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State detection device, state detection method, state detection program, and information recording medium

  • US 8,214,160 B2
  • Filed: 01/31/2007
  • Issued: 07/03/2012
  • Est. Priority Date: 02/28/2006
  • Status: Active Grant
First Claim
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1. A state detecting apparatus for detecting a current operating state of a linear motion rolling guide unit, the state detecting apparatus comprising:

  • an operating frequency obtain unit for obtaining an operating frequency of the linear motion rolling guide unit to be inspected;

    a generated frequency of a noise signal obtain unit for obtaining a generated frequency of a noise signal which can be generated by a device other than the linear motion rolling guide unit to be inspected that is operating near the linear motion rolling guide unit;

    a determination unit for determination of whether the operating frequency and the generated frequency of a noise signal are equal or not;

    a detection unit for detecting a wave motion which is elastically generated due to at least one of collision which occurs between a rolling surface contained in the linear motion rolling guide unit and a rolling body when a plurality of rolling bodies contained in the linear motion rolling guide unit are revolving in a circulation portion while spinning themselves;

    slip in a contact portion between the rolling surface and the rolling body;

    collision between the rolling bodies themselves, slip in a contact portion of the rolling bodies themselves; and

    crack which occurs in at least one of the rolling body and the rolling surface; and

    for generating an electrical detection signal corresponding to the detected wave motion;

    a transform device for configuring measured data group using individual measured data obtained by sampling the generated detection signal, performing Fourier transform on the measured data group, and generating a transformed measured value, respectively,an extraction device for extracting only the transformed measured value corresponding to a frequency corresponding to an operating frequency of the linear motion rolling guide unit from the generated transformed measured values after performing the Fourier transform;

    a generation device for generating a parameter indicating an intensity of the wave motion by adding data corresponding to an intensity of the transformed measure value to data corresponding to harmonic content of the operating frequency based on the extracted measured value as extracted; and

    a determination device for comparing a value of the generated parameter and a threshold predetermined for the parameter and determining whether the operating state is normal or not.

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