Pressure flow paint dipping device and method

Abstract

The invention relates to the technical field of paint dipping devices, in particular to a pressure flow paint dipping device and method.The pressure flow paint dipping device comprises a paint dipping pool, a lifting assembly and a conveying mechanism, a plurality of inner pools communicated with one another are arranged in the paint dipping pool, and the lifting assembly is arranged at the top of the paint dipping pool; the conveying mechanism comprises a paint storage tank, an inverted circulating pump, a vacuum machine, a pressure pump, an air pipe assembly and a liquid pipe assembly, a paint gas separator communicated with the paint storage tank is arranged at the top of the paint storage tank, and the paint gas separator, the paint storage tank, the inverted circulating pump, the vacuum machine, the pressure pump, the air pipe assembly and the liquid pipe assembly are communicated through a plurality of valves; the liquid inlet and the liquid outlet are communicated with the paint storage tank through the liquid pipe assembly, and the inner pool is communicated with the paint-gas separator through the gas pipe assembly, so that the advantages of improving the coating quality, improving the production efficiency, reducing the environmental pollution, saving the cost, enhancing the safety and the like are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of paint dipping devices, and in particular to a pressure-flow paint dipping device and method. Background Art

[0002] The anti-corrosion coating of railway embedded parts is an important part to ensure the safety of railway infrastructure and extend its service life. The traditional immersion painting process is widely used in the anti-corrosion treatment of railway embedded parts because of its simple operation and relatively low cost. However, there are many problems in the actual application of this process, such as poor anti-sagging, improper application or too thick paint film, which often lead to defects such as bubbles, shrinkage holes, cracks, fish eyes, pits, pits, shrinkage and pinholes in the coating, which not only affect the aesthetics of the coating, but more seriously may affect the service life and safety of the workpiece, especially in the anti-corrosion paint coating of railway embedded parts. Once the air spots in the hidden parts of the workpiece are missed, it may cause rust and decay, and then cause major safety accidents. In addition, the immersion process is very volatile, and the open immersion paint pool directly evaporates into the vast space, resulting in a 30% loss of paint, which not only wastes resources, but also causes serious pollution to the environment. According to statistics, the general railway embedded parts metal company uses 3 million tons of paint each year, and the open paint pool evaporates 1 million yuan, which is costly and exceeds environmental protection standards. In the existing production process, the construction period is tight, and the workpieces after dipping often need to be checked for defects such as air spots and repainted by experienced workers before leaving the factory. However, this manual search and repainting method is inefficient and it is difficult to ensure that each workpiece can be fully inspected and processed. Therefore, in view of the shortcomings of the existing technology, such as unstable paint pressure, insufficient penetration, poor anti-sagging, and excessively thick paint film, an innovative solution is urgently needed to improve the quality and efficiency of anti-corrosion coating of railway embedded parts. Summary of the invention

[0003] In view of this, the present invention aims at the deficiencies of the prior art and proposes a pressure flow immersion paint device and method, aiming to solve at least one of the problems raised by the above background technology.

[0004] In the first aspect, the present invention provides a pressure-flow paint dipping device, comprising: a paint dipping pool, a plurality of inner pools interconnected with each other are arranged inside the paint dipping pool, a liquid inlet and a liquid outlet are respectively arranged at both ends of the paint dipping pool, the liquid inlet and the liquid outlet are both connected with the plurality of inner pools, the transverse cross-section of the paint dipping pool is a rectangular structure, positioning pin holes are respectively arranged at the four corners of the paint dipping pool, vertically arranged lifting guide columns are fixedly connected on the outer walls at the four corners of the paint dipping pool corresponding to the positioning pin holes, a lifting guide groove is arranged on the side of the lifting guide column close to the paint dipping pool, and a sealing gasket is fixedly connected around the top wall of the paint dipping pool;

[0005] A lifting component, wherein the lifting component is arranged on the top of the paint immersion tank, the bottom of the lifting component is fixedly connected to the top walls of the four lifting guide columns, the telescopic end of the bottom of the lifting component is fixedly connected to the paint immersion tank cover plate, the four corners of the paint immersion tank cover plate are respectively slidably connected to the inner walls of the four lifting guide grooves, four positioning pins are respectively arranged at the four corners of the bottom of the paint immersion tank cover plate corresponding to the four positioning pin holes, and a plurality of workpiece hanger hanging grooves for hanging a workpiece frame are arranged at the bottom of the paint immersion tank cover plate;

[0006] The conveying mechanism includes a paint storage tank, an inverted circulation pump, a vacuum machine, a pressure pump, an air pipe assembly, and a liquid pipe assembly. A paint gas separator connected to the paint storage tank is arranged on the top of the paint storage tank. The paint gas separator, paint storage tank, inverted circulation pump, vacuum machine, pressure pump, air pipe assembly, and liquid pipe assembly are connected through multiple valves. The liquid inlet and the liquid outlet are connected to the paint storage tank through the liquid pipe assembly, and the inner pool is connected to the paint gas separator through the air pipe assembly.

[0007] In some embodiments, multiple inner pools are arranged in sequence along a straight line, the transverse cross-section of the inner pool is a rectangular structure, the tops of both side walls of the multiple inner pools are provided with gas escape channels, the multiple gas escape channels are on the same straight line, the height of the multiple inner pools is smaller than the height inside the paint immersion pool, and the axial cross-section of the bottom of the multiple inner pools is a V-shaped structure.

[0008] In some embodiments, strip interfaces are alternately arranged on both sides of two adjacent inner pools, and the interiors of the multiple inner pools are connected through the multiple strip interfaces to form a serpentine channel, the liquid inlet is connected to the strip interface of the inner pool near the left end of the paint immersion pool, and the liquid outlet is connected to the strip interface of the inner pool near the right end of the paint immersion pool, and pressure gauges for detecting the liquid inlet pressure and the liquid outlet pressure are provided at the liquid inlet and the liquid outlet.

[0009] In some embodiments, the lifting assembly includes:

[0010] A support frame, wherein the transverse cross-section of the support frame is a rectangular structure, and the four corners of the bottom of the support frame are respectively fixedly connected to the top walls of the four lifting guide columns;

[0011] Two support plates are provided, and the two support plates are cross-arranged inside the support frame, and the two ends of the two support plates are respectively fixedly connected to the four vertices inside the support frame;

[0012] A driving motor, wherein the driving motor is arranged at the intersection of the two supporting plates, and a mounting end of the driving motor is fixedly connected to the top of the supporting plate;

[0013] Rotating components, there are four rotating components, and the four rotating components are arranged on the top of the two supporting plates in a circular array with the driving motor as the center, and the four rotating components are respectively meshed and connected with the output ends of the driving motor.

[0014] In some embodiments, the rotating assembly comprises:

[0015] A rotating frame, one end of which is fixedly connected to the side wall of the driving motor, and the bottom of the other end of the rotating frame is fixedly connected to the top wall of the supporting plate through a plurality of supporting columns;

[0016] A branch gear, wherein a plurality of branch gears are provided, and the plurality of branch gears are provided between the support plate and the rotating frame, the plurality of branch gears are meshed and connected in sequence along the length direction of the rotating frame, the top and bottom of the plurality of branch gears are rotatably connected to the bottom of the rotating frame and the top of the support plate respectively, and the branch gear close to the driving motor is meshed and connected to the output end of the driving motor;

[0017] The main shaft gear is arranged on the side of the top of the support plate away from the driving motor, and the main shaft gear is arranged between the support plate and the rotating frame. The main shaft gear is meshed and connected with the branch gear close to the side of the main shaft gear. The output end of the driving motor can drive multiple branch gears to rotate, and multiple branch gears drive the main shaft gear to rotate.

[0018] In some embodiments, the lifting assembly also includes a rotating column, and the rotating columns are provided with 4 rotating columns, and the 4 rotating columns correspond to the 4 main shaft gears respectively. The outer wall of the rotating column is provided with an external thread, and a rotating hole matching the rotating column is provided at the center of the main shaft gear, and an internal thread matching the external thread of the rotating column is provided on the inner wall of the rotating hole. The rotating column is arranged at the bottom of the support frame, and the top of the rotating column passes through the support plate, the rotating hole and the rotating frame in sequence upward. A thrust bearing is arranged at the connection between the rotating column, the support plate and the rotating frame, and the rotating column is threadedly connected to the rotating hole. When the output end of the driving motor rotates, the 4 rotating columns can be driven to make vertical linear motion at the same time, and the bottoms of the 4 rotating columns are respectively fixedly connected to the top of the paint immersion pool cover.

[0019] In some embodiments, the workpiece frame is a cubic structure frame, and the bottom of the workpiece frame is formed by a plurality of support rods arranged at intervals in a transverse manner to form a paint dipping rack, and the two ends of the plurality of support rods are respectively fixedly connected to the two side walls of the bottom of the workpiece frame, and a plurality of reinforcing ribs are arranged at intervals on the top of the workpiece frame, and vertical pulleys are respectively fixedly connected to the two sides of the top of the workpiece frame corresponding to the plurality of reinforcing ribs, and when the top of the workpiece frame is extended into the workpiece hanger hanging groove, it is slidably connected to the inner wall of the workpiece hanger hanging groove through the plurality of vertical pulleys, and a spring fixing pin is provided through the top of one end of the workpiece frame, and the outer diameter of the workpiece frame matches the inner diameter of the inner pool, and the workpiece frame is used to extend into the interior of the inner pool.

[0020] In some embodiments, the trachea assembly comprises:

[0021] a first ventilation pipe, one end of which passes through the paint immersion pool and the inner pool near one side of the first ventilation pipe in sequence, the first ventilation pipe is connected to the interior of the inner pool, the first ventilation pipe and the plurality of gas escape channels are in a straight line, and the pressure gauge is provided on the side of the first ventilation pipe near the paint immersion pool, a CF01 valve is provided on the first ventilation pipe on the left side of the pressure gauge, a CF03 valve is provided on the first ventilation pipe on the left side of the CF01 valve, and a CF07 valve is provided on the first ventilation pipe on the left side of the CF03 valve;

[0022] a second ventilation pipe, the second ventilation pipe is arranged on the first ventilation pipe between the CF03 valve and the CF07 valve, one end of the second ventilation pipe is connected with the first ventilation pipe through the CF04 valve, the other end of the second ventilation pipe is connected with the first connecting port of the vacuum machine, the vacuum machine is fixedly connected to the ground, and a plurality of pressure gauges are arranged on the top of the vacuum machine;

[0023] a third ventilation pipe, one end of which is connected to the second connection port of the vacuum machine through a CF08 valve, the other end of the first ventilation pipe is connected to the left side of the CF08 valve on the third ventilation pipe, a CF10 valve is provided on the left side of the first ventilation pipe on the third ventilation pipe, and the other end of the third ventilation pipe is connected to the paint gas separator;

[0024] A hot air pipe, one end of which is arranged on the first ventilation pipe between the CF01 valve and the CF03 valve, one end of which is connected to the first ventilation pipe through the CF02 valve, and the other end of which is connected to a thermal energy device capable of generating hot air.

[0025] In some embodiments, the liquid pipe assembly includes:

[0026] A first liquid pipe, one end of which is connected to the paint storage tank via an AF01 valve, an AF04 valve is provided on the first liquid pipe on the right side of the AF01 valve, the other end of which is connected to the liquid outlet via an AF07 valve, and a plurality of liquid inlet pipes with valves are provided on the paint storage tank;

[0027] a second liquid pipe, one end of which is disposed on the first liquid pipe between the AF01 valve and the AF04 valve, the second liquid pipe is in communication with the first liquid pipe, the second liquid pipe is in communication with the inverted circulation pump, the second liquid pipe is provided with an AF05 valve on the right side of the inverted circulation pump, the second liquid pipe is provided with an AF06 valve on the right side of the AF05 valve, and the other end of the second liquid pipe is in communication with the liquid inlet;

[0028] A third liquid pipe, one end of which is disposed on the first liquid pipe between the AF04 valve and the AF07 valve, one end of which is in communication with the first liquid pipe, and a BF02 valve is disposed on the third liquid pipe;

[0029] a fourth liquid pipe, one end of the fourth liquid pipe is arranged on the second liquid pipe and is located between the first liquid pipe and the inverted circulation pump, one end of the fourth liquid pipe is connected to the second liquid pipe through a BF01 valve, the other end of the third liquid pipe is arranged on the fourth liquid pipe and is located on the right side of the BF01 valve, the other end of the third liquid pipe is connected to the fourth liquid pipe, a BF06 valve is arranged on the fourth liquid pipe and is located on the right side of the third liquid pipe, the other end of the fourth liquid pipe is connected to one side of the pressure pump, the other side of the pressure pump is connected to a fifth liquid pipe, and a BF07 valve is arranged on the fifth liquid pipe;

[0030] a sixth liquid pipe, one end of which is disposed on the fourth liquid pipe and located between the third liquid pipe and the BF06 valve, one end of which is communicated with the fourth liquid pipe through the BF04 valve, the other end of which is disposed on the second liquid pipe and located between the AF05 valve and the AF06 valve, the other end of which is communicated with the second liquid pipe through the BF03 valve;

[0031] a seventh liquid pipe, one end of the seventh liquid pipe is arranged on the sixth liquid pipe and is located between the BF04 valve and the BF03 valve, one end of the seventh liquid pipe is communicated with the sixth liquid pipe through a BF05 valve, a BF08 valve is arranged on the seventh liquid pipe and is located on the right side of the BF05 valve, the right end of the BF08 valve is communicated with one end of a downwardly curved insulation pipe, and a BF09 valve is arranged on the other end of the downwardly curved insulation pipe, one end of the fifth liquid pipe away from the pressure pump is arranged on the seventh liquid pipe and is located between the BF05 valve and the BF08 valve, one end of the fifth liquid pipe away from the pressure pump is communicated with the seventh liquid pipe, the bent end of the downwardly curved insulation pipe is communicated with a fourth ventilation pipe through a CF05 valve, and one end of the fourth ventilation pipe away from the downwardly curved insulation pipe is communicated with a third connecting port of the vacuum machine through a CF06 valve;

[0032] A main half-moon tube, the main half-moon tube is arranged inside the paint immersion pool, the main half-moon tube penetrates multiple inner pools, the main half-moon tube coincides with the axis lines of the multiple inner pools, a plurality of first scattering holes are arranged at intervals on the top of the main half-moon tube, a plurality of pool concave paint extraction holes are arranged at intervals on the bottom of the two side walls of the main half-moon tube, one end of the main half-moon tube close to the vacuum machine penetrates the inner pool and the paint immersion pool and extends to the outside of the paint immersion pool, and the pressure gauge is arranged on one end of the main half-moon tube close to the vacuum machine;

[0033] A plurality of branch and trunk semi-lunar tubes are provided, and the plurality of branch and trunk semi-lunar tubes are respectively provided corresponding to the plurality of inner pools, the plurality of branch and trunk semi-lunar tubes are provided perpendicular to the main trunk semi-lunar tube, the bottom walls of the plurality of branch and trunk semi-lunar tubes are respectively connected to the bottoms of the plurality of inner pools, the tops of the branch and trunk semi-lunar tubes are provided with a plurality of second scattering holes arranged at intervals, and the plurality of branch and trunk semi-lunar tubes are all connected to the main trunk semi-lunar tube;

[0034] an eighth liquid pipe, one end of the eighth liquid pipe being connected with one end of the main half-moon pipe close to the vacuum machine through a BF10 valve, a BF12 valve being arranged on the eighth liquid pipe on the left side of the BF10 valve, a BF11 valve being arranged on the eighth liquid pipe on the left side of the BF12 valve, the other end of the eighth liquid pipe being connected with a thermal energy device capable of generating hot gas, an end of the seventh liquid pipe close to the eighth liquid pipe being arranged on the eighth liquid pipe between the BF10 valve and the BF12 valve, and an end of the seventh liquid pipe close to the eighth liquid pipe being connected with the eighth liquid pipe.

[0035] In some embodiments, the paint gas separator comprises:

[0036] A pipe body, the bottom of which is connected and communicated with the top of the paint storage tank, a paint gas inlet is provided at the top of the side wall of the pipe body, the paint gas inlet is communicated with the third ventilation pipe, the pressure gauge is provided at the top of the pipe body, and an exhaust pipe communicated with the inside of the pipe body is provided at the top of the other side of the pipe body;

[0037] A plurality of vertical plates are provided, and the plurality of vertical plates are arranged in a circular array inside the tube body with the center of the tube body as the axis, and one end of the plurality of vertical plates close to the side wall of the tube body is fixedly connected to the inner wall of the tube body, and a plurality of paint liquid flow components are arranged axially at intervals between the plurality of vertical plates, and the plurality of paint liquid flow components are arranged below the paint gas inlet and the exhaust pipe.

[0038] In some embodiments, the paint flow assembly includes:

[0039] An upper template, the upper template is a shell with an opening at the bottom and an upward protrusion at the axis, the outer diameter of the upper template is smaller than the inner diameter of the tube body, the side walls of the upper template are respectively fixedly connected to the sides of the plurality of vertical plates away from the inner wall of the tube body, and a paint liquid flow port is formed between the upper template and the inner wall of the tube body;

[0040] The lower template is a funnel with a top opening larger than a bottom opening. The lower template is arranged at the bottom of the upper template. The outer diameter of the lower template matches the inner diameter of the tube body. The side wall of the lower template passes through multiple vertical plates and is sealed and connected to the side wall of the tube body.

[0041] In a second aspect, the present invention provides a pressure-flow immersion coating method, comprising the following steps:

[0042] S1. In the initial stage, multiple workpiece frames with workpieces are loaded into the inner pool respectively, and the cover plate of the immersion pool is pressed to the top of the immersion pool by the rotating column, and the AF01 valve, AF05 valve, AF06 valve, AF07 valve and CF01 valve, CF03 valve, CF07 valve, CF10 valve are opened, and the motor of the reverse circulation pump is started to rotate forward. At this time, the paint liquid in the paint storage tank is extracted to transport the paint liquid to the inner pool until the pool is full, and the air in the inner pool enters the paint gas separator on the top of the paint storage tank through the gas escape channel, the first ventilation pipe and the second ventilation pipe. The pressure gauge on the first ventilation pipe and the pressure gauge on the paint gas separator display the paint liquid pressure value to determine whether the air at the bottom of the immersion pool cover is emptied; when it is necessary to speed up the speed of the paint liquid flowing into the inner pool, the BF01 valve, BF06 valve, BF07 valve, BF08 valve, BF09 valve, BF10 valve can be opened, and the pressure pump can be started to scatter the paint flow to the inner pool through the main semi-lunar pipe and the branch semi-lunar pipe;

[0043] S2. Confirm that the working status after the inner pool is filled with paint liquid includes:

[0044] In the pressure flow state, open the AF04 valve, and the paint liquid in the liquid pipe and the inner pool will perform pressure flow circulation. In the pressure flow circulation state, open the BF01 valve or close the BF01 valve and open the BF02 valve, BF06 valve, pressure pump, BF07 valve, BF08 valve, BF09 valve, and BF10 valve to scatter the paint flow into the inner pool through the main half-moon pipe;

[0045] Static pressure state, after the inner pool is filled with paint liquid, close all valves and pumps. At this time, the inner pool is in a static pressure state, and the static pressure is atmospheric pressure. Or open the AF01 valve, BF06 valve, BF07 valve, BF08 valve, BF09 valve, BF10 valve, and start the pressure pump to add paint liquid to the closed inner pool and increase the pressure;

[0046] In the vacuum state, after the inner pool is filled with paint liquid, close all valves and pumps. Under the static pressure state of the inner pool, open the CF01 valve, CF03 valve, CF04 valve, CF08 valve, and CF10 valve, and start the vacuum machine to vacuum the inner pool;

[0047] S3. The paint liquid is pumped back to the paint storage tank, and all valves and pumps are closed. Only the AF01 valve, AF05 valve, AF06 valve, AF07 valve, BF02 valve, BF04 valve, BF03 valve, BF05 valve, BF08 valve, BF09 valve, BF10 valve, CF01 valve, CF03 valve, CF07 valve, and CF10 valve are opened. The motor of the inverted circulation pump is started to rotate in the reverse direction. When the paint liquid in the inner pool is emptied, the AF01 valve, the inverted circulation pump, the AF05 valve, the CF05 valve, and the CF06 valve are opened. The vacuum machine is started to pump out the remaining paint at the bottom of the inner pool and in the pipe valve, and then the vacuum machine is closed and all valves are closed.

[0048] S4, drying, open the CF01 valve, CF02 valve, BF10 valve, BF11 valve, BF12 valve, hot air circulates in the closed inner pool, and the drying operation is divided into two states: one is to preheat the unpainted workpiece; the other is to heat and dry the paint film on the surface of the painted workpiece.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows: through the stable painting technology of the pressure-flow paint immersion pool, bubbles and residues on the surface of the workpiece can be effectively eliminated, and the paint liquid can fully penetrate into the entire surface of the workpiece, thereby significantly improving the uniformity and adhesion of the coating, reducing the occurrence of coating defects such as shrinkage holes, cracks, fish eyes, etc., and the combined use of an inverted circulation pump and an enhanced pressure flow pump accelerates the speed of the paint liquid infusing the paint immersion pool, shortens the production cycle, and improves production efficiency. At the same time, by accurately controlling the thickness of the paint film, the waste of resources and the difficulty of subsequent processing caused by the excessive thickness of the paint film are reduced. By optimizing the paint immersion process, the volatilization loss of the paint is reduced, and the pollution to the environment is reduced. In particular, when the paint is dipped in a vacuum state, the volatilization of the paint can be further reduced, which meets the environmental protection requirements. Drying in a sealed pool can reduce the volatilization loss of the paint and reduce the pollution to the environment.

[0050] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0051] Other features and aspects of the present disclosure will become more apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 An axonometric diagram of a pressure-flow immersion paint device provided in an embodiment of the present invention;

[0054] Figure 2 An axonometric diagram of a pressure-flow immersion paint device provided in an embodiment of the present invention;

[0055] Figure 3 An axonometric diagram of a pressure-flow immersion paint device provided in an embodiment of the present invention;

[0056] Figure 4 A top view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0057] Figure 5 A front view of a pressure-flow immersion paint device provided in an embodiment of the present invention;

[0058] Figure 6 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0059] Figure 7 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0060] Figure 8 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0061] Fig. 9 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0062] Fig.10 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0063] Fig.11 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0064] Fig.12 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0065] Fig.13 A partial enlarged view of a pressure-flow paint dipping device provided in an embodiment of the present invention;

[0066] Fig.14 A top view of the inner pool of the pressure-flow immersion paint device provided in an embodiment of the present invention;

[0067] Fig.15 A front structural cross-sectional view of an inner pool of a pressure-flow immersion paint device provided in an embodiment of the present invention;

[0068] Fig.16 A front structural cross-sectional view of a paint gas separator of a pressure-flow paint immersion device provided in an embodiment of the present invention;

[0069] Fig.17 A front structural sectional view of the main half-moon tube of the pressure-flow immersion paint device provided in an embodiment of the present invention.

[0070] Among them: 1. Paint immersion tank; 2. Inner tank; 3. Liquid inlet; 4. Liquid outlet; 5. Positioning pin hole; 6. Lifting guide column; 7. Lifting guide groove; 8. Sealing pad; 9. Paint immersion tank cover; 10. Positioning pin; 11. Workpiece hanger hanging groove; 12. Paint storage tank; 13. Inverted circulation pump; 14. Vacuum machine; 15. Pressure pump; 16. Paint gas separator; 17. Gas escape channel; 18. Strip interface; 19. Pressure gauge; 20. Support frame; 21. Support plate; 22. Drive motor; 23. Rotating frame; 24. Branch gear; 2 5. Spindle gear; 26. Rotating column; 27. Rotating hole; 28. Workpiece frame; 29. ​​Support rod; 30. Reinforcement rib; 31. Hanging pulley; 32. Spring fixing pin; 33. First ventilation pipe; 34. CF01 valve; 35. CF03 valve; 36. CF07 valve; 37. Second ventilation pipe; 38. CF04 valve; 39. Third ventilation pipe; 40. CF08 valve; 41. CF10 valve; 42. Hot air pipe; 43. CF02 valve; 44. First liquid pipe; 45. AF01 valve; 46, AF04 valve; 47, liquid inlet pipeline; 48, second liquid pipe; 49, AF05 valve; 50, AF07 valve; 51, AF06 valve; 52, third liquid pipe; 53, BF02 valve; 54, fourth liquid pipe; 55, BF01 valve; 56, BF06 valve; 57, fifth liquid pipe; 58, BF07 valve; 59, sixth liquid pipe; 60, BF04 valve; 61, BF03 valve; 62, seventh liquid pipe; 63, BF05 valve; 64, BF08 valve; 65, lower bend diaphragm Heat pipe; 66, BF09 valve; 67, CF05 valve; 68, CF06 valve; 69, main half-moon pipe; 70, first scattering hole; 71, pool draw hole; 72, branch half-moon pipe; 73, second scattering hole; 74, eighth liquid pipe; 75, BF10 valve; 76, BF12 valve; 77, BF11 valve; 78, pipe body; 79, paint gas inlet; 80, exhaust pipe; 81, vertical plate; 82, upper template; 83, paint liquid flow port; 84, lower template; 85, support column; 86, fourth ventilation pipe. DETAILED DESCRIPTION

[0071] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0072] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0073] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0074] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] As mentioned in the background technology, in the existing production process, the construction period is tight, and the workpieces after dipping paint often need to be checked for defects such as air spots and repainted by experienced workers before leaving the factory. However, this manual search and repainting method is inefficient, and it is difficult to ensure that each workpiece can be fully inspected and processed. Therefore, in view of the shortcomings of the existing technology, such as unstable paint pressure, insufficient penetration, poor anti-sagging, and excessively thick paint film, an innovative solution is urgently needed to improve the quality and efficiency of anti-corrosion coating of railway embedded parts.

[0076] In order to improve the above problems, a pressure-flow immersion paint device and method proposed in the present application can effectively eliminate bubbles and residues on the surface of the workpiece through the stable coating technology of the pressure-flow immersion paint pool, so that the paint liquid can fully penetrate into the entire surface of the workpiece, thereby significantly improving the uniformity and adhesion of the coating, reducing the occurrence of coating defects such as shrinkage holes, cracks, fish eyes, etc., and using an inverted circulation pump and an enhanced pressure flow pump in combination to accelerate the speed of the paint liquid infusing the immersion paint pool, shorten the production cycle, and improve production efficiency. At the same time, by accurately controlling the thickness of the paint film, the waste of resources and the difficulty of subsequent processing caused by the excessive thickness of the paint film are reduced. By optimizing the immersion paint process, the volatilization loss of the paint is reduced, and the pollution to the environment is reduced. In particular, immersion paint in a vacuum state can further reduce the volatilization of the paint, which meets environmental protection requirements. Drying in a sealed pool can reduce the volatilization loss of the paint and reduce the pollution to the environment.

[0077] See also Figure 1-17 As shown, the first embodiment:

[0078] A pressure-flow immersion paint device according to an embodiment of the present application includes:

[0079] A paint dipping pool 1, wherein a plurality of inner pools 2 interconnected with each other are arranged inside the paint dipping pool 1, a liquid inlet 3 and a liquid outlet 4 are respectively arranged at both ends of the paint dipping pool 1, the liquid inlet 3 and the liquid outlet 4 are both connected with the plurality of inner pools 2, the transverse cross-section of the paint dipping pool 1 is a rectangular structure, and positioning pin holes 5 are respectively arranged at the four corners of the paint dipping pool, and vertically arranged lifting guide columns 6 are fixedly connected on the outer walls at the four corners of the paint dipping pool 1 corresponding to the positioning pin holes 5, and a lifting guide groove 7 is arranged on the side of the lifting guide column 6 close to the paint dipping pool 1, and a sealing gasket 8 is fixedly connected around the top wall of the paint dipping pool 1;

[0080] A lifting component, wherein the lifting component is arranged at the top of the paint immersion pool 1, the bottom of the lifting component is respectively fixedly connected to the top walls of the four lifting guide columns 6, the telescopic end of the bottom of the lifting component is fixedly connected to the paint immersion pool cover plate 9, the four corners of the paint immersion pool cover plate 9 are respectively slidably connected to the inner walls of the four lifting guide grooves 7, four positioning pins 10 are respectively arranged at the four corners of the bottom of the paint immersion pool cover plate 9 corresponding to the four positioning pin holes 5, and a plurality of workpiece hanger hanging grooves 11 for hanging a workpiece frame 28 are arranged at the bottom of the paint immersion pool cover plate 9;

[0081] The conveying mechanism includes a paint storage tank 12, an inverted circulation pump 13, a vacuum machine 14, a pressure pump 15, an air pipe assembly, and a liquid pipe assembly. A paint gas separator 16 connected to the paint storage tank 12 is arranged on the top of the paint storage tank 12. The paint gas separator 16, the paint storage tank 12, the inverted circulation pump 13, the vacuum machine 14, the pressure pump 15, the air pipe assembly, and the liquid pipe assembly are connected through multiple valves, wherein the multiple valves refer to: CF01 valve, CF03 valve, CF0 7 valves, CF04 valves, CF08 valves, CF10 valves, CF02 valves, AF01 valves, AF04 valves, AF05 valves, AF07 valves, AF06 valves, BF02 valves, BF01 valves, BF06 valves, BF07 valves, BF04 valves, BF03 valves, BF05 valves, BF08 valves, BF09 valves, CF05 valves, CF06 valves, BF10 valves, BF12 valves, BF11 valves. The liquid inlet 3 and the liquid outlet 4 are connected to the paint storage tank 12 through the liquid pipe assembly, and the inner pool 2 is connected to the paint gas separator 16 through the air pipe assembly.

[0082] In some specific embodiments, the plurality of inner pools 2 are arranged in a straight line in sequence, the transverse cross-section of the inner pool 2 is a rectangular structure, the tops of the two side walls of the plurality of inner pools 2 are provided with gas escape channels 17, the plurality of gas escape channels 17 are on the same straight line, the height of the plurality of inner pools 2 is less than the height inside the paint immersion pool 1, or the height of the plurality of inner pools 2 is equal to the height inside the paint immersion pool 1. The axial cross-section of the bottom of the plurality of inner pools 2 is a V-shaped structure, and it can be understood that the bottom axis of each inner pool is the lowest point, and the two sides of the axis gradually tilt upward to form a V-shaped groove.

[0083] In some specific embodiments, strip interfaces 18 are alternately arranged on both sides of two adjacent inner pools 2, and the interiors of the multiple inner pools 2 are connected through the multiple strip interfaces 18 to form a serpentine channel, the liquid inlet 3 is connected with the strip interface 18 of the inner pool 2 near the left end of the paint immersion pool 1, and the liquid outlet 4 is connected with the strip interface 18 of the inner pool 2 near the right end of the paint immersion pool 1, and the liquid inlet 3 and the liquid outlet 4 are both provided with pressure gauges 19 for detecting the liquid inlet pressure and the liquid outlet pressure.

[0084] In some specific embodiments, the lifting assembly includes:

[0085] A support frame 20, wherein the transverse cross section of the support frame 20 is a rectangular structure, and the four corners of the bottom of the support frame 20 are respectively fixedly connected to the top walls of the four lifting guide columns 3;

[0086] Two support plates 21 are provided, and the two support plates 21 are cross-arranged inside the support frame 20, and the two ends of the two support plates 21 are respectively fixedly connected to the four vertices inside the support frame 20;

[0087] A driving motor 22, wherein the driving motor 22 is disposed at the intersection of the two supporting plates 21, and a mounting end of the driving motor 22 is fixedly connected to the top of the supporting plate 21;

[0088] There are four rotating components, and the four rotating components are arranged on the top of the two support plates 21 in a circular array with the drive motor 22 as the center, and the four rotating components are respectively engaged with the output ends of the drive motor 22, wherein the output end of the drive motor 22 is the power rotation end of the drive motor 22.

[0089] In some specific embodiments, the rotating assembly includes:

[0090] A rotating frame 23, one end of which is fixedly connected to the side wall of the driving motor 22, and the bottom of the other end of the rotating frame 23 is fixedly connected to the top wall of the supporting plate 21 through a plurality of supporting columns 85;

[0091] A branch gear 24, wherein a plurality of branch gears 24 are provided, and the plurality of branch gears 24 are provided between the support plate 21 and the rotating frame 23, the plurality of branch gears 24 are meshed and connected in sequence along the length direction of the rotating frame 23, the tops and bottoms of the plurality of branch gears 24 are rotatably connected to the bottom of the rotating frame 23 and the top of the support plate 21 respectively, and the branch gear 24 close to the side of the driving motor 22 is meshed and connected to the output end of the driving motor 22;

[0092] The main shaft gear 25 is arranged on the side of the top of the support plate 21 away from the driving motor, and the main shaft gear 25 is arranged between the support plate 21 and the rotating frame 23. The main shaft gear 25 is meshed and connected with the branch gear 24 close to the side of the main shaft gear 25. The output end of the driving motor 22 can drive multiple branch gears 24 to rotate, and multiple branch gears 24 drive the main shaft gear 25 to rotate.

[0093] In some specific embodiments, the lifting assembly further includes a rotating column, and there are four rotating columns 26, which correspond to the four main shaft gears 25 respectively. The outer wall of the rotating column 26 is provided with an external thread, and a rotating hole 27 matching the rotating column 26 is provided at the center of the main shaft gear 25. The inner wall of the rotating hole 27 is provided with an internal thread matching the external thread of the rotating column 26. The rotating column 26 is arranged at the bottom of the support frame 20, and the top of the rotating column 26 passes through the support plate 21, the rotating hole 27, and the rotating frame 23 in sequence. A thrust bearing is provided at the connection between the rotating column 26, the support plate 21 and the rotating frame 23. The moving column 26 is threadedly connected to the rotating hole 27. When the output end of the driving motor 22 rotates, the four rotating columns 26 can be driven to make vertical linear motion at the same time. The bottoms of the four rotating columns 26 are respectively fixedly connected to the top of the paint immersion pool cover 9. It can be understood that the four rotating columns 26 are driven to make linear motion up and down by the forward or reverse rotation of the driving motor 22, thereby driving the paint immersion pool cover 9 to make linear motion up and down. When the paint immersion pool cover 9 moves to the top of the paint immersion pool 1, the driving motor 22 stops rotating, and the four rotating columns 26 squeeze the paint immersion pool cover 9 downward. The bottom of the paint immersion pool cover 9 is in contact with the top of the sealing gasket 8, so that a closed space is formed between the paint immersion pool cover 9 and the multiple inner pools 2.

[0094] In some specific embodiments, the workpiece frame 28 is a cubic structure frame, and the bottom of the workpiece frame 28 is formed by a plurality of support rods 29 arranged at intervals in a transverse direction to form a paint dipping rack, and the paint dipping rack places the workpiece and drops it into the inner pool 2, and the two ends of the plurality of support rods 29 are respectively fixedly connected to the two side walls of the bottom of the workpiece frame 28, and the top of the workpiece frame 28 is provided with a plurality of reinforcing ribs 30 arranged at intervals, and the two sides of the top of the workpiece frame 28 corresponding to the plurality of reinforcing ribs 30 are respectively fixedly connected with hanging pulleys 31, and the top of the workpiece frame 28 extends into the workpiece hanging When the workpiece frame 28 is in the workpiece hanger hanging groove 11, it is slidably connected to the inner wall of the workpiece hanger hanging groove 11 through a plurality of hanging pulleys 31. A spring fixing pin 32 is provided through the top of one end of the workpiece frame 28. It can be understood that the installation end of the spring fixing pin 32 is fixedly connected to the workpiece frame 28, and the telescopic end of the spring fixing pin 32 passes through the top of the workpiece frame 28. When the entire workpiece frame 28 is extended into the workpiece hanger hanging groove 11, the telescopic end of the spring fixing pin 32 is rotated so that the top of the telescopic end of the spring fixing pin 32 is engaged with the bottom of the support frame 20 to prevent the workpiece frame 28 from moving. The outer diameter of the workpiece frame 28 matches the inner diameter of the inner pool 2, and the workpiece frame 28 is used to extend into the interior of the inner pool 2.

[0095] In some specific embodiments, the trachea assembly comprises:

[0096] A first ventilation pipe 33, one end of which passes through the paint immersion pool 1 and the inner pool 2 near one side of the first ventilation pipe 33 in sequence, the first ventilation pipe 33 is connected to the interior of the inner pool 2, the first ventilation pipe 33 and the plurality of gas escape channels 17 are in the same straight line, and the pressure gauge 19 is provided on the side of the first ventilation pipe 33 near the paint immersion pool 1, a CF01 valve 34 is provided on the first ventilation pipe 33 on the left side of the pressure gauge 19, wherein the left side is understood to be the side away from the inner pool 2, a CF03 valve 35 is provided on the first ventilation pipe 33 on the left side of the CF01 valve 34, and a CF07 valve 36 is provided on the first ventilation pipe 33 on the left side of the CF03 valve 35;

[0097] A second ventilation pipe 37, the second ventilation pipe 37 is arranged on the first ventilation pipe 33 and is located between the CF03 valve 35 and the CF07 valve 36, one end of the second ventilation pipe 37 is connected to the first ventilation pipe 33 through the CF04 valve 38, and the other end of the second ventilation pipe 37 is connected to the first connection port of the vacuum machine 14, the vacuum machine 14 is fixedly connected to the ground, and a plurality of pressure gauges 19 are arranged on the top of the vacuum machine 14;

[0098] A third ventilation pipe 39, one end of which is connected to the second connection port of the vacuum machine 14 through a CF08 valve 40, and the other end of the first ventilation pipe 33 is connected to the left side of the CF08 valve 40 on the third ventilation pipe 39, wherein the left side is understood as a side away from the vacuum machine 14, and a CF10 valve 41 is provided on the left side of the first ventilation pipe 33 on the third ventilation pipe 39, and the other end of the third ventilation pipe 39 is connected to the paint gas separator 16;

[0099] A hot air pipe 42, one end of which is arranged on the first ventilation pipe 33 between the CF01 valve 34 and the CF03 valve 35, one end of which is connected to the first ventilation pipe 33 through the CF02 valve 43, and the other end of which is connected to a thermal energy device capable of generating hot air.

[0100] In some specific embodiments, the liquid pipe assembly includes:

[0101] A first liquid pipe 44, one end of which is connected to the paint storage tank 12 via an AF01 valve 45, wherein a plurality of paint storage tanks 12 may be provided, an AF04 valve 46 is provided on the first liquid pipe 44 on the right side of the AF01 valve 45, wherein the right side is understood to be a side away from the paint storage tank 12, the other end of the first liquid pipe 44 is connected to the liquid outlet 4 via an AF07 valve 50, and a plurality of liquid inlet pipes 47 with valves are provided on the paint storage tank 12;

[0102] a second liquid pipe 48, one end of which is disposed on the first liquid pipe 44 between the AF01 valve 45 and the AF04 valve 46, the second liquid pipe 48 is in communication with the first liquid pipe 44, the second liquid pipe 48 is in communication with the inversion circulation pump 13, an AF05 valve 49 is disposed on the second liquid pipe 48 on the right side of the inversion circulation pump 13, an AF06 valve 51 is disposed on the second liquid pipe 48 on the right side of the AF05 valve 49, and the other end of the second liquid pipe 48 is in communication with the liquid inlet 3;

[0103] A third liquid pipe 52, one end of which is disposed on the first liquid pipe 44 between the AF04 valve 46 and the AF07 valve 50, one end of which is in communication with the first liquid pipe 44, and a BF02 valve 53 is disposed on the third liquid pipe 52;

[0104] a fourth liquid pipe 54, one end of the fourth liquid pipe 54 is arranged on the second liquid pipe 48 and is located between the first liquid pipe 44 and the inversion circulation pump 13, the inversion circulation pump 13 is a prior art, one end of the fourth liquid pipe 54 is connected with the second liquid pipe 48 through a BF01 valve 55, the other end of the third liquid pipe 52 is arranged on the fourth liquid pipe 54 and is located on the right side of the BF01 valve 55, the other end of the third liquid pipe 52 is connected with the fourth liquid pipe 54, a BF06 valve 56 is arranged on the fourth liquid pipe 54 and is located on the right side of the third liquid pipe 52, the other end of the fourth liquid pipe 54 is connected with one side of the pressure pump 15, the other side of the pressure pump 15 is connected with a fifth liquid pipe 57, and a BF07 valve 58 is arranged on the fifth liquid pipe 57;

[0105] a sixth liquid pipe 59, one end of which is disposed on the fourth liquid pipe 54 and located between the third liquid pipe 52 and the BF06 valve 56, one end of which is communicated with the fourth liquid pipe 54 via a BF04 valve 60, the other end of which is disposed on the second liquid pipe 48 and located between the AF05 valve 49 and the AF06 valve 51, the other end of which is communicated with the second liquid pipe 48 via a BF03 valve 61;

[0106] A seventh liquid pipe 62, one end of which is disposed on the sixth liquid pipe 59 between the BF04 valve 60 and the BF03 valve 61, one end of which is connected to the sixth liquid pipe 59 through a BF05 valve 63, a BF08 valve 64 is disposed on the seventh liquid pipe 62 on the right side of the BF05 valve 63, the right end of the BF08 valve 64 is connected to one end of a downwardly bent insulation pipe 65, and a BF09 valve 66 is disposed on the other end of the downwardly bent insulation pipe 65 , one end of the fifth liquid pipe 57 away from the pressure pump 15 is arranged on the seventh liquid pipe 62 and is located between the BF05 valve 63 and the BF08 valve 64, the one end of the fifth liquid pipe 57 away from the pressure pump 15 is connected to the seventh liquid pipe 62, the bent end of the downward-bent thermal insulation pipe 65 is connected to the fourth ventilation pipe 86 through the CF05 valve 67, and the one end of the fourth ventilation pipe 86 away from the downward-bent thermal insulation pipe 65 is connected to the third connection port of the vacuum machine 14 through the CF06 valve 68;

[0107] A main half-moon tube 69, wherein the main half-moon tube 69 is arranged inside the paint immersion pool 1, and the main half-moon tube 69 passes through the plurality of inner pools 2, and the main half-moon tube 69 coincides with the axis lines of the plurality of inner pools 2, and a plurality of first scattering holes 70 are arranged at intervals on the top of the main half-moon tube 69, and a plurality of pool concave paint extraction holes 71 are arranged at intervals on the bottom of the two side walls of the main half-moon tube 69, respectively, and one end of the main half-moon tube 69 close to the vacuum machine 14 passes through the inner pool 2 and the paint immersion pool 1 and extends to the outside of the paint immersion pool 1, and the pressure gauge 19 is arranged on one end of the main half-moon tube 69 close to the vacuum machine 14;

[0108] There are multiple branch semi-lunar tubes 72, and the multiple branch semi-lunar tubes 72 are respectively arranged corresponding to the multiple inner pools 2. The multiple branch semi-lunar tubes 72 are arranged perpendicular to the main semi-lunar tube 69, and the bottom walls of the multiple branch semi-lunar tubes 72 are respectively fitted and connected with the bottoms of the multiple inner pools 2. The tops of the branch semi-lunar tubes 72 are provided with multiple second scattering holes 73 arranged at intervals, and the multiple branch semi-lunar tubes 72 are all connected to the main semi-lunar tube 69; it can be understood that after the paint liquid in the paint immersion pool 1 enters the main semi-lunar tube 69 and the branch semi-lunar tubes 72, it flows into the interior of the multiple inner pools 2 through the first scattering hole 70, the pool recessed paint extraction hole 71, and the second scattering hole 73. When extracting the paint liquid, since the main semi-lunar tube 69 is arranged at the lowest point in the center of the multiple inner pools 2, the paint liquid in the inner pool 2 can be drained through the pool recessed paint extraction hole 71 arranged at the bottom.

[0109] an eighth liquid pipe 74, one end of the eighth liquid pipe 74 is connected to one end of the main half-moon pipe 69 close to the vacuum machine 14 through a BF10 valve 75, a BF12 valve 76 is provided on the eighth liquid pipe 74 on the left side of the BF10 valve 75, a BF11 valve 77 is provided on the eighth liquid pipe 74 on the left side of the BF12 valve 76, the other end of the eighth liquid pipe 74 is connected to a thermal energy device capable of generating hot gas, one end of the seventh liquid pipe 62 close to the eighth liquid pipe 74 is provided on the eighth liquid pipe 74 between the BF10 valve 75 and the BF12 valve 76, and one end of the seventh liquid pipe 62 close to the eighth liquid pipe 74 is connected to the eighth liquid pipe 74.

[0110] In some specific embodiments, the paint gas separator 16 includes:

[0111] A pipe body 78, the bottom of which is connected to and communicated with the top of the paint storage tank 12, a paint gas inlet 79 is provided at the top of the side wall of the pipe body 78, the paint gas inlet 79 is communicated with the third ventilation pipe 39, the pressure gauge 19 is provided at the top of the pipe body 78, and an exhaust pipe 80 communicated with the inside of the pipe body 78 is provided at the top of the other side of the pipe body 78;

[0112] A vertical plate 81, wherein a plurality of the vertical plates 81 are provided, and the plurality of the vertical plates 81 are arranged in a circular array inside the tube body 78 with the center of the tube body 78 as the axis, and one end of the plurality of the vertical plates 81 close to the side wall of the tube body 78 is fixedly connected to the inner wall of the tube body 78, and a plurality of the paint liquid flow components are arranged axially at intervals between the plurality of the vertical plates 81, and the plurality of the paint liquid flow components are arranged below the paint gas inlet 79 and the exhaust pipe 80.

[0113] In some specific embodiments, the paint liquid flow component includes:

[0114] An upper template 82, the upper template 82 is a shell with an opening at the bottom and an upward protrusion at the axis, the outer diameter of the upper template 82 is smaller than the inner diameter of the tube body 78, the side walls of the upper template 82 are respectively fixedly connected to the sides of the plurality of vertical plates 81 away from the inner wall of the tube body 78, and a paint liquid flow port 83 is formed between the upper template 82 and the inner wall of the tube body 78;

[0115] The lower template 84 is a funnel with a top opening larger than a bottom opening. The lower template 84 is arranged at the bottom of the upper template 82. The outer diameter of the lower template 84 matches the inner diameter of the tube body 78. The side wall of the lower template 84 passes through multiple vertical plates 81 and is sealed and connected to the side wall of the tube body 78.

[0116] Second embodiment:

[0117] A pressure-flow immersion coating method according to an embodiment of the present application comprises the following steps:

[0118] S1. In the initial stage, multiple workpiece frames 28 with workpieces are placed in the inner pool 2, and the paint pool cover 9 is pressed to the top of the paint pool 1 by the rotating column 26. The AF01 valve 45, AF05 valve 49, AF06 valve 51, AF07 valve 50 and CF01 valve 34, CF03 valve 35, CF07 valve 36, CF10 valve 41 are opened, and the motor of the reverse circulation pump 13 is started to rotate forward. At this time, the paint liquid in the paint storage tank 12 is drawn to transport the paint liquid to the inner pool 2 until the pool is full. The air in the inner pool 2 is released through the gas escape channel 17 and the first passage. The air pipe 33 and the second ventilation pipe 37 enter the paint gas separator 16 on the top of the paint storage tank 12, observe the pressure gauge 19 on the first ventilation pipe 33 and the pressure gauge 19 on the paint gas separator 16 to display the paint liquid pressure value, and judge whether the air at the bottom of the paint immersion pool cover 9 is emptied; when it is necessary to speed up the speed of the paint liquid flowing into the inner pool 2, the BF01 valve 55, BF06 valve 56, BF07 valve 58, BF08 valve 64, BF09 valve 66, BF10 valve 75 can be opened, and the pressure pump 15 can be started to scatter the paint flow to the inner pool 2 through the main semi-lunar pipe 69 and the branch semi-lunar pipe 72;

[0119] S2. Confirm that the working status after the inner tank 2 is filled with paint liquid includes:

[0120] In the pressure flow state, open the AF04 valve 46, and the paint liquid in the liquid pipe and the inner pool 2 performs pressure flow circulation motion. In the pressure flow circulation state, open the BF01 valve 55 or close the BF01 valve 55, open the BF02 valve 53, BF06 valve 56, pressure pump 15, BF07 valve 58, BF08 valve 64, BF09 valve 66, BF10 valve 75, and scatter the paint flow into the inner pool 2 through the main half-moon pipe 69;

[0121] In the static pressure state, after the inner pool 2 is filled with paint liquid, close all valves and pumps. At this time, the interior of the inner pool 2 is in a static pressure state, and the static pressure is atmospheric pressure or by opening AF01 valve 45, BF06 valve 56, BF07 valve 58, BF08 valve 64, BF09 valve 66, BF10 valve 75, and starting the pressure pump 15, add paint liquid to the closed inner pool 2 and increase the pressure; add paint liquid to the closed immersion paint pool and increase the pressure appropriately. The pressure increase value shall be strictly based on the technical indicators.

[0122] In the vacuum state, after the inner pool 2 is filled with paint liquid, close all valves and pumps. Under the static pressure state of the inner pool, open CF01 valve 34, CF03 valve 35, CF04 valve 38, CF08 valve 40, CF10 valve 41, and start the vacuum machine 14 to vacuum the inner pool 2; start the vacuum machine to vacuum the immersion paint pool until the vacuum value of the pressure gauge reaches the requirements set in the process regulations. Practice has proved that vacuum immersion painting can well promote the penetration of paint liquid and adhere to the surface of the workpiece.

[0123] S3, the paint liquid is pumped back to the paint storage tank 12, all valves and pumps are closed, and only AF01 valve 45, AF05 valve 49, AF06 valve 51, AF07 valve 50, BF02 valve 53, BF04 valve 60, BF03 valve 61, BF05 valve 63, BF08 valve 64, BF09 valve 66, BF10 valve 75, CF01 valve 34, CF03 valve 35, CF07 valve 36, CF10 valve 41 are opened, and the motor of the inverted circulation pump 13 is started to rotate in the reverse direction. When the paint liquid in the inner pool 2 is emptied, the AF01 valve 45 is closed, the inverted circulation pump 13 is closed, the AF05 valve 49 is closed, the CF05 valve 67, CF06 valve 68 are opened, and the vacuum machine 14 is started to remove the residual paint at the bottom of the inner pool 2 and in the pipe valve, and then the vacuum machine 14 is closed, and all valves are closed;

[0124] At this stage, the speed of the reverse circulation pump, that is, the speed of the paint liquid in the suction tank, depends on the required paint film thickness value, because the paint film thickness depends on the balance of forces when other factors such as the paint liquid viscosity have been determined. When the carrying force and the drainage force are balanced, a stagnation point will appear. The factors affected are the viscous flow state of the paint liquid, the drainage state and the capillary state. It is the balance of these forces that determines the thickness of the paint film.

[0125] S4, drying, open CF01 valve 34, CF02 valve 43, BF10 valve 75, BF11 valve 77, BF12 valve 76, hot air circulates in the closed inner pool 2, and the drying operation is divided into two operating states: one is preheating the unpainted workpiece; the other is heating and drying the paint film on the surface of the painted workpiece.

[0126] The relationship between the pressure and flow rate of the liquid is: the pressure increases, the flow rate increases; the pressure decreases, the flow rate decreases. In a closed container, the flow rate increases and the pressure decreases. Therefore, after the valve of the paint storage tank is closed in the present invention project, the inverted circulation pump and the pressure-enhanced flow pump in the closed paint dipping pool and pipeline are used to increase the flow rate of the paint liquid, and the increase in the pressure of the paint liquid can be ignored; of course, after the paint storage tank is opened, the amount of paint liquid is increased to a certain extent, and the hydraulic pressure in the paint dipping pool will increase accordingly; in addition, when the vacuum machine is started when the paint dipping pool is closed, the paint gas mixture is actually extracted, and the pressure in the paint dipping pool will be reduced accordingly. Strictly control the temperature rise of the paint liquid. The higher the temperature, the greater the pressure. Conversely, the lower the temperature, the lower the pressure. The pressure generated by the volume expansion of the liquid due to heat increases, but when the pressure in the closed space is less than the saturated vapor pressure of the liquid, the liquid will vaporize (physical change) or even decompose (chemical change), which is harmful to the quality of the paint dipping.

[0127] The role of vacuuming is that the enameled wire needs to be dipped in vacuum pressure to achieve full penetration and uniform paint film. The combined force of the mainstream and scattered flows makes the paint liquid in the pool flow fully, so that the workpiece can get a better and more comprehensive paint effect. For example, the modern car frame can also get a better paint effect by rolling it into the paint pool. However, this method is that the workpiece enters the paint liquid, the workpiece is moving and the paint liquid is passive, and it will inevitably bring in air bubbles to produce air spots; while the pressure flow is that the workpiece is passive and the paint liquid is active, and the paint liquid has no floating paint, and will not contact the air to produce too thick a paint film and paint nodules.

[0128] After sufficient immersion in paint, the inverted circulation pump is turned on to evacuate the immersion paint pool, which also keeps the paint liquid flowing away from the workpiece. At this time, the effect of free fall gravity on the paint film formation process can be basically ignored. Therefore, the effect of free fall gravity on the workpiece paint film is very weak compared to the paint flow force.

[0129] In the short time after the paint liquid is extracted, the volatility of the paint film on the workpiece is greatly suppressed in the closed paint pool. Based on the above factors, compared with the paint film formed by the paint liquid extracted from the workpiece in the open paint pool, the paint film formed on the workpiece in the closed paint pool can achieve better quality effects such as uniform thickness of the paint film.

[0130] The inverted circulation pump uses a DC motor that can rotate forward and reverse, and an intelligent controller with an AC / DC converter on the motor end cover to control the counterclockwise or clockwise direction, as well as the speed, output power and other related indicators of the inverted circulation pump's paint liquid flow direction, speed, work power and so on.

[0131] The paint gas separator utilizes the characteristic that the paint liquid flows and overflows gas after being spread out flat. The present invention innovates a paint gas separator not available on the market.

[0132] Two paint tanks are configured (or more paint tanks are available), and the paint tank is 1.2 to 1.5 times the capacity of the paint immersion tank. The two paint tanks are switched according to the needs of the workpiece, divided into primer and topcoat or second coat, and there are corresponding pipe valves for switching.

[0133] A hot air branch pipe is set in front of the high-pressure oil pipe at the outlet of the half-moon pipe. The half-moon pipe is a common device for hot air and high-pressure pipes. In order to prevent heat conduction, it is necessary to make insulation devices at the bifurcation. Downward bending insulation material pipes and insulation valves are set. Insulation devices including insulation valves are installed at the branch. The valve leading out of the bottom of the downward bending pipe is vacuumed and can also be used to repair the downward bending pipe.

[0134] The main function of the kinetic energy of the reverse circulation pump is to speed up the flow of the liquid. This is the function of the pressure flow to eliminate the gas attached to the surface of the workpiece.

[0135] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pressure-flow immersion paint device, characterized in that: include: A paint dipping pool, wherein a plurality of inner pools interconnected with each other are arranged inside the paint dipping pool, a liquid inlet and a liquid outlet are respectively arranged at both ends of the paint dipping pool, the liquid inlet and the liquid outlet are both connected with the plurality of inner pools, the transverse cross-section of the paint dipping pool is a rectangular structure, positioning pin holes are respectively arranged at the four corners of the paint dipping pool, and vertically arranged lifting guide columns are fixedly connected on the outer walls at the four corners of the paint dipping pool corresponding to the positioning pin holes, a lifting guide groove is arranged on the side of the lifting guide column close to the paint dipping pool, and a sealing gasket is fixedly connected around the top wall of the paint dipping pool; A lifting component, wherein the lifting component is arranged on the top of the paint immersion tank, the bottom of the lifting component is fixedly connected to the top walls of the four lifting guide columns, the telescopic end of the bottom of the lifting component is fixedly connected to the paint immersion tank cover plate, the four corners of the paint immersion tank cover plate are respectively slidably connected to the inner walls of the four lifting guide grooves, four positioning pins are respectively arranged at the four corners of the bottom of the paint immersion tank cover plate corresponding to the four positioning pin holes, and a plurality of workpiece hanger hanging grooves for hanging a workpiece frame are arranged at the bottom of the paint immersion tank cover plate; The conveying mechanism includes a paint storage tank, an inverted circulation pump, a vacuum machine, a pressure pump, an air pipe assembly, and a liquid pipe assembly. A paint gas separator connected to the paint storage tank is arranged on the top of the paint storage tank. The paint gas separator, paint storage tank, inverted circulation pump, vacuum machine, pressure pump, air pipe assembly, and liquid pipe assembly are connected through multiple valves. The liquid inlet and the liquid outlet are connected to the paint storage tank through the liquid pipe assembly, and the inner pool is connected to the paint gas separator through the air pipe assembly.

2. A pressure-flow immersion paint device according to claim 1, characterized in that: The multiple inner pools are arranged in sequence along a straight line, the transverse cross-section of the inner pool is a rectangular structure, the tops of the two side walls of the multiple inner pools are provided with gas escape channels, the multiple gas escape channels are on the same straight line, the height of the multiple inner pools is smaller than the height inside the paint immersion pool, and the axial cross-section of the bottom of the multiple inner pools is a V-shaped structure.

3. A pressure-flow immersion paint device according to claim 2, characterized in that: Strip interfaces are alternately arranged on both sides of two adjacent inner pools, and the interiors of the multiple inner pools are connected through the multiple strip interfaces to form a serpentine channel. The liquid inlet is connected to the strip interface of the inner pool near the left end of the paint immersion pool, and the liquid outlet is connected to the strip interface of the inner pool near the right end of the paint immersion pool. Pressure gauges for detecting the liquid inlet pressure and the liquid outlet pressure are provided at the liquid inlet and the liquid outlet.

4. A pressure-flow immersion paint device according to claim 1, characterized in that: The lifting assembly comprises: A support frame, wherein the transverse cross-section of the support frame is a rectangular structure, and the four corners of the bottom of the support frame are respectively fixedly connected to the top walls of the four lifting guide columns; Two support plates are provided, and the two support plates are cross-arranged inside the support frame, and the two ends of the two support plates are respectively fixedly connected to the four vertices inside the support frame; A driving motor, wherein the driving motor is arranged at the intersection of the two supporting plates, and a mounting end of the driving motor is fixedly connected to the top of the supporting plate; Rotating components, there are four rotating components, and the four rotating components are arranged on the top of the two supporting plates in a circular array with the driving motor as the center, and the four rotating components are respectively meshed and connected with the output ends of the driving motor.

5. A pressure-flow immersion paint device according to claim 4, characterized in that: The rotating assembly comprises: A rotating frame, one end of which is fixedly connected to the side wall of the driving motor, and the bottom of the other end of the rotating frame is fixedly connected to the top wall of the supporting plate through a plurality of supporting columns; A branch gear, wherein a plurality of branch gears are provided, and the plurality of branch gears are provided between the support plate and the rotating frame, the plurality of branch gears are meshed and connected in sequence along the length direction of the rotating frame, the top and bottom of the plurality of branch gears are rotatably connected to the bottom of the rotating frame and the top of the support plate respectively, and the branch gear close to the driving motor is meshed and connected to the output end of the driving motor; The main shaft gear is arranged on the side of the top of the support plate away from the driving motor, and the main shaft gear is arranged between the support plate and the rotating frame. The main shaft gear is meshed and connected with the branch gear close to the side of the main shaft gear. The output end of the driving motor can drive multiple branch gears to rotate, and multiple branch gears drive the main shaft gear to rotate.

6. A pressure-flow immersion paint device according to claim 5, characterized in that: The lifting assembly also includes a rotating column, which is provided with 4 rotating columns, and the 4 rotating columns respectively correspond to the 4 main shaft gears. The outer wall of the rotating column is provided with an external thread, and a rotating hole matching the rotating column is provided at the center of the main shaft gear. The inner wall of the rotating hole is provided with an internal thread matching the external thread of the rotating column. The rotating column is arranged at the bottom of the support frame, and the top of the rotating column passes through the support plate, the rotating hole and the rotating frame in sequence upward. A thrust bearing is arranged at the connection between the rotating column, the support plate and the rotating frame, and the rotating column is threadedly connected to the rotating hole. When the output end of the driving motor rotates, the 4 rotating columns can be driven to make vertical linear motion at the same time, and the bottoms of the 4 rotating columns are respectively fixedly connected to the top of the paint immersion pool cover.

7. The pressure-flow immersion paint device according to claim 1, characterized in that: The workpiece frame is a cubic structure frame, and the bottom of the workpiece frame is formed by a plurality of support rods arranged in a transverse interval to form a paint dipping rack, and the two ends of the plurality of support rods are respectively fixedly connected to the two side walls of the bottom of the workpiece frame, and a plurality of reinforcing ribs are arranged in an interval at the top of the workpiece frame, and vertical pulleys are respectively fixedly connected to the two sides of the top of the workpiece frame corresponding to the plurality of reinforcing ribs, and when the top of the workpiece frame is extended into the workpiece hanger hanging groove, it is slidably connected to the inner wall of the workpiece hanger hanging groove through the plurality of vertical pulleys, and a spring fixing pin is penetrated through the top of one end of the workpiece frame, and the outer diameter of the workpiece frame matches the inner diameter of the inner pool, and the workpiece frame is used to extend into the interior of the inner pool.

8. The pressure-flow immersion paint device according to claim 1, characterized in that: The trachea assembly comprises: a first ventilation pipe, one end of which passes through the paint immersion pool and the inner pool near one side of the first ventilation pipe in sequence, the first ventilation pipe is connected to the interior of the inner pool, the first ventilation pipe and the plurality of gas escape channels are in a straight line, and the pressure gauge is provided on the side of the first ventilation pipe near the paint immersion pool, a CF01 valve is provided on the first ventilation pipe on the left side of the pressure gauge, a CF03 valve is provided on the first ventilation pipe on the left side of the CF01 valve, and a CF07 valve is provided on the first ventilation pipe on the left side of the CF03 valve; a second ventilation pipe, the second ventilation pipe is arranged on the first ventilation pipe between the CF03 valve and the CF07 valve, one end of the second ventilation pipe is connected with the first ventilation pipe through the CF04 valve, the other end of the second ventilation pipe is connected with the first connecting port of the vacuum machine, the vacuum machine is fixedly connected to the ground, and a plurality of pressure gauges are arranged on the top of the vacuum machine; a third ventilation pipe, one end of which is connected to the second connection port of the vacuum machine through a CF08 valve, the other end of the first ventilation pipe is connected to the left side of the CF08 valve on the third ventilation pipe, a CF10 valve is provided on the left side of the first ventilation pipe on the third ventilation pipe, and the other end of the third ventilation pipe is connected to the paint gas separator; A hot air pipe, one end of which is arranged on the first ventilation pipe between the CF01 valve and the CF03 valve, one end of which is connected to the first ventilation pipe through the CF02 valve, and the other end of which is connected to a thermal energy device capable of generating hot air.

9. A pressure-flow immersion paint device according to claim 8, characterized in that: The liquid pipe assembly comprises: A first liquid pipe, one end of which is connected to the paint storage tank via an AF01 valve, an AF04 valve is provided on the first liquid pipe on the right side of the AF01 valve, the other end of which is connected to the liquid outlet via an AF07 valve, and a plurality of liquid inlet pipes with valves are provided on the paint storage tank; a second liquid pipe, one end of which is disposed on the first liquid pipe between the AF01 valve and the AF04 valve, the second liquid pipe is in communication with the first liquid pipe, the second liquid pipe is in communication with the inverted circulation pump, the second liquid pipe is provided with an AF05 valve on the right side of the inverted circulation pump, the second liquid pipe is provided with an AF06 valve on the right side of the AF05 valve, and the other end of the second liquid pipe is in communication with the liquid inlet; A third liquid pipe, one end of which is disposed on the first liquid pipe between the AF04 valve and the AF07 valve, one end of which is in communication with the first liquid pipe, and a BF02 valve is disposed on the third liquid pipe; a fourth liquid pipe, one end of the fourth liquid pipe is arranged on the second liquid pipe and is located between the first liquid pipe and the inverted circulation pump, one end of the fourth liquid pipe is connected to the second liquid pipe through a BF01 valve, the other end of the third liquid pipe is arranged on the fourth liquid pipe and is located on the right side of the BF01 valve, the other end of the third liquid pipe is connected to the fourth liquid pipe, a BF06 valve is arranged on the fourth liquid pipe and is located on the right side of the third liquid pipe, the other end of the fourth liquid pipe is connected to one side of the pressure pump, the other side of the pressure pump is connected to a fifth liquid pipe, and a BF07 valve is arranged on the fifth liquid pipe; a sixth liquid pipe, one end of which is disposed on the fourth liquid pipe and located between the third liquid pipe and the BF06 valve, one end of which is communicated with the fourth liquid pipe through the BF04 valve, the other end of which is disposed on the second liquid pipe and located between the AF05 valve and the AF06 valve, the other end of which is communicated with the second liquid pipe through the BF03 valve; a seventh liquid pipe, one end of the seventh liquid pipe is arranged on the sixth liquid pipe and is located between the BF04 valve and the BF03 valve, one end of the seventh liquid pipe is communicated with the sixth liquid pipe through a BF05 valve, a BF08 valve is arranged on the seventh liquid pipe and is located on the right side of the BF05 valve, the right end of the BF08 valve is communicated with one end of a downwardly curved insulation pipe, and a BF09 valve is arranged on the other end of the downwardly curved insulation pipe, one end of the fifth liquid pipe away from the pressure pump is arranged on the seventh liquid pipe and is located between the BF05 valve and the BF08 valve, one end of the fifth liquid pipe away from the pressure pump is communicated with the seventh liquid pipe, the bent end of the downwardly curved insulation pipe is communicated with a fourth ventilation pipe through a CF05 valve, and one end of the fourth ventilation pipe away from the downwardly curved insulation pipe is communicated with a third connecting port of the vacuum machine through a CF06 valve; A main half-moon tube, the main half-moon tube is arranged inside the paint immersion pool, the main half-moon tube penetrates multiple inner pools, the main half-moon tube coincides with the axis lines of the multiple inner pools, a plurality of first scattering holes are arranged at intervals on the top of the main half-moon tube, a plurality of pool concave paint extraction holes are arranged at intervals on the bottom of the two side walls of the main half-moon tube, one end of the main half-moon tube close to the vacuum machine penetrates the inner pool and the paint immersion pool and extends to the outside of the paint immersion pool, and the pressure gauge is arranged on one end of the main half-moon tube close to the vacuum machine; A plurality of branch and trunk semi-lunar tubes are provided, and the plurality of branch and trunk semi-lunar tubes are respectively provided corresponding to the plurality of inner pools, the plurality of branch and trunk semi-lunar tubes are provided perpendicular to the main trunk semi-lunar tube, the bottom walls of the plurality of branch and trunk semi-lunar tubes are respectively connected to the bottoms of the plurality of inner pools, the tops of the branch and trunk semi-lunar tubes are provided with a plurality of second scattering holes arranged at intervals, and the plurality of branch and trunk semi-lunar tubes are all connected to the main trunk semi-lunar tube; an eighth liquid pipe, one end of the eighth liquid pipe being connected with one end of the main half-moon pipe close to the vacuum machine through a BF10 valve, a BF12 valve being arranged on the eighth liquid pipe on the left side of the BF10 valve, a BF11 valve being arranged on the eighth liquid pipe on the left side of the BF12 valve, the other end of the eighth liquid pipe being connected with a thermal energy device capable of generating hot gas, an end of the seventh liquid pipe close to the eighth liquid pipe being arranged on the eighth liquid pipe between the BF10 valve and the BF12 valve, and an end of the seventh liquid pipe close to the eighth liquid pipe being connected with the eighth liquid pipe.

10. The pressure-flow immersion paint device according to claim 8, characterized in that: The paint gas separator comprises: A pipe body, the bottom of which is connected and communicated with the top of the paint storage tank, a paint gas inlet is provided at the top of the side wall of the pipe body, the paint gas inlet is communicated with the third ventilation pipe, the pressure gauge is provided at the top of the pipe body, and an exhaust pipe communicated with the inside of the pipe body is provided at the top of the other side of the pipe body; A plurality of vertical plates are provided, and the plurality of vertical plates are arranged in a circular array inside the tube body with the center of the tube body as the axis, and one end of the plurality of vertical plates close to the side wall of the tube body is fixedly connected to the inner wall of the tube body, and a plurality of paint liquid flow components are arranged axially at intervals between the plurality of vertical plates, and the plurality of paint liquid flow components are arranged below the paint gas inlet and the exhaust pipe.

11. A pressure-flow immersion paint device according to claim 10, characterized in that: The paint liquid flow component comprises: An upper template, the upper template is a shell with an opening at the bottom and an upward protrusion at the axis, the outer diameter of the upper template is smaller than the inner diameter of the tube body, the side walls of the upper template are respectively fixedly connected to the sides of the plurality of vertical plates away from the inner wall of the tube body, and a paint liquid flow port is formed between the upper template and the inner wall of the tube body; The lower template is a funnel with a top opening larger than a bottom opening. The lower template is arranged at the bottom of the upper template. The outer diameter of the lower template matches the inner diameter of the tube body. The side wall of the lower template passes through multiple vertical plates and is sealed and connected to the side wall of the tube body.

12. A pressure flow immersion coating method, characterized in that: A pressure-flow immersion paint device according to any one of claims 1 to 11, comprising the following steps: S1. In the initial stage, multiple workpiece frames with workpieces are loaded into the inner pool respectively, and the cover plate of the immersion pool is pressed to the top of the immersion pool by the rotating column, and the AF01 valve, AF05 valve, AF06 valve, AF07 valve and CF01 valve, CF03 valve, CF07 valve, CF10 valve are opened, and the motor of the reverse circulation pump is started to rotate forward. At this time, the paint liquid in the paint storage tank is extracted to transport the paint liquid to the inner pool until the pool is full, and the air in the inner pool enters the paint gas separator on the top of the paint storage tank through the gas escape channel, the first ventilation pipe and the second ventilation pipe. The pressure gauge on the first ventilation pipe and the pressure gauge on the paint gas separator display the paint liquid pressure value to determine whether the air at the bottom of the immersion pool cover is emptied; when it is necessary to speed up the speed of the paint liquid flowing into the inner pool, the BF01 valve, BF06 valve, BF07 valve, BF08 valve, BF09 valve, BF10 valve can be opened, and the pressure pump can be started to scatter the paint flow to the inner pool through the main semi-lunar pipe and the branch semi-lunar pipe; S2. Confirm that the working status after the inner pool is filled with paint liquid includes: In the pressure flow state, open the AF04 valve, and the paint liquid in the liquid pipe and the inner pool will perform pressure flow circulation. In the pressure flow circulation state, open the BF01 valve or close the BF01 valve and open the BF02 valve, BF06 valve, pressure pump, BF07 valve, BF08 valve, BF09 valve, and BF10 valve to scatter the paint flow into the inner pool through the main half-moon pipe; Static pressure state, after the inner pool is filled with paint liquid, close all valves and pumps. At this time, the inner pool is in a static pressure state, and the static pressure is atmospheric pressure. Or open the AF01 valve, BF06 valve, BF07 valve, BF08 valve, BF09 valve, BF10 valve, and start the pressure pump to add paint liquid to the closed inner pool and increase the pressure; In the vacuum state, after the inner pool is filled with paint liquid, close all valves and pumps. Under the static pressure state of the inner pool, open the CF01 valve, CF03 valve, CF04 valve, CF08 valve, and CF10 valve, and start the vacuum machine to vacuum the inner pool; S3. The paint liquid is pumped back to the paint storage tank, and all valves and pumps are closed. Only the AF01 valve, AF05 valve, AF06 valve, AF07 valve, BF02 valve, BF04 valve, BF03 valve, BF05 valve, BF08 valve, BF09 valve, BF10 valve, CF01 valve, CF03 valve, CF07 valve, and CF10 valve are opened. The motor of the inverted circulation pump is started to rotate in the reverse direction. When the paint liquid in the inner pool is emptied, the AF01 valve, the inverted circulation pump, the AF05 valve, the CF05 valve, and the CF06 valve are opened. The vacuum machine is started to pump out the remaining paint at the bottom of the inner pool and in the pipe valve, and then the vacuum machine is closed and all valves are closed. S4, drying, open the CF01 valve, CF02 valve, BF10 valve, BF11 valve, BF12 valve, hot air circulates in the closed inner pool, and the drying is divided into two operating states: one is to preheat the unpainted workpiece; The second is to heat and dry the paint film on the surface of the paint-impregnated workpiece.

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