JP2005022786A - Safety device of equipment-mounted working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To operate a mounted object, even when a failure wherein an operation for operating power take-off to transmit power of an engine to a main hydraulic pump is not normally detected is caused. <P>SOLUTION: A controller 50 operates an electric motor M to be a driving source of a hydraulic pump P2 for emergency when performing actuation and operation of the hydraulic pump P2 for emergency in an ON state of power supply. A controller power circuit 60 to be a power circuit of the controller 50 turns on power supply of the controller 50 when performing at least one of an ON operation of a PTO operating lever 71 and the actuation and operation of the hydraulic pump P2 for emergency by a hydraulic pump operation button 74 for emergency. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is designed to make it possible to supply hydraulic oil to the hydraulic actuator even in an emergency when the hydraulic pump that supplies the hydraulic oil to the hydraulic actuator that operates the bodywork provided on the traveling body stops operating. The present invention relates to a safety device for a bodywork vehicle that can achieve the above.
[0002]
[Prior art]
As a bodywork vehicle equipped with a bodywork on a traveling body, an aerial work vehicle, a crane vehicle, and the like are known, and all of them take power take-off (power) of the engine that drives the traveling means (for example, traveling wheels). The hydraulic oil is supplied to a hydraulic actuator that is taken out by a take-out mechanism) and thereby drives the main hydraulic pump to operate the bodywork. Here, when the bodywork work vehicle is an aerial work vehicle, the bodywork corresponds to a work table and its moving device (for example, a swivel base and a telescopic boom). In such a bodywork vehicle, if the main hydraulic pump fails, the hydraulic actuator cannot be operated (for example, a work platform cannot be lowered from a high place if it is a high work vehicle) In addition to the main hydraulic pump, an emergency hydraulic pump driven by an electric motor is provided (see, for example, the following patent document).
[0003]
In such a bodywork vehicle, the operation control of the hydraulic actuator is performed by a controller provided on the traveling body electromagnetically driving a control valve, and the power source of the controller can supply hydraulic oil to the hydraulic actuator. That is, it is turned on only when the engine power is transmitted to the hydraulic pump via the power take-off. This is because when it is not necessary to operate the hydraulic actuator, that is, when the power of the engine is not transmitted to the hydraulic pump, the hydraulic actuator is erroneously operated during road driving by turning off the controller power. This is so that there is no such thing. The emergency hydraulic pump is operated when the main hydraulic pump fails. The controller is configured to drive the electric motor in response to the operation of the emergency hydraulic pump.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-100099
[0005]
[Problems to be solved by the invention]
However, in the safety device configured as described above, the determination as to whether or not the engine power is transmitted to the main hydraulic pump via the power take-off, which is a condition for turning on the controller, is actually Is performed with detection that the operation of operating the power take-off has been performed so that the engine power is transmitted to the main hydraulic pump, and thus the detection is not performed accurately (the detection signal is not output to the controller). When a problem occurs, the controller power is not turned on, and the emergency hydraulic pump cannot be operated.
[0006]
The present invention has been made in view of such a problem, and even if a malfunction occurs in which the operation for operating the power take-off is not normally detected so that the power of the engine is transmitted to the main hydraulic pump. It is an object of the present invention to provide a safety device for a bodywork vehicle capable of operating a clothing.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, a safety device for a bodywork vehicle according to the present invention drives traveling means (for example, traveling wheels 11 in the embodiment) by the power of a prime mover (for example, engine E in the embodiment). Traveling body, a bodywork (for example, the swivel base 20, the telescopic boom 30 and the work table 40 in the embodiment) provided on the traveling body, and a hydraulic actuator (for example, the embodiment) that operates the bodywork Slewing motor 23, hoisting cylinder 24 and telescopic cylinder 31), a first hydraulic pump (for example, main hydraulic pump P1 in the embodiment) for supplying hydraulic oil to the hydraulic actuator, and a power take-out mechanism operating means (for example, the embodiment) Power take-off mechanism for taking out the power of the prime mover and transmitting it to the first hydraulic pump in response to the on operation of the PTO operation lever 71) For example, it is a safety device for a bodywork work vehicle (for example, a track-and-work vehicle 1 in the embodiment) configured to include a power take-off PTO in the embodiment, and is driven by an electric motor to supply hydraulic oil to a hydraulic actuator. A second hydraulic pump to be supplied (for example, an emergency hydraulic pump P2 in the embodiment), a second hydraulic pump operating means for operating the second hydraulic pump (for example, an emergency hydraulic pump operation button 74 in the embodiment), An electric motor operating means (for example, the controller 50 in the embodiment) for operating the electric motor when the second hydraulic pump operating means is operated by the second hydraulic pump operating means in a power-on state; At least one of the ON operation of the operation means and the operation operation of the second hydraulic pump by the second hydraulic pump operation means When is performed, and a motor actuating unit power supply circuit to turn on the electric motor actuating means (e.g., a controller power supply circuit 60 in the embodiment).
[0008]
In such a safety device for a bodywork work vehicle, the power source of the electric motor actuating means for actuating the electric motor that is the drive source of the second hydraulic pump is turned on by the power take-off mechanism operating means (the power take-off mechanism The operation is performed not only when the operation of taking out the power and transmitting it to the first hydraulic pump) but also when the operation of the second hydraulic pump is performed by the second hydraulic pump operating means. Even when the on operation of the mechanism operation means is not normally detected, the second hydraulic pump can be operated. For this reason, it is possible to operate the bodywork even in an emergency where the on-operation of the power take-off mechanism operation means is not detected in addition to the failure of the first hydraulic pump (for example, the bodywork vehicle is an aerial work vehicle If so, the work table located at a high place can be lowered), and the work can be made safe.
[0009]
In the safety device for a bodywork vehicle according to the present invention, the bodywork includes a work table and a moving device that moves the work table (for example, the swivel table 20 and the telescopic boom 30 in the embodiment). Preferably, the second hydraulic pump operating means is provided on a work table. With such a configuration, since the operation of the second hydraulic pump can be performed from the work table, the work table can be lowered in an emergency even when other workers are not on the ground. Is possible.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a railroad work vehicle 1 as a bodywork work vehicle including the safety device according to the first embodiment of the present invention. This track-and-rail work vehicle 1 has traveling wheels (tire wheels) 11, 11,... Driven by an engine E and can be driven from a driver's seat 12. A swivel base 20 provided on the top, a telescopic boom 30 attached to a support column 21 extending upward from the swivel base 20 by a foot pin 22 so as to be swingable up and down, and a telescopic boom 30 attached to a distal end portion. The work table 40 is configured.
[0011]
The swivel base 20 is attached to the rear part of the traveling body 10 so as to be rotatable 360 degrees around a vertical axis. A turning motor (hydraulic motor) 23 is provided inside the traveling body 10, and by rotating the turning motor 23, the turntable 20 can be horizontally turned through a gear (not shown). The telescopic boom 30 is configured such that a plurality of boom members are nested, and by operating the telescopic cylinder (hydraulic cylinder) 31 built in, the boom members are moved relative to each other to expand and contract the entire telescopic boom 30 in the longitudinal direction. Can be moved. Further, a hoisting cylinder (hydraulic cylinder) 24 is straddled between the telescopic boom 30 and the support column 21, and the hoisting cylinder 24 is extended and retracted to cause the entire telescopic boom 30 to move up and down within the upper and lower surfaces. Can do.
[0012]
A lower end portion of a vertical post 33 is attached to a distal end portion of the telescopic boom 30 via a swing pin 32. The vertical post 33 is configured so that a vertical posture is always maintained by a leveling device (not shown) provided in the telescopic boom 30 regardless of the undulation angle of the telescopic boom 30.
[0013]
The work table 40 has a box shape, and is rotatably attached to the upper end portion of the vertical post 33 via a work table holding bracket 41 that protrudes to the outside. A swing motor (electric motor) 42 is provided inside the work table holding bracket 41, and the work table 40 is swung around the vertical post 33 (horizontal) by rotating the swing motor 42. Swivel motion). Here, since the vertical post 33 is always kept in the vertical posture as described above, the floor surface of the work table 40 is always kept horizontal regardless of the undulation angle of the telescopic boom 30.
[0014]
Rail wheels 14 are attached to the traveling body 10 at four locations on the front, rear, left, and right sides (rear of each traveling wheel 11) via iron wheel holding brackets 14a. An iron wheel overhanging storage cylinder (hydraulic cylinder) 14b is provided between the iron wheel holding bracket 14a and the traveling body 10, and the iron wheel holding bracket 14a is rocked in the upper and lower surfaces by the expansion and contraction operation of the iron wheel overhanging storage cylinder 14b. The iron wheel 14 can be extended and stored by being moved.
[0015]
Further, as shown in FIG. 2, a turntable 15 is provided at the lower part of the traveling body 10 so as to protrude downwardly for moving the track-and-rail work vehicle 1 between the road and the track R. The turntable 15 can be extended downward and retracted upward by a telescopic operation of a turntable extension storage cylinder (hydraulic cylinder) 16 incorporated in the traveling body 10. The telescopic operation of the turntable extension storage cylinder 16 and the extension operation of the iron wheel extension storage cylinder 14b described above can be performed by operating levers (not shown) provided in the side operation device 18. is there.
[0016]
In addition, outrigger jacks 17, 17,... Are provided at the front, rear, left, and right portions of the traveling body 10, and the built-in jack cylinder 17a is extended downward to stretch against the ground. The traveling body 10 can be lifted and supported to work in a safer state. A lever for extending and retracting the jack cylinder 17a of each outrigger jack 17 is also provided in the side operation device 18.
[0017]
Further, a PTO operation lever 71 capable of selecting either an on position or an off position is provided in the driver seat 12, and the turning motor 23, the hoisting cylinder 24, the expansion and contraction are provided in the traveling body 10. In addition to the hydraulic pump P1 that supplies hydraulic oil to the cylinder 31, the steel wheel overhanging storage cylinders 14b, 14b,..., The turntable overhanging storage cylinder 16 and the jack cylinders 17a, 17a,. There is provided a power take-off (power take-off mechanism) PTO that performs an operation of taking out the power of the engine E and transmitting it to the main hydraulic pump P1 when an operation to turn from the off position to the on position (on operation) is performed. (See FIG. 1).
[0018]
The hydraulic oil discharged from the main hydraulic pump P1 is supplied to the swing motor 23 via the first control valve 51, supplied to the hoisting cylinder 24 via the second control valve 52, and supplied to the telescopic cylinder 31 via the third control valve 53. Supplied. For this reason, the hydraulic actuators (the swing motor 23, the hoisting cylinder 24, and the telescopic cylinder 31) that actuate the swivel base 20 and the telescopic boom 30 that are the moving devices of the work table 40 are respectively connected to the corresponding control valves 51, 52, and 53. It operates at a direction and speed according to the driving state of a spool (not shown). A controller 50 that controls the operation of the first to third control valves 51, 52, 53 is installed in the traveling body 10, and the controller 50 operates a worktable moving operation device 43 provided on the worktable 40. The spools of the first to third control valves 51, 52, and 53 are driven based on the operation signal output by. Further, the swing motor 42 that swings the work table 40 is operated without the controller 50 by the operation of the work table moving operation device 43.
[0019]
Further, the hydraulic oil discharged from the main hydraulic pump P1 is supplied to the iron wheel extension storage cylinder 14b via the fourth control valve 54, and is supplied to the turntable extension storage cylinder 16 via the fifth control valve 55. 6 is supplied to the jack cylinder 17a via the control valve 56. In FIG. 1, one fifth control valve 55 and one iron ring overhanging storage cylinder 14b are shown, but in actuality, the number of the fifth control valve 55 and iron ring overhanging storage cylinder 14b is equal to the number of iron rings 14. (Four) are provided. In addition, one sixth control valve 56 and one jack cylinder 17a are also shown, but in actuality, as many sixth control valves 56 and jack cylinders 17a as the outrigger jacks 17 are provided. .
[0020]
The controller 50 is turned on and off via the controller power supply circuit 60. As shown in FIG. 1, the controller power supply circuit 60 includes a battery 61, an engine key switch 62, a PTO operation detection switch 63, a relay 64 including an electromagnetic solenoid 64a and a movable piece 64b, and an emergency hydraulic pump operation detection switch 65. When the PTO operation lever 71 is turned on (operated from the off position to the on position) with the engine E operating, the PTO operation detector 73 detects that the PTO operation lever 71 is turned on. The controller 50 is turned on.
[0021]
More specifically, first, when the engine key 72 that starts the operation of the engine E provided in the driver's seat 12 is operated in the operation start direction of the engine E, the engine key switch 62 is turned on. Further, when the PTO operation lever 71 is turned on (operated from the off position to the on position) and the PTO operation detector 73 detects this, the PTO operation detection switch 63 is turned on. As a result, the electromagnetic solenoid 64a is connected to the battery 61 and excited, and the movable piece 64b operates in the ON direction, so that the controller 50 is connected to the battery 61 and the power is turned on. On the other hand, even if the engine key 72 is operated in the operation start direction of the engine E and the engine key switch 62 is turned on, the controller 50 does not turn on the PTO operation lever 71 (if it remains in the off position). Will not turn on. Thus, even if the work table moving operation device 43 is operated with the power of the controller 50 turned off, the first to third control valves 51, 52, 53 are not operated. Even when the table moving operation device 43 is moved, the hydraulic actuator does not start to move.
[0022]
Since the track-and-rail work vehicle 1 has such a configuration, an operator who is going to perform work at the work site first operates the PTO operation lever 71 in the operating state of the engine E. As a result, the main hydraulic pump P1 is rotated by receiving the power of the engine E taken out by the power take-off PTO, and the power of the controller 50 is also turned on. Then, the main hydraulic pump P1 gets into the work table 40 and operates the work table moving operation device 43. If this is done, the swivel base 20 can be swung, the telescopic boom 30 can be raised and lowered, or the work table 40 can be swung, and the work table 40 on which it is mounted is moved to a desired position and posture. It is possible.
[0023]
Next, a procedure for performing an altitude work on the track R, for example, a maintenance inspection work on the trolley wire, using the track-and-work vehicle 1 will be described. In order to perform such a high-altitude work, first, an operator performs a road driving operation from the driver's seat 12 and moves the track-and-rail work vehicle 1 to a railroad crossing nearest to the work site. Here, when moving on the road, the iron wheel 14 is kept in the upper storage position (see the iron wheel 14 indicated by a two-dot chain line in FIG. 2). In addition, the telescopic boom 30 is laid down forward in a fully contracted state and placed in a retracted state placed on a boom receiver 19 provided in front of the traveling body 10.
[0024]
When arriving at the railroad crossing nearest to the work site, the track-and-rail work vehicle 1 is stopped by crossing the railroad crossing with the front and rear traveling wheels 11, 11 and operated from the side operation device 18 to extend the turntable extension storage cylinder 16. Operate. Thereby, the turntable 15 protrudes below the traveling body 10, and this track-and-rail work vehicle 1 will be in the state where it was lifted and supported. When the traveling body 10 is lifted and supported by the turntable 15, the rear part (or front part) of the traveling body 10 is pushed to the side of the traveling body 10 to turn about 90 degrees. As a result, when the front-rear direction of the traveling body 10 coincides with the direction in which the track R extends, an operation is performed from the side operation device 18 to extend the iron wheel overhanging storage cylinder 14b. Thus, when each iron wheel 14 is extended to a predetermined overhang position, the turntable overhanging storage cylinder 16 is contracted to place the iron wheel 14 on the track R while the turntable 15 is stored. When the turntable 15 is completely stored, the track-and-rail work vehicle 1 is transferred from the road onto the track R.
[0025]
When the main track-and-work vehicle 1 is transferred onto the track R in this way, the operator performs a driving operation from the driver's seat 12 and is supported by the four iron wheels 14, 14,. , 11,... When the worker arrives at the work site, the operator gets on the work table 40 from the traveling body 10 and operates the work table moving operation device 43 to move the telescopic boom 30 up and down, extend and retract, or swing the work table 40. Then, the work table 40 is moved to perform a required work (in this case, a trolley wire inspection work). During this operation, the outrigger jacks 17, 17,... Can be extended to increase the stability of the traveling body 10. Then, when the work is completed, the work table moving operation device 43 is operated to place the telescopic boom 30 in the retracted state, and the traveling operation is performed from the driver's seat 12 to the point where the crossing is present.
[0026]
When the railroad crossing vehicle 1 is moved to a point where the railroad crossing is reached, the work vehicle 1 is stopped on the track R and operated from the side operation device 18 to extend the turntable extension storage cylinder 16 to extend the turntable 15 downward. Let When the traveling body 10 is lifted and supported by the turntable 15, the rear part (or front part) of the traveling body 10 is pushed to the side of the traveling body 10 to turn about 90 degrees, whereby the longitudinal direction of the traveling body 10 is the direction in which the road extends. If it substantially matches, the iron ring overhanging storage cylinder 14b is contracted. As a result, when each iron wheel 14 is stored in a predetermined storage position, the turntable overhanging storage cylinder 16 is stored and all the traveling wheels 11, 11,... Are grounded on the road. When the turntable 15 is completely stored, the track-and-rail work vehicle 1 is transferred from the track R onto the road, and the series of operations ends.
[0027]
Next, the configuration of the safety device provided in the track-and-rail work vehicle 1 will be described. In addition to the controller 50 and its power supply circuit (controller power supply circuit 60), this safety device is driven by an electric motor M to supply hydraulic oil to the hydraulic actuators (the turning motor 23, the undulating cylinder 24 and the telescopic cylinder 31). And an emergency hydraulic pump operation button 74 for operating the emergency hydraulic pump P2. Here, the controller power supply circuit 60 turns on the PTO operation lever 71 (operation to take out the power of the engine E by the power take-off PTO and transmit it to the main hydraulic pump P1) and the emergency hydraulic pressure by the emergency hydraulic pump operation button 74. When at least one of the operation operations of the pump is performed, the controller 50 is turned on. That is, the controller power supply circuit 60 is configured such that when the emergency hydraulic pump P2 is operated by the emergency hydraulic pump operation button 74 while the engine E is operating, the PTO operation lever 71 is not turned on. Even (including the case where the operation is not detected due to a failure of the PTO operation detector 73 or the PTO operation detection switch 63 even though the PTO operation lever 71 is turned on) Works to turn on.
[0028]
The operation of the controller power supply circuit 60 will be specifically described. As described above, when the engine key 72 provided in the driver's seat 12 and starting the operation of the engine E is operated in the operation start direction of the engine E, the engine key switch 62 is turned on. When the operation of the emergency hydraulic pump P2 by the button 74 is performed, the emergency hydraulic pump operation detection switch 65 is turned on. As a result, the electromagnetic solenoid 64a is connected to the battery 61 and excited, and the movable piece 64b operates in the ON direction, so that the controller 50 is connected to the battery 61 and the power is turned on. In the state where the power supply is turned on, the controller 50 operates the emergency hydraulic pump P2 which is output via the signal transmission line L when the emergency hydraulic pump operation detection switch 65 is turned on ( When the voltage signal of the battery 61 is input, the electric motor M is operated. As a result, the emergency hydraulic pump P2 is activated.
[0029]
The controller 50 activates the electric motor M when the controller power supply circuit 60 turns on the power and when the operation operation signal for the emergency hydraulic pump P2 is input from the signal transmission line L. Therefore, the on-operation of the PTO operation lever 71 is normally detected and the PTO operation detection switch 63 is turned on. As a result, the emergency hydraulic pump operation button 74 is operated from the state where the power of the controller 50 is on. Of course, when the operation signal of the emergency hydraulic pump P2 is input from the signal transmission line L, the electric motor M is operated.
[0030]
According to the safety device for a bodywork vehicle having the above-described configuration, the power source of the controller 50 that operates the electric motor M that is the drive source of the emergency hydraulic pump P2 is turned on by the PTO operation lever 71 (power take-off PTO It is turned on not only when the operation of taking out the power of E and transmitting it to the main hydraulic pump P1) but also when the emergency hydraulic pump P2 is operated by the emergency hydraulic pump operation button 74. Therefore, the emergency hydraulic pump P2 can be operated even when the ON operation of the PTO operation lever 71 is not normally detected (for example, when the PTO operation detector 73 fails). For this reason, in addition to the failure of the main hydraulic pump P1, the work table 40 can be lowered even in an emergency or the like in which an on operation of the power take-off PTO is not detected, and work safety can be ensured.
[0031]
In the above embodiment, the emergency hydraulic pump operation button 74 is preferably provided on the work table 40 in addition to the traveling body 10. With such a configuration, the operation of the emergency hydraulic pump P2 can be performed from the work table 40, so that even when no other worker is on the ground, the work table 40 in an emergency can be operated. It is possible to reliably descend.
[0032]
FIG. 3 shows a signal and power transmission path related to the movement of the work table in the track work vehicle equipped with the safety device according to the second embodiment of the present invention. In FIG. 3, components having the same reference numerals as those of the safety device according to the first embodiment described above are the same components as those of the safety device according to the first embodiment, and description thereof will be omitted.
[0033]
In the safety device according to the second embodiment, in the railroad work vehicle 1 shown in FIG. 2, a part of a remarkable boom member constituting the telescopic boom 30 (for example, the boom member located at the most distal end side) is FRP (fiberglass). This is employed when the material is made of an electrically insulating material such as reinforced plastics (reinforced plastic). Since the traveling body 10 and the work table 40 are electrically insulated in the track-and-rail work vehicle having such a configuration, the traveling body 10 side includes the lower controller 150a and the work table 40 side includes the upper controller 150b. All or part of the signal transmission line 150c (both electrically insulated in the telescopic boom 30) connecting these controllers 150a and 150b is made of a non-conductive member such as an optical fiber.
[0034]
The controller power supply circuit 160 corresponding to the controller power supply circuit 60 in the first embodiment described above is connected to the lower controller 150a, and the PTO operation lever 71 is turned on and the emergency hydraulic pump operation button (in the first embodiment described above). At least one of the operation operations of the emergency hydraulic pump P2 by the lower emergency hydraulic pump operation button 174a corresponding to the emergency hydraulic pump operation button 74 and the upper emergency hydraulic pump operation button 174b provided on the work table 40) Is performed, the lower controller 150a is turned on.
[0035]
The specific operation of the controller power supply circuit 160 is as follows. The engine key 72 is operated in the operation start direction of the engine E, the engine key switch 62 is turned on, and then the operation of the emergency hydraulic pump P2 by the lower emergency hydraulic pump operation button 174 is performed. When the operation is performed, the emergency hydraulic pump operation detection switch 65 is turned on, and the electromagnetic solenoid 64a is thereby excited to move the movable section 64b in the on direction, and the controller 50 is turned on. This is the same as that of the controller power supply circuit 60 according to the first embodiment. However, in the controller power supply circuit 160 of the safety device according to the second embodiment, when the engine key switch 62 is turned on, the on signal is inputted to the lower controller 150a via the signal transmission line L1, and such an engine is turned on. The lower controller 150a to which the ON signal of the key switch 62 is input is in a standby state in which communication with the upper controller 150b is performed via the signal transmission line 150c (a state where the power is off but communication with the upper controller 150b is possible). )to go into.
[0036]
Here, when the upper controller power button 175 provided on the work table 40 is operated, the upper controller power switch 167 is turned on, the voltage of the upper battery 166 is supplied to the upper controller 150, and the upper controller 150 is powered. Turn on. If the lower controller 150a is in the standby state as described above, the upper controller 150b can communicate with the lower controller 50b via the signal transmission line 150c. From this state, when the upper emergency hydraulic pump operation button 174b provided on the work table 40 is further operated, the upper emergency hydraulic pump operation detection switch 168 is turned on. An operation signal of the emergency hydraulic pump operation button 174b is input to the upper controller 150b, and the upper controller 150b transfers this operation signal to the lower controller 150a. The lower controller 150a receives the operation signal of the upper emergency hydraulic pump operation button 174b transferred from the upper controller 150b and outputs a voltage to the signal transmission line L2, thereby exciting the electromagnetic solenoid 64a to move the movable piece 64b. Is operated in the on direction to connect the lower controller 150a to the battery 61 and turn on the power of the lower controller 150a. In this manner, when the power of the lower controller 150a is turned on, the operation signal of the emergency hydraulic pump operation button 174b is already input, so the lower controller 150a operates the electric motor M, thereby The hydraulic pump P2 is driven and the hydraulic actuator can be operated.
[0037]
Even in the safety device having such a configuration, the power source of the controller 50 that operates the electric motor M that is the drive source of the emergency hydraulic pump P2 is not only the ON operation of the PTO operation lever 71 but also the emergency device. It is turned on when the emergency hydraulic pump P2 is operated by the hydraulic pump operation button (the lower emergency hydraulic pump operation button 174a or the upper emergency hydraulic pump operation button 174b). Therefore, the same effect as that of the safety device according to the first embodiment described above can be obtained. However, in the safety device according to the second embodiment, in particular, an electrically insulating portion is provided between the traveling body 10 and the work table 40. Is characteristic in that it has a configuration capable of operating the emergency hydraulic pump P2.
[0038]
In the normal case where the emergency hydraulic pump P2 is not used as described above, the lower controller 150a is powered on by operating the PTO operation lever 71 after the engine key 72 is operated. In addition, when the operator OP on the work table 40 operates the upper controller power button 175, the power of the upper controller 150b is also turned on. In this state, the power of both the controllers 150a and 150b is turned on. The operation signal output by operating the work table moving operation device 43 provided on the work table 40 is input to the lower controller 150a through the signal transmission line 150c. Then, since the power supply of the lower controller 150a is already turned on, the operation control of the control valves 51, 52,... Is performed, and the hydraulic actuator is operated according to the operation of the work table moving operation device 43.
[0039]
In addition, as shown in the first and second embodiments described above, the safety device according to the present invention can operate the emergency hydraulic pump operation button 74 (first operation) even when the PTO operation lever 71 is not turned on. In the second embodiment, the controller 50 (the lower controller 150a in the second embodiment) is operated by operating the emergency hydraulic pump P2 by the lower emergency hydraulic pump operation button 174a or the upper emergency hydraulic pump operation button 174b). The power of the engine E can be turned on, and the PTO operation lever 71 remains in the first position (that is, the power of the engine E is transmitted to the traveling wheels 11, 11,... The emergency hydraulic pump P2 can be operated by operating the emergency hydraulic pump operation button 74, so that the traveling body 10 can run. It is also possible to perform the storage operation of the overhang operation or railway turntable 15 remains iron ring 14 was ready. As a result, when changing the above-mentioned track-and-rail work vehicle 1 from the road onto the track R, the iron wheel 14 is slowly extended while moving the vehicle back and forth on the track R (but at a very low speed). It is also possible to ensure that it is placed on the track R.
[0040]
Although the embodiment of the safety device for a bodywork vehicle according to the present invention has been described so far, the scope of the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the case where the object to which the safety device for a bodywork vehicle according to the present invention is applied is a track-and-rail work vehicle including an iron wheel for track traveling. Is merely an example, and the present invention can also be applied to an aerial work vehicle that does not include an iron wheel and travels exclusively with tire wheels. In the above-described embodiment, an example in which the bodywork work vehicle travels using traveling wheels (tire wheels) has been described. However, the traveling means of the bodywork work vehicle is not limited to such traveling wheels, and a crawler device or the like. It does not matter. Further, the prime mover for driving the traveling means may be an electric motor or the like in addition to the engine. Furthermore, other bodywork vehicles constructed by mounting work devices other than the swivel base, boom, and work table on the traveling body, for example, a hopper that is a compression loading mechanism on the traveling body, a waste discharging mechanism, and the like. The present invention can also be applied to a garbage truck or the like that is provided.
[0041]
【The invention's effect】
As described above, in the safety device for a bodywork vehicle according to the present invention, the power source of the electric motor operating means that operates the electric motor that is the drive source of the second hydraulic pump is used, and the power of the prime mover is the first hydraulic pump. In addition to the fact that the power take-off mechanism operation means is turned on so that the power of the prime mover is taken out by the power take-off mechanism and transmitted to the first hydraulic pump so as to be transmitted to Since the second hydraulic pump is turned on also when the second hydraulic pump is operated by the hydraulic pump operating means, the second hydraulic pump is operated even when the on-operation of the power take-off mechanism is not normally detected. Can do. For this reason, it is possible to operate the bodywork even in an emergency where the on-off operation of the power take-off mechanism is not detected in addition to the failure of the first hydraulic pump (for example, the bodywork vehicle is an aerial work vehicle). For example, the work table located at a high place can be lowered), and the work can be made safe.
[0042]
Further, when the bodywork is composed of a work table and a moving device for moving the work table, the second hydraulic pump operating means is preferably provided on the work table. For example, since the operation of the second hydraulic pump can be performed from the work table, the work table can be reliably lowered in an emergency even when there is no other worker on the ground.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a block diagram showing a transmission path of signals and power related to movement of a work platform in a track work vehicle equipped with a safety device according to a first embodiment of the present invention.
FIG. 2 is a side view of the track-and-rail work vehicle.
FIG. 3 is a block diagram illustrating a transmission path of signals and power related to movement of a work platform in an orbital work vehicle including a safety device according to a second embodiment of the present invention.
[Explanation of symbols]
1 Railroad work vehicle (bodywork vehicle)
10 Running body
11 Traveling wheels (traveling means)
20 swivel (framework)
23 Swing motor (hydraulic actuator)
24 Rolling cylinder (hydraulic actuator)
30 Telescopic boom (bodywork)
31 Telescopic cylinder (hydraulic actuator)
40 Working table (bodywork)
42 Swing motor
43 Work table moving operation device
50 controller (electric motor actuating means)
60 Controller power supply circuit (electric motor operating means power supply circuit)
62 Engine key switch
63 PTO operation detection switch
64a electromagnetic solenoid
64b Movable section
71 PTO operation lever (power take-off mechanism operation means)
72 Engine key
73 PTO operation detector
74 Emergency hydraulic pump operation button (second hydraulic pump operation means)
E engine (motor)
PTO power take-off (power take-off mechanism)
P1 Main hydraulic pump (first hydraulic pump)
P2 Emergency hydraulic pump (second hydraulic pump)
M Electric motor

Claims (2)

A traveling body that travels by driving traveling means with the power of a prime mover, a bodywork provided on the traveling body, a hydraulic actuator that operates the bodywork, and a hydraulic oil that supplies hydraulic oil to the hydraulic actuator 1. A safety device for a bodywork vehicle comprising: 1 hydraulic pump; and a power take-out mechanism that takes out the power of the prime mover in response to an on operation of a power take-out mechanism operation means and transmits the power to the first hydraulic pump. ,
A second hydraulic pump driven by an electric motor to supply hydraulic oil to the hydraulic actuator;
Second hydraulic pump operating means for operating the second hydraulic pump;
Electric motor operating means for operating the electric motor when the second hydraulic pump operating means is operated by the second hydraulic pump operating means in a power-on state;
An electric motor that turns on the power supply of the electric motor actuating means when at least one of an on operation of the power take-off mechanism operating means and an operation of the second hydraulic pump by the second hydraulic pump operating means is performed A safety device for a bodywork vehicle comprising an operating means power circuit. 2. The bodywork vehicle according to claim 1, wherein the bodywork includes a work table and a moving device that moves the work table, and the second hydraulic pump operation unit is provided on the work table. Safety device.

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