JPS6116308Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a counterweight attachment/detachment device that allows a counterweight to be attached and detached easily and quickly.

When transporting a crane, for example a crawler crane, from one work site to another, the counterweight must be removed from the swivel frame due to road weight restrictions, and for this purpose usually another crane is transported. A crane was prepared and the counterweight was attached and detached using this crane. However, this method of attaching and detaching the counterweight does not allow easy work and requires an extra crane, resulting in high equipment costs and high operating and maintenance costs.

The present invention was made with the aim of eliminating the above-mentioned drawbacks of the conventional means, and includes a top part of a collapsible frame having a rope sheave at the top part for guiding a wire rope for hoisting a boom.
It is characterized by a link for hanging a counterweight that is pivotally attached to the counterweight, which can swing back and forth using a hydraulic cylinder.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 is an overall view of the crawler crane.
2 is a rotating frame, 2 is a boom, 3 is a frame capable of swinging back and forth around a fulcrum 4, 5
is a frame whose upper end is pivotally connected to the frame 4 and the lower end is pivotally connected to the bracket 6 so that the length can be changed when the frame 3 rotates; 7 is a boom limit stop for preventing the boom 2 from swinging; 8 is a wire A main drum that hoists and lowers a hook 10 suspended from a rope 9; 11 a boom hoist drum that raises and lowers a boom 2; 12 a rope sheave pivoted to the upper end of the frame 3; 13 a rope sheave 12;
14 is an equalizer yoke, and 15 is a boom hoist drum 11.
One end is fixed to the rope sheave 12, the direction is changed by the rope sheave 12, and the other end is fixed to the yoke 1.
The wire rope 16 is fixed to the equalizer yoke 14 at one end and the boom 2 at the other end.
Pendant rope fixed to the tip, 17a, 1
7b and 17c are counter weights. As shown in FIG. 4, the boom limit stop 7 includes an outer pipe 7a and an inner pipe 7 that is fitted and slidable inside the outer pipe 7a.
b, and the inner pipe 7b can be fixed in position with respect to the outer pipe 7a by a pin 24 when necessary.

The details of the upper ends of the frames 3 and 5 will be explained with reference to FIG. 2. A link 18 for attaching and detaching a counterweight is pivoted on the same axis as the rope sheave 12 and yoke 13, and the rear end is pivoted to the frame 3 to the link 18. The tip of the rod 20 of the hydraulic cylinder 19 is pivotally connected.

Next, the case of removing the counterweight will be explained with reference to FIGS. 3A to 3E.

First, the boom hoist drum 11 is driven to pay out or wind up the wire rope 15 to bring the boom 2 into a predetermined upright state, and the main drum 8 is driven to unwind the wire rope 9 to lower the hook 10 and move the wire rope 15 as required. A wire rope 22 is attached to a weight 21 fixed at a fixed position, and the hook 10 is hooked onto the wire rope 22 as shown by the two-dot chain line in FIG. Prevent hook 10 from rising.

Next, pins and the like fixing the length of the frame 5 are removed, and the wire rope 15 is let out by the boom hoist drum 11. Then, the wire rope 15 loosens, and the frame 3 rotates counterclockwise in FIG. 1 due to its own weight and the weight of the yoke 13, rope sheave 12, etc., and the frame 5 shortens. When the frame 3 is located at a predetermined position on the counterweight 17a (near the two-dot chain line position in FIG. 3A), the boom hoist drum 11 is stopped.

When the frame 3 has stopped at a predetermined position on the counterweight 17a, the suspension rope 23 is attached to the link 18 and the counterweight 17a while the rod 20 of the hydraulic cylinder 19 is kept shortened, and the wire rope is attached to the link 18 and the counterweight 17a by the boom hoist drum 11. 15 and slightly raise the frame 3 to the two-dot chain line position. With this movement, the counterweight 17a is slightly lifted from the revolving frame 1, and the rod 20 of the fluid pressure cylinder 19 is fully extended and the link 18 is moved to the position shown in Fig. 3. The counterweight 17a is lifted by raising it to the position A in FIG.

When the wire rope 15 is let out, the frame 3 is rotated and lowered by the weight of the counterweight 17a and the like from the two-dot chain line position to the solid line position in FIG. 3A, and the counterweight 17a is lowered to the ground. The lowered counterweight 17a is transported to another location by the necessary means so as not to interfere with the next operation.

After the removal of the counterweight 17a is completed, the wire rope 15 is wound around the boom hoist drum 11, the frame 3 is raised to the vicinity of the solid line position shown in FIG.
With the rod 20 of the hydraulic cylinder 19 shortened, attach the suspension rope 23 to the link 18 and the counterweight 17b, raise the frame 3 a little and lift the counterweight 17b a little from the revolving frame 1, and then fully tighten the rod 20 of the hydraulic cylinder 19. Lift up the counterweight 17b by extending and raising the link 18 to position B in Figure 3B.
While maintaining the angle of the link 18 with respect to the frame 3 in the state shown in FIG. 3B, the frame 3 is gradually lowered as shown in FIG. 3C, and the counterweight 17b is lowered to the ground as shown in FIG. 3D.

When the removal of the counterweight 17b is completed, raise the frame 3 to the vicinity of the solid line position shown in FIG. 23, raise frame 3 slightly and remove counterweight 17.
c is slightly lifted from the revolving frame 1, the rod 20 of the fluid pressure cylinder 19 is fully extended and the link 18 is raised to the position C in Fig. 3, the counterweight 17c is lifted, and the relative relationship between the frame 3 and the link 18 is lifted. Without changing the angle, the frame 3 is gradually lowered as shown in Fig. 3E, and the counterweight 17c is lowered to the ground.

This completes the work for removing the counterweight, but the work order for installing the counterweight is substantially the reverse of the above order, so a description thereof will be omitted.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

According to the counterweight attachment/detachment device of the present invention, a link that swings back and forth by a fluid pressure cylinder is attached to the top of the frame that can be raised and lowered, and the link itself can be used to raise and lower the counterweight.
Since it can move forward and backward, the counterweight can be easily and quickly attached and detached, improving work efficiency, and eliminating the need for an extra crane, reducing equipment costs and operation and maintenance costs, etc. Various excellent effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a crawler crane equipped with the counterweight attachment/detaching device of the present invention, and FIG. 2 is a detailed diagram of the counterweight attachment/detachment device of the present invention.
3A to 3E are explanatory diagrams of the counterweight being removed by the counterweight attaching/detaching device shown in FIG. 2, and FIG. 4 is a detailed diagram of the boom limit stop portion of the crawler crane. In the figure, 1 is a rotating frame, 2 is a boom, 3 and 5 are frames, 8 is a main drum, 11 is a boom hoist drum, 17a, 17b, 17c are counterweights, 18 is a link, 19 is a fluid pressure cylinder, and 20 is a rod shows.

Claims (1)

[Scope of utility model registration request] A link for suspending a counterweight, which can swing back and forth by a hydraulic cylinder, is pivotally connected to the top of the collapsible frame, which is equipped with a rope sheave at the top for guiding a wire rope for hoisting the boom. Counterweight attachment/detachment device.