Drum-type filtration device

Abstract

A drum-type filtration device capable of preventing meandering of a belt-shaped filter cloth when moving forward or backward. [Solution] The drum-type filtration device (1) comprises a case (11) having a front wall (11C) and a rear wall (11D) and a pair of side walls (11A, 11B) connecting the front wall and the rear wall, a drum (36) rotatably supported by a drum support shaft (31) whose both ends are attached to the pair of side walls, an upper winding section (24) arranged above the drum and which unwinds and sends out a wound strip-shaped filter cloth (18) to a filter feeding device (41) and winds up the strip-shaped filter cloth, and a pair of guide members (19A, 19B) attached to the pair of side walls and arranged near the upper winding section, which press both side edges of the unwound or wound strip-shaped filter cloth inward in the width direction perpendicular to the unwound and winding directions of the strip-shaped filter cloth.

Description

[Technical Field]

[0001] The present disclosure relates to a drum-type filtration device. [Background technology]

[0002] Various drum-type filtration devices have been proposed. In the filter cloth reciprocating filtration device described in Patent Document 1, the filter cloth wound around one shaft is unwound, passes through a guide roll, a suction box, and a sprinkler pipe, and is fed as the drum rotates while adhering to the surface of the drum via the guide roll. The filter cloth then passes through a guide roll, a suction box, and a sprinkler pipe, passes through the guide roll, and is wound up around the other shaft. When the filter cloth has been completely unwound from one shaft, the drive units are reversed, the filter cloth is transported in the opposite direction, and the filter cloth wound around the other shaft is unwound and wound up around one shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Registered Utility Model No. 3026488 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional configuration, when the filter cloth is pulled out from one shaft and moved forward, and when the filter cloth is wound up on the other shaft and moved backward, the filter cloth may meander and shift in the direction of the rotation axis relative to the drum, which may cause problems with filtration.

[0005] An object of one aspect of the present disclosure is to provide a drum-type filtration device that can prevent a belt-shaped filter cloth from meandering when moving forward or backward. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, a drum-type filtration device according to one aspect of the present disclosure includes a case having a front wall, a rear wall, and a pair of side walls connecting the front wall and the rear wall, a drum rotatably supported by a drum support shaft having both ends attached to the pair of side walls, a filter feeding device having an endless annular mesh belt disposed below the drum along the outer periphery of the drum, a longitudinal belt-shaped filter cloth sandwiched between the mesh belt and the drum and fed by the filter feeding device, and a wound belt-shaped filter cloth disposed above the drum. The filter apparatus comprises an upper winding section which unwinds the filter cloth to the filter feeding device and winds up the strip filter cloth, a lower winding section which is arranged downstream of the filter feeding device in the conveying direction of the strip filter cloth and winds up the strip filter cloth fed from the filter feeding device and unwinds the strip filter cloth, and a pair of guide members which are attached to the pair of side walls and arranged near the upper winding section and which press both side edges of the unwound or wound strip filter cloth inward in the width direction perpendicular to the unwound and winding directions of the strip filter cloth. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, it is possible to prevent the belt-shaped filter cloth from meandering when moving forward or backward. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic cross-sectional view illustrating the configuration of a drum-type filtration device according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is an enlarged view of a portion A1 in FIG. [Figure 3] 3 is a plan view of the upper winding section of FIG. 2 as seen from above. [Figure 4] FIG. 4 is a plan view illustrating an example of a guide member. [Figure 5] FIG. 4 is a front view showing an example of a guide member. [Figure 6] FIG. 10 is a perspective view showing an example of a guide member according to Modification 1. [Figure 7]7 is a plan view showing an example of the operation of the guide member of FIG. 6. FIG. [Figure 8] 7 is a side view showing an example of the operation of the guide member of FIG. 6. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Schematic configuration of drum-type filtration device] An embodiment of the present disclosure will be described in detail below with reference to FIGS. 1 to 4. A schematic configuration of a drum-type filtration device 1 according to this embodiment will be described with reference to FIG. 1. FIG. 1 is a side view of the drum-type filtration device 1 according to this embodiment (hereinafter also referred to as the "filtration device"), and is a schematic cross-sectional view taken along a vertical plane passing through the center of the width of the filtration device 1. The filtration device 1 is a device that filters, for example, grinding fluid or cutting fluid used in machining bearings or the like. As shown in FIG. 1, the filtration device 1 includes a substantially box-shaped case 11 and a clean tank 12 that stores purified coolant, i.e., clean fluid CF. The case 11 is disposed on the clean tank 12. The clean tank 12 is disposed on a horizontal floor surface 13.

[0010] The case 11 has a front wall 11C, a rear wall 11D, a pair of side walls 11A and 11B (see FIG. 3) connecting the front wall 11C and the rear wall 11D, a top wall 11D that closes from above an opening of a space surrounded by the front wall 11C, the rear wall 11D, and the pair of side walls 11A and 11B, and a bottom wall 11E. A communication hole (not shown) is formed in the bottom wall 11E to allow the purified clean liquid CF to fall into the clean tank 12. A notch 15 is formed in the end of the bottom wall 11E on the rear wall 11D side, and a sludge storage container 16 that opens upward and is disposed below the notch 15 for storing sludge SG.

[0011] A recessed groove 22 is formed in the upper wall 11D of the case 11, in which a cylindrical first roll 21 is rotatably disposed, around which one end of a strip filter cloth 18 of a predetermined width that functions as a strip filter is wound. The first roll 21 is rotatably supported by the side walls 11A and 11B. A filter cloth inlet 25 is formed penetrating the bottom of the recessed groove 22 (between the front wall 11C and the lower end of the recessed groove 22) and through which the strip filter cloth 18, unwound from the first roll 21 and hung on a guide shaft 23, is introduced into the case 11. The strip filter cloth 18 is a strip filter made of a filter material such as a nonwoven fabric or a woven fabric, but is not limited thereto, and the material may be appropriately selected depending on the purpose of filtration.

[0012] The guide shaft 23 is disposed between the side walls 11A, 11B horizontally relative to the floor surface 13, and both ends are attached by bolts or the like (see FIG. 3). A pair of guide members 19A, 19B are disposed between the first roll 21 and the guide shaft 23, attached to the pair of side walls 11A, 11B, and press both side edges of the strip filter cloth 18 inward in the width direction perpendicular to the unwinding and winding directions of the strip filter cloth 18 (see FIG. 3). One of the guide members 19B is shown in FIG. 1. The pair of guide members 19A, 19B are disposed between the guide shaft 23 and the upper winding section 24 in the unwinding direction of the strip filter cloth 18. More specifically, the pair of guide members 19A, 19B are disposed between the guide shaft 23 and the first roll 21, and are disposed closer to the front wall 11C than the maximum outer circumferential surface of the first roll 21.

[0013] In the filtration device 1, a cylindrical drum support shaft 31 is hung horizontally between a pair of side walls 11A, 11B to rotatably support a drum 36. The drum 36 is formed by a pair of circular members 32 rotatably supported by the drum support shaft 31 and connected to each other via a longitudinal connecting member 33 of a predetermined length so that they face each other at a fixed interval. The filtration device 1 further includes a filter feeding device 41 having an endless circular mesh belt 38 that runs along half the circumference of the lower outer periphery of the pair of circular members 32. The rotation center line CL of the drum 36 is also the center line of the cylindrical drum support shaft 31.

[0014] Above the sludge storage container 16, a cylindrical second roll 26, around which the other end of the strip filter cloth 18 is wound, is rotatably supported by the side walls 11A and 11B inside the rear wall 11D. The filter feeding device 41 includes a first torque motor TM1 that applies a constant torque to generate tension on the strip filter cloth 18 of the first roll 21 disposed above, and a second torque motor TM2 that applies a constant torque to generate tension on the strip filter cloth 18 of the second roll 26. As a result, the long strip filter cloth 18 is unwound from the first roll 21 while being applied with a constant tension, and is then taken up by the second roll 26 from the filter feeding device 41 via the sludge deliquor separation device 28, preventing slack.

[0015] The first torque motor TM1, which is disposed above the drum 36, constitutes an upper winding section 24 that unwinds the strip filter cloth 18 wound around the first roll 21 and feeds it to the filter feeding device 41, and winds up the strip filter cloth 18. The second torque motor TM2, which is disposed downstream of the filter feeding device 41 in the conveying direction of the strip filter cloth 18, constitutes a lower winding section 27 that winds up the strip filter cloth 18 fed from the filter feeding device 41, and unwinds the strip filter cloth 18.

[0016] The filter feeding device 41 is provided so as to surround the drum 36, and includes a drive roller 42 and three driven rollers 44A, 44B, and 44C around which an endless circular mesh belt 38 is wound, and an electric motor M that drives and rotates the drive roller 42. When the drive roller 42 is driven and rotated, the endless circular mesh belt 38 and the drum 36 are rotated. As a result, the strip-shaped filter cloth 18 unwound from the first roll 21 is sandwiched between the mesh belt 38 and the pair of circular members 32 in a semicircular shape, and is then fed from the filter feeding device 41 toward the second roll 26 via the sludge deliquor separation device 28. The mesh belt 38 is a mesh having numerous meshes and made of metal, synthetic fiber, carbon fiber, or composite material.

[0017] Of the three driven rollers 44A, 44B, and 44C, the driven roller 44C is disposed at a height equal to or higher than that of the drive roller 42. The pair of driven rollers 44A and 44B are positioned at a height such that the mesh belt 38 stretched between the pair of driven rollers 44A and 44B is positioned a predetermined distance below the drum 36, and are also disposed a predetermined distance apart in the horizontal direction. The strip-shaped filter cloth 18 sent from the filter feeding device 41 to the sludge deliquification separation device 28 is wound around the second roll 26.

[0018] The cylindrical drum support shaft 31 is configured so that contaminated fluid DF discharged from a polishing machine or grinding machine that uses coolant can flow into the interior of the drum support shaft 31 via piping connected from the outside of the filtration device 1. The contaminated fluid DF that has flowed into the interior of the drum support shaft 31 flows into the drum 36 from a discharge port (not shown) formed in the drum support shaft 31. As a result, the contaminated fluid DF remaining on the strip filter cloth 18 inside the drum 36 is passed downward through the strip filter cloth 18, and sludge SG is deposited on the outer peripheral surface of the strip filter cloth 18.

[0019] The filter feeding device 41 is provided on the drum support shaft 31 and includes a liquid level sensor 46 that detects the liquid level of the dirty liquid DF remaining on the strip-shaped filter cloth 18 inside the drum 36, and a motor control device 48 that controls the rotation of the drive roller 42. The motor control device 48 adjusts the rotation speed of the drive roller 42 driven by the electric motor M so that the liquid level detected by the liquid level sensor 46 becomes a preset liquid level height, thereby appropriately controlling the feed speed (forward speed) of the strip-shaped filter cloth 18.

[0020] When the amount of the filter cloth 18 fed forward toward the sludge deliquification separator 28 reaches a predetermined amount, the filter feed device 41 reciprocates, moving the filter cloth 18 backward a predetermined distance in the opposite direction, and then feeding the filter cloth 18 forward again. This allows the filter feed device 41 to use the filter cloth 18 multiple times to filter the coolant.

[0021] For example, when the filter feeding device 41 reaches a position where the number of remaining turns of the strip filter cloth 18 unwound from the first roll 21 becomes zero, the inflow of the dirty liquid DF from the drum support shaft 31 is stopped. Then, the filter feeding device 41 moves the strip filter cloth 18 backward to a position where the number of remaining turns of the strip filter cloth 18 on the second roll 26 becomes zero so that the portion of the strip filter cloth 18 from which sludge has been removed by the sludge deliquor separation device 28 is wound onto the first roll 21.

[0022] Next, with the inflow of dirty liquid DF from the drum support shaft 31 resumed, the filter feeding device 41 unwinds the portion of the strip filter cloth 18 wound around the first roll 21 from which sludge has been removed by the sludge drainage separation device 28. The filter feeding device 41 then advances the strip filter cloth 18 again so that it is wound around the second roll 26 via the sludge drainage separation device 28. The filter feeding device 41 then repeats this forward and backward movement of the strip filter cloth 18.

[0023] The sludge drainage separation device 28 includes a pair of nipping rollers 52 that continuously nip and press the sludge SG accumulated on the outer peripheral surface of the strip filter cloth 18 delivered from the filter feeding device 41. The sludge drainage separation device 28 also includes a pair of guide rollers 54, 56 positioned diagonally below the pair of nipping rollers 52 and spaced a predetermined distance apart in the vertical direction. The sludge drainage separation device 28 also includes a rotating brush 58 that separates the cake-like sludge SG that has been drained by the pair of nipping rollers 52 and that accumulates on the outer peripheral surface of the strip filter cloth 18, which is guided in contact with the lower outer peripheral surface of the lower guide roller 56. The clean liquid CF that is nipped between the pair of nipping rollers 52 from the sludge SG on the outer peripheral surface of the strip filter cloth 18 and falls through the strip filter cloth 18 is then guided into the clean tank 12 via a clean liquid guide plate 59.

[0024] In order to clamp the belt-shaped filter cloth 18 between the pair of clamping rollers 52, the pair of clamping rollers 52 is preferably configured so that at least one of the pair of clamping rollers 52 is made of an elastic material that is elastically deformable in the radial direction, such as synthetic rubber, or a roller biasing mechanism is provided that biases one bearing of the pair of clamping rollers 52 toward the other bearing.

[0025] [Guide shaft placement position] Next, the position of the guide shaft 23 will be described with reference to FIGS. 2 and 3. FIG. 2 is an enlarged view of portion A1 in FIG. 1. FIG. 3 is a plan view of the upper winding section 24 in FIG. 2, viewed from above. As shown in FIGS. 2 and 3, the guide shaft 23 is disposed between the pair of side walls 11A, 11B, horizontal to the floor surface 13 and parallel to the winding shaft 21A of the first roll 21, and both ends are attached to the side walls 11A, 11B by bolts or the like. Also, as shown in FIG. 2, the guide shaft 23 is disposed obliquely above the maximum outer circumferential surface of the first roll 21 wound in a roll shape in the upper winding section 24 in the unwinding direction of the strip filter cloth 18 (leftward in FIG. 2).

[0026] As a result, the strip filter cloth 18 unwound from the first roll 21 is sent obliquely upward and hung on the guide shaft 23. As a result, as shown in Figure 2, the lengths of both side edges of the strip filter cloth 18 that contact the guide members 19A, 19B become longer at an angle, which further prevents the strip filter cloth 18 from meandering when unwound and taken up.

[0027] [Schematic configuration of a pair of guide members] Next, the schematic configuration of the pair of guide members 19A, 19B will be described with reference to FIGS. 2 to 5. FIG. 4 is a plan view showing an example of the guide member 19B. FIG. 5 is a front view showing an example of the guide member 19B. As shown in FIG. 3, the pair of guide members 19A, 19B are formed symmetrically with respect to a vertical plane passing through the center of the width of the case 11, and are attached to the inside of each side wall 11A, 11B facing each other, sandwiching the strip-shaped filter cloth 18 unwound from the first roll 21 therebetween. Each guide member 19A, 19B is fixed to each side wall 11A, 11B by a mounting bolt 23A that fixes the guide shaft 23. Each guide member 19A, 19B is made of sheet metal such as stainless steel, synthetic resin, or the like, having a thickness of approximately 1 mm to 3 mm.

[0028] Because the guide members 19A, 19B are configured symmetrically, the configuration of the guide member 19B attached to the side wall 11B will be described with reference to Figures 4 and 5. As shown in Figures 4 and 5, the guide member 19B has a clamping portion 61 that is fitted into the side wall 11B from above to clamp the side wall 11B, a guide portion 62 that abuts against the side edge of the belt-shaped filter cloth 18 to guide it, an attachment portion 63 that is fixed to the side wall 11B, and a connection portion 64. As shown in Figure 5, the clamping portion 61 and the guide portion 62 are set to have approximately the same width in the left-right direction when viewed from the front.

[0029] 4 and 5, the clamping portion 61 has an inner plate portion 61A having a horizontally elongated rectangular shape when viewed from the front, an outer plate portion 61B having a horizontally elongated rectangular shape when viewed from the front and facing the inner plate portion 61A, and a top plate portion 61C connecting the upper end edges of the inner plate portion 61A and the outer plate portion 61B. The inner plate portion 61A and the outer plate portion 61B are spaced apart by a distance approximately equal to the thickness of the side wall 11B, and the clamping portion 61 is formed in the shape of a rectangular groove in cross section that is open downward.

[0030] The guide portion 62 has a parallel portion 62A that is longer in the up-down direction than the clamping portion 61 and has a vertically elongated rectangular shape in a front view, and a pair of inclined portions 62B that extend obliquely outward from both vertically aligned edge portions of the parallel portion 62A. The inclined portion 62B of the guide portion 62 on the opposite side of the mounting portion 63 is connected to the side edge of the inner plate portion 61A of the clamping portion 61 on the first roll 21 side via a connecting portion 64 that is substantially semicircular in a plan view.

[0031] The parallel portion 62A is arranged substantially parallel to the inner plate portion 61A of the clamping portion 61, and has a surface parallel to the unwinding direction and the winding direction of the strip filter cloth 18. The pair of inclined portions 62B are inclined obliquely outward from the side edges on both sides in the unwinding direction of the strip filter cloth 18. Furthermore, as shown in Fig. 3, the parallel portion 62A is arranged to extend a predetermined length L1 inward in the width direction of the strip filter cloth 18 beyond the side edges of the strip filter cloth 18 when the strip filter cloth 18 is being unwound or wound.

[0032] 4 and 5, the mounting portion 63 extends outward a predetermined distance along the side wall 11B from the side edge opposite the connecting portion 64 of the outer plate portion 61B of the clamping portion 61, i.e., from the side edge on the unwinding direction side of the belt-shaped filter cloth 18, in a rectangular shape when viewed from the front. The mounting portion 63 has a mounting groove 63A cut out in a horizontal U-shape from the vertical center of the outer side edge in the extending direction toward the clamping portion 61, into which the threaded portion of the mounting bolt 23A (see FIG. 3) can be inserted.

[0033] The attachment of the pair of guide members 19A, 19B configured as described above to the side walls 11A, 11B will be described with reference to Figures 2 and 3. As shown in Figures 2 and 3, the clamping portions 61 of the guide members 19A, 19B are fitted into the side walls 11A, 11B from above. Then, the threaded portions of the mounting bolts 23A are inserted into the mounting grooves 63A of the mounting portions 63 of the guide members 19A, 19B and fastened to both ends of the guide shaft 23 for fixation. As a result, as shown in Figure 3, the parallel portions 62A of the pair of guide members 19A, 19B are positioned a predetermined length L1 inward in the width direction from both side edges of the strip filter cloth 18 when the strip filter cloth 18 is being unwound or wound.

[0034] As described above in detail, in the drum-type filtration device 1 according to this embodiment, the pair of guide members 19A, 19B are attached to the pair of side walls 11A, 11B and disposed near the upper winding section 24. The pair of guide members 19A, 19B press both side edges of the unwound or wound-up strip filter cloth 18 inward in the width direction perpendicular to the unwound and wound-up directions of the strip filter cloth 18. This prevents the strip filter cloth 18 from meandering when the strip filter cloth 18 is unwound or wound by the upper winding section 24, and also prevents the strip filter cloth 18 from meandering when moving forward or backward.

[0035] The guide shaft 23 is disposed horizontally relative to the floor surface 13. The pair of guide members 19A, 19B are disposed between the guide shaft 23 and the upper winding section 24 in the unwinding direction of the strip filter cloth 18. This prevents the strip filter cloth 18 from shifting left and right when moving forward or backward, further preventing the strip filter cloth 18 from meandering.

[0036] Furthermore, the guide shaft 23 is disposed diagonally above the outermost peripheral surface of the first roll 21 wound in a roll shape around the upper winding section 24 in the unwinding direction of the strip filter cloth 18. This makes the lengths of both side edges of the strip filter cloth 18 that come into contact with the guide members 19A, 19B longer at an angle, further preventing the strip filter cloth 18 from meandering when unwinding and winding.

[0037] The pair of guide members 19A, 19B also have a parallel portion 62A having a surface parallel to the unwinding direction of the strip filter cloth 18, and a pair of inclined portions 62B inclined obliquely outward from both side edges of the parallel portion 62A in the unwinding direction of the strip filter cloth 18. This allows each guide member 19A, 19B to smoothly guide the strip filter cloth 18 when unwinding and taking up the strip filter cloth 18.

[0038] Furthermore, when the strip filter cloth 18 is being unwound or wound, the parallel portions 62A of the pair of guide members 19A, 19B are positioned a predetermined length L1 inward in the width direction from both side edges of the strip filter cloth 18. This allows the both side edges of the strip filter cloth 18, which are wet with coolant or the like, to be pushed inward and reliably guided when the strip filter cloth 18 is being wound up. As a result, the strip filter cloth 18 can be prevented from meandering when the upper winding section 24 unwinds or winds up the strip filter cloth 18.

[0039] [Variations] A modification of the above embodiment will be described. In the following description, for the sake of convenience, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0040] [Variation 1] For example, instead of the pair of guide members 19A, 19B, a pair of guide members 71A, 71B may be attached to the pair of side walls 11A, 11B. The pair of guide members 71A, 71B have guide portions 62 that extend a predetermined distance above the upper ends of the side walls 11A, 11B, and have adjustment mechanisms 72 that adjust the distance that the parallel portions 62A of the guide portions 62 move inward in the width direction from both side edges of the belt-shaped filter cloth 18.

[0041] The pair of guide members 71A, 71B are formed symmetrically with respect to a vertical plane passing through the center of the width direction of the case 11, and are attached to the inside of each side wall 11A, 11B facing each other with the band-shaped filter cloth 18 unwound from the first roll 21 sandwiched between them. Therefore, the pair of guide members 71A, 71B are configured symmetrically, and the configuration of the guide member 71B attached to the side wall 11B will be described with reference to Figures 6 to 8. Figure 6 is a perspective view showing an example of the guide member 71B according to Modification 1. Figure 7 is a plan view showing an example of the operation of the guide member 71B. Figure 8 is a side view showing an example of the operation of the guide member 71B.

[0042] 6 to 8, the guide member 71B has a fixing portion 75 that is inverted L-shaped in a side view and is fixed to the outer surface of the side wall 11B, and a sliding portion 77 that is a generally rectangular plate in a plan view and is fixed to the upper surface of the fixing portion 75 by two fixing bolts 76. The tip of the sliding portion 77 on the side of the strip-shaped filter cloth 18 is formed in a trapezoidal shape in a plan view and is fixed approximately vertically to the back surface of the guide portion 62 by welding or the like. In addition, a reinforcing rib 78 that is triangular in a side view is fixed between the back surface of the parallel portion 62A of the guide portion 62 and the upper surface of the sliding portion 77 by welding or the like.

[0043] The fixing part 75 is a plate part that abuts against the outer surface of the side wall 11B, and the mounting part 63 extends outward a predetermined length along the side wall 11B from the side edge on the unwinding direction side of the strip filter cloth 18. Furthermore, the fixing part 75 has a pair of through holes on the upper surface, through which two fixing bolts 76 are inserted, that are arranged parallel to the unwinding direction of the strip filter cloth 18, and nuts 81 are fixed to the lower ends of the pair of through holes by welding or the like.

[0044] When the slide portion 77 is placed on the upper surface of the fixing portion 75, a pair of elongated holes 82 parallel to the width direction of the strip filter cloth 18 are formed at positions facing the respective nuts 81. The pair of elongated holes 82 are formed so that the threaded portions of the fixing bolts 76 can be inserted through them. The length of the slide portion 77 in the width direction of the strip filter cloth 18, i.e., in the sliding direction, is set to be longer than the length of the upper surface of the fixing portion 75 in the width direction of the strip filter cloth 18.

[0045] 7 and 8 , each elongated hole 82 is configured so that when the threaded portion of each fixing bolt 76 abuts against the end of each elongated hole 82 facing the strip filter cloth 18 and the fixing bolt 76 is fastened to the nut 81, the parallel portion 62A of the guide portion 62 contacts the side edge of the strip filter cloth 18. Each elongated hole 82 is configured so that when the threaded portion of each fixing bolt 76 abuts against the end of each elongated hole 82 opposite the strip filter cloth 18 and the fixing bolt 76 is fastened to the nut 81, the inclined portion 62B of the guide portion 62 is positioned more inward in the width direction of the strip filter cloth 18 than the side edge of the strip filter cloth 18. Therefore, the adjustment mechanism 72 is made up of the fixing portion 75, the nut 81, the fixing bolt 76, and the slide portion 77.

[0046] The attachment of the pair of guide members 71A, 71B configured as described above to the respective side walls 11A, 11B will be described with reference to Figures 6 to 8. As shown in Figures 6 to 8, attachment bolts 23A are inserted into attachment grooves 63A of attachment portions 63 of each fixing portion 75 and fastened to both ends of the guide shaft 23 so that the upper surfaces of the fixing portions 75 of each guide member 71A, 71B are at the same height as the upper ends of the respective side walls 11A, 11B.

[0047] Then, each slide portion 77 is placed on the upper surface of each fixed portion 75, and the parallel portion 62A of the guide portion 62 is positioned at a position that is indented a predetermined length L1 inward in the width direction from both side edges of the strip filter cloth 18. Next, two fixing bolts 76 are inserted into the pair of elongated holes 82 of each slide portion 77 and fastened to nuts 81 attached to the underside of each fixed portion 75, thereby fixing the slide portion 77 to the upper surface of the fixed portion 75. As a result, as shown in Fig. 6, each parallel portion 62A of the pair of guide members 71A, 71B is positioned at a position that is indented a predetermined length L1 inward in the width direction from both side edges of the strip filter cloth 18 when the strip filter cloth 18 is being unwound or wound.

[0048] As explained in detail above, the pair of guide members 71A, 71B according to the first modification press the opposite side edges of the unwound or wound strip filter cloth 18 inward in the width direction perpendicular to the unwound and wound directions of the strip filter cloth 18. As a result, the pair of guide members 71A, 71B achieve the same effects as the pair of guide members 19A, 19B according to the above embodiment.

[0049] Furthermore, even when a belt-shaped filter cloth 18 having a different width or material is attached to the pair of guide members 71A, 71B, the adjustment mechanism 72 can adjust the positions at which the parallel portions 62A of the pair of guide members 71A, 71B extend inward in the width direction from both side edges of the belt-shaped filter cloth 18. This allows the guide portions 62 of the pair of guide members 71A, 71B to push both side edges of the belt-shaped filter cloth 18, which is wet with coolant or the like, inward and reliably guide it. As a result, meandering of the belt-shaped filter cloth 18 can be prevented when the upper winding section 24 unwinds and winds the belt-shaped filter cloth 18.

[0050] [Variation 2] Furthermore, for example, each of the guide members 19A, 19B, 71A, and 71B may be attached to each of the side walls 11A and 11B by bolting using bolts different from the mounting bolt 23A. Note that each of the guide members 19A, 19B, 71A, and 71B may be attached to each of the side walls 11A and 11B by means other than bolting, such as welding or adhesive. This allows each of the guide members 19A, 19B, 71A, and 71B to be attached to each of the side walls 11A and 11B closer to the upper reel-up section 24.

[0051] [summary] The drum-type filtration device of the first embodiment includes a case having a front wall, a rear wall, and a pair of side walls connecting the front wall and the rear wall, a drum rotatably supported by a drum support shaft having both ends attached to the pair of side walls, a filter feeding device having an endless annular mesh belt disposed below the drum along the outer periphery of the drum, a longitudinal belt-shaped filter cloth sandwiched between the mesh belt and the drum and fed by the filter feeding device, and a filter roller disposed above the drum to feed the wound belt-shaped filter cloth to the filter. The filter apparatus comprises an upper winding section which unwinds the strip filter cloth to be fed to the feeding device and winds up the strip filter cloth, a lower winding section which is positioned downstream of the filter feeding device in the conveying direction of the strip filter cloth and winds up the strip filter cloth fed from the filter feeding device and unwinds the strip filter cloth, and a pair of guide members which are attached to the pair of side walls and positioned near the upper winding section and which press both side edges of the unwound or wound strip filter cloth inward in the width direction perpendicular to the unwound and winding directions of the strip filter cloth.

[0052] The second aspect is a drum-type filtration device of the first aspect, which is provided with a guide shaft arranged in the unwinding direction of the strip filter cloth of the upper winding section and which guides the strip filter cloth, the guide shaft being arranged horizontally relative to the floor surface, and the pair of guide members being arranged between the guide shaft and the upper winding section in the unwinding direction.

[0053] The third aspect is a drum-type filtration device of the second aspect, in which the guide shaft is positioned diagonally above the maximum outer peripheral surface of the strip filter cloth wound in a roll shape around the upper winding section in the unwinding direction of the strip filter cloth.

[0054] A fourth aspect is a drum-type filtration device according to any one of the first to third aspects, wherein the pair of guide members have a parallel portion having a surface parallel to the unwinding direction of the strip filter cloth, and a pair of inclined portions that slope diagonally outward from the side edges of the parallel portion on both sides in the unwinding direction of the strip filter cloth.

[0055] A fifth aspect is a drum-type filtration device of the fourth aspect, in which the parallel portions of the pair of guide members are positioned at a position that is a predetermined length inward in the width direction from both side edges of the strip filter cloth when the strip filter cloth is being unwound or wound up.

[0056] A sixth aspect is a drum-type filtration device according to the fourth or fifth aspect, wherein the pair of guide members have an adjustment mechanism for adjusting the distance that the parallel portions move from both side edges of the belt-shaped filter cloth toward the inside in the width direction.

[0057] [Additional Notes] The present disclosure is not limited to the above-described embodiments, 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 disclosure. [Explanation of symbols]

[0058] 1: Drum type filtration device 11: Case 11A, 11B: Side wall 11C: Front wall 11D: Back wall 13:Floor 18: Belt-shaped filter cloth 19A, 19B, 71A, 71B: Guide members 23: Guide shaft 24: Upper winding section 27: Lower winding section 31: Drum support shaft 36: Drums 38: Mesh belt 41: Filter feeder 62A: Parallel section 62B: Inclined part 72: Adjustment mechanism

Claims

1. a case having a front wall, a rear wall, and a pair of side walls connecting the front wall and the rear wall; a drum in which a pair of circular members are rotatably supported by a cylindrical drum support shaft, both ends of which are attached to the pair of side walls, and are connected to each other via a connecting member of a predetermined length, and contaminated fluid that has flowed into the drum support shaft flows into the drum through a discharge port formed in the drum support shaft; a filter feeding device that has an endless circular mesh belt that is disposed below the drum and that runs along half of the outer periphery of the lower side of the pair of circular members, and that rotates the mesh belt and the drum; a longitudinal belt-shaped filter cloth that is sandwiched between the mesh belt and the drum in a semicircular shape and sent by the filter sending device to filter the contaminated liquid downward; an upper winding section disposed above the drum, which unwinds the wound filter cloth to the filter feeding device and winds up the filter cloth; a lower winding section disposed downstream of the filter feeding device in the conveying direction of the belt-shaped filter cloth, for winding up the belt-shaped filter cloth fed from the filter feeding device and unwinding the belt-shaped filter cloth; a pair of guide members attached to the pair of side walls and disposed near the upper winding section, for pressing both side edges of the unwound or wound-up belt-shaped filter cloth inward in a width direction perpendicular to the unwound and winding directions of the belt-shaped filter cloth; A drum-type filtration device equipped with

2. a guide shaft disposed in the unwinding direction of the belt-shaped filter cloth of the upper winding section and guiding the belt-shaped filter cloth; The upper winding section has a winding shaft of a first roll around which one end of the belt-shaped filter fabric is wound, the guide shaft is disposed horizontally between the pair of side walls and parallel to the winding axis of the first roll, The pair of guide members are disposed between the guide shaft and the upper winding section in the unwinding direction. The drum-type filtration device according to claim 1.

3. The guide shaft is disposed obliquely above the maximum outer peripheral surface of the belt-shaped filter cloth wound in a roll shape on the upper winding section in the unwinding direction of the belt-shaped filter cloth. The drum-type filtration device according to claim 2.

4. The pair of guide members are a parallel portion having a surface parallel to the unwinding direction of the belt-shaped filter cloth; a pair of inclined portions inclined obliquely outward from the side edges of the parallel portion on both sides in the unwinding direction of the belt-shaped filter cloth; The drum-type filtration device according to any one of claims 1 to 3, comprising:

5. The parallel portions of the pair of guide members are arranged at positions that are inward in the width direction by a predetermined length from both side edges of the belt-shaped filter cloth when the belt-shaped filter cloth is being unwound or wound. The drum-type filtration device according to claim 4.

6. The pair of guide members are an adjustment mechanism for adjusting the distance that the parallel portions move from both side edges of the belt-shaped filter fabric toward the inside in the width direction; The drum-type filtration device according to claim 5.

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