JP2001048482A - Wire slack detecting device for winch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a limit switch from being operated at random by stopping the drum unwinding operation or increasing the rotating speed of a roller. SOLUTION: A frame 3 is horizontally supported on a bed 6 of a winch to be freely rotatably round a horizontal shaft 4 passing the vicinity of center of gravity. One rotating end of the frame 3 is disposed on the lower surface of a wire 11 wound round a drum 12 of a winch. An end of the frame 3 is pushed upward by a plate spring 7 having one end fixed to the bed through a support 5 and the other end coming into contact with the frame 3. A stopper 9 is provided between the frame 3 and the bed 6, and a gap is provided between the A end and the wire 11. A face 3a coming into contact with a roller 10a of a limit switch 10 is formed on the end face of the other rotating end opposite to the A end of the frame 3. The contact surface 3a is formed so that when the frame 3 is rotated to raise the B end, the distance between the contact surface 3a and the horizontal shaft 4, that is, the rotating shaft 4 of the frame 3 is gradually increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire slack detecting device for a winch, which detects the slack of a wire when the drum of the winch is rotated to unwind the wire. It is about.

[0002]

2. Description of the Related Art An example of a conventional winch will be described with reference to the drawings. FIG. 2 is an explanatory view showing a main part of a conventional winch, in which a drum 12 around which a wire 11 is wound is fixed to a winch base 6 so as to be rotatable. The wire 11 unwound from the drum 12 is sandwiched by two rollers 13 rotatably mounted on the base 6 with an appropriate force.
Also, an appropriate rotational force is applied to the wire 11 so that the wire 11 obtains tension in the unwinding direction and is prevented from loosening.

[0003]

However, the conventional apparatus has the following problems. If the speed at which the roller 13 rotates in the unwinding direction of the wire 11 is lower than the speed at which the wire 11 is unwound from the drum 12, the wire 1
1 is loosened between the drum 12 and the roller 13, and the wire 11 is loosened one after another at a portion wound around the drum 12, which may hinder the rotation of the drum 12.

Although not shown, a mechanical detection unit using a microswitch for detecting the looseness of the wire is provided. However, the sensitivity is poor, and furthermore, the electrical detection for contamination or pollution by seawater or oil is performed. When the winch is used at sea or when the winch is used in the sea, a wire containing seawater may be entangled in the drum. It was impossible. The present invention has been made in view of the above points, and an object of the present invention is to provide a winch wire looseness detecting device which solves these problems.

[0005]

Means for achieving the object are as described in claim 1, wherein when the wire is unwound from the drum, the slack of the wire is mechanically detected to eliminate the slack. A wire loosening detection device for a winch, a wire unwound from a drum, a roller for unwinding the wire, and a seesaw mounted on a base provided between the roller and the unwinding opening of the drum and supporting the drum. A frame provided so as to support the central portion as it pivots, and a wire hanging down and abutting; a spring fixed to the base plate for restricting swinging of the frame; a detecting device for detecting a degree of looseness of the wire; It consists of a slack control device that controls the slack of the wire by inputting the wire slack signal from the device, and if the wire is not loose, the wire has a distance from the frame at one top of the frame. When the wire is loosened, this gap disappears and the wire abuts against the frame at the bottom of the wire.If the wire is further loosened, the frame is pushed down against the bias of the spring, and the state of this pushing down is detected by the detection device. A slack signal transmitted from the detecting device to a control device to stop the unwinding operation of the drum or to increase the rotation speed of the roller. It is.

According to a second aspect of the present invention, the detection device is a limit switch provided with a roll at the tip, and the roll travels on an inclined portion formed on the frame according to the looseness of the wire, and reaches a set maximum looseness limit. 2. The winch wire looseness detecting device according to claim 1, wherein a signal is transmitted to the control device at the time when the control is performed.

That is, a mechanical detection unit (detection device) for mechanically detecting the looseness of the wire, and an electric detection unit (control device) for electrically transmitting a signal in accordance with the operation of the mechanical detection unit. This is a winch wire looseness detection device characterized in that the wire is loosened, and is configured as follows. A, the frame is supported horizontally on a winch platform so as to be rotatable about a horizontal axis (corresponding to a seesaw fulcrum) passing near the center of gravity.
A, one rotating end of the frame (hereinafter referred to as A end) is disposed on the lower surface of the wire wound around the winch drum. C) One end is fixed to the base, and the A end of the frame is pushed up by a leaf spring having the other end in contact with the frame, and a stopper is provided between the frame and the base, whereby the A end and the wire There is a gap between them.
The other end of rotation with respect to the A end of the frame (hereinafter referred to as B end)
Is formed on the end face of the limit switch in contact with the roller of the limit switch. The contact surface is formed so that the distance between the contact surface and the horizontal axis, that is, the rotation axis of the frame, gradually increases when the frame rotates in the direction in which the end B rises. F. Mount the limit switch on the winch board with the rotation axis of the roller of the limit switch parallel to the rotation axis of the frame.

In this embodiment, a leaf spring is used. However, the present invention is not limited to this, and the limit switch is installed at the end of the frame. However, the present invention is not limited to this. Any place may be used as long as it can detect that the spring is pressed down against the spring. Further, although the looseness of the wire is detected by the limit switch, the invention is not limited to this, and the detection of the looseness by a sensor such as light or ultrasonic wave is also included. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural view showing a main part of an embodiment of the present invention. In FIG. 1, a wire 11 is wound below a wire 11 wound around a drum 12 by means shown in FIGS. This constitutes a looseness detection device. A, horizontal axis passing frame 3 near its center of gravity (pins are attached to the frame)
4 and supported horizontally on a winch platform 6 so as to be freely rotatable. One end of the frame 3 (hereinafter referred to as A end)
It is arranged on the lower surface of the wire 11 wound around the winch drum 12. C. One end is fixed to the base 6 via the support 5, and the A end of the frame 3 is pushed upward by the leaf spring 7 having the other end in contact with the frame 3, between the frame 3 and the base 6. A stopper (set with a push bolt) 9 is provided, and a gap is provided between the A end and the wire 11. The roller 10 of the limit switch 10 is provided on the end face of the other rotating end (hereinafter referred to as B end) with respect to the A end of the frame 3.
The surface 3a which contacts with a is formed. The contact surface 3a is formed such that the distance between the contact surface 3a and the horizontal axis 4, that is, the rotation axis 4 of the frame 3, becomes gradually longer when the frame 3 rotates in the direction in which the end B rises. F, roller 10 of limit switch 10
The limit switch 10 is mounted on the winch base 6 with the rotation axis of a being parallel to the rotation axis 4 of the frame 3.

Next, the main part of the present invention will be described. The frame 3 is constituted by the rod 1 and the arm 2. The frame 3 is rotatably fixed to a base 6 via an L-shaped support 5 by a rotating shaft (pin) 4. The leaf spring 7 is fixed to the support 5 by bolts 8. One end B of the frame 3 is lifted by a push bolt 9. The tip of the push bolt 9 serves as a stopper. Roller 1 of limit switch 10 attached to support 5
The surface 3a where 0a contacts the frame 3 is formed on the arm 2 as shown. The wire 11 is wound around a drum 12, and is sandwiched between rollers 13 at a portion unwound from the drum 12.

Next, the operation will be described. When the wire 11 wound around the drum 12 is loosened, the A end of the frame 3
The weight of the wire 11 moves downward against the force of the leaf spring 7. At this time, the B end of the frame 3 moves upward about the rotation axis 4 of the frame 3. And a limit switch 10 formed on the arm 2 at the B end.
The contact surface 3a contacted by the roller 10a gradually becomes the roller 10a
, The limit switch 10 is operated, and the looseness of the wire 11 is detected. Here, as a function of the leaf spring 7, when the detection device is subjected to vibration, the roller 10a of the limit switch 10 and the contact surface 3a at the B end are prevented from contacting each other, thereby preventing the limit switch 10 from malfunctioning.

[0012]

According to the winch provided with the wire looseness detecting device according to the present invention, when the winch is operated and the wire wound on the drum is unwound, the limit switch is operated immediately when the wire becomes loose. To stop the winch. Also, since the frame is rotatably supported on the base plate at the approximate center of gravity, even if this winch is mounted on a vehicle or the like and receives vertical vibration, the frame does not rotate due to inertial force and the limit switch is indiscriminately It does not work.
Also, since there is not much torque generated by the weight of the frame,
The force of the leaf spring can be designed to be weak, and the looseness of the wire can be detected sensitively. As described above, if the mechanical structure is provided at the lower part of the drum, and the electric detection unit such as the limit switch is appropriately enlarged in the size of the frame, the lower part of the drum can be provided so as to be reliable. The device can be highly efficient, and is extremely useful in practice.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of an example showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rod 2 Arm 3 Frame 3a Contact surface 4 Rotary shaft (pin) 5 Support 6 Board 7 Leaf spring 8 Bolt 9 Stopper (Push bolt) 10 Limit switch 10a Roller 11 Wire 12 Drum 13 Roller

Claims (2)

[Claims] An unwinding wire detecting device for a winch, wherein when a wire is unwound from a drum, a slack of the wire is mechanically detected to eliminate the slack. A roller for unwinding, a frame provided between the roller and the unwinding opening of the drum and provided on a base supporting the drum so as to support a central portion like a seesaw, and a frame on which a wire hangs down and abuts; A spring fixed to the base that regulates the swing of the frame, and a detecting device that detects the degree of looseness of the wire,
It consists of a slackness control device that controls the slackness of the wire by inputting a wire slackness signal from this detecting device. If the wire is not loosened, the wire is held at one upper part of the frame away from the frame. When loosened, the gap disappears and the wire comes into contact with the frame at the bottom of the wire.If the wire is further loosened, the frame is pushed down against the bias of the spring, and the pressed state is detected by the detecting device. A looseness detecting device for a winch, wherein the loosening signal from the detecting device is transmitted to a control device to stop the operation of unwinding the drum or to increase the rotation speed of the roller. 2. The detecting device is a limit switch having a roller at a tip. When the roller runs on an inclined portion formed on a frame according to a looseness of a wire, when the roller reaches a set maximum loosening limit. 2. The winch wire looseness detecting device according to claim 1, wherein the signal is transmitted to a control device.