SU1656569A1 - Device for monitoring and warning indication to protect equipment operating in emergency conditions - Google Patents

Abstract

The invention relates to an instrumentation technique and can be used to monitor and signal if the permissible norms of vibration are exceeded. The aim of the invention is to increase the information content of the device. For this, a device OR 9 and 13 is entered into the device containing the vibrator 1, the amplifier 2, the integrator 3, the detector 4, the threshold blocks 5 and 15, the memory elements B and 7, the alarm block 8, the subtractor 14 and the match element 17, one-shot 10, pulse generator 11, pulse distributor 12 and shift register 16, Depending on the signal from the detector output 4, the threshold unit 5 provides the formation of signals Avariya, Warning 1. When the permissible rate of change of the vibration level at the output of the element 17 is exceeded Warning signal generated yl January 2 / YO

Description

The invention relates to a measuring and control technique and can be used for a system for monitoring and signaling that the permissible levels of vibration have been exceeded.

The aim of the invention is to increase the information content of the device.

The drawing shows a block diagram of the proposed device.

The device contains a vibrator 1, an amplifier 2, an integrator 3, a detector 4, a threshold unit 5, memory element 6 and 7, an alarm block 8, an OR 9 element, a one-shot 10, a pulse generator 11, a pulse distributor 12, an OR 13 element, a block 14, a subtractor, a threshold unit 15, a shift register 16 and a matching element 17.

The device works as follows.

The vibrator 1 is mounted on the unit or its parts and converts the vibration of the unit or its parts into an electrical signal proportional to the vibration acceleration. Integrator 3 converts the signal from the output of amplifier 2 into a signal that is proportional to the vibration velocity, and detector 4 is converted into a signal that is proportional to the root-mean-square value of the vibration velocity. The threshold unit 5, depending on the magnitude of the signal from the output of the detector 4, provides an alarm by the unit 8 signaling signals of Avari. Warning 1.

To increase the noise immunity of the device when exposed to short-term interference, signals from threshold block 5, corresponding to vibration levels of Avariya, Warning 1, through the OR 9 element, trigger a one-shot 10, locking the alarm block 8 for time T. The appearance of subsequent impulses of interference to end the blocking pulse causes to restart the one-shot 10 and the elongation of the blocking pulse. At the end of the blocking pulse, the signaling unit 8 provides the signaling of signals from the threshold unit 5 and the coincidence element 17.

Along the front edges of the pulses from the output of the distributor 12 pulses, the value of the vibration level from the output of the detector 4 is stored by elements 6 and 7 of the memory. For a set value of the vibration level, the difference at the output of subtraction unit 14 is zero. When the vibration level changes between the clock pulses of the pulse generator 11, a new value is set on one of the 6 or 7 memory slots, and at the output of the subtracter 14

a difference signal appears. If the difference signal from the output of subtracting unit 14 exceeds the threshold of triggering unit 15, then the level of the logical unit is recorded in the shift register 16 by the falling edges of the pulses coming from the OR element 13.

Thus, the levels of the logical unit are written to the shift register 16,

if the rate of change of the level of vibration in the intervals between clock pulses exceeds the value determined by the threshold unit 15 and the levels of logical zero otherwise. In the case of the presence of levels of logical units on all inputs of the coincidence element 17, the signal from its output enters the alarm unit 8 independently of the signals Avari and Warning 1, where the signal is generated

Warning 2, corresponding to an unacceptable rate of change in the level of vibration.

The limit value of the permissible rate of change of the vibration level corresponding to the signal Warning 2 is set by selecting the frequency of the generator 11 pulses and the threshold of the threshold unit 15.

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Claims (1)

Invention Formula Control and alarm device to protect the units from emergency operation, containing a vibration transducer, output 5 through which serially connected amplifier, integrator and detector are connected to the input of the first threshold unit and to the first inputs of the first and second memory elements, the outputs of which are connected respectively to the first and second inputs of the subtraction unit, the output of which is connected to the input of the second threshold unit, element a match whose output is connected to the first input of the alarm unit, 5, the first output of the first threshold unit is connected to the second input of the alarm unit, characterized in that, in order to increase the information content of the device, two OR elements, a single vibrator, a pulse generator, a pulse distributor and a shift register are entered into it, the output of the pulse generator is connected to the distributor input pulses, the first and second outputs of which are connected to 5 second inputs of the first and second memory elements, respectively, and to the same inputs of the first OR element, the output of which is connected to the first input of the shift register, the outputs of which are connected to the corresponding inputs of the element coincide deni the output of the second threshold unit is connected to the third input of the unit with the second input of the shift register-nization, the second output of the first contract, the first output of the first threshold unit is connected to the second input of the second connected to the first input of the second element OR to the fourth input of the block that OR. the output of which is through one-to-five signaling.