Box type metal screening system and screening method

Abstract

The present invention relates to a box-type metal screening system and screening method, the screening system comprises a box, a sleeve assembly, a magnetic rod assembly, and a driving assembly. On the one hand, the present invention drives multiple magnetic rods to be inserted or withdrawn through a fixed end plate, so that the sleeve can be switched between magnetism and demagnetization, so that the metal screened out of the powder can be adsorbed on the sleeve surface under magnetic attraction, and can also be automatically detached from the sleeve as it is demagnetized, which is simple to operate, labor-saving, and efficient; on the other hand, the multiple sleeves are driven to move by the rotation of the connecting plate to implement continuous stirring of the powder, ensuring that the metal in the powder is thoroughly screened out, and effectively improving the screening effect.

Description

Technical Field

[0001] The invention belongs to the field of separation technology, and in particular relates to a box-type metal screening system and also to a metal screening method. Background Art

[0002] In the powder industry, in order to separate different components in the material, it is often necessary for the material to have different flow directions and ultimately collect different materials.

[0003] At present, powder separation devices are widely used in powder fields such as food, medicine, ceramics, chemicals, plastics, and lithium batteries. In particular, in recent years, with the development of electric vehicles, lithium-ion batteries have developed rapidly, and the performance requirements for lithium-ion batteries have become increasingly higher, and the precision requirements for raw materials have become increasingly stringent. The most critical factor in determining the quality of lithium battery materials is the content of metal particles, so in order to fully separate the finished materials from the metal particles in the raw materials, a powder separation device is required. Traditional powder separation devices generally include permanent magnetic screeners and three-way valves. Magnetic bars are distributed in the inner cavity of the screener. When the powder is transported and passes through the screener, the metal particles in the powder are sucked away by the magnetic bars in the screener, and the remaining finished materials pass through the three-way valve and are collected to separate the materials from the metal particles.

[0004] However, in the actual production process, the existing permanent magnetic screener has the following defects:

[0005] 1. Due to the gaps between the magnetic bars, a small amount of metal particles cannot be successfully adsorbed by the magnetic bars when the powder passes through the screening device, resulting in poor screening effect;

[0006] 2. After the magnetic bar in the permanent magnetic screener adsorbs metal particles, the metal particles adsorbed on the surface of the magnetic bar need to be cleaned manually, which is time-consuming, labor-intensive and inefficient. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a new box-type metal screening system.

[0008] Meanwhile, the invention also provides a metal screening method.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] A box-type metal screening system comprises a box body, a sleeve assembly, a magnetic rod assembly, and a driving assembly, wherein the box body has an inner cavity, and the side, upper part, and lower part of the inner cavity are respectively formed with an open mouth, a feed port, and a discharge port; the sleeve assembly comprises a plurality of sleeves and a connecting plate for fixing the plurality of sleeves together, wherein the plurality of sleeves extend along the front-to-back direction, and a screening channel for powder to pass through is formed between two adjacent sleeves; the magnetic rod assembly comprises a plurality of magnetic rods and a fixed end plate for fixing the plurality of magnetic rods together, wherein the plurality of magnetic rods are correspondingly inserted into the plurality of sleeves; the driving assembly comprises a first driver for driving the connecting plate to rotate around an axis extending in the front-to-back direction, and a second driver for driving the fixed end plate to move along its own center line direction, wherein the magnetic rod assembly and the connecting plate move synchronously to adsorb metal in the powder and can gradually demagnetize it during rotation.

[0011] Preferably, the plurality of sleeves correspond to the plurality of magnetic bars one by one, so that each sleeve is provided with a magnetic bar, thereby improving the screening capacity.

[0012] Preferably, the plurality of sleeves are arranged in parallel and distributed in a circular array around the center line of the connecting plate.

[0013] Preferably, the connecting plate includes a first plate and a second plate located at both ends of the sleeve, wherein each sleeve passes through the first plate and the second plate from both ends to form an insertion hole, and the magnetic rod is inserted into the sleeve from the insertion hole. This arrangement effectively improves the connection stability of multiple sleeves, reduces deformation problems caused by high-speed rotation, and prolongs service life.

[0014] Specifically, the first driver includes a driving shaft passing through the center of the first plate and the second plate in the front-to-back direction, and a power member for driving the driving shaft to rotate, wherein the first plate and the second plate are fixed on the driving shaft, and the fixed end plate is rotatably and slidably arranged on the driving shaft. This arrangement has a simple structure and is easy to install and implement.

[0015] Preferably, the second driver includes a driving end plate and a telescopic rod whose telescopic direction is parallel to the extension direction of the driving shaft and is used to drive the driving end plate to move, wherein the driving end plate is connected to the driving shaft through a rotating joint, and when the driving end plate moves with the telescopic rod, the fixed end plate moves synchronously.

[0016] Specifically, the rotating joint includes a first joint seat slidably arranged on the driving shaft and a second joint seat rotatably arranged on the first joint seat, wherein the first joint seat is connected to the fixed end plate, and the second joint seat is connected to the driving end plate.

[0017] Furthermore, a support frame is provided on the outer side of the box body, the support frame includes a frame rod extending in a direction parallel to the driving shaft, the telescopic rod is arranged on the frame rod, and the driving end plate includes a plate body and an extension ear located on the side of the plate body, wherein the extension ear is connected to the telescopic rod in a one-to-one correspondence, and the extension ear is movably mounted on the frame rod. In this way, the driving end plate moves along the frame rod, which improves stability and ensures that the magnetic rod is accurately inserted into the sleeve.

[0018] Another technical solution of the present invention is a metal screening method, which adopts the above-mentioned box-type metal screening system and comprises the following steps:

[0019] S1. Magnetic bar assembly

[0020] Aligning and inserting a plurality of magnetic bars into a plurality of sleeves, with one end of the magnetic bar aligned with one end of the sleeve and the other end protruding from the sleeve, and a fixed end plate being located at the end of the magnetic bar protruding from the sleeve;

[0021] S2. Metal adsorption

[0022] After the powder passes through the screening channel from the feed port, it is discharged from the discharge port. The screening channel shifts in the inner cavity as the connecting plate rotates to stir the passing powder. Multiple magnetic bars rotate synchronously with the rotation of multiple sleeves, and the metal in the powder is adsorbed on the surface of the sleeve.

[0023] S3, degaussing

[0024] After the addition of powder is stopped, the plurality of magnetic rods are withdrawn from the plurality of sleeves, causing the sleeves to lose their magnetism and metal to fall off the surface of the sleeves.

[0025] Preferably, in S3, the multiple magnetic bars rotate synchronously with the rotation of the multiple sleeves, and synchronously pull out the multiple sleeves along their own length direction, the sleeves are gradually demagnetized, and the metal is separated from the sleeves under centrifugal force. In this way, during the demagnetization process, the centrifugal force is used to throw off the metal particles attached to the surface of the sleeve, ensuring that the metal particles are completely unloaded and avoiding affecting the next powder screening.

[0026] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0027] On the one hand, the present invention drives multiple magnetic rods to be inserted or withdrawn through a fixed end plate, so that the sleeve can be switched between magnetism and demagnetization. In this way, the metal screened out from the powder can be adsorbed on the surface of the sleeve under the magnetic attraction force, and can also automatically detach from the sleeve as it is demagnetized. The operation is simple, labor-saving and efficient. On the other hand, the multiple sleeves are driven to move by the rotation of the connecting plate to implement continuous stirring of the powder, thereby ensuring that the metal in the powder is completely screened out and effectively improving the screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the box-type metal screening system according to Example 1 of the present invention;

[0029] Figure 2 This is an exploded schematic diagram of a box-type metal screening system according to Example 1 of the present invention (first perspective);

[0030] Figure 3 This is an exploded schematic diagram of the box-type metal screening system of Example 1 of the present invention (second viewing angle);

[0031] Figure 4 This is a structural schematic diagram of a box-type metal screening system according to Example 2 of the present invention (magnetic bar assembly);

[0032] Figure 5 It is a structural schematic diagram of a box-type metal screening system according to Example 2 of the present invention (degaussing);

[0033] Wherein: 1, box body; q, inner cavity; k0, open mouth; k1, feed inlet; k2, discharge outlet; k4, water inlet; k5, water outlet; j, support frame; j0, frame rod; j1, connecting rod; b, fixed frame plate;

[0034] 2. sleeve assembly; 20. sleeve; k3. insertion hole; 21. connecting plate; 211. first plate; 212. second plate; t. sleeve;

[0035] 3. Magnetic rod assembly; 30. Magnetic rod; 31. Fixed end plate;

[0036] 4. Drive assembly; 41. First drive; 410. Drive shaft; 411. Power member; 42. Second drive; 420. Drive end plate; a0. Plate body; a1. Extension ear; s. Rotating joint; s1. First joint seat; s2. Second joint seat; 421. Telescopic rod. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0042] Example 1

[0043] like Figures 1 to 3 As shown, the box-type metal screening system of this embodiment is used for screening metal in powder, and includes a box body 1, a sleeve assembly 2, a magnetic rod assembly 3, and a driving assembly 4.

[0044] Specifically, the box body 1 has an inner cavity q, wherein the side, upper part and lower part of the inner cavity q are respectively formed with an open port k0, a feed port k1 and a discharge port k2.

[0045] In this example, the sleeve assembly 2 includes a plurality of sleeves 20 extending horizontally along the front-to-back direction, and a connecting plate 21 for fixing the plurality of sleeves 20 together, wherein the plurality of sleeves 20 are distributed in a circular array around the center line direction of the connecting plate 21, and a screening channel for powder to pass through is formed between two adjacent sleeves 20.

[0046] Specifically, the connecting plate 21 includes a first plate 211 and a second plate 212 located at both ends of each sleeve 20, wherein each sleeve 20 penetrates the first plate 211 and the second plate 212 from both ends to form an insertion hole k3. This arrangement effectively improves the connection stability of multiple sleeves, reduces deformation problems caused by high-speed rotation, and prolongs service life.

[0047] In this example, the magnetic bar assembly 3 includes a plurality of magnetic bars 30 extending horizontally along the front-back direction, and a fixed end plate 31 for fixing the outer ends of the plurality of magnetic bars 30, wherein the plurality of magnetic bars 30 are inserted into the plurality of sleeves 20 one by one from the insertion holes k3. This arrangement ensures that a magnetic bar is inserted into each sleeve, thereby improving the screening capacity.

[0048] In this example, the driving assembly 4 includes a first driver 41 for driving the connecting plate 21 to rotate around an axis extending horizontally in the front-to-back direction, and a second driver 42 for driving the fixed end plate 31 to move along its own center line direction, wherein the magnetic rod assembly 3 and the connecting plate 21 move synchronously to absorb metal particles in the powder and gradually demagnetize them during rotation.

[0049] Specifically, the first driver 41 includes a driving shaft 410 horizontally passing through the center of the first plate 211 and the second plate 212 along the front-to-back direction, and a power member 411 for driving the driving shaft 410 to rotate, wherein the first plate 211 and the second plate 212 are fixed on the driving shaft 410, and the fixed end plate 31 is rotatably and slidably arranged on the driving shaft 410. Such an arrangement has a simple structure and is easy to install and implement.

[0050] In order to further facilitate implementation, a shaft sleeve t sleeved on the driving shaft 410 is further connected between the first plate 211 and the second plate 212 .

[0051] The second driver 42 includes a driving end plate 420, a telescopic rod 421 whose telescopic direction is parallel to the extension direction of the driving shaft 410 and is used to drive the driving end plate 420 to move, wherein the driving end plate 420 is connected to the driving shaft 410 through a rotating joint s, and when the driving end plate 420 moves with the telescopic rod 421, the fixed end plate 31 moves synchronously. In some specific embodiments, the telescopic rod 421 adopts a conventional telescopic cylinder, and the telescopic cylinder is connected to the driving end plate 420 from the end of the telescopic shaft.

[0052] Specifically, the rotating joint s includes a first joint seat s1 slidably disposed on the driving shaft 410 and a second joint seat s2 rotatably disposed on the first joint seat s1 , wherein the first joint seat s1 is connected to the fixed end plate 31 , and the second joint seat s2 is connected to the driving end plate 420 .

[0053] In order to further facilitate the implementation, a support frame j is provided on the outside of the box body 1, and the support frame j includes a frame rod j0 located on the left and right sides of the box body 1 and extending in a direction parallel to the driving shaft 410, a connecting rod j1 connected between the frame rods j0 on both sides, and two telescopic rods 421 are respectively fixedly arranged on the frame rods j0 on both sides; the driving end plate 420 includes a plate body a0, and extension ears a1 located on the left and right sides of the plate body a0, wherein the extension ears a1 are connected to the telescopic rods 421 in a one-to-one correspondence, and each extension ear a1 is movably mounted on the corresponding frame rod j0. In this way, the driving end plate moves along the frame rod, which improves stability and ensures that the magnetic rod is accurately inserted into the sleeve.

[0054] In summary, the implementation process of this embodiment is as follows:

[0055] S1. Magnetic bar assembly

[0056] Align and insert multiple magnetic bars 30 into multiple sleeves 20, with one end of each magnetic bar 30 aligned with one end of the sleeve 20 and the other end protruding from the sleeve 20, and the fixed end plate 31 is located at the end of the magnetic bar 30 protruding from the sleeve 20;

[0057] S2. Metal adsorption

[0058] After the powder passes through the screening channel from the feed port k1, it is discharged from the discharge port k2. The screening channel is displaced in the inner cavity q as the connecting plate 21 rotates to stir the passing powder. The multiple magnetic bars 30 rotate synchronously with the rotation of the multiple sleeves 20, and the metal in the powder is adsorbed on the surface of the sleeve 20.

[0059] S3, degaussing

[0060] After the addition of powder is stopped, the multiple magnetic bars 30 rotate synchronously with the rotation of the multiple sleeves 20, and move along their own length direction to synchronously pull out the multiple sleeves 20, so that the sleeves 20 are gradually demagnetized and the metal automatically separates from the sleeves 20 under the centrifugal force.

[0061] Therefore, this embodiment has the following advantages:

[0062] 1. The fixed end plate drives multiple magnetic rods to be inserted or pulled out, so that the sleeve can be switched between magnetic and demagnetized. In this way, the metal screened out of the powder can be adsorbed on the surface of the sleeve under the magnetic attraction, and can also be automatically detached from the sleeve as it is demagnetized. The operation is simple, labor-saving and efficient.

[0063] 2. The connecting plate rotates to drive multiple sleeves to continuously stir the powder, ensuring that the metal particles in the powder are completely screened out, effectively improving the screening effect;

[0064] 3. During the demagnetization process, centrifugal force is used to shake off the metal particles attached to the surface of the casing to ensure that the metal particles are completely unloaded to avoid affecting the next powder screening;

[0065] 4. By setting connecting plates connected to both ends of the sleeves, the connection stability of multiple sleeves is effectively improved, the deformation problem caused by high-speed rotation is reduced, and the service life is extended.

[0066] Example 2

[0067] like Figure 4 and Figure 5 As shown, the metal screening system of this embodiment can also be used for screening metals in fluids, and includes a box body 1, a sleeve assembly 2, a magnetic rod assembly 3, and a drive assembly 4 that are similar in structure to those of embodiment 1, and the differences are as described below.

[0068] Specifically, the box body 1 is in the shape of a horizontally extending cylinder, wherein a feed port k1 and a discharge port k2 are formed at the upper side and the lower side of the box body 1 respectively, and an open port k0 is formed at one end of the cylinder.

[0069] At the same time, a water inlet k4 and a water outlet k5 are formed on the upper and lower sides of the box body 1, respectively, wherein the line between the feed inlet k1 and the outlet k2 and the line between the feed inlet k1 and the outlet k2 intersect at the center line of the box body 1. This arrangement improves the screening effect of metals in the fluid and the flushing effect of the metals screened out of the box body 1.

[0070] In this example, a fixed frame plate b is fixedly connected to the end of the box body 1 away from the open opening k0, and two telescopic rods 421 are located on opposite sides of the box body 1 and are respectively fixedly connected to the fixed frame plate b; the driving end plate 420 is respectively fixedly connected to the telescopic ends of the two telescopic rods 421 from opposite sides; the magnetic rod assembly 3 is fixedly arranged on the driving end plate 420 and moves synchronously with the driving end plate 420 along the center line direction of the box body 1.

[0071] In this example, the first plate 211 and the second plate 212 in the sleeve assembly 2 are fixedly connected to the inner wall of the box body 1 in a conventional connection manner, wherein the first plate 211 or the second plate 212 can seal the open opening k0, and multiple sleeves 20 are stationary in the inner cavity of the box body 1.

[0072] Therefore, the implementation process of this embodiment is as follows:

[0073] S1. Magnetic bar assembly

[0074] Align and insert multiple magnetic bars 30 into multiple sleeves 20, with one end of each magnetic bar 30 aligned with one end of the sleeve 20 and the other end protruding from the sleeve 20, and the fixed end plate 31 is located at the end of the magnetic bar 30 protruding from the sleeve 20;

[0075] S2. Metal adsorption

[0076] Open the feed port k1 and the discharge port k2, and keep the water inlet k4 and the water outlet k5 closed. After the fluid passes through the screening channel from the feed port k1, it is discharged from the discharge port k2;

[0077] S3, degaussing

[0078] After the addition of fluid is stopped, the feed port k1 and the discharge port k2 are closed, and the multiple magnetic rods 30 move synchronously along their own length direction and pull out the multiple sleeves 20, causing the sleeves 20 to be gradually demagnetized. Then the water inlet k4 and the water outlet k5 are opened, and the cleaning liquid enters the inner cavity of the box body 1 from the water inlet k4 and is discharged from the water outlet k5. The metal automatically separates from the sleeve 20 under the flushing action of the cleaning liquid and is discharged with the cleaning liquid.

[0079] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A box-type metal screening system, characterized in that: It comprises a box body, a sleeve assembly, a magnetic rod assembly, and a driving assembly, wherein the box body has an inner cavity, and the side, upper part, and lower part of the inner cavity are respectively formed with an open mouth, a feed port, and a discharge port; the sleeve assembly comprises a plurality of sleeves and a connecting plate for fixing the plurality of sleeves together, wherein the plurality of sleeves extend along the front-to-back direction, and a screening channel for powder to pass through is formed between two adjacent sleeves; the magnetic rod assembly comprises a plurality of magnetic rods and a fixed end plate for fixing the plurality of magnetic rods together, wherein the plurality of magnetic rods are correspondingly inserted into the plurality of sleeves; the driving assembly comprises a first driver for driving the connecting plate to rotate around an axis extending in the front-to-back direction, and a second driver for driving the fixed end plate to move along its own center line direction, wherein the magnetic rod assembly and the connecting plate move synchronously, so that the sleeve absorbs the metal in the powder and can be gradually demagnetized during rotation, and during the gradual demagnetization, the metal separates from the sleeve under centrifugal force; The connecting plate comprises a first plate and a second plate located at two ends of the sleeve, wherein each sleeve respectively penetrates the first plate and the second plate from two ends to form an insertion hole, and the magnetic bar is inserted into the sleeve from the insertion hole; The first driver comprises a driving shaft passing through the center of the first plate and the second plate in the front-rear direction, and a power member for driving the driving shaft to rotate, wherein the first plate and the second plate are fixed on the driving shaft, and the fixed end plate is rotatably and slidably arranged on the driving shaft; The second driver includes a driving end plate and a telescopic rod whose telescopic direction is parallel to the extension direction of the driving shaft and is used to drive the driving end plate to move, wherein the driving end plate is connected to the driving shaft through a rotating joint, and when the driving end plate moves with the telescopic rod, the fixed end plate moves synchronously.

2. The box-type metal screening system according to claim 1 is characterized in that: The plurality of sleeves correspond to the plurality of magnetic bars one by one.

3. The box-type metal screening system according to claim 1 or 2, characterized in that: The plurality of sleeves are arranged in parallel and distributed in a circular array around the center line of the connection plate.

4. The box-type metal screening system according to claim 1, characterized in that: The rotating joint includes a first joint seat slidably arranged on the driving shaft and a second joint seat rotatably arranged on the first joint seat, wherein the first joint seat is connected to the fixed end plate, and the second joint seat is connected to the driving end plate.

5. The box-type metal screening system according to claim 1, characterized in that: A support frame is provided on the outer side of the box body, and the support frame includes a frame rod extending in a direction parallel to the driving axis, and the telescopic rod is arranged on the frame rod. The driving end plate includes a plate body and an extension ear located on the side of the plate body, wherein the extension ear is connected with the telescopic rod in a one-to-one correspondence, and the extension ear is movably mounted on the frame rod.

6. A metal screening method, characterized in that: The method adopts the box-type metal screening system according to any one of claims 1 to 5, and the method comprises the following steps: S1. Magnetic bar assembly Aligning and inserting a plurality of magnetic bars into a plurality of sleeves, with one end of the magnetic bar aligned with one end of the sleeve and the other end protruding from the sleeve, and a fixed end plate being located at the end of the magnetic bar protruding from the sleeve; S2. Metal adsorption After the powder passes through the screening channel from the feed port, it is discharged from the discharge port. The screening channel shifts in the inner cavity as the connecting plate rotates to stir the passing powder. Multiple magnetic bars rotate synchronously with the rotation of multiple sleeves, and the metal in the powder is adsorbed on the surface of the sleeve. S3, degaussing After the addition of powder is stopped, the plurality of magnetic rods are withdrawn from the plurality of sleeves, causing the sleeves to lose their magnetism and metal to fall off the surface of the sleeves.

7. The metal screening method according to claim 6, characterized in that: In S3, the plurality of magnetic bars rotate synchronously with the rotation of the plurality of sleeves, and move along their own length direction to synchronously pull out the plurality of sleeves, the sleeves are gradually demagnetized, and the metal is separated from the sleeves under the centrifugal force.

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