JPH05105394A - Auxiliary jib device for crane - Google Patents

Abstract

(57) [Summary] [Purpose] In an auxiliary jib device that stores the auxiliary jib of a crane in a folded state along the side of the boom, a method of operating the auxiliary jib between its use position and its storage position is as follows. Depending on the situation at the work site, it is possible to select one of the two methods, horizontal swing and upper swing. [Structure] An auxiliary jib device capable of laterally swinging out,
The auxiliary jib body 4 is provided with a hydraulic cylinder 8 for rotating the auxiliary jib body 4 rotatably in the vertical direction via the horizontal shaft 5 on the auxiliary jib rotation frame 3. The feature is that it is possible to swing out upward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores an auxiliary jib mounted at the tip of a boom, which is a lifting device for a mobile crane, which is a type of construction machine, in a folded state along the side of the boom. It concerns a folding jib boom designed to be obtained.

[0002]

2. Description of the Related Art FIG. 13 shows a side view of a conventional mobile crane when the auxiliary jib is stored, and FIG. 14 shows a side view when the auxiliary jib is also extended. In the figure, a telescopic boom D that is hoisted by a hoisting cylinder C is provided on an upper revolving structure B provided on a lower vehicle body A so as to be hoistable. Figure of auxiliary jib E
In Fig. 13, the boom D is laterally held, and Fig. 14 shows a state in which the auxiliary jib E is extended to the tip of the boom D.
Is a hook and H is a wire rope.

The auxiliary jib is stored at the storage position shown in FIG.
As a method for changing the position between the use position shown in FIG. 1 and the use position shown in FIG. FIG. 15 is a side view for explaining the downward drawing, and FIG. 16 is a top view for explaining the lateral drawing. In both of these two methods, in a narrow place where there is an obstacle such as a building indicated by bu in the figure, the obstacle cannot be extended because it interferes with the obstacle during the auxiliary jib extension process. There was a big problem that the work process was complicated and dangerous.

Further, as a method of operating the auxiliary jib between its use position and storage position, there are two methods of swinging out the auxiliary jib according to the situation of the work site: horizontal swing-out and downward swing-out. A method and an apparatus for selecting either one are known. This technology is described in "Japanese Patent Publication No. 3-23479" and "Japanese Patent Application No. 61-172399".
It is well known in.

[0005]

However, there is the following big problem in the method capable of selecting one of the two methods of the horizontal drawing and the downward drawing. (1) When lowering the auxiliary jib, it is necessary to have enough space for the auxiliary jib to hang down below the boom when the auxiliary jib is bent downward from the retracted position on the side of the boom. The boom must be raised once before any operation. When the auxiliary jib is in the use position on the front of the boom, the boom must be leveled and the connecting pins, etc. must be inserted. For this reason, the boom must be raised (50 ° to 60 ° in angle). This means that the prone operation must be performed again, which is unnecessarily time-consuming and labor-intensive. (2) When bending the auxiliary jib downward from the side position of the boom, which is the storage position, it was necessary to extend the boom. The auxiliary jib is fixed to the boom when not in use and must be removed before use. However, when bending the auxiliary jib downwards as described above, the auxiliary jib must be pulled forward to a position where this fixing device does not interfere, so that the auxiliary jib must be connected to the boom and extended for about 3 m. Was necessary. (3) When the auxiliary jib is bent to the lower side of the boom, an external force is required for the operation to swing (swing) to the use position on the front of the boom and rotate 180 °. For example, it is known that the crane uses a wire rope for hoisting and a hydraulic cylinder, and it cannot be easily operated by human power. In other words, swinging the auxiliary jib toward the front of the boom means that a force must be applied in the direction of lifting the weight of the auxiliary jib, which is unavoidable, and this requires a great amount of force. For this reason, the operation is not complicated, and an actuator such as a hydraulic cylinder has to be attached, which has many drawbacks in terms of cost. The above-mentioned three problems regarding the downward extension of the auxiliary jib complicate the operation of extending the auxiliary jib, and the structure of the auxiliary jib is also complicated in detail. As described above, there are two methods of operating the auxiliary jib, namely, downward swinging and horizontal swinging out. As described above, there is a problem that the downward swinging is larger, and the horizontal swinging out is simpler in the process. Although generally used, there is a problem in drawing out in a narrow place as described in FIG.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and is an auxiliary jib device capable of laterally swinging out, the auxiliary jib rotating frame being vertically movable through a horizontal shaft. As a method of operating the auxiliary jib between its use position and its storage position by providing a hydraulic cylinder that rotates the auxiliary jib body that is rotatably attached about a horizontal axis, depending on the situation of the work site. In this way, it is possible to select either of the two methods of horizontal drawing and upper drawing.

Further, a hydraulic cylinder for rotating the auxiliary jib main body in the auxiliary jib device about a horizontal axis is provided with an auxiliary jib rotating frame via a frame body having both ends pivotally rotatable and a link. By connecting with the auxiliary jib body, the auxiliary jib body can be power tilted as needed during work.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are drawings for explaining a first embodiment of an auxiliary jib device according to the present invention. FIG. 1 is a side view showing a state in which the auxiliary jib is stored on the side of the boom, and FIG. FIG. 5 is a side view when in a use state, FIG. 3 is a view taken in the direction of arrow Y3 in FIG. 1, FIG. 4 is a view taken in the direction of arrow Y4 in FIG.
FIG. 3 is a side view of the auxiliary jib bent over the boom. The auxiliary jib shown by the solid line shows the auxiliary jib body on the side of the boom 1, and the auxiliary jib shown by the chain double-dashed line shows the auxiliary jib body 4 ′. Shows a state in which is located in front of the boom 1.

In the figure, an auxiliary jib 2 mounted on the tip portion 1a of the boom 1 is composed of two parts, an auxiliary jib rotating frame 3 and an auxiliary jib body 4, and the auxiliary jib rotating frame 3 and the auxiliary jib are included. The upper part of the main body 4 is rotatably connected via a horizontal shaft 5, and the lower part thereof is connected via a rotatable pivot shaft 21, a hydraulic cylinder 8 and a rotatable pivot shaft 22. When the auxiliary jib 2 is in front of the boom tip 1a as shown in FIG. 2 and is in use, the auxiliary jib rotation frame 3 and the boom tip 1a are used. The part 1a is a rotary connecting device 6 (see FIG.
, The upper and lower two holed plates 11 fixed to the auxiliary jib rotating frame 3 side, the upper and lower two sets of bifurcated plates 10 and two rotating connecting pins 9 fixed to the boom tip 1a side. And the connecting device 7 (see FIG. 4), the upper and lower two holed plates 12 fixed to the auxiliary jib rotating frame 3 side, and the boom tip part. 1
2 sets of upper and lower bifurcated plates 13 fixed to the a side, and two connecting pins (not shown) are added to form a connecting device 7). Reference numeral 14 is a hydraulic hose reel for a hydraulic hose to the hydraulic cylinder 8, and reference numerals 15 and 16 are fixing pins for fixing the auxiliary jib body 4 in the retracted state to the side surface of the boom 1 as shown in FIG. ..

Next, the operation of the first embodiment will be described. When there is sufficient space on the side of the crane vehicle at the work site (see Fig. 16), when the crane is operated by horizontal swinging as in the conventional case and there is not enough space on the side of the crane vehicle, the features of this invention Since it can be operated by the upward swing, the upward swing will be described below. First, the forked plate 10 provided on the side of the tip boom 1a and the plate 11 with a hole provided on the side of the auxiliary jib rotating frame 3 are fixed by the rotating connecting pin 9.
Next, a fixing pin for fixing the auxiliary jib body 4 and the boom 1
Remove 15, 16. Next, after raising the boom 1 by only 1 ° to 2 °, the hydraulic cylinder 8 is extended and the auxiliary jib body 4
Stand up to about 90 ° to boom 1 (see Fig. 5). The reason why the boom 1 is slightly raised here is to prevent the auxiliary jib body 4 from rotating forward of the boom 1 while the auxiliary jib body 4 is being raised. This is because the auxiliary jib rotating frame 3 tries to hold the storage position on the side of the boom 1 by the weight of the auxiliary jib body 4. It is also possible to carry out this by another operation, for example, by fixing with a detachable pin or the like that determines the position of the auxiliary jib rotating frame 3.

The next operation is to lower the boom 1 slightly from horizontal. As a result, the auxiliary jib rotation frame 3 is rotated to the front position of the boom 1 by the weight of the auxiliary jib body 4 (the position of the auxiliary jib body shown in FIG. 5 by the chain double-dashed line 4 '). Immediately after the auxiliary jib 2 moves to the front position of the boom 1, the hydraulic cylinder 8 is contracted, and the auxiliary jib body 4 is laid down and set to the use position as shown in FIG. Finally, the other side surface of the boom 1 and the other side (7, 7 shown in FIG. 3) of the auxiliary jib rotating frame 3 are connected to each other by a connecting device 7
(The plate 12 with holes and the bifurcated plate as described in FIG.
13 and a connecting pin (not shown)).

Here, the auxiliary jib 2 is rotated to the front surface of the boom 1 by laying the boom 1 down.
May be made horizontal so that the auxiliary jib rotating frame 3 is in a rotationally unstable state, and the driver's vehicle may swing forward manually. Also,
Here, the hydraulic cylinder 8 is used to raise the auxiliary jib body 4, but it is also possible to wind up a winch (not shown) instead.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be explained using 12. 6 corresponds to FIG. 1 described above, FIG. 7 corresponds to FIG. 2, FIG. 8 corresponds to FIG. 3, FIG. 9 is a view taken along the arrow Y9 in FIG. 6, and FIG. 10 corresponds to FIG. FIG. 11 is FIG.
12 is a side view for explaining the power tilt, which is the feature of the second embodiment. The devices having the same functions as those in the first embodiment described with reference to FIGS. 1 to 5 are designated by the same reference numerals, and the main difference between the second embodiment and the first embodiment is that the auxiliary jib is used. The structure in which the rotating frame 23 and the auxiliary jib body 4 are connected at the bottom is that the hydraulic cylinder 8 is connected via the frame 24 and the link 25. The hydraulic cylinder 8 is connected to the auxiliary jib rotating frame 23 by a rotatable pivot shaft 26, the other end is connected to a rotatable pivot shaft 29, and the pivot shaft 29 is also connected to the frame 24 and one end of the link 25. The other end of the frame body 24 is connected to the auxiliary jib rotating frame 23 via a rotatable pivot shaft 27, and the other end of the link 25 is connected to the auxiliary jib body 4 via a rotatable pivot shaft 28. ing.

Next, the operation of the second embodiment will be described. The overhang of the auxiliary jib 2 is the same as that of the first embodiment (see FIG. 11). Next, the power tilt, which is a feature of the second embodiment, will be described. Figure 7
When the hydraulic cylinder 8 is further contracted from the state in which the auxiliary jib body 4 is swung out to the front of the boom 1 as shown in Fig. 12 (the boom 1 is raised in advance at an appropriate angle), as shown in Fig. 12, The auxiliary jib body 4 is rotated downward (referred to as tilt) via the frame 24 and the link 25 as shown in FIG.
The tilt angle can be arbitrarily set during the auxiliary jib work (referred to as power tilt). Further, by extending the hydraulic cylinder 8, it is possible to tilt upward as shown in FIG. 11, so that the working range is greatly expanded.

[0015]

The present invention is constructed as described above in detail, and the auxiliary jib body can be selected from the two methods of horizontal swing-out and upper swing-out according to the situation of the work site. In this case, the auxiliary jib can be swung to the work position, and the upward swing operation can be swung in the same process as the horizontal swing, which is a great effect that work safety and efficiency are greatly improved. ..
By simply adding a frame and links, the power tilt of the auxiliary jib is possible and the working range is greatly improved.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment of the present invention in a state where an auxiliary jib is stored.

FIG. 2 is a side view of the same auxiliary jib in use.

FIG. 3 is a view on arrow Y3 in FIG.

FIG. 4 is a view on arrow Y4 in FIG.

FIG. 5 is a side view showing a state in which the auxiliary jib is bent above the boom.

FIG. 6 is a view corresponding to FIG. 1 and showing a second embodiment of the present invention.

FIG. 7 is a drawing corresponding to FIG. 2 described above.

FIG. 8 is a drawing corresponding to FIG. 3 described above.

FIG. 9 is a view on arrow Y9 in FIG.

FIG. 10 is also a drawing corresponding to FIG. 4 described above.

FIG. 11 is also a drawing corresponding to FIG. 5 described above.

FIG. 12 is a side view for explaining a power tilt in the second embodiment.

FIG. 13 is a side view of the conventional mobile crane when the auxiliary jib is stored.

FIG. 14 is a side view when the auxiliary jib is also extended.

FIG. 15 is a side view for explaining a method of swinging out the auxiliary jib.

FIG. 16 is a top view for explaining a method of laterally swinging out the auxiliary jib.

[Explanation of symbols]

 1 Boom 2 Auxiliary jib 3 Auxiliary jib rotating frame 4 Auxiliary jib body 5 Horizontal shaft 6 Rotating connecting device 7 Connecting device 8 Hydraulic cylinder 21 Axis 22 Axis 23 Auxiliary jib rotating frame 24 Frame 25 Link 26 Axis 27 Axis 28 Axis 28 29 Axis

Claims (2)

[Claims] 1. A two-position changing operation of a position where the auxiliary jib 2 of the crane is folded and stored along the side of the boom 1 and a position where the auxiliary jib 2 is extended to the tip of the boom 1 and is operated. It is an auxiliary jib device that can be installed, and the front position of the front end of the boom 1 and the boom 1 from the front position.
An auxiliary jib which is rotatably mounted between the reversing position which is rotated by about 180 ° to the side and is detachably attached to one side of the tip of the boom 1 through the rotation coupling device 6 so as to be freely rotatable. Between the other side of the base of the rotating frame 3 and the other side of the tip of the boom 1, the auxiliary jib rotating frame 3 is provided in front of the boom 1 in cooperation with the rotating connecting device 6. An auxiliary jib rotating frame 3 having a releasable connecting device 7 fixed to the auxiliary jib; and an auxiliary member whose base end is attached to the auxiliary jib rotating frame 3 via a horizontal shaft 5 so as to be vertically rotatable. The jib main body 4; and a hydraulic cylinder 8 interposed between the auxiliary jib main body 4 and the auxiliary jib rotating frame 3 for rotating the auxiliary jib main body 4 about the horizontal shaft 5; A clue characterized in that the jib body 4 can be swung upward. Down of the auxiliary jib equipment. 2. The auxiliary jib device according to claim 1, wherein the hydraulic cylinder 8 for rotating the auxiliary jib body 4 comprises:
An auxiliary jib device for a crane, which is connected between an auxiliary jib rotating frame 3 and an auxiliary jib body 4 via a frame 24 and a link 25.