A low-smoke halogen-free flame-retardant conductor preheating device for twisted-pair cable

Abstract

This invention discloses a conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables, belonging to the field of cable manufacturing and processing technology. It includes a main body, a conveying mechanism and a heater installed inside the main body, and further includes: a mounting frame fixed inside the main body near the wire input port, the mounting frame being rotatably connected to guide wheels for guiding and assisting the conveying of the wire; a wire drum rotatably mounted on the mounting frame, through which the wire passes; a rotation drive mechanism disposed between the mounting frame and the wire drum; and multiple cleaning components, all mounted inside the wire drum via a positioning structure frame, with the multiple cleaning components arranged sequentially along the axial direction of the wire drum for graded cleaning of the surface of the passing wire. This invention, by integrating a rotatable wire drum and multi-stage cleaning components before the preheating process, can effectively remove surface oxide layers and contaminants before the wire enters the heater.

Description

Technical Field

[0001] This invention belongs to the field of cable production and processing technology, specifically relating to a conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted pair cables. Background Technology

[0002] In the production process of low-smoke halogen-free flame-retardant twisted-pair cables, the conductors typically require preheating before entering the extruder to be coated with the insulation layer. The main purpose of preheating is to increase the surface temperature of the conductor, enabling the insulation material to achieve a good thermal fusion bond with the conductor during coating, thereby enhancing the adhesion between the insulation layer and the conductor and ensuring the stability of the cable's electrical performance, heat aging resistance, and finished product quality.

[0003] However, after processes such as wire drawing, annealing, storage, and unwinding, an oxide layer inevitably forms on the surface of the conductor, along with impurities such as oil and dust. The presence of these surface contaminants prevents the conductor from undergoing heat treatment in a clean state before entering the preheating device. If these surface contaminants are not cleaned before preheating, the following adverse effects will occur: First, the thermal conductivity of the oxide layer is much lower than that of the metallic conductor, hindering the effective transfer of heat to the conductor substrate, reducing heat absorption efficiency, and leading to increased preheating energy consumption; second, uneven oxide layer thickness distribution will cause uneven temperature distribution on the conductor surface, affecting the consistency of the preheating effect.

[0004] To avoid the aforementioned technical problems, it is indeed necessary to provide a conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables to overcome the deficiencies in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables, comprising a main body, a conveying mechanism and a heater installed inside the main body, and further comprising: The mounting bracket is fixed inside the main body and near the wire input port. The mounting bracket is rotatably connected to guide wheels for guiding and assisting in the delivery of wires. A wire tube is rotatably mounted on the mounting frame, and the wire passes through the wire tube; A rotation drive mechanism is provided between the mounting frame and the wire tube for driving the wire tube to rotate; The cleaning components are in multiple sets, all of which are installed inside the conductor cylinder via a positioning structure frame. The multiple sets of cleaning components are arranged sequentially along the axial direction of the conductor cylinder and are used to perform graded cleaning on the surface of the conductor passing through it.

[0007] In a preferred embodiment, there are two guide wheels, which are horizontally distributed, and the wire tube is disposed between the two guide wheels so that the wire passes through the wire tube coaxially; One end of the guide tube is connected to a ring frame via a bearing. A first leg and a second leg are fixed to the outer circumference of the ring frame, and the first leg is fixed to the mounting frame.

[0008] In a preferred embodiment, the rotation drive mechanism includes a motor fixed to the mounting bracket, a drive pulley concentrically fixed to the output end of the motor, a driven pulley concentrically fixed to the outside of the guide tube, and a belt connecting the drive pulley and the driven pulley.

[0009] In one preferred embodiment, the positioning structure frame is composed of multiple circumferentially distributed elastic support units; The elastic support unit includes a positioning plate arranged along the axis of the guide tube. An elastic plate is fixed to one side of the positioning plate and the elastic plate is fixed to the inner wall of the guide tube, so that the positioning plate has a radial displacement floating amount.

[0010] In one preferred embodiment, the cleaning component includes a coarse grinding component, a fine grinding component, and a polishing component arranged sequentially along the direction of the conductor.

[0011] In a preferred embodiment, the coarse grinding component includes a first friction strip fixed to the positioning plate. The first friction strip is spiral-shaped and extends radially inward along the guide tube. Coarse friction particles are embedded in the contact area of ​​the first friction strip.

[0012] In a preferred embodiment, the grinding component includes a second friction strip fixed to the positioning plate. The second friction strip is spiral-shaped and extends radially inward along the guide tube. Fine friction particles are embedded in the contact area of ​​the second friction strip.

[0013] In a preferred embodiment, the polishing component is a spiral scraper, and the surface of the scraper is free of friction particles.

[0014] In a preferred embodiment, the guide tube has a trumpet-shaped structure, with the diameter of the inlet end being larger than the diameter of the outlet end. The inlet end forms a drain outlet, and the inner bottom of the guide tube forms a slope structure that gradually decreases from the outlet end to the inlet end.

[0015] As a preferred embodiment, a waste discharge hopper is provided below the sewage outlet, and a third leg is integrally connected to the waste discharge hopper, which is fixed to the second leg.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention, by setting a rotatable wire cylinder and a multi-stage cleaning component arranged sequentially along the axial direction of the wire cylinder, can perform a rotary, graded cleaning of the wire surface before the wire enters the heater, effectively removing the oxide layer and dirt from the wire surface. Compared with the prior art where the wire enters the preheating process with the oxide layer on, the heat can be directly transferred to the conductor substrate after the oxide layer is removed, avoiding energy loss caused by the oxide layer acting as a thermal resistance barrier. Under the condition of reaching the same preheating temperature, the required heating power is lower or the heating time is shorter, thereby reducing the operating energy consumption of the preheating device.

[0017] This invention utilizes a positioning structure frame composed of multiple circumferentially distributed elastic support units to install a cleaning component inside a wire cylinder. This allows the cleaning component to have radial displacement and, in conjunction with the rotational movement of the wire cylinder, enables the cleaning component to adapt to fluctuations in the wire diameter and perform uniform cleaning of the wire surface with 360° coverage. Compared to existing technologies that use fixed cleaning elements, have limited cleaning range, and are prone to creating blind spots, this invention completely removes the uneven oxide layer on the wire surface, allowing heat to be evenly transferred to the entire wire during preheating. This avoids local overheating or underheating and ensures the consistency and stability of the preheating temperature. This invention, by setting the wire tube as a funnel-shaped structure with an inlet diameter larger than the outlet diameter and forming a drain port at the inlet, and forming a slope structure at the bottom of the wire tube that gradually decreases from the outlet to the inlet, allows oxide debris and dirt that fall off during the cleaning process to automatically collect and be discharged from the drain port under the action of gravity. Compared with the existing technology where cleaning debris tends to accumulate inside the device, causing secondary pollution or clogging the cleaning elements, this invention achieves automatic directional discharge of debris, avoids secondary pollution, reduces equipment maintenance frequency, and simplifies the equipment structure without the need for external power or purging devices. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of a partial three-dimensional structure; Figure 3 For the present invention Figure 2 Schematic diagram of a partial three-dimensional structure; Figure 4 This is a schematic diagram of the three-dimensional structure of a partial cross-section of the conductor tube of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the conductor tube of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the rough grinding component of the present invention; Figure 7This is a schematic diagram of the three-dimensional structure of the precision-ground component of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the polishing component of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the waste discharge hopper of the present invention.

[0019] In the diagram: 1. Main body; 2. Heater; 3. Mounting bracket; 4. Guide wheel; 5. Ring frame; 6. First leg; 7. Second leg; 8. Wire tube; 9. Driven pulley; 10. Drain outlet; 11. Motor; 12. Drive pulley; 13. Belt; 14. Positioning plate; 15. Elastic plate; 16. First friction strip; 17. Coarse friction particles; 18. Second friction strip; 19. Fine friction particles; 20. Scraper; 21. Waste hopper; 22. Third leg. Detailed Implementation

[0020] The present invention will be further described below with reference to embodiments.

[0021] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0022] Please see Figure 1-9 This invention provides a conductor preheating device for low-smoke halogen-free flame-retardant twisted-pair cables, comprising a main body 1, inside which a conveying mechanism and a heater 2 are installed. The conveying mechanism is used to stably and uniformly transport the cable conductor, ensuring that the conductor precisely passes through the effective range of the heater 2 during its journey, thereby preheating the conductor and creating favorable temperature and surface conditions for its subsequent insulation coating process.

[0023] like Figure 2 and Figure 3 As shown, a mounting bracket 3 is bolted and installed inside the main body 1 near the wire input port. Two horizontally distributed guide wheels 4 are rotatably connected to the mounting bracket 3. When the wire is inserted into the main body 1, it passes through the two guide wheels 4 in sequence. The guide wheels 4 guide and assist in the transport of the wire, thereby ensuring that the wire enters the subsequent processing area smoothly and in a centered manner, reducing the risk of surface wear caused by swaying or shaking.

[0024] A rotatable wire cylinder 8 is provided on the mounting frame 3 and located between two guide wheels 4. One end of the wire cylinder 8 is connected to a ring frame 5 via a bearing. A first leg 6 and a second leg 7 are fixed to the outer circumference of the ring frame 5. The first leg 6 is fixed to the mounting frame 3 by bolts, thereby achieving stable installation of the wire cylinder 8. The wire passes through the center of the wire cylinder 8 coaxially. The wire cylinder 8 can rotate freely around its own axis, while the wire itself only moves in a straight line and does not twist.

[0025] like Figure 3 As shown, a rotation drive mechanism is also provided between the mounting frame 3 and the wire cylinder 8 to drive the wire cylinder 8 to rotate circumferentially. This rotation drive mechanism includes a motor 11 fixedly mounted on the mounting frame 3, a drive pulley 12 concentrically fixed to the output end of the motor 11, a driven pulley 9 concentrically fixed to the outside of the wire cylinder 8, and a belt 13 connecting the drive pulley 12 and the driven pulley 9. When the motor 11 starts, the wire cylinder 8 is driven to rotate smoothly and continuously through the sequential transmission of the drive pulley 12, belt 13, and driven pulley 9. By adjusting the speed of the motor 11, the rotation speed of the wire cylinder 8 can be flexibly controlled to match the cleaning requirements of different wire materials and different oxidation levels.

[0026] like Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, three sets of positioning structure frames are sequentially arranged inside the guide tube 8 along its axial direction. Each set of positioning structure frames consists of multiple elastic support units evenly distributed along the circumference. Each elastic support unit includes a positioning plate 14 arranged along the axial direction of the guide tube 8. An arc-shaped elastic plate 15 is fixed to one side of the positioning plate 14 and is fixedly installed on the inner wall of the guide tube 8. Due to the elastic deformation capability of the elastic plate 15, each positioning plate 14 can generate a certain amount of displacement and floating along the radial direction of the guide tube 8. Through the combined design of the above-mentioned elastic support unit and multi-stage cleaning components, graded, adaptive, and full-circumferential cleaning of the conductor surface is achieved. The radial floating amount provided by the elastic plate 15 allows the positioning plate 14 and its friction strips to automatically adjust their positions according to the actual diameter of the conductor. Even if there are slight diameter fluctuations or bends in the conductor, each cleaning element can maintain good contact pressure, thereby improving the cleaning effect and avoiding mechanical damage.

[0027] Meanwhile, the spiral-shaped first friction strip 16, second friction strip 18 and scraper 20 form a continuous and uniform scraping action on the surface of the wire when the wire cylinder 8 rotates, overcoming the problem of axial lines or cleaning blind spots that may be generated by fixed cleaning elements, and significantly improving the consistency and reliability of cleaning.

[0028] Inside the wire guide cylinder 8, a cleaning component is also provided. This component includes a coarse grinding component, a fine grinding component, and a polishing component, arranged sequentially along the direction in which the wire travels within the cylinder 8. As the wire enters and exits the cylinder 8, it first passes through the coarse grinding component, which forcefully scrapes away the thick oxide layer on its surface. Then, it passes through the fine grinding component, which meticulously removes the thin oxide layer remaining after coarse grinding. Finally, it passes through the polishing component, which removes loose dirt adhering to the surface and smooths and polishes the wire surface, resulting in a smooth and clean appearance. Simultaneously, as the wire guide cylinder 8 rotates, all the cleaning components inside rotate synchronously, performing a 360° circumferential, all-around cleaning operation on the wire surface. This combined with the linear motion of the wire itself creates a superior cleaning effect compared to the axial lines or blind spots that may occur with fixed cleaning elements.

[0029] The coarse grinding component includes a first friction strip 16 fixedly installed on the positioning plate 14. The first friction strip 16 is spiral-shaped and extends radially inward along the conductor cylinder 8. The first friction strip 16 can directly contact the surface of the conductor. Its contact area is embedded with dense coarse friction particles 17, such as coarse-grained diamond or hard alloy particles, for efficient and powerful scraping of the thick oxide layer on the surface of the conductor.

[0030] The fine grinding component includes a second friction strip 18 fixedly installed on the positioning plate 14. The second friction strip 18 is basically the same in material and style as the first friction strip 16 and can also contact the surface of the conductor. However, its contact area is embedded with dense fine friction particles 19, such as fine-grained alumina or silicon carbide particles, which are used to scrape off the thin oxide layer remaining after coarse grinding, making the surface of the conductor cleaner and more uniform, and providing ideal surface adhesion for subsequent coating processes.

[0031] The polishing component is a spiral scraper 20 with no abrasive particles on its surface. It is used only to scrape off and remove oxide debris or dust that has been cleaned but not completely removed from the surface of the conductor, while gently smoothing and polishing the surface of the conductor to avoid residual particles affecting the coating quality of the insulation layer.

[0032] It should be noted that the first friction strip 16, the second friction strip 18, and the scraper 20 are all made of flexible materials, such as wear-resistant rubber, polyurethane, or silicone matrix. This allows them to adhere tightly to the wire surface based on the radial floating provided by the elastic plate 15, further utilizing the inherent flexibility of the materials. Even with slight diameter fluctuations or bends in the wire, each cleaning element maintains good contact pressure, thereby improving the cleaning effect on the wire and preventing mechanical damage. Furthermore, the positioning plate 14 itself has a radial floating range, which can adaptively adjust according to the wire diameter and the wear of the friction strips and scraper 20 during use, ensuring that each cleaning element maintains stable contact with the wire and extending the maintenance cycle.

[0033] like Figure 5 As shown, the wire guide cylinder 8 has an overall trumpet-shaped structure, with the diameter of its insertion or inlet end being larger than that of its outlet end, thus naturally forming a drain outlet 10 at the insertion end. Consequently, the inner bottom of the wire guide cylinder 8 forms a slope structure that gradually decreases from the outlet end to the insertion end. Therefore, oxide debris and dirt that fall off during the cleaning process can automatically collect along the slope towards the drain outlet 10 under the action of gravity and be smoothly discharged, preventing dirt from accumulating inside the wire guide cylinder 8, avoiding secondary contamination of the wire surface, or clogging of the cleaning elements. Without the need for external power or purging devices, waste can be automatically discharged using only gravity, simplifying the equipment structure and reducing maintenance costs. Simultaneously, the timely discharge of waste prevents its accumulation inside the guide tube 8, preventing it from re-adhering to the cleaned guide tube surface and ensuring consistent cleaning effectiveness. Furthermore, the waste hopper 21 located below the drain outlet 10 guides waste into a collection container for centralized cleaning, effectively preventing waste from scattering and polluting the internal environment of the equipment.

[0034] like Figure 9 As shown, a second support 7 is welded and fixed to the ring frame 5. A waste discharge hopper 21 is provided directly below the drain outlet 10 at the end of the guide tube 8. A third support 22 is integrally connected to the waste discharge hopper 21 and is fixedly installed on the second support 7 by bolts. The waste discharge hopper 21 is used to collect oxide debris and dirt discharged from the drain outlet 10 and guide it to a designated collection container for subsequent centralized cleaning. At the same time, it effectively prevents dirt from scattering and polluting the internal environment of the equipment or adversely affecting the health of the operators.

[0035] The working principle and usage process of this invention: The cable conductor to be processed first enters through the input port of the main body 1, passes through two guide rollers 4 in sequence, and then coaxially passes through the rotatable wire drum 8. The conveying mechanism is started to drive the wire to move at a constant speed, and at the same time the motor 11 is started, driving the wire drum 8 to rotate smoothly through the driving pulley 12, belt 13 and driven pulley 9. During the linear movement of the wire inside the wire drum 8, it passes through the coarse grinding component, fine grinding component and polishing component supported by the elastic support unit in sequence.

[0036] Because the elastic plate 15 has radial floating range, and the first friction strip 16, the second friction strip 18, and the scraper 20 are all made of flexible materials, each cleaning element can adapt to the diameter fluctuations of the wire and always maintain a tight fit. Driven by the rotation of the wire cylinder 8, the spiral first friction strip 16 and the second friction strip 18 use the coarse friction particles 17 and fine friction particles 19 embedded on their surfaces to perform 360° scraping without dead angles on the surface of the wire, successively removing the thick oxide layer and residual oxides; Subsequently, the spiral scraper 20 scrapes off and removes loose dirt adhering to the surface, making the wire surface smooth and clean. During the cleaning process, oxide debris and dirt that fall off are automatically collected and discharged into the funnel-shaped drain outlet 10 along the slope at the bottom of the wire cylinder 8 under the action of gravity, falling into the waste hopper 21 below, achieving directional collection.

[0037] After cleaning, the wires continue to enter the working range of heater 2. At this time, due to the clean and uniform surface, the preheating effect is further improved, providing ideal conditions for subsequent insulation coating. This invention integrates a rotatable wire cylinder 8 and multi-stage cleaning components before the preheating process, along with an elastic adaptive structure and automatic sewage discharge design, to achieve efficient, uniform, and continuous cleaning of the oxide layer and dirt on the surface of the wire.

[0038] Compared with existing preheating devices that do not clean or only use fixed cleaning elements, this invention has significant advantages in reducing preheating energy consumption, improving preheating uniformity, ensuring process stability, and reducing equipment maintenance burden. It is especially suitable for applications with high requirements for conductor surface quality in the production of low-smoke halogen-free flame-retardant twisted pair cables.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables, comprising a main body (1), a conveying mechanism and a heater (2) installed inside the main body (1), characterized in that, Also includes: Mounting bracket (3) is fixed inside the main body (1) and close to the wire input port. The mounting bracket (3) is rotatably connected to a guide wheel (4) for guiding and assisting in the delivery of wires. The wire tube (8) is rotatably mounted on the mounting frame (3), and the wire passes through the wire tube (8). A rotation drive mechanism is provided between the mounting frame (3) and the wire tube (8) for driving the wire tube (8) to rotate; Multiple cleaning components are installed inside the wire tube (8) through a positioning structure frame and arranged sequentially along the axial direction of the wire tube (8). They rotate under the drive of the rotation mechanism to perform circumferential, continuous, and graded rotational cleaning on the surface of the wires to remove the oxide layer and dirt on the surface of the wires.

2. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 1, characterized in that: There are two guide wheels (4) and they are horizontally distributed. The wire tube (8) is placed between the two guide wheels (4) so ​​that the wire passes through the wire tube (8) coaxially.

3. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 1, characterized in that: The positioning structure frame is composed of multiple circumferentially distributed elastic support units; The elastic support unit includes a positioning plate (14) arranged along the axial direction of the wire tube (8). An elastic plate (15) is fixed on one side of the positioning plate (14). The elastic plate (15) is fixed to the inner wall of the wire tube (8), so that the positioning plate (14) has a radial displacement floating amount.

4. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 3, characterized in that: The cleaning components include a coarse grinding component, a fine grinding component, and a polishing component arranged sequentially along the direction of the conductor, which are used to coarsely grind the surface of the conductor to remove the thick oxide layer, finely grind to remove residual oxides, and polish to remove loose dirt.

5. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 4, characterized in that: The coarse grinding component includes a first friction strip (16) fixed on the positioning plate (14). The first friction strip (16) is spiral and extends radially inward along the guide tube (8). The contact area of ​​the first friction strip (16) is embedded with coarse friction particles (17).

6. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 5, characterized in that: The fine grinding component includes a second friction strip (18) fixed on the positioning plate (14). The second friction strip (18) is spiral and extends radially inward along the guide tube (8). Fine friction particles (19) are embedded in the contact area of ​​the second friction strip (18).

7. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 6, characterized in that: The polishing component is a spiral scraper (20), and the surface of the scraper (20) is free of friction particles.

8. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 1, characterized in that: The rotation drive mechanism includes a motor (11) fixed on the mounting bracket (3), a drive pulley (12) concentrically fixed to the output end of the motor (11), a driven pulley (9) concentrically fixed to the outside of the wire tube (8), and a belt (13) connecting the drive pulley (12) and the driven pulley (9).

9. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 2, characterized in that: The wire tube (8) has a trumpet-shaped structure, with the diameter of the inlet end being larger than the diameter of the outlet end. The inlet end forms a drain outlet (10). The inner bottom of the wire tube (8) forms a slope structure that gradually decreases from the outlet end to the inlet end, so that the dirt that falls off during the cleaning process can be automatically discharged into the drain outlet (10) under the action of gravity.

10. The conductor preheating treatment device for low-smoke halogen-free flame-retardant twisted-pair cables according to claim 9, characterized in that: Below the sewage outlet (10) is a waste hopper (21) for receiving and guiding the discharged waste to a collection container.

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