Low-smoke halogen-free cable concentricity self-adaptive extrusion device

Abstract

The application is suitable for the technical field of cable extrusion equipment, and provides a low-smoke and halogen-free cable concentricity self-adaptive extrusion device, which comprises an extrusion host, a wire inlet support, an extrusion die head, a die core and a die sleeve, a dynamic stable wire centering unit is arranged between the wire inlet support and the feeding side of the extrusion host; the dynamic stable wire centering unit comprises a fixed base, an axis adjusting mechanism, an adjusting bottom plate, an annular frame, an annular sleeve, a friction driving mechanism and a counterweight deviation correction centering clamping mechanism, the friction driving mechanism is provided with two independent floating inclined friction wheels, the circumferential friction component force generated by the cable core running is used to drive the revolution of the annular sleeve, the self-adaptive fine adjustment assembly and the elastic pressure assembly are matched, the problem of slipping and losing rotation in the eccentricity working condition is solved; the counterweight deviation correction centering clamping mechanism revolves with the annular sleeve, relies on the variable radius differential centrifugal negative feedback to form a deviation correction closed loop, realizes the dynamic centering correction of the unilateral deviation of the cable core, improves the driving stability and the wire inlet centering precision, and improves the extrusion concentricity of the cable.

Description

Technical Field

[0001] This invention belongs to the technical field of cable extrusion equipment, and particularly relates to an adaptive extrusion device for the concentricity of low-smoke halogen-free cables. Background Technology

[0002] Low-smoke halogen-free cables are widely used in core applications such as rail transit, high-rise buildings, and power communications due to their excellent flame-retardant, low-smoke, non-toxic, and environmentally friendly properties. The cable extrusion process is a key process that determines the concentricity of the insulation, electrical safety, and service life of the product. During the cable extrusion process, factors such as radial runout of the cable core, tension fluctuations, wire feeding deviation, and equipment installation deviations can easily cause insulation layer eccentricity. This can lead to local electric field concentration and reduced withstand voltage performance of the cable, as well as waste of insulation materials and a lower product qualification rate.

[0003] The existing concentricity adaptive extrusion device for low-smoke halogen-free cables consists of a fixed frame, fixed double-tilted friction wheels, a rotating sleeve, and a circumferentially fixed counterweight clamping assembly. It relies on the sliding friction between the two sets of tilted friction wheels at fixed angles and the cable core. The frictional force drives the rotating sleeve to revolve, and the sleeve drives the outer circumferential counterweight clamping assembly to rotate synchronously. Centrifugal force is used to clamp the cable core, achieving conventional infeed limit alignment. However, the existing device still has certain technical shortcomings in practical applications:

[0004] Firstly, the existing fixed double-tilted friction wheel adopts a fixed tilt angle and rigid linkage structure. The two wheels have no independent floating and adaptive capability. When the cable core has a slight radial wobble, there will be a phenomenon of one-sided contact or one-sided separation, and the contact pressure of the contact surface is uneven. Moreover, the traditional structure is pure sliding friction. With the fixed tilt angle, it cannot compensate for the torque loss caused by the wobble. The talcum powder, insulating dust and oil stains attached to the surface of the cable core will further aggravate the slippage, loss of rotation and stall problems, directly leading to the failure of the centering function.

[0005] Secondly, existing circumferential fixed counterweight clamping components are generally designed with a fixed rotation radius and symmetrical centrifugal force. They can only provide simple limits for instantaneous vibrations and cannot identify and correct unilateral continuous steady-state radial offset caused by wire feeding deviation, equipment installation skew, or traction deviation. Over long-term production, the eccentricity continues to accumulate, and the only solution is to frequently stop the machine manually to adjust the mold, resulting in poor production continuity and low product concentricity consistency.

[0006] Therefore, in view of the above situation, there is an urgent need to develop a low-smoke halogen-free cable concentricity adaptive extrusion device to overcome the shortcomings in current practical applications. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a low-smoke halogen-free cable concentricity adaptive extrusion device to solve the problems mentioned in the background.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A low-smoke halogen-free cable concentricity adaptive extrusion device includes an extruder, a wire inlet bracket, an extrusion die, a die core, and a die sleeve. A dynamic wire stabilization and alignment unit is assembled between the wire inlet bracket and the feed side of the extruder. The dynamic wire stabilization and alignment unit consists of a fixed base, a shaft adjustment mechanism, an adjustment base plate, an annular frame, a bearing, an annular sleeve, a friction drive mechanism, and a counterweight correction and alignment clamping mechanism. The fixed base is fixed between the wire inlet bracket and the feed side of the extruder. The shaft adjustment mechanism is assembled on the fixed base. An adjustment base plate is fixed on the adjustment end of the shaft adjustment mechanism. An annular frame is coaxially fixed at both ends of the adjustment base plate. The left and right ends of the annular sleeve are rotatably installed in the two annular frames through bearings.

[0010] The friction drive mechanism is arranged symmetrically up and down and independently mounted on the outer wall of the left end of the annular sleeve. The two sets of friction drive mechanisms float independently. Each set of friction drive mechanisms includes a fixed sleeve, a slide block, an inclined friction wheel, a wheel axle, an adaptive fine-tuning component, and an elastic pressure component. The two fixed sleeves are arranged symmetrically up and down and radially fixed on the outer wall of the left side of the annular sleeve. A slide block is radially slidably installed inside each of the two fixed sleeves. The inclined friction wheel is inclinedly mounted on the inner side of the slide block through the wheel axle. The axis of the inclined friction wheel forms a constant helical angle with the axis of the cable core. The end faces of the two inclined friction wheels that are close to each other rub against the upper and lower outer contours of the cable core, respectively. The adaptive fine-tuning component and the elastic pressure component are correspondingly matched to each slide block. The adaptive fine-tuning component is connected to the wheel axle, and the elastic pressure component is connected to the outer side of the fixed sleeve.

[0011] The counterweight correction and centering clamping mechanism is equidistantly distributed along the circumferential axis of the annular sleeve on the outer wall of the right side of the annular sleeve. The counterweight correction and centering clamping mechanism includes a guide cylinder, a counterweight correction assembly, and a centering clamping assembly. The guide cylinder is equidistantly distributed along the circumferential axis of the annular sleeve and radially fixed on the outer wall of the right side of the annular sleeve. The counterweight correction assembly is radially slidably arranged inside the guide cylinder. The centering clamping assembly connected to the counterweight correction assembly is installed on the inner outer wall of the guide cylinder. The counterweight correction assembly generates centrifugal force as the annular sleeve revolves and drives the clamping end of the centering clamping assembly to retract radially.

[0012] As a further technical solution of the present invention, the two inclined friction wheels are arranged symmetrically at 180° up and down, the spatial helical deflection angle of the inclined friction wheels is 18-28°, and the helical deflection angles of the two inclined friction wheels are in the same direction, and they are superimposed to form a circumferential driving torque in the same direction.

[0013] As a further technical solution of the present invention, the adaptive fine-tuning component includes a fine-tuning pin, a bracket, and a fine-tuning torsion spring. The bracket is arranged parallel to both sides of the axial direction of the inclined friction wheel. One end of the bracket is equipped with a fine-tuning pin, and one end of the fine-tuning pin is slidably embedded in the arc-shaped grooves symmetrically opened on both sides of the slide block. The other end of the bracket is coaxially connected to the wheel axle. The inclined friction wheel is mounted between the two brackets through the wheel axle. One end of the fine-tuning torsion spring is assembled on the extended end of the wheel axle, and the other end of the fine-tuning torsion spring is assembled on the outer wall of the slide block.

[0014] As a further technical solution of the present invention, the elastic pressure assembly includes a pressure stud, a pressure plate, a pressure spring, and a pressure nut. The pressure stud is parallel to the fixed sleeve and symmetrically fixed on the outer end face of the fixed sleeve. The pressure plate is radially sleeved on the pressure stud. The pressure plate is fixedly connected to the outer end face of the slide. The outer end of the pressure stud is threaded with a pressure nut. The inner end face of the pressure nut abuts against the outer side face of the pressure plate. The outer side of the pressure stud is coaxially sleeved with a pressure spring. The two ends of the pressure spring abut against the inner side face of the pressure plate and the outer end face of the fixed sleeve, respectively.

[0015] As a further technical solution of the present invention, the counterweight correction assembly includes a counterweight column, a counterweight base, a counterweight block, an upper magnetic chuck, and a lower magnetic chuck. The counterweight block is radially slidably installed inside the guide cylinder. The counterweight base is fixed to the extended end of the counterweight block. The counterweight block is mounted on the outer end face of the counterweight base. The outer wall of one inner end of the counterweight column is connected to the corresponding centering clamping assembly. The upper magnetic chuck is symmetrically installed at the bottom of the counterweight base. Two bosses are symmetrically arranged on the outer end face of the annular sleeve along the axis of the guide cylinder. The bosses are integrally formed with the annular sleeve. The lower magnetic chuck is symmetrically fixed to the top surface of the bosses. The upper magnetic chuck and the lower magnetic chuck are arranged with opposite poles.

[0016] As a further technical solution of the present invention, a limiting platform is fixed on the outer wall of the counterweight column, and the limiting platform intermittently abuts against the outer end face of the guide cylinder. The limiting platform is used to limit the inward movement of the counterweight column.

[0017] As a further technical solution of the present invention, a rectangular notch is axially opened at one end of the inner side of the guide cylinder, and side frames are symmetrically fixed on both sides of the rectangular notch. A fixed sliding shaft that slides and cooperates with the centering clamping assembly is transversely inserted between the two side frames.

[0018] As a further technical solution of the present invention, the centering clamping assembly includes a hinge frame, a centering connecting rod, a strip groove, and a centering clamping plate. The hinge frame is fixed on the inner end wall of the counterweight column. One end of the centering connecting rod passes through a rectangular notch and is rotatably connected to the hinge frame. A strip groove is provided in the middle of the centering connecting rod to slide with a fixed sliding shaft. The other end of the centering connecting rod is inclined to the guide cylinder and is equipped with a centering clamping plate. The inner end face of the centering clamping plate intermittently abuts against the outer contour of the cable core.

[0019] As a further technical solution of the present invention, the inner end face of the centering plate is configured as a concave arc-shaped surface that matches the arc-shaped outer contour of the cable core, and a plurality of sliding balls are equidistantly embedded on the inner end face of the centering plate along the axial direction.

[0020] As a further technical solution of the present invention, the shaft adjustment mechanism includes a positioning column, an adjusting stud, and an adjusting nut. The positioning column is vertically fixed to the top of the fixed base. The adjusting stud is parallel to the positioning column and fixed to the top of the fixed base. The adjusting base plate is vertically slidably sleeved on the outside of the positioning column of the adjusting stud. The threaded section of the adjusting stud is equipped with an adjusting nut. The upper surface of the adjusting nut abuts against the bottom of the adjusting base plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The friction drive mechanism adopts a dual-group independent floating and adaptive tilt angle fine-tuning design. When the cable core is traveling, it forms an inclined friction pair with the cable core. This friction force can be decomposed into axial friction force and circumferential friction force. The circumferential friction force can drive the annular sleeve to rotate at a constant speed. It retains the natural advantages of the dual-wheel structure in terms of simplicity, compactness and low manufacturing cost, and also solves the inherent defects of traditional fixed tilt angle dual-wheels that slip or lose rotation when wobbling. Under wobbling conditions, the driving torque is continuous and uninterrupted, and the driving stability and working condition adaptability are significantly improved. In addition, the rolling friction composite structure further reduces the wear rate of the wheel surface and the travel resistance of the cable core, avoids spiral scratches on the surface of the cable core, and takes into account both driving reliability and cable core surface protection.

[0023] The counterweight correction and centering clamping mechanism can revolve with the annular sleeve and form a natural correction closed loop through variable radius differential centrifugal negative feedback. It can not only complete the initial dynamic centering guidance of the cable core, but also generate a stable reverse correction thrust for continuous radial offset on one side, realizing dynamic adaptive centering correction of the cable core. It breaks through the performance bottleneck of traditional centrifugal centering structure that can only passively limit or cannot actively correct steady-state deviation, and significantly improves the consistency of concentricity of extruded cables.

[0024] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the dynamic stabilizing and centering unit in the low-smoke halogen-free cable concentricity adaptive extrusion device provided in an embodiment of the present invention.

[0026] Figure 2 for Figure 1 A front view of the central unit structure viewed from the side by the dynamic stability line.

[0027] Figure 3 for Figure 1 The front view of the structure at the left end of the centering unit of the dynamic stabilizing line.

[0028] Figure 4 for Figure 1 The front view of the structure at the right end of the centering unit of the dynamic stability line.

[0029] Figure 5 for Figure 1 Assembly diagram of the middle annular sleeve and its upper components.

[0030] Figure 6 for Figure 5 A structural side view.

[0031] Figure 7 for Figure 6 Enlarged view of the friction drive mechanism.

[0032] Figure 8 for Figure 7 A bottom view of the structure of the friction drive mechanism.

[0033] Figure 9 for Figure 5 A schematic diagram of the centering and clamping mechanism for correcting the alignment of the center weight.

[0034] Figure 10 for Figure 9 Enlarged view of the structure of the single counterweight correction and centering clamping mechanism.

[0035] Figure 11 for Figure 10 A bottom view of the structure of the centering and clamping mechanism for correcting the alignment of the center weight.

[0036] Reference numerals: 100-Fixed base, 110-Shaft adjustment mechanism, 111-Positioning pin, 112-Adjusting stud, 113-Adjusting nut, 200-Adjusting base plate, 210-Annular frame, 220-Bearing, 300-Annular sleeve, 310-Boss, 400-Friction drive mechanism, 410-Fixed sleeve, 420-Slide block, 421-Arc-shaped slide groove, 430-Inclined friction wheel, 440-Wheel axle, 450-Adaptive fine-tuning component, 451-Fine-tuning pin, 452-Bracket, 453-Fine-tuning torsion spring, 460-Elastic pressure application component, 46 1-Pressure stud, 462-Pressure plate, 463-Pressure spring, 464-Pressure nut, 500-Counterweight correction and centering clamping mechanism, 510-Guide cylinder, 511-Rectangular notch, 512-Side frame, 513-Sliding shaft, 520-Counterweight correction assembly, 521-Counterweight column, 522-Counterweight seat, 523-Counterweight block, 524-Upper magnetic suction component, 525-Lower magnetic suction component, 530-Centering clamping assembly, 531-Hinged frame, 532-Centering connecting rod, 533-Strip groove, 534-Centering clamping plate, 540-Limiting platform, 600-Cable core. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0039] like Figures 1 to 11As shown, an embodiment of the present invention provides a concentricity adaptive extrusion device for low-smoke halogen-free cables, comprising an extruder, a wire inlet bracket disposed on the feeding side of the extruder, an extrusion die installed on the discharge end of the extruder, and a die core and a die sleeve coaxially arranged inside the extrusion die. The die core has a through hole at its center for the cable core 600 to pass through. An annular extrusion groove is provided between the die core and the die sleeve. A dynamic wire stabilization and alignment unit is assembled between the wire inlet bracket and the feeding side of the extruder. The dynamic wire stabilization and alignment unit consists of a fixed base 100, a shaft adjustment mechanism 110, an adjustment base plate 200, an annular frame 210, a bearing 220, an annular sleeve 300, a friction drive mechanism 400, and a counterweight correction and alignment clamping mechanism 500. The fixed base 100 is fixed to the wire inlet bracket and the feeding side of the extruder. Between the material sides, the fixed base 100 is equipped with a shaft adjustment mechanism 110. The adjustment end of the shaft adjustment mechanism 110 is fixed with an adjustment base plate 200. Both the front and rear ends of the adjustment base plate 200 are coaxially fixed with ring frames 210. The left and right ends of the ring sleeve 300 are rotatably installed in the two ring frames 210 through bearings 220. The shaft adjustment mechanism 110 can change the vertical height of the adjustment base plate 200 and the ring frame 210, thereby changing the vertical height of the ring sleeve 300, so that the shaft of the ring sleeve 300 is raised and lowered to a height that coincides with the axis of the cable core 600. This can quickly adapt to the production needs of cable cores 600 with different wire diameters and different wire laying heights. It can also eliminate the cumulative error of equipment installation by coarsely adjusting the reference shaft, and ensure that the wire inlet reference is initially coaxial with the mold core.

[0040] The friction drive mechanism 400 is arranged symmetrically vertically and independently mounted on the outer wall of the left end of the annular sleeve 300. The two sets of friction drive mechanisms 400 float independently of each other. Each set of friction drive mechanisms 400 includes a fixed sleeve 410, a slide block 420, an inclined friction wheel 430, a wheel axle 440, an adaptive fine-tuning component 450, and an elastic pressure application component 460. The two fixed sleeves 410 are arranged symmetrically vertically and radially fixed to the outer wall of the left end of the annular sleeve 300. A slide block 420 is radially slidably mounted inside each of the two fixed sleeves 410. The inclined friction wheel 430 is connected to the wheel axle. Shaft 440 is obliquely mounted inside slide 420. The axis of the oblique friction wheel 430 forms a constant helical angle with the axis of the cable core 600, and the end faces of the two oblique friction wheels 430 that are close to each other respectively rub against the upper and lower outer contours of the cable core 600. The adaptive fine-tuning component 450 and the elastic pressure component 460 are respectively matched to each slide 420. The adaptive fine-tuning component 450 is connected to the wheel shaft 440, and the elastic pressure component 460 is connected to the outer side of the fixed sleeve 410, independently providing radial preload thrust to the corresponding slide 420 to ensure that the friction wheel is always in close contact with the surface of the cable core 600.

[0041] The counterweight correction and centering clamping mechanism 500 is equidistantly distributed along the circumferential axis of the annular sleeve 300 on the outer wall of the right side of the annular sleeve 300. The counterweight correction and centering clamping mechanism 500 includes a guide cylinder 510, a counterweight correction assembly 520, and a centering clamping assembly 530. The guide cylinder 510 is equidistantly distributed along the circumferential axis of the annular sleeve 300 and radially fixed on the outer wall of the right side of the annular sleeve 300. The counterweight correction assembly 520 is radially slidably disposed inside the guide cylinder 510. The guide cylinder 510 has an inner outer wall with a centering clamping component 530 connected to the counterweight correction component 520. The counterweight correction component 520 generates centrifugal force as it revolves with the annular sleeve 300, which can drive the clamping end of the centering clamping component 530 to retract or open radially. When the cable core 600 has a unilateral radial offset, the rotation radius of the offset side counterweight correction component 520 increases synchronously, forming an asymmetric differential centrifugal force, which drives the corresponding centering clamping component 530 to output a directional reverse correction force.

[0042] Specifically, during the axial movement of the cable core 600, its upper and lower outer walls form an inclined friction pair with the two inclined friction wheels 430. Since the two inclined friction wheels 430 are arranged in a spiral inclination, the friction force between them and the cable core 600 is decomposed into an axial friction component and a circumferential friction component. The circumferential friction component can drive the annular sleeve 300 to rotate uniformly. At the same time, the adaptive fine-tuning component 450 can dynamically correct the inclination angle of the wheel axle 440 and the inclined friction wheel 430 to ensure that the driving torque is continuous and not lost, and to avoid slippage. During the rotation of the annular sleeve 300, it drives all the counterweight correction and centering clamping mechanisms 500 to rotate synchronously. The counterweight correction component 520 generates centrifugal force through rotation and drives the clamping end of the centering clamping component 530 to move towards the outer wall of the cable core 600. All the centering clamping components 530 roll and abut against the outer wall of the cable core 600 under the action of centrifugal force, thereby completing the initial centering guidance of the cable core 600.

[0043] When the cable core 600 experiences unilateral radial offset, the adaptive fine-tuning component 450 can automatically increase the tilt angle of the tilting friction wheel 430 on the offset side, thereby increasing the proportion of its circumferential friction force and simultaneously enhancing the driving torque. Meanwhile, the tilting friction wheel 430 on the opposite side follows the action of the elastic pressure component 460, ensuring that the two tilting friction wheels 430 always fit the outer contour of the cable core 600 and achieve continuous torque output, thus avoiding slippage, derailment, and loss of rotation under sway conditions.

[0044] Simultaneously, the cable core 600 presses against the inclined friction wheel 430 on the offset side and drives the counterweight correction component 520 on that side to move radially outward, thereby changing the rotation radius of the counterweight correction component 520 on the offset side. This results in a higher rotational centrifugal force on the offset side and a lower centrifugal force on the opposite side, forming an asymmetric differential centrifugal force. This makes the clamping force on the offset side stronger and the clamping force on the opposite side relatively weaker. The resultant force of the two forces always points towards the central axis of the annular sleeve 300, thereby forming a continuous reverse correction thrust and pushing the cable core 600 to gradually move back to the initial axis position. The greater the offset of the cable core 600, the stronger the differential centrifugal force becomes, and the correction force also increases synchronously, thus forming a negative feedback closed loop and realizing the dynamic adaptive centering correction of the cable core 600.

[0045] It should be noted that the two inclined friction wheels 430 are arranged symmetrically at 180° vertically. The spatial helical angle of the inclined friction wheels 430 is preferably 18-28°, and the helical angles of the two inclined friction wheels 430 are in the same direction, and they are superimposed to form a circumferential driving torque in the same direction. This ensures that the radial components of the two inclined friction wheels 430 are equal in magnitude and opposite in direction, thus canceling each other out and preventing the annular sleeve 300 from experiencing uneven wear or runout due to unilateral radial force, ensuring the smooth revolution of the annular sleeve 300. On the other hand, the design of the consistent helical direction allows the circumferential friction components of the two inclined friction wheels 430 to be completely superimposed in the same direction, resulting in double the output of driving torque and preventing the occurrence of partial friction. In cases where forces cancel each other out, the inclined friction wheel 430 preferably adopts an embedded ball-type rolling friction structure. Its inclined working surface is provided with micro-diamond anti-slip texture, forming an inclined rolling friction composite pair, which eliminates the slippage defect of sliding friction from the structure. The embedded ball structure allows the inclined friction wheel 430 to roll freely along the axial direction of the cable core 600. The main contact mode between the cable core 600 and the wheel surface is rolling friction, which has low friction loss and significantly reduces wheel surface wear and cable core 600 travel resistance. The micro-diamond anti-slip texture of the wheel surface provides circumferential biting friction force on the basis of rolling contact, ensuring that the inclined wheel surface can stably transmit the circumferential component force and will not slip or lose rotation due to pure rolling.

[0046] like Figures 5 to 8As shown, in a preferred embodiment of the present invention, the adaptive fine-tuning component 450 includes a fine-tuning pin 451, a bracket 452, and a fine-tuning torsion spring 453. The bracket 452 is arranged parallel to both sides of the inclined friction wheel 430. One end of the bracket 452 is equipped with the fine-tuning pin 451, and one end of the fine-tuning pin 451 is slidably embedded in the arc-shaped grooves 421 symmetrically opened on both sides of the slide block 420. The other end of the bracket 452 is coaxially connected to the wheel axle 440. The inclined friction wheel 430 is mounted between the two brackets 452 through the wheel axle 440. One end of the fine-tuning torsion spring 453 is equipped on the extended end of the wheel axle 440, and the other end of the fine-tuning torsion spring 453 is equipped on the outer wall of the slide block 420.

[0047] Specifically, when the cable core 600 is in the center position, the fine-tuning torsion spring 453 provides a constant initial preload torque, which drives the inclined friction wheel 430 to maintain the designed reference helical angle through the support bracket 452. At this time, the fine-tuning pin 451 is stopped at the initial position of the arc-shaped groove 421, the inclination angles of the two friction wheels are consistent and the contact pressure is balanced, and the circumferential friction component generated by the axial movement of the cable core 600 is stably output, driving the annular sleeve 300 to rotate at a constant speed. When the cable core 600 wobbles radially and is pressed against the inclined friction wheel 430 on one side, the lateral component force generated by the cable core 600 on the wheel surface will overcome the resistance of the fine-tuning torsion spring 453 and push the bracket 452 to deflect slightly. At the same time, the fine-tuning pin 451 moves along the arc-shaped groove. 421 slides to one end, and the helical angle of the inclined friction wheel 430 on that side automatically increases. After the inclination angle of the inclined friction wheel 430 increases, the circumferential component of the friction force of the cable core 600 increases simultaneously, and the driving torque automatically increases. This just offsets the problem of poor contact surface fit caused by the sway, ensuring that the side can still output torque stably without loss of rotation or slippage. When the sway of the cable core 600 decreases and the lateral extrusion force weakens, the reset torque of the fine-tuning torsion spring 453 will drive the bracket 452 to rotate in the opposite direction. The fine-tuning pin 451 will retract along the arc-shaped slide groove 421 to the initial position, and the inclination angle of the inclined friction wheel 430 will gradually fall back to the reference value, avoiding excessive axial resistance or increased local wear on the wheel surface due to excessive inclination angle.

[0048] like Figures 5 to 8As shown, in a preferred embodiment of the present invention, the elastic pressure assembly 460 includes a pressure stud 461, a pressure plate 462, a pressure spring 463, and a pressure nut 464. The pressure stud 461 is parallel to the fixed sleeve 410 and symmetrically fixed on the outer end face of the fixed sleeve 410. The pressure plate 462 is radially sleeved on the pressure stud 461. The pressure plate 462 is fixedly connected to the outer end face of the slide block 420. The outer end of the pressure stud 461 is threaded with the pressure nut 464. The inner end face of the pressure nut 464 abuts against the outer side face of the pressure plate 462. The outer side of the pressure stud 461 is coaxially sleeved with the pressure spring 463. The two ends of the pressure spring 463 abut against the inner side face of the pressure plate 462 and the outer end face of the fixed sleeve 410, respectively.

[0049] Specifically, in the initial state, based on the wire diameter, material, and production speed of the cable core 600, the pressure nut 464 is rotated inward along the pressure stud 461. The pressure nut 464 pushes the pressure plate 462 to compress the pressure spring 463, adjusting the initial preload to the set value. Sufficient preload ensures adequate contact pressure between the inclined friction wheel 430 and the cable core 600, preventing slippage during normal production. For small-diameter or ultra-thin insulated cable cores 600, the preload is reduced to prevent damage to the inner insulation layer, flexibly adapting to the production needs of different products. When the cable core 600 is at the central axis position, the compression of the upper and lower sets of pressure springs 463 is consistent, and the output preload thrust is equal. The two inclined friction wheels 430 are symmetrically pressed against the upper and lower surfaces of the cable core 600, and the wheel surface contact pressure is uniform and stable, ensuring continuous output of circumferential friction force and driving the annular sleeve 300 to rotate smoothly at a uniform speed.

[0050] When the cable core 600 experiences unilateral radial offset, the offset cable core 600 will press against the inclined friction wheel 430, pushing the slide block 420 to slide outward along the fixed sleeve 410. Simultaneously, it will drive the pressure plate 462 to slide outward along the pressure stud 461, further compressing the pressure spring 463. The reaction force of the pressure spring 463 will increase synchronously, ensuring that the wheel surface is always firmly attached to the cable core 600 and does not come off. At the same time, the pressure spring 463 on the opposite side will release its elastic potential energy, pushing the pressure plate 462 and the slide block 420 to follow inward, and driving the inclined friction wheel 430 on the opposite side to always keep in contact with the cable core 600 as it offsets. The back-and-forth movement of the inclined friction wheels 430 on both sides can ensure that both wheels are in close contact with the cable core 600 throughout the entire yaw process, providing a basic guarantee for the continuous output of drive torque from the contact pressure level. Combined with the tilt angle torque increase of the adaptive fine-tuning component 450, it can jointly avoid slippage or loss of rotation under yaw conditions.

[0051] like Figures 5 to 11As shown, in a preferred embodiment of the present invention, the counterweight correction assembly 520 includes a counterweight column 521, a counterweight base 522, a counterweight block 523, an upper magnetic chuck 524, and a lower magnetic chuck 525. The counterweight block 523 is radially slidably installed inside the guide cylinder 510. The counterweight base 522 is fixed to the extended end of the counterweight block 523. The counterweight block 523 is mounted on the outer end face of the counterweight base 522. The inner end of the counterweight column 521... The outer wall is connected to the corresponding centering clamping assembly 530. The bottom of the counterweight seat 522 is symmetrically equipped with an upper magnetic suction member 524. Two bosses 310 are symmetrically arranged on the outer end face of the annular sleeve 300 along the axis of the guide cylinder 510. The bosses 310 are integrally formed with the annular sleeve 300. The top surface of the bosses 310 is symmetrically fixed with a lower magnetic suction member 525. The upper magnetic suction member 524 and the lower magnetic suction member 525 are arranged with opposite poles.

[0052] Specifically, when the production line stops and the annular sleeve 300 stops rotating, the centrifugal force completely disappears. The opposing magnetic attraction force between the upper magnetic 524 and the lower magnetic 525 drives the counterweight column 521 to slide inward along the guide cylinder 510, simultaneously pulling the centering clamping assembly 530 outward to facilitate threading the cable core 600 or replacing the reel, until the upper magnetic 524 and the lower magnetic 525 are at a safe working gap; when the annular sleeve 300 revolves at a constant speed... The counterweight 523 and the counterweight seat 522 move in a circular motion synchronously with the sleeve. The centrifugal force generated overcomes the attraction force between the upper magnetic suction component 524 and the lower magnetic suction component 525, and drives the counterweight column 521 to slide outward along the guide cylinder 510. This drives the centering clamping assembly 530 to retract towards the center until all clamping ends are evenly abutted against the outer wall of the cable core 600, and constrains the cable core 600 at the central axis position, thereby completing the initial dynamic centering of the cable core 600.

[0053] When the cable core 600 experiences unilateral radial offset, the offset cable core 600 will push the centering clamping assembly 530 and the counterweight column 521 to offset outward synchronously. The actual rotation radius of the counterweight block 523 on that side will increase accordingly, the centrifugal force will increase synchronously, the proportion of magnetic attraction force will decrease accordingly, and the clamping force on the corresponding side will increase. The rotation radius of the counterweight block 523 on the opposite side will decrease, the centrifugal force will decrease, the proportion of magnetic attraction force will increase, and the clamping force will decrease accordingly. This will create a stable asymmetric differential clamping force on both sides, and the resultant force will always point towards the central axis of the annular sleeve 300, forming a continuous reverse correction thrust, and pushing the cable core 600 to gradually move back to the axial position, thereby completing the dynamic adaptive centering correction of the cable core 600.

[0054] It should be noted that: both the upper magnetic absorbing member 524 and the lower magnetic absorbing member 525 are preferably made of permanent magnets with high magnetic performance, and the end faces of the upper magnetic absorbing member 524 and the lower magnetic absorbing member 525 that are close to each other have opposite magnetic properties and always generate an inward attraction force, providing a non-contact reset force for the counterweight column 521; and the boss 310 is integrally formed with the annular sleeve 300, and the weight of the counterweight block 523 can be selected independently according to actual needs, that is, different weights of counterweight blocks 523 can be selected according to the actual centering force requirements. 23. The clamping force in the balanced state can be directly adjusted to adapt to the production needs of different linear speeds and wire diameters; a limiting platform 540 is fixed on the outer wall of the counterweight column 521. The limiting platform 540 intermittently abuts against the outer end face of the guide cylinder 510. The limiting platform 540 is used to limit the inward movement of the counterweight column 521, ensuring that a suitable adsorption gap is always maintained between the upper magnetic suction member 524 and the lower magnetic suction member 525, avoiding the two from being directly stuck together, and ensuring that the reset force is always within a reasonable working range.

[0055] like Figures 2 to 11 As shown, in a preferred embodiment of the present invention, a rectangular notch 511 is axially provided at one end of the inner side of the guide cylinder 510. Side frames 512 are symmetrically fixed on both sides of the rectangular notch 511. A fixed sliding shaft 513 that slides and cooperates with the centering clamping assembly 530 is provided between the two side frames 512, serving as the swing fulcrum and stroke limiter of the centering clamping assembly 530.

[0056] The centering clamping assembly 530 includes a hinge frame 531, a centering connecting rod 532, a strip groove 533, and a centering clamping plate 534. The hinge frame 531 is fixed on the inner end wall of the counterweight column 521. One end of the centering connecting rod 532 passes through a rectangular notch 511 and is rotatably connected to the hinge frame 531. The centering connecting rod 532 has a strip groove 533 in the middle that slides with the fixed sliding shaft 513. The other end of the centering connecting rod 532 is inclined to the guide cylinder 510 and is fitted with the centering clamping plate 534. The inner end face of the centering clamping plate 534 intermittently abuts against the outer contour of the cable core 600.

[0057] Specifically, when the annular sleeve 300 revolves and causes the counterweight 523 to slide outward under centrifugal force, the counterweight column 521 moves outward synchronously, pulling the hinge frame 531 to move radially outward synchronously. The hinge frame 531 drives the outer end of the centering link 532 to move outward synchronously. Under the fulcrum limit of the fixed sliding shaft 513 and the strip groove 533, the centering link 532 swings slightly around the fixed sliding shaft 513, and the centering clamps 534 on the inner side of the centering link 532 retract towards the axis of the cable core 600 until the inner end faces of all the centering clamps 534 abut against the outer wall of the cable core 600, thus completing the initial centering clamping of the cable core 600. When the cable core 600 experiences unilateral radial displacement, the offset side... The counterweight 523 increases in rotation radius and centrifugal force, which in turn increases the clamping force of the centering plate 534 on that side. The counterweight 523 on the opposite side decreases in rotation radius and centrifugal force, which in turn weakens the clamping force of the corresponding centering plate 534. The clamping forces on both sides form a stable difference, and the resultant force always points to the central axis of the annular sleeve 300, forming a continuous reverse correction thrust, which pushes the cable core 600 to gradually move back to the center position. During this process, the fixed sliding shaft 513 slides relative to the strip groove 533, automatically compensating for the travel difference during the swing of the centering link 532, and there will be no movement jamming. This ensures that the clamping force changes linearly with the centrifugal force, and the correction force is stable and smooth.

[0058] When the cable core 600 joint or local protrusion passes through, the radial impact force is transmitted to the centering connecting rod 532 through the centering clamp 534, which pushes the counterweight block 523 outward to automatically increase the inner diameter of the clamping channel, avoiding rigid jamming that could damage the uncured insulation layer or scratch the surface of the cable core 600; after the joint passes through, the centrifugal force will push the centering clamp 534 to automatically reset, thereby quickly restoring the centering state.

[0059] It should be noted that the inner end face of the centering clamp 534 is set as a concave arc surface that matches the arc-shaped outer contour of the cable core 600, and a number of sliding balls are equidistantly embedded on the inner end face of the centering clamp 534 along the axial direction. When the centering clamp 534 clamps the cable core 600, the sliding balls on its inner end face roll in contact with the outer wall of the cable core 600, which can form a flexible clamping structure without sliding scratches.

[0060] like Figures 1 to 4 As shown, in a preferred embodiment of the present invention, the shaft adjustment mechanism 110 includes a positioning post 111, an adjusting stud 112, and an adjusting nut 113. The positioning post 111 is vertically fixed to the top of the fixed base 100. The adjusting stud 112 is parallel to the positioning post 111 and fixed to the top of the fixed base 100. The adjusting base plate 200 is vertically slidably sleeved on the outside of the positioning post 111 of the adjusting stud 112. The threaded section of the adjusting stud 112 is fitted with the adjusting nut 113. The upper surface of the adjusting nut 113 abuts against the bottom of the adjusting base plate 200.

[0061] Specifically, when installation errors occur during initial installation or long-term operation, rotating the adjusting nut 113 along the adjusting stud 112 causes the adjusting base plate 200 to rise and fall vertically along the positioning column 111, thereby changing the vertical height of the upper annular frame 210 and annular sleeve 300. This quickly adjusts the reference axis of the annular sleeve 300 to coincide with the axis of the mold core and the reference height for laying out the cable core 600, thus completing the coarse alignment of the reference axis and eliminating the misalignment problem caused by equipment installation deviation and foundation settlement. Adjusting the positioning column 111 throughout the entire process constrains the movement direction of the adjusting base plate 200, ensuring the bottom during lifting and lowering. The plate remains level without any deviation or tilt, ensuring that the axis of the annular sleeve 300 is always parallel to the axis of the mold core, preventing issues such as uneven wear of the mechanism or uneven driving force caused by misalignment. After adjustment, the height can be stably maintained by the self-locking performance of the threaded pair, and it will not fall back on its own during operation. When producing cable cores 600 with different wire diameters or specifications, the wire feeding reference height of the cable core 600 will change. The overall height of the base plate 200 can be quickly adjusted by directly rotating the adjusting nut 113 to match the wire feeding reference of the corresponding specification, eliminating the need to repeatedly adjust the height of the wire inlet bracket or wire feeding frame, and greatly improving the efficiency of changeover and debugging.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concentricity adaptive extrusion device for low-smoke halogen-free cables, comprising an extrusion main unit, an inlet support, an extrusion die, a die core, and a die sleeve, characterized in that, A dynamic alignment unit is installed between the feed support and the feed side of the extruder. The dynamic alignment unit consists of a fixed base, a shaft adjustment mechanism, an adjustment base plate, an annular frame, a bearing, an annular sleeve, a friction drive mechanism, and a counterweight correction and alignment clamping mechanism. The fixed base is fixed between the feed support and the feed side of the extruder. The shaft adjustment mechanism is installed on the fixed base. An adjustment base plate is fixed on the adjustment end of the shaft adjustment mechanism. An annular frame is coaxially fixed at both ends of the adjustment base plate. The left and right ends of the annular sleeve are rotatably installed in the two annular frames through bearings. The friction drive mechanism is arranged symmetrically up and down and independently mounted on the outer wall of the left end of the annular sleeve. The two sets of friction drive mechanisms float independently. Each set of friction drive mechanisms includes a fixed sleeve, a slide block, an inclined friction wheel, a wheel axle, an adaptive fine-tuning component, and an elastic pressure component. The two fixed sleeves are arranged symmetrically up and down and radially fixed on the outer wall of the left side of the annular sleeve. A slide block is radially slidably installed inside each of the two fixed sleeves. The inclined friction wheel is inclinedly mounted on the inner side of the slide block through the wheel axle. The axis of the inclined friction wheel forms a constant helical angle with the axis of the cable core. The end faces of the two inclined friction wheels that are close to each other rub against the upper and lower outer contours of the cable core, respectively. The adaptive fine-tuning component and the elastic pressure component are correspondingly matched to each slide block. The adaptive fine-tuning component is connected to the wheel axle, and the elastic pressure component is connected to the outer side of the fixed sleeve. The counterweight correction and centering clamping mechanism is equidistantly distributed along the circumferential axis of the annular sleeve on the outer wall of the right side of the annular sleeve. The counterweight correction and centering clamping mechanism includes a guide cylinder, a counterweight correction assembly, and a centering clamping assembly. The guide cylinder is equidistantly distributed along the circumferential axis of the annular sleeve and radially fixed on the outer wall of the right side of the annular sleeve. The counterweight correction assembly is radially slidably arranged inside the guide cylinder. The centering clamping assembly connected to the counterweight correction assembly is installed on the inner outer wall of the guide cylinder. The counterweight correction assembly generates centrifugal force as the annular sleeve revolves and drives the clamping end of the centering clamping assembly to retract radially.

2. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 1, characterized in that, The two inclined friction wheels are arranged symmetrically at 180° vertically. The spatial helical deflection angle of the inclined friction wheels is 18-28°, and the helical deflection angles of the two inclined friction wheels are in the same direction, and they are superimposed to form a circumferential driving torque in the same direction.

3. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 1, characterized in that, The adaptive fine-tuning component includes a fine-tuning pin, a bracket, and a fine-tuning torsion spring. The bracket is arranged parallel to both sides of the inclined friction wheel along its axial direction. One end of the bracket is fitted with a fine-tuning pin, which is slidably embedded in an arc-shaped groove symmetrically opened on both sides of the slide block. The other end of the bracket is coaxially connected to the wheel axle. The inclined friction wheel is mounted between the two brackets via the wheel axle. One end of the fine-tuning torsion spring is fitted to the extended end of the wheel axle, and the other end of the fine-tuning torsion spring is fitted to the outer wall of the slide block.

4. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 1, characterized in that, The elastic pressure assembly includes a pressure stud, a pressure plate, a pressure spring, and a pressure nut. The pressure stud is parallel to the fixed sleeve and symmetrically fixed on the outer end face of the fixed sleeve. The pressure plate is radially sleeved on the pressure stud. The pressure plate is fixedly connected to the outer end face of the slide. The outer end of the pressure stud is threaded with a pressure nut. The inner end face of the pressure nut abuts against the outer side face of the pressure plate. The outer side of the pressure stud is coaxially sleeved with a pressure spring. The two ends of the pressure spring abut against the inner side face of the pressure plate and the outer end face of the fixed sleeve, respectively.

5. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 1, characterized in that, The counterweight correction assembly includes a counterweight column, a counterweight base, a counterweight block, an upper magnetic chuck, and a lower magnetic chuck. The counterweight block is radially slidably installed inside the guide cylinder. The counterweight base is fixed to the extended end of the counterweight block. The counterweight block is mounted on the outer end face of the counterweight base. The outer wall of one inner end of the counterweight column is connected to the corresponding centering clamping assembly. The upper magnetic chuck is symmetrically installed at the bottom of the counterweight base. Two bosses are symmetrically arranged on the outer end face of the annular sleeve along the axis of the guide cylinder. The bosses are integrally formed with the annular sleeve. The lower magnetic chuck is symmetrically fixed to the top surface of the bosses. The upper and lower magnetic chucks are arranged with opposite poles.

6. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 5, characterized in that, A limiting platform is fixed on the outer wall of the counterweight column. The limiting platform intermittently abuts against the outer end face of the guide cylinder. The limiting platform is used to limit the inward movement of the counterweight column.

7. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 5, characterized in that, A rectangular notch is axially opened at one end of the inner side of the guide cylinder. Side frames are symmetrically fixed on both sides of the rectangular notch. A fixed sliding shaft that slides between the two side frames and is slidably engaged with the centering clamping assembly is provided.

8. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 7, characterized in that, The centering clamping assembly includes a hinge frame, a centering connecting rod, a strip groove, and a centering clamping plate. The hinge frame is fixed to the inner end wall of the counterweight column. One end of the centering connecting rod passes through a rectangular notch and is rotatably connected to the hinge frame. The centering connecting rod has a strip groove in the middle that slides with a fixed sliding shaft. The other end of the centering connecting rod is inclined to the guide cylinder and is fitted with a centering clamping plate. The inner end face of the centering clamping plate intermittently abuts against the outer contour of the cable core.

9. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 8, characterized in that, The inner end face of the centering clamp is configured as a concave arc surface that matches the arc-shaped outer contour of the cable core, and a number of sliding balls are equidistantly embedded on the inner end face of the centering clamp along the axial direction.

10. The low-smoke halogen-free cable concentricity adaptive extrusion device according to claim 1, characterized in that, The shaft adjustment mechanism includes a positioning post, an adjusting stud, and an adjusting nut. The positioning post is vertically fixed to the top of the fixed base. The adjusting stud is parallel to the positioning post and fixed to the top of the fixed base. The adjusting base plate is vertically slidably sleeved on the outside of the positioning post of the adjusting stud. The threaded section of the adjusting stud is fitted with an adjusting nut. The upper surface of the adjusting nut abuts against the bottom of the adjusting base plate.

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