A core pulling mechanism with anti-back function and injection mold thereof

Abstract

The application discloses a core-pulling mechanism with a retreat-preventing function, which comprises a driving assembly, a transmission assembly in transmission connection with the driving assembly, a forming assembly connected to the transmission assembly, and limiting assemblies respectively connected to two sides of the transmission assembly, wherein the transmission assembly is provided with a second locking piece, the limiting assembly is provided with a retreat-preventing part corresponding to the second locking piece, the retreat-preventing part is in abutment with the second locking piece when the driving assembly drives the transmission assembly to a first position, the retreat-preventing part is in clamping connection with the second locking piece when the driving assembly drives the transmission assembly to a second position, so that the core-pulling mechanism is in a locking state. In the above manner, when injection molding is performed, the core-pulling mechanism is in the locking state, the forming assembly does not retreat due to excessive injection pressure, and the injection-molded product produced by the mold does not have phenomena such as flash, burr, burr and the like, so that the quality of the injection-molded product is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to injection mold technical field, especially to a core pulling mechanism with anti-retreating function and injection mold thereof. BACKGROUND

[0002] With the development of plastic industry, the application of plastic products has diversified in various fields, and the product modeling is more complex, so there are higher requirements for the precision of mold and the stability of size. The traditional injection mold lacks a self-locking mechanism, and usually relies on its own oil cylinder for locking during injection. During the injection process, when the oil pressure generated by the oil cylinder is less than the injection pressure, the row position insert retreats, causing the injection product to have multiple glues, beryllium edges, and flash, resulting in low quality of the injection product. SUMMARY

[0003] The present application provides a core pulling mechanism with anti-retreating function, which is used to solve the technical problem of low quality of injection products caused by the retreat of the row position insert relative to the injection mold due to excessive injection pressure during injection.

[0004] The present application is realized by the following technical scheme:

[0005] The present application provides a core pulling mechanism with anti-retreating function, which is used to solve the technical problem of low quality of injection products caused by the retreat of the row position insert relative to the injection mold due to excessive injection pressure during injection.

[0006] Further, the limiting assembly comprises a limiting seat, and a guide groove is arranged on the limiting seat, and the anti-retreating part is connected to the guide groove.

[0007] Further, the anti-retreating part comprises a pressing plate, an elastic member, and a first locking part, the pressing plate is connected to the limiting seat, one end of the elastic member is connected to the pressing plate, the other end of the elastic member is connected to the first locking part, and the first locking part is movably arranged in the guide groove.

[0008] Further, a locking groove is arranged on the first locking part, and the second locking part is clamped in the locking groove when the driving assembly drives the transmission assembly to the second position.

[0009] Further, the first locking piece is provided with a baffle, the guide groove is provided with a stop portion corresponding to the baffle, and the baffle abuts against the stop portion.

[0010] Further, the transmission assembly comprises a first transmission seat and a second transmission seat, the first transmission seat is in sliding connection with the limiting seat, the first transmission seat is provided with a containing cavity and an open slot, the containing cavity is in communication with the open slot, the second transmission seat is located in the containing cavity, the second transmission seat is in transmission connection with the driving assembly, and the second locking piece is connected to the second transmission seat and movably arranged in the open slot.

[0011] Further, the first transmission seat is further provided with a connecting slot, and the forming assembly is connected to the connecting slot.

[0012] Further, the transmission assembly further comprises a pressing strip for limiting the movement direction of the second transmission seat, and the pressing strip is connected to the first transmission seat.

[0013] Further, the driving assembly comprises a driving piece and a pull rod connected to the output end of the driving piece, one end of the pull rod is connected to the output end of the driving piece, and the other end of the pull rod is connected to the second transmission seat.

[0014] The application further provides an injection mold, which comprises a front mold, a rear mold and the core pulling mechanism with the anti-retreating function.

[0015] The application has the following beneficial effects:

[0016] Compared with the prior art, the core pulling mechanism with the anti-retreating function is provided with the second locking piece on the transmission assembly and the anti-retreating part on the limiting assembly, the second locking piece and the anti-retreating part are clamped to interlock the transmission assembly and the limiting assembly when the mold is closed, so that the core pulling mechanism is in a locked state, and the forming assembly does not retreat due to excessive injection pressure during injection molding, so that the injection molded product produced by the mold does not have the phenomena of flash, burr and burr, and the quality of the injection molded product is ensured.

[0017] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following preferred embodiments are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a schematic view of the overall structure of a core pulling mechanism with anti-backout function according to an embodiment of the present application;

[0019] Figure 2 Fig. 2 is a schematic view of the front structure of a core pulling mechanism with anti-backout function according to an embodiment of the present application;

[0020] Figure 3 Fig. 3 is a schematic view of the overall structure of an injection mold according to an embodiment of the present application; Figure 2 Fig. 4 is a schematic view of the A-A sectional view of a core pulling mechanism with anti-backout function according to an embodiment of the present application;

[0021] Figure 4 Fig. 5 is a schematic view of the structure of a core pulling mechanism with anti-backout function in the locked state according to an embodiment of the present application;

[0022] Figure 5 Fig. 6 is a schematic view of the exploded structure of a core pulling mechanism with anti-backout function according to an embodiment of the present application;

[0023] Figure 6 Fig. 7 is a schematic view of the overall structure of an injection mold according to an embodiment of the present application;

[0024] Figure 7 Fig. 8 is a schematic view of the front structure of an injection mold according to an embodiment of the present application;

[0025] Figure 8 Fig. 9 is a schematic view of the B-B sectional view of an injection mold according to an embodiment of the present application. Figure 7

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1. driving assembly; 11. driving piece; 12. pull rod; 2. limiting assembly; 21. limiting seat; 211. guide groove; 22. stop portion; 23. anti-backout component; 231. pressing plate; 232. elastic piece; 233. first locking piece; 2331. locking groove; 2332. guide surface; 234. sleeve; 235. baffle; 3. forming assembly; 31. insert piece; 32. connecting plate; 4. transmission assembly; 41. first transmission seat; 411. open groove; 4111. vertical open groove; 4112. horizontal open groove; 412. accommodating cavity; 413. mounting groove; 42. second transmission seat; 421. connecting groove; 43. pressing strip; 44. second locking piece; 441. first inclined surface; 442. second inclined surface; 5. injection mold; 51. front mold; 511. A plate; 512. runner; 513. front mold fixing plate; 514. first mold core; 5131. injection port; 52. back mold; 521. B plate; 522. back mold support plate; 523. first back mold ejector plate; 524. second back mold ejector plate; 525. back mold ejector pin; 526. back mold fixing plate; 527. second mold core. DETAILED DESCRIPTION​

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the drawings described, and are only intended to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be connected, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0034] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0035] Before the injection molded product is demolded, the movable movable core is extracted first, and then the product is demolded from the mold cavity or core, and the movable movable core is reset when the mold is closed. The mechanism for completing the extraction and resetting of the movable core is the core pulling mechanism.

[0036] Please refer to Figures 1 to 5 The embodiment of the present application provides a core pulling mechanism with anti-backoff function, which comprises: a driving assembly 1, a transmission assembly 4 in transmission connection with the driving assembly 1, a forming assembly 3 connected to the transmission assembly 4, and limiting assemblies 2 connected to both sides of the transmission assembly 4 respectively, wherein the transmission assembly 4 is provided with a second locking piece 44, and the limiting assembly 2 is provided with an anti-backoff part 23 corresponding to the second locking piece 44. When the driving assembly 1 drives the transmission assembly 4 to the first position, the anti-backoff part 23 abuts against the second locking piece 44. When the driving assembly 1 drives the transmission assembly 4 to the second position, the anti-backoff part 23 is clamped with the second locking piece 44, so that the core pulling mechanism is in a locked state.

[0037] Specifically, when the mold is closed, the driving assembly 1 drives the transmission assembly 4 to move along the X direction, when the second locking part 44 arranged on the transmission assembly 4 abuts against the anti-backup part 23 arranged on the limiting assembly 2, the driving assembly 1 continues to drive the transmission assembly 4 to move along the X direction, when the forming assembly 3 moves to the mold cavity, the second locking part 44 is clamped with the anti-backup part 23 so that the transmission assembly 4 is interlocked with the limiting assembly 2, and the core pulling mechanism is in the locked state. When injection molding, the mold cavity has a large injection pressure, under the action of the injection pressure, the forming assembly 3 has a tendency to move in the direction opposite to the X direction. When the injection pressure is greater than the driving force generated by the driving assembly 1, the core pulling mechanism is in the locked state due to the clamping of the second locking part 44 and the anti-backup part 23, the transmission assembly 4 will not move in the direction opposite to the X direction to make the forming assembly 3 retreat from the mold cavity, so that the injection product produced by the mold will not have the phenomena of flash, burr, burr and the like, and the quality of the injection product is ensured. Compared with the prior art, the core pulling mechanism with the anti-backup function provided by the present application is in the locked state when the second locking part 44 arranged on the transmission assembly 4 is clamped with the anti-backup part 23 arranged on the limiting assembly 2 during mold closing, and when injection molding is performed, the forming assembly 3 does not retreat due to excessive injection pressure, so that the injection product produced by the mold will not have the phenomena of flash, burr, burr and the like, and the quality of the injection product is ensured.

[0038] In the embodiment, the first position is the position of the transmission assembly 4 when the second locking part 44 abuts against the anti-backup part 23 (i.e. the non-locked state), and the second position is the position of the transmission assembly 4 when the second locking part 44 is clamped with the anti-backup part 23 (i.e. the locked state).

[0039] As shown in Figure 4 , the present application also provides another embodiment, the second locking part 44 is arranged on both sides of the transmission assembly 4, and the limiting assembly 2 connected to both sides of the transmission assembly 4 is provided with the anti-backup part 23, when the mold is closed, the second locking part 44 is clamped with the anti-backup part 23, and the stability of the core pulling mechanism in the locked state is improved.

[0040] Please refer to Figure 3 , the limiting assembly 2 comprises a limiting seat 21, the limiting seat 21 is provided with a guide groove 211, and the anti-backup part 23 is connected to the guide groove 211.

[0041] Specifically, when the forming assembly 3 is subjected to the injection pressure and drives the transmission assembly 4 to move in the direction opposite to the X direction, since the second locking part 44 is clamped with the anti-backup part 23 during mold closing so that the core pulling mechanism is in the locked state, the transmission assembly 4 will not displace in the direction opposite to the X direction, and the injection product produced by the mold has better quality.

[0042] Please refer to Figure 3 and Figure 5The anti-back-off component 23 comprises a pressing plate 231, an elastic member 232 and a first locking member 233, the pressing plate 231 is connected with the limiting seat 21, one end of the elastic member 232 is connected with the pressing plate 231, the other end of the elastic member 232 is connected with the first locking member 233, and the first locking member 233 is movably arranged in the guide groove 211.

[0043] Specifically, when the driving assembly 1 drives the transmission assembly 4 to move along the X direction to the first position, the second locking member 44 abuts against the first locking member 233, the driving assembly 1 continues to drive the transmission assembly 4 to move along the X direction, under the action of the driving assembly 1, the elastic member 232 is compressed, and the first locking member 233 is limited to move in the width direction of the limiting seat 21. When the driving assembly 1 drives the transmission assembly to move along the X direction to the second position, the elastic member 232 is elongated, the first locking member 233 is clamped with the second locking member 44, and the core pulling mechanism is in the locked state.

[0044] Please refer to Figure 3 and Figure 5 The anti-back-off component 23 further comprises a sleeve 234, the elastic member 232 is sleeved on the sleeve 234, the sleeve 234 is connected with the pressing plate 231, and in the above manner, when the elastic member 232 and the pressing plate 231 or the first locking member 233 fall off, the first locking member 233 can move in the width direction of the limiting seat 21.

[0045] Please refer to Figure 3 The first locking member 233 is provided with a locking groove 2331, and the second locking member 44 is clamped in the locking groove 2331 when the driving assembly 1 drives the transmission assembly 4 to the second position.

[0046] Specifically, in the embodiment, the second locking member 44 is wedge-shaped. The first locking member 233 is provided with a guide surface 2332, and the second locking member 44 is provided with a first inclined surface 441 and a second inclined surface 442. When the driving assembly 1 drives the transmission assembly 4 to move along the X direction to the first position, the first inclined surface 441 of the second locking member 44 abuts against the guide surface 2332 of the first locking member 233, the driving assembly 1 continues to drive the transmission assembly 4 to move along the X direction, so that the first locking member 233 moves in the width direction of the limiting seat 21, and when the driving assembly 1 drives the transmission assembly 4 to the second position, the second inclined surface 442 of the second locking member 44 abuts against the groove surface of the locking groove 2331.

[0047] Please refer to Figure 3 The first locking member 233 is provided with a baffle 235, and the guide groove 211 is provided with a stop portion 22 corresponding to the baffle 235, and the baffle 235 abuts against the stop portion 22.

[0048] Specifically, the guide groove 211 is provided with a stop portion 22, and the first locking member 233 is provided with a baffle 235 for limiting the moving stroke of the first locking member 233.

[0049] Please refer to Figure 2 and Figure 5 , the transmission assembly 4 comprises a first transmission seat 41 and a second transmission seat 42, the first transmission seat 41 is in sliding connection with the limiting seat 21, the first transmission seat 41 is provided with a containing cavity 412 and an open slot 411, the containing cavity 412 is in communication with the open slot 411, the second transmission seat 42 is located in the containing cavity 412, the second transmission seat 42 is in transmission connection with the driving assembly 1, the second locking member 44 is connected to the second transmission seat 42, and the second locking member 44 is movably arranged in the open slot 411.

[0050] Specifically, the open slot 411 is arranged on the side wall of the first transmission seat 41. The open slot 411 is composed of a vertical open slot 4111 and a horizontal open slot 4112, the vertical open slot 4111 and the horizontal open slot 4112 are in communication, and the cross section of the open slot 411 is T-shaped. When the mold is closed, the driving assembly 1 drives the transmission assembly 4 to move along the X direction, when the second locking member 44 on the second transmission seat 42 abuts against the first locking assembly, the driving assembly 1 continues to drive the transmission assembly 4 to move along the X direction, the second locking member 44 moves from the vertical open slot 4111 to the horizontal open slot 4112 along the X direction, and when the second locking member 44 is clamped with the first locking member 233, the first locking member 233 is inserted into the horizontal open slot 4112, at this time, the forming assembly 3 is inserted into the mold cavity and the core pulling mechanism is in the locking state. When the mold is opened, the driving assembly 1 drives the second transmission seat 42 to move in the direction opposite to the X direction, the second locking member 44 moves from the horizontal open slot 4112 to the vertical open slot 4111, so that the first locking member 233 is pulled out of the vertical open slot 4111. The driving assembly 1 continues to drive the second transmission seat 42 to move in the direction opposite to the X direction. When the first locking member 233 is completely arranged in the guide groove 211, the first transmission seat 41 moves in the direction opposite to the X direction, so that the forming assembly 3 is withdrawn from the mold cavity.

[0051] Please refer to Figure 4 and Figure 5 , the first transmission seat 41 is further provided with a mounting slot 413, and the forming assembly 3 is connected to the mounting slot 413.

[0052] Specifically, the forming assembly 3 comprises an insert 31 and a connecting plate 32 connected to the insert 31, and the connecting plate 32 is connected to the mounting slot 413. When the mold is closed, the driving assembly 1 drives the transmission assembly 4 to move along the X direction, so that the insert 31 enters the mold cavity. When the mold is opened, the driving assembly 1 drives the transmission assembly 4 to move in the direction opposite to the X direction, so that the insert 31 is withdrawn from the mold cavity.

[0053] Please refer toFigure 2 The transmission assembly 4 further comprises a pressing strip 43 connected to the first transmission seat 41, which is used to limit the movement direction of the second transmission seat 42.

[0054] Specifically, the pressing strip 43 is connected to the first transmission seat 41, which is used to limit the forward or reverse movement of the second transmission seat 42 in the X direction. The pressing strip 43 limits the position of the second transmission seat 42, which can improve the movement accuracy of the transmission assembly 4, and further improve the movement accuracy of the insert 31 and ensure the forming precision of the product.

[0055] Please refer to Figure 4 and Figure 5 The driving assembly 1 comprises a driving member 11 and a pull rod 12 connected to the output end of the driving member 11. One end of the pull rod 12 is connected to the output end of the driving member 11, and the other end is connected to the second transmission seat 42.

[0056] Specifically, a connecting groove 421 is provided on the second transmission, and one end of the pull rod 12 is connected to the connecting groove 421, and the other end is connected to the output end of the driving member 11. In this embodiment, the driving member 11 can be a driving oil cylinder, a driving air cylinder, or an electric cylinder.

[0057] Compared with the prior art, the core pulling mechanism with anti-backoff function provided by the present application has the second locking member 44 provided on the transmission assembly 4 and the anti-backoff component 23 provided on the limiting assembly 2 clamped to interlock the transmission assembly 4 and the limiting assembly 2 when the mold is closed, so that the core pulling mechanism is in a locked state. When injection molding is performed, the forming assembly 3 does not retreat due to excessive injection pressure, so that the injection molded product produced by the mold does not have the phenomena of flash, burr, burr, etc., thereby ensuring the quality of the injection molded product.

[0058] Please refer to Figures 6 to 8 The present application further provides an injection mold 5, which comprises a front mold 51, a rear mold 52, and a core pulling mechanism with anti-backoff function. One side of the core pulling mechanism with anti-backoff function is connected to the front mold 51, and the other side is connected to the rear mold 52.

[0059] Specifically, the front mold 51 comprises an A plate 511 and a front mold fixing plate 513 connected to the A plate 511, a flow channel 512 is arranged in the A plate 511, and a liquid injection port 5131 is arranged on the front mold fixing plate 513 and communicates with the flow channel 512. The rear mold 52 comprises a B plate 521, a rear mold support plate 522 connected to the B plate 521, a rear mold fixing plate 526 connected to the rear mold support plate 522, a first rear mold ejector plate 523 and a second rear mold ejector plate 524 connected to the rear mold fixing plate 526, the second rear mold ejector plate 524 is connected to the rear mold fixing plate 526, and the first rear mold ejector plate 523 is connected to the second rear mold ejector plate 524. A rear mold ejector pin 525 is arranged on the first rear mold ejector plate 523. The first mold core 514 is arranged in the A plate 511, and the second mold core 527 is arranged in the B plate 521, and when the mold is closed, the first mold core 514 and the second mold core 527 are closed to form a mold cavity for injection molding of a workpiece. The flow channel 512 is arranged in the A plate 511 and communicates with the mold cavity. When injection molding is performed, the plastic in a viscous flow state is injected from the injection system into the liquid injection port 5131, flows through the flow channel 512 and flows into the mold cavity for molding. At this time, since the core pulling mechanism in the application is in the locked state, it is ensured that the molding assembly 3 can still not be retracted relative to the injection mold 5 under the injection pressure, so that the quality of the injection molded product can be guaranteed.

[0060] Please refer to Figures 1 to 8 The working process of the injection mold 5 in the application is as follows:

[0061] When the mold is opened, the driving assembly 1 drives the transmission assembly 4 to move in the direction opposite to X, and at the same time, the anti-retraction part 23 moves in the width of the limiting seat 21, so that the molding assembly 3 is separated from the mold cavity. Then the front mold 51 and the rear mold 52 are separated by opening, the A plate 511 and the B plate 521 are opened, and the injection molded workpiece is ejected from the mold cavity under the action of the rear mold ejector pin 525, and the demolding is completed.

[0062] When the mold is closed, the rear mold ejector pin is reset, the front mold 51 and the rear mold 52 are buckled, the A plate 511 and the B plate 521 are closed, the driving assembly 1 drives the transmission assembly 4 to move in the X direction, and when the anti-retraction part 23 is clamped with the second locking part 44, the molding assembly 3 is placed in the mold cavity, and the mold closing is completed.

[0063] Compared with the prior art, the injection mold 5 provided by the application can ensure that the molding assembly 3 can still not be retracted relative to the injection mold 5 under the injection pressure when injection molding is performed, so that the quality of the injection molded product can be guaranteed.

[0064] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A core-pulling mechanism with anti-retraction function, characterized in that, The application relates to a core-pulling mechanism with a retreat-preventing function. The retreat-preventing component is connected to the guide groove. The retreat-preventing component comprises a pressing plate, an elastic element and a first locking element.

2. The core pulling mechanism having a retreat prevention function according to claim 1, wherein The first locking element is movably arranged in the guide groove.

3. The core pulling mechanism having a retreat prevention function according to claim 1, wherein The first locking element is provided with a locking groove. The second locking element is clamped in the locking groove when the driving assembly drives the transmission assembly to the second position.

4. The core-drawing mechanism having a retreat-preventing function according to claim 1, wherein The first locking element is provided with a baffle.

5. An injection mold characterized by, The guide groove is provided with a stop portion corresponding to the baffle. The baffle is in abutment with the stop portion. The transmission assembly comprises a first transmission seat and a second transmission seat. The first transmission seat is slidably connected with the limiting seat. The first transmission seat is provided with an accommodating cavity and an opening groove. The accommodating cavity is in communication with the opening groove. The second transmission seat is located in the accommodating cavity. The second transmission seat is in transmission connection with the driving assembly. The second locking element is connected with the second transmission seat. The second locking element is movably arranged in the opening groove. The opening groove is composed of a vertical opening groove and a horizontal opening groove. The vertical opening groove and the horizontal opening groove are in communication. The cross section of the opening groove is T-shaped. The first transmission seat is further provided with a mounting groove. The mounting groove is connected with the forming assembly. The transmission assembly further comprises: A pressing strip for limiting the movement direction of the second transmission seat. The pressing strip is connected with the first transmission seat. The driving assembly comprises a driving element and a pull rod connected with the output end of the driving element. One end of the pull rod is connected with the output end of the driving element. The other end of the pull rod is connected with the second transmission seat. The application relates to a mold. The mold comprises a front mold, a rear mold and the core-pulling mechanism with the retreat-preventing function. One side of the core-pulling mechanism with the retreat-preventing function is connected with the front mold. The other side of the core-pulling mechanism with the retreat-preventing function is connected with the rear mold.

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