JP2590700Y2 - Work vehicle safety devices - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a working vehicle having a working device on a vehicle body.

[0002]

2. Description of the Related Art As a working vehicle used for power distribution work, a boom that can be raised and lowered and extended freely is arranged on a swivel provided on a vehicle body, and a work table is attached to a tip of the boom. And a cable towing vehicle in which a cable drum traction device is provided on a vehicle body. In these work vehicles, work devices such as a boom and a towing device are also provided on the vehicle body and operate by controlling supply and discharge of hydraulic pressure supplied from a hydraulic pump driven by an engine, an electric motor, and the like by a control valve. Many are configured to do so.

In such a work vehicle, a hydraulic pump, a control valve, and the like constitute a working device driving means. The working device driving means is driven and controlled by an operating device provided on a vehicle body or a work table. The drive is also controlled by a remote control device provided via a control cable connected to the vehicle body. Since this remote control device is easy to carry, there is a high possibility that moisture will enter the inside of the control device and cause a short circuit, as compared with a control device provided on the vehicle body, etc. In order to attach / detach the control unit, there is a case where moisture invades into the attachment / detachment part and a contact failure of the control cable occurs.

[0004]

Here, when the above-described remote control device is used, if a short circuit or a poor contact of the control cable occurs in the control device, the remote control device is driven to the working device driving means. There is a case where the signal is continuously transmitted. For example, in a state where the boom operation signal is continuously transmitted from the remote control device,
If you connect the control cable of the remote control device while the hydraulic pump is already operating, or operate the hydraulic pump with the control cable of the remote control device connected,
There has been a problem that the boom suddenly operates against the intention of the operator even though the operator does not operate the operation device, and it becomes impossible to perform a smooth operation.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a safety device for a work vehicle that performs an alarm operation when an operation device for controlling the operation of a work device provided on a vehicle body fails. It is an object.

[0006]

In order to achieve the above object, a safety device for a work vehicle according to the present invention is provided with a work device driving means for driving a work device disposed on a vehicle body. The operation device drives and controls the working device driving means. And a control state detecting means for detecting whether the operating device is in a controllable state in which drive control of the working device driving means by the operating device is possible or in a control impossible state in which drive control is not possible. After the detection signal changes from the uncontrollable state to the controllable state, the signal detection means transmits an alarm signal when detecting an operation signal from the operation device within a preset time, and from this signal detection means In response to the alarm signal, the alarm means performs an alarm operation.

[0007]

In such a safety device for a work vehicle, the signal detection means outputs an operation signal from the operation device for a predetermined time after the work device driving means for driving the work device changes from the uncontrollable state to the controllable state. Perform reception operation. Here, when the signal detection means receives an operation signal from the operation device within a predetermined time, an alarm signal is output. This alarm signal is input to the alarm means, and the alarm means issues an alarm by an alarm buzzer or an alarm lamp, or stops the operation of the working device to issue an alarm.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an example of a work vehicle having a safety device according to the present invention will be described with reference to FIG.
This work vehicle is a so-called high work vehicle, and a turntable 8 that can freely turn horizontally with respect to the vehicle body 1 is provided at a rear portion of the vehicle body 1 in the high work vehicle 10.
A boom 3 which is telescopically (telescopically) extendable and retractable is pivotally mounted on the upper part of the upper part of the upper part. At the end of the boom 3, a work table 4 is inserted via a vertical post 3 a.
The vertical post 3a is always held perpendicular to the tip of the boom 3, and the work table 4 can freely rotate horizontally with respect to the vertical post 3a.

As shown in FIG. 2, the turning operation of the turntable 8 is performed by a hydraulic motor 2 built in the vehicle body 1. The up-and-down operation of the boom 3 is performed by an up-and-down cylinder 5, and the expansion and contraction operation is performed by each hydraulic cylinder such as an expansion and contraction cylinder 6 provided inside the boom 3.
These hydraulic motors and hydraulic cylinders are operated by hydraulic pressure supplied from a hydraulic pump provided in a hydraulic power unit 9 disposed on the vehicle body. A drive source for driving the hydraulic pump includes a hydraulic power unit 9.
An engine provided in the vehicle is used, or a driving force of an engine (not shown) for driving the vehicle is extracted and used. The operation of the control valve 14 for controlling the supply and discharge of hydraulic oil from the hydraulic pump is controlled by the remote control device 20 or the control device (not shown) provided on the vehicle body 1 and the work table 4, so that the boom 3 is controlled. Perform operation control.

Here, a swivel, a boom and the like driven by a hydraulic motor, a hydraulic cylinder and the like constitute a working device described in the claims, and the engine, the hydraulic pump and the control valve constitute a working device described in the claims. This constitutes a driving means.

In the aerial work vehicle 10 configured as described above, an operation signal from the remote control device 20 is transmitted to the controller 7 provided on the vehicle body 1 by a control cable 21 as shown in FIG. This controller 7
The operation of the control valve 14 is controlled based on an operation signal from the remote control device 20. A plug (not shown) is provided at the other end of the control cable 21 having one end to which the remote control device 20 is attached, and can be connected to a receptacle 7a provided on the surface of the controller 7. The connection enables transmission of an operation signal from the remote control device 20 to the controller 7. Therefore, by operating the remote control device 20, the boom 3 can be turned, raised and lowered, and expanded and contracted.

The controller 7 is provided with control state detecting means 12 and signal detecting means 13. The control state detecting means 12 controls the boom 3 by the remote operation device 20.
Whether or not each of the operations can be performed (controllable state)
That is, it detects whether the engine for driving the hydraulic pump is operating, whether the plug of the control cable 21 is connected to the receptacle 7a, whether the main switch of the remote control device 20 is on, and the like. Also,
The signal detecting means 13 determines whether or not an operation signal has been transmitted from the remote control device 20 within a preset time (predetermined time) after the control state detecting means 12 changed from the uncontrollable state to the controllable state. Is detected. Here, the preset time is a fixed time during which no operation is normally performed after the control is possible. It is a short time of several seconds to several seconds.

That is, in a normal operation, each operation switch in the remote control device 20 is not operated immediately after the control is changed from the uncontrollable state to the controllable state. Therefore, when an operation signal is transmitted from the remote control device 20 for a few seconds after the control is changed from the uncontrollable state to the controllable state, a short-circuit, a contact failure, or the like may occur in the plug of the remote control device 20 or the control cable 21. It is considered that the malfunction is occurring and the operation signal is continuously transmitted.

[0014] Therefore, the signal detection means 13 is provided with an alarm means 15 when the reception of the operation signal is detected within a predetermined time.
To send an alarm signal. The alarm unit 15 that has received the alarm signal alerts the worker by turning on the alarm lamp 11 or sounding an alarm buzzer (not shown), and also outputs an operation signal from the remote operation device 20. Regardless, the operation stop signal for stopping the operation of the boom 3 by stopping the operation of the control valve 14 is transmitted to the control valve 14.

For example, it is assumed that the hydraulic power unit 9 is already operated by a switch provided on the vehicle body, and the boom 3 can be operated by operating the control valve 14. In this case, the plug of the control cable 21 to which the remote control device 20 to which the switch for transmitting the boom raising signal is short-circuited is connected to the receptacle 7a of the controller 7 or a remote control having a main switch is provided. In the operating device 20, when the main switch is turned on after the connection to the controller 7, the signal detecting means 13 receives an operating signal within a predetermined time. Also, when the hydraulic power unit 9 is operated after the remote control device 20 is connected to the controller 7, an alarm operation by the alarm means 15 is performed. Thereby, the operator operating the remote control device 20 can recognize that the remote control device is abnormal, and does not cause sudden operation of the boom 3 due to the short-circuited switch. Work can be done.

When the signal detecting means does not receive the operation signal within the above-mentioned predetermined time, each operation of the boom 3 is performed based on the operation signal from the operation device 20 after the lapse of the predetermined time.

In the above embodiment, the case where a remote control device connected by a control cable is used as the control device has been described. However, the present invention is not limited to this. The present invention can be used not only in an attached operation device, but also in a wireless remote operation device using an optical signal or the like.
Further, in the above embodiment, the hydraulic power unit 9
However, the present invention is not limited to this, and a motor driven by a battery as a drive source of the hydraulic pump as shown by a dashed line in FIG. 1 has been described. Of course, it can also be used in the case of using the battery-driven hydraulic power unit 19 to be used.

Further, each working device is not hydraulically driven,
It can also be used in the case of being driven by an electric motor. In this case, a battery for driving the electric motor and a control device for controlling electric power to each electric motor constitute working device driving means. It will be.

[0019]

As described above, in the work vehicle safety device according to the present invention, the work device driving means for driving the work device such as the boom is switched from the uncontrollable state to the controllable state for a predetermined period of time after the signal is turned on. The detection means performs an operation of receiving an operation signal from the operation device. When the signal detection means receives an operation signal from the operation device within a predetermined time, an alarm signal is output to the alarm means, and the alarm means issues an alarm with an alarm buzzer, an alarm lamp, or drives the working device. It is stopped and an alarm is given.

[Brief description of the drawings]

FIG. 1 is a perspective view of a working vehicle provided with a safety device according to the present invention.

FIG. 2 is a block diagram of the safety device.

[Explanation of symbols]

 3 Boom 7 Controller 7a Receptacle 9 Hydraulic Power Unit 11 Alarm Lamp 20 Remote Control Device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66F 9/00-11/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A working device disposed on a vehicle body, a working device driving means for driving the working device, an operating device for controlling the driving of the working device driving device, and the working device using the operating device Control state detection means for detecting whether the drive means is in a controllable state in which drive control is possible or in a control impossible state in which drive control is not possible; and a detection signal from the control state detection means cannot be controlled. Signal detection means for transmitting an alarm signal when an operation signal from the operation device is detected within a preset time after the state is changed from a controllable state to a controllable state; and receiving an alarm signal from the signal detection means. And a warning device for performing a warning operation.