JPH07213817A - Solid-liquid separator - Google Patents

Abstract

PURPOSE:To provide a solid-liquid separator capable of prolonging the service life of a filter cloth and correcting the meandering of the filter cloth with a simple structure. CONSTITUTION:This solid-liquid separator is equipped with a filter cloth 2 provided to be freely circulately traveled on a fixed track, a solid/liquid feeding part 21 for feeding solid/liquid to the filter cloth, a meandering adjustment roll 106 for guiding the traveling of the filter cloth 2, a vacuum hopper having a lot of filter cloth guide rolls at the opening part, and a sensor for detecting the meandering of the filter cloth. The filter cloth guide roll 106 or the evacuated hopper are rotated based on a detection signal from the sensor to adjust the traveling direction of the filter cloth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation device, and more particularly to a solid-liquid separation device called a filter cloth traveling type filter and a filter cloth traveling type dehydrator.

[0002]

2. Description of the Related Art An endless filter cloth is provided which is capable of traveling in one direction on a fixed track, and a solid-liquid is supplied to the surface of the filter cloth to separate the solid component and the liquid component in the solid-liquid. A solid-liquid separation device for separation is disclosed in, for example, Japanese Patent Publication No. 1-18768. In the case of this known solid-liquid separator, the unfiltered components remaining on the filter cloth are squeezed out when the filter cloth passes between the transfer drum and the squeeze roll, that is to say dewatering under pressure. The cake is formed into a cake, and this cake is transferred to a transfer drum. After this, the cake is scraped off the transfer drum and discharged to the outside of the solid-liquid separation device.

In order to stabilize the running of the filter cloth in this type of solid-liquid separation device, running guides for guiding both side ends of the filter cloth are provided, or feed holes are provided at both side ends of the filter cloth. It is conceivable that a feed pin that engages with the feed hole is provided at both ends of a guide roll that guides the running of the filter cloth, while connecting the rubber belt formed by the above.

[0004]

However, in the former case of guiding the running of the filter cloth, since the side end of the filter cloth slides in contact with the running guide, the wear of the side end is promoted, and The life will be shortened. Further, in the latter case, not only special sewing or a guide roll with a feed pin is required for connecting the filter cloth and the rubber belt,
Since the rubber belt is thicker than the filter cloth, in order to enable pressure dehydration of the non-filtered component between the transfer drum and the pressing roll described above, it is necessary to provide a step at both ends of these drum and roll. However, the structure is complicated, and the solid-liquid separation device cannot be provided at low cost.

The present invention has been made based on the above-mentioned circumstances. The object of the present invention is to enable the filter cloth to have a long life and to easily correct the meandering of the filter cloth with a simple structure. It is to provide a solid-liquid separator capable of performing the above.

[0006]

In order to achieve the above-mentioned object, the solid-liquid separation device of the present invention has an endless filter cloth provided so as to be able to travel in one direction on a fixed track, and a surface of the filter cloth. It is provided with a solid-liquid supply unit for supplying solid-liquid, a detection sensor for detecting meandering of the filter cloth, and means for adjusting the traveling direction of the filter cloth based on a detection signal from the detection sensor.

For example, the adjusting means is realized by a meandering adjusting roll which guides the running of the filter cloth, and the meandering adjusting roll is rotatable around one end thereof in the front-back direction of the running direction of the filter cloth. Further, when the solid-liquid separation device is provided with a hopper for collecting the liquid component that has passed through the filter cloth, and a guide roll arranged side by side in the running direction of the filter cloth at the upper opening of the hopper, the adjusting means Has means for supporting the hopper so as to be rotatable in a plane parallel to the traveling direction of the filter cloth.

[0008]

According to the solid-liquid separation device described above, when meandering occurs in the filter cloth running on a certain track, the meandering is detected by the detection sensor, and the detection signal from the detection sensor is received, The adjusting means adjusts the traveling direction of the filter cloth,
Correct the meandering of the filter cloth. When the adjusting means is the meandering adjusting roll, when the meandering adjusting roll is rotated back and forth in the running direction of the filter cloth, the running direction of the filter cloth passing through the meandering adjusting roll is adjusted.

When the hopper and the guide roll are provided, and the adjusting means has means for rotatably supporting the hopper, the hopper is rotated based on the detection signal from the detection sensor and passes through the hopper. The running direction of the filter cloth is adjusted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a filter cloth traveling type transfer dehydrator is schematically shown as a solid-liquid separating device. This dehydrator is provided with an endless filter cloth 2. The filter cloth 2 is stretched around the drive roll 4 and the guide rolls 8 and 10 in a tensioned state, and both side ends thereof are unconstrained.

A dewatering section 11 is provided between the drive roll 4 and the guide roll 10, and a recovery hopper 104 is arranged below the dewatering section 11. The dewatering section 11 is provided with a main transfer drum 12, and in addition to the drive roll 4, two pressing rolls 14 and 16 are pressed against the main transfer drum 12 via the filter cloth 2. Each of the compression rolls 14 and 16 and the drive roll 4 is biased toward the main transfer drum 12 by a pressing spring 19.

Further, the guide roll 10 and the main transfer drum 1
A sub-transfer drum 18 having a diameter smaller than that of the main transfer drum 12 and a squeezing roll 20 are disposed between the sub-transfer drum 18 and the main transfer drum 12. It is pressed against the filter cloth 2 through.
Each of the rolls and drums described above defines a fixed track of the filter cloth 2, that is, an endless traveling path, along which the filter cloth 2 travels in the direction of arrow A in FIG. It is possible to go around.

In the dewatering section 11, the sub-transfer drum 18 and the pressing roll 20 on the upstream side in the running direction A of the filter cloth 2 constitute a first pressing portion, and the main transfer drum 12 on the downstream side, The squeezing rolls 14 and 16 and the drive roll 4 form a second pressure unit. Therefore, as viewed in the running direction of the filter cloth 2, the sub-transfer drum 18 and the pressing roll 2
0 constitutes a first transfer roll and a first pressing roll, and the main transfer drum 12 and the pressing rolls 14 and 16 constitute a second transfer drum and a second pressing roll.

A wedge-shaped scraper 13 is arranged near the main transfer drum 12, and a scraper 15 similar to the scraper 13 is provided on the sub-transfer drum 18. A chute 17 is arranged immediately below the scraper 13, and the chute 17 extends downward from the outer surface of the main transfer drum 12.

As is apparent from FIG. 1, the filter cloth 2 is stretched from the guide roll 8 toward the guide roll 10 at an angle θ slightly upward with respect to the horizontal plane, and this angle θ is fixed. It is preferable that the depth of the liquid supply section 21 be as small as possible and that the contact area between the solid liquid SL and the filter cloth 2 be large, in the range of 5 to 20 °. The filter cloth 2 is preferably, for example, one described in JP-A-58-207917 and JP-A-59-115720. That is, as shown in FIG. 3, the filter cloth 2 uses a knitted fabric or a woven fabric substrate 22 that uses synthetic fiber multifilaments (including spun yarn) having a single yarn diameter of 0.1 to 10 microns, The surface of the material 22 is a filter cloth 2
Is raised in the circumferential direction of the filter cloth 2 and the thickness of the cloth 2 is 0.1 to 10
It is preferable that micron naps 24 are formed, and the naps 24 form the filter layer 26. Since the filter cloth 2 is raised in the circumferential direction, the raised cloth 24 lies in that direction, that is, the filter cloth 2 has directionality. Filter cloth 2
The end edges are endless because the both end edges are separably connected by the surface fastener 28. In use thereof, the filter cloth 2 is stretched so that the naps 24 face in a direction opposite to the running direction A of the filter cloth 2. The surface fastener 28
Instead of, by side fasteners and racing,
Both end edges of the filter cloth 2 can also be connected so that they can be separated and attached.

As shown in FIGS. 3 and 4, both ends of the filter cloth 2 are covered with cloth pieces 30. The cloth piece 30 is sewn to the filter cloth 2 from the filter layer 26 side to protect the hook-and-loop fastener 28. Further, both ends of the filter cloth 2 are edging portions 2a which are folded back and sewn. The solid-liquid supply section 21 includes the guide rolls 8 and 10.
It is located on the guide roll 8 side in between, and the details thereof are shown in FIG. The solid-liquid supply section 21 includes a solid-liquid supply tank 32, and a discharge pipe 36 is rotatably attached to the tank wall of the solid-liquid supply tank 32. A portion of the discharge pipe 36 on the inner end side is bent upward in the solid-liquid supply tank 32, and by the rotation of the discharge pipe 36,
As shown by the chain double-dashed line in FIG. 5, the level position of its inner end,
That is, the liquid level of the solid liquid SL in the solid liquid supply tank 32 can be adjusted according to the properties of the filter cloth 2 and the solid liquid SL.

The solid-liquid supply tank 32 uses a part of the tank body to form a pair of solid-liquid supply frames 38, and the lower edges of the solid-liquid supply frames 38 are bent inward.
A sheet 40 made of cloth, a synthetic resin such as vinyl chloride, is attached between the solid-liquid supply frames 38 from the lower side. The sheet 40 prevents contact between the lower edge of the solid-liquid supply frame 38 and the filter cloth 2. The solid-liquid SL is prevented from escaping from the solid-liquid supply frame 38. The sheet 40 has a large notch on the front end side.

Above the solid-liquid supply tank 32, a solid-liquid introducing pipe 50 is provided.
The solid-liquid SL is introduced into the solid-liquid supply tank 32 through the solid-liquid introduction period 50. Referring to FIG. 1 again, the vacuum suction section 52 is provided on the back side of the filter cloth 2 so that the solid-liquid supply section 21 and a part thereof face each other.
The vacuum suction section 52 has a hopper, that is, a vacuum hopper 54. This decompression hopper 54
Is connected to a suction source 58 via an intake pipe 56, and the intake pipe 56 has an intake port 60 opened toward the inside of the decompression hopper 54.
have. The suction source 58 exhausts the inside of the decompression hopper 54 through the intake pipe 56, and the back surface side of the filter cloth 2 is made of water column 500
It is possible to maintain a reduced pressure of over mm.

The decompression hopper 54 is provided with a discharge pipe 62, and the discharge pipe 62 has a discharge port 64 opening at the bottom of the decompression hopper 54. The upper surface of the decompression hopper 54 is open to form a decompression suction port 66. The intake port 60 of the intake pipe 56 is positioned at a higher level than the exhaust port 64 so that the filtrate does not enter. The intake pipe 56 and the discharge pipe 62 have a horizontal portion outside the decompression hopper 54, and the horizontal portion of the intake pipe 56 is positioned at a higher level than the horizontal portion of the discharge pipe passage 62. The lower end of the discharge conduit 62 is exposed to the water in the seal pot 70 to seal the reduced pressure of the reduced pressure suction section 52 with water.

The upper opening of the decompression hopper 54, that is, the decompression suction port 66 is defined by a suction frame 72 as shown in FIG. A punching metal 71 and a filter cloth guide roll group 74, 76, 78 are supported by the suction frame 72. When viewed in the running direction A of the filter cloth 2, the filter cloth guide roll groups 74 and 78 located on the left and right sides of the filter cloth 2 are the suction frames 72.
With respect to the center line of the above, the spread angle is set in the range of 0.5 to 5 °. The central filter cloth guide roll group 76 extends straight along its center line.

In the filter cloth guide roll groups 74, 76, 78, each pair of guide rolls facing each other, that is, the filter cloth guide rolls 74a, 76a, 78a, has a common shaft at both ends via bearings (not shown). The shaft 80 is rotatably supported by 80, and both ends of the common shaft 80 are supported by the suction frame 72. Further, the suction frame 72 has a filter cloth guide roll group 74,
A pair of auxiliary frames 82 for partitioning the installation regions of 76 and 78 are provided, and each common shaft 80 is fitted and supported in a U-shaped hole (not shown) formed in the auxiliary frame 82. As is clear from FIG. 6, the common shaft 80 has elasticity to some extent, which allows the filter cloth guide roll 74 to move.
The deviation of the axes of a, 76a and 78a can be absorbed by the bending.

As shown in FIGS. 6 and 7, a bracket 84 is provided so as to project from one side surface of the suction frame 72, and this bracket 84 is seen in the running direction of the filter cloth 2.
It is located in the center. The bracket 84 is rotatably attached to a pivot shaft 86, which is supported by the main frame of the dehydrator.
On the other hand, an arm 88 is provided so as to project from the other side surface of the suction frame 72, and the first cylinder 90 is provided at the tip of the arm 88.
Piston rod 87 is connected. The cylinder body of the first cylinder 90 is also supported by the main frame of the dehydrator.

The first cylinder 90 is composed of a double-acting pneumatic or hydraulic cylinder, and is connected to a pneumatic or hydraulic pressure source 93 via a solenoid valve 91.
It consists of a 4-port 3-position electromagnetic directional control valve.
When the piston rod of the first cylinder 90 is expanded or contracted by the switching operation of the electromagnetic valve 91, the suction frame 72, that is, the decompression hopper 54 as a whole is rotated about the pivot shaft 86 according to the expansion and contraction. At this time, the decompression hopper 54 has its decompression suction port 66, that is, the filter cloth guide roll groups 74, 7
6, 78 are rotated along the running surface of the filter cloth 2.

The bracket 84 and the pivot 86 described above
Constitutes an adjusting means for adjusting the traveling direction of the filter cloth 2, that is, a supporting means for rotatably supporting the decompression hopper 54, as will be described later, and the arm 88 and the first cylinder 90 are decompressed. It constitutes a drive means of the hopper 54. In the figure, a guide for guiding the rotation of the decompression hopper 54 is not shown. Further, in order to enable the decompression hopper 54 to rotate, at least a part of the suction pipe 56 and the discharge pipe 62 extending from the decompression hopper 54 is made of a flexible hose.

Further, as shown in FIG. 8, as the filter cloth 2 runs, the filter cloth guide roll group 7 of the decompression hopper 54 is moved.
As described above, the filter cloth 2 is wound around the individual filter cloth guide rolls 74a, 76a, 78a of each roll group when passing over 4, 76, 78. And run. Here, the wrapping angle α of the filter cloth 2 with respect to these filter cloth guide rolls is determined according to the number of rolls in the roll group, and is, for example, 20 to 120.
It is preferably in the range of °.

Referring again to FIG. 1, a water spray nozzle 92 is disposed downstream of the drive roll 4 as viewed in the running direction of the filter cloth 2. Although not shown in detail, the water spray nozzle 92 is a pipe member having corrosion resistance, to which a large number of nozzle elements are attached, so that the cleaning water supplied to the pipe member is applied to the surface of the filter cloth 2 from each nozzle. The filter cloth 2 is sprayed toward the surface of the filter cloth 2 to wash it, that is, to wash the surface of the filter cloth 2.

A water spray nozzle 94 is also arranged on the upstream side of the guide roll 8, and the water spray nozzle 94 has the same structure as the water spray nozzle 92. The water spray nozzle 94 sprays cleaning water toward the back surface of the filter cloth 2 to clean or backwash the filter cloth 2 from the back surface thereof. On the water spray nozzle 92 side, a filter cloth receiver 96 made of a pipe is arranged so as to face the water spray nozzle 92, and the filter cloth receiver 96 is in contact with the back surface of the filter cloth 2. .

Further, on the side of the water spray nozzle 94, there is provided a reduced pressure suction box 100 which faces the water spray nozzle 94 with the filter cloth 2 interposed therebetween. This reduced pressure suction box 100 is connected through a connection path (not shown). It is connected to the intake pipe 56 described above. Vacuum suction box 100
Has its upper surface opened over the entire width of the filter cloth 2, and a filter cloth guide roll 102 similar to the filter cloth guide roll of the decompression hopper 54 is attached to this opening. These filter cloth guide rolls 102 prevent the filter cloth 2 from bending due to vacuum suction.
As described above, the back surface of the filter cloth 2 has the water spray nozzle 94.
Since the surface of the filter cloth 2 is vacuum-sucked by the vacuum suction box 100 at the same time that the cleaning water is sprayed from the surface, dirt inside the filter cloth 2 is sucked and removed, and the backwashing efficiency thereof is significantly improved. .

Between the water spray nozzle 92 and the water spray nozzle 94 described above, a meandering adjusting roll 106 is disposed. As shown in FIG. 9, the meandering adjusting roll 106 runs in the traveling direction of the filter cloth 2. It extends across A. The meandering adjusting roll 106 is made of a hollow pipe member, and is rotatably attached to the roll shaft 108. One end of the roll shaft 108 has a mounting ring 110, and the mounting ring 110 has a vertical pin 112.
It is rotatably fitted in. The vertical pin 112 is
It is fixed to the main frame side described above. A piston rod 116 of a second cylinder 114 is connected to the other end of the roll shaft 108.
Has its piston rod 116 expandable and contractable in the direction of arrow B in the figure.

The second cylinder 114 also comprises a double-acting pneumatic or hydraulic cylinder, and is connected to the above-mentioned pressure source 93 via a solenoid valve 115. This solenoid valve 115 also comprises a 4-way 3-position solenoid directional control valve, as is apparent from the drawing. When the second cylinder 114 is expanded / contracted by the switching operation of the solenoid valve 115, the meandering adjusting roll 106 moves the vertical pin 1 according to the expansion / contraction.
It is possible to rotate about 12 in a horizontal plane. The rotation of the meandering adjusting roll 106 drags the filter cloth 2 in the width direction thereof, whereby the traveling direction of the filter cloth 2 can be changed when the filter cloth 2 passes through the meandering adjusting roll 106. Therefore, the meandering adjusting roll 106 described above also constitutes an adjusting means for adjusting the traveling direction of the filter cloth 2, and the second cylinder 114 and the solenoid valve 115 are
It constitutes a drive means of the meandering adjusting roll 106.

In order to reliably change the traveling direction of the filter cloth 2 in this manner, it is necessary to secure a sufficient contact area between the meandering adjusting roll 106 and the filter cloth 2. For this reason,
As shown in FIG. 10, the winding angle β of the filter cloth 2 with respect to the meandering adjusting roll 106 is preferably in the range of 30 to 90 °. In connection with the above-described rotation operation of the meandering adjusting roll 106, the above-described rotation operation of the decompression hopper 54, and the stop operation for the unadjustable meandering of the filter cloth 2, the dehydrator detects the meandering of the filter cloth 2. 2 are provided, and the arrangement of these detection sensors is shown in FIG. First, one of the first detection sensors 118 is arranged on one side of the filter cloth 2 on the guide roll 8 side, and the other pair of left and right second detection sensors 122, 124 is arranged on the guide roll 10 side. It is arranged on both sides of the cloth 2. These second detection sensors 122 and 124 have a role of stopping the operation of the solid-liquid separation device when abnormal meandering occurs in the filter cloth 2, and therefore the first detection sensor 118 is
It is positioned closer to the side edge of the filter cloth 2 than the second detection sensors 122 and 124.

Since the above-mentioned detection sensors have the same structure, only the first detection sensor 118 will be specifically shown in FIG. 11 and described. The first detection sensor 118 has a U-shaped holder 126.
The filter 26 is arranged so as to sandwich the side edge of the filter cloth 2 from above and below. Therefore, in order to detect the traveling state of the filter cloth 2, the side edge of the filter cloth 2 can be brought into the holder 126 without contacting it.

The inner surface of the holder 126 facing each other is located on the front end side, and one of which is provided with a transmitting portion 128,
The receiving unit 130 is provided on the other side. Transmitter 128
Outputs an inspection signal such as an ultrasonic wave or light toward the receiving unit 130, the receiving unit 130 outputs an OFF signal when receiving the inspection signal from the transmitting unit 128, and outputs an ON signal when the inspection signal is not received. Is output.

Therefore, the side edge of the filter cloth 2 is held by the holder 126.
The off signal is output from the receiving unit 130 of the first detection sensor 118 while it is not intruding. While the OFF signal is being output, the meandering adjusting roll 106 or the decompression hopper 54 is rotated so that the side edge of the filter cloth 2 moves toward the inside of the holder 126 as described later. . Further, when the side edge of the filter cloth 2 enters the holder 126 as shown by the broken line in FIG. 11 and interrupts the connection between the transmitter 128 and the receiver 130, the receiver 130 of the first detection sensor 118. Outputs an ON signal. In this case, contrary to the case described above, the meandering adjusting roll 106 or the decompression hopper 54 is rotated so that the side end of the filter cloth 2 moves outward from the holder 126.

On the other hand, the second detection sensors 122 and 124 are
Compared to the first detection sensor 118, the filter cloth 2 is arranged far away from the corresponding side edge of the filter cloth 2. Therefore, when an ON signal is output from these second detection sensors 122 and 124, that is, the receiving section thereof, The ON signal indicates that the meandering of the filter cloth 2 is excessive enough to shut down the dehydrator. Next, referring to FIG. 12, the tension adjusting means 132 of the filter cloth 2 is shown. This tension adjusting means 132
Are provided at both ends of the guide roll 8, but FIG. 12 shows only one side thereof.

The guide roll 8 to which the tension adjusting means 132 is applied is rotatable around its roll shaft 134 via bearings (not shown), and the roll shaft 134 is projected from both ends of the guide roll 8. is there. A bolt insertion hole 136 is formed at the projecting end of the roll shaft 134 so as to penetrate in the diameter direction thereof.
A support bolt 138 is pierced through 6 in a horizontal position.
The support bolt 138 is supported by screwing the base end thereof into the support stand 140, and the support stand 140 is fixed to the main frame side of the dehydrator.

A pair of lock nuts 142 and 144 are screwed onto the support bolt 138 at both sides of the roll shaft 134. Lock nut 142 on the support base 140 side
A tension spring 146 formed of a compression coil spring is arranged between the roll spring 134 and the roll shaft 134 so as to surround the support bolt 138.
6 shows the guide roll 8 via the roll shaft 134.
Inside, the filter cloth 2 is urged in a direction opposite to the traveling direction A.

On the other hand, a predetermined gap 148 is secured between the other lot nut 144 and the roll shaft 134, whereby the tension spring 146 causes a predetermined tension on the filter cloth 2 via the guide roll 8. Can be provided, and its tension is set by the lock nut 142,
It can be adjusted by 144. In the case of the tension adjusting means 132 of FIG. 12, the tension spring 146
Can urge the roll shaft 134 via a spring seat (not shown).

On the other hand, FIG. 13 shows the tension adjusting means 132 when the guide roll 8 is rotated integrally with the roll shaft 150. In this case, the roll shaft 15
One end of 0 is attached to a slider 154 via a bearing 152, and the slider 154 is slidable between upper and lower horizontal guide rails 156. In addition,
These guide rails 156 are also fixed to the main frame side of the dehydrator.

A tension bolt 158 is projected from the slider 154 toward the outside of the endless filter cloth 2. The tension bolt 158 extends horizontally and penetrates the bracket 160, and the bracket 160 is fixed to the main frame side of the dehydrator. A pair of lock nuts 162, 164 located on both sides of the bracket 160 are screwed into the tension bolt 158, and the lock nut 1 on the tip side of the tension bolt 158 is screwed.
A tension spring 166 composed of a compression coil spring is arranged between 62 and the bracket 160 so as to surround the tension bolt 158. The tension spring 166 biases the tension bolt 158 toward the side opposite to the guide roll 8 via the lock nut 162.

Also in this case, the other lock nut 164
A predetermined gap 168 is secured between the bracket 160 and the bracket 160, whereby the tension spring 166 is secured.
Can apply a predetermined tension to the filter cloth 2 via the tension bolt 158, the slider 154 and the guide roll 8, and this tension can also be adjusted by the lock nuts 162 and 164.

FIG. 14 shows a drive system for the drive roll 4 and the main transfer drum 12. The drive system includes a common drive motor 170 fixed to the main frame side, and a drive sprocket 172a and a gear 171a are attached to an output shaft of the drive motor 170. On the other hand, a sprocket shaft is rotatably arranged in parallel with the output shaft of the drive motor 170, and the drive sprocket 172b and the gear 171b are also disposed on this sprocket shaft.
Is installed. The gears 171a and 171b are meshed with each other.

A driven sprocket 174 is attached to the roll shaft of the drive roll 4, and a driven sprocket 176 is also attached to the drum shaft of the main transfer drum 12. A drive chain 178 is wound around one drive sprocket 172b and a driven sprocket 174, and the other drive sprocket 172a.
And the driven sprocket 176 between the drive chain 18
It is multiplied by zero.

Therefore, when the drive motor 170 is driven in one direction, the drive roll 4 and the main transfer drum 12 are synchronously rotated in the opposite direction. Here, it goes without saying that the gear ratios of the driven sprockets 174 and 176 are set so that the peripheral speeds of the drive roll 4 and the main transfer drum 12 match. The drive motor 170, as shown in FIG.
2 is electrically connected to the controller 182, and the controller 182 is connected to the first detection sensor 118 and the second detection sensor 118.
In addition to the detection sensors 122 and 124, the solenoid valves 91 and 115 of the first and second cylinders 90 and 114 are also electrically connected. The controller 182 receives the detection signal from the detection sensor and controls the solenoid valves 91 and 115 and the drive motor 170. Therefore, the controller 182 controls the rotating operation of the pressure reducing hopper 54 and the meandering adjusting roll 106 together with the first and second cylinders 90 and 114 and the solenoid valves 91 and 115 for driving the pressure reducing hopper 54 and the meandering adjusting roll 106. It constitutes a control means for performing.

Further, except for the guide roll 8 and the meandering adjusting roll 106, the rolls and drums mentioned above have their roll shafts and drum shafts on the main frame of the dehydrator, that is, on both side plates 1a, 1a shown in FIG. Each is rotatably supported. Next, the operation of the dehydrator will be described below. First, the drive motor 170 rotates the drive roll 4 and the main transfer drum 12 in synchronism with each other, and the filter cloth 2 is running in the running direction A. Further, the rolls and drums other than the drive roll 4 and the main transfer drum 12 are also in a rotating state as the filter cloth 2 runs.

A solid-liquid SL containing a solid component and a liquid component is supplied from the solid-liquid supply section 21 onto the running filter cloth 2. The liquid component in the supplied solid-liquid SL is
Further, the filter cloth 2 is passed through the filter cloth 2 by the vacuum action provided by the vacuum suction section 52 and collected in the vacuum hopper 54. Since the pressure reducing suction port 66 of the pressure reducing hopper 54 is provided with the filter cloth guide roll groups 74, 76, and 78, the filter cloth 2 is not largely bent while receiving the suction force. It runs without stability.

The liquid components collected in the decompression hopper 54 are
It is discharged from the discharge port 64 to the outside of the dehydrator through the discharge pipe 62 and the seal pot 70. On the other hand, the component that does not pass through the filter cloth 2, that is, the non-filtered component, is caused by the traveling of the filter cloth 2 between the first pressing portion of the dehydration section 11, that is, between the sub-transfer drum 18 and the pressing roll 20. It is carried and squeezed, and the liquid components contained therein are squeezed out to form an intermediate cake.

The intermediate cake is transferred to the outer surface of the sub transfer drum 18, and the transferred intermediate cake is scraped off from the sub transfer drum 18 onto the filter cloth 2 by the scraper 15. The intermediate cake scraped off from the sub-transfer drum 18 is then subjected to the second pressing portion of the dehydration section 11,
That is, it is conveyed between the main transfer drum 12 and the pressing drums 14 and 16 and is further pressed, and most of the liquid components contained therein are squeezed to form a complete discharge cake C.
At this time, in the dehydrator of FIG. 1, the drive roll 4 also functions as a pressing roll.

Here, the main transfer drum 12 and the pressing drum 1
The intermediate cake entering between No. 4 and 16 is the sub-transfer drum 18
Since it is obtained by scraping it off, it is in a state of being deposited on the filter cloth 2. That is, in this case, the intermediate cake deposited on the filter cloth 2 has a thickness of 2 to 2 as compared with the layered intermediate cake after passing through the sub-transfer drum 18 and the pressing roll 18.
3 times. Therefore, the intermediate cake having the increased thickness is used together with the filter cloth 2 in the main transfer drum 12 and the pressing roll 1.
When passing between No. 4 and No. 16, the intermediate cake is squeezed more strongly, and the pressure dehydration is efficiently performed.

The discharge cake C is transferred to the outer surface of the main transfer drum 12 and carried, but is scraped off from the main transfer drum 12 by the scraper 13 and discharged to the outside of the dehydrator by the chute 17. Filter cloth 2 that has passed through the drive roll 4
After that, when passing through the water spray nozzle 92, the water is washed from the surface by the washing water sprayed from the water spray nozzle 92, and when passing through the water spray nozzle 94, the water is sprayed from the water spray nozzle 94. The back surface is cleaned with the sprayed cleaning water. In particular, since the filter cloth 2 is sandwiched between the water spray nozzles 94 and the above-described reduced pressure suction box 100 is arranged so as to face each other, the reduced pressure suction box 100 reduces the pressure of the washing water sprayed on the back surface of the filter cloth 2. Suck out by. Therefore, the cleaning water sprayed on the back surface of the filter cloth 2 is discharged while fluffing the fine napped layer on the surface of the filter cloth 2, and the filter cloth 2 can be cleaned more efficiently.

When the filter cloth 2 is washed, the filter cloth 2 is supported by the filter cloth receivers 96 and 102.
Does not bend, twist, or vibrate. Then, the washed filter cloth 2 is sent to the solid-liquid supply section 21 again, and is repeatedly used for dehydrating the solid-liquid SL.

In the case of the dehydrator of the present invention, the non-filtered components on the filter cloth 2 in the dehydrating section 11 are between the sub-transfer drum 8 and the pressing roll 20 and between the main transfer drum 12 and the pressing rolls 14 and 16. Since the liquid components contained therein are successively squeezed out in two stages between and,
The water content of can be significantly reduced. As described above, when the non-filtered components on the filter cloth 2 are dehydrated in two stages, the running resistance of the filter cloth 2 increases, and the stable running of the filter cloth 2 cannot be ensured only by the rotational driving by the drive roll 4. There is a risk. That is, a slip may occur in the rotation of the drive roll 4 with respect to the filter cloth 2, and the filter cloth 2 may not be delivered from the drive roll 4 and the main transfer drum 12.

In this respect, in the case of the dehydrator of the present invention, since the main transfer drum 12 is rotated in synchronization with the drive roll 4, the rotation of the main transfer drum 12 and the drive roll 4 ensures that the filter cloth 2 is secured. Can be driven to. As a result, even if the solid component is contained in a large amount in the non-filtered component, the non-filtered component can be dehydrated stably, and the processing capacity thereof can be improved.

Since the filter cloth 2 is simply wound around each roll and drum, the structure of the filter cloth 2 is very simple. In this regard, in the conventional case, the filter cloth 2
A rubber belt having a large number of feed holes is sewn on both side ends of the roller, while feed pins for fixing the meandering of the filter cloth 2 are engaged with the feed holes of both ends of the rear guide roll. Although provided, such a meandering correction mechanism for the filter cloth 2 can be omitted in the dehydrator of the present invention.

Therefore, special sewing for sewing the rubber belts on both sides of the filter cloth 2 is not required, and the treatment on both side ends of the filter cloth 2 is sufficient to prevent loosening of the both side ends. The manufacture of the cloth 2 becomes very simple, and its cost can be reduced significantly. When the rubber belts are attached to both ends of the filter cloth 2, the thickness of the filter cloth 2 and the rubber belt greatly differ. Therefore, in order to absorb this difference and obtain a desired squeezing effect, in the conventional case, a step is provided at both ends of the drive roll 4 and the transfer drums 12 and 18.
In the case of the present invention, the drive roll 4 and the transfer drum 1
There is no need to provide a step on the rolls 2 and 18, and the structure of the roll 4 and the drums 12 and 18 is also simplified.

When both ends of the filter cloth 2 are constrained by the feed pins of the rear guide rolls via the rubber belts, wrinkles are likely to occur in the filter cloth 2. Since the filter cloth 2 is not restricted, the filter cloth 2 can freely extend in the width direction thereof and can prevent the generation of wrinkles. Furthermore, since the filter cloth 2 is detachably connected at its both edges by the hook-and-loop fasteners 28 to be endless, the connection by the hook-and-loop fasteners 28 is released when the filter cloth 2 is replaced with a new one. if,
Not only can the filter cloth 2 be easily removed from each roll or the transfer drum, but a new filter cloth 2 can also be easily wound around.

Therefore, in the case of the dehydrator of the present invention, except for the guide roll 8 and the meandering adjustment roll 106, the other rolls and the transfer drums 12 and 18 are supported on the pair of side plates 1a and 1a of the main frame by both ends. You can
The structure of the main frame itself is also simple. Tension adjusting means 132 shown in FIG. 12 or FIG.
Since the tension spring 146 or 166 constantly urges the guide roll 8, the urging causes the guide roll 8 to move when the filter cloth 2 extends in the traveling direction by following this extension. It will be, filter cloth 2
It is possible to always give proper tension to. Thus, if the filter cloth 2 can always be tensioned regardless of the elongation of the filter cloth 2, it is possible to effectively prevent the meandering of the filter cloth 2 while the filter cloth 2 is running.

Further, the tension adjusting means 132 determines the amount of movement of the guide roll 8, that is, the tension force of the tension spring 146 or 166, by the gap 148 between the roll shaft 134 of the guide roll 8 and the lock nut 144, or , Bracket 160 and lock nut 1
It can be known from the size of the gap 168 between the two. Therefore, if the gaps 148, 168 are reduced below a predetermined distance, the lock nuts 142 or 16
By turning 2, the tension force by the tension spring 146 or 166 can be readjusted.

Further, if a sensor for detecting the size of the gap 148 or 168 is provided, the tension of the filter cloth 2 can be quantified and obtained, and the lock nuts 142, By controlling the rotation of 162, the tension of the filter cloth 2 can be automatically adjusted. If the filter cloth 2 can always be tensioned as described above, the meandering of the filter cloth 2 can be effectively prevented, but for some reason, the filter cloth 2 can be prevented.
Even when the filter cloth 2 meanders, the dehydrator of the present invention can eliminate the meandering of the filter cloth 2 and maintain its stable running.

To explain this point in detail, since the first detection sensor 118 is provided near the guide roll 8 on one side of the filter cloth 2 as described above, meandering occurs in the filter cloth 2. Then, from the first detection sensor 118,
A detection signal indicating the meandering of the filter cloth 2 is output, and this detection signal is supplied to the controller 182 described above. Specifically, when the filter cloth 2 meanders to the left in FIG. 2, the left end of the filter cloth 2 enters into the holder 126 of the first detection sensor 118, and the transmitter 128 and the receiver 130 of the first detection sensor 118 enter. Cut off the space. Therefore, the receiving unit 13 of the first detection sensor 118
From 0, an ON signal indicating the meandering of the filter cloth 2 is output toward the controller 182.

When the controller 182 receives the ON signal, the controller 182 controls the switching of the solenoid valve 115 and contracts the piston rod 116 of the second cylinder 114 by a predetermined amount. Therefore, as shown in FIG. 16, the meandering adjustment roll 106 rotates about the vertical pin 112 from the position indicated by the solid line to the position indicated by the alternate long and short dash line. As a result, the filter cloth 2 meandering to the left as indicated by the one-dot chain line changes its traveling direction to the right when passing through the meandering adjusting roll 106, and returns to the regular traveling route indicated by the solid line. To do. The second cylinder 114 is omitted in FIG.

On the other hand, when the filter cloth 2 meanders to the right, an off signal is output from the first detection sensor 118 to the controller 182, and the controller 182 receives the off signal and causes the solenoid valve 115 to operate. Switching control is performed in the same manner. In this case, the piston rod 116 of the second cylinder 114 is extended by a predetermined amount, and the meandering adjusting roll 106
Is rotated from the position indicated by the solid line to the position indicated by the chain double-dashed line. As a result, the filter cloth 2 meandering to the right as shown by the chain double-dashed line passes through the meandering adjusting roll 106, so that its traveling direction is changed to the left and returns to the regular traveling route shown by the solid line. To do.

As described above, even if the filter cloth 2 travels in a meandering direction, the direction of the meandering is determined by one first detection sensor 118.
And the rotation of the meandering adjusting roll 106 is controlled based on the detection signal from the first detection sensor 118, the meandering of the filter cloth 2 can be kept within a certain range and the traveling thereof can be stabilized. . The first detection sensor 118 is not in contact with the filter cloth 2 and can detect the meandering thereof,
The side edge of the filter cloth 2 is not damaged by the contact with the sensor 118.

The meandering adjustment of the filter cloth 2 by the turning operation of the meandering adjusting roll 106 is suitable when the filter cloth 2 has a strong rigidity, but when the filter cloth 2 having a weak rigidity is used. Instead of rotating the meandering adjustment roll 106,
By rotating the decompression hopper 54, it is possible to prevent the filter cloth 2 from meandering. In this case, when the meandering occurs in the filter cloth 2 as shown by the arrow in FIG. 17 and the ON signal, that is, the detection signal is received from the first detection sensor 118, the controller 1
Reference numeral 82 denotes a switching control of the solenoid valve 91 to control the first cylinder 9
Expand and contract the 0 piston rod. Due to this expansion and contraction, the decompression hopper 54 rotates about the pivot 86 as shown by the chain double-dashed line in FIG. As a result, when the filter cloth 2 passes through the filter cloth guide roll groups 74, 76, 78 of the decompression hopper 54, the traveling direction of the filter cloth 2 is changed in the same manner as the case of the meandering adjusting roll 106 described above. Return to the regular travel route.

When controlling the meandering of the filter cloth 2,
The turning operation of the meandering adjusting roll 106 and the turning operation of the decompression hopper 54 may be simultaneously performed. As is clear from the above description, since the filter cloth 2 is allowed to meander, the filter cloth 2 is running around with both side ends thereof being unrestrained. That is, since the running guides for guiding the both ends of the filter cloth 2 are not required, the wear of the filter cloth 2 can be reduced and the service life thereof can be extended.

Regardless of the turning operation of the meandering adjusting roll 106 and the rotating operation of the decompression hopper 54, the meandering of the filter cloth 2 becomes large, and the meandering is caused by the second detection sensors 122, 12.
When the detection signal is supplied to the controller 182, the controller 182 generates an emergency stop signal to stop the driving of the drive motor 170, that is, the running of the filter cloth 2.

The present invention is not limited to the above-mentioned embodiment, but various modifications can be made. For example, the first detection sensors may be arranged on both sides of the filter cloth 2, respectively. In this case, the meandering adjusting roll 106 or the decompression hopper 5 is activated by the ON signals from the pair of first detection sensors.
The rotation operation 4 is repeated. The second detection sensors 122 and 124 are not necessarily limited to the non-contact type, and may be those that come into contact with the filter cloth 2 and output the detection signals thereof.

Further, the driving force for rotating the meandering adjusting roll 106 or the pressure reducing hopper 54 based on the ON / OFF signal from the first detection sensor 118 is limited to the above-mentioned double-acting pneumatic or hydraulic cylinder. Instead, it is also possible to give from an electric motor through a rack and pinion.
The dehydration section 11 may be one that pressurizes and dehydrates the non-filtered component in three or more stages.
8 may also be driven to rotate in synchronization with the drive roll 4 and the main transfer drum 12.

The solid-liquid separation device of the present invention can be used for various purposes. For example, it can be used for separating a solid component and a liquid component contained in lake water or river water. Further, like surplus sludge by-produced from the activated sludge treatment device, so-called suspended sludge, discharged from the biofilm treatment device, so-called fixed system sludge, sludge produced by wastewater treatment, scum, flocs, Wash water,
It can be used when sludge or the like is filtered, concentrated, or dehydrated. Specifically, for example, sludge generated by sewage treatment, surplus sludge generated from a septic tank, sludge generated from a night soil treatment plant, scum generated from a pressurized flotation operation, flocs and flocculation flocs generated by the treatment of industrial wastewater, It can be used to separate a solid component and a liquid component contained in backwash water of various filters such as a sand filter. It can also be used for solid-liquid separation in various manufacturing industries such as paper pulp manufacturing industry, food manufacturing industry, brewing industry, brewing industry such as miso, and recovery of valuables in chemical processes.

[0070]

As described above, according to the solid-liquid separation device of the present invention, meandering of the filter cloth is detected by the detection sensor while the filter cloth is traveling around, and based on the detection signal from the detection sensor. Since the means for adjusting the running direction of the filter cloth is provided, even if the filter cloth meanders, the meandering is automatically corrected by the adjusting means, and the running of the filter cloth can be stabilized. Since the meandering of the filter cloth is allowed,
It does not require running guides to guide both sides of the filter cloth,
It is possible to prevent wear on both ends of the filter cloth and prolong its service life. The adjusting means can be easily realized only by providing the meandering adjusting roll for guiding the traveling of the filter cloth and the hopper having the guide roll so as to be rotatable.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a solid-liquid separation device applied to a filter cloth traveling type dehydrator.

FIG. 2 is a plan view of the solid-liquid separation device of FIG.

FIG. 3 is a cross-sectional view showing a connecting portion at both edges of the filter cloth.

FIG. 4 is a plan view showing a part of the filter cloth.

FIG. 5 is a perspective view showing a solid-liquid supply section.

FIG. 6 is a plan view of a decompression hopper.

FIG. 7 is a schematic perspective view showing a part of the decompression hopper.

FIG. 8 is a diagram showing a filter cloth running on a vacuum hopper.

FIG. 9 is a perspective view showing a meandering adjusting roll.

FIG. 10 is a view showing a winding angle of the filter cloth with respect to the meandering adjusting roll.

FIG. 11 is a perspective view showing a first detection sensor.

FIG. 12 is a plan view showing an example of tension adjusting means of the filter cloth.

FIG. 13 is a side view showing another example of the tension adjusting means.

FIG. 14 is a diagram showing a drive system for a drive roll and a main transfer drum.

FIG. 15 is a diagram showing a control circuit for controlling the rotation operation of the meandering adjusting roll and the rotation operation of the decompression hopper.

FIG. 16 is a view showing the meandering adjustment of the filter cloth by the meandering adjusting roll.

FIG. 17 is a diagram showing a rotating operation of the decompression hopper.

[Explanation of symbols]

 1a Side plate 2 Filter cloth 4 Drive roll 8 and 10 Guide roll 11 Dehydration section 12 Main transfer drum (second pressure part) 13,15 Scraper 14,16,20 Squeeze roll 17 Chute 18 Sub transfer drum (first pressure part) ) 19,23 Pressing spring 21 Solid-liquid supply section 22 Substrate 24 Standing hair 26 Filter layer 28 Face fastener 30 Cloth piece 32 Solid-liquid level adjusting tank 36 Discharge pipe 38 Solid-liquid supply frame 40 Seal 50 Solid-liquid introduction pipe 52 Decompression suction section 54 Decompression hopper 56 Intake pipe 58 Suction source 60 Intake port 62 Discharge pipe 64 Discharge port 66 Decompression suction port 71 Punching metal 70 Seal pot 72 Suction frame 74, 76, 78 Filter cloth guide roll group 72a, 76a, 78a Filter cloth guide roll 80 common shaft 82 auxiliary frame 84 bracket 86 pivot 87 piston rod 8 Arm 90 First cylinder 91,115 Solenoid valve 92,94 Water spray nozzle 93 Pressure source 96,100 Filter cloth receiver 104 Recovery hopper 106 Meandering adjusting roll 108 Roll shaft 110 Mounting ring 112 Vertical pin 114 Second cylinder 116 Piston rod 118th 1 detection sensor 122,124 second detection sensor 126 holder 128 transmission part 130 reception part 132 tension adjusting means 134,150 roll shaft 136 bolt insertion hole 138 support bolt 140 support base 142,144,162,164 lock nut 146,166 tension Spring 148,168 Gap 152 Bearing 154 Slider 156 Guide rail 158 Tension bolt 160 Bracket 170 Drive motor 171a, 171b Gear 172a, 172b Dynamic sprocket 174, 176, 178, 180, driven sprocket drive chain 182 controller

Claims (3)

[Claims] 1. A solid-liquid separation device comprising an endless filter cloth provided so as to be capable of traveling in one direction on a fixed track, and a solid-liquid supply section for supplying a solid-liquid to the surface of the filter cloth. A solid-liquid separation device comprising a detection sensor for detecting meandering of the cloth, and means for adjusting the traveling direction of the filter cloth based on a detection signal from the detection sensor. 2. The adjusting means includes a meandering adjusting roll that guides the travel of the filter cloth and is rotatable about one end in the front-rear direction of the filter cloth.
Solid-liquid separator. 3. The adjusting device further comprising: a hopper that collects a liquid component in the solid liquid that has passed through the filter cloth, and a guide roll that is arranged in an opening on an upper surface of the hopper so as to be aligned in the traveling direction of the filter cloth. The solid-liquid separation device according to claim 1, wherein the means includes means for rotatably supporting the hopper in a plane parallel to the traveling direction of the filter cloth.