JP3598982B2 - Anti-theft equipment for construction machinery - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-theft device for preventing construction machines such as hydraulic excavators and cranes from being stolen.
[0002]
[Prior art]
Crawler-type hydraulic shovels are often left at work sites during construction of plants and the like because of their small operating radius. If this type of construction machine is a rental / lease machine, the owner of the machine is not resident at the site, and thus the management is insufficient, and theft is frequently caused.
[0003]
Therefore, anti-theft devices are mounted on construction machines. For example, in an industrial machine with an anti-theft device disclosed in Japanese Patent Application Laid-Open No. 9-175329, a line connected in parallel from a power supply unit to each of the operating electric devices is once concentrated and led to the anti-theft device, and the theft is performed. When a four-digit password is input from a keyboard provided in the protection device, the password is determined by the password determination unit. If the verification results match, the power supply unit and each electric device are connected and turned on. ing.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional anti-theft device, all circuits leading to the respective electric devices are drawn into the anti-theft device, so that it is easily visible from the outside. , It is easy to see that the theft prevention can be released.
[0005]
In addition, this type of anti-theft device has a problem that a cost increase cannot be avoided because a dedicated anti-theft device is added to an existing circuit.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the conventional anti-theft device, and does not require a dedicated anti-theft device, and realizes anti-theft at low cost by using an existing circuit. It is an object of the present invention to provide an anti-theft device for construction equipment in which the anti-theft device has been incorporated, and it is not known from the outside that the anti-theft device has been incorporated.
[0007]
[Means for Solving the Problems]
According to the present invention, in a construction machine having a configuration including an operation control controller, the controller stores a switch operation procedure assigned to an existing operation switch, and the existing operation switch is operated. A collation unit for collating the procedure with the switch operation procedure stored in the storage unit, and enabling the operation of the construction machine only when the collation results by the collation unit match, and stopping the construction machine when they do not match An operation control unit and a period setting unit that sets a desired period, a construction machine antitheft device configured to determine that the matching result by the matching unit does not match for the set period. is there.
[0008]
In the present invention, the switch operation procedure stored in the storage unit indicates an operation procedure determined independently of the operation content originally operated by the switch.
[0009]
According to the present invention, if the procedure for operating the operation switch matches the preset operation procedure, the construction machine can be operated, and if not, the construction machine is stopped. Further, the controller is provided with a period setting unit for setting a desired period, and is configured to determine that the matching result by the matching unit does not match for the set period. For, verification of the operating procedure is rejected, and the fuel supply remains stopped in the following cases. The operation control unit can be configured to supply the fuel when the collation results match, and to stop supplying the fuel when the collation results do not match. According to this configuration, the operation switch is operated. If the procedure matches the preset operation procedure, fuel is sent to the engine and the engine can be started, but if it does not match, the fuel sent to the engine remains cut and the engine cannot be started. .
[0011]
In the present invention, it is preferable that the collation unit is configured to determine that the collation results match for a predetermined time after turning off the engine key. According to this configuration, if the predetermined time is set to one hour, for example, corresponding to a break time, when resuming the work within one hour, the trouble of operating the operation switch to perform the collation can be omitted.
[0012]
In the present invention, when the operation procedure of the operation switch does not match the switch operation procedure stored in the storage unit, a flow control unit that controls a pump flow supplied to the hydraulic actuator to a minimum flow is provided. Can be. According to this configuration, even if the engine can be started by any method, the theft can be prevented because the hydraulic actuator, for example, the traveling motor can be driven only at an extremely low speed.
[0013]
In addition, when the operation procedure of the operation switch and the switch operation procedure stored in the storage unit do not match with each other, a shutoff unit that shuts off an oil passage connecting the pilot pump and the remote control valve may be provided. According to this configuration, the operation of the hydraulic actuator can be completely locked.
[0014]
In the present invention, it is possible to include an alarm unit that issues an alarm when the operation procedure of the operation switch does not match the switch operation procedure stored in the storage unit.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.
[0016]
FIGS. 1 to 3 show a first embodiment of an anti-theft device according to the present invention, and show main parts of an engine starting circuit and a traveling motor drive circuit of a hydraulic shovel.
[0017]
In FIG. 1, when the key switch 1 is closed and the battery 2 and the battery relay 3 are connected, the electromagnetic coil R is excited and the contact R-1 is closed. Thus, power is supplied to the power supply unit 4a of the controller 4.
[0018]
When the key switch 1 is closed key switch-on signals S ₁ at the same time to the controller 4 is provided, the fuel supply control section 4b of the controller 4 receives the key switch-on signals S _1, a circuit switching unit 4f (described later) The stepping motor 5 is controlled via the motor, and the governor lever 6 connected to the stepping motor 5 is moved to supply fuel to the engine 7. Thus, the engine 7 can be started. The fuel supply control section 4b and the circuit opening / closing section 4f function as an operation control section.
[0019]
When the engine 7 starts, the variable displacement hydraulic pump 8 connected to the engine 7 rotates and the pilot pump 9 rotates.
[0020]
In this state, when the operator tilts the traveling lever 11a provided on the remote control valve 11 for operating the traveling motor 10, the pilot pressure is applied to the right control port of the direction control valve 12, and the direction control valve 12 is moved from the neutral position. Switch to position a. Thereby, the pressure oil from the hydraulic pump 8 is supplied to the traveling motor 10 through the position a, and the traveling motor 10 rotates in the forward direction.
[0021]
On the other hand, when the traveling lever 11a is tilted backward, it acts on the left control port of the direction control valve 12, and switches the direction control valve 12 from the neutral position to the position b. Thereby, the pressure oil from the hydraulic pump 8 is supplied to the traveling motor 10 through the position b, and the traveling motor 10 rotates in the reverse direction.
[0022]
Note that the operation of the traveling motor that drives the crawler on the other side of the lower traveling body is the same as described above, and a description thereof will be omitted. Reference numeral 13 in the figure is a relief valve.
[0023]
As shown in FIG. 2, a mode select switch (existing operation switch) 15 is provided on the operation panel surface 14a of the control box 14 arranged on the side of the driver's seat, and three operation modes are set. You can do it.
[0024]
The three work modes include an H mode 15a 'that enables heavy digging work with a crisp operation feeling, an S mode 15b' that is set to achieve both work amount and fuel efficiency, and emphasis on controllability. This is the FC mode 15c 'in which the work for the fine operation can be performed (see FIG. 3).
[0025]
The mode switches 15a, 15b, and 15c that can select each of these modes are connected to the fuel supply control unit 4b shown in FIG. 1, and control any one of the work modes by controlling the engine speed. Can be selected.
[0026]
The mode switches 15a to 15c are also connected in parallel to the matching unit 4d of the controller 4. That is, in the present invention, the mode select switches 15a to 15c originally used for selecting a work mode function as a password input means in the present invention, and a procedure in which the mode select switches 15a to 15c are pressed is referred to as an operation procedure. The switch is compared with a preset switch operation procedure stored in the storage unit (storage unit) 4e.
[0027]
The operation procedure storage unit 4e stores a switch operation procedure of operating the mode select switch 15 in the order of H → S → FC.
[0028]
Collating unit 4d is verification result supplied to the circuit switch portion 4f of the closing signal S ₂ when matching is connected to the fuel supply portion 4b and the stepping motor 5 is closed the contact of the circuit opening and closing portion 4f. If the collation results do not match, no signal is output, the contact of the circuit opening / closing section 4f remains open, and the control command given from the fuel supply section 4b to the stepping motor 5 is cut off.
[0029]
Next, a control operation of the circuit having the above configuration will be described.
[0030]
First, when the engine key switch 1 is turned on, the electromagnetic coil R of the battery relay 3 is excited, and the power is supplied to the power supply unit 4a of the controller 4 by closing the contact R-1.
[0031]
Next, the operator presses the mode select switch 15 in a predetermined operation order, in the order of H → S → FC. The pressed operation procedure is collated by the collation unit 4d with the switch operation procedure stored in the operation procedure storage unit 4e.
[0032]
Verification result is close signal S ₂ when is given to the circuit switch section 4f match closed contacts, thereby, the stepping motor 5 is operated on the basis of the fuel supply command output from the fuel supply control section 4b, and governor lever 6 Move and the engine 7 starts.
[0033]
On the other hand, when an outsider who does not know that the collation is performed using the mode select switch 15 attempts to start the engine 7, the starter motor is turned by turning the key switch 1 from "ON" to "START" (not shown). although it is possible to drive for a mode select switch 15 is not output closing signal S ₂ from the matching unit 4d to not operated in a predetermined operation procedure, since it remains the contacts of the circuit switching unit 4f is opened The fuel supply command is interrupted. Therefore, no fuel is supplied to the engine 7, and the engine cannot be started.
[0034]
Further, in the present invention, in configuring the anti-theft device, since the existing mode select switch 15 is used without providing the personal identification number input device which is a target of modification in the case of theft, the anti-theft device is provided. There is an advantage that the outsider cannot understand the fact that it is outside, and the antitheft cannot be easily released.
[0035]
In the above embodiment, the case where the present invention is applied to a configuration in which fuel supply to the engine 7 is controlled by the governor 7 has been described. However, the present invention is also applicable to a configuration in which fuel supply to the engine 7 is controlled using a solenoid. Can be applied. In this case, the solenoid can be excited or de-energized from the controller 4, and only when the operation procedure of the mode select switch 15 matches a predetermined switch operation procedure, the excitation to the solenoid is released and the fuel is released. What is necessary is just to supply.
[0036]
FIG. 4 shows a second embodiment of the anti-theft device according to the present invention.
[0037]
In the following description, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
[0038]
In this configuration, the power of the battery 2 is directly supplied to the controller 4, and the internal clock 4g and the timer setting unit (period setting unit) 4h connected to the internal clock 4g always operate.
[0039]
The timer setting unit 4h has two functions. First, the first function will be described.
[0040]
The timer setting portion 4h and the key switch signals _{S 1} described above is given, set switch 16a for performing a timer setting, UP switch 16b, DOWN switch 16c is connected. When the set switch 16a is pressed, the mode is switched to the timer setting mode. Then, when the UP or DOWN switch is pressed, the time displayed on the display section of the control box 14 is scrolled. When the set switch 16a is pressed once at the time when the desired time is displayed, the time at which the rejection of the collation acceptance by the mode select switch 15 is started is set. When the desired time is displayed, the set switch 16a is pressed twice. A time for canceling the rejection is set.
[0041]
For example, if the rejection start time is set to PM 8:00 and the rejection release time is set to AM 4:00, the contacts of the timer setting unit 4h remain open during the time period from PM 8:00 to AM 4:00, and the mode selection is performed. No matter how the switch 15 is operated, no collation is performed, and the anti-theft effect can be enhanced.
[0042]
The set switch 16a, the UP switch 16b, and the DOWN switch 16c can also be assigned to the existing switches provided on the operation panel of the control box 14, for example, the mode select switch 15. The switching between the mode selection and the timer setting may be performed by, for example, pressing the H, S, and FC switches 15a to 15c simultaneously for two seconds.
[0043]
Next, a second function of the timer setting unit 4h will be described.
[0044]
The second function is to enable the engine 7 to be started for a predetermined time after the key switch 1 is turned off without pressing the mode select switch 15.
[0045]
When the operator turns off the engine key 1 when temporarily leaving the construction machine for confirmation of excavation work, breaks, etc., every time the engine key is turned on, the mode select switch 15 must be input according to a predetermined operation procedure. , Operation becomes complicated.
[0046]
Therefore, the timer setting unit 4h counts the elapsed time after the switch is turned off each time the key switch 1 is turned off, and when the key switch 1 does not exceed a predetermined time, the contact of the circuit opening / closing unit 4f is held in a closed state by itself. It is configured.
[0047]
Then, even if the key switch 1 is turned off, if the period until the next time the key switch 1 is turned on is short, the collation using the mode select switch 15 can be omitted, and the operability is improved. .
[0048]
In the case where the first function and the second function are used together in the timer setting unit 4h, the timer setting unit 4h may be programmed to give priority to the rejection time zone.
[0049]
FIG. 5 shows a third embodiment of the anti-theft device according to the present invention.
[0050]
The configuration shown in FIG. 3 prevents the engine from being started when the operation procedure of the mode select switch 15 does not match the switch operation procedure stored in the operation procedure storage unit 4e, and allows the hydraulic actuator to operate normally. To make it impossible.
[0051]
In the following description, the travel motor 10 will be described as an example of a hydraulic actuator that cannot be operated. However, other hydraulic actuators such as an excavation attachment and a turning motor may be made inoperable.
[0052]
Reference numeral 17 denotes a regulator for adjusting the tilt angle of the variable displacement hydraulic pump 8. The regulator 17 is controlled by receiving a hydraulic signal supplied from an electromagnetic proportional valve 18, and the electromagnetic proportional valve 18 is controlled by a regulator control unit 4 i of the controller 4. Is controlled in response to a pump control signal from Note that the collating unit 4d and the regulator control unit 4i function as flow rate suppressing means.
[0053]
In a third embodiment, it leads to closing signal S ₂ output from the matching unit 4d to the regulator controller 4i, if the close signal S ₂ is not output to control the regulator 17 via the solenoid proportional valves 18 tilt angle Set to minimum. Thus, the amount of pressure oil discharged from the variable displacement hydraulic pump 8 is set to a minimum. Therefore, even if the engine 7 can be started, the hydraulic shovel can only run at an extremely low speed, so that theft can be prevented.
[0054]
FIG. 6 shows a fourth embodiment of the anti-theft device according to the present invention.
[0055]
In the configuration shown in FIG. 5, the engine cannot be started when the operation procedure of the mode select switch 15 does not match the switch operation procedure stored in the operation procedure storage unit 4e, and the hydraulic actuator can be completely operated. To make it impossible.
[0056]
Usually, a boarding / closing type lever is provided so as to block a driver's seat boarding passage in the cabin. When the lever is pulled, the contact of the limit switch 22 that operates in conjunction with the lever operation is opened, and the power supply to the solenoid of the pilot cut valve 21 is cut off. As a result, the pilot cut valve 21 is shut off, all hydraulic operations are locked, and malfunction due to body contact or the like is prevented.
[0057]
In the fourth embodiment, the traveling motor control unit 4j can control the signal itself supplied to the pilot cut valve 21 via the limit switch 22, and supplies or shuts off the signal.
[0058]
Specifically, lead to closing signal S ₂ output from the matching unit 4d to the travel motor control unit 4j, when closing signal S ₂ is not outputted, the contacts of the limit switch 22 regardless of the operation of the passenger shut-off lever Is forcibly opened to shut off a signal given to the solenoid of the pilot cut valve 21.
[0059]
As a result, even if the operation lever 11a is operated, the travel motor 10 cannot be driven because the pilot line is locked, and even if the engine 7 can be started, Since the operation of moving the vehicle forward or backward is locked, theft can be prevented. The collating unit 4d, the traveling motor control unit 4j, and the pilot cut valve 21 function as shut-off means.
[0060]
Further, in FIG. 1, when the collation result by the collation part 4d do not match, it is possible to configure the buzzer (alarm means) 23 receives the close signal S ₂ output from the matching unit 4d so as to sounding . According to this configuration, when an outsider randomly operates the mode select switch 15, the buzzer 23 remains ringing, and the outsider cannot be seated in the cabin by threatening the outsider.
[0061]
Further, in the above-described embodiment, the collation unit 4d can be configured such that if the number of times the switch is pressed by the mode select switch 15 exceeds a certain number of times, it is regarded as an outsider and collation is not performed. With such a configuration, it is possible to prevent a fraudulent act of applying an operation procedure by trial and error.
[0062]
In the present invention, the switch operation procedure stored in the operation procedure storage unit 4e is not limited to the above-described embodiment, and is an operation procedure including three or more procedures, for example, H → S → FC → S → H, or a procedure lower than that. , For example, H → S. If the number of procedures is increased, the anti-theft effect is enhanced, but on the other hand, the operation becomes troublesome. Therefore, it is preferable to determine the operation procedure in consideration of the balance between the anti-theft effect and the operability.
[0063]
In a construction machine not equipped with the mode select switch 15, another switch, for example, a buzzer stop switch can be used. In addition, the operation procedure does not necessarily need to press different types of switches, and the same type of switch may be pressed a predetermined number of times. It may be specified.
[0064]
【The invention's effect】
As is apparent from the above description, according to the first aspect of the present invention, an operation procedure using an existing switch (an operation procedure unrelated to an actual operation) is stored in the operation procedure storage unit in advance. Each time a switch is operated, it is compared with the operation procedure stored in the operation procedure storage unit, and operation is possible only when the result of the comparison is the same. Down can be planned. In addition, since it is not known that the anti-theft device is provided from the outside and the wiring cannot be modified or modified, it is possible to reliably prevent theft. In addition, the controller includes a period setting unit that sets a desired period, and is configured to stop the collation by the collating unit for the set period. By refusing, the anti-theft effect can be enhanced.
[0065]
According to the second aspect of the present invention, the fuel supply is performed when the collation results match, and the fuel supply is stopped when the collation results do not match. If the operating procedure matches, the fuel is sent to the engine and the engine can be started, but if it does not match, the fuel sent to the engine remains cut and the engine cannot be started.
[0067]
According to the third aspect of the present invention, the collating unit is configured to determine that the collation results match for a predetermined time after the engine key is turned off. When the engine key is turned on, the collation operation is omitted.
[0068]
According to the present invention of claim 4, when the matching between the switch operation procedure stored in the operation procedure and the storage section of the operation switch does not coincide, the flow rate suppression for controlling the pump flow rate supplied to the hydraulic actuator in minimum flow Since the means is provided, even if the engine can be started by any method, the hydraulic actuator, for example, the traveling motor can be driven only at a very low speed, and theft can be prevented.
[0069]
According to the fifth aspect of the present invention, when the collation between the operation procedure of the operation switch and the switch operation procedure stored in the storage unit does not match, the oil passage connecting the pilot pump and the remote control valve is shut off. With this configuration, the operation of the hydraulic actuator can be completely locked.
[0070]
According to the sixth aspect of the present invention, an alarm is issued when the collation between the operation procedure of the operation switch and the switch operation procedure stored in the storage unit does not match, so that an outsider can be repelled. it can.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a first embodiment of a construction machine antitheft device according to the present invention.
FIG. 2 is a perspective view showing an arrangement of a mode select switch shown in FIG.
FIG. 3 is an enlarged view of a mode select switch shown in FIG. 2;
FIG. 4 is a circuit diagram showing a second embodiment of the antitheft device for construction equipment according to the present invention.
FIG. 5 is a circuit diagram showing a third embodiment of the antitheft device for construction equipment according to the present invention.
FIG. 6 is a circuit diagram showing a fourth embodiment of the antitheft device for construction equipment according to the present invention.
[Explanation of symbols]
Reference Signs List 1 key switch 4 controller 4b fuel supply control unit 4d verification unit 4e operation procedure storage unit 4f circuit opening / closing unit 4g internal clock 4h timer setting unit 4i regulator control unit 4j traveling motor control unit 5 stepping motor 6 governor lever 7 engine 8 hydraulic pump 9 pilot Pump 10 Travel motor 11 Remote control valve 12 Direction control valve 14 Control box 15 Mode select switch 21 Pilot cut valve 23 Buzzer

Claims (6)

In a construction machine having a configuration for operation control,
The controller collates a storage unit storing a switch operation procedure assigned to an existing operation switch with a procedure in which the existing operation switch is operated and a switch operation procedure stored in the storage unit. A collation unit, comprising: an operation control unit that enables the operation of the construction machine only when the collation results by the collation unit match, and stops the construction machine when the collation results do not match, and a period setting unit that sets a desired period. An apparatus for preventing theft of a construction machine, wherein the apparatus is configured to judge that the collation result by the collation unit does not match for the set period . The anti-theft device for a construction machine according to claim 1, wherein the operation control unit is configured to supply the fuel when the verification results match, and to stop the fuel supply when the verification results do not match. The anti-theft device for a construction machine according to claim 1 or 2 , wherein the collating unit is configured to determine that the collation results match for a predetermined time after turning off the engine key. 2. A flow control device for controlling a flow rate of a pump supplied to a hydraulic actuator to a minimum flow rate when a collation between an operation procedure of the operation switch and a switch operation procedure stored in the storage unit does not match. The anti-theft device for a construction machine according to any one of claims 1 to 3 . A shut-off means for shutting off an oil passage connecting a pilot pump and a remote control valve when a collation between an operation procedure of the operation switch and a switch operation procedure stored in the storage unit does not match with each other. 4. The antitheft device for a construction machine according to any one of 4 . The construction machine according to any one of claims 1 to 5 , further comprising an alarm unit that issues an alarm when the operation procedure of the operation switch does not match the switch operation procedure stored in the storage unit. Anti-theft device.

Images