SU930101A1 - Flaw detector device for blocking off article edges - Google Patents

Description

(5) DEVICE TO DEFECTOR FOR LOCKING EDGES OF THE PRODUCT

I

The invention relates to means of non-destructive testing and can be used in machine-building for the inspection of small-sized products, including edge zones.

A flaw detector with a device for blocking the edges of products is known, comprising a measuring transducer, a measuring block connected to its output, a blocking converter installed in front of the measuring transducer, connected to its output of a control unit, a prohibition unit, the first input of which is connected to the output of the control unit, and the second input the prohibition unit is connected to the output of the measuring unit, the actuator, whose input is connected to the output of the prohibition unit l.

The disadvantages of the known device are the change in the size of the blocking zone with variations in the speed of movement of products and the presence of

controlled area near the edge of the product.

The closest to the invention to the technical essence is a flaw detector device for locking the edges of the product, comprising a measuring transducer connected in series, a measuring unit, a comparison unit and a terminal unit, a blocking converter, a functional converter connected to it and a driver of exemplary signals, the output of which is connected to the second 2.J.

. The disadvantage of the device is the low reliability of the control, caused by the impossibility of detecting defects whose length is less than the blocking zone.

The purpose of the invention is to increase the reliability of the control.

The goal is achieved by the fact that the device is equipped with n threshold blocks connected between the functional converter and the driver of exemplary signals, the control unit, the outputs of which are connected to the inputs of the functional converter, measuring unit, driver of the exemplary signals and the third input of the block, and the converter interlocking is installed coaxially to the measuring transducer. The drawing shows the structures on the layout of the device to the flaw detector for blocking the edges of the product. The device contains serially connected measuring ave. the generator 1, the measuring unit 2, the comparison unit 3 and the terminal unit, the interlocking interlocking converter 5, the functional converter 6, the n threshold blocks 7-10, and forming 11 exemplary signals, the control unit 12, the outputs of which are connected to the inputs of the functional converter 6, measuring the generator 2 of the generator 12 exemplary signals and the second input of the comparison unit 3, the third input of which is connected to the output of the former of the 11 exemplary signals, and the blocking converter 5 is installed coaxially KSR Control converter 1. The apparatus operates as follows. The defect is detected by comparing the signals coming from the measuring unit 2, when passing through the measuring transducer 1 of the monitored product 13, with the signal stored in the unit 11 of generating exemplary signals. When these signals are equal, the product is evaluated as valid, with a difference an alarm signal is generated, including a cut-off mechanism in the completed block k. The principle of the invention is illustrated using a device based on the frequency eddy current non-destructive control method. The first operating cycle of the control unit 12 includes the measuring unit 2 (for example, a controlled oscillator), whose frequency depends on both the distance between the transducer 1 and the product 13, and the quality of the product fa. f (t) + y. In the absence of defects 0. Due to the fact that the duration of the signal received from control unit 12 is strictly fixed in duration, in comparison unit 3 (for example, a reversible counter) the number of pulses equal to N T is written By the second clock, control unit 12 grants permission for the operation of functional converter 6 (also controlled auto-oscillator). The mode of operation of the functional converter 6 is chosen in such a way that its output signal changes mainly only when the distance between the edge of the product 13 and the blocking converter 5 changes and practically remains constant when a defect appears. Depending on the distance between the edge of the product 13 and the blocking converter 5, a number of threshold blocks will be triggered, recording the facts of exceeding certain frequencies. Depending on the number of triggered threshold blocks, the driver of the 11 exemplary signals generates a certain frequency (1). In the third cycle of operation of the control unit 12, pulses, the number of which is equal to N- (E) -, T, arrive at the second input of the comparison unit 3 (subtracting the input of the reversible counter) from the block 11 of the former of exemplary signals. As a result, in block 3 of the comparison, information remains that characterizes the quality of the products N TG (B) + L - T (E), j Tb, since the frequency of the block 11 exemplary signals on the basis of experiments is set equal to (E) (6). 12 control permits analysis of the state of unit 3 comparison. If there is a defect on the monitored item L: O and & H F O in block 3 comparison, in addition to the subtraction operation (uN, the information remaining in the reversible counter after subtraction is also compared with the allowable number of pulses. Inequalities / DN / LNдon An alarm signal is given to the terminal block C, which signals the presence of a defect.

Claims (1)

Claim A device for a flaw detector for locking the edges of the product, comprising a measuring transducer, a measuring unit, a comparison unit and a terminal block, a locking transducer, a functional converter and an example signal generator connected to it, the output of which is connected to the second input of the comparison unit, characterized in that that, in order to increase the reliability of control, it is equipped 93RYU1 6 η threshold blocks connected between the functional converter and the reference signal generator, the control unit, the outputs of which are connected to the inputs of the functional converter _{t of the} measuring block, the reference signal generator and the third input of the comparison unit, and the locking converter 10 is installed coaxially to the measuring converter.