CN218227713U

CN218227713U - Thimble and push plate composite demoulding structure applied to injection mould

Info

Publication number: CN218227713U
Application number: CN202222261423.1U
Authority: CN
Inventors: 刘树
Original assignee: Dongguan Guanglian Plastic Mold Products Co ltd
Current assignee: Dongguan Guanglian Plastic Mold Products Co ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-01-06
Anticipated expiration: 2032-08-26

Abstract

The utility model discloses an ejector pin and push plate composite demoulding structure applied to an injection mould, which comprises an upper mould component and a lower mould component, wherein the upper mould component comprises an upper mould seat plate, an upper mould plate and an upper mould forming insert; the lower die forming insert is provided with a demoulding push plate, the lower end side of the ejector plate group is provided with a linkage plate group, and the linkage plate group is provided with a push plate push rod which is in threaded connection with the demoulding push plate; a linkage plate through hole is formed in the middle of the linkage plate group, and a top block extending into the linkage plate through hole is screwed on the top plate; the linkage recess is seted up to the kicking block, and horizontal moving part, elastic component are installed to the link plate group, and lower die base plate spiral shell dress fastening fixed dog, the inclined plane contact of the dog wedge portion of fixed dog supports the inclined plane of the moving part wedge portion of pressing horizontal moving part. The utility model has the advantages of structural design is novel, drawing of patterns reliable and stable nature is good.

Description

Thimble and push plate composite demoulding structure applied to injection mould

Technical Field

The utility model relates to an injection mold technical field especially relates to a be applied to injection mold's thimble, compound demoulding structure of push pedal.

Background

Injection molding, also known as injection molding, is a molding method that is injection and molding; the injection molding method has the advantages of high production speed, high efficiency, automation of operation, various designs and colors, various shapes from simple to complex, small sizes, accurate product size, easy replacement of products, capability of forming products with complex shapes, and suitability for the molding processing fields of mass production, products with complex shapes and the like. Wherein, the injection molding of plastic part needs to be realized through injection mold.

For the injection mold, the injection mold comprises an upper mold component and a lower mold component matched with the upper mold component, wherein the upper mold component comprises an upper mold base plate, an upper mold plate spirally mounted on the lower surface of the upper mold base plate, and an upper mold forming insert spirally mounted in the middle position of the upper mold plate, the lower mold component comprises a lower mold base plate, a lower mold plate positioned on the upper end side of the lower mold base plate, and a lower mold forming insert mounted on the lower mold plate, two lower mold cushion blocks are mounted between the lower mold base plate and the lower mold plate, the lower mold cushion blocks and the lower mold base plate are sequentially and spirally connected from top to bottom, an ejector pin plate group is mounted between the two lower mold cushion blocks, the ejector pin plate group comprises an ejector pin panel and an ejector pin bottom plate which is spirally mounted on the lower surface of the ejector pin panel, and demolding ejector pins are clamped between the ejector pin panel and the ejector pin bottom plate. In the process that the injection mold performs demolding after the injection molding of the plastic product is finished, the ejector pin plate group drives the demolding ejector pins to move upwards and eject the plastic product upwards, and demolding is completed.

It should be noted that, for the injection mold, for a porous plastic product with more molding holes, because there are more molding holes, when the plastic product is ejected out of the lower mold molding insert through the demolding thimble, the wrapping force of the plastic product on the lower mold molding insert is large, at this time, the pushing action force of the demolding thimble on the plastic product is large, and the large reaction force of the plastic product can deform the demolding thimble, thereby affecting the stability and reliability of the injection mold; in addition, the demoulding thimble can damage the plastic product due to larger acting force on the plastic product.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a be applied to injection mold's thimble, the compound demoulding structure of push pedal to prior art not enough, this be applied to injection mold's thimble, the compound demoulding structure of push pedal novel in design, drawing of patterns reliable and stable nature good.

In order to achieve the above purpose, the present invention is achieved by the following technical solutions.

A thimble and push plate composite demoulding structure applied to an injection mould comprises an upper mould component and a lower mould component, wherein the upper mould component comprises an upper mould seat plate, an upper mould plate and an upper mould forming insert;

the lower die forming insert is provided with a demoulding push plate, a linkage plate group positioned on the lower end side of the thimble plate group is arranged between the two lower die cushion blocks, and the linkage plate group is provided with a push plate push rod which sequentially penetrates through the thimble base plate, the thimble panel, the lower die plate and the lower die forming insert from bottom to top and is in threaded connection with the demoulding push plate;

a linkage plate through hole which is completely penetrated up and down is formed in the middle of the linkage plate group, and an ejector block which extends into the linkage plate through hole of the linkage plate group and is driven by an ejection mechanism of the injection molding machine is screwed on the ejector pin bottom plate; the top block is provided with a linkage groove, the linkage plate is assembled with a horizontal moving part and an elastic part for promoting the horizontal moving part to move outwards, the lower die base plate is screwed and fixedly provided with a fixed stop dog positioned at the outer end side of the horizontal moving part, the upper end part of the fixed stop dog is a wedge-shaped stop dog part, the outer end part of the horizontal moving part is a wedge-shaped moving part wedge part, and the inclined surface of the stop dog wedge part is contacted with and pressed against the inclined surface of the moving part wedge part; when the injection mold is in a mold closing state, the upper mold forming insert, the lower mold forming insert and the demolding push plate jointly form an injection molding cavity, and the inner end part of the horizontal moving part is embedded into the linkage groove of the ejector block.

The linkage plate group comprises a linkage panel and a linkage bottom plate which is screwed on the lower surface of the linkage panel, the lower end part of the push plate push rod is clamped and fixed between the linkage panel and the linkage bottom plate, and the linkage plate through hole penetrates through the linkage panel and the linkage bottom plate from top to bottom in sequence.

A moving part mounting groove communicated with the linkage plate through hole is formed between the linkage panel and the linkage bottom plate, and the horizontal moving part is embedded in the moving part mounting groove;

the linkage bottom plate is provided with a bottom plate through hole which is opened downwards and communicated with the moving part mounting groove, and the wedge-shaped part of the stop block of the fixed stop block extends into the bottom plate through hole.

The elastic piece is a compression spring which is horizontally arranged, the outer end of the compression spring is abutted with the horizontal moving piece, and the inner end of the compression spring is abutted with the linkage plate group.

Wherein, the upper surface of the thimble panel is screwed with a thimble plate stop block.

The ejector pin plate group is provided with an ejector pin plate through hole which sequentially penetrates through the ejector pin panel and the ejector pin plate bottom plate from top to bottom, and the upper end of the linkage plate check block penetrates through the ejector pin plate through hole and extends to the upper end side of the ejector pin panel.

The ejector pin plate is provided with an ejector pin panel and an ejector pin bottom plate, the ejector pin bottom plate is provided with a linkage plate, the linkage plate is provided with a lower guide sleeve, and the upper guide sleeve and the lower guide sleeve are respectively sleeved on the guide pillars.

And a return spring is arranged between the lower template and the ejector pin plate group, the upper end of the return spring is abutted against the lower template, and the lower end of the return spring is abutted against the ejector pin plate group.

The lower template is provided with a spring positioning hole with a downward opening corresponding to the return spring, the upper end of the return spring is embedded into the spring positioning hole of the lower template, and the lower end of the return spring is abutted against the upper surface of the ejector pin panel.

The beneficial effects of the utility model are that: the utility model discloses an ejector pin and push pedal composite demoulding structure applied to an injection mould, which comprises an upper mould component and a lower mould component, wherein the upper mould component comprises an upper mould seat plate, an upper mould plate and an upper mould forming insert; the lower die forming insert is provided with a demoulding push plate, the lower end side of the ejector plate group is provided with a linkage plate group, and the linkage plate group is provided with a push plate push rod in threaded connection with the demoulding push plate; a linkage plate through hole is formed in the middle of the linkage plate group, and a top block extending into the linkage plate through hole is screwed on the top pin bottom plate; the top block is provided with a linkage groove, the linkage plate assembly is provided with a horizontal moving part and an elastic part, the lower die base plate is screwed and fixedly provided with a fixed stop dog, the upper end part of the fixed stop dog is a stop dog wedge-shaped part, the outer end part of the horizontal moving part is a moving part wedge-shaped part, and the inclined surface of the stop dog wedge-shaped part is contacted with and pressed against the inclined surface of the moving part wedge-shaped part; when the injection mold is in a mold closing state, the upper mold forming insert, the lower mold forming insert and the demolding push plate jointly form an injection molding cavity, and the inner end part of the horizontal moving part is embedded into the linkage groove of the ejector block. Through the structure design, the utility model has the advantages of structural design is novel, drawing of patterns reliable and stable nature is good.

Drawings

The invention will be further described with reference to the drawings, but the embodiments in the drawings do not constitute any limitation of the invention.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged schematic view of fig. 1.

Included in fig. 1 and 2 are:

1-upper die assembly 11-upper die base plate

12-upper template 13-upper die forming insert

2-lower die assembly 21-lower die base plate

22-lower template 23-lower die forming insert

24-lower die cushion block 25-spring positioning hole

3-thimble plate group 31-thimble panel

32-thimble bottom plate 33-demoulding thimble

34-thimble stop 41-demoulding push plate

42-push plate push rod 5-linkage plate group

51-linkage plate through hole 52-linkage panel

53-linkage bottom plate 54-movable piece mounting groove

55-bottom plate through hole 56-linkage plate stop block

6-top block 61-linkage groove

71-horizontal moving part 711-moving part wedge part

72-fixed stop 721-stop wedge

81-guide post 821-upper guide sleeve

822-lower guide sleeve 9-return spring.

Detailed Description

The present invention will be described with reference to specific embodiments.

As shown in fig. 1 and fig. 2, an ejector pin and ejector plate composite demoulding structure applied to an injection mould comprises an upper mould component 1 and a lower mould component 2, wherein the upper mould component 1 comprises an upper mould seat plate 11, an upper mould plate 12 and an upper mould forming insert 13, the lower mould component 2 comprises a lower mould seat plate 21, a lower mould plate 22, a lower mould forming insert 23, two lower mould cushion blocks 24 and an ejector pin plate group 3 positioned between the two lower mould cushion blocks 24, the ejector pin plate group 3 comprises an ejector pin panel 31 and an ejector pin bottom plate 32 screwed on the lower surface of the ejector pin panel 31, and a demoulding ejector pin 33 is clamped between the ejector pin panel 31 and the ejector pin bottom plate 32.

The lower mold forming insert 23 is provided with a demolding push plate 41, the linkage plate group 5 located at the lower end side of the ejector pin plate group 3 is arranged between the two lower mold cushion blocks 24, and the linkage plate group 5 is provided with a push plate push rod 42 which sequentially penetrates through the ejector pin base plate 32, the ejector pin panel 31, the lower mold plate 22 and the lower mold forming insert 23 from bottom to top and is in threaded connection with the demolding push plate 41.

Furthermore, a linkage plate through hole 51 which completely penetrates up and down is formed in the middle of the linkage plate group 5, and an ejector block 6 which extends into the linkage plate through hole 51 of the linkage plate group 5 and is driven by an ejection mechanism of the injection molding machine is screwed on the ejector pin bottom plate 32; the top block 6 is provided with a linkage groove 61, the linkage plate group 5 is provided with a horizontal moving part 71 and an elastic part for promoting the horizontal moving part 71 to move outwards, the lower die base plate 21 is fixedly screwed with a fixed stop dog 72 positioned at the outer end side of the horizontal moving part 71, the upper end part of the fixed stop dog 72 is a wedge-shaped stop dog wedge part 721, the outer end part of the horizontal moving part 71 is a wedge-shaped moving part wedge part 711, and the inclined surface of the stop dog wedge part 721 is contacted with and pressed against the inclined surface of the wedge-shaped moving part 711; when the injection mold is in a mold closing state, the upper mold forming insert 13, the lower mold forming insert 23 and the demolding push plate 41 jointly form an injection molding cavity, and the inner end part of the horizontal movable piece 71 is embedded into the linkage groove 61 of the top block 6.

The following describes the present invention in detail with reference to a specific demolding operation, specifically:

step 1, after the plastic product is injection molded, separating an upper die assembly 1 from a lower die assembly 2;

step 2, after the upper die assembly 1 and the lower die assembly 2 are separated from each other and are in place, an ejection mechanism of the injection molding machine acts and pushes the ejector pad 6 upwards to drive the ejector pad 6 to move upwards, in the process, the ejector pad 6 can drive the ejector pin plate group 3 and the demolding ejector pins 33 to synchronously move upwards, when the linkage plate group 5 is in an initial position, the inner end part of the horizontal moving piece 71 is inserted into the linkage groove 61 of the ejector pad 6, the stopper wedge part 721 of the fixed stopper 72 abuts against the horizontal moving piece 71 and prevents the horizontal moving piece 71 from moving outwards, due to the limiting effect between the horizontal moving piece 71 and the linkage groove 61 of the ejector pad 6, in the process that the ejector pad 6 moves upwards, the ejector pad 6 drives the linkage plate group 5 to synchronously move upwards through the horizontal moving piece 71, the upward moving linkage plate group 5 drives the ejector pin push rod 42 and the demolding push plate 41 to synchronously move upwards, and the plastic product can be separated from the molding surface of the lower die-molding insert 23 under the pushing effect of the demolding ejector pins 33 and the demolding push plate 41;

step 3, in the process that the linkage plate group 5 moves upwards synchronously along with the ejector block 6, due to the elastic pushing acting force of the elastic piece, the horizontal moving piece 71 gradually moves outwards and gradually retreats from the linkage groove 61 of the ejector block 6, and in the process, the moving piece wedge part 711 of the horizontal moving piece 71 keeps in abutting contact with the stopper wedge part 721 of the fixed stopper 72; when the horizontal moving piece 71 moves outwards and completely retreats from the linkage groove 61 of the top block 6, the limiting function between the horizontal moving piece 71 and the linkage groove 61 is released, and at the moment, the linkage plate group 5, the push plate push rod 42 and the movable push plate cannot continuously move upwards;

and 4, in the process that the linkage plate group 5 stops moving upwards and the ejector block 6 continues moving upwards under the driving action of the ejection mechanism of the injection molding machine, the ejector pin group 3 and the demolding ejector pin 33 continue moving upwards, and under the pushing action of the demolding ejector pin 33, the plastic product is separated from the molding surface of the movable push plate and is subjected to complete demolding action.

It should be noted that, in the first stage of demolding, the demolding push plate 41 and the demolding thimble 33 are matched and separate the plastic product from the molding surface of the lower mold molding insert 23, so that the holding force between the plastic product and the lower mold molding insert 23 can be effectively reduced; in the second stage of demoulding, the demoulding thimble 33 moves upwards relative to the demoulding push plate 41 and completely ejects the plastic product, because the holding force between the plastic product and the injection mould is reduced in the first stage of demoulding, the demoulding thimble 33 can eject the plastic product and complete demoulding without large pushing force, thus effectively avoiding the problems that the demoulding thimble 33 deforms and the plastic product is damaged due to large holding force.

Synthesize the above-mentioned condition and know, through above-mentioned structural design, the utility model has the advantages of structural design is novel, drawing of patterns reliable and stable nature is good.

As shown in fig. 1 and 2, the linkage plate group 5 preferably includes a linkage panel 52 and a linkage bottom plate 53 screwed to a lower surface of the linkage panel 52, a lower end portion of the push rod 42 is clamped and fixed between the linkage panel 52 and the linkage bottom plate 53, and the linkage plate through hole 51 sequentially penetrates through the linkage panel 52 and the linkage bottom plate 53 from top to bottom.

As shown in fig. 1 and 2, a movable member mounting groove 54 communicating with the linkage plate through hole 51 is formed between the linkage panel 52 and the linkage base plate 53, and a horizontal movable member 71 is fitted in the movable member mounting groove 54.

In addition, the interlocking base plate 53 is provided with a base plate through hole 55 which is open downward and communicates with the movable member mounting groove 54, and a stopper wedge portion 721 of the fixed stopper 72 extends into the base plate through hole 55.

The linkage plate group 5 of the present invention is provided with a moving member mounting groove 54 between the linkage panel 52 and the linkage bottom plate 53, so as to mount the horizontal moving member 71 in the moving member mounting groove 54; the stopper wedge portion 721 of the fixed stopper 72 extends into the bottom plate through hole 55 of the linkage bottom plate 53, so that the inclined surface of the stopper wedge portion 721 of the fixed stopper 72 is in abutting contact with the inclined surface of the movable member wedge portion 711 of the horizontal movable member 71; the installation mode of the horizontal movable piece 71 can make the whole injection mold more compact.

As a preferred embodiment, as shown in fig. 1, the elastic member is a compression spring, the compression spring is horizontally disposed, an outer end portion of the compression spring abuts against the horizontal movable member 71, and an inner end portion of the compression spring abuts against the link plate group 5.

As a preferred embodiment, as shown in fig. 1, an ejector pin plate stopper is screwed tightly to the upper surface of the ejector pin plate 31.

The utility model discloses carry out the in-process of drawing of patterns action, when thimble board dog moved up and supported and lean on in the lower surface of lower bolster 22, then show that thimble board group 3 shifts up and puts in place under the driving action of kicking block 6, drawing of patterns thimble 33 drawing of patterns stroke finishes this moment.

As a preferred embodiment, the linkage plate group 5 is screwed with a linkage plate stopper 56 extending vertically upward, the ejector pin plate group 3 is provided with an ejector pin plate through hole which sequentially penetrates through the ejector pin panel 31 and the ejector pin base plate 32 from top to bottom, and an upper end portion of the linkage plate stopper 56 penetrates through the ejector pin plate through hole and extends to an upper end side of the ejector pin panel 31.

The utility model discloses carry out the in-process of drawing of patterns action, when linkage plate dog 56 moved up and leaned on in the lower surface of lower bolster 22, then show linkage plate group 5 and go up to move in place, under linkage plate dog 56's the effect of blockking, linkage plate group 5 stops to move up.

As a preferred embodiment, as shown in fig. 1, the lower mold base plate is provided with a guide post 81 arranged vertically, the ejector pin plate group 3 is provided with an upper guide sleeve 821 clamped between the ejector pin panel 31 and the ejector pin base plate 32, the linkage plate group 5 is provided with a lower guide sleeve 822, and the upper guide sleeve 821 and the lower guide sleeve 822 are respectively sleeved on the guide post 81.

In the process of opening or closing the mold, the top guide sleeve 821 and the guide post 81 are matched to form a guide pair structure, so that the top needle plate group 3 can be ensured to accurately move up and down; similarly, the guide pair structure formed by the lower guide sleeve 822 and the guide post 81 can ensure that the linkage plate group 5 moves up and down accurately.

As shown in fig. 1, in a preferred embodiment, a return spring 9 is provided between the lower platen 22 and the ejector pin group 3, an upper end of the return spring 9 abuts against the lower platen 22, and a lower end of the return spring 9 abuts against the ejector pin group 3.

Further, the lower die plate 22 is provided with a spring positioning hole 25 opening downward corresponding to the return spring 9, the upper end portion of the return spring 9 is fitted into the spring positioning hole 25 of the lower die plate 22, and the lower end portion of the return spring 9 abuts against the upper surface of the ejector pin panel 31.

In the process of return movement of the ejection mechanism of the injection molding machine, the return spring 9 acts on the return elastic force to return the ejector pin plate group 3, and finally the ejector pin plate group 3 and the linkage plate group 5 are returned to the initial positions.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A thimble and push plate composite demoulding structure applied to an injection mould comprises an upper mould component (1) and a lower mould component (2), wherein the upper mould component (1) comprises an upper mould base plate (11), an upper mould plate (12) and an upper mould forming insert (13), the lower mould component (2) comprises a lower mould base plate (21), a lower mould plate (22), a lower mould forming insert (23), two lower mould cushion blocks (24) and an ejector pin plate group (3) positioned between the two lower mould cushion blocks (24), the ejector pin plate group (3) comprises an ejector pin panel (31) and an ejector pin bottom plate (32) screwed on the lower surface of the ejector pin panel (31), and a demoulding thimble (33) is clamped between the ejector pin panel (31) and the ejector pin bottom plate (32);

the method is characterized in that: the lower die forming insert (23) is provided with a demoulding push plate (41), a linkage plate set (5) positioned on the lower end side of the ejector pin plate set (3) is arranged between the two lower die cushion blocks (24), and the linkage plate set (5) is provided with a push plate push rod (42) which sequentially penetrates through the ejector pin bottom plate (32), the ejector pin panel (31), the lower die plate (22) and the lower die forming insert (23) from bottom to top and is in threaded connection with the demoulding push plate (41);

a linkage plate through hole (51) which is completely penetrated from top to bottom is formed in the middle of the linkage plate group (5), and an ejector block (6) which extends into the linkage plate through hole (51) of the linkage plate group (5) and is driven by an ejection mechanism of the injection molding machine is screwed on the ejector pin bottom plate (32); the top block (6) is provided with a linkage groove (61), the linkage plate group (5) is provided with a horizontal moving part (71) and an elastic part for promoting the horizontal moving part (71) to move outwards, the lower die base plate (21) is fixedly screwed with a fixed stop block (72) positioned at the outer end side of the horizontal moving part (71), the upper end part of the fixed stop block (72) is a wedge-shaped stop block wedge-shaped part (721), the outer end part of the horizontal moving part (71) is a wedge-shaped moving part wedge-shaped part (711), and the inclined surface of the stop block wedge-shaped part (721) is contacted with the inclined surface of the moving part wedge-shaped part (711); when the injection mold is in a mold closing state, the upper mold forming insert (13), the lower mold forming insert (23) and the demolding push plate (41) jointly form an injection molding cavity, and the inner end part of the horizontal moving part (71) is embedded into the linkage groove (61) of the top block (6).

2. The ejector pin and push plate composite demoulding structure applied to the injection mould according to claim 1, is characterized in that: the linkage plate set (5) comprises a linkage panel (52) and a linkage bottom plate (53) which is screwed on the lower surface of the linkage panel (52), the lower end part of the push plate push rod (42) is fixedly clamped between the linkage panel (52) and the linkage bottom plate (53), and the linkage plate through hole (51) sequentially penetrates through the linkage panel (52) and the linkage bottom plate (53) from top to bottom.

3. The ejector pin and push plate composite demoulding structure applied to the injection mould as claimed in claim 2, is characterized in that: a movable piece mounting groove (54) communicated with the linkage plate through hole (51) is formed between the linkage panel (52) and the linkage bottom plate (53), and the horizontal movable piece (71) is embedded in the movable piece mounting groove (54);

the linkage bottom plate (53) is provided with a bottom plate through hole (55) which is open downwards and communicated with the movable piece mounting groove (54), and a stop block wedge-shaped part (721) of the fixed stop block (72) extends into the bottom plate through hole (55).

4. The ejector pin and push plate composite demoulding structure applied to the injection mould according to claim 1, is characterized in that: the elastic piece is a compression spring which is horizontally arranged, the outer end of the compression spring is abutted with the horizontal moving piece (71), and the inner end of the compression spring is abutted with the linkage plate group (5).

5. The ejector pin and push plate composite demoulding structure applied to the injection mould according to claim 1, is characterized in that: the upper surface of the ejector pin panel (31) is tightly screwed with an ejector pin plate stop block.

6. The ejector pin and push plate composite demoulding structure applied to the injection mould according to claim 1, is characterized in that: linkage plate dog (56) of vertical extension up are equipped with to linkage plate group (5) spiral shell, thimble plate group (3) have been seted up from last to running through in proper order down thimble board (31) the thimble board through-hole of thimble bottom plate (32), the upper end of linkage plate dog (56) passes the thimble board through-hole and extends to the upper end side of thimble board (31).

7. The ejector pin and push plate composite demoulding structure applied to the injection mould according to claim 1, is characterized in that: guide pillars (81) which are vertically arranged are installed on the lower die base plate (21), an upper guide sleeve (821) clamped between the ejector pin panel (31) and the ejector pin base plate (32) is installed on the ejector pin plate group (3), a lower guide sleeve (822) is installed on the linkage plate group (5), and the upper guide sleeve (821) and the lower guide sleeve (822) are respectively sleeved on the guide pillars (81).

8. The ejector pin and push plate composite demoulding structure applied to the injection mould according to claim 1, is characterized in that: a return spring (9) is arranged between the lower template (22) and the ejector pin plate group (3), the upper end of the return spring (9) is abutted against the lower template (22), and the lower end of the return spring (9) is abutted against the ejector pin plate group (3).

9. The ejector pin and push plate composite demoulding structure applied to the injection mould according to claim 8, is characterized in that: the lower template (22) is provided with a spring positioning hole (25) with a downward opening corresponding to the return spring (9), the upper end of the return spring (9) is embedded into the spring positioning hole (25) of the lower template (22), and the lower end of the return spring (9) is abutted to the upper surface of the ejector pin panel (31).