JP2024008308A - Drum type filter device using belt shape filter medium - Google Patents

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

The present invention includes a band-shaped filter medium that is continuously fed along the lower half circumference of the drum, and removes foreign substances contained in the coolant by passing the used coolant (dirty liquid) through the band-shaped filter medium. The present invention relates to a drum-type filtration device using a drum-type filtration device.

In the machining of grinders, cutting machines, etc. used in the manufacture of automobile parts, bearings, etc., the band-shaped filter medium that is continuously fed along the lower half of the drum is contaminated after use during machining and grinding. A drum-type filtration device using a band-shaped filter medium has been proposed, which removes foreign substances from the dirty liquid by passing the dirty coolant (dirty liquid) to obtain a clean liquid that can be reused. . For example, a drum-type filter device using a band-shaped filter medium is shown in FIGS. 1 to 9 of Patent Document 1.

The drum-type filtration device using the above band-shaped filter medium includes a pair of circular members fixed at a predetermined interval to a rotatable horizontal support shaft, and an endless annular member extending along the lower half circumference of the pair of circular members. A filter medium feeding device equipped with a mesh belt, and a band-shaped filter medium that is continuously fed while being sandwiched between the mesh belt and each circular member, and the band-shaped filter medium is fed along with the pair of circular members and the mesh belt in the circumferential direction. By passing the dirty liquid through a band-shaped filter medium, purified coolant (clean liquid) can be obtained.

By the way, in the drum type filtration device using the band-shaped filter medium described in FIGS. 1 to 9 of Patent Document 1, the band-shaped filter medium that filters dirty liquid is pulled out from the roll around which the unused band-shaped filter medium is wound. After being continuously fed while being sandwiched between the mesh belt and each circular member, the used band-shaped filter medium is collected into a collection box. However, since this band-shaped filter medium is disposable, there have been problems in that the operating cost of the drum-type filter device is high and that the environmental burden of discarding the used band-shaped filter medium is large.

Japanese Patent Application Publication No. 2001-314703

On the other hand, FIG. 10 of Patent Document 1 shows an endless ring-shaped filtration device that can reduce the operating cost of a drum-type filtration device and reduce the environmental burden caused by disposing of used strip-shaped filter media. A drum-type filtration device using a band-shaped filter medium has been proposed. This drum-type filtration device is equipped with a scraper and a brush roll for continuously scraping filtered sludge from the band-shaped filter medium.

However, the sludge on the band-shaped filter medium contains a large amount of liquid components and is relatively soft, so when scraping the sludge from the band-shaped filter medium using a scraper or brush roll, some of the sludge may Since a lot of the coolant is left behind on the belt-shaped filter medium, if the belt-shaped filter medium moves in that state and filters the coolant again, the filtration efficiency of the drum-type filtration device will decrease. There is a problem that maintenance frequency increases, and that the disposal of sludge containing a large amount of liquid components and endless annular belt-shaped filter media has a large environmental burden.

The present invention was made against the background of the above circumstances, and its purpose is to provide a band-shaped filter medium that can reduce the frequency of maintenance of the band-shaped filter medium and reduce the environmental burden caused by sludge and disposal of the band-shaped filter medium. An object of the present invention is to provide a drum-type filtration device using the present invention.

The inventors of the present invention have conducted various studies on drum-type filtration devices against the background of the above circumstances, and found that if the sludge adhering to one side of the band-shaped filter medium is deliquified by squeezing and the sludge is turned into a cake-like form, the band-shaped filter medium It has been found that the sludge can be easily peeled off from the sludge, thereby making it possible to perform repeated filtration by advancing and retracting the longitudinal strip-shaped filter medium. The present invention has been made based on such knowledge.

That is, the gist of the first invention is as follows: (a) a drum in which a pair of circular members rotatably supported by a horizontal drum support shaft are interconnected via a connecting member of a predetermined length; a filter feeding device including an endless annular mesh belt that runs half a circumference around the lower outer periphery of the pair of circular members; and a filter feeding device that is sandwiched between the mesh belt and the pair of circular members. A belt-shaped filter medium is used, which includes a fed longitudinal belt-shaped filter medium, and a sludge deliquid separation device that continuously separates sludge adhering to the outer peripheral surface of the belt-shaped filter medium sent out from the filter feeding device from the band-shaped filter medium. (b) When the feeding amount of the band-shaped filter medium reaches a predetermined feeding amount set in advance, the filter feeding device retreats the band-shaped filter medium in the opposite direction and sends it out again. be.

According to the drum type filtration device using the band-shaped filter medium of the present invention, the sludge deliquid separation device can use the band-shaped filter medium for repeated filtration by moving the longitudinal band-shaped filter medium forward and backward. Thereby, it is possible to use a belt-shaped filter medium having a long overall length, and the filtration efficiency can be maintained, so that the frequency of maintenance of the belt-shaped filter medium can be reduced.

Here, preferably, the filter feeding device includes a liquid level sensor that detects a liquid level of the dirty liquid remaining on the band-shaped filter medium in the drum, a feed motor that feeds the band-shaped filter medium, and the liquid level. A motor control device that drives the feed motor to feed the band-shaped filter medium so that the liquid level detected by the sensor becomes a preset liquid level height. As a result, the band-shaped filter medium is fed in just the right amount, so that consumption of the band-shaped filter medium is suppressed.

Preferably, the filter feeding device includes a first torque motor that applies a constant torque that generates tension to the band-shaped filter medium to a first roll around which one end of the band-shaped filter medium is wound; and a second torque motor that applies a constant torque that generates tension in the band-shaped filter medium to a second roll around which the other end is wound. As a result, the elongated strip-shaped filter medium is sent from the filter feeding device to the sludge deliquid separation device with a constant tension applied thereto. This suppresses loosening of the band-shaped filter medium.

Preferably, the filter feeding device retreats the band-shaped filter medium so that a portion of the band-shaped filter medium from which sludge has been removed by the sludge deliquid separation device is wound around the first roll, and then , a portion of the band-shaped filter material wound around the first roll from which sludge has been removed by the sludge deliquid separation device is unwound and wound around the second roller via the sludge deliquid separation device. Move it forward again so that the As a result, the band-shaped filter medium is used multiple times for coolant filtration, so the replacement cycle of the band-shaped filter medium becomes longer, and the frequency of maintenance of the band-shaped filter medium can be reduced.

Preferably, the sludge deliquid separation device includes a pressing roller that continuously presses the sludge deposited on one surface of the band-shaped filter medium sent out from the filter feeding device. As a result, the sludge is removed by the pressure roller that continuously squeezes the sludge accumulated on the outer peripheral surface of the band-shaped filter medium sent from the filter feeding device, making it easier to separate the sludge from the band-shaped filter medium. be done. In addition, since the sludge and filter strips are deliquified by the pressure roller, the environmental burden caused by the disposal of the sludge and filter strips is reduced.

Preferably, the sludge deliquid separation device is provided at a position downstream of the squeezing roller in the moving direction of the band-shaped filter medium sent out from the filter feeding device, and the sludge is attached to the outer circumferential surface of the band-shaped filter medium. A rotating brush is provided to separate the cake-like sludge from the band-shaped filter medium after deliquification. As a result, the rotating brush separates the cake-like sludge that has adhered to the outer circumferential surface of the band-shaped filter medium after dewatering.

Further, preferably, the sludge deliquid separation device is provided at a position downstream of the rotating brush in the moving direction of the band-shaped filter medium, and removes the deliquified sludge adhering to the outer peripheral surface of the band-shaped filter medium into the band-shaped filter medium. A spray nozzle is provided that separates the filter medium by spraying fluid from the inner circumferential surface of the filter medium. Thereby, the fluid is injected from the inner circumferential surface of the band-shaped filter medium by the injection nozzle, and the sludge that has adhered to the outer circumferential surface of the band-shaped filter medium after liquid removal is separated from the band-shaped filter medium.

Preferably, the sludge deliquid separation device includes a guide roller that turns and guides the band-shaped filter medium sent out from the filter feeding device in an acute angle direction, and the pinch roller is upstream of the guide roller. The rotary brush and the spray nozzle are provided at a downstream position of the guide roller. As a result, before the band-shaped filter medium reaches the guide roller, the sludge adhering to the outer circumferential surface of the band-shaped filter medium is removed by the pressure roller and turned into a cake. Moreover, since cracks are formed in the sludge by the rotation of the band-shaped filter medium as it passes through the guide roller, the efficiency with which the sludge is removed from the band-shaped filter medium by the rotating brush and the injection nozzle is increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating the configuration of a drum-type filter device using a band-shaped filter medium according to an embodiment of the present invention using its cross section. It is a schematic diagram explaining the structure of the sludge deliquid separation apparatus of the drum-type filtration apparatus using the belt-shaped filter medium of other Example of this invention using its cross section.

Embodiments of the present invention will be described in detail below with reference to the drawings. Note that the figures in the following examples are schematic diagrams that have been appropriately simplified or modified, and the dimensional ratios, shapes, etc. of each part are not necessarily accurately drawn.

FIG. 1 is a side view of a drum-type filtration device (hereinafter referred to as a filtration device) 10 using a band-shaped filter medium according to an embodiment of the present invention, taken along a vertical plane passing through the center of the filtration device 10 in the width direction. It is a schematic diagram shown in cross section. In FIG. 1, the filtration device 10 includes 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, a front wall 12c, a rear wall 12d, and a pair of side walls 12a. , 12b, and a bottom wall 12f. A case 12 is provided on a clean tank 14 that stores coolant after purification, that is, a clean liquid CF.

A cutout 16 is formed at the end of the bottom wall 12f on the rear wall 12d side, and a sludge storage container 18 that opens upward and accommodates the sludge SG is disposed below the cutout 16. There is. A partition wall 12g is provided inside the case 12 to partition the inside of the case 12 into a front space S1 that accommodates the drum 36, the filter feeding device 40, etc., and a rear space S2 that accommodates the sludge deliquid separation device 22. There is.

The filtration device 10 is rotatably supported by a cylindrical drum support shaft 30 horizontally spanned between a pair of side walls 12a and 12b, and the drum support shaft 30 in order to rotatably support a drum 36. A pair of circular members 32 are connected to each other via a longitudinal connecting member 34 having a predetermined length so as to face each other at a constant interval. The filter feeding device 40 includes an endless annular mesh belt 38 extending along half the circumference. The rotation center line CL of the drum 36 is also the center line of the cylindrical drum support shaft 30.

In the front space S1 of the case 12, a cylindrical first roll 24 around which one end of a band-shaped filter medium 46 having a predetermined width, which functions as a band-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 band-shaped filter medium 46 is wound is rotatably supported by the side walls 12a, 12b. The filter feeding device 40 includes a first torque motor TM1 that provides the first roll 24 with a constant torque that generates tension in the band-shaped filter medium 46, and a first torque motor TM1 that applies a constant torque that generates tension in the band-shaped filter medium 46 to the second roll 26. and a second torque motor TM2. As a result, the elongated strip-shaped filter medium 46 is unwound from the first roll 24 under a constant tension, and is wound onto the second roll 26 from the filter feeding device 40 via the sludge deliquid separation device 22. It is removed and the slack is suppressed.

The filter feeding device 40 is provided so as to surround the drum 36, and rotationally drives the driving roller 42 and three driven rollers 44a, 44b, and 44c around which an endless annular mesh belt 38 is wound. is equipped with an electric motor M, and when the drive roller 42 is rotationally driven, the endless annular mesh belt 38 and the drum 36 are rotated. As a result, the band-shaped filter medium 46 unwound from the first roll 24 is sandwiched between the mesh belt 38 and the pair of circular members 32 in a semicircular shape, and is then transferred from the filter feeding device 40 via the sludge deliquid separation device 22. and is sent toward the second roll 26. The elongated filter material 46 is a filter material made of a filter material such as nonwoven fabric, woven fabric, or filter paper. Further, the mesh belt 38 is a metal mesh having a large number of meshes, a synthetic fiber, a carbon fiber, or a composite material mesh.

Of the three driven rollers 44a, 44b, and 44c, the driven roller 44c is positioned at a height equal to or higher than the drive roller 42, and the pair of driven rollers 44a, 44b are The height position is determined so that the mesh belt 38 stretched between the drums 44b is located a predetermined distance below the drum 36, and is also spaced a predetermined distance apart in the horizontal direction. The strip-shaped filter medium 46 sent from the filter feeding device 40 to the sludge deliquid separation device 22 is wound around the second roll 26 .

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

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 band-shaped filter medium 46 in the drum 36, and a motor control that controls the rotation of the drive roller 42. The rotational speed of the drive 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 (advance) of the strip filter medium 46 is adjusted. (speed) properly.

When the forward delivery amount of the strip filter medium 46 toward the sludge deliquid separation device 22 reaches a preset predetermined feed amount, the filter feed device 40 moves the strip filter medium 46 in the backward direction in the opposite direction. The band-shaped filter medium 46 can be used multiple times for filtering the coolant by reciprocating the filter medium 46 by reciprocating the filter medium by a predetermined amount and sending it forward again.

When the filter feeding device 40 reaches a preset position, for example, a position where the number of windings of the filter strip 46 that has been unwound from the first roll 24 becomes zero, the filter feeding device 40 moves the filter media 46 to the drum support. Until the inflow of the dirty liquid DF from the shaft 30 is stopped and the portion of the band-shaped filter medium 46 from which sludge has been removed by the sludge deliquid separation device 22 is wound up on the first roll 24, for example, the second roll The band-shaped filter medium 46 is retreated to the position where the remaining number of windings of the band-shaped filter medium 46 becomes zero. Next, in the filter feeding device 40, the sludge is removed from the band-shaped filter material 46 wound around the first roll 24 by the sludge deliquid separation device 22 while the inflow of the dirty liquid DF from the drum support shaft 30 is resumed. The removed portion is unwound and advanced again through the sludge deliquid separation device 22 to be wound around the second roller 26. Then, the filter feeding device 40 repeats such forward and backward movement of the band-shaped filter medium 46. As a result, the band-shaped filter medium 46 is used multiple times for filtering the coolant, so the replacement cycle of the band-shaped filter medium 46 becomes longer, and the frequency of maintenance of the band-shaped filter medium 46 is reduced.

The sludge deliquid separation device 22 includes a pair of pressing rollers 52 that continuously squeezes the sludge SG accumulated on the outer circumferential surface of the band-shaped filter medium 46 fed out from the filter feeding device 40 in a substantially horizontal direction in the rear space S2. and a pair of guide rollers 54 and 56 located diagonally below the pressure roller 52 and separated by a predetermined distance in the vertical direction, and on the outer peripheral surface of the band-shaped filter medium 46 located between the pair of guide rollers 54 and 56 A rotating brush 58 separates the cake-like sludge SG that has been accumulated and has been deliquified by the pinching roller 52 from the outer peripheral surface of the band-shaped filter medium 46, and a rotating brush 58 that separates the cake-like sludge SG that has been deliquified by the pinching roller 52 from the outer circumferential surface of the band-shaped filter medium 46; It includes an injection nozzle 60 that separates sludge SG adhering to the outer circumferential surface of the band-shaped filter medium 46 by ejecting fluid such as air or coolant from the circumferential surface. The clean liquid CF that has fallen from the squeezing roller 52 through the band-shaped filter medium 46 due to the pinching pressure of the sludge SG on the outer peripheral surface of the band-shaped filter medium 46 is caused to flow into the clean tank 14 via the clean liquid guide swash plate 64 .

In order to pinch the band-shaped filter medium 46 between the pair of pinch rollers 52, preferably at least one of the pair of pinch rollers 52 is elastically deformable in the radial direction. It is configured to include an elastic member made of a material such as synthetic rubber. Alternatively, a roller biasing mechanism is provided in which one bearing of the pair of pinch rollers 52 is biased toward the other bearing.

As described above, according to the filtration device 10 of this embodiment, the sludge deliquid separation device 22 can use the strip-shaped filter medium 46 for repeated filtration by moving the longitudinal strip-shaped filter medium 46 forward and backward. Thereby, it is possible to use the belt-shaped filter medium 46 having a long overall length, and the filtration efficiency can be maintained, so that the frequency of maintenance of the belt-shaped filter medium 46 can be reduced.

Further, according to the filtration device 10 of the present embodiment, the liquid level sensor 48 that detects the liquid level of the dirty liquid DF staying on the band-shaped filter medium 46 in the drum 36, the feeding motor M that sends the band-shaped filter medium 46, and the liquid It includes a motor control device 50 that drives a feeding electric motor M to feed the strip filter medium 46 so that the liquid level of the dirty liquid DF detected by the surface sensor becomes a preset liquid level height. As a result, the band-shaped filter medium 46 is fed in just the right amount so as to maintain the liquid level height of the dirty liquid DF that remains, so the filtration efficiency of the band-shaped filter medium 46 is maintained high, and the band-shaped filter medium 46 is fed in just the right amount. It will be done.

Further, according to the filtration device 10 of the present embodiment, the filter feeding device 40 applies a constant torque to the first roll 24 around which one end portion of the band-shaped filter medium 46 is wound to generate a tension in the band-shaped filter medium 46. It includes a torque motor TM1 and a second torque motor TM2 that applies a constant torque to the second roll 26 around which the other end of the band-shaped filter medium 46 is wound to generate tension in the band-shaped filter medium 46. As a result, the elongated filter medium 46 is fed from the filter feed device 40 to the sludge deliquid separation device 22 with a constant tension applied thereto. As a result, loosening of the band-shaped filter medium 46 is suppressed.

Further, according to the filtration device 10 of the present embodiment, the filter feed device 40 is configured such that the portion of the strip filter medium 46 from which the sludge SG has been removed by the sludge deliquid separation device 22 is wound around the first roll 24. The band-shaped filter medium 46 is moved backward, and then the portion of the band-shaped filter medium 46 wound around the first roll 24 from which the sludge SG has been removed by the sludge deliquid separation device 22 is unwound and passed through the sludge deliquid separation device 22. Then, it is moved forward again so that it is wound around the second roller 26. As a result, the band-shaped filter medium 46 is used multiple times for filtering the coolant, so the replacement cycle of the band-shaped filter medium 46 becomes longer, and the frequency of maintenance of the band-shaped filter medium 46 can be reduced.

Furthermore, the sludge deliquid separation device 22 of this embodiment includes a pressing roller 52 that continuously presses the sludge SG deposited on one surface of the band-shaped filter medium 46 sent out from the filter feeding device 40. As a result, the sludge SG is deliquified by the pressure roller 52 that continuously pinches the sludge SG accumulated on the outer peripheral surface of the band-shaped filter medium 46 sent from the filter feeding device 40, so that the sludge SG is removed from the band-shaped filter medium 46. Since peeling is facilitated and the sludge SG and the strip filter medium 46 have been deliquified, the environmental load due to the disposal of the sludge SG and the strip filter medium 46 can be reduced.

Further, the sludge deliquid separation device 22 of this embodiment is provided at a position downstream of the pinching roller 52 in the moving direction of the strip-shaped filter material 46 sent out from the filter feeding device 40, and is attached to the outer peripheral surface of the strip-shaped filter material 46. An electric rotating brush 58 is provided to separate the cake-like sludge SG after deliquification from the band-shaped filter medium 46. Thereby, the cake-like sludge SG after dewatering adhering to the outer circumferential surface of the band-shaped filter medium 46 is suitably separated by scratching with the bristles of the rotating brush 58 .

Furthermore, the sludge deliquid separation device 22 of this embodiment is provided at a position downstream of the rotating brush 58 in the moving direction of the band-shaped filter medium 46, and removes the deliquified sludge SG attached to the outer peripheral surface of the band-shaped filter medium 46 into a band-like shape. A spray nozzle 60 is provided that separates the filter medium 46 by spraying fluid from the inner circumferential surface thereof. As a result, the fluid is injected from the inner circumferential surface of the band-shaped filter medium 46 by the injection nozzle 60, and the deliquified sludge SG adhering to the outer circumferential surface of the band-shaped filter medium 46 is separated from the band-shaped filter medium 46.

According to the filtration device 10 of the present embodiment, a gutter member is provided below the drum 36 to receive the clean liquid CF from which the dirty liquid DF remaining on the band-shaped filter medium 46 in the drum 36 has passed downward through the band-shaped filter medium 46. It becomes unnecessary to provide Thereby, the filter device 10 becomes compact.

Further, according to the filtration device 10 of the present embodiment, below the sludge deliquid separation device 22, there is an upper part for receiving the sludge SG that is separated from the band-shaped filter medium 46 and falls by the rotating brush 58 and the injection nozzle 60. A sludge storage container 18 that opens toward the sludge storage container 18 is arranged. As a result, the sludge SG separated from the band-shaped filter medium 46 is collected in the sludge storage container 18.

Below, another sludge deliquid separation device 28 different from the sludge deliquid separation device 22 will be explained using the schematic diagram of FIG. 2. In the following description, the same reference numerals are given to the same parts as in the above-mentioned embodiment, and the description thereof will be omitted.

The main parts of the sludge deliquid separation device 28 of this embodiment are shown in FIG. In the process in which the strip-shaped filter medium 46 sent out from the drive roller 42 of the filter feeding device 40 passes through the sludge deliquid separation device 28 and is wound up by the second roller 26, the strip-shaped filter medium 46 is turned at an acute turning angle α and guided. The sludge deliquid separation device 28 is equipped with a guide roller 80 having a relatively small diameter, for example, 30 mm or less, preferably 20 mm or less. In the moving direction of the band-shaped filter medium 46, the pinching roller 52 is provided at a position upstream of the guide roller 80, and the rotating brush 58 and the spray nozzle 60 are provided at a position downstream of the guide roller 80. The smaller the turning angle α is, the larger the cracks will be in the sludge SG, so it is preferably 60° or less, more preferably 30° or less.

In the sludge deliquid separation device 28 of this embodiment, before the band-shaped filter medium 46 reaches the guide roller 80, the sludge SG adhering to the outer peripheral surface of the band-shaped filter medium 46 is deliquified by the pressure roller 52, and becomes cake-like. be done. In addition, since cracks are formed in the sludge due to the sharp turn of the strip filter medium 46 as it passes through the guide roller 80, the efficiency of peeling the sludge SG from the strip filter medium 46 by the rotating brush 58 and the injection nozzle 60 is increased.

Although one embodiment of the present invention has been described above based on the drawings, the present invention can also be applied to other aspects.

For example, the filter feeding device 40 described above reciprocates the band-shaped filter medium 46 so that the band-shaped filter medium 46 can be used multiple times for filtering coolant, but the reciprocating drive stroke of the band-shaped filter medium 46 is It does not necessarily have to be the entire length of the band-shaped filter medium 46, but may be a part of the band-shaped filter medium 46 in the longitudinal direction.

In addition, in the above-mentioned embodiment, a pair of pressure rollers 52 were arranged to pinch the band-shaped filter medium 46 in order to deliquify the sludge on the band-shaped filter medium 46, but a plurality of pairs of pressure rollers 52 were arranged. may have been done.

Further, in the above-mentioned embodiment, the drum 36 had a pair of circular members 32 connected by a rod-shaped connecting member 34, but the circular member 32 is not disc-shaped but has a hub and a ring-shaped member. It may also be a circular member connected by a plurality of radial members fitted in between.

Note that the above-mentioned embodiment is merely one embodiment, and the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

10: Filtration device (drum type filtration device using band-shaped filter material)
12: Case 14: Clean tank 18: Sludge storage container 22: Sludge deliquid separation device 24: First roll 26: Second roll 30: Drum support shaft 32: Circular member 34: Connecting member 36: Drum 38: Mesh belt 40 : Filter feed device 42: Drive rollers 44a, 44b, 44c: Followed roller 46: Band-shaped filter medium 48: Liquid level sensor 50: Motor control device 52: Squeezing rollers 54, 56: Guide roller 58: Rotating brush 60: Spray nozzle 64 : Clean liquid guide swash plate SG: Sludge TM1: First torque motor TM2: Second torque motor CF: Clean liquid DF: Dirty liquid

Claims (8)

A drum in which a pair of circular members rotatably supported by a horizontal drum support shaft are interconnected via a connecting member of a predetermined length, and an endless drum that extends half a circumference around the lower outer periphery of the pair of circular members. A filter feeding device including an annular mesh belt, a longitudinal band-shaped filter medium sandwiched between the mesh belt and the pair of circular members and fed by the filter feeding device, and fed out from the filter feeding device. A drum-type filtration device using a band-shaped filter medium, comprising: a sludge deliquid separation device that continuously separates sludge adhering to the outer peripheral surface of the band-shaped filter medium from the band-shaped filter medium,
A drum type filtration device using a band-shaped filter medium, wherein the filter feeding device moves the band-shaped filter medium backward in the opposite direction and sends it out again when the feeding amount of the band-shaped filter medium reaches a predetermined feed rate set in advance. . The filter feeding device includes a liquid level sensor that detects the level of the dirty liquid remaining on the band-shaped filter medium in the drum, a feed motor that feeds the band-shaped filter medium, and a liquid level detected by the liquid level sensor. The drum-type filtration device using a band-shaped filter medium according to claim 1, further comprising: a motor control device that drives the feed motor to feed the band-shaped filter medium so that the liquid level reaches a preset liquid level. The filter feeding device includes a first torque motor that applies a constant torque that generates tension to the band-shaped filter medium to a first roll around which one end of the band-shaped filter medium is wound, and a first torque motor that applies a constant torque to generate tension in the band-shaped filter medium, and a first torque motor that applies a constant torque that generates tension to the band-shaped filter medium, and a first roll around which the other end of the band-shaped filter medium is wound. The drum-type filtration device using a band-shaped filter medium according to claim 1, further comprising a second torque motor that applies a constant torque to generate tension in the band-shaped filter medium to the second roll. The filter feeding 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 deliquid separation device is wound around the first roll, and then moves the band-shaped filter medium back to the first roll. A portion of the wound band-shaped filter medium from which sludge has been removed by the sludge deliquid separation device is unwound and advanced again so as to be wound around the second roller via the sludge deliquid separation device. A drum-type filtration device using the band-shaped filter medium according to claim 3. The sludge deliquid separation device includes a pressure roller that continuously presses the sludge deposited on one surface of the band-shaped filter medium sent out from the filter feeding device. Drum type filtration device. The sludge deliquid separation device is provided at a position downstream of the squeezing roller in the moving direction of the band-shaped filter medium sent out from the filter feeding device, and removes the deliquified cake attached to the outer peripheral surface of the band-shaped filter medium. The drum-type filtration device using a band-shaped filter medium according to claim 5, further comprising a rotating brush that separates the sludge from the band-shaped filter medium. The sludge deliquid separation device is provided at a position downstream of the rotating brush in the moving direction of the band-shaped filter medium, and removes the deliquified sludge adhering to the outer circumferential surface of the band-shaped filter medium from the inner circumferential surface of the band-shaped filter medium. The drum-type filtration device using a band-shaped filter medium according to claim 6, further comprising an injection nozzle that separates the fluid by injection of the fluid. The sludge deliquid separation device includes a guide roller that turns and guides the band-shaped filter medium sent out from the filter feeding device in an acute angle direction,
The pinching roller is provided at an upstream position of the guide roller,
The drum-type filtration device using a band-shaped filter medium according to claim 7, wherein the rotating brush and the injection nozzle are provided at a downstream position of the guide roller.

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