JPS6131080Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, in dredging work using a pump-type dredger, when the thickness of the soil layer to be dredged is large, the excavated soil is damaged due to collapse of the original ground and scattering of the soil backward during excavation with a cutter. tends to accumulate behind the cutter, that is, behind the suction port, reducing dredging efficiency.

The present invention solves the above-mentioned drawbacks, reduces the amount of unabsorbed soil, and provides a device that can perform dredging work efficiently.

The cutter with the earth and sand outflow prevention device for a pump dredger of the present invention is characterized in that a fixed plate larger than the outer diameter of the cutter is provided at the rear of the cutter, and has a movable part on its side that can be expanded and contracted according to a set load.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the conventional apparatus and the apparatus of the present invention will be described below with reference to the drawings.

First, an outline of the dredging state of a conventional pump type dredger will be explained with reference to FIG.

Conventionally, when the thickness of the dredged soil is large, the tip of the cutter 4, suction port 6, and ladder 3 are covered with collapsed soil 2 shown in the shaded area due to the collapse of the original ground 1, and the collapsed soil 2 is covered with the collapsed soil 2 shown in the shaded area. It will flow further backwards. This tendency becomes more pronounced as the cutter 4 rotates, and unabsorbed dirt is generated.
Note that 5 indicates the rotation axis of the cutter.

In the present invention, in order to eliminate such drawbacks, as shown in FIGS. 2 and 3, a fixing plate 7 is provided at the tip of the ladder 3, extending perpendicularly to the axial direction of the ladder 3 and having a larger diameter than the cutter 4. Guide rails 9 extending horizontally are provided on the upper, lower, left and right sides of the fixed plate 7, and the left and right movable parts 8 of the fixed plate 7 are supported by the guide rails 9 via guide rollers 10, respectively, and are slidable in the horizontal direction. .

Also, as shown in FIG. 4, the cylinder body of the liquid cylinder 11 communicates between the fixed plate 7 and the movable part 8 via a conduit 15 to an accumulator 12 in which a gas 13 is sealed in the upper part of the liquid 14. and are connected by a piston rod. The accumulator 12 is installed on the rudder 3 or inside the dredger.

Since the device of the present invention has the above-described configuration, when dredging is performed by repeatedly swinging the rudder 3 alternately to the left and right to increase the thickness of the dredged soil, the liquid cylinder 11 spreads the liquid to the left and right ends of the fixed plate 7 to the maximum extent possible. The fixed plate 7 having a movable part 8 catches the collapse of the original ground 1 and the flow of debris scattered backward due to cutter excavation, and the fixed plate 7
The earth and sand accumulated on the front surface of the movable part 8 are efficiently guided to the suction port 6 by the cutter 4.

According to the present invention, the accumulator 12
By appropriately setting the pressure of the gas inside, the movable part 8 will not be displaced within a predetermined load, but at the end of the left-right swing, that is, at the end of the turn, the movable part 8 will come into contact with the undredged original ground 1 and an excessive load will be applied. When the force is applied, the liquid cylinder 11 contracts and the movable part 8 moves along the guide rail 9 to the center of the rudder 3, so that it does not interfere with the swing and also prevents the movable part 8 from being damaged.

In FIGS. 2 and 3, reference numeral 4a indicates the rotation locus of the cutter 4, and the right side in FIG. 3 shows a state in which the movable portion 8 has moved from the position indicated by the chain line to the position indicated by the solid line.

It goes without saying that in other embodiments of the present invention, instead of using the accumulator 12 and the liquid cylinder 11, a spring of desired strength may be inserted between the fixed plate 7 and its movable part 8.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the dredging state of the pump dredger, Fig. 2 is a side view of the cutter of the present invention, Fig. 3 is a sectional view taken along the line A-A of Fig. 2, and Fig. 4 is the liquid cylinder and the cutter of the present invention. FIG. 2 is an explanatory diagram showing the relationship between accumulators. 1... Original ground, 2... Collapsed earth and sand, 3... Ladder, 4... Cutter, 5... Rotating shaft, 6... Suction port, 7... Fixed plate, 8... Movable part, 9... Guide rail, 10... Guide roller, 11...
Liquid cylinder, 12...accumulator,
13...Gas, 14...Liquid, 15...Conduit.

Claims (1)

[Scope of utility model registration request] A cutter with a sediment outflow prevention device for a pump-type dredger, characterized in that a fixed plate larger than the outer diameter of the cutter is provided at the rear of the cutter and has a movable part on its side that can be expanded and contracted according to a set load.