Automatic powder supplementing device and system for electrostatic spraying of aluminum profile surface

Abstract

The application discloses an automatic powder supplementing device and system for electrostatic spraying on the surface of aluminum profiles, which comprises a powder supplementing tank assembly, a gas supply center, a control valve group, a powder supply center, a filter and a powder feeding pump, two control valve groups are in conductive connection with the output end of the gas supply center, the output end of each of the two control valve groups is in conductive connection with the powder supplementing tank assembly, and the output end of the powder supply center is in conductive connection with the input end of one of the powder supplementing tank assemblies; the application adopts the technology of double-tank differential pressure synchronous pre-fluidization combined with flow balance continuous powder supplementing to avoid the problem of powder output fluctuation caused by online powder supplementing; a three-cavity gradient fluidization structure is adopted to form a uniform fluidization field with weak center and strong periphery, and the uniformity of fluidization is significantly improved; a split-type air cap assembly is additionally arranged on the fluidization plate, which can be processed independently, and the processing difficulty is greatly reduced; the air cap assembly is integrated with an automatic dredging function, and the air cap can be cleaned without disassembly, so that the maintenance time is greatly shortened, and the equipment operation and maintenance cost is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of electrostatic spraying equipment technology, specifically to an automatic powder replenishment device and system for electrostatic spraying of aluminum profile surfaces. Background Technology

[0002] Electrostatic powder coating of aluminum profiles is one of the most widely used surface treatment technologies in industries such as construction, automobiles, and home appliances. The powder replenishment device is a core component, directly determining the stability of the coating quality and production efficiency. Existing powder replenishment devices have the following drawbacks: 1. Existing powder replenishment devices generally adopt a liquid level triggering combined with online one-time large-volume powder replenishment. When the liquid level in the powder supply tank falls below a set threshold, new powder is rapidly injected into the tank, instantly disrupting the uniformity of the fluidized bed and causing greater fluctuations in powder output, leading to coating defects on the aluminum profile surface. If a shutdown powder replenishment method is used to avoid quality problems, production will be frequently interrupted, significantly reducing production efficiency and making it difficult to meet the needs of continuous large-scale production; 2. Existing powder replenishment devices generally use an integrated fluidized plate combined with a single air intake method, leading to… 1. The fluidization intensity in the central area is too high, resulting in severe powder splashing, while the fluidization intensity in the surrounding and corner areas of the barrel is insufficient, forming a fluidization dead zone and causing uneven powder fluidization; 2. In order to reduce the blockage of the air outlet of the fluidizing plate, the existing technology mostly stamps a fish scale-like protrusion structure on the surface of the fluidizing plate and opens the air outlet on its side, but this structure is difficult to process, has a long production cycle, and high manufacturing cost; 3. Existing fluidizing plates generally lack an online unblocking structure. Once the air outlet is blocked by powder, the machine must be stopped and the fluidizing plate must be disassembled for manual unblocking. This not only involves a large amount of maintenance work and is time-consuming, but also further affects the continuity of production. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic powder replenishment device and system for electrostatic spraying of aluminum profiles, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an automatic powder replenishment device for electrostatic spraying of aluminum profiles, comprising a powder replenishment tank assembly, an air supply center, a control valve group, a powder supply center, a filter, and a powder delivery pump. The output end of the air supply center is conductively connected to two control valve groups, the output ends of both control valve groups are conductively connected to the powder replenishment tank assembly, and the output end of the powder supply center is conductively connected to the input end of one of the powder replenishment tank assemblies. The output end of the powder replenishment tank assembly is conductively connected to the input end of the powder delivery pump, and the output end of the powder delivery pump is conductively connected to the input end of the other powder replenishment tank assembly. The powder replenishment tank assembly includes a tank body, an air outlet pipe is conductively fixed on the upper surface of the tank body, and the input end of the filter is conductively connected to the output end of the air outlet pipe. A base is conductively fixed on the lower surface of the tank body, a first air cavity is provided on the base, a second air cavity is provided outside the first air cavity, and a third air cavity is provided outside the second air cavity. An air inlet pipe is conductively fixed on the third air cavity, the second air cavity, and the first air cavity, and the input end of the air inlet pipe is conductively connected to the output end of the control valve group.

[0005] A flow equalization plate is slidably connected inside the base. Multiple first air outlet holes are opened on the flow equalization plate. A concentric isolation sleeve is fixedly connected to the lower surface of the flow equalization plate, and the concentric isolation sleeve is slidably connected to the inner wall of the third air cavity, the second air cavity and the first air cavity.

[0006] Multiple discharge pipes are fixed through the upper surface of the tank at the position corresponding to the second air chamber, and multiple feed pipes are connected to the tank along the circumferential tangential direction.

[0007] A fixed frame is fixedly connected inside the first air cavity, and an electric push rod is fixedly connected on the fixed frame. The output end of the electric push rod is fixedly connected to the lower surface of the flow equalization plate.

[0008] The top of the flow equalization plate is provided with a fluidizing plate, which is fixedly connected to the base. The fluidizing plate has multiple mounting holes evenly distributed, and a wind cap assembly is installed in the mounting holes. The wind cap assembly includes a sleeve, a wind cap body, a second air outlet, a guide groove, a deformation groove, a limiting block, an elastic rod, a first bending rod, a second bending rod, a connecting ring, and a spring. The sleeve is fitted into the mounting hole, and the top of the sleeve is conductively fixed to the wind cap body. Multiple second air outlets are evenly distributed on the wind cap body, and the second air outlets are conductively connected to the sleeve. Two limiting blocks are fixedly connected to the bottom of the sleeve, and the limiting blocks are located at the bottom of the fluidizing plate.

[0009] The bottom end of the sleeve has two deformation grooves, and the deformation grooves are spaced apart from the limiting block.

[0010] A guide groove is provided inside the sleeve at the position corresponding to the second air outlet. An elastic rod is slidably connected inside the guide groove. A first bending rod is fixedly connected to the bottom end of the elastic rod and is located at the top of the limiting block. A second bending rod is fixedly connected to the other end of the first bending rod. A connecting ring is provided at the top of the flow equalizer at the position corresponding to the mounting hole, and the second bending rod is fixedly connected to the connecting ring. A spring is sleeved on the second bending rod, with one end of the spring located on the connecting ring and the other end located on the limiting block.

[0011] An automatic powder replenishment system for electrostatic spraying of aluminum profiles includes a data acquisition module, a main control module, and a human-machine interaction module. The main control module establishes data connections with the data acquisition module and the human-machine interaction module respectively. The data acquisition module is installed on the powder replenishment tank assembly. The main control module establishes electrical connections with the electric push rod, the control valve group, and the powder delivery pump.

[0012] The data acquisition module includes a fluidization pressure difference detection unit, a flow rate detection unit, and a liquid level detection unit. The fluidization pressure difference detection unit is used to detect the fluidization pressure difference in the two powder replenishment tank assemblies. The flow rate detection unit is used to detect the inlet and outlet powder flow rates of the two powder replenishment tank assemblies. The liquid level detection unit is used to detect the fluidized powder liquid level in the two powder replenishment tank assemblies.

[0013] The main control module includes a data processing unit, an execution unit, and a data storage unit. The data processing unit is used to process the collected data and issue control commands, the execution unit is used to execute the control commands, and the data storage unit is used to store the data.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention avoids the problem of powder output fluctuation caused by online powder replenishment by using dual-tank differential pressure synchronous pre-fluidization combined with flow balance continuous powder replenishment technology; adopts a three-chamber gradient fluidization structure to form a uniform fluidization field with a weak center and a strong periphery, which significantly improves the fluidization uniformity; a split-type air cap assembly is added to the fluidization plate, which can be processed independently, greatly reducing the processing difficulty; the air cap assembly integrates an automatic unblocking function, which can complete the air cap unblocking without disassembly, greatly shortening the maintenance time and significantly reducing the equipment operation and maintenance cost. Attached Figure Description

[0015] Figure 1 This is a block diagram of the device structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the powder replenishing tank assembly of the present invention; Figure 3 This is a schematic diagram of the front sectional view of the powder replenishing tank assembly of the present invention; Figure 4 for Figure 3 Enlarged view of the structure of region A in the middle; Figure 5 This is a three-dimensional structural diagram of the wind cap assembly of the present invention; Figure 6 This is a schematic diagram of the three-dimensional cross-sectional structure of the base of the present invention; Figure 7 This is a system structure block diagram of the present invention.

[0016] In the diagram: 1. Powder replenishment tank assembly; 11. Tank body; 12. Feed pipe; 13. Air outlet pipe; 14. Discharge pipe; 15. Base; 16. First air chamber; 17. Second air chamber; 18. Third air chamber; 19. Air inlet pipe; 110. Fixing frame; 111. Electric push rod; 112. Flow equalization plate; 113. First air outlet; 114. Concentric isolation sleeve; 115. Fluidizing plate; 116. Mounting hole; 2. Air cap assembly; 21. Sleeve; 22. Air cap body; 23. Second air outlet; 24. Guide groove 25. Deformation groove; 26. Limiting block; 27. Elastic rod; 28. First bending rod; 29. ​​Second bending rod; 210. Connecting ring; 211. Spring; 3. Air supply center; 4. Control valve group; 5. Powder supply center; 6. Filter; 7. Powder pump; 8. Data acquisition module; 81. Fluidization differential pressure detection unit; 82. Flow detection unit; 83. Liquid level detection unit; 9. Main control module; 91. Data processing unit; 92. Execution unit; 93. Data storage unit; 10. Human-machine interaction module. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see the appendix Figure 1 - Appendix Figure 6This invention provides an embodiment of an automatic powder replenishment device for electrostatic spraying of aluminum profiles, comprising a powder replenishment tank assembly 1, an air supply center 3, a control valve group 4, a powder supply center 5, a filter 6, and a powder delivery pump 7. The output end of the air supply center 3 is conductively connected to two control valve groups 4, the output ends of which are both conductively connected to the powder replenishment tank assembly 1. The output end of the powder supply center 5 is conductively connected to the input end of one of the powder replenishment tank assemblies 1, the output end of which is conductively connected to the input end of the powder delivery pump 7. The output end of the powder delivery pump 7 is conductively connected to the input end of the other powder replenishment tank assembly 1. The powder replenishment tank assembly 1 includes a tank body 11, with an air outlet pipe 13 conductively fixed to the upper surface of the tank body 11, and the input end of the filter 6 is conductively connected to... Connected to the output end of the air outlet duct 13, a base 15 is fixedly connected to the lower surface of the tank body 11. A first air chamber 16 is provided on the base 15, a second air chamber 17 is provided outside the first air chamber 16, and a third air chamber 18 is provided outside the second air chamber 17. An air inlet pipe 19 is fixedly connected to the third air chamber 18, the second air chamber 17, and the first air chamber 16, and the input end of the air inlet pipe 19 is connected to the output end of the control valve group 4. The powder supply tank assembly 1 connected to the powder supply center 5 serves as the pre-fluidization tank, and another powder supply tank assembly 1 serves as the spray gun powder supply tank. The powder supply center 5 provides powder raw materials to the pre-fluidization tank, and the pre-fluidization tank sends the pre-fluidized powder into the spray gun powder supply tank. The air supply center 3 supplies powder to the two powder supply tanks through the control valve group 4. The tank assembly 1 provides compressed air. The air outlet 13 discharges air from the tank 11 into the filter 6, which filters the powder. The base 15 delivers compressed air to the first air chamber 16, the second air chamber 17, and the third air chamber 18 via the air inlet 19. The compressed air from the three air chambers forms a gradient fluidization field within the tank 11, weak at the center and strong at the periphery, thereby fluidizing the powder. A flow equalizer 112 is slidably connected inside the base 15. The flow equalizer 112 has multiple first air outlets 113. A concentric isolation sleeve 114 is fixedly connected to the lower surface of the flow equalizer 112, and the concentric isolation sleeve 114 is slidably connected to the inner walls of the third air chamber 18, the second air chamber 17, and the first air chamber 16. The flow equalizer 112... Compressed air is evenly discharged through the first air outlet 113. The concentric isolation sleeve 114 is used to maintain the isolation of each air cavity during the movement of the flow equalizer 112. Multiple discharge pipes 14 are fixedly installed through the upper surface of the tank body 11 at the position corresponding to the second air cavity 17. Multiple feed pipes 12 are connected to the tank body 11 along the circumferential tangent direction. The discharge pipes 14 are used to output powder, and the feed pipes 12 are used to input powder. A fixed frame 110 is fixedly connected inside the first air cavity 16. An electric push rod 111 is fixedly connected to the fixed frame 110. The output end of the electric push rod 111 is fixedly connected to the lower surface of the flow equalizer 112. The fixed frame 110 is used to install the electric push rod 111, and the electric push rod 111 is used to drive the flow equalizer 112.A fluidizing plate 115 is provided at the top of the flow equalization plate 112, and the fluidizing plate 115 is fixedly connected to the base 15. Multiple mounting holes 116 are evenly distributed on the fluidizing plate 115. A wind cap assembly 2 is installed in the mounting holes 116. The wind cap assembly 2 includes a sleeve 21, a wind cap body 22, a second air outlet 23, a guide groove 24, a deformation groove 25, a limiting block 26, an elastic rod 27, a first bending rod 28, a second bending rod 29, a connecting ring 210, and a spring 211. The sleeve 21 is sleeved in the mounting hole 116, and the top of the sleeve 21 is conductively fixed. The device includes a hood body 22 with multiple second air outlets 23 evenly distributed on it. These second air outlets 23 are connected to a sleeve 21. Two limiting blocks 26 are fixedly connected to the bottom of the sleeve 21, and these limiting blocks 26 are positioned at the bottom of a fluidizing plate 115. The fluidizing plate 115 is fitted with the hood assembly 2 via mounting holes 116. The sleeve 21 and the second air outlets 23 form a gas flow channel. The limiting blocks 26, in conjunction with the hood body 22, confine the sleeve 21 within the mounting holes 116. Two deformation grooves 25 are formed at the bottom of the sleeve 21. 5 is spaced apart from the limiting block 26. The deformation groove 25 is used to provide space for the deformation of the end of the sleeve 21. A guide groove 24 is opened in the sleeve 21 at the position corresponding to the second air outlet 23. An elastic rod 27 is slidably connected in the guide groove 24. A first bending rod 28 is fixedly connected to the bottom end of the elastic rod 27. The first bending rod 28 is set at the top of the limiting block 26. A second bending rod 29 is fixedly connected to the other end of the first bending rod 28. A connecting ring 210 is set at the top of the flow equalizing plate 112 at the position corresponding to the mounting hole 116. The second bending rod 29 is also fixedly connected to the second bending rod 29. 9 is fixedly connected to the connecting ring 210. A spring 211 is sleeved on the second bent rod 29, with one end of the spring 211 set on the connecting ring 210 and the other end set on the limiting block 26. The guide groove 24 is used to guide the elastic rod 27, which is used to clear the second air outlet 23. The first bent rod 28 is used to cooperate with the limiting block 26 to limit the downward movement of the elastic rod 27. The second bent rod 29 is used to connect the first bent rod 28 and the connecting ring 210. The spring 211 is used to provide a restoring force for the connecting ring 210.

[0019] Please see the appendix Figure 7This invention provides an embodiment of an automatic powder replenishment system for electrostatic spraying of aluminum profiles, comprising a data acquisition module 8, a main control module 9, and a human-machine interface module 10. The main control module 9 establishes data connections with both the data acquisition module 8 and the human-machine interface module 10. The data acquisition module 8 is mounted on the powder replenishment tank assembly 1. The main control module 9 establishes electrical connections with an electric push rod 111, a control valve group 4, and a powder delivery pump 7. The data acquisition module 8 is used for data acquisition, the main control module 9 is used for data processing, and the human-machine interface module 10 is used for data visualization and control command input. The data acquisition module 8 includes fluidization pressure differential. The system includes a detection unit 81, a flow detection unit 82, and a level detection unit 83. The fluidized pressure differential detection unit 81 is used to detect the fluidized pressure differential within the two powder replenishment tank assemblies 1. The flow detection unit 82 is used to detect the inlet and outlet powder flow rates of the two powder replenishment tank assemblies 1. The level detection unit 83 is used to detect the fluidized powder level within the two powder replenishment tank assemblies 1. The main control module 9 includes a data processing unit 91, an execution unit 92, and a data storage unit 93. The data processing unit 91 is used to process the collected data and issue control commands. The execution unit 92 is used to execute the control commands. The data storage unit 93 is used to store the data.

[0020] Working Principle: When using this invention, the powder replenishment tank assembly 1 connected to the powder supply center 5 is used as the pre-fluidization tank, and another powder replenishment tank assembly 1 is used as the spray gun powder supply tank. The fluidization pressure difference detection unit 81 in the data acquisition module 8 detects the fluidization pressure difference between the pre-fluidization tank and the spray gun powder supply tank respectively. The data processing unit 91 of the main control module 9 uses the fluidization pressure difference of the spray gun powder supply tank as the reference value and sends a command to the execution unit 92. The execution unit 92 automatically adjusts the air intake of the pre-fluidization tank, that is, adjusts the opening of the control valve group 4 connected to the pre-fluidization tank, so that the pre-fluidization tank... The fluidization pressure difference between the fluidizing tank and the powder supply tank of the spray gun is equal to ensure that the powder fluidization state is consistent, eliminating the impact of powder replenishment at the source. The flow detection unit 82 detects the inlet and outlet flow rates of the two powder supply tank components 1, namely the flow rates of the inlet pipe 12 and the outlet pipe 14. The data processing unit 91 issues instructions to the execution unit 92 based on the flow data, thereby controlling the powder supply amount of the powder supply center 5 and the powder delivery pump 7, so that the inlet and outlet flow rates of the two powder supply tank components 1 reach dynamic balance, eliminating the drawbacks of intermittent powder replenishment. At the same time, the liquid level detection unit 83 collects data in real time. The fluidized powder level is fed to the data processing unit 91, which compares it with a set value and calculates the level deviation. When the level deviation exceeds a threshold, the powder inlet flow rate set value is fine-tuned until the level deviation is within the threshold range, thereby eliminating the cumulative error of flow measurement and ensuring that the level remains stable at the set value for a long time. The data storage unit 93 stores the data, and the human-machine interface module 10 is used to visualize the data and input control commands. When the powder replenishment tank assembly 1 fluidizes the powder, compressed air passes through the base 15. The air inlet pipe 19 on the top enters the corresponding first air chamber 16, second air chamber 17 and third air chamber 18 respectively. The compressed air is evenly discharged through the first air outlet 113 on the flow equalization plate 112, and then enters the air cap assembly 2 on the fluidization plate 115. It is discharged from the air cap assembly 2 into the tank 11 to fluidize the powder in the tank 11. In the air cap assembly 2, the compressed air enters the second air outlet 23 on the air cap body 22 through the sleeve 21. The second air outlet 23 is set to be inclined upward and the output end is located on the side wall of the air cap body 22.When installing the hood assembly 2, the sleeve 21 is inserted into the mounting hole 116. The limiting block 26, in conjunction with the hood body 22, restricts the sleeve 21 within the mounting hole 116. During this process, the deformation groove 25 provides space for the deformation of the sleeve 21. When the second air outlet 23 becomes blocked, simply activate the electric push rod 111 on the fixing bracket 110. The electric push rod 111 drives the flow equalizing plate 112 upward, which pushes the connecting ring 210 upward. The connecting ring 210 compresses the spring 211. The connecting ring 210 drives the first bending rod 28 via the second bending rod 29. The elastic rod 27 on the first bending rod 28 moves upward along the guide groove 24 and enters the second air outlet 23 to clear the blockage. Then, the electric push rod 111 drives the flow equalizing plate 112 downward to reset. Under the action of the spring 211... The connecting ring 210 moves down to reset, causing the elastic rod 27 to also reset, until the first bending rod 28 is blocked by the limiting block 26; wherein, the air supply center 3 is used to provide dry and clean compressed air to the control valve group 4, the air outlet pipe 13 is used to discharge the air in the tank 11 into the filter 6, the filter 6 is used to filter the powder carried by the air, and the concentric isolation sleeve 114 is used to maintain the isolation of each air cavity during the movement of the flow equalization plate 112; the compressed air blown out by the first air cavity 16, the second air cavity 17 and the third air cavity 18 forms a gradient fluidization field with a weak center and a strong periphery in the tank 11. The air pressure in the first air cavity 16 is lower than that in the second air cavity 17, and the air pressure in the second air cavity 17 is lower than that in the third air cavity 18. The differentiated air intake pressure makes the powder fluidization intensity in the tank 11 uniform.

[0021] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic powder replenishment device for electrostatic spraying of aluminum profiles, comprising a powder replenishment tank assembly (1), an air supply center (3), a control valve group (4), a powder supply center (5), a filter (6), and a powder delivery pump (7), characterized in that: The output end of the air supply center (3) is connected to two control valve groups (4), and the output ends of both control valve groups (4) are connected to powder replenishment tank assemblies (1). The output end of the powder supply center (5) is connected to the input end of one of the powder replenishment tank assemblies (1). The output end of the powder replenishment tank assembly (1) is connected to the input end of the powder delivery pump (7), and the output end of the powder delivery pump (7) is connected to the input end of the other powder replenishment tank assembly (1). The powder replenishment tank assembly (1) includes a tank body (11), and an air outlet pipe (13) is fixedly connected to the upper surface of the tank body (11). The filter (6) input end is connected to the output end of the air outlet pipe (13), and the tank (11) is connected to the base (15) on the lower surface. The base (15) has a first air chamber (16), the second air chamber (17) is provided outside the first air chamber (16), and the third air chamber (18) is provided outside the second air chamber (17). The third air chamber (18), the second air chamber (17) and the first air chamber (16) are all connected to the air inlet pipe (19), and the input end of the air inlet pipe (19) is connected to the output end of the control valve group (4).

2. The automatic powder replenishment device for electrostatic spraying of aluminum profiles according to claim 1, characterized in that: A flow equalization plate (112) is slidably connected inside the base (15). Multiple first air outlet holes (113) are opened on the flow equalization plate (112). A concentric isolation sleeve (114) is fixedly connected to the lower surface of the flow equalization plate (112), and the concentric isolation sleeve (114) is slidably connected to the inner wall of the third air cavity (18), the second air cavity (17) and the first air cavity (16).

3. The automatic powder replenishing device for electrostatic spraying of aluminum profiles according to claim 1, characterized in that: Multiple discharge pipes (14) are fixed through the upper surface of the tank (11) at the position corresponding to the second air chamber (17), and multiple feed pipes (12) are connected to the tank (11) along the circumferential tangent direction.

4. The automatic powder replenishment device for electrostatic spraying of aluminum profiles according to claim 3, characterized in that: A fixed frame (110) is fixedly connected inside the first air cavity (16), and an electric push rod (111) is fixedly connected on the fixed frame (110). The output end of the electric push rod (111) is fixedly connected to the lower surface of the flow equalization plate (112).

5. An automatic powder replenishing device for electrostatic spraying of aluminum profiles according to claim 4, characterized in that: The top of the flow equalization plate (112) is provided with a fluidizing plate (115), and the fluidizing plate (115) is fixedly connected to the base (15). Multiple mounting holes (116) are evenly distributed on the fluidizing plate (115). A wind cap assembly (2) is installed in the mounting holes (116). The wind cap assembly (2) includes a sleeve (21), a wind cap body (22), a second air outlet (23), a guide groove (24), a deformation groove (25), a limiting block (26), an elastic rod (27), and a first bending rod (28). 8) The second bending rod (29), the connecting ring (210) and the spring (211) are fitted into the mounting hole (116). The top of the sleeve (21) is fixedly connected to the wind cap body (22). Multiple second air outlet holes (23) are evenly distributed on the wind cap body (22). The second air outlet holes (23) are connected to the sleeve (21). Two limiting blocks (26) are fixedly connected to the bottom of the sleeve (21). The limiting blocks (26) are set at the bottom of the fluidizing plate (115).

6. The automatic powder replenishment device for electrostatic spraying of aluminum profiles according to claim 5, characterized in that: The sleeve (21) has two deformation grooves (25) at its bottom end, and the deformation grooves (25) and the limiting block (26) are spaced apart.

7. An automatic powder replenishing device for electrostatic spraying of aluminum profiles according to claim 5, characterized in that: A guide groove (24) is provided inside the sleeve (21) at the position corresponding to the second air outlet (23). An elastic rod (27) is slidably connected inside the guide groove (24). A first bending rod (28) is fixedly connected to the bottom end of the elastic rod (27), and the first bending rod (28) is set at the top of the limiting block (26). A second bending rod (29) is fixedly connected to the other end of the first bending rod (28). A connecting ring (210) is provided at the top of the flow equalizing plate (112) at the position corresponding to the mounting hole (116), and the second bending rod (29) is fixedly connected to the connecting ring (210). A spring (211) is sleeved on the second bending rod (29), and one end of the spring (211) is set on the connecting ring (210), and the other end is set on the limiting block (26).

8. An automatic powder replenishment system for electrostatic spraying of aluminum profiles, comprising a data acquisition module (8), a main control module (9), and a human-machine interaction module (10), characterized in that: The main control module (9) establishes data connections with the data acquisition module (8) and the human-machine interaction module (10) respectively. The data acquisition module (8) is installed on the powder replenishment tank assembly (1). The main control module (9) establishes electrical connections with the electric push rod (111), the control valve group (4) and the powder delivery pump (7).

9. An automatic powder replenishment system for electrostatic spraying of aluminum profiles according to claim 8, characterized in that: The data acquisition module (8) includes a fluidization pressure difference detection unit (81), a flow rate detection unit (82), and a liquid level detection unit (83). The fluidization pressure difference detection unit (81) is used to detect the fluidization pressure difference in the two powder replenishment tank assemblies (1). The flow rate detection unit (82) is used to detect the inlet and outlet flow rates of the two powder replenishment tank assemblies (1). The liquid level detection unit (83) is used to detect the fluidized powder liquid level in the two powder replenishment tank assemblies (1).

10. An automatic powder replenishment system for electrostatic spraying of aluminum profiles according to claim 8, characterized in that: The main control module (9) includes a data processing unit (91), an execution unit (92), and a data storage unit (93). The data processing unit (91) is used to process the collected data and issue control commands. The execution unit (92) is used to execute the control commands. The data storage unit (93) is used to store the data.

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