JPS5819599B2 - Counterweight attachment/detachment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a traveling vehicle body, a main body rotatably supported by the traveling vehicle body, a counterweight attached to the main body,
The present invention relates to a device having a gantry and a winch, such as a counterweight attachment/detachment device for a mobile crane.

FIG. 1 is a side view of a conventional truck crane.

In the figure, 1 is a traveling vehicle body, 2 is a crane body rotatably supported by the traveling vehicle body, 3 is a boom attached to the crane body 2, and 4a and 4b are bolts 5a and sb to the crane body 2 to indicate the center of rotation of the main body 2. Counterweights are mounted on top of each other in a direction perpendicular to the line, 6 is a can l-IJ front leg whose one end is rotatably attached to the crane body 2, 16 is an extendable gantry rear leg, 8 is a crane body 2
This is a hoisting winch installed on the.

The counterweights 4a and 4b are attached to increase the stability of the truck crane during operation, but when driving on the road, the counterweights 4a and 4b must be removed due to weight restrictions or steering performance reasons. , may be sent separately to the work site.

In such a case, counterweight 4 a t4
b from the crane main body 2, there are methods such as lifting the counterweights 4a and 4b using a conventional crane, using the elevating force of the boom 3, and using a removal jack.

However, there is a problem in that using other cranes requires a lot of time and money.

Further, when the elevating force of the boom 3 is used, there are problems in that it is not possible to take a large stroke for raising and lowering the counterweights 4a and 4b, and it takes time and effort to set up the counterweights.

Furthermore, when a removal jack is used, there are problems in that a large stroke cannot be achieved and many parts are required.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a low-cost counterweight attachment/detachment device that can quickly attach and detach the counterweight using a device having a counterweight or a self-blade. shall be.

FIG. 2 is a rear view of the counterweight attachment/detachment device according to the present invention, showing a state where the crane main body 2 has been turned 900 times from the state shown in FIG. 1.

In the figure, reference numeral 7 denotes a hydraulic cylinder rotatably attached to the crane body 2, and the rod tip of the hydraulic cylinder 7 is connected to the gantry front leg 6 with a pin.

9 is a kite sheave supported by the crane body 2; 10 is a sheave supported by the gantry front leg 6; the wire rope 11 of the winch 8 is hung on the kite sheave 9 and the sheave 10.

Further, 12 is a kite sheave supported by the boom 3;
is a weight lifting sheave supported by the boom 3.

In order to remove the counterweights 4a and 4b in the counterweight removal/removal device having the above configuration, first
Rotate the crane body 2 by 90 degrees from the state shown in the figure.

Next, the cylinder 7 is actuated to rotate the gantry front leg 6 so that the tip of the rope 11 is positioned directly above the counterweight 4a.

Next, a hanging tool (not shown) provided at the tip of the rope 11 and a hanging tool provided on the counterweight 4a are connected, and after operating the winch 8 to hold the counterweight 4a, the bolt 5a is tightened. Pull it out.

Next, the winch 8 is operated to lower the counterweight 4a to the ground.

Next, the cylinder 7 is actuated to rotate the gantry front leg 6 to the position shown in FIG. 3, so that the tip of the rope 11 is positioned directly above the counterweight 4b.

Next, after the hanging tool of the rope 11 and the hanging tool of the counterweight 4b are connected to hold the counterweight 4b, the bolt 5b is removed.

Furthermore, the winch 8 is operated to lower the counterweight 4b to the ground.

Further, the rope 11 is removed from the kite sheave 9 and the sheave 10 and hung on the kite sheave 12 and the lifting sheave 13, and the crane main body 2 is rotated 180 degrees.

In this state, the lifting tool of the rope 11 and the lifting tool of the counterweight 4a are connected, and the winch 8 is operated to lift the counterweight 4a.

Next, the crane main body 2 is rotated 180° while the counterweight 4a is lifted to the state shown in FIG. 4.

Furthermore, the winch 8 is activated to counterweight-4a.
is lowered onto the loading platform of the transport vehicle 14.

The counterweight 4b can also be carried onto the loading platform of the carrier vehicle 14 by performing a similar operation.

In addition, a counterweight 4 a t4 is attached to the crane body 2.
When installing b, it is sufficient to perform the operation opposite to when removing it.

In the above-mentioned embodiments, the counterweight attachment/detachment device for a truck crane was explained, but it goes without saying that the present invention can also be applied to a counterweight attachment/detachment device for mobile cranes such as crawler cranes, pile drivers, etc. .

In addition, in the above embodiment, the sheave 10 is a gun) I
Although it is supported on the J front leg 6, it goes without saying that it may be supported on the gantry rear leg, the top of the IJ, etc.

As explained above, in the counterweight attachment/detachment device according to the present invention, the device having the counterweight can quickly attach/detach the counterweight with its own blade, and the cost is low because the number of special parts is small.

Further, since the counterweight is suspended by a winch after positioning the sheave using a hydraulic cylinder, the counterweight does not shake, and the work of attaching and detaching the counterweight can be carried out safely and reliably.

As described above, the effects of this invention are remarkable.

[Brief explanation of drawings]

Fig. 1 is a side view showing a conventional truck crane, Fig. 2 is a rear view showing a counterweight removal device according to the present invention, and Figs. 3 and 4 are explanatory diagrams of the operation of the counterweight removal device according to the present invention. It is. 1... Traveling vehicle body, 2... Crane body, 3... Boom, 4a, 4b...
Counterweight, 6... Gantry front leg, 7.
...Hydraulic cylinder, 8...Winch, 1
0... Sheave, 11... Rope, 13
...Sheeb.

Claims (1)

[Claims] 1. A traveling vehicle body, a main body rotatably supported by the traveling vehicle body, a plurality of counterweights attached to the main body overlapping each other in a direction perpendicular to the turning center line, and a counterweight centered on an axis substantially horizontal to the main body. A device for attaching and detaching the counterweight of a device having a gantry rotatably attached as a gantry, and a winch attached to the main body, a hydraulic cylinder for rotating the gantry, supported by the gantry, a sheave on which the rope of the winch is hung; the gantry is rotated by the hydraulic cylinder to position the tip of the rope directly above the counterweight, and the counterweight is suspended by the winch. Features a counterweight attachment/detachment device.