Classified screening equipment for metal powder processing

Abstract

The invention discloses graded screening equipment for metal powder processing, and relates to the technical field of screening equipment, the graded screening equipment comprises a screening box, and the screening box is sequentially provided with a graded screening mechanism, an intermittent feeding mechanism, a material processing mechanism and a material collecting mechanism; the grading screening mechanism comprises three vibrating screening assemblies arranged in the screening box and distributed at equal intervals and a variable speed driving assembly arranged outside the screening box, and the material processing mechanism comprises a dust processing assembly, a metal powder drying assembly and a control assembly. The grading screening mechanism is arranged, the sizes of screen holes of three screens are sequentially decreased from top to bottom, metal powder entering the screening box can be subjected to grading screening treatment conveniently, and therefore the metal powder obtained after grinding can be separated in order according to the particle size, metal powder of various different particle sizes can be screened out conveniently, and the screening effect is improved; and through the vibration screening effect, the situation that the screen is blocked can be effectively reduced, and the screening efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, and in particular to a grading and screening equipment for metal powder processing. Background Art

[0002] Metal powder is generally obtained by grinding in a ball mill. However, the metal powder obtained after grinding cannot be used directly, but needs to be screened. However, the existing metal powder screening equipment has the following problems in actual use: First, the existing screening equipment is often not convenient for classifying metal powders of different particle sizes, and thus is not convenient for screening out metal powders of various particle sizes, and the screen inside the screening equipment is prone to clogging, which affects the screening efficiency; Secondly, the existing screening equipment is not easy to control the conveying speed and amount of metal powder during the feeding process, resulting in the metal powder conveying speed being too fast and the conveying amount being too large, causing the metal powder to accumulate excessively on the screen and affecting the screening efficiency. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a grading and screening device for metal powder processing, which adopts the following technical solution: A grading and screening device for metal powder processing, comprising a screening box, on which a grading and screening mechanism, an intermittent feeding mechanism, a material processing mechanism and a collecting mechanism are sequentially arranged; The grading and screening mechanism includes three vibrating screening components arranged in the screening box and distributed at equal distances, and a variable speed drive component arranged outside the screening box, and the material handling mechanism includes a dust handling component, a metal powder drying component and a control component; The vibrating screening assembly comprises an inclined frame connected to the inner wall of the screening box through four spring expansion members at the four corners of the bottom, a screen fixedly connected to and adapted to the inclined frame, a rotating shaft rotatably mounted in the screening box, and two cams fixedly sleeved on the rotating shaft and located below the inclined frame, and the sizes of the screen holes of the three screens decrease from top to bottom; The variable speed drive assembly includes an L-shaped plate body fixedly connected to the rear outer wall of the screening box, a variable frequency motor fixedly mounted on the rear outer wall of the L-shaped plate body, a double groove pulley fixedly mounted on one of the rotating shafts located in the middle, two single groove pulleys fixedly mounted on the other two rotating shafts, and a frequency converter fixedly mounted on the side wall of the L-shaped plate body; The intermittent feeding mechanism includes a conveying cylinder, a shaft body rotatably installed in the conveying cylinder, a spiral conveying blade welded on the outer wall of the shaft body and located in the conveying cylinder, a motor bracket welded to the side wall of the conveying cylinder, a driving motor fixedly installed on the top outer wall of the motor bracket, a transmission gear fixedly mounted on one end of the shaft body and a toothless gear fixedly mounted on the output shaft of the driving motor and meshing with the transmission gear, and a support plate is welded on the top outer wall of the conveying cylinder.

[0004] As a preferred technical solution of the present invention, the three rotating shafts are of different lengths, and the output shaft of the variable frequency motor passes through the L-shaped plate and is coaxially fixedly connected to one end of a rotating shaft located in the middle through a coupling.

[0005] As a preferred technical solution of the present invention, the double-groove pulley is sequentially connected to the two single-groove pulleys through two transmission belts, and the frequency converter is electrically connected to the variable frequency motor.

[0006] As a preferred technical solution of the present invention, a bearing seat is welded to the top outer wall of the screening box, a conveying cylinder is welded to the top outer wall of the bearing seat, one end of the top of the conveying cylinder is fixedly connected to a feed bin, and the bottom end of the conveying cylinder and the top of the screening box are fixedly connected to the same feeding hopper.

[0007] As a preferred technical solution of the present invention, the dust handling component includes a dust box fixedly connected to the top outer wall of the support plate, an air hole opened on one side of the dust box, an air suction fan blade arranged in the air hole, a dust hood fixedly connected to the other side of the dust box and a filter element inserted in the dust box, and one side of the dust hood is connected to a dust head through a dust suction pipe.

[0008] As a preferred technical solution of the present invention, the metal powder drying assembly includes an air supply box fixedly connected to the top outer wall of the support plate, a through hole opened on one side of the air supply box, a supply fan blade arranged in the through hole, an electric heating wire group fixedly installed in the air supply box, and an air collecting hood fixedly connected to the other side of the air supply box, and one side of the air collecting hood is connected to the conveying cylinder through an air supply pipe.

[0009] As a preferred technical solution of the present invention, the control assembly includes two support frames fixedly connected to the inner walls of the adjacent sides of the dust collection box and the air supply box in sequence, a transmission shaft rotatably installed between the two support frames, a motor positioning plate welded between the dust collection box and the air supply box, a control motor fixedly installed on the top outer wall of the motor positioning plate, a driving bevel gear fixedly mounted on the output shaft of the control motor, and a driven bevel gear fixedly mounted on the transmission shaft and meshing with the driving bevel gear, and the suction fan blades and the air supply fan blades are fixedly mounted on the transmission shaft.

[0010] As a preferred technical solution of the present invention, the material collection mechanism includes three discharge ports opened on one side of the screening box and corresponding to the three screens, a material collection cover fixedly connected to the outer wall of one side of the screening box, and four material collection drawers, wherein three material collection drawers are installed in the material collection cover and are adapted to the positions of the three discharge ports, and another material collection drawer is installed in the screening box and is located below the grading screening mechanism.

[0011] As a preferred technical solution of the present invention, iron blocks are welded on the four aggregate drawers, three permanent magnets are fixedly embedded on one side of the aggregate cover, a permanent magnet is also fixedly embedded in the front lower part of the screening box, and the four iron blocks are fixedly attracted to the corresponding four permanent magnets respectively.

[0012] As a preferred technical solution of the present invention, an inspection opening is provided at the front of the screening box, and an inspection door matching the inspection opening is hinged at the front of the screening box.

[0013] The beneficial effects of the present invention are: 1. The present invention is provided with a grading screening mechanism, and the sizes of the sieve holes of the three sieves decrease from top to bottom, so that the metal powder entering the screening box can be graded and screened, so that the metal powder after the grinding process can be separated in order according to the particle size, so that a variety of metal powders of different particle sizes can be screened out, and the screening effect is improved. Moreover, through the effect of vibration screening, the blockage of the screen can be effectively reduced, which is conducive to improving the screening efficiency; 2. The present invention is provided with a variable speed drive assembly, which can realize the vibration screening effect of three screens by only one motor, which is beneficial to improve the utilization rate of the motor, reduce the deployment and installation cost of the motor, and facilitate subsequent maintenance. The speed of the variable frequency motor can be adjusted by the frequency converter, and then the speed of the cams installed on the three rotating shafts can be adjusted, so that the vibration frequency of the three screens can be flexibly adjusted to better meet the screening requirements of different metal powders, which is beneficial to further improve the screening effect; 3. The present invention is provided with an intermittent feeding mechanism, which can control the conveying speed and conveying amount of metal powder through intermittent feeding, avoid excessive accumulation of metal powder on the screen and affect the screening efficiency, and can also reduce the screening difficulty of the screening equipment, reduce the degree of damage to the screening equipment, and help to extend the service life of the screening equipment; 4. The present invention is provided with a material handling mechanism, and the dust handling component and the metal powder drying component are controlled by the control component to work together. Therefore, the dust handling component can effectively reduce the dust overflow caused by the metal powder in the feeding process, which is beneficial to reduce the dust pollution. The metal powder drying component can perform hot air drying on the metal powder in the conveying cylinder, thereby effectively improving the conveying efficiency of the metal powder, and also facilitating the improvement of the subsequent screening efficiency of the metal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall front-view three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of a local vertical section of the present invention; Figure 3 It is a schematic diagram of the overall three-dimensional structure of the present invention from the rear; Figure 4 It is a three-dimensional structural schematic diagram of the bottom view of three vibrating screening components in the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the intermittent feeding mechanism and the material processing mechanism in the present invention; Figure 6 It is a three-dimensional enlarged structural schematic diagram of the driving motor, the transmission gear and the toothless gear in the present invention; Figure 7 It is a schematic diagram of the three-dimensional explosion structure of the material handling mechanism in the present invention; Figure 8 It is a three-dimensional enlarged structural diagram of the control component area in the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure after four material collection drawers are pulled out in the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the connection between the four discharge ports and the collecting cover in the present invention.

[0015] In the figure: 1. Screening box; 2. Slanted frame; 3. Screen; 4. Spring expansion member; 5. Rotating shaft; 6. Cam; 7. L-shaped plate; 8. Frequency conversion motor; 9. Double groove pulley; 10. Single groove pulley; 11. Frequency converter; 12. Transmission belt; 13. Conveying cylinder; 14. Shaft; 15. Spiral conveying blade; 16. Motor bracket; 17. Driving motor; 18. Transmission gear; 19. Gear with missing teeth; 20. Feed bin; 21. Feed hopper; 22 , bearing seat; 23, support plate; 24, dust box; 25, suction fan blades; 26, dust hood; 27, filter element; 28, air supply box; 29, air supply fan blades; 30, heating wire group; 31, wind gathering hood; 32, support frame; 33, transmission shaft; 34, motor positioning plate; 35, control motor; 36, driving bevel gear; 37, driven bevel gear; 38, collection cover; 39, collection drawer; 40, iron block; 41, permanent magnet; 42, inspection door. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Example 1, reference Figure 1-4 and Fig. 9 , a grading and screening device for metal powder processing, comprising a screening box 1 provided with a grading and screening mechanism, a maintenance opening being provided at the front of the screening box 1, and a maintenance door 42 adapted to the maintenance opening being hinged at the front of the screening box 1; Specifically, the grading screening mechanism includes three vibrating screening components arranged in the screening box 1 and distributed at equal distances, and a variable speed driving component arranged outside the screening box 1; More specifically, the vibrating screening assembly includes an inclined frame 2 connected to the inner wall of the screening box 1 through four spring expansion members 4 at the four corners of the bottom, a screen 3 fixedly connected to and adapted to the inclined frame 2, a rotating shaft 5 rotatably mounted in the screening box 1, and two cams 6 fixedly sleeved on the rotating shaft 5 and located below the inclined frame 2; When the vibrating screening assembly is in use, the two cams 6 are driven by the rotating shaft 5 to rotate continuously, so that the two cams 6 squeeze the bottom of the inclined frame 2 and make the four spring telescopic parts 4 elastically deformed, and when the two cams 6 are separated from the inclined frame 2, the inclined frame 2 returns to its original position again under the rebound effect of the four spring telescopic parts 4, and when the two cams 6 rotate again to contact the inclined frame 2, squeezing is formed again, so that the continuous rotation of the two cams 6 will form a reciprocating motion of squeezing, releasing, and squeezing again on the screen 3 installed on the inclined frame 2, so that the screen 3 vibrates to achieve the effect of vibrating screening, which can effectively reduce the blockage of the screen 3 and is conducive to improving the screening efficiency; Furthermore, the sizes of the sieve holes of the three sieves 3 decrease from top to bottom, which makes it easier to grade and screen the metal powder entering the screening box 1, and can orderly separate the metal powder after the grinding process according to the particle size, so as to facilitate screening out a variety of metal powders of different particle sizes and improve the screening effect; More specifically, the variable speed drive assembly includes an L-shaped plate body 7 fixedly connected to the rear outer wall of the screening box 1, a variable frequency motor 8 fixedly mounted on the rear outer wall of the L-shaped plate body 7, a double groove pulley 9 fixedly mounted on one of the rotating shafts 5 located in the middle, two single groove pulleys 10 fixedly mounted on the other two rotating shafts 5, and a frequency converter 11 fixedly mounted on the side wall of the L-shaped plate body 7; Furthermore, the lengths of the three rotating shafts 5 are different. The output shaft of the variable frequency motor 8 penetrates the L-shaped plate 7 and is coaxially fixedly connected to one end of a rotating shaft 5 located in the middle through a coupling. The double-groove pulley 9 is sequentially connected to the two single-groove pulleys 10 through two transmission belts 12. The frequency converter 11 is electrically connected to the variable frequency motor 8. When the variable speed drive assembly is in use, a rotating shaft 5 located in the middle and a double-groove pulley 9 thereon are driven to rotate by a variable frequency motor 8. Under the transmission effect of two transmission belts 12, the other two single-groove pulleys 10 will drive the other two rotating shafts 5 to rotate, so that the cams 6 on the three rotating shafts 5 will rotate together and only need to be controlled by the same motor, which is beneficial to improving the utilization rate of the motor, reducing the deployment and installation cost of the motor, and facilitating subsequent maintenance. The speed of the variable frequency motor 8 can be adjusted by the frequency converter 11, and then the speed of the cams 6 installed on the three rotating shafts 5 can be adjusted, so that the vibration frequency of the three screens 3 can be flexibly adjusted to better meet the screening requirements of different metal powders, which is beneficial to further improve the screening effect.

[0018] Example 2, reference Figure 2-3 and Figure 5-6 , This embodiment is optimized on the basis of embodiment 1, specifically: a grading and screening device for metal powder processing, further comprising an intermittent feeding mechanism; Specifically, the intermittent feeding mechanism includes a conveying cylinder 13, a shaft body 14 rotatably mounted in the conveying cylinder 13, a spiral conveying blade 15 welded on the outer wall of the shaft body 14 and located in the conveying cylinder 13, a motor bracket 16 welded to the side wall of the conveying cylinder 13, a driving motor 17 fixedly mounted on the top outer wall of the motor bracket 16, a transmission gear 18 fixedly sleeved on one end of the shaft body 14, and a toothless gear 19 fixedly sleeved on the output shaft of the driving motor 17 and meshing with the transmission gear 18. A support plate 23 is welded to the top outer wall of the conveying cylinder 13; Furthermore, a bearing seat 22 is welded to the top outer wall of the screening box 1, and the conveying cylinder 13 is welded to the top outer wall of the bearing seat 22. The top end of the conveying cylinder 13 is fixedly connected to the feed bin 20, and the bottom end of the conveying cylinder 13 is fixedly connected to the top of the screening box 1 with a same feeding hopper 21. Furthermore, the toothless gear 19 has a small portion of a toothed surface meshing with the transmission gear 18 and a large portion of a smooth surface without teeth. When the toothed surface of the toothless gear 19 meshes with the transmission gear 18, it will rotate, and when the smooth surface of the toothless gear 19 contacts the transmission gear 18, it will not rotate, so that the spiral conveying blade 15 on the shaft body 14 can rotate intermittently; During the specific implementation of this embodiment: the discharge pipe of the ball mill is extended into the feed bin 20, and the metal powder after grinding will fall into the feed bin 20. Then, the toothless gear 19 is controlled to rotate by the driving motor 17, and then the transmission gear 18 meshing with the toothless gear 19 will drive the spiral conveying blade 15 on the shaft 14 to rotate intermittently, so that the conveying speed and conveying amount of the metal powder can be controlled by intermittent feeding, and the excessive accumulation of metal powder on the screen 3 to affect the screening efficiency can be avoided. In addition, the screening difficulty of the screening equipment can be reduced, the degree of damage to the screening equipment can be reduced, and the service life of the screening equipment can be extended.

[0019] Example 3, reference Figure 1 , Figure 5 and Figure 7-8 , this embodiment is optimized on the basis of embodiment 2, specifically: a grading and screening device for metal powder processing, further comprising a material processing mechanism, the material processing mechanism comprising a dust processing component, a metal powder drying component and a control component; Specifically, the dust handling assembly includes a dust box 24 fixedly connected to the top outer wall of the support plate 23, an air hole opened on one side of the dust box 24, an air suction fan blade 25 arranged in the air hole, a dust hood 26 fixedly connected to the other side of the dust box 24, and a filter element 27 plugged into the dust box 24. One side of the dust hood 26 is connected to a dust head through a dust pipe, and the dust head is located at the feed bin 20. Specifically, the metal powder drying assembly includes an air supply box 28 fixedly connected to the top outer wall of the support plate 23, a through hole opened on one side of the air supply box 28, a supply fan blade 29 arranged in the through hole, a heating wire group 30 fixedly installed in the air supply box 28, and an air collecting cover 31 fixedly connected to the other side of the air supply box 28, and one side of the air collecting cover 31 is connected to the conveying cylinder 13 through an air supply pipe; Specifically, the control assembly includes two support frames 32 fixedly connected to the inner walls of the adjacent sides of the dust box 24 and the air supply box 28 in sequence, a transmission shaft 33 rotatably installed between the two support frames 32, a motor positioning plate 34 welded between the dust box 24 and the air supply box 28, a control motor 35 fixedly installed on the outer wall of the top of the motor positioning plate 34, a driving bevel gear 36 fixedly mounted on the output shaft of the control motor 35, and a driven bevel gear 37 fixedly mounted on the transmission shaft 33 and meshing with the driving bevel gear 36, and the suction fan blades 25 and the air supply fan blades 29 are fixedly mounted on the transmission shaft 33; When the control assembly is in use, the control motor 35 drives the active bevel gear 36 to rotate, and then the driven bevel gear 37 meshing with the active bevel gear 36 drives the suction fan blades 25 and the supply fan blades 29 on the transmission shaft 33 to rotate together; In the specific implementation of this embodiment: first, the discharge pipe of the ball mill is prone to dust overflow during the discharge process. At this time, the suction force generated by the rotation of the suction fan blade 25 can allow the dust head at the feed bin 20 to suck most of the overflowed dust into the dust box 24 through the dust suction pipe, and the dust that subsequently enters will be filtered by the filter element 27. This can effectively reduce the dust overflow caused by the metal powder during the feeding process, which is conducive to reducing dust pollution. Secondly, the metal powder may be affected by moisture due to the influence of the external humid environment during the feeding process. At this time, the air supply operation is performed by rotating the fan blades 29, and the air sent into the air supply box 28 will be heated by the heating wire group 30 to form hot air. The hot air will then pass through the wind collecting hood 31 and gather into the air supply pipe. Finally, the hot air will be continuously transported by the air supply pipe to the conveying cylinder 13 to perform hot air drying on the metal powder in the conveying cylinder 13, thereby effectively improving the conveying efficiency of the metal powder, and also facilitating the improvement of the subsequent screening efficiency of the metal powder.

[0020] Example 4, reference Figure 1 and Figure 9-10 , This embodiment is optimized on the basis of embodiment 1, specifically: a grading and screening device for metal powder processing, further comprising a gathering mechanism; Specifically, the material collection mechanism includes three material discharge ports opened on one side of the screening box 1 and corresponding to the three screens 3, a material collection cover 38 fixedly connected to the outer wall of one side of the screening box 1, and four material collection drawers 39; Furthermore, three of the aggregate drawers 39 are installed in the aggregate cover 38 and are adapted to the positions of the three discharge ports. During the vibration screening process, the metal powder that has not passed through the three screens 3 will be discharged from the bottom of each screen 3 through the discharge port into the three aggregate drawers 39. Another aggregate drawer 39 is installed in the screening box 1 and is located below the grading screening mechanism. The aggregate drawer 39 can collect the metal powder that has passed through the lowest screen 3. It can collect the metal powder with the smallest particle size. The particle size of the metal powder collected in the four aggregate drawers 39 decreases from top to bottom. Furthermore, iron blocks 40 are welded on the four aggregate drawers 39, three permanent magnets 41 are fixedly embedded on one side of the aggregate cover 38, and a permanent magnet 41 is also fixedly embedded in the front lower part of the screening box 1. The four iron blocks 40 are fixedly attracted to the corresponding four permanent magnets 41 respectively. In this way, the firmness of each aggregate drawer 39 can be ensured through the magnetic attraction cooperation between the permanent magnets 41 and the iron blocks 40, thereby preventing the aggregate drawers 39 from slipping out due to vibration during the vibration screening process, thereby affecting the collection of metal powder.

[0021] The use process of the present invention is as follows: first, the discharge pipe of the ball mill is extended into the feed bin 20, and the metal powder after grinding will fall into the feed bin 20, then the toothless gear 19 is controlled to rotate by the driving motor 17, and then the transmission gear 18 meshing with the toothless gear 19 drives the spiral conveying blade 15 on the shaft 14 to rotate intermittently to achieve the effect of intermittent conveying of the metal powder; Secondly, a rotating shaft 5 located in the middle and a double-groove pulley 9 thereon are driven to rotate by a variable frequency motor 8. Under the transmission effect of two transmission belts 12, the other two single-groove pulleys 10 will drive the other two rotating shafts 5 to rotate, so that the cams 6 on the three rotating shafts 5 will rotate together, and then the two cams 6 are driven by the rotating shaft 5 to rotate continuously. The continuous rotation of the two cams 6 will form a reciprocating motion of squeezing, releasing, and squeezing again on the screen 3 installed on the inclined frame 2, so that the screen 3 vibrates to achieve the effect of vibration screening; Finally, under the action of intermittent conveying, the metal powder will enter the screening box 1 from the feeding hopper 21 and be screened in sequence by three vibrating screening components. During the vibrating screening process, the metal powder that has not passed through the three screens 3 will be discharged from the bottom of each screen 3 through the discharge port to the three aggregate drawers 39 on one side, while the metal powder that passes through the bottom screen 3 will fall into the aggregate drawer 39 in front of the screening box 1. In this way, the four aggregate drawers 39 collect large-particle metal powder, medium-particle metal powder, small-particle metal powder and fine-particle metal powder from top to bottom in sequence, so that the metal powder after the grinding process can be separated in order according to the particle size, which is convenient for screening out metal powders of various different particle sizes and improving the screening effect.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A grading and screening device for metal powder processing, comprising a screening box (1), characterized in that: The screening box (1) is provided with a grading screening mechanism, an intermittent feeding mechanism, a material processing mechanism and a material collecting mechanism in sequence; The grading and screening mechanism comprises three vibrating screening components arranged in the screening box (1) and distributed at equal distances, and a variable speed drive component arranged outside the screening box (1), and the material handling mechanism comprises a dust handling component, a metal powder drying component and a control component; The vibrating screening assembly comprises an inclined frame (2) connected to the inner wall of a screening box (1) via four spring expansion members (4) at the four corners of the bottom, a screen (3) fixedly connected to and adapted to the inclined frame (2), a rotating shaft (5) rotatably mounted in the screening box (1), and two cams (6) fixedly sleeved on the rotating shaft (5) and located below the inclined frame (2), wherein the sizes of the screen holes of the three screens (3) decrease in sequence from top to bottom; The variable speed drive assembly comprises an L-shaped plate (7) fixedly connected to the rear outer wall of the screening box (1), a variable frequency motor (8) fixedly mounted on the rear outer wall of the L-shaped plate (7), a double groove pulley (9) fixedly mounted on one of the rotating shafts (5) located in the middle, two single groove pulleys (10) fixedly mounted on the other two rotating shafts (5), and a frequency converter (11) fixedly mounted on the side wall of the L-shaped plate (7); The intermittent feeding mechanism comprises a conveying cylinder (13), a shaft (14) rotatably mounted in the conveying cylinder (13), a spiral conveying blade (15) welded to the outer wall of the shaft (14) and located in the conveying cylinder (13), a motor bracket (16) welded to the side wall of the conveying cylinder (13), a driving motor (17) fixedly mounted on the top outer wall of the motor bracket (16), a transmission gear (18) fixedly mounted on one end of the shaft (14) and a toothless gear (19) fixedly mounted on the output shaft of the driving motor (17) and meshing with the transmission gear (18), and a support plate (23) is welded to the top outer wall of the conveying cylinder (13).

2. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: The three rotating shafts (5) are of different lengths, and the output shaft of the variable frequency motor (8) passes through the L-shaped plate (7) and is coaxially fixedly connected to one end of a rotating shaft (5) located in the middle through a coupling.

3. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: The double-groove pulley (9) is sequentially connected to the two single-groove pulleys (10) via two transmission belts (12), and the frequency converter (11) is electrically connected to the variable frequency motor (8).

4. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: A bearing seat (22) is welded to the top outer wall of the screening box (1), a conveying cylinder (13) is welded to the top outer wall of the bearing seat (22), one end of the top of the conveying cylinder (13) is fixedly connected to a feed bin (20), and a bottom end of the conveying cylinder (13) and the top of the screening box (1) are fixedly connected to a same feeding hopper (21).

5. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: The dust handling assembly comprises a dust collection box (24) fixedly connected to the top outer wall of the support plate (23), an air hole opened on one side of the dust collection box (24), an air suction fan blade (25) arranged in the air hole, a dust collection hood (26) fixedly connected to the other side of the dust collection box (24), and a filter element (27) inserted into the dust collection box (24), and one side of the dust collection hood (26) is connected to a dust collection head via a dust collection pipe.

6. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: The metal powder drying assembly comprises an air supply box (28) fixedly connected to the top outer wall of the support plate (23), a through hole opened on one side of the air supply box (28), a air supply fan blade (29) arranged in the through hole, an electric heating wire group (30) fixedly installed in the air supply box (28), and an air collecting cover (31) fixedly connected to the other side of the air supply box (28), and one side of the air collecting cover (31) is connected to the conveying cylinder (13) through an air supply pipe.

7. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: The control assembly comprises two support frames (32) fixedly connected to the inner walls of adjacent sides of the dust collection box (24) and the air supply box (28), a transmission shaft (33) rotatably mounted between the two support frames (32), a motor positioning plate (34) welded between the dust collection box (24) and the air supply box (28), a control motor (35) fixedly mounted on the outer wall of the top of the motor positioning plate (34), a driving bevel gear (36) fixedly mounted on the output shaft of the control motor (35), and a driven bevel gear (37) fixedly mounted on the transmission shaft (33) and meshing with the driving bevel gear (36), and the suction fan blades (25) and the air supply fan blades (29) are both fixedly mounted on the transmission shaft (33).

8. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: The material collection mechanism comprises three discharge openings opened on one side of the screening box (1) and corresponding to the three screens (3), a material collection cover (38) fixedly connected to the outer wall of one side of the screening box (1), and four material collection drawers (39), wherein three of the material collection drawers (39) are installed in the material collection cover (38) and are adapted to the positions of the three discharge openings, and another material collection drawer (39) is installed in the screening box (1) and is located below the grading screening mechanism.

9. The grading and screening equipment for metal powder processing according to claim 8, characterized in that: Iron blocks (40) are welded to the four material collection drawers (39), three permanent magnets (41) are fixedly embedded on one side of the material collection cover (38), a permanent magnet (41) is also fixedly embedded in the front lower part of the screening box (1), and the four iron blocks (40) are fixedly attracted to the corresponding four permanent magnets (41) respectively.

10. The grading and screening equipment for metal powder processing according to claim 1, characterized in that: The screening box (1) is provided with an inspection opening at the front, and an inspection door (42) adapted to the inspection opening is hingedly connected to the front of the screening box (1).

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