Die structure capable of quickly replacing ejector sleeve insert pin

Abstract

The utility model relates to the technical field of injection molds, in particular to a mold structure capable of quickly replacing an ejector sleeve insert pin, which comprises a mold plate and a mold core, the mold core is detachably mounted on the mold plate, a cavity is arranged on the surface of the mold core, and an insert hole communicated with the cavity is arranged on the mold core. A first insert and a second insert are detachably installed in the insert hole, an ejector sleeve insert pin is installed at the end, close to the surface of the cavity, of the first insert, the lower half portion, close to the face of the second insert, of the first insert protrudes to form a first protruding part, and the upper half portion, close to the face of the first insert, of the second insert protrudes to form a second protruding part. The second protruding part is pressed above the first protruding part. The spare ejector sleeve insert pin can be directly and rapidly replaced on a machine table, the cost of spare parts is reduced, meanwhile, the replacement efficiency is improved, and the influence on the production schedule is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field more specifically, relate to a kind of mold structure of quick replacement of plunger barrel insert pin. BACKGROUND

[0002] In the injection mold technical field, the insert pin is provided in the general injection mold, so that the injection product in the mold forms an observation hole at the insert pin after cooling and solidification. However, since the insert pin is suspended in the cavity for a long time during injection molding, it is easy to break under external impact in the suspended state due to its generally slender shape. The existing mold has difficulty in replacing the insert pin, and the replacement operation after the insert pin breaks will seriously affect production. By not using the insert pin to make the observation hole, drilling operation is needed on the product surface after the product is injection molded. This production method will generate additional processes, consume a lot of manpower and resources, and has low production efficiency. Moreover, the overall integrity of the injection molded product is damaged during drilling, and cracks are easily generated near the observation hole during drilling, affecting product quality. SUMMARY

[0003] To solve the technical problems of difficult replacement and low efficiency of the insert pin in the prior art, the utility model provides a mold structure for quick replacement of plunger barrel insert pin, which can quickly replace the standby plunger barrel insert pin directly on the machine table, reducing the cost of spare parts, improving the replacement efficiency, and reducing the impact on production progress.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of a mold structure for quick replacement of plunger barrel insert pin, which includes a mold plate and a mold core. The mold core is detachably installed on the mold plate. The mold core has a cavity on its surface. The mold core has an insert hole that communicates with the cavity. The insert hole detachably installs a first insert and a second insert. The first insert has a plunger barrel insert pin installed on one end near the surface of the cavity. The first insert has a first protruding part protruding from the lower half of one side near the second insert. The second insert has a second protruding part protruding from the upper half of one side near the first insert. The second protruding part is pressed above the first protruding part. The first protruding part has a first installation structure on its upper surface. The first installation structure is detachably connected with the mold plate.

[0005] In the technical solution, the template is fixedly installed on a machine table for injection molding operation, a mold pin is detachably installed on the template, a cavity is arranged on the mold pin, the external shape of the injection molded product is determined by the cavity, the external shapes of different injection molded products are different, and different cavities are required. The worker can directly change the mold pin to adapt to different injection molded products. The cavity is provided with an insert hole, a first insert and a second insert are detachably installed in the insert hole, and a plunger pin is installed on the first insert. When the plunger pin needs to be replaced, the first insert only needs to be detached. The simplest method for detaching the first insert is to directly detach the first insert through the cavity, which requires that a first mounting structure for mounting the first insert be arranged on the side of the first insert facing the cavity. At the same time, when injection molding is performed, the product will also be in contact with the upper surface of the first insert, and the upper surface of the first insert participates in forming the external surface of the product. However, the presence of the first mounting structure causes defects on the external surface of the product. Therefore, the lower end of the first insert is provided with a first protruding portion, the first mounting structure is arranged on the first protruding portion, the upper end of the second insert is provided with a second protruding portion, the upper end of the second protruding portion is flush with the surface of the cavity, and the second protruding portion is pressed above the first protruding portion. Such an arrangement allows the external surface of the product to be in contact with the upper surface of the second protruding portion during injection molding, without being in contact with the first protruding portion located below the second protruding portion, thereby isolating the first mounting structure located on the first protruding portion from the product, and avoiding the influence of the first mounting structure on the external surface of the product. At the same time, the second insert also has an auxiliary fixing effect on the first insert, the second protruding portion on the second insert is pressed above the first protruding portion to limit the upward movement of the first protruding portion, and thus the upward movement of the first insert is limited. When the plunger pin is replaced, the worker only needs to detach the second insert from the direction of the cavity, and then detach the first insert from the insert hole through the first mounting structure located on the first protruding portion, to realize the replacement of the plunger pin located on the first insert. In this process, the template and the mold pin are installed on the machine table for injection molding operation and do not need to be detached, greatly simplifying the replacement process of the plunger pin and improving the replacement efficiency of the plunger pin. At the same time, the plunger pin is only fixed on the first insert, and when different specifications of plunger pins are required, only the first insert needs to be replaced, thereby enhancing the universality of the structure and reducing the spare part cost for different specifications of plunger pins.

[0006] Preferably, the first insert is located on the inner side of the cavity, the second insert is located on the outer side of the cavity, the top of the second insert is higher than the top surface of the second protruding portion to form a stepped surface, the stepped surface is the end surface of the product, the first protruding portion is provided with a first mounting structure, the top surface of the second insert is provided with a second mounting structure, and the first mounting structure and the second mounting structure are detachably connected with the template.

[0007] Preferably, the first mounting structure is a first threaded hole penetrating through the first protruding part, the template is provided with a second threaded hole, the first threaded hole is aligned with the second threaded hole, and the template further comprises a first fastening bolt, which is threadedly connected with the first threaded hole and the second threaded hole.

[0008] Preferably, the second mounting structure is a third threaded hole penetrating through the second insert, the template is provided with a fourth threaded hole, the third threaded hole is aligned with the fourth threaded hole, and the template further comprises a second fastening bolt, which is threadedly connected with the third threaded hole and the fourth threaded hole.

[0009] Preferably, one of the side wall surfaces of the insert hole is a reference surface, which is a vertically arranged plane.

[0010] Preferably, the side wall surfaces of the insert hole, except the reference surface, are inclined surfaces, the cross-sectional area of the insert hole decreases from top to bottom, and the shapes of the first insert and the second insert are matched with the shape of the insert hole.

[0011] Preferably, the first insert is provided with a mounting hole, and the drill insert pin is detachably mounted in the mounting hole.

[0012] Preferably, the mounting hole penetrates through the top end and the bottom end of the first insert, the bottom end of the mounting hole is provided with a counterbore structure, the bottom end of the drill insert pin is provided with an abutting portion, and the abutting portion abuts against the counterbore structure.

[0013] Preferably, the height of the counterbore structure is higher than the height of the abutting portion, and the bottom end of the counterbore structure is further provided with a pad, the top end of the pad abuts against the bottom end of the abutting portion.

[0014] Preferably, the bottom surface of the template is provided with a fifth threaded hole penetrating through the template, the bottom surface of the insert core is provided with a sixth threaded hole, the fifth threaded hole is aligned with the sixth threaded hole, and the template further comprises a third bolt, which is threadedly connected with the fifth threaded hole and the sixth threaded hole.

[0015] Compared with the prior art, the mould structure for quickly replacing the barrel insert has the beneficial effects that: the insert hole is arranged in the cavity, the first insert with the barrel insert is detachably installed in the insert hole, when the barrel insert needs to be replaced, the first insert can be directly detached from the cavity by the worker, the template and the mould core do not need to be detached from the machine table, the replacement efficiency of the barrel insert is improved, and the replacement process is simplified. The second protruding part is arranged to separate the product from the first mounting structure for fixing the first insert, so that the appearance of the first mounting structure is prevented from affecting the appearance of the outer surface of the product. When different specifications of the barrel insert are needed, only the first insert needs to be replaced, the universality of the structure is enhanced, and the spare part cost for different specifications of the barrel insert is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the mould structure for quickly replacing the barrel insert of the utility model;

[0017] Figure 2 is a perspective view of the mould core in the mould structure for quickly replacing the barrel insert of the utility model;

[0018] Figure 3 is Figure 1 is an enlarged view of A in

[0019] In the drawings: 1, template; 2, mould core; 3, cavity; 4, first insert; 5, second insert; 6, barrel insert; 7, pad; 8, product; 11, second threaded hole; 12, fourth threaded hole; 13, fifth threaded hole; 14, third bolt; 21, sixth threaded hole; 31, insert hole; 32, reference surface; 41, first protruding part; 42, first threaded hole; 43, first fastening bolt; 44, counterbore structure; 45, mounting hole; 51, second protruding part; 52, stepped surface; 53, third threaded hole; 54, second fastening bolt; 61, abutting part. DETAILED DESCRIPTION

[0020] The drawings are only used for exemplary illustration, and should not be understood as a limitation to the patent; in order to better illustrate the embodiment, some components in the drawings can be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it can be understood that some well-known structures in the drawings and their descriptions can be omitted. The positional relationship described in the drawings is only used for exemplary illustration, and should not be understood as a limitation to the patent.

[0021] The same or similar reference signs in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "long", "short" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation and be operated, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0022] The technical scheme of the present application will be further specifically described below by means of specific embodiments and in combination with the drawings:

[0023] Embodiment 1

[0024] As Figure 1 , 2The mould structure for quickly replacing the plunger pin insert includes a mould plate 1 and a mould core 2, the mould core 2 is detachably installed on the mould plate 1, a cavity 3 is arranged on the surface of the mould core 2, a insert hole 31 is arranged on the mould core 2 and is communicated with the cavity 3, a first insert 4 and a second insert 5 are detachably installed in the insert hole 31, a plunger pin insert 6 is installed on the end of the first insert 4 close to the surface of the cavity 3, a first protruding part 41 is protruded on the lower half of the surface of the first insert 4 close to the second insert 5, a second protruding part 51 is protruded on the upper half of the surface of the second insert 5 close to the first insert 4, the second protruding part 51 is pressed on the upper side of the first protruding part 41, a first installation structure is arranged on the upper surface of the first protruding part 41, and the first installation structure is detachably connected with the mould plate 1. The mould plate 1 is fixedly installed on a machine table for injection molding operation, the mould core 2 is detachably installed on the mould plate 1, the cavity 3 is arranged on the mould core 2, the external shape of an injection product 8 is determined by the cavity 3, the external shapes of different injection products 8 are different, and different cavities 3 are needed. Workers can directly change the cavity 3 by replacing the mould core 2 to adapt to different injection products 8. The cavity 3 is provided with the insert hole 31, the first insert 4 and the second insert 5 are detachably installed in the insert hole 31, the plunger pin insert 6 is installed on the first insert 4, and when the plunger pin insert 6 needs to be replaced, the first insert 4 only needs to be detached. When the first insert 4 is detached, the simplest method is to directly detach the first insert 4 through the cavity 3, which requires that the first installation structure for installing the first insert 4 needs to be arranged on the surface of the first insert 4 facing the cavity 3. At the same time, when the injection product 8 is produced, the product 8 also contacts the upper surface of the first insert 4, and the upper surface of the first insert 4 participates in forming the external surface of the product 8. However, the existence of the first installation structure causes defects on the external surface of the product 8. Therefore, the lower end of the first insert 4 is provided with the first protruding part 41, the first installation structure is arranged on the first protruding part 41, the upper end of the second protruding part 51 of the second insert 5 is flush with the surface of the cavity 3, and the second protruding part 51 is pressed on the upper side of the first protruding part 41. Such arrangement makes the external surface of the product 8 contact the upper surface of the second protruding part 51 during injection, and does not contact the first protruding part 41 below the second protruding part 51, so as to isolate the first installation structure on the first protruding part 41 from the product 8, and avoid the influence of the first installation structure on the external surface of the product 8. At the same time, the second insert 5 also has an auxiliary fixing effect on the first insert 4, the second protruding part 51 on the second insert 5 is pressed on the upper side of the first protruding part 41, which limits the upward movement of the first protruding part 41, and further limits the upward movement of the first insert 4. When the plunger pin insert 6 is replaced, workers only need to detach the second insert 5 from the direction of the cavity 3, and then detach the first insert 4 from the insert hole 31 through the first installation structure on the first protruding part, so as to replace the plunger pin insert 6 on the first insert 4.In this process, the template 1 and the core 2 are installed on the machine for injection molding operation without disassembly, greatly simplifying the replacement process of the plunger pin 6, improving the replacement efficiency of the plunger pin 6. At the same time, the plunger pin 6 is only fixed on the first insert 4, and when different specifications of the plunger pin 6 are needed, only the first insert 4 needs to be replaced, which enhances the universality of the structure and reduces the cost of spare parts for different specifications of the plunger pin 6.

[0025] As shown in Figure 2 , the first insert 4 is located inside the cavity 3, and the second insert 5 is located outside the cavity 3. The top of the second insert 5 is higher than the top surface of the second protruding part 51 to form a stepped surface 52, and the stepped surface 52 is the end surface of the product 8. The second installation structure is provided on the top surface of the second insert 5 and is detachably connected with the template 1. The first insert 4 and the second insert 5 are installed in the insert hole 31. Since the plunger pin 6 on the first insert 4 needs to form an observation hole on the surface of the product 8, the first insert 4 needs to be arranged inside the cavity 3 to ensure that the plunger pin 6 on the first insert 4 participates in the structure of the product 8. The stepped surface 52 is formed between the second insert 5 and the second protruding part 51, and the stepped surface 52 can determine the external boundary of the product 8 and the position of the product 8. The top surface of the second protruding part 51 on the side inside the stepped surface 52 participates in the external shape of the product 8, and the top surface of the second insert 5 on the side outside the stepped surface 52 does not participate. The second installation structure is provided on the second insert 5 for fixing the second insert 5. The second installation structure is arranged on the top surface of the second insert 5, so that the staff can directly operate the second installation structure on the top surface of the second insert 5 through the cavity 3 to realize the installation and disassembly of the second insert 5. Since the top surface of the second insert 5 where the second installation structure is located does not participate in the external shape of the product 8, it is ensured that the second installation structure will not affect the product 8.

[0026] As shown in Figure 2 , the first installation structure is a first threaded hole 42, and the first threaded hole 42 penetrates the first protruding part 41. The template 1 is provided with a second threaded hole 11, and the second threaded hole 11 is aligned with the first threaded hole 42. The first fastening bolt 43 is threadedly connected with the first threaded hole 42 and the second threaded hole 11. When not blocked by the second insert 5, the first fastening bolt 43 can be directly inserted into the first threaded hole 43 and the second threaded hole 11 from the cavity 3 in sequence, so as to fix the relative position of the first threaded hole 43 and the second threaded hole 11, and finally fix the relative position of the first insert 4 and the template 1. The first fastening bolt 43 is threadedly connected with the first threaded hole 43 and the second threaded hole 11, which ensures that the first fastening bolt 43 is connected stably and is not easy to be separated along the holes of the first threaded hole 43 and the second threaded hole 11.

[0027] AsFigure 2 As shown, the second mounting structure includes a third threaded hole 53 that penetrates the second insert 5. A fourth threaded hole 12 is provided on the template 1, with the third threaded hole 53 and the fourth threaded hole 12 aligned. It also includes a second fastening bolt 54, which is threadedly connected to both the third threaded hole 53 and the fourth threaded hole 12. The second fastening bolt 54 can be directly inserted from the cavity into the third threaded hole 53 and the fourth threaded hole 12 sequentially, thereby determining their relative positions and ultimately fixing the second insert 5 to the template 1. The second fastening bolt 54 is threaded to both the third threaded hole 53 and the fourth threaded hole 12, ensuring a stable connection and preventing it from easily disengaging along the direction of the holes.

[0028] Example 2

[0029] This embodiment is similar to Embodiment 1 above, except that, as Figure 1 , 3 As shown, one of the sidewall surfaces of the insert hole 31 is a reference surface 32, which is a vertically set plane. The reference surface 32 is set according to a standard position. The first insert 4 and the second insert 5 abut against each other. The relative positions of the first insert 4 and the second insert 5 are determined. Therefore, only a single reference surface 32 needs to be set, and the reference surface 32 abuts against the first insert 4 or the second insert 5 to determine the position of the first insert 4 and the second insert 5.

[0030] like Figure 3 As shown, the sidewalls of the insert hole 31, except for the reference surface 32, are all inclined surfaces. The cross-sectional area of ​​the insert hole 31 decreases from top to bottom. The shapes of the first insert 4 and the second insert 5 match the shape of the insert hole 31. By setting all surfaces of the insert hole 31, except for the reference surface 31, as inclined surfaces, the insert hole 31 forms a quasi-inverted cone structure, which facilitates the quick installation and removal of the first insert 4 and the second insert 5.

[0031] Example 3

[0032] This embodiment is similar to Embodiment 1 above, except that, as Figure 2 As shown, the first insert 4 is provided with a mounting hole 45, and the ejector pin 6 can be detachably installed in the mounting hole 45. The mounting hole 45 serves to determine the position of the ejector pin 6. When the ejector pin 6 malfunctions, it can be directly removed from the mounting hole 45 on the first insert 43 for replacement.

[0033] like Figure 2As shown, the mounting hole 45 penetrates the top and bottom of the first insert 4, and the bottom of the mounting hole 45 is provided with a counterbore structure 44. The bottom of the plunger insert 6 is provided with an abutting portion 61, and the abutting portion 61 abuts against the counterbore structure 44. The abutting portion 61 at the bottom of the plunger insert 6 has the function of fixing the position of the plunger insert 6. When installing the plunger insert 6, the plunger insert 6 needs to be inserted from the bottom into the mounting hole 45 of the first insert 4. The bottom of the mounting hole 45 is provided with a counterbore structure 44. By abutting the abutting portion 61 on the plunger insert 6 against the counterbore structure 44 at the bottom of the mounting hole 45, the movement of the plunger insert 6 along the axis of the mounting hole 45 can be limited, thereby avoiding the plunger insert 6 from being pulled out of the upper end of the mounting hole 45 when the product 8 moves the plunger insert 6 during the removal of the product 8.

[0034] As shown in Figure 2 , the height of the counterbore structure 44 is higher than the height of the abutting portion 61, and the bottom of the counterbore structure 44 is further provided with a pad 7, and the top of the pad 7 abuts against the bottom of the abutting portion 61. The pad 7 has the function of protecting the plunger insert 6 from being damaged by directly abutting against other structures. The bottom of the plunger insert 6 is supported by the pad 7. When different heights of pads 7 are used, the height of the plunger insert 6 is also different, and the height of the upper end of the plunger insert 6 protruding from the mounting hole 45 is also different, thereby leaving observation holes of different depths on the surface of the product 8.

[0035] As shown in Figure 2 , the bottom surface of the mold plate 1 is provided with a fifth threaded hole 13, and the fifth threaded hole 13 penetrates the mold plate 1. The bottom surface of the mold core 2 is provided with a sixth threaded hole 21, and the fifth threaded hole 13 is aligned with the sixth threaded hole 21. Further comprising a third bolt 14, the third bolt 14 is threadedly connected with the fifth threaded hole 13 and the sixth threaded hole 21. The third fastening bolt 14 is inserted into the fifth threaded hole 13 and the sixth threaded hole 21 at the same time, thereby fixing the relative position of the fifth threaded hole 13 and the sixth threaded hole 21, and finally achieving the fixation of the position between the mold plate 1 and the mold core 2. When installing the mold core 2 and the mold plate 1, the mold core 2 is placed above the mold plate 1, so that the upper surface of the fifth threaded hole 13 is blocked by the mold core 2, and it is difficult to install the third fastening bolt 14 from the upper surface of the fifth threaded hole 13. Therefore, the fifth threaded hole 13 needs to be provided to penetrate the mold plate 1, and when installing the third fastening bolt 14, the fifth threaded hole 13 and the sixth threaded hole 21 can be inserted from the lower end of the mold plate 1 in sequence, thereby ensuring sufficient installation space. The third fastening bolt 14, the fifth threaded hole 13 and the sixth threaded hole 21 are all threadedly connected, which is stable and convenient to disassemble and assemble. When it is necessary to disassemble or replace the mold core 2, only the third fastening bolt 14 needs to be loosened, so that the third fastening bolt 14 is separated from the sixth threaded hole 21 on the mold core 2, and then the mold core 2 can be disassembled from the mold plate 1.

[0036] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A mold structure for quick change of a pin in a cylinder, characterized by, The utility model provides a mould structure, including template (1) and mould core (2), mould core (2) can be detachably installed on template (1), the surface of mould core (2) is provided with cavity (3), mould core (2) is provided with insert hole (31) with cavity (3) is connected, first insert (4) and second insert (5) can be detachably installed in insert hole (31), first insert (4) is installed with the needle of the cylinder insert (6) in the end close to the surface of cavity (3), the lower half of the one side close to second insert (5) of first insert (4) is protruded and forms first protruding portion (41), the upper half of the one side close to first insert (4) of second insert (5) is protruded and forms second protruding portion (51), second protruding portion (51) is pressed on the top of first protruding portion (41), and the upper surface of first protruding portion (41) is provided with first mounting structure, and first mounting structure is detachably connected with template (1).

2. The mold structure of claim 1, wherein, First insert (4) is located in the inside of cavity (3), and second insert is located in the outside of cavity (3), and the top of second insert (5) is higher than the top surface of second protruding portion (51) and forms step surface (52), the step surface (52) is the end surface of product, and the top surface of second insert (5) is provided with second mounting structure, and second mounting structure is detachably connected with template (1).

3. The mold structure of claim 1, wherein, First mounting structure is first threaded hole (42), first threaded hole (42) penetrates first protruding portion (41), and template (1) is provided with second threaded hole (11), second threaded hole (11) is aligned with first threaded hole (42), and first fastening bolt (43) is further included, and first fastening bolt (43) is threadedly connected with first threaded hole (42) and second threaded hole (11).

4. The mold structure of claim 2, wherein, Second mounting structure is third threaded hole (53), third threaded hole (53) penetrates second insert (5), and template (1) is provided with fourth threaded hole (12), third threaded hole (53) is aligned with fourth threaded hole (12), and second fastening bolt (54) is further included, and second fastening bolt (54) is threadedly connected with third threaded hole (53) and fourth threaded hole (12).

5. The mold structure of quick change pin bush according to claim 1, wherein, One of the side wall surfaces of insert hole (31) is reference surface (32), and the reference surface (32) is a vertical plane.

6. The mold structure of quick change pin bush according to claim 5, wherein, The side wall surfaces of insert hole (31) are inclined surfaces except the reference surface (32), the cross-sectional area of insert hole (31) decreases from top to bottom, and the shapes of first insert (4) and second insert (5) are matched with the shape of insert hole (31).

7. The mold structure of quick change pin bush according to claim 1, wherein, First insert (4) is provided with mounting hole (45), and needle of cylinder insert (6) can be detachably installed in mounting hole (45).

8. The mold structure of quick change pin bush according to claim 7, wherein, The mounting hole (45) penetrates the top end and the bottom end of the first insert (4), the bottom end of the mounting hole (45) is provided with a counterbore structure (44), the bottom end of the sleeve insert needle (6) is provided with an abutting portion (61), and the abutting portion (61) abuts against the counterbore structure (44).

9. The mold structure of claim 8, wherein, The height of the counterbore structure (44) is higher than the height of the abutting portion (61), and the bottom end of the counterbore structure (44) is further provided with a pad (7), and the top end of the pad (7) abuts against the bottom end of the abutting portion (61).

10. The mold structure of quick change pin bush according to claim 1, wherein, The bottom surface of the mold plate (1) is provided with a fifth threaded hole (13), the fifth threaded hole (13) penetrates the mold plate (1), the bottom surface of the mold core (2) is provided with a sixth threaded hole (21), the fifth threaded hole (13) is aligned with the sixth threaded hole (21), and the third bolt (14) is further provided, the third bolt (14) is in threaded connection with the fifth threaded hole (13) and the sixth threaded hole (21).

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