SU1221594A1 - Ultrasonic arrangement for inspecting articles - Google Patents

Abstract

The invention relates to the field of ultrasonic inspection of sheet metal and welded pipes. The purpose of the invention is to increase the reliability of control and increase reliability. The position adjuster sets the nominal size of the gap between the electro-acoustic transducer and the product. During the inspection of the product, the signal from the output of the position sensor of the electroacoustic converter is compared with the signal from the output of the position setter. A signal equal to their differences controls the mechanism for moving the electroacoustic converter. Automatic regulation of the gap between the electro-acoustic transducer and the product ensures constant operation of the electro-acoustic transducer, which increases the reliability of the control. Reliability is achieved by increasing the dynamic range of the control. 1 il. i W ate with 4

Description

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The invention relates to ultrasonic inspection of sheet metal and welded pipes and can be used in nondestructive testing of cold and hot rolled strips, as well as large diameter welded pipes for the presence of surface and internal defects.

The purpose of the invention is to increase the reliability of control and increase reliability.

The drawing shows a block diagram of an ultrasound product inspection device.

The device contains a series of probe pulses 1, an electro-acoustic transducer 2 and a receiver 3, a mechanism 4 for moving an electro-acoustic transducer 2, a setpoint adjuster 5 and a serially connected position sensor 6 of an electroacoustic transducer 2, a comparator 7, the second input of which is connected to position setpoint 5, and an amplifier 8, the output of which is connected to the control input of the mechanism 4 for moving the electroacoustic converter 2. In addition, in the drawing, while Zano-controlled product 9.

The device works as follows.

The position adjuster 5 sets the nominal gap between the electro-acoustic transducer 2 and the product 9. During the inspection of the product 9, the signal from the output of the sensor 6 of the position of the electro-acoustic transducer 2 is fed to the first input of the comparator 7, to the second input of which comes the signal from the output of the set position 5. In the comparator 7, these signals are compared, and a signal equal to their differences, after amplification in the amplifier 8, is sent to the control input of the mechanism, 4

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to move the electro-acoustic transducer 2 relative to the surface of the product 9 until the gap between the electro-acoustic transducer 2 and the surface of the product 9 becomes equal to the nominal value entered into the setpoint adjuster 5.

In this device, due to the automatic adjustment of the gap: between the electro-acoustic transducer (especially when a non-contact electromagnetic acoustic transducer is used as the latter) and the product is under-.

The excitation mode of ultrasonic oscillations in the product is kept constant, which increases the reliability of the control. Due to the large dynamic control range, the possibility of damage to the electroacoustic converter during the control of a product with a wavy surface is reduced, and reliability is increased.

25 operation of the device.

Claims (1)

Invention Formula Ultrasound device for -30 control of products, containing a series-connected probe pulse generator, an electroacoustic transducer and a receiver, a mechanism for moving an electroacus-35 th transducer, characterized in that, in order to increase the reliability of the control and increase reliability, it is equipped with a position setter and sequentially connected position sensor an electroacoustic converter, a comparator, the second input of which is connected to the setpoint adjuster, and an amplifier, the output of which I o is connected to the control input of the mechanism for moving an electroacoustic transducer.