Injection mold for producing shell

Abstract

The utility model relates to the technical field of injection molding tools, and provides an injection mold for producing a shell, which comprises a fixed mold assembly, a movable mold assembly, a first ejection assembly, a second ejection assembly and a mold drawing assembly, a first molded surface of an inner cavity of a molded shell is arranged on the fixed mold assembly, a second molded surface of the outer surface of the molded shell is arranged on the movable mold assembly, and the mold drawing assembly is arranged on the movable mold assembly. And the feeding hole is formed in the middle position of the first molded surface. Compared with the prior art, the injection mold has the advantages that the first molded surface of the inner cavity of the molding shell is arranged on the fixed mold assembly, and the second molded surface of the outer surface of the molding shell is arranged on the movable mold assembly, so that residues at a feeding hole in the shell are arranged in the inner cavity of the shell, and the surface smoothness of the outer surface of the shell is ensured; and the design and production of the shell can meet the requirements of customers.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding tools, in particular to an injection molding die for producing a shell. Background Art

[0002] Injection molds are tools used in the plastic processing industry to match plastic molding machines and give plastic products complete configurations and precise dimensions. Due to the wide variety of plastics and processing methods, and the varying structures of plastic molding machines and plastic products, there are also many types and structures of injection molds.

[0003] like Figure 1 The shell shown is also produced by an injection mold. When designing a traditional injection mold, the surface of the outer surface 33 of the molded shell is usually set on the fixed mold part, and the surface of the inner cavity 34 of the molded shell is set on the movable mold part. Since the feed port of the injection mold is between the fixed mold components, the shell produced in this way will have feed residue on the outer surface 33 of the shell. Such a design cannot meet the needs of customers who have requirements for the smoothness of the shell appearance. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an injection mold for producing a shell in view of the current status of the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: an injection mold for producing a shell is proposed, the shell has a relative outer surface and an inner cavity, a plurality of plug holes are arranged on the outer surface, and the outer side wall of the plug hole has a connecting column, and the injection mold includes:

[0006] A fixed mold assembly having a first molding surface for molding the inner cavity;

[0007] A movable mold assembly, which is movably matched with the fixed mold assembly, the movable mold assembly has a second molding surface for molding the outer surface, the first molding surface and the second molding surface are arranged opposite to each other and form a product cavity when the fixed mold assembly and the movable mold assembly abut against each other;

[0008] A feed hole, which is arranged on the fixed mold assembly, one end of which is arranged at the middle position of the first molding surface and communicates with the product molding cavity;

[0009] A first ejector assembly, which is movably arranged on the fixed mold assembly, and the first ejector assembly has a plurality of ejector rods whose ends are movably inserted into the product cavity;

[0010] A second ejector assembly is movably arranged on the movable mold assembly, the second ejector assembly has at least two oppositely arranged forming rods, the two forming rods have forming grooves on opposite sides, the forming grooves are communicated with the product cavity and are used to form the connecting column, and the ends of the two forming rods facing the fixed mold assembly can be separated from each other when extending from the movable mold assembly, and can be close to each other when retracting into the movable mold assembly;

[0011] The die drawing assembly is arranged on the outside of the injection mold, and the die drawing assembly is used to drive the first ejection assembly to move on the fixed mold assembly.

[0012] In the above-mentioned injection mold for producing a housing, the second ejector assembly includes:

[0013] A first push plate, which is movably disposed in the movable mold assembly;

[0014] A first fixed plate, which is fixedly arranged on a side of the first push plate facing the fixed mold assembly;

[0015] A first fixing seat, one end of which is fixed on the first push plate, the other end of which passes through the first fixing plate, and a T-shaped slot is provided at one end of the first fixing seat away from the first push plate;

[0016] A rotating shaft is fixedly provided at one end of each forming rod away from the product cavity, and collars are sleeved at both ends of the rotating shaft along its own axial direction, and the collars are movably arranged in the T-slot.

[0017] In the above-mentioned injection mold for producing a shell, the movable mold assembly has at least two symmetrically arranged inclined grooves, the two inclined grooves are connected to each other at one end facing the second mold surface and penetrate the second mold surface, and the width of the part where the two inclined grooves are connected gradually increases along the direction from the second mold surface to the first mold surface.

[0018] In the above-mentioned injection mold for producing a shell, limiting surfaces are arranged on the two molding rods, a limiting portion is arranged between the two inclined grooves, and the limiting surfaces movably abut against the limiting portion.

[0019] In the above-mentioned injection mold for producing a housing, the die assembly comprises:

[0020] A locking block, the locking block being movably disposed on the first ejection assembly;

[0021] A locking rod, which is fixed on the movable mold assembly and movably connected to the locking block;

[0022] An unlocking rod is fixed to the fixed mold assembly and movably abuts against the locking block. The locking block can be engaged with the locking rod when the fixed mold assembly abuts against the movable mold assembly, and drive the first ejection assembly to move on the fixed mold assembly when the movable mold assembly is separated from the fixed mold assembly, and disengage from the locking rod when relative displacement occurs between the unlocking rod and the locking block.

[0023] In the above-mentioned injection mold for producing a housing, the die assembly further comprises:

[0024] A connecting block, one end of which is fixed to the first ejection assembly;

[0025] A second fixing seat connected to the other end of the connecting block, the second fixing seat having a guide groove perpendicular to the fixed mold assembly and pointing to the movable mold assembly, the locking block being movably arranged in the guide groove;

[0026] The first elastic member is arranged in the guide groove, and two ends of the first elastic member that are elastically deformed respectively abut against the side wall of the guide groove and the locking block.

[0027] In the above-mentioned injection mold for producing a shell, the locking block is provided with a through portion that penetrates the wall thickness of the locking block in a direction parallel to the direction from the movable mold assembly to the fixed mold assembly, and the unlocking rod extends outward to form a clamping portion, and the clamping portion passes through the through portion and is movably clamped with the end face of the locking block.

[0028] In the above-mentioned injection mold for producing a shell, a first inclined surface is provided on the side of the locking block facing the unlocking rod, and a second inclined surface is provided on the side of the unlocking rod facing the locking block, and the first inclined surface movably abuts against the second inclined surface.

[0029] In the above-mentioned injection mold for producing a housing, the first ejection assembly includes:

[0030] A second push plate, which is movably disposed in the fixed mold assembly, one end of which is exposed outside the fixed mold assembly and is fixedly connected to the connecting block;

[0031] A second fixed plate, which is fixedly connected to the second push plate, the push rod is clamped on the second fixed plate and the end of the push rod is tightly against the second push plate;

[0032] The second elastic member has one end that generates elastic deformation passing through the second push plate and pressed against the second fixed plate, and the other end of the second elastic member presses against the fixed mold assembly.

[0033] Compared with the prior art, the advantage of the utility model lies in that by setting the first molding surface of the inner cavity of the shell on the fixed mold assembly and the second molding surface of the outer surface of the shell on the movable mold assembly, the feed port on the shell is residually set in the inner cavity of the shell, thereby ensuring the surface smoothness of the outer surface of the shell, so that the design and production of the shell can meet the needs of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a stereogram of the shell;

[0035] Figure 2 It is a three-dimensional diagram of this scheme;

[0036] Figure 3 yes Figure 2 A partial cross-sectional view of

[0037] Figure 4 It is a three-dimensional diagram of the partial structure of the drawing die assembly;

[0038] Figure 5 It is a partial cross-sectional view of the fixed mold assembly;

[0039] Figure 6 It is a partial cross-sectional view of the structure of the movable mold assembly;

[0040] Figure 7 It is a partial cross-sectional view of the forming rod when it is installed on the first fixing seat.

[0041] In the figure, 1, fixed mold assembly; 2, movable mold assembly; 3, feed hole; 4, first ejector assembly; 5, ejector rod; 6, second ejector assembly; 7, forming rod; 8, forming groove; 9, drawing die assembly; 10, first push plate; 11, first fixed plate; 12, first fixed seat; 13, T-slot; 14, rotating shaft; 15, collar; 16, inclined groove; 17, limiting surface; 18, limiting part; 19, locking block; 20, locking rod; 21, unlocking rod; 22, connecting block; 23, second fixed seat; 24, guide groove; 25, first elastic member; 26, penetration part; 27, clamping part; 28, first inclined surface; 29, second inclined surface; 30, second push plate; 31, second fixed plate; 32, second elastic member; 33, outer surface; 34, inner chamber; 35, connecting column. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] like Figures 2 to 7As shown, the utility model is an injection mold for producing a shell, wherein the shell has a relative outer surface 33 and an inner cavity 34, a plurality of plug holes are arranged on the outer surface 33, and the outer side wall of the plug hole has a connecting column 35, and the injection mold comprises: a fixed mold component 1, which has a first mold surface for molding the inner cavity 34; a movable mold component 2, which is movably matched with the fixed mold component 1, and the movable mold component 2 has a second mold surface for molding the outer surface 33, the first mold surface and the second mold surface are arranged opposite to each other and form a product cavity when the fixed mold component 1 and the movable mold component 2 are abutted; a feed hole 3, which is arranged on the fixed mold component 1, and one end of the feed hole 3 is arranged in the middle position of the first mold surface and communicates with the product cavity ; A first ejector assembly 4 is movably arranged on the fixed mold assembly 1, and the first ejector assembly 4 has a plurality of ejector rods 5 whose ends are movably inserted into the product cavity; a second ejector assembly 6 is movably arranged on the movable mold assembly 2, and the second ejector assembly 6 has at least two relatively arranged forming rods 7, and the two forming rods 7 have forming grooves 8 on opposite sides, and the forming grooves 8 are connected to the product cavity and are used to form connecting columns 35, and the ends of the two forming rods 7 facing the fixed mold assembly 1 can be separated from each other when extending out of the movable mold assembly 2, and can be close to each other when retracting the movable mold assembly 2; a drawing mold assembly 9 is arranged on the outside of the injection mold, and the drawing mold assembly 9 is used to drive the first ejector assembly 4 to move on the fixed mold assembly 1.

[0044] During operation, the fixed mold assembly 1 and the movable mold assembly 2 are respectively fixed to the fixed part and the movable part of the plastic molding machine. The movable mold assembly 2 is driven by the movable part to move closer to or away from the fixed mold assembly 1 to realize the closing and opening actions of the injection mold. After the shell in the product cavity is initially cooled, the movable part of the plastic molding machine drives the movable mold assembly 2 to move in the direction away from the fixed mold assembly 1. At the same time, the drawing mold assembly 9 drives the first ejection assembly 4 to eject the shell adhered to the fixed mold assembly 1 from the fixed mold assembly 1. After the fixed mold assembly 1 and the movable mold assembly 2 are separated to a preset position, the second ejection assembly 6 drives the two molding rods 7 to extend out of the movable mold assembly 2. During the movement of the two molding rods 7, the ends thereof facing the fixed mold assembly 1 are separated from each other so that the connecting column 35 on the shell is exposed to the outside. Finally, the shell is taken out from the movable mold assembly 2.

[0045] In the present solution, by setting the first molding surface of the inner cavity 34 of the shell on the fixed mold assembly 1, and setting the second molding surface of the outer surface 33 of the shell on the movable mold assembly 2, the feed port 3 on the shell is left in the inner cavity 34 of the shell, thereby ensuring the surface finish of the outer surface 33 of the shell, so that the design and production of the shell can meet the needs of customers. Furthermore, by setting the first ejection assembly 4 on the fixed mold assembly 1, and by setting the drawing die assembly 9 to drive the first ejection assembly 4 to move, the ejection action of the shell is realized, and the normal demolding of the shell is ensured.

[0046] Furthermore, the second ejector assembly 6 includes: a first push plate 10, which is movably arranged in the movable mold assembly 2; a first fixed plate 11, which is fixed to the side of the first push plate 10 facing the fixed mold assembly 1; a first fixed seat 12, one end of which is fixed on the first push plate 10, the other end of the first fixed seat 12 passes through the first fixed plate 11, and the end of the first fixed seat 12 away from the first push plate 10 is provided with a T-slot 13; a rotating shaft 14, each forming rod 7 is fixed with a rotating shaft 14 at one end away from the product cavity, and the rotating shaft 14 is provided with a ring 15 at both ends along its own axial direction, and the ring 15 is movably arranged in the T-slot 13.

[0047] The first push plate 10 is driven by the ejection mechanism on the plastic molding machine. After the movable mold assembly 2 and the fixed mold assembly 1 are separated to complete the mold opening action, the ejection mechanism on the plastic molding machine drives the first push plate 10 to move toward the fixed mold assembly 1. When the first push plate 10 moves, it pushes the first fixed seat 12 to move. When the first fixed seat 12 moves, it drives the two molding rods 7 to extend out of the movable mold assembly 2. The setting of the rotating shaft 14, the collar 15 and the T-slot 13 is used to enable the end of the molding rod 7 away from the fixed mold assembly 1 to be displaced a certain distance during the movement of the molding rod 7, so as to prevent the molding rod 7 from being stuck in the movable mold assembly 2.

[0048] Furthermore, the movable mold assembly 2 has at least two symmetrically arranged inclined grooves 16, and the two inclined grooves 16 are connected to each other at one end facing the second mold surface and penetrate the second mold surface. The width of the connected portion of the two inclined grooves 16 gradually increases along the direction from the second mold surface to the first mold surface, so that when the second ejection assembly 6 drives the two forming rods 7 to move, the ends of the two forming rods 7 close to the fixed mold assembly 1 can be separated from each other.

[0049] Furthermore, a limiting surface 17 is disposed on each of the two forming rods 7 , and a limiting portion 18 is disposed between the two inclined grooves 16 , and the limiting surface 17 and the limiting portion 18 are movably abutted against each other.

[0050] When the ejection mechanism on the plastic molding machine drives the second ejection assembly 6 to reset, the limiting surface 17 on the molding rod 7 abuts against the limiting portion 18 to enable the two molding rods 7 to reset to the correct position.

[0051] Furthermore, the drawing die assembly 9 includes: a locking block 19, which is movably arranged on the first ejection assembly 4; a locking rod 20, which is fixedly arranged on the movable die assembly 2 and movably engaged with the locking block 19; an unlocking rod 21, which is fixedly arranged on the fixed die assembly 1 and movably abuts against the locking block 19. The locking block 19 can be engaged with the locking rod 20 when the fixed die assembly 1 and the movable die assembly 2 abut, and drive the first ejection assembly 4 to move on the fixed die assembly 1 when the movable die assembly 2 is separated from the fixed die assembly 1, and disengage from the locking rod 20 when relative displacement occurs between the unlocking rod 21 and the locking block 19.

[0052] like Figure 3 As shown, at this time, the injection mold is in a mold closing state, and the locking rod 20 and the locking block 19 are engaged with each other. When the injection mold just begins to open the mold, since the locking rod 20 and the locking block 19 are engaged with each other, the movable mold assembly 2 can drive the first ejector assembly 4 to move relative to the fixed mold assembly 1 toward the direction close to the movable mold assembly 2. When the first ejector assembly 4 moves to the unlocking rod 21, the locking block 19 is pushed along the Figure 3 When the first ejection assembly 4 is moved in the left-right direction to separate from the locking block 19, the first ejection assembly 4 is released and the housing is completely separated from the fixed mold assembly 1.

[0053] Furthermore, the die assembly 9 also includes: a connecting block 22, one end of which is fixed on the first ejection assembly 4; a second fixed seat 23, which is connected to the other end of the connecting block 22, and the second fixed seat 23 has a guide groove 24 along a direction perpendicular to the fixed mold assembly 1 pointing to the movable mold assembly 2, and the locking block 19 is movably arranged in the guide groove 24; a first elastic member 25, which is arranged in the guide groove 24 and the two ends of the first elastic member 25 that produce elastic deformation respectively abut against the side walls of the guide groove 24 and the locking block 19.

[0054] The connecting block 22 connects the locking block 19 to the first ejection assembly 4 through the second fixing seat 23. The guide groove 24 is used to provide guidance for the movement of the locking block 19. When the unlocking rod 21 pushes the locking block 19 to move in the guide groove 24, the first elastic member 25 is slowly in a compressed state. After the locking block 19 is disengaged from the unlocking rod 21 and the first ejection assembly 4 is reset, the first elastic member 25 resumes the extended state and drives the locking block 19 to reset.

[0055] Furthermore, the locking block 19 is provided with a through portion 26 which penetrates the wall thickness of the locking block 19 in a direction parallel to the movable mold assembly 2 and pointing to the fixed mold assembly 1. A clamping portion 27 is formed on the unlocking rod 21 extending outward. The clamping portion 27 passes through the through portion 26 and is movably clamped with the end face of the locking block 19, so as to realize the clamping connection between the locking block 19 and the unlocking rod.

[0056] Furthermore, a first inclined surface 28 is provided on the side of the locking block 19 facing the unlocking rod 21, and a second inclined surface 29 is provided on the side of the unlocking rod 21 facing the locking block 19. The first inclined surface 28 and the second inclined surface 29 are movably abutted against each other. The setting of the first inclined surface 28 and the second inclined surface 29 is used to enable the unlocking rod 21 to push the locking block 19 to move in the guide groove 24 when the first ejection assembly 4 drives the locking block 19 to move toward the direction close to the movable mold assembly 2, so that the locking block 19 and the unlocking rod can be disengaged.

[0057] Furthermore, the first ejector assembly 4 includes: a second push plate 30, which is movably arranged in the fixed mold assembly 1, one end of the second push plate 30 is exposed to the outside of the fixed mold assembly 1 and is fixedly connected to the connecting block 22; a second fixed plate 31, which is fixedly connected to the second push plate 30, the ejector rod 5 is clamped on the second fixed plate 31 and the end of the ejector rod 5 is tightly pressed against the second push plate 30; a second elastic member 32, one end of which generates elastic deformation passes through the second push plate 30 and is pressed against the second fixed plate 31, and the other end of the second elastic member 32 is pressed against the fixed mold assembly 1.

[0058] The second push plate 30 is fixedly connected to the connecting block 22 for connecting the drawing die assembly 9, so that when the movable die assembly 2 begins to separate from the fixed die assembly 1, the second push plate 30 is driven to push the ejector rod 5 to eject the shell on the fixed die assembly 1. The second elastic member 32 is used to reset the first ejection assembly 4 after the movable die assembly 2 is separated from the fixed die assembly 1.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0060] In addition, in the present invention, the descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the scope defined by the spirit of the present invention.

Claims

1. An injection mold for producing a shell, the shell having a relative outer surface and an inner cavity, the outer surface is provided with a plurality of plug holes, the outer side walls of the plug holes have connecting columns, characterized in that: The injection mold comprises: A fixed mold assembly having a first molding surface for molding the inner cavity; A movable mold assembly, which is movably matched with the fixed mold assembly, the movable mold assembly has a second molding surface for molding the outer surface, the first molding surface and the second molding surface are arranged opposite to each other and form a product cavity when the fixed mold assembly and the movable mold assembly abut against each other; A feed hole, which is arranged on the fixed mold assembly, one end of which is arranged at the middle position of the first molding surface and communicates with the product molding cavity; A first ejector assembly, which is movably arranged on the fixed mold assembly, and the first ejector assembly has a plurality of ejector rods whose ends are movably inserted into the product cavity; A second ejector assembly is movably arranged on the movable mold assembly, the second ejector assembly has at least two oppositely arranged forming rods, the two forming rods have forming grooves on opposite sides, the forming grooves are communicated with the product cavity and are used to form the connecting column, and the ends of the two forming rods facing the fixed mold assembly can be separated from each other when extending from the movable mold assembly, and can be close to each other when retracting into the movable mold assembly; The die drawing assembly is arranged on the outside of the injection mold, and the die drawing assembly is used to drive the first ejection assembly to move on the fixed mold assembly.

2. An injection mold for producing a housing as claimed in claim 1, characterized in that: The second ejection assembly comprises: A first push plate, which is movably disposed in the movable mold assembly; A first fixed plate, which is fixedly arranged on a side of the first push plate facing the fixed mold assembly; A first fixing seat, one end of which is fixed on the first push plate, the other end of which passes through the first fixing plate, and a T-shaped slot is provided at one end of the first fixing seat away from the first push plate; A rotating shaft is fixedly provided at one end of each forming rod away from the product cavity, and collars are sleeved at both ends of the rotating shaft along its own axial direction, and the collars are movably arranged in the T-slot.

3. An injection mold for producing a housing as claimed in claim 1, characterized in that: The movable mold assembly has at least two symmetrically arranged inclined grooves, the two inclined grooves are connected to each other at one end facing the second mold surface and penetrate the second mold surface, and the width of the connected part of the two inclined grooves gradually increases along the direction from the second mold surface to the first mold surface.

4. An injection mold for producing a housing as claimed in claim 3, characterized in that: A limiting surface is arranged on each of the two forming rods, a limiting portion is arranged between the two inclined grooves, and the limiting surface movably abuts against the limiting portion.

5. An injection mold for producing a housing as claimed in claim 1, characterized in that: The die assembly comprises: A locking block, the locking block being movably disposed on the first ejection assembly; A locking rod, which is fixed on the movable mold assembly and movably connected to the locking block; An unlocking rod is fixed to the fixed mold assembly and movably abuts against the locking block. The locking block can be engaged with the locking rod when the fixed mold assembly abuts against the movable mold assembly, and drive the first ejection assembly to move on the fixed mold assembly when the movable mold assembly is separated from the fixed mold assembly, and disengage from the locking rod when relative displacement occurs between the unlocking rod and the locking block.

6. An injection mold for producing a housing as claimed in claim 5, characterized in that: The die assembly further comprises: A connecting block, one end of which is fixed to the first ejection assembly; A second fixing seat connected to the other end of the connecting block, the second fixing seat having a guide groove perpendicular to the fixed mold assembly and pointing to the movable mold assembly, the locking block being movably arranged in the guide groove; The first elastic member is arranged in the guide groove, and two ends of the first elastic member that are elastically deformed respectively abut against the side wall of the guide groove and the locking block.

7. An injection mold for producing a housing as claimed in claim 5, characterized in that: The locking block is provided with a through portion which penetrates the wall thickness of the locking block in a direction parallel to the direction from the movable mold assembly to the fixed mold assembly, and the unlocking rod extends outward to form a clamping portion which passes through the through portion and is movably clamped with the end face of the locking block.

8. An injection mold for producing a housing as claimed in claim 5, characterized in that: A first inclined surface is arranged on a side of the locking block facing the unlocking rod, and a second inclined surface is arranged on a side of the unlocking rod facing the locking block, and the first inclined surface movably abuts against the second inclined surface.

9. An injection mold for producing a housing as claimed in claim 6, characterized in that: The first ejection assembly comprises: A second push plate, which is movably disposed in the fixed mold assembly, one end of which is exposed outside the fixed mold assembly and is fixedly connected to the connecting block; A second fixed plate, which is fixedly connected to the second push plate, the push rod is clamped on the second fixed plate and the end of the push rod is tightly against the second push plate; The second elastic member has one end that generates elastic deformation passing through the second push plate and pressed against the second fixed plate, and the other end of the second elastic member presses against the fixed mold assembly.

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