RU2194979C1 - Device for ultrasonic monitoring of cylindrical articles - Google Patents

Abstract

FIELD: nondestructive testing of cylindrical articles; designing equipment for monitoring backing-up rolls of rolling mills. SUBSTANCE: proposed device has body made in form of bracket, acoustic unit with holder for ultrasonic transducers and contact liquid supply unit. Bracket is made in form of fork with plate mounted between its ends; mounted orthogonally on this plate is cylindrical rod of contact liquid supply unit which consists of upper swivel part located above plate and lower hollow part made in form of distributing manifold located under plate. Passages of manifold are connected with holders of transducers by means of flexible hoses. Device is provided with pressure regulator. Acoustic unit is made in form of U-shaped fork rigidly connected with lower portion of cylindrical rod with larger rocker arms secured on its ends; smaller rocker arms are articulated on ends of each larger rocker arm and are rigidly connected in pairs. Ultrasonic transducer holders are mounted between each pair of smaller rocker arms by means of axially movable swivel axles provided with locking mechanism. Each ultrasonic transducer is made in form of orthogonal frames located one in other. Inner frame is connected with outer one for motion without limitation of degree of freedom. EFFECT: enhanced accuracy of measurements; autonomous calibration of transducers against primary standards. 3 cl, 5 dwg

Description

 The invention relates to the field of non-destructive testing methods for cylindrical products, and in particular to the design of equipment for monitoring the supporting rolls of rolling mills.

 A device for ultrasonic monitoring of the surface of a material is known, comprising ultrasonic transducers, a transducer movement mechanism and a measuring unit (see USSR author's certificate 1298657 in class G 01 N 29/22 for 1987).

 The disadvantage of this device is the impossibility of its use in the control of cylindrical products.

 A device for ultrasonic inspection of pipes is known, containing a base, a block of ultrasonic transducers fixed on it, and also a mechanism for moving the controlled product (see USSR author's certificate 1714488 in class G 01 N 29/04 for 1992).

 The disadvantage of this device is the uneven pressure transmitted by the ultrasonic transducers.

 The closest adopted for the prototype is a device for ultrasonic testing of cylindrical products, containing a housing in the form of a bracket, an acoustic unit with holders of ultrasonic transducers and a contact fluid supply unit (see USSR author's certificate 1226292 in class G 01 N 29/26 for 1986 .).

 The disadvantage of this device is the uneven pressure on all the transducers of the acoustic unit, which significantly affects the accuracy of the measurements, as well as the impossibility of autonomous standardization of any of the transducers.

 A device is proposed for ultrasonic testing of cylindrical products, comprising a housing in the form of a bracket, an acoustic unit with holders of ultrasonic transducers and a contact fluid supply unit, characterized in that the bracket is made in the form of a plug provided with a bar on which the cylindrical rod of the contact fluid supply unit is orthogonally mounted, consisting of a rotatable upper part located above the plank and a lower hollow part made in the form of a distribution manifold located under Lanka, manifold channels are connected to converters holders flexible hoses; the device is equipped with a pressure regulator; the acoustic unit is made in the form of a U-shaped fork, at the ends of which large rocker arms are articulated, at the ends of which small rocker arms are articulated; between each pair of small rockers by means of rotary axes equipped with a locking mechanism with the possibility of their axial movement, holders of ultrasonic transducers are installed, each of which is made in the form of orthogonal frames arranged in one another, while the inner frame is connected to the external one with the possibility of its movement without limiting degrees of freedom .

 The locking mechanism of the rotary axis is made in the form of bushings installed in the outer and inner frames of the holder and covering the rotary axis on which grooves are made interacting with the annular spring.

 The pressure regulator is a sector with holes located on the periphery of its curved section, interacting with the locking element. The sector is rigidly mounted on the upper rotary part of the cylindrical rod.

 The proposed device allows for the control of cylindrical products to provide uniform pressure on all transducers of the acoustic unit, provides the ability to remove frames with transducers and carry out the standardization of each transducer independently, and also allows you to rotate the contact fluid supply unit with a fixed fitting for contact fluid into the collector.

 In FIG. 1 shows a front view of a device; figure 2 is a top view; in FIG. 3 is a side view; figure 4 is a locking mechanism, and figure 5 is a pressure regulator.

 The device comprises a housing, which is a bracket 1, made in the form of a fork (see figure 2), between the ends 2 of which a strap 3 is mounted on rotary axes (not shown in the figures). On the bar 3, a cylindrical rod of the contact fluid supply unit is installed, consisting of a rotatable upper part 4 located above the bar 3, and a lower hollow part 5, which is a distribution manifold. The lower hollow part 5 of the cylindrical rod is located under the bar 3. The channels 6 of the collector are connected to the holders of the transducers by flexible hoses 7. The described device is equipped with a pressure regulator.

 The acoustic unit is made in the form of a U-shaped fork 8 (see FIG. 3) rigidly connected to the lower part 5 of the cylindrical rod, at the ends of which large rocker arms 9 are articulated, at the ends of which also small rockers 10 rigidly interconnected in pairs. Between each pair of small rocker arms 10 by means of rotary axes 11 provided with a locking mechanism with the possibility of their axial movement, holders of ultrasonic transducers are installed 12. The holders are made in the form of orthogonal frames arranged one in the other, while the inner 13 is connected to the outer 14 with the possibility of its movement without limiting the degrees of freedom.

 The locking mechanism of the rotary axes 11 is made in the form of bushings 15 and 16 mounted in the outer 14 and inner 13 of the holder and covering the rotary axis 11, on which grooves 17 are made, interacting with the annular spring 18.

 The pressure regulator is made in the form of a sector 19, rigidly fixed on the upper rotary part of the cylindrical rod, with openings 20 located on the periphery of its curved portion interacting with the fixing element 21.

 The described device operates as follows.

 The bracket 1 is rigidly attached to the end of the lever of the mechanism for moving the housing along the outer surface of the controlled product (object). As the movement mechanism, a grinding machine can be used. In the described example, the bracket 1 is rigidly fixed to the end of a fixed-length lever pivotally mounted on a support (or bed) of a grinding machine (not shown) with the possibility of it (lever) moving up and down relative to the horizontal axis of the product.

 To conduct ultrasonic testing, the lever together with the acoustic unit is lowered onto the surface of the controlled product, for example, the conical or cylindrical surface of the support or work roll of the rolling mill, turn the bar 3 so that the vertical ends 23 coincide with the continuation of the radius of the controlled object, and fix the rod 21 in the corresponding hole sectors 19.

 After this operation, uniform pressure is provided on the axis 11 of the small rocker arms 10 and, accordingly, on the frames 14 and 13, in which the piezoelectric transducers 12 are fixed.

 After that, the cranes of 24 channels 6 of the collector are opened and contact liquid (water) is introduced under the piezoelectric transducers.

 Then, the rotation of the spindle of the machine (or other object-rotating device, such as a roller tilter) is turned on and the support of the turning-grinding machine (or any other mechanism) moving the acoustic unit along the control object is turned on.

 When the control object is rotated together and the acoustic unit is linearly moved, scanning by ultrasonic beams generated by all transducers (at different input angles) along a helical path occurs.

 The scan step is usually 1.5-2.0 D, where D is the diameter of the piezoelectric element.

After sounding in one direction, the spring-loaded latch 22 extends and the entire acoustic unit rotates 180 ^o . Then sounding is performed in the opposite direction.

 When you turn the acoustic unit, the fitting 25 of the water supply remains stationary, and the design of the sealing system 26 eliminates the possibility of overlapping flexible hoses 7.

 Sounding is performed by all channels simultaneously. Echo signals from discontinuities are processed, displayed on the display and entered into the memory (for example, flash memory, flash card). At the same time, coordinate signals from the tracking system are entered into the memory. After the control, all information is processed on a PC, analyzed and archived.

 To simplify the sensitivity settings, the transducer 12 is removed from the frame 13. For this, the axis 11 is extended and removed from the interaction with the annular spring 18 with its subsequent fixation in the groove 17.

 Thus, the described device allows you to distribute the pressure on the transducers evenly regardless of the curvature of the surface of the controlled product (including with a conical surface), which stabilizes the quality of the acoustic contact and increases the reliability of the control results. In addition, the acoustic unit can be rotated without interference for flexible hoses connecting the collector channels to the transducer holders, and it is also possible to remove frames with transducers and to carry out the standardization of each transducer separately.

 Production tests of the device confirmed its high reliability and ease of operation with high reliability of the control results.

Claims (3)

 1. Device for ultrasonic testing of cylindrical products, for example, backup rolls of rolling mills, comprising a housing in the form of a bracket, an acoustic unit with holders of ultrasonic transducers and a contact fluid supply unit, characterized in that the bracket 1 is made in the form of a plug, between the ends 2 of which are installed strap 3, on which the cylindrical rod of the contact fluid supply unit is orthogonally mounted, consisting of a rotatable upper 4 part located above the strap 3 and a lower hollow part 5, made In the form of a distribution manifold located under the strap 3, the collector channels 6 are connected to the transducer holders by flexible hoses 7, it is equipped with a pressure regulator for the transducers, the acoustic unit is made in the form of a U-shaped plug 8, rigidly connected to the lower 5 part, at the ends of which large rocker arms 9 are articulated, at the ends of each of which also small rockers 10, rigidly interconnected in pairs, are articulated between each pair of small rocker arms 10 by nabzhennyh lock mechanism 11 pivots with the possibility of axial displacement of ultrasonic transducers mounted holders 12, each of which is in the form disposed one in the other orthogonal framework, the inner 13 connected to the outer 14, with its movements without limitation degrees of freedom.  2. The device according to p. 1, characterized in that the supporting mechanism of the rotary axis 11 is made in the form of bushings 15 and 16 installed in the outer 14 and inner 13 of the holder and covering the rotary axis 11, on the cylindrical surface of which grooves 17 are made, interacting with ring spring 18.  3. The device according to p. 1 or 2, characterized in that the pressure regulator on the transducers is made in the form of a sector 19 fixed to the upper rotary part 4 of the sector with openings 20 located on the periphery of its curved section interacting with the fixing element 21.

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