Scanning device for ultrasonic inspection of articles.

Field of engineering

0001The invention relates to devices for the nondestructive testing of products, in particular on scanning devices for ultrasonic control of products.

State of the art

0002A known device for ultrasound control contains ultrasonic transducers, which are fastened by means of a suspension device on a carriage whose support rollers touch the surface of the product to be tested (SU, A, 555333).

0003In this device, a stable position of the ultrasonic transducers with respect to the surface of the product to be tested is not achieved because kinematic connecting elements are missing, which allow a secure orientation of the ultrasonic transducers during their movement on the surface of the product. The fixed connection of the suspension of the ultrasonic transducer with the car gives these transducers no way to overcome obstacles, such as weld seams, metal splash after welding, as a tilting moment may arise, which leads to damage of the suspension.

0004Moreover, this device is characterized by low reliability and safety of the control of products with flat and curvilinear surface in different spatial position of the device.

0005Also known is a scanning device for ultrasonic control of products, in which the ultrasonic transducers are applied to the product to be controlled and pressed to its surface by means of a pressing device, the ultrasonic transducers are mounted on an engine by means of a suspension device (SU, A, 1128161) ,

0006In this scanner, the apparatus for suspending the ultrasonic transducers on the engine includes carriages which are hinged to the pantograph rigidly connected to the engine.

0007The articulated parallelogram of each Fantografen is cushioned by a spring and serves as a suspension device for the ultrasonic transducer.

0008Such an embodiment of the suspension is structurally complicated and has large _AB measurements and a great deal of weight. This does not make it possible to control products with a flat and crooked surface in different spatial position of the scanner and leads to low reliability and credibility of the control of products made of both ferromagnetic and non-ferromagnetic materials.

0009In addition, in such a design of the hitch overcoming obstacles in the form of metal splats after welding or weld seams is impossible because when driving the car with the ultrasonic transducers on obstacles a tilting moment arises because the axes of the car connecting the pantographs joints high above the Surface of the product to be inspected.

Disclosure of the invention

0010The invention has for its object to develop a scanning device for ultrasound inspection of products, in which the structurally simplified design of suspending the ultrasonic transducer on the engine of the scanner suspension determined the reliable and truthful ultrasound control of an extended class of both ferromagnetic and non-ferromagnetic Materials prepared to be controlled products with a flat and crooked surface in different spatial position of the scanner allows and has the smaller dimensions and a lower weight.

0011This is achieved in that in the scanning device for ultrasonic control of products with ultrasonic transducers, which are attached to the engine of the scanner by means of a suspension device, applied to the product to be controlled and pressed to its surface by means of a pressing device according to the invention, the suspension device for the suspension of Ultrasonic transducer on the engine of the scanning device includes flexible elements which are arranged above the surface of the product to be controlled along the direction of movement of the device defined by the engine and wear ultrasonic transducer mounted thereon, and a beam which lies over the flexible elements along the direction of movement of the device and mechanically linked to the flexible elements,and at least two self-adjusting supports, one part of which is on the beam and the other part of which is arranged with respect to the first part so that the common displacement of the two parts with respect to that common to the self-adjusting supports and immediately in the vicinity of to vibration of the product to be controlled, as well as provided with hinges, which are mechanically connected to the beam and the engine.and is provided with hinges, which are mechanically connected to the beam and the engine.and is provided with hinges, which are mechanically connected to the beam and the engine.

0012It is advantageous to carry out a part of each self-adjusting support in the form of an attached at one end of the beam ring-shaped element whose longitudinal axis serves as a common axis of oscillation for both self-adjusting supports and which is attached to one end of the beam, and the other part to build at least three rollers, which are mounted on a common support plate and are in contact with the working surfaces of the annular element, wherein they kinematically connect one of the wings to the beam via the annular element and the support plate.

0013, Conveniently, a portion of each self-adjusting support may be in the form of a guide rail fixed to the beam having two cylindrical work surfaces and a flat work surface connecting them, and the other part may be a flexible insert mechanically connected to two cylindrical work surfaces and one this connecting planar work surface are made, the second-mentioned cylindrical work surfaces with the first-mentioned cylindrical work surfaces should be correspondingly congruent and they touch while the longitudinal axes of all cylindrical work surfaces coincide and serve as a common axis of vibration for the two / self-adjusting supports.

0014In order to control ferromagnetic article products, it is desirable to provide the pressing device for urging the ultrasonic transducers against the surface of the product to be inspected with main permanent magnets installed directly above the corresponding ultrasonic transducers mounted on the flexible elements.

0015In the case of control of articles made of non-ferromagnetic materials, the device for pressing the ultrasonic transducers against the surface of the product to be inspected may include a platform placed in the area opposite the surface of the product to be inspected, and for automatic repetition of the product Trajectory of the scanning device is prepared, and have additional permanent magnets which are arranged on the platform with the poles of the main permanent magnets unlike poles symmetrical to the Hauptpermanentmagneten.

0016Such a design of the patent-pending scanning device for ultrasonic control of products ensures reliable and credible control of the products and results in smaller dimensions, a lower weight of the device as a whole and a significant simplification of their construction.

0017The device according to the invention also makes it possible: to extend the class of products to be controlled both from ferromagnetic and from non-ferromagnetic materials with a flat and crooked surface and to carry out the control at different spatial position of the device.

0018The fixed connection of the ultrasonic transducers with the flexible elements allows to overcome obstacles on the surface of the product to be inspected such as metal splats after welding or weld seams irrespective of the curvature of the product surface.

0019The smaller dimensions and lower weight of the scanning device according to the invention allow their operation by a person.

0020The permanent magnets of the pressing device of this device allow the use of a ferromagnetic fluid to achieve a stable acoustic contact of the ultrasonic transducer with the surface of the products to be controlled.

description

0021The invention will be described in the following description of concrete variants of their execution and with reference to

0022Drawings explained in more detail. Show here<ul id="ul0001" list-style="none"><li>Figure 1 is a arranged on the product to be controlled scanning for ultrasonic control of products according to the invention (side view with partial section, product in cross section).</li><li>FIG. 2 the same as in FIG. 1 (top view with detail); FIG.</li><li>Fig. 3 is a kinematic diagram of the device of Fig. 1;</li><li>4 shows a section in the direction of the line IV-IV in Figure 2 (on an enlarged scale).</li><li>5 shows a section in the direction of the line VV in Fig. 2.</li><li>Fig. 6 is a section taken in the direction of line VI-VI in Fig. 5 (on an enlarged scale);</li><li>7 shows another embodiment of the scanning device according to the invention (side view with detail, product in cross-section);</li><li>8 shows a section in the direction of the line VIII - VIII in Figure 7 on an enlarged scale.</li><li>Fig. 9 the same as in Fig. 7, view in the direction of arrow A;</li><li>10 shows a further embodiment variant of the scanning device according to the invention (side view partially cut, product in cross-section);</li><li>FIG. 11 the same as in FIG. 10 (top view with detail); FIG.</li><li>Fig. 12 is a kinematic diagram of the device of Fig. 10;</li><li>Fig. 13 section in the direction of the line XIII-XIII in Fig. 10;</li><li>14 is a cross-sectional view in the direction of the line XIV-XIV in FIG. 11 on an enlarged scale:</li><li>Fig. 15 is a side view of the invention according to FIG. 1 executed scanning on a pedestal with test pattern in cross section (the device is shown on a reduced scale).</li></ul>

Preferred embodiments of the invention

0023An inventively designed scanning device for ultrasonic control of products contains ultrasonic transducers 1 (FIG. 1), which are arranged on the product to be controlled 2. In this embodiment of the device according to the invention, the ultrasonic transducers 1 are housed in housings 3 (FIGS. 1 to 3).

0024The ultrasonic transducers 1 (FIG. 4) are pressed against the surface 4 of the product 2 to be controlled by means of a pressing device 5 and are fastened to an engine 6 (FIGS. 1 to 3) by means of a suspension device 7.

0025The suspension device 7 contains flexible elements 8, a beam 9, two self-adjusting supports 10 and two wings 11.

0026The flexible elements 8, optionally two metal bands, are arranged above the surface 4 of the product 2 to be inspected along the direction of movement of the device predetermined by the engine 6. In this case, the movement takes place in the direction of the arrows B (Figure 2) and C along the weld 12 on the product 2. The flexible elements 8 lie on either side of the weld 12. On the flexible elements 8 (Figures 1 and 4) are the Ultrasonic transducer 1 rigidly attached.

0027Over the flexible elements 8 (FIG. 2), along the direction of movement of the device according to the invention, the beam 9 is mechanically connected to the flexible elements 8.

0028The self-adjusting supports 10 (Fig. 5) consist of two parts, one part 13 is arranged on the beam 9 and the other part 14 with respect to the former part 13 so that the common displacement of the two parts 13 and 14 with respect to the self-adjusting supports 10 common and located directly in the vicinity of the surface 4 of the product to be controlled 2 vibration axis 15 takes place. In the present embodiment, the oscillation axis 15 lies directly on the surface 4 of the product 2 and only two self-adjusting supports are plastered

0029Depending on the number of ultrasonic transducers but three or more self-adjusting supports can be used.

0030The wings 11 (Figures 1 and 2) are kinematically connected to the beam 9 and the engine 6.

0031In the embodiment of the scanning device to be treated according to the invention, one part 13 (Figure 5) of each self-adjusting support 10 is shaped as a ring-shaped element 16 whose longitudinal axis forms the common axis of oscillation 15 of the two supports arranged at the ends of the beam 9, as shown in FIG 2 can be seen.

0032The other part 14 (Figure 6) of each support 10 is designed in the manner of four on a common support plate 18 for them by means of screws 19 mounted rollers 17 which are connected to the working surfaces 20 (Figs. 3, 5) and 21 of the annular Elements 16, are in contact and kinematically connect the beam 9 via the annular member 16, the support plate 18 and a hinge 22 with the pivot 11.

0033You can also use three or more than four rolls. This depends on the load to which the rollers are exposed during the movement of the device on the product to be inspected.

0034The mechanical connection of the beam 9 (Fig. 1 to 3) with the flexible elements d is realized by means of a rod 23 which on the beam 9 by means of _screwp_aaren ₂₄ (_Fig_{, 1} and ₂) is attached. With the ends of the rod 23 25 holders 26 are connected by means of a joint, in which by means of a locking screw 27 and a clamping element 28 for tightening the flexible elements 8 (Fig. 4), the ends of these elements 8 are attached.

0035Each housing 3 of the ultrasonic transducers 1 has a sealing lid 29 and a ferromagnetic fluid cavity 30, the use of which is useful in forming a stable acoustic contact between the ultrasonic transducers 1 and the surface 4 of the product 2 to be inspected.

0036According to the invention, the engine 6 (FIG. 2) of the scanning device contains four housings 31, which are articulated to the ends of the wings 11 by means of axles 32. In each case 31 (Fig. 1) is a magnetic wheel 33 which is fixed to the output shaft of a fixedly connected to the housing 31 reduction gear 34. An electric motor 35 (Figure 2) is mounted on each reduction gear 34 with the output shaft of the electric motor 35 engaged with the first stage of the reduction gear 34.

0037The engine 6 of the device may also include two electric motors and reduction gears, which are kinematically connected to the first in the direction of movement of the device. This depends on the spatial position of the device as it moves on the surface of the product to be inspected, eg in the control of vertical welds.

0038The device embodied according to the invention comprises a signal generator 36 arranged on the beam 9 (FIGS. 1 and 2) for generating signals at the beginning and at the end of the control, as well as weld tracking sensors 37 which are arranged on the support plates 10 and generate signals which the deviation of the device from the weld 12 during its movement are proportional, and also to the joints 22 mounted rotary encoder 38 (Figure 5) for determining the angle of rotation of the pivot 11 with respect to the support plates 18 and a not shown in the drawing and Subject invention not belonging distance sensor for detecting the distance traveled by the device according to the invention.

0039Mounted on the beam 9 (Figure 2) is a defect marker 39 which bears on the surface of the product marks z.3. with color to indicate existing defects in the product to be inspected 2 according to the results of the ultrasound inspection during the movement of the device.

0040Eyelets 40 are provided with openings 41 on the housings 31 (FIG. 5) which are intended for the adjustment of the suspension device 7 before the start of the inspection.

0041If products 2 (FIG. 4) made of ferromagnetic materials, eg of steel, are inspected with the scanning device designed according to the invention, the pressing device 5 for pressing the ultrasonic transducer 1 against the surface 4 of the product 2 to be controlled contains permanent magnets 42 (poles S, N ) disposed above the respective ultrasonic transducers 1 and fixed on the flexible elements a.

0042For the inspection of products 43 (Figure 7) from non-ferromagnetic materials, eg aluminum, the scanning device according to the invention is carried out according to Figures 1 to 6.

0043Unlike this device contains the pressing device 5 (Figures 7 and 8) includes a platform 44 disposed on the surface 45 of the product 43 on the side opposite the surface 46 of the product 43 under control. The curvature of the surface 47 of the platform 44 corresponds to the curvature of the surface 45, the platform 44 being suitable for automatically repeating the trajectory of the scanning device according to the invention. The pressing device 5 also includes permanent magnets 48 (poles S, N) which are arranged on the platform 44 with the poles N of the permanent magnets 42 unlike the poles and symmetrical to the latter.

0044The automatic repetition of the trajectory of the scanning device by the platform 44 is achieved by means of the magnetic coupling of the wheels 33 (FIG. 7) of the engine 6 and the permanent magnets 42 with the permanent magnets 49 and 48 arranged on the platform 44, wherein a secure adhesion the wheels 33 are secured to the surface 46 of the product 43 to be inspected and the ultrasonic transducers 1 are pressed against this surface, as well as by means of self-adjusting wheels 50 (Figure 9). The wheels 50 are mounted on the platform 44 by means of sprung joints 51 and contact the surface 45 of the article 43. By means of the joints 51, the clearance between the surface 45 of the product to be controlled_eand the surface of the magnets 48 and 49 are controlled, which is required for overcoming possible obstacles such as weld roots by the platform 44 with the magnets 48, 49 mounted thereon and the self-adjusting wheels 50.

0045In Fig. 10 to 14, an embodiment of the scanning device according to the invention is shown, which is similar to the device of FIGS. 1 to 6 constructed.

0046The difference lies in the different design of self-adjusting supports 10 (Figures 10-13). Thus, one part 13 (FIGS. 10 and 1) of each support 10 is designed as a guide rail 52 with two cylindrical working surfaces 53 and 54 and a planar working surface 55 connecting them. The guide rail 52 (FIG. 10) is fixedly connected to the beam 9 by means of a pair of screws 24.

0047The other part 14 of each support 10 constitutes an insert 56 (Figures 10, 12 and 13) mechanically connected to the flexible elements 8 with two cylindrical working surfaces 57 (Figures 10) and 58 joined together by a flat working surface 59 , the cylindrical work surfaces 53 and 54 are congruent and touch the latter. The longitudinal axes of all cylindrical working surfaces 53 (FIGS. 12), 54, 57 and 58 coincide and serve as a common axis of oscillation 15 for the two self-adjusting supports 10.

0048In the device according to FIGS. 10 to 14, more than two self-adjusting supports 10 can be installed. This depends on the number of ultrasonic transducers.

0049The mechanical connection of the insert 56 (Fig. 10 and 13) with the flexible elements ö is realized by its fixed connection to the rod 23 by means of screws 60.

0050The kinematic connection of the beam 9 (FIG. 12) with the wings 11 takes place by means of the joints 22 and. 61st

0051In this variant of the device, the beam 9 is provided with hinges 62 (Figures 10 and 11), which allows for an extension of the class of controllable surfaces 4 and a simplification of the fine adjustment of the device before the start of the control.

0052The sensors 37 intended to track the weld 12 are mounted on springs 63 provided with hinges 64, the springs 63 being fixed to the rod 23 by means of the hinge 25. At this weld trackers limit switch 65 are mounted, which are intended to shut off the transmitter 37 for the time required for the crossing of occurring and the display of these sensors 37 influencing obstacles, z.3. transverse welds through which donors 37 are required. One of the limit switches 65 additionally has the task of stopping the movement of the entire device,

0053This variant of the scanning device according to the invention is preferably to be used in cases where the control is to take place on vertical and inclined surfaces 4 of the products 2, regardless of the direction of movement of the device.

0054Mounted on the housings 3 are ferromagnetic shields 66 (FIG. 14) which attenuate the mutual interference of the magnetic stray fields generated by each permanent magnet 42.

0055During storage and in the preparation of the device according to the invention, a base 67 (FIG. 15) having a surface 68 common to the test pattern 69 is used, as well as a housing 70.

0056The scanning device for ultrasonic control of products according to the invention works in principle as follows.

0057Prior to the control of products 2 made of ferromagnetic materials (FIG. 1), the device according to the invention shown in FIGS. 1-6 is placed on the surface 68 (FIG. 15) of the base 67 with a test pattern 69. The curvature of the surface 68, the thickness and the material of the test pattern 69 must be identical to those of the product 2 to be inspected. The bar 9 is directed along the direction of movement of the device according to the arrows B (Fig. 2) and C. By means of the axles 32 (FIG. 5), the ends of the pushers 11 are fixed in the holes 41 provided with the openings 41 of the housings 31 of the engine 6 at a height predetermined for the product 2 in question. By means of the pairs of screws 24 (Figure 1), the rod 23 is fixed to the beam 9 at a distance from the surface 6d, in which the rod 23 with the holders 26 fastened thereto by means of the hinges 25 can move unhindered over the bead surface of the weld 12 and over the surface 4 of the product 2. By means of the clamping elements 28 (FIG. 4) for tensioning the flexible elements 8, the position of the ultrasound transducers 1 with respect to the test pattern 69 is controlled so that the ultrasound transducers 1 cover the entire cross-section of the product 2 to be controlled (if necessary, the actual volume of the weld 12) and the immediately adjacent zones), whereupon the ends of the flexible elements 8 are fastened together with the clamping elements 28 with the locking screws 27.

0058The cavity 30 (FIG. 4) of the housing 3 is filled with a ferromagnetic fluid to provide a stable _bTo ensure acoustic contact between the ultrasonic transducers 1 and the surface 6 d (FIG. 15) of the test pattern 69. Then the functionality of all ultrasonic transducers 1 is tested.

0059The subset 67 with the control set device of Figs. 1-6 is brought close to the product 2 to be controlled along the direction of movement (the weld 12), and the patent pending device travels to the surface 4 of the product 2 to be inspected ,

0060The movement of the device on the surface 4 of the product 2 is due to the rotation of the magnetic wheels 33 (Fig. 1, 5), which adhere to the surface 4 safely.

0061If welds 12 are controlled with the device of FIGS. 1-6, the rotational speed of the wheels 33 is controlled by using the indication of the weld tracking sensors 37 and the rotary encoders 38.

0062When driving one of the forward of the direction of movement of the wheel 33 on an obstacle, for example, on a transverse weld, the forward direction of the direction of the pivot 11 with respect to the surface 4, the common support plate 18 with the rollers 17 also tilts the pivot 11 and the common support plate 18 are connected to each other by means of the joint 22, but the annular element 16 of the forward self-adjusting support 10 shifts between the rollers 17, and the ultrasonic transducers 1 do not become with respect to the weld 12 shifted, which is required for the ultrasonic control of the weld 12. Upon further movement of the device this obstacle (the transverse weld) is overcome by the ultrasonic transducers 1,

0063Then, this obstacle is overcome by the rear wheel 33 after the direction of movement, which is on the same side as the front wheel 33. The rear pivot 11 together with the common support plate 18 mounted thereon with the rollers 17 tilts, and the annular element 16, which contacts with its work surfaces 20 and 21 these rollers 17, shifts with respect to these rollers, and the position of the ultrasonic transducers. 1 with respect to the weld 12 is not changed what

0064for the safe movement of the ultrasonic transducer 1 in the control of the weld 12- is required.

0065The same goes for overcoming the obstacles by the other magnetic wheels 33 of the engine 6 and the ultrasonic transducer 1 of the device according to FIGS. 1 to 6 in front of him.

0066If the ultrasonic transducers 1 detect a defect, the defect on the surface of the weld, for example, marked with color, the defect is registered at the same time.

0067After completion of the check, the device is stopped on a command from the encoder 36. Under the rear wheels 33 of the device pushes the pedestal 67, the device drives on it and stops. The device is switched off, covered with the housing 70 and brought to the next weld to be inspected.

0068If products 2 with horizontally oriented surfaces 4 or vertical welds 12 and annular welds 12 horizontal pipelines are to be controlled, it is expedient in the

0069Device according to FIGS. 1-6 to remove two reduction gear 34 with the electric motors 35 from the rear in the direction of the pivot 11 and to fix the associated with the latter support plate 18 so that the rear pivot 11 are not pivoted with respect to the support plate 1ö can.

0070Before starting to inspect products 43 (Figures 7 and 8) made of non-ferromagnetic materials, eg aluminum, the device constructed according to the invention is placed on pedestal 67 (Figure 15) with a test pattern 69, the curvature of surface 68 and the material of the test pattern 69 should be identical to the product 43 to be controlled. Then all preparatory operations are carried out as in the setting of the device of FIG. 1-6 to carry out the control.

0071From the rear of the pedestal 67, the height of the platform 44 is controlled by means of the joints 51 (FIG. 7) so that it can overcome any obstacles, such as weld seams.

0072The control device of Figs. 7-9 is placed on the product 43 (Fig. 8) so that the axes of the respective magnets 42 and 48 coincide, whereupon the device is turned on.

0073Next, the device works as described above.

0074Before starting to inspect products 2 made of ferromagnetic materials, the device according to FIGS. 10 to 14 is placed on the surface 68 (FIG. 14) of the pedestal 67 with a test pattern 69. The curvature of the surface 68, the thickness and the material of the test pattern 69 must be identical to those of the product 2 to be inspected. In this case, the beam 9 is arranged along the movement direction of the device indicated by the arrows B (FIG. 11) and C.

0075By means of the axles 32 (FIGS. 10 and 13), the ends of the wings 11 are fixed in the holes 41 provided with eyelets 40 of housings 31 of the engine 6 at a predetermined height, and by means of the screws 60 and the pairs of screws 24 Adjusted height of / self-adjusting supports 10, wherein the common axis 15 on the surface of the sixth₀ (Fig. 15). In this case, the rod 23 (Figures 10 and 13), the holders 26 of the flexible elements d, the weld tracking sensors 37, the springs 63 and the joints 64 are arranged at a height in which the overcome by the technical conditions approved obstacles on the product 2, for example, the voltage applied to the weld 12 to be inspected Schweißnahtraupen is possible.

0076The holder 26 and the springs 63 are secured by means of the joint 25, and by means of the clamping elements 28 for clamping the flexible elements 8, the position of the ultrasonic transducer 1 with respect to the test pattern 69 is controlled so that the ultrasonic transducer 1, the whole volume to be controlled Product 2 (possibly the entire volume of the weld 12 and the adjacent thereto zones) durchschallen, whereupon the ends of the tensioned flexible elements 8 are fastened together with the clamping elements 28 by means of the locking screws 27.

0077Then, the operability of all donors 36, 37 and 3ö and the defect marker 39 is checked and the work of the limit switch 65 regulated.

0078The cavity 30 (FIG. 14) of the housings 3 is filled with ferromagnetic fluid in order to ensure a stable acoustic contact between the ultrasonic transducers 1 and the surface 68 of the test pattern 69, after which the functionality of all ultrasonic transducers 1 is checked. The pedestal 67 with the control device shown in FIGS. 10-14 is brought close to the product 2 to be inspected, and the device according to the invention moves on the surface 4 of the product 2 to be inspected.

0079The movement of the device on the surface 4 of the product to be controlled 2 takes place as a result of the rotation of the magnetic wheels 33 which adhere securely to the surface 4. The rotational movement of the output shafts of the electric motors 35 is transmitted via the reduction gears 34 to the magnetic wheels 33, which are fixed to the output shafts of the reduction gear 34. When changing the rotational speed of the electric motors 35, the position of the pivot 11 (Fig. 12) with respect to the beam 9 also changes due to the existing joints 22 and 61. Considering the signals of the weld seam tracking sensors 37, the rotary encoder 38, the signal generator 36 for the beginning and end of the control and the distance sensor to change the rotational speed of the wheels 33,

0080If the device encounters an obstacle (eg, a weld) whose height is inadmissible according to the technical requirements for the product 2 in question, the limit switch 65, which is arranged on the forward-facing weld sensor 37 in the direction of movement, generates a signal for switching off the device.

0081When the ultrasonic transducers 1 are displaced to either side of the weld 12, the signal from the encoder 37 causes the braking of the output shaft of the electric motor 35. The pivots 11 are pivoted about the joints 22 and the device moves to the weld seam 12.

0082In the control of horizontally lying welds on vertical or inclined surfaces, the rear wheels 33 move downwards under the influence of the weight of the entire device from the weld seam 12 to be inspected. The seam tracking sensor 37 is also displaced and provides a command to one of the electric motors 35 , which reduces its number of revolutions and reduces the rotational speed of the wheel 33. As a result, the pusher 11 of the rear wheels 33 about the direction of movement is rotated about the hinge 22 and returned to the weld axis. Thus, the device occupies the position required for control and movement on the product 2.

0083If an impermissible defect is detected, the defect marker 39 on the surface 4 of the product 2 to be inspected makes a mark, for example with color. After completion of the control, the device is stopped after a signal from the encoder 36. Under the device pushes the pedestal 67 and the device drives on it.

0084During movement, if the front wheel 33, which is in the direction of movement, encounters an obstacle which is permissible for the product in question and drives on the outer edge of the wheel 33, this edge rises on the axle 32 without affecting the beam 9 and the rear wheels 33.

0085If obstacles occur that lift the entire wheel 33, the pivot 11 of the front wheel 33 rotates and lifts the beam 9, its support 10 and the support 10 of the rear wheels 33, which do not separate from the surface 4 of the product 2 to be controlled, since the pawl 11 of the rear wheels 33 is rotated in the joint 61. At this time, the position of the ultrasonic transducers 1 pressed by the magnets 42 against the surface 4 of the product 2 is not changed because the beam 9 is pivoted with the guide rail 52 with respect to the insert 56, and the flexible member 8 on the side of the rear wheels 33 is tensioned wherein it compensates the stroke of the rod 23 with the holders 26.

0086When approaching the device on a weld which cuts the weld to be controlled 12, the limit switch 65 of the front-direction in the direction of movement 37 is rotated and provides a signal to shutdown the encoder 37 for the time of its occupancy over the weld, creating a false indication of Change in the direction of movement of the device is prevented. The signal of the limit switch 65 causes the shutdown of lying on the same side of the seam to be controlled 12 ultrasonic transducer 1 when crossing the crossed weld.

0087Next, the device of FIG. 10 to 14 similar to the device of FIG. 1 to 6.

0088The patent-pending scanning device for the ultrasonic inspection of products ensures greater reliability and credibility of the control and has smaller dimensions, a lower weight and a simpler construction of the suspension device. It allows the control of an extended class of products of both ferromagnetic and nonferromagnetic materials with different curvature of the surface and different spatial position of the device.

0089The fixed connection of the ultrasonic transducer 1 with the lying in the immediate vicinity of the product surface flexible elements 8 and the suspension device gives the additional possibility, obstacles on the surface of the product to be controlled, for example in the form of Schweißnahtraupen or metal splats after welding regardless of the curvature of the product surface to overcome. The permanent magnets of the pressing device of the device according to the invention allow the use of a ferromagnetic fluid to achieve a stable acoustic contact between the ultrasonic transducers and the surface of the product to be controlled at different spatial position and at an ambient temperature of -50 ° C to + 50 ° C. ,

0090For example, for on-the-ground inspection of annular welds of 1420 mm diameter pipes with a pipe wall thickness of up to 40 mm, a scanning device according to the invention with a weight of up to 8 kg is used, which is operated by one person and used to control one Butt joint required time is less than 4 min.

Commercial Anwendbark ince

0091The invention can in various industries such as mechanical engineering, shipbuilding and nuclear power engineering, the construction of boilers, natural gas and petroleum pipes for ultrasonic control of welds and the base material ferromagnetic and nonferromagnetic products both flat and with a crooked surface at different spatial position of Scanning are used, the overcoming of obstacles by the device in the form of metal splats after welding or weld seams at displaced welding edges and the automatic tracking of the weld axis or the automatic movement to a predetermined trajectory are guaranteed.