JP2008110840A - Controller for high-lift work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain safety for temporary support work for supporting temporarily an electric wire using a temporary support device. <P>SOLUTION: A high-lift work vehicle has a boom arranged to be turned down and up or likely, a working block attached elevatably or likely between an upper moving position P(H) and a lower moving position P(L) in a tip of the boom, and the temporary support device O attached to the tip of the boom or the like to support the electric wire, and is set selectively with a usual mode for controlling a boom operation in response to a lever operation, and a temporary support mode allowing only an operation of the boom under fixed limitation with respect to the lever operation, under the condition where the electric wire is supported by the temporary support device. The high-lift work vehicle has an elevation position detector for detecting whether the working block is positioned in the lower moving position P(L) or not, and is set with the temporary support mode, only when detecting the presence of the working block positioned in the lower moving position P(L), by the elevation position detector. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control device for an aerial work vehicle including a temporary support device that is disposed at a tip of a boom provided on a travelable vehicle body and can support an electric wire.

  When power distribution work such as replacement of the insulators arranged on the power pole is performed, an aerial work vehicle having a temporary support device at the tip of a boom that is provided on the vehicle body and can freely move up and down is often used ( Patent Document 1). The temporary support device includes a sub boom that is attached to the tip of the boom, for example, a workbench so as to be at least movable up and down, a bracket that is attached to the tip of the sub boom so as to be able to swing in the vertical direction, There are some which have a temporary arm member extending in the direction and a supporting means for supporting the installed electric wire by arranging a plurality of temporary arm members in the horizontal direction.

In order to replace the insulator attached to the utility pole by this work at a high altitude, the temporary support device is moved near the insulator to be replaced by moving the boom up and down, etc., and the electric wire connected to the insulator is supported. After supporting the electric wire with a temporary support device instead of the utility pole, remove the electric wire from the insulator and replace it with a new insulator.
JP 2000-16800 A

  By the way, when the work table is moved to a predetermined work position, the work table may be moved up and down in the vertical direction depending on the contents of the work. In general, when the workbench is moved vertically, this is performed by vertical operation control that combines boom hoisting and telescopic movement, but the work table is not moved up and down by boom hoisting and telescopic movement. There is an aerial work vehicle in which an elevating mechanism is provided and the working platform can be moved up and down with respect to the boom without operating the boom by using the elevating mechanism. However, in such an aerial work vehicle, when the above-mentioned temporary support device is attached to the work table and the work is performed in a state where the electric wire is supported by the temporary support device, the work table is lifted by the lifting mechanism. Since there is a possibility that the worker may approach the electric wire, there is a need to avoid this for safety in working at high places.

  In view of the above problems, it is an object of the present invention to provide a control device for an aerial work vehicle in which safety is ensured when working at a high place while an electric wire is supported by a temporary support device. To do.

  In order to solve the above problems, a control device for an aerial work vehicle according to the present invention includes a vehicle body capable of traveling, a boom disposed on the vehicle body so as to be able to undulate, extend, retract, and turn, and a tip of the boom. Regardless of the boom undulation angle, it is always held in the horizontal direction so that it can freely vibrate and move up and down (for example, up and down movement between the upper movement position P (H) and the lower movement position P (L) in the embodiment). An attached workbench, a temporary support device that is attached to the tip of the boom and can support an electric wire, a boom operation device that is operated by an operator on the workbench to operate the boom, and the boom operation Boom operation control means (for example, the boom operation control circuit 31 in the embodiment) that controls the operation of the boom according to the operation of the device, and controls the boom up / down, expansion / contraction, and turning operation according to the operation of the boom operation device. To do Of an aerial work platform that can selectively set a mode and a temporary support mode that allows only the operation of the boom under certain restrictions with respect to the operation of the boom operation device while the electric wire is supported by the temporary support device. A control device for detecting whether or not the work table is moved downward with respect to the tip of the boom and is located within a predetermined lower movement position range (for example, a lift position detector in the embodiment) 21), and the temporary support mode can be selected and set only when it is detected by the workbench position detection means that the workbench is located within the predetermined downward movement position range.

  Another control apparatus for an aerial work vehicle according to the present invention includes a travelable vehicle body, a boom disposed on the vehicle body so as to be able to undulate, extend, retract, and pivot, and a boom undulation angle at a tip of the boom Regardless of the work table, the work table that is always held in the horizontal direction and is mounted so as to freely swing and move up and down, the temporary support device that is attached to the tip of the boom and can support the electric wire, and the work table for operating the boom And a boom operation control means for controlling the operation of the boom according to the operation of the boom operation device. The boom is raised and retracted according to the operation of the boom operation device. Selectively between a normal mode for controlling the turning operation and a temporary support mode for allowing only the operation of the boom under certain restrictions with respect to the operation of the boom operation device while the electric wire is supported by the temporary support device. This is a control device for a work platform capable of being fixed, and has a work table upper movement restricting means (for example, the lifting operation restriction circuit 34 in the embodiment) for restricting the upper movement of the work table, and is set to the temporary support mode. In this case, the upper movement of the work table is restricted by the work table upper movement restricting means.

  In the control apparatus for an aerial work vehicle having the above-described configuration, a work table position detecting means for detecting whether or not the work table is moved down with respect to the tip of the boom and located within a predetermined lower movement position range, and temporary support When the mode is set, it is preferable to have alarm means for performing an alarm operation when the work table position detecting means detects that the work table is not located within the predetermined lower movement position range.

  According to the control apparatus for an aerial work platform according to the present invention, it is detected by the work table position detection means that the work table is within a predetermined downward movement position range (within a predetermined range including the position of the lowermost end of the work table). It is possible to set to the temporary support mode in which the work at a high place is performed in a state where the electric wire is supported by the temporary support device attached to the tip side of the boom only in the state in which the boom is attached. Here, in the temporary support mode, the electric wire is temporarily supported by the temporary support device attached to the tip end side of the boom, and therefore, when this electric wire is a live wire (an electric wire in an energized state), It is desirable to increase safety by moving away from the electric wire by a predetermined distance or more. According to the present invention, the temporary support mode can be set only when the work table is within the predetermined downward movement position range (within the predetermined range including the position of the lowermost end of the work table). At this time, there is little possibility that an operator who has boarded the work table may approach or interfere with the temporarily supported electric wire, and it is possible to ensure the safety of work at a high place.

  According to another control apparatus for an aerial work vehicle according to the present invention, when the temporary support mode is set, the uplift of the work table is restricted, so that an operator on the work table temporarily supports it. Therefore, the movement of the work table that approaches the electric wire is restricted, and it is possible to ensure the safety of work at a high place.

  Furthermore, safety can be further improved by adopting a configuration in which an alarm operation is performed by an alarm means when the work table is not located within the predetermined downward movement position range.

  A preferred embodiment of a control apparatus for an aerial work vehicle according to the present invention will be described below with reference to FIGS. FIG. 1 shows an example of an aerial work vehicle equipped with the control device. The aerial work vehicle 1 can travel with front and rear wheels 3a and 3b on the front, rear, left and right sides of the vehicle body 2, and is constructed based on a truck vehicle having a driving cabin 2a at the front of the vehicle body 2. On the vehicle body 2 of the truck vehicle, a turntable 4 that is driven by a turn motor 51 and configured to be able to turn horizontally is disposed. The base 5 is pivotally connected to the swivel 4 and a boom 5 is attached. The boom 5 is moved up and down by a hoisting cylinder 52. The boom 5 is configured such that the base boom 5a, the intermediate boom 5b, and the distal boom 5c are combined in a nested manner, and the boom 5 as a whole can be expanded and contracted in the longitudinal axis direction by a built-in expansion cylinder 53.

  The tip boom 5c has a boom head 5d at the tip, and a vertical post member 6 is pivotally attached to the boom head 5d so as to be swingable up and down. The vertical post member 6 is controlled by swinging of the vertical post member 6 by a leveling cylinder (not shown) disposed between the tip of the front end boom 5c or the boom head 5d and the vertical post member 6, and the boom 5 is raised and lowered. In any case, the vertical post member 6 is controlled to swing so that the vertical post member 6 always extends vertically. The worktable bracket 25 is attached to the vertical post member 6 that is always held vertically as described above so that it can be swiveled horizontally (swingable) with respect to the vertical post 6 by the swing motor 54.

  As shown in FIG. 2, the work table 7 is attached to the work table bracket 25 with the work table bracket 25 so as to freely vibrate with the work table bracket 25. Regardless of the undulation of 5, it is always held horizontally. The work table 7 is moved up and down with respect to the work table bracket 25 by the work table lifting device 10. The work table elevating device 10 includes an elevating cylinder 56, and the work table 7 is configured to be moved up and down by the elevating cylinder 56. In other words, the work table 7 is moved upward and downward from the lower movement position P (L) located at the lowermost position as shown in FIG. The distance P to the moving position P (H) is moved up and down. As described above, the work table 7 can freely vibrate around the vertical post member 6 (horizontal turning operation) and can be moved up and down (or moved up and down) by the work table lifting device 10.

  A lifting device 60 (auxiliary work device) as an auxiliary work device is provided at the upper end of the vertical post member 6. The lifting device 60 is not necessarily limited to the one attached to the upper end portion of the vertical post member 6, and may be configured to be attached to the worktable bracket 25. That is, it should just be attached to the boom tip side.

  The work table 7 is provided with an upper operation device 11 that is operated by an operator on the work table 7. As shown in FIG. 4, the upper operating device 11 operates the boom 5 (raising and lowering and expanding / contracting movement), and the boom operating lever 12 for performing an operation for turning the swivel 4 and the work table 7 on the neck. It has a swing operation lever 13 for performing an operation for vibrating. The upper operation device 11 includes a winch operation lever 14 that performs an operation for driving a winch drive motor 55 (described later) of the lifting device 60 and an elevating operation lever 15 that performs an operation for moving the work table 7 up and down. And have. An operator who rides on the work table 7 operates the boom operation lever 12 of the upper operation device 11 to freely move the boom 5 up and down and expand and contract, to turn the swivel table 4 (boom 5), and to swing the head. By operating the lever 13, the work table 7 is vibrated in the neck, and further, the work table 7 is moved up and down by operating the elevating operation lever 15, thereby moving the work table 7 to a desired or arbitrary height position. Can be made.

  The vehicle body 2 is provided with jacks 8 that are widened outwardly in the left-right direction and retractable below the vehicle body 2 at four locations on the front, rear, left, and right sides of the vehicle body 2. The vehicle body 2 can be stably supported by projecting left and right and extending downward. The jack 8 can be operated as described above by operating a jack operating lever 18 of a lower operating device 17 disposed so as to protrude upward at a rear end portion of the vehicle body 2. The jack operating lever 18 is swingable in the longitudinal direction of the vehicle body 2. When the lever 15 is tilted forward from the neutral state, the jack 8 is retracted, and when the lever is tilted backward from the neutral state, the jack 8 is extended. The operation of the jack 8 stops when the lever that has been operated and returned to the neutral state is returned to the neutral state. At the center of the vehicle body 2, a boom receiver 9 that is in contact with the lower surface of the boom 5 that has fallen in a fully contracted state and stores and supports the boom 5 is disposed so as to protrude upward.

  Here, the auxiliary work device provided in the aerial work vehicle 1 will be described. First, as shown in FIG. 2, the case where the auxiliary work device is used as a lifting device 60 for performing the lifting work will be described. In the lifting device 60, the turning base 26 is attached to the upper end portion of the vertical post member 6 so as to be horizontally turnable with respect to the vertical post member 6, and the operator swings up and down around the pivot pin 61. A support bracket 62 that can be moved up and down is pivotally connected.

  The support bracket 62 has a plurality of pin holes 74 for attaching the support bracket 62 to the swivel base 26, and one of the plurality of pin holes 74 matches the pin hole 74 formed in the swivel base 26. By inserting the fixing pin 75 in this state, the operator can fix the support bracket 62 in a state where the support bracket 62 is raised and lowered with respect to the turning base 26 at a desired angle.

  A winch arm 63 is attached to the support bracket 62 so as to be slidable in the longitudinal direction, and the winch arm 63 can be moved up and down as the support bracket 62 moves up and down. The winch arm 63 is a fixed pin in a state in which any one of a plurality of pin holes 64 provided on the side surface of the winch arm 63 at intervals in the longitudinal direction is aligned with the pin hole 64 formed in the support bracket 62. By inserting 65, the winch arm 63 can be fixed to the support bracket 62 in a state where the winch arm 63 is slid in the longitudinal direction and adjusted to a desired slide position.

  A support frame 72 that rotatably holds the winch drum 68 is attached via a pivot pin 73 to a protrusion 62a that protrudes from the support bracket 62 toward the winch drum 68 described later. The support frame 72 is provided with a winch drum 68 configured to freely wind or unwind the rope 67. A winch drive motor 55 that is driven by hydraulic pressure from the hydraulic pump P is attached to the outer wall surface of the support frame 72. When the winch drive motor 55 is driven to rotate, a driving force is transmitted to the winch drum 68 in the support frame 72 via a reduction gear (not shown), the winch drum 68 is rotated, and the rope 67 is wound or fed out.

  A rope 67 that is wound or unwound by the winch drum 68 is looped over a sheave 66 that is rotatably attached to a sheave bracket 69 that is detachably attached to the tip of the winch arm 63. A hook 71 for hanging a lifting target is attached to the tip of the rope 67 suspended from the sheave 66.

  The auxiliary work device provided in the aerial work device can also be used as a temporary support device 80 for performing temporary support work during wiring work or the like. As shown in FIG. 3, the temporary support device 80 is assembled by the operator removing the sheave bracket 69 from the tip of the winch arm 63 and attaching the temporary support arm 81 instead. Alternatively, the entire winch arm having the sheave bracket may be replaced with a member having the illustrated temporary support arm and winch arm with respect to the support bracket 62. Then, when the rope 67 is wound up by driving the winch drum 68 in a state where the hook 71 is hooked on the wire attachment pin 76 (eye bolt) attached to the base end portion of the winch arm 63, the winch arm 63 is attached to the support bracket 62. On the other hand, it slides in the direction of the tip of the winch arm 63. In this state, the winch arm 63 is raised and the fixing pin 75 is inserted and held in the vertical state. The work table 7 is moved in the vertical direction by performing a control that combines the raising and lowering movements of the boom 5 and the expansion and contraction movements, thereby being held by the electric wire holder 82 attached to the temporary support arm 81 as shown in FIG. The electric wire D (shown in cross section in the figure) is pushed upward.

  As shown in FIG. 4, the upper operation device 11 has a work mode changeover switch 16 in addition to a boom operation lever 12, a swing operation lever 13, a winch operation lever 14, and a lift operation lever 15. In response to the operation of the boom operation lever 12, an operation signal for raising, lowering, turning and extending / contracting the boom 5 is output from the boom operation lever 12 to the controller 30 provided in the vehicle body 2. Further, an operation signal for causing the work table 7 to vibrate is output from the swing operation lever 13 to the controller 30 in response to the operation of the swing operation lever 13. Further, in response to the operation of the winch operation lever 14, an operation signal for rotating the winch drive motor 55 is output from the winch operation lever 14 to the controller 30, and in response to the operation of the elevating operation lever 15. An operation signal for moving the work table 7 up and down is output to the controller 30. As will be described later, a manual valve configuration may be employed in which the corresponding control valves are directly operated and controlled based on the operations of the boom operation lever 12, the swing operation lever 13, the winch operation lever 14, and the elevation operation lever 15. In the case of this configuration, an electromagnetic unloading valve that shuts off this pipe line is provided in a pipe line that connects the hydraulic limit and the work table lifting control valve to restrict the ascent movement of the work board, which will be described later. The lift of the work table is restricted by switching the valve with a control signal.

  The work mode changeover switch 16 uses a normal mode (work mode in which the operation of the boom 5 corresponding to the operation of the boom operation lever 12 is performed as it is) and a temporary support device 80 for performing a normal work at a high place. The switch is for performing a switching operation of the work mode including the temporary support mode for performing the temporary support work, and outputs a switching signal to the controller 30 according to the operation. Here, the temporary support mode includes an electric wire movement mode and an electric wire push-up mode. By switching the work mode changeover switch 16, a normal mode, an electric wire move mode, an electric wire push-up mode, a normal mode, an electric wire move mode, an electric wire push-up mode. The working mode is switched repeatedly in the order of mode.

  In the temporary support mode, control for narrowing the moving range of the work table 7 accompanying the boom operation as compared with the normal mode is also performed. Alternatively, in the normal mode, moment restriction control is performed to restrict the operation of the boom 5 so as to limit the moment value acting on the vehicle body within a predetermined range. In the temporary support mode, the movable range of the work table 7 or the tip of the boom 5 is set. It is good also as control which is comprised so that the work range restriction control to restrict | limit may be performed, and restrict | limits the movable range in work range restriction control. As described above, in the temporary support mode, only the operation of the boom 5 under a certain restriction is allowed for the operation of the boom operation lever 12.

  The control device 100 according to the present invention is configured to include an elevating position detector 21, an undulation angle detector 22, a controller 30, and a hydraulic unit 40 in addition to the upper operating device 11 as described above. The raising / lowering position detector 21 is composed of, for example, a limit switch, and outputs a detection signal as an ON signal to the controller 30 when the work table 7 is located at the lower movement position P (L), and the work table 7 moves downward. When it is located at a position other than position P (L), it outputs a detection signal as an off signal to controller 30. Here, the downward movement position P (L) is not limited to the case where the work table 7 as shown in FIG. 2 is located at the lowermost position, but a predetermined lower movement position range (work platform) including the lowermost position. The detection signal as the ON signal is output from the lift position detector 21 toward the controller 30 within a range in which the possibility that the operator who has boarded the motor 7 interferes with the electric wire supported by the temporary support device 80 can be excluded. It may be set.

  The undulation angle detector 22 detects the undulation angle of the winch arm 63 (for example, the angle formed by the longitudinal axis of the winch arm 63 and the horizontal plane) and outputs a detection signal to the controller 30. As a specific method of detecting the undulation angle, for example, there is a method of detecting the undulation angle of the support bracket 62 with respect to the turning base 26 with a potentiometer or the like.

  When the operation lever of the upper operation device 11 or the lower operation device 17 is operated, the controller 30 receives operation signals output from these operation devices 11 and 17 and outputs a control signal to the hydraulic unit 40 to turn the turntable 4. , Controls the operation of the boom 5, the workbench 7, the lifting device 60 and the jack 8. The hydraulic unit 40 includes various control valves, and controls supply / discharge of hydraulic oil to / from the swing motor 51 and the like based on a control signal from the controller 30. These control valves are configured as manual valves, and the corresponding control valves are directly operated and controlled based on operations of the boom operation lever 12, the swing operation lever 13, the winch operation lever 14, the elevating operation lever 15, and the like. May be.

  Then, the swing motor 51 that swings the swivel 4 configured as described above, the hoisting cylinder 52 that moves the boom 5 up and down, the telescopic cylinder 53 that expands and contracts the boom 5, and the work table 7 vibrate (swivel). The operation of the swing motor 54 for driving, the winch drive motor 55 for driving the lifting device 60, the lifting cylinder 56 for moving the work table 7 up and down, and the jack actuator 57 for expanding and contracting the jack 8 are arranged in the vehicle body 2 and work at a high place. This is done by controlling the supply and discharge of hydraulic oil discharged from a hydraulic pump P that can be driven by transmitting the driving force of an engine (not shown) for running the vehicle 1.

  In addition to the oil tank T and the hydraulic pump P, the hydraulic unit 40 controls the swing motor 51, the hoisting cylinder 52, the telescopic cylinder 53, the swing motor 54, the winch drive motor 55, the lifting cylinder 56, and the jack actuator 57. A valve 41, an undulation control valve 42, an expansion / contraction control valve 43, a swing control valve 44, a winch control valve 45, a lift control valve 46, and a jack actuator control valve 47 are configured. Then, the supply / discharge control of the hydraulic fluid flowing to the swing motor 51 and the like is performed according to a control signal from the controller 30, the swing control valve 41, the undulation control valve 42, the expansion / contraction control valve 43, and the swing control valve in the hydraulic unit 40. 44, the opening degree of the winch control valve 45, the elevation control valve 46 and the jack actuator control valve 47 is controlled.

  The controller 30 includes a boom operation control circuit 31, a worktable operation control circuit 32, a temporary support mode detection circuit 33, and an elevation operation restriction circuit 34. The boom operation control circuit 31 outputs a control signal to the hydraulic unit 40 to control the opening degrees of the swing control valve 41, the undulation control valve 42 and the expansion / contraction control valve 43 in the hydraulic unit 40, and the boom 5 swings. Controls undulation and expansion and contraction.

  When the boom operation lever 12 is operated in a state where the work mode switch 16 is switched to the normal mode, the boom operation control circuit 31 operates the swing motor 51, the hoisting cylinder 52, and the telescopic cylinder 53 in response to the operation. Thus, the boom 5 can be raised and lowered. When the work mode changeover switch 16 is switched to the electric wire movement mode of the temporary support mode, when the boom operation lever 12 is operated, the swing motor 51, the hoisting cylinder 52 and the telescopic cylinder 53 are operated in combination. In response to the operation of the boom operation lever 12, the tip (work table 7) of the boom 5 can be operated in the horizontal direction or the vertical direction (vertical direction) (horizontal / vertical movement control). Further, in the state where the work mode changeover switch 16 is switched to the electric wire push-up mode of the temporary support mode, when the boom operation lever 12 is operated, the hoisting cylinder 52 and the telescopic cylinder 53 are operated in combination to operate the boom 5. The tip (work table 7) can be operated in the vertical direction (vertical direction) (vertical movement control).

  The worktable operation control circuit 32 outputs a control signal to the hydraulic unit 40 in response to the operation of the swing operation lever 13 and the lift operation lever 15, and the swing control valve 44 and the lift control valve 46 in the hydraulic unit 40 are output. The opening degree of the valve is controlled to control the neck vibration and the up-and-down movement of the work table 7.

  In the temporary support mode detection circuit 33, the work mode changeover switch 16 is switched to the temporary support mode (wire movement mode or wire push-up mode), and a switch signal indicating the temporary support mode is sent from the work mode changeover switch 16 to the controller 30 side. Detect input. The temporary support mode detection circuit 33 selects the temporary support mode by the work mode changeover switch 16 or when the temporary support device 80 is detected by the undulation angle detector 22 described above, Judged to be in support mode.

  The lift operation regulating circuit 34 is connected to the hydraulic unit from the work bench operation control circuit 32 when an off signal is output from the lift position detector 21, that is, when the work table 7 is located at a position other than the lower movement position P (L). By regulating the output of the control signal to 40, it is possible to regulate the up-and-down movement of the work table 7. When the buzzer 90 detects that the work mode changeover switch 16 has been switched to the temporary support mode side by the temporary support mode detection circuit 33, the buzzer 90 outputs an off signal from the lift position detector 21. That is, when the work table 7 is located at a position other than the downward movement position P (L), a warning sound is generated to indicate that the normal mode is maintained without shifting to the temporary support mode (or the warning lamp is turned on).

  Note that the downward movement position P (L) is not limited to the case where the work table 7 is positioned at the lowermost position, and as described above, the ON signal output from the lift position detector 21 to the controller 30. Is set so that the detection signal is output within a predetermined range including the position of the lowermost end (a range in which an operator on board 7 can avoid interference with the electric wire supported by temporary support device 80). Thus, when the work table 7 moves up beyond a predetermined range including the lowest position, the work mode is set to the temporary support mode even if the work mode changeover switch 16 is switched to the temporary support mode side. It is possible to prevent migration. In this case, when the workbench 7 is raised beyond a predetermined range including the position of the lowermost end, a warning sound is generated that the buzzer 90 does not shift to the temporary support mode but remains in the normal mode. .

  The configuration of the control device 100 according to the present invention has been described above. Hereinafter, the operation of the control device 100 when the temporary support device 80 is used to replace the insulator provided on the utility pole will be described.

  First, after moving the aerial work vehicle 1 with the boom 5 stored on the vehicle body 2 to the work site where the lever is to be replaced, the jack 8 is extended to stably support the vehicle body 2 as shown in FIG. Then, an operator (not shown) gets on the work table 7, and this operator operates the upper operation device 11 to raise and lower the boom 5 to lift the boom 5 from the boom receiver 9, and then the swivel 4 And the boom 5 is expanded and retracted to move the work table 7 close to the electric wire D. At this time, the work mode is a normal mode, and the hoisting cylinder 52 and the like are operated, and the boom 5 performs a predetermined operation.

  If the tip of the boom 5 moves to the vicinity of the work position, the operator inserts the winch arm 63 to which the temporary support arm 81 is attached into the support bracket 62 and raises the end of the wire 67. It connects with the wire attachment pin 76 and makes the temporary support apparatus 80 a vertical state. Then, the operator operates the work mode changeover switch 16 to switch the work mode to the temporary support mode side. At this time, the temporary support mode detection circuit 33 shown in FIG. 4 detects that the work mode switch 16 has been switched to the temporary support mode.

  At this time, the lift position of the work table 7 is input from the lift position detector 21 to the controller 30 as a detection signal. This detection signal is output as an ON signal when the work table 7 is positioned at the downward movement position P (L) as described above. When the workbench 7 is not located at the downward movement position P (L), the lift position detector 21 outputs an off signal. As described above, the lower movement position P (L) of the work table 7 is the predetermined lower movement position range in which the work table 7 includes the lowermost position thereof (the operator who has boarded the work table 7 temporarily supports the temporary support device 80. It may be set at a position within a range where interference with the electric wire supported by the wire is avoided.

  When a detection signal as an ON signal is output from the lift position detector 21 in a state in which it is detected by the temporary support mode detection circuit 33 that the work mode changeover switch 16 is switched to the temporary support mode side. That is, in other words, when the work table 7 is positioned at the downward movement position P (L), the boom operation control circuit 31 controls the combination of raising / lowering movement, expansion / contraction movement, and turning movement of the boom 5 (horizontal / vertical). It is possible to shift to the temporary support mode in which the work table 7 is moved in the horizontal direction or the vertical direction by performing the operation control.

  On the other hand, when the temporary support mode detection circuit 33 detects that the work mode changeover switch 16 has been switched to the temporary support mode side and an off signal is output from the lift position detector 21. That is, when the work table 7 is located at a position other than the downward movement position P (L), the normal mode is maintained without shifting to the temporary support mode. At this time, when the buzzer 90 emits a warning sound, it is possible to notify an operator who has boarded the work table 7 that the work mode cannot be shifted to the temporary support mode.

  When the work mode shifts to the temporary support mode, the boom operation lever 12 is operated to move the boom 5 tip controlled in the horizontal / vertical operation by the boom operation control circuit 31 in the vertical direction, toward the target electric wire D. The electric wire holder 82 is moved. If the electric wire holder 82 moves to the vicinity of the electric wire D, the electric wire D is gripped in the electric wire holder 82 (as shown in FIG. 5), and the electric wire is taken from an insulator (not shown) provided on a power pole (not shown). After removing D, replace the insulator.

  When the work mode shifts to the temporary support mode, a restriction signal is output from the lift operation restriction circuit 34 to the work bench operation control circuit 32 even if the lift operation lever 15 for moving the work table 7 up and down is operated. As a result, the output of the control signal from the work table operation control circuit 32 to the lift control valve 46 of the hydraulic unit 40 is restricted, and the upward movement from the downward movement position P (L) of the work table 7 is restricted. As a result, when working at a high place with the electric wire supported by the temporary support device 80, the work table 7 does not move up and the operator who has boarded the work table 7 does not approach the electric wire. It is possible to work at high places.

  As described above, when the workbench 7 is located at a position other than the downward movement position P (L), the work mode cannot be shifted to the temporary support mode and remains in the normal mode. Since this is not done, there is a possibility that an operator who has boarded the work table 7 may approach the electric wire. In order to prevent this, the buzzer 90 emits a warning sound as described above to alert the operator that the work mode has not been shifted to the temporary support mode.

  In this embodiment, the controller 30 detects that the temporary support mode detection circuit 33 detects the switching signal output from the work mode switch 16 so that the operator attempts to switch the work mode to the temporary support mode. Although the configuration is such that the determination is made, the switching to the temporary support mode may be determined as follows.

  Judgment of switching to the temporary support mode by detecting a load applied to the winch arm 63 when the electric wire D held by the electric wire holder 82 is pushed upward by a load detector provided in the temporary support device 80. Or switching to the temporary support mode may be determined by attaching the hook 71 to the wire attachment pin 76. Alternatively, the determination may be made by attaching the temporary support arm 81 to the tip of the winch arm 63 or by detecting the undulation angle of the winch arm 63 by the undulation angle detector 22. When the temporary support operation is performed, the electric wire is supported in a state where the winch arm 63 extends in the vertical direction. Therefore, when the undulation angle detected by the undulation angle detector 22 is around 90, switching to the temporary support mode is performed. Judgment is made.

  Furthermore, in the above embodiment, when the operation mode changeover switch 16 is switched, an ON signal is input from the lift position detector 21 (a state where the workbench 7 is located at the lower movement position P (L)). However, the load applied to the temporary support device 80 when the electric wire D is pushed upward is detected regardless of the lift position of the work table 7. Alternatively, it may be configured to automatically shift to the temporary support mode. In this case, the lift position of the work table 7 is detected by the lift position detector 21, and the buzzer 90 emits a warning sound when the work table 7 is not positioned at the lower movement position P (L). Thus, attention can be paid to the approach of the work table 7 to the electric wire.

  In the embodiment described above, the work table 7 is vertically moved (moved up and down) in the vertical direction by the work table lifting device 10, but the structure for moving the work table 7 up and down is the work table shown in FIG. A vertical movement mechanism 130 may be used. This work table vertical movement mechanism 130 includes a first bracket 131 that is mounted on the vertical post member 6 so as to be horizontally rotatable, and an upper and lower link member 132 that is pivotally connected to the first bracket 131 and extends in parallel at an interval in the vertical direction. 133, a swinging cylinder 134 that swings the lower link member 133 up and down, a second bracket 134 attached to the distal ends of the upper and lower link members 132 and 133, and a vertically extending upper part of the second bracket 134. The work table 7 is attached to the second vertical post member 136 so as to be horizontally rotatable.

  The first and second brackets 131 and 135 and the upper and lower link members 132 and 133 form a parallel link. When the lower link member 133 is swung up and down by the swing cylinder 134, the second bracket 134 swings up and down. The work table 7 is moved up and down. At this time, since the parallel link mechanism is configured, the second vertical post member 136 is held in a vertically oriented state, and the work table 7 is held horizontally. The lifting device 60 and the temporary support device 80, that is, the auxiliary work device, is attached to the upper end of the vertical post member 6 that is attached to the boom head 5d of the tip boom 5c and held vertically.

It is a perspective view of an aerial work vehicle equipped with a control device according to the present invention. It is a front view which shows the lifting apparatus provided in the aerial work vehicle. It is a front view which shows the case where the said lifting apparatus is used as a temporary support apparatus. It is a block diagram which shows the structure of the said control apparatus. It is a perspective view of the aerial work vehicle which shows a mode that the electric wire was temporarily supported by the temporary support apparatus. It is a front view which shows the structure of the boom tip periphery about different embodiment of the aerial work vehicle of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Height work vehicle 2 Car body 4 Swivel base 5 Boom 5a Base end boom 5b Middle boom 5c End boom 7 Work base 8 Jack 11 Upper operation device 12 Boom operation lever 13 Swing operation lever 14 Winch operation lever 15 Lifting operation lever 16 Work Mode selector switch 17 Lower operating device 18 Jack operating lever 21 Elevating position detector (workbench position detecting means)
22 Ranging angle detector 30 Controller 31 Boom operation control circuit (boom operation control means)
32 Working table operation control circuit 33 Temporary support mode detection circuit 34 Elevating operation regulating circuit (work table raising / lowering regulating means)
51 Rotating Motor 52 Hoisting Cylinder 53 Telescopic Cylinder 54 Swing Motor 55 Winch Drive Motor 56 Lifting Cylinder 57 Jack Actuator 60 Lifting Device 62 Support Bracket 63 Winch Arm 66 Sheave 67 Wire 68 Winch Drum 72 Support Frame 76 Wire Mounting Pin 80 Temporary Support Device 81 Temporary support arm 90 Buzzer 100 Control device

Claims (3)

A vehicle body capable of traveling, a boom disposed on the vehicle body so as to be able to undulate, extend, retract, and turn freely. A worktable that is freely attached, a temporary support device that is attached to the tip side of the boom and can support an electric wire, and a boom operation device that is operated by an operator who has boarded the worktable to operate the boom And a boom operation control means for controlling the operation of the boom according to the operation of the boom operation device,
A normal mode in which the boom is controlled to move up and down, extend and contract in response to the operation of the boom operation device, and the electric wire is supported by the temporary support device, with certain restrictions on the operation of the boom operation device. A control device for an aerial work vehicle capable of selectively setting a temporary support mode that allows only the operation of the boom,
A work table position detecting means for detecting whether or not the work table is moved downward with respect to a tip of the boom and located within a predetermined lower movement position range;
The temporary support mode can be selected and set only when the work table position detecting means detects that the work table is located within the predetermined downward movement position range. Control equipment for work stations. A vehicle body capable of traveling, a boom disposed on the vehicle body so as to be able to undulate, extend, retract, and turn freely. A worktable that is freely attached, a temporary support device that is attached to the tip side of the boom and can support an electric wire, and a boom operation device that is operated by an operator who has boarded the worktable to operate the boom And a boom operation control means for controlling the operation of the boom according to the operation of the boom operation device,
A normal mode in which the boom is controlled to move up and down, extend and contract in response to the operation of the boom operation device, and the electric wire is supported by the temporary support device, with certain restrictions on the operation of the boom operation device. A control device for an aerial work vehicle capable of selectively setting a temporary support mode that allows only the operation of the boom,
A work table top movement regulating means for regulating the work table top movement;
The control apparatus for an aerial work vehicle, wherein when the temporary support mode is set, the upper movement of the work table is restricted by the work table upper movement restricting means. A work table position detecting means for detecting whether or not the work table is moved downward with respect to the tip of the boom and located within a predetermined lower movement position range;
Alarm means for performing an alarm operation when the work table position detection means detects that the work table is not located within the predetermined lower movement position range when the temporary support mode is set. The control device for an aerial work vehicle according to claim 2.

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