JPH078549Y2 - Crane mounting structure such as jib - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a mounting structure for a jib or the like in a crane, and more particularly to a mounting structure for a roughing jib of a large crane.

[Prior Art] In a crane, in particular, a large crane, work is often performed by distinguishing low-speed hoisting and lowering of heavy objects from high-speed hoisting and lowering of lightweight objects. A large number of wires are hung between the head sheave and the hook sheave of the boom, and in the latter case, a jib is attached to the tip of the boom and the hook is suspended by one hook from the head sheave of the jib.

When the jib is attached to the boom, the jib attachment angle is preset to the boom guy line rope and the jib guy line rope.To change the jib angle, use the boom guy line rope or jib guy line rope. I had to adjust the length.

In order to solve this, a luffing jib has been developed in which the mounting angle of the jib can be arbitrarily adjusted, and this luffing jib is designed to perform the entire jib system by a rope winding device via a rope or bridle.

[Problems to be solved by the invention] However, in the luffing jib in which the jib angle is adjusted by winding and unwinding the rope of the rope winding device, the rope is unnecessarily removed from the rope winding device when the jib is disassembled and assembled. If extended, the jib and boom may interfere and damage or
There is a problem that it may be damaged.

An object of the present invention is to solve the above-mentioned problems and to stop the rotation of the jib system before the jib contacts the boom when the rope is unwound from the rope winding device and the jib system is rotated. It is intended to provide a mounting structure for a jib or the like that enables

[Means for Solving the Problems] The present invention provides means for solving the above problems, in which a boom adapter 7 is fixedly installed on the top of the innermost boom 3a of the telescopic boom 3, and the boom adapter 7 is fixed. Jib on top
The base end of 10 is rotatably pivotally attached, the base end of the front post 12 is pivotally attached near the pivot point of the jib 10, and the base end of the rear post 14 is attached near the pivot point of the front post 12. Pivoted,
A crane that connects the ends of the jib 10, the front post 12, and the rear post 14 to each other by connecting members 21 and 19, and raises and lowers the jib 10 via ropes or bridles 5, 16 and 17 connected to the ends of the rear posts 14. In the jib mounting device of the above, the base end of the telescopic bar 24 having a stopper capable of multistage expansion and contraction and the one end of the mast 26 are pivotally attached to the rear end side rear face of the boom adapter 7 and the mast 26, respectively. A jib or the like in a crane characterized in that a lug 26a having a cutout portion that engages with the bridle 16 is fixed to the other end of 26, and the lug 26a and the tip of the telescopic bar 24 are rotatably connected to each other. The mounting structure of is the gist of the invention.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes an upper revolving structure, which is rotatably mounted on a lower traveling structure 2. An extendable boom 3 is pivotally attached to a front part of the upper revolving structure 1 by a boom raising / lowering cylinder 4 so that the boom 3 can move up and down.
A rope winding device 6 that winds and unwinds is mounted.

A boom adapter 7 is fixed to the top of the innermost boom 3a of the telescopic boom 3 by pins 8 and 9,
The base end of the jib 10 is rotatably pivotally attached to the top of the jib 10 by a pin 11, and the base end of a front post 12 is pivotally attached to the jib 10 near the pivot point by the pin 13.
A base end of a rear post 14 is pivotally attached by a pin 15 near the pivot point of 12.

The jib lifting rope 5 unwound from the rope winding device 6 is wound around a bail (not shown) and a bridle 16, and the bridle 16 is connected to one end of a pendant rope 17 by a pin 18 to form a pendant rope. The other end of 17 is connected to the tip of the rear post 14 by a pin 20 together with one end of a connecting member 19 having a predetermined length. The other end of the connecting member 19 is connected to the front end of the front post 12 by a connecting member 21 having a predetermined length.
And a second end of the connecting member 21 is pivotally connected to the tip of the jib 10 by a pin 23.

A base end of a telescopic bar 24, which has a stopper for stopping in the most extended state and which can be expanded and contracted in multiple stages, is pivotally attached by a pin 25 to the rear surface of the boom adapter 7 on the base end side. One end of mast 26 is pin 27
And a lug 26a having a notch engaging with the bridle 16 is fixed to the other end of the mast 26, and the lug 26a is pivotally attached to the tip of the telescopic bar 24 by a pin 28. It is worn.

[Operation] The operation of the present invention will be described with reference to the above embodiment.

When the work is completed and the jib 10 is folded and stored on the side of the boom 3, when the jib raising / lowering rope 5 is unwound from the rope winding device 6, the jib system turns to the front side and reaches the predetermined position. It engages with the notch of the lug 26a fixed to one end of it, pushes up the mast 26, and at the same time extends the telescopic bar 24. Then, when the telescopic bar 24 is in the most extended state and the jib system is rotated to a predetermined position, the stopper works, and even if the jib elevation rope 5 is further extended from the rope winding device 6, the jib system does not rotate any more.

Next, when the stored state is changed to the working state, when the rope 5 is wound up by the jib raising / lowering rope 6, the jib system is rotated to the rear side and the telescopic bar 24 is contracted to reach a predetermined position. Then, the bridle 16 is disengaged from the lug 26a of the mast 26.

[Effects] According to the present invention, in the luffing jib, the base end of the telescopic bar 24 that is capable of multi-step expansion and contraction and has a stopper on the rear end side rear surface of the boom adapter 7 fixed to the top of the innermost boom 3a of the telescopic boom 3. Mast 26 on the back of the tip side.
And a lug 26a having a cutout portion engaging with the bridle 16 is fixed to the other end of the mast 26, and the lug 26a and the tip of the telescopic bar 24 are rotatably connected to each other. By doing so, when the rope is unwound from the rope winding device and the jib system is rotated, the rotation of the jib system can be stopped before the jib 10 comes into contact with the boom 3. In the case of folding and storing the jib, the jib 10 and the boom 3 do not interfere with each other to damage or damage the jib or the boom 3 even if the jib lowering rope 5 is unwound from the rope winding device 6 more than necessary. Has a remarkable effect.

[Brief description of drawings]

FIG. 1 is an overall side view of a truck crane adopting the present invention, FIG. 2 is an enlarged side view of a jib mounting portion according to the present invention, and FIGS. 3 and 4 are detailed side views of the same. 3: Boom, 3a: Innermost boom 5: Jib elevation rope 7: Boom adapter 12: Front post 14: Rear post 16: Bridle 17: Pendant rope 19, 21: Connecting member 24: Telescopic bar 26: Mast, 26a: Lug

Claims (1)

[Scope of utility model registration request] 1. The innermost boom (3) of the multi-stage telescopic boom (3).
a) A boom adapter (7) is fixedly mounted on the top part, a base end of the jib (10) is rotatably pivoted to the top part of the boom adapter, and a front post (12) is provided near the pivot point of the jib (10). )
The base end of the rear post (14) is pivotally attached near the pivot point of the front post (12), and the tips of the jib (10), the front post (12) and the rear post (14) are attached. The jib of the crane, which is connected to each other by connecting members (21) and (19), and which raises and lowers the jib (10) via a rope or bridle (5, 16, 17) connected to the tip of the rear post (14). In the attachment device, a base end of a telescopic bar (24) having a stopper capable of multistage expansion and contraction is attached to a rear end side rear face of the boom adapter (7), and one end of a mast (26) is pivotally attached to a rear end side rear face. , A lug (26a) having a notch engaging with the bridle (16) is fixed to the other end of the mast (26), and the lug (26a) and the tip of the telescopic bar (24) are rotatable relative to each other. A crane in a crane characterized by being connected to Mounting structure and the like.