Powder hopper device

Abstract

The application relates to a powder hopper device. The powder hopper device comprises a bin body, a stirring unit, a vibrating unit and an electrostatic elimination unit; a discharge part is arranged at the bottom of the bin body through a flexible interface, and the discharge part is surrounded by a discharge port; at least a part of the stirring unit is arranged in the bin body and can rotate; the vibrating unit is arranged on the discharge part and can vibrate the discharge part; and the electrostatic elimination unit is arranged on the bin body and can remove static electricity on powder in the bin body. The powder hopper device can stir the powder in the bin body by additionally arranging the stirring unit on the bin body, can effectively make the discharge part vibrate by additionally arranging the vibrating unit on the discharge pipe of the bin body and arranging the discharge part at the bottom of the bin body through the flexible interface, can promote the powder to be smoothly discharged by vibration, and can timely remove static electricity on the powder in the stirring and discharging process by additionally arranging the electrostatic elimination unit on the bin body, so that the powder is prevented from being agglomerated or attached due to the static electricity.

Description

Technical Field

[0001] This application relates to the field of powder processing technology, and in particular to a powder hopper device. Background Technology

[0002] Plastic powders (including plastic powders, ultrafine plastic powders, resin powders, etc.) are synthetic polymer compounds, also known as polymers or macromolecules, commonly referred to as plastics or resins, and possess the characteristic of being able to freely change their shape and form. Plastics are materials produced from monomer raw materials through synthesis or condensation polymerization reactions, mainly composed of synthetic resins and additives such as fillers, plasticizers, stabilizers, lubricants, and colorants. They are generally classified into two categories: thermoplastic and thermosetting.

[0003] In the plastic powder processing, the powder needs to be fed through a funnel. However, during feeding, the powder may agglomerate due to moisture. Agglomerated powder can easily clog the funnel, resulting in poor feeding and requiring frequent unclogging, thus reducing feeding efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a powder hopper device to address the aforementioned technical problems.

[0005] A powder hopper device, comprising:

[0006] The bin body has a discharge section installed at its bottom via a flexible interface, and the discharge section is surrounded by a discharge port.

[0007] A stirring unit, at least a portion of which is disposed within the chamber and is capable of rotation;

[0008] A vibration unit, wherein the vibration unit is disposed on the discharge section and is capable of causing the discharge section to vibrate; and

[0009] An electrostatic elimination unit is provided on the chamber body and is capable of removing static electricity from the powder in the chamber body.

[0010] In one embodiment, the stirring unit includes a stirring frame and a plurality of intermediate connecting rods. The stirring frame is a planar structure adapted to the longitudinal section of the chamber. A portion of the intermediate connecting rods are spaced apart on the stirring frame in the vertical direction, and the remaining portion of the intermediate connecting rods are spaced apart on the stirring frame in the horizontal direction.

[0011] In one embodiment, the powder hopper device further includes a drive unit disposed on the hopper body, the drive unit being connected to the stirring unit and capable of driving the stirring unit to rotate.

[0012] In one embodiment, the drive unit includes a drive motor and a reducer. The housing of the reducer is disposed on the chamber body. The power input end of the reducer is connected to the power output end of the drive motor, and the power output end of the reducer is connected to the stirring unit.

[0013] In one embodiment, the chamber also has an air inlet; the static elimination unit includes an ion bar, the air outlet of which faces the air inlet of the chamber.

[0014] In one embodiment, the top of the hopper is provided with a feeding section, and the feeding section is surrounded by a feeding port; the powder hopper device further includes a material control unit, at least a portion of which is provided on the feeding section and is capable of adjusting the feeding speed of the hopper at the feeding port.

[0015] In one embodiment, the material control unit includes a material leakage section and an adjustment section connected together. The material leakage section is rotatably disposed in the feeding port and has a material leakage hole. The adjustment section is disposed on the feeding section and can drive the material leakage section to rotate so that the material control unit switches between a first feeding mode and a second feeding mode.

[0016] In the first feeding mode, the discharge hole is close to the circumferential inner wall of the feeding part, while in the second feeding mode, the discharge hole is far away from the circumferential inner wall of the feeding part.

[0017] In one embodiment, the material control unit further includes a sealing part, which is disposed on the feeding part and is sealed through by the adjustment part.

[0018] In one embodiment, the inner wall of the hopper is provided with an anti-sticking coating.

[0019] In one embodiment, the powder hopper device further includes a support base, and the hopper body is disposed on the support base.

[0020] The aforementioned powder hopper device, by adding a stirring unit to the hopper body, can agitate the powder within the hopper. Simultaneously, a vibration unit is added to the discharge pipe of the hopper body, and the discharge section is installed at the bottom of the hopper body via a flexible interface. This effectively vibrates the discharge section, promoting smooth powder discharge and further resolving the problem of poor discharge caused by agglomeration, preventing adhesion during the discharge process. Furthermore, by adding an electrostatic elimination unit to the hopper body, static electricity on the powder can be promptly removed during agitation and discharge, preventing agglomeration or adhesion due to static electricity. Therefore, the powder hopper device of this application, through the cooperation of the stirring unit, vibration unit, and electrostatic elimination unit, and the installation of the discharge section on the hopper body via a flexible interface, can effectively prevent powder from clogging the hopper body due to agglomeration, ensuring smooth discharge. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a powder hopper device provided in an embodiment of this application.

[0022] Figure 2 This is a cross-sectional view of a powder hopper device provided in an embodiment of this application.

[0023] Figure 3 for Figure 1 A schematic diagram of the material control unit of the provided powder hopper device.

[0024] The labels in the attached diagram are explained as follows:

[0025] 10. Powder hopper device; 100. Bin body; 110a. Funnel; 110b. Top cover; 110. Discharge section; 120. Flexible interface; 130. Feeding section; 140. Anti-sticking coating; 200. Stirring unit; 210. Stirring frame; 220. Intermediate connecting rod; 300. Static elimination unit; 400. Vibration unit; 500. Drive unit; 510. Drive motor; 520. Reducer; 521. Connecting flange; 522. Coupling; 523. Bearing; 600. Material control unit; 610. Discharge section; 611. Discharge hole; 620. Adjustment section; 630. Sealing section; 700. Support base; 710. Support plate; 720. Support leg. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1 and Figure 2 , Figure 1 A schematic diagram of the powder hopper device 10 according to one embodiment of this application is shown. Figure 2A cross-sectional view of a powder hopper device 10 according to an embodiment of this application is shown. The powder hopper device 10 provided in an embodiment of this application includes a hopper body 100, a stirring unit 200, a vibration unit 400, and a static elimination unit 300. A discharge section 110 is installed at the bottom of the hopper body 100 through a flexible interface 120, and the discharge section 110 is surrounded by a discharge port. At least a portion of the stirring unit 200 is disposed in the hopper body 100 and is rotatable. The vibration unit 400 is disposed on the discharge section 110 and is capable of vibrating the discharge section 110. The static elimination unit 300 is disposed on the hopper body 100 and is capable of removing static electricity from the powder in the hopper body 100.

[0033] This powder hopper device 10 can be applied in the field of plastic powder processing for feeding plastic powder. Of course, this powder hopper device 10 can also be applied in the fields of pharmaceuticals, food processing, and metal powder metallurgy.

[0034] In the plastic powder processing, when the material is discharged, the stirring unit 200 rotates to stir the powder material (hereinafter referred to as "powder") in the hopper 100, preventing the powder from clumping or sticking together. At the same time, the vibration unit 400 also vibrates the discharge section 110 of the hopper 100, so that the powder can be quickly discharged from the discharge section 110 of the hopper 100. In order to increase the vibration effect of the vibration unit 400 on the discharge section 110, the discharge section 110 is installed on the hopper 100 through the flexible interface 120. The flexible characteristics of the flexible interface 120 can be used to make the discharge section 110 shake significantly under the action of the vibration unit 400, which can promote the smooth discharge of the powder, further solve the problem of poor discharge caused by clumping, and avoid the powder from sticking together during the discharge process.

[0035] The flexible interface 120 can be made of rubber, or it can be made of metal and have a twistable structure. The discharge part 110 can be made of a metal material with high hardness and strength (such as stainless steel) to facilitate the installation of the vibration unit 400. The discharge part 110 will swing as a whole under the vibration of the vibration unit 400, which can facilitate the smooth discharge of powder.

[0036] Considering that static electricity is easily generated during the mixing and feeding process of powder due to friction between the powder and the mixing unit 200 and the hopper 100, causing the powder to be adsorbed on the inner wall of the hopper 100 and the mixing unit 200, thus affecting the mixing and feeding effect, this application provides a static electricity elimination unit 300 on the hopper 100. During feeding, the static electricity elimination unit 300 can be used to remove static electricity from the powder in the hopper 100, preventing the powder from clumping or adhering due to static electricity.

[0037] The powder hopper device 10 provided in this application, by adding a stirring unit 200 to the hopper body 100, can use the stirring unit 200 to stir the powder in the hopper body 100. At the same time, a vibration unit 400 is added to the discharge pipe of the hopper body 100 and the discharge part 110 is installed at the bottom of the hopper body 100 through a flexible interface 120, which can effectively make the discharge part 110 vibrate. The vibration promotes the smooth discharge of powder, further solving the problem of poor discharge caused by agglomeration and avoiding adhesion during the discharge process. In addition, by adding an electrostatic elimination unit 300 to the hopper body 100, static electricity on the powder can be removed in time during stirring and discharge, preventing the powder from agglomerating or adhering due to static electricity. As can be seen, the powder hopper device 10 of this application, through the cooperation of the stirring unit 200, the vibration unit 400 and the static elimination unit 300, and the installation of the discharge part 110 on the hopper body 100 through the flexible interface 120, can effectively prevent the powder from clogging the hopper body 100 due to agglomeration, and ensure smooth material discharge.

[0038] The hopper 100, as the main body of the device, primarily functions to feed and discharge materials. In one embodiment, as... Figure 1 As shown, the hopper 100 may include a funnel 110a and a top cover 110b. The bottom of the funnel 110a has a discharge port, and the top cover 110b is fitted over the top opening of the funnel 110a and has a feeding port. An electrostatic elimination unit 300 is disposed on the top cover 110b, and at least a portion of the stirring unit 200 is disposed in the funnel 110a. Powder can be added through the feeding port and discharged from the discharge port. In one embodiment, the top cover 110b is provided with a feeding section 130, and the feeding section 130 surrounds the feeding port.

[0039] Among them, the funnel 110a can be an inverted cone-shaped funnel, which facilitates the discharge of powder from the outlet at the bottom of the silo 100.

[0040] Optionally, such as Figure 2 As shown, the inner wall of the funnel 110a of the hopper 100 is provided with an anti-sticking coating 140. The anti-sticking coating 140 further effectively prevents powder from adhering to the inner wall of the funnel 110a, ensuring smooth material flow. The anti-sticking coating 140 can be made of polytetrafluoroethylene (PTFE), a synthetic polymer material in which fluorine replaces all hydrogen atoms in polyethylene. It is generally referred to as a "non-stick coating" or "easy-to-clean material," possessing resistance to acids, alkalis, and various organic solvents. Simultaneously, PTFE exhibits high-temperature resistance and an extremely low coefficient of friction, making it suitable for lubrication and ideal for easy-to-clean water pipe interiors. The anti-sticking coating 140 can be applied to the inner wall of the funnel 110a by spraying or other methods. Alternatively, the inner wall of the top cover 110b can also be provided with an anti-sticking coating 140.

[0041] The stirring unit 200 mainly functions to stir the powder. In one embodiment, such as... Figure 2 As shown, the mixing unit 200 includes a mixing frame 210 and multiple intermediate connecting rods 220. The mixing frame 210 is a planar structure adapted to the longitudinal section of the silo 100. A portion of the intermediate connecting rods 220 are spaced vertically on the mixing frame 210, and the remaining intermediate connecting rods 220 are spaced horizontally on the mixing frame 210. By placing the mixing frame 210 in a planar structure, excessive space is avoided in the silo 100 by the mixing unit 200. Its dimensions are appropriately set according to the longitudinal section of the silo 100, allowing the mixing frame 210 to reach as much of the space in the silo 100 as possible, enabling effective and comprehensive mixing of the powder in the silo 100. For example, as... Figure 2 As shown, if the hopper of the bin 100 is generally conical, then the mixing frame 210 is generally inverted trapezoidal. In addition, multiple intermediate connecting rods 220 are arranged at intervals on the mixing frame 210 along the vertical and horizontal directions, which can reduce the weight of the mixing unit 200 and also mix the powder in the bin 100.

[0042] The number of intermediate connecting rods 220 in the vertical and horizontal directions can be set according to the internal dimensions of the compartment 100, for example, as follows. Figure 2 As shown, five intermediate connecting rods 220 are arranged at intervals along the vertical direction on the silo body 100 and three intermediate connecting rods 220 are arranged at intervals along the horizontal direction on the silo body 100. This application does not impose specific limitations on this.

[0043] The intermediate connecting rod 220 and the stirring frame 210 can be an integral structure, and the two can be connected by casting, 3D printing or other methods; of course, the intermediate connecting rod 220 and the stirring frame 210 can also be a separate structure, and the two can be adjacent by welding, bonding or other methods.

[0044] To achieve automatic stirring in the stirring unit 200, such as Figure 1 and Figure 2 As shown, in one embodiment, the powder hopper device 10 further includes a drive unit 500 disposed on the hopper body 100. The drive unit 500 is connected to the stirring unit 200 and can drive the stirring unit 200 to rotate. In one implementation, the drive unit 500 can be disposed on the upper cover 110b of the hopper body 100 and connected to the vertical intermediate connecting rod 220 of the stirring unit 200. The installation of the drive unit 500 eliminates the need for manual stirring, thereby improving the automation level of the entire device.

[0045] Specifically, such as Figure 2As shown, the drive unit 500 includes a drive motor 510 and a reducer 520. The housing of the reducer 520 is mounted on the upper cover 110b of the hopper 100. The power input terminal of the reducer 520 is connected to the power output terminal of the drive motor 510, and the power output terminal of the reducer 520 is connected to the stirring unit 200. This drive unit 500 can provide stable power to the stirring unit 200, enabling the stirring unit 200 to continuously and stably and thoroughly stir the powder in the hopper 100.

[0046] As an example, such as Figure 2 As shown, the housing of the reducer 520 is mounted on the upper cover 110b of the housing 100 via a connecting flange 521. This facilitates the assembly and disassembly of the drive unit 500.

[0047] As an example, such as Figure 2 As shown, the power output end of the reducer 520 can be connected to the intermediate connecting rod 220 of the stirring unit 200 via a coupling 522. A bearing 523 may be provided between the coupling 522 and the connecting flange 521.

[0048] The static eliminator unit 300 is mainly used to remove static electricity from powder materials. In one embodiment, the upper cover 110b of the hopper 100 also has an air inlet. The static eliminator unit 300 includes an ionizing air bar, with the air outlet of the ionizing air bar facing the air inlet of the hopper 100. Ionizing air can be blown into the hopper 100 by the ionizing air bar, thereby removing static electricity from the powder materials. Compared with other types of static eliminators, the static eliminator method of this application is non-contact, avoiding contamination of the powder materials, and can also eliminate static electricity over a large area, effectively removing static electricity from the powder materials.

[0049] The vibration unit 400 is mainly used to generate vibration for the discharge section 110. In one embodiment, the vibration unit 400 may include a vibration motor.

[0050] In some embodiments of this application, such as Figures 1 to 3 As shown, the powder hopper device 10 also includes a material control unit 600. At least a portion of the material control unit 600 is disposed on the feeding section 130 and can adjust the feeding speed of the hopper 100 at the feeding port. The material control unit 600 can adjust the feeding speed to accommodate powders of different particle sizes. When there is too much powder in the hopper 100, the feeding speed can be adjusted to avoid the problem of increased stirring force due to accumulation.

[0051] Furthermore, in one embodiment, as Figure 2 and Figure 3As shown, the material control unit 600 may include a connected material discharge section 610 and an adjustment section 620. The material discharge section 610 is rotatably disposed in the feeding port and has a material discharge hole 611. The adjustment section 620 is disposed on the feeding section 130 and can drive the material discharge section 610 to rotate so that the material control unit 600 switches between a first feeding mode and a second feeding mode. In the first feeding mode, the material discharge hole 611 is close to the circumferential inner wall of the feeding section 130, and in the second feeding mode, the material discharge hole 611 is away from the circumferential inner wall of the feeding section 130. The position of the material leakage hole 611 of the material leakage section 610 can be adjusted by rotating the adjustment part 620, which is equivalent to adjusting the cross-sectional area of ​​the feeding port. In the first feeding mode, since the material leakage hole 611 is close to the circumferential inner wall of the feeding part 130, the cross-sectional area of ​​the feeding port is minimized. In the second feeding mode, since the material leakage hole 611 is far away from the circumferential inner wall of the feeding part 130, the material leakage hole 611 is exposed in the feeding port, which maximizes the cross-sectional area of ​​the feeding port.

[0052] A gap may be provided between the outer surface of the material leakage section 610 and the inner surface of the material feeding section 130 (see [reference]). Figure 3 This gap always exists, regardless of whether it is in the first or second feeding mode. The size of the gap can be set according to requirements.

[0053] Of course, there may be no gap between the outer surface of the discharge section 610 and the inner surface of the feeding section 130. In this case, in the first feeding mode, the feeding port is completely blocked by the discharge section 610, and material cannot be fed. The size of the discharge section 610 needs to be compatible with the feeding port. For example, if the cross-section of the feeding port is circular, the funnel 110a can be spherical; or if the cross-section of the feeding port is elliptical, the funnel 110a can be rugby ball-shaped.

[0054] The circumferential sidewall of the hopper 100 has a through hole through which the adjustment part 620 passes. However, there is usually a gap between the adjustment part 620 and the wall of the through hole, which allows powder in the hopper 100 to escape, polluting the environment or harming the health of operators. In one embodiment, as... Figure 2 As shown, the material control unit 600 also includes a sealing part 630, which is disposed on the feeding part 130 and through which the adjusting part 620 passes for sealing. The sealing part 630 can prevent powder from escaping from the hopper 100. The sealing part 630 can be disposed on the wall of the through hole or on the outer surface of the hopper 100. The sealing part 630 can be a rubber ring or a rubber sheet. The sealing part 630 can be fixed by means of bonding, screwing, etc.

[0055] In some embodiments of this application, such as Figure 1As shown, the powder hopper device 10 also includes a support base 700, on which the hopper body 100 is mounted. The support base 700 supports the hopper body 100, facilitating the connection of the discharge port at the bottom of the hopper body 100 with external pipes or external equipment.

[0056] In one embodiment, such as Figure 1 As shown, the support base 700 includes a support plate 710 and multiple support legs 720. The support legs 720 support the support plate 710, and the hopper 100 sits on the support plate 710. The support base 700 has a simple structure and is easy to manufacture and process. The number of support legs 720 can be set according to requirements, for example, as... Figure 1 As shown, a support leg 720 is provided at each corner of the support plate 710.

[0057] 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.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A powder hopper device, characterized in that, include: The bin body has a discharge section installed at its bottom via a flexible interface, and the discharge section is surrounded by a discharge port. A stirring unit, at least a portion of which is disposed within the chamber and is capable of rotation; A vibration unit is provided on the discharge section and is capable of causing the discharge section to vibrate. and An electrostatic elimination unit is provided on the chamber and is capable of removing static electricity from the powder in the chamber.

2. The powder hopper device according to claim 1, characterized in that, The stirring unit includes a stirring frame and a plurality of intermediate connecting rods. The stirring frame is configured as a planar structure adapted to the longitudinal section of the chamber. A portion of the intermediate connecting rods are spaced apart on the stirring frame in the vertical direction, and the remaining portion of the intermediate connecting rods are spaced apart on the stirring frame in the horizontal direction.

3. The powder hopper device according to claim 1, characterized in that, The powder hopper device also includes a drive unit disposed on the hopper body, the drive unit being connected to the stirring unit and capable of driving the stirring unit to rotate.

4. The powder hopper device according to claim 3, characterized in that, The drive unit includes a drive motor and a reducer. The housing of the reducer is disposed on the chamber body. The power input end of the reducer is connected to the power output end of the drive motor, and the power output end of the reducer is connected to the stirring unit.

5. The powder hopper device according to claim 1, characterized in that, The chamber also has an air inlet; the static electricity elimination unit includes an ion bar, the air outlet of which is directly opposite the air inlet of the chamber.

6. The powder hopper device according to claim 1, characterized in that, The top of the hopper is provided with a feeding section, and the feeding section is surrounded by a feeding port; the powder hopper device also includes a material control unit, at least a part of which is provided on the feeding section and can adjust the feeding speed of the hopper at the feeding port.

7. The powder hopper device according to claim 6, characterized in that, The material control unit includes a material leakage section and an adjustment section connected together. The material leakage section is rotatably disposed in the feeding port and has a material leakage hole. The adjustment section is disposed on the feeding section and can drive the material leakage section to rotate so that the material control unit can switch between a first feeding mode and a second feeding mode. There is no gap between the outer surface of the material leakage part and the inner surface of the material feeding part. In the first feeding mode, the material leakage hole is close to the circumferential inner wall of the material feeding part so that the feeding port is completely blocked by the material leakage and cannot feed material. In the second feeding mode, the material leakage hole is away from the circumferential inner wall of the material feeding part so that the material leakage hole is exposed in the feeding port.

8. The powder hopper device according to claim 7, characterized in that, The material control unit also includes a sealing part, which is disposed on the feeding part and is sealed through by the adjustment part.

9. The powder hopper device according to claim 1, characterized in that, The inner wall of the hopper is provided with an anti-sticking coating.

10. The powder hopper device according to any one of claims 1 to 9, characterized in that, The powder hopper device also includes a support base, and the hopper body is disposed on the support base.

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