JPH0720197Y2 - Dredging device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is applicable to, for example, the seabed, power plant intakes, lakes, rivers,
The present invention relates to a dredging device used when dredging sludge such as sludge accumulated in a harbor or the like.

[Prior Art] Conventionally, when dredging sludge such as sludge accumulated on the seabed, the suction port of a pump ship is thrust into the sludge layer to suck up the sludge, or the sludge is scooped from the seabed with a grab bucket. I went by doing.

[Problems to be solved by the invention] However, in the conventional dredging device using a pump ship, since the pump cannot dredge high-concentration soft mud, the soft mud is sucked together with seawater. As a result, the pumping efficiency is poor, and there is a drawback in that a large-scale device and cost are required to treat the seawater sucked up. on the other hand,
The dredging device using the grab bucket has a problem that pollution occurs in the seawater and secondary pollution occurs.

Therefore, in order to solve such a problem, we tried to adopt a vertical screw conveyor, but there was a problem that the softened mud in the solidified state was not taken into the vertical screw conveyor and the efficiency of taking in the soft mud was poor. .

[Means for Solving the Problems] A dredging device according to the present invention is a vertical screw conveyor having a tubular body and a screw coaxially inserted in the tubular body, and a vertical screw conveyor of the vertical screw conveyor. In a dredging device having a soft mud intake device provided on the side of the lower end, the soft mud intake device has a shaft parallel to the vertical screw conveyor on one side of the lower end of the vertical screw conveyor. A mud stirring blade that is rotatably arranged as a center, a cover that covers both sides of the mud stirring blade and that is connected to the lower end of the cylindrical body of the vertical screw conveyor, and above the mud stirring blade. And a rotation drive device for the arranged mud stirring blades.

[Operation] In the dredging device of the present invention, the vertical screw conveyor and the mud stirring blade are thrust into the soft mud layer, the mud around the mud is stirred and fluidized, and the fluidized mud is passed through the cover into the screw conveyor. I am trying to capture it. Therefore, even if the mud is in a solidified state, it can be reliably and efficiently taken in.

[Embodiment] The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of the dredging device according to the present invention, and FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. The vertical screw conveyor 1 has a cylindrical tubular body 2.
The screw 3 is rotatably accommodated in the cylindrical body 2 so that soft mud such as sludge can be lifted by the screw 3. The screw 3 is connected to a motor 4 arranged on the upper end side of the tubular body 2 and is configured to be rotationally driven by the motor 4. Further, a mud stirring device 5 for stirring and fluidizing the surrounding soft mud is provided at one side of the lower end portion of the vertical screw conveyor 1. This mud agitator 5
A stirring shaft 6 disposed outside the cylindrical body 2 in parallel with the screw shaft 3a; a motor 8 connected to the upper end side of the stirring shaft 6 and attached to the cylindrical body 2 via a bracket 7; The stirring blade 9 is fixed to the lower end side of the shaft 6 and is provided with a plurality of vertical stages. In order to take in the sludge fluidized by the rotating stirring blades 9 into the vertical screw conveyor 1, the space between both lateral sides of the stirring blades 9 and the cylindrical body 2 outside the lower end portion of the screw 3 is taken up. cover
The structure is connected by 10. Further, the lower end of the stirring shaft 6 is rotatably supported by a bracket 11 attached to a cover 10.

Next, the operation will be described. First, after the vertical screw conveyor 1 and the mud stirring device 5 are thrust into the soft mud layer, the stirring blade 9 of the mud stirring device 5 is rotated by the drive of the motor 8 (rotation in the opposite direction to the screw 3). In FIG. 2, the arrow A indicates the rotation direction of the stirring blade 9, and the arrow B indicates the rotation direction of the screw 3. Then, the soft mud located around the vertical screw conveyor 1 is agitated and fluidized by the agitating blades 9, and then taken into the vertical screw conveyor 1 by the agitating blades 9. Even if the surrounding soft mud is solidified, it is surely fluidized by stirring by the stirring blades 9 to be fluidized and efficiently taken into the vertical screw conveyor 1.

The soft mud taken into the vertical screw conveyor 1 is vertically conveyed in the cylindrical body 2 by the screw 3 and discharged to the outside through the discharge port 12. When the vertical screw conveyor 1 is moved in the lateral direction with the vertical screw conveyor 1 thrust into the soft mud layer, the posture of the mud stirring device 5 is controlled so as to be positioned in the forward direction (direction of arrow C). As a result, the soft mud on the front side in the traveling direction can be agitated and fluidized by the agitating blades 9 and efficiently taken into the vertical screw conveyor 1.

[Effects] As described above, according to the present invention, the mud stirring blades that are rotatably arranged around the axis parallel to the vertical screw conveyor are provided on one side of the lower end of the vertical screw conveyor. Therefore, even if the surrounding soft mud is in a solid state, it is stirred and fluidized by the operation of the mud stirring device. Therefore,
This has the effect of improving the efficiency of taking in the soft mud into the screw conveyor as compared with the conventional case. In addition, since the drive device for rotating the mud stirring blade is arranged above the mud stirring blade, it is possible to prevent the drive device from contacting the mud on the bottom of the water during dredging, and to perform dredging efficiently. it can. Further, since both sides of the mud agitating blade are covered and a cover which is continuous with the lower end of the cylindrical body is provided, the fluidized mud is reliably taken into the screw conveyor. In addition, it is also possible to prevent water pollution due to the rise of mud on the bottom of the water due to dredging.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the dredging device according to the present invention, and FIG. 2 is an enlarged sectional view taken along the line II-II of FIG. 1 ... Vertical screw conveyor, 5 ... Mud stirring device, 9 ...
… Agitation blade, 10 …… Cover.

Front page continuation (72) Inventor Hiroyasu Nakajima 6-9 Amidaji-cho, Shimonoseki City, Yamaguchi Prefecture Inside Shimonoseki Machinery Maintenance Office, 4th Port Construction Bureau, Ministry of Transport (72) Inventor Kiyoshi Kamioka, Ube City, Yamaguchi Prefecture 1980 Address Ube Machinery Co., Ltd.Ube Machine Works Co., Ltd. (72) Inventor Hoshino Toyouma 1980 Okiyama, Ube City, Ube City, Yamaguchi Prefecture Ube Machinery Co., Ltd. Ube Machine Works Co., Ltd. (72) Inventor, Ryoichi Yamamoto Ube City, Yamaguchi Prefecture Okinoyama 1980 Ube Industries, Ltd. Ube Machinery Co., Ltd. (56) Reference JP 55-7898 (JP, A) JP 50-100834 (JP, A) JP 61-266744 (JP, A) 62-81652 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A vertical screw conveyor having a tubular body and a screw coaxially inserted in the tubular body, and a soft mud intake provided on a side portion of a lower end portion of the vertical screw conveyor. In the dredging device having a device, the soft mud intake device is a mud agitating blade that is rotatably disposed on one side of a lower end portion of the vertical screw conveyor about an axis parallel to the vertical screw conveyor. A cover that covers both sides of the mud stirring blade and is connected to the lower end of the cylindrical body of the vertical screw conveyor, and a rotation driving device for the mud stirring blade that is arranged above the mud stirring blade. A dredging device comprising: