SU1268992A1 - Device for vibration diagnostic checking of cyclic mechanisms - Google Patents

Abstract

The invention relates to vibration measuring technology and can be used to test and control sliding bearings and friction gear mechanisms. The purpose of the invention is to improve the accuracy of measuring the vibroactivity of sliding bearings by supplying the device with a circuit for generating gating pulses that are not rigidly connected with the pulse of the beginning of the mechanism turn. As a result, in the intervals between the analyzed vibration pulses, the overall vibration level of the machine is measured, followed by subtraction from the measurement result of the amplitude of the vibration pulse, and the formation of gating pulses occurs at the time of the appearance of the vibration pulses. 1 il.

Description

N3

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CD N3

The invention relates to vibration measuring technology and can be used to test and control sliding bearings and friction gears of mechanisms.

The purpose of the invention is to improve the accuracy of measuring the vibroactivity of slide bearings, which provides more accurate control of their condition.

The drawing shows a block diagram of a device for vibration diagnostics.

The device contains serially connected vibration converter 1, matching unit 2, filter block 3, first switch 4, measuring transducer block 5, averaging block b, adder 7, indication block 8, beginning of revolution determining block 9, the input of which is connected to the output of matching block 2, the second driver 10, whose input is connected to the output of the start-of-turn detection unit 9, the second switch 11, whose inputs are connected to the output of the second driver 10 and the output of the filter unit 3, the second amplitude detector 12, the cat input Oogo connected to the output of the second switch 11, and the output to the input of the adder 7, the first driver 13, the inputs of which are connected to the output of block 9 of the beginning of the revolution and the output of the second amplitude detector 12, and the output to the inputs of the second driver 10 and the first switch 4, and the first amplitude detector 14, the input of which is connected to the output of the filter unit 3, and the output to the input of the first shaper 13.

The device works in the following way.

When the vibration converter 1 is installed on the casing of the mechanism, the vibration of the latter is converted into electrical signals and amplified in the matching unit 2. By the impulse of the detecting beginning of revolution 9, the formers 13 and 10 are reset. After block 3 of filters, the selected informative frequency range, the signal determining the level of vibration is fed to the inputs of switches 4 and 11 and to the input of the first amplitude detector 14, which selects the envelope of the signal. The first driver 13 generates gating pulses depending on the moment of occurrence of the vibration pulse.

The principle of operation of shaper 13 is as follows.

When the envelope of the vibration signal passes from the output of the first amplitude detector 14 through a certain constant level, the comparator included in the generator 13 produces two pulses of different polarity, which determine the position of the gating pulse with respect to the start-of-rotation pulse. These pulses

controls the trigger that directly generates the gating pulse. The latter controls the first switch 4, through which the vibration impulse enters the measurement path, including the measuring transducer unit 5, the averaging unit 6, the adder 7 and the display unit 8. The falling edge of the strobe pulse from the output of the first driver 13 starts a similar driver 10, the pulse of which

0 controls the second switch 11. At the same time, the input of the second amplitude detector 12 receives signals determined by the overall vibration level of the mechanism. The vibration impulses corresponding to the operation of the cylinders of the mechanism, connected directly with other bearings, are much smaller in amplitude than the vibration impulses produced during the operation of the cylinder directly connected with the diagnosed bearing. Thus, the inputs of Summer 7 are supplied with different voltage signs, one of which determines the vibration level of the diagnosed bearing, and the other, the overall vibration level of the mechanism. The differential signal is fed to the display unit 8. In addition, a voltage corresponding to the overall level of vibration of the mechanism is supplied to the first driver 13 to adjust the level of direct voltage when the total level of vibration of the mechanism changes.

Claims (1)

Formula of invention A device for vibration diagnostics of cyclic mechanisms, comprising a series-connected vibration transducer and a matching unit, a start-turn detection unit, a series-connected first switchboard, a filter unit, a measuring transducer unit, an averaging unit and an indication unit, characterized in that, in order to improve the diagnostics accuracy, into it The first A. amplitude detector is introduced, the input of which is connected to the output of the filter unit, the first driver, the Kotopoio inputs are connected to the outputs of the first amplitude detector and the start of rotation detection unit, and the output is connected to the first switch, the second driver, whose inputs are connected to the output. h of the first driver and the unit for determining the beginning of turnover, the second com.mutator. the inputs of which are connected to the outputs of the filter unit and the second driver, the second amplitude detector, whose input is connected to the output of the second switch, and the output connected to the input of the first driver, and the adder, whose inputs are connected to the outputs of the averaging unit and the second 5 amplitude detector, and the output is connected to the display unit.