Magnetic separator

Abstract

To provide a magnetic separator that can suppress the outflow of liquid to the outside. [Solution] A magnet separator according to one embodiment comprises a tank section into which a liquid containing a magnetic material is introduced; a magnet drum provided in the tank section for adsorbing the magnetic material; a squeezing roll provided above the magnet drum for squeezing the liquid adhering to the magnetic material; and a drive unit provided in the tank section for rotating the magnet drum and the squeezing roll. The squeezing roll has a shaft; a cylindrical section connected to the shaft and including a first end face and a second end face located opposite the first end face; a first damming plate provided on the shaft at a distance from the first end face; and a second damming plate provided on the shaft at a distance from the second end face. The first damming plate and the second damming plate are located within the tank section.

Description

Technical Field

[0001] The present invention relates to a magnetic separator.

Background Art

[0002] When machining a metal material with a machine tool, various liquids called grinding fluid, cutting fluid, coolant, etc. are used for the purpose of improving machining accuracy, extending the life of the tools used, and promoting the discharge of chips and metal powder. These liquids are discharged from the machine tool in a state containing foreign substances such as chips and metal powder generated by machining.

[0003] The liquid discharged from the machine tool is reused after separating and removing foreign substances such as chips. Therefore, various devices for collecting the liquid discharged from the machine tool and separating and removing foreign substances from the liquid are known. For example, a magnetic separator is known as a device for separating and removing foreign substances containing magnetic substances from a liquid (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Regarding the structure of the magnetic separator, there is still room for various improvements. For example, in the process of separating magnetic substances contained in the inflowing liquid, there is a risk that the liquid may flow out of the outside of the filtration tank through the throttle roll, and it is desired to suppress such an outflow of the liquid.

[0006] Therefore, one of the objects of the present invention is to provide a magnetic separator capable of suppressing the outflow of the liquid to the outside.

Means for Solving the Problems

[0007] A magnet separator according to one embodiment comprises a tank section into which a liquid containing a magnetic material is introduced; a magnet drum provided in the tank section for adsorbing the magnetic material; a squeezing roll provided above the magnet drum for squeezing the liquid adhering to the magnetic material; and a drive unit provided in the tank section for rotating the magnet drum and the squeezing roll. The squeezing roll has a shaft; a cylindrical section connected to the shaft and including a first end face and a second end face located opposite the first end face; a first damming plate provided on the shaft at a distance from the first end face; and a second damming plate provided on the shaft at a distance from the second end face. The first and second damming plates are located within the tank section.

[0008] The squeezing roll may define spaces for the liquid to accumulate between the first damming plate and the first end face, and between the second damming plate and the second end face. The first distance between the first damming plate and the first end face may be smaller than the second distance between the first damming plate and the side wall of the tank section.

[0009] The lower end of the first damming plate may be located below the upper end of the side wall of the tank section. The first damming plate and the second damming plate may be made of rubber material. The magnet separator may further include a first throttling roll adjustment mechanism and a second throttling roll adjustment mechanism provided in the tank section for adjusting the distance between the magnet drum and the throttling roll. The first throttling roll adjustment mechanism and the second throttling roll adjustment mechanism may rotatably support the shaft. The first damming plate may be provided between the first end face and the first throttling roll adjustment mechanism. The second damming plate may be provided between the second end face and the second throttling roll adjustment mechanism. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a magnetic separator that can suppress the outflow of liquid to the outside. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic perspective view of a magnetic separator according to one embodiment. [Figure 2] Figure 2 is a schematic front view of a magnetic separator according to one embodiment. [Figure 3] Figure 3 is a schematic front view of a drawing roll in one embodiment. [Figure 4] Figure 4 is an enlarged view of a blocking plate in one embodiment. [Figure 5] Figure 5 is an enlarged view of a barrier plate in one embodiment. [Figure 6] Figure 6 is a schematic front view showing the drawing roll of a magnetic separator according to a comparative example. [Figure 7] Figure 7 shows an example of a damming structure applicable to a drawing roll. [Figure 8] Figure 8 shows another example of a damming structure applicable to a drawing roll. [Modes for carrying out the invention]

[0012] The following describes one embodiment of the magnetic separator with reference to the drawings. It should be noted that the disclosure is merely an example, and the invention is not limited by the contents described in the embodiments below. Modifications that a person skilled in the art can easily conceive are naturally included within the scope of the disclosure. In order to make the explanation clearer, the size, shape, etc. of each part may be schematically represented in the drawings with modifications from the actual embodiments. In some cases, the same reference numerals are used for corresponding elements in multiple drawings, and detailed explanations are omitted.

[0013] In an embodiment, a first direction X, a second direction Y, and a third direction Z that are orthogonal to each other are defined. When one side of the second direction Y is referred to as "front" or "forward", the other side of the second direction Y may be referred to as "rear" or "backward". When one side of the third direction Z is referred to as "up" or "above", the other side of the third direction Z may be referred to as "down" or "below".

[0014] In the present embodiment, a magnet separator for separating or removing mainly magnetic substances from foreign substances contained in a liquid such as grinding fluid discharged from a machine tool such as a grinding machine is disclosed. The liquid includes a water-soluble liquid and an oil-based liquid. The magnetic substances are, for example, metal powder, abrasive grains, etc. The magnetic substances have the property of being attracted by a magnetic force.

[0015] FIG. 1 is a schematic perspective view of a magnet separator 100 according to the present embodiment. FIG. 2 is a schematic front view of the magnet separator 100 according to the present embodiment. In FIG. 2, the magnet separator 100 is viewed from a direction opposite to the second direction Y.

[0016] As shown in FIGS. 1 and 2, the magnet separator 100 includes a tank portion 10, a magnetic drum 20 provided in the tank portion 10, a drive portion 30 provided outside the tank portion 10, a scraping plate 41, a squeezing roll 50, squeezing roll adjusting mechanisms 60A and 60B, and a transmission mechanism 70. In the present embodiment, the squeezing roll adjusting mechanism 60A corresponds to the first squeezing roll adjusting mechanism, and the squeezing roll adjusting mechanism 60B corresponds to the second squeezing roll adjusting mechanism.

[0017] As shown in the example of FIG. 1, the tank portion 10 has a substantially rectangular parallelepiped shape that is long in the second direction Y. In a plan view, the region surrounded by the tank portion 10 may be referred to as "inside the tank portion 10" or "within the tank portion 10".

[0018] The tank portion 10 is open at the top, and liquid is introduced into the storage portion 10a of the tank portion 10 from above. The inside of the tank portion 10 includes the storage portion 10a. The liquid contains foreign matter including a magnetic substance. The size of the tank portion 10 is appropriately changed according to the processing amount of the liquid by the magnet drum 20. The tank portion 10 is formed by bending a plate material such as stainless steel, for example.

[0019] The tank portion 10 has a bottom wall 11 and side walls 12A, 12B arranged in the first direction X. The bottom wall 11 of the tank portion 10 has a discharge port 11a that opens downward. The magnetic separator 100 discharges the liquid from which foreign matter has been separated and removed from the discharge port 11a. The discharge port 11a is located below the magnet drum 20.

[0020] The magnet drum 20 adsorbs the magnetic substance contained in the liquid. The magnet drum 20 has a shaft 21 extending in the first direction X, a cylindrical portion 22 fixed to the shaft 21, a cylindrical portion 23 covering the cylindrical portion 22, and a magnet 24 provided between the cylindrical portion 22 and the cylindrical portion 23.

[0021] The shaft 21 is fixed to the tank portion 10. The cylindrical portion 23 is provided on the shaft 21 so as to be rotatable about a rotation axis CX1 extending in the first direction X. The cylindrical portion 23 rotates in the circumferential direction θ with respect to the rotation axis CX1 as shown by the arrow in FIG. 1.

[0022] The magnet 24 is provided on the outer peripheral surface of the cylindrical portion 22. The outer peripheral surface has a region where the magnet 24 is arranged and a region where the magnet 24 is not arranged. Thereby, the magnet 24 forms a magnetic field region MA where the magnetic substance can be adsorbed and a non-magnetic field region NMA on the outer peripheral surface 231 of the cylindrical portion 23.

[0023] The magnetic field region MA is a region that is relatively strongly influenced by the magnetic field of, for example, magnet 24. The non-magnetic field region NMA is a region where the influence of magnet 24's magnetic field is almost negligible, or less than that of the magnetic field region MA. The range of the magnetic field region MA can be changed as appropriate.

[0024] The magnet 24 is, for example, a permanent magnet. The magnet 24 includes, for example, a plurality of magnets extending in a first direction X. The plurality of magnets are, for example, arranged with alternating north and south poles.

[0025] As shown in Figure 2, the magnetic drum 20 further has a shaft 25 extending outward from the tank section 10. The shaft 25 is aligned with the shaft 21. The shaft 25 is connected to the cylindrical section 23 and penetrates the side wall 12A of the tank section 10.

[0026] Each element constituting the magnetic drum 20, with the exception of the magnet 24, is formed from a non-magnetic material such as stainless steel. Note that each element may also include parts made from metal materials other than stainless steel or resin molded products.

[0027] The drive unit 30 rotates the magnet drum 20 and the squeezing roll 50. The drive unit 30 is mounted on the side wall 12A of the tank section 10 via a bracket B1 (shown in Figure 2). The drive unit 30 includes a motor 31. The input shaft of the drive unit 30 is connected to the shaft 25 of the magnet drum 20, for example, via a coupling (not shown). In this embodiment, the cylindrical section 23 rotates together with the shaft 25 when the motor 31 is driven.

[0028] The scraping plate 41 can scrape off foreign matter that has been attracted to the outer surface 231 of the magnet drum 20. The scraping plate 41 is positioned in front of the magnet drum 20 in the second direction Y.

[0029] The scraping plate 41 is provided, for example, over substantially the entire width of the cylindrical portion 23 in the first direction X. The tip of the scraping plate 41 is bent so as to face the outer circumferential surface 231, and the tip is in contact with the outer circumferential surface 231. The tip faces the non-magnetic field region NMA.

[0030] The scraping plate 41 is formed from, for example, a metal material such as stainless steel or iron, or a resin material such as polyurethane or ultra-high molecular weight polyethylene. The shape of the scraping plate 41 may also be other shapes, such as a flat plate that does not have bends.

[0031] The squeezing roll 50 can squeeze the liquid adhering to the magnetic material on the magnet drum 20. The squeezing roll 50 is located above the magnet drum 20. The squeezing roll adjustment mechanisms 60A and 60B are provided on the side walls 12A and 12B of the tank section 10 so as to be located on both sides of the first direction X of the squeezing roll 50, as shown in Figure 2.

[0032] The throttling roll 50 has a shaft 51 and a cylindrical portion 52 connected to the shaft 51. The cylindrical portion 52 has an outer circumferential surface 521. The outer circumferential surface 521 is formed of, for example, hard rubber. The throttling roll adjustment mechanisms 60A and 60B support the shaft 51 so that it can rotate around a rotation axis CX2 extending in a first direction X. As a result, the cylindrical portion 52 rotates together with the shaft 51.

[0033] The aperture roll adjustment mechanisms 60A and 60B can adjust the distance between the magnet drum 20 and the aperture roll 50. As a result, the outer surface 521 is in contact with the outer surface 231 of the magnet drum 20 at a predetermined pressure by the aperture roll adjustment mechanisms 60A and 60B.

[0034] The transmission mechanism 70 transmits the rotational motion of the drive unit 30 to the throttling roll 50. The transmission mechanism 70 is provided between the tank unit 10 and the drive unit 30. As shown in Figure 2, the transmission mechanism 70 has a first rotating body 71 and a second rotating body 72 that is located above the first rotating body 71 and meshes with the first rotating body 71.

[0035] The first rotating body 71 is attached to the shaft 25 of the magnet drum 20, and the second rotating body 72 is attached to the shaft 51 of the throttling roll 50. For example, the first rotating body 71 is a sprocket, and the second rotating body 72 is a disc-shaped member including a roller chain that meshes with the teeth of the first rotating body 71. The second rotating body 72 is further away from the throttling roll 50 than the throttling roll adjustment mechanism 60A in the direction opposite to the first direction X.

[0036] When the first rotating body 71 rotates together with the shaft 25, the rotational driving force is transmitted to the second rotating body 72, and the throttling roll 50 rotates together with the second rotating body 72. In other words, the throttling roll 50 rotates together with the magnet drum 20. In this embodiment, the throttling roll 50 rotates in the direction opposite to the circumferential direction θ, which is the rotation direction of the magnet drum 20.

[0037] Here, we will explain the flow of liquid in the magnetic separator 100. First, the liquid discharged from the machine tool is poured into the tank section 10 from above and temporarily stored in the storage section 10a. The tank section 10 further has an intermediate plate 13 provided along its outer circumferential surface 231.

[0038] A flow channel 80 is formed between the intermediate plate 13 and the outer surface 231 through which liquid flows from the storage section 10a. The flow channel 80 includes an inlet on the upstream side and an outlet on the downstream side. The liquid stored in the storage section 10a flows into the flow channel 80 from the inlet and moves along the flow channel 80 along the outer surface 231.

[0039] The cylindrical portion 23 is provided such that, for example, the lower part of the outer peripheral surface 231 is immersed in the liquid in the flow path 80, while the upper part of the outer peripheral surface 231 is exposed above the liquid surface. The magnetic field region MA is formed, for example, on the outer peripheral surface 231, extending from the region immersed in the liquid to the region facing the squeezing roll 50.

[0040] As a result, magnetic material contained in the foreign matter is attracted to the outer surface 231 as it passes through the channel 80. The cylindrical portion 23 rotates in the opposite direction to the flow direction of the liquid in the channel 80, that is, in the circumferential direction θ. The foreign matter attracted to the outer surface 231 is then squeezed by the squeezing roll 50 before it can be scraped off by the scraping plate 41.

[0041] Foreign matter squeezed out of the liquid by the squeezing roll 50 is scraped off from the outer surface 231 by the scraping plate 41. The scraped-off foreign matter is discharged to the outside through a foreign matter discharge port 42 located at the front of the tank section 10. Meanwhile, the liquid that has passed through the flow path 80 is discharged to the outside of the tank section 10 (for example, a clean tank) through the outlet and discharge port 11a.

[0042] Next, a configuration applicable to the diaphragm roll 50 in this embodiment will be described. Figure 3 is a schematic front view of the diaphragm roll 50 in this embodiment. In Figure 3, a portion is shown in cross-section.

[0043] As described above, the stencil roll 50 has a shaft 51 and a cylindrical portion 52 that rotates together with the shaft 51. The bearings 61 of the stencil roll adjustment mechanisms 60A and 60B rotatably support both ends of the shaft 51.

[0044] The drawing roll 50 further includes damming plates 53A and 53B provided on the shaft 51. In this embodiment, damming plate 53A corresponds to the first damming plate, and damming plate 53B corresponds to the second damming plate. The damming plates 53A and 53B rotate together with the shaft 51 and the cylindrical portion 52.

[0045] The damming plates 53A and 53B prevent the liquid adhering to the cylindrical portion 52 from flowing out of the tank portion 10. In other words, the squeezing roll 50 has a damming structure to prevent the liquid from flowing out. This structure is composed of the damming plates 53A and 53B.

[0046] In relation to the tank section 10, the cylindrical section 52 and the retaining plates 53A and 53B are located between the side walls 12A and 12B of the tank section 10 (inside the tank section 10). The cylindrical section 52 is located between retaining plate 53A and retaining plate 53B.

[0047] The cylindrical portion 52 has an end face 52a (first end face) and an end face 52b (second end face) located on the opposite side of the end face 52a in the first direction X. The blocking plate 53A is provided at a distance from the end face 52a of the cylindrical portion 52, and the blocking plate 53B is provided at a distance from the end face 52b of the cylindrical portion 52.

[0048] In other words, the damming plates 53A and 53B are not in contact with the cylindrical portion 52. Spaces SP1 for liquid accumulation are defined between damming plate 53A and end face 52a, and between damming plate 53B and end face 52b.

[0049] In relation to the aperture roll adjustment mechanisms 60A and 60B, the blocking plate 53A is provided between the end face 52a of the cylindrical portion 52 and the aperture roll adjustment mechanism 60A, and the blocking plate 53B is provided between the end face 52b of the cylindrical portion 52 and the aperture roll adjustment mechanism 60B.

[0050] Here, the configuration of the damming plates 53A and 53B will be explained using damming plate 53A. Figures 4 and 5 are enlarged views of damming plate 53A in this embodiment. In Figure 4, damming plate 53A is viewed from the direction opposite to the first direction X, and in Figure 5, damming plate 53A is viewed from the direction opposite to the second direction Y.

[0051] As shown in Fig. 4, the baffle plate 53A has a circular shape. Here, the circular shape is not limited to a perfect circle, but includes an oval shape, an elliptical shape, a shape lacking a part of these shapes, and a shape combining an arc shape and a linear shape. The outer diameter OD of the baffle plate 53A is larger than the outer diameter of the shaft 51 and not more than the outer diameter of the cylindrical portion 52. The outer diameters of the baffle plates 53A and 53B are preferably at least 20 mm larger than the outer diameter of the shaft 51, for example. Also, the thickness of the baffle plates 53A and 53B is, for example, from 1 mm to 5 mm. As shown in Fig. 4, the baffle plate 53A is fixed to the shaft 51 by a sealing material SB or the like.

[0052] As shown in Fig. 5, the baffle plate 53A has a surface 531 facing the end surface 52a of the cylindrical portion 52 and a surface 532 located on the opposite side of the surface 531. The distance D1 (first distance) between the surface 531 and the end surface 52a of the cylindrical portion 52 is preferably smaller than the distance D2 (second distance) between the surface 532 and the side wall 12A (D1 < D2). Note that the distance D1 corresponds to the size of the above-described space SP1. In other words, in the first direction X, the baffle plate 53A is located closer to the cylindrical portion 52 than the side wall 12A.

[0053] Also, the lower end 533 of the baffle plate 53A is located below the upper end 121 of the side wall 12A in the third direction Z. In other words, at least a part of the baffle plate 53A overlaps the side wall 12A in the first direction X.

[0054] Here, the configuration of the baffle plates 53A and 53B has been described using the baffle plate 53A, but the configuration of the baffle 53A can be applied to the baffle plate 53B. That is, the baffle plate 53B has a circular shape. The outer diameter of the baffle plate 53B is larger than the outer diameter of the shaft 51 and not more than the outer diameter of the cylindrical portion 52. The baffle plate 53B is fixed to the shaft 51 by a sealing material SB or the like.

[0055] Furthermore, the damming plate 53B has a surface 531 that faces the end face 52b of the cylindrical portion 52. Preferably, the distance between the surface 531 and the cylindrical portion 52 is smaller than the distance between the surface 532 and the side wall 12B. Moreover, the lower end of the damming plate 53B is located below the upper end of the side wall 12B in the third direction Z.

[0056] In this embodiment, the blocking plates 53A and 53B are formed of, for example, a rubber material. However, the blocking plates 53A and 53B may also be formed of a metal material, a resin material, or the like.

[0057] With the magnet separator 100 configured as described above, it is possible to suppress the outflow of liquid to the outside via the shaft 51 of the squeezing roll 50 during the process of separating the magnetic material. The effects of the magnet separator 100 according to this embodiment will now be explained.

[0058] Figure 6 is a schematic front view showing the squeezing roll 50E of a magnetic separator according to a comparative example. The squeezing roll 50E does not include an element corresponding to the blocking plate in this embodiment.

[0059] The liquid to be processed adheres to the outer circumferential surface 231 of the cylindrical portion 23 of the magnet drum 20. The adhered liquid flows to both ends of the cylindrical portion 23, and more liquid adheres to these ends than to other parts. In Figure 6, the region including the center of the cylindrical portion 23 in the first direction X is shown as region A1, and the regions at both ends where more liquid adheres than region A1 are shown as region A2. In Figure 6, region A2 is marked with a dot. These regions A1 and A2 are similarly formed on the outer circumferential surface 521 of the cylindrical portion 52 of the drawing roll 50.

[0060] Focusing on the throttling roll 50E, as the amount of liquid adhering to region A2 increases, the liquid flows from region A2 through the end faces 52a and 52b to the shaft 51, as shown by the arrows in Figure 6. The liquid that reaches the shaft 51 then flows along the shaft 51 to the throttling roll adjustment mechanisms 60A and 60B. The liquid then flows out of the tank section 10 along the side walls 12A and 12B via the bearings 61 and bearing cases 62 of the throttling roll adjustment mechanisms 60A and 60B.

[0061] Liquid that leaks out of the tank section 10 in this way can cause contamination around the magnetic separator. In particular, if the liquid is a highly viscous oil or contains a large amount of highly viscous oil, the liquid is likely to accumulate in area A2 and leak out of the tank section 10 via the shaft 51 from the end faces 52a and 52b.

[0062] In contrast, in this embodiment, the drawing roll 50 has damming plates 53A and 53B. The damming plates 53A and 53B are provided at a distance from the end faces 52a and 52b of the cylindrical portion 52, and a space SP1 in which liquid accumulates is formed between the damming plates 53A and 53B and the end faces 52a and 52b.

[0063] As a result, as shown by the arrows in Figure 3, when liquid flows to the shaft 51 via the end faces 52a and 52b, the liquid is blocked by the blocking plates 53A and 53B. Specifically, the surfaces 531 of the blocking plates 53A and 53B block the liquid. Since the liquid cannot reach beyond the blocking plates 53A and 53B, it accumulates in the space SP1. When a certain amount of liquid accumulates in the space SP1, it falls due to its own weight, and is discharged from the outlet 11a along with the liquid from which foreign matter has been separated and removed.

[0064] By providing the damming plates 53A and 53B at a distance from the end faces 52a and 52b, the liquid is less likely to flow directly from the end faces 52a and 52b to the outer surfaces of the damming plates 53A and 53B. This prevents the liquid from flowing over the damming plates 53A and 53B.

[0065] As in this embodiment, by providing the damming plates 53A and 53B on the squeezing roll 50, the outflow of liquid during the processing step can be suppressed. Even with highly viscous liquids that tend to accumulate at both ends of the cylindrical portion 52, the magnetic separator 100 can reliably suppress the outflow of the liquid to the outside.

[0066] Furthermore, if the damming plates 53A and 53B are placed too close to the side walls 12A and 12B of the tank section 10, the liquid falling from the damming plates 53A and 53B is more likely to adhere to the side walls 12A and 12B. In this embodiment, the distance D1 between the damming plates 53A and 53B and the end faces 52a and 52b is smaller than the distance D2 between the damming plates 53A and 53B and the side walls 12A and 12B of the tank section 10. By adjusting the distances D1 and D2 in this way, it is possible to further suppress the outflow of liquid from the tank section 10.

[0067] Furthermore, in this embodiment, the lower ends 533 of the damming plates 53A and 53B are located below the upper ends 121 of the side walls 12A and 12B of the tank section 10. Since the space SP1 also functions as a flow path for liquid, and the flow path is formed to extend below the side walls 12A and 12B, it is possible to further suppress the outflow of liquid to the outside of the tank section 10.

[0068] Furthermore, in this embodiment, the blocking plates 53A and 53B are fixed to the shaft 51 by a sealing material SB. As a result, compared to the case in which the blocking plates 53A and 53B are provided on the shaft 51 using an oil seal or the like, no other parts such as a case to house the oil seal are required, so there is no increase in the number of parts or assembly steps, and thus the assembly of the magnet separator 100 is not hindered. In addition, the blocking plates 53A and 53B can be easily attached later to the drawing roll 50 which does not have the blocking plates 53A and 53B.

[0069] Furthermore, in this embodiment, the retaining plates 53A and 53B are made of rubber material. This allows the inner diameter of the retaining plates 53A and 53B to be adjusted to be equivalent to the outer diameter of the shaft 51, compared to when they are made of metal material. This improves the ease of assembly of the retaining plates 53A and 53B.

[0070] With the magnet separator 100 configured as described above, the outflow of liquid to the outside via the shaft 51 of the squeezing roll 50 can be suppressed during the process of separating the magnetic material. In addition, various other desirable effects can be obtained from this embodiment.

[0071] Note that the damming structures applicable to the throttling roll 50 are not limited to the examples described above. Figures 7 and 8 show examples of damming structures applicable to the throttling roll 50. Here, examples of damming structures applicable to the throttling roll 50 are explained using a damming plate 53A, but the structures in Figures 7 and 8 can also be applied to a damming plate 53B.

[0072] In the example shown in Figure 7, multiple damming plates are provided between the cylindrical portion 52 of the drawing roll 50 and the side walls 12A and 12B of the tank portion 10. For example, damming plates 53A and 54A are provided between the end face 52a of the cylindrical portion 52 and the side wall 12A. This allows for the formation of an additional space SP2 between damming plates 53A and 54A. By forming this additional space SP2, even if liquid overflows damming plate 53A, the liquid will accumulate in space SP2, thereby suppressing liquid outflow.

[0073] Furthermore, by making the outer diameter of the outermost damming plate 54A larger than the outer diameter of damming plate 53A, the liquid becomes less likely to flow out. Note that the outer diameter of damming plate 54A may be smaller than or equal to the outer diameter of damming plate 53A. Although not shown, two damming plates are provided between the end face 52b of the cylindrical portion 52 and the side wall 12B. In the example in Figure 7, an example with two damming plates is disclosed, but three or more damming plates may be provided.

[0074] In the example shown in Figure 8, the damming plate 53A has an inclined surface 535. The inclined surface 535 on the damming plate 53A is inclined such that its thickness decreases towards the outer circumferential surface. Although not shown, the damming plate 53B also has an inclined surface 535 in a similar manner. By further forming the inclined surfaces 535 in this way, it becomes more difficult for the liquid to flow directly from the end faces 52a, 52b to the outer circumferential surfaces of the damming plates 53A, 53B, thus making it easier to suppress the outflow of liquid to the outside.

[0075] In implementing the above embodiments, the specific configurations of each element constituting the magnetic separator, including specific configurations such as the drawing roll, can be changed in various ways. Various embodiments can be formed by appropriately combining the multiple components disclosed in the above embodiments. For example, some components may be removed from all the components shown in the embodiments, or different components may be appropriately combined.

[0076] An example of a magnetic separator obtained from the configuration disclosed herein is shown below. [1] A tank section into which a liquid containing a magnetic material is poured, A magnet drum is provided in the tank section for attracting the magnetic material, A squeezing roll is provided above the magnetic drum to squeeze the liquid adhering to the magnetic material, The tank section is provided with a drive unit that rotates the magnet drum and the squeezing roll, The aforementioned diaphragm roll is The shaft and A cylindrical portion connected to the shaft, including a first end face and a second end face located opposite the first end face, A first blocking plate is provided on the shaft at a distance from the first end face, A second blocking plate is provided on the shaft at a distance from the second end face, It has, The first damming plate and the second damming plate are located inside the tank section. Magnetic separator. [2] The squeezing roll defines spaces for the liquid to accumulate between the first damming plate and the first end face, and between the second damming plate and the second end face, [1] The magnetic separator described above. [3] The first gap between the first damming plate and the first end face is smaller than the second gap between the first damming plate and the side wall of the tank section. The magnetic separator described in [1] or [2]. [4] The lower end of the first damming plate is located below the upper end of the side wall of the tank section. A magnetic separator as described in any one of [1] to [3]. [5] The first and second damming plates are made of rubber material. A magnetic separator as described in any one of [1] through [4]. [6] The tank section is further provided with a first aperture roll adjustment mechanism and a second aperture roll adjustment mechanism for adjusting the distance between the magnet drum and the aperture roll, The first aperture roll adjustment mechanism and the second aperture roll adjustment mechanism rotatably support the shaft, The first damming plate is provided between the first end face and the first throttling roll adjustment mechanism, The second damming plate is provided between the second end face and the second throttling roll adjustment mechanism. A magnetic separator as described in any one of [1] to [5]. [Explanation of symbols]

[0077] 10...Tank section, 12A,12B...Side walls, 20...Magnet drum, 21...Shaft, 22,23...Cylindrical section, 24...Magnet, 25...Shaft, 30...Drive unit, 41...Scraper plate, 50...Squeezing roll, 51...Shaft, 52...Cylindrical section, 52a,52b...End faces, 53A,53B...Stopping plates, 60A,60B...Squeezing roll adjustment mechanism, 70...Transmission mechanism, 100...Magnet separator, 121...Upper end, 533...Lower end, SP1,SP2...Space.

Claims

1. A tank section into which a liquid containing a magnetic material is poured, A magnet drum is provided in the tank section for attracting the magnetic material, A squeezing roll is provided above the magnetic drum to squeeze the liquid adhering to the magnetic material, The tank section is provided with a drive unit that rotates the magnet drum and the squeezing roll, The aforementioned diaphragm roll is The shaft and A cylindrical portion connected to the shaft, including a first end face and a second end face located opposite the first end face, A first blocking plate is provided on the shaft at a distance from the first end face, A second blocking plate is provided on the shaft at a distance from the second end face, It has, The first damming plate and the second damming plate are located inside the tank section. Magnetic separator.

2. The squeezing roll defines spaces for the liquid to accumulate between the first damming plate and the first end face, and between the second damming plate and the second end face, The magnetic separator according to claim 1.

3. The first gap between the first damming plate and the first end face is smaller than the second gap between the first damming plate and the side wall of the tank section. The magnetic separator according to claim 2.

4. The lower end of the first damming plate is located below the upper end of the side wall of the tank section. The magnetic separator according to claim 2.

5. The first and second damming plates are made of rubber material. The magnetic separator according to claim 1.

6. The tank section is further provided with a first aperture roll adjustment mechanism and a second aperture roll adjustment mechanism for adjusting the distance between the magnet drum and the aperture roll, The first aperture roll adjustment mechanism and the second aperture roll adjustment mechanism rotatably support the shaft, The first damming plate is provided between the first end face and the first throttling roll adjustment mechanism, The second damming plate is provided between the second end face and the second throttling roll adjustment mechanism. A magnetic separator according to any one of claims 1 to 5.

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