RU2044315C1 - Scanning device for ultrasonic flaw detection of thin-walled pipes - Google Patents

Abstract

FIELD: nondestructive inspection. SUBSTANCE: mechanism of setting of fault finder is manufactured in the form of two carriages with bearing rollers placed in opposition to each other. Axles of bearing rollers of carriages are inter coupled by means of spring shock absorbers. Carriages are freely coupled with the help of guiding pins to rotary ring of body of bath which ensures reliable contact of bearing rollers with pipe, removal of carriages with fault finders for passing of corrugated section of pipe and for inspection at any point of joining. EFFECT: provision of high quality of inspection at any point of section, preservation of structural integrity of device under pronounced vibrations of pipe and formation of lateral waves on its surface. 2 cl, 3 dwg

Description

 The invention relates to indestructible testing of pipes manufactured in any industry, for example, in the production of metal sheaths of electric cables.

 Known scanning devices for ultrasonic flaw detectors for monitoring thin-walled pipes.

So in an ultrasonic flaw detector, three local baths, located after 120 ^о along the perimeter of the controlled section, are equipped with flat limiters, support carriages, which are pivotally connected to the supporting frame, which has guides, telescopic shock absorbers and adjusting rods, which complicates the design and does not allow monitoring in other section points [1]
The ultrasonic immersion flaw detector, which is the closest in technical essence to the invention, has a scanning device in the form of a cylinder with guide sleeves along which the controlled pipe slides [2]
The cylinder is suspended on springs from a housing filled with liquid baths and equipped with a holder for ultrasonic finders.

 This technical solution does not provide a stable distance between the finders and the pipe being monitored, since this distance varies within the gap between the pipe and the guide bushings. It is also impossible to apply this solution in conditions of complex movement of a thin-walled pipe, when sudden formation of corrugations (transverse waves) on its surface is possible.

 The aim of the invention is the expansion of technical capabilities, simplifying the design and improving the quality of control in conditions of high linear speeds of thin-walled pipes with significant runout, as well as maintaining the structural integrity of the device with a sharp increase in the outer diameter of the controlled pipe.

 This goal is achieved by the fact that in the known device, the installation mechanism of the finders is made in the form of carriages with support rollers, the axes of which are interconnected by spring shock absorbers, and the carriages themselves are connected by means of guide fingers to the rotary ring of the bathtub body.

 This solution allows us to ensure a stable position of the searchers relative to the controlled pipe when the pipe deviates from the nominal position, control at any points on the perimeter of the controlled section, as well as automatic retraction of the searchers in the event of a “collision” of the defect in the form of a corrugation.

 Figure 1 shows the proposed device, a General view with a partial section; figure 2 section aa in figure 1.

 The scanning device for ultrasonic flaw detection of thin-walled pipes has a bath 1 filled with contact liquid, the level of which is maintained in a known manner. On the front wall of the bath (from the input side of the controlled pipe 2), a ring 3 with a rotation drive 4 is installed, equipped with guide bushings 5, in the openings of which there are fingers 6, with guide bushings 7, freely sitting on the axes 8 of the carriages 9.

 Each carriage has two cheeks, between which on the axes 10 are rotatably supported rollers 11, holders 12, providing adjustment of the position of the finders 13 relative to the monitored pipe. The axes 10 are interconnected by springs 14. The centers of the axles 8 are somewhat offset from the axes 10.

 The device operates as follows.

 When you enter a controlled pipe 2, it, acting on the support rollers 11, pushes the carriage 9 and, accordingly, the searchers 13 apart.

 The springs 14, attracting the axes 10 to each other, provide constant contact of the support rollers with the pipe being monitored and thereby stabilize the position of the carriages with the finders fixed on them relative to the pipe.

 This contact is maintained during pipe vibrations, due to the possibility of both linear movement of the carriages along the axes 8 and fingers 6, and rotation around the latter.

 When a corrugated section is formed on a controlled pipe, the support rollers, passing to an increased shear wave diameter, also remove carriages with finders to an increased distance from the pipe.

 The control process is carried out in a known manner, while two diametrically located points of the pipe section are controlled.

 When the ring 3 is rotated by the actuator 4, any other points are controlled.

 Thus, the proposed technical solution allows a fairly simple means to improve the quality of control of any cross-sectional points in the complex movement of the pipe being monitored and to maintain the structural integrity of the device when shear waves are suddenly formed on its surface.

Claims (2)

 1. SCANNING DEVICE FOR ULTRASONIC DEFECTOSCOPY OF THIN-WALLED PIPES, containing a bath with contact liquid, finders, a mechanism for installing finders towards a controlled product, characterized in that the locating mechanism for finders is made in the form of two opposite carriages with support rollers, which are connected to one another by roller bearings with the help of axes and guide fingers with the bath body, and the axis of the support rollers are interconnected by spring shock absorbers.  2. The device according to claim 1, characterized in that the installation mechanism of the finders is connected to the body of the bath by means of a rotary ring.

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