U-shaped bolt low-friction-coefficient electrophoretic paint coating equipment

Abstract

The invention relates to the technical field of U-shaped bolt coating, in particular to U-shaped bolt low-friction-coefficient electrophoretic paint coating equipment which comprises a pretreatment tank, an electrophoresis tank and a moving mechanism. A spraying mechanism is arranged in the pretreatment tank and is used for degreasing, washing, surface conditioning and phosphating the U-shaped bolt; the electrophoresis tank is used for immersing the pretreated U-shaped bolt into cathode electrophoretic paint to finish electrophoretic paint coating; the moving mechanism is used for conveying the hanging tool and the U-shaped bolt into the pretreatment tank and conveying the pretreated hanging tool and U-shaped bolt into the electrophoresis tank to be coated with electrophoretic paint. The device has the advantages that the automation degree is high, the surface friction coefficient of the coated bolt thread is low, and the standard requirement is met, and the problems that an existing U-shaped bolt electrophoretic paint coating process is multiple, the automation degree is low, the machining efficiency is low, and the surface friction coefficient of the coated bolt thread is large; the problem that unfavorable influence is generated on tightening of the nut when the U-shaped bolt is assembled and connected is solved.

Description

Technical Field

[0001] The invention relates to the technical field of U-bolt coating, in particular to low-friction-coefficient electrophoretic paint coating equipment for U-bolts. Background Art

[0002] U-bolts are the connecting parts between leaf springs and axles, and play an important role in the reliability of the vehicle chassis and driving safety. After the U-bolts are produced and processed, in order to improve the corrosion resistance of the outer surface of the U-bolts and ensure the normal assembly of the U-bolts, the parts other than the threaded parts of the U-bolts need to be electrophoretically coated.

[0003] U-bolts are coated with existing cathodic electrophoretic paint, which requires pre-degreasing, degreasing, multiple water washing, surface adjustment, phosphating, and finally cathodic electrophoresis. There are many processing steps, low automation, low processing efficiency, and the friction coefficient of the bolt thread surface after coating is large, which will have an adverse effect on the tightening of the nut when the U-bolt is assembled and connected. To this end, we propose a low friction coefficient electrophoretic paint coating equipment for U-bolts. Summary of the invention

[0004] The purpose of the present invention is to provide a U-bolt low friction coefficient electrophoretic paint coating equipment, which has the advantages of high degree of automation and low friction coefficient on the bolt thread surface after coating, which meets the requirements of standards. It solves the problem that the existing U-bolt electrophoretic paint coating has many steps, low degree of automation, low processing efficiency, and high friction coefficient on the bolt thread surface after coating, which leads to an adverse effect on the tightening of the nut when the U-bolt is assembled and connected.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a U-shaped bolt low friction coefficient electrophoretic paint coating device, comprising a pretreatment tank, an electrophoretic tank and a moving mechanism;

[0006] The pretreatment tank is provided with a spray mechanism, which is used for degreasing, washing, surface conditioning and phosphating the U-bolts; the electrophoresis tank is used for immersing the pretreated U-bolts into cathode electrophoresis paint to complete electrophoresis paint coating;

[0007] The moving mechanism is used to transport the hanger and the U-shaped bolt to the pretreatment tank, and to transport the pretreated hanger and the U-shaped bolt to the electrophoretic tank for electrophoretic paint;

[0008] There are several movable mechanisms installed on the slide rail. The movable mechanism drives the movable mechanism and the hanger to slide along the slide rail through the driving device, and the movable mechanism drives the hanger to rise and fall through the driving device to place the U-bolt in the pretreatment tank and the electrophoresis tank.

[0009] Preferably, the driving device comprises a translation motor, a rack 1 is provided on the slide rail, an output shaft of the translation motor is connected to a gear 1 meshing with the rack 1, and the translation motor is used to drive the moving mechanism to translate along the slide rail.

[0010] Preferably, the driving device includes a lifting motor and rack 2, the output shaft of the lifting motor is connected to gear 2 meshing with rack 2, the bottom of rack 2 is movably connected to the hanger through a hook, and the lifting motor is used to drive rack 2 and the hanger to rise and fall.

[0011] Preferably, the spray mechanism includes an outer spray bracket located at the periphery of the hanger and an inner spray bracket located at the center of the hanger, the outer spray bracket and the inner spray bracket are both connected to the pipeline through a rotating joint, and spray holes are provided on the outer spray bracket and the inner spray bracket, and the spray holes on the outer spray bracket are inclined clockwise or counterclockwise toward the center, and the outer spray bracket rotates along the rotating joint under the reaction force of the sprayed liquid, and a drain valve is provided at the bottom of the pretreatment tank.

[0012] Preferably, the pipeline is connected to the degreaser pipe, water pipe one, surface conditioner pipe and water pipe two, and valves are provided on the degreaser pipe, water pipe one, surface conditioner pipe and water pipe two.

[0013] Preferably, a heating jacket, a temperature sensor and a booster pump are provided on the pipeline, the temperature sensor is provided at the pipeline outlet, and the booster pump is provided between the heating jacket and the temperature sensor.

[0014] Preferably, a distance sensor 1 is provided on the side of the moving mechanism to detect the distance between two adjacent moving mechanisms;

[0015] The moving mechanism is used to transport the hanger and U-bolts on the conveying rack 1 to the pretreatment tank, and to transport the hanger and U-bolts in the electrophoresis tank to the conveying rack 2;

[0016] A distance sensor 2 is provided at the bottom of the moving mechanism for detecting the height of the hanger, the U-bolt, the first conveying frame and the second conveying frame;

[0017] The mobile mechanism is provided with a communication module and a timer.

[0018] Preferably, the electrophoresis tank is provided with a distance sensor 3 for detecting the distance between the hanger and the U-bolt on the conveying frame 2 and the electrophoresis tank;

[0019] The conveyor rack 1 and the conveyor rack 2 both use conveyor belts. The conveyor rack 1 is used to feed the electrophoretic paint coating equipment, and the conveyor rack 2 is used to transport the painted hangers and U-bolts to the drying room.

[0020] Preferably, the hanger comprises a vertical pole, a hanging ring and a hanging plate; the hanging ring is connected to a plurality of hanging plates through the vertical pole, a conical hanging groove is formed on the hanging plate, and a baffle is connected to the end of the hanging plate.

[0021] Preferably, black cathode electrophoretic paint is used in the electrophoretic tank, the temperature is maintained at 28-32° C., the electrophoretic treatment time is 150 s, the voltage is set to 220 V, the solid content of the black cathode electrophoretic paint in the electrophoretic tank liquid is 16%-19%, and the pH value in the electrophoretic tank is 5.6-6.2.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] By setting up a pretreatment tank, the spray mechanism in the pretreatment tank automatically pre-degreases, washes, adjusts the surface, and phosphates the U-bolts. The hanger and the U-bolts are placed in the pretreatment tank for pretreatment by a moving mechanism. After the pretreatment of the U-bolts, the moving mechanism moves them to the electrophoresis tank. After coating with TG9001 black cathode electrophoresis paint, the moving mechanism automatically moves them to a drying room or oven for drying. This coating technology can not only achieve full automation, but also the salt spray resistance of the electrophoretic coating of the U-bolts (including screws and threads) can reach 240h, ensuring the overall anti-corrosion performance of the U-bolts; at the same time, the surface friction coefficient of the electrophoretic coating at the U-thread can be stably controlled at about 0.11, which can provide a stable clamping force for the assembly of bolts and nuts, ensure the tightening requirements of the U-bolts during assembly, and improve the reliability of automotive chassis parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the hanger of the present invention;

[0026] Figure 3 A top view of the hanger of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the pretreatment tank of the present invention;

[0028] Figure 5 It is a schematic diagram of the spray hole of the present invention.

[0029] In the figure: 1, pretreatment tank; 2, electrophoresis tank; 3, moving mechanism; 4, hanger; 401, upright pole; 402, hanging ring; 403, hanging plate; 404, hanging slot; 405, baffle; 5, U-bolt; 6, slide rail; 7, rack 1; 8, translation motor; 9, gear 1; 10, lifting motor; 11, gear 2; 12, rack 2; 13, spray outer bracket; 14, spray inner bracket; 15, spray hole; 16. Rotating joint; 17. Pipe; 18. Degreaser pipe; 19. Water pipe 1; 20. Surface conditioning pipe; 21. Water pipe 2; 22. Heating sleeve; 23. Temperature sensor; 24. Booster pump; 25. Drain valve; 26. Distance sensor 1; 27. Distance sensor 2; 28. Conveyor rack 1; 29. ​​Conveyor rack 2; 30. Communication module; 31. Timer; 32. Hook; 33. Distance sensor 3. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] like Figure 1 As shown, a U-shaped bolt low friction coefficient electrophoretic paint coating equipment includes a pretreatment tank 1, an electrophoretic tank 2 and a moving mechanism 3;

[0033] A spray mechanism is provided in the pretreatment tank 1, and the electrophoretic tank 2 is used to immerse the pretreated U-bolts 5 into the cathode electrophoretic paint to complete the electrophoretic paint coating; the spray mechanism in the pretreatment tank 1 automatically performs pre-degreasing, water washing, surface conditioning, and phosphating treatment on the U-bolts 5, specifically, FC-E2085 degreaser is sprayed on the U-bolts 5 on the hanger 4 at 20-30°C through the spray mechanism to complete the pre-degreasing process; and FC-E2085 degreaser is used again, and the spray mechanism sprays the U-bolts 5 that have completed the pre-degreasing process at 20-30°C to complete the degreasing process; and the spray mechanism sprays water for flushing, uses PL-4040 surface conditioning agent for spraying, and uses PB-L3035 surface conditioning agent for full immersion for 2-3 minutes to complete the phosphating process.

[0034] The moving mechanism 3 is used to transport the hanger 4 and the U-shaped bolt 5 to the pretreatment tank 1, and to transport the pretreated hanger 4 and the U-shaped bolt 5 to the electrophoretic tank 2 for coating with electrophoretic paint; there are a plurality of moving mechanisms 3, and they are installed on the slide rail 6. The moving mechanism 3 drives the moving mechanism 3 and the hanger 4 to slide along the slide rail 6 as a whole through the driving device, and the moving mechanism 3 drives the hanger 4 to rise and fall through the driving device to place the U-shaped bolt 5 in the pretreatment tank 1 and the electrophoretic tank 2.

[0035] The hanger 4 and the U-bolt 5 are placed in the pretreatment tank 1 for pretreatment by the moving mechanism 3. After the pretreatment of the U-bolt 5, the moving mechanism 3 moves it to the electrophoresis tank 2. After coating with TG9001 black cathode electrophoresis paint, the moving mechanism 3 automatically moves it to the drying room or oven for drying. This coating technology can not only achieve full automation, but also the salt spray resistance of the electrophoresis coating of the U-bolt 5 (including the screw and thread) can reach 240h, ensuring the overall anti-corrosion performance of the U-bolt 5; at the same time, the surface friction coefficient of the electrophoresis coating at the U-thread can be stably controlled at about 0.11, which can provide a stable clamping force for the assembly of the bolt and nut, ensuring the tightening requirements of the U-bolt 5 during assembly, and improving the reliability of automobile chassis parts.

[0036] Embodiment 2:

[0037] like Figure 1 As shown, on the basis of the first embodiment, the driving device includes a translation motor 8, a rack 7 is provided on the slide rail 6, the output shaft of the translation motor 8 is connected to a gear 9 meshing with the rack 7, and the translation motor 8 is used to drive the moving mechanism 3 to translate along the slide rail 6. The translation motor 8 adopts a servo motor with a self-locking function, which can be self-locked and fixed when moved to a certain position, and the translation motor 8 drives the entire moving mechanism 3 to translate along the rack 7 on the slide rail 6 by driving the gear 9 to rotate.

[0038] The driving device includes a lifting motor 10 and a rack 2 12. The output shaft of the lifting motor 10 is connected to a gear 2 11 meshing with the rack 2 12. The bottom of the rack 2 12 is movably connected to the hanger 4 through a hook 32. The lifting motor 10 is used to drive the rack 2 12 and the hanger 4 to rise and fall. The rack 2 12 is made of insulating material and is connected to electricity through the hanger 4 to realize electrophoresis. The lifting motor 10 also uses a servo motor with a self-locking function. When it moves to a certain height, it can be self-locked and fixed, so that the hanger 4 and the U-bolt 5 can be stabilized in the pretreatment tank 1 or the electrophoresis tank 2, which is convenient for pretreatment and electrophoresis. Since the processing time and operation process of pretreatment and electrophoresis are different, by setting a number of independent moving mechanisms 3 on the slide rail 6, it can be independently moved according to the process requirements for pretreatment and electrophoresis. When the front U-bolt 5 is electrophoresed, the moving mechanism 3 transports it to the drying room, and the rear U-bolt 5 has not yet completed the pretreatment, so it remains stationary, does not need to move forward, and remains independent of each other. Since the pretreatment time is longer than the electrophoresis time, multiple pretreatment tanks 1 can be configured to pretreatment multiple groups of U-shaped bolts 5 at the same time, and then enter the electrophoresis tank 2 for electrophoresis together to improve the coating efficiency. Each moving mechanism 3 is independently set and can be automatically adjusted according to the process requirements.

[0039] Embodiment three:

[0040] like Figure 1 , 4 As shown in Figure 5, based on the second embodiment, the spray mechanism includes a spray outer bracket 13 located at the periphery of the hanger 4 and a spray inner bracket 14 located at the center of the hanger 4. The spray outer bracket 13 and the spray inner bracket 14 are connected to the pipeline 17 through a rotating joint 16. The spray outer bracket 13 and the spray inner bracket 14 are both provided with spray holes 15. The spray holes 15 on the spray outer bracket 13 are tilted clockwise or counterclockwise toward the center, so that the spray outer bracket 13 rotates along the rotating joint 16 under the reaction force of the sprayed liquid. The rotating spray outer bracket 13 can realize all-round spraying of the hanger 4 and the U-bolt 5. A drain valve 25 is provided at the bottom of the pretreatment tank 1. The drain valve 25 can discharge waste liquid on the one hand and hold liquid on the other hand to facilitate phosphating treatment. The phosphating treatment adopts PB-L3035 surface conditioning agent, and the U-bolt 5 that has completed the surface conditioning process is fully immersed at 33-37°C for 2-3 minutes. The phosphating treatment may also be performed by setting up a treatment tank to inject the PB-L3035 surface conditioning agent to fully immerse the U-bolt 5.

[0041] Pipe 17 is connected to degreaser pipe 18, water pipe 1 19, surface conditioning pipe 20 and water pipe 2 21, and valves are provided on degreaser pipe 18, water pipe 1 19, surface conditioning pipe 20 and water pipe 2 21. Degreaser pipe 18 is used to provide FC-E2085 degreaser to pipe 17 and spray mechanism, spray U-bolt 5 on hanger 4 at 20-30°C, and complete pre-degreasing process and pre-degreasing process; water pipe 1 19 is used to provide tap water to pipe 17 and spray mechanism to complete the first water washing process and the second water washing process of U-bolt 5. Surface conditioning pipe 20 is used to provide PL-4040 surface conditioning agent and PB-L3035 surface conditioning agent to pipe 17 and spray mechanism to complete the surface conditioning process and phosphating process. Water pipe 2 21 is used to provide deionized water to pipe 17 and spray mechanism to complete the pure water washing process.

[0042] The pipe 17 is provided with a heating jacket 22, a temperature sensor 23 and a booster pump 24. The temperature sensor 23 is provided at the outlet of the pipe 17, and the booster pump 24 is provided between the heating jacket 22 and the temperature sensor 23. Since a degreasing agent at 20-30°C and a PB-L3035 surface conditioner at 33-37°C need to be provided during the spraying process, the heating jacket 22 and the temperature sensor 23 can control the temperature thereof so that the temperature can meet the setting requirements. The booster pump 24 can be provided to improve the spraying efficiency and spraying effect.

[0043] Embodiment 4:

[0044] like Figure 1 As shown, on the basis of the third embodiment, a distance sensor 26 is arranged on the side of the mobile mechanism 3 for detecting the distance between two adjacent mobile mechanisms 3; since the plurality of mobile mechanisms 3 are independently arranged, the distance sensor 26 can be used to obtain the distance between two adjacent mobile mechanisms 3 to avoid collision, and it is also convenient for the rear mobile mechanism 3 to catch up in time after the U-bolt 5 of the front mobile mechanism 3 is processed.

[0045] The moving mechanism 3 is used to transport the hanger 4 and the U-shaped bolt 5 on the conveying frame 1 28 to the pretreatment tank 1 , and to transport the hanger 4 and the U-shaped bolt 5 in the electrophoresis tank 2 to the conveying frame 2 29 ;

[0046] The bottom of the mobile mechanism 3 is provided with a distance sensor 27 for detecting the height of the hanger 4, the U-bolt 5, the conveyor frame 1 28 and the conveyor frame 2 29; the racks 2 12 and the hooks 32 of the multiple mobile mechanisms 3 are on the same plane as the conveyor frame 1 28 and the conveyor frame 2 29, so that the hooks 32 of the mobile mechanism 3 can transport the hanger 4 between the conveyor frame 1 28 and the conveyor frame 2 29. The distance sensor 2 27 can locate the detection hanger 4, the U-bolt 5, the conveyor frame 1 28 and the conveyor frame 2 29, so that the mobile mechanism 3 can move the hanger 4 to the specified position and height according to the process requirements. Under the guidance of the distance sensor 1 26 and the distance sensor 2 27, the mobile mechanism 3 inserts the hook 32 into the hanging ring 402 of the hanger 4, removes the hanger 4 from the conveyor frame 1 28, or places the hanger 4 on the conveyor frame 2 29. The mobile mechanism 3 is provided with a communication module 30 and a timer 31. By setting the timer 31, the processing time of the hanger 4 and the U-bolt 5 in each process can be recorded and controlled, and remote transmission and control can be achieved through the communication module 30. The staff can directly input the time parameters.

[0047] The electrophoretic tank 2 is provided with a distance sensor 33 for detecting the distance between the hanger 4 and the U-bolt 5 on the conveyor frame 29 and the electrophoretic tank 2; the conveyor frame 1 28 and the conveyor frame 2 29 both use conveyor belts, the conveyor frame 1 28 is used to feed the electrophoretic paint coating equipment, and the conveyor frame 2 29 is used to transport the painted hanger 4 and the U-bolt 5 to the drying room. When the conveyor frame 1 28 and the conveyor frame 2 29 both use conveyor belts, the width of the conveyor belt is less than the inner diameter of the hanging ring 402, and the distance sensor 3 33 can prevent the hanger 4 and the U-bolt 5 from falling off the conveyor frame 1 28 during the conveying process of the conveyor frame 1 28. When the distance sensor 3 33 detects that the hanger 4 and the U-bolt 5 on the conveyor frame 1 28 are approaching, the conveyor belt of the conveyor frame 1 28 stops working, and waits for the mobile mechanism 3 to take away the hanger 4 and the U-bolt 5, and then the conveyor belt continues to run, so that the material is loaded and stopped in this cycle, ensuring continuous loading while preventing the hanger 4 and the U-bolt 5 from falling off. When the moving mechanism 3 transfers the hanger 4 and the U-bolt 5 to the conveying rack 29, the U-bolt 5 is directly transported to the drying room by the conveyor belt. The U-bolt 5 that has completed the cathode electrophoresis process is dried at 175° C. for 25 minutes, thereby completing the coating process of the U-bolt 5.

[0048] In addition, in order to ensure the efficient operation of the mobile mechanism 3, the slide rail 6 is set as a ring structure, so that the mobile mechanism 3 that transfers the hanger 4 and the U-bolt 5 to the conveying frame 2 29 can directly bypass the conveying frame 1 28 to load materials.

[0049] Embodiment five:

[0050] like Figure 1 , 2As shown in FIG. 3 , on the basis of the fourth embodiment, the hanger 4 includes a vertical rod 401, a hanging ring 402 and a hanging plate 403; the hanging ring 402 is connected to a plurality of hanging plates 403 through the vertical rod 401, a conical hanging groove 404 is provided on the hanging plate 403, and a baffle 405 is connected to the end of the hanging plate 403. By providing multiple scrapers, the number of U-bolts 5 that can be coated in a single time can be increased, and batch coating can be achieved. By providing a conical hanging groove 404, the contact area between the U-bolt 5 and the hanging plate 403 can be reduced, thereby improving the electrophoresis effect.

[0051] The electrophoretic tank 2 uses black cathode electrophoretic paint, the temperature is maintained at 28-32°C, the electrophoretic treatment time is 150s, the voltage is set to 220V, the solid content of the black cathode electrophoretic paint in the electrophoretic tank liquid is 16%-19%, and the pH value in the electrophoretic tank 2 is 5.6-6.2. After coating with TG9001 black cathode electrophoretic paint, the salt spray resistance of the electrophoretic coating of the U-bolt 5 (including the screw and thread) can reach 240h, ensuring the overall anti-corrosion performance of the U-bolt 5; at the same time, the surface friction coefficient of the electrophoretic coating at the U-thread can be stably controlled at about 0.11, which can provide a stable clamping force for the assembly of the bolt and nut, ensuring the tightening requirements of the U-bolt 5 during assembly, and improving the reliability of the chassis parts of the automobile.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A U-bolt low friction coefficient electrophoretic paint coating equipment, characterized by: It comprises a pretreatment tank (1), an electrophoresis tank (2) and a moving mechanism (3); The pretreatment tank (1) is provided with a spray mechanism, and the spray mechanism is used for degreasing, washing, surface conditioning and phosphating the U-shaped bolts (5); the electrophoresis tank (2) is used for immersing the pretreated U-shaped bolts (5) into cathode electrophoresis paint to complete electrophoresis paint coating; The moving mechanism (3) is used to transport the hanger (4) and the U-shaped bolt (5) to the pretreatment tank (1), and to transport the pretreated hanger (4) and the U-shaped bolt (5) to the electrophoretic tank (2) for coating with electrophoretic paint; A plurality of the moving mechanisms (3) are provided and are mounted on a slide rail (6). The moving mechanism (3) drives the moving mechanism (3) and the hanger (4) to slide along the slide rail (6) as a whole through a driving device. The moving mechanism (3) drives the hanger (4) to rise and fall through the driving device to place the U-shaped bolt (5) in the pretreatment tank (1) and the electrophoresis tank (2).

2. A U-bolt low friction coefficient electrophoretic paint coating equipment according to claim 1, characterized in that: The driving device comprises a translation motor (8), a rack (7) is arranged on the slide rail (6), an output shaft of the translation motor (8) is connected to a gear (9) meshing with the rack (7), and the translation motor (8) is used to drive the moving mechanism (3) to translate along the slide rail (6).

3. A U-bolt low friction coefficient electrophoretic paint coating equipment according to claim 2, characterized in that: The driving device comprises a lifting motor (10) and a second rack (12); the output shaft of the lifting motor (10) is connected to a second gear (11) meshing with the second rack (12); the bottom of the second rack (12) is movably connected to the hanger (4) via a hook (32); and the lifting motor (10) is used to drive the second rack (12) and the hanger (4) to rise and fall.

4. The low friction coefficient electrophoretic paint coating equipment for U-bolts according to claim 1, characterized in that: The spray mechanism comprises a spray outer bracket (13) located at the periphery of the hanger (4) and a spray inner bracket (14) located at the center of the hanger (4); the spray outer bracket (13) and the spray inner bracket (14) are both connected to a pipe (17) via a rotating joint (16); spray holes (15) are provided on the spray outer bracket (13) and the spray inner bracket (14); the spray holes (15) on the spray outer bracket (13) are inclined clockwise or counterclockwise toward the center; the spray outer bracket (13) rotates along the rotating joint (16) under the reaction force of the sprayed liquid; and a drain valve (25) is provided at the bottom of the pretreatment tank (1).

5. The low friction coefficient electrophoretic paint coating equipment for U-bolts according to claim 4, characterized in that: The pipeline (17) is connected to the degreasing agent pipe (18), the first water pipe (19), the surface regulating pipe (20) and the second water pipe (21), and valves are arranged on the degreasing agent pipe (18), the first water pipe (19), the surface regulating pipe (20) and the second water pipe (21).

6. The low friction coefficient electrophoretic paint coating equipment for U-bolts according to claim 5, characterized in that: The pipeline (17) is provided with a heating jacket (22), a temperature sensor (23) and a booster pump (24); the temperature sensor (23) is provided at the outlet of the pipeline (17); and the booster pump (24) is provided between the heating jacket (22) and the temperature sensor (23).

7. The low friction coefficient electrophoretic paint coating equipment for U-bolts according to claim 1, characterized in that: A distance sensor (26) is provided on the side of the moving mechanism (3) for detecting the distance between two adjacent moving mechanisms (3); The moving mechanism (3) is used to transport the hanger (4) and the U-shaped bolt (5) on the conveying frame 1 (28) to the pretreatment tank (1), and to transport the hanger (4) and the U-shaped bolt (5) in the electrophoresis tank (2) to the conveying frame 2 (29); A distance sensor 2 (27) is provided at the bottom of the moving mechanism (3) for detecting the heights of the hanger (4), the U-bolt (5), the conveying frame 1 (28) and the conveying frame 2 (29); The mobile mechanism (3) is provided with a communication module (30) and a timer (31).

8. The low friction coefficient electrophoretic paint coating equipment for U-bolts according to claim 7, characterized in that: The electrophoresis tank (2) is provided with a distance sensor 3 (33) for detecting the distance between the hanger (4) and the U-shaped bolt (5) on the conveying frame 2 (29) and the electrophoresis tank (2); The conveying rack 1 (28) and the conveying rack 2 (29) both use conveyor belts. The conveying rack 1 (28) is used to feed the electrophoretic paint coating equipment, and the conveying rack 2 (29) is used to transport the painted hangers (4) and U-bolts (5) to the drying room.

9. The low friction coefficient electrophoretic paint coating equipment for U-bolts according to claim 1, characterized in that: The hanger (4) comprises a vertical pole (401), a hanging ring (402) and a hanging plate (403); the hanging ring (402) is connected to a plurality of hanging plates (403) via the vertical pole (401); a conical hanging groove (404) is provided on the hanging plate (403); and a baffle (405) is connected to the end of the hanging plate (403).

10. A U-bolt low friction coefficient electrophoretic paint coating equipment according to any one of claims 1 to 9, characterized in that: The electrophoresis tank (2) uses black cathode electrophoresis paint, the temperature is maintained at 28-32° C., the electrophoresis treatment time is 150 s, the voltage is set to 220 V, the solid content of the black cathode electrophoresis paint in the electrophoresis tank liquid is 16%-19%, and the pH value in the electrophoresis tank (2) is 5.6-6.2.

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