CS259558B1 - Device of coaxial conduit of inner passage for testing of tubes by eddy current method - Google Patents

Abstract

The device solves the design of coaxial guidance of the internal through-hole probe for testing pipes by the eddy current method. Guide sleeves with flexible fibers enable smooth sliding movement of the probes while ensuring coaxial guidance. The device is suitable for testing heat exchange pipes of energy equipment.

Description

The invention relates to a coaxial guiding device of an internal through probe for eddy current tube testing.

Previously known internal through probe designs use guiding elements such as circumferential bristles, finely toothed slats, and compact axial split moldings to ensure coaxial movement of the probes within the tubes.

A disadvantage of these solutions is that the required coaxial guidance of the probes within the tubes during testing is associated with a relatively high level of friction with the active guide elements and the inner tube wall. As the wear of the guide elements increases, the wiring accuracy decreases, which reduces the reliability of the measured signal analysis and shortens the life of the probes. The increased wear of the guide elements is related to their construction, mainly due to their directional orientation and low flexibility. In the case of peripheral bristles and slats, their orientation is perpendicular to the direction of movement of the probe, which increases the intensity of wear due to the tipping of the active elements during reverse movement of the probe. In the case of guide bushes, increased wear is highly dependent on the rigidity (elasticity) of the compact moldings of plastics.

The solution according to the invention eliminates the disadvantages of the prior art.

8

The eddy current coaxial conduit probe coaxial guiding device is characterized in that the guide bushings mounted on the springs are equipped on the circumference with rows of radial openings into which elastic fibers are wound parallel to the bushing axis.

The advantage of the proposed probe design lies in the fact that the active elements that provide coaxial guidance of the probe are oriented in the direction of movement of the probe, which significantly reduces the friction between the probe and the inner tube wall and thus wear of the guiding parts of the probe. The proposed method of construction allows for a smooth, sliding movement of the probe within the tubes in both directions without increasing the wear rate of the reverse movement.

The design of the coaxial probe construction according to the invention is shown in FIG. 1. A detail of the guide sleeve is shown in FIG. Second

The probe consists of springs 7 on which the insertion cone 2, the body of the slider 3, the guide sleeve 4, the body for attaching the protective tube 5, the protective tube 6 are mounted. The guide sleeves 4 have two rows of radial holes 8 circumferentially. flexible fibers 9 wound with the axis of the sleeve ensuring coaxial guidance of the probe in the test tube 1.

Claims (1)

Device for coaxial guiding of the internal through probe for eddy current testing of pipes, characterized in that the guide sleeves (4j) mounted on springs BACKGROUND OF THE INVENTION (7) are provided on the circumference with rows of radial openings (8) into which elastic fibers (9) are wound parallel to the axis of the housing.