JPH0750425Y2 - Dredging device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is used for dredging soft mud such as sludge accumulated on the seabed, power plant intakes, lakes, rivers, ports, etc. It relates to the device.

[Prior Art] Conventionally, when dredging sludge such as sludge deposited on the seabed, a submersible pump is sunk into the sludge layer to suck up the sludge, or a grab bucket is used to scoop the sludge from the seabed. It was done by.

[Problems to be solved by the invention] However, in a conventional dredging device using a submersible pump, since the submersible pump cannot dredge high-concentration soft mud, the soft mud is sucked together with seawater. However, there is a drawback that the efficiency of pumping sludge is low and a large-scale apparatus and cost are required for treating the seawater that has been sucked up. On the other hand, the dredging device using a grab bucket has a problem that mud occurs in seawater and secondary pollution occurs.

Therefore, in order to solve such a problem, the applicant of the present application previously applied for a dredging device equipped with an inlet device having a scraping blade or a stirring rod that is rotated coaxially with the screw on the tip side of the vertical screw conveyor. did. However, in this prior application, for example, when the soft mud is solidified, even if the inlet device at the tip of the vertical screw conveyor is thrust into the soft mud, only a hole is formed and the surrounding solidified state is The soft mud was not taken into the vertical screw conveyor, and there was a problem that the soft mud take-in efficiency was poor.

[Means for Solving the Problems] The dredging device according to the present invention is configured such that a plurality of mud stirring devices are provided on the outer periphery of the lower end portion of the vertical screw conveyor.

[Operation] In the dredging device of the present invention, a vertical screw conveyor and a mud stirring device are thrust into the soft mud layer, and the mud stirring device fluidizes and muds a wide range of surrounding mud and takes it into the screw conveyor. . 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 a dredging device according to the present invention, and FIG. 2 is an enlarged sectional view taken along the line II-II of FIG. The vertical screw conveyor 1 is configured to include a cylindrical tubular body 2 and a screw 3 rotatably housed in a screw shaft 3a in the tubular body 2, and the screw 3 allows sludge to be removed. It is designed to lift soft mud. 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.

A plurality of mud agitating devices 5 for agitating and fluidizing the surrounding soft mud are provided at a plurality of locations on the outer periphery of the lower end of the vertical screw conveyor 1.
Is provided. This mud agitator 5 is connected to the agitating shaft 6 arranged outside the tubular body 2 in parallel with the screw shaft 3a and to the upper end side of the agitating shaft 6 and attached to the tubular body 2 via a bracket 7. Motor 8 and stirring blades 9 fixed to the lower end side of the stirring shaft 6 and provided in a plurality of vertical stages
It is configured with and.

As shown in FIG. 2, the agitating blade 9 has a plurality of panel blades made of a substantially horizontal flat plate having a toe-like shape and arranged at substantially equal intervals in the vertical direction, and each panel blade is not continuous. It is intermittently fixed to the stirring shaft 6. Further, as shown in FIG. 1, one end of the panel blade is slightly inclined upward and the other is slightly inclined downward.

A relatively large window 10 through which mud passes is provided on the side surface of the cylindrical body 2 where each mud agitator 5 is located laterally.
The lower end of 3a is supported by a bearing portion 11 provided on the lower surface 2a of the tubular body 2. The stirring shaft 6 is rotatably supported by a bracket 12 and a bearing 13 that extend from the cylindrical body 2 provided directly above the mud stirring device 5.

Next, the operation of the dredging device thus configured will be described.

First, the vertical screw conveyor 1 and the mud stirring device 5 are thrust into the soft mud layer, and then the motor 4 and the motor 8 are driven. At this time, as shown in FIG. 2, the rotation directions of the motors 4 and 8 are set so that the screw 3 and the stirring blade 9 rotate in opposite directions to each other, and rotational driving is performed (arrow A indicates the rotation direction of the screw 3, arrow B indicates the stirring blade). 9 rotation direction).

When the stirring blade 9 and the screw 3 start to rotate,
The soft mud located around the vertical screw conveyor 1 is stirred and fluidized by the stirring blades 9 and taken into the vertical screw conveyor 1 by the stirring blades 9. At this time, even if the surrounding soft mud is solidified, it is surely stirred and fluidized by the stirring blade 9 to be in a fluidized state and efficiently taken into the vertical screw conveyor 1.

The soft mud taken into the vertical screw conveyor 1 is vertically conveyed in the cylinder 2 by the screw 3 and discharged to the outside through the discharge port 14.

With this operating state maintained, that is, with the vertical screw conveyor 1 and the mud agitator 5 thrusting into the mud layer and rotating, any one of front, rear, left, and right 1
By swirling in the direction, front and rear, right and left, or moving in a circular arc, the sludge in the forward direction is stirred and fluidized by the stirring blade 9 and can be efficiently taken into the vertical screw conveyor 1. At this time, the agitation blades 9 of the plurality of mud agitation devices 5 can further promote the agitation fluidization of the soft mud over a wide range around the vertical screw conveyor 1, thereby significantly improving the intake efficiency of the soft mud. Has the effect. Also,
The soft mud is reliably taken in regardless of the traveling direction of the vertical screw conveyor 1.

It should be noted that the stirring blade 9 in the direction opposite to the traveling direction of the vertical screw conveyor 1 may be prevented from rotating. On the other hand, a motor 8 for rotating each stirring blade 9
It is also possible to provide only one and simultaneously rotate all the stirring blades 9 via a gear device or the like.

Furthermore, the mud agitator 5 around the vertical screw conveyor 1
The number may be two, or five or more.
Further, the stirring shaft 6 of each mud stirring device 5 does not necessarily have to be provided on the same circumference.

[Effects of the Invention] As is clear from the above description, according to the present invention, since a plurality of mud agitating devices are provided on the outer periphery of the lower end of the vertical screw conveyor, even if the surrounding soft mud is solidified. Even if it is, it is fluidized with stirring in a wide range by the operation of each mud stirring device. Therefore, as compared with the prior art, it has an effect that the efficiency of taking in the soft mud into the screw conveyor and the dredging capability can be improved. Further, the soft mud can be reliably taken in regardless of the traveling direction of the vertical screw conveyor.

BRIEF DESCRIPTION OF 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. 1 ... Vertical screw conveyor, 4, 8 ... Motor, 5 ... Mud stirring device, 9 ... Stirring blade.

Claims (1)

[Scope of utility model registration request] 1. A dredging device comprising a vertical screw conveyor and a plurality of mud agitating devices arranged on the outer periphery of the lower end of the vertical screw conveyor, wherein the mud agitating device is the vertical screw. A stirring shaft having a substantially horizontal paddle blade arranged in parallel with the screw shaft of the conveyor and arranged in a plurality of stages in the vertical direction is fixed to the lower end of the stirring shaft, and a rotation driving means for the stirring shaft. Dredging device.