JP3003073B2 - Industrial machine with anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the prevention of theft of industrial machines such as civil engineering machines and construction machines.

[0002]

2. Description of the Related Art As a conventional anti-theft device for industrial machines, there is an anti-theft device for an electronic hydraulic machine shown in FIGS. 4 to 6 (see Japanese Patent Application Laid-Open No. 2-132233). As shown in FIG. 4, this device includes an engine switch 31 disposed between a battery 30 and a control circuit device 40 that operates an electromagnetic drive unit of a hydraulic valve device and a starter motor 32 of a hydraulic pump driving engine. Switch 34 that conducts only to a hydraulic machine equipped with a predetermined combination code
A line between the battery 30 and the engine key switch 31, a line between the engine key switch 31 and the control circuit device 40, a line between the manipulated variable input means 39 and the control circuit device 40, or control. It is arranged on the line between the circuit device and the electromagnetic drive section 38 of the hydraulic control valve. As shown in FIGS. 5 and 6, this combination switch 34 accommodates a plurality of small unit slide switches 35 in one casing 36 and
One of the five fixed contact terminals 35a and 35b is alternatively connected to the movable contact terminal 35c of the movable contact 35d of the adjacent unit slide switch 35. The movable contact 35d of each unit slide switch 35
Input position of the combination switch
7 and the output end 38 are brought into conduction.
If the combination switch 34 is turned off, the system does not operate with the engine key 31 alone, so the hydraulic machine does not operate and theft is prevented. When the combination switch 34 is turned on, the engine can be started and stopped only by the engine key 31.

[0003]

This anti-theft technique has an effect that the setting of the combination of the combination switches cannot be easily read and understood, so that the engine is not connected to the engine and the engine is not operated. However, in this structure, the anti-theft device is interposed between each operating component, respectively.
Its existence is easily noticeable. If considered badly, there is a problem that the line between the input terminal and the output terminal at both ends of the combination switch is disconnected, and if the line is directly connected, the connection is conducted.

[0004] Further, since a combination switch is provided between each device, there is also a problem that the number is large and it is difficult to set each combination code.

The present invention is further improved to solve such a conventional problem, and has as its object to centrally control the operation cuts of electric equipment for operating a power supply, a fuel, and a hydraulic circuit. By using a single device, the anti-theft device that stops all running functions is placed in an invisible position, and even if it is found, it is equipped with a reliable anti-theft device that cannot be easily clarified due to complicated lines. To provide industrial machinery.

[0006]

In order to achieve the above object, an industrial machine with an anti-theft device according to the present invention is provided with a power source for operating the engine, fuel supplied to the engine, and a hydraulic device provided with a hydraulic device. Withdrawing the way of supplying electricity to each operating electric device of the supply control device, forming an electric circuit for centralized control at one place, accepting only a special password as a control method in that circuit, and forming a circuit An anti-theft device was interposed. That is, the middle of the line between the operating electrical device of the industrial machine and the power supply unit is drawn out and concentrated in one place, and the main switch, the voltage conversion unit, and the password identification unit are included in the circuit. , Keyboard and
Turn on the main switch, enter a preset password using the keyboard, collate the signal with the password determination unit, and check the signal. As long as they do not match, even if the starter key is inserted, power is not supplied from the power supply unit to the circuit relay for connection of the operating electric device, and the industrial machine does not operate.

[0007]

The electric equipment of the industrial machine becomes inoperable by cutting the circuit of each electric machine for operation of the industrial machine. Even if it is attempted to steal an industrial machine equipped with the anti-theft device, it is difficult to find the location of the anti-theft device.
Further, even if an anti-theft device is found, since the lines are complicated, there is no way to know the wiring, and there is no way to do anything.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. An example of this industrial machine is a power shovel. In the figure, reference numeral 10 denotes a power supply unit, and a battery 12
V are provided in series. The power supply unit 10 is connected to the starter motor 12 via the power supply unit relay 11, and when the engine key switch is turned on, the starter motor 12 is driven and the engine 13 starts. A hydraulic pump 15 is provided directly connected to the engine 13. Hydraulic pump 1
5 is a traveling motor via the hydraulic control solenoid valve 20,
The hydraulic pressure is sent to the swing motor and the working hydraulic motor that operates the arm, boom and bucket. On the other hand, the engine 13 is supplied with fuel from a fuel tank 14 via a fuel pump. Further, there is a type in which the fuel supply into the engine 13 is automatically adjusted via the fuel adjustment computer 18 depending on the vehicle type. In order to cut off electricity to the electric devices of these traveling devices, the antitheft device 1 which is a feature of the present invention is connected to the power supply unit 10 and each of the operating electric devices 12 and 1.
Each of the lines 8, 19 and 20 was drawn out, and an electric circuit was formed by concentrating the circuit at one location, and the antitheft device 1 was interposed in the circuit. That is, as shown in FIG.
0, the starter motor 12 and the fuel pump 19
The fuel adjustment computer 18 and the hydraulic control solenoid valve 20 are connected in parallel. The line between the power supply unit 10 and the starter motor 12 that operates the engine is led to the anti-theft device 1 and returned again. A line connected to a fuel pump 19 for supplying fuel to the engine 13;
And return again. The line between the fuel adjusting computer 18 and the fuel adjusting computer 18 for automatically adjusting and supplying the fuel from the fuel tank 14 to the engine 13 is led to the anti-theft device 1 and returned. The line from the hydraulic pump 15 to the hydraulic control solenoid valve 20 is led to the anti-theft device 1 and returned again. Then, each led line is connected in series to the anti-theft device.

The anti-theft device 1 includes a main switch 4 for turning on and off the current from the power supply unit 10, a DC-DC converter 5, a circuit relay 7, and a password identification unit 3 connected to the main relay 6. Further, a keyboard 2 is provided. The DC-DC converter 5 reduces the voltage of 24V from the main switch 4 to 5V. The keyboard of the keyboard 2 has keys for numbers and characters of 0 to 9, A to F, and RESET, and is set so that a 4-digit combination of 1 to 9 and A to E can be entered. The password identification unit 3 is configured to accept only one preset password. Two lines between the password determination unit 3 and the keyboard 2 are for power supply, and five lines are for signal of the password. The anti-theft device 1 can be stored in a small case, and can be set at any position of the power shovel if the wiring is well handled. If it can be operated, it is desirable to attach it to a place where it can be hidden so that the anti-theft device is not visible.

Next, the operation will be described. A password is set in advance, and only the password set in the password determination unit 3 is received. When operating the power shovel, first, the main switch 4 of the anti-theft device 1 set in a hidden place of the power shovel is turned on. A voltage is applied from the power supply unit 10, the voltage is reduced by the DC-DC converter 5, and a voltage is applied to the password identification unit 3 and the keyboard 2, but no voltage is applied to the main relay 6 and a circuit relay is applied. No voltage is also applied to 7. When a preset four-digit password is input on the keyboard 2, the password data is verified by the password determination unit 3 to determine whether the number data is correct. When the password matches the preset number, the voltage is applied to the main relay 6. The excitation is applied and the main relay 6 is connected. If the passwords are different, the main relay 6 is not connected and there is no response.

Next, when the main relay 6 is connected, a voltage is applied to the circuit relay 7 to excite it to form a circuit with the electric equipment of the traveling device, and each electric equipment, that is, the cell motor 12 for starting the engine, the fuel, Electric power is supplied to a fuel pump 19 for supplying fuel from the tank 14 to the engine, and also to a solenoid valve 20 for hydraulic control, so that each electric device becomes operable. Therefore, if the engine key is inserted into the key hole and the key is turned as usual with a power shovel, the starter motor 1
2, the fuel pump 19 sends fuel to the engine 13, and the engine starts. Similarly, the hydraulic control solenoid valve 20 that has shut off the hydraulic pressure from the hydraulic pump 15 starts controlling the hydraulic pressure and the vehicle can travel.

To end the operation of the power shovel and stop the power shovel, the user turns off the key and removes the key as usual. Thereafter, when the main switch 4 of the anti-theft device 1 is turned off, no voltage is applied to the main relay 6, the circuit relay 7, the keyboard 2, and the password identification unit 3, and the main relay 6 and the circuit relay 7 are disconnected. Since the circuit with each of the electric devices 12, 18, 19, and 20 is released, no voltage is applied to each of the electric devices, and the electric devices do not operate.

It is also possible to set a plurality of encryption numbers. In that case, the password identification unit 3 may be further increased in parallel. According to the present invention, the electric circuit is greatly different from the conventional electric circuit, that is, the electric circuit from the power supply unit 10 is connected in parallel to each operating electric device so as to actively turn on and off the power supply from the power supply unit 10. Since the line is once concentrated and led to the anti-theft device, and the line is connected, the amount of the line increases and the connection work is required. However, once the connection is completed, the layman cannot read and understand this electrical circuit.

[0014]

The present invention has the following effects by connecting an anti-theft device in series to a circuit of an electric device for operating a traveling device of an industrial machine.

[0015] Unless the circuit relay is connected, the electric circuit of the electric equipment is in an open state, the electric power is not conducted from the power supply unit to the electric equipment, and the electric equipment becomes inoperable. By inputting the personal identification number, the circuit relay is connected, a circuit is formed with the electric device, and normal operation of the electric device is enabled. or,
The circuit relay is centrally controlled by the main relay.

Even if electricity is supplied from another power source, all the electric devices cannot be connected at a time because of the complicated wiring structure, and each electric device cannot be connected at a plurality of places in series with the anti-theft device. Since it is wired, it is very difficult to connect all the lines from outside.

Further, even if the anti-theft device is removed, one electrical circuit is formed for the first time after the anti-theft device is connected. It is impossible to run industrial machines at all. Therefore, industrial machines cannot run on their own,
It becomes theft prevention.

[0018] Changing the password requires a special operation, so that the password cannot be invalidated.

The number of lines to be controlled can be increased in parallel.

A plurality of passwords can be set. In that case, it is necessary to increase the number of substrates of the personal identification number determination unit in parallel and further set a personal identification number.

[Brief description of the drawings]

FIG. 1 is a block diagram of an industrial machine with an anti-theft device showing one embodiment of the present invention.

FIG. 2 is a circuit diagram showing an anti-theft device according to one embodiment of the present invention.

FIG. 3 is a flowchart of one embodiment of the present invention.

FIG. 4 is a block diagram of a conventional electronically controlled hydraulic machine with an anti-theft device.

FIG. 5 is a perspective view of a conventional combination switch.

FIG. 6 is an explanatory diagram showing a switching position of each movable contact when a conventional combination switch is in a conductive state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Theft prevention device 2 Keyboard 3 Password identification part 4 Main switch 5 DC-DC converter 6 Main relay 7 Circuit relay 10 Power supply part 12, 18, 19, 20 Electric equipment 13 Engine 14 Fuel tank 15 Hydraulic pump 16 Traveling motor

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60R 25/04 E02F 9/24

Claims (3)

(57) [Claims] An engine, a fuel pump for supplying fuel from a fuel tank to the engine, a starter motor for starting the engine, and a hydraulic pressure which is directly connected to the engine and is used for a solenoid valve for hydraulic control. A hydraulic pump, a power supply, and a power supply line for connecting one terminal of the power supply to at least one of the power supply inputs of the fuel pump, the starter motor, and the solenoid valve for hydraulic control, and the fuel pump, the starter motor, and the hydraulic control. In an industrial machine having one end connected to the other power input portion of the solenoid valve for use and the other end connected to a power line concentrated on the anti-theft device, the anti-theft device has one terminal of the power supply. A DC-DC converter connected via a switch, the other terminal of the power supply being directly connected, and obtaining a low voltage; It is connected to one input terminal one terminal of the voltage side through the main relay, the DC-
The other terminal of the DC converter is directly connected to the other input terminal, and when turned on, a circuit relay for energizing each power supply line concentrated in the anti-theft device; and A keyboard for inputting, the low voltage is given, it is determined whether or not the password input from the keyboard is correct, and only when the password is correct, the main relay is turned on and the DC-DC converter and the An industrial machine with an anti-theft device, comprising: a password determination unit for energizing between circuit relays; and an engine key capable of driving the starter motor after the circuit relay is turned on. 2. An engine, a fuel pump for supplying fuel from a fuel tank to the engine, a starter motor for starting the engine, and a hydraulic pressure directly connected to the engine for applying a hydraulic pressure to a solenoid valve for hydraulic control. A hydraulic pump, a power supply, and a power supply line for connecting one terminal of the power supply to at least one of the power supply inputs of the fuel pump, the starter motor, and the solenoid valve for hydraulic control, and the fuel pump, the starter motor, and the hydraulic control. In an industrial machine having one end connected to the other power input portion of the solenoid valve for use and the other end connected to a power line concentrated on the anti-theft device, the anti-theft device has one terminal of the power supply. A DC-DC converter connected via a switch, the other terminal of the power supply being directly connected, and obtaining a low voltage; It is connected to one input terminal one terminal of the voltage side through the main relay, the DC-
The other terminal of the DC converter is directly connected to the other input terminal, and when turned on, a circuit relay for energizing each power supply line concentrated in the anti-theft device; and A keyboard for inputting, the low voltage is given, it is determined whether or not the password input from the keyboard is correct, and only when the password is correct, the main relay is turned on and the DC-DC converter and the An industrial machine with an anti-theft device, comprising: a password identification unit for energizing between circuit relays. 3. The industrial machine with an anti-theft device according to claim 3, further comprising an engine key capable of driving the starter motor after the circuit relay is turned on.