JP3339476B2 - Winding loose avoidance device in winch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for avoiding winding loosening in a winch, and more particularly to a cable using a signal cable, a power transmission cable, a steel cable capable of withstanding up and down work, and the like (hereinafter simply referred to as a cable). The present invention relates to a device for avoiding loosening of a winch used when a payout or a winding operation is performed using a winch.

[0002]

2. Description of the Related Art In a winch system for unwinding or winding a cable, if an abnormality in the winding state occurs during the unwinding or winding of the cable and the operation continues without change, the winding of the cable is stopped. Tangles, climbing, biting, etc., occurred due to the turbulence, and a great deal of labor and time were required for recovery. If recovery was not possible, cables were cut off.

As a technique for preventing such a winding abnormality,
For example, there is a technique disclosed in Japanese Patent Application Laid-Open No. 62-257688. Although the gazette describes a tape cartridge for winding a tape, if the object is described as a cable, by providing a suppressing mechanism that applies a constant pressure to the winding point of the cable winding section, turbulence and loosening after the winding point are provided. Even if it occurs, a method has been proposed in which the influence does not progress on the cable winding portion. In the method disclosed in the prior art, as shown in FIG. 5, the cam 12 operates only when the cable is wound, and the holding plate 13 holds the holding plate 15 via the spring 14 to hold the surface of the cable winding portion. By providing a mechanism for attaching the cable, loosening does not occur in the cable winding section.

[0004]

However, in the above-mentioned technique, since the operation of the restraining mechanism is performed only when the cable is wound, there is a drawback that the winding mechanism is not vulnerable to loosening when the cable is pulled out. There is.

Further, in the above-mentioned technique, even if the holding mechanism is operated even when the cable is unwound, the holding mechanism functions as a brake against the unwinding of the cable at the unwinding point at the winding section of the cable.
There is a relative speed difference between the cable feeding speed and the rotation speed of the winding unit, and as a result, the winding unit is loosened.

In general, when there is a possibility that loosening may occur at the time of cable unwinding, a method of slowing or stopping the unwinding may be considered. In situations where the work cannot be recognized, for example, when the work is lowered into the sea, it may collide with the seabed or unexpectedly move out to allow loosening, or the rotational inertia of the cable winding part is large, and In some cases, there is a winch system or the like that cannot be stopped, and there is a case where a method of reducing the feeding speed or stopping does not make sense. In particular, when the work is lowered at a high speed, this case becomes remarkable.

Further, when the above-described loosening occurs, in order to return to a normal winding state, the cable must be lifted and bitten by the loosening of the cable, so that the cable can be manually operated by the operator. It was necessary to pay out or rewind, and a great deal of labor and time was spent for recovery. In addition, the cable had to be cut if it could not be recovered.

Heretofore, there has been no proposal which actively considers the measures against the loosening of the winding when the cable is extended.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a winch loosening prevention device which prevents an abnormal winding state when the winding loosens during cable feeding.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a winch or the like for unwinding or winding a cable, which is used when a condition that a loosening occurs during the unwinding of a cable at a side surface portion of a cable winding portion. For example, at the time of entry from the air into the water or at the time of landing on the ground or the bottom of the water,
A pair of movable arms for winding up the winding loosening that would normally occur is provided, and when loosening occurs, the movable arm is extended in the winding axis direction to form a temporary winding drum, It is characterized in that a part corresponding to the loosening is wound around the winding drum.

[0011]

FIG. 1 is a block diagram showing an embodiment of a winch system according to the present invention. First, a cable winding section 5, a rotation direction of the cable winding section 5, and a start / stop of rotation. And a controller 6 for performing control and drive control of each arm drive unit 8. The cable winding section 5 has a capacity capable of storing a predetermined cable length and a driving capability for rotating itself. The front pulley portion 2 plays a role of a pulley for smoothly feeding or winding the cable 4. The tension detecting unit 3 holding the front pulley unit 2 has a sensor function of measuring a cable tension, and outputs a measurement result to the controller 6. Cable 4
Has the strength required to raise and lower the work 1.
The work 1 represents a transported object or a work.

In the present invention, as a characteristic configuration,
It has a plurality of pairs of movable arms 7 housed in the side surface of the cable winding section 5 and the same number of arm driving sections 8 for driving the arms. Each of the movable arms 7 is symmetrically attached to both side surfaces of the cable winding portion 5 so as to form a pair, and the surface thereof grips the cable 4 (closely contacts the cable surface using static frictional force). The pair of movable arms 7 are operated by the arm driving unit 8 to extend the arms from both sides of the cable winding unit 5, and as a result, a temporary winding drum is provided near the outer periphery of the cable winding unit 5. To form Each arm driving unit 8 drives each movable arm 7 according to a control signal from the controller 6. The movable arm 7 is housed in the side surface of the cable winding unit 5 at the time of ordinary cable feeding or winding, but when the condition for generating loosening is satisfied based on the cable tension detecting unit 3, the movable arm 7 is stored in the side surface. It is made to protrude in the winding axis direction from the part.

In the figure, a cable winding unit 5 is controlled by a control unit 6.
, And the cable 4 is fed out or wound up, so that the work 1 can be raised and lowered via the front pulley 2 and the like. At this time, the cable tension during operation is recognized by the cable tension detecting unit 3 holding the front pulley unit 2. As described above, since a plurality of pairs of movable arms 7 are housed in the side surface of the cable winding section 5 during normal cable feeding or winding, there is no effect on cable feeding or winding. When the cable tension detecting unit 3 detects that the winding loosening has occurred, that is, the cable tension has become close to zero, the arm driving units 8 are set in parallel with the rotation axis of the cable winding unit 5. Each movable arm 7 is operated. Thereby, a plurality of pairs of the movable arms 7 pull in the cable that would normally be loosened before the cable winding unit 5 stops in the rotation direction of the cable winding unit 5, and several pairs of the movable arms 7 Using the rotational force of the cable winding unit 5 on the temporary winding drum formed by the operation, the winding is performed in the direction opposite to the rotation direction.

As a result, loosening of the cable originally causes the cable 4 to be entangled, run over, or bitten in the cable winding section 5, and a great deal of labor and time has been required to recover the cable. In the present invention,
Since a portion corresponding to the winding looseness is wound around a virtual winding drum formed by the movable arm 7, it can be prevented. The effect is obtained that only the cable winding section 5 needs to be reversed in that portion.

FIG. 2 shows a configuration example of the movable arm 7 in the embodiment of the present invention. In FIG. 2, the movable arm 7 includes a rigid member 9 and an elastic member 10. The rigid member 9 receives a reaction force from the cable when the movable arm 7 grips the cable 4. The elastic material 10 reduces the impact at the moment when the movable arm 7 grips the cable 4 and maintains the gripping property of the cable 4 thereafter. As the material of the elastic member 10, a material similar to rubber is preferable.
This is because the rubber elasticity can absorb the impact, and the contact friction force on the surface is larger than that of a metal or the like, which is suitable for gripping the cable 4.

The arm driving section shown in FIG. 1 is constituted by an electric motor or the like, and since the configuration is well known to those skilled in the art, a detailed description thereof will be omitted.

The operation of this embodiment will be described below with reference to the state transition diagram of FIG. State 1 shows a normal cable unwinding state, in which the movable arm is housed on the side of the cable winding section.

State 2 is an extension at the moment when the condition of the occurrence of the loosening of the winding is satisfied, that is, when the cable tension reaches near zero when the work enters the water from the air or touches the ground or the bottom of the water. The state is shown. In this state, the controller receives the cable tension signal from the cable tension detection unit, recognizes the winding loosening condition, outputs a drive signal of the movable arm to the arm driving unit, activates the movable arm, and controls the cable. The deceleration control for stopping the rotation of the winding unit is performed. After the movable arm operates,
An arch is formed together with the movable arm attached to the opposite side so that a gap is not generated at least over the diameter of the cable with respect to the width of the winding section of the cable winding section.
The other three pairs of movable arms perform the same operation. By the operation of these four pairs of movable arms, a winding drum is temporarily formed near the outermost periphery of the cable winding portion.

State 3 shows a state in which the cable is pulled out when the cable is gripped by the arch formed by the movable arm. At this point, since the speed of the cable gripping portion and the cable winding portion in the rotational direction are exactly the same. In addition, the cable tension, which is a condition for the occurrence of loosening, does not become close to zero, and no loosening occurs in the cable winding portion.

State 4 shows a state in which the cable is unreeled while the rotation of the cable winding section is stopped. After the cable is gripped by the arch in state 3, the winding drum temporarily formed until rotation stops. It is wound up.

As a result, the portion of the cable which is likely to be loosened is wound around the winding drum different from the cable winding portion, so that the cable does not become entangled or jammed, and a normal winding state is achieved. Can be accomplished simply by reversing the cable winding section for unwinding the cable wound on the winding drum and returning the movable arm to the original position.

As another embodiment of the present invention, the basic structure is as described above. FIG. 4 shows a structure in which the link structure of each movable arm 7 is changed. In FIG. 4, the structure of the link portion of each movable arm 7 is a cam 11. Thereby, after each movable arm 7 operates, the cam 1
Since 1 is mechanically fixed to the side surface of the cable winding section, it is possible to handle the reversal torque due to the cable reaction force at the link portion. Therefore, the object of the present invention can be achieved even when the holding torque of the movable arm 7 is insufficient, for example, when an electric motor is used for the arm driving unit.

As a second alternative embodiment, if the moving speed of the suspended unloading material and the rotation speed of the cable take-up part can be separately detected, instead of detecting the condition of the loosening caused by the cable tension, A method is also possible in which detection is performed based on a difference between the moving speed of the suspended unloading material and the rotation speed of the cable winding section.

As a third alternative embodiment, the number of movable arms can be reduced in order to reduce interference between the cable wound around the cable winding section and the cable wound around the winding drum by the movable arm. As many as possible are preferable, but 1
It may be constituted by a pair of movable arms, and the number is not limited.

[0025]

A first effect of the present invention is that the labor and time required for restoring tangling, biting, and the like of a cable caused by loosening can be reduced and shortened.

The second effect is that the cable is not cut because the winding loosening cannot be recovered.

It should be noted that the present invention is not limited to the above embodiments, and each embodiment can be appropriately modified within the scope of the technical idea of the present invention.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a movable arm according to the embodiment of FIG. 1;

FIG. 3 is a state transition diagram showing the operation of the present invention.

FIG. 4 is a view showing another movable arm applicable to the embodiment of FIG. 1;

FIG. 5 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 7: movable arm 8: arm driving section 9: rigid member 10: elastic member 11: cam

Claims (3)

(57) [Claims] The present invention further comprises a plurality of pairs of movable arms mounted inside a reel side surface of a cable winding section, and when the winding is loosened, the movable arms are extended in the winding axis direction to temporarily wind the winding drum. And a winding slack avoiding device for a winch, wherein a winding slack is wound around the winding drum. 2. A reel for winding and unwinding a cable, a plurality of pairs of movable arms mounted in the side surface of the reel, and a winding for detecting loosening of the cable when the cable is unreeled, based on a force applied to the cable from the reel. A slack detecting means, and based on the winding slack detection information, when the winding slack occurs, the movable arm is extended in the winding axis direction to form a temporary winding drum, which corresponds to the winding slack. A device for avoiding loosening in a winch, characterized by winding up a minute. 3. The winch loosening prevention device for a winch according to claim 1, wherein a portion of the surface of the movable arm that contacts the cable is made of a material that holds the cable.