SU759946A1 - Device for automatic rejecting of tubes - Google Patents

Description

The invention relates to the field of non-destructive testing and can be used for automatic screening of pipes in the line of transverse cutting of long pieces. five

A device for automatic screening of pipes in metal cross-cutting lines is known, comprising a memory unit, a shift register, a time delay unit of the U signal, a pipe edge sensor, a tachogenerator and an actuator

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A disadvantage of the known device is the low accuracy of rejection, which is caused by indirect measurement of the speed of movement of the pipe through the speed of the transport mechanism.

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The closest to the invention to the technical essence is a device for automatic screening of pipes in a cross-cutting line, containing in series 25 connected defectoscope, a memory unit, a shift register and an actuator, as well as a pipe edge sensor and a time delay signal unit [2]. thirty

2

However, this device does not provide the required! accuracy, rejection, as the speed of movement of the pipe is not directly measured.

The purpose of the invention is to improve the accuracy of the screening.

This goal is achieved due to the fact that the tube edge sensor through the time delay unit of the signal is connected to the clock input of the shift register, the output of which is connected to the actuator, and the time delay unit of the signal is made in the form of serially connected sawtooth generator, peak detector, large-scale converter and comparator , the second input of which is connected to the output of the sawtooth generator.

FIG. 1 shows a diagram of the proposed device ;, FIG. 2 diagram of the time delay of the signal.

The flaw detector 1. is connected to the memory unit 2, the output of which is connected to the counting input of the shift register 3. The output of the sensor 4 of the pipe edge through the block 5 of the signal time delay is connected to a clock

759946

the input of the shift register 3, the output of which is associated with the executive '

'‘“ "Т Т Т Т Т Т 6 by discharge 6

pipes 7.

Block 5 time delay signal contains a generator 8 sawtooth voltage, the input of which is connected to the output of the sensor 4 edges of the pipe, connected in series to the peak detector 9 and the large-scale converter 10 connected to the generator 8 of the sawtooth voltage, and a comparator 11 connected by one input to the large-scale output Converter 10, the other input to the output of the generator 8 sawtooth voltage, and the output to the clock input of the shift register 3.

The device works as follows.

A pipe 7 · 'of infinite ¹ ' length moves along the rolling table through the primary transducer of the flaw detector 1. When a defective pipe section passes, at the flaw detector output a signal '' appears, which is transmitted to memory block 2. ' ¹ Infinite' ¹ pipe is cut into segments of finite length that pass through the sensor 4 of the pipe edge and move to the drop point. The sensor 4 of the pipe is installed at a distance from the flaw detector 1 more than the length of one pipe, therefore the output signal of the pipe edge sensor is delayed by the unit 5 time delay of the signal at the time of passage of the pipe section, equal to the addition to the distance between the flaw detector sensor and the pipe edge sensor to two pipe lengths. Output signal from block 2

‘Memory is fed to the counting input of the shift register 3, is advanced to the output of the register pulses

> coming from the output of block 5 of the time delay of the signal to the clock input of the shift register, and the output signal of the latter controls the operation of the actuator b.

'With the passage of the beginning of each pipe through the sensor 4, the edge of the pipe produces signals that are fed to the input of the generator 8 sawtooth voltage. After the end of the input pulse, the output voltage of the generator 8 begins to increase linearly until the next pulse comes on * and reaches the voltage I ". During the input pulse time, the voltage

, at the output of the generator drops to zero, and after the end of the input pulse, the cycle repeats. The output of the generator 8 is supplied simultaneously to the peak detector 9 and to one input of a comparator 11. The IE peak detector 9 is stored the maximum value of the output voltage generator 8 and is fed to the input of the scale converter 10 and the output voltage of the latter is obtained and is directly proportional to voltage _op u_

the conversion factor of the Converter 10, which is fed to another input of the comparator 11.

At the time of reaching the linearly varying input voltage of the generator 8, voltage 1! _0π at the output of the comparator 11, a signal appears, delayed relative to the output signal of the sensor 4 of the pipe edge, which is fed to the clock input of the shift register 3.

From the above it follows that the maximum voltage and _t at the output of the generator 8 is proportional to the speed of movement of the pipes, thereby eliminating the error in the marking of the pipes, since the influence of the slip on the results of the screening is excluded.

Claims (1)

Claim A device for automatic tube screening in a cross-cutting line, containing a series-connected flaw detector, a memory unit, a shift register and an actuator, as well as a pipe edge sensor and a signal time delay unit, characterized in that, to improve the accuracy of the screening, a pipe edge sensor through the time delay unit of the signal is connected to the clock input of the shift register, the output of which is connected to the actuator, and the time delay unit of the signal is made as a serial connection Interstate generator sawtooth voltage, peak detector, scale converter and comparator, the second input of which is connected to the output of the sawtooth generator.