Insulation extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables

Abstract

This invention discloses an insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables, belonging to the field of cable insulating adhesive extrusion processing technology. It includes a frame, a feed inlet, and a die head. A screw is mounted on the frame for pushing and mixing the low-smoke halogen-free flame-retardant insulating adhesive. The die head is located at the end of the screw. It also includes a feeding section sleeve, a melting section sleeve, and a homogenizing section sleeve arranged sequentially along the extrusion direction, as well as a deflection mechanism. This invention, by separately configuring the feeding section sleeve, melting section sleeve, and homogenizing section sleeve in the barrel, allows for independent adjustment of the shear strength and pressure distribution of the low-smoke halogen-free flame-retardant insulating adhesive melt in each segment. Compared to existing integral fixed barrel structures that cannot be segmented for control, this invention effectively avoids slippage and bridging of the adhesive in the feeding section, overheating and decomposition of the flame retardant in the melting section, and extrusion fluctuations caused by uneven temperature and pressure in the homogenizing section, thus adapting to the special extrusion process requirements of low-smoke halogen-free flame-retardant adhesives.

Description

Technical Field

[0001] This invention belongs to the field of cable insulation adhesive extrusion processing technology, specifically relating to an insulation adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables. Background Technology

[0002] Low-smoke halogen-free flame-retardant insulating compounds, due to their environmentally friendly, flame-retardant, and low-smoke properties, are widely used in the insulation layer processing of twisted-pair cables. They are primarily produced by melting and mixing the compound using an extrusion device, then uniformly coating the cable conductor. Existing extrusion devices mostly employ an integrated fixed barrel with a single screw. The compound is added through the feed inlet, conveyed, sheared, and melted by the screw, and finally extruded through the die head.

[0003] Currently, in actual processing, the radial clearance between the integral barrel and the screw is a fixed value, which cannot be adjusted differently according to the state of the rubber compound in the feeding section, melting section, and homogenization section. This leads to slippage and bridging of the rubber compound in the feeding section, resulting in poor feeding stability. At the same time, the shear strength and pressure distribution of the entire barrel cannot be controlled in segments, making it difficult to match the melting and mixing process characteristics of low-smoke halogen-free flame-retardant rubber compounds. This can easily lead to problems such as uneven melt mixing and large extrusion fluctuations, affecting the molding quality of the cable insulation layer.

[0004] To avoid the aforementioned technical problems, we provide an insulating adhesive extrusion apparatus based on the processing of 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 an insulating adhesive extrusion apparatus for processing low-smoke halogen-free flame-retardant twisted-pair cables, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables, comprising a frame, a feed inlet, and a die head. A screw is mounted on the frame for pushing and mixing the low-smoke halogen-free flame-retardant insulating adhesive material. The die head is located at the end of the screw. The device also includes: The feeding section sleeve, melting section sleeve, and homogenization section sleeve are arranged sequentially along the extrusion direction; A deflection mechanism is provided to drive the feeding section sleeve, the melting section sleeve, and the homogenizing section sleeve to deflect independently around the extrusion axis. The deflection of the feeding section sleeve, melting section sleeve, and homogenization section sleeve is used to change the non-uniform radial gap along the circumference between the inner wall of the sleeve and the screw, and to independently adjust the shear strength and pressure distribution of the low-smoke halogen-free flame-retardant insulating adhesive melt in each section.

[0007] In a preferred embodiment, the deflection mechanism includes a worm gear, a worm, and a drive component. The worm gear and the worm mesh with each other, and the drive component drives the worm to rotate, thereby driving the corresponding sleeve to achieve independent deflection.

[0008] As a preferred embodiment, the frame is provided with a support frame at the bottom of the feeding section sleeve, the melting section sleeve and the homogenizing section sleeve. The support frame is provided with a limiting frame for supporting each sleeve, and the deflection mechanism is arranged on one side of the limiting frame.

[0009] In a preferred embodiment, the deflection angle of the feeding section sleeve is smaller than that of the melting section sleeve, and the deflection angle of the homogenization section sleeve is smaller than that of the melting section sleeve.

[0010] In a preferred embodiment, the molten section sleeve is provided with a kneading device, which includes multiple guide vanes, a connecting rod, a bevel gear, and a toothed disc.

[0011] In a preferred embodiment, the guide vane is rotatably mounted on the inner wall of the molten section sleeve, and the connecting rod passes through the molten section sleeve and is fixedly connected to the guide vane. The deflection of the guide vane applies a kneading action to the melt inside the molten section sleeve, which is used to break up the flame retardant agglomerates in the low-smoke halogen-free flame-retardant rubber compound.

[0012] In a preferred embodiment, the toothed disc is fixedly mounted on the limiting frame via a frame body. The center of the toothed disc is located on the axis of the sleeve. The toothed disc meshes with the bevel gear and is used to roll along the toothed disc when the sleeve in the molten section deflects, so as to drive the connecting rod and the guide vane to generate additional rotation relative to the inner wall of the sleeve.

[0013] In a preferred embodiment, a compensation device is provided at the end of the homogenization section sleeve, the compensation device comprising: An annular groove is formed on the inner wall of the end of the homogenization section sleeve, and the annular groove extends along the circumferential direction of the inner wall of the sleeve. Multiple connecting holes are evenly distributed circumferentially on the inner wall of the annular groove, and the connecting holes extend radially outward; A supplementary cavity is provided, one end of which is connected to a connecting hole.

[0014] In a preferred embodiment, a piston is provided in the supplementary cavity. The piston is axially slidably disposed in the supplementary cavity and divides the supplementary cavity into a melt cavity and a compensation cavity. The melt cavity is connected to a connecting hole. The compensation cavity is filled with compressed gas or an elastic element to stabilize the low-smoke halogen-free flame-retardant insulating rubber melt at the die inlet.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention, by dividing the barrel into a feeding section sleeve, a melting section sleeve, and a homogenizing section sleeve, and providing a deflection mechanism composed of a worm gear and a worm, enables independent and controllable deflection of each sleeve. This allows for precise adjustment of the radial clearance between the inner wall of each sleeve and the screw, and segmental independent adjustment of the shear strength and pressure distribution of the low-smoke halogen-free flame-retardant insulating adhesive melt. Compared to existing integral fixed barrel structures that cannot be segmented and controlled, this invention can specifically match the process characteristics of the adhesive in the feeding, melting, and homogenizing sections, effectively avoiding slippage and bridging of the adhesive in the feeding section, overheating and decomposition of the flame retardant in the melting section, and extrusion fluctuations caused by uneven temperature and pressure in the homogenizing section. It is suitable for the special extrusion process requirements of low-smoke halogen-free flame-retardant adhesives.

[0016] This invention utilizes a kneading device consisting of a guide vane, a connecting rod, a bevel gear, and a toothed disc, installed on the inner wall of the molten section sleeve. The guide vane is synchronously driven to rotate by the deflection of the molten section sleeve, dynamically kneading and shearing the rubber melt. Compared to the existing method that relies solely on a screw for shearing and dispersion, this invention can automatically break up flame retardant agglomerates in low-smoke halogen-free flame retardant rubber without the need for an additional independent drive source, thereby improving the uniformity of rubber compound mixing.

[0017] This invention, by setting a pressure compensation device consisting of an annular groove, a connecting hole, a supplementary cavity, and a piston at the end of the homogenization section sleeve, can utilize the compressed gas or elastic element in the compensation cavity to absorb the melt pressure pulsation at the die head inlet in real time and automatically stabilize the pressure. Compared with the existing extrusion structure without pressure compensation and relying solely on a fixed flow channel for pressure stabilization, it can quickly offset the pressure fluctuations during the extrusion process, stabilize the extrusion flow rate and molding state of the insulating rubber, effectively solve the defects of uneven wall thickness and flow marks on the surface of twisted pair cable insulation layers, and significantly improve the accuracy and appearance quality of cable insulation layer coating molding. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a schematic diagram of the deflection mechanism structure of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the kneading device of the present invention; Figure 6 This is a schematic diagram of the deflection mechanism structure of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the compensation device structure of the present invention.

[0019] In the diagram: 1. Frame; 2. Feed inlet; 3. Screw; 4. Feeding section sleeve; 5. Melting section sleeve; 6. Homogenization section sleeve; 7. Worm gear; 8. Worm; 9. Support frame; 10. Guide vane; 11. Connecting rod; 12. Bevel gear; 13. Gear disc; 14. Annular groove; 15. Connecting hole; 16. Supplementary cavity; 17. Piston; 18. Limiting frame. 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 Figures 1-7 This invention provides an insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables, comprising a frame 1, a feed inlet 2, a die head, and a drive unit. A screw 3 is mounted on the frame 1, and the drive unit is connected to the screw 3 to drive its rotation, pushing and mixing the low-smoke halogen-free flame-retardant insulating adhesive. The die head is located at the end of the screw 3 and is used to extrude the mixed low-smoke halogen-free flame-retardant insulating adhesive and coat it onto the conductor of the twisted-pair cable. The feed inlet 2 is located at the beginning of the screw 3 and is used to feed the low-smoke halogen-free flame-retardant insulating adhesive between the screw 3 and the barrel. The device also includes: The feeding section sleeve 4, the melting section sleeve 5, and the homogenization section sleeve 6 are arranged sequentially along the extrusion direction; Deflection mechanism; The deflection mechanism is used to drive the feeding section sleeve 4, the melting section sleeve 5 and the homogenizing section sleeve 6 to deflect independently around the extrusion axis; The deflection of the feeding section sleeve 4, the melting section sleeve 5, and the homogenization section sleeve 6 is used to change the non-uniform radial gap along the circumference between the inner wall of the sleeve and the screw 3, and to independently adjust the shear strength and pressure distribution of the low-smoke halogen-free flame-retardant insulating adhesive melt in each section. By independently setting different reference gaps and deflection angles for the three sleeves, precise segmented control of shear strength and pressure distribution in the feeding section, melting section, and homogenization section can be achieved. The adjacent feeding section sleeve 4, melting section sleeve 5 and homogenizing section sleeve 6 are connected by a spherical metal sealing ring and an elastic pre-tightening structure to achieve dynamic sealing. The deflection mechanism includes a worm gear 7, a worm 8, and a drive component, which is used to drive the corresponding sleeve to deflect independently. The drive component can be a servo motor. A support frame 9 is provided at the bottom of the feeding section sleeve 4, the melting section sleeve 5, and the homogenizing section sleeve 6 of the frame 1. A limiting frame 18 is provided on the support frame 9 to support the feeding section sleeve 4, the melting section sleeve 5, and the homogenizing section sleeve 6. A deflection mechanism is provided on one side of the limiting frame 18. A mounting seat is fixedly provided on one side of the limiting frame 18 for positioning the worm 8. The worm wheel 7 is sleeved on the corresponding sleeve. The output end of the servo motor is connected to the worm 8, and the corresponding sleeve is driven to rotate through the worm 8 and the worm wheel 7.

[0023] The reference radial clearance between the feeding section sleeve 4 and the screw 3 is 0.8mm-1.2mm; the reference radial clearance between the melting section sleeve 5 and the screw 3 is 0.6mm-1.0mm; the reference radial clearance between the homogenization section sleeve 6 and the screw 3 is 0.5mm-0.9mm; when the sleeve deflects, the radial clearance on the deflection direction side decreases to 0.2mm-0.6mm to locally enhance the shearing of the low-smoke halogen-free flame-retardant insulating compound melt to disperse flame retardant agglomerates; the radial clearance on the opposite deflection direction side increases to 1.2mm-2.0mm to release pressure and prevent local overheating.

[0024] Specifically, each sleeve is equipped with an angle encoder to provide real-time feedback on the sleeve's deflection angle. The deflection mechanism drives the corresponding sleeve to produce an independent deflection within the range of ±0.5° to ±3°, and can self-lock at any deflection angle to maintain the radial clearance distribution set between the inner wall of the sleeve section and the screw 3, thereby independently adjusting the shear strength and pressure distribution of the low-smoke halogen-free flame-retardant insulating rubber melt in each section.

[0025] Each of the feeding section sleeve 4, the melting section sleeve 5, and the homogenization section sleeve 6 is independently equipped with a temperature control system to independently control the temperature of the corresponding sleeve. This is to achieve coordinated adjustment of the melt temperature and shear strength of the low-smoke halogen-free flame-retardant insulating adhesive in each section, and to prevent the low-smoke halogen-free flame-retardant adhesive from slipping and bridging in the feeding section, decomposing the flame retardant due to overheating in the melting section, and causing unstable extrusion due to uneven temperature in the homogenization section. The deflection angle of the feeding section sleeve 4 is smaller than that of the melting section sleeve 5. The deflection angle of the melting section sleeve 5 is larger than that of the feeding section sleeve 4 and the homogenization section sleeve 6. The deflection angle of the homogenization section sleeve 6 is smaller than that of the melting section sleeve 5. Specifically, the deflection angle range of the feeding section sleeve 4 is 0°-±0.5°, the deflection angle range of the melting section sleeve 5 is ±1-±3°, and the deflection angle range of the homogenization section sleeve 6 is 0°-±1°. The slight deflection angle or no deflection of the feeding section sleeve 4 is used to prevent the low-smoke halogen-free flame-retardant rubber compound from slipping and bridging in the feeding section. At the same time, the slight eccentricity helps to stably pull in the granular material. The large deflection angle of the melting section sleeve 5 is used to enhance the shear dispersion and dynamic kneading of flame retardant agglomerates in low-smoke halogen-free flame retardant insulating adhesives, while the deflection angle of the homogenization section sleeve 6 is used to release pressure, prevent local scorching, and maintain stable extrusion pressure. A kneading device is provided on the molten section sleeve 5. The kneading device includes multiple guide vanes 10, connecting rods 11, bevel gears 12 and toothed discs 13. The guide vanes 10 are rotatably installed on the inner wall of the molten section sleeve 5. The connecting rods 11 pass through the molten section sleeve 5 and are fixedly connected to the guide vanes 10. The guide vanes 10 deflect to apply a kneading action to the low-smoke halogen-free flame-retardant insulating rubber melt in the molten section sleeve 5, which is used to break up the flame retardant agglomerates in the low-smoke halogen-free flame-retardant rubber. The toothed disc 13 is fixedly installed on the outside of the molten section sleeve 5 by the frame. The center of the toothed disc 13 is located on the axis of the sleeve. The toothed disc 13 meshes with the bevel gear 12. When the molten section sleeve 5 deflects, the toothed disk 13 drives the bevel gear 12 to rotate, and the bevel gear 12 drives the guide vane 10 to deflect through the connecting rod 11. The number of guide vanes 10 is 4-8, and they are evenly distributed at equal angles along the circumference of the molten section sleeve 5; Furthermore, a sealing structure is provided between the connecting rod 11 and the sleeve wall, which is a metal bellows seal or a magnetic seal. The sealing structure is used to prevent the low-smoke halogen-free flame-retardant insulating compound melt from leaking along the gap between the connecting rod 11 and the sleeve wall, while allowing the connecting rod 11 to rotate freely to transmit torque; The end of the homogenization section sleeve 6 is provided with a compensation device, which includes: An annular groove 14 is formed on the inner wall of the end of the homogenization section sleeve 6, and the annular groove 14 extends along the circumferential direction of the inner wall of the sleeve. Multiple connecting holes 15 are circumferentially distributed at the bottom of the annular groove 14, and the connecting holes 15 extend radially outward. The supplementary cavity 16 is opened inside the sleeve wall of the homogenization section sleeve 6, and one end of the supplementary cavity 16 is connected to the connecting hole 15. A piston 17 is provided inside the supplementary cavity 16. The piston 17 is axially slidably disposed inside the supplementary cavity 16 and divides the supplementary cavity 16 into a melt cavity and a compensation cavity. The melt cavity is connected to the connecting hole 15. The compensation cavity is filled with compressed gas or an elastic element to stabilize the low-smoke halogen-free flame-retardant insulating rubber melt at the entrance of the die head, and to prevent uneven wall thickness and surface flow marks of the insulation layer covering the outside of the twisted pair cable conductor due to pressure fluctuations. When the melt pressure fluctuates, the piston 17 reciprocates under the combined action of the melt pressure and the compensation chamber pressure. By changing the volume of the compensation chamber, it absorbs the pressure pulsation and stabilizes the melt pressure of the low-smoke halogen-free flame-retardant insulating rubber at the entrance of the die head mold, preventing uneven insulation layer thickness and surface flow marks caused by pressure fluctuations. Specifically, the compressed gas is nitrogen, and the pre-charge pressure of the compressed gas is 0.6 to 0.9 times the average extrusion pressure. The pre-charge pressure range is used to keep the piston 17 in the middle position of the supplementary chamber 16 in the working state, so as to obtain the maximum pressure absorption stroke and the best pulsation suppression effect. The elastic element can be a helical spring or a disc spring assembly; The elastic element is used to provide a compensating force proportional to the displacement of piston 17 to accommodate pressure pulsations of different frequencies and amplitudes.

[0026] Working principle and usage process of this invention: Low-smoke halogen-free flame-retardant insulating adhesive is fed into the feed inlet 2. The screw 3 is started to rotate, and the adhesive is pushed by the screw into the feeding section sleeve 4, the melting section sleeve 5, and the homogenization section sleeve 6 in sequence. The servo motors of each deflection mechanism are started, and according to the feedback of the angle encoder, the worm gear 8 and worm wheel 7 are driven to precisely adjust each section sleeve to the preset deflection angle and self-lock. Low-smoke halogen-free flame-retardant insulating compound is fed into the feed inlet 2. The screw 3 on the frame 1 rotates to push and mix the compound. The support frame 9 and the limiting frame 18 support and position the feeding section sleeve 4, the melting section sleeve 5, and the homogenizing section sleeve 6. The deflection mechanism consists of a worm wheel 7, a worm 8, and a servo motor. The servo motor drives the worm 8 to rotate the worm wheel 7, which in turn drives the feeding section sleeve 4, the melting section sleeve 5, and the homogenizing section sleeve 6 to deflect independently around the extrusion axis. Each sleeve is equipped with an angle encoder to provide real-time feedback of the deflection angle, and can self-lock at any angle within the range of ±0.5° to ±3°, changing the radial clearance between the inner wall of the sleeve and the screw 3, and independently adjusting the shear strength and pressure distribution of the melt in each segment of the compound.

[0027] The adjacent feeding section sleeve 4, melting section sleeve 5, and homogenizing section sleeve 6 are connected by a spherical metal sealing ring and an elastic pre-tightening structure to achieve dynamic sealing, which allows the sleeve to deflect while preventing rubber leakage. Each of the three sleeves is equipped with an independent temperature control system to achieve coordinated control of the melt temperature and shear strength of each section, avoiding rubber slippage and bridging in the feeding section, overheating and decomposition of flame retardant in the melting section, and unstable extrusion caused by uneven temperature in the homogenizing section. The deflection angle of the feeding section sleeve 4 is 0°-±0.5°. With slight deflection or no deflection, it prevents the low-smoke halogen-free flame-retardant rubber material from slipping and bridging. At the same time, it helps to stably pull in the granular material with the help of slight eccentricity. The deflection angle range of the molten section sleeve 5 is ±1° to ±3°. The maximum deflection amplitude is adopted to enhance the shearing dispersion and dynamic kneading effect on flame retardant agglomerates in the rubber compound. The homogenization section sleeve 6 has a deflection angle range of 0°-±1°. Appropriate deflection releases the internal pressure of the melt, avoids local scorching of the rubber compound, and maintains a stable extrusion pressure benchmark.

[0028] The inner wall of the molten section sleeve 5 has 4-8 guide vanes 10 evenly distributed at equal angles around the circumference. The guide vanes 10 are connected to the bevel gear 12 through the sleeve wall via the connecting rod 11. The outer wall of the molten section sleeve 5 is provided with a toothed disk 13 that meshes with the bevel gear 12. When the molten section sleeve 5 deflects, the gear plate 13 is fixed, driving the bevel gear 12 to rotate, and then the guide plate 10 is driven to deflect synchronously through the connecting rod 11, which dynamically kneads the internal rubber melt, fully dispersing the flame retardant agglomerates. A metal bellows seal or magnetic seal structure is set between the connecting rod 11 and the sleeve wall, which can prevent the rubber melt from leaking along the gap, and does not restrict the connecting rod 11 from freely rotating to transmit torque. An annular groove 14 is opened on the inner wall of the end of the homogenization section sleeve 6. Radial connecting holes 15 are evenly distributed around the bottom of the annular groove 14. The connecting holes 15 communicate with the supplementary cavity 16 inside the sleeve wall. A piston 17 is axially slidably installed in the supplementary cavity 16. The compensation cavity behind the piston 17 is filled with pre-charged nitrogen or equipped with elastic elements such as helical springs and disc springs.

[0029] When the melt pressure at the die inlet fluctuates, the piston 17 slides back and forth under the combined action of the melt pressure and the pre-tightening force of the compensation chamber, changing the volume of the supplementary chamber 16 to absorb pressure pulsations. The nitrogen pre-charge pressure is set to 0.6-0.9 times the average extrusion pressure, so that the piston 17 is in the middle position of the chamber to obtain the maximum pressure stabilization stroke. The elastic element can adapt to pressure fluctuations of different frequencies and amplitudes, stabilize the melt pressure at the die inlet, and eliminate uneven insulation layer thickness and surface flow marks defects in twisted pair cables.

[0030] 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. An insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables, comprising a frame (1), a feed inlet (2), a screw (3), and a die head, wherein the die head is disposed at the end of the screw (3), characterized in that: Also includes: The feeding section sleeve (4), the melting section sleeve (5) and the homogenization section sleeve (6) are arranged sequentially along the extrusion direction. A deflection mechanism is provided to drive the feeding section sleeve (4), the melting section sleeve (5) and the homogenizing section sleeve (6) to deflect independently around the extrusion axis. The deflection of the feeding section sleeve (4), melting section sleeve (5) and homogenization section sleeve (6) is used to change the non-uniform radial gap between the inner wall of the sleeve and the screw (3) along the circumference, and independently adjust the shear strength and pressure distribution of the low smoke halogen-free flame retardant insulating adhesive melt in each section.

2. The insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables according to claim 1, characterized in that: The deflection mechanism includes a worm wheel (7), a worm (8) and a drive component. The worm wheel (7) meshes with the worm (8), and the drive component is used to drive the worm (8) to rotate, thereby driving the corresponding sleeve to achieve independent deflection.

3. The insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables according to claim 2, characterized in that: The deflection angle of the feeding section sleeve (4) is smaller than that of the melting section sleeve (5), and the deflection angle of the homogenization section sleeve (6) is smaller than that of the melting section sleeve (5).

4. The insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables according to claim 3, characterized in that: The molten section sleeve (5) is provided with a kneading device, which includes multiple guide vanes (10), connecting rods (11), bevel gears (12) and toothed discs (13).

5. The insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables according to claim 4, characterized in that: The guide plate (10) is rotatably installed on the inner wall of the molten section sleeve (5). The connecting rod (11) passes through the molten section sleeve (5) and is fixedly connected to the guide plate (10). The guide plate (10) deflects and applies a kneading action to the melt in the molten section sleeve (5) to disperse the flame retardant agglomerates in the low smoke halogen-free flame retardant rubber.

6. The insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables according to claim 5, characterized in that: The center of the toothed disc (13) is located on the axis of the sleeve. The toothed disc (13) meshes with the bevel gear (12) and is used to roll along the toothed disc (13) when the sleeve (5) in the molten section deflects, so as to drive the connecting rod (11) and the guide vane (10) to generate additional rotation relative to the inner wall of the sleeve.

7. The insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables according to claim 3, characterized in that: The end of the homogenization section sleeve (6) is provided with a compensation device, the compensation device comprising: An annular groove (14) is formed on the inner wall of the end of the homogenization section sleeve (6), and the annular groove (14) extends along the circumferential direction of the inner wall of the sleeve. Multiple connecting holes (15) are evenly distributed circumferentially on the inner wall of the annular groove (14), and the connecting holes (15) extend radially outward; A supplementary cavity (16) is provided, one end of which is connected to a connecting hole (15).

8. The insulating adhesive extrusion device for processing low-smoke halogen-free flame-retardant twisted-pair cables according to claim 7, characterized in that: A piston (17) is provided inside the supplementary cavity (16). The piston (17) is axially slidably disposed inside the supplementary cavity (16) and divides the supplementary cavity (16) into a melt cavity and a compensation cavity. The melt cavity is connected to the connecting hole (15). The compensation cavity is filled with compressed gas or elastic elements to stabilize the low-smoke halogen-free flame-retardant insulating rubber melt at the entrance of the die head.

Images