Reversed buckle withdrawing mechanism

Abstract

The invention provides an inverted buckle withdrawing mechanism which comprises a sliding seat arranged on a male mold plate, a limiting clamp arranged in the sliding seat, a driving device connected with the sliding seat, a first sliding block body connected with the driving end of the driving device, and a pull rod connected with the other end of the first sliding block body and capable of sliding in a second sliding block body; the second sliding block body is arranged in the sliding base in a sliding mode, a limiting clamping groove is formed in the bottom face of the second sliding block body and can be clamped with the limiting clamp to limit the second sliding block body, and a limiting plate is arranged on the second sliding block body. One end of the first insert is connected with the pull rod, and the first insert is provided with a first limiting boss, a second limiting boss and an inclined plane; the second insert is provided with an inclined surface matched with the first insert, can slide along the inclined surface of the first insert and is provided with an inverted buckle forming groove, the second insert is clamped and fixed with a positioning pin in the third insert, and the third insert is connected with the second sliding block body. And the product yield is improved.

Description

[Technical field]

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

[0002] Injection molded products usually have many undercuts due to their appearance or functional requirements. The undercuts of injection molded products can generally be formed by sliders. However, sometimes products with more complex structures also have undercuts in the direction of slider exit. In this way, a simple slider structure cannot meet the molding requirements of such undercuts, or cannot exit after molding the undercuts, and cannot meet product requirements.

[0003] In view of this, the present invention provides an undercut withdrawal mechanism to solve the above-mentioned problem. [Summary of the invention]

[0004] In order to solve the problem that when a product with a complex structure is formed by using an existing slider structure to form an undercut, if the product has an undercut in the exit direction of the slider structure, the undercut cannot be formed or the slider structure cannot be exited, 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: an undercut exit mechanism is arranged in an injection mold, and the undercut exit mechanism comprises:

[0006] A slide seat, wherein the slide seat is arranged on the male template, a bottom plate is arranged inside the slide seat, a limit clamp is arranged on the bottom plate, one end of the slide seat is connected to a driving device, a driving end of the driving device is passed through the slide seat and can move telescopically in the slide seat, and the driving end is connected to one end of the first slider body;

[0007] A first slider body, the other end of which is connected to one end of a pull rod up and down, and the driving end of the driving device can drive the first slider body and the pull rod to slide in the second slider body;

[0008] A second slider body, the second slider body is Z-shaped, the second slider body slides in the slide seat, and a limit slot is provided on the bottom surface of the second slider body that is in sliding contact with the slide seat bottom plate. When the mold is closed, the limit slot can be engaged with the limit clip to limit the second slider body. A limit plate is provided on the second slider body to limit the sliding stroke of the first slider body. Bosses are also provided on both sides of the second slider body close to the slide seat bottom plate. The bosses are pressed by a pressure block, and the bosses can slide between the pressure block and the slide seat bottom plate to enhance the stability of the second slider body when sliding. The pressure block is fixed on the slide seat;

[0009] A first insert, one end of which is connected to the other end of the pull rod, two ends of the first insert are respectively provided with a first limiting boss and a second limiting boss, and the first insert also has an inclined surface;

[0010] A second insert, wherein the second insert has an inclined surface matching the inclined surface of the first insert, and the second insert can slide along the inclined surface of the first insert. The second insert is provided with an undercut molding groove on the other side of the inclined surface of the second insert, which is used for undercutting the molding product in the exit direction of the undercut exit mechanism. The second insert is also provided with a clamping groove, which is used for clamping and fixing with a positioning pin, and the positioning pin is fixedly arranged inside the third insert. The first and second inserts can slide relative to the third insert inside the third insert;

[0011] The third insert is connected to the second slider body, the positioning pin is arranged through the interior of the third insert close to one end of the second slider body, and the positioning pin can respectively abut against the first limiting boss and the second limiting boss during the sliding process of the first insert, thereby limiting the sliding stroke of the first insert, and the first, second and third inserts and the male and female mold cores jointly form the product.

[0012] Preferably, the limiting clamp is a positioning bead limiting clamp.

[0013] Preferably, the driving device is a hydraulic cylinder.

[0014] Preferably, the second slider body includes a first part and a second part, wherein: the pull rod is slidably inserted into the first part, the second part is used to slide in the slide seat, the limiting slot is arranged on the bottom surface of the second part, and a slideway is also provided on the second part. The first slider body is driven by the driving device to slide in the slideway, and the limiting plate is arranged in the slideway. The limiting plate can stabilize the driving end when the driving end moves to prevent the driving end from shaking too much during the movement.

[0015] Preferably, a T-shaped slide groove is provided on the inclined surface of the first insert, and a T-shaped slide block is provided on the inclined surface of the second insert, and the first insert and the second insert are slidably connected via the T-shaped slide block and the T-shaped slide block.

[0016] The beneficial effect of the present invention is that it can form a product with a complex structure having undercuts in the direction of the undercut exit mechanism, thereby improving the product yield.

Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a product to be formed in an embodiment of the present invention.

[0018] Figure 2It is a schematic diagram of the product in the embodiment of the undercut withdrawal mechanism of the present invention.

[0019] Figure 3 It is a schematic diagram of the undercut withdrawal mechanism of the present invention.

[0020] Figure 4 It is a schematic diagram of the undercut ejection mechanism (the third insert is omitted) of the present invention in the mold closing state.

[0021] Figure 5 It is a schematic diagram of the undercut withdrawal mechanism (the third insert is omitted) of the present invention in the first stage of mold opening.

[0022] Figure 6 It is a schematic diagram of the undercut ejection mechanism of the present invention (the third insert and the second slider body are omitted) in the mold closing state.

[0023] Figure 7 It is a schematic diagram of the undercut ejection mechanism of the present invention (the third insert and the second slider body are omitted) in the mold closing state from another angle. [Specific implementation method]

[0024] 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.

[0025] The present invention provides an undercut ejection mechanism, which is arranged in an injection mold, and the undercut ejection mechanism comprises:

[0026] A slide 1, wherein the slide 1 is arranged on a male template (not shown in the figure), a bottom plate 10 is arranged inside the slide 1, a limit clamp 100 is arranged on the bottom plate 10, one end of the slide 1 is connected to a driving device 11, a driving end 110 of the driving device 11 is arranged in the slide 1, and can telescopically move in the slide 1, and the driving end 110 is connected to one end of the first slider body 2;

[0027] A first slider body 2, the other end of the first slider body 2 is connected to one end of the pull rod 20 up and down, and the driving end 110 of the driving device 11 can drive the first slider body 2 and the pull rod 20 to slide in the second slider body 3;

[0028] The second slider body 3 is in a Z-shape as a whole, and includes a first part 30 and a second part 31, wherein the second part 31 slides in the slide seat 1, and a limit groove (not shown) is provided on the bottom surface thereof in sliding contact with the slide seat bottom plate 10, and when the mold is closed, the limit groove (not shown) can be engaged with the limit clamp 100 to limit the second slider body 3, the pull rod 20 is slidably arranged in the first part 30, and a slideway 310 is also provided on the second part 31, and the first slider body 2 is driven by the driving device 11 to slide in the slideway 310, and the slideway A limiting plate 311 is provided on 310, which is used to limit the sliding stroke of the first slider body 2 and stabilize the driving end 110 when the driving end 110 moves, so as to prevent the driving end 110 from shaking too much during the movement. The second slider body 3 is also provided with bosses 312 on both sides close to the slide base plate 10. The bosses 312 are pressed by the pressing block 12. When the second slider body 3 slides, the bosses 312 slide between the pressing block 12 and the slide base plate 10. The two cooperate to improve the stability of the second slider body 3 when sliding. The pressing block 12 is fixed on the slide 1.

[0029] A first insert 4, one end of which is connected to the other end of the pull rod 20, and two ends of the first insert 4 are respectively provided with a first limiting boss 41 and a second limiting boss 42, and the first insert 4 also has an inclined surface, and a T-shaped slide groove 43 is provided on the inclined surface, and the first insert 4 is slidably connected with the T-shaped slide block 50 of the second insert 5 through its T-shaped slide groove 43;

[0030] A second insert 5, one side of the second insert 5 is provided with a T-shaped slider 50, which is an inclined surface matching the inclined surface of the first insert 4. The second insert 5 can slide along the inclined surface of the first insert 4 during the mold opening and closing process. The second insert 5 is provided with an undercut molding groove 51 on the other side of the inclined surface relative to the undercut molding groove, which is used for the undercut of the molded product in the exit direction of the undercut exit mechanism. The second insert 5 is also provided with a clamping groove 52, which is used to be clamped and fixed with a positioning pin 60. The positioning pin 60 is fixedly arranged inside the third insert 6. The first insert 4 and the second insert 5 can slide relative to the third insert 6 in the third insert 6;

[0031] The third insert 6 is connected to the first part 30 of the second slider body 3 and is used to participate in product molding. The positioning pin 60 is arranged through the interior of the third insert 6 close to one end of the second slider body 30. During the sliding process of the first insert 4, the positioning pin 60 can be respectively abutted against its first limiting boss 41 and the second limiting boss 42, thereby limiting the sliding stroke of the first insert 4. The first insert 4, the second insert 5, the third insert 6 and the male and female mold cores (not shown) jointly mold the product.

[0032] The limiting clamp 100 is a positioning bead limiting clamp. When the driving device 11 continuously drives its driving end 110 , the limiting slot (not shown) of the second slider body 3 can be disengaged from the limiting clamp 100 .

[0033] Wherein, the driving device 11 is a hydraulic cylinder.

[0034] The working process of the present invention is described below in conjunction with an embodiment of the present invention: In this embodiment, the product 7 formed by the undercut exit mechanism is as follows: Figure 1 As shown, the product 7 has a first undercut 70 and a second undercut 71. The first undercut 70 is formed by one end of the first insert 4, the second insert 5, and the third insert 6. The second undercut 71 is formed by the undercut molding groove 51 on the second insert 5 in the exit direction of the first insert 4, the second insert 5, and the third insert 6. When the mold is closed and injection molding begins, the undercut exit mechanism is as shown in FIG. Figure 3 In the state shown, the first insert 4 and the second insert 5 are both covered in the third insert 6, and the limiting groove (not shown) of the second slider body 3 is engaged with the limiting clip 100 on the slide base plate 10;

[0035] The first stage of mold opening after injection molding: Figure 5 The schematic diagram of the state of the undercut withdrawal mechanism (the third insert is omitted) in the first stage of mold opening is depicted. At this time, the driving device 11 drives the driving end 110 to drive the first slider body 2, the pull rod 20 and the first insert 4 to withdraw in the direction away from the product 7. Since the second slider body 3 is limited by the limiting clamp 100 on the slide base plate 10 at this time, the second slider body 3 and the third insert 6 fixed on the second slider body 3 remain stationary. At the same time, the second insert 5 fixed by the positioning pin 60 in the third insert 6 cannot retreat in the direction away from the product 7. The second insert 5 will move along the inclined surface of the first insert 4 in the upward direction relative to the second undercut 71, thereby withdrawing from the second undercut 71;

[0036] The second stage of mold opening: when the first slider body 2 retreats to the position of the limit plate 311 on the second slider body 3, the driving device 11 continues to drive the driving end 110 to move in the direction of retreating from the product 7, and the first slider body 2 connected to the driving end 110 will be stuck at the limit plate 311 and drive the second slider body 3 to move so as to disengage from the limit of the limit clamp 100. At the same time, the second slider body 3 drives the third insert 6 and the second insert 5 to retreat from the first undercut 70 of the product, completing the withdrawal of the product undercut.

[0037] The beneficial effect of the present invention is that it can form a product with a complex structure having undercuts in the direction of the undercut exit mechanism, thereby improving the product yield.

[0038] 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. An undercut ejection mechanism, arranged in an injection mold, characterized in that: include: A slide seat, wherein the slide seat is arranged on the male template, a bottom plate is arranged inside the slide seat, a limit clamp is arranged on the bottom plate, one end of the slide seat is connected to a driving device, a driving end of the driving device is passed through the slide seat and can move telescopically in the slide seat, and the driving end is connected to one end of the first slider body; A first slider body, the other end of which is connected to one end of a pull rod, and the driving end can drive the first slider body and the pull rod to slide in the second slider body; A second slider body, the second slider body is Z-shaped, and a limit slot is provided on its bottom surface that is in sliding contact with the slide base plate. When the mold is closed, the limit slot and the limit clip are engaged to limit the second slider body. A limit plate is provided on the second slider body to limit the sliding stroke of the first slider body. Bosses are also provided on both sides of the second slider body close to the slide base plate. The bosses are pressed by a pressing block, and the pressing block is fixed on the slide base; A first insert, one end of which is connected to the other end of the pull rod, two ends of the first insert are respectively provided with a first limiting boss and a second limiting boss, and the first insert also has an inclined surface; A second insert, wherein the second insert has an inclined surface matching the inclined surface of the first insert, the second insert can slide along the inclined surface of the first insert, the second insert is provided with an undercut molding groove on the other side of the inclined surface, the second insert is also provided with a clamping groove, the clamping groove is used to be clamped and fixed with a positioning pin, the positioning pin is arranged inside the third insert, and the first and second inserts can slide relative to the third insert inside the third insert; The third insert is connected to the second slider body, the positioning pin is arranged through the interior of the third insert close to one end of the second slider body, and the positioning pin can respectively abut against the first limiting boss and the second limiting boss during the sliding process of the first insert, thereby limiting the sliding stroke of the first insert, and the first, second and third inserts and the male and female mold cores jointly form the product.

2. The undercut withdrawal mechanism according to claim 1, characterized in that: The limiting clamp is a positioning bead limiting clamp.

3. The undercut withdrawal mechanism according to claim 1, characterized in that: The driving device is a hydraulic cylinder.

4. The undercut withdrawal mechanism according to claim 1, characterized in that: The second slider body includes a first part and a second part, wherein: the pull rod is slidably inserted into the first part, the second part is used to slide in the slide seat, the limiting slot is arranged on the bottom surface of the second part, and a slideway is also arranged on the second part. The first slider body is driven by the driving device to slide in the slideway, and the limiting plate is arranged in the slideway.

5. The undercut withdrawal mechanism according to claim 1, characterized in that: A T-shaped slide groove is arranged on the inclined surface of the first insert, and a T-shaped slide block is arranged on the inclined surface of the second insert. The first insert and the second insert are slidably connected via the T-shaped slide block and the T-shaped slide block.

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