SU1388729A2 - Device for diagnostics of cyclic mechanisms - Google Patents

Abstract

The invention relates to a measurement technique and can be used to monitor the state of mechanisms according to their vibration characteristics. The aim of the invention is to improve the performance of measurements. The signal from the output of the vibration sensor through the broadband amplifier 2 is fed to the inputs of the paths 3 and 4 of the control and recognition of signals. The software control unit 5 prohibits the passage of the signal through the control circuit 6 and permits its passage through the valve 7 to the memory input of the extraction unit 8 to the extremum

Description

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ma When the time required to fill the maximum amplitude of the signal expires, block 8 opens the inhibitor 6 and closes gate 7. The signal from the output of amplifier 2 goes to the measuring input of block 8. At the moment the signal reaches the filled value, block 8 starts the synchronous generator 9, made in the form of a converter voltage to the frequency to the second input of which the signal from the output of the phase detector 13 arrives. At each of the outputs of the synchronous generator 9 during the period of operation of the monitored mechanism appears gating conductive pulse General

the number of which is equal to the number of controlled kinematic pairs of the mechanism. The measured signal from amplifier 2 through the switching unit 14, the filter unit 15, the null-organs block 16 goes to the display unit 17. The phase detector 13 controls the frequency of the synchronizer 9 by signals from the block 11 of rectangular pulse formers passing through the OR 12 element and thereby realizes an automatic linking of the time of the appearance of gating pulses to the instant of interaction of the corresponding kinematic pairs of the monitored mechanism. 1 il.

The invention relates to a measurement technique, can be used to control the state of mechanisms according to their vibration characteristics, and is additional to the author. St. No. 429288.

The aim of the invention is to improve the performance of measurements by eliminating the need to repeatedly start the device when diagnosing mechanisms.

The drawing shows the structural structure of the proposed device.

The device contains a vibration sensor 1 connected in series, a broadband amplifier 2, the output of which is connected to the inputs of the control path 3 and the signal recognition path 4. The control path 3 includes a program control block 5.

the equal inputs of the prohibition circuit 6 and the valve 7, the outputs of which are connected to the inputs of the extremum extraction unit 8, the output of the latter is connected to the first input of the synchronous generator 9, the first element OR 10 whose inputs are connected to the outputs of the synchronous generator 9, the block 11 of the drivers of rectangular pulses The outputs of which are connected to the inputs of the second element OR 12. The outputs of the elements OR 10 and 12 are connected to the first and second inputs.

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Phase detector 13, respectively, the output of the phase detector 13 is connected to the second input of the clock generator 9. Signal recognition path 4 includes series-connected switching unit 14, filter unit 15, the outputs of which are connected to the inputs of block 11 of control square drivers of control path 3 , block 16 of zero-organs, block 17 of indication. The output of the amplifier 2 is connected to the inputs of the prohibition circuit 6 of the valve 7 and the switching unit 14, the control inputs of which are connected to the outputs of the synchronizing generator 9.

The device works as follows.

The electrical signal from the output dat-. Vibration pin 1 is fed to the input of the wideband amplifier 2 and, after a corresponding conversion, is fed to the information inputs of the prohibition circuit 6, the valve 7 and the switching unit 14. In this case, the switching unit 14 is closed at the control inputs, and the program control unit 5 acts on the prohibition circuit 6 and the valve 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 broadband amplifier 2 through the valve 7 is fed to the memory input of the extremum extraction unit 8.

After the time required to memorize the maximum signal amplitude corresponding to the conditional beginning of the cycle of operation of the monitored mechanism, the program control unit 5 outputs a signal that closes valve 7 and opens the inhibit circuit 6, resulting in a signal from the output of the wideband amplifier 2 the input of the extremum extraction unit 8, At the moment when the amplitude of the signal at the output of the wideband amplifier 2 reaches the level fixed by the memory input of the extremum extraction unit 8 , the latter triggers and starts the synchronous generator 9, made in the form of serially connected master oscillator (voltage generator to frequency), whose frequency corresponds to the specified diagnostics mode (high-speed mode of the monitored mechanism) and shift register, the corresponding outputs of which serve as outputs of the synchronous generator 9, the second input of which at this time receives the initial, corresponding to the specified diagnostic mode, the voltage from the output of the phase detector 13. This voltage is the output A gating pulse appears at each of the outputs of the synchronous generator 9 during the period of operation of the mechanism, the total number of which is equal to the number of controlled kinematic pairs of the mechanism. From the first output of the clock generator 9, the first gate pulse is simultaneously fed to the first input of the first element OR 10 and to the control input of the first key of the switching unit 14. The key opens, and, the signal corresponding to the connection - „

mode of action of the first kinematic

mechanism, from amplifier 2 enters the first filter of the filter block 15. From the output of the first filter, the signal is fed to the input of the first null-organ of block 16, where it is compared with the threshold voltage of this null-organ. The result of the comparison is recorded by the first cell of the display unit 17 about the defect of the first kinematic pair. At the same time, the signal is fed to the input of the first shaper unit of 11 square pulse shapers, the latter is converted into a rectangle

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a pulse that arrives at the first input of the second element OR 12. From the outputs of the elements OR 10 and 12, the indicated pulses go to the first and second inputs of the phase detector 13, the output voltage of which goes to the second input of the clock generator 9.

: During the cycle of operation of the mechanism in accordance with the specified diagnostic mode, by the time of the interaction of the second kinematic pair of the monitored mechanism at the second output of the synchronous generator 9 a second gate pulse and sequence of signals in the path 4, the first element of RSII 10, block 11 square pulse drivers, the second element OR 12, and phase detector 13 are repeated. This happens during the entire cycle of the mechanism.

Since the first gating pulse corresponds to the conditional start of the mechanism and the moment of its appearance is determined by the moment of interaction of the first kinematic pair, which excites the maximum vibration level, the phase shift between the pulses at the inputs of the phase detector 13 is absent and the voltage at its output remains equal to the initial one.

During the cycle of operation of the mechanism with increasing (decreasing) of its actual speed mode relative to the specified diagnostic mode, a phase shift appears between the leading (falling) pulse edges at the inputs of the phase detector 13, which leads to an increase (decrease in the initial voltage at its output and, accordingly, to an increase (decrease) in the frequency of the master oscillator of the synchro-generator 9 and, consequently, to a decrease (increase) in the pause between the gating pulses alternating in the cycle of the mechanism, i.e. there is an automatic linkage of the moment when the gating pulses appear to the moment of interaction of the corresponding kinematic pairs of the mechanism.

Form-Ula Invention

A device for diagnosing the mechanisms of cyclic action according to auth. No. 429288, characterized by the fact that, in order to improve the performance of the measurements, it is provided in the control path of two OR elements, a block of square pulse shapers, a phase detector, the first input of the phase detector is connected to the output of the synchronous generator through the first element OR , the block of rectangular pulse shapers is connected to the second input of the phase detector through the second element OR, sync generator

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made in the form of a voltage to frequency converter and connected by a second input to the output of the phase detector via the second OR element, the synchronous generator is made in the form of a voltage to frequency converter and connected by a second input to the output of the phase

the detector, and the input of the rectangular pulse shaper unit is one of the control path inputs and is connected to the code of the filter unit. signal recognition path.

Claims (1)

Form ula isob Device for diagnosing mechanisms of cyclic action according to ed. No. 429288, I distinguish55 1388729 6 more with the fact that, in order to increase, it is made as a measurement performance converter, it is equipped with · in the control path of two OR elements, a rectangular pulse shaper unit, a phase detector, the first input of the phase detector is connected to the output of the synchronizer through the first OR element, the block of the formers of rectangular pulses is connected to the second input of the phase detector through the second element OR, the voltage synchro generator and is connected by the second input to the output of the phase detector through Torah OR element, configured as a synchronous generator inverter voltage-to-frequency and a second input connected to the output of the phase detector and the input of block formers rectangular pulse is one of the control path and inputs connected to the output of the filter unit tract signal recognition.