Plastic extrusion die for soft PVC (polyvinyl chloride) water-stop belt

Abstract

The utility model discloses a soft polyvinyl chloride (PVC) waterstop plastic extrusion die which comprises an upper die, a lower die and a firefield car coupler, the lower die is arranged below the upper die, the firefield car couplers are arranged on the two sides of the upper die and the two sides of the lower die respectively, each firefield car coupler is composed of an upper clamping hook and a lower clamping hook which are consistent in structure, and the upper clamping hook is connected with the lower clamping hook. Two symmetrical upper clamping hooks are arranged on the outer walls of the two sides of the upper mold, and two symmetrical lower clamping hooks are arranged on the outer walls of the two sides of the lower mold. According to the device, traditional threaded connection is replaced with the firefield car coupler, the effects of rapid and automatic die assembly and stable and reliable locking of the die are achieved, and the problems that an existing device lacks an efficient and automatic locking function and is insufficient in die assembly stability are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of material processing, specifically to a plastic extrusion mold for soft PVC waterstops. Background Technology

[0002] In the traditional field of manufacturing extrusion molds for flexible PVC waterstops, bolt fastening or hydraulic locking is commonly used to close the mold. These traditional technologies have significant limitations: bolt fastening is cumbersome, requiring tools to tighten each bolt individually, which is time-consuming, labor-intensive, and makes it difficult to ensure uniform stress distribution; while hydraulic locking systems offer a high degree of automation, the equipment is complex, maintenance costs are high, and there is a risk of hydraulic oil leakage contaminating the product. Especially under high-temperature and high-pressure extrusion conditions, traditional locking structures are prone to stress concentration and mold deformation, affecting the dimensional accuracy and surface quality of the waterstop. Furthermore, existing molds have poor quick-change performance, making it difficult to adapt to the flexible production needs of multi-specification products. These problems severely restrict the production efficiency and quality stability of PVC waterstops, necessitating a new mold locking mechanism to overcome these technical bottlenecks.

[0003] A search revealed Chinese patent publication number CN221022255U, which discloses a stable plastic extrusion mold, including a base, a lower mold symmetrically arranged on the surface of the base, and an upper mold arranged on the surface of the lower mold. A limiting component is provided at one side connection between the lower mold and the upper mold. The limiting component consists of a limiting block and a limiting groove. The limiting block is fixed to the bottom end of one side of the upper mold, and the limiting groove is opened on one side surface of the lower mold. The limiting block is engaged with the inner side of the limiting groove. The designed limiting component improves the problem that, during the use of the original plastic extrusion mold, when the upper mold is repeatedly opened and closed, the connection between the connecting parts and the upper and lower molds becomes loose, causing the upper mold to shift after closing, resulting in instability. By setting a limiting component at one side connection between the upper and lower molds, the upper mold's position is ensured not to shift after repeated opening and closing, ensuring the stability of the upper mold after closing.

[0004] However, the device only sets a limit on one side, which can easily cause the mold to tilt; the limit block and the groove are prone to wear due to long-term friction; and the problem of mold thermal expansion is not taken into account. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a soft PVC waterstop plastic extrusion mold, which solves the problems of existing devices lacking efficient automatic locking function and insufficient mold closing stability.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a soft PVC waterstop plastic extrusion mold, including an upper mold, a lower mold, and a Shibata hook. The lower mold is provided below the upper mold, and Shibata hooks are provided on both sides of the upper and lower molds. The Shibata hook is composed of two upper hooks and lower hooks with identical structures. Two symmetrical upper hooks are provided on the outer walls of both sides of the upper mold, and two symmetrical lower hooks are provided on the outer walls of both sides of the lower mold.

[0007] Preferably, the upper hook is provided with a housing, one end of the housing is provided with a hook head, one side of the housing is provided with an arc-shaped groove, and the arc-shaped groove is provided with a hook tongue.

[0008] Preferably, the outer wall of one side of the hook tongue is fixedly connected to one end of the operating rod, a first sliding groove is provided on one side of the arc-shaped groove, a second sliding groove is provided on one side of the housing, and the operating rod extends through the second sliding groove to the outside of the housing.

[0009] Preferably, the housing has a slot located between the arc-shaped groove and the housing.

[0010] Preferably, the housing is provided with a spring, and the two ends of the spring are fixedly connected with connecting hooks. One end of the connecting hook is connected to the operating rod, and the other end of the connecting hook is connected to the inner wall of the housing.

[0011] Preferably, both the upper and lower molds are provided with two forming grooves, and the upper mold is provided with two symmetrical handles on both sides.

[0012] This utility model provides a plastic extrusion mold for a flexible PVC waterstop. It has the following beneficial effects:

[0013] First, the hook tongue and arc-shaped groove design enable automatic mold closing. When the upper and lower molds approach each other, the hook tongue automatically locks under the action of a spring, greatly simplifying the operation process. Second, the bidirectional symmetrical locking structure after mold closing provides excellent stability, effectively resisting the high pressure during extrusion and ensuring that the mold does not misalign or leak. Finally, by operating the lever connected to the hook tongue, the mold opening action is quick and convenient; simply pulling the lever releases the lock, significantly improving production efficiency. The entire system is ingeniously designed and easy to operate, ensuring molding quality while improving operational efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the molding groove structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the Shibata coupler structure of this utility model.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Handle; 2. Shibata hook; 3. Upper hook; 4. Upper mold; 5. Lower mold; 6. Lower hook; 7. Forming groove; 8. Hook tongue; 9. Spring; 10. Connecting hook; 11. Operating lever; 12. First slide groove; 13. Hook head; 14. Second slide groove; 15. Arc groove; 16. Slot; 17. Housing. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1, please refer to Figure 1-3 This utility model provides a plastic extrusion mold for a soft PVC waterstop, including an upper mold 4, a lower mold 5, and a Shibata hook 2. The lower mold 5 is located below the upper mold 4, and Shibata hooks 2 are provided on both sides of the upper mold 4 and the lower mold 5. The Shibata hook 2 consists of two identical upper hooks 3 and lower hooks 6. Two symmetrical upper hooks 3 are provided on the outer walls of both sides of the upper mold 4, and two symmetrical lower hooks 6 are provided on the outer walls of both sides of the lower mold 5. In use, the waterstop is formed by the combination of the upper mold 4 and the lower mold 5. The Shibata hook 2, as a key locking mechanism, is composed of upper hooks 3 and lower hooks 6, symmetrically distributed on both sides of the mold to ensure centering and stability when the mold is closed. The mold closing design of the upper mold 4 and the lower mold 5 facilitates maintenance and replacement, and is suitable for high-temperature extrusion processes of soft PVC materials. At the same time, the locking function of the Shibata hook 2 can withstand the high pressure during the extrusion process, preventing mold misalignment or leakage.

[0021] Example 2, please refer to Figure 1-3 In this embodiment, the upper hook 3 is provided with a housing 17, one end of the housing 17 is provided with a hook head 13, and one side of the housing 17 is provided with an arc groove 15. The arc groove 15 is provided with a hook tongue 8. In use, the arc groove 15 and the hook tongue 8 are both semi-circular concentric designs, and the inner diameter of the arc groove 15 is the same as the diameter of the hook tongue 8, ensuring that the hook tongue 8 can rotate smoothly in the arc groove 15.

[0022] One side of the hook tongue 8 is fixedly connected to one end of the operating rod 11. A first slide groove 12 is provided on one side of the arc groove 15, and a second slide groove 14 is provided on one side of the housing 17. The operating rod 11 extends through the second slide groove 14 to the outside of the housing 17. In use, the operating rod 11 is exposed through the second slide groove 14, which is convenient for manual operation or tool-assisted operation by the operator. The first slide groove 12 limits the range of movement of the hook tongue 8 to prevent excessive displacement from causing the spring 9 to fail. The first slide groove 12 and the second slide groove 14 have a guiding function to ensure that the operating rod 11 always moves along the predetermined path when subjected to force, thereby improving the reliability of the locking action.

[0023] The housing 17 has a slot 16 located between the arc groove 15 and the housing 17. During use, the connection design of the slot 16 and the arc groove 15 allows the hook tongue 8 to slide naturally into the docking position after insertion without manual intervention.

[0024] The housing 17 is equipped with a spring 9, and the two ends of the spring 9 are fixedly connected to connecting hooks 10. One end of the connecting hook 10 is connected to the operating rod 11, and the other end of the connecting hook 10 is connected to the inner wall of the housing 17. During use, the spring 9 is always in a stretched state, continuously releasing elastic tension to provide tension for the reset of the operating rod 11 and the hook tongue 8.

[0025] Both the upper mold 4 and the lower mold 5 are provided with two forming grooves 7. The upper mold 4 is provided with two symmetrical handles 1 on both sides. During use, the lower mold 5 can be fixed to the extruder outlet by bolts to ensure stability during the production process.

[0026] Instructions for use: When using this device, the operator moves the upper mold 4 by using handle 1, aligning the hook head 13 of the upper hook 3 of the upper mold 4 with the slot 16 in the lower hook 6 of the lower mold 5. As the hook head 13 extends, the arc-shaped grooves 15 of the upper hook 3 and the lower hook 6 gradually align to form a circular groove. The two hook tongues 8 push against each other to align themselves within their respective arc-shaped grooves 15. During insertion, the operating rod 11 moves along the hook tongues 8 towards the hook head 13 on the first slide groove 12 and the second slide groove 14. The spring 9 is also stretched, creating two arc-shaped grooves. After the 15 are fully connected, the spring 9 releases its elastic tension, resetting the operating rod 11. At this time, the two hooks 8 are pulled by the operating rod 11 and rotate and reset in the circular groove formed by the two arc grooves 15, so that the upper hook 3 and the lower hook 6 form a lock, thereby achieving a tight mold closing between the upper mold 4 and the lower mold 5. When opening the mold, the operator pulls down the operating rods 11 on both sides of the upper mold 4. The operating rods 11 drive the hooks 8 to rotate, and the two hooks 8 interact with each other until they are aligned with the arc grooves 15 in their respective hooks. At this time, the lock is released, and the upper mold 4 is lifted up to complete the mold opening.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A plastic extrusion mold for a soft PVC waterstop, comprising an upper mold (4), a lower mold (5), and a Shibata hook (2), wherein the lower mold (5) is provided below the upper mold (4), and the Shibata hook (2) is provided on both sides of the upper mold (4) and the lower mold (5), characterized in that: The Shibata hook (2) consists of two identical upper hooks (3) and lower hooks (6). The upper mold (4) has two symmetrical upper hooks (3) on its two outer walls, and the lower mold (5) has two symmetrical lower hooks (6) on its two outer walls.

2. The plastic extrusion mold for a flexible PVC waterstop according to claim 1, characterized in that: The upper hook (3) is provided with a housing (17), one end of the housing (17) is provided with a hook head (13), one side of the housing (17) is provided with an arc groove (15), and the arc groove (15) is provided with a hook tongue (8).

3. The plastic extrusion mold for a flexible PVC waterstop according to claim 2, characterized in that: The outer wall of one side of the hook tongue (8) is fixedly connected to one end of the operating rod (11). The arc groove (15) has a first sliding groove (12) on one side and a second sliding groove (14) on one side of the housing (17). The operating rod (11) extends through the second sliding groove (14) to the outside of the housing (17).

4. The plastic extrusion mold for a flexible PVC waterstop according to claim 3, characterized in that: The housing (17) is provided with a slot (16), which is located between the arc groove (15) and the housing (17).

5. The plastic extrusion mold for a flexible PVC waterstop according to claim 2, characterized in that: The housing (17) is provided with a spring (9), and the two ends of the spring (9) are fixedly connected with connecting hooks (10). One end of the connecting hook (10) is connected to the operating rod (11), and the other end of the connecting hook (10) is connected to the inner wall of the housing (17).

6. The plastic extrusion mold for a flexible PVC waterstop according to claim 1, characterized in that: Both the upper mold (4) and the lower mold (5) are provided with two forming grooves (7), and the upper mold (4) is provided with two symmetrical handles (1) on both sides.

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