A three-plate injection mold

Abstract

This utility model discloses a three-plate injection mold, relating to the field of injection mold technology. It includes a front fixed seat, a stripper plate, a fixed template, a limiting bolt, and a small tie rod. The front fixed seat has an axial limiting hole. The limiting bolt is axially slidably disposed within the axial limiting hole and passes through the stripper plate, threadedly connected to the small tie rod. The fixed template is slidably sleeved on the small tie rod. The three-plate injection mold further includes an anti-rotation structure to prevent the limiting bolt from rotating within the axial limiting hole. The three-plate injection mold provided by this utility model facilitates the disassembly of the small tie rod and the limiting bolt, solving the problem of the inability to quickly and directly disassemble them, thus improving work efficiency and reducing production costs.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a three-plate injection mold. Background Technology

[0002] Three-platen injection molds are key tools in the plastic molding industry. During normal production, the sprue is pulled out from the fixed platen, and then the robotic arm on the injection molding machine removes the sprue between the fixed platen and the stripper plate. However, in actual trial molding or production, the sprue often breaks inside the fixed platen due to insufficient drying of the raw material, excessively high proportion of recycled material, unstable molding parameters, etc. (e.g., ...). Figure 1 As shown in the figure, this requires manual removal of the broken material from the fixed mold plate. However, due to the limiting effect of the small tie rod and the limiting bolt, the mold opening distance between the fixed mold plate and the stripper plate is small (increasing it may affect the mold opening distance between the moving mold plate and the fixed mold plate, thus affecting the product removal). Therefore, it is difficult to remove the broken material from the fixed mold plate.

[0003] Currently, when encountering the problem of material breaking off in the fixed mold platen, it is usually necessary to first disassemble the small tie rod and the limiting bolt, then increase the distance between the fixed mold platen and the stripper plate, and then manually remove the broken material from the fixed mold platen. However, the bolt heads of the limiting bolts in existing three-platen injection molds are usually cylindrical. When directly disassembling the small tie rod and the limiting bolt, the small tie rod and the limiting bolt will rotate simultaneously, making it impossible to quickly and directly disassemble them. The existing method is to remove the mold from the injection molding machine and then disassemble the small tie rod and the limiting bolt. Although this method can achieve the disassembly of the small tie rod and the limiting bolt and increase the distance between the fixed mold platen and the stripper plate to facilitate the removal of material, it has the problems of low work efficiency and high cost. Utility Model Content

[0004] To address the aforementioned deficiencies in existing technologies, this utility model provides a three-plate injection mold. This three-plate injection mold facilitates the disassembly of the small tie rod and the limiting bolt, solving the problem that the small tie rod and the limiting bolt cannot be quickly and directly disassembled, thereby improving work efficiency and reducing production costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A three-plate injection mold includes a front fixed seat, a stripper plate, a fixed template, a limiting bolt, and a small tie rod. The front fixed seat is provided with an axial limiting hole. The limiting bolt is axially slidably disposed in the axial limiting hole and passes through the stripper plate and is threadedly connected to the small tie rod. The fixed template is slidably sleeved on the small tie rod. The three-plate injection mold also includes an anti-rotation structure to prevent the limiting bolt from rotating in the axial limiting hole.

[0007] The limiting bolt includes a bolt head with a cutting portion, and the axial limiting hole includes a first contoured hole section adapted to the bolt head. The cutting portion and the first contoured hole section constitute the anti-rotation structure.

[0008] The bolt head is provided with two cutting parts, which are symmetrically arranged on the bolt head.

[0009] The limiting bolt further includes a screw portion and a limiting rod portion. The screw portion, the limiting rod portion, and the bolt head are connected sequentially and arranged in a stepped manner. The screw portion is used to pass through the stripper plate and be threadedly connected to the small pull rod. The limiting rod portion is used to cooperate with the small pull rod to fix the stripper plate. The axial limiting hole further includes a second contoured hole section adapted to the limiting rod portion. The second contoured hole section is arranged in a stepped manner with the first contoured hole section.

[0010] The front fixed seat is provided with a large pull rod parallel to the small pull rod, and the stripper plate and the fixed template are slidably sleeved on the large pull rod.

[0011] The front fixing seat includes a front fixing plate and an upper fixing plate disposed on the front fixing plate. The upper fixing plate and the front fixing plate together form a stepped mounting hole and the axial limiting hole. The large tie rod is installed in the stepped mounting hole.

[0012] An elastic element is sleeved on the small pull rod, and the elastic element is located between the fixed template and the stripper plate.

[0013] The front fixed seat is provided with a sprue sleeve and a pull pin. When the mold is closed, the stripper plate and the fixed mold plate together form a flow channel that is connected to the product cavity. The sprue sleeve is connected to the flow channel, and the pull pin extends into the flow channel.

[0014] The three-plate injection mold further includes a rear fixed seat, a movable platen disposed on the rear fixed seat, and an ejection mechanism disposed within the rear fixed seat. The movable platen is used to form the product cavity together with the fixed platen, and an opening and closing device is provided between the movable platen and the fixed platen. The ejection mechanism is used to eject the product on the movable platen when the mold is opened.

[0015] The ejection mechanism includes an ejection seat and an ejector pin disposed on the ejection seat. The ejection seat is slidably disposed within the rear fixed seat, and the ejector pin is slidably disposed within the moving template.

[0016] By adopting the above technical solution, the beneficial effects of this utility model are:

[0017] The three-plate injection mold provided by this utility model has an anti-rotation structure to prevent the limiting bolt from rotating within the axial limiting hole. Therefore, under the action of the anti-rotation structure, the small tie rod can be quickly and directly unscrewed from the limiting bolt without disassembling the entire mold. This allows the operator to quickly increase the distance between the fixed platen and the stripper plate, smoothly removing the material from the fixed platen. Compared with the prior art, the three-plate injection mold provided by this utility model facilitates the disassembly of the small tie rod and the limiting bolt, solving the problem of the inability to quickly and directly disassemble the small tie rod and the limiting bolt. It achieves the purpose of quickly increasing the distance between the fixed platen and the stripper plate to facilitate the removal of material, improving work efficiency and reducing production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the three-plate injection mold of this utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of small and medium-sized tie rods after disassembly;

[0020] Figure 3 yes Figure 1 Schematic diagram of the middle limit bolt;

[0021] Figure 4 This is a schematic diagram of the head structure of the three types of limit bolts;

[0022] In the diagram: 1. Front fixed seat; 11. Front fixed plate; 12. Upper fixed plate; 13. Axial limiting hole; 2. Stripper plate; 3. Fixed template; 4. Limiting bolt; 41. Bolt head; 411. Cutting part; 42. Limiting rod part; 43. Screw part; 5. Small tie rod; 6. Large tie rod; 7. Elastic element; 8. Sprue sleeve; 9. Pulling pin; 10. Rear fixed seat; 14. Moving template; 15. Ejector seat; 16. Ejector pin; 17. Opener / closer; 18. Product; 19. Material scrap. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0024] like Figures 1 to 4As shown, a three-plate injection mold is disclosed. The three-plate injection mold includes a front fixed seat 1, a stripper plate 2, a fixed template 3, a limiting bolt 4, and a small tie rod 5. The front fixed seat 1 is provided with an axial limiting hole 13. The limiting bolt 4 is axially slidably disposed in the axial limiting hole 13 and passes through the stripper plate 2 and is threadedly connected to the small tie rod 5. The fixed template 3 is slidably sleeved on the small tie rod 5. The three-plate injection mold also includes an anti-rotation structure to prevent the limiting bolt 4 from rotating in the axial limiting hole 13.

[0025] Because this three-plate injection mold is equipped with an anti-rotation structure to prevent the limiting bolt 4 from rotating within the axial limiting hole 13, the small tie rod 5 can be quickly and directly unscrewed from the limiting bolt 4 without disassembling the entire mold. This allows the operator to quickly increase the distance between the fixed platen 3 and the stripper plate 2, and smoothly remove the material shavings 19 from the fixed platen 3, thereby improving work efficiency and reducing production costs.

[0026] In this embodiment, the limiting bolt 4 includes a bolt head 41 with a cutting portion 411. The axial limiting hole 13 includes a first contoured hole section that matches the bolt head 41. The cutting portion 411 and the first contoured hole section form an anti-rotation structure. By engaging the cutting portion 411 with the first contoured hole section, the limiting bolt 4 is prevented from rotating. This anti-rotation design, combining the cutting portion 411 with the first contoured hole section, is not only an efficient mechanical anti-rotation solution but also significantly reduces production costs.

[0027] In this embodiment, two cutting portions 411 are provided, and the two cutting portions 411 are symmetrically arranged on the bolt head 41. Specifically, two cutting portions 411 are formed by cutting both sides of the bolt head 41, making the bolt head 41 waist-shaped. Correspondingly, the first contour hole section is a waist-shaped hole that matches the bolt head 41. With this design, the two straight surfaces of the first contour hole section will form a force couple to resist the rotation of the bolt head 41, further improving the anti-rotation effect.

[0028] In this embodiment, the limiting bolt 4 also includes a screw portion 43 and a limiting rod portion 42. The screw portion 43, the limiting rod portion 42, and the bolt head 41 are connected sequentially and arranged in a stepped manner. The screw portion 43 is used to pass through the stripper plate 2 and be threadedly connected to the small pull rod 5. The limiting rod portion 42 is used to cooperate with the small pull rod 5 to fix the stripper plate 2. The axial limiting hole 13 also includes a second contoured hole section adapted to the limiting rod portion 42. The second contoured hole section is arranged in a stepped manner with the first contoured hole section. In actual use, the cutting part 411 can also be provided on the limiting rod portion 42. The limiting rod portion 42 cooperates with the second contoured hole section to prevent the limiting bolt 4 from rotating. Of course, the cutting part 411 can also be provided on both the bolt head 41 and the limiting rod portion 42. The specific choice depends on the actual needs and is not limited here.

[0029] In this embodiment, a large pull rod 6 parallel to the small pull rod 5 is provided on the front fixed seat 1. The stripper plate 2 and the fixed template 3 are slidably sleeved on the large pull rod 6. Through the guiding and limiting functions of the large pull rod 6 and the small pull rod 5, the smooth opening and closing of the fixed template 3 and the stripper plate 2 are ensured.

[0030] In this embodiment, the large tie rod 6 adopts a stepped shaft structure design. The front fixing seat 1 includes a front fixing plate 11 and an upper fixing plate 12 disposed on the front fixing plate 11. The upper fixing plate 12 and the front fixing plate 11 together form a stepped mounting hole and an axial limiting hole 13. The large tie rod 6 is installed in the stepped mounting hole. Compared with bolt connection, the large tie rod 6 and the limiting bolt 4 are connected by the cooperation of the stepped shaft and the stepped hole, which not only ensures disassembly but also improves tensile and impact resistance.

[0031] In this embodiment, an elastic element 7 is sleeved on the small pull rod 5, and the elastic element 7 is located between the fixed template 3 and the stripper plate 2. The elastic element 7 provides preload to the stripper plate 2, ensuring the mold opening sequence, that is, the fixed template 3 and the stripper plate 2 open first, and the stripper plate 2 and the front fixed seat 1 open later. Specifically, the elastic element 7 is preferably a spring.

[0032] In this embodiment, the front fixed seat 1 is provided with a sprue sleeve 8 and a pull pin 9. When the mold is closed, the stripper plate 2 and the fixed platen 3 together form a runner that communicates with the product cavity. The sprue sleeve 8 is connected to the runner, and the pull pin 9 extends into the runner. By providing the sprue sleeve 8, the smooth flow of molten plastic into the runner is ensured. By providing the pull pin 9, it is easy to pull the molten plastic 19 out of the runner when the mold is opened.

[0033] The three-plate injection mold in this embodiment also includes a rear fixed base 10, a movable platen 14 disposed on the rear fixed base 10, and an ejection mechanism disposed within the rear fixed base 10. The movable platen 14, together with the fixed platen 3, forms the product cavity, and an opening / closing device 17 is disposed between the movable platen 14 and the fixed platen 3. The ejection mechanism is used to eject the product 18 from the movable platen 14 during mold opening. By setting the opening / closing device 17, the orderly opening sequence of the three-plate injection mold is ensured; by setting the ejection mechanism, the smooth demolding of the product 18 is ensured.

[0034] Specifically, the opening and closing device 17 is disposed on the moving template 14, and the ejection mechanism includes an ejection seat 15 and an ejector pin 16 disposed on the ejection seat 15. The ejection seat 15 is slidably disposed in the rear fixed seat 10, and the ejector pin 16 is slidably disposed in the moving template 14.

[0035] After the mold is opened, if the material 19 breaks inside the fixed mold plate 3, the workers can quickly unscrew the small tie rod 5 from the limit bolt 4 under the action of the anti-rotation structure, then separate the fixed mold plate 3 and the stripper plate 2 to increase the distance between them, and then take out the material 19 that broke inside the fixed mold plate 3.

[0036] The above describes in detail a preferred embodiment of the three-plate injection mold of this utility model. Many other embodiments are also described but will not be elaborated upon here. In summary, the three-plate injection mold provided by this utility model facilitates the disassembly of the small tie rod 5 and the limiting bolt 4, solving the problem that the small tie rod 5 and the limiting bolt 4 cannot be quickly and directly disassembled. This achieves the purpose of quickly increasing the distance between the fixed platen 3 and the stripper plate 2 to facilitate the removal of material residue 19, thereby improving work efficiency and reducing production costs.

[0037] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. A three-plate injection mold, characterized in that, The mold includes a front fixed seat, a stripper plate, a fixed template, a limiting bolt, and a small tie rod. The front fixed seat is provided with an axial limiting hole. The limiting bolt is axially slidably disposed in the axial limiting hole and passes through the stripper plate and is threadedly connected to the small tie rod. The fixed template is slidably sleeved on the small tie rod. The three-plate injection mold also includes an anti-rotation structure, which is used to prevent the limiting bolt from rotating in the axial limiting hole.

2. The three-plate injection mold according to claim 1, characterized in that, The limiting bolt includes a bolt head with a cutting portion, and the axial limiting hole includes a first contoured hole section adapted to the bolt head. The cutting portion and the first contoured hole section constitute the anti-rotation structure.

3. The three-plate injection mold according to claim 2, characterized in that, The bolt head is provided with two cutting parts, which are symmetrically arranged on the bolt head.

4. The three-plate injection mold according to claim 2, characterized in that, The limiting bolt further includes a screw portion and a limiting rod portion. The screw portion, the limiting rod portion, and the bolt head are connected sequentially and arranged in a stepped manner. The screw portion is used to pass through the stripper plate and be threadedly connected to the small pull rod. The limiting rod portion is used to cooperate with the small pull rod to fix the stripper plate. The axial limiting hole further includes a second contoured hole section adapted to the limiting rod portion. The second contoured hole section is arranged in a stepped manner with the first contoured hole section.

5. The three-plate injection mold according to claim 1, characterized in that, The front fixed seat is provided with a large pull rod parallel to the small pull rod, and the stripper plate and the fixed template are slidably sleeved on the large pull rod.

6. The three-plate injection mold according to claim 5, characterized in that, The front fixing seat includes a front fixing plate and an upper fixing plate disposed on the front fixing plate. The upper fixing plate and the front fixing plate together form a stepped mounting hole and the axial limiting hole. The large tie rod is installed in the stepped mounting hole.

7. The three-plate injection mold according to claim 1, characterized in that, An elastic element is fitted onto the small pull rod, and the elastic element is located between the fixed template and the stripper plate.

8. The three-plate injection mold according to claim 1, characterized in that, The front fixed seat is provided with a sprue sleeve and a pull pin. When the mold is closed, the stripper plate and the fixed plate form a runner that communicates with the product cavity. The sprue sleeve is connected to the runner, and the pull pin extends into the runner.

9. The three-plate injection mold according to claim 8, characterized in that, The three-plate injection mold further includes a rear fixed base, a movable platen disposed on the rear fixed base, and an ejection mechanism disposed within the rear fixed base. The movable platen is used to form the product cavity together with the fixed platen, and an opening and closing device is provided between the movable platen and the fixed platen. The ejection mechanism is used to eject the product on the movable platen when the mold is opened.

10. The three-plate injection mold according to claim 9, characterized in that, The ejection mechanism includes an ejection seat and an ejector pin disposed on the ejection seat. The ejection seat is slidably disposed within the rear fixed seat, and the ejector pin is slidably disposed within the moving template.

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