SU551555A1

SU551555A1 - Overhead eddy current transducer block

Info

Publication number: SU551555A1
Application number: SU2079724A
Authority: SU
Inventors: Евгений Александрович Князев; Татьяна Андреевна Сосницкая; Вячеслав Леонидович Байдаков; Владимир Владимирович Шестопалов
Priority date: 1974-11-29
Filing date: 1974-11-29
Publication date: 1977-03-25

Description

(54) БЛОК НАКЛАЩЫХ ТОКОВИХРЕВЫХ ПРЕОБРАЗОВАТЕЛЕЙ(54) BLOCK OF EXTENDED CURVE CONVERTERS

1one

Изобретение относитс к средствам неразрушающего контрол материалов и изделий и может быть использовано в структуроскопах дл контрол и испытани металлических изделий.The invention relates to non-destructive testing of materials and products and can be used in structure microscopes for monitoring and testing metal products.

Известны блоки накладных токовихревых преобразователей, содержащие П-образные магнитопроводы, поверхности полюсов которых расположены в параллельных плоскост х , возбуждающие и измерительные обмотки , обхватывающие эти магнитопроводы.Blocks of overhead eddy-current transducers are known, containing U-shaped magnetic cores, the surfaces of the poles of which are located in parallel planes, the exciting and measuring windings encircling these magnetic circuits.

Однако достоверность контрол электропроводных материалов при наличии прот женных дефектов известными блоками недостаточна , так как магнитопроводы не crpyn пированы с учетом значений раскрыти дефектов , а расположение обмоток не соответствует требовани м максимальной чувствителыюсти к указанным дефектам.However, the reliability of the control of electrically conductive materials in the presence of extended defects by known blocks is insufficient, since the magnetic cores are not crpyn based on the values of the opening defects, and the arrangement of the windings does not meet the requirements of maximum sensitivity to these defects.

Целью изобретени вл етс повыщение достоверности контрол прот женных дефектов электропроводных материалов, дл чего магнитопроводы сгруппированы попарно и установлены друг за другом в направлении, перпендикул рном к траектории контрол , The aim of the invention is to increase the reliability of monitoring extended defects of electrically conductive materials, for which the magnetic cores are grouped in pairs and arranged one behind the other in a direction perpendicular to the control path,

кажда возбуждающа обмотка обхватывает смежные полюса одной группы, между которыми расположена измерительна обмотка, оси измерительных обмоток параллельны друг другу и поверхности полюсов, а оси групп магнитопроводов смещены относительно друг друга в направлении траектории контрол на величину, превыщающую максимальное раскрытие дефекта.each exciting winding encloses the adjacent poles of the same group, between which the measuring winding is located, the axes of the measuring windings are parallel to each other and the surface of the poles, and the axes of the groups of magnetic conductors are offset relative to each other in the direction of the control trajectory by an amount exceeding the maximum opening of the defect.

На фиг. 1 изображен предложенный блок преобразователей вид сбоку; на фиг. 2 - ви сверху.FIG. 1 shows the proposed unit of transducers side view; in fig. 2 - view from above.

Он содержит П-образные магнитопроводы 1, 2, 3, 4. На каждой паре магнитопроводов , например на 1-2 и 3-4, закреплены обмотки возбуждени 5 и 6 соответственно, так, чтобы между магнитопроводами были образованы зазоры 7 и 8. В нижней части зазоров 7 и 8 на направл ющих 9 и 1О закрепл ютс измерительные обмотки 11 и 12 так чтобы они были размещены в нулевых зонах между полюсами магнитопроводов.It contains U-shaped magnetic cores 1, 2, 3, 4. Each pair of magnetic cores, for example 1-2 and 3-4, have excitation windings 5 and 6, respectively, so that gaps 7 and 8 are formed between the magnetic cores. The lower part of the gaps 7 and 8 on the guides 9 and 1O are fixed measuring windings 11 and 12 so that they are placed in the zero zones between the poles of the magnetic circuits.

Claims

To check the correctness of their location, alternating current is supplied to the windings 5 and 6 and the EMF is measured in windings 11 and 12. The zero EMF in these windings indicates the correct location of the latter. The windings 11 and 12 are fixed in place with respect to the magnetic cores by means of guides 9 and 1O or by any other means. Through the pads 13 and 14, a pair of magnetic cores is fixedly connected between them. The plates are made so that between adjacent active planes of measuring windings 11 and 12 there is a distance H, 11 FG Oi greater than the minimum value O, open the cracks (hairs). Winding 5 and 6 are connected according to and in series and connected to an alternator (not shown in Fig.). The measuring windings are connected to the corresponding signal recorders (not shown in FIG.). The transducer block operates as follows. When it interacts with a controlled material (with defects), signals appear in the measuring windings. As a result of all-phase analysis of the latter, the parameters of defects are determined. It should be noted that variants of the block with a large number of magnetic conductors and, respectively, exciting and measuring windings are possible. Instead of measuring windings, other magnetic field indicators, including galvanomagnetic ones, can be used. Claims An overlap eddy current transducer block containing rigidly connected U-shaped magnetic cores, the surfaces of the poles of which are arranged in parallel planes, exciting and measuring windings, characterized in that, in order to increase the reliability of checking for elongated defects of electrically conductive materials, the magnetic cores are grouped in pairs and one after another in a direction perpendicular to the path of the control, the exciting winding encompasses the adjacent poles of one group, between otorrhea located measuring coils, measuring coils axis are parallel to one another and the pole surface, and relative to one another in the direction of the trajectory control groups axis magnetic circuits are offset by an amount prevyschayuschuyu maximum defect disclosure.