Flexible ptfe insulated wire manufacturing head and processing method

Abstract

The application discloses a machine head for manufacturing soft polytetrafluoroethylene insulated wire and a processing method thereof. The machine head comprises a connecting head in the machine head, a die core is arranged at the top of the connecting head through a die core base, a die sleeve is arranged outside the die core, a center tube is arranged at the bottom center of the connecting head, the machine head comprises two conical bodies with different angles, a bottom conical angle and a top conical angle, the angle of the top conical angle is smaller than that of the bottom conical angle, the wire bearing section of the machine head is horizontal to the die core base, the connecting head comprises two trapezoidal cones with different angles, a bottom conical angle and a top conical angle, the bottom conical angle is the same as the bottom conical angle, and the top conical angle is smaller than the top conical angle, a conductor anti-shaking device is arranged at the bottom of the center tube, the conductor anti-shaking device comprises arc-shaped groove wheels and springs, and the arc-shaped groove wheels are connected through a center rod. The steps are as follows: filling; center tube and die core related component installation; machine head and die sleeve installation; and pushing and extruding. The application can make the insulation layer outside the conductor more compact, and avoid the bending phenomenon of the conductor during processing.

Description

Technical Field

[0001] This invention relates to the field of wire manufacturing technology, specifically to a machine head for manufacturing flexible polytetrafluoroethylene insulated wires and its processing method. Background Technology

[0002] Extruded PTFE insulated wires and cables are a class of cables with excellent high-temperature resistance, excellent chemical resistance, moisture resistance, and non-flammability, meeting the requirements for salt spray, mold, and moisture resistance. This product can meet the harsh environments of aerospace, aviation, shipborne, electronics, and armored vehicle fields for information and energy transmission. It is mainly used for internal wiring of electrical equipment and instruments at 600V and below, as well as aircraft wiring, and is particularly suitable for ground testing system wiring. Conventional extruded PTFE insulated wires and cables use a regular stranded conductor structure (such as 19 / 0.10), with tightly stranded conductors. Due to this structure, the wire's flexibility is relatively poor, leading to limitations in installation, especially for larger wires. Conventional wrapped PTFE insulated wires use bundled conductors (such as 30 / 0.08), with loose stranding. Although flexible, the surface is uneven due to the wrapping and overlapping, resulting in relatively poor abrasion resistance and moisture resistance, thus limiting their use.

[0003] Compared to conventional stranded conductor extruded insulation wires, bundled conductor PTFE extrusion improves wire flexibility, reduces bending radius, and facilitates wire laying. Furthermore, compared to conventional PTFE wrapped insulation wires, extruded insulation improves surface smoothness and enhances abrasion and moisture resistance. However, bundled conductors, due to their looser structure, are prone to deformation and arching under stress, making PTFE extrusion insulation processing impossible with current technology.

[0004] In the publicly available document CN111180141A, "A Preforming and Extrusion Integrated Machine and Its Processing Method," which is also a method for forming wires, the extruded insulating material from the die head is straight. This can easily cause the conductor structure to become loose during the extrusion of the insulating material, making it prone to deformation and arching under stress, which is not conducive to later use and reduces the service life of the conductor. Summary of the Invention

[0005] To address the aforementioned problems, this invention discloses a machine head for manufacturing flexible polytetrafluoroethylene insulated wires and its processing method, which enables the insulation layer on the outside of the conductor to be more compact and avoids bending of the conductor during processing.

[0006] The technical solution of the present invention is as follows: a machine head for manufacturing flexible polytetrafluoroethylene insulated wires, including a connector located inside the machine head, a mold core is provided on the top of the connector head through a mold core base, a mold sleeve is provided outside the mold core, a central tube is provided at the center of the bottom of the connector head, the machine head includes two cones with different angles, a bottom cone angle and a top cone angle, the angle of the top cone angle is smaller than that of the bottom cone angle, the wire-bearing section of the machine head is horizontal with the mold core base, the connector includes two trapezoidal cones with different angles, a bottom cone angle and a top cone angle, the bottom cone angle and the bottom cone angle have the same angle, the top cone angle is smaller than that of the top cone angle, a conductor anti-sway device is provided at the bottom of the central tube, the conductor anti-sway device includes an arc-shaped groove wheel and a spring, the arc-shaped groove wheels are connected by a central rod, and the central rod is connected to the side wall of the central tube.

[0007] Furthermore, the arc groove on the arc groove wheel is "V" shaped, that is, wider at the top and narrower at the bottom. The arc groove wheel includes an upper arc groove wheel and a lower arc groove wheel. The center of the upper arc groove wheel and the lower arc groove wheel are connected laterally to the side wall of the central tube by a spring. The center of the arc groove wheels is connected to the two ends of the central rod by a bearing. The middle part of the central rod is connected to the side wall of the central tube by a fixing rod.

[0008] Furthermore, the upper arc-shaped grooved wheel is located above the lower arc-shaped grooved wheel on one side. The opposite sides of the upper and lower arc-shaped grooved wheels are on the same vertical line. The upper arc-shaped grooved wheel, the lower arc-shaped grooved wheel, and the spring form a "Z" shape. A conductor passes between the upper and lower arc-shaped grooved wheels. The conductor passes exactly through the connection point of the center rod and the fixed rod. When there is no conductor passing through the spring, it is in a natural state. When there is a conductor passing through, it is in a tensioned state due to the influence of the conductor.

[0009] Furthermore, a mold sleeve is provided between the mold sleeve groove at the top of the machine head and the mold core. A wire support section is provided between the bottom of the mold sleeve groove and the conical structure inside the machine head. The wire support section is a cylindrical hole with a length of 10mm to 40mm, which is the same as the mold core base. A mold sleeve locking cover is provided at the top of the machine head and the mold sleeve. A material cylinder is connected to the bottom of the machine head through the machine head clamp. The inner diameter of the material cylinder is 90mm to 110mm, and a piston is provided inside the material cylinder.

[0010] Furthermore, the bottom cone angle of the machine head is 35° to 45°, the top cone angle is 5° to 15°, the top cone angle of the connector is 3° to 7° smaller than the top cone angle of the machine head, the internal thread at the bottom of the connector is connected to the external thread at the top of the central tube, the outer diameter of the central tube is 50mm to 70mm, and the central tube has a hollow structure.

[0011] Furthermore, the mold core base consists of two detachable, vertically divided semi-cylinders connected to each other by a locating pin. Both ends of the mold core base have threads, with the bottom external thread connecting to the top internal thread of the connector and the top external thread connecting to the mold core. The outer diameter of the mold core base is the same as the outer diameter of the top of the connector. The bottom and top circular holes of the mold core base are connected by an arc. The distance between the mold core base and the inner wall of the machine head is 3mm to 7mm.

[0012] Furthermore, the mold core is composed of two halves joined together, with an internal through groove, that is, the through groove of the mold core is composed of the grooves of the two halves. The mold core is generally conical, with an internal thread at the bottom for connection with the mold core base. The outer diameter of the bottom is the same as the outer diameter of the mold core base. The outer diameter of the top matches the outer diameter of the conductor and is 0.1mm to 0.2mm larger than the outer diameter of the conductor. The cone angle of the mold core is 1° to 3° smaller than the inner cone angle of the mold sleeve.

[0013] Furthermore, inside the die sleeve, the bottom is conical with a cone angle of 15° to 20°, and the top is cylindrical, i.e., the sizing section. The diameter of the sizing section matches the outer diameter of the conductor, and the length is 5mm to 15mm. The distance between the bottom of the sizing section and the top of the die core, i.e., the inner die sleeve gap, is 1mm to 3mm. The diameter of the top hole of the die sleeve matches the outer diameter of the conductor extrusion and is 0.03 to 0.1mm smaller than the outer diameter of the conductor extrusion.

[0014] Furthermore, the horizontal direction of the machine head clamp is a ring composed of three arc segments, with each arc segment connected by a snap fastener. The vertical cross-section of each arc is a "C" shaped structure, and the internal dimensions match the external dimensions of the bottom of the machine head and the top of the barrel.

[0015] The processing method using a machine head for manufacturing flexible polytetrafluoroethylene insulated wires includes the following steps:

[0016] Step 1: Filling: Retract the piston to the bottom of the barrel and put the insulating material into the barrel;

[0017] Step 2: Installation of the central tube and related components of the mold core: Insert the conductor into the bottom of the central tube, pass through the middle of the conductor anti-sway device, that is, pass through the middle of the upper arc groove wheel and the lower arc groove wheel, and exit at the top of the central tube. After the conductor exits, first pass it through the connector, and then tighten the connector on the central tube. Next, place the conductor in the groove of one half of the mold core base, and then close the other half of the mold core base. After ensuring that the conductor can move in the mold core base, tighten the mold core base on the connector. Finally, after the conductor passes through the mold core, tighten the mold core on the mold core base. Adjust the position of the mold core by moving the central tube up and down until the gap of the inner mold sleeve reaches the required value.

[0018] Step 3: Installation of the die head and die sleeve: After the conductor passes through the center of the die head, place the die head and the barrel in the same position. Then, use the die head clamp to lock the die head and the barrel. Pass the conductor through the die sleeve and place the die sleeve in the die sleeve groove on the die head. Use the die sleeve locking cover to lock the die sleeve.

[0019] Step 4: Extrusion: The piston uses mechanical or hydraulic force to extrude the insulating material from the die hole, thereby extruding the insulating material onto the conductor.

[0020] The advantages of this invention are as follows: 1. The machine head of this invention includes two cones with different angles. Under the condition of constant thrust, the larger the angle of the machine head, the greater the component force in the direction perpendicular to the conductor. The large-angle cone part has a larger component force in the direction perpendicular to the conductor because of its large angle, which can quickly compact the insulating material and shorten the overall length of the machine head. The small-angle cone part has a smaller angle, which has a larger component force in the direction perpendicular to the conductor, which can reduce the pressure on the central tube and the mold core.

[0021] 2. In this invention, the head bearing wire is horizontal with the mold core base. At this time, the thrust direction is horizontal with the conductor, and the thrust component pointing vertically to the conductor is 0. Only the force generated by the expansion of the insulating material is in the vertical direction, which further reduces the force in the direction perpendicular to the conductor.

[0022] 3. The ratio of the annular cross-sectional area between the barrel and the central rod to the annular cross-sectional area between the top of the die and the conductor, i.e., the insulation material compression ratio, is such that the larger this ratio is, the greater the initial thrust N pushing the insulation material, and correspondingly, the greater the final force on the conductor, making the conductor more prone to deformation. By increasing the outer diameter of the central rod, the compression ratio is reduced, thereby reducing the initial thrust N. By setting a bearing segment, the insulation material moves parallel in the bearing segment and is compressed again after entering the die. Using the segmented compression method of the insulation material further reduces the pressure on the conductor.

[0023] 4. The conductor anti-sway device inside the central tube and the arc-shaped structure inside the mold core base of the present invention, the upper arc-shaped groove wheel and the lower arc-shaped groove wheel and the central rod enable the conductor passing through to avoid conductor deformation and loosening caused by conductor swaying. The above-mentioned device realizes the pushing insulation processing of stranded conductors. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the conductor anti-sway device of the present invention;

[0026] Figure 3 This is a schematic diagram of the forces acting on the head of the machine in this invention;

[0027] Figure 4 For the present invention Figure 1 A structural schematic diagram of enlarged view of part A in the middle;

[0028] The components are: 0. Conductor, 1. Barrel, 2. Machine head, 21. Machine head clamp, 22. Mold sleeve groove, 3. Center tube, 31. Conductor anti-sway device, 311. Upper arc-shaped grooved wheel, 312. Lower arc-shaped grooved wheel, 313. Spring, 314. Center rod, 315. Fixing rod, 32. Connector, 4. Mold core, 41. Mold core base, 42. Wire bearing section, 5. Mold sleeve, 51. Mold sleeve locking cover, 52. Sizing section, 6. Piston. Detailed Implementation

[0029] To enhance understanding of the present invention, specific embodiments are described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and do not constitute a limitation on the scope of protection of the present invention.

[0030] like Figure 1-4 As shown, a machine head for manufacturing flexible polytetrafluoroethylene insulated wires includes a connector 32 located inside the machine head 2. A mold core 4 is provided on the top of the connector 32 via a mold core base 41. A mold sleeve 5 is provided outside the mold core 4. A central tube 3 is provided at the center of the bottom of the connector 32. The machine head 2 includes two cones with different angles, a bottom cone angle and a top cone angle. The angle of the top cone angle is smaller than that of the bottom cone angle. The wire-bearing section of the machine head 2 is horizontal with the mold core base 41. The connector 32 includes two trapezoidal cones with different angles, a bottom cone angle and a top cone angle. The bottom cone angle and the bottom cone angle have the same angle, and the top cone angle is smaller than that of the top cone angle. A conductor anti-sway device 31 is provided at the bottom of the central tube 3. The conductor anti-sway device 31 includes an arc-shaped grooved wheel and a spring 313. The arc-shaped grooved wheels are connected by a central rod 314. The central rod 314 is connected to the side wall of the central tube 3.

[0031] The arc groove on the arc groove wheel is "V" shaped, that is, wider at the top and narrower at the bottom. The arc groove wheel includes an upper arc groove wheel 311 and a lower arc groove wheel 312. The center of the upper arc groove wheel 311 and the lower arc groove wheel 312 are connected laterally to the side wall of the central tube 3 by a spring 313. The center of the arc groove wheels is connected to the two ends of the central rod 314 by a bearing. The middle part of the central rod 314 is connected to the side wall of the central tube 3 by a fixing rod 314.

[0032] The upper arc-shaped grooved wheel 311 is located above the lower arc-shaped grooved wheel 312. The opposite sides of the upper arc-shaped grooved wheel 311 and the lower arc-shaped grooved wheel 312 are on the same vertical line. The upper arc-shaped grooved wheel 311, the lower arc-shaped grooved wheel 312 and the spring 313 form a "Z" shape. A conductor 0 passes between the upper arc-shaped grooved wheel 311 and the lower arc-shaped grooved wheel 312. The conductor 0 passes exactly through the connection point of the center rod 314 and the fixed rod 315. When the spring 313 does not have the conductor 0 passing through it, it is in a natural state. When the conductor 0 passes through it, it is in a tensioned state due to the influence of the conductor 0.

[0033] A mold sleeve 5 is provided between the mold sleeve groove 22 at the top of the machine head 2 and the mold core 4. A wire support section 42 is provided between the bottom of the mold sleeve groove 22 and the conical structure inside the machine head 2. The wire support section 42 of the machine head 2 is horizontal with the mold core base 41. The wire support section 42 is a cylindrical hole. The wire support section 42 has a thrust N3 parallel to the conductor 0. The length of the wire support section is the same as that of the mold core base 41, which is 10mm to 40mm. A mold sleeve locking cover 51 is provided at the top of the machine head 2 and the mold sleeve 5. A material cylinder 1 is connected to the bottom of the machine head 2 through the machine head clamp 21. The inner diameter of the material cylinder 1 is 90mm to 110mm. A piston 6 is provided inside the material cylinder 1. The ratio of the cross-sectional area of ​​the annulus between the material cylinder 1 and the center rod 314 to the cross-sectional area of ​​the annulus between the top of the mold sleeve 5 and the conductor is the insulation material compression ratio. The larger this ratio is, the larger the initial thrust N of pushing the insulation material is. Correspondingly, the greater the final force on the conductor 0 is, and the easier it is for the conductor 0 to deform. By increasing the outer diameter of the center rod 314, the compression ratio is reduced, thereby reducing the initial thrust N; by setting up a bearing section, the insulating material moves parallel during the bearing section, and is compressed again after entering the mold sleeve 5. The method of segmented compression of the insulating material is used to further reduce the pressure on the conductor 0.

[0034] The bottom cone angle of the die head 2 is 35°~45°, and the top cone angle is 5°~15°. The top cone angle of the connector 32 is 3°~7° smaller than the top cone angle of the die head. The internal thread at the bottom of the connector 32 connects with the external thread at the top of the central tube 3. The outer diameter of the central tube 3 is 50mm~70mm, and the central tube 3 has a hollow structure. The cone angle of the die head 2 converts the initial thrust parallel to the conductor 0 in the barrel 1 into a thrust N parallel to the conductor 0 in the bottom cone angle portion. 1Y and the thrust N perpendicular to conductor O 1X This is then converted into a thrust N parallel to the conductor at the top cone angle. 2Y and the thrust N perpendicular to the conductor 2X The thrust parallel to conductor 0 moves the insulating material forward, while the force perpendicular to conductor 0 compacts it. For machine heads with uniform cone angles, a smaller cone angle results in a smaller component of force perpendicular to conductor 0, leading to less pressure on conductor 0, but hindering compaction and potentially causing electrical breakdown. Additionally, machine head 2 is longer. A larger cone angle results in a larger component of force perpendicular to conductor 0, compacting the insulating material, but significantly impacting conductor 0, causing deformation and affecting normal production. The large-angle cone section of this angle-changing machine head 2, due to its large angle, generates a larger component of force perpendicular to the conductor, allowing for rapid compaction of the insulating material and shortening the overall length of machine head 2. The small-angle cone section, due to its small angle, generates a smaller component of force perpendicular to conductor 0, reducing the final pressure on conductor 0. A schematic diagram of the internal forces of machine head 2 is shown below. Figure 3 .

[0035] The mold core base 41 consists of two detachable, vertically divided semi-cylinders connected to each other by a positioning pin. Both ends of the mold core base 41 are threaded. The bottom external thread is connected to the top internal thread of the connector, and the top external thread is connected to the mold core. The outer diameter of the mold core base 41 is the same as the top outer diameter of the connector 32. The bottom circular hole and the top circular hole of the mold core base 41 are connected by an arc. The distance between the mold core base 41 and the inner wall of the machine head 2 is 3mm to 7mm.

[0036] The mold core 4 is composed of two halves joined together, and has a through groove inside. That is, the through groove of the mold core is composed of the grooves of the two halves. The mold core 4 is generally conical, with an internal thread at the bottom for connecting with the mold core base 41. The outer diameter of the bottom is the same as the outer diameter of the mold core base. The outer diameter of the bottom of the mold core 4 is the same as the outer diameter of the mold core base 41. The outer diameter of the top matches the outer diameter of the conductor 0 and is 0.1mm to 0.2mm larger than the outer diameter of the conductor 0. The cone angle of the mold core 4 is 1° to 3° smaller than the inner cone angle of the mold sleeve 5.

[0037] Inside the mold sleeve 5, the bottom is conical with a cone angle of 15° to 20°, and the cone angle portion has a thrust N parallel to the conductor. 4Y and the thrust N perpendicular to the conductor 4X The top is cylindrical, i.e., the sizing section. The diameter of the sizing section 52 matches the outer diameter of the conductor, and the length is 5mm to 15mm. The sizing section 52 has a thrust N5 parallel to the conductor. The distance between the bottom of the sizing section 52 and the top of the mold core 4, i.e. the inner mold sleeve gap, is 1mm to 3mm. The top diameter of the mold sleeve matches the extruded outer diameter of the conductor 0, and is 0.03 to 0.1mm smaller than the extruded outer diameter of the conductor 0.

[0038] The machine head clamp 21 is a ring composed of three arc segments in the horizontal direction. Each arc segment is connected by a snap fastener. The vertical cross section of each arc is a "C" shaped structure. The internal dimensions match the external dimensions of the bottom of the machine head 2 and the top of the material cylinder 1.

[0039] The processing method using a machine head for manufacturing flexible polytetrafluoroethylene insulated wires includes the following steps:

[0040] Step 1: Filling: Retract piston 6 to the bottom of barrel 1 and put insulating material into barrel 1;

[0041] Step 2: Installation of central tube 314 and related components of mold core 4: Insert conductor 0 from the bottom of central tube 3, pass through the middle of conductor anti-sway device 31, that is, pass through the middle of upper arc groove wheel 311 and lower arc groove wheel 312, and exit from the top of central tube 3. After conductor 0 exits, first pass through connector 32, and then tighten connector 32 on central tube 3. Next, place conductor 0 in the groove of one half of mold core base 41, and then close the other half of mold core base 41. After ensuring that conductor 0 can move in mold core base 41, tighten mold core base 41 on connector 32. Finally, after conductor 0 passes through mold core 4, tighten mold core 4 on mold core base 41. Adjust the position of mold core 4 by moving central tube 3 up and down until the inner mold sleeve gap reaches the required value.

[0042] Step 3: Installation of head 2 and die sleeve 5: After conductor 0 passes through the center of head 2, place head 2 and cylinder 1 in corresponding positions. Then, use head clamp 21 to lock head 2 and cylinder 1. Pass conductor 0 through die sleeve 5. Place die sleeve 5 in die sleeve groove 22 on head 2. Use die sleeve locking cover 51 to lock die sleeve 5.

[0043] Step 4: Extrusion: The piston 6 uses mechanical or hydraulic force to extrude the insulating material from the die hole (the hole inside the die for extruding the insulating material, which is a conventional structure), thereby extruding the insulating material onto the conductor 0.

Claims

1. A machine head for manufacturing flexible polytetrafluoroethylene insulated wires, comprising a connector located inside the machine head, a mold core being provided on the top of the connector via a mold core base, a mold sleeve being provided outside the mold core, and a central tube being provided at the center of the bottom of the connector, characterized in that: The machine head includes two cones with different angles: a bottom cone angle and a top cone angle. The angle of the top cone angle is smaller than that of the bottom cone angle. The machine head's support section is horizontal to the mold core base. The connector includes two trapezoidal cones with different angles: a bottom cone angle and a top cone angle. The bottom cone angle and the bottom cone angle have the same angle, while the top cone angle is smaller than that of the top cone angle. The bottom of the central tube is equipped with a conductor anti-sway device, which includes an arc-shaped grooved wheel and a spring. The arc-shaped grooved wheels are connected by a central rod, which is connected to the side wall of the central tube. The arc grooves on the arc-shaped grooved wheels are "V"-shaped, i.e., wider at the top and narrower at the bottom. The arc-shaped grooved wheel includes an upper arc-shaped grooved wheel and a lower arc-shaped grooved wheel. The center of the upper arc-shaped grooved wheel is connected to the side wall of the central tube by a spring laterally. The centers of the arc-shaped grooved wheels are connected by bearings and the two ends of the central rod. The middle part of the central rod is connected to the side wall of the central tube by a fixed rod. The upper arc-shaped grooved wheel is located above the lower arc-shaped grooved wheel. The opposite sides of the upper and lower arc-shaped grooved wheels are on the same vertical line. The upper arc-shaped grooved wheel, the lower arc-shaped grooved wheel, and the spring form a "Z" shape. A conductor passes between the upper and lower arc-shaped grooved wheels. The conductor passes exactly through the connection point of the central rod and the fixed rod. When no conductor passes through the spring, it is in a natural state. When a conductor passes through the spring, it is in a tensioned state due to the influence of the conductor.

2. The machine head for manufacturing flexible polytetrafluoroethylene insulated wires according to claim 1, characterized in that: A mold sleeve is provided between the mold sleeve groove at the top of the machine head and the mold core. A support section is provided between the bottom of the mold sleeve groove and the conical structure inside the machine head. The support section is a cylindrical hole with a length of 10mm to 40mm, which is the same as the mold core base. A mold sleeve locking cover is provided at the top of the machine head and the mold sleeve. A material cylinder is connected to the bottom of the machine head through a machine head clamp. The inner diameter of the material cylinder is 90mm to 110mm, and a piston is provided inside the material cylinder.

3. The machine head for manufacturing flexible polytetrafluoroethylene insulated wires according to claim 1, characterized in that: The bottom cone angle of the machine head is 35° to 45°, and the top cone angle is 5° to 15°. The top cone angle of the connector is 3° to 7° smaller than the top cone angle of the machine head. The internal thread at the bottom of the connector is connected to the external thread at the top of the central tube. The outer diameter of the central tube is 50mm to 70mm, and the central tube has a hollow structure.

4. The machine head for manufacturing flexible polytetrafluoroethylene insulated wires according to claim 1, characterized in that: The mold core base consists of two detachable, vertically divided semi-cylinders connected to each other by a positioning pin. Both ends of the mold core base are threaded. The bottom external thread connects to the top internal thread of the connector, and the top external thread connects to the mold core. The outer diameter of the mold core base is the same as the top outer diameter of the connector. The bottom and top circular holes of the mold core base are connected by an arc. The distance between the mold core base and the inner wall of the machine head is 3mm to 7mm.

5. The machine head for manufacturing flexible polytetrafluoroethylene insulated wires according to claim 1, characterized in that: The mold core is composed of two halves joined together, and has a through groove inside, that is, the through groove of the mold core is composed of the grooves of the two halves. The mold core is generally conical, with internal threads at the bottom for connection with the mold core base. The outer diameter of the bottom is the same as the outer diameter of the mold core base. The outer diameter of the top matches the outer diameter of the conductor and is 0.1mm to 0.2mm larger than the outer diameter of the conductor. The cone angle of the mold core is 1° to 3° smaller than the inner cone angle of the mold sleeve.

6. The machine head for manufacturing flexible polytetrafluoroethylene insulated wires according to claim 1, characterized in that: The bottom of the die sleeve is conical with a cone angle of 15° to 20°, and the top is cylindrical, i.e., the sizing section. The diameter of the sizing section matches the outer diameter of the conductor, and the length is 5mm to 15mm. The distance between the bottom of the sizing section and the top of the die core, i.e., the inner die sleeve gap, is 1mm to 3mm. The top diameter of the die sleeve matches the outer diameter of the conductor extrusion and is 0.03 to 0.1mm smaller than the outer diameter of the conductor extrusion.

7. The machine head for manufacturing flexible polytetrafluoroethylene insulated wires according to claim 1, characterized in that: The machine head clamp is a ring composed of three arc segments in the horizontal direction. Each arc segment is connected by a snap fastener. The vertical cross section of each arc is a "C" shaped structure, and the internal dimensions match the external dimensions of the bottom of the machine head and the top of the barrel.

8. The processing method of the machine head for manufacturing flexible polytetrafluoroethylene insulated wires as described in claim 1, characterized in that, Includes the following steps: Step 1: Filling: Retract the piston to the bottom of the barrel and put the insulating material into the barrel; Step 2: Installation of the central tube and related components of the mold core: Insert the conductor into the bottom of the central tube, pass through the middle of the conductor anti-sway device, that is, pass through the middle of the upper arc groove wheel and the lower arc groove wheel, and exit at the top of the central tube. After the conductor exits, first pass it through the connector, and then tighten the connector on the central tube. Next, place the conductor in the groove of one half of the mold core base, and then close the other half of the mold core base. After ensuring that the conductor can move in the mold core base, tighten the mold core base on the connector. Finally, after the conductor passes through the mold core, tighten the mold core on the mold core base. Adjust the position of the mold core by moving the central tube up and down until the gap of the inner mold sleeve reaches the required value. Step 3: Installation of the die head and die sleeve: After the conductor passes through the center of the die head, place the die head and the barrel in the same position. Then, use the die head clamp to lock the die head and the barrel. Pass the conductor through the die sleeve and place the die sleeve in the die sleeve groove on the die head. Use the die sleeve locking cover to lock the die sleeve. Step 4: Extrusion: The piston uses mechanical or hydraulic force to extrude the insulating material from the die hole, thereby extruding the insulating material onto the conductor.

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