JPS6111197Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overwind warning device provided for preventing overwinding in a crane.

The overwind warning device currently in use has a structure as shown in FIGS. 1 and 2.

That is, a weight 4 is hung diagonally from the tip of the jib 1 via a rope 5 at a position a required distance below the tip of the jib 1 of the cargo handling rope 3 which is suspended from the tip of the jib 1 and suspends the hook 2. The rope 3 is made to pass through the through hole 6 formed in the center in a loose state, and the dead weight of the sling 7, weight 4, etc. that connects the rope 5 is placed at the connection part between the rope 5 and the jib 1. Spring 8 compressed by Spring 8
An overwinding detector 10 is provided, which consists of a micro switch 9, which is installed with a suitable gap between the hanging device 7 and the rope 3 in the compressed state. , the weight 4 is lifted, the spring 8 pulls up the hanging tool 7, the upper end of the lifting tool 7 comes into contact with the micro switch 9, and the micro switch 9 is activated.
The alarm connected to the micro switch 9 is activated.

Although the overwinding alarm device described above has a simple structure and is easy to use, it has the disadvantage of causing malfunctions due to the following reasons.

One of them is that the member for suspending the weight 4 is a bendable rope 5, so as shown in FIG.
As the rope 3 is entangled with the rope 3, the weight 4 is lifted and the alarm is activated, and such malfunctions occur frequently in the case of single-stripe ropes where the rope 3 is likely to vibrate.

Two of them are that the through hole 6 through which the rope 3 passes is provided approximately in the center of the weight 4, and the suspension point 11 is located near the periphery of the weight 4, so that it is parallel to the central axis of the through hole 6 and the center of gravity of the weight 4 is The passing line does not pass through the hanging point 11. Therefore, the weight 4 is tilted from the state shown in FIG. 2, and the edge of the through hole 6 comes into contact with the rope 3. Therefore, if the rope 3 breaks, the weight 4 gets caught on the rope 3, causing the alarm to malfunction as described above.

The present invention has been developed to solve this problem, and involves suspending the weight that penetrates the cargo handling rope through a connecting member, making the tip of the rope impenetrable, and sensing changes in the load acting on the connecting member. In the over-winding alarm device which issues an alarm due to the above-mentioned rope, at least a range of the connecting member that can intersect with the rope is made of a rigid material.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 4, the same components as those shown in FIG. 2 are designated by the same reference numerals.

A through hole 12 is formed in the weight 13 so as to be offset from the center of the figure, and the shape of the through hole 13 is formed into a hyperboloid shape that gradually expands from the center of the hole toward both ends of the hole.
In addition, the hanging point 11 passes through the center of gravity of the weight 13 and the through hole 1
It is provided on a line parallel to the center axis of the hole No. 2.

Further, the lower half of the connecting member 14 connecting the hanging point 11 and the hanging tool 7 is a connecting rod 15 made of a rigid material such as a metal pipe, and the upper half is a flexible connecting cable 16 for each connection. The points are flexible.

As described above, even if the weight 13 rotates around the rope 3 and the rope 3 and the connecting member 14 intersect, the connecting rod 15 is rigid at the part that intersects with the rope 3, so there will be no entanglement. Since the hanging point 11 of the through hole 12 is parallel to the center axis of the through hole 12 and is on a line passing through the center of gravity, the central axis of the through hole 12 and the central axis of the rope 3 are always parallel, and the weight 13 is Since the convex portion formed by the curved surface comes into contact with the rope 3, even if the rope 3 has a strand breakage, etc., it will not get caught.

Since the present invention is configured as described above, it is possible to prevent malfunctions caused by the connecting material becoming entangled with the rope, and furthermore, when the weight is configured as described above, malfunctions caused by catching between the weight and the rope can be prevented. can do.

In the above embodiment, the connecting member is composed of a connecting rod and a connecting cable, but the connecting rod may be connected in a bendable manner.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a crane equipped with an overload warning device, Fig. 2 is an explanatory drawing of a conventional example, Fig. 3 is an explanatory drawing showing the state of engagement with a rope in the conventional example, and Fig. 4 is an explanatory drawing showing the state of engagement with a rope in the conventional example.
The figure is an explanatory diagram of an embodiment of the present invention, and FIG. 5 is an explanatory diagram showing a state of engagement with a rope in the present invention. 3 is a rope, 12 is a through hole, 13 is a weight, 1
4 represents a connecting member, and 15 represents a connecting rod.

Claims (1)

[Scope of utility model registration request] In the overwinding alarm device, a weight for penetrating the cargo handling rope is suspended via a connecting member, the tip of the rope is made impenetrable, and an alarm is issued by sensing a change in the load acting on the connecting member. An overwind warning device characterized in that at least a range of the material that can intersect with the rope is made of a rigid material.