Drum-type filtration system using strip-shaped filter media

Abstract

To provide a drum-type filter device using an endless annular belt-like filter medium which can easily scrape sludge from the belt-like filter medium and maintain filtration efficiency.SOLUTION: Since a sludge liquid removal separation device 22 includes a pinching roller 72 which continuously pinches sludge accumulated on the outer peripheral surface of a belt-like filter medium 46 fed from a filter feeding device 40, the sludge which is made into the cake shape with the liquid removal action of the pinching roller 72 is easily removed from the outer peripheral surface of the belt-like filter medium 46. In addition, since the sludge is easily removed, the decrease in the filtration efficiency of a drum-type filter device 10 is suppressed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a drum-type filtration device using a strip-shaped filter medium that is continuously fed along the lower half circumference of a drum, and by passing a coolant through the strip-shaped filter medium, foreign matter contained in the coolant is removed.

Background Art

[0002] In machining such as grinding machines and cutting machines used in the manufacture of automotive parts, bearings, etc., a dirty coolant (dirty liquid) used in machining and grinding is passed through a strip-shaped filter medium that is continuously fed along the lower half circumference of a drum, and by removing foreign matter from the dirty liquid, a cleaned clean liquid is obtained and made reusable. A drum-type filtration device using a strip-shaped filter medium has been proposed. For example, the drum-type filtration device using the strip-shaped filter medium described in FIGS. 1 to 9 of Patent Document 1 is such a device.

[0003] The drum-type filtration device using the strip-shaped filter medium includes a pair of circular members fixed to a rotatable horizontal support shaft at a predetermined interval, a filter medium feeding device provided with an endless annular mesh belt extending along the lower half circumference of the pair of circular members, and a strip-shaped filter medium continuously fed while being sandwiched between the mesh belt and each circular member. While the strip-shaped filter medium is fed in the circumferential direction together with the pair of circular members and the mesh belt, the dirty coolant is passed from the inner peripheral side to the outer peripheral side of the strip-shaped filter medium, so that a cleaned coolant (clean liquid) can be obtained.

[0004] By the way, in the drum-type filtration device using the strip-shaped filter medium described in FIGS. 1 to 9 of Patent Document 1, the strip-shaped filter medium for filtering the dirty liquid is pulled out from a roll around which an unused strip-shaped filter medium is wound, continuously fed while being sandwiched between the mesh belt and each circular member, and then the used strip-shaped filter medium is collected in a collection box. Since this strip-shaped filter medium is disposable, there are problems such as an increase in the operating cost of the drum-type filtration device and a large environmental load due to the disposal of the used strip-shaped filter medium. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-314703 [Overview of the project] [Problems that the invention aims to solve]

[0006] In contrast, Figure 10 of Patent Document 1 describes a drum-type filtration device that uses an endless annular strip filter media, which can reduce the operating costs of the drum-type filtration device and minimize the environmental burden caused by the disposal of used strip filter media. This drum-type filtration device is equipped with a scraper or brush roll for continuously scraping off the filtered sludge from the strip filter media.

[0007] However, the sludge on the strip-shaped filter media contains a large amount of liquid components and is relatively soft. Therefore, when scraping the sludge off the strip-shaped filter media using a scraper or brush roll, a large amount of the sludge remains on the strip-shaped filter media. If the strip-shaped filter media moves in this state and filters the coolant again, the filtration efficiency of the drum-type filter system decreases.

[0008] The present invention was made against the above circumstances, and its objective is to provide a drum-type filtration device using an endless annular strip-shaped filter material that can easily scrape off sludge from the strip-shaped filter material and maintain filtration efficiency. [Means for solving the problem]

[0009] Based on the above circumstances, the inventors conducted various studies on drum-type filtration devices and found that by compressing sludge adhering to one side of a strip-shaped filter medium to remove it and form a cake-like substance, the cake-like sludge can be easily separated from the strip-shaped filter medium. Furthermore, they discovered that by employing such a sludge separation method, filtration efficiency can be maintained. The present invention is based on these findings.

[0010] In other words, the gist of the first invention is (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 equipped with an endless annular mesh belt that runs along half the circumference of the lower outer circumference of the pair of circular members; an endless annular strip of filter material that is fed by the filter feeding device while sandwiched between the mesh belt and the pair of circular members; and a sludge dewatering and separation device that separates sludge adhering to the outer surface of the strip of filter material fed out from the filter feeding device. , a clean tank located below the drum for storing the coolant filtered through the strip-shaped filter media, a forward-side strip-shaped filter media from the endless annular strip-shaped filter media that is sandwiched between the mesh belt and the pair of circular members and sent, and a return-side strip-shaped filter media that has passed through the sludge deliquidation and separation device, and a receiving trough member located below the drum, between the forward-side strip-shaped filter media and the return-side strip-shaped filter media, for receiving the clean liquid that has passed downward through the forward-side strip-shaped filter media from the dirty liquid that remains on the forward-side strip-shaped filter media inside the drum, to guide it to the clean tank, A drum-type filtration device comprising a strip-shaped filter material, wherein (b) the sludge dewatering and separation device continuously compresses the sludge accumulated on the outer surface of the strip-shaped filter material sent out from the filter feeding device. a pair The clamping roller and the direction of movement of the strip-shaped filter material a pair Located downstream of the clamping roller, a pair The apparatus comprises a guide roller that curves the strip-shaped filter material fed from the clamping roller and guides it in an acute-angle direction, and forms cracks in the cake-like sludge adhering to the outer surface of the strip-shaped filter material after dewatering, wherein the guide roller has a smaller diameter than the clamping roller, The pair of clamping rollers The aforementioned strip-shaped filter material to plan It is about what is contained within. [Effects of the Invention]

[0011] According to the drum-type filtration apparatus using the strip-shaped filter material of the present invention, the sludge removal and separation apparatus continuously compresses the sludge accumulated on the outer surface of the strip-shaped filter material that has been sent out from the filter feeding device. a pairIt is equipped with a clamping roller, and the guide roller has a smaller diameter than the clamping roller, The pair of clamping rollers The aforementioned strip-shaped filter material to plan Because of this design, the cake-like sludge formed by the dehydration action of the clamping roller is easily removed from the outer surface of the strip-shaped filter media. Furthermore, this easy removal of sludge suppresses a decrease in the filtration efficiency of the drum-type filtration device. In addition, cracks are formed in the sludge during the bending process as the strip-shaped filter media passes through guide rollers with a smaller diameter than the clamping rollers, thus improving the efficiency of sludge removal from the strip-shaped filter media by the downstream rotating brush and spray nozzles.

[0012] Here, preferably, the sludge dewatering and separation device is configured such that the strip-shaped filter material sent from the filter feeding device moves in the direction of movement of the filter. guidance The system includes a rotating brush located downstream of the roller, which separates the cake-like sludge that has adhered to the outer surface of the strip-shaped filter material after dewatering from the strip-shaped filter material. As a result, the rotating brush separates the cake-like sludge that has adhered to the outer surface of the strip-shaped filter material after dewatering.

[0013] Preferably, the sludge dewatering and separation device includes an injection nozzle positioned downstream of the rotating brush in the direction of movement of the strip-shaped filter material, which separates the sludge after dewatering that adheres to the outer surface of the strip-shaped filter material by injecting fluid from the inner surface of the strip-shaped filter material. As a result, the sludge after dewatering that adheres to the outer surface of the strip-shaped filter material is separated from the strip-shaped filter material by the injection of fluid from the inner surface of the strip-shaped filter material by the injection of fluid from the injection nozzle.

[0015] Preferably, the guide roller has a diameter of 30 mmφ or less, and Record band The filter media is guided in an acute angle direction of 60° or less.

[0016] Preferably, a sludge storage container that opens upward and receives the sludge separated from the belt-shaped filter medium by the rotary brush and the injection nozzle is disposed below the sludge dewatering and separating device. Thereby, the sludge separated from the belt-shaped filter medium is collected in the sludge storage container.

[0017] Preferably, the filter feeding device includes a liquid level sensor that detects the liquid level of the dirty liquid staying on the belt-shaped filter medium in the drum, a feeding motor that feeds the belt-shaped filter medium, and a motor control device that drives the feeding motor to feed the belt-shaped filter medium so that the liquid level detected by the liquid level sensor becomes a preset liquid level height. Thereby, since the belt-shaped filter medium is fed without excess or deficiency, the consumption of the belt-shaped filter medium is suppressed.

Brief Description of the Drawings

[0018] [Figure 1] It is a schematic diagram for explaining the configuration of a drum-type filtration device using a belt-shaped filter medium according to an embodiment of the present invention with its cross-section. [Figure 2] It is a view for explaining a support shaft and a receiving gutter member that rotatably support the drum of the drum-type filtration device in FIG. 1, and is a cross-sectional view taken along line II-II in FIG. 1. [Figure 3] It is a cross-sectional view for explaining the configuration of the inflow buffer box in FIG. 2. [Figure 4] It is a plan view for explaining the receiving gutter member of the drum-type filtration device in FIG. 1. [Figure 5] It is a plan view showing a flush nozzle provided on the receiving gutter member in FIG. 4. [Figure 6] It is a plan view showing another example of the flush nozzle provided on the receiving gutter member in FIG. 4. [Figure 7] It is a plan view showing another example of the flush nozzle provided on the receiving gutter member in FIG. 4. [Figure 8] It is a plan view showing another example of the flush nozzle provided on the receiving gutter member in FIG. 4. [Figure 9]This is a schematic diagram illustrating the configuration of a sludge removal and separation device in a drum-type filtration apparatus using a strip-shaped filter material according to another embodiment of the present invention, using its cross-section. [Modes for carrying out the invention]

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the figures in the following embodiments are schematic diagrams that have been simplified as appropriate, and the shapes and dimensional ratios of each part are not necessarily depicted accurately. [Examples]

[0020] Figure 1 is a side view of a drum-type filtration device (hereinafter referred to as "filtration device") 10 using a strip-shaped filter material according to one embodiment of the present invention, and is a schematic diagram showing a cross-section cut by a vertical plane passing through the center in the width direction of the filtration device 10. In Figure 1, the filtration device 10 is provided on a clean tank 14 that stores purified coolant, i.e., clean liquid CF. The case 12 has a front wall 12c, a rear wall 12d, a pair of left and right side walls 12a and 12b connecting the front wall 12c and the rear wall 12d, an upper wall 12e that closes the opening of the space surrounded by the front wall 12c, the rear wall 12d, and the pair of side walls 12a and 12b from above, and a bottom wall 12f.

[0021] A notch 16 is formed at the end of the bottom wall 12f on the rear wall 12d side, and below the notch 16, a sludge containment container 18 is provided that opens upward to contain the sludge SG. Inside the case 12, a partition wall 12g is provided to divide the inside of the case 12 into a front space S1 that houses the drum 36 and filter feeding device 40, etc., and a rear space S2 that houses the sludge dewatering and separation device 22.

[0022] The filtration device 10 includes a cylindrical drum support shaft 30 horizontally stretched between a pair of side walls 12a and 12b to rotatably support the drum 36, a cylindrical drum 36 in which a pair of circular members 32a and 32b, rotatably supported by the drum support shaft 30, are connected to each other via a longitudinal connecting member 34 of a predetermined length, facing each other at a fixed distance apart, and a filter feeding device 40 equipped with an endless annular mesh belt 38 that runs along half the circumference of the lower outer circumference of the pair of circular members 32a and 32b. The rotational centerline CL of the drum 36 is also the centerline of the cylindrical drum support shaft 30.

[0023] The filter feeding device 40 is provided so as to surround the drum 36 and includes a drive roller 42 around which an endless annular mesh belt 38 is wound, and three driven rollers 44a, 44b, and 44c. When the drive roller 42 is rotated by the electric motor M, the endless annular mesh belt 38 and the drum 36 are rotated. As a result, the endless annular strip-shaped filter material 46, with a portion of it sandwiched between the mesh belt 38 and a pair of circular members 32a and 32b, is fed by the filter feeding device 40. The endless annular strip-shaped filter material 46 is a strip-shaped filter made of a filter material such as nonwoven fabric, woven fabric, or filter paper. The mesh belt 38 is a mesh made of metal mesh, synthetic fiber, carbon fiber, or composite material with a large number of mesh openings.

[0024] Of the three driven rollers 44a, 44b, and 44c described above, the driven roller 44c is positioned at a height equal to or greater than that of the drive roller 42, and the pair of driven rollers 44a and 44b are positioned horizontally at a predetermined distance below the drum 36 at a height predetermined distance from the drum 36. The strip-shaped filter material 46 sent from the filter feeding device 40 to the sludge deliquidation and separation device 22 returns to the lower side of the pair of driven rollers 44a and 44b, passes through the driven roller 44c, and is again sandwiched between the mesh belt 38 and the pair of circular members 32a and 32b.

[0025] The cylindrical drum support shaft 30 allows the dirty liquid DF discharged from the polishing or grinding machine using coolant to flow onto the strip-shaped filter media 46 inside the drum 36. As a result, the dirty liquid DF that remains on the strip-shaped filter media 46 inside the drum 36 is passed downward through the strip-shaped filter media 46, causing sludge SG to accumulate on the outer surface of the strip-shaped filter media 46.

[0026] Figure 2 is a diagram illustrating the drum support shaft 30 that rotatably supports the drum 36, and is a vertical cross-sectional view taken along line II-II in Figure 1. Figure 2 shows the state in which the mesh belt 38 and the strip-shaped filter material 46 are not wound around the drum 36. As shown in Figure 2, the tip (right end) 30a and base (left end) 30b of the cylindrical drum support shaft 30 are supported in a penetrating manner by a pair of right and left support flanges 48a, 48b fastened to a pair of side walls 12a, 12b, respectively, so as to be concentric with the horizontal axis of rotation C1. The drum support shaft 30 is detachably attached to the case 12 by a set screw 50 provided on the support flange 48a on the side of the drum support shaft 30 that is attached to the tip 30a of the drum support shaft 30, so as to screw radially along the drum support shaft 30. A dirty pipe 52 is connected to the base end 30b of the drum support shaft 30 to guide coolant, i.e., dirty liquid DF, discharged from a grinding machine (not shown), and the dirty liquid DF is allowed to flow into the case 12 from a longitudinal outlet 30d formed in the middle part 30c of the drum support shaft 30 in the longitudinal direction (direction of the rotation axis C1).

[0027] The drum 36 is positioned on the drum support shaft 30 so as to be separated from the pair of side walls 12a, 12b by interposing a pair of cylindrical collars 52a, 52b between the pair of circular members 32a, 32b and the pair of side walls 12a, 12b.

[0028] An inlet buffer box 54 is attached to the middle section 30c of the drum support shaft 30 so as to cover the longitudinal outlet 30d. The inlet buffer box 54 is detachably fixed by fastening the ears 56a and 56b that protrude from the inlet buffer box 54 in the direction of the rotation axis C1 to the drum support shaft 30 with bolts 60. Wire W is an electric wire that connects the liquid level sensor 68 and the motor control device 70 shown in Figure 1.

[0029] Figure 3 is a cross-sectional view taken along line III-III in Figure 2, illustrating the interior of the inlet buffer box 54. As shown in Figure 3, the inlet buffer box 54 is a rectangular parallelepiped having a longitudinal top plate 54e, a bottom plate 54f, a front plate 54c, and a rear plate 54d that are longer horizontally than the outlet 30d of the drum support shaft 30, and a pair of end plates 54a and 54b that close the longitudinal space enclosed by them from the left and right. The inlet buffer box 54 also includes a slanted plate 62 that changes the direction of flow of the dirty liquid DF, and a weir plate 64 of a predetermined height that suppresses the flow velocity of the dirty liquid DF.

[0030] The slanted plate 62 of the inflow buffer box 54 protrudes diagonally downward from the lower edge of the front plate 54c toward the rear plate 54d, receiving the dirty liquid DF flowing down from the discharge port 30d of the drum support shaft 30 and changing its direction toward the rear plate 54d. The weir plate 64 of the inflow buffer box 54 is provided on the bottom plate 54f in a direction that intersects the flow of the dirty liquid DF that falls from the slanted plate 62 and turns around from the rear plate 54d to flow on the bottom plate 54f, for example, in a direction parallel to the rotation axis C1, and suppresses the flow velocity of the dirty liquid DF flowing along the bottom plate 54f. The slanted plate 62 and the weir plate 64 have a longitudinal shape equivalent to the longitudinal dimension of the inflow buffer box 54. Therefore, the slanted plate 62 and the weir plate 64 have a width dimension L2 that is larger than the longitudinal dimension L1 of the discharge port 30d.

[0031] The inlet buffer box 54 has an outlet 66 formed between the lower edge of the front plate 54c and the weir plate 64, which opens longitudinally and allows the dirty liquid DF that has passed the weir plate 64 to flow out. In the inlet buffer box 54, the dirty liquid DF discharged from the outlet 30d formed on the drum support shaft 30 is received by the slanted plate 62 and its direction is changed, and then it collides with the rear plate 54d and its direction is reversed, thereby reducing its flow velocity. After being held in place by the weir plate 64 to eliminate turbulence, it flows out from the outlet 66 after passing the weir plate 64. As a result, the dirty liquid DF flowing out from the outlet 66 of the inlet buffer box 54 flows gently into the liquid surface L of the dirty liquid DF that is accumulating on the forward-side strip-shaped member 46f wrapped around the lower half circumference of the drum 36.

[0032] Returning to Figure 1, the filter feeding device 40 is provided on the drum support shaft 30 and includes a liquid level sensor 68 that detects the liquid level of the dirty liquid DF that remains on the strip-shaped filter media 46 inside the drum 36, and a motor control device 70 that controls the rotation of the drive roller 42. The device adjusts the amount of rotation of the drive roller 42 by the electric motor M so that the liquid level detected by the liquid level sensor 68 is at a preset liquid level, thereby appropriately controlling the feeding speed of the strip-shaped filter media 46.

[0033] The sludge dewatering and separation device 22 includes, in the rear space S2, a pair of clamping rollers 72 that continuously clamp the sludge SG accumulated on the outer surface of the strip-shaped filter material 46 that has been sent out substantially horizontally from the filter feeding device 40; a pair of guide rollers 74 and 76 located diagonally below the clamping rollers 72 and spaced at a predetermined vertical interval; a rotating brush 78 that separates the cake-like sludge SG, which has accumulated on the outer surface of the strip-shaped filter material 46 and has been dewatered by the clamping rollers 72, from the outer surface of the strip-shaped filter material 46, located between the pair of guide rollers 74 and 76; and an injection nozzle 80 located downstream of the rotating brush 78 that separates the sludge SG adhering to the outer surface of the strip-shaped filter material 46 by injecting air or a fluid such as coolant from the inner surface of the strip-shaped filter material 46. The clean liquid CF that falls through the strip filter material 46 from the clamping roller 72 due to the pressure of the sludge SG on the outer surface of the strip filter material 46 is allowed to flow into the clean tank 14 through the clean liquid guide passage 84 via a side opening 82 formed by penetrating one of the side walls 12a and 12b.

[0034] To clamp the strip-shaped filter material 46 between a pair of clamping rollers 72, the pair of clamping rollers 72 is preferably configured such that at least one of the rollers is made of an elastic material, such as synthetic rubber, that can be elastically deformed in the radial direction. Alternatively, a roller biasing mechanism is provided in which one bearing of the pair of clamping rollers 72 is biased toward the other bearing.

[0035] As shown in Figures 1 and 2, below the drum 36, in the space on the inner circumference side of the endless annular mesh belt 38, between the forward-path strip filter material 46f, which is sandwiched between the mesh belt 38 and a pair of circular members 32a and 32b and sent to the rotating brush 78, and the return-path strip filter material 46b, which has passed through the rotating brush 78 of the sludge dewatering and separation device 22 and returned to the drum 36, a receiving trough member 86 is horizontally positioned in the space between the endless annular mesh belt 38 and the forward-path strip filter material 46f, which is sandwiched between the mesh belt 38 and a pair of circular members 32a and 32b and sent to the rotating brush 78, and the return-path strip filter material 46b, which has passed through the rotating brush 78 of the sludge dewatering and separation device 22, and is receiving the clean liquid CF that falls downward through the forward-path strip filter material 46f from the dirty liquid DF that remains on the strip filter material 46 inside the drum 36. The receiving trough member 86 is fitted into a pair of mounting holes 88 formed through the side walls 12a and 12b of the filtration device 10, respectively.

[0036] The receiving gutter member 86 has a longitudinal dimension greater than the distance between the side walls 12a and 12b, and in the installed state, the tip and base of the receiving gutter member 86 protrude outward from the pair of mounting holes 88 formed in the side walls 12a and 12b, respectively. The receiving gutter member 86 is removable from the pair of mounting holes 88.

[0037] As shown in Figure 1, the receiving trough member 86 has a width dimension in the front-to-back direction that is sufficiently smaller than the diameter of the drum 36, and a rectangular horizontal bottom plate 86a that is sufficiently larger than the width in the direction of the rotation axis C1 of the drum 36, as shown in Figures 2 and 4; a pair of longitudinal edge plates 86b of a predetermined height erected from the side edges of the bottom plate 86a; a base side edge plate 86c of the same height as the longitudinal edge plate 86b erected from the base edge of the bottom plate 86a; and a plurality of flash nozzles 90 (five in this embodiment) fixed to the base side edge plate 86c at equal intervals in the width direction of the receiving trough member 86 and toward the open end 92 which is the front edge of the receiving trough member 86. The flash nozzles 90 spray clean liquid CF toward the open end 92 which is the front edge of the receiving trough member 86, moving the sludge on the receiving trough member 86.

[0038] The receiving trough member 86 has a relatively shallow, box-shaped tray form. The receiving trough member 86 does not have an edge plate erected along its leading edge, or if there is an edge plate along its leading edge, its height is set discontinuously lower than the longitudinal edge plate 86b, and it has an open end 92 through which the clean liquid CF received by the receiving trough member 86 passes. The clean liquid CF received by the receiving trough member 86 passes through the opening end 92 on the leading edge and falls into the clean tank 14 through the clean liquid passage 94. Therefore, even in the narrow space inside the mesh belt 38, a space is formed between the receiving trough member 86 and the forward-side strip-shaped filter material 46f wrapped around the lower half of the drum 36, so that the liquid surface of the clean liquid CF in the receiving trough member 86 does not come into contact with the forward-side strip-shaped filter material 46f wrapped around the lower half of the drum 36.

[0039] Because the receiving trough member 86 can only be positioned horizontally or at most on a gentle slope in the narrow space directly below the drum 36 within the endless annular mesh belt 38 and strip-shaped filter media 46, sludge SG tends to accumulate there. Therefore, the clean liquid CF in the clean tank 14, which is pumped by the electric pump 96, is sprayed from the flash nozzle 90 towards the leading edge of the receiving trough member 86. As a result, even if the height of the receiving trough member 86 is small, the clean liquid CF flows into the clean tank 14, reducing the space between the drum 36 and the clean tank 14, and allowing the filtration device 10 to be configured compactly.

[0040] The width dimension of the receiving trough member 86 perpendicular to the longitudinal direction is smaller than the diameter of the drum 36. A pair of inclined liquid collection plates 98 are fixed to a pair of side walls 12a and 12b in a side-by-side configuration on both sides of the receiving trough member 86 in the front-to-back direction of the drum-type filtration device 10. These plates are designed to collect clean liquid CF that has fallen downward from the drum 36 through the forward-side strip-shaped filter media 46f and cannot be collected by the receiving trough member 86, and to flow it into the receiving trough member 86. The pair of liquid collection plates 98 are inclined so that they move closer to each other as they move downward.

[0041] Figure 5 is a plan view showing an enlarged view of the flash nozzle 90. This flash nozzle 90 sprays the clean liquid CF in a straight line toward the tip edge of the receiving trough member 86, so that five parallel spray lines with circular cross-sections are formed from multiple flash nozzles 90. Instead of this flash nozzle 90, the flash nozzle 100 shown in Figure 6, the flash nozzle 102 shown in Figure 7, and the flash nozzle 104 shown in Figure 8 may be used. The flash nozzle 100 sprays the clean liquid CF radially. In this case, the number of flash nozzles 100 can be reduced. The flash nozzle 102 sprays the clean liquid CF with a flattened cross-section. In this case, an effective spray for moving the sludge SG can be obtained, so the amount of clean liquid CF sprayed can be reduced. The flash nozzle 104 sprays the clean liquid CF with wide spray lines arranged in a comb-like, flattened pattern. In this case, the number of flash nozzles 104 can be reduced, and the amount of clean liquid CF sprayed can be reduced.

[0042] As described above, in the filtration device 10 of this embodiment, the sludge dewatering and separation device 22 is equipped with a clamping roller 72 that continuously clamps the sludge SG accumulated on the outer surface of the forward-side strip-shaped filter media 46f sent from the filter feeding device 40. As a result, the sludge SG, which has been formed into a cake-like state by the dewatering action of the clamping roller 72, is easily removed from the outer surface of the forward-side strip-shaped filter media 46f. Furthermore, because the sludge SG is easily removed in this way, the decrease in the filtration efficiency of the drum-type filtration device 10 is suppressed.

[0043] Furthermore, the sludge dewatering and separation device 22 of this embodiment is equipped with an electrically operated rotating brush 78 located downstream of the clamping roller 72 in the direction of movement of the forward-side strip-shaped filter media 46f sent from the filter feeding device 40, which separates the cake-like sludge SG that has been dewatered and adhered to the outer surface of the strip-shaped filter media 46 from the forward-side strip-shaped filter media 46f. As a result, the cake-like sludge SG that has been dewatered and adhered to the outer surface of the strip-shaped filter media 46 is effectively separated by scratching with the bristles of the rotating brush 78.

[0044] Furthermore, the sludge dewatering and separation device 22 of this embodiment is provided with an injection nozzle 80 located downstream of the rotating brush 78 in the direction of movement of the forward-side strip-shaped filter media 46f, which separates the dewatered sludge SG adhering to the outer surface of the strip-shaped filter media 46 by injecting fluid from the inner surface of the strip-shaped filter media 46. As a result, the dewatered sludge SG adhering to the outer surface of the strip-shaped filter media 46 is separated from the strip-shaped filter media 46 by the injection of fluid from the inner surface of the strip-shaped filter media 46 by the injection of fluid from the inner surface of the strip-shaped filter media 46 by the injection nozzle 80.

[0045] Furthermore, in the sludge dewatering and separation device 22 of this embodiment, a clean tank 14 is located below the drum 36 to store the clean liquid CF filtered through the forward-side strip-shaped filter media 46f. Below the drum 36, there is a forward-side strip-shaped filter media 46f, which is sent sandwiched between the mesh belt 38 and a pair of circular members 32a and 32b of the endless annular strip-shaped filter media 46, and a return-side strip-shaped filter media 46b that has passed through the sludge dewatering and separation device 22. A receiving trough member 86 is also provided, which is located between the forward-side strip-shaped filter media 46f and the return-side strip-shaped filter media 46b, and is used to receive the dirty liquid DF that remains on the strip-shaped filter media 46 inside the drum 36 and guide the clean liquid CF that has passed downward through the forward-side strip-shaped filter media 46f to the clean tank 14. As a result, the clean liquid CF, which is filtered by passing downward from the dirty liquid through the forward-side strip-shaped filter media 46f, is stored in the clean tank 14 without passing through the return-side strip-shaped filter media 46b, thus preventing the sludge SG remaining on the forward-side strip-shaped filter media 46b from moving into the clean tank 14.

[0046] Furthermore, according to the sludge dewatering and separation device 22 of this embodiment, a sludge collection container 18 opening upwards is positioned below the sludge dewatering and separation device 22 to receive the sludge SG that is separated from the strip-shaped filter material 46 by the rotating brush 78 and the injection nozzle 80 and falls down. As a result, the sludge SG separated from the strip-shaped filter material 46 is collected in the sludge collection container 18.

[0047] Furthermore, the sludge dewatering and separation apparatus 22 of this embodiment includes a liquid level sensor 68 for detecting the liquid level of the dirty liquid DF remaining on the strip-shaped filter media 46 in the drum 36, a feed motor M for feeding the strip-shaped filter media 46, and a motor control device 70 for driving the feed motor M to feed the strip-shaped filter media 46 so that the liquid level of the dirty liquid DF detected by the liquid level sensor 68 reaches a preset liquid level. As a result, the strip-shaped filter media 46 is fed without excess or deficiency so as to maintain the liquid level of the remaining dirty liquid DF, thereby maintaining a high filtration efficiency of the strip-shaped filter media 46 while ensuring that the strip-shaped filter media 46 is fed without excess or deficiency. [Examples]

[0048] In the following description, the main parts of a sludge dewatering and separation apparatus 24, which is different from the sludge dewatering and separation apparatus 22, will be explained using the schematic diagram in Figure 9. In the following description, parts common to the previously described embodiment will be denoted by the same reference numerals and their explanation will be omitted.

[0049] In Figure 9, the sludge dewatering and separation device 24 is equipped with a relatively small diameter guide roller 108, for example 30 mmφ or less, preferably 20 mmφ or less, which guides the forward-side strip-shaped filter media 46f, which is fed out from the drive roller 42 of the filter feeding device 40, as it returns to the driven roller 44a of the filter feeding device 40 as the return-side strip-shaped filter media 46b, by rotating it at an acute turning angle α. In the direction of movement of the forward-side strip-shaped filter media 46f, the clamping roller 72 is located upstream of the guide roller 108, and the rotating brush 78 and spray nozzle 80 are located downstream of the guide roller 108. The turning angle α is preferably 60° or less, and even more preferably 30° or less, because a smaller turning angle α results in larger cracks in the sludge SG.

[0050] In the sludge dewatering and separation apparatus 24 of this embodiment, before the forward-side strip-shaped filter media 46f reaches the guide roller 108, the sludge SG adhering to the outer surface of the forward-side strip-shaped filter media 46f is dewatered by the clamping roller 72 and formed into a cake-like form. Furthermore, cracks are formed in the sludge due to the sharp angle of turning as the forward-side strip-shaped filter media 46f passes through the guide roller 108, thereby increasing the efficiency of sludge SG removal from the strip-shaped filter media 46 by the rotating brush 78 and the injection nozzle 80.

[0051] Although one embodiment of the present invention has been described above with reference to the drawings, the present invention is also applicable to other embodiments.

[0052] For example, in the above-described embodiment, a pair of clamping rollers 72 were provided to clamp the strip-shaped filter material 46 in order to remove sludge from the strip-shaped filter material 46f on the forward path side, but multiple pairs of clamping rollers 72 may be provided.

[0053] Furthermore, in the above-described embodiment, the drum 36 was formed by a pair of circular members 32a and 32b connected by a rod-shaped connecting member 34. However, the circular members 32a and 32b may not be disc-shaped, but rather circular members connected by a plurality of radial members fitted between a hub and a ring-shaped member.

[0054] It should be noted that the above-described embodiment is merely one example, and the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art. [Explanation of Symbols]

[0055] 10: Filtration device (drum-type filtration device using strip-shaped filter media) 14: Clean Tank 22, 24: Sludge dewatering and separation apparatus 32a, 32b: A pair of circular members 36: Drums 38: Mesh belt 40: Filter feeder 46: Strip-shaped filter media 46f: Forward path strip-shaped filter media 46b: Return path strip-shaped filter media 72: Clamping Roller 78: Rotating brush 80: Spray nozzle 86:Gutter parts 108: Guide roller

Claims

1. A filter feeding device 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; an endless annular mesh belt running along half the circumference of the lower outer circumference of the pair of circular members; an endless annular strip of filter material being fed by the filter feeding device with a portion of it sandwiched between the mesh belt and the pair of circular members; a sludge removal and separation device for separating sludge adhering to the outer surface of the strip of filter material fed out from the filter feeding device; and a device positioned below the drum that filters the strip of filter material through it. A drum-type filtration device using a strip-shaped filter material, comprising: a clean tank for storing the passed coolant; a forward-side strip-shaped filter material, of the endless annular strip-shaped filter material, which is sandwiched between the mesh belt and the pair of circular members and transported; a return-side strip-shaped filter material that has passed through the sludge deliquidation and separation device; and a receiving trough member disposed between the forward-side strip-shaped filter material and the return-side strip-shaped filter material on the lower side of the drum, which receives the clean liquid that has passed downward through the forward-side strip-shaped filter material from the dirty liquid accumulated on the forward-side strip-shaped filter material inside the drum, to guide it to the clean tank. The sludge dewatering and separation apparatus comprises a pair of clamping rollers that continuously clamp the sludge accumulated on the outer surface of the strip-shaped filter material sent from the filter feeding device, and a guide roller positioned downstream of the pair of clamping rollers in the direction of movement of the strip-shaped filter material, which guides the strip-shaped filter material sent from the pair of clamping rollers in a curved, acute-angle direction, thereby forming cracks in the cake-like sludge attached to the outer surface of the strip-shaped filter material after dewatering. The guide roller has a smaller diameter than the clamping roller and guides the strip-shaped filter material that is fed out from the pair of clamping rollers. A drum-type filtration device using a strip-shaped filter material, characterized by the features described above.

2. The sludge dewatering and separation apparatus includes a rotating brush positioned downstream of the guide roller in the direction of movement of the strip-shaped filter material discharged from the filter feeding device, which separates the cake-like sludge adhering to the outer surface of the strip-shaped filter material after dewatering from the strip-shaped filter material. A drum-type filtration device using the strip-shaped filter material according to feature 1.

3. The sludge dewatering and separation apparatus includes an injection nozzle positioned downstream of the rotating brush in the direction of movement of the strip-shaped filter material, which separates the sludge adhering to the outer surface of the strip-shaped filter material after dewatering by injecting fluid from the inner surface of the strip-shaped filter material. A drum-type filtration device using the strip-shaped filter material according to feature 2.

4. The guide roller has a diameter of 30 mm or less and guides the strip-shaped filter material in an acute angle direction of 60° or less. A drum-type filtration device using the strip-shaped filter material according to feature 1.

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