JP2024080711A - Solid-liquid separation device and method for cleaning endless belt of solid-liquid separation device - Google Patents

Abstract

[Problem] To provide a solid-liquid separation device capable of removing foreign matter on an endless belt and achieving a sufficient cleaning effect when cleaning the endless belt. [Solution] A solid-liquid separation device for performing solid-liquid separation while transporting a workpiece with a rotatable endless belt 7, comprising a cleaning device 9 for cleaning the endless belt 7, the cleaning device 9 having first jet nozzles 22, 25 for spraying a cleaning liquid 8 perpendicularly toward the endless belt 7 and a second jet nozzle 26 for spraying the cleaning liquid 8 obliquely toward the endless belt 7, the second jet area 45 of the cleaning liquid 8 sprayed from the second jet nozzle 26 onto the endless belt 7 being located upstream in a direction B opposite to the traveling direction A of the endless belt 7, relative to a first jet area 44 of the cleaning liquid 8 sprayed from the first jet nozzles 22, 25 onto the endless belt 7. [Selected Figure] Figure 2

Description

The present invention relates to a solid-liquid separation device that separates solid and liquid while transporting the material to be treated using a water-permeable, rotatable endless belt, and a method for cleaning the endless belt of the solid-liquid separation device.

A conventional solid-liquid separation device of this type is, for example, a dehydrator described in Patent Document 1 below. The dehydrator has a rotatable endless filter cloth supported by multiple pulleys, and a cleaning device for cleaning the filter cloth. The cleaning device has a cleaning liquid supply pipe that can rotate around its axis, and a nozzle provided on the cleaning liquid supply pipe.

According to this, foreign matter adhering to the filter cloth is removed by supplying the cleaning liquid to the cleaning liquid supply pipe and spraying it onto the filter cloth from the nozzle.

At this time, by rotating the cleaning liquid supply pipe, the nozzle orientation changes, and the direction in which the cleaning liquid is sprayed onto the filter cloth can be changed. For example, by spraying the cleaning liquid vertically 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.

Patent Publication No. 2022-102233

However, in the conventional system 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 a foreign object on the surface of the filter cloth, the foreign object may become embedded in the filter cloth and not be removed, or the filter cloth may be damaged.

In addition, 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 any foreign matter present on the surface of the filter cloth, causing the foreign matter to be blown away and removed; however, the strength with which the cleaning liquid collides with the filter cloth will be reduced, which may result in a reduced cleaning effect.

The present invention aims to provide a solid-liquid separation device and a method for cleaning the 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.

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 transporting 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 jet nozzle that jets the cleaning liquid perpendicularly toward the endless belt, and a second jet nozzle that jets the 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, with respect to the direction in which the cleaning liquid is sprayed from the first spray nozzle.

According to this, the material to be treated that is supplied onto the endless belt is separated into solid and liquid while being transported by the endless belt, and is then discharged from the endless belt. In addition, the endless belt is cleaned by spraying cleaning liquid from the first and second spray nozzles toward the endless belt.

In this case, by spraying the cleaning liquid vertically from the first spray nozzle toward the endless belt, the strength with which the cleaning liquid collides with the endless belt is increased, improving the cleaning effect.

In addition, in the second spray area, which is located upstream of the first spray area, foreign matter on the endless belt is blown away and removed by the cleaning liquid sprayed from the second spray nozzle at an angle toward the endless belt. As a result, immediately after the foreign matter on the endless belt is removed, the cleaning liquid is sprayed vertically from the first spray nozzle toward the endless belt, preventing the foreign matter from becoming embedded in the endless belt. As 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.

In the solid-liquid separation device of 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.

By spraying the cleaning liquid from the second spray nozzle onto the endless belt, foreign matter on the endless belt is blown across the width of the endless belt relative to the direction of travel of the endless belt. This makes it possible to remove foreign matter on the endless belt upstream of the first spray area in the opposite direction to the direction of travel of the endless belt.

In the solid-liquid separation device of the third invention, the cleaning device can move in the width direction of the endless belt.

By moving the cleaning device in the width direction of the endless belt while rotating the endless belt, even wide endless belts can be easily cleaned. In addition, by moving the cleaning device to the side end of the endless belt in the width direction, maintenance and inspection of the cleaning device can be easily performed even on wide endless belts.

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 supplying device that supplies a cleaning liquid to the header is connected to the header.

This allows the first and second injection nozzles to be concentrated in one location, making the cleaning device simple and compact.

In the solid-liquid separation device of the fifth invention, the 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.

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, which prevents the workpiece from interfering with the second spray nozzle when it is transported by the endless belt, and makes it possible to sufficiently blow away foreign objects on the endless belt.

If the spray angle of the second spray nozzle were to be less than 20°, the second spray nozzle would need to be brought closer to the endless belt in order to achieve sufficient foreign matter removal, and there is a risk that the workpiece will interfere with the second spray nozzle when transported by the endless belt.

In addition, if the spray angle of the second spray nozzle were to be greater than 60°, it may be difficult for the cleaning liquid sprayed from the second spray nozzle to sufficiently remove foreign matter from the endless belt.

The sixth invention is a method for cleaning an endless belt in a solid-liquid separation device that separates solid-liquid from a material to be treated while transporting the material with a water-permeable rotatable endless belt, comprising:
A cleaning liquid is sprayed from a first spray nozzle perpendicularly toward the endless belt, and from a 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 positioned 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, with respect to the direction in which the cleaning liquid is sprayed from the first spray nozzle.

By spraying the cleaning liquid perpendicularly from the first spray nozzle toward the endless belt, the strength with which the cleaning liquid collides with the endless belt is increased, improving the cleaning effect.

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

The method for cleaning the endless belt of the solid-liquid separator in the seventh invention involves moving the first and second spray nozzles together in the width direction of the endless belt.

By moving the first and second jet nozzles together in the width direction of the endless belt while rotating the endless belt, even wide endless belts can be easily cleaned. In addition, by moving the first and second jet nozzles together 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 wide endless belts.

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 obtain a sufficient cleaning effect.

1 is a schematic diagram showing a configuration of a belt-type concentrator according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view of a cleaning device for the belt-type concentrating apparatus according to the first embodiment. FIG. 2 is a partially enlarged plan view of the endless belt of the belt-type concentrator of the first embodiment. 4 is a view taken along the line XX in FIG. 3. FIG. 2 is a partially cutaway front view of the cleaning device as viewed from the traveling direction of the endless belt of the belt-type concentrating device in accordance with the first embodiment. 6 is a view taken along the line XX in FIG. 5 . 6 is a view taken along the line YY in FIG. 5. FIG. 2 is a plan view showing first and second spray areas when cleaning water is sprayed onto an endless belt from first and second spray nozzles of a cleaning device of the belt-type concentrating device in accordance with the first embodiment. FIG. 11 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 in a second embodiment of the present invention. FIG. 13 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 in a third embodiment of the present invention.

The following describes an embodiment of the present invention with reference to the drawings.

(First embodiment)
In the first embodiment, as shown in Fig. 1, a belt-type thickening apparatus 1 is an example of a solid-liquid separation apparatus. The belt-type thickening apparatus 1 is used to thicken sludge 2 (an example of a material to be treated) by filtering and dehydrating the sludge 2 in, for example, a sewage treatment plant.

As shown in Figures 1 and 2, the belt-type concentrator 1 has a start end roller 5, a finish end roller 6, a rotatable endless belt 7 wound between the 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.

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

As shown in Figures 3 and 4, the endless belt 7 is a mesh-like, water-permeable belt in which multiple metal wires 51 are arranged in a spiral shape around the axis of the width direction W of the endless belt 7, with different winding directions, in close contact with each other along the length direction L of the endless belt 7, and linear bone wires 52 are inserted through the multiple metal wires 51 that overlap in the length direction L.

The endless belt 7 has many tiny openings 53 that connect the front and back surfaces, and multiple internal gaps 54, and the openings 53 are formed between three adjacent metal wires 51. As a result, each spiral metal wire 51 is connected to each other by a bone wire 52, and the endless belt 7 is flexible in the front and back directions and has elasticity in the length direction L.

A chain (not shown) is attached around the entire circumference of both side edges of the endless belt 7 in the width direction W. In addition, sprockets (not shown) are provided on both ends of the start end roller 5 and both ends of the end 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 end roller 6 is driven to rotate, the rotational force is transmitted to the start end roller 5 via the sprockets and chain, and the start end roller 5 rotates in sync with the end end roller 6, causing the endless belt 7 to rotate.

As shown in FIG. 1, the path along which the endless belt 7 rotates includes a transport path 12 that transports the sludge 2 from the start roller 5 to the end roller 6, and a return path 13 that returns from the end roller 6 to the start roller 5.

Multiple support plates 14 are provided on the frame 20 to support from below the endless belt 7 that moves along the conveying path 12 in the traveling direction A.

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

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

The header 21 is a rectangular box-shaped member having a hollow portion 27, and is supported and guided by a guide member 28, allowing it to move back and forth in the width direction W of the endless belt 7. The guide member 28 is supported by a number of posts 29, and is provided above the endless belt 7 across the width direction W.

A pair of engagement members 30, 31 that engage with the guide member 28 are provided on the top 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.

As shown in FIG. 2, the moving device 10 has a pair of sprockets 33, 34 that face 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 one of the sprockets 33.

The chain 35 is stretched across the endless belt 7 in the width direction W. The header 21 is connected to the chain 35 on the lower path of the chain 35.

A cleaning liquid supply device 38 is connected to the header 21, which supplies cleaning water 8 to the hollow portion 27 in 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.

The first injection nozzles 22, 23, 24, and 25 are nozzles that inject 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, are aligned in a row in the width direction W of the endless belt 7, and have injection holes that communicate with the hollow portion 27 of the header 21.

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

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

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

The second spray area 45 is located upstream of the first spray area 44 in the direction B opposite to the traveling direction A of the endless belt 7. The second spray 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 the 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.

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

As shown in FIG. 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 the direction B opposite to the traveling direction A of the endless belt 7 with respect to the first spray direction 47 in which the cleaning liquid 8 is sprayed from the first spray nozzles 22 to 25.

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°.

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

The operation of the above configuration is explained below.

As shown in FIG. 1, when sludge 2 is thickened, the end roller 6 is rotated by an electric motor to rotate the endless belt 7 in one direction. By supplying sludge 2 from the supply section 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 discharged from the discharge section 16. This causes the sludge 2 to be thickened.

After that, when cleaning the endless belt 7, the supply of sludge 2 to the endless belt 7 is stopped, and the cleaning method described below is carried out.

As shown in Figure 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 Figures 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 from the first spray nozzles 22, 23, 24, and 25 toward the endless belt 7, and is also sprayed obliquely from the second spray nozzle 26 toward the endless belt 7.

At this time, the second spray area 45 is located upstream of the first spray area 44 in the direction B opposite to the traveling direction A of the endless belt 7.

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 strength with which the cleaning water 8 collides with the endless belt 7 is increased, the cleaning water 8 penetrates the endless belt 7 from the front to the back, the sludge 2 adhering to the endless belt 7 is sufficiently removed, and the cleaning effect on the endless belt 7 is improved.

In addition, if foreign matter (e.g., paper, hair, fibers, food residue, etc.) is present on the endless belt 7, 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 from the second spray nozzle 26 toward the endless belt 7 in the second spray area 45, as shown in FIG. 6, and is removed.

As a result, as shown in FIG. 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, the cleaning water 8 is sprayed vertically from the first spray nozzles 22, 23, 24, and 25 toward the endless belt 7. This prevents foreign matter from becoming embedded in the endless belt 7, and the pressure of the cleaning water 8 sprayed from the first spray nozzles 22, 23, 24, and 25 toward the endless belt 7 can be increased to further improve the cleaning effect.

In this manner, with the 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 revolutions, and then, as shown in FIG. 2, the electric motor 36 of the moving device 10 is driven to rotate the chain 35, and as shown in FIG. 5 and FIG. 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 of the first spray area 44 (see FIG. 8).

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

This allows the endless belt 7 to be easily cleaned over its entire circumference and width, even if it is a wide endless belt 7. In addition, as shown in FIG. 2, by moving the header 21 to one side end 60 (or the opposite other side end) in the width direction W of the endless belt 7, maintenance and inspection of the cleaning device 9 can be easily performed even for a wide endless belt 7.

In addition, since the first injection nozzles 22, 23, 24, 25 and the second injection nozzle 26 are provided in one common header 21, the first injection nozzles 22, 23, 24, 25 and the second injection nozzle 26 can be concentrated in one location, making the cleaning device 9 simple and compact in configuration.

In addition, as shown in FIG. 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°, so that a sufficient distance can be secured 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.

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 it is transported by the endless belt 7.

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

In the first embodiment described above, as shown in FIG. 6, the 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 opposite the one side D (see the dotted line in FIG. 6), 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 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 one side D.

In the first embodiment, as shown in FIG. 5, the header 21 is provided with multiple 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.

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. However, 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.

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.

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.

The first injection area 44 is formed as a long, thin line across the entire width of the endless belt 7.

The second injection areas 45, 81 are located upstream of the first injection area 44 in the direction B opposite to the traveling direction A of the endless belt 7. In a plan view, the second injection areas 45, 81 are formed in elongated linear shapes 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.

This provides the same effects and benefits as the first embodiment.

Third Embodiment
The third embodiment described below is a modification of the second embodiment, in which a plurality of fixed headers 21, 85, 86 are provided above the endless belt 7 as shown in FIG.

These headers 21, 85, and 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, and 88.

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.

The first injection areas 44, 90, and 91 are each formed as elongated lines along the width direction W of the endless belt 7.

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

The second injection areas 45, 81, 92, and 93 are each formed as elongated lines 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.

This provides the same effects and benefits as the first embodiment.

In each of the above embodiments, sludge 2 is given as an example of the material to be treated, but it is not limited to sludge 2.

In each of the above 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°).

In each of the above embodiments, cleaning water 8 is sprayed onto the endless belt 7 as an example of a cleaning liquid, 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.

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.

1. Belt-type concentrator (solid-liquid separator)
2 Sludge (material to be treated)
7 Endless belt 8 Cleaning water (cleaning liquid)
9 Cleaning device 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 Traveling direction of endless belt B Opposite direction C2 Injection angle W Width direction of endless belt

Claims (7)

A solid-liquid separation device that separates a material into solid and liquid while transporting the 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 jet nozzle that jets the cleaning liquid perpendicularly toward the endless belt, and a second jet nozzle that jets the 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 solid-liquid separation device characterized in that a 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, with respect to a direction in which the cleaning liquid is sprayed from the first spray nozzle. The solid-liquid separation device according to claim 1, characterized in that 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. The solid-liquid separation device according to claim 1, characterized in that the cleaning device is movable in the width direction of the endless belt. The first injection nozzle and the second injection nozzle are provided in a common header,
2. The solid-liquid separator according to claim 1, further comprising a cleaning liquid supply device connected to the header for supplying the cleaning liquid to the header. The solid-liquid separation device described in claim 1, characterized in that 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. A method for cleaning an endless belt in a solid-liquid separation device that separates solid-liquid from a material to be treated while transporting the material using a water-permeable, rotatable endless belt, comprising:
A cleaning liquid is sprayed from a first spray nozzle perpendicularly toward the endless belt, and from a 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 positioned 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 separation device, characterized in that a direction in which the cleaning liquid is sprayed from a second spray nozzle is inclined toward an upstream side, in the opposite direction to the traveling direction of the endless belt, with respect to a direction in which the cleaning liquid is sprayed from a first spray nozzle. A method for cleaning an endless belt of a solid-liquid separator as described in claim 6, characterized in that the first spray nozzle and the second spray nozzle are moved integrally in the width direction of the endless belt.

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