JP4782946B2 - Vehicle-mounted crane - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle-mounted crane that can be operated in a stable posture by adjusting the angle so that it can be installed horizontally with the rear wheel of the vehicle in contact with a ground even on an inclined ground.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a vehicle-mounted crane is mounted on a chassis frame between a vehicle cab and a loading platform, that is, near a front wheel, and a crane base is fixed on the chassis frame.
When a vehicle-mounted crane is used on an inclined ground, as shown in FIG. 5, the outrigger is usually in a state where the vehicle 40 is stopped laterally (contour line direction) with respect to the inclined direction as shown in FIG. 42 is extended to the left and right, and the left and right outrigger cylinders 4344 are extended to install the crane 41 so that the base 45 is horizontal.
[0003]
Then, since the chassis frame 46 is also horizontal with the base 45 of the crane 41, both the front wheel and the rear wheel 47 on the lower side of the slope (hereinafter referred to as the valley side) are separated from the ground. Note that, in an inclined place where the inclination of the slope is not so great, the valley-side rear wheel 47 may remain in contact with the chassis frame 46 in a twisted state even if the valley-side front wheel is separated from the ground.
[0004]
[Problems to be solved by the invention]
When the front wheel and the rear wheel 47 on the valley side are both separated from the ground on the slope, only the left and right outrigger cylinders 43, 44, the front wheel (not shown) on the slope (hereinafter referred to as the mountain side), and the rear wheel 48 are grounded. Therefore, the operation of the crane 41 on the valley side is less stable than the operation on the horizontal ground, and the performance of the crane 41 is deteriorated.
[0005]
In addition, even when the valley-side rear wheel 47 is inclined so as not to leave the ground, when the chassis frame 46 is twisted, the force to return the twist works, so the crane 41 on the valley side In the work, the performance of the crane 41 is lower than that in a horizontal work. In addition, when the chassis frame 46 is twisted, the vehicle 40 itself is burdened, and the durability of the vehicle 40 is reduced.
[0006]
The present invention solves the above-mentioned problem in a vehicle-mounted crane, and can be installed horizontally with the rear wheels in contact with the ground even on sloping ground, eliminating the twist of the chassis frame and with a stable posture. It is an object of the present invention to provide a vehicle-mounted crane that can perform crane operations.
[0007]
[Means for Solving the Problems]
The vehicle-mounted crane of the present invention solves the above problems by including a crane mounting base that is attached to the vehicle so as to be tiltable, and a tilting means that adjusts an inclination angle of the crane mounting base with respect to the vehicle.
When this vehicle-mounted crane is used on an inclined ground, the base is leveled by adjusting the inclination angle of the crane mounting base with respect to the vehicle by tilting means, and in this state, the outrigger is extended to the left and right, and the outrigger cylinder is Extend the crane horizontally.
[0008]
Therefore, since the rear wheels of the mountain side and the valley side of the vehicle are kept in contact with each other even on an inclined land, it is possible to perform a stable operation with the same performance as that of a horizontal ground. Further, the chassis frame is hardly twisted, and the burden on the vehicle is reduced.
When the tilting means is provided with a mechanism that releases the holding of the tilt angle and allows the crane mounting base to freely tilt when a load of a predetermined value or more is applied, the tilting means itself can be prevented from being damaged, and the crane can be Therefore, the torsion of the chassis frame due to a large load during work can be suppressed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view of a vehicle-mounted crane according to an embodiment of the present invention, FIG. 2 is a side view of the vehicle-mounted crane, and FIG. 3 is a rear view of the vehicle-mounted crane.
In this vehicle-mounted crane 1, a base 3 having an outrigger 2 is mounted and fixed on a crane mounting base 6. A pivotable column 4 is provided on the base 3, and a telescopic boom 5 is pivotally supported at the upper end of the column 4 so as to be raised and lowered.
[0010]
A crane mounting base support bracket 7 is fixed on a chassis frame 13 between the cab 11 and the loading platform 12 of the vehicle 10, and the crane mounting base 6 is supported by the crane mounting base support bracket 7 in the longitudinal direction. 8 is pivotally supported so that it can tilt to the left and right. Further, a tilting cylinder 9 is attached between the crane mounting base support bracket 7 and the crane mounting base 6 as tilting means for adjusting the tilt angle α of the crane mounting base 6 with respect to the vehicle 10.
[0011]
This tilting cylinder 9 is a hydraulic cylinder having a mechanism that, when a load of a predetermined value or more is applied, can release the pressure in the cylinder and freely expand and contract, and does not support the load beyond that. It can prevent damage.
The outrigger 2 includes horizontal arms 21 and 22 that can be expanded and contracted in the left-right width direction of the vehicle 10 and outrigger cylinders 23 and 24 that are fixed to the ends of the horizontal arms 21 and 22 and can be expanded and contracted in the vertical direction. Grounding members 25 and 26 are attached to the lower ends of the cylinders 23 and 24.
[0012]
When the vehicle-mounted crane 1 is used on an inclined ground, after the vehicle 10 is stopped laterally with respect to the tilt direction, first, the tilt cylinder 9 is expanded and contracted to set the tilt angle α of the crane mount 6 to the vehicle 10. The base 3 is leveled by adjusting. Next, the horizontal arms 21 and 22 of the outrigger 2 are extended to the left and right while maintaining this state, and then the outrigger cylinders 23 and 24 are extended to ground the ground members 25 and 26.
[0013]
At this time, the rear wheels 14 and 15 on the valley side and the mountain side of the vehicle 10 are both grounded as shown in FIG. Therefore, the four points of the rear wheels 14 and 15 and the grounding members 25 and 26 are kept in contact with each other even on an inclined ground, and the crane 1 can perform stable work with the same performance as that of a horizontal ground.
In addition, when a load of a predetermined value or more is applied to the tilting cylinder 9 during work, the tilting cylinder 9 can be freely expanded and contracted by pressure, so that the tilting cylinder 9 itself can be prevented from being damaged, and the tilt angle Since the holding of α is released and the crane mounting base 6 can tilt freely with respect to the vehicle 10, the reaction force from the ground of the rear wheels 14 and 15 is kept almost even, and a large load is applied during work. Twisting of the chassis frame 13 due to the difference in reaction force between the rear wheels 14 and 15 when received is also suppressed.
[0014]
When the work is completed, the outrigger cylinders 23 and 24 are reduced, the horizontal arms 21 and 22 are retracted to store the outrigger 2, the tilt cylinder 9 is expanded and contracted, and the crane mounting base 6 is parallel to the vehicle 10 (α = 0) Return to the state.
As described above, the case where the vehicle-mounted crane 1 is used on an inclined ground has been described. can get.
[0015]
Even when used on a horizontal ground, if a heavy load is applied to the crane 1 during work and a load of a predetermined value or more is applied to the tilt cylinder 9, the tilt angle α (in this case α = 0) is released. Since the crane mounting base 6 can freely tilt with respect to the vehicle 10, the reaction force of the rear wheels 14, 15 from the ground can be maintained substantially evenly. Thereby, the twist of the chassis frame 13 due to the difference in reaction force between the rear wheels 14 and 15 when a large load is received during work is suppressed.
[0016]
【The invention's effect】
As described above, the vehicle-mounted crane of the present invention can be installed horizontally with the rear wheels still in contact with ground even on sloping ground. Therefore, it is possible to work with the same crane performance as the horizontal ground in a stable posture, and torsion of the vehicle can be suppressed.
[Brief description of the drawings]
FIG. 1 is a plan view of a vehicle-mounted crane according to an embodiment of the present invention.
FIG. 2 is a side view of a vehicle-mounted crane.
FIG. 3 is a rear view of a vehicle-mounted crane.
FIG. 4 is a rear view showing the posture of a conventional vehicle-mounted crane during vehicle travel.
FIG. 5 is a rear view showing a state where the conventional vehicle-mounted crane is installed on an inclined land.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crane 2 Outrigger 3 Base 4 Column 5 Boom 6 Crane mounting base 7 Crane mounting base support bracket 8 Support shaft 9 Tilt cylinder 10 Vehicle 11 Driver's cab 12 Car bed 13 Chassis frame 14 Rear wheel 15 Rear wheel 21 Horizontal arm 22 Horizontal arm 23 Outrigger Cylinder 24 Outrigger cylinder 25 Grounding member 26 Grounding member

Claims (1)

A crane mounting base support bracket fixed on a chassis frame between the cab of the vehicle and the loading platform; and a crane mounting base pivotally supported by the crane mounting base support bracket so as to be tiltable to the left and right with a support shaft in the front-rear direction. A base mounted on the crane mounting base and having a pair of outriggers, and an inclination angle of the crane mounting base with respect to the vehicle between the crane mounting base and the crane mounting base support bracket. One tilting cylinder attached as tilting means,
When a load of a predetermined value or more is applied, the one tilt cylinder releases the hold of the tilt angle in both the compression side and the tension side of the tilt cylinder, and the rear wheel of the vehicle counteracts from the ground. A vehicle-mounted crane having a mechanism that allows the crane mounting table to freely tilt so as to keep the force even .

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