JP2002003168A - Structure of winch attaching part in crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of attaching a winch with a winch attaching member comprised of plates to reduce the weight, sufficiently durable against the applied load, and without hindering the drum attaching work. SOLUTION: A winch and a mast in a crane are attached to the winch attaching member comprised of a pair of left/right plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a winch mounting portion in a crane.

[0002]

2. Description of the Related Art Conventionally, in a crawler crane or the like, a mast mounting portion mounted on a revolving frame is provided with a separate component from the revolving frame in order to avoid a winch, and is extended upward. For this reason, the mounting position is limited, and the number of parts increases, resulting in poor assemblability.

[0003] Further, since a large load is applied to the mast mounting portion, the structure of the mounting part is complicated in order to increase the strength, and there is a problem in productivity.

FIG. 2 shows an example of such a case, in which a mast mounting member 3 which is a separate component from the winch drum 2 is provided on the revolving frame 1. Mast mounting member 3
Was attached to the support bracket 4 or 5 provided on the frame 1 with the pin 6. The mast 7 was pivotally supported at the top of the mast mounting member 3 at its lower end by a pin 8.

In such a configuration, since the mast mounting member 3 receives the acting force from the mast 7 only by the pins, the pins become thick, and the workability of inserting and removing the pins is poor.

When the drum 2 is replaced, the mast mounting member 3
Has to be removed, so there is a problem that it takes time again.

FIG. 3 shows another example of the mounting structure. In this example, the winch mounting member 3 'is fixed on the revolving frame 1 by welding or the like and protrudes upward. Become. In addition, since the size of the member is limited to prevent interference with the drum, it is difficult to provide sufficient strength. Specifically, since the fixing area of the member 3 'cannot be increased, the extended line of the mast 7 is disengaged from the fixing portion of the member 3' in the case as shown in FIG. 4, that is, as shown by the dashed line in FIG. Therefore, the strength of the fixed portion of the member 3 'tends to be insufficient, and a bending force acts.

Further, even if the structure of the revolving frame 1 is simplified by using the member 3 'as a support structure with the pin 3a as shown in FIG. 5, the distance between the pin 3a and the pin 3a cannot be sufficiently taken. Must be increased, and as a result,
The assemblability deteriorates. When the drum 2 is replaced, the drum 2 must be prevented from hitting the winch mounting member 3 ', so that there is a problem in workability.

As shown in FIG. 2, in the case of the pin connection as shown in FIG. 2, the load is supported by the pin, so that the diameter of the pin becomes large.
In the case where the winch mounting member is mounted on the revolving frame 1 by welding as shown in FIG. 3, or in the case of a support structure using the pin 3a as shown in FIG. For this reason, the structure becomes complicated and the weight becomes heavy. Further, the production of the revolving frame was obstructed by canning, machining, and the like, and a reduction in productivity was inevitable.

[0010]

The winch mounting member is constituted by a plate to reduce the weight and to sufficiently withstand the applied load, and does not hinder the drum mounting operation. Provide a winch mounting structure.

[0011]

(1) A winch and a mast of a crane are mounted on a winch mounting member composed of a pair of left and right plates. (2) At the lower center of the winch mounting member composed of the pair of left and right plates, a downward projecting portion facing the revolving frame with a small gap is provided. (3) The lower end of the mast such as a backstop is supported at the upper center of the winch mounting member.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. Figure 1
1 is a revolving frame and 2 is a drum. Reference numeral 9 denotes a winch mounting member according to the present invention, which includes a pair of left and right plates provided on both sides of the drum 2. The winch mounting member 9 has a mast mounting portion at the upper center in the left and right, and the lower end of the mast 7 is pivotally supported by the pin 8 here.

Both lower ends of the winch mounting member 9 are mounted on mounting members 10 fixed on the revolving frame 1 with pins 11.

Numeral 12 denotes a downward projecting portion provided at a lower portion of the winch mounting member 9, and a small gap δ (FIG.
b). When the load applied to the mast 7 increases, the small gap δ bends downward and is supported against the upper surface of the turning frame 1. By providing the small interval δ, the tolerance of the mounting pin and the pin hole can be made large, so that the manufacturing efficiency of the pin and the pin hole is improved.

When the drum is replaced, the entire mast mounting member 9 may be removed, so that the operation is easy. The position, shape, and gap δ of the downward projecting portion 12 are determined according to the diameter of the pin 11. Now, the plate bends due to the acting force from the mast 7, but when a certain load is exceeded, the downward projecting portion 12 of the plate hits the upper surface of the revolving frame 1 and receives a load at this contact portion. It is safe because it will not increase any more.

[0016]

Since the winch mounting member serves as both the mast mounting portion and the winch mounting portion, the number of components is reduced, and the disassembly and assemblability is improved.

Also, since the mast mounting portion is a plate,
The structure has been simplified, the weight has been reduced with the improvement of productivity.

Since the downwardly projecting portion is provided, when the load exceeds a certain load, it comes into contact with the revolving frame and receives the load, so that the protection of the pin is also perfect. Further, since the load can be supported by the downward projecting portion, the diameter of the pin can be reduced by that amount, the detachability of the pin is improved, and the disassembly and assembly is facilitated.

Since the winch mounting member is a separate part from the revolving frame 1, the structure of the revolving frame is simplified, which contributes to an improvement in productivity.

[Brief description of the drawings]

FIG. 1a is a side view showing the structure of the present invention. FIG. 2B is a detailed view of the part of FIG.

FIG. 2 shows a first example of a known mounting structure.

FIG. 3 shows a second example.

FIG. 4 is an explanatory view showing a problem in strength of a known mounting structure.

FIG. 5 is a diagram showing a third example of the known mounting structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Revolving frame 2 Winch drum 3.3 3 'Mast mounting member 4.5 Support bracket 6.8 pin 7 Mast 9 Winch mounting member 10 (Mounting winch mounting member on revolving frame) Mounting member 11 Pin 12 Downward projection

Claims (3)

[Claims] 1. The structure of a winch mounting portion of a crane in which a winch and a mast of the crane are mounted on a winch mounting member composed of a pair of left and right plates. 2. The structure of a winch mounting portion in a crane according to claim 1, further comprising a downward projecting portion facing a revolving frame with a small gap at a center lower portion of the winch mounting member composed of the pair of left and right plates. . 3. The structure of a winch mounting portion in a crane according to claim 2, wherein a lower end of a mast such as a backstop is supported at a central upper portion of the winch mounting member.