A powder screening equipment

Abstract

The present application relates to a powder screening device, which comprises a screening frame and a bottom frame, wherein a first screen is detachably connected to the screening frame, and a second screen is embedded in the bottom frame, the first screen and the second screen are both made of hard material, the first screen and the second screen are abutted, the filter holes of the first screen itself are first filter holes and a plurality of first filter holes are evenly distributed, the filter holes of the second screen itself are second filter holes and a plurality of second filter holes are evenly distributed, the screening frame is located above the bottom frame, the bottom frame is rotatably connected to the screening frame, and the rotation axis coincides with the vertical center line of the screening frame; along the rotation direction of the bottom frame, the shortest distance between the edges of adjacent second filter holes is not less than the aperture of the first filter hole, the first filter hole and the second filter hole are set in the same number, and their projections in the vertical direction are directly opposite to each other; a locking component is provided between the screening frame and the bottom frame, and the locking component is used to fix the bottom frame on the screening frame. The present application has the effect of improving the convenience of adjusting the screening particle size.

Description

Technical Field

[0001] The present application relates to the technical field of screening equipment, and in particular to a powder screening equipment. Background Art

[0002] There are many types of screening machines currently, including linear vibrating screens, drum screens and rotary vibrating screens.

[0003] The rotary vibrating screen is a high-precision fine powder screening machine with low noise and high efficiency. It is suitable for screening and filtering of materials such as particles, powders, and mucus. The rotary vibrating screen includes a base, a bottom frame and a screening frame are arranged on the base, the screening frame is located on the bottom frame, a screen is arranged between the screening frame and the bottom frame, a supporting spring and a vibration motor are arranged between the base and the bottom frame, the supporting spring is used to support the bottom frame on the base, the vibration motor is used to vibrate the bottom frame, and the vibration motor itself has a spiral angle adjustment and an amplitude adjustment disk, a screen discharge port is arranged on the circumferential side wall of the screening frame, and a screen discharge port is arranged on the circumferential side wall of the bottom frame.

[0004] The powder is put into the screening frame and falls on the screen. Due to the presence of the vibration motor, the material on the screen is screened and moves toward the circumferential side wall of the screening frame. Finally, the powder remaining on the screen is discharged from the screen discharge port, and the powder under the screen is discharged from the screen discharge port. A hoop is arranged at the junction of the bottom frame and the outer wall of the screening frame, and the bottom frame, the screening frame and the screen are locked by the hoop.

[0005] In actual operation, the inventor found that when different particle sizes need to be screened according to the different powder particle sizes, it is necessary to replace the screens with different screening degrees. At this time, the hoop must be unlocked and then the entire screening frame must be removed before the screen can be replaced. This has the defect of inconvenient adjustment of the screening particle size. Summary of the invention

[0006] In order to improve the convenience of adjusting the screening particle size, the present application provides a powder screening device.

[0007] The powder screening equipment provided in this application adopts the following technical solution:

[0008] A powder screening device comprises a base and a supporting spring, one end of the supporting spring is fixed on the top of the base, and also comprises a screening frame and a bottom frame, the screening frame is detachably connected with a first screen, and a second screen is embedded in the bottom frame, the first screen and the second screen are both made of hard material, the first screen and the second screen are abutted, the filter holes of the first screen itself are first filter holes and there are multiple first filter holes distributed at equal intervals, the filter holes of the second screen itself are second filter holes and there are multiple second filter holes distributed at equal intervals, the screening frame is located above the bottom frame, the bottom frame is rotatably connected to the screening frame, the rotating shaft coincides with the vertical center line of the screening frame, and the end of the supporting spring away from the base is slidably connected to the bottom frame; along the rotation direction of the bottom frame, the shortest distance between the edges of adjacent second filter holes is not less than the aperture of the first filter hole, the first filter hole and the second filter hole are set in the same number, and the projections in the vertical direction are directly opposite to each other; a locking component is arranged between the screening frame and the bottom frame, and the locking component is used to fix the bottom frame on the screening frame.

[0009] By adopting the above technical solution, when it is necessary to adjust the particle size of the screened powder, the restriction on the bottom frame is directly unlocked through the locking assembly, and the bottom frame is rotated relative to the screening frame, so that the first filter hole and the second filter hole are relatively misaligned. Since the shortest distance between the edges of adjacent second filter holes is not less than the aperture of the first filter hole, when the bottom frame is rotated, the overlapping part of the first filter hole and the second filter hole will definitely become smaller, thereby achieving the adjustment of the particle size of the powder screening. This adjustment method does not require the removal of the screening frame or the replacement of the first screen or the second screen. The worker only needs to rotate the bottom frame. The operation is simple and convenient, which achieves the effect of improving the convenience of adjusting the screening particle size.

[0010] Optionally, a first rotating shaft is vertically fixed on the outer wall of the screening frame, and a second rotating shaft is vertically fixed on the outer wall of the bottom frame. The first rotating shaft and the second rotating shaft are rotatably connected, and the rotating shaft coincides with a center line of the first rotating shaft.

[0011] By adopting the above technical solution, the existence of the first rotating shaft and the second rotating shaft allows the screening frame to rotate with the first rotating shaft as the rotating axis to a state away from the top of the bottom frame. At this time, the first screen and the second screen can be replaced without taking down the screening frame, thereby improving the convenience of replacing the first screen and the second screen.

[0012] Optionally, a first connecting rod is fixed between the screening frame and the first rotating shaft, and a second connecting rod is fixed between the bottom frame and the second rotating shaft; the locking assembly includes a positioning ring, a toggle rod, a positioning rod and a reset rope, the outer wall of the positioning ring is connected to the outer wall of one end of the toggle rod, the positioning ring is sleeved on the top of the first rotating shaft, the toggle rod is rotatably connected to the first connecting rod, the rotating shaft is horizontally arranged along a direction perpendicular to the first connecting rod, the other end of the toggle rod is abutted against the end of the positioning rod, the positioning rod is slidably connected to the second connecting rod, and the sliding direction is along the direction close to or away from the outer wall of the bottom frame. The reset rope is fixedly connected to the second connecting rod, the reset rope spans the end of the toggle rod close to the bottom frame and is connected with the end face of the toggle rod by clamping, the reset rope is elastic, a positioning hole is provided on the outer wall of the bottom frame, and a plurality of positioning holes are provided equidistantly along the outer wall of the bottom frame; the end of the toggle rod is inserted into the positioning hole, and there is a distance between the end of the toggle rod close to the second connecting rod and the second rotating shaft, and the reset rope is in a stretched state; the rotating shaft between the toggle rod and the first connecting rod is an arc-shaped round rod, and the center of the arc coincides with the vertical center line of the first rotating shaft.

[0013] By adopting the above technical solution, when the positioning ring is put on the first rotating shaft, the toggle lever rotates, and the end of the toggle lever close to the positioning rod pushes the positioning rod toward the positioning hole. At this time, the reset rope is continuously stretched until the end of the positioning rod is inserted into the positioning hole. At the same time, the positioning ring is put on the first rotating shaft, completing the limiting of the bottom frame. When it is necessary to release the limiting of the bottom frame, it is only necessary to remove the positioning ring from the first rotating shaft, and the elastic force of the reset rope itself will pull the positioning rod out of the positioning hole.

[0014] Optionally, the positioning ring is made of a hard material, the positioning ring is rotatably connected to the toggle rod, the rotating shaft is horizontally arranged, and a limiting rod is fixed on the inner wall of the positioning ring; when the positioning ring is sleeved on the outer wall of the first rotating shaft, the end of the limiting rod close to the first rotating shaft abuts against the outer wall of the first rotating shaft.

[0015] By adopting the above technical solution, since the screening frame and the bottom frame are both in a vibrating state during use, the positioning ring is limited to a hard material and is equipped with a limiting rod, which can avoid the positioning ring from shaking relative to the first rotating shaft and ensure that the positioning rod is always stably inserted in the positioning hole when limiting the bottom frame.

[0016] Optionally, a sliding groove is provided on the top of the second connecting rod, the sliding groove is provided in a direction close to or away from the bottom frame, and the outer wall of the second connecting rod is opened through at one end close to the bottom frame; an annular groove is provided on the outer wall of the bottom frame, the annular groove is provided horizontally along the outer wall of the bottom frame, the positioning hole is located in the annular groove, and the second connecting rod is inserted into the annular groove at one end close to the bottom frame.

[0017] By adopting the above technical solution, the opening of the slide groove ensures that the positioning rod can stably move toward or away from the positioning hole.

[0018] Optionally, a first groove is provided on the end face of the screening frame facing the bottom frame. The first groove is provided along the end face with the center line of the screening frame as the axis and penetrates the inner wall of the screening frame. The first screen is embedded in the first groove. The bottom surface of the first screen is flush with the bottom surface of the screening frame. The outer wall of the screening frame is fixed with a disc bolt, which passes through the screening frame and is threadedly connected to the first screen.

[0019] By adopting the above technical solution, the opening of the first groove provides space for placing the first screen, and the first screen is quickly fixed with the disc bolts, which facilitates the rapid replacement of the first screen.

[0020] Optionally, a second groove is provided at the top of the bottom frame. The second groove is provided around the end surface with the center line of the bottom frame as the axis and penetrates the inner wall of the bottom frame. The second screen is embedded in the second groove. The top surface of the second screen is flush with the top surface of the bottom frame. A sealing ring is provided between the second screen and the second groove, and the sealing ring is fixedly connected to the groove wall of the second groove.

[0021] By adopting the above technical solution, since the second screen is carried by the bottom frame, the second groove only needs to provide a storage space for the second screen, and while cooperating with the sealing ring to enhance the sealing performance, it can also have a friction limit effect on the second screen.

[0022] Optionally, a support rod is vertically arranged in the bottom frame, the center line of the support rod coincides with the center line of the bottom frame, the bottom end of the support rod is fixedly connected to the inner wall of the bottom frame, and the top end abuts against the second screen.

[0023] By adopting the above technical solution, the first screen and the second screen are both made of hard material, thereby ensuring that the first screen and the second screen are always in abutment state. However, when the area of ​​the first screen and the second screen is too large, the centers of the first screen and the second screen will fall, and the vibrating use environment will affect the abutment state of the first screen and the second screen. Therefore, the presence of the support rod supports the center of the second screen and resists the tendency of the center of the second screen to fall.

[0024] Optionally, the support rod includes a top rod and a bottom rod, the top rod and the bottom rod are threadedly connected, the top rod is located above the bottom rod, the bottom rod is fixedly connected to the bottom frame, and the end of the top rod abuts against the second screen.

[0025] By adopting the above technical solution, the vertical height of the entire support rod can be adjusted by rotating the top rod, ensuring that the top end of the top rod is in a tight contact with the second screen, thereby resisting the downward tendency of the second screen.

[0026] Optionally, an oversize material discharge port is provided on the outer wall of the screening frame, and an undersize material discharge port is provided on the outer wall of the bottom frame. Magnetic rods are fixed to the inner walls of the oversize material discharge port and the undersize material discharge port, and the magnetic rods are used to adsorb ferromagnetic substances.

[0027] By adopting the above technical solution, ferromagnetic materials, mainly strong magnetic materials such as iron and nickel, can be attracted by magnets, thereby removing such impurities in the powder.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The first screen and the second screen are in contact with each other, and the upper bottom frame can rotate relative to the screening frame to achieve the misalignment of the first filter hole and the second filter hole, so that the particle size of the material screening can be adjusted without disassembling the screening frame;

[0030] 2. The setting of the locking component realizes the limiting and fixing of the bottom frame, ensuring the synchronous vibration of the bottom frame and the screening frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0032] Figure 2 This is an exploded view of the structure of the slider.

[0033] Figure 3 is a vertical cross-sectional view of an embodiment of the present application;

[0034] Figure 4 yes Figure 3 Enlarged view of part A.

[0035] In the figure, 1, base; 11, support spring; 2, bottom frame; 21, second screen; 22, second filter hole; 23, second rotating shaft; 24, second connecting rod; 25, positioning hole; 26, ring groove; 27, second groove; 28, sealing ring; 3, screening frame; 31, first screen; 32, first filter hole; 33, first rotating shaft; 34, first connecting rod; 35, first groove; 36, disc bolt; 4, locking assembly; 41, positioning ring; 411, limit rod; 42, toggle rod; 43, positioning rod; 431, embedded groove; 44, reset rope; 5, slide groove; 6, support rod; 61, top rod; 62, bottom rod; 7, magnetic rod; 8, vibration motor; 9, slider; 91, slide rail. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The embodiment of the present application discloses a powder screening device.

[0038] refer to Figure 1 and Figure 2A powder screening device includes a base 1, a bottom frame 2 and a screening frame 3. A support spring 11 and a vibration motor 8 are arranged between the base 1 and the bottom frame 2. The vibration motor 8 is fixed inside the base 1 to provide vibration for the bottom frame 2. One end of the support spring 11 is fixedly connected to the top of the base 1, and the other end is slidably connected to the bottom frame 2. The bottom frame 2 and the support spring 11 cannot be separated in the vertical direction. The screening frame 3 is located above the bottom frame 2. The bottom frame 2 is rotatably connected to the screening frame 3, and the rotation axis coincides with the vertical center line of the bottom frame 2.

[0039] refer to Figure 2 and Figure 3 A second sieve 21 is provided on the bottom frame 2, and the second sieve 21 itself has a second filter hole 22. A first sieve 31 is provided on the screening frame 3, and the first sieve 31 itself has a first filter hole 32. The first sieve 31 and the second sieve 21 are abutted. When it is necessary to adjust the particle size of the powder screening, the first filter hole 32 and the second filter hole 22 are misaligned by rotating the bottom frame 2, thereby changing the channel through which the powder can pass, thereby achieving the effect of improving the convenience of adjusting the screening particle size.

[0040] The sliding connection between the support spring 11 and the bottom frame 2 can be specifically achieved by fixing a slider 9 on the top of the support spring 11, and opening a slide rail 91 on the bottom frame 2. The slide rail 91 is circular and the center of the circle is the center of the bottom surface of the bottom frame 2. The slider 9 is slidingly connected to the slide rail 91, which ensures that the bottom frame 2 and the support spring 11 are slidingly connected, and the bottom frame 2 and the support spring 11 cannot be separated in the vertical direction.

[0041] refer to Figure 3 A support rod 6 is provided in the bottom frame 2, and the support rod 6 is vertically arranged, and the center line of the support rod 6 coincides with the center line of the bottom frame 2. The support rod 6 includes a bottom rod 62 and a top rod 61, one end of the bottom rod 62 is fixedly connected to the inner wall of the bottom frame 2, and the other end is threadedly connected to one end of the top rod 61, and the end of the top rod 61 away from the bottom rod 62 abuts against the second screen 21.

[0042] refer to Figure 3 and Figure 4 A second groove 27 is provided on the end surface of the bottom frame 2 close to the screening frame 3. The second groove 27 is provided along the inner wall of the bottom frame 2 in a circle, and the second groove 27 penetrates the inner wall of the bottom frame 2. The second screen 21 is mounted on the second groove 27, and the top surface of the second screen 21 is flush with the top surface of the bottom frame 2. A sealing ring 28 is provided on the bottom frame 2, and the sealing ring 28 is fixed on the groove wall of the second groove 27, and the sealing ring 28 is located between the second groove 27 and the second screen 21.

[0043] refer to Figure 3 and Figure 4A first groove 35 is provided on the end surface of the screening frame 3 close to the bottom frame 2. The first groove 35 is provided along the inner wall of the screening frame 3 for a circle and penetrates the inner wall of the screening frame 3. The first screen 31 is embedded in the first groove 35. The bottom surface of the first screen 31 is flush with the bottom end surface of the screening frame 3. A first rotating shaft 33, a first connecting rod 34 and a disc bolt 36 are provided on the screening frame 3. The first connecting rod 34 is horizontally arranged and one end is fixedly connected to the circumferential outer wall of the screening frame 3, and the other end is fixedly connected to the first rotating shaft 33. The first rotating shaft 33 is vertically arranged. The disc bolt 36 penetrates the screening frame 3 and is threadedly connected to the first screen 31.

[0044] refer to Figure 2 and Figure 4 The second rotating shaft 23 and the second connecting rod 24 are arranged on the outer wall of the bottom frame 2. The second connecting rod 24 is arranged horizontally. The outer wall of the bottom frame 2 is provided with an annular groove 26 and a positioning hole 25. There are multiple positioning holes 25. The annular groove 26 is arranged horizontally along the outer wall of the bottom frame 2. The positioning holes 25 are located at the bottom of the annular groove 26. Adjacent positioning holes 25 are arranged at intervals. The second rotating shaft 23 is arranged vertically. One end of the second connecting rod 24 is located in the annular groove 26, and the other end is fixedly connected to the second rotating shaft 23. The vertical center lines of the first rotating shaft 33 and the second rotating shaft 23 are colinear, and the first rotating shaft 33 and the second rotating shaft 23 are rotatably connected. A locking assembly 4 is arranged between the bottom frame 2 and the screening frame 3. The locking assembly 4 is used to limit and fix the bottom frame 2 and the screening frame 3.

[0045] refer to Figure 3 and Figure 4The locking assembly 4 includes a positioning ring 41, a reset rope 44, a toggle rod 42 and a positioning rod 43. A slide groove 5 is provided on the top of the second connecting rod 24. The slide groove 5 is provided in a direction close to or away from the bottom frame 2. The slide groove 5 penetrates the end of the second connecting rod 24 into the annular groove 26. The positioning rod 43 and the reset rope 44 are both located in the slide groove 5. The positioning rod 43 slides along the length direction of the slide groove 5. The reset rope 44 is located at one end of the slide groove 5 close to the bottom frame 2. Both ends of the reset rope 44 are fixedly connected to two opposite groove walls of the slide groove 5. A card embedding groove 431 is provided at the end of the positioning rod 43. The reset rope 44 spans the end of the positioning rod 43 and is card embedded in the card embedding groove 4 31, the reset rope 44 is elastic, the toggle rod 42 is vertically arranged, and one end is located in the slide groove 5 and abuts against the end of the positioning rod 43, the toggle rod 42 is close to the outer wall of the first connecting rod 34, the toggle rod 42 is rotatably connected with the first connecting rod 34, the rotating shaft is horizontally arranged, and the rotating shaft is an arc-shaped cylindrical shape, and the center of the circle coincides with the vertical center line of the first rotating shaft 33, the positioning ring 41 is rotatably connected with the end of the toggle rod 42 away from the positioning rod 43, the rotating shaft is horizontally arranged, and a limiting rod 411 is fixed on the inner wall of the positioning ring 41. After the positioning ring 41 is sleeved on the first rotating shaft 33, the end of the limiting rod 411 abuts against the outer wall of the first rotating shaft 33. When the locking assembly 4 locks the bottom frame 2 and the screening frame 3, the positioning ring 41 is sleeved on the outer wall of the first rotating shaft 33, one end of the limiting rod 411 abuts against the outer wall of the first rotating shaft 33, the end of the toggle rod 42 away from the positioning ring 41 abuts against the end of the positioning rod 43, and a distance is left between the end of the toggle rod 42 close to the positioning rod 43 and the first rotating shaft 33, and the end of the positioning rod 43 away from the toggle rod 42 is inserted into the corresponding positioning hole 25, and the reset rope 44 is in a stretched state. The positioning ring 41 is made of a hard material, such as PVC.

[0046] refer to Figure 3 The first screen 31 and the second screen 21 are both made of hard material, and the first filter hole 32 and the second filter hole 22 are provided in multiple and the same number, and the projections in the vertical direction are distributed opposite to each other. Along the rotation direction of the bottom frame 2, the shortest distance between the edges of adjacent second filter holes 22 is not less than the aperture of the first filter hole 32, so as to better control the overlapping part of the first filter hole 32 and the second filter hole 22.

[0047] refer to Figure 3 A discharge port for oversize is arranged on the outer wall of the screening frame 3, a discharge port for undersize is arranged on the outer wall of the bottom frame 2, and magnetic rods 7 are fixed on the inner walls of the discharge port for oversize and undersize, and the magnetic rods 7 have magnetic properties and can absorb metal impurities such as iron and nickel in the powder.

[0048] The implementation principle of a powder screening device in the embodiment of the present application is as follows: when it is necessary to adjust the particle size of the powder screening, remove the positioning ring 41 from the first rotating shaft 33, then slide the positioning rod 43 out of the positioning hole 25, and rotate the bottom frame 2 relative to the screening frame 3, thereby adjusting the overlapping part of the first filter hole 32 and the second filter hole 22 to achieve the effect of adjusting the screening particle size. After the adjustment is completed, the positioning ring 41 is re-circled on the outer wall of the first rotating shaft 33 to limit the bottom frame 2. When it is necessary to replace the first screen 31 and the second screen 21, the screening frame 3 can be rotated with the second rotating shaft 23 as the rotating axis. At this time, the first screen 31 and the second screen 21 are both exposed, which is convenient for workers to quickly replace.

[0049] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A powder screening device, comprising a base (1) and a support spring (11), wherein one end of the support spring (11) is fixed to the top of the base (1), characterized in that: The invention also comprises a screening frame (3) and a bottom frame (2); the screening frame (3) is detachably connected with a first screen (31); the bottom frame (2) is embedded with a second screen (21); the first screen (31) and the second screen (21) are both made of hard material; the first screen (31) and the second screen (21) are in contact with each other; the filter holes of the first screen (31) are first filter holes (32) and a plurality of the first filter holes (32) are evenly spaced; the filter holes of the second screen (21) are second filter holes (22) and a plurality of the second filter holes (22) are evenly spaced; the screening frame (3) is located above the bottom frame (2); the bottom frame (2) is provided with a plurality of filter holes (22) and a plurality of filter holes (22) are evenly spaced; The frame (2) is rotatably connected to the screening frame (3), the rotation axis coincides with the vertical center line of the screening frame (3), and the end of the support spring (11) away from the base (1) is slidably connected to the bottom frame (2); along the rotation direction of the bottom frame (2), the shortest distance between the edges of adjacent second filter holes (22) is not less than the aperture of the first filter hole (32), the first filter hole (32) and the second filter hole (22) are arranged in the same number, and their projections in the vertical direction are arranged opposite to each other; a locking component (4) is arranged between the screening frame (3) and the bottom frame (2), and the locking component (4) is used to fix the bottom frame (2) on the screening frame (3); A first rotating shaft (33) is vertically fixed on the outer wall of the screening frame (3), and a second rotating shaft (23) is vertically fixed on the outer wall of the bottom frame (2). The first rotating shaft (33) and the second rotating shaft (23) are rotatably connected, and the rotating shaft coincides with the center line of the first rotating shaft (33); A first connecting rod (34) is fixed between the screening frame (3) and the first rotating shaft (33), a second connecting rod (24) is arranged between the bottom frame (2) and the second rotating shaft (23), and one end of the second connecting rod (24) is fixedly connected to the second rotating shaft (23); the locking assembly (4) comprises a positioning ring (41), a toggle rod (42), a positioning rod (43) and a reset rope (44); the outer wall of the positioning ring (41) is connected to the outer wall of one end of the toggle rod (42); the positioning ring (41) is sleeved on the top of the first rotating shaft (33); the toggle rod (42) is rotatably connected to the first connecting rod (34); the rotating shaft is horizontally arranged in a direction perpendicular to the first connecting rod (34); the other end of the toggle rod (42) is in contact with the end of the positioning rod (43); the positioning rod (43) is slidably connected to the second connecting rod (24), and the sliding direction is along the approaching or the moving direction. In the direction away from the outer wall of the bottom frame (2), the reset rope (44) is fixedly connected to the second connecting rod (24), the reset rope (44) spans the end of the toggle rod (42) close to the bottom frame (2) and is connected with the end face of the toggle rod (42) by clamping, the reset rope (44) is elastic, a positioning hole (25) is provided on the outer wall of the bottom frame (2), and a plurality of positioning holes (25) are provided along the outer wall of the bottom frame (2) at equal intervals; the end of the positioning rod (43) away from the toggle rod (42) is inserted into the corresponding positioning hole (25), there is a distance between the end of the toggle rod (42) close to the second connecting rod (24) and the second rotating shaft (23), and the reset rope (44) is in a stretched state; the rotating shaft between the toggle rod (42) and the first connecting rod (34) is an arc-shaped round rod, and the center of the arc coincides with the vertical center line of the first rotating shaft (33).

2. A powder screening device according to claim 1, characterized in that: The positioning ring (41) is a positioning ring (41) made of a hard material. The positioning ring (41) is rotatably connected to the toggle rod (42). The rotating shaft is horizontally arranged. A limiting rod (411) is fixed on the inner wall of the positioning ring (41). When the positioning ring (41) is sleeved on the outer wall of the first rotating shaft (33), the end of the limiting rod (411) close to the first rotating shaft (33) abuts against the outer wall of the first rotating shaft (33).

3. A powder screening device according to claim 1, characterized in that: A slide groove (5) is provided on the top of the second connecting rod (24), the slide groove (5) is provided in a direction close to or away from the bottom frame (2), and the outer wall of the second connecting rod (24) is opened at one end close to the bottom frame (2); an annular groove (26) is provided on the outer wall of the bottom frame (2), the annular groove (26) is horizontally provided along the outer wall of the bottom frame (2), the positioning hole (25) is located in the annular groove (26), and the end of the second connecting rod (24) close to the bottom frame (2) is inserted into the annular groove (26).

4. A powder screening device according to claim 1, characterized in that: A first groove (35) is provided on the end surface of the screening frame (3) facing the bottom frame (2). The first groove (35) is provided around the end surface with the center line of the screening frame (3) as the axis and penetrates the inner wall of the screening frame (3). The first screen (31) is embedded in the first groove (35). The bottom surface of the first screen (31) is flush with the bottom surface of the screening frame (3). A disc bolt (36) is fixed to the outer wall of the screening frame (3). The disc bolt (36) passes through the screening frame (3) and is threadedly connected to the first screen (31).

5. A powder screening device according to claim 4, characterized in that: A second groove (27) is provided at the top of the bottom frame (2). The second groove (27) is provided around the end surface thereof with the center line of the bottom frame (2) as the axis and penetrates the inner wall of the bottom frame (2). The second screen (21) is embedded in the second groove (27). The top surface of the second screen (21) is flush with the top surface of the bottom frame (2). A sealing ring (28) is provided between the second screen (21) and the second groove (27). The sealing ring (28) is fixedly connected to the groove wall of the second groove (27).

6. The powder screening device according to claim 1, characterized in that: A support rod (6) is vertically arranged in the bottom frame (2), the center line of the support rod (6) coincides with the center line of the bottom frame (2), the bottom end of the support rod (6) is fixedly connected to the inner wall of the bottom frame (2), and the top end is in contact with the second screen (21).

7. A powder screening device according to claim 6, characterized in that: The support rod (6) comprises a top rod (61) and a bottom rod (62), the top rod (61) and the bottom rod (62) are threadedly connected, the top rod (61) is located above the bottom rod (62), the bottom rod (62) is fixedly connected to the bottom frame (2), and the end of the top rod (61) abuts against the second screen (21).

8. The powder screening device according to claim 1, characterized in that: The outer wall of the screening frame (3) is provided with an oversize material discharge port, the outer wall of the bottom frame (2) is provided with an undersize material discharge port, and magnetic rods (7) are fixed to the inner walls of the oversize material discharge port and the undersize material discharge port, and the magnetic rods (7) are used to absorb ferromagnetic substances.

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