CN2285472Y - Bearing fault diagnostic instrument - Google Patents

Abstract

The utility model discloses a bearing fault diagnostic instrument comprising a sensor 3, an amplifier 8, an inching power switch 1 and headphones 15, 17, which are installed in a metal probe casing 6. The contact handle of the inching power switch 1 is extended out of a central through hole arranged on the front end face of a probe. When the utility model works, the probe is attracted on a bearing end cover to be detected under magnetic force action, a normally open contact in the inching power switch 1 is closed, and a circuit is conducted. At this point, the outer sleeve of a bearing is rotated, if the bearing has faults, sonic waves generated by mechanical vibration can be converted into an electrical signal through the sensor 3, and the electrical signal is transmitted to the headphones 15, 17 after magnified by the amplifier 8 and. When detecting work is over, the probe can be taken off from the bearing end cover, and automatic power cut of the circuit can be realized. A charge power supply socket 11 and a voice recording signal output socket 16 are respectively arranged on the two headphones. The utility model has the advantages of small size, high precision of diagnosis, and convenient operation.

Description

The bearing failure diagnosis instrument

The utility model relates to a kind of mechanical fault testing fixture, especially bearing failure diagnosis instrument.

At present, check that at rolling stock bearing fault in-situ employed somascope mainly is made up of sensor, amplifier and power supply, earphone three parts in the operation, be connected by lead between the three.During operation, by the magnet ring on the sensor housing front end face sensor is adsorbed on the end cap of tested bearing, the rolling bearing overcoat, if bearing breaks down, the sound wave that its mechanical vibration produce just can be converted to electric signal, delivers to earphone after amplifier amplifies by sensor, for the operator whether tested bearing fault occurred and has judged.This structure, because the lead between sensor, amplifier and sensor and the amplifier can't shield effectively, so little interference that is subject to check on-site noise and various electromagenetic wave radiations is difficult to judge exactly whether tested bearing fault occurred.In addition, this somascope volume is bigger, must be worked simultaneously by two people during operation, just can finish the inspection operation.Noise is big, and use is inconvenient, efficient is low.

The purpose of this utility model provides that a kind of antijamming capability is strong, volume is little, easy to use, exportable diagnostic signal, and bearing failure diagnosis instrument that need not the manually-operated power switch.

For achieving the above object, solution of the present utility model is: sensor, amplifier and micro power switch are installed in the metal probe housing, and central authorities are provided with through hole at the probing shell front end face, and from then on the handle that touches of micro power switch stretches out in the hole; Battery is installed in the earphone; On two earphones, be respectively equipped with charge power supply jack and recorded audio signals output plughole.

In the above-mentioned solution, owing to adopted sensor, amplifier, micro power switch be installed in the metal probe housing, battery is installed in this structure in the earphone, not only realized effective shielding to sensor and amplifier, reduced and checked on-site noise and because of the influence of electromagnetic wave to checking that precision causes, and reduced volume widely, need not the manually-operated power switch; In addition, also recorded audio signals can be exported.

Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.

Fig. 1 is the overall diagram of the utility model embodiment;

Fig. 2 is an electrical schematic diagram of the present utility model.

In overall diagram shown in Figure 1, sensor 3 and micro power switch 1 are contained on the same circuit board 2, and are fixed on front portion in the probing shell 6 with gland 4; The front end face central authorities of probing shell 6 have through hole, and from then on the handle that touches of micro power switch 1 stretches out in the hole.Amplifier 8 is fixed on rear portion in the probing shell 6 by circuit board 9; The rear portion of probing shell 6 is sealed with end cap 10.Be connected with lead between micro power switch 1 and sensor 3 and the amplifier 8; Connect with three leads 19 between amplifier 8 and the earphone 17.Battery 13 is installed in the earphone 15, and charge power supply jack 11 and recorded audio signals output plughole 16 are housed respectively on earphone 15 and the earphone 17. Volume control potentiometer 12 and 18 also are housed respectively on two earphones.14 is loudspeaker; Setting-in rubber ring 7 in the annular groove of probing shell 6 cylindricals middle part.

Fig. 2 has provided the electrical schematic diagram of bearing failure diagnosis instrument.Constitute prime amplifier by field effect transistor BG and resistance R 1, R2, electrochemical capacitor C1 and Miller capacitance C, the electric signal that sensor T is exported amplifies.Operational amplifier IC and resistance R 5, R6, electrochemical capacitor C3, leaded multilayer ceramic capacitor C5 constitute output power amplifier.Electric signal after prime amplifier amplifies is delivered to power amplifier by capacitor C 2 with the coupling of resistance R 4 and is amplified, and outputs to earphone by coupling capacitance C6 at last.Electrochemical capacitor C1, C4 and resistance R 3 are formed the power supply decoupling circuit, to prevent self-oscillatory generation.Recorded audio signals is taken out by divider resistance R7 two ends, by 16 outputs of recorded audio signals output plughole.

During operation, earphone 15,17 band is on head, and will pop one's head in 6 is adsorbed on the bearing (ball) cover by magnet ring 5; Because the handle that touches of micro power switch 1 stretches out from the front portion of popping one's head in, probe is adsorbed in the process on the bearing (ball) cover, and the handle that touches that promotes micro power switch 1 moves normally opened contact closure in the micro power switch 1 backward, circuit turn-on, the bearing failure diagnosis instrument is started working.At this moment, rolling bearing overcoat, if bearing breaks down, the sound wave that its mechanical vibration produced converts electric signal to by sensor, delivers to earphone again after amplifier amplifies.Listening to the strong and weak available potentiometer 12 and 18 of signal regulates.Signal can be outputed to sound-track engraving apparatus by recorded audio signals output plughole 16.After the end of job, probe were taken away from bearing (ball) cover, micro power switch 1 resetted, the power supply automatic cutout.When using rechargeable battery, can charge by 11 pairs of batteries 13 of charge power supply jack.

Certainly, to the shielding of probe, also can adopt modes such as carrying out metal coating in the non-metal case external body, these conversion all drop within the protection domain of the present utility model.

Claims (2)

1, a kind of bearing failure diagnosis instrument comprises sensor, amplifier and earphone, it is characterized in that: sensor (3), amplifier (8) and micro power switch (1) are installed in the metal probe housing (6); The front end face central authorities of probing shell (6) have through hole, and the handle that touches of micro power switch (1) from then on stretches out in the hole; Battery (13) is installed in the earphone (15).

2, bearing failure diagnosis instrument according to claim 1 is characterized in that: on earphone (15) and (17), be respectively equipped with charge power supply jack (11) and recorded audio signals output plughole (16).

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