JPH0555440B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a remote control device that enables starting and stopping of the engine of a high-altitude work vehicle from the work platform of the high-altitude work vehicle.

(Prior art) When working on the workbench at the tip of the boom using an aerial work vehicle, change (move) the work position.
The structure is such that pressure oil from a hydraulic pump driven by a vehicle engine is supplied to a corresponding hydraulic actuator via a hydraulic control valve whose switching is controlled by operating an operating lever on the workbench. ing. In addition, in order to avoid losing the balance of the employee's vehicle, when the work platform exceeds a predetermined work range (referred to as a safe work range), an electromagnetic control valve automatically prevents the work platform from moving in a direction beyond the safe work range. It is designed to be stopped. moreover,
In view of nighttime work, in order to prevent engine noise from occurring, it is common practice to stop the vehicle engine from the workbench and restart it when necessary.

By the way, in a conventional electric circuit for remotely starting or stopping the engine of a work vehicle, current always flows to the above-mentioned electromagnetic control valve even when the engine is stopped. For aerial work vehicles with such electrical circuits,
When working at heights for a long time, there is a risk that the battery of the work vehicle may become discharged due to the power consumed by the solenoid.

(Purpose of the Invention) The present invention was made in view of the above-mentioned current situation, and when the work platform is not being moved, the current is not wasted by preventing current from flowing through the electric circuit that starts or stops the engine of the work vehicle. An object of the present invention is to provide a remote control device for an aerial work vehicle that is equipped with an electric circuit that can prevent battery consumption.

(Structure of the Invention) A remote control device for an aerial work vehicle according to the present invention includes:
(1). A boom device equipped with a workbench at the tip is installed on a swivel platform mounted on the vehicle frame, and an electromagnetic control valve is installed to detect when the workbench is within a safe work range and enable boom-related operations. In addition, in the aerial work vehicle in which starting and stopping of the vehicle engine can be remotely controlled from the workbench, when the work engine is stopped, the solenoid of the electromagnetic control valve is prevented from being energized. It is characterized by

Also, (2). The remote control device for the aerial work vehicle is
The boom device in (1) consists of a lower boom whose base end is pivotally connected to the swivel table and which can be raised and lowered, and an upper boom whose base end is pivotally connected to the tip of the lower boom and which can be raised and lowered. Features.

Furthermore, (3). The remote control device for an aerial work vehicle is characterized in that the safe work range in (1) or (2) above is detected by an angle sensor that detects a predetermined angle range of the upper boom with respect to a horizontal plane. .

(Embodiments, Effects) Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 indicates a high-altitude work vehicle, in which the base end of a lower boom 4 is pivotally mounted on a swivel platform 3 driven by a slewing motor 3' mounted on a rear chassis 2, and a luffing cylinder 5 is mounted. The upper boom 6 is pivoted to the tip of the lower boom 4 so that it can be raised and lowered freely by a moving cylinder 7, and the work platform 8 is provided at the tip of the upper boom 6. Become. In addition, the reference numeral 9 is an operating lever installed on the workbench 8.
This lever 9 allows switching of the switching valves of the swing motor 3', the undulating cylinder 5, and the moving cylinder 7 via a control cable. Further, the workbench 8 is equipped with a conventional engine start and stop switch.

Furthermore, a limit switch for an angle sensor is attached to the base end of the upper boom 6 to detect when the upper boom 6 exceeds a predetermined angle with respect to the horizontal plane.

Next, FIG. 2 shows the hydraulic circuit of the working vehicle 1. As shown in FIG.
In FIG. 2, 10 is an oil tank, 11 is a hydraulic pump, 12 is a 3-position manual switching valve for operating the hoisting cylinder 5, 13 is a 3-position manual switching valve for operating the moving cylinder 7, and 14 is a swing motor 3'. 3 for operation
The position manual switching valve 15 is an electromagnetic control valve for the undulating cylinder 5, and 16 is an electromagnetic control valve for the moving cylinder 7.

In the hydraulic circuit, the switching valves 12, 1
By setting 3 and 14 to the central position,
Pressure oil from the hydraulic pump 11 returns to the oil tank 10 via an oil supply pipe 17, switching valves 12, 13, 14, and an oil drain pipe 18.

The expansion and contraction operation of the undulation cylinder 5 is performed by a manual switching valve 12.
By switching to the upper position, the oil tank 10
Pressure oil is sent to the base end of the reciprocating type luffing cylinder 5 through an oil supply pipe 17, a switching valve 12, and an oil supply/drainage pipe 19 in which a pilot check valve 20 is interposed. Since the pressure oil to the base end of the hoisting cylinder 5 opens the pilot check valve 22, the drained oil from the tip of the hoisting cylinder 5 passes through the oil supply and drain pipe 21 in which the pilot check valve 22 is interposed, and the check valve 24
Bypass oil drain pipe 23, oil supply and drain pipe 25,
Oil tank 10 via switching valve 12 and oil drain pipe 18
Return to , and extend the undulation cylinder 5. On the other hand, by switching the manual switching valve 12 to the lower position with the electromagnetic control valve 15 switched to the left position,
Pressure oil from the oil tank 10 is sent to the tip of the cylinder 5 via the switching valve 12, the oil supply/drain pipe 25, the control valve 15, and the oil supply/drain pipe 23. Since the pressure oil to the tip of the cylinder 5 opens the pilot check valve 20, the drained oil from the base end of the undulating cylinder 5 passes through the oil supply and drain pipe 19, and further passes through the switching valve 12 and the oil supply and drain pipe 18 to the oil tank. Return to step 10 and contract the undulating cylinder 5.

Incidentally, since only the extension operation of the undulating cylinder 5 is performed without going through the control valve 15 as described above, it is possible even if the control valve 15 is switched to the neutral (non-operating) position shown in the figure.

The expansion and contraction operation of the movable cylinder 7 is performed with the electromagnetic control valve 16 switched to the left (raising and lowering operation) position.
By switching the manual switching valve 13 to the lower position, pressure oil from the hydraulic pump 11 is transferred to the oil supply pipe 17, the bypass oil supply pipe 26, the switching valve 13, the oil supply and drain pipe 27,
The oil is sent to the base end of the movable cylinder 7 via the control valve 16 and the oil supply/drainage pipe 28 in which the pilot check valve 29 is interposed, and the drained oil from the tip of the movable cylinder 7 is passed through the oil supply/drainage pipe 30, the switching valve 13, and the oil discharge pipe 18. Then, it returns to the oil tank 10, and the moving cylinder 7 is extended. On the other hand, by switching the manual switching valve 13 to the upper position, pressure oil from the hydraulic pump 11 is sent to the tip of the cylinder 7 via the oil supply pipe 17, the bypass oil supply pipe 26, the switching valve 13, and the oil supply/drainage pipe 30. Since the pressure oil to the base end of the cylinder 7 opens the pilot check valve 29, the drain oil from the base end of the cylinder 7 is drained from the oil drain pipe 28, the bypass oil drain pipe 31 with a check valve 32 interposed therein, It returns to the oil tank 10 via the oil supply and drain pipe 27, the switching valve 13, and the oil drain pipe 18, and the moving cylinder 7 is contracted. It should be noted that since only the contraction operation of the movable cylinder 7 is performed without going through the control valve 16 as described above, it is possible even if the control valve 16 is switched to the neutral (non-operating) position shown in the figure.

The operation of the swing motor 3' for turning the swing table 3 in a predetermined direction is performed by switching the manual switching valve 14 to the upper position or lower position, so that the pressure oil from the hydraulic pump 11 is transferred to the oil supply pipe 17 and the switching valve 12. Alternatively, it is sent to the switching valve 14 via the bypass oil supply pipes 26 and 32, and from this switching valve 14 to the oil supply and drainage pipe 33 or 34.
The drain oil from the swing motor 3' is sent to the swing motor 3' via the oil supply/drain pipe 34 or 33, the switching valve 14, and the oil drain pipe 18, and returned to the oil tank 10. Rotate in the opposite direction.

Note that all of these operations are performed using the operating lever 9 of the workbench 8.

Next, the electric circuit will be explained.

In Fig. 3, 41 is the battery of the work vehicle;
42 is an ACC switch located at the engine key position of the working vehicle; 43 is a detection switch that detects the contact operation of the power take-off device; and 44 is an angle sensor that opens the contact when the upper boom 6 exceeds a predetermined angle with respect to the horizontal plane. 45 is a warning buzzer, 46 is a starter motor for starting the engine, 47 is a solenoid for the control valve 15, 48 is a solenoid for the control valve 16, 49 is a switch for starting the engine, and 50 is a switch for stopping the engine. Both switches 49 and 50 are provided near the operating lever 9 of the workbench 8.

In order to enable movement of the workbench 8, first the ACC switch 42 and the detection switch 43 are turned on. In this state, relay coil R ₁
and _R7 are excited, the a contacts _r1 and _r7 are closed and the solenoids 47 and 48 are energized, and the b contact _r1 is open and the buzzer 45 is not energized.
Here, turn on the engine starting switch 49 on the workbench 8.
When turned ON, relay coils R ₂ and R ₅ are excited, B contact R ₂ is opened, A contact R ₅ is closed, the starting motor 46 rotates, and the engine (not shown) is started. .

In this state, the position of the workbench 8 can be changed by switching the switching valves 12, 13, and 14 using the operating lever 9 on the workbench 8. Note that if the upper boom 6 exceeds a predetermined angle with respect to the horizontal plane while changing the position of the workbench 8, the limit switch 44 is turned OFF, the excitation of the relay coil _R1 is cut off, the a contact _R1 is opened, and the solenoid 47, 48 is stopped, the switching valves 12 and 13 return to their neutral positions, and b
Contact _r1 is closed and the alarm buzzer 45 sounds. By the way, even when the switching valves 12 and 13 are in the neutral position, the upper boom 6
Since the lower boom 4 can move downward and the lower boom 4 can move upward, when the upper boom 6 returns to the safe range due to the upward and downward movement of both booms 4 and 6, the unit switch 44 is activated.
It turns ON and relay coil _R1 is energized again, making contact a.
_r1 is closed and the solenoids 47 and 48 are energized, and b contact _r1 is opened and the buzzer 45 stops.

In this way, when the position of the workbench 7 is determined and there is no need to change the position, when the engine stop switch 50 is turned on, relay coils R ₃ and R _{4 are} turned on.
is excited, and the a contact _R3 is closed and self-maintained, so even if the switch 50 is turned off, the relay coils _R3 and _R4 remain in the excited state. In this state b
Contact _R4 becomes open and power to the engine key is cut off, so the engine stops. Contact _R3 becomes open and power to solenoids 47 and 48 is stopped, and the switching valves 12 and 13 are placed in the neutral position. be returned.

As explained above, according to the remote control device of the present invention, when the engine is stopped, the power supply from the battery to the solenoid is completely stopped, so that the battery will not be discharged even when the work is carried out for a long time. Therefore, it is possible to prevent unnecessary power consumption, and therefore, the engine can be started reliably and work at heights can be carried out safely.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic front view of an aerial work vehicle, FIG. 2 is a hydraulic circuit diagram, and FIG. 3 is a hydraulic circuit diagram.
The figure is an electrical circuit diagram. DESCRIPTION OF SYMBOLS 1...Aerial work vehicle, 3...Swivel base, 3'...Swivel motor, 4...Lower boom, 5...Luffing cylinder, 6...Upper boom, 7...Movement cylinder, 8...
...Workbench, 9...Operation lever, 12, 13, 14
...Manual switching valve, 15, 16...Solenoid control valve, 4
4... Limit switch, 47, 48... Solenoid.

Claims (1)

[Claims] 1. A boom device equipped with a workbench at the tip is provided on a swivel platform mounted on a vehicle frame, and boom-related operations are enabled by detecting that the workbench is within a safe work range. In the aerial work vehicle, the vehicle is equipped with an electromagnetic control valve that enables remote control of starting and stopping of the vehicle engine from the workbench, and when the engine is stopped, the solenoid of the electromagnetic control valve is energized. A remote control device for an aerial work vehicle, characterized in that it prevents. 2. Claims in which the boom device comprises a lower boom whose base end is pivotally connected to a swivel table and which can be raised and lowered freely, and an upper boom whose base end is pivotally connected to the tip of the lower boom and which can be raised and lowered freely. A remote control device for an aerial work vehicle according to item 1. 3. The safe work range is detected by an angle sensor that detects a predetermined angle range of the upper boom with respect to the horizontal plane.
Remote control device for the aerial work vehicle described in Section 1.