JP3234088B2 - Vertical crane for mobile crane - Google Patents

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 up / down attaching / detaching device for detachably attaching or detaching an upper revolving unit and a lower traveling unit which are detachably formed.

[0002]

2. Description of the Related Art Among mobile cranes, large cranes are formed so that the upper revolving unit and the lower traveling unit can be separated because traveling on public roads is restricted. And
When transporting the crane, the upper revolving unit is detached from the lower traveling unit, and only the lower traveling unit is allowed to travel by itself. The upper revolving unit is loaded on a trailer and transported. Then, after transporting to the work site, the upper revolving superstructure is mounted on the lower traveling structure again to perform the crane operation.

As a method for attaching and detaching the upper revolving unit and the lower traveling unit, for example, as shown in FIG. 9, hydraulic jacks 2, 2, 2, 2 are fixedly provided below the upper revolving unit 1, and the hydraulic jacks are provided. 2. Description of the Related Art There is known a device formed so that an upper revolving structure 1 is raised by extending 2, 2, 2, 2. When transporting the crane, the hydraulic jacks 2, 2, 2, 2 are extended to separate the upper revolving unit 1 from the lower traveling unit (not shown), and the lower traveling unit is moved from below the upper revolving unit 1 to another location. , The trailer carrier 3 is inserted and the hydraulic jack 2,
When 2, 2, 2 is contracted, the upper swing body 1 descends and is placed on the bed 3 of the trailer.

Further, as shown in FIG. 10, a method of forming an independent attaching / detaching device called a lifter 4 and using the lifter 4 only when attaching / detaching the upper revolving unit 1 and the lower traveling unit 5 is used. Is also known. When transporting the crane, first, as shown in FIG. 10A, the lifters 4 are temporarily placed at the jack-up locations, and the supporters 6 are connected to the lower traveling body 5 to prevent the lifters 4 from falling down. . Next, FIG.
As shown in (b), the wire 7 is suspended from the lower surface of the upper swing body 1 and connected to the upper portion of the lifter 4, and the hydraulic jack 8 of the lifter 4 is once contracted to float the bottom surface of the lifter 4.
Then, when the hydraulic jack 8 is slightly extended and the bottom surface of the lifter 4 lands, the lifter 4 is positioned at the jack-up position.

Next, the hydraulic jack 8 is extended by removing the wire 7 and the upper end of the lifter 4 is brought into contact with an engaging portion 9 provided on the lower surface of the upper swing body 1 as shown in FIG. . In such a state, a pin 10 is inserted through the engagement portion 9 and the upper end of the lifter 4 to fix the lifter 4 to the lower surface of the upper swing body 1. When the hydraulic jack 8 is further extended, the upper swing body 1 rises and separates from the lower traveling body 5.

[0006]

In the conventional attachment / detachment device shown in FIG. 9, since the upper rotating body itself is provided with a hydraulic jack, the total weight of the crane increases and the installation space for the attachment / detachment device is large. Become. Therefore, it hinders reduction in size and weight of the crane. The attachment / detachment device shown in FIG.
The attaching / detaching work becomes extremely complicated, and there is a danger due to pinning work at a high place.

Therefore, when attaching and detaching the upper revolving unit and the lower traveling unit of the mobile crane, there arises a technical problem to be solved in order to facilitate the attaching / detaching operation while ensuring safety. An object of the present invention is to solve this problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and is intended to provide a vertically movable device for attaching and detaching an upper revolving unit and a lower traveling unit of a mobile crane. A convex portion is provided on the lower surface of the slide beam which can be extended and retracted, hydraulic jacks are vertically provided at both ends of the slide beam, and an engagement portion is provided on an upper portion of the slide beam to form a pin hole, and An automatic pinning device is attached to the pin hole of the section, and further, a concave portion is provided in the lower traveling body at a position corresponding to the convex portion of the slide beam, and the convex portion and the concave portion are formed to be freely engageable. An engaging portion is provided at a position corresponding to the engaging portion of the slide beam so that both of the engaging portions are freely engageable, and a pin hole is formed in the engaging portion of the upper rotating body to slide the slide beam. Shape so that it matches the pin hole of the beam engagement part. There is provided a vertical attachment apparatus of a mobile crane that.

[0009]

When the upper revolving unit of the mobile crane is to be separated from the lower traveling unit, the projection provided on the lower surface of the slide beam is engaged with the concave portion of the lower traveling unit, and the slide beam is mounted on the lower traveling unit. Place. In this state, the vertical attachment / detachment device is positioned. Then, after extending the hydraulic jack and grounding the lower end thereof, if the hydraulic jack is extended as it is, the slide beam is supported by the hydraulic jack and rises, and the engaging portion provided on the upper portion of the slide beam is provided. Engages with the engaging portion of the upper swing body.

As described above, since the upper / lower attachment / detachment device is positioned, the pin holes formed in both engagement portions exactly match. Then, the pin is inserted into the pin hole by the automatic pin driving device, and the vertical attachment / detachment device is fixed to the upper rotating body. Further, when the hydraulic jack is extended, the upper revolving unit rises and separates from the lower traveling unit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view of a mobile crane,
The upper and lower revolving units 12 and 13 are interposed before and after the upper revolving unit 11, respectively, and the upper revolving unit 11 is separated from the lower traveling unit 14 above. FIG. 2 shows a front-side vertical attachment / detachment device 12, in which hydraulic jacks 16, 16 are fixed to the left and right ends of a slide beam 15 downward. The slide beam 15 has a double tube structure, and is formed so that the slide beam 15 expands and contracts in the left-right horizontal direction by the operation of the retract cylinder 17.

Here, projections 18, 18 are provided on the lower surface of the slide beam 15, and recesses 19, 1 are provided on the upper surface of the lower traveling body 14 at positions corresponding to the projections 18, 18.
9 are provided to form the protrusions 18, 18 and the recesses 19, 19 so as to be freely engageable. Further, frames 20 and 20 are erected near the center of the slide beam 15, and engagement recesses 21 and 21 are provided on the upper portions of the respective frames 20 and 20 to drill the pin holes 22 and 22. Motorized automatic pinning devices 23, 2 are inserted into the pin holes 22, 22 of the mating recesses 21, 21, respectively.
3 is attached. The automatic pinning device 23 is formed such that the pin 24 projects into the pin hole 22 when the DC motor operates.

Further, on the lower surface of the upper revolving unit 11, engagement projections 25, 25 are provided at positions corresponding to the engagement recesses 21, 21, so that the engagement recesses 21, 21 and the engagement projections 25, 25 are provided. 25
Are formed to be freely engageable. In addition, the respective engaging projections 25, 2
5, when the engaging concave portion 21 and the engaging convex portion 25 are engaged, the two pin holes 22 and 26 are formed.
Are matched exactly. Reference numeral 27 denotes a pontoon for grounding.

Next, referring to FIG.
The procedure for detaching the undercarriage 1 from the undercarriage 14 will be described with reference to FIGS. First, as shown in FIG. 3, the crane 28 provided on the upper revolving unit 11 lifts the rear vertical attachment / detachment device 13 and places it on the lower traveling unit 14 at a predetermined position. At this time, as described above, the convex portions 18 of the slide beam 15 are
By engaging with 19, the vertical attachment / detachment device 13 is accurately positioned. In the same manner, as shown in FIG.
4 is placed at a predetermined position. The vertical attachment / detachment device 12 on the front side also
Convex portions 18, 18 of slide beam 15 and lower traveling body 14
By the engagement of the concave portions 19, 19, the vertical attachment / detachment device 12 is accurately positioned.

Then, as shown in FIGS. 5 (a) and 5 (b), by operating a remote control box 29 attached to the front / rear vertical attachment / detachment devices 12 and 13,
The left and right hydraulic jacks 16 are extended, and their lower ends are lowered to be supported by the pontoons 27, 27. When the extension of the hydraulic jacks 16 and 16 is continued, the pontoon 2
The entire vertical attachment / detachment device 12, 13 supported by 7, 27 rises, the engagement between the convex portions 18, 18 and the concave portions 19, 19 is released, and the slide beam 15 separates from the lower traveling body 14. Further, the slide beam 15 is raised and the frame 2
The engagement concave portions 21 and 21 provided on the upper portions of the upper and lower revolving bodies 11 and 25 engage with the engagement convex portions 25 and 25 of the upper rotating body 11.

Although the pin holes 22 and 26 are formed in the engaging concave portion 21 and the engaging convex portion 25, respectively, as described above, the vertical attachment / detachment devices 12 and 13 connect the convex portion 18 and the concave portion 19 with each other. Positioning by engagement, both pin holes 2
The hole positions of 2 and 26 exactly match. Therefore, when the pin 24 is protruded from the automatic pinning device 23 by operating the remote control box 29, the pin 24 is inserted into the pin holes 22 and 26, and the engaging concave portion 21 and the engaging convex portion 25 are integrated. The upper and lower attachment / detachment devices 12 and 13 are fixed to the upper swing body 11.

Further, if the hydraulic jacks 16, 16 continue to be extended, the upper revolving unit 11 is pushed up by the upper and lower attaching / detaching devices 12, 13, and the upper revolving unit 11 is moved from the lower traveling unit 14 as shown in FIG. Leaves and rises. After the lower traveling body 14 is moved to another place in such a state, the loading platform 30 of the trailer is inserted below the upper rotating body 11 as shown in FIG.

Then, when the hydraulic jacks 16, 16, 16, 16 of the front and rear upper / lower attachment / detachment devices 12, 13 are contracted and the upper rotating body 11 is lowered, as shown in FIG. It is mounted on the loading platform 30 of the trailer via the support platforms 31a, 31b, 31c and the like. Each hydraulic jack 16,
16, 16, 16 are contracted to the shortest position, and Pontoon 2
7, 27, 27, 27 are removed. The rear vertical attachment / detachment device 13 can be tilted rearward of the fuselage during storage.

Thereafter, as shown in FIG. 8, the retractable cylinders 17 of the front and rear vertical attachment / detachment devices 12 and 13 are contracted to reduce the left and right width of the slide beam 15. Further, a wire (not shown) is connected between a key point of the upper revolving unit 11 and the trailer bed 30 to connect the trailer bed 3 to the trailer bed.
If the upper swing body 11 is fixed so as not to move unexpectedly on the zero, the transport attitude of the upper swing body 11 is completed.

Thus, the upper revolving unit 11 is loaded and transported on the bed 30 of the trailer, and the lower traveling unit 14 moves by itself and moves to the destination. When changing from the transport posture to the work posture, the upper revolving superstructure 11 is mounted on the lower traveling structure 14 in a procedure reverse to that described above. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0021]

According to the present invention, as described in detail in the above-described embodiment, by engaging the convex portion of the slide beam with the concave portion provided in the lower traveling body, the vertical mounting / removing device is accurately positioned, and the upper turning member is turned. Pin holes for fixing the body and the upper / lower attachment / detachment device can be matched. Accordingly, the attaching / detaching operation is simplified, and the operation efficiency can be improved.

Further, since the insertion of the pins is performed by an automatic pinning device, manual pinning work at a high place is eliminated, and safety can be ensured. In addition, since the device is removed during crane work, the crane can be reduced in size and weight. It is an invention that can provide various effects, such as the ability to also contribute to the above.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention, in a state in which an upper revolving unit is separated from a lower traveling unit by an up / down attaching / detaching device.

FIG. 2 is a partially cutaway front view of the vertical attachment / detachment device.

FIG. 3 is a side view showing the sequence of attaching and detaching operations.

FIG. 4 is a side view showing the order of the attachment / detachment operation.

FIG. 5A is a side view showing the order of the attachment / detachment work. (B)
9 is a rear view showing the order of the attaching and detaching work.

FIG. 6 is a side view showing the order of the attachment / detachment work.

FIG. 7 is a side view showing the sequence of attaching and detaching operations.

FIG. 8 is a rear view showing the order of the attaching / detaching operation.

FIG. 9 is a side view showing an example of a conventional vertical mounting / detaching device.

FIGS. 10A, 10B, and 10C are explanatory diagrams showing another example of the conventional vertical mounting / detaching device and showing the order of the mounting / removing operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Upper revolving body 12, 13 Vertical attachment / detachment device 14 Lower traveling body 15 Slide beam 16 Hydraulic jack 17 Retract cylinder 18 Convex part 19 Recess 21 Engagement concave part 22, 26 Pin hole 23 Automatic pinning device 24 Pin 25 Engagement convex part

Claims (1)

(57) [Claims] 1. A vertically movable device for attaching and detaching an upper revolving unit and a lower traveling unit of a mobile crane, wherein a protrusion is provided on a lower surface of a horizontally expandable and contractable slide beam, and hydraulic pressure is provided at both ends of the slide beam. A jack is vertically installed, and an engagement portion is provided on the upper portion of the slide beam to open a pin hole,
An automatic pinning device is attached to the pin hole of the engaging portion, and further, the lower traveling body is provided with a concave portion at a position corresponding to the convex portion of the slide beam, and the convex portion and the concave portion are formed to be freely engageable, An engaging portion is provided on the upper revolving structure at a position corresponding to the engaging portion of the slide beam so that both engaging portions can be freely engaged, and a pin hole is formed in the engaging portion of the upper revolving structure. A movable crane vertical mounting / dismounting device formed so as to coincide with a pin hole of an engaging portion of the slide beam.