A mechanical limit ejection device for a mold

Abstract

The invention provides a mechanical type mold limiting jacking device which belongs to the technical field of die-casting molds, and solves the technical problem that an injection molded piece is likely to be broken when being pulled as springs in the conventional jacking device are likely to be invalid and the injection molded piece cannot be completely jacked out. The mechanical type mold limiting jacking device comprises a fixed mold bottom plate, wherein a jacking needle plate and a lower needle plate are arranged on the fixed mold bottom plate; a screw cylinder is arranged on the jacking needle plate; the screw cylinder penetrates through the lower needle plate; jacking needles are fixedly arranged on the fixed mold bottom plate; the jacking needles penetrate through the screw cylinder; the upper end surface of the jacking needles exceeds the upper end surface of the screw cylinder; a lifting mechanism is fixedly arranged on the lower needle plate; the lifting mechanism is movably connected with the jacking needle plate and is used for jacking out the needle plate to lift up the lower needle plate; when the jacking needle plate drives the screw cylinder to rise up and the upper end of the screw cylinder is parallel to the upper end of the jacking needles, the lifting mechanism is separated from the jacking needle plate. The device has the benefits that the device is not affected by the fact that the springs are likely to be invalid, so that the injection molded piece can be safely and completely jacked out, and the injection molded piece is prevented from being broken when being pulled.

Description

technical field [0001] The invention belongs to the technical field of die-casting molds, and relates to an ejection device, in particular to a mechanical limit ejection device for a mold. Background technique [0002] Die-casting process is a high-efficiency and less metal-cutting forming process. Die-casting process is used to produce various metal parts in modern industry. It has unique technical characteristics and significant economic benefits. The principle of die-casting process is to use high pressure to The molten metal is pressed into the cavity of a precision metal mold with a specific shape at high speed. The molten metal is cooled and solidified under the action of pressure. After the molten metal solidifies, the die-casting mold is opened, and the casting is taken out to complete a die-casting cycle. [0003] Die-casting has high production efficiency and can die-cast injection molded parts with complex shapes, precise dimensions, clear outlines, high surface q...

AI Technical Summary

Problems solved by technology

[0003] Die-casting has high production efficiency and can die-cast injection molded parts with complex shapes, precise dimensions, clear outlines, high surface quality, strength, and hardness. In order to facilitate the removal of injection molded parts and not damage the shape and surface integrity of injection molded parts when taking out injection molded parts , the mold is generally equipped with an ejection mechanism, which can safely eject the die-cast casting out of the mold, and effectively protect the injection molded part from damage as a whole. The needle assembly includes a thimble and a cylinder. The interior of the cylinder is hollow. The cylinder is installed on the ejector plate and fixedly connected with the ejector plate. The lower end of the injection molded part has a downward protruding ejector cylinder. Installed on the bottom plate and pass through the inside of the cylinder and the top of the thimble is inserted into the injection molded part to withstand it. The thimble plate is installed on the upper surface of the bottom plate. A spring is installed between the thimble plate and the bottom plate. Under the action, the top of the cylinder moves upwards, and the top of the cylinder touches the lower surface of the ejector cylinder and moves upward with the ejector plate to push the injection molded part upwards against the cylinder so that the ejector cylinder is separated from the ejector pin, and finally the injection molded part is ejected. Although this ejection structure The injection molded parts can be ejected, but there are still the following problems: because the upward movement of the ejector plate is realized by the elastic force of the spring, and the elastic force of the spring will continue to weaken and fade during the long-term telescopic movement, and in this case, Since the self-gravity of the ejector plate remains unchanged, the spring cannot push the ejector plate to the predetermined height when the elastic force is weakened, and the cylinder cannot completely eject the injection molded part out of the range of the ejector pin, resulting in a part of the ejector pin remaining on the ejector cylinder of the injection molded part If the injection molded part is not fully ejected, if the staff moves the injection molded part at this time, the injection molded part will be damaged, resulting in serious damage to the injection molded part

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