Magnetic sludge recovery device

Abstract

To efficiently recover sticky magnetic sludge. [Solution] The magnetic sludge recovery device (1) comprises a drive sprocket (11) as a rotating drive body, a driven sprocket (12) as a guide member, a conveying member (13), a drive unit (14) that drives the drive sprocket, a plurality of magnetic members (15) attached to the conveying member and moving, a sludge carrier (20) that does not have magnetism and holds magnetic sludge with the magnetic force of the magnetic members, a discharge unit (28) that discharges by its own weight, and a magnetic cover (30) as a magnetic cover member that covers the surface side of the sludge carrier at a predetermined interval upstream of the discharge unit in the direction of movement.

Description

Technical Field

[0001] The present invention relates to a magnetic sludge recovery device for recovering magnetic sludge mixed in a processing fluid, a coolant fluid, etc.

Background Art

[0002] Magnetic sludge composed of machining chips of a workpiece is mixed in the machining fluid of a processing machine or the coolant fluid of a machine tool. Therefore, the removal and recovery of magnetic sludge from the machining fluid or the coolant fluid are carried out. In this specification, a liquid that undergoes a process of removing magnetic sludge such as a machining fluid or a coolant fluid is referred to as a liquid to be treated.

[0003] Patent Document 1 discloses a component alignment device that is considered applicable to the recovery of such magnetic sludge. The component alignment device is a device for aligning components formed of a magnetic material.

[0004] In this device, an endless belt that runs over a pair of pulleys is arranged on the back side of a component alignment plate formed of a non-magnetic material. Magnets are arranged on the surface of the endless belt at predetermined intervals, and components formed of a magnetic material are attracted to the surface of the component alignment plate by the magnetic force of the magnets. When the endless belt runs, the components attracted to the surface of the component alignment plate are aligned and move and are conveyed in the running direction of the endless belt as the magnets move.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, even using the conventional techniques described above without any modifications, it is not possible to efficiently recover magnetic sludge. This is because the stickiness of magnetic sludge is not taken into consideration. Magnetic sludge may have oils attached to it, such as rust-preventive oil from the surface of the workpiece or lubricating oil from the sliding surfaces of the processing machine body, and such magnetic sludge is sticky. The stickiness of magnetic sludge is not determined uniformly but varies depending on the type and amount of oil attached.

[0007] In the case of adhesive magnetic sludge, it adheres to the support surface (conveying surface) of the component made of non-magnetic material, which corresponds to the component alignment plate, making it difficult to move with the magnet. As a result, stagnation occurs, and once a certain amount of magnetic sludge accumulates, it will not move at all even when the magnet moves, and conveyance will cease.

[0008] One aspect of the present invention aims to realize a magnetic sludge recovery device that efficiently recovers sticky magnetic sludge. [Means for solving the problem]

[0009] To solve the above problems, a magnetic sludge recovery device according to embodiment 1 of the present invention is a magnetic sludge recovery device that recovers magnetic sludge mixed in a liquid to be treated by immersing its lower side in the liquid to be treated, comprising: a rotating drive body disposed on one of the upper and lower sides and a guide member disposed on the other of the upper and lower sides; a conveying member that is stretched between the rotating drive body and the guide member and travels; a drive unit that drives the rotating drive body; a magnet member attached to the conveying member and moving, wherein a plurality of magnet members are arranged at intervals from each other in the direction of movement of the conveying member; a sludge carrier that has no magnetism and is arranged so that its back surface is along the magnet member and carries the magnetic sludge on its surface by the magnetic force of the magnet member; a discharge unit that guides the magnetic sludge carried in contact with the conveying surface formed on the surface of the sludge carrier toward away from the magnet member and discharges it by its own weight; and a magnetic cover member that covers the conveying surface at a predetermined distance upstream of the discharge unit in the direction of movement.

[0010] In the magnetic sludge recovery device according to embodiment 2 of the present invention, in embodiment 1, the sludge carrier has an arc-shaped portion that changes the transport direction of the magnetic sludge from upward to downward, the discharge portion is located downstream of the arc-shaped portion in the direction of movement, and the cover member may be provided so as to cover the arc-shaped portion.

[0011] A magnetic sludge recovery device according to embodiment 3 of the present invention, in embodiment 1 or 2, further comprises a pair of magnetic rails provided in a lateral direction intersecting the direction of movement and guiding the movement of the pair of conveying members, and the cover member comprises a cover body arranged to face the conveying surface and legs extending toward the conveying surface from both ends of the cover body in the lateral direction and in contact with the conveying surface, and the pair of rails and the legs at both ends may overlap with the sludge carrier in between.

[0012] In the magnetic sludge recovery device according to embodiment 4 of the present invention, in embodiment 3, the cover body may include an upper cover portion that covers the arc-shaped portion and a hanging cover portion connected to the upstream end of the upper cover portion in the direction of movement. In the magnetic sludge recovery device according to embodiment 5 of the present invention, in embodiment 3, the magnetic member is formed in a shape that is elongated in the lateral direction and has a magnet and a yoke member, the yoke member is located on the opposite side of the magnet from the sludge carrier, the magnetic member is arranged between the pair of conveying members, and both ends of the yoke member in the lateral direction may be connected to the pair of conveying members.

[0013] In the magnetic sludge recovery apparatus according to embodiment 5 of the present invention, in embodiment 1 or 2, the spacing between the plurality of magnetic members in the direction of movement may be wider in some parts than in other parts. [Effects of the Invention]

[0014] According to one aspect of the present invention, a magnetic sludge recovery device capable of efficiently recovering magnetic sludge having adhesiveness can be realized.

Brief Description of the Drawings

[0015] [Figure 1] It is a perspective view of the discharge side of the magnetic sludge recovery device in one embodiment of the present invention. [Figure 2] It is a perspective view of the intake side of the magnetic sludge recovery device. [Figure 3] It is a side cross-sectional view of the magnetic sludge recovery device. [Figure 4] It is a cross-sectional view showing the configuration of the upper part of the magnetic sludge recovery device. [Figure 5] It is an explanatory diagram showing the arrangement of the magnet member and the magnets provided in the magnetic sludge recovery device. [Figure 6] It is an exploded perspective view showing the configuration of the magnet member. [Figure 7] It is an explanatory diagram showing the recovery operation of magnetic sludge in the magnetic sludge recovery device. [Figure 8] It is an explanatory diagram showing the difference in the conveyance state of magnetic sludge when all the intervals in the moving direction of the magnet member are the first interval and when a second interval is provided partially. [Figure 9] It is an explanatory diagram schematically showing the path of magnetic flux when there is a magnetic cover in the magnetic sludge recovery device. [Figure 10] It is an explanatory diagram schematically showing the path of magnetic flux when there is no magnetic cover.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, one embodiment of the present invention will be described in detail.

[0017] FIG. 1 is a perspective view of the discharge side of the magnetic sludge recovery device 1 according to an embodiment of the present invention. In FIG. 1, a state where the magnetic cover 30 is moved upward is shown. FIG. 2 is a perspective view of the intake side of the magnetic sludge recovery device 1. In FIG. 2, a state excluding the flat plate-shaped portion 203 of the magnetic cover 30 and the sludge carrier 20 is shown. FIG. 3 is a side sectional view of the magnetic sludge recovery device 1. FIG. 4 is a sectional view showing the upper configuration of the magnetic sludge recovery device 1. FIG. 5 is an explanatory view showing the arrangement of the magnet members 15 and the magnets 16 provided in the magnetic sludge recovery device 1.

[0018] The magnetic sludge recovery device 1 is used to recover magnetic sludge from a processing liquid such as grinding oil used in various grinding devices or aqueous or oily processing liquids used in processing devices.

[0019] As shown in FIGS. 1 to 3, the magnetic sludge recovery device 1 includes a drive sprocket 11 as a rotary drive body, a driven sprocket 12 as a guide member, a drive unit 14, a conveying member 13, a plurality of magnet members 15, a sludge carrier 20, a discharge unit 28, and a magnetic cover 30.

[0020] (Moving mechanism of the magnet member) The drive sprocket 11 and the driven sprocket 12 are provided between a pair of frames 2a and 2b (see FIGS. 1 and 2). In FIG. 3, the drive sprocket 11 as a rotary drive body is located above, and the driven sprocket 12 as a guide member is located below. However, it is sufficient that the rotary drive body is arranged on one of the upper and lower sides and the guide member is arranged on the other of the upper and lower sides.

[0021] Furthermore, although this embodiment illustrates a configuration in which the rotary drive unit and guide member consist of a sprocket, it is not limited to this. The rotary drive unit may be a pulley or the like that is rotationally driven by power from the drive unit 14, as long as it can wrap around the conveying member 13. The guide member may also be a driven-rotating pulley or the like. In addition, the guide member may be any member that guides the conveying member 13 so that it can travel in an annular manner together with the rotary drive unit, and its shape is free, such as circular or crescent-shaped, and it may be rotatable or non-rotatable.

[0022] As shown in Figures 2 and 3, the conveying member 13 is a flexible power transmission member such as a belt or chain that is stretched over the drive sprocket 11 and the driven sprocket 12 and travels. In this embodiment, a pair of conveying members 13 are provided in the lateral direction intersecting the direction of movement of the conveying member 13. The lateral direction intersecting the direction of movement refers to the left and right directions when the magnetic sludge recovery device 1 is viewed from the front side, either from the intake side or the discharge side. Furthermore, in this embodiment, a pair of endless traveling chains 13a and 13b having magnetism such as metal (ferromagnetic material) are used as the pair of conveying members 13.

[0023] As shown in Figures 3 and 4, a pair of rails 3a and 3b are provided on a pair of frames 2a and 2b to guide the movement of a pair of endless running chains 13a and 13b. The pair of rails 3a and 3b include a magnetic material such as metal (ferromagnetic material). The pair of rails 3a and 3b abut against the sludge carrier 20 and slide against the endless running chains 13a and 13b. As shown in Figure 3, in this embodiment, the pair of rails 3a and 3b are provided to guide the outer circumference of the pair of endless running chains 13a and 13b, except for the portion in which the tensioner 19 makes contact. Note that the pair of rails 3a and 3b only need to be provided in a region facing the magnetic material cover 30, and at least the region facing the magnetic material cover 30 needs to be made of a magnetic material.

[0024] Returning to Figures 1 and 2, the drive unit 14 drives the drive sprocket 11, and in the example shown in the figure, the drive unit 14 is fixed to the frame 2a. In this embodiment, the drive unit 14 changes the travel speed of the endless travel chains 13a and 13b by switching the rotational speed of the drive sprocket 11. In other words, the travel speed of the endless travel chains 13a and 13b is variable.

[0025] (Magnetic component) As shown in Figure 2, the magnetic member 15 has a shape that is elongated in the lateral direction (longer in the lateral direction than in the vertical direction) intersecting the direction of movement of the conveying member 13, and is attached to the conveying member 13 and moves. Specifically, the magnetic member 15 is attached to a pair of endless running chains 13a and 13b and is positioned between the pair of endless running chains 13a and 13b. The direction of movement of the conveying member 13 is also the direction of movement of the magnetic member 15, and will hereafter be simply referred to as the direction of movement.

[0026] As shown in Figures 2 and 3, the magnetic member 15 has a magnet 16 and a yoke member 17. In this embodiment, the yoke member 17 is located on the opposite side of the magnet 16 from the sludge carrier 20, and both lateral ends of the yoke member 17 are connected to a pair of endless running chains 13a and 13b.

[0027] Furthermore, the multiple magnetic members 15 are arranged with a gap between them in the direction of movement. When the multiple magnetic members 15 are attached to the endless travel chains 13a and 13b, the gap between them in the direction of movement is wider in some parts than in others.

[0028] Specifically, in this embodiment, as shown in Figure 5, the multiple magnet members 15 are arranged at equal intervals with a first interval W1 between them in the direction of movement, and in some cases, a second interval W2 larger than the first interval W1 is left between them. By arranging the multiple magnet members 15 with a first interval W1 between them, and providing a second interval W2 larger than the first interval W1 in some areas, the adhesive magnetic sludge can be transported by following the movement of the magnet members 15 and efficiently recovered. This will be explained later.

[0029] Furthermore, in this embodiment, a pair of endless traveling chains 13a and 13b are used as the conveying members 13. Therefore, the first interval W1 and the second interval W2 can be easily set in accordance with the pitch of the chain links, making assembly easy.

[0030] Furthermore, as shown in Figure 5, in this embodiment, multiple magnets 16 are provided in one magnetic member 15, and the multiple magnets 16 are arranged side by side in the lateral direction with a gap between them. The multiple magnets 16 are arranged such that the polarity of adjacent magnets 16 in the lateral direction is opposite. Moreover, the multiple magnets 16 are arranged such that the polarity of adjacent magnets 16 in the direction of movement, separated by a first interval W1, that is, the polarity of adjacent magnets 16 in the direction of movement, provided in each of two magnetic members 15 separated by a first interval W1, is opposite.

[0031] In Figure 5, the difference in polarity of the magnets 16 facing the back surface 20a of the sludge carrier 20, which will be described later, is shown by varying shades of gray. If the white areas represent the south pole, then the areas with dots represent the north pole. By arranging the magnets 16 in this way, a strong magnetic force can be generated on the transport surface 20b of the sludge carrier 20, which will be described later, and more magnetic sludge S (see Figure 7) can be attracted to the transport surface 20b.

[0032] Note that the arrangement of magnets 16 shown in Figure 5 is a preferred example and is not limited to this arrangement. For example, all magnets 16 may be arranged so that they are all facing either the north or south pole toward the back surface 20a of the sludge carrier 20. Alternatively, they may be arranged so that only one of the magnets 16 adjacent to each other in the lateral direction, or one of the magnets 16 adjacent to each other in the direction of movement, are opposite in polarity.

[0033] Figure 6 is an exploded perspective view showing the configuration of the magnetic member 15. As shown in Figure 6, in this embodiment, the magnetic member 15 includes a non-magnetic case 41 that houses the magnets 16. The case 41 has an opening 41a on its bottom side, and the magnets 16 are housed inside through the opening 41a. Non-magnetic spacers 42 are placed between the magnets 16. The yoke member 17 also serves as a lid that opens and closes the opening 41a of the case 41. Magnetic connecting parts 43, such as metal (ferromagnetic material), are provided at both ends of the case 41 in the longitudinal direction.

[0034] As shown in Figures 4 and 5, the magnetic member 15 is attached to a pair of endless running chains 13a and 13b using a connecting component 43. The yoke member 17 and the pair of endless running chains 13a and 13b are connected via the connecting component 43, thereby creating a path (magnetic path) for the magnetic flux emitted from the magnet 16 between the magnetic member 15 and the endless running chains 13a and 13b. This will also be described later.

[0035] (Sludge carrier) Returning to Figures 1 to 3, the sludge carrier 20 is non-magnetic and is positioned so that its back surface 20a aligns with the magnetic member 15. The sludge carrier 20 carries magnetic sludge S (see Figure 7) on its surface, the transport surface 20b, by the magnetic force of the magnetic member 15 (magnet 16). The sludge carrier 20 is located between a pair of frames 2a and 2b and is supported and fixed by the pair of frames 2a and 2b.

[0036] As shown in Figure 3, the sludge carrier 20 consists of a thin plate member made of a non-magnetic material and is positioned to cover the outside of the magnetic members 15 that are attached to and move on the endless traveling chains 13a and 13b. The sludge carrier 20 is positioned so that, at least in the region from the lower part of the intake side to the discharge section 28, the back surface 20a of the sludge carrier 20 and the outer surface 15a of the magnetic members 15 can come into contact or be in close proximity.

[0037] The magnetic sludge S is attracted to and supported on the transport surface 20b formed on the surface of the sludge carrier 20 by the magnetic force of the magnetic member 15, and is transported on the transport surface 20b as the magnetic member 15 moves.

[0038] Specifically, in this embodiment, the sludge carrier 20 has arc-shaped portions 201 and 202 and flat plate-shaped portions 203 and 204. The upper arc-shaped portion 201 is the part that changes the transport direction of the magnetic sludge S from upward to downward, and is the part that makes a U-turn in the transport direction. In this embodiment, the arc-shaped portion 201 has an arc shape that follows the outer shape of the drive sprocket 11. The lower arc-shaped portion 202 has an arc shape that follows the outer shape of the driven sprocket 12.

[0039] The flat plate-shaped section 203 on the intake side is connected to the upper and lower arc-shaped sections 201 and 202, and the flat plate-shaped section 204 on the discharge side is connected to the lower arc-shaped section 202. Here, in the flat plate-shaped section 204 on the discharge side, the back surface 20a and the outer surface 15a of the magnetic member 15 should be positioned so that they can contact or be close to each other at the bottom.

[0040] In this embodiment, the arc-shaped portions 201 and 202 and the flat plate-shaped portions 203 and 204 are formed by bending a single thin plate, and the conveying surface 20b is flush with the surface. The sludge carrier 20 may also have a hanging portion 205 (see Figure 7) that hangs down from the discharge end of the arc-shaped portion 201. In that case, the arc-shaped portions 201 and 202, the flat plate-shaped portions 203 and 204, and the hanging portion 205 may all be formed by bending a single thin plate.

[0041] The material forming the sludge carrier 20 can be any non-magnetic material, such as stainless steel or resin. The conveying surface 20b is preferably low friction so that the magnetic sludge S, which is attracted to and supported by the magnetic member 15, follows the movement of the magnetic member 15. Alternatively, the conveying surface 20b may be a surface that repels oil, making it difficult for the adhesive magnetic sludge to adhere.

[0042] As shown in Figures 2 and 3, the discharge section 28 contacts the transport surface 20b of the sludge carrier 20, guiding the supported magnetic sludge S away from the magnetic member 15 and discharging it by its own weight (the weight of the magnetic sludge).

[0043] (Discharge section) In this embodiment, the discharge section 28 is located downstream in the direction of movement from the upper arc-shaped section 201 of the sludge carrier 20. Specifically, the discharge section 28 is composed of an inclined guide section 29 that slopes away from the magnetic member 15 as it moves downward.

[0044] As shown in Figure 3, the inclined guide portion 29 extends from the discharge-side end of the arc-shaped portion 201 above the sludge carrier 20 in the tangential direction of the arc of the arc-shaped portion 201. The magnetic sludge S guided from the arc-shaped portion 201 to the inclined guide portion 29 loses its magnetic influence as it moves away from the magnetic member 15, and slides down the surface of the inclined guide portion 29 by its own weight.

[0045] Furthermore, if the sludge carrier 20 has a hanging portion 205 (see Figure 7), the inclined guide portion 29 extends from the lower end of the hanging portion 205. In this case, the magnetic sludge S is guided to the inclined guide portion 29 via the hanging portion 205.

[0046] Such an inclined guide section 29 can be easily constructed, for example, by providing an inclined extension 201a at the discharge end of the arc-shaped section 201, as shown in Figure 3, and attaching another plate material with a portion of it overlapping this extension 201a.

[0047] (Magnetic cover) As shown in Figures 1 and 3, the magnetic cover 30 is a magnetic cover member that covers the surface side of the sludge carrier 20 at a predetermined distance upstream of the discharge section 28 in the direction of movement. By providing the magnetic cover 30, the adhesive magnetic sludge S can be efficiently transported by following the movement of the magnetic member 15, and consequently, can be efficiently recovered. This will also be described later.

[0048] The distance between the magnetic cover 30 and the surface side of the sludge carrier 20 is set to a distance that enhances the magnetic sludge S adsorption effect of the magnetic member 15, and at a distance that prevents the transported magnetic sludge S from adhering to the magnetic cover 30.

[0049] As shown in Figures 1 and 3, in this embodiment, the magnetic material cover 30 has a cover body 32 positioned facing the transport surface 20b and legs 31. The cover body 32 only needs to cover at least a portion of the transport surface 20b, but it is preferable that it is provided to cover the upper arc-shaped portion 201 of the transport surface 20b. In other words, it is preferable that it is provided to cover the upper arc-shaped portion 201.

[0050] In this embodiment, the cover body 32 has an arc-shaped enclosing portion (upper cover portion) 32a that covers the conveying surface 20b of the upper arc-shaped portion 201, and a flat plate-shaped hanging portion (hanging cover portion) 32b that covers the linear conveying surface 20b on the intake side.

[0051] As shown in Figures 1, 3, and 4, the leg portion 31 has leg portions 31a and 31b formed at both lateral ends of the cover body 32. The leg portions 31a and 31b extend toward the sludge carrier 20 and are in contact with the conveying surface 20b.

[0052] The magnetic cover 30 is arranged such that the legs 31a, 31b and the pair of rails 3a, 3b provided on the pair of frames 2a, 2b overlap the sludge carrier 20 (arc-shaped portion 201). This makes it possible to transport the adhesive magnetic sludge S more efficiently by allowing it to follow the movement of the magnetic member 15. This will also be described later.

[0053] (Recovery of magnetic sludge) Figure 7 is an explanatory diagram showing the magnetic sludge S recovery operation in the magnetic sludge recovery device 1. As shown in Figure 7, the magnetic sludge recovery device 1 recovers the magnetic sludge S mixed in the liquid to be treated by immersing its lower side in the flow of the liquid to be treated 60. Note that the liquid to be treated 60 may not be flowing. In the magnetic sludge recovery device 1, the space inside the sludge carrier 20 where the drive sprocket 11, driven sprocket 12, transport member 13, magnetic member 15, etc. are arranged is watertight.

[0054] As shown in Figure 7, the magnetic sludge S contained in the liquid to be treated 60 is attracted to and carried on the transport surface 20b of the sludge carrier 20 by the magnetic force of the magnetic member 15 located on the back surface 20a side of the sludge carrier 20. When the transport member 13 moves in the direction of travel (arrow B) and the magnetic member 15 moves, the attracted magnetic sludge S also moves along the transport surface 20b and is transported. When the magnetic sludge S reaches the inclined guide section 29, it is released from the magnetic force of the magnetic member 15 and falls along the inclined guide section 29 by its own weight and is discharged to the outside.

[0055] In the case of non-adhesive magnetic sludge S, it is discharged sequentially as it reaches the inclined guide section 29. In contrast, in the case of adhesive magnetic sludge S, it adheres to the transport surface 20b not only by the magnetic force from the magnetic member 15 but also by its own adhesiveness, making it difficult to follow the movement of the magnetic member 15.

[0056] Therefore, in the magnetic sludge recovery device 1, first, multiple magnetic members 15 are arranged with a first interval W1 between them in the direction of movement. By ensuring this first interval W1, even if the magnetic sludge S is adhering to the transport surface 20b, it is possible to avoid being attracted to the next moving magnetic member 15 and to transport the magnetic sludge S with each magnetic member 15.

[0057] Therefore, although it depends on the magnetic force of the magnet 16 of the magnetic member 15, the adhesiveness of the magnetic sludge S, and the moving speed of the transport member 13, the first interval W1 needs to be such that the magnetic sludge S that has been attracted by itself is not attracted to the next moving magnetic member 15 and remains there.

[0058] However, even if the first interval W1 is maintained, some of the magnetic sludge S that should be discharged and reach the inclined guide section 29 may move back due to the influence of the next magnetic member 15. In that case, the magnetic sludge S will accumulate near the boundary between the inclined guide section 29 and the transport surface 20b. If such accumulation occurs repeatedly, the magnetic sludge S will eventually stop being transported, as will be described later.

[0059] Therefore, in the magnetic sludge recovery device 1, the distance between components in the direction of movement is set to a second interval W2 which is larger than the first interval W1 in some areas. By providing a second interval W2 which is larger than the first interval W1 in this way, as will be described later, the sludge may temporarily accumulate but is discharged as appropriate, and as a result, the magnetic sludge S can be continuously transported.

[0060] Depending on the magnetic force of the magnet 16 on the magnetic member 15, the adhesiveness of the magnetic sludge S, and the moving speed of the transport member 13, the second interval W2 must be such that the magnetic sludge S located furthest downstream of the boundary is not attracted to the next moving magnetic member 15 and remains there.

[0061] In this embodiment, the second interval W2 is set to a distance at which the magnetic forces of the magnets 16 do not affect each other at all between two adjacent magnetic members 15 in the direction of movement. The magnetic force referred to here is simply large enough to attract the magnetic sludge S to the transport surface 20b.

[0062] Furthermore, as shown in Figure 5, in this embodiment, the polarity of the multiple magnets 16 in the two adjacent magnetic members 15 in the second interval W2 is arranged to create a repulsive force between them. With this arrangement, even if the second interval W2 is narrow relative to the magnetic force of the magnets 16, the repulsive force is expected to make it easier for the accumulated magnetic sludge S to be discharged when passing through the second interval W2. In addition, since the magnetic circuit is broken (not formed) between the second interval W2, it is possible to prevent the magnetic sludge S from attracting each other.

[0063] Next, Figure 8 will be used to schematically explain the difference in the transportability of magnetic sludge S with and without the second interval W2. Figure 8 is an explanatory diagram showing the difference in the transport state of magnetic sludge S when the entire spacing in the direction of movement of the magnetic member 15 is the first interval W1 and when a second interval W2 is provided in part. In Figure 8, the dashed line L2 indicates the boundary between the inclined guide section 29 and the transport surface 20b.

[0064] As shown in Figures 8(1) to (4), the magnetic sludge S, even though it is sticky, is attracted to each magnetic member 15 by the first interval W1 and transported along the transport surface 20b. As shown in Figure 8(2), the magnetic sludge S transported by the magnetic member 15-1 moves from the transport surface 20b to the inclined guide section 29 and slides down due to its own weight.

[0065] However, because it is sticky, its movement is slow. Therefore, as shown in Figure 8 (3), some of the magnetic sludge S that has moved to the inclined guide section 29 may be attracted back to the magnetic member 15-2 due to the influence of the magnetic member 15-2 that has reached the front of the inclined guide section 29.

[0066] In such a case, as shown in Figure 8 (4), when the next magnetic member 15-3 reaches the front of the inclined guide portion 29, a portion of the magnetic sludge S that has moved to the inclined guide portion 29 is further affected by the magnetic member 15-3.

[0067] If the states in (2) to (4) of Figure 8 are repeated, the magnetic sludge S will continue to be affected by magnetic attraction as it is successively approached by the magnetic members 15, as shown in (5) of Figure 8, and may accumulate near the boundary.

[0068] If the spacing between all the magnetic members 15 is set to the first spacing W1, the magnetic members 15 reach the target one after another without interruption. As a result, as shown in Figure 8(9), the magnetic sludge S eventually adheres to the surface, spreading out and extending upstream in the transport direction, starting near the boundary between the inclined guide section 29 and the transport surface 20b. When this state occurs, the magnetic sludge S is no longer transported.

[0069] In contrast, when a second gap W2 is provided in part of the spacing between the magnetic members 15, as shown in Figures 8(6) and (7), the magnetic force does not affect the accumulated magnetic sludge S while the portion of the second gap W2 is passing through the area where the magnetic sludge S near the boundary is accumulated. Therefore, as shown in Figures 8(7) and (8), the accumulated magnetic sludge S slides down the inclined guide portion 29 by its own weight and is discharged. This returns the system to state (2).

[0070] In this way, by providing a second interval W2 in a part of the structure, although magnetic sludge S may temporarily accumulate near the boundary, the accumulated magnetic sludge S can be discharged in batches periodically, thereby allowing the magnetic sludge S to be continuously transported.

[0071] (Effect of magnetic cover) Next, the operation of the magnetic cover 30 in the magnetic sludge recovery apparatus 1 will be explained using Figures 9 and 10. Figure 9 is a schematic diagram illustrating the path of magnetic flux when the magnetic cover 30 is present. Figure 10 is a schematic diagram illustrating the path of magnetic flux when the magnetic cover 30 is absent.

[0072] As shown in Figure 10, in the absence of the magnetic cover 30, the magnetic flux emanating from the multiple magnets 16 arranged horizontally passes through the yoke member 17 to the adjacent magnet 16, as indicated by arrow 51, and returns through the air. Of this, a portion of the magnetic flux emanating from the magnets 16 at the horizontal ends where there is no adjacent magnet 16 passes through the yoke member 17, connecting part 43, endless running chain 13a (13b), rail 3a (3b), and the air in that order before returning. Thus, in the absence of the magnetic cover 30, the magnetic flux emanating from the multiple magnets 16 travels a long (wide) distance through the air, which has high magnetic resistance, thus weakening the magnetic force.

[0073] In contrast, as shown in Figure 9, when a magnetic cover 30 is provided, the cover body 32 covers the transport surface 20b opposite to it. Therefore, the magnetic flux emanating from the multiple magnets 16 arranged in the horizontal direction passes through the yoke member 17 to the adjacent magnet 16, as shown by the arrow 50, and returns to the magnet 16 through the cover body 32, which is positioned opposite the yoke member 17. A portion of the magnetic flux emanating from the magnets 16 at the horizontal ends where there are no adjacent magnets 16 passes through the yoke member 17, connecting parts 43, endless running chain 13a (13b), rails 3a (3b), sludge carrier 20, and magnetic legs 31a made of metal (ferromagnetic material) in order, before returning to the magnet 16 through the cover body 32.

[0074] In this case, although there is a section of air between the cover body 32 and the magnet 16, the distance traveled through the air can be drastically reduced compared to the case without the magnetic cover 30. Therefore, the magnetic force is less likely to weaken, and magnetic sludge S can be effectively attracted and held on the transport surface 20b. In other words, the magnetic cover 30 functions as a yoke that sandwiches the magnet 16 between the yoke member 17.

[0075] This strengthens the magnetic member 15's ability to attract and transport magnetic sludge S, allowing the adhesive magnetic sludge to be efficiently transported by following the movement of the magnetic member 15, and ultimately enabling efficient recovery.

[0076] It is preferable to provide such a cover body 32 in areas where the magnetic sludge S has difficulty following the movement of the magnetic member 15, and in areas where the magnetic sludge S adsorbed on the transport surface 20b is likely to slide off.

[0077] In this embodiment, as described above, the cover body 32 has an arc-shaped enclosing portion 32a and a hanging portion 32b connected to the arc-shaped enclosing portion 32a. The arc-shaped enclosing portion 32a covers the arc-shaped conveying surface 20b of the arc-shaped portion 201 of the sludge carrier 20. The hanging portion 32b covers the linear conveying surface 20b of the flat plate-shaped portion 203 on the intake side and has a flat plate shape.

[0078] The arc-shaped transport surface 20b of the upper arc-shaped section 201 changes the transport direction of the magnetic sludge S from upward to downward, making it difficult for the magnetic sludge S to follow the movement of the magnetic member 15. By providing the arc-shaped surrounding section 32a, the attraction force of this section is increased, making it possible for the magnetic sludge S to be transported in accordance with the movement of the magnetic member 15.

[0079] Furthermore, the portion from the flat plate-shaped section 203 on the intake side to the upper arc-shaped section 201 is where the conveying surface 20b changes from a straight line to an arc shape. Therefore, the magnetic sludge S being conveyed on the straight conveying surface 20b of the flat plate-shaped section 203 on the intake side is prone to sliding off. By providing the hanging portion 32b, the adsorption force in this portion can be increased, thereby suppressing the sliding off of the magnetic sludge S.

[0080] The length of the hanging portion 32b, that is, the length from the end of the arc-shaped enclosing portion 32a on the intake side to the lower end 32b1 of the hanging portion 32b, is preferably at least the first interval W1. The attractive force is weak in the area between the magnetic members 15 where there is no magnet 16, and therefore sliding is particularly likely to occur. By providing the hanging portion 32b at a length of at least the first interval W1, the magnetic force in this weak magnetic area can be strengthened by the magnetic material cover 30, and the sliding of the magnetic material sludge S can be suppressed even more effectively.

[0081] Furthermore, in Figure 3, the dashed line segment L1 indicates the liquid level of the liquid to be treated 60 (see Figure 7). The magnetic cover 30 may be configured such that the distance between the lower end 32b1 of the hanging portion 32b and the liquid level of the liquid to be treated 60 is less than the first interval W1.

[0082] With this configuration, the liquid surface of the liquid to be processed 60 passes over the portion between the magnetic members 15 where there are no magnets 16, and the hanging portion 32b is located opposite this portion where there are no magnets 16. As a result, the magnetic force in this weak magnetic field can be strengthened by the magnetic cover 30, and the magnetic sludge S can be effectively supported and transported even in this weak magnetic field.

[0083] Furthermore, as explained with reference to Figure 4, the magnetic cover 30 has legs 31a and 31b provided at the lateral ends of the cover body 32, and these legs 31a and 31b are arranged to overlap the pair of rails 3a and 3b with the sludge carrier 20 (arc-shaped portion 201). Preferably, the legs 31a and 31b are provided over the entire area of ​​both lateral ends of the cover body 32, that is, on both the arc-shaped surrounding portion 32a and the hanging portion 32b.

[0084] With these legs 31a and 31b provided, the only area with high magnetic resistance between the rails 3a and 3b and the cover body 32 is the sludge carrier 20. This makes it possible to transport the adhesive magnetic sludge S more efficiently by allowing it to follow the movement of the magnetic member 15.

[0085] In this embodiment, we have illustrated a magnetic sludge recovery device 1 that includes both a configuration in which the spacing of the magnetic members 15 in the direction of movement is partially wider than the first spacing (second spacing W2), and a configuration that includes a magnetic cover 30. However, the effects of each configuration can be obtained independently.

[0086] By using a configuration with a second interval W2 that is wider than the first interval, the magnetic sludge S that accumulates in front of the inclined guide section 29 can be periodically dropped, allowing the magnetic sludge S to be continuously transported. Furthermore, by including a magnetic cover 30, the force with which the magnetic member 15 attracts and transports the magnetic sludge S can be strengthened. By combining both configurations, a synergistic effect can be expected, allowing for even more efficient recovery.

[0087] Incidentally, as mentioned above, in the case of adhesive magnetic sludge S, the force resisting the movement of the magnetic member 15 differs depending on its adhesive strength. Therefore, the higher the adhesiveness, the slower the movement speed, allowing the magnetic member 15 to move slowly and less susceptible to the influence of the next magnetic member 15, making it easier to follow the movement of the magnetic member 15.

[0088] In this embodiment, the magnetic sludge recovery device 1 is equipped with a drive unit 14 that allows for variable movement speed, so that the speed can be adjusted to the speed that provides the best transport performance according to the viscosity of the magnetic sludge S.

[0089] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of Symbols]

[0090] 1. Magnetic sludge recovery device 3a, 3b rails 11. Drive sprocket (rotating drive unit) 12. Driven sprocket (guide member) 13 Conveying components 14 Drive Unit 15 Magnetic component 16 Magnets 17 Yoke member 20 Sludge carrier 20a Reverse side 20b Conveyor surface 28 Discharge section 30 Magnetic cover (cover component) 31,31a,31b Legs 32 Cover body 32a Arc-shaped surrounding portion (upper cover portion) 32b Drooping part (Drooping cover part) 60 Liquid to be treated 201 Arc-shaped section

Claims

1. A magnetic sludge recovery device that recovers magnetic sludge mixed in a liquid to be treated by immersing its lower side in the liquid to be treated, A rotating drive unit disposed on one side (upper and lower) and a guide member disposed on the other side (upper and lower), A conveying member that is stretched across the rotary drive body and the guide member and travels, A drive unit that drives the aforementioned rotary drive unit, A magnetic member attached to the transport member and moving, comprising a plurality of magnetic members arranged at intervals from each other in the direction of movement of the transport member, A sludge carrier having no magnetism is positioned so that its back surface is aligned with the magnetic member, and the magnetic force of the magnetic member causes the magnetic sludge to be carried on its surface. A discharge unit that guides the magnetic sludge, which is supported in contact with a conveying surface formed on the surface of the sludge carrier, away from the magnetic member and discharges it by its own weight, A magnetic sludge recovery device comprising: a magnetic cover member that covers the conveying surface at a predetermined distance upstream of the discharge section in the direction of movement; and

2. The sludge carrier has an arc-shaped portion that changes the transport direction of the magnetic sludge from upward to downward, The discharge section is located downstream of the arc-shaped section in the direction of movement, The magnetic sludge recovery apparatus according to claim 1, wherein the cover member is provided so as to cover the arc-shaped portion.

3. The aforementioned transport members are provided in pairs in a lateral direction intersecting the direction of movement, The system further comprises a pair of magnetic rails that guide the movement of the pair of transport members, The cover member is A cover body positioned facing the transport surface, The cover body has legs extending toward the conveying surface at both ends in the lateral direction and in contact with the conveying surface, The magnetic sludge recovery apparatus according to claim 1 or 2, wherein the pair of rails and the legs at both ends are superimposed on the sludge carrier, sandwiching it between them.

4. The cover body is, An upper cover portion that covers the aforementioned arc-shaped portion, The magnetic sludge recovery apparatus according to claim 3, further comprising a hanging cover portion connected to the upstream end of the upper cover portion in the direction of movement.

5. The aforementioned magnetic member is formed in the shape that is elongated in the lateral direction and has a magnet and a yoke member. The yoke member is located on the opposite side of the magnet from the sludge carrier. The magnetic sludge recovery apparatus according to claim 3, wherein the magnetic member is arranged between the pair of transport members, and both lateral ends of the yoke member are connected to the pair of transport members.

6. The magnetic sludge recovery apparatus according to claim 1 or 2, wherein the spacing between some of the multiple magnetic members in the direction of movement is wider than that of other parts.

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