JP5869242B2 - Aerial work platform - Google Patents

Description

  The present invention relates to an aerial work vehicle provided with a swingable jib and a workbench at the tip of a boom.

As an aerial work vehicle as described above, for example, a vehicle body that can travel, a boom that can be raised and lowered on the vehicle body, a jib that is swingably provided at the tip of the boom, and a tip of the jib There is an aerial work vehicle including a work table disposed (see, for example, Patent Document 1). An example of such an aerial work vehicle is shown in FIG.

A conventional aerial work vehicle shown in FIG. 9 includes a boom 101 that can be raised and lowered on a vehicle body, a jib 102 that is swingably connected to the tip of the boom 101, and a jib 1 for the boom 101.
The main body is composed of a hydraulic refraction cylinder 103 that swings 02 and a work table (not shown) disposed at the tip of the jib 102. A first link member 10 is provided near the tip of the boom 101.
5, one end of the second link member 106 is connected to the vicinity of the base end portion of the jib 102, and the other end portions of the first link member 105 and the second link member 106 are both cylinders of the refraction cylinder 103. Connected to the tube side end. The end of the refraction cylinder 103 on the rod side is connected to the middle part of the jib 102, and as shown in FIG.
3 is reduced, the jib 102 swings so as to be folded over the boom 101, and FIG.
As shown in b), when the refracting cylinder 103 is extended, the jib 102 swings so as to extend substantially straight with respect to the boom 101.

JP-A-4-246098

However, in such a conventional aerial work platform, even if the refracting cylinder 103 is extended to the maximum extent, the jib 102 extends and is offset downward with respect to the boom 101. The work range in the vicinity of the maximum undulation angle of the boom 101 at which the position of the work table becomes the highest is narrowed by the amount that does not extend straight (that is, the amount of offset).

The present invention has been made in view of such a problem, and an object thereof is to provide an aerial work vehicle with an expanded work range.

In order to achieve such an object, an aerial work vehicle according to the present invention includes a vehicle body that can travel, a boom that is provided on the vehicle body so as to be movable up and down at least, and a hoisting of the boom at a tip portion of the boom. An intermediate link member connected to be swingable up and down along the surface, a jib connected to the tip of the intermediate link member so as to be swingable up and down along the undulation surface of the boom, A work table disposed at a distal end; a first hydraulic cylinder that swings the intermediate link member relative to the boom; and a second hydraulic cylinder that swings the jib relative to the intermediate link member. The first hydraulic cylinder and the second hydraulic cylinder are arranged in parallel with each other in the left-right direction of the intermediate link member and on the bottom side of the intermediate link member so as to cross each other when viewed from the side of the intermediate link member. That One end of the first hydraulic cylinder is rotatably connected to the distal end side of the intermediate link member, and one end of the second hydraulic cylinder is rotatable to the proximal end side of the intermediate link member. The other end sides of the first hydraulic cylinder and the second hydraulic cylinder intersect with each other and are connected to the distal end portion of the boom and the base end portion of the jib, respectively , and one end of the first hydraulic cylinder is The intermediate link member and the jib are connected to each other at or near the connecting portion so as to be rotatable coaxially with the swing shaft of the jib, and one end of the second hydraulic cylinder is connected to the boom and the intermediate link. in connection portion or the connecting portion near the member, and is so that rotatably connected with the intermediate link oscillation axis of the member coaxially.

In the above-described invention, the intermediate link member includes a swing angle position of the first intermediate link member that makes an angle with the boom near 180 degrees due to expansion and contraction of the first hydraulic cylinder, and the boom. , And the jib can be swung by the expansion and contraction of the second hydraulic cylinder.
The first jib rocking angle position where the angle formed with the intermediate link member is about 180 degrees and the second jib rocking angle position where the angle formed with the intermediate link member is near 90 degrees It is preferable to be able to swing between the two.

Further, in the above-described invention, the work table is disposed at the tip end portion of the jib so as to be able to swing up and down along the undulating surface of the boom. It is preferable to provide a leveling device that keeps the angle posture of the work table constant regardless of the swing angle position of the intermediate link member and the swing angle position of the jib relative to the intermediate link member.

According to the present invention, one end of the first hydraulic cylinder is rotatably connected to the distal end side of the intermediate link member, and one end of the second hydraulic cylinder is rotatably connected to the proximal end side of the intermediate link member, The other end sides of the first hydraulic cylinder and the second hydraulic cylinder intersect with each other and are coupled to the distal end portion of the boom and the proximal end portion of the jib, respectively. Therefore, since the jib extends more straightly with respect to the boom by the intermediate link member, the work range can be expanded.

In the above-described invention, the intermediate link member swings between a swing angle position at which the angle with the boom is about 180 degrees and a swing angle position at which the angle with the boom is near 90 degrees. The jib can swing between a swing angle position where the angle formed with the intermediate link member is about 180 degrees and a swing angle position where the angle formed with the intermediate link member is close to 90 degrees. If this is the case, the jib can be swung from the folded state to the boom to the substantially straight state, and at this time, the intermediate link member and the jib swing angle range by the first hydraulic cylinder and the second hydraulic cylinder. Therefore, the size of the hydraulic cylinder can be reduced.

Further, in the above-described invention, leveling that maintains the angular attitude of the work table constant regardless of the boom angle position, the swing angle position of the intermediate link member relative to the boom, and the swing angle position of the jib relative to the intermediate link member. By providing the device, it is possible to swing the jib having the work table disposed at the distal end thereof with respect to the intermediate link member or the boom while keeping the angle posture of the work table constant by the leveling device.

Further, in the above-described invention, one end of the first hydraulic cylinder is rotatably connected coaxially with the swing shaft of the jib, and one end of the second hydraulic cylinder rotates coaxially with the swing shaft of the intermediate link member. By freely connecting, the jib extends more straightly with respect to the boom, so that the working range can be further expanded.

It is a figure which shows the state from which a jib and an intermediate link member are extended substantially straight with respect to a boom. It is a side view of an aerial work vehicle. It is a top view of an aerial work vehicle. It is a rear view of an aerial work vehicle. It is a figure which shows the state which the boom of the aerial work vehicle stood and extended. It is the perspective view which looked at the intermediate link member from the lower part. (A) is a figure which shows the state in which a jib is folded over with respect to a boom, (b) is a figure which shows the state in which a jib is extended at a substantially right angle with respect to an intermediate link member and a boom. It is a figure which shows the state in which a jib and an intermediate link member are extended at a substantially right angle with respect to a boom. (A) is a figure which shows the state in which a jib is folded over with respect to a boom in the conventional aerial work vehicle, (b) is a figure which shows the state in which a jib is extended substantially straight with respect to a boom.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. An aerial work vehicle 1 according to the present embodiment is shown in FIGS. The aerial work vehicle 1 is capable of traveling with front and rear wheels 3a and 3b, and is constructed based on a truck vehicle having a driving cab 2a at the front.
On the vehicle body 2 of the truck vehicle, a turntable 5 that is driven by a turn motor (hydraulic motor) (not shown) so as to be horizontally turnable is disposed. In addition, outriggers 6 that are extendable downward are provided at four locations on the front, rear, left, and right of the vehicle body 2, and when performing a work at a high place, the vehicle body 2 can be lifted and supported by projecting the outrigger 6 downward.

A boom 10 is attached to the swivel base 5 with a base end portion pivoted. The boom 10 is moved up and down by a lifting cylinder 7. In the present embodiment, a plane including the locus of the boom 10 when the boom 10 is moved up and down is referred to as a raised surface of the boom 10. As shown in FIG. 5, the boom 10 includes a proximal boom 11 and a first intermediate boom 12.
The second intermediate boom 13 and the tip boom 14 are combined in a nested manner, and can be extended and retracted by a built-in telescopic cylinder (not shown). The tip boom 14 has a boom head 15 at the tip, and an intermediate link member 20 is connected to the tip of the boom head 15 so as to swing up and down along the undulating surface of the boom 10. Further, the jib 30 is coupled to the tip of the intermediate link member 20 so as to be swingable up and down along the undulating surface of the boom 10.

As shown in FIGS. 1 and 6, the intermediate link member 20 is formed in a frame plate shape whose left and right side portions are connected to the tip boom 14 and the jib 30. On the bottom side of the intermediate link member 20, the first link
The hydraulic cylinder 21 and the second hydraulic cylinder 26 are arranged in parallel to each other in the left-right direction of the intermediate link member 20 so as to intersect each other when viewed from the side of the intermediate link member 20.

A boom side link connecting portion 16 is formed at the upper end portion of the boom head 15, and the base end portion of the intermediate link member 20 is connected to the inside of the boom side link connecting portion 16 using a connecting pin (not shown). Connected. At the lower end of the boom head 15, the boom-side first cylinder connecting portion 1
7 is formed, and the end of the first hydraulic cylinder 21 on the cylinder tube 22 side is rotatably connected using the illustrated connecting pin or the like. In addition, although detailed illustration is abbreviate | omitted, in the base end part of the intermediate link member 20 located in the vicinity of the boom side link connection part 16, the 2nd hydraulic cylinder 2 is provided.
A boom-side second cylinder connecting portion is formed in which the end portion on the piston rod 28 side of 6 is rotatably connected.

The jib 30 has a jib base 31 at the base end, and the intermediate link member 20 is attached to the jib base 31.
Etc. are connected. A jib side link connecting portion 32 is formed at the base end of the swing center side of the jib base 31, and the tip of the intermediate link member 20 is placed outside the jib side link connecting portion 32 using a connecting pin (not shown). The parts are connected. A jib-side first cylinder coupling portion 33 is formed in the jib base 31 in the vicinity of the inside of the jib-side link coupling portion 32, and the end of the first hydraulic cylinder 21 on the piston rod 23 side is rotatably coupled. A jib-side second cylinder connecting portion 34 is formed at the base end of the swinging inner periphery of the jib base 31, and using the connecting pins shown in the drawing,
The end of the second hydraulic cylinder 26 on the cylinder tube 27 side is rotatably connected.

The first hydraulic cylinder 21 has a first cylinder tube 22 and a first piston rod 23, and expands and contracts by moving the first piston rod 23 in and out of the first cylinder tube 22 using hydraulic pressure. Configured to be possible. The end of the first piston rod 23 is connected to the jib side first cylinder connecting portion 33 of the jib base 31 so as to be rotatable coaxially with the swing shaft of the jib 30. On the other hand, the end of the first cylinder tube 22 is the first boom side of the boom head 15.
The cylinder connecting portion 17 is rotatably connected on an axis parallel to the swing axis of the intermediate link member 20. Accordingly, as the first hydraulic cylinder 21 expands and contracts, as shown in FIG.
(Referred to as the link swing angle position) and the swing angle position of the second intermediate link member 20 (hereinafter referred to as the first link link angle position) where the angle between the boom 10 and the boom 10 is about 90 degrees as shown in FIGS. The intermediate link member 20 is configured to be swingable between the two link swinging angle positions).

The second hydraulic cylinder 26 has a second cylinder tube 27 and a second piston rod 28, and is expanded and contracted by moving the second piston rod 28 in and out of the second cylinder tube 27 using hydraulic pressure. Configured to be possible. The end of the second piston rod 28 is connected to a boom side second cylinder connecting portion (not shown) of the intermediate link member 20 so as to be rotatable coaxially with the swing shaft of the intermediate link member 20. On the other hand, the end of the second cylinder tube 27 is rotatably connected to the jib-side second cylinder connecting portion 34 of the jib base 31 on an axis parallel to the swing axis of the jib 30. Thereby, as the second hydraulic cylinder 26 expands and contracts, the swing angle position of the first jib 30 (hereinafter referred to as the first jib swing) becomes an angle formed with the intermediate link member 20 near 180 degrees as shown in FIG. 7), the swing angle position of the second jib 30 (hereinafter referred to as the second jib swing angle position) at which the angle formed with the intermediate link member 20 is close to 90 degrees as shown in FIG. The jib 30 is configured to be able to swing between the two.

A support member 40 is pivotally coupled to the tip of the jib 30 so as to swing up and down along the undulating surface of the boom 10. This support member 40 has a vertical post portion 41, and swinging control of the support member 40 is performed by a leveling device 42, and the boom 10 undulation angle position, the swing angle position of the intermediate link member 20 with respect to the boom 10, and the intermediate Regardless of the swing angle position of the jib 30 with respect to the link member 20, the support member 40 is controlled to swing so that the vertical post portion 41 always extends vertically. The leveling device 42 has a leveling cylinder 43 whose one end is pivotally connected to the middle portion of the jib 30 and both ends pivotally connected to the jib 30 and the support member 40, and an intermediate portion is connected to the other end of the leveling cylinder 43. A link mechanism 44 that is pivoted to swing the support member 40 (vertical post portion 41) up and down in accordance with the expansion and contraction operation of the leveling cylinder 43 is configured.

In this way, the vertical post 41 that is always held vertically can be swung horizontally (freely swingable).
A work table 50 is attached, and the work table 50 is always held horizontally regardless of the above-described undulation angle position of the boom 10, the rocking angle position of the intermediate link member 20, and the rocking angle position of the jib 30. . The work table 50 is provided with an upper operation device 51. The swivel 5
Also, a lower operation device 8 is disposed.

In the aerial work vehicle 1 configured as described above, as shown in FIG. 2, the boom 10 is contracted and overlaid on the vehicle body 2, and the jib 30 is stored in a state of being folded on the boom 10. . At this time, the first hydraulic cylinder 21 is contracted and the intermediate link member 20 swings to the second link swing angle position at which the angle formed with the boom 10 is approximately 90 degrees.
The second hydraulic cylinder 26 is reduced, and the jib 30 swings to the second jib swing angle position at which the angle formed with the intermediate link member 20 is near 90 degrees.

In order to swing the jib 30 from the folded state with respect to the boom 10 to the substantially straight state, first, the raising and lowering cylinder 7 is operated by the operation of the upper operating device 51 or the lower operating device 8.
The boom 10 is raised to a hoisting angle position where the work table 50 does not come into contact with the vehicle body 2 and the ground even if the jib 30 is swung downward. Next, by operating the upper operating device 51 or the lower operating device 8, the first hydraulic cylinder 21 is extended, and the boom 10 is moved from the second link swing angle position at which the angle with the boom 10 is about 90 degrees. The intermediate link member 20 is swung (upward) to the first link rocking angle position at which the angle formed by If it does so, the jib 30 will be in the state bent only 90 degree | times below with respect to the boom 10 as shown in FIG.7 (b) from the state folded over with respect to the boom 10 as shown to Fig.7 (a).

The second hydraulic cylinder 26 is operated by operating the upper operating device 51 or the lower operating device 8.
The first jib swing angle position where the angle formed with the intermediate link member 20 is approximately 180 degrees from the second jib swing angle position where the angle formed with the intermediate link member 20 is approximately 90 degrees. The jib 30 is swung (upward). Then, the jib 30 is bent by 90 degrees downward with respect to the boom 10 as shown in FIG. 7B, and the boom 1 as shown in FIG.
It becomes a state of extending almost straight with respect to zero. When the jib 30 is bent at an arbitrary angle with respect to the boom 10, for example, as shown in FIG. 5, the jib 30 is swung to the first jib swing angle position (that is, the jib 30 is Only the intermediate link member 20 can be swung with respect to the boom 10 while remaining substantially straight with respect to the intermediate link member 20. Further, for example, as shown in FIG. 7B, the intermediate link member 20 is swung to the first link swing angle position (that is, the intermediate link member 20 extends substantially straight with respect to the boom 10). As it is, only the jib 30 can be swung with respect to the intermediate link member 20.

In addition, in order to swing the jib 30 from the state of extending substantially straight with respect to the boom 10 to the state of being folded, the operation opposite to that described above may be performed. That is, the second hydraulic cylinder 26
And the second jib swing angle position where the angle between the intermediate link member 20 and the intermediate link member 20 is approximately 90 degrees from the first jib swing angle position where the angle with the intermediate link member 20 is approximately 180 degrees. After the jib 30 is swung, the first hydraulic cylinder 21 is contracted, and the angle formed with the boom 10 is 90 degrees from the first link swing angle position where the angle formed with the boom 10 is approximately 180 degrees. The intermediate link member 20 may be swung to the second link rocking angle position near the angle.

As a result, according to the present embodiment, one end of the first hydraulic cylinder 21 (the first piston rod 2
3) is rotatably connected to the distal end side of the intermediate link member 20, and the second hydraulic cylinder 2
6 (the end of the second piston rod 28) is rotatably connected to the base end side of the intermediate link member 20, and the other end sides of the first hydraulic cylinder 21 and the second hydraulic cylinder 26 cross each other. Are connected to the distal end portion of the boom 10 and the proximal end portion of the jib 30. Therefore, since the jib 30 extends more straightly with respect to the boom 10 by the intermediate link member 20, the work range in the vicinity of the maximum undulation angle of the boom 10 at which the position of the work table 50 becomes the highest can be expanded. Further, the bending angle of the jib 30 (or the boom 10) necessary for obtaining the work range.
Therefore, the operating range of the leveling device 42 is reduced, and the leveling device 42, that is, the tip side of the jib 30 can be made compact. In addition, in the state where the jib 30 is extended with respect to the boom 10, the hydraulic cylinders 21, 26 and the intermediate link member 20 have few portions protruding downward or upward from the boom 10, so that the boom 10 is moved up and down or expanded and contracted. Sometimes, there is little possibility of interference with other structures, and workability can be improved.

In addition, the intermediate link member 20 has a first link swing angle position where the angle formed with the boom 10 is approximately 180 degrees, and a second link swing angle position where the angle formed with the boom 10 is approximately 90 degrees. The first jib swing angle position where the angle formed between the jib 30 and the intermediate link member 20 is about 180 degrees and the angle formed between the intermediate link member 20 is about 90 degrees. Since it can swing between two jib swing angle positions, the jib 30 can be swung from a state where it is folded with respect to the boom 10 to a state where it extends almost straight. At this time, the first hydraulic cylinder 21 is also swung. Since the swing angle range of the intermediate link member 20 and the jib 30 by the second hydraulic cylinder 26 is about half that of the conventional art, the size of the hydraulic cylinder can be reduced.

Further, regardless of the undulation angle position of the boom 10, the swing angle position of the intermediate link member 20 with respect to the boom 10, and the swing angle position of the jib 30 with respect to the intermediate link member 20, the work table 50.
By providing the leveling device 42 that keeps the angle posture of the work table 50 constant, the leveling device 42 keeps the angle posture of the work table 50 constant, and the jib 30 on which the work table 50 is disposed at the distal end portion is connected to the intermediate link member. 20 and the boom 10 can be swung.

Further, one end of the first hydraulic cylinder 21 (the end of the first piston rod 23) is rotatably connected coaxially with the swing shaft of the jib 30 in the vicinity of the connecting portion between the intermediate link member 20 and the jib 30. The one end of the second hydraulic cylinder 26 (the end of the second piston rod 28)
In the vicinity of the connecting portion between the intermediate link member 20 and the intermediate link member 20, the jib 30 extends more straightly with respect to the boom 10 by being rotatably connected coaxially with the swing shaft of the intermediate link member 20. Can be further expanded.

In the above-described embodiment, the boom 10 is configured to be extendable and retractable. However, the present invention is not limited to this, and the boom 10 may not be expanded and contracted as long as the boom is at least movable up and down.

Moreover, in the above-mentioned embodiment, although the boom 10 which can be expanded-contracted is comprised from 4 steps | paragraphs of booms, it is not restricted to this, You may be comprised from 3 steps | paragraphs of booms.

Moreover, in the above-mentioned embodiment, not only the boom 10 but the jib 30 may be configured to be extendable and retractable.

Further, in the above-described embodiment, when the jib 30 is swung from the folded state with respect to the boom 10 to the substantially straight state, the first hydraulic cylinder 21 is extended and the angle formed with the boom 10 is 90 degrees. After the intermediate link member 20 is swung (upward) from the second link rocking angle position in the vicinity to the first link rocking angle position in which the angle with the boom 10 is near 180 degrees, the second hydraulic pressure is When the cylinder 26 is extended and operated, the first jib swing that makes the angle with the intermediate link member 20 near 180 degrees from the second jib swing angle position that makes the angle with the intermediate link member 20 near 90 degrees. The jib 30 is swung (upward) to the angular position.
It is not limited to this. For example, as shown in FIG. 8, the second hydraulic cylinder 26 is extended to move the jib 30 (downward) from the second jib swing angle position to the first jib swing angle position.
After swinging, the first hydraulic cylinder 21 may be extended to swing the intermediate link member 20 (upward) from the second link swing angle position to the first link swing angle position. .

In the above-described embodiment, one end of the first hydraulic cylinder 21 is connected to the intermediate link member 20.
And a jib-side first cylinder connecting portion 33 provided in the vicinity of the connecting portion between the jib 30 and the jib 30,
One end of the hydraulic cylinder 26 is connected to a boom-side second cylinder connecting portion (not shown) provided in the vicinity of the connecting portion between the boom 10 and the intermediate link member 20, but is not limited thereto. For example, one end of the first hydraulic cylinder 21 may be integrally connected to the connecting portion between the intermediate link member 20 and the jib 30, and one end of the second hydraulic cylinder 26 may be connected to the boom 10.
The intermediate link member 20 may be integrally connected to the connecting portion. The first
One end of the hydraulic cylinder 21 may not be connected coaxially with the swing shaft of the jib 30, and one end of the second hydraulic cylinder 26 may not be connected coaxially with the swing shaft of the intermediate link member 20.

In the above-described embodiment, the description has been given by taking the truck-type aerial work vehicle 1 as an example of the aerial work vehicle. However, the present invention is not limited to this example. An aerial work vehicle of the type may be used.

DESCRIPTION OF SYMBOLS 1 Aerial work vehicle 2 Car body 10 Boom 11 Base end boom 12 1st intermediate | middle boom 13 2nd intermediate | middle boom 14 Front end boom 15 Boom head 16 Boom side link connection part 17 Boom side 1st cylinder connection part 20 Intermediate link member 21 1st Hydraulic cylinder 26 Second hydraulic cylinder 30 Jib 31 Jib base 32 Jib side link connecting portion 33 Jib side first cylinder connecting portion 34 Jib side second cylinder connecting portion 40 Support member 41 Vertical post portion 42 Leveling device 50 Work table

Claims (3)

A vehicle body that can travel,
A boom that is provided at least up and down on the vehicle body;
An intermediate link member connected to the tip of the boom so as to be swingable up and down along the undulating surface of the boom;
A jib connected to the tip of the intermediate link member so as to be swingable up and down along the boom surface of the boom;
A workbench disposed at the tip of the jib;
A first hydraulic cylinder that swings the intermediate link member with respect to the boom;
A second hydraulic cylinder that swings the jib relative to the intermediate link member;
The first hydraulic cylinder and the second hydraulic cylinder are arranged in parallel with each other in the left-right direction of the intermediate link member and on the bottom side of the intermediate link member so as to intersect with each other when viewed from the side of the intermediate link member. Arranged,
One end of the first hydraulic cylinder is rotatably connected to the distal end side of the intermediate link member,
One end of the second hydraulic cylinder is rotatably connected to the base end side of the intermediate link member,
The other end sides of the first hydraulic cylinder and the second hydraulic cylinder intersect with each other and are connected to the distal end portion of the boom and the proximal end portion of the jib, respectively .
One end of the first hydraulic cylinder is rotatably connected coaxially with the swing shaft of the jib at or near the connecting portion between the intermediate link member and the jib,
One end of the second hydraulic cylinder, the connecting portion or the connecting portion vicinity of the boom and the intermediate link member, and wherein the Rukoto is rotatably connected with the intermediate link oscillation axis of the member coaxially Aerial work vehicle. The intermediate link member has an angle formed between the swing angle position of the first intermediate link member and an angle of 90 degrees with respect to the boom by an angle of 180 degrees with the expansion and contraction of the first hydraulic cylinder. It can swing between the swing angle position of the second intermediate link member in the vicinity,
As for the jib, the angle formed between the first jib rocking angle position where the angle formed with the intermediate link member is approximately 180 degrees and the intermediate link member is 90 degrees due to expansion and contraction of the second hydraulic cylinder. The aerial work vehicle according to claim 1, wherein the work vehicle can swing between a swing angle position of the second jib in the vicinity. The workbench is disposed at the tip of the jib so as to be able to swing up and down along the undulating surface of the boom.
A leveling device that maintains the angular attitude of the work table constant regardless of the boom angle position of the boom, the swing angle position of the intermediate link member relative to the boom, and the swing angle position of the jib relative to the intermediate link member. The aerial work vehicle according to claim 1, further comprising:

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