A powder supply system for an automatic spray gun

Abstract

The utility model discloses a powder supply system for automatic spray gun, including carrier, spray gun, powder supply device, powder pump, spray gun, powder supply device and powder pump are all installed in carrier, powder pump is connected with powder supply device and spray gun to supply powder to spray gun, and carrier can move spray gun, powder supply device and powder pump simultaneously to make spray gun, powder supply device and powder pump relatively stationary, and the powder supply length between spray gun and powder pump is less than 5.0 meters. The powder supply system provided by the utility model can shorten the powder supply length between spray gun and powder pump, is favorable to control powder pump energy consumption, improves powder pump conveying powder capacity, reduces component loss and guarantees production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of spraying equipment technology, and in particular to a powder supply system for an automatic spray gun. Background Technology

[0002] In existing electrostatic powder coating systems, the powder supply system for automatic spray guns typically consists of a powder supply device, a powder suction pipe, a Venturi powder pump, and a powder supply line. In traditional powder supply systems, the powder supply device is fixed to the ground and placed outside the spray booth. The Venturi powder pump is installed at the powder supply device. The Venturi powder pump draws powder from the powder supply device through the powder suction pipe and then supplies powder to the spray gun located inside the spray booth through the powder supply line. However, this traditional powder supply system has significant drawbacks: because the spray gun needs to be mounted on a carrier to move within a certain range, the length of the powder supply pipe is generally between 8 and 20 meters to meet the needs of the spray gun's movement. The large powder supply length between the Venturi powder pump and the spray gun significantly increases the resistance encountered when the mixture of powder and compressed air is conveyed to the spray gun. This directly leads to the Venturi powder pump requiring a larger compressed air flow to complete the powder delivery, increasing energy consumption. At the same time, the greater resistance also prevents the powder output from being effectively increased, seriously affecting the efficiency and effect of electrostatic powder coating. Furthermore, during long-term use, the higher air flow and pressure will exacerbate the wear and tear of related components, increasing the frequency of replacing various parts of the powder supply system, increasing equipment downtime, and causing a decrease in production efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a powder supply system for automatic spray guns, which can shorten the powder supply length between the spray gun and the powder pump, thereby helping to control the energy consumption of the powder pump, improve the powder conveying capacity of the powder pump, reduce component wear, and ensure production efficiency.

[0004] A powder supply system for an automatic spray gun according to a first aspect embodiment of the present invention includes a carrier, a spray gun, a powder supply device, and a powder pump. The spray gun, the powder supply device, and the powder pump are all mounted on the carrier. The powder pump is connected to the powder supply device and the spray gun to supply powder to the spray gun. The carrier is capable of simultaneously moving the spray gun, the powder supply device, and the powder pump so that the spray gun, the powder supply device, and the powder pump are relatively stationary. The powder supply length between the spray gun and the powder pump is less than 5.0 meters.

[0005] The powder supply system for automatic spray guns according to the embodiments of the present invention has at least the following beneficial effects: The powder supply system provided by the present invention, by installing the spray gun, powder supply device and powder pump on the carrier, allows the spray gun, powder supply device and powder pump to remain relatively stationary when the carrier moves the spray gun for spraying. As a result, the powder supply length between the spray gun and the powder pump can be less than 5.0 meters. Therefore, compared with the powder supply length between the spray gun and the powder pump in the prior art, the powder supply system provided by the present invention can shorten the powder supply length between the spray gun and the powder pump, thereby helping to control the energy consumption of the powder pump, improve the powder conveying capacity of the powder pump, reduce component wear and ensure production efficiency.

[0006] A powder supply system for an automatic spray gun according to a second aspect embodiment of the present invention includes a spray gun, a powder supply device, a powder pump, and a spray chamber. The powder pump is connected to the powder supply device and the spray gun to supply powder to the spray gun. The spray gun is located in the spray chamber. The powder supply device is fixedly installed inside or outside the spray chamber and close to the spray gun. The powder supply length between the spray gun and the powder pump is less than 5.0 meters. The spray gun is fixedly installed in the spray chamber, or the spray gun is installed on a carrier to move the spray gun via the carrier.

[0007] The powder supply system for automatic spray guns according to embodiments of the present invention has at least the following beneficial effects: In the powder supply system provided by the present invention, the spray gun can be fixedly installed in the spraying chamber or installed on the carrier. At the same time, by installing the powder supply device inside or outside the spraying chamber and close to the spray gun, the powder supply length between the spray gun and the powder pump can be less than 5.0 meters. Therefore, compared with the powder supply length between the spray gun and the powder pump in the prior art, the powder supply system provided by the present invention can shorten the powder supply length between the spray gun and the powder pump, thereby helping to control the energy consumption of the powder pump, improve the powder conveying capacity of the powder pump, reduce component wear, and ensure production efficiency.

[0008] According to some embodiments of this utility model, the spray gun and the powder pump are connected by a powder supply pipe, the length of which is 0.1 to 4.0 meters.

[0009] According to some embodiments of this utility model, the length of the powder supply pipe is 0.1 to 3.0 meters.

[0010] According to some embodiments of this utility model, the length of the powder supply pipe is 0.1 to 2.0 meters.

[0011] According to some embodiments of this utility model, the powder pump is directly connected to the tail of the spray gun, and the powder supply length between the spray gun and the powder pump is 0 to 0.15 meters.

[0012] According to some embodiments of the present invention, the carrier has at least one of a horizontal linear movement device, a vertical movement device, and an angle swing device, so that the carrier can drive the spray gun to move horizontally, vertically, or swing.

[0013] According to some embodiments of the present invention, it further includes a spraying chamber, wherein the carrier is at least partially located in the spraying chamber, the spray gun is located in the spraying chamber, and the powder supply device is located inside or outside the spraying chamber.

[0014] According to some embodiments of this utility model, it further includes a cyclone separator, a filter, and a powder transfer device. The top of the cyclone separator is connected to the bottom of the spraying chamber through a recovery pipe. The bottom of the cyclone separator is connected to the powder transfer device. The filter is connected to the air outlet of the cyclone separator. A first powder recovery device is provided at the bottom of the cyclone separator, and a second powder recovery device is provided at the bottom of the filter.

[0015] According to some embodiments of the present invention, the first powder recovery device is connected to a powder transfer device via a pipeline, the powder transfer device is located outside the spraying room and is connected to the powder supply device via a pipeline; or, the first powder recovery device integrates a powder conveying device to convey the recovered powder to the powder supply device, and the powder supply device is connected to a new powder adding device.

[0016] According to some embodiments of the present invention, a filter is also included, which is connected to the spray chamber and is used to extract and filter the air inside the spray chamber. A second powder recovery device is provided at the bottom of the filter.

[0017] According to some embodiments of the present invention, the second powder recovery device integrates a powder conveying device to convey the recovered powder to the powder supply device, and the powder supply device is connected to a new powder adding device; or, the second powder recovery device is connected to a powder transfer device, and the powder transfer device is connected to the powder supply device.

[0018] According to some embodiments of this utility model, the powder pump is a Venturi powder pump.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a schematic diagram of a powder supply system for an automatic spray gun according to some embodiments of the present invention; Figure 2 for Figure 1 A schematic diagram of a carrier for a powder supply system for an automatic spray gun is shown. Figure 3 This is a schematic diagram of a powder supply system for an automatic spray gun according to other embodiments of the present invention.

[0021] Figure label: The components include: a carrier 100, a spray gun 200, a powder supply device 300, a powder pump 400, a powder supply pipe 410, a spraying chamber 500, a powder transfer device 600, a cyclone separator 700, a recovery pipe 710, an air outlet 720, a first powder recovery device 730, a filter 800, and a second powder recovery device 810. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Reference Figure 1 and Figure 2According to some embodiments of the present invention, a powder supply system for an automatic spray gun 200 may include a carrier 100, a spray gun 200, a powder supply device 300, and a powder pump 400. The spray gun 200, the powder supply device 300, and the powder pump 400 are all mounted on the carrier 100. The powder pump 400 is connected to the powder supply device 300 and the spray gun 200 to supply powder to the spray gun 200. The carrier 100 can simultaneously move the spray gun 200, the powder supply device 300, and the powder pump 400 so that the spray gun 200, the powder supply device 300, and the powder pump 400 are relatively stationary. The powder supply length between the spray gun 200 and the powder pump 400 is less than 5.0 meters.

[0027] The powder supply system provided by this utility model, by installing the spray gun 200, powder supply device 300 and powder pump 400 on the carrier 100, allows the spray gun 200, powder supply device 300 and powder pump 400 to remain relatively stationary when the carrier 100 moves the spray gun 200 for spraying. As a result, the powder supply length between the spray gun 200 and the powder pump 400 can be less than 5.0 meters. Therefore, compared with the powder supply length between the spray gun 200 and the powder pump 400 in the prior art, the powder supply system provided by this utility model can shorten the powder supply length between the spray gun 200 and the powder pump 400, thereby helping to control the energy consumption of the powder pump 400, improve the powder conveying capacity of the powder pump 400, reduce component wear, and ensure production efficiency.

[0028] Reference Figure 1 In some embodiments, the powder supply system may further include a spray chamber 500, with the carrier 100 at least partially located within the spray chamber 500, the spray gun 200 located within the spray chamber 500, and the powder supply device 300 located inside or outside the spray chamber 500. Thus, the spray gun 200 performs spraying work within a dedicated spray chamber 500, effectively preventing powder from splashing everywhere.

[0029] Of course, in some other embodiments, the spray gun 200 may not need to work inside the spray chamber 500, in which case the spray chamber 500 may not need to be set up.

[0030] A powder supply system for an automatic spray gun 200, according to some embodiments of the present invention, may include a spray gun 200, a powder supply device 300, a powder pump 400, and a spray chamber 500. The powder pump 400 is connected to the powder supply device 300 and the spray gun 200 to supply powder to the spray gun 200, which is located inside the spray chamber 500. The powder supply device 300 is fixedly installed inside the spray chamber 500 and close to the spray gun 200, thereby the powder supply length between the spray gun 200 and the powder pump 400 can be less than 5.0 meters; alternatively, the powder supply device 300 may also be fixedly installed outside the spray chamber 500 and close to the spray gun 200, since the wall thickness of the spray chamber 500 is not too thick, and the powder supply length between the spray gun 200 and the powder pump 400 can still be less than 5.0 meters. In some embodiments, the spray gun 200 can be fixedly installed in the spray booth 500. Of course, in other embodiments, the spray gun 200 can also be installed on the carrier 100 so that the spray gun 200 can be moved by the carrier 100.

[0031] In practice, the powder supply device 300 can be fixedly installed on the inner or outer wall of the spray booth 500, or it can be fixedly installed on a bracket or other object.

[0032] In the powder supply system provided by this utility model, the spray gun 200 can be fixedly installed in the spraying chamber 500 or installed in the carrier 100. At the same time, by installing the powder supply device 300 inside or outside the spraying chamber 500 and close to the spray gun 200, the powder supply length between the spray gun 200 and the powder pump 400 can be less than 5.0 meters. Therefore, compared with the powder supply length between the spray gun 200 and the powder pump 400 in the prior art, the powder supply system provided by this utility model can shorten the powder supply length between the spray gun 200 and the powder pump 400, which is beneficial to control the energy consumption of the powder pump 400, improve the powder conveying capacity of the powder pump 400, reduce component wear, and ensure production efficiency.

[0033] In practical implementation, multiple spray guns 200 can be arranged in a straight line. With the powder supply device 300 fixedly installed, it can be positioned at the center of the multiple spray guns 200, and the powder pump 400 fixed to the powder supply device 300. This makes it easier to control the powder supply length between each spray gun 200 and the powder pump 400. By setting multiple spray guns 200, the working range required by a single spray gun 200 can be reduced, thereby shortening the powder supply length between the spray gun 200 and the powder pump 400.

[0034] The following is a table showing the actual maximum powder output of the spray gun under the same equipment conditions and different powder supply lengths (from the powder pump to the spray gun):

[0035] It should be noted that due to different powders, different brands and models of powder pumps, etc., the powder output will vary to varying degrees, so the above data is for reference only.

[0036] Therefore, the shorter the powder supply length between the spray gun 200 and the powder pump 400, the greater the actual maximum powder output of the spray gun 200. The powder supply system provided by this utility model can shorten the powder supply length between the spray gun 200 and the powder pump 400. With the reduced powder supply length, the resistance encountered by the mixture of powder and compressed air when conveying it to the spray gun 200 can be effectively reduced. The powder pump 400 can complete the powder delivery with a smaller compressed air flow rate, thereby reducing energy consumption. At the same time, the lower resistance also effectively increases the powder output, thereby improving the efficiency and effect of powder coating. Furthermore, during long-term use, the lower air flow rate and pressure can also reduce the wear and tear of related components, making the components of the powder supply system more durable, reducing the replacement frequency of related components, and helping to reduce factors that cause equipment downtime, thereby ensuring production efficiency.

[0037] According to some embodiments of the present invention, the spray gun 200 and the powder pump 400 are connected by a powder supply pipe 310.

[0038] In some embodiments, the length of the powder supply pipe 310 is 0.1 to 4.0 meters. Of course, in specific implementations, the length of the powder supply pipe 310 can be reduced according to actual conditions; for example, the length of the powder supply pipe 310 can be 0.1 to 3.0 meters. In other embodiments, the length of the powder supply pipe 310 can also be further reduced according to actual conditions; for example, the length of the powder supply pipe 310 can be 0.1 to 2.0 meters. Through the above settings, the powder supply system provided by this utility model has a powder supply length that is >40% shorter than the powder supply length of the traditional automatic spray gun 200 powder supply system. Therefore, compared to the powder supply system of the traditional automatic spray gun 200, the compressed air flow rate required for the powder pump 400 to deliver the same amount of powder in the powder supply system provided by this utility model can be significantly reduced. Without changing other equipment configurations and operating conditions, the powder conveying capacity of the powder pump 400 is significantly increased, and without changing other equipment configurations and operating conditions, the durability of the components between the powder pump 400 and the spray gun 200 is significantly increased.

[0039] Reference Figure 2 According to some embodiments of this utility model, the powder pump 400 is directly connected to the tail of the spray gun 200. As a result, the powder supply pipe 310 between the spray gun 200 and the powder pump 400 can be eliminated, and the powder supply length between the spray gun 200 and the powder pump 400 can be 0~0.15 meters, achieving a significant reduction in the powder supply length.

[0040] According to some embodiments of this utility model, the carrier 100 has at least one of a horizontal linear movement device, a vertical movement device, and an angle swing device, so that the carrier 100 can drive the spray gun 200 to move horizontally, vertically, or swing. The above-mentioned horizontal linear movement device, vertical movement device, and angle swing device are all commonly used devices in the mechanical field, and their specific structures will not be described in detail here.

[0041] Reference Figure 1 According to some embodiments of this utility model, it further includes a cyclone separator 700, a filter 800, and a powder transfer device 600. The top of the cyclone separator 700 is connected to the bottom of the spray chamber 500 via a recovery pipe 710, and the bottom of the cyclone separator 700 is connected to the powder transfer device 600. The filter 800 is connected to the air outlet 720 of the cyclone separator 700. A first powder recovery device 730 is provided at the bottom of the cyclone separator 700, and a second powder recovery device 810 is provided at the bottom of the filter 800. With the above configuration, the powder in the air inside the spray chamber 500 can be actively separated and recovered through the cyclone separator 700 and the filter 800. The cyclone separator 700 can separate most of the powder from the air and recover it to the second powder recovery device 810, while the filter 800 further recovers the small amount of powder remaining in the air discharged from the cyclone separator 700, making the finally discharged air cleaner and preventing the discharged air from carrying a large amount of powder and polluting the external environment.

[0042] Reference Figure 1 According to some embodiments of this utility model, the first powder recovery device 730 is connected to the powder transfer device 600 via a pipe. The powder transfer device 600 is located outside the spraying chamber 500 and is connected to the powder supply device 300 via a pipe. Alternatively, the first powder recovery device 730 integrates a powder conveying device to convey the recovered powder to the powder supply device 300, and the powder supply device 300 is connected to a new powder adding device. With the above configuration, the powder recovered in the first powder recovery device 730 can be automatically and promptly transported back to the powder supply device 300.

[0043] Reference Figure 3 According to some embodiments of this utility model, the powder supply system further includes a filter 800, which is connected to the spray chamber 500. The filter 800 is used to extract and filter the air inside the spray chamber 500, and a second powder recovery device 810 is provided at the bottom of the filter 800. The filter 800 can also be used to extract and filter the air inside the spray chamber 500, thereby completing powder recovery and reuse. In this case, the aforementioned cyclone separator 700 is not required.

[0044] According to some embodiments of this utility model, the second powder recovery device 810 integrates a powder conveying device to convey the recovered powder to the powder supply device 300, and the powder supply device 300 is connected to a new powder adding device. With the above configuration, the powder recovered in the first powder recovery device 730 can be automatically and promptly transported back to the powder supply device 300, and new powder can be added to the powder supply device 300 via the new powder adding device.

[0045] Reference Figure 3 According to some embodiments of this utility model, the second powder recovery device 810 is connected to a powder transfer device 600, which is connected to the powder supply device 300. With this configuration, the powder recovered in the first powder recovery device 730 can be automatically and promptly transported back to the powder supply device 300. Furthermore, new powder can be input into the powder transfer device 600, thereby achieving the addition of new powder.

[0046] In the specific implementation process, in addition to using pipelines and powder conveying devices or powder transfer devices 600 to complete the recycling of old powder, other methods can also be used to complete the recycling of old powder. For example, a handling robot or staff can be used to transport the old powder to the powder supply device 300.

[0047] According to some embodiments of the present invention, the powder pump 400 is a Venturi powder pump 400.

[0048] It should be noted that, since it is not limited by the size of the powder pump 400 and the spray gun 200, the pipes between the powder conveying device and the powder supply device 300, and the pipes between the powder transfer device 600 and the powder supply device 300, can be large-diameter pipes with low resistance, thereby enabling long-distance, low-resistance powder delivery to the powder supply device 300.

[0049] In the powder supply system provided by this utility model, one or more spray guns 200 and powder pumps 400 can be provided, and there is a one-to-one correspondence between the spray guns 200 and the powder pumps 400. The powder supply device 300 can supply powder to one or more powder pumps 400. Although the powder delivery flow area between the spray guns 200 and the powder pumps 400 is limited by the size of the spray guns 200 and the powder pumps 400, the powder supply system provided by this utility model can shorten the powder supply length between the spray guns 200 and the powder pumps 400, thereby controlling the energy consumption of the powder pumps 400, improving the powder delivery capacity of the powder pumps 400, reducing component wear, and ensuring production efficiency.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A powder supply system for an automatic spray gun (200), characterized in that, The system includes a carrier (100), a spray gun (200), a powder supply device (300), and a powder pump (400). The spray gun (200), the powder supply device (300), and the powder pump (400) are all installed on the carrier (100). The powder pump (400) is connected to the powder supply device (300) and the spray gun (200) to supply powder to the spray gun (200). The carrier (100) can move the spray gun (200), the powder supply device (300), and the powder pump (400) simultaneously so that the spray gun (200), the powder supply device (300), and the powder pump (400) are relatively stationary. The powder supply length between the spray gun (200) and the powder pump (400) is less than 5.0 meters.

2. A powder supply system for an automatic spray gun (200) according to claim 1, characterized in that, The powder pump (400) is directly connected to the tail of the spray gun (200), and the powder supply length between the spray gun (200) and the powder pump (400) is 0~0.15 meters.

3. A powder supply system for an automatic spray gun (200) according to claim 1, characterized in that, It also includes a spray chamber (500), the carrier (100) being at least partially located within the spray chamber (500), the spray gun (200) being located within the spray chamber (500), and the powder supply device (300) being located inside or outside the spray chamber (500).

4. A powder supply system for an automatic spray gun (200), characterized in that, The device includes a spray gun (200), a powder supply device (300), a powder pump (400), and a spray chamber (500). The powder pump (400) is connected to the powder supply device (300) and the spray gun (200) to supply powder to the spray gun (200). The spray gun (200) is located inside the spray chamber (500). The powder supply device (300) is fixedly installed inside or outside the spray chamber (500) and close to the spray gun (200). The powder supply length between the spray gun (200) and the powder pump (400) is less than 5.0 meters. The spray gun (200) is fixedly installed in the spray chamber (500), or the spray gun (200) is installed on a carrier (100) to move the spray gun (200) by the carrier (100).

5. A powder supply system for an automatic spray gun (200) according to claim 1 or 4, characterized in that, The spray gun (200) is connected to the powder pump (400) via a powder supply pipe (310), the length of which is 0.1 to 4.0 meters.

6. A powder supply system for an automatic spray gun (200) according to claim 5, characterized in that, The length of the powder supply pipe (310) is 0.1 to 3.0 meters.

7. A powder supply system for an automatic spray gun (200) according to claim 6, characterized in that, The length of the powder supply pipe (310) is 0.1 to 2.0 meters.

8. A powder supply system for an automatic spray gun (200) according to claim 1 or 4, characterized in that, The carrier (100) has at least one of a horizontal linear movement device, a vertical movement device, and an angle swing device, so that the carrier (100) can drive the spray gun (200) to move horizontally, vertically, or swing.

9. A powder supply system for an automatic spray gun (200) according to claim 3 or 4, characterized in that, It also includes a cyclone separator (700), a filter (800), and a powder transfer device (600). The top of the cyclone separator (700) is connected to the bottom of the spray chamber (500) through a recovery pipe (710). The bottom of the cyclone separator (700) is connected to the powder transfer device (600). The filter (800) is connected to the air outlet (720) of the cyclone separator (700). A first powder recovery device (730) is provided at the bottom of the cyclone separator (700), and a second powder recovery device (810) is provided at the bottom of the filter (800).

10. A powder supply system for an automatic spray gun (200) according to claim 9, characterized in that: The first powder recovery device (730) is connected to the powder transfer device (600) via a pipe. The powder transfer device (600) is located outside the spraying chamber (500) and is connected to the powder supply device (300) via a pipe; or, The first powder recovery device (730) integrates a powder conveying device to convey the recovered powder to the powder supply device (300), and the powder supply device (300) is connected to a new powder adding device.

11. A powder supply system for an automatic spray gun (200) according to claim 3 or 4, characterized in that, It also includes a filter (800) connected to the spray chamber (500), the filter (800) being used to extract and filter the air in the spray chamber (500), and a second powder recovery device (810) being provided at the bottom of the filter (800).

12. A powder supply system for an automatic spray gun (200) according to claim 11, characterized in that: The second powder recovery device (810) integrates a powder conveying device to convey the recovered powder to the powder supply device (300), and the powder supply device (300) is connected to a new powder adding device; or, The second powder recovery device (810) is connected to a powder transfer device (600), which is connected to the powder supply device (300).

13. A powder supply system for an automatic spray gun (200) according to claim 1 or 4, characterized in that, The powder pump (400) is a Venturi powder pump (400).

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