JP2006151628A - Control equipment for aerial work platforms - Google Patents

Abstract

In an aerial work vehicle having a boom and a jack, the safety of the aerial work is improved.
An aerial work vehicle (1) includes a boom (5) attached on a vehicle body (2), a work platform (7) attached to the tip of the boom (5), and a jack (8) attached to the vehicle body (2) to lift and support the vehicle body (2). An interlock control circuit that allows the jack 8 to extend and retract when the boom 5 is stored on the vehicle body 2, and controls the operation of the jack 8 when the boom 5 is not stored on the vehicle body 2. A jack operation lever 12a that performs an operation of extending and retracting 8; a boom storage detector that detects that the boom 5 is stored on the vehicle body 2; and an upper power switch 11c provided on the work table 7. When the upper power switch 11c is turned on, the expansion and contraction of the jack 8 is restricted regardless of the operation of the jack operating lever 12a even when the retracting of the boom 5 is detected. That.
[Selection] Figure 1

Description

  The present invention relates to a control device for an aerial work vehicle, and more specifically, a lifting device such as a boom mounted on a vehicle body of an aerial work vehicle so as to freely move up and down, and a vehicle mounted on the front, rear, left and right of the vehicle body. The present invention relates to a control device for an aerial work vehicle having a jack.

  In general, an aerial work vehicle such as that described above is provided with a swivel base that can swivel relative to the vehicle body on a travelable vehicle body, and the swivel base can freely move up and down with respect to the vehicle body by the expansion and contraction of the hoisting cylinder. The boom is pivotally connected to each other, and the entire boom is expanded and contracted by the expansion and contraction of the telescopic cylinder inside the boom in which a plurality of boom members are nested. In addition, a work table is freely attached to the tip of the boom so that it can freely swivel (neck vibration), and an operator who gets on the work table moves the boom up and down, swivels, and expands and contracts, and swivels the work table. The workbench can be moved to a desired or arbitrary height position. In addition, the vehicle body is provided with boom receivers that support the boom by contacting the lower surface of the boom that has fallen down in a fully contracted state. A jack which can be expanded and contracted is provided below the vehicle body and the vehicle body, and the jack can lift and support the vehicle body when working at a high place.

In order to ensure the safety of work at high altitudes, the above-mentioned high-altitude work vehicles prevent the operation of the boom when the boom is not retracted into the vehicle body or the boom during the operation of the jack. For example, an interlock control device that restricts the simultaneous operation of the boom and the jack as described in Patent Document 1 and Patent Document 2 is provided. In order to perform interlock control that allows the operation of the jack by detecting the state in which the boom is fully collapsed and stored in the vehicle body, the state in which the boom is stored on the vehicle body is displayed on the vehicle body. A boom retract detector for detection is attached.
JP 2003-128393 A JP 2002-348099 A

  By the way, in an aerial work vehicle in which the interlock control as described above is performed, the boom is stored in a state where the boom is stored on the vehicle body even when an operator or the like is on the work table. Since the operation of the jack is allowed based on the detection of the storage of the boom on the vehicle body by the storage detector, the expansion and contraction movement of the jack is possible. However, since the extension amount of all the jacks is not always the same when the jack is operated, the vehicle body is inclined (that is, the work table is inclined), and the worker on the work table is unstable. There was a problem in the safety of work because I had to take a proper posture.

  In addition, although the operation of the jack is restricted by the interlock control as described above, in the case where it is necessary to adjust the extension amount of the jack, by operating the interlock release switch disposed on the vehicle body, It was possible to release the interlock control that restricts the operation of the jack. For this reason, when such interlock control is released during high-altitude work, an ungrounded jack may be generated if the jack is accidentally operated and the jack is activated. Depending on the direction, there is a risk that the moment of trying to overturn the vehicle body increases and the vehicle body becomes unstable.

  In view of the above problems, in the present invention, in an aerial work vehicle in which an elevating device such as a boom is provided on a vehicle body and a jack is operated to operate the aerial vehicle, the safety of the aerial work is improved. An object is to provide a control device for an aerial work vehicle.

  In order to solve the above-described problems, a control device for an aerial work vehicle according to the present invention is attached to a lifting device (for example, the boom 5 in the embodiment) mounted on a travelable vehicle body and to the tip of the lifting device. The work table, the jack that is attached to the vehicle body and supports the vehicle body, the jack operation is allowed when the lifting device is stored on the vehicle body, and the jack operation when the lifting device is not stored on the vehicle body In an aerial work vehicle having an interlock device (for example, the interlock control circuit 35 and the interlock solenoid valve 71 in the embodiment) that regulates the jack, jack operation means (for example, a jack in the embodiment) that operates the jack Operation lever 12a) and worker boarding determination means (for example, a worker boarding determination means for determining whether or not an operator or the like is on the work table) , An operator boarding determination circuit 34) in the embodiment, and a storage detection means (for example, a boom storage detector 21 in the embodiment) for detecting that the lifting device is stored on the vehicle body. When it is determined by the means that an operator or the like is on the work table, the operation of the jack is regulated regardless of the operation of the jack operation means even when the storage of the boom is detected by the storage detection means. To do.

  In addition, the control device for an aerial work vehicle having the above-described configuration includes restriction release means (for example, the restriction release switch 12b in the embodiment) for performing an operation of releasing the restriction of the operation of the jack by the interlock device, When it is determined by the determination means that an operator or the like is on the work table, the operation of the jack by the operation of the restriction release means is restricted only when the storage detecting means detects the storage of the lifting device. It is preferable to allow the release of.

  Furthermore, in the control device for an aerial work vehicle having the above-described configuration, an operation control means (for example, the controller 30 in the embodiment) provided on the work table and used to control the operation of the lifting device, and an operation provided on the work table. It has a work table power operation means (for example, the upper power operation switch 11c in the embodiment) for performing an on / off operation for supplying power to the control means, and the operator boarding determination means is turned on by the work table power operation means. It is preferable that the configuration is such that it is determined that an operator or the like is on the workbench when the operation is performed.

  On the other hand, in the control device for an aerial work vehicle having the above-described configuration, a first locking tool (for example, the hook 83 in the embodiment) attached to an operator who has boarded the work table, and a second device attached to the work table. And a locking detection means (for example, implementation) for detecting whether or not the first locking tool is locked to the second locking tool. And when the operator boarding determination means detects the locking of the first locking tool to the second locking tool by the locking detection means. You may comprise so that it may determine with the operator etc. boarding the worktable.

  Further, the control apparatus for an aerial work vehicle having the above-described configuration includes work table load detection means (for example, work table load detector 23 in the embodiment) for detecting the load on the work table, and the worker boarding determination means includes In addition, it may be determined that an operator or the like is on the work table when a load greater than or equal to a predetermined value is detected by the work table load detecting means.

  According to the control device for an aerial work vehicle according to the present invention, when an operator or the like is on the work table at the tip of the boom (elevating device), the boom is stored on the vehicle body. However, since the operation of the jack is regulated regardless of the operation of the jack operation means, when the operator or the like is on the work table, the inclination of the vehicle body due to the operation of the jack does not occur. The safety of workers is ensured. In addition, when an operator or the like is on the work table, the jack operation control by the interlock control can be released only when the boom is stored on the vehicle body. Even if the operation for releasing the interlock control is performed, the restriction on the operation of the jack is not released, and the jack does not operate, so that it is not ungrounded, and the safety of the worker is ensured.

  Further, whether or not an operator or the like is on the workbench performed for interlock control as described above is determined by, for example, detecting the operation state of the workbench power supply operating means provided on the workbench. Or using a locking detection means for detecting whether or not the first locking tool attached to the operator is locked by the second locking tool connected to the work table, or loading the work table This is possible by using a work table load detecting means for detecting the load. As described above, it is possible to configure a control device for safety of the worker at a low cost by determining the boarding of the worker by using what has been conventionally provided on the work table.

  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.

  Here, the first embodiment of the operation restriction of the jack 8 and the release of the action restriction using the control device for an aerial work vehicle according to the present invention will be described first. The aerial work vehicle 1 is capable of traveling 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, there is disposed a turntable 4 that is driven by a turn motor 51 and configured to be able to turn horizontally. 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 tip 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 pivotably attached to the boom head 5d so as to swing 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 work table 7 is attached to the vertical post member 6 that is always held vertically in this manner so that it can be swiveled horizontally (swinged freely) by the swing motor 55. Holds horizontally.

  Further, the upper operating device for operating the boom 5 on the work table 7 (raising and lowering and expanding and contracting) and for rotating the swivel table 4 and for rotating the work table 7 (neck vibration). 11 is arranged, and an operator who rides on the work table 7 operates the operation lever of the upper operation device 11 to freely move the boom 5 up and down and expand and contract, thereby turning the swivel table 4 (boom 5). Further, the work table 7 is pivoted to move the work table 7 to a desired or arbitrary high position.

  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 lifted and supported by widening left and right and projecting and extending downward. The jack 8 can be operated as described above by operating a jack operating lever of the lower operating device 12 disposed at the rear end of the vehicle body 2. In addition, a boom receiver 9 is disposed in the center portion of the vehicle body 2 so as to protrude upward while coming into contact with the lower surface of the boom 5 that has fallen in the fully contracted state.

  As shown in FIG. 2, the control device 60 according to the present invention operates when the operation levers of the upper operation device 11 and the lower operation device 12 are operated in addition to the upper operation device 11 and the lower operation device 12 described above. In response to an operation signal output from the operation devices 11 and 12, a control signal is output to the hydraulic unit 40 and the like, and the controller 30 that controls the operation of the boom 5, the workbench 7, and the jack 8, And a hydraulic unit 40 that controls the supply and discharge of hydraulic oil to and from the undulating cylinder 52 and the like.

  The boom operation lever 11a in the upper operation device 11 protrudes above the work table 7 and can be swung and rotated in the horizontal direction, and an operator who is on the work table 7 operates this operation lever. Operation signals for performing expansion / contraction, turning, and undulation movement of the boom 5 are output to the lower controller 30b of the controller 30 provided on the vehicle body 2 via the upper controller 30a of the controller 30 provided on the work table 7. It is possible to make it. Further, the swing operation lever 11b in the upper operation device 11 is rotatable in the horizontal direction. By operating this operation lever, an operation signal for causing neck vibration (swivel movement) of the work table 7 is transmitted to the upper controller. 30a can be output.

  Further, the upper power switch 11c in the upper operation device 11 is configured so as to be able to be turned on / off, and when an operator on the work table 7 turns on the switch, an operation signal is output to the upper controller 30a. Then, power from a power source (not shown) mounted on the work table 7 is supplied to the upper controller 30a, and operation signals from the boom operation lever 11a and the swing operation lever 11b in the upper operation device 11 can be input. Therefore, by turning on the upper power switch 11c, the boom 5 is expanded and contracted according to the operation of the boom operation lever 11a, and the work table 7 is moved to a desired position according to the rotation operation of the swing operation lever 11b. Can be swung (neck vibration).

  On the other hand, the jack operating lever 12a in the lower operating device 12 protrudes upward at the rear end of the vehicle body 2 and can swing in the front-rear direction of the vehicle body 2. When the lever is tilted forward from the neutral state, the jack 8 is retracted. An operation signal to be operated is output to the lower controller 30b, and when this lever is tilted backward from the neutral state, an operation signal for extending the jack 8 is output to the lower controller 30b, and further, the lever that is tilted up or down is neutral. When returning to the state, the output of the operation signal to the lower controller 30b is stopped.

  Further, the restriction release switch 12b in the lower operation device 12 is configured to be able to be turned on and off, and an operation signal for releasing the operation restriction of the jack 8 by the interlock control circuit 35 described later by turning on the switch 12b is sent to the lower controller 30b. It is possible to output.

  The control device 60 includes a boom retract detector 21, a hook locking detector 22, and a work table load detector 23 in addition to the upper operating device 11 and the lower operating device 12 described above.

  The boom storage detector 21 is formed of, for example, a limit switch provided on the boom receiver 9 and capable of outputting an on / off signal. When the boom 5 is placed on the boom receiver 9, the boom storage detector 21 is pressed against the lower surface of the boom 5. As a result, the limit switch is activated to output a detection signal as an ON signal to the lower controller 30b.

  Similarly, the hook locking detector 22 also comprises a limit switch that can output an on / off signal. When the hook 83 of the safety wearing band 80 described later in detail is locked to the hook locking bracket 84, By operating the limit switch and outputting an ON signal toward the lower controller 30b, the locked state of the hook 83 can be detected.

  The work table load detector 23 is attached to the periphery of the vertical post 6 and can detect the load on the work table 7 as described in a third embodiment to be described later.

  In addition, the upper controller 30a of the controller 30 has a work table operation control circuit 33 that controls the operation of the work table 7 based on an input of an operation signal by operating the boom operation lever 11a, and the lower controller 30b includes a boom operation control circuit 33b. A boom operation control circuit 31 that controls the operation of the boom 5 based on an operation signal input by operating the lever 11a, and a jack operation control that controls the operation of the jack 8 based on an operation signal input by operating the jack operation lever 12a. An input of an operation signal by turning on the circuit 32 and the upper operation switch 11c, a detection signal from the boom storage detector 21, or a load exceeding a predetermined level is applied to the work table 7 by the work table load detector 23. When the detection signal indicating is input, an operator or the like (that is, not only the operator but also a predetermined Tools and the like of the weight of the top and a worker boarding determination circuit 34 determines that include cases that are stacked on the workbench 7) is on board.

  Further, the lower controller 30b controls the operation of the jack 8 so that the boom 5 and the jack 8 do not operate simultaneously even when an operation signal is input by operating the jack operating lever 12a during the operation of the boom 5. An interlock control circuit 35 that outputs a restriction signal for restricting the output of the signal from the jack operation control circuit 32 to the jack operation control circuit 32 is provided.

  Then, a swing motor 51 that swings the swivel 4 configured as described above, a hoisting cylinder 52 that moves the boom 5 up and down, and an extendable cylinder 53 that moves the boom 5 in a telescopic manner (hereinafter referred to as the swing motor 51, the hoisting cylinder 52, and The expansion cylinder 53 is collectively referred to as a “boom actuator 54”, the swing motor 55 that causes the work table 7 to vibrate (swivel), and the jack actuator 56 that causes the jack 8 to expand and contract. This is performed by controlling the supply and discharge of the hydraulic oil discharged from the hydraulic pump P that can be driven by transmitting the driving force of the engine (not shown). This supply / discharge control is provided in the hydraulic unit 40 and corresponds to each cylinder and the like, a swing control valve 41, a undulation control valve 42, an expansion / contraction control valve 43 (hereinafter, the swing control valve 41, the undulation control valve 42 and the expansion / contraction control). The valve 43 is collectively referred to as a “boom actuator control valve 44”), the swing control valve 45 and the jack actuator control valve 46 are controlled by controlling the valve openings.

  Next, the hydraulic circuit 70 that drives the boom 5 and the jack 8 will be described. As shown in FIG. 3, the hydraulic circuit 70 includes an interlock solenoid valve 71, a boom actuator control valve 44, a jack actuator control valve 46, in addition to a pump P driven by a pump drive engine E disposed in the vehicle body 2. And a boom actuator 54 and a jack actuator 56.

  The oil passage 72 extending from the pump P extends to the interlock solenoid valve 71 and then branches to the boom oil passage 73 and the jack oil passage 74. The boom oil passage 73 is connected to the boom actuator control valve 44 and further to the boom actuator 54. The jack oil passage 74 extends to the jack actuator control valve 46 and further to the jack actuator 56.

  The operation control of the boom actuator 54 and the jack actuator 56 is performed by controlling the supply and discharge of the hydraulic oil discharged from the pump P. This supply / discharge control is performed by the boom actuator control valve 44 and the jack actuator control valve 46, and the hydraulic oil is supplied to both the control valves 44 and 46 through the interlock solenoid valve 71.

  The interlock solenoid valve 71 is a neutral return type valve that is in a neutral state (the state shown in FIG. 3) in a non-excited state. When the boom solenoid 71b is energized and the interlock solenoid valve 71 moves to the left from the neutral state, the hydraulic oil discharged from the pump P is supplied to the boom actuator control valve 44, the boom 5 extends, etc. When the side solenoid 71a is excited to move the interlock solenoid valve 71 to the left from the neutral state, the hydraulic oil is supplied to the jack actuator control valve 56 and the jack 8 extends.

  The solenoids 71a and 71b are excited by operating the boom operation lever 11a and the jack operation lever 12a, and the interlock control circuit 35 of the controller 30 supplies power supplied from a power source (battery) (not shown) to each solenoid. This is done by controlling supply to 71a and 71b.

  According to the hydraulic circuit 70 configured as described above, the hydraulic oil discharged from the pump P is supplied to only one of the boom actuator control valve 44 and the jack actuator control valve 46, so that the boom 5 is in operation. So-called interlock control is performed to prevent the jack 8 from being retracted (when the boom 5 is not retracted) and the boom 5 from being operated until the extension control of the jack 8 is completed.

  In the present invention, the operation of the jack 8 is allowed when the boom 5 is stored on the vehicle body 2, and the operation of the jack 8 is restricted when the boom 5 is not stored on the vehicle body 2. In addition to the conventional interlock control, the following control is performed. That is, when the upper power switch 11c is turned on, even if the boom 5 is stored on the vehicle body 2, the operation of the jack 8 is restricted regardless of the operation of the jack operation lever 12a. Control is to be performed.

  Such control is performed on the body 2 of the boom 5 from the boom storage detector 21 when it is determined by the operator boarding determination circuit 34 that an operator or the like is on the work table 7. Even when a detection signal indicating the storage of the signal is input, the interlock solenoid valve 71 is kept in a neutral state or power is supplied to the solenoid 71b by the interlock control circuit 35, and the interlock solenoid valve Since the 71 moves to the left from the neutral state, the operation of the jack 8 is restricted regardless of the operation of the jack operation lever 12a.

  In the present invention, when the upper power switch 11c is turned on, the operation of the jack 8 is restricted according to the operation of the restriction release switch 12b only when the boom 5 is stored on the vehicle body 2. Control that allows the release is performed.

  Such control is performed on the body 2 of the boom 5 from the boom storage detector 21 when it is determined by the operator boarding determination circuit 34 that an operator or the like is on the work table 7. Only when the detection signal indicating the storage of the input signal is input, the operation signal from the restriction release switch 12b is input to the controller 30, so that the interlock solenoid valve 71 is maintained in the neutral state or left from the neutral state. The restriction that moves is canceled by the interlock control circuit 35.

  Next, the above control will be described with reference to FIG. First, in FIG. 4, case2 and case4 are the same as the interlock control conventionally performed. Here, case 2 is a state in which an operator or the like is not on the work table 7 and the upper power switch 11 c is off and the boom 5 is stored in the boom receiver 9. In such a case, there is no particular problem with the safety of the operator. Therefore, the operation of the jack 8 according to the operation of the jack operation lever 12a and the release of the operation restriction of the jack 8 by the operation of the restriction release switch 12b are performed. It is possible.

  Case 4 is a state in which an operator or the like is not on the work table 7 and the upper power switch 11 c is off, and the boom 5 is not stored in the boom receiver 9. In such a case, the operation of the jack 8 in accordance with the operation of the jack operation lever 12a is impossible, but in case the adjustment of the extension amount of the jack needs to be adjusted, The operation restriction of the jack 8 according to the operation can be released.

  On the other hand, case 1 is a state in which an operator or the like is on the work table 7, the upper power switch 11 c is on, and the boom 5 is stored in the boom receiver 9. In such a case, the operation restriction of the jack 8 can be released according to the operation of the restriction release switch 12b. However, in the present invention, unlike the conventional control, even in the state where the boom 5 is stored. Even in such a case, in order to ensure the safety of the operator, the operation of the jack 8 is regulated regardless of the operation of the jack operation lever 12a. In case 1, the jack 8 can be operated according to the operation of the jack operation lever 12a when the operator turns off the upper power switch 11c.

  Further, in case 3, when an operator or the like is on the work table 7 and the upper power switch 11 c is turned on, and the boom 5 is not stored in the boom receiver 9, that is, when the boom 5 is operated, the work table 7 Is moving to a predetermined or arbitrary position and working at a high place. In such a case, the operation of the jack 8 is restricted regardless of the operation of the jack operating lever 12a, and the operation restriction of the jack 8 cannot be released by the operation of the restriction release switch 12b. Can be secured.

  The operation restriction of the jack 8 as described above and the release of the restriction can also be expressed by using a logic circuit as shown in FIG. That is, the operation of the jack 8 (operation of the jack actuator 56) is enabled when the upper power switch 11c is off and the jack operating lever 12a is operated when the boom 5 is stored in the boom receiver 9. Or when the restriction release switch 12b is turned on when the upper power switch 11c is off or the boom 5 is stored in the boom receiver 9.

  Next, a description will be given of a second embodiment of the operation restriction of the jack 8 and the release of the operation restriction using the control device for an aerial work vehicle according to the present invention. In this embodiment, these controls are performed based on the detection of the hook 83 locking state by the hook locking detector 22 provided on the work table 7. Here, however, the control is different from the first embodiment. The explanation will focus on the part.

  As shown in FIG. 6, the worker M who has boarded the work table 40 has a belt 81 wound around his / her body, and a rope with one end attached to the belt 81 and a hook 83 attached to the other end. A safety wearing band 80 consisting of 82 is attached. On the other hand, as shown in FIGS. 6 and 7, the hook locking bracket 84 is fixed to the bracket 16 of the work table 40, and the hook 83 of the safety belt 80 is locked (inserted) at the center thereof. A hook locking hole 84a is provided.

  While riding on the work table 7, the worker M keeps the hook 83 connected to himself / herself by hooking it on the hook locking hole 84 a of the hook locking metal fitting 84 attached to the work table 7. . As a result, the body of the worker M is moored on the work table 7 and is prevented from accidentally falling from the work table 7. Further, the rope 82 of the safety belt 80 is made of an insulating material, and even if the bracket 16 is made of metal, the worker M and the bracket 16 of the work table 7 are electrically insulated so that the operator M can be electrocuted. It is to be prevented.

  Further, as shown in FIG. 7, the hook locking bracket 84 has a position between a non-detection position where a part of the hook locking hole 84a is covered and a detection position where the hook locking hole 84a is completely opened without being covered. The hook locking detection operating piece 85 is provided around the hinge 85a, and a hook locking detector 22 for detecting the locking state of the hook 83 is attached to the side of the hook locking hole 84a. It has been. The hook locking detector 22 is a so-called limit switch. The hook 83 is inserted into the hook locking hole 84a, the hook locking detection operating piece 85 rotates in the direction R in FIG. 7, and the switch arm 22a is pushed upward. It is configured to output an ON signal only when The hook locking detection operating piece 85 is always urged by the spring 87 in the non-detection position direction (the direction opposite to R), so that when the hook 83 is not locked to the hook locking bracket 84, the hook engagement is achieved. The stop detector 22 outputs an off signal toward the lower controller 30b.

  In this embodiment, instead of the on / off state of the upper power switch 11c in the first embodiment, the operation restriction of the jack 8 and the release of the operation restriction are based on the detection signal from the hook locking detector 22 described above. Control is made. That is, in FIG. 4 and FIG. 5, an operator or the like is on board 7 by detecting the ON signal from the hook locking detector 22 instead of the state where the upper power switch 11 c is ON. It is judged.

  In such a case, the operation of the jack 8 (operation of the jack actuator 56) is enabled because the hook locking detector 22 detects that the hook 83 is not locked, and the boom 5 is stored in the boom receiver 9. When the jack operating lever 12a is operated in the closed state, or when the hook 83 is not locked by the hook locking detector 22 or when the boom 5 is stored in the boom receiver 9 When the restriction release switch 12b is turned on.

  Next, a description will be given of a third embodiment of the operation restriction of the jack 8 and the release of the operation restriction using the control device for an aerial work vehicle according to the present invention. In the present embodiment, these controls are performed based on the loading load of the work table 7 detected by the work table load detector 23 provided in the work table 7, but here, the control is different from the first embodiment. The description will focus on the part to be performed.

  As shown in FIG. 8, the work table load detector 23 comprises a ring disk-shaped load cell, and is mounted on the work table at the tip of the bracket 16 and the tip boom 5c, which are attached to the vertical post 6 so as to be rotatable in the horizontal direction. It is installed between the support member 15 provided so as to be able to swing up and down so as to hold 7 horizontally. When an operator gets on the work table 7 and a tool or the like is placed on the work table 7, the weight of the tool is transmitted as a compressive load to the work table load detector 23 via the bracket 16. A load, that is, a load on an operator who has boarded the work table 7 and a tool placed on the work table 7 is detected, and a load detection signal is output to the controller 30.

  In this embodiment, instead of the on / off state of the upper power switch 11c in the first embodiment, the operation restriction and operation of the jack 8 is performed based on the detection signal (load signal) from the work table load detector 23 described above. Regulation release is controlled. That is, in FIG. 4 and FIG. 5, when a load (for example, 40 kg) exceeding a predetermined value is detected by the work table load detector 23 instead of the state where the upper power switch 11c is turned on, It is determined that the person is on board.

  In such a case, the operation of the jack 8 (operation of the jack actuator 56) is enabled by detecting that the work table 7 is loaded with a predetermined load or less by the work table load detector 23. When the jack operating lever 12a is operated while the boom holder 9 is stored in the boom receiver 9, or a load less than a predetermined value is applied to the work platform 7 by the work platform load detector 23, or the boom 5 is mounted on the boom receiver. 9 when the restriction release switch 12b is operated in the state of being stored in the state No. 9.

  As mentioned above, although the 1st-3rd Example was demonstrated as an example about preferable embodiment of this invention so far, the scope of the present invention is not limited to embodiment mentioned above. In the above embodiment, the lifting device mounted on the vehicle body of an aerial work vehicle has been described as an example of a boom capable of turning, raising and lowering, and extending and retracting, but the lifting device mounted on the vehicle body is implemented. The boom is not limited to the example. For example, the present invention may be a control device in an aerial work vehicle to which a bending boom and a straight bending boom are attached as a lifting device.

  Further, it may be an aerial work vehicle to which a scissor-type link mechanism is attached as a lifting device. That is, a scissor-type link mechanism that is pivoted so as to intersect a plurality of arm members extends in the front-rear direction on the vehicle body, and is substantially the same as the chassis of an aerial work vehicle in plan view on this scissor-type link mechanism. It may be an aerial work vehicle that is configured such that a work table of a size is attached, and the work platform can be raised and lowered by moving the scissors link mechanism up and down by an extension cylinder disposed between the chassis and the scissor link mechanism. .

  Here, the effects achieved in the present invention are summarized as follows. That is, in the control device for an aerial work vehicle according to the present invention, when an operator or the like is on the worktable at the tip of the boom, even if the boom is stored on the vehicle body, The operation of the jack is regulated regardless of the operation of the jack operation means, so that when the operator is on the work table, the body is not tilted by the operation of the jack, and the work that is on the work table The safety of the person is ensured. In addition, when an operator or the like is on the work table, the jack operation control by the interlock control can be released only when the boom is stored on the vehicle body. Even if the operation for releasing the interlock control is performed, the restriction on the operation of the jack is not released, and the jack does not operate, so the jack is not ungrounded, and the safety of the worker is ensured. .

  In addition, whether or not an operator or the like is on a workbench performed to perform the interlock control as described above is determined by, for example, detecting an operation state of a workbench power supply operating means provided on the workbench. Or using a locking detection means for detecting whether or not the first locking tool connected to the worker and the second locking tool connected to the workbench are locked, or the load on the workbench This can be achieved by using a work table load detecting means for detecting the above. As described above, it is possible to configure a control device for safety of the worker at a low cost by determining the boarding of the worker by using what has been conventionally provided on the work table.

It is a perspective view of an aerial work vehicle equipped with a control device according to the present invention. It is a block diagram which shows the structure of the said control apparatus. FIG. 3 is a hydraulic circuit diagram of a portion related to interlock control of the aerial work vehicle. It is a table | surface shown about the action | operation of the jack performed by the control apparatus which concerns on this invention, and interlock release. It is a logic circuit diagram shown about the action | operation of the jack performed by the control apparatus which concerns on this invention, and interlock release. It is sectional drawing of the work bench | platform in one Embodiment of the said aerial work vehicle. It is a figure which shows the structure of the hook latching metal fitting and hook latching detector in one Embodiment of the said aerial work vehicle. It is a figure which shows the working-table periphery of the said aerial work vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Aerial work vehicle 2 Car body 4 Swivel platform 5 Boom (lifting device)
5a Base end boom (lifting device)
5b Intermediate boom (lifting device)
5c Tip boom (lifting device)
7 Work table 8 Jack 11 Upper operation device 11a Boom operation lever 11c Upper power operation switch (work table power operation means)
12 Lower operation device 12a Jack operation lever (jack operation means)
12b Regulation release switch (regulation release means)
21 Boom retract detector (boom retract detector)
22 Hook locking detector (locking detection means)
23 Work table load detector (work table load detection means)
30 Controller 30a Upper controller (operation control means)
30b Lower controller 31 Boom operation control circuit 32 Jack operation control circuit 34 Worker boarding determination circuit (worker boarding determination means)
35 Interlock control circuit (interlock device)
44 Boom Actuator Control Valve 46 Jack Actuator Control Valve 54 Boom Actuator 56 Jack Actuator 60 Control Device 71 Interlock Solenoid Valve (Interlock Device)
83 Hook (first locking tool)
84 Hook locking bracket (second locking tool)

Claims (5)

A lifting device mounted on a travelable vehicle body, a work table attached to a tip of the lifting device, a jack attached to the vehicle body to support the vehicle body, and the lifting device are stored on the vehicle body. A control device for an aerial work vehicle having an interlock device that permits operation of the jack in a state where the operation of the jack is permitted and the operation of the jack is restricted when the lifting device is not retracted on the vehicle body,
Jack operating means for operating the jack; and
Worker boarding determination means for determining whether or not an operator or the like is on the work table;
Storing detection means for detecting that the lifting device is stored on the vehicle body;
When it is determined by the worker boarding determination means that an operator or the like is on the work table, the jack operating means is in a state where the storage of the lifting device is detected by the storage detection means. A control apparatus for an aerial work vehicle, characterized in that the operation of the jack is restricted regardless of the operation. A regulation release means for performing an operation to release the regulation of the operation of the jack by the interlock device;
When it is determined by the worker boarding determination means that an operator or the like is on the work table, the restriction release means is only when the storage detection means detects the storage of the lifting device. The control device for an aerial work vehicle according to claim 1, wherein release of the restriction on the operation of the jack by the operation of is permitted. An operation control means provided on the work table and used to control the operation of the lifting device;
A work table power supply operating means for performing an on / off operation for supplying power to the operation control means provided in the work table;
The said worker boarding determination means determines with an operator etc. having boarded the said work table when the said work bench power supply operation means is turned on. Control equipment for aerial work platforms. A first locking tool attached to an operator who has boarded the work table;
A second latch attached to the workbench;
Locking detection means for detecting whether the first locking tool is locked to the second locking tool;
When the operator boarding determination means detects that the first locking tool is locked to the second locking tool by the locking detection means, an operator or the like gets on the work table. The control device for an aerial work vehicle according to claim 1, wherein the control device is determined to be. A work table load detecting means for detecting a load on the work table;
2. The operator boarding determination means determines that an operator or the like is on the work table when a load more than a predetermined value is detected by the work table load detection means. Or the control apparatus of an aerial work vehicle as described in 2.

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