JPH02153126A - Dredging apparatus - Google Patents

Abstract

PURPOSE:To reduce a treatment cost by arranging ribbon screws around the lower screw shaft of a plough set on the side of the tip of a vertical screw conveyor. CONSTITUTION:By the rotation of a plough 5, sludge on the periphery of a taking-in section is agitated, and is made softer and fluid, and is taken into a vertical screw conveyor 1 via a screen 11, an inner blade 8, and an outer blade 9. Then, by ribbon screws arranged around the lower screw shaft 3a of the conveyor 1, the sludge is made more fluid, and by screws 3, a rise force is applied to, and the sludge is shifted to a jet side. As a result, suction efficiency can be enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to dredging, which is used, for example, to dredge soft mud such as sludge accumulated in water intakes of power plants, seabeds, lakes, rivers, nine ports, etc. It is related to the device.

[Conventional technology] There is a pump-type dredging device as a conventional dredging device.

This pump-type dredging device has a large-capacity pump installed on a single boat 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 soft mud is sucked up along with the water. The soft mud dredged in this way is mainly from Ji
1! Transported by carrier to a landfill. 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 soft mud is so large that the solidifying agent cannot be mixed until after the surplus water is treated. The drawback is that water treatment requires a lot of money.

[Means for Solving the Problems] The dredging device of the present invention is provided with a rotatable plow at the tip end of a vertical screw conveyor, and a plurality of the plows are arranged at predetermined intervals in the vertical direction. The present invention has a screen provided thereon, a scraping blade integral with the screen and arranged in a direction perpendicular to the screen, and a ribbon screw disposed around the screw shaft at the bottom of the screw conveyor.

[Function] In the dredging device of the present invention, the soft mud around the intake portion is stirred and softened and fluidized by the rotation of the plow, and the soft mud is taken into the vertical screw conveyor by the scraping blade.

The soft mud that has reached the inside of the screw conveyor is further promoted to fluidize by a ribbon screw attached to the screw shaft, and is transferred to the discharge side by being given an upward force by the screw blades.

[Example] Hereinafter, the present invention will be described in detail using examples shown in the drawings.

FIG. 1 is a sectional view of a main part showing one embodiment of a dredging device according to the present invention, FIG. 2 is an enlarged front view of a plow, and FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2. The vertical screw conveyor 1 includes a cylindrical body 2 and a screw 3 that is rotatably housed in the body 2. The screw 3 lifts soft mud such as sludge. It is now possible to do so.

The screw 3 is connected to a motor (not shown) disposed on the upper end side of the cylindrical body 2, and is configured to be rotationally driven by the motor.

A plow 5 having digging and stirring functions is provided at the tip of the vertical screw conveyor 1.

This plow 5 is rotatably provided coaxially with the screw 3, and includes a rotary cylinder 6 rotatably provided on the outer periphery of the cylinder body 2, and a rotary cylinder 6° having the same diameter as the cylinder body 2. A canopy-shaped casing 7 fixed to the outer periphery of the rotating cylinder 6 degrees, an inner blade 8 and an outer blade 9 for scraping extending downward from the casing 7, and the blades 8.9
The structure includes a plurality of screens 11 arranged horizontally so as to be perpendicular to the screen and spaced apart from each other by a predetermined distance in the vertical direction, and having a rake 10 on the outer circumferential side.

As shown in detail in FIG. 3, the inner blade 8 is provided so as to be located around the ribbon screw 20 provided on the screw shaft 3a, and the inner blade 8 is provided so as to be located around the ribbon screw 20 provided on the screw shaft 3a. Block 3
Connected to A.

The outer blade 9 is arranged around the inner blade 8, and the rotation of the inner blade 8 and the outer blade 9 draws surrounding soft mud into the cylinder body 2.

The screen 11 is for preventing large rocks and foreign objects from entering the cylinder body 2 through the plow, and is made of a substantially triangular bar screen as shown in FIG. .9 are each fixed to the screen 11 by welding. The tip of each rake 10 is
As shown in FIG. 2, the screen 11 is slightly bent in the vertical direction, and the screen 11 rotates while digging with teeth to prevent foreign matter from clogging.

As shown in FIG. 1, the rotation v46 and the rotating cylinder 6° are mounted coaxially with the cylinder 2 of the vertical screw conveyor 1 and rotatable around the axis.

Further, a rack gear 12 is provided around the upper part of the rotary cylinder 6, and the rack gear 12 is connected to a pinion gear 13.
It is always in a state of one mesh. This pinion gear 13 is fixed to the lower end of a drive shaft 14 extending along the side surface of the cylindrical body 2 . The upper end of the bale drive shaft 14 is connected to a motor 15 disposed on the upper side of the cylinder 2, and is driven by the motor 15. Rotating cylinder 6 via pinion gear 13 and rack gear 12
can be rotated. The rotary tube 69 and the plow 5 suspended therefrom are rotatably supported by a thrust bearing 16 attached to the cylinder body 2. Further, as shown in FIG. 4, the lower end of the cylinder 2 is provided with two stages of gland packings 6a and 6b to prevent water from entering into the double cylinder, similar to the upper gland packing 17.

On the other hand, a ribbon screw 20 having the same turning direction as the screw 3 is provided around the screw shaft 3a below the plow 5 via a plurality of grooves 20a.

Next, the operation of the dredging device configured as above will be explained. The drive device of the dredger (not shown) is activated to insert the plow 5 located at the tip of the vertical screw conveyor 1 into the soft mud at the bottom of the water, rotate the driving bag R (not shown) of the screw 3, and at the same time the motor is activated. Rotate 15. The rotation of the motor 15 also rotates the plow 5 via the rotary cylinder 6, and while the rotation of the plow 5 stirs and fluidizes the soft mud around the intake section, the inner blade 8 and the outer blade 9 Soft mud is taken into the cylinder body 2 through the plow 5. At this time, foreign matter mixed in the soft mud is prevented from entering the plow 5 by the screen 11, and is discharged to the outside along the rake 10 surface. .

On the other hand, the soft mud introduced into the cylinder 2 from inside the plow 5 is further stirred by the ribbon screw 20 to further promote fluidization, and then rises inside the cylinder 2 by the rotation of the screw 3 located directly above it. For example, soft mud discharged from the vertical screw conveyor 1 is mixed with a solidifying agent and then discharged to a predetermined location from a discharge port (not shown). Dumped in a landfill.

In addition, if the diameter of the screw 3 is large, the screen 11
The vertical distance between them may be increased.

On the other hand, if a vertical bar is provided between the screens 11 so that the space between the screens 11 becomes a so-called base hole, even smaller foreign matter can be prevented from entering.

[Effects of the Invention] As described above, according to the present invention, the soft mud is introduced into the screw conveyor in a state where surplus water is reduced, so that it is possible to significantly reduce the cost of soft mud processing.

In addition, a rotatable plow equipped with a scraping blade and a screen is provided at the tip of the screw conveyor, and a ribbon screw further promotes fluidization, so that soft mud can be easily taken into the screw conveyor. This improves the loading efficiency and prevents foreign matter from entering the screw conveyor, ensuring smooth operation of the screw conveyor.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing one embodiment of the dredging device according to the present invention, Fig. 2 is an enlarged front view of the plow, Fig. 3 is a sectional view taken along line m-■ in Fig. 2, and Fig. 4 is FIG. 3 is a partially enlarged sectional view of the lower end of the cylindrical body. l... Vertical screw conveyor, 2... Cylindrical body, 5...
- Plow, 6, 6'...Rotating tube, 8...Inner blade, 9...Outer blade, 11...Screen, 20...Ribbon screw. Figure 2 Figure 4 Patent applicant Ube Industries, Ltd.

Claims (1)

[Claims] (1) A vertical screw conveyor, a plurality of screens rotatably provided at the lower end of the vertical screw conveyor and spaced apart from each other by a predetermined distance in the vertical direction; What is claimed is: 1. A dredging device comprising: a plow having scraping blades arranged in intersecting directions; and a dredging device, characterized in that a ribbon screw is disposed around a lower screw shaft of the vertical screw conveyor.