JPH02204535A - Dredging device - Google Patents

Abstract

PURPOSE:To smoothen actuation of a vertical type screw conveyor by providing the vertical screw conveyor, a blow which is integrated with a screen, and a squeeze pump which is connected to the discharge opening of the conveyor, and a discharge feed pipe. CONSTITUTION:A blow 5 located at the end of a vertical type screw conveyor 1 is inserted into sludge, and a driving device for a screw 3, and a motor 15 are rotated simultaneously. The blow 5 is then rotated via a rotating tube 6 so that an inner blade 8 and outer blade 9 take sludge into the tube 2 via the blow 5. Foreign materials contained in the sludge are catched by a screen 11 and discharged to the outside along the rake surface. The sludge guided into the tube 2 is forced to rise within the tube 2 by rotation of the screw 3 and is discharged from a discharge opening 2a and thereafter sent to a discharge feed pipe 21 via a squeeze pump 20.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to dredging, which is used, for example, to dredge soft mud such as sludge accumulated in water intakes of power plants, seabeds, lakes, rivers, ports, etc. It is related to the device.

[Conventional technology] Conventionally, to dredge soft mud such as sludge deposited on the seabed, a submersible pump is inserted into the soft mud layer to suck up the soft mud, or a grab/kerat is used to scoop up the soft mud from the seabed. This was done by doing this.

[Problems to be Solved by the Invention] However, in dredging using conventional submersible pumps, the submersible pumps cannot dredge high-concentration soft mud, so soft mud is sucked together with seawater. ,
As a result, the pumping efficiency is poor, and treatment of the sucked up seawater requires large-scale equipment and costs. On the other hand, dredging methods using grab buckets have the problem of creating turbidity in seawater and causing secondary pollution.

Therefore, in order to solve this problem, we developed a vertical screw conveyor, an inleft device rotatably installed at the tip side of the vertical screw conveyor, and a discharge device installed at the discharge port of the vertical screw conveyor. It was considered to use a dredging device equipped with a pipe. However, this vertical screw conveyor is difficult to use when transporting soft mud over long distances.
There has been a problem in that it is difficult to smoothly transfer the material within the discharge pipe using only the force of the vertical screw conveyor.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the dredging device of the present invention includes a vertical screw conveyor, and a dredging device rotatably provided on the tip side of the vertical screw conveyor, with a predetermined downward direction of -L. A plow equipped with a plurality of screens disposed at intervals, a scraping blade integral with the screen and disposed in a direction crossing the screen, and a plow connected to the discharge port of the vertical screw conveyor. It consists of a squeeze pump and a discharge pipe.

Furthermore, in the second aspect of the invention, in addition to the above configuration, an ejector is provided between the squeeze pump discharge port and the exhaust pipe for feeding compressed air into the exhaust pipe.

[Function] In the dredging device of the present invention, the soft mud around the intake portion is stirred by the rotation of the plow, and while fluidization is further promoted, the soft mud is taken into the vertical conveyor by the scraping blade.

At this time, foreign substances mixed in the soft mud are prevented from entering by the screen. The soft mud that enters the vertical screw conveyor reaches the discharge port by the pumping action of the screw, is discharged from the discharge port, is pressurized by the following squeeze pump, and is discharged to shore or to the hold of a carrier ship via the discharge pipe. Get muddy.

Further, in the second air 11, after passing through the squeeze pump, the compressed air sent in from the ejector causes the air to flow as a plug flow, thereby achieving smooth transportation over a longer distance.

[Example] Hereinafter, the present invention will be described in detail using examples shown in the drawings.

Fig. 1 is a cross-sectional view of essential parts showing one embodiment of the dredging device according to the present invention, Fig. 2 is an enlarged front view of the plow, Fig. 3 is a cross-sectional view taken along the line 1 in Fig. Partially enlarged vertical cross-sectional view of Figure 1,
FIG. 5 is a sectional view taken along the line V-V in FIG. 1.

The vertical screw conveyor l includes a cylindrical body 2 and a screw 3 rotatably housed within the body 2. The screw 3 lifts soft mud such as sludge. It is now possible to do so. The screw 3 is
It is connected to a motor (not shown) disposed on the upper end surface of the cylindrical body 2, and is configured to be rotationally driven by the motor.

A plow 5 having digging and stirring functions is provided at the tip of the vertical screw conveyor I.

This plow 5 is rotatably provided coaxially with the screw 3, and includes a rotary cylinder 6 rotatably provided on the outer periphery of the cylinder body 2, a rotary cylinder 6' also having the same diameter as the cylinder body 2, and A canopy-shaped casing 7 fixed to the outer periphery of the rotating cylinder 6', an inner blade 8 and an outer blade 9 for scraping extending downward from the casing 7, and the blades 8, 9.
The structure includes a plurality of screens 11 arranged horizontally so as to be perpendicular to the screen and spaced apart from each other by a predetermined distance in the vertical direction, and having a rake 10 on the outer circumferential side.

As shown in detail in FIG. 3, the inner blade 8 is provided with a bracket (8a) disposed around the screw 3 provided on the screw shaft 3a and extending in the radial direction.
is connected to the plow 2 3A for the end bearing of the screw 3.

The outer blade 9 is arranged around the inner blade 8, and the rotation of the inner blade 8 and the outer blade 9 draws surrounding soft mud into the cylinder body 2.

The screen 11 is for preventing large rocks and foreign objects from entering the cylinder 2 through the plow 5.
As shown in FIG. 3, the blades 8 and 9 are each fixed to the screen 11 by welding.As shown in FIG. The screen 11 is slightly bent in the vertical direction, and the screen 11 rotates while digging with teeth to prevent foreign matter from clogging.

As shown in FIG. 1, the rotary cylinder 6 and the rotary cylinder 6' are mounted coaxially with the cylinder body 2 of the vertical screw conveyor 1 and rotatable around the axis.

Further, a rack gear 12 is provided around the upper part of the rotary cylinder 6, and the rack gear 12 is connected to a pinion gear 1.
It is in constant mesh with 3. This pinion gear 13 is fixed to the lower end of a drive shaft 14 extending along the side surface of the cylindrical body 2 . Also.

The upper end of the drive shaft 14 is connected to a motor 15 disposed on the upper side of the cylindrical body 2, and the drive shaft 14 is driven by the motor 15. The rotary cylinder 6 is rotatably driven via a pinion gear 13 and a rack gear 12. The rotary cylinder 61 and the plow 5 suspended thereon are rotatably supported by a thrust bearing 16 attached to the cylinder body 2. Further, as shown in FIG. 4, the lower end of the cylinder 2 is provided with two stages of gland packings 6a and 6b to prevent water from entering into the double cylinder, similar to the upper gland packing 17.

On the other hand, there is a soft mud discharge port 2a above the cylindrical body 2, and a squeeze pump 20 is connected downstream of the discharge port 2a via piping.

The squeeze pump 20 is conventionally marketed as a tube pump, and as shown in FIGS. 1 and 5, a highly elastic tube 20a is curved into a U-shape to form a drum 20b.
and held between a pair of guide rollers 20e. Then, by rotating a rotating body 20c with two extrusion rollers 20d pivotally supported at both ends by an electric motor (not shown) via a rotating shaft 20f, the tube 20a is gradually crushed and transported. A fixed amount of material is discharged to the upstream side. In this case, the arc of the locus of the extrusion roller 20d and the center of the U-shaped arc of the tube 20a are made eccentric.

Further, a discharge pipe 21 is connected downstream of the squeeze pump 20, and an ejector 22 for supplying compressed air is attached to the discharge pipe immediately after the squeeze pump 20 obliquely toward the downstream direction.

Next, the operation of the dredging device configured as above will be explained. The drive device of the dredger (not shown) is activated to insert the plow 5 located at the tip of the vertical screw conveyor l into the soft mud at the bottom of the water, and at the same time the drive device of the screw 3 (not shown) is rotated and the motor 15 is activated. Rotate. The rotation of the motor 15 also rotates the plow 5 via the rotary cylinder 6, and while the rotation of the plow 5 stirs and fluidizes the soft mud around the intake section, the inner blade 8 and the outer blade 9 Soft mud is taken into the cylinder body 2 through the plow 5. At this time, foreign matter mixed in the soft mud is prevented from entering the plow 5 by the screen 11, and is discharged to the outside along the rake 10 surface. .

On the other hand, the soft mud introduced into the cylinder 2 from inside the plow 5 rises inside the cylinder 2 by the rotation of the screw 3, is discharged from the discharge port 2a, and is then sent to the squeeze pump 20 downstream. Thereafter, after passing through the squeeze pump 20 by driving the squeeze pump 2o, it is fed to the discharge pipe 21 at a constant discharge rate. Further, in the second invention, compressed air from a compressed air supply device (not shown) is blown into the ejector 22 attached to the exhaust pipe 21.

As a result, in the discharge pipe 21, the transported materials such as sludge or soft sludge are arranged in such a manner that the mass of the transported material and the mass of air intersect with each other.
A normal transport state is 0 or more that is transported through the discharge pipe in a so-called plug ψ flow state.

However, the specific gravity and moisture content of the transported materials may change due to a change in the location of the cargo, resulting in a temporary increase in piping resistance, or the transport distance may change, forcing longer-distance transport than before. Even when this occurs, the squeeze pump is used as the pressurizing drive source as shown in Figure 1, so the transported material can be quantitatively ejected, and in the second invention, the subsequent ejector By blowing in compressed air, a stable plug flow is formed, making it possible to stabilize mixed pumping.

The soft mud is then discharged to a designated location.

As explained above, in the dredging device of the first invention, the lower end of the vertical screw conveyor and the inlet device are plunged into the soft mud layer, and the inlet device promotes the fluidization of the soft mud layer, and the dredging device is inserted into the screw. A vertical screw conveyor lifts the soft mud at a high level, and it is discharged from the discharge port, pressurized by a squeeze pump, and discharged onto land or into a ship's hold via a discharge pipe.

In addition, in the dredging device of the second invention, by sending compressed air from the ejector, the soft mud flows as a plug flow, and is smoothly transported over a long distance. Since the energy of is utilized the expansion energy of compressed air, the pressure at the squeeze pump discharge part is smaller in the case of the dredging device of claim 2 than in the case of claim 1 for the same discharge distance, Further, it becomes possible to discharge the material over a longer distance.

[Effects of the Invention] As described above, according to the present invention, the soft mud is introduced into the screw conveyor in a state where surplus water is reduced, so that it is possible to significantly reduce the cost of soft mud processing.

In addition, since a rotatable plow equipped with a scraping blade and a screen is provided on the tip side of the screw conveyor, fluidization is further promoted, so the efficiency of taking soft mud into the screw conveyor is improved. Moreover, it prevents foreign objects from entering the screw conveyor! ]2, ensuring smooth operation of the screw conveyor.

In addition, a squeeze pump is installed immediately after the vertical screw conveyor to quantitatively and forcibly feed the soft mud to the discharge pipe, so the properties of the transported material may change or the transport distance may be extended. Even if the conditions deteriorate, stable, fixed-quantity supply can be achieved.

In addition, in the second invention, compressed air is further blown into the discharge pipe after the squeeze pump through an ejector, and the soft mud can be mixed and pumped by plug flow, so it can be transported stably over longer distances. transportation can be realized.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing one embodiment of the dredging device according to the present invention, Fig. 2 is an enlarged front view of the plow, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 4 is FIG. 5 is a partially enlarged cross-sectional view of the lower end of the cylindrical body, and FIG. 5 is a cross-sectional view taken along the line v--v in FIG. 1. 1... Vertical screw conveyor, 2... Cylindrical body, 5... Plow 6.6゛・
...Rotating tube, 8...Inner blade, 9...
Outer blade, 11... Screen, 20... Squeeze pump, 21... Discharge pipe, 22... Ejector. No. 1rIIJ Patent Applicant Ube Industries Co., Ltd.

Claims (2)

[Claims] (1) A vertical screw conveyor, a plurality of screens which are rotatably provided on the tip side of the vertical screw conveyor and are arranged at predetermined intervals in the vertical direction, and which are integral with the screen and are attached to the screen. A dredging device comprising: a plow having scraping blades disposed in cross directions; and a squeeze pump connected to a discharge port of the vertical screw conveyor and a discharge pipe. Device. (2) The dredging device according to claim 1, further comprising an ejector between the squeeze pump discharge port and the discharge pipe for feeding compressed air into the discharge pipe.