Three-layer co-extrusion die suitable for multi-specification conductors and catenary cross-linking device

Abstract

The utility model relates to the technical field of medium-voltage cross-linked cable production, and provides a three-layer co-extrusion die and a catenary cross-linking device for multi-specification conductors, comprising a conductor channel arranged in the three-layer co-extrusion die, one end of the conductor channel is provided with an inlet, the other end of the conductor channel is provided with an outlet, and the conductor channel is used for guiding a conductor to pass through the center of the three-layer co-extrusion die; the mold core is arranged in the three-layer co-extrusion mold and located on one side of the outlet of the conductor channel, and the mold core is provided with a through hole for the conductor to pass through; the supporting block is detachably connected in the penetrating hole, a through hole for the conductor to penetrate through is formed in the supporting block, and the supporting block is used for supporting the conductor; when the outer diameter of a conductor needing to be processed by the three-layer co-extrusion die is reduced, necessary support can be provided for the conductor and an eccentric phenomenon can be prevented by fixing the appropriate supporting block in the through hole of the die core, and the die core does not need to be replaced by shutdown, so that continuous production is realized, the shutdown frequency is reduced, and the material waste and the production cost are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of medium-voltage cross-linked cable production technology, specifically relating to a three-layer co-extrusion mold and a catenary cross-linking device suitable for conductors of multiple specifications. Background Technology

[0002] The insulation extrusion process for medium-voltage cross-linked cables typically employs a three-layer co-extrusion continuous cross-linking unit. Its greatest advantage is its ability to achieve continuous extrusion and cross-linking, making it suitable for long-length production. However, each time a different conductor specification is changed, the machine must be stopped. This not only affects work efficiency but also leads to the following specific problems: Time loss: Cleaning the extruder screw and die head and reheating the equipment takes about one day, severely impacting delivery time; Material waste: Starting and stopping the machine generates approximately 50 kg of waste adhesive, which cannot be reused. When changing specifications, new insulation material needs to be extruded to cover 200 meters of conductor core, increasing material waste; Increased costs: The cost of each shutdown to change specifications can reach tens of thousands of yuan, including waste adhesive disposal costs, conductor core material waste, screw cleaning costs, and other expenses such as labor, water, and electricity costs.

[0003] To address the aforementioned issues, existing technology involves stopping the extrusion process after producing the current conductor specification, then quickly replacing the core with the next specification of three-layer core to minimize downtime and approximate a continuous production mode without stopping. However, this technology has a fatal flaw: the core replacement time must be strictly controlled within 20 minutes. If this time is exceeded, the cross-linking material, being highly sensitive to temperature, will stop flowing, leading to pre-cross-linking and resulting in substandard product quality, ultimately leading to scrap. Core replacement not only increases quality risks but can also cause product quality instability. After each core replacement, the eccentricity must be readjusted to ensure uniform material distribution across layers. During this readjustment, the extrusion mold needs time to reach a stable production state. During this adjustment period, because the eccentricity is not yet fully adjusted, the produced cable cores may have uneven thickness and eccentricity issues. These problems affect the electrical performance and mechanical strength of the cable, rendering these cores unusable in the finished product and resulting in significant material waste. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is: to propose a three-layer co-extrusion mold and a catenary crosslinking device suitable for conductors of multiple specifications. By fixing the support block in the core hole, the support is provided for the conductor with a smaller outer diameter, so as to achieve the operation without stopping the machine when changing to a smaller outer diameter conductor, thereby reducing the number of downtimes in the production process.

[0005] The technical solution adopted by this utility model to solve its technical problem is to propose a three-layer co-extrusion die suitable for conductors of multiple specifications, comprising:

[0006] A conductor channel is provided inside the three-layer co-extrusion die. One end of the conductor channel is provided with an inlet and the other end is provided with an outlet, which is used to guide the conductor through the center of the three-layer co-extrusion die.

[0007] The die core is disposed within the three-layer co-extrusion die and located on one side of the conductor channel outlet, and the die core is provided with perforations for the conductor to pass through;

[0008] A support block, detachably connected within the through hole, having a through hole for a conductor to pass through, the support block being used to provide support for the conductor;

[0009] The support block can be fixed inside the through hole as the outer diameter of the conductor entering the conductor channel becomes smaller, in order to prevent the conductor from shifting.

[0010] In the aforementioned three-layer co-extrusion die suitable for multi-specification conductors, the perforation has a parallel section and an open section, the open section being used to guide the conductor into the perforation.

[0011] In the aforementioned three-layer co-extrusion mold suitable for multi-specification conductors, the outer wall of the support block has a first clamping section and a second clamping section, and the support block is fixed in the perforation through the first clamping section and the second clamping section.

[0012] In the aforementioned three-layer co-extrusion die suitable for multi-specification conductors, the first clamping section abuts against the inner wall of the parallel section through which the die core is perforated, in order to prevent leakage of extruded material.

[0013] In the aforementioned three-layer co-extrusion mold suitable for multi-specification conductors, the second clamping section abuts against the inner wall of the opening section of the die core through hole to prevent the support block from loosening.

[0014] In the aforementioned three-layer co-extrusion die suitable for multi-specification conductors, an intermediate die is also sleeved on the outside of the die core, and a first channel for the flow of conductor shielding material is formed between the outer wall of the die core and the inner wall of the intermediate die.

[0015] In the aforementioned three-layer co-extrusion die suitable for multi-specification conductors, an outer die is also sleeved on the outside of the middle die, and a second channel for the flow of insulating material is formed between the outer wall of the middle die and the inner wall of the outer die.

[0016] In the aforementioned three-layer co-extrusion die suitable for multi-specification conductors, a die sleeve is also provided on the outer side of the outer die, and a third channel for the flow of protective material is formed between the inner wall of the die sleeve and the outer wall of the outer die.

[0017] This utility model also proposes a catenary crosslinking device, comprising:

[0018] One of the above is a three-layer co-extrusion die suitable for conductors of multiple specifications;

[0019] A vulcanizing tube, which is disposed on one side of the three-layer co-extrusion die, is used to cross-link the formed cable.

[0020] In the aforementioned catenary crosslinking device, a detection element is also provided on the side of the vulcanizing pipe near the three-layer co-extrusion die. The detection element is used to detect the concentricity of the cable.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The detachable support block inside the core hole can adapt to conductors with different outer diameter specifications. When the outer diameter of the conductor to be processed becomes smaller, the appropriate support block can be fixed in the core hole to provide necessary support for the conductor. There is no need to stop the machine to replace the core, which realizes continuous production, reduces the number of downtimes, and reduces material waste and production costs.

[0023] (2) The through hole in the support block ensures that the conductor can smoothly enter and move in the center when changing to a smaller outer diameter, preventing eccentricity and thus ensuring the quality of the cable. The inner diameter of the through hole is slightly larger than the outer diameter of the conductor (usually 0.7 to 0.8 mm) to ensure that the conductor passes through stably without deviation.

[0024] (3) The catenary cross-linking device significantly improves the mechanical strength, heat resistance and electrical performance of the cable through multi-layer co-extrusion and cross-linking treatment. The setting of the detection component monitors the concentricity of the cable in real time, ensuring that the materials of each layer are evenly distributed and centered, which further improves the quality and performance of the cable. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the scheme;

[0026] Figure 2 This is a schematic diagram of the core and support block structure in this scheme;

[0027] Figure 3 This is a schematic diagram of the mold core structure in this scheme;

[0028] Figure 4 This is a schematic diagram of the support block structure in this scheme.

[0029] In the diagram, 1. Three-layer co-extrusion die; 2. Conductor channel; 3. Inlet; 4. Die core; 5. Perforation; 6. Support block; 7. Through hole; 8. Parallel section; 9. Opening section; 10. First clamping section; 11. Second clamping section; 12. Middle layer die; 13. Outer layer die; 14. Die sleeve; 15. Vulcanizing tube; 16. Inspection piece. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

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

[0032] like Figure 1 As shown in the figure, in this solution, a three-layer co-extrusion die and catenary cross-linking device suitable for multi-specification conductors are mainly used for continuous extrusion and cross-linking of medium-voltage cross-linked cables to achieve long-length production.

[0033] like Figures 1 to 4 As shown, this utility model discloses a three-layer co-extrusion mold suitable for conductors of various specifications, comprising: a conductor channel 2 disposed within a three-layer co-extrusion mold 1, with an inlet 3 at one end and an outlet at the other end, for guiding the conductor through the center of the three-layer co-extrusion mold 1; a mold core 4 located on one side of the outlet of the conductor channel 2, with a through hole 5 for the conductor to pass through; a support block 6 detachably connected within the through hole 5 and abutting against the inner wall of the mold core 4, with a through hole 7 for the conductor to pass through, for providing support for the conductor; the support block 6 can be fixed within the through hole 5 as the outer diameter of the conductor entering the conductor channel 2 decreases, for preventing the conductor from shifting.

[0034] During operation, the conductor enters the center of the three-layer co-extrusion die through conductor channel 2 inlet 3 and moves into the perforation 5 of the die core 4. When the outer diameter of the conductor matches the inner diameter of the perforation 5, the inner wall of the perforation 5 on the die core 4 directly supports the conductor, ensuring that the material of each layer of the formed cable is evenly distributed, thereby guaranteeing the quality of the finished cable. When a conductor with a smaller outer diameter needs to be processed, in order to maintain continuous production, the larger diameter conductor is first welded to the smaller diameter conductor. Before the welding operation, a support block 6 of appropriate size is pre-installed on the smaller diameter conductor. As the conductor moves, the welding head and the support block 6 reach the die core 4 together. Inside the perforation 5, a special tool is used to push the support block 6 to make it fit tightly against the inner wall of the perforation 5, ensuring that the support block 6 can stay stably inside the die core 4, providing support and fixation for the conductor. This method of fixing the support block 6 inside the perforation 5 can ensure that the material of each layer of the formed cable can be evenly distributed without replacing the die core 4. Therefore, the three-layer co-extrusion die 1 in this solution can efficiently and accurately produce high-quality cable products without stopping the machine, while reducing material waste and production costs. This structure not only improves the stability and efficiency of production, but also ensures the quality of the final product.

[0035] In the production process of the three-layer co-extrusion die 1, in order to ensure uniform material distribution in each layer, the inner diameter of the perforation 5 of the die core 4 is usually designed to be 0.7-0.8 mm larger than the outer diameter of the conductor. This is a common design standard, but in some special applications, the specific difference may need to be adjusted according to the production process requirements. Under the same die core 4 operation, when it is necessary to process conductors with smaller outer diameters, a support block 6 of appropriate size is selected according to the outer diameter of the conductor to ensure that the outer wall of the support block 6 can fit tightly with the inner wall of the perforation 5 of the die core 4, preventing material leakage during production. At the same time, the through hole 7 of the support block 6... The diameter should be designed to be 0.7 to 0.8 mm larger than the outer diameter of the conductor to ensure that the conductor can pass smoothly through the through hole 7 without deviation. The special tool for fixing the support block 6 can be a slender operating rod. When the support block 6 moves with the conductor to the position of the through hole 5, insert one end of the tool into the conductor channel 2 and push the support block 6 along the direction of conductor movement until it is fully inserted and fixed in the through hole 5. The purpose of this tool is to accurately push the support block 6 into the through hole 5 of the mold core 4 without affecting the movement of the conductor, and to ensure that the outer wall of the support block 6 fits tightly against the inner wall of the through hole 5.

[0036] Furthermore, the perforation 5 has a parallel section 8 and an open section 9. The open section 9 is mainly used to guide the conductor into the perforation 5. It can usually be a conical or horn-shaped inlet 3, with the inner diameter gradually decreasing from large to close to the parallel section 8. This design can effectively guide the conductor into the perforation 5, reduce friction and resistance, and prevent the conductor from deviating or getting stuck during entry. The parallel section 8 provides a stable conductor channel, allowing the conductor to move smoothly within it. The inner diameter of this section remains constant, slightly larger than the outer diameter of the conductor (usually a difference of 0.7 to 0.8 mm), to ensure that the conductor can move smoothly within it without deviating. In addition, the design of the parallel section 8 also ensures that the conductor remains centered throughout the extrusion process, avoiding eccentricity and thus ensuring the quality of the cable.

[0037] Furthermore, the outer wall of the support block 6 has a first abutting section 10 and a second abutting section 11, and the support block 6 is fixed in the perforation 5 through the first abutting section 10 and the second abutting section 11.

[0038] Furthermore, the outer wall of the first clamping section 10 abuts against the inner wall of the parallel section 8 to prevent leakage of extruded material.

[0039] Furthermore, the outer wall of the second clamping section 11 abuts against the inner wall of the opening section 9 to prevent the support block 6 from loosening.

[0040] Under the same mold core 4 operation, when it is necessary to process conductors with smaller outer diameters, the support block 6 can be fixed into the through hole 5 without stopping the machine. The specific steps are as follows: First, select a suitable support block 6. Select a support block 6 of appropriate size according to the specific outer diameter of the conductor. Ensure that the inner diameter of the through hole 7 on the support block 6 is slightly larger than the outer diameter of the conductor (usually a difference of 0.7 to 0.8 mm) to ensure that the conductor can move smoothly in it without deviation. Ensure that the outer diameter of the support block 6 matches the inner diameter of the through hole 5, thereby ensuring a tight fit between the support block 6 and the through hole 5. Next, install the support block 6. Pre-fit the support block 6 onto the small diameter conductor. Use a special tool to push the support block 6 into the through hole 5 of the mold core 4. During the pushing process, ensure that the first pressing section 10 is tightly fitted with the inner wall of the parallel section 8 of the through hole 5 of the mold core 4 to prevent material leakage. At the same time, ensure that the second pressing section 11 is tightly fitted with the inner wall of the opening section 9 of the through hole 5 of the mold core 4 to prevent the support block 6 from loosening.

[0041] In order to ensure that the conductor shielding material can be evenly wrapped around the conductor, a middle layer mold 12 is also fitted on the outside of the mold core 4. The purpose of this is to form a first channel for the conductor shielding material to flow. Through this design, the conductor shielding material can flow in the first channel formed between the outer wall of the mold core 4 and the inner wall of the middle layer mold 12, and evenly wrap around the surface of the conductor, providing a good shielding effect.

[0042] To ensure that the insulating material can be evenly wrapped around the conductor shielding layer, an outer mold 13 is also fitted over the middle mold 12. The purpose is to form a second channel for the flow of the insulating material. Through this design, the insulating material can flow in the second channel formed between the outer wall of the middle mold 12 and the inner wall of the outer mold 13, and evenly wrap around the surface of the conductor shielding layer, providing good insulation.

[0043] In order to ensure that the protective material can be evenly wrapped around the insulation layer, a mold sleeve 14 is also provided on the outside of the outer mold 13. The purpose is to form a third channel for the flow of the protective material. Through this design, the protective material can flow in the third channel formed between the outer wall of the outer mold 13 and the inner wall of the mold sleeve 14, and evenly wrap around the surface of the insulation layer, providing a good protective effect.

[0044] This utility model also proposes a catenary cross-linking machine, including the above-mentioned three-layer co-extrusion mold suitable for multi-specification conductors, and also includes a vulcanizing tube 15, which is disposed on one side of the three-layer co-extrusion mold 1. The main function of the vulcanizing tube 15 is to perform cross-linking treatment on the cable that has completed the three-layer co-extrusion. In the vulcanizing tube 15, the cable undergoes heating and chemical reaction, causing the insulation material and protective material to cross-link, thereby significantly improving the mechanical strength, heat resistance and electrical performance of the cable.

[0045] To ensure the concentricity of the cable, a detection element 16 is also provided on the side of the vulcanizing tube 15 near the three-layer co-extrusion mold 1. The main function of the detection element 16 is to detect the concentricity of the cable in real time, that is, whether the conductor, insulation layer and protective layer are evenly distributed and centered. Through this detection, the eccentricity problem that may occur in the production process can be detected and corrected in time, thereby improving the quality and performance of the cable. The detection element 16 is preferably a Sikola eccentricity meter. The Sikola eccentricity meter is a high-precision measuring device that is widely used in the wire and cable manufacturing industry. This device is mainly used for online monitoring and control of the cable production process to ensure that the materials of each layer of the cable (such as conductor, insulation layer, shielding layer and sheath) are evenly distributed and centered, thereby ensuring the high quality and performance of the cable.

[0046] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0048] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A three-layer co-extrusion die suitable for multi-gauge conductors, characterized in that, It comprises: a conductor channel arranged in the three-layer co-extrusion die, one end of the conductor channel is provided with an inlet, and the other end is provided with an outlet for guiding the conductor through the center of the three-layer co-extrusion die; a mold core arranged in the three-layer co-extrusion die and located on one side of the outlet of the conductor channel, the mold core is provided with a through hole for the conductor to pass through; a support block detachably connected in the through hole, the support block has a through hole for the conductor to pass through, and the support block is used for providing support for the conductor; The support block can be fixed in the through hole due to the decrease of the outer diameter specification of the conductor entering the conductor channel, so as to prevent the conductor from deviating.

2. The three layer co-extrusion die suitable for multi-specification conductors according to claim 1, wherein, The through hole has a parallel section and an opening section, and the opening section is used for guiding the conductor into the through hole.

3. The three layer co-extrusion die suitable for multi-specification conductors according to claim 2, wherein, The outer wall of the support block has a first abutting section and a second abutting section, and the support block is fixed in the through hole through the first abutting section and the second abutting section.

4. The three layer co-extrusion die suitable for multi-specification conductors according to claim 3, wherein, The first abutting section abuts against the inner wall of the parallel section of the mold core through hole, so as to prevent the leakage of extruded material.

5. The three layer co-extrusion die suitable for multi-specification conductors according to claim 3, wherein, The second abutting section abuts against the inner wall of the opening section of the mold core through hole, so as to prevent the support block from loosening.

6. The three layer co-extrusion die suitable for multi-specification conductors according to claim 1, wherein, The outer side of the mold core is further sleeved with a middle layer mold, and a first channel for the flow of conductor shielding material is formed between the outer wall of the mold core and the inner wall of the middle layer mold.

7. A three layer co-extrusion die suitable for multi-gauge conductors as claimed in claim 6 wherein, The outer side of the middle layer mold is further sleeved with an outer layer mold, and a second channel for the flow of insulating material is formed between the outer wall of the middle layer mold and the inner wall of the outer layer mold.

8. A three layer co-extrusion die suitable for multi-gauge conductors as claimed in claim 7 wherein, The outer side of the outer layer mold is further sleeved with a mold sleeve, and a third channel for the flow of protective material is formed between the inner wall of the mold sleeve and the outer wall of the outer layer mold.

9. A catenary crosslinking device characterized by, It comprises: The three-layer co-extrusion die for multi-specification conductors according to any one of claims 1-8; A vulcanization tube is arranged on one side of the three-layer co-extrusion die for cross-linking treatment of the formed cable.

10. The catenary crossing device of claim 9, wherein, A detection member is further arranged on one side of the three-layer co-extrusion die close to the vulcanization tube, and the detection member is used for detecting the concentricity of the cable.

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