SU1281918A1 - Device for diagnosis of cyclic-action mechanisms - Google Patents

Abstract

The invention relates to vibration diagnostics, can be used to monitor the state of the mechanisms of cyclic action, and is an improvement of the device according to the author. St. No. 429288. The purpose of the additional invention is to increase the reliability of the control. The goal is achieved by introducing into the path 4 the recognition of signals of a block of 14 differentiating circuits, a block of 15 flip-flops and a block of 16 pointer extremums. The device also contains a serially connected vibration sensor 1, a broadband amplifier 2 and a control path 3, the input of which is connected to the input of the recognition path 4. The signal from the vibration sensor 1 is fed through a broadband amplifier 2 to the control path 3 and the signal recognition path 4, the number of channels of which is equal to the number of controlled kinematic pairs of the mechanism. Information on the type of defect is recorded in the display unit 13. 1 il. i l

Description

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The invention relates to vibrodiagnostics, can be used to monitor the state of the mechanisms of action, and is an improvement to the device in 5 author. St. No. 429288.

The purpose of the invention is to enhance. control accuracy

The drawing shows a block diagram of a device for diagnosing mechanisms for cyclic action. The device contains a vibration sensor connected in series, a broadband amplifier 2, the output of which is connected to the inputs of control track 3 and the signal recognition path 4. The control path 3 includes a software control unit 5, the output of which is connected to the control inputs of the inhibit circuit 6 and the valve 7, the outputs of which are connected to the input of the extremum extraction unit 8 connected in series with the synchronous generator 9. The signal recognition path 4 is connected in series 10 switching unit, the filter unit 11., The null-organ unit 12, the display unit 13, as well as the differential price unit 14, the input of which is connected to the output of the clock generator 9, and the output to the input of the trigger unit 15 connected to Locke 10 switching unit 16 and the extremum of pointers, the input of which is connected to the output of Bloch -3-5 ka filter 11, and an output - to the input unit 15 triggers. The output of the amplifier 2 is connected to the inputs of the prohibition circuit 6, the valve 7 and the switching unit 10,

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The device works as follows.

The electrical signal from the output of the vibration sensor 1 is fed to the input of the broadband amplifier 2 and, after 45 of the corresponding converter, is fed to the information inputs of the inhibitor circuit 6, the valve 7 and the switching unit 10. In this case, the switching unit 10 is closed at the control inputs, and 50 the program control unit 5 acts on the prohibition circuit 6 and the ventilator 7 in such a way that the prohibition circuit 6 is closed and the valve 7 is open. Due to this, the signal from the output of the bus 55 of the rockband amplifier 2 through the valve 7 is fed to the memory input of the extremum block 8. After the time required for

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45 50 55

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storing the maximum amplitude of the signal corresponding to the conditional beginning of the cycle of operation of the monitored mechanism, software control unit 5 outputs a signal that closes valve 7 and opens the inhibit circuit 6, resulting in a signal from the output of wideband amplifier 2 to the measuring input of extremum block 8. At the moment when the amplitude of the signal at the output of the wideband amplifier 2 reaches the level recorded by the memory of the extremum extraction unit 8, the latter is triggered and starts the synchronizing generator 9, at each output of which during the period of operation of the mechanism a pulse of duration l c is generated These pulses are equal to the number of controlled kinematic pairs of the mechanism, and the leading edge of each of them corresponds to the beginning of the interaction of the corresponding kinematic pair.

Each of the output pulses of the clock generator 9 acts on a corresponding channel of the signal recognition path 4, which operates as follows. The output signal of the clock generator 9 is fed to the input of the differentiating circuit of the differential circuit unit 14, which forms a short pulse corresponding to the beginning of the interaction of the kinematic pair, and feeds it to the single trigger input of the trigger unit 15. The trigger trigger flows into a single state and opens the electronic key of the switching unit 10. Through the public key, the signal from the output of the broadband amplifier 2 is fed to the filter input of the filter unit 11 and after a time t has expired the signal value at the filter output

reaches the value of U U

max f max

In this case, the extremum pointer of the block of 16 extremum pointers is triggered and by its output signal acts on the zero input of the trigger of the trigger block 15, setting it to the zero state. The open electronic key of the switching unit 10 is closed; zero trigger signal block 15 triggers through time with tij, and the value of the output signal

filter block 11 filters U

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U is compared with U null-Mac. p.

organ block 12 null-organs, which works under the condition U. ,

max f

and and and gives a signal at max.

Claims (1)

the cell of the indication unit 13 of a kinematic pair defect corresponding to this channel of signal recognition, the signal recognition path 4. The remaining channels of the signal recognition path 4 operate similarly. Invention Formula A device for diagnosing the mechanisms of cyclic action by aut. St. 429288, characterized in that, in order to increase the reliability of the control, it is equipped with a differentiating circuit unit, a trigger unit and an extremum indicator unit, the outputs of the synchronous generator are connected to the unit inputs of the trigger unit, the outputs of which are connected to the corresponding controlled inputs of the switching unit, and the zero inputs of the trigger block are connected to the outputs of the extremum indicator block, the inputs of which are connected to the corresponding inputs of the filter block.