JPH0355599Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a balance weight for a crawler crane, particularly a balance weight that can be used both as a counterbalance type weight and a lower weight type weight.

[Prior art] As a balance weight to ensure a stable moment during work of a crawler crane and increase the lifting load, a counterbalance is installed at the rear of the upper revolving structure to balance the lifting load. Type weights and lower weight type balance weights that are attached to the frame of the lower traveling body to lower the center of gravity of the entire machine are known.

The above-mentioned counterbalance type has the advantage that during operation, the lifting load and weight are balanced, providing a stable moment for the crane and increasing the lifting load, but when traveling, the tail is too heavy, resulting in poor balance and It has the disadvantage that it is difficult to adapt it to the conditions, and there is a problem that it lacks maneuverability.

In order to solve this problem, the balance weight is composed of a pair (two) of weight blocks, each of which is attached to the rear surface of the revolving frame so that it can be horizontally swiveled. There are known systems in which the position can be moved (for example, see Japanese Utility Model Publication No. 40-35970), but a space for rotating the balance weight between the upper rotating body and the lower traveling body is required. Not only that, but there remains the problem that it is difficult to swing and support the heavy weight block, which is a large object. 30342) is also known, but the problem remains that the turning radius of the rear end becomes large and maneuverability is lacking.

In addition, although the above-mentioned lower weight type has the advantage of not impairing maneuverability, it has the disadvantage that there is a limit to the increase in lifting load. Since it is necessary to use the lower weight for small loads and the counterbalance weight for large loads, it is necessary to prepare balance weights for both purposes, and it is necessary to prepare balance weights for both purposes. As a result, there was a problem in that one of the weights turned into a useless and long item.

[Problems to be solved by this invention] The object of this invention is to eliminate the disadvantages of the above-mentioned counterbalance type and lower weight type balance weights while ensuring their respective advantages, and to solve the above problems. be.

In other words, the balance weight used to secure a stable moment during crawler crane work and increase the lifting load can be used as both a counterbalance type and a lower weight type as needed, so that it can be used when working with large loads. By converting into a counterbalance type crawler crane, or a lower weight type crawler crane when working with small loads or when traveling, the balance weight can be used effectively, allowing for lifting while maintaining the same maneuverability as a standard crane. The purpose is to provide a crawler crane with large capacity.

[Means for Solving the Problem] This invention provides a means for solving the above problem, and includes two balance weights 24 each having a plurality of connecting flanges 25 on one side.
a, 24b are mounted on a weight cart 22 which can be freely connected to the rear of the upper revolving body 4 via a connecting stay 21, and can be connected to the weight cart 22 by a connecting pin 26, and the lower frame A connecting flange 27 corresponding to the connecting flange 25 is protrudingly provided at the front and rear of the lower frame 2, and the two balance weights 24a, 24b can be connected to the front and rear of the lower frame 2 by a connecting pin 26. The purpose of this invention is to provide a balance weight for a crawler crane, which is characterized in that it can be used both as a counterbalance type balance weight and a lower weight type balance weight.

[Embodiments] The present invention will be described below with reference to embodiments shown in the drawings.

Figures 1 and 2 show the balance weight of the present invention used in a counterbalance type crawler crane, and Figures 3 and 4 similarly show it used in a lower weight type crawler crane. Since the configurations of the crawler cranes themselves are the same, the general configuration of the crawler cranes will be explained first, and then the differences will be explained.

Reference numeral 1 denotes a lower traveling body, which is composed of a lower frame 2 and crawlers 3 attached to both sides of the lower frame.

Reference numeral 4 denotes an upper rotating body, which is rotatably mounted on the lower traveling body 1.

A boom 5 is pivotally mounted to the front of the upper revolving body 4 so that it can be raised and lowered.

Reference numeral 6 denotes a mast, which is pivotally attached to the upper revolving structure 4 in the opposite direction to the boom 5.

The mast 6 is restrained in elevation by a mast 7 fixed to the upper revolving structure 4 and a mast support rope 8 attached to the mast 7.

Reference numeral 9 denotes a boom support rope, one end of which is attached to the tip of the boom 5, and the other end connected to a boom elevation drum provided on the upper revolving structure 4 via a bridle 10, a bail 11, a guide sheave 12, and a boom elevation rope 13. It is installed on 14.

Therefore, the boom 5 takes up the elevation drum 14,
Look up by rewinding.

Reference numeral 15 denotes a hanging load, which is suspended from a main hoisting rope 17 via a hook 16, and the other end of the rope is attached to a main hoisting drum 18 provided on the upper revolving structure 4.

Therefore, the hanging load 15 is raised and lowered by winding and unwinding of the drum 18.

19 is a boom back stop, which restricts the elevation angle of the boom 5.

20 is a mast buck stop, which restricts the depression angle of the mast 6.

The above structure is exactly the same as that of a known crawler crane, but when used as a counterbalance type crawler crane shown in FIGS. A connected weight cart 22 is suspended from the top of the mast 6 by a weight cart support rope 23.

Two balance weights 24a, 24 are mounted on the weight cart 22 at a connecting flange 25.
It is pivotally connected via a connecting pin 26.

In addition, when used as a lower weight type crawler crane, as shown in Figures 3 and 4,
Connecting flanges 27 are protrudingly provided at the front and rear of the lower frame 2 so as to correspond to the connecting flanges 25 of the balance weights 24a and 24b.
7 to two balance weights 24a, 24
b are pivotally connected to each other by the connecting pin 26, one at the front and one at the rear.

Therefore, when using the balance weights 24a and 24b as weights for a counterbalance type crawler crane (Figs. 1 and 2), the suspended load 1
5, if the moment of the crane body is sufficient, the weight truck 22 is on the ground as shown in FIG.
It maintains a balance with this and demonstrates its powerful lifting ability.

In addition, when used as a weight for a lower weight type crawler crane, it is possible to obtain a larger lifting capacity than a standard crane without impairing mobility such as running performance as with a standard crane.

[Effect of the invention] According to the invention, the same balance weight can be
Since it can be used as both a counterbalance type and a lower weight type as needed, it can be used as a counterbalance type crawler crane when lifting large loads, and when lifting small loads or when traveling. It is possible to transform into a lower weight type crawler crane, and there is no need to prepare two types of weights, a counterbalance weight and a lower weight, and the balance weight can be used effectively. By taking advantage of the strengths of each and eliminating the weaknesses, it is possible to provide a crawler crane with a large lifting capacity while ensuring the same maneuverability as a standard crane.

[Brief explanation of drawings]

Fig. 1 is a side view of the invention applied to a counterbalance type crane, Fig. 2 is a plan view taken along line A to Fig. 1, and Fig. 3 is a side view of the invention applied to a lower weight type crane. Figure 4 is B~ in Figure 3.
It is a top view along a line. 2... Lower frame, 22... Weight cart, 25, 27... Connection flange, 26... Connection pin.

Claims (1)

[Scope of utility model registration request] 2 each having a plurality of connecting flanges on one side
The balance weights are mounted on a weight truck which can be freely connected to the rear of the upper revolving body via a connecting stay, and each can be connected to the weight truck by a connecting pin. A connecting flange corresponding to the connecting flange is provided protrudingly, and the two balance weights can be connected at the front and rear of the lower frame by connecting pins, so that the balance weight can be used as a counterbalance type balance weight and a lower weight type balance weight. A balance weight for crawler cranes that is characterized by: