Reversed buckle withdrawing mechanism

Abstract

The invention relates to a back-off withdrawing mechanism, which comprises an ejector plate, which moves under the action of a power device; the hanging needles are provided with a first hanging needle, a second hanging needle and a third hanging needle which are all fixed on the ejector plate and are used for pushing the first angle pin, the straight ejector and the second angle pin to move under the action of the ejector plate; the angle pin is provided with a first angle pin and a second angle pin, the first angle pin is arranged on the first hanging needle and provided with a first convex block used for ejecting a product and withdrawing a first inverted buckle of the first angle pin, and the second angle pin is arranged on the third hanging needle and provided with a second convex block used for ejecting the product and withdrawing a second inverted buckle of the second angle pin; and the straight ejector is arranged on the second hanging needle, is provided with a concave block and is used for ejecting a product and simultaneously withdrawing from a rib position of the straight ejector. The invention has the beneficial effects that the first inclined pin, the straight ejector and the second inclined pin move at the same time, so that the straight ejector withdraws from the first inverted buckle and the second inverted buckle of the product while ejecting the product, and the straight ejector withdraws from the rib position forcibly; and the other structures of the product cannot be interfered, so that the production molding of the product can be realized.

Description

[Technical field]

[0001] The invention relates to the technical field of mold mechanisms, in particular to an undercut ejection mechanism. [Background technology]

[0002] Injection molded products usually have many undercuts due to their appearance or functional requirements, such as Figures 1-2 The product shown is provided with a first undercut 50, a rib 60, and a second undercut 70, wherein the rib 60 is a necessary structure of the product, but this structure will interfere with the withdrawal of the oblique pin when the product is formed, and the local structure of this product cannot be cancelled or changed. Therefore, the general undercut withdrawal mechanism cannot be used for forming because it cannot meet the production requirements of the product.

[0003] In view of this, it is necessary to provide a reverse deduction withdrawal mechanism to solve the above problems. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is that when there is interference from other structures in the undercut exit direction of the injection molded product, the local structure cannot be cancelled or changed, so the general undercut exit mechanism cannot be used for molding, and thus cannot meet the production requirements of the product. Therefore, the present invention provides an undercut exit mechanism to solve the above problem.

[0005] The solution of the present invention to solve the technical problem is: a reverse buckle withdrawal mechanism, comprising:

[0006] A female mold, which cooperates with the male mold to form a product;

[0007] The male mold is provided with an ejection mechanism, including: an ejection plate, a hanging pin, an inclined pin and a straight ejector; wherein,

[0008] An ejector plate, which can move in the male mold under the action of a power device, and can drive the hanging pins fixed on the ejector plate to move together under the action of the power device;

[0009] A hanging pin, wherein the hanging pin is provided with a first hanging pin, a second hanging pin and a third hanging pin, one end of the first hanging pin, the second hanging pin and the third hanging pin are respectively fixed to the ejection plate, and the other end thereof is respectively fixed with a first oblique pin, a straight ejector and a second oblique pin, for pushing the first oblique pin, the straight ejector and the second oblique pin to move under the action of the ejection plate;

[0010] The oblique pin is provided with a first oblique pin and a second oblique pin, one end of the first oblique pin is fixed on the first hanging pin, and the other end is located at one end of the straight top, one side of the first oblique pin is provided with a first protrusion, and the first protrusion is used to eject the product under the action of the ejection plate after the product is formed and to withdraw the first undercut of the product at the same time, and one end of the second oblique pin is fixed on the third hanging pin, and one side of the second oblique pin is provided with a second protrusion, and the second protrusion is used to eject the product under the action of the ejection plate after the product is formed and to withdraw the second undercut of the product at the same time;

[0011] Straight top, one end of the straight top is fixed on the second hanging pin, and the other end is arranged on one side of the first oblique pin. The straight top is provided with a concave block, and the concave block is used to eject the product under the action of the ejection plate after the product is formed and at the same time forcefully withdraw from the rib position of the product (the straight top cannot directly withdraw from the rib position of the product, so forced demolding is adopted).

[0012] Preferably, the power device may be a hydraulic cylinder disposed on the ejector rod of an injection molding machine or a mold.

[0013] Preferably, in the mold closing state, the values ​​of S1 (the shortest distance between the first oblique pin and the straight top) and S2 (the shortest distance between the second oblique pin and the straight top) are at least 1 to 2 mm larger than the exit stroke of the first oblique pin and the second oblique pin to prevent the first oblique pin, the second oblique pin and the straight top from colliding when exiting the product.

[0014] The beneficial effect of the present invention is that the present invention adopts an undercut ejection mechanism, adopts the first oblique pin and the straight ejector and the second oblique pin to move simultaneously, so that the first undercut and the second undercut of the product can be ejected while the product is ejected, and the rib position can be forced to be ejected, and it will not interfere with other structures, thereby realizing the production and molding of the undercut product in the mold.

Brief Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of a known product.

[0016] Figure 2 It is a structural schematic diagram of a known product from another angle.

[0017] Figure 3 It is a structural schematic diagram of an undercut withdrawal mechanism of the present invention.

[0018] Figure 4 It is a schematic diagram of the structure of the first oblique pin, the straight top and the second oblique pin in the present invention. [Specific implementation method]

[0019] To further illustrate the technical means and effects adopted by the present invention, the following is a detailed description in conjunction with the embodiments of the present invention and the accompanying drawings.

[0020] The present invention provides an undercut withdrawal mechanism, comprising:

[0021] A female mold 20, which cooperates with the male mold 30 to form a product 40;

[0022] The male mold 30 is provided with an ejection mechanism, including: an ejection plate 110, a hanging pin 120, an oblique pin 130 and a straight ejector 140; wherein,

[0023] The ejector plate 110 can move in the male mold 30 under the action of a power device (not shown in the figure), and can drive the hanging pins 120 fixed on the ejector plate 110 to move together under the action of the power device (not shown in the figure);

[0024] The hanging pin 120 includes a first hanging pin 121, a second hanging pin 122 and a third hanging pin 123, one end of each of the first hanging pin 121, the second hanging pin 122 and the third hanging pin 123 is respectively fixed to the ejection plate 110, and the other end of each of the first hanging pin 121, the second hanging pin 122 and the third hanging pin 123 is respectively fixed to the first oblique pin 131, the straight top 140 and the second oblique pin 132, so as to push the first oblique pin 131, the straight top 140 and the second oblique pin 132 to move under the action of the ejection plate 110;

[0025] The oblique pin 130 includes a first oblique pin 131 and a second oblique pin 132. One end of the first oblique pin 131 is fixed to the first hanging pin 121, and the other end is located at one end of the straight ejector 140. One side of the first oblique pin 131 is provided with a first protrusion 133. The first protrusion 133 is used to eject the product 40 and simultaneously withdraw the first undercut 50 of the product under the ejection action of the ejection plate 110 after the product 40 is formed. One end of the second oblique pin 132 is fixed to the third hanging pin 123, and one side of the second oblique pin 132 is provided with a second protrusion 134. The second protrusion 134 is used to eject the product 40 and simultaneously withdraw the second undercut 70 of the product under the ejection action of the ejection plate 110 after the product 40 is formed.

[0026] A straight ejector 140, one end of which is fixed on the second hanging pin 122, and the other end is arranged on one side of the first oblique pin 131. The straight ejector 140 is provided with a recessed block 141, and the recessed block 141 is used to eject the product 40 and forcefully withdraw from the rib position 60 of the product under the action of the ejection plate 110 after the product 40 is formed (the straight ejector 140 cannot directly withdraw from the rib position 60 of the product 40, so forced demolding is adopted).

[0027] The power device (not shown in the figure) may be a hydraulic cylinder arranged on a top rod of an injection molding machine or a mold.

[0028] Among them, Figure 4As shown in the mold closing state, the values ​​of S1 (the shortest distance between the first oblique pin 131 and the straight top 140) and S2 (the shortest distance between the second oblique pin 132 and the straight top 140) are at least 1 to 2 mm larger than the withdrawal stroke of the first oblique pin 131 and the second oblique pin 132, so as to prevent the first oblique pin 131 and the second oblique pin 132 from colliding with the straight top 140 when withdrawing from the product 40.

[0029] The working process of the present invention is as follows: after the product 40 is formed under the cooperation of the female mold 20 and the male mold 30, the ejector plate 110, under the action of a power device (not shown in the figure), causes the first hanging pin 121, the second hanging pin 122 and the third hanging pin 123 fixed on the ejector plate 110 to push the first oblique pin 131, the straight ejector 140 and the second oblique pin 132 to move respectively, so that the product 40 is ejected and the first undercut 50 and the second undercut 70 of the product are withdrawn at the same time, and the rib position 60 is forced to withdraw.

[0030] The beneficial effect of the present invention is that the present invention adopts an undercut ejection mechanism, adopts the first oblique pin 131 and the straight ejector 140 and the second oblique pin 132 to move simultaneously, so that the first undercut 50 and the second undercut 70 of the product can be ejected while the product 40 is ejected, and the rib position 60 can be forced to be ejected, and it will not interfere with other structures, thereby realizing the production and molding of the undercut product 40 in the mold.

[0031] It should be pointed out that the present invention is not limited to the above-mentioned implementation modes, and any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments by any technician familiar with the profession based on the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A reverse buckle withdrawal mechanism, characterized in that: include: A female mold, which cooperates with the male mold to form a product; The male mold is provided with an ejection mechanism, including: an ejection plate, a hanging pin, an inclined pin and a straight ejector; wherein, An ejector plate, which can move in the male mold under the action of a power device, and can drive the hanging pins fixed on the ejector plate to move together under the action of the power device; A hanging pin, wherein the hanging pin is provided with a first hanging pin, a second hanging pin and a third hanging pin, one end of the first hanging pin, the second hanging pin and the third hanging pin are respectively fixed to the ejection plate, and the other end thereof is respectively fixed with a first oblique pin, a straight ejector and a second oblique pin, for pushing the first oblique pin, the straight ejector and the second oblique pin to move under the action of the ejection plate; The oblique pin is provided with a first oblique pin and a second oblique pin, one end of the first oblique pin is fixed on the first hanging pin, and the other end is located at one end of the straight top, one side of the first oblique pin is provided with a first protrusion, and the first protrusion is used to eject the product under the action of the ejection plate after the product is formed and to withdraw the first undercut of the product at the same time, and one end of the second oblique pin is fixed on the third hanging pin, and one side of the second oblique pin is provided with a second protrusion, and the second protrusion is used to eject the product under the action of the ejection plate after the product is formed and to withdraw the second undercut of the product at the same time; A straight top, one end of which is fixed on the second hanging pin, and the other end is arranged on one side of the first oblique pin. The straight top is provided with a concave block, and the concave block is used to eject the product under the action of the ejection plate after the product is formed and forcefully withdraw from the rib position of the product.

2. The undercut withdrawal mechanism according to claim 1, characterized in that: The power device can be a hydraulic cylinder arranged on the ejector rod of the injection molding machine or the mold.

3. The undercut withdrawal mechanism according to claim 1, characterized in that: In the mold closing state, the values ​​of S1 (the shortest distance between the first oblique pin and the straight top) and S2 (the shortest distance between the second oblique pin and the straight top) are at least 1 to 2 mm larger than the exit stroke of the first oblique pin and the second oblique pin to prevent the first oblique pin, the second oblique pin and the straight top from colliding when exiting the product.

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