JP2005074286A - Sludge dehydrating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sludge dehydrating device capable of realizing a high dehydration effect by sucking, with a water-absorptive cloth, dislocated water which is not dislocated through water discharge by electrolysis or electric osmosis, but through water movement and dislocation in sludge cake caused by electrophoresis. <P>SOLUTION: A plurality of slender parallelopiped electrode rows are rotatably disposed like a caterpillar to pinch sludge cake with water contained therein which is discharged from a sludge treatment device. By applying the direct current to the sludge cake, dislocation by electrophoresis is caused in water contained in the sludge cake, and the water moved to a bottom portion of the sludge cake is sucked through a thick water absorptive cloth laid on the lower side of the cake while the water absorptive cloth is pressed against and brought into contact with upper and lower sides of the cake. The water is squeezed and discharged by a squeezing roll of a dehydrator, and the water absorptive cloth is cleaned by a cleaning device. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a dewatering treatment of various industrial wastewater, that is, sewage sludge, sanitary center (sewage treatment etc.) sludge, fishery processing industry sludge, meat processing industry sludge, food and beverage industry sludge, chemical industry sludge, livestock sludge, industrial waste sludge, etc. Regarding the equipment, in particular, filtration that prevents the water absorbent cloth used when dewatering sludge water with the sludge treatment equipment from stretching and is equipped with a protective net to prevent the water absorbent cloth from fluffing, and further installs the water absorbent cloth. The present invention relates to a water-absorbing cloth having a structure in which a plurality of filter bodies move alternately so as not to cause clogging of the dewatering mechanism, and a sludge dewatering device including the filter dewatering mechanism.

  Various dewatering methods have been developed as devices for dewatering sludge, and each device finally drains the sludge cake from which moisture has been dehydrated from the outlet, and the sludge cake is transported by an appropriate transport means. ing. Lowering the moisture content of the discharged sludge cake is related to the weight and volume of the transport, so technologies for lowering the moisture content as much as possible have been researched and developed.

  As a method for reducing the moisture content, a physical method of applying dehydration to a dehydrated sludge cake by further applying strong pressure and a method of dehydrating by an electric method such as electrolysis or electroosmosis are used. In the strong pressure dehydration method, in order to lower the moisture content, it is devised to increase the dewatering efficiency by increasing the pressure sandwiching the sludge cake. However, in actual measurement, there is a drawback that the moisture content does not decrease effectively even if the pressure is increased. In addition, it is known that if the sludge cake is swollen, dehydration further proceeds, but if a special force is applied to the dewatered cloth with the sludge cake sandwiched, the dewatered cloth may be damaged. In addition, the dewatering cloth itself was clogged, and it was difficult to perform efficient dehydration experimentally. In addition, once the clogged dehydration cloth is clogged, it cannot be easily removed even if it is washed in the subsequent process.

  As a general dehydration method, there is a method in which moisture is absorbed by a capillary phenomenon by adhering a water absorbent cloth to a sludge cake. This method has an advantage of being excellent in cost because it does not use a large amount of electricity like electrolysis. The water-absorbing cloth containing water is pressed and squeezed out with a squeeze roll or the like, and pressed against the sludge cake again to absorb the water. However, the water absorbent cloth has a disadvantage that it loosens and stretches as it is used. Since the water absorbent cloth once slackened cannot be regenerated and the water absorption effect is lowered, the water absorbent cloth must be replaced.

  Moreover, since the adhering substance adheres to the surface, it is necessary to remove the surface dirt with a rotating brush etc. for the water absorption cloth which presses a sludge cake and absorbs a water | moisture content. However, if the adhered matter is removed using a rotating brush, mud or the like infiltrates into the absorbent fabric, making it difficult to clean the absorbent fabric, and further, there is a problem that the surface of the absorbent fabric becomes fluffy due to the rotating brush. When the surface becomes fluffy, when it is brought into contact with the sludge cake to absorb moisture, mud easily enters the water absorbent cloth, resulting in a problem that the water absorption rate is lowered.

A sludge dewatering device has also been developed that is equipped with a water absorbent cloth and that has sludge mounted on a plurality of filter element rows to discharge the moisture of the sludge from the gaps between the filter elements. In this apparatus, moisture is absorbed by the water absorbent cloth, and a filter body is disposed below the water absorbent cloth, and water is drained from a gap formed between the filter body and the filter body. The combination of the water absorbent cloth and the filter dewatering with the filter body has an effect of effectively draining water from the sludge. However, when sludge adheres between a plurality of filter media, the mud closes the gap, causing clogging and reducing the water draining effect.
Even if a water absorbing cloth having a high water absorption effect and a dewatering mechanism having a plurality of filter bodies are used in combination, there are problems as described above, and there is a problem that efficient drainage cannot be realized. Development of a dehydrator was awaited.
JP-A-1-49898 JP 11-165196 A

  The present invention is an apparatus for solving the above-described problems, and an object of the present invention is to provide a sludge dewatering apparatus having a high water absorption efficiency in which a water absorbent cloth does not stretch and sag and a filter body is not clogged.

  In order to achieve the above object, a sludge dewatering apparatus according to the present invention is a sludge dewatering apparatus that absorbs moisture by pressing a water absorbent cloth against a sludge cake, and is made of a non-extendable material provided with locking projections. The stretch prevention band is attached to the back side of the water-absorbing cloth by being engaged with a locking projection. The stretch prevention band is composed of a hook-and-loop fastener and is provided with a through hole or a slit for passing water. The stretch prevention band is formed to be the same as the width of the water absorbent cloth and is attached to the entire back surface of the water absorbent cloth, or is formed in an elongated band and attached to the back surface of the water absorbent cloth at intervals. It is a configuration.

In addition, the sludge cake is a sludge dewatering device that contacts the sludge cake with a water absorbent cloth to absorb moisture from the sludge, presses and dehydrates the water absorbent cloth, and cleans it with a rotating brush. It is also the structure which equipped the rotating brush inside the protective net so that the surface of a water absorption cloth may not become fluffy by rotation of a rotating brush. The protective net is also configured by a cylindrical or arc-shaped long plate.
Furthermore, it is a sludge dewatering device equipped with a stretch prevention band, equipped with a rotating brush that cleans the water absorbent cloth after it has been separated from the cake, and a protective net that prevents the surface of the water absorbent cloth from becoming fuzzy by the rotation of the rotating brush. It is also a configuration equipped with.

  Furthermore, the sludge dewatering device is equipped with a water absorbing cloth that presses and contacts the sludge cake to absorb moisture and a filter dewatering mechanism in which a plurality of filter bodies are aligned, the filter dewatering mechanism comprising the filter body and the filter. A filter shaft for joining the body to the bearing block and the cam follower, a bearing block, a chain equipped with a chain attachment for installing the bearing block, a roller for driving the chain for moving the filter shaft in the advancing direction, A plurality of cams installed on the lower part of the water-absorbing cloth so that sludge stays between adjacent filter bodies and does not cause clogging. The cam followers that are installed on the filter shafts so that the adjacent filter bodies move irregularly by shifting the shafts of the filter bodies from the adjacent filter shafts randomly along the shape of the plate cam. It is configured to move.

In addition, these sludge dewatering devices are also equipped with a stretch prevention band on the back side of the water absorbent cloth, and further equipped with a protective net on the outer peripheral surface of the rotating brush so that the water absorbent cloth is not fuzzy. It is also possible.
Furthermore, the sludge dewatering device is fitted with a stretch prevention band made of a non-extending material with a locking projection protruding from the water absorbent cloth, which is inserted from the back side of the water absorbent cloth with the locking projection, It is also possible to adopt a configuration in which a protective net is provided on the outer peripheral surface of the rotating brush so as not to fuzz.

Since the sludge dewatering apparatus according to the present invention has the configuration as described in detail above, it has the following effects.
1. By attaching an elongation preventing band made of a non-extendable material equipped with a locking projection on the water absorbent cloth of the sludge dewatering device from the back side of the water absorbent cloth, it is possible to prevent the water absorbent cloth from stretching and slackening due to long-term use.
2. The use of hook-and-loop fasteners makes it easy to obtain materials and can be made at low cost.
3. Since a through hole or slit for passing water is provided in the stretch prevention band, drainage efficiency is good.
4). Since the stretch prevention band is attached to the entire width of the water absorbent cloth, it can be reliably prevented from stretching.

5). Since the protective net is provided, even if the water absorbent cloth is washed, the surface does not become fluffy, so the water absorption efficiency does not decrease.
6). Work efficiency is good because the rotating brush is covered with a cylindrical or arc-shaped protective net.
7). More efficient dewatering is possible by installing a rotating brush that cleans the water absorbent cloth and a protective net on a sludge dewatering device equipped with a stretch prevention band.
8). Furthermore, sludge stays on the filter body and does not cause clogging by adding a mechanism that shifts the filter shaft that the adjacent filter bodies move alternately to the filter dehydrator that combines the water absorbent cloth and filter body. .
9. It is also possible to equip a filter dehydrator that combines a water absorbent cloth and a randomly operating filter body with an elongation preventing band.
10. It is also possible to equip the rotating brush with a protective net.
11. Further, it is possible to adopt a configuration in which an extension preventing belt is attached to the water absorbent cloth and a protective net is provided to the rotating brush.

Hereinafter, a sludge dewatering apparatus according to the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a configuration diagram of a sludge dewatering device according to the present invention equipped with an elongation preventing band and a protective net, FIG. 2 (a) a side view of a water absorbent cloth equipped with the elongation preventing band, and (b) an elongation with a perforated hole. It is a block diagram of a prevention band, (c) It is a block diagram of the elongation prevention band which pierced the hole and provided the slit. 3A is a perspective view in which a cylindrical protection net is provided on a rotating brush, FIG. 3B is a perspective view in which an arc-shaped protection net is provided on the rotating brush, and FIG. 4 is a filtration dehydration using a plurality of filter bodies. It is a structure perspective view of a mechanism. 5A is a plan view of the filtration and dewatering mechanism, FIG. 5B is a side view of the filtration and dewatering mechanism, and FIG. 6B is a right side view of the filtration and dewatering mechanism, and FIG. FIG. 7 is an operation diagram of the filtration and dehydration mechanism.
The sludge dewatering device 10 includes a water absorbent cloth 20, an elongation preventing band 30, a rotating brush 40, a driving roll 50, a driven roll 60, a squeezing roll 70, and a scraper 80. It is also possible to employ a configuration in which the protective brush 90 is provided on the rotating brush.

  The configuration of the sludge dewatering device of the present invention will be described in detail with reference to FIG. 1. The sludge dewatering device 10 is configured to suck moisture with an upper dewatering device 12 and a lower dewatering device 13 sandwiching a sludge cake. The water absorbent cloth 20 is a cloth for bringing the water contained in the cake into contact with the sludge cake to absorb water by capillary action. In this embodiment, a nonwoven fabric made of a band having a constant width is used, and a loop (ring) is used. It is formed in a shape. The sucked water is basically configured to fall as a liquid from the lower part of the water absorbent cloth by its own weight. Further, the remaining water is also configured to be squeezed out by the squeezing roll 70 as the water absorbent cloth rotates. However, the water absorbent cloth tends to be stretched and slackened by being pulled by a driving roll 50, a driven roll 60, and a squeezing roll 70, which will be described later.

  As the stretch prevention band 30, a material having protrusions protruding from a non-stretchable material is used. In this embodiment, a hook-and-loop fastener is used. By attaching the stretch preventing band 30 to the bottom of the water absorbent cloth 20 with protrusions and attaching the water absorbent cloth 20 from below, it is possible to prevent the water absorbent cloth 20 and the stretch preventive band 30 from being integrally stretched and loosened. It is out. In addition, since the projection is provided on the hook-and-loop fastener and the hook-and-loop fastener itself is not stretchable, it is convenient to use the hook-and-loop fastener, but any other non-stretchable material can be used. Further, the stretch prevention band 30 is provided with a hole 34 or a slit hole (not shown) as shown in FIG. 2 so that the water drips from the water absorbent cloth saturated by absorbing the water. Moreover, although the stretch prevention belt | band | zone 30 is a structure attached over the back side full length of the water absorption cloth 20, it can also be attached to a longitudinally longitudinal belt shape, and can also form a slit. When mounting in a strip shape, it is necessary to mount the stretch prevention band 30 so as to be parallel to the longitudinal direction of the water absorbent cloth.

  The rotating brush 40 is a cleaning brush for removing sludge adhering to the surface of the water absorbent cloth 20, and the surface of the water absorbent cloth 20 is brought into contact with the rotating brush and rubbed to remove the sludge. The rotating brush 40 is configured to rotate about a central axis, and can efficiently remove sludge because the surface of the water absorbent cloth 20 is rubbed while rotating.

The drive roll 50 is a columnar or cylindrical drive unit for smoothly operating the water absorbent cloth 20, and rotates the water absorbent cloth 20 in contact with the surface by rotating.
The driven roll 60 is installed at the other end when the drive roll 50 is disposed at one end. The drive roll 50 and the driven roll 60 are installed as a set, and one set is arranged on each of the upper and lower portions of the dehydrator as shown in FIG. The drive roll 50 is connected to a drive source such as a motor or an engine, but the driven roll 60 has no drive source and is installed to guide the water absorbent cloth 20.

  The squeezing roll 70 is a roll for squeezing moisture from the water-absorbing cloth 20 containing moisture. In this embodiment, three squeezing rolls are installed at the upper part of the dehydrator and two at the lower part of the dehydrator. As shown in FIG. 1, two places are installed on the back side of the water absorbent cloth and one place on the surface of the upper part of the dehydrating apparatus, and they are alternately arranged. Further, at the lower part of the dehydrator, one is arranged on the back side and one on the surface. This is because the water-absorbing cloth 20 is compressed by arranging it alternately on the front side and the back side, and the efficiency of squeezing out moisture is good.

  The scraper 80 is a blade that is installed to remove sludge on the surface that could not be removed by the rotating brush 40. Although the rotary brush 40 scrapes off the surface of the water absorbent cloth 20 with a brush, since the hair tip is soft, sludge may remain on the surface. Although it is possible to absorb water from the sludge cake again with the sludge remaining, it is equipped with a device for removing the surface for cleaning because the water absorption effect is reduced.

It is also possible to equip the sludge dewatering device having this configuration with a protective net 90.
The protective net 90 is a net body disposed on the outer peripheral surface of the rotating brush 40, prevents the hair tips of the rotating brush 40 from damaging the surface of the water absorbent cloth, and the surface of the water absorbent cloth 20 after the sludge is removed. Prevents fuzzing. The protective net 90 is not limited to a cylindrical shape as shown in FIG. 3A, and an arc shape as shown in FIG. 3B may be used. Conventionally, since this kind of protective net 90 was not equipped, when the sludge adhering to the surface of the water absorbent cloth 20 was removed by the rotating brush 40, the tip of the brush stuck in the water absorbent cloth and the surface of the water absorbent cloth 20 was removed. It was fluffy. When the water absorbent cloth 20 comes into contact with the sludge cake again and absorbs moisture while the surface is still fuzzy, the sludge enters into the water absorbent cloth, reducing the water absorption effect and making washing after washing difficult. In order to solve this problem, the protection net 90 is equipped, and it is possible to equip the sludge dewatering apparatus not equipped with the stretch prevention band.

  The operation of the sludge dewatering apparatus of the present invention will be described in detail with reference to FIG. In FIG. 1, the space between the upper dewatering device 12 and the lower dewatering device 13 is wide, but this is for clearly explaining the configuration, and the actual space is smaller than the space in FIG. . The water absorbent cloth 20 is moved in the A direction by the drive roll 50. The sludge cake is mounted and supplied on the water absorbent cloth 20 of the dehydrator sequentially from the upper left of the figure. The water absorbent cloth 20 equipped in the upper dewatering device 12 and the lower dewatering device 13 comes into contact with the sludge cake so as to be sandwiched from above and below. The moisture of the sludge cake is sucked into the water absorbent cloth by capillary action. Water is absorbed by the absorbent cloth 20 by capillary action, and the sludge cake is discharged toward the right end of the figure. The water sucked into the water absorbent cloth 20 is configured to be dropped and discharged from the hole 34 formed in the stretch prevention band 30 on the back surface of the water absorbent cloth 20 by its own weight.

  The water absorbent cloth 20 that has absorbed water is rotated by the drive roll 50, and first, the sludge attached to the surface is separated and separated by the scraper 80. Next, the sludge on the surface is scraped off by the rotating brush 40. In the present invention, since the rotating brush is equipped with the protective net 90, the water absorbent cloth 20 does not fluff, and there is no concern that the sludge enters the water absorbent cloth 20 when moisture is absorbed from the sludge cake again. Next, the upper dewatering device and the lower dewatering device squeeze the water absorbed in the water absorbent cloth 20 by the respective squeezing rolls 70, rotate again to the left in the figure where the sludge is supplied, and again take the moisture from the sludge cake. It is the structure which repeats.

The sludge dewatering device 10 of the present invention can be equipped with a filtration and dewatering mechanism 100 as shown in FIG. 4 in the lower dewatering device.
The filtration dewatering mechanism 100 includes a filter body 110, a filter body shaft 120, a bearing block 130, a chain roller 140, a chain 150, a plate cam 160, a cam follower 162, and a drive roll 170.

  The filter body 110 is an elongated rectangular body as shown in FIG. 4, and has a configuration in which a cylindrical joint 112 for joining to the filter body shaft 120 is provided. Moreover, the filter body 110 is formed in a wide band shape by arranging a plurality of the filter bodies 110 in parallel with a slight gap. Further, in this embodiment, adjacent filter bodies 110 are not joined to the same filter body shaft 120, but every other filter body 110 is joined to another filter body shaft 120a. As a result, the adjacent filter bodies move up and down in response to different axes, resulting in a random movement, and the sludge is constantly shaken and moved, so that it does not stagnate at one place and cause clogging.

  The filter body shafts 120 and 120 a are shafts that are joined to the joint portion 112 of the filter body 110, both ends are joined to the bearing block 130, and the extension portion at one end is joined to the cam follower 162. The filter shaft 120 is configured to move as the bearing block 130 moves.

  The bearing block 130 is a member that fits with the filter body shaft 120, and is installed on the chain 150. The bearing block 130 is a support member for supporting the filter body shaft 120 and is rotatably engaged.

  The chain roller 140 is a cylindrical roller that engages with the chain 150 and has a smooth surface in order to operate smoothly. Further, the center shaft is engaged with the chain 150.

  The chain 150 is a conductive member that transmits the rotation of the roller to the filter body to rotate the filter body row, and the bearing block 130 is installed, and the chain roller 140 is sandwiched and engaged from the left and right. The chain 150 is engaged with the drive roll 170 and is rotated by the operation of the drive roll 170.

The plate cam 160 is an uneven rectangular parallelepiped plate having a continuous mountain shape, and the cam follower 162 slides along its end surface. In this embodiment, the unevenness of the plate cam 160 is a smooth, substantially triangular shape, and the cam follower 162 swings up and down as the cam follower 162 passes over the plate cam.
As shown in FIG. 4, the cam follower 162 includes a cylindrical joint portion 164 and a columnar contact portion 166. The joint portion 164 is firmly joined to the filter body shafts 120 and 120a, and the contact portion 166 is configured to slide in contact with the end surface of the plate cam 160.

  The drive roll 170 is a rotating body that drives the filter body, and as shown in FIG. 6, the chain 150 engaged with the roll is rotated to transmit the rotational motion to the filter body. A drive source such as an engine or a motor is connected to the drive roll 170. The driving roll 170 rotates to rotate the filter body 110 and the filter body shafts 120 and 120a engaged with the chain 150.

  As shown in FIG. 6, the filtration dehydration mechanism 100 has a configuration in which the chain 150 is rotationally driven by a drive roll 170 and the entire filter body row is rotated. As shown in FIG. 5, a bearing block 130 is installed in the chain 150, and filter shafts 120 and 120a are fitted into the bearing block as shown in FIG. A joint 112 of an elongated rectangular parallelepiped filter body 110 is connected to the filter body shafts 120 and 120a, and a cam follower 162 is provided at one end in the longitudinal direction of the filter body shaft. As shown in FIG. 4, adjacent filter bodies are joined to the filter body shaft 120 a arranged one or two before and after without being joined by the same filter body shaft 120. The chain 150 is moved as a whole in the direction of movement by the chain 150, but the filter shafts 120 and 120a that are joined by the cam follower 162 swinging up and down due to the unevenness of the plate cam 160 also move up and down. Due to the movement of the filter body shafts 120 and 120a, the joined filter body 110 also swings up and down. As a result, the adjacent filter bodies 110 are joined to the different filter body shafts 120 and 120a, so that they move separately and move up and down randomly.

The operation of the filter body 110 will be described in more detail with reference to FIG. 7. Since the first filter body 200 and the second filter body 210 are adjacent filter bodies, they are joined to different filter shafts. The first filter body 200 is in the low position and the second filter body 210 is in the high position as shown in FIG. 7B, the first filter body 200 is at a high position and the second filter body 210 is at a low position, as shown in FIG. 7B. It operates so as to alternate with the state of (b).
Due to this operation, the filter bodies were evenly arranged in the conventional filtration and dehydration device, and sludge particles and the like entered the gaps and caused clogging. Therefore, sludge particles and the like are always moved, and clogging can be prevented. In addition, since the adjacent filter bodies may be configured to perform different operations, the filter bodies may be respectively installed on three or a plurality of filter body shafts.

  This filtration dewatering mechanism 100 can be installed in any conventional sludge dewatering device, and of course, can also be installed in a sludge dewatering device having another structure that absorbs moisture from the sludge cake with a water absorbent cloth. . In this embodiment, a plate cam and a cam follower are used. However, a rack (tooth) & pinion (gear) system may be used, and other methods may be used.

  The sludge dewatering apparatus according to the present invention can use a water absorbent cloth that has been conventionally extended and slackened to reduce the water absorption effect and must be replaced by using a water absorbent cloth equipped with an elongation preventing belt. It was. Moreover, since the rotating brush is equipped with a protective net so that the surface of the water absorbent cloth is not fluffed, there is no need to worry about sludge entering the water absorbent cloth. Furthermore, since the movement of the filter bodies adjacent to each other in the filtration dewatering mechanism is made random, it is possible to prevent clogging with sludge particles and the like, and it is possible to efficiently filter water.

Configuration diagram of sludge dewatering device according to the present invention equipped with an elongation preventing band and a protective net (A) Side view of a water absorbent cloth equipped with an elongation preventing band (b) Configuration diagram of the elongation preventing band with holes drilled (c) Configuration diagram of the elongation preventing band with holes drilled and further provided with slits (A) Perspective view when a rotating brush is equipped with a cylindrical protective net (b) Perspective view when an arc-shaped protective net is installed on a rotating brush Perspective view showing the configuration of the filtration dehydration mechanism (A) Top view of the filtration dewatering mechanism (b) Side view of the filtration dewatering mechanism (c) Right side view of the filtration dewatering mechanism Side view of filtration and dewatering mechanism installed in sludge dewatering equipment Operation diagram of filtration dewatering mechanism

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sludge cake 10 Sludge dewatering device 12 Upper dewatering device 13 Lower dewatering device 20 Water absorption cloth 30 Stretch prevention belt 34 Hole 40 Rotating brush 50 Drive roll 60 Follower roll 70 Squeezing roll 80 Scraper 90 Protection net 100 Filtration dehydration mechanism 110 Filter body 112 Joining Portions 120 and 120a Filter shaft 130 Bearing block 140 Chain roller 150 Chain 160 Plate cam 162 Cam follower 164 Joining portion 166 Abutting portion 170 Drive roll 200 First filter body 210 Second filter body

Claims (11)

  In the sludge dewatering device that absorbs moisture by pressing the water absorbent cloth against the sludge cake, a stretch prevention band made of a non-extending material with a locking projection protruding from the back side of the water absorbent cloth is engaged with the locking protrusion. Sludge dewatering device characterized by wearing   2. The sludge dewatering device according to claim 1, wherein the stretch prevention band comprises a surface fastener.   The sludge dewatering apparatus according to claim 1 or 2, wherein the stretch prevention band is provided with a through hole or a slit for passing water.   The stretch prevention band is formed to be the same as the width of the water absorbent cloth and is attached to the entire back surface of the water absorbent cloth, or is formed of an elongated band and is attached to the back surface of the water absorbent cloth with a gap therebetween. The sludge dewatering device according to any one of claims 1 to 3   Rotating the rotating brush that removes dirt from the dehydrated absorbent cloth in the sludge dewatering device that presses the absorbent cloth against the sludge cake to absorb moisture from the sludge, dehydrates the absorbent cloth and cleans it with a rotating brush. The sludge dewatering device is equipped with a rotating brush inside the protective net so that the surface of the water absorbent cloth does not become fuzzy   6. The sludge dewatering device according to claim 5, wherein the protective net comprises a long plate having a cylindrical shape or an arc shape.   The sludge dewatering apparatus equipped with the stretch prevention band according to claim 1 is equipped with a rotating brush for cleaning the water absorbent cloth after being separated from the cake, and the surface of the water absorbent cloth is not fuzzed by the rotation of the rotary brush. The sludge dewatering device according to claim 1, further comprising a protective net. In the sludge dewatering equipment equipped with a water absorption cloth that presses and contacts the sludge cake to absorb moisture and a filtration dewatering mechanism in which a plurality of filter bodies are aligned,
The filtration dewatering mechanism includes a filter body, a filter body shaft that joins the filter body to the bearing block and the cam follower, a bearing block, a chain equipped with a chain attachment for installing the bearing block, and a direction in which the filter body shaft moves. It consists of a roller for driving the chain to move to, a plate cam with unevenness, and a cam follower that joins the filter body shaft,
To prevent sludge from accumulating between adjacent filter bodies and causing clogging, shift the axes of the multiple filter bodies installed at the bottom of the water absorbent cloth to be adjacent to the adjacent filter body axes. The sludge dewatering device is characterized in that the cam follower joined to the filter shaft moves randomly up and down along the shape of the plate cam so that the filter body to be operated irregularly   The sludge dewatering device according to claim 1, wherein the sludge dewatering device is provided with a stretch prevention band on the back side of the water absorbent cloth.   9. The sludge dewatering device according to claim 1, wherein the sludge dewatering device is provided with a protective net on the outer peripheral surface of the rotating brush so that the water absorbent cloth does not fluff.   The sludge dewatering device is fitted with a stretch prevention band made of a non-extendable material with a locking projection protruding from the water absorbent cloth, which is inserted from the back side of the water absorbent cloth with the locking protrusion, and further rotated so that the water absorbent cloth does not become fuzzy. 9. A sludge dewatering apparatus according to claim 1, wherein a protective net is provided on the outer peripheral surface of the brush.

Images