JP2005022787A - Safety device for equipment-mounted working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device for an equipment-mounted working vehicle configured to surely prevent a state of making a worker fall into a non-safety state due to an erroneous traveling of a vehicle in spite of a working state. <P>SOLUTION: When either one of the detection of a non-operation state of a hydraulic pump P by a hydraulic pump operation state detection device 83, the detection of a position except a neutral position of a transmission T by a neutral detection device 82, and the detection of non-braking states of traveling wheels 11 by a traveling wheel braking detection device 81 is performed in a state in which grounding of at least one of four outrigger jacks 13 on the ground is detected by a grounding detection device 84, a controller 50b outputs an alarm signal. An alarm output device 44 gives an alarm to the worker based on the alarm signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
More particularly, the present invention relates to a bodywork vehicle that is configured to include a bodywork on a traveling body, and more particularly, because a vehicle is erroneously traveled even though it is in a work state, the worker is in an unsafe state. The present invention relates to a safety device for a bodywork vehicle that can prevent a situation of falling into a vehicle.
[0002]
[Prior art]
A bodywork work vehicle is a vehicle having a body mounted with a bodywork driven by a hydraulic actuator, such as an aerial work vehicle having a work table for boarding a worker movably provided on the body. It has been. Such a bodywork work vehicle is provided with an outrigger jack that supports a traveling body in operation in a stable state, and is used by projecting downward before starting work (see, for example, Patent Document 1 below).
[0003]
Some of these outrigger jacks are extended until they stand on the ground (until the so-called ground cutting state), so that the traveling body is lifted and supported. However, the outrigger jacks are extended until the lower end is in contact with the ground. There is also one (so that the extension operation stops when the lower end touches the ground). This is effective in a vehicle or the like that performs an operation that wants to increase the stability of the traveling body but does not lift and support the traveling body.
[0004]
[Patent Document 1]
JP 2002-308596 A
[0005]
[Problems to be solved by the invention]
However, when the traveling body is supported by the outrigger jack, if the outrigger jack is extended to a ground cutting state in which the traveling wheel (tire wheel) is floated from the ground, the traveling wheel will not move even if the vehicle is erroneously operated. The vehicle does not actually run away simply by idling, but when the outrigger jack only protrudes until it touches the ground, the vehicle can run with the outrigger jack protruding, and the vehicle will run away. Not only damages the outrigger jack, but also puts an operator (for example, an operator working on a work table or an operator in the vicinity of the vehicle in an aerial work vehicle) into an unsafe state. There was a risk of causing it. In addition, if the bodywork is a work for working at a high place, if the vehicle is accidentally driven after the work at a high place and before storing the bodywork, There was a risk that the worker would lose his posture.
[0006]
The present invention has been made in view of such a problem, and it is possible to reliably prevent the worker from falling into an unsafe state because the vehicle has been accidentally driven in spite of being in a working state. An object of the present invention is to provide a safety device for a bodywork vehicle having a configuration that can be prevented.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, a safety device for a bodywork vehicle according to the first aspect of the present invention includes a traveling body that travels by driving traveling wheels by a prime mover (for example, engine E in the embodiment), and a traveling body. The bodywork (for example, the revolving body 20, the refraction boom 30 and the work table 40 in the embodiment) provided above, and the hydraulic actuators (for example, the revolving motor 23, the hoisting cylinder 24 in the embodiment, The telescopic cylinder 33 and the bending cylinder 36), a hydraulic pump that supplies hydraulic oil to the hydraulic actuator, and a plurality of outrigger jacks that are provided in the traveling body and project downward from the retracted state to stably support the traveling body. Parking device in which a traveling wheel is provided on a traveling body, which is a safety device for a bodywork vehicle (for example, an aerial work vehicle 1 in the embodiment) Whether or not the traveling wheel braking detection means (for example, traveling wheel braking detector 81 in the embodiment) for detecting whether the vehicle is more braked and the transmission for transmitting the power of the prime mover to the traveling wheel are in the neutral position. Neutral detecting means for detecting (for example, neutral detector 82 in the embodiment) and hydraulic pump operating state detecting means for detecting whether or not the hydraulic pump is in an operating state (for example, a hydraulic pump operating state detector in the embodiment) 83), ground detection means (for example, ground detector 84 in the embodiment) for detecting whether or not each of the plurality of outrigger jacks is in contact with the ground, and a plurality of outrigger jacks by the ground detection means. Oil detected by the hydraulic pump operating state detecting means in a state where at least one of them is grounded. An alarm signal is output when any one of detection of the non-operating state of the pump, detection of a position other than the neutral position of the transmission by the neutral detection means, and detection of non-braking of the traveling wheel by the traveling wheel braking detection means is detected. Alarm signal output means for outputting (for example, the second controller 50b in the embodiment) and alarm output means for outputting an alarm based on the alarm signal output from the alarm signal output means (for example, the alarm output device 44 in the embodiment) With.
[0008]
Further, the safety device for a bodywork vehicle according to the second aspect of the present invention includes a traveling body that travels by driving traveling wheels by a prime mover (for example, the engine E in the embodiment), and a high place provided on the traveling body. Working bodywork (for example, revolving body 20, refraction boom 30 and work table 40 in the embodiment) and hydraulic actuator for operating the bodywork (for example, revolving motor 23, hoisting cylinder 24, and telescopic cylinder in the embodiment) 33 and a bending / extending cylinder 36), and a safety device for a bodywork vehicle (for example, an aerial work vehicle 1 in the embodiment) configured to include a hydraulic pump that supplies hydraulic oil to a hydraulic actuator. Traveling wheel braking detection means (for example, traveling wheel braking detector 81 in the embodiment) for detecting whether or not the vehicle is braked by a parking brake provided on the traveling body; Neutral detection means (for example, the neutral detector 82 in the embodiment) for detecting whether or not the transmission for transmitting the motive power to the traveling wheels is in the neutral position, and whether or not the hydraulic pump is in an activated state. Hydraulic pump operating state detecting means for detecting (for example, the hydraulic pump operating state detector 83 in the embodiment) and storage detecting means for detecting whether the bodywork is in a predetermined storage posture (for example, in the embodiment) Before the boom storage detector 85) and the storage detection means detect that the body is in the storage position, the hydraulic pump operating state detection means detects the hydraulic pump inactive state, and the neutral detection means shifts. Any one of detection of a position other than the neutral position of the machine and detection of non-braking of the traveling wheel by the traveling wheel braking detection means was detected. Alarm signal output means (for example, the second controller 50b in the embodiment) that outputs an alarm signal at the time, and alarm output means (for example, in the embodiment) that outputs an alarm based on the alarm signal output from the alarm signal output means An alarm output device 44).
[0009]
Here, in the safety device for a bodywork vehicle according to the first and second aspects of the present invention, the bodywork moves the work table and the work table (for example, the revolving body 20 and the refraction in the embodiment). In the case of the boom 30), the alarm output means is preferably provided on the work table.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows an aerial work vehicle as a bodywork work vehicle equipped with a safety device according to the present invention. The aerial work vehicle 1 is a so-called refraction boom type aerial work vehicle, and includes driving wheels (tire wheels) 11, 11,... Driven by the power of the engine E (see FIG. 1). The track-type traveling body 10 capable of traveling from the beginning, a revolving body (swivel column) 20 provided on the traveling body 10, and a base end portion is supported on the upper portion of the revolving body 20 via a foot pin 21. A refraction boom (hereinafter simply referred to as a boom) 30 and an operator boarding work table 40 attached to the tip of the boom 30 are configured.
[0011]
The revolving unit 20 is attached to the rear position of the driving cabin 12 on the traveling unit 10 so as to be rotatable 360 degrees around the vertical axis. A swing motor (hydraulic motor) 23 (see FIG. 1) is provided inside the traveling body 10. By rotating the swing motor 23, the swing body 20 is rotated about the vertical axis via a gear (not shown). It can be swiveled. The boom 30 includes a lower boom 31 and an upper boom 32, and the lower boom 31 includes a first boom member 31a and a second boom member 31b that are configured to be nested.
[0012]
An extendable cylinder (hydraulic cylinder) 33 (see FIG. 1) is provided in the lower boom 31 so as to extend in the axial direction of the lower boom 31, and each boom member 31 a constituting the lower boom 31 by the expansion and contraction operation of the extendable cylinder 33. The entire lower boom 31 can be expanded and contracted in the axial direction by relatively moving 31b. Further, a hoisting cylinder (hydraulic cylinder) 24 is straddled between the first boom member 31 a located on the lower stage side of the lower boom 31 and the revolving body 20, and the lower boom 31 is operated by extending and retracting the hoisting cylinder 24. Can be moved up and down in a vertical plane.
[0013]
The upper boom 32 is attached to the tip of a second boom member 31b located on the upper side of the lower boom 31 via a pivot shaft 34, and a link mechanism 35 is provided between the second boom member 31b and the upper boom 32. It has been. The link mechanism 35 is pivotally supported at the other end of a bending / extending cylinder (hydraulic cylinder) 36 whose one end is pivotally supported by the upper boom 32. By operating the bending cylinder 36 to extend and contract, the upper boom 32 is moved relative to the lower boom 31. Can be bent and extended (refractive) in the vertical plane.
[0014]
A worktable support post 37 is provided at the tip of the upper boom 32 so as to extend upward. The worktable support post 37 is supported so as to be swingable in a vertical plane via a swing shaft (not shown), and is always held in a vertical posture by a leveling device (not shown).
[0015]
The work table 40 has a box shape, and is rotatably attached to the upper end portion of the work table support post 37 via a work table holding bracket 41 that protrudes to the outside. A swing motor (electric motor) 42 (see FIG. 1) is provided inside the work table holding bracket 41. By rotating the swing motor, the work table 40 is entirely moved around the work table support post 37. Can be swung (horizontal turning). Here, since the worktable support post 37 is always kept in the vertical posture as described above, the floor surface of the worktable 40 is always held horizontally regardless of the undulation angle of the boom 30.
[0016]
Outrigger jacks 13, 13,... For supporting the traveling body 10 in a stable state are provided at the front, rear, left and right locations (four locations) of the traveling body 10. Each outrigger jack 13 includes a jack cylinder 13a that is fixed to the traveling body 10 and extends in the vertical direction, and a ground plate 13b that is swingably attached to a lower end portion of the jack cylinder 13a. These outrigger jacks 13 are in a retracted state in which the jack cylinder 13a is fully contracted when the vehicle is running, and the jack cylinder 13a is extended at the work site so that the grounding plate 13b is grounded to the ground. By doing, the traveling body 10 can be stabilized with respect to the ground.
[0017]
Further, in the traveling body 10, the hydraulic actuators (the turning motor 23, the hoisting cylinder 24, the telescopic cylinder 33, the bending cylinder 36) and the jacks for operating the revolving body 20 and the boom 30 that are moving devices of the work table 40 are provided. In addition to the hydraulic pump P that supplies hydraulic oil to the cylinder 13a, a transmission (transmission) T that transmits the power of the engine E to the traveling wheels 11, 11,. A power take-off PTO, which is a power take-off mechanism for driving the pump P, is provided (see FIG. 1). The driving cabin 12 is provided with a PTO operation lever 71 that can be tilted between an on position and an off position. When the PTO operation lever 71 is located at the off position, the power take-off PTO is operated by the engine E. The power of the engine E is transmitted only to the transmission T, and when the PTO operation lever 71 is located at the on position, a part of the power of the engine E is transmitted to the hydraulic pump P.
[0018]
The hydraulic oil discharged from the hydraulic pump P is supplied to the turning motor 23 via the first control valve 51 and is supplied to the undulation cylinder 24 via the second control valve 52. The hydraulic oil discharged from the hydraulic pump P is supplied to the expansion / contraction cylinder 33 via the third control valve 53 and is supplied to the bending / extension cylinder 36 via the fourth control valve 54. The first controller 50 a provided in the traveling body 10 is electrically connected to the first to fourth control valves 51, 52, 53, 54, and the work table moving operation device 43 provided on the work table 40. The spools (not shown) of the first to fourth control valves 51, 52, 53, and 54 are electromagnetically driven based on the operation signal output by the above operation. For this reason, an operator on the work table 40 operates the work table moving operation device 43 to move the hydraulic actuators (the turning motor 23, the hoisting cylinder 24, the telescopic cylinder 33 and the bending cylinder 36) in a desired direction and a desired operating speed. Can be operated with. The swing motor 42 for swinging the work table 40 can be operated and operated directly from the work table moving operation device 43 (not via the first controller 50a).
[0019]
Further, the hydraulic oil discharged from the hydraulic pump P is supplied to the jack cylinder 13 a of each outrigger jack 13 via the fifth control valve 55. The fifth control valve 55 can be actuated via the first controller 50a by operating a jack operating lever 72 (see FIG. 1) provided on the side of the traveling body 10, and the operator can operate the jack operating lever. By operating 72, the jack cylinders 13a corresponding to the four outrigger jacks 13 can be extended and contracted. In FIG. 1, only one fifth control valve 55 and one jack cylinder 13a are shown, but in actuality, the number of the fifth control valve 55 and the jack cylinder 13a is equal to the number of outrigger jacks 13 (four). Exists.
[0020]
In the aerial work platform 1, the boom 30 is set in a predetermined retracted posture when traveling on a general road. The boom 30 is stored by lowering the boom 30 until the boom 30 is in a substantially horizontal position after the boom 30 is fully retracted and swung so that the tip portion is directed toward the rear of the traveling body 10. In the retracted posture of the boom 30, the lower surface of the boom 30 is placed on the upper part of the boom placing column 14 (see FIG. 2) provided to extend upward at the rear portion of the traveling body 10.
[0021]
Further, the aerial work vehicle 1 is provided with a traveling wheel braking detector 81, a neutral detector 82, a hydraulic pump operating state detector 83, a ground detector 84, a boom retract detector 85, and a second controller 50b. .
[0022]
The traveling wheel braking detector 81 detects whether or not the traveling wheels 11, 11,... Are being braked by a parking brake PB provided in the traveling body 10. The parking lever 73 (see FIG. 1), which is the operation means of the brake PB, is at the parking operation position (operation position where the traveling wheels 11, 11,... Are braked by the parking brake PB) or the parking release operation position (parking). .. Is detected depending on whether the braking of the traveling wheels 11, 11,... Specifically, when the parking lever 73 is located at the parking operation position, the traveling wheel braking detector 81 is turned on when the movable piece is pressed by a part of the parking lever 73 and the parking lever 73 is operated to release the parking. When in the position, the movable piece is constituted by a limit switch that is turned off while being separated from the part of the parking lever 73. When the traveling wheel braking detector 81 is turned on, a voltage signal having a predetermined voltage value is input to the second controller 50b, whereby the second controller 50b indicates that the parking lever 73 is in the parking operation position (ie, traveling). That the wheels 11, 11,... Are in a non-braking state). In the following description, the voltage signal output when the traveling wheel braking detector 81 is on is referred to as a “traveling wheel braking detection signal”.
[0023]
The neutral detector 82 detects whether or not the transmission T that transmits the power of the engine E to the traveling wheels 11, 11,... Is in the neutral position. This detection is performed based on whether or not the shift lever 74 is shifted to the neutral (neutral) position. Specifically, when the shift lever 74 is in the neutral position, the neutral detector 82 is turned on when the movable section is pressed by a part of the shift lever 74, and the shift lever 74 is in a position other than the neutral position. When it is located, the movable section is constituted by a limit switch that is turned off while being separated from the part of the shift lever 74. When the neutral detector 82 is turned on, a voltage signal having a predetermined voltage value is input to the second controller 50b, whereby the second controller 50b is in a state where the shift lever 74 is shifted to the neutral position. Detect that. In the following description, the voltage signal output when the neutral detector 82 is on is referred to as a “neutral detection signal”.
[0024]
The hydraulic pump operating state detector 83 detects whether or not the hydraulic pump P is in an operating state, but directly, whether the PTO operation lever 71 is located at the off position or on. The detection is performed depending on whether the position is present. Specifically, the hydraulic pump operation state detector 83 is turned on when the movable section is pressed by a part of the PTO operation lever 71 when the PTO operation lever 71 is in the on position, and the PTO operation lever 71 is turned on. When the switch is located at the off position, the movable piece is constituted by a limit switch that is turned off by being separated from the part of the PTO operation lever 71. When the hydraulic pump operation state detector 83 is turned on, a voltage signal having a predetermined voltage value is input to the second controller 50b, whereby the second controller 50b has the PTO operation lever 71 located at the on position. (That is, the hydraulic pump P is in an operating state). In the following description, the voltage signal output when the hydraulic pump operating state detector 83 is on is referred to as a “hydraulic pump operating state detection signal”.
[0025]
The ground detector 84 detects whether or not each of the four outrigger jacks 13 is in contact with the ground, and includes a total of four limit switches provided corresponding to the respective outrigger jacks 13. . Each of these limit switches constituting the ground detector 84 has its movable piece pressed by a part of the jack cylinder 13a when the ground plate 13b of the corresponding outrigger jack 13 is in contact with the ground and receives a reaction force from the ground. When the grounding plate 13b is not in contact with the ground and the reaction force from the ground is not acting, the movable piece is separated from the part of the jack cylinder 13a and turned off. When each limit switch is turned on, a voltage signal having a predetermined voltage value is input to the second controller 50b, whereby the second controller 50b has the outrigger jack 13 corresponding to the limit switch in a grounded state. Is detected. In the following description, the voltage signal output when each limit switch constituting the ground detector 84 is on is referred to as a “ground signal”.
[0026]
The boom storage detector 85 detects whether or not the boom 30 is in a predetermined storage posture, and includes a limit switch provided on the upper part of the boom mounting column 14. The boom retract detector 85 is turned on when the boom 30 is in the retracted position and the movable section is pressed by the lower surface of the boom 30, and the boom 30 is raised from the retracted position and the movable section is moved by the lower surface of the boom 30. Turns off when no longer pressed. When the boom retract detector 85 is turned on, a voltage signal having a predetermined voltage value is input to the second controller 50b, whereby the second controller 50b detects that the boom 30 is in a predetermined retracted position. . In the following description, the voltage signal output when the limit switch constituting the boom retract detector 85 is on is referred to as a “boom retract signal”.
[0027]
The second controller 50b is turned on when the engine key switch 80 for starting the engine E is turned on, and turned off when the engine key switch 80 is turned off. Further, when the PTO operation lever 71 is operated from the OFF position to the ON position and the hydraulic pump operation state detection signal is output from the hydraulic pump operation state detector 83, the second controller 50b supplies the power to the first controller 50a. turn on. As a result, the first controller 50a can electromagnetically actuate the first to fifth control valves 51, 52, 53, 54, and 55, and the subsequent overhanging operation of the outrigger jack 13 and the movement operation of the work table 40. Is possible. Further, when the PTO operation lever 71 is operated from the on position to the off position and the hydraulic pump operation state detection signal is no longer output from the hydraulic pump operation state detector 83, the second controller 50b supplies the power to the first controller 50a. Turn off. As a result, the first controller 50a cannot electromagnetically actuate the first to fifth control valves 51, 52, 53, 54, and 55, and the subsequent overhang operation of the outrigger jack 13 and the movement operation of the work table 40 are impossible. It becomes.
[0028]
When performing an aerial work using the aerial work vehicle 1, the worker first performs a traveling operation from the operation cabin 12 to move the aerial work vehicle 1 to the work site. The engine key switch 80 is turned on before the movement to the work site, whereby the engine E is started and the power of the second controller 50b is turned on. When the operator arrives at the work site, the operator performs an operation of positioning the parking lever 73 provided in the driving cabin 12 at the parking operation position. As a result, the parking brake PB (see FIG. 1) provided in the traveling body 10 is actuated to brake the traveling wheels 11, 11,... In addition, the operator shifts the shift lever 74 of the transmission T from a shift position other than the neutral position (for example, a shift position corresponding to a traveling gear such as Low or 2nd) to the neutral position. Thereby, the power transmission from the engine E to the traveling wheels 11, 11,. Subsequently, the PTO operation lever 71 is operated from the off position to the on position. Thereby, a part of the power of the engine E is taken out by the power take-off PTO, and the hydraulic pump P is driven. Further, when the PTO operation lever 71 is operated to the on position, the power supply of the first controller 50b is turned on.
[0029]
Subsequently, the operator operates the jack operation lever 72 provided in the traveling body 10 to project all four outrigger jacks 13. The first controller 50a operates the fifth control valve 55 from the neutral position according to the extension operation of the outrigger jack 13 by the jack operating lever 72, and extends each jack cylinder 13a. When each outrigger jack 13 is in a grounded state, a ground signal is output to the second controller 50b from a limit switch (a limit switch constituting the grounding detector 84) corresponding to the outrigger jack 13. And the 2nd controller 50b returns the 5th control valve 55 of the outrigger jack 13 corresponding to the limit switch which output the ground signal to a neutral position, and stops the expansion | extension operation | movement. Thereby, each outrigger jack 13 will be in the state overhang | projected until the grounding board 13b grounded to the ground, and the traveling body 10 is supported stably.
[0030]
When the four outrigger jacks 13 are extended to the grounded state and the traveling body 10 is stably supported, the operator gets on the work table 40. Then, the operator operates the work table moving operation device 43 to move the work table 40 on which he / she is boarded to a desired position to perform a required work at a high place.
[0031]
When a series of high-altitude work is completed, the operator on the work table 40 operates the work table moving operation device 43 to lower the work table 40 to lower the boom 30 in a predetermined retracted state and get off the work table 40. After all the outrigger jacks 13 are retracted, the PTO operation lever 71 is operated from the on position to the off position (this turns off the power to the first controller 50a), and the power from the engine E to the hydraulic pump P is increased. The transmission is cut off and the hydraulic pump P is deactivated. The operator further enters the driving cabin 12, shifts the shift lever 74 of the transmission T from the neutral position to a shift position other than the neutral position (shift position corresponding to the traveling gear), and sets the parking lever 73 to the parking release operation position. It is operated so as to be positioned, and the braking of the traveling wheels 11, 11,... By the parking brake PB is released (set to a non-braking state). As a result, the traveling body 10 becomes ready to travel. If the engine key switch 80 is turned off after traveling, the operation of the engine E is stopped and the power supply of the second controller 50b is turned off.
[0032]
As described above, according to the aerial work platform 1, the four outrigger jacks 13 can be extended downward from the retracted state and the traveling body 10 can be stabilized, and the high place work can be performed. Since the vehicle 13 can be driven even in the grounded state, the vehicle may be erroneously driven before all the outrigger jacks 13 are set in the retracted state (although it is in the working state). In such a case, the worker on the work table 40 or the worker in the vicinity of the vehicle is put into an unsafe state (for example, the worker on the work table 40 is put in an unstable posture). There is also a possibility that the outrigger jack 13 in an overhanging state may collide with the ground or other structures and be damaged. The aerial work vehicle 1 is provided with a safety device for preventing such a situation, which will be described below.
[0033]
First, a first embodiment of the safety device will be described. The safety device according to the first embodiment includes four detectors (traveling wheel braking detector 81, neutral detector 82, hydraulic pump operating state detector 83) except the boom retract detector 85 among the five detectors described above. In addition to the grounding detector 84), the traveling body 10 and the work table 40 are each provided with an alarm output device 44. Both alarm output devices 44 are electrically connected to the second controller 50b, and are output from four detectors (traveling wheel braking detector 81, neutral detector 82, hydraulic pump operating state detector 83, and ground detector 84). When the output satisfies a predetermined condition, a warning is given to the worker on the ground and the worker on the work table 40 to call attention.
[0034]
Specifically, the hydraulic pump operation state detection signal output from the hydraulic pump operation state detector 83 is not output before the output of the ground signal from all of the four limit switches constituting the ground detector 84 is stopped. Alternatively, when the neutral detection signal output from the neutral detector 82 is no longer output, or when the traveling wheel braking detection signal output from the traveling wheel braking detector 81 is not output, the second controller 50b issues an alarm. The alarm output device 44 issues a warning to the worker based on the warning signal output from the second controller 50b. Here, the alarm output unit 44 is composed of, for example, an alarm buzzer or a panel for displaying the alarm contents by an LED or the like. When the alarm signal is output from the second controller 50b, the alarm output unit 44 is operated by an alarm sound or LED lighting. Give attention to the person.
[0035]
As described above, the safety device according to the first embodiment is in a non-operating state of the hydraulic pump P in a state where it is detected that at least one of the four outrigger jacks 13, 13,... Is detected when any one of detection of a position other than the neutral position of the transmission T and detection of the non-braking state of the traveling wheels 11, 11,... Is detected. It has become. For this reason, since the vehicle has been accidentally driven in spite of being in the working state, the worker (the worker on the work table 40 and the worker in the vicinity of the vehicle) is brought into an unsafe state. Can be prevented. In addition, since the vehicle can be prevented from accidentally moving while the outrigger jack 13 is in the non-retracted state, the unexpected outrigger jack 13 can be prevented from being damaged.
[0036]
In this safety device, since the alarm output device 44 is provided not only in the traveling body 10 but also in the work table 40 as described above, the vehicle travels from the state in which the outrigger jack 13 is not retracted. When this happens, the operator on the work table 40 is also informed of the situation. For this reason, even if the alarm is issued, the worker on the work table 40 is not surprised even when the vehicle travels while the outrigger jack 13 is extended. The posture on the work table 40 is not lost or the posture is not unstable.
[0037]
Next, a second embodiment of the safety device will be described. The safety device according to the second embodiment includes four detectors (running wheel braking detector 81, neutral detector 82, hydraulic pump operating state detector 83) except for the ground storage detector 84 among the five detectors described above. In addition to the boom storage detector 85), the alarm output device 44 is provided. In the second embodiment, when the outputs from these four detectors (traveling wheel braking detector 81, neutral detector 82, hydraulic pump operating state detector 83, and boom retract detector 85) satisfy a predetermined condition. In addition, a warning is given to a worker on the ground and a worker on the work table 40 to call attention.
[0038]
Specifically, the hydraulic pump operation state detection signal output from the hydraulic pump operation state detector 83 is not output before the boom storage signal is output from the limit switch constituting the boom storage detector 85, or When the neutral detection signal output from the neutral detector 82 is not output, or when the traveling wheel braking detection signal output from the traveling wheel braking detector 81 is not output, the second controller 50b outputs an alarm signal. The alarm output device 44 issues an alarm to the worker based on the alarm signal output from the second controller 50b.
[0039]
As described above, the safety device according to the second embodiment detects the non-operating state of the hydraulic pump P and detects the position other than the neutral position of the transmission T before the boom 30 is detected to be in the predetermined retracted position. When any one of the position detection and the detection of the non-braking state of the traveling wheels 11, 11,... Is detected, a warning is given to the operator. For this reason, as in the case of the safety device according to the first embodiment described above, it is possible to prevent the worker from falling into an unsafe state because the vehicle has been accidentally driven in spite of being in a working state. can do. That is, it is possible to reliably prevent a situation in which the worker on the work table 40 loses his / her posture due to the vehicle running away, and the safety of other workers in the vicinity of the vehicle can be achieved.
[0040]
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 detection means (traveling wheel braking detector 81) for detecting whether or not the traveling wheels 11, 11,... Are braked by the parking brake PB is an operation means for the parking brake PB. It was made up of a limit switch that detects whether a certain parking lever 73 is in the parking operation position or the parking release operation position, but is the traveling wheel 11, 11,... Being braked by the parking brake PB? As long as it can detect whether or not, a detecting means having another configuration may be used.
[0041]
Further, in the above-described embodiment, the detecting means (neutral detector 82) for detecting whether or not the transmission T is in the neutral position is in a state where the shift lever 74 of the transmission T is shifted to the neutral position. However, the detection means may have other configurations as long as it can detect whether or not the transmission T is in the neutral position.
[0042]
In the above-described embodiment, the detecting means (hydraulic pump operating state detector 83) for detecting whether or not the hydraulic pump P is in the operating state is configured such that the PTO operation lever 71 is in the off position or the on position. However, a detection means having another configuration may be used as long as it can detect whether or not the hydraulic pump P is in an operating state. .
[0043]
In the above-described embodiment, the alarm given to the worker by the alarm output unit 44 is described as an alarm sound or lighting of an LED or the like. However, these are examples, and the alarm method is not limited to these. Absent.
[0044]
In the above-described embodiment, the aerial work vehicle to which the safety device according to the present invention is applied has a swivel base, a boom, and a work base as a bodywork (a work for a high-altitude work). However, the aerial work vehicle to which the present invention is applied may be a vertical lift type aerial work vehicle that does not have a boom. The aerial work vehicle shown in the above embodiment is an example of a bodywork vehicle to which the safety device according to the present invention is applied, and the application target of the present invention is provided on a traveling body. The mounted object may be a crane vehicle or the like including a crane device.
[0045]
【The invention's effect】
As described above, in the safety device for a work vehicle according to the first aspect of the present invention, the hydraulic pressure is detected in a state where at least one of the plurality of outrigger jacks is in contact with the ground by the ground detection means. Any one of detection of the non-operating state of the hydraulic pump by the pump operating state detecting means, detection of a position other than the neutral position of the transmission by the neutral detecting means, and detection of non-braking of the traveling wheel by the traveling wheel braking detecting means is detected. When the alarm is issued, an alarm is given to the worker via the alarm output means. Therefore, according to the present invention, it is possible to prevent a situation in which an operator is put into an unsafe state because the vehicle has been accidentally driven in spite of being in a working state. Jack damage can also be prevented.
[0046]
In the safety device for a bodywork vehicle according to the second aspect of the present invention, before it is detected that the bodywork for aerial work has a predetermined retracted posture, the hydraulic pressure by the hydraulic pump operating state detecting means is detected. Warning signal output means when any one of detection of non-operating state of the pump, detection of a position other than the neutral position of the transmission by the neutral detection means, and detection of non-braking of the running wheel by the running wheel braking detection means is detected. An alarm is given via. For this reason, as in the case of the safety device according to the first aspect of the present invention, a situation in which the vehicle is accidentally driven in spite of being in a working state, causing the worker to fall into an unsafe state. Can be prevented.
[0047]
Moreover, in the safety device for a bodywork vehicle according to the present invention, when the bodywork is composed of a work table and a moving device that moves the work table, it is preferable that alarm output means is provided on the work table. With such a configuration, when the vehicle is about to be traveled by mistake in spite of being in a working state, the situation on the operator on the work table is also informed. For this reason, even if the vehicle is traveling and moving despite the alarm being issued, the operator on the workbench will not be surprised. It does not become.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a power system transmission train in an aerial work vehicle equipped with a safety device according to an embodiment of the present invention.
FIG. 2 is a perspective view of the aerial work vehicle.
[Explanation of symbols]
1 High-altitude work vehicle (bodywork work vehicle)
10 Running body
11 Traveling wheels
13 Outrigger jack
13a Jack cylinder
20 Revolving body (bodywork, moving device)
23 Swing motor (hydraulic actuator)
24 Rolling cylinder (hydraulic actuator)
30 Bending boom (bodywork, moving device)
33 Telescopic cylinder (hydraulic actuator)
36 bending cylinder (hydraulic actuator)
40 Working table (bodywork)
42 Swing motor
44 Alarm output device (alarm output means)
50b Second controller (alarm signal output means)
71 PTO control lever
72 Jack control lever
73 Parking lever
74 Shift lever
81 Traveling wheel braking detector (traveling wheel braking detection means)
82 Neutral detector (neutral detection means)
83 Hydraulic pump operation state detector (hydraulic pump operation state detection means)
84 Grounding detector (grounding detection means)
85 Boom storage detector (storage detection means)
E engine (motor)
T transmission
PTO power take-off
P Hydraulic pump
PB parking brake

Claims (3)

A traveling body that travels by driving traveling wheels by a prime mover, a bodywork provided on the traveling body, a hydraulic actuator that operates the bodywork, and a hydraulic pump that supplies hydraulic oil to the hydraulic actuator; A safety device for a bodywork vehicle comprising the plurality of outrigger jacks provided in the traveling body and projecting downward from a stored state to stably support the traveling body,
Traveling wheel braking detection means for detecting whether or not the traveling wheel is braked by a parking brake provided in the traveling body;
Neutral detection means for detecting whether or not a transmission for transmitting the power of the prime mover to the traveling wheels is in a neutral position;
Hydraulic pump operating state detecting means for detecting whether or not the hydraulic pump is in an operating state;
A grounding detecting means for detecting whether or not each of the plurality of outrigger jacks is in a state of being grounded to the ground;
In a state where at least one of the plurality of outrigger jacks is in contact with the ground by the ground contact detection means, detection of the non-operating state of the hydraulic pump by the hydraulic pump operation state detection means, neutral detection Warning signal output means for outputting a warning signal when any one of detection of a position other than the neutral position of the transmission by means and detection of non-braking of the running wheel by the running wheel braking detection means is detected. ,
A safety device for a bodywork vehicle, comprising: an alarm output unit that outputs an alarm based on the alarm signal output from the alarm signal output unit. A traveling body that travels by driving a traveling wheel by a prime mover, a bodywork for working at a high place provided on the traveling body, a hydraulic actuator that operates the bodywork, and hydraulic oil to the hydraulic actuator A safety device for a bodywork vehicle configured to include a hydraulic pump to be supplied,
Traveling wheel braking detection means for detecting whether or not the traveling wheel is braked by a parking brake provided in the traveling body;
Neutral detection means for detecting whether or not a transmission for transmitting the power of the prime mover to the traveling wheels is in a neutral position;
Hydraulic pump operating state detecting means for detecting whether or not the hydraulic pump is in an operating state;
Storage detection means for detecting whether the bodywork is in a predetermined storage posture;
Before the storage detecting means detects that the bodywork is in the retracted posture, the hydraulic pump operating state detecting means detects the hydraulic pump inoperative state, and the neutral detecting means detects the transmission of the transmission. An alarm signal output means for outputting an alarm signal when any one of detection of a position other than the neutral position and detection of non-braking of the running wheel by the running wheel braking detection means is detected;
A safety device for a bodywork vehicle, comprising: an alarm output unit that outputs an alarm based on the alarm signal output from the alarm signal output unit. The safety device for a work vehicle according to claim 1 or 2, wherein the bodywork includes a work table and a moving device for moving the work table, and the alarm output means is provided on the work table. .

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