Screening device and method for guaranteeing purity of metal and alloy powder

Abstract

The invention relates to the technical field of alloy powder screening, and discloses a screening device and method for guaranteeing the purity of metal and alloy powder, the screening device comprises a box body, a barrel body is fixedly connected to the top of the box body, and an adjusting assembly is arranged in the barrel body; the adjusting assembly comprises an adjusting column, the adjusting column is in threaded connection with the interior of the barrel body, the top of the barrel body is fixedly connected with a gear ring, the outer wall of the barrel body is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a gear column, the gear column is meshed with the outer wall of the gear ring, and the top of the adjusting column is fixedly connected with a feeding hopper. According to the device, the output end of the first motor drives the tooth column to rotate, the tooth column drives the adjusting column to rotate through the tooth ring, the adjusting column extends out of the barrel body to adjust the thickness of coarse powder, the adjusting column retracts into the barrel body to adjust the thickness of fine powder, the effect of adjusting the grinding thickness is achieved, and the problems that powder in front of a screening device is inconsistent in thickness and needs to be ground again are solved; and the convenience of the screening device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of alloy powder screening, and in particular to a screening device and method for ensuring the purity of metal and alloy powders. Background Art

[0002] A screening device is a device used to separate and screen different particle size components in materials. It is widely used in mining, chemical industry, food processing, construction, metallurgy and other fields. Different applications have different requirements for powder particle size. For example, 3D printing requires powder particle size to be uniform and stable. Too large particles may cause printing failure, and too small particles may affect the stability of printing. Therefore, a screening device is needed to ensure the purity of metal and alloy powders.

[0003] Screening devices that ensure the purity of metal and alloy powders can be divided into many types, namely, vibrating screening devices, rotary screening devices and air screening devices. According to different screening needs and application scenarios, screening devices that ensure the purity of metal and alloy powders can be divided into different types such as vibrating screens, rotary screens, air screens, ultrasonic screens, electrostatic screens, oscillating screens, pressure screens and multi-stage screens. Among them, the vibrating screening device uses vibration to make the metal powder pass through the screen, thereby achieving the effect of grading and removing impurities.

[0004] However, it is usually difficult to adjust the coarseness of powders in existing screening devices, and the powders often have uneven coarseness during the screening process, which not only affects the screening effect, but also requires secondary grinding of the powders, increasing the complexity and cost of production. Therefore, how to ensure the consistency of powder coarseness and reduce the need for re-grinding has become an important issue for existing screening devices. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a screening device and method for ensuring the purity of metal and alloy powders, which solves the problem that the powders before the screening device are inconsistent in coarseness and fineness and need to be re-grinded.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A screening device for ensuring the purity of metal and alloy powders, comprising a box body, a barrel body is fixedly connected to the top of the box body, and an adjustment component is arranged inside the barrel body; The adjusting component includes an adjusting column, which is threadedly connected to the inside of the barrel body, a gear ring is fixedly connected to the top of the barrel body, a motor 1 is fixedly connected to the outer wall of the barrel body, a gear column is fixedly connected to the output end of the motor 1, the gear column is meshed with the outer wall of the gear ring, a charging hopper is fixedly connected to the top of the adjusting column, a grinding component is arranged inside the adjusting column, the grinding component includes a grinding column, a ball sleeve is rotatably connected to the top of the grinding column, the outer wall of the ball sleeve is fixedly connected to the inside of the adjusting column, a driving component is arranged at the bottom of the grinding column, and the driving component includes a motor 2, the outer wall of the motor 2 is fixedly connected to the outer wall of the barrel body, and the output end of the motor 2 is fixedly connected to a bevel gear 1 The bottom of the grinding column is fixedly connected with a bevel gear 2, and the bevel gear 2 is meshed with the outer wall of the bevel gear 1. A limiting groove is provided inside the box body, and a fixing plate is fixedly connected with the outer wall of the box body. One side of the fixing plate is fixedly connected with a motor 3, and the output end of the motor 3 is fixedly connected with a driving gear. The fixed plate is rotatably connected with a driven gear, and the driven gear is fixedly connected with a sector gear. The fixed plate is slidably connected with a rack, and the rack is meshed with the sector gear, and the driven gear is meshed with the driving gear. One side of the rack is fixedly connected with a screen, and a baffle is fixedly connected to the top of the screen, and one side of the screen is slidably connected to the inside of the limiting groove.

[0007] Preferably, a support plate is fixedly connected inside the box body, a fixed column is fixedly connected to the top of the support plate, a limit plate is slidably connected inside the fixed column, and bristles are fixedly connected to the top of the limit plate.

[0008] Preferably, a telescopic rod is provided inside the fixed column, a spring is sleeved on the outer wall of the telescopic rod, one end of the telescopic rod and the spring are fixedly connected to the bottom of the limiting plate, and the other end of the telescopic rod and the spring are fixedly connected inside the fixed column.

[0009] Preferably, a discharge pipe is fixedly connected to the bottom of the box body, a shell is fixedly connected to the bottom of the discharge pipe, a drive motor is fixedly connected to the top of the shell, a rotating shaft is fixedly connected to the output end of the drive motor, an auger blade is fixedly connected to the outer wall of the rotating shaft, and a discharge port is opened inside the shell.

[0010] A screening method for ensuring the purity of metal and alloy powders comprises the following steps: S1, the adjusting column rotates, so that the adjusting column extends out of the barrel body to adjust the coarse powder thickness, and the adjusting column retracts into the barrel body to adjust the fine powder thickness. When grinding, the alloy powder is put into the feeding hopper, and then the output end of the motor drives the bevel gear 1 to rotate, and the bevel gear 1 drives the grinding column to rotate through the bevel gear 2, and then the grinding column and the adjusting column are ground, so as to achieve the effect of adjusting the grinding coarseness; S2, the ground powder falls into the screen, and then the three output ends of the motor drive the driving gear to rotate, and the driving gear drives the fan gear to rotate through the driven gear, and then the upper and lower fan gears drive the rack to move back and forth in the left and right directions, and then the rack drives the screen to move back and forth in the left and right directions to screen the powder, achieving the effect of rapid screening; S3. The bristles are limited in the fixed column by the limit plate and supported by the tension of the spring, so that the bristles can always fit the bottom of the screen. Then the screened powder falls into the shell through the discharge pipe, and then the output end of the driving motor drives the shaft to rotate, and the shaft drives the auger blades to rotate to drive the screened powder to be discharged, so that the powder is discharged through the discharge port, achieving the effect of self-cleaning the screen during screening.

[0011] Working principle: When using the screening device to ensure the purity of metal and alloy powders, when the grinding degree needs to be adjusted, the output end of the motor drives the tooth column to rotate, and the tooth column drives the adjusting column to rotate through the tooth ring, and then the adjusting column extends out of the barrel to adjust the coarse powder coarseness, and the adjusting column retracts into the barrel to adjust the fine powder coarseness. When grinding, the alloy powder is put into the feeding hopper, and then the output end of the motor drives the bevel gear 1 to rotate, and the bevel gear 1 drives the grinding column to rotate through the bevel gear 2, and then the grinding column and the adjusting column are ground to achieve the effect of adjusting the grinding coarseness; During screening, the ground powder falls into the screen, and then the three output ends of the motor drive the active gear to rotate, and the active gear drives the fan gear to rotate through the driven gear, and then the upper and lower fan gears drive the rack to move back and forth in the left and right directions, and then the rack drives the screen to move back and forth in the left and right directions to screen the powder, achieving the effect of rapid screening; When the screen moves back and forth left and right, the screen is self-cleaned by the bristles, and the bristles are limited in the fixed column by the limit plate and supported by the tension of the spring so that the bristles can always fit the bottom of the screen. Then the screened powder falls into the shell through the discharge pipe, and then the output end of the driving motor drives the shaft to rotate, and the shaft drives the auger blades to rotate to drive the screened powder to be discharged, and the powder is discharged through the discharge port, thereby achieving the effect of self-cleaning the screen during screening.

[0012] The present invention provides a screening device and method for ensuring the purity of metal and alloy powders. It has the following beneficial effects: 1. The present invention drives the tooth column to rotate through an output end of a motor, and the tooth column drives the adjusting column to rotate through a gear ring, so that the adjusting column extends out of the barrel body to adjust the coarse powder coarseness, and the adjusting column retracts into the barrel body to adjust the fine powder coarseness, thereby achieving the effect of adjusting the grinding coarseness, solving the problem of inconsistent powder coarseness in front of the screening device and the need for re-grinding, and improving the convenience of the screening device.

[0013] 2. The present invention drives the driving gear to rotate through the three output ends of the motor, and the driving gear drives the fan gear to rotate through the driven gear, and then the upper and lower fan gears drive the rack to move back and forth in the left and right directions, thereby achieving a rapid screening effect, solving the problem of high screening noise caused by vibration and other structural screening during screening in traditional screening devices, and improving the practicality of the screening device.

[0014] 3. The present invention uses bristles to self-clean the screen when it moves back and forth left and right. The bristles are limited in the fixed column by the limiting plate and supported by the tension of the spring so that the bristles can always fit the bottom of the screen, thereby achieving the effect of self-cleaning the screen during screening, solving the problem that the screen is easily blocked after use and the operator needs to clean it frequently, thereby reducing the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the internal structure of the barrel of the present invention; Figure 3 It is a schematic diagram of the grinding column structure of the present invention; Figure 4 It is a rear schematic diagram of the present invention; Figure 5 It is a schematic diagram of the internal structure of the box of the present invention; Figure 6 It is a schematic diagram of the fan-shaped gear ring structure of the present invention; Figure 7 It is a schematic diagram of the internal structure of the fixing column of the present invention; Figure 8 It is a schematic diagram of the internal structure of the shell of the present invention.

[0016] Legend: 1. Box body; 2. Barrel body; 3. Adjusting column; 4. Gear ring; 5. Feeding hopper; 6. Motor 1; 7. Gear column; 8. Motor 2; 9. Bevel gear 1; 10. Bevel gear 2; 11. Grinding column; 12. Ball sleeve; 13. Fixed plate; 14. Motor 3; 15. Limiting groove; 16. Screen; 17. Rack; 18. Driving gear; 19. Driven gear; 20. Fan gear; 21. Support plate; 22. Fixed column; 23. Limiting plate; 24. Bristles; 25. Telescopic rod; 26. Spring; 27. Shell; 28. Discharge port; 29. ​​Driving motor; 30. Rotating shaft; 31. Auger blade; 32. Discharge pipe; 33. Baffle. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Please refer to the attached Figure 1 -Attached Figure 3 , the present invention provides: a screening device for ensuring the purity of metal and alloy powders, comprising a box body 1, a barrel body 2 is fixedly connected to the top of the box body 1, and an adjusting component is arranged inside the barrel body 2; The adjustment component includes an adjustment column 3, which is threadedly connected to the inside of the barrel 2. The up and down movement of the adjustment column 3 can adjust the coarseness of the powder according to different powder requirements to ensure the consistency of the powder. A gear ring 4 is fixedly connected to the top of the barrel 2. The gear ring 4 is combined with the adjustment column 3. The position of the adjustment column 3 can be adjusted by rotating the gear column 7, thereby achieving precise adjustment of the coarseness of the powder. A motor 6 is fixedly connected to the outer wall of the barrel 2, and a gear column 7 is fixedly connected to the output end of the motor 6. The gear column 7 is meshed with the outer wall of the gear ring 4. The smooth adjustment of the adjustment column 3 is achieved through the drive of the motor 6, which is convenient for adjustment according to the requirements of different powders. A feeding hopper 5 is fixedly connected to the top of the adjusting column 3. The feeding hopper 5 is used to uniformly transport the powder to the inside of the adjusting column 3 to ensure that the feeding process is uninterrupted and uniform, thereby ensuring the screening efficiency. A grinding assembly is arranged inside the adjusting column 3. The grinding assembly includes a grinding column 11. The grinding column 11 is connected to the adjusting column 3 through a ball sleeve 12. The function of the ball sleeve 12 is to allow the grinding column 11 to rotate freely in the adjusting column 3, reduce wear, and increase the service life. The outer wall of the ball sleeve 12 is fixedly connected to the inside of the adjusting column 3 to ensure the stability of the grinding assembly and avoid loosening or deviation during the grinding process. A driving assembly is arranged at the bottom of the grinding column 11. The driving assembly includes a motor 2 8. The outer wall of the motor 2 8 is fixedly connected to the outer wall of the barrel 2. The output end of the motor 2 8 drives the grinding column 11 to rotate through a gear transmission system. The motor 28 provides sufficient power to enable the grinding column 11 to perform grinding work continuously and stably, ensuring the purity of metal and alloy powders. The output end of the motor 28 is fixedly connected to a bevel gear 19, and the bottom of the grinding column 11 is fixedly connected to a bevel gear 210. The bevel gear 210 is meshed with the outer wall of the bevel gear 19. Through the transmission system of the bevel gears, the motor 28 can efficiently transmit the rotational power to the grinding column 11, ensuring the smooth progress of the grinding action. Specifically, when adjusting the grinding degree, first, the output end of the motor 1 6 drives the tooth column 7 to rotate, and the tooth column 7 drives the adjustment column 3 to rotate in the barrel 2 through the gear ring 4 meshing with it, so as to adjust the coarseness of the powder. By rotating the adjustment column 3, it can be extended in the barrel 2, thereby increasing the grinding gap and adjusting it to coarse powder; and when the adjustment column 3 is retracted into the barrel 2, the grinding gap is reduced, so that the particles of the alloy powder are finer. This adjustment method is simple and accurate, effectively controls the grinding coarseness of the powder, and meets different grinding requirements. During the grinding process, the alloy powder is first put into the feeding hopper 5 to ensure that the powder enters the grinding area evenly. Then, the output end of the motor 2 8 drives the bevel gear 1 9 to rotate, and the bevel gear 1 9 drives the grinding column 11 to rotate at high speed through its mutual meshing with the bevel gear 2 10. A grinding contact area is formed between the grinding column 11 and the adjustment column 3, and the alloy powder is continuously ground to ensure that the refinement process of the powder particles is successfully completed.

[0019] Please see attached Figure 4 -Attached Figure 6, a limiting groove 15 is provided inside the box 1, and the function of the limiting groove 15 is to limit the sliding range of the rack 17, so as to ensure that the rack 17 can move smoothly along the predetermined track during the screening process to avoid deviation. The outer wall of the box 1 is fixedly connected with a fixing plate 13, and the fixing plate 13 provides a stable support for other components to ensure the stability and accuracy of each component. A motor 3 14 is fixedly connected to one side of the fixing plate 13, and a driving gear 18 is fixedly connected to the output end of the motor 3 14. The motor 3 14 provides power through the driving gear 18, so that the gear system can operate normally, thereby driving the screen 16 of the screening device for efficient screening. The fixed plate 13 is internally rotatably connected with a driven gear 19, and the driven gear 19 is meshed with the driving gear 18 to ensure that the power is smoothly transmitted from the motor 3 14 to the driven gear 19. The meshing and rotation of the gears realize the continuous movement of the screen 16. The fan gear 20 is fixedly connected inside the driven gear 19, and the fan gear 20 and the rack 17 drive the left and right reciprocating motion of the rack 17 through meshing. The function of the sector gear 20 is to convert the rotational power of the driven gear 19 into the linear reciprocating motion of the rack 17, so as to ensure that the screening effect of the screen 16 is more uniform and efficient. The fixed plate 13 is internally slidably connected with the rack 17, and the rack 17 slides left and right in the limit groove 15 driven by the sector gear 20, so as to ensure that the screen 16 can perform screening work uniformly and stably. The rack 17 is meshed with the sector gear 20, and while transmitting power, it also ensures the precise movement of the rack 17. The screen 16 is fixedly connected to one side of the rack 17, and the screen 16 reciprocates left and right under the drive of the rack 17, so as to achieve the screening of the material. The movement of the screen 16 can effectively separate powders of different particle sizes, and ensure the high efficiency of the screening effect. The baffle 33 is fixedly connected to the top of the screen 16, and the function of the baffle 33 is to prevent the powder from escaping during the screening process, and ensure that the screened material can be screened uniformly through the screen 16, so as to avoid the waste of materials. One side of the screen 16 is slidably connected to the inside of the limiting groove 15, and the limiting groove 15 plays a role in guiding the movement of the screen 16, so that the screen 16 can slide within a certain range, thereby ensuring the accuracy and stability of the screening process; Specifically, during the screening process, first, the ground alloy powder falls from the grinding area into the screen 16 and begins to enter the screening process. Subsequently, the output end of the motor 3 14 drives the driving gear 18 to rotate through the transmission device, and the driving gear 18 transmits power through the meshing with the driven gear 19, thereby driving the fan gear 20 to rotate. The synchronous rotation of the upper and lower fan gears 20 drives the rack 17 to reciprocate in the left and right directions through a precise mechanical structure. The rack 17 is connected to the screen 16, so that the screen 16 reciprocates left and right. Through this reciprocating motion, the screen 16 efficiently screens the powder that falls on it, ensuring that larger particles are screened out and fine particles pass through the screen 16 smoothly to enter the next process. This screening process greatly improves the screening efficiency, can quickly separate powders of different particle sizes, and achieve accurate particle classification.

[0020] Please see attached Figure 7 and attached Figure 8, a support plate 21 is fixedly connected inside the box 1, and the support plate 21 provides stable support for the entire structure, ensuring the reliability and working accuracy of each component. A fixed column 22 is fixedly connected to the top of the support plate 21, and the function of the fixed column 22 is to provide vertical support for the subsequent sliding connection and ensure that the limit plate 23 and other components can operate stably. A limit plate 23 is slidably connected inside the fixed column 22, and the sliding of the limit plate 23 inside the fixed column 22 can enable the bristles 24 to perform effective self-cleaning work to avoid the sieve 16 from being blocked during operation. The top of the limit plate 23 is fixedly connected to the bristles 24, and the contact between the bristles 24 and the sieve 16 can clean the sieve 16 during the screening process, prevent the accumulation of powder and impurities, and ensure the continuity of the screening effect and the cleanliness of the sieve 16. Through the limiting effect of the limit plate 23, the bristles 24 can always maintain close contact with the bottom of the sieve 16, thereby achieving efficient cleaning. A telescopic rod 25 is arranged inside the fixed column 22. The function of the telescopic rod 25 is to enable the limit plate 23 to adjust its position according to the actual situation when necessary, so as to further enhance the flexibility and adaptability of the screening device. A spring 26 is arranged on the outer wall of the telescopic rod 25. The function of the spring 26 is to provide a certain elastic support for the telescopic rod 25, so as to ensure that the limit plate 23 can slide freely within a certain range, and also ensure the stability of the bristles 24 during the cleaning process. One end of the telescopic rod 25 and the spring 26 are fixedly connected to the bottom of the limit plate 23, and the other end is fixedly connected to the inside of the fixed column 22, so as to ensure the stability of the telescopic rod 25 and the spring 26, and enable the bristles 24 to maintain the self-cleaning effect during the screening process. A discharge pipe 32 is fixedly connected to the bottom of the box body 1. The discharge pipe 32 is used to collect and discharge the screened materials, so as to ensure that the materials can be smoothly transported to the next processing link. A housing 27 is fixedly connected to the bottom of the discharge pipe 32, and the housing 27 is used to connect the discharge pipe 32 to the drive device and provide stable support. A driving motor 29 is fixedly connected to the top of the housing 27. The driving motor 29 provides power to the auger blade 31 through the rotating shaft 30. The outer wall of the rotating shaft 30 is fixedly connected to the auger blade 31. The auger blade 31 drives the material to move toward the discharge port 28 by rotation. The housing 27 is provided with a discharge port 28. The discharge port 28 is used to discharge the screened material smoothly to avoid material accumulation and blockage. The setting of the discharge port 28 ensures the high efficiency of the screening device, so that the screened powder can be discharged in a timely and efficient manner, ensuring the continuity and production efficiency of the screening process; Specifically, when the screen 16 reciprocates left and right, in order to maintain high efficiency and continuity in the screening process, the screen 16 is equipped with a self-cleaning mechanism. The bristles 24 are limited in the fixed column 22 by the limit plate 23, and supported by the tension of the spring 26 to ensure that the bristles 24 are always close to the bottom of the screen 16. The design of the bristles 24 allows it to effectively clean the surface of the screen 16 when the screen 16 moves up and down, and promptly remove the powder residue attached to the screen 16 to prevent blockage or powder accumulation, thereby ensuring the permeability and screening efficiency of the screen 16. As the screening process continues, the powder on the screen 16 is gradually removed by the bristles 24 and falls smoothly into the housing 27 below through the discharge pipe 32. In order to better complete the subsequent powder transportation, the output end of the drive motor 29 drives the shaft 30 to rotate, and the shaft 30 further drives the auger blade 31 to rotate. The rotation of the auger blade 31 enables the sieved powder to be effectively transported to the unloading area and discharged smoothly through the discharge port 28, ensuring that the powder can be discharged in a timely and uniform manner and avoiding backlog.

[0021] Please see attached Figure 1 -Attached Figure 8 The embodiment of the present invention provides a screening method for ensuring the purity of metal and alloy powders, comprising the following steps: S1, the adjusting column 3 rotates, so that the adjusting column 3 extends out of the barrel body 2 to adjust the coarse powder coarseness, and the adjusting column 3 retracts into the barrel body 2 to adjust the fine powder coarseness. When grinding, the alloy powder is put into the feeding hopper 5, and then the output end of the motor 2 8 drives the bevel gear 1 9 to rotate, and the bevel gear 1 9 drives the grinding column 11 to rotate through the bevel gear 2 10, and then the grinding column 11 and the adjusting column are ground, so as to achieve the effect of adjusting the grinding coarseness; S2, the ground powder falls into the screen 16, and then the output end of the motor 3 14 drives the driving gear 18 to rotate, and the driving gear 18 drives the fan gear 20 to rotate through the driven gear 19, and then the upper and lower fan gears 20 drive the rack 17 to move back and forth in the left and right directions, and then the rack 17 drives the screen 16 to move back and forth in the left and right directions to screen the powder, achieving the effect of rapid screening; S3, the bristles 24 are limited in the fixed column 22 by the limiting plate 23, and supported by the tension of the spring 26, so that the bristles 24 can always fit the bottom of the screen 16, and then the screened powder falls into the shell 27 through the discharge pipe 32, and then the output end of the driving motor 29 drives the rotating shaft 30 to rotate, and the rotating shaft 30 drives the auger blade 31 to rotate and drive the screened powder to be discharged, so that the powder is discharged through the discharge port 28, thereby achieving the effect of self-cleaning the screen 16 during screening.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screening device for ensuring the purity of metal and alloy powders, comprising a housing (1), characterized in that: The top of the box body (1) is fixedly connected to a barrel body (2), and an adjustment component is arranged inside the barrel body (2); The adjusting assembly comprises an adjusting column (3), wherein the adjusting column (3) is threadedly connected to the inside of the barrel body (2); a gear ring (4) is fixedly connected to the top of the barrel body (2); a motor 1 (6) is fixedly connected to the outer wall of the barrel body (2); a gear column (7) is fixedly connected to the output end of the motor 1 (6); the gear column (7) meshes with the outer wall of the gear ring (4); a hopper (5) is fixedly connected to the top of the adjusting column (3); a grinding assembly is arranged inside the adjusting column (3); the grinding assembly comprises a grinding column (11); a ball sleeve (12) is rotatably connected to the top of the grinding column (11); the outer wall of the ball sleeve (12) is fixedly connected to the inside of the adjusting column (3); a driving assembly is arranged at the bottom of the grinding column (11); the driving assembly comprises a motor 2 (8); the outer wall of the motor 2 (8) is fixedly connected to the outer wall of the barrel body (2); the output end of the motor 2 (8) is fixedly connected to a bevel gear 1 (9); the bottom of the grinding column (11) is fixedly connected to The housing (1) is provided with a second bevel gear (10), the second bevel gear (10) meshing with the outer wall of the first bevel gear (9), a limiting groove (15) is provided inside the housing (1), a fixing plate (13) is fixedly connected to the outer wall of the housing (1), a motor (14) is fixedly connected to one side of the fixing plate (13), a driving gear (18) is fixedly connected to the output end of the motor (14), a driven gear (19) is rotatably connected to the inside of the fixing plate (13), and the driven gear (19) is rotatably connected to the output end of the motor (14). A sector gear (20) is fixedly connected inside the moving gear (19), a rack (17) is slidably connected inside the fixed plate (13), the rack (17) is meshed with the sector gear (20), the driven gear (19) is meshed with the driving gear (18), a screen (16) is fixedly connected to one side of the rack (17), a baffle (33) is fixedly connected to the top of the screen (16), and one side of the screen (16) is slidably connected to the inside of the limiting groove (15).

2. A screening device for ensuring the purity of metal and alloy powders according to claim 1, characterized in that: A support plate (21) is fixedly connected inside the box body (1), a fixing column (22) is fixedly connected to the top of the support plate (21), a limit plate (23) is slidably connected inside the fixed column (22), and bristles (24) are fixedly connected to the top of the limit plate (23).

3. A screening device for ensuring the purity of metal and alloy powders according to claim 2, characterized in that: A telescopic rod (25) is arranged inside the fixed column (22), and a spring (26) is sleeved on the outer wall of the telescopic rod (25). One end of the telescopic rod (25) and the spring (26) are fixedly connected to the bottom of the limit plate (23), and the other end of the telescopic rod (25) and the spring (26) are fixedly connected to the inside of the fixed column (22).

4. A screening device for ensuring the purity of metal and alloy powders according to claim 1, characterized in that: The bottom of the box body (1) is fixedly connected to a discharge pipe (32), the bottom of the discharge pipe (32) is fixedly connected to a housing (27), the top of the housing (27) is fixedly connected to a drive motor (29), the output end of the drive motor (29) is fixedly connected to a rotating shaft (30), the outer wall of the rotating shaft (30) is fixedly connected to an auger blade (31), and a discharge port (28) is provided inside the housing (27).

5. A screening method for ensuring the purity of metal and alloy powders, characterized in that , a screening device for ensuring the purity of metal and alloy powders as described in any one of claims 1 to 4, comprising the following steps: S1, the adjusting column (3) rotates, so that the adjusting column (3) extends out of the barrel (2) to adjust the coarse powder thickness, and the adjusting column (3) retracts into the barrel (2) to adjust the fine powder thickness. When grinding, the alloy powder is put into the feeding hopper (5), and then the output end of the second motor (8) drives the bevel gear one (9) to rotate, and the bevel gear one (9) drives the grinding column (11) to rotate through the bevel gear two (10), and then grinding is performed between the grinding column (11) and the adjusting column, thereby achieving the effect of adjusting the grinding thickness; S2, the ground powder falls into the screen (16), and then the output end of the motor 3 (14) drives the driving gear (18) to rotate, and the driving gear (18) drives the fan gear (20) to rotate through the driven gear (19), and then the upper and lower fan gears (20) drive the rack (17) to move back and forth in the left and right directions, and then the rack (17) drives the screen (16) to move back and forth in the left and right directions to screen the powder, thereby achieving a rapid screening effect; S3, the bristles (24) are limited in position in the fixed column (22) by the limiting plate (23) and supported by the tension of the spring (26), so that the bristles (24) can always fit the bottom of the screen (16), and then the sieved powder falls into the housing (27) through the discharge pipe (32), and then the output end of the driving motor (29) drives the rotating shaft (30) to rotate, and the rotating shaft (30) drives the auger blade (31) to rotate and drive the sieved powder to be discharged, so that the powder is discharged through the discharge port (28), thereby achieving the effect of self-cleaning the screen (16) during screening.

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