JP4298047B2 - Platform structure of an aerial work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a platform structure for an aerial work vehicle having a platform that is provided at the tip of a boom and on which an operator and a construction machine are placed.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an aerial work vehicle has a posture maintaining member that is provided at the tip of a boom that can be raised and lowered on the vehicle and that can swing within the hoisting locus plane of the boom, and a posture that is driven by swinging the posture maintaining member. A leveling actuator for maintaining the ground posture of the maintenance member constant, a platform provided on the upper portion of the posture maintenance member so as to be horizontally pivotable, and a pivoting actuator for rotationally driving the platform, the pivot center of the platform being What is located in the floor surface of a platform by planar view is known.
[0003]
The leveling actuator and the turning actuator use a hydraulic pump or the like as a drive source, and the drive device as the drive source is provided in the vehicle, and each actuator is connected to the actuator via a hydraulic line provided along the boom. A driving force is supplied from the driving device.
[0004]
[Problems to be solved by the invention]
By the way, the boom of the aerial work vehicle has become longer due to the recent rise in the number of buildings and the increase in the size of work units at high places. The remarkably appears in the longitudinal direction and the height direction of the vehicle. For this reason, it is desirable that the platform at the time of boom collapse is as low as possible, thereby suppressing the height dimension of the aerial work vehicle when the boom is retracted. In addition, due to the lengthening of the boom, the actuator on the boom tip side and the driving device on the vehicle side are greatly separated, making it difficult to arrange the hydraulic pipes and the like, resulting in poor operation response of the actuator, etc. There is also a high possibility that this will occur. Furthermore, if the actuator is operated by hydraulic pressure, the load on the hydraulic pump that constitutes the drive equipment will increase greatly. To avoid this problem, place the drive equipment as close to the actuator as possible. This is also the case for the equipment required to drive the construction machines used on the platform.
[0005]
However, since such a drive device is generally heavy, if it is provided on the platform, not only the working space is reduced, but also the load of the posture maintaining member that supports the platform and the swing actuator that drives the swing is provided. In addition, there is a problem that it becomes difficult to achieve a horizontal balance of the platform by an amount corresponding to an increase in weight by the driving device. In particular, if the construction machine and the driving equipment for the construction machine are all placed on the platform, the loading weight of the platform will be very large, which is preferable because the load applied to the posture maintaining member and the turning actuator is excessive. Absent.
[0006]
The present invention has been made in view of the above circumstances, and the actuator driving device or the construction machine driving device is disposed near the platform that suppresses the height when the boom collapses, and the work space on the platform is reduced. It is an object of the present invention to provide a platform structure for an aerial work vehicle that can be maintained and can suppress the influence of weighting based on the arrangement of the driving devices.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a posture maintaining member provided at the tip of a boom that can be raised and lowered on a vehicle so as to be swingable within a boom locus trajectory, and swinging and driving the posture maintaining member. A leveling actuator that maintains the attitude of the attitude maintaining member at a constant level regardless of the undulation angle of the boom, a platform that is provided on the upper part of the attitude maintaining member so as to be horizontally rotatable, and a turning actuator that drives the platform to rotate In a high-altitude work vehicle in which the turning center of the platform is located within the floor surface of the platform in plan view, the leveling actuator or a plurality of components necessary for driving the turning actuator or on the platform what needs to maintain a constant attitude of the plurality of constituent devices necessary for driving the construction machine used A platform part structure for an aerial work vehicle disposed on the posture maintaining member so as to be positioned below the platform and at least a part of which overlaps the boom in a side view when the boom is lying down. And
[0008]
According to this invention, the actuator driving device or the construction machine driving device is disposed on the posture maintaining member so that it is positioned below the platform and at least a part of the device overlaps the boom when viewed from the side when the boom is lying down. Therefore, it is possible to maintain the work space on the platform while bringing the drive device close to the actuator and the construction machine, and it is possible to suppress the height of the platform when the boom is collapsed. In addition, since the load weight of the platform does not change due to such an arrangement of devices, the burden on the turning actuator does not increase, and the device is located below the platform, so it is difficult to get in the way during work.
[0009]
Further, the present invention provides a platform portion structure of a high office work vehicle, characterized in that what needs to maintain a constant attitude of the plurality of constituent devices arranged in the position maintaining member.
[0010]
According to the present invention, since the component device that needs to maintain a constant posture is arranged on the posture maintaining member that maintains the ground posture, the posture of the component device can be maintained in the same manner as when the vehicle is provided on the vehicle. .
[0011]
Furthermore, the present invention is characterized in that, in the platform structure of an aerial work vehicle described above , one of the plurality of component devices that does not need to maintain a fixed posture is arranged at the tip of the boom.
[0012]
According to the present invention, since the component device that does not need to maintain a constant posture is disposed at the tip of the boom, the support of the component device is entrusted to the boom that can support a larger load than the posture maintaining member. The weight of the leveling actuator can be reduced.
[0013]
The present invention provides a platform portion structure of the above-mentioned aerial platforms, that each constituent device of the plurality of constituent devices arranged in distributed to the side of the side and the other side surface of one side surface of the boom Features.
[0014]
According to this invention, since each component device is arranged separately on one side and the other side of the boom, the load on the posture maintaining member or the tip of the boom is dispersed, and the weight balance is improved. And torsional load on the boom can be reduced. In addition, since a single unit is smaller than in the case of concentrated arrangement, for example, when component devices are arranged on both the posture maintaining member and the boom tip, it is easy to avoid interference between the two, It is easy to suppress the protruding amount to the side.
[0015]
Further, the present invention is characterized in that, in the platform structure of an aerial work vehicle described above, the device is disposed closer to the base end side of the boom than the front end of the posture maintaining member.
[0016]
According to the present invention, since the driving device is arranged on the base end side of the boom from the front end of the posture maintaining member, the device does not protrude forward with respect to the posture maintaining member and is not disturbed during the operation, and the swinging device A posture maintenance member generated when, for example, a plurality of workers or heavy construction machines ride on a place on the platform opposite to the base end side of the boom and at the normal work position on the platform. The rotational moment in the undulation trajectory plane can be partially or entirely offset by the rotational moment by the device, and the burden on the leveling actuator can be reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 shows a boom type work vehicle (aerial work vehicle) having a platform structure according to the present invention. This boom-type work vehicle 1 includes a vehicle 2, an outrigger device 3, a swivel base 4, a boom 5, and a platform portion 6.
[0019]
The outrigger devices 3 are provided in pairs on the left and right sides of the vehicle 2, and project in the vehicle width direction during work to jack up the vehicle 2. The turntable 4 is provided on the upper surface of the rear part of the vehicle 2 and horizontally turns in the direction of arrow AA by a turn motor (not shown). The boom 5 includes a telescopic boom 14 that can extend and contract in the longitudinal direction, and a jib 15 provided at the tip of the telescopic boom 14. The telescopic boom 14 is provided on the swivel 4 and is driven to lift in the direction of the arrow BB by the lifting cylinder device 16. The jib 15 is driven to swing within the hoisting locus plane of the telescopic boom 14 by the hoisting cylinder device 17 provided on the telescopic boom 14. In FIG. 1, the boom 5 is fully retracted and is in the retracted state.
[0020]
The platform portion 6 is provided at the tip of the jib 15 and includes a leveling frame 7 as a posture maintaining member and a platform 8 provided on the upper portion of the leveling frame 7 as shown in FIGS.
[0021]
The leveling frame 7 includes a mounting portion 7a pin-coupled to the tip of the jib 15, a support portion 7b formed on the top of the mounting portion 7a, and two side plates 7c and 7d along the side surfaces 15a and 15b of the jib 15. With. Brackets 18 and 19 used as mounting parts for constituent devices (hydraulic oil tank and generator) to be described later are attached to the lower portions of the side plates 7c and 7d.
[0022]
The tip of the jib 15 is provided with an inclined portion 15c slightly inclined with respect to the axial direction of the tip, and a leveling cylinder device 9 as a leveling actuator is pin-coupled to the inclined portion 15c. In the leveling cylinder device 9, the rod 9a can be moved back and forth by hydraulic pressure, and the tip of the rod 9a is pin-coupled to the mounting portion 7a of the leveling frame 7. By the forward / backward movement of the rod 9a, the leveling frame 7 uses the point P that is the pin coupling position with the jib 15 as a swing fulcrum so that the ground posture is constant (the horizontal posture of the platform 8 is maintained). ) It is oscillated and driven in the direction of arrow CC 'within the hoisting locus plane of the boom 5.
[0023]
Even when the leveling frame 7 swings in accordance with the falling operation of the boom 5, for example, as shown in FIG. 1, the leveling cylinder device 9 and the inclined portion 15 c of the jib 15 remain on the side plate 7 c of the leveling frame 7. , 7d enters the facing space 7e (see FIG. 2B) and overlaps the leveling frame 7 in a side view, so that interference between the two is prevented.
[0024]
The support portion 7b of the leveling frame 7 incorporates a hydraulic turning device (not shown) as a turning actuator. The platform 8 is fixed to a rotating wheel 10 that is rotated by the hydraulic turning device, and horizontally turns as the hydraulic turning device is driven. Here, the platform 8 has a rectangular shape when viewed from above, and the rotating wheel 10 is located at the center of the rectangle.
[0025]
The hydraulic pressure is supplied to the hydraulic swing device and the leveling cylinder device 9 by a control device, a hydraulic pump, a hydraulic valve, a hydraulic line, and a hydraulic oil tank 11 (not shown). Among these, the control device and the hydraulic valve that do not need to maintain a constant posture are provided so as to be distributed at the front end portions of both side surfaces 15a and 15b of the jib 15 so as to balance the weight, and the waterproof / dust-proof cover 12 is provided. Covered by. The cover 12 does not interfere with the side plates 7c and 7d even in the boom collapsed state, and does not protrude sideways from the platform 8. On the other hand, the hydraulic oil tank 11 for storing the hydraulic oil needs to be maintained horizontally in order to prevent liquid leakage, and is provided on the bracket 18 of the leveling frame 7. The hydraulic pump needs to be provided on the leveling frame 7 if it is directly connected to the engine, but can be provided on the jib 15 side if it is driven by an electric motor.
[0026]
On the platform 8, a construction machine such as an electric drill is used depending on the contents of the work at a high place. However, such a construction machine does not have a drive source and often requires a separate drive device. Therefore, the generator 19 is provided on the bracket 19 of the leveling frame 7 as a device necessary for driving the construction machine. The generator 13 includes a battery, a fuel tank, and the like, and needs to be kept horizontal in order to prevent liquid leakage. The same applies to the engine. The generator 13 is paired with the hydraulic oil tank 11 and balances the weight between the side surface 15a side and the side surface 15b side of the jib 15. The front surface of the hydraulic oil tank 11 and the front surface 13a of the generator 13 are both on the base end side of the boom 5 with respect to the front end portion 7f of the leveling frame 7 (here, further on the base end side of the boom 5 with respect to the swing fulcrum P). ), And the direction of the rotational moment of the leveling frame 7 generated by the drive device coincides with the direction of the arrow C ′. Similarly to the cover 12, the hydraulic oil tank 11 and the generator 13 do not protrude laterally from the platform 8.
[0027]
Since the construction machine driven by the generator 13 is generally used toward a building or the like on the side opposite to the base end side of the boom 5, on the platform 8 where the worker M is present in FIG. Is placed near the position 8a. Since the position 8a is opposite to the base end side of the boom 5 with respect to the swing fulcrum P, the direction of the rotational moment of the leveling frame 7 generated by the construction machine or the like riding on the position coincides with the arrow C direction.
[0028]
In FIG. 2 and FIG. 3, the wiring, piping, etc. for connecting the constituent devices are not shown for convenience.
[0029]
In the platform structure of an aerial work vehicle according to this embodiment, the hydraulic device for driving the actuator and the generator 13 for driving the construction machine are positioned below the platform 8 and at least a part of the boom is provided in the boom. Since the leveling frame 7 and the tip of the boom 5 are arranged so as to overlap the boom 5 when viewed from the side, the working space on the platform 8 can be maintained while bringing the driving device close to the actuator or the construction machine. Further, the height of the platform 8 when the boom is lying down can be suppressed. In addition, since the load weight of the platform 8 does not change due to such an arrangement of devices, the load on the hydraulic swiveling device (not shown) does not increase, and the device is positioned below the platform 8 and does not protrude sideways from the platform 8. Therefore, it is difficult to get in the way during work.
[0030]
In addition, the hydraulic oil tank 11 and the generator 13 that need to maintain a constant posture are arranged on the leveling frame 7 that maintains the ground posture, while other components such as a control device that does not need to maintain a constant posture are provided. Since it arrange | positions at the front-end | tip part of the boom 5, the weight of the leveling frame 7 can be suppressed as much as possible, and the load of the leveling cylinder apparatus 9 can be reduced. Since these components are arranged separately on one side and the other side of the boom 5, the loads on the leveling frame 7 and the tip of the boom 5 are dispersed, the weight balance is improved, the boom 5 torsional load can be reduced.
[0031]
Since the hydraulic oil tank 11 and the generator 13 are disposed on the base end side of the boom 5 with respect to the front end portion 7f of the leveling frame 7, the device does not protrude forward with respect to the leveling frame 7 and is not easily disturbed during operation. In addition, a rotational moment in the direction of arrow C ′ is generated as described above. As a result, the rotational moment in the direction of arrow C generated by the construction machine or the like riding on the position 8a on the platform 8, which is the normal work position, is offset, and the burden on the leveling cylinder device 9 can be reduced.
[0032]
More specifically, as shown in FIG. 4, the leveling cylinder device 9 is roughly composed of a cylinder 9 b and a piston 9 c having a rod 9 a, and the leveling frame 7 depends on a difference in oil pressure applied to the surface 9 d and the surface 9 e of the piston 9 c. For example, if the construction machine is at the position 8a on the platform 8 and the hydraulic oil tank 11 and the generator 13 are arranged below the position 8a, the rod 9a is moved to the arrow D in a normal use state. Continued to receive a large load for a long time because it was pulled strongly in the direction. Furthermore, in order to resist the tensile force, a large oil pressure must be applied to the surface 9d, but the surface 9d has a smaller area than the surface 9e by the amount of the rod 9a. The chamber 9f must be so high in hydraulic pressure.
[0033]
However, according to this embodiment, the rotational moment in the direction of arrow C of the leveling frame 7 generated by the construction machine or the like is partially or completely offset, so that the axial force acting on the rod 9a in a normal use state is so large. In addition, even if the construction machine is on the position 8a, the platform 8 turns horizontally by 180 degrees, and the construction machine is located above the hydraulic oil tank 11 and the generator 13, all of which rotate in the direction of arrow C '. Even if a moment is generated and the rod 9a is strongly pushed in the direction of the arrow D ', the oil pressure is applied to the surface 9e having a relatively large area to resist the force. It is not necessary to apply a very high oil pressure to 9g.
[0034]
In addition, this invention is not restricted to the form mentioned above, Even if there exists a change etc. which do not deviate from the summary of invention. For example, in the above embodiment, the hydraulic oil tank 11 is disposed on the leveling frame 7. However, if it is a pressurized tank or the like, it is not necessary to maintain a fixed posture, so it can be provided at the tip of the boom 5.
[0035]
Further, an electric motor may be used as the turning actuator without using a hydraulic turning device. At this time, the generator 13 can also be used as a power source for driving the electric motor.
[0036]
Furthermore, the leveling frame 7 may be provided directly at the tip of the telescopic boom 14 without using the jib 15.
[0037]
【The invention's effect】
As described above, according to the high office work vehicle platform part structure of the present invention, a device for or for construction machinery drive actuator drive so as to be positioned below the platform, and at least partially boom lodging Since it is arranged on the posture maintenance member so that it overlaps the boom when viewed from the side, the working space on the platform can be maintained while the drive device is close to the actuator and construction machine, and the platform height when the boom is collapsed Can also be suppressed. In addition, since the load weight of the platform does not change due to such an arrangement of devices, the burden on the turning actuator does not increase, and the device is located below the platform, so it is difficult to get in the way during work.
[0038]
Further , according to the platform structure of an aerial work vehicle of the present invention, the component device that needs to maintain a constant posture is arranged on the posture maintaining member that maintains the ground posture. It can be maintained in the same manner as when it is provided.
[0039]
Furthermore, according to the platform part structure of an aerial work vehicle of the present invention, the component equipment that does not need to maintain a constant posture is disposed at the tip of the boom, so that the support of the component device has a greater load than the posture maintenance member. It is entrusted to the supportable boom, so that the weight of the posture maintaining member can be suppressed, and the load on the leveling actuator can be reduced.
[0040]
And according to the platform part structure of an aerial work vehicle of the present invention , each component device is arranged separately on one side of the boom and the other side, so that the posture maintaining member or the tip of the boom Can be distributed, improving the weight balance and reducing the torsional load of the boom. In addition, since a single unit is smaller than in the case of concentrated arrangement, for example, when component devices are arranged on both the posture maintaining member and the boom tip, it is easy to avoid interference between the two, It is easy to suppress the protruding amount to the side.
[0041]
In addition, according to the platform structure of an aerial work vehicle of the present invention , the drive device is arranged on the base end side of the boom from the front end of the posture maintaining member, so that the device protrudes forward with respect to the posture maintaining member. For example, multiple workers and heavy construction machines are located at the normal work position on the platform that is opposite to the base end of the boom with respect to the swing fulcrum. When riding, the rotational moment of the posture maintaining member within the undulation trajectory plane caused by these can be partially or entirely offset by the rotational moment by the device, and the burden on the leveling actuator can be reduced.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows a boom type work vehicle having a platform structure according to the present invention, wherein (a) is a plan view and (b) is a side view.
2A and 2B show a platform structure according to the present invention, in which FIG. 2A is a side view and FIG. 2B is a rear view.
FIG. 3 is an enlarged side view of the leveling frame and platform of FIG. 2;
FIG. 4 is an enlarged cross-sectional side view of a leveling cylinder device.
[Explanation of symbols]
5 Boom 7 Leveling frame (Attitude maintenance member)
8 Platform 9 Leveling cylinder device (leveling actuator)
13 Generator (Equipment required for driving construction machines)

Claims (4)

An attitude maintaining member provided at the tip of a boom that can be raised and lowered on a vehicle so as to be able to swing within the hoisting locus plane of the boom, and swinging and driving the attitude maintaining member to change the ground attitude of the attitude maintaining member to the hoisting angle of the boom Regardless of the leveling actuator, a platform provided on the upper portion of the posture maintaining member so as to be able to turn horizontally, and a turning actuator for turning the platform, and the turning center of the platform is seen in a plan view. In an aerial work platform located on the platform floor,
Among a plurality of component devices necessary for driving the leveling actuator or the turning actuator or a plurality of component devices necessary for driving a construction machine used on the platform, it is necessary to maintain a certain posture . An aerial work vehicle characterized in that it is disposed on the posture maintaining member so as to be positioned below the platform and so that at least a part thereof overlaps the boom in a side view when the boom is lying down. Platform part structure. 2. The platform structure for an aerial work vehicle according to claim 1, wherein among the plurality of component devices , one that does not need to maintain a constant posture is disposed at a tip portion of the boom. 3. The aerial work vehicle according to claim 1, wherein the component devices of the plurality of component devices are distributed and arranged on one side surface and another side surface of the boom. Platform part structure. The platform part structure for an aerial work vehicle according to any one of claims 1 to 3 , wherein the component device is arranged closer to a base end side of the boom than a front end of the posture maintaining member.

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