JPH05270790A - Rope slip-off stopper - Google Patents

Abstract

PURPOSE:To restrain a rope in movement only in the crosswise direction, not in the movement ahead, when the rope is pulled from a boom ahead obliquely. CONSTITUTION:A rope slipoff preventive device to prevent a rope from slipping off from a guide sheave 2 and point sheave 3 furnished at the tip of a boom has a pair of slipoff preventing members 121, 122, which are arranged opposedly while at least rope leading from the guide sheave 2 to point sheave 3 is pinched and prevent deroping through restraining its movement only in the direction across the sheave thickness with no restraint applied to the rope motion in the sheave radial direction. Even though the rope leading from the guide sheave 2 to point sheave 3 is pulled ahead from the boom tip, for example, in works for a drag line, the rope is free from restraint by the slipoff preventing members, which allows prolongation of the rope lifetime. Therein crosswise movement of the rope is restrained by the slipoff preventing members 121, 122, so that deroping can be surely precluded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope stopper device for preventing a rope from coming off from a guide sheave and a point sheave provided at the tip of a boom of a crane.

[0002]

2. Description of the Related Art FIG. 5 is a view for explaining a conventional rope slip prevention device. In the figure, a main auxiliary winding guide sheave 2 and a point sheave 3 are provided at the tip of the boom 1, respectively, and a main winding and auxiliary winding rope 4 wound by a winch (not shown) are provided on the guide sheave 2 and the point sheave 3. It is wrapped around each. FIG. 5 shows a state in which only the main winding rope 4 is wound. Reference numeral 5 is a rope stopper formed by connecting a plurality of semi-circular stopper members 5a with a bracket 5b, and is attached to the tip wall surface 1a of the boom 1 so as to cover the peripheral edge of each point sheave 3 for about half a circumference. , 6b. The main winding rope 4 passes between the guide sheave 2 and the point sheave 3 and the bracket 5b and is wound around the point sheave 3. Between the guide sheave 2 and the point sheave 3, the main winding rope 4 is detached by the bracket 5b. The rope is prevented, and the main winding rope 4 is prevented from being pulled out by the member 5a below the bracket 5b. Reference numeral 7 is a gate-shaped rope provided at a position where the rope starts to wind around the guide sheave from a winding winch (not shown), and acts to prevent the rope from being unwound even if the rope dances.

[0003]

However, in the work of flying the bucket far while swinging like the excavation work with the drag line bucket, the main hoist rope 4 is pulled diagonally forward of the boom 1 as shown in FIG. The main winding rope 4 may come into contact with the bracket 5b, resulting in severe wear of the rope 4 or damage to the bracket 5b.

An object of the present invention is to restrain not only forward movement of the rope but also lateral movement thereof when the rope is pulled diagonally forward of the boom, so that the rope does not come into contact with the detent and its life is reduced. It is an object of the present invention to provide a rope detent device for improving ropes and preventing damage of the detents.

[0005]

The present invention will be described with reference to FIG. 1 showing an embodiment. In the present invention, the rope is prevented from coming off from the guide sheave 2 and the point sheave 3 provided at the tip of the boom. Applied to the sheave prevention device, and is arranged opposite to each other with at least the rope extending from the guide sheave 2 to the point sheave 3 interposed therebetween. The rope movement in the sheave radial direction is regulated without restricting the movement of the rope in the sheave radial direction. Pair of detent members 121, 1 for preventing
The provision of 22 achieves the above-mentioned object.

[0006]

For example, during the drag line work, even if the rope extending from the guide sheave 2 toward the point sheave 3 is pulled forward from the tip of the boom, the rope is not restrained by the stopper so that the life of the rope can be extended. Further, at this time, the movement of the rope in the lateral direction does not come off.
Since it is restrained by 1,122, it is possible to reliably prevent the rope from being pulled out.

Incidentally, in the section of means and action for solving the above-mentioned problems for explaining the constitution of the present invention, the drawings of the embodiments are used for the purpose of making the present invention easy to understand. It is not limited to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rope slip prevention device according to the present invention will be described with reference to FIGS. As shown in FIG. 4, axles 11 and 12 are axially supported by a pair of side panels 1a facing each other at the tip of the boom 1, and a pair of main and auxiliary guide sheaves 2 are rotatable around the axle 11. And four point sheaves 3 for main winding and auxiliary winding are rotatably mounted on the axle 12. In FIG. 1, reference numeral 20 denotes an anti-slip device in which a main-slip anti-slip 20A and a supplementary anti-slip 20B are integrally configured.
The main winding and auxiliary winding stoppers 20A and 20B are a pair of substantially J-shaped stopper plates 121 and 12 respectively.
2 and 221, 222, and substantially C-shaped stopper plates 123, 223.

An overhanging plate 121a is provided at the upper end of one J-shaped deviation preventing plate 121 for the main winding, and a collar 31 which is loosely inserted into the guide sheave axle 11 is provided at the tip of the overhanging plate 121a. A retaining ring 41 is provided at the lower end. The other J-shaped deviation prevention plate 122 for main winding is provided with an overhanging plate 122a at the upper end, the tip of the overhanging plate 122a is provided with a collar 32 that is loosely inserted in the guide sheave axle 11, and at the lower end. A retaining ring 42 is provided. A protruding plate 221 is provided on the upper end of one J-shaped stopper plate 221 for auxiliary winding.
a is provided, and the tip of the overhanging plate 221a has the above-mentioned collar 3
2 and is provided with a retaining ring 43 at the lower end. An overhanging plate 222a is provided on the upper end of the other J-shaped disengagement prevention plate 222 for auxiliary winding.
A collar 33 is provided at the tip of a and a retaining ring 44 is provided at the lower end.

C-shaped disengagement prevention plate 123 for the main winding
Is provided with an overhanging plate 123a at one end of the overhanging plate 12a.
3a is connected to a collar 51 which is loosely inserted in the point sheave axle 12 and has a retaining ring 45 at the lower end.
Is provided. An overhanging plate 223a is provided at the upper end of the C-shaped shift prevention plate 223 for auxiliary winding, the tip end of the overhanging plate 223a is connected to the collar 51, and the lower end is connected to the retaining ring 45. J-shaped stopper plate 121-222 and C-shaped stopper plate 12
One connecting shaft 46 is inserted through the holding rings 41 to 45 provided on the Nos. 3,223, and the respective retaining plates are integrally connected.

A description will be given of the operation of preventing the rope from slipping off by the rope slip-off preventing device thus constructed. Conventionally, a bracket 5b shown in FIG. 5 is provided at a position where the rope starts to wind around the guide sheave 2 to the point sheave 3,
Between the guide sheave 2 and the point sheave 3, the rope was prevented from dancing in front of the boom to prevent the rope from being pulled out. In the present invention, J-shaped disengagement prevention plates 121 and 122 that extend so as to sandwich the rope from the guide sheave 2 side toward the point sheave 3 side are provided, and the rope sideways between the guide sheave 2 and the point sheave 3 are provided. It regulates the movement in the direction to prevent the rope from being pulled out.

When the bucket is thrown to the front of the work machine while turning like a drag line work, the bucket rope is pulled diagonally forward of the work machine. At this time, the rope extending from the guide sheave 2 to the point sheave 3 faces forward from between the disengagement prevention plates 121 and 122, and the rope may be restricted by the disengagement prevention member in the forward direction of the work machine (sheave radial direction). Absent. The movement of the rope in the lateral direction is restricted by the rope coming into contact with the side surfaces of the stopper plates 121 and 122, thereby preventing the rope from being unwound.

The unwinding of the rope wound around the point sheave 3 is carried out in the same manner as in the conventional case, by the C-shaped disengagement prevention plate 12
3 and the J-shape are prevented by the semicircular arc portion of the stopper plate 122.

In the above description, the J-shaped stopper plates 121 and 122 are used to prevent the rope from being unwound between the guide sheave 2 and the point sheave 3, and to prevent the rope from being wound around the point sheave 3. Although the pulling out is prevented, the present invention is characterized in that the pulling out of the rope is prevented by restraining only the lateral movement of the rope between the guide sheave 2 and the point sheave 3. A pair of strips are arranged to face each other so as to sandwich the rope between the sheave 2 and the point sheave 3, and apart from the strips, a substantially C-shaped stopper plate is provided along the semicircle of the point sheave 3. The rope may be provided to form a stopper member. Further, although the retaining member is formed of a plate, it may be formed of a round bar, a square bar, a pipe or any other material.

[0015]

According to the present invention, a pair of anti-separation members are provided so as to face each other so as to sandwich the rope facing the guide sheave side toward the point sheave side. The movement of the rope is not regulated, and only the lateral movement is regulated to prevent the rope from being unwound, so the rope does not contact the detent member, the life of the rope can be improved, and the detent device is damaged. Can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of a rope slip-off prevention device according to the present invention.

FIG. 2 is a plan view of a boom equipped with a rope slip prevention device according to the present invention.

3 is a side view of the boom of FIG.

FIG. 4 is a front view of the boom of FIG.

FIG. 5 is a side view of a boom equipped with a conventional rope detent device.

[Explanation of symbols]

1 Boom 2 Guide sheave 3 Point sheave 4 Rope 11, 12 Axle 20 Anti-slip device 20A Main winding anti-separation 20B Supplementary winding anti-separation 31-33 Color 41-45 Color 46 Shaft 51 Color 121, 122, 221, 222 J C-shaped stopper plate 123,223 C-shaped stopper plate

Claims (1)

[Claims] 1. A rope stopper device for preventing a rope from coming off from a guide sheave and a point sheave provided at a tip of a boom, wherein the rope is arranged so as to face each other at least with a rope facing the point sheave from the guide sheave interposed therebetween. A rope anti-slip device comprising a pair of anti-slip members for restricting the movement of the rope in the thickness direction of the sheave and preventing the rope from being pulled out without restricting the movement of the rope.