JPS63716Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a bucket for carrying a worker on the tip of a main boom attached to a vehicle so that it can be raised and turned freely, and for carrying out lifting work. This invention relates to an aerial work vehicle with a sub-boom equipped with a sub-boom.

(Prior Art) In conventional aerial work vehicles of this type with a sub-boom, it has been customary for only the bucket to be freely rotatable and the sub-boom to be in a fixed position. For this reason, when turning the bucket cart, the relative position of the bucket cart and the sub-boom in the turning direction always changes, regardless of whether there is a request or not. There was a problem with this aspect.

Against this background, the operating modes of the bucket cart and sub-boom, which are attached to the tip side of the main boom, have been divided into two modes: the first mode in which only the bucket cart rotates depending on the work conditions, and the second mode in which the bucket cart and sub-boom rotate integrally. A method has already been proposed in which it is possible to arbitrarily select between the two aspects of
-Refer to Publication No. 3289).

As shown in FIG. 5, this known example of an aerial work vehicle with a sub-boom has a support bracket 66 for a bucket 62 and a sub-boom 6 at the tip of a main boom 61.
3 support base 67 is attached around the same pivot axis 64 provided on the main boom 61 side, and an appropriate pivot mechanism 65 is disposed between the bucket tote 62 and the pivot axis 64. 62
A connecting pin 68 is installed between the bucket 62 and the support 67 to selectively connect them, and when the rotating mechanism 65 is operated with the bucket 62 and the support 67 connected by the connecting pin 68, the bucket 62 and the support 67 are connected. 62 and the sub-boom 63 rotate together, whereas when the rotating mechanism 65 is operated with the connecting pin 68 removed, only the bucket 62 rotates independently, thereby improving work efficiency. We are trying to

However, in this known example of an aerial work vehicle with a sub-boom, the winch 7 used for lifting work is
0 is fixedly placed on the sub-boom 63 side,
There is no problem when lifting a load using the sub-boom 63, but when the sub-boom 63 is not used for lifting a load, the winch 70 gets in the way of the work, restricting the work space and reducing work efficiency. A new problem will arise in this respect.

One possible solution to this problem is to place the winch 70 below the upper edge of the bucket 62, but in this case, the winch 70 can be positioned from where the sub-boom 63 rotates. If the placement position is not appropriate, the effective length of the wire rope pulled out from the winch 70 to the tip of the sub-boom will change as the sub-boom 63 rotates, causing it to be unnecessarily tensed or loosened, making it difficult to lift using the sub-boom. There is a risk that another problem may occur, such as loss of workability during cargo handling, but the reality is that no technology based on this perspective and intended to prevent this has yet been developed.

(Purpose of the invention) The present invention is an attempt to solve the problems pointed out in the prior art section above.
In an aerial work vehicle with a sub-boom, which is equipped with a bucket and a sub-boom, and can carry out specified lifting operations using the sub-boom and the winch's wire rope stretched over the sub-boom, the winch is attached to the sub-boom as the sub-boom turns. This was done with the purpose of preventing unnecessary tension or relaxation of the wire rope and improving work efficiency during load lifting work.

(Means for Achieving the Object) As a means for achieving the above object, the present invention provides a bucket attachment that is attached to the tip of the main boom so that it always maintains a constant posture regardless of the up-and-down movement of the main boom. At the same time, attach a cylindrical sub-boom support base to the bucket mount with its axis facing vertically, and then attach a sub-boom for lifting work to the sub-boom support base from above. is mounted so as to be able to rotate around the axis of the sub-boom support base, and a winch for lifting the load is provided outside the bucket and below the upper edge of the bucket, and a wire is paid out from the winch. The rope is drawn out from below the sub-boom support base through the axial center of the sub-boom support base to the tip side of the sub-boom.

(Function) In the present invention, by the means described above, the wire rope paid out from the winch is pulled out to the sub-boom side via the shaft center of the bucket attachment, which functions as the pivot axis of the sub-boom, so that the sub-boom can rotate. said sub-boom and said main boom,
That is, even if the relative position with the win device changes, the effective length of the wire rope stretched between the two remains unchanged, and unnecessary tension or relaxation of the wire rope due to the rotation of the sub-boom is ensured. The effect of preventing this is obtained.

(Example) Hereinafter, the sub-boom rotation device of the aerial work vehicle of the present invention will be explained based on the embodiment shown in Figs. 1 to 4. Fig. 1 shows the sub-boom rotation device according to the embodiment of the present invention An aerial work vehicle Z is shown equipped with equipment. This aerial work vehicle Z is vehicle 1
A telescoping main boom 3 that can be lifted up by an elevation cylinder 4 is attached to a swivel base 2 mounted on a swivel base 2, and a bucket truck is attached to a boom head 5 fixed to the tip 3a of the main boom 3 for carrying a worker on the tower. Equipment A and lifting equipment B for carrying out lifting work
and are attached via a bucket mount 6.

The bucket attachment 6 has a cylindrical support shaft 14 with flanges, which has flanges 33 and 34 formed at both ends thereof, respectively.
(In this embodiment, this support shaft 14 corresponds to the sub-boom support base in the claims of the utility model registration.) The support shaft 14 is fixed to the lower end side, and the intermediate portion thereof is connected to the boom head 5 by a support pin 13. It has a lever member 15 pivotally attached to one end of the
It is designed to be able to rotate vertically about the fulcrum pin 13. This support shaft 14 serves as a support portion for rotatably supporting a bucket support member 10 of a bucket truck device A and a sub-boom support column 9 of a lifting device B, which will be described later. Further, this bucket attachment 6 is arranged between the boom tip side cylinder 35 which is arranged between the lower end 15a of the lever member 15 and the boom head 5, the base end of the main boom 3 and the swivel base 2. The attitude of the main boom 3 is controlled by the boom proximal cylinder 36 (FIG. 1) so that the axis of the support shaft 14 is always oriented in the vertical direction, regardless of the elevation angle of the main boom 3. That is, the pair of cylinders 35 and 36 are communicated by an oil pipe (not shown), and when the depression angle of the main boom 3 increases and the boom base end cylinder 36 is extended, the boom base An amount of hydraulic oil corresponding to the extension of the end cylinder 36 flows from the boom tip cylinder 35 side to the boom base end cylinder 36 side, and the boom tip cylinder 35 contracts, causing the support shaft 14 of the bucket mount 6 to move. It is designed to be held vertically.

The bucket device A is the support shaft 1 of the bucket fixture 6.
The arm of the bucket support member 10 is made up of a cylindrical portion 11 that is loosely fitted to the outside of the bucket support shaft 14 so as to be able to rotate relative to the support shaft 14, and an arm member 12 that projects outward from the cylindrical portion 11. In addition to attaching the bucket tote 7 to the member 12, a swing cylinder 20 serving as a swing drive device for rotating the bucket tot 7 is provided between the arm member 12 and a protruding piece 26 protruding from the upper collar portion 33 of the support shaft 14. As the rotating cinder 20 expands and contracts, the bucket belt 7 together with the bucket support member 10 can be rotated by an appropriate angle θ (see FIG. 3) in a horizontal plane about the support shaft 14. It is becoming possible to do this.

The load lifting device B is constructed by attaching a sub-boom 8 of an appropriate length to a sub-boom column 9 attached to the upper end of a support shaft 14 of a bucket attachment 6, and attaching a winch 40 to the boom head 5. This sub-boom strut 9 has a bracket 18 for coupling the bracket 19 of the sub-boom 8 on the upper surface side of the flange 16, and a suitably long length having an outer diameter slightly smaller than the inner diameter of the support shaft 14 on the lower surface side. The cylinders 17 are each integrally formed, and the cylinders 17 are inserted into the support shaft 14 from the upper end side of the support shaft 14, and the flange 16 is brought into contact with the upper collar portion 33 of the support shaft 14. There is. Therefore, this sub-boom strut 9 can be rotated integrally with the sub-boom 8 about the axis of the support shaft 14 as appropriate.

In addition, in order to restrict the free rotation of the sub-boom 8, the flange 16 of the sub-boom strut 9 has an inner pin receiving hole 28 that overlaps with a pin receiving hole 29 formed in the upper brim portion 33 of the support shaft 14, and the bucket support An outer pin receiving hole 31 is formed which overlaps with a pin receiving hole 32 formed in a projecting piece 37 protruding from the cylindrical portion 11 of the member 10. Therefore, as shown in FIGS. 2 and 3, the outer pin receiving hole 31 of the flange 16 and the pin receiving hole 32 formed on the side of the bucket support member 10 are connected to the connecting pin (a connecting member within the scope of the claims for utility model registration). 30, the sub-boom 8 can rotate integrally with the bucket belt 7 as the rotation cylinder 20 expands and contracts. On the other hand, flange 25
The inner pin receiving hole 28 and the pin receiving hole 29 on the support shaft 14 side
When connected with the connecting pin 30 (not shown), the sub-boom 8 is integrated with the bucket attachment 6, and the support shaft 1
Turning around 4 is restricted.

Further, the sub-boom 8 is designed to be able to rotate vertically around a connecting pin 22 between the sub-boom 8 and the sub-boom strut 9, and a fixing pin 23 provided on the side of the sub-boom strut 9 is connected to the bracket of the sub-boom 8. Pin receiving holes 24, 24... formed in 19
The position is maintained at a predetermined elevation angle by selectively inserting it into the holder.

On the other hand, the winch 40 used for lifting work is
It is attached to the tip 3a of the main boom 3. Wire rope 4 let out from this winch 40
The wire rope 46 is guided to the tip end 8a of the sub-boom 8 and suspended downward from a tip sheave 44 provided at the tip end 8a. is guided from the main boom 3 side to the sub-boom 8 side through the axial center of the support shaft 14 of the bucket attachment 6.
That is, the lower sheave 41 disposed below the support shaft 14 of the bucket attachment 6 and the upper sheave 42 disposed above the support shaft 14 have a common external tangent line on the boom tip side as described above. Axial center L of support shaft 14
The placement position is set so that it almost matches the . Therefore, the wire rope 46 let out from the winch 40 provided on the side of the main boom 3 is passed through the lower sheave 41 and the upper sheave 42 to the proximal sheave 43 provided at the tip 8a of the sub-boom 8. By turning and further guiding from the proximal sheave 43 to the distal sheave 44,
The wire rope 46 is stretched along the axis of the bucket mount 6, that is, the center of rotation of the sub-boom 8. Therefore, even if the sub-boom 8 turns, the effective length of the wire rope 46 stretched between the sub-boom 8 and the winch 40 remains unchanged. Unnecessary tension or relaxation will be prevented. This means that as long as the winch 40 is in a stopped state, the vertical position of the hook 47 provided at the tip of the wire rope 46 is always maintained at a constant height regardless of whether the sub-boom 8 turns. The workability of the load lifting operation using the sub-boom 8 is improved to the extent that there is no necessary vertical displacement of the suspended load.

Next, we will briefly explain how to operate this sub-boom 8 when it is attached to the tip of the main boom 3. When the scope of work is wide and the work does not require much fine adjustment of the suspended load position, or when the sub-boom 8 is attached and other work is performed without lifting the load, connect the connecting pin 30. It is inserted into the inner pin receiving hole 28 of the sub-boom strut 9 and the pin receiving hole 29 on the support shaft 14 side. In this way, the sub-boom 8 is integrated with the main boom 3, and can be rotated together with the main boom 3 around the center of rotation of the swivel base 2 only when the main boom 3 is rotated. However, in this case, since the bucket cart 7 is designed to be able to rotate independently regardless of the operation of the sub-boom 3, the bucket cart 7 is moved from the position shown by the solid line (reference numeral 7) in FIG. 3 to the position shown by the chain line. (7'), the bucket cart 7 and the sub-boom 8 are separated horizontally, and the sub-boom 8 no longer gets in the way of the worker working inside the bucket cart 7, improving the work efficiency. will improve.

Furthermore, in this case, since the winch 40 is provided not on the sub-boom 8 side but on the main boom 3 side away from the bucket 7, the work space is not restricted by the winch 40, making it easier to work. This is advantageous in terms of securing space. In this embodiment, the winch 40 is provided on the side of the main boom 3, but the present invention is not limited thereto, and is provided at least outside the bucket 7 and at a position below the upper edge of the bucket 7. Just place it.

On the other hand, if the work area is relatively small and the work requires fine adjustment of the position of the suspended load, connect the connecting pin 30 to the sub-boom support 9.
The sub-boom 8 and the bucket support member 10 are connected by fitting into the outer pin receiving hole 31 of the sub-boom 8 and the pin receiving hole 32 on the bucket support member 10 side. In this way, the sub-boom 8 is integrated with the bucket belt 7, and is rotated together with the bucket trunk 7 at a small turning radius around the support shaft 14 by the expansion and contraction operation of the swing cylinder 20. Therefore, depending on the position of the suspended load, if the sub-boom 8 is rotated by an angle θ about the support shaft 14 from the position indicated by the chain line 8 in FIG. 3 to the position indicated by the chain line 8' in FIG. Since the sub-boom 8 can be rotated integrally with the sub-boom 8 without changing the relative positional relationship between the sub-boom 8 and the sub-boom 8, the position and working status of the suspended load can be easily confirmed from inside the bucket 7, improving work efficiency and safety. .

In addition, since the sub-boom 8 can be rotated with a small turning radius around the support shaft 14, the swivel base 2
The suspended load can be more easily positioned at a predetermined position than when turning with a large turning radius around the center, and the operability and workability are greatly improved.

In addition to the above-mentioned embodiment, the sub-boom rotating device of the present invention also includes a bucket attachment 6 as shown in FIG.
The support shaft 14 is formed of a cylindrical body having an appropriate inner diameter, and the cylindrical body 11 of the bucket support member 10 is sandwiched between the support shaft 14 and the support part 14, and is formed into a long length. The cylindrical body 17 of the sub-boom support 9 may be fitted so that the cylindrical body 17 also serves as the pivot shaft of the bucket cart 7. Also in this case, the sub-boom turning cylinder 20 is attached to the bucket attachment 6
and the bucket support member 10.
Also, by replacing the pin 30, the sub-boom support 9 can be attached to the bucket support member 10 side via the protruding piece 50.
Alternatively, it can be selectively connected to the bucket attachment 6 side via the projecting piece 51.

In each of the above embodiments, the bucket 7 is connected to the tip 3a of the main boom 3 via the bucket attachment 6.
Although it is installed in such a way that it can be moved up and down and rotated freely,
The present invention is not limited to this, and can of course be applied to, for example, a structure in which the bucket 7 is attached to the main boom tip 3a so as to be movable up and down and not rotated.

(Effects of the invention) The aerial work vehicle with a sub-boom of the present invention has a bucket mount attached to the tip of the main boom so as to always maintain a constant posture regardless of the up-and-down movements of the main boom, and A cylindrical sub-boom support base is attached to the tool with its axis facing vertically, and a sub-boom for lifting a load is attached to the sub-boom support base from above. At the same time, a winch for lifting the load is provided outside the bucket and below the upper edge of the bucket, and the wire rope let out from the winch is connected to the sub-boom support base. It is characterized in that the sub-boom is pulled out from below the stand through the axial center of the sub-boom support base to the tip side of the sub-boom.

Therefore, according to the aerial work vehicle with a sub-boom of the present invention, the wire rope let out from the winch is pulled out to the sub-boom side via the axial center of the support base which functions as the pivot axis of the sub-boom. Even if the sub-boom turns and the relative position of the sub-boom and the main boom, that is, the win device, changes, the effective length of the wire rope stretched between them remains unchanged. Unnecessary tension or relaxation of the accompanying wire rope is reliably prevented, and the practical effect of further improving the workability when lifting a load using the sub-boom can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an overall view of an aerial work vehicle with a sub-boom according to an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of a portion of Fig. 1, Fig. 3 is a view taken in the - arrow direction of Fig. 2, and Fig. 4 The figure is a side view of the tip of a sub-boom-equipped aerial work vehicle according to another embodiment of the present invention, and FIG. 5 is a structural explanatory diagram of a conventional aerial work vehicle. 3...Main boom, 3a...Main boom tip, 6...
...Bucket mounting fixture, 7...Bucket, 8...Subboom, 9...Subboom support member, 10...Bucket support member, 14...Spindle (subboom support base), 20...Swivel drive device, 30... ...Connecting member, 40...Winch, 46...Wire rope.

Claims (1)

[Scope of utility model registration request] A bucket mount 6 is attached to the tip 3a of the main boom 3 so that it always maintains a constant posture regardless of the up-and-down movements of the main boom 3, and its axis is aligned vertically with respect to the bucket mount 6. A cylindrical sub-boom support base 14 facing
Further, a sub-boom 8 for lifting a load is attached to the sub-boom support base 14 from above so as to be rotatable around the axis of the sub-boom support base 14, and a winch 40 for lifting the load is attached.
The winch 4 is provided outside the bucket 7 and at a position below the upper edge of the bucket 7.
With a sub-boom, a wire rope 46 let out from the sub-boom support base 14 is pulled out from below the sub-boom support base 14 through the axial center of the sub-boom support base 14 to the tip 8a side of the sub-boom 8. Aerial work vehicle.