Photoelectric device for measuring the diameter of the rolling product

 

(57) Abstract:

Use: area of non-contact measurements of diameters of cylindrical apply the inventive device includes an image sensor 4 connected to the image sensor 4 connected in series counter 6 number of implementations, additional counter 8 counter 9 squitter pulses, the register 10, a decoder 11 and the led 12, and the first imaging unit 5 measuring pulse, the first divider 6 frequency. The image sensor 4 is connected in series United peak detector 14, figure 15 analysis circuit 16 of the power supply control point light source, the power supply unit 17, a point light source 1, is optically connected through the collimator 2, and the measured product with the image sensor 4, and the second imaging unit 13 of the measuring pulse scheme OR 18, the first key 19, a second divider 20 frequency and the second key 21. 6 Il.

The invention relates to a device for the contactless measurement of the diameters of the conductors, cables, drills, laser beams, hot and cold rolled rod and other cylindrical tel.

Currently, there are many industrial processes in which the contact methods itie methods cannot be used (for example, in the manufacture of cables, hot and cold rolled steel bar and so on), because they cause damage to either the measured product, or measuring devices.

A device for contactless measurement of the diameter of the cylindrical bodies a device for photoemulsion diameter measurement [1] contains the source collimated beam of light, a controlled product, the device forming a shadow image and field of view on the basis of the disk with two fixed cutouts and a photodetector opposite to these cuts, the former measuring the momentum of one of a sensor and a pulse shaper field of view of the device and the controlled pulse counter filling of the measuring pulse, the memory register and indicator, the measurement result. In addition to outlined in this unit has a plan for increasing noise immunity, a technical solution which is not considered by the authors.

The device operates as follows. Light collimated light source falls on a controlled product. When deploying a shadow image of the product using a disk with a notch on the periphery of the pulse shaper generates a measuring pulse from the first fotopriemnik is the dropping to light through the cut edge of the disc. Measuring pulse is supplied to one input element And to the second input of which receives the squitter pulses from the pulse generator. With the output element And the pulses arrive at the counting input of the counter. The result of counting is overwritten in the memory register, the outputs of which are connected indicator.

The disadvantage of this device lies in the presence of mechanical parts, low performance and lack of strict synchronization of the rotational speed of the drive and frequency of the pulse generator fill. The latter determines the low accuracy of the device.

The closest technical solution of the invention is a device for measuring the diameter of the products [2] contains one connected to the image sensor, the imaging unit of measurement pulses, the circuit And the unit of the pulse cycle register and indicator, and the frequency divider, additional counter unit counting the number of implementations and decoder.

The device operates as follows. The image sensor (DI) (CCD - line, photodiode line) generates a video signal corresponding to a shadow image of the article diameter projected on the photodetector of the ruler. The video signal is supplied to vdin the input circuit And, to the second input of this circuit serves heartbeats DI. So acting on the output of the circuit And in the presence of a pulse from the output of the pulse shaper is formed by a bundle of pulses whose number is proportional to the diameter of the measured product. To provide the necessary scale information on the indicator (measurement directly in millimeters) in the device entered the frequency divider included immediately after the scheme I. Tutu pulses after frequency divider is fed to the input of the counter, and if necessary, averaging over 10 realizations of the input to the second decimal digit of the counter, and when averaged over 100 realizations of the input 1 digit digit decimal counter, the output of which pulses arrive at the input of the main counter, where and accumulated. If the averaging is not necessary, called the bundle of pulses fed to the input of the main counter. Simultaneously with the pulse counter filling is the number of realizations of the signal unit counting the number of realizations (BSCR), consisting of two decimal places, and use one or two digits BSCR when averaged over 10 or 100 implementations or none if averaging is not performed. When the output BSCR will be entered into the register of the device, and after a slight delay it the same pulse is reset by a pulse counter filling. The information entered in the commercial register, easy to be interpreted and displayed on the indicator.

The disadvantage of this device lies in the instability of readings related to the temperature dependence of the analog elements of the device, as well as instability of the power supply. In addition, the accuracy of the device depends on the dynamics of the object associated with the fluctuation of the product or by moving it relative to the surface of the photodetector with high speed and on the diffraction of light at the boundaries of the measured product.

The aim of the invention is to improve the accuracy and expand its functionality.

This objective is achieved in that the device containing the image sensor and is connected to the output signal of the reset image sensor connected in series count implementations, additional counter, pulse counter filling, a second input coupled to the input of a counter, a register, a second input connected to the second output count of the number of implementations, decoder and display, as well as the first driver of measuring connected with the third output of the image sensor, added a second shaper measuring pulse, a peak detector, circuit analysis, control circuit power supply, power supply, a point light source, the scheme OR the second frequency divider, the first and second keys, and the output signal of the image sensor is connected in series United peak detector, circuit analysis, control circuit power supply point light source, the second input of which is connected to a separate output of the circuit analysis, power supply, a point light source, optically coupled through the collimator, and the measured product with the image sensor, also, the output signal "reset" of the image sensor connected to the control input of the control circuit power supply point light, and the output of the third phase of the image sensor is connected to the second control input of the peak detector and the input of the second measurement impulse shaper connected to the output video signal of the image sensor, and the output to the first input circuit OR the second input connected to the output of the first driver of the measuring pulse and the control input of the first key signal input which, combined with the counting input of the second frequency divider, the connection is smertelnogo pulse, and its output connected to the control input of the second key signal input which is connected to the output of the second frequency divider, with the combined outputs of the first and second keys is connected to the counting input of the counter.

The proposed device, the accuracy improvement is achieved by introducing a chain of automatic control of the radiation intensity of a point light source, consisting of a series of peak detector circuit analysis and control circuits power supply of a point source of light, as well as correction of the measurement device, taking into account the dynamics of the controlled products containing the schema selection front, rear and fronts the main part of the measuring pulse and the circuit controlling the number of pulses fill the named parts of the measuring pulse, consisting of the first and second shapers, schemes OR additional frequency divider and the first and second keys. Thus, introduced the characteristics of the peak detector circuit analysis and control circuit power supply of Estonica light, and also the scheme of allocation front, rear and fronts the main part of the measuring pulse and the circuit controlling the number of them is the result of the measurement and to expand the capabilities of the device compared to the prototype.

Comparative analysis of the prototype and the proposed technical solutions allow to conclude that the proposed solution meets the criterion of "novelty."

In known devices, solving the problem of measuring the diameter of the product, there are no signs, namely the peak detector circuit analysis and circuit for controlling the light source, as well as the allocation of front, rear and fronts the main part of the measuring pulse and the control circuit pulses filling, there is no such organization relationships that enhance the measurement accuracy and the empowerment of the proposed device. The presence of the distinctive characteristic of the unknown in the technical solutions, allows to make a conclusion about conformity of the proposed solutions to the criterion of "significant differences".

In Fig.1 shows a functional diagram of the device of Fig.2 is a block diagram of the image sensor, is made on the basis of the CCD of Fig. 3 is an electric circuit automatically controlling the brightness of the light source, and Fig. 4 shows the implementation of signals illustrating the operation of the circuit to automatically adjust the brightness of the light source, and Fig.5 is an electrical diagram of the correction of the dynamics of the controlled product.

From the functional to the flowchart shown in Fig. 1, it follows that the point light source 1 is located in the focal plane of the collimator 2 to its optical axis; measured product 3 is located in the collimated beam of light perpendicular to a one-dimensional line image sensor (DI) 4, videosignals output connected to the input of the first driver measuring pulse 5, and a clock output connected to the counting input of the first frequency divider 6, and its output "reset" is connected to the first control input of the peak detector 14, to the control input of the control circuit power supply point light source 16 and to the counting input of the counter implementations 7, one output of which is connected to the fault input cascaded counter 8 and the pulse counter filling 9 and its second output connected to the input of the entry register 10, which is connected with its informational inputs to the respective outputs of the pulse counter filling, and information outputs to the cascaded decoder 11 and the indicator 12; in addition to videosignals output DI 4 is connected to the input of the second shaper measuring pulse 13 and consistently included a peak detector is the 1, thus the output of the third phase DI 4 is connected to the second control input of the peak detector; the output of the first measurement impulse shaper 5 is connected to the first input circuit OR 18, and the output of the second shaper 13 is connected to the control input of the first key 19 and the second input circuit 18, the output of which is connected to the control input of the second key 21, and the output of the first frequency divider 6 is connected to the signal input of the first key 19 and the counting input of the second frequency divider 20, the output of which is connected to the signal input of the second key 21, moreover, the combined outputs of the first and second keys is connected to the counting input of the counter 8.

The image sensor (DI) 4, a functional diagram of which is shown in Fig.2, comprises a generator of clock pulses (GTI) 22, and outputs connected to the inputs of the unit generating control voltages (BFUN) 23, the outputs of which are connected to corresponding inputs of the level Converter (PU) 24, is connected by its outputs to the corresponding inputs of the CCD 25, videosignals the output of which is connected to the input of amplifier 26, the output of which is used for the purpose.

The device operates as follows.

Tochechnyi beam of light from the respective source radiation pattern, which is converted by the collimator 2 in a collimated beam illuminating the measured product 3, the shadow of which is converted DI 4 into a video signal received at the input of peak detector 14, and the first and second shapers measuring pulse 5 and 13 having different thresholds. The first driver 5 has a threshold Un1slightly exceeding the noise level at the output of the amplifier, and the second 13 threshold Un2slightly less than the permissible value of the signal amplifier in a state close to saturation (Fig.4A).

Due to the dependence on temperature characteristics of the analog elements of the device (the CCD line, amplifier and a point source of light), as well as their dependence on unstable power supply in the proposed device introduced the scheme of automatic control (AR) radiation of a point source of light containing a peak detector 14, the analysis scheme 15, the control circuit power supply point light source 16, the power supply 17 and the light source 1.

Video output DI 4 corresponding to the "shadow" of the measured product 3, negative polarity (Fig.3A) is a sequence of pulses of different amplitude (VideoSuite detector must allocate a minimum value of the envelope. In the initial state capacity peak detector signal "reset" on the first control input is charged to the maximum value, i.e., until the voltage level of the power source. Due to the fact that the video cut pulses of one phase, a peak detector 14 will always come out at the Foundation level of the signal, i.e. at the zero level. To avoid this, a peak detector on the information input is opened by pulses phase according to the second control input on the transit time of the pulse signal, and the pulse time with DI 4 reset the peak detector 14 for information admission to the appropriate level.

The voltage level, the selected peak detector 14, is fed to the input circuit analysis 15, which compares it with a given threshold (Fig.3) and generates on its output levels corresponding to the comparison result. This condition arrives at the inputs of the control circuit power supply point source of light (OPTIS) 16 includes a leading edge signal "reset" in the register and in the form of a control signal supplied to the control input of the power supply 17, the voltage change at the input which leads to a change in the brightness of the radiation of a point source that obvodit the amplitude of the video signal in the capture zone, asked thresholds of the comparison circuit (Fig.3).

In steady state schemes AR formers 5 and 13 form the pulses of different widths (Fig.4.2,3). The pulse shaper 13 positive polarity corresponding to the flat part of the video signal is supplied to one input circuit 18 and the control input circuit of the key 19, which opens and sends the output pulses of the first frequency divider. The wider the pulse from the output of the imaging unit 5 (Fig.4.2) is supplied to the second input circuit 18, the output of which pulses of positive polarity, duration and position corresponding to the front and rear edges of the video impulse. These pulses are received at the control input circuit of the second key 21 and open it. The output of the key 21 are the pulses of the second frequency divider 20. A bundle of impulses, corresponding to the "shadow" of the measured product 3, with the combined outputs of the first and second keys 19 and 21 is fed to the input of counter 6 and then after corresponding transformations in a series circuit, the counter 9, the register 10 and the decoder 11, the received information is displayed on the display 12.

In Fig.3 shows the electrical scheme of automatic brightness control point istinnogo on the diode VD1, restrictive and breathalyser the resistor R2 and the integrating capacitance C1. Control peak detector is provided with keys 27.1 and 27.2, on the basis chip CT. The output of peak detector connected to the input circuit analysis 15, performed on two Comparators (28.1 and 28.2) - based chip AD and a diode circuit And the diodes VD2, VD3 and the resistor R6.

C output circuit analysis, appropriate signals are sent to the inputs of the control circuit power supply point light source 16 that contains the trigger of the "sign" 29.1 and trigger the generation of the control signal 29.2 (chip TM). The signal from the trigger output of the "sign" is supplied to the information input key 27.3. The output of the comparator 28.1 connected to the information input trigger "sign" 29.1, and the output of the diode circuit And to the information input trigger control 29.2. The trigger output of the "sign" is connected to the information input key 27.3, and the output trigger control to its control input, the output of the key 27.3 connected to the input of the integrating chain R9 C3, the output of which is connected to the buffer circuit, which is made on the chip AD. The output of block 16 is used for the purpose.

The described scheme of automatic control operates as follows. At the beginning of each implementation with the supply of the power circuit (9V). The video signal from the output of the amplifier 26 DI 4 is fed to the input key 27.1 peak detector, which is controlled by pulses of the third phase, and the output it generated instantaneous values of the peaks of the pulses constituting the signal, which are stored peak detector. When the negative differential signal generated by the "shadow" of the measured product 3, the peak value of the pulses constituting the signal decreases; however, the capacity C1 of the peak detector is discharged through the diode VD1 to a minimum level of the video signal (Fig.4.2, 4.3). The signal peak detector 14 is fed to the input circuit analysis 15, then on the combined inputs of two Comparators with different thresholds Un1for comparator 28.2 and Un2for comparator 28.1. These threshold voltage fork set of valid values of the negative level of the signal. The response of the Comparators 28.1 and 28.2 shown in the plots of Fig.4.4 and 4.5. The state of the Comparators 28.1 fed to the input of D-flip-flop "mark" scheme 16 and at the same time the diode circuit And, afterwards on trigger control. Reaction triggers 29.1 and 29.2 shown in Fig. 4.6 and 4.8. Key 27.3, controlled by the trigger 29.2, charges or discharges the capacitance C3 depending on the sign at the output of the trigger 29.1, the result is the control voltage fed to the control input of the power supply 17, providing a current change in the circuit of the light guide, and thus its brightness.

In Fig.4 shows the implementation of signals illustrating the operation of the circuit auto-dimming point light source. Here the numbers indicate: 1 signal phase DI 4; 2, the video signal corresponding to the "shadow" of the product 3; 3 signal at the output of peak detector 14; 4 signals at the output of the comparator 28.1; 5 signals at the output of the comparator 28.2; 6 signals at the output diode Assembly VD2 and VD3; 7 the output signal "sign" trigger 29.1; 8 the control signal trigger 29.2 key 26.3; 9 control voltage at the output of block 16; 10 signals "reset" output DI 4.

In Fig. 5 shows the electrical circuit is correct dynamics of the controlled products containing the allocation of front, rear and fronts flat part of the measuring pulse and the circuit that controls the number of pulses of these parts. These diagrams explain the plot of the signals in Fig.6.

The correction pattern of the dynamics of the controlled products containing blocks 5, 13, 18, 19, 20 and 21, is implemented as follows. Shapers measuring pulse 13 and 5 is performed on the chip UD (31.1 and 31.2), scheme OR 18 on the chip LE (33), the frequency divider 20 on the chip TM (32) and the clew is) is moving in the field of view of the CCD-line product. Flat fronts it due to the fluctuation of cable, wire and other products in their manufacture. This phenomenon occurs when the condition of commensurability displacement measured products with the accumulation time of the CCD-line (photodiode line). This tilts front and back edge, i.e., the duration the same, because the velocity of the same body, a sloping part of the video (its top) is reduced by the duration of the leading edge, and at the same time, the total duration of the video signal is increased by the duration of the trailing edge. The proposed compensation scheme, the dynamics of the measured product takes into account this phenomenon. Described video signal is supplied to the combined inputs of Comparators 31.1 and 31.2, having posted the threshold voltage Un2and Un1(Fig.6.1). The response of the Comparators shown in Fig. 6.2 and 6.3. Scheme OR 33 provides the selection of the fronts of the video signal and the signal (Fig.6.4) with its output fed to the control input of key 34.2, ensuring the passage of the pulses after frequency divider 32 (Fig.6.6). The signal comparator 31.2 corresponding to the flat part of the video signal is supplied to the control input of key 34.1, ensuring the passage of pulses from the output of the frequency divider 6 (Fig.6.5). Takemiya pologovoy part of the video signal corresponds to a previously selected [1] value, and while the front and rear fronts this frequency is divided in half. Then the total number of pulses filling (pack)

< / BR>
where tpthe pulse duration corresponding to the flat part of the pulse of mobile products; tPFpulse leading edge mobile products and tPDhis rear front; f pulse frequency; tf- the length of the front. Moreover, this ratio does not depend on the oscillation frequency of the measured products (up until the point when the accumulation time is equal to the period of oscillation of the measured product) in a wide range of vibration frequencies of the measured product. You may notice that this range is wider than for products with a large diameter.

In Fig. 6 shows the implementation of signals explaining the operation of the correction patterns of the dynamics of the controlled object. Here are marked by numbers:

1, the signals at the inputs of Comparators 31.1 and 31.2;

2, the signal at the output of the comparator 31.1;

3, the signal at the output of the comparator 31.2;

4, the control signal key 34.2 generated by the scheme OR 33;

5, the signal at the input of the frequency divider 32;

6, the signal at the output of the frequency divider 32;

7 the resultant signal pulse packet at the common output keys 34.1 and 34.2.

During the operation and study of a prototype of the device was noted the change with time of the measured values of the diameter of the product. The analysis of these measurements showed that the amplitude of the signal, and hence the steepness of the fronts of the output DI 4 is connected with the temperature dependence of analog elements, as well as instability of the power supplies for the analog elements. The value of the amplitude of the signal voltage Ucoutlet DI 4 can be expressed by the following equation:

Uc(t)=Kf[Ul, Ky(t), Up(t), ISt(t)]

where Ulthe output signal of the photodetector; Ky(t) the gain of the amplifier signal line DI 4; Up(t) the voltage of the power source and ISt(t) the luminosity of the led. The maximum dependence Uwithis evident from the ISt(t), so if the scheme of automatic control to build on the basis of the stabilization of the amplitude Uwithby controlling the luminance of the led, can largely eliminate the influence of the temperature dependence of the parameters of the analog components of the device. The accuracy of the device will be determined only by the resolution (resolution) of the photodetector and nelena verification of known and proposed device showed the absolute measurement error of the device in the 5oC10 times less in comparison with the known.

The efficiency of the correction patterns of the dynamics of the controlled products adequately shown in the description section of her work.

Photoelectric device for measuring the diameter of the rolling product containing the image sensor and is connected to the output signal of the Reset image sensor connected in series count implementations, additional counter, pulse counter filling, a second input connection from the input of the counter, a register, a second input connected to the second output count of the number of implementations, decoder and display, as well as the first driver of the measuring pulse input connected to the output video signal of the image sensor, and the first frequency divider, the input connected to the third output of the image sensor, characterized in that it additionally introduced the second shaper measuring pulse, a peak detector, circuit analysis, control circuit power supply, power supply, a point light source, the scheme OR the second frequency divider, the first and the second key, and to output signals is possible by the power of a point source of light, the second input of which is connected to a separate output of the circuit analysis, power supply, a point light source, optically coupled through the collimator and the measured product with the image sensor, and the output signal "Reset" of the image sensor is connected to the first control input of the peak detector and the control input of the control circuit power supply point light source, and the output of the third phase of the image sensor is connected to the second control input of the peak detector and the input of the second measurement impulse shaper connected to the output video signal of the image sensor, and the output to the second input of the circuit OR connected to the first input to the output of the first driver of the measuring pulse and to the control input of the first key signal input which is combined with a counting input of the second frequency divider connected to the output of the first frequency divider and the output of the circuit OR connected to the control input of the second key signal input which is connected to the output of the second frequency divider, with the combined outputs of the first and second keys is connected to the counting input of the counter.

 

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