Removable mold assembly for CCV three-layer co-extrusion cross-linking
Through the combined structure of large and small mold cores, and the use of inner and outer cone interference fit and limit design, the problem of eccentricity change of the insulated wire core caused by mold core replacement is solved, achieving efficient production and product consistency.
Patent Information
- Application Number
- CN202422995419.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-05
AI Technical Summary
In the existing CCV medium-voltage cross-linked three-layer co-extrusion production, each time the mold core is replaced, the machine needs to be stopped and the mold changed, which wastes materials and time. In addition, small mold cores are difficult to return or need to be split after being returned to the mold, resulting in changes in the eccentricity of the insulation core and affecting product consistency.
A combination of large and small mold cores is used, with an interference fit between the inner and outer cones. The small mold core sleeve is fixed to the core seat with threads, the limiting protrusions and limiting grooves are slidably fitted, and the tapered angle design reduces the gap to achieve rapid positioning and demolding.
Improve production efficiency, reduce mold change time, ensure product quality, reduce maintenance costs, prevent small mold cores from being stranded, and adapt to the production of cables of different specifications.
Smart Images
Figure CN223478285U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cable extrusion die structure, specifically a removable die assembly for CCV three-layer co-extrusion cross-linking. Background Technology
[0002] The original CCV (Continuous Cross-linking) three-layer co-extrusion production method involved producing one conductor specification per die core. Each specification change required stopping the machine, changing the die, and restarting. Each die change wasted significant amounts of raw materials and time. Some manufacturers used a smaller die core directly, allowing for co-production of a smaller specification, but this smaller die core could not be removed to restore the original die specification. Furthermore, to ensure accurate fitting between the smaller die core and the original die, a certain tolerance was necessary, inevitably causing changes in the core eccentricity after die fitting. Other manufacturers used reusable die-removal devices, but after removal, the smaller die core needed to be cut open on-site with an electric saw. This was prone to errors at high production speeds, or production speeds needed to be reduced to ensure sufficient time for cutting the smaller die core. Adjusting production speed affected product consistency. Utility Model Content
[0003] The purpose of this invention is to provide a removable die assembly for CCV three-layer co-extrusion cross-linking, in order to solve the problem that the position of the insulated wire core changes after the existing die head and die core are replaced, resulting in poor accuracy and affecting product consistency.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a retractable die assembly for CCV three-layer co-extrusion crosslinking, comprising a large die core and a small die core, wherein a small die core sleeve is installed at the tail end of the small die core, the inlet end of the small die core sleeve is an inner cone structure, the tail end of the small die core is an outer cone structure, the outer cone structure and the inner cone structure are interference fit, and the large die core is installed at one end of the die core seat.
[0005] As a further improvement to the above technical solution:
[0006] The small mold core includes a left mold and a right mold, and the left mold and the right mold are provided with positioning structures. The positioning structures are male and female groove structures, which facilitate the assembly of the left mold and the right mold.
[0007] The outer cone structure is provided with a limiting protrusion, and the inner cone structure is provided with a limiting groove, and the limiting protrusion and the limiting groove are slidably engaged.
[0008] The small mold core sleeve has a threaded section at its tail end that mates with the mold core base. The small mold core sleeve is fixed to the mold core base via the threaded section.
[0009] The outer cone structure and the inner cone structure have the same cone angle, and the angle between the cone surface and the central axis is 1°.
[0010] The tail of the small mold core sleeve is provided with a transition section that transitions with the mold core seat.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] Improved production efficiency: The conical design of the small mold core and the small mold core sleeve reduces the clearance between components and makes operation simple, which greatly shortens the mold change time and improves production efficiency.
[0013] Ensuring product quality: The tapered design ensures a tight fit between the small mold core and the inner wall of the small mold core sleeve, reducing the gap between components and effectively minimizing the change in insulation eccentricity after molding. This ensures the eccentricity of the insulated wire core and thus improves product quality.
[0014] Easy to operate: The combination of limiting protrusions and limiting grooves enables rapid positioning and fixing of small mold cores, simplifying the operation process and reducing the difficulty of operation.
[0015] Reduced maintenance costs: When replacing the mold core, the small mold core can be removed simply by pulling out the small mold core sleeve, and a new small mold core can be replaced, thus reducing maintenance costs.
[0016] Improved alignment: The transition fit design between the small mold core sleeve and the mold core seat improves the alignment of the small mold core, further ensuring product quality.
[0017] Preventing small mold cores from getting stuck: The rotating fixing method effectively prevents small mold cores from getting stuck inside the large mold core during mold removal, avoiding malfunctions during the production process.
[0018] High adaptability: The mold combination structure in this embodiment is simple and highly adaptable, and can be widely used in the production of cables of different specifications.
[0019] In summary, the CCV three-layer co-extrusion crosslinking removable mold assembly of this embodiment has significant advantages in improving production efficiency, ensuring product quality, and reducing maintenance costs, and has high practical value and market prospects. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a schematic diagram of the internal structure of the small mold core of this utility model;
[0022] Figure 3 This is a schematic diagram of the small mold core structure of this utility model;
[0023] Figure 4 This is a schematic diagram of the internal structure of the small mold core sleeve of this utility model;
[0024] Figure 5 This is a schematic diagram of the internal side view of the small mold core sleeve of this utility model;
[0025] Figure 6 This is a schematic diagram of the assembly structure of the small mold core and the small mold core sleeve of this utility model;
[0026] Figure 7 This is a schematic diagram of the assembly structure of the large mold core and the small mold core of this utility model.
[0027] Reference numerals in the attached diagram: 1. Large mold core; 2. Small mold core; 21. Left mold; 22. Right mold; 23. Limiting protrusion; 24. Positioning structure; 3. Small mold core sleeve; 31. Limiting groove; 32. Threaded section; 33. Transition section; 4. Mold core seat. Detailed Implementation
[0028] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicating orientation or position, are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] 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.
[0032] like Figures 1 to 5As shown, the CCV three-layer co-extrusion crosslinking removable mold assembly of this embodiment includes a large mold core 1 and a small mold core 2. A small mold core sleeve 3 is installed at the tail of the small mold core 2. The inlet end of the small mold core sleeve 3 has an inner cone structure, and the tail of the small mold core 2 has an outer cone structure. The outer cone structure and the inner cone structure are interference-fitted. The large mold core 1 is installed at one end of the mold core seat 4. The small mold core 2 includes a left mold 21 and a right mold 22. Positioning structures 24 are provided on the left mold 21 and the right mold 22. A limiting protrusion 23 is provided on the outer cone structure, and a limiting groove 31 is provided on the inner cone structure. The limiting protrusion 23 and the limiting groove 31 are in sliding fit. When the small mold core 2 is inserted into the small mold core sleeve 3, it is pushed in from the limiting groove 31. After it is in place, the small mold core 2 rotates a certain angle and is then fixed, preventing the small mold core 2 from sliding and remaining in the large mold core 1 during demolding. The tail of the small mold core sleeve 3 is provided with a threaded section 32 that mates with the mold core seat 4. The outer cone structure and the inner cone structure have the same cone angle, and the included angle between the cone surface and the central axis is 1°; this facilitates the direct insertion of the small mold core 2 into the small mold core sleeve 3 and ensures a tight fit between it and the inner wall of the cone of the small mold core sleeve 3, reducing the variation in insulation eccentricity caused by component fit tolerances. The tail of the small mold core sleeve 3 is provided with a transition section 33 that transitions to fit with the mold core seat 4.
[0033] In use, the cable is threaded through the small mold core sleeve 3, and the left mold 21 and right mold 22 are wrapped around the cable and merged into one unit. The small mold core 2 is formed by fixing it with the positioning structure 24. Figure 6 As shown, the small mold core 2 is inserted into the small mold core sleeve 3. Positioning is achieved through the cooperation of the limiting protrusion 23 and the limiting groove 31. After insertion, a certain angle is rotated to offset the limiting protrusion 23 and the limiting groove 31. Figure 7 Next, push the small mold core sleeve 3 into the mold core seat 4, so that the small mold core 2 enters the large mold core 1. The transition fit between the small mold core sleeve 3 and the mold core seat 4 improves the alignment of the small mold core. When changing the mold core later, simply pull out the small mold core sleeve 3, remove the small mold core 2, and replace it with a new small mold core 2.
[0034] In this embodiment, the CCV three-layer co-extrusion crosslinking removable die assembly features a conical design at the joint between the small die core and the small die core sleeve, reducing the gap between components and saving die change time. Simultaneously, the transition fit between the outer diameter of the small die core sleeve and the inner diameter of the die core seat ensures proper alignment of the small die core, reducing tolerance accumulation caused by using the small die core and guaranteeing the eccentricity of the insulated wire core.
[0035] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A removable die assembly for CCV three-layer co-extrusion crosslinking, characterized in that, It includes a large mold core (1) and a small mold core (2). The small mold core (2) is equipped with a small mold core sleeve (3) at its tail. The inlet end of the small mold core sleeve (3) is an inner cone structure, and the tail end of the small mold core (2) is an outer cone structure. The outer cone structure and the inner cone structure are interference fit. The large mold core (1) is installed at one end of the mold core seat (4).
2. The removable die assembly for CCV three-layer co-extrusion crosslinking according to claim 1, characterized in that: The small mold core (2) includes a left mold (21) and a right mold (22), and positioning structures (24) are provided on the left mold (21) and the right mold (22).
3. The removable die assembly for CCV three-layer co-extrusion crosslinking according to claim 1, characterized in that: The outer cone structure is provided with a limiting protrusion (23), and the inner cone structure is provided with a limiting groove (31). The limiting protrusion (23) and the limiting groove (31) are in sliding fit.
4. The removable die assembly for CCV three-layer co-extrusion crosslinking according to claim 1, characterized in that: The tail of the small mold core sleeve (3) is provided with a threaded section (32) that mates with the mold core seat (4).
5. The removable die assembly for CCV three-layer co-extrusion crosslinking according to any one of claims 1 to 4, characterized in that: The outer cone structure and the inner cone structure have the same cone angle, and the angle between the cone surface and the central axis is 1°.
6. The removable die assembly for CCV three-layer co-extrusion crosslinking according to claim 4, characterized in that: The tail of the small mold core sleeve (3) is provided with a transition section (33) that transitions with the mold core seat (4).