Solid-liquid separator and method for cleaning endless belt of solid-liquid separator

Abstract

To provide a solid-liquid separation device which can remove foreign objects on an endless belt and attain sufficient cleaning effect when the endless belt is cleaned.SOLUTION: A solid-liquid separation device separates a solid from a liquid while transporting a processed object with a rotatable endless belt 7 and has a cleaning device 9 for cleaning the endless belt 7. The cleaning device 9 has: first jet nozzles 22, 25 for jetting a cleaning fluid 8 to the endless belt 7 vertically; and a second jet nozzle 26 for jetting the cleaning fluid 8 obliquely toward the endless belt 7. A second jet area 45 of the cleaning fluid 8 jetted from the second jet nozzle 26 to the endless belt 7 is located at the upstream side going back in an opposite direction B of a travel direction A of the endless belt 7 relative to a first jet area 44 of the cleaning fluid 8 jetted from the first jet nozzles 22, 25 to the endless belt 7.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a solid-liquid separator that separates solid and liquid while transporting a material to be treated using a water-permeable, rotatable endless belt, and a method for cleaning the endless belt of the solid-liquid separator. [Background technology]

[0002] A conventional solid-liquid separator of this type is, for example, a dehydrator described in Patent Document 1. The dehydrator has a rotatable endless filter cloth supported by a plurality of pulleys and a washing device for washing the filter cloth. The washing device has a washing liquid supply pipe that is rotatable about its axis and a nozzle provided in the washing liquid supply pipe.

[0003] According to this, the cleaning liquid is supplied to the cleaning liquid supply pipe and sprayed onto the filter cloth from the nozzle, thereby removing foreign matter adhering to the filter cloth.

[0004] In this case, by rotating the cleaning liquid supply pipe, the direction of the nozzle can be changed, and the direction in which the cleaning liquid is sprayed onto the filter cloth can be changed. For example, by spraying the cleaning liquid perpendicularly from the nozzle onto the filter cloth, the force with which the cleaning liquid collides with the filter cloth is increased, improving the cleaning effect. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2022-102233 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional type described above, when the cleaning liquid is sprayed vertically from the nozzle toward the filter cloth, the force with which the cleaning liquid collides with the filter cloth increases, and if there is foreign matter on the surface of the filter cloth, the foreign matter may become embedded in the filter cloth and not be removed, or the filter cloth may be damaged.

[0007] Furthermore, if the nozzle is turned so that the cleaning liquid is sprayed diagonally from the nozzle toward the filter cloth, the cleaning liquid will hit the foreign matter present on the surface of the filter cloth, causing it to fly off and be removed, but the strength with which the cleaning liquid collides with the filter cloth will be reduced, which may result in a reduced cleaning effect.

[0008] An object of the present invention is to provide a solid-liquid separation device and a cleaning method for an endless belt of a solid-liquid separation device that can remove foreign matter from the endless belt and achieve a sufficient cleaning effect when cleaning the endless belt. [Means for solving the problem]

[0009] In order to achieve the above object, the first invention is a solid-liquid separation device that separates a material into solid and liquid while conveying the material using a water-permeable, rotatable endless belt, A cleaning device for cleaning the endless belt is provided. The cleaning device has a first spray nozzle that sprays cleaning liquid perpendicularly toward the endless belt and a second spray nozzle that sprays cleaning liquid obliquely toward the endless belt, a second spray area of ​​the cleaning liquid sprayed from the second spray nozzle onto the endless belt is located upstream of a first spray area of ​​the cleaning liquid sprayed from the first spray nozzle onto the endless belt in a direction opposite to the traveling direction of the endless belt, The direction in which the cleaning liquid is sprayed from the second spray nozzle is inclined toward the upstream side, in the opposite direction to the traveling direction of the endless belt, relative to the direction in which the cleaning liquid is sprayed from the first spray nozzle.

[0010] According to this, the material to be treated supplied onto the endless belt is subjected to solid-liquid separation while being transported by the endless belt, and then discharged from the endless belt. In addition, the endless belt is cleaned by spraying a cleaning liquid onto the endless belt from the first spray nozzle and the second spray nozzle.

[0011] In this case, by spraying the cleaning liquid from the first spray nozzle perpendicularly toward the endless belt, the force with which the cleaning liquid collides with the endless belt increases, improving the cleaning effect.

[0012] In addition, in the second spray area located upstream of the first spray area, foreign matter on the endless belt is blown away and removed by cleaning liquid sprayed obliquely from the second spray nozzle toward the endless belt. As a result, immediately after the foreign matter on the endless belt is removed, cleaning liquid is sprayed perpendicularly from the first spray nozzle toward the endless belt, preventing the foreign matter from becoming embedded in the endless belt. Since foreign matter can be prevented from becoming embedded in the endless belt in this way, the pressure of the cleaning liquid sprayed from the first spray nozzle toward the endless belt can be increased, further improving the cleaning effect.

[0013] In the solid-liquid separator according to the second invention, the second injection area is formed linearly on the endless belt and is inclined toward the traveling direction of the endless belt with respect to the width direction of the endless belt.

[0014] According to this, by spraying the cleaning liquid onto the endless belt from the second spray nozzle, foreign matter on the endless belt is blown across the width of the endless belt relative to the traveling direction of the endless belt, thereby removing foreign matter on the endless belt upstream of the first spray area in the opposite direction to the traveling direction of the endless belt.

[0015] In the solid-liquid separator according to the third aspect of the present invention, the washing device is movable in the width direction of the endless belt.

[0016] This allows for easy cleaning of even wide endless belts by moving the cleaning device in the width direction of the endless belt while rotating the endless belt. Furthermore, by moving the cleaning device to one of the side edges in the width direction of the endless belt, maintenance and inspection of the cleaning device can be easily performed on even wide endless belts.

[0017] In the solid-liquid separation device according to the fourth aspect of the present invention, the first jet nozzle and the second jet nozzle are provided in a common header, A cleaning liquid supply device that supplies cleaning liquid to the header is connected to the header.

[0018] This allows the first injection nozzle and the second injection nozzle to be disposed together in one location, making it possible to make the cleaning device have a simple and compact configuration.

[0019] In the solid-liquid separation device of the fifth invention, the spray angle of the cleaning liquid sprayed from the second spray nozzle onto the endless belt in the longitudinal direction of the endless belt is set within the range of 20° to 60° relative to the endless belt.

[0020] According to this, by setting the spray angle of the second spray nozzle within the range of 20° to 60°, a sufficient distance can be secured between the second spray nozzle and the endless belt, and when the workpiece is transported by the endless belt, it is possible to prevent the workpiece from interfering with the second spray nozzle and to sufficiently blow away foreign matter on the endless belt.

[0021] If the spray angle of the second spray nozzle is set to less than 20°, the second spray nozzle must be brought close to the endless belt in order to achieve sufficient foreign matter removal, and there is a risk that the treated material will interfere with the second spray nozzle when transported by the endless belt.

[0022] Furthermore, if the spray angle of the second spray nozzle is set to be greater than 60°, it may become difficult for the cleaning liquid sprayed from the second spray nozzle to sufficiently blow away foreign matter on the endless belt.

[0023] The sixth invention is a method for cleaning an endless belt in a solid-liquid separation device that separates solids and liquids while transporting a material to be treated using a water-permeable, rotatable endless belt, comprising: The cleaning liquid is sprayed from the first spray nozzle perpendicularly toward the endless belt, and from the second spray nozzle obliquely toward the endless belt, a second spray area of ​​the cleaning liquid sprayed from the second spray nozzle onto the endless belt is located upstream of a first spray area of ​​the cleaning liquid sprayed from the first spray nozzle onto the endless belt in a direction opposite to the traveling direction of the endless belt; The direction in which the cleaning liquid is sprayed from the second spray nozzle is inclined toward the upstream side, in the opposite direction to the traveling direction of the endless belt, relative to the direction in which the cleaning liquid is sprayed from the first spray nozzle.

[0024] According to this, by spraying the cleaning liquid from the first spray nozzle perpendicularly toward the endless belt, the force with which the cleaning liquid collides with the endless belt increases, improving the cleaning effect.

[0025] In addition, in a second spray area located upstream of the first spray area, foreign matter on the endless belt is blown away and removed by cleaning liquid sprayed obliquely from the second spray nozzle toward the endless belt. As a result, immediately after the foreign matter on the endless belt is removed, cleaning liquid is sprayed perpendicularly from the first spray nozzle toward the endless belt, preventing the foreign matter from becoming embedded in the endless belt.

[0026] The method for cleaning the endless belt of the solid-liquid separator in the seventh aspect of the present invention involves moving the first jet nozzle and the second jet nozzle together in the width direction of the endless belt.

[0027] According to this, even a wide endless belt can be easily cleaned by integrally moving the first and second jet nozzles in the width direction of the endless belt while rotating the endless belt. Also, by integrally moving the first and second jet nozzles to the side ends in the width direction of the endless belt, maintenance and inspection of the first and second jet nozzles can be easily performed even on a wide endless belt. [Effects of the Invention]

[0028] As described above, according to the present invention, when cleaning an endless belt, it is possible to remove foreign matter from the endless belt and to obtain a sufficient cleaning effect. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a schematic diagram showing the configuration of a belt-type concentrator according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic perspective view of a cleaning device for the belt-type concentrator of the first embodiment. [Figure 3] FIG. 2 is a partially enlarged plan view of the endless belt of the belt-type concentrator of the first embodiment. [Figure 4] FIG. 4 is a view taken along the arrow XX in FIG. 3. [Figure 5] FIG. 2 is a partially cutaway front view of the cleaning device of the belt-type concentrator as viewed from the traveling direction of the endless belt. [Figure 6] FIG. 6 is a view taken along the arrow XX in FIG. 5. [Figure 7] FIG. 6 is a view taken along the arrow YY in FIG. 5. [Figure 8] FIG. 10 is a plan view showing first and second spray areas when cleaning water is sprayed onto the endless belt from the first and second spray nozzles of the cleaning device of the belt-type concentrating device in the first embodiment. [Figure 9] FIG. 10 is a schematic plan view showing first and second spray nozzles and first and second spray areas of a cleaning device of a belt-type concentrating device according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a schematic plan view showing first and second spray nozzles and first and second spray areas of a cleaning device of a belt-type concentrating device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] (First embodiment) In the first embodiment, as shown in Fig. 1, reference numeral 1 denotes a belt-type concentrator, which is an example of a solid-liquid separation device. The belt-type concentrator 1 is used to filter, dehydrate, and concentrate sludge 2 (an example of a material to be treated) in, for example, a sewage treatment plant.

[0032] As shown in Figures 1 and 2, the belt-type concentrator 1 has a start end roller 5, an end end roller 6, a rotatable endless belt 7 wound between these rollers 5 and 6, a cleaning device 9 that sprays cleaning water 8 (an example of a cleaning liquid) onto the endless belt 7 to clean the endless belt 7, and a moving device 10 that moves the cleaning device 9 back and forth in the width direction W of the endless belt 7.

[0033] The start end roller 5 and the end end roller 6 are rotatably mounted on a frame 20, and the end end roller 6 is forcibly rotated by an electric motor (not shown).

[0034] As shown in Figures 3 and 4, the endless belt 7 is a mesh-like, water-permeable belt in which a plurality of metal wires 51, each spirally wound around the axis of the width direction W of the endless belt 7 and having different winding directions, are arranged in close contact with each other along the length direction L of the endless belt 7, and linear frame wires 52 are inserted through the overlapping metal wires 51 in the length direction L.

[0035] The endless belt 7 has numerous minute openings 53 that communicate with the front and back surfaces, and a plurality of internal voids 54, and the openings 53 are formed between three adjacent metal wires 51. As a result, the spiral metal wires 51 are connected to each other by the bone wires 52, and the endless belt 7 is flexible in the front and back directions and has stretchability in the length direction L.

[0036] Chains (not shown) are attached around the entire periphery of both side edges in the width direction W of the endless belt 7. Sprockets (not shown) are provided on both ends of the start roller 5 and on both ends of the end roller 6, and the sprockets of these rollers 5, 6 mesh with the chain of the endless belt 7. As a result, when the end roller 6 is driven to rotate, the rotational force is transmitted to the start roller 5 via the sprockets and chain, and the start roller 5 rotates in synchronization with the end roller 6, causing the endless belt 7 to rotate.

[0037] As shown in Figure 1, the path along which the endless belt 7 rotates includes a conveying path 12 that transports the sludge 2 from the starting end roller 5 to the terminal end roller 6, and a return path 13 that returns from the terminal end roller 6 to the starting end roller 5.

[0038] A plurality of support plates 14 are provided on the frame 20 to support from below the endless belt 7 that moves in the direction A of travel on the conveying path 12 .

[0039] At the start of the conveying path 12, a supply section 15 is provided that supplies the sludge 2 onto the endless belt 7. At the end of the conveying path 12, a discharge section 16 is provided that discharges the dehydrated and concentrated sludge 2 from the endless belt 7.

[0040] As shown in Figures 1, 2 and 5 to 7, the cleaning device 9 has a header 21 that supplies cleaning water 8, a plurality of first injection nozzles 22, 23, 24, 25 (for example, four in Figure 5) provided in the header 21, and one second injection nozzle 26 provided in the header 21.

[0041] The header 21 is a rectangular box-shaped member having a hollow portion 27, and is supported and guided by a guide member 28, so that it can freely move back and forth in the width direction W of the endless belt 7. The guide member 28 is supported by a plurality of support pillars 29, and is provided above the endless belt 7 across the width direction W.

[0042] A pair of engagement members 30, 31 that engage with the guide member 28 are provided on the upper part of the header 21. As shown in Fig. 7, each of the engagement members 30, 31 is a member with a U-shaped cross section that engages with the guide member 28 in the vertical direction and slides on the guide member 28 in the width direction W of the endless belt 7.

[0043] As shown in Figure 2, the moving device 10 has a pair of sprockets 33, 34 facing each other in the width direction W of the endless belt 7, a chain 35 wound between the sprockets 33, 34, and an electric motor 36 that rotates and drives one of the sprockets 33.

[0044] The chain 35 is stretched so as to cross the endless belt 7 in the width direction W. The header 21 is connected to the chain 35 on the path below the chain 35.

[0045] A cleaning liquid supply device 38 is connected to the header 21, which supplies cleaning water 8 to the hollow portion 27 within the header 21. The cleaning liquid supply device 38 has a supply pump 39, a flexible tube 40 connected between the header 21 and the supply pump 39, and a valve 41 provided on the tube 40.

[0046] The first spray nozzles 22, 23, 24, and 25 are nozzles that spray the cleaning water 8 supplied into the header 21 vertically toward the endless belt 7 on the conveying path 12.They are provided on the underside of the header 21, lined up in a row in the width direction W of the endless belt 7, and have spray holes that communicate with the hollow portion 27 of the header 21.

[0047] As shown in Figures 5 to 7, the second injection nozzle 26 is a nozzle that injects cleaning water 8 supplied into the header 21 obliquely toward the endless belt 7 on the conveying path 12, and has a first short pipe portion 26a protruding from the header 21 in a direction B opposite to the direction of travel A of the endless belt 7, a second short pipe portion 26b bent downward from the tip of the first short pipe portion 26a, a third short pipe portion 26c extending obliquely from the lower end of the second short pipe portion 26b with respect to the width direction W of the endless belt 7, a fourth short pipe portion 26d bent obliquely downward from the tip of the third short pipe portion 26c, and an injection hole formed at the tip of the fourth short pipe portion 26d.

[0048] As shown in Fig. 5, when the first spray nozzles 22, 23, 24, and 25 spray the cleaning water 8 onto the endless belt 7, the cleaning water 8 spreads slightly in a fan shape from the first spray nozzles 22, 23, 24, and 25 in the width direction W of the endless belt 7, and is sprayed onto a first spray area 44 (see imaginary line in Fig. 8) on the surface of the endless belt 7. Also, when the second spray nozzle 26 sprays the cleaning water 8 onto the endless belt 7 as shown in Fig. 5, the cleaning water 8 spreads in a fan shape from the second spray nozzle 26 in the width direction W of the endless belt 7, and is sprayed onto a second spray area 45 (see imaginary line in Fig. 8) on the surface of the endless belt 7, as shown in Fig. 6.

[0049] As shown in FIG. 8, the first injection area 44 is formed in a long, thin line shape along the width direction W of the endless belt 7.

[0050] The second spraying area 45 is located upstream of the first spraying area 44 in a direction B opposite to the traveling direction A of the endless belt 7. The second spraying area 45 is formed in a long, thin line shape on the endless belt 7, and is inclined at a predetermined angle G (for example, in a range of 5° to 60°) toward the traveling direction A of the endless belt 7 with respect to the width direction W of the endless belt 7.

[0051] As shown in FIG. 7, the spray angle C1 of the cleaning water 8 sprayed from the first spray nozzles 22 to 25 onto the endless belt 7 is set to 90° with respect to the endless belt 7 on the transport path 12.

[0052] As shown in Figure 7, the second spray direction 48 in which the cleaning liquid 8 is sprayed from the second spray nozzle 26 is inclined toward the upstream side in a direction B opposite to the traveling direction A of the endless belt 7, relative to the first spray direction 47 in which the cleaning liquid 8 is sprayed from the first spray nozzles 22 to 25.

[0053] The spray angle C2 of the cleaning water 8 sprayed from the second spray nozzle 26 onto the endless belt 7 in the length direction L of the endless belt 7 is set within the range of 20° to 60° with respect to the endless belt 7 on the conveying path 12. It is more preferable to set the spray angle C2 within the range of 30° to 45°.

[0054] As shown in FIG. 8, the width W2 of the second spraying area 45 in the width direction W of the endless belt 7 is larger than the width W1 of the first spraying area 44.

[0055] The operation of the above configuration will now be described.

[0056] As shown in Fig. 1, when sludge 2 is thickened, the terminal roller 6 is rotationally driven by an electric motor to rotate the endless belt 7 in one direction. By supplying the sludge 2 from the supply unit 15 onto the endless belt 7, the sludge 2 is subjected to gravity filtration (an example of solid-liquid separation) while being transported along the transport path 12, and is then discharged from the discharge unit 16. This thickens the sludge 2.

[0057] Thereafter, when the endless belt 7 is to be washed, the supply of the sludge 2 to the endless belt 7 is stopped, and the following washing method is carried out.

[0058] As shown in Fig. 2, while the endless belt 7 is rotating in one direction, the supply pump 39 of the cleaning liquid supply device 38 is operated and the valve 41 is opened. As a result, as shown in Figs. 5 to 8, cleaning water 8 is supplied from the supply pump 39 through the tube 40 to the hollow portion 27 in the header 21 of the cleaning device 9, and is sprayed vertically toward the endless belt 7 from the first spray nozzles 22, 23, 24, and 25, and is also sprayed obliquely toward the endless belt 7 from the second spray nozzle 26.

[0059] In this case, the second spraying area 45 is located upstream of the first spraying area 44 in a direction B opposite to the traveling direction A of the endless belt 7.

[0060] As described above, by spraying the cleaning water 8 vertically from the first spray nozzles 22, 23, 24, and 25 toward the endless belt 7, the force with which the cleaning water 8 collides with the endless belt 7 increases, and the cleaning water 8 penetrates the endless belt 7 from the front to the back, sufficiently removing the sludge 2 adhering to the endless belt 7, thereby improving the cleaning effect on the endless belt 7.

[0061] Furthermore, if foreign matter (such as paper, hair, fibers, food residue, etc.) is present on the endless belt 7, as shown in FIG. 6, in the second spraying area 45, the foreign matter is blown away to one side D in the width direction W of the endless belt 7 by cleaning water 8 sprayed toward the endless belt 7 from the second spraying nozzle 26, and is removed.

[0062] 8, foreign matter on the endless belt 7 can be removed upstream of the first spray area 44, and immediately after the foreign matter on the endless belt 7 is removed, cleaning water 8 is sprayed perpendicularly from the first spray nozzles 22, 23, 24, and 25 toward the endless belt 7. This prevents foreign matter from getting stuck in the endless belt 7, and increases the pressure of the cleaning water 8 sprayed from the first spray nozzles 22, 23, 24, and 25 toward the endless belt 7, further improving the cleaning effect.

[0063] In this manner, with cleaning water 8 sprayed toward the endless belt 7 from the first spray nozzles 22, 23, 24, 25 and the second spray nozzle 26, the endless belt 7 is rotated one or more times, and then, as shown in Figure 2, the electric motor 36 of the moving device 10 is driven to rotate the chain 35, and as shown in Figures 5 and 6, the header 21 of the cleaning device 9 is moved to one side D in the width direction W of the endless belt 7 by a distance equivalent to the width W1 (see Figure 8) of the first spray area 44.

[0064] In this state, the endless belt 7 is rotated one or more times, and then the header 21 of the cleaning device 9 is moved sequentially to one side D as described above, and this process is repeated.

[0065] This allows easy cleaning of the entire circumference and width of the endless belt 7, even if the endless belt 7 is wide. Also, as shown in Figure 2, by moving the header 21 to one side end 60 (or the opposite side end) of the endless belt 7 in the width direction W, maintenance and inspection of the cleaning device 9 can be easily performed even on a wide endless belt 7.

[0066] Furthermore, since the first jet nozzles 22, 23, 24, 25 and the second jet nozzle 26 are provided in one common header 21, the first jet nozzles 22, 23, 24, 25 and the second jet nozzle 26 can be concentrated in one location, allowing the cleaning device 9 to have a simple and compact configuration.

[0067] 7, the spray angle C2 of the cleaning water 8 sprayed from the second spray nozzle 26 onto the endless belt 7 is set within the range of 20° to 60°, which ensures a sufficient distance between the top and bottom of the tip of the second spray nozzle 26 and the endless belt 7. Therefore, as shown in FIG. 1, when the sludge 2 is transported by the endless belt 7, it is possible to prevent the sludge 2 from interfering with the second spray nozzle 26 and to sufficiently blow away foreign matter on the endless belt 7.

[0068] If the spray angle C2 is set to less than 20°, the tip of the second spray nozzle 26 must be brought close to the endless belt 7 in order to achieve sufficient foreign matter removal, and there is a risk that the sludge 2 will interfere with the second spray nozzle 26 when transported by the endless belt 7.

[0069] Furthermore, if the spray angle C2 were to be greater than 60°, it may become difficult for the cleaning water 8 sprayed from the second spray nozzle 26 to sufficiently blow away foreign matter on the endless belt 7.

[0070] In the first embodiment, as shown in Fig. 6, foreign objects are thrown to one side D in the width direction W of the endless belt 7 and the header 21 is moved to the one side D, but the foreign objects may be thrown to the other side E (see the dotted line in Fig. 6) opposite the one side D and the header 21 may be moved to the other side E (see the dotted line in Fig. 6). Also, the foreign objects may be thrown to the one side D and the header 21 may be moved to the other side E, or the foreign objects may be thrown to the other side E and the header 21 may be moved to the one side D.

[0071] In the first embodiment, as shown in Fig. 5, the header 21 is provided with a plurality of first injection nozzles 22, 23, 24, and 25, but only one may be provided. Also, the header 21 is provided with one second injection nozzle 26, but multiple nozzles may be provided.

[0072] (Second embodiment) In the first embodiment described above, the header 21 is configured to be freely movable in the width direction W of the endless belt 7 as shown in Figure 2, but in the second embodiment described below, the header 21 is fixed in the width direction W of the endless belt 7 as shown in Figure 9.

[0073] That is, the header 21 is provided above the endless belt 7 across the entire width of the endless belt 7. The header 21 is provided with a plurality of first injection nozzles 22-25, 71-74 and a plurality of second injection nozzles 26, 77-79.

[0074] The cleaning water 8 is sprayed from the first spray nozzles 22-25, 71-74 onto the first spray area 44 on the surface of the endless belt 7, and from the second spray nozzles 26, 77-79 onto multiple second spray areas 45, 81 on the surface of the endless belt 7.

[0075] The first spray area 44 is formed in a long, thin line shape across the entire width of the endless belt 7.

[0076] The second spray areas 45, 81 are located upstream of the first spray area 44 in the direction B opposite to the traveling direction A of the endless belt 7. In a plan view, the second spray areas 45, 81 are formed in an elongated linear shape across the entire width of the endless belt 7, and are inclined in a V-shape toward the traveling direction A of the endless belt 7 with respect to the width direction W of the endless belt 7.

[0077] This provides the same effects and advantages as the first embodiment.

[0078] (Third embodiment) The third embodiment described below is a modification of the second embodiment, and as shown in FIG. 10, a plurality of fixed headers 21, 85, and 86 are provided above the endless belt 7.

[0079] These headers 21, 85, 86 are provided with a plurality of first injection nozzles 22-25, 71-74 and a plurality of second injection nozzles 26, 77-79, 87, 88.

[0080] The cleaning water 8 is sprayed from the first spray nozzles 22-25, 71-74 onto multiple first spray areas 44, 90, 91 on the surface of the endless belt 7, and from the second spray nozzles 26, 77-79, 87, 88 onto multiple second spray areas 45, 81, 92, 93 on the surface of the endless belt 7.

[0081] The first injection areas 44, 90, 91 are each formed in an elongated linear shape along the width direction W of the endless belt 7.

[0082] The second spraying areas 45 and 81 are located upstream of the first spraying area 44 in the direction B opposite to the traveling direction A of the endless belt 7. Similarly, the second spraying area 92 is located upstream of the first spraying area 90 in the direction B opposite to the traveling direction A of the endless belt 7, and the second spraying area 93 is located upstream of the first spraying area 91 in the direction B opposite to the traveling direction A of the endless belt 7.

[0083] The second injection areas 45, 81, 92, and 93 are each formed in an elongated linear shape on the endless belt 7, and are inclined toward the traveling direction A of the endless belt 7 with respect to the width direction W of the endless belt 7.

[0084] This provides the same effects and advantages as the first embodiment.

[0085] In the above-described embodiments, the sludge 2 is given as an example of the material to be treated, but the material is not limited to the sludge 2.

[0086] In each of the above-described embodiments, as shown in FIG. 7, the spray angle C1 of the cleaning water 8 sprayed from the first spray nozzle 25 onto the endless belt 7 is set to 90°, but this is not limited to exactly 90° and may be approximately 90° (for example, within the range of 90°±15°).

[0087] In each of the above embodiments, cleaning water 8 is sprayed onto the endless belt 7 as an example of a cleaning liquid to clean it, but this is not limited to cleaning water 8, and a cleaning liquid made by mixing a chemical into water or the like may also be used.

[0088] In each of the above embodiments, a metal mesh belt is used as the endless belt 7, but the present invention can also be applied to belts other than metal mesh belts, such as resin mesh belts or punched belts. [Explanation of symbols]

[0089] 1 Belt-type concentrator (solid-liquid separator) 2. Sludge (material to be treated) 7 endless belt 8 Cleaning water (cleaning solution) 9 Cleaning equipment 21 Header 22, 23, 24, 25 First injection nozzle 26 Second injection nozzle 38 Cleaning liquid supply device 44 First injection area 45 Second injection area 71, 72, 73, 74 First injection nozzle 77, 78, 79 Second injection nozzle 85, 86 header 87, 88 Second injection nozzle 90, 91 First injection area 81, 92, 93 Second injection area A Direction of endless belt movement B Opposite direction C2 injection angle W Width direction of endless belt

Claims

1. A solid-liquid separation device that separates solids and liquids while transporting a material to be treated using a water-permeable, rotatable endless belt, A cleaning device for cleaning the endless belt is provided. The cleaning device has a first spray nozzle that sprays cleaning liquid perpendicularly toward the endless belt and a second spray nozzle that sprays cleaning liquid obliquely toward the endless belt, a second spray area of ​​the cleaning liquid sprayed from the second spray nozzle onto the endless belt is located upstream of a first spray area of ​​the cleaning liquid sprayed from the first spray nozzle onto the endless belt in a direction opposite to the traveling direction of the endless belt, a direction in which the cleaning liquid is sprayed from the second spray nozzle inclined toward the upstream side, in the opposite direction to the traveling direction of the endless belt, with respect to the direction in which the cleaning liquid is sprayed from the first spray nozzle.

2. 2. The solid-liquid separator according to claim 1, wherein the second spray area is formed linearly on the endless belt and is inclined toward the direction of travel of the endless belt with respect to the width direction of the endless belt.

3. 2. The solid-liquid separator according to claim 1, wherein the washing device is movable in the width direction of the endless belt.

4. The first injection nozzle and the second injection nozzle are provided in a common header, 2. The solid-liquid separator according to claim 1, wherein a cleaning liquid supply device for supplying a cleaning liquid to the header is connected to the header.

5. 2. The solid-liquid separation device according to claim 1, wherein the spray angle of the cleaning liquid sprayed from the second spray nozzle onto the endless belt in the longitudinal direction of the endless belt is set within a range of 20° to 60° with respect to the endless belt.

6. A method for cleaning an endless belt in a solid-liquid separation device that separates solids and liquids while transporting a material to be treated using a water-permeable, rotatable endless belt, comprising: The cleaning liquid is sprayed from the first spray nozzle perpendicularly toward the endless belt, and from the second spray nozzle obliquely toward the endless belt, a second spray area of ​​the cleaning liquid sprayed from the second spray nozzle onto the endless belt is located upstream of a first spray area of ​​the cleaning liquid sprayed from the first spray nozzle onto the endless belt in a direction opposite to the traveling direction of the endless belt; A method for cleaning an endless belt of a solid-liquid separator, characterized in that the direction in which the cleaning liquid is sprayed from the second spray nozzle is inclined toward the upstream side, in the opposite direction to the traveling direction of the endless belt, relative to the direction in which the cleaning liquid is sprayed from the first spray nozzle.

7. 7. The method for cleaning an endless belt of a solid-liquid separator according to claim 6, wherein the first spray nozzle and the second spray nozzle are moved integrally in the width direction of the endless belt.

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