SU1363281A1 - Shaft rotation signalling device - Google Patents

Abstract

The invention relates to automation and can be used to control the synchronism of rotation of the shafts of mainly low-speed machines, in particular, the shafts of the power drive of the tillage machines. For simplicity, the signaling device contains sensors 1, 2 pulses, one-vibration 3, 4, counter 5, element OR 6, and signaling unit 7, the outputs of counter 5 are connected to the inputs of elements OR 6, the outputs of which are connected to the control input of the single-vibration 4 . When the shafts are synchronously rotated, the pulses of the same frequency are generated at the outputs of sensors 1 and 2, and hence the single-oscillators 3 and 4. At the same time, at the information outputs of the counter 5, the signal voltage is zero. Block 7 alarm is disabled, indicating a zero mismatch of the monitored shafts. When the shaft rotation speeds do not match, the frequency of the pulses of the single vibrator 4 (output shaft) changes, which leads to the appearance of a logical unit signal on one information output of the counter 5. The alarm unit 7 registers this signal. At the same time, this signal, through the one-oscillator 4, blocks the operation of the counter 5 for a time convenient for visual registration by the operator of the signaling unit 7 of 1 slug. 15 L i (L with O5 00 ND oo

Description

The invention relates to automation and is intended to control the synchronism of the rotation of the shafts, in particular the power drive of the tillage machines.

The aim of the invention is to simplify the detector.

The drawing shows a structural diagram of the detector.

The indicator contains pulse sensors 1 and 2, connected respectively to the master and slave shafts, one-shot 3 and 4, counter 5, element OR 6, alarm unit 7, the One-Vibrator 4 contains a resistor 8, elements OR-HE 9 and 10, a capacitor 11 The signaling unit 7 consists of resistors 12, 13, transistor 14 and emitting LED 15.

The detector works as follows.

During synchronous rotation of the shafts (the relative speed of their rotation is zero) the frequencies of the pulse signals at the outputs of pulse sensors 1 and 2 and one-shot are the same in 3 and 4. In this mode of operation, on the first OUTPUT meter, 5 pulses appear periodically. On the remaining output bits of the counter, 5 pulses are saved. O. The signaling unit 7 is turned off, indicating a synchronous rotation of the shafts.

If there is a mismatch in the speed of rotation of the shafts, t. when the driven shaft is skidding relative to the master, the frequency of the pulses at the output of the pulse sensor 2 decreases relative to the frequency of the pulses at the output of the pulse sensor 1. When the frequency decreases so that the ratio

T, -

where T "T 1

period of the pulse at the input R of the counter 5 period of the pulse at the input of the counter C 5j J - the duration of the pulse

In the one-shot 4, then in the second discharge of the counter 5 appears 1, which, having passed through the element OR 6, enters the control input of the one-time 4 and blocks its operation. As a result, it leaves the element SH-HE 10 and enters 13632812

The de R of counter 5 is set to signal 0. The output of the second discharge of counter 5 1 is preserved for a period of time 21, after which the output of this discharge is set to O, and the next discharge of counter 5 to 1, which through the OR element 6 continues to block the operation of the one-shot 4 during

time 4T. . As a result, a pulse of 6T duration (., Which enters the input of the signaling unit 7 and turns on the LED 15, which indicates the out of sync speeds of the shafts.) After setting O on the output of the OR 6 element, the blocking signal is removed from the control input of the one-vibrator 4 and the detector again goes into the next mode of operation, providing control of the synchronism of rotation of the shafts.

The indicator is useful for controlling the rotation of relatively low-speed shafts, the rotation frequency of which does not exceed 240 rpm, which corresponds to Tj, 0.25 s. In this case, the turn-on time of the LED 15 and the audio signal (not shown) is 6Tj. 1.5 s, which is enough to register an alert signal by the operator. In the case when the rotational speed significantly exceeds 240 rpm and it is necessary to increase the switch-on time of block 7, an OR 6 element with a large number of inputs is used, connecting them to the outputs of the subsequent bits of the binary counter 5. So, for example, the use of three-input the element OR 6 and the four-bit counter 5 provides for the output of the element OR 6 pulse with a duration of 14 Tc,

Using the proposed signaling device for monitoring shafts with a rotational speed not exceeding 60 rpm (T (, 1 s), it can be further simplified by eliminating the element OR 6. In this case, the control input of the one-shot 4 and the input of block 7 with the output of the second bit of the counter 5 (dotted line in the drawing), which provides a pulse at the input of the block 7 with a duration of 21.7 / 2s.

Claims (1)

Invention Formula The shaft rotary detector, containing the first and second pulse displacement sensors, the outputs of which are connected to the information inputs of the first and second one-vibration, respectively, the outputs of which are connected to the counter inputs, one editor E. Kopcha Compiled by M.Sidorova Tehred L. Oleinik Order 6366/44 Circulation 544Subscribe VNIIPI State Committee of the USSR 4 for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4 the stroke of which is connected to the first input of the OR element, the output of which is connected to the input of the alarm unit, characterized in that, in order to simplify the signaling device, another output of the counter is connected to the second input of the OR element, the output of which is connected to the control input of the second single vibrator. Proofreader V. But ha