JP4484279B2 - Flexible material guide device for bending and stretching booms - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a guide device for a flexible material used for a bending boom.
[0002]
[Prior art]
The bending boom A is configured as shown in FIG. 4, and the boom body includes a lower boom 1 and an upper boom 2. The upper boom 2 is pivotally connected 3 to the abdomen side of the distal end portion 1b of the lower boom 1, that is, the inner side when bent, and the abdomen side of the base end portion 2a is pivotally connected 3 to the base end portion 1a of the lower boom 1 Further, it is configured to be able to bend and stretch between a retracted position where it is bent and an extended position where the distal end portion 2b is brought close. In many cases, the lower boom 1 or the upper boom 2 is configured to be extendable and contractible, and FIG. 4 shows a case where both the lower boom 1 and the upper boom 2 are three-stage extendable booms.
[0003]
The bending / extension mechanism B that bends and extends the upper boom 2 relative to the lower boom 1 includes a first link member 4, a second link member 6, and a bending / extending cylinder 9. The first link member 4 is pivotally connected 5 at its one end 4a to the back side of the tip 1b of the lower boom 1, that is, the outer side when bent, and the second link member 6 is connected to the upper boom 2 One end 6a is pivotally connected to the back side of the base end portion 2a of the first link member 7, and the other end 6b is pivotally connected to the other end 4b of the first link member 4 so as to be swingable on the ventral side of the upper boom 2. 8. The bending / extending cylinder 9 is interposed between the other end 4b of the first link member 4 and the distal end side of the upper boom 2 so as to be extendable. The bending cylinder 9 is interposed at the other end 6b of the second link member 6 instead of the other end 4b of the first link member 4 or at an appropriate position of the lower boom 1 instead of the upper boom 2. Sometimes.
[0004]
Further, the bending boom A is provided with a flexible material 10 such as a hydraulic hose, a pneumatic hose, an electric cable or the like that supplies energy or transmits a signal between the lower boom 1 side and the upper boom 2 side. 1 is connected between a lower connection port 11 located on one side surface and an upper connection port 12 located on a side surface of the upper boom 2. Specifically, since the lower boom 1 can be extended and retracted, the reel 31 is connected to the lower connection port 11, and one end of the flexible material 10 connected to the reel 31 and wound and stored is connected to the upper connection port 12. It is connected to a universal joint 51 that follows the attached angle change. In the middle of the lower connection port 11 and the upper connection port 12, a guide roller 32 is pivotally connected 33 to the second end portion 1 b 2 of the lower boom 1, and the guide sheave 52 is connected to the first link member 4 and the first link member 4. The two-link member 6 is pivotally connected 53 in the vicinity of the pivot connection 8 so as to be rotatable, and the flexible member 10 is connected through the guide roller 32 and the guide sheave 52.
[0005]
The bending boom A configured in this way is pivotally connected 37 to a swivel base 36 mounted on a vehicle 34 having an outrigger 35, and the hoisting cylinder 38 is provided between the swivel base 36 and the lower boom 1. It is inserted in a telescopic manner. Then, such a bending boom A is used as a boom for an aerial work vehicle or a mobile crane vehicle by suspending a high-altitude work bucket 39 or a heavy load lifting hook from the tip 2b of the upper boom 2. It is done.
[0006]
For high-altitude work or crane work, after the vehicle 34 is installed by the outrigger 35, the swivel 36 is swung, the bending boom A is bent by the hoisting cylinder 38, the upper boom 2 is bent and extended by the bending cylinder 9, and the lower part The boom 1 and the upper boom 2 are appropriately expanded and contracted, and the tip 2b of the upper boom 2 is positioned at a position suitable for work. And work. When the operation at this position is completed, the various operations described above are performed as appropriate, and the distal end portion 2b of the upper boom 2 is positioned at the next operation position to perform the operation.
[0007]
[Problems to be solved by the invention]
By the way, a universal joint 51 that follows an angle change is attached to the upper connection port 12 for the following reason. That is, the angle θ1 with respect to the line 1c in which the flexible material 10 is parallel to the boom axis of the lower boom 1 and the angle θ2 with respect to the line 2c in which the flexible material 10 is parallel to the boom axis of the upper boom 2 are In order to reduce damage to the flexible material 10 due to changes in the angles θ1 and θ2, the universal joint 51 that follows the changes in the angles θ1 and θ2 needs to be used. However, the universal joint 51 that follows the change in angle is more complicated in structure than the fixed joint, has a large weight, size, and high cost. There are problems with ease of handling and cost.
[0008]
In addition, by placing the upper connection port 12 on the distal end side of the upper boom 2, a heavy object is disposed on the distal end side. Therefore, in order to avoid a decrease in strength and stability caused by placing a heavy object on the distal end side, and an increase in the path length of the flexible material 10 in the upper boom 2 particularly when the telescopic boom is used, the base end of the upper boom 2 is avoided. The upper connection port 12 is to be arranged in the part 2a. However, when the upper connection port 12 is disposed at the base end portion 2 a of the upper boom 2, the aforementioned change in the angle θ <b> 2 is greater than when the upper connection port 12 is disposed at the distal end side of the upper boom 2. That is, it becomes more necessary to use the universal joint 51 that follows the change in the angle θ2. However, as described above, the universal joint 51 has problems in the degree of freedom in arrangement, ease of handling, and cost.
[0009]
The subject of this invention is solving these problems and providing the structure which can employ | adopt a fixed coupling.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the guide device for a flexible material used for the bending boom of the present invention is provided with two guide sheaves, and changes in the angle θ1 and the angle θ2 are made as small as possible.
[0011]
In the first aspect, the lower boom 1 and the lower boom 1 are pivotally connected and pivotally connected to the lower side of the lower end of the lower end boom 1, that is, on the inner side when bent. The upper boom 2 that can be bent and retracted between the retracted position and the extended extended position, and the back side of the distal end 1b of the lower boom 1, that is, when bent. A first link member 4 having one end 4a pivotably connected 5 to the outer side and a rear end of the base end portion 2a of the upper boom 2 and one end 6a pivotably connected 7 to the outer side. The other end 6b is pivotally connected 8 to the other end 4b of the first link member 4 so as to be swingable on the ventral side of the upper boom 2, and the other end 4b of the first link member 4 or the second link. A bending / extending cylinder interposed between the other end 6b of the member 6 and the upper boom 2 or the lower boom 1 at an appropriate position. In a bending boom A comprising a slider 9 and a flexible member 10 connected between a lower connection port 11 located on a side surface of the lower boom 1 and an upper connection port 12 located on a side surface of the upper boom 2. A first guide sheave 21 pivotally connected to the first link member 4 is provided outside the swing surface of the first link member 4 and outside the swing surface of the second link member 6. A second guide sheave 23 pivotally connected to the second link member 6 is provided, and the flexible material 10 is connected to the first guide sheave 21 and the second guide sheave 23 from the lower connection port 11. After that, it is configured to be connected to the upper connection port 12.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the guide apparatus of the flexible material used for the bending boom of this invention is demonstrated based on FIGS. 1-3. Note that reference numerals 1 to 12, A to B, and 31 to 39 described below are the same as those described in the related art, and thus detailed description thereof will be omitted. To do.
[0013]
In an embodiment according to claim 1, the boom body includes a lower boom 1 and an upper boom 2, and the upper boom 2 has a base end 2a at the tip of the lower boom 1 as in the prior art. It is pivotally connected 3 to the part 1b and is configured to be able to bend and stretch between the retracted position and the extended position.
[0014]
The bending mechanism B includes a first link member 4, a second link member 6, and a bending cylinder 9. The first link member 4 is connected to the lower boom 1 at its one end 4a, as in the prior art. The second link member 6 has one end 6 a pivotally connected to the upper boom 2 and the other end 6 b pivotally connected to the other end 4 b of the first link member 4. 9 is interposed between the other end 4b of the first link member 4 and the front end side of the upper boom 2 so as to be extendable.
[0015]
Further, the bending boom A is provided with a flexible material 10 such as a hydraulic hose, a pneumatic hose, an electric cable or the like that supplies energy or transmits a signal between the lower boom 1 side and the upper boom 2 side. 1 is connected between a lower connection port 11 located on one side surface and an upper connection port 12 located on a side surface of the upper boom 2. In the figure, since the lower boom 1 is made telescopic, the reel 31 is connected to the lower connection port 11, the flexible material 10 having one end connected to the reel 31 is wound and stored, and the guide roller 32 is connected to the lower boom. 1 is pivotally connected 33 to the second end portion 1b2 in the same manner as the prior art.
[0016]
The above is the same as the conventional technique, but the technique of the present invention will be described below.
[0017]
21 is a first guide sheave, 23 is a second guide sheave, 22 and 24 are pivotally connected, and the first guide sheave 21 is outside the swing surface of the first link member 4 and is first The second guide sheave 23 is pivotally connected to the second link member 6 so as to be pivotally connected to the second link member 6 outside the swinging surface of the second link member 6. ing.
[0018]
Therefore, the flexible member 10 is connected to the upper connection port 12 through the first guide sheave 21 and the second guide sheave 23 from the reel 31 connected to the lower connection port 11.
[0019]
The bending boom A constructed in this way is mounted on the vehicle 34 in the same manner as in the prior art, and is used as a boom for an aerial work vehicle or a mobile crane vehicle. In the same manner as in the prior art, after the vehicle 34 is installed by the outrigger 35, the swivel movement of the swivel 36, the hoisting movement of the bending boom A by the hoisting cylinder 38, and the bending cylinder 9 of the upper boom 2 are performed. The bending and extension and the lower boom 1 and the upper boom 2 are appropriately expanded and contracted, and the distal end portion 2b of the upper boom 2 is positioned at a position suitable for the operation to perform the operation.
[0020]
By the way, as described above, the angle θ1 with respect to the line 1c in which the flexible material 10 is parallel to the boom axis of the lower boom 1 and the angle θ2 with respect to the line 2c in which the flexible material 10 is parallel to the boom axis of the upper boom 2 are It changes depending on the degree of bending of the upper boom 2. However, according to the present invention, the amount of change in these angles θ1 and θ2 can be made as small as possible. Therefore, even if the joint portion of the upper connection port 12 or the lower connection port 11 is fixed, the flexible material 10 is not damaged, and therefore the universal joint 51 need not be used. Therefore, the degree of freedom of arrangement, ease of handling, and cost of the upper connection port 12, the lower connection port 11, and the joint are improved.
[0021]
Since the amount of change in the angle θ1 and the angle θ2 is as small as possible, the upper connection port 12 and the lower connection port 11 are brought closer to the pivot connection 3 in the range of the angle θ1 and the angle θ2 that are less than the allowable angle. It becomes possible. In particular, since the upper connection port 12 is brought closer to the base end 2a side of the upper boom 2, it is effective in strength, stability, and shortening of the path length of the flexible material 10.
[0022]
Since the first guide sheave 21 and the second guide sheave 23 are used as guide sheaves, the winding angle of the flexible material 10 around each guide sheave is approximately 90 ° at the maximum. Therefore, the life of the flexible material 10 is not reduced in this wound portion.
[0023]
In the above description, it has not been mentioned whether the upper boom 2 can be expanded or contracted. However, as shown in FIG. On the contrary, the lower boom 1 may not extend and contract, and in this case, the reel 31 and the guide roller 32 may be omitted.
[0024]
The guide sheave may be a plurality of small-diameter rollers arranged along a substantially pitch circle of the guide sheave.
[0025]
Furthermore, the bending cylinder 9 is positioned at the other end 6 b of the second link member 6 instead of the other end 4 b of the first link member 4, or at an appropriate position of the lower boom 1 instead of the upper boom 2. May be.
[0026]
Further, a pair of bending / extension mechanisms B and guide sheaves may be provided across the boom.
[0027]
Further, the main bending boom A has been described as having one bending / extension mechanism B, but a plurality of bending / extension mechanisms B may be provided, and it is a matter of course that a mechanism in which such a mechanism is provided on a part of the boom is included.
[0028]
And although the bending boom A was demonstrated as what was used as a boom of an aerial work vehicle or a mobile crane vehicle, of course, it may be used for a stationary type.
[0029]
Further, the detachment stop 13 of the flexible material 10 may be provided outside the first guide sheave 21 or the second guide sheave 23.
[0030]
【The invention's effect】
The flexible material guide device used for the bending boom of the present invention constructed and operated as described above has an angle with respect to the line 1c parallel to the boom axis of the lower boom 1 so that the flexible material 10 varies depending on the degree of bending of the upper boom 2. The amount of change of θ1 and the angle θ2 of the flexible material 10 with respect to the line 2c parallel to the boom axis of the upper boom 2 can be made as small as possible. Therefore, even if the fixed joint 13 is used for the joint of the upper connection port 12 or the lower connection port 11, the flexible member 10 is not damaged, and the upper connection port 12, the lower connection port 11, and the joint can be freely arranged. The effect is great because the degree of handling, ease of handling and cost are improved.
[Brief description of the drawings]
FIG. 1 is an explanatory view illustrating a guide device for a flexible material used for a bending boom according to the present invention.
FIG. 2 is an explanatory view showing a state of the bending / extending part in FIG. 1 at the storage position;
FIG. 3 is an explanatory diagram showing a state of the bending / extending part in FIG. 1 at the extended position;
FIG. 4 is a guide member for a flexible material used in a conventional bending boom.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower boom 2 Upper boom 4 1st link member 6 2nd link member 9 Bending and extending cylinder
10 Flexible material
11 Bottom connection port
12 Upper connection port
21 First Guide Sheave
23 Second Guide Sheave

Claims (1)

The lower boom 1 and the lower end of the lower boom 1 are pivotally connected 3 to the lower side of the lower boom 1 so that the lower side of the lower end of the lower boom 1 is pivotally connected to the inner side when bent. The upper boom 2 that can be bent between the retracted position and the extended position where the distal end portion 2b is brought close, and the rear side of the distal end portion 1b of the lower boom 1, that is, the outer side when folded. A first link member 4 having one end 4a pivotably connected thereto 5 and a rear end of the base end portion 2a of the upper boom 2, one end 6a pivotably connected 7 and the other end 6b connected to the second end 6b. A second link member 6 pivotally connected 8 to the other end 4b of the link member 4 so as to be swingable on the ventral side of the upper boom 2, and the other end 4b of the first link member 4 or the other end of the second link member 6. 6b and an expandable / contractible cylinder 9 interposed between appropriate positions of the upper boom 2 or the lower boom 1 And a bending boom A comprising a flexible member 10 connected between a lower connection port 11 located on a side surface of the lower boom 1 and an upper connection port 12 located on a side surface of the upper boom 2,
Outside the swing surface of the first link member 4, outside the swing surface of the second link member 6, the first guide sheave 21 pivotally connected 22 to the first link member 4. A second guide sheave 23 pivotally connected to the second link member 6 is provided, and the flexible member 10 is connected to the first guide sheave 21 and the second guide sheave 23 from the lower connection port 11. A flexible material guide device used for a bending boom characterized by being connected to the upper connection port 12 after passing.

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