejector pins ejected earlier, because...

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Problems solved by technology

[0002] The top plate in the injection mold is the part that carries the ejector pin and the ejector block for the ejection movement of the product. Some injection molded products need to be ejected and demoulded step by step. The ejector pins are ejected later, and the ejector pins ejected successively must complete the same ejection stroke at the same time, which requires that the ejection speed of the ejector pins ejected later should be greater than the ejection speed of the ejector pins ejected earlier, because The ejector rod is carried by the top plate. In other words, it is required that the ejection speed of the top plate ejected later should be greater than the ejection speed of the top plate ejected earlier, that is, the so-called "asynchronous ejection at different speeds"; The upper and lower double top plates are set in the middle to realize asynchronous ejection, and the lower top plate is assisted by an oil cylinder to achieve different speed ejection. The mechanism of this scheme is complex, large in size, high in cost, and prone to failure during application, with low reliability and affects production efficiency. Therefore, the prior art has the problems and deficiencies of complex mechanism, large volume, high cost and low reliability

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