JPH0414528A - Dredger - Google Patents

Abstract

PURPOSE:To secure the smooth action of a screw conveyer by a method in which a rotary sludge-collecting plate is set on the periphery of an inlet cutter, and an auxiliary cutter projected into the space between cutters is provided to the inner surface of the sludge-collecting plate. CONSTITUTION:In a dredger consisting of a vertical screw conveyer 1, a casing 2, a blade 3, an inlet cutter 5, a casing 4 for the cutter 5, and a sludge-collecting plate 11, sludge is discharged from the upper discharge port 2a by the suction force of the blade 3. A flat plate-type auxiliary cutter 11a which can be inserted into the space of each inlet cutter is set on the inner surface of the plate 11. As the operation time of dredging elapses, soft sludge is adhered to the cutter 5, and solids formed are broken and fallen down by the cutter 11a on the inner surface of the plate 11 for discharging. The intaking efficiency of soft sludge into the conveyer can thus be raised.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a dredging device used for dredging 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 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.

[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.

[1! Means for Solving the Problem] A vertical screw conveyor and an inlet cutter rotatably provided at the bottom of the vertical screw conveyor and having a plurality of toe-shaped inlet cutters spaced apart by an appropriate distance in the vertical direction on the outer circumferential surface. A dredging device is provided with an inlet device, and a mud collecting plate having a substantially semicircular shape rotatably disposed around the outer periphery of the inlet device, wherein each of the inlets and mud collecting plates are provided on an inner circumferential surface of the mud collecting plate. The structure is such that an auxiliary cutter is interposed and protrudes in the gap between the cutters.

[Function] In the dredging device of the present invention, after the mud collecting plate is rotated to the back side in the dredging direction so as to face each other, the inlet device is driven to rotate and slowly move forward, thereby solidifying the dredged area with the inlet cutter. The soft mud layer is horizontally sheared, stirred,
It is fluidized and introduced into the interior by the suction force generated by the rotation of the screw of the vertical screw conveyor, and is transported upward by the screw.

At this time, the solidified soft mud is cut into slices by the inlet cutter and becomes soft and fluidized.
Foreign matter present in the soft mud cannot pass between the inlet and the cutter and is removed.

The soft mud thus transported upward by the vertical screw conveyor is discharged from the discharge port at the upper end and is transported to the next process.

If the soft mud is hard or sticky, as the operation continues, the soft mud will adhere to the inlet and cutter itself, and this will develop and clog the spaces between the inlets and cutters at each stage, making it difficult for the soft mud to pass through. This will reduce dredging and transportation capacity.

As a countermeasure for such cases, in the present invention, an auxiliary cutter, which is horizontally protruded from the inner peripheral surface of the mud collecting plate and sandwiched between the inlet and the cutter, destroys and removes these clogged solids. There is.

Embodiment] Hereinafter, the present invention will be described in detail based on the embodiment shown in the drawings.

1 to 3 relate to an embodiment of the present invention, in which FIG. 1 is an overall vertical cross-sectional view, FIG. 2 is a plan view taken along line 1--2 in FIG. 1, and FIG. 3 is a lower side view.

In the figure, 1 is a vertical screw conveyor, 2 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 an inlet device, 5 is an inlet cutter, and 6 is a bearing. , 7 is the girth gear, 8 is the pinion gear, 9 is the electric motor, 1o is the protective cover%
11 is a mud collecting plate, lla is an auxiliary cutter, 12 is a bearing, 1
3 and 14 are chain wheels, 15 is an electric motor, and 16 is a protective cover.

As shown in the figure, the vertical screw conveyor l includes a cylindrical casing 2, a screw rotating shaft 3a that is housed inside the casing 2, and is rotationally driven by an electric motor 3b at the top, and screw blades 3. Soft mud such as sludge is lifted up by the screw blade 3 and discharged from the upper discharge port 2a.

On the other hand, below the casing 2 of the vertical screw conveyor l, a casing 4 of an inlet device that rotates with the same diameter as the casing 2 is suspended via a bearing 6, and an electric motor 9. It can be rotated via a pinion gear 8° and a girth gear 7. At the lower end of the casing 4, an inlet cutter 5 having a tomoe shape as shown in FIG.
A is installed in multiple stages. Inlet cutter 5
As shown in FIG. 2, it is formed into a tomoe shape having a circular saw shape so as to shear the soft mud layer located on the outer periphery by rotation.

Further, a substantially semicircular mud collecting plate 11 is provided on the outer periphery of the casing 4 so as to cover the outer periphery of the inlet cutter 5.
The motor 15 is rotatably driven by an electric motor 15 via a chain wheel 13, 14. 16 is a protective cover for the chain wheel. A flat plate-shaped auxiliary cutter lla is arranged on the inner peripheral surface of the mud collecting plate 11 so as to be inserted into the gap between each inlet cutter 5. llb is a through hole for water passage.

Next, the operation of the dredging device configured as above will be explained.

A dredger equipped with the dredging device of the present invention is transported to a dredging site, stopped, and then adjusted by driving the electric motor 15 so that the mud collecting plate 11 is on the back side in the dredging direction. Thereafter, the vertical screw conveyor l is gently lowered until it lands on the seabed. After the inlet device (specifically, the inlet cutter 5) and the mud collection plate 11 have landed and buried in the soft mud layer of the seabed,
When the electric motor 3b is driven to rotate the screw blade 3, and at the same time the electric motor 9 is driven to rotate the inlet cutter 5, the soft mud layer on the seabed is sheared, stirred, and fluidized, one after another by the suction force generated by the 30 rotations of the screw blade. It passes through the opening of the cylinder 5a and enters the device, is transported upward by the screw blades 3, reaches the upper part of the vertical screw conveyor 1, and is discharged from the discharge port 2.
It is discharged from a and transported to the final destination via a pressure pump installed in the next process and a discharge pipe.

The transportation by the screw blades 3 of the vertical screw conveyor 1 differs from a submersible pump in that it mainly only vertically transports solid soft mud without accompanying much liquid. During this time, foreign matter mixed in the soft layer is blocked by the inlet cutter and prevented from entering the inside.

However, even if there are no foreign substances, solidified soft mud, originally hard soft mud, or highly cohesive soft mud gradually adheres to the outer periphery of the inlet cutter 5 and develops as the operation continues, and ultimately If the inlet cutter 5 is in close contact with the inlet cutter 5, it may cause clogging. If this condition extends over the entire surface of the inlet cutter 5, it becomes difficult for the soft material to pass through, and the amount of water passing through the cutter 5 is extremely reduced, making it difficult to dredge. Capacity is significantly reduced. In order to avoid this situation, an auxiliary cutter lla is always inserted into the gap between each inlet cutter to prevent the formation of clogging.

As explained above, according to the present invention, under normal operating conditions, it is possible to transport only soft mud excluding foreign matter at a high concentration and without much surplus water, and to prevent clogging of the inlet cutter. Since an auxiliary cutter is provided, continuous stable operation can be maintained.

[Effects of the Invention] As described above, according to the present invention, since the soft mud is introduced into the screw conveyor in a state where the surplus water is reduced, there is no need to treat the surplus water, and the cost of the soft mud treatment can be significantly reduced. Become. In addition, an inlet cutter and a mud collecting plate are provided at the lower end of the vertical screw conveyor, which improves the efficiency of taking in the soft particles into the vertical screw conveyor. In addition to ensuring smooth conveyor operation, the auxiliary cutter on the mud collecting plate constantly prevents clogging between the inlet and the cutter, improving maintainability.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the dredging device of the present invention, where Figure 1 is an overall vertical cross-sectional view, Figure 2 is a plan view taken from Figure 1 - n, and Figure 3 is a lower part of the dredging device. FIG. 1 - Vertical screw conveyor, 2...
Casing, 3... Screw blade, 3b.
...Electric motor, 4...Casing of inlet device, 5...
... Inlet cutter, 6 ... Bearing, 7 ... Girth gear, 8 ... Binion gear, 9 ... Electric motor, 10 ... Protective cover, 11...
Mud collection plate, 11a... Auxiliary cutter, 12... Bearing, 13... Chain wheel, 14... Chain wheel,

Claims (1)

[Claims] (1) A vertical screw conveyor, and an inlet device including an inlet cutter rotatably installed at the bottom of the vertical screw conveyor and having a plurality of tomb-shaped inlet cutters spaced apart from each other by an appropriate distance in the vertical direction on the outer circumferential surface; The dredging device is equipped with a mud collection plate having a substantially semicircular shape and rotatably disposed on the outer periphery of the inlet device, the dredging device having a mud collection plate having a substantially semicircular shape rotatably disposed on the outer periphery of the inlet device, the dredging device having a mud collection plate provided in the gap between each inlet and the cutter on the inner peripheral surface of the mud collection plate. A dredging device equipped with an auxiliary cutter with an intervening protrusion.