CN108454032B

CN108454032B - Mould core-pulling anti-retreating mechanism and mould

Info

Publication number: CN108454032B
Application number: CN201710096916.5A
Authority: CN
Inventors: 虞臣春; 郭建钢; 寿奇奇; 钱小林
Original assignee: Shanghai Xinyu Electronic Technology Co ltd
Current assignee: Shanghai Xinyu Electronic Technology Co ltd
Priority date: 2017-02-22
Filing date: 2017-02-22
Publication date: 2021-11-23
Anticipated expiration: 2037-02-22
Also published as: CN108454032A

Abstract

The invention provides a mold core-pulling anti-retreating mechanism which comprises a mold body, a driving device arranged on the mold body, a transmission piece connected with the output end of the driving device, an inner-pulling fixing block, an inner tap arranged on the inner-pulling fixing block and an anti-retreating block, wherein a guide groove extending along the inner direction and the outer direction is arranged in the inner-pulling fixing block; when the driving device pushes the transmission piece to move forwards, the transmission piece pushes the anti-rollback block, the inner pulling fixing block and the inner tap to move forwards, and the transmission piece pushes the anti-rollback block to extend outwards and be embedded into the limiting groove of the die body; when the driving device pulls the transmission piece to move backwards, the transmission piece pulls the anti-returning block to contract inwards and withdraw from the limiting groove, and the transmission piece pulls the anti-returning block, the internal pulling fixing block and the internal tap to move backwards.

Description

Mould core-pulling anti-retreating mechanism and mould

Technical Field

The invention relates to a mold core-pulling mechanism, in particular to a mold core-pulling anti-retreating mechanism and a mold.

Background

When an injection mold is used for processing a product with a through hole, a groove or a boss, the product cannot be directly removed from the mold in the demolding process, and a core for forming the through hole, the groove or the boss must be firstly extracted from a mold body, namely the core is pulled. There is a need for a mechanism that can extract and reset the core, i.e., a core-pulling mechanism.

When the fixed die is used for pulling the core, the oil cylinder is usually adopted for driving. In the production process, the core is pushed to move forwards in place relative to the die body by the oil cylinder; then carrying out injection molding processing; and after the injection molding is finished, the oil cylinder pulls the core to retreat relative to the mold body, so that the core pulling is realized. However, in the injection molding process, the core will be retracted along the core-pulling direction due to the injection molding pressure, so that the product is unqualified. Meanwhile, because the core is pulled by the fixed die, a common locking block cannot be added. Therefore, a core-pulling anti-back mechanism is needed to prevent the core, i.e. the inner tap, from backing back in the injection molding process so as to improve the product defects.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a mold core back withdrawal prevention mechanism which can effectively prevent the withdrawal of an inner tap.

In order to achieve the purpose, the invention provides a mold core-pulling anti-retreating mechanism which comprises a mold body, a driving device arranged on the mold body, a transmission part connected with the output end of the driving device, an inner pulling fixing block, an inner tap arranged on the inner pulling fixing block and an anti-retreating block, wherein a guide groove extending along the inner direction and the outer direction is arranged in the inner pulling fixing block; when the driving device pushes the transmission piece to move forwards, the transmission piece pushes the anti-rollback block, the inner pulling fixing block and the inner tap to move forwards, and the transmission piece pushes the anti-rollback block to extend outwards and be embedded into the limiting groove of the die body; when the driving device pulls the transmission piece to move backwards, the transmission piece pulls the anti-returning block to contract inwards and withdraw from the limiting groove, and the transmission piece pulls the anti-returning block, the internal pulling fixing block and the internal tap to move backwards.

Further, the initiative portion is the T type groove that extends along the slant internal direction, passive portion is T type arch, T type arch inlays in T type groove.

Further, the transmission part comprises an active block, and the active part is positioned on the active block.

Furthermore, the two sides of the active block are provided with active parts.

Furthermore, the driving blocks are multiple, the transmission part further comprises a connecting plate connected with the output end of the driving device, and all the driving blocks are fixedly connected with the connecting plate.

Further, the anti-rollback block is multiple.

Furthermore, a limiting bulge is arranged on the inner pulling fixing block, and a contraction gap is formed between the limiting bulge and the transmission piece; in the backward moving process of the transmission piece, when the moving distance is equal to the contraction gap, the anti-returning block exits from the limiting groove, the limiting bulge on the internal drawing fixing block abuts against the transmission piece, and the transmission piece drives the internal drawing fixing block and the internal tap to move backward.

Furthermore, a T-shaped bushing is mounted on the inner pulling fixing block through a limiting screw, and the outer edge of the T-shaped bushing protrudes to form a limiting protrusion; the transmission part is provided with a T-shaped through hole, the T-shaped bushing is embedded in the T-shaped through hole, and the contraction gap is formed between the front end face of the outer edge protrusion and the step side wall of the T-shaped through hole.

Further, the mold core-pulling anti-retreating mechanism further comprises an in-place sensor installed on the mold body, wherein the in-place sensor is used for detecting whether the transmission part moves forwards or backwards in place.

As described above, the mold core-pulling anti-receding mechanism according to the present invention has the following beneficial effects:

the working principle of the mold core-pulling anti-retreating mechanism is as follows: when the driving device pushes the transmission piece to move forwards, the transmission piece pushes the anti-rollback block, the internal pulling fixing block and the internal tap to move forwards, and under the matching action of the driving part and the driven part, the transmission piece pushes the anti-rollback block to extend outwards and be embedded into the limiting groove of the die body, at the moment, the outer end of the anti-rollback block is embedded into the limiting groove, the inner end of the anti-rollback block is embedded into the guide groove, and the internal pulling fixing block and the internal tap are effectively prevented from moving relative to the die body by utilizing the matching action of the limiting groove and the anti-rollback block, so that the function of effectively preventing the internal tap from moving back relative to the die body is realized, and the quality of a processed product of the invention is ensured to be higher. When the driving device pulls the transmission piece to move backwards, under the matching action of the driving part and the driven part, the transmission piece pulls the anti-rollback block to contract inwards and exit from the limiting groove, and the transmission piece pulls the anti-rollback block, the internal pulling fixing block and the internal tap to move backwards, so that core pulling is realized.

Another object of the present invention is to provide a mold with high quality of processed products.

The invention provides a mold, which comprises a core-pulling anti-retreating mechanism of the mold.

As described above, the mold according to the present invention has the following advantageous effects:

in the process of processing products by the die, the inner tap of the die can be effectively prevented from retreating relative to the die body by using the die core-pulling retreat-preventing mechanism, so that the quality of the processed products by the die is ensured to be higher.

Drawings

FIG. 1 is a schematic structural view of a mold core-pulling anti-receding mechanism according to the present invention.

Fig. 2 is a perspective view of the mold of the present invention.

Fig. 3 is a front view of the mold of the present invention.

FIG. 4 is a front view of the mold core back mechanism of the present invention.

Fig. 5 is a rear view of fig. 4.

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

Fig. 7 is a top view of fig. 4.

Fig. 8 is a schematic structural view of fig. 7 without the cover plate.

Fig. 9 is a perspective view of fig. 8.

FIG. 10 is a schematic diagram of the engagement between the transmission member and the anti-rollback block of the present invention.

Fig. 11 is a schematic diagram of the active block and two anti-rollback blocks in the present invention.

Fig. 12 is a schematic structural diagram of the active block of the present invention.

Fig. 13 is a schematic structural diagram of an anti-rollback block in the present invention.

Description of the element reference numerals

1 mould body 4 internal pulling fixed block

11 guide groove of limiting groove 41

12 core-pulling hole 42 cover plate

2 drive means 43 limit projection

21 connecting projection 44 shrink gap

45T-shaped lining sleeve of 3 transmission piece

31 outer edge projection of active part 451

311T-shaped groove 46 fixed block

32 active block 5 inner tap

33 connecting plate 6 anti-return block

331 touch block 61 passive part

332 connecting with the groove 611T-shaped projection

333 opening 7 screw

34T-shaped through hole 71 limiting screw

341 step side wall 8 in-place sensor

81 travel switch

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.

In the embodiment of the invention: as shown in fig. 1, the left-right direction of the paper surface is defined as the front-rear direction, and the direction from the center of the coring hole 12 to the side wall is defined as the inside-outside direction.

As shown in fig. 1 to 13, the present invention provides a mold core-pulling anti-receding mechanism, which includes a mold body 1, a driving device 2 installed on the mold body 1, a transmission member 3 connected to an output end of the driving device 2, an inner pulling fixing block 4, an inner tap 5 installed on the inner pulling fixing block 4, and an anti-receding block 6. Wherein, the inner drawing fixed block 4 is provided with a guide groove 41 extending along the inner and outer directions, and the anti-return block 6 is embedded in the guide groove 41; the driving part 31 is arranged on the driving part 3, the passive part 61 matched with the driving part 31 is arranged on the anti-rollback block 6, and the limit groove 11 is arranged on the die body 1. When the driving device 2 pushes the transmission piece 3 to move forward, the transmission piece 3 pushes the anti-rollback block 6, the internal drawing fixed block 4 and the internal tap 5 to move forward, and under the matching action of the driving part 31 and the driven part 61, the transmission piece 3 pushes the anti-rollback block 6 to extend outward and be embedded into the limiting groove 11 of the die body 1, at the moment, the outer end of the anti-rollback block 6 is embedded into the limiting groove 11, and the inner end of the anti-rollback block 6 is embedded into the guide groove 41, and the internal drawing fixed block 4 and the internal tap 5 are effectively prevented from moving relative to the die body 1 by utilizing the matching action of the limiting groove 11 and the anti-rollback block 6, so that the function of effectively preventing the internal tap 5 from rolling back relative to the die body 1 is realized, and the quality of a processed product of the invention is ensured to be higher. When the driving device 2 pulls the transmission member 3 to move backwards, under the matching action of the driving part 31 and the driven part 61, the transmission member 3 pulls the anti-rollback block 6 to contract inwards and withdraw from the limiting groove 11, and the transmission member 3 pulls the anti-rollback block 6, the internal pulling fixing block 4 and the internal tap 5 to move backwards, so that core pulling is realized.

Meanwhile, as shown in fig. 1 to 13, the invention also provides a mold, which comprises the mold core-pulling anti-back mechanism. In the process of processing products by the die, the inner tap 5 of the die can be effectively prevented from retreating relative to the die body 1 by using the die core-pulling retreat-preventing mechanism, so that the quality of the processed products by the die is ensured to be higher.

As shown in fig. 1, fig. 6, and fig. 11 to fig. 13, in the present embodiment, the active portion 31 is a T-shaped groove 311 extending in an obliquely inward direction, i.e., a forward and inward direction, the passive portion 61 is a T-shaped protrusion 611, and the T-shaped protrusion 611 is embedded in the T-shaped groove 311. When the transmission member 3 moves forward, under the matching action of the T-shaped groove 311 and the T-shaped protrusion 611, the transmission member 3 will apply a force to the anti-retraction block 6 in an oblique outward direction, i.e. a forward and outward direction, and at the same time, since the anti-retraction block 6 is embedded in the guide groove 41 of the internal-retraction fixing block 4, the anti-retraction block 6 will extend outward relative to the internal-retraction fixing block 4 and be embedded in the limit groove 11 on the mold body 1. When the transmission member 3 moves backwards, the transmission member 3 applies a force to the anti-retraction block 6 in an oblique inward direction, i.e., in a backward and inward direction, and the anti-retraction block 6 contracts inwards relative to the inward-drawing fixed block 4 and exits from the limit groove 11 on the mold body 1. In this embodiment, the T-shaped protrusion 611 also extends in an inner oblique direction, and the passive part 61 is located at the inner end of the anti-retraction block 6. Meanwhile, a core-pulling hole 12 is formed in the side wall of the die body 1 in this embodiment, the limiting groove 11 is located in the side wall of the core-pulling hole 12, the internal core-pulling fixing block 4 is embedded in the core-pulling hole 12, and the internal tap 5 extends into the inner cavity of the die body 1.

In another embodiment, the driving portion 31 is a T-shaped protrusion structure, and the driven portion 61 is a T-shaped groove extending in an oblique inward direction.

As shown in fig. 4 to 10, there are a plurality of anti-rollback blocks 6 in the present invention. The number of the limiting grooves 11 is the same as that of the anti-rollback blocks 6 in the present embodiment. Thus, when all the anti-rollback blocks 6 extend out of the internal drawing fixed block 4 and are respectively embedded into the corresponding limiting grooves 11, the anti-rollback capacity of the anti-rollback device is enhanced by the cooperation effect of the plurality of anti-rollback blocks 6 and the limiting grooves 11.

As shown in fig. 1, 6, and 10 to 12, the transmission member 3 includes an active block 32, and the active portion 31 is located on the active block 32. Meanwhile, in the present embodiment, the driving portions 31 are disposed on both sides of the driving block 32, and the driving portions 31 on both sides of the driving block 32 are respectively matched with the passive portions 61 of the anti-rollback block 6. When the active block 32 moves forward or backward and applies corresponding forces to the anti-retraction blocks 6 on both sides, the opposite acting forces applied by the anti-retraction blocks 6 are applied to both sides of the active block 32, and the forces applied to both sides of the active block 32 are offset in the inward and outward directions, so as to ensure the stress balance of the active block 32 in the inward and outward directions and avoid the deviation or deformation of the active block 32 in the inward and outward directions in long-term use, thereby prolonging the service life and improving the stability of the invention. In addition, in the present embodiment, the driving portions 31 are disposed on both sides of the driving block 32, so as to drive the anti-rollback blocks 6 to extend outward and cooperate with the limiting grooves 11, thereby enhancing the anti-rollback capability of the present invention. In the present embodiment, the active portion 31 is located at the front end of the active block 32, and the front end of the active block 32 has a trapezoidal shape.

As shown in fig. 1, 6 and 10, the number of the active blocks 32 is plural in the present invention. Thus, the invention utilizes the plurality of driving blocks 32 to respectively drive the plurality of anti-rollback blocks 6 to extend outwards and be embedded into the corresponding limiting grooves 11, so as to enhance the anti-rollback capability of the invention. Meanwhile, the transmission member 3 of the present invention further includes a connection plate 33 connected to the output end of the driving device 2, and all the driving blocks 32 are fixedly connected to the connection plate 33. When the output end of the driving device 2 pushes the connecting plate 33 to move forward or backward, the connecting plate 33 drives all the active blocks 32 to move forward or backward together, and all the active blocks 32 respectively drive all the anti-rollback blocks 6 to extend outward or contract inward together.

As shown in fig. 10, in the present embodiment, there are two active blocks 32, and the two active blocks 32 are symmetrically installed on both sides of the connecting plate 33 by the screws 7. In this embodiment, there are 4 anti-rollback blocks 6, and each two anti-rollback blocks 6 are respectively matched with two sides of one active block 32. Meanwhile, the present embodiment is provided with a cover plate 42 at the outer side of the junction of the active block 32 and the anti-rollback block 6. The cover plate 42 is fixed on the internal drawing fixed block 4 through 4 screws 7.

As shown in fig. 1 and 6, the inner pulling fixing block 4 of the present invention is provided with a limiting protrusion 43, and a contraction gap 44 is provided between the limiting protrusion 43 and the driving member 3 in the front-rear direction. When the transmission member 3 moves backward and the moving distance is equal to the contraction gap 44, the transmission member 3 pulls the anti-rollback block 6 to exit from the limiting groove 11, that is, the limiting groove 11 loses the limiting effect on the anti-rollback block 6, and the limiting protrusion 43 on the internal withdrawing fixing block 4 abuts against the transmission member 3. With the continuous backward movement of the transmission member 3, under the abutting action of the limiting protrusion 43 and the transmission member 3, the transmission member 3 drives the inner pulling fixing block 4 and the inner tap 5 to move backward together, so that the core pulling is realized; and because the transmission member 3 has no longer moved backward relative to the internal drawing fixed block 4 at this time, the transmission member 3 no longer drives the anti-retraction block 6 to continue to retract inward.

As shown in fig. 1 and 6, a T-shaped bushing 45 is mounted on the rear end surface of the internal draw-out fixing block 4 by a limit screw 71 in the present embodiment, and an outer edge projection 451 of the T-shaped bushing 45 forms the limit projection 43. Meanwhile, the transmission member 3 is provided with a T-shaped through hole 34, the T-shaped bushing 45 is embedded in the T-shaped through hole 34, and the contraction gap 44 is formed between the front end surface of the outer edge projection 451 of the T-shaped bushing 45 and the step side wall 341 of the T-shaped through hole 34. When the transmission member 3 moves backward by the distance equal to the contraction gap 44, the front end surface of the outer edge projection 451 of the T-shaped bush 45 abuts against the step side wall 341 of the T-shaped through hole 34. In addition, when the T-shaped bushing 45 moves backward with respect to the T-shaped through hole 34, the side wall of the T-shaped through hole 34 has a guiding function for the T-shaped bushing 45. And 4 of the T-shaped bushings 45 are respectively installed on the rear end surface of the inner pulling fixing block 4 and adjacent to four corners in this embodiment.

As shown in fig. 1 and fig. 5 to 9, the inner tap 5 in this embodiment is fixed to the inner fixed block 4 by a fixing block 46, and the fixing block 46 is fixed to the inner fixed block 4 by a screw 7. In addition, the internal pulling fixing block 4 is an integrally formed structure in this embodiment, so as to facilitate processing and manufacturing.

As shown in fig. 3 and 4, the mold core-pulling anti-receding mechanism further includes an in-place sensor 8 mounted on the mold body 1, where the in-place sensor 8 is used to detect whether the transmission member 3 moves forward or backward in place, and further detect whether the inner core-pulling fixing block 4 and the inner tap 5 move forward or backward in place. In the present embodiment, the position sensor 8 employs two travel switches 81, and the two travel switches 81 are spaced apart from each other in the front-rear direction. Meanwhile, in this embodiment, the connecting plate 33 is provided with a touch block 331 having a bending structure. When the driving device 2 drives the transmission member 3, the inner pulling fixing block 4 and the inner tap 5 to move forward to a certain position, the outer end of the touch block 331 touches one of the travel switches 81, and the driving device 2 is controlled to stop driving forward. When the driving device 2 drives the transmission member 3, the inner pulling fixing block 4 and the inner tap 5 to move to the right position, the outer end of the touch block 331 touches the other travel switch 81, and the driving device 2 is controlled to stop driving backwards.

As shown in fig. 4, 9 and 10, the output end of the driving device 2 is provided with a connecting protrusion 21, and the connecting plate 33 is provided with a connecting groove 332, and the connecting groove 332 has a T-shaped cross section; the coupling projection 21 engages in the coupling groove 332, so that a detachable connection between the output of the drive 2 and the transmission element 3 is achieved. In this embodiment, an opening 333 is formed at one end of the connecting groove 332, and during the assembling process, the connecting protrusion 21 is inserted into the opening 333 of the connecting groove 332, which is convenient to operate. Meanwhile, the driving device 2 in this embodiment employs an oil cylinder.

As shown in fig. 1, the overall working principle of the die of the present invention is as follows:

1) when the die is closed, the driving device 2 pushes the connecting plate 33 to move forwards, the connecting plate 33 pushes the two driving blocks 32 to move forwards simultaneously, the T-shaped groove 311 on the driving block 32, namely the driving part 31, applies a forward and outward force to the T-shaped protrusion 611 of the anti-retraction block 6, namely the driven part 61, the 4 anti-retraction blocks 6 drive the inner drawing fixed block 4 and the inner tap 5 to move forwards along the core drawing hole 12 of the die body 1 under the action of the force until the 4 anti-retraction blocks 6 respectively correspond to the 4 limiting grooves 11 on the side wall of the core drawing hole 12, the 4 anti-retraction blocks 6 simultaneously extend outwards and are embedded into the 4 limiting grooves 11 under the action of the force, and the inner tap 5 is moved forwards in place at the moment, when the anti-retraction blocks 6 are embedded into the limiting grooves 11 in place, the contact block 331 on the connecting plate 33 contacts with one of the travel switch 81, and the driving device 2 stops driving forwards after the signal is obtained, and (5) completing mold closing.

2) Performing injection molding processing, and forming a product; at the moment, the outer end of the anti-rollback block 6 is embedded in the limiting groove 11 of the die body 1, the inner end of the anti-rollback block is embedded in the guide groove 41 of the internal-drawing fixed block 4, and the internal tap 5 is fixed on the internal-drawing fixed block 4, so that the internal tap 5 can still not rollback relative to the die body 1 under the injection pressure, and the quality of a processed product of the anti-rollback die is higher.

3) When the mold is opened, the driving device 2 pulls the connecting plate 33 to move backwards, and the connecting plate 33 pulls the two driving blocks 32 to move backwards simultaneously; the T-shaped groove 311 on the active block 32, namely the active part 31, applies a backward and inward force to the T-shaped protrusion 611 of the anti-retraction block 6, namely the passive part 61, and the 4 anti-retraction blocks 6 retract inwards at the same time under the action of the force, so that the connecting plate 33 and the active block 32 move backwards relative to the inward-drawing fixed block 4 in the process; when the moving distance is the shrinkage gap 44, the 4 anti-retraction blocks 6 already exit from the limiting groove 11, the step side walls 341 of the 4T-shaped through holes 34 on the connecting plate 33 are all abutted against the 4T-shaped bushings 45 on the inner-drawing fixed block 4, and as the connecting plate 33 continues to move backwards, the connecting plate 33 drives the inner-drawing fixed block 4 and the inner tap 5 to move backwards together along the core-drawing hole 12; when the touch block 331 on the connecting plate 33 touches another travel switch 81, the driving device 2 stops driving backward by the signal, the connecting plate 33 stops moving backward, the inner tap 5 moves backward to a position, and the core pulling is completed.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a mould is loosed core and is prevented moving back mechanism which characterized in that: the anti-rollback device comprises a die body (1), a driving device (2) arranged on the die body (1), a transmission piece (3) connected with the output end of the driving device (2), an internal-drawing fixing block (4), an internal tap (5) arranged on the internal-drawing fixing block (4), and an anti-rollback block (6), wherein a guide groove (41) extending along the internal and external directions is formed in the internal-drawing fixing block (4), the anti-rollback block (6) is embedded in the guide groove (41), an active part (31) is arranged on the transmission piece (3), a passive part (61) matched with the active part (31) is arranged on the anti-rollback block (6), and a limit groove (11) is formed in the die body (1); when the driving device (2) pushes the transmission piece (3) to move forwards, the transmission piece (3) pushes the anti-rollback block (6), the internal pulling fixing block (4) and the internal tap (5) to move forwards, and the transmission piece (3) pushes the anti-rollback block (6) to extend outwards and be embedded into the limiting groove (11) of the die body (1); when the driving device (2) pulls the transmission piece (3) to move backwards, the transmission piece (3) pulls the anti-rollback block (6) to contract inwards and exit from the limiting groove (11), and the transmission piece (3) pulls the anti-rollback block (6), the internal drawing fixing block (4) and the internal tap (5) to move backwards; the transmission piece (3) comprises an active block (32), and the active part (31) is positioned on the active block (32); the driving pieces (32) are multiple, the transmission piece (3) further comprises a connecting plate (33) connected with the output end of the driving device (2), and all the driving pieces (32) are fixedly connected with the connecting plate (33); the mold core-pulling anti-retreating mechanism further comprises an in-place sensor (8) arranged on the mold body (1), and the in-place sensor (8) is used for detecting whether the transmission piece (3) moves forwards or backwards in place; the in-place sensor (8) adopts two travel switches (81), the two travel switches (81) are distributed at intervals along the front-back direction, and the connecting plate (33) is provided with a touch block (331) in a bent structure; when the driving device (2) drives the transmission piece (3), the internal pulling fixing block (4) and the internal tap (5) to move forward to positions, the outer end of the touch block (331) touches one of the travel switches (81), and the driving device (2) is controlled to stop driving forward; when the driving device (2) drives the transmission piece (3), the internal pulling fixing block (4) and the internal tap (5) to move backwards to the position, the outer end of the touch block (331) touches another travel switch (81), and the driving device (2) is controlled to stop driving backwards; a limiting bulge (43) is arranged on the inner pulling fixing block (4), and a contraction gap (44) is arranged between the limiting bulge (43) and the transmission piece (3); in the backward moving process of the transmission piece (3), when the moving distance is equal to the contraction gap (44), the anti-returning block (6) exits from the limiting groove (11), the limiting bulge (43) on the internal pulling fixing block (4) is abutted against the transmission piece (3), and the transmission piece (3) drives the internal pulling fixing block (4) and the internal tap (5) to move backward; a T-shaped bushing (45) is mounted on the inner pulling fixing block (4) through a limiting screw (71), and a limiting bulge (43) is formed by an outer edge bulge (451) of the T-shaped bushing (45); the transmission piece (3) is provided with a T-shaped through hole (34), the T-shaped bushing (45) is embedded in the T-shaped through hole (34), and the contraction gap (44) is formed between the front end face of the outer edge protrusion (451) and the step side wall (341) of the T-shaped through hole (34).

2. The mold core-pulling anti-retreating mechanism according to claim 1, characterized in that: the driving portion (31) is a T-shaped groove (311) extending along the oblique inner direction, the driven portion (61) is a T-shaped protrusion (611), and the T-shaped protrusion (611) is embedded in the T-shaped groove (311).

3. The mold core-pulling anti-retreating mechanism according to claim 1, characterized in that: the two sides of the active block (32) are provided with active parts (31).

4. The mold core-pulling anti-retreating mechanism according to claim 1, characterized in that: the anti-rollback block (6) is multiple.

5. A mold, characterized in that: the mold core pulling anti-back mechanism comprises the mold core pulling anti-back mechanism according to any one of claims 1 to 4.