Flame-retardant control cable and preparation method thereof

Abstract

The application belongs to the technical field of cable preparation, and particularly relates to a flame-retardant control cable and a preparation method. After the coating layer leaves the extrusion port, the coating layer is not in a completely cooled state, so that the coating layer may be deformed to a certain extent, and then the quality of the control cable is affected. The following scheme is proposed, which comprises: a plurality of conductor bodies, the outer part of each of the plurality of conductor bodies is provided with an insulating outer layer, and the outer part of each of the plurality of insulating outer layers is provided with a filling layer; an inner lining body is arranged on the outer wall of the filling layer, the outer wall of the inner lining body is provided with a steel tape armor, and the outer wall of the steel tape armor is provided with a flame-retardant sheath. The flame-retardant control cable and the preparation method disclosed by the application have the effect of improving the core coating forming quality of the cable. After the cable core coating leaves the extrusion port, the device can support the sheath layer, so that the sinking deformation of the coating layer can be avoided when the coating layer has not reached the cooling area, and the use effect of the device is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of cable preparation, and in particular to a flame-retardant control cable and a preparation method thereof. Background Art

[0002] Flame-retardant control cables are cables designed to prevent or slow the spread of flames in fire conditions. They are primarily used to transmit control signals, measurement signals, operating instructions, and low-voltage electrical energy (usually 450 / 750V and below).

[0003] Its core lies in its "flame retardant" property, that is, after the cable itself or an external fire source ignites, the flame can extinguish itself within a limited range, preventing the flame from spreading rapidly along the cable path, thereby buying valuable time for personnel evacuation, equipment shutdown and fire rescue.

[0004] Existing control cables need to be coated with a flame-retardant outer layer during preparation. However, when the coating layer leaves the extrusion outlet, it is not in a completely cooled state, so the coating layer may sink and deform to a certain extent, thereby affecting the quality of the finished product of the control cable after cooling. Summary of the Invention

[0005] The present invention discloses a flame-retardant control cable and a preparation method thereof, aiming to solve the technical problem in the background technology that the coating layer is not in a completely cooled state after leaving the extrusion outlet, so the coating layer may sink and deform to a certain extent, thereby affecting the quality of the control cable.

[0006] The present invention provides a flame-retardant control cable comprising:

[0007] A plurality of conductor bodies, each of which is provided with an insulating outer layer, and each of which is provided with a filling layer;

[0008] The inner lining body is arranged on the outer wall of the filling layer, the outer wall of the inner lining body is provided with steel belt armor, and the outer wall of the steel belt armor is provided with a flame retardant sheath.

[0009] A method for preparing a cable, for preparing the flame-retardant control cable as described above, comprising the following steps:

[0010] S1. Stranded conductor: Stranded conductors must be smooth and free of burrs, broken wires, and loose strands. Single wires with a diameter greater than 0.2mm must be welded, with joint spacing ≥300mm. The strands must be tightly and evenly twisted, and loose strands are prohibited.

[0011] S2. Insulation extrusion: The insulation tightly covers the conductor, and the surface is smooth without burnt particles;

[0012] S3, the cabling process: the core is arranged in the clockwise direction according to the numerical order, the pitch control: the hard conductor is less than 20 times the outer diameter of the core, the soft conductor is less than 16 times the outer diameter, the outermost layer of the cabling is right twisted, and the adjacent layers are twisted in opposite directions;

[0013] S4, metal shielding: when the copper tape, copper plastic tape and aluminum plastic tape are used for wrapping shielding, the overlapping rate is not less than 15%, when the copper plastic tape and aluminum plastic tape are wrapped, the metal surface should face inwards, and in addition, a 7 / 0.2mm annealed bare copper wire is added as a drainage wire in the following longitudinal direction;

[0014] S5, inner lining layer: the inner lining layer can be wrapped or wrapped, the thinnest point of the extruded inner lining layer is not less than 80% of the nominal thickness, and the average value of the wrapped inner lining layer is not less than 80% of the nominal thickness;

[0015] S6, armor: the steel tape wrapping should be flat, tight, without horn, loose, folded edge, gap, exposed bottom, etc., and the folded, rough, uneven and unqualified steel tape is strictly prohibited, the steel tape joint must be welded, the joint overlap should be between 5-10mm, the joint should be close to 45°, and the joint should be firm, repaired flat, without burning, burr, corner and other defects;

[0016] S7, sheath extrusion: the sheath is extruded on the twisted insulated core, oxygen barrier layer or metal armored layer through the cable core coating forming device, and it is easy to peel off without damaging the insulation layer.

[0017] In one preferred scheme, the cable core coating forming device comprises:

[0018] A preparation base is prepared, a fixed support is arranged on the preparation base, and an extruder body is arranged on the fixed support;

[0019] An installation base is arranged on the preparation base, and a cooling guide groove is arranged on the installation base;

[0020] Three coating guide rollers are arranged on the installation base, and two cross plates are arranged on the installation base;

[0021] A coating sink unit is arranged on the two cross plates, and the coating sink unit is used to provide an upward force to the sheath layer to avoid sinking deformation when the coating layer does not reach the cooling area;

[0022] A coating cleaning module is arranged on the extruder body, and the coating cleaning module is used to clean the outer surface of the cable before coating.

[0023] In one preferred scheme, the coating sink unit comprises:

[0024] Two installation rods, two installation rods are arranged on two horizontal plates, the outer wall of two installation rods is fixedly connected with gear parts, two gear parts are engaged;

[0025] A drive motor is arranged on one side of the outer wall of one of the horizontal plates, and the output shaft of the drive motor is connected to one end of one of the installation rods through a shaft coupling;

[0026] Four connecting brackets are arranged on the outer walls of the two installation rods.

[0027] In a preferred embodiment, the cladding sink unit further comprises:

[0028] Four guide belt frames are arranged on one side of the outer wall of each of the four connecting brackets, two shaft rods are arranged on each of the four guide belt frames, and the outer walls of the shaft rods are respectively provided with guide wheels one and guide wheels two;

[0029] Four fixed plates are arranged on each of the four guide belt frames, two installation shafts are arranged on each of the four fixed plates, and the outer walls of the installation shafts are provided with winding wheels.

[0030] In a preferred embodiment, the cladding sink unit further comprises:

[0031] Four sink belts are arranged on the winding wheels, and the outer walls of the four sink belts are respectively in contact with the inner walls of the four guide wheels one and the four guide wheels two;

[0032] Four movable openings are respectively arranged on the four guide belt frames, connecting pieces are arranged on the four sink belts, and the four connecting pieces are respectively located inside the four movable openings.

[0033] In a preferred embodiment, the cladding sink unit further comprises:

[0034] Four servo motors are arranged on one side of the outer wall of each of the four fixed plates, and the output shafts of the four servo motors are respectively connected to one end of four installation shafts through shaft couplings;

[0035] A plurality of linkage wheels are arranged on the other end of the installation shafts, and each two adjacent linkage wheels are provided with the same linkage belt;

[0036] Two sink rollers are arranged on the four connecting pieces.

[0037] In a preferred embodiment, the cladding cleaning module comprises:

[0038] A universal motor is provided on an outer wall of the extruder body, and an output shaft of the universal motor is connected to a driving gear via a coupling;

[0039] The annular rail is arranged on the extruder body, and a rotating ring frame is arranged on the inner wall of the annular rail.

[0040] In a preferred embodiment, the coating and cleaning module further comprises:

[0041] A gear ring, which is arranged on an outer wall of one side of the rotating ring frame and meshes with the driving gear;

[0042] Three negative pressure chambers, all of which are arranged on the outer wall of the other side of the rotating ring frame, and the outer walls of one side of the three negative pressure chambers are provided with threaded joints;

[0043] The three connecting chambers are respectively arranged on the three negative pressure chambers, and dust filter bags are arranged inside the three connecting chambers.

[0044] In a preferred embodiment, the coating and cleaning module further comprises:

[0045] Three negative pressure pumps, which are respectively arranged on three connecting compartments;

[0046] Three elastic brush plates are respectively arranged on the outer walls of the three negative pressure bins, and a plurality of cleaning suction cups are arranged on the three negative pressure bins.

[0047] From the above, it can be seen that the flame-retardant control cable and preparation method provided by the present invention have the function that after the cable core coating leaves the extrusion outlet, the device can lift its sheath layer to prevent the coating layer from sinking and deforming before reaching the cooling area, thereby increasing the use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a structural schematic diagram of a flame-retardant control cable proposed by the present invention;

[0049] Figure 2 This is a schematic diagram of the overall structure of a cable preparation method proposed by the present invention;

[0050] Figure 3 This is a schematic diagram of the combined structure of a fixed bracket and an extruder body in a cable preparation method proposed by the present invention;

[0051] Figure 4 This is a schematic diagram of the combined structure of a transverse plate and an installation base in a cable preparation method proposed by the present invention;

[0052] Figure 5 This is a schematic structural diagram of a coating and supporting unit of a cable preparation method proposed in the present invention;

[0053] Figure 6 This is a schematic diagram of the combined structure of a connection bracket and a guide belt frame of a cable preparation method proposed by the present invention;

[0054] Figure 7 This is a schematic structural diagram of a coating cleaning module of a cable preparation method proposed in the present invention;

[0055] Figure 8 This is a schematic diagram of the disassembled structure of the connection chamber and threaded joint of a cable preparation method proposed in the present invention.

[0056] In the figure: 1. Flame retardant sheath; 2. Steel tape armor; 3. Liner body; 4. Insulation outer layer; 5. Conductor body; 6. Filling layer; 7. Preparation base; 8. Mounting base; 9. Cooling guide trough; 10. Extruder body; 11. Fixed bracket; 12. Coating cleaning module; 1201. Gear ring; 1202. Rotating ring frame; 1203. Elastic brush plate; 1204. Driving gear; 1205. Universal motor; 1206. Ring rail; 1207. Negative pressure chamber; 1208. Threaded joint; 1209. Dust filter bag; 1210. Negative pressure pump; 1211. Connection chamber; 121 2. Clean the suction cup; 13. Cover the guide roller; 14. Cover the supporting unit; 1401. Gear part; 1402. Mounting rod; 1403. Winding wheel; 1404. Support belt; 1405. Guide wheel one; 1406. Support roller; 1407. Guide wheel two; 1408. Linkage belt; 1409. Linkage wheel; 1410. Shaft rod; 1411. Servo motor; 1412. Fixed plate; 1413. Mounting shaft; 1414. Drive motor; 1415. Connecting bracket; 1416. Guide belt frame; 1417. Movable opening; 1418. Connecting part; 15. Horizontal plate. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0058] The flame-retardant control cable and preparation method disclosed in the present invention are mainly used in scenarios where the coating layer is not in a completely cooled state after leaving the extrusion outlet, so the coating layer may sink and deform to a certain extent, thereby affecting the quality of the control cable.

[0059] Reference Figure 1 , a flame retardant control cable, comprising:

[0060] A plurality of conductor bodies 5, each of which is provided with an insulating outer layer 4 on its exterior, and each of which is provided with a filling layer 6 on its exterior;

[0061] The inner lining body 3 is arranged on the outer wall of the filling layer 6 , the outer wall of the inner lining body 3 is provided with a steel belt armor 2 , and the outer wall of the steel belt armor 2 is provided with a flame retardant sheath 1 .

[0062] A method for preparing a flame-retardant control cable as described above comprises the following steps:

[0063] S1. Stranded conductor: Stranded conductors must be smooth and free of burrs, broken wires, and loose strands. Single wires with a diameter greater than 0.2mm must be welded, with joint spacing ≥300mm. The strands must be tightly and evenly twisted, and loose strands are prohibited.

[0064] S2. Insulation extrusion: The insulation tightly covers the conductor, and the surface is smooth without burnt particles;

[0065] S3. Cabling process: The cores are arranged clockwise in numerical order. Pitch control: Hard conductors ≤ 20 times the core outer diameter, soft conductors ≤ 16 times the outer diameter. The outermost layer of the cable is right-hand twisted, and adjacent layers are twisted in opposite directions.

[0066] S4. Metal shielding: When using copper tape, copper-plastic tape, or aluminum-plastic tape for shielding, the overlap rate should be no less than 15%. When wrapping the copper-plastic tape or aluminum-plastic tape, the metal surface should face inward. In addition, a 7 / 0.2mm annealed bare copper wire should be added longitudinally underneath as a drain wire.

[0067] S5. Inner lining: The inner lining can be made by extrusion or wrapping. The thinnest point of the extruded inner lining should not be less than 80% of the nominal thickness, and the average thickness of the wrapped inner lining should not be less than 80% of the nominal thickness.

[0068] S6. Armor: The steel strip wrapping should be smooth and tight, without flaring, loosening, folding, gaps, or exposed bottoms. It is strictly prohibited to use folded, burred, uneven, or unqualified steel strips. The steel strip joints must be welded, with the overlap between 5 and 10 mm and the interface close to 45 degrees. The joints should be firm and repaired flat, without defects such as burn-through, burrs, and bent corners.

[0069] S7. Sheath extrusion: The sheath is extruded onto the twisted insulated core, oxygen barrier layer or metal armor layer through the cable core overmolding device, and can be easily stripped without damaging the insulation layer.

[0070] Reference Figures 2-8 In a preferred embodiment, the cable core overmolding device comprises:

[0071] A preparation base 7 is provided on which a fixing bracket 11 is provided, and an extruder body 10 is provided on the fixing bracket 11;

[0072] A mounting base 8 is provided on the preparation base 7 and a cooling guide groove 9 is provided on the mounting base 8;

[0073] Three coated guide rollers 13, all of which are arranged on a mounting base 8, and two transverse plates 15 are arranged on the mounting base 8;

[0074] The covering support unit 14 is provided on two horizontal plates 15 and is used to provide an upward force to the jacket layer to prevent the jacket layer from sinking and deforming before reaching the cooling area.

[0075] The coating cleaning module 12 is provided on the extruder body 10 and is used to clean the outer surface of the cable before coating.

[0076] Reference Figures 3-6 In a preferred embodiment, the coating support unit 14 includes:

[0077] Two mounting rods 1402 are provided on the two horizontal plates 15 . The outer walls of the two mounting rods 1402 are fixedly connected to gears 1401 , and the two gears 1401 are meshed with each other.

[0078] A drive motor 1414 is provided on an outer wall of one side of one of the horizontal plates 15 , and an output shaft of the drive motor 1414 is connected to one end of one of the mounting rods 1402 via a coupling;

[0079] Four connecting brackets 1415 are respectively disposed on the outer walls of the two mounting rods 1402 .

[0080] In the present invention, the coating support unit 14 further includes:

[0081] Four guide belt frames 1416 are respectively disposed on one side outer wall of the four connecting brackets 1415. Each of the four guide belt frames 1416 is provided with two shaft members 1410. The outer walls of the plurality of shaft members 1410 are respectively provided with a guide wheel 1405 and a guide wheel 2 1407.

[0082] Four fixing plates 1412 are respectively arranged on four guide belt frames 1416 . Two mounting shafts 1413 are respectively arranged on the four fixing plates 1412 . Reeling wheels 1403 are respectively arranged on the outer walls of the plurality of mounting shafts 1413 .

[0083] In the present invention, the coating support unit 14 further includes:

[0084] Four support belts 1404 are respectively arranged on the plurality of winding wheels 1403, and the outer walls of the four support belts 1404 are respectively in contact with the inner walls of the four guide wheels 1405 and the four guide wheels 2 1407;

[0085] The four movable openings 1417 are respectively opened on the four guide belt frames 1416 . The four supporting belts 1404 are each provided with a connecting piece 1418 , and the four connecting pieces 1418 are respectively located inside the four movable openings 1417 .

[0086] In the present invention, the coating support unit 14 further includes:

[0087] Four servo motors 1411, each of which is disposed on an outer wall of one side of four fixed plates 1412, with the output shafts of the four servo motors 1411 connected to one end of four mounting shafts 1413 via couplings;

[0088] Multiple linkage wheels 1409, each of which is disposed at the other end of the multiple mounting shafts 1413, and each two adjacent linkage wheels 1409 are provided with a same linkage belt 1408;

[0089] Two sinking and supporting rollers 1406 are respectively arranged on four connecting members 1418.

[0090] Specifically, after coating, the cable core and the coated sheath layer leave the extrusion port and are guided by the coating guide roller 13. At this time, the sinking roller 1406 contacts the sheath layer, and the servo motor 1411 runs. The servo motor 1411 drives the installation shaft 1413 to rotate, and cooperates with the linkage wheel 1409 and the linkage belt 1408 to make multiple installation shafts 1413 rotate synchronously, thereby rotating the reel 1403. At this time, the two reeling wheels 1403 on the same fixed plate 1412 tighten and loosen the sinking belt 1404 respectively, so that the sinking belt 1404 moves, thereby causing the connecting piece 1418 to move inside the movable port 1417, and then driving the sinking roller 1406 to run through the connecting piece 1418, and move upward along the outer wall of the sheath layer to provide an upward force on the sheath layer.

[0091] During reciprocating motion, the drive motor 1414 runs, and the drive motor 1414 drives the mounting rod 1402 to rotate, and further rotates the gear member 1401, so that the two mounting rods 1402 rotate in opposite directions, and then the mounting rod 1402 drives the guide belt frame 1416 to unfold, so that the sinking roller 1406 is separated from the sheath layer, and then the servo motor 1411 reverses, so that the sinking belt 1404 drives the connecting member 1418 and the sinking roller 1406 to reset, so as to provide reciprocating lifting force;

[0092] In a specific application scenario, the coating sinking and supporting unit 14 is suitable for the uncooled stage of the sheath layer after the cable is coated, that is, the coating sinking and supporting unit 14 can make the sinking and supporting roller 1406 move on the outer wall of the sheath layer after the cable core is coated and leaves the extruder, so as to provide an upward force to the sheath layer, thereby preventing the coated sheath layer from sinking and deforming before reaching the cooling area, thereby improving the cable core coating molding quality and increasing the use effect of the device;

[0093] It should be noted that during operation, the device can make the sinking and supporting rollers 1406 reciprocate upward to further improve the use effect of the device. At the same time, the sinking and supporting rollers 1406 can be separated from the sheath layer when resetting to avoid the resetting movement aggravating the sinking deformation.

[0094] Reference Figure 2 、 Figure 7 and Figure 8 In a preferred embodiment, the coating cleaning module 12 includes:

[0095] Universal motor 1205, which is disposed on one side outer wall of the extruder body 10, and the output shaft of the universal motor 1205 is connected to the driving gear 1204 via a coupling;

[0096] The annular rail 1206 is provided on the extruder body 10 , and a rotating ring frame 1202 is provided on the inner wall of the annular rail 1206 .

[0097] In the present invention, the coating cleaning module 12 further includes:

[0098] The gear ring 1201 is disposed on an outer wall of the rotating ring frame 1202 and meshes with the driving gear 1204;

[0099] Three negative pressure chambers 1207 are all provided on the outer wall of the other side of the rotating ring frame 1202 , and a threaded joint 1208 is provided on the outer wall of one side of the three negative pressure chambers 1207 ;

[0100] The three connecting chambers 1211 are respectively arranged on the three negative pressure chambers 1207 , and dust filter bags 1209 are arranged inside the three connecting chambers 1211 .

[0101] In the present invention, the coating cleaning module 12 further includes:

[0102] Three negative pressure pumps 1210 , which are respectively arranged on three connecting compartments 1211 ;

[0103] Three elastic brush plates 1203 are respectively arranged on the outer walls of three negative pressure chambers 1207 , and multiple cleaning suction cups 1212 are arranged on the three negative pressure chambers 1207 .

[0104] Specifically, before coating, the negative pressure pump 1210 and the universal motor 1205 are in operation, and the negative pressure pump 1210 discharges the gas inside the connecting chamber 1211 and the negative pressure chamber 1207, so that the interior of the negative pressure chamber 1207 is in a negative pressure state, thereby enabling the cleaning suction cup 1212 to clean the dust and impurities on the cable. At the same time, the universal motor 1205 drives the driving gear 1204 to rotate. Since the driving gear 1204 is engaged with the gear ring 1201, the gear ring 1201 can drive the rotating ring frame 1202 to rotate, thereby rotating the negative pressure chamber 1207, the cleaning suction cup 1212 and the elastic brush plate 1203, so as to further enhance the cleaning effect through the elastic brush plate 1203, until the dust and impurities are transported to the interior of the connecting chamber 1211 and collected by the dust filter bag 1209.

[0105] During processing, the connecting chamber 1211 is rotated to separate the connecting chamber 1211 from the threaded joint 1208 so as to take out the dust filter bag 1209 and process the dust impurities.

[0106] In a specific application scenario, the coating cleaning module 12 is suitable for the cleaning link before cable coating, that is, the coating cleaning module 12 can clean the outer surface of the cable before coating when in use, so as to ensure the cleanliness of the cable surface in the subsequent coating process, and prevent dust and impurities on the cable surface from adversely affecting the sheath coating, thereby improving the coating effect of the device during use and further increasing the coating quality;

[0107] It should be noted that after cleaning, the connecting chamber 1211 and the threaded joint 1208 can be disassembled to facilitate the staff to remove the dust filter bag 1209 inside the connecting chamber 1211, thereby facilitating centralized processing of dust and impurities.

[0108] Working principle:

[0109] Before coating, the negative pressure pump 1210 and the universal motor 1205 are in operation, and the negative pressure pump 1210 discharges the gas inside the connecting chamber 1211 and the negative pressure chamber 1207, so that the interior of the negative pressure chamber 1207 is in a negative pressure state, thereby enabling the cleaning suction cup 1212 to clean the dust and impurities on the cable. At the same time, the universal motor 1205 drives the driving gear 1204 to rotate. Since the driving gear 1204 is engaged with the gear ring 1201, the gear ring 1201 can drive the rotating ring frame 1202 to rotate, thereby rotating the negative pressure chamber 1207, the cleaning suction cup 1212 and the elastic brush plate 1203, so as to further enhance the cleaning effect through the elastic brush plate 1203, until the dust and impurities are transported to the interior of the connecting chamber 1211 and collected by the dust filter bag 1209;

[0110] During processing, the connecting chamber 1211 is rotated to separate the connecting chamber 1211 from the threaded joint 1208 so as to take out the dust filter bag 1209 and process the dust impurities.

[0111] After coating, the cable core and the coated sheath layer leave the extrusion port and are guided by the coating guide roller 13. At this time, the sinking roller 1406 contacts the sheath layer, and the servo motor 1411 runs. The servo motor 1411 drives the installation shaft 1413 to rotate, and cooperates with the linkage wheel 1409 and the linkage belt 1408 to make multiple installation shafts 1413 rotate synchronously, thereby rotating the reel 1403. At this time, the two reeling wheels 1403 on the same fixed plate 1412 tighten and loosen the sinking belt 1404 respectively, so that the sinking belt 1404 moves, thereby making the connecting piece 1418 move inside the movable port 1417, and then driving the sinking roller 1406 to run through the connecting piece 1418, and move upward along the outer wall of the sheath layer to provide an upward force on the sheath layer;

[0112] During reciprocating motion, the drive motor 1414 runs, and the drive motor 1414 drives the mounting rod 1402 to rotate, and further rotates the gear part 1401, so that the two mounting rods 1402 rotate in opposite directions, and then the mounting rod 1402 drives the guide belt frame 1416 to unfold, so that the sinking and supporting roller 1406 is separated from the sheath layer, and then the servo motor 1411 reverses, so that the sinking and supporting belt 1404 drives the connecting part 1418 and the sinking and supporting roller 1406 to reset, so as to provide reciprocating lifting force.

[0113] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for preparing a flame-retardant control cable, comprising: A plurality of conductor bodies (5), each of the plurality of conductor bodies (5) being provided with an insulating outer layer (4) on its exterior, and each of the plurality of insulating outer layers (4) being provided with a filling layer (6) on its exterior; An inner lining body (3) is provided on the outer wall of the filling layer (6), the outer wall of the inner lining body (3) is provided with a steel belt armor (2), and the outer wall of the steel belt armor (2) is provided with a flame retardant sheath (1), characterized in that the cable preparation method comprises the following steps: S1. Stranded conductor: Stranded conductor must be smooth and free of burrs, broken wires, and loose strands. The diameter of the single wire should be greater than 0.2mm for welding. The joint spacing should be ≥300mm. The strands should be tightly and evenly twisted. Loose strands are prohibited. S2. Insulation extrusion: The insulation tightly covers the conductor, and the surface is smooth without burnt particles; S3. Cabling process: The cores are arranged clockwise in numerical order. Pitch control: Hard conductors ≤ 20 times the core outer diameter, soft conductors ≤ 16 times the outer diameter. The outermost layer of the cable is right-hand twisted, and adjacent layers are twisted in opposite directions. S4. Metal shielding: When using copper tape, copper-plastic tape, or aluminum-plastic tape for shielding, the overlap rate should be no less than 15%. When wrapping the copper-plastic tape or aluminum-plastic tape, the metal surface should face inward. In addition, a 7 / 0.2mm annealed bare copper wire should be added longitudinally underneath as a drain wire. S5. Inner lining: The inner lining is made by extrusion or wrapping. The thinnest point of the extruded inner lining is not less than 80% of the nominal thickness, and the average thickness of the wrapped inner lining is not less than 80% of the nominal thickness. S6, Armor: The steel tape wrapping should be smooth and tight, without flaring, looseness, folding, gaps, or exposed bottoms. The steel tape joints should be welded with an overlap of 5 to 10 mm and a 45° angle. The joints should be firm and smooth after repair, without burn-through, burrs, or corner defects. S7, sheath extrusion: the sheath is extruded onto the twisted insulation core, oxygen barrier layer or metal armor layer through the cable core overmolding device; The cable core overmolding device comprises: A preparation base (7) is provided on the preparation base (7), a fixed bracket (11) is provided on the fixed bracket (11), and an extruder body (10) is provided on the fixed bracket (11); A mounting base (8), the mounting base (8) being arranged on the preparation base (7), and a cooling guide groove (9) being provided on the mounting base (8); Three coated guide rollers (13), each of the three coated guide rollers (13) is disposed on a mounting base (8), and two transverse plates (15) are disposed on the mounting base (8); A cladding support unit (14), the cladding support unit (14) being arranged on two transverse plates (15), and the cladding support unit (14) being used to provide an upward force to the jacket layer to prevent the cladding layer from sinking and deforming when the cladding layer does not reach the cooling area; A coating cleaning module (12), the coating cleaning module (12) is arranged on the extruder body (10), and the coating cleaning module (12) is used to clean the outer surface of the cable before coating; The covering support unit (14) comprises two mounting rods (1402), the two mounting rods (1402) are arranged on two transverse plates (15), the outer walls of the two mounting rods (1402) are fixedly connected with gears (1401), and the two gears (1401) are meshed with each other; The covering support unit (14) further includes a driving motor (1414), the driving motor (1414) being arranged on an outer wall of one side of one of the transverse plates (15), and the output shaft of the driving motor (1414) being connected to one end of one of the mounting rods (1402) via a coupling; The covering support unit (14) further comprises four connecting brackets (1415), and the four connecting brackets (1415) are respectively arranged on the outer walls of the two mounting rods (1402); The wrapping support unit (14) further comprises four guide belt frames (1416), the four guide belt frames (1416) being respectively arranged on one side outer wall of the four connecting brackets (1415), the four guide belt frames (1416) being respectively provided with two shaft members (1410), and the outer walls of the plurality of shaft members (1410) being respectively provided with a guide wheel 1 (1405) and a guide wheel 2 (1407); The wrapping support unit (14) further comprises four fixed plates (1412), the four fixed plates (1412) being respectively arranged on four guide belt frames (1416), two mounting shafts (1413) being respectively arranged on the four fixed plates (1412), and the outer walls of the plurality of mounting shafts (1413) being respectively provided with a winding wheel (1403); The wrapping support unit (14) further comprises four support belts (1404), the four support belts (1404) being respectively arranged on a plurality of winding wheels (1403), and the outer walls of the four support belts (1404) being respectively in contact with the inner walls of four guide wheels 1 (1405) and four guide wheels 2 (1407); The covering support unit (14) further comprises four movable openings (1417), the four movable openings (1417) being respectively opened on the four guide belt frames (1416), the four support belts (1404) being respectively provided with connecting pieces (1418), the four connecting pieces (1418) being respectively located inside the four movable openings (1417); The covering support unit (14) further comprises four servo motors (1411), the four servo motors (1411) being respectively arranged on one side outer wall of four fixed plates (1412), and the output shafts of the four servo motors (1411) being respectively connected to one end of four mounting shafts (1413) via couplings; The covering support unit (14) further comprises a plurality of linkage wheels (1409), wherein the plurality of linkage wheels (1409) are respectively arranged at the other ends of the plurality of mounting shafts (1413), and each two adjacent linkage wheels (1409) are provided with the same linkage belt (1408); The coating support unit (14) further comprises two support rollers (1406), and the two support rollers (1406) are respectively arranged on four connecting members (1418).

2. A cable preparation method according to claim 1, characterized in that: The coating cleaning module (12) comprises: A universal motor (1205), the universal motor (1205) is arranged on an outer wall of one side of the extruder body (10), and the output shaft of the universal motor (1205) is connected to the driving gear (1204) via a coupling; An annular rail (1206) is provided on the extruder body (10), and a rotating ring frame (1202) is provided on the inner wall of the annular rail (1206).

3. A cable preparation method according to claim 2, characterized in that: The coating cleaning module (12) further comprises: A gear ring (1201), the gear ring (1201) is arranged on an outer wall of one side of the rotating ring frame (1202), and the gear ring (1201) is meshed with a driving gear (1204); Three negative pressure chambers (1207), all of which are arranged on the outer wall of the other side of the rotating ring frame (1202), and one outer wall of each of the three negative pressure chambers (1207) is provided with a threaded joint (1208); Three connecting chambers (1211), the three connecting chambers (1211) are respectively arranged on the three negative pressure chambers (1207), and dust filter bags (1209) are arranged inside the three connecting chambers (1211).

4. A cable preparation method according to claim 3, characterized in that: The coating cleaning module (12) further comprises: Three negative pressure pumps (1210), the three negative pressure pumps (1210) are respectively arranged on the three connecting compartments (1211); Three elastic brush plates (1203) are respectively arranged on the outer walls of three negative pressure chambers (1207), and a plurality of cleaning suction cups (1212) are arranged on each of the three negative pressure chambers (1207).

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