Mechanism of plastic rubber mold and compressed-air linked ejection mechanism

Abstract

The invention discloses a die mechanism with compressed air linkage push-out added on an original ejection mechanism. Two ends of a support block of a traditional die are respectively provided with a sealing plate. A jacking block sealed with an ejector hole of a bottom plate is arranged under a lower ejector retainer plate to form a sealing space (air chamber for short) among a core plate, the bottom plate and the sealing plate. The air chamber is connected with the compressed air through a valve control mechanism. An axial blowing groove is arranged on an ejector retainer. The bottom of the blowing groove is communicated with the air chamber, and the top part is certain distance away from a formed part. During the push-out, the ejector retainer is driven by an ejector to be pushed out for a certain distance. A plastic part is detached from the formed part. Then, the valve control mechanism leads the compressed air to enter the air chamber. Meanwhile, the top end of the blowing groove on the ejector retainer is higher than a formed surface. Blowing force can be applied on the plastic part by the compressed air through the air chamber and the blowing groove to lead to the detachment of the plastic part from the ejector retainer. The die mechanism can be applied to dies of formed miniature products. One time of the push-out can lead to the total detachment of the plastic part from the die. Small products can be prevented from being absorbed by the ejector retainer to be demoulded hardly.

Description

【Technical field】 [0001] The invention relates to the field of plastic injection molding, and is especially suitable for using an injection mold on a horizontal injection molding machine. 【Background technique】 [0002] The ejection of the plastic parts on the general plastic injection mold is realized by ejector pins, but when molding some small products, the plastic parts are easy to adhere to the ejector pins during ejection, and it takes several ejections to make the plastic parts detached from the ejector pins , Sometimes it is difficult to get the plastic part out of the mold even after many times of ejection. The solution that people usually adopt nowadays is to install an air blowing nozzle on the side of the movable mold, and use compressed air to blow the air when the mold is ejected after the mold is opened. This method has the following disadvantages: the compressed air will In a radial shape, the blowing force acting on each hole is uneven. The product closer t...

AI Technical Summary

Problems solved by technology

[0002] The ejection of the plastic parts on the general plastic injection mold is realized by ejector pins, but when molding some small products, the plastic parts are easy to adhere to the ejector pins during ejection, and it takes several ejections to make the plastic parts detached from the ejector pins , sometimes it is difficult to get the plastic part out of the mold even after many times of ejection

The solution that people usually adopt nowadays is to install an air blowing nozzle on the side of the movable mold, and use compressed air to blow the air when the mold is ejected after the mold is opened. This method has the following disadvantages: the compressed air will In a radial shape, the blowing force acting on each hole is uneven. The products closer to the air nozzle receive a greater blowing force, causing them to be blown around, while the products farther away from the air nozzle are subjected to blowing force. Less force, difficult to disengage the thimble

Moreover, this structure requires an additional electrical control device to control the opening and stopping of blowing.

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