A cable coating production method

Abstract

The present invention discloses a cable painting production method, which belongs to the field of cable production. In order to solve the problem of uneven thickness of the paint layer on the cable surface, the cable painting production method comprises the following steps: step 1, releasing the cable (8); step 2, coating the cable (8) with paint liquid in a painting device (2); step 3, drying the cable (8) in an upright state in a vertical drying device (3); step 4, drying the cable (8) in a secondary drying box (4); step 5, winding the cable (8). The cable painting production method adopts a vertical cable drying method, which eliminates the uneven wall hanging phenomenon of the paint layer existing in the horizontal layout, and the vertical drying can effectively utilize the vertical space and reduce the area occupied by the production plant.

Description

Technical Field

[0001] The invention relates to the technical field of cable production, in particular to a cable painting production method. Background Art

[0002] The current painting method is horizontal wiring with dipping method. Due to the fluidity of the paint liquid and the paint liquid on the cable surface will spread from the upper layer to the lower layer under the action of gravity, so the lower layer will gather more paint liquid, and after the paint liquid dries after passing through the horizontal drying device, the thickness of the upper and lower paint layers will be uneven; this painting method will cause the thickness of the paint layer on the upper and lower surfaces of the painted product to be inconsistent, resulting in uneven thickness of the overall painted surface, and the surface of the cable product will have obvious color difference problems. Summary of the invention

[0003] In order to solve the problem of inconsistent paint layer thickness in existing cable painting, the present invention provides a cable painting production method, which adopts a vertical cable drying method, thereby eliminating the uneven wall hanging phenomenon of the paint layer in the horizontal layout, and the vertical layout effectively utilizes the vertical space and reduces the area occupied by the production plant.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A cable painting production method, the cable painting production method adopts a cable painting production line, the cable painting production line comprises a wire-laying device, a painting device, a vertical drying device, a secondary drying box and a wire-reeling device which are arranged in sequence, the vertical drying device comprises a drying gas supply device and a vertical drying pipeline, the drying gas supply device can supply gas for drying the cable painting into the drying pipeline;

[0006] The cable coating production method comprises the following steps:

[0007] Step 1: The pay-off device pays out the cable;

[0008] Step 2: The cable is coated with paint in a painting device;

[0009] Step 3: The cable moves in an upright state in a vertical drying device and is dried;

[0010] Step 4: The cable is dried in a secondary drying box;

[0011] Step 5: The take-up device reels the cable.

[0012] The beneficial effects of the present invention are:

[0013] 1. After the cable is coated with paint in the paint tank and then passes through the vertical drying equipment and the secondary drying box in sequence, a more uniform coating effect can be achieved.

[0014] 2. By setting the limit ring, it can scrape off excess paint, making the paint layer on the cable surface more uniform. It can also collect excess paint, increase the recycling of paint, and achieve a more energy-saving effect.

[0015] 3. After being heated and cured by multiple drying devices (vertical drying equipment and secondary drying box), the thickness of the paint layer on the upper and lower surfaces of the cable is relatively uniform, and the problem of stickiness and roughness on the surface of the product is effectively reduced.

[0016] 4. It can realize the simultaneous production of multiple cables, improve production efficiency, reduce costs and save energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 It is a main schematic diagram of the cable painting production line described in the present invention.

[0019] Figure 2 It is a schematic diagram of heating of the cable painting production line described in the present invention.

[0020] Figure 3 is a schematic diagram of a painting device.

[0021] Figure 4 It is a three-dimensional schematic diagram of the descending drying section.

[0022] Figure 5 It is a cross-sectional schematic diagram of the descending drying section.

[0023] Figure 6 It is a top view schematic diagram of a wire-releasing device and a wire-retrieving device.

[0024] The following are the descriptions of the reference numerals:

[0025] 1. Pay-off device; 2. Painting device; 3. Vertical drying equipment; 4. Secondary drying box; 5. Take-up device; 6. Negative pressure exhaust system; 7. Waste heat exchange equipment; 8. Cable;

[0026] 11. Pay-off rack; 12. Pay-off reel; 13. First steering guide wheel;

[0027] 21. Paint storage tank; 22. Self-priming pump; 23. Paint delivery pipeline; 24. Non-contact liquid level sensor; 25. Paint tank; 26. Paint guide wheel; 27. Limit ring;

[0028] 31. Drying pipeline; 32. Drying gas supply device; 33. Main steam pipeline; 34. Branch steam pipeline;

[0029] 41. third steering guide wheel; 42. fourth steering guide wheel;

[0030] 51. Take-up rack; 52. Take-up reel;

[0031] 61. Air vent;

[0032] 71. Secondary drying fan; 72. Waste heat exchanger; 73. Steam circulating water device; 74. Heat source supply pipeline;

[0033] 311, ascending drying section; 312, descending drying section; 313, second steering guide wheel; 314, inner layer; 315, middle layer; 316, outer layer; 317, inner spiral groove; 318, outer spiral groove;

[0034] 321. Steam hot air blower; 322. Steam heat exchanger. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] A cable painting production method, the cable painting production method adopts a cable painting production line, the cable painting production line comprises a pay-off device 1, a painting device 2, a vertical drying device 3, a secondary blow-drying box 4 and a take-up device 5 which are arranged in sequence, the vertical drying device 3 comprises a drying gas supply device 32 and a vertical drying pipe 31, the drying gas supply device 32 can supply gas for drying the cable painting into the drying pipe 31;

[0037] The cable coating production method comprises the following steps:

[0038] Step 1, the pay-off device 1 pays out the cable 8;

[0039] Step 2: The cable 8 is coated with paint liquid in the painting device 2;

[0040] Step 3, the cable 8 moves in an upright state in the vertical drying device 3 and is dried;

[0041] Step 4, the cable 8 is dried in the secondary drying box 4;

[0042] Step 5: The take-up device 5 reels the cable 8.

[0043] In this embodiment, the wire-unwinding device 1 is a double-unwinding structure, which includes two wire-unwinding frames 11 and two wire-unwinding reels 12 arranged side by side, and one wire-unwinding reel 12 is located on one wire-unwinding frame 11. A first steering guide wheel 13 is provided between the wire-unwinding device 1 and the painting device 2. The wire-receiving device 5 is a double-receiving structure, which includes two wire-receiving frames 51 and two wire-receiving reels 52 arranged side by side, and one wire-receiving reel 52 is located on one wire-receiving frame 51.

[0044] The axis of the pay-off drum 12, the axis of the first steering guide wheel 13 and the axis of the take-up drum 52 are all in a horizontal state. The function of the first steering guide wheel 13 is to guide the cable 8 into the painting device 2. Overall, through the "double pay-off and double take-up" method, two cables 8 can be produced at the same time, doubling the production efficiency. Figure 6 The pay-off device 1 can realize active pay-off and passive pay-off.

[0045] In this embodiment, the painting device 2 comprises a paint storage tank 21, a paint delivery pipe 23 and a paint tank 25 which are connected in sequence. A paint guide wheel 26 is provided in the paint tank 25. The paint guide wheel 26 is located below the drying pipe 31. The paint guide wheel 26 is used to press the cable 8 into the paint liquid in the paint tank 25 (painting the surface of the cable 8), and the paint guide wheel 26 is also used to guide the cable 8 into the drying pipe 31.

[0046] In this embodiment, a self-priming pump 22 is provided on the paint delivery pipe 23, and a non-contact liquid level sensor 24 is provided on the side wall of the paint tank 25. The cable painting production method also includes a control unit, and the self-priming pump 22 and the non-contact liquid level sensor 24 are both connected to the control unit. The non-contact liquid level sensor 24 can start and stop the self-priming pump 22 according to the detected liquid level in the paint tank 25. Figure 3 shown.

[0047] The non-contact liquid level sensor 24 is used to detect the liquid level of the paint in the paint tank 25. When the liquid level reaches a preset level, the vertical self-priming pump 22 stops running; when the liquid level is lower than a certain deviation from the preset level, the control unit starts the vertical self-priming pump 22 to supply paint, so that the paint in the paint storage tank 21 enters the paint tank 25 through the paint delivery pipe 23, ensuring that the liquid level in the paint tank 25 is stable.

[0048] A height adjustment structure and an automatic stirrer are also provided in the paint tank 25. The height adjustment structure can adjust the vertical position of the paint guide wheel 26. The height adjustment structure is a multi-stage slot, and the paint guide wheel 26 is connected to the multi-stage slot. The paint guide wheel 26 is higher than the edge of the paint tank 25. A plurality of tapered tubes are provided at the bottom of the paint tank 25. The tapered tubes are connected to the bottom of the paint tank 25. The paint tank 25 is connected to the paint delivery pipeline 23 through the tapered tubes. The aperture of the tapered tube away from the paint tank 25 is smaller than the aperture of the tapered tube toward the paint tank 25.

[0049] The paint tank 25 can store a certain concentration of paint (the thinner and the paint are uniformly mixed in a ratio of 1.3:1-1.5:1), and an automatic stirrer is installed inside the paint tank 25 to maintain the fluidity and a certain concentration of the paint liquid in the paint tank 25; the multi-stage card slot can adjust the height of the paint guide wheel 26, thereby adjusting the relative height of the paint guide wheel 26 and the paint liquid level in the paint tank 25, so as to ensure that the paint guide wheel 26 has a 1 / 3 position height within the paint liquid level, and ensure that the paint line (i.e., the electric Cable 8) can be completely immersed in liquid to ensure that there is a sufficient paint layer on the painting line, and at the same time, the amount of paint can be reduced at the end of the later painting production; when conveying the painting line, the painting line can be completely painted after passing through the first steering guide wheel 13 and the painting guide wheel 26, so that the surface of the painting line has a more uniform coating of paint; the height of the fixed painting guide wheel 26 on one side of the paint tank 25 needs to be higher than the side edge of the paint tank, and can carry 10mm-50mm cables through; the tapered tube device at the bottom of the paint tank 25 can facilitate the discharge of excess paint from the paint tank.

[0050] In this embodiment, a limiting ring 27 is provided between the vertical drying device 3 and the paint tank 25, and the cable 8 passes through the limiting ring 27. The inner diameter of the upper end of the limiting ring 27 is larger than the inner diameter of the lower end of the limiting ring 27, and the inner diameter of the lower end of the limiting ring 27 corresponds to the outer diameter of the cable 8. The limiting ring 27 can scrape off the excess paint liquid on the surface of the cable 8, and the excess paint liquid can fall back into the paint tank 25. The material of the limiting ring 27 can be metal or engineering plastic (such as nylon), and step 2 includes the following steps:

[0051] Step 2.1, the cable 8 is coated with paint in the paint tank 25;

[0052] Step 2.2, the cable 8 passes through the limiting ring 27 and enters the vertical drying equipment 3.

[0053] In this embodiment, the drying duct 31 includes an ascending drying section 311 and a descending drying section 312 which are arranged in sequence. The ascending drying section 311 and the descending drying section 312 are both upright tubular structures. The descending drying section 312 and the ascending drying section 311 are arranged symmetrically. A second steering guide wheel 313 is arranged between the ascending drying section 311 and the descending drying section 312. The cable 8 leaving the ascending drying section 311 can bypass the second steering guide wheel 313 and enter the descending drying section 312. Figure 1 and Figure 2 shown.

[0054] After the cable 8 is painted on the inner surface of the paint tank 25, the cable 8 first enters the ascending drying section 311, in which the cable 8 is in an upright state and moves upright upward in the ascending drying section 311; then the cable 8 enters the descending drying section 312, in which the cable 8 is in an upright state and moves upright downward in the descending drying section 312. The function of the second steering guide wheel 313 is to change the moving direction of the cable 8. That is, step 3 includes the following steps:

[0055] Step 3.1, the cable 8 moves upward in an upright state in the ascending drying section 311 and is dried;

[0056] Step 3.2: The cable 8 moves downward in an upright state in the descending drying section 312 and is dried.

[0057] A temperature sensor is provided in the drying duct 31 to monitor and adjust the temperature at all times to ensure that the temperature in the drying duct 31 is within the range of 85±15°C. In the vertical direction, the limit ring 27 is located between the rising drying section 311 and the paint tank 25. The limit ring 27 is fixed to the outside of the rising drying section 311, the limit ring 27 is located directly below the rising drying section 311, and the limit ring 27 is located directly above the paint guide wheel 26. The cable 8 passes through the limit ring 27 in a vertical state and enters the vertical drying device 3.

[0058] During painting, the paint liquid is still mainly liquid. When the painted line is formed, the paint layer needs to be heated to solidify the paint layer. The cable 8 enters the ascending drying section 311 in a vertical upright state, and uses the paint's own weight to flow the excess paint liquid vertically downward back to the paint tank 25. At the same time, the paint layer is heated through the drying pipe 31 to facilitate the solidification of the paint layer and make the paint layer uniform. When the cable 8 coated with the paint layer passes through the limit ring 27 for the first time, the limit ring 27 adopts a conical shape. The end of the limit ring 27 with a large aperture can facilitate the entry of the paint line into the limit ring 27, and the end of the limit ring 27 with a small aperture can scrape off excess paint on the surface of the paint line, so that the paint layer on the surface of the paint line is more uniform. At the same time, the vertical method can also collect excess paint, which is more energy-saving.

[0059] In this embodiment, the cable painting production method also includes a main steam pipeline 33, and the drying gas supply device 32 includes a steam hot air blower 321 and a steam heat exchanger 322 (also referred to as a steam heat exchange pipeline). The steam heat exchanger 322 can be an existing gas-steam heat exchanger. The main steam pipeline 33 is connected to the heat release medium inlet of the steam heat exchanger 322 through a branch steam pipeline 34, and the outlet of the steam hot air blower 321 is connected to the heat absorption medium inlet of the steam heat exchanger 322. The drying gas inlet of the descending drying section 312 is connected to the heat absorption medium outlet of the steam heat exchanger 322, and the drying gas inlet of the descending drying section 312 is connected to the heat absorption medium outlet of the steam heat exchanger 322. The Y-type three-way structure is used to connect the drying gas inlet of the descending drying section 312 and the heat absorption medium outlet of the steam heat exchanger 322. Figure 2 and Figure 5 shown.

[0060] The steam in the branch steam pipe 34 releases heat in the steam heat exchanger 322, and the air blown out by the steam hot air blower 321 absorbs heat in the steam heat exchanger 322. The high-temperature air after absorbing heat is blown into the drying pipe 31 (the descending drying section 312 and the ascending drying section 311) by the steam hot air blower 321. The high-temperature air after absorbing heat dries the cable 8 in the drying pipe 31, thereby accelerating the drying and solidification of the surface paint layer of the cable 8.

[0061] The connection mode of the drying gas supply device 32 with the descending drying section 312 is the same as the connection mode of the drying gas supply device 32 with the ascending drying section 311. That is, the cable coating production method includes two drying gas supply devices 32 connected in parallel, the two drying gas supply devices 32 are respectively connected to the descending drying section 312 and the ascending drying section 311, and the two drying gas supply devices 32 supply high-temperature air to the descending drying section 312 and the ascending drying section 311 respectively.

[0062] The specific connection relationship is as follows:

[0063] In the first drying gas supply device 32, the connection relationship between the drying gas supply device 32 and the descending drying section 312 is: the main steam pipe 33 is connected to the heat release medium inlet of the steam heat exchanger 322 through the branch steam pipe 34, the outlet of the steam hot air blower 321 is connected to the heat absorption medium inlet of the steam heat exchanger 322, and the drying gas inlet of the descending drying section 312 is connected to the heat absorption medium outlet of the steam heat exchanger 322.

[0064] In the second drying gas supply device 32, the connection relationship between the drying gas supply device 32 and the ascending drying section 311 is: the main steam pipe 33 is connected to the heat release medium inlet of the steam heat exchanger 322 through the branch steam pipe 34, the outlet of the steam hot air blower 321 is connected to the heat absorption medium inlet of the steam heat exchanger 322, and the drying gas inlet of the ascending drying section 311 is connected to the heat absorption medium outlet of the steam heat exchanger 322.

[0065] In this embodiment, the structures of the descending drying section 312 and the ascending drying section 311 are basically the same. The drying duct 31 comprises an inner layer 314, a middle layer 315 and an outer layer 316 which are sequentially arranged from the inside to the outside, that is, the descending drying section 312 and the ascending drying section 311 both comprise an inner layer 314, a middle layer 315 and an outer layer 316 which are sequentially arranged from the inside to the outside. The inner surface of the inner layer 314 is provided with an inner spiral groove 317, the material of the middle layer 315 is an inorganic heat-insulating material (such as rock wool or glass wool), and the outer surface of the outer layer 316 is provided with an outer spiral groove 318, such as Figure 4 shown.

[0066] The drying gas inlet of the ascending drying section 311 is located at the upper part of the ascending drying section 311, and the high-temperature air can spirally descend in the ascending drying section 311 (the inner spiral groove 317 in the ascending drying section 311 enables) The drying gas inlet of the descending drying section 312 is located at the lower part of the descending drying section 312, and the high-temperature air can spirally ascend in the descending drying section 312 (the inner spiral groove 317 in the descending drying section 312 enables)

[0067] In this embodiment, the cable painting production line further includes a waste heat exchange device 7, which includes a secondary drying fan 71, a waste heat exchanger 72 and a steam circulating water device 73. The secondary drying box 4 is located between the vertical drying device 3 and the wire take-up device 5. The cable 8 can enter the secondary drying box 4 after leaving the vertical drying device 3, and the cable 8 can be reeled by the wire take-up device 5 after leaving the secondary drying box 4. The secondary drying box 4 can be a vertical structure or a horizontal structure, that is, the (corresponding) cable 8 can move upright or horizontally in the secondary drying box 4. Preferably, the secondary drying box 4 is a horizontal structure, and the cable 8 can move horizontally in the secondary drying box 4. In step 4, the cable 8 moves horizontally in the secondary drying box 4 and is dried.

[0068] In this embodiment, the waste heat exchanger 72 can be an existing gas-steam heat exchanger, the outlet of the secondary drying fan 71 is connected to the heat absorption medium inlet of the waste heat exchanger 72, the drying gas inlet of the secondary blow drying box 4 is connected to the heat absorption medium outlet of the waste heat exchanger 72, the main steam pipeline 33 is connected to the first heat release medium inlet of the waste heat exchanger 72, the heat release medium outlet of the steam heat exchanger 322 is connected to the second heat release medium inlet of the waste heat exchanger 72, and the third heat release medium inlet of the waste heat exchanger 72 is externally connected to a heat source supply pipeline 74, and the heat source supply pipeline 74 can be connected to other heat sources. The inlet of the steam circulating water device 73 is connected to the heat release medium outlet of the waste heat exchanger 72. The steam circulating water device 73 can adopt existing technology products. The steam circulating water device 73 can convert the steam after heat release into water, heat the water into steam, and then enter the main steam pipeline 33, thereby forming a steam-water cycle.

[0069] The steam after heat release from the steam heat exchanger 322 can enter the waste heat heat exchanger 72 to release heat, the steam in the main steam pipe 33 can enter the waste heat heat exchanger 72 to release heat, and other heat sources can also enter the waste heat exchanger 72 to release heat. The air blown out by the secondary drying fan 71 absorbs heat in the waste heat exchanger 72, and the high-temperature air after heat absorption is blown into the secondary drying box 4 by the secondary drying fan 71. The high-temperature air after heat absorption dries the cable 8 in the secondary drying box 4.

[0070] It can be understood that the drying duct 31 dries the cable 8 for the first time, and the secondary drying box 4 dries the cable 8 for the second time. A third steering guide wheel 41 is provided outside the inlet end of the secondary drying box 4, and a fourth steering guide wheel 42 is provided outside the outlet end of the secondary drying box 4. The third steering guide wheel 41 and the fourth steering guide wheel 42 are used to guide the cable 8 to change the direction of travel. The axis of the third steering guide wheel 41 and the axis of the fourth steering guide wheel 42 are both in a horizontal state. The inlet portion of the third steering guide wheel 41 is located directly below the descending drying section 312, and the outlet portion of the paint guide wheel 26 is located directly below the ascending drying section 311.

[0071] The hot air control system mainly controls the internal temperature of the primary and secondary drying equipment. The primary drying equipment adopts the PID control mode. First, the temperature control of the machine is realized by presetting the temperature of the drying equipment. The subsequent drying equipment uses the temperature sensor to feedback the actual temperature and the preset temperature deviation during actual production as the input of the PLC control module. The fan speed and air volume are controlled according to the deviation value to reduce the deviation value, and finally the purpose of stable temperature control of the primary drying equipment is achieved. The secondary drying equipment uses the waste heat equipment to connect the air compressor to blow air to increase the drying time, and the graded drying can effectively avoid the cracking of the paint layer caused by the sudden change of temperature. For the steam after the primary drying, the heat exchange is completed through the waste heat heat exchanger 72. The heat exchange equipment is equipped with a solenoid valve, which can increase the external waste heat source (and other heat sources) to ensure the heat exchange effect. The high-temperature gas after absorbing heat in the waste heat heat exchanger 72 enters the secondary drying box 4. Multiple sets of nozzles can be configured inside the secondary drying box 4 to achieve secondary drying of the cable 8 after painting.

[0072] In this embodiment, the cable painting production method includes a negative pressure exhaust system 6, which includes a plurality of exhaust ports 61. The exhaust ports 61 correspond to the main production devices that can produce volatile substances. For example, the plurality of exhaust ports 61 correspond to the painting device 2, the vertical drying device 3, the secondary drying box 4 and the take-up device 5. The negative pressure exhaust system 6 also includes a negative pressure exhaust fan, which is used in conjunction with environmental protection equipment for compliance emission control, mainly to eliminate the paint smell in the workshop and achieve the purpose of environmentally friendly emissions, such as Figure 1 and Figure 2The negative pressure exhaust system 6 includes an exhaust fan, and the exhaust fan device is connected to the workshop air duct, and the air duct is connected to the unpowered wind hood of the workshop environmental protection equipment.

[0073] In order to facilitate understanding and description, the present invention adopts absolute position relationship for expression. Unless otherwise specified, the directional word "up" means Figure 1 The direction of the upper side, "down" means Figure 1 The direction of the lower side, "left" means Figure 1 The direction to the left of Figure 1 The present invention adopts the observation angle of the reader or user for description, but the above directional words cannot be understood or interpreted as limiting the protection scope of the present invention.

[0074] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with technical features and technical solutions, with technical solutions and embodiments.

Claims

1. A production method for cable painting using a cable painting production line, characterized in that: The cable painting production line comprises a pay-off device (1), a painting device (2), a vertical drying device (3), a secondary drying box (4) and a take-up device (5) which are arranged in sequence. The cable painting production line also comprises a waste heat exchange device (7) and a main steam pipeline (33); the vertical drying device (3) comprises a drying gas supply device (32) and a vertical drying pipeline (31); the drying gas supply device (32) can supply gas for drying the cable painting into the drying pipeline (31); the drying pipeline (31) comprises an ascending drying section (311) and a descending drying section (312) which are arranged in sequence; the drying gas supply device (32) comprises a steam hot air blower (321) and a steam heat exchanger (322); the main steam pipeline (33) is connected to the heat release medium inlet of the steam heat exchanger (322) through a branch steam pipeline (34); the outlet of the steam hot air blower (321) is connected to the heat absorption medium inlet of the steam heat exchanger (322); the drying gas inlet of the descending drying section (312) is connected to the heat absorption medium inlet of the steam heat exchanger (322); The outlet of the secondary drying fan (71) is connected to the outlet of the heat absorbing medium of the steam heat exchanger (322); the waste heat exchange device (7) comprises a secondary drying fan (71), a waste heat exchanger (72) and a steam circulating water device (73); the secondary drying box (4) is located between the vertical drying device (3) and the wire take-up device (5); the cable (8) can enter the secondary drying box (4) after leaving the vertical drying device (3); the outlet of the secondary drying fan (71) is connected to the inlet of the heat absorbing medium of the waste heat exchanger (72); the secondary drying box ( 4) is connected to the heat absorbing medium outlet of the waste heat exchanger (72), the main steam pipeline (33) is connected to the first heat releasing medium inlet of the waste heat exchanger (72), the heat releasing medium outlet of the steam heat exchanger (322) is connected to the second heat releasing medium inlet of the waste heat exchanger (72), the third heat releasing medium inlet of the waste heat exchanger (72) is externally connected to a heat source supply pipeline (74), and the inlet of the steam circulating water device (73) is connected to the heat releasing medium outlet of the waste heat exchanger (72); The production method of cable painting using a cable painting production line comprises the following steps: Step 1, the pay-off device (1) pays out the cable (8); Step 2: The cable (8) is coated with paint liquid in the painting device (2); Step 3, the cable (8) moves in an upright state in the vertical drying device (3) and is dried; Step 4, the cable (8) is dried in the secondary drying box (4); Step 5: The cable take-up device (5) takes up the cable (8).

2. The production method for cable painting using a cable painting production line according to claim 1 is characterized in that: The wire-releasing device (1) is a double-releasing structure, comprising two wire-releasing frames (11) and two wire-releasing reels (12), a first steering guide wheel (13) is provided between the wire-releasing device (1) and the painting device (2), and the wire-receiving device (5) is a double-receiving structure, comprising two wire-receiving frames (51) and two wire-receiving reels (52).

3. The production method for cable painting using a cable painting production line according to claim 1 is characterized in that: The painting device (2) comprises a paint storage tank (21), a paint delivery pipe (23) and a paint trough (25) which are connected in sequence. A paint guide wheel (26) and a height adjustment structure are provided in the paint trough (25). The paint guide wheel (26) is located below the drying pipe (31). The height adjustment structure can adjust the position of the paint guide wheel (26) in the vertical direction.

4. The production method for cable painting using a cable painting production line according to claim 3 is characterized in that: A limiting ring (27) is provided between the vertical drying device (3) and the paint tank (25), and the cable (8) passes through the limiting ring (27). The inner diameter of the upper end of the limiting ring (27) is larger than the inner diameter of the lower end of the limiting ring (27), and the inner diameter of the lower end of the limiting ring (27) corresponds to the outer diameter of the cable (8). The limiting ring (27) can scrape off excess paint liquid on the surface of the cable (8), and the excess paint liquid can fall back into the paint tank (25); Step 2 contains the following steps: Step 2.1, the cable (8) is coated with paint in a paint tank (25); Step 2.2: The cable (8) passes through the limiting ring (27) and enters the vertical drying device (3).

5. The production method for cable painting using a cable painting production line according to claim 1 is characterized in that: The ascending drying section (311) and the descending drying section (312) are both in an upright state, the descending drying section (312) and the ascending drying section (311) are arranged symmetrically, and a second steering guide wheel (313) is arranged between the ascending drying section (311) and the descending drying section (312), so that the cable (8) leaving the ascending drying section (311) can bypass the second steering guide wheel (313) and then enter the descending drying section (312); Step 3 contains the following steps: Step 3.1, the cable (8) moves upward in an upright state in the ascending drying section (311) and is dried; Step 3.2: The cable (8) moves downward in an upright state in the descending drying section (312) and is dried.

6. The production method for cable painting using a cable painting production line according to claim 5 is characterized in that: The connection method of the drying gas supply device (32) and the descending drying section (312) is the same as the connection method of the drying gas supply device (32) and the ascending drying section (311); the drying gas inlet of the ascending drying section (311) is located at the upper part of the ascending drying section (311), and the drying gas inlet of the descending drying section (312) is located at the lower part of the descending drying section (312).

7. The production method for cable painting using a cable painting production line according to claim 1 is characterized in that: The drying pipe (31) comprises an inner layer (314), a middle layer (315) and an outer layer (316) which are arranged in sequence from the inside to the outside. The inner surface of the inner layer (314) is provided with an inner spiral groove (317). The material of the middle layer (315) is an inorganic thermal insulation material. The outer surface of the outer layer (316) is provided with an outer spiral groove (318).

8. The production method for cable painting using a cable painting production line according to claim 1 is characterized in that: The cable painting production line further comprises a negative pressure exhaust system (6), the negative pressure exhaust system (6) comprising a plurality of exhaust ports (61), the plurality of exhaust ports (61) corresponding one by one to the painting device (2), the vertical drying device (3), the secondary drying box (4) and the wire take-up device (5).

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