JP3233573B2 - Hydraulic machinery 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 an anti-theft device for hydraulic machines, and more particularly to an anti-theft device for hydraulic machines including construction machines such as hydraulic excavators.

[0002]

2. Description of the Related Art Various types of anti-theft devices for construction machines and general automobiles have been considered. As an example, a key input board called a numeric keypad is arranged at a relatively easy-to-understand and easy-to-operate position of the vehicle, and the key input board is pressed and input in a predetermined reciting number order, and thereby an unlocking control device is provided. Driving of the vehicle only when the password stored in
Many prevent theft by allowing the internal combustion engine to start. These are disclosed, for example, in
No. -4936. In addition, these conventional devices are systems in which once the entire power supply of the vehicle is turned off by key-off, a key input by a key input board is always required at the time of restart.

[0003]

However, when the above-described conventional anti-theft device is applied to a construction machine such as a hydraulic shovel, there are the following problems.

In a hydraulic excavator, for example, once a minute, the hydraulic excavator is driven to excavate earth and sand, or the operator gets out of the driver's seat and excavates with a scoop, depending on construction conditions, depending on the situation at the site. There is a task of repeating the manual work alternately. In this case, when the operator gets off the driver's seat and leveles the earth with a scoop, it is essential to stop the operation of the hydraulic excavator in order to ensure safety. For this reason, when performing the above operation, the operation and stop of the excavator are repeated quite frequently, and the conventional anti-theft device restarts the operation of the excavator when performing such an operation. Each time, the PIN had to be re-entered on the key input board, which was a great deal of trouble.

It is an object of the present invention to provide an anti-theft device for a hydraulic machine that does not impair the ability to prevent theft and that can easily resume the operation when the operation of the hydraulic machine is frequently repeated.

[0006]

(1) In order to achieve the above object, the present invention provides a key switch for controlling start and stop of an internal combustion engine, code input means, and a key switch for turning on and off the key switch. When a predetermined code is input to the code input means, an unlocking electronic device that generates an unlocking signal,
An anti-theft device for a hydraulic machine, comprising: lock means for enabling operation of the hydraulic machine when the unlock signal is generated, and disabling the operation of the hydraulic machine when the unlock signal is not generated. A lock input means for instructing whether or not to set a lock state by an operation of an operator;
To set whether to set the auto lock
Further comprising a lock input means , wherein the unlocking electronic device comprises:
When the key switch is turned off, when the lock input means is instructing the setting of the lock state, the lock state is set and the unlocking electronic device is shut down, and the lock input means sets the lock state. First unlocking control means for setting an unlocked state to shut down the unlocking electronic device when not instructed; and when the locked state is set, the key switch is turned on and the code input means is set. a second unlocking control means for generating the unlocking signal only oN of the key switch when the predetermined code is generated a Kikaijo signal pre comes to have been entered, the unlock state is set to, If the auto lock input means is
While the key lock setting is not instructed,
When the switch is turned off, the first unlock control means
Set the locked or unlocked state to unlock the electronic
System down, the auto lock input means
While instructing the auto lock setting, press the key switch
Always set the lock state when the switch is turned off.
Third unlock control means for shutting down the unlock electronic device
And it further has.

[0007] In the present invention, which is configured as described above, Oh
Do not instruct the setting of auto lock with the port lock input means
In this case (manual lock mode), when the operator turns off the key switch and instructs the lock input means to set the lock state when the hydraulic machine is stopped, the first unlock control means sets the lock state and unlocks the electronic device. the apparatus is the system down, generate subsequent time of the hydraulic machine start, unlock signal can an operator turns oN the second unlocking control means keyswitch predetermined code is entered conventionally code input means, hydraulic Enables machine operation. Further, when the hydraulic machine is stopped, if the operator merely turns off the key switch and does not instruct the setting of the lock state by the lock input means, the first unlock control means sets the unlock state and activates the unlock electronic device. When the system is shut down and the hydraulic machine is subsequently started, the second unlock control means outputs an unlock signal only by turning on the key switch, thereby enabling the operation of the hydraulic machine.

Therefore, when the hydraulic machine is normally stopped,
By instructing the setting of the lock state by the lock input means, the unlocking electronic device shuts down the system in the lock state, and the person who does not know the predetermined code cannot operate the hydraulic machine, thereby preventing theft. In the case where the operation and stop of the hydraulic machine are frequently repeated and the work is temporarily performed outside the vehicle or during a short break, the system can be shut down without instructing the lock input means to set the lock state, and the operation can be easily restarted.

[0009]

On the other hand, if the setting of the auto lock is instructed by the auto lock input means, when the hydraulic machine is stopped, when the operator turns off the key switch, the third unlock control is performed regardless of the operation state of the lock input means. means to system down to unlock the electronic device sets the lock state, at the start of a subsequent hydraulic machine, comes the operator turns ON the second unlocking control means the key switch has been entered conventionally predetermined code solutions A lock signal is generated to enable operation of the hydraulic machine (auto lock mode).

[0011]

[0012] In this way, and if you do not need the switching of the lock state and the unlock state by the lock input means in the man lock mode, for easy to forget set by the lock input means of the lock state in the manual lock mode operator, By setting the auto lock mode by instructing the setting of the auto lock with the auto lock input means, the lock state can be automatically set when the key switch is turned off as in the related art.

(2) To achieve the above object,
The present invention provides a key switch for controlling start and stop of an internal combustion engine.
Switch, code input means, and the key switch are turned on.
And a predetermined code is input to the code input means.
An unlocking electronic device for generating an unlocking signal;
When a signal is occurring, the operation of the hydraulic machine is
If the unlock signal is not generated, the operation of the hydraulic
The anti-theft device for hydraulic machines equipped with a locking means
The lock state is set by the operator's operation.
Further comprising lock input means for instructing
When the key switch is turned off, the device
When the lock input means is instructing to set the lock state
Set the lock status and shut down the unlocking electronic device.
The lock input means instructs the setting of the lock state.
If not, set the unlocked state and unlock the electronic device.
First unlock control means for shutting down the system, and the lock
When the status is set, the key switch is turned ON.
And that a predetermined code is input to the code input means.
The unlock signal is generated and the unlock state is set.
When the key switch is turned ON, the unlock signal
And a second unlocking control means for generating said first unlocking control means, after OFF of the key switch, set the lock state when the lock input means instructs setting of the lock state within a predetermined time If the lock input means does not instruct the setting of the locked state within a predetermined time, the unlocked state is set and the system is down. Thus, as described in (1) above, the hydraulic machine
During a normal stop, the lock input means
The unlocking electronic device is locked and the system is
If you don't know the code,
Can be moved, preventing theft. Also hydraulic
Temporarily outside the vehicle due to the frequent repetition of starting and stopping the machine
Use the lock input device when working with
System down without instructing
You can resume rolling.

(3) To achieve the above object,
The present invention provides a key switch for controlling start and stop of an internal combustion engine.
Switch, code input means, and the key switch are turned on.
And a predetermined code is input to the code input means.
An unlocking electronic device for generating an unlocking signal;
When a signal is occurring, the operation of the hydraulic machine is
If the unlock signal is not generated, the operation of the hydraulic
The anti-theft device for hydraulic machines equipped with a locking means
The lock state is set by the operator's operation.
Further comprising lock input means for instructing
When the key switch is turned off, the device
When the lock input means is instructing to set the lock state
Set the lock status and shut down the unlocking electronic device.
The lock input means instructs the setting of the lock state.
If not, set the unlocked state and unlock the electronic device.
First unlock control means for shutting down the system, and the lock
When the status is set, the key switch is turned ON.
And that a predetermined code is input to the code input means.
The unlock signal is generated and the unlock state is set.
When the key switch is turned ON, the unlock signal
And the second unlock control means generates a lock state when the lock input means instructs to set the lock state before the key switch is turned off. If the lock input means does not instruct the setting of the lock state, the unlock state is set and the system goes down. This allows
As described in (1), when the hydraulic machine is normally stopped,
The lock status can be set by using the lock input
The lock electronic device goes down in the locked state and
For those who do not know the code, the hydraulic machine cannot be moved to prevent theft.
Can be stopped. Frequent operation and stoppage of hydraulic machines
Temporarily outside the vehicle due to frequently repeated work or short breaks
During breaks, instruct the lock input means to set the lock state.
System can be shut down and operation can be resumed easily.

(4) Any one of the above (1) to (3)
In addition, preferably, the lock input means is a momentary actuation of the switch to be ON only while the operator is pressing.

(5) Further, in the above (1) , preferably, the auto-lock input means is an alternate switch for maintaining a state after switching.

(6) Any one of the above (1) to (3)
In the above, the hydraulic machine includes a start system of an internal combustion engine including a starter, a key switch start relay, and a battery, and the lock unit is provided at, for example, at least one position in a start system of the internal combustion engine.

[0018]

[0019]

(7) Further, any of the above (1) to (3)
In addition, preferably, the code input means is a radio receiver for receiving the predetermined code by radio from a wireless transmitter.

By using the radio receiver as the code input means in this way, it is not necessary to provide the code input means on the surface inside the cab as in the case of a ten-key input device, but it can be installed in the shade, and the existence of the antitheft device itself can be hidden. .

(8) In the above (7) , preferably,
The wireless transmitter stores the predetermined code,
It is assumed that the predetermined code is wirelessly transmitted to the wireless receiver by an operation of the operator.

This is convenient because the operator need only carry the transmitter storing the password without having to remember the password.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, an engine 100 drives a main hydraulic pump and a pilot hydraulic pump of a hydraulic system (not shown).
An engine start system 101 including a key switch start relay 103 and a battery 104 is provided.
Is turned on, the starter 102 is turned, and the engine 100 starts.

Reference numeral 20 denotes an anti-theft device of the present embodiment provided in the engine starting system 101.
Is a key input device 21 and an auto lock switch 13
And the unlocking electronic device 2 to which signals are sent from the key switch 105, the key input device 21, and the auto lock switch 13.
2 and a starter control relay 11 as locking means connected between the starter 102 of the engine start system 101 and the key switch start relay 103.

The auto lock switch 13 is an alternate switch (a switch for holding the state after the switching) which is selectively turned ON / OFF by the operation of the operator. The key input device 21 includes numeric keys 21a from 0 to 9 and a key (hereinafter referred to as a lock button) 21b as a lock button that is selectively turned ON / OFF by an operator's operation. It is sent to the lock electronic device 22.
The numeric keypad 21a and the lock button 21b are momentary operation switches that are turned ON only while the operator presses them.

The starter control relay 11 is an unlocking electronic device 2
The power of the battery 104 is guided to the starter 102 only when both the key switch start relay 103 and the starter control relay 11 are turned on.

Here, the key input device 21 and the unlocking electronic device 22 receiving the signal are installed at a place where the operator can operate and access the key input device 21.

FIG. 2 is a circuit diagram showing the structure of the unlocking electronic device 22. As shown in FIG. 2, the unlocking electronic device 22 includes a power supply circuit 22a connected to the battery 104, and a CPU 22b that inputs signals from the key switch 105, the numeric keypad 21a, the lock button 21b, and the auto lock switch 13.
The power transistor 22c, which is turned ON / OFF by the CPU 22b to electrically control the operation of the starter control relay 11, and the power supply circuit 22a only when both the key switch 105 and the signal from the CPU 22b are turned OFF.
Circuit 22d for turning OFF the power supply and the O
The state of a lock flag (described later) is stored at the time of FF.
And an EROM 22e.

Next, the operation of this embodiment will be described with reference to FIGS. FIGS. 3 and 4 show the processing functions of the CPU 22b in a flowchart.

First, the state in which the hydraulic machine is moving will be described.

The operator turns off the key switch 105.
When the engine 100 is stopped by turning off an electric system for engine control (not shown), the key switch OF
The F (key-off) signal is transmitted to the CPU 22 of the unlocking electronic device 22.
b (procedure 100). At this time, the unlocking electronic device 2
Key switch 1 which is one input of the OR circuit 22d
Although the signal from 05 is turned off, the signal from the CPU 22b is kept on and the power supply circuit 22a is not turned off.
Then, the CPU 22b checks the state of the auto lock switch 13 (procedure 101). If the auto lock switch 13 is on, turns on a lock flag (procedure 103), and then turns off the signal sent to the OR circuit 22d to turn off the power supply circuit. 22a is turned off, and the system of the unlocking electronic device 22 is stopped (system down) (procedure 105).
At this time, the power transistor 22c is also turned off, and the starter control relay 11 is turned off. On the other hand, the state of the lock flag is stored in the EEPROM 22e of the unlocking electronic device 22, and is retained even after the system goes down.

Next, in step 101, when the state of the auto lock switch 13 is checked,
Is OFF, the CPU 22b checks ON / OFF of the lock button 21b (procedure 102). If the lock button 21b is pressed within a certain time after the key is turned off, the CPU 22b sets the lock flag ON (procedure 103). System goes down. On the other hand, the lock button 21
If b is not pressed, the lock flag is turned off (step 104) and the system is shut down.

Next, the operation when the operator attempts to restart the hydraulic machine will be described.

When the operator turns on the key switch 105, a key switch-on (key-on) signal is sent to the CPU 22b of the unlocking electronic device 22 at the same time as an engine control electric system (not shown) is turned on (step 110). At this time, the signal from the key switch 105 which is one input of the OR circuit 22d of the unlocking electronic device 22 is turned on, and the power supply circuit 22a is turned on. And the CPU 22
b reads the state of the lock flag stored in the EEPROM 22e and checks the state of the lock flag (step 11).
1) If the lock flag is OFF, the lock is unlocked immediately (step 113). That is, the power transistor 22c is
N, and turns on the starter control relay 11 (procedure 11
3). As a result, when the key switch 105 is further turned and the start relay 103 is turned on, the start relay 103 is turned on.
Since both the starter control relay 11 and the starter control relay 11 are turned on, the starter 102 rotates and the engine 100 starts.

On the other hand, if the lock flag is ON when the state of the lock flag is checked, the numeric keypad 21a
When a password is input from the numeric keypad 21a, the CPU 22b collates the input number with the password stored in the CPU internal memory (step 112). Only when is the same unlocking operation as above is performed.

In the above, the CPU of the unlocking electronic device 22
Procedures 100, 102, 103, and 10 shown in FIG.
The functions of the keys 4 and 105 are as follows: when the key switch 105 is turned off, when the lock button 21b is on, the lock state is set and the unlocking electronic device 22 is brought down, and when the lock button 21b is off, the lock is unlocked. A first unlocking control means for setting a state and bringing down the unlocking electronic device 22 is constituted, and the CPU 22b of the unlocking electronic device 22
The functions of steps 111, 112, and 113 shown in FIG. 4 are such that when the locked state is set, the key switch 105 is turned off.
Generates a result and unlocking signal can with a predetermined security code to the key input unit 21 (predetermined code) is input to N, the key switch 1 when the unlocked state is set
The second unlocking control means generates an unlocking signal only by turning on the switch 05.

The function of the procedure 101 shown in FIG. 3 of the CPU 22b of the unlocking electronic device 22 is such that when the key switch 105 is turned off while the auto lock switch 13 is turned off, the first unlock control means locks the key. When the key switch 105 is turned off while the auto lock switch 13 is ON, the lock state is set and the unlock electronic device 22 is set to the system state. A third unlock control means for lowering the pressure is constituted.

In this embodiment configured as described above, when using the machine at a work site where the operation and stop of the hydraulic machine are frequently repeated, the operator turns off the auto lock switch 13 and sets the machine in the manual lock mode. . Then, when the hydraulic machine is stopped, the operator turns off the key switch 105, and then presses (turns on) the lock button 21b within a certain period of time, the system shuts down in a locked state. input code the key switch 105 with respect turned ON conventional PIN to enable the operation of the hydraulic machine can and matches.

When working outside the vehicle temporarily or during a short break, the operator must turn off the key switch 105 but do not press the lock button 21b without turning it on.
The system is shut down in the unlocked state, and when the hydraulic machine is subsequently started, the operation of the hydraulic machine is enabled only by turning on the key switch 105.

Therefore, when a normal hydraulic machine is stopped,
If the lock button 21b is pressed, the system shuts down in the locked state as before, the hydraulic machine cannot be started for those who do not know the password, and theft can be prevented. When working outside the vehicle temporarily or during a short break during work in which the operation and stop of the hydraulic machine are frequently repeated, the system can be shut down in the unlocked state without depressing the lock button 21b, and the operation can be resumed easily.

In the case where it is not necessary to switch between the locked state and the unlocked state by the lock button 21b in the manual lock mode, or for an operator who easily forgets to set the locked state by the lock button 21b in the manual lock mode, the automatic locking is performed. Switch 13 ON
By setting the auto lock mode to
As in the conventional case, the system can be automatically shut down in the locked state by turning off the key switch 105, and the person who does not know the personal identification number cannot start the hydraulic machine, thereby preventing theft.

Further, since the lock flag for setting the lock state is stored in the EEPROM 22e of the unlocking electronic device 22, the lock can be locked no matter how much the thief manipulates the automatic lock switch 13 in front of the locked machine. Release has no effect. Therefore, the safety of the anti-theft device itself is not affected at all, and only the convenience can be improved.

As described above, according to the present embodiment, the operation can be easily resumed in the work in which the operation and the stop of the hydraulic machine are frequently repeated without impairing the ability to prevent theft.

An auto-lock mode in which the key switch is immediately locked when the key switch is turned off, and a key switch OF
Since the manual lock mode in which the lock state is set only when the lock button is pressed at the time of F is switched, the convenience in use is significantly improved.

A second embodiment of the present invention will be described with reference to FIGS. 1, 2 and 5. In the above embodiment, the lock button 21b is turned on and the lock state is set after the key switch 105 is turned off. However, in the present embodiment, the lock button 21b is turned on and the lock state is set before the key switch 105 is turned off.

That is, in FIGS. 1, 2 and 5,
The hydraulic machine is running and the operator
When neither the key b nor the key switch 105 is operated, the CPU 22b of the unlocking electronic device 22 sets the lock button 21b to the O position.
After confirming that it is FF, the lock flag is turned off (procedures 200 to 202), and the key switch 105 is turned off.
Repeat the operation of confirming that it is FF (step 20
3).

When the hydraulic machine is stopped, the operator turns off the key switch 105 and the key switch start relay 1
When the starter 102 is stopped by turning OFF the switch 03 and the engine 100 is stopped, the CPU 22b turns off the lock button 21b before checking the state of the key switch 105.
Check N.OFF (procedure 201), lock button 21b
If is not pressed, the lock flag is turned off (steps 202 and 205), the state of the key switch 105 is checked, and then the state of the auto lock switch 13 is checked (step 20).
6) If the auto lock switch 13 is ON, the lock flag is turned ON (procedure 207), and then the power supply circuit 14a
Is turned off, and the entire system is stopped (system down) (step 208). Also, when the auto lock switch 13 is
If it is FF, the system is shut down as it is, that is, while the lock flag is OFF (steps 206 and 208).

On the other hand, if the lock button 21b is ON when the state of the lock button 21b is checked, and if the key switch 105 is turned off within a predetermined time after the lock button is turned on, the CPU 22b operates in the same manner as described above. 1
After checking the state of 05, the state of the auto lock switch 13 is checked (step 206). If the auto lock switch 13 is on, the lock flag is turned on and the system is shut down (steps 207, 208). If the auto lock switch 13 is OFF, the system goes down with the lock flag ON (steps 206 and 208).

On the other hand, if the key switch 105 is not turned off within a predetermined time after the lock button is turned on, the lock flag is turned off and the above operation is performed. That is, the state of the auto lock switch 13 is checked (step 206), and if the auto lock switch 13 is ON, the lock flag is set to O.
N and shut down (procedures 207 and 208). If the auto lock switch 13 is OFF, the lock flag O
System down with FF (procedures 206 and 20)
8).

The processing of the CPU 22b when starting the hydraulic machine is the same as in the first embodiment shown in FIG.

According to the present embodiment, the key switch 10
By pressing the lock button 21b before turning off the lock 5, the lock state can be set in the manual lock mode, and the same effect as in the first embodiment can be obtained.

A third embodiment of the present invention will be described with reference to FIGS. In the above embodiment, the locking means of the anti-theft device is provided in the engine starting system, but in the present embodiment, the locking means is provided in the hydraulic system of the hydraulic machine. In the figure, the same reference numerals are given to members equivalent to the members shown in FIG.

In FIG. 6, the hydraulic machine includes a pilot hydraulic pump 1 for producing a primary pilot pressure, an pilot relief pump 2 connected to a discharge line of the pilot hydraulic pump 1 for keeping the primary pilot pressure constant, and a pilot hydraulic pump 1. And a valve operation circuit 30 for driving the main control valve 6 by using the pilot primary pressure generated by the controller. The valve operation circuit 30 is connected to the pilot primary pressure pipes 3 and 3a for transmitting the pilot primary pressure generated by the pilot hydraulic pump 1 and the pilot primary pressure pipe 3a,
A pilot valve device 4 for converting the pilot primary pressure into a pilot secondary pressure, and pilot secondary pressure pipes 5a, 5c; 5b, 5d connected to the pilot valve device 4 and transmitting the pilot secondary pressure to the main control valve 6. It is configured. Also,
The main control valve 6 is located between the main hydraulic pump 7 and the hydraulic cylinder 8, and the flow of the pressure oil supplied from the main hydraulic pump 7 to the hydraulic cylinder 8 is switched by the main control valve 6. A main relief valve 9 that regulates the maximum pressure of the main hydraulic pump 7 is connected to the hydraulic oil supply line 7 a of the main hydraulic pump 7.

The pilot valve device 4 includes a pair of pressure reducing valves 4a,
4b and a manual lever 4c for operating the pair of pressure reducing valves 4a and 4b, and the main control valve 6 is a hydraulic drive unit 6 connected to the pilot secondary pressure pipes 5a and 5c; 5b and 5d.
a, 6b, and a spool 6c driven by the hydraulic drive units 6a, 6b to switch an oil passage between the main hydraulic pump 7 and the hydraulic cylinder 8.

The pilot primary pressure generated by the pilot hydraulic pump 1 and kept constant by the pilot relief valve 2 is guided to the pressure reducing valves 4a and 4b via the pilot primary pressure pipes 3 and 3a, and the operator operates the manual lever 4c. For example, when it is tilted in the direction A in the figure, the pressure reducing valve 4a is operated, and the pilot secondary pressure according to the operation amount of the manual lever 4c is guided to the hydraulic drive unit 6a via the pilot secondary pressure pipes 5a and 5c. The spool 6c of the valve 6 moves in the direction C shown. Due to the movement of the spool 6c, the hydraulic oil from the main hydraulic pump 7 is guided to the bottom side of the hydraulic cylinder 8, the cylinder rod is extended, and a work machine (described later) attached to the cylinder rod is moved to operate the hydraulic machine. . When the manual lever 4c is inverted in the direction B, the pressure reducing valve 4
b operates, pilot secondary pressure according to the operation amount of the manual lever 4c is guided to the hydraulic drive unit 6b via the pilot secondary pressure pipes 5b and 5d, and the spool 6c of the main control valve 6 moves in the direction D in the figure. The hydraulic oil from the main hydraulic pump 7 moves and is guided to the rod side of the hydraulic cylinder 8, the cylinder rod is retracted, and the working machine attached to the cylinder rod is moved in the opposite direction to operate the hydraulic machine. I do.

FIG. 7 shows the entire hydraulic system. 7, the hydraulic machine includes a hydraulic system including a main hydraulic circuit 162 and a pilot hydraulic circuit 163.

The main hydraulic circuit 162 includes the main hydraulic pump 7 driven by the engine 100 and the engine 100.
And a plurality of actuators 8, 150 to 154 including the above-described hydraulic cylinder 8 driven by hydraulic oil discharged from the main hydraulic pumps 7, 107, and a main hydraulic pump 107. 7, the main control valve 6, which controls the flow rate of the pressure oil supplied to the plurality of actuators 8, 150, 152, 153, respectively.
A plurality of actuators 8, 150, 1 are provided from the main control valves 55 to 57, the spare main control valve 58, and the main hydraulic pump 107.
Main control valves 106, 155, 160, and 161 for controlling the flow rates of the pressure oil supplied to the oil supply 51, 154, respectively. 109 is a main relief valve of the main hydraulic pump 107, and 107a is a pressure oil supply pipe of the main hydraulic pump 107.

The pilot hydraulic circuit 163 is connected to the engine 1
00 is driven by the above-mentioned pilot hydraulic pump 1
Similarly, the pilot relief valve 2 and the valve operating circuit 30 for driving and operating the main control valves 6 and 106 of the main hydraulic circuit 162 using the pilot primary pressure generated by the pilot hydraulic pump 1 Using the pilot primary pressure generated by the hydraulic pump 1, the main control valves 55, 155; 56; 57;
0; valve operating circuits 31 to 35 for driving and operating 161.

The structure of the valve operating circuits 31 to 35 is substantially the same as that of the valve operating circuit 30, and includes pilot valve devices 36 to 40 similar to the pilot valve device 4, respectively.

The connection between each pilot valve device and the main control valve is represented by a, b; c, d; e, f; g, h; i, j;
The pilot valve device 4 is connected to the main control valve 106 as well as the main control valve 106 via pilot secondary pressure pipes 5a, 5e; 5b, 5f. With the operation described above, the pressure oils from the main hydraulic pumps 7 and 107 are combined and supplied to the actuator 8. Similarly, the pilot valve device 36 is also connected to the main control valves 55 and 155, and the main hydraulic pumps 7 and 1 are operated by operating the pilot valve device 36.
07 are combined and supplied to the actuator 150.

FIG. 8 shows the appearance of the hydraulic machine. In the present embodiment, the hydraulic machine is a hydraulic shovel, and the hydraulic shovel has a lower traveling structure 200, an upper revolving structure 201, and a front 202 as a working machine, and the front 202 is connected to a boom 203 that is vertically movable. It comprises an arm 204 and a bucket 205. The lower traveling body 200 has left and right crawlers 206 (only one is shown) driven by the above-mentioned actuators (traveling motors) 153 and 154.
2 (swing motor) is built in, and drives the upper swing body 201 to swing with respect to the lower traveling body 200. Also, boom 20
3, the arm 204 and the bucket 205 are driven vertically by the actuator (boom cylinder) 8, actuator (arm cylinder) 150, and actuator (bucket cylinder) 151, respectively.

Returning to FIG. 6, the above-described hydraulic machine is provided with the anti-theft device 20A of this embodiment.

The anti-theft device 20A includes the key input device 21, the unlocking electronic device 22, the auto lock switch 13
And among the pilot primary pressure pipes 3 and 3 a between the pilot hydraulic pump 1 and the pilot valve device 4, the pilot primary pressure pipes 3 and 3 a are installed in the pilot primary pressure pipe 3 that is a pipe common to the plurality of valve operation circuits 30 to 35. And a solenoid valve 23 as locking means.

The solenoid valve 23 is connected to the unlocking electronic device 22.
And a spool 23b driven by the solenoid driving unit 23a. The unlocking signal (ON electric signal) from the unlocking electronic device 22 is not generated. At this time, the spool 23b is kept in the illustrated closed position by the force of the spring 23c, and when an unlocking signal is given from the unlocking electronic device 22, that is, when the electric signal is turned on, the solenoid driving unit 23a operates to cause the illustrated closed position. To the open position.

The configuration and processing functions of the unlocking electronic device 22 are as follows.
This is the same as that of the first embodiment except that the output destination of the power transistor 22c (see FIG. 2) is the solenoid drive unit 23a of the solenoid valve 23.

The basic operation of the antitheft device of the present embodiment configured as described above is the same as that of the first embodiment. That is, the operator turns off the auto lock switch 13 and in the manual lock mode, the operator operates the key switch 10.
5 is turned off, and then the lock button 21b
And a press (for ON), and the system down in the lock state unlocking electronic device 22, at the start of the subsequent hydraulic machine, when the operator input code matches against the key switch 105 ON Then conventional PIN , The unlocking electronic device 22 is a solenoid driving portion 23 a of the solenoid valve 23.
To output an unlock signal (ON electric signal). If the operator turns off the key switch 105 but does not press the lock button 21b (does not turn it on), the unlocking electronic device 22 is unlocked and the system goes down. When the hydraulic machine is subsequently started, the key switch 105 is turned off. The unlocking electronic device 22 outputs an unlocking signal (ON electrical signal) to the solenoid drive unit 23a of the solenoid valve 23 only by turning ON the switch.

In the present embodiment, when the unlocking electronic device 22 outputs an unlocking signal (ON electrical signal), the solenoid driving portion 23a of the solenoid valve 23 is energized and the spool 23b of the solenoid valve 23 is opened. Position to make the pilot primary pressure pipe 3 conductive. Therefore, the pilot primary pressure from the pilot hydraulic pump 1 is not shut off, and the manual lever 4c of the pilot valve device 4 is
Is operated, the pilot secondary pressure is generated as described above, the main control valve 6 is moved, and pressurized oil is supplied from the main hydraulic pump 7 to the boom cylinder 8. At the same time, the main control valve 106 shown in FIG. 7 is also operated, and pressurized oil is supplied from the main hydraulic pump 107 to the boom cylinder 8. Thereby, the boom cylinder 8 is driven, and the boom 203 can be moved.

The other pilot valve devices 36 to 4 shown in FIG.
0, the corresponding actuator 1
50 to 154 are driven, the arm 204, the bucket 20
5 and other work implement elements can be moved.

Conversely, when the unlocking electronic device 22 does not output the unlocking signal, the solenoid valve 23 shuts off the pilot primary pressure pipe 3. Therefore, the pilot primary pressure from the pilot hydraulic pump 1 is shut off, and even if the manual lever 4c of the pilot valve device 4 is operated, no pilot secondary pressure is generated, and the main control valves 6, 106 do not move. For this reason,
The boom cylinder 8 is not driven, and the boom 203 cannot be moved. Similarly, even when operating another pilot valve device, for example, the pilot valve devices 39 and 40 for traveling, the traveling motors 153 and 154 are not driven, and the crawler 206 of the lower traveling body 200 cannot be moved.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained since the installation location of the lock means is a hydraulic system.

Most construction machines such as hydraulic excavators use a diesel engine. In a diesel engine, once the starter is turned, the governor inhales fuel and continues to run by self-ignition. For this reason, when the locking means is provided in the engine starting system as in the previous embodiment, even if the engine starting system is shut off, the external battery is directly connected to the motor terminal of the starter, and the starter is turned. When you start
The engine keeps running and the machine can be stolen. In addition, a configuration in which the engine fuel system is shut down is conceivable, but in this case, there is a possibility of fuel leakage, and sufficient safety measures are required. Further, when either the engine starting system or the fuel system is shut off, additional components are installed around the engine. However, since the space around the engine is narrow, there is a demand that additional components should be avoided. Further, in a narrow space around the engine, it is difficult to secure an appropriate installation location that is difficult for a thief to find.

In this embodiment, since the solenoid valve 23 as a locking means is installed in the hydraulic system and shuts off, there is no need to take safety measures against fuel leakage.
Also, since the solenoid valve 23 is a small part and may be provided at any suitable place in the pilot primary pressure pipe 3 which exists on the actual machine along a long route, it is easy to install the solenoid valve at a place where a thief discovers and hates. Can be. Further, since the pressure of the pilot hydraulic circuit is as low as, for example, about 10 kg / cm ² and the diameter of the pilot primary pressure pipe 3 is small, the solenoid valve 23 can be easily installed.

In the present embodiment, the unlocking electronic device 22
The unlocking signal generated from the
When no electric signal is generated, the solenoid valve 2
3 cuts off the pilot primary pressure pipe 3 so that even if a thief notices the existence of the anti-theft device 20A and destroys the components such as the key input device 21 and the unlocking electronic device 22 that are easily understood, Since the pilot primary pressure pipe 3 remains shut off, the hydraulic machine cannot be moved and theft can be prevented.

The fourth and fifth embodiments of the present invention will be described with reference to FIGS. 9 and 10. These embodiments will be described with reference to representative drawings of variations of the third embodiment.

First, general variations of the third embodiment will be described.

In the third embodiment, the lock means is installed on the pilot primary pressure pipe 3 of the hydraulic system. However, the lock system is made inoperable, and any other location can be used as long as the hydraulic system can be prevented from moving. There may be. The following is an example of installing the locking means at another location of the hydraulic system.

(1) Lock means is provided on the pilot secondary pressure side of the valve operation circuit (described later).

(2) Lock means is provided in a portion other than the valve operation circuit of the pilot hydraulic circuit.

(2-1) For example, the main hydraulic pump 7 (FIG. 7)
In the case of the variable displacement type in which the displacement is controlled by a hydraulic signal, a lock means is provided in the transmission pipe for the hydraulic signal so that the pump and the output flow rate do not increase when there is no unlock signal.

(2-2) The pilot relief valve 2
Alternatively, the setting of the relief pressure of the main relief valve 9 (see FIG. 7) is made variable by a hydraulic signal, a lock is provided in the transmission pipe of the hydraulic signal, and when there is no unlocking signal, the setting of the relief pressure is 0 or a small value. So that the pilot pressure or the output pressure of the main pump does not rise.

(3) Lock means are installed not in the pilot hydraulic circuit but in the main hydraulic circuit (described later).

In the third embodiment, the pilot valve device for operating the actuator is a hydraulic pilot type in which the pressure reducing valve is operated by a manual lever. However, an electric signal is generated by the manual lever to operate the electromagnetic proportional pressure reducing valve. The electric lever type may be used.

Further, in the third embodiment, the normally closed solenoid valve is used as the lock means, and the pilot pressure is cut off to disable the hydraulic system. However, the normally open solenoid valve is used. Pilot pressure may be released to the tank to disable the hydraulic system.

The above (1) will be described as a fourth embodiment of the present invention with reference to FIG. In the drawings, members that are the same as those shown in FIGS. 1 and 6 are given the same reference numerals.

In FIG. 9, the anti-theft device 20b of this embodiment is installed in a common pilot secondary pressure pipe 5b between the pilot valve device 4, the main control valve 6, and the main control valve 106 (see FIG. 7). The solenoid valve 23B is provided. Other configurations are the same as those of the third embodiment.

In the antitheft device of the present embodiment configured as described above, the unlocking electronic device 22 sends the unlocking signal (ON
Output of the solenoid valve 2)
The solenoid drive unit 23a of 3B is energized to move the spool 23b of the solenoid valve 23B to the open position, and the pilot secondary pressure pipe 5b is brought into a conductive state. Therefore, the pilot secondary pressure from the pilot valve device 4 is not shut off, and when the manual lever 4c of the pilot valve device 4 is operated in the direction B, the pilot secondary pressure is reduced by the hydraulic drive unit 6 of the main control valve 6.
b, the main control valve 6 is operated, and the main hydraulic pump 7
Pressure oil is supplied to the bottom side of the boom cylinder 8 from the bottom.
At the same time, the main control valve 106 shown in FIG. 7 is also operated, and pressure oil is supplied from the main hydraulic pump 107 to the bottom side of the boom cylinder 8. Thereby, the boom cylinder 8 is driven in the extension direction, and the boom 203 can be moved upward.

Conversely, when the unlocking electronic device 22 does not generate an unlocking signal, the solenoid valve 23B shuts off the pilot secondary pressure pipe 5b. Therefore, the pilot secondary pressure from the pilot valve device 4 is shut off, and even if the manual lever 4c of the pilot valve device 4 is operated in the B direction, the main control valve 6 and the main control valve 106 (see FIG. 7) do not move. . For this reason, the boom cylinder 8 is not driven in the extension direction, and the boom 203 cannot be moved upward.
Can be kept in contact with the bucket 205 as shown in FIG. 8 to prevent the movement of the hydraulic machine.

As described above, even if the pilot secondary pressure is cut off, the hydraulic machine cannot be moved unless the unlocking electronic device 22 outputs an unlocking signal, and theft can be prevented.

Therefore, according to the present embodiment, the same effect as that of the third embodiment can be obtained.

In this embodiment, the pilot secondary pressure on the boom raising side of the boom valve operation circuit 30 is shut off, but at least one of at least one of the traveling valve operation circuits 34 and 35 (see FIG. 7). The pilot secondary pressure on the forward side may be shut off, in which case the unlocking electronic device 22
Cannot output the unlock signal, the hydraulic machine cannot be moved, and theft can be prevented. Further, although the anti-theft capability is inferior, lock means may be provided in the valve operation circuit of the arm or bucket.

Whether to cut off the pilot primary pressure or the pilot secondary pressure is determined by the pilot primary pressure pipe 3 and the pilot secondary pressure pipe 5a,
The preferred configuration may be adopted for layout reasons such as which of 5b is easier to install the solenoid valve or which is installed in a place where it is difficult for a thief to find.

Further, in this embodiment, as an example of the locking means provided on the pilot secondary pressure side, the pilot secondary pressure pipe 5
Although the solenoid valve 23B that shuts off the valve b is shown, a valve communicating the two pilot secondary pressure pipes 5a and 5b may be used.

The above (3) will be described as a fifth embodiment of the present invention with reference to FIG. In the drawings, members that are the same as those shown in FIGS. 1 and 6 are given the same reference numerals.

In FIG. 10, the anti-theft device 20C of the present embodiment has a solenoid valve 23C installed in the hydraulic oil supply line 7a of the main hydraulic pump 7. Other configurations are the same as those of the third embodiment.

In the anti-theft device of the present embodiment configured as described above, when the unlocking signal is not generated from the unlocking electronic device 22, the solenoid valve 23C is in the closed position shown in FIG. Since the road 7a is blocked, even if the pilot valve device 39 is operated, for example,
3 does not work. Therefore, the theft of the hydraulic machine can be prevented.

On the other hand, when an unlocking signal is generated from the unlocking electronic device 22, the solenoid valve 23C opens,
The pressure oil discharged from the main hydraulic pump 7 can be supplied to each actuator as usual, and for example, the traveling motor 153 can be operated by the pilot valve device 39.

Therefore, according to the present embodiment, the same effect as that of the third embodiment can be obtained.

In the present embodiment, the solenoid valve 23C is installed directly on the pressure oil supply line 7a. However, the solenoid valve is used as an electro-hydraulic conversion valve, and the pressure oil supply line 7a is used.
A pilot operated valve that can be switched by the output pilot pressure of the electro-hydraulic conversion valve may be installed at a. Thereby, the pressure oil supply line 7 through which the high-pressure, large-flow pressure oil flows
a can be easily cut off and communication can be switched.

The sixth embodiment of the present invention will be described with reference to FIG. This embodiment shows an example of a code input unit other than the key input device. In the drawings, members that are the same as those shown in FIGS. 1 and 6 are given the same reference numerals.

In FIG. 11, the anti-theft device 20D of the present embodiment has a radio receiver 80 and a radio transmitter 81 that transmits a password and a lock button 21b signal to the radio receiver 80 wirelessly. When a password or a signal from the lock button 21b is wirelessly input to the receiver 80, the receiver 80
Transmits those signals to the unlocking electronics 22. The transmitter 81 stores a password, and when the operator presses one button 81a, the stored password is transmitted to the receiver 80 wirelessly. Other configurations are the same as those of the third embodiment.

In the anti-theft device of this embodiment configured as described above, the unlocking electronic device 22 and the solenoid valve 23 as the locking means are wirelessly operated by pressing the button 81a or the lock button 21b of the transmitter 81. And the first
The same effect as that of the embodiment can be obtained.

Further, in this embodiment, it is convenient for the operator to carry the transmitter 81 storing the password without having to remember the password. Further, unlike a key input device, it is not necessary to provide the anti-theft device on the surface inside the cab.
Therefore, the anti-theft capability can be further enhanced.

In the above-described embodiment, an example of a wireless system has been described as the code input means other than the key input device. However, the code input means is not limited to these.
Any type can be used as long as a predetermined code can be input. For example, a dial input method or a touch panel input method may be used instead of the key input method. Further, as the predetermined code, for example, a code consisting of one of the alphabets a to x or a combination thereof may be input instead of a password consisting of one of the numbers or a combination thereof.

In the above embodiment, the locking means is provided at one place of the engine starting system or the hydraulic system. However, the locking means is provided at one place at the engine starting system, at one place at the hydraulic system, or at two places at the hydraulic system. It may be provided at two or more locations, such as a location, so that even if a thief finds either one of the locking means, the remaining locking means can function and the anti-theft capability can be further improved. .

[0106]

According to the present invention, it is possible to easily restart the operation of the hydraulic machine in the case where the operation is frequently repeated without stopping the ability to prevent theft.

An auto-lock mode in which the key switch is immediately locked when the key switch is turned off, and a key switch OF
Since the manual lock mode, in which the lock state is set only when the lock input means instructs the setting of the lock state at the time of F, is switched, the convenience in use is remarkably improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a hydraulic machine including an anti-theft device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an internal configuration of an unlocking electronic device.

FIG. 3 is a flowchart showing a processing function when stopping the hydraulic machine of the unlocking electronic device.

FIG. 4 is a flowchart illustrating a processing function when starting the hydraulic machine of the unlocking electronic device.

FIG. 5 is a flowchart showing a processing function when stopping the hydraulic machine of the unlocking electronic device in the antitheft device according to the second embodiment of the present invention.

FIG. 6 is a system configuration diagram of a hydraulic machine including an anti-theft device according to a third embodiment of the present invention.

FIG. 7 is a diagram showing the entire hydraulic circuit shown in FIG. 6;

FIG. 8 is a diagram illustrating a hydraulic excavator that is a typical example of a hydraulic machine on which the anti-theft device is mounted.

FIG. 9 is a diagram illustrating a hydraulic circuit of a hydraulic machine including an anti-theft device according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a hydraulic circuit of a hydraulic machine provided with an anti-theft device according to a fifth embodiment of the present invention.

FIG. 11 is a diagram illustrating a hydraulic circuit of a hydraulic machine including an anti-theft device according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pilot hydraulic pump 3 Pilot primary pressure piping 4 Pilot valve device 5a, 5b Pilot secondary pressure piping 6 Main control valve 7 Main hydraulic pump 8 Hydraulic cylinder 11 Starter control relay 13 Auto lock switch 20 Anti-theft device 21 Key input device 21a Numeric keypad 21b Lock button 22 Unlocking electronic device 22a Power supply circuit 22b CPU 22c Power transistor 22d OR circuit 22e EEPROM 23 Solenoid valve 100 Engine 101 Engine start system 102 Starter 103 Key switch Start relay 104 Battery 105 Key switch

Continuation of the front page (72) Inventor Toichi Hirata 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (56) References JP-A-9-50584 (JP, A) (58) (Int.Cl. ⁷ , DB name) B60R 25/00-25/10

Claims (8)

(57) [Claims] 1. Keith for controlling start and stop of an internal combustion engine
Switch, code input means and key switch are ON
And a predetermined code is input to the code input means.
An unlocking electronic device for generating an unlocking signal when unlocked,
When the signal is generated, the operation of the hydraulic machine is enabled,
When the unlock signal is not generated, the operation of the hydraulic machine is
In the anti-theft device of hydraulic machine with lock means to disable
Specify whether to set the lock state by the operator's operation.
And Shimesuru lock input means, further comprising an automatic lock input means for instructing whether to set the automatic lock in operation of the operator, the unlocking electronic apparatus, when the key switch to OFF, the clock input
Locked when means instructs setting of locked state
Set the state and shut down the unlocking electronic device,
If the lock input means does not instruct the setting of the lock state
Set the unlock status to unlock the electronic device
First unlock control means for lowering, and the key switch when the locked state is set.
ON and a predetermined code is input to the code input means.
The unlock signal is generated when the unlock signal is
When the status is set, just turn on the key switch
A second unlock control means for generating an unlock signal; and the first unlock control means for locking when the key switch is turned off in a state where the auto lock input means does not instruct the setting of the auto lock. The state of the unlocking electronic device is set by setting a state or an unlocked state, and the lock state is always set when the key switch is turned off in a state where the automatic lock input means is instructing the setting of the automatic lock. And a third unlock control means for shutting down the unlocking electronic device. 2. Keith for controlling start and stop of an internal combustion engine
Switch, code input means and key switch are ON
And a predetermined code is input to the code input means.
An unlocking electronic device for generating an unlocking signal when unlocked,
When the signal is generated, the operation of the hydraulic machine is enabled,
When the unlock signal is not generated, the operation of the hydraulic machine is
In the anti-theft device of hydraulic machine with lock means to disable
Specify whether to set the lock state by the operator's operation.
The lock electronic device
Is the lock input when the key switch is turned off.
Locked when means instructs setting of locked state
Set the state and shut down the unlocking electronic device,
If the lock input means does not instruct the setting of the lock state
Set the unlock status to unlock the electronic device
First unlock control means for lowering, and the key switch when the locked state is set.
ON and a predetermined code is input to the code input means.
The unlock signal is generated when the unlock signal is
When the status is set, just turn on the key switch
And a second unlock control means for generating an unlock signal, wherein the first unlock control means comprises:
Thereafter, when the lock input means instructs the setting of the lock state within a predetermined time, the lock state is set and the system is shut down, and when the lock input means does not instruct the setting of the lock state within the predetermined time, the unlock state is set. An anti-theft device for a hydraulic machine, characterized in that the system is brought down by doing so. 3. Keith for controlling start and stop of an internal combustion engine
Switch, code input means and key switch are ON
And a predetermined code is input to the code input means.
An unlocking electronic device for generating an unlocking signal when unlocked,
When the signal is generated, the operation of the hydraulic machine is enabled,
When the unlock signal is not generated, the operation of the hydraulic machine is
In the anti-theft device of hydraulic machine with lock means to disable
Specify whether to set the lock state by the operator's operation.
The lock electronic device
Is the lock input when the key switch is turned off.
Locked when means instructs setting of locked state
And set the unlocking electronic device to system down, and
If the lock input means does not instruct the setting of the lock state
Set the unlock status to unlock the electronic device
First unlock control means for lowering, and the key switch when the locked state is set.
ON and a predetermined code is input to the code input means.
When unlocked, the unlock signal is generated.
When the status is set, just turn on the key switch
Second unlock control means for generating a lock signal, wherein the first unlock control means sets the lock state when the lock input means instructs to set the lock state before the key switch is turned off. The system is brought down, and if the lock input means does not instruct the setting of the locked state, the unlocked state is set and the system is brought down. 4. The anti-theft device for a hydraulic machine according to claim 1 , wherein the lock input means is a momentary-actuated switch which is turned on only while the operator presses the lock input means. Anti-theft device for hydraulic machines. 5. The anti-theft device for a hydraulic machine according to claim 1 , wherein said automatic lock input means is an alternate switch for maintaining a state after switching. 6. The anti-theft device for a hydraulic machine according to claim 1 , wherein the hydraulic machine includes a starter, a key switch start relay, a start system of an internal combustion engine including a battery, and the lock. The anti-theft device for a hydraulic machine, wherein the means is provided in at least one portion of a starting system of the internal combustion engine. 7. The anti-theft device for a hydraulic machine according to claim 1 , wherein the code input means is a wireless receiver for receiving the predetermined code wirelessly from a wireless transmitter. An anti-theft device for a hydraulic machine. 8. The anti-theft device for a hydraulic machine according to claim 7 , wherein the wireless transmitter stores the predetermined code, and the predetermined code is wirelessly transmitted to the wireless receiver by an operation of an operator. An anti-theft device for a hydraulic machine, which is transmitted.