A powder precision valve device and a control method thereof

Abstract

This invention relates to a precision valve device and control method for powder materials. The device includes: a mounting main board, a powder hopper, and a powder inlet hopper. The powder hopper is fixedly disposed on one side of the mounting main board, and the powder inlet hopper is connected to the powder hopper. A powder-throwing shaft is disposed inside the powder hopper. An upper wear-resistant ring is disposed at the bottom of the powder hopper. A lower stop disc is fixedly disposed at the bottom of the powder-throwing shaft after passing through the upper wear-resistant ring. The gap between the upper wear-resistant ring and the lower stop disc forms a powder outlet. A first drive mechanism for driving the powder-throwing shaft to rotate is disposed on one side of the top of the mounting main board. A second drive mechanism for driving the first drive mechanism to move up and down along the mounting main board, thereby causing the lower stop disc at the bottom of the powder-throwing shaft to move up and down, and thus adjusting the size of the powder outlet. This invention can improve powder dispensing accuracy and efficiency, and avoid material jamming.

Description

Technical Field

[0001] This invention relates to the field of powder processing equipment technology, and in particular to a precision valve device for powder and its control method. Background Technology

[0002] Currently, mineral powder processing equipment typically uses a single dispensing valve, which cannot accommodate powder outputs of different weights.

[0003] The powder valve in existing mineral powder processing equipment adjusts the powder output by pre-setting a gap and adjusting the size of the gap.

[0004] For large-gram-weight powders, the powder output precision is low; for small-gram-weight powders, the powder output precision is high, but the powder output speed is slow and the working efficiency is low.

[0005] The powder is discharged naturally, making it difficult to pass through gaps and preventing ultra-precise powder dispensing. Furthermore, it does not dispense powder at low weights, cannot pass through gaps, and is prone to jamming.

[0006] In addition, existing powder processing devices use rigid stirring blades, which are prone to jamming and stalling. Summary of the Invention

[0007] The main objective of this invention is to propose a precision valve device for powder and its control method, which aims to improve powder output accuracy and efficiency, and avoid material jamming.

[0008] To achieve the above objectives, the present invention proposes a precision valve device for powder materials, comprising: a mounting main board, a powder hopper, and a powder inlet hopper. The powder hopper is fixedly disposed on one side of the mounting main board, and the powder inlet hopper is connected to the powder hopper. A powder-throwing shaft is disposed inside the powder hopper, and an upper wear-resistant ring is disposed at the bottom of the powder hopper. A lower baffle disc is fixedly disposed at the bottom of the powder-throwing shaft after passing through the upper wear-resistant ring. The gap between the upper wear-resistant ring and the lower baffle disc forms a powder outlet. The top side of the mounting motherboard is provided with a first drive mechanism for driving the powder-spinning shaft to rotate, and the other top side of the mounting motherboard is provided with a second drive mechanism for driving the first drive mechanism to move up and down along the mounting motherboard, thereby driving the lower baffle disc at the bottom of the powder-spinning shaft to move up and down, and thus adjusting the size of the powder outlet.

[0009] A further technical solution of the present invention is that the first driving mechanism includes a powder-spinning speed-regulating motor, a bearing limiting frame, and a slider. The powder-spinning speed-regulating motor is fixedly mounted on the bearing limiting frame. The bearing limiting frame is slidably connected to the mounting main board through the slider. The bearing limiting frame is connected to the output end of the second driving mechanism. The output end of the powder-spinning speed-regulating motor is provided with a coupling. The coupling is detachably connected to the powder-spinning shaft through a hexagonal male and female connector.

[0010] A further technical solution of the present invention is that the second driving mechanism includes a valve opening speed-regulating motor, a bearing, and an eccentric shaft. The output end of the valve opening speed-regulating motor is connected to the input end of the eccentric shaft, and the output end of the eccentric shaft is provided with the bearing, which is disposed within the bearing limiting frame.

[0011] A further technical solution of the present invention is that the valve opening speed regulating motor is equipped with an origin sensor and an origin sensor baffle.

[0012] A further technical solution of the present invention is that the powder precision valve device further includes a powder weighing module disposed below the lower baffle disc, and a control system connected to the powder weighing module, the powder-spinning speed-regulating motor, and the valve opening speed-regulating motor; the powder weighing module includes a weighing body and a weighing container disposed on the weighing body.

[0013] A further technical solution of the present invention is that a valve clamp is provided on the mounting motherboard, the powder hopper is provided on the valve clamp, and a vibration motor is also provided at the bottom of the powder hopper on the upper wear-resistant ring.

[0014] A further technical solution of the present invention is that a powder hopper sensor is provided on the mounting plate.

[0015] A further technical solution of the present invention is that a stirring spring is provided at the bottom of the powder-spinning shaft.

[0016] A further technical solution of the present invention is that a thrust bearing is provided at the top of the powder-spinning shaft, and a return spring for the powder-spinning shaft is provided inside the thrust bearing.

[0017] To achieve the above objectives, the present invention also proposes a control method for a precision valve device for powder materials. The method is applied to the precision valve device for powder materials as described above, and includes the following steps: Step S10: Adjust the powder outlet formed by the gap between the upper wear-resistant ring and the lower baffle disc to close. Step S20: Add a predetermined amount of powder from the powder inlet hopper; Step S30: Start the first drive mechanism to drive the powder-spinning shaft to rotate and stir the powder in the powder hopper. At the same time, start the second drive mechanism to control the first drive mechanism to move in the direction of movement, thereby driving the powder-spinning shaft to move downward, adjusting the powder outlet to the first level size, and throwing the powder from the powder outlet into the weighing container. Step S40: When the weighing module detects that the amount of powder discharged from the weighing container has reached the first predetermined value, the second drive mechanism is used to adjust and reduce the powder outlet to the second stage size. At the same time, the first drive mechanism is used to adjust the rotation speed of the powder-spinning shaft to grind and discharge powder. In step S50, after the powder is dispensed, the first drive mechanism is controlled to move upward by the second drive mechanism, which in turn drives the powder-spinning shaft to move upward until the powder outlet is closed.

[0018] The beneficial effects of the precision valve device and control method for powder materials of the present invention are: The present invention, through the above technical solution, includes: a mounting motherboard, a powder hopper, and a powder inlet hopper. The powder hopper is fixedly disposed on one side of the mounting motherboard, and the powder inlet hopper is connected to the powder hopper. A powder-spinning shaft is disposed inside the powder hopper. An upper wear-resistant ring is disposed at the bottom of the powder hopper. A lower baffle disc is fixedly disposed at the bottom of the powder-spinning shaft after passing through the upper wear-resistant ring. The gap between the upper wear-resistant ring and the lower baffle disc forms a powder outlet. A first drive mechanism for driving the powder-spinning shaft to rotate is disposed on one side of the top of the mounting motherboard. A second drive mechanism for driving the first drive mechanism to move up and down along the mounting motherboard, thereby driving the lower baffle disc at the bottom of the powder-spinning shaft to move up and down, and thus adjusting the size of the powder outlet, can improve the powder dispensing accuracy and powder dispensing efficiency, and avoid material jamming. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the precision valve device for powder materials of the present invention; Figure 2 This is a schematic diagram of the overall structure of a preferred embodiment of the powder precision valve device of the present invention from another angle; Figure 3 This is a schematic diagram of the second drive mechanism; Figure 4 This is a schematic diagram of the second drive mechanism from another angle; Figure 5 This is a schematic diagram of the first drive mechanism; Figure 6 This is a schematic diagram of the powder-spinning shaft; Figure 7 This is a schematic diagram of the upper wear-resistant ring; Figure 8 This is a structural diagram of the powder silo; Figure 9 This is a schematic diagram of a powder silo with a vibration motor.

[0020] Explanation of icon numbers: Install the following components: 1. Mainboard; 2. Powder hopper; 3. Powder inlet; 4. Powder hopper outlet; 5. Spinning shaft; 6. Upper wear-resistant ring; 7. Lower baffle disc; 8. Powder outlet; 9. Center support hole; 10. Spinning speed control motor; 11. Bearing limit frame; 12. Slider; 13. Coupling; 14. Hexagonal male and female connector; 15. Hexagonal male and female connector; 16. Slide rail; 17. Valve opening speed control motor; 18. Bearing; 19. Eccentric shaft; 20. Origin sensor; 21. Origin sensor baffle; 22. Valve clamp; 23. Vibration motor; 24. Powder hopper sensor; 25. Stirring spring.

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely some embodiments of the present invention and are not intended to limit the present invention. All other embodiments derived from the embodiments of the present invention without inventive design are within the scope of protection of the present invention.

[0023] Please refer to Figures 1 to 9 The present invention proposes a precision valve device for powder materials. A preferred embodiment of the precision valve device for powder materials of the present invention includes a mounting main board 1, a powder hopper 2, and a powder inlet hopper 3.

[0024] The powder hopper 2 is fixedly mounted on one side of the mounting motherboard 1, and the powder inlet hopper 3 is connected to the powder hopper 2. The top of the powder hopper 2 has a powder inlet 4, and the powder in the powder inlet hopper 3 enters the powder hopper 2 through the powder inlet 4.

[0025] The powder hopper 2 is equipped with a powder-spinning shaft 5. The bottom of the powder hopper 2 is equipped with an upper wear-resistant ring 6. The bottom of the powder-spinning shaft 5 passes through the upper wear-resistant ring 6 and is fixedly equipped with a lower baffle disc 7. The gap between the upper wear-resistant ring 6 and the lower baffle disc 7 forms a powder outlet 8. The gap between the upper wear-resistant ring 6 and the lower baffle disc 7 acts like a valve. The larger the gap between the upper wear-resistant ring 6 and the lower baffle disc 7, that is, the larger the powder outlet 8, the larger the valve opening. The smaller the gap between the upper wear-resistant ring 6 and the lower baffle disc 7, that is, the smaller the powder outlet 8, the smaller the valve opening.

[0026] In this embodiment, the bottom of the upper wear-resistant retaining ring is provided with a central support hole 9, and the bottom of the powder-spinning shaft 5 passes through the central support hole 9 and connects to the lower retaining disc 7. The design of the central support hole 9 ensures that the powder-spinning shaft 5 remains in a centered position.

[0027] The top side of the mounting motherboard 1 is provided with a first drive mechanism for driving the powder-spinning shaft 5 to rotate, and the other side of the top of the mounting motherboard 1 is provided with a second drive mechanism for driving the first drive mechanism to move up and down along the mounting motherboard 1, so as to drive the lower stop disc 7 at the bottom of the powder-spinning shaft 5 to move up and down, thereby adjusting the size of the powder outlet 8.

[0028] In this embodiment, the size of the powder outlet 8 is adjusted by the second driving mechanism, and the rotation speed of the powder-spinning shaft 5 is adjusted by the first driving mechanism. These two mechanisms work together to achieve the following: When discharging small-weight powder, the gap between the upper wear-resistant ring 6 and the lower baffle disc 7 forms the smallest valve at the powder outlet 8, and the powder-spinning shaft 5 rotates slowly, extruding the powder. When discharging large-weight powder, the gap between the upper wear-resistant ring 6 and the lower baffle disc 7 forms the largest valve at the powder outlet 8, and the powder-spinning shaft 5 rotates at high speed, extruding the powder. During ultra-precision powder discharging, the powder-spinning speed-regulating motor 10 connected to the powder-spinning shaft 5 performs forward and reverse rotation at sonic speed, generating high-frequency oscillation. The gap between the upper wear-resistant ring 6 and the lower baffle disc 7 is ground into powder, which then falls into the weighing container, achieving ultra-precision powder discharging.

[0029] The first driving mechanism includes a powder-spinning speed-regulating motor 10, a bearing limiting frame 11, and a slider 12. The powder-spinning speed-regulating motor 10 is fixedly mounted on the bearing limiting frame 11. The bearing limiting frame 11 is slidably connected to the mounting main board 1 through the slider 12. The bearing limiting frame 11 is connected to the output end of the second driving mechanism. The output end of the powder-spinning speed-regulating motor 10 is provided with a coupling 13.

[0030] The coupling 13 can prevent wear when the motor shaft of the powder-spinning speed-regulating motor 10 is eccentric with the powder-spinning rotating shaft 5.

[0031] In this embodiment, the coupling 13 is detachably connected to the powder-spinning shaft 5 via a hexagonal male-female connector.

[0032] In a specific implementation, a hexagonal male and female connector 14 can be provided on the coupling 13, and a hexagonal female connector 15 can be provided on the powder spinning shaft 5, thereby realizing the detachable connection and power transmission between the coupling 13 and the powder spinning shaft 5.

[0033] In this embodiment, the powder output speed and amount can be determined by the rotation speed of the motor of the powder spinning shaft 5 and the size of the powder outlet 8.

[0034] In this embodiment, a slide rail 16 is vertically arranged on one side of the top of the mounting motherboard 1, and the slider 12 is slidably disposed on the slide rail 16. The second drive mechanism can drive the first drive mechanism to move up and down as a whole, thereby driving the lower baffle disc 7 at the bottom of the powder-spinning shaft 5 to move up and down, adjusting the size of the powder outlet 8. When the second drive mechanism drives the lower baffle disc 7 to move upward, the gap between the upper wear-resistant ring 6 and the lower baffle disc 7 forms the powder outlet 8 valve, which becomes smaller; when the second drive mechanism drives the lower baffle disc 7 to move upward, the gap between the upper wear-resistant ring 6 and the lower baffle disc 7 forms the powder outlet 8 valve, which becomes larger.

[0035] Furthermore, in this embodiment, the second drive mechanism includes a valve opening speed-regulating motor 17, a bearing 18, and an eccentric shaft 19. The output end of the valve opening speed-regulating motor 17 is connected to the input end of the eccentric shaft 19, and the output end of the eccentric shaft 19 is provided with the bearing 18, which is disposed within the bearing limiting frame 11.

[0036] The eccentric shaft 19 is fitted with the bearing 18 and can rotate from 0 to 180 degrees in conjunction with the valve opening speed-regulating motor 17, corresponding to the powder outlet 8 from closed to its maximum opening. The dimensions of the bearing limiting frame 11 are matched with the diameter movement of the bearing 18, and the bearing limiting frame 11 can be prevented from wearing through the action of the bearing 18.

[0037] The valve opening speed-regulating motor 17 is equipped with an origin sensor 20 and an origin sensor baffle 21.

[0038] When the origin sensor 20 detects that the valve opening speed control motor 17 has reset, the powder outlet 8 is completely closed.

[0039] Furthermore, in this embodiment, the powder precision valve device also includes a powder weighing module (not shown in the figure) disposed below the lower baffle disc 7, and a control system connected to the powder weighing module, the powder-spinning speed-regulating motor 10, and the valve opening speed-regulating motor 17; the powder weighing module includes a weighing body and a weighing container disposed on the weighing body.

[0040] The weighing container is used to collect and weigh powder. The weighing body is linked in real time with the valve opening speed-regulating motor 17, and the PID servo adjusts the size of the powder outlet 8 and the speed of the powder-throwing speed-regulating motor 10.

[0041] The weighing body serves as a feedback source, adjusting the gap between the upper wear-resistant ring 6 and the lower stop disc 7 to realize a closed-loop control system for the electronic control software.

[0042] In this embodiment, a valve clamp 22 is provided on the mounting motherboard 1, the powder hopper 2 is provided on the valve clamp 22, and a vibration motor 23 is also provided at the bottom of the powder hopper 2 on the upper wear-resistant ring 6.

[0043] The valve clamp 22 is detachably mounted on the mounting main board 1 for easy replacement and subsequent maintenance. The vibration of the vibration motor 23 helps to ensure uniform powder feeding, allowing the powder in the powder hopper 2 to flow smoothly from the powder outlet 8 and preventing material jamming.

[0044] In this embodiment, a powder hopper sensor 24 is also provided on the mounting plate. When the powder sensor detects that there is material, the control system starts to operate and controls the valve opening speed regulating motor 17 and the powder throwing speed regulating motor 10 to start working.

[0045] Furthermore, in this embodiment, a stirring spring 25 is provided at the bottom of the powder-spinning shaft 5. In this embodiment, the stirring spring 25, in conjunction with the powder-spinning shaft 5, prevents the powder from becoming hollow and avoids a precipitous collapse and fall. The stirring spring 25 has a spiral surface sweeping structure, which increases the contact area with the powder. The stirring spring 25 has a small diameter, resulting in low resistance and preventing jamming or blockage.

[0046] Furthermore, in this embodiment, a thrust bearing 18 is provided at the top of the powder-spinning shaft 5, and a return spring for the powder-spinning shaft 5 is provided inside the thrust bearing 18.

[0047] In this embodiment, the thrust bearing 18 can prevent wear between the return spring and the powder hopper 2.

[0048] The working principle and process of the precision valve device for powder materials of this invention are as follows: 1. When the valve opens, the speed-regulating motor 17 returns to its origin, and the powder outlet 8 closes.

[0049] 2. Powder enters the powder hopper 2 from the powder feed hopper 3, and the powder hopper sensor 24 detects the presence of powder.

[0050] 3. Start the valve opening speed regulating motor 17, and the eccentric shaft 19 drives the second drive mechanism to slide up and down on the slide rail 16, thereby driving the powder-spinning shaft 5 to adjust the opening size of the powder outlet 8.

[0051] 4. The weighing container collects and weighs the powder, and controls it in two stages. It uses a high-speed rotating and spinning mechanism with a large weight to quickly reach the set weight, and then switches to a low-weight PID servo adjustment valve to adjust the opening size and the speed of the powder spinning motor 10 to rotate slowly, grinding the powder until it approaches the set weight, and the powder discharge is completed.

[0052] For example, assuming the target powder weight is 200 grams, the first stage sets 160 grams as the maximum weight. The gap between the upper wear-resistant ring 6 and the lower baffle disc 7 is set to 5 mm. The lower baffle disc 7 rotates at high speed, and the powder is thrown out of the lower baffle disc 7 and falls into the weighing container. When the weighing body detects that the weight is greater than or equal to 160 grams, it switches to the low-weight PID servo to adjust the opening size of the powder outlet 8 and rotates at low speed until the weight reaches 200 grams.

[0053] 5. The valve opening speed control motor 17 returns to its origin and the valve opening closes.

[0054] The beneficial effects of the precision valve device for powder materials of the present invention are: The present invention, through the above technical solution, includes: a mounting motherboard, a powder hopper, and a powder inlet hopper. The powder hopper is fixedly disposed on one side of the mounting motherboard, and the powder inlet hopper is connected to the powder hopper. A powder-spinning shaft is disposed inside the powder hopper. An upper wear-resistant ring is disposed at the bottom of the powder hopper. A lower baffle disc is fixedly disposed at the bottom of the powder-spinning shaft after passing through the upper wear-resistant ring. The gap between the upper wear-resistant ring and the lower baffle disc forms a powder outlet. A first drive mechanism for driving the powder-spinning shaft to rotate is disposed on one side of the top of the mounting motherboard. A second drive mechanism for driving the first drive mechanism to move up and down along the mounting motherboard, thereby driving the lower baffle disc at the bottom of the powder-spinning shaft to move up and down, and thus adjusting the size of the powder outlet, can improve the powder dispensing accuracy and powder dispensing efficiency, and avoid material jamming.

[0055] To achieve the above objectives, the present invention also proposes a control method for a precision valve device for powder materials, characterized in that the method is applied to the precision valve device for powder materials as described in the above embodiments, and the method includes the following steps: Step S10: Adjust the powder outlet formed by the gap between the upper wear-resistant ring and the lower baffle disc to close.

[0056] Step S20: Add a predetermined amount of powder from the powder inlet hopper.

[0057] Step S30: Start the first drive mechanism to drive the powder-spinning shaft to rotate and stir the powder in the powder hopper. At the same time, start the second drive mechanism to control the first drive mechanism to move in the direction of movement, thereby driving the powder-spinning shaft to move downward, adjusting the powder outlet to the first size, and throwing the powder from the powder outlet into the weighing container.

[0058] In step S40, when the weighing module detects that the amount of powder discharged from the weighing container has reached the first predetermined value, the second drive mechanism is used to adjust and reduce the powder outlet to the second stage size. At the same time, the first drive mechanism is used to adjust the rotation speed of the powder-spinning shaft to grind and discharge powder.

[0059] In step S50, after the powder is dispensed, the first drive mechanism is controlled to move upward by the second drive mechanism, which in turn drives the powder-spinning shaft to move upward until the powder outlet is closed.

[0060] This invention improves powder discharge accuracy and efficiency by adjusting the gap between the upper wear-resistant ring and the lower baffle disc, avoids material jamming, and achieves precise powder discharge through closed-loop control of the entire process using electronic control software.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural changes made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A precision valve device for powder materials, characterized in that, include: The system includes a motherboard, a powder hopper, and a powder feed hopper. The powder hopper is fixedly located on one side of the motherboard, and the powder feed hopper is connected to the powder hopper. A powder-spinning shaft is installed inside the powder hopper, and an upper wear-resistant ring is installed at the bottom of the powder hopper. A lower baffle disc is fixedly installed at the bottom of the powder-spinning shaft after passing through the upper wear-resistant ring. The gap between the upper wear-resistant ring and the lower baffle disc forms the powder outlet. The top side of the mounting motherboard is provided with a first drive mechanism for driving the powder-spinning shaft to rotate, and the other top side of the mounting motherboard is provided with a second drive mechanism for driving the first drive mechanism to move up and down along the mounting motherboard, thereby driving the lower baffle disc at the bottom of the powder-spinning shaft to move up and down, and thus adjusting the size of the powder outlet.

2. The precision valve device for powder materials according to claim 1, characterized in that, The first driving mechanism includes a powder-spinning speed-regulating motor, a bearing limiting frame, and a slider. The powder-spinning speed-regulating motor is fixedly mounted on the bearing limiting frame. The bearing limiting frame is slidably connected to the mounting main board via the slider. The bearing limiting frame is connected to the output end of the second driving mechanism. The output end of the powder-spinning speed-regulating motor is provided with a coupling. The coupling is detachably connected to the powder-spinning shaft via a hexagonal male-female connector.

3. The precision valve device for powder materials according to claim 2, characterized in that, The second drive mechanism includes a valve opening speed-regulating motor, a bearing, and an eccentric shaft. The output end of the valve opening speed-regulating motor is connected to the input end of the eccentric shaft, and the bearing is disposed at the output end of the eccentric shaft within the bearing limiting frame.

4. The precision valve device for powder materials according to claim 3, characterized in that, The valve opening speed-regulating motor is equipped with an origin sensor and an origin sensor baffle.

5. The precision valve device for powder materials according to claim 3, characterized in that, The powder precision valve device also includes a powder weighing module disposed below the lower baffle disc, and a control system connected to the powder weighing module, the powder-spinning speed-regulating motor, and the valve opening speed-regulating motor; the powder weighing module includes a weighing body and a weighing container disposed on the weighing body.

6. The precision valve device for powder materials according to claim 1, characterized in that, The mounting motherboard is equipped with a valve clamp, the powder hopper is mounted on the valve clamp, and a vibration motor is also mounted on the bottom of the powder hopper and the upper wear ring.

7. The precision valve device for powder materials according to claim 1, characterized in that, The mounting motherboard is equipped with a powder hopper sensor.

8. The precision valve device for powder materials according to claim 1, characterized in that, A stirring spring is installed at the bottom of the powder-spinning shaft.

9. The precision valve device for powder materials according to claim 1, characterized in that, A thrust bearing is provided at the top of the powder-spinning shaft, and a return spring for the powder-spinning shaft is provided inside the thrust bearing.

10. A method for controlling a precision valve device for powder materials, characterized in that, The method is applied to the powder precision valve device as described in any one of claims 1 to 9, and the method includes the following steps: Step S10: Adjust the powder outlet formed by the gap between the upper wear-resistant ring and the lower baffle disc to close. Step S20: Add a predetermined amount of powder from the powder inlet hopper; Step S30: Start the first drive mechanism to drive the powder-spinning shaft to rotate and stir the powder in the powder hopper. At the same time, start the second drive mechanism to control the first drive mechanism to move in the direction of movement, thereby driving the powder-spinning shaft to move downward, adjusting the powder outlet to the first level size, and throwing the powder from the powder outlet into the weighing container. Step S40: When the weighing module detects that the amount of powder discharged from the weighing container has reached the first predetermined value, the second drive mechanism is used to adjust and reduce the powder outlet to the second stage size. At the same time, the first drive mechanism is used to adjust the rotation speed of the powder-spinning shaft to grind and discharge powder. In step S50, after the powder is dispensed, the first drive mechanism is controlled to move upward by the second drive mechanism, which in turn drives the powder-spinning shaft to move upward until the powder outlet is closed.

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