RU2253111C2 - Control line for cylindrical articles - Google Patents

Abstract

FIELD: nuclear physics.

SUBSTANCE: line has device for changing geometric parameters of article and device for ultrasound control of geometric dimensions of device and device for ultrasound control of abutment of article cover to core. Measurement systems of above-mentioned devices are interconnected by comparison block. Inputs of comparison block are connected to block for registering geometric dimensions values, and outputs are connected to control block by step engine for moving piezoconverters for measuring abutment of cover against core. Piezoconverters are coupled in parallel manner and in each couple are mounted at different distance from article. Transporting device with collectors is made in form of driven fork switches and pallets, which are jointly interconnected and mounted on posts in levels.

EFFECT: higher productiveness, higher precision, higher efficiency.

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Description

The invention relates to instrumentation and is intended for geometric and ultrasonic testing of multilayer products, in particular, measuring geometric dimensions and controlling the fit of the shell to the core of the fuel elements of research nuclear reactors.

A device for measuring the geometric dimensions of fuel elements according to the patent of the Russian Federation No. 2178140, containing light sources, photodetectors, transportation unit, control units and information processing.

Also known is a device for ultrasonic monitoring of the fit of the shell to the core of fuel elements according to the patent of Russian Federation No. 2187104, containing measurement units, transportation units, control units and information processing.

The disadvantage of these devices is a separate measurement of different parameters of the fuel element, which reduces the performance of the integrated measurement, and further measurements do not take into account the individual results of the previous measurement of each fuel element, which reduces the accuracy of the measurement.

The closest in technical essence and the achieved result is an automatic line for controlling fuel elements (see RF patent No. 2128111, MKI B 25 J 9/00, pr. 04/22/1997, published in bulletin No. 9, 03/27/1999 - prototype), comprising a device for measuring geometric dimensions, a device for measuring the fit of the shell to the core with measurement and control systems for each of them, a transporting device and storage devices, the disadvantage of which is low productivity and accuracy of measurement, due to the need to repeatedly th check of some products for the fit of the shell to the core due to the spread of geometric dimensions in the extreme tolerance.

An object of the invention is to increase the productivity and accuracy of control.

The problem is solved in that in the control line of cylindrical products containing a device for measuring geometric dimensions, a device for measuring the fit of the shell to the core with measurement and control systems of each of them, a transporting means with drives, according to the invention, the measurement systems of each device are interconnected by a unit comparison, the inputs of which are connected to the unit for registering values of geometric dimensions, and the outputs are connected to the control unit for step motors Piezoelectric transducers measure the fit of the shell to the core, piezoelectric transducers are paired in parallel and installed in each pair at different distances from the surface of the product, and the transporting device with drives is made in the form of drive fork cranes and trays that are pivotally connected to each other and tier mounted on the axes of the rack.

The specified set of features is new, not known from the prior art, and allows us to solve the problem, since the transfer of values to the comparison unit allows to increase the measurement accuracy due to the fact that, given the individual dimensions of the controlled product, a constant distance between the piezoelectric transducer and the surface of the controlled product is maintained and, thus, the size of the ultrasonic spot of the piezoelectric transducer in the control zone is maintained, paired in parallel connected piezoelectric transducer allow to increase the accuracy of control by increasing the number of sensing at each point of control while maintaining the performance of the control, and a transporting means with design features eliminates jamming of products on trays due to constant limited self-oscillations.

The invention is illustrated by drawings.

Figure 1 presents a block diagram of a line, figure 2 is a General view of a device for monitoring geometric dimensions.

The control line for cylindrical products consists of a unit 1 for supplying products to a device 2 for controlling geometric dimensions, a unit 3 for sorting products after controlling geometric dimensions, a unit 4 for supplying products for a device 5 for controlling the fit of the shell to the core, and a unit 6 for sorting products after controlling for the fit of the shell to the core with drives 7 suitable and 8 defective products. The designs of devices 2 and 5 are as unified as possible.

In the line, each product supply unit consists of forklifts 9 and trays 10, which are pivotally connected to each other and mounted on the axes 11 of the rack 12.

The measuring channel of the geometric dimensions control device 2 consists of a block 13 of illuminators with a collimating lens, a block 14 of projecting lenses with a photodiode array, a block 15 of a buffer storage device, a block 16 of an analog-to-digital converter, a block 17 for digital information processing, and a comparison block 32 installed in the computer 18.

The measuring channel of the device 5 for monitoring the fit of the shell to the core consists of piezoelectric transducers 19, 20, 21, 22, a control unit 23, an ultrasonic vibrations generator 24, a switch 25, an ultrasonic vibrations receiver 26, an analog-to-digital transducer 27 installed in the computer 18. Comparison unit 32 has outputs I and II, which are connected to control units 28, 29 of stepper motors 30, 31 for moving the piezo transducers 19-22, outputs III, IV of which are connected to the units of sorting 3, 6, and input I is connected to the output of digital block 17 work information.

The line works as follows.

From the trays 10 of the product, one forklift truck 9 is fed to the device 2 control geometric dimensions. The measurement based on the optoelectronic method is carried out by illuminating the product with a parallel beam of light, its shadow image is scanned using a multi-element photodetector.

Each meter has two channels (illuminator - projection lens, photodiode array). One channel sees one edge of the product, the second - the other edge of the product. Having processed information from both channels together, the value of the diameter or height of the product in this section is obtained. Carrying out measurements in several sections, the measurement results are entered into block 15 of the buffer storage device and then through block 16 of an analog-to-digital converter to block 17 of digital information processing with a serial interface and then via a monochannel to comparison unit 32 installed in the system unit of computer 18, which determines the suitability of the product, and also compares the obtained values of suitable products with nominal values and, in the case of deviation of the obtained values from the nominal ones, from the output of I comparison unit 32 to input d grading unit 3 receives a signal on the validity of the product; the rejected product by the unit 3 of product sorting is sent to the drive 8 defective products.

A suitable product by the product supply unit 4 is supplied to the device 5 for monitoring the fit of the shell to the core. From the output II of the comparison unit 32 to the input of the control unit 28 of the stepper motor 30 for moving the piezoelectric transducers 19 and 20 of the control unit for the fit of the shell to the core, controlling the fit of the shell along the generatrix of the product, a signal is received to move the piezoelectric transducers 19, 20 by an amount equal to the difference between the nominal and received values the dimensions of the product diameter by the geometric control unit, and from the output of the III comparison unit 32 to the input of the control unit 29 of the stepper motor 31 for moving the piezoelectric transducers 21, 22, the control which are adjacent to the core to the core at the end of the product, a signal is received to move the piezoelectric transducer by a stepper motor by an amount equal to half the difference between the nominal and received values of the height of the product by the geometric control unit.

The signal from the output of the piezoelectric transducer 20 to the input I of the control unit 23 controls the fit of the shell to the core, from the output of I block 23 to the input I of the generator 24 of ultrasonic pulses, the trigger signal for ultrasonic pulses is received, and the output II of the control unit 23 controls the fit of the shell to the core to the input I of the switch 25, the switching permission signal of the first measuring channel, consisting of piezoelectric transducers 19 and 21, connected in parallel, but spaced in space so that the signal output from the transducer 19, reflected from the product and returned to the piezoelectric transducer 19 earlier than the signal reflected from the product, coming from the piezoelectric transducer 21, would return to the piezoelectric transducer 21.

After the return of the reflected signal to the piezoelectric transducer 21, the switch 25 supplies a signal from the ultrasonic pulse generator 24 to the second measuring channel, consisting of piezoelectric transducers 20, 22 connected and spaced in space similarly to the first measuring channel. The signals reflected from the product through the switch 25, the receiver 26 of ultrasonic signals and the analog-to-digital Converter 27 are received in the comparison unit 32, where their parameters are used to make a conclusion about the suitability of the product.

From the output I of the comparison unit 32, the signal on the product validity is received at the input of the rejecting unit 6, and the rejected product by the product rejecting unit 6 is sent to the defective product storage 8. The product recognized as valid by the unit 6 of product sorting is sent to the drive 7 suitable products.

Thus, the use of the invention allows to increase the accuracy of control of products and to control products of various sizes.

Claims (1)

A control line for cylindrical products, containing a device for measuring geometric dimensions, a device for measuring the fit of the shell to the core with measurement and control systems for each of them, a transporting device with storage devices, characterized in that the measurement systems of each device are interconnected by a comparison unit, the inputs of which are connected with a unit for recording values of geometric dimensions, and the outputs are connected to a control unit for stepper motors for moving the piezoelectric transducers of measurement the shell adjacent to the core, the piezoelectric transducers are paired in parallel and installed in each pair at different distances from the surface of the products, and the conveyor means with drives are made in the form of drive fork cranes and trays that are pivotally connected to each other and tier mounted on the axes of the rack.

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