JPH0475969B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for dredging sludge, soft mud, etc. (hereinafter abbreviated as sludge) deposited on the seabed or the like.

[Prior Art] There is a pump type dredging device as a conventional dredging device.
In this pump-type dredging device, a large-capacity pump is installed on a barge or the like, and a hose is extended from the pump to the bottom of the ocean, such as the bottom of a lake, and the sludge is sucked up along with the water. The sludge dredged in this way is mainly transported to a landfill by a carrier ship. At the landfill, solidifying agents and flocculants are added to solidify the waste.

[Problems to be Solved by the Invention] However, in the conventional dredging equipment described above, the amount of water that is sucked up at the same time as the sludge is so large that the solidifying agent cannot be mixed until after the surplus water has been treated. The drawback was that it required a large amount of money to treat the surplus water.

[Means for Solving the Problems] The dredging device of the present invention includes an inlet device at the tip of a screw conveyor that has an opening for sludge intake on the side of the tip. The inlet device includes a plurality of screens fixed to the tip of the cylindrical casing of the screw conveyor and provided at intervals in the axial direction of the cylindrical casing;
and a blade rotatably disposed around the screen and having a rake disposed between the screens. Note that, if necessary, a water stop plate can be provided behind the opening.

[Function] In the dredging device of the present invention, the inlet device is inserted into the sludge deposited on the bottom of the ocean, lake, river, etc., and the sludge is drawn into the screw conveyor by rotation of the blades. . At this time, foreign matter mixed in the sludge is prevented from entering by a screen. Furthermore, the foreign matter on the screen is removed by rotating the blade in the opposite direction to exert a rake function. Furthermore, by providing a water stop plate, even if a cavity is created due to the excavation and intake of sludge, the water stop plate closes the upper part of the intake where the upper layer of water tends to flow, preventing the upper layer of water from entering. will be done.

[Example] Hereinafter, details of the present invention will be explained using examples shown in the drawings.

1 to 3 are diagrams showing an embodiment of a dredging device according to the present invention. Reference numeral 1 designates a rigid screw conveyor, which includes a cylindrical casing 2 and a screw shaft 3 which is housed inside the cylindrical casing 2 and has screw blades 4 fixed thereto as shown in FIG. The cylindrical casing 2 is provided with an opening 5 at its tip for taking in sludge, and this opening 5 has a substantially rectangular shape that is elongated in the axial direction of the cylindrical casing 2, as shown in detail in FIG. A plurality of them are provided at regular intervals in the circumferential direction.

An inlet device 6 for drawing in sludge is provided at the tip of the rigid screw conveyor 1.
This inlet device 6 is configured to include a screen 7, a blade 8, a water stop plate 9, and a blower 10. The screen 7 is for preventing large rocks and foreign objects from entering the cylindrical casing 2 through the opening 5.
A plurality of pieces (in this example, 7
) are arranged. The screen 7 is a ring-shaped member, and as is clear from FIG. 6, the screen 7 is formed to have a T-shaped cross section. The blade 8 is disposed around the screen 7, and is fixed to the tip side of the rotary cylinder 11 via a waterstop plate 9, as shown in detail in FIG. A plurality of blades 8 are provided in the circumferential direction of the cylindrical casing 2, and as shown in FIG. The screen 7 is designed to remove foreign matter on the screen 7. Further, a water stop plate 9 located at the rear end side of the blade 8 (upper end side in the figure) is fixed to the rotary cylinder 11, and water in the upper layer passes through the opening 5 from the rear end side of the blade 8. It is designed to prevent entry into the cylinder upper casing 2. By this,
This reduces the amount of water that is sucked up at the same time as sludge. The blow 10 is for stirring and fluidizing the sludge around the intake part, and is rotatably disposed around the blade 8. Further, as is clear from FIG. 1, this blow 10 is fixed to the outer circumference of the rotary cylinder 11.

The rotary cylinder 11 is coaxially attached to the cylindrical casing 2 of the rigid screw conveyor 1 and rotatable around its axis. In addition, this rotating cylinder 11
A rack gear 13 is disposed around the upper part of the shaft, and the rack gear 13 is always in mesh with a pinion gear 14. This pinion gear 14
is fixed to the lower end of a drive shaft 15 provided along the side surface of the cylindrical casing 2. The upper end of the drive shaft 15 is connected to a motor 16 disposed on the upper side of the cylindrical casing 2, and the rotating cylinder 11 is driven by the motor 16 via the drive shaft 15, pinion gear 14, and rack gear 13. It is designed to be driven in rotation. The screw shaft 3 is rotatably supported by a bracket 17 provided at the tip of the cylindrical casing 2.

Next, the operation of the dredging device configured as above will be explained. When the drive device of the dredger (not shown) is activated, the inlet device 6 located at the tip of the rigid screw conveyor 1 is inserted into the sludge at the bottom of the water, and the drive device (not shown) of the screw shaft 3 is rotated. At the same time, the motor 16 is rotated. The rotation of the motor 16 also rotates the blow 10 via the rotary cylinder 11, and the rotation of the blow 10 agitates and fluidizes the sludge around the intake part (around the inlet device 6), while the blade 8 , the cylindrical casing 2 through the opening 5
Take sludge inside. At this time, foreign matter mixed in the sludge is prevented from entering through the opening 5 by the screen 7.

Also, during forward rotation (rotation in the direction of arrow A in FIG. 2), the foreign object 18 (see FIG. 2) is removed from the screen 7.
Sometimes it falls in between. In this case, the current in the motor 16 for rotating the blade 8 increases, and upon detecting this increase in current, the motor 16 reverses, causing the blade 8 to rotate in the opposite direction (in the direction of arrow B in FIG. 2). As a result, the foreign matter 18 is scraped out by the rake 12. After scraping, the rotation of the motor 16 is returned to normal rotation, and the blade 8 takes in the sludge again. Further, rising water that attempts to flow into the opening 5 from the rear end side of the blade 8 is prevented from entering by the water stop plate 9.

On the other hand, the sludge introduced into the cylindrical casing 2 through the opening 5 rises within the cylindrical casing 2 due to the rotation of the screw shaft 3, and is discharged from a drain port (not shown) to a predetermined location. For example, the sludge discharged from the screw conveyor 1 is added and mixed with a solidifying agent, and then is dumped into a landfill via a carrier, a pressure hose, or the like.

In the above-described embodiment, a blower 10 is provided to stir and fluidize the sludge around the intake part, but if the sludge around the intake part is highly fluid, the blower 10 is installed. 10 can be omitted.

[Effects] As described above, according to the present invention, sludge is introduced into the screw conveyor in a state where surplus water is reduced, so it is possible to significantly reduce the sludge treatment cost. In addition, since the inlet device is provided on the tip side of the screw conveyor, the efficiency of taking in sludge into the screw conveyor is improved, and it is also possible to prevent foreign matter from entering the screw conveyor. This ensures smooth operation of the Yukon conveyor.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of essential parts showing an embodiment of the dredging device according to the present invention, Fig. 2 is a cross-sectional view of Fig. 1 taken along the - line, and Fig. 3 is a cross-sectional view of Fig. 2 taken along the - line. 4 is a perspective view of the screw shaft and screw blades, FIG. 5 is a perspective view of the main part of the cylindrical casing, FIG. 6 is a perspective view of the main part of the screen, and FIG. 7 is a perspective view of the rotating cylinder. FIG. 3 is a perspective view of main parts of a blade and a water stop plate. DESCRIPTION OF SYMBOLS 1... Rigid screw conveyor, 2... Cylindrical casing, 3... Screw shaft, 4... Screw blade, 5... Opening, 6... Inlet device, 7
... Screen, 8 ... Blade, 9 ... Water stop plate, 10 ... Blow, 12 ... Rake.

Claims (1)

[Scope of Claims] 1. A screw conveyor in which a screw shaft to which screw blades are fixed is housed in a cylindrical casing, and an opening is opened on the side of the tip of the cylindrical casing, and the screw conveyor and an inlet device provided at the tip of the cylindrical casing, the inlet device being a plurality of inlet devices installed around the outside of the opening of the cylindrical casing and spaced apart by a predetermined distance in the axial direction of the cylindrical casing. A scavenging device comprising: a ring-shaped screen; and a blade rotatably disposed around the screen and having a rake disposed between the screens on the inside. 2. The dredging device according to claim 1, wherein a water stop plate is provided on the outer periphery of the casing on the rear side of the opening.