MACHINE STATE MONITORING DEVICE

• US 20190332090A1
• Filed: 04/24/2019
• Published: 10/31/2019
• Est. Priority Date: 04/27/2018
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: SAKAI, Koujirou
• Granted Patent: US 11,340,580 B2
• Time in Patent Office: Days
• CPC Class Codes: G05B 19/406 characterised by monitoring or safety G05B19/19 takes precedence
• CPC Class Codes: G05B 19/4065 Monitoring tool breakage, life or condition
• CPC Class Codes: G05B 2219/36545 Safety, save data at power loss
• CPC Class Codes: G05B 2219/50083 Power loss, measures again loss of power
• CPC Class Codes: G05B 2219/50203 Tool, monitor condition tool

Abstract

A machine state monitoring device is a machine state monitoring device that is intended for a motor drive device of a machine tool. The motor drive device includes: a motor; a converter and an inverter that adjust a power supply voltage; a power failure detection unit that acquires an input voltage of the motor drive device so as to detect a power failure in the motor drive device; and a communication unit that transmits, based on the result of the detection of the detection unit, a time when the power failure is started, and a time when the power failure is completed. The machine state monitoring device includes: a communication unit that receives information of the time when the power failure is started and the time when the power failure is completed from the communication unit of the motor drive device; and a storage unit that stores the information.

Claims

1. A machine state monitoring device for a motor drive device in a machine tool,

wherein the motor drive device includes:

a motor;

a converter and an inverter that adjust a power supply voltage so as to supply power to the motor;

a detection unit that acquires an input voltage of the motor drive device so as to detect a power failure in the motor drive device; and

a transmission unit that transmits, based on a result of the detection of the detection unit, a time when the power failure is started, and a time when the power failure is completed, and

the machine state monitoring device includes;

a reception unit that receives information of the time when the power failure is started and the time when the power failure is completed from the transmission unit of the motor drive device provided in each of a plurality of the machine tools; and

a storage unit that stores the information.

2. The machine state monitoring device according to claim 1, wherein the transmission unit further transmits information on whether a protection operation for protecting the machine tool is completed during a period from the time when the power failure is started until the time when the power failure is completed, and the storage unit further stores the information.

3. The machine state monitoring device according to claim 1, wherein the transmission unit further transmits, to the machine state monitoring device, information of a state of machining in the machine tool when the power failure is detected, and the storage unit further stores the information.

4. The machine state monitoring device according to claim 1, wherein the transmission unit further transmits, to the machine state monitoring device, information of a waveform of the input voltage at the time when the power failure is started, and the storage unit further records the information.

5. The machine state monitoring device according to claim 1, wherein when a protection operation for protecting the machine tool is performed during a period from the time when the power failure is started until the time when the power failure is completed, the transmission unit further transmits, to the machine state monitoring device, at least one of pieces of information that are a speed of the motor, a torque of the motor, and an output voltage of the converter during the protection operation, and the storage unit further records the information.

6. The machine state monitoring device according to claim 1, wherein after the power failure is completed and then power of the machine tool is returned, the transmission unit transmits again the information to the machine state monitoring device.

7. The machine state monitoring device according to claim 1, wherein the motor drive device further includes an anti-power failure device that includes an electric storage means, and

the transmission unit transmits information of an amount of electricity stored in the electric storage means, and the storage unit further stores the information.

8. The machine state monitoring device according to claim 1, further comprising a control unit that controls the machine tools,

wherein the control unit sets, for the detection unit in each of the machine tools, a voltage for the detection of the power failure by the detection unit.