A cable painting production line

Abstract

The present invention discloses a cable painting production line, belonging 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 line comprises a wire-laying device (1), a painting device (2), a vertical drying device (3) and a wire-receiving device (5) which are arranged in sequence. The vertical drying device (3) comprises a drying gas supply device (32) and an upright drying pipeline (31). The drying gas supply device (32) can supply gas for drying the cable paint into the drying pipeline (31). The cable painting production line adopts a vertical layout of the drying pipeline, thereby eliminating the uneven wall-hanging phenomenon of the paint layer existing in the horizontal layout. The vertical layout effectively utilizes the vertical space and reduces 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 line. Background Art

[0002] Spraying covering paint on the cable surface is one of the effective ways to increase the mechanical strength, moisture resistance, oil resistance and corrosion resistance of the cable. The current traditional painting equipment adopts the "horizontal layout, horizontal immersion paint" method, combined with electric heating and drying equipment. This kind of painting equipment has the following defects:

[0003] 1. Due to the gravity factor, the horizontal dipping method often results in uneven paint layer hanging on the wall, especially a large number of "thin on top and thick on the bottom" phenomena.

[0004] 2. Considering the length of the production line, the traditional painting production line has a low production speed due to the efficiency of the drying equipment, which greatly affects the efficiency of product delivery.

[0005] 3. Electric heating drying equipment has the defects of high energy consumption, easy damage and high maintenance cost. Summary of the invention

[0006] In order to solve the above-mentioned "thin on top and thick on the bottom" problem existing in the existing horizontal layout of cable painting, the present invention provides a cable painting production line, which adopts a vertical layout of drying pipes, thereby eliminating the uneven wall hanging phenomenon of paint layer existing in the horizontal layout, and the vertical layout effectively utilizes the vertical space, reducing the area occupied by the construction of production plants.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A cable painting production line comprises a wire-releasing device, a painting device, a vertical drying device and a wire-receiving device which are arranged in sequence. The vertical drying device comprises a drying gas supply device and an upright drying pipeline. The drying gas supply device can supply gas for drying the cable paint into the drying pipeline.

[0009] The beneficial effects of the present invention are:

[0010] 1. The horizontal layout is more vertical, eliminating the uneven paint layer hanging on the wall in the horizontal layout. The vertical layout effectively utilizes the vertical space and reduces the area occupied by the production plant.

[0011] 2. The pay-off and take-up system is equipped with a double-groove guide wheel assembly for double pay-off and double pay-out, which can realize the production of two cables at the same time and double the production efficiency.

[0012] 3. The drying equipment adopts the method of steam + waste heat + secondary drying, which is more efficient and energy-saving than the electric heating method. The multiple step-by-step drying can effectively achieve the stability of the paint layer and avoid the cracking of the paint layer caused by sudden temperature changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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.

[0014] Figure 1 It is a main schematic diagram of the cable painting production line described in the present invention.

[0015] Figure 2 It is a schematic diagram of heating of the cable painting production line described in the present invention.

[0016] Figure 3 is a schematic diagram of a painting device.

[0017] Figure 4 It is a three-dimensional schematic diagram of the descending drying section.

[0018] Figure 5 It is a cross-sectional schematic diagram of the descending drying section.

[0019] Figure 6 It is a top view schematic diagram of a wire-releasing device and a wire-retrieving device.

[0020] The following are the descriptions of the reference numerals:

[0021] 1. Pay-off device; 2. Painting device; 3. Vertical drying equipment; 4. Secondary oven; 5. Take-up device; 6. Negative pressure exhaust system; 7. Waste heat exchange equipment; 8. Cable;

[0022] 11. Pay-off rack; 12. Pay-off reel; 13. First steering guide wheel;

[0023] 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;

[0024] 31. Drying pipeline; 32. Drying gas supply device; 33. Main steam pipeline; 34. Branch steam pipeline;

[0025] 41. third steering guide wheel; 42. fourth steering guide wheel;

[0026] 51. Take-up rack; 52. Take-up reel;

[0027] 61. Air vent;

[0028] 71. Secondary drying fan; 72. Waste heat exchanger; 73. Steam circulating water device; 74. Heat source supply pipeline;

[0029] 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;

[0030] 321. Steam hot air blower; 322. Steam heat exchanger. DETAILED DESCRIPTION

[0031] 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.

[0032] A cable painting production line comprises a pay-off device 1, a painting device 2, a vertical drying device 3 and a take-up device 5 which are arranged in sequence. The vertical drying device 3 comprises a drying gas supply device 32 and an upright drying pipe 31. The drying gas supply device 32 can supply gas for drying the cable painting into the drying pipe 31. After painting, the cable 8 can be dried in the drying pipe 31 in an upright state. Figure 1 and Figure 2 shown.

[0033] 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.

[0034] 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 shown.

[0035] 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 and 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 is also used to guide the cable 8 into the drying pipe 31.

[0036] In this embodiment, a self-priming pump 22 is provided on the paint delivery pipeline 23, and a non-contact liquid level sensor 24 is provided on the side wall of the paint tank 25. The cable painting production line also includes a control unit. 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.

[0037] 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 preset level by a certain deviation, 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.

[0038] 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.

[0039] 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.

[0040] In this embodiment, the cable painting production line 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.

[0041] 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.

[0042] 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 painting production line includes two drying gas supply devices 32 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.

[0043] The specific connection relationship is as follows:

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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)

[0048] In this embodiment, the cable painting production line further includes a secondary oven 4 and a waste heat exchange device 7, the waste heat exchange device 7 includes a secondary drying fan 71, a waste heat exchanger 72 and a steam circulating water device 73, the secondary oven 4 is located between the vertical drying device 3 and the wire take-up device 5, the cable 8 can enter the secondary oven 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 oven 4. The secondary oven 4 can be a vertical structure or a horizontal structure, that is, the (corresponding) cable 8 can move upright or horizontally in the secondary oven 4. Preferably, the secondary oven 4 is a horizontal structure, and the cable 8 can move horizontally in the secondary oven 4.

[0049] 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 oven 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.

[0050] 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 oven 4 by the secondary drying fan 71. The high-temperature air after heat absorption dries the cable 8 in the secondary drying oven 4.

[0051] It can be understood that the drying duct 31 dries the cable 8 for the first time, and the secondary oven 4 dries the cable 8 for the second time. A third steering guide wheel 41 is provided outside the inlet end of the secondary oven 4, and a fourth steering guide wheel 42 is provided outside the outlet end of the secondary oven 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.

[0052] 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 during actual production to feedback the deviation between the actual temperature and the preset temperature 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 adopts 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 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 exchanger 72 enters the secondary oven 4. Multiple sets of nozzles can be configured inside the secondary oven 4 to achieve secondary drying of the cable 8 after painting.

[0053] In this embodiment, the cable painting production line includes a negative pressure exhaust system 6, which includes multiple exhaust ports 61. The exhaust ports 61 correspond to the main production devices that can produce volatile substances. For example, the multiple exhaust ports 61 correspond to the painting device 2, the vertical drying device 3, the secondary oven 4 and the take-up device 5. The negative pressure exhaust system 6 also includes a negative pressure exhaust fan. The negative pressure exhaust fan is used in conjunction with environmental protection equipment to perform 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 2 shown.

[0054] The working process of the cable painting production line is introduced below.

[0055] 1. After the pay-off device 1 releases the cable 8, the cable 8 enters the paint tank 25 of the painting device 2 for painting.

[0056] 2. The painted cable 8 enters the ascending drying section 311 and the descending drying section 312 of the vertical drying device 3 in sequence, and the cable 8 completes a drying process.

[0057] 3. After the primary drying, the cable 8 enters the secondary drying oven 4 to complete the secondary drying.

[0058] 4. The cable 8 after secondary drying is reeled up by the reeling device 5.

[0059] 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.

[0060] 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 cable painting production line, characterized in that: The cable painting production line comprises a wire unwinding device (1), a painting device (2), a vertical drying device (3) and a wire 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 pipeline (31). The drying gas supply device (32) can supply gas for drying the cable paint 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 cable painting production line further comprises a main steam pipeline (33). 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 a 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 a heat absorption medium inlet of the steam heat exchanger (322). The drying gas inlet of the descending drying section (312) is connected to a heat absorption medium outlet of the steam heat exchanger (322). The cable coating production line further comprises a secondary drying oven (4) and a waste heat exchange device (7). 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 oven (4) is located between the vertical drying device (3) and the wire take-up device (5). The cable (8) can enter the secondary drying oven (4) after leaving the vertical drying device (3). The outlet of the secondary drying fan (71) is connected to the heat absorbing medium inlet of the waste heat exchanger (72). The drying gas inlet of the box (4) is in communication with the heat absorbing medium outlet of the waste heat exchanger (72), the main steam pipeline (33) is in communication with the first heat releasing medium inlet of the waste heat exchanger (72), the heat releasing medium outlet of the steam heat exchanger (322) is in communication with 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 in communication with the heat releasing medium outlet of the waste heat exchanger (72).

2. The cable painting production line according to claim 1, 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 cable painting production line according to claim 1, characterized in that: The painting device (2) comprises a paint storage tank (21), a paint delivery pipeline (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 pipeline (31).

4. The cable painting production line according to claim 3 is characterized in that: A self-priming pump (22) is provided on the paint delivery pipeline (23), and a non-contact liquid level sensor (24) is provided on the side wall of the paint tank (25). 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).

5. The cable painting production line according to claim 1, 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).

6. The cable painting production line according to claim 5, 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).

7. The cable painting production line according to claim 1, 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 cable painting production line according to claim 1, characterized in that: The cable painting production line comprises a negative pressure exhaust system (6), the negative pressure exhaust system (6) comprises a plurality of exhaust ports (61), and the plurality of exhaust ports (61) correspond one by one to the painting device (2), the vertical drying device (3), the secondary drying oven (4) and the wire take-up device (5).

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