JP2000027240A - Theft preventing device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent theft caused by abuse of a key. SOLUTION: An upper revolving structure is provided in a freely revolving manner on a lower traveling body and a braking device 11 for braking a turning motor 6 is provided on the turning motor 6 for driving the upper revolving structure. A controller 25 compares input data for an identification number, when input by an identification number input device 26, with data for an identification number previously stored in a memory and changes the braking device 11 to a brake releasing position only when both correspond to each other.

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 construction equipment in which an upper revolving structure is installed so as to be rotatable for lower traveling such as a backhoe and a self-propelled crane. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device for construction machinery configured to prevent theft by stopping and fixing at a possible position.

[0002]

2. Description of the Related Art As a construction machine, a construction machine having a working arm such as a backhoe, a lifting device such as a crane, or a blade is provided. With this type of construction machinery, starting is
Insert the key into the key switch provided in the driver's seat,
The operation is performed by switching the key from the stop position to the start position, electrically connecting the battery and the cell motor, and rotating the engine by the rotational driving force of the cell motor.

[0003]

However, in order to simplify key management and reduce costs, it has been attempted to use the same key switch for the same type of construction machine. If the same type of construction machine can be started, theft due to misuse of the key may occur frequently.

[0004] Therefore, in a construction machine in which the same model is provided with the same key switch, there arises a technical problem to be solved in order to prevent theft due to misuse of the key.
An object of the present invention is to solve the problem.

[0005]

According to the present invention, in order to achieve the above object, an upper revolving structure is provided on a lower traveling structure so as to be revolvable, and a revolving motor for driving the upper revolving structure and a braking device for the revolving motor are provided. In the provided construction machine, when a personal identification number is input by the personal identification number input device, the input data of the input personal identification number is compared with the data of the personal identification number stored in the memory in advance, and the two match. The present invention provides an anti-theft device for a construction machine including a controller that switches the braking device to a braking release position when the device is released.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an anti-theft device for a construction machine. In FIG. 1, reference numeral 1 denotes an operating hydraulic circuit for operating the construction machine, and reference numeral 2 denotes an anti-theft device for preventing theft. In the working hydraulic circuit 1, a discharge port of a main pump 4 that supplies working oil to the main line 3 is connected to an upstream end of the main line 3, and a control valve 5 is provided in the main line 3. A drive circuit 7 for a swing motor 6 is connected to the main line 3 via a valve 5. In the present embodiment, the control valve 5 is constituted by a switching valve that is switched by a pilot pressure, and when the braking position is switched from the braking position to the braking release position, the drive circuit 7 of the turning motor 6 is connected to the main line 3. The hydraulic oil is supplied to the suction port of the swing motor 6 by the communication, and conversely, when the brake oil is switched to the braking release position, the communication between the main line 3 and the drive circuit 7 of the swing motor 6 is cut off. Be composed.

[0007] Although not shown, the control valve 5 is connected to the drive circuit 7 of the swing motor 6 to communicate with the main line 3 to swing the swing motor 6. The discharge port is configured to communicate with the drain tank 8 to discharge hydraulic oil.

The turning motor 6 has a brake plate attached to a motor shaft 9 of the turning motor 6 in order to restrict rotation due to inertia and to stop an upper turning body (not shown) at a turning position expected by an operator. In the vicinity of the turning motor 6, there is provided a friction braking device 11 that brakes by frictionally contacting the braking plate 10.

The friction brake device 11 includes a brake shoe 13 that brakes the motor shaft 9 via the brake plate 10 by being brought into contact with an outer peripheral surface 12 of the brake plate 10 with a predetermined pressing force. The brake shoe 13 is attached to the brake plate 10
Actuator 1 that abuts against a predetermined pressing force to brake
The actuator 14 is provided with a brake shoe 13 in a cylinder 15 and the brake plate 1.
A cylinder rod 16 for contacting / separating the cylinder 15 is slidably housed, and a bottom side 1 of the cylinder 15 is
7 accommodates a return spring 18 that urges the cylinder rod 16 toward the extension side by urging the cylinder rod 16 to extend.
The oil passage 20 is connected to the rod side 19 of the drain 5, and the drain tank 8 is connected to the upstream end of the oil passage 20 via a switching valve (spring return type 4 port 2 position switching solenoid valve) 21.
And the pilot pump 22 are selectively connected to each other.

Therefore, when the switching valve 21 is switched from the braking position to the braking release position, the rod side 19 of the cylinder 15 communicates with the drain tank 8, and conversely,
When switching from the braking release position to the braking position, the discharge port of the pilot pump 22 communicates with the rod side 19 of the cylinder 15, and the switching valve 21 is switched to the braking position. Sometimes, the cylinder rod 16 is actuated to the extension side by the elastic force of the return spring 18 housed on the bottom side 17 of the cylinder 15, and the brake shoe 13 provided at the tip of the cylinder rod 16 is pushed by a predetermined force. The brake plate 1 by pressure
It will come into contact with 0.

When the switching valve 21 is switched to the braking release position, the rod side 19 of the cylinder 15
The hydraulic pressure against the elastic force of the return spring 18 is introduced into the
The brake shoe 13 is moved away from the brake plate 10 by being moved to the contraction side against the resilience force of the brake plate 8. Therefore, the swing motor 6 can be accurately stopped at an arbitrary position by switching the switching valve 21, and the upper swing body of the construction machine can be stopped at the swing position expected by the operator.

On the other hand, a cabin or the like of a construction machine (not shown)
The turning lock switch 23 disposed in the controller electrically connects the contact point of the starter motor (not shown) and the contact point of the battery, starts the engine 24, and electrically connects the controller 25 via the input line 29 to the controller 25. And an ON / OFF signal of the turning lock switch 23 is input to the controller 25. The controller 25 can of course be constituted by a well-known sequencer, but in the present embodiment is constituted by a well-known microcomputer mainly comprising a CUP, a memory, an I / O, etc. The switching valve 21 is switched to the braking position when an ON signal is input from the controller, and the switching valve 21 is switched to the braking release position when an OFF signal is input.

Further, the controller 25 is provided in a cabin of a construction machine or in a pocket (not shown) or the like partitioned into a body outer plate or the like (not shown). The operation is such that a password for releasing the brake is inputted through the input line 28, and when the password is inputted by the password input device 26, the password is sequentially recognized and encoded in the input order. It is configured. The controller 25 compares the encoded data of the personal identification number encoded by the comparison operation part with the encoded data of the corresponding personal identification number stored in a memory (not shown) of the controller 25 in advance. ,
If both match, it is determined that "there is a password", and if they do not match, it is determined that "there is no password".

That is, as shown in the timing chart of FIG. 2, the controller 25 transfers the password comparison result to the switching valve 21 via the output line 30 together with the switching result of the turning lock switch 23. The switching valve 21 is switched to the brake release position when the password is correctly input. However, when there is no input of the password or when the input does not match, the input of the incorrect user is performed. It is configured that the switching signal is not sent to the switching valve 21 and the brake valve is maintained at the braking position. Therefore, after the switching position of the upper revolving structure with respect to the lower revolving structure (not shown) of the construction machine is previously turned by the switching valve 21 to a position where it cannot be transported by a car, the turning rocking switch is turned off. If the turning motor 23 is turned on to brake the turning motor 6 and the control valve 5 is switched to a position where hydraulic oil is not supplied to the drive circuit 7 of the turning motor 6 to stop the upper turning body, not only self-propelled but also theft by on-vehicle Can be prevented.

In FIG. 1, reference numeral 27 denotes a backup power supply (battery) for supplying drive power to the controller 25. Hereinafter, the operation according to this embodiment will be described with reference to FIG.

When the turning lock switch is switched to the ON position for stopping the construction machine, the turning lock switch 2 is input to the controller 25 through an input line 29.
3 ON signal is input. At this time, the controller 25 switches the switching valve 21 to the braking position, and
To the drain tank 8, and the 19 hydraulic oil on the rod side of the cylinder 15 is discharged to the drain tank 8. Therefore, the resilience of the return spring 18 housed in the bottom side 17 of the cylinder 15 is released, and the cylinder rod 16 is moved to the extension side by the resilience. When the cylinder rod 16 moves to the extension side, the cylinder rod 1
The brake shoe 13 integrated with the distal end of the brake shoe 6 comes into contact with a brake plate 10 integrally connected to the motor shaft 9 of the turning motor 6 to generate a predetermined frictional force between the brake shoe 13 and the brake plate 10. generate. For this reason, the motor shaft 9 of the turning motor 6 stops, and the upper turning body driven by the turning motor 6 stops.

When a key switch (not shown) is switched from OFF to ON to start the construction machine, the engine 24, the main pump 4 and the pilot pump 22 using the engine as a power source are started, and the controller 25 is started. Waits for switching of the turning lock switch 23 and input of a correct password by the password input device 26.

When the turning lock switch 23 is turned on and a password is input by the password input device 26, it is determined by comparison operation whether the password is correct or incorrect. Only when it is correct, the switching valve 21 is switched to the brake release position.

That is, when the lock switch 23 is turned on and a password is input by operating a group of switches of the front password input device 26, the controller 25 reads the passwords in the order of the internal stack in the input order. And the input data is stored in the controller 2
The encoded data is encoded by the arithmetic processing unit 5 and the encoded data is compared with the encoded data of the personal identification number stored in the memory in advance. When the input coded data matches the coded data of the password stored in the memory in advance, "there is a password"
If there is a mismatch, it is determined that there is no password, and if "there is a password", the switching valve is switched to the brake release position on the assumption that the user is a valid user. In the case of "none", the switching valve 21 is held in the braking position on the assumption that the switch is used by an unauthorized person. Therefore, as described above, the revolving position of the upper revolving unit with respect to the lower revolving unit is previously turned by the switching valve 21 to a position where transport by a car is impossible, and then stopped. By turning on the turning motor 6 and stopping the upper turning body, it is possible to prevent not only self-propelling but also theft by a vehicle, and after unlocking, the turning lever (not shown) in the cabin is operated. By switching the control valve 5 to communicate the main line 3 with the drive circuit 7 of the swing motor 6, the swing motor 6
Is driven, and the upper swing body swings with respect to the lower running body.

In a construction machine in which an upper revolving structure is rotatably provided on a lower traveling structure, and a revolving motor 6 for driving the revolving structure is provided with a friction braking device 11 for frictionally braking the revolving motor 6, Turning angle detection means (magnetic sensor or optical sensor, provided on one of the revolving superstructure and the lower revolving superstructure, for detecting a revolving angle of the upper revolving superstructure with respect to the lower revolving superstructure;
Or a microswitch), and the controller 25
When the swing lock switch 23 is turned off, the control valve 5 is driven by the drive circuit of the swing motor 6 until the swing angle of the upper swing body becomes a swing angle that cannot be mounted on the lower swing body. 7 is connected to the main line, and when the swing angle of the upper swing body coincides with a swing angle that cannot be mounted on the upper swing body, the control valve 5 is driven by a drive circuit of the swing motor 6. The communication between the main line 3 and the main line 3 is interrupted, and the switching valve 21 is switched to the braking position. Further, the turning lock switch 23 is switched on, and the switching password input device 26 is used. When a password is input, the input data of the input password is compared with the data of the password stored in the memory in advance, and the comparison results match. Only, It is acceptable to configure the anti-theft system for a construction machine constitute said change-over valve 21 to 換Ru so cut to the brake release position when.

The turning lock switch 23 is turned on when the key switch is turned off, and the turning lock switch 23 is turned off when the key switch is turned on. Switching of the switches can be simplified.

Further, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified invention.

[0023]

As described in detail in the above embodiment, the present invention provides an upper revolving unit provided on a lower traveling unit so as to be revolvable, a revolving motor for driving the upper revolving unit, and a braking device for the revolving motor. In the construction machine provided, a lock switch for braking the swing motor is provided, and the lock switch is
N, a controller for switching the braking device to a braking position to lock the operation of the turning motor, wherein the lock switch is switched from ON to OFF, and a password is input by a password input device. Sometimes, the controller compares the input data of the input personal identification number with the data of the personal identification number stored in the memory in advance, and switches the braking device to the braking release position when they match. Since it is provided, beforehand, after turning the turning position of the upper revolving structure with respect to the lower revolving structure to a position where it cannot be transported by vehicle and stopping by the switching valve, the turning motor is braked by turning on the lock switch,
Stopping the upper revolving unit not only prevents self-propelled operation but also prevents theft caused by the vehicle. In addition, the same key switch can be used for the same type of construction machine, and it is possible to relieve the troublesome key management.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention and showing an operation hydraulic circuit of a construction machine and an anti-theft device.

FIG. 2 shows an embodiment of the present invention and is a timing chart of an anti-theft circuit.

[Explanation of symbols]

 6 Swivel motor 11 Friction braking device (Brake device) 23 Swivel lock switch (Lock switch) 25 Controller 26 PIN input device

Claims (1)

[Claims] 1. A construction machine provided with a swinging motor for driving an upper swing body and a swing motor for driving the upper swing body and a braking device for the swing motor, wherein a password is input by a password input device. When the input is made, the input data of the input personal identification number is compared with the data of the personal identification number stored in the memory in advance, and when they match, a controller for switching the braking device to the braking release position is provided. An anti-theft device for a construction machine, comprising: