JPS6270177A - Cable bite detector of mooring winch - Google Patents

Abstract

PURPOSE:To obtain a cable bite detector for detecting the cable bite and immediately taking actions to release the random winding by comparing signals from the rotating speed meter of a mooring winch and the delivery speed meter of a mooring cable with reference values for judgement. CONSTITUTION:When a mooring cable 3 is drawn out while being bitten by a mooring winch 2, it is drawn out in response to the rotation of the mooring winch 2 up to the bitten place, but the delivery is stopped near the place facing a cable length meter 12. When the mooring winch 2 tends to rotate further, if the cable tension is larger than the torque of the mooring winch 2, the mooring winch 2 is stopped; if smaller, the cable 3 is wound. During delivery of the cable 3, a judging circuit 13 compares the rotating speed of the mooring winch 2 with the reference value for judgement, and when the mooring winch 2 is stopped, a cable bite signal is generated. In addition, even when the mooring winch 2 is rotating, the delivery speed of the cable 3 is compared with the reference value for judgement to generate a cable bite signal. Actions to release the random winding can be taken via these signals, and furthermore the cable bite can be detected with a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cable encroachment detection device for a mooring aircraft.

In recent years, there has been an increasing need for automation in ship navigation due to rising labor costs and a shortage of crew members. Considering the automation of mooring as one of these, it is necessary to control the mooring machine in the order of mooring → ship position control (while moored) → leaving the berth. In this case, if the mooring line digs in (a condition in which the rope that should be wound on the outside bites into the layer wound inside the mooring machine, making it impossible to let out the cable line), control becomes uncontrollable.

Therefore, a method has been proposed in which a pinch roller is used to control the tension of the cable so that the cable does not become wedged when the cable is wound in, and a rope shifter is used to wind the cable in an orderly manner. However, this method cannot be applied to automated mooring. In other words, when controlling the ship's position, the cable tension is extremely large, and the pinch rollers and rope shifters have insufficient capacity, and they must be released, so the cables are directly entangled by the driving force of the mooring machine, which prevents the cables from digging in. will occur.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a complete cable encroachment detection device for detecting encroachment of a cable and immediately taking measures to release the disturbance when automating mooring. The purpose is to

The mooring machine cable encroachment detection device of the present invention comprises a mooring machine tachometer, a mooring line payout speed meter, and a judgment circuit that compares and judges the signals from both of the speed meters with a reference value. .

An embodiment of the apparatus of the present invention will be explained below with reference to FIG. In the figure, reference numeral 2 denotes a mooring machine (winch) that takes in and lets out the mooring line 3 that is covered with a membrane on the hull 1. Ginch rollers 4 and rope shifters 5 are provided so that the mooring line 3 is wound around the mooring machine 2 without biting into the tether. The pinch roller 4 is moved in sync with the mooring machine 2 so that the rope rope 3 does not slacken between the mooring machine 2 and the mooring machine 2. Also rope shifter 5
The tangled 1
Can you do it? It is designed to reciprocate in synchronization with the mooring machine 2 so as to guide it. In addition, if the mooring line 3 is under great tension, such as when a tugboat is pulling the tip of the line or when the tip is fixed to a bit on the quay, C.
The pinch roller 4 and rope shifter 5 may be fully opened. 1
A tachometer attached to the shaft of the mooring machine 2 detects the rotation angle and rotation speed of the mooring machine. Reference numeral 12 denotes a cable length needle that detects the entire length and speed of the mooring line 3. For example, the wire length and speed are detected from the number of rotations and the rotation speed of a roller that rotates in contact with the rope. There is. Then, the rotational speed signal and unwinding speed signal from the tachometer 11 and the long rope needle 12 are sent to a judgment circuit 13, and compared with the total reference values of the rotational speed and unwinding speed, and the cable is detected to be digging in. .

The operation of the device of the present invention will be explained below. FIG. 2 shows a situation in which the rope 3 is let out with the rope 3 biting into the mooring machine 2.

(a) The mooring line 3 can be fully paid out according to the rotation of the mooring machine 2 up to the biting point (at this time, tension is applied to the line by the pinch roller 4 or quay bit, etc.).

(b) In the vicinity where the biting point is directly opposite the cable long needle 12, the cable 3
The feeding stops.

When the mooring machine 2 attempts to rotate after passing (c) and (b), (1) If the rope tension is greater than the torque of the mooring machine 2, the mooring machine 2 will stop.

(2) If the cable tension is smaller than the torque of mooring machine 2, cable 3
Conversely, the weight of the mooring machine 2 is lifted.

Figure 3 shows the entire graph of this state N. It is shown in Figure 4.

Here, the penetration (1) and (2) are (1) of (C) above.
, corresponds to (2). It is also assumed that the rotation angle θ, rotation speed θ, cable pay-out height X, and pay-out speed day of the mooring machine are positive when the cable is paid out.

Therefore, while the mooring line 3 is being let out, in the judgment 1 circuit 13,
As shown in Fig. 5, the rotational speed of the mooring machine 3; C total reference value (
) and θ≦0 (state of intrusion (1), bright) d
When the mooring machine stops, the full cable cutting signal is sent. And even if the mooring machine 2 is rotating and the strike θ〉O,
Compare and judge the rope payout speed with the semi-value α and find that the peak ≦ α
(State of encroachment (2)) That is, when the cable is reversely entangled in the mooring machine, a cable encroachment signal is issued. In this way, cable encroachment can be completely detected. In addition, the reference value α at this time
Although in principle it may be zero, it is preferable to set it to a negative value in order to eliminate instability due to elongation of mooring lines, etc.

The cable encroachment detection device for a mooring machine according to the present invention is as described above, and can reliably detect cable encroachment with a relatively simple configuration.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the device of the present invention, and Fig. 2 (
a) (b) (c) are explanatory diagrams showing the situation of the cable being fed out over time when the cable is biting in; Figures 3 (a), (b) and 4
Figures (a) and (b) show the case where the cable does not dig in, and
Explanatory diagram showing changes in the rotation angle, rotation speed, cable payout length, and payout speed of the mooring machine when the mooring machine is wedged, No. 5
The figure is a functional explanatory diagram of the comparison/judgment circuit. 2... Mooring machine, 3... Mooring line, 11... Mooring rotation speed □ meter, 12... Cable payout speed meter, 13...
Comparative judgment circuit.

Claims (1)

[Claims] A mooring machine cable encroachment detection device comprising a mooring machine rotation speed meter, a mooring line payout speed meter, and a judgment circuit that compares and judges signals from both of the speed meters with a reference value.