JPH02147729A - Dredging device - Google Patents

Abstract

PURPOSE:To improve intake efficiency, reduce a spill, and reduce the soft mud processing cost by peripherally providing a bone screw on the lower screw of a screw conveyor provided with raking blades and screens. CONSTITUTION:A blow 5 provided with multiple screens 11 vertically separated by the preset interval and braking inner blades 8 and outer blades 9 integrated with them is provided on the tip side of a vertical screw conveyor 1. A bone screw 20 is provided on the outer periphery of a screw 3 at the lower side from the blow 5 via ribs 21. Soft mud is stirred and fluidized by the rotation of the blow 5, and the infiltration of foreign objects is prevented by the screens 11. Soft mud is taken into the conveyor 1 by the blades 8 and 9, and the soft mud thus taken in is lifted and conveyed to the discharge side which fluidization is accelerated by the bone screw 20.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used, for example, in dredging soft mud such as sludge accumulated in water intakes of power plants, seabeds, lakes, surveying ports, etc. This relates to dredging equipment.

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

This pump-type dredging device installs a large-capacity pump on a barge or the like, and extends a hose from the pump to the bottom of the ocean, such as the bottom of a lake, and sucks up the soft mud along with the water. The soft mud 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.

[Problem to be solved by the invention] However, in the conventional V & pump device 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 in until after the leftover water has been treated, which has the drawback of requiring a large amount of cost to treat the leftover water.

[Means for Solving the Problems] The dredging device of the present invention is one in which a blow is rotatably provided on the tip side of a vertical screw conveyor, and a plurality of blows are arranged at predetermined intervals in the vertical direction. The present invention has a structure in which a screen is provided, a scraping blade is provided integrally with the screen and arranged in a direction perpendicular to the screen, and a ribbon screw is provided around the screw blade 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 fluidized by the ribbon screw attached to the screw blade, and is transferred to the discharge side by being given an upward force by the screw blade.

[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 l has a structure including a cylindrical body 2 and a screw 3 rotatably housed in the cylinder 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), 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 I.

This plow 5 is rotatably provided coaxially with the screw 3, and has 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', 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 orthogonal to the screen and spaced apart from each other by a predetermined distance in the downward direction of the L, 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 at the tip of the screw 3, and is supported by a bracket 8a extending in the radial direction to support the tip bearing of the screw 3. It is connected to block 3A.

The outer blade 9 is arranged around the inner blade 8, and the surrounding soft mud is taken into the cylinder body 2 by rotation of the inner blade 8 and the outer blade 90.

The screen 11 is for preventing large rocks and foreign objects from entering the cylinder 2 through the plow 5.
As shown in FIG. 3, it consists of a substantially triangular bar screen, and the blades 8.9 are each fixed to the screen 11 by welding. As shown in FIG. 2, the tip of each rake 10 is slightly bent downward, so that the screen 11 rotates while digging with its teeth to prevent foreign matter from clogging it.

As shown in FIG. 1, the rotary cylinder 6 and the rotary cylinder 6° are mounted coaxially with the cylindrical body 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.
I am in a constant state of confusion. This pinion gear 13 is
It is fixed to the lower end of the driving shirt (14) which is placed along the side surface of the cylinder body 2. Also.

The upper end of the drive shaft 14 is connected to a motor 15 disposed on the upper side of the cylindrical body 2, and is driven by the motor 15. The rotary cylinder 6 is rotatably driven via a pinion gear 13 and a rack gear 12. The rotary cylinder 62 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 [7].

On the other hand, a ribbon screw 20 is fixed to the outer periphery of the screw 3 below the blow 5 via a plurality of flat lips 21.

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 l into the soft mud at the bottom of the water, and at the same time the drive device of the screw 3 (not shown) is rotated and the motor 15 is activated. Rotate. 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 remove the plow. Soft mud is taken into the cylinder 2 through the blower 5. At this time, foreign matter mixed in the soft mud is prevented from entering the blower 5 by the screen 11, and is discharged to the outside along the surface of the rake 10. .

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.
For example, soft mud discharged from a vertical screw conveyor l is discharged from a discharge port (not shown) to a predetermined location, and a solidifying agent is added thereto.

After being mixed, it is dumped into a landfill via a transport vessel or a pressure hose.

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 hole is provided between the screens 11 so that the space between the screens 11 becomes a so-called base hole, it is possible to prevent even smaller foreign matter 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 the line ■-■ in Fig. 2, and Fig. 4 is FIG. 3 is a partially enlarged sectional view of the lower end of the cylindrical body. ■... 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 blow having scraping blades disposed in intersecting directions; and a dredging device, characterized in that a ribbon screw is provided around a lower screw blade of the vertical screw conveyor.