SU1265581A1 - Flaw detector for checking rolled stock - Google Patents

Abstract

The invention relates to non-destructive testing during rolled stock inspection. The aim of the invention is to improve the reliability of the selection of defects by changing the design of the scheme: selection of defects. The flaw detector contains a primary converter connected in series, a defect signal generator, and a selection circuit and synchronizer. The selection circuit contains the first counter connected in series, the input of which is connected to the synchronizer, the second counter and the first trigger, the output of which is the output of the selection circuit, and the third counter connected in series, the input of which is connected to the defect driver, the second trigger and the fourth counter, output which is connected to the inputs of the R-flip-flops. When the flaw-detector is in operation, by selecting the coefficient (the counts recalculation counter, the presence of a coarse extended defect and the determine the maximum allowable length of minor defects o 1 ill. o: cd cd 00

Description

The invention relates to the field of non-destructive control and can be used in the metallurgical and machine-building industry for the defectoscopy of rolled products (rails, rods, bars, sheets, pipes, and so on). The aim of the invention is to improve the reliability of the selection of defects by changing the design of the cxei-tbi defect selection. The drawing shows the functional diagram of the hire inspection detector. The flaw detector contains a primary converter 1 connected in series, a defect signal generator 2 and a selection circuit 3, and a synchronizer 4 connected to the second input of the selection circuit 3. Scheme 3 of the section contains a serially connected counter 5, the input of which is connected to the synchronizer 4, the counter 6 and a trigger 1 whose output is with the output of the selection circuit 3 and the serially connected counter 8 whose input is connected to the driver 2 defect signals, the installation input connected to the output of the counter 5, and the output is connected to the installation inputs of counters 5 and 6, trigger 9 and the counter 10, the output of which is connected to the E-inputs of the trigger 7 and the second input is connected to the synchronizer 4. The counting coefficient of the counter 5 is t, tchik 8 - k, the counter 6 p and the counter 10 - t-Po The flaw detector works as follows. The primary transducer 1 monitors the moving circuit 11 o Synchronizer 4 and clocks fc. If there is no defect, the primary transducer 1 generates no defect signals, which are processed by the transducer 2 defect signals and pass to the counting input of the counter 8. If there is a coarse, continuous the length of the defect signals to the counter 8 are not received. In many cases, internal rental defects have a preferred length, which with a certain degree of accuracy can be determined statically according to the control data for a specific type of rental. It is 1 a and usually expressed as a percentage of the length of the distribution. The coefficient m of the counting of the counter 5 corresponds to the conventional unit length of the defect expressed by the value - V, where V is the velocity by the path L ,. Controlled rolling stock The coefficient K of the counting of the counter 8 corresponds to the conditional unit length of the absence of a defect (without an effective section), expressed as a value. - V envy. Attitude is a selectable (according to statistics) percentage of defect free, i.e. LQ / L, usually kifflo. When a defect appears, counter 5, udui is open on the installation input with a zero output potential from the counter output (since counter 8 does not receive a pulse without a defect), counts the synchronization pulse to its counting input and issues every 10 pulses a signal about the presence of a defect with a length Lg in the monitored section of the rental 11. This signal, after each successive mth clock pulse, sets the zero state to zero and is counted by counter 6, i.e. the counter 6 counts with the division value L ,, the extent of the defect. At the end of the defect, there are impulses of the absence of a defect, which are considered to be counter 8 with step K, i.e. After every K pulses, the counter 8 generates a signal that there is no defect in the monitored section of length Lga o This signal sets the counter to the zero state 5 and clears the counter 6. The counter count coefficient n is selected from the condition of the minimum length defect selection, the rejection value, and is equal to .iSJlstL. Due to the need to select a defect with an extension greater than dmin, the beginning of its registration is delayed by L Therefore it is necessary to delay by the same amount (the end of registration. With this output from the output of the counter 8 without defect, the pulses with step K are fed to the S input trigger 9.

A trigger 9 with a high potential of its output gives permission for the counting of clock pulses to the counter 10, the counter counting coefficient of -10 equals ha p, which ensures a delay in the completion of the registration of a defect by the value of m-n-V

Counting the given

j min

the number of synchronization pulses, the counter 10 generates a pulse on the R inputs of the triggers 7 and 9, thereby prohibiting itself the account and terminating the registration of the defect.

The clock frequency can be high, which significantly reduces the step time. the length of the defect that

T - 5L f.

equals 0 - -,

and those1 to increase

 1s

the accuracy (also reliability) of the release of the rejected defect,

The minimum length of the defect that needs to be selected can be specified in a wide range of values by choosing the coefficient n of the counting counter 6, since it is equal to b "Pb" about 9 minutes

A positive quality of the selection scheme is also that it allows for detuning from interfering factors (for example, the local perishability of a defect or similar in its effect the appearance of an impulse of interference) with a probability equal to k / m, which can be regulated within wide limits beyond score

selection of the coefficients of the k and m counters 8 and 5,

Claims (1)

Invention Formula A flaw detector to control the rental, containing a primary converter connected in series, a defect driver and a selection circuit, and a synchronizer connected to the second input of the selection circuit, characterized in that, in order to increase the reliability of the selection of defects, the selection circuit is made in the form of middle sequential first counter whose input is connected to the synchronizer, the second counter and the first trigger, the output of which is the output of the selection circuit, and connected in series to the third with An emulator whose input is connected to the signal conditioner about defects, an installation -input is connected to the output of the first counter, and the output is connected to the installation inputs of the first and second counters, the second trigger and the fourth counter, the input of which is connected to the synchronizer, and the output to the R inputs triggers, counters are made with an adjustable counting coefficient, the counting coefficient of the fourth counter is equal to the product of the counting coefficients of the first and second counters, and the counting coefficient of the third counter is less than the counting ratio of the first counter.