Insulating layer coating machine for plastic insulated control cable production

Abstract

The application relates to the technical field of insulation cable coating, in particular to an insulation layer coating machine for plastic insulation control cable production, the outer edge of an adjusting ring groove is provided with a pressure adjusting assembly composed of elastically thin plates and arc plates which are distributed at intervals in the circumference, the elastically thin plates are attached to the circular arc side walls of an extrusion ring plate, the arc plates are pressed on the insulation molten raw materials filled in the inner cavity of the adjusting ring groove, and adjusting screws are arranged on the circular arc side walls of the extrusion ring plate and abut against the arc plates, beneficial effects are that: the volume of the adjusting ring groove filled with the insulation raw materials can be adjusted through the pressure adjusting assembly composed of the elastically thin plates and the arc plates, the extrusion pressure at the circular position can be appropriately adjusted through the action of the adjusting screws on the arc plates aiming at the difference in the coating thickness caused by the different pressures at the circular angle, the pressure difference caused by the poor flowability is compensated, the forming precision is further improved, and the design requirement for the thickness of the insulation cable caused by the production process limitation is reduced.

Description

Technical Field

[0001] This invention relates to the field of insulated cable coating technology, specifically to an insulation layer coating machine for the production of plastic insulated control cables. Background Technology

[0002] During the production process of plastic insulated control cables, an insulating plastic layer needs to be wrapped around the outside of the bare cable. This usually requires heating and melting plastic granules, then fully mixing them through a screw extruder before extruding. The molten material is then extruded in a tubular shape through a ring-shaped die and wrapped around the bare cable. After the wrapping is completed, the insulation layer is cooled and cured by water cooling.

[0003] However, in actual production, due to the extremely poor fluidity of the molten insulating plastic raw material, the pressure difference during the annular extrusion process from the extrusion equipment to the ring extrusion is significant. This results in a non-circular coating effect, leading to substantial differences in the thickness of the insulation layer of the molded plastic insulated control cable around its circumference. This is because the transformation from a columnar or strip shape to a tubular shape relies heavily on extrusion pressure and the material's own fluidity. Poor fluidity causes uneven pressure distribution during deformation, affecting subsequent molding quality. Furthermore, the poor fluidity also contributes to inconsistent extrusion pressure during the ring extrusion process. Conventional solutions often involve increasing the insulation layer thickness, i.e., increasing the annular width of the extrusion ring to compensate for the circumferential thickness difference caused by insufficient pressure, ensuring adequate insulation protection for the bare cable. While this approach guarantees the cable's insulation performance, it wastes resources and results in generally larger outer diameters and heavier weights for the molded insulated cables. Summary of the Invention

[0004] The purpose of this invention is to provide an insulation coating machine for the production of plastic insulated control cables, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An insulation coating machine for producing plastic insulated control cables is disclosed. The coating machine includes a coating tube and an extrusion feeding assembly. The coating tube is connected to the extrusion feeding assembly, and a bare cable with continuous wiring runs through the middle of the coating tube and the extrusion feeding assembly. The extrusion feeding assembly includes a coaxially sleeved outer feeding tube and an inner feeding tube. The annular inner cavity formed by the outer feeding tube and the inner feeding tube is set as the inner feeding cavity. The upper end of the inner feeding cavity is provided with a feed port that connects to the discharge end of the screw extruder. A spiral annular tube driven by a motor and pushing the insulating molten raw material input from the screw extruder into the coating tube is provided in the inner feeding cavity. One end of the coating tube is provided with an extrusion ring plate communicating with the inner cavity of the feed. The other end of the coating tube is provided with a cooling component for cooling and curing the insulation layer after the bare cable is coated and formed. The middle of the extrusion ring plate is provided with a limiting inner ring adapted to the outer diameter of the bare cable. The inner cavity of the circular ring formed by the extrusion ring plate and the limiting inner ring is set as an adjusting ring groove. One side of the adjusting ring groove is communicating with the inner cavity of the feed. The other side of the adjusting ring groove is provided with a discharge ring port communicating with the coating tube. The outer edge of the adjusting ring groove is provided with a pressure regulating component composed of elastic thin plates and arc plates distributed circumferentially. The elastic thin plates are attached to the arc sidewall of the extrusion ring plate. The arc plates are pressed against the insulating molten raw material filled in the inner cavity of the adjusting ring groove. An adjusting screw is provided on the arc sidewall of the extrusion ring plate and is threaded and abuts against the arc plate.

[0006] Preferably, the cooling assembly includes a water cooling device and an air cooling device. The air cooling device is located on the side near the extrusion ring plate and includes an air inlet located at the lower end of the coating tube and having a built-in filter, and an exhaust fan located above the coating tube and directly opposite the air inlet.

[0007] Preferably, the water cooling device includes a dripping device and a draining component. The dripping device has multiple sets of vertically parallel diversion pipes built in, with the lower end of the pipes facing the insulation layer of the bare cable after it has been wrapped. The draining component is located directly below the dripping device, and the inner cavity of the draining component is set in a cone shape, with the width of the upper cone opening of the inner cavity being greater than the water outlet width at the lower end of the dripping device.

[0008] Preferably, a support frame is provided on one side of the extrusion feeding assembly, one end of the outer feeding tube is fixed on the support frame, and the other end of the outer feeding tube is provided with a sealing ring cover on one side of the sealing adjustment ring groove. The sealing ring cover is fixedly connected to the extrusion ring plate, one end of the inner feeding tube is fixed on the support frame, and the other end of the inner feeding tube is fixedly connected to the limiting inner ring.

[0009] Preferably, the upright is provided with a motor-driven drive gear, the spiral annular tube includes a spiral section and a turntable, the spiral section is located in the inner feed cavity, the turntable fits the ends of the outer feed tube and the inner feed tube, a stepped annular shaft is provided on the outer side of the turntable extending along the annular groove gap between the ends of the outer feed tube and the inner feed tube, the stepped annular shaft passes through the upright, and the middle section of the stepped annular shaft is rotatably connected to the upright via a bearing, the end of the stepped annular shaft is provided with a toothed ring, and the toothed ring is meshed with the drive gear.

[0010] Preferably, the annular groove gap formed at one end of the coaxial connection between the outer feed tube and the inner feed tube accommodates the stepped ring shaft to rotate and extend through. The annular groove gap formed at the other end of the outer feed tube and the inner feed tube is set as an extrusion port, which is used to connect the inner feed cavity and the adjusting annular groove.

[0011] Preferably, the outer arc wall of the extrusion ring plate is provided with multiple sets of screw holes arranged in a circumferential array, and the multiple sets of screw holes correspond one-to-one with the arc plate. An adjusting screw is rotatably installed in the screw hole through the internal thread, and the other end of the adjusting screw is rotatably installed on the outer arc wall of the arc plate through a bearing.

[0012] Preferably, the adjusting ring groove is provided with a limiting stop ring to restrict the movement distance of the arc plate towards the discharge ring, the arc plate is fixedly connected to the elastic thin plate, and the adjusting ring groove is provided with a guide post to facilitate the smooth bending of the elastic thin plate towards the arc plate.

[0013] Preferably, a plurality of detection tubes arranged in a circumferential array are inserted into one side of the adjusting ring groove. The detection tubes are connected to the inner cavity of the adjusting ring groove, and a piston scale rod is elastically installed inside the detection tubes. The inner ports of the plurality of detection tubes arranged in a circumferential array correspond one-to-one with the circumferentially spaced arc plates.

[0014] Preferably, the outer port of the detection tube is provided with an end cap, and the piston scale rod includes a piston that slides along the inner wall of the detection tube and a scale rod that slides through the end cap and extends to the outer side of the detection tube. A spring is sleeved on the outer wall of the scale rod, and the spring is located inside the detection tube and is pressed between the piston and the end cap.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a spiral tube to extrude molten raw materials in a spiral shape before extrusion, which fully plasticizes the raw materials into a spiral shape before extrusion, thus solving the problem of insufficient deformation and facilitating subsequent cable wrapping. By setting up a pressure regulating component consisting of an elastic thin plate and an arc plate, the volume of the adjusting ring groove for filling the insulating material is adjustable. To address the difference in coating thickness caused by different pressures at different circumferential angles, the extrusion pressure at that circumferential position can be appropriately adjusted by adjusting the action of the screw on the arc plate. This compensates for the pressure difference caused by poor fluidity, further improves the molding accuracy, and reduces the design requirements for the thickness of the insulated cable due to production process limitations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the coated tube structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the limiting inner ring of the present invention installed inside the extrusion ring plate; Figure 3 This is a schematic diagram of the coating structure of the present invention; Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a three-dimensional structural diagram of the voltage regulating component of the present invention; Figure 6This is a schematic diagram of the three-dimensional structure of the coated tube of the present invention; Figure 7 This is a side view of the voltage regulating component of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the spiral ring tube of the present invention.

[0017] In the diagram: 1. Sheathing tube; 2. Bare cable; 3. Insulation layer; 4. Drip device; 5. Exhaust fan; 6. Drainage component; 7. Air inlet; 8. Limiting inner ring; 9. Extrusion ring plate; 10. Feeding outer tube; 11. Feed inlet; 12. Spiral ring tube; 13. Gear ring; 14. Drive gear; 15. Bearing; 16. Stand; 17. Feeding inner tube; 18. Feeding inner cavity; 19. Sealing ring cover; 20. Adjusting screw; 21. Piston scale rod; 22. Spring; 23. Detection tube; 24. Adjusting ring groove; 25. Discharge ring port; 26. Screw hole; 27. Arc plate; 28. Extrusion port; 29. ​​Elastic thin plate; 30. Guide column; 31. Limiting retaining ring; 32. Stepped ring shaft. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 8 The present invention provides a technical solution: Example 1: An insulation coating machine for producing plastic insulated control cables. The coating machine includes a coating tube 1 and an extrusion feeding assembly. The coating tube 1 is connected to the extrusion feeding assembly, and a bare cable 2 with continuous wiring runs through the middle of the coating tube 1 and the extrusion feeding assembly. The extrusion feeding assembly includes a coaxially sleeved outer feeding tube 10 and an inner feeding tube 17. The annular inner cavity formed by the outer feeding tube 10 and the inner feeding tube 17 is set as the inner feeding cavity 18. The upper end of the inner feeding cavity 18 is provided with a feed port 11 that connects to the discharge end of the screw extruder. The inner feeding cavity 18 is provided with a spiral annular tube 12 that is driven by a motor and pushes the insulating molten raw material input from the screw extruder into the coating tube 1.

[0020] The feed inlet 11 receives the molten insulating plastic raw material extruded by the screw extruder. The spiral ring tube 12 re-extrudes and pushes the incoming raw material, forming a ring shape in the feed cavity 18, which facilitates the subsequent wrapping of the bare cable 2. The spiral propulsion and plasticity of the spiral ring tube 12 solve the molding error caused by the flow problem in the plastic stage of the raw material.

[0021] One end of the coating tube 1 is provided with an extrusion ring plate 9 that communicates with the feed cavity 18, and the other end of the coating tube 1 is provided with a cooling component for cooling and curing the insulation layer 3 after the bare cable 2 is coated and formed. The middle of the extrusion ring plate 9 is provided with a limiting inner ring 8 that matches the outer diameter of the bare cable 2. The annular cavity formed by the extrusion ring plate 9 and the limiting inner ring 8 is set as an adjusting ring groove 24. One side of the adjusting ring groove 24 communicates with the feed cavity 18, and the other side of the adjusting ring groove 24 is provided with a discharge ring port 25 that communicates with the coating tube 1.

[0022] The extrusion ring plate 9 and the limiting inner ring 8 form an annular adjustment groove 24, which receives the plasticized raw material. The discharge ring 25 forms an annular tube extrusion and circumferentially wraps the bare cable 2. The limiting inner ring 8 limits the position of the bare cable 2 to ensure the positional accuracy during wrapping.

[0023] The outer edge of the adjusting ring groove 24 is provided with a pressure regulating assembly consisting of elastic thin plates 29 and arc plates 27 distributed circumferentially. The elastic thin plates 29 are attached to the arc sidewall of the extrusion ring plate 9, and the arc plates 27 are pressed against the insulating molten raw material filling the inner cavity of the adjusting ring groove 24. An adjusting screw 20 is provided on the arc sidewall of the extrusion ring plate 9 and abuts against the arc plate 27.

[0024] By setting up a pressure regulating assembly consisting of an elastic thin plate 29 and an arc plate 27, the volume of the plastic raw material wrapped in the regulating ring groove 24 can be adjusted. The position of the arc plate 27 can be adjusted by using the circumferentially distributed regulating screws 20, so as to accurately control the pressure difference on the circumferential angle and ensure that the thickness of the insulating layer 3 on the circumferential angle is uniform after molding.

[0025] Working principle: First, the limiting inner ring 8 is used to ensure that the bare cable 2 is limited to pass through the covering tube 1 and the extrusion feeding assembly. Then, the spiral propulsion and plasticity of the spiral ring tube 12 are used to solve the molding error caused by the flow problem in the raw material plasticity stage, and ensure that the plastic raw material enters the adjustment ring groove 24 at the end of the covering tube 1 in a dense and uniform ring shape.

[0026] The raw material is filled into the adjusting ring groove 24 and extruded along the discharge ring 25, thereby covering the bare cable 2 that passes through the covering tube 1. The volume of the plastic raw material wrapped in the adjusting ring groove 24 is adjustable by using the pressure regulating assembly composed of the elastic thin plate 29 and the arc plate 27. The position of the arc plate 27 is adjusted by using the adjusting screws 20 distributed in a circumferential array, so as to accurately control the pressure difference in the circumferential angle and ensure that the thickness of the insulation layer 3 after molding is uniform in the circumferential angle.

[0027] The formed insulation layer 3 is transported along the covering tube 1 and cooled and fixed by the cooling component.

[0028] Example 2: Based on Example 1, in order to achieve sufficient cooling of the insulation layer 3 and avoid deformation of the insulation layer 3 during the cooling process, the cooling assembly includes a water cooling device and an air cooling device. The air cooling device is located on the side near the extrusion ring plate 9, and the air cooling device includes an air inlet 7 located at the lower end of the coating tube 1 and having a built-in filter, and an exhaust fan 5 located above the coating tube 1 and facing the air inlet 7.

[0029] Pre-cooling with air achieves rapid cooling and fixation of the outer layer of insulation layer 3, avoiding deformation of the outer wall of insulation layer 3 during subsequent drip cooling.

[0030] The water cooling device includes a drip device 4 and a drain component 6. The drip device 4 has multiple sets of vertical parallel diversion pipes built in, with the lower end of the pipes facing the bare cable 2 after the insulation layer 3 is formed. The drain component 6 is located directly below the drip device 4. The inner cavity of the drain component 6 is set as a cone, and the width of the cone opening at the upper end of the inner cavity is greater than the water outlet width at the lower end of the drip device 4.

[0031] By setting up a dripping device 4, continuous dripping cooling of the insulation layer 3 is achieved, avoiding excessive water flow that could impact the outer wall of the insulation layer 3.

[0032] Example 3: Based on Example 1, in order to achieve the limiting installation of the coating tube 1 and the extrusion feeding assembly, a stand 16 is provided on one side of the extrusion feeding assembly. One end of the outer feeding tube 10 is fixed on the stand 16, and the other end of the outer feeding tube 10 is provided with a sealing ring cover 19 on one side of the sealing adjustment ring groove 24. The sealing ring cover 19 is fixedly connected to the extrusion ring plate 9. One end of the inner feeding tube 17 is fixed on the stand 16, and the other end of the inner feeding tube 17 is fixedly connected to the limiting inner ring 8. The annular groove gap formed at one end after the outer feeding tube 10 and the inner feeding tube 17 are coaxially sleeved to accommodate the stepped ring shaft 32 to rotate through and extend. The annular groove gap formed at the other end of the outer feeding tube 10 and the inner feeding tube 17 is set as the extrusion port 28. The extrusion port 28 is used to connect the inner feeding cavity 18 and the adjustment ring groove 24.

[0033] The support frame 16 is used to limit and fix the extrusion feeding assembly consisting of the outer feed tube 10 and the inner feed tube 17, and at the same time, to fix the covering tube 1 and the limiting inner ring 8.

[0034] The upright frame 16 is equipped with a motor-driven drive gear 14. The spiral ring tube 12 includes a spiral section and a turntable. The spiral section is located in the feed inner cavity 18. The turntable fits the ends of the feed outer tube 10 and the feed inner tube 17. A stepped ring shaft 32 is provided on the outer side of the turntable, extending along the annular groove gap between the ends of the feed outer tube 10 and the feed inner tube 17. The stepped ring shaft 32 passes through the upright frame 16, and the middle section of the stepped ring shaft 32 is rotatably connected to the upright frame 16 through a bearing 15. A toothed ring 13 is provided at the end of the stepped ring shaft 32, and the toothed ring 13 is meshed with the drive gear 14.

[0035] The stand 16 and the stepped ring shaft 32 work together to achieve the rotational installation of one end of the spiral ring tube 12, which in turn engages with the drive gear 14 driven by the motor and the gear ring 13 to achieve continuous rotational drive of the spiral ring tube 12.

[0036] Example 4: Based on Example 3, in order to facilitate the detection and adjustment of pressure differences on the circumferential angle of the adjusting ring groove 24, multiple sets of screw holes 26 are arranged in a circumferential array on the outer arc wall of the extrusion ring plate 9. The multiple sets of screw holes 26 correspond one-to-one with the arc plate 27. The adjusting screw 20 is rotatably inserted into the internal thread of the screw hole 26. The other end of the adjusting screw 20 is rotatably mounted on the outer arc wall of the arc plate 27.

[0037] The relative position of the arc plate 27 is adjusted by rotating the adjusting screw 20 through the screw hole 26.

[0038] The adjusting ring groove 24 is provided with a limiting ring 31 to restrict the movement distance of the arc plate 27 toward the discharge ring 25. The arc plate 27 is fixedly connected to the elastic thin plate 29. The adjusting ring groove 24 is provided with a guide post 30 to facilitate the smooth bending of the elastic thin plate 29 toward the arc plate 27.

[0039] By using guide posts 30 to limit the position of the elastic thin plate 29, the adjustment of the multiple sets of arc plates 27 distributed in a circular array becomes relatively independent, reducing the amplitude of mutual interference.

[0040] A plurality of detection tubes 23 arranged in a circumferential array are inserted into one side of the adjusting ring groove 24. The detection tubes 23 are connected to the inner cavity of the adjusting ring groove 24, and a piston scale rod 21 is elastically installed inside the detection tube 23. The inner ports of the plurality of detection tubes 23 arranged in a circumferential array correspond one-to-one with the circumferentially spaced arc plates 27. An end cap is provided at the outer port of the detection tube 23. The piston scale rod 21 includes a piston that slides along the inner wall of the detection tube 23 and a scale rod that slides through the end cap and extends to the outer side of the detection tube 23. A spring 22 is sleeved on the outer wall of the scale rod. The spring 22 is located inside the detection tube 23 and is pressed between the piston and the end cap.

[0041] By cooperating with the detection tube 23 and the piston scale rod 21, the pressure difference on the circumferential angle of the regulating ring groove 24 can be clearly reflected. The pressure magnitude at that angle position can be determined based on the change in the extension length on the piston scale rod 21.

[0042] The adjustment process is as follows: Initially, the extension length of the piston ruler rod 21 is limited. The extension length is determined according to the thickness and outer diameter of the insulating layer 3. When all the piston ruler rods 21 distributed in the circumferential array have extended to the fixed length, it indicates that the internal pressure meets the extrusion pressure, that is, the adjusting ring groove 24 is fully filled. Then, the discharge ring 25 is opened for wrapping and discharge. At this time, the limitation on the extension length of the piston ruler rod 21 is released. As the discharge and wrapping continues for a period of time, due to issues such as fluidity, the extension length of the piston ruler rods 21 distributed in the circumferential array varies. If the length increases compared to the limited length, the internal pressure at that position is high, and the arc plate 27 needs to be moved outward. If the length decreases compared to the limited length, the internal pressure at that position is low, and the arc plate 27 needs to be pushed towards the center.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An insulation coating machine for producing plastic-insulated control cables, the coating machine comprising a coating tube (1) and an extrusion feeding assembly, the coating tube (1) being connected to the extrusion feeding assembly, and a bare cable (2) with continuous wiring passing through the middle of the coating tube (1) and the extrusion feeding assembly, characterized in that: The extrusion feeding assembly includes a coaxially sleeved outer feeding tube (10) and an inner feeding tube (17). The annular inner cavity formed by the outer feeding tube (10) and the inner feeding tube (17) is set as the inner feeding cavity (18). The upper end of the inner feeding cavity (18) is provided with a feed port (11) that connects to the discharge end of the screw extruder. The inner feeding cavity (18) is provided with a spiral annular tube (12) that is driven by a motor and pushes the insulating molten raw material input from the screw extruder into the coating tube (1). One end of the covering tube (1) is provided with an extrusion ring plate (9) communicating with the feed cavity (18), and the other end of the covering tube (1) is provided with a cooling component for cooling and curing the insulation layer (3) after the bare cable (2) is covered and formed. The middle of the extrusion ring plate (9) is provided with a limiting inner ring (8) adapted to the outer diameter of the bare cable (2). The annular cavity formed by the extrusion ring plate (9) and the limiting inner ring (8) is set as an adjusting ring groove (24). One side of the adjusting ring groove (24) is connected to the feed cavity (18) for adjustment. On the other side of the annular groove (24), there is a discharge annular port (25) that communicates with the coating tube (1). The outer edge of the adjusting annular groove (24) is provided with a pressure regulating assembly consisting of elastic thin plates (29) and arc plates (27) distributed circumferentially. The elastic thin plates (29) are attached to the arc sidewall of the extrusion annular plate (9). The arc plates (27) are pressed against the insulating molten raw material filled in the inner cavity of the adjusting annular groove (24). An adjusting screw (20) is provided on the arc sidewall of the extrusion annular plate (9) and abuts against the arc plate (27).

2. The insulation layer coating machine for producing plastic insulated control cables according to claim 1, characterized in that: The cooling assembly includes a water cooling device and an air cooling device. The air cooling device is located on the side near the extrusion ring plate (9) and includes an air inlet (7) located at the lower end of the coating tube (1) and having a built-in filter, and an exhaust fan (5) located above the coating tube (1) and facing the air inlet (7).

3. An insulation layer coating machine for producing plastic insulated control cables according to claim 2, characterized in that: The water cooling device includes a drip device (4) and a drain component (6). The drip device (4) has multiple sets of vertical parallel diversion pipes. The lower end of the pipes is directly opposite the insulation layer (3) of the bare cable (2) after it is wrapped. The drain component (6) is located directly below the drip device (4). The inner cavity of the drain component (6) is set as a cone, and the width of the cone opening at the upper end of the inner cavity is greater than the water outlet width at the lower end of the drip device (4).

4. An insulation layer coating machine for producing plastic insulated control cables according to claim 1, characterized in that: A stand (16) is provided on one side of the extrusion feeding assembly. One end of the feed outer tube (10) is fixed on the stand (16). The other end of the feed outer tube (10) is provided with a sealing ring cover (19) on one side of the sealing adjustment ring groove (24). The sealing ring cover (19) is fixedly connected to the extrusion ring plate (9). One end of the feed inner tube (17) is fixed on the stand (16). The other end of the feed inner tube (17) is fixedly connected to the limiting inner ring (8).

5. An insulation layer coating machine for producing plastic insulated control cables according to claim 4, characterized in that: The upright frame (16) is provided with a motor-driven drive gear (14). The spiral ring tube (12) includes a spiral section and a turntable. The spiral section is located in the feed cavity (18). The turntable fits the ends of the feed outer tube (10) and the feed inner tube (17). A stepped ring shaft (32) extending along the annular groove gap between the ends of the feed outer tube (10) and the feed inner tube (17) is provided on the outside of the turntable. The stepped ring shaft (32) passes through the upright frame (16), and the middle section of the stepped ring shaft (32) is rotatably connected to the upright frame (16) through a bearing (15). A toothed ring (13) is provided at the end of the stepped ring shaft (32), and the toothed ring (13) meshes with the drive gear (14).

6. An insulation layer coating machine for producing plastic insulated control cables according to claim 5, characterized in that: The annular groove gap formed at one end of the coaxial connection between the outer feed tube (10) and the inner feed tube (17) accommodates the stepped ring shaft (32) to rotate through and extend. The annular groove gap formed at the other end of the outer feed tube (10) and the inner feed tube (17) is set as an extrusion port (28). The extrusion port (28) is used to connect the inner feed cavity (18) and the adjusting annular groove (24).

7. An insulation layer coating machine for producing plastic insulated control cables according to claim 1, characterized in that: The outer arc wall of the extrusion ring plate (9) is provided with multiple sets of screw holes (26) arranged in a circumferential array. The multiple sets of screw holes (26) correspond one-to-one with the arc plate (27). An adjusting screw (20) is rotatably inserted into the screw hole (26). The other end of the adjusting screw (20) is rotatably mounted on the outer arc wall of the arc plate (27).

8. An insulation layer coating machine for producing plastic insulated control cables according to claim 7, characterized in that: The adjusting ring groove (24) is provided with a limiting stop ring (31) to limit the movement distance of the arc plate (27) towards the discharge ring (25). The arc plate (27) is fixedly connected to the elastic thin plate (29). The adjusting ring groove (24) is provided with a guide post (30) to facilitate the smooth bending of the elastic thin plate (29) towards the arc plate (27).

9. An insulation layer coating machine for producing plastic insulated control cables according to claim 8, characterized in that: One side of the adjustment ring groove (24) is connected to a plurality of detection tubes (23) arranged in a circular array. The detection tubes (23) are connected to the inner cavity of the adjustment ring groove (24), and a piston scale rod (21) is elastically installed inside the detection tubes (23). The inner ports of the plurality of detection tubes (23) arranged in a circular array correspond one-to-one with the arc plates (27) arranged in a circular interval.

10. An insulation layer coating machine for producing plastic insulated control cables according to claim 9, characterized in that: The outer port of the detection tube (23) is provided with an end cap. The piston scale rod (21) includes a piston that slides along the inner wall of the detection tube (23) and a scale rod that slides through the end cap and extends to the outer side of the detection tube (23). A spring (22) is sleeved on the outer wall of the scale rod. The spring (22) is located inside the detection tube (23) and is pressed between the piston and the end cap.

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