JPH0133437B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is for building bridges by loading workers and materials into a bucket, and lifting the bucket to a high place using a boom that can extend, contract, and lower the bucket. This relates to an aerial work vehicle that can perform work such as assembling, repairing, and painting objects.

[Conventional technology]

For work such as assembling, repairing, and painting tall structures such as overpasses, skyscrapers, and street lights, a bucket is attached to the tip of a boom that can be extended, contracted, and lowered. Aerial work vehicles are often used to move objects up to the ground.

Since this aerial work vehicle had a bucket connected to the tip of the elongated boom, the center of gravity varied depending on the extension and height of the boom, and in some cases there was a risk of the vehicle tipping over. For this reason, it is often used to fix a weight in a position opposite to the direction in which the boom expands and contracts on the car body, and sets the center of gravity of the car body to the rear. This is not desirable. For this reason, if the distance between the base of the boom and the fixed position of heavy equipment such as the engine on the top of the vehicle body is increased, the center of gravity will be located at the rear, resulting in better balance, but when the boom is rotated, the turning range will be reduced. It is wide and not desirable.

[Problem to be solved by the invention]

In view of these drawbacks, it would be possible to utilize the weight of heavy equipment necessary for aerial work vehicles such as the power source mechanism and pressure oil tank, and use the weight of these items as a counterbalance. The overall weight can be reduced. In addition, a boom that can be extended and retracted at the same time and held down is preferable in terms of weight distribution because it allows heavy equipment to be placed as far away as possible on the vehicle body, and such an aerial work vehicle is needed. was.

[Means for Solving the Problems] The present invention includes a movable vehicle body, a swivel base that can rotate horizontally on the top surface of the vehicle body, and a swivel base that is located on the top surface of the swivel base at a position offset from the center of rotation of the swivel base. A workbench that can be rotated horizontally, a large gear fixed to the car body with the axis of rotation of the turntable aligned with it, a small gear fixed to the workbench aligned with the axis of rotation of the workbench, and a turntable with An intermediate shaft that is supported by a shaft and has interlocking gears fixed to both ends that mesh with large gears and small gears, a drive mechanism installed on the top of the swivel table opposite the workbench, heavy equipment such as tanks, and the top of the workbench. It is placed on
It can be expanded and contracted in its length direction, and
It has a boom that can be lowered vertically and a bucket attached to the tip of the boom, and when the swivel base rotates relative to the vehicle body, the work platform rotates at twice the speed in the opposite direction of the swivel base. To provide an aerial work vehicle characterized by being able to

[Effect]

In the present invention, the high-altitude work mechanism including the telescoping boom is installed in front of the swivel table, and the heavy equipment such as the engine, hydraulic pressure generating mechanism, and tank is installed behind the swivel table, resulting in good weight distribution. Since there is no need to mount unnecessary heavy items such as a counterbalance, the overall weight of the vehicle can be reduced.

In addition, the rotating direction of the swivel platform and the work platform equipped with the aerial work mechanism are reversed, and the rotation speed is set to double, so when the long aerial working mechanism including the boom turns, the swivel platform is To provide an aerial work vehicle that can narrow the turning range of a boom because the length can be shortened.

〔Example〕

An embodiment of the present invention will be described below.

Figure 1 is a side view of this embodiment, Figure 2 is a front view,
FIG. 3 is a plan view.

This aerial work vehicle is self-propelled, and wheels 11 are pivoted at the four corners of the lower surface of the flat vehicle body 10, and between each pair of wheels 11 on both sides of the vehicle body 10, there are two Orbit) 12 is wound around. A ring-shaped support plate 13 is fixed to the center of the upper surface of the vehicle body 10.
A swivel table 14 having a modified octagonal shape is pivotally supported on 3 so as to be freely rotatable in the horizontal direction. The swivel base 14 has a planar shape with each vertex of an equilateral triangle cut out, and an engine 15 and a fuel tank are installed along the periphery of the swivel base 14 at the upper rear of the swivel base 14 (on the left side of FIGS. 1 and 3). 16. Heavy equipment such as hydraulic oil tank 17 is installed.
It is fixed. Further, a hydraulic motor 18 is fixed at a position slightly closer to the fuel tank 16 than the center of the upper surface of the swivel base 14 with its drive shaft directed downward.

In front of this swivel table 14 (right side in Figures 1 and 3)
An annular holding plate 19 is placed and fixed on the upper part of the holding plate 19, and the central axis of the above-mentioned supporting plate 13 and the central axis of this holding plate 19 are offset in the horizontal direction, and
They are arranged so that they are parallel. This holding plate 1
A circular workbench 20 is rotatably supported on the holding plate 19 on the workbench 9, and a pair of supporters 21 are mounted on the workbench 20 so as to be spaced apart and parallel to each other.
A boom 22 is pivotally supported at the top between the two shaft supports 21 by a pin 23 so as to be able to swing up and down.

The boom 22 is hollow inside, and a payout boom 24 is slidably inserted from the tip of the boom 22, and a bucket 25 on which a worker rides is connected to the tip of the payout boom 24. A hydraulic cylinder 26 for lowering the boom 22 is interposed between the shaft support 21 and the boom 22.
A hydraulic cylinder 27 is interposed between the bucket belt 25 and the bucket belt 25 to adjust the attitude of the bucket belt 25, and a hydraulic cylinder (not shown) for extending and retracting the feeding boom 24 is housed within the boom 22. A flexible hydraulic conduit 28 is connected between the payout boom 24 and the boom 22, and a control box 29 is fixed on the bucket 25.

Next, FIG. 4 shows the turning mechanism in this embodiment in detail, and corresponds to the sectional view taken along the line AA in FIG. 3.

On the support plate 13 mentioned above, the outer diameter is approximately the same as the support plate 13.
A circular drive gear 33 with a tooth profile cut and formed on the inner periphery is fixed to the drive gear 33, and an annular slider 35 is rotatably fitted to the outer periphery of the drive gear 33 via a bearing 34. There is. The swivel base 14 is fixed to the upper surface of the slider 35, and the swivel base 14 can rotate around the drive gear 33. A pinion 37 is rotatably attached to the output shaft 36 of the hydraulic motor 18, and the pinion 37 is meshed with an internal tooth surface of the drive gear 33.

Further, an L-shaped shaft support piece 38 is fixed to the lower surface of the swivel base 14 on the inner peripheral side of the drive gear 33, and bearings 39 and 40 are provided on this shaft support piece 38 and the swivel base 14, respectively. The intermediate shaft 41 is supported by both bearings 39 and 40 and is mounted on the swivel base 14.
It penetrates the top and bottom surfaces of.

A pinion 42 is fixed between the shaft support piece 38 of the intermediate shaft 41 and the swivel base 14.
are meshed with the inner peripheral tooth surface of the drive gear 33.
Further, a ring-shaped shaft support 43 having an outer diameter approximately the same as that of the holding board 19 is fixed on the holding plate 19, and the inner circumference of the shaft support 43 is annular and has an outer diameter. The driven gear 45, which has approximately the inner diameter of the shaft support 43 and has a tooth profile cut thereon, is positioned on the inner periphery of the shaft support 43.
A bearing 44 is interposed between the driven gear 45 and the driven gear 45.

The above-mentioned workbench 20 is connected to this driven gear 45.
It is placed and fixed on the upper surface of the workbench 20 and can be rotated about the central axis of the workbench 20 and the shaft support 43 as its rotation center. In addition, the above-mentioned intermediate shaft 41
A pinion 46 is fixed to the upper end of the driven gear 45, and this pinion 46 meshes with the inner peripheral tooth surface of the driven gear 45. The pinions 42 and 46 are formed to have the same outer diameter, and the inner diameter of the driving gear 33 is the same as that of the driven gear 4.
It is set to twice the inner diameter of No.5.

In addition, FIG. 5 is an exploded perspective view of the rotating member of this turning mechanism, and FIG. 6 is a plan view showing the positional relationship of the rotating member same as above.

Next, the operation of this embodiment will be explained.

To perform work at heights, a worker is placed in the bucket 25 and materials are loaded into it, and the worker operates the levers and switches in the control box 29 to fully operate the aerial work vehicle. is controlled.

First, when the hydraulic cylinder 26 is extended, the boom 22 rotates upward around the pin 23, lifting the bucket 25 upward and to a high position. At the same time, the hydraulic cylinder 27 expands and contracts in synchronization, and is corrected so that it is always vertical.

Then, when a hydraulic cylinder (not shown) in the boom 22 is operated, the payout boom 24 protrudes from the boom 22 and lifts the bucket 25 to a higher position. In this operation, when workers and materials are loaded into the bucket 25, the boom 2
2, the load on the tip of the swivel table 14 is large, but since the engine 15, fuel tank 16, and hydraulic oil tank 17 are mounted on the rear of the swivel base 14, the center of gravity is always at the rear, and the center of gravity is always at the rear. By extending the boom 24, the bucket 25 can be stably lifted to a high place without losing balance even if the center of gravity moves forward.

Figure 7 shows the positional relationship of the center of gravity of this aerial work vehicle, showing the engine 15, fuel tank 16,
Weight W1 of heavy equipment such as hydraulic oil tank 17
and the weight W2 of bucket 25 and loaded materials, etc.
It can be seen that the balance is well maintained.

Next, the bucket 2 that was facing the front of the vehicle body 10
5 is directed toward the rear of the vehicle body 10 by rotating the swivel base 14 by 180 degrees on the vehicle body 10. For this purpose, first the hydraulic motor 1
When hydraulic pressure is supplied to 8, the output shaft 36 rotates, the pinion 37 rolls on the internal tooth surface of the drive gear 33, and the slider 35 is rotated along the outer periphery of the drive gear 33. As a result, the swivel base 14 to which the slider 35 is fixed rotates around the central axis of the drive gear 33.

When the swivel base 14 rotates, the pinion 4
2 is rolled along the internal teeth of the drive gear 33,
The pinion 42, the intermediate shaft 41, and the connected pinion 46 are rotated in proportion to the amount of rotation of the rotation table 14. As this pinion 46 is driven and rotates, the driven gear 45 meshed with the pinion 46 is rotated, and the driven gear 45 is rotated along the inner circumference of the shaft support 43 in a direction opposite to the rotating direction of the swivel base 14. It will rotate. Therefore, the workbench 20 and boom 22 fixed to the driven gear 45 also rotate in the opposite direction to the swivel base 14, and the boom 22 and bucket 25 protruding from the shaft support 21 move upwards above the vehicle body 10 as the swivel base 14 rotates. It passes through and protrudes to the rear of the vehicle body 10, and changes to a position opposite to the left and right of FIG. 1.

In this rotation of the turning table 14 and the work table 20,
The inner diameter of the drive gear 33 is set to twice that of the driven gear 45, and the pinions 42 and 46 are set to the same outer diameter, so the workbench 20 is twice as large as that of the driven gear 45.
It will rotate twice as much. Therefore, when the swivel table 14 rotates 180 degrees from the front to the rear of the vehicle body 10, the work table 20 rotates 360 degrees accordingly.
The boom 22 passes over the swivel base 14 and moves to a state where it extends to the rear of the vehicle body 10.

When the swivel platform 14 rotates, the work platform 20 also rotates in the opposite direction in synchronization, so the length of the boom 22 is offset by the eccentric distance of the work platform 20 on the swivel platform 14, reducing the exclusive range during the swivel. This makes it possible to change the direction of the long boom 22 without swinging it around much. Note that when the work platform 20 rotates, the boom 2
When 2 is operated in the extended state, the center of gravity is at the vehicle body 1.
Since the boom 24 protrudes far beyond the side of the swivel base 14, when turning, the feed boom 24 is housed in the boom 22 to shorten the overall length, and the boom 22 is held down in the vertical direction to balance the heavy equipment mounted on the swivel base 14. may be necessary.

〔effect〕

Since the present invention is configured as described above, the center of gravity can be positioned rearward on the workbench and the distance the center of gravity moves when the bucket is lifted to a high place can be reduced, thereby reducing the risk of falling. It can be prevented.

Furthermore, when the boom is turned to change direction, it can be turned within a small turning range, making it possible to change direction in a narrow space.

[Brief explanation of drawings]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is a front view of the same as above, Figure 3 is a plan view of the same as above, and Figure 4 is a front view of the same as above.
The figure is a cross-sectional view taken along arrow A-A in Figure 3 showing the turning mechanism in detail; Figure 5 is an exploded perspective view showing the configuration of the turning mechanism; Figure 6 is an explanatory diagram showing the arrangement of the turning mechanism; FIG. 7 is an explanatory diagram showing the balance of the center of gravity. 10...Vehicle body, 14...Swivel base, 20...Work platform, 22...Boom, 24...Feeding boom, 25
...bucket, 33...driving gear as a large gear, 45...driven gear as a small gear, 41...
Intermediate shaft, 42, 46...pinion as interlocking gear.

Claims (1)

[Claims] 1. A movable vehicle body, a swivel base that can rotate horizontally on the top surface of the vehicle body, a work platform that can rotate horizontally on the top surface of the swivel base at a position offset from the center of rotation of the swivel base, and a rotating base that can rotate horizontally on the top surface of the swivel base. A large gear fixed to the car body with its axes aligned, a small gear fixed to the workbench with its axis aligned with the rotating axis of the workbench, and a large gear and a small gear supported on the rotating platform, respectively. An intermediate shaft with fixed interlocking gears, a drive mechanism installed on the top of the swivel table opposite to the workbench, heavy equipment such as tanks, and a machine placed on the top of the workbench that expands and contracts in its length direction. It has a boom that can be lowered vertically and a bucket attached to the tip of the boom, and when the swivel base rotates with respect to the vehicle body, the work platform can be moved 2 times in the opposite direction of the swivel base. An aerial work vehicle that is characterized by the ability to rotate at twice the speed.