JP2000351583A - Excessive winding detecting weight for crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the wear of a wire rope to improve the durability by forming a vertical insert groove for inserting a hoisting wire rope on a weight body, and horizontally supporting a roller for preventing the separation of the wire rope from the insert groove on the open side of the insert groove. SOLUTION: An excessive winding detecting weight 10 has a mounting hole 12 for mounting an excessive winding wire rope and an insert groove 13 for inserting a hoisting wire rope provided on a weight body 11. The insert groove 13 is a horizontally U-shaped sectional groove vertically formed on the front surface of the weight body 11, and a roller 14 is horizontally supported on the open side by a shaft 15 in order to prevent the wire rope inserted to the insert groove 13 from being separated from the insert groove 13. According to this, the wear of the wire rope can be prevented to improve the durability, and the wrong operation of an excessive winding alarm device can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding detection weight of a crane used in a winding detection device.

[0002]

2. Description of the Related Art In a crane, a hook is hung from a tip end of a boom with a wire rope, and a loaded hook is hoisted.
When the hook is raised, it is necessary to prevent the hook, boom, wire rope, etc. from being damaged when the hook is raised. A winding detection device is provided for detecting a so-called winding state in which the distance between the hook and the tip of the boom is less than or equal to a predetermined distance. The winding detection device issues an alarm when detecting a winding state, and stops the operation to the hook rising side.

As shown in FIG. 4, a winding detection device is provided with a winding detection switch 54 at the tip end 51 of a boom 50, and a winding detection weight 60 from a switch lever 55 via a winding wire rope 56. Is suspended. In the normal state, the switch lever 55 is turned off by the switch lever 55 being pulled down by the winding detection weight 57. When the hook 53 rises and comes into contact with the winding detection weight 60, and the winding detection weight 60 is lifted, the switch lever 55 rotates upward, and the winding detection switch 54 is turned on.
Turns on and the winding state is detected.

In a conventional winding detection weight 60, FIG.
As shown in FIG. 5, the weight body 61 is provided with a mounting hole 62 for mounting the winding wire rope 56 and a vertical insertion hole 63 for inserting the winding wire rope 52. The winding detection weight 60 moves up and down along the wire rope 52 inserted through the insertion hole 63.

[0005]

However, in the winding detection weight 60, when the winding wire rope 52 moves up and down due to the operation of winding up and lowering the hook 53, the winding detection weight 60 is not moved. There is a problem in that the inner peripheral surface of the insertion hole 63 and the outer peripheral surface of the wire rope 52 come into contact with each other, causing wear and shortening the life of the wire rope 52.

Further, the grease applied to the outer peripheral surface of the wire rope 52 may cause the winding detection weight 60 to adhere to the wire rope 52. When the wire rope 52 moves upward in a state where the winding detection weight 60 is adhered to the wire rope 52, the winding detection weight 60 also moves upward. And an erroneous operation of detecting the winding state occurs. If an alarm is issued due to such an erroneous operation of the winding detection device, the operator performs an originally unnecessary operation of stopping the operation of the crane on the hook rising side, and the work efficiency is reduced. Further, in a crane provided with an automatic stop function, there is a problem that the operation to the hook rising side is suddenly stopped while a load is suspended.

[0007] When attaching or detaching the winding detection weight 60 to or from the wire rope 52, conventionally, it is necessary to remove the end of the wire rope 52 from a fixed point and pull it out from the hook 53 before performing the work. Was troublesome. An object of the present invention is to solve the above-mentioned problem in the winding detection device of a crane, and to prevent wear of a wire rope to improve durability, and to prevent malfunction of a winding alarm device. It is an object of the present invention to provide a crane winding detection weight that can be used. It is another object of the present invention to provide a crane winding detection weight that can be easily attached to and detached from a wire rope.

[0008]

A weight for detecting winding of a crane according to the present invention has a vertical insertion groove through which a wire rope for winding is inserted in a weight body, and a wire is provided on the open side of the insertion groove. The above problem is solved by horizontally supporting a roller for preventing the rope from coming off the insertion groove.

When the winding detection weight of the crane of the present invention is used in the winding detection device, a winding wire rope is inserted into the insertion groove, and is held by rollers so as not to be separated from the insertion groove. The winding detection weight moves up and down along the wire rope inserted through the insertion groove. When the wire rope contacts the roller when moving up and down,
Since the roller rotates and rolls along the wire rope, wear of the wire rope is prevented and durability is improved. Also,
There is no erroneous operation in which the winding detection state is detected when the winding detection weight is not in the winding state without the winding detection weight being adhered to the wire rope.

If the roller is detachably supported on the weight body, the winding weight can be attached to or detached from the wire rope while the wire rope remains attached to the hook.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a winding detection weight of a crane according to an embodiment of the present invention, FIG. 2 is a side view of the winding detection weight, and FIG. 3 is a winding detection weight. It is a top view of a weight. Weight 10 for crane winding detection
Is used in a winding detection device, and is similar to the conventional winding detection weight 60 shown in FIG.
Is suspended from a switch lever 55 of a winding detection switch 54 provided at the distal end portion 51 through a winding wire rope 56.

In the winding detection weight 10, a mounting body 12 for mounting a winding wire rope 56 and an insertion groove 13 for inserting a winding wire rope 52 are provided in the weight body 11. . The insertion groove 13 is a U-shaped groove formed in the vertical direction on the front surface of the weight body 11 and has a U-shaped cross section. In order to prevent the wire rope 52 inserted into the insertion groove 13 from coming off from the insertion groove 13, On the open side (front side), a roller 14 is horizontally supported by a shaft 15.

In this winding detection weight 10, a hexagon socket head bolt is used for a shaft 15 that rotatably supports the roller 14, and the shaft 15 and the roller 14 are easily attached to and detached from the weight body 11. You can do it. When the crane winding detection weight 10 is used in the winding detection device, a winding wire rope 52 is inserted into the insertion groove 13 and is held by the rollers 14 so as not to be separated from the insertion groove 13. The winding-over detection weight 10 is connected to the wire rope 5 inserted through the insertion groove 13.
Go up and down along 2.

When the wire rope 52 moves up and down and comes into contact with the roller 14, the roller 14 rotates about the shaft 15 and rolls along the wire rope 52, so that the wire rope 52 is prevented from being worn and durable. improves. Further, there is no erroneous operation in which the winding detection state is detected while the winding detection weight 10 is not in the winding state without the winding detection weight 10 being adhered to the wire rope 52.

The winding detection weight 10 is connected to the wire rope 5
It is not necessary to remove the terminal of the wire rope 52 from the fixed point and pull it out from the hook 53 when attaching or detaching the wire rope 52 from the hook 53. When the shaft 15 and the roller 14 are removed from the weight body 11, the front side of the insertion groove 13 is opened, so that the winding weight 10 can be easily attached to the wire rope 52 with the wire rope 52 still attached to the hook 53. 52 can be attached or detached.

[0016]

As explained above, the winding detection weight of the crane according to the present invention can prevent the wire rope from being worn to improve the durability and prevent the winding over alarm device from malfunctioning. can do. In addition, the work of attaching and detaching to the wire rope can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view of a winding detection weight of a crane according to an embodiment of the present invention.

FIG. 2 is a side view of a winding detection weight.

FIG. 3 is a plan view of a winding detection weight.

FIG. 4 is an explanatory diagram of a configuration of a winding detection device using a conventional winding detection weight.

FIG. 5 is a perspective view of a conventional winding detection weight.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Winding detection weight 11 Weight body 12 Mounting hole 13 Insertion groove 14 Roller 15 Axis 50 Boom 52 Wire rope 53 Hook 56 Winding wire rope

Claims (2)

[Claims] 1. A weight for detecting winding of a crane used in a winding detection device, wherein a vertical insertion groove for inserting a wire rope for winding is formed in a weight body, and an opening side of the insertion groove is provided. A weight for detecting winding over of a crane, wherein a roller for preventing the wire rope from coming off from the insertion groove is horizontally supported. 2. The winding detection weight for a crane according to claim 1, wherein the roller is detachably supported on a weight body.