RU1825964C - Eddy current superposed transducer unit - Google Patents

Abstract

The invention relates to eddy current control of materials and products and can be used to convert the parameters of an object of control into electrical signals. The purpose of the invention is to simplify operation, expand the scope of use and increase the reliability of eddy current control. The goal is achieved due to the fact that the eddy current overhead transducer block containing a cylindrical frame, at least one winding placed on it, a coil spring covering the frame, a sleeve spring-loaded along the frame axis, and a limit switch for the lower position of the sleeve is provided with a non-magnetic case in the form of a glass, to the bottom of which a frame is attached, fixed in the sleeve by a cup of ferromagnetic material, in the bottom of which a conical hole is made coaxial to the frame, and the edge has an inner collar, and with a limit switch of the upper position of the sleeve, the cylindrical frame is made of a magnet of soft ferromagnetic material and has a conical tip interacting with the conical opening of the cup, and a cylindrical spring is installed between the bottom of the cup and the collar of the cup. 1 ill. 00 00 ел ел «o och -N

Description

The invention relates to non-destructive testing and can be used in measuring parameters of substances, materials and products by the eddy current method.

The purpose of the invention is to simplify operation, expand the scope of use and increase the reliability of control.

The drawing shows a diagram of the proposed Converter.

The converter comprises a cylindrical frame 1 made of a magnet of a soft ferromagnetic material, on which, for example, one or more windings 2 of an overhead current transducer is fixed in its groove. Frame

1 has a conical tip 3 and is rigidly coaxially attached to the bottom of a non-magnetic housing 4 in the form of a glass. The device also contains a cup 5 of material similar to the material of the frame 1. Cup 5 has an inner collar 6 and a conical hole 7 in its bottom, mating with a conical tip 3, Cup 5 is fixed in the inner cavity of the sleeve 8, which is mounted with axial movement case 4. A spacer elastic element 9, for example, a coil spring covering the winding frame, is placed between the bottom of the case 4 and the end surface of the cup 5 closest to it. Limit switches are fixed on the inner surface of the sleeve 8: 10 - no bottom and 11 top position. A plate 12 is fixed in the wall of the housing 4, passing through a longitudinal window 13 in the wall of the sleeve 8.

The drawing also shows the surface 14 of the object of control, F - clamping force.

The converter operates as follows.

The eddy current overhead transducer block is installed with the free end of the sleeve 8 on the surface 14 in the studied area. Under the action of the force of the spacer element 9, the device is in the initial (calibration) position, when the conical surfaces of the tip 3 and the cup 5 are controlled between each other, the limit switch 11 under the influence of the plate 12 is in the open (closed) state, and the limit switch 10 free from the effects is in a closed (open) state.

In the initial state, identified by the state of the limit switches 10 and 11, the signal (s) of the winding (s)

2 is practically independent of the electrophysical properties of the test object and is determined only by the parameters and modes of the eddy current transducer itself, because windings 2 are removed from the surface 14 of the test object, in addition, windings 2 are shielded from the test object due to the closure of the magnetic circuit: cylindrical frame 1 is conical tip 3 - cup 5.

These signals are calibration signals. They are entered into the information processing unit of the corresponding eddy current monitoring means (e.g., conductivity meter, thickness gauge, structuretroscope, etc.) and are stored. Then, a force F is applied to the housing 4, which puts the device in the final (measuring) position when:

1) windings 2 are as close as possible to the surface 14 of the control object;

2) the magnetic circuit is open.

This state is identified by the closed (open) state of the limit switch 12 and the open (closed) state of the limit switch 10.

In the measuring position, components are present in the signals of the windings 2, and

entered by the control. The processing of these signals in the information processing unit together with the previously obtained calibration signals makes it possible to extract with high accuracy the required measurement information signals from the signals of the windings 2,

The objectives of the invention are achieved due to the fact that both calibration and measuring signals are received directly at the measuring position when the surface eddy current transducer block is in contact with the surface of the test object, as well as due to the identification of both calibration and

measuring positions.

Claims (1)

SUMMARY OF THE INVENTION Eddy-current overhead transducer block containing a cylindrical a housing, placed on it by at least one winding, a coil spring spanning the frame, a sleeve spring-loaded along the axis of the frame, and a limit switch for lowering the position of the sleeve, characterized in that, in order to simplify operation, expand the scope of use and increase the reliability of the eddy current control, it is equipped with a non-magnetic casing in the form of a glass, to the bottom of which a frame is attached, fastened in the sleeve with a cup of magnetically soft ferromagnetic material, in the bottom of which a conical hole is made coaxial to the frame, and the edge has inner collar, and the limit switch of the upper position of the sleeve, the cylindrical frame is made of soft magnetic ferromagnetic material and has a conical tip that interacts with a conical opening of the cup, and a cylindrical spring is installed between the bottom of the cup and the collar of the cup.