CN119388692A

CN119388692A - Injection mold

Info

Publication number: CN119388692A
Application number: CN202411484809.6A
Authority: CN
Inventors: 缪怀俊
Original assignee: Shanghai Dingrui Mould Technology Co ltd
Current assignee: Shanghai Dingrui Mould Technology Co ltd
Priority date: 2024-10-23
Filing date: 2024-10-23
Publication date: 2025-02-07

Abstract

The application relates to the technical field of molds, in particular to an injection mold, which comprises a movable mold assembly and a fixed mold assembly. The movable die assembly comprises a movable die bottom plate, a movable die frame and a movable die core, wherein the movable die frame is arranged on the movable die bottom plate, the movable die core is embedded in one side, deviating from the movable die bottom plate, of the movable die frame, an injection molding opening is formed in the movable die bottom plate, a runner is formed in the movable die frame, a plurality of split-flow openings are formed in the movable die frame, the runner is respectively communicated with the injection molding opening and the split-flow openings, the fixed die assembly comprises a fixed die bottom plate and a fixed die core embedded in the fixed die bottom plate, a cavity is formed between the fixed die core and the movable die core, and the split-flow openings are respectively communicated with the cavity. The application has the effect of reducing the possibility of product percent of pass reduction.

Description

Injection mold

Technical Field

The application relates to the technical field of molds, in particular to an injection mold.

Background

At present, injection molding is a processing method used for mass production of parts with complex shapes, specifically, injection molding materials melted by heating are injected into a mold cavity of an injection mold under high pressure by an injection molding machine, and a formed product is obtained after cooling and solidification. The injection mold consists of a movable mold and a fixed mold, wherein the movable mold is arranged on a movable mold plate of the injection molding machine, the fixed mold is arranged on a fixed mold plate of the injection molding machine, the movable mold and the fixed mold are closed to form a pouring system and a cavity during injection molding, and the movable mold and the fixed mold are separated during mold opening so as to take out injection molding products.

In the related technology, in the injection molding process, the injection molding material usually enters the mold cavity through a single injection port, and the distribution of the injection molding material in the mold cavity is mainly influenced by fluidity, so that when products with complex structures such as a net-shaped dust cover and the like are produced, the condition of uneven distribution of the injection molding material is easy to occur in a region far from the injection port, and the product qualification rate is reduced.

Disclosure of Invention

In order to reduce the possibility of product yield reduction, the application provides an injection mold.

The application provides an injection mold, which adopts the following technical scheme:

an injection mold, comprising:

the movable die assembly comprises a movable die bottom plate, a movable die frame and a movable die core, wherein the movable die frame is arranged on the movable die bottom plate, the movable die core is embedded in one side, away from the movable die bottom plate, of the movable die frame, an injection molding opening is formed in the movable die bottom plate, a runner is formed in the movable die frame, a plurality of split-flow openings are formed in the movable die frame, and the runner is respectively communicated with the injection molding opening and the split-flow openings;

the fixed die assembly comprises a fixed die bottom plate and a fixed die core embedded on the fixed die bottom plate, a cavity is formed between the fixed die core and the movable die core, and a plurality of shunt ports are respectively communicated with the cavity.

Through adopting above-mentioned technical scheme, after injecting the material of moulding plastics from the mouth of moulding plastics, the material of moulding plastics can flow into the runner earlier in, in a plurality of shunt ports of runner inflow again, finally flow into the die cavity through the shunt ports in to help making the material of moulding plastics faster evenly distributed to each part in the die cavity, with the material of reducing moulding plastics maldistribution, lead to the possibility that the product qualification rate reduces, and then be favorable to improving the qualification rate of product.

Optionally, a protection component is arranged between the fixed die bottom plate and the movable die frame, and the protection component is used for reducing the impact between the fixed die bottom plate and the movable die frame.

Through adopting above-mentioned technical scheme, when the movable mould bottom plate drives movable mould frame and movable mould benevolence to the direction removal of cover half bottom plate to accomplish the compound die, protection component can cushion the movable mould frame, in order to alleviate the striking between cover half bottom plate and the movable mould frame, thereby be favorable to reducing the possibility that damage appears between cover half bottom plate and the movable mould frame, and then be favorable to prolonging the life of mould.

Optionally, the protection subassembly includes butt piece, connecting seat, lower butt piece and elastic component, it is in to go up the butt piece sets up on the lateral wall of movable mould frame, the connecting seat sets up on the cover half bottom plate and with go up the butt piece and set up relatively, first spout has been seted up on the connecting seat, the butt piece slides down and inserts establish in the first spout, the elastic component sets up in the first spout and with the butt piece is connected down, works as the cover half bottom plate with the movable mould frame is close to each other, go up the butt piece and insert and establish in the first spout.

Through adopting above-mentioned technical scheme, when movable mould bottom plate drive movable mould frame and movable mould benevolence to being close to the direction of cover half bottom plate and remove, movable mould frame drive and go up the butt piece and remove for go up the butt piece and contradict with lower butt piece and exert pressure to lower butt piece, lower butt piece exerts pressure to the elastic component, so that the elastic component compresses. At this time, the elastic piece can absorb impact energy to alleviate the striking between cover half bottom plate and the movable mould frame, thereby be favorable to reducing the possibility that damage appears between cover half bottom plate and the movable mould frame. And when fixed die bottom plate and movable die carrier subsides, go up the butt piece and can insert and establish to in the first spout for go up butt piece and connecting seat and mutually support, can carry out spacingly to fixed die bottom plate and movable die carrier, and then be favorable to reducing the position of fixed die bottom plate and movable die carrier and take place the possibility of skew.

Optionally, the stop slot has been seted up on the upper butt piece, the second spout has been seted up along the horizontal direction on the cover half bottom plate, the second spout with first spout intercommunication, the stopper has been inserted in the second spout slip, the stopper can be inserted establish in the stop slot.

Through adopting above-mentioned technical scheme, when last butt piece inserts and establishes to in the first spout, the locating part can insert and establish in the spacing inslot to carry out spacingly to last butt piece, make and go up the butt piece and be difficult for removing outside first spout, thereby further improved the compound die after, connection stability between cover half bottom plate and the movable mould frame.

Optionally, a thermal expansion piece is arranged in the second chute, and the thermal expansion piece is connected with the limiting block and is positioned at one side of the limiting block, which is close to the cavity.

Through adopting above-mentioned technical scheme, when injecting injection molding material to the die cavity in, the die cavity internal temperature risees for thermal expansion spare is heated and is taken place the inflation, with promoting the stopper removal, thereby is convenient for insert the stopper and establish to the spacing inslot, with spacing to last butt piece, helps realizing the fixed between cover half bottom plate and the movable mould frame. And after the product in the die cavity is fully cooled, the temperature is reduced, and the thermal expansion piece contracts to drive the limiting block to separate from the limiting groove, so that the limiting block does not limit the upper abutting block any more, and the fixed die bottom plate and the movable die frame are conveniently separated.

Optionally, the thermal expansion member is made of a phase change material.

Through adopting above-mentioned technical scheme, the thermal expansion piece adopts phase change material to make for the thermal expansion piece can absorb the unnecessary heat of injection molding in-process, and in the mould cooling stage, release the heat of storage, thereby help making the mould cool off more evenly, and slowed down the speed that the mould switches between high temperature and low temperature, and then be favorable to reducing thermal shock, so that the mould is difficult for causing material fatigue or crackle because of thermal shock, prolonged the life of mould to a certain extent.

Optionally, the protection subassembly is provided with a plurality ofly, and a plurality of the protection subassembly is followed the circumference evenly distributed of cover half bottom plate.

Through adopting above-mentioned technical scheme, a plurality of protection components mutually support, have further alleviateed the striking between cover half bottom plate and the movable mould frame to be favorable to reducing the possibility that damage appears between cover half bottom plate and the movable mould frame, and then be favorable to prolonging the life of mould.

Optionally, the four apex angle positions of cover half bottom plate all are provided with the reference column, the constant head tank has been seted up on the movable mould frame, the quantity of constant head tank with the reference column equals, and one the reference column inserts and establishes one in the constant head tank.

Through adopting above-mentioned technical scheme, the reference column can be inserted and establish in the constant head tank to be convenient for in the compound die in-process on the one hand, fix a position cover half bottom plate and movable mould frame, so that cover half bottom plate and movable mould frame can align, on the other hand can carry out spacing to cover half bottom plate and movable mould frame, in order to reduce the possibility that the position of cover half bottom plate and movable mould frame takes place the skew.

Optionally, one side of cover half bottom plate deviates from the cover half benevolence is provided with the thimble subassembly, the thimble subassembly is used for ejecting out the product from the die cavity.

Through adopting above-mentioned technical scheme, the setting of thimble subassembly is convenient for after the completion of moulding plastics, release the product from the die cavity to the drawing of patterns of completion product of being convenient for.

Optionally, the thimble subassembly includes thimble board and sets up many thimbles on the thimble board, the thimble board sliding connection in the cover half bottom plate, the thimble wear to establish the cover half bottom plate and with the die cavity corresponds, the thimble board is used for the drive the thimble removes.

Through adopting above-mentioned technical scheme, when need carrying out the drawing of patterns to the product, remove the thimble board, the thimble board drives the thimble and removes for in the thimble inserts and establishes to the die cavity, so that the thimble is ejecting the product in the follow die cavity, thereby accomplishes the drawing of patterns of product.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Through the mutual matching of the movable mold bottom plate, the movable mold frame, the movable mold core, the fixed mold bottom plate and the fixed mold core, injection molding materials can flow into the cavity through the injection molding opening, the runner and the plurality of split-flow openings in sequence, so that the injection molding materials are uniformly distributed to each part of the cavity, the possibility of reducing the product percent of pass caused by uneven distribution of the injection molding materials is reduced, and the product percent of pass is further improved;

2. Through the mutual matching of the upper abutting block, the connecting seat, the lower abutting block and the elastic piece, when the movable die frame drives the upper abutting block to move towards the direction close to the fixed die bottom plate, the upper abutting block can apply pressure to the elastic piece through the lower abutting block so as to enable the elastic piece to absorb impact energy, thereby being beneficial to reducing the impact between the fixed die bottom plate and the movable die frame, reducing the possibility of damage between the fixed die bottom plate and the movable die frame, and at the moment, the upper abutting block and the connecting seat can limit the fixed die bottom plate and the movable die frame together so as to reduce the possibility of deviation of the positions of the fixed die bottom plate and the movable die frame;

3. Through the mutual matching of the upper abutting block, the limiting block and the thermal expansion piece, when injection molding materials are injected into the cavity, the thermal expansion piece can be heated to expand so as to push the limiting block to be inserted into the limiting groove, thereby being convenient for limiting the upper abutting block by using the limiting block so as to realize the fixation between the fixed die bottom plate and the movable die frame, and after the products in the cavity are sufficiently cooled, the thermal expansion piece can be contracted so as to drive the limiting block to be separated from the limiting groove, and further being convenient for the separation of the fixed die bottom plate and the movable die frame;

4. the thermal expansion piece is made of phase-change materials, so that the thermal expansion piece can absorb redundant heat in the injection molding process, and in the cooling stage of the mold, stored heat is released, so that the mold can be cooled more uniformly, the switching speed of the mold between high temperature and low temperature is slowed down, the thermal shock is reduced, the material fatigue or crack of the mold is not easy to be caused by the thermal shock, and the service life of the mold is prolonged to a certain extent.

Drawings

Fig. 1 is a schematic view showing the overall structure of an injection mold in embodiment 1 of the present application.

Fig. 2 is a schematic diagram showing an exploded structure of an injection mold in example 1 of the present application.

Fig. 3 is a cross-sectional view taken along line A-A of fig. 1.

Fig. 4 is a schematic diagram showing an exploded structure of an injection mold according to another view angle in embodiment 1 of the present application.

Fig. 5 is a front view of an injection mold in embodiment 2 of the present application.

Fig. 6 is a sectional view taken along line B-B of fig. 5.

Reference numerals illustrate:

1. the plastic injection molding device comprises a movable mold assembly, 11, a movable mold bottom plate, 111, an injection molding port, 12, a movable mold frame, 121, a runner, 122, a split port, 123, a positioning groove, 13, a movable mold core, 2, a fixed mold assembly, 21, a fixed mold bottom plate, 211, a positioning column, 212, a second sliding groove, 213, a limiting block, 214, a thermal expansion piece, 22, a fixed mold core, 23, a cavity, 3, an ejector pin assembly, 31, an ejector pin plate, 32, an ejector pin, 4, a protection assembly, 41, an upper abutting block, 411, a limiting groove, 42, a connecting seat, 421, a first sliding groove, 43, a lower abutting block, 44 and an elastic piece.

Detailed Description

The application is described in further detail below with reference to fig. 1-6.

The embodiment of the application discloses an injection mold.

It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Example 1

Referring to fig. 1, the injection mold includes a movable mold assembly 1, a fixed mold assembly 2, and a thimble assembly 3. Wherein, movable mould subassembly 1 sets up with cover half subassembly 2 relatively, and thimble assembly 3 sets up in the one side that cover half subassembly 2 deviate from movable mould subassembly 1, and thimble assembly 3 is used for realizing the product drawing of patterns.

Referring to fig. 2 and 3, the movable mold assembly 1 includes a movable mold base 11, a movable mold frame 12, and a movable mold core 13. The movable mold frame 12 is fixedly connected to the movable mold bottom plate 11, the movable mold core 13 is embedded in one side of the movable mold frame 12 away from the movable mold bottom plate 11, an injection molding opening 111 is formed in the movable mold bottom plate 11, a runner 121 is formed in one side of the movable mold frame 12, which is close to the movable mold bottom plate 11, a plurality of split-flow openings 122 are formed in the movable mold frame 12, and the runner 121 is respectively communicated with the injection molding opening 111 and the split-flow openings 122.

Referring to fig. 2 and 4, the stationary mold assembly 2 includes a stationary mold base 21 and a stationary mold insert 22 inserted on the stationary mold base 21. Wherein, the four vertex angle positions of the fixed die bottom plate 21 are fixedly connected with positioning columns 211, the movable die frame 12 is provided with positioning grooves 123, the number of the positioning grooves 123 is equal to that of the positioning columns 211, and the positioning columns 211 are inserted into the positioning grooves 123.

When the movable mold base 11 drives the movable mold frame 12 to move towards the direction close to the fixed mold base 21, the positioning columns 211 can be inserted into the positioning grooves 123, so that the fixed mold base 21 and the movable mold frame 12 can be positioned in the mold closing process, the fixed mold base 21 and the movable mold frame 12 can be aligned, and the fixed mold base 21 and the movable mold frame 12 can be limited, so that the possibility of deviation of the positions of the fixed mold base 21 and the movable mold frame 12 is reduced.

Referring to fig. 2 and 3, when the fixed mold bottom plate 21 is attached to the movable mold frame 12, the fixed mold bottom plate 21 and the movable mold frame 12 are in a mold closing state, a relatively closed cavity 23 is formed between the fixed mold core 22 and the movable mold core 13, and the plurality of split openings 122 are respectively communicated with the cavity 23, so that injection molding material can flow into each part in the cavity 23 through the split openings 122.

Referring to fig. 2, the ejector pin assembly 3 includes an ejector pin plate 31 and a plurality of ejector pins 32 fixedly coupled to the ejector pin plate 31. The ejector pin plate 31 is slidably connected to a side of the fixed mold bottom plate 21 away from the movable mold core 13, and the ejector pin 32 penetrates the fixed mold bottom plate 21 and is disposed corresponding to the cavity 23.

When the product needs to be demolded, the ejector plate 31 is moved, and the ejector plate 31 drives the ejector pins 32 to move, so that the ejector pins 32 are inserted into the cavity 23, the ejector pins 32 can eject the product from the cavity 23, and the demolding of the product is completed.

The implementation principle of the injection mold of the embodiment of the application is that after the movable mold frame 12 is attached to the fixed mold bottom plate 21 to realize mold closing, injection molding materials are injected from the injection molding opening 111, so that the injection molding materials flow into the runner 121 through the injection molding opening 111, flow into the plurality of split-flow openings 122 through the runner 121 and finally flow into the mold cavity 23 through the split-flow openings 122, thereby facilitating the injection molding materials to be more quickly and uniformly distributed to each part of the mold cavity 23 to realize injection molding of products.

After the product molded in the cavity 23 is sufficiently cooled, the movable die base 11 drives the movable die carrier 12 and the movable die core 13 to move away from the fixed die base 21 so as to realize die opening, and then the ejector plate 31 is moved so as to eject the product from the cavity 23 by using the ejector pins 32, thereby completing the demolding operation.

In the embodiment of the application, the injection molding material can be uniformly distributed to each part of the cavity 23 through the arrangement of the runner 121 and the plurality of shunt ports 122, so that the possibility of reducing the non-uniform distribution of the injection molding material and reducing the qualification rate of products is reduced, and the qualification rate of the products is improved.

Example 2

Referring to fig. 5, this embodiment is different from embodiment 1 in that a protection member 4 is provided between a fixed mold base 21 and a movable mold frame 12.

Referring to fig. 5 and 6, the protection assembly 4 is provided in plurality, the plurality of protection assemblies 4 are uniformly distributed along the circumferential direction of the fixed mold base plate 21, and the protection assembly 4 includes an upper abutment block 41, a connection seat 42, a lower abutment block 43, and an elastic member 44. Wherein, the upper abutting block 41 is fixedly connected on the side wall of the movable mold frame 12, and the connecting seat 42 is fixedly connected on the fixed mold bottom plate 21 and is arranged opposite to the upper abutting block 41.

Referring to fig. 6, a first sliding groove 421 is formed on the connecting seat 42, and the lower abutting block 43 is slidably inserted in the first sliding groove 421 and is attached to an inner wall of the first sliding groove 421, and the elastic member 44 is disposed in the first sliding groove 421 and is fixedly connected with the lower abutting block 43. In this embodiment, the elastic member 44 is a spring. In other embodiments, the elastic member 44 may be provided as a balloon.

When the movable mold base 11 drives the movable mold frame 12 to move in a direction approaching the fixed mold base 21, the movable mold frame 12 drives the upper abutting block 41 to move, so that the upper abutting block 41 abuts against the lower abutting block 43 and applies pressure to the lower abutting block 43, and the lower abutting block 43 applies pressure to the elastic member 44, so that the elastic member 44 is compressed. At this time, the elastic member 44 can absorb the impact energy to alleviate the impact between the fixed mold base 21 and the movable mold frame 12, thereby being beneficial to reducing the possibility of damage occurring between the fixed mold base 21 and the movable mold frame 12.

When the fixed die bottom plate 21 is attached to the movable die frame 12, the upper abutting block 41 can be inserted into the first sliding groove 421 and attached to the inner wall of the first sliding groove 421, so that the upper abutting block 41 and the connecting seat 42 are matched with each other, the fixed die bottom plate 21 and the movable die frame 12 can be limited, and the possibility of deviation of the positions of the fixed die bottom plate 21 and the movable die frame 12 is reduced.

Referring to fig. 6, the upper abutment block 41 is provided with a limiting slot 411, the fixed mold bottom plate 21 is provided with a second sliding slot 212 along the horizontal direction, the second sliding slot 212 is communicated with the first sliding slot 421, and the second sliding slot 212 is internally slidably inserted with a limiting block 213.

When the upper abutting block 41 is inserted into the first sliding groove 421, the limiting block 213 can be inserted into the limiting groove 411 to limit the upper abutting block 41, so that the upper abutting block 41 is not easy to move out of the first sliding groove 421, and the connection stability between the fixed mold bottom plate 21 and the movable mold frame 12 is further improved after mold assembly.

Referring to fig. 6, a thermal expansion member 214 is disposed in the second chute 212, and the thermal expansion member 214 is connected to the limiting block 213 and located at a side of the limiting block 213 near the fixed mold core 22. In this embodiment, the thermal expansion member 214 is made of a phase change material, so that the thermal expansion member 214 can absorb the excessive heat in the injection molding process, and release the stored heat during the cooling stage of the mold, thereby helping to cool the mold more uniformly, and slowing down the switching speed of the mold between high temperature and low temperature, so that the mold is not easy to cause material fatigue or crack due to thermal shock, and the service life of the mold is prolonged to a certain extent.

The implementation principle of the injection mold of embodiment 2 of the present application is that when injection molding material is injected into the cavity 23, the temperature in the cavity 23 increases, so that the thermal expansion member 214 expands when heated, so as to push the limiting block 213 to be inserted into the limiting slot 411, thereby helping to fix the fixed mold bottom plate 21 and the movable mold frame 12. And after the product in the cavity 23 is sufficiently cooled, the temperature is reduced, and the thermal expansion member 214 contracts to drive the limiting block 213 to separate from the limiting slot 411, so that the limiting block 213 does not limit the upper abutting block 41 any more, and the fixed die bottom plate 21 and the movable die carrier 12 are convenient to separate.

The above embodiments are not intended to limit the scope of the application, so that the equivalent changes of the structure, shape and principle of the application are covered by the scope of the application.

Claims

1. An injection mold, characterized in that it comprises:

A movable mold assembly (1), comprising a movable mold base plate (11), a movable mold frame (12) and a movable mold core (13), wherein the movable mold frame (12) is arranged on the movable mold base plate (11), the movable mold core (13) is embedded on a side of the movable mold frame (12) away from the movable mold base plate (11), the movable mold base plate (11) is provided with an injection port (111), the movable mold frame (12) is provided with a flow channel (121), the movable mold frame (12) is provided with a plurality of flow diversion ports (122), and the flow channel (121) is respectively connected to the injection port (111) and the plurality of flow diversion ports (122);

The fixed mold assembly (2) comprises a fixed mold base plate (21) and a fixed mold core (22) embedded in the fixed mold base plate (21), a mold cavity (23) is formed between the fixed mold core (22) and the movable mold core (13), and a plurality of diversion ports (122) are respectively connected to the mold cavity (23).

2. The injection mold according to claim 1, characterized in that a protection component (4) is provided between the fixed mold base plate (21) and the movable mold frame (12), and the protection component (4) is used to reduce the impact between the fixed mold base plate (21) and the movable mold frame (12).

3. The injection mold according to claim 2, characterized in that: the protection component (4) comprises an upper abutment block (41), a connecting seat (42), a lower abutment block (43) and an elastic member (44), the upper abutment block (41) is arranged on the side wall of the movable mold frame (12), the connecting seat (42) is arranged on the fixed mold bottom plate (21) and is arranged opposite to the upper abutment block (41), the connecting seat (42) is provided with a first slide groove (421), the lower abutment block (43) is slidably inserted in the first slide groove (421), the elastic member (44) is arranged in the first slide groove (421) and is connected to the lower abutment block (43), when the fixed mold bottom plate (21) and the movable mold frame (12) are close to each other, the upper abutment block (41) is inserted in the first slide groove (421).

4. The injection mold according to claim 3 is characterized in that: a limiting groove (411) is provided on the upper abutment block (41), a second slide groove (212) is provided on the fixed mold bottom plate (21) in the horizontal direction, the second slide groove (212) is connected to the first slide groove (421), a limiting block (213) is slidably inserted in the second slide groove (212), and the limiting block (213) can be inserted in the limiting groove (411).

5. The injection mold according to claim 4, characterized in that a heat expansion component (214) is arranged in the second slide groove (212), and the heat expansion component (214) is connected to the limit block (213) and is located on a side of the limit block (213) close to the cavity (23).

6. The injection mold according to claim 5, characterized in that the thermal expansion member (214) is made of phase change material.

7. The injection mold according to claim 2, characterized in that: a plurality of the protection components (4) are provided, and the plurality of the protection components (4) are evenly distributed along the circumference of the fixed mold bottom plate (21).

8. The injection mold according to claim 1, characterized in that: positioning columns (211) are provided at four vertex positions of the fixed mold base plate (21), and positioning grooves (123) are opened on the movable mold frame (12), the number of the positioning grooves (123) is equal to the number of the positioning columns (211), and one positioning column (211) is inserted in one positioning groove (123).

9. The injection mold according to claim 1, characterized in that: an ejector assembly (3) is provided on a side of the fixed mold bottom plate (21) facing away from the fixed mold core (22), and the ejector assembly (3) is used to push the product out of the mold cavity (23).

10. The injection mold according to claim 9, characterized in that: the ejector assembly (3) comprises an ejector plate (31) and a plurality of ejector pins (32) arranged on the ejector plate (31), the ejector plate (31) is slidably connected to the fixed mold bottom plate (21), the ejector pins (32) penetrate the fixed mold bottom plate (21) and correspond to the cavity (23), and the ejector plate (31) is used to drive the ejector pins (32) to move.