JPH061592A - Bending type height working vehicle - Google Patents

Abstract

PURPOSE:To revolve safely even in a narrow place by forming the length from the revolving center to the end of a swivel base, and the length from the revolving center to the end of the connection of two bending type booms, smaller than the half of the full length of a running device. CONSTITUTION:A height working vehicle 10 has a running device 20 furnishing an endless crawler, a swivel base 30 held rotatable making almost the center of the running device 20 as the fulcrum, and a bending type boom 40 installed inclinable to the swivel base 30, and a working base 60 a worker rides in is held at the tip of the boom 40. While the boom 40 is made by connecting the first boom 41 and the second boom 42 bendable through a connecting member 43, inner booms 44a... are housed to the second boom 42 in a telescopic form. In this case, the length from the revolving center CL to the end of the swivel base 30, and the length from the revolving center CL to the end P of the boom connecting member 43, are set smaller than or equal to the half of the full length of the running device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refraction type aerial work vehicle, and more particularly to a refraction type aerial work vehicle capable of turning in a narrow place.

[0002]

2. Description of the Related Art Generally, in an aerial work vehicle, a telescopic boom 81 which can be elevated and retracted is mounted on a traveling vehicle body, and a work platform 82 is attached to the tip of the telescopic boom 81 which is elevated and retracted. The workbench 82 is moved toward an aerial work station, or the vehicle body is moved to a work position at a high position so that work at a high position can be performed easily on the workbench 82 as shown in FIG. Work vehicle 80 is well known. In such an aerial work vehicle 80, the lift is set large in order to easily perform work in a higher place, and the arc radius is also set large in order to set a wide working range. At this time, in order to ensure safety such as falling prevention, at the maximum danger, that is, when the boom is lengthened (maximum length when extended) as shown in (a position) of FIG. It is necessary to ensure the stability of the horizontal. For this,
Since the fulcrum 85 and the counterweight 86 of the boom are installed at a position as rearward as possible (the swivel on the other end side of the work table) of the swivel base 87 on the side opposite to the boom extending direction shown in FIG. 85 and the counterweight 86 are out of the width (L) of the traveling device of the vehicle body when turning. Also,
It is also known that a refraction boom is mounted on an automobile or the like that emphasizes mobility for facilitating movement between sites in order to safely perform work at higher altitudes.

[0003]

The functions required for aerial work vehicles are to be able to work in a wider area in a higher place, to perform safe work, to be easily transported, and to be maneuverable. Is. However, in the aerial work vehicle as shown in FIG. 7, in the above, since the hoisting angle of the boom is limited to about 0 to 90 °, a predetermined distance from the turning center at the time of maximum hoisting as shown in FIG. You cannot work within the distance (W). Further, in the above description, the driver on the workbench has a blind spot behind the vehicle body (portion A in the figure), and there is a risk of catching a worker on the ground when turning or moving the vehicle body. In addition, in the case where the boom is lowered, the total length during transportation is long (Y
A), poor transportability. In addition, it is not possible to turn on a narrow road where urban buildings are built close to each other, which reduces work efficiency. In particular, in FIG. 9, when the condition of the boom is in the shortest state (when the boom is contracted) is good, the 360 ° swivel cannot be made even in the maximum undulated state, so that the work efficiency in a narrow place is reduced. Further, in the structure shown in FIG. 7, there is a problem that traffic of other automobiles or the like is obstructed on a narrow road as shown in FIG. 9 to cause traffic congestion. Further, in a vehicle equipped with a refraction boom mounted on an automobile or the like, since the connecting portion of the first boom and the second boom extends beyond the width of the traveling device, it is difficult to turn 360 ° in a narrow place. There is also the problem that work efficiency is also reduced.

The present invention has been made in view of the above problems, and relates to a refraction type aerial work vehicle, and in particular, an object thereof is to provide an improved refraction type aerial work vehicle that is safe and can turn in a narrow place. There is.

[0005]

According to a first aspect of the present invention, a traveling device, a swivel mounted on the traveling device so as to swivel about the center of the traveling device as a fulcrum, and a supine position with respect to the swivel base. In a refracting aerial work vehicle consisting of a bendable boom mounted on a free swivel and a workbench supported at the tip of the boom on which an operator rides for maneuvering or working To the end of the vehicle and the length from the center of rotation to the end of the connecting portion of the first boom and the second boom of the bending type are less than half the total width of the traveling device.

According to the second aspect of the invention, which is mainly the first aspect of the invention, the upper part of the outer shape of the swivel cover mounted on the swivel base is located inside the vehicle body at least on the side opposite to the work center with respect to the swivel center. It is formed small.

[0007]

According to the above configuration, the entire width of the traveling device (for example,
The outer width of the wheel or the outer width of the infinite track, etc.
Hereinafter referred to as the width of the traveling device. ), The end of the revolving base and the end of the connecting part of the first boom and the second boom of the refraction type are housed in the inside of the bracket), so that the revolving superstructure makes a very small swing (36
You can make a 0 ° turn. Further, since the boom can be raised or lowered at an angle of 90 ° or more by using the refraction type, it is possible to reduce a range in which work cannot be performed from the turning center at the time of maximum undulation. Especially when the boom is in the shortest state (when the boom is contracted), it is raised and lowered as it is, and when the boom is extended by a predetermined amount. Since it is possible to make a 360 ° turn inside, the work efficiency in a narrow space is significantly improved. In addition, while keeping it within the width of the traveling device, the revolving structure is rounded to reduce the blind spots when the driver looks at the ground from the workbench, and the workbench driver turns or It is not necessary to pay close attention to the safety of workers on the ground when moving. Further, the total length of the boom in a retracted state (when the boom is contracted to the maximum), that is, during transportation, is shortened, and the transportability is improved. Further, since the swivel is stored within the width of the traveling device, it is only necessary to secure a road other than the traveling device width of the aerial work vehicle so that the vehicle can pass through it. Opportunity to shut off is reduced. In addition, workability is improved because it can be easily turned even in a narrow place. With the boom raised to the maximum, the risk of the work platform falling to the opposite side of the workbench is reduced because there is less overhang such as counterweight than the vehicle body.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a side view of a first embodiment of a bending type aerial work vehicle of the present invention, and FIG. 2 is a plan view of a first embodiment of a bending type aerial work vehicle of the present invention.

In FIG. 1, an aerial work vehicle 10 includes a traveling device 20, and a swivel base 30 mounted on the traveling device 20 so as to be freely rotatable about the center of the traveling device 20 as a fulcrum (CL).
The bending boom 40 is mounted on the swivel so that it can be lifted up and down with respect to the swivel, and the workbench 60 is supported on the tip of the boom on which an operator rides for maneuvering or working. The traveling device 20 includes a lower frame 21, an endless crawler belt 22 that is rotated by an unillustrated traveling hydraulic motor mounted on the lower frame 21, and that moves the work platform 10 at high places.
The lower frame 21 includes a swivel bearing 23 that supports a swivel base 30. In FIG. 1, the portion B shows the end of the endless crawler belt 22 in the longitudinal direction (traveling direction). The present invention is endless track 2
Although 2 is used, it may be a wheel.

The swivel base 30 is composed of a swivel frame 31 supported by a swivel bearing 23 and a swivel base cover 32 (including a counterweight 32a). Is rotatably mounted in a horizontal direction with respect to a swing center (CL) which is substantially at the center of the rotation center, and a turning hydraulic motor (not shown) is actuated by a driver on the workbench to turn. Swivel 30
A boom support pin 33 for supporting the bending boom 40 with respect to the swivel base 30 is attached to the swivel base 30, and the end (Q) of the swivel base 30 where the boom support pin 33 is attached is attached. 2), the distance from the center of turning on the outside of the turntable is half the total width (L) of the vehicle body (L / L) as shown in FIG.
It is arranged to be smaller than or equal to 2).

The swivel base 30 also has a bending boom 4
Boom hydraulic cylinder 50 for lifting and lowering 0
A pin 34 that supports one end of the is also attached. Further, although not shown, the revolving base 30 includes a traveling hydraulic motor for the aerial work vehicle 10, a revolving hydraulic motor, or a hydraulic source such as a hydraulic cylinder for expanding and contracting the bending boom 40, and a switching valve, and its hydraulic pressure. The power source for driving the power source is the swivel base cover 3.
It is attached inside 2. The outer shape (M) of the swivel base cover 32 with respect to the turning center is rounded into a semicircular shape (symbol R in FIG. 2) with respect to the turning center (CL), and the traveling device width (L).
It is housed inside and is inclined (S) so that it becomes smaller at the upper part of the outer shape so that there are few blind spots when the driver looks at the ground from the workbench.

The refraction boom 40 connects the first boom 41 and the second boom part 42 to the box-shaped first boom 41 and the box-shaped second boom part 42 including a part of a U-shape. The second boom part 42 includes a connecting part 43, and the second boom part 42 further includes an inner boom 44 inside the second boom 44 having a box shape.
.., etc. are gradually inserted in multiple stages. In addition, the second boom portion 42 is connected to the first boom 41 that swings the second boom portion 42 with respect to the first boom 41 by a pin 46 and a second boom 44 by a pin 47.
The boom elevation hydraulic cylinder 48 is connected to the first boom 41 and the second boom 41.
It is arranged so as to be connected to the boom 44.

The connecting portion 43 is composed of a connecting pin 45 attached to the first boom 41 and a bush or the like (not shown) attached to the second boom portion 42, and they are pivotally connected in a swingable manner. However, the relationship between the bush and the pin may be reversed. The bendable boom 40 is configured such that one end of the boom 40 is connected to the swivel base 30 by a pin 34, and the other end is connected to the first boom 41 by a pin 49. The workbench 60 can be raised and lowered, that is, it can swing up and down to raise and lower the workbench 60. Further, the refraction type boom 40 includes the second boom elevation hydraulic cylinder 4
By the operation of No. 8, the second boom unit 4 with respect to the first boom 41
2 is rocked, and the second boom portion 42 can be raised and lowered, that is, it can be pivoted up and down to raise and lower the workbench 60.

Further, the refraction boom 40 has inner booms 44a, 44 housed inside the second boom 44.
The work table 60 is moved up and down by expanding and contracting b by the operation of a hydraulic cylinder for expansion and contraction (not shown). At this time, the first boom 41
End (P) of the connecting portion 43 that connects the second boom portion 42 with the second boom portion 42.
The distance from the turning center of the
Even if the position is moved by the operation of 0, it is arranged so as to be smaller than or equal to the full width length (L) of the traveling device.

The workbench 60 includes a control panel 61.
The control panel 61 is provided with various operation levers 62 as moving operation means. For example, although not shown, the boom 4 is attached to the various operation levers 62.
Boom depression / elevation operation lever for adjusting the depression / elevation angle of 0, telescopic operation lever for adjusting the extension / contraction amount of the inner boom 42,
A turning operation lever for adjusting the turning angle of the turning base 30, a traveling operation lever for moving the work vehicle 10 at high places, and the like are provided. Incidentally, in the above-mentioned embodiment, a worker on the workbench operates various levers to carry out work, movement, etc., but the swivel base 30 is also provided with the same one as the control panel 61, and the same. Work, movement, or turning may be performed. It may also be operated by radio control.

Next, the operation of the above structure will be described. For example, the worker approaches the endless crawler belt 22 of the aerial work vehicle 10 along the building even when performing aerial work on buildings (Ea, Eb) along the road on a narrow road (D) as shown in FIG. Let me stop. Workbench 6 at the tip of a shortened boom 40 placed on the road along a building (Ea)
The second boom boom elevation hydraulic cylinder 48 is extended to the maximum length by operating the operation lever 62 while riding on 0. At this time, since the revolving structure, the boom, and the workbench are housed within the traveling device width (L), the revolving structure can make a very small revolution (revolution within the traveling device width).
It is possible to work not only in a) but also in a high place of the opposite building (Eb).

In particular, if the aerial work vehicle 10 is stopped on the opposite side of the building (Eb) in which the work is to be carried out, after the work platform is turned in the direction of the building, the second boom portion 42 is extended and the second boom is raised. The workbench 60 is moved to a higher position (E
The desired position of c) can be easily approached, and the work efficiency in a narrow space is significantly improved. Further, at this time, since the aerial work vehicle 10 can be stopped close to the building, a passage on the opposite side can be widely secured, work can be performed on a narrow road, and a chance of interrupting traffic is reduced. At this time, when the aerial work vehicle 10 is moved or the swivel base 30 is swung, the end of the swivel base 30 is accommodated within the entire width of the endless track 22, so that the operator of the work platform is It is not necessary to pay attention to the safety of workers on the ground when turning or moving. In addition, even if you look at it carefully, you can see it easily because the external shape is inclined, and you can confirm safety quickly.

As shown in FIG. 4, the boom raising / lowering hydraulic cylinder is extended to tilt the first boom to the workbench side, and the boom telescopic cylinder (not shown) is extended (F), that is, the conventional state. When the workbench is rotated by the operation of the second boom elevation hydraulic cylinder 48 from the state where the workbench is aligned with the maximum lift position in the configuration, the work range of the hatched portion (G) shown in the figure is wider than in the conventional case. Become. Also,
In the state (J) in which the boom boom / elevation hydraulic cylinder is maximally contracted to tilt the first boom to the side opposite to the workbench and the second boom / elevation hydraulic cylinder 48 is maximally extended (J). Is extended by the operation of a boom telescopic cylinder (not shown), the hatched portion (K)
The working range of is widened. That is, it is possible to reduce the range where the work (W) in which the workbench 60 is swung cannot be performed from the turning center when the second boom is maximally raised and lowered. further,
The boom boom / elevation hydraulic cylinder is contracted to the maximum so that the first boom is tilted to the side opposite to the work table to the maximum, and the second boom elevation hydraulic cylinder 48 is contracted to the maximum, and
When the workbench is contracted by the operation of a boom telescopic cylinder (not shown) (U), that is, when the boom is lowered (when the boom is maximally contracted), the overall posture is shorter during storage and the overall length is shorter than before (Y in the figure). ), The transportability is improved.

FIG. 5 shows a second embodiment of the refracting type aerial work vehicle of the present invention.
It is a partially expanded view of the side surface of the embodiment. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 5, an aerial work vehicle 100 includes a traveling device 20 that can move,
A swivel base 130 is mounted so as to swivel about the center of the width of the traveling device 20 as a fulcrum, a bendable boom 140 is mounted on the swivel base so as to be raised and lowered with respect to the swivel base, and an operator supported by the tip of the boom. And a workbench 60 for boarding and working.

The swivel base 130 comprises a swivel frame 131 supported by a swivel bearing 23 and a swivel base cover 132. The swivel base 130 is arranged on the lower frame 21 as in the first embodiment. The unillustrated turning hydraulic motor operates to turn. A boom support pin 33 is attached to the swivel base 130 to support the bendable boom 140 so that the boom 140 can be raised and lowered with respect to the swivel base 130. The outer end of the swivel base 130 is arranged such that the distance from the swivel center is smaller than or equal to half (L / 2) of the traveling device width length (L). In addition, the swivel base 130
Is a pin 13 that supports one end of a boom-elevation hydraulic cylinder 50 that operates to freely lift the bending boom 140.
4 is also attached near the boom support pin 33.

Further, on the swivel base cover 132, a pin 135 for supporting one end of a second boom raising / lowering hydraulic cylinder 150 that operates so that the second boom portion 142 can be raised / lowered is attached near the boom support pin 33 and above. ing. Although the pin 135 is described as being mounted on the swivel base cover 132, a dedicated support base may be provided and the support base may be attached to the swivel base. Although not shown, the swivel base 130 accommodates various devices inside similarly to the first embodiment, and the swivel base 130 has a semicircular outer shape with respect to the swivel center (CL). It is rounded (R) and accommodated within the travel device width (L), and is further inclined (S) so that there are few blind spots when the driver looks at the ground from the workbench.

The bendable boom 140 has a first box-shaped shape.
A boom 141 and a second boom portion 142, a connecting portion 43 that connects the first boom 141 and the second boom portion 142,
The second boom portion 142 is composed of a link device 145 that can be lifted and lowered with respect to the first boom 141. The second boom portion 142 further includes inner booms 44a and 44b inside the box-shaped second boom 144. .. etc. are gradually inserted in multiple stages. The link device 145 has a second end whose one end is axially supported by the pin 135 on the swivel base cover 132.
The boom / elevation hydraulic cylinder 150 includes a link arm 147 and a link arm 148 that are pivotally supported by a pin 146 on the other end of the second boom / elevation hydraulic cylinder 150. The other end of the link arm 147 is the first boom. 141
Is pivotally supported by a pin 151, and the other end of the link arm 148 is pivotally supported by the second boom 144 by a pin 152.

The bendable boom 140 has a swivel base 1 at one end.
30 to the pin 134 and the other end to the first boom 141 to the pin 1
By operation of the boom / elevation hydraulic cylinder 50 connected by 49, the first boom 141 can be lifted / lowered with respect to the swivel base, that is, the first boom 141 can be pivoted up and down to raise and lower the workbench 60. Further, the bending boom 140 is operated by the second boom elevation hydraulic cylinder 150 so that the link arm 147 is actuated.
The angle between the link arm 148 and the link arm 148 is opened and closed, and the second boom 144 is swung with respect to the first boom 141 so that the second boom 144 can be raised or lowered, that is, the work table 60 is moved up and down. Further, the bending boom 40 includes an inner boom 44a housed inside the second boom portion 142,
44b is expanded and contracted by the operation of a hydraulic cylinder for expansion and contraction (not shown), and the workbench 60 is moved up and down. The end of the connecting portion 43 is housed within the traveling device width (L) as in the first embodiment.

Since the operation in the above-mentioned structure is the same as that of the first embodiment, its explanation is omitted.

FIG. 6 is a third embodiment of the refracting type aerial work vehicle of the present invention.
It is a partially expanded view of the side surface of the embodiment. The same parts as those in the first or second embodiment are designated by the same reference numerals and the description thereof will be omitted. 6, an aerial work vehicle 200 is movable, a traveling device 20, a swivel base 230 mounted so as to be rotatable about the center of the width of the traveling device 20, and a swivel base that can be lifted up and down with respect to the swivel base. Refractive boom 2 installed
40 and a workbench 60 supported by the tip of the boom and used by a worker to board and work. The swivel base 230 includes a swivel frame 131 supported by the swivel bearing 23, and a swivel base cover 232. Swivel cover 23
A pin 234 that supports one end of a link arm that raises the second boom is attached to the upper part of the boom support pin 33. Although the pin 234 is attached to the swivel base cover 232, a dedicated support base may be provided and the support base may be attached to the swivel base. Although not shown, the swivel base 230 accommodates various devices inward as in the first embodiment, and the swivel base 230 has an outer shape (M) half as large as the turning center (CL). It is rounded into a circular shape (R) and accommodated in the traveling device width (L), and at least the side opposite to the workbench 60 with respect to the turning center (CL) is also viewed from the workbench 60 by the driver. It is inclined (S) so that there are few blind spots.

The refracting boom 240 is a box-shaped first boom.
A boom 141 and a second boom portion 142, a connecting portion 43 that connects the first boom 141 and the second boom portion 142,
The second boom part 142 is composed of a link device 245 that operates so that the second boom part 142 can be raised and lowered with respect to the first boom 141. The link device 245 includes a second boom hoisting link arm 246 whose one end is pivotally supported by a pin 234 on the swivel base 232.
And link arms 147, 14 pivotally supported by a pin 146 on the other end of the second boom hoisting link arm 246.
8 and the other end of the link arm 147 is pivotally supported on the first boom 141 by a pin 151.
The other end of 48 is pivotally supported on the second boom 144 by a pin 152. The bendable boom 240 has a swivel base 1 at one end.
30 to the pin 134 and the other end to the first boom 141 to the pin 1
The operation of the boom / elevation hydraulic cylinder 50 connected by 49 causes the first boom 141 to be raised / lowered with respect to the swivel base 230, that is, swingable vertically. With the rotation of the first boom 141, the second boom hoisting link arm 246 rotates about the pin 234 as a fulcrum to open and close the angle between the link arm 147 and the link arm 148.
The second boom 144 is oscillated with respect to the boom 141 so that the second boom 144 can be lifted up and down, that is, oscillated so as to be vertically rotatable.
Move 0 up and down. Further, the bendable boom 40 has a second
Inner booms 44a, 4 stored inside the boom section
4b is expanded and contracted by the operation of a hydraulic cylinder for expansion and contraction (not shown) to elevate and lower the workbench 60. The end of the connecting portion 43 is the first
It is accommodated within the traveling device width (L) as in the embodiment.

Since the operation in the above-mentioned structure is the same as that of the first embodiment, its explanation is omitted. In the above embodiment, the opening angle of the first boom and the second boom is set to 180 in drawing.
Although it is not more than a degree, it can be made larger by appropriately setting the length of the link arm or the fulcrum.

[0028]

As described above, according to the present invention,
Since the boom can be hoisted at a large angle, it is possible to reduce the area where the work cannot be performed from the turning center when hoisting at maximum.
Also, by placing the end of the swivel base and the end of the connecting part of the first boom and the second boom of the bending type within the entire width of the traveling device, the revolving superstructure can make a very small turn and the work efficiency is significantly improved. In addition, it is possible to reduce the blind spots when the driver looks at the ground from the work table by keeping the traveling device within the entire width and rounding the shape of the revolving structure, thus improving safety.
Further, the total length of the boom in a lowered state during transportation is shortened, which improves transportability. Also, since the swivel is stored within the entire width of the traveling device, it is only necessary to secure a road with a width that allows the vehicle to pass, in addition to the entire width of the traveling device for aerial work vehicles, and work on narrow roads becomes possible. , Reducing traffic interruptions. An excellent effect is obtained in that the risk of the work platform falling over is reduced when the boom is raised to the maximum.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment of an aerial work vehicle according to the present invention.

FIG. 2 is a plan view of a first embodiment of an aerial work vehicle according to the present invention.

FIG. 3 is a diagram illustrating the operation of the aerial work vehicle of the present invention.

FIG. 4 is a diagram illustrating work ranges of an aerial work vehicle of the present invention and a conventional aerial work vehicle.

FIG. 5 is a partially enlarged view of a side surface of a second embodiment of an aerial work vehicle according to the present invention.

FIG. 6 is a partial enlarged view of a side surface of a third embodiment of an aerial platform vehicle of the present invention.

FIG. 7 is a side view of an example of a conventional aerial work vehicle.

FIG. 8 is a diagram illustrating a work of a conventional example.

[Explanation of symbols]

10 Aerial work vehicle (P) Boom support end 20 Traveling device (Q) Revolving base end 30 Revolving base (M) External shape 31 Revolving frame 32 Revolving base cover 40 Refractive boom 43 Boom connecting part 60 Work table (CL) Center of turning (L) Body width

Front page continuation (72) Inventor, Katsura Hirosawa, 2-3-6 Akasaka, Minato-ku, Tokyo Komatsu Ltd. (72) Inventor, Nobuo Kaneko 2-3-6, Akasaka, Minato-ku, Tokyo Komatsu Ltd.

Claims (2)

[Claims] 1. A traveling device, a revolving base mounted on the traveling device so as to be rotatable about substantially the center of the traveling device, and a tiltable bending boom mounted on the revolving base with respect to the revolving base. In a refracting aerial work vehicle consisting of a work platform supported at the tip of a boom on which an operator rides for maneuvering or working, the length from the swing center to the end of the swivel platform and the bend type from the swing center A refracting aerial work vehicle, characterized in that the length to the end of the connecting portion of the first boom and the second boom is less than half the total width of the traveling device. 2. The upper part of the outer shape of the swivel cover mounted on the swivel base is formed small inward of the vehicle body at least on the side opposite to the work table with respect to the swivel center.
Refractive aerial work vehicle described.