Powder supply system for automatic spray gun

Abstract

The invention discloses a powder supply system for an automatic spray gun, which comprises 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 arranged on the carrier, and the powder pump is connected with the powder supply device and the spray gun to supply powder to the spray gun. The carrier can move the spray gun, the powder supply device and the powder pump at the same time so that the spray gun, the powder supply device and the powder pump can be relatively static, and the powder supply length between the spray gun and the powder pump is smaller than 5.0 m. According to the powder supply system, the powder supply length between the spray gun and the powder pump can be shortened, the energy consumption of the powder pump can be controlled, the powder conveying capacity of the powder pump is improved, the part loss is reduced, and the production efficiency is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spraying equipment, in particular to a powder supply system for an automatic spray gun. BACKGROUND

[0002] In the existing electrostatic powder spraying system, the powder supply system of the automatic spray gun is generally composed of a powder supply device, a powder suction pipe, a Venturi powder pump and a powder supply pipe. In the traditional powder supply system, the powder supply device is fixed on the ground and placed outside the spraying chamber, the Venturi powder pump is installed at the powder supply device, the Venturi powder pump sucks the powder in the powder supply device through the powder suction pipe, and then provides the powder to the spray gun located in the spraying chamber through the powder supply pipe. However, this traditional powder supply system has significant defects: since the spray gun needs to be installed on a carrier to move within a certain range, the length of the powder supply pipe is generally in the range of 8-20 meters to meet the needs of the movement of the spray gun, the powder supply length between the Venturi powder pump and the spray gun is large, and the resistance of the mixture of powder and compressed air is greatly increased when it is transported to the spray gun, which directly leads to the need for a larger compressed air flow for the Venturi powder pump to complete the powder transportation, increasing energy consumption. At the same time, the larger resistance also makes it difficult to effectively improve the powder output, seriously affecting the efficiency and effect of electrostatic powder spraying, and in the long-term use process, the higher air flow and pressure will exacerbate the wear of related parts, increasing the frequency of replacing various parts of the powder supply system, increasing the equipment downtime, and causing a decline in production efficiency. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a powder supply system for an automatic spray gun, which can shorten the powder supply length between the spray gun and the powder pump, facilitate the control of the powder pump energy consumption, improve the powder pump powder delivery capacity, reduce the part wear, and ensure the production efficiency.

[0004] The powder supply system for an automatic spray gun according to the first aspect of the present application comprises 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 installed on the carrier, the powder pump is connected with the powder supply device and the spray gun to supply powder to the spray gun, the carrier can simultaneously move the spray gun, the powder supply device and the powder pump to make the spray gun, the powder supply device and the powder pump relatively stationary, and the powder supply length between the spray gun and the powder pump is less than 5.0 meters.

[0005] According to the powder supply system for the automatic spray gun provided by the embodiment of the present application, at least the following beneficial effects are achieved: the powder supply system provided by the present application can shorten the powder supply length between the spray gun and the powder pump, compared with the powder supply length between the spray gun and the powder pump in the prior art, thereby facilitating the control of the energy consumption of the powder pump, improving the powder delivery capacity of the powder pump, reducing the component wear, and ensuring the production efficiency.

[0006] According to the powder supply system for the automatic spray gun provided by the embodiment of the second aspect of the present application, the powder supply system comprises a spray gun, a powder supply device, a powder pump, and a spraying chamber, the powder pump is connected with the powder supply device and the spray gun to supply powder to the spray gun, the spray gun is located in the spraying chamber, the powder supply device is fixedly installed inside or outside the spraying chamber and close to the spray gun, and the powder supply length between the spray gun and the powder pump is less than 5.0 meters, wherein the spray gun is fixedly installed in the spraying chamber, or the spray gun is installed on a carrier to move the spray gun through the carrier.

[0007] According to the powder supply system for the automatic spray gun provided by the embodiment of the present application, at least the following beneficial effects are achieved: in the powder supply system provided by the present application, the spray gun can be fixedly installed in the spraying chamber or installed on a carrier, and 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, thereby facilitating the control of the energy consumption of the powder pump, improving the powder delivery capacity of the powder pump, reducing the component wear, and ensuring the production efficiency.

[0008] According to some embodiments of the present application, the spray gun and the powder pump are connected through a powder supply pipe, and the length of the powder supply pipe is 0.1-4.0 meters.

[0009] According to some embodiments of the present application, the length of the powder supply pipe is 0.1-3.0 meters.

[0010] According to some embodiments of the present application, the length of the powder supply pipe is 0.1-2.0 meters.

[0011] According to some embodiments of the present application, 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 0-0.15 meters.

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

[0013] According to some embodiments of the present application, a spraying chamber is further included, 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 the present application, a cyclone separation device and a filter are further included, a top of the cyclone separation device is communicated with a bottom of the spraying chamber through a recovery pipeline, a bottom of the cyclone separation device is connected with the powder transfer device, the filter is connected with an air outlet of the cyclone separation device, the bottom of the cyclone separation device is provided with a first powder recovery device, and the bottom of the filter is provided with a second powder recovery device.

[0015] According to some embodiments of the present application, the first powder recovery device is connected with a powder transfer device through a pipeline, the powder transfer device is located outside the spraying chamber and connected with the powder supply device through a pipeline; or, the first powder recovery device is integrated with a powder conveying device to convey the recovered powder to the powder supply device, and the powder supply device is connected with a new powder adding device.

[0016] According to some embodiments of the present application, a filter is further included, the filter is connected with the spraying chamber, the filter is used to extract and filter air in the spraying chamber, and the bottom of the filter is provided with a second powder recovery device.

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

[0018] According to some embodiments of the present application, the powder pump is a Venturi powder pump.

[0019] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A schematic diagram of a powder supply system for an automatic spray gun according to some embodiments of the present application;

[0022] Figure 2 For Figure 1 A schematic diagram of a carriage for a powder supply system for an automatic spray gun is shown.

[0023] Figure 3 A schematic diagram of a powder supply system for an automatic spray gun is shown.

[0024] Reference numerals:

[0025] Carriage 100, spray gun 200, powder supply device 300, powder pump 400, powder supply tube 410, spray booth 500, powder transfer device 600, cyclone separation device 700, recovery duct 710, air outlet 720, first powder recovery device 730, filter 800, second powder recovery device 810. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example embodiments in which the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary only and are intended to explain the present application, and are not to be understood as limiting the present application.

[0027] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood to not include the number, above, below, etc. are understood to include the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0029] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0030] With reference to Figure 1 and Figure 2According to some embodiments of the present application, the powder supply system for the automatic spray gun 200 can include a carrier 100, a spray gun 200, a powder supply device 300, and a powder pump 400, wherein 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 with the powder supply device 300 and the spray gun 200 to supply powder to the spray gun 200, the carrier 100 is capable of moving the spray gun 200, the powder supply device 300, and the powder pump 400 simultaneously to make the spray gun 200, the powder supply device 300, and the powder pump 400 relatively stationary, and the powder supply length between the spray gun 200 and the powder pump 400 is less than 5.0 meters.

[0031] The powder supply system provided by the present application can make the spray gun 200, the powder supply device 300, and the powder pump 400 relatively stationary when the carrier 100 moves the spray gun 200 to spray, and thus the powder supply length between the spray gun 200 and the powder pump 400 can be less than 5.0 meters. 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 the present application can shorten the powder supply length between the spray gun 200 and the powder pump 400, thereby facilitating the control of the energy consumption of the powder pump 400, improving the powder delivery capacity of the powder pump 400, reducing the component wear, and ensuring the production efficiency.

[0032] Reference Figure 1 In some embodiments, the powder supply system can further include a spray booth 500, wherein the carrier 100 is at least partially located in the spray booth 500, the spray gun 200 is located in the spray booth 500, and the powder supply device 300 is located inside or outside the spray booth 500. In this way, the spray gun 200 can perform the spraying work in the dedicated spray booth 500, and the situation that the powder splashes everywhere can be effectively avoided.

[0033] Of course, in other embodiments, the spray gun 200 can also not work in the spray booth 500, and in this case, the spray booth 500 can not be provided.

[0034] The powder supply system for the automatic spray gun 200 according to some embodiments of the present application can include the spray gun 200, the powder supply device 300, the powder pump 400, and the spray booth 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 in the spray booth 500. The powder supply device 300 is fixedly installed inside the spray booth 500 and close to the spray gun 200. Thus, 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 can also be fixedly installed outside the spray booth 500 and close to the spray gun 200. Because the wall thickness of the spray booth 500 is not too thick, 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 in the carrier 100 to move the spray gun 200 by the carrier 100.

[0035] In the actual implementation, the powder supply device 300 can be fixedly installed on the inner wall or the outer wall of the spray booth 500 or other objects such as a support.

[0036] In the powder supply system provided by the present application, the spray gun 200 can be fixedly installed in the spray booth 500 or the carrier 100. Meanwhile, by installing the powder supply device 300 inside or outside the spray booth 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. Thus, 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 the present application can shorten the powder supply length between the spray gun 200 and the powder pump 400, thereby facilitating the control of the energy consumption of the powder pump 400, improving the powder delivery capacity of the powder pump 400, reducing the component wear, and ensuring the production efficiency.

[0037] In the actual implementation, the spray gun 200 can be arranged in a straight line. In the case of fixedly installing the powder supply device 300, the powder supply device 300 can be correspondingly arranged at the middle position of the plurality of spray guns 200. The powder pump 400 is fixed on the powder supply device 300. Thus, it is more beneficial to control the powder supply length between each spray gun 200 and the powder pump 400. By arranging a plurality of spray guns 200, the working range required by each spray gun 200 can be reduced, thereby shortening the powder supply length between the spray gun 200 and the powder pump 400.

[0038] The following is a table of the actual maximum powder output of the spray gun under different powder supply lengths (from the powder pump to the spray gun) in the same equipment conditions:

[0039]

[0040] It should be noted that due to different powders, different brands and models of powder pumps and the like, the powder output will be different to varying degrees. Therefore, the above data is for reference only.

[0041] It can be seen that the smaller 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 the present application can shorten the powder supply length between the spray gun 200 and the powder pump 400. In the case of a reduced powder supply length, the resistance experienced by the mixture of powder and compressed air when being transported to the spray gun 200 can be effectively reduced. The powder pump 400 can complete powder delivery with a smaller compressed air flow, thereby reducing energy consumption. At the same time, the smaller resistance also effectively increases the powder output, thereby improving the efficiency and effectiveness of powder spraying. In the long-term use process, lower air flow and pressure can also reduce the wear of related parts, making the powder supply system related parts more durable, reducing the replacement frequency of related parts, and being conducive to reducing the factors causing equipment downtime, thereby ensuring production efficiency.

[0042] According to some embodiments of the present application, the spray gun 200 and the powder pump 400 are connected through the powder supply pipe 310.

[0043] In some embodiments, the length of the powder supply pipe 310 is 0.1-4.0 meters. Of course, in the specific implementation process, the length of the powder supply pipe 310 can be reduced according to the actual situation, for example, the length of the powder supply pipe 310 can be 0.1-3.0 meters. In other embodiments, the length of the powder supply pipe 310 can be further reduced according to the actual situation, for example, the length of the powder supply pipe 310 is 0.1-2.0 meters. Through the above setting, the powder supply system provided by the present application has a powder supply length that is reduced by >40% compared to the powder supply system of the traditional automatic spray gun 200. Therefore, compared to the powder supply system of the traditional automatic spray gun 200, the powder pump 400 of the powder supply system provided by the present application can greatly reduce the compressed air flow required to deliver the same powder. In the case where other equipment configurations and working conditions do not change, the powder delivery capacity of the powder pump 400 is greatly increased, and in the case where other equipment configurations and working conditions do not change, the durability of the parts between the powder pump 400 and the spray gun 200 is greatly increased.

[0044] Referring to Figure 2 According to some embodiments of the present application, the powder pump 400 is directly connected to the tail of the spray gun 200. Therefore, the powder supply pipe 310 between the spray gun 200 and the powder pump 400 can be omitted, 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 powder supply length.

[0045] According to some embodiments of the present application, the carrier 100 is provided with at least one of a horizontal linear moving device, a vertical moving device and an angle swinging device, so that the carrier 100 can drive the spray gun 200 to move horizontally linearly, vertically or swing. The horizontal linear moving device, the vertical moving device and the angle swinging device are all common devices in the mechanical field, and their specific structures are not described in detail here.

[0046] With reference to Figure 1 According to some embodiments of the present application, the powder supply system further comprises a cyclone separation device 700 and a filter 800, the top of the cyclone separation device 700 is connected with the bottom of the spray booth 500 through a recovery pipeline 710, the bottom of the cyclone separation device 700 is connected with the powder transfer device 600, the filter 800 is connected with an air outlet 720 of the cyclone separation device 700, the bottom of the cyclone separation device 700 is provided with a first powder recovery device 730, and the bottom of the filter 800 is provided with a second powder recovery device 810. With the above arrangement, the powder in the air in the spray booth 500 can be actively separated and recovered by the cyclone separation device 700 and the filter 800. The cyclone separation device 700 can separate most of the powder from the air and recover it to the second powder recovery device 810, and the filter 800 can further recover the small amount of powder remaining in the air discharged by the cyclone separation device 700, so that the finally discharged air is cleaner, and pollution of the external environment caused by the discharged air carrying a large amount of powder is avoided.

[0047] With reference to Figure 1 According to some embodiments of the present application, the first powder recovery device 730 is connected with the powder transfer device 600 through a pipeline, the powder transfer device 600 is located outside the spray booth 500 and is connected with the powder supply device 300 through a pipeline; or, the first powder recovery device 730 is integrated with a powder conveying device to convey the recovered powder to the powder supply device 300, and the powder supply device 300 is connected with a new powder adding device. With the above arrangement, the powder recovered into the first powder recovery device 730 can be automatically conveyed back to the powder supply device 300 in time.

[0048] With reference to Figure 3 According to some embodiments of the present application, the powder supply system further comprises a filter 800, the filter 800 is connected with the spray booth 500, the filter 800 is used to extract and filter the air in the spray booth 500, and the bottom of the filter 800 is provided with a second powder recovery device 810. The filter 800 can also be used to extract and filter the air in the spray booth 500, so as to complete the powder recycling. At this time, the cyclone separation device 700 described above can not be provided.

[0049] According to some embodiments of the present application, the second powder recovery device 810 is integrated with a powder conveying device to convey the recovered powder to the powder supply device 300, and the powder supply device 300 is connected with a new powder adding device. With the above arrangement, the powder recovered into the first powder recovery device 730 can be automatically conveyed back to the powder supply device 300 in time, and the powder supply device 300 can be added with new powder through the new powder adding device.

[0050] With reference to Figure 3 According to some embodiments of the present application, the second powder recovery device 810 is connected with a powder transfer device 600, and the powder transfer device 600 is connected with the powder supply device 300. With the above arrangement, the powder recovered into the first powder recovery device 730 can be automatically conveyed back to the powder supply device 300 in time, and in addition, new powder can be input into the powder transfer device 600, so as to realize new powder adding.

[0051] In the implementation process, in addition to the above-mentioned manner of recovering old powder by using the pipeline and the powder conveying device or the powder transfer device 600, other manners can also be used to recover old powder, for example, a carrying robot or a worker can be used to carry the old powder to the powder supply device 300.

[0052] According to some embodiments of the present application, the powder pump 400 is a Venturi powder pump 400.

[0053] It should be noted that, since the powder pump 400 and the spray gun 200 are not limited in size, the pipeline between the powder conveying device and the powder supply device 300 and the pipeline between the powder transfer device 600 and the powder supply device 300 can be large-diameter pipelines with small resistance, so as to realize the conveying of powder to the powder supply device 300 with large length and small resistance.

[0054] In the powder supply system provided by the present application, one or more than two spray guns 200 and powder pumps 400 can be provided, and the spray guns 200 and the powder pumps 400 are in one-to-one correspondence, and the powder supply device 300 can supply powder to one or more than two powder pumps 400. Although the powder conveying flow area between the spray gun 200 and the powder pump 400 is limited by the size of the spray gun 200 and the powder pump 400, the powder supply system provided by the present application can shorten the powder conveying length between the spray gun 200 and the powder pump 400, so as to realize the control of the energy consumption of the powder pump 400, improve the powder conveying capacity of the powder pump 400, reduce the part wear, and ensure the production efficiency.

[0055] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0056] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A powder supply system for an automatic spray gun (200), characterized in that, The powder spraying device comprises 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 with 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) to make the spray gun (200), the powder supply device (300), and the powder pump (400) relatively stationary, and 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), characterized by, The powder spraying device comprises a spray gun (200), a powder supply device (300), a powder pump (400), and a spraying chamber (500), the powder pump (400) is connected with the powder supply device (300) and the spray gun (200) to supply powder to the spray gun (200), the spray gun (200) is located in the spraying chamber (500), the powder supply device (300) is fixedly installed 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) is less than 5.0 meters, wherein the spray gun (200) is fixedly installed on the spraying chamber (500), or the spray gun (200) is installed on a carrier (100) to move the spray gun (200) by the carrier (100).

3. A powder supply system for an automatic spray gun (200) according to claim 1 or 2, characterized in that, The spray gun (200) and the powder pump (400) are connected through a powder supply pipe (310), and the length of the powder supply pipe (310) is 0.1-4.0 meters.

4. A powder supply system for an automatic spray gun (200) according to claim 3, characterized in that The length of the powder supply pipe (310) is 0.1-3.0 meters.

5. A powder supply system for an automatic spray gun (200) according to claim 4, characterized in that The length of the powder supply pipe (310) is 0.1-2.0 meters.

6. 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.

7. A powder supply system for an automatic spray gun (200) according to claim 1 or 2, characterized in that, The carrier (100) is provided with at least one of a horizontal linear movement device, a vertical movement device, and an angle swinging device, so that the carrier (100) can drive the spray gun (200) to move horizontally and linearly, vertically, or swing.

8. A powder supply system for an automatic spray gun (200) according to claim 1, characterized in that, The powder spraying device further comprises a spraying chamber (500), the carrier (100) is at least partially located in the spraying chamber (500), the spray gun (200) is located in the spraying chamber (500), and the powder supply device (300) is located inside or outside the spraying chamber (500).

9. A powder supply system for an automatic spray gun (200) according to claim 2 or 8, characterized in that, Further comprising a cyclone separation device (700) and a filter (800), the cyclone separation device (700) is connected with the bottom of the spraying chamber (500) through a recovery pipeline (710), the bottom of the cyclone separation device (700) is connected with the powder transfer device (600), the filter (800) is connected with the air outlet (720) of the cyclone separation device (700), the bottom of the cyclone separation device (700) is provided with a first powder recovery device (730), and the bottom of the filter (800) is provided with a second powder recovery device (810).

10. The powder supply system for the automatic spray gun (200) according to claim 9, wherein: the first powder recovery device (730) is connected with the powder transfer device (600) through a pipeline, the powder transfer device (600) is located outside the spraying chamber (500) and is connected with the powder supply device (300) through a pipeline; or, the first powder recovery device (730) is integrated with a powder conveying device to convey the recovered powder to the powder supply device (300), and the powder supply device (300) is connected with a new powder adding device.

11. A powder supply system for an automatic spray gun (200) according to claim 2 or 8, characterized in that, Further comprising a filter (800), the filter (800) is connected with the spraying chamber (500), the filter (800) is used to extract and filter the air in the spraying chamber (500), and the bottom of the filter (800) is provided with a second powder recovery device (810).

12. The powder supply system for the automatic spray gun (200) according to claim 11, wherein: the second powder recovery device (810) is integrated with a powder conveying device to convey the recovered powder to the powder supply device (300), and the powder supply device (300) is connected with a new powder adding device; or, the second powder recovery device (810) is connected with a powder transfer device (600), and the powder transfer device (600) is connected with the powder supply device (300).

13. A powder supply system for an automatic spray gun (200) according to claim 1 or 2, characterized in that, the powder pump (400) is a Venturi powder pump (400).

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