JP2001206675A - Winch for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fixing action of the end section of a wire rope in a winch and ensure the release stop of the wire rope. SOLUTION: A through hole 31 is formed on a ratchet 29 provided on one side section of the drum 27 of the winch 23, a fixed section 32 having a wedge 33 fixing the wire rope 6 is arranged at the outside section of the ratchet 29, and a ridge-like guide section 35 guiding the wire rope 6 to the fixed section 32 is provided between the fixed section 32 and the through hole 31. The wire rope 6 is extracted to the outside of the ratchet 29 through the through hole 31, and the end section of the wire rope 6 is wound on the wedge 33 of the fixed section 32 to fix the wire rope 6. Since the fixed section 32 is provided on the outside of the drum 27, the wire rope 6 is easily fitted, and the wire rope 6 is made further difficult to release by the frictional force between the ridge-like guide section 35 and the wire rope 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch for a construction machine, and more particularly to a winch for winding and rewinding a wire rope used for suspending a load, a work implement, and the like. The present invention relates to a winch of a construction machine in which an end, which is a base of the wire rope, can be easily and securely fixed to a drum.

[0002]

2. Description of the Related Art In order to wind a wire rope around a winch used in construction machines or the like, it is necessary to fix (or attach) an end of the wire rope to the winch. The fixing method will be described with reference to FIGS.

FIG. 7 shows a wedge-type wire rope fixing method. In FIG. 1A, a winch 1 includes a drum 2 having a large number of wire grooves 2b, and a ratchet 3 fixed to one side of the drum 2 for preventing the drum 2 from rotating in reverse. Have. A notch 2 a for fixing the wire rope 6 to the drum 2 and a wedge 5 are provided at an end of the drum 2 on the side of the ratchet wheel 3, and the end of the wire rope 6 is wound around the wedge 5. Fixed. The drum 2 rotates in the direction of the arrow in FIG. Since the fixed end of the wire rope 6 is not allowed to protrude into the wire groove 2a, it is necessary to store the fixed portion of the wire rope 6 inside the drum as described above. This method of fixing the wire rope 6 is adopted for a relatively thin wire rope 6 because it is very difficult to fasten the wedge 5 in the thick and hard wire rope 6.

FIG. 8 shows a straight-type wire rope fixing method. In this fixing method, a straight wedge 7 is provided in a notch 2b of the drum 2 as shown in FIG. After the end of the wire rope 6 is inserted between the wedge 7 and the ratchet wheel 3, the wire rope 6 is discarded and wound several times (ground winding).
Is fixed. The drum 2 rotates in the direction of the arrow in FIG. This method of fixing the wire rope 6 is used for a relatively thick wire rope 6 because the end of the wire rope 6 is not wound around the straight wedge 7.

FIG. 9 shows a clamp-type wire rope fixing method. In this fixing method, a wire rope 6 is extended from a through hole 3 a formed in the ratchet wheel 3 to the outside of the ratchet wheel 3. The wire rope 6 is fixed by bolts 19 in a state where the inside of the channel-shaped holding member 9 fixed to the ratchet wheel 3 is inserted. The drum 2 rotates in the direction of the arrow in FIG.

[0006]

In the wedge-type wire rope fixing method shown in FIG. 7, the fixing portion must be provided in the drum as shown in FIG. And it is very difficult to tighten the wire rope 6 again when the wire rope 6 is loosened. Further, in the fixing method shown in FIG. 8, since the end of the wire rope 6 is not wound around the straight wedge 7, it is not expected that the wire rope 6 is prevented from coming off only at the fixing portion. There is a problem that a plurality of rows of discarded windings are required, and a safety device for detecting the discarded winding portion is required. There's a problem. In the method of fixing the wire rope 6 shown in FIG.
Since it is outside, there is an advantage that the wire rope 6 is easily fixed, and there is an advantage that a waste winding for fixing the wire rope 6 is not required, but a bolt for fixing the end of the wire rope 6 is used. There is a problem that the fixing force is not so strong and that the effect of preventing the wire rope 6 from coming off when the bolt is loosened cannot be expected.

Accordingly, the present invention has a technical problem to be solved in order to facilitate the fixing operation of the end of the wire rope in the winch and to secure the wire rope from coming off. The invention aims to solve this problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and comprises a drum around which a wire rope is wound, and a drum disposed on one side of the drum.
It has a through hole through which the wire rope penetrates outward from the drum side, and the wire rope wound around the drum is formed by folding the end of the wire rope extending outward by penetrating the through hole. A winch for a construction machine, wherein a fixing portion having a wedge for fixing the wire rope is provided.

A construction machine is provided between the fixing portion and the through hole, and has a mountain-shaped introduction portion for guiding a wire rope extending from the through hole to the fixing portion. The winch is provided.

[0010]

An embodiment of the present invention will be described below in detail with reference to the drawings. A mobile crane as an example of a construction machine to which the present invention is applied will be described with reference to FIG.

Referring to FIG. 1, a mobile crane 11 has a lower traveling body 13 using a crawler as a means for traveling on a ground 12. It has an upper swing body 17 supported.

The upper revolving unit 17 is provided with a boom 21 composed of an outer cylinder 19 and an inner cylinder 20 which is attached to the outer cylinder 19 so as to be extendable and retractable.
The base 1 is pivotally supported on the upper swing body 17 by a support shaft 22. An undulating device 18 for raising and lowering the boom 21 is provided between the upper swing body 17 and the boom 21. The upper revolving unit 17 is provided with a winch 23 for feeding and winding the wire rope 6. The wire rope 6 fed from the winch 23 is connected to the boom 2.
1 and is suspended from the top of the wire rope 6 at the lower end thereof.
A hook 25 for suspending luggage 26 and work implements (not shown) is attached.

When the winch 23 is installed on the upper swing body 17 or when the wire rope 6 is replaced, it is necessary to fix the end (base portion) of the wire rope 6 to a drum of the winch 23, which will be described later. The mechanism for fixing the end of the wire rope 6 will be described with reference to FIGS.

2 and 3, the winch 23 is
Drum 27 having a number of wire grooves 27a
And a ratchet wheel 29 fixed to one side thereof.
The ratchet wheel 29 has a large number of non-return claws on its peripheral surface as shown in FIG. ing.
A boss portion 30 is formed on an outer portion of the ratchet wheel 29, and the boss portion 30 is formed on the ratchet wheel 29 from the drum 27.
A through-hole 31 is formed to reach the peripheral surface of the wire rope 6.
It is for pulling out to the outside.

A fixing portion 32 for fixing an end of the wire rope 6 is fixed to one side of the ratchet wheel 29 as described later, and the fixing portion 32 is provided on the through hole 31 side. It has an open box shape, in which a wedge 33 for fixing the wire rope 6 is fixed. On the peripheral surface of the boss 30, a mountain-shaped introduction portion 35 is formed starting from the through hole 31 and reaching the fixing portion 32. The mountain-shaped introduction portion 35 is formed as shown in FIG. Is formed with a wire groove 30a. The drum 27 and the ratchet wheel 29 rotate counterclockwise in FIG.

The operation of fixing the end (base portion) of the wire rope 6 in the winch 23 configured as described above will be described with reference to FIGS. 2, 4 and 5.

In FIG. 2, the wire rope 6 is connected to the drum 2
7 is inserted into the through-hole 31 and pulled out to the outer surface side of the ratchet wheel 29. Further, as shown in FIG. 4, the wedge 33 in the fixed portion 32 is wound once and pulled out of the fixed portion 32. .

As shown in FIG. 4, while the portion of the wire rope 6 facing the mountain-shaped introduction portion 35 is pulled leftward in the drawing, the portion of the wire rope 6 extending from the fixed portion 32 is indicated by an arrow. , And after the end of the wire rope 6 is tied to the wire rope 6 by a locking wire 36 as shown in FIG. 5, the wire rope 6 is pulled in the direction of the arrow to pull the wire rope 6 The wire rope 6 is pulled to contact the mountain-shaped introduction portion 35.

As described above, by attaching the end of the wire rope 6 to the drum 27 at the side of the ratchet wheel outside the drum 27, the length of the rope pulled out from the fixing portion 32 is increased. In addition to this, the initial tightening work when fixing the wire rope is easy, and the wire rope 6 extending from the fixing portion 32 can be easily fixed.

Further, since the mountain-shaped introduction portion 35 is provided on the upstream side of the fixing portion 32, that is, between the fixing portion 32 and the through hole 31, an initial tightening operation of the wire rope 6 at the time of fixing the wire rope 6 is performed. When the wire rope 6 is extended too much from the winch 23 and the amount of discarded winding is reduced, the frictional force between the mountain-shaped introduction portion 35 and the wire rope 6 causes the wire rope 6 to be fixed to the fixing portion. There is an advantage that it is difficult to come off from 32.

[0021] Further, since there is no need for a conventionally used electrical device safety device such as a detection device for a discarded rope,
Dangerous troubles caused by the failure of the electrical equipment safety device are eliminated, and safety can be improved.

In the above embodiment, the direction of the wedge 33 in the fixing portion 32 is parallel to the outer peripheral surface of the drum 27, but the wedge 33 is connected to the drum 2 as shown in FIG.
The same effect can be obtained even if it is substantially perpendicular to the outer peripheral surface of the base 7. FIG. 6 omits the mountain-shaped introduction portion 35 in order to facilitate the description of the direction of the wedge 33.

In FIG. 6, a fixing portion 37 for the wire rope 6 is provided on the outer side of the ratchet wheel 29.
A wedge 39 is provided in the inside 7 so as to be perpendicular to the outer peripheral surface of the drum 27. In the same manner as in the above-described embodiment, the wire rope 6 pulled out from the through hole 31 of the ratchet wheel 29 is wound around the wedge 39, and then fixed by the locking wire 36 (see FIG. 5). The same fixing work of the wire rope 6 is performed.

Also in this embodiment, the end of the wire rope can be easily and reliably fixed to the fixing portion, and the safety device for the electrical equipment such as the detection device for the discarded rope is not required. Dangerous troubles caused by the failure of the electrical equipment safety device are eliminated, and safety can be improved.

In the above-described embodiment, the case where the present invention is applied to the mobile crane 11 has been described. However, the present invention is not limited to this, and for example, wire ropes such as truck cranes, loading cranes, and overhead cranes are used. Of course, the present invention can be applied to a crane having a winch drum to be wound and a winch other than a construction machine.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0027]

As described above, according to the present invention, since the end of the wire rope is attached to the winch drum at the side of the ratchet wheel outside the drum, the wire rope is pulled out from the fixed portion of the wire rope. The length of the rope end can be increased, the initial tightening work when fixing the wire rope can be easily performed, and the wire rope extended from the fixing portion can be easily fixed.

In addition, by providing a mountain-shaped introduction portion on the upstream side of the fixing portion of the wire rope, that is, between the fixing portion and the through hole, the initial tightening work of the wire rope when the wire rope is fixed becomes easy. In addition, when the wire rope is extended too much from the winch and the discarded winding portion is reduced, there is an effect that the wire rope hardly comes off from the fixing portion due to a frictional force between the mountain-shaped introduction portion and the wire rope.

[0029] Further, since there is no need for a conventionally used electrical device safety device such as a detection device for a discarded rope,
Dangerous troubles caused by the failure of the electrical equipment safety device are eliminated, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a crawler crane according to an embodiment of the present invention.

FIG. 2 shows one embodiment of the present invention, and is a partially cutaway front view of a fixing portion provided outside a winch.

FIG. 3 is a side view showing one embodiment of the present invention, in which a fixing portion shown in FIG. 2 is broken.

4A and 4B show an embodiment of the present invention, wherein FIG. 4A shows a state in which a wire rope is wound around a wedge, and FIG. 4B shows a state in which the rope and the wedge are inserted into a fixed portion. It is.

FIG. 5 shows an embodiment of the present invention and is an operation diagram for fixing a wire rope to a fixing portion.

6A and 6B show another embodiment of the present invention, and FIG. 6A is a partially cutaway view of a fixing portion having a wedge perpendicular to a drum peripheral surface,
(B) is a partially cutaway view of (a).

7A and 7B show an example of a fixing portion of a wire rope in a conventional winch, in which FIG. 7A is a front view and FIG.
It is a vertical side view of the figure.

8A and 8B show another example of a wire rope fixing portion in a conventional winch, in which FIG. 8A is a front view of the fixing portion, and FIG. 8B is a longitudinal sectional front view of FIG.

9A and 9B show still another example of a wire rope fixing portion in a conventional winch, wherein FIG. 9A is a front view and FIG. 9B is a longitudinal sectional side view of FIG.

[Explanation of symbols]

 Reference Signs List 6 wire rope 13 winch 17 upper swing body 21 boom 23 winch 27 drum 29 ratchet wheel 31 through hole 32 fixing part 33 wedge 35 mountain-shaped introduction part 37 fixing part 39 wedge

Claims (2)

[Claims] 1. A drum on which a wire rope is wound, and a through-hole which is provided at one side of the drum and penetrates the wire rope outward from a drum side. The turned wire rope wraps around the end of the wire rope that extends outward by penetrating the through hole,
A winch for a construction machine, comprising a fixing portion having a wedge for fixing the wire rope. 2. A mountain-shaped introduction part formed between the fixing part and the through hole, and guiding a wire rope extending from the through hole to the fixing part. The winch of the construction machine according to 1.