JP2004115232A - Safety device for high lift work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device for a high lift work vehicle that solves the problem wherein withdrawal operation takes time due to the difficulty in the operation for withdrawing a work platform 6 of the high lift work vehicle positioned in a restricted zone S to a safety side. <P>SOLUTION: This safety device for high lift work vehicle is provided with: a first determining means 38 which determines that the work platform 6 is positioned in the prescribed restricted zone S in response to signals from a work platform position detection means 31 and a prescribed restricted zone storage means 37 when the work platform 6 is positioned in the restricted zone S; a restriction means 39 which restricts the operation of the work platform when the first determining means 38 determines that the work platform 6 is positioned in the prescribed restricted zone S; a second determining means 40 which determines that the operation direction of a horizontal operation means 24 is not directed to the prescribed restricted zone S; and a releasing means 41 which releases the restriction of the restriction means 39 when the second determining means 40 determines that the horizontal operation means 24 is not directed to the prescribed restricted zone S. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a safety device for an aerial work vehicle.
[0002]
[Prior art]
In this type of aerial work vehicle, as shown in FIG. 4, a swivel base 2 is arranged so as to be able to turn on a vehicle 1, and a telescopic boom 3 is arranged so that the swivel base 2 can be raised and lowered. The telescopic boom 3 has an intermediate boom 3b inserted into the base boom 3a and a leading boom 3c inserted into the intermediate boom 3b so as to be able to expand and contract sequentially. An undulating hydraulic cylinder 4 for driving the telescopic boom 3 up and down is arranged between the base boom 3a and the swivel base 2 at appropriate positions. At the distal end of the telescopic boom 3, a vertical maintaining member 5 is arranged by a vertical maintaining device so as to always maintain a vertical posture regardless of the up-and-down movement of the telescopic boom 3. A work table 6 is arranged on the vertical maintaining member 5 so as to be able to swing and drive. On the work table 6, operation levers 7, 7,... For driving each driving means are arranged. Are arranged on the front, rear, left and right sides of the vehicle 1, respectively, and the jacks 8, 8,... Protrude laterally from the vehicle width at the time of work to stably support the vehicle, and are stored in the vehicle width when the vehicle travels. Like that.
[0003]
In such an aerial work vehicle, an operator operating the operation levers 7, 7,... Drives the respective driving means to position the worktable 6 at a desired height, and Work at higher places.
[0004]
By the way, there are many work sites where such an aerial work vehicle is installed near a road on a general road. Therefore, as shown in FIG. 3, a restricted area S is provided along the side edge of the vehicle, and the workbench 6 does not protrude from the restricted area S and travels on the side of the installed aerial work vehicle. 2. Description of the Related Art Safety devices for aerial work vehicles that prevent contact with vehicles are known. (For example, JP-A-2001-180900)
[0005]
[Reference number 1]
JP 2001-180900 A
[Problems to be solved by the invention]
However, since the operation for detaching the work table 6 to the safe side from the state where the work table 6 is located in the regulation area S is difficult for the operator who boarded the work table 6 to understand, it has been time-consuming to detach the work table 6. For example, as shown in FIG. 3, when the work table 6 is positioned in the regulation area S in a state where the swing center of the work table 6 is close to the turning center of the expandable boom 3 in plan view, the telescopic boom 3 is moved to the right. Even if the user turns or turns left, the worktable 6 is further moved into the restricted area S, so that the turning movement of the telescopic boom 3 is restricted. Similarly, even if the worktable 6 is swung in both the left and right directions, the worktable 6 is further moved into the restricted area S, so that the swing of the worktable 6 is restricted. The extension movement and the fall movement of the telescopic boom 3 are also regulated because the worktable 6 moves into the regulation area S. The operations that are not restricted in this case are only the contraction movement of the telescopic boom 3 and the raising movement of the telescopic boom 3, and the work table 6 must be released from the state where the worktable 6 is located in the restriction area S by these two operations. As described above, the operator who has boarded the worktable 6 may not be able to quickly determine and operate the operation for detaching the worktable 6 from the state where the worktable 6 is located in the regulation area S, and may be troublesome.
[0007]
The present invention provides a safety device for an aerial work vehicle that can quickly determine and operate an operation for detaching the worktable 6 from the state where the worktable 6 is located in the regulation area S to the safe side even in such a case. Aim.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the safety device for an aerial work vehicle according to the first aspect of the present invention includes a telescopic boom arranged on the vehicle so as to be able to turn and undulate, and is capable of swinging at the tip of the telescopic boom. A horizontal operation means for operating the workbench horizontally when the workbench has a platform, a control means for horizontally moving the workbench in the operation direction based on an operation signal from the horizontal operation means, A workbench position detecting means for detecting the position of the workbench; a predetermined restriction area storage means for setting and storing a predetermined restriction area for the vehicle body; and a workbench receiving signals from the worktable position detection means and the predetermined restriction area storage means. First determining means for determining whether or not the workbench is located in a predetermined restricted area; and alarm means or a work means for issuing an alarm when the first determining means determines that the workbench is located in the predetermined restricted area. Regulate the operation of the table A safety device for an aerial work vehicle, comprising: a control device that receives an operation signal from the horizontal operation device and determines whether an operation direction of the horizontal operation device is a direction to a predetermined restriction area. A second determination unit, and a release unit that releases the warning of the warning unit or the restriction of the restriction unit when the operation direction of the horizontal operation unit is determined by the second determination unit to be not in the direction to the predetermined restriction area. It is characterized by having.
[0009]
The safety device for an aerial work vehicle according to claim 2 is the device according to claim 1, wherein the workbench position detection unit detects a turning angle, an up / down angle, a boom length, and a swing angle of the workbench of the telescopic boom, respectively. It is characterized in that the worktable position is calculated and detected based on a signal from each detector.
[0010]
According to a third aspect of the present invention, in the safety device for an aerial work vehicle according to the first aspect, the predetermined restriction area storage means is configured to store and set a restriction area in advance along a vehicle side edge or a vehicle front and rear edge. Is what you do.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a safety device for an aerial work vehicle according to the present invention will be described below with reference to FIGS. 1 and 2. In describing an embodiment of a safety device for an aerial work vehicle of the present invention, a case where the aerial work vehicle described in the related art is provided with the aerial work vehicle safety device of the present invention will be described below. Therefore, reference numerals 1 to 8 and reference numerals 3a to 3c used and described in the related art are the same, the same reference numerals are used, and detailed description is omitted.
[0012]
In FIG. 1, reference numeral 20 denotes an expansion / contraction operation means, which has an operation lever 7 and is an operation means for operating the operation lever 7 to extend / contract the telescopic boom 3. Reference numeral 21 denotes a raising / lowering operation means, which has the operation lever 7 and is an operation means for raising / lowering the telescopic boom 3 by operating the operation lever 7. Reference numeral 22 denotes a turning operation means which has the operation lever 7 and turns the turntable 2 by operating the operation lever 7. Reference numeral 23 denotes operating means for operating the operation lever 7 to swing the worktable 6. Reference numeral 24 denotes a horizontal operation unit having an operation lever 7 and operating the operation table 7 to horizontally move the worktable 6 in the operation direction. Reference numeral 25 denotes a vertical operation unit having the operation lever 7 and operating the operation lever 7 to vertically move the work table 6 in the operation direction.
[0013]
Reference numeral 26 denotes a control unit which receives a signal from each operation unit and outputs an operation signal to each drive unit described below based on the operation signal from each operation unit. Reference numeral 27 denotes a telescopic drive unit, which is a driving unit that drives and controls a telescopic hydraulic cylinder and the like (not shown) that expands and contracts the telescopic boom 3 based on an operation signal based on a telescopic operation from the control unit 26. Reference numeral 28 denotes an up-and-down driving unit, which is a driving unit that drives and controls the hydraulic cylinder 4 for raising and lowering the telescopic boom 3 based on an operation signal based on an up-down operation from the control unit 26. Reference numeral 29 denotes a turning drive unit that drives and controls a turning drive device (not shown) that turns the swivel base 2 based on an operation signal based on a turning operation from the control unit 26. Numeral 30 denotes a swing drive unit which drives and controls a swing drive unit (not shown) for swinging the worktable 6 based on an operation signal based on the swing operation from the control unit 26.
[0014]
The control means 26 outputs an operation signal corresponding to each operation means to each drive means. On the basis of signals from the horizontal operation means 24 and the vertical operation means 25, an operation direction based on the operation direction is determined. According to the operation amount, a control signal is output to a plurality of driving means as appropriate so that the worktable 6 is moved in the operation direction at a speed based on the operation amount.
[0015]
Reference numeral 31 denotes a workbench position detecting means, which is a means for detecting the position of the workbench 6, and includes the following respective detection means and arithmetic means. Reference numeral 32 denotes a turning angle detector which detects a turning angle of the turntable 2 with respect to the vehicle 1. Reference numeral 33 denotes an undulation angle detector which detects the undulation angle of the telescopic boom 3. Reference numeral 34 denotes a boom length detector, which detects the boom length of the telescopic boom 3. Numeral 35 denotes a swing angle detector which detects the swing angle of the worktable 6 attached to the vertical maintenance member 5 at the tip of the telescopic boom 3 so as to swing.
[0016]
The above detectors may also be used as detectors of other safety devices for aerial work vehicles.
[0017]
Reference numeral 36 denotes a workbench position calculating means, which receives signals from the detectors and calculates and calculates the position of the workbench 6. In particular, the workbench position calculating means 36 is used to determine whether or not a part of the workbench 6 is located in the restricted area described below. Is calculated and calculated.
[0018]
Reference numeral 37 denotes a predetermined restriction area storage unit which stores a predetermined restriction area S for the vehicle body 1, and stores, for example, an area S along a vehicle side edge as shown in FIG. In this case, the vicinity of a straight line connecting the jacks 8 projecting from the vehicle side in plan view is defined as the boundary L of the restriction area, and the space area separated from the vertical plane by the boundary L is stored as the restriction area S in advance. . In this restriction area, the allowable movement area of the worktable 6 is narrowed, but a space area separated from a vertical plane by the boundary line L 'is defined as a boundary line L' using a straight line along the vehicle side edge of the vehicle 1 as the restriction area S '. May be stored in advance.
[0019]
Numeral 38 denotes a first discriminating means, which receives the signal from the workbench position calculating means 36 of the workbench position detecting means 31 and the signal from the predetermined regulation area storage means 37, This is a means for determining whether or not it is located in the restriction area S. When the first determination means 38 determines that the worktable 6 is located in the predetermined restriction area S, it outputs a restriction signal to the restriction means 39 described below.
[0020]
Numeral 39 denotes a regulating means which is interposed in the middle of a circuit outputted from the control means 26 to each driving means and which is always in communication with the circuit, but which receives a regulation signal from the first discriminating means 38. This is a means for interrupting the circuit and preventing transmission of an output signal from the control means 26 to each drive means.
[0021]
Reference numeral 40 denotes a second determination unit which receives an operation signal from the horizontal operation unit 24 and determines whether the operation direction of the horizontal operation unit 24 is the direction toward the regulation area S. is there. When the operation direction of the horizontal operation unit 24 is determined to be the direction toward the restriction area S, the second determination unit 40 outputs a release signal to the release unit 41 described below.
[0022]
Reference numeral 41 denotes a release unit, which is provided in the middle of a circuit for outputting a restriction signal from the first determination unit 38 to the restriction unit 39, and which normally communicates with the circuit. When receiving the signal, the circuit is cut off, and the transmission of the regulation signal output from the first determination means 38 to the regulation means 39 is prevented.
[0023]
A is a controller, which receives signals from each of the detectors and each operating means, and receives the signals from the control means 26, the worktable position calculating means 36, the predetermined restricted area storing means 37, the first determining means 38, the restricting means. 39, each of which has the functions of a second determination means 40 and a release means 41, and outputs a signal to each drive means.
[0024]
The safety device for an aerial work vehicle according to the present invention configured as described above operates as follows. First, it is assumed that the worktable 6 is located in the regulation area S as shown in FIG. At this time, the workbench position calculating means 36 receives a signal from each detector and calculates and calculates the outermost edge position of the workbench 6 in the restricted area direction. The first determination means 36 receives signals from the worktable position calculation means 36 and the predetermined restriction area storage means 37 and determines whether or not the outermost edge position of the worktable 6 is located in the restriction area S. As shown in FIG. 3, since the work table 6 is located in the regulation area S, the first determination unit 36 outputs a regulation signal to the regulation unit 39. The regulating means 39 receives the regulation signal from the first discriminating means 36, shuts off the circuit, and prevents transmission of an output signal from the control means 26 to each driving means. Therefore, at this time, the output signal based on each operation means output from the control means 26 by operating each operation means is blocked by the restriction means 39 and not transmitted to each drive means, and the operation by each operation means is restricted. Is done.
[0025]
Here, in order to disengage the worktable 6 from the state where the worktable 6 is located in the regulation area S to the safe side, the horizontal operation means 24 is operated in a direction away from the regulation area S. Then, the second determination unit 40 determines that the operation signal from the horizontal operation unit 24 is not in the direction to the restriction area S, and outputs a release signal to the release unit 41. The release unit 41 receives the release signal from the second determination unit 40, shuts off the circuit, and prevents the restriction signal from the first determination unit 38 from being output to the restriction unit 39. Therefore, in the operation of the horizontal operation unit 24 in the direction away from the regulation area S, an output signal based on the operation direction is output from the control unit 26 to each drive unit as appropriate, and the worktable 6 moves in the direction operated by the horizontal operation unit 24. .
[0026]
Conversely, when the horizontal operation unit 24 performs an operation other than the direction away from the restriction area S, the second determination unit 40 determines that the operation signal from the horizontal operation unit is the direction to the restriction area S, and sends the release signal to the release unit 41. Do not output. Accordingly, the release unit 41 does not receive the release signal from the second determination unit 40, and outputs the restriction signal from the first determination unit 38 to the restriction unit 39 while keeping the circuit connected. Therefore, in the operation by the horizontal operation means 24 in a direction other than the direction away from the regulation area S, the output signal based on the operation direction from the control means 26 is blocked by the regulation means 39, and the work table 6 is moved by the regulation without being output to each drive means. I can't.
[0027]
As described above, when the work table 6 is moved to the safe side from the control area S in a state where the work table 6 is positioned in the control area S, the worker operates the horizontal operation unit 24 in the safe side direction to separate from the control area S. The above restriction can be released only by performing the above operation. In addition, since the operation is performed in the safe direction by the horizontal operation, the operator can quickly determine and operate the operation for detaching the worktable 6 from the state where the worktable 6 is located in the regulation area S to the safe side.
[0028]
In the above-described embodiment, the restriction region S is set along the vehicle side edge, but may be a previously set restriction region.
[0029]
Further, in the above embodiment, the operation of each operating means is regulated in a state where the worktable 6 is located in the regulation area S, and the horizontal operation means 24 is used to separate from the state located in the regulation area S to the safe side. Although the regulation is released only by the operation on the safe side, the same can be applied to the case where the operation is not restricted by the operation on the safe side which is separated from the restricted area S by each driving means. For example, in a state where the workbench 6 is located in the regulation area S as shown in FIG. 3, in addition to the horizontal operation to the safe side, the contraction operation of the telescopic boom 3, the raising operation of the telescopic boom 3, and the vertical operation are allowed. You may make it.
[0030]
Furthermore, in the above embodiment, the operation of the work table 6 is regulated when the work table 6 is located in the regulation area S. Also applicable to That is, when the control signal is received from the first discriminating means, an alarm is issued by the alarm means, and only when the horizontal operation means 24 is operated to disengage from the state of being located in the control area S to the safe side, the release means 41 is used. The restriction signal may be canceled to stop the alarm by the alarm means. With this configuration, when the worktable 6 is moved to the safe side where the work table 6 is located in the restricted area S and is separated from the restricted area S, the worker operates the horizontal operation unit 24 to move the safe side that is separated from the restricted area S. The alarm can be stopped only by operating in the direction, and by stopping the alarm, it can be known that the operation is on the safe side. In addition, since the operation is performed in the safe direction by the horizontal operation, the operator can quickly determine and operate the operation for detaching the worktable 6 from the state where the worktable 6 is located in the regulation area S to the safe side.
[0031]
Next, in the above-described embodiment, the predetermined restriction area is also stored in the storage means 37 as the restriction area S along the vehicle side edge, and the vicinity of a straight line connecting the jack 8 projecting from the vehicle side is set as the boundary line L of the restriction area. The space area separated from the vertical plane by L is stored in advance as the control area S. In addition, a plurality of control areas are stored, and the control area selection means 42 is arranged, and the control area selection is performed. Means 42 may be selected.
[0032]
Specifically, in addition to defining the space area separated from the boundary line L as the restriction area S, the space area separated from the vertical plane by the boundary line L 'is defined as the vehicle-side edge straight line as the boundary line L'. When the information is stored as the area S ′, or when four types of restriction areas in which the restriction area S and the restriction area S ′ are stored separately for the left and right are stored, a target restriction area may be selected from these restriction areas. Good. Alternatively, a restriction area along each of the front and rear edges of the vehicle may be stored, a total of six types of restriction areas may be stored, and a target restriction area may be selected from these restriction areas.
[0033]
That is, as shown in FIG. 2, the above-described six types of restriction areas are stored in the predetermined restriction area storage unit 37a, and when a selection signal is received from the restriction area selection unit 42, the selected restriction area is stored. This is different from the predetermined restriction area storage means 37 shown and described in FIG. 1 in that a signal is output to the first determination means 38. The workbench position detection means 31a includes a workbench position calculation means 36a. The workbench position calculation means 36a receives the signal of the restriction area selected from the predetermined restriction area storage means 37a, and receives the signal of the selected restriction area. This is different from the above-mentioned workbench position detecting means 36 in that the outermost edge position of the workbench in the area direction is calculated and calculated. Further, the second determination unit 40a receives the signal of the selected restriction area from the predetermined restriction area storage unit 37a, and determines whether the operation direction by the horizontal operation unit 24 is the operation direction to the restriction area. The second embodiment is different from the second determination unit 40 shown and described in FIG. 1 in that the operation direction of the horizontal operation unit 24 to the restricted area where the operation direction is selected is determined.
[0034]
Therefore, the controller B shown in FIG. 2 is different from the controller A shown in FIG. 1 in that the workbench position calculating means 36a of the workbench position detecting means 31a, the predetermined regulation area storage means 37a, and the second determination means 40a are different from each other. The other points are the same as those shown and described in FIG. Therefore, the controller B shown in FIG. 2 is different from the controller A shown in FIG. 1 only in that a plurality of stored restriction areas are processed in the selected restriction area. Since the operation of the embodiment shown in FIG. 1 can be easily understood without explanation, the explanation is omitted here. In the safety device for an aerial work vehicle configured as described above, the restricted area suitable for the work site can be selected by the restricted area selecting means 42 according to the work site. Degree of freedom can be increased.
[0035]
In the above-described embodiment, the restriction area selection means 42 is manually switched. However, for example, a plurality of restriction areas are stored along the vehicle side, and the selection from the plurality of restriction areas is performed by extending the jack 8. The width may be detected, and the restriction area may be automatically selected according to the overhang width of the jack 8.
[0036]
Further, in the above-described embodiment, the work platform position detecting means 31 is constituted by the detectors and the work platform position calculating means 36. However, the position of the vehicle body 1 is stored by GPS or the like, and the position of the work platform 6 with respect to the vehicle body 1 is measured. It may be configured to do so.
[0037]
【The invention's effect】
Since the safety device for an aerial work vehicle according to the present invention according to claim 1 is configured and operates as described above, the safety device for moving away from the restricted area with the workbench positioned in the restricted area is provided. The movement can be released by operating the horizontal operation means in the safe side direction to leave the restricted area. In addition, since the operation is performed in the safe direction in the horizontal operation, the operator can quickly determine and operate the operation for detaching the worktable from the state where the worktable is located in the restricted area to the safe side.
[0038]
According to a second aspect of the present invention, there is provided a safety device for an aerial work vehicle, wherein the position of the aerial work platform is calculated based on each detector and a signal from each of the detectors. In addition, the position of the workbench can be detected using the detector used for other safety devices.
[0039]
The safety device for an aerial work vehicle according to the third aspect of the present invention, in which the restriction area is set and stored in advance along the vehicle side edge or the vehicle front and rear edge, is more dangerous than the vehicle installed at the work site. Restricts the work table from jumping out to enable safe work.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a safety device for an aerial work vehicle according to the present invention.
FIG. 2 is a block diagram of another embodiment illustrating a safety device for an aerial work vehicle according to the present invention.
FIG. 3 is an explanatory diagram illustrating a state in which a workbench of the aerial work vehicle is positioned in a restricted area.
FIG. 4 is an explanatory diagram illustrating an aerial work vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle 3 Telescopic boom 6 Workbench 24 Horizontal operating means 26 Control means 31 Workbench position detecting means 31a Workbench position detecting means 37 Predetermined restricted area storage means 37a Predetermined restricted area storage means 38 First discriminating means 39 Restricting means 40 Second Discriminating means 40a second discriminating means 41 releasing means 42 regulating area selecting means

Claims (3)

A horizontal operation means for arranging the telescopic boom so as to be able to turn and raise and lower on the vehicle, and operating the work table horizontally when moving the work table horizontally to an aerial work vehicle equipped with a work table capable of swinging at the tip of the telescopic boom, Control means for horizontally moving the workbench in the operation direction based on an operation signal from the horizontal operation means, workbench position detection means for detecting the position of the workbench with respect to the vehicle body, and a predetermined storage area for setting and storing a predetermined restriction area for the vehicle body Restricted area storing means, first determining means for receiving a signal from the workbench position detecting means and a predetermined restricted area storing means to determine whether or not the workbench is located in a predetermined restricted area, and first determining means A safety device for an aerial work vehicle, comprising: a warning means that warns when the workbench is located in the predetermined regulation area or a regulation means that regulates the operation of the workbench,
A second determination unit that receives an operation signal from the horizontal operation unit and determines whether an operation direction of the horizontal operation unit is a direction to a predetermined regulation area; and an operation direction of the horizontal operation unit that is determined by the second determination unit. A safety device for an aerial work vehicle, comprising: release means for releasing the warning of the warning means or the restriction of the restriction means when it is determined that the direction is not the direction to the predetermined restriction area. The workbench position detecting means is configured to detect a swing angle, an up / down angle, a boom length, and a swing angle of the workbench of the telescopic boom, respectively, and calculate and detect the workbench position by a signal from each detector. The safety device for an aerial work vehicle according to claim 1, wherein: 2. The safety device for an aerial work vehicle according to claim 1, wherein the predetermined restriction area storage means is configured to set and store a restriction area in advance along a vehicle side edge or a vehicle front and rear edge.

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