High-binding-force cable extrusion device

Abstract

The invention relates to the technical field of cable extrusion devices, and discloses a high-binding-force cable extrusion device which comprises a cable traction machine and a screw extruder, the cable traction machine and the screw extruder are provided with a cable extrusion end and a melt extrusion end respectively, and the cable extrusion end is connected with the melt extrusion end. The cable extrusion end is internally provided with a cable traction cavity for cable movement and fusion coating, a point pressing ring is arranged in the cable extrusion end and in front of a connection point of the fusion extrusion end, the point pressing ring is annular, the cable traction cavity penetrates through the circle center of the point pressing ring, control cavities are circumferentially arrayed on the point pressing ring, a fixing frame for separating the cavities is arranged between the control cavities, and the control cavities are connected with the fixing frame. A driving block and a heating rod are arranged in the control cavity, a hot-pressing notch for the heating rod to pass through is formed in the inner side of the point pressing ring, the driving block drives the heating rod to penetrate through the hot-pressing notch, a cable surface coating layer passing through the cable traction cavity is subjected to hot pressing, and concave points are formed in the cable coating layer.

Description

Technical Field

[0001] The invention relates to the technical field of cable extrusion devices, in particular to a cable extrusion device with high bonding force. Background Art

[0002] The cable extrusion device is a core piece of equipment in the cable manufacturing process, primarily used to uniformly coat the outer layer of the cable conductor with insulating material or sheathing. Its operating principle is to melt the polymer material through heating, then evenly extrude the molten material onto the conductor surface through a forming die. After cooling and shaping, a dense coating is formed. The device typically consists of a control chamber, a slide rail, a heating rod, and an electromagnetic drive system. Driven by a sliding block, the heating rod reciprocates along the slide rail, hot-pressing a spiral concave structure onto the cable surface. This design not only enhances the mechanical engagement between the coating and the conductor but also significantly improves the electrical insulation and mechanical strength of the cable by optimizing material fluidity and interface bonding. The device utilizes electromagnetic drive control, coupled with a precision spring buffer system, to achieve high-speed, precise positioning of the heating rod, ensuring uniform and consistent distribution of the concave points. Its modular design supports rapid component replacement to meet the production needs of cables of varying specifications. It is also compatible with recycled materials, embodying the concept of green manufacturing. The device demonstrates significant advantages in improving production efficiency and ensuring cable quality, and is widely used in cable manufacturing in power transmission, communication networks, and new energy sectors.

[0003] There are two main processes for multi-layer cable coating, single-layer extrusion multiple superposition and multi-layer co-extrusion. In the multi-layer co-extrusion device, multiple extruders work synchronously, and the molten material is formed into a multi-layer structure at one time through the co-extrusion die. Although it has high efficiency and good interlayer bonding strength, it requires multiple extruders and precision co-extrusion dies, and the equipment cost is high. The melting temperature and fluidity of each layer of material need to be matched, and the parameters of multiple extruders (such as pressure and temperature) need to be balanced. The debugging cycle is long and the technical threshold is high. In the single-layer extrusion multiple superposition process, because the multi-layer coating is carried out after the previous coating layer is solidified, the bonding strength between the layers is obviously insufficient, affecting the overall cable performance. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a high-bonding-force cable extrusion device, which has the advantage of high bonding strength of single-layer stacking extrusion, and solves the problem of insufficient bonding strength between layers of single-layer stacking extrusion of cables.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose of high bonding strength of single-layer superimposed extrusion, the present invention provides the following technical solution: a high-bonding-force cable extrusion device, comprising a cable traction machine and a screw extruder, wherein the cable traction machine is provided with a crawler for pulling the cable, the cable traction machine and the screw extruder are respectively provided with a cable extrusion end and a melt extrusion end, the cable extrusion end and the melt extrusion end are connected, and the cable extrusion end is provided with a cable traction cavity for cable movement and melt coating, and the melt extrusion end is used to squeeze the melted material in the screw extruder into the cable traction cavity, and the cable extrusion end is provided with a pressure point ring in front of the connection point of the melt extrusion end, the pressure point ring is annular, and the cable traction cavity passes through the center of the pressure point ring, and the pressure point ring has a circumferential array of control cavities, and a fixing frame for separating the cavities is provided between the control cavities, and a driving block and a heating rod are provided in the control cavity, and a hot pressing notch for the heating rod to pass through is provided on the inner side of the pressure point ring, and the driving block drives the heating rod through the hot pressing notch to hot press the surface coating of the cable passing through the cable traction cavity, leaving concave spots on the cable coating.

[0008] Slide rails are provided on the fixing frames at both sides of the control cavity, and movable sliding blocks are provided on the slide rails. The heating rod is fixed on the sliding blocks and moves along the slide rails.

[0009] The driving block is a permanent magnet and is fixed to one end of the slide rail away from the hot pressing notch. The sliding block is an electromagnet and achieves sliding on the slide rail by changing its magnetism.

[0010] A steel spring is provided between the driving block and the sliding block.

[0011] The fixing frame is made of magnetic isolation material.

[0012] The sliding blocks can be controlled independently. During the cable surface treatment process, the sliding blocks in different control cavities drive the heating rods to perform hot pressing in a clockwise or counterclockwise order, so that the cable surface coating forms spirally arranged concave points.

[0013] At least two heating rods are provided on the sliding block, and the contact surfaces at the bottoms of the heating rods are in an arc shape.

[0014] The pressure point ring is provided with cooling plates on both sides of the heating rod position, and the cooling plates are provided with pipelines for coolant flow.

[0015] An infrared detector for detecting distance is provided in the cable pulling cavity and at the front end of the pressure point ring.

[0016] The cable extrusion end is provided with a pipeline for nitrogen to pass through, so that the hot pressing of the heating rod and the molten layer coating of the molten extrusion end are completed in a nitrogen environment.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides a cable extrusion device with high bonding force, which has the following beneficial effects:

[0019] 1. This high-bonding-force cable extrusion device forms regularly distributed concave points on the cable surface through the heating rod on the pressure point ring, transforming the originally smooth coating interface into a microscopic rough structure. When the molten material fills these concave points, the mechanical bite force replaces the simple physical adsorption, and the shear strength and peel strength are significantly improved. At the same time, the heating process causes the bottom coating material to soften locally, promoting the diffusion of the new melt and the molecular chain of the existing coating layer, forming chemical bonding and transition layers, effectively blurring the interface boundary, and fundamentally solving the problem of weak interlayer bonding in the single-layer stacking process. The traditional single-layer extrusion process results in a clear interface due to the cooling and solidification of the material, while this device uses hot pressing to achieve a smoother interface. The synergistic effect of melting allows the new melt to deeply penetrate into the concave pores under pressure to achieve molecular-level penetration. This penetration not only increases the effective contact area, but also forms a three-dimensional network structure through the entanglement of molecular chains, significantly improving the toughness of the interface. The control cavity of the pressure point ring adopts a modular design. It can adapt to the coating requirements of cables of different specifications by adjusting the temperature, pressure point density and depth parameters of the heating rod. The coordinated control mechanism of the drive block and the heating rod makes the hot pressing process dynamically adjustable, which can not only ensure the uniformity of the coating layer, but also customize the interface treatment for special cable structures. Compared with the complex flow channel design of the multi-layer co-extrusion equipment, the interface morphology is more unique, making it easier to inspect the cable in the future. During repair, the ultrasonic detection signal characteristics are more obvious, which effectively improves the defect recognition rate. The traditional smooth coating layer interface will cause the ultrasonic wave to produce mirror reflection, and the defect echo is easily superimposed on the interface wave, resulting in low detection signal recognition. The device uses the microscopic pit structure formed by the pressure point ring to construct a regularly distributed acoustic scattering center at the interface. When the ultrasonic wave encounters these pits, multi-path reflection and diffraction phenomena will occur, forming a unique signal modulation feature. This modulation is like superimposing an "acoustic fingerprint" on the defect signal, making the defect echo present a recognizable waveform distortion in both the time domain and the frequency domain. The detection instrument can locate the defect more accurately through the pattern recognition algorithm. The concave point structure can significantly improve the detection rate of defects such as early microcracks and interface debonding. The concave point structure also reduces the requirements for the fluidity of the coating material and reduces the production cost. The concave point structure of this device forms a local turbulence generator on the flow path of the molten material through the mechanical anchoring effect. When the melt flows through the concave point, it will produce a change in flow direction and a velocity gradient. This disturbance enables the melt to fully infiltrate the cable surface at a lower injection pressure, just like setting a guide plate in a smooth pipe. The concave point structure transforms laminar flow into a transitional flow state, effectively improving the radial heat conduction efficiency of the melt. At the same time, the negative pressure area formed by the concave point produces a capillary effect, making it easier for the melt to penetrate into the microscopic pores of the underlying coating layer.

[0020] 2. This high-bonding-force cable extrusion device adopts a driving method that combines permanent magnets and electromagnets to achieve stepless speed regulation of the heating rod through changes in magnetic polarity. This non-contact drive eliminates the gap error in traditional mechanical transmission and, combined with the linear motion guide of the slide rail, significantly improves the uniformity of the cable surface treatment. The electromagnetic drive system has a millisecond-level response characteristic, which can achieve instantaneous switching of the heating rod's motion state. In production scenarios where rapid adjustment of the density or depth of the pits is required, the system can complete the reconfiguration of the heating rod position within 50ms, which is faster than the response speed of hydraulic drive systems or motor drives. This high dynamic performance is particularly suitable for flexible production needs that require frequent switching of process parameters. The mechanical buffer system composed of steel springs effectively absorbs the impact energy of the movement while maintaining the high efficiency of the magnetic drive, significantly extending the service life of the core components of the equipment. Its nonlinear stiffness characteristics can also automatically adapt to the coating thickness of cables of different specifications and maintain a constant hot pressing contact pressure.

[0021] 3. The high-bonding-force cable extrusion device breaks through the limitations of traditional uniform distribution through the spiral arrangement of concave points. By controlling the phase difference of adjacent concave points, a progressive bite structure is formed in the circumferential direction of the cable. This arrangement makes the mechanical anchoring effects of each concave point staggered. When the cable is subjected to radial shear force, the stress distribution presents a spiral diffusion pattern, which effectively avoids stress concentration. The spiral arrangement makes the spacing between the concave points present a gradient change, forming a periodic material density modulation in the axial direction of the cable. This design ensures the interface bonding force while keeping the coating material at full thickness in the sparse concave point area, avoiding excessive thinning. When the molten material flows through the spiral concave points, the curvature change on the inside of the concave point triggers the Coanda effect, causing the melt flow direction to be deflected. This deflection prompts the melt to form a three-dimensional vortex flow around the concave point, generating a local tensile stress field. Under the action of this stress field, the polymer chain moves along the flow. The fibers are oriented in the direction of movement to form a microstructure similar to fiber reinforcement. This oriented structure enables the coating to effectively disperse the energy generated by local discharge when subjected to an electric field, avoiding charge concentration at material defects, thereby improving the voltage breakdown resistance. When ultrasonic inspection is used, Bragg scattering occurs when the ultrasonic wave encounters a spiral interface during propagation. Since the pits are arranged in a periodic spiral, their spatial frequency resonates with ultrasonic waves of a specific wavelength. When the wavelength of the detected sound wave matches the spiral period, constructive interference occurs at a specific angle, forming a highly directional scattering beam. This beam is like the light beam of a searchlight, which significantly enhances the defect echo in a specific direction, while the background noise is effectively suppressed. By receiving these directional scattered signals, the detection instrument can accurately determine the axial position of the defect, realize "acoustic beam scanning" defect positioning, and significantly improve the detection signal-to-noise ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the pressure point ring connection structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the cable extrusion end of the present invention;

[0025] Figure 4 This is a schematic diagram of the distribution of the pressure point ring control cavity of the present invention;

[0026] Figure 5 This is a front view of the pressure point ring of the present invention;

[0027] Figure 6 Detailed diagram of the pressure point ring of the present invention Figure 1 ;

[0028] Figure 7 Detailed diagram of the pressure point ring of the present invention Figure 2 .

[0029] In the figure: 1. Cable traction machine; 2. Screw extruder; 11. Cable extrusion end; 12. Pressure point ring; 21. Melt extrusion end; 101. Cable; 102. Cable traction chamber; 103. Infrared detector; 104. Cooling plate; 121. Fixing frame; 122. Drive block; 123. Spring; 124. Sliding block; 125. Heating rod; 1201. Control chamber; 1211. Slide rail; 1251. Hot pressing notch. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figures 1-4, a high-bonding-force cable extrusion device comprises a cable traction machine 1 and a screw extruder 2, wherein the cable traction machine 1 is provided with a crawler for pulling a cable 101, the cable traction machine 1 and the screw extruder 2 are respectively provided with a cable extrusion end 11 and a melt extrusion end 21, the cable extrusion end 11 is connected to the melt extrusion end 21, and a cable traction cavity 102 for cable movement and melt coating is provided in the cable extrusion end 11, and the melted material in the screw extruder 2 is squeezed into the cable traction cavity 102 through the melt extrusion end 21, and a pressure point ring 1 is provided in the cable extrusion end 11 and in front of the connection point of the melt extrusion end 21. 2. The pressure point ring 12 is annular, and the cable traction cavity 102 passes through the center of the pressure point ring 12. The pressure point ring 12 has a control cavity 1201 in a circumferential array. A fixing frame 121 for separating the cavities is provided between the control cavities 1201. A driving block 122 and a heating rod 125 are provided in the control cavity 1201, and a hot pressing groove 1251 for the heating rod 125 to pass through is provided on the inner side of the pressure point ring 12. The driving block 122 drives the heating rod 125 to pass through the hot pressing groove 1251, and hot presses the surface coating of the cable 101 passing through the cable traction cavity 102, leaving concave spots on the coating of the cable 101.

[0032] The cable 101 coated with a layer of insulation layer is transported by a cable traction machine 1 to a cable extrusion end 11 connected to a screw extruder 2 for a second layer of coating. The screw extruder 2 melts the insulation material and squeezes it into the cable traction cavity 102 in the cable extrusion end 11 through the molten extrusion end 21, so that the cable 101 is coated with a new insulation layer on the outside when passing through the cable traction cavity 102, thereby realizing single-layer superposition extrusion of the cable. However, because the layers of this single-layer superposition extrusion are solid superpositioned, each layer of material of the single-layer extrusion has cooled and solidified when superimposed, and cannot form a strong bond through the mutual diffusion of molecular chains in the molten state as in multi-layer co-extrusion. The layers only rely on physical adsorption or mechanical bite, and cannot form chemical bonds or molecular chain entanglement. The bonding force is weak, and interface stratification is prone to occur, which easily leads to insufficient bonding between the layers, affecting the overall performance of the cable. A pressure point ring 12 is provided in the cable extrusion end 11 and at the front end of the molten extrusion end 21. A control cavity 1201 is arranged in a circumferential array on the pressure point ring 12. The control cavity 1201 is provided with a control cavity controlled by a drive block 122 The heating rod 125 is controlled by the driving block 122 to move the heating rod 125 and contact the surface insulation layer of the cable 101 in the cable traction cavity 102, so that the high temperature of the heating rod 125 forms concave points and partially melts the surface insulation layer of the cable 101, and the cable 101 with the concave points and partially melted surface insulation layer is then coated with the molten material extruded by the melting extrusion end 21, and the surface of the cable 101 is formed with a microscopic rough surface through the concave points. When the subsequent molten material is filled and coated, the interface bonding between the two coating layers is transformed from simple physical adsorption to mechanical bite, and the shear and peeling resistance is significantly enhanced. In addition, through the heating of the heating rod 125, the surface of the coating layer of the first layer of the cable 101 is partially softened and melted, so that the subsequent melt penetrates into the concave points under pressure and molecular chain entanglement occurs, and a transition layer is formed through the diffusion of the molecular chain, blurring the interface boundary, effectively increasing the bonding force between the single-layer superimposed cable insulation layers, and at the same time, compared with the multi-layer co-extrusion device, the equipment parameters are better debugged and the equipment cost is lower.

[0033] See Figure 4-Figure 7, the fixing frames 121 on both sides of the control cavity 1201 are provided with slide rails 1211, and the slide rails 1211 are provided with movable sliding blocks 124, and the heating rod 125 is fixed on the sliding blocks 124 and moves along the slide rails 1211, and the sliding blocks 124 drive the heating rod 125 along the slide rails 1211 through the hot pressing slots 1251 to realize hot pressing on the surface coating of the cable 101 to form concave points, and the driving block 122 is a permanent magnet and is fixed on the end of the slide rail 1211 away from the hot pressing slots 1251, and the sliding blocks 124 is an electromagnet, which achieves sliding on the slide rail 1211 by changing the magnetism. When the magnetism is the same, the sliding block 124 drives the heating rod 125 to move toward the hot pressing slot 1251. When the magnetism is different, the sliding block 124 drives the heating rod 125 to move toward the driving block 122. A steel spring 123 is provided between the driving block 122 and the sliding block 124. The setting of the spring 123 increases the resistance of the sliding block 124 during movement to avoid damage to the equipment due to excessive movement speed or excessive concave spots.

[0034] The fixing frame 121 is made of magnetic isolation material to prevent the driving blocks 122 and the sliding blocks 124 in different control cavities 1201 from affecting each other.

[0035] The sliding blocks 124 can be controlled independently. During the surface treatment process of the cable 101, the sliding blocks 124 in different control cavities 1201 drive the heating rods 125 for hot pressing in a clockwise or counterclockwise order, so that the surface coating of the cable 101 forms spirally arranged pits. If the area of ​​the pits on the surface of the coating is too much, the overall thickness will become thinner, affecting the strength. The spirally arranged pits can ensure uniform distribution of the pits while avoiding excessive pit area, thereby ensuring the bonding strength.

[0036] At least two heating rods 125 are provided on the sliding block 124 , and the bottom contact surface of the heating rods 125 is arc-shaped, so that the heating rods 125 form arc-shaped concave points during hot pressing, thereby avoiding stress concentration.

[0037] The pressure point ring 12 is provided with cooling plates 104 on both sides of the heating rod 125. The cooling plates 104 are provided with pipes for the flow of coolant. The cooling plates 104 can prevent the heating rod 125 from causing the overall temperature inside the cable extrusion end 11 to be too high, causing damage to the equipment, or excessive melting of the surface coating of the cable 101, thereby reducing product quality.

[0038] An infrared detector 103 for detecting distance is provided in the cable pulling cavity 102 and at the front end of the pressure point ring 12 .

[0039] The cable extrusion end 11 is provided with a pipeline for nitrogen flow, so that the hot pressing of the heating rod 125 and the molten layer coating of the molten extrusion end 21 are completed in a nitrogen environment to avoid material oxidation.

[0040] Working principle: The cable 101 coated with a layer of insulation layer is transported by the cable traction machine 1 to the cable extrusion end 11 connected to the screw extruder 2 for the second layer coating. The screw extruder 2 melts the insulation material and squeezes it into the cable traction cavity 102 in the cable extrusion end 11 through the molten extrusion end 21, so that the cable 101 is coated with a new insulation layer on the outside when passing through the cable traction cavity 102, thereby realizing single-layer superposition extrusion of the cable. However, because the layers of this single-layer superposition extrusion are solid superposition, each layer of the single-layer extrusion material has cooled and solidified when superimposed, and cannot form a strong bond through the mutual diffusion of molecular chains in the molten state like multi-layer co-extrusion. The layers only rely on physical adsorption or mechanical bite, and cannot form chemical bonds or molecular chain entanglement. The bonding force is weak, and interface stratification is prone to occur, which easily leads to insufficient bonding between the layers, affecting the overall performance of the cable. By arranging a pressure point ring 12 in the cable extrusion end 11 and at the front end of the molten extrusion end 21, a control cavity 1201 is arranged in a circular array on the pressure point ring 12, and a drive block 1 is provided in the control cavity 1201. The heating rod 125 controlled by 22 controls the movement of the heating rod 125 through the driving block 122 to contact the surface insulation layer of the cable 101 in the cable traction cavity 102, so that the high temperature of the heating rod 125 forms concave points and partially melts the surface insulation layer of the cable 101, and the cable 101 with concave points and partially melted surface insulation layer is then coated with the molten material extruded by the melting extrusion end 21, and a microscopic rough surface is formed on the surface of the cable 101 through the concave points. When the subsequent molten material is filled and coated, the interface bonding between the two coating layers is transformed from simple physical adsorption to mechanical bite, and the shear and peeling resistance is significantly enhanced. In addition, through the heating of the heating rod 125, the surface of the coating layer of the first layer of the cable 101 is partially softened and melted, so that the subsequent melt penetrates into the concave points under pressure and molecular chain entanglement occurs, and a transition layer is formed through the diffusion of the molecular chain, blurring the interface boundary, effectively increasing the bonding force between the single-layer superimposed cable insulation layers, and at the same time, compared with the multi-layer co-extrusion device, the equipment parameters are better debugged and the equipment cost is lower.

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-bonding-force cable extrusion device, comprising a cable traction machine (1) and a screw extruder (2), wherein the cable traction machine (1) is provided with a crawler for traction of a cable (101), the cable traction machine (1) and the screw extruder (2) are respectively provided with a cable extrusion end (11) and a melt extrusion end (21), the cable extrusion end (11) and the melt extrusion end (21) are connected, and the cable extrusion end (11) is provided with a cable traction cavity (102) for cable movement and melt coating, and the melted material in the screw extruder (2) is squeezed into the cable traction cavity (102) through the melt extrusion end (21), characterized in that: A pressure point ring (12) is provided in the cable extrusion end (11) and in front of the connection point of the molten extrusion end (21). The pressure point ring (12) is annular, and the cable traction cavity (102) passes through the center of the pressure point ring (12). The pressure point ring (12) has a control cavity (1201) in a circumferential array. A fixing frame (121) for separating the cavities is provided between the control cavities (1201). A driving block (122) and a heating rod (125) are provided in the control cavity (1201). A hot pressing notch (1251) for the heating rod (125) to pass through is provided on the inner side of the pressure point ring (12). The driving block (122) drives the heating rod (125) to pass through the hot pressing notch (1251), and the surface coating of the cable (101) passing through the cable traction cavity (102) is hot-pressed, so that a concave point is left on the coating of the cable (101).

2. A high-bonding-force cable extrusion device according to claim 1, characterized in that: Slide rails (1211) are provided on the fixing frames (121) on both sides of the control chamber (1201), and movable sliding blocks (124) are provided on the slide rails (1211). The heating rod (125) is fixed on the sliding block (124) and moves along the slide rails (1211).

3. A high-bonding-force cable extrusion device according to claim 2, characterized in that: The driving block (122) is a permanent magnet and is fixed to one end of the slide rail (1211) away from the hot pressing notch (1251); the sliding block (124) is an electromagnet and achieves sliding on the slide rail (1211) by changing its magnetism.

4. The high-bonding-force cable extrusion device according to claim 3, characterized in that: A steel spring (123) is provided between the driving block (122) and the sliding block (124).

5. The high-bonding-force cable extrusion device according to claim 4, characterized in that: The fixing frame (121) is made of magnetic isolation material.

6. The high-bonding-force cable extrusion device according to claim 4, characterized in that: The sliding blocks (124) can be controlled independently. During the surface treatment process of the cable (101), the sliding blocks (124) in different control chambers (1201) drive the heating rods (125) in a clockwise or counterclockwise order to perform hot pressing, so that the surface coating of the cable (101) forms spirally arranged concave points.

7. The high-bonding-force cable extrusion device according to claim 6, characterized in that: At least two heating rods (125) are provided on the sliding block (124), and the bottom contact surfaces of the heating rods (125) are arc-shaped.

8. The high-bonding-force cable extrusion device according to claim 1, characterized in that: The pressure point ring (12) is provided with cooling plates (104) on both sides of the heating rod (125), and the cooling plates (104) are provided with pipes for coolant to flow.

9. The high-bonding-force cable extrusion device according to claim 1, characterized in that: An infrared detector (103) for detecting distance is provided in the cable pulling cavity (102) and at the front end of the pressure point ring (12).

10. A high-bonding-force cable extrusion device according to any one of claims 1 to 9, characterized in that: The cable extrusion end (11) is provided with a pipeline for nitrogen to pass through, so that the hot pressing of the heating rod (125) and the molten layer coating of the molten extrusion end (21) are completed in a nitrogen environment.

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