Magnetic powder vibrating screen with multi-layer screen

Abstract

The utility model relates to the field of vibrating screening machine, especially in a kind of magnetic powder vibrating screening machine with multilayer screen, including screening box, the screening box is provided with screening cylinder, and screening mechanism is jointly cooperated between screening box and screening cylinder;The utility model is through the screen of multiple inclined structures of multistage arrangement in screening cylinder, guides magnetic powder to form serpentine moving track, substantially prolongs the screening path and contact frequency of magnetic powder in screening cylinder, reduces the situation that fine powder is entrained, coarse powder is missed, slows down the falling speed of magnetic powder simultaneously, avoids the problem of insufficient screening caused by too fast flow rate, makes finished product magnetic powder particle size distribution more uniform, significantly improves screening quality.

Description

Technical Field

[0001] This utility model relates to the field of vibrating screening machines, and in particular to a magnetic powder vibrating screening machine with multiple layers of screens. Background Technology

[0002] With the rapid development of electronic information technology, the performance requirements for magnetic cores are becoming increasingly stringent. Magnetic powder is a key material in the manufacture of magnetic cores, and its quality directly affects the performance of the core. However, raw magnetic powder obtained from nature or pre-processed magnetic powder often fails to meet the stringent requirements of these high-end applications regarding particle size distribution, purity, and magnetic properties. Magnetic powder of different particle sizes exhibits significant differences in performance within the product. Overly coarse magnetic powder may lead to uneven product performance and reduced precision, while overly fine magnetic powder may cause agglomeration, similarly affecting product quality. Therefore, accurately separating the required magnetic powder from raw or pre-processed magnetic powder to ensure high consistency and reliability of the final magnetic powder used is crucial for producing high-performance magnetic cores.

[0003] In existing technologies, magnetic powder is typically screened using a magnetic powder screening machine. This machine uses a vibrating motor as its power source, driving the entire machine to generate a strong vibration force. This causes the screens within the machine to vibrate at high frequency, achieving the effect of screening magnetic powder of different particle sizes. However, the screens in these machines are usually fixed and vibrate along with the rest of the equipment. After the magnetic powder is input, it falls with gravity and accumulates on the screen. Because the screen vibration requires a certain amount of time to separate the magnetic powder, the powder is not separated immediately. As more magnetic powder is input, the unseparated powder on the screen is compressed by the pressure of the falling powder. Simultaneously, newly input powder is hindered by existing powder on the screen, causing the powder to gradually agglomerate due to interaction forces during vibration, thus affecting the separation efficiency.

[0004] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing screening equipment for magnetic particle sieving. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a magnetic powder vibrating screen with multiple layers of screens, including a screening box. A screening cylinder is installed inside the screening box, and a screening mechanism is provided between the screening box and the screening cylinder. The screening mechanism includes a drive shaft axially extending through the screening cylinder, and several screens are spaced apart along the axial direction of the drive shaft. The screens are inclined and confined within the screening cylinder, and several screen holes are uniformly formed on the screens. An eccentric block is fitted after the drive shaft extends out of the screening cylinder, and a drive end is installed between the drive shaft and the screening box.

[0006] Preferably, the aperture of the screens on the plurality of screens is gradually reduced from top to bottom.

[0007] Preferably, the inclination angles of any two adjacent screens inside the screening cylinder are set opposite.

[0008] Preferably, a feed cylinder is installed on the screening cylinder corresponding to its feed inlet, and an auger blade is sleeved on the drive shaft to abut against the inside of the feed cylinder.

[0009] Preferably, a limiting sleeve is also sleeved on the drive shaft between the drive end and the eccentric block. The drive shaft is connected to the drive end through the limiting sleeve. A guide groove is formed on the drive shaft, and a driven guide rod that slides and is inserted into the guide groove is connected to the limiting sleeve.

[0010] Preferably, the screening cylinder is provided with discharge outlets corresponding to a plurality of screens.

[0011] Preferably, the bottom of the screening cylinder is provided with a discharge cylinder that extends out of the screening box.

[0012] Preferably, a pusher frame is fitted on the drive shaft, which corresponds to and fits against the bottom wall of the screening cylinder.

[0013] In summary, this application includes at least one of the following beneficial technical effects: I. This utility model guides the magnetic powder to form a serpentine movement trajectory through multiple inclined screens arranged in a multi-level screen cylinder, which greatly extends the screening path and contact frequency of the magnetic powder in the screen cylinder, reduces the situation of fine powder entrainment and coarse powder leakage, and slows down the falling speed of the magnetic powder to avoid the problem of insufficient screening caused by excessive flow rate, so that the particle size distribution of the finished magnetic powder is more uniform and significantly improves the screening quality.

[0014] II. This utility model achieves axial reciprocating sliding and intermittent rotation of the drive shaft through the cooperation of the guide groove and the driven guide rod, so that the screen can synchronously complete the composite action of high-frequency vibration and axial translation, further disrupting the movement rhythm of the magnetic powder, which not only prolongs the effective screening time, but also increases the contact probability between magnetic powder of different particle sizes and the screen, thus greatly improving the overall screening efficiency and separation accuracy.

[0015] Third, this utility model uses the intermittent rotation of the auger blades driven by the driven shaft of the feed cylinder to precisely control the amount of magnetic powder fed into the screening cylinder at one time, effectively preventing excessive accumulation of magnetic powder from clogging the screen and affecting the screening efficiency, thereby ensuring the smooth progress of the screening process. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a structural schematic diagram of the screening box of this utility model.

[0019] Figure 3 This is a schematic diagram of the screening mechanism of this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the screening cylinder of this utility model.

[0021] Figure 5 This is a utility model Figure 4 A magnified view of A in the middle.

[0022] Figure 6 This is a schematic diagram of the feed cylinder of this utility model.

[0023] Figure 7 This is a structural schematic diagram of the push frame of this utility model.

[0024] Figure 8 This is a utility model Figure 7 A magnified view of B in the middle.

[0025] In the diagram, 1 is the screening box; 10 is the screening cylinder; 2 is the screening mechanism; 20 is the drive shaft; 21 is the screen; 22 is the eccentric block; 23 is the floating spring; 24 is the feed cylinder; 240 is the auger blade; 25 is the limit sleeve; 250 is the guide chute; 251 is the driven guide rod; 26 is the discharge port; 27 is the discharge cylinder; and 28 is the push frame. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 To be continued Figure 8 The embodiments of this utility model will be described in detail below.

[0027] This utility model discloses a magnetic powder vibrating screen with multiple layers of screens. Through the cooperation of multiple layers of screens, the consistency and reliability of the magnetic powder particle size after screening can be further improved. During the screening process, it can effectively prevent the accumulation and compression between the magnetic powder that is not completely screened on the screen and the subsequent magnetic powder, which can easily cause the agglomeration of magnetic powder of different particle sizes. This can effectively improve the screening efficiency of the screener.

[0028] Reference Figure 1 and Figure 2 As shown, a magnetic powder vibrating screener with a multi-layer screen 21 includes a screening box 1, a screening cylinder 10 is provided inside the screening box 1, and a screening mechanism 2 is provided between the screening box 1 and the screening cylinder 10 to drive the screening cylinder 10 to vibrate inside the screening box 1 to screen the raw or pre-processed magnetic powder.

[0029] Reference Figures 2 to 4 As shown, this is the screening mechanism 2 used for screening magnetic powder. Specifically, the screening mechanism 2 includes a drive shaft 20 axially passing through a screening cylinder 10. Several screens 21 are spaced apart along the axial direction of the drive shaft 20, with the screens 21 inclined and confined within the screening cylinder 10. Several screen holes are uniformly formed on the screens 21. After the drive shaft 20 passes through the screening cylinder 10, an eccentric block 22 is fitted onto it. A drive end is installed between the drive shaft 20 and the screening box 1, using existing motor drive technology. Several floating springs 23 are also circumferentially arranged on the screening cylinder 10 and connected to the screening box 1. It should be noted that in this embodiment, all the screens 21 are rotated through the drive shaft 20.

[0030] The drive shaft 20 and eccentric block 22 are driven to rotate by the drive end. During the rotation of the eccentric block 22 around the drive shaft 20, its own gravity causes a centrifugal effect, which simultaneously acts on the drive shaft 20, causing the drive shaft 20, screen 21, and screening cylinder 10 to vibrate at high frequency. During vibration, the inclined screen 21 causes the material to move gradually along its inclination direction. Simultaneously, the screen holes on the screen 21 are used to separate coarse and fine materials. Several floating springs 23 extend and deform synchronously with the vibration, and the material to be screened... When the screening cylinder 10 is driven to vibrate and deviate to either side, the floating spring 23 on the deviated side of the screening cylinder 10 is compressed, while the floating spring 23 on the other side of the screening cylinder 10 is stretched. As the screening cylinder 10 vibrates and deviates, the extension and contraction states of the floating springs 23 on both sides also change accordingly. On the one hand, this buffers the vibration impact of the screening cylinder 10 and avoids hard collision with the screening box 1, which would cause component damage. On the other hand, it enhances the vibration amplitude and flexibility of the screening cylinder 10 and improves the material screening efficiency.

[0031] Furthermore, referring to Figures 2 to 5 As shown, in order to improve the screening effect, the aperture of the screen holes on several screens 21 is set to gradually decrease from top to bottom. Through the screen holes of the screens 21 with the aperture decreasing layer by layer, the stratified screening effect of coarse and fine materials is achieved during the vibration of the screens 21.

[0032] Furthermore, referring to Figures 2 to 4As shown, the inclination angles of any two adjacent screens 21 within the screening cylinder 10 are set in opposite directions. Several screens 21 with alternating inclination angles guide the magnetic powder being screened in an approximately serpentine trajectory within the screening cylinder 10. This effectively extends the path length of the magnetic powder within the screening cylinder 10, further increasing the contact frequency between the magnetic powder and the screen surface 21. This allows magnetic powder of different particle sizes to pass fully through the corresponding aperture screens 21, reducing the entrainment of fine powder and the leakage of coarse powder. Simultaneously, the serpentine trajectory slows the falling speed of the magnetic powder within the screening cylinder 10, avoiding insufficient screening due to excessively high powder flow rates. Combined with the vibration of the screens 21, the overall screening process is both efficient and stable, resulting in a finished magnetic powder product with a uniform particle size distribution and improved quality.

[0033] Reference Figure 4 and Figure 6 As shown, in order to avoid the accumulation of magnetic powder on the screen 21 due to excessive material input at one time, the feed inlet on the upper side of the screening cylinder 10 is set as a tapered opening. A feed cylinder 24 is installed on the screening cylinder 10 corresponding to its feed inlet, which extends out of the screening box 1. The feed cylinder 24 and the screening box 1 are spaced apart so that the feed cylinder 24 and the screening cylinder 10 as a whole vibrate and shift at the screening box 1. The drive shaft 20 extends to the feed cylinder 24 and is fitted with an auger blade 240 that abuts against the inside of the feed cylinder 24. During the feeding process, after the magnetic powder is fed into the feed cylinder 24, it first falls onto the auger blades 240. After the drive shaft 20 rotates and drives the auger blades 240 to rotate inside the feed cylinder 24, the spirally rotating auger blades 240 guide and transport the magnetic powder falling into the feed cylinder 24, thereby controlling the amount of magnetic powder fed into the screening cylinder 10 and avoiding the problem of excessive magnetic powder being fed at one time, which would cause the magnetic powder to accumulate on the screen 21 and affect the screening efficiency of the screen 21.

[0034] Furthermore, referring to Figure 4 , Figure 7 and Figure 8As shown, in order to improve the efficiency of the magnetic powder screening by the several screens 21, a limiting sleeve 25 is also sleeved on the drive shaft 20 between the drive end and the eccentric block 22. The drive shaft 20 is connected to the drive end through the limiting sleeve 25. A guide groove is formed on the drive shaft 20. The guide groove includes two vertical grooves and two spiral grooves. The two vertical grooves and the spiral grooves are distributed at intervals and connected end to end in sequence. A driven guide rod 251 is connected to the limiting sleeve 25 and is slidably inserted in the guide groove. The driven guide rod 251 slides and adjusts sequentially along the two vertical grooves and the spiral grooves. After the limiting sleeve 25 is driven to rotate by the driving end, the rotation of the limiting sleeve 25 causes the driven guide rod 251 to move relative to the guide groove on the driving shaft 20, pushing the driving shaft 20 to reciprocate along the axial direction inside the limiting sleeve. This causes the several screens 21 sleeved on the driving shaft 20 to simultaneously achieve a composite action of axial translation and high-frequency vibration, further disrupting the serpentine movement rhythm of the magnetic powder. This allows the magnetic powder to continuously change its movement direction within the screening cylinder 10, which not only extends the effective screening time but also increases the contact probability between magnetic powder of different particle sizes and the screens 21, significantly improving the overall screening efficiency and separation accuracy.

[0035] Furthermore, through the cooperation between the driven guide rod 251 and the guide groove (that is, when the driven guide rod 251 slides to any one of the spiral grooves, it will drive the drive shaft 20 to rotate and drive the drive shaft 20 to slide upward along the limiting sleeve 25 along the spiral groove; when the driven guide rod 251 slides to the vertical groove adjacent to the spiral groove, the drive shaft 20 and several screens 21 are driven by their own gravity to drive the driven guide rod 251 to move downward along the vertical groove, and so on), it will also drive the drive shaft 20 to rotate intermittently during axial sliding, thereby driving the auger blades 240 to rotate intermittently, intermittently guiding and conveying magnetic powder into the screening cylinder 10, so as to further achieve the effect of controlling the amount of magnetic powder falling into the screening cylinder 10, avoiding the problem of too much magnetic powder accumulating on the screens 21 and reducing the screening efficiency of the screens 21.

[0036] Reference Figure 4 and Figure 5 As shown, in order to promptly discharge the coarse magnetic powder particles retained on the screen 21 and avoid them hindering the subsequent magnetic powder and affecting the screening efficiency of the screen 21, discharge outlets 26 are provided on the screening cylinder 10 corresponding to several screens 21. Initially, the driven guide rod 251 is located at one of the guide grooves, so that several screens 21 on the drive shaft 20 are all located above the corresponding discharge outlets 26.

[0037] When the drive shaft 20 is driven to rotate and slide, the drive shaft 20 and several screens 21 are first driven to slide upward. When the driven guide rod 251 slides to the adjacent vertical groove, it is affected by gravity and moves downward along the vertical groove, so that the screens 21 move down to the lower side of the discharge port 26, so that the coarse magnetic powder particles on the screens 21 can be discharged from the discharge port 26. After the driven guide rod 251 slides to another adjacent spiral groove, the drive shaft 20 and the screens 21 are driven to move upward as a whole, while the drive shaft 20 is driven to rotate. This process is repeated.

[0038] Reference Figure 7 As shown, in order to discharge the magnetic powder completed by the bottom screen 21 of the screening cylinder 10, a discharge cylinder 27 extending out of the screening box 1 is provided at the bottom of the screening cylinder 10.

[0039] Reference Figure 7 As shown, a pusher frame is fitted on the drive shaft 20, corresponding to and fitting against the inner bottom wall of the screening cylinder 10. The rotation of the drive shaft 20 drives the pusher frame to rotate inside the screening cylinder 10, thereby applying centrifugal force to the magnetic powder after screening at the bottom of the screening cylinder 10, driving the magnetic powder to be discharged from the discharge cylinder 27.

[0040] During operation: First, the raw or pre-processed magnetic powder to be processed is gradually conveyed into the screening cylinder 10 through the screening mechanism 2, so that the magnetic powder falls onto the screen 21 in batches, avoiding the excessive amount of magnetic powder conveyed at one time being concentrated on the screen 21. After the magnetic powder falls onto the screen 21, it slides along the inclined screen 21 under the influence of its own gravity, guiding it to first disperse naturally on the screen 21 and be separated and screened by the screen 21.

[0041] The second step is to drive the eccentric block 22 to rotate. The centrifugal effect of the eccentric block 22 acts on the drive shaft 20, the screening box 1 and the screen 21 to generate high-frequency vibration, which further improves the efficiency of the screen 21 in screening magnetic powder of different particle sizes.

[0042] Step 3: After the magnetic powder falls into the screening cylinder 10, it is screened layer by layer by the multi-layer screens 21 of the screening cylinder 10 under the influence of its own gravity and the vibration of the screen 21. Finally, the magnetic powder after screening is discharged from the bottom of the screening cylinder 10, while the remaining coarse particles separated by the screen 21 are discharged from the screening cylinder 10 in time during the screening process.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetic particle vibrating screen with multiple layers of screens (21), comprising a screening box (1), characterized in that: The screening box (1) is provided with a screening cylinder (10). The screening box (1) and the screening cylinder (10) are cooperated by a screening mechanism (2). The screening mechanism (2) includes a drive shaft (20) axially inserted on the screening cylinder (10). Several screens (21) are arranged at intervals along the axial direction of the drive shaft (20). The screens (21) are inclined and located in the screening cylinder (10). Several screen holes are uniformly formed on the screens (21). After the drive shaft (20) passes through the screening cylinder (10), an eccentric block (22) is sleeved on it. The drive shaft (20) and the screening box (1) are cooperated by a drive end.

2. A magnetic powder vibrating screen with multiple layers of screens (21) according to claim 1, characterized in that: The aperture of the sieve holes on the plurality of sieves (21) is set to gradually decrease from top to bottom.

3. A magnetic powder vibrating screen with multiple layers of screens (21) according to claim 1, characterized in that: The tilt angles of any two adjacent screens (21) inside the screening cylinder (10) are set opposite.

4. A magnetic powder vibrating screen with multiple screens (21) according to claim 1, characterized in that: The screening cylinder (10) is equipped with a feed cylinder (24) corresponding to its feed inlet, and the drive shaft (20) is fitted with an auger blade (240) that abuts against the inside of the feed cylinder (24).

5. A magnetic powder vibrating screen with multiple layers of screens (21) according to claim 1, characterized in that: The drive shaft (20) is also fitted with a limiting sleeve (25) located between the drive end and the eccentric block (22). The drive shaft (20) is connected to the drive end through the limiting sleeve (25). A guide groove is formed on the drive shaft (20). A driven guide rod (251) that slides and is inserted into the guide groove is connected to the limiting sleeve (25).

6. A magnetic powder vibrating screen with multiple screens (21) according to claim 1, characterized in that: The screening cylinder (10) is provided with outlets (26) corresponding to several screens (21).

7. A magnetic powder vibrating screen with multiple screens (21) according to claim 1, characterized in that: The bottom of the screening cylinder (10) is provided with a discharge cylinder (27) that extends out of the screening box (1).

8. A magnetic powder vibrating screen with multiple layers of screens (21) according to claim 1, characterized in that: The drive shaft (20) is fitted with a push frame that corresponds to and fits against the bottom wall of the screening cylinder (10).

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