Energy-saving hub coating production line capable of carrying out paint flash-drying by utilizing waste heat of curing oven

Abstract

The invention belongs to the field of hub spraying, and particularly relates to an energy-saving hub coating production line which utilizes waste heat of a curing oven to carry out paint flash-drying, the energy-saving hub coating production line comprises a pretreatment line, a dehydration drying oven and a workpiece treatment line, and the output end of the pretreatment line is connected with the dehydration drying oven through a ground rail conveying belt. According to the energy-saving hub coating production line capable of carrying out paint flash-drying by utilizing the waste heat of the curing ovens, a first curing oven, a second curing oven, a third curing oven and a ground rail conveying belt connected among a colored paint spraying chamber, a primer spraying chamber and a transparent paint spraying chamber in a first paint spraying chamber pass through the outer side of the first curing oven; therefore, the processing waste heat of the first curing oven is used for carrying out surface paint flash-drying on the hub which is just sprayed in the colored paint spraying chamber, the primer spraying chamber and the transparent paint spraying chamber from the first paint spraying chamber. And a ground rail conveying belt connected between the second paint spraying chamber and the third curing oven passes through the outer side of the third curing oven, so that the processing waste heat of the third curing oven is used for carrying out surface paint flash-drying on the hub which is just sprayed in the second paint spraying chamber.

Description

Technical Field

[0001] This invention relates to the field of wheel hub painting technology, specifically to an energy-saving wheel hub painting production line that utilizes waste heat from a curing oven for paint flash-drying. Background Technology

[0002] As a crucial component of automobiles, the quality of the surface coating of wheel hubs directly impacts the product's appearance, corrosion resistance, and market value. With the automotive industry's ever-increasing demands for wheel hub appearance quality, surface treatment coating processes are receiving increasing attention.

[0003] Existing energy-saving wheel coating production lines that utilize waste heat from curing ovens for paint flash-drying typically include basic processes such as pretreatment, coating, and curing. However, traditional production lines have the following problems:

[0004] First, the existing production lines are not rationally divided into process sections. Paint coating and powder coating often use separate production lines, resulting in large redundant investments in equipment, large floor space requirements, and poor production flexibility. When switching between different coating processes, the production line configuration needs to be readjusted, leading to high product changeover costs and low production efficiency.

[0005] Secondly, the energy efficiency of existing production lines is low. A large amount of waste heat generated by heating equipment such as curing ovens is directly emitted without effective recovery and utilization, resulting in energy waste and increased production costs. At the same time, there is a lack of overall planning for heat utilization between different process stages; processes such as preheating and flash drying still require additional heating equipment.

[0006] Secondly, the existing production lines have a low level of automation, especially in the transfer of workpieces between different process sections, which mostly relies on manual handling or simple conveyor belt transport, lacking flexible transfer mechanisms. This not only increases labor costs but also easily causes surface damage to workpieces during the transfer process, affecting product quality.

[0007] Furthermore, the existing quality control methods on the production line are relatively outdated. The detection of coating defects mainly relies on manual visual inspection, which is inefficient, inaccurate, and lacks the ability to automatically collect and analyze defect data. Defective workpieces are often only discovered after they have flowed into subsequent processes, resulting in a waste of materials and time.

[0008] In addition, the existing production line's grinding mechanism has a single function, usually only able to grind a specific part of the wheel hub, and cannot be compatible with wheel hub products of various sizes. When product specifications change, it is necessary to change the grinding fixture or adjust the equipment parameters, which takes a long time to debug and affects the continuity of production.

[0009] Finally, existing production lines are not convenient enough for reworking defective products. When paint defects are found that require touch-up painting or repainting, there is a lack of specialized fixtures and equipment, making it inconvenient for workers to operate, resulting in low rework efficiency and difficulty in ensuring consistent product quality after rework.

[0010] In summary, existing energy-saving wheel coating production lines that utilize waste heat from curing ovens for paint flash-drying suffer from several technical problems, including poor process integration, low energy efficiency, low automation, inadequate quality control, poor product adaptability, and inconvenience in reworking defective products. There is an urgent need for a highly efficient, energy-saving, and stable energy-saving wheel coating production line that utilizes waste heat from curing ovens for paint flash-drying to address these issues. Therefore, we propose an energy-saving wheel coating production line that utilizes waste heat from curing ovens for paint flash-drying. Summary of the Invention

[0011] The main objective of this invention is to provide an energy-saving wheel hub coating production line that utilizes waste heat from a curing oven for paint flash-drying, thereby solving the problems mentioned in the background section.

[0012] To achieve the above objectives, the present invention proposes an energy-saving wheel hub coating production line that utilizes waste heat from a curing oven for flash drying of paint, comprising a pretreatment line, a dehydration and drying oven, and a workpiece processing line. The output end of the pretreatment line is connected to the dehydration and drying oven via a ground rail conveyor belt, and the dehydration and drying oven is connected to the input end of the workpiece processing line via a ground rail conveyor belt.

[0013] The workpiece processing line includes a first process section and a second process section connected in series.

[0014] The first process section includes a first grinding chamber, a first painting chamber, a clear varnish spraying chamber, a paint surface drying oven, a first curing oven, and a first forced cooling belt. The components are connected and transported sequentially by a ground rail conveyor belt.

[0015] The second process section includes a second grinding chamber, a powder spraying chamber, a powder cleaning chamber, a second curing oven, a second forced cooling belt, a third grinding chamber, a second painting chamber, a third curing oven, and a third forced cooling belt. The components are connected and transported sequentially by a ground rail conveyor belt.

[0016] The second grinding chamber is connected to the first forced cooling belt via a robotic arm, and is used to receive workpieces from the first process section and transport them to the second process section.

[0017] The ground-rail conveyor belt connecting the color paint spraying chamber and the primer spraying chamber and the clear coat spraying chamber in the first spraying chamber passes through the outside of the first curing oven;

[0018] The ground-rail conveyor belt connecting the second spray booth and the third curing oven passes through the outside of the third curing oven;

[0019] The tail section of the first forced cooling belt is equipped with a visual quality control monitoring device;

[0020] The ground-rail conveyor belt between the third grinding chamber and the second spray painting chamber is located inside the electrostatic dust removal section.

[0021] Preferably, the ground rail conveyor belt includes a track, a drive motor, and a carrying fixture, the carrying fixture reciprocating along the track to transport the workpiece;

[0022] The robotic arm is a multi-degree-of-freedom industrial robot, and its gripping end is equipped with a clamp that adapts to the shape of the workpiece.

[0023] The first curing oven, the second curing oven, and the third curing oven are infrared curing ovens;

[0024] The first forced cooling belt, the second forced cooling belt, and the third forced cooling belt are equipped with air-cooling devices;

[0025] The input end of the first grinding chamber is connected to the dehydration and drying oven, and the output end of the first forced cooling belt is connected to the second grinding chamber via a robotic arm.

[0026] Preferably, the pretreatment line includes a hot water washing station, a pre-degreasing station, an inlet spray degreasing station, a degreasing soaking station, an outlet spray degreasing station, a counter-current water washing station, a surface conditioning station, a counter-current pure water washing station, and a chromium-free passivation station.

[0027] The first spray booth is used for spraying color paint and primer, and the clear coat spray booth is used for spraying varnish;

[0028] The powder spraying chamber is used for spraying powder coatings, and the powder cleaning chamber is used for removing excess powder from the surface of the workpiece.

[0029] The third forced cooling zone is the final output end of the workpiece processing line.

[0030] Preferably, the last section of the first process segment of the workpiece processing line is provided with a manual spray painting repair and red-painting work segment.

[0031] Preferably, the manual spray painting repair and repainting section is equipped with a wheel hub clamp, the wheel hub clamp comprising:

[0032] The counterweight base has its upper surface hinged to one end of a tilting hydraulic rod, and the other end of the tilting hydraulic rod hinged to the bottom surface of the clamp body. A pneumatic clamping rod is rotatably connected to the inner wall of the clamp body, and a rotating handle is fixedly connected to the surface of the pneumatic clamping rod.

[0033] Preferably, the first grinding chamber, the second grinding chamber, and the third grinding chamber are all equipped with a hub grinding mechanism, the hub grinding mechanism comprising:

[0034] Mounting bracket, wherein an electric motor is fixedly connected to the upper surface of the mounting bracket, and the output end of the electric motor passes through the upper surface of the mounting bracket and is fixedly connected to the end face of the upper fixed clamping rod;

[0035] The lower fixed clamp rod has its end face fixedly connected to the inner wall of the mounting frame. The surface of the mounting frame is provided with a lead screw slide, and a grinding roller is rotatably connected to the surface of the moving block of the lead screw slide.

[0036] Rubber sealing strip, the rubber sealing strip is disposed on the surface of the lead screw slide;

[0037] The end face of the upper fixed clamping rod is fixedly connected to a fixed head, and the end face of the lower fixed clamping rod is rotatably connected to a fixed head.

[0038] This invention provides an energy-saving wheel hub coating production line that utilizes waste heat from a curing oven for paint flash-drying. It offers the following advantages:

[0039] (1) This energy-saving wheel coating production line utilizes the waste heat of the curing oven for paint flash-drying. Through the first, second, and third curing ovens, a ground-rail conveyor belt connecting the color paint spraying chamber and the primer spraying chamber in the first spray booth passes outside the first curing oven, thereby utilizing the processing waste heat of the first curing oven to flash-dry the surface paint on the wheel hubs freshly sprayed from the color paint spraying chamber, primer spraying chamber, and clear paint spraying chamber in the first spray booth. Similarly, a ground-rail conveyor belt connecting the second spray booth and the third curing oven passes outside the third curing oven, thereby utilizing the processing waste heat of the third curing oven to flash-dry the surface paint on the wheel hubs freshly sprayed from the second spray booth. A visual quality control monitoring device is installed at the end of the first forced cooling zone to perform full-surface imaging inspection of the workpieces after the first process stage has been cooled. It can automatically identify painting defects such as paint drips, exposed substrate, paint residue, and color differences, simultaneously marking the defect coordinates and transmitting them to downstream manual workstations. It also enables initial quality control screening, preventing defective workpieces from flowing into subsequent processes and causing cost waste. Furthermore, it can statistically analyze defect types and distribution data, providing data support for iterative optimization of the front-end painting process. The ground-rail conveyor belt between the third grinding chamber and the second painting chamber is located inside the electrostatic dust removal section. This allows the processed wheel hubs placed on the conveyor belt to have residual waste removed by electrostatic dust removal as they pass through the section, improving the yield rate of subsequent processes.

[0040] (2) This energy-saving wheel hub coating production line utilizes waste heat from the curing oven for paint flash drying. Through a wheel hub grinding mechanism, a robotic arm removes the wheel hub from the ground conveyor belt and places it on the fixed head of the lower fixed clamp. Simultaneously, the upper and lower fixed clamps are activated to clamp the wheel hub. The motor then starts, driving the upper fixed clamp to rotate. Through the friction between the fixed head and the wheel hub, the wheel hub rotates as a whole. The lead screw slide then starts, moving the grinding rollers to grind the wheel hub surface. When grinding the wheel hub end face is required, the extension and retraction distances of the upper and lower fixed clamps are controlled, allowing the lead screw slide to move the grinding rollers to the top or bottom surface of the wheel hub. Furthermore, by controlling the extension and retraction distances of the upper and lower fixed clamps and the movement positions of each grinding roller, the line can accommodate various wheel hub sizes, resulting in lower product changeover costs. Simultaneous grinding by multiple grinding rollers significantly increases the grinding speed of the device.

[0041] (3) This energy-saving wheel hub coating production line utilizes waste heat from the curing oven for paint flash-drying. Through the wheel hub clamps, when it is necessary to touch up or inspect defective products, the defective wheel hub is removed from the ground conveyor belt. The tilting hydraulic rod is activated, causing it to tilt the clamp body. At this time, the pneumatic clamping rod is in a longitudinal position, and the wheel hub is placed on the clamping head of the pneumatic clamping rod. The pneumatic clamping rod is then activated to clamp the wheel hub. The tilting hydraulic rod is then activated again to pull the clamp body back to a horizontal position, thus placing the clamped wheel hub in an upright position. This allows workers to easily inspect and recoat the wheel hub for painting defects. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the overall planar structure of the present invention;

[0044] Figure 2 This is an enlarged structural diagram of the present invention (A).

[0045] Figure 3 This is a schematic diagram of the wheel hub grinding mechanism of the present invention;

[0046] Figure 4 This is a schematic diagram of the posture and structure of the hub clamp of the present invention;

[0047] Figure 5This is a schematic diagram of the second posture structure of the hub clamp of the present invention.

[0048] Reference numerals: 110, Pre-treatment line; 120, Dehydration and drying oven; 210, First grinding chamber; 220, First painting chamber; 230, Clear coat spraying chamber; 240, Paint surface drying oven; 250, First curing oven; 260, First forced cooling zone; 270, Manual painting repair and inking section; 271, Wheel hub clamp; 2711, Counterweight base; 2712, Tilting hydraulic rod; 2713, Clamp body; 2714, Rotating handle; 2715, Pneumatic clamp. 310. Tightening rod; 320. Second grinding chamber; 330. Powder spraying chamber; 340. Cleaning chamber; 350. Second forced cooling belt; 360. Third grinding chamber; 370. Second painting chamber; 380. Third curing oven; 390. Third forced cooling belt; 401. Mounting frame; 402. Motor; 403. Upper fixing clamp; 404. Lower fixing clamp; 405. Grinding roller; 406. Screw slide; 407. Rubber sealing strip; 408. Fixing head.

[0049] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Please see Figures 1-5 This invention proposes an energy-saving wheel hub coating production line that utilizes waste heat from a curing oven for flash drying of paint, including a pretreatment line 110, a dehydration and drying oven 120, and a workpiece processing line. The output end of the pretreatment line 110 is connected to the dehydration and drying oven 120 via a ground rail conveyor belt, and the dehydration and drying oven 120 is connected to the input end of the workpiece processing line via a ground rail conveyor belt.

[0052] The workpiece processing line consists of a first process section and a second process section connected in series.

[0053] The first process section includes a first grinding chamber 210, a first painting chamber 220, a clear varnish spraying chamber 230, a paint surface drying oven 240, a first curing oven 250, and a first forced cooling belt 260. The components are connected and transported sequentially by ground rail conveyor belts.

[0054] The second process section includes a second grinding chamber 310, a powder spraying chamber 320, a powder cleaning chamber 330, a second curing oven 340, a second forced cooling belt 350, a third grinding chamber 360, a second painting chamber 370, a third curing oven 380, and a third forced cooling belt 390. The components are connected and transported sequentially by a ground rail conveyor belt.

[0055] The second grinding chamber 310 is connected to the first forced cooling belt 260 via a robotic arm, and is used to receive workpieces from the first process section and transport them to the second process section.

[0056] Specifically, the ground-rail conveyor belt connecting the color paint spraying chamber and primer spraying chamber and the clear coat spraying chamber 230 in the first spraying chamber 220 passes through the outside of the first curing oven 250.

[0057] The ground-rail conveyor belt connecting the second spray booth 370 and the third curing oven 380 passes through the outside of the third curing oven 380.

[0058] The ground-rail conveyor belt between the third grinding chamber 360 and the second spray painting chamber 370 is located inside the electrostatic dust removal section.

[0059] Specifically, the ground rail conveyor belt includes a track, a drive motor, and a load-bearing fixture, which moves back and forth along the track to transport the workpiece.

[0060] The robotic arm is a multi-degree-of-freedom industrial robot, and its gripping end is equipped with a clamp that adapts to the shape of the workpiece;

[0061] The first curing oven 250, the second curing oven 340 and the third curing oven 380 are infrared curing ovens;

[0062] The first forced cooling zone 260, the second forced cooling zone 350 and the third forced cooling zone 390 are equipped with air-cooling devices;

[0063] The input end of the first grinding chamber 210 is connected to the dehydration and drying oven 120, and the output end of the first forced cooling belt 260 is connected to the second grinding chamber 310 via a mechanical arm.

[0064] Specifically, the pretreatment line 110 includes a hot water washing station, a pre-degreasing station, an inlet spray degreasing station, a degreasing soaking station, an outlet spray degreasing station, a counter-current water washing station, a surface conditioning station, a counter-current pure water washing station, and a chromium-free passivation station.

[0065] The first spray booth 220 is used for spraying color paint and primer, and the clear coat spray booth 230 is used for spraying varnish;

[0066] The powder spraying chamber 320 is used for spraying powder coatings, and the powder cleaning chamber 330 is used for removing excess powder from the surface of the workpiece;

[0067] The third forced cooling zone 390 is the final output end of the workpiece processing line.

[0068] Specifically, the last section of the first process segment of the workpiece processing line is equipped with a manual spray painting repair and repainting section 270.

[0069] Specifically, the manual spray painting repair and repainting section 270 is equipped with a wheel hub clamp 271, which includes:

[0070] The counterweight base 2711 has its upper surface hinged to one end of the tilting hydraulic rod 2712, and the other end of the tilting hydraulic rod 2712 is hinged to the bottom surface of the clamp body 2713. The inner wall of the clamp body 2713 is rotatably connected to a pneumatic clamping rod 2715, and a rotating handle 2714 is fixedly connected to the surface of the pneumatic clamping rod 2715.

[0071] Specifically, the first grinding chamber 210, the second grinding chamber 310, and the third grinding chamber 360 are all equipped with a hub grinding mechanism, which includes:

[0072] Mounting bracket 401, with motor 402 fixedly connected to the upper surface of mounting bracket 401. The output end of motor 402 passes through the upper surface of mounting bracket 401 and is fixedly connected to the end face of upper fixed clamping rod 403.

[0073] The lower fixed clamping rod 404 is fixedly connected to the inner wall of the mounting frame 401. The surface of the mounting frame 401 is provided with a lead screw slide 406, and a grinding roller 405 is rotatably connected to the moving block surface of the lead screw slide 406.

[0074] Rubber sealing strip 407 is provided on the surface of screw slide 406;

[0075] The end face of the upper fixed clamping rod 403 is fixedly connected to the fixed head 408, and the end face of the lower fixed clamping rod 404 is rotatably connected to the fixed head 408.

[0076] The present invention provides an energy-saving wheel coating production line that utilizes waste heat from a curing oven for paint flash-drying, comprising a pretreatment line 110, a dehydration and drying oven 120, and a workpiece processing line. The workpiece processing line includes a first process section and a second process section connected in series, with each component connected and conveyed sequentially via a ground-rail conveyor belt.

[0077] Pre-treatment and transfer stage: The workpiece is first manually loaded onto the pre-treatment line 110, and then sequentially passes through the hot water washing station, pre-degreasing station, in-tank spray degreasing station, degreasing immersion station, and out-of-tank spray degreasing station for degreasing treatment. Subsequently, it undergoes counter-current water washing, surface conditioning, counter-current pure water washing, and chromium-free passivation to complete surface pretreatment. After automatic and manual dehydration, the treated workpiece enters the dehydration and drying oven 120 for drying and dehydration. After completion, it is conveyed to the workpiece processing line via a ground-rail conveyor belt.

[0078] The first process stage, painting stage: After the workpiece is output from the dehydration and drying oven 120, it first enters the first grinding chamber 210 for surface grinding, and then is conveyed by a ground conveyor belt to the first spray painting chamber 220 for primer and color paint spraying. After spraying, the workpiece undergoes surface flash drying treatment in the paint surface drying oven 240, and the surface paint of the freshly sprayed wheel hub is flash dried using the processing waste heat of the first curing oven 250. Subsequently, the workpiece enters the clear varnish spraying chamber 230 for clear varnish spraying, and then enters the first curing oven 250 for drying and curing. After completion, it is forcibly cooled by the first forced cooling belt 260. The end of the first forced cooling belt 260 is equipped with a visual quality control monitoring device to perform full-surface imaging inspection of the cooled workpiece, automatically identify spraying defects, mark the defect coordinates, and transmit them to the downstream manual station. The final stage of the first process stage is equipped with a manual painting repair and repainting section 270, equipped with wheel hub clamps 271, for touch-up painting and inspection repainting of defective products.

[0079] Process transition stage: After the first process stage is completed, the second grinding chamber 310 is connected to the first forced cooling belt 260 via a robotic arm. The gripping end of the multi-degree-of-freedom industrial robot is equipped with a fixture adapted to the shape of the workpiece, which grips the workpiece from the first forced cooling belt 260 and transports it to the second grinding chamber 310, realizing the automatic transition between the first and second process stages.

[0080] The second process stage, powder coating: After entering the second grinding chamber 310, the workpiece passes through the powder spraying chamber 320 for powder coating. The powder cleaning chamber 330 removes excess powder from the workpiece surface. It then enters the second curing oven 340 for drying and curing, followed by forced cooling via the second forced cooling belt 350. The workpiece then enters the third grinding chamber 360 for secondary grinding. The ground-rail conveyor between the third grinding chamber 360 and the second painting chamber 370 is located inside the electrostatic dust removal section, ensuring that any residual waste on the workpiece surface is cleaned by electrostatic dust removal. After painting in the second painting chamber 370, the ground-rail conveyor connecting the second painting chamber 370 and the third curing oven 380 passes outside the third curing oven 380, utilizing the waste heat from the third curing oven 380 to flash-dry the freshly painted wheel hub. The workpiece then enters the third curing oven 380 for final drying and curing, and is finally unloaded after forced cooling via the third forced cooling belt 390, which is the final output end of the workpiece processing line.

[0081] The ground-rail conveyor belt connecting the color paint spraying chamber and primer spraying chamber and the clear coat spraying chamber 230 in the first paint spraying chamber 220 passes through the outside of the first curing oven 250, and uses the waste heat from the first curing oven 250 to flash-dry the surface paint on the freshly sprayed wheel hub. The ground-rail conveyor belt connecting the second spray booth 370 and the third curing oven 380 passes outside the third curing oven 380, using the waste heat from the third curing oven 380 to flash-dry the surface paint on the freshly sprayed wheel hubs, achieving energy recycling (the path length of the ground-rail conveyor belt around the outside of the curing oven is 8-12 meters, 10±1 meters for the first curing oven and 9±1 meters for the third curing oven, ensuring that the wheel hub stays in the flash-drying area for 3-5 minutes; the curing oven is an infrared oven, using its heat dissipation system's heat dissipation grid to guide high-temperature waste gas of 150-200℃, which, after heat exchange, forms an effective heating temperature of 80-120℃ in the flash-drying area, with a heat exchange efficiency of 70-80%; energy consumption comparison data shows that compared with traditional independent infrared flash-drying equipment, this solution saves approximately 180,000 kWh of electricity per production line per year, and reduces overall energy consumption by 30-40%).

[0082] The ground-rail conveyor belt includes a track, a drive motor, and a carrying fixture. The carrying fixture moves back and forth along the track to transport the workpiece. The input end of the first grinding chamber 210 is connected to the dehydration and drying oven 120, and the output end of the first forced cooling belt 260 is connected to the second grinding chamber 310 via a robotic arm. The ground-rail conveyor belt enables continuous transport of workpieces between each process section.

[0083] The first grinding chamber 210, the second grinding chamber 310, and the third grinding chamber 360 are all equipped with wheel hub grinding mechanisms. A robotic arm removes the wheel hub from the ground-mounted conveyor belt and places it on the fixed head 408 of the lower fixed clamping rod 404. The upper and lower fixed clamping rods 403 and 404 are then activated to clamp the wheel hub. The motor 402 drives the upper fixed clamping rod 403 to rotate, and the friction between the fixed head 408 and the wheel hub causes the entire wheel hub to rotate. The lead screw slide 406 drives the grinding roller 405 to move, grinding the surface of the wheel hub. By controlling the extension and retraction distances of the upper and lower fixed clamping rods 403 and 404, various wheel hub sizes can be accommodated, and the end faces of the wheel hubs can be ground.

[0084] The wheel hub clamp 271 set in the manual spray painting repair and repainting work section 270 includes a counterweight base 2711, a tilting hydraulic rod 2712, a clamp body 2713, a rotating handle 2714, and a pneumatic clamping rod 2715. When it is necessary to touch up the paint on defective products and inspect and repaint them, the tilting hydraulic rod 2712 is activated to push the clamp body 2713 to tilt, placing the wheel hub on the clamping head of the pneumatic clamping rod 2715 and clamping it. The tilting hydraulic rod 2712 is activated again to pull the clamp body 2713 back to the horizontal position, so that the clamped wheel hub is in an upright position, which makes it easier for workers to inspect and repaint the wheel hub for spray painting defects.

[0085] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An energy-saving wheel hub coating production line that utilizes waste heat from a curing oven for paint flash-drying, comprising a pretreatment line (110), a dehydration and drying oven (120), and a workpiece processing line, characterized in that: The output end of the pretreatment line (110) is connected to the dehydration and drying oven (120) via a ground rail conveyor belt, and the dehydration and drying oven (120) is connected to the input end of the workpiece processing line via a ground rail conveyor belt. The workpiece processing line includes a first process section and a second process section connected in series. The first process section includes a first grinding chamber (210), a first painting chamber (220), a clear varnish spraying chamber (230), a paint surface drying oven (240), a first curing oven (250), and a first forced cooling belt (260). The components are connected and transported sequentially by a ground rail conveyor belt. The second process section includes a second grinding chamber (310), a powder spraying chamber (320), a powder cleaning chamber (330), a second curing oven (340), a second forced cooling belt (350), a third grinding chamber (360), a second painting chamber (370), a third curing oven (380), and a third forced cooling belt (390). The components are sequentially transported and connected by a ground rail conveyor belt. The second grinding chamber (310) is connected to the first forced cooling belt (260) via a robotic arm, and is used to receive workpieces from the first process section and transport them to the second process section. The ground rail conveyor belt connecting the paint spraying chamber and primer spraying chamber and the clear coat spraying chamber (230) in the first paint spraying chamber (220) passes through the outside of the first curing oven (250) and uses the processing waste heat of the first curing oven (250) to flash dry the surface paint of the freshly sprayed wheel hub. The ground rail conveyor belt connecting the second spray booth (370) and the third curing oven (380) passes through the outside of the third curing oven (380) and uses the processing waste heat of the third curing oven (380) to flash dry the surface paint on the freshly sprayed wheel hub. The ground-rail conveyor belt between the third grinding chamber (360) and the second spray painting chamber (370) is located inside the electrostatic dust removal section; The tail section of the first forced cooling belt (260) is equipped with a visual quality control monitoring device.

2. The energy-saving wheel hub coating production line using waste heat from a curing oven for paint flash-off as described in claim 1, characterized in that: The ground rail conveyor belt includes a track, a drive motor, and a load-bearing fixture, which reciprocates along the track to transport the workpiece. The robotic arm is a multi-degree-of-freedom industrial robot, and its gripping end is equipped with a clamp that adapts to the shape of the workpiece. The first curing oven (250), the second curing oven (340), and the third curing oven (380) are infrared curing ovens; The first forced cooling belt (260), the second forced cooling belt (350) and the third forced cooling belt (390) are equipped with air-cooling devices; The input end of the first grinding chamber (210) is connected to the dehydration and drying oven (120), and the output end of the first forced cooling belt (260) is connected to the second grinding chamber (310) via a mechanical arm.

3. The energy-saving wheel hub coating production line according to claim 1, which utilizes waste heat from a curing oven for paint flash-off drying, is characterized in that: The pretreatment line (110) includes a hot water washing station, a pre-degreasing station, an inlet spray degreasing station, a degreasing soaking station, an outlet spray degreasing station, a counter-current water washing station, a surface conditioning station, a counter-current pure water washing station, and a chromium-free passivation station. The first spray booth (220) is used for spraying color paint and primer, and the clear coat spray booth (230) is used for spraying varnish; The powder spraying chamber (320) is used for spraying powder coatings, and the powder removal chamber (330) is used for removing excess powder from the surface of the workpiece; The third forced cooling zone (390) is the final output end of the workpiece processing line.

4. The energy-saving wheel hub coating production line according to claim 1, which utilizes waste heat from a curing oven for paint flash-drying, is characterized in that: The final section of the first process segment of the workpiece processing line is equipped with a manual spray painting repair and repainting section (270).

5. The energy-saving wheel hub coating production line according to claim 4, which utilizes waste heat from a curing oven for paint flash-off drying, is characterized in that: The manual spray painting repair and repainting section (270) is equipped with a wheel hub clamp (271), which includes: The counterweight base (2711) has its upper surface hinged to one end of the flipping hydraulic rod (2712), and the other end of the flipping hydraulic rod (2712) is hinged to the bottom surface of the clamp body (2713). The inner wall of the clamp body (2713) is rotatably connected to a pneumatic clamping rod (2715), and a rotating handle (2714) is fixedly connected to the surface of the pneumatic clamping rod (2715).

6. The energy-saving wheel hub coating production line according to claim 1, which utilizes waste heat from a curing oven for paint flash-off drying, is characterized in that: The first grinding chamber (210), the second grinding chamber (310), and the third grinding chamber (360) are all equipped with a hub grinding mechanism, which includes: Mounting bracket (401), the upper surface of which is fixedly connected to a motor (402), the output end of which passes through the upper surface of the mounting bracket (401) and is fixedly connected to the end face of the upper fixed clamping rod (403); The lower fixed clamp rod (404) is fixedly connected to the inner wall of the mounting frame (401) at its end face. The mounting frame (401) is provided with a lead screw slide (406) and a grinding roller (405) is rotatably connected to the moving block surface of the lead screw slide (406). A rubber sealing strip (407) is disposed on the surface of the lead screw slide (406); The end face of the upper fixed clamping rod (403) is fixedly connected to a fixing head (408), and the end face of the lower fixed clamping rod (404) is rotatably connected to a fixing head (408).

Images