JP7699569B2 - Drum-type filtration device using strip-shaped filter media - Google Patents

Description

The present invention relates to a drum-type filtration device that uses an endless annular band filter material that is continuously fed along the lower half of the drum and removes foreign matter contained in the coolant by passing the coolant through the band filter material.

In machining processes using grinding machines, cutting machines, and the like used in the manufacture of automobile parts, bearings, and the like, a drum-type filtration device has been proposed that passes dirty coolant (dirty liquid) used in machining or grinding processes 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 purified, clean liquid that can be reused. One example is the drum-type filtration device using a band-shaped filter material shown in Figures 1 to 9 of Patent Document 1.

The drum-type filtration device using the above-mentioned band-shaped filter material is equipped with a pair of circular members fixed at a predetermined distance from one another on a rotatable horizontal support shaft, a filter material feeder equipped with an endless annular mesh belt that runs along the lower half of the pair of circular members, and the band-shaped filter material that is continuously fed while sandwiched between the mesh belt and each of the circular members. As the band-shaped filter material is fed in the circumferential direction together with the pair of circular members and the mesh belt, dirty liquid is passed from the inner periphery to the outer periphery of the band-shaped filter material, resulting in purified coolant (clean liquid).

In the drum-type filtration device using a strip filter material as described in Figures 1 to 9 of Patent Document 1, the strip filter material for filtering the dirty liquid is pulled out from a roll on which unused strip filter material is wound and continuously sent while sandwiched between the mesh belt and each circular member, after which the used strip filter material is collected in a collection box. Since this strip filter material is disposable, there are problems in that the operating costs of the drum-type filtration device are high and the environmental load is large due to the disposal of used strip filter material.

JP 2001-314703 A

In response to this, FIG. 10 of Patent Document 1 describes a drum-type filtration device that uses an endless annular (endless) strip filter material, which can reduce the operating costs of the drum-type filtration device and reduce the environmental impact caused by disposing of used strip filter material. It is proposed that this drum-type filtration device be provided with a tank for collecting clean liquid, if there is sufficient space, on the inner side of the endless annular mesh belt and the endless annular strip filter material.

However, as shown in FIG. 10 of Patent Document 1, the lower half of the pair of circular members and the endless annular mesh belt and part of the endless annular band filter material wound around the lower half of the pair of circular members are housed in a tank, so the endless annular mesh belt and part of the endless annular band filter material wound around the lower half of the pair of circular members are immersed in the clean liquid stored in the tank. As a result, the area of the part of the endless annular band filter material wound around the lower half of the pair of circular members where there is no liquid pressure difference between the circular member side of the band filter material and the tank side of the band filter material becomes large, resulting in a problem of inability to obtain efficient filtration.

The present invention was made against the background of the above circumstances, and its purpose is to provide a drum-type filtration device that uses an endless annular mesh belt and an endless annular band-shaped filter material, which can obtain filtration efficiency without increasing the space on the inner circumference side of the endless annular mesh belt and the endless annular band-shaped filter material.

The inventor, after extensive research into drum-type filtration devices in light of the above circumstances, discovered that by providing a shallow box-shaped gutter member that receives the clean liquid and drains it into a clean tank instead of a tank installed on the inner circumference of the endless annular mesh belt and the endless annular band filter material, a drum-type filtration device using an endless annular band filter material that can obtain filtration efficiency can be obtained without increasing the space on the inner circumference of the endless annular mesh belt and the endless annular band filter material, because a portion of the endless annular mesh belt and the endless annular band filter material wrapped around the lower half of the pair of circular members is not immersed in the clean liquid in the gutter member. The present invention was made based on this knowledge.

That is, the gist of the first invention is a drum-type filtration device using a belt-shaped filter material, the drum-type filtration device including: (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 including an endless annular mesh belt that is fitted along half of the lower outer periphery of the pair of circular members; an endless annular belt-shaped filter material that is sandwiched between the mesh belt and the pair of circular members and fed by the filter feeding device; and a clean tank that stores clean liquid filtered by the belt-shaped filter material; (c) the receiving gutter member is provided below the drum on the inner side of the annular mesh belt and the endless annular band-shaped filter material, receives the clean liquid falling from the drum through the band-shaped filter material, and allows the clean liquid to flow out from the open end into the clean tank so that the liquid level does not come into contact with the band-shaped filter material; (c) the receiving gutter member is provided with a rectangular, longitudinal bottom plate that is longer than the width dimension in the direction of the rotation axis of the drum, and a pair of longitudinal edge plates that are each erected from side edges parallel to the longitudinal direction of the bottom plate; and (d) the bottom plate of the receiving gutter member is arranged horizontally .

According to the drum-type filtration device using the belt-shaped filter material of the first invention, when the clean liquid that falls from the drum through the belt-shaped filter material is received by the receiving gutter member, the clean liquid flows out from the open end of the receiving gutter member to the clean tank so that the liquid surface of the clean liquid does not contact the belt-shaped filter material that is aligned along the lower outer circumference of the circular member over a half circumference. This eliminates the need to raise the receiving gutter member, and does not increase the space on the inner circumference side of the endless annular mesh belt and the endless annular belt-shaped filter material. Since the liquid surface of the clean liquid in the receiving gutter member does not contact the belt-shaped filter material that is aligned along the lower outer circumference of the circular member over a half circumference, the filtration efficiency of the clean liquid is obtained. In addition, since the open end is provided at least on one of both ends in the longitudinal direction of the receiving gutter member, the clean liquid in the receiving gutter member can flow out from the open end without stagnation. Furthermore, since the bottom plate of the receiving gutter member is horizontally arranged, the space on the inner circumference side of the endless annular mesh belt and the endless annular belt-shaped filter material is not increased.

The gist of the second invention is a drum-type filtration device using a strip filter material, the drum-type filtration device including: (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 feed device including an endless annular mesh belt that is fitted along half of the lower outer periphery of the pair of circular members; an endless annular strip filter material that is sandwiched between the mesh belt and the pair of circular members and fed by the filter feed device; and a clean tank that stores clean liquid filtered by the strip filter material; (b) a filter tank that is arranged such that a filter tank that is arranged so ... (c) the receiving gutter member is provided at a position below the drum, receives the clean liquid falling from the drum through the band-shaped filter material, and allows the clean liquid to flow out from the open end into the clean tank so that the liquid level of the clean liquid does not come into contact with the band-shaped filter material; (c) the receiving gutter member is provided with a rectangular and longitudinal bottom plate that is longer than the width dimension in the direction of the rotation axis of the drum , and a pair of longitudinal edge plates that are respectively erected from side edges parallel to the longitudinal direction of the bottom plate; and (d) the receiving gutter member is provided with a flushing nozzle that sprays the clean liquid from a base end, which is one of both longitudinal ends, toward the open end.
According to the drum-type filtration device using the belt-shaped filter material of the second invention, when the clean liquid that falls from the drum through the belt-shaped filter material is received by the receiving gutter member, the clean liquid flows out from the open end of the receiving gutter member to the clean tank so that the liquid surface of the clean liquid does not contact the belt-shaped filter material that is aligned along the lower outer periphery of the circular member over a half circumference. This makes it unnecessary to raise the receiving gutter member, and does not increase the space on the inner periphery of the endless annular mesh belt and the endless annular belt-shaped filter material, and since the liquid surface of the clean liquid in the receiving gutter member does not contact the belt-shaped filter material that is aligned along the lower outer periphery of the circular member over a half circumference, the filtration efficiency of the clean liquid is obtained. In addition, since the open end is provided at least on one of both ends in the longitudinal direction of the receiving gutter member, the clean liquid in the receiving gutter member can flow out from the open end without stagnation. Furthermore, the receiving gutter member is provided with a flushing nozzle that sprays the clean liquid from the base end of the receiving gutter member toward the open end. This allows sludge that tends to accumulate within the gutter member to flow out from the open end, thereby lengthening the interval between regular cleaning of the gutter member.

The gist of the third invention is that in the first or second invention, the receiving gutter member has a base edge plate that stands up from an edge of a base end, which is one of both longitudinal ends, and connects the pair of longitudinal edge plates, and the edge of a tip end, which is one of both longitudinal ends, has no edge plate standing up or, even if it does, is discontinuous so that the clean liquid can pass through, and the open end is formed. As a result, the clean liquid received in the receiving gutter member flows out exclusively from the open end.

The gist of the fourth invention is that in the first or second invention, the width dimension of the receiving gutter member is smaller than the diameter of the drum, and a pair of inclined liquid collecting plates are provided next to the receiving gutter member so as to receive the clean liquid that falls from the drum through the belt-shaped filter material and that cannot be received by the receiving gutter member and to flow it into the receiving gutter member. This makes it possible to make the width dimension of the belt-shaped filter material perpendicular to the longitudinal direction smaller than when the width dimension is set to receive all the clean liquid that falls from the drum through the belt-shaped filter material, which has the advantage of making it possible to make the drum-type filtration device smaller.

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. 2 is a cross-sectional view taken along line II-II of FIG. 1, illustrating a support shaft and a receiving gutter member that rotatably support the drum of the drum-type filtration device of FIG. 1. FIG. 2 is a cross-sectional view illustrating the configuration of the inflow buffer box. FIG. 2 is a plan view illustrating a receiving gutter member of the drum-type filtration device of FIG. 1 . FIG. 5 is a plan view showing a flush nozzle provided on the receiving gutter member of FIG. 4 . 5 is a plan view showing another example of a flush nozzle provided in the receiving gutter member of FIG. 4. FIG. 5 is a plan view showing another example of a flush nozzle provided in the receiving gutter member of FIG. 4. FIG. 5 is a plan view showing another example of a flush nozzle provided in the receiving gutter member of FIG. 4. FIG. 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.

The following describes in detail the embodiments of the present invention with reference to the drawings. Note that the drawings in the following embodiments are schematic diagrams that have been appropriately simplified, and the shapes and dimensional ratios of each part are not necessarily drawn accurately.

Figure 1 is a side view of a drum-type filter device (hereinafter referred to as filter 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 along a vertical plane passing through the center of the width of the filter device 10. In Figure 1, the filter device 10 is provided with a case 12 having a front wall 12c, a rear wall 12d, a pair of left and right side walls 12a, 12b connecting the front wall 12c and the rear wall 12d, a top 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, 12b, and a bottom wall 12f, on a clean tank 14 that stores purified coolant, i.e., clean liquid CF.

A notch 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 stores sludge SG is disposed below the notch 16. A partition wall 12g is provided within the case 12 to divide the case 12 into a front space S1 that stores the drum 36 and filter feed device 40, etc., and a rear space S2 that stores the sludge deliquescence separation device 22.

The filtration device 10 includes a cylindrical drum support shaft 30 that is hung horizontally between a pair of side walls 12a, 12b to rotatably support the drum 36, a cylindrical drum 36 in which a pair of circular members 32a, 32b rotatably supported by the drum support shaft 30 are connected to each other in a state where they face each other at a fixed interval via a longitudinal connecting member 34 of a predetermined length, and a filter feed device 40 that includes an endless annular mesh belt 38 that is fitted along half of the lower outer circumference of the pair of circular members 32a, 32b. The rotation center line CL of the drum 36 is also the center line of the cylindrical drum support shaft 30.

The filter feed device 40 is provided so as to surround the drum 36, and includes a drive roller 42 around which an endless circular 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 circular mesh belt 38 and the drum 36 are rotated. As a result, an endless circular band-shaped filter material 46, a part of which is sandwiched between the mesh belt 38 and the pair of circular members 32a and 32b, is fed by the filter feed device 40. The endless circular band-shaped filter material 46 is a band-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 a metal mesh, synthetic fiber, carbon fiber, or composite material having many meshes.

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, and the pair of driven rollers 44a, 44b are positioned at a height position below the drum 36 and at a predetermined distance apart in the horizontal direction. The strip filter material 46 sent from the filter feed device 40 to the sludge deliquescence separation device 22 returns to the lower side of the pair of driven rollers 44a, 44b, passes through the driven roller 44c, and is again sandwiched between the mesh belt 38 and the pair of circular members 32a, 32b.

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 filter material 46 inside the drum 36. As a result, the dirty liquid DF that remains on the strip filter material 46 inside the drum 36 is passed downward through the strip filter material 46, causing sludge SG to accumulate on the outer peripheral surface of the strip filter material 46.

Figure 2 is a vertical cross-sectional view of the drum support shaft 30 that rotatably supports the drum 36, taken along the line II-II of Figure 1. Figure 2 shows the state in which the mesh belt 38 and the band-shaped filter material 46 are not wound around the drum 36. As shown in Figure 2, the tip end (right end) 30a and the base end (left end) 30b of the cylindrical drum support shaft 30 are supported in a penetrating state 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 rotation axis C1, and the drum support shaft 30 is detachably attached to the case 12 by a push screw 50 provided to screw in the radial direction of the drum support shaft 30 to the support flange 48a on the tip end 30a side of the drum support shaft 30, among the support flanges 48a, 48b. A dirty pipe 52 that guides the coolant, i.e. dirty fluid DF, discharged from a grinding machine (not shown) is connected to the base end 30b of the drum support shaft 30, and the dirty fluid DF is allowed to flow into the case 12 from a longitudinal discharge port 30d formed in the middle part 30c in the longitudinal direction (direction of the rotation axis C1) of the drum support shaft 30.

The drum 36 is positioned on the drum support shaft 30 so as to be spaced apart 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.

An inflow buffer box 54 is attached to the middle part 30c of the drum support shaft 30 so as to cover the longitudinal discharge port 30d. The inflow buffer box 54 is detachably fixed by fastening ears 56a and 56b protruding from the inflow buffer box 54 in the direction of the rotation axis C1 to the drum support shaft 30 with bolts 60. The wire W is an electric wire that connects the liquid level sensor 68 shown in FIG. 1 to the motor control device 70.

Figure 3 is a cross-sectional view taken along line III-III of Figure 2, illustrating the inside of the inflow buffer box 54. As shown in Figure 3, the inflow buffer box 54 is a rectangular parallelepiped having a top plate 54e, a bottom plate 54f, a front plate 54c, and a rear plate 54d that are elongated horizontally longer than the discharge port 30d of the drum support shaft 30, and a pair of end plates 54a, 54b that close the elongated space enclosed by these from the right and left. The inflow buffer box 54 also has a slanted plate 62 that changes the flow direction of the dirty fluid DF, and a dam plate 64 of a predetermined height that suppresses the flow speed of the dirty fluid DF.

The inclined plate 62 of the inflow buffer box 54 is protruded obliquely downward from the lower edge of the front plate 54c toward the rear plate 54d, and receives the dirty fluid DF flowing down from the discharge port 30d of the drum support shaft 30 and changes its direction to the direction toward the rear plate 54d. The dam 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 fluid DF that falls from the inclined plate 62 and turns around from the rear plate 54d and flows on the bottom plate 54f, for example, in a direction parallel to the rotation axis C1, and suppresses the flow speed of the dirty fluid DF flowing along the bottom plate 54f. The inclined plate 62 and the dam plate 64 have a longitudinal shape equivalent to the longitudinal dimension of the inflow buffer box 54. Therefore, the inclined plate 62 and the dam plate 64 have a width dimension L2 that is larger than the longitudinal dimension L1 of the discharge port 30d.

Between the lower edge of the front plate 54c and the dam plate 64, the inflow buffer box 54 has an outlet 66 that opens longitudinally and allows the dirty liquid DF that has exceeded the dam plate 64 to flow out. In the inflow buffer box 54, the dirty liquid DF discharged from the discharge port 30d formed on the drum support shaft 30 is received by the slanted plate 62 and redirected, and then collides with the rear plate 54d and reverses direction, slowing down the flow rate. It is then retained by the dam plate 64 to eliminate turbulence, and then it is allowed to flow out from the outlet 66 beyond the dam plate 64. As a result, the dirty liquid DF that flows out from the outlet 66 of the inflow buffer box 54 is allowed to gently flow into the liquid surface L of the dirty liquid DF that is retained on the forward-side belt-shaped member 46f wrapped around the lower half of the drum 36.

Returning to FIG. 1, the filter feed 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 remaining on the strip filter material 46 inside the drum 36, and a motor control device 70 that controls the rotation of the drive roller 42. The amount of rotation of the drive roller 42 by the electric motor M is adjusted so that the liquid level detected by the liquid level sensor 68 becomes a preset liquid level height, thereby appropriately controlling the feed speed of the strip filter material 46.

The sludge deliquescence separation device 22 comprises a pair of clamping rollers 72 that continuously clamp the sludge SG accumulated on the outer peripheral surface of the band-shaped filter material 46 sent out in a substantially horizontal direction from the filter feed device 40 in the rear space S2, a pair of guide rollers 74 and 76 that are positioned diagonally below the clamping rollers 72 and spaced a predetermined distance apart in the vertical direction, a rotating brush 78 that separates the sludge SG accumulated on the outer peripheral surface of the band-shaped filter material 46 located between the pair of guide rollers 74 and 76 and that is in the form of a cake after being deliquified by the clamping rollers 72 from the outer peripheral surface of the band-shaped filter material 46, and a spray nozzle 80 that separates the sludge SG adhering to the outer peripheral surface of the band-shaped filter material 46 by spraying air or a fluid such as coolant from the inner peripheral surface of the band-shaped filter material 46 at a position downstream of the rotating brush 78. The clean liquid CF that falls from the clamping roller 72 through the belt-shaped filter material 46 due to the clamping of the sludge SG on the outer peripheral surface of the belt-shaped filter material 46 flows into the clean tank 14 through the clean liquid guide passage 84 from a side opening 82 formed through one of the side walls 12a and 12b.

In order to clamp the belt-shaped filter material 46 between the pair of clamping rollers 72, the pair of clamping rollers 72 is preferably configured so that at least one of the pair of clamping rollers 72 has an elastic member made of a material that can elastically deform 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 72 toward the other bearing.

As shown in Figures 1 and 2, below the drum 36, between the endless annular band filter material 46f, which is sandwiched between the mesh belt 38 and a pair of circular members 32a and 32b and fed to the rotating brush 78, and the return side band filter material 46b, which has passed through the rotating brush 78 of the sludge deliquor separation device 22 and is fed to the drum 36, a receiving gutter member 86 is horizontally arranged in the space on the inner circumference side of the endless annular mesh belt 38, by fitting it into a pair of mounting holes 88 formed through the side walls 12a and 12b of the filtration device 10, to receive the clean liquid CF that has fallen downward through the outward side band filter material 46f from the dirty liquid DF that has accumulated on the band filter material 46 in the drum 36.

The gutter member 86 has a longitudinal dimension that is greater than the distance between the side walls 12a and 12b, and when installed, the tip and base ends of the gutter member 86 protrude outward from a pair of mounting holes 88 formed in the side walls 12a and 12b, respectively. The gutter member 86 can be inserted and removed from the pair of mounting holes 88.

As shown in FIG. 1, the receiving gutter member 86 has a rectangular horizontal bottom plate 86a with a width dimension in the front-rear direction sufficiently smaller than the diameter of the drum 36, and as shown in FIG. 2 and FIG. 4, sufficiently larger than the width in the direction of the rotation axis C1 of the drum 36, a pair of longitudinal edge plates 86b of a predetermined height erected from the side edges of the bottom plate 86a, a base end edge plate 86c of the same height as the longitudinal edge plates 86b erected from the base end edge of the bottom plate 86a, and a plurality of flush nozzles 90 (five in this embodiment) fixed to the base end edge plate 86c at equal intervals in the width direction of the receiving gutter member 86 and toward the opening end 92, which is the tip end edge of the receiving gutter member 86. The flush nozzles 90 spray cleaning liquid CF toward the opening end 92, which is the tip end edge of the receiving gutter member 86, to move the sludge on the receiving gutter member 86.

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

The receiving gutter member 86 can only be positioned horizontally or at most gently inclined in the narrow space directly below the drum 36 within the endless annular mesh belt 38 and band-shaped filter material 46, making it easy for sludge SG to accumulate. Therefore, the clean liquid CF in the clean tank 14, pumped by the electric pump 96, is sprayed from the flush nozzle 90 toward the tip edge of the receiving gutter member 86. As a result, even if the height of the receiving gutter member 86 is small, the clean liquid CF can be flowed into the clean tank 14, making it possible to reduce the space between the drum 36 and the clean tank 14 and to configure the filtration device 10 in a compact manner.

The width dimension of the receiving gutter member 86 perpendicular to the longitudinal direction is smaller than the diameter of the drum 36, and a pair of inclined liquid collecting plates 98 approaching each other as they move downward so as to receive the clean liquid CF that falls downward from the drum 36 through the forward-side belt-shaped filter material 46f and that cannot be received by the receiving gutter member 86 and pour it into the receiving gutter member 86 are fixed to a pair of side walls 12a, 12b in a side-by-side state located on both sides of the receiving gutter member 86 in the front-to-rear direction of the drum-type filtration device 10. The pair of liquid collecting plates 98 are inclined so as to approach each other as they move downward.

Figure 5 is an enlarged plan view of the flush nozzle 90. This flush nozzle 90 sprays the cleaning liquid CF in a straight line toward the tip edge of the receiving gutter member 86, so five circular cross-sectional spray lines are formed in parallel from the multiple flush nozzles 90. Instead of this flush nozzle 90, a flush nozzle 100 shown in Figure 6, a flush nozzle 102 shown in Figure 7, or a flush nozzle 104 shown in Figure 8 may be used. The flush nozzle 100 sprays the cleaning liquid CF radially. In this case, the number of flush nozzles 100 can be reduced. The flush nozzle 102 sprays the cleaning liquid CF with a flat cross section. In this case, a spray effective for moving the sludge SG can be obtained, so the amount of sprayed cleaning liquid CF can be reduced. The flush nozzle 104 sprays the cleaning liquid CF in a wide spray line arranged in a flat comb shape. In this case, the number of flush nozzles 104 can be reduced, and the amount of sprayed cleaning liquid CF can be reduced.

As described above, according to the filtration device 10 of this embodiment, when the clean liquid CF that falls from the drum 36 through the belt-shaped filter material 46 is received by the receiving gutter member 86, the clean liquid CF is allowed to flow out from the opening end 92 of the receiving gutter member 86 to the clean tank 14 so that the liquid surface of the clean liquid CF does not come into contact with the belt-shaped filter material 46 that is aligned along the lower outer periphery of the circular members 32a and 32b over half the circumference. This makes it unnecessary to raise the receiving gutter member 86, and does not increase the space on the inner periphery of the endless annular mesh belt 38 and the endless annular belt-shaped filter material 46. In addition, since the liquid surface of the clean liquid CF in the receiving gutter member 86 does not come into contact with the belt-shaped filter material 46 that is aligned along the lower outer periphery of the circular members 32a and 32b over half the circumference, the filtration efficiency of the clean liquid is obtained.

In addition, according to the filtration device 10 of this embodiment, the receiving gutter member 86 is provided with a rectangular and longitudinal bottom plate 86a that is longer than the width dimension in the rotation axis direction of the drum 36, and a pair of longitudinal edge plates 86b that are erected from side edges parallel to the longitudinal direction of the bottom plate 86a. As a result, an open end 92 is provided on at least one of both longitudinal ends of the receiving gutter member 86, so that the clean liquid CF in the receiving gutter member 86 can flow out from the open end 92 without stagnation.

In addition, according to the filtration device 10 of this embodiment, the receiving gutter member 86 is provided with a base end edge plate 86c that is erected from the edge of the base end, which is one of both longitudinal ends, and connects a pair of longitudinal edge plates 86b, and at the edge of the tip end, which is one of both longitudinal ends, either no edge plate is erected or, even if it is erected, the height of the edge plate is discontinuously lowered to allow the clean liquid to pass through, forming an open end 92. As a result, the clean liquid CF received in the receiving gutter member 86 flows out exclusively from the open end 92.

In addition, according to the filtration device 10 of this embodiment, the bottom plate 86a of the receiving gutter member 86 is arranged horizontally. This prevents the space on the inner periphery of the endless annular mesh belt 38 and the endless annular band-shaped filter material 46 from increasing.

In addition, according to the filtration device 10 of this embodiment, the receiving gutter member 86 is provided with a flushing nozzle 90 that sprays cleaning liquid CF from the base end of the receiving gutter member 86 toward the open end. This allows sludge SG that tends to accumulate in the receiving gutter member 86 to flow out from the open end 92, making it possible to extend the cycle of regular cleaning of the receiving gutter member 86.

In addition, according to the filtration device 10 of this embodiment, multiple flushing nozzles 90 are fixed to the base end side edge plate 86c erected on the edge of the base end of the receiving gutter member 86. This allows the flushing nozzles 90 to be removed from the drum-type filtration device 10 together with the receiving gutter member 86.

In addition, according to the filtration device 10 of this embodiment, the width dimension of the receiving gutter member 86 is smaller than the diameter of the drum 36, and a pair of inclined liquid collecting plates 98 are provided adjacent to the receiving gutter member 86 so as to receive the clean liquid CF that falls from the drum 36 through the strip filter material 46 and not received by the receiving gutter member 86 and to pour it into the receiving gutter member 86. This allows the width dimension perpendicular to the longitudinal direction of the strip filter material 86 to be smaller than when the dimension is set to receive all of the clean liquid CF that falls from the drum 36 through the strip filter material 46, which has the advantage of allowing the drum-type filtration device 10 to be made smaller.

Below, the main parts of the sludge deliquescence separation device 24, which is different from the sludge deliquescence separation device 22, will be explained using the schematic diagram of Figure 9. In the following explanation, parts that are common to the above-mentioned embodiment will be given the same reference numerals and explanations will be omitted.

In FIG. 9, the sludge deliquescence separation device 24 is provided with a guide roller 108 having a relatively small diameter, for example, 30 mmφ or less, preferably 20 mmφ or less, which guides the outgoing side belt-shaped filter material 46f as it returns to the driven roller 44a of the filter feeding device 40 as the return side belt-shaped filter material 46b. In the moving direction of the outgoing side belt-shaped filter material 46f, the clamping roller 72 is provided at a position upstream of the guide roller 108, and the rotating brush 78 and the injection nozzle 80 are provided at a position downstream of the guide roller 108. The smaller the bending angle α, the larger the cracks that occur in the sludge SG, so it is preferably 60° or less, more preferably 30° or less.

In the sludge deliquification and separation device 24 of this embodiment, before the forward-side band filter material 46f reaches the guide roller 108, the sludge SG adhering to the outer peripheral surface of the forward-side band filter material 46f is deliquified by the clamping roller 72 and turned into a cake. In addition, the acute angle of the forward-side band filter material 46f as it passes through the guide roller 108 causes cracks to form in the sludge, improving the efficiency with which the rotating brush 78 and the spray nozzle 80 peel off the sludge SG from the band filter material 46.

One embodiment of the present invention has been described above with reference to the drawings, but the present invention can also be applied in other aspects.

For example, in the above embodiment, the receiving gutter member 86 was horizontal, but it may be tilted to some extent so that the open end 92 is lower.

In addition, in the above-described embodiment, the opening end 92 of the receiving gutter member 86 was provided at one of the longitudinal ends of the receiving gutter member 86, but it may be provided at both ends.

In the above embodiment, five flush nozzles 90 were provided on the receiving gutter member 86, but this does not necessarily have to be five, and it may be four or less, or may not be provided at all.

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

10: Filtration device (drum-type filtration device using strip-shaped filter material)
14: Clean tank 30: Drum support shafts 32a, 32b: Circular member 36: Drum 38: Mesh belt 40: Filter feed device 46: Strip-shaped filter material 72: Pressure roller 86: Receiving gutter member 86a: Bottom plate 86b: Longitudinal edge plate 86c: Base end edge plate 88: Mounting holes 90, 100, 102, 104: Flush nozzle 92: Open end 98: Liquid collecting plate

Claims (4)

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 feed device having an endless annular mesh belt that is fitted along half of the lower outer periphery of the pair of circular members; an endless annular strip filter material that is sandwiched between the mesh belt and the pair of circular members and fed by the filter feed device; and a clean tank that stores clean liquid filtered by the strip filter material,
A receiving gutter member is provided below the drum on the inner circumferential side of the endless annular mesh belt and the endless annular band-shaped filter material, receives the clean liquid that falls from the drum through the band-shaped filter material, and has an open end that allows the clean liquid to flow into the clean tank so that the liquid level of the clean liquid does not come into contact with the band-shaped filter material .
The gutter member includes a rectangular, longitudinal bottom plate that is longer than the width dimension in the direction of the rotation axis of the drum, and a pair of longitudinal edge plates that are erected from side edges of the bottom plate that are parallel to the longitudinal direction,
A drum-type filtration device using a strip-shaped filter material, characterized in that the bottom plate of the receiving gutter member is arranged horizontally . 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 feed device having an endless annular mesh belt that is fitted along half of the lower outer periphery of the pair of circular members; an endless annular strip filter material that is sandwiched between the mesh belt and the pair of circular members and fed by the filter feed device; and a clean tank that stores clean liquid filtered by the strip filter material,
A receiving gutter member is provided below the drum on the inner circumferential side of the endless annular mesh belt and the endless annular band-shaped filter material, receives the clean liquid that falls from the drum through the band-shaped filter material, and has an open end that allows the clean liquid to flow into the clean tank so that the liquid level of the clean liquid does not come into contact with the band-shaped filter material.
The gutter member includes a rectangular, longitudinal bottom plate that is longer than the width dimension in the direction of the rotation axis of the drum, and a pair of longitudinal edge plates that are erected from side edges of the bottom plate that are parallel to the longitudinal direction ,
a flushing nozzle is provided on the receiving gutter member for spraying the cleaning liquid from a base end, which is one of both longitudinal ends, toward the opening end . A drum-type filtration device using a strip-shaped filter material as claimed in claim 1 or 2, characterized in that the receiving gutter member has a base end edge plate that is erected from the edge of the base end, which is one of the two longitudinal end portions, and connects the pair of longitudinal edge plates, and the opening end is formed on the edge of the tip end, which is one of the two longitudinal end portions. A drum-type filtration device using a strip-shaped filter material as described in claim 1 or 2, characterized in that the width dimension of the receiving gutter member is smaller than the diameter of the drum, and a pair of inclined collecting plates are provided next to the receiving gutter member so as to receive the clean liquid that falls from the drum through the strip-shaped filter material and that is not received by the receiving gutter member and flow it into the receiving gutter member.

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