JP2000153991A - Movable crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable crane with a winch arranged so as to provide a wider side view from a cabin all over and improve the stability of a boom, when erected. SOLUTION: A movable crane has a cabin and a revolving frame at the upper part of a body, the revolving frame being pin-connected with the base end thereof in a freely derricking manner, and a boom with the front end beyond the base end moved forwardly across the side of the cabin in travelling attitude. It is provided with a winch bracket 22 fixed to the boom 7 and a winch body 21 secured to the winch bracket 22 and arranged at the side of the boom 7 and at the side of the revolving frame 5 so as to be partially overlapped with the revolving frame 5 in a side view.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile crane, and more particularly to an improvement in the arrangement of winches.

[0002]

FIG. 8 shows a first example of a conventional mobile crane 50. As shown in FIG.
BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of an example and a prior art is demonstrated based on the same figure. At a substantially central portion of the lower traveling body 51 having the traveling device,
The upper swing body 52 is mounted so as to be swingable. A cabin 53 is mounted on one of the left and right sides (the right side in the figure) of the upper revolving unit 52, and a pair of left and right revo frames 54, 54 are fixed to a rear portion of the other side of the upper revolving unit 52. .
The base end of a boom 56 is connected to the upper part between the pair of left and right revolving frames 54 by a foot pin 55 disposed horizontally so as to be able to move up and down. The boom 56 is driven up and down by an up and down cylinder 57. . FIG. 8 shows the traveling posture of the mobile crane 50, in which the distal end of the boom 56 is lower than the base end, and has a downwardly inclined posture. The winch main body 58 for hoisting and lowering the hook is provided on the side of the boom 56 in the lying down state and the cabin 5
3 is located at a position ahead of the eye point P of the operator. In this state, the boom 56 crosses the side surface of the cabin 53 forward at a position below the eye point P, so that the operator can secure a side view.

FIG. 9 and FIG. 10 show a second example of a conventional mobile crane 60.
It is a figure explaining a winch arrangement technology indicated by No. 48 publication. In these figures, two winch bodies 71, 72 are mounted by winch brackets 68, 69 on the side of the boom 66 and at a position behind the eye point P of the operator in the cabin 63, The axis G of the winch main body 72 is higher than the axis F of the winch main body 71 by the length N in the height direction when the boom 66 is in the down state.

As shown in FIG. 10, the winch bodies 71 and 72 are mounted outside the revolving frame 64 fixed to the upper swing body 62 and on the side surface of the boom 66 in plan view. Even when the boom 66 is upright,
The winch bodies 71 and 72 are provided at the rear outer edge C of the upper swing body 62.
-Eliminates protrusion from the C line.

[0005]

However, the above prior art has the following problems. In the first example of the prior art, the winch main body 58 has an eye point P.
Cabin 53 in the running posture
The view from the left side or the front left side in FIG. 8 (the right side or the front right side when the positional relationship between the winch main body 58 and the cabin 53 is reversed) was not good. Further, since the heavier winch body 58 is installed in front of the foot pin 55 and on the side of the boom, the boom weight at the time of boom standing becomes heavier by the weight of the winch body 58 and the stability is not good. There is a problem.

In the second example of the prior art,
Although the field of view on the left or front left of the boom 66 has been improved, when viewed from the left side of the mobile crane, the boom 66 at a position where the revolving frame 64 does not overlap with the winch brackets 68, 69 and the winch bodies 71, 72. Since the rear winch body 72 is located above the winch body 71 because of being mounted on the side surface, the end of the revo frame 64 on the side facing the winch bodies 71 and 72 is largely cut away. Therefore, Revo Frame 6
In order to secure the strength of No. 4, the revo frame 64 must be enlarged rearward. Therefore, the upper revolving unit 62
Since the distance between the rear outer edge CC line of the upper revolving structure 62 and the center of revolving of the upper revolving structure 62 is increased, there is a problem that the rear end turning radius of the upper revolving structure 62 is increased. On the other hand, if the notch of the revolving frame 64 is to be reduced, the winch bodies 71 and 72 must be further disposed in front of the boom 66, and the center of gravity of the boom when the boom stands up moves upward, so that it is stable. There is a problem that the property is impaired.

The present invention has been made in view of the above problems, and the winch is arranged so that the side view from the cabin can be improved over the entire side and the stability when the boom is raised can be improved. It is intended to provide an improved mobile crane.

[0008]

Means for Solving the Problems, Action and Effect In order to achieve the above object, the invention according to claim 1 is provided with a cabin and a revo frame on an upper part of a vehicle body, and a base end portion of the revo frame can be raised and lowered freely. In a mobile crane having a boom that is pin-coupled and has a front end side crossing a cabin side forward from a base end in a running posture, a winch bracket fixed to the boom, and a winch bracket attached to the winch bracket, And a winch main body arranged on the side of the revo frame so as to partially overlap the revo frame in a side view. According to the first aspect of the present invention, the winch main body is installed on the winch bracket fixed to the boom at the side of the boom and at the side of the revo frame so as to partially overlap the revo frame in side view. Is done. For this reason, since the winch is mounted near the base end of the boom as compared with the related art, the position of the center of gravity when the boom stands can be lowered. Therefore, vehicle stability during crane operation can be improved.

According to a second aspect of the present invention, in the mobile crane of the first aspect, the winch body is mounted behind the eye point P of the operator.
According to the second aspect of the present invention, since the winch body is mounted behind the eye point P of the operator, the winch does not obstruct the side view of the operator,
Therefore, the side view from the cabin can be improved. In addition, even if the winch body is shifted rearward, the winch body partially overlaps with the revolving frame, so that it is not necessary to provide the revolving frame so as to protrude rearward, and the rear end turning radius of the upper turning body can be reduced.

According to a third aspect of the present invention, in the mobile crane according to the first aspect, the winch main body is mounted so as to be substantially overlapped with the side surface of the boom in a side view. Claim 3
According to the invention described in (1), since the winch main body is mounted so as to be substantially overlapped with the boom side in a side view, the portion of the winch main body protruding from the upper surface of the boom is very small, and the winch obstructs the side view of the operator. Is lost. Therefore, the side view from the cabin 4 can be improved.

According to a fourth aspect of the present invention, in the mobile crane according to the first aspect, the revolving frame to which the boom is pin-connected is attached to an upper revolving body that is rotatably mounted on a vehicle body, and a winch is provided. The main body is configured to be located within the rear end turning radius of the upper turning body when the boom is at its maximum standing position.
According to the fourth aspect of the present invention, the winch body when the boom is upright is located within the turning radius of the rear end of the upper revolving structure. The distance does not increase. Thereby, the minimum value of the rear end turning radius of the upper turning body can be maintained.

According to a fifth aspect of the present invention, in the mobile crane according to the first aspect, a revolving frame to which a boom is connected by a pin is attached to an upper revolving body rotatably mounted on a vehicle body, and a winch is provided. The main body is mounted at a position behind the eye point P of the operator, substantially overlapping with the side surface of the boom when viewed from the side, and within the turning radius of the upper turning body when the boom is upright. According to the fifth aspect of the present invention, since the winch main body is disposed at a position on the base end side of the boom behind the eye point P, it does not obstruct the operator's side view, and
The position of the center of gravity at the time of boom standing is lowered, and stability can be improved. Further, since the winch main body is mounted so as to substantially overlap with the boom side surface in a side view, a portion protruding from the boom is reduced, and visibility of the boom side is improved. Furthermore, since the winch main body is mounted at a position within the rear turning radius of the upper revolving structure when the boom is upright, the winch does not protrude from the rear outer edge of the upper revolving structure when the boom is upright. Rear end turning radius can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mobile crane according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a left side view of the mobile crane in a running posture, and FIG. 2 is a plan view. In these figures, an upper revolving unit 3 is mounted at a substantially central portion of the lower traveling unit 2 so as to be rotatable with respect to the lower traveling unit 2. A cabin 4 is disposed on one of the left and right sides (the right side in the present embodiment) of the upper part of the upper revolving unit 3, and a pair of left and right revolving frames 5 and 5 are fixed to the rear end of the other side. I have. The upper portion of the base end of the base boom 8 of the boom 7 is connected to the upper portion between the pair of left and right revolving frames 5 and 5 by a foot pin 6. An up-and-down cylinder 9 is rotatably mounted between the boom 7 and the upper swing body 3.
It comes to undulate. A crane hook 24 is attached to the tip of the boom 7. In the running posture shown in FIG. 1, the boom 7 is stored in a state in which the front is lowered from the rear to the front, and crosses the side of the cabin 4 forward at a position below the eye point P of the operator. A winch body 21 is provided on the side of the boom 7.
However, so that it partially overlaps with the revo frames 5 and 5 in side view,
Also, it is mounted so as to substantially overlap the side surface of the boom 7.

FIG. 3 is a detailed plan view of the mobile crane according to the present invention, with a winch main body 21 for lifting and lowering the hook. As shown in FIG.
A winch bracket 22 is fixed to the front end of the winch bracket 22 on the side of the boom 7 and on the side of the revo frame 5 so as to partially overlap the revo frame 5 in a side view. The winch body 21 is installed. The base end of the winch bracket 22 is attached to the boom 7 (here, on the side surface of the boom 7).
At its tip, the winch body 21
Is installed. In addition, the winch body 21 and the boom 7
A predetermined gap is provided between the revolving frame 5 and the revolving frame 5. In this manner, the winch main body 21 is disposed at a position on the base end side of the boom 7 and at a position partially overlapping the revo frame 5 in a side view.
Therefore, when the boom 7 stands up, the winch body 21
Is lower than in the prior art, so that the position of the center of gravity can be lowered and the stability during crane operation can be improved.

Further, by disposing the winch main body 21 at the base end side of the boom 7, the distance between the winch main body 21 and the sheave 23 mounted on the tip of the boom 7 is increased as shown in FIG. As a result, it is easy to secure the fleet angle α of the wire rope between the winch body 21 and the sheave 23 within the reference value. , Deformation and damage can be prevented, and work safety can be improved.

FIG. 4 is a detailed side view of FIG. 3, and is an explanatory view of a mounting portion of the winch body 21. In the figure, the winch main body 21 is mounted behind the operator's eye point P, and is arranged so as to partially overlap the revo frame 5 in a side view. In addition, the winch main body 21 is
It is arranged so as to substantially overlap the side surface when viewed from the side. Thus, the winch bracket 22 for attaching the winch body 21 is fixed to the side surface of the boom 7, and the winch bracket 22 and the winch body 21 are attached to the upper surface 7 of the boom 7 in side view.
a, the winch main body 21 is disposed rearward of the operator's eye point P, and the winch main body 21 is mounted so as to substantially overlap the side surface of the boom 7 when viewed from the side. The winch bracket 22 does not obstruct the operator's left or boom side view. Therefore, the left-side view from the cabin 4 in the traveling posture (the right-side view for a vehicle in which the relationship between the cabin 4 and the winch is reversed) is improved.

3 and 4, the winch body 2
Numeral 1 is arranged outside the revo frame 5 and partially overlaps with the revo frame 5 in a side view. However, since the winch bracket 22 is mounted on the boom 7 and the winch main body 21 is arranged via the winch bracket 22 outside the revo frame 5 and at a position partially overlapping the revo frame 5 in side view, In the vicinity of the winch body 21, interference with the winch body 21 can be avoided without forming an unreasonable shape with a notch or the like as in the related art. In this way, the required strength of the revolving frame 5 can be ensured, and the occurrence of stress concentration or the like on a part of the revolving frame 5 during work can be avoided. Therefore, the structure of the revolving frame 5 which is important in the structure of the mobile crane is changed to the winch body 2.
1 can be made strong without being affected by the mounting position, and thus cracks and breakage can be prevented.

Here, when the boom 7 in the running posture of FIG. 1 is set to the maximum standing state, the side view shown in FIG. 5 and the plan view shown in FIG. 6 are obtained. As shown in FIG. 6, the winch main body 21 when the boom is upright is provided with a rear end turning radius R of the upper turning body 3.
The winch main body 21 can be arranged in the rear outer edge CC line of the upper swing body 3 in the boom maximum standing state. Therefore, it is not necessary to increase the rear end turning radius R of the upper turning body 3 for mounting the winch body 21, and therefore there is no possibility of interfering with surrounding objects even in a narrow place, and the workability is good.

FIG. 7 shows two winch bodies 25 and 2
6 shows another embodiment in which No. 6 is mounted. Two winch bodies 2
Reference numerals 5 and 26 are mounted behind the eye point P of the operator. Although not shown, the two winch bodies 25 and 26 are installed so as to substantially overlap the side surface of the boom 7 in a side view. Then, similarly to the embodiment having one winch, the winch main body 25, 26 when the boom is upright at the maximum.
Is configured to fit within the rear end turning radius R of the upper turning body 3.

As described above, by disposing the winch main body at the position rearward of the boom 7 and substantially overlapping the revolving frame 5 in a side view, the position of the center of gravity when the boom stands can be lowered. In addition, since the winch bodies 25 and 26 are disposed behind the eye point P of the operator, the winch bodies 25 and 26 do not obstruct the left side view of the operator, and the boom side from the cabin 4 is provided. Improves direction of view. And the winch body 2
Since the portions 5 and 26 project very little from the upper surface of the boom 7, the side visibility on the boom side can be further improved. Also, since the two winch bodies 25 and 26 are disposed on the base end side of the boom 7, as shown in FIG.
The distance between the two winch bodies 25, 26 and the respective sheaves mounted on the end of the boom, around which the wire ropes are wound from the winch bodies, can be increased, whereby each winch body and By reducing the fleet angle α of the wire rope between the wire rope and the sheave, it is possible to prevent the wire rope from being wound, deformed, or damaged.

[Brief description of the drawings]

FIG. 1 is a side view of a mobile crane according to the present invention.

FIG. 2 is a plan view of the above.

FIG. 3 is a plan view of the mobile crane according to the present invention, in which a winch is mounted on a boom side surface.

FIG. 4 is a side view of the above.

FIG. 5 is a side view of the mobile crane according to the present invention in a state in which the boom is mounted upright on a side surface of the boom.

FIG. 6 is a plan view of the above.

FIG. 7 shows two movable cranes according to the present invention on the side of the boom.
FIG. 4 is a plan view in which pieces of winch are mounted.

FIG. 8 is a side view of a first example of a conventional mobile crane.

FIG. 9 is a side view of a second example of the conventional mobile crane.

FIG. 10 is a plan view of a second example of a conventional mobile crane.

[Explanation of symbols]

 2, 51, 61 Lower traveling structure 3, 52, 62 Upper revolving structure 4, 53, 63 Cabin 5, 54, 64 Revo frame 6, 55, 65 Foot pin 7, 56, 66 Boom 7a Boom upper surface 8 Base boom 9, 57, 67 Raised and lowered cylinders 21, 25, 26, 58, 71, 72 Winch body 22, 68, 69 Bracket 23 Sheave 24 Hook F, G Winch axis P Eye point R Rear turning radius of upper revolving structure α Fleet angle

Claims (5)

[Claims] 1. A cabin and a revo frame are provided on an upper part of a vehicle body, and a base end is connected to the revo frame by a pin so as to be able to move up and down, and a boom having a front end side crossing the cabin side forward from the base end in a running posture. In a mobile crane, the winch bracket (22) fixed to the boom (7) and the winch bracket (22) are attached to the side of the boom (7) and the side of the revoframe (5). The winch body (2) that is arranged to partially overlap with the revoframe (5) in side view
(1) A mobile crane comprising: 2. The mobile crane according to claim 1, wherein the winch body (21) is mounted behind the eye point P of the operator. 3. The mobile crane according to claim 1, wherein the winch body (21) is mounted so as to substantially overlap with the side surface of the boom (7) in a side view. 4. The mobile crane according to claim 1, wherein the revolving frame (5) to which the boom (7) is pin-connected is attached to an upper revolving unit (3) rotatably mounted on a vehicle body. The mobile crane characterized in that the winch body (21) is located within the rear end turning radius of the upper swing body (3) when the boom (7) is at its maximum standing position. 5. The mobile crane according to claim 1, wherein a revolving frame (5) to which a boom (7) is connected by a pin is attached to an upper revolving unit (3) rotatably mounted on a vehicle body. The winch body (21) is located rearward of the operator's eye point P, substantially overlaps the side surface of the boom (7) in side view, and is within the rear end turning radius of the upper revolving unit (3) when the boom is upright. A mobile crane characterized by being mounted at a position.