An automated dip coating production line and its manufacturing process

Abstract

This invention relates to an automated dip coating production line, comprising: a conveyor frame with sequentially arranged loading, preheating, dip coating, curing, cooling, and unloading stations; multiple hooks for hooking workpieces on the conveyor frame, the hooks passing sequentially through the loading, preheating, dip coating, curing, cooling, and unloading stations; two heating mechanisms, one each located at the preheating and curing stations; a dip coating mechanism located below the dip coating stations; and a cooling mechanism located below the cooling stations. The advantages of this invention are: only one person is needed for loading and unloading operations, eliminating the need for manual intervention at other locations, effectively improving the level of automation and enhancing the quality and efficiency of dip coating.

Description

Technical Field

[0001] This invention relates to the field of dip coating production technology, and in particular to an automatic dip coating production line and its production process. Background Technology

[0002] Dip coating, also known as plastic coating, hot-dip coating, or hot-applied plastic coating, is a plastic coating process. Depending on the raw materials used, dip coating can be divided into liquid dip coating and powder dip coating. Dip-coated products are widely used in various aspects of production and daily life both domestically and internationally, such as clothes hangers, pliers, scissors sleeves, and water valve wrenches. In the electrical field, many metal workpieces also require dip coating to ensure insulation.

[0003] Liquid dip coating mostly uses hot-dip coating liquid. Thermoplastic coatings have the property of softening when heated and solidifying into a film when cooled. However, existing dip coating equipment on the market has the following disadvantages: low dip coating efficiency: due to the low degree of automation of existing dip coating equipment, multiple workers are required to assist in the operation, resulting in low dip coating efficiency. In addition, due to the large amount of human intervention, the product quality is inconsistent. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an automatic dip coating production line and its production process to solve the above problems.

[0005] The technical solution of this invention is implemented as follows: an automatic dip coating production line, comprising,

[0006] The conveyor frame is provided with a loading station, a preheating station, a dip-coating station, a curing station, a cooling station and a unloading station in sequence. The conveyor frame is provided with multiple hooks for hooking workpieces. The hooks pass through the loading station, preheating station, dip-coating station, curing station, cooling station and unloading station in sequence.

[0007] The heating mechanism comprises two heating mechanisms, which are respectively located at the preheating station and the curing station;

[0008] A dip coating mechanism is located below the dip coating station;

[0009] A cooling mechanism is located below the cooling station.

[0010] By adopting the above technical solution, the workpiece is hung on the rack at the loading station, and then moves with the conveyor to the heating mechanism at the preheating station to preheat the workpiece. Then it goes to the dip coating station to dip the workpiece in plastic, then to the heating mechanism at the curing station to heat and cure the dip-coated workpiece, then to the cooling station to cool the cured workpiece, and finally to the unloading station to remove the processed workpiece, and then to the loading station to hang a new workpiece to be dipped in plastic, and the cycle repeats. Only one person is needed to perform the loading and unloading operations, and no other personnel are needed, which effectively improves the degree of automation and the quality and efficiency of dip coating.

[0011] The present invention is further configured such that: the dip coating mechanism includes a dip coating body, a scraping mechanism for scraping the surface of the dip coating liquid in the dip coating body, and a filtration system for filtering the dip coating liquid discharged from the dip coating body; the dip coating body includes:

[0012] A solution tank, the upper side of which is open, the solution tank stores a flowing medium, and the bottom of the solution tank has a discharge port connected to a discharge pipe;

[0013] A base, on which a lifting mechanism is provided, the lifting mechanism being connected to the bottom of the solution tank for moving the solution tank vertically relative to the base;

[0014] A limiting seat, wherein several limiting seats are provided and mounted on a base;

[0015] A limiting rod is slidably connected to a limiting seat, and the limiting rod is fixedly connected to the bottom of the solution tank, with the limiting rod passing through the base.

[0016] By adopting the above technical solution, when the workpiece moves above the dip coating mechanism, the lifting mechanism on the base drives the solution tank to rise, immersing the workpiece in the dip coating liquid. After the dip coating is completed, the lifting mechanism drives the solution tank to fall. By moving the solution tank up and down while the workpiece remains stationary, the stability of the workpiece during dip coating can be effectively improved, making it less prone to shaking and effectively improving the quality of dip coating. Through the cooperation of the limit seat and the limit rod, the lifting of the solution tank can be made more stable and less prone to shaking.

[0017] The present invention is further configured such that the scraping mechanism includes:

[0018] A waste trough surrounds the outside of the open edge of the solution tank. The bottom of the waste trough is at a lower level than the open edge of the solution tank. A discharge port connected to a discharge pipe is provided at the bottom of the waste trough.

[0019] The scraper is arranged in an inverted "L" shape. The scraper includes an upper mounting plate and a lower scraper. The upper mounting plate is arranged horizontally, and the lower scraper is arranged vertically perpendicular to the upper mounting plate.

[0020] The bracket has a drive mechanism connected to both ends. The drive mechanism includes a slider, a lead screw threaded to the slider, and a motor that drives the lead screw to rotate. The bracket is fixedly connected to the slider. The drive mechanism is located on the edge of the waste tank opening and the bracket is located above the solution tank.

[0021] The scraper is positioned below the support via a height adjustment mechanism, with the lower side of the scraper being below the horizontal level of the solution tank opening.

[0022] By adopting the above technical solution, the lower side of the scraper is immersed in the dip coating liquid. After the workpiece is dipped, the motor drives the lead screw to rotate, thereby moving the slider. The slider drives the bracket and scraper to move at the opening of the solution tank, thereby scraping off the surface of the dip coating liquid. This effectively cleans up the impurities floating on the surface of the dip coating liquid. The scraped-off dip coating liquid and impurities flow into the waste tank for collection and are discharged from the discharge port and discharge pipe.

[0023] The present invention is further configured such that the height adjustment mechanism includes:

[0024] An adjusting nut is fixedly installed in the middle of the bracket;

[0025] An adjusting screw is threadedly connected to an adjusting nut. The lower end of the adjusting screw is rotatably connected to the middle of the upper hanging plate. The adjusting screw does not move relative to the upper hanging plate. A rotating handwheel is provided at the upper end of the adjusting screw.

[0026] A guide rod is vertically fixed to the upper hanging plate and passes through the bracket and is slidably connected to the bracket.

[0027] By adopting the above technical solution, the distance between the upper hanging plate and the bracket can be adjusted by rotating the handwheel to drive the adjusting screw, thereby adjusting the depth of the lower scraper immersed in the plasticizing liquid. The operation is very simple and convenient.

[0028] The present invention is further configured such that the structure of the cooling mechanism is the same as the structure of the dip-coating body.

[0029] By adopting the above technical solution, when the workpiece is cooled, the lifting mechanism of the cooling mechanism drives the solution tank to rise, so that the workpiece is immersed in the cooling water in the solution tank, thereby achieving cooling and temperature reduction.

[0030] The present invention is further configured such that the filtration system includes:

[0031] The first storage tank is used to store the dip coating liquid containing impurities, and the discharge pipe is connected to the first storage tank;

[0032] The second storage tank is used to store clean dipping solution, and the dipping solution in the second storage tank is transported to the solution tank by the second pump.

[0033] A first filtration mechanism is used to filter the dip coating solution containing impurities.

[0034] A softening device for softening the passed dip coating solution;

[0035] The dip coating solution in the first storage tank enters the first filtration mechanism through the first pump and softening device. After being filtered by the first filtration mechanism, the clean dip coating solution enters the second storage tank.

[0036] By adopting the above technical solution, the dip coating liquid discharged through the discharge pipe in the dip coating mechanism enters the first storage tank. The dip coating liquid containing impurities in the first storage tank enters the first filtration mechanism for filtration through the first pump and softening device, and the filtered clean dip coating liquid is transported to the second storage tank for storage. The second storage tank provides clean dip coating liquid to the solution tank, and so on for recycling.

[0037] The present invention is further configured such that: the first filtering mechanism includes:

[0038] The filter cylinder has a connecting through hole in the center for connecting to the drive shaft. Multiple filter grooves are formed around the central shaft on the outer wall of the filter cylinder. Filter plates for filtration are provided at the opening of each filter groove. The upper and lower ends of the filter cylinder are respectively provided with a first inlet and a first outlet that correspond one-to-one with and are connected to the filter grooves. The opening diameter of the first inlet is larger than the opening diameter of the first outlet.

[0039] The lower drainage plate is arranged in a ring shape. The lower drainage plate has a first inlet cavity and a first outlet cavity. The upper side of the lower drainage plate has a second outlet and a third inlet that communicate with the first inlet cavity and the first outlet cavity, respectively. The lower side of the lower drainage plate has a second inlet and a third outlet that communicate with the first inlet cavity and the first outlet cavity, respectively. The second outlet is simultaneously connected to multiple adjacent first inlets.

[0040] The upper drainage plate is arranged in a ring shape. A second drainage cavity is opened in the upper drainage plate. A fourth outlet and a fourth inlet are respectively provided on the upper and lower sides of the upper drainage plate, which are connected to the second drainage cavity. The fourth inlet is simultaneously connected to multiple adjacent first outlets.

[0041] A receiving box is fitted around the outside of the filter cylinder. A clean chamber is provided between the inner side of the receiving box and the outer side of the filter cylinder. The receiving box is provided with a fifth outlet connected to a second storage box. The fifth outlet is connected to the inlet end of the second storage box through a second pipeline.

[0042] The upper and lower drainage plates each have a connecting through hole at their center for the drive shaft to pass through. The filter cylinder, upper drainage plate, and lower drainage plate are coaxially arranged. The filter cylinder is rotatably connected between the upper and lower drainage plates. The filter groove communicating with the first inlet cavity is also communicating with the second outlet cavity. The fourth outlet is connected to the inlet end of the first pump through a first pipeline. The outlet end of the softening device is connected to the second inlet. The filter groove on the filter cylinder communicating with the first inlet cavity and the second outlet cavity is designated as the filtration zone, and the filter groove communicating with the first outlet cavity is designated as the backflushing zone. The number of filter grooves in the filtration zone is greater than the number of filter grooves in the backflushing zone.

[0043] By adopting the above technical solution, since the filter cylinder rotates between the upper and lower guide plates, while the positions of the filtration zone and backwash zone relative to the lower and upper guide plates are fixed, the filter tank will reach the filtration zone first during the rotation of the filter cylinder. The dip coating liquid conveyed from the first storage tank passes through the second inlet, the first inlet cavity, and the second outlet in sequence before entering the filter tank in the filtration zone. The dip coating liquid entering the filter tank will split into two streams, and the flow directions of the two dip coating liquids are perpendicular. The first stream flows outward, passes through the filter plate for filtration, flows into the clean cavity, and is then conveyed to the second storage tank from the fifth outlet. Impurities are blocked on the inner side of the filter plate. The second stream of dip coating liquid flows towards the first outlet in the filter tank. The process involves flushing away impurities adhering to the inner side of the filter plates, cleaning the inner side of the filter plates, reducing impurity accumulation, and preventing it from affecting the filtration effect. Then, the liquid is sent out from the first outlet and sequentially passes through the fourth inlet, the second outlet chamber, and the fourth outlet back to the inlet end of the first pump and is sent back into the filtration zone, effectively extending the service life of the filter plates and making their cleaning cycle longer. Then, the filter tank reaches the backwash zone, where the clean plastic coating liquid in the clean chamber flows inward through the filter plates in the filtration zone and enters the filter tank connected to the first outlet chamber, backwashing and cleaning the impurities stuck on the filter plates. This prevents impurities from getting stuck or stuck in the gaps of the filter plates due to the long-term outward flow of the plastic coating liquid, effectively extending the service life of the filter plates.

[0044] The present invention is further configured such that: the first filtering mechanism further includes:

[0045] The first sealing ring is located on the upper side of the lower drainage plate, and the first sealing ring has openings that match the second outlet and the third inlet.

[0046] The second sealing ring is located on the lower side of the upper drainage plate, and the second sealing ring has an opening that matches the fourth inlet.

[0047] The first sealing ring and the second sealing ring are respectively attached to the lower and upper sides of the filter cylinder.

[0048] By adopting the above technical solution, the first sealing ring can effectively prevent the dip coating liquid from leaking between the lower guide plate and the filter cylinder, and ensure that the first inlet is connected only when it corresponds to the second outlet or the third inlet. When the first inlet does not correspond to the second outlet or the third inlet, it is sealed by the first sealing ring, so the dip coating liquid in the filter tank will not flow out or flow in. The second sealing ring can effectively prevent the dip coating liquid from leaking between the upper guide plate and the filter cylinder, and ensure that the first outlet is connected only when it corresponds to the fourth inlet. When the first outlet does not correspond to the fourth inlet, it is sealed by the second sealing ring, so the dip coating liquid in the filter tank will not flow out or flow in.

[0049] The invention is further configured such that: the third outlet is connected to the inlet of the first pump via a third pump; the outlet of the first pump is connected to the inlet of the first three-way valve; the two outlets of the first three-way valve are respectively connected to the inlet of the softening device and the second filtration mechanism; the other end of the second filtration mechanism is connected to the inlet of the second storage tank via a third pipeline; the third pipeline is equipped with a one-way valve that allows the second filtration mechanism to flow towards the second storage tank; the outlet of the second pump is connected to the inlet of the second three-way valve; the two outlets of the second three-way valve are respectively connected to the solution tank and the third three-way valve; the third three-way valve is connected between the fifth outlet and the inlet of the second storage tank; and a solenoid valve is provided at the inlet of the second inlet.

[0050] By adopting the above technical solution, the filtration system has two working states. In the filtration state, the connecting through hole of the filter cylinder is driven to rotate by the drive shaft, so that the filter grooves on the filter cylinder pass through the filtration zone one by one, thereby sending the plasticizing liquid into the filter grooves that pass through the filtration zone in sequence. The filter grooves in the filtration zone filter the plasticizing liquid. Then, as the filter cylinder rotates, the filter grooves with plasticizing liquid reach the backwash zone. The pumping of the third pump creates a negative pressure in the first outlet chamber. The plasticizing liquid in the clean chamber passes through the filter plate and enters the filter groove connected to the first outlet chamber, which backwashes and cleans the impurities stuck on the filter plate. This prevents impurities from getting stuck or stuck in the gaps of the filter plate under the long-term outward flow of plasticizing liquid, effectively extending the service life of the filter plate. The filter cylinder can perform both filtration and backwashing cleaning during one rotation, effectively extending the service life and cleaning cycle of the filter plate.

[0051] Cleaning status: After a period of use, as clean dip coating solution is continuously filtered out, impurities remain in the circulating system of the filter cartridge (i.e., the first pipeline and the first storage tank). Therefore, the concentration of impurities in the dip coating solution in the circulating system will increase. When there are too many impurities, by closing the third pump and the solenoid valve, and switching the first three-way valve, the second three-way valve, and the third three-way valve, the filter cartridge continues to rotate. At this time, the clean dip coating solution in the second storage tank is drawn out by the second pump and sequentially sent through the second three-way valve, the third three-way valve, and the fifth outlet into the clean chamber. Under the action of the first pump, a negative pressure is generated in the filter tank in the filtration zone. The plasticizing liquid in the clean chamber is drawn into the filter tank to backwash and clean the filter plates. Then, it passes through the second outlet chamber, the first pipeline, the first pump, the first three-way valve, and the second filtration mechanism for filtration. Finally, it is sent to the second storage tank through the third pipeline for storage. This can effectively filter and clean the remaining high impurity concentration plasticizing liquid in the circulating system. As the filter cylinder rotates, it can backwash and clean the filter plates in each filter tank, and transport all impurities to the second filtration mechanism for filtration and collection.

[0052] When in filtration mode, the second filtration unit can be cleaned offline, effectively improving work efficiency without needing to stop the machine for cleaning.

[0053] An automated dip coating production process, characterized by comprising the following steps:

[0054] S1: Hang the workpiece to be dipped in plastic on the rack;

[0055] S2: The hanging rack is conveyed on the conveyor frame, and the hanging rack with the workpiece is conveyed to the heating mechanism in the preheating station for preheating. The temperature is set to 250℃-300℃ and the time is 3-8 minutes.

[0056] S3: After the preheating is completed, the workpiece is transported to the dip coating station. Then, the base lifting mechanism on the dip coating mechanism drives the solution tank to rise, so that the workpiece is immersed in the dip coating liquid in the solution tank. After the dip coating is completed, the lifting mechanism drives the solution tank to fall.

[0057] S4: After the dip coating is completed, the workpiece is transported to the heating mechanism in the curing station for heating and curing. The temperature is set to 200℃-240℃ and the time is 3-5 minutes.

[0058] S5: After the workpiece has been cured, it is transported to the cooling station. Then, the lifting mechanism on the cooling mechanism drives the solution tank to rise, so that the workpiece is immersed in the cooling water in the solution tank for cooling. After cooling is completed, the lifting mechanism drives the solution tank to fall.

[0059] S6: After cooling, the workpiece is transported to the unloading station, the workpiece is removed, and the processing is completed.

[0060] By adopting the above technical solution, the workpiece is preheated before dip coating, which effectively improves the dip coating effect on the workpiece surface and makes it adhere more firmly. Then, it is sent to the curing station for heating and curing to solidify the dip coating liquid on the workpiece surface. Finally, it is cooled down by the cooling mechanism to complete the processing and unloading. Only loading and unloading require manual operation, while the rest is automated, which effectively improves work efficiency and dip coating effect. Attached Figure Description

[0061] 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 these drawings without creative effort.

[0062] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present invention;

[0063] Figure 2 This is a schematic diagram of the dip coating mechanism in a specific embodiment of the present invention;

[0064] Figure 3 This is a cross-sectional view of the dip-coating mechanism in a specific embodiment of the present invention;

[0065] Figure 4 for Figure 3 Schematic diagram of the structure of A;

[0066] Figure 5 This is a schematic diagram of the cooling mechanism in a specific embodiment of the present invention;

[0067] Figure 6 This is a schematic diagram of the filtration system in a specific embodiment of the present invention;

[0068] Figure 7 This is a cross-sectional view of the first filtering mechanism in a specific embodiment of the present invention;

[0069] Figure 8 This is a three-dimensional cross-sectional view of the first filtering mechanism in a specific embodiment of the present invention. Figure 1 ;

[0070] Figure 9 This is a three-dimensional cross-sectional view of the first filtering mechanism in a specific embodiment of the present invention. Figure 2 ;

[0071] Figure 10 The structural explosion of the first filtration mechanism in a specific embodiment of the present invention Figure 1 ;

[0072] Figure 11 The structural explosion of the first filtration mechanism in a specific embodiment of the present invention Figure 2 ;

[0073] Figure 12 This is a cross-sectional view of the heating mechanism in a specific embodiment of the present invention. Figure 1 ;

[0074] Figure 13 for Figure 12 A schematic diagram of the structure of B in the middle;

[0075] Figure 14 This is a cross-sectional view of the heating mechanism in a specific embodiment of the present invention. Figure 2 . Detailed Implementation

[0076] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0077] like Figures 1-14 As shown, this invention discloses an automated dip coating production line, comprising,

[0078] The conveyor frame 1 is provided with a loading station 100, a preheating station 101, a dip-coating station 102, a curing station 103, a cooling station 104 and a unloading station 105 in sequence. The conveyor frame 1 is provided with a plurality of hooks 10 for hooking workpieces. The hooks 10 pass through the loading station 100, the preheating station 101, the dip-coating station 102, the curing station 103, the cooling station 104 and the unloading station 105 in sequence.

[0079] Heating mechanism 2, wherein two heating mechanisms 2 are provided and are respectively located on the preheating station 101 and the curing station 103;

[0080] Dip coating mechanism 3, which is located below dip coating station 102;

[0081] Cooling mechanism 4 is located below cooling station 104.

[0082] By adopting the above technical solution, the workpiece is hung on the hanger 10 at the loading station 100, and then moves with the conveyor 1 to the heating mechanism 2 at the preheating station 101 to preheat the workpiece, then to the dip coating station 102 to dip the workpiece, then to the heating mechanism 2 at the curing station 103 to heat and cure the dip-coated workpiece, then to the cooling station 104 to cool and reduce the temperature of the cured workpiece, and finally to the unloading station 105 to remove the processed workpiece, and then to the loading station 100 to hang a new workpiece to be dipped, and the cycle repeats; only one person is needed to perform the loading and unloading operations, and no other personnel are needed at other positions, which effectively improves the degree of automation and improves the quality and efficiency of dip coating.

[0083] In this embodiment of the invention, the dip-coating mechanism 3 includes a dip-coating body, a scraping mechanism for scraping the surface of the dip-coating liquid in the dip-coating body, and a filtration system for filtering the dip-coating liquid discharged from the dip-coating body. The dip-coating body includes:

[0084] Solution tank 30, the upper side of the solution tank 30 is open, the solution tank 30 stores a flowing medium, and the bottom of the solution tank 30 is provided with a discharge port, the discharge port is connected to a discharge pipe 35;

[0085] The base 31 is provided with a lifting mechanism 32, which is connected to the bottom of the solution tank 30 and is used to drive the solution tank 30 to move vertically relative to the base 31.

[0086] A limiting seat 310 is provided in a plurality of units and is mounted on a base 31;

[0087] The limiting rod 311 is slidably connected to the limiting seat 310. The limiting rod 311 is fixedly connected to the bottom of the solution tank 30 and passes through the base 31.

[0088] By adopting the above technical solution, when the workpiece moves above the dip coating mechanism 3, the lifting mechanism 32 on the base 31 drives the solution tank 30 to rise, immersing the workpiece in the dip coating liquid. After the dip coating is completed, the lifting mechanism 32 drives the solution tank 30 to fall. By moving the solution tank 30 up and down while the workpiece remains stationary, the stability of the workpiece during dip coating can be effectively improved, making it less prone to shaking and effectively improving the quality of dip coating. Through the cooperation of the limit seat 310 and the limit rod 311, the lifting of the solution tank 30 can be made more stable and less prone to shaking.

[0089] In this embodiment of the invention, the scraping mechanism includes:

[0090] Waste trough 300 surrounds the outside of the open edge of solution tank 30. The bottom of waste trough 300 is lower than the open edge of solution tank 30. The bottom of waste trough 300 is provided with a discharge port connected to discharge pipe 35.

[0091] Scraper 33 is arranged in an inverted "L" shape. The scraper 33 includes an upper hanging plate 330 and a lower scraper 331. The upper hanging plate 330 is arranged horizontally, and the lower scraper 331 is arranged vertically perpendicular to the upper hanging plate 330.

[0092] The bracket 34 has a drive mechanism connected to both ends. The drive mechanism includes a slider 340, a lead screw 341 threadedly connected to the slider 340, and a motor 342 that drives the lead screw 341 to rotate. The bracket 34 is fixedly connected to the slider 340. The drive mechanism is located on the edge of the opening of the waste tank 300. The bracket 34 is located above the solution tank 30.

[0093] The scraper 33 is located below the bracket 34 via a height adjustment mechanism, and the lower side of the scraper 331 is lower than the horizontal height of the opening of the solution tank 30.

[0094] By adopting the above technical solution, the lower scraper 331 is immersed in the dip coating liquid. After the workpiece is dipped, the motor 342 drives the lead screw 341 to rotate, thereby moving the slider 340. The slider 340 drives the bracket 34 and the scraper 33 to move at the opening of the solution tank 30, thereby scraping off the surface of the dip coating liquid and effectively cleaning the impurities floating on the surface of the dip coating liquid. The scraped dip coating liquid and impurities flow into the waste tank 300 for collection and are discharged from the discharge port and discharge pipe 35.

[0095] In this embodiment of the invention, the height adjustment mechanism includes:

[0096] Adjusting nut 36, which is fixedly installed in the middle of bracket 34;

[0097] An adjusting screw 37 is threadedly connected to an adjusting nut 36. The lower end of the adjusting screw 37 is rotatably connected to the middle part of the upper hanging plate 330. The adjusting screw 37 does not move relative to the upper hanging plate 330. A rotating handwheel 370 is provided at the upper end of the adjusting screw 37.

[0098] Guide rod 38 is vertically fixed on upper hanging plate 330, and guide rod 38 passes through bracket 34 and is slidably connected to bracket 34.

[0099] By adopting the above technical solution, the distance between the upper hanging plate 330 and the bracket 34 can be adjusted by rotating the handwheel 370 to drive the adjusting screw 37 to rotate, thereby adjusting the depth of the lower scraper 331 immersed in the plasticizing liquid. The operation is very simple and convenient.

[0100] In this embodiment of the invention, the structure of the cooling mechanism 4 is the same as that of the dip-coated body.

[0101] By adopting the above technical solution, when the workpiece is cooled, the lifting mechanism of the cooling mechanism 4 drives the solution tank to rise, so that the workpiece is immersed in the cooling water of the solution tank, thereby achieving cooling and temperature reduction.

[0102] In this embodiment of the invention, the filtration system includes:

[0103] The first storage tank 501 is used to store the dip coating liquid containing impurities, and the discharge pipe 35 is connected to the first storage tank 501.

[0104] The second storage tank 502 is used to store clean dip coating solution. The dip coating solution in the second storage tank 502 is transported to the solution tank 30 by the second pump 505.

[0105] The first filtration mechanism 6 is used to filter the dip coating liquid containing impurities.

[0106] A softening device 503 is used to soften the passed dip coating solution.

[0107] The dip coating liquid in the first storage tank 501 enters the first filtration mechanism 6 through the first pump 504 and the softening device 503. After being filtered by the first filtration mechanism 6, the clean dip coating liquid enters the second storage tank 502.

[0108] By adopting the above technical solution, the dip coating liquid discharged from the dip coating mechanism 3 through the discharge pipe 35 enters the first storage tank 501. The dip coating liquid containing impurities in the first storage tank 501 enters the first filtration mechanism 6 for filtration through the first pump 504 and the softening device 503, and the filtered clean dip coating liquid is transported to the second storage tank 502 for storage. The second storage tank 502 provides clean dip coating liquid to the solution tank 30, and so on for recycling.

[0109] In this embodiment of the invention, the first filtering mechanism 6 includes:

[0110] The filter cylinder 60 has a connecting through hole 600 at its center for connecting to a drive shaft. Multiple filter grooves 601 are formed around the central shaft on the outer wall of the filter cylinder 60. Filter plates 602 for filtration are provided at the opening of each filter groove 601. The upper and lower ends of the filter cylinder 60 are respectively provided with a first inlet 603 and a first outlet 604 that correspond one-to-one with and communicate with the filter grooves 601. The opening diameter of the first inlet 603 is larger than the opening diameter of the first outlet 604.

[0111] The lower drainage plate 61 is arranged in a ring shape. The lower drainage plate 61 has a first inlet cavity 610 and a first outlet cavity 611. The upper side of the lower drainage plate 61 has a second outlet 612 and a third inlet 613 that communicate with the first inlet cavity 610 and the first outlet cavity 611, respectively. The lower side of the lower drainage plate 61 has a second inlet 614 and a third outlet 615 that communicate with the first inlet cavity 610 and the first outlet cavity 611, respectively. The second outlet 612 is simultaneously connected to a plurality of adjacent first inlets 603.

[0112] The upper drainage plate 62 is arranged in a ring shape. The upper drainage plate 62 has a second outlet cavity 620. The upper and lower sides of the upper drainage plate 62 are respectively provided with a fourth outlet 622 and a fourth inlet 621 that communicate with the second outlet cavity 620. The fourth inlet 621 is simultaneously connected to multiple adjacent first outlets 604.

[0113] The container 63 is sleeved on the outside of the filter cylinder 60. A clean chamber 630 is provided between the inner side of the container 63 and the outer side of the filter cylinder 60. The container 63 is provided with a fifth outlet 631 connected to the second storage tank 502. The fifth outlet 631 is connected to the inlet end of the second storage tank 502 through a second pipeline 507.

[0114] The upper and lower drainage plates 62 and 61 each have a connecting through hole 600 at their centers for the drive shaft to pass through. The filter cylinder 60, the upper drainage plate 62, and the lower drainage plate 61 are coaxially arranged. The filter cylinder 60 is rotatably connected between the upper drainage plate 62 and the lower drainage plate 61. The filter groove 601, which communicates with the first inlet cavity 610, is also connected with the second outlet cavity 620. The fourth outlet 622 is connected to the inlet end of the first pump 504 through the first pipeline 506. The outlet end of the softening device 503 is connected to the second inlet 614. The filter groove 601 on the filter cylinder 60 that communicates with the first inlet cavity 610 and the second outlet cavity 620 is designated as a filter zone 605. The filter groove 601 that communicates with the first outlet cavity 611 is designated as a backflushing zone 606. The number of filter grooves 601 in the filter zone 605 is greater than the number of filter grooves 601 in the backflushing zone 606.

[0115] By adopting the above technical solution, since the filter cylinder 60 rotates between the upper guide plate 62 and the lower guide plate 61, while the positions of the filter zone 605 and the backwash zone 606 relative to the lower guide plate 61 and the upper guide plate 62 are fixed, during the rotation of the filter cylinder 60, the filter tank 601 will first reach the filter zone 605. The dip-molding liquid conveyed from the first storage tank 501 passes through the second inlet 614, the first inlet cavity 610, and the second outlet 612 in sequence and then enters the filter tank 601 in the filter zone 605. The dip-molding liquid entering the filter tank 601 will be divided into two streams, and the flow directions of the two dip-molding liquids are perpendicular. The first stream flows outward, passes through the filter plate 602 for filtration, flows into the clean cavity 630, and then is conveyed to the second storage tank 502 from the fifth outlet 631. Impurities are blocked on the inner side of the filter plate 602. The second stream of dip-molding liquid flows from the filter tank 601 to the first outlet 602. The flow of liquid in the filter 602 washes away impurities adhering to its inner surface, cleaning the inside of the filter 602, reducing impurity accumulation, and preventing it from affecting the filtration effect of the filter 602. The liquid is then discharged from the first outlet 604 and sequentially transported through the fourth inlet 621, the second outlet chamber 620, and the fourth outlet 622 back to the inlet of the first pump 504 and re-entered into the filtration zone 605, effectively extending the service life of the filter 602 and making its cleaning cycle longer. Then, the filter tank 601 reaches the backwash zone 606, where the clean plasticizing liquid in the clean chamber 630 flows inward through the filter 602 in the filtration zone 605 and into the filter tank 601 connected to the first outlet chamber 611. This backwashes and cleans the impurities stuck on the filter 602, preventing them from becoming stuck or trapped in the gaps of the filter 602 due to the long-term outward flow of the plasticizing liquid, effectively extending the service life of the filter 602.

[0116] In this embodiment of the invention, the first filtering mechanism 6 further includes:

[0117] The first sealing ring 66 is located on the upper side of the lower drainage plate 61, and the first sealing ring 66 has an opening that matches the second outlet 612 and the third inlet 613.

[0118] The second sealing ring 67 is located on the lower side of the upper drainage plate 62, and the second sealing ring 67 has an opening that matches the fourth inlet 621.

[0119] The first sealing ring 66 and the second sealing ring 67 are respectively attached to the lower and upper sides of the filter cylinder 60.

[0120] By adopting the above technical solution, the first sealing ring 66 can effectively prevent the dip coating liquid from leaking between the lower drain plate 61 and the filter cylinder 60, and ensure that the first inlet 603 is connected only when it corresponds to the second outlet 612 or the third inlet 613. When the first inlet 603 does not correspond to the second outlet 612 or the third inlet 613, it is sealed by the first sealing ring 66, so the dip coating liquid in the filter tank 601 will not flow out or flow in; the second sealing ring 67 can effectively prevent the dip coating liquid from leaking between the upper drain plate 62 and the filter cylinder 60, and ensure that the first outlet 604 is connected only when it corresponds to the fourth inlet 621. When the first outlet 604 does not correspond to the fourth inlet 621, it is sealed by the second sealing ring 67, so the dip coating liquid in the filter tank 601 will not flow out or flow in.

[0121] In this embodiment of the invention, the third outlet 615 is connected to the inlet of the first pump 504 via the third pump 508. The outlet of the first pump 504 is connected to the inlet of the first three-way valve 509. The two outlets of the first three-way valve 509 are respectively connected to the inlet of the softening device 503 and the second filter mechanism 510. The other end of the second filter mechanism 510 is connected to the inlet of the second storage tank 502 via the third pipeline 511. The third pipeline 511 is provided with a one-way valve 512 that causes the second filter mechanism 510 to flow toward the second storage tank 502. The outlet of the second pump 505 is connected to the inlet of the second three-way valve 513. The two outlets of the second three-way valve 513 are respectively connected to the solution tank 30 and the third three-way valve 514. The third three-way valve 514 is connected between the fifth outlet 631 and the inlet of the second storage tank 502. A solenoid valve 515 is provided at the inlet of the second inlet 614.

[0122] By adopting the above technical solution, the filtration system has two working states. In the filtration state, the connecting through-hole 600 of the filter cylinder 60 is driven to rotate by the drive shaft, causing the filter grooves 601 on the filter cylinder 60 to pass through the filtration zone 605 one by one. This sequentially feeds the plasticizing liquid into the filter grooves 601 that pass through the filtration zone 605. The plasticizing liquid is filtered by the filter grooves 601 that pass through the filtration zone 605. Then, as the filter cylinder 60 rotates, the filter grooves 601 containing the plasticizing liquid reach the backwash zone 606, where it is extracted by the third pump 508. A negative pressure is generated in the first outlet chamber 611, and the plasticizing liquid in the clean chamber 630 passes through the filter plate 602 and enters the filter tank 601 connected to the first outlet chamber 611. This backwashes and cleans the impurities stuck on the filter plate 602, preventing impurities from getting stuck or stuck in the gaps of the filter plate 602 under the long-term outward flow of the plasticizing liquid. This effectively extends the service life of the filter plate 602, allowing the filter cylinder 60 to perform both filtration and backwashing during one rotation, effectively extending the service life and cleaning cycle of the filter plate 602.

[0123] Cleaning state: After a period of use, as the clean dip coating liquid is continuously filtered out, while the impurities remain in the circulating system of the filter cylinder 60, that is, the first pipeline 506 and the first storage tank 501. Therefore, the impurity concentration in the dip coating liquid in the circulating system will become higher and higher. When there are too many impurities, by closing the third pump 508 and the solenoid valve 515, and switching the first three-way valve 509, the second three-way valve 513 and the third three-way valve 514, the filter cylinder 60 remains in a rotating state. At this time, the clean dip coating liquid in the second storage tank 502 is pumped out by the second pump 505 and sequentially passes through the second three-way valve 513, the third three-way valve 514, and the fifth outlet 631 into the clean chamber 630. Under the action of the first pump 504, a negative pressure will be generated in the filter tank 601 in the filtration area 605, and the dip coating liquid in the clean chamber 630 will be sucked into the filter tank 601 to perform backwashing cleaning on the filter plate 602. Then, it sequentially passes through the second extraction chamber 620, the first pipeline 506, the first pump 504, the first three-way valve 509, and the second filtering mechanism 510 for filtration, and then is sent into the second storage tank 502 for storage through the third pipeline 511. It can effectively filter and clean the dip coating liquid with a high impurity concentration remaining in the circulating system. And as the filter cylinder 60 rotates, it can perform backwashing cleaning on the filter plates 602 in each filter tank 601, and convey all the impurities into the second filtering mechanism 510 for filtration and collection;

[0124] When in the filtration state, the second filtering mechanism 510 can be cleaned offline, effectively improving the working efficiency without stopping the machine for cleaning.

[0125] In the embodiment of the present invention, the heating mechanism 2 includes:

[0126] The inner layer plate 20 is arranged in a "冂" shape. A first fan 200 is provided at the top of the inner layer plate 20. The first fan 200 is used to blow the air outside the top of the inner layer plate 20 to the inside of the inner layer plate 20. A plurality of air outlets 201 are provided at equal intervals along the height direction on the left and right sides of the inner layer plate 20. A baffle 202 parallel to the inner layer plate 20 is provided outside the inner layer plate 20 corresponding to the air outlet 201. The upper side of the baffle 202 is vertically connected to the inner layer plate 20, and an air inlet 203 is formed between the lower side of the baffle 202 and the inner layer plate 20;

[0127] The deflector 204 is inclined relative to the inner layer plate 20. The deflector 204 is arranged above the baffle 202. The lower side of the deflector 204 is connected to the upper side of the baffle 202, and the upper side of the deflector 204 is connected to the outside of the inner layer plate 20;

[0128] The outer layer plate 21 is arranged in a "mouth" shape and wraps around the outside of the inner layer plate 20. There is an air guiding channel 22 between the outer layer plate 21 and the inner layer plate 20. The parts of the left and right sides of the outer layer plate 21 corresponding to the flow guiding plates 204 are bent towards the inner layer plate 20, and the bending angles and lengths are the same. The part of the outer layer plate 21 corresponding to the baffle plate 202 is parallel to the baffle plate 202, so that the outer layer plate 21 gradually approaches the inner layer plate 20 from bottom to top;

[0129] The support feet 23, and there is a housing 24 above the support feet 23. The housing 24 covers the outside of the outer layer plate 21;

[0130] The heating rod 25 is arranged below the inner layer plate 20;

[0131] Among them, the conveying rack 1 passes through the inside of the inner layer plate 20. There is an air guiding gap 26 for air to pass through between the lower parts of the left and right sides of the inner layer plate 20 and the bottom of the outer layer plate 21. The air guiding gap 26 is connected to the bottom of the air guiding channel 22. The bottom of the air guiding channel 22 is provided with a second blower 27 for upwardly conveying air.

[0132] By adopting the above technical solution, the hanging rack 10 on the conveying rack 1 brings the workpiece into the inner layer plate 20. The air in the inner layer plate 20 is heated by the heating rod 25 and enters the air guiding channel 22. When the air flows upward in the air guiding channel 22, it blows into the inner layer plate 20 through the air outlet 201 in sequence, heating the workpiece hanging on the hanging rack 10. As it gradually flows upward, the gap between the inner layer plate 20 and the outer layer plate 21 gradually decreases, so that the air volume blown out by the air outlets 201 at different heights remains quite the same, making the heating of the workpiece more uniform. Finally, the first blower 200 blows hot air from top to bottom on the workpiece, further improving the heating uniformity and making the heating of the workpiece more comprehensive.

[0133] An automatic dip coating production process, which is characterized by including the following steps,

[0134] S1: Hang the workpiece to be dip coated on the hanging rack 10;

[0135] S2: The hanging rack 10 is conveyed on the conveying rack 1, and the hanging rack 10 with the workpiece is conveyed to the heating mechanism 2 at the preheating station 101 for preheating. The temperature is set at 250°C - 300°C, and the time is 3 - 8 minutes;

[0136] S3: Convey the preheated workpiece to the dip coating station 102. Then, the base 31 on the dip coating mechanism 3 and the lifting mechanism 32 drive the solution tank 30 to rise, so that the workpiece is immersed in the dip coating solution in the solution tank 30. After dip coating, the lifting mechanism 32 drives the solution tank 30 to descend;

[0137] S4: After the dip coating is completed, the workpiece is transported to the heating mechanism 2 of the curing station 103 for heating and curing. The temperature is set to 200℃-240℃ and the time is 3-5 minutes.

[0138] S5: After the workpiece has been cured, it is transported to the cooling station 104. Then, the lifting mechanism 32 on the cooling mechanism 4 drives the solution tank 30 to rise, so that the workpiece is immersed in the cooling water in the solution tank 30 for cooling. After cooling, the lifting mechanism 32 drives the solution tank 30 to fall.

[0139] S6: After cooling, the workpiece is transported to the unloading station 105, the workpiece is removed, and the processing is completed.

[0140] By adopting the above technical solution, the workpiece is preheated before dip coating, which effectively improves the dip coating effect on the workpiece surface and makes it adhere more firmly. Then, it is sent to the curing station for heating and curing to solidify the dip coating liquid on the workpiece surface. Finally, it is cooled down by the cooling mechanism to complete the processing and unloading. Only loading and unloading require manual operation, while the rest is automated, which effectively improves work efficiency and dip coating effect.

[0141] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automated dip coating production line, characterized in that, include, A conveyor frame (1) is provided with a loading station (100), a preheating station (101), a dip-coating station (102), a curing station (103), a cooling station (104), and a unloading station (105) in sequence. The conveyor frame (1) is provided with a plurality of hooks (10) for hooking workpieces. The hooks (10) pass through the loading station (100), the preheating station (101), the dip-coating station (102), the curing station (103), the cooling station (104), and the unloading station (105) in sequence. Heating mechanism (2), there are two heating mechanisms (2) respectively located at the preheating station (101) and the curing station (103); Dip coating mechanism (3), the dip coating mechanism (3) is located below the dip coating station (102); Cooling mechanism (4), the cooling mechanism (4) is located below the cooling station (104); The dip coating mechanism (3) includes a dip coating body and a filtration system for filtering the dip coating liquid discharged from the dip coating body. The dip coating body includes a solution tank (30), the upper side of which is open. The solution tank (30) stores a flowing medium. The bottom of the solution tank (30) is provided with a discharge port, which is connected to a discharge pipe (35). The filtration system includes: The first storage tank (501) is used to store the dip coating liquid containing impurities, and the discharge pipe (35) is connected to the first storage tank (501). The second storage tank (502) is used to store clean dip coating solution, and the dip coating solution in the second storage tank (502) is transported to the solution tank (30) by the second pump (505). The first filtration mechanism (6) is used to filter the dip coating liquid containing impurities; A softening device (503) is used to soften the passed dip coating solution; The dip coating liquid in the first storage tank (501) enters the first filter mechanism (6) through the first pump (504) and the softening device (503). After being filtered by the first filter mechanism (6), the clean dip coating liquid enters the second storage tank (502). The first filtration mechanism (6) includes: A filter cylinder (60) has a connecting through hole (600) at its center for connecting to a drive shaft. Multiple filter grooves (601) are provided around the central axis on the outer wall of the filter cylinder (60). Filter plates (602) for filtration are provided at the opening of the filter grooves (601). The upper and lower ends of the filter cylinder (60) are respectively provided with a first inlet (603) and a first outlet (604) that correspond one-to-one with and are connected to the filter grooves (601). The opening diameter of the first inlet (603) is larger than the opening diameter of the first outlet (604). The lower drainage plate (61) is arranged in a ring shape. The lower drainage plate (61) has a first inlet cavity (610) and a first outlet cavity (611) inside. The upper side of the lower drainage plate (61) is provided with a second outlet (612) and a third inlet (613) that are respectively connected to the first inlet cavity (610) and the first outlet cavity (611). The lower side of the lower drainage plate (61) is provided with a second inlet (614) and a third outlet (615) that are respectively connected to the first inlet cavity (610) and the first outlet cavity (611). The second outlet (612) is simultaneously connected to multiple adjacent first inlets (603). The upper drainage plate (62) is arranged in a ring shape. A second outlet cavity (620) is opened in the upper drainage plate (62). A fourth outlet (622) and a fourth inlet (621) communicating with the second outlet cavity (620) are respectively provided on the upper and lower sides of the upper drainage plate (62). The fourth inlet (621) is simultaneously connected to multiple adjacent first outlets (604). A receiving box (63) is fitted on the outside of the filter cylinder (60). A clean chamber (630) is provided between the inner side of the receiving box (63) and the outer side of the filter cylinder (60). A fifth outlet (631) is provided on the receiving box (63) and connected to the second storage box (502). The fifth outlet (631) is connected to the inlet end of the second storage box (502) through a second pipeline (507). The upper drainage plate (62) and the lower drainage plate (61) each have a connecting through hole (600) at their center for the drive shaft to pass through. The filter cylinder (60), the upper drainage plate (62), and the lower drainage plate (61) are coaxially arranged. The filter cylinder (60) is rotatably connected between the upper drainage plate (62) and the lower drainage plate (61). The filter groove (601) which communicates with the first inlet cavity (610) is also communicated with the second outlet cavity (620). The fourth outlet (622) is connected to the first pipe (506). The softening device (503) is connected to the inlet end of the first pump (504) and the outlet end of the softening device (503) is connected to the second inlet (614); the filter tank (601) on the filter cylinder (60) that communicates with the first inlet chamber (610) and the second outlet chamber (620) is set as the filter zone (605), and the filter tank (601) that communicates with the first outlet chamber (611) is set as the backflushing zone (606). The number of filter tanks (601) in the filter zone (605) is greater than the number of filter tanks (601) in the backflushing zone (606).

2. The automatic dip coating production line according to claim 1, characterized in that, The dip coating mechanism (3) further includes a scraping mechanism for scraping the surface of the dip coating liquid in the dip coating body, and the dip coating body further includes: A base (31) is provided with a lifting mechanism (32), which is connected to the bottom of the solution tank (30) to drive the solution tank (30) to move vertically relative to the base (31); A limiting seat (310) is provided in a plurality of such limiting seats and is installed on a base (31); A limiting rod (311) is slidably connected to a limiting seat (310). The limiting rod (311) is fixedly connected to the bottom of the solution tank (30). The limiting rod (311) passes through the base (31).

3. The automatic dip coating production line according to claim 2, characterized in that, The scraping mechanism includes: Waste tank (300) surrounds the outside of the open edge of solution tank (30), the bottom of waste tank (300) is lower than the open edge of solution tank (30), and the bottom of waste tank (300) is provided with a discharge port connected to discharge pipe (35). Scraper (33), the scraper (33) is arranged in an inverted "L" shape, the scraper (33) includes an upper hanging plate (330) and a lower scraper (331), the upper hanging plate (330) is arranged horizontally, and the lower scraper (331) is arranged vertically perpendicular to the upper hanging plate (330); The bracket (34) has a drive mechanism connected to both ends. The drive mechanism includes a slider (340), a lead screw (341) threadedly connected to the slider (340), and a motor (342) that drives the lead screw (341) to rotate. The bracket (34) is fixedly connected to the slider (340). The drive mechanism is located on the edge of the opening of the waste tank (300). The bracket (34) is located above the solution tank (30). The scraper (33) is located below the bracket (34) via a height adjustment mechanism, and the lower scraper (331) is lower than the horizontal height of the solution tank (30) opening.

4. An automatic dip coating production line according to claim 3, characterized in that, The height adjustment mechanism includes: Adjusting nut (36), the adjusting nut (36) is fixedly installed in the middle of bracket (34); An adjusting screw (37) is threadedly connected to an adjusting nut (36). The lower end of the adjusting screw (37) is rotatably connected to the middle of the upper hanging plate (330). The adjusting screw (37) does not move relative to the upper hanging plate (330). A rotating handwheel (370) is provided at the upper end of the adjusting screw (37). Guide rod (38), which is vertically fixed on the upper hanging plate (330), and the guide rod (38) passes through the bracket (34) and is slidably connected to the bracket (34).

5. An automatic dip coating production line according to claim 1, characterized in that, The structure of the cooling mechanism (4) is the same as that of the dip-coated body.

6. An automatic dip coating production line according to claim 1, characterized in that, The first filtration mechanism (6) further includes: The first sealing ring (66) is located on the upper side of the lower drainage plate (61), and the first sealing ring (66) has openings that match the second outlet (612) and the third inlet (613). The second sealing ring (67) is located on the lower side of the upper drainage plate (62), and the second sealing ring (67) has an opening that matches the fourth inlet (621); The first sealing ring (66) and the second sealing ring (67) are respectively attached to the lower and upper sides of the filter cylinder (60).

7. An automatic dip coating production line according to claim 1, characterized in that, The third outlet (615) is connected to the inlet of the first pump (504) via the third pump (508). The outlet of the first pump (504) is connected to the inlet of the first three-way valve (509). The two outlets of the first three-way valve (509) are respectively connected to the inlet of the softening device (503) and the second filter mechanism (510). The other end of the second filter mechanism (510) is connected to the inlet of the second storage tank (502) via the third pipeline (511). The third pipeline (511) is equipped with a... The second filtration mechanism (510) has a one-way valve (512) that flows towards the second storage tank (502). The outlet of the second pump (505) is connected to the inlet of the second three-way valve (513). The two outlets of the second three-way valve (513) are respectively connected to the solution tank (30) and the third three-way valve (514). The third three-way valve (514) is connected between the fifth outlet (631) and the inlet of the second storage tank (502). A solenoid valve (515) is provided at the inlet of the second inlet (614).

8. An automated dip coating production process, characterized in that, The automated dip coating production line as described in claim 1 includes the following steps: S1: Hang the workpiece to be dipped on the hanger (10); S2: The hanger (10) is conveyed on the conveyor (1) and the hanger (10) with the workpiece is conveyed to the heating mechanism (2) of the preheating station (101) for preheating. The temperature is set to 250℃-300℃ and the time is 3-8 minutes. S3: After the preheating is completed, the workpiece is transported to the dip coating station (102). Then, the base (31) lifting mechanism (32) on the dip coating mechanism (3) drives the solution tank (30) to rise, so that the workpiece is immersed in the dip coating liquid in the solution tank (30). After the dip coating is completed, the lifting mechanism (32) drives the solution tank (30) to fall. S4: After the dip coating is completed, the workpiece is transported to the heating mechanism (2) of the curing station (103) for heating and curing. The temperature is set to 200℃-240℃ and the time is 3-5 minutes. S5: After the workpiece has been cured, it is transported to the cooling station (104). Then, the lifting mechanism (32) on the cooling mechanism (4) drives the solution tank (30) to rise, so that the workpiece is immersed in the cooling water in the solution tank (30) for cooling. After the cooling is completed, the lifting mechanism (32) drives the solution tank (30) to fall. S6: After cooling, the workpiece is transported to the unloading station (105), the workpiece is removed, and the processing is completed.

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