JP2008105828A - High lift work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate lifting operation of a workbench and traveling of a vehicle body when a worker climbs a ladder, and to prevent electricity conduction between the vehicle body and the workbench through the ladder, in a high lift work vehicle equipped with the ladder for allowing the worker to get on/off from the workbench. <P>SOLUTION: In the high lift work vehicle, a regulating portion 62 of a controller 60 sends a regulating signal to a lifting operation control portion 61 and a traveling control portion 64 when receiving a signal that the worker climbs up the ladder by a worker climb-up detecting means, and alarm operation for regulating the lifting operation of the workbench 40 and the traveling of a traveling element 10 is carried out. A supporting member 56 which is a mounting portion between the workbench 40 and the ladder 50 is constituted by electrical insulation material, thereby preventing electricity conduction between the traveling element 10 and the workbench 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an aerial work vehicle including a work table attached via a lifting device on a travelable vehicle body and a ladder for an operator to get on and off the work table.

  An aerial work platform is a work table that is mounted on a movable vehicle body via a lifting device (a scissor-type or mast-type vertical lifting device or a boom-type lifting device that can be raised, lowered, extended, or swiveled). It is possible to work at a high place by moving the work table to a desired position by the lifting device.

  Boom-type aerial work platforms that use outrigger jacks to improve the stability of work vehicles when working at heights.Operations of outrigger jacks when an operator is on the platform or on a step for boarding the platform. Has been disclosed to prevent the operator on the workbench or step from being out of balance and becoming unstable due to the swinging or tilting of the traveling body and ensuring the safety of the operator. (See Patent Document 1).

  Particularly in boom-type aerial work platforms used for electrical work, the tip boom to which the workbench is attached is formed of an electrically insulating material, and the boom raising and lowering operation is regulated based on the boom extension state. There is known a technique that can ensure electrical insulation between the wires, and eliminate the fear of electric shock even when working on an overhead wire in a live state (see Patent Document 2).

JP 2006-21897 A Japanese Utility Model Publication No. 7-4500

  As described above, techniques for ensuring the safety of workers are known for boom-type aerial work vehicles. However, in aerial work vehicles equipped with a vertical lifting device, workers are placed on the work platform from the bottom of the vehicle body. Some have ladders to get on and off.In this case, when the operator is on the ladder, the other operator accidentally operates the elevator to raise or lower the platform without knowing it. There is a problem that it is difficult to ensure the safety of the worker on the ladder in the configuration in which the operation can be performed.

  Conventionally, in an aerial work vehicle equipped with a vertical lifting device, the electrical insulation of the work table has not been considered. However, there is a need for a live work using a vertical lift type aerial work vehicle, and there is a need for a vertical lift type aerial work vehicle having insulating properties on the work table. Some vertical lift type aerial work platforms have ladders that allow workers to get on and off the platform from the bottom of the vehicle body. In this case, electrical conduction between the vehicle body and the platform via the ladder is prevented. It is also necessary to have an insulating function.

  The present invention has been made in view of such a problem. Even though the worker is on the ladder, the other operator mistakenly notices the lifting operation of the work table or the traveling operation of the vehicle body. It is an object of the present invention to provide an aerial work vehicle having a configuration capable of preventing the occurrence of the accident.

  In addition, even when a ladder provided from the work bench to the vehicle body is provided, there is no fear of electric shock even when working on live overhead wires, and the safety of the worker can be ensured. The purpose is to provide a work vehicle.

  In order to solve the above-described problems, an aerial work vehicle according to the present invention includes a vehicle body that can travel with a traveling device, a vertical lifting device provided on the vehicle body, and a vertical lifting device that is attached to the vertical lifting device. In accordance with the operation input of a flexible work table, vertical elevating operation means (for example, upper elevating operation apparatus 42a and lower elevating operation apparatus 42b in the embodiment) for performing operation input of the vertical elevating apparatus Vertical elevating operation control means for operating the vertical elevating device (for example, elevating operation control unit 61 in the embodiment), and a ladder provided to extend from the work table to the vehicle body so that an operator can get on and off the work table And worker boarding detection means for detecting whether or not the worker is on the ladder, and that the worker boarding detection means detects that the worker is on the ladder. Vertical lift operation warning means for performing warning operation the relative workbench vertical lift operation by the vertical lift operation control means Rutoki (e.g., restricting portion 62 of the controller 60 in the embodiment) and a.

  An aerial work vehicle according to a second aspect of the present invention includes a vehicle body that is capable of traveling with a traveling device, a vertical lifting device provided on the vehicle body, and a work table that is attached to the vertical lifting device and that is vertically movable. Travel operation means for performing operation input of the travel device (for example, the upper travel operation device 43a and the lower travel operation device 43b in the embodiment), and travel for operating the travel device in accordance with the operation input of the travel operation means Control means (for example, the travel control unit 64 in the embodiment), a ladder that extends from the work table to the vehicle body, and allows an operator to get on and off the work table, and an operator gets on the ladder The vehicle boarding detection means for detecting whether or not the vehicle is running, and when the worker boarding detection means detects that the worker is on the ladder, the vehicle control unit travels the vehicle body. Travel warning means for performing warning operation for (e.g., restricting portion 62 of the controller 60 in the embodiment) and a.

  Here, the worker boarding detection means includes a ladder load detection means (for example, a worker boarding detector 80 in the embodiment) for detecting a load input of the ladder, and a load applied to the ladder by the ladder load detection means. It is comprised from the judgment means (For example, the judgment part 63 of the controller 60 in embodiment) which detects whether the worker has boarded the ladder by detecting whether it has exceeded a predetermined value. It is preferable.

  An aerial work vehicle according to a third aspect of the present invention includes a vehicle body that can travel with a traveling device, a vertical lifting device provided on the vehicle body, and a work table that is attached to the vertical lifting device and that is vertically movable. Vertical lifting operation means (for example, the upper lifting operation apparatus 42a and the lower lifting operation apparatus 42b in the embodiment) for performing operation input of the vertical lifting apparatus, and the vertical lifting apparatus according to the operation input of the vertical lifting operation means Vertical elevating operation control means (e.g. elevating operation control unit 61 in the embodiment), and a ladder provided to extend from the work table to the vehicle body so that an operator can get on and off the work table, It has an insulating function for preventing electrical conduction between the vehicle body and the work table via the ladder.

  Here, the ladder is attached to the vehicle body and extends in a vertical direction, and the ladder is attached to the work table and extends downward to vertically elevate as the work table vertically elevates and is used in combination with the lower ladder. An upper ladder that is configured so that an operator can get on and off the work table using the lower ladder and the upper ladder even when the work table is at an arbitrary height. Preferably, the lower ladder and the upper ladder are provided apart from each other and have the insulating function.

  According to the aerial work vehicle according to the present invention, when it is detected that an operator is on the ladder, an alarm operation by the alarm unit or an alarm operation by the vertical elevating operation control unit by the vertical elevating operation control unit or An alarm operation is performed by the alarm means for the travel of the vehicle body by the travel control means. Therefore, even if the worker is in the state of being on the ladder, the other person is not aware of this and accidentally performs the raising / lowering operation of the platform or the traveling operation of the vehicle body. Thus, the safety of the worker who is working is not reduced, and the safety of the worker can be ensured.

In this specification, the alarm operation means an operation including an operation for restricting the raising / lowering operation of the work table or an operation for restricting the traveling of the vehicle body, and an operation for giving an alarm using an alarm buzzer, an alarm lamp, or the like.

Further, according to another aerial work vehicle according to the present invention, a vertical lifting device is provided on the vehicle body, and the ladder is provided extending from the work table to the vehicle body so that an operator can get on and off the work table. In addition, since it has an insulation function that prevents electrical conduction between the vehicle body and the workbench via a ladder, there is no fear of electric shock even when working on live wires, and this ensures safety for workers. Can prevent accidents.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a track and field aerial work vehicle 1 as an example of an aerial work vehicle according to the present invention. This track-and-lift work vehicle 1 has a driving cabin 11 and a chassis 12 provided behind the driving cabin 11, and a plurality of wheels 13 (wheels for road traveling) provided on both the left and right sides of the driving cabin 11 and the chassis 12. A truck-type traveling body 10 that is capable of traveling on the road and a plurality of iron wheels 15 that are rotatably attached to an iron-wheel support member 14 that is attached to the lower part of the traveling body 10 so as to swing and extend downward. (Wheels for orbital travel), a turntable 16 attached to the lower center of the traveling body 10 for moving the track-and-lift work vehicle 1 onto the rails, and a box-shaped rack provided on the chassis 12 The wearing frame 20, the vertical lifting device 30 attached to the upper part of the mounting frame 20, the operator boarding work table 40 attached to the upper part of the vertical lifting device 30, and the traveling body 10 behind the traveling body 10. Bottom of Operator provided extends et workbench 40 is configured to have a ladder 50 for getting on and off the work platform 40.

  The frame for mounting 20 is attached to the chassis frame of the traveling body 10 to mount the vertical lifting device 30 and the work table 40, and stores the work table 40 having a length in the front-rear direction larger than that of the chassis 12. In order to achieve this, the box is configured to have a box shape that is approximately the same height as the driving cabin 11, approximately the same length as the longitudinal direction of the chassis 12, and approximately the same length as the lateral dimension of the chassis 12. It is provided on the chassis 12 for the purpose of improving the mountability.

  The vertical elevating device 30 attached to the upper part of the frame for frame 20 has a pair of left and right plane link mechanisms 30a on the frame for frame 20 (only the link mechanism 30a on the left side of the vehicle body is shown in FIG. The left link mechanism 30a will be described as an example.), And the planar link mechanism 30a crosses two link bars together, and the intersection is rotatably connected. Scissors link mechanism. The scissor link mechanism 30a connects two link bars 31a and 32a that intersect each other by a left and right horizontal support shaft P1, and rotates the link bars 31a and 32a around the left and right horizontal support shaft P1 to thereby It expands and contracts in the vertical direction.

  These scissor link mechanisms 30a are provided with a lifting hydraulic cylinder 33 (see FIG. 2) that raises and lowers the link bar 31a up and down around the lower end of the frame 20 for bodywork. The lower end of the link bar 31a is pivotally connected to the mounting frame 20 by the left and right horizontal support shaft P2, and the lower end of the link bar 32a is attached to the mounting frame 20 to be slidable back and forth by the left and right horizontal support shaft P3. Yes. The upper end of the link bar 31a is slidably attached to the bottom surface of the work table 40 by the left and right horizontal support shaft P4, and the upper end of the link bar 32a is pivotally connected to the bottom surface of the work table 40 by the left and right horizontal support shaft P5. ing. As a result, the vertical elevating device 30 can be vertically expanded and lowered by the elevating hydraulic cylinder 33, and the work table 40 can be moved up and down relative to the bodywork frame 20 and the chassis 12.

  On the work table 40, a handrail 41 for preventing the operator from falling, an upper lifting operation device 42a for performing the lifting operation of the vertical lifting device 30, and a traveling operation of the traveling body 10 (traveling on a track using the iron wheel 15). The upper traveling operation device 43a for performing the operation) is provided. Further, a lower lifting operation device 42b (see FIG. 2) for performing the lifting operation of the vertical lifting device 30 is provided on the side surface of the traveling body 10, and the traveling operation (using the wheels 13) of the traveling body 10 is performed in the driving cabin 11. A lower traveling operation device 43b (see FIG. 2, which is a pedal and a lever for driving an ordinary truck) is provided for performing a traveling operation on a road and a traveling operation on a track using an iron wheel 15. It has been.

  The track-and-terrain work vehicle 1 can swing the iron wheel support member 14 upward to store the iron wheel 15, ground the wheel 13, and drive on the road, and swing the iron wheel support member 14 downward. It is also possible to travel on the track by placing the iron wheel 15 on the track (rail). The turntable 16 is used when this travel is switched, that is, when travel switching from road travel to track travel or reverse travel switching is performed. For example, in the transition from road traveling to track traveling, the roadside work vehicle 1 travels on the road, moves to the railroad crossing closest to the work site, stops across the track, and is used as a turntable overhanging storage cylinder (see FIG. (Not shown) is actuated to project the turntable 16 downward, and the traveling body 10 is lifted and supported by the turntable 16. Next, a hydraulic motor (not shown) provided in the traveling body 10 is operated to rotate the turntable 16 horizontally, thereby turning the traveling body 10 about 90 degrees with respect to the ground. When the iron wheel overhanging storage cylinder (not shown) is operated, the iron wheel 15 is projected downward, and the iron wheel 15 is positioned on the rail while the turntable 16 is stored. As a result, the track-and-terrain work vehicle 1 is transferred from the road onto the rail.

  When the transfer onto the rail is completed, the iron wheel 15 (orbital traveling wheel) is driven to rotate from the driving cabin 11 through the traveling device 70 (see FIG. 2) provided in the traveling body 10 to move on the rail. Can move around. This traveling movement is also possible from the upper traveling operation device 43a on the work table 40, but depending on the upper traveling operation device 43a, only traveling at a low speed is possible for safety. When the operator arrives at the work site, the operator gets on the work table 40 using the ladder 50, operates the upper lifting operation device 42a to extend and retract the vertical lifting device 30, and moves the work table 40 to a desired height position. It can be moved to and work.

  As shown in FIG. 2, the railroad aerial work platform 1 includes a controller 60 to which operation signals output by operations of the upper elevating operation device 42 a and the lower elevating operation device 42 b are input. This is input to the raising / lowering operation control unit 61 of the controller 60. The lift operation control unit 61 directly drives the lift control valve V based on operation signals from the upper lift operation device 42a and the lower lift operation device 42b. The raising / lowering control valve V controls the hydraulic pressure supply from the hydraulic pump P to the raising / lowering hydraulic cylinder 33, whereby the vertical raising / lowering device 30 is vertically expanded and lowered to raise and lower the work table 40 with respect to the bodywork frame 20. Operation control can be performed. The hydraulic pump P is provided in the traveling body 10 and is rotationally driven by an engine, an electric motor, or the like (not shown), and supplies hydraulic pressure to the lifting hydraulic cylinder 33 via the lifting control valve V.

  The controller 60 further includes a travel control unit 64 that receives operation signals from the upper and lower travel operation devices 43a and 43b, and the travel control unit 64 is output by operation of the upper travel operation device 43a and the lower travel operation device 43b. Based on the operation signal, the plurality of wheels 13 are generated by the operation signal from the lower travel operation device 43b via the travel device 70 (the travel device 70 includes an unillustrated engine, an iron wheel drive hydraulic motor, a transmission, a propeller shaft, and the like). (Road running wheels) are driven to rotate, and a plurality of iron wheels 15 (orbital running wheels) are driven to rotate by operation signals from the upper and lower travel operation devices 43a and 43b. Thereby, operation control of road running and track running can be performed.

  The controller 60 also includes a determination unit 63 that receives a detection signal from the worker boarding detector 80 and a restriction unit 62 that receives the determination signal from the determination unit 63 and outputs a restriction signal. The worker boarding detector 80 detects whether or not a worker is on the ladder 50, and includes, for example, a ladder load detector that detects a load acting on the ladder. A detection signal from the worker boarding detector 80 is sent to the determination unit 63, where it is determined whether or not a person is on the ladder 50. 62. When the restriction unit 62 receives a signal that it is determined that a person is riding, the restriction unit 62 sends a restriction signal to the lift operation control unit 61 to stop the supply of hydraulic oil to the lift hydraulic cylinder 33 by the lift control valve V, thereby An alarm operation is performed in which the lifting / lowering operation of 40 is restricted or a restriction signal is sent to the traveling control unit 64 to stop the rotational drive of the wheel 13 or the iron wheel 15 by the traveling device 70 and restrict the traveling. At this time, the alarm device 90 is activated at the same time, and an alarm operation by an alarm lamp, a buzzer or the like is also performed.

  This configuration will be specifically described. A ladder load detector constituting the worker boarding detection means 80 is, for example, a load cell provided on the ladder 50 and a load applied to the ladder 50 (the weight of the worker boarding the ladder 50). ) Is detected. The determination unit 63 of the controller 60 receives information on the load applied to the ladder 50 detected by the worker boarding detection means 80, determines whether or not the load applied to the ladder 50 exceeds a predetermined value. 50, it is determined whether an operator is on board. When it is determined that the load applied to the ladder 50 exceeds the predetermined value, the worker boarding detection signal is output to the restricting unit 62 of the controller 60, assuming that the worker is on the ladder 50. The predetermined value is a load value (load value) that the operator boarding detector 80 is supposed to indicate at least in a state where the operator is on the ladder 50 and is arbitrary in consideration of the weight of the operator. Set to Further, as shown in FIG. 5, the worker boarding detector 80 includes a ladder, such as a simple method using a spring SP and a limit switch SW, or a method of providing a limit switch for detecting the storing of the ladder 50 and substituting the signal. Various methods are conceivable depending on the 50 shapes.

  When the worker boarding detection means detects that the worker is on the ladder 50, that is, the regulation unit 62 of the controller 60 applies a load applied to the ladder detected by the worker boarding detector 80 in advance. When the determination unit 63 of the controller 60 determines that the predetermined predetermined value is exceeded and outputs an operator boarding detection signal, the vertical movement of the vertical lifting device 30 performed by the vertical movement control unit 61 of the controller 60 is restricted. Or the rotational drive of the wheel 13 or the iron wheel 15 performed by the traveling control unit 64 is regulated.

  Further, an alarm buzzer, an alarm lamp, or a display is provided on the periphery of the upper lifting operation device 42a, the upper traveling operation device 43a, the lower lifting operation device 42b, and the lower traveling operation device 43b on the work table 40. An alarm device 90 including a display device or the like is provided. This warning device 90 receives a command from the lifting / lowering operation controller 61 of the controller 60 in a state in which it is detected that the worker is on the ladder 50 by the worker boarding detection means. The lifting / lowering operation of the controller 30 is restricted, and alarm regulation for issuing a warning that the vertical lifting / lowering device 30 does not move up / down even when the upper lifting / lowering operating device 42a and the lower lifting / lowering operating device 42b are operated is performed. In response to a command from the control unit 64, an alarm (alarm that the traveling body 10 is regulated and the traveling body 10 does not travel even if the upper traveling operation device 43a and the lower traveling operation device 43b are operated) is issued. Perform alarm regulation. The alarm regulation is a sound or buzzer sound for an alarm buzzer, a lamp light for an alarm lamp, and a character or the like for a display display device.

  According to the track-and-terrain work vehicle 1 having such a configuration, although the worker is on the ladder 50, the other operator is not aware of this, and the raising / lowering operation of the work table 40 or the traveling body 10 is erroneously performed. When the traveling operation has been performed, the lifting / lowering operation of the work table 40 is regulated, the traveling of the traveling body 10 is regulated, and the alarm device 90 regulates the alarm, so that the work on the ladder 50 is performed. Therefore, the safety of the worker on the ladder 50 is ensured.

  Next, the ladder 50 provided at the rear part of the vehicle body will be described. As shown in FIGS. 1 and 3, the ladder 50 includes a pair of side frames 51a and 51a arranged horizontally in the vertical direction, and a plurality of step members 51b horizontally mounted between the side frames 51a and 51a. A side ladder portion 51, a pair of side frames 52a, 52a arranged horizontally in the vertical direction, and an upper ladder portion 52 having a plurality of step members 52b horizontally mounted between the side frames 52a, 52a, and a lower ladder portion The upper end portion 51 and the lower end portion of the upper ladder portion 52 are composed of a plurality of holding means 53 that hold each other in an overlapping state. A lower side portion of the ladder 50 (an intermediate side portion between both side frames 51a and 51a of the lower ladder portion 51) is formed by using a pair of connecting arms 55 on a support member 54 fixed to the rear lower end of the mounting frame 20. The left and right horizontal support shafts P6, P6, P7, and P7 are pivotally supported, and the upper end portion of the ladder 50 (the upper end portion of the upper ladder portion 52) protrudes rearward from the rear lower end portion of the work table 40. The support member 56 is pivotally supported by left and right horizontal support shafts P8 and P8 so as to be able to swing back and forth, and is inclined so that the lower end side of the ladder 50 is farther away from the traveling body 10 when the worker moves up and down the work table 40. It has come to be. When the work table 40 is in the retracted state (when the work table 40 is in the lowest position), the ends of the pair of connecting arms 55 on the ladder 50 side are moved upward so that the ladder 50 is mounted on the frame. 20 is stored along the rear side of 20 (ladder 50 is stored in a vertical posture).

  As shown in FIG. 3, the holding means 53 is attached to the left and right sides of the upper end portion of the lower ladder portion 51 that overlaps the rear side of the lower ladder portion (the side on which the operator moves up and down) of the upper ladder portion 52. A pair of left and right L-shaped holding members 53a, 53a for holding the left and right side frames 52a, 52a of the portion 52 and the left and right side frames of the lower ladder portion 51 attached to the left and right sides of the lower end portion of the upper ladder portion 52 A pair of left and right L-shaped holding members 53b and 53b for holding 51a and 51a from both left and right sides are provided, and a synthetic resin sliding material is provided on the L-shaped inner surfaces of these L-shaped holding members 53a, 53a, 53b and 53b. S is stretched.

  Since the ladder 50 is configured as described above, the lower ladder portion 51 and the upper ladder portion 52 are coupled to each other by L-shaped holding members 53a, 53a, 53b, and 53b so that only relative movement in the length direction is possible at the overlapping portions of the end portions. ing. When the ladder 50 is extended and contracted, the pair of left and right L-shaped holding members 53a and 53a at the upper end portion of the lower ladder portion 51 are attached to the left and right side frames 52a and 52a of the upper ladder portion 52 through the synthetic resin sliding material S inside. The pair of left and right L-shaped holding members 53b and 53b at the lower end portion of the upper ladder portion 52 are moved downward relative to the lower ladder portion 51 via the synthetic resin sliding material S inside. Relative to the left and right side frames 51a and 51a.

  Therefore, even when the ladder 50 is inclined in advance, when the work table 40 is raised by extending the vertical elevating device 30 and the elevating hydraulic cylinder 33, the upper ladder portion 52 becomes the lower ladder portion 51. As a result, the ladder 50 is extended while being changed in a direction in which the inclination angle of the entire ladder 50 is reduced (see the change in position of the work table and the ladder indicated by the two-dot chain line and the solid line in FIG. 1). On the contrary, when the vertical elevating device 30 and the elevating hydraulic cylinder 33 are reduced and the work table 40 is lowered, the upper ladder portion 52 is lowered with respect to the lower ladder portion 51, and the inclination angle of the entire ladder 50 is increased. The ladder 50 is reduced while changing in direction. That is, the ladder 50 is connected between the traveling body 10 and the work table 40 in an inclined posture or a vertical posture (ladder retracted posture) regardless of the height of the work table 40 with respect to the traveling body 10, and the worker is inclined. It is possible to easily ascend and descend to the work table 40 using the ladder 50 having the posture described above.

  An upper end portion of the upper ladder portion 52 is pivotally supported by a support member 56 protruding rearward from the rear lower end portion of the work table 40 so as to be swingable back and forth by left and right horizontal support shafts P8 and P8. Is made of an electrically insulating material, and electrical conduction between the traveling body 10 and the work table 40 can be prevented via the ladder 50. Even if the electrical connection between the traveling body 10 and the work table 40 is prevented via the ladder 50 by configuring the attachment portion of the ladder 50 and the work table 40 with an electric insulation material, the ladder 50 itself is electrically insulated material. You may comprise. In addition, it is necessary that electrical conduction between the work table 40 and the vertical lifting device 30 and the chassis 12 is also prevented, and a mounting structure of the work table 40 and the vertical lifting device 30 is made up of an electrically insulating material or a frame for mounting. A plurality of frame pillars configured in the vertical direction with respect to the 20 chassis 12 are made of an electrically insulating material to prevent electrical conduction between the traveling body 10 and the work table 40.

  According to such a configuration, since it has an insulating function for preventing electrical conduction between the traveling body 10 and the work table 40 via the ladder 50, there is no fear of electric shock even when working on live overhead wires. It is possible to ensure the safety of the worker and prevent such an accident.

  Also, a different embodiment of the ladder will be described with reference to FIG. As shown in FIG. 4, a ladder 100 for an operator to get on and off the work table 40 includes a lower ladder 101 attached to the mounting frame 20, and a vertical lift operation of the work table 40 attached to the work table 40. Accordingly, an upper ladder 120 that vertically moves up and down is provided, and the lower ladder 101 and the upper ladder 120 are provided apart from each other. The lower ladder 101 includes a pair of side frames 102 and 102 that are horizontally disposed in the vertical direction, and a plurality of step members 103 that are horizontally mounted between the side frames 102 and 102.

  An upper end portion of the lower ladder 101 is provided below a step plate 104 on a support member 105 having a step plate 104 that protrudes rearward from the rear upper end of the frame for mounting 20 and extends upward and is horizontally attached to the upper end portion. A tread plate 106 projecting horizontally to the rear of the wearing frame 20 is pivotally supported by a left and right horizontal support shaft 107 so as to be swingable back and forth, and an intermediate portion of the lower ladder 101 is fixed to a rear lower end of the mounting frame 20. The support member 108 is pivotally supported by left and right horizontal support shafts 110, 110, 111, 111 using a pair of connecting arms 109, 109, and when the operator gets on and off the work table 40, the lower ladder The lower end side of 101 is inclined backward from the traveling body 10. The upper ladder 120 includes a pair of side frames 121, 121 arranged horizontally in the vertical direction, and a plurality of step members 122 laid across the side frames 121, 121. The upper ladder 120 is fixed to a support member 123 protruding rearward from the rear lower end portion of the work table 40, and pipes 124, 124 extending by its own weight are provided on both side frames 121, 121 at the lower end portion of the upper ladder 120. It is provided inside the door so that it can be moved in and out.

  In the ladder 100 configured as described above, the upper ladder 120 moves up and down in accordance with the vertical raising and lowering operation of the work table 40, so that the work ladder 40 is in the retracted state (when the work table 40 is in the lowest lowered state). It is necessary to set the vertical lengths of the side frames 121 and 121 so as not to interfere with the wearing frame 20 and the chassis 12. Therefore, depending on the raised height position of the work table 40, a space may be generated between the lower ladder 101 and the upper ladder 120. At that time, the operator can easily board the step board 106 using the lower ladder 101 and further board the work table 40 using the upper ladder 120 via the step board 104. In addition, the pipes 124, 124 provided at the lower end of the upper ladder 120 so as to be freely retractable inside the both side frames 121, 121 are set to a length extending below the upper end of the frame 20 for mounting, The operator who is on the step plate 104 or the step platform 106 is prevented from entering the space formed between the lower ladder 101 and the upper ladder 120 and the platform 40 is lowered. It is provided in order to prevent the lower end portion of the upper ladder 120 and the upper end portion of the step plate 104 or the mounting frame 20 from interfering with each other when the work table 40 is shaken during operation.

  According to the ladder 100 having such a configuration, since the lower ladder 101 and the upper ladder 120 are provided apart from each other, the ladder can be used without using an insulating material for the support portion or the ladder itself using an insulating material. The structure which has the insulation function which blocks | prevents the electrical continuity with the traveling body 10 and the work bench 40 via 100 can be taken easily.

  The preferred embodiments of the present invention have been described so far, but the scope of the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, the ladder 50 for the operator to get on and off the work table 40 is a slide-type ladder having a shape in which two extendable ladders are stacked in accordance with the lifting operation of the work table. It is not limited to the shape of the ladder, such as providing a retractable folding ladder instead of the sliding ladder. In the above-described embodiment, the support member 56 is made of an electrically insulating material in order to prevent electrical conduction between the traveling body 10 and the work table 40 via the ladder 50. However, the ladder 50 itself is made of an electrically insulating material. May be. Furthermore, guides may be provided in place of the pipes 124 and 124 for preventing an operator from entering the space formed between the lower ladder 101 and the upper ladder 120.

  According to the track-and-terrain work vehicle 1 having such a configuration, although the worker is on the ladder 50, other operators do not notice it and the operation of the vertical lifting device 30 or the traveling device 70 is erroneously performed. , The lifting / lowering operation of the vertical lifting device 30 is restricted, the traveling of the traveling body 10 is restricted, and the warning device 90 performs warning restriction, so that the safety of the worker on the ladder 50 is improved. It will not be lowered, and the safety of the worker on the ladder 50 is ensured. In addition, since it has an insulating function that prevents electrical conduction between the traveling body 10 and the work table 40 via the ladder 50, there is no fear of electric shock even when work is performed on a live-wired overhead line, and the safety of the worker is thereby improved. As well as ensuring this, accidents like this can be prevented.

  The form of the aerial work vehicle in the present invention is not limited to that shown in the above-described embodiment. That is, the position and shape of the ladder 50 for the operator to get on and off the work table 40 shown in the above-described embodiment are merely examples, and the present invention can be applied to all types of aerial work vehicles.

It is a side view of an example of a track and land work vehicle according to the present invention. It is a block diagram which shows the structure of the operating device which concerns on this invention. It is a figure which shows the structure of the overlapping part of a ladder, (A) is a side view, (B) is sectional drawing. It is a perspective view which shows the structure of the ladder which concerns on embodiment from which the said embodiment differs. It is a side view which shows the structure of the worker boarding detection means which concerns on the modification of the said Example, (A) is the state in which the ladder 50 is not loaded, (B) is the state in which the ladder 50 was loaded. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Railroad high altitude work vehicle 10 Traveling body 30 Vertical raising / lowering device 40 Work table 42a Upper vertical raising / lowering operating device 42b Lower vertical raising / lowering operating device 43a Upper traveling operating device 43b Lower traveling operating device 50 Ladder 60 Controller 61 Elevating operation control device 62 Restriction part 63 Judgment Unit 64 Traveling Control Unit 80 Worker Boarding Detector 90 Alarm Device

Claims (5)

A vehicle body capable of traveling with a traveling device;
A vertical lifting device provided on the vehicle body;
A workbench that is attached to the vertical lifting device and is vertically movable;
Vertical lifting operation means for performing an operation input of the vertical lifting device;
Vertical elevating operation control means for operating the vertical elevating device in response to an operation input of the vertical elevating operation means;
A ladder extending from the work table to the vehicle body for an operator to get on and off the work table;
Worker boarding detection means for detecting whether a worker is on the ladder;
A vertical elevating operation alarm for performing an alarm operation on the vertical elevating operation of the work table by the vertical elevating operation control means when it is detected by the operator boarding detecting means that an operator is on the ladder Means,
An aerial work vehicle characterized by comprising: A vehicle body capable of traveling with a traveling device;
A vertical lifting device provided on the vehicle body;
A workbench that is attached to the vertical lifting device and is vertically movable;
Traveling operation means for performing operation input of the traveling device;
Travel control means for operating the travel device in response to an operation input of the travel operation means;
A ladder extending from the work table to the vehicle body for an operator to get on and off the work table;
Worker boarding detection means for detecting whether a worker is on the ladder;
Travel warning means for performing a warning operation on the travel of the vehicle body by the travel control means when it is detected by the worker boarding detection means that an operator is on the ladder;
An aerial work vehicle characterized by comprising: The worker boarding detection means is
Ladder load detecting means for detecting the load input of the ladder;
Determining means for detecting whether or not a load on the ladder exceeds a predetermined value by the ladder load detecting means and determining whether or not an operator is on the ladder;
The aerial work vehicle according to claim 1, further comprising: A vehicle body capable of traveling with a traveling device;
A vertical lifting device provided on the vehicle body;
A workbench that is attached to the vertical lifting device and is vertically movable;
Vertical lifting operation means for performing an operation input of the vertical lifting device;
Vertical elevating operation control means for operating the vertical elevating device in response to an operation input of the vertical elevating operation means;
A ladder extending from the work table to the vehicle body for an operator to get on and off the work table;
An aerial work vehicle characterized by having an insulating function of preventing electrical conduction between the vehicle body and the work table via the ladder. The ladder is
A lower ladder attached to the vehicle body and extending in the vertical direction;
An upper ladder that is attached to the workbench and extends downward and vertically elevates as the workbench vertically elevates and is used in combination with the lower ladder;
The operator can get on and off the work table using the lower ladder and the upper ladder even when the work table is at an arbitrary high position, and the lower ladder and the The aerial work vehicle according to claim 4, wherein an upper ladder is provided apart from each other and has the insulating function.

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