JPH0632591A - Overwinding warning device for crane - Google Patents

Abstract

PURPOSE:To prevent generation of slackness of the cable for overwinding of an overwinding warning device and prevent injury of the cable. CONSTITUTION:In the overwinding warning device of a crane in which a weight 13 for overwinding is suspended by means of a cable 12 for overwinding from the working link 11A of an overwinding detector fitted to the extreme end part of a boom 1, a winding device 2 which always energizes the cable 12 for overwinding on the winding side, is provided on the working link 11A of the overwinding detector 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane overwinding alarm device which warns a crane hook so as not to be overwound.

[0002]

2. Description of the Related Art In a wind-up alarm device for a crane, as shown in FIG. 12, a wind-up weight 13 that surrounds one of a plurality of hook-winding wire ropes 16 that suspend a hook 14 is provided. , Winding over detector 11 attached to the tip of boom 1
The operation link 11A is suspended by a rope such as a wire rope 12 for winding. As shown in FIG. 13, when the hook 14 is hoisted up near the tip of the boom 1 by the wire rope 16 for hoisting the hook, the hoisting weight 13 moves to the hook 1
4 Wire rope for winding 12 which is lifted by abutting on the upper end
Is loosened, the actuation link 11A pulled down by the winding-over weight 13 returns to its original position and the winding-over detector 1
1 detects the winding state of the hook 14. Therefore, the winding over warning device 10 emits an alarm sound to warn the operator not to wind the hook 14 any more. There is also a structure in which the winding operation is automatically stopped by detecting the hook winding state of the winding detector 11.

[0003]

In recent years, in order to simplify and automate the retracting operation when retracting the hook before traveling the crane, an automatic retracting device for the hook, which is adapted to retract the hook at the tip of the boom, has been used. It is designed to be used. As shown in FIG. 14, this hook automatic storage device has a hook guide 15 having an arcuate guide surface 15F formed at the tip of the boom 1, and the hook guide 15 is attached to the upper end of the hook 14.
The roller 17 that rolls in contact with the guide surface 15F of
When the hook 14 is stored, the hook 14 is further wound even after the overwinding alarm device 10 is activated, and the wound hook 14 is lifted to bring the roller 17 into contact with the guide surface 15F of the hook guide 15. Rolls along the guide surface 15F and continues the hoisting operation until it is stored in the storage position at the tip of the boom 1 as shown in FIG.

However, if the winding is further continued after the winding alarm device 10 is activated in this way, the winding wire rope 12 which has become loose in the winding state is slackened by the tip of the boom 1 and the hook 14. It can be bitten by and damaged. The present invention is to solve such a problem in a rollover warning device for a crane, and prevents the rollover body from being loosened, thereby preventing damage to the rollover body. An object is to provide an over-warning device.

[0005]

SUMMARY OF THE INVENTION The present invention is a rollover warning device for a crane in which a rollover weight is suspended by a rollover rope from an operation link of a rollover detector attached to the tip of a boom. In order to solve the above-mentioned problems, a winding device that constantly urges the winding-up rope body toward the winding side is provided in the operation link of the winding-over detector.

[0006]

[Function] When the hook is wound up to the vicinity of the tip of the boom by the wire rope for hoisting, the hoisting weight comes into contact with the upper end of the hook and is lifted, and the hoisting rope loosens and is lowered by the weight of the hoisting weight. The actuated link that has been released returns to its original position, and the winding over detector detects the winding state of the hook. When the hook is stored, the hook is further wound even after the overwinding alarm device is activated, and the hoisting operation is continued until the wound hook moves up and is stored in the storage position at the tip of the boom 1.

At this time, a slack is generated in the hoisting body for continuing the hoisting operation, and the slack is wound by the winding device. Therefore, the winding cord is not damaged by being bitten between the boom tip and the hook.

[0008]

1 to 4 are side views of a boom tip portion provided with a winding over alarm device according to an embodiment of the present invention. The winding-over warning device 10 of the crane includes a winding-up weight 13 that surrounds one of a plurality of hook-winding wire ropes 16 that suspends a hook 14, and a winding-up wire rope 12.
Then, the boom 1 is suspended from the operation link 11A of the overwinding detector 11 attached to the tip of the boom 1. Winding wire rope 1
2 is attached to the operation link 11A via the winding device 2. The take-up weight 13 is attached to the take-up wire rope 12 via a ring 18 so that the take-up weight 13 can swing back and forth.

In the winding device 2, as shown in FIGS. 5 and 6, a drum 22 for winding the winding wire rope 12 is rotatably attached to a working link 11A by a shaft 23,
It is housed in the case 21. The drum 22 has a spiral spring 24 built therein and is constantly urged in a direction of winding the winding wire rope 12. A hook guide 15 having an arc-shaped guide surface 15F is attached to the tip of the boom 1, and a roller 17 that rolls in contact with the guide surface 15F of the hook guide 15 is provided at the upper end of the hook 14. , Constitutes an automatic storage device for hooks.

During the crane work, the wire rope 12 for winding over
1 is suspended against the winding force of the mainspring 24 by the weight of the winding weight 13 as shown in FIG. 1, and the operation link 11A of the winding detector 11 is lowered as shown in FIG. The limit switch 11S of the winding excess detector 11 is OFF because it has been rotated to. As shown in FIG. 2, when the hook 14 is wound up by the wire rope 16 for winding up the hook to be in the winding state, or when the hook 14 reaches the winding position when the hook 14 is stored, the upper end portion of the hook 14 has a winding weight. 1
The winding weight 13 is lifted by coming into contact with 3. Then,
Since the hoisting wire rope 12 that has been lifted loosens, the operating link 11 that has been pulled down by the hoisting weight 13
A returns to the original position as shown in FIG.
The limit switch 11S of No. 1 is turned on, and the winding state is detected.

When the hook 14 is stored, the hook 14 is further wound up, and as shown in FIG. 3, the wound hook 14 rises and the roller 17 contacts the guide surface 15F of the hook guide 15. Then, the roller 17 has the guide surface 15
The hoisting operation is continued until it rolls along F and is stored in the storage position at the tip of the boom 1 as shown in FIG. At this time, by continuing the hoisting operation, the winding wire rope 12
The extra slack that occurs in 1 is immediately wound up by the winding device 2. Therefore, the take-up wire rope 12 will not be bitten between the boom tip and the hook and damaged. Figure 4
Limit switch 1 of the winding excess detector 11
1S is ON as shown in FIG.

In this embodiment, the winding wire rope 12 is used as the winding wire, however, a wire rope other than the wire rope may be used. FIG. 10 shows an embodiment in which a strip plate 12B made of spring steel is used as a winding body for winding.
In this embodiment, the winding wire rope 12 is a drum 22.
The winding device 2 has no risk of being unwound from the coil or winding irregularly.
Becomes compact.

As shown in FIG. 11, the winding weight 13 is provided.
However, the case 21 of the winding device 2 can be attached to the actuation link 11A of the overwind detector 11 via the ring 19 so that the case 21 can be swung not only forward and backward but also left and right.

[0014]

As described above, the winding warning device for a crane according to the present invention can prevent the winding rope from being loosened and prevent the winding rope from being damaged.

[Brief description of drawings]

FIG. 1 is a side view of a boom tip portion provided with a rollover warning device according to an embodiment of the present invention.

FIG. 2 is a side view of the boom tip portion with the hook in the winding position.

FIG. 3 is a side view of a boom tip portion at a position where a roller of a hook is in contact with a guide surface of a hook guide.

FIG. 4 is a side view of the boom tip portion with the hook in the retracted position.

FIG. 5 is a vertical cross-sectional view of the winding device.

FIG. 6 is a vertical longitudinal sectional view of the winding device.

FIG. 7 is an explanatory diagram of the operation of the limit switch of the winding over detector.

FIG. 8 is an explanatory diagram of the operation of the limit switch of the winding over detector.

FIG. 9 is an explanatory diagram of the operation of the limit switch of the winding over detector.

FIG. 10 is a vertical cross-sectional view of a winding device according to another embodiment.

FIG. 11 is an explanatory view of attachment of a winding device according to another embodiment.

FIG. 12 is a side view of a boom tip portion provided with a conventional rollover alarm device.

FIG. 13 is a side view of a boom tip portion provided with a conventional rollover alarm device.

FIG. 14 is a side view of a boom tip portion provided with a conventional rollover alarm device.

FIG. 15 is a side view of a boom tip portion provided with a conventional rollover alarm device.

[Explanation of symbols]

 1 Boom 2 Winding device 10 Winding over alarm device 11 Winding over detector 11A Operation link 11S Limit switch 12 Winding over wire rope 13 Winding over weight 14 Hook 15 Hook guide 15F Guide surface 16 Hook hoisting wire rope 17 Roller 18 ring 21 case 22 drum 23 shaft 24 mainspring

Claims (1)

[Claims] 1. A rollover warning device for a crane, wherein a rollover weight is suspended from an operation link of a rollover detector attached to a tip end portion of a boom, and the rollover alarm is provided. A winding-over warning device for a crane, wherein a winding device for constantly urging the winding-up rope body toward the winding side is provided on an operation link of the container.