JPH06336748A - Sludge dredger - Google Patents

Abstract

PURPOSE:To enable the treatment of sludge by absorbing sludge with a spiral screw to make sqeeze pumping, at the same time, centrifugalizing it to dewater, and conveying it to the ground in a moistureless state. CONSTITUTION:Sludge H on the sea bed S is raked backward with a spiral screw 12, and the squeeze pumping of sludge is made to a first dewatering tank 14 through a drain pipe 47 with a cylinder device 13 of a pair of pistons. Then, after the sludge H is centrifugalized and dewatered with the dewatering tank 14, it is moved to a second dewatering tank 15 through a pipe 48 and, at the same time, dewatered moisture is returned to the sea bed with a return pipe 58. After that, the sludge H is further dewatered with the dewatering tank 15 and is moved to the ground through a pipe 49 and a drain pipe 4. According to the constitution, water content of sludge conveyed to the ground is reduced, so that a giant settling basin is not required, disposal of sludge can be easily made, sludge is not so much raised from the sea bed in comparison with sludge absorbed with a pump, and dredge can be made without polluting the sea.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sledged dredger capable of favorably treating sludge on the seabed.

[0002]

2. Description of the Related Art In the conventional sludge dredger,
Since the sludge on the sea floor is sucked up by a pump and sent to the ground via pipes, etc., a huge sedimentation basin is required on the ground, and large-scale equipment is required for the sludge sedimentation process on the ground. However, there is a problem that sludge treatment is difficult and the conventional method often winds up the sludge on the seabed, resulting in pollution of the sea, and there is a problem of marine pollution.

[0003]

The present invention has been devised in view of the above-mentioned problems of the prior art, and does not require a large-scale sedimentation pond or the like on the ground, and sludge on the seabed is less likely to be wound up. The purpose of the present invention is not to provide a dredger, and its gist is to use a spiral screw for scraping sludge on the seabed, a cylinder device for sucking up and pumping the sludge collected by the screw by alternating movement of a pair of pistons, and the cylinder device. It is provided with a dehydration tank for dehydrating the sludge that has been pressure-fed by centrifugation.

[0004]

[Function] The sludge on the seabed is scraped by the spiral screw, the sludge collected is alternately moved by a pair of pistons, sucked up and pumped, and the sludge is dehydrated by centrifugal separation in the middle of a state of low water content. Sludge can be sent to the ground, sludge disposal on the ground becomes easy, and a large-scale sedimentation pond or the like is not required.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the sledged dredger.
FIG. 2 is a plan configuration diagram of the sledd dredger. The hull 2 of the sledd dredger 1 is formed as a flat plate by connecting a large number of block plates 2a, 2a, 2a, and a pair of hanging rods 3, 3 are provided at the rear of the hull 2, By inserting the hanging rods 3 into the seabed S, the hull 2 can be turned and moved forward. A discharge pipe 4 is connected to the rear portion of the hull 2, and the discharge pipe 4 is Sea level W
It is placed on the floating bodies 5, 5, 5 floated on the ground and extended to the ground. Further, a driver's cab 6 and a winch 7 are installed on the hull 2, and the winches 7 can wind up the wires 8 and 8.
The wire 8 is connected to a rotating frame body 10 that is vertically movable via a hinge portion 11 on the front portion of the hull 2, and the rotating frame body 10 is sunk to the seabed S side via the wire 8. Has become.

A spiral screw 12 is attached to the tip of the rotary frame 10, and the rotary frame 10 has a cylinder device 13 in communication with the spiral screw 12.
Is provided on the upper part of the rotating frame body 10.
A dewatering tank 14 is provided, and a second dewatering tank 15 connected via a pipe 48 of the first dewatering tank 14 is installed on the hull 2. A pipe 49 is connected to the outlet side of the second dehydration tank 15, and the pipe 49 is connected to the discharge pipe 4.

An enlarged side view of the cylinder device 13 and the spiral screw 12 is shown in FIG. 3 and further explained. The spiral screw 12 is attached to a screw shaft 16 rotated by a hydraulic motor 17 to rotate the screw shaft 16. The sludge H on the seabed S is scraped backward by the rotation of the spiral screw 12. A rubber tube 18 is connected to the rear portion of the spiral screw 12, and the rubber tube 18 is further communicated with a dust collecting chamber 20. A dust removing blade 21 is rotatably provided in the dust removing chamber 20.
1 is attached to a shaft 22 rotated by a motor 23. Further, a lid 24 is provided on the upper part of the dust removing chamber 20 so as to be openable and closable, and the lid 24 is opened to periodically remove dust in the dust removing chamber 20 and dust adhering to the dust removing blades 21. Is configured to be able to. 4 shows a plan view of the dust removing blade 21 provided in the dust removing chamber 20.

The spiral screw 12 is a seabed S.
The angle is adjusted beforehand by the angle 19 so that the angle of the spiral screw 12 is changed by changing the length of the angle 19 through a large number of adjusting holes formed in the angle 19. It can be changed.

At the rear of the dust collecting chamber 20, the cylinder device 13 is provided so as to communicate with each other. The cylinder device 13 is provided with a pair of cylinders as shown in the plan view of FIG. The cylinder 26 and the second cylinder 27 are arranged in parallel, and each cylinder 26, 27
The front end portion of is in communication with the lower valve chamber 34, and in the lower valve chamber 34, a rotary valve 36 is rotatably provided via a shaft 35. The first cylinder 26 is provided with a piston 30 at the front end of a rod 29 which is moved by the hydraulic pressure supplied to the hydraulic chamber 28, while the second cylinder 27 is also provided with a hydraulic chamber 31, a rod 32 and a piston 33. It has a first cylinder 26 and a second cylinder 27.
Are configured to move alternately, and when the piston 30 of the first cylinder 26 is located on the front end side, the second cylinder 26
The piston 33 of the cylinder 27 is configured so as to move to the rear side.

A rotary valve 36 provided in the lower valve chamber 34.
Is equipped with two valves 36a and 36b, and the lower valve chamber 34
At the front end of the valve seat pipe 3 having an inclined valve seat 37a
7 and a valve seat tube 38 are provided in a protruding shape so as to communicate with the dust collecting chamber 20, and the valve element 36a of the rotary valve 36 abuts on the tilted valve seat 37a of the valve seat tube 37 so that the valve seat tube 37 Can be opened and closed,
Further, the valve element 36b of the rotary valve 36 contacts the valve seat tube 38,
The valve seat tube 38 can be opened and closed.

That is, when the piston 30 of the first cylinder 26 is moved to the front end side as shown in FIG. 5, the valve element 36b of the rotary valve 36 abuts on the valve seat pipe 38, and the valve seat pipe 38 is opened. Close. In this state, the valve seat tube 37 on the other side is opened, and the sludge H collected by the spiral screw 12 is sucked into the lower valve chamber 34 via the dust collecting chamber 20. Conversely, the piston 3 of the second cylinder 27
3 moves forward, the rotary valve 36 rotates, and the valve element 36a
When the valve seat pipe 37 is closed, the valve seat pipe 38 is opened, and the slidable H is sucked into the lower valve chamber 34 through the valve seat pipe 38 by the movement of the piston 30 of the first cylinder 26 to the rear side.

As shown in FIG. 3, an upper valve chamber 39 is formed above the lower valve chamber 34 so as to communicate with each other.
As shown in a plan view in FIG. 6, reference numeral 6 indicates a rotary valve 4 inside.
3 and an on-off valve 45 are provided. By the pushing force of the pistons 30, 33 of either cylinder 26, 27,
The sludge pushed out from the lower valve chamber 34 enters the upper valve chamber 39 through the valve seat pipe 40 or 41, but the rotary valve 43 opens and closes the valve seat pipe 40 or 41. With the valve seat pipes 37, 38 on one side open, the valve seat pipes 40, 41 on either side are opened, and sludge continuously flows into the upper valve chamber 39, and the valve element 43a of the rotary valve 43 is opened. , 43b opens and closes the valve seat pipes 40, 41 on either side of the rotary valve 36.
Performs the same action as. Further, the partition plate 4 is provided in the upper valve chamber 39.
6 and 46 are provided, and an on-off valve 45 that opens and closes with the shaft 44 as a fulcrum to open and close the partition plates 46 and 46 is provided. The on-off valve 45 prevents backflow of the sludge H. It is a thing.

In this way, either side of the cylinder 26
Alternatively, the sludge H pushed out of the 27 enters the upper valve chamber 39 from the lower valve chamber 34, passes through the open / close valve 45, and is discharged into the discharge pipe 47.
The discharge pipe 47 is communicated with the first dehydration tank 14, and the sludge is pressure-fed to the first dehydration tank 14.

Next, a configuration diagram of the first dehydration tank 14 is shown in FIG. The first dehydration tank 14 is formed in a cylindrical shape by an outer peripheral plate 51, and has hollow shaft tubes 50, 5 on both sides at the inner center thereof.
0 is provided, and the discharge pipe 47 is communicated with the lower hollow shaft pipe 50. A rotary cylinder 55 is rotatably connected to the hollow shaft tubes 50, 50 via bearings 52, 52, and an oil seal 53 seals between the bearing 52 and the rotary cylinder 55. A wire mesh is provided inside the rotary cylinder 55, and long holes 56, 56, 56 are formed in the outer circumference of the rotary cylinder 55 at predetermined intervals in the longitudinal direction, and a large number of small holes 57, 57, 57, 57 is formed.

The rotary cylinder 55 is rotated by a pulley 54 provided on the outer periphery of the bearing 52,
The pulley 54 is connected to an external pulley 60 via a belt 61, and the pulley 60 is driven by a motor 59. When the rotary cylinder 55 rotates, the sludge that has flowed into the rotary cylinder 55 through the hollow shaft tube 50 is elongated by the centrifugal force generated by the rotation of the rotary cylinder 55, and the slender holes 56 and the small holes 5 are formed.
The water is blown from 7 to the outside, and the blown-off water flows downward along the lower inclined surface 51a of the outer peripheral plate 51 and passes through the return pipe 58 provided at the lower end of the outer peripheral plate 51. It flows down. The front end portion of the return pipe 58 extends to the upper side of the spiral screw 12, and the removed water is returned to the seabed through the return pipe 58. The sludge dehydrated by the centrifugal separation in the first dehydration tank 14 as described above is further separated from the hollow shaft tube 50 to the pipe 4
8 through the second dehydration tank 15 to the second dehydration tank 15
It is further dehydrated inside, passes through pipe 49, and discharge pipe 4
It is sent from 0 to the ground. The internal structure of the second dehydration tank 15 is substantially the same as the structure of the first dehydration tank 14 of FIG. 7, and the description thereof will be omitted.

As described above, the first and second dehydrating tanks 14,
Since the sludge is dehydrated at 15, the sludge sent to the ground has a low water content, and it does not require a huge sedimentation tank on the ground, and it is possible to treat the sludge in a small sedimentation tank. Become. Further, in the sludge dredger of this example, the sled screw 12 is used to scrape and collect sludge H, which is a cylinder device 13 provided with a pair of cylinders 26 and 27.
Since it is sucked in and pumped by, it is possible to carry out good dredging work without polluting the seabed, as the sludge H is much less rolled up on the seabed S compared with the conventional pump. Is something that can be done.

[0017]

The sled dredger of the present invention comprises a helical screw for scraping sludge on the seabed, a cylinder device for sucking and pumping sludge collected by the screw by alternating movement of a pair of pistons, and a pump for pumping from the cylinder device. By installing a dehydration tank that dehydrates the sludge that has been collected by centrifugation, the sludge collected by the spiral screw is sucked up by alternately moving a pair of pistons of the cylinder device and pumped to the outside. Water can be satisfactorily removed by centrifuging in a dehydration tank, and the sludge sent to the ground will have a small amount of water, and there is no need for a huge sedimentation basin as in the past, and sludge can be easily treated. Will be things. Further, as compared with the case where the sludge is sucked up by a pump, the sludge is less likely to be wound up on the seabed, and there is an effect that a good dredging work can be performed without polluting the sea.

[Brief description of drawings]

FIG. 1 is a side view of a sled dredger.

FIG. 2 is a plan configuration diagram of FIG.

FIG. 3 is an enlarged side view of a spiral screw and a cylinder device portion.

FIG. 4 is a front view of a dust removing blade.

FIG. 5 is a plan view of a pair of cylinders of the cylinder device.

FIG. 6 is a plan configuration diagram of an upper valve chamber.

FIG. 7 is an internal structure diagram of a first dehydration tank.

[Explanation of symbols]

 1 Sludge dredger 2 Hull 3 Hanging rod 4 Discharge pipe 5 Floating body 7 Winch 10 Rotating frame body 11 Hinge part 12 Screw screw 13 Cylinder device 14 First dehydration tank 15 Second dehydration tank 20 Garbage collection chamber 21 Garbage collection blade 24 Lid 26 First Cylinder 27 Second Cylinder 30, 33 Piston 34 Lower Valve Chamber 36 Rotating Valve 37, 38, 40, 41 Valve Seat Tube 39 Upper Valve Chamber 43 Rotating Valve 45 Opening / Closing Valve 50 Hollow Shaft Tube 51 Peripheral Plate 55 Rotation Cylinder

Claims (1)

[Claims] 1. A helical screw for scraping sludge on the seabed, a cylinder device for sucking up and pumping the sludge collected by the screw by alternating movement of a pair of pistons, and centrifuging the sludge pumped from the cylinder device. A sledged dredger characterized by having a dehydration tank for dehydration.