Drum-type filtration device using strip-shaped filter media

Abstract

To provide a drum type filter device using a belt shape filter medium where the maintenance frequency of the belt shape filter medium can be reduced and environmental load caused by the waste of sludge and the belt shape filter medium can be reduced.SOLUTION: In a sludge deliquoring separator 22,: a belt shape filter medium 46 can be repeatedly used for filtration by the forward movement and backward movement of the longitudinal belt shape filter medium 46; then, the belt shape filter medium 46 having a long total length can be used, filtration efficiency can be maintained and the maintenance frequency of the belt shape filter medium 46 can be reduced; and environmental load caused by the waste of sludge SG and the belt shape filter medium 46 can be reduced since the deliquoring of the sludge SG and the belt shape filter medium 46 is performed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drum-type filtration device that has a band-shaped filter material that is continuously fed along the lower half of the drum, and removes foreign matter contained in the coolant by passing used coolant (dirty liquid) through the band-shaped filter material. [Background technology]

[0002] In machining of grinding machines, cutting machines, etc. used in manufacturing automobile parts, bearings, etc., a drum-type filtration device using a band-shaped filter material has been proposed in which dirty coolant (dirty liquid) used in machining or grinding is passed through a band-shaped filter material that is continuously fed along the lower half of the drum, thereby removing foreign matter from the dirty liquid to obtain a purified clean liquid that can be reused. For example, a drum-type filtration device using a band-shaped filter material is shown in Figures 1 to 9 of Patent Document 1.

[0003] The drum-type filtration device using the above-mentioned strip filter material includes a pair of circular members fixed at a predetermined interval to a rotatable horizontal support shaft, a filter material feeding device having an endless annular mesh belt that runs along the lower half of the pair of circular members, and strip filter material that is continuously fed while being sandwiched between the mesh belt and each of the circular members.The strip filter material is fed in the circumferential direction together with the pair of circular members and the mesh belt, while the dirty liquid is passed through the strip filter material to obtain purified coolant (clean liquid).

[0004] In the drum-type filtration device using a belt-shaped filter material shown in Fig. 1 to Fig. 9 of Patent Document 1, the belt-shaped filter material for filtering the dirty liquid is drawn out from a roll on which unused belt-shaped filter material is wound, and is continuously sent while being sandwiched between a mesh belt and each circular member, and then the used belt-shaped filter material is collected in a collection box. However, since this belt-shaped filter material is disposable, there are problems in that the operating cost of the drum-type filtration device is high and the environmental load caused by disposing of the used belt-shaped filter material is large. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-314703 A Summary of the Invention [Problem to be solved by the invention]

[0006] In response to this, Fig. 10 of Patent Document 1 proposes a drum-type filtration device using an endless annular (endless) belt-shaped filter medium, which can reduce the operating costs of the drum-type filtration device and reduce the environmental impact caused by disposing of the used belt-shaped filter medium. This drum-type filtration device is equipped with a scraper or brush roll for continuously scraping the filtered sludge off the belt-shaped filter medium.

[0007] However, since the sludge on the band filter material contains a large amount of liquid components and is relatively soft in nature, when the sludge is scraped off from the band filter material using a scraper or brush roll, a large portion of the sludge is left behind on the band filter material.If the band filter material is moved in this state and the coolant is filtered again, the filtration efficiency of the drum-type filtration device will decrease.This, combined with the short overall length of the band filter material, results in problems such as more frequent maintenance of the band filter material, and the disposal of sludge containing a large amount of liquid components and endless ring-shaped band filter material places a large burden on the environment.

[0008] The present invention has been made against the background of the above circumstances, and its object is to provide a drum-type filtration device using a strip filter material that can reduce the frequency of maintenance of the strip filter material and reduce the environmental burden caused by the disposal of sludge and strip filter material. [Means for solving the problem]

[0009] The inventors of the present invention have conducted various studies on drum-type filtration devices based on the above circumstances, and have found that by pressing the sludge adhering to one side of the belt-shaped filter medium to remove the liquid and make the sludge into a cake, the sludge can be easily peeled off from the belt-shaped filter medium, and thus, repeated filtration can be performed by moving the longitudinal belt-shaped filter medium forward and backward.The present invention has been made based on this knowledge.

[0010] That is, the gist of the first invention is a drum-type filtration device using a strip filter material, the device comprising: (a) a drum in which a pair of circular members rotatably supported by a horizontal drum support shaft are connected to each other via a connecting member of a predetermined length; a filter feeding device having an endless annular mesh belt that is fitted along half of the lower outer periphery of the pair of circular members; a longitudinal strip filter material sandwiched between the mesh belt and the pair of circular members and fed by the filter feeding device; and a sludge deliquor separation device that continuously separates sludge adhering to the outer periphery of the strip filter material fed from the filter feeding device, (b) the filter feeding device includes a liquid level sensor that detects the level of dirty liquid remaining on the strip filter material in the drum; The mesh belt is wound around a driving roller, which is driven to rotate. and a motor control device that drives the motor to feed the strip filter material so that the liquid level detected by the liquid level sensor reaches a preset liquid level height. (c) When the feed amount of the strip filter material reaches a preset feed amount, the filter feed device retracts the strip filter material in the opposite direction and feeds it again. (d) the filter feeding device includes a first torque motor that applies a constant torque to a first roll around which one end of the belt-shaped filter material is wound, the constant torque generating tension in the belt-shaped filter material, and a second torque motor that applies a constant torque to a second roll around which the other end of the belt-shaped filter material is wound, the constant torque generating tension in the belt-shaped filter material. The point is... Effect of the Invention

[0011] According to the drum-type filtration device using the belt-shaped filter medium of the present invention, the sludge deliquification and separation device can use the belt-shaped filter medium for repeated filtration by advancing and retreating the longitudinal belt-shaped filter medium. This allows the use of a belt-shaped filter medium with a long overall length, while maintaining the filtering efficiency, thereby reducing the frequency of maintenance of the belt-shaped filter medium. In addition, the filter feed device adjusts the liquid level detected by the liquid level sensor to a preset liquid level height. The mesh belt is wound around a driving roller, which is driven to rotate. Since the motor control device includes a motor control device that drives an electric motor to feed the belt-shaped filter material, the belt-shaped filter material is fed without excess or deficiency, thereby suppressing wear of the belt-shaped filter material. Furthermore, the filter feeding device includes a first torque motor that applies a constant torque to a first roll around which one end of the strip filter material is wound, generating tension in the strip filter material, and a second torque motor that applies a constant torque to a second roll around which the other end of the strip filter material is wound, generating tension in the strip filter material.Therefore, the longitudinal strip filter material is fed from the filter feeding device to the sludge deliquescence separation device with a constant tension applied, thereby suppressing slackening of the strip filter material.

[0014] where Preferably, the filter feeder retracts the band filter medium so that the portion of the band filter medium from which sludge has been removed by the sludge deliquing and separating device is wound around the first roll, and then unwinds the portion of the band filter medium wound around the first roll from which sludge has been removed by the sludge deliquing and separating device, and advances the band filter medium again so that it is wound around the second roller via the sludge deliquing and separating device. This allows the band filter medium to be used multiple times to filter the coolant, making it possible to lengthen the replacement cycle of the band filter medium and reduce the frequency of maintenance of the band filter medium.

[0015] Also, preferably, the sludge deliquification separation device is provided with a clamping roller that continuously clamps the sludge accumulated on one side of the belt-shaped filter medium sent from the filter feed device. As a result, the sludge is deliquified by the clamping roller that continuously clamps the sludge accumulated on the outer peripheral surface of the belt-shaped filter medium sent from the filter feed device, so that the sludge is easily peeled off from the belt-shaped filter medium. In addition, since the sludge and belt-shaped filter medium are deliquified by the clamping roller, the environmental load caused by the disposal of the sludge and belt-shaped filter medium is reduced.

[0016] Preferably, the sludge deliquification separation device is provided at a downstream position of the clamping roller in the moving direction of the belt-shaped filter medium delivered from the filter feed device, and includes a rotating brush for separating the cake-like sludge adhered to the outer peripheral surface of the belt-shaped filter medium after deliquification from the belt-shaped filter medium. Thus, the cake-like sludge adhered to the outer peripheral surface of the belt-shaped filter medium after deliquification is separated by the rotating brush.

[0017] Preferably, the sludge deliquification separation device is provided with a jet nozzle that is provided downstream of the rotating brush in the moving direction of the belt-shaped filter medium and separates the deliquified sludge adhering to the outer peripheral surface of the belt-shaped filter medium by jetting a fluid from the inner peripheral surface of the belt-shaped filter medium. Thus, the deliquified sludge adhering to the outer peripheral surface of the belt-shaped filter medium is separated from the belt-shaped filter medium by jetting a fluid from the inner peripheral surface of the belt-shaped filter medium by the jet nozzle.

[0018] Also, preferably, the sludge deliquification separation device is provided with a guide roller that turns the belt-shaped filter material sent from the filter feed device and guides it in an acute angle direction, the pressure roller is provided at the upstream side of the guide roller, and the rotating brush and the spray nozzle are provided at the downstream side of the guide roller. As a result, before the belt-shaped filter material reaches the guide roller, the sludge attached to the outer peripheral surface of the belt-shaped filter material is deliquified by the pressure roller and made into a cake shape. Also, because the belt-shaped filter material turns during the process of passing through the guide roller, cracks are formed in the sludge, and the peeling efficiency of the sludge from the belt-shaped filter material by the rotating brush and the spray nozzle is improved. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram illustrating the configuration of a drum-type filtration device using a belt-shaped filter material according to one embodiment of the present invention, using a cross-sectional view thereof. [Diagram 2] FIG. 11 is a schematic cross-sectional view illustrating the configuration of a sludge deliquor separation device for a drum-type filtration device using a belt-shaped filter material according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that in the following embodiments, the drawings are schematic diagrams that have been appropriately simplified or modified, and the dimensional ratios and shapes of the various parts are not necessarily drawn accurately. EXAMPLES

[0021] Fig. 1 is a side view of a drum-type filtration device (hereinafter, referred to as filtration device) 10 using a belt-shaped filter medium according to an embodiment of the present invention, and is a schematic diagram showing a cross section cut along a vertical plane passing through the center in the width direction of the filtration device 10. In Fig. 1, the filtration device 10 is provided on a clean tank 14 that stores purified coolant, i.e., clean liquid CF, and includes a case 12 having a front wall 12c, a rear wall 12d, a pair of side walls 12a and 12b connecting the front wall 12c and the rear wall 12d, an upper wall 12e that closes from above the opening of the space surrounded by the front wall 12c, the rear wall 12d, and the pair of side walls 12a and 12b, and a bottom wall 12f.

[0022] A notch 16 is formed in the end of the bottom wall 12f on the rear wall 12d side, and a sludge storage container 18 that opens upward and stores sludge SG is disposed below the notch 16. A partition wall 12g is provided within the case 12 to divide the interior of the case 12 into a front space S1 that stores the drum 36, the filter feed device 40, etc., and a rear space S2 that stores the sludge deliquescence separation device 22.

[0023] The filtration device 10 includes a cylindrical drum support shaft 30 suspended horizontally between the pair of side walls 12a, 12b to rotatably support the drum 36, the drum 36 including a pair of circular members 32 rotatably supported by the drum support shaft 30 and connected to each other via a longitudinal connecting member 34 of a predetermined length in a state in which they face each other at a fixed interval, and a filter feed device 40 including an endless annular mesh belt 38 running 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 30.

[0024] In the front space S1 of the case 12, a cylindrical first roll 24 around which one end of a belt-shaped filter material 46 of a predetermined width that functions as a belt-shaped filter is wound is rotatably supported by the side walls 12a and 12b. In the rear space S2 of the case 12, a cylindrical second roll 26 around which the other end of the belt-shaped filter material 46 is wound is rotatably supported by the side walls 12a and 12b. The filter feed device 40 includes a first torque motor TM1 that applies a constant torque to the first roll 24 to generate tension in the belt-shaped filter material 46, and a second torque motor TM2 that applies a constant torque to the second roll 26 to generate tension in the belt-shaped filter material 46. As a result, the longitudinal belt-shaped filter material 46 is unwound from the first roll 24 with a constant tension applied, and is wound around the second roll 26 from the filter feed device 40 via the sludge deliquor separation device 22, thereby suppressing slack.

[0025] The filter feed device 40 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 for rotating the drive roller 42. When the drive roller 42 is rotated, the endless circular mesh belt 38 and the drum 36 are rotated. As a result, the strip filter material 46 unwound from the first roll 24 is sandwiched in a semicircular shape between the mesh belt 38 and the pair of circular members 32, and then sent from the filter feed device 40 to the second roll 26 via the sludge deliquor separation device 22. The longitudinal strip filter material 46 is a strip filter made of a filter material such as nonwoven fabric, woven fabric, or filter paper. The mesh belt 38 is a mesh made of a metal mesh, synthetic fiber, carbon fiber, or composite material having a large number of meshes.

[0026] Of the three driven rollers 44a, 44b, and 44c, the driven roller 44c is positioned at a height equal to or greater than that of the driving 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 located at a position a predetermined distance below the drum 36, and are positioned at a predetermined distance apart in the horizontal direction. The belt-shaped filter medium 46 sent from the filter feeding device 40 to the sludge dewatering and separating device 22 is wound around the second roll 26.

[0027] The cylindrical drum support shaft 30 allows the dirty liquid DF discharged from a grinding machine or a grinding wheel using a coolant to flow onto the belt-shaped filter medium 46 within the drum 36. As a result, the dirty liquid DF staying on the belt-shaped filter medium 46 within the drum 36 is passed downward through the belt-shaped filter medium 46, so that sludge SG is deposited on the outer peripheral surface of the belt-shaped filter medium 46.

[0028] The filter feeding device 40 is provided on the drum support shaft 30 and includes a liquid level sensor 48 that detects the liquid level of the dirty liquid DF staying on the belt-shaped filter medium 46 within the drum 36, and a motor control device 50 that controls the rotation of the driving roller 42. The rotation speed of the driving roller 42 by the electric motor M is adjusted so that the liquid level detected by the liquid level sensor 48 becomes a preset liquid level height, and the feeding speed (forward speed) of the belt-shaped filter medium 46 is appropriately controlled.

[0029] When the forward delivery amount of the belt-shaped filter medium 46 toward the sludge dewatering and separating device 22 reaches a preset predetermined delivery amount, the filter feeding device 40 reciprocally drives the belt-shaped filter medium 46 to retreat a predetermined amount in the reverse backward direction and then feed it forward again in the forward direction, so that the belt-shaped filter medium 46 can be used multiple times for filtering the coolant.

[0030] When the belt-shaped filter material 46 reaches a preset position, for example, a position where the number of remaining turns of the belt-shaped filter material 46 unwound from the first roll 24 is zero, the filter feed device 40 stops the inflow of dirty liquid DF from the drum support shaft 30, and moves the belt-shaped filter material 46 backward, for example, to a position where the number of remaining turns of the belt-shaped filter material 46 on the second roll 26 is zero, until the portion of the belt-shaped filter material 46 from which sludge has been removed by the sludge deliquification separation device 22 is wound onto the first roll 24. Next, with the inflow of dirty liquid DF from the drum support shaft 30 resumed, the filter feed device 40 unwinds the portion of the belt-shaped filter material 46 wound around the first roll 24 from which sludge has been removed by the sludge deliquification separation device 22, and moves the belt-shaped filter material 46 forward again so that it is wound around the second roller 26 via the sludge deliquification separation device 22. The filter feed device 40 then repeats such forward and backward movements of the belt-shaped filter material 46. As a result, the band filter material 46 is used multiple times to filter the coolant, so that the replacement cycle of the band filter material 46 is extended and the frequency of maintenance of the band filter material 46 is reduced.

[0031] The sludge deliquescence separation device 22 comprises a pair of clamping rollers 52 that continuously clamp the sludge SG accumulated on the outer peripheral surface of the strip filter material 46 sent out in an approximately horizontal direction from the filter feeding device 40 in the rear space S2, a pair of guide rollers 54 and 56 that are located diagonally below the clamping roller 52 and spaced a predetermined distance apart in the vertical direction, a rotating brush 58 that separates the sludge SG accumulated on the outer peripheral surface of the strip filter material 46 located between the pair of guide rollers 54 and 56, which is in the form of a cake after being deliquified by the clamping roller 52, from the outer peripheral surface of the strip filter material 46, and a spray nozzle 60 that separates the sludge SG adhering to the outer peripheral surface of the strip filter material 46 by spraying air or a fluid such as coolant from the inner peripheral surface of the strip filter material 46 at a position downstream of the rotating brush 58. The clean liquid CF that falls from the pressing roller 52 through the belt-shaped filter medium 46 due to the pressing of the sludge SG on the outer circumferential surface of the belt-shaped filter medium 46 is made to flow into the clean tank 14 via the clean liquid guide inclined plate 64 .

[0032] In order to clamp the belt-shaped filter medium 46 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 has an elastic member made of a material that is elastically deformable in the radial direction, such as synthetic rubber. Alternatively, a roller biasing mechanism is provided that biases one bearing of the pair of clamping rollers 52 toward the other bearing.

[0033] As described above, according to the filtering device 10 of this embodiment, the sludge deliquescence separation device 22 can use the longitudinal strip filter material 46 for repeated filtration by advancing and retracting the strip filter material 46. This allows the strip filter material 46 to have a long overall length and maintains the filtering efficiency, thereby reducing the frequency of maintenance of the strip filter material 46.

[0034] The filtering device 10 of this embodiment includes a liquid level sensor 48 that detects the level of the dirty liquid DF remaining on the strip filter medium 46 in the drum 36, a feed motor M that feeds the strip filter medium 46, and a motor control device 50 that drives the feed motor M to feed the strip filter medium 46 so that the level of the dirty liquid DF detected by the liquid level sensor becomes a preset liquid level height. As a result, the strip filter medium 46 is fed without excess or deficiency so that the liquid level of the remaining dirty liquid DF is maintained, and the filtering efficiency of the strip filter medium 46 is maintained high while the strip filter medium 46 is fed without excess or deficiency.

[0035] According to the filtration device 10 of this embodiment, the filter feed device 40 includes a first torque motor TM1 that applies a constant torque to the first roll 24 around which one end of the belt-shaped filter medium 46 is wound, which generates tension on the belt-shaped filter medium 46, and a second torque motor TM2 that applies a constant torque to the second roll 26 around which the other end of the belt-shaped filter medium 46 is wound, which generates tension on the belt-shaped filter medium 46. As a result, the longitudinal belt-shaped filter medium 46 is sent from the filter feed device 40 to the sludge deliquor separation device 22 with a constant tension applied to it. As a result, slackness of the belt-shaped filter medium 46 is suppressed.

[0036] Furthermore, according to the filtration device 10 of this embodiment, the filter feed device 40 moves the band filter medium 46 backward so that the portion of the band filter medium 46 from which the sludge SG has been removed by the sludge deliquescence separation device 22 is wound around the first roll 24, and then unwinds the portion of the band filter medium 46 wound around the first roll 24 from which the sludge SG has been removed by the sludge deliquescence separation device 22, and moves the band filter medium 46 forward again so that it is wound around the second roller 26 via the sludge deliquescence separation device 22. As a result, the band filter medium 46 is used multiple times to filter the coolant, so that the replacement cycle of the band filter medium 46 is extended, and the frequency of maintenance of the band filter medium 46 can be reduced.

[0037] The sludge deliquification separation device 22 of this embodiment also includes a clamping roller 52 that continuously clamps the sludge SG accumulated on one side of the band-shaped filter medium 46 delivered from the filter feed device 40. As a result, the sludge SG is deliquified by the clamping roller 52 that continuously clamps the sludge SG accumulated on the outer peripheral surface of the band-shaped filter medium 46 delivered from the filter feed device 40, making it easier to peel the sludge SG from the band-shaped filter medium 46, and since the sludge SG and band-shaped filter medium 46 have been deliquified, the environmental load caused by the disposal of the sludge SG and band-shaped filter medium 46 can be reduced.

[0038] The sludge deliquification and separation device 22 of this embodiment is provided at a position downstream of the clamping roller 52 in the moving direction of the strip filter material 46 delivered from the filter feed device 40, and includes an electric rotating brush 58 that separates the cake-like sludge SG after deliquification that has adhered to the outer peripheral surface of the strip filter material 46 from the strip filter material 46. This allows the cake-like sludge SG after deliquification that has adhered to the outer peripheral surface of the strip filter material 46 to be suitably separated by scratching with the bristles of the rotating brush 58.

[0039] The sludge deliquification separation device 22 of this embodiment is provided with a jet nozzle 60 that is provided downstream of the rotating brush 58 in the moving direction of the band-shaped filter medium 46 and separates the deliquified sludge SG adhering to the outer peripheral surface of the band-shaped filter medium 46 by jetting a fluid from the inner peripheral surface of the band-shaped filter medium 46. As a result, the deliquified sludge SG adhering to the outer peripheral surface of the band-shaped filter medium 46 is separated from the band-shaped filter medium 46 by the jet nozzle 60 jetting a fluid from the inner peripheral surface of the band-shaped filter medium 46.

[0040] Furthermore, according to the filtration device 10 of this embodiment, it is not necessary to provide a gutter member below the drum 36 for receiving the clean liquid CF that has passed downward through the belt-shaped filter material 46 and the dirty liquid DF that has accumulated on the belt-shaped filter material 46 inside the drum 36. This makes it possible to make the filtration device 10 compact.

[0041] Furthermore, according to the filtering device 10 of this embodiment, a sludge storage container 18 that opens upward is disposed below the sludge deliquescence separation device 22 for receiving the sludge SG that is separated from the strip-shaped filter medium 46 and drops by the rotating brush 58 and the spray nozzle 60. As a result, the sludge SG separated from the strip-shaped filter medium 46 is collected in the sludge storage container 18. EXAMPLES

[0042] A sludge deliquescence separation apparatus 28, which is different from the sludge deliquescence separation apparatus 22, will be described below with reference to the schematic diagram of Fig. 2. In the following description, parts common to the above embodiment will be given the same reference numerals and description thereof will be omitted.

[0043] The main part of the sludge deliquescence separation device 28 of this embodiment is shown in Fig. 2. The sludge deliquescence separation device 28 is provided with a guide roller 80 having a relatively small diameter, for example, 30 mmφ or less, preferably 20 mmφ or less, which guides the belt-shaped filter material 46 by bending it at an acute bending angle α during the process in which the belt-shaped filter material 46 sent out from the driving roller 42 of the filter feed device 40 is wound around the second roller 26 through the sludge deliquescence separation device 28. In the moving direction of the belt-shaped filter material 46, the pinch roller 52 is provided at a position upstream of the guide roller 80, and the rotating brush 58 and the injection nozzle 60 are provided at a position downstream of the guide roller 80. The bending angle α is preferably 60° or less, more preferably 30° or less, since the smaller the bending angle α, the larger the cracks that occur in the sludge SG.

[0044] In the sludge deliquification and separation device 28 of this embodiment, the sludge SG adhering to the outer peripheral surface of the band-shaped filter medium 46 is deliquified by the pressing roller 52 and turned into a cake before the band-shaped filter medium 46 reaches the guide roller 80. Also, because the band-shaped filter medium 46 makes acute turns while passing through the guide roller 80, cracks are formed in the sludge, and the efficiency with which the rotating brush 58 and the spray nozzle 60 peel off the sludge SG from the band-shaped filter medium 46 is improved.

[0045] Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other embodiments.

[0046] For example, the above-mentioned filter feeding device 40 drives the strip filter material 46 back and forth so that the strip filter material 46 can be used multiple times to filter coolant, but the reciprocating drive stroke of the strip filter material 46 does not necessarily have to be the entire length of the strip filter material 46, and may be only a portion of the strip filter material 46 in the longitudinal direction.

[0047] In addition, in the above-described embodiment, a pair of clamping rollers 52 are provided to clamp the band-shaped filter material 46 in order to drain the sludge on the band-shaped filter material 46, but multiple pairs of clamping rollers 52 may be provided.

[0048] In the above-described embodiment, the drum 36 is formed by connecting a pair of circular members 32 with a rod-shaped connecting member 34. However, the circular members 32 may not be disk-shaped, but may be circular members connected by a plurality of radial members fitted between a hub and a ring-shaped member.

[0049] It should be noted that the above is merely one embodiment, and the present invention can be embodied in various modified and improved forms based on the knowledge of those skilled in the art. [Explanation of symbols]

[0050] 10: Filtration device (drum-type filtration device using strip-shaped filter material) 12: Case 14: Clean Tank 18: Sludge storage container 22: Sludge deliquescence separator 24: First roll 26: Second Roll 30: Drum support shaft 32:Circular member 34: Connecting member 36: Drums 38: Mesh belt 40: Filter feed device 42: Drive roller 44a, 44b, 44c: driven rollers 46: Belt-shaped filter material 48: Liquid level sensor 50: Motor control device 52: Clamping roller 54, 56: Guide roller 58: Rotating brush 60: Injection nozzle 64: Clean liquid guide plate SG: Sludge TM1: First torque motor TM2: Second torque motor CF: Clean fluid DF: Dirty fluid

Claims

1. A drum-type filtration device using a strip filter material, comprising: a drum in which a pair of circular members rotatably supported by a horizontal drum support shaft are connected to each other via a connecting member of a predetermined length; a filter feeding device having an endless annular mesh belt that is fitted along half of the lower outer periphery of the pair of circular members; a longitudinal strip filter material that is sandwiched between the mesh belt and the pair of circular members and fed by the filter feeding device; and a sludge deliquor separation device that continuously separates sludge adhering to the outer periphery of the strip filter material fed from the filter feeding device, The filter feed device includes a liquid level sensor that detects the level of the dirty liquid remaining on the belt-shaped filter material in the drum, an electric motor that rotates a drive roller around which the mesh belt is wound, and a motor control device that drives the electric motor to feed the belt-shaped filter material so that the liquid level detected by the liquid level sensor becomes a preset liquid level height. When the amount of the belt-shaped filter medium fed by the filter feed device reaches a preset amount, the filter feed device moves the belt-shaped filter medium backward in the opposite direction and feeds the belt-shaped filter medium again. The filter feeding device includes a first torque motor that applies a constant torque to a first roll around which one end of the belt-shaped filter material is wound, causing tension in the belt-shaped filter material, and a second torque motor that applies a constant torque to a second roll around which the other end of the belt-shaped filter material is wound, causing tension in the belt-shaped filter material. A drum-type filtration device using a belt-shaped filter material.

2. The filter feed device moves the band-shaped filter medium backward so that a portion of the band-shaped filter medium from which sludge has been removed by the sludge deliquing and separating device is wound around the first roll, and then unwinds the portion of the band-shaped filter medium wound around the first roll from which sludge has been removed by the sludge deliquing and separating device, and advances the filter medium forward again so that the portion is wound around the second roll via the sludge deliquing and separating device.

2. A drum-type filtration device using the belt-shaped filter material according to claim 1.

3. The sludge deliquor separation device includes a pressing roller that continuously presses the sludge accumulated on one side of the belt-shaped filter medium sent out from the filter feed device.

2. A drum-type filtration device using the belt-shaped filter material according to claim 1.

4. The sludge deliquification and separation device is provided at a downstream position of the pressing roller in the moving direction of the belt-shaped filter material sent out from the filter feed device, and includes a rotating brush that separates the cake-like sludge adhered to the outer peripheral surface of the belt-shaped filter material after deliquification from the belt-shaped filter material.

4. A drum-type filtration device using the belt-shaped filter material according to claim 3.

5. The sludge deliquification and separation device is provided at a downstream position of the rotating brush in the moving direction of the belt-shaped filter medium, and includes a spray nozzle that separates the deliquified sludge adhering to the outer peripheral surface of the belt-shaped filter medium by spraying a fluid from the inner peripheral surface of the belt-shaped filter medium.

5. A drum-type filtration device using the belt-shaped filter material according to claim 4.

6. The sludge deliquescence separation device includes a guide roller that turns and guides the belt-shaped filter medium delivered from the filter delivery device in an acute angle direction, The pressure roller is provided at a position upstream of the guide roller, The rotating brush and the spray nozzle are provided downstream of the guide roller.

6. A drum-type filtration device using the belt-shaped filter material according to claim 5.

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