SU1675781A1 - Speed measuring device - Google Patents

Abstract

The invention relates to the measurement and control of the motion parameters of production mechanisms, in particular the traction body of the elevator, and is intended to measure the magnitude of the velocity. The purpose of the invention is to increase reliability. The pulses from the primary sensor 1 through the noise protection unit 2 are fed to the input of the control unit 3. The counting unit 5 provides a measurement of the speed of the elevator body in two modes: for the time interval and for the turnover of the body. The digital comparator in these modes provides a comparison with the setup code and the formation by block 3 of the control signal for the end of the measurement interval. Based on the readings of the first and second counters of the counting unit 5, the measured speed value is determined, 4 sludge.

Description

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The invention relates to the measurement and control parameters of the movement of production mechanisms, in particular the traction body of the elevator.

The aim of the invention is to increase the reliability of the device when measuring the speed of movement of the traction body of the elevator, expanding the functionality.

Figure 1 shows the block diagram of the device; figure 2 is a functional diagram of the block protection from interference; FIG. 3 is a functional diagram of a flea control; figure 4 is a functional block diagram of the account.

The device for measuring speed contains a transducer pulse sensor 1, an anti-interference block 2, a control block 3, a reference frequency generator 4, a count block 5, the output of the pulse sensor 1 is connected to the input of an anti-noise block 2 whose output is connected to the first input of the control unit 3, the second input of which is connected to the output of the counting unit 5, the output of the generator 4 of the reference frequency is connected to the first input of the counting unit 5, the second and third inputs of which are connected to the first and second outputs of the control unit 3, respectively.

Pulse sensor 1 contains readout

elements 6i, 62by (where N is in advance

given number) and the element OR 7, while the reading elements b1, b2, ..., 6m are placed with the same step w (where Cq is the width of the bucket 8 on the lifting body 9 of the elevator) along the driving body 9 located on the driving the drum 10, the outputs of the reading elements 61,62

combined according to the OR scheme at the output of the pulse 1 sensor.

Block 2 protection from interference contains a four-time generator 11, RS-flip-flops 12 and 13, elements AND-NOT 14-16, element NOT 17, while the input of block 2 protection against interference is connected to the first inputs of the elements AND-NOT 14 and 16 and c the input element HE 17, the output of which is connected to the third input of the element 15 NAND, the output of the element NAND 14 is connected to the R input of the trigger 12, the direct output of which is connected to the second input of the element IE NOT 16, and the inverse output - with the first input of the element AND-NOT 15, the outputs of the elements AND-NOT 15 and 16 are connected by the corresponding W and R inputs of the trigger 13, the direct output of which is output unit 2 are protection against interference.

The first, second, third and fourth outputs of the four-contact generator 11 are connected respectively to the second output of the element AND-HE 14 with the S input of the trigger 12, with the third input of the element EH E 16, with the second

the input element AND-NOT 15. The control unit 4 3, for example, contains an RS-flip-flop 18, element And 19, while the first input of the control unit 3 is connected to the S-input of the trigger

18w, the first input of the AND element 19, the output of which is the first output of the control unit 3, the second input of the unit 3 connected to the R input of the trigger 18, the direct output of which is connected to the second input of the AND element

19 and is the second output of the control unit 3,

The counting unit 5 contains counters 20 and 21, the first 22 and second 23 groups AND, the group of elements OR 24, the measurement mode setting unit 25, the measurement interval setting control 26, the digital comparator 2 7,

The proposed device for measuring speed operates as follows.

When the power is turned on, the triggers 12, 13 and 18, the counters 20 and 21 are reset in any known manner to their original state. At the same time, at the direct outputs of the flip-flops 12, 13 and 18 and at the outputs of the counters 20 and 21 there is a potential of logical O, and at the inverse output of the trigger 12 of the potential of logical 1, the generator 4 of the reference frequency generates pulses; TIZ, TI4, uniformly shifted in time, with TI4 inverted relative to TI1, TI2, TIZ, and the clock frequency of following TI1, TI2, TIZ, TI4 is much higher than the frequency of the signals from the sensor

1 IMPULSE.

When the drive is turned on, the drum 10 rotates, while the drag organ 9 and the buckets B move along the read (sensitive) elements 6i.6i, ..., 6n of the speed converter into the number of pulses.

When finding the bucket 8 opposite the reading element 6 (I 1,2N) on its

The output has a signal 1, and in the absence of a bucket 8 opposite the reading element 6i, its output is a signal O. If there is a signal 1 at the output of at least one reading element 6 | At the output of the element OR 7 and at the output of the sensor 1 pulses there is a signal 1. As the step of placing the buckets 8 on the traction body 9 is equal to the step of placing the reading elements 6 |, then if the number of consecutive missing buckets 8 is less than N, the signal G at the output of the converter along Wits when the bucket 8 is located opposite the reading element 6 |.

The signals from the pulse sensor 1 are fed to the input of the noise protection unit 2, which performs their digital filtering against interference. Received signals from the block output

2 protection from interference is received at the first input of the control unit 3.

The first signal G arriving at the first input of block 3, the trigger 18 is transferred to a single state, and the signal G (Resolution Resolution) appears at the second output of block 3, and the first output 3 shows the noise protection unit 2 passing through the element 19. When signal 1 arrives at the second input of the control unit 3, the trigger 18 is reset and the signal 1 disappears at the second output of the control unit 3.

The signals from the generator 5 of the reference frequency and from the first and second outputs of the control unit 3 are received respectively at the inputs of the first and second counters (20,21), of the counting unit 5.

The invoice unit 5 operates in the Measurement in the time interval mode, Measurement per turnover of the traction body. In the Measurement mode, in the time interval, the first output of the mode generator 25 has a signal G, and the code of the number N20 pulses accumulated in the counter 20 through the groups of elements AND 22 and OR 24 is fed to the first input of the digital comparator 27, at the output of which signal G at

N20 №bi.v,

where #b.in is the number given out by the unit 26 of the measurement interval in the Measurement mode in the time interval.

At signal 1 at the output of digital comparator 27, the signal of resolution is removed at the second inputs of counters 20 and 21, they are reset and the speed V is determined by Ki N21

V

K2 N20

where Ki is the proportionality coefficient, which translates the number of N21 pulses in the counter 21 into the path traveled by the traction authority 9 during the measurement time (i.e. during the counting time with the counter 20 of the number of N20 pulses);

K2 - proportionality factor for translation into the measuring interval of a number;

Nai - the number of pulses accumulated in the counter 21 ..

In the Measurement for the revolving of the govine body mode, signal 1 is present at the second output of the setpoint 25, and the code

The number of Nai mmpulsosis accumulated in counter 21 through groups of elements And 23, OR 24. It enters the first run of the comparator 27, at the output of which a signal 1 appears at

  N26.0,

where М2б, о-h islo, issued by the setting device 26 in the Measurement mode for the turnover of the traction body;

N26.0 Ng,

where NS is the number of buckets 8, which is placed on the rod 9.

Thus, by introducing the two elements AND, the OR element, the measuring mode driver, it is possible to measure the speed of the traction organ both in a certain time interval and in one full turn of the traction organ.

Claims (1)

The invention The device for measuring the speed, containing a pulse sensor, a reference frequency generator, a control unit, a counting unit performed on the first and second counters, the output of the pulse sensor is connected to the first input of the control unit through the noise protection unit, the output of the reference frequency generator is connected to the first input of the first synchronization unit of the counting unit, the second input of which is connected to the second input of the second counter of the counting unit and to the second output of the control unit; the first output of the control unit is connected to the first input The second counter of the counting unit, characterized in that, in order to increase reliability, a digital comparator is additionally introduced into the counting unit, the output of which is connected to the second input of the control unit, the measuring mode controller, the first and second groups of elements AND, the group of elements OR, the outputs of both groups And elements through the group of elements OR are connected to the second group by the input code bus of the digital comparator, the outputs of the first and second counters are connected to the first inputs of the first and second groups of elements And, respectively, the second outputs to The sensors are connected to the first and second outputs of the setting meter of the measurement mode, and the pulse sensor is made in the form of at least two reading elements arranged at the same distance combined according to the OR circuit.