JPS5852876B2 - Swing winch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anchor wire payout control method for a swing winch used in a cutter type dredger to prevent hull relocation due to the rotational force of the cutter head. An object of the present invention is to provide a control method that is automatically performed without impairing operating efficiency during normal operation, instead of the control method that relies on intuition.

Figure 1 shows an outline of a two-motor, two-drum swing winch type cutter dredger.

Normally, the circumferential speed of the cutter head 6 is 2 to 5 times faster than the swing speed of the cutter head, and depending on the soil quality, the hull swings due to the rotation of the cutter head 6 regardless of the swing tension of the swing winch. It's going to happen.

This is called transfer by cutter. Swing wire 7 or 8 on the opposite side of the swing direction to prevent this transfer
The control that applies tensile force to the dredger is called swingback tension control in dredging vessels, and this back tension control is also important in terms of dredging work.

Conventionally, this back tension control involves applying the brake of the winch power 1 or 2 on the braking side based on the speed difference obtained from a rotation detector attached to the winch drum 3 or 4 on the driving side and a rotation detector attached on the winch drum 4 or 3 on the braking side. A method was used in which the braking side was controlled by the driver, or the brake was left to the operator's control and the expected amount was applied regardless of the speed.

In such conventional back tension control, the life of the swing wire 7.8 is shortened by constantly applying back tension that does not cause transfer, and transfer occurs to reduce the amount of back tension, so that smooth dredging is possible. There was a drawback that sometimes the work could not be done.

This invention eliminates the above-mentioned drawbacks, and embodiments of the invention will be described with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram according to an embodiment of the present invention. As shown in the figure, the electrical voltage signal of the detected angle from the angle detector 15 of the gyro compass 12 is applied to the calculator 16. The comparator 17 compares the electric voltage signal of the actual swing speed obtained from the output of the swing speed with the electric voltage signal of the set speed from the swing speed setter 14 that has set the swing speed. Output electrical voltage signal to swing direction and opposite side wire feed setting device 1
8, and when selecting the setting value of this setting device 18, if the actual swing speed value is larger than the setting value of the swing speed setting device 14, set a value proportional to that amount, and make sure that the difference is zero. The design is such that even if the difference exceeds a certain value, the braking force is increased by setting an arbitrary value, such as the weight equivalent to the length of the wire.

This certain value is the anchor 9 on the left and right with respect to the dredging direction.
This is provided assuming that there is an imbalance in 10 positions, and of course the values of these provided devices are set to be adjustable.

The set value of the wire feed-out setting device 18 on the side opposite to the swing direction thus set automatically controls the winch on the feed-out side to apply a braking force and automatically prevent transfer.

Figure 3 is a diagram showing the relationship between the difference between the actual swing speed and the set speed and the swing back tension control.
On the negative side of the Y-axis direction, the wire tension force (braking force with respect to the swing direction) on the side opposite to the swing direction is expressed in %, and on the positive side of the X-axis direction, the difference between the set speed of the swing speed setting device 14 and the actual swing speed is shown. The value when the actual swing speed is large is expressed as a percentage, and the value when the actual swing speed is small is expressed as a percentage on the negative side of the X-axis due to the difference between the set speed of the swing speed setting device 14 and the actual swing speed.
As explained above, the curves A and A
' indicates the relationship between the swing back tension control force and the difference between the swing speed set value and the actual swing speed when the imbalance in the positions of anchors 9 and 10 is not taken into account, and dashed lines B and C indicate the relationship between the swing back tension control force and , 10 shows the relationship between the two when taking into account the positional imbalance,
The straight line indicates the adjustable width due to unbalance of the anchors 9 and 10.

As explained above, the present invention uses the actual swing speed obtained by calculating the angle change of the gyro compass in back tension control to prevent transfer by the cutter of a two-motor, two-drum swing winch of a cutter dredger. The actual speed of the brake cover turn setting for back tension control obtained by comparing the speed set on the swing speed setting device exceeds the value set assuming an imbalance between the left and right anchor positions with respect to the dredging direction. If the actual speed is 0, then the swing speed is set proportional to the amount, and the actual speed is set from zero to the value set assuming the unbalance of the left and right anchor positions, which is enough to eliminate the slack in the wire, and the actual speed is the swing speed. It is characterized by the fact that even when the speed is slower than the setting speed of the setting device, the feeding speed does not increase beyond the value set assuming the unbalance of the left and right anchor positions, so it exhibits excellent effects as described below. do.

(b) Wire life is extended by reducing swing wire fatigue.

(b) During normal operation, the back tension is set to the minimum value and the braking force is increased only when transfer is about to occur, so there is no waste of swing power during steady operation.

(c) Work efficiency is greatly improved as wire breakage due to transfers is prevented.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the outline of the dredger, Fig. 2 is a block diagram of the control device according to the present invention, and Fig. 3 is a setting value selection of the wire feed force setting device on the opposite side to the swing direction according to the embodiment of the present invention. FIG. 1... Port winch motor, 2...
Motor for starboard winch, 3... Winding barrel for port winch, 4... Starboard winch circumferential barrel, 5...
・Swing winch, 6...Cutter head, 7
, 8... Swing wire, 9.10...
・Anchor, 11... Cutter motor, 12...
... Gyro compass, 1 ... Driving spud, 14 ... Swing speed setting device, 15 ...
...Gyro compass angle change detector, 16...
... Arithmetic unit, 17... Comparison circuit, 18...
・・Wire feed force setting parent on the side opposite to the swing direction

Claims (1)

[Claims] 1. In the back tension control of the cutter of a two-motor, two-drum swing winch of a cutter dredger to prevent transfer, the actual swing speed obtained by calculating the angle change of the gyro compass and the speed set on the swing speed setting device are compared. The deviation signal is applied to the payout force setting device of the wire opposite to the swing direction, and the deviation signal is set from zero to a value set assuming an imbalance between the left and right anchor positions with respect to the dredging direction. is a setting value that provides a braking force sufficient to eliminate slack in the wire, and increases the braking force when the deviation signal exceeds a value set assuming an imbalance between the left and right anchor positions. A swing winch control method for a cutter type dredger, which is characterized by: