Commercial vehicle aluminum alloy wheel surface treatment process and device

Abstract

The invention relates to the technical field of wheel treatment, in particular to a commercial vehicle aluminum alloy wheel surface treatment process and device.The commercial vehicle aluminum alloy wheel surface treatment device comprises a supporting mechanism, an aluminum alloy wheel is slidably placed at the top end of the supporting mechanism, a driving motor is fixedly installed at the rear end of the supporting mechanism, and a first gear is fixedly installed at the front end of the driving motor; the supporting mechanism comprises covering devices and a positioning part, the covering devices are fixedly installed on the two sides of the top of the positioning part, each covering device comprises a first rack, an extending sleeve frame, a first spring, a guide rod, an L-shaped supporting vertical frame, a connecting frame, a protective sleeve and a second rack, the connecting frame is fixedly installed at the rear end of the protective sleeve, and the guide rod is fixedly installed on the right side of the connecting frame; the L-shaped supporting vertical frame is connected to the outer ring of the guide rod in a sliding and sleeving mode, and the first spring is fixedly installed between the connecting frame and the L-shaped supporting vertical frame. And through the arrangement of the supporting mechanism, the purposes that the aluminum alloy wheel surface spraying treatment equipment carries out alignment type protection and colored essential oil deposition is prevented are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of wheel processing, in particular to a surface processing process and device for aluminum alloy wheels of commercial vehicles. Background Art

[0002] Commercial vehicles refer to vehicles mainly used for commercial transportation, including trucks, buses, special vehicles, etc. They play an important role in logistics, passenger transportation, engineering and other fields. Compared with private cars, commercial vehicles usually have a larger load capacity to meet the needs of cargo transportation or personnel transportation. Commercial vehicles can be customized according to different transportation needs, such as closed trucks, open trucks, buses, special vehicles, etc. Commercial vehicles need to have strong durability in harsh operating environments to ensure the stable operation of the vehicle.

[0003] Aluminum alloy wheels refer to wheels made of aluminum alloy materials. Aluminum alloy wheels are often used on commercial vehicles. The lightweight design of aluminum alloy wheels can reduce the total weight of the vehicle, thereby improving fuel efficiency and reducing energy consumption. At the same time, aluminum alloy wheels have good durability and reduce maintenance costs. Aluminum alloy wheels have good shock absorption properties, which can reduce vibration and noise during driving and improve ride comfort.

[0004] At present, when using the aluminum alloy wheel surface spraying treatment equipment on the market, it is necessary to stick a protective cover on the outer ring of the aluminum alloy wheel, which requires a certain amount of time to prepare. At the same time, since the protective cover is a temporary splicing, the aluminum alloy wheel will leak liquid during spraying. As a result, the existing aluminum alloy wheel surface spraying treatment equipment cannot perform the functions of counter-position protection and preventing colored essential oil deposition when in use. Therefore, a device is needed to improve the above problems. Summary of the invention

[0005] In view of the problems in the prior art, the present invention provides a surface treatment process and device for aluminum alloy wheels of commercial vehicles.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a surface treatment process of aluminum alloy commercial vehicle wheels, comprising the following steps: S1, pre-treatment, pre-treatment of aluminum alloy wheels to remove oil, oxides and other impurities on the wheel surface; S2, colored essential oil spraying, spraying colored essential oil on the aluminum alloy wheel after pretreatment; S3, baking treatment, baking the aluminum alloy wheel at high temperature to melt the powder coating and solidify it on the wheel surface; S4, neutral salt spray test, the aluminum alloy wheels are passivated and sealed, and the treated aluminum alloy wheels are subjected to neutral salt spray test to evaluate the corrosion resistance of the aluminum alloy wheels.

[0007] S1 pre-treatment process, including the following steps: 1. Use a high-pressure water gun to perform preliminary cleaning on the surface of the aluminum alloy wheel to remove large particles of impurities and dirt on the surface; 2. Use a sandblasting machine to blast the wheel surface to remove tiny particles and oxides and increase the surface roughness. The blasting medium is corundum sand, the blasting pressure is controlled at 4-7MPar, and the blasting time is 20-30s; 3. Use alkaline degreasing agent to degrease the aluminum alloy wheels to remove oil and grease on the surface of the aluminum alloy wheels. The degreasing temperature during the degreasing process is controlled at 50-70℃ and the degreasing time is controlled at 5-15min; 4. After degreasing, the aluminum alloy wheels are pickled. Hydrochloric acid solution is selected as the pickling solution to remove the oxides and residues on the surface of the aluminum alloy wheels. After pickling, the aluminum alloy wheels are rinsed with clean water to remove the acid residue; 5. The surface of the aluminum alloy wheel is activated by an activator, wherein the activator is a mixed solution of fumaric acid and hydrofluoric acid, wherein the solvent of the mixed solution is water, the concentration of fumaric acid is controlled to be 20-30 g / L, and the concentration of hydrofluoric acid is controlled to be 3-5 mL / L.

[0008] S2 colored essential oil spraying process, including the following steps: 1. Preheat the aluminum alloy wheels before spraying. The preheating temperature should be controlled at 115-125℃ and the preheating time should be controlled at 10-15 minutes. 2. Hang the aluminum alloy wheels on the conveyor line and spray them evenly with a spray gun. During the spraying process, the spray gun distance is controlled at 150-300mm, the spraying speed is controlled at 0.5-1.5m / min, and the powder flow rate is controlled at 200-400g / min; 3. After spraying, send the aluminum alloy wheel to the leveling room to allow the powder coating to level naturally on the wheel surface; 4. For electrostatic powder, choose epoxy-polyester mixed powder coating, and for electrostatic spray gun, equip the closed powder spray room with a recovery system to recycle the powder while spraying.

[0009] The S3 baking process includes the following steps: 1. Send the aluminum alloy wheels into the curing furnace for preheating treatment, so that the surface temperature of the wheels gradually rises to the baking temperature, and the preheating temperature is controlled at 100-150℃; 2. After preheating, set the baking temperature and bake the wheels. The baking temperature is controlled at 160-200℃ and the baking time is controlled at 15-30min. 3. After baking, the wheels enter the cooling chamber for natural cooling; 4. After the spraying and baking process is completed, the aluminum alloy wheels are passivated; 5. Choose chromium-free passivation liquid for aluminum and immerse the wheels in the passivation liquid for 5-10 minutes. After immersion, rinse with clean water and dry.

[0010] S4 neutral salt spray test, including the following steps: 1. Carry out sealing treatment on the aluminum alloy wheels. Soak the aluminum alloy wheels in the sealant for 30-60 seconds. After soaking, take them out and bake them at 120-150℃ for 30-35 minutes: 2. Set the salt spray test conditions. Set the test conditions of the salt spray test according to national standards and customer requirements. The test conditions include test temperature, salt spray concentration and relative humidity in the test chamber. Prepare the test chamber and adjust it to the set test conditions; 3. Salt spray test: place the aluminum alloy wheels that have completed surface treatment in a salt spray test chamber, start the salt spray test chamber, and begin a continuous spray test; Regular observation and record: During the test, observe the changes on the wheel surface every 24 hours and record the corrosion degree and time. The corrosion degree shall be assessed by visual inspection or with the aid of a magnifying glass or microscope; Evaluate the test results and keep the test going until the predetermined test time is reached, where the test time is controlled to be 720 hours. After the test, check the wheels. If there is no obvious corrosion on the wheels after 720 hours of salt spray test, the test is considered successful. If corrosion occurs, the test is considered a failure. Record the type, degree and location of corrosion, and prepare a salt spray test report based on the observed and recorded data.

[0011] Specifically, the spraying device in the colored essential oil spraying process includes a supporting mechanism, an aluminum alloy wheel is slidably placed on the top of the supporting mechanism, a driving motor is fixedly installed on the rear end of the supporting mechanism, and a first gear is fixedly installed on the front end of the driving motor. The supporting mechanism includes a covering device and a positioning component, the covering device is fixedly installed on both sides of the top of the positioning component, the covering device includes a first rack, an extension sleeve, a first spring, a guide rod, an L-shaped supporting vertical frame, a connecting frame, a protective sleeve and a second rack, the connecting frame is fixedly installed on the rear end of the protective sleeve, the guide rod is fixedly installed on the right side of the connecting frame, the L-shaped supporting vertical frame is slidably sleeved on the outer ring of the guide rod, the first spring is fixedly installed between the connecting frame and the L-shaped supporting vertical frame, and the first spring is located on the outer ring of the guide rod, the second rack is fixedly installed on the top of the side end of the L-shaped supporting vertical frame close to the guide rod, the first rack is fixedly installed on one end of the L-shaped supporting vertical frame close to the connecting frame, and the extension sleeve is slidably sleeved on the bottom of the outer ring of the L-shaped supporting vertical frame.

[0012] Specifically, the positioning component includes an alignment device, a transmission device and a connecting device. The transmission device is fixedly installed at the top rear end of the connecting device, and the alignment device is rotatably installed at the inner front end of the transmission device.

[0013] Specifically, the alignment device includes a collecting chamber, a stirring blade, a nozzle, a sprayer, a positioning sleeve, a second gear and a support frame. The sprayer is fixedly installed at the bottom end of the collecting chamber, the nozzle is fixedly installed at the bottom end of the sprayer, the positioning sleeve is fixedly installed at the bottom of the outer ring of the collecting chamber, the support frame is fixedly installed at the bottom center of the collecting chamber, the second gear is rotatably installed on the outer ring of the support frame, and the second gear is distributed in an annular shape, the stirring blade is fixedly installed at the bottom end of the second gear, and the transmission device includes a first pulley, a support ring, a belt, a support base, a third gear, a second pulley, a top frame and a gear ring The third gear is rotatably mounted on the top rear end of the support base, the support ring is fixedly mounted on the top front end of the support base, the second pulley is fixedly mounted on the top of the third gear, the belt is sleeved on the outer ring of the second pulley, the first pulley is rotatably mounted inside the end of the belt away from the second pulley, the top frame is fixedly mounted on the top of the support base close to the support ring, the gear ring is fixedly mounted on the front end of the top frame close to the first pulley, the connecting device includes a protective seat, a support platform and a hydraulic cylinder, the hydraulic cylinder is fixedly mounted on the bottom end of the support platform, and the protective seat is fixedly mounted on the top of the hydraulic cylinder.

[0014] Specifically, the extension sleeve is fixedly installed on both sides of the top of the support platform, the support base is fixedly installed at the top rear end of the support platform, the outer ring top of the collecting chamber is fixedly installed on the inner ring of the first pulley, the second gear is meshed with the ring gear, and the first rack is meshed with the first gear.

[0015] Specifically, the second rack is flush with the third gear, the positioning sleeve is rotatably sleeved on the support ring, the outer ring of the protective seat is fitted with the inner ring of the aluminum alloy wheel, an arc groove is provided at the center of the side end of the protective sleeve away from the second rack, a pipe is installed between the sprayer and the collection chamber, and the length of the nozzle is equal to the diameter of the aluminum alloy wheel.

[0016] Specifically, the support platform further comprises an extension guide plate and a limiting circular plate, wherein the extension guide plate is fixedly mounted at the front end center of the support platform, and the limiting circular plate is fixedly mounted at the top rear end of the support platform.

[0017] Beneficial effects of the present invention: First, when the present invention is started by a driving motor, the first gear can drive the two first racks to move simultaneously toward the inner center direction of the support platform, so that the protective sleeve can fit on the outer ring surface of the aluminum alloy wheel, thereby preventing the essential oil from entering the inner ring of the aluminum alloy wheel when the aluminum alloy wheel is sprayed, and the top of the protective sleeve is in a closed state, so that the essential oil can be reduced from splashing outward during spraying. When started by the hydraulic cylinder, the protective seat can be driven to enter the bottom of the inner ring of the aluminum alloy wheel, so that the protective seat can block the inner ring of the aluminum alloy wheel, prevent the essential oil from entering the inner ring of the aluminum alloy wheel, and complete the work of counter-positioning protection of the aluminum alloy wheel.

[0018] Secondly, the present invention can also drive the second rack through the third gear when protecting the aluminum alloy wheel through the protective sleeve, thereby driving the second pulley to rotate. At the same time, the second pulley can drive the first pulley and the collecting chamber to rotate through the belt. Therefore, when the sprayer is started, the nozzle can rotate around the axis on the top of the aluminum alloy wheel, so that the colored essential oil can be evenly sprayed onto the aluminum alloy wheel. Moreover, when the collecting chamber rotates, the second gear can be driven to rotate on the inner ring of the gear ring, so that the stirring blade can rotate at the inner bottom end of the collecting chamber, and the colored essential oil accumulated at the inner bottom end of the collecting chamber can be stirred to avoid deposition, thereby completing the work of preventing the colored essential oil from depositing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the main body of the present invention from the front perspective; Figure 2 It is a schematic diagram of the three-dimensional structure of the support mechanism of the present invention from a front perspective; Figure 3 This is a schematic diagram of the three-dimensional structure of the covering device of the present invention from a front perspective; Figure 4 It is a schematic diagram of the three-dimensional structure of the positioning component in the present invention from a front perspective; Figure 5 It is a partial cutaway view of the alignment device in the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the transmission device of the present invention from the front perspective; Figure 7 It is a schematic diagram of the three-dimensional structure of the connecting device of the present invention from the front perspective; Figure 8 It is a schematic diagram of the three-dimensional structure from the front perspective of the second embodiment of the support platform of the present invention.

[0021] In the figure: 1-support mechanism, 2-drive motor, 3-first gear, 4-aluminum alloy wheel, 5-covering device, 6-positioning component, 7-first rack, 8-extension sleeve, 9-first spring, 10-guide rod, 11-L-shaped support vertical frame, 12-connecting frame, 13-protective sleeve, 14-second rack, 15-alignment device, 16-transmission device, 17-connecting device, 18-collecting chamber, 19-stirring blade, 20-nozzle, 21-sprayer, 22-positioning sleeve, 23-second gear, 24-support frame, 25-first pulley, 26-support ring, 27-belt, 28-support base, 29-third gear, 30-second pulley, 31-top frame, 32-gear ring, 33-protective seat, 34-support platform, 35-hydraulic cylinder, 36-extension guide plate, 37-limiting circular plate. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] The present invention is further described below in conjunction with the accompanying drawings.

[0025] Embodiment 1, a surface treatment process of a commercial vehicle aluminum alloy wheel of the present invention comprises the following steps: S1, pre-treatment, pre-treatment of the aluminum alloy wheel 4 to remove oil, oxides and other impurities on the wheel surface; S2, colored essential oil spraying, spraying colored essential oil on the aluminum alloy wheel 4 after pretreatment; S3, baking treatment, baking the aluminum alloy wheel 4 at high temperature to melt the powder coating and solidify it on the wheel surface; S4, neutral salt spray test, passivation and sealing treatment are performed on the aluminum alloy wheel 4, and the treated aluminum alloy wheel 4 is subjected to a neutral salt spray test to evaluate the corrosion resistance of the aluminum alloy wheel 4.

[0026] S1 pre-treatment process, including the following steps: 1. Use a high-pressure water gun to preliminarily clean the surface of the aluminum alloy wheel 4 to remove large particles of impurities and dirt on the surface; 2. Use a sandblasting machine to blast the wheel surface to remove tiny particles and oxides and increase the surface roughness. The blasting medium is corundum sand, the blasting pressure is controlled at 4-7MPar, and the blasting time is 20-30s; 3. Use an alkaline degreasing agent to degrease the aluminum alloy wheel 4 to remove oil and grease on the surface of the aluminum alloy wheel 4. The degreasing temperature during the degreasing process is controlled at 50-70°C and the degreasing time is controlled at 5-15 minutes; 4. After degreasing, the aluminum alloy wheel 4 is pickled, and hydrochloric acid solution is selected as the pickling solution to remove oxides and residues on the surface of the aluminum alloy wheel 4. After pickling, the aluminum alloy wheel 4 is rinsed with clean water to remove acid residues; 5. The surface of the aluminum alloy wheel 4 is activated by an activator, wherein the activator is a mixed solution of fumaric acid and hydrofluoric acid, wherein the solvent of the mixed solution is water, the concentration of fumaric acid is controlled to be 20-30 g / L, and the concentration of hydrofluoric acid is controlled to be 3-5 mL / L.

[0027] S2 colored essential oil spraying process, including the following steps: 1. Preheat the aluminum alloy wheel 4 before spraying. The preheating temperature should be controlled at 115-125℃ and the preheating time should be controlled at 10-15 minutes; 2. Hang the aluminum alloy wheel 4 on the conveyor line and spray it evenly with a spray gun. During the spraying process, the spray gun distance is controlled at 150-300mm, the spraying speed is controlled at 0.5-1.5m / min, and the powder flow rate is controlled at 200-400g / min; 3. After spraying, send the aluminum alloy wheel 4 to the leveling room to allow the powder coating to level naturally on the wheel surface; 4. For electrostatic powder, choose epoxy-polyester mixed powder coating, and for electrostatic spray gun, equip the closed powder spray room with a recovery system to recycle the powder while spraying.

[0028] The S3 baking process includes the following steps: 1. Send the aluminum alloy wheel 4 into the curing furnace for preheating treatment, so that the surface temperature of the wheel gradually rises to the baking temperature, and the preheating temperature is controlled at 100-150℃; 2. After preheating, set the baking temperature and bake the wheels. The baking temperature is controlled at 160-200℃ and the baking time is controlled at 15-30min. 3. After baking, the wheels enter the cooling chamber for natural cooling; 4. After the spraying and baking process is completed, the aluminum alloy wheel 4 is passivated; 5. Choose chromium-free passivation liquid for aluminum and immerse the wheels in the passivation liquid for 5-10 minutes. After immersion, rinse with clean water and dry.

[0029] S4 neutral salt spray test, including the following steps: 1. Perform sealing treatment on the aluminum alloy wheel 4. Soak the aluminum alloy wheel 4 in the sealant for 30-60 seconds. After soaking, take it out and bake it at 120-150℃ for 30-35 minutes: 2. Set the salt spray test conditions. Set the test conditions of the salt spray test according to national standards and customer requirements. The test conditions include test temperature, salt spray concentration and relative humidity in the test chamber. Prepare the test chamber and adjust it to the set test conditions; 3. Salt spray test: place the aluminum alloy wheel 4 that has completed the surface treatment in a salt spray test chamber, start the salt spray test chamber, and start a continuous spray test; Regular observation and record: During the test, observe the changes on the wheel surface every 24 hours and record the corrosion degree and time. The corrosion degree shall be assessed by visual inspection or with the aid of a magnifying glass or microscope; Evaluate the test results and keep the test going until the predetermined test time is reached, where the test time is controlled to be 720 hours. After the test, check the wheels. If there is no obvious corrosion on the wheels after 720 hours of salt spray test, the test is considered successful. If corrosion occurs, the test is considered a failure. Record the type, degree and location of corrosion, and prepare a salt spray test report based on the observed and recorded data.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 A surface treatment process and device for aluminum alloy wheels of commercial vehicles of the present invention comprises a support mechanism 1, an aluminum alloy wheel 4 is slidably placed on the top of the support mechanism 1, a driving motor 2 is fixedly installed at the rear end of the support mechanism 1, a first gear 3 is fixedly installed at the front end of the driving motor 2, the support mechanism 1 comprises a covering device 5 and a positioning component 6, the covering device 5 is fixedly installed on both sides of the top of the positioning component 6, the covering device 5 comprises a first rack 7, an extension sleeve 8, a first spring 9, a guide rod 10, an L-shaped support vertical frame 11, a connecting frame 12, a protective cover 13 and a second rack 14. The connecting frame 12 is fixedly installed at the rear end of the protective sleeve 13, the guide rod 10 is fixedly installed on the right side of the connecting frame 12, the L-shaped support vertical frame 11 is slidably sleeved on the outer ring of the guide rod 10, the first spring 9 is fixedly installed between the connecting frame 12 and the L-shaped support vertical frame 11, and the first spring 9 is located at the outer ring of the guide rod 10, the second rack 14 is fixedly installed on the top of the side end of the L-shaped support vertical frame 11 close to the guide rod 10, the first rack 7 is fixedly installed on one end of the L-shaped support vertical frame 11 close to the connecting frame 12, and the extension sleeve 8 is slidably sleeved on the bottom of the outer ring of the L-shaped support vertical frame 11.

[0031] like Figure 4 The positioning component 6 includes a positioning device 15, a transmission device 16 and a connecting device 17. The transmission device 16 is fixedly installed at the top rear end of the connecting device 17, and the positioning device 15 is rotatably installed at the inner front end of the transmission device 16.

[0032] like Figure 5 , Figure 6 and Figure 7The alignment device 15 includes a collecting chamber 18, a stirring blade 19, a nozzle 20, a sprayer 21, a positioning sleeve 22, a second gear 23 and a support frame 24. The sprayer 21 is fixedly mounted at the bottom end of the collecting chamber 18, the nozzle 20 is fixedly mounted at the bottom end of the sprayer 21, the positioning sleeve 22 is fixedly mounted at the bottom of the outer ring of the collecting chamber 18, the support frame 24 is fixedly mounted at the bottom center of the collecting chamber 18, the second gear 23 is rotatably mounted on the outer ring of the support frame 24, and the second gear 23 is distributed in an annular shape, the stirring blade 19 is fixedly mounted at the bottom end of the second gear 23, and the transmission device 16 includes a first pulley 25, a support ring 26, a belt 27, a support base 28, a third gear 29, a second pulley 30, a top frame 31 and a gear ring 32, and the third gear 29 is rotatably mounted on the top of the support base 28 At the rear end, the support ring 26 is fixedly mounted on the top front end of the support base 28, the second pulley 30 is fixedly mounted on the top end of the third gear 29, the belt 27 is sleeved on the outer ring of the second pulley 30, and the first pulley 25 is rotatably mounted inside the end of the belt 27 away from the second pulley 30. The top frame 31 is fixedly mounted on the top of the support base 28 close to the support ring 26, and the gear ring 32 is fixedly mounted on the front end of the top frame 31 close to the first pulley 25. The connecting device 17 includes a protective seat 33, a support platform 34 and a hydraulic cylinder 35. The hydraulic cylinder 35 is fixedly mounted on the bottom end of the support platform 34, and the protective seat 33 is fixedly mounted on the top end of the hydraulic cylinder 35. A through hole compatible with the protective seat 33 is opened through the center of the top end of the support platform 34, so that the protective seat 33 can be allowed to slide up and down inside the support platform 34.

[0033] The extension sleeve 8 is fixedly mounted on both sides of the top of the support platform 34, the support base 28 is fixedly mounted on the top rear end of the support platform 34, the top of the outer ring of the collecting chamber 18 is fixedly mounted on the inner ring of the first pulley 25, the second gear 23 is meshed with the gear ring 32, the first rack 7 is meshed with the first gear 3, the second rack 14 is flush with the third gear 29, the positioning sleeve 22 is rotatably sleeved on the support ring 26, the outer ring of the protective seat 33 is fitted with the inner ring of the aluminum alloy wheel 4, and an arc groove is opened at the center of the side end of the protective sleeve 13 away from the second rack 14, a pipe is installed between the sprayer 21 and the collecting chamber 18, and the length of the nozzle 20 is equal to the diameter of the aluminum alloy wheel 4.

[0034] The working principle of Example 1 is as follows: when in use, the aluminum alloy wheel 4 is first moved and placed at the top center of the support platform 34, and then the hydraulic cylinder 35 is started to drive the protective seat 33 to move upward until the top of the protective seat 33 fits with the inner top of the aluminum alloy wheel 4, and the outer ring of the protective seat 33 fits with the inner ring of the aluminum alloy wheel 4, so that the interior of the aluminum alloy wheel 4 can be closed to prevent the colored essential oil from contacting the inner wall of the aluminum alloy wheel 4 when the surface of the aluminum alloy wheel 4 is sprayed, and when the protective seat 33 enters the interior of the aluminum alloy wheel 4, the aluminum alloy wheel 4 can also be restricted to the top center of the support platform 34, so as to improve the docking accuracy between the protective cover 13 and the aluminum alloy wheel 4, and then the colored essential oil can be poured into the interior of the collection cavity 18. Then, the driving motor 2 is started to drive the first gear 3 to rotate, and the two first racks 7 are meshed with the first gear 3, so that when the first gear 3 rotates, it can drive the first rack 7 to move toward the direction close to the inner center of the support platform 34 at the same time. When the first rack 7 moves to half of the stroke, the two protective sleeves 13 can fit with the outer ring surface of the aluminum alloy wheel 4. Then, the sprayer 21 can be started so that the nozzle 20 can spray colored essential oil on the surface of the aluminum alloy wheel 4. The sprayer 21 is connected to the nozzle 20, and the sprayer 21 is connected to the collection chamber 18 through a pipeline, so that the colored essential oil can be replenished to the inside of the sprayer 21. Then, when the protective sleeve 13 contacts the surface of the aluminum alloy wheel 4, it is slidably sleeved on the guide through the L-shaped support vertical frame 11. The outer ring of the rod 10 makes the first rack 7 drive the L-shaped support vertical frame 11 to move continuously. At the same time, the second rack 14 will contact the third gear 29, so as to drive the third gear 29 and the second pulley 30 to rotate simultaneously. When the second pulley 30 rotates, the first pulley 25 can be driven to rotate through the belt 27. The first pulley 25 is connected to the outer ring surface of the collecting chamber 18, so that when the first pulley 25 rotates, it can drive the collecting chamber 18 to rotate, so that the nozzle 20 can rotate above the aluminum alloy wheel 4, so that the surface of the aluminum alloy wheel 4 can be evenly sprayed. At the same time, the positioning sleeve 22 is rotatably sleeved on the support ring 26, so that the collecting chamber 18 can be supported to rotate, and when the collecting chamber 18 rotates, it can also The second gear 23 can be driven to rotate on the inner ring of the gear ring 32, so that the second gear 23 can synchronously drive the stirring blade 19 to rotate. The stirring blade 19 is close to the inner bottom end of the collecting chamber 18, so that the colored essential oil sediment accumulated at the inner bottom end of the collecting chamber 18 can be stirred to avoid excessive deposition of the colored essential oil sediment at the inner bottom end of the collecting chamber 18, thereby improving the spraying uniformity of the colored essential oil. When the second rack 14 moves through the third gear 29, the sprayer 21 can be turned off to stop the nozzle 20 from spraying. Subsequently, the drive motor 2 can be turned on again to drive the first gear 3 to rotate in the opposite direction, so that the two first racks 7 can drive the protective cover 13 to move to the end away from the support platform 34, so that the second rack 14 passes through the third gear 29.When the second rack 14 passes through the third gear 29, the tension of the first spring 9 can drive the L-shaped support vertical frame 11 to reset. Subsequently, when the first rack 7 continues to move, the L-shaped support vertical frame 11 can pull the protective cover 13 out of contact with the aluminum alloy wheel 4, and the bottom end of the L-shaped support vertical frame 11 is slidably sleeved on the extension sleeve frame 8, so that the protective cover 13 can be supported to move in a straight line. When the protective cover 13 is out of contact with the aluminum alloy wheel 4, the hydraulic cylinder 35 can be started to move the protective seat 33 out of the interior of the aluminum alloy wheel 4, so that the aluminum alloy wheel 4 can be easily moved out from the top of the support platform 34 to complete the work. When the device is in use, when the two When the two protective sleeves 13 fit together, they can be located at the top of the outer ring of the aluminum alloy wheel 4, and the center of the side end of the protective sleeve 13 away from the second rack 14 is provided with an arc groove, so that the sprayer 21 can be prevented from interfering with the protective sleeve 13 when rotating, and the two protective sleeves 13 cover the outer ring of the aluminum alloy wheel 4, so that the colored essential oil can be prevented from splashing to the periphery during spraying. At the same time, when the protective sleeve 13 protects the aluminum alloy wheel 4, the second rack 14 can move continuously, so that the third gear 29 and the collection chamber 18 can be driven to rotate at the same time, so that the nozzle 20 can spray the aluminum alloy wheel 4 evenly at the bottom of the two protective sleeves 13.

[0035] Embodiment 2, on the basis of embodiment 1, as Figure 8 As shown, the support platform 34 also includes an extension guide plate 36 and a limiting circular plate 37 . The extension guide plate 36 is fixedly installed at the front end center of the support platform 34 , and the limiting circular plate 37 is fixedly installed at the top rear end of the support platform 34 .

[0036] When implementing this embodiment, when the aluminum alloy wheel 4 needs to be placed on the top of the support platform 34, the aluminum alloy wheel 4 can be placed on the extension guide plate 36, and then the aluminum alloy wheel 4 is pushed toward one end close to the limiting circular plate 37 until the outer ring of the aluminum alloy wheel 4 fits with the inner ring of the limiting circular plate 37, so that the center of the aluminum alloy wheel 4 can be vertically aligned with the center of the support platform 34, so that the protective seat 33 can be accurately inserted into the center of the aluminum alloy wheel 4. Through the provision of the extension guide plate 36, the aluminum alloy wheel 4 can be easily taken out of the support platform 34 or slid to the top center of the support platform 34 to complete the work.

[0037] 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 surface treatment process for aluminum alloy commercial vehicle wheels, characterized in that: The following steps are involved: S1, pre-treatment, pre-treating the aluminum alloy wheel (4) to remove oil stains, oxides and other impurities on the wheel surface; S2, spraying colored essential oil, spraying colored essential oil on the aluminum alloy wheel (4) after pretreatment; S3, baking treatment, baking the aluminum alloy wheel (4) at a high temperature to melt the powder coating and solidify it on the wheel surface; S4, neutral salt spray test, performing passivation and sealing treatment on the aluminum alloy wheel (4), and performing a neutral salt spray test on the aluminum alloy wheel (4) after the treatment to evaluate the corrosion resistance of the aluminum alloy wheel (4); S1 pre-treatment process, including the following steps:

1. Use a high-pressure water gun to perform preliminary cleaning on the surface of the aluminum alloy wheel (4) to remove large particles of impurities and dirt on the surface; 2. Use a sandblasting machine to blast the wheel surface to remove tiny particles and oxides and increase the surface roughness. The blasting medium is corundum sand, the blasting pressure is controlled at 4-7MPar, and the blasting time is 20-30s; 3. Degreasing the aluminum alloy wheel (4) using an alkaline degreasing agent to remove oil stains and grease on the surface of the aluminum alloy wheel (4), wherein the degreasing temperature during the degreasing process is controlled at 50-70° C. and the degreasing time is controlled at 5-15 minutes; 4. After degreasing, the aluminum alloy wheel (4) is pickled, and hydrochloric acid solution is selected as the pickling solution to remove oxides and residues on the surface of the aluminum alloy wheel (4). After pickling, the aluminum alloy wheel (4) is rinsed with clean water to remove acid residues; 5. The surface of the aluminum alloy wheel (4) is activated by an activator, wherein the activator is a mixed solution of fumaric acid and hydrofluoric acid, wherein the solvent of the mixed solution is water, the concentration of fumaric acid is controlled to be 20-30 g / L, and the concentration of hydrofluoric acid is controlled to be 3-5 mL / L.

2. The surface treatment process of an aluminum alloy commercial vehicle wheel according to claim 1, characterized in that: S2 colored essential oil spraying process, including the following steps:

1. Preheat the aluminum alloy wheel (4) before spraying. The preheating temperature is controlled at 115-125°C and the preheating time is controlled at 10-15 minutes; 2. Hang the aluminum alloy wheel (4) on the conveyor line and spray it evenly with a spray gun. During the spraying process, the spray gun distance is controlled at 150-300 mm, the spraying speed is controlled at 0.5-1.5 m / min, and the powder flow rate is controlled at 200-400 g / min; 3. After spraying, send the aluminum alloy wheel (4) to the leveling room to allow the powder coating to flow naturally on the wheel surface; 4. For electrostatic powder, choose epoxy-polyester mixed powder coating, and for electrostatic spray gun, equip the closed powder spray room with a recovery system to recycle the powder while spraying.

3. The surface treatment process of an aluminum alloy commercial vehicle wheel according to claim 1, characterized in that: The S3 baking process includes the following steps:

1. Send the aluminum alloy wheel (4) into a curing furnace for preheating treatment, so that the surface temperature of the wheel gradually rises to the baking temperature, and the preheating temperature is controlled at 100-150°C; 2. After preheating, set the baking temperature and bake the wheels. The baking temperature is controlled at 160-200℃ and the baking time is controlled at 15-30min.

3. After baking, the wheels enter the cooling chamber for natural cooling; 4. After the spraying and baking processes are completed, the aluminum alloy wheel (4) is passivated; 5. Choose chromium-free passivation liquid for aluminum and immerse the wheels in the passivation liquid for 5-10 minutes. After immersion, rinse with clean water and dry.

4. The surface treatment process of an aluminum alloy commercial vehicle wheel according to claim 1, characterized in that: S4 neutral salt spray test, including the following steps:

1. Perform sealing treatment on the aluminum alloy wheel (4): soak the aluminum alloy wheel (4) in the sealing agent for 30-60 seconds, take it out after soaking, and bake it at 120-150°C for 30-35 minutes:

2. Set the salt spray test conditions. Set the test conditions of the salt spray test according to national standards and customer requirements. The test conditions include test temperature, salt spray concentration and relative humidity in the test chamber. Prepare the test chamber and adjust it to the set test conditions; 3. Salt spray test: placing the aluminum alloy wheel (4) that has completed the surface treatment in a salt spray test chamber, starting the salt spray test chamber, and starting a continuous spray test; Regular observation and record: During the test, observe the changes on the wheel surface every 24 hours and record the corrosion degree and time. The corrosion degree shall be assessed by visual inspection or with the aid of a magnifying glass or microscope; Evaluate the test results and keep the test going until the predetermined test time is reached, where the test time is controlled to be 720 hours. After the test, check the wheels. If there is no obvious corrosion on the wheels after 720 hours of salt spray test, the test is considered successful. If corrosion occurs, the test is considered a failure. Record the type, degree and location of corrosion, and prepare a salt spray test report based on the observed and recorded data.

5. A surface treatment device for aluminum alloy wheels of commercial vehicles, the surface treatment process for aluminum alloy wheels of commercial vehicles according to claim 1, characterized in that: S2 A spraying device in a colored essential oil spraying process, comprising a support mechanism (1), an aluminum alloy wheel (4) is slidably placed on the top of the support mechanism (1), a drive motor (2) is fixedly mounted at the rear end of the support mechanism (1), and a first gear (3) is fixedly mounted at the front end of the drive motor (2), characterized in that: the support mechanism (1) comprises a covering device (5) and a positioning component (6), the covering device (5) is fixedly mounted on both sides of the top of the positioning component (6), the covering device (5) comprises a first rack (7), an extension sleeve (8), a first spring (9), a guide rod (10), an L-shaped support vertical frame (11), a connecting frame (12), a protective sleeve (13) and a second rack (14), The connecting frame (12) is fixedly mounted on the rear end of the protective sleeve (13); the guide rod (10) is fixedly mounted on the right side of the connecting frame (12); the L-shaped support frame (11) is slidably sleeved on the outer ring of the guide rod (10); the first spring (9) is fixedly mounted between the connecting frame (12) and the L-shaped support frame (11), and the first spring (9) is located on the outer ring of the guide rod (10); the second rack (14) is fixedly mounted on the top of the side end of the L-shaped support frame (11) close to the guide rod (10); the first rack (7) is fixedly mounted on one end of the L-shaped support frame (11) close to the connecting frame (12); and the extension sleeve (8) is slidably sleeved on the bottom of the outer ring of the L-shaped support frame (11).

6. The surface treatment device for aluminum alloy wheels of commercial vehicles according to claim 5, characterized in that: The positioning component (6) comprises a positioning device (15), a transmission device (16) and a connecting device (17), wherein the transmission device (16) is fixedly mounted on the top rear end of the connecting device (17), and the positioning device (15) is rotatably mounted on the inner front end of the transmission device (16).

7. The surface treatment device for aluminum alloy wheels of commercial vehicles according to claim 6, characterized in that: The alignment device (15) comprises a collecting chamber (18), a stirring blade (19), a nozzle (20), a sprayer (21), a positioning sleeve (22), a second gear (23) and a support frame (24); the sprayer (21) is fixedly mounted at the bottom end of the collecting chamber (18); the nozzle (20) is fixedly mounted at the bottom end of the sprayer (21); the positioning sleeve (22) is fixedly mounted at the bottom of the outer ring of the collecting chamber (18); the support frame (24) is fixedly mounted at the bottom center of the collecting chamber (18); the second gear (23) is rotatably mounted on the outer ring of the support frame (24), and the second gear (23) is distributed in an annular shape; the stirring blade (19) is fixedly mounted at the bottom end of the second gear (23); and the transmission device (16) comprises a first pulley (25), a support ring (26), a belt (27), a support base frame (28), a third gear (29), a second pulley (30), a top frame (31 ) and a gear ring (32), the third gear (29) is rotatably mounted on the top rear end of the support base (28), the support ring (26) is fixedly mounted on the top front end of the support base (28), the second pulley (30) is fixedly mounted on the top of the third gear (29), the belt (27) is sleeved on the outer ring of the second pulley (30), the first pulley (25) is rotatably mounted inside the end of the belt (27) away from the second pulley (30), the top frame (31) is fixedly mounted on the top of the support base (28) close to the support ring (26), the gear ring (32) is fixedly mounted on the front end of the top frame (31) close to the first pulley (25), and the connecting device (17) comprises a protective seat (33), a support platform (34) and a hydraulic cylinder (35), the hydraulic cylinder (35) is fixedly mounted on the bottom end of the support platform (34), and the protective seat (33) is fixedly mounted on the top of the hydraulic cylinder (35).

8. The surface treatment device for aluminum alloy wheels of commercial vehicles according to claim 7, characterized in that: The extension sleeve (8) is fixedly mounted on both sides of the top of the support platform (34), the support base (28) is fixedly mounted on the top rear end of the support platform (34), the top of the outer ring of the collection chamber (18) is fixedly mounted on the inner ring of the first pulley (25), the second gear (23) is meshed with the gear ring (32), and the first rack (7) is meshed with the first gear (3).

9. The surface treatment device for aluminum alloy wheels of commercial vehicles according to claim 8, characterized in that: The second rack (14) is flush with the third gear (29), the positioning sleeve (22) is rotatably sleeved on the support ring (26), the outer ring of the protective seat (33) is in contact with the inner ring of the aluminum alloy wheel (4), a circular arc groove is provided at the center of the side end of the protective sleeve (13) away from the second rack (14), a pipeline is installed between the sprayer (21) and the collection chamber (18), and the length of the nozzle (20) is equal to the diameter of the aluminum alloy wheel (4).

10. The surface treatment device for aluminum alloy wheels of commercial vehicles according to claim 9, characterized in that: The support platform (34) further comprises an extension guide plate (36) and a limiting circular plate (37), wherein the extension guide plate (36) is fixedly mounted at the front end center of the support platform (34), and the limiting circular plate (37) is fixedly mounted at the top rear end of the support platform (34).

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