JP4542925B2 - Door locking device for work vehicle - Google Patents

Description

  The present invention relates to a door locking device for a working vehicle, and more particularly to a door locking device capable of locking and unlocking a door attached to a driving cabin from a working device mounted on the working vehicle. .

  In a working vehicle such as an aerial work vehicle (a so-called “truck mounted aerial work vehicle”) equipped with a work device for high places based on a truck vehicle, the power for driving the work device is, for example, a truck vehicle It is taken out from a power take-off (PTO) device mounted on the engine. For this reason, the work device is configured so that it cannot be operated unless the chassis key switch (ignition key) of the truck vehicle is turned on (see, for example, Patent Document 1).

JP 2002-46997 A

  However, when using the work equipment, the chassis key switch is turned on, that is, the key is still inserted into the chassis key cylinder in the driving cabin. The door for boarding remains unlocked. Therefore, in such a state, a third party can freely enter and exit the driving cabin, and when the chassis key switch is turned off, the work device may stop at a timing unintended by the operator. In addition, there is a problem that the in-vehicle product in the driving cabin may be stolen. In particular, when an operator rides on a work table provided on a work device of an aerial work vehicle to perform work at a high place, it is difficult to monitor the truck vehicle side (driving cabin) from the work table. .

  This invention is made | formed in view of such a subject, and it aims at providing the door locking apparatus of the working vehicle which can perform the locking operation of a truck vehicle from a working apparatus.

  In order to solve the above-mentioned problems, a door locking device for a working vehicle according to the present invention is a vehicle body provided with a driving cabin having a door attached so as to freely open and close the entrance and a locking portion for locking the door. It is used for a work vehicle (for example, an aerial work vehicle 1 in the embodiment) configured by disposing a work device (for example, the aerial work apparatus 8 in the embodiment). A locking operation switch for performing an operation for locking or unlocking the locking portion, and a locking driving portion for locking or unlocking the door by driving the locking portion and driving the locking portion. The operation of the locking drive unit is controlled according to the operation of the locking operation switch.

  At this time, a chassis key switch that is disposed in the operation cabin and that turns on / off the power of the work device, and a power-on means for turning on / off the work device when the chassis key switch is on (for example, The working device power switch 26) in the embodiment is configured such that when the power-on means is turned on, the operation of the locking drive unit is controlled in accordance with the operation of the locking operation switch. preferable.

  In addition, it is detected that the working device is in the working state by the working state detecting means (for example, the boom storage detector 23 in the embodiment) for detecting whether or not the working device is in the working state. Sometimes, it is preferable to have a controller that controls the locking drive unit and locks the door by the locking unit.

  Alternatively, when it is detected by the storage state detection means (for example, the boom storage detector 23 in the embodiment) that detects whether or not the work device is in the storage state and the storage state detection means, the work device is in the storage state. In addition, it is preferable to have a controller that controls the locking drive unit and unlocks the door by the locking unit.

  If the door locking device of the working vehicle according to the present invention is configured as described above, the door of the driving cabin can be locked by an operation from the working device, so that the third in the driving cabin during the operation of the working device. It is possible to prevent a person from entering the vehicle, and it is possible to prevent the in-vehicle product in the driving cabin from being stolen.

  In addition, when the chassis key switch provided on the vehicle body is turned on, the controller is turned on so that the door can be locked from the work device side.・ The key switch can be prevented from being operated by a third party.

  Furthermore, by detecting that the working device is in the working state and locking the door, and detecting that the working device is in the retracted state and unlocking the door, forgetting to lock the door when operating the working device This can be prevented.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, an aerial work vehicle 1 in which an aerial work device is mounted on a vehicle body will be described with reference to FIG. 1 as an example of a work vehicle on which a door locking device according to the present invention is mounted. The aerial work vehicle 1 has a driving cabin 2a in front of a vehicle body 2 and is configured based on a truck vehicle that can travel on front and rear wheels 3a and 3b. A swivel 4 that is driven by a swivel motor and configured to be capable of swiveling is attached to the vehicle body 2 behind the driving cabin 2a. A base 5 is pivotally connected to the upper part of the swivel 4 and a boom 5 is attached so as to be able to move up and down in a vertical plane by an expansion and contraction operation of the hoisting cylinder. The boom 5 is configured such that a plurality of members are combined in a nested manner and can be expanded and contracted by a built-in telescopic cylinder.

  A vertical post (not shown) is pivotally connected to the tip of the boom 5 so as to be able to swing in the same plane (in the vertical plane) as the hoisting operation surface of the boom 5. Regardless of the undulation angle of 5, the leveling control is performed so that it always extends vertically. A work table 7 is attached to the vertical post thus held vertically so as to be able to turn horizontally by a swing motor, and the floor surface of the work table 7 is always kept horizontal regardless of the undulation state of the boom 5. Is done. In the following description, the swivel base 4, the boom 5, and the work table 7 are collectively referred to as “aerial work device 8”. An upper operation device 9 is attached to the work table 7, and an operator who has boarded the work table 7 operates the upper operation device 9 to operate the aerial work device 8.

  Outrigger jacks 10 a and 10 b that are extendable downward are provided at four locations on the vehicle body 2 in the front, rear, left, and right directions. When working at a high place by operating the high place work device 8, the operator lifts the left and right outrigger jacks 10a, 10b downward according to the relative positional relationship with surrounding obstacles and lifts the vehicle body 2 To support. The outrigger jacks 10 a and 10 b are operated by a jack operating device provided on the vehicle body 2.

  The aerial work vehicle 1 drives the locking portion 11 of the door 2b attached to the driving cabin 2a by, for example, a locking switch provided on the driver's seat side in the driving cabin 2a to lock the door 2b. Or it is comprised so that unlocking is possible.

  Now, the door locking device 20 used in the aerial work vehicle 1 configured as described above will be described with reference to FIG. The door locking device 20 includes a controller 30, a locking operation switch 22, a boom storage detector 23, a locking drive unit 24, and a locking state display unit 25.

  The controller 30 is connected to a chassis / key switch 21 provided in the operation cabin 2a. When the chassis / key switch 21 is turned on, the controller 30 is turned on and started. ing. The controller 30 is connected to the upper operation device 9 described above, and the controller 30 receives an operation signal output from the upper operation device 9 and outputs a control signal for controlling the operation of the aerial work device 9. The hydraulic oil 40 is output to control hydraulic oil supply to an actuator 50 (for example, the above-described turning motor, hoisting cylinder, telescopic cylinder, etc.) that drives the aerial work device 9. Here, the hydraulic unit 40 includes a hydraulic pump 41, an oil tank 42, a control valve 43 that controls the actuator 50, and the like. The hydraulic oil sucked up and discharged by the hydraulic pump 41 from the oil tank 42 is discharged by the control valve 43. The actuator 50 is configured to control supply. The hydraulic pump 41 is driven by taking power from the PTO device 13 attached to the engine 12 that causes the vehicle body 2 to travel.

  The locking operation switch 22 is attached to the work table 7, and an operation signal is output to the controller 30 when operated by an operator who has boarded the work table 7. The locking drive unit 24 drives the locking unit 11 attached to the door 2b of the driving cabin 2a. The locking drive unit 24 operates based on a control signal from the controller 30 and drives the locking unit 11 to drive the door. Lock and unlock 2b. Furthermore, the lock state display part 25 is attached to the work table 7, and the state (locked state or unlocked state) of the above-described lock part 11 is displayed.

  In the door locking device 20 configured as described above, an operator who has boarded the work table 7 operates the lock operation switch 22 to perform the operation of locking and unlocking the door 2b of the operation cabin 2a from the work table 7. be able to. Therefore, when working at a high place by the high place working device 8, the door 2b is locked from the work table 7 even when the key is still inserted into the chassis key switch 21 in the operation cabin 2a. It is possible to prevent three persons from operating this key.

  By the way, if it is configured to operate the locking / unlocking of the door 2b from the locking operation switch 22 provided on the workbench 7, the operator forgets to lock the door 2b and starts the work by the height working device 8. May end up. Therefore, in the door locking device 20 according to the present embodiment, it is detected whether the aerial work device 9 of the aerial work vehicle 1 is in the working state or in the retracted state, and the door 2b is automatically locked / unlocked. Configured to do. That is, the boom retract detector 23 connected to the controller 30 detects whether or not the boom 5 is in the retracted state. When the boom 5 is not in the retracted state, it is determined that the aerial work device 9 is being operated. It is configured as follows. In the boom storage detector 23, for example, a limit switch is provided in a boom receiver (not shown), and when the boom 5 is stored in the boom receiver, the limit switch is turned on and the boom 5 is stored in the boom receiver. It is configured to be turned off when not.

  Specifically, the controller 30 performs the following control. When an operator gets on the work table 7 and operates the upper working device 9 by operating the upper operating device 9, a signal that the boom 5 is activated and the boom 5 is not stored is received from the boom storage detector 23. It is output to the controller 30. Then, the controller 30 determines that the aerial work device 8 is in a working state, outputs a control signal to the locking drive unit 24 to lock the door 2b of the operation cabin 2a, and is locked to the locking state display unit 25. Is displayed.

  On the other hand, when the high place work by the high place work device 8 is finished and the boom 5 is stored in the boom receiver, a signal indicating that the boom 5 is stored is output from the boom storage detector 23 to the controller 30. Then, the controller 30 determines that the aerial work device 8 is in the retracted state, outputs a control signal to the locking drive unit 24 to unlock the door 2b of the operation cabin 2a, and unlocks the locking state display unit 25. Is displayed.

  Thus, by automatically performing the locking / unlocking of the door 2b by the controller 30 in accordance with the state of the aerial work device 8, it is possible to prevent the operator from forgetting to lock the door 2b. At this time, the locked state display unit 25 can confirm the locked state of the door 2b from the work table 7.

  The means for detecting whether the aerial work device 8 is in the retracted state or the working state (hereinafter referred to as “state”) is not limited to the boom retracting detector 23. For example, outrigger jacks 10a and 10b (hereinafter collectively referred to as “outrigger jacks 10”) are provided with jack ground detectors for detecting that the outrigger jacks 10 are extended downward and grounded, and the signals are sent to the controller 30. The state of the aerial work device 8 can be determined. Moreover, the state of the aerial work device 8 can also be determined by providing a jack storage detector including a limit switch that detects a state in which the outrigger jack 10 is fully contracted, and inputting this signal to the controller 30. Then, it is possible to determine the state of the aerial work device 8 by detecting that a jack operating device (provided on the vehicle body 2) for operating expansion / contraction of the outrigger jack 10 is operated. Similarly, it is possible to detect the state of the aerial work device 8 by providing a work table storage detector including a limit switch for detecting that the work table 7 is stored at a predetermined position of the vehicle body 2. Alternatively, a boom hoisting angle detector for detecting the hoisting angle of the boom 5 is provided, and when the hoisting angle becomes equal to or larger than a predetermined size, it is determined that the aerial work device 8 is in a working state. You can also.

  Further, in the above embodiment, the case where the locking operation switch 22 is provided on the workbench 7 has been described. However, the locking operation switch 22 is provided on the vehicle body 2 (for example, provided on the vehicle body 2 to operate the boom 5 and the like). It is also possible to provide in the vicinity of the lower operation device to be performed and the jack operation device to operate the outrigger jack 10. In this case, when the controller 30 determines that the aerial work device 8 is in the working state by the boom storage detector 23 or the like, the unlocking operation of the locking unit 11 by the operation of the locking operation switch 22 is restricted. And it is preferable to comprise so that the locking part 11 may not be in an unlocked state. The locking part 11 of the door 2b is unlocked during high-altitude work, and a third party enters the driving cabin 2a and the chassis key switch 21 is turned off, or the in-vehicle product in the driving cabin 2a is stolen. This is to prevent this.

  In the above embodiment, the case where the controller 30 is configured to be turned on in conjunction with the chassis key switch 21 has been described. However, the present invention is not limited to this. In addition to turning on the chassis key switch 21, for example, the controller 30 may be turned on in conjunction with a switch for operating the PTO device 13, or to operate the aerial work device 8. The controller 30 may be turned on in conjunction with the work device power switch 26 that turns on the power, so that the locking unit 11 can be locked and unlocked from the locking operation switch 22. Further, in the above embodiment, the door 2b is automatically locked / unlocked according to the state of the work place 8 at a high place, but the door 2b is not locked instead of such control. It is also possible to configure the controller 30 to give a warning (e.g., an alarm sound) to the worker when the high place working device 8 is in a working state.

  The door 2 b is not automatically locked / unlocked by the controller 30, but is configured to directly lock / unlock the locking portion 11 in accordance with the operation of the locking operation switch 22 provided on the work table 7. In this case, the locking drive unit 24 may be operated directly from the locking operation switch 22.

It is a perspective view which shows the structure of the aerial work vehicle where the door locking device which concerns on this invention is mounted. It is a block diagram which shows the structure of the door locking device which concerns on this invention.

Explanation of symbols

1 Aerial work vehicle (work vehicle)
2 Car body 2a Driving cabin 2b Door 8 Altitude working device (working device)
DESCRIPTION OF SYMBOLS 11 Locking part 20 Door locking device 21 Chassis key switch 22 Locking operation switch 23 Boom storage detector (working state detection means, storage state detection means)
24 Locking drive part 26 Working device power switch (power-on means)
30 controller

Claims (4)

A door locking device for a working vehicle, in which a working device is disposed on a vehicle body provided with a driving cabin having a door attached so as to freely open and close the entrance and a locking portion for locking the door. There,
A locking operation switch that is disposed in the working device and performs an operation for locking or unlocking the locking portion;
A locking drive unit disposed in the operation cabin and driving the locking unit to lock or unlock the door;
A door locking device for a working vehicle, wherein the operation of the locking drive unit is controlled in accordance with an operation of the locking operation switch. A chassis key switch disposed in the operation cabin and configured to turn on / off the power of the work device; and a power-on means for turning on / off the work device when the chassis key switch is on. Have
2. The work vehicle according to claim 1, wherein the operation of the locking drive unit is controlled according to an operation of the locking operation switch when the power-on means is turned on. Door locking device. Working state detecting means for detecting whether or not the working device is in a working state;
2. The apparatus according to claim 1, further comprising a controller that controls the locking drive unit and locks the door by the locking unit when the working state detection unit detects that the working device is in a working state. Or the door locking device of the working vehicle of 2. Storage state detection means for detecting whether or not the working device is in a storage state;
A controller for controlling the locking drive unit and unlocking the door by the locking unit when the storage device detects that the working device is in a stored state. The door locking device of the working vehicle as described in 1 or 2.

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