Information terminal and machine component diagnosis system

Abstract

An information terminal is configured to extract a predetermined frequency band from a waveform of a signal of a machine component detected by a vibration sensor, to compare an analyzed frequency component and a damaging frequency resulting from a damage of the machine component, and to diagnose abnormality of the machine component. The information terminal includes a database in which the damaging frequency resulting from the damage of the machine component is preserved as a converted damaging frequency obtained by converting the damaging frequency on a basis of a predetermined rotating speed of the machine component. The damaging frequency is provided by calculating the converted damaging frequency in the database by using an actual rotating speed of the machine component. Accordingly, it is possible to keep specifications of a machine component confidential without preserving the specifications of the machine component.

1 . An information terminal configured to extract a predetermined frequency band from a waveform of a signal of a machine component detected by a vibration sensor, to compare an analyzed frequency component and a damaging frequency resulting from a damage of the machine component, and to diagnose abnormality of the machine component, the information terminal comprising:
 a database in which the damaging frequency resulting from the damage of the machine component is preserved as a converted damaging frequency obtained by converting the damaging frequency on a basis of a predetermined rotating speed of the machine component,   wherein the damaging frequency is provided by calculating the converted damaging frequency in the database by using an actual rotating speed of the machine component.   
     
     
         2 . The information terminal according to  claim 1 ,
 wherein the converted damaging frequency preserved in the database is calculated for each of the machine components of a plurality of bearing numbers, based on specifications of the machine component of the bearing number and a predetermined rotating speed of the machine component, with a predetermined relation equation for providing the damaging frequency, and   wherein the damaging frequency is provided by calculating the converted damaging frequency corresponding to the bearing number in the database by using the actual rotating speed of the machine component.   
     
     
         3 . The information terminal according to  claim 2  further comprising a display operation unit for inputting or selecting the bearing number of the machine component,
 wherein when the converted damaging frequency corresponding to the input or selected bearing number is included in the database, the damaging frequency is provided by calculating the converted damaging frequency corresponding to the bearing number in the database by using the actual rotating speed of the machine component, and 
 wherein when the converted damaging frequency corresponding to the input or selected bearing number is not included in the database, the damaging frequency is calculated on a basis of specifications of the machine component directly input from the display operation unit and the actual rotating speed of the machine component or on a basis of the converted damaging frequency directly input from the display operation unit and the actual rotating speed of the machine component, with the predetermined relation equation for providing the damaging frequency. 
 
     
     
         4 . The information terminal according to  claim 1 ,
 wherein the machine component is a bearing,   wherein in the database, a bearing damaging frequency resulting from damages of an inner ring, an outer ring, a rolling element and a cage of the bearing is preserved as a converted bearing damaging frequency obtained by converting the bearing damaging frequency on a basis of a predetermined rotating speed of the bearing, and   wherein the bearing damaging frequency is provided by calculating the converted bearing damaging frequency in the database by using an actual rotating speed of the bearing.   
     
     
         5 . A machine component diagnosis system comprising:
 the information terminal according to  claim 1 ; and   a vibration analyzer capable of transmitting and receiving a signal to and from the information terminal,   wherein the vibration analyzer comprises:   the vibration sensor configured to detect vibration of the machine component;   a filter processing unit configured to extract a predetermined frequency band from a waveform of a signal detected by the vibration sensor; and   a calculation processing unit configured to analyze frequency of a waveform after filter processing obtained by the filter processing unit and to obtain spectrum data, and   wherein the information terminal comprises:   a diagnosis unit configured to compare the frequency component, which is included in the spectrum data transmitted from the vibration analyzer, and the damaging frequency resulting from the damage of the machine component, and to diagnose abnormality of the machine component; and   a display unit configured to output a diagnosis result diagnosed by the diagnosis unit.