RU2298180C2 - Device for ultrasonic test of sheet metal - Google Patents

Abstract

FIELD: testing engineering.

SUBSTANCE: device comprises two platforms. The first platform is mounted for permitting movement transversely to the sheet to be tested, and the second platform is unmovable. The movable platform is provided with beams having electromagnetic acoustical converters. The beams have pickups of displacements and pickups of position of the sheet edges. The unmovable platform mounted in front of the movable platform in the direction of movement of the sheet is provided with optical pickups.

EFFECT: enhanced reliability.

13 dwg

Description

Technical field

The invention relates to methods for non-destructive testing of hot and cold sheet metal using electromagnetic acoustic transducers.

State of the art

A known method of ultrasonic testing and a device for its implementation [1]. The device contains enclosures on which acoustic transducer blocks are mounted, means for moving the enclosures, a sensor for measuring the distance traveled with an indicator of the presence of acoustic contact, a flaw detector with a microprocessor. The cases are interconnected with the possibility of changing the distance between them and fixing in different positions. The acoustic transducer blocks are spring-loaded relative to the housings, and a spring-loaded sensor for measuring the distance traveled is installed on one of the housings.

The disadvantage of this device is the impossibility of continuous movement of buildings with blocks of acoustic transducers relative to each other. These movements are carried out in a known device using the adjusting-fixing mechanism, and the extension of the housings is performed manually.

In addition, the spring suspension of the converter units does not guarantee them from damage when sliding over the surface of the sheet.

A known method of non-contact ultrasonic testing of long products and pipes and an installation for its implementation [2], comprising a transport line with drive and non-drive rollers, a multi-channel marker, a scanning mechanism with several transducer blocks, displacement meters of the controlled object and an optical sensor located at the point of origin of the axes coordinates.

However, in the known device, the transducer blocks are placed at certain distances from each other along the control object and cannot move relative to the control object when its position in space changes, which can lead to an error in determining the coordinates of the front or rear end and malfunction of the marker and reduce efficiency scan.

A device for detecting defects using ultrasound, comprising an ultrasound scanner with an ultrasound probe for two-dimensional scanning of the surface of the sheets, a drive for the scanner and a computing unit that controls the scanner, adopted as a prototype [3].

However, in the known device there are no mechanisms for automatically searching the longitudinal and transverse edges of the surface of the object of control. In addition, when scanning the controlled sheet is stationary, which makes it impossible to use the known device when the sheet is moving, for example, along the rolling table.

Disclosure of the invention

The basis of the invention is the task of creating a device for ultrasonic testing of sheet metal, which would ensure the optimal location and continuous movement of the blocks of ultrasonic transducers depending on the position of the sheet and the automatic search for its longitudinal and transverse edges during movement along the roller table to ensure 100% control density.

The problem is solved in that the device for ultrasonic testing of sheet metal containing blocks of electromagnetic-acoustic transducers, position sensors of the sheet relative to the axis of the roller table and the automation system, according to the invention, is made in the form of two platforms (11, 53), one of which (11) installed with the possibility of movement across the sheet, and the other (53) is fixed, at least two beams (2, 3) with lines of electromagnetic-acoustic transducers (32) for ultrasonic testing of the base metal and one beam (1) with a block of electromagnetic-acoustic transducers (32) for searching and monitoring the left edge of the sheet, the first beam (2) with a line of electromagnetic-acoustic transducers for ultrasonic testing of the base metal is fixed on it, the second beam (3) with a line of electromagnetic-acoustic transducers for ultrasonic testing of the base metal is installed with the possibility of movement along the longitudinal axis of the platform (11) across the sheet (25), the beam (1) with block m of electromagnetic-acoustic transducers for searching and ultrasonic monitoring of the left edge of the sheet is mounted on a movable platform (11) with the possibility of moving parallel to its longitudinal axis a distance greater than half the width of the sheet being monitored, a position sensor for the longitudinal right edge of the sheet is installed on the second beam (3) ( 8, 9), rigidly connected to the beam, a drive with a linear displacement sensor (15, 16), providing a predetermined position of the beam relative to the edges of the sheet and the first beam (3) and a predetermined overlap of the control zones the lines of electromagnetic-acoustic transducers, on the first beam (2) there is a position sensor for the longitudinal right edge of the sheet (6, 7), rigidly connected with the beam and the platform (11), on the beam (1) with the block of electromagnetic-acoustic transducers (32) To search and control the left edge of the sheet, a drive (13) with a linear displacement sensor (14) is installed, which provides a predetermined position relative to the left edge of the controlled sheet, and a position sensor of the longitudinal left edge (4, 5) of the sheet (25), on a fixed platform (53 ) installed in front of the movable platform (11), in the direction of the controlled sheet (25), symmetrically relative to the axis of the roller table, there are installed blocks of optical sensors (31) for searching the longitudinal edges of the controlled sheet, equipped with drives (17, 19), and stationary optical sensors (56, 57 ) for detecting a sheet under a fixed platform, measuring rollers (24, 27, 30) installed on the opposite ends of the platform, on the fixed platform and on the rail of the moving platform, to determine the position coordinates of the front and rear transverse to Omoko controlled sheet (25), and before the fixed platform mounted bars (21, 22) with optical sensors (87, 88) to control the shape of the transverse edges of the sheet being inspected and to determine the beginning and end of ultrasonic testing. Sensors (4, 6, 8) of the position of the longitudinal edges of the controlled sheet 25 contain a frame, an idle lever, a hinge, an axis, a rod, a drive lever, a pneumatic cylinder with a magnetic ruler on the rod, an axis, a contact, to the center of which a reading device for linear displacement is attached, spherical hinge, pads, stopper, emphasis, sleeve, screw, cover, bracket, and the movement of the center of the contactor corresponds to the movement of the point lying in the middle between the pads.

Having detected the front edge of the sheet with optical sensors on a fixed platform, the automation system determines the roughness of the front transverse edge and the beginning for ultrasonic inspection of the sheet.

Next, the sheet is transported to the search area of the longitudinal edges. The movement control of the sheet is carried out according to the testimony of displacement sensors (for example, encoders).

When a sheet enters the search area for longitudinal edges, the right and left blocks of optical sensors perform the search algorithm for the right and left edges of the sheet. The position of the longitudinal edges of the sheet relative to the axis of the roller table is controlled by the readings of displacement sensors (encoders).

After the right and left edges of the sheet are found, information about their position is transmitted to the drives of the movable platform, the movable beam with the lines of electromagnetic-acoustic converters and the beam with blocks of electromagnetic-acoustic converters to search and control the left edge of the sheet. According to these indications, the automation system positions the specified devices in the position of the edges found. The position of the movable platform and beams with rulers of electromagnetic-acoustic transducers relative to the axis of the roller table is controlled by the readings of the corresponding displacement sensors (encoders).

When the sheet enters the work area of the beam with a block of electromagnetic-acoustic transducers for searching and ultrasonic testing of the left edge of the sheet, the movable platform moves towards the left edge of the sheet until the edge is detected by a mechanical tracking sensor. In the process of sheet control, the position of the block of electromagnetic-acoustic transducers relative to the left edge of the sheet is maintained according to the readings of this sensor.

When the sheet enters the work area of the beam with a line of electromagnetic-acoustic transducers fixed motionless on a movable platform, the platform moves toward the right edge of the sheet until the edge is detected by a mechanical tracking sensor. In the process of sheet control, the position of the line of electromagnetic-acoustic transducers relative to the right edge of the sheet is maintained according to the readings of this sensor. Correction of the position is carried out by moving the platform. Monitoring the position of the platform is carried out according to the readings of the displacement sensor (for example, encoder). The number of electromagnetic-acoustic transducers that control this sheet is determined based on the sheet width according to the readings of the optical search sensors and the position of the longitudinal edges of the sheet.

When the sheet enters the working area of the movable beam with a line of electromagnetic-acoustic transducers, the movable beam moves towards the right edge of the sheet until the edge is detected by a mechanical tracking sensor. In the process of sheet control, the position of the line of electromagnetic-acoustic transducers relative to the right edge of the sheet is maintained according to the readings of this sensor. Correction of the position is carried out by moving the beam with a line of electromagnetic-acoustic transducers. The position of the movable beam with a line of electromagnetic-acoustic converters is controlled by the readings of the displacement sensor (encoder). The number of electromagnetic acoustic transducers (EMAT) that control this sheet is determined based on the sheet width according to the readings of optical search sensors and the position of the longitudinal edges of the sheet.

Brief Description of the Drawings:

figure 1 depicts a diagram of a device for ultrasonic testing of sheet metal in plan;

figure 2 - arrangement of EMAT blocks for monitoring the base metal and the left longitudinal edge of the sheet on a movable platform relative to the controlled sheet;

figure 3 - mechanism for moving a movable beam with a ruler EMAT for monitoring the base metal on a moving platform, section aa;

figure 4 is the same, section bB;

5 is the same, section bb;

6 is a mechanism for moving a mechanical sensor for tracking the left longitudinal edge on a beam with an EMAT unit mounted movably on a moving platform, section DD;

7 is a stationary platform with blocks of optical sensors, section GG;

Fig.8 is also a cross-section EE;

Fig.9 - mechanical sensor tracking (position) of the longitudinal edges of the controlled sheet;

figure 10 is the same, view And;

11 - the same position of the sensor when changing the position of the controlled sheet in the plan;

12 is the same, view K;

Fig.13 is a view of W on the EMAT unit (Fig.6).

Description of the invention

The device comprises (Fig. 1) a beam 1 with an EMAP 32 block for searching and ultrasonic testing of the left edge of the sheet 25, a beam 2 with an EMAP 32 line for ultrasonic testing of the base metal, a beam 3 with an EMAP 32 line for ultrasonic testing of the base metal, a mechanical sensor 4 the position of the left longitudinal edge with a pneumatic actuator 5, a mechanical sensor 6 of the position of the right longitudinal edge mounted on a beam 2 with a pneumatic actuator 7, a mechanical sensor 8 of the position of the right longitudinal edge with a pneumatic actuator 9, adjustable adjustable electromechanical drive 10 of a movable platform 11 with a sensor (encoder) 12 linear displacements of the platform 11, adjustable electromechanical drive 13 of a beam 1 with a sensor 14 (encoder) of linear displacements of a beam 1, adjustable electromechanical drive 15 of a beam 3 with a sensor 16 (encoder) of linear displacements of a beam 3, an adjustable electromechanical drive 17 with a sensor 18 (encoder) of linear displacements of the block of optical sensors 31 searching for the left longitudinal edge, an adjustable electromechanical drive 19 with a sensor 18 (encoder) l linear displacements of the block of optical sensors 31 search for the right longitudinal edge, the upper line 21 of optical sensors 87 search for the transverse edges of the sheet 25, the lower line 22 of optical sensors 88 search for the transverse edges of the sheet 25, the sensor (encoder) 23 of the measuring roller 24 on a fixed platform 25, the sensor ( encoder) 26 of the measuring roller 27 on the rail track 28 of the mobile platform 11, the sensor (encoder) 29 of the measuring roller 30 on the rail track 28 of the mobile platform 11.

The platform 11 is mounted with the possibility of movement across the sheet 25.

The beam 1 with the EMAT 32 is mounted on a movable platform 11 with the possibility of displacements parallel to its axis by a distance greater than half the width of the controlled sheet 25 (stroke-S). The beam 2 with the EMAT 32 line is mounted on the platform 11 motionless. The beam 3 with the EMAT 32 line is mounted on the platform 11 motionless. The EMAT 32 line mounted on the movable beam 3, in any position, overlaps the EMAT 32 line mounted on the fixed beam 2 (Fig.2).

The mechanism for moving the movable beam 3 with an EMAT line for monitoring the base metal on a moving platform (section A-A; Figs. 3-5) contains a chain gear 33, a bracket 34 right, a bracket 35 left, a suspension 36 left, a suspension 37 right, limit switches 38, clip 39, guide rollers 40, 41, support roller 42, guide rollers 43, guide plate 44.

The movement mechanism (Fig.6) of the mechanical sensor 4 of the position of the left longitudinal edge on the beam 1 with the EMAT unit mounted movably on a moving platform (section DD) contains an electromechanical drive 45 with a sensor 46 for linear movements of the beam 1, bracket 47, frame 48 , chain transmission 49, limit switch 50, carriage 51, cable track 52.

The fixed platform 53 with blocks of optical sensors 31 (Fig. 7, section G-G, Fig. 8, section EE) contains a fixed platform 53, devices 54 and 55 for searching for longitudinal edges, each of which contains optical sensors 56 and 57 for sheet search, carriage 58, cable 59, cable 60 from optical sensors 31, flexible tube from optical sensor unit 31, roller bearings 62, guide 63, leash 64, chain transmission 65, limit switch 66, box 67 of carriage 58, through which is supplied with compressed air for cooling the sensors 31 during flaw detection of hot sheet metal kata.

Mechanical sensors 4, 6, 8 of the position of the longitudinal edges of the monitored sheet 25 (Figs. 9-12, views I, K) comprise a frame 68, an idle lever 69, a hinge 70, an axis 71, a rod 72, a drive lever 73, a pneumatic cylinder 74 with a magnetic with a ruler on the rod, axis 75, contactor 76, to the center of which a linear displacement reading device is attached, spherical joint 77, two plates 78 that touch the sheet 25, stop 79, stop 80, sleeve 81, screw 82, cover 83, bracket 84. Moving the center of the contactor 76 (t.K, Fig. 10) corresponds to the displacement of the point t. C (Fig. 11) lying in the middle between the overlap dkami 78.

Sensors 4, 6, 8 differ from each other only in the way they are attached to the beams 1, 2, 3.

On the beam 1 with the EMAT unit (Fig. 13, view G, Fig. 6), a lifting mechanism for the EMAT unit is mounted, comprising a lever system 85 and a pneumatic cylinder 86.

Description of the device

The sheet 25 is fed along the rolling table to the beam 53, as shown in figure 1. Sensors 56 and 57 detect the appearance of sheet 25 before installation and include a system of optical sensors 87 and 88 located on the upper 21 and lower 22 bars between which sheet 25 is located. The automatic system, receiving signals from the sensors, determines the shape of the front transverse edge of sheet 25 and size l _{1 of the} uncontrolled zone.

At the same time, the measuring roller 24 with the encoder 23 is lowered onto the sheet and the devices 54 and 55 with the optical sensor units 32 are turned on to determine the position of the right and left longitudinal edges of the sheet 25. After determining the shape of the front transverse edge and the position of the longitudinal edges of the sheet 25 relative to the axis of the roller table, the received information is received on the mechanisms of movement of the platform 11, the beam 1 for searching the left edge of the sheet 25 and the beam 3 for searching the right edge of the sheet 25 and lowering the rulers with EMAP-32 at the moment the sheet 25 passes under them.

The automatic system (not shown conditionally) taking into account the sheet width determines the number of active EMAT-32 on the rulers located on the beams 2 and 3 and, receiving information from the sensors 4, 6, 8 of the position of the longitudinal edges of the sheet 25, the sensor 16 of the position of the platform 11 and measuring rollers 27 and 30 with encoders 26 and 29, continuously adjusts the position of the EMAT rulers on the beams 2 and 3 using adjustable electromechanical drives 10, 13 and 15. When passing the rear transverse edge of the sheet 25 through the rulers 21 and 22 with optical sensors 87 and 88 automatic si theme defines the size of ₂ l uncontrolled zones and transmits information on the lifting mechanisms of lines and blocks with EMAT 32 and bringing all the mechanisms in the initial position for reception and start control of the next sheet.

The proposed device provides 100% ultrasonic control of hot and cold sheets of length L, excluding zones l ₁ and l ₂ having a curvature greater than permissible.

Information sources

1. RF patent №2137120.

2. RF patent No. 2238553.

3. US patent No. 6588278.

Claims (1)

A device for ultrasonic testing of sheet metal, containing blocks of electromagnetic-acoustic transducers, position sensors of the sheet relative to the axis of the roller table and an automation system, characterized in that it is made in the form of two platforms, one of which is installed with the ability to move across the sheet, and the other is stationary at least two beams with rulers of electromagnetic-acoustic transducers for ultrasonic control of the base metal and one bulk and with a block of electromagnetic-acoustic transducers for searching and monitoring the left edge of the sheet, the first beam with the lines of electromagnetic-acoustic transducers for ultrasonic control of the base metal is fixed on it, the second beam with the lines of electromagnetic-acoustic transducers for ultrasonic control of the base metal is movable along the longitudinal axis of the platform across the sheet, a beam with a block of electromagnetic-acoustic transducers for search and ultrasound Ukova control of the left edge of the sheet is mounted on a movable platform with the ability to move parallel to its longitudinal axis by a distance greater than half the width of the controlled sheet, on the second beam there is a position sensor for the longitudinal right edge of the sheet, rigidly connected to the beam, a drive with a linear displacement sensor, providing a predetermined position beams relative to the edges of the sheet and the first beam and the specified overlap of the control zones of the sheet with lines of electromagnetic-acoustic transducers, the first beam is set a position sensor for the longitudinal right edge of the sheet, rigidly connected with the beam and the platform, is mounted on the beam with the block of electromagnetic-acoustic transducers for searching and monitoring the left edge of the sheet; the edges of the sheet, on a fixed platform installed in front of the moving platform, in the direction of movement of the controlled sheet, symmetrically relative to the axis of the roller table blocks of optical sensors for searching the longitudinal edges of the controlled sheet, equipped with drives, and stationary optical sensors for detecting the sheet under the fixed platform, mounted at its opposite ends, measuring rollers are installed on the fixed platform and on the track rail of the moving platform to determine the position coordinates of the front and rear transverse edges of the controlled sheet, and in front of the fixed platform, rulers with optical sensors are installed to control the shape of the transverse edges to a controlled sheet and determine the beginning and end of ultrasonic testing.

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