JP3872699B2 - Safety equipment for aerial work platforms - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety device for an aerial work vehicle having a configuration in which a work platform attached to a height moving means is moved to a desired position by operating a height moving means provided on a vehicle body.
[0002]
[Prior art]
The aerial work vehicle as described above has already been used, and an example is an aerial work vehicle called a bridge inspection vehicle or an overfence work vehicle. The bridge inspection car has a body that can be moved and moved, a boom that can be raised, lowered, expanded, and swiveled, a post that is pivotably pivoted up and down on the tip of the boom, and a vertical that is up and down on the tip of the post. And a work table pivotably pivoted. Workers get on the worktable and move the worktable by their own operation to perform work at a desired position, for example, repair / inspection of the side or lower part of the bridge, or repair / repair of the back side of the sound barrier Inspection work can be performed.
[0003]
Such work may be performed with a bridge inspection car parked on one side of a general road, in which case the work table protrudes from the road side different from the work direction so that it does not contact a passing car. Sufficient care is required for the operation of moving the work table. For this reason, in bridge inspection vehicles, safety measures can be considered to regulate the operation that causes the outermost edge of any of the boom, post, and workbench to move beyond the vehicle occupancy width on the road side opposite to the work direction during work. (Hereinafter referred to as “protrusion prohibition regulation”).
[0004]
[Problems to be solved by the invention]
By the way, if the above-described protrusion prohibition restriction is set by, for example, an operator turning on the switch, the protrusion prohibition restriction may not operate if the worker forgets to turn on the switch.
[0005]
In addition, as described above, it is possible to prevent the operator from forgetting to set the protrusion prohibition regulation by forgetting to turn on the switch, and at the same time, the protrusion can be applied to both the right and left work directions so that it can be handled in either the left or right work direction. When the prohibition restriction is set, the movable range of the boom, post, and workbench is narrowed, so that the operation of the boom, post, and workbench becomes difficult and the workability is lowered.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of such a problem, and is capable of reliably preventing the high place moving means and the work table from protruding to the roadway side and coming into contact with a passing vehicle without deteriorating workability. The object is to provide a safety device for work vehicles.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured such that a work platform is supported by a high place moving means (for example, the boom 5 and the post 10 in the present embodiment) disposed on a vehicle body, and the high place moving means. This is a safety device for an aerial work vehicle configured to move the work platform to a desired position by operating the jack, and is a jack that is provided on the front, rear, left, and right sides of the vehicle body and supports the vehicle body (for example, the roller jack 17 in this embodiment). A jack operating means (for example, a roller jack operating device 32 in the present embodiment) for performing the vertical expansion / contraction operation of the jack, and a jack operation actuator (for performing the vertical expansion / contraction operation of the jack in accordance with the operation of the jack operation means) For example, the jack cylinder 50) in this embodiment, Manually select the protrusion prohibition mode on the left or right side of the vehicle body Based on operating the protrusion prohibition switch Left or right side of the body of A protrusion prohibition region setting means for setting a predetermined protrusion prohibition region, a high place movement operation means for operating the high place movement means (for example, the upper operation device 30 and the lower operation device 31 in this embodiment), A high place moving actuator (for example, the boom actuator 65, the post actuator 75, and the work table actuator 85 in this embodiment) that operates the high place moving means in accordance with the operation of the place moving operation means, and the protrusion prohibition area setting means. Unless a protrusion prohibition region is set, a restricting unit (for example, an operation restricting unit 43 in the present embodiment) that performs control for restricting the operation of at least one of the jack operating actuator and the high position moving actuator is provided.
[0008]
In the safety device for an aerial work vehicle having such a configuration, unless the protrusion prohibition region is set to the left or right of the vehicle body by the protrusion prohibition setting means, in the operation operation of the jack and the operation actuator of the height movement actuator, Can't do at least one. For this reason, it is possible to easily and surely set the protrusion prohibition area without impairing workability, and it is possible to improve work safety in work in which movement of the work table is restricted to the side of the vehicle body.
[0009]
In addition, a safety device for an aerial work vehicle configured to support a work table by a high place moving means disposed on a vehicle body and configured to move the work table to a desired position by the operation of the high place moving means. It is provided on the front, rear, left and right of the vehicle body, and performs a vertical expansion operation and / or a lateral extension operation to support the vehicle body, and performs a vertical expansion operation and / or a lateral extension operation of the jack. Jack operating means, a jack operating actuator for performing a vertical expansion / contraction operation and / or a lateral extension operation of the jack according to the operation of the jack operation means, and the amount of extension of each jack to the side of the vehicle body Based on the information from the jack extension amount detecting means to be detected (for example, the jack extension amount sensor 90 in the present embodiment) and the jack extension amount detecting means, The direction of the vehicle body with a jack with a small overhang Prohibition area As A protruding prohibition area setting means to be set, a high place moving operation means for operating the high place moving means, and a high place moving actuator for operating the high place moving means in accordance with the operation of the high place moving operation means; A high place movement restricting means for controlling the operation of the high place moving means or the high place moving actuator such that the work table moves into the overhang prohibited area set by the overhang prohibited area setting means (for example, this implementation And an operation restricting portion 43) in the example.
[0010]
In the safety device having such a configuration, the area where the extension of the jack is small is automatically set to the side where the protrusion of the vehicle body is small, and the actuator for moving the high place is moved to the area where the protrusion is prohibited. To regulate. For this reason, it is possible to reliably set the protrusion prohibition region and improve the safety.
[0011]
Furthermore, a safety device for an aerial work vehicle configured to support a work table by a high place moving means disposed on a vehicle body and configured to move the work table to a desired position by the operation of the high place moving means. There, Manually select the protrusion prohibition mode on the left or right side of the vehicle body Based on operating the protrusion prohibition switch Left or right side of the body of A protrusion prohibition area setting means for setting a predetermined protrusion prohibition area, a high place movement operation means for operating the high place movement means, and an operation of the high place movement means according to the operation of the high place movement operation means. A high position moving actuator, an upper operating means (for example, the upper operating device 30 in the present embodiment) provided on the work table, and a lower operating means (for example, the lower operating device 31 in the present embodiment) provided on the vehicle body. Unless the protrusion prohibition area is set by the protrusion prohibition area setting means, control for restricting the operation of the high place moving actuator by the operation from the upper operation means is performed.
[0012]
In the safety device having such a configuration, the high-position moving actuator cannot be operated unless the protrusion prohibition area is set by the protrusion prohibition area means provided in the upper operation means provided on the work table. For this reason, work safety can be improved even when working from a workbench where it is difficult to confirm whether it protrudes beyond the vehicle width.
[0013]
The work table position detecting means (for example, the work table position sensor 80 in this embodiment) for detecting the height position of the work table is provided, and the high place movement restricting means is the work table detected by the work table position detecting means. If the height position is above the installation surface of the aerial work vehicle, the operation of the high place moving means or the high place moving actuator that moves the work place into the set out-prohibited area is restricted, and the work table When the height of the work platform detected by the position detection means is below the installation surface of the work vehicle at the height, the height movement such that the height movement means or work table moves into the set out-prohibited area It is preferable to perform control that permits operation of the actuator.
[0014]
In the safety device having such a configuration, when the work floor is above the installation surface of the aerial work vehicle, a protruding prohibition area is set, and the operation of the high position moving actuator that moves into the protruding prohibition area is restricted. However, when the work floor is below the installation surface of the aerial work vehicle, the operation is permitted such that the high place moving means or the work table moves into the protrusion prohibited area. For this reason, since the work table is moved downward from the road on the upper surface of the bridge and the work is performed in a posture in which collision with a general vehicle is not considered (so-called underbridge work), the protrusion prohibition is not performed. Workability can be improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a vehicle side view of a bridge inspection vehicle 1 as an example of an aerial work vehicle according to the present invention, and FIG. 3 shows a view of the bridge inspection vehicle 1 in a working state as viewed from the rear of the vehicle. The bridge inspection vehicle 1 has a driving cabin 2a in the front, and is configured based on a truck chassis that can travel on front and rear tire wheels 3a and 3b. A swivel base 4 is mounted on the vehicle body 2 behind the operation cabin 2a so as to project upward, and the swivel base 4 is turnably driven by a swivel motor 51 provided below the swivel base 4. A boom 5 is pivotally connected to the upper part of the swivel base 4, and is swung up and down by a hoisting cylinder 52 that stretches between the swivel base 4 and the boom 5. The boom 5 includes a base end boom 5 a pivoted to the swivel base 4 and a front end boom 5 b that is telescopically inserted into the base end boom 5 a, and an extendable cylinder 53 attached to the inside of the boom 5. It is configured to be extendable.
[0016]
A bending / extending post 6 is pivotally connected to the tip of the tip boom 5b so as to be swingable up and down, and a link arm 7 is pivotally connected to the swinging axis of the bending / extending post 6. A rod-side end of a post-leveling cylinder 54 is pivoted to the upper end of the link arm 7, and a bottom-side end of the cylinder 54 is pivoted into the tip boom 5b. Further, the rod side end of the post hoisting cylinder 55 is pivotally connected to the lower end of the link arm 7, and the bottom end of this cylinder is pivotally connected to the lower part of the bending / extending post 6. A post 10 is fixed to the front end of the bent post 6.
[0017]
The post hoisting cylinder 55 is expanded and contracted by an independent operation, and the bending post 6 swings up and down with respect to the link arm 7 and the tip boom 5b, and the post 10 can be set at a desired bending angle position. On the other hand, the bottom-side oil chamber of the post-leveling cylinder 54 and the rod-side oil chamber of the hoisting cylinder 52 are connected by an oil passage to constitute a so-called hydraulic circuit leveling mechanism, and the boom 5 is raised (falling down). When this occurs, the bending post 6 is tilted (raised) through the link arm 7 and the post hoisting cylinder 55 by the same angle as the hoisting angle of the boom 5, so that the post 10 is always operated regardless of the hoisting angle of the boom 5. Acts to maintain verticality.
[0018]
The post 10 includes a holder 10h fixed to the bending / extending post 6, and a first post 10a, a second post 10b, a third post 10c, and a fourth post 10d that are telescopically inserted into the holder 10h. The first to fourth posts 10 to 10d can be expanded and contracted with respect to the holder 10h by an elongating cylinder 56 stretched between the first post 10a and a chain loop disposed inside the post. It is configured. The arm 11 is pivotally connected to the tip of the fourth post 10d so as to be swingable in the direction in which the post extends (is swingable in the direction perpendicular to the paper surface in FIGS. 2 and 3). Driven by. Note that the turning operation (referred to as swinging) of the arm 11 is allowed only when the post 10 is in a horizontal state, and is specifically used when working at a high place or when storing the work table 20 in the vehicle body 2.
[0019]
A pivot base 12 is pivotally connected to the tip of the arm 11 so as to swing up and down, and a work table leveling cylinder 57 is stretched between the base end of the arm 11 and the upper end of the pivot base 12. Yes. The swivel base 12 is driven by a workbench swivel motor 58 with respect to the swivel base 12 and is pivotable. A base end portion is fixed to the lower end of the workbench bracket 13 so that the workbench bracket 13 A work table 20 is attached via a telescopic beam 14 that can extend and contract in a direction orthogonal to the pivot axis.
[0020]
The operation of the work table leveling cylinder 57 is controlled by a so-called electric leveling device. That is, the work table leveling cylinder 57 is controlled in its expansion and contraction operation based on the detection signal of the inclination detector provided on the work table 20, and the work leveling cylinder 57 is operated regardless of the undulation angle of the boom 5 or the bending angle of the post 10. Leveling control is performed so that the platform 20 is always kept horizontal (the worktable bracket 13 is always positioned so as to extend vertically). The specific operation is performed using hydraulic oil discharged from the hydraulic pump P, and the leveling device controls the operation of the electromagnetic control valve and supplies the hydraulic oil flow (supply) to the worktable leveling cylinder 57. Direction and flow rate). As a result, the work table 20 is always supported horizontally with respect to the swivel base 12 regardless of the undulation angle of the boom 5 and the bending / extension angle of the post 10 and is supported horizontally with respect to the swivel base 12.
[0021]
A work table 20 is attached so as to be expandable / reducible in the direction of the telescopic axis of the telescopic beam 14. The telescopic beam 14 is composed of a base end beam 14a whose base end is fixed to the worktable bracket 13, an intermediate beam 14b telescopically inserted into the base end boom 14a, and a front end beam 14c. The work table telescopic cylinder 59 disposed inside the beam 14 is expanded and contracted so that the intermediate beam 14b and the distal beam 14c can be expanded and contracted with respect to the proximal beam 14a.
[0022]
The work table 20 is provided with an upper operation device 30, and the vehicle body 2 is provided with a lower operation device 31. By operating these, the turn table 4 is turned in a desired direction, the boom 5 is raised and lowered, and the telescopic operation is performed. The bending post 6 can be moved up and down, the post 10 can be expanded and contracted, the worktable bracket 13 can be swung, the worktable 20 can be expanded and contracted.
[0023]
Roller jacks 17 that can be expanded and contracted in the left and right directions of the vehicle body 2 and that can be expanded and contracted in the vertical direction are provided at four locations on the vehicle body 2. The roller jack 17 has an outrigger 17a that can be expanded in the left-right direction of the vehicle body, a jack 17b that can be expanded and contracted in the vertical direction, and a roller 17c that is attached to the lower end portion of the jack 17b and can roll in the vehicle longitudinal direction. As shown in FIG. 3, the roller 17c is grounded on the road surface and the vehicle body is stably supported against a falling moment acting on the vehicle body, and the vehicle can be moved forward and backward. Yes. Using the roller jack 17, the vehicle can be moved back and forth while maintaining a constant boom posture so that the work can be performed.
[0024]
The vehicle body 2 is provided with a roller jack operating device 32, and by operating this, the outrigger 17a can be operated to extend in the left-right direction, and the jack 17b can be expanded and contracted in the up-down direction.
[0025]
In the bridge inspection vehicle 1 as described above, the upper operation device 30 and the driving cabin 2a are provided with a communication device including a microphone and a speaker. By communicating with each other through this communication device, the roller Since the work can be performed by moving the vehicle back and forth while maintaining a constant boom posture using the jack 17, when another worker performs the traveling operation of the vehicle body 2 from the driving cabin 2 a, An operator on the work table 20 can also perform repair / inspection work continuously over the entire bridge B.
[0026]
The safety device 100 provided in the bridge inspection vehicle 1 having such a configuration will be described. As shown in FIG. 1, the safety device 100 for an aerial work vehicle of the present invention includes an upper operating device 30, a lower operating device 31, a roller jack operating device 32, a protrusion prohibiting switch 33, a boom position sensor 60, A post position sensor 70, a work table position sensor 80, a jack extension sensor 90, a controller 40, a jack cylinder 50, a boom actuator 65, a post actuator 75, a work table actuator 85, and an alarm device 45 are provided. It has been.
[0027]
Since the upper operating device 30, the lower operating device 31, and the roller jack operating device 32 have been described above, description thereof is omitted here.
[0028]
The boom position sensor 60 includes a boom undulation angle sensor 61 that detects the undulation angle of the boom 5, a boom extension sensor 62 that detects the extension amount of the boom 5, and the turning angle of the swivel base 4 (that is, the turning angle of the boom 5). And a boom turning angle sensor 63 for detection.
[0029]
The post position sensor 70 includes a post undulation angle sensor 71 that detects a deflection angle of the post 10 with respect to the vertical axis, and a post extension sensor 72 that detects an extension amount of the post 10.
[0030]
The work table position sensor 80 includes a work table turning angle sensor 81 that detects the turning angle of the work table 20 and a work table extension sensor 82 that detects the extension amount of the work table 20.
[0031]
The jack extension sensor 90 includes a left front jack extension sensor 91, a left rear jack extension sensor 92, a right front jack extension sensor 93, and a right rear provided on each of the left front, left rear, right front, and right rear roller jacks 17. It comprises a jack extension sensor 94 and detects the amount of extension of each roller jack 17 to the side of the vehicle body 2.
[0032]
The protrusion prohibiting switch 33 is provided adjacent to the upper operating device 30 on the work table 20, and can set a vehicle body leftward protrusion prohibition mode or a vehicle body rightward protrusion prohibition mode. When the protrusion prohibiting switch 33 is operated, a setting signal is transmitted to the operation control unit 41 of the controller 40.
[0033]
The controller 40 includes an operation control unit 41, a position calculation unit 42, and an operation restriction unit 43.
[0034]
The operation control unit 41 does not accept the input of the operation signal from the roller jack operating device 32 unless the vehicle prohibition leftward protrusion prohibition mode or the vehicle body rightward protrusion prohibition mode is set by the protrusion prohibiting switch 33. For this reason, the operation of the roller jack 17 cannot be performed without setting the protrusion prohibition region. When the protrusion prohibiting switch 33 is set, first, an input of an operation signal from the roller jack operating device 32 is received, an operation signal is transmitted to the hydraulic control valve V in accordance with the operation signal, and the hydraulic control is performed in accordance with the operation signal. The valve V supplies and discharges hydraulic oil from the hydraulic pump P to the jack cylinder 50 and controls the operation of the jack cylinder 50.
[0035]
Then, the operation control unit 41 does not accept input of operation signals from the upper operation device 30 and the lower operation device 31 unless the extension of the roller jack 17 is completed. For this reason, the operation of the boom 5, the post 10, the work table 20, etc. cannot be performed without the roller jack 17 protruding (so-called jack interlock control). When the protrusion prohibiting switch 33 is operated and the extension of the roller jack 17 is completed, an operation signal from the upper operation device 30 and the lower operation device 31 is received, and an operation signal is transmitted to the hydraulic control valve V according to the operation signal. In response to this operation signal, the hydraulic control valve V supplies and discharges hydraulic oil from the hydraulic pump P to the boom actuator 65, the post actuator 75, and the worktable actuator 85, and controls the operation of the actuators 65, 75, and 85. . At the same time, when the extension of the roller jack 17 is completed, the operation control unit 41 transmits an extension completion signal to the operation regulating unit 43.
[0036]
The position calculation unit 42 determines the position of the tip of the boom 5 with respect to the vehicle body 2 based on the detection information from the boom position sensor 60 and the position of the tip of the post 10 with respect to the vehicle body 2 based on the detection information from the post position sensor 70. And the position of the outermost edge of the work table 20 with respect to the vehicle body 2 based on the detection information from the work table position sensor 80 and the position of each roller jack 17 with respect to the vehicle body 2 based on the detection information of the jack extension sensor 90. These information are calculated and transmitted to the operation restricting unit 43.
[0037]
When the operation regulating unit 43 receives the overhang completion signal of the roller jack 17 from the operation control unit 41, the operation restriction unit 43 sets a protrusion prohibition region based on the overhang completion signal and the information from the position calculation unit 43 described above. When the protrusion prohibiting switch 33 is manually operated and the vehicle body left protrusion prohibiting mode is set, the position of the left front roller jack 17 obtained based on the detection information from the left front jack protrusion amount sensor 91 and the jack extension A vertical plane S1 passing through a straight line connecting the position of the left rear roller jack 17 obtained based on the detection information from the output sensor 92 is set, and a left area from the vertical plane S1 is a left protrusion area. Set as M1. On the other hand, when the protrusion prohibiting switch 33 is manually operated to set the vehicle body rightward protrusion prohibiting mode, the position of the right front roller jack 17 obtained based on the detection information from the right front jack extension amount sensor 93, A vertical plane S2 passing through a straight line connecting the position of the right rear roller jack 17 obtained based on the detection information from the right rear jack extension amount sensor 94 is set, and a right area from the vertical plane S2 is Is set as a protrusion prohibition area M2.
[0038]
FIG. 4 shows an example of the positions of the roller jacks 17, the left protrusion prohibition area M 1 and the right protrusion prohibition area M 2 that can be set at this time, and the vertical surfaces S 1 and S 2 that are the limit surfaces of the protrusion prohibition areas M 1 and M 2. Is shown. As shown in FIG. 4, when the positions of the front and rear roller jacks 17 on the right side of the vehicle body 2 are the same, the limit surface (vertical surface S2) of the rightward protruding prohibition region M2 is parallel to the front and rear axis of the vehicle body. However, since the position of the front and rear jacks on the left side of the vehicle body is different between the front and the rear, the limit surface (vertical surface S1) of the left protrusion prohibition region M1 is set obliquely with respect to the front and rear axis of the vehicle body. .
[0039]
According to such a procedure, in a state in which the left protrusion prohibition region M1 or the right protrusion prohibition region M2 is set by the operation restricting unit 43, the height of the work table 20 is set higher than the position of the vehicle body 2 by the work table position sensor 80. When it is detected that the height is high, is the outermost edge of any of the boom 5, the post 10, and the work table 20 calculated as described above positioned within the set out prohibition area (M1 or M2)? When the outermost edge of any one of the boom 5, the post 10 and the work table 20 is located in the protrusion prohibition region (M1 or M2), an alarm device 45 provided in the upper operation device 30 is used. A control signal is transmitted to the operation control unit 41 at the same time as an alarm sound is emitted. In response to this restriction signal, the operation control unit 41 restricts the operation of the hydraulic control valve V, and the outermost edge of any of the boom 5, the post 10, and the work table 20 moves into the protrusion prohibition region (M1 or M2). In this direction, the boom 5 in the direction to be lifted, stretched, swiveled, and the post 10 lifted, stretched, extended, and extended, and swiveled are controlled.
[0040]
It should be noted that the above-described protrusion prohibition restriction is performed only for operations from the upper operation device 30 that is used in normal work and has a narrow work field of view, and is operated from the lower operation device 31 that is less frequently used and has a wide work field of view. May not be performed. Improve workability because work can be performed in a wider work range by not restricting the operation from the lower operation device 31 used in emergency (for example, at the time of failure) or inspection before starting work. Can do.
[0041]
Further, when it is detected that the height position of the work table 20 is lower than the position of the vehicle body 2 (the so-called underbridge work shown in FIG. 3), the highest position of any one of the boom 5, the post 10 and the work table 20 is detected. When the outer edge is located within the set out prohibition area (M1 or M2), a permission signal is transmitted to the operation control unit 41. In response to this permission signal, the operation control unit 41 controls the operation of the hydraulic control valve V, and the boom 5, the post 10, or the workbench 20 as shown in FIG. The boom 5 in the direction in which the outer edge moves into the protrusion prohibition region (M1 or M2) is allowed to be raised, retracted, swiveled, the post 10 lifted, extended, the work table 20 extended, and swiveled.
[0042]
In this way, the protrusion prohibiting switch 33 is manually operated to set the vehicle body left protrusion prohibition mode or the vehicle body right protrusion prohibition mode. Based on this setting, the vehicle body 2 left protrusion prohibition area M1 or the right protrusion prohibition area. M2 can be set. When the outermost edge of any one of the boom 5, the post 10, and the work table 20 is located in the left or right protrusion prohibited areas M1 and M2 set in this way, an alarm is issued by the alarm device 45. Therefore, the safety in the work in which the movement of the work table 20 to the side of the vehicle body 2 is restricted (for example, work under a bridge performed while parked on a general road, work in a tunnel) is improved. In addition, since the operation of moving the work table 20 is facilitated, workability is improved.
[0043]
In the above, the protrusion prohibition area is set by operating the protrusion prohibition switch. Instead of this, the extension of each roller jack 17 obtained based on the detection information from the jack extension amount sensor 90 is determined. By comparing the protruding amount, the direction in which the roller jack 17 having the smallest protruding amount is set as the protruding prohibited area side, and the protruding prohibited area M1 or M2 may be automatically set in the same manner as described above. For example, as shown in FIG. 5, when the protruding amounts of the roller jacks 17 are all different, the right side of the vehicle body with the roller jack 17 having the smallest protruding amount indicated by the symbol A is regarded as the direction in which the protruding prohibition region is set, A rightward protruding prohibition area M2 is set. By automatically setting the protrusion prohibition area in this way, workability is improved, and since the protrusion prohibition area is always set, safety can be improved.
[0044]
The safety device 100 for an aerial work vehicle according to the present invention has been described so far, but the present invention is not limited to the above. For example, although the bridge inspection vehicle has been described as an example in the above-described embodiment, the present invention can be applied to all boom working vehicles whose height moving means are other such as a crane and a boom. In addition, when the work platform is small and its size is not particularly problematic, instead of the position of the outermost edge of any of the boom 5, the post 10 and the work table 20 as in the above embodiment, the boom Only the position of the tip may be used.
[0045]
Further, the method of setting the protrusion prohibition areas M1 and M2 to the left or right of the vehicle body is not limited to that shown in the above embodiment. For example, in the above-described embodiment, the limit surfaces S1 and S2 of the protrusion prohibition areas M1 and M2 have been described so as to pass through the position of the roller jacks 17, but the inner side (the side closer to the center of the vehicle body 2) than the positions of the roller jacks 17. ) Or outside (the side far from the center of the vehicle body 2).
[0046]
A specific example using the safety device 70 for an aerial work vehicle will be described. In the bridge inspection vehicle 1 having the above-described configuration, when the work table 20 is moved to the lower surface of the bridge from the state stopped on the left side of the road as shown in FIG. Traveling operation is performed and the bridge inspection vehicle 1 is moved to the work site. The work table 20 is stored when traveling on the road. When arriving at the work site, as shown in FIG. 3, the vehicle body 2 is stopped in a direction parallel to the fence F (the construction direction of the bridge B), and the protrusion prohibition switch 33 is pressed to set the right protrusion prohibition mode. The vehicle body 2 is stabilized by overhanging the roller jacks 17 provided on the front, rear, left and right sides.
[0047]
Subsequently, an operator (not shown) gets on the work table 20 from the ground. An operator who has boarded the work table 20 manually operates the upper operation device 30 to perform the hoisting operation from the retracted state to the maximum, and then performs the extending operation. Then, after turning the worktable bracket 13 to the maximum with the bending post 6 and the boom 5 in parallel, the turntable 4 is turned to the fence F side, and the tip of the boom 5 is directly above the fence F. Move to nearby. Then, after raising and lowering the post 10 until it becomes vertical, the post 10 is extended downward and the work table 20 is lowered.
[0048]
When the work table 20 is located below the bridge B, the work table bracket 13 is swung to turn the work table 20, the work table 20 is positioned near the work object, and the telescopic beam 14 is extended. Spread the work table 20. At this time, even if the outermost edge of the work table 20 moves from the position of the reference symbol P to the position of the reference character Q as shown in FIG. 5 and is located in the rightward protrusion prohibition region M2 (vertical surface S1), the work table 20 is moved. It can be extended to a desired position, and necessary inspection work can be performed.
[0049]
【The invention's effect】
As described above, according to the safety device for an aerial work vehicle of the present invention, unless the protrusion prohibition setting means sets the protrusion prohibition area to the left or right of the vehicle body, the operation operation of the jack and the height moving actuator are performed. At least one of the operations cannot be performed. For this reason, it is possible to easily and surely set the protrusion prohibition area without impairing workability, and it is possible to improve work safety in work in which movement of the work table is restricted to the side of the vehicle body.
[0050]
Then, a protruding prohibition area to the side of the vehicle body is automatically set to the side where the extension width of the jack is small, and the operation of the high place moving actuator that moves into the protruding prohibition area is restricted. For this reason, it is possible to reliably set the protrusion prohibition region and improve the safety.
[0051]
Furthermore, it is preferable that the high-position moving actuator cannot be operated unless the protrusion prohibition area is set by the protrusion prohibition area means provided in the upper operation means provided on the work table. With such a configuration, safety can be improved even when working from a workbench where it is difficult to confirm whether it protrudes beyond the vehicle width.
[0052]
In addition, when the work floor is above the installation surface of an aerial work vehicle, a protrusion prohibition area is set, and the operation of the high altitude actuator that moves into the protrusion prohibition area is restricted. When it is below the installation surface of the work vehicle, it is preferable to permit the operation such that the high place moving means or the work table moves into the protrusion prohibition region. With this configuration, the work table is moved downward from the road on the top of the bridge and the work is performed in a posture that does not allow a collision with a general vehicle (so-called underbridge work). Since it is not performed, workability can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a safety device for an aerial work vehicle according to the present invention.
FIG. 2 is a side view of a bridge inspection vehicle which is an example of an aerial work vehicle equipped with the safety device.
FIG. 3 is a rear view of a bridge inspection vehicle which is an example of an aerial work vehicle equipped with the safety device.
FIG. 4 is a plan view showing a setting example of a left protrusion prohibition region and a right protrusion prohibition region.
FIG. 5 is a rear view of a bridge inspection vehicle equipped with the safety device, showing a state in which a work table is positioned below the bridge.
[Explanation of symbols]
1 aerial work vehicle
5 Boom (Moving means for high places)
10 Post (Moving means for high places)
20 workbench
30 Upper operation device (high altitude movement operation means, upper operation means)
31 Lower operation device (high altitude movement operation means, lower operation means)
32 Roller jack operation device (jack operation means)
33 Protrusion prohibition switch (protrusion prohibition area setting means)
41 Operation control unit
42 Position calculator
43 Operation restriction part (regulation means, altitude movement restriction means)
50 Jack cylinder (Jack actuator)
65 Boom actuator (high-movement actuator)
75 Post actuator
80 Work table position sensor (work table position detection means)
85 Bench actuator (high-movement actuator)
90 Jack extension amount sensor (jack extension amount detection means)
100 safety devices

Claims (4)

A safety device for an aerial work vehicle configured to support a work table by a high place moving means disposed on a vehicle body and configured to move the work table to a desired position by the operation of the high place moving means. There,
A jack provided on the front, rear, left and right of the vehicle body to support the vehicle body;
Jack operating means for performing vertical expansion and contraction operation of the jack;
A jack actuating actuator that causes the jack to be vertically expanded and contracted in accordance with an operation of the jack operating means;
A protrusion prohibition area setting means for setting a predetermined protrusion prohibition area on the left or right side of the vehicle body based on operating a protrusion prohibition switch for manually selecting a protrusion prohibition mode for the left or right of the vehicle body; ,
Altitude moving operation means for operating the altitude moving means;
An altitude moving actuator for operating the altitude moving means in response to an operation of the altitude moving operation means;
A high place, comprising: a restricting means for controlling the operation of at least one of the jack actuating actuator and the high place moving actuator unless the sticking out prohibition area is set by the sticking out prohibition area setting means. Work vehicle safety device. A safety device for an aerial work vehicle configured to support a work table by a high place moving means disposed on a vehicle body and configured to move the work table to a desired position by the operation of the high place moving means. There,
A jack that is provided on the front, rear, left, and right of the vehicle body, and performs a vertical extension operation or a left-right extension operation to support the vehicle body, or both;
A jack operating means for performing up-and-down extension operation or left-right extension operation of the jack, or both;
A jack operation actuator that performs up / down extension operation or left / right extension operation of the jack, or both in accordance with the operation of the jack operation means;
Jack extension amount detecting means for detecting the extension amount of the jack to the side of the vehicle body;
Based on information from the jack extension amount detection means, the protrusion prohibition area setting means for setting the vehicle body direction with the jack with a small extension amount as the protrusion prohibition area;
Altitude moving operation means for operating the altitude moving means;
An altitude moving actuator for operating the altitude moving means in response to an operation of the altitude moving operation means;
A high place movement restricting means for controlling the operation of the high place moving actuator such that the high place moving means or the work table moves into the overhang prohibited area set by the overhang prohibited area setting means; A safety device for an aerial work vehicle, comprising: A safety device for an aerial work vehicle configured to support a work table by a high place moving means disposed on a vehicle body and configured to move the work table to a desired position by the operation of the high place moving means. There,
A protrusion prohibition area setting means for setting a predetermined protrusion prohibition area on the left or right side of the vehicle body based on operating a protrusion prohibition switch for manually selecting a protrusion prohibition mode for the left or right of the vehicle body; ,
Altitude moving operation means for operating the altitude moving means;
An altitude moving actuator for operating the altitude moving means in response to an operation of the altitude moving operation means;
Upper operation means provided on the work table;
Lower operation means provided on the vehicle body,
A safety device for an aerial work vehicle, characterized in that control for restricting the operation of the high-altitude moving actuator by an operation from the upper operation means is performed unless the protrusion prohibition area is set by the protrusion prohibition area setting means. A work table position detecting means for detecting a height position of the work table;
When the platform height position detected by the platform position detection unit is above the installation surface of the platform work vehicle, the height movement restricting unit is configured to move the height into the set out prohibition region. The operation of the high place moving actuator that moves the place moving means or the work table is regulated, and the work table height position detected by the work position detecting means is below the installation surface of the work place vehicle. 3. The control according to claim 2, wherein in some cases, control is performed to permit the operation of the high place moving actuator such that the high place moving means or the work table moves into the set out protrusion prohibited region. Safety equipment for aerial work platforms.

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