CN217752549U - Plastic pipe inner wall glue feeding structure - Google Patents

Abstract

The utility model relates to an injection mold field, more specifically relates to a plastic pipe spare inner wall advances glued structure. A plastic pipe inner wall glue inlet structure comprises a runner insert, a fixed die insert, a plastic core, a movable die insert and a core pulling mechanism which is connected with the runner insert and drives the runner insert to move; the fixed die insert, the plastic part core and the movable die insert are provided with cavities for injection molding of plastic pipe fittings, the runner insert is provided with runner grooves and glue inlets, the glue inlets are respectively communicated with the runner grooves and the cavities, and the glue inlets are provided with knife edge structures used for contacting with the inner walls of the plastic pipe fittings after injection molding. The utility model discloses reducible injection pressure, and do not need the manual work to cut the runner, reduced manufacturing cost, shortened production procedure.

Description

Plastic pipe inner wall glue feeding structure

Technical Field

The utility model relates to an injection mold field, more specifically relates to a plastic pipe spare inner wall advances glued structure.

Background

Aiming at some pipe sleeve products in the field of PVC drainage at present, because the outer walls of the products are used for being inserted into corresponding sockets to realize connection, the outer walls of the pipe sleeve products need to be smooth and have no flaw to ensure that the pipe sleeve products can form a good sealing effect with the products corresponding to the sockets after being coated with glue, and if the outer walls of the pipe sleeve products are provided with a pouring gate, marks or flaws still remain after the pouring gate is removed, so that the assembly effect is not attractive and can be influenced. The Chinese patent discloses a plastic pipe fitting mold core inner wall type glue inlet structure, which comprises a mold fixed module and a movable module, wherein a sprue bush is arranged in the fixed module, a mold core is arranged between the movable module and the fixed module, and an injection molded pipe fitting is arranged between the mold core and the movable module as well as between the mold core and the fixed module. In the prior art, glue can be fed into the inner wall of the pipe fitting, and the effect that the sprue is positioned on the inner wall of the pipe fitting after injection molding is finished is achieved, but a glue inlet in the scheme of the comparison document is smaller, a smaller glue inlet needs larger glue inlet pressure, and the larger glue inlet pressure can cause the increase of residual stress in a product and finally cause the reduction of the product qualification rate; if the large glue inlet is made, a large sprue can appear after injection molding is finished, the large sprue is difficult to break, the section is uneven even if the sprue is broken, time is wasted if the sprue is manually cut, and the production cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome above-mentioned prior art and advance gluey not good condition of effect to plastics pipe fitting mould inner wall, provide a plastics pipe fitting inner wall advances glued structure.

In order to solve the technical problem, the utility model discloses a technical scheme is: a plastic pipe inner wall glue inlet structure comprises a runner insert, a fixed die insert, a plastic core, a movable die insert and a core pulling mechanism which is connected with the runner insert and drives the runner insert to move; the fixed die insert, the plastic part core and the movable die insert are provided with cavities for injection molding of plastic pipe fittings, the runner insert is provided with runner grooves and glue inlets, the glue inlets are respectively communicated with the runner grooves and the cavities, and the glue inlets are provided with knife edge structures used for contacting with the inner walls of the plastic pipe fittings after injection molding.

In the technical scheme, the plastic part core, the movable mold insert and the fixed mold insert are combined to form a cavity for injection molding of the plastic pipe fitting, and after injection molding is completed, one side wall surface of the plastic pipe fitting, which is in contact with the plastic part core, is the inner wall of the plastic part. The cavity for plastic pipe injection molding is connected with the runner groove arranged on the runner insert through the glue inlet, and the molten glue from the injection molding machine can enter the injection molding cavity of the plastic pipe through the runner groove on the runner insert for injection molding. After the cavity of the plastic pipe fitting is filled with the molten glue and is molded through pressure maintaining, cooling and curing, the plastic pipe fitting injection molding cavity can form the plastic pipe fitting, a cold runner material can be formed in a runner groove on the runner insert, the plastic pipe fitting and the cold runner material are connected together, and the cold runner material needs to be cut off. In the mold opening process, the movable mold insert leaves the plastic pipe firstly, and meanwhile, the core pulling mechanism is driven to move and is in transmission connection with the runner insert, the runner insert is driven to move in the core pulling mechanism moving process so as to drive cold runner materials formed in the runner groove to move, the cold runner materials connected to the plastic pipe can be easily cut off by the knife edge structure arranged on the glue inlet in the process of moving along with the runner insert, the runner insert can be pulled out in the operation step, the cold runner materials connected with the plastic pipe can also be cut off, and due to the arrangement of the knife edge, the inner wall of the plastic pipe can keep smooth and tidy effects.

Furthermore, the runner insert is provided with a bulge, the glue inlet is arranged on the bulge, one end of the plastic part core is provided with a groove matched with the bulge, and the bulge is arranged in the groove.

In the technical scheme, the runner insert is provided with a bulge, the glue inlet is arranged on the bulge of the runner insert, and one end of the plastic part core is provided with a groove matched with the bulge. When the runner insert is used, the bulge arranged on the runner insert can be inserted into the groove matched with the runner insert on the plastic part core, one side of the bulge of the runner insert provided with the glue inlet is close to the outer surface of the plastic part core, and the runner insert contacts with the plastic pipe after the injection molding is finished. The bulge part arranged on the runner insert is tightly matched with the groove on the plastic part core, and the molten glue can only flow on the plastic pipe cavity and the runner groove.

Furthermore, the number of the protruding portions is two, and the number of the glue inlets formed in the runner insert is also two.

In the technical scheme, the runner groove arranged on the surface of the runner insert is provided with two glue inlets. The runner insert is provided with two bulges which are respectively inserted into the grooves of the two plastic cores. The structure with two glue inlets can produce two plastic parts at the same time, thereby greatly increasing the production efficiency.

Furthermore, a chamfer is arranged on the bulge, and a chamfer is also arranged in the groove on the plastic part core.

In this technical scheme, locate the chamfer on the bellying and be favorable to the assembly between runner mold insert and the winding core.

Further, the core pulling mechanism comprises a fixed die plate, an inclined guide post and a first sliding block provided with an inclined through hole; the first sliding block is connected with the runner insert, and the inclined guide post is fixed on the fixed die plate and is installed in the inclined through hole.

In the technical scheme, the core pulling mechanism comprises a fixed template, an inclined guide post and a first sliding block provided with an inclined through hole; the first sliding block is connected with the runner insert, and the inclined guide pillar is fixed on the fixed die plate and is installed in the inclined through hole. The plastic part core is wrapped by the fixed die insert and the movable die insert to form a cavity for injection molding of the plastic pipe fitting. The fixed die plate covers the fixed die insert and is tightly matched with the fixed die insert; one end of an inclined guide pillar is obliquely arranged on the fixed die plate and can move along with the fixed die plate, the other end of the inclined guide pillar penetrates into an inclined through hole formed in the first sliding block in an inclined mode, the inclined guide pillar can move in the inclined through hole, the fixed die plate moves and can drive the inclined guide pillar connected with the fixed die plate to move, and then the first sliding block connected with the inclined guide pillar is driven to move. The first sliding block is in transmission connection with the runner insert, the runner insert can be driven to move by the movement of the first sliding block, and then cold runner materials formed on the runner groove after injection molding are driven to move. In the demolding process, the gate can be cut off by the knife edge structure arranged on the glue inlet of the runner insert in the drawing process, so that the whole cold runner is drawn away along with the runner insert until the runner insert slide block is drawn in place. In the process, the runner insert and the cold runner material can be extracted by matching the inclined guide post with the inclined through hole arranged on the first sliding block, and the cold runner material can be cut off from the plastic pipe piece by the knife edge structure arranged on the glue inlet.

The injection molding device further comprises an ejection mechanism for ejecting the runner material out of the runner insert after injection molding is finished, and the ejection mechanism is arranged below the runner insert.

In the technical scheme, the injection molding device further comprises an ejection mechanism for ejecting the runner material after injection molding out of the runner insert, and the ejection mechanism is arranged below the runner insert.

Further, the ejection mechanism comprises a mounting plate, a movable template and a flow channel thimble; the mounting plate is externally connected with a driving device for driving the mounting plate to move, one end of the runner thimble is arranged on the mounting plate, the other end of the runner thimble penetrates through the movable die plate and the movable die insert and can move in the movable die plate and the movable die insert, and the runner thimble penetrates through the runner insert with the ejection hole and ejects out runner materials.

In the technical scheme, the ejection mechanism comprises an installation plate and a flow channel thimble; one end of the runner thimble is arranged on the mounting plate, the other end of the runner thimble penetrates through the runner thimble, penetrates through the movable mould plate and the movable mould insert, can move in the movable mould plate and the movable mould insert and is positioned below the limit position where the runner insert is drawn out, and at the moment, the runner thimble can penetrate through the runner insert with the ejection hole and eject out the runner material. In the mold opening process, the mounting plate can move towards the direction of the plastic part under the condition that the external driving device provides power, and the movement of the mounting plate can simultaneously drive the runner ejector pin connected to the mounting plate to move towards the direction of the runner insert. When the core pulling of the runner insert is in place, the runner insert is located at the limit position of the core pulling state of the runner insert, the runner insert is located above the end, not connected with the mounting plate, of the runner ejector pin, and the runner ejector pin is aligned to the ejection hole formed in the runner insert. In the cold runner material ejection process, the mounting plate moves to drive the runner ejector pin fixed on the mounting plate to move towards the runner insert, and the runner ejector pin penetrates through the runner insert through an ejection hole in the runner insert and ejects the cold runner material left on the runner insert after injection molding is completed.

Furthermore, the number of the ejection holes is three, and the number of the flow channel ejection rods is consistent with that of the ejection holes.

In the technical scheme, three ejection holes are formed, and the number of the flow channel ejection rods is consistent with that of the ejection holes. The material can firmly adhere on the runner groove of the runner insert in the cooling process, and the three runner thimbles are arranged, so that the cold runner material can more easily fall off from the runner groove in the ejection process, and the effect of convenient ejection is achieved.

Furthermore, the ejection mechanism also comprises a plastic ejector pin arranged on the mounting plate; one end of the plastic ejector pin is fixed on the mounting plate and located below the plastic core, and through holes for the plastic ejector pin to move are formed in the movable die plate and the movable die insert.

In the technical scheme, the plastic part ejection device further comprises a plastic part ejection pin arranged on the mounting plate; one end of the plastic ejector pin is fixed on the mounting plate and located below the plastic mold core, and through holes for the plastic ejector pin to move are formed in the movable mold plate and the movable mold insert. When the mold is opened, after the plastic part core and the runner insert are drawn out of the mold, the mounting plate can move towards the plastic pipe fitting, the plastic part ejector pins fixed on the mounting plate are driven to move towards the plastic pipe fitting, and the plastic part ejector pins can eject the plastic pipe fitting out of the movable mold insert in the moving process, so that the effect of separating from the plastic pipe fitting is achieved.

Compared with the prior art, the beneficial effects of the utility model are that: the inner wall is carried out to the pipe fitting mould and the mouth that advances when gluing can adopt great to mould plastics, reduces the pressure of moulding plastics for the product outer wall is smooth flawless, and the result of use is better, and has set up the edge of a knife structure and can cut off the runner by oneself advancing the mouth of a glue, does not need the manual work to cut the runner, has reduced manufacturing cost, has shortened production flow.

Drawings

FIG. 1 is a schematic view of the overall structure of the plastic pipe inner wall glue feeding structure of the present invention;

fig. 2 is a perspective view of the runner insert of the plastic pipe inner wall glue inlet structure of the utility model;

FIG. 3 is a perspective view of the plastic core of the plastic pipe inner wall glue-feeding structure of the present invention;

fig. 4 is a schematic structural view illustrating that the runner material of the plastic pipe inner wall glue inlet structure is ejected;

fig. 5 is a perspective view of the plastic pipe inner wall glue-feeding structure flow passage material ejected out.

In the drawings: 1. a runner insert; 11. a runner groove; 12. a glue inlet; 13. a knife edge structure; 14. a boss portion; 15. an ejection aperture; 2. a fixed die insert; 3. a plastic pipe; 4. molding a mold core of the plastic part; 41. a groove; 5. a movable mold insert; 61. fixing a template; 62. an inclined guide post; 63. a first slider; 7. a flow channel material; 81. mounting a plate; 82. moving the template; 83. a flow passage thimble; 84. and a plastic ejector pin.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "long", "short", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations of the present patent, and specific meanings of the above terms can be understood according to specific situations by those of ordinary skill in the art.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example 1

As shown in fig. 1,2,3,4,5, a plastic pipe inner wall glue feeding structure: the plastic pipe fitting mold comprises a runner insert 1, a fixed mold insert 2, a plastic pipe fitting 3, a plastic part core 4, a movable mold insert 5 and a core pulling mechanism; the plastic part core 4, the movable mold insert 5 and the fixed mold insert 2 are combined to form a cavity for injection molding of the plastic pipe 3, and after injection molding is finished, the wall surface of one side of the plastic pipe 3, which is in contact with the plastic part core 4, is the inner wall of the plastic part. In this embodiment, the cavity for injection molding of the plastic pipe 3 is connected to the runner groove 11 of the runner insert 1 through the glue inlet 12, and the molten glue flowing out of the injection molding machine can enter the injection molding cavity of the plastic pipe 3 through the runner groove 11 of the runner insert 1 for injection molding. After the cavity of the plastic pipe 3 is filled with molten glue and is molded through pressure maintaining, cooling and curing, the plastic pipe 3 injection molding cavity can form the plastic pipe 3, cold runner materials 7 can be formed in the runner groove 11 on the runner insert 1, the plastic pipe 3 and the cold runner materials 7 are connected together, and the cold runner materials 7 need to be cut off. In the mold opening process, the movable mold insert 5 leaves the plastic pipe 3, and meanwhile, the core pulling mechanism is driven to move and is in transmission connection with the runner insert 1, the core pulling mechanism can drive the runner insert 1 to move and further drive the cold runner material 7 formed in the runner groove 11 to move, the cold runner material 7 connected to the plastic pipe 3 can be easily cut off by the knife edge structure 13 arranged on the runner insert 1 in the process of moving along with the runner insert 1, the runner insert 1 can be pulled out and the cold runner material 7 connected with the plastic pipe 3 can be cut off in the operation step, and due to the arrangement of the knife edge structure 13, the inner wall of the plastic pipe 3 can keep smooth and tidy effects.

In addition, the runner insert 1 is provided with a bulge 14, the glue inlet 12 is arranged on the bulge 14 of the runner insert 1, and one end of the plastic part core 4 is provided with a groove 41 matched with the bulge 14. In this embodiment, when in use, the protrusion on the runner insert 1 is inserted into the matching recess 41 on the plastic core 4, and the side of the protrusion 14 with the glue inlet 12 is close to the outer surface of the plastic core 4 and contacts the plastic pipe 3 after the injection molding. The bulge 14 arranged on the runner insert 1 is tightly matched with the groove 41 on the plastic part core 4, and the molten glue can only flow on the cavity of the plastic pipe 3 and the runner groove 11. The runner groove 11 arranged on the surface of the runner insert 1 is provided with two glue inlets 12. The runner insert 1 is provided with two protrusions 14, and the two protrusions 14 are inserted into the grooves 41 of the two plastic cores 4 respectively. The structure with two glue inlets 12 can produce two plastic parts at the same time, thereby greatly increasing the production efficiency.

Example 2

As shown in fig. 1,2,3,4 and 5, the core-pulling mechanism includes a fixed die plate 61, an inclined guide post 62 and a first slide block 63 provided with an inclined through hole; the first slide block 63 is connected with the runner insert 1, and the inclined guide post 62 is fixed on the fixed die plate 61 and sleeved in the inclined through hole. In this embodiment, the plastic core 4 is wrapped by the fixed mold insert 2 and the movable mold insert 5 to form a cavity to be injection molded. The fixed die plate 61 covers the fixed die insert 2 and is tightly matched with the fixed die insert 2, the inclined guide post 62 is arranged on the fixed die plate 61 and can move along with the fixed die plate 61, the inclined guide post 62 is obliquely arranged on the fixed die plate 61, one section of the inclined guide post is positioned in the fixed die plate 61, and the other section of the inclined guide post extends out of the fixed die plate 61. A section of the inclined guide post 62 extending out of the fixed die plate 61 obliquely penetrates into the inclined through hole formed in the first slide block 63, and the inclined guide post 62 can move in the inclined through hole. The first sliding block 63 is in transmission connection with the runner insert 1, and the first sliding block 63 can move to drive the runner insert 1 to move, so that the cold runner material 7 formed on the runner groove 11 after injection molding is driven to move. The plastic pipe fitting 3 can be kept away from to fixed die plate 61 in the die sinking process, the oblique guide pillar 62 of locating on fixed die plate 61 can follow and leave plastic pipe fitting 3, after fixed die plate 61 opened a certain distance, oblique guide pillar 62 of being connected with fixed die plate 61 can touch the oblique guide pillar 62 hole of locating on first slider 63 at the removal in-process, first slider 63 is moved by oblique guide pillar 62 butt and driven by oblique guide pillar 62 this moment, first slider 63 in the removal can drive runner mold insert 1 and the runner material 7 that forms on runner groove 11 toward the one side of keeping away from plastic pipe fitting 3 and draw together. In the process, the gate can be cut off by the knife edge structure 13 arranged on the glue inlet 12 of the runner insert 1 in the drawing process, so that the whole cold runner is drawn away together with the runner insert 1 until the slide block of the runner insert 1 is drawn in place. In the process, the runner insert 1 and the cold runner 7 can be drawn out through the matching of the inclined guide post 62 and the inclined through hole arranged on the first sliding block 63, and the cold runner 7 can be cut off from the plastic pipe 3 through the knife edge structure 13 arranged on the glue inlet 12.

Example 3

As shown in fig. 1,2,3,4 and 5, in this embodiment, an ejection mechanism is included for ejecting the runner material 7 after the injection molding is completed, and the ejection mechanism is disposed below the runner insert 1. The ejection mechanism comprises a mounting plate 81, a movable membrane plate and a flow channel thimble 83; one end of the runner thimble 83 is arranged on the mounting plate 81, the other end of the runner thimble 83 passes through the movable mould plate 82 and the movable mould insert 5, can move in the movable mould plate 82 and the movable mould insert 5, and is positioned below the limit position where the runner insert 1 is drawn out, and at the moment, the runner thimble 83 can pass through the runner insert 1 provided with the ejection hole 15 and eject the runner material 7. In the mold opening process, the mounting plate 81 moves towards the plastic part under the condition that the external driving device provides power, and the movement of the mounting plate 81 drives the runner ejector pin 83 connected thereto to move towards the runner insert 1. When the runner insert 1 is subjected to core pulling in place, the runner insert 1 is located at the extreme position of the core pulling state, and the runner thimble 83 is aligned with the ejection hole 15 formed in the runner insert 1. In the process of ejecting the cold runner material 7, the mounting plate 81 moves to drive the runner thimble 83 fixed on the mounting plate to move towards the runner insert 1, and the runner thimble 83 passes through the ejection hole 15 formed in the runner insert 1, passes through the runner insert 1 and ejects the cold runner material 7 left on the runner insert 1 after the injection molding is completed.

In addition, the number of the ejection holes 15 is three, and the number of the flow channel ejection rods is consistent with that of the ejection holes 15. The material can firmly adhere to the runner groove 11 of the runner insert 1 in the cooling process, and the three runner ejector pins 83 are arranged, so that the cold runner material 7 can more easily fall off from the runner groove 11 in the ejection process, and the effect of convenient ejection is achieved.

Moreover, the device also comprises a plastic ejector pin arranged on the mounting plate 81; one end of the plastic ejector pin is fixed on the mounting plate 81 and located below the plastic core 4, and the movable die plate 82 and the movable die insert 5 are provided with through holes for the plastic ejector pin to move. During mold opening, after the plastic part core 4 and the flow channel insert 1 are pulled out of the mold, the mounting plate 81 can move towards the plastic pipe fitting 3, meanwhile, the plastic part ejector pin fixed on the mounting plate 81 is driven to move towards the plastic pipe fitting 3, the plastic part ejector pin can eject the plastic pipe fitting 3 out of the movable film insert in the moving process, and the effect of separating from the plastic pipe fitting 3 is achieved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a plastic pipe spare inner wall advances glued structure which characterized in that: the core pulling mechanism comprises a runner insert (1), a fixed die insert (2), a plastic part core (4), a movable die insert (5) and a core pulling mechanism which is connected with the runner insert (1) and drives the runner insert to move; the plastic pipe fitting injection molding device is characterized in that a cavity for injection molding of the plastic pipe fitting (3) is formed in the fixed die insert (2), the plastic part core (4) and the movable die insert (5), a runner groove (11) and a glue inlet (12) are formed in the runner insert (1), the glue inlet (12) is communicated with the runner groove (11) and the cavity respectively, and a knife edge structure (13) which is used for being in contact with the inner wall of the plastic pipe fitting (3) after injection molding is completed is arranged at the glue inlet (12).

2. The plastic pipe inner wall glue feeding structure of claim 1, wherein: the runner insert (1) is provided with a bulge (14), the glue inlet (12) is formed in the bulge (14), a groove (41) matched with the bulge (14) is formed in one end of the plastic part core (4), and the bulge (14) is installed in the groove (41).

3. The plastic pipe inner wall glue feeding structure of claim 2, wherein: the number of the protruding portions (14) is two, and the number of the glue inlets (12) formed in the runner insert (1) is also two.

4. The plastic pipe inner wall glue feeding structure according to claim 3, wherein: the two glue inlets (12) are oppositely arranged.

5. The plastic pipe inner wall glue feeding structure of claim 2, wherein: the protruding portion (14) is provided with a chamfer, and the chamfer is also arranged in the groove (41) on the plastic part mold core (4).

6. The plastic pipe inner wall glue feeding structure as claimed in claim 1, wherein: the core-pulling mechanism comprises a fixed template (61), an inclined guide post (62) and a first sliding block (63) provided with an inclined through hole; the first sliding block (63) is connected with the runner insert (1), and the inclined guide post (62) is fixed on the fixed die plate (61) and is installed in the inclined through hole.

7. The plastic pipe inner wall glue feeding structure as claimed in claim 1, wherein: the injection molding device is characterized by further comprising an ejection mechanism for ejecting runner materials (7) formed in the runner groove (11) after injection molding is finished, wherein the ejection mechanism is arranged below the runner insert (1).

8. The plastic pipe inner wall glue feeding structure according to claim 7, wherein: the ejection mechanism comprises an installation plate (81), a movable template (82) and a flow channel thimble (83); the mounting plate (81) is externally connected with a driving device for driving the mounting plate to move, one end of a flow channel thimble (83) is arranged on the mounting plate (81), the other end of the flow channel thimble passes through the movable mould plate (82) and the movable mould insert (5) and can move in the movable mould plate (82) and the movable mould insert (5), and the flow channel thimble (83) passes through the flow channel insert (1) with the ejection hole (15) and ejects a flow channel material (7).

9. The plastic pipe inner wall glue feeding structure according to claim 8, wherein: the number of the ejection holes (15) is three, and the number of the flow channel ejection pins (83) is consistent with that of the ejection holes (15).

10. The plastic pipe inner wall glue feeding structure according to claim 8, wherein: the ejection mechanism also comprises a plastic ejector pin (84) arranged on the mounting plate (81); one end of the plastic ejector pin (84) is fixed on the mounting plate (81) and located below the plastic core (4), and through holes for the plastic ejector pin (84) to move are formed in the movable die plate (82) and the movable die insert (5).

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