JP2001335292A - High lift work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high lift work vehicle which is simple in constitution and can use either the operation from a driver's seat or the operation from a gondola. SOLUTION: In this high lift work vehicle comprising a traveling vehicle body (2), the gondola (7) supported in the vertically and horizontally movable manner via a plurality of booms (4, 5 and 6), a main operation device (16) mounted on the traveling vehicle body (2) for operating the gondola (7), and a sub operation device (10) mounted on the gondola (7) for operating the gondola (7), a switching device (36) capable of operating either of the main operation device (16) or the sub operation device (10) is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle provided with a work floor for a worker.

[0002]

2. Description of the Related Art Conventionally, there has been known an aerial work vehicle for performing work such as checking a wall of an aerial work by placing an operator on a work floor, and is disclosed in, for example, Japanese Patent Publication No. 7-33239. ing. FIG. 3 illustrates an aerial work vehicle according to the related art, and the related art will be described below with reference to FIG. 3. In FIG. 3, the aerial work vehicle 1 is provided with a swivel 3 on a traveling vehicle body 2 that can be swiveled by a swivel drive unit. Then, the base end of the first boom 4 is attached to the swivel base 3 so as to be able to move up and down by means of the up / down driving means 8, and the second end is attached to the tip end of the first boom 4.
The base end of the boom 5 is attached to bend freely by a bending drive means 9. A base end portion of a third boom 6 in which a plurality of single booms can be telescopically extended and retracted by telescopic driving means is attached to a distal end portion of the second boom 5 so as to be swingable by vertical driving means 11. Have been. At the tip of the third boom 6, a work floor 7 for riding a work vehicle is provided.
(In the publication, a bucket) is rotatably mounted by a rotation driving means.

[0003] Further, such an aerial work vehicle 1 includes a swivel 3
Turn angle detector for detecting the turn angle of the first boom 4 with respect to the traveling vehicle body 2, first boom angle detector for detecting the undulation angle of the first boom 4, and bending angle of the second boom 5 with respect to the first boom 4 A second boom bending angle detector for detecting the length of the second boom, a third boom expansion / contraction length detector for detecting the expansion / contraction length of the third boom 6,
A work floor rotation angle detector for detecting a rotation angle of the work floor 7 with respect to the third boom 6. Then, based on the movement of the sub operation lever 10 provided on the work floor 7 and the signals of these detectors, the above-mentioned respective driving means are driven so as to move the work floor 7 in a horizontal plane, for example.

[0004]

However, the prior art disclosed in Japanese Patent Publication No. 7-33239 includes the following.
There are the following problems.

That is, when using such an aerial work vehicle 1 to inspect, for example, the outer surface 38A of the soundproof wall 38 of an elevated road, the traveling vehicle body 2 is first stopped inside the soundproof wall 38. Then, the driver drives each of the driving means 13 by an operation lever or the like provided on the driver's seat 15 on the swivel 3 to make the work floor 7 face the outer side surface 38 </ b> A of the soundproof wall 38. After that, the worker operates the sub operation lever 10 while watching the work floor 7 and the state of the obstacle from inside the work floor 7,
The work floor 7 is moved to the work site.

As described above, the worker and the driver are often invisible from each other. For this reason, it is conceivable that both operators operate the operation levers simultaneously, such as the operator moving the sub operation lever 10 before the driver faces the outside surface of the work floor 7, and according to the related art,
In such a case, it is not clear how the work floor 7 moves. Therefore, even if the operator on the work floor 7 operates the sub operation lever 10, a desired result may not be produced, and the operability is reduced.

There is also a technique in which a hydraulic circuit is configured so that, when a worker and a driver simultaneously move their respective operation levers, the movement of one of the operation levers is prioritized. However, this complicates the structure of the hydraulic circuit. Further, a time lag occurs due to the movement of the operation lever due to the switching of the hydraulic circuit, and the operability is reduced.

The present invention has been made in view of the above problems, and has a simple structure, and can be used only in one of an operation from a driver's seat and an operation from a work floor. It is intended to provide.

[0009]

In order to achieve the above object, only one of the main operating device on the traveling vehicle side and the sub operating device on the working floor side of the aerial work vehicle is required. It is preferable that a switching device that can be operated is provided on the traveling vehicle body. Accordingly, one operation is reliably shut off by the switching device, and only the other operation is enabled. Therefore, even if the operation levers are simultaneously operated, the work floor does not move undesirably, and the operability is improved. . At this time, it is more preferable that the switching by the switching device is notified to the work floor side. Thus, the operator can always know whether the sub-operation lever on his side is valid or invalid, and the operability of the operation lever is improved.

In the aerial work vehicle, a changeover switch, a main pilot valve that generates a main pilot hydraulic pressure based on the movement of the main operating device, and a sub pilot that generates a sub pilot hydraulic pressure based on the movement of the sub operating device are provided. A main unload valve for unloading the main pilot source hydraulic pressure of the main pilot valve, or a sub unload valve for unloading the sub pilot pilot hydraulic pressure of the sub pilot valve, based on the instruction of the changeover switch. You may want to unload one. With this, when only one of the operation levers is made effective, the operation is performed by unloading the pilot source oil pressure of the other pilot valve, so that the configuration of the hydraulic circuit is simple, and only one of them is effectively made effective. it can.

Further, in a high-altitude work vehicle, a main valve for driving a work floor is driven via a main pilot valve based on an operation of a main operation device on a traveling body side, and a main operation valve is operated from a sub-operation device on the work floor side. The operation signal is transmitted to the controller in the cabin of the traveling vehicle body by communication, and the controller in the cabin receives the signal and drives the main valve via an electromagnetic sub-pilot valve. One of a main unload valve and a sub unload valve for unloading the pilot source hydraulic pressure of the main pilot valve and the sub pilot valve, respectively, based on an instruction of a changeover switch that specifies which of the devices is valid. Should be unloaded. Since the movement of the main operation lever is transmitted to the main valve by a mechanical hydraulic device, the configuration is simple and the operability is good. Further, since the movement of the sub operation lever is transmitted to the controller in the cabin on the traveling vehicle body by the signal line, there is no need to connect the sub operation device and the main valve with a hydraulic pipe or the like. Therefore,
The configuration of the piping is simplified, and removal is easy when transporting the work floor.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment according to the present invention will be described in detail with reference to the drawings. In the embodiments, the same elements as those in the drawings used in the description of the related art are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a structural view of an aerial work vehicle according to the embodiment. In FIG. 1, an aerial work vehicle 1 includes a swivel 3 that is provided on a traveling vehicle body 2 and that is reversibly swingable by a swing drive unit (not shown) using a planetary gear driven by, for example, a hydraulic motor. And this swivel 3
The base end of the first boom 4 is mounted so as to be able to be raised and lowered so that the first boom 4 can be raised and lowered in a vertical plane with respect to the boom mounting portion by means of a raising and lowering drive means 8 such as a telescopic cylinder. Further, the base end of the second boom 5 is attached to the distal end of the first boom 4 in a freely bendable manner, and the second boom 5 is moved in the up-and-down surface of the first boom 4 by bending drive means 9 such as a telescopic cylinder. So that it can be bent. Second boom 5
Has a telescopic shape, for example, two single booms extending in a telescopic manner, and is provided with a second boom expansion / contraction drive unit (not shown).

At the distal end of the second boom 5, for example, a base end of a third boom 6, which is made up of three single booms extending in a telescopic manner and is extendable, is attached swingably. For example, it can be expanded and contracted by a third boom expansion and contraction drive unit such as a winding winch (not shown). The third boom 6 is held in a vertical posture by a vertical drive unit 11 such as a level cylinder provided between the base end boom of the third boom 6 and the distal end of the second boom 5. I have. A work floor 7 for mounting a work vehicle is rotatably attached to a distal end portion of the third boom 6, and the work floor 7 is configured to be rotated by rotation driving means 12 such as a gear motor.

FIG. 2 shows a system chart of the aerial work vehicle 1. As shown in FIG.
Is provided with respective main valves 14 for driving the respective driving means 13 (represented by hydraulic cylinders in FIG. 2). The driver's seat 15 mounted on the swivel 3 is provided with a main operating device including a plurality of main operating levers 16 for operating the respective driving means 13. The movement of each main operation lever 16 is transmitted to each mechanical main pilot valve 17, and the main pilot oil pressure passing through each main pilot valve 17 is applied to each main hydraulic pipe 1.
8 to each main valve 14. At this time, the main pilot source hydraulic pipe 34 for supplying the main pilot source hydraulic pressure to each main pilot valve 17 is provided with an electromagnetic main unload valve 19 for unloading the main pilot source hydraulic pressure.

The aerial work vehicle 1 includes a work floor movement control device for moving the work floor 7 linearly in a horizontal or vertical direction. As shown in FIG. 2, the work floor movement control device includes a sub operation lever 10 and a sub controller 2 that converts an operation of the sub operation lever 10 into an electric operation signal.
In the vicinity of the sub-operating lever 10, there is provided a notifying device 21 composed of 0, an LED or the like, and notifying the operator of the validity / invalidity of the sub-operating lever 10. The sub-controller 20 transmits the operation signal to the in-cabin controller 37 provided in the cab using the communication line 22 or wireless communication. The work floor movement control device includes a swivel turn angle detector 23 for detecting a swivel angle of the swivel 3 with respect to the traveling vehicle body 2.
A first boom undulation angle detector 24 for detecting an undulation angle of the first boom 4, a second boom bending angle detector 25 for detecting a bending angle of the second boom 5 with respect to the first boom 4, A second boom telescopic length detector 26 that detects the telescopic length of the second boom 5, a third boom telescopic length detector 27 that detects the telescopic length of the third boom 6, and a third boom of the work floor 7 Work floor rotation angle detector 29 for detecting the rotation angle with respect to the second boom 6 and third boom tilt angle detector 2 for detecting the tilt angle of the third boom
8 is provided. Each of these detectors 23 to 29 outputs a detection signal to the in-cabin controller 37.

The in-cabin controller 37 receives an operation signal based on the operation of the sub-operation lever 10 from the sub-controller 20, and drives each electromagnetic proportional control type sub-pilot valve 30 based on the operation signal to perform the operation. The floor 7 is moved. Each sub pilot valve 30
Are transmitted to the respective main valves 14 via the sub-hydraulic piping 31. At this time, for example, when the work floor 7 is moved in the horizontal linear direction, the controller 37 in the cabin sets the
２９29 and the operation signal are calculated. Then, a drive signal is transmitted to each of the sub-pilot valves 30 so that the movement of the work floor 7 coincides with the movement of the sub-operation lever 10, so that the respective driving means 13 are driven simultaneously. The sub-pilot source hydraulic line 35 that supplies the sub-pilot source hydraulic pressure to each sub-pilot valve 30 is provided with an electromagnetic sub-unload valve 33 that unloads the sub-pilot source hydraulic pressure. The main hydraulic line 18 and the sub hydraulic line 31
To join.

A changeover switch 36 for selecting which of the main operation lever 16 and the sub operation lever 10 is valid is connected to the in-cabin controller 37. The in-cabin controller 37 transmits a selection signal to either the main unload valve 19 or the sub unload valve 33 based on the instruction of the changeover switch 36, and unloads the invalidated unload valve. As a result, only one of the pilot hydraulic pressures is applied to the main valve 14, and only one of the operation levers becomes effective. Further, the cabin controller 37 transmits to the sub-controller 20 a valid signal indicating which operation lever is valid. Based on this, the sub-controller 20 notifies the operator of which operation lever is valid by the notifying device 21 such as turning on an LED when the sub-operation lever 10 is valid.

As described above, according to the present embodiment, one of the sub operation lever 10 on the work floor 7 and the main operation lever 16 on the driver's seat 15 makes one of them effective.
A changeover switch 36 for invalidating the other is provided. Thereby, even when the sub operation lever 10 and the main operation lever 16 are simultaneously operated, each drive means 13 follows only the instruction of one of the operation levers, so that operability is improved and operation errors are reduced. . The changeover switch 36 is provided on the cab side. As described above, in the normal work procedure, first, the work floor 7 is roughly faced to the work surface from the driver's seat 15 by the main operation lever 16 or the like, and the sub-operation lever 10 is operated from inside the work floor 7 so that the work floor 7 is moved. Move to the work area. Therefore, it is natural for the driver to switch the changeover switch 36 after completing the work and to notify the worker of the change as a work flow. Also,
If a problem occurs in the movement of the sub operation lever 10 or each drive means 13 and the operation from the sub operation lever 10 is not as desired, the driver operates the main operation lever 16.
Is effective, and the work floor 7 can be collected or operated from the driver side. Further, for example, when the changeover switch 36 breaks down during the work, the repair can be easily performed on the driver's seat 15 side, whereas the work floor 7 needs to be collected once on the work floor 7 side.

Further, there is provided a notifying device 21 for notifying the state of the changeover switch 36 to the work floor 7 side. Thereby, the worker on the work floor 7 side can always know whether the sub operation lever 10 on his side is valid or invalid.
In the case of invalidity, the sub operation lever 10 is not moved,
Operability is improved. In addition, the movement of the main operation lever 16 drives the main valve 14 via the main pilot valve 17. That is, since the actuator is driven by hydraulic pressure, the responsiveness of the operation is good.

Further, there are provided a main unload valve 19 and a sub unload valve 33 for unloading the pilot source hydraulic pressure of the main pilot valve 17 and the sub pilot valve 30, respectively. The in-cabin controller 37 opens or closes one of them based on the instruction of the changeover switch 36, thereby enabling only the main or sub operation lever.
Thus, the operation lever on one side can be disabled with a simple configuration. Further, since the hydraulic circuit is controlled to disable one operating lever, one operating lever can be reliably disabled, and even if both operating levers are operated at the same time, each of the driving means 13 may move undesirably. Never do. Further, since the pilot source hydraulic pressure is unloaded, the validity / invalidity of the operation lever is quickly switched, and the operability is improved without a time lag. At this time, if the selection signal transmitted from the in-cabin controller 37 to the unload valves 19 and 33 is not transmitted due to disconnection or the like, the driver's seat 1
It is preferable to set the main operation lever 16 on the fifth side to be effective. Thereby, even when the changeover switch 36 becomes ineffective, it is possible to operate or collect the work floor 7 by operating from the driver's seat 15 side.

An operation signal of the sub operation lever 10 on the work floor 7 is transmitted to a controller 37 in a cabin provided in an operator's cab using the communication line 22. The means 13 is driven. Accordingly, there is no need to install a hydraulic pipe or a pilot valve for transmitting the operation state between the work floor 7 and the operator cab, and the connection is easy only by connecting with a signal line. In particular, since the work floor 7 is often transported separately from the traveling vehicle body 2 and connected at the work site, the connection at the work site is simplified, and the work efficiency is improved. At this time, if the operation signal and the valid signal of the changeover switch 36 are exchanged by serial communication,
The number of signal lines is small, and connection is simple.

[Brief description of the drawings]

FIG. 1 is a structural view of an aerial work vehicle 1 according to an embodiment.

FIG. 2 is a system chart of the aerial work vehicle 1.

FIG. 3 is a structural view of an aerial work vehicle 1 according to the related art.

[Explanation of symbols]

1: work platform, 2: running body, 3: swivel, 4: first
Boom, 5: second boom, 6: third boom, 7: work floor, 8: undulation drive means, 9: bending drive means, 10: sub operation lever, 11: vertical drive means, 12: rotation drive means, 13: each drive means, 14: main valve, 15: driver's seat, 16: main operation lever, 17: main pilot valve, 18: main hydraulic piping, 19: main unload valve, 20: sub controller, 21: notification device , 22: communication line, 23: swivel turning angle detector, 24:
First boom undulation angle detector, 25: Second boom bending angle detector, 26: Second boom extension length detector, 27: Third boom extension length detector, 28: Third boom tilt angle detector ,
29: work floor rotation angle detector, 30: sub pilot valve, 31: sub hydraulic line, 32: shuttle valve, 3
3: Sub unload valve, 34: Main pilot source hydraulic pipe, 35: Sub pilot source hydraulic pipe, 36: Changeover switch, 37: Cabin controller.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B66F 11/04 B66F 11/04

Claims (3)

[Claims] 1. A traveling vehicle body (2); a work floor (7) supported by the traveling vehicle body (2) via one or more booms (4, 5, 6); A main operating device (16) for operating the work floor (7) mounted on the work floor, and a sub operating device (10) for operating the work floor (7) mounted on the work floor (7). An aerial work vehicle, comprising: a switching device (36) capable of operating only one of a main operating device (16) and a sub operating device (10). 2. A traveling vehicle body (2); a work floor (7) supported on the traveling vehicle body (2) via one or more booms (4, 5, 6); A main operating device (16) for operating the work floor (7) mounted on the work floor, and a sub operating device (10) for operating the work floor (7) mounted on the work floor (7). In an aerial work vehicle, a changeover switch (36) for specifying whether to activate the main operation device (16) or the sub operation device (10), and the main pilot hydraulic pressure based on the movement of the main operation device (16). A main pilot valve (17) that generates sub-pilot pressure based on the movement of the sub-operating device (10), a sub-pilot valve (30) that generates sub-pilot oil pressure, and a changeover switch (36) activates the main operating device (16). Sub-unload valve (33) that unloads the sub-pilot source hydraulic pressure of the sub-pilot valve (30)
When the change-over switch (36) is in the position where the sub operating device (10) is enabled, the main unload valve (1) unloads the main pilot source hydraulic pressure of the main pilot valve (17).
9), wherein at least one of the main unload valve (19) and the sub unload valve (33) is unloaded based on an instruction of the changeover switch (36). 3. A traveling vehicle body (2); a work floor (7) supported by the traveling vehicle body (2) via one or more booms (4, 5, 6); A main operating device (16) for operating the work floor (7) mounted on the work floor, and a sub operating device (10) for operating the work floor (7) mounted on the work floor (7). In an aerial work vehicle, the in-cabin controller (3
7), a changeover switch (36) which is connected to the in-cabin controller (37) and specifies whether to activate the main operation device (16) or the sub operation device (10), and the main operation device (16) A main pilot valve (17) that generates a main pilot hydraulic pressure based on the movement of the main unload valve (17) that unloads the main pilot source hydraulic pressure of the main pilot valve (17) based on a command from a controller (37) in the cabin. 19) and a sub-controller (20) that converts the movement of the sub-operation device (10) into an operation signal and outputs it to the in-cabin controller (37)
A sub-pilot valve (30) that generates a sub-pilot oil pressure by a drive signal output from the in-cabin controller (37) based on an operation signal; and a sub-pilot valve (30) based on a command from the in-cabin controller (37). And a sub-unload valve (33) for unloading the sub-pilot source hydraulic pressure of the main unload valve (19) or the sub-unload valve (19) based on the instruction of the changeover switch (36). An aerial work vehicle characterized by unloading one of the load valves (33).