Auxiliary matched ejection device of injection molding machine for plastic part production

Abstract

The invention belongs to the technical field of injection molding machines, and discloses an auxiliary matched ejection device of an injection molding machine for plastic part production, the auxiliary matched ejection device comprises a working platform and an injection molding assembly, a fixed plate is fixedly mounted on the top surface of the working platform, a fixed mold is fixedly mounted on the left side surface of the fixed plate, and a movable mold is inserted into the left end of the fixed mold; an electric control case is fixedly mounted at the left end of the top face of the working platform, and a connecting rod is in transmission connection with the middle of the right end of the electric control case. A power connection pipe makes contact with a power connection terminal to supply power to an electromagnet to generate magnetism, so that an electromagnet blocking shaft moves leftwards, the top end of a connecting air channel is opened, an air pump sucks air in an air bag into the connecting air channel, the air is blown to a plastic product on the right side of a movable mold through guiding of an air outlet pipe, and demolding of the plastic product is achieved; the plastic product is not in contact with the metal part, so that the surface of the plastic product is prevented from being scratched and abraded, and the plastic product is prevented from being damaged.

Description

technical field [0001] The invention belongs to the technical field of injection molding machines, in particular to an auxiliary matching ejector device of an injection molding machine for plastic part production. Background technique [0002] Injection molding machine is the main molding equipment for making thermoplastics or thermosetting plastics into various shapes of plastic products using molding molds. The ejector device is an auxiliary matching device for pushing plastic products out of the molding equipment after the plastic products are formed. [0003] Most of the existing ejection devices are composed of thimbles. When in use, the movable mold is separated to drive the plastic products to move to the thimble. When the movable mold is separated from the fixed mold, the thimble moves to the plastic products, thereby pushing the plastic products out of the movable mold. For the blanking of plastic products, since the thimble is in direct contact with the plastic pro...

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Problems solved by technology

[0003] Most of the existing ejection devices are composed of thimbles. When in use, the movable mold is separated to drive the plastic products to move to the thimble. When the movable mold is separated from the fixed mold, the thimble moves to the plastic products, thereby pushing the plastic products out of the movable mold. For the blanking of plastic products, since the thimble is in direct contact with the plastic product during demoulding, and because most of the thimbles are metal products, the hardness of the thimble is greater than that of the plastic product, and when the thimble is in contact with the plastic product, in order to ensure To be able to demold plastic products smoothly, it is usually necessary to set the moving speed of the thimble relatively fast, so that the thimble may cause scratches and wear on the surface of the plastic product during contact, resulting in damage to the plastic product

[0004] Existing ejection devices realize the demoulding of plastic products by using movable ejector pins in contact with plastic products. However, in actual use, ejector pins are often designed in the middle of plastic products. For plastic products, when the middle part is pushed out by the thimble, the bending parts on both sides are not ejected at the same time, resulting in stress concentration, and the bending part of the plastic product may be twisted when the wall thickness is small , so that the size of the plastic product cannot meet the design requirements, thereby reducing the production quality of the plastic product

[0005] When the existing ejection device is in use, the plastic product falls downwards by driving the movable mold away from the fixed mold to realize demoulding and blanking. However, most of the plastic products fall directly on the working platform, but when injection molding , although the plastic products are cooled, the temperature after cooling is still high. When the operator takes the plastic product, it may cause burns to the operator, thus reducing the safety of the device

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