JPH01151624A - Device for removing obstacles from dredged soil for grab pump dredger - Google Patents

Abstract

PURPOSE:To make automatic and sure removal of obstacles, including stones and rocks or sunken woods, possible, by installing the first and the second sorting grates in a two-stage construction over a hopper which receives thrown-in dredged soil, and by making the upper grate being capable of free turning. CONSTITUTION:When soil dredged by a grab bucket is thrown down on the first sorting grate 11, soil and gravels, smaller in the size than the lattice space of the first sorting grate 11, are dropped on the second sorting grate 12 and obstacles including stones and rocks or sunken woods, larger in the size than the lattice space of the first sorting grate, remain on the first sorting grate 11. Of the soil dropped on the second sorting grate 12, pebbles and sand, smaller in the size than the lattice space of the second sorting grate 12, drop into a hopper 5 placed beneath. The obstacles on the first sorting grate 11 are removed by turning the grate laterally, and the obstacles remaining on the second sorting grate 12 are removed sideward after being raked up by a scraper 25.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a grab pump dredger that removes foreign matter, rocks, etc. from dredged soil using a grab bucket so as not to impede the pumping of dredged soil. The present invention relates to a device for removing obstacles.

(Conventional technology) Conventionally, when dredging sediment that has accumulated at the bottom of a dam, a method has been adopted in which the dredged sediment is transported by pump, and in this case, it is necessary to remove obstacles that impede pump transportation. The following methods are available for selecting and moving obstacles.

First, the sorting methods are: ■ using a fixed grizzly with a horizontal or inclined surface, ■ using a vibrating grizzly that vibrates the grizzly, ■ using a trommel with a mesh-like rotating body, and ■ using a trommel with a net-like rotating body. There are methods such as using a vibrating sieve.

In addition, methods for moving the remaining obstacles include: (1) placing a grizzly on an incline and moving it by applying vibrations; and (2) moving the feeder itself.

(Problems to be Solved by the Invention) However, submerged water of various shapes and weights such as tree roots, trunks, and twigs are mixed in the sediment deposited in the dam.

There was a problem in that they got stuck in the grizzly bars and meshes of the sorting machine in a complicated and irregular manner, making it difficult to remove them, requiring a great deal of effort to remove the obstacles, and reducing the efficiency of dredging.

In addition, if the permeation gap of Grizzriver or the mesh was made larger, it would be somewhat easier to remove the sunken wood that got stuck in it, but small and medium-sized sunken wood would be mixed in with the permeated earth and sand.
There is a problem in that it causes harmful effects on pump transportation.

In view of these conventional problems, the present invention provides a device for removing obstacles during dredging and crushing of soil by a grab-pump dredger, which automatically and accurately removes obstacles such as submerged water and rocks. It is intended for the purpose of providing.

(Means for Solving the Problems) A feature of the present invention for solving such conventional problems and achieving the intended purpose is that dredged earth and sand are pumped together with water using a grab bucket. A first sorting grid and a second sorting grid having a smaller permeation gap than the first sorting grid are arranged in two stages above and below on the dredged material input hopper of a grab pump dredger, and the first sorting grid on the upper side is placed on one side. An obstacle during dredging and crushing of a grab pump dredger, which is rotatable around a side edge and is equipped with a scraper placed on a second sorting grid on the lower side and scraping the surface of the grid while moving along the upper surface of the second sorting grid. It exists in the removal device.

(Function) When dredged soil is dropped onto the first sorting grid using a grab bucket, the soil and small lumps that are smaller than the gap between the first sorting grid are dropped onto the second sorting grid, and the larger ones are dropped onto the second sorting grid. Obstacles such as rocks and sunken wood are left on the first sorting grid. Only the soil that falls onto the second sorting grid is smaller than the permeation gap, that is, the size that does not interfere with pumping, is dropped into the lower hopper, and small lumps are left on the second sorting grid. .

Also, obstacles on the first sorting grid are removed by rotating the first sorting grid laterally.

Further, obstacles left on the second sorting grid are scraped off by a scraper and removed laterally.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings.

In Figure 1, 1 is the hull of a grab pump dredger. A crawler crane 2 is mounted on the hull 1, and a grab bucket 4 is suspended from the crawler crane 2 via a winch 3, and the grab bucket 4 is lowered to excavate earth and sand at the bottom of the water. It is lifted up and dropped onto the earth and sand input hopper 5 at the center bottom of the hull 1.

A suction head 6 is inserted into the earth and sand input hopper 5 to stir the earth and sand together with water to form a slurry and suck it, and the slurry sucked from the suction head 6 is pumped to a distant place by a pump 7.

An obstacle removal device A is provided on the earth and sand input hopper 5 of the grab pump dredger constructed as described above for removing obstacles that interfere with pressure feeding by the pump 7.

This obstacle removing device A will be explained below with reference to FIG. 2 and the subsequent drawings.

This obstacle removing device A has a first sorting grid 11 and a second sorting grid 12 arranged above and below.

The first sorting grid 11 is connected to the hull 1 as shown in FIGS. 2 and 3.
A rectangular turning frame 14 supported on a pedestal 13 erected in
Inside this rotating frame 14, a large number of roller-shaped grid pars 15 are arranged parallel to each other and spaced apart from each other at regular intervals, and each of them is horizontally suspended so as to be freely rotatable. The spacing between the grid pars 15 is such that large and medium sleepers and rocks cannot pass through, but small lumps that pose an obstacle to pumping can pass through. Further, a vibrator 16 is fixed on the rotating frame 14.

One side edge of the rotating frame 14 is fixed to a support shaft 17. The support shaft 17 is rotatably supported on the pedestal 13 by a bearing 18, and is supported by guard motors 19 provided at both ends.
As a result, the rotating frame 14 is rotated from the position shown by the solid line in FIG. 3 to the side as shown by the overhead wire.

In addition to this, a hydraulic cylinder may be used as the driving means for the rotating frame 14.

Although not shown, the first sorting grid uses a rectangular grid par instead of the roller-shaped grid par 15 described above, which is oriented in the direction of the rotation radius of the rotation frame 14, and both ends of the grid par are connected to the rotation frame 14. 14 by a robust fixing method.

The second sorting grid 12 is arranged below the first sorting grid 11, and includes a pair of slightly inclined guide rails 20.
In between, there are a number of fixed grid pars 21 supported in a parallel arrangement, and a number of rotating grid pars 22 supported in a perpendicular arrangement below the fixed grid par 21. 22 is a support shaft 22 having a triangular cross section and protruding from both ends as shown in FIG.
a is supported on a support beam 23. In addition, each of the fixed grid pars 21 and the rotating grid pars 22 has a permeation gap that prevents the passage of even small lumps that have passed through the second sorting grid 12, and there is a gap at the bottom that is large enough to not interfere with pumping. The spacing is such that only earth and sand can pass through.

A flat chute 24 is fixed between the guide rails 20 at the upper end side extension of the fixed grid par 21. A scraper 25 is provided that reciprocates from the lower end of the fixed grid par 21 to the upper end of the chute 24.

This scraper 25 consists of a support frame 27 that is hung between a pair of carts 26 running on each guide rail 20, a rock removal plate 28 made of a metal plate fixed under the support frame 27, and a rubber plate fixed to the lower end of the support frame 27. It is made up of a scraping plate 29 made of aluminum, and is reciprocated by the drive of a pair of chains 30 arranged on the outside of both guide rails 20.

As shown in FIG. 5, the scraping plate 29 has a straight lower end and a slit 29a in one portion. In addition, as shown in FIG. 7, sawtooth-like unevenness 29b may be provided on the lower edge.

The chain 30 is wound between sprockets 31a and 31b, and is operated by rotationally driving a sprocket drive shaft 32 by a speed-adjustable hydraulic motor 33.

Reference numeral 34 in Fig. 1 is a cleaning water injection nozzle, which injects a large amount of water at a higher pressure to promote passage of the dirt accumulated on the first and second sorting grids between the grids.

In the obstacle removal device A configured as described above, the dredged soil dropped from the grab bucket 4 is vibrated by the vibrator 16 on the grid par 15 of the first sorting grid 11, and is removed from large and medium-sized blocks. Books are grid par 1
5, and the soil containing small lumps is dropped downward.

In the second sorting grid 12, small lumps are left on the fixed grid par 21 and the rotating grid par 22, and only earth and sand of a size that does not impede pumping is thrown into the earth and sand input hopper 5 below.

On the other hand, impurities such as sunken wood remaining on the grid par 15 of the first sorting grid 11 and obstacles such as large and medium rocks can be removed by rotating the first sorting grid 11 around the spindle 17.
It is dropped onto the chute 24. At this time, since each grid par 15 is constituted by a rotatable roll, the grid pars 15 are smoothly dropped without getting stuck between the grid pars 15.

Further, the obstacles remaining on the second sorting grid 12 are scraped off by the movement of the scraper 25, and are loaded onto another carrier (not shown) from the chute 24 and transported.

At this time, since the rotating grid par 22 is used on the lower side, the obstacle can be smoothly moved by the scraper 25. Furthermore, by sliding the scraper 25 downward from above the chute 24, obstacles remaining on the fixed grid par 21 and the rotating grid par 22 are scraped downward.

It is dropped into the water from the gap between the hull 1 and the hopper 5.

(Effects of the Invention) The device for removing obstacles during dredging and crushing of a grab pump dredger according to the present invention is configured as described above, and the upper and lower stages are sorted into two stages by the first and second sorting grids. Obstacles remaining on the first sorting grid in the first stage are removed by rotating the entire sorting grid to another location, which ensures the removal of large and medium-sized obstacles. Easily eliminated without getting stuck in between. In addition, since the soil after large and medium-sized obstacles are removed is dropped onto the second sorting grid in the second stage, small-sized obstacles are reliably removed. Since the obstruction is only a small lump, it can be easily removed with a scraper, and the movement to separate and remove the obstruction as a whole is
Dredging can be done accurately and quickly without the need for manpower, and dredging workability has been significantly improved.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a side view showing a grab pump dredger, FIG. 2 is a plan view of the obstacle removal device, and FIG. m-line cross-sectional view,
FIG. 4 is a partial perspective view of the second sorting grid, FIG. 5 is a front view of one example of the scraper, FIG. 6 is a vertical sectional view of the same, FIG. 7 is a front view of another example of the scraper, and FIG. 8 is the same. FIG. A: Obstacle removal device, 1: Grab pump dredger, 4: Grab bucket, 5:
... Sediment input hopper - 16 ... Suction head, 7 ... Pump, 11 ... First sorting grid, 12 ... Second sorting Lattice, 14...
- Rotation frame, 15...Grid bar, 16...
... Vibrator, 17... Support shaft, 19...
... Guard motor, 20 ... Guide rail, 21 ... Fixed grid bar, 22 ...
...Rotating grid bar, 25...Scraper.

Claims (1)

[Claims] A first sorting grid and a second sorting grid, which has a smaller permeation gap than the first sorting grid, are arranged in upper and lower stages on the dredged sand input hopper of a grab pump dredger that pumps dredged earth and sand together with water using a grab bucket. The first sorting grid on the upper side is rotatable around one side edge thereof, and the second sorting grid on the lower side is provided with a scraper for scraping the surface of the grid while moving along the upper surface thereof. Obstacle removal device in dredged soil by grab pump dredger.