Secondary ejection mechanism

Abstract

The present invention discloses a secondary ejection mechanism, which relates to the technical field of injection molds. In the secondary ejection mechanism of the present invention, when the driving mechanism drives the ejection seat to move upward and the elastic ejection assembly reaches the primary ejection limit position, the elastic ejection assembly and the fixed ejector pin realize the primary ejection of the product in the male mold. At the same time, the shovel base and the self-resetting locking assembly are separated, and the self-resetting locking assembly self-resets to release the lock on the elastic ejection assembly so that the elastic ejection assembly can move elastically relative to the ejection seat; when the driving mechanism continues to drive the ejection seat to move upward, the fixed ejector pin realizes the secondary ejection of the product. The secondary ejection mechanism of the present invention not only has a simple structure and saves space, expands the scope of application, but also works stably and reliably, and improves the production yield of the product.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a secondary ejection mechanism. Background Art

[0002] In the injection mold manufacturing industry, the ejector mechanism is an indispensable part of the mold, primarily used to help the finished product escape from the mold. Currently, when producing plastic products, deep-cavity and deep-rib products in injection molds generally use a secondary ejector mechanism.

[0003] Existing secondary ejection mechanisms mainly include hook-type secondary ejection mechanisms, resin shutter-type secondary ejection mechanisms, and spring-type secondary ejection mechanisms. Although the above secondary ejection mechanisms can all realize product ejection, the hook-type secondary ejection mechanisms and the resin shutter-type secondary ejection mechanisms have implementation limitations due to their complex structures. The spring-type secondary ejection mechanism is unreliable due to the unstable spring force. It often causes abnormal situations such as product bulging, deformation, and failure to eject synchronously with the product, which seriously affects the production yield of the product. Summary of the Invention

[0004] In view of the above defects in the prior art, the present invention provides a new secondary ejection mechanism, which not only has a simple structure and saves space, but also has a wider range of applications, and works stably and reliably, thereby improving the production yield of the product.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The secondary ejection mechanism comprises a lower fixed plate, a male mold fixedly arranged on the lower fixed plate, and an ejection seat slidably arranged between the lower fixed plate and the male mold through a guide structure, and also comprises: a fixed ejector pin and an elastic ejector assembly arranged on the ejection seat and passing through the male mold, a self-resetting locking assembly arranged in the ejection seat and used to lock the elastic ejector assembly, and a shovel base arranged on the lower fixed plate and matched with the self-resetting locking assembly; when the driving mechanism drives the ejection seat to move upward and the elastic ejector assembly reaches the primary ejection limit position, the elastic ejector assembly and the fixed ejector pin realize a primary ejection of the product in the male mold, and at the same time, the shovel base and the self-resetting locking assembly are separated, and the self-resetting locking assembly self-resets to release the lock of the elastic ejector assembly so that the elastic ejector assembly can elastically move relative to the ejection seat; when the driving mechanism continues to drive the ejection seat to move upward, the fixed ejector pin realizes a secondary ejection of the product.

[0007] In which, the elastic ejection assembly includes a pull rod, a first spring, a limit block cooperating with the self-resetting locking assembly, and a ejection block for ejecting the product; a first mounting cavity is provided in the public mold, and the ejection block is slidably provided in the first mounting cavity; a second mounting cavity is provided in the ejection seat, and the head of the pull rod is located in the second mounting cavity, the rod portion of the pull rod passes through the ejection seat and passes into the public mold and is connected with the ejection block in the first mounting cavity; the limit block and the first spring are provided in the second mounting cavity, and the limit block is located between the first spring and the head of the pull rod.

[0008] Wherein, a limiting groove is provided on the inner wall of the first mounting cavity, the ejector block comprises a ejector block body and a limiting protrusion protruding from the ejector block body, the limiting protrusion is slidably arranged in the limiting groove, and the groove wall of the limiting groove serves as the one-time ejection limit position.

[0009] Wherein, a guide column is provided on the limit block, and the first spring is sleeved on the guide column.

[0010] In which, the self-resetting locking assembly includes a locking block and a second spring, a third mounting cavity connected to the second mounting cavity is provided in the ejection seat, the locking block is slidably arranged in the third mounting cavity, the second spring is located between the locking block and the cavity wall of the third mounting cavity, the sliding direction of the locking block is perpendicular to the sliding direction of the limit block, and when the locking block slides to the bottom of the limit block, the limit block is locked.

[0011] Wherein, a mounting blind hole is provided on the locking block, one end of the second spring is installed in the mounting blind hole, and the other end is pressed against the cavity wall of the third mounting cavity.

[0012] Wherein, the locking block is provided with a slot for the shovel base to be inserted into, and when the shovel base is inserted into the slot, the locking block is located below the limiting block.

[0013] The ejector seat includes an upper ejector plate and a lower ejector plate that are detachably connected, and the second installation cavity and the third installation cavity are jointly surrounded by the upper ejector plate and the lower ejector plate.

[0014] Wherein, the male mold includes a male mold plate and a male mold core, and the first installation cavity is surrounded by the male mold plate and the male mold core.

[0015] Wherein, a secondary ejection limiting structure is provided on the ejection seat, and the secondary ejection limiting structure is located between the ejection seat and the male mold, and is used to cooperate with the male mold to slide and limit the ejection seat.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are:

[0017] The secondary ejection mechanism provided by the present invention can realize secondary ejection of the product only by means of an elastic ejection component, a fixed ejector pin, a self-resetting locking component and a shovel base. Compared with the secondary ejection mechanism in the form of a hook and the secondary ejection mechanism in the form of a resin shutter in the prior art, the structure is greatly simplified. Its structure is simpler and space-saving, thereby breaking the limitation of use and expanding the scope of application. At the same time, the secondary ejection mechanism in the present invention locks the elastic ejection component by means of the self-resetting locking component and the shovel base, so that the elastic ejection component can eject the product stably and reliably. Compared with the secondary ejection mechanism in the form of a spring in the prior art, the secondary ejection mechanism avoids abnormal situations such as deformation of the product and failure to eject synchronously with the product, thereby improving the production yield of the product.

[0018] In summary, the secondary ejection mechanism of the present invention not only has a simple structure and saves space, thus expanding the scope of application, but also works stably and reliably, thereby improving the production yield of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the state of the secondary ejection mechanism of the present invention when the product is not ejected;

[0020] Figure 2 This is a schematic diagram of the primary ejection state of the secondary ejection mechanism of the present invention;

[0021] Figure 3 Schematic diagram of the secondary ejection state of the secondary ejection mechanism of the present invention;

[0022] Figure 4 yes Figure 1 A schematic diagram of the structure on the other side of a portion of the structure in the middle elastic ejector assembly;

[0023] Figure 5 It is a structural schematic diagram of the elastic ejection component, the self-resetting locking component and the shovel base in the secondary ejection mechanism of the present invention;

[0024] Figure: 1, lower fixing plate; 2, male mold; 21, male mold plate; 22, male mold core; 23, first mounting cavity; 231, limiting groove; 232, groove wall; 3, ejector seat; 31, upper ejector plate; 32, lower ejector plate; 33, second mounting cavity; 34, third mounting cavity; 35, limiting column; 4, fixed ejector pin; 5, elastic ejector assembly; 51, pull rod; 511, T-shaped connection; 512, stop Surface; 52. First spring; 53. Limit block; 54. Top block; 541. Top block body; 542. Limit protrusion; 543. T-slot; 55. Guide column; 6. Self-resetting locking assembly; 61. Locking block; 611. Locking block body; 612. Locking part; 613. Mounting blind hole; 614. Slot; 62. Second spring; 7. Shovel base; 8. Drive mechanism; 9. Product; 10. Stop pin. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] like Figures 1 to 5 As shown in the figure, the secondary ejection mechanism includes a lower fixed plate 1, a male mold 2 fixedly set on the lower fixed plate 1, and an ejection seat 3 slidably set between the lower fixed plate 1 and the male mold 2 through a guide structure (not shown in the figure), and also includes: a fixed ejector 4 and an elastic ejection component 5 set on the ejection seat 3 and passing through the male mold 2, a self-resetting locking component 6 set in the ejection seat 3 and used to lock the elastic ejection component 5, and a shovel base 7 set on the lower fixed plate 1 by a bolt and cooperating with the self-resetting locking component 6; when the drive When the mechanism 8 drives the ejection seat 3 to move upward and the elastic ejection component 5 reaches the primary ejection limit position, the elastic ejection component 5 and the fixed ejector 4 realize the primary ejection of the product 9 in the male mold 2. At the same time, the shovel base 7 and the self-resetting locking component 6 are separated, and the self-resetting locking component 6 self-resets to release the lock of the elastic ejection component 5 so that the elastic ejection component 5 can move elastically relative to the ejection seat 3; when the driving mechanism 8 continues to drive the ejection seat 3 to move upward, the fixed ejector 4 realizes the secondary ejection of the product 9 to completely eject the product 9.

[0027] The elastic ejection assembly 5 in this embodiment includes a pull rod 51, a first spring 52, a limit block 53 cooperating with the self-resetting locking assembly 6, and a ejection block 54 for ejecting the product 9; a first mounting cavity 23 is provided in the male mold 2, and the ejection block 54 is slidably provided in the first mounting cavity 23; a second mounting cavity 33 is provided in the ejection seat 3, and the head of the pull rod 51 is located in the second mounting cavity 33, and the rod portion of the pull rod 51 passes through the ejection seat 3 and penetrates into the male mold 2 and is connected with the ejection block 54 in the first mounting cavity 23; the limit block 53 and the first spring 52 are provided in the second mounting cavity 33, and the limit block 53 is located between the first spring 52 and the head of the pull rod 51.

[0028] In this embodiment, a limiting groove 231 is provided on the inner wall of the first mounting cavity 23, and the ejector block 54 includes a ejector block body 541 and a limiting protrusion 542 protruding from the ejector block body 541. The limiting protrusion 542 is slidably provided in the limiting groove 231, and the groove wall 232 of the limiting groove 231 is a one-time ejection limit position.

[0029] In order to ensure that the first spring 52 is extended and retracted in a preset direction, in this embodiment, a guide post 55 is provided on the limit block 53 , and the first spring 52 is sleeved on the guide post 55 .

[0030] Specifically, a countersunk hole adapted to the guide column 55 is provided on the limit block 53, the head of the guide column 55 is located in the countersunk hole, the rod of the guide column 55 passes through the limit block 53 and the ejection seat 3, the first spring 52 is sleeved on the rod of the guide column 55, and one end of the first spring 52 abuts against the step in the second mounting cavity 33, and the other end abuts against the limit block 53.

[0031] In this embodiment, the upper end of the ejector block body 541 is used to contact the product 9, and the lower end of the ejector block body 541 is provided with a T-slot 543. The rod part of the pull rod 51 is provided with a T-shaped connecting part 511 that is compatible with the T-slot 543. The T-shaped connecting part 511 passes through the ejector seat 3 and passes into the male mold 2 and is connected to the T-slot 543.

[0032] To facilitate connection, in this embodiment, both ends of the T-shaped connection portion 511 are configured to be arc-shaped. When connecting, the T-shaped connection portion 511 is first inserted into the T-shaped slot 543 and then rotated to achieve connection.

[0033] To prevent the pull rod 51 from rotating during use, in this embodiment, a stop surface 512 is provided on the head of the pull rod 51 and the part of the rod near the head, and a stop pin 10 that cooperates with the stop surface 512 is provided in the second mounting cavity 33.

[0034] The self-resetting locking assembly 6 in this embodiment includes a locking block 61 and a second spring 62. A third mounting cavity 34 connected to the second mounting cavity 33 is provided in the ejection seat 3. The locking block 61 is slidably set in the third mounting cavity 34. The second spring 62 is located between the locking block 61 and the cavity wall of the third mounting cavity 34. The sliding direction of the locking block 61 is perpendicular to the sliding direction of the limit block 53. When the locking block 61 slides to the bottom of the limit block 53, the limit block 53 is locked.

[0035] Specifically, the locking block 61 includes a locking block body 611 and a locking portion 612 protruding from one end of the locking block body 611 . The locking portion 612 is used to lock the limiting block 53 .

[0036] In this embodiment, a mounting blind hole 613 is provided on the locking portion 612 of the locking block 61 . One end of the second spring 62 is mounted in the mounting blind hole 613 , and the other end rests against the cavity wall of the third mounting cavity 34 .

[0037] In order to achieve cooperation with the shovel base 7, this embodiment provides a slot 614 for inserting the shovel base 7 on the locking block body 611 of the locking block 61. When the shovel base 7 is inserted into the slot 614, the locking portion 612 of the locking block 61 is located below the limit block 53 to lock the limit block 53.

[0038] The male mold 2 in this embodiment includes a male mold plate 21 and a male mold core 22 , and the first installation cavity 23 is surrounded by the male mold plate 21 and the male mold core 22 .

[0039] The ejector seat 3 in this embodiment includes an upper ejector plate 31 and a lower ejector plate 32 that are detachably connected. The second installation cavity 33 and the third installation cavity 34 are jointly enclosed by the upper ejector plate 31 and the lower ejector plate 32. At the same time, the upper ejector plate 31 and the lower ejector plate 32 also jointly enclose a fourth installation cavity (not shown in the figure). The head of the fixed ejector pin 4 is located in the fourth installation cavity, and the rod of the fixed ejector pin 4 is inserted through the upper ejector plate 31, the male mold plate 21 and the male mold core 22.

[0040] To prevent excessive ejection, a secondary ejection limiting structure is provided on the upper ejection plate 31 of the ejection seat 3 in this embodiment. The secondary ejection limiting structure is located between the upper ejection plate 31 and the male mold 2 and is used to cooperate with the male mold plate 21 of the male mold 2 to slide and limit the ejection seat 3.

[0041] Specifically, the secondary ejection limiting structure is a limiting column 35 . Of course, other limiting structures such as a limiting block may also be used, and this embodiment does not limit this.

[0042] The driving mechanism 8 in this embodiment is an ejection mechanism of an injection molding machine. The ejection mechanism of an injection molding machine is a prior art and will not be described in detail here. Specifically, it can be a hydraulic cylinder.

[0043] When in use, the driving mechanism 8 drives the ejection seat 3 to move upward until the limiting protrusion 542 of the ejection block 54 abuts against the groove wall 232, the ejection block 54 and the fixed ejector 4 extend out of the male mold core 22 to realize the primary ejection of the product 9 in the male mold core 22. At the same time, the shovel base 7 and the locking block body 611 of the locking block 61 are separated, and the locking block 61 is self-reset under the drive of the second spring 62. The locking portion 612 of the locking block 61 moves to the side of the limiting block 53 to release the lock of the entire elastic ejection assembly 5 so that the elastic ejection assembly 5 can move elastically up and down relative to the ejection seat 3; when the driving mechanism 8 continues to drive the ejection seat 3 to move upward, the elastic ejection assembly 5 does not move, and only the fixed ejector 4 realizes the secondary ejection of the product 9 to completely eject the product 9.

[0044] The secondary ejection mechanism provided by the present invention can realize the secondary ejection of the product only through the elastic ejection component 5, the fixed ejector 4, the self-resetting locking component 6 and the shovel base 7. Compared with the secondary ejection mechanism in the form of a hook and the secondary ejection mechanism in the form of a resin shutter in the prior art, the structure is greatly simplified. Its structure is simpler and space-saving, thereby breaking the limitations and expanding the scope of application; at the same time, the secondary ejection mechanism in the present invention locks the elastic ejection component 5 through the self-resetting locking component 6 and the shovel base 7, so that the elastic ejection component 5 can stably and reliably eject the product 9. Compared with the secondary ejection mechanism in the form of a spring in the prior art, it avoids the occurrence of abnormal situations such as deformation of the product 9 and failure to eject synchronously with the product 9, thereby improving the production yield of the product 9.

[0045] In summary, the secondary ejection mechanism of the present invention not only has a simple structure and saves space, thus expanding the scope of application, but also works stably and reliably, thereby improving the production yield of the product.

[0046] The present invention is not limited to the above-mentioned specific implementation methods. Various changes made by ordinary technicians in this field based on the above-mentioned concept without creative work fall within the scope of protection of the present invention.

Claims

1. A secondary ejection mechanism comprising a lower fixed plate, a male mold fixedly disposed on the lower fixed plate, and an ejection seat slidably disposed between the lower fixed plate and the male mold via a guide structure, characterized in that: Also includes: A fixed ejector pin and an elastic ejector assembly disposed on the ejector seat and passing through the male mold, a self-resetting locking assembly disposed in the ejector seat and used to lock the elastic ejector assembly, and a shovel base disposed on the lower fixed plate and cooperating with the self-resetting locking assembly; When the driving mechanism drives the ejection seat to move upward and the elastic ejection assembly reaches the primary ejection limit position, the elastic ejection assembly and the fixed ejector realize the primary ejection of the product in the male mold. At the same time, the shovel base and the self-resetting locking assembly are separated, and the self-resetting locking assembly self-resets and releases the lock of the elastic ejection assembly so that the elastic ejection assembly can move elastically relative to the ejection seat. When the driving mechanism continues to drive the ejection seat to move upward, the fixed ejector realizes the secondary ejection of the product. The elastic ejection assembly includes a pull rod, a first spring, a limit block cooperating with the self-resetting locking assembly, and a ejection block for ejecting the product; A first mounting cavity is provided in the male mold, and the top block is slidably provided in the first mounting cavity; A second mounting cavity is provided in the ejector seat, the head of the pull rod is located in the second mounting cavity, the rod portion of the pull rod passes through the ejector seat and enters the male mold to connect with the ejector block in the first mounting cavity; the limit block and the first spring are provided in the second mounting cavity, and the limit block is located between the first spring and the head of the pull rod; The self-resetting locking assembly includes a locking block and a second spring. A third mounting cavity connected to the second mounting cavity is provided in the ejection seat. The locking block is slidably arranged in the third mounting cavity. The second spring is located between the locking block and the cavity wall of the third mounting cavity. The sliding direction of the locking block is perpendicular to the sliding direction of the limit block. When the locking block slides to the bottom of the limit block, the limit block is locked.

2. The secondary ejection mechanism according to claim 1, characterized in that: A limiting groove is provided on the inner wall of the first mounting cavity, and the ejector block comprises a ejector block body and a limiting protrusion protruding from the ejector block body. The limiting protrusion is slidably disposed in the limiting groove, and the groove wall of the limiting groove serves as the one-time ejection limit position.

3. The secondary ejection mechanism according to claim 1, characterized in that: A guide column is provided on the limiting block, and the first spring is sleeved on the guide column.

4. The secondary ejection mechanism according to claim 1, characterized in that: The locking block is provided with a mounting blind hole, one end of the second spring is mounted in the mounting blind hole, and the other end rests against the cavity wall of the third mounting cavity.

5. The secondary ejection mechanism according to claim 1, characterized in that: The locking block is provided with a slot for the shovel base to be inserted into. When the shovel base is inserted into the slot, the locking block is located below the limiting block.

6. The secondary ejection mechanism according to claim 1, characterized in that: The ejector seat includes an upper ejector plate and a lower ejector plate that are detachably connected, and the second installation cavity and the third installation cavity are jointly surrounded by the upper ejector plate and the lower ejector plate.

7. The secondary ejection mechanism according to claim 1, characterized in that: The male mold includes a male mold plate and a male mold core, and the first installation cavity is surrounded by the male mold plate and the male mold core.

8. The secondary ejection mechanism according to any one of claims 1 to 7, characterized in that: The ejection seat is provided with a secondary ejection limiting structure, which is located between the ejection seat and the male mold and is used to cooperate with the male mold to slide and limit the ejection seat.

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