Painting equipment for reducing paint layer stress of enameled copper flat wire

Abstract

The utility model discloses a lacquering device for reducing the stress of a paint layer of an enameled copper flat wire, which comprises a box body, a first chamber, a second chamber, a third chamber and a fourth chamber are sequentially arranged in the box body from top to bottom, a smoke exhaust pipe is arranged at the top of the first chamber, N + 1 upper guide wheels which are horizontally distributed are arranged in the first chamber, and N + 1 lower guide wheels are arranged in the fourth chamber. N horizontally-distributed upper guide wheels are arranged in the first bin, N horizontally-distributed lower guide wheels are arranged in the fourth bin, heaters are arranged in the second bin and the third bin, the copper flat wire enters the first bin, alternately bypasses the upper guide wheels and the lower guide wheels and then leaves the first bin, N-1 painting devices are arranged in the first bin, and N is larger than or equal to 1. The (N-1) painting devices are located below the wire outlet sides of the second upper guide wheel to the (N-1) th upper guide wheel respectively. The utility model has the advantages of reduced production line length, improved enameled wire yield, reduced paint layer stress and low energy consumption.

Description

Technical Field

[0001] The utility model belongs to the field of enameled copper flat wires, and in particular relates to a painting device for reducing the stress of a paint layer of the enameled copper flat wires. Background Art

[0002] Enameled copper flat wire (enameled wire for short) is widely used in the hub motors of new energy vehicles. With the development of new energy vehicles, more and more high-power hub motors have been developed. High-power hub motors have put forward more stringent requirements on the electrical performance of enameled wire, including the electrical performance of the paint film on the outer layer of the enameled wire (including voltage resistance, corona resistance, etc.).

[0003] In order to improve the electrical performance of the paint film, the common practice is to increase the thickness of the paint film. The current method of increasing the thickness of the paint film is usually to increase the number of times the enameled wire is painted on the production line. The movement direction of the enameled wire is basically horizontal, but each additional coat of paint requires a corresponding set of painting equipment and drying equipment, resulting in a very long production line for the enameled wire, which is not conducive to site layout.

[0004] The paint currently used has a low solid content (about 30%), which is mainly to make the paint have good self-leveling properties and form a paint film with relatively uniform thickness. However, compared with round-core enameled wire, flat-core enameled wire has edges and corners. When the paint self-levels, there is greater resistance at the edges and corners, which will still lead to uneven distribution of paint film thickness. Under the action of gravity, the paint will be concentrated on the two edges at the bottom of the enameled wire, resulting in a low yield of the enameled wire.

[0005] Existing enameled wires are painted at room temperature and then immediately put into an oven for high-temperature drying. After drying, they leave the oven and are immediately exposed to cold air. Under the blowing of cold air, the paint film on the enameled wire undergoes a rapid cooling process, which easily generates stress and causes the paint film to crack easily. Utility Model Content

[0006] The purpose of the utility model is to provide a painting device for reducing the stress of the paint layer of enameled copper flat wire. The utility model has the advantages of reducing the length of the production line, improving the yield rate of the enameled wire, reducing the stress of the paint layer and having low energy consumption.

[0007] The technical solution of the present utility model is: a painting equipment for reducing the stress of the paint layer of enameled copper flat wire, comprising a box body, in which a first chamber, a second chamber, a third chamber and a fourth chamber are arranged in sequence from top to bottom, a smoke exhaust pipe is provided on the top of the first chamber, N+1 horizontally distributed upper guide wheels are provided in the first chamber, N horizontally distributed lower guide wheels are provided in the fourth chamber, the second chamber and the third chamber are both provided with heaters, the copper flat wire enters the first chamber, alternately bypasses the upper guide wheels and the lower guide wheels, and then leaves the first chamber, N-1 painting devices are provided in the first chamber, and the N-1 painting devices are respectively located below the outlet side of the 2nd to N-1th upper guide wheels.

[0008] In the aforementioned painting equipment for reducing the stress of the paint layer of the enameled copper flat wire, a dehumidification pipe is provided on the outside of the box, both ends of the dehumidification pipe are connected to the second chamber, and a first fan and a dehumidification filter are provided on the dehumidification pipe.

[0009] In the aforementioned painting equipment for reducing the stress of the paint layer of the enameled copper flat wire, the first chamber is provided with a first air inlet, the smoke exhaust pipe is provided with a second fan, and the fourth chamber is provided with a second air inlet.

[0010] In the aforementioned painting equipment for reducing the stress of the paint layer of the enameled copper flat wire, the painting device includes a paint overflow box with an opening at the top, a paint block is provided in the middle of the paint overflow box, and a wire passing hole is provided vertically on the paint block. The upper and lower ends of the wire passing hole are both trumpet-shaped, and the middle of the wire passing hole shrinks inward to form a wire passing hole that cooperates with the copper flat wire. A paint touch-up tube with one end extending out of the box is provided on the upper side of the wire passing hole.

[0011] In the aforementioned painting equipment for reducing the stress of the paint layer of the enameled copper flat wire, a power compensation mechanism is provided in the first chamber and the fourth chamber, which is used to provide rotation assistance to the upper guide wheel or the lower guide wheel to reduce the movement resistance of the copper flat wire on the upper guide wheel or the lower guide wheel.

[0012] In the aforementioned painting equipment for reducing the stress of the paint layer of the enameled copper flat wire, the power compensation mechanism includes a first bracket plate and a second bracket plate both fixed to the box body, the first bracket plate and the second bracket plate are parallel to each other, and multiple rotating shafts are provided between the first bracket plate and the second bracket plate, one end of the rotating shaft extends out of the first bracket plate and is connected to the upper guide wheel or the lower guide wheel, a pulley mechanism is provided between adjacent rotating shafts, and a motor with an output end connected to one of the rotating shafts is provided on the second bracket plate.

[0013] In the aforementioned painting equipment for reducing the stress of the paint layer of the enameled copper flat wire, the rotating shaft is connected to the upper guide wheel or the lower guide wheel bearing, and the end of the rotating shaft is provided with a magnetic disk close to the upper guide wheel or the lower guide wheel. The magnetic disk is threadedly connected to the rotating shaft, and a nut connected to the rotating shaft is provided on one side of the magnetic disk.

[0014] Compared with the prior art, the present invention has multiple guide wheels, which allow the copper flat wire to bend vertically back and forth through the cabinet, and be painted and dried multiple times during the back and forth process. By increasing the height of the device, the length of the device is reduced, thereby reducing the length of the production line, which is beneficial to site layout.

[0015] After the paint is applied, the copper flat wire keeps moving vertically, and the paint is subjected to uniform force in the horizontal direction, which reduces the leveling requirements and does not gather on one side of the copper flat wire. The paint film thickness is uniform, so the yield of the enameled wire is high. At the same time, the paint used can be high in solid content, which effectively reduces the number of painting times, thereby further reducing the length of the equipment.

[0016] After each coat of paint, the copper wire first enters the lower-temperature second chamber, then the higher-temperature third chamber, and finally leaves the lower-temperature second chamber. This prevents the paint from rapidly cooling or heating, resulting in less stress on the cured paint film and less cracking. The vertical arrangement of the four chambers also reduces energy loss.

[0017] By setting up a power compensation mechanism to give the guide wheel a boost, sliding friction between the enameled wire and the guide wheel is avoided, and the paint film is prevented from being scratched, which also improves the yield of the enameled wire.

[0018] Therefore, the utility model has the advantages of reducing the length of the production line, improving the yield rate of the enameled wire, reducing the stress of the paint layer and having low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view schematic diagram of the present utility model.

[0020] Figure 2 is a schematic diagram of a painting device.

[0021] Figure 3 It is a top view schematic diagram of the power compensation mechanism at the lower guide wheel.

[0022] The marks in the accompanying drawings are: 1-copper flat wire, 2-box, 3-first chamber, 4-second chamber, 5-third chamber, 6-fourth chamber, 7-smoke exhaust pipe, 8-upper guide wheel, 9-lower guide wheel, 10-heater, 11-painting device, 12-dehumidification pipe, 13-first fan, 14-dehumidification filter, 15-first air inlet, 16-second fan, 17-second air inlet, 18-overflow paint box, 19-painting block, 20-wire hole, 21-paint touch-up tube, 22-first bracket plate, 23-second bracket plate, 24-rotating shaft, 25-pulley mechanism, 26-motor, 27-disk, 28-nut. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0024] Embodiment. A painting device for reducing the stress of the paint layer of enameled copper flat wire, connected in series for use in an enameled wire production line, comprises a housing 2, within which are arranged, from top to bottom, a first chamber 3, a second chamber 4, a third chamber 5, and a fourth chamber 6. A smoke exhaust pipe 7 is provided at the top of the first chamber 3. Five horizontally distributed upper guide wheels 8 are provided in the first chamber 3, four horizontally distributed lower guide wheels 9 are provided in the fourth chamber 6, and heaters 10 are provided in both the second chamber 4 and the third chamber 5.

[0025] The heater 10 has a constant temperature heating function and is an existing product. The heating temperature of the heater 10 in the second chamber 4 is set to 220°C, and the heating temperature of the heater 10 in the third chamber 5 is set to 350-400°C, preferably 370°C.

[0026] The copper flat wire 1 enters the first chamber 3, alternately passes over the upper guide wheel 8 and the lower guide wheel 9, and then leaves the first chamber 3. Holes for the copper flat wire 1 to pass through are provided in the first chamber 3 and between each chamber. The gap between the holes and the copper flat wire 1 is about 3 mm, and the holes also serve to discharge exhaust gas upward.

[0027] Three painting devices 11 are provided in the first chamber 3 , and the three painting devices 11 are respectively located below the outlet side of the second to third upper guide wheels 8 .

[0028] A dehumidification pipe 12 is provided on the outside of the box body 2, and both ends of the dehumidification pipe 12 are connected to the second chamber 4. A first fan 13 and a dehumidification filter 14 are provided on the dehumidification pipe 12. The dehumidification filter 14 can be purchased directly or made by yourself, such as taking a sealed box in series to the dehumidification pipe 12, and placing limestone filled in a non-woven bag in the sealed box.

[0029] The first chamber 3 is provided with a first air inlet 15, the exhaust pipe 7 is provided with a second fan 16, and the fourth chamber 6 is provided with a second air inlet 17. Under the transpiration effect, clean, cold air from the outside world flows at a low velocity through the second air inlet 17, first into the fourth chamber 6, and then into the third chamber 5. The hot exhaust gas in the third chamber 5 flows into the second chamber 4, and the hot exhaust gas in the second chamber 4 flows into the first chamber 3. Under the action of the second fan 16, the cold air from the outside world flows at high speed from the first air inlet 15 into the first chamber 3, mixing with the hot exhaust gas. After cooling, it is discharged from the exhaust pipe 7 and requires connection to an exhaust gas treatment device before being discharged into the atmosphere.

[0030] The painting device 11 includes a paint overflow box 18 with an opening at the top. A paint block 19 is provided in the middle of the paint overflow box 18. A wire hole 20 is vertically provided in the paint block 19. The upper and lower ends of the wire hole 20 are both trumpet-shaped. The middle of the wire hole 20 contracts inward to form a wire hole that matches the copper flat wire 1. A paint touch-up tube 21 is provided on the upper side of the wire hole 20, one end of which extends out of the box 2. The paint touch-up tube 21 is connected to a paint source, such as a paint tank storing paint, through an oil pump. The paint touch-up tube 21 outputs paint to the copper flat wire 1 at a constant speed and evenly applies the paint to the copper flat wire 1 through the trumpet-shaped hole 20.

[0031] The first chamber 3 and the fourth chamber 6 are both provided with a power compensation mechanism, which is used to provide rotation assistance to the upper guide wheel 8 or the lower guide wheel 9 to reduce the movement resistance of the copper flat wire 1 on the upper guide wheel 8 or the lower guide wheel 9.

[0032] The power compensation mechanism includes a first bracket plate 22 and a second bracket plate 23, both of which are fixed to the box body 2. The first bracket plate 22 and the second bracket plate 23 are parallel to each other. A plurality of rotating shafts 24 are provided between the first bracket plate 22 and the second bracket plate 23. One end of the rotating shaft 24 extends out of the first bracket plate 22 and is connected to the upper guide wheel 8 or the lower guide wheel 9. A pulley mechanism 25 is provided between adjacent rotating shafts 24. The second bracket plate 23 is provided with a motor 26, the output end of which is connected to one of the rotating shafts 24. The pulley mechanism 25 includes synchronous pulleys respectively connected to two adjacent rotating shafts 24 and a synchronous belt connected between the two synchronous pulleys.

[0033] The rotating shaft 24 is connected to the upper guide wheel 8 or the lower guide wheel 9 with a bearing. The end of the rotating shaft 24 is provided with a magnetic disk 27 close to the upper guide wheel 8 or the lower guide wheel 9. The magnetic disk 27 is screwed to the rotating shaft 24. A nut 28 connected to the rotating shaft 24 is provided on one side of the magnetic disk 27.

[0034] Working principle: The copper flat wire 1 is bent into a U shape by the lower guide wheel 9 between two adjacent upper guide wheels 8, that is, the bending point of each U-shaped channel corresponds to the lower guide wheel 9.

[0035] The copper flat wire 1 is heated when passing through the first channel, drying the surface moisture so that the subsequent paint film has good bonding strength.

[0036] When the copper flat wire 1 passes through the second and third channels, it is first coated with paint by the painting device 11 in the first chamber 3, and then enters the second chamber 4 for the first heating. The first heating temperature is 220°C. The paint undergoes a cross-linking reaction at a lower temperature and a slow curing speed, ensuring that the volume can be smoothly discharged from the paint layer after vaporization, while applying a thicker paint film and avoiding the formation of bubbles in the paint film. The copper flat wire 1 then enters the third chamber 5 for the second heating. The second heating temperature is 370°C (which is also the paint curing temperature in the prior art). The paint undergoes a cross-linking reaction at a higher temperature, which can improve the quality of the paint film. The copper flat wire 1 then returns to the second chamber 4. The cured paint is cooled by a lower temperature difference in the second chamber 4, reducing stress accumulation and improving the crack resistance of the paint film. At the same time, some heat is recovered to the second chamber 4, reducing energy consumption. Finally, the copper flat wire 1 enters the first chamber 3, and after cooling to below 120°C in the first chamber 3, it is painted again in the painting device 11. During the second painting, due to the lower temperature of the copper flat wire 1, the paint curing and granulation in the painting device 11 is reduced, and the coating can be uniform, thereby improving the paint quality. The paint applied to the copper rectangular wire 1 during the second and third passes had a solid content of 40%.

[0037] The paint applied to the copper rectangular wire 1 during the fourth passage had a solid content of 28%.

[0038] The paint applied to the copper wire during the second and third passes is thicker than the fourth pass. For example, the first two passes are 15 microns thick, while the third pass is 8 microns thick. The first two passes use a high-solids paint to create a thicker film, while the final pass uses a low-solids, high-flow paint to ensure a smooth outer film surface.

[0039] The first fan 13 circulates the air in the second chamber 4 through the dehumidification filter 14, ensuring that the air humidity in the second chamber 4 is low, thereby improving the painting quality.

[0040] In the power compensation mechanism, due to the pulley mechanism between each rotating shaft 24, the motor 26 drives the rotating shaft 24 to rotate synchronously, which in turn drives the magnetic disk 27. Assuming that under normal circumstances, the total rotational resistance of all lower guide wheels 9 and upper guide wheels 8 is F, by adjusting the distance between each magnetic disk 27 and the lower guide wheel 9 or upper guide wheel 8, the two power compensation mechanisms can provide a total power of 0.7F-0.95F to all lower guide wheels 9 and upper guide wheels 8. In this way, the power compensation mechanism alone cannot drive the movement of the copper flat wire 1. The movement of the copper flat wire 1 still requires a small amount of traction from the production line to ensure that the rotation speed of the lower guide wheel 9 and upper guide wheel 8 matches the movement speed of the copper flat wire 1, avoiding sliding friction and preventing damage to the paint film. At the same time, the longitudinal resistance of the copper flat wire 1 is low, preventing friction wrinkles on the surface paint film due to excessive traction resistance. The power compensation mechanism has a simple structure and relatively low implementation cost.

Claims

1. A painting device for reducing the stress of the paint layer of enameled copper flat wire, characterized by: The invention comprises a box body (2), wherein a first chamber (3), a second chamber (4), a third chamber (5) and a fourth chamber (6) are sequentially arranged in the box body (2) from top to bottom, a smoke exhaust pipe (7) is arranged on the top of the first chamber (3), N+1 horizontally distributed upper guide wheels (8) are arranged in the first chamber (3), N horizontally distributed lower guide wheels (9) are arranged in the fourth chamber (6), the second chamber (4) and the third chamber (5) are both provided with a heater (10), the copper flat wire (1) enters the first chamber (3), alternately bypasses the upper guide wheels (8) and the lower guide wheels (9), and then leaves the first chamber (3), the first chamber (3) is provided with N-1 painting devices (11), and the N-1 painting devices (11) are respectively located below the outlet side of the second to N-1 upper guide wheels (8).

2. The painting equipment for reducing the stress of the paint layer of the enameled copper rectangular wire according to claim 1, characterized in that: A dehumidification pipe (12) is provided on the outside of the box body (2), both ends of the dehumidification pipe (12) are connected to the second chamber (4), and a first fan (13) and a dehumidification filter (14) are provided on the dehumidification pipe (12).

3. The painting equipment for reducing the stress of the paint layer of the enameled rectangular copper wire according to claim 1, characterized in that: The first chamber (3) is provided with a first air inlet (15), the smoke exhaust pipe (7) is provided with a second fan (16), and the fourth chamber (6) is provided with a second air inlet (17).

4. The painting equipment for reducing the stress of the paint layer of the enameled rectangular copper wire according to claim 1, characterized in that: The painting device (11) includes a paint overflow box (18) with an opening at the top, a paint block (19) is provided in the middle of the paint overflow box (18), and a wire hole (20) is vertically provided on the paint block (19). The upper and lower ends of the wire hole (20) are both trumpet-shaped, and the middle of the wire hole (20) shrinks inward to form a wire hole that matches the copper flat wire (1). A paint touch-up tube (21) with one end extending out of the box (2) is provided on the upper side of the wire hole (20).

5. The painting equipment for reducing the stress of the paint layer of the enameled rectangular copper wire according to claim 1, characterized in that: The first chamber (3) and the fourth chamber (6) are both provided with a power compensation mechanism, which is used to provide rotation assistance to the upper guide wheel (8) or the lower guide wheel (9), thereby reducing the moving resistance of the copper flat wire (1) on the upper guide wheel (8) or the lower guide wheel (9).

6. The painting equipment for reducing the stress of the paint layer of the enameled rectangular copper wire according to claim 5, characterized in that: The power compensation mechanism comprises a first bracket plate (22) and a second bracket plate (23) both fixed to the box body (2); the first bracket plate (22) and the second bracket plate (23) are parallel to each other; a plurality of rotating shafts (24) are provided between the first bracket plate (22) and the second bracket plate (23); one end of the rotating shaft (24) extends out of the first bracket plate (22) and is connected to an upper guide wheel (8) or a lower guide wheel (9); a pulley mechanism (25) is provided between adjacent rotating shafts (24); and a motor (26) is provided on the second bracket plate (23) whose output end is connected to one of the rotating shafts (24).

7. The painting equipment for reducing the stress of the paint layer of the enameled rectangular copper wire according to claim 6, characterized in that: The rotating shaft (24) is connected to the upper guide wheel (8) or the lower guide wheel (9) through a bearing. A magnetic disk (27) close to the upper guide wheel (8) or the lower guide wheel (9) is provided at the end of the rotating shaft (24). The magnetic disk (27) is screwed to the rotating shaft (24). A nut (28) connected to the rotating shaft (24) is provided on one side of the magnetic disk (27).

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