JP3369866B2 - Method for controlling the amount of scooped sediment in a dewatering and discharging device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering / discharging apparatus using forced dewatering by vacuum suction after scooping and draining. And a method for controlling the amount of scooping. 2. Description of the Related Art Classifiers of bucket type, spiral type, rotary type and the like are conventionally known. However, all of them only separate sediment such as sand from water, and the state of drainage is poor and muddy state. It was difficult to handle post-processing. In view of this, the inventor of the present invention has developed a dehydration / discharge device in an earlier application in which a sediment is scooped up and drained by a scooping bucket provided at a tip portion provided radially, and then forcibly dewatered by vacuum suction. [0003] However, if the amount of sediment in the scooping bucket is small, the drainage net cannot be closed by the sediment, so that the vacuum suction from below becomes weak. However, it is conceivable that there is a problem that uniform dehydration does not occur because suction dehydration of the upper precipitate cannot be performed. [0004] Therefore, the present invention aims at equalizing the amount of sediment scooping by controlling the rotation of the scooping bucket, thereby making it possible to uniformly and smoothly perform vacuum suction and perform forced dewatering. It is intended to obtain a precipitate such as sand which can be formed well and has a low water content. According to the present invention, a scooping bucket having an opening at the top and provided with a drainage net inside is mounted on the tip of a mounting arm fixed to a central rotary mounting body. The scooping bucket scoops the sediment in the settling tank to which the undiluted solution is supplied, and the lower part of the scooping bucket is suctioned under a negative pressure in a position range in which the scooping bucket comes out of the settling tank and is rotationally displaced upward from substantially horizontal to vertical. In the dewatering and discharging device for forcibly dewatering the scooped-up sediment, the negative pressure gauge provided in the negative pressure suction device and the motor for rotating the rotary mounting body are connected, and the negative pressure gauge is set to a weak negative pressure from a predetermined normal negative pressure range. If this happens, reduce the number of rotations of the motor to slow down the rotation of the scooping bucket, and if the negative pressure gauge reaches a stronger negative pressure than the predetermined normal negative pressure range, increase the number of rotations of the motor to increase the scooping bucket. Times This is a method for controlling the amount of sediment scooped in a sediment dewatering / discharging device, characterized by speeding up rotation. DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the method of the present invention will be described below based on an example of an apparatus shown in the drawings. First, the apparatus shown in FIGS. 1 to 4 will be described. The apparatus is disposed in the sedimentation tank 1, and a slurry containing sand is continuously fed from a supply port 11 thereof. Reference numeral 2 denotes a rotating cylinder supported at the upper end of the sedimentation tank 1, which is fixed to a rotating shaft 20 which is connected and rotated by a motor 21 provided at the rear, and which rotates vertically. A disk-shaped rotary mounting body 22 is fixed to the center of the rotary cylinder 2 in the axial direction, and the drainage tank 3 is connected to the distal end of the rotating mounting body 22 via a plurality of mounting arms 23 extending in the radial direction. And a scooping bucket 4 on the front of the drainage tank 3, respectively.
And 16 are provided radially. That is, as shown in FIG. 3, the drainage tank 3 is fixed to the end of the mounting arm 23, and the tip of the drainage tank 3 is fixed to the front of the lower part of the scooping bucket 4 and the scooping bucket 4 is fixed from the side. Seen protruding forward. The scooping bucket 4 has an open upper surface, is provided with a drainage net 41 inside, and is vertically divided. The upper part is a sediment placement part, and the lower part from the drainage net 41 is a dropping part of drained separated water. . The tip of the scooping bucket 4 is inclined so that scooping is easy. The drain tank 3 has a drain hole 3 at the lower rear end.
1 is provided, and connected to a discharge port 42 below the drainage net of the scooping bucket 4 to receive the separated water that has passed through the drainage net 41 and return to the sedimentation tank 1 from the drain hole 31 and drain. In addition, the drainage tank 3 is fixed to the scooping bucket 4 in a state where it is slightly lowered and inclined so that the separated water that has passed through the drainage net 41 can easily pass therethrough. Reference numeral 5 denotes a cover opening / closing member for the drain hole 31. A seesaw material 51 is attached to the projecting shaft 231 of the mounting arm 23.
And a weight 53 heavier than the lid 52 is attached to the other end of the seesaw member 51. Reference numeral 6 denotes a suction means for suctioning the inside of the drainage tank 3 within a range where each scooping bucket 4 is rotationally displaced upward from a substantially horizontal state to a vertical state. That is, as shown in FIG. 4, a suction pipe 62 connected to a suction side of a blower 61 for performing a vacuum suction action is connected to a rotating shaft 20.
Is connected to the fixed cylinder 63 in which the
The conductive groove 640 of the suction plate 64 which is fixed and fixed to the suction plate 3 is in a vacuum state. The conduction groove 640 is provided in the suction plate 64 at a position from a substantially horizontal state to a vertical state, and the conduction groove 640 is opened in the front end face. A control plate 25 is fixed to the rear end of the rotary cylinder 2, and through holes 250 which are equally spaced in the circumferential direction penetrate the control plate 25 and are in contact with the suction plate 64. Reference numeral 33 denotes a suction hose, which is connected to each of the through holes 250 on the front surface of the control plate 25 and is connected to the rear end of the drainage tank 3 by opening. Reference numeral 7 denotes a discharge chute provided at the upper center, which is located below the scooping bucket 21 which rises and turns upside down. Next, the operation of this embodiment will be described. First, when sand-containing slurry is sent from the supply port 11 to the sedimentation tank 1, the sand 9 precipitates. Then, the rotating cylinder 2 is slowly rotated by the drive of the motor 21 and enters the sedimentation tank as shown in FIGS. 6 and 7.
As shown in FIG. 1, each scooping bucket 4 scoops the sand 9 settled to the bottom, and as shown in FIG.
And is drained from the drain hole 31 of the drain tank 3. At this time, the lid 52 faces the drain hole 3 with the weight 53 facing downward.
1, the lid 52 is opened and drained by heavy drainage pressure. Since the conduction groove 640 of the suction plate 64, which is electrically connected to the suction pipe 62 by the operation of the blower 61, is always in a vacuum state, the scooping bucket 2 extends from substantially horizontal to upward in an arrow range 8 shown in FIG. Within the range of rotational displacement,
The through hole 250 of the control plate 25 communicates with the conduction groove 64 by the suction hose 33. That is, the control plate 25 rotates integrally with the rotary cylinder 2 while being in contact with the suction plate 64, and the through hole 250 communicates with the conduction groove 64. As a result, the inside of the drainage tank 3 is sucked, and the inside of the drainage tank 3 is in a negative pressure state, so that air from the outside passes between the sands 9 held by the scooping bucket 4 and water remaining between the sands 9 Is wiped and guided to the drainage tank 3 to forcibly dehydrate the sand 9. At this time, as shown in FIG. 9, the rotational displacement range of the arrow range 8 in FIG. 1, which is the suction action range, is reduced by the gravity of the weight 53 against the reduced drainage pressure due to the reduced drainage pressure.
2 is moved upward, and the lid 52 strongly closes the drain hole 31 of the drain tank 3 due to the suction force, so that no outside air enters and good suction dehydration can be achieved. Note that the separated water dehydrated by the vacuum suction accumulates in the drainage tank 3. When the forced dehydration by the vacuum suction is completed and the reversal is started, as shown in FIG. 2, the sand 9 falls on the discharge chute 7, and at this time, the water remaining in the drainage tank 3 is
Since the drain hole 31 is closed by the lid 52, it does not drop into the sedimentation tank 1. However, the lid 52 may be opened and dropped by water pressure, and does not drop into the discharge chute 7. As described above, according to the present embodiment, dewatering is performed by draining and suctioning air to obtain sand 9 without stickiness. Further, the water drained from the scooping bucket 4 is immediately returned to the sedimentation tank 1 from the drainage tank 3 and drained, so that the drainage tank can be lightened and the rotational power can be reduced. As a characteristic method in this example,
When the negative pressure gauge 65 of the vacuum tank 60 of the suction means 6 falls below the normal negative pressure range, that is, when the vacuum suction becomes a negative pressure weaker than the normal negative pressure, the control circuit reduces the rotation speed of the motor 21. Then, the rotation of the scooping bucket 4 is slowed down by slowly rotating the rotary mounting body 22. The reason why the vacuum suction is weak negative pressure suction is that when the amount of the sand 9 scooped up by the scooping bucket 4 is small, the vacuum suction is not performed properly because the sand 9 does not block the drainage net 41. It is. Therefore, by slowing down the rotation of the scooping bucket 4, the amount of the sand 9 scooped up by the scooping bucket 4 increases and the drainage net 41 is closed, so that the vacuum suction is properly performed at a normal negative pressure. Become. In FIG. 10, when the pressure drops below a predetermined range, the PS2 switch is set to O.
It becomes N and the motor 21 rotates at low speed. When the negative pressure gauge 65 of the vacuum tank 60 of the suction means 6 is out of the normal negative pressure range, that is, when the vacuum suction becomes a negative pressure stronger than the normal negative pressure, the motor 21 is controlled by the control circuit. The rotation of the scooping bucket 4 is accelerated by increasing the number of rotations and rotating the rotation mounting body 22 quickly. The reason why the vacuum suction becomes a strong negative pressure suction is that when the amount of the sand 9 scooped up by the scooping bucket 4 is too large, the amount of air passing between the sand 9 from the atmosphere decreases, and the sand deposited on the top 9 cannot be forcibly dehydrated, resulting in uneven dehydration. Thus, by increasing the rotation of the scooping bucket 4, the amount of the sand 9 scooped up by the scooping bucket 4 is reduced, so that the vacuum suction at a normal negative pressure is properly performed. In FIG. 10, when the pressure drops below a predetermined range, the PS3 switch is turned on and the motor 21 rotates at high speed. That is, forced dehydration by good vacuum suction is
It has been found through experiments that it is related to the scooping amount of the sand 9 in the scooping bucket 4.
Blocking 1 was optimal. The method of the present invention is not limited to the above example. For example, irrespective of the configuration of the negative pressure suction means, a connecting means between the negative pressure gauge and a motor for rotating the rotary mounting body is also appropriate. When the negative pressure gauge becomes a weak negative pressure from the predetermined normal negative pressure range, the rotation speed of the scooping bucket is reduced by reducing the rotation speed of the motor, and the negative pressure gauge is set to a stronger negative pressure than the predetermined normal negative pressure range. If this happens, control means for increasing the number of rotations of the motor to speed up the rotation of the scooping bucket is also optional. Further, the type of the motor is not limited, and a hydraulic motor may be used. In addition, the configuration of the rotating mount, the scooping bucket, the drainage net, and the like are also appropriate. According to the method of the present invention, by controlling the rotation of the motor for rotating the scooping bucket, the amount of sediment scooped by the scooping bucket can be appropriately adjusted, and the forced dewatering by vacuum suction can always be satisfactorily performed. In addition, the effect of obtaining a precipitate having a low water content is great, and the equipment can be installed at a low cost with a simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view of a dewatering and discharging device used in the present invention. FIG. 2 is a side view partially cut away. FIG. 3 is an enlarged perspective view of the scooping bucket and a drainage tank section. FIG. 4 is a partially cutaway perspective view of the suction means. FIG. 5 is a partially cutaway front view of the lid opening / closing means. FIG. 6 is a partially cutaway front view immediately before a scooping bucket enters a sedimentation tank. FIG. 7 is a partially cutaway front view showing a state where a scooping bucket scoops sediment. FIG. 8 is a partially cutaway front view showing a state in which a scooping bucket is out of the water surface of a sedimentation tank. FIG. 9 is a partially cutaway front view showing a state where forced dewatering is performed by vacuum suction. FIG. 10 is a sequence circuit of a control circuit according to one embodiment of the present invention. [Description of Signs] 1 Settling tank 11 Supply port 2 Rotating cylinder 21 Motor 22 Rotary mounting body 3 Drain tank 4 Scooping bucket 41 Drain net 6 Suction means 60 Vacuum tank 61 Blower 65 Negative pressure gauge 7 Discharge chute 9 Sand

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 21/00-21/34

Claims (1)

(1) A scooping bucket (4) having an open upper surface and a drainage net (41) provided therein, and a scooping bucket (4) fixed to a central rotating mount (22). Attached to the tip of 23), the scooping bucket (4) scoops the sediment in the sedimentation tank where the undiluted solution is supplied, and the scooping bucket comes out of the sedimentation tank and rotates upwardly from the horizontal position to the vertical position. In a dewatering / discharging device for negatively sucking the lower part of the scooping bucket in the range and forcibly dewatering the sediment which has been scooped up, a motor (21) for rotating a negative pressure gauge (65) and a rotary mounting body (22) provided in the negative pressure suction device. If the negative pressure gauge (65) becomes weaker than a predetermined normal negative pressure range, the rotation speed of the motor (21) is reduced and the rotation of the scooping bucket (4) is reduced. Along with
When the negative pressure gauge (65) becomes higher than the predetermined normal negative pressure range, the number of rotations of the motor (21) is increased to speed up the rotation of the scooping bucket (4). A method for controlling the amount of scooping of sediment in a dehydration discharge device.