SU798736A1 - Apparatus for monitoring welded article butts - Google Patents

Description

The invention relates to television automation and can be used in automatic electron beam guidance systems at the junction of welded products.

Known devices for automatic guidance of the tracking strobe in the middle of the controlled object, containing two circuits of shock excitation, connected to zero indicators, the outputs of which are connected to the inputs of the trigger fl].

Closest to the proposed. in technical essence, it is a device for tracking the joints of welded products, containing a scan-line sensor and a video amplifier connected in series, a fantron, a strobe generator and a strobe middle extraction unit connected in series, the output of which is connected to the first input of the first trigger, a threshold discriminator and a second trigger connected in series, moreover the second inputs of the triggers are connected to the output of the clock generator, and the outputs to the inputs of the adder, the output of which through the integrator li ne phantastron to the control input, and an output of the video amplifier connected to the input of the threshold discriminator, the output connected to the first home vho5 second trigger f2].

The disadvantages of the known device are the low accuracy of pointing the middle of the gate to the middle of the controlled object and low 10 noise immunity of the device.

The purpose of the invention is improving the accuracy and noise immunity of the device.

, 5 The goal is achieved in that the device comprises an included symmetric pulse generator associated with the control input of the scanning sensor.

In FIG. 1 is a block diagram. device ma; in FIG. 2 - timing diagrams.

The device comprises a television sensor 1, a sweep generator 2, a VI25 de-amplifier 3, a threshold discriminator 4, a clock generator 5, a second trigger 6, a science fiction device 7, a strobe generator 8, a mid-strobe allocation unit 9, a first trigger 30 J., an adder 11. integrator 12, horizontal sync pulses 13, video signal 14, output signals 15 and 16 of the second trigger 6, pulse 17 of the strobe, output pulse 18 of the block 9 highlighting the middle of the strobe, output pulses 19 of the first trigger 10, signals 20 and 21 of the error pulse.

The device operates as follows.

A video signal is taken from the output of the television sensor, which is amplified by a video amplifier 3, formed by a threshold discriminator 4. The video signal 14, taken from the threshold discriminator 4, is fed to the first input of the second trigger 6, the second input of which * ”is received from the clock generator 5 by the horizontal sync pulses 13. Since the generator 2 sweep is a symmetric pulse generator associated with the control input of the scanning sensor, and the forward and reverse sweeps are read, then the second trigger will be t start alternately, either from the front, then from the cutoff of the pulse from the junction of the welded products. At the same time, the signals 15 and 16 are alternately removed from the output of the second trigger 6. '“Horizontal sync pulses 13 are fed to the second input of the first trigger 10, and pulses 18 from the output of the middle of the strobe 9 are pulled to the first input, and pulses 19 are removed from the output of the first trigger 10. The output pulses 19 from the first trigger 10 and the second trigger 6 are summed by the adder 11, which removes the error signal 21 or signal 20 depending on the direction of the scan. This error signal is brought to the input of the integrator 12, the output signal of the integrator 12 is controlled by a scintron 7, the output signal of which, acting on the generator 8 of the strobe, changes the position of the pulse 17 of the strobe in such a way that the cut-off of the block 9 of the allocation of the middle of the strobe coincides with the middle of the pulse from the junction welded products.

Claims (2)

The invention relates to television automation and can be used in automatic electron beam tracking systems at the interface of the products to be welded. Devices are known for automatically pointing the next strobe to the middle of the object to be monitored, which contain two shock excitation circuits connected to null indicators, the outputs of which are connected to the trigger inputs l. The closest to the proposed technical entity is a device for tracking the joints of welded products, containing sequentially connected scanning sensor and video amplifier, successively connected faitastron, strobe generator and unit for extracting the middle of the strobe, the output of which is connected to the first input of the first trigger, serially connected the threshold discriminator and the second trigger, the second inputs of the triggers are connected to the output of the clock generator, and the outputs to the inputs of the adder, Exit is via atop integ connected to the control input phantastron, video amplifier and an output connected to an input of the threshold discriminator, the output connected to the first input of the second flip-flop 2. The disadvantages of the known devices are low accuracy strobe mid-pointing to the middle of the controlled object and a low noise immunity of the device. The purpose of the invention is to improve the accuracy and noise immunity of the device. The goal is achieved by the fact that the device contains a symmetric pulse generator connected with the control input of the scanning sensor. FIG. 1 shows a block diagram. device ma; in fig. 2 - time diagrams. The device contains a television sensor 1, a sweep generator 2, a video amplifier 3, a threshold discriminator 4, a synchro generator 5, a second trigger 6, fadron 7, a gate generator 8, a strobe middle selection block 9, the first trigger 10 .. adder 11. integrator 12, horizontal sync pulses 13, video signal 14, output signals 15 and 16 of the second trigger 6, strobe pulse 17, output pulse 18 of the middle strobe selection block 9, output pulses 19 of the first trigger 10, error pulse signals 20 and 21. The device works as follows. From the output of the television sensor 1, the video signal is amplified, which is amplified by the video amplifier 3, formed by the threshold discriminator 4. The video signal 14 removed from the threshold discriminator 4 video signal 14 is fed to the first input of the second trigger 6, to the second input of which are received the sync pulses from the generator 5, sync pulses 13. Since sweep generator 2 is a symmetric pulse generator associated with a control input of a scanning sensor, with forward and reverse sweeps being read, then second trigger b It will start alternately, then from the front / then from the medium for the impulse from the joint of the products being welded. In this case, the signals 15 and 16 L alternately are outputted from the output of the second trigger. Second sync pulses 13 are supplied to the second input of the first trigger 10, and the first input is pulses 18 from the strobe center selection block 9, and the pulses 19 are removed from the output of the first trigger 10. the pulses 19 of the first trigger 10 and the second trigger b are summed by adder 11, which removes the error signal 21 or the signal 20 depending on the sweep direction. This error signal is input to the integrator 12, the output signal of the integrator 12 is controlled by fiction 7 / whose output, acting on the strobe generator 8, changes the position of the strobe pulse 17 so that the cut of the pulse of the strobe midpoint block 9 coincides with the midpoint of the pulse from the joint welded products. Claims Device for tracking joints of products to be welded, containing sequentially connected scanning sensor and video amplifier, serially connected fadron, strobe generator and strobe middle input unit, the output of which is connected to the first input of the first trigger, successively connected threshold discriminator and second trigger, the second inputs flip-flops are connected to the output of the clock generator, and the outputs are connected to the inputs of the adder, the output of which through the integrator is connected to the control The main input is fadron, and the output of the video amplifier is connected to the input of a threshold discriminator connected to the first input of the second trigger, characterized in that, in order to improve the accuracy and noise immunity of the device, it contains a generator of symmetrical pulses associated with the control input of the scanner and sensor. Sources of information taken into account in the examination, 1. The author's certificate of the USSR №343529, cl. 23 K 15/00, 1972. 2. USSR author's certificate No. 360644, cl. G 05 O 3/04, 1972 (prototype).