JPH0683693U - Mobile crane - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a crane vehicle equipped with a crane, moved to a place where a heavy object is placed, and used for lifting and moving the heavy object. It is intended to improve the property and reduce the weight of the frame and the outrigger. [Construction] In a crane vehicle, in which jack outriggers are arranged on the front, rear, left, and right of a frame, and a revolving structure is provided on a substantially central portion of the frame, a jack is provided on a lower surface of a portion of the frame where the revolving structure is provided. Consists of

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mobile crane equipped with a crane, moved to a place where a heavy object is placed, and used for lifting and moving the heavy object.

[0002]

[Prior art]

 The load of the load is not distributed and applied to the carrier of the crane vehicle, which is equipped with a crane whose maximum weight that can be lifted is several tens to 100 tons, and the revolving structure is not applied during the work. The weight of the revolving structure and the heavy object to be lifted or moved is concentrated around the position where it is attached, and the weight acts as a response.

In such a crane vehicle, in order to obtain sufficient rigidity against bending and torsional forces due to the above-mentioned concentrated load, side rails, cross members, reinforcements, etc. are all welded, unlike ordinary trucks. A fully integrated welded structure is adopted.In addition, a front jack is provided at a position corresponding to the vicinity of the cab in the lower center of the frame in the vehicle width direction, and a rear jack is provided at the opposite vehicle rear position. Therefore, two outriggers are provided on each of the left and right side faces, sandwiching the mounting position of the revolving structure described above.

Further, such front jacks, rear jacks, and outriggers are individually provided with hydraulic cylinders that can expand and contract in the road surface direction, and at the time of work, the tips of these hydraulic cylinders are extended so as to contact the road surface. The concentrated load described above is shared, and rollover of the vehicle body due to the movement of the center of gravity according to the turning of the turning body is avoided.

As prior art relating to the structure of a crane vehicle, for example, there are those described in Japanese Utility Model Publication No. 63-96912 and Japanese Utility Model Publication No. 63-164083.

[0006]

[Problems to be solved by the device]

 By the way, in such conventional mobile cranes, the side rails and cross members that make up the frame have a U-shape and a U-shape as the maximum weight to be lifted and the weight of the crane itself are increased. (For cross members, convex shapes and Z-shapes are also used.) The complicated cross-sectional shape has been adopted, the size has increased, and the total weight of the members used has increased.

Also, regarding the outriggers, as the load shared by each outrigger increases, the thickness of the member is increased in order to obtain the strength against the load, or a complicated cross-sectional structure is adopted and used in the same manner. The total weight of the component has increased.

An object of the present invention is to improve stability during work and to reduce the weight of a frame and an outrigger.

[0009]

[Means for Solving the Problems]

 The present invention relates to a crane vehicle in which outriggers with jacks are provided on the front, rear, left and right sides of a frame, and a revolving structure is provided on a substantially central portion of the frame, and a jack is provided on a lower surface of a portion of the frame where the revolving structure is provided. Is provided.

[0010]

[Action]

 In the crane vehicle according to the present invention, since the jack is provided on the lower surface of the portion of the frame where the revolving structure is provided, the equilibrium state of the vehicle body is kept good and the stability is improved. Further, since the distortion and the twist given to the portion where the revolving structure is provided are reduced and the rigidity is enhanced, the weight of the frame and the outrigger can be reduced.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention.

In the figure, a front jack 12 is provided so as to project at a position corresponding to the vicinity of the cab in the center of the bottom surface of the frame 11 in the vehicle width direction of the mobile crane, and a rear jack 13 is provided at a position on the opposite side of the vehicle body on the rear side. Is projected. A revolving unit 14 is rotatably mounted on the upper surface of the frame 11 at a position approximately in the center between the mounting positions of the front jack 12 and the rear jack 13. A jack 15 is provided so as to protrude from the bottom surface of the frame 11 at a position corresponding to the rotation axis of the revolving structure 14. Two pairs of jacked outriggers (hereinafter, simply referred to as “outriggers”) 16 _L1 , 16 _L2 , 16 _R1 , and 16 _R2 are attached to the left and right side surfaces of the frame 11 with the revolving structure 14 being attached. Hydraulic cylinders 17 _L1 , 17 _L2 , 17 _R1 and 17 _R2 are attached to the tips of the outriggers 16 _L1 , 16 _L2 , 16 _R1 and 16 _R2 respectively so as to be extendable and contractible in the road surface direction. A counterweight 18, which balances the weight with the boom of the revolving structure, is attached to the side surface of the central portion of the revolving structure 14, which serves as a rotation axis.

The operation of this embodiment will be described below. At the time of traveling, the front jack 12, the rear jack 13 and the jack 15 are contracted to the shortest length and accommodated in the lower part of the frame 11, and the outriggers 16 _L1 , 16 _L2 , 16 _R1 and 16 _R2 are hydraulic cylinders 17 _L1 , 17 _L2 and 17 _L2 . _R1 and 17 _R2 are housed in the lower part of the frame 11 in a contracted state to the shortest length, and the arm of the rotating body 14 is fixed in a state in which the arm is rotated to a fixed position on the cab side and tilted.

When the mobile crane traveling in such a state arrives at the place where the heavy object is placed and starts the work, as shown in FIG. 2, the rear jack 13 and the outrigger housed in the lower part of the frame 11 are arranged. 16 _L1 , 16 _L2 , 16 _R1 and 16 _R2 are projected and fixed to the rear and both sides of the vehicle, respectively, and the front end portions of the front jack 12, the rear jack 13 and the jack 15 and the hydraulic cylinders 17 _L1 and 17 are fixed. _The frame 11 is set horizontally by extending the front ends of _L2 , 17 _R1 and 17 _{R2 in} the road surface direction. Furthermore, the arm length of the revolving structure 14 and the elevation angle of the revolving structure with respect to the frame 11 are set to appropriate values, and the arm is rotated to the position of the heavy object described above to move the heavy object. Lifting and moving work is performed.

In the process of such work, the load of the entire crane vehicle and the load of heavy objects suspended at the tip of the revolving structure 14 are increased by the front jack 12, the rear jack 13, the jack 15, and the outriggers 16 _L1 , 16. _Since the load is distributed to _L2 , 16 _R1 , and 16 _R2 , the number of columns supporting such a load is increased as compared with the conventional example without the jack 15, and the revolving structure 14 to which the load is most applied is increased. Since the jack 15 is provided on the lower side of the vehicle, the stability of the vehicle body is increased. Therefore, the load of heavy objects is increased, or the angle of the revolving structure 14 with respect to the frame 11 is decreased, and a large load is applied to the frame 11. Or, even if the revolving speed of the revolving structure is increased, the mechanical equilibrium state is maintained favorably and the stability is improved.

Further, in the mobile crane according to the present embodiment, the jack 15 is attached to a substantially central portion of the area of the frame 11 sandwiched between the attachment positions of the outriggers 16 _L1 , 16 _L2 , 16 _R1 and 16 _R2. Since the bending and twisting forces acting on that region are reduced as compared with the conventional example, the rigidity required for the frame 11 is reduced. Also, since the load imposed on the front jack 12, the rear jack 13, the outriggers 16 _L1 , 16 _L2 , 16 _R1 , 16 _R2, etc. is reduced by the amount shared by the jack 15, the rigidity required for these parts is reduced. Is similarly mitigated. Therefore, it is possible to simplify the thickness and the structure of the members forming the frame 11, the outriggers 16 _L1 , 16 _L2 , 16 _R1 , 16 _{R2 and} others, and to reduce the weight.

[0017]

[Effect of device]

 As described above, in the present invention, by equipping the lower surface of the frame where the revolving structure is provided with the jack, the equilibrium state of the vehicle body is enhanced, and the revolving structure and the lifting / moving work are targeted. The rigidity and rigidity of the frame are reduced by reducing the distortion and twist imposed on the frame by the load of heavy objects.

Therefore, the stability of the work described above is improved, and the weight of the frame and the outrigger can be reduced. In the mobile crane to which the present invention is applied, the work safety is improved, and the costs related to manufacturing and operation are increased. Can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a side view of the present embodiment.

[Explanation of symbols]

 11 frame 12 front jack 13 rear jack 14 revolving structure 15 jack 16 outrigger with jack 17 hydraulic cylinder 18 counterweight

Claims (1)

[Scope of utility model registration request] 1. A crane vehicle in which outriggers with jacks are provided on the front, rear, left and right of a frame, and a revolving structure is provided on a substantially central portion of the frame, and a jack is provided on a lower surface of a portion of the frame where the revolving structure is provided. A crane truck characterized by having a.