Sheath extruder for cable production

Abstract

The invention discloses a sheath extruder for cable production, and belongs to the technical field of extruders, the sheath extruder comprises a foundation bottom plate, the foundation bottom plate is fixedly connected with an extruder head, one side of the extruder head is communicated with a guide shell, the top of the extruder head is communicated with a plasticized raw material feeding cylinder, and the top of the plasticized raw material feeding cylinder is communicated with a plasticized raw material discharging cylinder. And a spiral blade is rotationally connected into the plasticizing raw material feeding barrel. By arranging the adjusting mechanism, the centrifugal force borne by the sliding block in the control disc is controlled according to the movement speed of the cable core, so that the heating frequency of the arc-shaped electric heating plate is influenced, and then it is guaranteed that the heating frequency can be correspondingly changed according to the actual movement condition of the cable core; and meanwhile, the resistance influence of the corresponding slide rheostat can be directly fed back to the rotating speed of the spiral blade, so that the discharge rate of the molten material can be linearly controlled according to the movement speed of the cable core.

Description

Technical Field

[0001] The present invention belongs to the technical field of extruders, and specifically relates to a sheathing extruder for cable production. Background Art

[0002] A cable sheathing extruder is a key device in wire and cable production. It is mainly used to uniformly coat the outer layer of a conductor or cable core with sheath materials such as plastics and rubbers to provide functions such as insulation, mechanical protection, and environmental protection. With the growth in demand for power transmission, communication, and special cables, sheathing extrusion technology has been continuously upgraded, evolving from simple thermoplastic extrusion in the early days to high-precision extrusion processes that can now adapt to various materials (such as PVC, PE, TPU, etc.). Modern sheathing extruders need to meet requirements such as high-speed and stable production, uniform thickness control, wide material adaptability, while also taking into account energy conservation, high efficiency, and automated control to adapt to different cable standards (such as UL, IEC, etc.) and complex application scenarios (such as high temperature resistance, ultraviolet resistance, flame retardancy, etc.). The progress of this technology has promoted the improvement of cable performance and the optimization of manufacturing efficiency, making it one of the core production equipment in the wire and cable industry.

[0003] The existing technology still has the following deficiencies: Cable sheathing extruders mainly heat thermoplastic materials to convert them into a molten state for extrusion. However, the main problems of existing cable sheathing extruders are poor control of the extrusion speed of the molten material and uneven heating. First, poor control of the extrusion speed will directly extend the production cycle of a single cable, resulting in a decrease in output per unit time and making it difficult to meet the demand for large batch orders. At the same time, poor control of the extrusion speed will also cause the thermoplastic material in the molten state to not quickly form on the surface of the cable core, resulting in the failure of sheath formation.

[0004] In addition, uneven heating will also lead to a decline in the physical properties of the sheath. Insufficient plasticization will cause the material in the low-temperature area not to be completely melted, forming "cold rubber particles" mixed into the melt, resulting in a rough sheath surface and reduced strength. Local overheating and degradation will also cause the material in the high-temperature area to carbonize or decompose, resulting in black spots and scorch marks on the sheath, and a significant deterioration in insulation performance (such as dielectric strength). The difference in melt fluidity caused by uneven temperature will also make the flow rate of one side of the sheath fast (thin) and the other side slow (thick), and the eccentricity may exceed the tolerance (such as >5%), affecting the bending life of the cable. Summary of the Invention

[0005] In order to overcome the above defects, the present invention provides a sheathing extruder for cable production, which solves the problems in the existing technology.

[0006] To achieve the above object, the present invention provides the following technical solution: A sheathing extruder for cable production, comprising:

[0007] The base floor slab, on which an extruder head is fixedly connected. One side of the extruder head is communicated with a guiding outer shell. The top of the extruder head is communicated with a plasticized raw material feeding cylinder. A spiral blade is rotatably connected in the plasticized raw material feeding cylinder. A plurality of arc-shaped electric heating plates are arranged at the bottom of the plasticized raw material feeding cylinder. A feeding port is opened at the top of the plasticized raw material feeding cylinder;

[0008] A combined linkage control mechanism is arranged on the base floor slab, and an adjusting mechanism is arranged in the guiding outer shell;

[0009] The adjusting mechanism includes a micro-control servo motor fixedly connected to one side of the guiding outer shell. A pair of rotating seats are fixedly connected to the guiding outer shell corresponding to one side of the micro-control servo motor. A lead screw is rotatably connected between the two rotating seats. The output end of the micro-control servo motor penetrates through the corresponding rotating seat on one side and is coaxially fixedly connected to the lead screw. A fixed traction wheel is rotatably connected in the guiding outer shell. A nut is threadedly connected to the lead screw. A through groove is opened in the guiding outer shell corresponding to the position of the lead screw. One side of the nut is fixedly connected to a movable traction wheel. The movable traction wheel is located in the guiding outer shell. The movable traction wheel is coaxially fixedly connected to a control disk. Three sliding groove plates are arranged in the control disk. The three sliding groove plates are distributed along the radial direction of the control disk and the included angle between two adjacent sliding grooves is 120 degrees. A sliding rheostat is fixedly connected in the sliding groove plate. An adjusting telescopic rod is fixedly connected to the side wall of the sliding groove plate. The output end of the adjusting telescopic rod is fixedly connected to a slider. The slider is slidably connected in the sliding groove plate. A tension spring is sleeved outside the adjusting telescopic rod. Two ends of the tension spring are respectively abutted against the sliding groove plate and the slider. The slider is fixedly connected to the sliding piece on the sliding rheostat.

[0010] As a further scheme of the present invention: The combined linkage control mechanism includes a first fixing plate fixedly connected to the base floor slab. A driven belt pulley is rotatably connected to the first fixing plate. A driving belt pulley is rotatably connected to the side wall of the guiding outer shell. A first belt is sleeved between the driving belt pulley and the driven belt pulley. The rotating shaft of the driving belt pulley penetrates through the guiding outer shell and is coaxially fixedly connected to the fixed traction wheel.

[0011] As a further scheme of the present invention: The driven belt pulley is coaxially fixedly connected to an adjusting motor. A positioning disk is fixedly connected to the side of the adjusting motor away from the driven belt pulley. Three sliding grooves are opened on the positioning disk. The three sliding grooves are opened along the radial direction of the positioning disk and the included angle between two adjacent sliding grooves is 120 degrees. An adjusting disk is rotatably connected to the center position of the positioning disk. Three arc-shaped grooves are opened on the adjusting disk. The output end of the adjusting motor penetrates through the positioning disk and is rotatably connected thereto. The output end of the adjusting motor is coaxially fixedly connected to the adjusting disk.

[0012] As a further solution of the present invention: a sliding plate is slidably connected in the sliding groove, one end of the sliding plate away from the axis of the positioning disk is fixedly connected with an arm, a limiting button is fixedly connected to the sliding plate, and the limiting button is slidably connected in the arc groove on the corresponding side. One end of each arm away from the slider is fixedly connected with an arc plate.

[0013] As a further solution of the present invention: a second fixing plate is fixedly connected to the base bottom plate, a matching telescopic rod is fixedly connected to the bottom of the second fixing plate, the output end of the matching telescopic rod is rotatably connected with a matching pulley, a return spring is sleeved outside the matching telescopic rod, and two ends of the return spring are respectively abutted against the second fixing plate and the matching telescopic rod.

[0014] As a further solution of the present invention: a third fixing plate is fixedly connected to the base bottom plate, a compound pulley is rotatably connected to the third fixing plate, and a second belt is sleeved between the arc plates, the matching pulley and the compound pulley.

[0015] As a further solution of the present invention: a linkage box is fixedly connected to one side of the plasticizing raw material feeding cylinder, a driving bevel gear and a driven bevel gear are rotatably connected in the linkage box, the driving bevel gear and the driven bevel gear are meshed with each other, a main pulley is coaxially fixedly connected to the driving bevel gear, a third belt is sleeved between the main pulley and the compound pulley, and the driven bevel gear is coaxially fixedly connected to the spiral blade.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] By setting the adjusting mechanism, according to the movement speed of the cable core, the centrifugal force received by the slider in the control disk is controlled, so as to affect the heating frequency of the arc-shaped electric heating plate, and further ensure that the heating frequency can change correspondingly according to the actual movement of the cable core, avoiding the situation of the decline of the physical properties of the sheath caused by uneven heating. At the same time, the influence on the resistance value of the corresponding sliding rheostat can be directly fed back to the rotation speed of the spiral blade, so that the discharge rate of the molten material can be linearly controlled according to the movement speed of the cable core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 is a three-dimensional structural schematic diagram of another angle of the present invention;

[0020] Figure 3 is Figure 2 the enlarged view of part A in

[0021] Figure 4 is a three-dimensional internal structural schematic diagram of the guiding housing of the present invention;

[0022] Figure 5 Schematic diagram of the three-dimensional internal structure of the control panel of the present invention;

[0023] Figure 6 Schematic diagram of the three-dimensional structure of the positioning disk part of the present invention;

[0024] Figure 7 Schematic diagram of the three-dimensional structure of the positioning disk part of the present invention from another angle;

[0025] Figure 8 Schematic diagram of the three-dimensional structure of the skateboard part of the present invention;

[0026] Figure 9 Schematic diagram of the three-dimensional internal structure of the plasticized raw material feeding cylinder of the present invention.

[0027] In the figure: 1 basic bottom plate, 2 extruder head, 3 guide housing, 4 plasticized raw material feeding cylinder, 5 spiral blade, 6 arc-shaped electric heating plate, 7 feed inlet, 8 micro-control servo motor, 9 rotating seat, 10 lead screw, 11 fixed traction wheel, 12 nut, 13 mobile traction wheel, 14 control panel, 15 sliding groove plate, 16 sliding rheostat, 17 adjusting telescopic rod, 18 slider, 19 tension spring, 20 passive belt pulley, 21 active belt pulley, 22 adjusting motor, 23 positioning disk, 24 adjusting disk, 25 skateboard, 26 support arm, 27 arc-shaped plate, 28 matching telescopic rod, 29 matching belt pulley, 30 return spring, 31 compound belt pulley, 32 linkage box, 33 active bevel gear, 34 driven bevel gear, 35 main belt pulley, 36 first fixing plate, 37 second fixing plate, 38 third fixing plate, 39 first belt, 40 second belt, 41 third belt, 42 arc-shaped groove. Detailed implementation manners

[0028] The technical solutions of this patent will be further described in detail below in conjunction with the specific implementation manners.

[0029] As Figures 1-9 shown, the present invention provides a technical solution:

[0030] A sheath extruder for cable production, comprising:

[0031] The base floor 1 is fixedly connected with an extruder head 2. A guiding housing 3 is communicated and arranged on one side of the extruder head 2. A plasticizing raw material feeding cylinder 4 is communicated and arranged on the top of the extruder head 2. A spiral blade 5 is rotatably connected in the plasticizing raw material feeding cylinder 4. A plurality of arc-shaped electric heating plates 6 are arranged at the bottom of the plasticizing raw material feeding cylinder 4. A feeding port 7 is opened at the top of the plasticizing raw material feeding cylinder 4. Thermoplastic material particles can enter the plasticizing raw material feeding cylinder 4 from the feeding port 7. The arc-shaped electric heating plates 6 are used to heat the particles to convert them into a molten state. The spiral blade 5 can guide the material into the extruder head 2. The mold in the extruder head 2 can form the sheath. The cable core enters from one side of the extruder head 2 and is led out from the other side, and then the sheath sleeving can be completed.

[0032] A combined linkage control mechanism is arranged on the base floor 1, and an adjusting mechanism is arranged in the guiding housing 3.

[0033] The adjusting mechanism includes a micro-controlled servo motor 8 fixedly connected to one side of the guiding outer shell 3. On the guiding outer shell 3, a pair of rotating seats 9 are fixedly connected to the corresponding side of the micro-controlled servo motor 8. A lead screw 10 is rotatably connected between the two rotating seats 9. The output end of the micro-controlled servo motor 8 penetrates through the corresponding rotating seat 9 on one side and is coaxially and fixedly connected to the lead screw 10. A fixed traction wheel 11 is rotatably connected inside the guiding outer shell 3. A nut 12 is threadedly connected to the lead screw 10. A through groove is formed in the guiding outer shell 3 corresponding to the position of the lead screw 10. One side of the nut 12 is fixedly connected to a movable traction wheel 13. The movable traction wheel 13 is located inside the guiding outer shell 3. A control disk 14 is coaxially and fixedly connected to the movable traction wheel 13. Three sliding groove plates 15 are arranged inside the control disk 14. The three sliding groove plates 15 are distributed radially along the control disk 14, and the included angle between two adjacent sliding grooves is 120 degrees. A sliding rheostat 16 is fixedly connected inside the sliding groove plate 15. An adjusting telescopic rod 17 is fixedly connected to the side wall of the sliding groove plate 15. The output end of the adjusting telescopic rod 17 is fixedly connected to a slider 18. The slider 18 is slidably connected inside the sliding groove plate 15. An extension spring 19 is sleeved outside the adjusting telescopic rod 17. The two ends of the extension spring 19 are respectively abutted against the sliding groove plate 15 and the slider 18. The slider 18 is fixedly connected to the sliding piece on the sliding rheostat 16. The fixed traction wheel 11 and the movable traction wheel 13 cooperate with each other to clamp the cable core entering the extruder head 2. Since the thicknesses of different types of cables are different, the micro-controlled servo motor 8 can drive the lead screw 10 to rotate to control the position of the nut 12. Since the nut 12 is fixedly connected to the movable traction wheel 13, the position of the movable traction wheel 13 can be naturally adjusted. By controlling the distance between the movable traction wheel 13 and the fixed traction wheel 11, the stable clamping of the cable core by the two can be ensured. When the cable core moves, it can also drive the two to rotate. The control disk 14 coaxially and fixedly connected to the movable traction wheel 13 will rotate along with it. During production, the rotation speed of the control disk 14 has a linear relationship with the movement speed of the cable core. The masses of the three sliders 18 inside the control disk 14 are relatively large. The centrifugal force received by the slider 18 when rotating along with the control disk 14 is affected by the rotation speed of the control disk 14. The higher the rotation speed of the control disk 14, the greater the centrifugal force it receives, and the greater the distance between the slider 18 and the axis of the control disk 14. The influence brought by the displacement of the slider 18 is that the adjusting telescopic rod 17 and the extension spring 19 extend. The movement of the sliding piece on the sliding rheostat 16 naturally also changes its resistance value. It should be explained that two of the three sliding rheostats 16 are respectively electrically connected to the arc-shaped electric heating plate 6 and the adjusting motor 22, and the other sliding rheostat 16 has no actual function. However, in the present invention, in order to ensure that the overall mass distribution of the control disk 14 is relatively uniform, such a setting is made. The change in the resistance value of the sliding rheostat 16 relatively affects the heating frequency of the arc-shaped electric heating plate 6 and the output of the adjusting motor 22.First, the heating frequency of the arc-shaped electric heating plate 6 should increase as the radius of the cable core increases. The impact brought by adjusting the output of the control of the motor 22 will be described in detail later.

[0034] The combined linkage control mechanism includes a first fixed plate 36 fixedly connected to the base floor 1. A driven pulley 20 is rotatably connected to the first fixed plate 36. A driving pulley 21 is rotatably connected to the side wall of the guiding housing 3. A first belt 39 is sleeved between the driving pulley 21 and the driven pulley 20. The rotating shaft of the driving pulley 21 penetrates through the guiding housing 3 and is coaxially and fixedly connected to the fixed traction wheel 11. The driven pulley 20 is coaxially and fixedly connected with an adjusting motor 22. A positioning disc 23 is fixedly connected to the side of the adjusting motor 22 away from the driven pulley 20. Three sliding grooves are formed in the positioning disc 23. The three sliding grooves are radially formed in the positioning disc 23 and the included angle between two adjacent sliding grooves is 120 degrees. An adjusting disc 24 is rotatably connected to the central position of the positioning disc 23. Three arc-shaped grooves 42 are formed in the adjusting disc 24. The output end of the adjusting motor 22 penetrates through the positioning disc 23 and is rotatably connected thereto. The output end of the adjusting motor 22 is coaxially and fixedly connected to the adjusting disc 24. A sliding plate 25 is slidably connected in the sliding groove. One end of the sliding plate 25 away from the axis of the positioning disc 23 is fixedly connected with an arm 26. A limiting button is fixedly connected to the sliding plate 25 and is slidably connected in the corresponding arc-shaped groove 42 on one side. One end of each arm 26 away from the slider 18 is fixedly connected with an arc-shaped plate 27. A second fixed plate 37 is fixedly connected to the base floor 1. A matching telescopic rod 28 is fixedly connected to the bottom of the second fixed plate 37. The output end of the matching telescopic rod 28 is rotatably connected with a matching pulley 29. A return spring 30 is sleeved outside the matching telescopic rod 28. Two ends of the return spring 30 are respectively abutted against the second fixed plate 37 and the matching telescopic rod 28. A third fixed plate 38 is fixedly connected to the base floor 1. A compound pulley 31 is rotatably connected to the third fixed plate 38. A second belt 40 is sleeved between the multiple arc-shaped plates 27, the matching pulley 29 and the compound pulley 31. A linkage box 32 is fixedly connected to one side of the plasticized raw material feeding cylinder 4. A driving bevel gear 33 and a driven bevel gear 34 are rotatably connected in the linkage box 32. The driving bevel gear 33 and the driven bevel gear 34 are meshed with each other. The driving bevel gear 33 is coaxially and fixedly connected with a main pulley 35. A third belt 41 is sleeved between the main pulley 35 and the compound pulley 31. The driven bevel gear 34 is coaxially and fixedly connected with the spiral blade 5. The adjusting motor 22 can drive the adjusting disc 24 to rotate. When relative rotation occurs between the adjusting disc 24 and the positioning disc 23, the arc-shaped grooves 42 on the adjusting disc 24 move accordingly. Since the limiting buttons on the sliding plates 25 are restricted by the arc-shaped plates, at this time, each sliding plate 25 will move synchronously in the sliding groove. Then, the distances between the arms 26 and the arc-shaped plates 27 and the positioning disc 23 will be adjusted synchronously. The multiple arc-shaped plates 27 cooperate with each other to form a "segmented pulley" structure. When the distance between the arc-shaped plate 27 and the positioning disc 23 is adjusted, the rotation speed of the second belt 40 will be affected. When the distance between the arc-shaped plate 27 and the positioning disc 23 increases and the rotation speed of the positioning disc 23 is constant, the rotation speed of the second belt 40 will increase, and the transmission efficiency is improved. The settings of the driving pulley 21 and the driven pulley 20,The power of the fixed traction wheel 11 can be transmitted to the positioning disk 23. Meanwhile, it should be noted that, in cooperation with the telescopic rod 28 and the return spring 30, the second belt 40 can always be kept in a taut state, without affecting the transmission efficiency. The second belt 40 can drive the compound pulley 31 to rotate. The compound pulley 31 can drive the main pulley 35 to rotate through the third belt 41. Then, the driving bevel gear 33 fixedly connected coaxially with the main pulley 35 can rotate, and the driven bevel gear 34 meshing with the driving bevel gear 33 can rotate, so as to provide power for the spiral blade 5 in the plasticizing material feeding cylinder 4. Meanwhile, the influence of the resistance value of the corresponding sliding rheostat 16 can be directly fed back to the rotation speed of the spiral blade 5. In this way, the discharge rate of the molten material can be linearly controlled according to the movement speed of the cable core.,

[0035] The working principle of the present invention is as follows:

[0036] The thermoplastic material particles can enter the plasticizing material feeding cylinder 4 from the feeding port 7 and are heated by the arc-shaped electric heating plate 6 to be converted into a molten state. The material can be introduced into the extruder head 2 through the spiral blade 5. The die in the extruder head 2 can form the sheath. The cable core enters from one side of the extruder head 2 and is led out from the other side, and thus the sheath sleeving can be completed;

[0037] The fixed traction wheel 11 and the movable traction wheel 13 cooperate with each other to clamp the cable core entering the head 2 of the extruder. Since the thicknesses of different types of cables are different, the micro-controlled servo motor 8 can drive the lead screw 10 to rotate to control the position of the nut 12. Since the nut 12 is fixedly connected to the movable traction wheel 13, the position of the movable traction wheel 13 can naturally be adjusted. By controlling the distance between the movable traction wheel 13 and the fixed traction wheel 11, the stable clamping of the cable core by the two can be ensured. When the cable core moves, it can also drive the two to rotate. The control panel 14 fixedly connected coaxially with the movable traction wheel 13 will rotate with it. During production, the rotation speed of the control panel 14 has a linear relationship with the movement speed of the cable core. The masses of the three sliders 18 in the control panel 14 are relatively large. The centrifugal force received by the sliders 18 when rotating with the control panel 14 is affected by the rotation speed of the control panel 14. The higher the rotation speed of the control panel 14, the greater the centrifugal force it receives, and the greater the distance between the sliders 18 and the axis of the control panel 14. The influence brought by the displacement of the sliders 18 is to extend the adjusting telescopic rod 17 and the tension spring 19, and the movement of the sliding block on the rheostat 16 naturally also changes its resistance value. It should be explained that two of the three rheostats 16 are electrically connected to the arc-shaped electric heating plate 6 and the adjusting motor 22 respectively, and the other rheostat 16 has no actual function. However, in the present invention, in order to ensure that the overall mass distribution of the control panel 14 is relatively uniform, such a setting is made. The change in the resistance value of the rheostat 16 relatively affects the heating frequency of the arc-shaped electric heating plate 6 and the output of the adjusting motor 22. First, the heating frequency of the arc-shaped electric heating plate 6 should increase with the increase of the radius of the cable core, and the influence brought by the control of the output of the adjusting motor 22 will be described in detail later;

[0038] The adjusting motor 22 can drive the adjusting disc 24 to rotate. After relative rotation occurs between the adjusting disc 24 and the positioning disc 23, the arc-shaped groove 42 on the adjusting disc 24 moves accordingly. Since the limit buttons on the sliding plates 25 are restricted by the arc-shaped plates, at this time, each sliding plate 25 will move synchronously in the sliding groove. Then, the distances between the support arms 26 and the arc-shaped plates 27 and the positioning disc 23 will be adjusted synchronously. Multiple arc-shaped plates 27 cooperate with each other to form a "segmented pulley" structure. When the distance between the arc-shaped plate 27 and the positioning disc 23 is adjusted, the rotation speed of the second belt 40 will be affected. When the distance between the arc-shaped plate 27 and the positioning disc 23 increases and the rotation speed of the positioning disc 23 is constant, the rotation speed of the second belt 40 will increase, and the transmission efficiency will be improved. The setting of the driving pulley 21 and the driven pulley 20 can transmit the power of the fixed traction wheel 11 to the positioning disc 23. At the same time, it should be noted that with the setting of the telescopic rod 28 and the return spring 30, the second belt 40 can always be in a taut state without affecting the transmission efficiency. The second belt 40 can drive the compound pulley 31 to rotate. The compound pulley 31 can cause the main pulley 35 to rotate through the third belt 41. Then, the driving bevel gear 33 fixedly connected coaxially with the main pulley 35 can rotate, and the driven bevel gear 34 meshing with the driving bevel gear 33 can rotate, which can provide power for the spiral blade 5 in the plasticizing raw material feeding cylinder 4. At the same time, the influence of the resistance value of the corresponding sliding rheostat 16 can be directly fed back to the rotation speed of the spiral blade 5. In this way, the discharge rate of the molten material can be linearly controlled according to the movement speed of the cable core.

[0039] The above has described the preferred embodiments of the present invention in detail, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A sheath extruder for cable production, characterized in that: include: A base bottom plate (1), an extruder head (2) is fixedly connected to the base bottom plate (1), a guide housing (3) is connected to one side of the extruder head (2), a plasticized raw material feed barrel (4) is connected to the top of the extruder head (2), a spiral blade (5) is rotatably connected inside the plasticized raw material feed barrel (4), a plurality of arc-shaped electric heating plates (6) are arranged at the bottom of the plasticized raw material feed barrel (4), and a feed port (7) is opened at the top of the plasticized raw material feed barrel (4); A combined linkage control mechanism is provided on the base bottom plate (1), and an adjustment mechanism is provided in the guide housing (3); The adjustment mechanism comprises a micro-controlled servo motor (8) fixedly connected to one side of the guide housing (3); a pair of rotating seats (9) are fixedly connected to one side of the guide housing (3) corresponding to the micro-controlled servo motor (8); a screw rod (10) is rotatably connected between the two rotating seats (9); an output end of the micro-controlled servo motor (8) passes through the rotating seat (9) on the corresponding side and is coaxially fixedly connected to the screw rod (10); a fixed traction wheel (11) is rotatably connected inside the guide housing (3); a nut (12) is threadedly connected to the screw rod (10); a through groove is provided in the guide housing (3) at a position corresponding to the screw rod (10); a mobile traction wheel (13) is fixedly connected to one side of the nut (12); the mobile traction wheel (13) is located inside the guide housing (3); the mobile traction wheel (13) is coaxially connected to the guide housing (3); A control disk (14) is fixedly connected to the shaft, and three sliding slots (15) are arranged in the control disk (14). The three sliding slots (15) are distributed radially along the control disk (14) and the angle between two adjacent sliding slots is 120 degrees. A sliding rheostat (16) is fixedly connected in the sliding slot (15). An adjusting telescopic rod (17) is fixedly connected to the side wall of the sliding slot (15). A slider (18) is fixedly connected to the output end of the adjusting telescopic rod (17). The slider (18) is slidably connected in the sliding slot (15). A tension spring (19) is sleeved on the outside of the adjusting telescopic rod (17). The two ends of the tension spring (19) are respectively against the sliding slot (15) and the slider (18). The slider (18) is fixedly connected to the sliding sheet on the sliding rheostat (16).

2. A sheath extruder for cable production according to claim 1, characterized in that: The combined linkage control mechanism comprises a first fixed plate (36) fixedly connected to the base bottom plate (1), a passive pulley (20) being rotatably connected to the first fixed plate (36), a driving pulley (21) being rotatably connected to the side wall of the guide housing (3), a first belt (39) being sleeved between the driving pulley (21) and the passive pulley (20), and a rotating shaft of the driving pulley (21) passing through the guide housing (3) and being coaxially fixedly connected to the fixed traction wheel (11).

3. A sheath extruder for cable production according to claim 2, characterized in that: The passive pulley (20) is coaxially fixedly connected with an adjusting motor (22); the adjusting motor (22) is fixedly connected with a positioning disk (23) on a side away from the passive pulley (20); three slide grooves are provided on the positioning disk (23); the three slide grooves are radially provided along the positioning disk (23) and the angle between two adjacent slide grooves is 120 degrees; the positioning disk (23) is rotatably connected with an adjusting disk (24) at an axial position; three arc grooves (42) are provided on the adjusting disk (24); the output end of the adjusting motor (22) passes through the positioning disk (23) and is rotatably connected thereto; the output end of the adjusting motor (22) is coaxially fixedly connected with the adjusting disk (24).

4. A sheath extruder for cable production according to claim 3, characterized in that: A slide plate (25) is slidably connected in the slide groove, and an end of the slide plate (25) away from the axis of the positioning plate (23) is fixedly connected to a support arm (26). A limit button is fixedly connected to the slide plate (25), and the limit button is slidably connected to the arc groove (42) on the corresponding side. An end of each support arm (26) away from the slider (18) is fixedly connected to an arc plate (27).

5. A sheath extruder for cable production according to claim 4, characterized in that: A second fixing plate (37) is fixedly connected to the base bottom plate (1); a matching telescopic rod (28) is fixedly connected to the bottom of the second fixing plate (37); an output end of the matching telescopic rod (28) is rotatably connected to a matching pulley (29); a return spring (30) is sleeved on the outside of the matching telescopic rod (28); two ends of the return spring (30) are respectively against the second fixing plate (37) and the matching telescopic rod (28).

6. A sheath extruder for cable production according to claim 5, characterized in that: A third fixed plate (38) is fixedly connected to the base bottom plate (1), a composite pulley (31) is rotatably connected to the third fixed plate (38), and a second belt (40) is sleeved between the plurality of arc-shaped plates (27), the matching pulley (29) and the composite pulley (31).

7. A sheath extruder for cable production according to claim 6, characterized in that: A linkage box (32) is fixedly connected to one side of the plasticized raw material feeding barrel (4), and a driving bevel gear (33) and a driven bevel gear (34) are rotatably connected inside the linkage box (32). The driving bevel gear (33) and the driven bevel gear (34) are meshed with each other. The driving bevel gear (33) is coaxially fixedly connected to a main belt pulley (35), and a third belt (41) is sleeved between the main belt pulley (35) and the composite belt pulley (31). The driven bevel gear (34) is coaxially fixedly connected to the spiral blade (5).

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