A front mold core-pulling mold

Abstract

The utility model relates to a front mould core-pulling mould relates to injection mould technical field, including front mould assembly and rear mould assembly and front mould core-pulling mechanism, and front mould assembly includes front mould panel, front mould plate and front mould kernel, and rear mould assembly includes rear mould seat board, rear mould plate and rear mould kernel, and is provided with the forming insert in rear mould kernel, and front mould core-pulling mechanism includes fixedly arranged on the core-pulling guide pillar of front mould panel, and the first core-pulling slider and the second core-pulling slider of core-pulling guide pillar sliding cooperation, connecting assembly and limiting assembly, and the both sides of core-pulling guide pillar are set up with the sliding slot of first core-pulling slider and second core-pulling slider sliding cooperation respectively, and first core-pulling slider and second core-pulling slider all are located in the front mould kernel and can be driven under the sliding slot on core-pulling guide pillar and move to the direction of approaching or moving away each other. Adopt above-mentioned technical scheme, can reduce the specific gravity of mould and production cost, improve production efficiency, and can improve core-pulling efficiency and demoulding effect.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a front mold inner core-pulling mold. Background Technology

[0002] In injection molding, core pulling is a crucial technology, especially for products with complex geometries. It allows certain parts of the mold to move in a specific direction during mold opening, facilitating smooth demolding of the part. When the product contains undercut structures on the inside, this part of the mold typically requires a core pulling mechanism to achieve complete demolding of the molded part.

[0003] Existing core-pulling mechanisms within the front mold typically employ a hydraulic cylinder drive. This hydraulic cylinder drive requires an additional hydraulic circuit system and related sealing elements, significantly increasing the mold's size and manufacturing cost. Furthermore, the hydraulic cylinder drive is time-consuming, severely impacting production efficiency. Some front mold core-pulling mechanisms utilize a three-plate mold combined with a slider and angled ejector core-pulling structure. However, this structure is prone to core-pulling difficulties and product sticking to the mold, thus affecting core-pulling efficiency and demolding effect.

[0004] In view of this, this application proposes a front mold core-pulling mold to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a front mold core-pulling mold that can reduce mold volume and production cost, improve production efficiency, and improve core-pulling efficiency and demolding effect.

[0006] The technical solution adopted by this utility model is: a front mold core-pulling mold, including a front mold assembly, a rear mold assembly and a front mold core-pulling mechanism. The front mold assembly includes a front mold panel, a front template and a front mold core fixed on the front template. The rear mold assembly includes a rear mold base plate, a rear template and a rear mold core fixed on the rear template. A forming insert is provided inside the rear mold core.

[0007] The front mold internal pulling mechanism includes a core-pulling guide post fixedly mounted on the front mold panel, a first core-pulling slider and a second core-pulling slider that slide and cooperate with the core-pulling guide post, a connecting component for driving the front mold plate and the rear mold plate to move synchronously during mold opening, and a limiting component for limiting the front mold plate so that the front mold plate and the rear mold plate move synchronously to a set displacement and then automatically separate. One end of the core-pulling guide post is fixedly connected to the front mold panel, and the other end of the core-pulling guide post extends into the front mold core and abuts against the molding insert. The two sides of the core-pulling guide post are respectively provided with sliding grooves that slide and cooperate with the first core-pulling slider and the second core-pulling slider. The first core-pulling slider and the second core-pulling slider are both located in the front mold core and can move towards each other or away from each other under the drive of the sliding grooves on the core-pulling guide post. The connecting component is located between the front mold plate and the rear mold plate, and the limiting component is located between the front mold panel and the front mold plate.

[0008] Optionally, the depth of the groove is set to gradually increase from the end near the front mold panel toward the end near the molding insert.

[0009] Optionally, the groove is a dovetail groove or a T-groove.

[0010] Optionally, the connecting assembly includes a rubber plug disposed between the front template and the rear template, one end of the rubber plug being fixedly connected to the rear template, and the front template having a rubber plug hole that is interference-fitted with the other end of the rubber plug.

[0011] Optionally, the limiting component includes a limiting screw hole in the front mold panel, a limiting step hole in the front template, and a limiting screw rod passing through the limiting screw hole and the limiting step hole. There is a gap between the step surface of the limiting step hole and the head of the limiting screw rod. The length of the gap is equal to the length of the preset displacement of the synchronous movement of the front mold panel and the front template when the mold is opened.

[0012] Optionally, a nitrogen spring is also provided between the front mold panel and the front template. The nitrogen spring is used to drive the front template to move away from the front mold panel. One end of the nitrogen spring is fixedly connected to the front mold panel, and the other end is fixedly connected to the front template.

[0013] Optionally, a mounting base is fixedly provided on the side of the front mold panel facing the front template, and a mounting groove for accommodating the mounting base is provided on the rear template. The end of the core-pulling guide post near the front mold panel is fixedly connected to the mounting groove, and a through hole for the core-pulling guide post to pass through is provided on the front template.

[0014] Optionally, the front mold plate is provided with at least two inclined guide pillars, and the rear mold plate is slidably provided with a first slider and a second slider. Both the first slider and the second slider are provided with inclined guide grooves for cooperating with the inclined guide pillars. The front mold core, the rear mold core, the first slider, the second slider, the molding insert, and the first core-pulling slider and the second core-pulling slider cooperate to form a molding cavity for injection molded products.

[0015] Optionally, a sprue sleeve is provided at the center of the front mold panel, and a flow channel communicating with the molding cavity is provided on the contact end face of the front mold core and the rear mold core. A glue inlet channel is provided inside the sprue sleeve. One end of the glue inlet channel is connected to the injection port of the injection molding machine, and the other end of the glue inlet channel extends into the front mold core and is connected to the flow channel.

[0016] Optionally, the number of the molding insert, core-pulling guide post, first core-pulling slider and second core-pulling slider is at least four to form at least four molding cavities. The number of the diversion channels is two, and the two diversion channels are symmetrically arranged on both sides of the glue inlet channel. The end of the diversion channel away from the glue inlet channel is connected to a glue inlet seat, and the two sides of the glue inlet seat are respectively provided with glue inlets that communicate with the two molding cavities.

[0017] After adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0018] This application sets up a front mold assembly, a rear mold assembly, and a core-pulling mechanism within the front mold. The front mold assembly includes a front mold panel, a front mold plate, and a front mold core. The rear mold assembly includes a rear mold base plate, a rear mold plate, and a rear mold core. The core-pulling mechanism within the front mold includes a core-pulling guide post, a first core-pulling slider, a second core-pulling slider, a connecting assembly, and a limiting assembly. The core-pulling guide post abuts against the molding insert within the front mold core. When the front and rear mold plates move synchronously, the core-pulling guide post drives the first and second core-pulling sliders to move closer together, achieving the core-pulling action. Compared with existing technologies, no additional hydraulic cylinder drive system is required, reducing mold volume and production costs. Simultaneously, when the front and rear mold plates move synchronously during mold opening, the first and second core-pulling sliders within the front mold core also move synchronously, meaning the core-pulling action occurs simultaneously when the front and rear mold plates move synchronously, improving production efficiency. Furthermore, the core-pulling guide post cooperates with the first and second core-pulling sliders for stable and smooth core-pulling, improving core-pulling efficiency and demolding effect. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0021] Figure 2 This is a cross-sectional view used in this embodiment to illustrate the mating relationship between the core-pulling mechanism inside the front mold, the front mold panel, and the front template.

[0022] Figure 3 This is a diagram illustrating the fit between the core-pulling guide post, the first core-pulling slider, the second core-pulling slider, and the molding insert in this embodiment.

[0023] Figure 4 This is a diagram in this embodiment illustrating the fit between the core-pulling guide post, the first core-pulling slider, the second core-pulling slider, and the molding insert after the core-pulling action is completed.

[0024] Figure 5 This is a cross-sectional view used in this embodiment to illustrate the mating relationship between the connecting components, the front template, and the rear template;

[0025] Figure 6 This is a cross-sectional view used in this embodiment to illustrate the mating relationship between the limiting component, the front mold panel, and the front template;

[0026] Figure 7 This is a cross-sectional view used in this embodiment to illustrate the mating relationship between the nitrogen spring, the front mold panel, and the front template;

[0027] Figure 8 This is a cross-sectional view in this embodiment used to illustrate the cooperation relationship between the inclined guide post, the inclined guide groove, the first forming slider, and the second forming slider;

[0028] Figure 9 This is a partial cross-sectional view in this embodiment used to illustrate the mating relationship between the glue inlet channel, the flow distribution channel, and the flow distribution seat.

[0029] Explanation of reference numerals in the attached drawings: 10. Front mold assembly; 11. Front mold panel; 111. Sprue bushing; 112. Gating channel; 12. Front mold plate; 121. Mounting base; 122. Through hole; 123. Angled guide post; 124. Runner channel; 125. Gating seat; 13. Front mold core; 20. Rear mold assembly; 21. Rear mold base plate; 22. Rear mold plate; 221. Mounting slot; 222. First slider; 223. Second... 224. Slider; 23. Rear mold core; 231. Molding insert; 30. Core pulling mechanism in front mold; 31. Core pulling guide post; 311. Slide groove; 32. First core pulling slider; 33. Second core pulling slider; 34. Connecting assembly; 341. Rubber plug; 342. Rubber plug hole; 35. Limiting assembly; 351. Limiting screw hole; 352. Limiting step hole; 353. Limiting screw; 40. Nitrogen spring. Detailed Implementation

[0030] The following will refer to the appendix in the embodiments of this utility model. Figures 1-9 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] This embodiment relates to a front mold inner core-pulling mold, referring to... Figures 1-9 The system includes a front mold assembly 10, a rear mold assembly 20, and a front mold core-pulling mechanism 30. The front mold assembly 10 includes a front mold panel 11 fixedly connected to the injection molding machine, a front mold plate 12 fixedly disposed on the side of the front mold panel 11 facing away from the injection molding machine, and a front mold core 13 fixedly disposed on the front mold plate 12. The rear mold assembly 20 includes a rear mold base plate 21, a rear mold plate 22, and a rear mold core 23 fixedly disposed on the rear mold plate 22. A molding insert 231 is disposed within the rear mold core 23. During mold closing, the front mold plate 12 and the rear mold plate 22 are tightly abutted, and the front mold core 13 and the rear mold core 23 are positioned opposite each other.

[0034] The front mold inner pulling mechanism includes a core-pulling guide post 31 fixedly mounted on the front mold panel 11, a first core-pulling slider 32 and a second core-pulling slider 33 that slide and cooperate with the core-pulling guide post 31, a connecting component 34 for driving the front mold plate 12 and the rear mold plate 22 to move synchronously during mold opening, and a limiting component 35 for limiting the front mold plate 12 so that the front mold plate 12 and the rear mold plate 22 automatically separate after moving a set displacement. One end of the core-pulling guide post 31 is fixedly connected to the front mold panel 11, and the other end of the core-pulling guide post 31 extends into the front mold core 13 and abuts against the molding insert 231. The first core-pulling slider 32 and the second core-pulling slider 33 are symmetrically arranged on both sides of the core-pulling guide post 31. The two sides of the core-pulling guide post 31 are respectively provided with sliding grooves 311 that slide and cooperate with the first core-pulling slider 32 and the second core-pulling slider 33. The first core-pulling slider 32 is located inside the front mold core 13 and can move along the length direction of the sliding groove 311 of the core-pulling guide post 31 in a direction that is closer to or farther away from each other, so as to realize core pulling in the front mold. The connecting component 34 is located between the front mold plate 12 and the rear mold plate 22, and the limiting component 35 is located between the front mold panel 11 and the front mold plate 12.

[0035] It should be noted that during mold closing, since the first inner sliding block 32 and the second inner sliding block 33 cooperate with the molding insert 231 to form an undercut on the inner side of the product, during mold opening, the first inner sliding block 32 and the second inner sliding block 33 need to be driven to move towards each other through the core-pulling guide post 31 so that the first inner sliding block 32 and the second inner sliding block 33 are separated from the injection-molded product before subsequent mold opening and ejection demolding operations can be carried out.

[0036] When the mold is opened, the rear mold assembly 20 is driven by an external driving force to move away from the front mold assembly 10. Under the action of the connecting assembly 34, the front mold plate 12 and the rear mold plate 22 move synchronously away from the front mold panel 11. The front mold plate 12 drives the front mold core 13 to move synchronously away from the front mold panel 11, thereby driving the first core-pulling slider 32 and the second core-pulling slider 33 to move. The first core-pulling slider 32 and the second core-pulling slider 33 move towards each other along the length direction of the slide groove 311. That is, when the front mold plate 12 and the rear mold plate 22 move synchronously away from the front mold panel 11, the core-pulling action is performed synchronously. After the front mold plate 12 and the rear mold plate 22 move synchronously to the set displacement, the front mold plate 12 separates from the rear mold plate 22 under the action of the limiting component 35, completing the first mold opening and the core pulling action. The first core pulling slider 32 and the second core pulling slider 33 slide towards each other to the set position and separate from the injection-molded product. Then, the rear mold assembly 20 continues to move, so that the rear mold assembly 20 is completely separated from the front mold assembly 10, completing the second mold opening, which facilitates the subsequent product ejection and demolding. The overall structure is simple, the core pulling is stable and smooth, and the core pulling efficiency and demolding effect are improved.

[0037] Furthermore, the depth of the groove 311 is gradually increased from one end near the front mold panel 11 toward the other end near the molding insert 231.

[0038] Understandably, by adopting the above-mentioned configuration, the friction between the first core-pulling slider 32 and the second core-pulling slider 33 and the sidewall of the groove 311 can be gradually reduced during the sliding process, further ensuring the smoothness of the core-pulling action. At the same time, the gradual increase in the depth of the groove 311 also provides better guidance for the sliders, making them more stable when moving towards or away from each other, and less prone to deviation or jamming.

[0039] Furthermore, the slide groove 311 is a dovetail groove or a T-groove. The dovetail or T-groove design further enhances the stability of the first core-pulling slider 32 and the second core-pulling slider 33 within the slide groove 311. This design not only effectively prevents the sliders from accidentally falling off during the sliding process but also ensures precise positioning of the sliders during the core-pulling action. Simultaneously, the structural characteristics of the dovetail or T-groove make the movement of the sliders within the slide groove 311 smoother, further improving the smoothness and efficiency of the core-pulling action.

[0040] Furthermore, the connecting component 34 includes a rubber plug 341 disposed between the front template 12 and the rear template 22. One end of the rubber plug 341 is fixedly connected to the rear template 22, and the front template 12 is provided with a rubber plug hole 342 that is interference-fitted with the other end of the rubber plug 341.

[0041] Understandably, the connecting component 34 is configured as a rubber plug 341, which is interference-fitted with the rubber plug hole 342 on the front mold plate 12. This effectively prevents the mold from loosening or deforming during use and ensures the stability and safety of the mold during high-pressure injection molding. Simultaneously, the rubber plug 341 can also separate from the front mold plate 12 as the rear mold plate 22 moves, thus achieving automatic separation after the front and rear mold plates 12 move synchronously to a set displacement, ensuring the normal operation of subsequent mold opening actions.

[0042] Furthermore, the limiting component 35 includes a limiting screw hole 351 opened in the front mold panel 11, a limiting step hole 352 opened in the front template 12, and a limiting screw 353 passing through the limiting screw hole 351 and the limiting step hole 352. There is a gap between the step surface of the limiting step hole 352 and the head of the limiting screw 353. The length of the gap is equal to the length of the preset displacement of the front mold panel 11 and the front template 12 moving synchronously when the mold is opened.

[0043] Understandably, due to the gap between the stepped surface of the limiting step hole 352 and the head of the limiting screw 353, when the front mold plate 12 and the rear mold plate 22 move synchronously, the stepped surface of the limiting step hole 352 moves towards the head of the limiting screw 353. When the stepped surface of the limiting step hole 352 abuts against the head of the limiting screw 353, it forms a limit on the front mold plate 12, preventing the front mold plate 12 from continuing to move synchronously with the rear mold plate 22. At this time, the rear mold plate 22 continues to move under the action of external driving force, causing the rubber plug 341 between the rear mold plate 22 and the front mold plate 12 to separate from the front mold plate 12, completing one mold opening.

[0044] Furthermore, a nitrogen spring 40 is provided between the front template 12 and the rear template 22. The nitrogen spring 40 is used to drive the front template 12 to move away from the front mold panel 11. One end of the nitrogen spring 40 is fixedly connected to the front mold panel 11, and the other end is fixedly connected to the front template 12.

[0045] Understandably, the nitrogen spring 40 provides a stable driving force for the front mold plate 12 during mold opening. This accelerates the synchronous movement of the front mold plate 12 and the rear mold plate 22, increasing the core-pulling speed. Furthermore, it ensures that the front mold plate 12, after completing its preset displacement under the constraint of the limiting component 35, can smoothly separate from the front mold panel 11. Simultaneously, the driving force of the nitrogen spring 40 can be controlled by adjusting its internal nitrogen pressure, thereby achieving precise regulation of the moving speed and force of the front mold plate 12, improving the mold opening efficiency and stability.

[0046] Furthermore, a mounting base 121 is fixedly provided on the side of the front mold panel 11 facing the front template 12. The front template 12 is provided with a mounting groove 221 for accommodating the mounting base 121. One end of the core-pulling guide post 31 near the front mold panel 11 is fixedly connected to the mounting base 12, and the front template 12 is provided with a through hole 122 for the core-pulling guide post 31 to pass through.

[0047] Understandably, the fixed connection between the core-pulling guide post 31 and the mounting slot 221 via the mounting base 121 ensures the stability and accuracy of the core-pulling guide post 31 during mold operation. The tight fit between the mounting base 121 and the mounting slot 221 effectively prevents the core-pulling guide post 31 from shifting or shaking during the core-pulling process, thereby ensuring the molding quality of the product. At the same time, the through hole 122 provides the necessary space for the smooth movement of the core-pulling guide post 31, allowing the core-pulling action to proceed smoothly.

[0048] Furthermore, at least two inclined guide pillars 123 are provided on the front mold plate 12, and a first slider 222 and a second slider 223 are slidably provided on the rear mold plate 22. Both the first slider 222 and the second slider 223 are provided with inclined guide grooves 224 for cooperating with the inclined guide pillars 123. The front mold core 13, the rear mold core 23, the first slider 222, the second slider 223, the molding insert 231, and the first core-pulling slider 32 and the second core-pulling slider 33 cooperate to form a molding cavity for injection molded products.

[0049] Understandably, the design of the inclined guide post 123 and the inclined guide groove 224 allows the first slider 222 and the second slider 223 to slide along the inclined direction of the inclined guide post 123 during the mold opening and closing process, thereby realizing secondary mold opening and facilitating the ejection and demolding of subsequent products.

[0050] In this embodiment, there are four inclined guide pillars 123 and four inclined guide grooves 224. The four inclined guide pillars 123 and the inclined guide grooves 224 are matched one-to-one, so that when the mold is opened for the second time, the first slider 222 and the second slider 223 can move stably in the direction of moving closer or further away from each other, thereby improving the demolding accuracy.

[0051] Furthermore, a sprue sleeve 111 is provided at the center of the front mold panel 11, and a flow channel 124 communicating with the molding cavity is provided on the contact surface between the front mold core 13 and the rear mold core 23. A glue inlet channel 112 is provided inside the sprue sleeve 111, and the glue inlet channel 112 extends into the front mold core 13 and communicates with the flow channel 124.

[0052] Understandably, the sprue bushing 111 ensures that the injection molding material can enter the molding cavity accurately and stably, providing the necessary material supply for product molding. At the same time, the design of the flow channel 124 allows the injection molding material to be evenly and quickly distributed in the molding cavity, avoiding material accumulation or missing parts, thereby ensuring the molding quality and consistency of the product.

[0053] Furthermore, the number of molding inserts 231, core-pulling guide posts 31, first core-pulling sliders 32 and second core-pulling sliders 33 is at least four, to form at least four molding cavities. The number of diversion channels 124 is two, and the two diversion channels 124 are centrally symmetrically arranged on both sides of the glue inlet channel 112. The end of the diversion channel 124 away from the glue inlet channel 112 is connected to the glue inlet seat 125. The glue inlet seat 125 is provided with glue inlets on both sides that communicate with the two molding cavities.

[0054] Understandably, setting the number of molding inserts 231, core-pulling guide pillars 31, first core-pulling sliders 32, and second core-pulling sliders 33 to at least four can greatly improve production efficiency while ensuring that the products in each molding cavity achieve the same molding quality and dimensional accuracy. The two flow channels 124 are symmetrically arranged on both sides of the injection channel 112, ensuring that the injection material is evenly distributed to each molding cavity, further guaranteeing product consistency and stability. The injection seat 125 allows the injection material to enter the molding cavity more smoothly, avoiding resistance and loss during material flow, thereby improving material utilization and product molding quality.

[0055] The working principle of this utility model is roughly as follows: When it is necessary to open the mold and remove the product, the rear mold assembly 20 is first driven by an external driving force to move away from the front mold assembly 10. Under the action of the connecting assembly 34, the front mold plate 12 and the rear mold plate 22 move synchronously away from the front mold panel 11. At this time, the front mold plate 12 drives the front mold core 13 and the first core-pulling slider 32 and the second core-pulling slider 33 installed in the front mold core 13 to move synchronously. With the synchronous movement of the front mold plate 12 and the rear mold plate 22, the first core-pulling slider 32 and the second core-pulling slider 33 gradually move towards each other under the guidance of the core-pulling guide post 31, realizing the core-pulling action. After the front mold plate 12 and the rear mold plate 22 have moved to a set displacement, the limiting assembly 35 plays a role, causing the front mold plate 12 to separate from the rear mold plate 22, completing the first mold opening. At this time, the core-pulling action is completed, and the first core-pulling slider 32 and the second core-pulling slider 33 are separated from the injection-molded product. Subsequently, the rear mold assembly 20 is driven to move, so that the rear mold assembly 20 is completely separated from the front mold assembly 10, completing the second mold opening. During the secondary mold opening process, the cooperation between the inclined guide post 123 and the inclined guide groove 224 enables the first slider 222 and the second slider 223 to move stably in a direction away from each other, thereby further opening the molding cavity and facilitating subsequent product ejection and demolding.

[0056] The above is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A front core-pulling mold characterized by comprising: The system includes a front mold assembly (10), a rear mold assembly (20), and a front mold core-pulling mechanism (30). The front mold assembly (10) includes a front mold panel (11), a front template (12), and a front mold core (13) fixed on the front template (12). The rear mold assembly (20) includes a rear mold base plate (21), a rear template (22), and a rear mold core (23) fixed on the rear template (22). A molding insert (231) is provided inside the rear mold core (23). The front mold internal pulling mechanism includes a core-pulling guide post (31), a first core-pulling slider (32) and a second core-pulling slider (33) that slide and cooperate with the core-pulling guide post (31), a connecting component (34) for driving the front template (12) and the rear template (22) to move synchronously during mold opening, and a limiting component (35) for limiting the front template (12) so that the front template (12) and the rear template (22) move synchronously to a set displacement and then automatically separate. One end of the core-pulling guide post (31) is fixedly connected to the front mold panel (11), and the other end of the core-pulling guide post (31) extends into the front mold core (13). It abuts against the molding insert (231). The two sides of the core-pulling guide post (31) are respectively provided with sliding grooves (311) that slide and cooperate with the first core-pulling slider (32) and the second core-pulling slider (33). The first core-pulling slider (32) and the second core-pulling slider (33) are both located in the front mold core (13) and can move towards each other or away from each other under the drive of the sliding grooves (311) on the core-pulling guide post (31). The connecting component (34) is located between the front template (12) and the rear template (22). The limiting component (35) is located between the front mold panel (11) and the front template (12).

2. A positive draft core back mold as defined in claim 1 wherein, The depth of the groove (311) gradually increases from one end near the front mold panel (11) toward the other end near the molding insert (231).

3. A positive draft core back mold as defined in claim 2 wherein, The groove (311) is a dovetail groove or a T-shaped groove.

4. A positive draft core backer mold in accordance with claim 1 wherein, The connecting assembly (34) includes a rubber plug (341) disposed between the front template (12) and the rear template (22). One end of the rubber plug (341) is fixedly connected to the rear template (22), and the front template (12) is provided with a rubber plug hole (342) that is interference-fitted with the other end of the rubber plug (341).

5. A front mold inner core-pulling mold according to claim 1, characterized in that, The limiting component (35) includes a limiting screw hole (351) opened in the front mold panel (11), a limiting step hole (352) opened in the front template (12), and a limiting screw (353) passing through the limiting screw hole (351) and the limiting step hole (352). There is a gap between the step surface of the limiting step hole (352) and the head of the limiting screw (353). The length of the gap is equal to the length of the preset displacement of the synchronous movement of the front mold panel (11) and the front template (12) when the mold is opened.

6. The front mold inner core-pulling mold according to claim 1, characterized in that, A nitrogen spring (40) is also provided between the front mold panel (11) and the front template (12). The nitrogen spring (40) is used to drive the front template (12) to move away from the front mold panel (11). One end of the nitrogen spring (40) is fixedly connected to the front mold panel (11), and the other end is fixedly connected to the front template (12).

7. A front mold inner core-pulling mold according to claim 1, characterized in that, A mounting base (121) is fixedly provided on the side of the front mold panel (11) facing the front template (12). The front template (12) has a mounting groove (221) for accommodating the mounting base (121). One end of the core-pulling guide post (31) near the front mold panel (11) is fixedly connected to the mounting base (121), and the front template (12) has a through hole (122) for the core-pulling guide post (31) to pass through.

8. A front mold inner core-pulling mold according to claim 1, characterized in that, The front mold plate (12) is provided with at least two inclined guide pillars (123), and the rear mold plate (22) is slidably provided with a first slider (222) and a second slider (223). The first slider (222) and the second slider (223) are both provided with inclined guide grooves (224) for cooperating with the inclined guide pillars (123). The front mold core (13), the rear mold core (23), the first slider (222), the second slider (223), the molding insert (231), the first core-pulling slider (32), and the second core-pulling slider (33) cooperate to form a molding cavity for injection molding products.

9. A front mold inner core-pulling mold according to claim 8, characterized in that, A sprue sleeve (111) is provided at the center of the front mold panel (11). A flow channel (124) communicating with the molding cavity is provided on the contact end face of the front mold core (13) and the rear mold core (23). A glue inlet channel (112) is provided inside the sprue sleeve (111). One end of the glue inlet channel (112) is connected to the injection port of the injection molding machine, and the other end of the glue inlet channel (112) extends into the front mold core (13) and communicates with the flow channel (124).

10. A front mold inner core-pulling mold according to claim 9, characterized in that, The number of the molding insert (231), the core-pulling guide post (31), the first core-pulling slider (32) and the second core-pulling slider (33) is at least four, so as to form at least four molding cavities. The number of the diversion channels (124) is two, and the two diversion channels (124) are symmetrically arranged on both sides of the glue inlet channel (112). The end of the diversion channel (124) away from the glue inlet channel (112) is connected to the glue inlet seat (125). The glue inlet seat (125) is provided with glue inlets on both sides that are connected to the two molding cavities.

Images