JP6988282B2 - Solid-liquid separator - Google Patents

Description

The present invention relates to a solid-liquid separation device, and more particularly to a solid-liquid separation device including a laminated rotary filter body.

Conventionally, a solid-liquid separation device including a laminated rotary filter body is known (see, for example, Patent Document 1).

In Patent Document 1, a rotary shaft, a rotary filter body (stacked rotary filter body) including a plurality of disks laminated along the rotary shaft, a motor for rotationally driving the rotary shaft, and torque of the rotary shaft are described. A sludge dehydration treatment device (solid-liquid separation device) including a torque detecting means for detecting a value and a rotation control means for controlling the rotation speed of a rotary filter body is disclosed. In the sludge dehydration treatment apparatus of Patent Document 1, the rotation control means controls to reduce the rotation speed of the rotary filter in order to achieve smooth sludge treatment work when the torque value exceeds the torque upper limit value. It is configured in.

Japanese Unexamined Patent Publication No. 2002-035798

However, in the sludge dehydration treatment device (solid-liquid separation device) of Patent Document 1, when the torque value (load degree of the laminated rotary filter) exceeds the torque upper limit value (load degree upper limit value), the rotary filter body is used. Since the rotation speed is reduced, there is an inconvenience that the discharge of the solid component of the sludge that has been dehydrated is delayed. Further, when the torque value for rotating the rotary filter exceeds the torque upper limit value, the transport resistance of the solid component of the sludge becomes large, and there is a disadvantage that the sludge is easily clogged. Therefore, when the load degree of the laminated rotary filter is large, there is a problem that the time required for the solid-liquid separation process becomes long and the solid component of the sludge easily clogs.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is the time required for the solid-liquid separation process even when the load degree of the laminated rotary filter is large. Provided is a solid-liquid separation device capable of suppressing clogging due to a solid component of an object to be treated while suppressing the lengthening, and continuously discharging the solid component of the object to be treated having a low water content. That is.

In order to achieve the above object, the solid-liquid separator in one aspect of the present invention includes a rotating shaft and a plurality of strips laminated along the rotating shaft, and a filtration groove is formed between the strips. A stacked rotating filter, a motor that rotationally drives the rotating shaft, a load detection unit that detects the degree of drive load of the stacked rotating filter by the motor, and a control unit that controls the number of rotations of the stacked rotating filter. When the degree of drive load detected by the load detection unit is equal to or higher than the first threshold value, which is the reference value at which clogging occurs due to the solid component of the object to be processed , the control unit increases the number of rotations of the stacked rotary filter body. It is configured to control the rotation.

In the solid-liquid separation device according to one aspect of the present invention, as described above, when the load degree detected by the load detection unit is equal to or higher than the first threshold value, control is performed to increase the rotation speed of the laminated rotary filter body. A control unit is provided. As a result, the transport resistance increases as the solid-liquid separation process progresses, and when the load degree increases, the rotation speed of the laminated rotary filter can be increased, so that the laminated rotary filter is blocked. The solid component of the object to be treated can be quickly discharged before it happens. Further, if the first threshold value is set to a load degree at which there is a high possibility that clogging will occur due to the solid component of the object to be processed if the treatment proceeds as it is, the solid component when the load degree is equal to or higher than the first threshold value. Is discharged, so that clogging due to the solid component of the object to be treated can be suppressed. As a result, even when the load degree of the laminated rotary filter is large, it is possible to suppress the time required for the solid-liquid separation process from becoming long, and to suppress the blockage due to the solid component of the object to be treated, and also to reduce the load. The solid component of the object to be treated with water content can be continuously discharged.

In the solid-liquid separation device according to the above one aspect, preferably, a plurality of stacked rotary filters are arranged in two rows above and below toward the solid discharge port so as to send the solid component of the supplied undiluted solution to the solid discharge port. In addition, the first laminated rotary filter body arranged at the end on the solid discharge port side and the second laminated rotary filter body arranged at the end on the stock solution supply port side to which the undiluted solution is supplied are included. During the normal operation of solid-liquid separation, the control unit rotates the first laminated rotary filter body at a rotation speed smaller than that of the second laminated rotary filter medium, and the control unit rotates the first laminated rotary filter body at a rotation speed smaller than that of the second laminated rotary filter body, and the first laminated rotary filter is detected by the load detection unit. When the degree of drive load of the rotating filter is equal to or higher than the first threshold value, the rotation speed of the first stacked rotating filter is controlled to be higher than that during normal operation. With this configuration, during normal operation of solid-liquid separation, the water content of the object to be treated can be filtered by the second laminated rotary filter medium, and the water content is filtered by the first laminated rotary filter medium. The processed material can be squeezed and dehydrated. Further, when the degree of drive load is equal to or higher than the first threshold value, the number of rotations of the first laminated rotary filter body is increased as compared with that during normal operation, so that the sufficiently dehydrated object to be processed is quickly discharged. At the same time, it is possible to effectively suppress clogging due to the solid component of the dehydrated object to be treated.

In this case, preferably, when the drive load degree of the first stacked rotary filter body detected by the load detection unit is equal to or higher than the first threshold value, the control unit sets the rotation speed of the first stacked rotary filter body to the second. It is configured to perform control so as to be substantially equal to the rotation speed of the laminated rotating filter body. With this configuration, the number of rotations of the first stacked rotating filter can be increased to the same level as the number of rotations of the second stacked rotating filter. The difference between the amount of the object to be processed sent to the laminated rotary filter and the amount of the object to be processed discharged from the first laminated rotary filter can be reduced. As a result, it is possible to prevent the solid component of the object to be treated from being further compressed (dehydrated) in the first laminated rotary filter, and thus it is possible to effectively suppress the blockage due to the solid component of the object to be treated. be able to.

In the configuration in which the laminated rotary filter includes the first laminated rotary filter and the second laminated rotary filter, preferably, a plurality of first laminated rotary filters are provided, and the load detection unit is provided. , Each of the plurality of first laminated rotary filters is provided, and the control unit is a drive load degree of at least one of the drive load degrees of the plurality of first laminated rotary filters detected by the load detection unit. When is equal to or higher than the first threshold value, it is configured to control to increase the rotation speed of all the first stacked rotary filters. With this configuration, even when the load is concentrated on a part of the first laminated rotating filters, the solid component of the object to be treated can be obtained by increasing the rotation speed of all the first laminated rotating filters. Since it can be discharged quickly, the load applied to the first laminated rotary filter body can be quickly reduced.

In this case, preferably, the control unit has a drive load degree of at least one of the drive load degrees of the plurality of first stacked rotary filters to be equal to or higher than the first threshold value, and the control unit has all the first stacked rotary filters. When the number of rotations is increased, the number of rotations of the first laminated rotating filter is increased when all the drive load degrees of the plurality of first stacked rotating filters detected by the load detection unit are less than the first threshold value. It is configured to perform undo control. With this configuration, it is possible to prevent the rotation speed of the first stacked rotating filter from returning to the original value even though the drive load of some of the first stacked rotating filters is large. can.

In the solid-liquid separation device according to the above one aspect, preferably, when the drive load degree becomes equal to or higher than the first threshold value and the rotation speed of the stacked rotating filter is increased, the load is detected after a predetermined time has elapsed. When the degree of drive load detected by the unit is less than the first threshold value, the control is configured to restore the rotation speed of the stacked rotating filter. With such a configuration, it is possible to suppress the continuation of the operation in a state where the rotation speed of the laminated rotary filter is increased, so that the object to be processed is discharged in a state of insufficient dehydration. It can be suppressed.

In the solid-liquid separation device according to the above one aspect, preferably, when the drive load degree detected by the load detection unit is equal to or higher than the second threshold value larger than the first threshold value, the control unit is a laminated rotary filter body. It is configured to control the rotation to stop. With this configuration, the degree of drive load becomes even larger than the first threshold value, and when the second threshold value or higher is reached, the rotation of the stacked rotary filter can be stopped, so that the drive load can be stopped. It is possible to suppress the deformation of the rotating shaft and each strip due to the continuation of the operation in a state where the degree is further increased.

In the solid-liquid separation device according to the above one aspect, preferably, when the drive load degree detected by the load detection unit is equal to or higher than the first threshold value, the control unit increases the rotation speed of the stacked rotary filter body and increases the rotation speed. It is configured to control to reduce the supply amount of the undiluted solution. With this configuration, the amount of the object to be processed that flows into the laminated rotary filter can be reduced, and the amount of the object to be processed that is discharged from the laminated rotary filter can be increased. The amount of the object to be treated accumulated in the laminated rotary filter can be reduced. As a result, the transport resistance can be effectively reduced, so that the drive load degree can be effectively reduced.

In the solid-liquid separation device according to the above one aspect, preferably, the filter piece includes a large-diameter disk piece, a small-diameter disk piece, and a medium-diameter disk piece, and is adjacent to the medium-diameter disk filter. A large-diameter disk filter piece or a small-diameter disk frame piece is swingably arranged between the pieces, and the medium-diameter disk frame piece forms a filtration groove between adjacent medium-diameter disk pieces. Therefore, it has a convex portion that abuts on the adjacent medium-diameter disk strip, and the large-diameter disk strip is arranged so as to enter the filtration groove of the adjacent laminated rotary filter in the direction of sending the solid component. The medium-diameter disk strip is made of resin. With this configuration, it is possible to prevent the filtration groove from being clogged due to the swinging of the large-diameter disk filter piece and the small-diameter disk filter piece. Further, the weight of the laminated rotary filter body can be reduced as compared with the case where the medium-diameter disk strip is formed of metal. As a result, even when the number of stacked strips is increased to increase the size, it is possible to suppress an increase in the load applied to the rotating shaft. Then, in the solid-liquid separation device capable of suppressing an increase in the load applied to the rotating shaft by combining such a structure of the filter piece and the configuration of the solid-liquid separation device according to the above-mentioned one aspect. While suppressing the lengthening of the time required for the solid-liquid separation treatment, it is possible to suppress clogging due to the solid component of the object to be treated.

In the solid-liquid separation device according to the above one aspect, the load detection unit is preferably configured to detect the supply power value of the inverter that controls the frequency of the AC power supplied to the motor as the drive load degree. With this configuration, it is possible to detect the degree of drive load using the power supply value detection unit generally provided in the inverter, so it is not necessary to provide a detection unit such as a sensor separately from the inverter. .. This makes it possible to suppress an increase in the number of parts. Further, the degree of drive load can be easily obtained by detecting the power supply value of the inverter.

According to the present invention, as described above, even when the load degree of the laminated rotary filter is large, the solid component of the object to be treated is blocked while suppressing the time required for the solid-liquid separation process from becoming long. It is possible to continuously discharge the solid component of the object to be treated having a low water content.

It is a side sectional view of the solid-liquid separation apparatus by one Embodiment of this invention. It is a side view of the solid-liquid separation apparatus by one Embodiment of this invention. It is a front sectional view of the solid-liquid separation apparatus by one Embodiment of this invention. It is a block diagram which showed the control structure of the solid-liquid separation apparatus by one Embodiment of this invention. It is an enlarged plan view which showed the adjacent state of the laminated rotary filter body of the solid-liquid separation apparatus by one Embodiment of this invention. FIG. 3 is an exploded perspective view showing a medium-diameter disk strip, a small-diameter disk strip, and a large-diameter disk strip of a laminated rotary filter according to an embodiment of the present invention. It is a side view which showed the medium-diameter disk filter piece of the laminated rotary filter | cylinder of the solid-liquid separation apparatus by one Embodiment of this invention. It is a partially enlarged view of the laminated rotary filter body of the solid-liquid separation apparatus by one Embodiment of this invention. It is a flowchart for demonstrating the rotation speed control process by the control part of the solid-liquid separation apparatus by one Embodiment of this invention. It is a flowchart for demonstrating the rotation speed control process by the control part of the solid-liquid separation apparatus by the modification of one Embodiment of this invention.

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

(Structure of solid-liquid separator)
A solid-liquid separation device 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8. As shown in FIGS. 1 and 2, the solid-liquid separation device 100 according to the embodiment of the present invention includes a processing tank 1, a plurality of motors 2, a plurality of stacked rotary filters 3, and a stock solution supply port 4. , A solid discharge port 5, a liquid discharge port 6, and a water level sensor 7. Further, as shown in FIG. 4, the solid-liquid separation device 100 is provided with a control unit 8 and a power supply 9. Further, as shown in FIG. 1, the solid-liquid separation device 100 is configured so that the undiluted solution is supplied from the undiluted solution supply port 4 provided in the processing tank 1. Further, the solid-liquid separation device 100 is configured to separate the supplied undiluted solution into a solid component and a liquid component (moisture). Further, the solid-liquid separation device 100 is configured to discharge the separated liquid component from the liquid discharge port 6 provided in the lower part of the processing tank 1. Further, the solid-liquid separation device 100 is configured to discharge the separated solid components from the solid discharge port 5 provided on the upper side surface of the treatment tank 1.

A plurality of stacked rotary filters 3 are arranged in two rows above and below toward the solid discharge port 5 so as to send the solid component of the supplied undiluted solution to the solid discharge port 5. Specifically, the laminated rotary filter 3 has eight laminated rotary filters 3a, 3b, 3c, 3d, 3e, 3f, 3g and 3h in the lower row, and the laminated rotary filters 3i and 3j in the upper row. A total of 14 pieces of 6 pieces of 3k, 3l, 3m and 3n are provided. Of the 14 stacked rotary filters, four of the laminated rotary filters 3g, 3h, 3m and 3n are arranged on the solid discharge port 5 side (X2 direction side). Further, of the 14 laminated rotary filters 3, 10 of the laminated rotary filters 3a to 3f and 3i to 3l are arranged on the stock solution supply port 4 side (X1 direction side). In the dehydration treatment, the laminated rotary filters 3g, 3h, 3m and 3n are rotated at a low speed. For example, the laminated rotary filters 3g, 3h, 3m and 3n are rotated at a rotation speed of about 0.25 rpm to 1 rpm. Further, in the dehydration treatment, the laminated rotary filters 3a to 3f and 3i to 3l are rotated at high speed. For example, the stacked rotary filters 3a to 3f and 3i to 3l are rotated at a rotation speed of about 0.75 rpm to 1.5 rpm. The laminated rotary filters 3g, 3h, 3m and 3n are examples of the "first laminated rotary filter" in the claims, and the laminated rotary filters 3a to 3f and 3i to 3l are patented. This is an example of the "second laminated rotating filter body" in the claims.

The vertical (Z direction) distance between the laminated rotary filters 3i to 3n in the upper row and the laminated rotary filters 3c to 3h in the lower row is from the stock solution supply port 4 side to the solid discharge port 5 side. Therefore, it is configured to be narrow. As a result, the volume of the object to be dehydrated is gradually reduced from the stock solution supply port 4 side to the solid discharge port 5 side. In this way, the laminated rotary filters 3a to 3f and 3i to 3l that are rotated at high speed, the laminated rotary filters 3g, 3h, 3m, and 3n that are rotated at low speed, and the solid discharge port from the stock solution supply port 4 side. The upper row of laminated rotary filters 3i to 3n and the lower row of laminated rotary filters 3c to 3h configured to become narrower toward the 5 side, and the flapper 51 and the flapper 51 provided in the solid discharge port 5 described later. The pressure adjusting unit 52 is configured to retain the solid component of the object to be treated toward the solid discharge port 5 side so that the solid component of the object to be treated having a low water content can be discharged. That is, the difference in rotation speed between the stacked rotary filters 3a to 3f and 3i to 3l on the upstream side and the laminated rotary filters 3g, 3h, 3m and 3n on the downstream side, and the upper and lower laminated shapes toward the downstream side. The spacing between the rotating filters 3 is gradually narrowed, and the flapper 51 gradually increases the squeezing force applied to the object to be processed from the upstream side to the downstream side.

Further, the laminated rotary filters 3a to 3h in the lower row are arranged at predetermined intervals, and are configured to convey solid components by rotating in the same direction (clockwise in FIG. 1). ing. Further, the laminated rotary filters 3i to 3n in the upper row are arranged at predetermined intervals, and rotate in the same direction (counterclockwise in FIG. 1) so as to convey the solid component. It is configured.

Further, the liquid components of the object to be treated are filtered by the laminated rotary filters 3a to 3f and 3i to 3l arranged on the stock solution supply port 4 side. Specifically, the liquid component is filtered by gravity from the filtration grooves of the laminated rotary filters 3a to 3f. This reduces the water content of the object to be treated. Further, the object to be treated is pressed from above and below and dehydrated by the laminated rotary filter bodies 3g, 3h, 3m and 3n arranged on the solid discharge port 5 side. As a result, the water content of the object to be treated is further reduced.

As shown in FIGS. 2 and 3, the motor 2 is provided at one end (Y1 direction side end) in the axial direction (Y direction) of each of the rotating shafts 31 of the plurality of stacked rotary filters 3. There is. The motor 2 is configured to rotationally drive the rotary shaft 31. Specifically, the motor 2 is configured to rotate the rotating shaft 31 of the stacked rotary filter body 3 via the speed reducer 21. The speed reducer 21 decelerates the output of the motor 2 and transmits it to the rotating shaft 31 at a reduction ratio of, for example, about 1/1200.

Further, the motor 2 is connected to the inverter 22 as shown in FIG. Further, the motor 2 is configured to be rotationally driven by the electric power supplied via the inverter 22. The inverter 22 is configured to convert the frequency, current value, and voltage value of the electric power supplied from the power source 9. Further, the inverter 22 is configured to control the frequency of the AC power supplied to the motor 2. This makes it possible to control the rotation speed of the laminated rotary filter body 3. Further, the inverter 22 can detect the supply power value as the degree of load. Further, the control unit 8 is connected to the plurality of inverters 22. The control unit 8 is configured to control the inverter 22 to supply electric power from the power source 9 to each motor 2. The inverter 22 is an example of the "load detection unit" in the claims.

Further, as shown in FIG. 2, one motor 2 is provided for each of the stacked rotary filters 3g, 3h, 3m and 3n arranged on the solid discharge port 5 side. Further, the motor 2 is provided in each of the two stacked rotary filters 3a to 3f, 3i and 3j arranged on the stock solution supply port 4 side, and the stacked rotary filters 3k and 3l are provided. Is provided one for each. Specifically, two stacked rotary filters 3 adjacent to each other in the X direction are rotationally driven by the chain 23 in conjunction with each other.

Further, as shown in FIG. 4, an inverter 22 is provided for each of the motors 2 for rotating the stacked rotary filters 3g, 3h, 3m and 3n arranged on the solid discharge port 5 side. .. Further, a common inverter 22 is provided in each of the motors 2 for rotating the stacked rotary filters 3a to 3f and 3i to 3l arranged on the stock solution supply port 4 side.

As shown in FIG. 5, the stacked rotary filter body 3 includes a plurality of strips stacked along the rotation axis 31.

Specifically, as shown in FIGS. 5 and 6, the stacked rotary filter body 3 includes a plurality of medium-diameter disc strips 301, a plurality of small-diameter disc strips 302, and a plurality of large-diameter disc strips. Contains three types of filters with piece 303. The medium-diameter disk filter piece 301 is formed of, for example, a resin material. The small-diameter disk filter piece 302 and the large-diameter disk frame 303 are formed of, for example, a metal material.

The medium-diameter disk filter piece 301, the small-diameter disk filter piece 302, and the large-diameter disk filter piece 303 all have an annular shape. That is, the medium-diameter disk filter piece 301, the small-diameter disk filter piece 302, and the large-diameter disk frame 303 all have a through hole 304 through which the rotating shaft 31 is inserted. Further, the medium-diameter disk filter piece 301, the small-diameter disk filter piece 302, and the large-diameter disk filter piece 303 are all fitted to the rotating shaft 31 via the through hole 304. Therefore, the medium-diameter disk filter piece 301, the small-diameter disk filter piece 302, and the large-diameter disk filter piece 303 do not substantially move in the direction intersecting the axial direction (Y direction) of the rotating shaft 31. It is configured.

The laminated rotary filter body 3 has a medium-diameter disk filter piece 301, a small-diameter disk filter piece 302, and a large-diameter disk filter piece in a state where the rotary shaft 31 is inserted into the through hole 304 so as to surround the rotary shaft 31. The 303 has a multi-plate structure in which the 303s are alternately laminated in the Y direction. A plurality of medium-diameter disk filter pieces 301, small-diameter disk filter pieces 302, and large-diameter disk filter pieces 303 are provided on one laminated rotary filter body 3, respectively.

The plurality of medium-diameter disk strips 301 are provided so as to be arranged at predetermined intervals in the Y direction. The laminated rotary filter body 3 is configured by alternately arranging (laminating) a large-diameter disk filter piece 303 and a small-diameter disk filter piece 302 between a plurality of medium-diameter disk filter pieces 301 arranged in the Y direction. ing. In short, the laminated rotary filter 3 is formed in the order of medium-diameter disk filter piece 301, large-diameter disk slot piece 303, medium-diameter disk slot piece 301, and small-diameter disk slot piece 302 in the Y direction. It is configured by repeatedly arranging (stacking) the above. Alternatively, each of the filter pieces may be repeatedly arranged (laminated) in the order of the medium-diameter disk frame 301, the small-diameter disk frame 302, the medium-diameter disk filter piece 301, and the large-diameter disk frame 303.

The medium-diameter disk filter piece 301 is provided on the disk-shaped plate-shaped portion 301a, a plurality of (4) convex portions 301b provided on one surface of the plate-shaped portion 301a, and the other surface of the plate-shaped portion 301a. It has a plurality of (4) convex portions 301c.

The plurality of convex portions 301b are arranged at positions separated from the center of the medium-diameter disk strip 301 by a predetermined distance, and are arranged at equal pitch intervals in the circumferential direction of the medium-diameter disk strip 301. The plurality of convex portions 301c are provided at positions overlapping with the convex portions 301b when viewed in the Y direction. Further, the amount of protrusion d1 from one surface of the convex portion 301b is larger than the thickness d3 of the small-diameter disk strip 302 and the thickness d4 of the large-diameter disk strip 303 (d1> d3, d1> d4).

As shown in FIG. 7, the convex portion 301c only slightly protrudes from the other surface of the plate-shaped portion 301a, and is actually located substantially on the same surface as the other surface of the plate-shaped portion 301a. (Approximately flush). Further, the amount of protrusion d2 from the other surface of the convex portion 301c is extremely smaller than the amount of protrusion d1 from one surface of the convex portion 301b (d1 >> d2). In each figure, for convenience of explanation, the protrusion amount d2 of the convex portion 301c is shown larger than the actual protrusion amount.

The medium-diameter disk filter piece 301 brings the convex portion 301b into contact with the convex portion 301c of another medium-diameter disk strip 301 adjacent to one direction side in the Y direction, and brings the convex portion 301c to the other in the Y direction. It is laminated in a state of being in contact with the convex portion 301b of another medium-diameter disk filter piece 301 adjacent to the side. Therefore, the plate-shaped portion 301a of the medium-diameter disc strip 301 is separated from the plate-shaped portion 301a of the other adjacent medium-diameter disc strips 301 by a gap (d1 + d2). That is, the plate-shaped portion 301a of the medium-diameter disc strip 301 is separated from the plate-shaped portion 301a of another adjacent medium-diameter disc strip 301 by the total amount of protrusion of the convex portion 301b and the convex portion 301c. ing.

Further, between two adjacent medium-diameter disc filter pieces 301 (plate-shaped portions 301a), a filtration groove S (see FIG. 8) having a gap (d1 + d2) is formed by the convex portion 301b and the convex portion 301c. ..

As shown in FIG. 6, the small-diameter disk filter piece 302 generally has a disk shape. Further, the small-diameter disc strip 302 is arranged at equal pitch intervals in the circumferential direction, and has a plurality of (4) notches 302a notched from the outer edge portion toward the center of the small-diameter disc strip 302. ing. The plurality of notched portions 302a are provided at positions where they overlap with the convex portions 301b and the convex portions 301c of the medium-diameter disc filter piece 301 when viewed in the Y direction. Further, the cutout portion 302a is configured to engage with the convex portion 301b. The small-diameter disc strip 302 has a notch 302a between two adjacent medium-diameter disc strips 301 (plate-shaped portions 301a) in a state where the notch 302a is engaged with the convex portion 301b of the medium-diameter disc strip 301. Is located in.

As shown in FIG. 8, the thickness d3 of the small-diameter disk strip 302 is smaller than the gap (d1 + d2) between the two adjacent medium-diameter disk strips 301 (plate-shaped portions 301a). Therefore, a filter water outflow groove G1 having a gap (d1 + d2-d3) is formed between the two adjacent medium-diameter disk filter pieces 301 (plate-shaped portion 301a) and the small-diameter disk filter piece 302. ..

That is, a filter water outflow groove G1 having a gap (d1 + d2-d3) is formed in a portion of the filtration groove S between two adjacent medium-diameter disk filter pieces 301 except for the small-diameter disk filter piece 302. Therefore, the small-diameter disk filter piece 302 is configured to be swingable in the swing range α in the Y direction in which the filtration groove S is formed. In the solid-liquid separation device 100, the small-diameter disk filter piece 302 swings with the rotation of the rotating shaft 31, and rotates while rubbing the side surface of the medium-diameter disk filter piece 301. Therefore, the filter water outflow groove G1 (filtration groove S) ) Can be suppressed from clogging. That is, the solid-liquid separation device 100 can self-clean the filter water outflow groove G1 (filtration groove S). Further, the filter water outflow groove G1 is configured to filter the object to be treated by passing the liquid component contained in the object to be treated.

As shown in FIG. 6, the large-diameter disk filter piece 303 has a disk shape. Further, the large-diameter disk strip 303 is arranged at a position separated by a predetermined distance from the center of the large-diameter disk strip 303, and at the same time, a plurality (4 pieces) of penetrations arranged at equal pitch intervals in the circumferential direction. It has a hole 303a. The plurality of through holes 303a are provided at positions overlapping with the convex portions 301b and the convex portions 301c of the medium-diameter disc filter piece 301 when viewed in the Y direction. Further, the through hole 303a is configured to fit into the convex portion 301b and the convex portion 301c of the medium-diameter disc filter piece 301. Further, the large-diameter disc strip 303 has two adjacent medium-diameter disc strips 301 (plate-shaped portions) in a state where the convex portion 301b of the medium-diameter disc strip 301 is fitted into the through hole 303a. It is arranged between 301a).

As shown in FIG. 8, the thickness d4 of the large-diameter disc strip 303 is smaller than the gap (d1 + d2) of the adjacent medium-diameter disc strip 301 (plate-shaped portion 301a). Therefore, a filter water outflow groove G2 having a gap (d1 + d2-d4) is formed between the two adjacent medium-diameter disc strips 301 (plate-shaped portion 301a) and the large-diameter disc strip 303. There is.

That is, a filter water outflow groove G2 having a gap (d1 + d2-d4) is formed in a portion of the filtration groove S between two adjacent medium-diameter disk filter pieces 301 except for the large-diameter disk filter piece 303. Therefore, the large-diameter disk strip 303 is configured to be swingable in the swing range β in the Y direction in which the filtration groove S is formed. In the solid-liquid separation device 100, the large-diameter disk filter piece 303 swings with the rotation of the rotating shaft 31, and rotates while rubbing the side surface of the medium-diameter disk filter piece 301. Therefore, the filter water outflow groove G2 (filtration groove) The clogging of S) can be suppressed. That is, the solid-liquid separation device 100 can self-clean the filter water outflow groove G2 (filtration groove S). Further, the filter water outflow groove G2 is configured to filter the object to be treated by passing the liquid component contained in the object to be treated.

As shown in FIG. 5, the large-diameter disk strip 303 of the laminated rotary filter body 3 in the upper row (lower row) and the large-diameter disk of the laminated rotary filter body 3 in another upper row (lower row) adjacent to each other. The filter pieces 303 are alternately arranged so as to overlap each other in the Y direction. That is, the large-diameter disk filter piece 303 of the laminated rotary filter body 3 in the upper row (lower row) sandwiches the small-diameter disk filter piece 302 of the laminated rotary filter body 3 in the other upper row (lower row) adjacent to the upper row (lower row). It is arranged so as to bite between the two medium-diameter disc strips 301. Further, what is the medium-diameter disk filter piece 301 of the laminated rotary filter body 3 in the upper row (lower row) and the medium-diameter disk filter piece 301 of the laminated rotary filter body 3 in the other upper row (lower row) adjacent to each other? , Are provided in substantially the same range (position) in the Y direction.

As shown in FIG. 1, the solid discharge port 5 is provided with a flapper 51 and a pressure adjusting unit 52. The flapper 51 is configured to apply pressure to the solid component of the object to be treated by the solid-liquid separation device 100. The pressure adjusting unit 52 is configured to adjust the pressure applied by the flapper 51.

The water level sensor 7 is provided in the upper part of the inside of the solid-liquid separation device 100. Further, the water level sensor 7 is provided above (Z1 direction) the stacked rotary filter body 3 (3i) arranged at the uppermost stream in the upper row. The water level sensor 7 includes a sensor 71 and a sensor 72. The sensor 71 detects a low water level, and the sensor 72 detects a higher water level than the sensor 71.

As shown in FIG. 4, the control unit 8 is configured to control the inverter 22 to control the rotation speed of the motor 2. The control unit 8 includes a circuit board and is configured to be controlled by hardware control.

When the inverter 22 supplies the electric power of the frequency controlled by the control unit 8 to the motor 2, the inverter 22 can transmit the information of the drive power as the load degree to the control unit 8. That is, the inverter 22 is configured to be able to detect the load degree of the stacked rotary filter body 3. Specifically, the inverter 22 transmits drive power information to the control unit 8 based on a plurality of threshold values. When the drive power (load degree) is equal to or higher than the first threshold value, the inverter 22 transmits drive power information to the control unit 8. Further, when the drive power (load degree) is equal to or higher than the second threshold value larger than the first threshold value, the inverter 22 transmits the drive power information to the control unit 8. The first threshold value and the second threshold value can be set by the user. For example, the first threshold value is set to the driving power (load degree) at which there is a high possibility that clogging will occur due to the solid component of the object to be processed if the processing proceeds as it is. In other words, the first threshold value is set to the drive power (load degree) that can prevent the blockage by taking measures at this stage because there is still time to cause the blockage. Further, the second threshold value is set to a driving power (load degree) at which clogging occurs due to the solid component of the object to be processed and the risk of damage to the rotated stacked rotary filter body 3 is increased.

Here, in the present embodiment, the control unit 8 is configured to control to increase the rotation speed of the stacked rotary filter body 3 when the load degree detected by the inverter 22 is equal to or higher than the first threshold value. There is. Specifically, during the normal operation of solid-liquid separation, the control unit 8 rotates the laminated rotary filters 3g, 3h, 3m and 3n at a rotation speed smaller than that of the laminated rotary filters 3a to 3f and 3i to 3l. Control to rotate with. Further, when the load degrees of the stacked rotating filters 3g, 3h, 3m and 3n detected by the inverter 22 are equal to or higher than the first threshold value, the control unit 8 of the stacked rotating filters 3g, 3h, 3m and 3n. It is configured to control the rotation speed to be higher than during normal operation.

Further, when the load degrees of the stacked rotating filters 3g, 3h, 3m and 3n detected by the inverter 22 are equal to or higher than the first threshold value, the control unit 8 of the stacked rotating filters 3g, 3h, 3m and 3n. It is configured to control the rotation speed to be substantially equal to the rotation speeds of the laminated rotary filters 3a to 3f and 3i to 3l.

Further, when the load degree of at least one of the load degrees of the stacked rotary filters 3g, 3h, 3m and 3n detected by the inverter 22 is equal to or higher than the first threshold value, the control unit 8 performs all the stacked rotations. It is configured to control to increase the rotation speed of the filter body 3g, 3h, 3m and 3n.

Further, in the control unit 8, at least one of the load degrees of the stacked rotary filters 3g, 3h, 3m and 3n becomes the first threshold value or more, and all the stacked rotary filters 3g, 3h, 3m. When the number of rotations of the plurality of stacked rotating filters 3g, 3h, 3m and 3n detected by the inverter 22 is less than the first threshold value, the stacked rotating filters 3g, It is configured to control to restore the rotation speeds of 3h, 3m and 3n.

Further, when the load degree becomes equal to or higher than the first threshold value and the rotation speed of the stacked rotary filter body 3 is increased, the load degree detected by the inverter 22 after a lapse of a predetermined time is the first threshold value. If it is less than, it is configured to control to return the rotation speed of the stacked rotary filter body 3 to the original value. For example, when the load degree detected by the inverter 22 is less than the first threshold value after 1 minute has elapsed after increasing the rotation speed of the stacked rotary filter body 3, the control unit 8 of the laminated rotary filter body 3 has a load degree of less than the first threshold value. It is configured to control the number of revolutions to be restored.

Further, when the load degree detected by the inverter 22 is equal to or higher than the first threshold value, the control unit 8 controls to increase the rotation speed of the stacked rotary filter body 3 and decrease the supply amount of the undiluted solution. It is configured.

Further, the control unit 8 is configured to control to stop the rotation of the stacked rotary filter body when the load degree detected by the inverter 22 is equal to or higher than the second threshold value larger than the first threshold value. ..

(Rotation speed control process)
Next, with reference to FIG. 9, the rotation speed control process by the control unit 8 will be described.

In step S1 of FIG. 9, it is determined whether or not the load degree is equal to or higher than the first threshold value. Specifically, it is determined whether or not the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the first threshold value. If the degree of load is less than the first threshold value, the determination in step S1 is repeated. If the load degree is equal to or higher than the first threshold value, the process proceeds to step S2.

In step S2, it is determined whether or not the load degree is equal to or higher than the second threshold value. Specifically, it is determined whether or not the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the second threshold value larger than the first threshold value. If the degree of load is less than the second threshold value, the process proceeds to step S3. That is, if at least one of the stacked rotary filters 3g, 3h, 3m and 3n has a load degree of the first threshold value or more and less than the second threshold value, the process proceeds to step S3. If the load degree is equal to or higher than the second threshold value, the process proceeds to step S7.

In step S3, the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n are increased. Specifically, the rotation speeds of the laminated rotating filters 3g, 3h, 3m and 3n are increased to substantially equal to the laminated rotating filters 3a to 3f and 3i to 3l. Further, the supply amount of the undiluted solution supplied from the undiluted solution supply port 4 is reduced. In step S4, the laminated rotary filters 3g, 3h, 3m, and 3n are waited for a predetermined time in a state of increasing the rotation speed. For example, wait for 1 minute to elapse in a state where the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n are increased.

In step S5, it is determined whether or not the load degree is less than the first threshold value. Specifically, it is determined whether or not all of the stacked rotary filters 3g, 3h, 3m and 3n have a load degree of less than the first threshold value. If the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the first threshold value, the determination in step S5 is repeated. Further, if the load degree is less than the first threshold value among the stacked rotary filters 3g, 3h, 3m and 3n, the process proceeds to step S6.

In step S6, the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n are restored. Further, the supply amount of the undiluted solution supplied from the undiluted solution supply port 4 is restored. After that, the process returns to step S1. If it is determined in step S2 that the load degree is equal to or higher than the second threshold value, the rotation of the stacked rotary filters 3a to 3n is stopped in step S7. Further, the supply of the undiluted solution from the undiluted solution supply port 4 is stopped. After that, the rotation speed control process is terminated. Even in the stage of performing the processes of steps S3 to S5, the second threshold value in which the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is larger than the first threshold value is larger than the first threshold value. If it is determined that the above is the case, the process proceeds to step S7.

(Effect of embodiment)
In this embodiment, the following effects can be obtained.

In the present embodiment, as described above, when the load degree detected by the inverter 22 is equal to or higher than the first threshold value, a control unit 8 that controls to increase the rotation speed of the stacked rotary filter body 3 is provided. As a result, the transport resistance increases as the solid-liquid separation process progresses, and when the load degree increases, the rotation speed of the laminated rotary filter 3 can be increased, so that the solid component of the object to be treated can be increased. It can be discharged quickly. Further, if the first threshold value is set to a load degree at which there is a high possibility that clogging will occur due to the solid component of the object to be processed if the treatment proceeds as it is, the solid component when the load degree is equal to or higher than the first threshold value. Is discharged, so that it can be prevented from being blocked by the solid component of the object to be treated. As a result, even when the load degree of the laminated rotary filter 3 is large, it is possible to suppress the time required for the solid-liquid separation process from becoming long, and to suppress the blockage due to the solid component of the object to be treated. The solid component of the object to be treated with low water content can be continuously discharged. Further, since the first threshold value is the driving power (load degree) at which there is a high possibility that clogging will occur due to the solid component of the object to be processed if the processing proceeds as it is, the solid of the object to be processed in the first threshold value. Since it is considered that the water content of the component is sufficiently lowered, the solid component of the object to be treated is increased by increasing the number of rotations of the stacked rotary filter body 3 when the load degree equal to or higher than the first threshold value is detected. Even if it is discharged rapidly, the solid component of the object to be treated with a low water content can be continuously discharged. Immediately after increasing the rotation speed of the laminated rotary filter body 3, a certain amount of the solid component of the object to be treated having a low water content may be discharged, and then the solid component of the object to be treated having a slightly high water content may be discharged. There is sex. However, since the time for detecting the load degree of the laminated rotary filter 3 is set as short as possible after increasing the rotation speed of the laminated rotary filter 3, the return to normal operation should be completed as soon as possible. It is configured to minimize the time during which the solid component of the object to be treated, which has a slightly high water content, may be discharged.

Further, in the present embodiment, as described above, the laminated rotary filters 3g, 3h, 3m and 3n arranged on the solid discharge port 5 side and the laminated body arranged on the undiluted solution supply port 4 side to which the undiluted solution is supplied. The shaped rotary filters 3a to 3f and 3i to 3l are provided, and the control unit 8 is provided with the laminated rotary filters 3g, 3h, 3m and 3n during the normal operation of solid-liquid separation, and the laminated rotary filters 3a to 3a to 3n. When the load degree of the laminated rotary filter body 3g, 3h, 3m and 3n detected by the inverter 22 is equal to or higher than the first threshold value while rotating at a rotation speed smaller than 3f and 3i to 3l, the laminated rotary filter body is used. It is configured to control the rotation speeds of 3g, 3h, 3m and 3n to be higher than those during normal operation. Thereby, during the normal operation of solid-liquid separation, the water content of the object to be treated can be filtered by the laminated rotary filters 3a to 3f and 3i to 3l, and the laminated rotary filters 3g, 3h, 3m and 3n can be used. The object to be treated with filtered water can be squeezed and dehydrated. Further, when the degree of load is equal to or higher than the first threshold value, the number of rotations of the laminated rotary filter 3g, 3h, 3m and 3n is increased as compared with that during normal operation, so that the sufficiently dehydrated object to be processed can be quickly dehydrated. It can be discharged to the water and can effectively suppress clogging due to the solid component of the dehydrated object to be treated.

Further, in the present embodiment, as described above, when the load degree of the laminated rotary filter body 3g, 3h, 3m and 3n detected by the inverter 22 is equal to or higher than the first threshold value, the control unit 8 rotates in a laminated manner. It is configured to control so that the rotation speeds of the filters 3g, 3h, 3m and 3n are substantially equal to the rotation speeds of the stacked rotary filters 3a to 3f and 3i to 3l. As a result, the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n can be increased to the same degree as the rotation speeds of the laminated rotary filters 3a to 3f and 3i to 3l. The amount of the object to be processed sent from the bodies 3a to 3f and 3i to 3l to the laminated rotary filters 3g, 3h, 3m and 3n, and the objects to be processed discharged from the laminated rotary filters 3g, 3h, 3m and 3n. The difference from the amount of can be reduced. As a result, it is possible to prevent the solid component of the object to be further compressed (dehydrated) in the laminated rotary filter body 3g, 3h, 3m and 3n, so that the solid component of the object to be treated does not block the solid component. It can be effectively suppressed.

Further, in the present embodiment, as described above, at least one of the load degrees of the plurality of stacked rotary filters 3g, 3h, 3m and 3n detected by the inverter 22 in the control unit 8 is the first load degree. When it is equal to or more than the threshold value, it is configured to control to increase the rotation speeds of all the stacked rotary filters 3g, 3h, 3m and 3n. As a result, even when the load is concentrated on some of the laminated rotating filters 3g, 3h, 3m and 3n, the rotation speeds of all the laminated rotating filters 3g, 3h, 3m and 3n are increased to cover the surface. Since the solid component of the processed product can be quickly discharged, the load applied to the laminated rotary filter body 3g, 3h, 3m and 3n can be quickly reduced.

Further, in the present embodiment, as described above, the load degree of at least one of the load degrees of the plurality of stacked rotary filters 3g, 3h, 3m and 3n of the control unit 8 is equal to or higher than the first threshold value. When the rotation speeds of all the laminated rotating filters 3g, 3h, 3m and 3n are increased, all the load degrees of the plurality of laminated rotating filters 3g, 3h, 3m and 3n detected by the load detecting unit are the first. When it is less than the threshold value, it is configured to control to restore the rotation speeds of the stacked rotary filters 3g, 3h, 3m and 3n. As a result, the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n are restored to the original values even though the load degrees of some of the laminated rotary filters 3g, 3h, 3m and 3n are large. You can prevent that.

Further, in the present embodiment, as described above, when the load degree becomes equal to or higher than the first threshold value and the rotation speed of the stacked rotating filter is increased, the control unit 8 is detected by the inverter 22 after a predetermined time has elapsed. When the load degree is less than the first threshold value, the control is configured to restore the rotation speed of the stacked rotary filter body 3. As a result, it is possible to suppress the continuation of the operation in a state where the rotation speed of the laminated rotary filter body 3 is increased, so that it is possible to suppress the discharge of the object to be processed in a state of insufficient dehydration. Can be done.

Further, in the present embodiment, as described above, when the load degree detected by the inverter 22 is equal to or higher than the second threshold value larger than the first threshold value, the control unit 8 rotates the stacked rotary filter body 3. It is configured to control to stop. As a result, when the load degree becomes larger than the first threshold value and becomes equal to or higher than the second threshold value, the rotation of the stacked rotary filter body 3 can be stopped, so that the load degree becomes even larger. The rotation shaft 31 and each filter piece (medium-diameter disk filter piece 301, small-diameter disk slot 302, large-diameter disk slot 303) are deformed due to the continuation of operation in the state of being in the state. It can be suppressed.

Further, in the present embodiment, as described above, when the load degree detected by the inverter 22 of the control unit 8 is equal to or higher than the first threshold value, the rotation speed of the laminated rotary filter body 3 is increased and the undiluted solution is used. It is configured to control to reduce the supply amount. As a result, the amount of the object to be processed that flows into the laminated rotary filter body 3 can be reduced, and the amount of the object to be processed discharged from the laminated rotary filter body 3 can be increased. The amount of the object to be treated accumulated in the rotary filter body 3 can be reduced. As a result, the transport resistance can be effectively reduced, so that the load degree can be effectively reduced.

Further, in the present embodiment, as described above, the filter piece includes the large-diameter disk frame 303, the small-diameter disk frame 302, and the medium-diameter disk frame 301. A large-diameter disk filter piece 303 or a small-diameter disk frame piece 302 is arranged so as to be swingable between adjacent medium-diameter disk filter pieces 301. In order to form a filtration groove S between the adjacent medium-diameter disc strips 301, the medium-diameter disc filter pieces 301 are provided with convex portions 301b and 301c that abut on the adjacent medium-diameter disc strips 301. The large-diameter disk filter piece 303 is arranged so as to enter the filtration groove of the stacked rotary filter body 3 adjacent to the solid component in the feeding direction. The medium-diameter disk filter piece 301 is formed of resin. As a result, it is possible to prevent the filtration groove S from being clogged due to the swing of the large-diameter disk filter piece 303 and the small-diameter disk filter piece 302. Further, the weight of the laminated rotary filter body 3 can be reduced as compared with the case where the medium-diameter disk filter piece 301 is formed of metal. As a result, even when the number of stacked strips is increased to increase the size, it is possible to suppress an increase in the load applied to the rotating shaft 31. Then, by combining such a structure of the filter piece and the structure of the solid-liquid separation device 100 according to the above-mentioned one aspect, it is possible to suppress an increase in the load applied to the rotary shaft 31. At 100, it is possible to suppress the time required for the solid-liquid separation treatment from becoming long, and at the same time, suppress the blockage due to the solid component of the object to be treated.

Further, in the present embodiment, as described above, the supply power value of the inverter 22 that controls the frequency of the AC power supplied to the motor 2 is detected as the load degree. As a result, the load degree can be detected by using the supply power value detection unit generally provided in the inverter, so that it is not necessary to provide a detection unit such as a sensor separately from the inverter 22. This makes it possible to suppress an increase in the number of parts. Further, the degree of load can be easily obtained by detecting the power supply value of the inverter 22.

(Modification example)
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the above embodiment, an example of a configuration in which the control unit includes a circuit board and controls by a hardware configuration is shown, but the present invention is not limited to this. In the present invention, the control unit may include a processor such as a CPU, and the processor may be operated by software to perform control.

Further, in the above embodiment, when the load degree is equal to or higher than the first threshold value, the rotation speed of the laminated rotary filter body is increased, and when the load degree is equal to or higher than the second threshold value, the rotation speed of the laminated rotary filter body is increased. Although an example of performing control for stopping is shown, the present invention is not limited to this. In the present invention, when the load degree detected by the load detection unit is greater than or equal to the third threshold value larger than the first threshold value and smaller than the second threshold value, the control unit is controlled to reversely rotate the stacked rotary filter body. May be configured to do. As a result, when the load degree is greater than the first threshold value and is equal to or higher than the third threshold value, the solid component of the object to be processed can be loosened by the reverse rotation of the laminated rotary filter body. It is possible to facilitate the discharge of solid components.

For example, the control unit may perform the rotation speed control process shown in FIG. In step S11 of FIG. 10, it is determined whether or not the load degree is equal to or higher than the first threshold value. Specifically, it is determined whether or not the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the first threshold value. If the degree of load is less than the first threshold value, the determination in step S11 is repeated. If the load degree is equal to or higher than the first threshold value, the process proceeds to step S12.

In step S12, it is determined whether or not the load degree is greater than or equal to the third threshold value larger than the first threshold value and smaller than the second threshold value. Specifically, it is determined whether or not the load degree of at least one of the laminated rotary filters 3g, 3h, 3m and 3n is equal to or higher than the third threshold value. If the degree of load is less than the third threshold value, the process proceeds to step S13. That is, if all the load degrees of the laminated rotary filter bodies 3g, 3h, 3m and 3n are less than the third threshold value, the process proceeds to step S13. Further, if the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the third threshold value, the process proceeds to step S17.

In step S13, the rotation speed of the laminated rotary filter body 3 is increased. Specifically, the rotation speeds of the laminated rotating filters 3g, 3h, 3m and 3n are increased to substantially equal to the laminated rotating filters 3a to 3f and 3i to 3l. Further, the supply amount of the undiluted solution supplied from the undiluted solution supply port 4 is reduced. In step S14, the laminated rotary filters 3g, 3h, 3m, and 3n are waited for a predetermined time in a state of increasing the rotation speed. For example, wait for 1 minute to elapse in a state where the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n are increased.

In step S15, it is determined whether or not the load degree is less than the first threshold value. Specifically, it is determined whether or not all of the stacked rotary filters 3g, 3h, 3m and 3n have a load degree of less than the first threshold value. If the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the first threshold value, the determination in step S15 is repeated. Further, if the load degree is less than the first threshold value among the stacked rotary filters 3g, 3h, 3m and 3n, the process proceeds to step S16.

In step S16, the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n are restored. Further, the supply amount of the undiluted solution supplied from the undiluted solution supply port 4 is restored. After that, the process returns to step S11. Even in the stages of steps S13 to S15, the second threshold value in which the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is larger than the first threshold value is larger than the first threshold value. If it is determined that the above is the case, the process proceeds to step S21.

When it is determined in step S12 that the load degree is equal to or higher than the third threshold value, it is determined in step S17 whether or not the load degree is greater than or equal to the second threshold value than the first threshold value. Specifically, it is determined whether or not the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the second threshold value. If the degree of load is less than the second threshold value, the process proceeds to step S18. That is, if all the load degrees of the laminated rotary filter bodies 3g, 3h, 3m and 3n are less than the second threshold value, the process proceeds to step S18. Further, if the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the second threshold value, the process proceeds to step S21.

In step S18, the laminated rotary filters 3a to 3n are rotated in the reverse direction. That is, all the laminated rotary filters 3 are rotated in the reverse direction. Specifically, the laminated rotary filter 3 is rotated in the reverse direction for a predetermined time, and then the laminated rotary filter 3 is rotated forward for a predetermined time, which is repeated a predetermined number of times. For example, the stacked rotary filter body 3 is rotationally driven by switching between reverse rotation and forward rotation every 10 seconds. The predetermined number of times of repeating the reverse rotation and the forward rotation varies depending on the properties of the object to be processed, but is about 2 to 3 times. It is desirable to increase the rotation speeds of the laminated rotating filters 3g, 3h, 3m and 3n both in the reverse rotation and the forward rotation to such an extent that they are substantially equal to the laminated rotating filters 3a to 3f and 3i to 3l. .. However, the rotation speeds of the stacked rotating filters 3g, 3h, 3m and 3n in the forward rotation may be set to the same low speed rotation as in the normal operation. Further, the rotation speeds of the laminated rotary filters 3g, 3h, 3m and 3n in the reverse rotation may be set to the same low speed rotation as in the normal operation. Further, the supply amount of the undiluted solution supplied from the undiluted solution supply port 4 is reduced. In the forward rotation, the object to be processed is sent from the stock solution supply port 4 side to the solid discharge port 5 side. Further, in the reverse rotation, the object to be processed is sent from the solid discharge port 5 side to the stock solution supply port 4 side. Then, the process proceeds to step S19.

In step S19, it is determined whether or not the load degree is less than the third threshold value. Specifically, it is determined whether or not all of the stacked rotary filters 3g, 3h, 3m and 3n have a load degree of less than the third threshold value. If the load degree of at least one of the stacked rotary filters 3g, 3h, 3m and 3n is equal to or higher than the third threshold value, the determination in step S19 is repeated. Further, if the load degree is less than the third threshold value among the stacked rotary filters 3g, 3h, 3m and 3n, the process proceeds to step S20.

In step S20, the rotation directions of the laminated rotary filters 3a to 3n are restored. That is, the laminated rotary filters 3a to 3n are rotated forward. After that, the process returns to step S11. That is, the load degree of at least one of the stacked rotating filter bodies 3g, 3h, 3m, and 3n becomes the third threshold value or more, and the stacked rotating filter bodies 3 are alternately driven by reverse rotation and forward rotation. In this case, after returning the rotation direction to the original value, in step S11, it is determined whether or not the load degree is smaller than the first threshold value. When the load degree is equal to or higher than the first threshold value, the process proceeds to step S13 through step S12, and the rotation speed of the stacked rotary filter body 3 is increased. On the other hand, when the load degree is less than the first threshold value, the determination in step S11 is repeated. That is, it is returned to the normal operation, and the rotation speeds of the stacked rotary filters 3a to 3n are returned to their original values. Further, the supply amount of the undiluted solution supplied from the undiluted solution supply port 4 is restored. Even in the stages of steps S13 to S15 and steps S18 to S19, at least one of the stacked rotary filters 3g, 3h, 3m and 3n has a third threshold value. If it is determined that the threshold value is larger than the value and is equal to or higher than the second threshold value, the process proceeds to step S21.

When it is determined in step S17 that the load degree is equal to or higher than the second threshold value, the rotation of the stacked rotary filters 3a to 3n is stopped in step S21. Further, the supply of the undiluted solution from the undiluted solution supply port 4 is stopped. After that, the rotation speed control process is terminated.

Further, in the present invention, the control unit is configured to control the stacked rotating filter to rotate in the reverse direction when the load degree detected by the load detection unit is equal to or greater than the third threshold value smaller than the first threshold value. You may. That is, when the load detection unit detects a load degree smaller than the first threshold value and equal to or higher than the third threshold value, the control unit repeats reverse rotation and forward rotation of the stacked rotary filter every 10 seconds. Take control. Further, the control unit controls to increase the rotation speed of the stacked rotary filter body when the load degree is equal to or higher than the first threshold value larger than the third threshold value.

Further, in the above embodiment, an example of the configuration in which the load degree is detected by the inverter is shown, but the present invention is not limited to this. In the present invention, the load degree may be detected by a device other than the inverter. For example, a sensor that detects the current value may be provided separately from the inverter to detect the degree of load. Further, a torque sensor may be provided to detect the torque of the laminated rotary filter body as the load degree. Further, a strain sensor may be provided to detect the strain of the rotating shaft or the like as the degree of load. Further, a pressure sensor may be provided to detect the pressure of the object to be processed sent by the stacked rotary filter as the degree of load.

Further, in the above embodiment, an example in which the medium-diameter disk strip is formed so that the amount of protrusion of the convex portion on one surface of the medium-diameter disk filter piece and the amount of protrusion of the convex portion on the other surface are different from each other. As shown, the present invention is not limited to this. In the present invention, the medium-diameter disk strip may be formed so that the amount of protrusion of the convex portion on one surface of the medium-diameter disk strip and the amount of protrusion of the convex portion on the other surface are the same as each other. ..

Further, in the above embodiment, an example in which convex portions are formed on one surface and the other surface of the medium-diameter disk filter piece, respectively, is shown, but the present invention is not limited to this. In the present invention, the convex portion may be formed only on one surface of the medium-diameter disk filter piece and one of the other surfaces.

Further, in the above embodiment, when the load degree becomes equal to or higher than the first threshold value and the rotation speed of the stacked rotating filter body is increased, the load degree detected by the load detection unit after a lapse of a predetermined time is the first threshold value. The present invention is not limited to this, although an example of a configuration in which control for returning the rotation speed of the stacked rotary filter body to the original value is shown when the value is less than the above. In the present invention, when the load degree is equal to or higher than the first threshold value and the rotation speed of the stacked rotating filter is increased, the load degree detected by the load detection unit is smaller than the first threshold value and less than the fourth threshold value. In some cases, control may be performed to restore the rotation speed of the laminated rotary filter body.

Further, in the above embodiment, an example in which the motor is arranged only on one side in the axial direction of the rotating shaft is shown, but the present invention is not limited to this. In the present invention, the motors may be arranged alternately on one side and the other side in the axial direction of the rotating shaft. Further, the motors may be arranged on both one side and the other side in the axial direction of the rotating shaft.

Further, in the above embodiment, an example of a configuration in which a plurality of second stacked rotary filters are rotationally driven by a common motor has been shown, but the present invention is not limited to this. In the present invention, a motor may be provided for each of the second stacked rotary braces to rotate and drive them.

Further, in the above-described embodiment, an example of a configuration in which an inverter is provided for each of the plurality of first stacked rotating filters has been shown, but the present invention is not limited to this. In the present invention, a common inverter may be provided for each of a predetermined number of the first stacked rotating filters.

Further, in the above-described embodiment, an example of a configuration in which a common inverter is provided for a plurality of second stacked rotary filters has been shown, but the present invention is not limited to this. In the present invention, an inverter may be provided for each of the plurality of second stacked rotating filters.

Further, in the above embodiment, when the load degree detected by the load detection unit is equal to or higher than the first threshold value, the number of rotations of the laminated rotary filter body is increased and the supply amount of the undiluted solution is controlled to be decreased. Although an example is shown, the present invention is not limited to this. In the present invention, when the load degree detected by the load detection unit is equal to or higher than the first threshold value, the supply of the undiluted solution may be controlled to be stopped, or the supply amount of the undiluted solution may be continued as it is without being changed. good.

Further, in the present invention, when the load degree detected by the load detection unit is equal to or higher than the first threshold value, the pressure adjustment unit is adjusted in the opening direction of the flapper to reduce the pressure acting on the discharged object to be processed. May be good.

Further, in the above embodiment, for convenience of explanation, the processing operation of the control unit has been described using a flow-driven flowchart in which the processing operations are sequentially performed along the processing flow, but the present invention is not limited to this. In the present invention, the processing operation of the control unit may be performed by event-driven type (event-driven type) processing in which processing is executed in event units. In this case, it may be completely event-driven, or it may be a combination of event-driven and flow-driven.

2 Motor 3 Stacked rotary filter 3a, 3b, 3c, 3d, 3e, 3f, 3i, 3j, 3k, 3l Stacked rotary filter (second laminated rotary filter)
3g, 3h, 3m, 3n laminated rotary filter (first laminated rotary filter)
4 Undiluted solution supply port 5 Solid discharge port 8 Control unit 22 Inverter (load detection unit)
31 Rotating shaft 100 Solid-liquid separator 301 Medium-diameter disk filter piece (filter piece)
301b, 301c Convex part 302 Small diameter disk filter piece (filter piece)
303 Large-diameter disk filter piece (filter piece)
310 2nd rotation shaft S Filtration groove

Claims (10)

The axis of rotation and
A laminated rotary filter body including a plurality of strips laminated along the rotation axis and having a filtration groove formed between the filter strips.
A motor that drives the rotary shaft to rotate,
A load detection unit that detects the degree of drive load of the stacked rotary filter body by the motor, and
A control unit for controlling the rotation speed of the laminated rotary filter body is provided.
When the degree of drive load detected by the load detection unit is equal to or higher than the first threshold value, which is a reference value at which clogging occurs due to the solid component of the object to be processed, the control unit determines the rotation speed of the stacked rotary filter body. A solid-liquid separator configured to control the increase. A plurality of stacked rotary filters are arranged in two rows above and below toward the solid discharge port so as to send the solid component of the supplied undiluted solution to the solid discharge port, and the end portion on the solid discharge port side. The first laminated rotary filter body arranged in the above and the second laminated rotary filter body arranged at the end on the stock solution supply port side to which the undiluted solution is supplied are included.
During the normal operation of solid-liquid separation, the control unit rotates the first stacked rotary filter at a rotation speed smaller than that of the second stacked rotary filter, and detects the load by the load detection unit. When the degree of drive load of the first stacked rotary filter body is equal to or higher than the first threshold value, the control is configured to increase the rotation speed of the first stacked rotary filter body as compared with that during normal operation. , The solid-liquid separation device according to claim 1. When the drive load degree of the first stacked rotary filter body detected by the load detection unit is equal to or higher than the first threshold value, the control unit sets the rotation speed of the first stacked rotary filter body to the second. The solid-liquid separation device according to claim 2, which is configured to control the rotation speed to be substantially equal to the rotation speed of the laminated rotary filter body. A plurality of the first laminated rotary filters are provided, and the first laminated rotary filter body is provided.
The load detection unit is provided on each of the plurality of first stacked rotary filters.
When at least one of the drive load degrees of the plurality of first stacked rotary filters detected by the load detection unit is equal to or higher than the first threshold value, the control unit has all the first stacks. 1. The solid-liquid separation device according to claim 2 or 3, which is configured to control to increase the rotation speed of the laminated rotary filter body. In the control unit, at least one of the drive load degrees of the plurality of first stacked rotary filters is equal to or higher than the first threshold value, and the rotation speeds of all the first stacked rotary filters When the value is increased, the rotation of the first stacked rotary filter is rotated when all the drive load degrees of the plurality of first stacked rotary filters detected by the load detection unit are less than the first threshold value. The solid-liquid separation device according to claim 4, which is configured to control the number to be restored. When the drive load degree becomes equal to or higher than the first threshold value and the rotation speed of the stacked rotary filter body is increased, the control unit determines the drive load degree detected by the load detection unit after a lapse of a predetermined time. The solid-liquid separation device according to any one of claims 1 to 5, which is configured to control the rotation speed of the stacked rotary filter to be restored when the threshold value is less than one. The control unit is configured to control to stop the rotation of the stacked rotary filter body when the drive load degree detected by the load detection unit is equal to or higher than the second threshold value larger than the first threshold value. The solid-liquid separation device according to any one of claims 1 to 6. When the degree of drive load detected by the load detection unit is equal to or higher than the first threshold value, the control unit controls to increase the rotation speed of the stacked rotary filter and reduce the supply amount of the undiluted solution. The solid-liquid separation device according to any one of claims 1 to 7, which is configured as described above. The filter piece includes a large-diameter disk filter piece, a small-diameter disk disk piece, and a medium-diameter disk disk piece.
The large-diameter disc or the small-diameter disc strip is swingably arranged between the adjacent medium-diameter disc strips.
The medium-diameter disk strip has a convex portion that abuts on the adjacent medium-diameter disk strip to form the filtration groove between the adjacent medium-diameter disk strips.
The large-diameter disk strip is arranged so as to enter the filtration groove of the laminated rotary filter body adjacent to the solid component in the feeding direction.
The solid-liquid separation device according to any one of claims 1 to 8, wherein the medium-diameter disk strip is made of a resin. The load detecting unit is configured to detect the supply power value of the inverter that controls the frequency of the AC power supplied to the motor as the drive load degree, according to any one of claims 1 to 9. Solid-liquid separator.

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