filtration device

Abstract

To provide a filtration device that can efficiently remove foreign matter. [Solution] A filtration apparatus according to one embodiment comprises a filtration tank having an inlet section including an inlet into which a liquid containing foreign matter flows, and an outlet for discharging the foreign matter, and having an outlet section located above the inlet section, and a conveyor disposed in the filtration tank for transporting the foreign matter from the inlet section to the outlet section. The conveyor has a first plate disposed across the inlet section and the outlet section on which the foreign matter accumulates, and a first scraper for transporting the foreign matter on the first plate toward the outlet section. The first scraper has a first outer peripheral surface that is circular in side view at a first end facing the first plate, and a second outer peripheral surface that is circular in side view at a second end located opposite the first end.

Description

Technical Field

[0001] The present invention relates to a filtering device.

Background Art

[0002] When machining a metal material or the like with a machine tool, various liquids called grinding fluids, cutting fluids, coolant fluids, etc. are used for the purpose of improving machining accuracy, extending the life of the tool, and promoting the discharge of chips and metal powders.

[0003] [[ID=I5]] )]]These liquids are discharged from the machine tool in a state containing foreign matters such as chips generated by machining. After removing the foreign matters, the discharged liquids are returned to the machine tool and reused. In machine tools, diversified machining was performed by multiple machines, but in recent years, efficiency has been improved by machining with a single multi-tasking machine. The chips generated by the multi-tasking machine include large chips in the shape of dumplings and curls as well as fine chips in the shape of sand and grains, and various proposals have been made for these chips (for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Even based on the proposals in these patent documents, there is still room for various improvements in the structure for separating foreign matters from liquids. Since foreign matters include various types and shapes of chips, metal chips, etc., a device capable of treating the liquids discharged together with these is desired.

[0006] Therefore, one of the objectives of the present invention is to provide a filtration device that can efficiently discharge foreign matter. [Means for solving the problem]

[0007] A filtration apparatus according to one embodiment includes a filtration tank having an inlet section including an inlet into which a liquid containing foreign matter flows, and a discharge section located above the inlet section, which includes a discharge port for discharging the foreign matter, and a conveyor disposed in the filtration tank for transporting the foreign matter from the inlet section to the discharge section. The conveyor has a first plate disposed across the inlet section and the discharge section on which the foreign matter accumulates, and a first scraper for transporting the foreign matter on the first plate toward the discharge port. The first scraper is, It has a flat main body and first and second ends provided on both sides of the main body. The first ends face the first plate and have a circular first outer surface when viewed from the side. The second ends have a circular second outer surface when viewed from the side.

[0008] before In the side view, the widths of the first end and the second end may be greater than the width of the main body. The first scraper is defined by the first outer surface, the second outer surface, and the main body, and may have a space for supporting the foreign object during transport. The first scraper may move in the discharge section such that the first gap between the first end and the first plate increases along the first plate. The conveyor may further have a chain to which the first scraper is attached and for moving the first scraper. The chain may be arranged in the discharge section such that the second gap between the chain and the first plate increases as it moves along the first plate.

[0009] The conveyor may have at least one removal section at the discharge section for removing the foreign matter adhering to the first scraper. The filtration device may further include a second plate positioned below the conveyor, spanning the inlet and discharge sections. The conveyor may further include a second scraper for transporting the foreign matter accumulated on the second plate toward the first plate. The second scraper may have a contact section at a third end facing the second plate that contacts the second plate, and a third outer surface that is circular in side view at a fourth end located opposite the third end. The filtration device may further include a filter mechanism positioned below the second plate for further filtering the liquid that has passed through the second plate. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a filtration device that can efficiently discharge foreign matter. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic side view of a filtration device according to one embodiment. [Figure 2] Figure 2 is a schematic plan view of the first tank in one embodiment. [Figure 3] Figure 3 is a schematic plan view of the second tank in one embodiment. [Figure 4] Figure 4 is a schematic perspective view of the scraper. [Figure 5] Figure 5 is a schematic cross-sectional view of the scraper along the VV line in Figure 4. [Figure 6] Figure 6 is a schematic perspective view of the scraper. [Figure 7] Figure 7 is a schematic cross-sectional view of the scraper along the line VII-VII in Figure 6. [Figure 8] Figure 8 is an enlarged view showing the vicinity of the horizontal portion of the plate in the discharge section. [Figure 9]FIG. 9 is an enlarged view showing the vicinity of the sprocket in the discharge section. [Figure 10] FIG. 10 is an enlarged view showing the vicinity of the driven part in the discharge section. [Figure 11A] FIG. 11A is a side view showing the scraper according to the comparative example. [Figure 11B] FIG. 11B is a side view showing the scraper according to the comparative example. MODE FOR CARRYING OUT THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. For the sake of clarity in the description, in the drawings, the sizes, shapes, etc. of each part may be changed and schematically represented with respect to the actual embodiment.

[0013] In the present embodiment, a filtering device for filtering the liquid discharged from the machine tool is disclosed. The machine tool is, for example, a machining center, but is not limited to this example. The liquid is, for example, a coolant, but may be a grinding fluid, a cutting fluid, etc., and includes water-soluble liquids and oil-based liquids. Foreign matters include, for example, chips, cutting scraps, metal chips, and those in which these are entangled with each other.

[0014] FIG. 1 is a schematic side view of the filtering device 100 according to the present embodiment. FIG. 2 is a schematic plan view of the first tank 15 in the present embodiment. FIG. 3 is a schematic plan view of the second tank 16 in the present embodiment.

[0015] In the following drawings, the first direction X, the second direction Y, and the third direction Z are respectively defined. One side of the third direction Z may be referred to as "up" or "upper", and the other side of the third direction Z may be referred to as "down" or "lower". In the following description, viewing the filtering device 100 in the direction opposite to the second direction Y may be referred to as a side view, and viewing the filtering device 100 in the direction opposite to the third direction Z may be referred to as a plan view. In the following drawings, for the sake of explanation, some elements are shown transparently as appropriate.

[0016] The filtration device 100 includes a filtration tank 10 for containing coolant liquid containing foreign matter. The filtration tank 10 is formed in a box shape that is elongated in the first direction X by a bottom plate, a top plate, and side plates. The filtration tank 10 is formed from, for example, a metal plate, but is not limited to this example.

[0017] Furthermore, the length in the first direction X, the length in the second direction Y, the length in the third direction Z of the filtration tank 10, the amount of coolant liquid stored in the filtration tank 10, and the coolant liquid processing capacity of the filtration device 100 are set appropriately according to the specifications and layout of the machine tool.

[0018] The filtration tank 10 has an inlet 11, a discharge 12 located above the inlet 11, and an inclined section 13 connecting the inlet 11 and the discharge 12. The inlet 11 includes an inlet 111 into which coolant liquid flows in from the outside, and the discharge 12 includes an outlet 121 for discharging foreign matter to the outside. A recovery tank TA for collecting foreign matter may be placed below the outlet 121.

[0019] The inclined section 13 connects the inlet section 11 and the outlet section 12. In the example shown in Figure 1, the inclined section 13 slopes from the inlet section 11 towards the outlet section 12. In one example, the angle of the inclined section 13 is approximately 60 degrees. This angle can be appropriately changed depending on the arrangement of the inlet section 11 and the outlet section 12.

[0020] In Figure 1, the liquid level of the coolant liquid contained in the filtration tank 10 is shown as the liquid level LS. The outlet 121 is set at a position higher than the liquid level LS when the filtration device 100 is in operation. The filtration tank 10 may also have an outlet 113 at the inlet 11 for the coolant liquid to overflow in the event of a malfunction.

[0021] The filtration device 100 further comprises a conveyor 20, a conveyor 30 positioned below the conveyor 20, a plate 40 (second plate) positioned between the conveyor 20 and the conveyor 30, and a filter mechanism 50.

[0022] In this embodiment, the filtration device 100 includes a two-stage conveyor. Each of the conveyors 20, 30, and 40 is arranged in the filtration tank 10 across the inlet 11, the inclined section 13, and the discharge section 12.

[0023] Plate 40 divides the filtration tank 10 into a first tank 15 where the conveyor 20 is located and a second tank 16 where the conveyor 30 is located. The second tank 16 is located below the first tank 15. Plate 40 also divides the outlet 121 into an outlet 1211 located in the first tank 15 and an outlet 1212 located in the second tank 16. Outlets 1211 and 1212 are aligned in the first direction X.

[0024] Plate 40 has filtration sections 41A, 41B, and 41C at the inlet 11. In Figure 1, the filtration sections 41A, 41B, and 41C are shown with diagonal lines. The coolant liquid flows from the first tank 15 to the second tank 16 through the filtration sections 41A, 41B, and 41C.

[0025] The filtration sections 41A, 41B, and 41C are aligned in a first direction X. Each of the filtration sections 41A, 41B, and 41C has multiple through-holes (not shown). Foreign matter that cannot pass through these multiple through-holes accumulates on top of the filtration sections 41A, 41B, and 41C. The filtration sections 41A, 41B, and 41C of the plate 40 are formed of, for example, perforated metal, but are not limited to this example.

[0026] Next, I will explain conveyor 20.

[0027] The conveyor 20 transports foreign matter contained in the coolant liquid flowing in from the inlet 111 from the inlet 11 to the discharge 12. As shown in Figures 1 and 2, the conveyor 20 includes a plate 21 (first plate), a scraper 22 (first scraper), a scraper 23 (second scraper), chains 24A and 24B for moving the scrapers 22 and 23, and a drive unit 25.

[0028] As shown in Figure 2, the drive unit 25 includes a motor 251, sprockets 252A, 252B, sprockets 253A, 253B, and driven units 254, 255. The motor 251, sprockets 252A, 252B, and sprockets 253A, 253B are located in the discharge unit 12. The motor 251 is fixed to the side plate of the first tank 15 via a bracket or the like.

[0029] Sprocket 252A is connected to motor 251. Sprockets 252A and 252B are also connected to sprockets 253A and 253B by a transmission element (not shown).

[0030] As shown in Figure 2, the sprockets 252A, 252B, and sprockets 253A, 253B are positioned on both sides of the first groove 15. The sprockets 252A, 252B, and sprockets 253A, 253B are connected, respectively, by shafts 252Y, 253Y, which extend in the second direction Y.

[0031] Chains 24A and 24B are arranged on both sides of the first tank 15 in the second direction Y, extending from the inlet 11 to the outlet 12. Specifically, chains 24A and 24B are arranged in the order of driven part 254, sprockets 253A and 253B, driven part 255, and sprockets 252A and 252B. As a result, chains 24A and 24B are rotated by the drive of motor 251.

[0032] As shown in Figure 1, the driven part 254 is located at the inlet 11, and the driven part 255 is located at the discharge 12. The driven parts 254 and 255 may rotate in accordance with the movement of the chains 24A and 24B, or they may be configured to support the chains 24A and 24B without rotating. The conveyor 20 may further have chain guides arranged along the chains 24A and 24B in order to move the chains 24A and 24B stably. The chain guides are located in places where the direction of movement of the chains 24A and 24B changes.

[0033] As shown in Figure 1, plate 21 is positioned across the inlet section 11, the inclined section 13, and the discharge section 12. Plate 40 is positioned between plate 21 and the conveyor 30.

[0034] Plate 21 divides the first tank 15 into an upper space 151 and a lower space 152. The liquid level LS is located above plate 21 at the inlet 11.

[0035] Focusing on chains 24A and 24B, they rotate around plate 21 in a side view. In Figures 1 and 2, chains 24A and 24B are shown by dashed lines. These correspond to the trajectories of chains 24A and 24B.

[0036] The plate 21 has a horizontal section 21A located at the inlet section 11, an end section 21B located closer to the driven section 254 than the horizontal section 21A, an inclined section 21C rising approximately parallel to the inclined section 13, a horizontal section 21D located at the discharge section 12, and a discharge end section 21E connected to the horizontal section 21D. The end section 21B, the horizontal section 21A, the inclined section 21C, the horizontal section 21D, and the discharge end section 21E are integrally formed.

[0037] The horizontal section 21A has filtration sections 26A and 26B. In Figure 1, the filtration sections 26A and 26B are shown with diagonal lines. The coolant flows from the upper space 151 to the lower space 152 through the filtration sections 26A and 26B. The filtration sections 26A and 26B are aligned in the first direction X. Filtration section 26A is located above filtration section 41A of the plate 40, and filtration section 26B is located above filtration section 41B.

[0038] As shown in Figure 2, the filtration sections 26A and 26B have a plurality of through-holes 260. The size of the through-holes 260 is, for example, 8 mm to 12 mm. Foreign matter that cannot pass through the through-holes 260 accumulates on top of the filtration sections 26A and 26B. The filtration sections 26A and 26B are formed of, for example, perforated metal, but are not limited to this example.

[0039] The filtration sections 41A, 41B, and 41C of the plate 40 described above are formed of the same perforated metal as the perforated metal forming the filtration sections 26A and 26B. The size of the through-holes 260 is preferably larger than the size of the through-holes in the filtration sections 41A, 41B, and 41C of the plate 40. The shape of the through-holes may be circular, polygonal, or slit-shaped.

[0040] The end portion 21B of the plate 40 is positioned around the driven portion 254, as shown in Figure 1. The end portion 21B includes an inclined portion that rises from the horizontal portion 21A toward the driven portion 254. The horizontal portion 21D and the discharge end portion 21E are connected by an arc-shaped connecting portion (connecting portion 21F shown in Figure 8) that curves along the outer circumference of the axis 253Y. In a side view, the discharge end portion 21E forms an acute angle with the horizontal portion 21D.

[0041] Plate 21 has an upper surface 210. The upper surface 210 is formed from end 21B to discharge end 21E. The upper surface 210 faces the inlet 111 at the inclined portion of end 21B and the horizontal portion 21A. The upper surface 210 includes the upper surfaces of the filtration sections 26A and 26B described above.

[0042] The conveyor 20 has at least one scraper 22 and at least one scraper 23. In this embodiment, the conveyor 20 has five scrapers 22 and five scrapers 23. The scrapers 22 and 23 are attached to chains 24A and 24B at predetermined intervals.

[0043] Scrapers 22 and 23 move around plate 21 together with chains 24A and 24B. As shown by the arrows in Figure 1, scrapers 22 and 23 move in the upper space 151 from the inlet 11 to the outlet 12, and in the lower space 152 from the outlet 12 to the inlet 11.

[0044] Specifically, scrapers 22 and 23 move along the upper surface 210 of plate 21 in the upper space 151 and along the upper surface 400 of plate 40 in the lower space 152.

[0045] Next, I will explain conveyor 30.

[0046] The conveyor 30 transports foreign matter accumulating in the second tank 16 from the inlet 11 to the outlet 121. The conveyor 30 is positioned across the inlet 11, the inclined section 13, and the outlet 12.

[0047] As shown in Figures 1 and 3, the conveyor 30 includes a scraper 31, chains 32A and 32B for moving the scraper 31, and a drive unit 33.

[0048] As shown in Figure 3, the drive unit 33 includes a motor 331, sprockets 332A and 332B, and driven units 333A and 333B. The motor 331 and sprockets 332A and 332B are located in the discharge section 12, and the driven units 333A and 333B are located in the inlet section 11. The motor 331 is fixed to the side plate of the second tank 16 via a bracket or the like.

[0049] Sprocket 332B is connected to motor 331. Sprockets 332A, 332B and driven parts 333A, 333B are arranged on both sides of the second groove 16, as shown in Figure 3. Sprockets 332A, 332B are connected by shaft 332Y extending in the second direction Y.

[0050] Chains 32A and 32B are arranged on both sides of the second tank 16 in the second direction Y, extending from the inlet 11 to the outlet 12. Specifically, chains 32A and 32B are arranged in the order of driven parts 333A and 333B, and sprockets 332A and 332B. The conveyor 30 may further have chain guides arranged along chains 32A and 32B to move the chains 32A and 32B stably.

[0051] The conveyor 30 has at least one scraper 31. In this embodiment, the conveyor 30 has 11 scrapers 31. The multiple scrapers 31 are attached to chains 32A and 32B at predetermined intervals. The intervals between these scrapers 31 can be changed as appropriate. The scrapers 31 move inside the second tank 16 together with the chains 32A and 32B.

[0052] As shown by the arrow in Figure 1, the scraper 31 moves along the bottom plate 110 of the filtration tank 10 from the inlet 11 to the outlet 12. In a side view, the direction of movement of the scraper 31 is opposite to that of the scrapers 22 and 23.

[0053] The scraper 31 is attached to chains 32A and 32B. The scraper 31 has a main body 310, as shown in an enlarged view below the filtration device 100 in Figure 1. The main body 310 is inclined at an obtuse clockwise angle in a side view with respect to the direction of movement of the scraper 31 (indicated by arrow A1 in Figure 1). This allows foreign matter on the bottom plate 110 to be scraped up and transported to the discharge port 1212. Focusing on its relationship with the bottom plate 110, the ends of the main body 310 do not come into contact with the bottom plate 110.

[0054] The scraper 31 is detachably attached to the chains 32A and 32B by fastening elements F1 (e.g., bolts and nuts). This allows the user to replace the scraper 31 as needed. The main body 310 of the scraper 31 is formed of, for example, a metal material.

[0055] The filter mechanism 50 is located at the inlet 11 of the second tank 16. In other words, the filter mechanism 50 is located below the plate 40. The filter mechanism 50 further filters the coolant liquid that has passed through the plates 21 and 40. The filtration device 100 discharges the coolant liquid filtered by the filter mechanism 50 to the outside.

[0056] The filter mechanism 50 includes at least one rolling filter 51. In this embodiment, there are three rolling filters 51. These rolling filters 51 are arranged in a first direction X at the inlet 11. These rolling filters 51 are rotatably positioned about an axis extending in a second direction Y below the filtration section 26A of plate 21 and the filtration section 41A of plate 40.

[0057] The rolling filter 51 has a cylindrical section 510 and a scraper 520, as shown in an enlarged view below the filtration device 100 in Figure 1. The cylindrical section 510 has sprockets 511A and 511B positioned on both sides in the second direction Y. Chains 32A and 32B mesh with the sprockets 511A and 511B from above. As a result, the cylindrical section 510 rotates in sync with the movement of chains 32A and 32B.

[0058] As shown in Figure 3, the cylindrical portion 510 has a plurality of through holes 512. Coolant liquid flows into the inside of the cylindrical portion 510 through the through holes 512. The size of the through holes 512 is smaller than the size of the through holes 260 in the filter sections 26A, 26B, 41A, 41B, and 41C, for example.

[0059] The scraper 520 is positioned so that its tip 520E contacts the outer circumferential surface of the cylindrical portion 510. As the cylindrical portion 510 rotates, the scraper 520 removes foreign matter adhering to the outer circumferential surface, and the removed foreign matter settles under its own weight and accumulates on the bottom plate 110.

[0060] Next, we will describe the structures applicable to the scrapers 22 and 23 of the conveyor 20 in this embodiment.

[0061] Figure 4 is a schematic perspective view of the scraper 22. Figure 5 is a schematic cross-sectional view of the scraper 22 along the VV line in Figure 4. Figure 5 shows the scraper 22 viewed in the opposite direction to the second direction Y. The scraper 22 transports foreign matter on the upper surface 210 of the plate 21 toward the discharge port 121.

[0062] The scraper 22 is positioned between chains 24A and 24B in the second direction Y. The scraper 22 is attached to chains 24A and 24B via fittings 61A and 61B.

[0063] The mounting fixture 61A is located on the chain 24A, and the mounting fixture 61B is located on the chain 24B. The mounting fixtures 61A and 61B have a first mounting portion 611 attached to the chains 24A and 24B, and a second mounting portion 612 attached to the scraper 22. The first mounting portion 611 and the second mounting portion 612 are formed as a single unit.

[0064] The scraper 22 has a main body 70 and ends 71 ​​and 72 located on both sides of the main body 70 in the third direction Z. In this embodiment, end 71 corresponds to the first end and end 72 corresponds to the second end.

[0065] The main body portion 70 is located between the end portion 71 and the end portion 72. The main body portion 70 has a flat plate shape that is substantially parallel to the YZ plane defined by the second direction Y and the third direction Z. Here, substantially parallel includes the case where it is slightly inclined with respect to the reference plane. The length of the main body portion 70 in the third direction Z is greater than, for example, the length of the end portions 71 and 72 in the third direction Z.

[0066] End portion 71 faces the upper surface 210 of plate 21 in the upper space 151. End portion 72 is located on the opposite side of end portion 71 in the third direction Z, with chains 24A and 24B in between. End portion 72 faces plate 40 in the lower space 152.

[0067] Ends 71 ​​and 72 each have outer circumferential surfaces 710 and 720, respectively. In this embodiment, outer circumferential surface 710 corresponds to the first outer circumferential surface, and outer circumferential surface 720 corresponds to the second outer circumferential surface. The outer circumferential surfaces 710 and 720 are formed continuously around an axis extending in the second direction Y.

[0068] As shown in Figure 5, the outer surfaces 710 and 720 are circular in shape when viewed from the side. Here, the term "circular shape" is not limited to a perfect circle, but includes oval shapes, elliptical shapes, shapes with parts of these shapes missing, and shapes that combine arc shapes and straight lines.

[0069] In a side view, the width W1 of end 71 is equal to, for example, the width W2 of end 72. Here, the width corresponds to the length in the first direction X. If the outer surfaces 710 and 720 are circular, the widths W1 and W2 correspond to the outer diameters of the outer surfaces 710 and 720. The widths W1 and W2 of end 71 and end 72 are, for example, 10 mm to 20 mm. Note that the width W1 of end 71 may be greater than the width W2 of end 72, and the width W1 of end 71 may be less than the width W2 of end 72.

[0070] Focusing on the main body 70, the widths W1 and W2 of the ends 71 ​​and 72 are greater than the width W3 of the main body 70 in a side view. At least a portion of the ends 71 ​​and 72 protrude beyond the main body 70 in the direction of movement of the scraper 22 (indicated by arrow A1 in Figure 5).

[0071] End portion 71 has protrusions 711 and 712 that extend beyond the main body portion 70, and end portion 72 has protrusions 721 and 722 that extend beyond the main body portion 70. The outer shape of these protrusions 711, 712, 721, and 722 is arc-shaped. In other words, the scraper 22 has a space SP1 (marked with a dot in Figure 5) defined by the outer circumferential surfaces 710 and 720 and the surface 700 of the main body portion 70.

[0072] Focusing on its relationship with plate 21, the outer circumferential surface 710 of the end portion 71 does not contact the upper surface 210 of plate 21, as shown in Figure 5. A gap G1 is formed between the outer circumferential surface 710 and the upper surface 210. Here, the distance between the outer circumferential surface 710 and the upper surface 210 is defined as the distance D1 (first distance). The distance D1 is, for example, between 2 mm and 8 mm.

[0073] The scraper 22 further has mounting portions 73. The mounting portions 73 are located on both sides of the main body in the second direction Y. The mounting portions 73 are substantially parallel to the XY plane defined by the first direction X and the second direction Y. The mounting portions 73 are removablely attached to the second mounting portion 612 by fastening elements F1. This allows the user of the filtration device 100 to replace the scraper 22 as needed. The scraper 22 can be formed, for example, by welding together plate and round bars made of a metal material.

[0074] Next, I will explain the scraper 23.

[0075] Figure 6 is a schematic perspective view of the scraper 23. Figure 7 is a schematic cross-sectional view of the scraper 23 along the line VII-VII in Figure 6. Figure 7 shows the scraper 23 viewed in the opposite direction to the second direction Y. The scraper 23 transports foreign matter accumulated on the upper surface 400 of plate 40 to the upper surface 210 of plate 21.

[0076] The scraper 23 is positioned between chains 24A and 24B in the second direction Y. Like the scraper 22, the scraper 23 is attached to chains 24A and 24B via fittings 61A and 61B.

[0077] The scraper 23 has a main body 80 and ends 81 and 82 located on both sides of the main body 80 in the third direction Z. In this embodiment, end 81 corresponds to the third end and end 82 corresponds to the fourth end. The main body 80 has a flat plate shape that is substantially parallel to the YZ plane.

[0078] End portion 81 faces the upper surface 400 of plate 40 in the lower space 152. End portion 82 is located on the opposite side of end portion 81 in the third direction Z, with chains 24A and 24B in between. End portion 82 faces the upper surface 210 of plate 21 in the upper space 151.

[0079] The main body portion 80 has a contact portion 810 at its end portion 81. The contact portion 810 is part of the end portion 81. The contact portion 810 protrudes from the main body portion 80 in the direction opposite to the third direction Z.

[0080] The contact portion 810 is in contact with the upper surface 400 of the plate 40. In other words, there is no gap between the contact portion 810 and the upper surface 400. This allows foreign matter on the upper surface 400 to be efficiently transported towards the upper space 151, and fine foreign matter on the upper surface 400 to fall from the filtration sections 41A, 41B, and 41C into the second tank 16.

[0081] The contact portion 810 is composed of a strip-shaped member B1 that is removablely attached to the main body portion 80 by fastening elements F2 (e.g., bolts and nuts). This allows the user to replace the strip-shaped member B1 as needed. The length of the strip-shaped member B1 in the second direction Y is smaller than the length of the main body portion 80 in the second direction Y.

[0082] The end portion 82 has an outer circumferential surface 820 (third outer circumferential surface). The outer circumferential surface 820 is continuously formed around an axis extending in the second direction Y. As shown in Figure 7, the end portion 82 is circular in side view. The width W4 of the end portion 82 is equal to, for example, the widths W1 and W2 of the ends 71 ​​and 72, but may be different.

[0083] Focusing on the main body 80, the width W4 of the end portion 82 is greater than the width W5 of the main body 80 in a side view. From another viewpoint, at least a portion of the end portion 82 protrudes beyond the main body 80 in the direction of movement of the scraper 23 (indicated by arrow A2 in Figure 7).

[0084] The scraper 23 further has mounting portions 83. The mounting portions 83 are located on both sides of the main body 80 in the second direction Y. The mounting portions 83 are substantially parallel to the XY plane. The mounting portions 83 are removablely attached to the fixtures 61A and 61B by fastening elements F1. This allows the user to replace the scraper 23 as needed.

[0085] The main body 80 and end portion 82 of the scraper 23 are formed of, for example, a metal material. The strip-shaped member B1 is formed of a different material from the main body 80. Specifically, the material forming the strip-shaped member B1 is flexible. In other words, the strip-shaped member B1 bends as the scraper 23 moves along the plate 40.

[0086] The strip-shaped member B1 is formed from, for example, a rubber material, a resin material, or a laminated structure thereof. Preferably, the strip-shaped member B1 is made from a material with excellent wear resistance. In one example, the strip-shaped member B1 is made from the material that constitutes a belt, such as that used in a belt conveyor.

[0087] A plate-shaped pressing member 84 may be further placed between the main body 80 and the strip-shaped member B1. By pressing down on the entire strip-shaped member B1 with the pressing member 84, excessive deformation of the strip-shaped member B1 is suppressed, making it easier to transport foreign objects on the upper surface 400.

[0088] Next, we will describe a structure applicable to the discharge section 12 of the filtration device 100. Figures 8 to 10 below show the chain 24A side, but the chain 24B side is configured similarly.

[0089] Figure 8 is an enlarged view showing the vicinity of the horizontal portion 21D of the plate 21 in the discharge section 12. As described above, the horizontal portion 21D and the discharge end 21E are connected by a connecting portion 21F, and the discharge end 21E forms an acute angle with the horizontal portion 21D. As shown in Figure 8, the discharge end 21E of the plate 21 is inclined such that the distance from the chain 24A increases along the direction of movement of the scrapers 22 and 23.

[0090] The chain 24A is inclined with respect to the upper surface 210 of the horizontal section 21D. Specifically, the chain 24A is positioned such that the gap D2 (second gap) between the chain 24A and the upper surface 210 of the plate 21 increases as it moves along the plate 21. Focusing on the scraper 22, the scraper 22 moves such that the gap D1 (shown in Figure 5) between the end 71 and the upper surface 210 increases along the plate 21. The gaps D1 and D2 are largest, for example, above the center of the sprocket 253A.

[0091] Here, we define the angle of the chain 24A with respect to the horizontal portion 21D of the plate 21 as angle θ1. Angle θ1 is, for example, between 1 and 5 degrees. Angle θ1 is appropriately changed depending on the length of the horizontal portion 21D in the first direction X, the size of the foreign object, etc.

[0092] Although we have focused on scraper 22 here, scraper 23 has a similar relationship. Specifically, the gap between the end portion 82 and the top surface 210 of scraper 23 increases as it moves along plate 21.

[0093] Figure 9 is an enlarged view showing the vicinity of the sprocket 253A in the discharge section 12. Figure 10 is an enlarged view showing the vicinity of the driven section 255 in the discharge section 12.

[0094] The conveyor 20 may further have a removal section 90 for removing foreign matter adhering to the scrapers 22 and 23. The removal section 90 is located above the discharge port 121. Specifically, the removal section 90 is positioned after the scrapers 22 and 23 have passed through the horizontal section 21D.

[0095] In the examples shown in Figures 9 and 10, the removal section 90 includes a first removal section 91, a second removal section 92, and a third removal section 93. The first removal section 91, the second removal section 92, and the third removal section 93 are arranged in this order in the direction of movement of the scrapers 22 and 23.

[0096] As shown in Figure 9, the first removal section 91 is provided at the discharge end 21E of the plate 21. The first removal section 91 includes a plate 910 positioned at the discharge end 21E and a plurality of pins 920 protruding from the plate 910. The plate 910 is detachably attached to the discharge end 21E by fastening members.

[0097] Multiple pins 920 are arranged at predetermined intervals on the connecting portion 21F side of the plate 910. The arrangement of the multiple pins 920 can be changed as appropriate. The multiple pins 920 protrude perpendicularly to the upper surface 210 of the discharge end 21E. The cross-sectional shape of the pins 920 can be circular or square. Focusing on the relationship with the scraper 22, the pins 920 protrude toward the end 71. Note that the pins 920 are arranged so as not to come into contact with the outer circumferential surface 710 of the end 71.

[0098] The second removal section 92 is a strip-shaped member B2 attached to the lower end of the plate 910 of the first removal section 91. The strip-shaped member B2 is detachably attached to the plate 910 by fastening members.

[0099] As shown in Figure 9, the strip-shaped member B2 is positioned from the lower end of the plate 910 toward the chains 24A and 24B. The strip-shaped member B2 has an elongated shape in the second direction Y. The strip-shaped member B2 is positioned to contact the outer circumferential surface 710 of the end 71 of the scraper 22.

[0100] The strip-shaped member makes overall contact with the end 71 in the second direction Y. The strip-shaped member B2 is flexible. As a result, the strip-shaped member B2 can bend and follow the movement of the scraper 22 to make contact with the outer surface 710.

[0101] The third removal section 93 is a strip-shaped member B3 attached to a bracket 17 below the driven section 255. The strip-shaped member B3 is detachably attached to the bracket 17. As shown in Figure 10, the strip-shaped member B3 is positioned from the bracket 17 below the driven section 255 toward the chains 24A and 24B. The strip-shaped member B3 has an elongated shape in the second direction Y.

[0102] As the scraper 22 passes the driven portion 255, its end portion 72 is positioned lower than its end portion 71. The strip-shaped member B3 is positioned to contact the outer circumferential surface 720 of the end portion 72 of the scraper 22.

[0103] The strip-shaped member B3 makes overall contact with the end 72 in the second direction Y. The strip-shaped member B3 is flexible. As a result, the strip-shaped member B3 can bend and follow the movement of the scraper 22 to make contact with the outer surface 720. The strip-shaped members B2 and B3 are formed from the same material as the strip-shaped member B1 described above, for example, but are not limited to this example.

[0104] The first removal unit 91 can remove foreign matter entangled in the end 71 of the scraper 22 using a plurality of pins 920. Specifically, the foreign matter entangled in the end 71 of the scraper 22 can be removed from the scraper 22 by getting caught on the plurality of pins 920.

[0105] The second removal section 92 can remove fine foreign matter adhering to the outer circumferential surface 710 of the end portion 71, which is difficult to remove by the first removal section 91. Furthermore, the third removal section 93 can remove fine foreign matter adhering to the outer circumferential surface 720 of the end portion 72. In addition, the scraper 23 can remove fine foreign matter adhering to the outer circumferential surface 820 of the end portion 82.

[0106] Next, the filtration process of the coolant liquid in the filtration device 100 will be described.

[0107] First, when coolant liquid flows into the inlet 111 from the outside, foreign matter contained in the coolant liquid settles in the first tank 15 and mainly accumulates on the upper surface 210. The scrapers 22 and 23 of the conveyor 20 transport the foreign matter on the upper surface 210 of the plate 21 towards the discharge port 121 in the upper space 151.

[0108] As the foreign object is transported along the inclined section 13, some of the coolant liquid adhering to the foreign object falls off. Also, as the scrapers 22 and 23 move through the upper space 151, fine foreign matter is dropped from the filtration sections 26A and 26B into the lower space 152.

[0109] When foreign matter is transported to the discharge section 12 by the scrapers 22 and 23, it falls due to its own weight as it passes through the connecting section 21F and is discharged to the outside through the discharge port 1211. In the first tank 15, the conveyor 20 discharges the foreign matter to the outside.

[0110] Some foreign matter may become entangled in or adhere to the scraper 22 even after passing through the connecting section 21F. However, the removal section 90 (first removal section 91, second removal section 92, third removal section 93) can remove the foreign matter from the scrapers 22 and 23. The removed foreign matter falls due to its own weight and is discharged to the outside through the discharge port 1211.

[0111] Furthermore, as shown in Figure 1, the inlet section 11 has a guide plate 27. The guide plate 27 is positioned below the driven section 254 at the end of the inlet section 11. In a side view, the guide plate 27 has an arc shape that follows the chains 24A and 24B.

[0112] The scrapers 22 and 23 transport foreign matter from the upper surface 400 of the plate 40 in the lower space 152 to the guide plate 27, and then scrape (transport) the foreign matter up to the plate 21 via the guide plate 27. In other words, the guide plate 27 prevents foreign matter from accumulating at the end of the inlet 11.

[0113] Then, the scrapers 22 and 23 transport the scraped-up foreign matter from the inlet 11 to the outlet 12. Also, as the scrapers 22 and 23 move through the lower space 152, fine foreign matter is dropped from the filtration sections 41A, 41B, and 41C into the second tank 16. The coolant liquid from the first tank 15 flows into the second tank 16, passing through the filtration sections 26A, 26B and 41A, 41B, and 41C in that order.

[0114] In the second tank 16, the filter mechanism 50 further filters the coolant liquid that has passed through the plates 21 and 40, and discharges the coolant liquid that has flowed into the inside of the cylindrical section 510 to the outside. The coolant liquid discharged to the outside is supplied to a machine tool (not shown). The filtration device 100 may further include a pump (not shown) for discharging the coolant liquid.

[0115] The scraper 31 of the conveyor 30 transports foreign matter on the bottom plate 110 toward the discharge port 1212. The second tank 16 has a guide plate 120 between the inlet 11 and the inclined section 13, as shown in Figure 1. In a side view, the guide plate 120 has an arc shape that follows the chains 32A and 32B.

[0116] The scraper 31 transports foreign matter from the bottom plate 110 of the inlet 11 to the guide plate 120, and then transports the foreign matter to the bottom plate 110 of the inclined section 13 via the guide plate 120. In other words, the guide plate 120 prevents foreign matter from accumulating between the inlet 11 and the inclined section 13.

[0117] As the foreign object is transported along the inclined section 13, some of the coolant liquid adhering to the foreign object falls off. When the foreign object is transported to the discharge section 12 by the scraper 31, it falls due to its own weight and is discharged to the outside through the discharge port 1212. As described above, the foreign object discharged from the discharge port 121 (discharge ports 1211, 1212) is stored in the recovery tank TA and then discarded.

[0118] In the filtration device 100, the filtration sections 26A and 26B of plate 21 and the filtration sections 41A, 41B, and 41C of plate 40 function as primary filters for filtering out foreign matter, and the filter mechanism 50 functions as a secondary filter for further filtering out foreign matter.

[0119] With the filtration device 100 configured as described above, foreign matter can be efficiently discharged. The effects of the filtration device 100 according to this embodiment will now be explained.

[0120] Figures 11A and 11B are side views showing a scraper 22E according to a comparative example. The scraper 22E according to the comparative example does not have elements corresponding to the outer peripheral surfaces 710 and 720 in this embodiment. In other words, the scraper 22E is formed only by a flat body portion 70E.

[0121] The foreign matter includes foreign matter of various shapes. For example, the foreign matter includes spiral-shaped foreign matter M1 and curl-shaped foreign matter M2. Because these foreign matter M1 and M2 are relatively large, they cannot pass through the filtration sections 26A and 26B of plate 21 and accumulate on the upper surface 210.

[0122] As shown in Figures 11A and 11B, foreign objects M1 and M2 tend to get entangled at both ends of the main body 70E in the third direction Z. Specifically, the end of foreign object M1 may get caught on the main body 70E, or the main body 70E may get stuck in the gap of foreign object M2.

[0123] Even if the scraper 22E reaches the discharge section 12 with foreign objects M1 and M2 entangled, the foreign objects M1 and M2 are unlikely to fall due to their own weight. Therefore, the scraper 22E may return to the inlet section 11 with the foreign objects M1 and M2 still entangled. This can not only reduce the efficiency of foreign object discharge in the filtration device, but the scraper 22E with entangled foreign objects can also reduce the performance of the scraper.

[0124] In this embodiment, the scraper 22 has circular outer surfaces 710 and 720 at its ends 71 ​​and 72 when viewed from the side. As a result, the scraper 22 is formed such that the widths W1 and W2 of ends 71 ​​and 72 are greater than the width W3 of the main body 70. Furthermore, no edges are formed on ends 71 ​​and 72.

[0125] Compared to the main body 70E of the scraper 22E, the widths W1 and W2 of the ends 71 ​​and 72 are larger than the width of the main body 70E. The outer surfaces 710 and 720 of the ends 71 ​​and 72 are less prone to entanglement of foreign objects M1 and M2 compared to the scraper 22E shown in Figures 11A and 11B. Specifically, the ends of foreign objects M1 are less likely to get caught on the ends 71 ​​and 72 of the main body 70, and the ends 71 ​​and 72 are less likely to get stuck in the gaps of foreign objects M2.

[0126] As a result, with the scraper 22, when the conveyed foreign objects M1 and M2 pass through the connecting section 21F (shown in Figure 8), they fall due to their own weight, ensuring that they are reliably discharged from the discharge port 1211. In other words, the scraper 22 makes it difficult for the foreign objects M1 and M2 that have been conveyed to the discharge section 12 to return to the inlet section 11.

[0127] Even if foreign objects M1 and M2 become entangled, the circular outer surfaces 710 and 720 do not have any edges that can catch the foreign objects M1 and M2. Therefore, when passing through the connecting section 21F (shown in Figure 8), the foreign objects M1 and M2 slide down the outer surfaces 710 and 720 due to their own weight and are discharged from the discharge port 1211. Furthermore, since the outer surfaces 710 and 720 are formed continuously in the second direction Y, the scraper 22 does not have any parts in the second direction Y where foreign objects M1 and M2 are likely to become entangled. With the filtration device 100 according to this embodiment, foreign objects can be efficiently discharged because it is equipped with a conveyor 20 having a scraper 22. Furthermore, since foreign objects are less likely to become entangled in the scraper 22, the conveying performance of the scraper 22 is less likely to deteriorate.

[0128] Foreign objects M1 and M2, formed from iron or aluminum alloys, tend to entangle with each other. When foreign objects M1 and M2 entangle with other foreign objects M1 and M2, a ball-shaped foreign object M10 (shown in Figures 5, 7, and 8) may be formed.

[0129] The ball-shaped foreign object M10 may go over the scraper 22E while being transported along the inclined section 13. In a side view, the widths W1 and W2 of the ends 71 ​​and 72 are greater than the width of the main body 70. As a result, the scraper 22 has a space SP1 (shown in Figure 5).

[0130] Space SP1 has the function of supporting foreign objects being transported as the scraper 22 moves. Space SP1 can transport foreign objects M1, M2, and M10, and prevent these foreign objects M1, M2, and M10 from falling on the inclined section 13. For example, by supporting foreign object M10 with space SP1, it becomes more difficult for foreign object M10 to go over the scraper 22, and it can be transported stably on the inclined section 13.

[0131] Furthermore, in this embodiment, the chains 24A and 24B of the conveyor 20 are arranged such that the distance D2 between the chains 24A and 24B and the upper surface 210 of the plate 21 increases as it moves along the plate 21. In other words, the scraper 22 moves such that the distance D1 between the end 71 and the upper surface 210 increases along the plate 21.

[0132] When the scraper 22E moves along the horizontal section 21D with parts of the foreign objects M1, M2, and M10 caught in the gap G1, the foreign objects M1, M2, and M10 become more deeply entangled with or compressed against the scraper 22E, making them less likely to come loose when the connecting section 21F is added.

[0133] In this embodiment, in the discharge section 12, chains 24A and 24B are arranged on the horizontal section 21D of the plate 21 as described above. This prevents the foreign objects M1, M2, and M10 from becoming more deeply entangled with the scrapers 22 and 23, even if some of them are caught in the gap G1. As a result, when adding the connecting section 21F, the foreign objects M1, M2, and M10 are more likely to come off the scrapers 22 and 23.

[0134] Furthermore, if the scraper 22E continues to move while foreign matter M1, M2, and M10 are deeply entangled with it, the foreign matter M1, M2, and M10 may get stuck in the gap G1, potentially causing the filtration device to stop due to overload. Such a shutdown of the filtration device can reduce the operating rate of the device. In this embodiment, it is possible to suppress the foreign matter M1, M2, and M10 from becoming more deeply entangled with the scrapers 22 and 23, thereby preventing unexpected shutdowns of the filtration device 100.

[0135] Furthermore, in this embodiment, the conveyor 20 further includes a scraper 23. The scraper 23 has a contact portion 810 at its end 81. The contact portion 810 moves while in contact with the upper surface 400 of the plate 40, thereby transporting foreign matter M1, M2, and M10 on the upper surface 400 toward the upper space 151, or causing fine foreign matter on the upper surface 400 to fall from the filtration sections 41A, 41B, and 41C into the second tank 16.

[0136] Furthermore, the scraper 23 has a circular outer surface 820 at its end 82 when viewed from the side. This prevents foreign matter M1, M2, and M10 from becoming entangled at the end 82 of the scraper 23. Thus, because the conveyor 20 is equipped not only with scraper 22 but also with scraper 23, foreign matter can be efficiently discharged from the first tank 15. In addition, by preventing the accumulation of foreign matter on plates 21 and 40, the flow of coolant liquid to the second tank 16 is less likely to be obstructed.

[0137] Furthermore, in this embodiment, the filtration device 100 has a removal unit 90. As explained with reference to Figures 8 to 10, the removal unit 90 can remove any foreign matter remaining on the scrapers 22 and 23.

[0138] Furthermore, in this embodiment, the filtration device 100 is further equipped with a filter mechanism 50 that filters the coolant liquid that has passed through plates 21 and 40. The coolant liquid in the second tank 16 contains fewer foreign substances than the coolant liquid in the first tank 15 because foreign substances have been removed by the first tank 15. Since the filter mechanism 50 can perform its function in a clean liquid, the filtration device 100 can supply cleaner coolant liquid to the machine tool.

[0139] With the filtration device 100 configured as described above, foreign matter can be efficiently discharged from the coolant liquid in the filtration tank 10. In addition, various other desirable effects can be obtained from this embodiment. The filtration device 100 equipped with conveyors 20 and 30 is particularly suitable as a filtration device for the coolant liquid of a multi-tasking machine with multiple processing capabilities, which discharges various types and shapes of chips, metal chips, etc., including foreign matter M1, M2, and M10.

[0140] In this embodiment, an example is disclosed in which the filtration device is equipped with a two-stage conveyor, but the above configuration can also be applied to conveyors of other filtration devices. In this embodiment, spiral-shaped foreign matter M1 and curled foreign matter M2 were given as examples of foreign matter, but foreign matter with shapes other than these is also less likely to get tangled in the scrapers 22 and 23.

[0141] In implementing the above embodiments, the specific configurations of each element constituting the filtration device, including the specific configurations of conveyors 20 and 30, 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.

[0142] An example of a filtration device obtained from the configuration disclosed herein is shown below. [1] A filtration tank having an inlet section including an inlet into which a liquid containing foreign matter flows, and a discharge section located above the inlet section including a discharge port for discharging the foreign matter, The filtration tank is equipped with a conveyor for transporting the foreign matter from the inlet to the discharge, The aforementioned conveyor is, A first plate is arranged across the inlet and outlet sections, on which the foreign matter accumulates, A first scraper for transporting the foreign matter on the first plate toward the discharge port, It has, The first scraper is, At the first end facing the first plate, a first outer surface that is circular in shape when viewed from the side, At the second end located opposite to the first end, the second outer surface, which is circular in side view, It has, Filtration device. [2] The first scraper further has a main body located between the first end and the second end, In the aforementioned side view, the widths of the first end and the second end are greater than the width of the main body. [2] The filtration apparatus described above. [3] The first scraper is defined by the first outer surface, the second outer surface, and the main body, and has a space for supporting the foreign object during transport. [2] The filtration apparatus described above. [4] The first scraper moves in the discharge section such that the first distance between the first end and the first plate increases along the first plate. A filtration device as described in any one of [1] to [3]. [5] The conveyor further has a chain to which the first scraper is attached and to which the first scraper is moved. The chain is arranged in the discharge section such that the second distance between the chain and the first plate increases as it progresses along the first plate. A filtration device as described in any one of [1] to [4]. [6] The conveyor has at least one removal section in the discharge section for removing the foreign matter adhering to the first scraper. A filtration apparatus as described in any one of [1] to [5]. [7] Below the conveyor, a second plate is further provided, which is arranged across the inlet and outlet sections. The conveyor further includes a second scraper for transporting the foreign matter accumulated on the second plate toward the first plate. The second scraper is, At the third end facing the second plate, there is a contact portion that contacts the second plate, At the fourth end located opposite to the third end, the third outer surface, which is circular in side view, It has, A filtration apparatus as described in any one of [1] to [6]. [8] It is further provided with a filter mechanism located below the second plate for further filtering the liquid that has passed through the second plate. [7] The filtration apparatus described above.

[0143] An example of a scraper obtained from the configuration disclosed herein is shown below. [9] A scraper that can be attached to a conveyor in a filtration device into which a liquid containing foreign matter flows, At the first end facing the plate where foreign matter is deposited, the first outer surface is circular in shape when viewed from the side, The second end, located opposite to the first end, has the second outer surface which is circular in side view, Scraper.

[10] It further has a main body portion located between the first end and the second end, In the aforementioned side view, the widths of the first end and the second end are greater than the width of the main body. The scraper described in [9].

[11] The first scraper is defined by the first outer surface, the second outer surface, and the main body, and has a space for supporting the foreign object during transport. The scraper described in

[10] . [Explanation of Symbols]

[0144] 10...Filtration tank, 11...Inlet, 12...Discharge, 13...Inclined section, 15...First tank, 16...Second tank, 20...Conveyor, 21...Plate, 22,23...Scraper, 24A,24B...Chain, 30...Conveyor, 31...Scraper, 32A,32B...Chain, 40...Plate, 50...Filter mechanism, 70,80...Main body, 71,72...Ends, 81,82...Ends, 90...Removal section, 100...Filtration device, 111...Inlet, 121...Discharge, 710,720...Outer surface, 810...Contact section, 820...Outer surface.

Claims

1. A filtration tank having an inlet section including an inlet into which a liquid containing foreign matter flows, and a discharge section located above the inlet section including a discharge port for discharging the foreign matter, The filtration tank is equipped with a conveyor for transporting the foreign matter from the inlet to the discharge, The aforementioned conveyor is, A first plate is arranged across the inlet and outlet sections, on which the foreign matter accumulates, A first scraper for transporting the foreign matter on the first plate toward the discharge port, It has, The first scraper has a flat main body and first and second ends provided on both sides of the main body. The first end is, Facing the first plate mentioned above, It has a circular first outer surface when viewed from the side, The second end has a second circular outer surface in the side view. Filtration device.

2. In the side view, the widths of the first end and the second end are greater than the width of the main body, The filtration apparatus according to claim 1.

3. The first scraper is defined by the first outer surface, the second outer surface, and the main body, and has a space for supporting the foreign object during transport. The filtration apparatus according to claim 2.

4. The first scraper moves in the discharge section such that the first distance between the first end and the first plate increases along the first plate. The filtration apparatus according to claim 1.

5. The conveyor further has a chain to which the first scraper is attached and to which the first scraper is moved. The chain is arranged in the discharge section such that the second distance between the chain and the first plate increases as it progresses along the first plate. The filtration apparatus according to claim 4.

6. The conveyor has at least one removal section in the discharge section for removing the foreign matter adhering to the first scraper. The filtration apparatus according to claim 1.

7. Below the conveyor, a second plate is further provided, which is arranged across the inlet and outlet sections. The conveyor further includes a second scraper for transporting the foreign material accumulated on the second plate toward the first plate. The second scraper is, At the third end facing the second plate, there is a contact portion that contacts the second plate, At the fourth end located opposite to the third end, the third outer surface, which is circular in side view, It has, A filtration apparatus according to any one of claims 1 to 6.

8. It is further provided with a filter mechanism located below the second plate for further filtering the liquid that has passed through the second plate. The filtration apparatus according to claim 7.

Images