SU562776A1 - Digital linear overload meter - Google Patents

Description

(54) DIGITAL MEASURING LINEAR OVERLOAD

one

The invention relates to sblast. measuring overloads, specifically to devices for measuring linear overloads created by a centrifugal unit.

A device for measuring linear overloads at different distances of the test object from the axis of the centrifugal unit is known, which contains a tachogenerator, adjustable resistance with a scale calibrated in units of the distance from the axis of rotation, and a measuring device with a scale calibrated in units of overload ij

The scales of the gauge measuring device and the adjustable resistance do not provide for the accuracy of the measurement of the overload required in a number of cases.

The closest in technical essence is a device that provides a digital readout proportional to the square of the frequency of the input signal (the magnitude of the linear overload during rotation is proportional to: napnadv to the square of the angular velocity), containing a generator of exemplary frequency, two

counter, census scheme and control 12.

In a known device, the counters must be of the same type, and the census is taken in. additional code.

Additional code is easily obtained using binary counters, however, a complex binary code converter is required to display information. When using binary-decimal counters, the output of information is simplified, but the census scheme forming the additional code is much more complicated.

The purpose of the invention is to simplify the design and measurement of linear overloads in digital form with direct reading.

Claims (2)

This is achieved by the fact that in a meter that contains an exemplary frequency generator and two counters connected to the outputs of the control unit, the switching input of which is connected to the output of one of the counters, one counter is made summing binary-decimal, and the other reversing binary, the output of which is connected to the prohibitive input of the control unit to which the output of the binary-decimal counter is connected via the additionally inputted radius setting; The frame readout is the magnitude of the overload at different distances of the center of gravity of the test object from the axis of rotation and it is rational to construct a scheme for entering information. The drawing shows a block diagram of a digital linear acceleration meter. The meter contains 1 model frequency generator connected to control device 2, to which binary reversible counter 3 is connected, the output of which is connected to the inhibitory input of control device 2, and binary partition counter 4, the output of which cut unit 5 of the radius setpoint is connected to the switching input of the device 2 controls laziness. The work of the overload meter is as follows. The input signal is received with a frequency proportional to the angular velocity of the centrifugal installation. Measurement periodicity is set by external or internal clock pulses. When a clock pulse arrives, the input signal through control device 2 is fed to counter 3 operating in the summing mode, and the signal from the generator 1 of the frequency frequency is fed to counter 4. When the number of pulses received in counter 4 coincides with the number set In block 5, at the radius rate, the latter issues a pulse of the end of the first measurement to the control unit 2. The control unit 2 resets counter 4, switches counter 3 into subtraction mode and delivers the input signal to counter 4, and the signal from the generator 1 of the reference frequency goes to counter 3. When the control device passes through zero, the control device prohibits the passage signals pa counters before the next clock pulse. The information recorded in counter 4 is fed to digital printing and visual display devices. The operation of the meter is described by the expression where W is the measurement result; M is the set value (the number of pulses arriving at counter 4 at the first measurement step); f - sample frequency; {- the frequency of the input signal. Since the magnitude of the linear overload during rotation is determined by the expression yo, where CO is the angular velocity, R is the distance of the object from the axis of rotation, 6 is the acceleration of gravity, {is the frequency of the angular velocity sensor, and is the number of periods of the sensor signal per setting turn , to obtain a digital readout directly in relative acceleration units of N 0, you must choose Ny T И The use of a reversible counter allowed us to simplify the device’s squaring circuit by eliminating the information census scheme, which In turn, it made it possible to perform the second counter optimal from the point of information output. The connection of the output of the binary-decimal counter to the control device through the radius setpoint unit allowed obtaining a digital readout directly in the overload units at different distances of the test object center from the axis of rotation of the centrifugal unit. A digital linear overload meter comprising a generator of exemplary frequency and two meters connected to the output of a control device whose switching input is connected to the output of one of the meters, characterized in that in order to simplify the circuit and measure linear overloads in digital form with a direct reading , one counter is made summing binary, and the other is reversing binary, the output of which is connected to the prohibitory input of the control device, to which through additionally The entered radius setpoint block is connected to the output of a binary-decimal counter. Sources of information taken into account in the examination: 1. USSR author's certificate number 179106, cl. G 01 R 15/08, 1964. 2. Novitsky P. V. and others. Digital devices with frequency sensors. L., 197 Oh., P. 257.