Multi-stage screening device for stainless steel powder

Abstract

The utility model relates to the technical field of screening devices, and discloses a stainless steel powder multi-stage screening device which solves the problem that a screening device cannot conduct multi-stage screening, a servo motor drives a rotating shaft to rotate and drives a second tooth block to rotate, the second tooth block makes contact with a first tooth block in the rotating process, and the second tooth block makes contact with a second tooth block in the rotating process. The first gear block is pushed to drive the second driven rod and the first driven rod to rotate, so that the second driven rod drives the torsion spring to generate torsion, meanwhile, the second driven rod further drives the connecting rod and the knocking blocks at the two ends of the connecting rod to rotate around the axis of the connecting rod till the second gear block rotates till the second gear block stops making contact with the first gear block, and at the moment, the torsion spring rapidly drives the second driven rod to reset; and the second driven rod drives the connecting rod and the knocking blocks at the two ends of the connecting rod to rotate in the opposite direction of the axis of the second driven rod, so that the knocking blocks at the two ends of the connecting rod rapidly collide with the first hit block and the second hit block correspondingly to generate vibration, the operation is repeated, the first sieve plate and the second sieve plate screen and filter metal powder with different sizes on the surfaces, and multi-stage screening is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of screening devices, in particular to a multi-stage screening device for stainless steel powder. Background Art

[0002] Metal powder is the main raw material for powder metallurgy. In order to ensure that the metal powder has a high purity, the metal powder raw materials need to be screened before metallurgical processing.

[0003] The existing Chinese patent with publication number CN221413858U discloses a metal powder screening device. The motor 3 is started and the entire screening sleeve 5 is driven to rotate through the drive shaft 6. During the rotation process, the metal powder accumulated at the bottom can be slowly moved. As the rotation angle and height change, it falls and vibrates fully, and cooperates with the pushing effect of the separation component 8 on the metal powder to complete the screening effect. However, the device cannot perform multi-stage screening of metal powder, which greatly reduces its practicality. Utility Model Content

[0004] The purpose of the utility model is to provide a stainless steel powder multi-stage screening device, which solves the problem that the screening device cannot perform multi-stage screening by adopting the device to work.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stainless steel powder multi-stage screening device, comprising a multi-stage drum, a fixed connecting mechanism is provided on the outside of the multi-stage drum, a bulk material part is provided inside the multi-stage drum, a sieve plate 1 is provided inside the multi-stage drum, a sieve plate 2 is provided inside the multi-stage drum, a vibration assembly is provided inside the multi-stage drum, a striking block 1 is fixedly installed at the lower end of the sieve plate 1, and a striking block 2 is fixedly installed at the upper end of the sieve plate 2, the vibration assembly comprises a knocking mechanism fixedly connected to the multi-stage drum, one side of the knocking mechanism is fixedly installed with a driving mechanism, the knocking mechanism comprises a fixed rod, one end of the fixed rod is fixedly connected to the multi-stage drum, a driven rod 1 is rotatably installed on the other end of the fixed rod, the driven rod 1 is fixedly installed at one end away from the fixed rod, a tooth block 1 is fixedly installed on one side of the driven rod 2, a connecting rod is fixedly installed at one end of the driven rod 2 away from the driven rod 1, knocking blocks are fixedly installed at both ends of the connecting rod, a torsion spring is fixedly installed at one end of the driven rod 2 away from the connecting rod, and the other end of the torsion spring is fixedly connected to the fixed rod. The driving mechanism includes a servo motor, a fixing part is fixedly installed on one side of the servo motor, and the fixing part is fixedly connected to the fixed rod. The output end of the servo motor is fixedly installed with a rotating shaft, and a gear block 2 is fixedly installed on one side of the rotating shaft. The gear block 2 is in active contact with the gear block 1. The rotating shaft is driven by the servo motor to rotate and drive the gear block 2 to rotate. The gear block 2 contacts the gear block 1 during the rotation process and pushes the gear block 1 to drive the driven rod 2 and the driven rod 1 to rotate, causing the driven rod 2 to drive the torsion spring to twist. At the same time, the driven rod 2 also drives the connecting rod and the knocking blocks at both ends thereof to rotate about their own axis until the gear block 2 rotates until it stops contacting the gear block 1. At this time, the torsion spring quickly drives the driven rod 2 to reset, and the driven rod 2 drives the connecting rod and the knocking blocks at both ends thereof to rotate in the opposite direction of their own axis, so that the knocking blocks at both ends of the connecting rod quickly collide with the struck block 1 and the struck block 2 respectively and generate vibration, and so on and so forth, so that the sieve plate 1 and the sieve plate 2 screen and filter metal powders of different sizes on the surface, realizing multi-stage screening and greatly improving the practicality of the device.

[0006] Preferably, the multi-stage cylinder includes a first-level screening cylinder, a screen frame 1 is fixedly installed on the inner wall surface of the first-level screening cylinder, a first-level screen is fixedly installed on the inner side of the screen frame 1, and the impact block 2 is fixedly connected to the lower surface of the first-level screen. The first-level screen is arranged inside the first-level screening cylinder to perform preliminary screening on the metal powder, leaving only large metal powder and filtering out the rest to complete the first-level screening.

[0007] Preferably, a secondary screening cylinder is movably provided at the lower end of the primary screening cylinder, and a tertiary collecting box is movably provided at the lower end of the secondary screening cylinder, a screen frame 2 is fixedly installed on the inner wall surface of the secondary screening cylinder, a secondary screen is fixedly installed on the inner side of the screen frame 2, and the impact block 2 is fixedly connected to the upper surface of the secondary screen. The secondary screen is provided inside the secondary screening cylinder to perform secondary screening on the metal powder, retaining the medium-sized metal powder and filtering out the small ones to complete the secondary screening. The small metal powder eventually falls into the tertiary collecting box, realizing multi-stage screening and improving the practicality of the device.

[0008] Preferably, a conical cover is movably provided on the upper end of the first-stage screening cylinder, a feed port is fixedly installed on the upper end of the conical cover, the bulk material includes a conical disk, a plurality of connecting plates are fixedly installed on the outer side of the conical disk, the connecting plates are fixedly connected to the inner wall of the conical cover, and a plurality of through holes are opened through the interior of the conical disk. When the metal powder enters from the feed port, it contacts the center of the conical disk during the falling process, diffuses and slides around, and finally falls from the plurality of through holes, which effectively disperses the metal powder and prevents it from being accumulated in the center after falling onto the first-stage screen, which is not conducive to screening it.

[0009] Preferably, the outer sides of both ends of the first-stage screening drum are fixedly installed with connecting ring plates, the outer sides of both ends of the second-stage screening drum are fixedly installed with connecting ring plates, the outer side of one end of the conical cover close to the first-stage screening drum is fixedly installed with a connecting ring plate, and the outer side of one end of the third-stage collecting box close to the second-stage screening drum is fixedly installed with a connecting ring plate. The fixed connection mechanism includes a semicircular ring 1 and a semicircular ring 2, one end of the semicircular ring 1 is fixedly installed with a connecting key 1, one end of the semicircular ring 2 is fixedly installed with a connecting key 2, the connecting key 1 is rotatably connected to the connecting key 2, and the other end of the semicircular ring 1 is fixedly installed It is equipped with a connecting shaft, and a bolt is rotatably installed on the outer side of the connecting shaft. A baffle is fixedly installed on the other end of the semicircular ring two, and a nut is installed on the outer thread of the bolt. An annular groove is provided inside the semicircular ring one and the semicircular ring two, and the annular groove matches the connecting ring plate. There are multiple groups of fixed connection mechanisms, and the structural composition and function are exactly the same. Align the annular grooves in the semicircular ring one and the semicircular ring two with the connecting ring plate at the connection, then pass the bolt through the baffle, and then align the nut with the bolt and screw it on until it is tight with the baffle to complete the assembly between the multi-stage cylinders, which is very convenient.

[0010] Preferably, a material guide pipe is fixedly installed on the outer side of the first-level screening cylinder and the second-level screening cylinder, and a discharge port is fixedly installed on the lower end of the material guide pipe. The material guide pipe is connected with the interior of the first-level screening cylinder and the second-level screening cylinder, and the sieve plate 1 and the sieve plate 2 are arranged at an angle, and are connected with the interior of the first-level screening cylinder and the second-level screening cylinder through the material guide pipe, and the sieve plate 1 and the sieve plate 2 are both inclined toward the material guide pipe, so that the screened metal powder slides into the material pipe during the vibration process and finally falls out from the discharge port, thereby further improving the degree of automation of the device.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the servo motor drives the rotating shaft to rotate and drives the gear block 2 to rotate. The gear block 2 contacts the gear block 1 during the rotation process, and pushes the gear block 1 to drive the driven rod 2 and the driven rod 1 to rotate, causing the driven rod 2 to drive the torsion spring to twist. At the same time, the driven rod 2 also drives the connecting rod and the knocking blocks at both ends of it to rotate around its own axis until the gear block 2 rotates until it stops contacting the gear block 1. At this time, the torsion spring quickly drives the driven rod 2 to reset, and the driven rod 2 drives the connecting rod and the knocking blocks at both ends of it to rotate in the opposite direction of its own axis, so that the knocking blocks at both ends of the connecting rod quickly collide with the struck block 1 and the struck block 2 respectively and generate vibration, and so on, so that the screen plate 1 and the screen plate 2 screen and filter metal powders of different sizes on the surface, realizing multi-stage screening and greatly improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model proposes a stainless steel powder multi-stage screening device.

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the multi-stage cylinder structure of the utility model;

[0016] Figure 4 This is a structural diagram of the fixed connection mechanism of the utility model;

[0017] Figure 5 This is a schematic diagram of the bulk material structure of the utility model;

[0018] Figure 6 This is a structural diagram of a screen plate of the present invention;

[0019] Figure 7 This is a schematic diagram of the second structure of the screen plate of the present utility model;

[0020] Figure 8 This is a schematic structural diagram of the vibration component of the present utility model.

[0021] In the figure: 1. Multi-stage cylinder; 11. First-stage screening cylinder; 12. Conical cover; 13. Feed port; 14. Second-stage screening cylinder; 15. Material guide pipe; 16. Discharge port; 17. Connecting ring plate; 18. Third-stage collecting box; 2. Fixed connecting mechanism; 21. Semicircular ring 1; 22. Semicircular ring 2; 23. Connecting key 1; 24. Connecting key 2; 25. Ring groove; 26. Connecting shaft; 27. Bolt; 28. Baffle; 29. ​​Nut; 3. Bulk material parts; 31. Conical disk; 32. Connecting plate; 33. Through hole; 4 , sieve plate one; 41. sieve frame one; 42. primary sieve; 43. striking block one; 5. sieve plate two; 51. sieve frame two; 52. secondary sieve; 53. striking block two; 6. vibration assembly; 61. striking mechanism; 611. fixed rod; 612. driven rod one; 613. driven rod two; 614. gear block one; 615. connecting rod; 616. striking block; 617. torsion spring; 62. driving mechanism; 621. fixing part; 622. servo motor; 623. rotating shaft; 624. gear block two. DETAILED DESCRIPTION

[0022] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0023] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0024] Combine Figure 1-2 、 Figure 6-8A stainless steel powder multi-stage screening device includes a multi-stage cylinder 1, a fixed connection mechanism 2 is provided on the outside of the multi-stage cylinder 1, a bulk material part 3 is provided inside the multi-stage cylinder 1, a sieve plate 1 4 is provided inside the multi-stage cylinder 1, a sieve plate 2 5 is provided inside the multi-stage cylinder 1, a vibration component 6 is provided inside the multi-stage cylinder 1, a striking block 1 43 is fixedly installed on the lower end of the sieve plate 1 4, and a striking block 2 53 is fixedly installed on the upper end of the sieve plate 2 5. The vibration component 6 includes a knocking mechanism 61 fixedly connected to the multi-stage cylinder 1, a driving mechanism 62 is fixedly installed on one side of the knocking mechanism 61, and the knocking mechanism 61 includes a fixed rod 611, one end of the fixed rod 611 is fixed to the The multi-stage cylinder 1 is fixedly connected, and the other end of the fixed rod 611 is rotatably mounted with a driven rod 1 612, and the end of the driven rod 1 612 away from the fixed rod 611 is fixedly mounted with a driven rod 2 613, and one side of the driven rod 2 613 is fixedly mounted with a tooth block 1 614, and the end of the driven rod 2 613 away from the driven rod 1 612 is fixedly mounted with a connecting rod 615, and both ends of the connecting rod 615 are fixedly mounted with a knocking block 616, and the end of the driven rod 2 613 away from the connecting rod 615 is fixedly mounted with a torsion spring 617, and the other end of the torsion spring 617 is fixedly connected to the fixed rod 611. The driving mechanism 62 includes a servo motor 622, and the servo motor 622 A fixing piece 621 is fixedly installed on one side of the servo motor 622, and the fixing piece 621 is fixedly connected to the fixing rod 611. A rotating shaft 623 is fixedly installed on the output end of the servo motor 622. A tooth block 2 624 is fixedly installed on one side of the rotating shaft 623. The tooth block 2 624 is in active contact with the tooth block 1 614. The servo motor 622 drives the rotating shaft 623 to rotate and drives the tooth block 2 624 to rotate. During the rotation process, the tooth block 2 624 contacts the tooth block 1 614 and pushes the tooth block 1 614 to drive the driven rod 2 613 and the driven rod 1 612 to rotate, causing the driven rod 2 613 to drive the torsion spring 617 to twist. At the same time, the driven rod 2 613 also The connecting rod 615 and the knocking blocks 616 at both ends thereof are driven to rotate about their own axis until the tooth block 2 624 rotates until it stops contacting the tooth block 1 614. At this time, the torsion spring 617 quickly drives the driven rod 2 613 to reset. The driven rod 2 613 drives the connecting rod 615 and the knocking blocks 616 at both ends thereof to rotate in the opposite direction of their own axis, so that the knocking blocks 616 at both ends of the connecting rod 615 quickly collide with the struck block 1 43 and the struck block 2 53 respectively and generate vibration, and so on and so forth, so that the sieve plate 1 4 and the sieve plate 2 5 can screen and filter the metal powders of different sizes on the surface, thereby realizing multi-stage screening and greatly improving the practicality of the device.

[0025] Combine Figure 3 、 Figure 6-7The multi-stage drum 1 includes a first-stage screening drum 11. A screen frame 41 is fixedly installed on the inner wall surface of the first-stage screening drum 11. A first-stage screen 42 is fixedly installed on the inner side of the screen frame 41. The impact block 2 53 is fixedly connected to the lower surface of the first-stage screen 42. The first-stage screen 42 is arranged inside the first-stage screening drum 11 to perform preliminary screening on the metal powder. Only large metal powder is left, and the rest is filtered out to complete the first-stage screening.

[0026] Combine Figure 3 、 Figure 7 The lower end of the first-level screening cylinder 11 is movably provided with a second-level screening cylinder 14, and the lower end of the second-level screening cylinder 14 is movably provided with a third-level collecting box 18. A screen frame 2 51 is fixedly installed on the inner wall surface of the second-level screening cylinder 14, and a second-level screen 52 is fixedly installed on the inner side of the screen frame 2 51. The impact block 2 53 is fixedly connected to the upper surface of the second-level screen 52. The second-level screen 52 is provided inside the second-level screening cylinder 14 to perform secondary screening on the metal powder, leaving the medium-sized metal powder and filtering out the small ones to complete the secondary screening. The small metal powder finally falls into the third-level collecting box 18, realizing multi-stage screening and improving the practicality of the device.

[0027] Combine Figure 3 、 Figure 5-6 The upper end of the first-level screening cylinder 11 is movably provided with a conical cover 12, and the upper end of the conical cover 12 is fixedly installed with a feed port 13. The bulk material part 3 includes a conical disk 31, and a plurality of connecting plates 32 are fixedly installed on the outer side of the conical disk 31. The connecting plates 32 are fixedly connected to the inner wall of the conical cover 12. A plurality of through holes 33 are opened through the interior of the conical disk 31. When the metal powder enters from the feed port 13, it contacts the center of the conical disk 31 during the falling process, and diffuses and slides around, and finally falls from the plurality of through holes 33, which effectively disperses the metal powder and prevents it from falling onto the first-level screen 42 and being accumulated in the center, which is not conducive to screening it.

[0028] Combine Figure 3-4, both ends of the first-stage screening drum 11 are fixedly installed with connecting ring plates 17 on the outside, both ends of the second-stage screening drum 14 are fixedly installed with connecting ring plates 17 on the outside, the conical cover 12 is fixedly installed with a connecting ring plate 17 on the outside of one end close to the first-stage screening drum 11, and the tertiary collecting box 18 is fixedly installed with a connecting ring plate 17 on the outside of one end close to the second-stage screening drum 14. The fixed connection mechanism 2 includes a semicircular ring 1 21 and a semicircular ring 2 22. One end of the semicircular ring 1 21 is fixedly installed with a connecting key 1 23, and one end of the semicircular ring 2 22 is fixedly installed with a connecting key 2 24. The connecting key 1 23 is rotatably connected to the connecting key 2 24, and the other end of the semicircular ring 1 21 is fixedly installed with a connecting shaft 26. A bolt 27 is rotatably installed on the outer side of the connecting shaft 26. A baffle 28 is fixedly installed on the other end of the semicircular ring 22. A nut 29 is threadedly installed on the outer side of the bolt 27. An annular groove 25 is provided inside the semicircular ring 1 21 and the semicircular ring 22. The annular groove 25 matches the connecting ring plate 17. There are multiple groups of fixed connection mechanisms 2, and the structural composition and function are exactly the same. Align the annular grooves 25 in the semicircular ring 1 21 and the semicircular ring 22 with the connecting ring plate 17 at the connection, then pass the bolt 27 through the baffle 28, and then align the nut 29 with the bolt 27 and screw it on until it is tight with the baffle 28. The assembly between the multi-stage cylinder 1 is completed, which is very convenient.

[0029] Combine Figure 3 A material guide pipe 15 is fixedly installed on the outside of the first-level screening drum 11 and the second-level screening drum 14, and a discharge port 16 is fixedly installed at the lower end of the material guide pipe 15. The material guide pipe 15 is connected with the interior of the first-level screening drum 11 and the second-level screening drum 14, and the sieve plate 14 and the sieve plate 2 5 are arranged at an angle. They are connected with the interior of the first-level screening drum 11 and the second-level screening drum 14 through the material guide pipe 15, and the sieve plate 14 and the sieve plate 2 5 are inclined toward the material guide pipe 15, so that the screened metal powder slides into the material pipe 15 during the vibration process, and finally falls out from the discharge port 16, further improving the degree of automation of the device.

[0030] The specific working process and principle of the utility model are as follows: first, align the annular grooves 25 in the semicircular ring 1 21 and the semicircular ring 2 2 with the connecting ring plate 17 at the connection, then pass the bolt 27 through the baffle 28, and then align the nut 29 with the bolt 27 and screw it on until it is tightly pressed against the baffle 28 to complete the assembly between the multi-stage cylinder 1. Then, when the metal powder enters from the feed port 13, it contacts the center of the conical disk 31 during the falling process, and spreads and slides to the surroundings, and finally falls from the multiple through holes 33, which effectively disperses the metal powder and prevents it from falling onto the first-level screen 42 and then piling up in the center. Then, the servo motor 622 drives the rotating shaft 623 to rotate and drives the gear block 2 624 to rotate. The gear block 2 624 contacts the gear block 1 614 during the rotation process. , and pushes the tooth block 1 614 to drive the driven rod 2 613 and the driven rod 1 612 to rotate, causing the driven rod 2 613 to drive the torsion spring 617 to twist, and at the same time, the driven rod 2 613 also drives the connecting rod 615 and the knocking blocks 616 at both ends thereof to rotate around their own axes, until the tooth block 2 624 rotates until it stops contacting the tooth block 1 614. At this time, the torsion spring 617 quickly drives the driven rod 2 613 to reset, and the driven rod 2 613 drives the connecting rod 615 and the knocking blocks 616 at both ends thereof to rotate in the opposite direction of their own axes, so that the knocking blocks 616 at both ends of the connecting rod 615 quickly collide with the struck block 1 43 and the struck block 2 53 respectively and generate vibration, completing the screening while the metal powder slides into the material tube 15 and finally falls out from the discharge port 16.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stainless steel powder multi-stage screening device, comprising a multi-stage cylinder (1), a fixed connection mechanism (2) provided on the outside of the multi-stage cylinder (1), a bulk material member (3) provided inside the multi-stage cylinder (1), a sieve plate 1 (4) provided inside the multi-stage cylinder (1), a sieve plate 2 (5) provided inside the multi-stage cylinder (1), and a vibration assembly (6) provided inside the multi-stage cylinder (1), characterized in that: The lower end of the sieve plate 1 (4) is fixedly mounted with a striking block 1 (43), the upper end of the sieve plate 2 (5) is fixedly mounted with a striking block 2 (53), the vibration assembly (6) comprises a striking mechanism (61) fixedly connected to the multi-stage cylinder (1), a driving mechanism (62) is fixedly mounted on one side of the striking mechanism (61), the striking mechanism (61) comprises a fixed rod (611), one end of the fixed rod (611) is fixedly connected to the multi-stage cylinder (1), the other end of the fixed rod (611) is rotatably mounted with a driven rod 1 (612), the end of the driven rod 1 (612) away from the fixed rod (611) is fixedly mounted with a driven rod 2 (613), a side of the driven rod 2 (613) is fixedly mounted with a tooth block 1 (614), and the driven rod 2 (613) is away from the driven rod A connecting rod (615) is fixedly installed at one end of the first (612), and knocking blocks (616) are fixedly installed at both ends of the connecting rod (615). A torsion spring (617) is fixedly installed at one end of the second driven rod (613) away from the connecting rod (615), and the other end of the torsion spring (617) is fixedly connected to the fixed rod (611). The driving mechanism (62) includes a servo motor (622), a fixing member (621) is fixedly installed on one side of the servo motor (622), and the fixing member (621) is fixedly connected to the fixed rod (611). A rotating shaft (623) is fixedly installed at the output end of the servo motor (622), and a tooth block (624) is fixedly installed on one side of the rotating shaft (623). The tooth block (624) is in movable contact with the tooth block (614).

2. The multi-stage screening device for stainless steel powder according to claim 1, characterized in that: The multi-stage drum (1) comprises a first-stage screening drum (11), a screen frame (41) is fixedly mounted on the inner wall surface of the first-stage screening drum (11), a first-stage screen (42) is fixedly mounted on the inner side of the screen frame (41), and a second impact block (53) is fixedly connected to the lower surface of the first-stage screen (42).

3. The multi-stage screening device for stainless steel powder according to claim 2, characterized in that: The lower end of the primary screening cylinder (11) is movably provided with a secondary screening cylinder (14), the lower end of the secondary screening cylinder (14) is movably provided with a tertiary collecting box (18), the inner wall surface of the secondary screening cylinder (14) is fixedly provided with a second screen frame (51), the inner side of the second screen frame (51) is fixedly provided with a secondary screen (52), and the second impact block (53) is fixedly connected to the upper surface of the secondary screen (52).

4. The multi-stage screening device for stainless steel powder according to claim 2, characterized in that: The upper end of the primary screening drum (11) is movably provided with a conical cover (12), and the upper end of the conical cover (12) is fixedly provided with a feed port (13). The bulk material piece (3) comprises a conical disk (31), and a plurality of connecting plates (32) are fixedly provided on the outer side of the conical disk (31). The connecting plates (32) are fixedly connected to the inner wall of the conical cover (12), and a plurality of through holes (33) are provided through the interior of the conical disk (31).

5. The multi-stage screening device for stainless steel powder according to claim 2, characterized in that: The outer sides of both ends of the first-stage screening cylinder (11) are fixedly mounted with connecting ring plates (17), the outer sides of both ends of the second-stage screening cylinder (14) are fixedly mounted with connecting ring plates (17), the outer side of one end of the conical cover (12) close to the first-stage screening cylinder (11) is fixedly mounted with a connecting ring plate (17), the outer side of one end of the third-stage collecting box (18) close to the second-stage screening cylinder (14) is fixedly mounted with a connecting ring plate (17), the fixed connection mechanism (2) comprises a semicircular ring 1 (21) and a semicircular ring 2 (22), and one end of the semicircular ring 1 (21) is fixedly mounted with a connecting key 1 (23) One end of the semicircular ring 2 (22) is fixedly installed with a connecting key 2 (24), the connecting key 1 (23) is rotatably connected to the connecting key 2 (24), the other end of the semicircular ring 1 (21) is fixedly installed with a connecting shaft (26), the outer side of the connecting shaft (26) is rotatably installed with a bolt (27), the other end of the semicircular ring 2 (22) is fixedly installed with a baffle (28), the outer side of the bolt (27) is threadedly installed with a nut (29), and the interior of the semicircular ring 1 (21) and the semicircular ring 2 (22) are both provided with an annular groove (25), and the annular groove (25) matches the connecting ring plate (17).

6. The multi-stage screening device for stainless steel powder according to claim 2, characterized in that: A material guide pipe (15) is fixedly installed on the outer side of the primary screening drum (11) and the secondary screening drum (14), and a material discharge port (16) is fixedly installed at the lower end of the material guide pipe (15). The material guide pipe (15) is communicated with the interior of the primary screening drum (11) and the secondary screening drum (14), and the sieve plate 1 (4) and the sieve plate 2 (5) are arranged in an inclined manner.

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