JPH0673757A - Dredger - Google Patents

Abstract

PURPOSE:To dredge hard sludge easily by rotatably installing a plurality of stages of excavating bites separated at proper intervals in the vertical direction at both end sections of an approximately semi-circumferential mud collecting plate disposed on the outer circumference of an inlet device in a revolvable manner. CONSTITUTION:A mud collecting plate 11 is positioned on the rear side in the direction of dredging, and a screw blade 3, an inlet cutter 5b and a plurality of excavating bites 52 are rotated, thus shearing, agitating and fluidizing a sludge layer. The fluidized sludge layer is conveyed to the upper section of a vertical type screw conveyor 2 and discharged from a discharge opening 2a, and transported into a trickle pond. The intrusion to the inside of foreign matters in sludge is prevented by the cutter 5b at that time. When hard sludge adheres on the cutter 5b and the cutter 5b may be clogged, the growth of the sludge is avoided by an auxiliary cutter 11a fixed to the mud collecting plate 11. The hard sludge is excavated by the bites 52, and the proceeding of a dredger and the change of the direction are facilitated. Accordingly, even when the hard sludge is dredged, smooth operation is enabled while continuous stable operation can be ensured, and efficiency can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredging device used for dredging soft mud such as sludge accumulated in a water intake, a seabed, a lake, a river, a port, etc. of a power plant.

[0002]

2. Description of the Related Art Dredging of sludge such as sludge deposited on the seabed may cause a submersible pump to plunge into the sludge layer and suck it up.
Alternatively, it was done by scooping up the soft mud from the seabed with a grab bucket. However, this method cannot dredge a high-concentration soft mud, and because it sucks a large amount of seawater together with the soft mud, it has a poor pumping efficiency. In addition, the grab bucket method causes turbidity in seawater, There was a problem of causing secondary pollution.
Therefore, in order to solve these problems, a dredging device consisting of a vertical screw conveyor and an inlet device rotatably arranged at the lower end of this vertical screw conveyor was put into practical use, and it was placed near the upper end of the vertical screw conveyor. The soft mud discharged from the discharge port is pressurized by a pressure pump and pressure-fed to the discharge pipe via the check valve. Further, compressed air is pressure-injected from an air nozzle (ejector) provided in the middle of the discharge pipe for a long distance. A method of transportation has been proposed by the applicant.

FIG. 6 shows a conventional dredging device of this type, which is a dredging device 1 provided with a rotatable semi-circular mud collecting plate 11 on the outer periphery of an inlet device 5, in which the mud collecting plate 11 is dredged. After being rotated and opposed to the back side in the direction, the inlet cutter 5 is slowly moved forward so that the inlet cutter 5b horizontally shears, stirs, and fluidizes the solidified mud layer at the dredging point to vertically move it. It is guided to the inside by the suction force due to the rotation of the screw blades 3 of the mold screw conveyor 2, and is moved up by the screw blades 3. At this time, the solidified soft mud is cut into slices by the inlet / cutter 5b and becomes soft and fluidized, but the foreign matter present in the soft mud cannot pass between the inlet / cutter 5b and is eliminated. To be done. The soft mud that has been lifted and transferred by the vertical screw conveyor 2 in this way is discharged from the discharge port 2a at the upper end and is conveyed to the next step.

When the soft mud is hard or has a strong adhesiveness, the soft mud adheres to the inlet cutter 5b itself as the operation continues, and this develops to clog the space between the inlet cutter 5b. The passage of the soft mud deteriorates,
Dredging and transportation capacity will be reduced. As a countermeasure in such a case, the inner surface of the mud collector 11 is projected horizontally and the inlet
The auxiliary cutters 11a sandwiched between the cutters 5b are designed to destroy and remove these clogged solid matters.

[0005]

As described above, when the conventional dredging device dredges soft soft mud, the sludge in front of the dredging direction is cut by the inlet cutter of the inlet device for fluidization, and the sludge is collected. Since it is sequentially taken up into the vertical screw conveyor while being drawn up by the plate, it is possible to carry out the dredging work continuously and efficiently. However, when the soft mud is solidified or hard, for example, as shown in FIG. 7, both ends of the mud collecting plate 11 come into contact with the hard soft mud, so that the dredging device moves in the traveling direction (left in FIG. 7). When moving in the direction), a large resistance is received and smooth operation is hindered. Further, when the dredging direction is changed and the mud collecting plate 11 is reversed when moving to the right side of FIG. 7, there is a drawback that the mud collecting plate 11 itself does not have an excavating ability, so that the mud collecting plate 11 cannot be smoothly reversed.

[0006]

In order to solve the above-mentioned problems, in the dredging device of the present invention, a vertical screw conveyor and an outer peripheral surface rotatably provided at the lower part of the vertical screw conveyor are provided. And an inlet device in which a plurality of stages of inlet cutters are vertically spaced from each other,
What is claimed is: 1. A dredging device comprising a mud collecting plate having a substantially semicircular shape rotatably arranged on the outer circumference of the inlet device, wherein a plurality of stages are vertically provided at right and left ends of the mud collecting plate. The excavator equipped with the excavating bite is rotatably provided.

[0007]

In the dredging device of the present invention, since the excavators are provided at both ends of the mud collecting plate, the inlet device and the mud collecting plate both move in the dredging direction while excavating, even with hard soft mud. You can work smoothly without any hindrance. Further, even when the mud collecting plate is reversed, the excavator on the tip side in the reversing direction of the mud collecting plate is rotated while being rotated, so that even soft mud can be smoothly reversed.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 5 relate to an embodiment of the present invention,
1 is an overall vertical cross-sectional view of the dredging device, FIG. 2 is a bottom plan cross-sectional view of the dredging device, FIG. 3 is a bottom side view of the dredging device, and FIG.
Fig. 5 is a schematic plan view of the dredging device during the dredging work, and Fig. 5 is a schematic plan view of the mud collecting plate inverted.

In the figure, 1 is a dredging device, 2 is a vertical screw conveyor, 2A is a casing, 3 is a screw (blade), 3a is a rotating shaft, 3b is an electric motor for driving the screw,
4 is a casing of the inlet device, 5 is an inlet device, 5a is an inlet cylinder, 5b is an inlet cutter,
6 is a bearing, 7 is a girth gear, 8 is a pinion gear, 9 is an electric motor, 9 is a protective cover, 11 is a mud collecting plate, 11a is an auxiliary cutter, 12 is a bearing, 13 and 14 are chain wheels, 15 is an electric motor, 16 is an electric motor. The protective cover 50 is an excavator.

As shown in the figure, the vertical screw conveyor 2
Has a cylindrical casing 2A, a screw rotating shaft 3a housed in the casing 2A and driven to rotate by a top electric motor 3b, and a screw blade 3, and the screw blade 3 causes sludge and the like. The soft mud is lifted and discharged from the upper discharge port 2a.

On the other hand, below the casing 2A of the vertical screw conveyor 2, a casing 4 of an inlet device 5 which rotates concentrically and with the same diameter as the casing 2A is suspended via a bearing 6, and an electric motor 9 and a pinion are provided. It can be rotationally driven via the gear 8 and the girth gear 7. At the lower end of the casing 4, inlet-cutters 5b having a toe-shaped plan view as shown in FIG. 2 are mounted in a plurality of stages on an inlet cylinder 5a having a large side opening. As shown in FIG. 2, the inlet cutter 5b is formed in a circular saw shape so as to shear the soft mud layer located on the outer circumference by rotation.

Further, a substantially semicircular mud collecting plate 11 is arranged on the outer circumference of the casing 4 so as to be supported by bearings 12 so as to cover the outer circumference of the inlet cutter 5b, and a motor 15 is provided via chain wheels 13 and 14. It is driven to rotate by. Reference numeral 16 is a protective cover for the chain wheel. A flat plate-shaped auxiliary cutter 11a is arranged on the inner peripheral surface of the mud collecting plate 11 so as to be inserted into the gap between the inlet cutters 5b. Reference numeral 11b is a through hole for passing water.

Further, at the both ends of the mud collecting plate 11, a plurality of substantially horizontal excavating bites 52 arranged vertically at equal pitches are fixedly mounted on a vertical rotating shaft 54 supported by bearings 56, and a hydraulic motor 58 is provided. Is driven to rotate. These devices are collectively referred to as an excavator 50. The rotation direction of the excavator 50 is a direction toward the inside of the mud collecting plate 11, as shown in FIG.

The operation of the dredging device 1 of the present invention constructed as above will be described. The dredger equipped with the dredging device 1 of the present invention is transported to the dredging site, stopped, and then the electric motor 15 is driven and adjusted so that the mud collecting plate 11 comes to the back side in the dredging direction. After that, the vertical screw conveyor 2 is gently lowered until it reaches the bottom of the sea. After the inlet device 5 (specifically, the inlet cutter 5b) and the mud collecting plate 11 are landed and buried in the seabed soft mud layer, the electric motor 3b is driven to rotate the screw blades 3 and simultaneously the electric motor 9 is driven. When the inlet cutter 5b and the hydraulic motor 58 of the excavator 50 are rotated, the seabed soft mud layer is sheared, agitated, and fluidized, and the suction force generated by the rotation of the screw blades 3 passes through the openings of the inlet cylinder 5a one after another and the inside of the apparatus Enter, goes up by the screw blades 3 and reaches the upper part of the vertical screw conveyor 2 and is discharged from the discharge port 2a, passing through the electromagnetic flow meter, the check valve, the pressure pump, and the discharge pipe provided in the next process. Will be transported to the final place.

Unlike the submersible pump, the transportation by the screw blades 3 of the vertical screw conveyor 2 mainly carries out the vertical transportation of the solid soft mud without much liquid. During this time, foreign matter mixed in the soft mud layer is blocked by the inlet cutter 5b and prevented from entering the inside.

However, even if there is no foreign matter, the hardened mud, the originally hard mud, or the strongly softened mud gradually adheres to and develops on the outer periphery of the inlet cutter 5b as the operation continues, and finally, Is the upper and lower inlet cutters 5b
It may be clogged due to close contact with each other across the space, and if this state covers the entire surface of the inlet / cutter 5b, it will be difficult for the soft mud to pass, and the amount of passage will be extremely reduced, drastically reducing the dredging capacity. To do. In order to avoid this condition, the auxiliary cutter 1 is always installed in the space between the inlets and cutters 5b.
1a enters to prevent the formation of clogging.

When the soft mud is hard or hardened, since the excavators 50 on both ends of the mud collecting plate 11 are driven to rotate, the mud collecting plate 11 can be provided with an excavating function. The progress of the dredging device 1 is smooth and the dredging efficiency is improved. Further, as shown in FIG. 5, it is easy to reverse the mud collecting plate 11 when changing the dredging direction.

As described above, according to the present invention, only the soft mud from which foreign matter has been removed can be efficiently transported in a high concentration with little extra water in a normal operating state, and even in the case of a hard soft mud. The mud plate can be smoothly moved and turned over without any trouble.

[0019]

As described above, in the dredging device of the present invention, since the excavator is provided on the mud collecting plate, the dredging work can be performed smoothly without any trouble even when the hard soft mud is dredged. Therefore, continuous stable operation is secured and dredging efficiency is improved.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view of a dredging device showing an embodiment of the present invention.

FIG. 2 is a bottom plan cross-sectional view of the dredging device showing the embodiment of the present invention.

FIG. 3 is a bottom side view of the dredging device showing the embodiment of the present invention.

FIG. 4 is a schematic plan explanatory view of a dredging device during a dredging operation showing an embodiment of the present invention.

FIG. 5 is a schematic plan view of the dredging device when the mud collecting plate is turned over, showing the embodiment of the present invention.

FIG. 6 is an overall vertical cross-sectional view of a conventional dredging device.

FIG. 7 is a schematic plan view of a conventional dredging device during a dredging operation.

[Explanation of symbols]

 1 Dredging Device 2 Vertical Screw Conveyor 2A Casing 2a Discharge Port 3 Screw Blade 3a Rotating Shaft 3b Electric Motor 4 Casing 5 Inlet Device 5a Inlet Tube 5b Inlet / Cutter 6 Bearing 7 Garth Gear 8 Pinion Gear 9 Electric Motor 11 Mud Cover 11 Auxiliary cutter 12 Bearing 13 Chain wheel 14 Chain wheel 15 Electric motor 16 Protective cover 50 Excavator 52 Excavation tool 54 Rotating shaft 56 Bearing 58 Hydraulic motor

Claims (1)

[Claims] 1. A vertical screw conveyor, an inlet device provided rotatably at a lower portion of the vertical screw conveyor and provided with a plurality of stages of inlet cutters on an outer peripheral surface thereof and vertically spaced apart at appropriate intervals, and the inlet. What is claimed is: 1. A dredging device, comprising a mud collecting plate having a substantially semicircular shape rotatably arranged on the outer periphery of the device, wherein a plurality of stages of excavation are vertically spaced at right and left ends of the mud collecting plate. A dredging device equipped with an excavator equipped with a rotatable bite.