Core-pulling structure for pulling inclined top in front mold

Abstract

The invention discloses a front mold inner-pulling inclined top core-pulling structure, and relates to the technical field of injection molds, the front mold inner-pulling inclined top core-pulling structure comprises a front clamping plate, a front mold plate, a rear mold plate and a rear clamping plate, a front mold core is arranged on the side, facing the rear mold plate, of the front mold plate, and an injection mold cavity is defined by the front mold core and a rear mold side part; a plurality of guide columns are arranged between the front mold plate and the rear mold plate, and a balance block is assembled on the rear clamping plate. A hot runner plate is connected right below the front clamping plate, the hot runner plate, the hot nozzle, the diverter valve body and the hot runner control box form a hot runner system, and the hot runner plate is fixed between the front clamping plate and the front mold plate. According to the core-pulling structure for pulling the inclined top in the front mold, the inclined top is directly designed for complex structures such as deep cavity inverted buckles, multi-directional side holes and irregular concave-convex grooves on the front mold side of an injection molding part, and the inclined top can be tightly attached to the front mold core and the injection molding mold cavity during mold closing through precise movement of the inclined top along a preset inclined track, so that a complete molding space is formed.

Description

Technical Field

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

[0002] In the field of injection molding, for injection molded parts with complex side holes, grooves, or undercut structures, such as appliance housings, automotive interior parts, and electronic device housings, a core-pulling mechanism is needed to remove the complex internal structure of the injection molded part before or during mold opening in order to achieve smooth demolding. Among these, the front mold internal inclined core-pulling structure is widely used in high-precision injection molds because it is suitable for the complex molding requirements of the front mold side.

[0003] Existing injection mold core-pulling mechanisms are mainly divided into two categories: rear mold core-pulling and front mold core-pulling. The rear mold core-pulling mechanism usually relies on the driving components on the rear mold plate side, such as hydraulic cylinders, air cylinders, gear racks, etc., to drive the core-pulling slider or inclined ejector to move. The structure design is simple and the assembly and maintenance are convenient. However, when there are complex structures such as deep cavity undercuts and multi-directional side holes on the front mold side of the injection molded part, the rear mold core-pulling mechanism cannot achieve accurate molding and effective demolding, which can easily lead to surface scratches, structural damage, or demolding difficulties of the injection molded part. Summary of the Invention

[0004] The purpose of this invention is to provide a front mold inner inclined core-pulling structure to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a front mold internal inclined core-pulling structure, comprising a front mounting plate, a front template, a rear template, and a rear mounting plate. A front mold core is provided on the side of the front template facing the rear template. The front mold core and the rear mold side components together form an injection mold cavity. Several guide pillars are provided between the front template and the rear template. A balance block is mounted on the rear mounting plate. A hot runner plate is connected directly below the front mounting plate. The hot runner plate, hot nozzles, a flow divider valve body, and a hot runner control box constitute a hot runner system. The hot runner plate is fixed between the front mounting plate and the front template. The hot runner control box is electrically connected to the hot runner plate and the hot nozzles. The core-pulling drive mechanism includes a hydraulic cylinder, a core-pulling slider, and a limit switch controller. The hydraulic cylinder is mounted on the side of the rear template. A timing controller is connected to one side of the hot runner plate. The timing controller is electrically connected to the hydraulic cylinder, the limit switch controller, and the hot runner control box.

[0006] As a preferred technical solution, four guide columns are provided, evenly distributed at the four corners of the front template, and the two ends of the guide columns are respectively slidably engaged with the front template and the rear template.

[0007] As a preferred technical solution, the flow divider valve body is provided with a flow divider cavity that communicates with the flow channel of the hot runner plate. The output end of the flow divider cavity is provided with several branch interfaces, and each branch interface is respectively sealed and connected to the corresponding hot nozzle.

[0008] As a preferred technical solution, the output end of the hydraulic cylinder is connected to the core-pulling slider, and the core-pulling slider is slidably embedded into the side of the injection mold cavity.

[0009] As a preferred technical solution, the core-pulling slider has a molding surface on the side facing the injection mold cavity that is adapted to the side structure of the injection molded part, and a sliding guide structure is provided between the core-pulling slider and the rear template.

[0010] As a preferred technical solution, the balance block is symmetrically fixed on the side of the rear clamping plate away from the rear template, and the thickness of the balance block is adapted to the amount of deformation of the rear clamping plate under stress.

[0011] As a preferred technical solution, the flow divider valve body is integrated into the melt output end of the hot runner plate, and the hot nozzle is connected to the flow divider channel of the hot runner plate through the flow divider valve body.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention directly addresses the complex structures of the injection molded part, such as deep cavity undercuts, multi-directional side holes, and irregular concave and convex grooves, through the front mold internal inclined ejector core-pulling structure. By precisely moving the inclined ejector along a preset inclined trajectory, it can closely fit with the front mold core and injection mold cavity during mold closing, forming a complete molding space. This solves the problem that the rear mold core-pulling mechanism cannot accurately mold due to its distance from the molding area on the front mold side and the limited movement trajectory.

[0013] 2. This invention, through the coordinated linkage of the structure with the mold's mold closing guide system and timing control system, can achieve precise matching between the core pulling action and processes such as mold closing, injection molding, and cooling, thereby improving the overall smoothness and reliability of the mold's operation. By rationally planning the installation position and movement trajectory, spatial interference between components is avoided. At the same time, some optimized designs of this structure will add heat insulation and heat dissipation components to reduce the heat transfer from the hot runner system to the core pulling mechanism, reduce the risk of component thermal deformation, and ensure the accuracy and stability of the inclined ejector movement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the three-dimensional appearance structure of the present invention; Figure 2 This is a schematic diagram of the overall side view structure of the present invention; Figure 3 This is a top view of the front mold core structure of the present invention; Figure 4 This is a schematic diagram of the connection structure between the core-pulling slider and the hydraulic cylinder of the present invention; Figure 5 This is a schematic diagram of the structure of the injection mold cavity of the present invention.

[0015] The components include: 1. Front mounting plate; 2. Hot runner plate; 3. Front mold plate; 4. Rear mold plate; 5. Rear mounting plate; 6. Timing controller; 7. Front mold core; 8. Hydraulic cylinder; 9. Hot nozzle; 10. Injection part; 11. Diverter valve body; 12. Limit switch controller; 13. Core pulling slider; 14. Hot runner control box; 15. Balance block; 16. Injection mold cavity; 17. Guide pillar. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example: Figures 1 to 5 As shown, the present invention provides the following technical solution: a front mold inward inclined core-pulling structure, including a front mounting plate 1, a front template 3, a rear template 4, and a rear mounting plate 5. A front mold core 7 is provided on the side of the front template 3 facing the rear template 4. The front mold core 7 and the rear mold side components together form an injection mold cavity 16. A plurality of guide pillars 17 are provided between the front template 3 and the rear template 4. A balance block 15 is mounted on the rear mounting plate 5. A hot runner plate 2 is connected directly below the front mounting plate 1. The hot runner plate 2, hot nozzle 9, flow divider valve body 11, and hot runner... The flow channel control box 14 constitutes a hot runner system. The hot runner plate 2 is fixed between the front mounting plate 1 and the front template 3. The hot runner control box 14 is electrically connected to the hot runner plate 2 and the hot nozzle 9. The core pulling drive mechanism includes a hydraulic cylinder 8, a core pulling slider 13, and a limit switch controller 12. The hydraulic cylinder 8 is mounted on the side of the rear template 4. A timing controller 6 is connected to one side of the hot runner plate 2. The timing controller 6 is electrically connected to the hydraulic cylinder 8, the limit switch controller 12, and the hot runner control box 14.

[0018] Among them, the hot runner plate 2, hot nozzles 9, flow divider valve body 11 and hot runner control box 14 constitute a closed-loop temperature control system, which ensures that the hot melt material is always in an ideal flow state in the flow channel, avoids premature cooling and blockage, reduces material waste, shortens the molding cycle and improves production efficiency. The flow divider valve body 11 can regulate the flow of each hot nozzle 9 to achieve uniform distribution of melt, avoid defects such as short shots or flash, and improve the consistency of product molding.

[0019] like Figure 1 , Figure 2 and Figure 3As shown, there are four guide pillars 17, evenly distributed at the four corners of the front template 3. The two ends of the guide pillars 17 are slidably engaged with the front template 3 and the rear template 4, respectively. The flow divider valve body 11 has a flow divider cavity that communicates with the flow channel of the hot runner plate 2. The output end of the flow divider cavity has several branch interfaces, and each branch interface is sealed and connected to the corresponding hot nozzle 9. The output end of the hydraulic cylinder 8 is connected to the core-pulling slider 13, and the core-pulling slider 13 is slidably embedded in the side of the injection mold cavity 16.

[0020] Among them, the timing controller 6 coordinates the actions of the hydraulic cylinder 8, the hot runner control box 14, and the limit switch controller 12 to achieve multi-system linkage. The entry and exit actions of the core-pulling slider 13 are monitored in real time by the limit switch controller 12 to ensure that it is accurately positioned or reset, avoiding mold damage or product defects caused by positional deviation, and improving the safety and stability of system operation. The balance block 15 is symmetrically arranged on the outside of the rear clamping plate 5. Its thickness is adapted to the amount of deformation under force, effectively offsetting the uneven load during the mold closing process, preventing mold warping or local stress concentration, thereby protecting the key components of the mold, extending its service life, and improving production stability.

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the core-pulling slider 13 has a molding surface on the side facing the injection mold cavity 16 that is adapted to the side structure of the injection molded part 10. A sliding guide structure is provided between the core-pulling slider 13 and the rear template 4. The balance block 15 is symmetrically fixed on the side of the rear clamping plate 5 away from the rear template 4. The thickness of the balance block 15 is adapted to the stress deformation of the rear clamping plate 5. The flow divider valve body 11 is integrated into the melt output end of the hot runner plate 2, and the hot nozzle 9 is connected to the flow divider channel of the hot runner plate 2 through the flow divider valve body 11.

[0022] Specifically, by setting the core-pulling slider 13 to precisely match the side structure of the injection mold cavity 16, it is possible to form injection molded parts 10 with complex side holes, concave and convex structures or oblique holes. Combined with the precise guiding effect of the guide post 17, the coaxiality of the front template 3 and the rear template 4 is ensured, the mold cavity fitting accuracy is improved, thereby improving the product dimensional consistency and surface quality.

[0023] The working principle of this invention is Guide pillar 17 precisely guides the front mold plate 3 and the rear mold plate 4 to ensure their coaxial fit; front clamping plate 1 and rear clamping plate 5 respectively fasten the components on the front mold side and the rear mold side to ensure the overall structural stability of the mold. After the mold is closed, the hot runner control box 14 starts working to provide stable heating for the hot runner plate 2 and the hot nozzle 9, so that the internal temperature of the hot runner system reaches the flow threshold of the hot melt material; at the same time, the timing controller 6 completes initialization, and the limit switch controller 12 enters standby state to monitor the position signal of the subsequent core-pulling slider 13; the balance block 15, through its own rigid support, offsets the off-center load generated during the mold closing process to prevent the mold plate from deforming. The injection molding machine injects molten material into the mold. The melt first enters the main channel of the hot runner plate 2, and after initial diversion through its internal flow network, it is delivered to the diversion valve body 11. The diversion valve body 11 adjusts the flow rate of each branch according to a preset program to ensure that the melt is evenly distributed to each hot nozzle 9. The melt is precisely injected into the injection cavity 16 formed by the front mold core 7 and related components of the rear mold through the hot nozzle 9. During this process, if the injection molded part 10 has complex side holes or uneven structures, the timing controller 6 will trigger the hydraulic cylinder 8 to drive the core-pulling slider 13 to move along a preset trajectory, so that the slider and the mold core fit tightly together to form a complete mold cavity shape. The limit switch controller 12 provides real-time feedback of the position signal of the core-pulling slider 13 to ensure the molding accuracy of the mold cavity. After the mold cavity is filled during the holding and cooling stage, the injection molding machine maintains a certain pressure to hold and compensate for shrinkage, preventing defects such as shrinkage cavities and depressions in the injection molded part 10 due to the cooling and shrinkage of the melt. During the holding pressure process, the hot runner control box 14 continuously maintains the temperature of the hot runner plate 2 and the hot nozzle 9 to avoid the melt in the runner solidifying and causing subsequent cleaning difficulties. At the same time, the mold cooling system is not marked in the diagram, but is the standard configuration for injection molds, which allows the injection molded part 10 in the mold cavity to gradually cool and solidify. After the injection molded part 10 is completely cured during the mold opening and demolding stage, the injection molding machine drives the mold to open. The front mold plate 3 and the rear mold plate 4 separate along the guide post 17. The mold opening action triggers the timing controller 6 to issue a command. The hydraulic cylinder 8 drives the core-pulling slider 13 to move in the opposite direction, completing the side core-pulling action and separating it from the side structure of the injection molded part 10. After the limit switch controller 12 detects that the core-pulling slider 13 has been reset, it sends a feedback signal to the injection molding machine. Then, the ejection mechanism (not shown in the diagram) ejects the injection molded part 10 from the mold cavity, completing the demolding. After demolding, the mold enters the next working cycle. The hot runner system maintains a constant temperature, waiting for the next injection command.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A front mold inner inclined core-pulling structure, comprising a front clamping plate (1), a front template (3), a rear template (4), and a rear clamping plate (5), characterized in that: The front mold plate (3) has a front mold core (7) on the side facing the rear mold plate (4). The front mold core (7) and the rear mold side component together form an injection mold cavity (16). Several guide pillars (17) are provided between the front mold plate (3) and the rear mold plate (4). A balance block (15) is mounted on the rear mounting plate (5). A hot runner plate (2) is connected directly below the front mounting plate (1). The hot runner plate (2), hot nozzle (9), flow divider valve body (11), and hot runner control box (14) constitute a hot runner system. The hot runner plate (2) is fixed to... Between the front mounting plate (1) and the front template (3), the hot runner control box (14) is electrically connected to the hot runner plate (2) and the hot nozzle (9); the core pulling drive mechanism includes a hydraulic cylinder (8), a core pulling slider (13) and a limit switch controller (12), the hydraulic cylinder (8) is mounted on the side of the rear template (4); a timing controller (6) is connected to one side of the hot runner plate (2), and the timing controller (6) is electrically connected to the hydraulic cylinder (8), the limit switch controller (12) and the hot runner control box (14) respectively.

2. The front mold inner inclined core-pulling structure according to claim 1, characterized in that: The guide post (17) has 4 posts, which are evenly distributed at the four corners of the front template (3). The two ends of the guide post (17) are respectively slidably engaged with the front template (3) and the rear template (4).

3. The front mold inner inclined core-pulling structure according to claim 2, characterized in that: The flow divider valve body (11) has a flow divider cavity inside that communicates with the flow channel of the hot runner plate (2).

4. The front mold inner inclined core-pulling structure according to claim 3, characterized in that: The output end of the flow divider is provided with several branch interfaces, and each branch interface is sealed and connected to the corresponding hot nozzle (9).

5. The front mold inner inclined core-pulling structure according to claim 4, characterized in that: The output end of the hydraulic cylinder (8) is connected to the core-pulling slider (13) for transmission, and the core-pulling slider (13) is slidably embedded in the side of the injection mold cavity (16).

6. The front mold inner inclined core-pulling structure according to claim 5, characterized in that: The core-pulling slider (13) has a molding surface on the side facing the injection mold cavity (16) that is adapted to the side structure of the injection molded part (10).

7. The front mold inner inclined core-pulling structure according to claim 6, characterized in that: A sliding guide structure is provided between the core-pulling slider (13) and the rear template (4).

8. The front mold inner inclined core-pulling structure according to claim 7, characterized in that: The balance block (15) is symmetrically fixed on the side of the rear clamping plate (5) away from the rear template (4), and the thickness of the balance block (15) is adapted to the amount of deformation of the rear clamping plate (5) under force.

9. The front mold inner inclined core-pulling structure according to claim 8, characterized in that: The flow divider valve body (11) is integrated into the melt output end of the hot runner plate (2), and the hot nozzle (9) is connected to the flow divider channel of the hot runner plate (2) through the flow divider valve body (11).

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