High temperature resistant polyvinyl chloride insulated cable and production device thereof

Abstract

The application discloses a high-temperature-resistant polyvinyl chloride insulated cable and a production device thereof, and relates to the technical field of cable production. The device comprises a feeding mechanism, an abrasive mechanism and an extrusion mechanism. The feeding mechanism is used for releasing a single conductor. The abrasive mechanism is used for brushing the surface of the conductor in the axial direction. The extrusion mechanism is used for extruding a sheath on the surface of the conductor. The device further comprises a blowing mechanism, which comprises a shell, an impeller disc and a gas distribution disc. The outer edge of the impeller disc is connected with the inner wall of the shell through a bearing. The outer edge of the gas distribution disc is attached to the inner wall of the shell. A gas conveying pipe is arranged between the gas distribution disc and the side wall of the shell. The middle part of the impeller disc is provided with a first perforation, and the first perforation is provided with a brush hair wrapped around the conductor. The application has the characteristics of improving the cleanliness of the conductor surface and the adhesion effect of the sheath on the conductor surface.

Description

Technical Field

[0001] This application relates to the field of cable manufacturing technology, specifically to a high-temperature resistant polyvinyl chloride insulated cable and its manufacturing apparatus. Background Technology

[0002] Cables are typically made up of several or groups of conductors twisted together to resemble a rope. Each group of conductors is insulated from the others, and the entire cable is covered with a highly insulating outer layer. In addition, to improve the overall strength of the cable, a reinforcing frame is set in the middle of the groups of conductors.

[0003] In existing related technologies, the production of single-strand conductors generally involves steps such as conductor → conductor stranding or bundle → insulation injection molding → withstand voltage test. Chinese patent document CN219634467U discloses a cable extrusion production line, specifically disclosing a wire feeding device, an extrusion device, and a wire take-up device arranged sequentially along the process direction. The wire feeding device is equipped with a straightening table; the wire take-up device is equipped with a traction machine; the extrusion device includes an extruder with an extrusion die, the extrusion die including an outer die and a die core placed inside the outer die, the die core having a cable core channel communicating with the outer die, and an extrusion channel communicating with both the cable core channel and the outer die between the die core and the outer die. The outlet end of the straightening table is opposite to the inlet end of the cable core channel, and the outlet end of the cable core channel is opposite to the inlet end of the traction machine. This cable extrusion production line is convenient to use and highly practical, ensuring that the cable core does not easily shake during extrusion molding of the sheath on the outer surface of the cable core, thus guaranteeing the stability of the sheath diameter on the cable core.

[0004] However, the patent does not clean the cable core before straightening it. Dust will adhere to the cable core during the traction process. This dust will rub against the cable core during straightening and may even be pressed into the inside of the cable core, affecting the injection molding effect of the cable core sheath. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a high-temperature resistant polyvinyl chloride insulated cable and its production apparatus.

[0006] In the first aspect, this application provides a production apparatus for high-temperature resistant polyvinyl chloride insulated cables, and achieves this through the following technical solution:

[0007] A high-temperature resistant polyvinyl chloride insulated cable production apparatus includes a feeding mechanism, an abrasive mechanism, and an extrusion mechanism. The feeding mechanism is used to release a single strand of conductor, the abrasive mechanism is used to abrade the surface of the conductor along the axial direction, and the extrusion mechanism is used to extrude a sheath on the surface of the conductor. It also includes a purging mechanism disposed between the feeding mechanism and the abrasive mechanism. The purging mechanism includes a housing, an impeller disk, and an air distribution disk.

[0008] The outer edge of the impeller disk is connected to the inner wall of the housing by a bearing, the outer edge of the air distribution disk is in contact with the inner wall of the housing, and an air supply pipe is provided between the air distribution disk and the side wall of the housing.

[0009] The impeller disk has a first perforation in the middle, the air distribution disk has a second perforation in the middle, and the side wall of the housing has a third perforation. The conductor passes through the first perforation, the second perforation and the third perforation in sequence. The first perforation has bristles that wrap around the conductor.

[0010] By adopting the above technical solution, the feeding mechanism, blowing mechanism, abrasive mechanism and extrusion mechanism are arranged in a row. The conductor is first blown to achieve dust removal, then the conductor is brushed to achieve oil removal, and finally the sheath is extruded to wrap the conductor. The process is reasonable and can reliably remove dust from the conductor surface, prevent dust from being pressed into the conductor during the abrasive process, and effectively improve the injection molding effect of the sheath on the conductor surface.

[0011] Optionally, the bottom of the housing is provided with a support leg, the housing and the conductor are coaxially arranged, the housing includes a tube with two open ends and a cylindrical part with one open end and one closed end, and the tube and the cylindrical part are connected by a flange.

[0012] The outer ring of the bearing is connected to the inner wall of the tube, the outer edge of the impeller disk is connected to the inner ring of the bearing, and the outer edge of the air distribution plate is connected to the inner wall of the cylinder.

[0013] By adopting the above technical solution, the housing itself is designed to be detachable, which facilitates cleaning and maintenance of the housing and the impeller and air distribution plate inside the housing after disassembly. The bearing setting ensures that the impeller can rotate automatically under the action of the gas blown out of the air pipe, thereby realizing the brushing of the conductor.

[0014] Optionally, a plurality of pads are provided at intervals along the same circumference on the inner wall of the tube, and the plurality of pads clamp the bearing, forming an air outlet channel between the outer ring of the bearing and the inner wall of the tube.

[0015] By adopting the above technical solution, the gas blown out by the gas pipe can be discharged outward through the gas outlet channel, realizing smooth airflow and facilitating the removal of dust from the conductor surface.

[0016] Optionally, the inner diameter of the first perforation is greater than twice the outer diameter of the conductor, and the inner diameters of the second and third perforations are the same and both are greater than twice the outer diameter of the conductor;

[0017] All of the bristles extend radially along the impeller disk and point toward the axis of the first perforation.

[0018] By adopting the above technical solution, the inner diameter of the first perforation is relatively large, which leaves space for the installation of the bristles and facilitates the flow of gas out of the first perforation. The inner diameters of the second and third perforations are slightly larger than the outer diameter of the conductor, which ensures that the conductor can pass through reliably while reducing the amount of gas discharged from the second and third perforations.

[0019] Optionally, the air distribution plate is separated from the side wall of the cylinder to form an air cavity. The air distribution plate is provided with a plurality of air distribution holes. The air supply pipe is used to supply gas into the air cavity. The gas can pass through the plurality of air distribution holes. The flow direction of the gas in the housing is opposite to the release direction of the conductor.

[0020] By adopting the above technical solution, the gas discharged from the gas delivery pipe first enters the gas chamber, and then is blown evenly towards the impeller disk through the air distribution plate, ensuring that the impeller disk can be driven to rotate while carrying out dust from the casing to the greatest extent.

[0021] Optionally, the density of the air distribution holes gradually decreases from the axis of the second perforation outwards.

[0022] By adopting the above technical solution, the purging effect of gas on the conductor surface is improved.

[0023] Optionally, the air distribution plate is provided with at least one pair of embossing components on the side opposite to the impeller disk, the embossing components being used to imprint grooves on the surface of the conductor;

[0024] By adopting the above technical solution, grooves can be pressed into the surface of the conductor, thereby improving the adhesion of the sheath to the conductor surface.

[0025] Optionally, the crimping assembly includes a main rod and a pressure roller. The main rod is fixed to the air distribution plate by a pipe clamp. Each of the opposite end faces of the main rods is provided with a threaded hole. An auxiliary rod is adapted to be screwed into the threaded hole. The auxiliary rod is provided with a rotating seat at one end outside the threaded hole. The pressure roller is mounted on the rotating seat and can rotate around the rotation axis of the rotating seat. The pressure roller presses against the outer wall of the conductor.

[0026] By adopting the above technical solution, the distance between the two pressure rollers in a pair of denting components can be adjusted, thereby controlling the denting effect.

[0027] Optionally, the pipe clamp is provided with a stud, the stud is inserted into the corresponding air distribution hole, and a nut is adaptedly screwed on the stud. The nut and the pipe clamp are respectively located on both sides of the air distribution plate.

[0028] By adopting the above technical solution, the air distribution holes can be used to fix the pipe clamps, thereby achieving reliable fixation of the main rod.

[0029] Optionally, the thickness of the pressure roller gradually decreases from the axis outwards.

[0030] By adopting the above technical solution, the part of the pressure roller that contacts the conductor is thinner, making it easier to form grooves on the surface of the conductor.

[0031] Secondly, this application provides a high-temperature resistant polyvinyl chloride insulated cable, which is achieved using the following technical solution:

[0032] A high-temperature resistant polyvinyl chloride insulated cable is manufactured by a high-temperature resistant polyvinyl chloride insulated cable production apparatus. It includes an insulating sleeve and multiple conductors passing through the insulating sleeve. A sheath is fitted on the outer wall of the conductor and is embedded in the groove of the conductor. A support frame is also provided between the multiple conductors.

[0033] By adopting the above technical solution, under the support of the supporting frame, multiple conductors can be reliably assembled inside the insulating sleeve, and a heat dissipation space can be formed between the multiple conductors. Furthermore, under the action of the groove, the sheath can more tightly wrap the conductors.

[0034] Compared with the prior art, this application has the following advantages:

[0035] 1. Gas is delivered into the housing through the gas supply pipe. The gas moves in the opposite direction to the conductor, thereby blowing away dust from the conductor surface and improving the surface cleanliness of the conductor.

[0036] 2. As the gas exits the casing, it pushes the impeller disk. When the impeller disk rotates, the bristles in the first perforation can perform radial brushing on the conductor, further improving the cleaning effect on the conductor surface.

[0037] 3. During the conductor transport process, the pressure roller and the conductor will interact, thereby forming a groove on the surface of the conductor, which facilitates the sheath extruded by the extrusion mechanism to adhere to the surface of the conductor. Attached Figure Description

[0038] Figure 1 This is a schematic perspective view of this application;

[0039] Figure 2 This is a reference diagram showing the position and status of the purging mechanism and conductor;

[0040] Figure 3 This is a reference diagram showing the explosion state of the purging mechanism;

[0041] Figure 4 This is a reference diagram showing the assembly state of the tube section and the impeller disk;

[0042] Figure 5 This is a schematic three-dimensional view of the embossed component;

[0043] Figure 6 This is a reference diagram showing the assembly state of the conductor;

[0044] In the diagram: 1. Feeding mechanism;

[0045] 2. Abrasive mechanism; 20. Abrasive belt;

[0046] 3. Extrusion mechanism;

[0047] 4. Conductor; 41. Sheath; 42. Groove;

[0048] 5. Purging mechanism;

[0049] 51. Shell; 511. Third perforation; 512. Support leg; 513. Tube section; 514. Cylinder section; 515. Flange; 516. Gasket; 517. Air outlet passage;

[0050] 52. Impeller disk; 521. First perforation; 522. Brush bristles;

[0051] 53. Air distribution plate; 531. Second perforation; 532. Air distribution hole;

[0052] 54. Bearings;

[0053] 55. Gas pipeline;

[0054] 56. Engraving assembly; 561. Main rod; 5611. Pipe clamp; 5612. Threaded hole; 5613. Stud; 5614. Nut; 562. Pressure roller; 563. Auxiliary rod; 5630. Rotating seat;

[0055] 6. Insulating sleeve; 60. Support frame. Detailed Implementation

[0056] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0057] This embodiment discloses a production apparatus for high-temperature resistant polyvinyl chloride insulated cables.

[0058] Figure 1 This is a schematic perspective view of this application. See also Figure 1A production apparatus for high-temperature resistant polyvinyl chloride (PVC) insulated cables includes a feeding mechanism 1, a blowing mechanism 5, an abrasive mechanism 2, and an extrusion mechanism 3 arranged in a row. The feeding mechanism 1 releases the coiled conductor 4 outward, meaning the conductor 4 can be conveyed outward in a single strand. After passing through the blowing mechanism 5, the conductor 4 has its surface dust blown off. After the conductor 4 passes through the blowing mechanism 5 and enters the abrasive mechanism 2, the upper and lower abrasive belts 20 of the abrasive mechanism 2 can contact the conductor 4. By controlling the rotation speed of the abrasive belts, axial brushing can be generated between the abrasive belts and the conductor 4, thereby removing oil stains and oxides from the surface of the conductor 4 and also straightening the conductor 4. After the conductor 4 passes through the abrasive mechanism 2 and enters the extrusion mechanism 3, the extruder in the extrusion mechanism 3 can extrude a sheath 41 onto the surface of the conductor 4, forming a protective effect and achieving an insulation effect.

[0059] Figure 2 This is a reference diagram showing the position and status of the purging mechanism and conductor. Figure 3 This is a reference diagram showing the explosion state of the purging mechanism. See also... Figure 2 and Figure 3 The purging mechanism 5 includes a housing 51, an impeller disk 52, and an air distribution disk 53. The housing 51 includes a tube 513 open at both ends and a cylindrical section 514 open at one end and closed at the other. A flange 515 is provided on the end face of the tube 513 facing the cylindrical section 514 and on the end face of the cylindrical section 514 facing the tube 513. The two flanges 515 can be bolted together after mating, thus completing the connection between the tube 513 and the cylindrical section 514. Support legs 512 are provided at the bottom of the housing 51. The support legs 512 can be located at the bottom of the cylindrical section 514, the bottom of the tube 513, or both the tube 513 and the cylindrical section 514, ensuring that the housing 51 can be stably placed coaxially with the conductor 4.

[0060] Figure 4 This is a reference diagram showing the assembly state of the tube section and impeller disk. See also... Figure 4 and combined Figure 2 A plurality of pads 516 are provided on the inner wall of the tube section 513, and the pads 516 are arranged at intervals within the same circumference. A bearing 54 is also provided on the inner side of the tube section 513, and the outer ring of the bearing 54 is connected to the pads 516, so that the pads 516 clamp and fix the bearing 54. The outer edge thickness of the impeller disk 52 is greater than the thickness of the bearing 54, so that the impeller disk 52 can be reliably placed in the inner ring of the bearing 54. When an interference fit is formed between the impeller disk 52 and the bearing 54, the impeller disk 52 can rotate reliably. After the bearing 54 and the impeller disk 52 are fixed, due to the spaced pads 516, an air outlet channel 517 is formed between the outer wall of the outer ring of the bearing 54 and the inner wall of the tube section 513.

[0061] See Figure 3 An air distribution plate 53 is disposed at the opening of the cylindrical portion 514, and the air distribution plate 53 and the cylindrical portion 514 can be fixedly connected or detachably connected. The air distribution plate 53 has several air distribution holes 532, with a higher density of holes in the center and a lower density at the outer edge. The air distribution plate 53 is separated from the side wall of the cylindrical portion 514, thus forming an air cavity between them. An air delivery pipe 55 is provided on the outer wall of the cylindrical portion 514, which can deliver gas into the air cavity.

[0062] See Figure 2 and Figure 4 A first through hole 521 is provided in the middle of the impeller disk 52, a second through hole 531 is provided in the middle of the air distribution disk, and a third through hole 511 is provided on the side wall of the housing 51. The conductor 4 passes through the first through hole 521, the second through hole 531, and the third through hole 511 in sequence, thereby achieving the transport of the conductor 4 within the housing 51. During the transport of the conductor 4, the air supply pipe 55 continuously supplies gas into the air chamber and increases the air pressure within the air chamber. At this time, under the action of the air distribution disk 53, the gas can flow relatively evenly from the air chamber towards the impeller disk 52. Because the density of the air distribution holes 532 is relatively high in the middle of the air distribution disk 53, that is, there are more air distribution holes 532 near the second through hole 531, a relatively large amount of gas is blown out from this area, thus achieving a purging effect on the surface of the conductor 4. After passing through the air distribution plate 53, part of the airflow directly contacts the impeller disk 52, while the rest is discharged directly outward through the air outlet channel 517. The gas in contact with the impeller disk 52 drives it to rotate. Furthermore, several bristles 522 are provided on the inner wall of the first perforation 521. These bristles 522 extend radially along the impeller disk 52 and point towards the axis of the first perforation 521. In this way, the bristles 522 form a comprehensive wrapping effect on the conductor 4. When the impeller disk 52 rotates under the push of the gas, the bristles 522 form a radial brushing effect on the conductor 4. Combined with the flowing gas, this reliably removes dust from the surface of the conductor 4 and discharges the dust outward through the first perforation 521 or the air outlet channel 517. Since the gas flow direction is opposite to the conductor 4 conveying direction, the dust removal effect on the surface of the conductor 4 can be maximized.

[0063] See Figure 2 and Figure 3The inner diameter of the first perforation 521 is greater than twice the outer diameter of the conductor 4. The inner diameters of the second perforation 531 and the third perforation 511 are the same and both greater than twice the outer diameter of the conductor 4. Specifically, the inner diameter of the first perforation 521 can be much larger than the outer diameter of the conductor 4, while the inner diameters of the second perforation 531 and the third perforation 511 need to be as close as possible to the outer diameter of the conductor 4. In this way, the overall size of the first perforation 521 is larger, which can accommodate more and longer bristles 522, thereby improving the dust removal and discharge effect. The overall size of the second perforation 531 and the third perforation 511 is smaller, just enough to allow the conductor 4 to pass through. This minimizes gas leakage at the second perforation 531 and the third perforation 511, thus ensuring smoother gas flow.

[0064] Figure 5 This is a schematic perspective view of the embossed assembly. See also... Figure 5 and combined Figure 3 and Figure 2 The air distribution plate 53 has at least one pair of embossing components 56 on the side facing away from the impeller plate 52. The embossing components 56 are used to emboss grooves 42 on the surface of the conductor 4. Specifically, the embossing components 56 include a main rod 561 and a pressure roller 562. At least two pipe clamps 5611 are fitted on the outer wall of the main rod 561. The outer wall of the pipe clamps 5611 is provided with studs 5613. By adjusting the relative position between the pipe clamps 5611 and the main rod 561, the studs 5613 can be inserted into the appropriate air distribution holes 532. At this time, a nut 5614 is screwed onto the studs 5613 from the other side of the air distribution plate 53 to fix the main rod 561. The studs 5613 will only occupy a smaller portion of the air distribution holes 532 and will not affect the flow of gas. Each of one or more pairs of main rods 561 has a threaded hole 5612 on its end face. Each pair of main rods 561 is coaxially aligned, resulting in the two threaded holes 5612 on each pair of main rods 561 being positioned opposite each other. An auxiliary rod 563 is screwed into the threaded hole 5612. One end of the auxiliary rod 563 is screwed into the threaded hole 5612, and the other end is located outside the threaded hole 5612. A rotating seat 5630 is provided at the other end face of the auxiliary rod 563. The rotating seat 5630 includes a rotating shaft, and a pressure roller 562 is sleeved on the rotating shaft. The pressure roller 562 can rotate around the rotating shaft or rotate synchronously with the rotating shaft; that is, the pressure roller 562 can rotate around its own axis within the rotating seat 5630.

[0065] By adjusting the depth to which the auxiliary rod 563 is screwed into the threaded hole 5612, the position between the two pressure rollers 562 can be adjusted, allowing both pressure rollers 562 to simultaneously press against the outer wall of the conductor 4. Thus, when the conductor 4 is being conveyed within the housing 51, the friction between the conductor 4 and the pressure rollers 562 causes the pressure rollers 562 to rotate, thereby forming grooves 42 on the surface of the conductor 4. By appropriately setting the number of pressure rollers 562, the number of grooves 42 formed on the surface of the conductor 4 can be controlled. The thickness of the pressure rollers 562 gradually decreases from the axis outwards, meaning that the part of the pressure roller 562 that contacts the conductor 4 is relatively thin and sharp, facilitating the pressing of grooves 42 onto the surface of the conductor 4. When the conductor 4 with grooves 42 on its surface enters the extrusion mechanism 3, the sheath 41 extruded by the extrusion mechanism 3 can penetrate into the grooves 42, thereby reliably improving the adhesion effect of the sheath 41 on the surface of the conductor 4. Moreover, after the conductor 4 is radially brushed by the blowing mechanism 5 and axially brushed by the abrasive mechanism 2, its surface cleanliness is high, which maximizes the injection molding effect of the sheath 41.

[0066] This embodiment also discloses a high-temperature resistant polyvinyl chloride insulated cable.

[0067] Figure 6 This is a reference diagram showing the assembly state of the conductor. See also... Figure 6 A high-temperature resistant polyvinyl chloride (PVC) insulated cable is manufactured using a high-temperature resistant PVC insulated cable production apparatus. It includes an insulating sleeve 6 and multiple conductors 4 passing through the insulating sleeve 6. A sheath 41 is fitted onto the outer wall of each conductor 4, and the sheath 41 is embedded in a groove 42 within the conductor 4. A supporting frame 60 is also provided between the multiple conductors 4. In this configuration, the sheath 41 is firmly attached to the surface of the conductors 4, allowing the conductors 4 to reliably pass through the insulating sleeve 6 and effectively preventing the sheath 41 from breaking or peeling off. Under the action of the supporting frame 60, the multiple conductors 4 within the insulating sleeve 6 are in a separated state, improving the heat dissipation effect between the multiple conductors 4 and thus improving the overall high-temperature resistance of the cable.

[0068] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A production apparatus for high-temperature resistant polyvinyl chloride insulated cables, comprising a feeding mechanism (1), an abrasive mechanism (2), and an extrusion mechanism (3), wherein the feeding mechanism (1) is used to release a single strand of conductor (4), the abrasive mechanism (2) is used to abrade the surface of the conductor (4) axially, and the extrusion mechanism (3) is used to extrude a sheath (41) onto the surface of the conductor (4), characterized in that, It also includes a purging mechanism (5) disposed between the feeding mechanism (1) and the abrasive mechanism (2). The purging mechanism (5) includes a housing (51), an impeller disk (52), and an air distribution disk (53). The outer edge of the impeller disk (52) is connected to the inner wall of the housing (51) by a bearing (54). The outer edge of the air distribution disk (53) is in contact with the inner wall of the housing (51). The air distribution disk (53) and the side wall of the housing (51) are connected. A gas delivery pipe (55) is provided; a first through hole (521) is provided in the middle of the impeller disk (52), a second through hole (531) is provided in the middle of the gas distribution disk (53), a third through hole (511) is provided on the side wall of the housing (51), and the conductor (4) passes through the first through hole (521), the second through hole (531) and the third through hole (511) in sequence. A brush bristle (522) is provided inside the first through hole (521) to wrap the conductor (4). The bottom of the housing (51) is provided with a support leg (512). The housing (51) and the conductor (4) are coaxially arranged. The housing (51) includes a tube (513) with two open ends and a cylindrical part (514) with one open end and one closed end. The tube (513) and the cylindrical part (514) are connected by a flange (515). The outer ring of the bearing (54) is connected to the inner wall of the tube (513). The outer edge of the impeller disk (52) is connected to the inner ring of the bearing (54). The outer edge of the air distribution disk (53) is connected to the inner wall of the cylindrical part (514). The inner diameter of the first perforation (521) is greater than twice the outer diameter of the conductor (4), the inner diameters of the second perforation (531) and the third perforation (511) are the same and both are greater than twice the outer diameter of the conductor (4); a plurality of the bristles (522) extend radially along the impeller disk (52) and all point to the axis of the first perforation (521); The air distribution plate (53) is separated from the side wall of the cylindrical part (514) to form an air cavity. The air distribution plate (53) is provided with a plurality of air distribution holes (532). The air supply pipe (55) is used to supply gas into the air cavity. The gas can pass through the plurality of air distribution holes (532). The flow direction of the gas in the housing (51) is opposite to the release direction of the conductor (4).

2. The high-temperature resistant polyvinyl chloride insulated cable production apparatus according to claim 1, characterized in that, A plurality of pads (516) are provided at intervals along the same circumference on the inner wall of the tube (513), and the plurality of pads (516) clamp the bearing (54), and an air outlet channel (517) is formed between the outer ring of the bearing (54) and the inner wall of the tube (513).

3. The high-temperature resistant polyvinyl chloride insulated cable production apparatus according to claim 2, characterized in that, The density of the air distribution holes (532) gradually decreases from the axis of the second perforation (531) outwards.

4. The high-temperature resistant polyvinyl chloride insulated cable production apparatus according to claim 2, characterized in that, The air distribution plate (53) is provided with at least one pair of embossing components (56) on the side opposite to the impeller plate (52), and the embossing components (56) are used to emboss grooves (42) on the surface of the conductor (4); The indentation assembly (56) includes a main rod (561) and a pressure roller (562). The main rod (561) is fixed to the air distribution plate (53) by a pipe clamp (5611). Each pair of main rods (561) has a threaded hole (5612) on one end face opposite to the other. An auxiliary rod (563) is adapted to be screwed into the threaded hole (5612). The auxiliary rod (563) has a rotating seat (5630) at one end outside the threaded hole (5612). The pressure roller (562) is mounted on the rotating seat (5630) and can rotate around the rotating axis of the rotating seat (5630). The pressure roller (562) presses against the outer wall of the conductor (4).

5. The high-temperature resistant polyvinyl chloride insulated cable production apparatus according to claim 4, characterized in that, The pipe clamp (5611) is provided with a stud (5613), the stud (5613) is inserted into the corresponding air distribution hole (532), and a nut (5614) is adaptedly screwed on the stud (5613). The nut (5614) and the pipe clamp (5611) are respectively located on both sides of the air distribution plate (53).

6. The high-temperature resistant polyvinyl chloride insulated cable production apparatus according to claim 4, characterized in that, The thickness of the pressure roller (562) gradually decreases from the axis to the surrounding area.

7. A high-temperature resistant polyvinyl chloride insulated cable, prepared by the high-temperature resistant polyvinyl chloride insulated cable production apparatus according to claim 4, characterized in that, It includes an insulating sleeve (6) and multiple conductors (4) passing through the insulating sleeve (6). A sheath (41) is provided on the outer wall of the conductor (4). The sheath (41) is embedded in the groove (42) of the conductor (4). A support frame (60) is also provided between the multiple conductors (4).

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