Mold and method for forming injection product with inclined inverted buckle

Abstract

The invention relates to the technical field of injection molding, and discloses a mold and method for molding an injection product with an inclined inverted buckle, the mold comprises a base, the upper surface of the base is fixedly connected with a sliding column, the upper surface of the base is fixedly connected with a first hydraulic cylinder, and the output end of the first hydraulic cylinder is provided with a mold assembly; a sliding column is fixedly connected to the upper surface of the base, the sliding column is connected with a mold assembly, a mounting block is fixedly connected to the upper surface of the base, a second hydraulic cylinder is fixedly connected to the upper surface of the base, a limiting assembly is arranged at the output end of the second hydraulic cylinder, and the limiting assembly is connected with a first ejection block. The first hydraulic cylinder is started to drive the lower mold to slide, meanwhile, the upper mold is fixed, then the lower mold is separated from the upper mold, the second hydraulic cylinder is started to drive the limiting block to slide along the inner wall of the mounting block, and therefore the injection molding assembly can be rapidly separated from the interior of the mold assembly; and adhesion of the first ejector block and the injection molding assembly is avoided, so that the complete effect of the injection molding assembly is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to a mold and a method for molding an injection molded product with an oblique undercut. Background Art

[0002] Injection molding is a processing method that injects molten plastic raw materials into a closed mold cavity and obtains plastic products with specific shapes and sizes after cooling and solidification. The basic process is: the plastic raw materials are heated and melted in the barrel of the injection molding machine, and with the help of the thrust of the screw or plunger, they are injected into the pre-designed mold cavity through the nozzle. After the plastic cools and hardens into shape, the mold is opened and the product is removed, and then subsequent processing is carried out. This process has the characteristics of high production efficiency, high product precision, and the ability to form parts with complex shapes. It is widely used in many fields such as automobiles, electronics, medical devices, and daily necessities, among which the mold is an important part of injection molding.

[0003] Related molds usually use forced ejection or slider core pulling mechanisms to demold injection molded products with oblique undercuts. However, the oblique undercut part forms a negative angle with the mold cavity. The ejector block is prone to adhesion to the inner wall of the product during the ejection process, resulting in surface scratches or structural fractures on the product. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a mold and a method for molding injection molded products with oblique undercuts, which solves the problem of surface scratches or structural fractures on the product caused by the fact that related molds usually use forced ejection or slider core pulling mechanisms to demold injection molded products with oblique undercuts.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a mold for molding injection molded products with oblique undercuts and a method thereof, comprising a base, the upper surface of the base is fixedly connected to a sliding column, the upper surface of the base is fixedly connected to a hydraulic cylinder 1, the output end of the hydraulic cylinder 1 is provided with a mold assembly, the sliding column is connected to the mold assembly, the upper surface of the base is fixedly connected to a mounting block, the upper surface of the base is fixedly connected to a hydraulic cylinder 2, the output end of the hydraulic cylinder 2 is provided with a limiting assembly, the limiting assembly is connected to a top block 1, the limiting assembly is connected to the mounting block, a demolding assembly is provided inside the top block 1, the side wall of the top block 1 is provided on the side wall of the mounting block, the upper surface of the top block 1 is provided with an injection molding assembly, the injection molding assembly is connected to the mold assembly, and the limiting assembly is connected to the top block 2.

[0006] By adopting the above technical solution, hydraulic cylinder 1 is started to drive the lower side of the mold assembly to slide along the outer wall of the sliding column, while fixing the upper side, causing the mold assembly to separate up and down and expose the internal model cavity, and then hydraulic cylinder 2 is started to push the limit assembly to move, and the convex structure at the bottom of the top block is close to the edge of the mounting block. The groove in the limit assembly limits its displacement range, so that the top block 1 slides and moves upward along the inner groove of the injection molding assembly in cooperation with the mounting block and the limit assembly, so that the injection molding assembly can be quickly detached from the inside of the mold assembly, and the top block 1 is prevented from sticking to the injection molding assembly to ensure the integrity of the injection molding assembly.

[0007] Preferably, the mold assembly includes a lower mold, the lower surface of which is connected to the output end of hydraulic cylinder 1, the inner wall of the lower mold is slidably connected to the outer wall of the sliding column, the upper surface of the lower mold is provided with an upper mold, and the inner wall of the lower mold is provided on the outer wall of the mounting block.

[0008] Preferably, the limiting assembly includes a limiting block, the lower surface of which is connected to the output end of hydraulic cylinder 2, a limiting groove is provided inside the limiting block, and the side wall of top block 1 is fixedly connected to slider 1.

[0009] Preferably, the outer portion of the slider 1 is slidably connected to the inner portion of the limiting groove, the outer portion of the slider 1 is slidably connected to the inner portion of the limiting block, and the upper surface of the limiting block is slidably connected to the side wall of the top block 1.

[0010] Preferably, the injection molding component includes a product body, the side walls of the product body are arranged on the upper surface of the top block, an inclined groove is opened inside the product body, the outside of the product body is arranged inside the lower mold, and the outside of the product body is arranged inside the upper mold.

[0011] Preferably, the demoulding assembly includes a reset spring, one end of which is arranged inside the top block 1, and the other end of the reset spring is provided with a demoulding module, and the side wall of the top block 1 is fixedly connected with a positioning block.

[0012] Preferably, the outside of the stripping module is slidably connected to the outside of the positioning block, the side wall of the stripping module is arranged inside the inclined groove, and the outside of the stripping module is arranged on the side wall of the product body.

[0013] Preferably, the side wall of the limit block is slidably connected to a second slider, and the upper surface of the limit block is slidably connected to a second top block.

[0014] Preferably, the outer wall of the second slider is fixedly connected to the side wall of the second top block, and the outer wall of the second slider is slidably connected to the inside of the limiting groove.

[0015] Preferably, a method for using a mold for molding an injection molded product with an oblique undercut comprises the following steps:

[0016] By starting hydraulic cylinder 2, the limit block is driven to slide along the inner wall of the mounting block, and then the top block 1 moves synchronously under the drive of the limit block. Since the lower side of the top block 1 is convex and close to the edge of the mounting block, and a limit groove is provided inside the limit block, the top block 1 slides along the direction of the limit groove under the drive of the slider 1 and moves upward at the same time, and the top block 2 also slides along the opposite side groove of the injection molding component under the joint action of the mounting block and the limit assembly. Then the injection molding component moves upward inside the mold cavity under the drive of the top block 1 and the top block 2, and then the demoulding component pops out from the inside of the top block 1 and presses against the outside of the product body.

[0017] Working principle: By starting hydraulic cylinder 1 to drive the lower mold to slide, the upper mold is fixed at the same time, and then the lower mold is separated from the upper mold. At this time, hydraulic cylinder 2 is started to drive the limit block to slide along the inner wall of the mounting block, and then the top block 1 moves synchronously under the drive of the limit block. At this time, the top block 1 slides and moves upward at the same time under the drive of the slider 1, and the top block 2 also slides under the joint action of the mounting block and the limit assembly, and then the injection molding assembly moves upward inside the model cavity, and then the demoulding assembly pops out from the inside of the top block 1 and presses against the outside of the product body to assist the displacement of the top block 1, so that the injection molding assembly can be quickly separated from the inside of the mold assembly, and the top block 1 is prevented from sticking to the injection molding assembly to ensure the integrity of the injection molding assembly.

[0018] The first top block pushes against the inner side of the product body to push the product body upward, and the first top block moves left and right under the drive of the limit assembly, and then the first top block slides with the inner side of the injection molding assembly. At this time, the return spring stretches and drives the stripping module to slide out. At this time, the first top block and the second top block slide relative to the product body, and the return spring slides relative to the inclined groove. Then, the residual rubber material inside the product body and the inclined groove is removed by friction, thereby auxiliary cleaning of the residual rubber material inside the product body and the inclined groove, and preventing the residual rubber material from affecting the subsequent processing of the product body.

[0019] The upper block 2 is driven to move upward by the limit block, and the slider 2 slides at the same time driven by the limit block. At this time, the upper block 2 slides left and right driven by the slider 2, and there are two groups of limit components on the upper side of the base that move in opposite directions. When the limit block moves up to a certain height, the two groups of upper blocks 2 fit together and the upper block 2 is locked and no longer moves, and then the limit component stops moving up, thereby achieving the effect of limiting the mold opening height of the product body and preventing the upper block 1 and the upper block 2 from moving up excessively and detaching from the inside of the mounting block.

[0020] The invention provides a mold and a method for molding an injection molded product with an oblique undercut.

[0021] It has the following beneficial effects:

[0022] 1. The present invention starts hydraulic cylinder 1 to drive the lower mold to slide, while fixing the upper mold, and then separates the lower mold from the upper mold. At this time, hydraulic cylinder 2 is started to drive the limit block to slide along the inner wall of the mounting block, and then the top block 1 moves synchronously under the drive of the limit block, so that the injection molding component can be quickly separated from the interior of the mold assembly, and the top block 1 is prevented from adhering to the injection molding component to ensure the integrity of the injection molding component.

[0023] 2. The present invention pushes the product body upward by pressing the top block against the inner side of the product body, and the top block moves left and right under the drive of the limit assembly, and then the top block slides dislocated with the inner side of the injection molding assembly, thereby helping to clean the residual rubber inside the product body and the inclined groove, and preventing the residual rubber from affecting the subsequent processing of the product body.

[0024] 3. The present invention drives the top block 2 to move upward through the limit block, and at the same time, the slider 2 slides under the drive of the limit block. At this time, the top block 2 slides left and right under the drive of the slider 2, and there are two groups of limit components on the upper side of the base that move in opposite directions, thereby achieving the effect of limiting the mold opening height of the product body and preventing the top block 1 and the top block 2 from moving upward excessively and detaching from the inside of the mounting block. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of a mold for molding an injection molded product with an oblique undercut proposed by the present invention;

[0026] Figure 2 This is a partial structural diagram of a hydraulic cylinder of a mold for molding an injection molded product with an oblique undercut proposed by the present invention;

[0027] Figure 3 This is a schematic cross-sectional view of the internal structure of the mounting block of a mold for molding an injection molded product with an oblique undercut proposed by the present invention;

[0028] Figure 4 This is a schematic diagram of the partial structure of the demoulding assembly of the mold for molding an injection molded product with an oblique undercut proposed by the present invention;

[0029] Figure 5 This is a schematic diagram of the partial structure of the limiting groove of the mold for molding an injection molded product with an oblique undercut proposed by the present invention;

[0030] Figure 6 This is a schematic diagram of the partial structure of the return spring of the mold for molding injection molded products with oblique undercuts proposed by the present invention.

[0031] Among them, 1. Base; 2. Sliding column; 3. Hydraulic cylinder 1; 4. Mold assembly; 41. Lower mold; 42. Upper mold; 5. Injection molding assembly; 51. Product body; 52. Oblique groove; 6. Mounting block; 7. Hydraulic cylinder 2; 8. Limit assembly; 81. Limit block; 82. Limit groove; 83. Slider 1; 9. Top block 1; 10. Top block 2; 11. Demolding assembly; 111. Return spring; 112. Demolding module; 113. Positioning block; 12. Slider 2. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Please see the attached Figure 1 -Attached Figure 3 , an embodiment of the present invention provides a mold for molding an injection molded product with an oblique undercut and a method thereof, comprising a base 1, a sliding column 2 is fixedly connected to the upper surface of the base 1, a hydraulic cylinder 3 is fixedly connected to the upper surface of the base 1, a mold assembly 4 is provided at the output end of the hydraulic cylinder 3, the sliding column 2 is connected to the mold assembly 4, a mounting block 6 is fixedly connected to the upper surface of the base 1, a hydraulic cylinder 2 is fixedly connected to the upper surface of the base 1, a limiting assembly 8 is provided at the output end of the hydraulic cylinder 2 7, the limiting assembly 8 is connected to a top block 1 9, the limiting assembly 8 is connected to the mounting block 6, a demolding assembly 11 is provided inside the top block 1 9, the side wall of the top block 1 9 is provided on the side wall of the mounting block 6, an injection molding assembly 5 is provided on the upper surface of the top block 1 9, the injection molding assembly 5 is connected to the mold assembly 4, and the limiting assembly 8 is connected to the top block 2 10.

[0034] Specifically, when the injection molding is completed, the hydraulic cylinder 1 3 is first started to drive the lower part of the mold assembly 4 to slide along the outer wall of the sliding column 2, and at the same time the upper part of the mold assembly 4 is fixed, and then the upper and lower parts of the mold assembly 4 are separated, wherein the interior of the mold assembly 4 constitutes the injection molding mold cavity, and at this time the hydraulic cylinder 2 7 is started to drive the limit assembly 8 to move along the inner wall of the mounting block 6. Since the lower part of the top block 1 9 is convex and close to the inner edge of the mounting block 6, and the interior of the limit assembly 8 is provided with a groove for limiting the displacement range of the top block 1 9, this makes the top block 1 9 under the joint action of the mounting block 6 and the limit assembly 8. It slides along the inner groove of the injection molding component 5 and moves upward at the same time, and the top block 2 10 also slides along the opposite side groove of the injection molding component 5 under the joint action of the mounting block 6 and the limiting component 8, and then the injection molding component 5 moves upward inside the mold cavity under the drive of the top block 1 9 and the top block 2 10, and then the demolding component 11 pops out from the inside of the top block 1 9 and presses on the outside of the product body 51 to assist the displacement of the top block 1 9, so that the injection molding component 5 can be quickly separated from the inside of the mold assembly 4, and the top block 1 9 and the injection molding component 5 are prevented from adhering to ensure the integrity of the injection molding component 5, thereby ensuring that the product meets the quality standards.

[0035] See attached Figure 1 -Attached Figure 2 The mold assembly 4 includes a lower mold 41, the lower surface of the lower mold 41 is connected to the output end of the hydraulic cylinder 3, the inner wall of the lower mold 41 is slidably connected to the outer wall of the sliding column 2, and the upper surface of the lower mold 41 is provided with an upper mold 42, and the inner wall of the lower mold 41 is provided on the outer wall of the mounting block 6.

[0036] Specifically, by starting the hydraulic cylinder 3 to drive the lower mold 41 to slide along the sliding column 2, the upper mold 42 is fixed at the same time, and then the lower mold 41 is separated from the upper mold 42 to assist in the subsequent separation of the injection molding component 5, wherein the interior of the lower mold 41 and the upper mold 42 form a model cavity to perform injection molding on the injection molding component 5.

[0037] See attached Figure 4 -Attached Figure 5 The limiting assembly 8 includes a limiting block 81, the lower surface of which is connected to the output end of the hydraulic cylinder 2 7, a limiting groove 82 is provided inside the limiting block 81, and a slider 83 is fixedly connected to the side wall of the top block 9.

[0038] Specifically, the limit block 81 is driven by the hydraulic cylinder 2 7 to slide along the inner wall of the mounting block 6, and then the top block 9 moves synchronously under the drive of the limit block 81. Since the lower side of the top block 9 is convex and close to the edge of the mounting block 6, and a limit groove 82 is provided inside the limit block 81, the top block 9 slides along the direction of the limit groove 82 under the drive of the slider 1 83.

[0039] See attached Figure 4 -Attached Figure 5 The outside of the slider 83 is slidably connected to the inside of the limiting groove 82, the outside of the slider 83 is slidably connected to the inside of the limiting block 81, and the upper surface of the limiting block 81 is slidably connected to the side wall of the top block 9.

[0040] Specifically, the slider 1 83 cooperates with the limiting groove 82 to limit the moving direction of the top block 1 9 , and the limiting block 81 is used to drive the top block 1 9 to move upward.

[0041] See attached Figure 2 The injection molding component 5 includes a product body 51, the side walls of the product body 51 are arranged on the upper surface of the top block 9, an inclined groove 52 is opened inside the product body 51, the outside of the product body 51 is arranged inside the lower mold 41, and the outside of the product body 51 is arranged inside the upper mold 42.

[0042] Specifically, the mold shapes the injection molded product through the cavity formed inside the lower mold 41 and the upper mold 42. When the injection molding is completed, the product body 51 adheres to the inside of the lower mold 41 and the upper mold 42, and the oblique groove 52 is the oblique buckle formed after the product body 51 is injected.

[0043] See attached Figure 5 -Attached Figure 6 The demoulding assembly 11 includes a return spring 111, one end of the return spring 111 is arranged inside the top block 9, and the other end of the return spring 111 is provided with a demoulding module 112, and the side wall of the top block 9 is fixedly connected with a positioning block 113; the outside of the demoulding module 112 is slidably connected to the outside of the positioning block 113, the side wall of the demoulding module 112 is arranged inside the inclined groove 52, and the outside of the demoulding module 112 is arranged on the side wall of the product body 51.

[0044] Specifically, when the top block 9 slides out along the mounting block 6 and presses against the inner side of the product body 51 to push it upward, the top block 9 moves left and right under the drive of the limit assembly 8 when moving upward, and then the top block 9 will be relatively displaced with the injection molding assembly 5. At this time, the return spring 111 is stretched and drives the stripping module 112 to slide along the positioning block 113, wherein the positioning block 113 is used to limit the sliding direction of the stripping module 112 to avoid the stripping modules 112 colliding with each other due to falling due to their own weight. At this time, the top block 19 and the top block 2 10 slide relative to the product body 51, and the return spring 111 slides relative to the oblique groove 52. Subsequently, the residual rubber material inside the product body 51 and the oblique groove 52 is removed by friction, thereby achieving the effect of auxiliary cleaning of the inside of the product body 51 and the dead corners, and avoiding the residual rubber material affecting the subsequent processing.

[0045] See attached Figure 5The side wall of the limit block 81 is slidably connected to the slider 2 12, and the upper surface of the limit block 81 is slidably connected to the top block 2 10; the outer wall of the slider 2 12 is fixedly connected to the side wall of the top block 2 10, and the outer wall of the slider 2 12 is slidably connected to the inside of the limit groove 82.

[0046] Specifically, the top block 2 10 is driven to move upward by the limit block 81, and the slider 2 12 slides along the limit groove 82. The lower side of the top block 2 10 is convex and close to the inner side of the mounting block 6. Therefore, the top block 2 10 slides along the direction of the limit groove 82 driven by the slider 2 12, and two groups of mounting blocks 6 are symmetrically installed on the upper side of the base 1, that is, there are two groups of limit assemblies 8 moving in opposite directions. When the limit assembly 8 moves up to a certain height, the two groups of top blocks 2 10 fit together and restrict the top block 2 10 from moving up, and then the limit assembly 8 stops moving up, thereby achieving the effect of accurately controlling the mold opening height of the product body 51 and avoiding the top block 1 9 and the top block 2 10 from moving up excessively and detaching from the inside of the mounting block 6.

[0047] See attached Figure 1 -Attached Figure 6 A method for using a mold for molding an injection molded product with an oblique undercut comprises the following steps:

[0048] By starting the hydraulic cylinder 2 7 to drive the limit block 81 to slide along the inner wall of the mounting block 6, the top block 1 9 then moves synchronously driven by the limit block 81. Since the lower side of the top block 1 9 is convex and close to the edge of the mounting block 6, and a limit groove 82 is provided inside the limit block 81, the top block 1 9 slides along the limit groove 82 driven by the slider 1 83 and moves upward at the same time. The top block 2 10 also slides along the opposite side groove of the injection molding component 5 under the joint action of the mounting block 6 and the limit assembly 8. Then the injection molding component 5 moves upward inside the mold cavity driven by the top block 1 9 and the top block 2 10, and then the demolding component 11 pops out from the inside of the top block 1 9 and presses against the outside of the product body 51.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mold for molding an injection molded product with an oblique undercut, characterized in that: The invention comprises a base (1), wherein the upper surface of the base (1) is fixedly connected with a sliding column (2), the upper surface of the base (1) is fixedly connected with a hydraulic cylinder (3), the output end of the hydraulic cylinder (3) is provided with a mold assembly (4), the sliding column (2) is connected to the mold assembly (4), the upper surface of the base (1) is fixedly connected with a mounting block (6), the upper surface of the base (1) is fixedly connected with a hydraulic cylinder (7), the output end of the hydraulic cylinder (7) is provided with a limiting assembly (8), the limiting assembly (8) is connected with a top block (9), the limiting assembly (8) is connected with the mounting block (6), a demoulding assembly (11) is provided inside the top block (9), the side wall of the top block (9) is provided on the side wall of the mounting block (6), an injection molding assembly (5) is provided on the upper surface of the top block (9), the injection molding assembly (5) is connected to the mold assembly (4), and the limiting assembly (8) is connected with the top block (10).

2. The mold for molding an injection molded product with an oblique undercut according to claim 1, characterized in that: The mold assembly (4) includes a lower mold (41), the lower surface of the lower mold (41) is connected to the output end of the hydraulic cylinder (3), the inner wall of the lower mold (41) is slidably connected to the outer wall of the sliding column (2), the upper surface of the lower mold (41) is provided with an upper mold (42), and the inner wall of the lower mold (41) is provided on the outer wall of the mounting block (6).

3. The mold for molding an injection molded product with an oblique undercut according to claim 1, characterized in that: The limiting assembly (8) includes a limiting block (81), the lower surface of which is connected to the output end of the second hydraulic cylinder (7), a limiting groove (82) is provided inside the limiting block (81), and a sliding block (83) is fixedly connected to the side wall of the first top block (9).

4. The mold for molding an injection molded product with an oblique undercut according to claim 3, characterized in that: The outer portion of the slider (83) is slidably connected to the inner portion of the limiting groove (82), the outer portion of the slider (83) is slidably connected to the inner portion of the limiting block (81), and the upper surface of the limiting block (81) is slidably connected to the side wall of the top block (9).

5. The mold for molding an injection molded product with an oblique undercut according to claim 1, characterized in that: The injection molding component (5) includes a product body (51), the side wall of the product body (51) is arranged on the upper surface of the top block (9), the interior of the product body (51) is provided with an inclined groove (52), the exterior of the product body (51) is arranged inside the lower mold (41), and the exterior of the product body (51) is arranged inside the upper mold (42).

6. The mold for molding an injection molded product with an oblique undercut according to claim 1, characterized in that: The demoulding assembly (11) includes a reset spring (111), one end of which is arranged inside the top block (9), and the other end of the reset spring (111) is provided with a demoulding module (112), and the side wall of the top block (9) is fixedly connected with a positioning block (113).

7. The mold for molding an injection molded product with an oblique undercut according to claim 6, characterized in that: The outside of the stripping module (112) is slidably connected to the outside of the positioning block (113), the side wall of the stripping module (112) is arranged inside the inclined groove (52), and the outside of the stripping module (112) is arranged on the side wall of the product body (51).

8. The mold for molding an injection molded product with an oblique undercut according to claim 3, characterized in that: The side wall of the limit block (81) is slidably connected to the second slider (12), and the upper surface of the limit block (81) is slidably connected to the side wall of the second top block (10).

9. The mold for molding an injection molded product with an oblique undercut according to claim 8, characterized in that: The outer wall of the second slider (12) is fixedly connected to the side wall of the second top block (10), and the outer wall of the second slider (12) is slidably connected to the inside of the limiting groove (82).

10. A method for using a mold for molding an injection molded product with an oblique undercut, characterized in that: The mold for molding an injection molded product with an oblique undercut as claimed in any one of claims 1 to 9 comprises the following steps: By starting the hydraulic cylinder 2 (7), the limit block (81) is driven to slide along the inner wall of the mounting block (6), and then the top block 1 (9) moves synchronously under the drive of the limit block (81). Since the lower side of the top block 1 (9) is convex and close to the edge of the mounting block (6), and a limit groove (82) is provided inside the limit block (81), the top block 1 (9) slides along the limit groove (82) under the drive of the slider 1 (83) and moves upward at the same time. Moreover, the top block 2 (10) also slides along the opposite side groove of the injection molding component (5) under the joint action of the mounting block (6) and the limit assembly (8). Then, the injection molding component (5) moves upward inside the mold cavity under the drive of the top block 1 (9) and the top block 2 (10), and then the demoulding component (11) pops out from the inside of the top block 1 (9) and presses against the outside of the product body (51).

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