JPH10236779A - Wheel crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the upper face position of a boom so as to reduce the fitting height of a cabin by arranging a boom derricking cylinder so as not to be positioned on the underside of a boom, and positioning downward the boom height in the condition of falling the boom forward by the nearly outer diameter of a boom derricking cylinder. SOLUTION: The upper part construction of this wheel crane is constituted above a turning bearing 81 provided on a lower part frame 50, and by arranging a cabin 90 on a turning frame 85. The base end part of a boom 75 is pivotally supported between right and left a pair of boom supporting brackets 87 through a fulcrum shaft 78. In this case, the base end part of a boom derricking cylinder 65 is pivotally fitted to the lower front end part of the boom supporting bracket 87 through a lower fulcrum shaft 67, and the extreme end part is pivotally fitted to the back side of the boom 75 through an upper fulcrum shaft 66, and the cylinder 65 is arranged so that the fitting posture is inclined rear following to go to the extreme end part. Hereby, the boom height is lowered, and the field of view for the cabin 90 is effectively insured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper structure of a wheel crane such as a rough terrain crane which turns while supporting a boom so that the boom can be raised and lowered.

[0002]

2. Description of the Related Art FIG. 8 shows an example of an upper structure of a conventional wheel crane. In recent years, in a wheel crane such as a raphtalane crane, in order to improve the visibility of the boom side during traveling, the rear surface 71 of the boom 70 during traveling is lower than the eye point 94 of the operator 93 of the cabin 90 as shown in FIG. Many are configured to fall down so as to secure forward and side views over the back of the boom 71.

[0003] The upper structure includes a slewing bearing 8 installed on a lower frame 50 included in a lower traveling body (not shown).
1 to above. A turning frame 80 has a base plate 82 below the turning frame. The base plate 82 is connected to the turning bearing 81 by a number of bolts (not shown), and is turned by a turning motor (not shown). ing. A boom 70 has a base end pivotally supported by a fulcrum shaft 73 between a pair of left and right boom support brackets 83 of the turning frame 80. One or two boom hoist cylinders 6 are provided between the lower surface 72 of the boom 70 and the base plate 82.
0 is arranged. The cylinder-side end of the boom hoist cylinder 60 is pivotally supported by a pivot frame 80 by a fulcrum shaft 62, and the rod-side end is pivotally connected to the boom 70 by a fulcrum shaft 61. Reference numeral 90 denotes a cabin, and a boom 70
The seat 92 is attached to one of the right and left sides of the vehicle. Boom 70 of cabin 90
A window 91 is provided on the side surface.

[0004]

The upper structure of the wheel crane has the following problems to be solved.

[0005] The height dimension H1 of the eye point 94 from the boom upper surface 71 needs to be a predetermined height for securing the intended front and side views, and the box section height H2 of the boom 70 is also required. Predetermined dimensions are required in view of the strength and rigidity of the boom. In the conventional upper structure, the boom lower surface 7 is arranged between the lower surface 72 of the boom and the base plate 82 to dispose the cylinder 60 for raising and lowering the boom.
The height H3 dimension between the lower frame 2 and the lower frame upper surface 51 was large. Therefore, the height H4 of the eye point 94 from the lower frame upper surface 51 is large.

The above description is based on the assumption that the boom 70 and the cabin 90
The height of the wheel crane was higher, indicating that the height of the wheel crane was higher and the center of gravity of the entire wheel crane was higher.

Therefore, running stability during running is impaired, and rolling during cornering is large, or
This leads to a phenomenon such as a large nose dive at the time of sudden braking, which causes a deterioration in riding comfort when driving. Also, since the eye point 94 is higher than the ground (not shown),
The operator feels the above phenomenon more strongly, which causes fatigue.

The present invention has been made in view of the above circumstances, and has as its object to provide an upper structure of a wheel crane which can solve the above-mentioned problems.

[0009]

SUMMARY OF THE INVENTION
In order to achieve the above object, the system is provided with the following problem solving means.

That is, according to the first aspect of the present invention, a boom fulcrum shaft is provided between a pair of left and right boom support brackets disposed on the revolving frame on a revolving frame mounted horizontally on a lower traveling body. A boom pivotably supported via a boom and a cabin which is located on one side of the boom and is used as a cockpit for both crane operation and traveling, and the boom is in its maximum upright state In a wheel crane configured to cross the outer surface of the other side of the cabin at a position lower than an eye point in the cabin, a pair of boom hoisting driving devices for driving the boom up and down are arranged on both sides of the boom. A pair of left and right boom support brackets via a lower fulcrum shaft at the base end of the boom hoist cylinder. And the front end of each boom hoist cylinder is pivotally connected to the back side of the boom via an upper fulcrum shaft, and is inclined upward and rearward toward the front end. At the same time, the cabin has a concave portion formed by recessing a rearward portion of the boom side surface thereof, and a boom hoist cylinder located on one side of the boom among the pair of left and right boom hoist cylinders is located in the concave portion. And attached to the revolving frame.

According to the second aspect of the present invention, the pair of left and right boom support brackets of the revolving frame further include rearwardly inclined front edges that are inclined upward and rearward as going upward. The undulating cylinders are arranged so as to be located above the respective rearwardly inclined front edges of the corresponding boom support brackets.

In the invention according to claim 3, the boom fulcrum shaft, the lower fulcrum shaft, and the upper fulcrum shaft are arranged such that the rearward inclination angle of the pair of left and right boom up / down cylinders in the maximum boom state and the maximum upright state is: Positions are set so that they are almost the same.

By adopting the above configuration,
Since the boom raising / lowering cylinder is not located on the lower surface of the boom, the boom height in a running state in which the boom has fallen forward can be positioned below the outer diameter of the boom raising / lowering cylinder. As a result, the position of the upper surface of the boom is lowered, so that the cabin mounting height can be reduced while securing the same front and side views as in the related art. Thus, in the upper structure of the wheel crane, the mounting height of the boom and the mounting height of the cabin can be reduced. Also, the cabin has a concave portion formed by recessing a rearward portion on the boom side surface, and a boom hoist cylinder located on one side of the boom among a pair of left and right boom hoist cylinders is located in the concave portion. Since the vehicle is mounted on the revolving frame, the up-and-down cylinder can be arranged without changing the width of the vehicle.

Here, in the upper structure according to the second aspect, the pair of left and right boom support brackets of the revolving frame of the revolving base are provided with rearwardly inclined front end edges that are inclined rearward as going upward, and the pair of left and right boom undulations. Since the cylinders are arranged so as to be located on the front side of the rearward inclined front edge of the corresponding boom support bracket, the strength of the turning frame,
Two boom hoist cylinders can be arranged while maintaining the same rigidity as the conventional one.

Further, in the upper structure according to the third aspect, the boom fulcrum shaft, the lower fulcrum shaft, and the upper fulcrum shaft are rearwardly inclined angles of the pair of left and right boom raising and lowering cylinders in the maximum falling state and the maximum raising state of the boom. However, since the position is set to be substantially the same, the swing angle of the boom raising and lowering cylinder in all the steps of the boom raising and lowering operation is minimized, and the size of the concave portion of the cabin cut out to avoid the boom raising and lowering cylinder is set. That can be minimized.

[0016]

1 and 2 show an upper structure of a wheel crane according to an embodiment of the present invention. This upper structure includes a lower frame 5 included in an unillustrated lower traveling body.
0 and above the slewing bearing 81 installed above. A turning frame 85 has a base plate 86 below the turning frame. The base plate 86 is connected to the turning bearing 81 by a number of bolts (not shown), and is turned by a turning motor (not shown). ing. A boom 75 has its base end pivotally supported between a pair of left and right boom support brackets 87 of the revolving frame 85 via a boom fulcrum shaft 78.

A boom raising / lowering cylinder 65 has its base end pivotally connected to the lower front ends of the pair of left and right boom support brackets 87 via a lower fulcrum shaft 67, and its distal end to an upper fulcrum shaft 66. And is pivotally connected to the rear side 76 of the boom 75. The mounting posture of the boom raising / lowering cylinder 65 is inclined rearward as it approaches the tip. A pair of left and right boom hoist cylinders 65 are arranged on both sides of the boom 75. Reference numeral 90 denotes a cabin, which is arranged on one side of the right or left side of the boom 75, and in which a seat 92 is attached.
A window 91 is provided on a surface of the cabin 90 on the boom 75 side.

As shown in FIGS. 3 and 4, a recess 95 is formed in the cabin 90 by recessing a portion closer to the rear of the side surface of the boom 75. As shown in FIG. 3, the concave portion 95 is provided in a triangular shape from the rear and lower surface of the cabin 90. The dimension of the recess in the vehicle width direction is WO shown in FIG. As shown in FIG. 3 and FIG.
The recess 95 is located rearward and downward with respect to the seat 92 installed inside the cabin 2, so that the livability of the cabin 90 is hardly affected by the provision of the recess 95. Most of the operating devices (not shown) installed inside the cabin 90 are usually installed in front of the seat 92, and the layout restriction is also caused by the provision of the concave portion 95. Not.

As shown in FIG. 2, a pair of left and right boom hoist cylinders 65 are provided in a concave portion 95 provided in a cabin 90.
Of the boom 75 is attached to the revolving frame 85 such that the boom hoist cylinder 65 located on one side of the boom 75 is located. For this reason, since the boom hoist cylinder 65 is accommodated in a recess having substantially the same outer diameter dimension D, the proximal end 68 of the boom hoist cylinder 65 is hidden by the cabin 90, and only the distal end 69 is the cabin 90. It protrudes from the rear.

The configuration of the invention according to claim 1 has been described above, and its operation will be described below.

The height dimension H5 of the boom lower surface 77 from the lower frame upper surface 51 shown in FIG. 1 is different from the height dimension H3 shown in FIG.
Is smaller by about the same dimension as the outer diameter dimension D of the first. That is, the boom 75 can be positioned in a running state at a position substantially lower than the outer diameter dimension D of the boom hoist cylinder by a distance lower than that of the conventional boom 70 having the upper structure. Generally, the weight of the boom occupying about 20% of the total weight of a wheel crane such as a raft lane crane is about 20%, and the center of gravity of the boom is reduced by the above-mentioned size, and the effect of lowering the center of gravity of the entire vehicle is great.

Further, since the sectional height H2 of the boom 75 and the height H1 of the eye point 94 of the operator 93 from the upper surface 76 of the boom are the same as in the prior art, the height of the eye point 94 of the operator 93 from the upper surface 51 of the lower frame is increased. H6
Also, the outer diameter D of the boom hoist cylinder 60 is smaller than the conventional dimension H4 by almost the same dimension. This lowers the height of the viewpoint of the traveling operator 93 from the ground, and has the effect of increasing the psychological security of the operator. At the same time, the mounting height of the cabin 90 is also reduced, so that the effect of lowering the center of gravity of the cabin 90 is also added.

Further, the hall crane according to the invention of the present application has an effect of lowering the overall height since the overall height is determined by the height of the cabin 90.

The operation in the vehicle width dimension will be described with reference to FIG. For wheel cranes such as raphtalane cranes,
It is desired that the overall width W of the vehicle be as small as possible to ensure ease of driving or to enter a narrow place. On the other hand, the width WC of the cabin 90 and the width W of the boom 75
B and the width dimension 88 of the winch WW require a predetermined dimension. At this time, there is a relation of W ≒ WC + WB + WW, and the entire width W is increased by the outer diameter D of the boom hoisting cylinder 65 if the boom hoisting cylinder 65 of the upper structure of the present application is left as it is. However, according to the first aspect of the present invention, the provision of the concave portion 95 in the cabin 90 enables the layout of the cabin 90, the boom 75, and the winch 88 without changing the overall width W of the vehicle.

FIGS. 5 and 6 show the superstructure according to the second embodiment.
As shown in the figure, the pair of left and right boom support brackets 87 of the revolving frame 85 includes a rearwardly inclined front end edge 89 which is inclined backward as it goes upward, and the pair of left and right boom up / down cylinders 65 respectively support the corresponding boom support. The bracket 87 is disposed so as to be located on the front side of the rearward inclined front edge 89. The base end of the boom hoist cylinder 65 is pivotally connected to lower front ends of the pair of left and right boom support brackets 87 via a lower fulcrum shaft 67. Then, in the fully reduced state, as shown in FIG.
It is substantially parallel to the rearwardly inclined front edge 89.

As described above, since the boom raising / lowering cylinder 65 and the rearwardly inclined front end 89 are formed without creating useless space, the revolving frame 85 changes its shape under the influence of the arrangement of the boom raising / lowering cylinder 65 according to the prior art. Without changing, sufficient strength and rigidity can be secured.

As shown in FIG. 7, the boom fulcrum shaft 78 of the boom 75, the lower fulcrum shaft 67 of the pair of left and right boom up-and-down cylinders 65, and the upper fulcrum shaft 66 are connected to each other. The rearward tilt angle θ of the boom raising / lowering cylinder 65 in the maximum falling state and the maximum raising state
1 are set to be substantially the same.

In this case, the swing angle θ2 in the entire operation range of the boom hoist cylinder 65 is minimized, and the size of the concave portion 95 of the cabin 90 determined by the boom hoist cylinder 65a when the maximum swing angle θ2 is reached is minimized. You can do it. At that time, the inclination angle θ3 of the line 96 of the concave portion 95 of the cabin is the smallest.
Thus, the interior volume of the cabin 90 that is reduced by providing the recess 95 can be minimized.

In the above embodiment, a wheel crane such as a raft lane crane has been described as an example. However, a mobile crane such as an alternane crane having a similar upper structure can be used.

[0030]

As described above, in order to improve the visibility of the boom side during traveling, the boom is lowered so that the back surface of the boom is lower than the eye point of the operator of the cabin. In a wheel crane such as a raft lane crane that is configured to secure forward and side views over the back, it is possible to reduce the height of the boom and cabin with respect to the lower traveling body, and reduce the overall height of the wheel crane and Therefore, the center of gravity of the entire wheel crane can be lowered.

Therefore, running stability during running is enhanced,
Rolling during cornering and nose dive during sudden braking can be suppressed, which improves ride comfort. In addition, since the height of the operator's eye point from the ground is reduced, the operator can drive with confidence while traveling, and is less likely to be tired even when driving for a long time. Further, since the height from the ground to the cabin is reduced, getting on and off the cabin is facilitated, and workability is improved.

[Brief description of the drawings]

FIG. 1 is a front view for explaining an upper structure of a wheel crane such as a raft lane crane according to the invention of claim 1 of the present application.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a front view of the cabin as viewed from BB in FIG. 2;

FIG. 4 is a cross-sectional view of the cabin as viewed from CC in FIG. 3;

FIG. 5 is a front view illustrating a turning frame and a boom hoist cylinder of a wheel crane such as a raft lane crane according to the invention of claim 2 of the present application.

FIG. 6 is a view as viewed in the direction of arrow D in FIG. 5;

FIG. 7 is a front view illustrating the operation of a boom hoist cylinder of a wheel crane such as a raft lane crane according to the invention of claim 3 of the present application.

FIG. 8 is a front view illustrating an upper structure of a conventional wheel crane such as a raphtalane crane.

[Explanation of symbols]

50 lower frame, 51 lower frame upper surface, 60 and 65 boom undulating cylinder, 61 62 fulcrum shaft, 66
Upper fulcrum axis, 67 Lower fulcrum axis, 70 75 boom,
71 76 Boom upper surface, 72 77 Boom lower surface, 7
3 78 boom fulcrum axis, 80 85 swivel frame,
81 slewing bearing, 82 86 base plate, 8
7 Boom support bracket, 88 winch, 89 forward leaning front edge, 90 cabin, 91 window, 92 seat,
93 operator, 94 eye point, 95 recess,
96 Concave Line

Claims (3)

[Claims] 1. A swing frame mounted on a lower traveling body so as to be horizontally swingable, a base end portion of a pair of left and right boom support brackets disposed on the swing frame being pivotable via a boom fulcrum shaft. A supported boom and a cabin which is located on one side of the boom and is used as a cockpit for both crane work and traveling, and the boom is in its maximum lying state and has an eye point in the cabin. A wheel crane configured to cross the outer surface of the other side of the cabin at a position lower than the above, wherein a boom hoisting drive device for driving the boom up and down is configured by a pair of boom hoisting cylinders arranged on both sides of the boom. The base end of the boom hoist cylinder is pivotally connected to the lower front ends of the pair of left and right boom support brackets via a lower fulcrum shaft. The tip end of each boom hoist cylinder is pivotally connected to the back side of the boom via an upper fulcrum shaft, and is configured to incline rearward and upward toward the tip end, and the cabin has a boom side surface. And a concave portion is formed by recessing a rearward portion of the boom hoisting cylinder positioned on one side of the boom among the pair of left and right boom hoisting cylinders in the concave portion. And wheel crane. 2. The pair of left and right boom support brackets of the revolving frame includes a rearwardly inclined front end edge that is inclined upward and rearward as it goes upward, and the pair of left and right boom up / down cylinders respectively correspond to the corresponding boom support. The wheel crane according to claim 1, wherein the wheel crane is disposed so as to be located above the rearwardly inclined front edge of the bracket. 3. The boom fulcrum shaft, the lower fulcrum shaft, and the upper fulcrum shaft are adjusted so that the rearward inclination angles of the pair of left and right boom hoist cylinders in the maximum tilting state and the maximum raising state of the boom are substantially the same. The wheel crane according to claim 1 or 2, wherein the position is set.