Metal powder grading equipment

Abstract

The invention discloses metal powder grading equipment, relates to the field of metal powder sorting, and solves the problems that when the existing metal powder grading equipment is used, sieve holes are difficult to clean synchronously in the sorting process, and the cleaned blockages are difficult to separate and output to a set position for secondary sorting, the metal powder grading equipment comprises a machine body and a grading mechanism, a vibrating tube is arranged in the machine body, the grading mechanism comprises a screening barrel, a first conveying screw and a driving part, a plurality of sets of output grooves are formed in the machine body, and a conveying groove and a recycling groove are formed in the vibrating tube. And meanwhile, the driving piece is controlled to drive the screening barrel to rotate reversely, the blocked screening holes are rotated to the upper side position, powder in the screening holes is shaken off into the recycling groove through the shaking pipe to be recycled, and the powder is input into the conveying groove again at the needed position to be screened again.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal powder sorting, in particular to a metal powder grading device. BACKGROUND

[0002] 3D printing (3DP) is a kind of rapid prototyping technology, also known as additive manufacturing, which is a technology that uses powder-like metal or plastic and other materials that can be bonded to construct objects through layer-by-layer printing based on digital model files. After atomization processing, the powder material needs to be screened to select the powder that meets the particle size requirements.

[0003] In the prior art, a vibrating screen is usually used to grade and screen the powder by gravity or a wind conveying method is used for screening. In these screening methods, some particles with a size slightly larger than the screen hole will enter the screen hole and block the screen. The existing equipment has a relatively low efficiency when unclogging the screen hole, and the removed particles cannot be separated and output, so they fall into the original screen and mix with the metal powder to be screened, increasing the difficulty of screening and reducing the efficiency of subsequent screening. At the same time, these particles are easy to enter the screen hole again, increasing the probability of repeated blocking. SUMMARY

[0004] The purpose of the present application is to provide a metal powder grading device that can conveniently self-clean the screen hole and separate and output the blocking particles, thereby improving the screening efficiency, to solve the problems raised in the background.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a metal powder grading equipment, comprising a body and a grading mechanism, a shaking tube is arranged in the body, the grading mechanism comprises a plurality of sieve drums movably sleeved with the outer wall of the shaking tube, a plurality of output grooves are arranged in the body, a conveying groove capable of communicating with the output grooves is formed in the shaking tube, a recovery groove is formed in the upper side of the shaking tube, a first conveying screw is rotatably connected in the conveying groove, a driving member for driving the sieve drums to intermittently lift and shake while driving the first conveying screw and the sieve drums to continuously rotate in opposite directions is arranged in the body, the grading mechanism can input metal powder into the conveying groove, convey the metal powder through the rotation of the first conveying screw, grade and sieve the metal powder by the sieve drums, output from the corresponding output grooves, and control the driving member to drive the sieve drums to rotate in the opposite direction to switch the position of the sieve hole, rotate the blocked sieve hole to the upper position, shake the powder in the sieve hole through the shaking tube to fall into the recovery groove for recovery and input again into the conveying groove at the required position for re-sieving, improve the grading efficiency, facilitate self-cleaning of the sieve hole while separating and outputting the blocked particles, and improve the sieving efficiency.

[0006] Preferably, the grading mechanism further comprises a plurality of partition plates fixedly installed in the body, the partition plates are respectively located between adjacent output grooves, a partition frame is fixedly connected to the upper side of the partition plate, a sliding groove is formed in the partition frame, a sliding plate is slidably connected in the vertical direction in the sliding groove, a positioning ring is fixedly connected to the sliding plate, the outer wall of the sieve drum movably sleeves the inner wall of the positioning ring, a mounting member for assembling the sieve drums is arranged in the body, and a conveying member for assisting raw material conveying is arranged in the body, so as to facilitate separate output of metal powder with different particle sizes.

[0007] Preferably, the conveying member comprises an end plate fixedly installed at one end of the shaking tube, an inlet hopper is fixedly connected to the body, a connecting frame is slidably connected to the outer wall of the bottom end of the inlet hopper in the vertical direction, one end of the connecting frame is fixedly connected to the side surface of the end plate, and the two ends of the connecting frame are respectively connected with the inlet hopper and the shaking tube, so as to facilitate auxiliary raw material conveying.

[0008] Preferably, the mounting member comprises a mounting ring rotatably connected with the outer wall of the end plate, the two ends of the sieve drum are respectively provided with a plug-in block capable of being plugged with adjacent sieve drums, the inner wall of the mounting ring is provided with a plug-in groove capable of being butt-jointed with the plug-in block on the side surface of the adjacent sieve drum, and the connection position of the adjacent sieve drums is located in the positioning ring, so as to facilitate assembly of the sieve drums.

[0009] Preferably, the driving member comprises a first rotating shaft coaxially fixedly installed on the first conveying screw, the machine body is rotationally connected with a second rotating shaft, the second rotating shaft penetrates through a plurality of the partition plates and is rotationally connected with the partition plates, one end of the first rotating shaft is coaxially fixedly connected with a first worm wheel, one end of the second rotating shaft is coaxially fixedly connected with a second worm wheel, the machine body is rotationally connected with a worm that is in transmission with the first worm wheel and the second worm wheel, the first rotating shaft is provided with a control member for driving the mounting ring to rotate and conveying the powder in the recovery groove at the same time, the second rotating shaft is provided with a shaking member for driving the shaking pipe to shake and assisting in outputting the screened powder at the same time, the first conveying screw and the screening drum are continuously rotated while the screening drum is intermittently lifted and shaken, and the rotating direction of the first conveying screw is opposite to the rotating direction of the screening drum.

[0010] Preferably, the control member comprises an inner gear ring fixedly installed on the mounting ring, the first rotating shaft is coaxially fixedly connected with a first gear, the end plate is rotationally connected with a second gear in mesh with the first gear and the inner gear ring, the end plate is rotationally connected with a plurality of rotating rods, the outer wall of the rotating rod is fixedly connected with a second conveying screw rotationally fitted with the inner wall of the recovery groove, the rotating rod is coaxially fixedly connected with a third gear in mesh with the inner gear ring, the shaking pipe is provided with a plurality of recovery openings for connecting the recovery groove and the conveying groove, and the recovery openings are located at the connection of adjacent screening drums, so as to drive the mounting ring to rotate and convey the powder in the recovery groove at the same time.

[0011] Preferably, the shaking member comprises a plurality of shaking discs rotationally connected with the inner walls of the partition plates, respectively, the shaking disc is uniformly provided with a plurality of shaking grooves, the bottom end of the sliding plate is fixedly connected with a shaking block, and a plurality of the shaking discs are coaxially fixedly installed on the second rotating shaft, respectively, so as to drive the shaking pipe to shake and assist in outputting the screened powder at the same time.

[0012] Preferably, the mounting member further comprises a plug-in pipe capable of being plugged with the plug-in block at one end of the screening drum, the plug-in pipe is uniformly provided with a plurality of output holes, a threaded cover plate is threadedly connected with one of the positioning rings away from the feeding hopper, and one end of the plug-in pipe can rotationally fit with the inner wall of the threaded cover plate, so as to position and install the end of the screening drum away from the feeding hopper.

[0013] Preferably, the shaking member further comprises a plurality of driving leaves coaxially fixedly installed on the second rotating shaft, and a plurality of the driving leaves are located in different output grooves, respectively, so as to assist in driving the powder in the output groove to one side.

[0014] Preferably, the driving member further comprises a driving motor fixedly installed in the machine body, and an output end of the driving motor is coaxially and fixedly connected with one end of the worm, so as to drive the worm to rotate.

[0015] Compared with the prior art, the present application has the following advantages: The metal powder grading equipment provided by the present application solves the problem that the existing metal powder grading equipment is difficult to clean the screen hole during the sorting process and automatically separate and output the blockage to a set position for secondary sorting, by inputting the metal powder into the conveying groove through the grading mechanism, conveying by the rotation of the first conveying screw, grading and screening the metal powder by the screening cylinder, outputting from the corresponding output groove, simultaneously controlling the driving member to drive the screening cylinder to rotate reversely, switching the position of the screen hole, rotating the blocked screen hole to the upper position, and shaking the screen hole through the shaking pipe to shake off the powder in the screen hole into the recovery groove for recovery and inputting into the conveying groove again at the required position for re-screening, while avoiding the blockage from re-entering the original screening cylinder to block, thereby improving the grading efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0017] Figure 2 It is a schematic diagram of the structure of the thread cover plate in the open state of the present application.

[0018] Figure 3 It is a schematic diagram of the internal structure of the machine body of the present application.

[0019] Figure 4 It is a schematic diagram of the internal structure of the machine body of the present application. Figure 3 It is an enlarged view of area A in the middle.

[0020] Figure 5 It is an exploded view of the partial structure of the grading mechanism of the present application.

[0021] Figure 6 It is a schematic diagram of the partial structure of the driving member of the present application.

[0022] Figure 7 It is a schematic diagram of the partial structure of the mounting member of the present application.

[0023] Figure 8 It is a schematic diagram of the partial structure of the mounting member of the present application. Figure 7 It is an enlarged view of area B in the middle.

[0024] Figure 9 It is a schematic diagram of the partial structure of the conveying member of the present application.

[0025] Figure 10 It is an exploded view of the partial structure of the mounting member of the present application.

[0026] Figure 11Partial structure sectional view of conveying part of the present application.

[0027] Figure 12 Partial structure exploded view of driving part of the present application.

[0028] In the figure: 1-body; 2-shaking pipe; 3-classification mechanism; 4-screening cylinder; 5-output slot; 6-conveying slot; 7-recovery slot; 8-first conveying screw; 9-driving part; 10-separation plate; 11-separation frame; 12-sliding slot; 13-sliding plate; 14-positioning ring; 15-mounting part; 16-conveying part; 17-end plate; 18-feeding hopper; 19-connecting frame; 20-mounting ring; 21-insertion block; 22-insertion slot; 23-first rotating shaft; 24-second rotating shaft; 25-first worm gear; 26-second worm gear; 27-worm; 30-inner tooth ring; 31-first gear; 32-second gear; 33-rotating rod; 34-second conveying screw; 35-third gear; 36-recovery port; 37-shaking disc; 38-shaking slot; 39-shaking block; 40-insertion pipe; 41-output hole; 42-threaded cover plate; 43-driving blade; 44-driving motor. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0030] Please refer to Figures 1-12 The present application provides a technical solution: a metal powder classification equipment, comprising a body 1 and a classification mechanism 3, the body 1 is provided with a shaking pipe 2, the classification mechanism 3 comprises a plurality of groups of screening cylinders 4 movably sleeved with the outer wall of the shaking pipe 2, the body 1 is provided with a plurality of groups of output slots 5, the shaking pipe 2 is provided with a conveying slot 6 capable of communicating with the output slots 5, the upper side of the shaking pipe 2 is provided with a recovery slot 7, the conveying slot 6 is rotatably connected with a first conveying screw 8, the body 1 is provided with a driving part 9 for driving the screening cylinders 4 to intermittently lift and shake, simultaneously driving the first conveying screw 8 and the screening cylinders 4 to continuously rotate, and keeping the rotating direction of the first conveying screw 8 opposite to the rotating direction of the screening cylinders 4, the classification mechanism 3 can input metal powder into the conveying slot 6, convey the metal powder through the rotation of the first conveying screw 8, so that the screening cylinders 4 classify and screen the metal powder, output from the corresponding output slots 5, at the same time, control the driving part 9 to drive the screening cylinders 4 to rotate reversely, switch the position of the screen hole, rotate the blocked screen hole to the upper position, through the shaking of the shaking pipe 2, shake the powder in the screen hole to fall into the recovery slot 7 for recovery and input again into the conveying slot 6 at the required position for re-screening, thereby improving the classification efficiency.

[0031] The grading mechanism 3 further comprises a plurality of sets of partition plates 10 fixedly installed inside the body 1, the partition plates 10 being respectively located between adjacent output grooves 5, the upper side of each partition plate 10 being fixedly connected with a partition frame 11, a sliding groove 12 being formed in the partition frame 11, a sliding plate 13 being slidably connected in the vertical direction in the sliding groove 12, the sliding plate 13 being fixedly connected with a positioning ring 14, the outer wall of the screening cylinder 4 being movably sleeved with the inner wall of the positioning ring 14, the body 1 being provided with a mounting piece 15 for assembling the screening cylinder 4, and the body 1 being provided with a conveying piece 16 for assisting in conveying raw materials.

[0032] The conveying piece 16 comprises an end plate 17 fixedly installed at one end of the shaking pipe 2, the body 1 being fixedly connected with an inlet hopper 18, the bottom end of the outer wall of the inlet hopper 18 being slidably connected with a connecting frame 19 in the vertical direction, one end of the connecting frame 19 being fixedly connected with the side surface of the end plate 17, and both ends of the connecting frame 19 being respectively communicated with the inlet hopper 18 and the shaking pipe 2.

[0033] The mounting piece 15 comprises a mounting ring 20 rotatably connected with the outer wall of the end plate 17, both ends of the screening cylinder 4 being respectively provided with a plug-in block 21 capable of being plugged with adjacent screening cylinders 4, the inner wall of the mounting ring 20 being provided with a plug-in groove 22 capable of being butt-jointed with the plug-in block 21 of the side surface of the adjacent screening cylinder 4, and the connecting position of the adjacent screening cylinder 4 being located in the positioning ring 14.

[0034] The driving piece 9 comprises a first rotating shaft 23 coaxially fixedly installed on the first conveying screw 8, a second rotating shaft 24 being rotatably connected in the body 1, the second rotating shaft 24 penetrating through a plurality of sets of partition plates 10 and being rotatably connected with the partition plates 10, one end of the first rotating shaft 23 being coaxially fixedly connected with a first worm gear 25, one end of the second rotating shaft 24 being coaxially fixedly connected with a second worm gear 26, a worm 27 being rotatably connected in the body 1 and being in meshing transmission with the first worm gear 25 and the second worm gear 26, the driving piece 9 further comprising a driving motor 44 fixedly installed in the body 1, the model of the driving motor 44 being preferably YYHS-40, the output end of the driving motor 44 being coaxially fixedly connected with one end of the worm 27, the first rotating shaft 23 being provided with a control piece for driving the mounting ring 20 to rotate while conveying the powder in the recovery groove 7, and the second rotating shaft 24 being provided with a shaking piece for driving the shaking pipe 2 to shake while assisting in outputting the screened powder.

[0035] The control member comprises an inner tooth ring 30 fixedly installed on the mounting ring 20, a first gear 31 coaxially and fixedly connected to the first rotating shaft 23, a second gear 32 rotatably connected to the end plate 17 and engaged with the first gear 31 and the inner tooth ring 30, a plurality of rotating rods 33 rotatably connected to the end plate 17, a second conveying spiral 34 fixedly connected to the outer wall of the rotating rod 33 and rotatably abutting the inner wall of the recovery groove 7, a third gear 35 coaxially and fixedly connected to the rotating rod 33 and engaged with the inner tooth ring 30, and a plurality of recovery openings 36 formed in the shaking pipe 2 and used for connecting the recovery groove 7 and the conveying groove 6, the recovery openings 36 being located at the connection positions of adjacent screening cylinders 4.

[0036] The shaking member comprises a plurality of shaking discs 37 rotatably connected to the inner wall of the partition plate 10, a plurality of shaking grooves 38 uniformly formed in the shaking disc 37, a shaking block 39 fixedly connected to the bottom end of the sliding plate 13, and a plurality of driving leaves 43 coaxially and fixedly installed on the second rotating shaft 24, the plurality of driving leaves 43 being located in different output grooves 5.

[0037] The mounting member 15 further comprises a plug-in pipe 40 capable of being plugged with the plug-in block 21 at one end of the screening cylinder 4, a plurality of output holes 41 uniformly formed in the plug-in pipe 40, a threaded cover plate 42 threadedly connected to one of the plurality of positioning rings 14 away from the inlet hopper 18, and one end of the plug-in pipe 40 capable of being rotatably abutted with the inner wall of the threaded cover plate 42.

[0038] In this embodiment, the metal powder to be classified is input from the inlet hopper 18 into the connecting frame 19, conveyed into the conveying groove 6 through the connecting frame 19, and the driving motor 44 is started to drive the worm 27 to rotate, thereby synchronously rotating the first worm gear 25 and the second worm gear 26, driving the first rotating shaft 23 and the second rotating shaft 24 to rotate, and driving the shaking disc 37 to rotate through the second rotating shaft 24. When the outer wall of the shaking disc 37 abuts the shaking block 39, the shaking block 39 is lifted together with the sliding plate 13, thereby driving the positioning ring 14 and the screening cylinder 4 to move upward as a whole. When the shaking groove 38 rotates to below the shaking block 39, the sliding plate 13 and the screening cylinder 4 are rapidly moved downward under the action of gravity, thereby causing the metal powder in the screening cylinder 4 to be shaken. At this time, the powder in the conveying groove 6 is accelerated to downwardly screen, and the particles blocked in the screen holes of the screening cylinder 4 are collected into the recovery groove 7 through the shaking of the screening cylinder 4 when the particles rotate to the upper end position, thereby avoiding the relatively large metal powder from falling into the original blocked screening cylinder 4 again to affect the screening efficiency and cause repeated blocking.

[0039] It is worth noting that: the inner diameter of the screen hole on different screen drums 4 is different, the screen hole in the screen drum 4 close to the end of the feed hopper 18 is smaller, the inner diameter of the screen hole of the screen drum 4 close to the threaded cover plate 42 side gradually increases, so that in the process of conveying by the first conveying screw 8, the small particle powder can be screened by the nearest screen drum 4 first, and then gradually output the large particles, each group of screen drums 4 corresponds to a group of output slots 5, which can realize the purpose of graded output, and the final large particle impurities will be output from the other end of the conveying groove 6 into the plug-in pipe 40, and then output through the output hole 41 into the outermost output slot 5 for storage and output.

[0040] In the process of lifting and shaking the shaking pipe 2 and the screen drum 4, the first worm gear 25 can roll on the worm 27 and keep meshing transmission state, the worm 27 can always drive the first worm 27 to rotate with the first rotating shaft 23, the sliding plate 13 always blocks the sliding groove 12 in the process of sliding in the sliding groove 12, to avoid the powder entering the sliding groove 12, and at the same time, the different particle powders are separated by the partition frame 11 and the partition plate 10, the first rotating shaft 23 drives the first conveying screw 8 to rotate constantly, and the powder input from one side of the feed hopper 18 is constantly pushed to the other end position for output, the bottom end of the conveying groove 6 is large, which can ensure that the metal powder is in full contact with the screen hole in the conveying process, realizing the function of separation, the first gear 31 drives the second gear 32 to rotate, the second gear 32 drives the inner tooth ring 30 to rotate, and the inner tooth ring 30 drives the mounting ring 20 to make the multiple screen drums 4 rotate synchronously, at this time, the rotating direction of the screen drum 4 is opposite to that of the first conveying screw 8, which improves the efficiency of the first conveying screw 8 in pushing and conveying the metal powder, the screen drum 4 rotates and screens, and the position of the screen hole is constantly switched, so that multiple screen holes can be fully switched and used, and the clogged screen hole is rotated to the upper position and the particles in the screen hole are discharged into the recovery groove 7 with vibration.

[0041] The inner tooth ring 30 drives the third gear 35 to drive the rotating rod 33 to rotate, and in the process of rotating the second conveying screw 34 driven by the rotating rod 33, the clogging material in the recovery groove 7 can be pushed to the other end position synchronously, and when the clogging material reaches the recovery port 36, it can fall into the adjacent screen drum 4 again, which can effectively avoid the clogging material from falling into the original screen drum 4 again, and the screen hole of the adjacent screen drum 4 is relatively larger than the original clogged screen hole, so that the clogging material can be better screened out from the screen hole at this position, improving the screening efficiency, and the connecting frame 19 can always slide along the outer wall of the feed hopper 18 in the process of lifting and shaking the shaking pipe 2, keeping the communication and conveying state with the feed hopper 18.

[0042] In disassembly, the screen cylinder 4 with proper screen hole inner diameter can be selected according to the required particle classification, and is sequentially sleeved to the outer wall of the shaking tube 2 and is fixed by clamping, the connection is located in the positioning ring 14, the sealing of the connection position is ensured, the plug-in pipe 40 is connected at the other end and is screwed into the threaded cover plate 42, the end of the plug-in pipe 40 is pressed against by the threaded cover plate 42, and the positioning and installation operation of the whole screen cylinder 4 is completed, in the process of shaking of the screen cylinder 4, the thread changes and the plug-in pipe 40 shakes, and the sealing operation can also be performed by the sliding plate 13, and the normal operation of the rotating shaking and classification operation is not affected.

[0043] It should be noted that the relational terms herein, such as first and second, are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A metal powder classifying apparatus characterized by comprising: Include: The body (1), the body (1) is equipped with the shaking pipe (2); Also includes: Classification mechanism (3), the classification mechanism (3) includes multiple groups of sieve drums (4) movably sleeved with the outer wall of the shaking pipe (2), the body (1) is equipped with multiple groups of output grooves (5), the shaking pipe (2) is provided with a conveying groove (6) capable of being communicated with the output groove (5), the upper side of the shaking pipe (2) is provided with a recovery groove (7), the first conveying screw (8) is rotatably connected in the conveying groove (6), the body (1) is equipped with a driving member (9) for driving the sieve drum (4) to intermittently lift and shake, and the first conveying screw (8) and the sieve drum (4) are continuously rotated, and the rotation direction of the first conveying screw (8) is opposite to the rotation direction of the sieve drum (4), the classification mechanism (3) can input metal powder into the conveying groove (6), convey by the rotation of the first conveying screw (8), so that the sieve drum (4) classifies and screens the metal powder, outputs from the corresponding output groove (5), controls the driving member (9) to drive the sieve drum (4) to rotate in reverse, switches the position of the screen hole, rotates the blocked screen hole to the upper position, shakes the screen hole inside the powder into the recovery groove (7) for recovery and input into the conveying groove (6) again for screening again.

2. A metal powder sizing apparatus according to claim 1, characterised in that: The classification mechanism (3) further includes multiple groups of partition plates (10) fixedly installed in the body (1), the partition plates (10) are respectively located between adjacent output grooves (5), the upper side of the partition plate (10) is fixedly connected with a partition frame (11), the partition frame (11) is provided with a sliding groove (12), the sliding groove (12) is slidably connected with a sliding plate (13) in the vertical direction, the sliding plate (13) is fixedly connected with a positioning ring (14), the outer wall of the sieve drum (4) is movably sleeved with the inner wall of the positioning ring (14), the body (1) is provided with a mounting member (15) for assembling the sieve drum (4), the body (1) is provided with a conveying member (16) for assisting raw material conveying.

3. A metal powder sizing apparatus according to claim 2, characterised in that: The conveying member (16) includes an end plate (17) fixedly installed at one end of the shaking pipe (2), the body (1) is fixedly connected with a feeding hopper (18), the bottom end outer wall of the feeding hopper (18) is slidably connected with a connecting frame (19) in the vertical direction, one end of the connecting frame (19) is fixedly connected with the side surface of the end plate (17), and the two ends of the connecting frame (19) are respectively connected with the feeding hopper (18) and the shaking pipe (2).

4. A metal powder sizing apparatus according to claim 3, wherein: The mounting piece (15) comprises a mounting ring (20) rotationally connected with the outer wall of the end plate (17), both ends of the screening cylinder (4) are respectively provided with a plug-in block (21) capable of being plugged with adjacent screening cylinders (4), and the inner wall of the mounting ring (20) is provided with a plug-in groove (22) capable of being butted with the plug-in block (21) on the side surface of the adjacent screening cylinder (4), and the connection position of the adjacent screening cylinder (4) is located in the positioning ring (14).

5. A metal powder sizing apparatus according to claim 4, wherein: The driving piece (9) comprises a first rotating shaft (23) coaxially and fixedly installed on the first conveying screw (8), the machine body (1) is rotationally connected with a second rotating shaft (24), the second rotating shaft (24) penetrates through a plurality of the partition plates (10) and is rotationally connected with the partition plates (10), one end of the first rotating shaft (23) is coaxially and fixedly connected with a first worm wheel (25), one end of the second rotating shaft (24) is coaxially and fixedly connected with a second worm wheel (26), the machine body (1) is rotationally connected with a worm (27) in meshing transmission with the first worm wheel (25) and the second worm wheel (26), the first rotating shaft (23) is provided with a control piece for driving the mounting ring (20) to rotate and conveying the powder in the recovery groove (7) at the same time, and the second rotating shaft (24) is provided with a shaking piece for driving the shaking pipe (2) to shake and assisting in outputting the screened powder at the same time.

6. A metal powder sizing apparatus according to claim 5, wherein: The control piece comprises an inner gear ring (30) fixedly installed on the mounting ring (20), the first rotating shaft (23) is coaxially and fixedly connected with a first gear (31), the end plate (17) is rotationally connected with a second gear (32) in meshing transmission with the first gear (31) and the inner gear ring (30), the end plate (17) is rotationally connected with a plurality of rotating rods (33), the outer wall of the rotating rod (33) is fixedly connected with a second conveying screw (34) rotationally abutting the inner wall of the recovery groove (7), the rotating rod (33) is coaxially and fixedly connected with a third gear (35) in meshing transmission with the inner gear ring (30), a plurality of recovery openings (36) for connecting the recovery groove (7) and the conveying groove (6) are formed in the shaking pipe (2), and the recovery openings (36) are located at the connection positions of the adjacent screening cylinders (4).

7. A metal powder sizing apparatus according to claim 6, characterised in that: The shaking piece comprises a plurality of shaking discs (37) rotationally connected with the inner walls of the partition plates (10) respectively, a plurality of shaking grooves (38) are uniformly formed in the shaking disc (37), the bottom end of the sliding plate (13) is fixedly connected with a shaking block (39), and a plurality of the shaking discs (37) are coaxially and fixedly installed on the second rotating shaft (24) respectively.

8. A metal powder sizing apparatus according to claim 4, wherein: The mounting piece (15) further comprises a spigot pipe (40) capable of being spigoted with the spigot block (21) at one end of the screening cylinder (4), a plurality of sets of output holes (41) are uniformly arranged on the spigot pipe (40), a threaded cover plate (42) is threadedly connected to one set of the positioning rings (14) away from the feeding hopper (18), and one end of the spigot pipe (40) is capable of being rotationally attached to the inner wall of the threaded cover plate (42).

9. A metal powder sizing apparatus according to claim 5, wherein: The shaking piece further comprises a plurality of sets of driving leaves (43) coaxially and fixedly installed on the second rotating shaft (24), and the plurality of sets of driving leaves (43) are respectively located in different output grooves (5).

10. A metal powder sizing apparatus according to claim 5, wherein: The driving piece (9) further comprises a driving motor (44) fixedly installed in the machine body (1), and an output end of the driving motor (44) is coaxially and fixedly connected with one end of the worm (27).

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