JPS59661B2 - dredging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dredging device that can obtain an optimal cutter posture in response to the undulations and arbitrary depth of hard soil.

Conventionally, cutter and suction dredging methods have been widely adopted for dredging soft soil, but when dredging hard soil, the force of the cutter's pressure against the soil increases, resulting in more aggressive excavation than when excavating soft soil. However, as the excavation force increases, the required driving force of the cutter increases as a reaction force, and special consideration must be given to the strength of the excavation moving device of the cutter and the ladder that supports the cutter. For this reason, the conventional cutter suction dredging method for soft soil has the disadvantage that the amount of excavation must be limited when excavating hard soil, resulting in a significant drop in excavation efficiency compared to when excavating soft soil. are doing.

In order to eliminate this drawback, the present invention employs a dual cutter having two cutters that rotate in opposite directions.
The present invention provides a dredging device that is most suitable for the dual cutter.

To explain the drawings below, the rear end of the rudder 1 is pivoted to the dredger V at the pivot point 2 so that it can be lifted up and down, and the tip of the rudder 1 and the upper end of the banger 3, and the lower part of the banger 3 and the tension rod 4 parallel to the rudder. The tip, the rear end of the tension rod 4, and the dredger ■ are connected to pivot points 5 and 6, respectively.
, 7, and the rudder 1, banger 3, tension rod 4, and dredger V are pivoted at the four pivot points 2, 5,
The distance between the respective pivot points is selected so that the quadrilateral connecting the parts 6 and 7 becomes a parallelogram, and the cutter support 8 is attached to the lower end of the banger 3 with a shaft 9 so as to be swingable in the horizontal turning direction, which is the excavation direction. two equal cutters 10, 10 are pivotally connected to the support 8.
' is rotatably arranged at a symmetrical position about the axis 9, and the cutter shirt N1 of the cutter 10°10'
, 11' have drive devices 12 that rotate in opposite directions.
, 12' are provided, and a suction port 14 of a suction pipe 13 is opened via a flexible hose near the cutters 10, 10', and suction is carried out by a dredging pump (not shown) or the like.
The earth is sent from the earth discharge pipe 15 to a desired location via a swivel pipe 16.

The banger 3 can be moved up and down by operating the wire R etc. with a winch 17 etc. on the ship, and the dredger V moves the rudder 1 while rotating around a spud 18 set up on the dredging soil. It is rotated horizontally and excavation work is performed in the circumferential direction using cutters 10 and 10' at the tip of the ladder.

A cylinder device 19 is inserted into the rear of the tension rod 4 to finely adjust the length of the tension rod 4. However, during normal hard soil excavation, the cylinder is held in the neutral position and the lengths of the rudder 1 and the tension rod 4 are adjusted. The inclination angle of the cutter can be changed by operating the cylinder device 19 as appropriate to facilitate the replacement of the cutter 10 or to make fine adjustments to the excavated soil. be.

The force with which the cutters 10, 10' press against the hard soil platform K is based on the weight of this device, and the pressing force is adjusted using the wire R.
This is done by operating the wire H to bear the weight of the device.

Since only tension is applied to the tension rod 4, and compressive force and bending moment are applied to the rudder 1 in the excavation direction, the tension rod 4 and the rudder 1 are designed to withstand the respective loads.

In the embodiment of the present invention, the swinging mechanism of the cutter is combined with the parallel link mechanism of the ladder, but the swinging mechanism of the cutter may be combined with a conventional ladder.

The present invention has the above configuration and has the following effects.

(1) In conventional dredging equipment, the number of cutter teeth that effectively excavate the soil was a fraction of the total number of teeth.

This is because the inclination angle of the cutter attached to the rudder changes as the inclination angle of the rudder changes depending on the dredging depth, so the cutter teeth have to be planted in a hemispherical shape at the tip of the cutter shaft. It is.

However, the hanger 3 of the dredging device of the present invention mechanically constitutes a rank mechanism parallel to the rudder 1, the tension rod 4, and the hull (2), and the hull, which is a link facing the hanger 3, is a relatively fixed link. Therefore, the hanger 3 always maintains a constant posture regardless of the elevation angle of the ladder 1, and therefore the vertical projection angle of the cutters 10, 10' with respect to the horizontal plane is always constant, regardless of the dredging depth and the undulation of the soil. The cutter touches the soil at a fixed angle.

Therefore, it is possible to easily employ a cutter in which all teeth can effectively contact the soil.

That is, if a cutter with a trapezoidal cross section in the axial direction is adopted as shown in the figure, all the blades can be effectively grounded on the soil.

(2) Since the cutter support 8 of the present invention is pivotally connected to the hanger 3 and can swing freely in the excavation direction, the cutter support 8 can freely swing around the shaft 9 according to the ups and downs of the soil. The two cutters 10, 10' provided on the support and rotating in opposite directions can be effectively grounded, allowing the two cutters 10.degree. and 10' to share an equal load.

That is, when a larger excavation load is applied to only one cutter, the cutter rotates in a direction in which the load is reduced based on the reaction force, and as a result, the load is equally shared between the double-edged vines 10 and 10'.

By sharing the same load with the double-edged vines 10 and 10', the excavation reaction forces of the double-edged vines rotating in opposite directions are canceled out, and the capacity of excavation moving devices such as anchors can be reduced, reducing the need for dredging equipment. Improves operability and durability.

Also, since the double-edged vines can both touch the ground, suction pipe 1
The suction port No. 3 opens at the optimum position, which has the effect of enabling efficient dredging work.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the dredging device of the present invention, Fig. 2 is a side view of the main parts near the banger 3, and Fig. 3 is a cutter 10,
It is explanatory drawing which each shows the front view of the principal part near 10'. 1... Rudder, 2... Pivot point, 3...
...Hanger, 4...Tension rod,
5-7... Pivot point, 8... Cutter support, 9... Shaft, 10... Cutter,
11...Cutter shaft, 12...
Drive device, 13...Suction pipe, 14.
...Suction port, 15...Discharge pipe, 16...
... Swivel tube, 17 ... Winch, 18
...Spud, 19...Ulinda device.

Claims (1)

[Claims] 1. A rudder is pivotally attached to the hull so that it can be lifted up and down, and a cutter support is pivotally attached to the banger at the tip of the rudder so that it can swing freely in the horizontal rotation direction of the rudder, which is the excavation direction, and the cutter support is symmetrical with respect to the center of swing. A dredging device equipped with cutters that rotate in opposite directions at different positions.