JP2589487B2 - Outrigger device for truck crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an outrigger device for a truck crane having an increased maximum lifting capacity so as to improve the efficiency of large-scale construction works such as high-rise buildings and long bridges. About.

[Conventional technology]

Conventionally, as an outrigger device for such a truck crane, a pair of left and right side outriggers mounted on the underside of the truck crane body in front of and behind the crane swivel support turntable so as to be able to extend to both sides respectively are provided with a base portion on the body. Japanese Patent Publication No. 57-38460 and Japanese Patent Application Laid-Open No. 58-214446 disclose an outrigger device in which a vertical first jack that can be lifted by a truck crane is attached to the tip of a horizontally supported telescopic beam that is fixed and supported. Is disclosed.

[Problems to be solved by the invention]

However, if the maximum lifting capacity of the truck crane is to be increased more than before, the weight of the counterweight 5 increases in response to the increase in the weight of the telescopic boom 4 and the suspended load as shown in FIG. The mounting position of the counterweight with respect to the platform 6 must be shifted as much as possible from the crane-turntable support turntable 9 on the body frame 8 to the rear of the crane-turntable within a range that does not interfere with the car cab 7. The total weight increase becomes significant.

In FIG. 5, reference numeral 10 denotes an engine room mounted at the center of the front end of the body frame 8, 11 denotes front wheels on both sides, 12 denotes rear wheels, 13 denotes a crane operation room on the crane swivel 6, and 14 denotes a crane operation room.
A base pivot pin 15 of the telescopic telescopic boom 4 composed of two boom cylinders indicates a derrick cylinder for raising and lowering the telescopic boom. A pair of left and right lateral outriggers A and B which can be extended are attached.

When a heavy lifting load is applied to the crane swivel when carrying out the side lifting work with this truck crane, the bending deflection in the vertical plane generated between the pair of left and right telescopic beams of each side outrigger A, B Due to the difference and the difference in the amount of settlement of the ground between the grounding plates of the pair of first jacks on the left and right, the truck crane may incline, thereby increasing the working radius of the crane and making it impossible to lift the load with the rated load. is there.
In order to solve this drawback, an auxiliary leg with a ground plate (float) pivotally attached to the lower end is detachably attached to the middle of the tip beam tube with low bending rigidity in the horizontal plane.
The 44254 invention is known, but this configuration not only causes the following problems but also cannot be applied when the ground height of the telescopic beam attached to the lower side of the vehicle body is low.

[Problems to be solved by the invention]

In general, in the case of a multi-stage telescopic beam, the bending rigidity of the tip beam tube in the horizontal plane is significantly reduced. Therefore, when the center of gravity of the entire truck crane moves in the longitudinal direction of the vehicle body due to elevation of the telescopic boom at a high angle, etc., While mainly bending the tip beam tube in the horizontal direction,
The truck crane oscillated in the front-rear direction, impairing the stable support of the truck crane by the outrigger device, and making the crane operator creepy.

[Means for solving the problem]

The present invention addresses this problem by providing a pair of vertical second jacks, which cooperate with each other to generate a ground lift that cannot be lifted by a truck crane, at the tip of the intermediate beam tube of each multistage telescopic beam 1, 1 '. 3, 3 'are mounted symmetrically with respect to the intermediate beam tube, and the second jack is configured to withstand a compressive load during a cargo handling operation.

[Operation] When the outrigger device is extended, the telescopic beam 1 of each side outrigger is extended in a no-load state, and then the truck crane is lifted by the first jacks attached to the ends thereof, and the body frame 8 is placed in the horizontal state. Then, when the second jacks 3 of each telescopic beam 1 are extended and their grounding plates are respectively grounded, the ground output of the two second jacks cannot lift the truck crane. Without fear of the track crane being out of order by the jack,
The track crane can be stably supported horizontally by the first and second jacks.

In this state, when performing the side hanging cargo handling work, a pair of second
Since the jack is attached to the front end of the intermediate beam tube in a symmetric arrangement in the front-rear direction, there is no possibility that the telescopic beam 1 is twisted by the ground output of the two second jacks. In addition, since the two second jacks 3 withstand the compressive load during the cargo handling operation, the difference in bending deflection generated between the pair of right and left telescopic beams 1 and 1 due to the suspended load is increased. The two second jacks 3, which are extremely large and have a small amount of settlement to the ground, prevent the truck crane from tilting due to the load of the suspended load.

Also, when the center of gravity of the entire truck crane moves in the front-rear direction of the body frame by elevating the telescopic boom near the standing state, the tip beam tube having a small bending rigidity in the horizontal plane is bent by the inertia. However, even if the truck crane attempts to float back and forth, the second side attached to the tip of the intermediate beam tube having relatively large bending rigidity in the horizontal plane
Friction between the ground plane of the jack and the ground prevents the truck crane from floating.

〔Example〕

The figure shows an embodiment of the present invention in which a pair of left and right side outriggers A and B, which are attached to the body frame 8 in front of and behind the turntable 9 so that they can be pasted on both sides, respectively, have the same configuration. The beam 1 is a multistage telescopic beam in which an intermediate beam tube 17 and a tip beam tube 18 are sequentially inserted into a base beam tube 16 having a rectangular cross section fixed to the lower surface of the body frame 8 in a telescope shape. A ground plate is attached to the lower end of a piston rod 20 (FIG. 4) of a vertical first jack (double-acting hydraulic cylinder) 19 attached to the tip via a spherical joint.
21 is detachably attached as in the prior art.

The opening / closing frame 2, which is detachably attached to the intermediate beam tube 17 so as to substantially contact with its front end flange 17a, has a rectangular seat plate 22 which can be placed on the intermediate beam tube as shown in FIG. On both sides, the upper ends of L-shaped members 23, 23 having a symmetrical configuration which can be held by the intermediate beam tube in cooperation with the seat plate are pivotally connected with pins 24, respectively. Tsuba 23 protruding on both sides
The lower ends of the cylinders of the second jacks (double-acting hydraulic cylinders) 3 are fixed symmetrically with respect to the intermediate beam cylinder 17 and the reinforcing plates 23b integrally provided before and after the two L-shaped members. A link 26 is connected between the middle portion and a portion corresponding to both ends of a rectangular suspension frame 25 which is separably mounted on the seat plate 22.

Further, in order to lock the two L-shaped members 23, 23 in the closed state shown by the solid line in FIG. 2, a lock 27 pivotally connected between the upper and lower brackets 23d at the lower end of one of the L-shaped members as shown in FIG. The rod 28 can be fixed by a pin 29 that can be inserted and removed between upper and lower brackets 23c provided at the lower end of the other L-shaped member. When the lock is released, the locking rod 28 is located between the upper and lower brackets 23d. It is stored as shown by a chain line (a) in the figure, and is fixed to the release position (a) by inserting a pin 29 into a pin hole 30 provided in the upper and lower brackets 23d.

For this reason, the lower end of the crane suspension cable 31 of the truck crane itself is detachably connected to the center of the suspension frame 25, and after the second jack 3 is contracted, the oil path connecting the second jack to the hydraulic source is separated. Then, the locking rod 28 is restrained at the release position (a),
Next, when the hoisting line 25 is lifted by the crane hoisting line, first, the L-shaped members on both sides with respect to the seat plate 22 supported on the intermediate beam tube 17.
As shown in the chain line in FIG.
If the upper end of each reinforcing plate 23b abuts and engages with the stopper portion 22a of the seat plate 22, the two L-shaped members are integrated with the seat plate 22 to form the link 26 and the suspension frame. Suspended via 25 and removed from the intermediate beam tube. The detached second open / close frame 2 with a jack is transported by another transport vehicle.

In this case, it goes without saying that the center of gravity G of the L-shaped member 23 and the second jack 3 is located closer to the intermediate beam tube than the connection center E of the link 26 to the reinforcing plate 23b. In FIG. 2, reference numeral 32 denotes a piston rod of the second jack 3, reference numeral 33 denotes a grounding plate removably attached to a lower end of the piston rod via a spherical joint, and reference numeral 34 denotes a hydraulic oil for beam expansion and contraction mounted in the multistage telescopic beam 1. Shows the cylinder, opening and closing frame 2 for the intermediate beam tube 17
When attaching / detaching, the ground plate 33 can be removed as necessary.

The embodiment in which the opening / closing frame 2 is opened downward by the lifting force of the crane and attached to and detached from the intermediate beam tube has been described above. The open ends of the U-shaped members may be detachably bolted to each other to form a rectangular frame for holding the intermediate beam tube. In this case, each of the U-shaped members is substantially vertically Is provided with a wire connecting portion to be suspended.

The track crane shown in FIG. 1 has a swing arm 36 pivotally mounted 35 on the rear end of the body frame 8 so as to always exert a constant lifting capacity regardless of the swing angle position of the crane swivel 6. A link 37 for detachably connecting the turning arm and the vehicle body frame so as to fix the turning arm to the rearwardly extended position shown in FIG. 1, and a third jack vertically attached to the tip of the turning arm 6 Rear outrigger C including 38
And a fourth jack 39 vertically attached to the center of the front end of the vehicle body frame 8.

As shown in FIG. 7, all the second jacks 3 and the third and fourth jacks 38, 39 are lifted by a truck crane via a pressure reducing valve (not shown) to the extended high pressure side oil passage 40. It is configured to supply an impossible hydraulic pressure (a few tenths to one tenth of the operating hydraulic pressure of the first jack 19), and the pilot hydraulic pressure is transmitted to the high-pressure side oil passage 40 from the other low-pressure side oil passage 41. The inserted pilot check valve 42 is inserted so that the second to fourth jacks withstand the compressive load during the cargo handling operation. Such a hydraulic circuit is disclosed in JP-B-57-38460 and JP-B-61-1.
Since it can be easily inferred from the circuit described in Japanese Patent No. 1876 or the like, it is preferable that all the second jacks 3 can be expanded and contracted at the same time, though not described in detail here.

The embodiment of the three-stage telescopic beam has been described above. However, when it is desired to further increase the amount of overhang of the side outrigger than in the embodiment of FIG. 1, the illustrated three-stage telescopic beam 1 is changed to a four-stage telescopic beam. Thus, the second open / close frame 2 with a jack can also be attached to the ends of the two intermediate beam tubes.

In the above-described embodiment, since the open / close frame 2 that supports the pair of second jacks 3 is detachably attached to the tip of the intermediate beam tube, the intermediate beam tube 17 is substantially inserted into the base beam tube 16 when the telescopic beam contracts. The side outriggers A and B on both sides can be completely housed within the vehicle width W, so that the side outriggers do not hinder the traveling of the truck crane on the road.

As shown in FIG. 6, when the length L of the lateral outrigger storage space D provided on each side of the vehicle body frame 8 'can be increased in the longitudinal direction of the vehicle, the front end of the intermediate beam tube 17' is opened and closed. It is also possible to mount the pair of second jacks 3 'straight without a frame, and store the side outriggers in the vehicle width W as shown in the left half of the figure while attaching the second jacks. . In FIG. 6, the parts with the reference numerals with a dash added to the part codes used in FIG. 1 indicate the corresponding parts.

When the truck crane of the present invention travels, the crane swivel 6 with a turntable, its counterweight 5 and the multi-stage telescopic beam 4 are respectively taken out and transported separately, so that only the automobile with the outrigger device travels on the road. .

〔The invention's effect〕

According to the present invention, the front ends of the intermediate beam cylinders, which have a short lateral overhang length and are hard to bend in the vertical direction, are supported by the pair of second jacks, respectively. Therefore, the level of the truck crane lifted when there is no load is disturbed by the suspended load during the side-loading work, and there is no danger that the working radius will fluctuate, and when the telescopic boom is raised at a high angle, etc. Due to the inertia of the center of gravity of the truck crane moving in the front-rear direction of the vehicle body, the truck crane tries to float in the front-rear direction while bending the tip beam tube having a small bending rigidity in the horizontal plane in the horizontal direction. This is prevented by the frictional resistance between the ground and the ground, so the stable support of the truck crane by the outrigger device is impaired, and there is no fear that the crane operator will be uneasy. There is an effect that can lift the over down safety suspended load of rated load full regulated by device safely and reliably.

[Brief description of the drawings]

1 is a plan view of a vehicle body frame to which an outrigger device is mounted, FIG. 2 is a vertical sectional side view of a portion where the opening and closing frame is mounted, FIG. 3 is a bottom view of the opening and closing frame, and FIG. 4 is a lateral outrigger of FIG. FIG. 5 is a side view of the truck crane, and FIG.
FIG. 6 is a plan view of a main part of another embodiment, and FIG. 7 is a piping diagram around a second jack. 4 ... Multi-stage telescopic boom, 6 ... Crane swivel, 7 ...
Car cab, 8 Body frame, 9 Turntable, 10 Engine room.

Claims (2)

(57) [Claims] 1. A pair of left and right lateral outriggers mounted on a lower side of a truck crane body in front of and behind a crane swivel support turntable so as to extend to both sides, respectively. In an outrigger device in which a vertical first jack capable of lifting a truck crane is attached to a tip of a multi-stage telescopic beam, a truck crane lifts a tip of an intermediate beam tube of each multi-stage telescopic beam (1, 1 '). A pair of vertical second jacks (3, 3 '), which cooperate to produce an impossible ground output, are mounted symmetrically with respect to the intermediate beam tube to withstand the compressive load during loading operations. An outrigger device for a truck crane, wherein the outrigger device is configured as described above. 2. An outrigger device for a truck crane as claimed in claim 1, wherein said opening and closing frames (2) are detachably attached to a front end of said intermediate beam tube so as to hold said intermediate beam tube.