RU114163U1 - DEVICE FOR ULTRASONIC CONTROL OF RING WELDED CONNECTIONS BY MANUAL LONGITUDINAL-CROSS-SCAN - Google Patents

Abstract

A device for ultrasonic testing of circular welded joints by manual longitudinal-transverse scanning, containing a longitudinal guide, a carriage mounted on the guide, an additional guide fixed on the carriage perpendicular to the main guide, a slider interacting with an additional guide, a transducer with a clamping device fixed on the slider, which is different in that it is equipped with a second additional guide, fixed in the carriage parallel to the first additional guide, with a knurled lead screw installed in the carriage parallel with additional guides, with the possibility of rotation around its own axis, and interacting with the slider, while a retainer is placed in the knurled head of the lead screw in the form of a rod, pressed by a spring to the wall of the carriage, in which a spherical recess is made, and linear scales are applied to the side walls of the carriage, the main guide is an arcuate plate with a longitudinal window through which the prismatic transducer contacts the surface of the input-reception of ultrasonic vibrations into the welded joint of the product, a degree scale is applied to one of the side walls of the main guide, and the other is equipped with side lugs for attaching it to this guide to the side legs of the shroud half-rings applied to the outer cylindrical surface of the product and bolted together with each other.

Description

The utility model relates to the field of ultrasonic quality control of welded joints, in particular to the control of butt butt welded joints made by electron beam welding, it is intended for use in products in the form of bodies of revolution made of non-magnetic materials, and can be widely used in various industries .

A device [1] is known for ultrasonic testing of welded joints by longitudinal-transverse scanning, comprising a guide, a carriage, a rod movably mounted on the carriage, and a transducer with a clamping mechanism mounted on the rod, an axis mounted on the carriage with the possibility of rotation, rigidly installed on it the disk and the gear and the stops mounted on the guide and interacting with the program disk during the control, and the rod is made in the form of a gear rack, which engages with the gear.

The device has serious drawbacks. It is not intended for ultrasonic testing of longitudinal welded joints of parts made of magnetic materials and is not suitable for inspection of ring welded joints of products made of non-magnetic materials. The clamp mechanism of the transducer and the attachment points of the longitudinal guide are made of magnets. The transverse mechanism of the transducer, made in the form of a gear rack and gear, engaged with each other, has low accuracy characteristics of the transducer movement, which are not suitable for determining the depth of detected defects. The software disc with the petals is complex in design and manufacture. A set of discs is required to control welds of varying thicknesses.

Another device [2] for ultrasonic testing of welded joints is also known, comprising a guide with end stops, a trolley (carriage) mounted on the guide, an additional guide mounted on the carriage perpendicular to the main one, a slider interacting with an additional guide, a vertical stand mounted on the slider , an inclined (prismatic) finder (transducer) with a clamping device, mounted on a slider, while the end stops of the longitudinal guide are made in the form of a layer us with serrated teeth of different width defined by the scanning step.

This device has a simpler design and manufacturing technology in comparison with the previous device due to the lack of software disks in it. However, it retains a number of other disadvantages of the previous device and has its drawbacks. The clamping mechanisms of the transducer and the fastening of the longitudinal guide are made of magnets and the device is intended only for controlling welded joints of structural elements made of magnetic materials. The stops of the longitudinal guide in the form of a plate with sawtooth teeth of different widths have low accuracy characteristics of the transverse movement of the ultrasonic transducer. In addition, these teeth at the beginning and at the end of the longitudinal movement of the transducer create additional uncontrolled zones of the welded joint during ultrasonic testing. The device is not intended to control ring welds.

Despite the disadvantages, the closest analogue in design to the proposed utility model is a device with an additional guide mounted on the carriage perpendicular to the main one. Therefore, it is taken as a prototype.

The objective of the proposed utility model is to create a device for ultrasonic quality control of annular welded joints of products made in the form of bodies of revolution from non-magnetic elements, ensuring lateral movement of the prismatic transducer with a constant step, eliminating uncontrolled zones at the beginning and end of longitudinal movement, reading angular and transverse coordinates detected defects, mounting a longitudinal guide on the cylindrical surface of the product along the welded joint without and use of magnets.

The problem is solved as follows.

The device is equipped with a second additional guide mounted in the carriage parallel to the first additional guide, a spindle with a knurled head, mounted in the carriage in parallel with the additional guide with the possibility of rotation around its own axis, interacting with the slider through the clamping device with a prismatic transducer. The main guide is made arcuate with a longitudinal window through which the transducer is in contact with the input-receiving surface of ultrasonic vibrations into the product. In this case, the main guide is equipped with a degree scale for reading angular coordinates and side eyes for attaching it to the side paws with bolts of retaining half rings, superimposed on the outer cylindrical surface of the product and pulled together by bolts. The carriage is equipped with linear scales. In addition, a retainer in the form of a spring-loaded rod is made in the grooved head of the lead screw, and a blind hemispherical recess in the front wall of the carriage.

Applicants are not aware of the use of the distinctive features of a manual scanning device to achieve the indicated results.

The essence of the utility model and its work are illustrated by graphic materials, which show:

figure 1 - General view of the device;

figure 2 is a longitudinal section of a device;

figure 3 is a cross section of the device;

figure 4 is a longitudinal section of a carriage;

figure 5 - mounting node - banding half rings.

The device comprises a longitudinal guide 1 (Fig. 1), a mounting unit 2 (Fig. 5), a carriage 3 with rollers 4. The longitudinal guide 1 (Fig. 1, Fig. 2) is an arcuate plate with a longitudinal window 5, the side walls of which are made stepwise, on one of the walls a degree scale 6 is made, and on the other eyelets 7 with longitudinal holes 8. On the end walls 9 of the window 5 there are risks 10. The fixing unit 2 (Fig. 5) consists of two retaining half rings 11 superimposed on the outer the surface of the controlled product and contracted between bolt engagement 12. The half rings 11 are provided on one side with side tabs 13 with screws 14. The carriage 3 includes a frame 15 (FIG. 2, FIG. 3) with side walls 16 on which linear scales 17 are applied; end walls 18, the first additional guide 19 and the second additional guide 20 (FIG. 1, FIG. 2) mounted perpendicular to the longitudinal guide 1, the lead screw 21 with a knurled head 22 (FIG. 1, FIG. 3), mounted in the walls 18 with the possibility of rotation around its own axis; the slider 23, moved by a screw 21 along the guides 19 and 20, and interacting through the clamping unit 24 with the prismatic transducer 25. The clamping unit 24 of the transducer 25 consists of two rods 26 with spherical tips 27 and springs 28 (figure 2, figure 4), mounted in the vertical blind holes of the slider 23. In the corrugated head 22 of the lead screw 21 there is a latch (Fig. 4) consisting of a spring-loaded rod 29 with a spherical end face 30 and a spring 31, as well as a spherical recess 32 in the end wall 18 of the carriage 3 from the corrugated side heads 22. 33 o the item being monitored is designated, and reference numeral 34 is the longitudinal axis of the welded joint of the product 33.

The device operates as follows.

Before starting control on the controlled product 33 at a distance taken into account the longitudinal size of the holes 8 in the eyes 7, the width of the side wall of the window 5 and the distance of the pictures 10 on the end walls 9 of the window 5 of the longitudinal guide 1, set the retaining rings in such a way that their side tabs 13 were facing the welded joint and tighten them with bolts 12. Select the reference point and, accordingly, set the longitudinal guide 1, dressing its eyes 7 with holes 8 on the screws 14 of the side legs 13 of the retaining half rings 11. Combine the risks 10 on the end walls 9 of the guide 1 with the longitudinal axis 34 of the welded joint of the product 33 and nuts or flaps (not shown in FIG. 1 ... 5) fix the eyes 7 to the screws 14 of the side tabs 13 of the half rings 11.

On the carriage 3, with the help of the screw 21, rotating the knurled head 22, the slider 23 is shifted so that the risk applied vertically on its side surface coincides with the axis 34 of the welded joint of the product 33 and with one of the pictures of the linear scale 17 on the side wall 16 of the frame 15 of the carriage 3, corresponding to the thickness of the welded joint of the product 33 (the thickness of the welded edges of the product 33). The carriage 3 is installed by rollers 4 on the lower step of the side walls of the longitudinal window 5 so that the upper steps of the side walls limit the lateral displacement of the carriage 3 when it is longitudinally moved along the guide 1. Move the carriage 3 along the longitudinal guide 1 to the extreme position, for example, to the left, then begin ultrasonic testing of the welded joint, while displacing the carriage 3 to the right along the guide 1 to the stop. Having reached the stop to the right, rotate the knurled head 22 of the lead screw 21 by 1 revolution, when a slight click of the lock is felt, the carriage 3 begins to shift to the left, while the ultrasonic transducer 25 is shifted 1 mm closer to the axis 34 of the welded joint of the product 33. In the leftmost the position of the carriage 3 on the guide 1 by rotating the knurled head 22 of the lead screw 21, the prismatic ultrasonic transducer is again displaced 1 mm closer to the longitudinal axis 34 of the welded joint. And so each time in the extreme position of the carriage 3 on the right or left of its longitudinal movement along the longitudinal guide 1, the ultrasonic transducer 25 is shifted by 1 mm towards the longitudinal axis 34 of the welded joint until it reaches it.

When a defect is detected in the welded joint, the angular coordinate φ is determined on a scale of 6 longitudinal guides, the linear coordinate Y is determined on a scale 17 on the carriage 3, the depth of the defect according to the formula:

h _d = L _d · sin (90 ° -α),

where: h _d - the depth of the detected defect;

L _d - the distance from the detected defect to the point of input-reception of ultrasonic vibrations;

α is the angle of entry of ultrasonic vibrations into the controlled object.

Thus, the proposed device solves the problems posed by the utility model: it provides a uniform step for transverse transducer movement, parallelism of the paths described along the welded ring connection, eliminates uncontrolled zones at the beginning and at the end of each longitudinal scan of the transducer, the longitudinal guide is securely attached to a non-magnetic product, in addition , it is possible to determine the angular and linear coordinates of the detected defects of the welded joint and their depths Nia throughout the thickness of the compound may optionally be composed defectogram protocol and the results of ultrasonic testing on a personal computer at manual input detected defect parameters: coordinates and depth.

Information sources.

1 RF Patent No. 1182383, cl. G01N “Device for manual ultrasonic inspection of welds by longitudinal-transverse scanning”, published on 09/30/1985.

2 RF Patent No. 1174851, cl. G01N “Device for ultrasonic inspection of welds”, published on 08.23.1985.

Claims (1)

A device for ultrasonic inspection of ring welds by manual longitudinal-transverse scanning, comprising a longitudinal guide, a carriage mounted on the guide, an additional guide mounted on the carriage perpendicular to the main guide, a slider interacting with the additional guide, a transducer with a clamping device fixed on the slider, characterized the fact that it is equipped with a second additional guide mounted in the carriage parallel to the first additional direction with a lead screw with a grooved head mounted in the carriage parallel to the additional guides, with the possibility of rotation around its own axis, and interacting with the slide, while in the grooved head of the lead screw there is a latch in the form of a rod, spring-loaded against the wall of the carriage, in which a spherical a recess, and linear scales are applied on the side walls of the carriage, the main guide is an arcuate plate with a longitudinal window through which the prismatic contact transducer mates with the surface of the input-reception of ultrasonic vibrations into the welded joint of the product, a degree scale is applied on one of the side walls of the main guide, and the other is equipped with side eyes for attaching it to this guide to the side legs of the retaining half rings superimposed on the outer cylindrical surface of the product and pulled together with another bolted.