JPH0860695A - Small scale dredging mechanism - Google Patents

Abstract

PURPOSE: To dredge efficiently by mounting a plurality of edges to the bottom of a dredging cylinder, mounting a plurality of water jet nozzles to the outer periphery of the dredging cylinder, and housing turnably an impeller inside the dredging cylinder. CONSTITUTION: Water is supplied to a water jet nozzle 9 by way of a pipe 7 mounted to a dredging cylinder 2 where the jet water is sprayed to accumulated mud, while edges 5 are pulled, thereby loosening the accumulated mud. An impeller 12 having a plurality of blades 11 installed to a rotary inner cylinder 10 is driven with a submergible motor 14, thereby agitating the loosen mud so as to turn the mud into fine particles. Furthermore, the fine particle mud is sucked up with a slurry pump installed to the top of a dredging mechanism 1.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dredging mechanism for small-scale dredging.

[0002]

2. Description of the Related Art Various dredgers and dredging robots have been developed for dredging, transporting and post-treating bottom mud of oceans, lakes, etc. Typical examples of such dredging mechanisms are (1) vacuum pump Negative pressure mud suction method to suck mud by pressure, (2) Mud with high density, rotating bucket wheel method to excavate excavated dirt with bucket wheel, and (3) Swing rotor with atmospheric atmosphere in hood There are a scraper method that sucks up mud by rotating a scraper and (4) a screw conveyor method that lifts mud with a spiral screw and conveys it with a screw conveyor.
Sandy soil peculiar to dredging site, which is determined by water content, particles, etc.
A dedicated dredging mechanism is set for bottom mud such as silt and cohesive soil to pump and transport a large amount of mud.

However, such a dredging mechanism is very effective as a mechanism of a system for efficiently and large-scale dredging a large amount of sediment when the sediment has the same properties and is semi-infinite. In order to carry out small-scale dredging, such as dredging bottom mud where mud with different properties is accumulated in a 1-meter irrigation canal, etc., one mechanism system cannot perform dredging because it considers mud with narrow property changes. However, when dredging sedimentary soils with different properties, there is a problem that the efficiency is poor and the cost is high, for example, by exchanging the dredging mechanism.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and is simple and efficient regardless of the properties such as the water content ratio and the density of sedimentary mud in sandy layers and silt layers. An object of the present invention is to provide a dredging mechanism for small-scale dredging which is capable of dredging, is compact, is simple, and is inexpensive.

[0005]

To this end, according to the present invention, a plurality of edges are attached to the bottom of the dredging cylinder facing the sedimentary mud, and a plurality of water jet nozzles are radially attached to the outer periphery of the dredging cylinder. It is characterized in that an impeller having a plurality of blades is rotatably housed inside a dredge barrel.

[0006]

In the dredging mechanism for small-scale dredging of the present invention, the edge of the bottom of the dredging cylinder and the water jet nozzle on the outer periphery loosen the connection of the sediment soil that has a high water content and is densely and firmly tightened, and the dredging is performed. The impeller inside the cylinder agitates the intermediate sediment between loose sediment and tight soil to make it finer and dredge it.

[0007]

1 is a front view of the present dredging mechanism, FIG. 2 is a plan view thereof, and FIG. 3 is a detailed view of a portion III of FIG. 1 showing the dredging mechanism for small-scale dredging of the present invention. is there. In the above figure, the dredging barrel 2 of the dredging mechanism 1 is composed of a straight barrel 3 and a cone barrel 4, both of which are welded and joined after mounting the equipment inside, and the bottom of the cone barrel 4 is usually dredged A donut-shaped bottom plate 6 to which the used edge 5 is evenly attached by welding is attached by welding.

Pipes 7 for distributing water sent from a water pump (not shown) are radially attached by pipe stoppers 8 at four locations on the outer circumference of the dredging cylinder 2, and water jet nozzles 9 are provided at the tips of the pipes 7. It is arranged and on the other hand, the dredge 2
An impeller 12 composed of an inner cylinder 10 and eight blades 11 located below the inner cylinder 10 is housed inside. The inner cylinder 10 and the dredging cylinder 2 are gear-engaged with each other, oil is sent through the pipe 13, the underwater motor 14 is driven and rotated, and the transmission gear 16 is rotated via the transmission shaft 15, whereby the impeller is rotated. 12 is rotated. The transmission gear 16 includes snap rings 17a and 17b.
It is fixed with a seal 18a for waterproofing.
Are fixed by a snap ring 17c. The doughnut-shaped bearing 19 and the snap rings 17d, 1 for fixing it so that the impeller 12 rotates at a constant level.
7e, and a seal 18b, a seal 18c, and a snap ring 17f are attached to protect the bearing 19 from above and below. A slurry pump (not shown) used for ordinary dredging is disposed above the dredging mechanism 1.

However, the dredging mechanism 1 is inserted from above into an irrigation canal in which mud having different water content ratios and densities is accumulated.
Its base is connected to a work vehicle equipped with a slurry pump, a water jet supply pump, a water-mud separation device, and the like.

In such an apparatus, the water fed through the pipe 7 attached to the dredging cylinder 2 is used for the dense and tightly packed sediment mud having a low water content in the irrigation channel, and the cone cylinder 4 is used. Water is sprayed from water jet nozzles 9 installed at four places evenly to loosen the deposited soil, and the edge 5 which is usually used for solidified soil is pulled to loosen the deposited soil. Then, the mud soil in which the solidified sediment has become loose or already loose is stirred by an impeller 12 having eight blades 11 provided on the rotating inner cylinder 10,
Further finely granulate. For finely divided mud or silty mud, suction with a normal slurry pump.

Thus, according to the dredging mechanism 1, the edge 5, the water jet nozzle 9 and the impeller 12 are provided, so that the silt-like soft sedimented mud is impeller 12.
It can be dredged easily by stirring with a water jet nozzle 9 to make the accumulated mud intermediate between the silt and the solidified soil, and easily stirred by the impeller 12 to dredge it. The accumulated mud is edge 5
After making a crack, spray a water jet to make it a loosing, then stir it with an impeller 12 to easily dredge it,
Therefore, the deposited mud can be dredged efficiently and easily regardless of the solidified state of the dredged soil.

[0012]

In summary, according to the present invention, a plurality of edges are attached to the bottom of the dredging cylinder facing the accumulated mud, and a plurality of water jet nozzles are radially attached to the outer periphery of the dredging cylinder. By rotatably housing an impeller with multiple blades inside, it is possible to dredge easily and efficiently regardless of the characteristics such as the water content ratio and density of the sediment mud in both sandy layer and silt layer, and it is compact and simple. The present invention is extremely useful industrially because a dredging mechanism for small-scale dredging that can be made cheaper is obtained.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a dredging mechanism for small-scale dredging of the present invention.

FIG. 2 is a plan view of the above.

FIG. 3 is a detailed view of a portion III in FIG.

[Explanation of symbols]

 1 Dredging Mechanism 2 Dredging Cylinder 3 Straight Cylinder 4 Cone Cylinder 5 Edge 6 Bottom Plate 7 Piping 8 Piping Stop 9 Water Jet Nozzle 10 Inner Cylinder 11 Blade 12 Impeller 13 Piping 14 Submersible Motor 15 Transmission Shaft 16 Transmission Gear 17a, 17b, 17c, 17d, 17e, 17f Snap ring 18a, 18b, 18c Seal 19 Bearing

Claims (1)

[Claims] 1. A plurality of edges are attached to the bottom of a dredging cylinder facing the sedimentary mud, a plurality of water jet nozzles are radially attached to the outer circumference of the dredging cylinder, and a plurality of blades are further provided inside the dredging cylinder. A dredging mechanism for small-scale dredging, characterized in that the impeller is rotatably housed.