JPH0515513Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field This invention is a remote control device used for work vehicles such as crane trucks and cable feeding vehicles, which stops the operation of the crane device or cable feeding device in an emergency. This invention relates to an emergency stop circuit for a remote control device.

(2) Conventional technology A method of attaching a remote control device to a work vehicle such as a crane truck so that the work vehicle can be operated from a distance from the work vehicle is known, for example, as disclosed in Japanese Patent Laid-Open Publication No.
It is conventionally known as described in Japanese Patent No. 56-94007.

(3) Problems that the invention aims to solve However, as shown in Fig. 2, the emergency stop device of the conventional remote control device is not equipped with the main body 1 of the work vehicle when the remote control device 2 is connected. Since the normally closed first emergency stop switch 3 and the normally closed second emergency stop switch 4 provided in the remote control device 2 were simply connected in series, the remote control device 2 was When removed from the main body, the current flowing to the emergency stop relay 6 is cut off, the emergency stop relay 6 becomes activated, and the operating device on the main body side becomes inoperable.

(4) Means for Solving the Problems In order to solve the above problems, the present invention incorporates a normally closed first emergency stop switch provided on the main body of the work vehicle and a remote control device. a normally closed second emergency stop switch provided on the remote control device that is connected in series with the first emergency stop switch when connected to the main body; an emergency stop relay provided on the main body side and connected in series with the first emergency stop switch;
A control device consisting of a transistor whose emitter is connected to a power supply, whose base is connected to a circuit branched from between a terminal of a remote control device and a second emergency stop switch, and a relay which is connected to the collector of this transistor and controls the contact point. When the voltage returned from the remote control device becomes zero, the control section detects the detached state of the remote control device and closes the contact.

(5) Effect With the above configuration, when the remote control device is connected to the main body of the work vehicle, the first emergency stop switch of the main body and the second emergency stop switch of the remote control device are connected in series. Therefore, an emergency stop can be performed using either the first emergency stop switch or the second emergency stop switch, and when the remote control device is removed from the main body, the voltage returned from the remote control device becomes 0. Since the contact is closed by the control unit, a circuit of the first emergency stop switch is formed.

(6) Examples Examples of the present invention will be described below with reference to the drawings.

The work vehicle is equipped with an operating device on the main body side, and
A remote control device is detachably connected to the remote control device 2, and as shown in FIG. It is connected to the second emergency stop switch 4, returns from the second emergency stop switch 4 to the main body 1 side via the terminals 11 and 10, and connects to the normally closed first emergency stop switch 3 and the emergency stop relay 6. By sequentially connecting the first emergency stop switch 3 and the second emergency stop switch 4, the first emergency stop switch 3 and the second emergency stop switch 4 are connected in series.
The power supply 5 is connected to the emitter of a PNP transistor 7, and the collector of the transistor 7 is connected to a relay 14 that controls the contact 15. A circuit branched from between terminal 9 and second emergency stop switch 4 is connected to terminal 13 and terminal 1.
2 to the main body 1 side, and is connected to the base of the transistor 7.
A control section is configured that detects the detached state of the remote control device 2 and closes the contact 15 when the voltage returned from the terminal becomes 0.

With the above configuration, each terminal 8, 9, 10, 1
When the remote control device 2 is connected to the main body 1 by terminals 1, 12, and 13, voltage is applied to the base of the transistor 7 through the terminals 13, 12, so no current flows through the relay 14, and the contacts are closed. 15 is held in the open state, and by pushing the first emergency stop switch 3 or the second emergency stop switch 4 to open the emergency stop switch 6, the electric current of the emergency stop switch 6 is cut off, and the operation stop device is activated. The work vehicle stops working.

When the terminals 8, 10, and 12 are disconnected and the remote control device 2 is removed from the main body 1, the voltage applied to the base of the transistor 7 via the terminal 12 becomes 0, so current flows to the relay 14. Since the contact 15 is closed, the current flowing to the emergency stop relay 6 is maintained, and even if the remote control device 2 is removed from the main body 1, the operation stop device will not operate. Only when the emergency stop relay 6 is opened, the current to the emergency stop relay 6 is cut off, the operation stop device is activated, and the operation of the work vehicle is stopped.

(7) Effects of the invention As described above, according to the invention, in an emergency stop circuit in which a normally closed emergency stop switch is provided on the work vehicle main body and a remote control device, when the remote control device is attached to the main body, The operation of the work vehicle can be stopped by operating any emergency stop switch on the main body side or the remote control device side, and when the remote control device is removed from the main body, the operation of the work vehicle can be stopped by operating the emergency stop switch on the main body side. Since the operation of the work vehicle can be stopped, the present invention is effective in improving the safety of work vehicles equipped with a remote control device.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an embodiment of an emergency stop circuit for a remote control device according to the present invention, and FIG. 2 is an electric circuit diagram showing a conventional example. 1...Main unit, 2...Remote control device, 3...First emergency stop switch, 4...Second
emergency stop switch, 5...power supply, 6...emergency stop relay, 7...PNP transistor, 8,9,
10, 11, 12, 13...terminal, 14...relay, 15...contact.

Claims (1)

[Scope of utility model registration request] A normally closed first emergency stop switch is provided on the main body of the work vehicle, and a always closed emergency stop switch is provided on a remote control device that is connected in series with the first emergency stop switch when the remote control device is connected to the main body. A closed second emergency stop switch, a contact provided in a circuit provided on the main body side and short-circuiting between the first emergency stop switch and the second emergency stop switch, and a first emergency stop switch provided on the main body side. An emergency stop relay connected in series with the stop switch, a transistor whose emitter is connected to a power source and whose base is connected to a circuit branched from between a terminal of a remote control device and a second emergency stop switch, and a collector of this transistor. a control unit configured of a relay that controls the contact;
An emergency stop circuit for a remote control device, characterized in that the controller detects a detached state of the remote control device when the voltage returned from the remote control device becomes 0, and closes the contact.