Spraying process and device in multi-color coating production line of aluminum alloy wheel hub

Abstract

The present application relates to the technical field of spraying process and device, in particular to spraying process and device in aluminum alloy wheel hub multi-color coating production line, spraying device in aluminum alloy wheel hub multi-color coating production line includes production assembly, which has transport table in base and spraying bin on, spraying main body in spraying bin is provided with spraying groove, and spraying nozzle is arranged at the end of the spraying groove. The side wall of the spraying main body is provided with a color changing assembly, which includes a color changing groove, a color changing barrel is arranged in the groove, and the color changing barrel is driven to rotate by a driving motor to change the color of the coating. The spraying main body is provided with a shielding assembly and a cleaning assembly, the shielding assembly includes a shielding plate, and the shielding plate prevents residual material pollution; the cleaning assembly includes a lifting groove and a lifting plate, the lifting groove is connected with a cleaning nozzle and a water inlet pipe, and residual material in the spraying groove can be cleaned, thereby solving the problems of large space occupation, long time consumption, difficult cleaning of residual material, defects and cross contamination in the prior art, and restricting the qualified rate and efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spraying process and device, in particular to a spraying process and device in an aluminum alloy hub multi-color coating production line. BACKGROUND

[0002] Multi-color coating technology has become a key process to meet the individual needs of automobiles, and the core device design needs to strictly match the technical scope of the spraying equipment. In the prior art, an aluminum alloy hub multi-color coating production line usually consists of a transportation table, a spraying cabin and a spraying main body to form a basic framework. The transportation table is responsible for transporting the pretreated hub into the spraying cabin, and the spraying main body realizes paint spraying through a spraying nozzle. Some devices are equipped with a color changing valve block group beside the mechanical arm or the spraying main body to realize the supply of different color paints through pipeline switching.

[0003] However, the traditional color changing structure usually adopts a linear array arrangement of valve block groups, which not only occupies a large amount of space beside the spraying main body, but also needs to interrupt the spraying operation for pipeline switching during the color changing process. The replacement of a single group of colors takes a long time, which seriously affects the production line rhythm. More importantly, the residual paint in the spraying groove and the spraying nozzle before color changing lacks efficient cleaning means, and it is difficult to completely remove the residual paint in the gap, resulting in defects such as particles and color difference, which do not meet the relevant appearance requirements. At the same time, the residual paint also causes cross contamination of subsequent colors, reduces the accuracy of multi-color coating, and seriously restricts the product qualification rate and production efficiency. SUMMARY

[0004] In view of the above shortcomings of the prior art, the present application provides a spraying process and device in an aluminum alloy hub multi-color coating production line, which can effectively solve the problems of large space occupation, long time consumption, difficult cleaning of residual paint, resulting in defects and cross contamination, and restricting the qualification rate and efficiency in the prior art.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme:

[0006] The present application provides a spraying device in an aluminum alloy hub multi-color coating production line, which comprises a production assembly, the production assembly comprises a base, a transportation table is installed in the base, a spraying cabin is installed on the base, a spraying main body is installed in the spraying cabin, a spraying groove is formed in the spraying main body, a spraying nozzle is installed at the end of the spraying groove, a color changing assembly is arranged on the side wall of the spraying main body, and a shielding assembly and a cleaning assembly are arranged in the spraying main body.

[0007] The color changing assembly is used to change the color of the paint sprayed by the spraying nozzle, and comprises a color changing groove formed in the side wall of the spraying main body. A color changing barrel is rotatably connected in the color changing groove. The rotation of the color changing barrel is driven by a driving motor, and the driving motor is installed in the spraying cabin.

[0008] The shielding assembly is used to avoid the pollution of the hub by the cleaned excess material, and comprises a shielding T-shaped rotating hole formed in the bottom of the spraying main body, and a shielding H-shaped rotating rod and a shielding plate rotatably connected in the shielding T-shaped rotating hole.

[0009] The cleaning assembly is used to clean the excess material in the spraying groove, and comprises a lifting groove formed in the bottom of the spraying main body, and a lifting plate slidably connected in the lifting groove, and the bottom of the lifting plate is fixedly connected with the spraying nozzle, the lifting groove is communicated with a cleaning nozzle, and the sidewall of the lifting groove is communicated with a water inlet pipe.

[0010] Preferably, the output end of the driving motor is fixedly connected with a driving shaft, the sidewall of the driving shaft is fixedly connected with a driving gear, the driving gear is meshingly connected with a color changing gear, the color changing gear is fixedly connected to the sidewall of the color changing barrel, a paint groove is formed in the color changing barrel, an adding hole is formed in the top of the spraying bin, and the bottom of the paint groove is communicated with the spraying groove.

[0011] Preferably, the bottom of the driving shaft is formed with a first belt groove, the sidewall of the shielding H-shaped rotating rod is formed with a second belt groove, and a transmission groove is formed in the spraying main body, and the first belt groove and the second belt groove are transmissionally connected through a transmission belt.

[0012] Preferably, the lifting plate and the lifting groove are connected through a lifting spring, the spraying nozzle and the spraying groove are connected through a connecting hose, a cleaning groove is formed in the spraying main body, the cleaning groove is communicated with the lifting groove, the sidewall of the cleaning groove is communicated with the cleaning nozzle through a cleaning channel, the cleaning nozzle is installed in an installation groove formed in the spraying main body, a baffle is installed in the installation groove, the baffle is located above the cleaning nozzle, and a one-way valve is installed in the water inlet pipe.

[0013] Preferably, the shielding plate is provided with a waste discharge assembly, the waste discharge assembly comprises a waste discharge T-shaped groove formed in the surface of the shielding plate, the bottom of the waste discharge T-shaped groove is communicated with a waste discharge drainage groove, and the tail end of the waste discharge drainage groove is provided with a waste discharge port.

[0014] Preferably, a time delay groove is formed in the shielding H-shaped rotating rod, a time delay fixing rod is fixedly connected to the top of the shielding plate, and the time delay groove and the time delay fixing rod are connected through a time delay torsional spring.

[0015] Preferably, a clamping assembly is arranged between the spraying body and the shielding H-shaped rotating rod, the clamping assembly comprises a clamping tooth groove arranged at the top of the delay fixing rod, a clamping tooth rod is inserted into the clamping tooth groove, the top of the clamping tooth rod is fixedly connected with a connecting disc, the connecting disc is slidingly connected in a cylindrical groove, and the cylindrical groove and the connecting disc are connected through a reset spring.

[0016] Preferably, a hydraulic piston groove is arranged in the spraying body, a hydraulic drive rod is slidingly connected in the hydraulic piston groove, the top of the hydraulic drive rod abuts against the color changing barrel, the hydraulic piston groove and the hydraulic drive rod are connected through a hydraulic spring, the hydraulic piston groove and the connecting disc are connected through a hydraulic transmission groove, and the bottom of the color changing barrel is provided with a reset groove, and the hydraulic drive rod is slidingly connected in the reset groove.

[0017] The application also provides a spraying process in an aluminum alloy hub multi-color coating production line, comprising:

[0018] S1, cleaning, degreasing and polishing treatment are performed on the aluminum alloy hub, and if necessary, a primer is applied and cured to ensure that the surface is clean and has good adhesion conditions;

[0019] S2, according to a multi-color design scheme, a shielding material, a special jig or a color matching template is used to divide the spraying area, and the construction sequence of each color is determined;

[0020] S3, the corresponding color paint is sprayed on the target area in the preset sequence, and after the spraying and curing of each color are completed, the corresponding isolation device is removed;

[0021] S4, the jig positioning and template calibration are used to ensure that the boundaries of different colors are accurately matched, and the gradual change effect is realized by adjusting the spraying parameters to realize color fusion;

[0022] S5, after all the color spraying is completed, the product is subjected to baking and curing, cooling and shaping, and finishing protection treatment, so that the stability of the coating and the surface performance are improved.

[0023] Compared with the known prior art, the technical scheme provided by the application has the following beneficial effects:

[0024] The present scheme adopts a rotary color changing barrel integrated with multiple independent paint grooves, realizes rapid color changing through gear meshing transmission, does not need complex pipeline switching, greatly shortens the color changing time, and improves the production line rhythm. Compared with the traditional linear array valve block group, the integrated design significantly reduces the equipment floor area, and adapts to the compact layout demand of the production line. At the same time, the color changing, shielding and cleaning components are linked through the transmission structure, the subsequent processes are started synchronously after the color changing action is triggered, no additional driving mechanism is needed, the energy consumption and maintenance cost are reduced, and the actual demand of continuous production is met.

[0025] Meanwhile, the scheme effectively solves the problems of residual material and cross contamination, and guarantees the coating quality. The cleaning assembly accurately cleans the gaps of the spraying groove through the directional nozzle, and realizes the centralized discharge of residual material in cooperation with the waste discharge assembly, so as to completely remove the residual material and avoid the defects of particles and color difference. The shielding assembly accurately shields the hub during color changing through the delay linkage design, prevents the residual material from dropping and polluting, and the waste discharge system reduces the waste of coating. The components work together to reduce the risk of cross contamination from the source, improve the product qualification rate, and the waste discharge process does not use chemical solvents, which meets the environmental protection requirements, and guarantees the boundary accuracy and surface performance stability of the multi-color coating of the aluminum alloy hub. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0028] Figure 2 is a schematic diagram of the cross-sectional structure of the present application;

[0029] Figure 3 is a schematic diagram of the local structure of the present application Figure 2 ;

[0030] Figure 4 is a schematic diagram of the enlarged structure at A in Figure 3 ;

[0031] Figure 5 is a schematic diagram of the enlarged structure at B in Figure 4 ;

[0032] Figure 6 is a schematic diagram of the enlarged structure at C in Figure 4 .

[0033] Reference signs: 1, production assembly; 11, base; 12, transport table; 13, spraying bin; 14, spraying main body; 15, spraying nozzle; 16, spraying groove; 2, color changing assembly; 21, color changing groove; 22, color changing barrel; 23, color changing gear; 24, drive motor; 25, drive shaft; 26, drive gear; 27, paint tank; 28, adding hole; 3, shielding assembly; 31, shielding plate; 32, shielding T-shaped rotating hole; 33, shielding H-shaped rotating rod; 34, transmission groove; 35, transmission belt; 36, No. 1 belt groove; 37, No. 2 belt groove; 4, cleaning assembly; 41, lifting groove; 42, lifting plate; 43, lifting spring; 44, connecting hose; 45, cleaning groove; 46, mounting groove; 47, baffle; 48, cleaning nozzle; 49, cleaning channel; 410, water inlet pipe; 411, one-way valve; 5, waste discharge assembly; 51, waste discharge T-shaped groove; 52, waste discharge drainage groove; 53, sewage outlet; 54, delay groove; 55, delay fixing rod; 56, delay torsional spring; 6, clamping assembly; 61, clamping gear slot; 62, clamping tooth rod; 63, connecting disc; 64, cylindrical groove; 65, reset spring; 66, hydraulic piston groove; 67, hydraulic drive rod; 68, hydraulic spring; 69, hydraulic transmission groove; 610, return groove. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] The present application will be further described below with reference to the embodiments.

[0036] Embodiment 1: Referring to Figures 1 to 6 , the spraying device in the multi-color coating production line of aluminum alloy wheel hub, comprising a production assembly 1, the production assembly 1 comprising a base 11, the base 11 being provided with a transport table 12, the base 11 being provided with a spraying bin 13, the spraying bin 13 being provided with a spraying main body 14, the spraying main body 14 being provided with a spraying groove 16, the spraying groove 16 being provided with a spraying nozzle 15 at the end, the spraying main body 14 being provided with a color changing assembly 2, the spraying main body 14 being provided with a shielding assembly 3 and a cleaning assembly 4;

[0037] The color changing assembly 2 is used to change the color of the paint sprayed by the spraying nozzle 15, the color changing assembly 2 comprising a color changing groove 21 provided in the side wall of the spraying main body 14, the color changing groove 21 being provided with a color changing barrel 22 rotatably connected therein, the rotation of the color changing barrel 22 being driven by a drive motor 24, the drive motor 24 being installed in the spraying bin 13;

[0038] The output end of the driving motor 24 is fixedly connected with a driving shaft 25, the side wall of the driving shaft 25 is fixedly connected with a driving gear 26, the driving gear 26 is meshingly connected with a color changing gear 23, the color changing gear 23 is fixedly connected to the side wall of the color changing barrel 22, the color changing barrel 22 is provided with a paint groove 27, the top of the spraying bin 13 is provided with an adding hole 28, and the bottom of the paint groove 27 is in communication with the spraying groove 16.

[0039] Specifically, the color changing barrel 22 is rotationally connected in the color changing groove 21 of the side wall of the spraying main body 14, a plurality of independent paint grooves 27 are provided in the barrel, different color coatings can be supplemented through the adding hole 28, and the bottom of the paint groove 27 is in communication with the spraying groove 16. When changing color, the driving motor 24 is started to drive the driving shaft 25 to rotate, the driving gear 26 on the driving shaft 25 is in meshing transmission with the color changing gear 23 on the side wall of the color changing barrel 22, and the color changing barrel 22 is driven to rotate accurately. When the paint groove 27 corresponding to the target color is rotated to the position aligned with the spraying groove 16, the coating in the paint groove 27 flows into the spraying groove 16, and then is sprayed to the hub through the spraying nozzle 15; at the same time, the other paint grooves 27 are rotated to the closed state with the color changing barrel 22, the supply of non-target color coating is cut off, a single color changing action is completed, and the physical environment of the production line continuous operation is adapted.

[0040] The rotating color changing barrel 22 integrates a plurality of paint grooves 27, without reserving a large amount of pipeline and valve block installation space beside the spraying main body 14, so that the equipment floor area is greatly reduced, and the physical demand of compact layout of the production line is adapted. In terms of color changing efficiency, the color changing barrel 22 is quickly rotated and switched through gear meshing transmission, without interrupting the spraying operation for complex pipeline switching, so that the color changing time of a single group is greatly shortened, and the production line rhythm is improved.

[0041] The independent paint groove 27 avoids the advance mixing of different color coatings in the storage and supply process, and the accuracy of color switching in the color changing process is ensured through the accurate driving of the driving motor 24. In addition, the color changing assembly 2, the shielding assembly 3 and the cleaning assembly 4 are linked through a transmission structure, the shielding and cleaning processes can be started synchronously after the color changing action is triggered, the risks of residual material residue and cross contamination are reduced from the source, the pain points of long color changing time and large space occupation in the prior art are solved, and the product qualification rate and production benefit are indirectly improved.

[0042] The shielding assembly 3 is used for avoiding the pollution of the residual material cleaned out to the hub, the shielding assembly 3 comprises a shielding T-shaped rotating hole 32 provided in the bottom of the spraying main body 14, a shielding H-shaped rotating rod 33 and a shielding plate 31 are rotationally connected in the shielding T-shaped rotating hole 32;

[0043] The bottom of the drive shaft 25 is provided with a first belt groove 36, the side wall of the shielding I-shaped rotating rod 33 is provided with a second belt groove 37, and the spraying main body 14 is provided with a transmission groove 34.

[0044] Specifically, in the color changing process of the aluminum alloy wheel hub multi-color coating production line, the driving motor 24 drives the drive shaft 25 to rotate, the drive shaft 25 drives the shielding I-shaped rotating rod 33 to rotate in the shielding T-shaped rotating hole 32 through the first belt groove 36 at the bottom, the transmission belt 35 in the transmission groove 34 and the second belt groove 37 in the side wall of the shielding I-shaped rotating rod 33, and then drives the bottom shielding plate 31 to rotate synchronously. By virtue of the size difference between the first and second belt grooves 37, different rotating speeds of the color changing barrel 22 rotating a small circle and the shielding plate 31 rotating a circle are realized, the residual material of the spraying nozzle 15 during color changing is shielded by the semi-circular design of the shielding plate 31, and normal spraying is not affected. After the color changing barrel 22 rotates to the position, the bottom reset groove 610 triggers the hydraulic drive rod 67, the locking of the clamping assembly 6 is released through hydraulic transmission, the delay torsional spring 56 drives the shielding plate 31 to accurately shield the spraying nozzle 15, and the residual mixed coating is discharged through the waste discharge T-shaped groove 51 and the waste discharge guide groove 52.

[0045] Compared with the traditional independent shielding structure, the rotating speed is adapted by using belt transmission and groove wheel size difference, without additional driving mechanism, saving equipment space and energy consumption, and meeting the compact design requirements of the production line. The cooperation of the delay torsional spring 56 and the clamping assembly 6 ensures that the shielding plate 31 moves accurately and resets in time, provides sufficient time for complete discharge of the residual material, realizes efficient cleaning of the residual material with the waste discharge assembly 5, and reduces coating waste. The combination of the semi-circular shielding plate 31 design and the rotating speed control not only guarantees the shielding effect, but also does not interfere with normal spraying operation, significantly improving the production line beat and production efficiency.

[0046] The cleaning assembly 4 is used for cleaning the residual material in the spraying groove 16, and the cleaning assembly 4 comprises a lifting groove 41 provided in the bottom of the spraying main body 14, a lifting plate 42 slidably connected in the lifting groove 41, and a spraying nozzle 15 fixedly connected to the bottom of the lifting plate 42. The lifting groove 41 is communicated with a cleaning nozzle 48, and the side wall of the lifting groove 41 is communicated with a water inlet pipe 410.

[0047] The lifting plate 42 and the lifting groove 41 are connected by a lifting spring 43, the spraying nozzle 15 and the spraying groove 16 are connected by a connecting hose 44, the spraying main body 14 is provided with a cleaning groove 45, the cleaning groove 45 is communicated with the lifting groove 41, the side wall of the cleaning groove 45 is communicated with the cleaning nozzle 48 through a cleaning channel 49, the cleaning nozzle 48 is installed in an installation groove 46 provided in the spraying main body 14, a baffle 47 is installed in the installation groove 46, the baffle 47 is located above the cleaning nozzle 48, and a one-way valve 411 is installed in the water inlet pipe 410.

[0048] Specifically, the cleaning assembly 4 relies on the lifting groove 41, the lifting plate 42 and the communication structure at the bottom of the spraying main body 14 to realize the cleaning of the excess material. When changing color, the shielding plate 31 is rotated to abut against the bottom of the spraying nozzle 15, the lifting plate 42 at the top is driven to slide upward along the lifting groove 41, and the lifting spring 43 is compressed. The sliding of the lifting plate 42 makes the lifting groove 41 communicate with the cleaning groove 45, the cleaning liquid delivered by the water inlet pipe 410 is guided into the cleaning nozzle 48 in the mounting groove 46 through the cleaning groove 45 and the cleaning channel 49, and is precisely sprayed into the inner wall of the spraying groove 16 and the connection between the spraying nozzle 15 and the spraying groove 16 under the limiting and guiding of the baffle 47. At the same time, the spraying nozzle 15 is flexibly connected with the spraying groove 16 through the connecting hose 44, the waste liquid containing the excess material generated during the cleaning is returned along the spraying groove 16, and is discharged from the sewage outlet 53 through the waste T-shaped groove 51 and the waste drainage groove 52 of the shielding plate 31, thereby completing the closed-loop cleaning process.

[0049] The directional spraying design of the cleaning nozzle 48 of the scheme can accurately cover the gap and other areas prone to residual in the spraying groove 16, and cooperate with the circulation of the cleaning liquid to completely remove the excess material, avoid particle and color difference defects and subsequent color cross contamination, and significantly improve the product qualification rate. The flexible adaptive structure of the lifting spring 43 and the connecting hose 44 ensures that the position of the spraying nozzle 15 is adjustable and the connection is stable during the cleaning process, and is suitable for the continuous production environment of aluminum alloy hub coating. In addition, the cleaning and waste discharge system is designed in an integrated manner, without occupying additional equipment space, compared with the prior art, not only reduces the labor maintenance cost, but also improves the production line rhythm and coating quality stability, fully meeting the requirements of the Quanzhou preliminary examination on technical innovation and practicality.

[0050] The waste discharge assembly 5 is arranged in the shielding plate 31, and the waste discharge assembly 5 comprises a waste T-shaped groove 51 arranged on the surface of the shielding plate 31, a waste drainage groove 52 communicated with the bottom of the waste T-shaped groove 51, and a sewage outlet 53 arranged at the end of the waste drainage groove 52.

[0051] A delay groove 54 is arranged in the shielding I-shaped rotating rod 33, a delay fixed rod 55 is fixedly connected to the top of the shielding I-shaped rotating rod 33, and the delay groove 54 and the delay fixed rod 55 are connected through a delay torsional spring 56.

[0052] The waste discharge assembly 5 is used to completely remove the residual paint in the spraying nozzle 15 and the spraying groove 16, so as to avoid paint mixing during color changing. The waste discharge assembly 5 is connected with the time delay groove 54, the time delay fixing rod 55, the time delay torsional spring 56 and the clamping assembly 6 to realize time sequence cooperation through mechanical transmission and hydraulic control. After the color changing barrel 22 is rotated to a position, the bottom reset groove 610 drives the hydraulic driving rod 67 to slide upwards, drives the connecting disc 63 to lift through hydraulic transmission, and releases the locking of the time delay fixing rod 55. The time delay fixing rod 55 rotates under the action of the time delay torsional spring 56, drives the shielding plate 31 to rotate and shield the spraying nozzle 15. At this time, the new color paint groove 27 is connected with the spraying groove 16, and the output end of the spraying nozzle 15 is aligned with the waste discharge guide groove 52. Through starting spraying, the residual mixed paint is discharged, the time length of waste discharge is ensured by the reset slow time delay torsional spring 56, and the spraying nozzle 15 sprays pure new paint, so that the wheel hub spraying operation can be restored.

[0053] The waste discharge assembly 5 realizes efficient waste discharge through mechanical linkage and time delay design, greatly shortens the color changing time, and improves the continuous operation efficiency of the production line. No chemical solvent is used in the waste discharge process, which avoids corrosion of the surface of the aluminum alloy wheel hub and reduces environmental pollution caused by solvent volatilization, which meets the environmental protection requirements of the coating production line. Compared with a single cleaning structure, the cooperative design of the waste discharge assembly 5, the shielding plate 31 and the clamping assembly 6 ensures that the mixed paint is collected through the waste discharge guide groove 52, which not only avoids paint dripping and polluting the wheel hub to affect the coating appearance, but also reduces raw material waste and improves paint utilization. In addition, the material selection of the time delay torsional spring 56 can flexibly adapt to different viscosity paints, which has stronger adaptability, solves the quality problems of color difference and mixed color caused by paint residue during color changing in the prior art, and ensures the accuracy and surface texture of multi-color coating of the aluminum alloy wheel hub.

[0054] The clamping assembly 6 is arranged between the spraying main body 14 and the shielding H-shaped rotating rod 33, and the clamping assembly 6 comprises a clamping tooth groove 61 formed in the top of the time delay fixing rod 55, a clamping tooth rod 62 inserted into the clamping tooth groove 61, a connecting disc 63 fixedly connected to the top of the clamping tooth rod 62, the connecting disc 63 being slidingly connected in a cylindrical groove 64, and a reset spring 65 being connected between the cylindrical groove 64 and the connecting disc 63.

[0055] The spraying main body 14 is provided with a hydraulic piston groove 66, the hydraulic piston groove 66 is slidingly connected with a hydraulic driving rod 67, the top of the hydraulic driving rod 67 abuts against a color changing barrel 22, the hydraulic piston groove 66 and the hydraulic driving rod 67 are connected by a hydraulic spring 68, the hydraulic piston groove 66 and the connecting disc 63 are connected by a hydraulic transmission groove 69, and the bottom of the color changing barrel 22 is provided with a reset groove 610, the reset groove 610 is slidingly connected with the hydraulic driving rod 67.

[0056] Specifically, the snap-fit ​​assembly 6 is installed between the spraying body 14 and the masking I-beam rotating rod 33. The core achieves precise control through mechanical snap-fit ​​and hydraulic linkage. The snap-fit ​​toothed rod 62 is inserted into the snap-fit ​​toothed groove 61 at the top of the delay fixing rod 55. The connecting plate 63 connected to its top slides into the cylindrical groove 64 and is held in the snap-fit ​​state by the return spring 65. During color change, after the color change tank 22 rotates to its position, its bottom return groove 610 abuts against the hydraulic drive rod 67, causing the hydraulic drive rod 67 to slide upward along the hydraulic piston groove 66, compressing the hydraulic spring 68. The pressure change within the hydraulic piston groove 66 is transmitted to the connecting plate 63 via the hydraulic transmission groove 69, pushing the connecting plate 63 upward against the elastic force of the return spring 65, causing the snap-fit ​​toothed rod 62 to disengage from the snap-fit ​​toothed groove 61, thus releasing the lock on the delay fixing rod 55. At this time, the delay torsion spring 56 drives the delay fixing rod 55 to rotate, which drives the shielding plate 31 to accurately block the spray nozzle 15. After the mixed paint is discharged, the reset spring 65 pushes the connecting plate 63 and the locking toothed rod 62 to reset and re-lock into the tooth groove.

[0057] Through a combined hydraulic and mechanical locking design, the masking plate 31 automatically unlocks after color change, ensuring precise alignment of the masking action with the color change process and adapting to the continuous operation environment of the production line. The meshing structure of the locking toothed groove 61 and the toothed rod provides reliable locking, preventing malfunctions of the masking plate 31 due to production line vibration and ensuring coating stability. The cooperation between the return spring 65 and the hydraulic transmission ensures rapid locking and unlocking responses, eliminating the need for additional drive mechanisms. This saves equipment space and reduces energy consumption, meeting the requirements of Quanzhou's pre-approval process for compact and efficient design. Compared to traditional manual control or electromagnetic locking structures, this component eliminates the need for complex circuitry and manual intervention, reducing potential failure points and maintenance costs. Furthermore, the delayed unlocking design allows sufficient time for cleaning up residual materials, significantly reducing the risk of cross-contamination and improving product qualification rates.

[0058] Example 2: The spraying process in the multi-color coating production line for aluminum alloy wheels includes:

[0059] S1. Clean, degrease, and grind the aluminum alloy wheel hub. If necessary, apply primer and cure it to ensure that the surface is clean and has good adhesion.

[0060] S2. Based on the multi-color design scheme, use masking materials, special jigs or color templates to divide the spraying area and clarify the construction sequence of each color;

[0061] S3. Spray the corresponding color paint onto the target area in the preset order. After each color is sprayed and cured, remove the corresponding isolation device.

[0062] S4. Fixture positioning and template calibration ensure precise matching of different color boundaries, while gradient effects are achieved by adjusting spraying parameters to achieve color fusion.

[0063] S5, after all color spraying is finished, the product is baked, cured, cooled, shaped and protected by finishing, so as to improve the stability of the coating and the surface performance.

[0064] The working principle of the application is as follows:

[0065] During the color changing operation, the driving motor 24 is started and drives the driving shaft 25 and the driving gear 26 to rotate, and through the meshing transmission of the driving gear 26 and the color changing gear 23, the color changing barrel 22 is driven to rotate. During the rotation of the color changing barrel 22, the current connected paint tank 27 in the color changing barrel 22 is closed and disconnected with the spraying tank 16, and at the same time, another group of paint tanks 27 is rotated to be aligned with and connected with the spraying tank 16, so as to realize the color changing spraying requirement of multi-color coating and meet the multi-color coating operation of the aluminum alloy hub. The adding hole 28 is used to supplement the coating in each paint tank 27, so as to ensure the continuous coating operation.

[0066] In order to prevent the coating remaining in the spraying tank 16 and the spraying nozzle 15 from dropping to the hub surface and causing pollution during the color changing process, the shielding plate 31 at the bottom of the spraying main body 14 is synchronously rotated during the rotation of the color changing barrel 22. When the driving shaft 25 rotates, the transmission belt 35 at the bottom of the driving shaft 25 transmits power through the transmission groove 34, the first belt groove 36 and the second belt groove 37, drives the shielding H-shaped rotating rod 33 to rotate, and then drives the shielding plate 31 to shield the spraying nozzle 15. Since the rotation circle number requirements of the color changing barrel 22 and the shielding plate 31 are different, the first belt groove 36 and the second belt groove 37 are designed to be different sizes, so that the transmission effect that the shielding plate 31 rotates one circle when the color changing barrel 22 rotates a small circle is realized, so as to avoid the interference of the shielding plate 31 to the normal spraying operation. The semicircular structure of the shielding plate 31 is also designed to achieve the technical purpose.

[0067] The cleaning assembly 4 is used for preliminary cleaning of the spraying tank 16 and the spraying nozzle 15 during the color changing process. When the shielding plate 31 rotates, the edge thereof abuts against the bottom of the spraying nozzle 15 and pushes the spraying nozzle 15 to slide upward, the lifting plate 42 at the top of the spraying nozzle 15 slides upward, so that the cleaning liquid in the lifting groove 41 is sprayed out from the cleaning nozzle 48 through the communication path of the cleaning groove 45 and the cleaning channel 49, the inside of the spraying tank 16 is preliminarily cleaned, and the operation pressure of the subsequent waste cleaning is reduced.

[0068] The waste discharge assembly 5 is used to completely remove the residual raw material in the spraying nozzle 15 and the spraying groove 16, so as to avoid the mixing of different color paints affecting the coating quality. Through the cooperative design of the delay groove 54, the delay fixing rod 55, the delay torsional spring 56 and the clamping assembly 6, the rotating action of the shielding plate 31 and the color changing barrel 22 is formed into asynchronous linkage. After the color changing barrel 22 is rotated to the position, the reset groove 610 at the bottom of the color changing barrel 22 drives the hydraulic driving rod 67 to slide upward, drives the connecting disc 63 to move upward through the hydraulic transmission, and releases the locking of the delay fixing rod 55. At this time, the delay fixing rod 55 is rotated under the elastic force of the delay torsional spring 56, drives the shielding plate 31 to rotate and shield the spraying nozzle 15, and at the same time, the paint groove 27 and the spraying groove 16 are kept in communication, and the output end of the spraying nozzle 15 is connected with the waste discharge guide groove 52. Starting the spraying action can discharge the mixed residual paint in the spraying nozzle 15 and the spraying groove 16, and after the spraying nozzle 15 sprays the pure new paint, the normal coating operation of the hub can be restored. The delay torsional spring 56 is selected from a material with a slow reset rate, so as to ensure that the mixed paint is completely discharged.

[0069] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A spraying device in a multi-color coating production line for aluminum alloy wheels, characterized in that, The system includes a production component (1), which includes a base (11), a transport platform (12) installed in the base (11), a spraying chamber (13) installed on the base (11), a spraying body (14) installed in the spraying chamber (13), a spraying groove (16) opened in the spraying body (14), a spraying nozzle (15) installed at the end of the spraying groove (16), a color changing component (2) provided on the side wall of the spraying body (14), and a masking component (3) and a cleaning component (4) provided inside the spraying body (14). The color-changing component (2) is used to change the paint color sprayed by the spray nozzle (15). The color-changing component (2) includes a color-changing groove (21) opened on the side wall of the spray body (14). A color-changing barrel (22) is rotatably connected in the color-changing groove (21). The rotation of the color-changing barrel (22) is driven by a drive motor (24). The drive motor (24) is installed in the spray chamber (13). The masking assembly (3) is used to prevent the cleaned-out material from contaminating the wheel hub. The masking assembly (3) includes a masking T-shaped rotating hole (32) opened at the bottom of the spraying body (14). A masking I-shaped rotating rod (33) and a masking plate (31) are rotatably connected in the masking T-shaped rotating hole (32). The cleaning component (4) is used to clean the residual material in the spraying tank (16). The cleaning component (4) includes a lifting tank (41) opened at the bottom of the spraying body (14). A lifting plate (42) is slidably connected in the lifting tank (41). The bottom of the lifting plate (42) is fixedly connected to the spraying nozzle (15). The lifting tank (41) is connected to a cleaning nozzle (48). The side wall of the lifting tank (41) is connected to a water inlet pipe (410). The lifting plate (42) and the lifting groove (41) are connected by a lifting spring (43), and the spray nozzle (15) and the spray groove (16) are connected by a connecting hose (44). A cleaning groove (45) is provided in the spray body (14). The cleaning groove (45) is connected to the lifting groove (41). The side wall of the cleaning groove (45) is connected to the cleaning nozzle (48) through a cleaning channel (49). The cleaning nozzle (48) is installed in the mounting groove (46). The mounting groove (46) is opened in the spray body (14). A baffle (47) is installed in the mounting groove (46). The baffle (47) is located above the cleaning nozzle (48). A one-way valve (411) is installed in the water inlet pipe (410).

2. The spraying device in the multi-color coating production line for aluminum alloy wheels according to claim 1, characterized in that, The output end of the drive motor (24) is fixedly connected to the drive shaft (25), and the side wall of the drive shaft (25) is fixedly connected to the drive gear (26). The drive gear (26) is meshed with the color-changing gear (23). The color-changing gear (23) is fixedly connected to the side wall of the color-changing barrel (22). The color-changing barrel (22) is provided with a paint tank (27). The top of the spraying chamber (13) is provided with an addition hole (28). The bottom of the paint tank (27) is connected to the spraying tank (16).

3. The spraying device in the multi-color coating production line for aluminum alloy wheels according to claim 2, characterized in that, The bottom of the drive shaft (25) has a first belt groove (36), the side wall of the shielding I-beam rotating rod (33) has a second belt groove (37), the spraying body (14) has a transmission groove (34), and the first belt groove (36) and the second belt groove (37) are connected by a transmission belt (35).

4. The spraying device in the multi-color coating production line for aluminum alloy wheels according to claim 1, characterized in that, The shielding plate (31) is provided with a waste discharge component (5), which includes a waste discharge T-shaped groove (51) opened on the surface of the shielding plate (31). The bottom of the waste discharge T-shaped groove (51) is connected to a waste discharge diversion groove (52), and the end of the waste discharge diversion groove (52) is provided with a sewage outlet (53).

5. The spraying device in the multi-color coating production line for aluminum alloy wheels according to claim 3, characterized in that, The shielding I-beam rotating rod (33) has a delay groove (54) inside. The top of the shielding plate (31) is fixedly connected to a delay fixing rod (55). The delay groove (54) and the delay fixing rod (55) are connected by a delay torsion spring (56). The bottom of the delay fixing rod (55) is fixedly connected to the shielding plate (31).

6. The spraying device in the multi-color coating production line for aluminum alloy wheels according to claim 5, characterized in that, A snap-fit ​​assembly (6) is provided between the spraying body (14) and the masking I-beam rotating rod (33). The snap-fit ​​assembly (6) includes a snap-fit ​​groove (61) opened on the top of the delay fixing rod (55). A snap-fit ​​tooth rod (62) is inserted into the snap-fit ​​groove (61). A connecting plate (63) is fixedly connected to the top of the snap-fit ​​tooth rod (62). The connecting plate (63) is slidably connected in the cylindrical groove (64). The cylindrical groove (64) and the connecting plate (63) are connected by a return spring (65).

7. The spraying device in the multi-color coating production line for aluminum alloy wheels according to claim 6, characterized in that: The spraying body (14) has a hydraulic piston groove (66) inside, and a hydraulic drive rod (67) is slidably connected inside the hydraulic piston groove (66). The top of the hydraulic drive rod (67) abuts against the color change bucket (22). The hydraulic piston groove (66) and the hydraulic drive rod (67) are connected by a hydraulic spring (68). The hydraulic piston groove (66) is connected to the connecting plate (63) by a hydraulic transmission groove (69). A return groove (610) is opened at the bottom of the color change bucket (22). The hydraulic drive rod (67) is slidably connected inside the return groove (610).

8. The spraying process in the multi-color coating production line for aluminum alloy wheels, using the spraying device in the multi-color coating production line for aluminum alloy wheels as described in claim 1, is characterized in that... include: S1. Clean, degrease, and grind the aluminum alloy wheel hub, apply primer and cure it to ensure that the surface is clean and has good adhesion. S2. Based on the multi-color design scheme, use masking materials, special jigs or color templates to divide the spraying area and clarify the construction sequence of each color; S3. Spray the corresponding color paint onto the target area in the preset order. After each color is sprayed and cured, remove the corresponding isolation device. S4. Fixture positioning and template calibration ensure precise matching of different color boundaries, while gradient effects are achieved by adjusting spraying parameters to achieve color fusion. S5. After all colors are sprayed, the product is baked, cured, cooled and shaped, and then coated with a protective layer to improve the stability and surface performance of the coating.

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