Powder conveying device

Abstract

The utility model discloses a powder conveying device, and relates to the technical field of conveying equipment. The powder conveying device comprises a conveying pipe, a negative pressure machine and an air source part, the conveying pipe is used for conveying powder, one end of the conveying pipe is a feeding port, the other end of the conveying pipe is a discharging port, and the conveying pipe is further provided with a positive pressure port and an air supplementing port; the negative pressure machine is connected with the discharge hole so as to suck out the powder; the gas source piece is connected with the positive pressure opening so as to output gas to the conveying pipe. According to the powder conveying device, pipeline blockage and material residues can be reduced, and the powder conveying efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of conveying equipment technology, specifically to a powder conveying device. Background Technology

[0002] Existing powder conveying devices are prone to pipe blockage and material residue when handling powder materials with small particle size, poor flowability and easy adsorption, which in turn affects the powder conveying efficiency.

[0003] Therefore, there is room for improvement in powder conveying devices. Utility Model Content

[0004] 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 conveying device that can reduce pipe blockage and material residue, and improve powder conveying efficiency.

[0005] According to an embodiment of the present invention, a powder conveying device includes: a conveying pipe, a negative pressure unit, and a gas source component. The conveying pipe is used to convey powder, one end of the conveying pipe is a feed inlet and the other end is a discharge outlet. The conveying pipe is also provided with a positive pressure port and a gas supply port. The negative pressure unit is connected to the discharge outlet to draw out the powder. The gas source component is connected to the positive pressure port to output gas to the conveying pipe.

[0006] According to the powder conveying device of this utility model embodiment, a negative pressure suction is generated by connecting the negative pressure pump to the outlet of the conveying pipe, effectively extracting powder and improving powder flowability. A positive pressure port connected to the conveying pipe via a gas source component allows for timely gas output into the pipe according to conveying needs, facilitating smooth powder flow within the pipe, reducing powder adsorption residue on the pipe wall, and further improving conveying efficiency. An air replenishment port on the conveying pipe replenishes gas, further preventing powder blockage and improving powder conveying efficiency.

[0007] The powder conveying device according to some embodiments of the present invention further includes: an air replenishment regulating valve, which is provided corresponding to the air replenishment port to adjust the size of the air replenishment port.

[0008] In some optional embodiments, the conveying pipe includes a main pipe and a branch pipe, with the inlet and outlet of the main pipe being the two ends respectively; the branch pipe includes an air supply pipe, with one end of the air supply pipe connected to the main pipe and the other end being the air supply port, and the air supply pipe being connected to the top of the main pipe so that gas is supplied from the top of the main pipe.

[0009] According to some optional embodiments, the angle between the air supply pipe and the main pipe is an acute angle; the air supply pipe is positioned upstream of the main pipe from the air supply port to the main pipe.

[0010] Specifically, the included angle α between the air supply pipe and the main pipe satisfies 30°≤α≤60°.

[0011] According to some embodiments of the powder conveying device, the length of the air supply pipe is L, which satisfies 30mm≤L≤50mm.

[0012] The powder conveying device according to some embodiments of the present invention further includes: a filter element disposed corresponding to the air inlet.

[0013] Specifically, the filter element is a dustproof mesh.

[0014] According to some optional embodiments, the powder conveying device further includes: a feed hopper and a discharge valve; the lower opening of the feed hopper is connected to the feed inlet; the discharge valve is located at the feed inlet to control the opening and closing of the discharge inlet.

[0015] In some alternative embodiments, the air source is an air compressor.

[0016] According to some embodiments, the powder conveying device further includes: an electrostatic eliminator, which is a conductor, one end of which is connected to the conveying pipe and the other end is used for grounding.

[0017] In some alternative embodiments, the static eliminator is a wire with one end sleeved on the delivery pipe, the delivery pipe being a conductor, and the wire in contact with the delivery pipe.

[0018] Optionally, the powder conveying device further includes an electromagnetic iron remover for removing iron from the powder, wherein the electromagnetic iron remover is located downstream of the negative pressure machine.

[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:

[0021] Figure 1 This is a schematic diagram of the structure of a powder conveying device according to some embodiments of the present invention;

[0022] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0023] Figure label:

[0024] Powder conveying device 100, conveying pipe 10, main pipeline 11, feed inlet 111, discharge outlet 112, positive pressure port 113, air supply port 114, branch pipeline 13, air supply pipe 131, negative pressure machine 20, air source machine 30, air supply regulating valve 40, feed hopper 50, discharge valve 60, static electricity elimination component 70, electromagnetic iron remover 80. Detailed Implementation

[0025] 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.

[0026] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The following is for reference. Figures 1-2 Describes a powder conveying device 100 according to an embodiment of the present utility model.

[0029] like Figure 1 As shown, the powder conveying device 100 includes: a conveying pipe 10, a negative pressure unit 20, and an air source unit 30. The conveying pipe 10 is used to convey powder, with one end being an inlet 111 and the other end being an outlet 112. Here, the conveying pipe 10 is used for powder transfer; the powder enters from the inlet 111, and after the conveying process, it is discharged from the outlet 112.

[0030] The negative pressure unit 20 is connected to the discharge port 112. Specifically, the negative pressure unit 20 is used to reduce the pressure at the discharge port 112 to create a negative pressure environment relative to the inlet 111, so that the powder can be sucked in along the conveying pipe 10, and then the powder is drawn from the inlet 111 to the discharge port 112 to complete the transmission purpose.

[0031] The delivery pipe 10 is also provided with a positive pressure port 113 and a gas supply port 114. The gas source component 30 is connected to the positive pressure port 113 to output gas to the delivery pipe 10.

[0032] The gas source component 30 is used to provide a certain gas flow into the conveying pipe 10 to further push the powder towards the discharge port 112.

[0033] In some alternative embodiments, the gas source 30 may be a fan, a compressed air supply system, or other form of gas generating device.

[0034] Optionally, the gas source 30 is used to provide dry gas. This prevents the powder from absorbing moisture and clumping, ensuring that the powder remains loose during transportation, thereby maintaining the unobstructed flow of the conveying pipe 10 and improving transportation efficiency.

[0035] In some optional embodiments, when the conveying pipe 10 includes bends or other turning points, positive pressure ports 113 are provided near these turning points, and the air source component 30 is connected to the positive pressure ports 113. Since these turning points have high resistance and are prone to powder accumulation, by providing positive pressure ports 113 near these locations, positive pressure gas can be introduced to help overcome local resistance, prevent powder accumulation in these areas, and thus maintain continuous powder flow.

[0036] It is worth noting that during some longer conveying processes, the gas supplied by the positive pressure port 113 is limited, which cannot guarantee that all powder particles will move forward uniformly and stably. Therefore, the powder conveying device 100 of this embodiment of the present invention is also provided with an air replenishment port 114.

[0037] The air inlet 114 is used to supplement additional air or gas, enhance the convection effect of gas in the conveying pipe 10, help the gas cover the entire conveying pipe 10 more quickly, and make the gas move from the positive pressure port 113 to the discharge port 112 more quickly, thereby driving the powder to move smoothly.

[0038] According to some optional embodiments, there may be one or more air inlets 114.

[0039] In some optional embodiments, the air inlet 114 is located between the feed inlet 111 and the discharge outlet 112. When the powder conveying device 100 is applied to some long-distance conveying systems, powder deposition is prone to occur in the intermediate section due to gas pressure loss. By setting the air inlet 114 at these locations, a certain amount of gas can be added to maintain a positive pressure environment in the conveying pipe 10, ensuring that the powder can move smoothly.

[0040] Alternatively, in some other alternative embodiments, the supplementary air inlet 114 is located upstream of the feed inlet 111 in the direction of powder conveying. This allows the powder to receive additional propulsion as soon as it enters the conveying pipe 10, helping it to quickly mix with the conveying gas and begin moving forward, reducing the residence time of the powder near the feed inlet 111, and thus improving conveying efficiency.

[0041] In addition, the feed inlet 111 is the first contact point for powder entering the device and one of the most prone to clogging. By setting an air supply port 114 in front of the feed inlet 111, the gas flow rate in this area can be increased, effectively preventing powder from accumulating at the inlet and ensuring that the powder enters the conveying system smoothly.

[0042] In some optional embodiments, the air inlet 114 can be located at the top, bottom, or side of the delivery pipe 10. The specific configuration can be determined according to requirements.

[0043] like Figure 1 and Figure 2 As shown, the powder conveying device 100 according to some embodiments of the present invention further includes: an air replenishment regulating valve 40, which is provided corresponding to the air replenishment port 114 to adjust the size of the air replenishment port 114.

[0044] By setting the gas supply regulating valve 40, the opening size of the gas supply port 114 can be precisely adjusted, thereby controlling the gas flow rate entering the delivery pipe 10.

[0045] By dynamically adjusting the air supply of the air inlet 114, the gas flow can be flexibly adjusted according to actual needs to ensure that the powder is in the optimal state during the conveying process, so as to maximize the conveying efficiency.

[0046] Optionally, the air replenishment regulating valve 40 can be manually or automatically regulated.

[0047] To adapt to different needs, the air supply regulating valve 40 can be a butterfly valve, ball valve, needle valve, etc. Adjustments can be made according to requirements; this application does not impose specific limitations.

[0048] like Figure 1As shown, according to some optional powder conveying devices 100 of this utility model, the conveying pipe 10 includes a main pipe 11 and a branch pipe 13. The two ends of the main pipe 11 are an inlet 111 and an outlet 112, respectively. The branch pipe 13 includes an air supply pipe 131. One end of the air supply pipe 131 is connected to the main pipe 11, and the other end is an air supply port 114. The air supply pipe 131 is connected to the top of the main pipe 11 so that gas is supplied from the top of the main pipe 11.

[0049] In the above technical solution, the main pipeline 11 is used to transport powder, so that the powder is transferred from the feed inlet 111 to the discharge outlet 112.

[0050] Optionally, the inner wall of the main pipe 11 can be specially treated, for example, by polishing to make the inner wall smoother to reduce frictional resistance, thereby improving the powder conveying efficiency.

[0051] Branch pipe 13 is used to introduce supplementary gas. Here, the supplementary gas pipe 131 is connected to the top of the main pipe 11. The supplementary gas is introduced from the top of the main pipe 11, causing the suspended powder to gather at the bottom of the main pipe 11 under the combined action of gravity and airflow. The powder concentrated at the bottom is more easily carried forward by the airflow, thereby improving the powder conveying efficiency. In addition, this arrangement can also enhance the effective pushing of the gas on the powder at the bottom, reduce the residence time of the powder in the pipe, and prevent blockage.

[0052] In addition, the branch pipe 13 is located at the top of the main pipe 11. Gravity is used to prevent powder from accidentally entering the branch pipe 13, ensuring that only the supplementary gas enters the main pipe 11 through the branch pipe 13, thus ensuring the stable operation of the system.

[0053] Optionally, combined Figure 2 The angle between the air supply pipe 131 and the main pipe 11 is an acute angle.

[0054] Setting the angle to an acute angle helps guide the supplementary gas to flow along the inner wall of the main pipe 11, forming a smoother airflow path. Compared to a right-angle connection, the acute angle design reduces airflow turbulence and resistance, allowing the gas to propel the powder forward more efficiently.

[0055] The air supply pipe 131 is installed upstream of the main pipeline 11, from the air supply port 114 to the main pipeline 11.

[0056] This configuration means that the supplementary gas first enters the existing airflow in the reverse direction. This causes the powder in the main pipe 11 to converge downwards, making it easier for the powder to be blown by the gas in the main pipe 11, thereby improving transportation efficiency.

[0057] Combination Figure 1In some optional embodiments, the gas supply pipe 131 is located near the feed inlet 111, so that the gas supply can also supply gas towards the feed inlet 111, increasing the gas flow rate in the feeding area, preventing the powder from stagnating and agglomerating in this area, and ensuring that the powder smoothly enters the main pipe 11.

[0058] See Figure 2 The angle α between the gas supply pipe 131 and the main pipe 11 satisfies 30°≤α≤60°. For example, the angle α between the gas supply pipe 131 and the main pipe 11 can be 30°, 35°, 45°, 50°, 60°, etc. Controlling the angle α between 30° and 60° ensures that the supplementary gas enters the main pipe 11 at an optimal angle, which not only allows the powder to converge towards the bottom of the main pipe 11 but also reduces the risk of blockage.

[0059] In some alternative embodiments, see Figure 2 The length L of the gas supply pipe 131 must satisfy 30mm ≤ L ≤ 50mm. For example, the length L of the gas supply pipe 131 can be 30mm, 35mm, 40mm, 45mm, or 50mm. Controlling the length L of the gas supply pipe 131 between 30mm and 50mm ensures that it provides sufficient gas flow to optimize powder transport while avoiding excessive length that would complicate installation and require unnecessary space. This design also ensures that gas enters the main pipe 11 quickly and effectively, reducing energy loss and improving the overall system efficiency.

[0060] According to some optional powder conveying devices 100 of this utility model, a filter element is also provided corresponding to the air supply port 114.

[0061] By installing filters, the purity of the gas entering the gas supply pipe 131 can be ensured, preventing external impurities and particulate matter from entering the main pipe 11 with the gas, thus avoiding contamination of the powder or affecting the conveying efficiency.

[0062] In some alternative technical solutions, the filter element can be installed at the inlet of branch pipe 13. Placing the filter element at the inlet of branch pipe 13 ensures that all gas entering branch pipe 13 is filtered, preventing external dust and other impurities from entering the main pipe 11. At the same time, the inlet location is usually more accessible, facilitating inspection and replacement of the filter element and reducing downtime.

[0063] Alternatively, in some alternative technical solutions, the filter element is located in the middle section of branch pipe 13. When the filter element is located in the middle section of branch pipe 13, the gas has a longer path and more time to contact the filter element during its passage through branch pipe 13. This helps to ensure that impurities and particulate matter in the gas are captured and filtered more thoroughly, thereby making the gas entering the main pipe 11 purer and ensuring the stability of the system.

[0064] Alternatively, in some alternative technical solutions, the filter element is installed at the outlet of branch pipe 13. This arrangement also enables the filtration of the supplementary gas.

[0065] Optionally, the filter element can be a filter screen, activated carbon filter, etc.

[0066] In some specific embodiments, the filter element is a dustproof mesh.

[0067] Dust screens are easy to clean and reuse, reducing maintenance costs and ensuring long-term system operation.

[0068] Optionally, the dust filter can be an electrostatic dust removal filter or a high-efficiency particulate air filter.

[0069] According to some optional embodiments of the present invention, see [reference]. Figure 1 The powder conveying device 100 also includes a feed hopper 50 and a discharge valve 60. The lower opening of the feed hopper 50 is connected to the feed inlet 111. The discharge valve 60 is located at the feed inlet 111 to control the opening and closing of the discharge inlet.

[0070] In the above technical solution, the combined use of the feed hopper 50 and the discharge valve 60 can ensure that the powder enters the conveying system smoothly and evenly, reducing transportation fluctuations caused by unstable powder supply.

[0071] Optionally, the discharge valve 60 can be a manual discharge valve 60 or an automatic discharge valve 60.

[0072] In some alternative embodiments, the air source 30 is an air compressor.

[0073] Air compressors can provide a stable and high-pressure gas flow for powders, thereby ensuring that the powders can be transported efficiently and reliably.

[0074] Optionally, the powder conveying device 100 also includes a dryer, which is mounted on the air compressor. The dryer removes moisture from the compressed air, preventing the powder from absorbing moisture and clumping.

[0075] Powder may also generate static electricity during transportation, which can cause dust to adhere to the inner walls of pipes or other components, affecting the normal operation of the system. Therefore, in some cases, such as... Figure 1 In the embodiment shown, the powder conveying device 100 further includes an electrostatic eliminator 70.

[0076] The static eliminator 70 is used to eliminate static electricity in the powder conveying device 100, so as to reduce or even avoid the powder from being attracted to the inner wall of the pipe or other components due to static electricity during the conveying process, thereby maintaining the efficient transport of the powder.

[0077] The static eliminator 70 is a conductor. One end of the static eliminator 70 is connected to the delivery pipe 10, and the other end is used for grounding.

[0078] The conductor has good electrical conductivity and can be made of metals such as copper or aluminum. These conductors can quickly remove static charge from the powder conveying device 100.

[0079] In some specific embodiments, one end of the static eliminator 70 is connected to the main pipe 11, and the other end is grounded. Through this grounding connection, static charge can be safely conducted to the ground along the conductive path, avoiding accumulation in the main pipe 11, reducing the possibility of powder adsorbing in the main pipe 11 due to static electricity, reducing the risk of blockage, and improving the powder conveying efficiency.

[0080] Optionally, the static eliminator 70 can be installed at multiple locations on the main pipeline 11, such as at the inlet 111, outlet 112, or bends and branch points. These locations are prone to static electricity generation, and adding the static eliminator 70 can reduce the risk of static electricity.

[0081] According to some optional embodiments, in combination Figure 1 The static eliminator 70 is a wire with one end sleeved on the conveying pipe 10. The conveying pipe 10 is a conductor, and the wire is in contact with the conveying pipe 10.

[0082] Static electricity can be effectively released by setting up wires.

[0083] In some alternative embodiments, one end of the wire is fixed to the delivery pipe 10 by a clamp, collar, or the like to ensure good contact between the wire and the delivery pipe 10.

[0084] Optionally, conductive paste or conductive adhesive can be applied to the contact points between the wire and the delivery tube 10 to enhance conductivity.

[0085] Alternatively, the other end of the conductor can be connected to the ground grid or other suitable grounding point via a grounding wire. In this way, static charge can be quickly conducted to the ground through the circuit formed by the conductor and the conduit 10, preventing static electricity accumulation.

[0086] like Figure 1 As shown, according to some optional embodiments of the present invention, the powder conveying device 100 further includes: an electromagnetic iron remover 80, used to remove iron from the powder, the electromagnetic iron remover 80 being located downstream of the negative pressure machine 20.

[0087] It is known that the electromagnetic iron remover 80 uses an electromagnetic field to attract and capture ferromagnetic impurities such as iron filings and rust in the powder, thereby purifying the powder.

[0088] By placing the electromagnetic iron separator 80 downstream of the negative pressure machine 20, iron impurities can be removed uniformly after powder transportation, reducing the entry of iron impurities into downstream equipment, reducing equipment wear and failure risk, extending equipment service life, and reducing maintenance costs.

[0089] The following is for reference. Figure 1 - Figure 2 The powder conveying device 100 according to an embodiment of the present invention will be described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0090] Reference Figure 1 The powder conveying device 100 includes: a conveying pipe 10, a negative pressure machine 20, an air source component 30, an air replenishment regulating valve 40, a feed hopper 50, a discharge valve 60, an electrostatic eliminator 70, and an electromagnetic iron remover 80.

[0091] The delivery pipe 10 includes a main pipe 11 and a branch pipe 13.

[0092] The two ends of the main pipe 11 are the inlet 111 and the outlet 112, respectively.

[0093] The main pipeline 11 is also equipped with a positive pressure port 113 and a gas supply port 114.

[0094] Branch pipe 13 includes: gas supply pipe 131. One end of gas supply pipe 131 is connected to main pipe 11, and the other end is gas supply port 114. Gas supply pipe 131 is connected to the top of main pipe 11 so that gas is supplied from the top of main pipe 11.

[0095] Reference Figure 2 The angle between the air supply pipe 131 and the main pipe 11 is α, which satisfies 30°≤α≤60°.

[0096] Reference Figure 2 The length of the air supply tube 131 is L, which satisfies 30mm≤L≤50mm.

[0097] The air supply pipe 131 is installed upstream of the main pipeline 11, from the air supply port 114 to the main pipeline 11.

[0098] The air supply regulating valve 40 is set to correspond to the air supply port 114 to adjust the size of the air supply port 114.

[0099] The lower opening of the feed hopper 50 is connected to the feed inlet 111.

[0100] The discharge valve 60 is located at the feed inlet 111 to control the opening and closing of the discharge port.

[0101] The negative pressure machine 20 is connected to the discharge port 112 to suck out the powder.

[0102] The gas source unit 30 is connected to the positive pressure port 113 to output gas to the delivery pipe 10. The gas source unit 30 is an air compressor.

[0103] The static eliminator 70 is a wire with one end sleeved on the conveying pipe 10. The conveying pipe 10 is a conductor, and the wire is in contact with the conveying pipe 10.

[0104] Electromagnetic iron separator 80 is used to remove iron from powder. Electromagnetic iron separator 80 is located downstream of negative pressure machine 20.

[0105] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0106] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A powder conveying device, characterized in that, include: A conveying pipe is used to convey powder. One end of the conveying pipe is a feed inlet and the other end is a discharge outlet. The conveying pipe is also provided with a positive pressure port and an air supply port. A negative pressure machine, connected to the discharge port, to suck out the powder; A gas source component is connected to the positive pressure port to output gas to the delivery pipe.

2. The powder delivery device of claim 1, wherein Also includes: An air supply regulating valve is provided corresponding to the air supply port to adjust the size of the air supply port.

3. The powder delivery device of claim 1, wherein The conveying pipe includes a main pipe and branch pipes, with the inlet and outlet of the main pipe being the two ends of the main pipe, respectively. The branch pipe includes a gas supply pipe, one end of which is connected to the main pipe and the other end is the gas supply port. The gas supply pipe is connected to the top of the main pipe so that gas can be supplied from the top of the main pipe.

4. The powder delivery device of claim 3, wherein The angle between the air supply pipe and the main pipe is an acute angle. The air supply pipe is positioned upstream of the main pipeline from the air supply port to the main pipeline.

5. The powder delivery device of claim 4, wherein The included angle α between the air supply pipe and the main pipe satisfies 30°≤α≤60°.

6. The powder delivery device of claim 3, wherein The length of the air supply pipe is L, which satisfies 30mm≤L≤50mm.

7. The powder delivery device of claim 1, wherein Also includes: The filter element is installed corresponding to the air supply port.

8. The powder delivery device of claim 7, wherein, The filter element is a dustproof mesh.

9. The powder delivery device of claim 1, wherein, Also includes: A feed hopper, the lower opening of which is connected to the feed inlet; A discharge valve is provided at the feed inlet to control the opening and closing of the discharge port.

10. The powder delivery device of claim 1, wherein The air source component is an air compressor.

11. The powder delivery device of claim 1, wherein Also includes: An electrostatic eliminator is a conductor, one end of which is connected to the conveying pipe, and the other end is used for grounding.

12. The powder delivery device of claim 11, wherein, The static eliminator is a wire with one end sleeved on the conveying pipe, the conveying pipe is a conductor, and the wire is in contact with the conveying pipe.

13. The powder delivery device of any one of claims 1-12, wherein, The powder conveying device further includes: An electromagnetic iron remover is used to remove iron from the powder, and the electromagnetic iron remover is located downstream of the negative pressure machine.

Images