A fire-resistant wire and its manufacturing process

Abstract

This invention discloses a fire-resistant wire and its manufacturing process, relating to the field of fire-resistant wire technology, aiming to solve the technical problem of insufficient fire resistance in existing fire-resistant wires. The wire includes a copper conductor; the surface of the copper conductor is coated with a high-temperature resistant fire-resistant coating, which is composed of a two-component high-temperature resistant insulating ceramic varnish; double-layer calcined mica tape is wound around the copper conductor after the high-temperature resistant fire-resistant coating with a 50% overlap rate. This invention uses an organic silicone resin, an inorganic potassium silicate / lithium silicate composite system, and special additives to form a ceramic protective layer after curing; combined with the double-layer winding of calcined mica tape with a 50% overlap rate, the fire resistance of the wire is extended from 750°C for 90 minutes to 950°C for 180 minutes, effectively improving the fire resistance effect compared to traditional wires. In the event of a fire, the wire can maintain its integrity and stable power supply for a long time, gaining valuable time for fire rescue and emergency equipment operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fireproof wire, more particularly to a fireproof wire and a manufacturing process thereof. BACKGROUND

[0002] The current fireproof wire field mainly adopts the GB / T19216.21-2003 standard, and the core test requirement is to maintain power supply for 90 minutes at 750°C. However, the modern building fire environment presents the following new characteristics:

[0003] The fire temperature generally reaches 900-1100°C (according to the NFPA research report), the evacuation time of high-rise buildings needs 120-180 minutes (referring to the GB50016-2014 specification), the proportion of electrical fires is more than 35% (China Fire Statistics Yearbook 2022 data), and the traditional structure (copper conductor + double-layer mica + polyolefin) has obvious defects: ordinary mica tape will delaminate and peel off at more than 800°C (confirmed by SEM microscopic observation); single-component fireproof paint is prone to cracking (the difference in the coefficient of thermal expansion is 8.7x10-“ / °C).

[0004] The fireproof effect or fire resistance effect of the traditional fireproof wire is insufficient, so that it cannot fully meet the existing fire rescue and disaster handling, and in view of this, the present application provides a fireproof wire and a manufacturing process thereof. SUMMARY

[0005] The present application aims to provide a fireproof wire and a manufacturing process thereof to solve the technical problem of insufficient fireproof property of the existing fireproof wire.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a fireproof wire, comprising a copper conductor; a high-temperature resistant fireproof coating is coated on the surface of the copper conductor, and the high-temperature resistant fireproof coating is composed of a double-component high-temperature resistant insulating ceramic paint; a double-layer calcined mica tape is wound on the copper conductor after the high-temperature resistant fireproof coating at a lap rate of 50%; an outer layer of low-smoke halogen-free polyolefin sheath is wrapped on the outer surface of the double-layer calcined mica tape; wherein the high-temperature resistant fireproof coating comprises an organic silicon resin, an inorganic potassium silicate, and an inorganic lithium silicate compound.

[0007] The present application adopts an organic silicon resin, an inorganic potassium silicate / lithium silicate compound system, and special additives to form a ceramic protective layer after curing; in combination with the double-layer winding of the calcined mica tape at a lap rate of 50%, the fire resistance of the wire is prolonged from the original 750° 90 minutes to 950° 180 minutes, which effectively improves the fireproof and fire resistance effect compared with the traditional wire, and the wire can still maintain the line integrity and stable power supply for a long time in case of fire, thereby gaining golden time for fire rescue, equipment emergency operation, etc.

[0008] The manufacturing process of the fireproof wire is realized based on an integrated manufacturing device, the device comprising a unwinding machine, the output end of the unwinding machine being provided with a drying and coating integrated unit, the output end of the drying and coating integrated unit being provided with a mica winding mechanism, the output end of the mica winding mechanism being provided with a tensioning mechanism, one side of the tensioning mechanism being provided with a sheath extruding mechanism for wrapping an outer layer of low-smoke and halogen-free polyolefin sheath on the surface of the fireproof wire, the drying and coating integrated unit comprising an integrated frame, double-sided coating grooves being arranged on the integrated frame, two-way driving mechanisms being symmetrically arranged on both sides of the double-sided coating grooves, the two-way driving mechanisms being drivingly connected through power output mechanisms, and quartz lamp groups being arranged between the double-sided coating grooves on the top of the two two-way driving mechanisms.

[0009] Preferably, the two-way driving mechanisms comprise two groups of fixed seats arranged in a row, eight fixed seats being arranged on both sides of the integrated frame, four fixed seats located at the low end being arranged coaxially in pairs, key shafts being fixedly arranged between two fixed seats located at the low end and arranged coaxially, and anti-swing rotating frames being connected to the key shafts.

[0010] Preferably, the four fixed seats located at the high end are arranged coaxially in pairs, synchronous meshing shaft covers are fixedly arranged between two fixed seats located at the high end and arranged coaxially, the synchronous meshing shaft covers have an arc-shaped structure in cross section, a plurality of extrusion teeth are arranged on the surface of the synchronous meshing shaft cover along the axial position of the fixed seat, rotating ratchet shaft members are coaxially arranged outside the synchronous meshing shaft cover, a plurality of spiral grooves that are extrusion-fitted with the extrusion teeth are arranged on the inner wall of the rotating ratchet shaft member, a plurality of ratchet teeth are rotationally arranged on the outer surface of the rotating ratchet shaft member, the ratchet teeth and the rotating ratchet shaft member are elastically connected, a one-way driving wheel is arranged on the outer surface of the rotating ratchet shaft member, the one-way driving wheel is rotationally connected with the anti-swing rotating frame, the one-way driving wheel gap constitutes a ratchet groove, and the one-way driving wheel and the rotating ratchet shaft member constitute a ratchet structure through the ratchet groove and the ratchet teeth.

[0011] Preferably, a reciprocating driving shaft is arranged at the axial position of the synchronous meshing shaft cover, two groups of first-adjacent spiral driving grooves are arranged on the surface of the reciprocating driving shaft, a synchronous wheel A for power input is arranged at the end of the reciprocating driving shaft, two positioning shafts are rotationally arranged at both ends of the reciprocating driving shaft, a driving shaft sleeve is arranged outside the reciprocating driving shaft, the driving shaft sleeve is key-connected with the two positioning shafts, a meshing wedge is rotationally arranged on the inner wall of the driving shaft sleeve, and connecting arc-shaped members fixedly connected with the anti-swing rotating frame are arranged on both sides of the lower end of the driving shaft sleeve.

[0012] Preferably, one of the unidirectional drive wheels relatively close to the unwinding machine has a positioning groove A on its surface; and the other unidirectional drive wheel relatively far from the unwinding machine has a variable diameter structure, and the other unidirectional drive wheel relatively far from the unwinding machine has a positioning groove B on its surface; and the positioning groove B includes a plurality of connecting grooves A and at least one misalignment groove; and the positioning grooves A and B are staggered.

[0013] Preferably, the surfaces of the two unidirectional drive wheels are wrapped with copper conductors in a three-dimensional figure-eight shape.

[0014] Preferably, the power output mechanism includes a drive motor; the drive motor is arranged at the top of the double-sided coating tank; a synchronous pulley B is provided at the output end of the drive motor; and the reciprocating drive shaft forms a transmission structure with the drive motor through synchronous pulley A, synchronous pulley B, and synchronous belt.

[0015] Preferably, the inner wall of the double-sided coating tank is fixedly provided with a comb-shaped actuating plate; the end of the actuating plate is provided with a plurality of actuating grooves, and the edges of the actuating grooves are all chamfered; the copper conductor moves axially along the reciprocating drive shaft, so that the copper conductor and the actuating grooves make active contact to form an actuating structure, causing the coating layer accumulated on the surface of the inclined copper conductor to fall off due to vibration.

[0016] A manufacturing process for a fire-resistant electrical wire includes the following steps:

[0017] S100: Copper conductor drawing; drawing an 8mm diameter copper rod to standard specifications;

[0018] S200: Coating and drying process; the unwinding machine performs intermittent unwinding, and the winding equipment performs uniform winding; during the pulling process of the copper conductor, the copper conductor is arranged on two unidirectional drive wheels by a three-dimensional figure-eight winding, and is limited by positioning groove A, connecting groove A and misalignment groove. Then, through the power input of the power output mechanism, the reciprocating drive shaft is rotated, so that the meshing wedge moves back and forth along the spiral drive groove, so that the drive shaft sleeve moves relative to both sides. At the same time, based on the movement of the drive shaft sleeve, the connecting arc part and the rotating ratchet shaft are rotated synchronously. The spiral groove set in the rotating ratchet shaft contacts the extrusion teeth to form a cam structure. In the ratchet meshing state, the unidirectional drive wheel rotates, so that the unidirectional drive wheel forms an intermittent unidirectional rotation and reciprocating movement on both sides; so that the copper conductor is intermittently flipped and conveyed in a three-dimensional figure-eight winding shape. When the copper conductor is at the bottom of the unidirectional drive wheel, the coating is applied. When the copper conductor moves obliquely at the top of the unidirectional drive wheel, it is dried and cured.

[0019] S300: Mica winding; Double-layer calcined mica strip is wound with a 50% overlap rate through a bidirectional self-adjusting mica winding mechanism;

[0020] S400, sheath extrusion; after passing through a tensioning mechanism, a low-smoke halogen-free polyolefin sheath is coated using an 80-type extruder.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention uses a combination of organosilicon resin, inorganic potassium silicate / lithium silicate, and special additives to form a ceramic protective layer after curing; combined with double-layer winding of calcined mica tape with a 50% overlap, the fire resistance of the wire is extended from 750°C for 90 minutes to 950°C for 180 minutes. Compared with traditional wires, this effectively improves the fire resistance effect. In the event of a fire, the wire can still maintain its integrity and stable power supply for a long time, thus gaining golden time for fire rescue and emergency equipment operation.

[0023] 2. This invention uses a bidirectional drive mechanism and quartz lamps arranged opposite to each other to form a reciprocating fireproof coating application operation and to perform multiple required coating drying and curing operations under a single quartz lamp. This method effectively reduces the large span of manufacturing space required for traditional linear fireproof wire manufacturing production lines, thus optimizing the land area for small and medium-sized wire manufacturing industries.

[0024] 3. The present invention provides the necessary support for the bidirectional drive mechanism by connecting the anti-sway rotating frame and the key shaft, thereby avoiding motion interference from other moving parts of the bidirectional drive mechanism.

[0025] 4. In this invention, the ratchet structure formed by the unidirectional drive wheel, ratchet teeth, and the rotating ratchet shaft causes the unidirectional drive wheel to rotate only in one direction. The rotation achieves contact between the copper conductor and the unidirectional drive wheel without friction, reducing wear on the copper conductor. At the same time, the unidirectional rotation, which is also an intermittent rotation, avoids the backflow of the copper conductor caused by reverse rotation.

[0026] 5. This invention utilizes the action of meshing wedges to ensure that the reciprocating drive shaft rotates only in one direction during its rotational motion. This is achieved by using two sets of interconnected spiral drive grooves on the surface of the reciprocating drive shaft, which effectively separates the coating liquid phase from the anti-sway rotating frame and some components. This method effectively reduces the adhesion problems caused by the quartz lamp assembly being positioned on the coating liquid phase, resulting in the coating liquid phase solidifying and adhering to the copper conductor surface, thus improving the yield rate.

[0027] 6. In this invention, the unidirectional drive wheel, which is relatively far from the unwinding machine, is designed with a variable diameter structure. This results in a size difference between the positioning groove B, which is located at the smaller diameter end, and the connecting groove A. By manually controlling the height of the coating liquid, only the part of the connecting groove A, which has a relatively larger diameter, comes into contact with the coating liquid. This method effectively controls the number of coatings that have been applied as required, and avoids the situation where the coating is too thick due to the operation of this device.

[0028] 7. The present invention creates a staggered effect by winding the copper conductors of the two unidirectional drive wheels in a three-dimensional figure-eight shape. This allows a single quartz lamp assembly to be dried and cured multiple times, reducing the need for excessively long manufacturing lines.

[0029] 8. In this invention, the copper conductor is wound in a three-dimensional figure-eight shape. As a result, the copper conductor cannot be kept horizontal by tensioning the wire during the manufacturing process, as is the case with traditional manufacturing equipment. This three-dimensional figure-eight winding method is prone to causing excess, uncured coating liquid phase to accumulate on the inclined section of the copper conductor. When it cures, the coating becomes too thick in some areas. By setting up a toggle groove, and with the movement of the unidirectional drive wheel on both sides, a similar effect to plucking a string is formed. In this way, the excess coating liquid can be vibrated off. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure of the drying and coating integrated unit of the present invention;

[0032] Figure 3 This is a cross-sectional three-dimensional structural diagram of the double-sided coating tank of the present invention;

[0033] Figure 4 This is a three-dimensional structural diagram of the power output mechanism of the present invention;

[0034] Figure 5 This is a schematic diagram of the internal structure of the bidirectional drive mechanism of the present invention;

[0035] Figure 6 This is a schematic diagram of the three-dimensional structure of the bidirectional drive mechanism of the present invention.

[0036] Figure 7 This is a top view of the bidirectional drive mechanism of the present invention;

[0037] Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at point B in the middle;

[0038] Figure 9 For the present invention Figure 7A magnified schematic diagram of the structure at point C in the middle;

[0039] Figure 10 For the present invention Figure 3 A magnified view of the structure at point A in the middle;

[0040] Figure 11 This is a schematic diagram of the cross-sectional structure of the fireproof wire of the present invention.

[0041] Explanation of the labels in the diagram:

[0042] 1. Unwinding machine; 2. Drying and coating integrated unit; 3. Mica winding mechanism; 4. Integrated frame; 5. Double-sided coating tank; 6. Bidirectional drive mechanism; 7. Power output mechanism; 8. Quartz lamp assembly;

[0043] 501, Toggle plate; 5011, Toggle groove;

[0044] 601. Fixed base; 602. Key shaft; 603. Anti-sway rotating frame; 604. Synchronous meshing shaft cover; 6041. Pressing tooth; 605. Rotating ratchet shaft; 6051. Helical groove; 606. Ratchet tooth; 607. One-way drive wheel; 608. Reciprocating drive shaft; 6081. Helical drive groove; 609. Positioning shaft; 6010. Meshing wedge; 6014. Drive shaft sleeve; 6011. Connecting arc-shaped component;

[0045] 701. Drive motor;

[0046] 1201, Copper conductor; 1202, High-temperature fireproof coating; 1203, Double-layer calcined mica tape; 1204, Outer layer low-smoke halogen-free polyolefin sheath. Detailed Implementation

[0047] like Figure 11 As shown, this invention relates to a fire-resistant wire, comprising a copper conductor; a high-temperature fire-resistant coating is coated on the surface of the copper conductor, the high-temperature fire-resistant coating being composed of a two-component high-temperature insulating ceramic varnish; a double layer of calcined mica tape is wound around the copper conductor after the high-temperature fire-resistant coating with a 50% overlap rate; an outer low-smoke halogen-free polyolefin sheath is wrapped around the outer surface of the double layer of calcined mica tape; wherein, the high-temperature fire-resistant coating comprises a compound of organosilicon resin, inorganic potassium silicate, and inorganic lithium silicate. This invention uses an organosilicon resin, an inorganic potassium silicate / lithium silicate compound system, and special additives to form a ceramic protective layer after curing; combined with the double-layer winding of calcined mica tape with a 50% overlap rate, the fire resistance of the wire is extended from the original 750°C for 90 minutes to 950°C for 180 minutes, effectively improving the fire resistance effect compared to traditional wires. In the event of a fire, the line can remain intact and stably powered for a long time, gaining valuable time for fire rescue and emergency equipment operation.

[0048] like Figures 1-10As shown, this invention relates to a manufacturing process for fire-resistant wires. This manufacturing process is based on an integrated manufacturing device, which includes an unwinding machine 1; a drying and coating integrated unit 2 is provided at the output end of the unwinding machine 1; a mica winding mechanism 3 is provided at the output end of the drying and coating integrated unit 2; wherein, a tensioning mechanism is provided at the output end of the mica winding mechanism 3; a sheath extrusion mechanism for wrapping the outer layer of low-smoke halogen-free polyolefin sheath on the surface of the fire-resistant wire is provided on one side of the tensioning mechanism; the drying and coating integrated unit 2 includes an integrated frame 4; a double-sided coating tank 5 is provided on the integrated frame 4; bidirectional drive mechanisms 6 are symmetrically arranged on both sides of the double-sided coating tank 5; and the bidirectional drive mechanisms 6 are connected by a power output mechanism 7; a quartz lamp group 8 is provided between the two bidirectional drive mechanisms 6 at the top of the double-sided coating tank 5. This invention uses a bidirectional drive mechanism 6 and quartz lamp groups 8 arranged opposite to each other to form a reciprocating fireproof coating application operation and to perform multiple required coating drying and curing operations under a single quartz lamp group 8. This method effectively reduces the large span of manufacturing space required for traditional linear fireproof wire manufacturing production lines, thus optimizing the land area for small and medium-sized wire manufacturing industries.

[0049] In an embodiment of the present invention, the bidirectional drive mechanism 6 includes two sets of stacked fixed seats 601; eight fixed seats 601 are arranged on both sides of the integrated frame 4; wherein, four fixed seats 601 located at the lower end are arranged coaxially in pairs; and a key shaft 602 is fixedly provided between two fixed seats 601 located at the lower end and arranged coaxially; an anti-sway rotating frame 603 is keyed to the key shaft 602. The present invention, through the keyed connection between the anti-sway rotating frame 603 and the key shaft 602, forms the support required for the operation of the bidirectional drive mechanism 6, avoiding motion interference with other moving parts of the bidirectional drive mechanism 6.

[0050] In an embodiment of the present invention, four fixed seats 601 located at the upper end are arranged coaxially in pairs; and a synchronous meshing shaft cover 604 is fixedly provided between two fixed seats 601 located at the upper end and arranged coaxially; wherein, the synchronous meshing shaft cover 604 has an arc-shaped cross-section; the surface of the synchronous meshing shaft cover 604 is provided with a plurality of pressing teeth 6041 at least along the axial position of the fixed seat 601; a rotating ratchet shaft 605 is coaxially provided on the outside of the synchronous meshing shaft cover 604; wherein, the inner wall of the rotating ratchet shaft 605 is provided with a plurality of pressing teeth 6041. The pressure tooth 6041 presses the matching spiral groove 6051; and a plurality of ratchet teeth 606 are rotatably provided on the outer surface of the rotating ratchet shaft 605; the ratchet teeth 606 are elastically connected to the rotating ratchet shaft 605; a one-way drive wheel 607 is provided on the outer surface of the rotating ratchet shaft 605; and the one-way drive wheel 607 is rotatably connected to the anti-sway rotating frame 603; and the gap in the inner wall of the one-way drive wheel 607 forms a ratchet groove; wherein, the one-way drive wheel 607 and the rotating ratchet shaft 605 form a ratchet structure through the ratchet groove and ratchet teeth 606. In this invention, the unidirectional drive wheel 607 forms a ratchet structure with ratchet teeth 606 and rotating ratchet shaft 605, which causes the unidirectional drive wheel 607 to rotate only in one direction. Through rotation, the copper conductor and the unidirectional drive wheel 607 are brought into contact without friction, reducing wear on the copper conductor. At the same time, the unidirectional rotation, which is also an intermittent rotation, avoids the backflow of the copper conductor caused by reverse rotation.

[0051] In an embodiment of the present invention, a reciprocating drive shaft 608 is provided at the axial position of the synchronous meshing shaft cover 604; two sets of helical drive grooves 6081 connected end to end are opened on the surface of the reciprocating drive shaft 608; and a synchronous wheel A for power input is provided at the end of the reciprocating drive shaft 608; two positioning shafts 609 are rotatably provided at both ends of the reciprocating drive shaft 608; a drive shaft sleeve 6014 is sleeved on the outside of the reciprocating drive shaft 608; the drive shaft sleeve 6014 is keyed to the two positioning shafts 609, and a meshing wedge 6010 is rotatably provided on the inner wall of the drive shaft sleeve 6014; and connecting arc-shaped parts 6011 fixedly connected to the anti-sway rotating frame 603 are provided on both sides of the lower end of the drive shaft sleeve 6014. The present invention utilizes the action of the meshing wedge 6010 to cause the reciprocating drive shaft 608 to rotate only in one direction during its rotational motion. This is achieved by the two sets of interconnected spiral drive grooves 6081 on the surface of the reciprocating drive shaft 608, which effectively separates the coating liquid phase from the anti-sway rotating frame 603 and some parts. This method effectively reduces the adhesion of the coating liquid phase to the copper conductor surface caused by the quartz lamp group 8 being arranged on the coating liquid phase, thereby improving the yield rate.

[0052] In an embodiment of the present invention, one of the unidirectional drive wheels 607 relatively close to the unwinding machine 1 has a positioning groove A on its surface; and the other unidirectional drive wheel 607 relatively far from the unwinding machine 1 has a variable diameter structure, and the other unidirectional drive wheel 607 relatively far from the unwinding machine 1 has a positioning groove B on its surface; and the positioning groove B includes a plurality of connecting grooves A and at least one misalignment groove; and the positioning grooves A and B are staggered. Figure 5 Figure 9 As shown, in this invention, the unidirectional drive wheel 607, which is relatively far from the unwinding machine 1, is designed with a variable diameter structure. This results in a size difference between the positioning groove B and the connecting groove A, which are located at the smaller diameter end. By manually controlling the height of the coating liquid, only the part of the connecting groove A with the larger diameter comes into contact with the coating liquid. This method effectively controls the number of coatings that have been applied and avoids the situation where the coating is too thick due to the operation of this device.

[0053] In an embodiment of the present invention, copper conductors are wound in a three-dimensional figure-eight shape around the surfaces of the two unidirectional drive wheels 607. By winding the copper conductors of the two unidirectional drive wheels 607 in a three-dimensional figure-eight shape, the present invention creates a staggered effect, thereby enabling a single quartz lamp assembly 8 to undergo multiple drying and curing processes, reducing the need for excessively long manufacturing lines.

[0054] In an embodiment of the present invention, the power output mechanism 7 includes a drive motor 701; the drive motor 701 is arranged on the top of the double-sided coating tank 5; a synchronous pulley B is provided at the output end of the drive motor 701; and the reciprocating drive shaft 608 forms a transmission structure with the drive motor 701 through the synchronous pulley A, the synchronous pulley B, and the synchronous belt.

[0055] In an embodiment of the present invention, a comb-shaped actuating plate 501 is fixedly provided on the inner wall of the double-sided coating tank 5; a plurality of actuating grooves 5011 are provided at the end of the actuating plate 501, and the edges of the actuating grooves 5011 are all chamfered; the copper conductor moves axially along the reciprocating drive shaft 608, so that the copper conductor and the actuating grooves 5011 make active contact to form a actuating structure, causing the coating layer accumulated on the surface of the inclined copper conductor to fall off due to vibration. In the present invention, based on the copper conductor arranged in a three-dimensional figure-eight shape, the copper conductor cannot be kept horizontal by tensioning as in traditional manufacturing equipment during the manufacturing process. This three-dimensional figure-eight winding method is very likely to cause excess uncured coating liquid phase to accumulate in the inclined section of the copper conductor, resulting in local coating thickness under curing. By setting the actuating grooves 5011, in conjunction with the movement of the unidirectional drive wheel 607 on both sides, such as Figure 10 The effect shown resembles plucking a string, which can vibrate and remove excess coating liquid.

[0056] Working principle: A manufacturing process for fire-resistant electrical wires; usage steps:

[0057] S100: Copper conductor drawing; drawing an 8mm diameter copper rod to standard specifications;

[0058] S200: Coating and drying treatment; the unwinder 1 performs intermittent unwinding and uniform winding with the winding equipment; during the pulling process of the copper conductor, the copper conductor is arranged on two unidirectional drive wheels 607 by a three-dimensional figure-eight winding, and is limited by the positioning groove A, the connecting groove A and the misalignment groove. Then, through the power input of the power output mechanism 7, the reciprocating drive shaft 608 is rotated, so that the meshing wedge 6010 reciprocates along the spiral drive groove 6081, so that the drive shaft sleeve 6014 moves relative to both sides, and at the same time, based on the movement of the drive shaft sleeve 6014... The synchronous drive rotates the connecting arc-shaped component 6011 and the rotating ratchet shaft 605. The spiral groove 6051 inside the rotating ratchet shaft 605 contacts the pressing teeth 6041 to form a cam structure. In the ratchet engagement state, the one-way drive wheel 607 rotates, causing the one-way drive wheel 607 to rotate intermittently in one direction and move back and forth on both sides. This causes the copper conductor to be intermittently flipped and conveyed in a three-dimensional figure-eight winding shape. When the copper conductor is at the bottom of the one-way drive wheel 607, the coating is applied. When the copper conductor moves obliquely at the top of the one-way drive wheel 607, it is dried and cured.

[0059] S300: Mica winding; Double-layer calcined mica strip is wound with a 50% overlap rate through a bidirectional self-adjusting mica winding mechanism 3;

[0060] S400, sheath extrusion; after passing through a tensioning mechanism, a low-smoke halogen-free polyolefin sheath is coated using an 80-type extruder.

[0061] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A process for the manufacture of a fire resistant electrical cable, characterized in that, The manufacturing process is realized based on an integrated manufacturing device, which comprises a unwinding machine (1); the output end of the unwinding machine (1) is provided with a drying coating integrated unit (2); the output end of the drying coating integrated unit (2) is provided with a mica winding mechanism (3); wherein the output end of the mica winding mechanism (3) is provided with a tensioning mechanism; one side of the tensioning mechanism is provided with a sheath extruding mechanism for wrapping an outer layer of low-smoke halogen-free polyolefin sheath on the surface of the fireproof wire; The drying coating integrated unit (2) comprises an integrated frame (4); the integrated frame (4) is provided with a double-sided coating groove (5); The double-sided coating groove (5) is symmetrically provided with a bidirectional driving mechanism (6) on both sides; and the bidirectional driving mechanism (6) is drivingly connected through a power output mechanism (7); The double-sided coating groove (5) is provided with a quartz lamp group (8) between the two bidirectional driving mechanisms (6) on the top; The bidirectional driving mechanism (6) comprises two groups of fixed seats (601) arranged in a row; eight fixed seats (601) are arranged on both sides of the integrated frame (4); Wherein, the four fixed seats (601) located at the low end are coaxially arranged in pairs; And a key shaft (602) is fixedly arranged between the two fixed seats (601) located at the low end and coaxially arranged; the key shaft (602) is rotatably connected with an anti-swing rotating frame (603); The four fixed seats (601) located at the high end are coaxially arranged in pairs; and a synchronous meshing shaft cover (604) is fixedly arranged between the two fixed seats (601) located at the high end and coaxially arranged; wherein the cross section of the synchronous meshing shaft cover (604) is an arc structure; A plurality of extrusion teeth (6041) are arranged on the surface of the synchronous meshing shaft cover (604) along the axial position of the fixed seat (601); The synchronous meshing shaft cover (604) is coaxially provided with a rotating ratchet shaft member (605) outside; Wherein, a plurality of spiral grooves (6051) are arranged on the inner wall of the rotating ratchet shaft member (605) and are extrusion-fitted with the extrusion teeth (6041); And a plurality of ratchet teeth (606) are rotatably arranged on the outer surface of the rotating ratchet shaft member (605); the ratchet teeth (606) are elastically connected between the rotating ratchet shaft member (605); A one-way driving wheel (607) is arranged on the outer surface of the rotating ratchet shaft member (605); and the one-way driving wheel (607) is rotatably connected with the anti-swing rotating frame (603); and the inner wall gap of the one-way driving wheel (607) forms a ratchet groove; wherein the one-way driving wheel (607) and the rotating ratchet shaft member (605) form a ratchet structure through the ratchet groove and the ratchet teeth (606), so that the one-way driving wheel (607) can only make one-way rotation, and the copper conductor is in contact with the one-way driving wheel (607) through rotation.

2. The process for manufacturing a fire resistant electrical cable according to claim 1, wherein, The synchronous engagement shaft cover (604) is provided with a reciprocating drive shaft (608) in the axial position; the reciprocating drive shaft (608) is provided with two groups of helical drive grooves (6081) connected in sequence on the surface; and the reciprocating drive shaft (608) is provided with a synchronous wheel A for power input at the end. The reciprocating drive shaft (608) is rotatably provided with two positioning shafts (609) at both ends; the reciprocating drive shaft (608) is externally provided with a drive shaft sleeve (6014); the drive shaft sleeve (6014) is connected with the two positioning shafts (609) by keys, and the drive shaft sleeve (6014) is rotatably provided with an engagement wedge (6010) on the inner wall; the drive shaft sleeve (6014) is provided with a connecting arc-shaped part (6011) fixedly connected with the anti-swing rotating frame (603) at both sides of the lower end.

3. A process for the manufacture of a fire resistant electrical cable according to claim 2, wherein, One of the unidirectional drive wheels (607) relatively close to the unwinding machine (1) is provided with a positioning groove A on the surface; and the other unidirectional drive wheel (607) relatively far from the unwinding machine (1) is of a variable diameter structure, and the other unidirectional drive wheel (607) relatively far from the unwinding machine (1) is provided with a positioning groove B on the surface. Moreover, the positioning groove B includes a plurality of connection grooves A and at least one misaligned groove. Moreover, the positioning groove A and the positioning groove B are staggered.

4. A process for manufacturing a fire resistant electrical cable according to claim 3, wherein, The surfaces of the two unidirectional drive wheels (607) are three-dimensionally "8"-shaped and are wound with copper conductors.

5. A process for the manufacture of a fire resistant electrical cable according to claim 4, wherein, The power output mechanism (7) includes a drive motor (701); the drive motor (701) is arranged at the top of the double-sided coating groove (5); the drive motor (701) is provided with a synchronous wheel B at the output end; and the reciprocating drive shaft (608) forms a transmission structure with the drive motor (701) through the synchronous wheel A, the synchronous wheel B and the synchronous belt.

6. A process for the manufacture of a fire resistant electrical cable according to claim 5, wherein, The double-sided coating groove (5) is fixedly provided with a comb-shaped poking plate (501) on the inner wall; the poking plate (501) is provided with a plurality of poking grooves (5011) at the end; the copper conductor moves axially along the reciprocating drive shaft (608), so that the copper conductor and the poking grooves (5011) are in movable contact to form a poking structure, so that the surface area of the copper conductor arranged in an inclined manner accumulates coating and falls off due to vibration.

7. A process for the manufacture of a fire resistant electrical cable according to claim 6, wherein, The method includes the following steps: S100: copper conductor drawing; drawing a copper rod with a diameter of 8 mm to a standard specification; S200: coating coating and drying treatment; the unwinding machine (1) carries out intermittent unwinding of adaptation, and uniform speed winding is carried out in cooperation with the winding equipment; in the process of pulling the copper conductor, the copper conductor is arranged on the two one-way driving wheels (607) by three-dimensional "8" winding in the process of copper conductor, and is limited through the positioning groove A, the connecting groove A and the staggered groove, then the power input of the power output mechanism (7) is input, so that the reciprocating driving shaft (608) rotates, so that the meshing wedge (6010) reciprocates along the spiral driving groove (6081), so that the driving shaft sleeve (6014) moves relative to both sides, at the same time, based on the movement of the driving shaft sleeve (6014), the connecting arc-shaped part (6011) and the rotating ratchet shaft part (605) are driven to rotate, and the spiral groove (6051) arranged in the rotating ratchet shaft part (605) is in contact with the extrusion teeth (6041), forming a cam structure, and in the ratchet engagement state, the one-way driving wheel (607) rotates, so that the one-way driving wheel (607) forms the state of intermittent one-way rotation and reciprocating movement on both sides; the copper conductor is intermittently turned over and transported in the three-dimensional "8" winding state, the copper conductor is coated with paint when it is at the bottom of the one-way driving wheel (607), and the copper conductor is dried and solidified when it moves obliquely at the top of the one-way driving wheel (607); S300: mica winding; the two-layer calcined mica tape is wound at a 50% overlap rate by the bidirectional self-adjusting mica winding mechanism (3); S400, sheath extrusion; after passing through the tensioning mechanism, an 80 type extruder is used to cover the low-smoke and halogen-free polyolefin sheath.

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