CN202814704U

CN202814704U - Device for silencing a bearing vibration measurement instrument using a protection circuit

Info

Publication number: CN202814704U
Application number: CN2012202739936U
Authority: CN
Inventors: 潘继康; 潘正宁; 张卫明
Original assignee: HANGZHOU BEARING TEST RESEARCH CENTER Co Ltd
Current assignee: HANGZHOU BEARING TEST RESEARCH CENTER Co Ltd
Priority date: 2012-06-07
Filing date: 2012-06-07
Publication date: 2013-03-20
Anticipated expiration: 2022-06-07

Abstract

The utility model discloses a device for silencing a bearing vibration measurement instrument using a protection circuit. A control switch is added between an output signal of a signal source and an amplifier, and the conduction between the signal source and the amplifier is realized by conducting a proximity switch at a state that a bearing to be measured is completely at the measurement state. In order to protect the normal operation of a triode, a relay is prevented from generating a pulse current during the attracting and releasing process, two ends of a coil of the relay are connected with one freewheeling diode in parallel, and mainly the influence of the pulse current is eliminated, and the normal operation of the circuit is protected. The reading number is quickly and stably measured by the silencing device; the interference of an operation person on the judgment of the bearing is reduced; an instrument display meter is ensured to be stable, the damage rate is reduced, and the device is especially suitable for measuring the device with a counter function.

Description

Adopt holding circuit to the device of bearing vibration measuring instrument noise reduction

Technical field

The utility model relates to the device that can be used in existing each bearing vibration measuring instrument noise reduction, is specially adapted to be applied in the device of BVT bearing vibration measuring instrument noise reduction.

Background technology

Along with Production of bearing producer in recent years strengthens the requirement of bear vibration quality, the differentiation requirement of particularly the different sound of bear vibration being measured, no matter be Production of bearing producer, or bearing uses producer or dealer, its instrument popularization and practicality have obtained vast bearing user's approval substantially, and instrument is differentiated reading stability, reliability and efficient, also aobvious outstanding along with the needs that use producer, as shown in Figure 1, in the past in the apparatus measures process, because bearing need have a mistiming in feeding process and loading, thereby it is noisy to cause measurement to monitor, the indicator gauge overload, measured value is slowly stable, has then affected judgment and the measurement efficient of operating personnel to bearing.Although some factory is corresponding some simple quieter that adopted also, as shown in Figure 2, its defective is that failure rate is high, need often repair, change element.

Summary of the invention

In order to solve the problem of above-mentioned existence; the utility model design is guaranteeing between approach switch and relay control protection electric circuit to be installed in the service-strong situation, thereby guarantees instrument stability in use and reliability; eliminated above drawback, reduced the operational failure rate and improve the differentiation rate.

In order to solve the problems of the technologies described above, the technical solution of the utility model is as follows:

Adopt holding circuit to the device of bearing vibration measuring instrument noise reduction, approach switch is by the base stage of resistance R 1 connection NPN triode, and an end of resistance R 2 is connected between the base stage and described resistance R 1 of described NPN triode, the other end ground connection of described resistance R 2; One end of the collector connection relay Inside coil of described NPN triode, the two ends of described relay internal switch connect outside pre-amplification circuit.

Further, at the two ends of described relay Inside coil fly-wheel diode in parallel.

Beneficial effect of the present invention is: adopt and will install a gauge tap additional between the output signal of signal source and amplifier, and the control of switch needs locate fully under the measuring state at measured bearing, by the approach switch conducting, realizes the conducting of signal source and amplifier; In order to protect triode normal operation, prevent that relay from producing pulse current in adhesive and dispose procedure, in the coil two end parallel connections of relay a fly-wheel diode, mainly be the impact of eliminating pulse current, the holding circuit normal operation; This quieter has the fast and stable survey measurements; Reduce the interference that operating personnel judge bearing; Guarantee that the instrument display table is stable, reduce spoilage, particularly be applicable to the measurement of tape counter function.

Description of drawings

Fig. 1 is original principle of instrument figure;

Fig. 2 is existing simple noise reduction control principle drawing;

Fig. 3 be the utility model adopt have a holding circuit silene system schematic diagram;

Fig. 4 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described further.

As shown in Figure 4, adopt holding circuit to the device of bearing vibration measuring instrument noise reduction, approach switch is by the base stage of resistance R 1 connection NPN triode, and an end of resistance R 2 is connected between the base stage and described resistance R 1 of described NPN triode, the other end ground connection of described resistance R 2; One end of the collector connection relay Inside coil of described NPN triode, another termination of described relay Inside coil is anodal; The emitter of described NPN triode connects negative pole; The two ends of described relay internal switch connect outside pre-amplification circuit.

As shown in Figure 3, when surveying instrument is surveyed bearing (after loading), instrument is in complete measuring state, the loader catch makes the approach switch action near approach switch, namely produces a high level, make the triode conducting through R1 resistance, drive the relay adhesive, conducting measuring amplifier electronic box preamplification board signal makes instrument be in measuring state.Measure complete (unloading), the catch of loader breaks away from approach switch, and approach switch is restored, and approach switch is in low level, the triode cut-off, and relay discharges, and cuts off measuring amplifier electronic box preamplification board signal, finishes a measuring process.Yet in order to protect triode normal operation, prevent that relay from producing pulse current in adhesive and dispose procedure, in the coil two end parallel connections of relay a fly-wheel diode, mainly be the impact of eliminating pulse current, the holding circuit normal operation.

The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, without departing from the concept of the premise utility; can also make some improvements and modifications, these improvements and modifications also should be considered as in the utility model protection domain.

Claims

1. adopt holding circuit to the device of bearing vibration measuring instrument noise reduction, it is characterized in that, approach switch is by the base stage of resistance R 1 connection NPN triode, and an end of resistance R 2 is connected between the base stage and described resistance R 1 of described NPN triode, the other end ground connection of described resistance R 2; One end of the collector connection relay Inside coil of described NPN triode, the two ends of described relay internal switch connect outside pre-amplification circuit.

2.Employing holding circuit according to claim 1 is characterized in that the device of bearing vibration measuring instrument noise reduction, at the two ends of described relay Inside coil fly-wheel diode in parallel.