SU463061A1 - Device for automatic ultrasonic inspection of products - Google Patents

Description

one

The invention relates to the field of flaw detection, namely, devices for automatic ultrasonic inspection of products.

Flaw detectors containing a synchronizer, a generator of radio pulses, an amplifier, an oscillographic indicator, a depth gauge device, an automatic signaling device for defects, consisting of a selector, a waiting multivibrator, and a power amplifier, whose anode load serves as an electromagnetic relay, are known. Such devices are inconvenient because they do not register the position of the defective areas of controlled products on the chart tape.

The proposed device differs from the known ones in that it is equipped with a reversible motor connected at the output of the control unit, the shaft of which is connected via magnetic clutch to moving systems of multivibrator and recorder resistors closed in the extreme positions of moving systems of resistors by two limit switches, one of which is included in the resistor circuit of defects, and the other - in the circuit of the device for automatic sorting of products.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 is an electrical circuit of the control unit.

The device for automatic ultrasonic testing of products includes a synchronizer 1, a standby multivibrator 2, a selector 3, a generator of radio pulses 4, an emitting skimming head 5, an acoustic bath 6 with a product, a receiving skull head 7, a high-frequency amplifier 8, a control unit 9, a defect recorder 10, a recorder 11, an automatic sorting device 12, a reversing motor 13, a magnetic coupling 14. variable resistors 15, 16 and relays 17, 18.

The device works as follows. The synchronizer 1 starts the generator of radio pulses 4 and the waiting multivibrator 2. A generator of radio pulses excites the piezoelectric element of the search head 5, the ultrasonic pulse of which, passing through the controlled product, is received and converted by the skull head 7 into an electric pulse. This pulse is amplified by the amplifier 8, is fed to the selector 3 and further to the control unit 9 associated with the multivibrator 2, the defect recorder 10,

a recorder 11 and an automatic sorting device 12. A high-frequency pulse from the selector arrives at the control grid of the lamp 19 of the control unit and opens it. As a result, the relay 17 is activated and changes the direction of rotation of the engine 13.

The rotation of the motor shaft is transmitted to the movable system of the resistor 15, which is installed in the control circuit of the duration of the immersion multivibrator 2.

As long as the pulse produced by multivibrator 2 is longer in terms of the propagation time of the ultrasonic signal in the product, the moving resistor system moves in a certain direction. As soon as the pulse duration becomes shorter, the selector does not drop this signal onto the grid of the lamp 19, the lamp closes and the engine starts to rotate in the opposite direction. In the process of monitoring, the propagation time of the ultrasound signal in the product changes, and the reversing motor 13, moving the moving variable of the variable resistor, tracks this change. The movable system of the resistor 16 is fixed on the same axis with the nodovym system of the resistor 15, which ensures their synchronous movement. A resistor 16 is installed in the input circuit of the recorder, recording the time of signal propagation in the product, which is normal to the voltage taken from the resistor. If the propagation time of the ultrasound in the product is more or less than the specified interval of its change, or the signal disappears completely on the receiving head 7, the corresponding limit switches of the resistors will be activated. The closed contacts of the limit switches of the resistor 16 can be used to mark the defect or turn on the alarm, and the resistor 15 - after the

relay 18, to block the contacts of the limit switches until the end of control of this product. When the product leaves the monitoring zone, the contacts in the acoustic bath are closed, the control unit 9 receives a signal to the automatic sorting device 12, and defects are recorded on the recorder tape.

Subject) j d ecting

A device for automatic ultrasonic testing of products, containing successively connected synchronizer, generator of radio pulses, two searching heads, amplifier, selector, waiting for a multivibrator with a variable resistor at its time, 1, circuit, recorder, variable resistor, connected to the recorder input with a moving contact control unit with

two actuating relays, a defect recorder and a device for auto matic sorting of products, characterized in that, in order to record the correct defective areas of controlled products on a diagram

tape, it is equipped with a reversible motor connected to the output of the control unit, the shaft of which, through a magnetic coupling, is connected to movable systems of multivibrator and recorder resistors, which are closed

In the extreme positions of the moving resistor systems, there are two limit switches, one of which is connected to the stub of the defect recorder and the other to the circuit of the device for automatic sorting of products.

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