Automatic wrapping equipment and method for high-voltage cable insulation sheath
By using limit wheels and guide plates in the automatic wrapping equipment for high-voltage cable insulation sheaths, cooling airflow is sprayed out and guided by a conical shroud, solving the problem of incomplete shaping of high-voltage cable insulation sheaths before cooling and shaping. This improves the stability of wrapping and the cooling effect, thereby enhancing the forming quality of the cable.
Patent Information
- Application Number
- CN202510970711.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-15
- Publication Date
- 2025-11-14
AI Technical Summary
In the existing technology, when the insulation sheath of high-voltage cables is conveyed by limiting wheels before being cooled and shaped by cooling water, the wrapping material is not fully shaped, resulting in poor forming effect and problems such as uneven wrapping thickness.
The cable is driven by symmetrically distributed limiting wheels, which spray cooling air from the surface jet holes. At the same time, the design of the guide plate and conical cover changes the direction and range of the airflow, thereby achieving pre-cooling and cooling of the cable surface and avoiding deformation and damage when the limiting wheels come into contact.
It improves the horizontal stability and forming quality of cable wrapping, reduces deformation and residual air bubbles in the wrapping material, enhances the cooling effect on the cable surface, and improves the wrapping quality.
Smart Images
Figure CN120954821A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of high-voltage cable processing equipment, and particularly relates to an automatic wrapping device and method for high-voltage cable insulation sheath. Background Technology
[0002] In the production process of high-voltage cables, the wrapping of the insulating sheath is an important and critical step. The insulating sheath not only needs to have good electrical insulation performance to prevent safety issues such as current leakage and short circuits, but also needs to have sufficient mechanical strength and corrosion resistance to protect the internal conductor structure of the cable from the influence of the external environment.
[0003] The main method for wrapping the insulation sheath of high-voltage cables involves extruding insulating material using a screw extruder and then conveying it into a forming cavity. Once the cavity is full of material, it is extruded through the die lip under the combined action of pressure and temperature, thus achieving insulation wrapping of the high-voltage cable surface. However, in existing technologies, after the insulating material wraps the cable, it needs to be conveyed by a limiting wheel before cooling and shaping with cooling water. If the wrapped material is not fully shaped, contact conveying through the limiting wheel will result in poor wrapping or forming effect. Therefore, we propose an automatic wrapping device and method for high-voltage cable insulation sheaths to solve the above-mentioned problems. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an automatic wrapping device and method for high-voltage cable insulation sheath that can overcome or at least partially solve the above problems.
[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: an automatic wrapping device for high-voltage cable insulation sheath, including a screw extrusion device, a forming mold connected to one end of the screw extrusion device, a cable passing through the interior of the forming mold, a support frame provided on one side of the screw extrusion device, and further including: symmetrically distributed limiting wheels, which are attached to the surface of the cable; air jets, which are equally spaced on the surface of the limiting wheels; and a guide plate, which is disposed above one of the limiting wheels; wherein, when the two limiting wheels rotate relative to each other, they drive the cable to move, blowing air onto the coating layer on the surface of the cable after wrapping, and at the same time driving the guide plate to reciprocate up and down, changing the direction of the airflow at the limiting wheels.
[0006] Preferably, a rotating shaft is fixedly connected to the center of each of the two limiting wheels, a rotary joint is installed at one end of the rotating shaft, and a driving part is installed on the surface of one of the rotating shafts, the driving part being installed on the side of the support frame.
[0007] Preferably, rotating gears are fixedly connected to the surfaces of the two rotating shafts, and the two rotating gears mesh and drive each other. An air supply channel is opened inside the two rotating shafts, and the air supply channel is connected to the jet hole.
[0008] Preferably, a cam is fixedly connected to the surface of one of the rotating shafts, a connecting plate is attached to the surface of the cam, one end of the connecting plate is fixedly connected to the guide plate, and a limiting member is provided at the other end of the connecting plate.
[0009] Preferably, the limiting member includes a groove formed on the side of the support frame, the connecting plate is slidably connected in the groove, and a compression spring is fixedly connected to the top of the connecting plate, with one end of the compression spring fixed in the groove.
[0010] Preferably, the top inner wall of the guide plate has an air inlet, the inside of the guide plate has a cavity, one end of the guide plate is equipped with a jet head, and the cavity is connected to the air inlet and the jet head.
[0011] Preferably, a conical cover is fixedly connected to one side of the support frame. The conical cover is horn-shaped, and a vent hole is provided on one side of the conical cover. A limit ring is fixed to the inner wall of the conical cover near the vent hole.
[0012] Preferably, the other side of the conical cover is provided with an opening that is close to but does not contact the two limiting wheels.
[0013] Preferably, the surface of the support frame is rotatably connected to auxiliary rollers via bearings, and the surfaces of the two auxiliary rollers are in contact with the cable.
[0014] A method for using an automatic high-voltage cable insulation sheath wrapping device mainly includes the following steps:
[0015] Step A: The cable to be wrapped is first passed through the forming mold, and then the wrapped cable is conveyed by the conveying component on the support frame to the next process. The cable wrapped with the insulating protective sleeve is water-cooled and shaped. During the wrapping operation, the screw extrusion equipment is started in advance, and the insulating material is poured into the inside of the screw extrusion equipment and extruded and conveyed to the forming mold. The forming mold is equipped with a heating component to heat melt the material conveyed by the screw extrusion equipment. The heat melted material is extruded through the forming mold and wrapped around the surface of the cable. As the cable continues to move, the surface of the cable is wrapped with sheath material, and the wrapping operation is automatically completed.
[0016] Step B: After the cable is wrapped, two limit wheels symmetrically adhere to the surface of the cable, and the cable is pulled and conveyed by friction. While the limit wheels rotate, the joint air pump sprays cooling air through the air jet holes on the surface of the limit wheels. The sprayed air can spray the surface of the cable that is about to come into contact with the limit wheels. During this process, the guide plate can also move up and down to guide the airflow. Then, through the design of the conical cover, part of the airflow can be guided and directed away from the part of the cable that is in contact with the limit wheels, so that the cable can be pre-cooled by the cooling airflow after being wrapped in the protective sleeve.
[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:
[0018] This invention improves the horizontal stability of the cable in the wrapped state by setting symmetrically arranged limiting wheels, which protect and wrap the outer surface of the cable. On the other hand, by using air jet holes on the surface of the limiting wheels, the cooling airflow ejected from the air jet holes can cool down the wrapped part of the cable when it is being conveyed in contact with the cable and friction.
[0019] In this invention, the guide plate is driven to reciprocate up and down by rotating one of the limiting wheels. When the guide plate reciprocates up and down, it collects the airflow ejected from the top of one of the limiting wheels and transfers it to both sides of the cable during the conveying process, thereby increasing the jet range of the airflow.
[0020] This invention features a conical shroud installed on one side of two limiting wheels and fitted over the wrapped cable during transport. When airflow is emitted from the jet nozzle, the conical shroud's shape guides a portion of the airflow away from the contact area between the cable and the limiting wheels. This allows the cable to be pre-cooled by the cooling airflow after being wrapped in the protective sleeve. When the guide plate moves downward, it diverts some of the airflow to the conical shroud. In the reciprocating motion, the airflow is emitted intermittently with varying intensity, eliminating residual air bubbles from the vulcanization process of the protective sleeve and improving the quality of cable wrapping. Attached Figure Description
[0021] In the attached diagram:
[0022] Figure 1 This is a schematic diagram of the overall structure of an automatic wrapping device for high-voltage cable insulation sheaths proposed in this invention;
[0023] Figure 2 This is a top view schematic diagram of an automatic wrapping device for high-voltage cable insulation sheaths proposed in this invention;
[0024] Figure 3This is a side sectional view of an automatic wrapping device for high-voltage cable insulation sheaths proposed in this invention.
[0025] Figure 4 This is a schematic diagram of the left cross-sectional structure of an automatic wrapping device for high-voltage cable insulation sheath proposed in this invention;
[0026] Figure 5 The present invention proposes Figure 4 Enlarged structural diagram of region A in the middle;
[0027] Figure 6 This is a partial three-dimensional structural diagram of the limiting roller installed on the support frame proposed in this invention.
[0028] Figure 7 The present invention proposes Figure 6 Enlarged structural diagram of region B in the middle;
[0029] Figure 8 This is a partial three-dimensional structural diagram of the guide plate proposed in this invention.
[0030] In the diagram: 1. Screw extruder; 2. Molding die; 3. Support frame; 4. Cable; 51. Rotating shaft; 52. Drive unit; 53. Limiting wheel; 531. Air jet orifice; 54. Air delivery channel; 55. Rotating gear; 56. Rotary joint; 57. Auxiliary roller; 61. Cam; 62. Connecting plate; 63. Compression spring; 64. Slide groove; 65. Guide plate; 66. Cavity; 67. Air jet head; 68. Air inlet; 71. Conical shroud; 72. Limiting ring; 73. Vent hole. Detailed Implementation
[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.
[0032] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0033] In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0034] Example 1: Refer to Figures 1-8An automatic wrapping device for high-voltage cable insulation sheathing includes a screw extruder 1, with a forming mold 2 connected to one end of the screw extruder 1. A cable 4 passes through the interior of the forming mold 2. A support frame 3 is provided on one side of the screw extruder 1. The device also includes: symmetrically distributed limiting wheels 53, which are attached to the surface of the cable 4; air jets 531, which are equally spaced on the surface of the limiting wheels 53; and a guide plate 65, which is disposed above one of the limiting wheels 53. When the two limiting wheels 53 rotate relative to each other, they drive the cable 4 to move, blowing air onto the sheathing layer on the surface of the cable 4 after wrapping. At the same time, the guide plate 65 moves back and forth, changing the direction of the airflow at the limiting wheels 53.
[0035] In use, the cable 4 to be wrapped is first passed through the forming mold 2, and then the wrapped cable 4 is conveyed by the conveying component on the support frame 3 to the next process. The cable wrapped with the insulating protective sleeve is then water-cooled and shaped. During the wrapping operation, the screw extruder 1 is started in advance, and the insulating material is poured into the inside of the screw extruder 1 and extruded and conveyed to the forming mold 2. The forming mold 2 is equipped with a heating component to heat-melt the material conveyed by the screw extruder 1. The heat-melted material is extruded through the forming mold 2 and wrapped around the surface of the cable 4. As the cable 4 continues to move, the surface of the cable 4 is wrapped with sheath material, and the wrapping operation is automatically completed. This is prior art and will not be described in detail here.
[0036] After the cable 4 is wrapped, it needs to be conveyed to the cooling water shaping area by a conveying component to cool and shape the surface sheath, so that the sheath can better adhere and fix it to the cable 4. However, before the cooling water shaping, it needs to be limited by the conveying of the limiting wheel 53. If the wrapped material is not fully shaped, it will result in poor wrapping or shaping effect after being conveyed by the limiting wheel 53. If the conveying wheel is not used for conveying and auxiliary limiting, the cable 4 is more likely to have uneven wrapping thickness during the wrapping stage. Therefore, in this invention, by setting the limiting wheel 53 with a flexible structure, after the cable 4 is wrapped, the two limiting wheels 53 are symmetrically attached to the surface of the cable 4, and the cable 4 is pulled and conveyed by friction conveying. On the one hand, it reduces the deformation of the wrapping material on the outer surface of the cable 4. On the other hand, the two limiting wheels 53 have a hollow structure and can be connected to an air pump. While the limiting wheel 53 rotates, cooling airflow is sprayed out through the air jet hole 531. The ejected airflow cools the surface of the cable 4 that is about to come into contact with the limiting wheel 53. The rotation of one of the limiting wheels 53 drives the guide plate 65 to move up and down. When the guide plate 65 moves up and down, it collects the airflow ejected from the top of one of the limiting wheels 53 and transfers it to both sides of the cable during the transport process, increasing the spray range of the airflow. A conical cover 71 is also provided, installed on one side of the two limiting wheels 53 and fitted over the outside of the wrapped cable during transport. When airflow is ejected from the spray hole 531, the shape design of the conical cover 71 can guide part of the airflow away from the contact area between the cable and the limiting wheel 53, so that the cable can be pre-cooled by the cooling airflow after being wrapped in the protective sleeve. When the guide plate 65 moves down, it can divert part of the airflow to the conical cover 71. In the reciprocating motion, the airflow is ejected in an intermittent manner with varying intensity, eliminating residual air bubbles from the vulcanization process of the protective sleeve and improving the quality of the cable wrapping.
[0037] Example 2: Refer to Figure 5 Figure 6 and Figure 7Similar to Embodiment 1, but further: a rotating shaft 51 is fixedly connected to the center of each of the two limiting wheels 53, a rotary joint 56 is installed at one end of the rotating shaft 51, a drive unit 52 is installed on the surface of one of the rotating shafts 51, the drive unit 52 is installed on the side of the support frame 3, a rotating gear 55 is fixedly connected to the surface of the two rotating shafts 51, the two rotating gears 55 mesh and drive each other, an air supply channel 54 is opened inside the two rotating shafts 51, the air supply channel 54 is connected to the jet hole 531, a cam 61 is fixedly connected to the surface of one of the rotating shafts 51, a connecting plate 62 is attached to the surface of the cam 61, one end of the connecting plate 62 is fixedly connected to the guide plate 65, the other end of the connecting plate 62 is provided with a limiting member, an auxiliary roller 57 is rotatably connected to the surface of the support frame 3 through a bearing, and the surfaces of the two auxiliary rollers 57 are attached to the cable 4.
[0038] In this invention, the drive unit 52 uses a geared motor instead of a drive. When the cable 4 is wrapped and needs to be conveyed by friction through the limit wheels 53, the drive unit 52 is started to drive the rotating shaft 51 to rotate. The rotating shaft 51 is equipped with rotating gears 55. The two rotating gears 55 mesh and drive each other, so that the two limit wheels 53 move in opposite directions, thereby realizing the conveying operation of the cable 4. The limit wheels 53 are made of rubber material and have good deformation performance. When it is necessary to wrap special cables, such as when the diameter of some cables changes at a certain stage, the characteristics of the material of the limit wheels 53 can better adapt to the cable 4 being transmitted, thereby reducing excessive compression damage to the surface of the cable 4.
[0039] Air delivery hoses are connected to one end of the two rotary joints 56 to facilitate the delivery of cooling gas to the interior of the rotating shaft 51. The cooling airflow passes through the air delivery channel 54 and is then ejected through multiple jet holes 531. As the cooling airflow is ejected from the jet holes 531, it facilitates the cooling and temperature reduction of the material wrapped on the outer surface of the incoming cable 4, effectively reducing the damage caused to the material layer wrapped around the cable 4 during frictional conveying. The rotary joints 56 ensure that the air delivery hoses are connected while the rotating shaft 51 delivers air normally. This structural design avoids the inability of traditional conveying structures to adapt to changes in the diameter of the cable 4 when in contact with it, increasing the applicability and flexibility of the device. The auxiliary roller 57 is also made of rubber material and has a hollow sealed structure inside, which fits tightly with the cable 4 to assist in the conveying and movement of the cable 4. When the diameter of the cable 4 changes, the auxiliary roller 57 deforms accordingly.
[0040] Example 3: Reference Figure 3 , Figure 7 and Figure 8The invention is basically the same as in Embodiment 2, but further: the limiting component includes a groove 64 opened on the side of the support frame 3, the connecting plate 62 is slidably connected in the groove 64, the top of the connecting plate 62 is fixedly connected to a compression spring 63, one end of the compression spring 63 is fixed in the groove 64, the top inner wall of the guide plate 65 is provided with an air inlet 68, the inside of the guide plate 65 is provided with a cavity 66, one end of the guide plate 65 is installed with a jet head 67, and the cavity 66 is connected to the air inlet 68 and the jet head 67.
[0041] In this invention, when one of the rotating shafts 51 rotates, it drives the cam 61 to rotate synchronously. The cam 61 presses against the connecting plate 62. Under the limitation of the slide groove 64 and with the elastic reset of the compression spring 63, the guide plate 65 at one end of the connecting plate 62 moves up and down reciprocally. When the guide plate 65 moves down, the airflow ejected from the jet hole 531 near the guide plate 65 on the surface of the limiting wheel 53 is collected through the air inlet 68 and then transported to the jet head 67 through the cavity 66. Finally, a strong airflow is ejected through the two jet heads 67. The two jet heads 67 are located at the two ends of the through-feed cable 4. On the side, it can supplement the weak air jet areas on both sides of the cable 4. When the guide plate 65 moves upward, the amount of air entering the air inlet 68 is small, and the air jet from the jet head 67 is weak. The intermittent strong and weak jet method is adopted. The instantaneous high pressure forces the molten rubber molecular chains to stretch and form an axially ordered arrangement, which improves the tensile strength. The low pressure period allows the molecular chains to relax locally, eliminate internal stress, optimize the elastic modulus, and the alternating strong and weak air jet can peel off the interface bubbles of the wrapped rubber layer. The elastic restoring force of the compression spring 63 is greater than the maximum air pressure of the air jet from the limit wheel 53.
[0042] Example 4: Reference Figure 3 Similar to Embodiment 3, but further: a conical cover 71 is fixedly connected to one side of the support frame 3. The conical cover 71 is horn-shaped. A vent hole 73 is provided on one side of the conical cover 71. A limit ring 72 is fixed on the inner wall of the conical cover 71 near the vent hole 73. An opening is provided on the other side of the conical cover 71. The opening is close to the two limit wheels 53 but does not contact them.
[0043] When airflow is ejected from the jet hole 531 at the limiting wheel 53, the airflow near the conical cover 71 on the side is guided and limited by the conical cover 71, and then limited again by the limiting ring 72, and finally blows onto the surface of the through cable 4, pre-cooling the surface of the newly wrapped cable 4 and accelerating the dissipation of heat. The conical cover 71 is made of copper sheet material, which has a good heat dissipation effect. The conical cover 71 is designed in a conical shape, and the cable 4 is inside the conical body. Since the ejected airflow is intercepted inside the conical cover 71, a longer section of the cable 4 can be pre-cooled, increasing the pre-cooling range of the cable 4. The setting of the vent hole 73 avoids the conical cover 71 from contacting the cable 4, which is convenient to adapt to changes in the diameter of the cable 4, leaves a certain space, and facilitates the discharge of heated airflow.
[0044] A method for using an automatic high-voltage cable insulation sheath wrapping device mainly includes the following steps: Step A: The cable 4 to be wrapped is passed through the forming mold 2 in advance, and then the wrapped cable 4 is conveyed by the conveying component on the support frame 3 and moved to the next process. The cable wrapped with the insulation sheath is cooled and shaped by water cooling. During the wrapping operation, the screw extruder 1 is started in advance, and the insulation material is poured into the inside of the screw extruder 1 and extruded and conveyed to the forming mold 2. The forming mold 2 is equipped with a heating component for heat melting the material conveyed by the screw extruder 1. The heat-melted material is extruded through the forming mold 2 and wrapped around the surface of the cable 4. As the cable 4 continues to move, the surface of the cable 4 is wrapped with sheath material, and the wrapping operation is automatically completed.
[0045] Step B: After the cable 4 is wrapped, two limiting wheels 53 are symmetrically attached to the surface of the cable 4, and the cable 4 is pulled and transported by friction conveying. At the same time as the limiting wheels 53 rotate, the joint air pump sprays cooling air through the air jet holes 531 on the surface of the limiting wheels 53. The sprayed air can spray air onto the surface of the cable 4 that is about to come into contact with the limiting wheels 53. During this process, the guide plate 65 can also move up and down to guide the airflow direction. Then, through the shape design of the conical cover 71, part of the airflow can be guided and directed away from the part of the cable that comes into contact with the limiting wheels 53, so that the cable can be pre-cooled by the cooling air after being wrapped in the protective sleeve.
[0046] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of these fall within the protection scope of the present invention.
Claims
1. An automatic wrapping device for high-voltage cable insulation sheaths, comprising a screw extruder (1), wherein a forming mold (2) is connected and installed at one end of the screw extruder (1), a cable (4) passes through the interior of the forming mold (2), and a support frame (3) is provided on one side of the screw extruder (1), characterized in that, Also includes: The symmetrically distributed limiting wheels (53) are attached to the surface of the cable (4); Air jets (531) are evenly spaced on the surface of the limiting wheel (53); A deflector (65) is positioned above one of the limiting wheels (53); When the two limiting wheels (53) rotate relative to each other, they drive the cable (4) to move, blow air onto the coating layer on the surface of the cable (4), and at the same time drive the guide plate (65) to move up and down repeatedly, changing the direction of the airflow at the limiting wheel (53).
2. The automatic wrapping device for high-voltage cable insulation sheath according to claim 1, characterized in that, A rotating shaft (51) is fixedly connected to the center of each of the two limiting wheels (53). A rotary joint (56) is installed at one end of the rotating shaft (51). A driving part (52) is installed on the surface of one of the rotating shafts (51). The driving part (52) is installed on the side of the support frame (3).
3. The automatic wrapping device for high-voltage cable insulation sheath according to claim 2, characterized in that, Rotating gears (55) are fixedly connected to the surfaces of the two rotating shafts (51), and the two rotating gears (55) mesh and drive each other. An air supply channel (54) is opened inside the two rotating shafts (51), and the air supply channel (54) is connected to the jet hole (531).
4. The automatic wrapping device for high-voltage cable insulation sheath according to claim 3, characterized in that, A cam (61) is fixedly connected to the surface of one of the rotating shafts (51), and a connecting plate (62) is attached to the surface of the cam (61). One end of the connecting plate (62) is fixedly connected to the guide plate (65), and the other end of the connecting plate (62) is provided with a limiting member.
5. The automatic wrapping device for high-voltage cable insulation sheath according to claim 4, characterized in that, The limiting component includes a groove (64) opened on the side of the support frame (3), the connecting plate (62) is slidably connected in the groove (64), and a compression spring (63) is fixedly connected to the top of the connecting plate (62), with one end of the compression spring (63) fixed in the groove (64).
6. The automatic wrapping device for high-voltage cable insulation sheath according to claim 5, characterized in that, An air inlet (68) is provided on the inner wall of the top of the guide plate (65), and a cavity (66) is provided inside the guide plate (65). A jet head (67) is installed at one end of the guide plate (65), and the cavity (66) is connected to the air inlet (68) and the jet head (67).
7. The automatic wrapping device for high-voltage cable insulation sheath according to claim 6, characterized in that, A conical cover (71) is fixedly connected to one side of the support frame (3). The conical cover (71) is horn-shaped. A vent hole (73) is opened on one side of the conical cover (71). A limit ring (72) is fixed on the inner wall of the conical cover (71) near the vent hole (73).
8. The automatic wrapping device for high-voltage cable insulation sheath according to claim 7, characterized in that, An opening is provided on the other side of the conical cover (71), which is close to but does not contact the two limiting wheels (53).
9. The automatic wrapping device for high-voltage cable insulation sheath according to claim 1, characterized in that, The surface of the support frame (3) is rotatably connected to auxiliary rollers (57) via bearings, and the surfaces of the two auxiliary rollers (57) are in contact with the cable (4).
10. A method of using an automatic high-voltage cable insulation sheath wrapping device, as described in claim 8, characterized in that... The main steps include: Step A: The cable (4) to be wrapped is passed through the forming mold (2) in advance, and then the wrapped cable (4) is conveyed by the conveying component on the support frame (3) and moved to the next process. The cable wrapped with the insulating protective sleeve is cooled and shaped by water cooling. During the wrapping operation, the screw extrusion equipment (1) is started in advance, and the insulating material is poured into the inside of the screw extrusion equipment (1) and squeezed and conveyed to the forming mold (2). The forming mold (2) is equipped with a heating component for heat melting the material conveyed by the screw extrusion equipment (1). The heat-melted material is extruded through the forming mold (2) and wrapped around the surface of the cable (4). As the cable (4) continues to move, the surface of the cable (4) is wrapped with sheath material, and the wrapping operation is completed automatically. Step B: After the cable (4) is wrapped, two limit wheels (53) are symmetrically attached to the surface of the cable (4) and the cable (4) is pulled and transported by friction conveying. While the limit wheels (53) are rotating, the joint air pump sprays out cooling air through the air jet hole (531) on the surface of the limit wheels (53). The sprayed air can spray air onto the surface of the cable (4) that is about to contact the limit wheels (53). In this process, the guide plate (65) can also move up and down to guide the airflow direction. Then, through the shape design of the conical cover (71), part of the airflow can be guided and directed away from the part of the cable that is in contact with the limit wheels (53), so that the cable can be pre-cooled by the cooling air after being wrapped in the protective sleeve.