CN110900986A

CN110900986A - Inner core-pulling mechanism of injection mold

Info

Publication number: CN110900986A
Application number: CN201911397852.8A
Authority: CN
Inventors: 李孔富; 黄金香; 何继英
Original assignee: DATAMATIC GUANGZHOU INJECTION MOULD Co Ltd
Current assignee: DATAMATIC GUANGZHOU INJECTION MOULD Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-03-24

Abstract

The invention discloses an internal core-pulling mechanism of an injection mold, wherein a core-pulling mechanism which is convenient for an injection molding piece to be separated from a movable mold cavity in a mold opening state is arranged in the movable mold cavity, the core-pulling mechanism comprises a first support machine, an internal core-pulling slide block and a connecting rod, and the first support machine is movably arranged on a movable mold plate and can reciprocate in the movable mold cavity; the outside of first machine that props is formed with first push face, and the inside of first machine that props is formed with leads the pulling face, and first push face and lead the pulling face and be parallel to each other to be used for leading jointly and draw the slider in realizing that the compound die resets or the pull drawing of patterns, the one end of connecting rod forms the stiff end and stretches into first machine that props and with lead the pulling face direction cooperation, the other end of connecting rod form the link and with loose core slider flexonics, loose core slider slidable supports to press in first push face. The slight swinging fine adjustment between the inner drawing sliding block and the first connecting rod can be realized, the local extrusion stress is greatly reduced, the inner drawing sliding block slides smoothly, and the risk of burning of the inner drawing is reduced.

Description

Inner core-pulling mechanism of injection mold

Technical Field

The invention relates to a plastic mold structure, in particular to an inner core-pulling mechanism of an injection mold.

Background

Injection molding is a method for producing and molding industrial products. The plastic mold used in the injection molding process is a tool which is matched with a plastic molding machine in the plastic processing industry and gives a complete configuration and accurate dimension to a plastic product. Because of the variety and processing method of plastic, and the structure of plastic molding machines and plastic products are various, the variety and structure of plastic molds are also various.

The loose core in the plastic mold is used for processing the position on the parting surface of the injection molding part, which cannot be demolded, belongs to an inverted hook processing system, is a structure of the mold, and is a mechanism for ensuring smooth demolding of a product, which is also called a sliding block. For example, the side surface of the plastic part is provided with a hole, after the mold is opened, if the core in the hole is not pulled out, the product cannot be ejected, at the moment, the mold structure adopts a slide block structure, the core in the hole is made to be movable, an inclined guide pillar is matched with a fixed mold, the slide block moves along with the mold opening or mold closing, and the movement is called core pulling.

In the traditional core pulling mechanism, a T block is used for realizing the connection and the matching of a support machine and an inner pulling slide block, and different force-bearing matching surfaces exist in the up-down movement process. In theoretical design, all matching surfaces are attached, but errors cannot be avoided during processing, so that the problem of over-tightness or over-looseness or even jamming is caused in the motion process.

The support machine and the inner drawer are rigidly connected by the T block, and when the matching surface has errors, the slide block has the possibility of generating rotary extrusion due to uneven stress. The extrusion can produce very big frictional force, and frictional force can concentrate on local rather than whole fitting surface, and the condition of interior pump stress surface wearing and tearing can certainly appear when the extrusion is serious, and the slip can be obstructed when serious, and the phenomenon of interior pump action jamming or burning out.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide an inner core pulling mechanism of an injection mold.

The purpose of the invention is realized by adopting the following technical scheme:

an inner core-pulling mechanism of an injection mold comprises a fixed mold plate and a movable mold plate which are arranged oppositely, wherein a fixed mold cavity and a movable mold cavity are respectively formed in the fixed mold plate and the movable mold plate; the movable mould plate comprises a mould closing state and a mould opening state, when the movable mould plate is in the mould closing state, the movable mould plate moves towards the direction close to the fixed mould plate so that the movable mould cavity and the fixed mould cavity are matched with each other to form a closed mould cavity for molding an injection molding part, and when the movable mould plate is in the mould opening state, the movable mould plate moves towards the direction far away from the fixed mould plate so that the movable mould cavity and the fixed mould cavity are separated from each other; a core pulling mechanism which is convenient for an injection molding piece to be separated from the movable mold cavity in a mold opening state is arranged in the movable mold cavity, the core pulling mechanism comprises a first support machine, an inner pulling slide block and a connecting rod, and the first support machine is movably arranged on the movable mold plate and can reciprocate in the movable mold cavity; the outside of first machine that props is formed with first push face, the inside of first machine that props is formed with leads the stretched surface, first push face with lead the stretched surface and be parallel to each other for being used for common direction interior slide block of taking out realizes that the compound die resets or the pull drawing of patterns, the one end of connecting rod forms the stiff end and stretches into first machine that props and with lead the stretched surface guide fit, the other end of connecting rod form the link and with the slider flexonics of loosing core, the slider of loosing core can slide to press in first push face.

Further, the coupling rod is perpendicular to the first pushing surface and the pull-guiding surface respectively.

Further, a second supporting machine is arranged on the movable template, a second pushing surface matched with the first pushing surface and guiding the inner drawing slide block is formed on the second supporting machine, one side of the inner drawing slide block is in press fit with the first pushing surface, and the other side of the inner drawing slide block is in press fit with the second pushing surface; the first pushing surface and the second pushing surface are perpendicular to each other.

Furthermore, a core pulling guide surface which is in guide fit with the first pushing surface is formed on one side, opposite to the first pushing surface, of the inner pulling slide block, a driving hole is formed in the core pulling guide surface, the connecting rod extends into the driving hole and is in hinged fit with the inner pulling slide block through a pin, and the rotation axis of the pin is perpendicular to the connecting rod.

Further, a gap is formed between the driving hole and the coupling rod, so that the coupling rod and the inner drawing slide block can swing around the rotation axis of the pin relatively.

Furthermore, a linkage hole penetrating through two ends of the first supporting machine is formed in the first supporting machine, one end of the linkage hole is communicated with the first pushing surface, and the other end of the linkage hole penetrates through the pull guide surface and is communicated with the outside of the first supporting machine; the connecting rod is connected to the linkage hole in a penetrating mode, and in the first direction, the inner diameter size of the linkage hole is larger than the outer diameter size of the connecting rod, so that the connecting rod can be located in the linkage hole to drive the inner drawing sliding block to slide.

Further, the linkage hole comprises a first linkage section and a second linkage section which are mutually connected; the first linkage section is arranged at one end close to the first pushing surface, the second linkage section is arranged at one end far away from the first pushing surface, and the inner diameter of the second linkage section is larger than that of the first linkage section in the second direction, so that the step formed between the second linkage section and the first linkage section forms the guide pulling surface.

Further, the coupling rod comprises a first rod section and a second rod section, the outer diameter of the second rod section is larger than that of the first rod section, and a step formed between the second rod end and the first rod section forms a pressing table in pressing fit with the guide and pull surface.

Further, a base plate is arranged on the abutting table.

Furthermore, the bottom of the movable mould plate is provided with a core pulling hole communicated with the movable mould cavity, the first support machine is movably arranged in the core pulling hole, and two ends of the first support machine penetrate out of the core pulling hole; the lower part of the movable mould plate is provided with an elastic plate for driving the first support machine, the elastic plate can move back and forth in the direction close to and away from the movable mould plate, and the first support machine penetrates out of the bottom of the movable mould plate and is fixedly connected with the elastic plate.

Compared with the prior art, the invention has the beneficial effects that:

the T-block connection is replaced by the first connection rod connection, so that the driving force is converted into flexible driving through rigid friction driving, when the inner slide block has a rotary extrusion tendency in the movement process of the inner drawing slide block, the first connection rod is flexibly connected with the inner drawing slide block, slight swinging fine adjustment between the inner drawing slide block and the first connection rod can be realized, the local extrusion stress is greatly reduced, the inner drawing slide block slides smoothly, and the risk of burning of the inner drawing is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of an internal core-pulling mechanism of the injection mold of the present invention;

FIG. 2 is a top view of the internal core pulling mechanism of the injection mold of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a cross-sectional view C-C of FIG. 2;

fig. 5 is a cross-sectional view taken along line D-D of fig. 3.

In the figure: 10. moving the template; 11. a movable die cavity; 12. core pulling holes; 13. a spring plate; 14. mounting grooves; 20. a first support machine; 21. a first push surface; 22. stretch-guiding noodles; 23. a linkage hole; 231. a first linkage section; 232. a second linkage section; 24. a groove; 30. an inner drawing slide block; 31. a core-pulling guide surface; 32. a drive aperture; 33. a pin; 40. a coupling rod; 41. a first pole segment; 42. a second pole segment; 43. a pressing table; 50. a second supporting machine; 51. a second pushing surface.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

As shown in figures 1-4, in order to avoid the inner core-pulling slide block 30 in the core-pulling mechanism from burning and making it slide on the supporting machine more smoothly, the present invention discloses an inner core-pulling mechanism of an injection mold, the whole structure part of the mold is basically consistent with the mold structure of the prior art, the inner core-pulling mechanism mainly comprises a fixed mold plate and a movable mold plate 10 which are arranged oppositely, and a fixed mold cavity and a movable mold cavity 11 are respectively formed in the fixed mold plate and the movable mold plate 10.

The movable mould plate 10 comprises a mould closing state and a mould opening state, when the movable mould plate 10 is in the mould closing state, the movable mould plate 10 moves towards the direction close to the fixed mould plate so as to enable the movable mould cavity 11 and the fixed mould cavity to be matched with each other to form a closed mould cavity for forming an injection molding part, an external injection molding rod is used for injecting glue, when the movable mould plate 10 is in the mould opening state, the movable mould plate 10 moves towards the direction far away from the fixed mould plate so as to enable the movable mould cavity 11 and the fixed mould cavity to be separated from each other, and the formed.

In order to solve the corresponding technical problem, a core pulling mechanism which is convenient for an injection molding part to be separated from the movable mold cavity 11 in a mold opening state is arranged in the movable mold cavity 11, specifically, the core pulling mechanism comprises a first support machine 20, an internal pulling slide block 30 and a connecting rod 40, the first support machine 20 is movably arranged on the movable mold plate 10 and can reciprocate in the movable mold cavity 11, specifically, the first support machine 20 can do lifting motion in the movable mold cavity 11 to lift the first support machine 20, so that the internal pulling slide block 30 is matched with the movable mold cavity 11 to form a mold cavity of a molded plastic part, or the internal pulling slide block 30 is lowered and dragged to be away from the molded plastic part to demould part of the plastic part.

Further, a first pushing surface 21 is formed outside the first supporting machine 20, a guiding surface 22 is formed inside the first supporting machine 20, the first pushing surface 21 and the guiding surface 22 are parallel to each other and jointly play a role in limiting the relative movement direction of the inner sliding block 30 and the first supporting machine 20, the inner sliding block 30 plays a role in die assembly, pushing, resetting or drawing and demolding, the inner sliding block 30 can respectively depend on the first pushing surface 21 and the guiding surface 22 for supporting and guiding in the lifting movement process of the first supporting machine 20 in the movable die cavity 11, so that the inner sliding block 30 can relatively reciprocate along the guiding directions of the first pushing surface 21 and the guiding surface 22, so as to realize the matching with the movable die cavity 11 to form the die cavity of the injection molding and the staggered separation of the injection molding, and in order to enable the inner sliding block 30 to more stably reciprocate on the first pushing surface 21 and the guiding surface 22 to slide on the action, one end of the connecting rod 40 forms a fixed end and extends into the first supporting machine 20 and is guided and matched with the guiding surface 22, the other end of the connecting rod 40 forms a connecting end and is flexibly connected with the core-pulling slide block, a space for the connecting rod 40 to move along the guiding direction of the first pushing surface 21 and the guiding surface 22 is arranged between the connecting rod 40 and the first propping machine 20, so that the core-pulling slide block can be slidably propped against the first pushing surface 21, in this example, when the movable mould plate 10 is in a mould closing state, the first propping machine 20 is at the highest position for jacking, and the inner pulling slide block 30 is positioned at the lower edge of the first pushing surface 21, when the movable mould plate 10 is converted from the mould closing state to the mould opening state, the first propping machine 20 is positioned in the movable mould cavity 11 for descending movement, the connecting rod 40 drives the inner pulling slide block 30 to gradually slide along the upper edge direction of the first pushing surface 21 and the guiding surface 22, so that the mould cavity surface of the inner pulling slide block 30 is separated from an injection molding piece, and in the process, the connecting rod 40 is connected to replace a T-block connection, so that the driving force is converted from rigid friction driving force into, when the internal drawing sliding block 30 has a rotating extrusion tendency in the movement process, the connecting rod 40 can slightly swing a shaft between the internal drawing sliding block 30 and the connecting rod 40 through the flexible matching with the sliding block to realize fine adjustment, so that the local extrusion stress is greatly reduced, the sliding block slides smoothly, and the risk of burning of the internal drawing is reduced.

In order to ensure that the relative angle between the coupling rod 40 and the inner drawing slider 30 is kept consistent, and the sliding of the inner drawing slider 30 on the first pushing surface 21 is more stable, the coupling rod 40 is respectively perpendicular to the first pushing surface 21 and the pull-guiding surface 22, and the parallel first pushing surface 21 and the pull-guiding surface 22 can ensure that the coupling rod 40 is kept in a state of being relatively perpendicular to the first pushing surface 21 and the pull-guiding surface 22, so that the inner drawing slider 30 can avoid large deflection between the coupling rod 40 and the inner drawing slider 30 as much as possible when being driven by the coupling rod 40.

In order to further improve the stability of the internal drawing slider 30, a second supporting machine 50 is arranged on the movable template 10, a second pushing surface 51 which is matched with the first pushing surface 21 and guides the internal drawing slider 30 is formed on the second supporting machine 50, one side of the internal drawing slider 30 is in abutting fit with the first pushing surface 21, and the other side of the internal drawing slider 30 is in abutting fit with the second pushing surface 51;

in the implementation process of the present invention, during the process of switching the die assembly state and the die opening state of the movable die plate 10 to and fro, the second pushing surface 51 abuts against the other side surface of the inner slide block 30, specifically, the second pushing surface 51 and the first pushing surface 21 abut against the two adjacent side surfaces of the inner slide block 30, and during this process, the inner slide block 30 slides on the second pushing surface 51 to and fro, so as to improve the stability of the inner slide block 30.

The core pulling guide surface 31 which is matched with the first pushing surface 21 in a guiding mode is formed on one side, opposite to the first pushing surface 21, of the inner pulling slide block 30, the core pulling guide surface 31 is parallel to the first pushing surface 21 and can slide on the first pushing surface 21, a driving hole 32 is formed in the core pulling guide surface 31, the connecting rod 40 extends into the driving hole 32 and is matched with the inner pulling slide block 30 in a hinged mode through a pin 33, and the rotating axis of the pin 33 is perpendicular to the connecting rod 40 and is in a T shape.

A gap is formed between the driving hole 32 and the coupling rod 40, so that the coupling rod 40 and the inward-drawing slider 30 can swing around the rotation axis of the pin 33 relatively, as shown in fig. 3, which is the first direction of the present invention, and the gap is opened in the upper edge and the lower edge of the driving hole 32.

More specifically, a linkage hole 23 penetrating through two ends of the first support machine 20 is formed in the first support machine 20, one end of the linkage hole 23 is communicated with the first pushing surface 21, and the other end of the linkage hole 23 penetrates through the pull guide surface 22 and is communicated with the outside of the first support machine 20;

the coupling rod 40 is inserted into the linkage hole 23, and as shown in the first direction of fig. 1, the inner diameter of the linkage hole 23 is larger than the outer diameter of the coupling rod 40, so that the coupling rod 40 can be located in the linkage hole 23 to drive the inner slide block 30 to slide, and theoretically, the relative angle between the coupling rod 40 and the linkage hole 23 is not changed during the displacement of the coupling rod 40 in the linkage hole 23.

The linkage hole 23 includes a first linkage section 231 and a second linkage section 232 which are engaged with each other; the first linkage section 231 is disposed at an end close to the first pushing surface 21, and the second linkage section 232 is disposed at an end far from the first pushing surface 21, as shown in the second direction of fig. 5, the inner diameter of the second linkage section 232 is larger than that of the first linkage section 231, so that the step formed between the second linkage section 232 and the first linkage section 231 forms the pull guide surface 22.

The coupling rod 40 comprises a first rod section 41 and a second rod section 42, the outer diameter of the second rod section 42 is larger than that of the first rod section 41, and a pressing platform 43 which is in pressing fit with the guide and pull surface 22 is formed by a step formed between the second rod end and the first rod section 41.

In order to facilitate the replacement of the components, a backing plate is provided on the pressing table 43.

In order to facilitate the first drive that props machine 20, the coring hole 12 that communicates movable die cavity 11 is seted up to the bottom of movable mould board 10, first machine 20 activity of propping sets up in coring hole 12 and both ends are worn out coring hole 12, the lower part of movable mould board 10 is provided with the bullet board 13 that is used for driving first machine 20 that props, bullet board 13 can be close to and keep away from the direction reciprocating motion of movable mould board 10, first machine 20 that props is worn out movable mould board 10 bottom and with bullet board 13 fixed connection, bullet board 13 accessible and cylinder, the hydro-cylinder, the connection of actuating mechanism such as spring is in order to realize driving first machine 20 that props and is at coring hole 12 internal displacement.

In this embodiment, there are two inner-drawing sliding blocks 30, certainly, a plurality of inner-drawing sliding blocks 30 may be provided under the condition of ensuring the same principle to satisfy the demolding process of the complex injection-molded part, and the number of the connecting rods 40 needs to be the same as that of the inner-drawing sliding blocks 30, and the sliding directions of the two inner-drawing sliding blocks 30 are different, as shown in fig. 3, in the first direction, an included angle is formed between the first pushing surfaces 21 matched with the two inner-drawing sliding blocks 30, so that the first supporting machine 20 slides and approaches in opposite directions respectively in the descending process, and one of the inner-drawing sliding blocks 30 has a smaller horizontal inclination angle, so that the guiding of the second supporting machine 50 is not required, and is used for separating from different parts of the injection-molded part respectively, and the working principle between the inner-drawing sliding blocks 30 is the same, and is.

When the movable mould plate 10 is switched from the mould opening state to the mould closing state, the elastic plate 13 drives the first support machine 20, a certain jacking force is exerted on the internal drawing slide block 30 through the connecting rod 40, at the moment, the first jacking surface 21 of the first supporting machine 20 exerts a certain jacking acting force on the core pulling guide surface 31 of the internal drawing slide block 30, due to the inclination of the first pushing surface 21, the inner slide 30 will slide down and up along the first pushing surface 21, eventually matching the movable mold cavity 11, when the movable mould plate 10 is switched from the mould closing state to the mould opening state, the elastic plate 13 drives the movable mould plate 10 to descend, at the moment, the guide and pull surface 22 of the first supporting machine 20 exerts an abutting acting force on the abutting table 43 of the connecting rod 40, so that the connecting rod 40 pulls the inner drawing slide block 30, in the process, the inner slide block 30 slides upwards along the guiding direction of the first pushing surface 21, and is staggered with the movable mold cavity 11 so as to release the core slide block part of the injection molding part.

In detail, the invention also discloses an assembling method of the inner core-pulling mechanism of the injection mold, which comprises the following steps:

s1, firstly, installing the internal drawing sliding block 30 to the movable mould plate 10 (the movable mould core is installed), then installing the first support machine 20 into the movable mould plate 10, and pressing the internal drawing sliding block 30 tightly;

s2, the connecting rod 40 penetrates through the second linkage section 232 of the linkage hole 23, so that the pressing platform 43 of the connecting rod 40 presses against the guide and pull surface 22;

the second linkage section 232 is larger than the first linkage section 231 in size, the second rod section 42 is larger than the first rod section 41 in size, and one end of the first rod section 41 penetrates from the second linkage section 232 to the first linkage section 231 until the first rod section 41 completely penetrates into the linkage hole 23. The mounting groove 14 on the side surface of the driven template 10 (and the rear mold core) enables the internal drawing slide block 30 to be connected and matched with the connecting rod 40 through a mounting pin 33;

the first rod section 41 is flexibly connected with the internal drawing sliding block 30 through the pin 33, the abutting table 43 of the connecting rod 40 can be matched with the guide pulling surface 22, the first rod section 41 is matched with the internal drawing sliding block 30 through the pin 33, the internal drawing sliding block 30 is tensioned, the connecting rod 40 is located in the linkage hole 23 and is not required to be fixed through other connecting components, and the assembling efficiency is improved.

S3, mounting a second supporting machine 50 on the movable template 10 to enable the inner drawing sliding block 30 to be matched with the second supporting machine 50;

s4, mounting the elastic plate 13 on the movable template 10, and fixedly connecting the first support machine 20 with the elastic plate through screws;

the above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. An inner core-pulling mechanism of an injection mold comprises a fixed mold plate and a movable mold plate which are arranged oppositely, wherein a fixed mold cavity and a movable mold cavity are respectively formed in the fixed mold plate and the movable mold plate; the movable mould plate comprises a mould closing state and a mould opening state, when the movable mould plate is in the mould closing state, the movable mould plate moves towards the direction close to the fixed mould plate so that the movable mould cavity and the fixed mould cavity are matched with each other to form a closed mould cavity for molding an injection molding part, and when the movable mould plate is in the mould opening state, the movable mould plate moves towards the direction far away from the fixed mould plate so that the movable mould cavity and the fixed mould cavity are separated from each other; the method is characterized in that:

a core pulling mechanism which is convenient for an injection molding piece to be separated from the movable mold cavity in a mold opening state is arranged in the movable mold cavity, the core pulling mechanism comprises a first support machine, an inner pulling slide block and a connecting rod, and the first support machine is movably arranged on the movable mold plate and can reciprocate in the movable mold cavity;

the outside of first machine that props is formed with first push face, the inside of first machine that props is formed with leads the stretched surface, first push face with lead the stretched surface and be parallel to each other for being used for common direction interior slide block of taking out realizes that the compound die resets or the pull drawing of patterns, the one end of connecting rod forms the stiff end and stretches into first machine that props and with lead the stretched surface guide fit, the other end of connecting rod form the link and with the slider flexonics of loosing core, the slider of loosing core can slide to press in first push face.

2. The internal core pulling mechanism of an injection mold according to claim 1, wherein: the connecting rod is perpendicular to the first pushing surface and the pull guiding surface respectively.

3. The internal core pulling mechanism of an injection mold according to claim 1, wherein: a second pushing surface matched with the first pushing surface and guiding the inner pulling slide block is formed on the second supporting machine, one side of the inner pulling slide block is in abutting press fit with the first pushing surface, and the other side of the inner pulling slide block is in abutting press fit with the second pushing surface;

the first pushing surface and the second pushing surface are perpendicular to each other.

4. The internal core pulling mechanism of an injection mold according to claim 1, wherein: the inner drawing sliding block is provided with a first pushing surface, a core drawing guide surface matched with the first pushing surface in a guide mode is formed on one side, opposite to the first pushing surface, of the inner drawing sliding block, a driving hole is formed in the core drawing guide surface, the connecting rod extends into the driving hole and is matched with the inner drawing sliding block in a hinged mode through a pin, and the rotation axis of the pin is perpendicular to the connecting rod.

5. The internal core pulling mechanism of an injection mold according to claim 4, wherein: a gap is formed between the driving hole and the coupling rod, so that the coupling rod and the inner drawing slide block can swing around the rotation axis of the pin relatively.

6. The internal core pulling mechanism of an injection mold according to claim 2, wherein: linkage holes penetrating through two ends of the first supporting machine are formed in the first supporting machine, one end of each linkage hole is communicated with the first pushing surface, and the other end of each linkage hole penetrates through the pull guide surface and is communicated with the outside of the first supporting machine;

the connecting rod is connected to the linkage hole in a penetrating mode, and in the first direction, the inner diameter size of the linkage hole is larger than the outer diameter size of the connecting rod, so that the connecting rod can be located in the linkage hole to drive the inner drawing sliding block to slide.

7. The internal core pulling mechanism of an injection mold according to claim 6, wherein: the linkage hole comprises a first linkage section and a second linkage section which are mutually connected; the first linkage section is arranged at one end close to the first pushing surface, the second linkage section is arranged at one end far away from the first pushing surface, and the inner diameter of the second linkage section is larger than that of the first linkage section in the second direction, so that the step formed between the second linkage section and the first linkage section forms the guide pulling surface.

8. The internal core pulling mechanism of an injection mold according to claim 7, wherein: the connecting rod comprises a first rod section and a second rod section, the outer diameter of the second rod section is larger than that of the first rod section, and a pressing table in pressing fit with the guide and pull surface is formed by a step formed between the second rod end and the first rod section.

9. The internal core pulling mechanism of an injection mold according to claim 8, wherein: and a base plate is arranged on the abutting table.

10. The internal core pulling mechanism of an injection mold according to claim 1, wherein: the bottom of the movable mould plate is provided with a core pulling hole communicated with the movable mould cavity, the first support machine is movably arranged in the core pulling hole, and two ends of the first support machine penetrate out of the core pulling hole;

the lower part of the movable mould plate is provided with an elastic plate for driving the first support machine, the elastic plate can move back and forth in the direction close to and away from the movable mould plate, and the first support machine penetrates out of the bottom of the movable mould plate and is fixedly connected with the elastic plate.