JPH0664894A - Wire rope return device for crane boom - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a device that, when the wire rope loosens and hangs down on the outer surface of the boom of a crane, tension is applied to the wire rope to smoothly return the wire rope to the back of the boom. To do. [Structure] A buffer pedestal 9 is fixed to a main member 4 of a boom via a U bolt 10. A guide bracket 11 having a guide inclined surface 11a that inclines inward is attached to the U bolt 10 by welding. The hanging wire rope 5 causes a,
It is displaced like b and c and returns to the d position on the back surface of the boom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffer receiver installed on the rear surface of a boom when a hoisting wire rope in a crawler crane is loosened and hangs down on the outer surface of the boom, when the wire rope is tensioned. The present invention relates to a wire rope returning device that allows a wire rope to return to the back of a boom without being caught by a stand.

[0002]

2. Description of the Related Art First, a conventional wire rope sag prevention device for a crawler crane will be described with reference to FIGS.

FIG. 4 shows an example of a crawler crane, in which a revolving structure 2 is rotatably mounted on an upper part of a tracked traveling structure 1. A boom B including a lower boom 3 and an upper boom 4 connected to the lower boom 3 is attached to a front portion of the revolving structure 2 by a pin so that the boom B can be hoisted. A hoisting wire rope (hereinafter referred to as a wire rope) 5 unwound from a winch installed on the revolving structure 2 is hung around the sheave of the hook 6 through a sheave attached to the tip portion of the upper boom 4, and its end portion is It is connected to the tip of the boom 4. By driving the winch to reel out and wind the wire rope 5, the hook 6 is lowered and raised.

At the lower part of the upper boom 4, a wire rope 5
A device is provided to prevent the boom B from hanging down when it sags. The device consists of the structure shown in FIGS. The lower end of the pipe 7 that prevents the wire rope 5 from hanging down is connected to the lower main member 4b of the upper boom 4 via a U bolt 8.
The intermediate portion of is connected to a channel type buffer pedestal 9 installed on the main member 4a on the upper side of the upper boom 4. The buffer pedestal 9 is fixed to the main member 4a by U bolts 10, and a buffer 11 is attached to this. Even if the wire rope 5 sags, the pipe 7 prevents the boom B from hanging down to the outer surface.

[0005]

However, since the pipe 7 is long, it must be removed when the crawler crane is transported, which is troublesome. The present invention has been made in view of this, and even if the wire rope hangs down on the outer surface of the boom, when the wire rope is tensioned, the wire rope is smoothly guided to return to the back surface of the boom. It is an object of the present invention to provide a return device of the.

[0006]

[Means for Solving the Problems] A first means for achieving the above object is to attach a guide bracket having a guide inclined surface that inclines inward and downward to a U bolt fixed to an outer portion on the back side of a boom. It is characterized by that. The second means is characterized in that a guide bracket having a guide inclined surface that inclines downward toward the inside is attached to the outer end of the buffer pedestal fixed on the back surface of the boom.

[0007]

[Operation] When the wire rope hangs down on the outer surface of the boom, when tension is applied to the wire rope, the wire rope is guided and moved by the guide inclined surface of the guide bracket, and the wire rope is not caught on the buffer pedestal but on the rear surface of the boom. Return to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. In both figures, the same members as those in FIGS. 5 and 6 are designated by the same reference numerals.

A guide bracket 11 having a guide inclined surface 11a inclined downward toward the inside is attached to the U bolt 10 by welding. As shown in FIG. 2, the wire rope 5 hanging down to the outer lower position a of the bracket 11
When tension is applied to the wire rope 5, the wire rope 5
Is guided to move to the b position, and then returns to the d position on the back surface of the boom B after passing the c position.

FIG. 3 shows a guide inclined surface 1 inclined downward inward.
2nd Example which fixed the guide bracket 12 which formed 2a to the bottom face of the outer end part of the buffer pedestal 9 with the bolt 13 is shown. The operation of this embodiment is similar to that of the first embodiment.

[0011]

According to the present invention described above, the guide bracket is attached to the U-bolt fixed to the outer side of the rear side of the boom or the outer end of the buffer pedestal fixed to the rear side of the boom. With a simple configuration, when the wire rope hangs down on the outer surface of the boom, tension is applied to the wire rope, so that the wire rope can be smoothly returned to the back surface of the boom. Also,
A return device can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention,

2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a side view showing a second embodiment of the present invention,

FIG. 4 is a side view showing an example of a conventional chloracurene equipped with a device for preventing the wire rope from hanging down to the outside of the boom.

FIG. 5 is a side view showing a conventional device for preventing the wire rope from hanging down to the outside of the boom;

6 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 2 Revolving structure 3 Lower boom 4 Upper boom 4a Main material 4b Main material 5 Hoisting wire rope 9 Buffer pedestal 10 U bolt 11 Guide bracket 11a Guide slope 12 Guide bracket 12a Guide slope 13 Bolt

Claims (2)

[Claims] 1. In a crane in which a wire rope operated by a winch is arranged on the rear surface of a boom, a U-bolt fixed to the outer portion on the rear surface side of the boom is provided with a guide bracket having a guide inclined surface that inclines inward downward. A wire rope restoring device characterized by being attached. 2. In a crane in which a wire rope operated by a winch is arranged on the rear surface of a boom, a guide having a guide inclined surface that inclines inward and downward is formed at an outer end portion of a buffer pedestal fixed on the rear surface of the boom. A wire rope restoring device characterized by having a bracket attached.