JPH0639316B2 - Wheel crane - Google Patents

Description

The present invention relates to a wheel crane provided with a cabin (driver's cab) which is commonly used during crane operation and traveling operation.

[Conventional technology]

The structure of this type of wheel crane will be described with reference to the example disclosed in Japanese Patent Application Laid-Open No. 63-37097 (see FIGS. 4 and 5) filed by the present applicant.

In both figures, A is the undercarriage and B is the undercarriage A
An upper revolving structure 2, which is rotatably mounted on a revolving bearing 1 above, is a revolving frame of the upper revolving structure A. The revolving frame 2 is provided with a cabin 3 and a boom 4.

Among them, the cabin 3 is displaced to the left or right side (usually the right side as shown in the figure, which will be described in the following) with respect to the swing center O of the upper swing body B, and the boom 4
Are arranged at positions where their center lines 1 overlap the turning center O in the lying state. Reference numeral 5 denotes a boom foot pin which serves as a center of ups and downs of the boom 4.

In addition, a boom hoisting cylinder 6 for hoisting the boom 4
Is on the boom center line 1 on the lower side of the boom (the lower side in the collapsed state of the boom, the same regarding the up and down direction of the boom 4 described below), with the rod end on the lower surface of the boom and the tube end on the revolving frame 2. It is pivotally attached.

In the figure, 7 is a counterweight attached to the rear end of the revolving frame 2. The wire rope, winch, outrigger, etc., which are the standard equipment of the crane, are not shown.

In the wheel crane having this structure, the boom 4 crosses the left side of the cabin 3 as shown in the drawing when the vehicle is in a lying state.

In this case, the boom 4 is at the lowest position, that is,
If the driver crosses the side of the cabin at a position as low as possible below the normal viewpoint position (so-called eye point) P of the driver in the cabin 3 in the vertical and horizontal directions, the side view at the time of traveling is improved and the driver It is less fatigued, which is preferable for driving safety.

In this respect, in the conventional crane, the boom 4 is laid down at the lowest possible position by pivotally attaching the upper surface side of the boom base end to the revolving frame 2.

[Problems to be Solved by the Invention]

However, in the swing center O where the boom hoisting cylinder 6 overlaps when the boom is lying down during traveling, the pipes (hydraulic pipes and electric wiring) of both the lower traveling body A and the upper revolving body B are freely rotatable around the swing center O. The connecting rotary joints 8 are arranged vertically. The rotary joint 8 is formed by vertically connecting a slip ring 8a for connecting electric wiring and a swivel joint 8b for connecting hydraulic pipes, and the slip ring 8a projects toward the upper revolving superstructure B side to form a swivel center O. Placed on top.

Therefore, the boom hoisting cylinder 6 must be arranged above the rotary joint 8 in order to avoid interference with the rotary joint 8 (slip ring 8a), and the boom position becomes higher accordingly. Therefore, the purpose of improving the lateral field of view during traveling has not been sufficiently achieved.

Therefore, the present invention provides a wheel crane capable of maximizing the boom position while avoiding interference between the rotary joint and the boom hoisting cylinder.

[Means for Solving the Problems] According to the invention of claim 1, an upper revolving structure is mounted on a lower traveling structure, and the cabin of the upper revolving structure is displaced to the left or right from the turning center of the revolving structure. In addition, the boom is erected up and down from the cabin by being displaced toward the center of the swing, and a boom hoisting cylinder is provided between the boom and the upper revolving body on the lower side of the boom when the boom is lying down. A wheel crane provided on the swing center for connecting the pipes between the lower traveling body and the upper swing body so as to freely rotate around the swing center. It is arranged offset to the side opposite to the cabin side with respect to the turning center so as not to vertically overlap with the rotary joint in the lying state.

According to the invention of claim 2, in addition to the configuration of claim 1, the boom is arranged at a position displaced in a direction in which the boom center line approaches the boom hoisting cylinder with respect to the turning center.

[Action]

By arranging the boom hoisting cylinder offset to the side of the rotary joint in this way, the problem of interference between the cylinder and the rotary joint is eliminated, so that the boom can be arranged at the lowest position.

Further, according to the configuration of claim 2, in addition to the above-described action, the boom center line can be brought closer to the boom hoisting cylinder center line, so that the eccentric load acting on these can be reduced.

〔Example〕

 An embodiment of the present invention will be described with reference to FIGS.

C is a lower traveling body, D is an upper revolving structure, 11 is a revolving bearing, 12 is a revolving frame, 1 is a cabin, 14 is a boom, 15 is a boom foot pin, and 16 is a boom hoisting cylinder arranged below the beam 14. Is. Further, 17 is a rotary joint provided on the turning center O, 17a is a slip ring of this rotary joint 17, and 17b is the same swivel joint.

The cabin 13 is attached to the turning frame 12 at a position displaced to the right with respect to the turning center O as in the conventional case.

On the other hand, the boom hoisting cylinder 16 does not overlap the slip ring 17a that protrudes toward the upper revolving structure D side of the rotary joint 17 in a plan view in the boom laid state during traveling so that the slip ring 17a does not rotate with respect to the revolving center O. In the position displaced to the left by a dimension m (shown in FIG. 3), which is slightly larger than the radius dimension of, the uppermost position is arranged.

Therefore, the boom hoisting cylinder 16 is located on the left side of the slip ring 17a in the boom hoisting state during traveling.

In other words, by offsetting the boom hoisting cylinder 16 to the left with respect to the turning center O in order to avoid the slip ring 17a, it is possible to arrange the cylinder 16 at the maximum lower position close to the upper surface of the undercarriage C. It has become possible.

Therefore, compared with the conventional crane shown in Figs.
The boom 14 can be arranged at a lower position by the amount that the boom hoisting cylinder 16 is displaced downward.

In this embodiment, in order to increase the boom lift during crane work as much as possible, the boom base end is pivotally attached to the revolving frame 12 at a position as high as possible, and the boom 14 is largely moved downward as shown while traveling. It is configured to cross the left side of the cabin at a position below the eye point P in a tilted lying state.

In this way, it is possible to obtain a high lift while ensuring the left-side field of view when traveling. Further, since the boom tip can be located lower than in the case of the conventional crane, the left front view is better than that of the conventional crane.

On the other hand, in this crane, the boom 14 is also arranged at a position displaced to the left with respect to the turning center O in accordance with the left offset of the boom hoisting cylinder 16. As a result, the boom center line 1 is brought as close as possible to the boom hoisting cylinder center line c in a plan view in the boom laid state, and the unbalanced load acting on the boom 14 and the cylinder 16 due to these gaps is made as small as possible.

Further, by offsetting the boom 14 to the left side as described above, the boom 13 is offset by the amount corresponding to the boom offset.
Can be moved to the left of the cabin of the conventional crane (inside the vehicle body). Therefore, if the cabin size is the same as that of the conventional crane, the width of the upper swing body D can be reduced by the amount of movement of the cabin, and the maximum vehicle width of the crane can be reduced. Conversely, if the vehicle width is the same as that of the conventional crane, the cabin width can be increased to improve operability and habitability. For this reason, it is very advantageous in a small wheel crane subject to vehicle width limitation.

By the way, the boom 14 may be arranged at a position where the boom center line 1 overlaps with the turning center O as in the conventional case when the vehicle width is not restricted and the countermeasure against the unbalanced load is sufficient. Further, in the above-described embodiment, the boom 14 is laid down in a state in which the boom 14 is largely inclined downward when traveling.
When the high lift is not required, the boom 14 may be configured to be laid down in a horizontal state or a state in which the boom 14 is inclined slightly downward as in the conventional case. In this case, since the pivot point of the boom base end can be set to a lower position than in the conventional case, the position of the entire boom can be lowered.

〔The invention's effect〕

As described above, according to the present invention, by arranging the boom hoisting cylinder offset to the side of the rotary joint, the problem of interference between the cylinder and the rotary joint is eliminated, so that the boom is arranged at the lowest position. It becomes possible. As a result, it is possible to improve the lateral field of view, reduce driver fatigue, and improve traveling safety.

Further, according to the invention of claim 2, in addition to the above basic effect, the boom center line can be brought close to the boom hoisting cylinder center line, so that the eccentric load acting on them can be reduced. Furthermore, because the boom is offset with respect to the turning center, the cabin can be moved to the turning center side even with the cabin of the conventional crane.
If the size of the cabin is the same as that of the conventional crane, the width of the upper swing body can be reduced by the amount of movement of the cabin. For this reason, it is very advantageous for a small crane that is limited in vehicle width.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is an enlarged front view of a section of the same portion, FIG. 4 is a side view showing a conventional example, and FIG. It is a figure. C: lower traveling structure, D: upper rotating structure, 13: cabin, 14: boom, 16: boom hoisting cylinder, 1
7 ... Rotary joint, O ... swirl center, l ... boom centerline.

Claims (2)

[Claims] 1. An upper revolving structure is mounted on a lower traveling structure, and a cabin is provided on the upper revolving structure so as to be displaced to the left or right side from a revolving center of the revolving structure. A boom is provided so as to be able to move up and down by being displaced toward the center side, and a boom hoisting cylinder is provided between the boom and the upper swing body on the lower side in the state of collapse of the boom, and a lower portion is provided on the swing center. In a wheel crane provided with a rotary joint that rotatably connects pipes around the swing center between the traveling body and the upper swing body, the boom hoisting cylinder is vertically overlapped with the rotary joint in a boom laid state. A wheel crane characterized by being arranged on the opposite side of the above-mentioned cabin side with respect to the turning center so as not to rotate. 2. The wheel crane according to claim 1, wherein the boom is arranged at a position in which a boom center line is displaced with respect to a turning center in a direction of approaching the boom hoisting cylinder.