Coherent light generators – Particular component circuitry – Optical pumping
Patent
1992-12-18
1994-02-08
Epps, Georgia Y.
Coherent light generators
Particular component circuitry
Optical pumping
372 34, 372 58, 372 59, H01S 300, H01S 322
Patent
active
052854574
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. TECHNICAL FIELD
The present invention relates to an apparatus for detecting an abnormal bearing condition of a blower utilized for gas laser equipment, and relates more particularly to an apparatus that detects the abnormal condition by monitoring the output values of a vibration sensor.
2. BACKGROUND ART
A gas laser oscillator for the CO.sub.2 gas laser or others has been widely applied to metal machining and others as gas laser equipment connected with a numerical controller because of its high efficiency, powerful output and excellent beam characteristics. In such a gas laser oscillator, it is necessary to re-cool high temperature laser gas resulting from laser oscillation for the purpose of improving oscillation efficiency; namely, the converting electric energy to photo energy. Therefore, the laser gas is always circulated throughout the gas laser equipment via a cooler by a turbo blower and etc.
The blower for the gas laser equipment generally rotates at a high speed, such as more than 10,000 rpm, and because of this, when there is insufficient bearing lubrication, pockets (holes) of the bearing holder and outer surface thereof wears down, and both inner and outer ring surfaces facing balls or rollers also wear down, thereby increasing the bearing temperature, the load of the motor and the noise generated therefrom as a result of an increase in vibration.
Furthermore, there is the possibility of bearing seizure occurring and portions of the bearing can be damaged if operators do not notice the lack of lubrication or the lubricating oil supply is delayed.
Therefore, in the light of the above mentioned problems, it is an object of the present invention to provide an apparatus for detecting an abnormal bearing condition of a blower utilized for gas laser equipment that immediately detects the abnormal condition of the bearing as a result of a lack of lubrication or otherwise.
DISCLOSURE OF THE INVENTION
In order to solve the above mentioned problem, the apparatus for detecting an abnormal bearing condition of a blower utilized for gas laser equipment according to the present invention comprises a vibration sensor 2 that detects vibration of the bearing mounted at the blower 1 and outputs a vibration detected signal FIS; an amplifier 3 that amplifies the vibration detected signal FIS received from the vibration sensor 2; a comparator 4 that discriminates whether the amplified vibration detected signal FOS exceeds a determined value or not, and outputs an abnormal signal PS when it exceeds the determined value; an alarm command means 5 that outputs an alarm command signal AS when the number of the abnormal signal PS output from the comparator 4 during a determined interval exceeds a determined number; and an alarm display means 6 that displays an alarm when the alarm command signal AS is sent from the alarm command means 5.
The vibration sensor 2 is an acceleration type vibration sensor that detects acceleration elements of vibration or a vibration sensor that detects vibration with a particular frequency.
The vibration detected signal FIS is a peak value of the vibration of the bearing.
The fast Fourier transformer is provided between the amplifier 3 and the comparator 4, and outputs the particular frequency of vibration.
The particular frequency is 6 times as much as the rotation frequency of the blower 1.
The band pass filter is provided between the amplifier 3 and the comparator 4, and outputs the particular frequ of vibration.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a drawing showing the principle structure of an apparatus of the present invention;
FIG. 2 is a drawing showing an embodiment of the present invention;
FIG. 3 is a graph showing a normal bearing condition of a blower shortly after running the blower following a grease supply to the rolling bearings thereof;
FIG. 4 is a graph showing an abnormal bearing condition of a blower long after running the blower following a grease supply to the rolling bearings thereof;
FIG. 5 is a flow chart of a process for the apparatus of
REFERENCES:
patent: 4907240 (1990-03-01), Klingel
patent: 5022039 (1991-06-01), Karube et al.
patent: 5060238 (1991-10-01), Karube et al.
patent: 5111474 (1992-05-01), Funakubo et al.
patent: 5124997 (1992-06-01), Funakubo et al.
Funakubo Tsutomu
Nakahara Kenji
Epps Georgia Y.
Fanuc Ltd.
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