JPS6111192Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a crane boom removal device.

As mobile cranes become larger, they also become heavier, and from the perspective of protecting road shoulders, bridges, etc., these heavy, large mobile cranes have to be transported from work sites to other work sites via public roads. When moving the boom and swivel to the next location, it is necessary to transport the boom and swivel separately using separate transport vehicles.

In order to transfer the boom in parts, the boom is removed from the swivel platform, but the conventional method for removing the boom has been to suspend the boom using another mobile crane. Ta. However, this method had the disadvantage of requiring another mobile crane. Therefore, a method described in Japanese Utility Model Publication No. 13319/1983 is known as a means for solving this drawback and detaching the boom from the swivel stand by oneself. In this method, the boom is swung by a luffing cylinder that is moved via a push-out cylinder installed on the swivel base, and has advantages over other methods that require a mobile crane. There was a drawback in that the extrusion cylinder was separately required.

The object of this invention is to obtain a new boom removal device for a crane that uses a boom hoisting cylinder provided in the crane and can be removed from a swivel base, thereby eliminating the need for the pushing cylinder. shall be.

Next, the present invention will be explained in detail based on a specific example.

In FIG. 1, 1 is a truck, and 2 is a swivel table which is detachably attached to the truck 1 and is rotatably mounted thereon. The rotating table 2 is equipped with an engine that is a driving source for various actuators. Reference numeral 3 denotes a boom whose base end is pivotally supported at a proper position on the swivel base 2 via a base pin 4. The boom 3 has a plurality of boom tubes that are driven to expand and contract by a hydraulic cylinder (not shown).
Reference numeral 5 designates a pair of undulation cylinders arranged between the boom 3 and the swivel base 2 so as to generate a force that pushes the boom 3 forward when the cylinder is extended. Reference numeral 6 denotes a lift device installed at the rear of the bogie 1 on the opposite side from the driver's cab 7. The lift device 6 moves up and down with the telescoping cylinder 8 and the telescoping movement of the telescoping cylinder 8, and comes into contact with the lower surface of the boom 3 and lifts the boom 3. It consists of rolling elements 9 that roll as they slide. 10
is a stay that supports the telescopic cylinder 8. 11 is a connecting pin 12 provided on the boom 3
and the undulation cylinder 5 are connected to the undulation cylinder 5.
It is a telescopic cylinder that supports the undulating cylinder 5 after it is removed by removing the half-split type presser metal fitting 5' and the connection with the boom 3 is severed, and a rolling element 13 is disposed at the tip thereof. 14 is this telescopic cylinder 1
1, and supports the center of a member 11' that connects the left and right telescopic cylinders 11 to each other. and the telescopic cylinder 1
1. The rolling elements 13 and the stay 14 also form a support device as described in the claims of the utility model registration, and this support device supports the luffing cylinder 5 that pushes forward the boom 3 which has been removed from the swivel base 2. It is supported at a constant elevation angle. In the case of this embodiment, the positions of the telescopic cylinders 8 and 11 are
As shown above, the telescopic cylinder 1 is shifted in the front and back direction.
1 may be moved so that both telescopic cylinders are juxtaposed, and in this case, it goes without saying that the stay 14 can be removed. 15 has a rolling element 15' at the lower end.
It is a boom support body having a boom 3, which is disposed at an appropriate position at the tip of the boom 3, and supports the boom 3 when the boom 3 is separated from the swivel base 2 by bringing the rolling elements 15' into contact with the carrier vehicle 16. It is something. Note that this boom support 15, when not in use,
It can be folded and stored on the underside of the boom 3,
It may be removed from the boom 3.

Next, the action will be explained.

First, as shown in FIG. 1, the rear of the carrier 16 is brought close to the rear of the trolley 1 with the rear of the carrier 16 facing the same direction, and then the swivel base 2 is swiveled to remove the boom 3.
set so that it faces the same direction as the transport vehicle 16. Next, the telescopic cylinders 8 and 11 are raised up using the stays 10 and 14. Next, the boom 3 is lowered to the front of the maximum contraction of the luffing cylinder 5, and the rolling elements 15' are brought into contact with the loading platform of the carrier vehicle 16, and the telescopic cylinder 8 is extended, so that the rolling elements 9 are lowered into the boom 3.
make contact with the bottom surface of the Next, the telescopic cylinder 11 is extended to bring the rolling elements 13 into contact with the lower surface of the undulating cylinder 5. Next, remove the half-split presser metal fitting 5',
The undulation cylinder 5 is minimized. In this state, the boom 3 is supported by the boom support 15 and the lift device 6. Next, the telescopic cylinder 11 is contracted to support the undulating cylinder 5 in a horizontal state, while
Remove the base pin 4 and disconnect the swivel base 2 and boom 3. Next, a push-out fitting 17 is attached to the boom 3 to push the boom 3 forward onto the carrier vehicle 16 using the extension force of the undulation cylinder 5. At this time, if there is a limit to the extension stroke of the undulating cylinder 5, the mounting position of the push-out fitting 17 may be changed each time. When the boom 3 moves to the appropriate position on the carrier 16, the engagement between the undulation cylinder 5 and the push-out fitting 17 is disengaged, and the telescopic cylinder 8 of the lift device 6 is retracted.
The boom 3 may be fixed by lowering the rear position of the boom 3 and placing the boom 3 on the support body 18 provided on the carrier vehicle 16.

In summary, the present invention provides a crane in which a swivel base is mounted on a trolley, and the base end of a boom is pivotally supported on the swivel base via a detachable root pin, in which the boom extends between the boom and the swivel base. A luffing cylinder is arranged so that a force is generated to push the boom forward when the boom is lowered and the base pin is removed. Since the structure is equipped with a support device that supports the boom at a constant elevation angle, when the boom is removed from the swivel base, the hoisting cylinder that raises and lowers the boom is supported at a constant elevation angle via the support device. By extending the cylinder, the boom with the base pin removed can be removed from the swivel base, and the boom can also be removed from the swivel base using the luffing cylinder to control the boom during crane work. Since it can be done by oneself, its practical effects are great.

[Brief explanation of the drawing]

Fig. 1 shows one embodiment of the present invention, and is a side view of the transport vehicle approaching the rear of the crane, Fig. 2 is a view taken in the direction of arrow H in Fig. 1, and Fig. 3 is a side view of the crane. FIG. 3 is a side view showing how the boom removed from the vehicle is placed on the carrier. 1: Dolly, 2: Swivel base, 4: Root pin, 5: Lifting cylinder.

Claims (1)

[Scope of Claim for Utility Model Registration] A crane in which a swivel base is mounted on a truck, and the base end of a boom is pivotally supported on the swivel base via a detachable base pin, wherein a A luffing cylinder is arranged so as to generate a force that pushes the boom forward when it is extended, and when the boom is lowered and the base pin is removed, the boom is removed from the revolving base as the hoisting cylinder is extended. A boom removal device for a crane, characterized in that a support device is provided to support a cylinder at a constant elevation angle.