JPH0218074Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an aerial work vehicle equipped with a foldable boom.

(Prior art) Aerial work vehicles are broadly divided into two types depending on the type of support device for the bucket.One is a telescopic boom type aerial work vehicle with a bucket attached to the tip of a telescoping boom, and the other is is a folding boom type aerial work vehicle with a bucket attached to the tip of the folding boom.

By the way, of these two aerial work vehicles, the biggest advantage of the folding boom type aerial work vehicle is that the bucket can always be maintained in a horizontal position regardless of the undulations (bending angle) of the boom. As the leveling mechanism, a wire type leveling mechanism, which has a simple structure and is inexpensive, can be applied.

On the other hand, in terms of the working range, the telescopic boom type aerial work vehicle is more advantageous than the folding boom type aerial work vehicle. In other words, in the case of a telescoping boom type aerial work vehicle, by increasing the number of stages of the telescoping boom, its fully retracted length (i.e., retracted length) can be reduced.
It is possible to easily expand the work range without increasing the work area, but in the case of a folding boom type aerial work vehicle, if you try to expand the work range,
Either of two methods must be taken: increasing the length of the boom (that is, the length when stored) or increasing the number of bending stages by increasing the number of booms.
However, when attempting to expand the working range of a folding boom type aerial work vehicle by increasing the length of the boom, there is a limit to the maximum amount that the boom can protrude from the vehicle when the vehicle is running (i.e., the boom cannot be extended beyond the vehicle). There is a limit to extending it towards the rear of the vehicle as it will reduce the loading space, and extending it towards the front of the vehicle has a limit in terms of vehicle driving safety), and using multiple booms (3 or 4) for bending. When increasing the number of stages and thereby expanding the working range, the greater the number of booms, the higher the overall height, and therefore, even in this case, there is a limit because the overall height of the vehicle is regulated when the vehicle is running. From these points, the telescopic boom type aerial work vehicle is the mainstream as the aerial work vehicle used for work that requires a large working range, and therefore, the above-mentioned folding boom type aerial work vehicle is unique. However, it is possible to install an inexpensive leveling mechanism, which results in high manufacturing costs.

(Purpose of the invention) The present invention is an attempt to solve the problems pointed out in the above section of the prior art. , which is equipped with a folding boom that expands the working range without increasing the vehicle height or vehicle length when the boom is retracted, and also prevents damage to the bucket when retracting and extending the boom. The purpose of this project is to provide a work vehicle for people working in the field.

(Means for Achieving the Object) As a means for achieving the above object, the present invention has a swivel base mounted on the chassis frame of a vehicle, and is connected to the swivel base in a vertically movable manner. A foldable boom is mounted, which has a base boom and a top boom that is connected to the tip of the base boom so as to be bendable in the vertical direction and has a bucket for riding on the worker attached to the tip of the top boom, and the base boom and the top boom are The base boom and the top boom can be folded into two in the horizontal direction orthogonal to the undulation or bending direction at intermediate positions in the longitudinal direction, and in the working position, the base boom and the top boom are connected by extending in a straight line. It is configured so that it can be fixed, and when stored, it can be folded into two and fixed.

(Function) According to the present invention, the base boom and the top boom, which are foldably connected in the vertical direction, can be folded in the undulation or bending direction at an intermediate position in the longitudinal direction, so that By setting the vehicle height and vehicle length within legally regulated dimensions, the boom length can be doubled during work, and the folding boom type height has a simple structure and can be equipped with an inexpensive leveling mechanism. Although it is a platform work vehicle, it has a work range similar to that of a telescopic boom type aerial work vehicle.

Furthermore, in such a folding boom, since the bucket is attached to the tip of the top boom, folding and extending operations of the boom can be performed with the bucket stored at the proximal end of the base boom. This prevents damage caused by interference with other parts of the bucket when the boom is folded or extended.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 5.

(Structure) FIGS. 1 to 4 show a folding boom type aerial work vehicle Z according to an embodiment of the present invention. This aerial work vehicle Z has a folding type, which will be described in detail later, on the upper end of a swivel platform 4 that is attached to the chassis frame 1a of the vehicle 1 via a base 60 (with a jacking device 62) and a swivel bearing 61. Install the boom 9 so that it can rise and fall freely,
Further, a bucket 5 for carrying a worker is attached to the tip 9a of the foldable boom 9.

The foldable boom 9 has its base end 10b connected to the swivel base 4 by a fulcrum pin 30 so as to be able to freely raise and lower in the vertical direction, and is connected to the fulcrum pin 30 by a levitating cylinder 6 disposed between the swivel base 4 and the swivel base 4. A base boom 10 that can be raised and lowered in the vertical direction with the base boom 10 as a center, and a base end 20b thereof is connected to the tip 10a of the base boom 10 so as to be bendable in the vertical direction by a first connecting pin 31, and the tip 20a of the base boom 10 is Bucket 5 via bucket support shaft 34
It has a top boom 20 with a top boom 20 attached thereto.

Furthermore, the base boom 1 of this foldable boom 9
0 and the top boom 20 can be folded into two laterally from their axially intermediate positions. That is, the base boom 10 has two parts: a proximal piece 11 located at its base end and a distal piece 12 located at its distal end, and the top boom 20 has a proximal piece 11 located at its proximal end. 2 of the piece 21 and the tip side piece 22 located on the tip side
Each is divided into two parts. Also, each piece 11, 12 of each boom 10, 20, same 2
1 and 22 are a pair of left and right connecting pins 32A, 32B and 33A, 33B provided at the connecting portion, respectively.
The base boom can be rotated laterally around one of the connecting pins 32A and 33A (see Figure 2), and in its retracted state, the base boom The top boom 20 is folded in half so that the 10 distal pieces 12 are along the sides of the proximal piece 11, and the distal piece 22 of the top boom 20 is along the sides of the proximal piece 21, and then fixed appropriately. It is fixed by a device (not shown) (at the time of storage). On the other hand, during work, the proximal end piece 11 and the distal end piece 12 of the base boom 10 and the base of the top boom 20 are shown as shown by the chain line in FIG. The end piece 21 and the tip piece 22 are arranged to extend linearly, respectively, and constitute the base boom 10 and the top boom 20, respectively (posture during operation). The postures of the base boom 10 and the top boom 20 are changed by attaching and detaching the connecting pins 32B and 33B on the side opposite to the fulcrum of the pair of connecting pins 32A, 32B and 33A, 33B.

Also, the base end 12a of the tip side piece 12 of the base boom 10 and the base end side piece 2 of the top boom 20
A bending cylinder 7 is attached between the base end portions 21a of the boom 1, and the bending angle between the base boom 10 and the top boom 20 is adjusted by expanding and contracting the bending cylinder 7.

Incidentally, the vertical movement of the bucket bag 5 is performed by both the bending angle adjustment by the bending cylinder 7 and the undulation angle adjustment by the undulation cylinder 6. In this way, when the tip of the folding boom 9, that is, the tip 20a of the top boom 20 moves in the vertical direction due to the up-and-down and bending of the folding boom 9, the relative position of the folding boom 9 and the bucket 5 naturally changes. Therefore, a leveling mechanism A, which will be described later, is incorporated into the folding boom 9 in order to maintain the bucket cart 5 in a horizontal position at all times regardless of changes in the relative positional relationship between the two.

Hereinafter, the leveling mechanism A will be explained based on the wire structure diagram shown in FIG. 5 (a simplified diagram of the actual mechanism).

This leveling mechanism A is a wire-type leveling mechanism, and has two wire ropes, namely,
First wire rope 51 and second wire rope 5
2, and the first connection that connects the base boom 10 and the base boom 20 with a pair of first sheaves 41A and 41B attached to the fulcrum pin 30 that connects the swivel base 4 and the base end piece 11 of the base boom 10. A pair of second sheaves 42A, 4 attached to the pin 31
2B, a pair of third sheaves 43A and 43B attached to the second connecting pin 32 on the fulcrum side that pivotally connects the proximal end piece 11 and the distal end piece 12 of the base boom 10, and the top boom 20. A pair of fourth sheaves 44A, 44B are attached to the third connecting pin 33 on the fulcrum side that pivotally connects the proximal end boom 21 and the distal end boom 22, and the first wire is attached to the bucket support shaft 34. A sprocket 46 around which a chain 53 connecting one end of the rope 51 and one end of the second wire rope 52 is wound, and a turn sheave 4 for changing the drawing direction of the wire rope arranged between the sheaves.
It is composed of 5, 45, and so on. In addition, each pair of sheaves 41A, 41B, 42A, 42B,
Among the wire ropes 43A, 43B, 44A, and 44B, one sheave of each pair, that is, the first sheave 41A, the second sheave 42A, the third sheave 43A, and the fourth sheave 44A are dedicated sheaves for the first wire rope 51. , and the other sheave, that is, the first sheave 41B
The second sheave 42B, the third sheave 43B, and the fourth sheave 44B are dedicated sheaves for the second wire rope 52.

Of the pair of wire ropes 51 and 52,
Wiring of the first wire rope 51 is performed as follows. That is, as shown by the solid line in FIG. 5, one end 5 of the first wire rope 51
1a is fixed to the cable end stopper 36 provided on the swivel base 4, the rear end 51b is wrapped once around the first sheave 41A from the boom tip side via the roll bar 53 for adjusting the wrapping angle, and then the lower surface is The proximal piece 1 is pulled out from the side through the turn sheave 45 to the second sheave 43A side, and then the base end piece 1 is pulled out to the second sheave 43A side through the turn sheave 45.
After being wound once from the first side, it is wound once from the bottom side of the second sheave 42A via the turn sheave 45, pulled out upward, and taken out to the top boom 20 side. Furthermore, the base end piece 2 of the top boom 20
After winding it around the fourth sheave 44A from the side closer to the tip side piece 22 through the two turn sheaves 45, 45 provided in the turn sheave 45, it is further pulled out to the tip side of the tip side piece 22 through the turn sheave 45, and here the The other end 51b is connected to one end 53a of the chain 53.
Connect to.

On the other hand, wiring of the second wire rope 52 is performed as follows. That is, after fixing one end 52a of the second wire rope 52 to the cable end stopper 37 provided on the swivel base 4, the other end 52b is wound once around the first sheave 41B from the rear side of the boom via the roll bar 35. , pull it out from the upper surface side through the turn sheave 45 to the third sheave 43B side, and further insert the tip side piece 1 into the third sheave 43B.
After being wound once from the second side, the second sheave 42B is wound once from the upper surface side of the second sheave 42B via the turn sheave 45, and taken out to the top boom 20 side. Further, the top boom 20 is wound once from the proximal piece 21 side to the fourth sheave 44B via the two turn sheaves 45, 45 provided on the proximal piece 21 of the top boom 20, and then passed through the turn sheave 45 to the distal piece 22.
The other end 51b is directly connected to the other end 53b of the chain 53.

When the bucket 5 is fixed to the bucket support shaft 34 with the wire ropes 51 and 52 wrapped around it in such a manner that its upper surface 5a is substantially horizontal, the angle of elevation and bending of the folding boom 9 can be determined. No matter how the angle changes, the bucket 5 is always maintained in the above-mentioned set posture, and is not moved and maintains the same posture even if the base boom 10 and top boom 20 are bent sideways.

(: Operation and Effect) Next, the operation and effect when performing work at height using this aerial work vehicle will be briefly explained.

As shown in solid lines in FIG. 1, when the aerial work vehicle Z is in its retracted position, the bent portions of the base boom 10 and top boom 20 of the foldable boom 9 are moved a small distance forward of the driver's cab 3 of the vehicle 1. It is fixed in the protruding state.

During the work, first, the tip end piece 12 of the base boom 10 and the proximal end piece 2 of the top boom 20 of the foldable boom 9 in the retracted position as described above are removed.
1 and 2 to the side of the vehicle manually.
As shown by the chain lines in the figure, the base boom 10 is rotated toward the front of the vehicle around the second connecting pin 32A and the third connecting pin 33A, and the base end piece 11 and the tip end piece 12 of the base boom 10 and the base end side piece 21 of the top boom 20 are rotated toward the front side of the vehicle. and the tip side piece 22 both extend linearly, and the connecting pin 32 on the side opposite to the fulcrum
Attach and fix B and 33B (state shown in solid line in FIG. 4). The work preparation is now complete.

After the preparation for work is completed, the undulating cylinder 6 and the bending cylinder 7 are operated as appropriate to position the bucket 5 at a predetermined work position and perform a predetermined work.

Storing the foldable boom 9 from the working position is easily accomplished by performing a predetermined operation in the reverse order of the operating procedure at the start of the work described above. As described above, in this embodiment, the folding boom 9 can be extended from the stored state (and vice versa) without moving the bucket 5. Therefore, even if the bucket 5 has a relatively large shape at the tip of the top boom 20, it is possible to prevent the bucket 5 from interfering with other members and being damaged when the boom 9 is extended. This is something that can definitely be prevented.

The above series of operations is performed on the vehicle 1 side and the bucket 5 side.
This is done using operating devices (not shown) provided on both sides.

When the aerial work vehicle Z is in its operating position, a part of the folding boom 9 extends greatly in front of the vehicle 1, as shown in FIG. However, in the storage position in which the vehicle 1 is folded in two at the intermediate portion, the amount of forward protrusion of the vehicle 1 is almost eliminated as shown in FIG. 1, and the vehicle 1 can be easily accommodated within the specified maximum protrusion dimension.
This allows the lengths of the base boom and top boom to be substantially longer compared to a single-stage folding boom of conventional structure that also has a base boom and a top boom but does not have a boom side-folding function ( In other words, a foldable boom with a longer boom length can be mounted, which means that the work range is expanded accordingly and the work efficiency is improved.

Furthermore, although this foldable boom 9 is constructed so that it can be folded not only vertically but also horizontally into a two-fold shape from an intermediate position, its basic configuration is different from that of the conventional folding type. It is the same as a boom (without horizontal folding function), and therefore, as mentioned above, it is possible to apply a wire rope leveling mechanism which has a simple structure and is inexpensive, and its performance can be improved by adding a horizontal folding function. Despite efforts to increase costs, it is possible to keep the cost increase relatively small.

Furthermore, by folding the folding boom 9 into two horizontally from the middle part, the vehicle height as the aerial work vehicle Z can be avoided (in other words, the height of the aerial work vehicle Z can be increased without increasing the height). The working range can be expanded (while maintaining the vehicle height of the work vehicle), so for example, if the folding boom is made into a multi-stage folding type and the number of booms is increased, the working range can be expanded. This is advantageous in terms of structure compared to the case where the vehicle height increases as the number of bending steps increases.

Incidentally, the vehicle-mounted crane vehicle has a base (equipped with a jacking device) integrally connected to the chassis frame of the vehicle, similar to the aerial work vehicle of the illustrated embodiment, and
A swing bearing is provided on this base. A crane unit mounted on a vehicle is constructed by integrally connecting a crane portion to this swing bearing via a bolt.

This crane section is equipped with a boom extension/retraction actuator, a boom hoisting actuator, and a winch drive actuator.
In order to drive these actuators, piping is connected from the hydraulic pump and tank to the actuators via a rotary joint. Therefore, when converting this vehicle-mounted crane truck to an aerial work vehicle, the piping between the hydraulic pump and tank and the rotary joint can be used as is for the boom bending and extension cylinder of the aerial work vehicle. It can be used as it is as a part of the piping to the boom hoisting cylinder, and the control valves of the boom telescoping actuator, the boom hoisting actuator, and the winch drive actuator located in the middle of each of these pipings can be used as they are in the boom bending and elongating cylinder. It can be used as a control valve for boom hoisting cylinders, making it extremely easy to transfer work between aerial work vehicles and vehicle-mounted crane vehicles.

Furthermore, it goes without saying that the foldable boom of the aerial work vehicle of the illustrated embodiment can be used as is as a boom of a vehicle-mounted crane vehicle.

(Effect of the invention) The aerial work vehicle of the present invention has a swivel base mounted on the chassis frame of the vehicle, a base boom that is connected to the swivel base so as to be able to rise and fall freely in the vertical direction, and a base boom that is connected to the tip of the base boom. A foldable boom is mounted on the top boom, which is connected so as to be bendable in the vertical direction, and has a top boom equipped with a bucket for riding a worker at its tip, and the base boom and the top boom are respectively placed at intermediate positions in the longitudinal direction. It can be folded into two in the horizontal direction perpendicular to the undulation or bending direction, and when in the working position, the base boom and top boom are connected and fixed in a straight line, and when stored, they can be folded into two. It is constructed so that it can be folded horizontally into a shape and fixed.

Therefore, according to the aerial work vehicle of the present invention, if the length of the folding boom that protrudes outside the vehicle body during storage is fixed, the conventional folding boom that does not have a horizontal folding function can be It is possible to install a foldable boom with a longer boom length than that of an aerial work vehicle with a built-in aerial work platform, which expands the work range accordingly.
The practical effect of improving the work performance of an aerial work vehicle can be obtained.

Furthermore, according to the aerial work vehicle of the present invention, the boom can be folded and extended without moving the bucket, and damage caused by interference with other parts of the bucket can be prevented. It also has the effect of improving the durability of the device and the safety of the work.

[Brief explanation of the drawing]

FIG. 1 is a side view of the aerial work vehicle according to the embodiment of the present invention, FIG. FIG. 5 is a conceptual diagram of a leveling mechanism installed in the aerial work vehicle shown in FIG. 1. 1... Vehicle, 2... Loading platform, 5... Bucket, 9
...Foldable boom, 10...Base boom, 20
... Top boom.

Claims (1)

[Scope of utility model registration request] A swivel base 8 is mounted on the chassis frame 1a of the vehicle 1, and a base boom 10 is connected to the swivel base 8 so that it can be raised and lowered in the vertical direction, and a tip 10a of the base boom 10 can be bent in the vertical direction. A foldable boom 9 is mounted, which has a top boom 20 that is connected to a top boom 20 and has a bucket 5 attached to its tip 20a for riding a worker. The base boom 10 and the top boom 20 can be folded in half in the horizontal direction perpendicular to the undulation or bending direction, and when in the working position, the base boom 10 and the top boom 20 are connected and fixed in a straight line, and when stored, they can be folded in two. An aerial work vehicle characterized by being configured so that it can be folded into a trifold shape and fixed.