SU1694467A1 - Equipment process parameter monitoring system for production of reel materials - Google Patents

Abstract

The invention relates to means of controlling the parameters of the technological process in the production of rolled materials such as artificial leather and film materials, namely the speed of their movement during the production process. The aim of the invention is to expand the technological capabilities of the system. The system contains sensors, a situation switch, an operation mode switch, a material speed computing unit, a situation indication unit, a situation determination unit, a match comparison unit, a reference speed unit. The system makes it possible to simulate various situations of equipment malfunction, in the learning mode, to memorize, identify them, reveal and indicate equipment malfunctions in the course of operation. 1 silt

Description

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The invention relates to controlling parameters of technological processes for the production of rolled materials such as artificial leather (IR), film materials (PM) and can be used in light industry.

A device for measuring the speed of movement of an object is known, which contains 2 located one to the other in the direction of movement of the material of the measuring sensors. The sensors produce the corresponding physical structure of the object and nondeterministic signals that are shifted one relative to the other by the travel time T. The signal produced by the first sensor, for the purpose of correcting it, is applied to the signal processing unit switched on after the first sensor. In the processing unit, the specified signal using a delay link

automatically delayed by simulated travel time g, inversely proportional to the speed of the object. The signal is delayed until the average deviation of both signals reaches a maximum.

This device, like any one that uses a correlation method of processing information, has the following disadvantages, making it unsuitable for controlling the movement of artificial skin (IR) materials and film materials (PM) at equipment operating at a speed of up to 100 m / min. high stationary requirements for input signals; high demands on the width and position of the frequency band of their spectra

Since under these technological processes the frequency of the spectra lies in

ABOUT

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a few hertz, to obtain information about the material speed, the low frequency process must be done within a few minutes. This is unacceptable from the point of view of the accuracy and dynamic characteristics of the device.

A device is known for measuring the speed of movement of the solid phase of the pulp of a dredging plant, in which I use a discrete-continuous probabilistic method (DNB method) of information processing. The device allows to determine the speed of movement of the solid phase of the pulp, deposited on the local volumes of the pulp of the mark (remember the physical state of the local volume) with further recognition of the mark on a fixed (base) distance. The device has a unit for determining the dominant frequency of the spectrum of the process, which allows to increase the noise immunity. A device using the DNV method has high dynamic characteristics (it allows tens of measurements of speed per second), which makes this method of measurement preferable for creating a system.

However, the use of this device for measuring the motion parameters of rolled materials such as IR and PM does not allow obtaining a sufficiently complete picture of the technological process and the state of the process equipment, since the device does not contain elements that allow obtaining information about the dynamic characteristics of the technological process, does not contain means of controlling production material and diagnostics of the state of technological equipment, which does not allow to optimize the production process,

The proposed system for monitoring the motion parameters of the coiled material, in addition to measuring the speed of the material, contains means for determining and indicating the length of the material, elements for determining the dynamic characteristics of the process and, in addition, a unit for determining the state of the process equipment by isolating the dominant frequency of the actual situation and comparing it with reference, corresponding to the specific condition of the equipment.

The purpose of the invention is the expansion of the technological capabilities of the system.

This goal is achieved by the fact that the monitoring system of technological parameters of equipment for the production of web material, containing two measuring sensors located on

one line at a fixed distance from each other along the direction of movement of the material, connected to a two-channel switch, the output of which is connected

with the input of the measuring converter, the output of which is connected to the input of the controlled narrow-band filter, the output connected to the input of the differentiation element, the output of which provides keys to the first inputs of a two-channel comparison element and a two-channel element, respectively, of the second and third inputs compared to 5, the outputs of which are connected to the inputs of the match element, the output connected to the input of the time counter and the control node, the output of the last connection n to a second input of the two-channel element na0 m ti, fourth two-channel input comparator element, two-channel input and the second input switch vre- counter. change, and the output of the controlled narrow-band filter is connected respectively

5 with a fifth input of a two-channel comparison element and a third input of a two-channel memory element, and a second input of a controlled narrow-band filter is connected to the output of a filter control unit,

0 whose inputs are associated respectively with the outputs of the control unit and the dominant frequency determination unit whose inputs are connected with the outputs of the multichannel spectrum analyzer-correlator,

5 is connected with the output of the measuring converter, additionally equipped with a situation indication unit, a matching-coincidence unit, a situation recording unit and a reference speed unit, with

0 this situation indication block includes — a differentiation element, an integration element, speed, acceleration and length indicators, and a situation indicator, the output of the time counter associated with

5 inputs of the differentiation element; the integration element and the speed indicator, the output of the differentiation element is connected with the input of the acceleration indicator, the output of the integration element

0 is connected to the input of the indicator-length, the comparison-matching unit consists of situations comparison circuits, the situation recording unit includes a two-input element OR with inversion at the input, connected with direct and inverse inputs with the output of the differentiation element, the AND element whose first input associated with the output of the two-input element OR, and the second with the source of a constant unit level, as well as speed comparison circuits and situation memory elements, the number of speed comparison circuits being equal to the number of outputs of the reference speed block and each One of the latter is connected to its input of the speed comparison circuit, the second input of each of which is connected to the output of the time counter, and the output of each is connected to the inputs of at least two situation memory elements, each of which is connected to the first input situation comparison circuits, forming the information processing channel, the second inputs of each of the memory elements of the situation are connected to the output of the AND element, in addition, the system is equipped with a mode switch and a situation switch, the first contact of which is connected to the third The contact of the operating mode switch, the first contact associated with the output of the dominant frequency determining unit, and the rest of the situation switch contacts, the number of which is equal to the number of speed comparison circuits, are associated with the corresponding (for each memory element of the situation of all information processing channels) the second inputs of each comparison circuit is connected with the second contact of the operating mode switch, and the outputs of the respective comparison circuits of the situations of each information processing channel are combined with They are connected with the inputs of the corresponding situation indicators of the situation indication unit, and the number of situation indicators is equal to the number of situation memory elements connected to one speed comparison circuit.

The drawing shows a functional diagram of a system controlling the motion parameters of the web material.

The system contains two sensors 1 and 2 (for example, high-frequency capacitive pass-through type) located at a fixed distance DB from one another along the direction of movement of the material 3. The sensors are connected to a two-channel switch 4, the output of which is connected to the input of the measuring converter 5 (for example, high-frequency dielcomometric). The output of the measuring transducer 5 is connected to the input of a multichannel spectrum analyzer-correlator (spectrum) 6, the outputs of which are connected to the inputs of the dominant frequency determining unit 7 with an analysis time unit (ta), whose output is connected to the input of the control unit filter 8, the output of which is connected with the control input of the controlled narrow band filter 9, the input is connected to the input of block 6, and the output is connected to the input of the element

differentiation of 10 computational unit (B B) 11.

WB 11 also has two-channel comparison elements 12 and memory 13. The outputs 5 of element 12 are connected by a matching element 14, the output of which is connected to the inputs of the time counter 15 and the control unit 16, the output of which is connected to the control inputs of the switch 4 and the control unit 10 by filter 8 and also to the inputs of the memory elements 13, the comparison 12 and the second input of the counter 15 of time.

The inputs of the first channels of elements 12 and 13 are interconnected, forming the input 5 of WB 11, to which the input of element 10 is connected. The output of element 10 is connected to the input of the second channel of memory element 13 and the first input of comparison element 12 similar to the channel. The second inputs of the channel element 0 12 comparisons are associated with the outputs of similar channels of the memory element 13. The output of the time counter 15 is the output of the EB 11, the time counter 15 is connected to the differentiation element 17 (for example, a differentiating chain), thread integration element 18 (integrating chain) and the speed indicator 19 for its output. Elements 17 and 18 are associated with 0 acceleration indicators 20 and length 21, respectively. Pointer gauges can be used as indicators.

Elements 17-21 are part of a situation indication unit 22, in which also 5 situation indicators 23 are included. The latter highlight situations corresponding to a certain state of the process equipment, for example, Calender roll skew, calender roll beats, etc. 0System also contains block 24 records

situations, match comparison block 25 and reference speed block 26.

Block 24 of the situation record includes a two- 5 input element OR 27 with inversion on the input. In this case, the inverting input reacts not to a zero signal, but to a negative one. The inputs of the latter are connected with the output of the differentiation element 17, 0 and the output with the And 28 element, also included in block 24, which includes, in addition, speed comparison circuits 29, the number of which is equal to the number of outputs of the reference velocity block and whose inputs are These are the 5 outputs, as well as elements of the situation memory 30, grouped together. In this case, each group, the number of elements in which is determined by the possible state of the technological equipment, is connected by the inputs of its elements 30 to the output of one speed comparison circuit 29. The other input of each element 30 is connected to the output of element I 28, to the second input of which the level corresponding to one is fed. The second input of all speed comparison circuits 29 is connected to the output of time counter 15.

The system also includes a mode selector switch 31, which is, for example, a toggle switch for two positions — Situation Recognition Mode and System Learning Mode, as well as a Situation Switch 32 associated with the first contact with the switch contact 31 of the System Learning Mode, and the rest contacts, the number of which is equal to the number of possible situations of equipment condition (Calender rolls skew, calender rolls, etc.)} with each of the groups of situation memory elements 30. The outputs of the latter are connected to the inputs of the corresponding - circuit 33 of comparison of situations, the number of which is equal to the number of elements of the situation memory 30. In this case, all elements 30 and 33 connected to one speed comparison circuit 29 form an information processing channel.The second inputs of all situations comparison circuits 33 are connected from the contact The situation detection mode of the operation mode switch 31, the first contact of which is given a signal from the output of the dominant frequency determining unit 7.

The outputs of each first situation comparison circuits 33 of each information processing channel are combined and connected to the input of the corresponding situation indicator 23, the same with respect to the second, and so on. schemes 33 comparison situations.

This part of the system can be executed on a microprocessor basis, using, for example, an electronics controller of type M02702,

The idea of the system is that each technological process of production, in this case, rolled materials, has a strictly fixed dominant frequency, depending on the speed of movement of the material, its physical properties, and the state of the technological equipment.

It was found that for each equipment speed mode its spectral portrait can be recorded. At the same time, instabilities in the operation of the equipment, caused by the violation of its modes of operation (Calender roll misalignment, Calender roll beats, etc.) sharply raise the dominant frequency, which, for the indicated

processes in stable mode are in the order of 3-7 Hz.

The system works as follows. When serving at discrete time

the time signal from the control unit 16, the switch 4 connects the sensor 1 to the measuring transducer 5. At the same time, the memory element 13 is turned on, and the comparison element 12 is turned off. In this case, a signal proportional to the current value of the dielectric constant of material 3 (VKA), detected by sensor 1, is fed to the input of block 6. With the passage of this signal through

5 controlled narrow-band filter 9, the component VKA (fy) is extracted from it with the dominant frequency td of its spectrum, which is fed to the computing unit 11 to determine the speed of the material

0 3. In block 11, a set of recognition features of local-localization in a two-channel memory element 13 occurs. total volume of the material (its label): the instantaneous value and sign of the derivative

5, the process of changing it, determined by element 10, is simultaneously turned on by a time counter 15. After the end of the process, on command from node 16, switch 4 connects to the measuring

0 to transducer 5 sensor 2. Simultaneously

element 12 of the comparison is included therewith.

Now the input of block 6 receives a signal

“UKB, and the input unit 11 V« B (fy). Via

Comparison element 12 is a continuous comparison of the set of recognition features memorized by sensor 1 of the local volume of material 3 memorized by element 13 with its current values determined by transducer 5 and filter 9, as well as differentiation element 10.

With the passage of the labeled local volume of material 3 through the sensor 2 on

5, element 12 coincides with a broken aggregate of its recognition features, which is fixed with the help of element 14 of coincidence. The signal from the output of the last counter 15 stops.

0 and the control node brings the circuit to the initial state, preparing it for the next VT measurement cycle. Determine the time taken by the labeled local material 3 to pass the measuring

5 DB sections, calculate the speed Vr, in the values of which the output of block 11 is graduated. If, due to the possible distortion of the recognition signs, the labeled local volume of the material fails to detect it, then after

the set reset time t is given a command from node 16 to reset the memory (element 13) and time (counter 15).

After this, the circuit is reset and a new measurement cycle VT is started. At the same time, the output of the counter 15 stores (stores) the value of VT calculated in the previous measurement cycle. The speed measurement cycle repeats periodically, and the repetition rate of the cycles (their number) automatically changes depending on the magnitude VT. This is ensured by the presence of a functional link from the output of the element 14 to the input of the control unit 16. At the same time, the ratio of the number of measurements per second and the value of VT is maintained almost unchanged, which leads to a constant measurement error in the entire range of its change.

The determination and extraction of the dominant frequency of the spectrum of the monitored process of varying the consistency of the pulp is carried out in blocks 6-9 as follows.

The VK (A, B) signal is fed to the input of the multichannel spectralizer-correlator (spectrum) 6, which provides continuous qualitative analysis of the spectrum of the process of change in time of the consistency of Qu pulp, for example, in the frequency range up to 25 Hz. At the same time, at its outputs, the power of a random signal Uk (A.B) Bj (1, ..., p) is determined, its frequency band

Spectrum, G2 Gn. Block 7determination

the dominant frequency td analyzes the information received at its inputs from the spectrum analyzer 6 during the analysis time ta set by the setpoint V (ta). At the end of time ta, the value of the signal at the output of block 8, proportional to the value td of the spectrum of the analyzed process V "(t), is refined, and a new analysis cycle begins, after which the output signal to the filter control unit, and m .d

Block 8 generates a Vynp command to rebuild narrowband filter 9. Moreover, changing this command, and therefore rebuilding the filter, is allowed only during the preparation time (tn) of memory element 13 to store information. The indicated filter tuning time 9 is determined by the command V (tn), which is fed to the control input of the unit 8 from the node 16 of the controller. Such synchronization of the operation of the computational element 11 and the moments of filter adjustment 9 eliminates the possibility of artificially distorting the information supplied through it to the block 11 of calculating VT. At the command of Vynp, the filter 9 is tuned to one of its discrete bands (up to 25 Hz), thereby providing the selection of the VK (A, 5) (fy) component of the signal A- (A, B) with the dominant frequency of its spectrum, which is currently defined by the device. In this case, the high accuracy of determining the dominant frequency td is ensured by using in the device not just a spectrum analyzer, but a spectrum (spectrum analyzer-correlator) that implements high-quality spectral analysis of the random signal under study.

The current speed value is indicated on the speed indicator 19, and, being differentiated by the differentiation element 17, makes it possible to judge the acceleration of the movement of the material. This is indicated on the acceleration indicator 20 and the integrated integration element T8 provides information on the length of the material, which is indicated by the length indicator 21.

To diagnose the condition of the equipment, the following operations must be performed.

The mode switch 31 is set to the position of the System Training mode, the situation switch 32 is set to the first position, which corresponds to the nastable equipment operation mode being simulated at a given time, for example, Transfer of calender rolls. In this case, the dominant frequency determining unit 7 allocates the dominant frequency td corresponding to this mode, and at its output there appears a voltage corresponding to this frequency VfA for the current velocity of the material.

The equipment operates at a constant increase in current speed. In this case, suppose that in the first speed comparison circuit 29, the current and reference speed values, received from the output of the reference speed block 26, coincide (all speed values are represented as voltage). If the current and reference speeds coincide, the permission is given to write to the first memory element 30 the situation of the first information processing channel value / rd corresponding to the dominant process frequency at the given speed. The speed is then increased by a certain amount, corresponding to the requirements of the technological process, and it coincides with the second reference speed from the output of the reference speed block 26 in the second speed comparison circuit 29. This is how the first situation is recorded (Transfer of calender rolls) to all the first elements of memory 30 of the situation of all information processing channels.

Then the situation switch 32 is moved to the second position. The following state of the process equipment is simulated, for example, beating calender rolls. The voltage corresponding to the dominant frequencies of this situation for all speeds is recorded in the second situation memory 30 elements of all the information processing channels. By simulating various situations inherent in this technological process, information is recorded for all speeds into all elements of the situation memory 30 of all information processing channels. Then the operation mode switch 31 is set to the situation recognition mode. Information on the dominant frequency of the process, which is already actually occurring with the operating equipment, goes to all the first inputs of the situation comparison circuits 33. At the same time, by automatically comparing the current value of speed and reference values from the block 26 of reference speeds, a specific information processing channel is selected corresponding to this speed value. However, as long as the process is stationary, i.e. The acceleration of material 3 is zero, the situations are stable and the equipment is operating normally.

If any instability occurs in the operation of the equipment, the output of differentiation element 17 produces a positive or negative polarity signal, which, having passed the two-input element OR 27, which serves to invert the negative signal, and element 28, which serves to calibrate the signal (i.e. ensuring the passage of a signal only if it corresponds to its required level), is fed to the inputs of all elements of the situation memory 30. In this case, the selection of the information processing channel that corresponds to the current speed. The signals from the output of all elements 30 of the memory situation of this channel are sent to the corresponding situation comparison circuits 33, however, the comparison only takes place with the situation recorded in one of the situation memory elements 30, which corresponds to the current value of its dominant frequency coming from the output of the detection unit dominant frequency

The identified situation is highlighted on the corresponding situation indicator 23 (e.g., calender rolls beating) and can also be output to the actuators controlling the operation of the equipment.

Thus, the system produces a constant calculation of the current value of the speed of movement of the material, the acceleration

0 its movement, the length of the past material and, in addition, allows to judge the instability in the equipment, i.e. optimize his work. This leads to improved product quality, longer equipment life, more accurate accounting of finished products.

Claims (1)

Claims Invention System Technological Parameters Control System for Production 0 roll material containing two measuring sensors located on the same line at a fixed distance from each other along the direction of movement of the material connected 5 outputs respectively to the first and second information inputs of a two-channel switch, the control input of which is connected to the control output of the computing unit and to the control input of the filter control unit, and the output through the measuring converter to the information input of the narrow-band filter and the multi-channel information input Spectrum analysis of a pa-correlator connected by outputs to the corresponding inputs of a dominant frequency determination unit, the output of which is connected to information input b The filter control, connected by an output to the control input of a narrow-band filter whose output is connected to the input of a computing unit, is characterized in that, in order to expand the technological capabilities of the system pulling the equipment condition diagnostics, the comparison display unit is inserted into ftero coincidence, situation determination unit, reference speed unit, mode switch, situation switch, indication and measurement unit for measuring speed, acceleration and material length, the output of the block being determined and the dominant frequency is connected to the input of the mode switch, 5 the first output of which is connected to the information input of the comparison-matching unit, the outputs of which are connected respectively to the inputs of the situation indication unit, and the information inputs of the situation simulation - respectively to the outputs the situation determination unit, the inputs of the reference signals of which are connected respectively to the outputs of the reference speed unit, and the situations control inputs to the corresponding outputs of the situation switch, whose input is connected to the second output p mode switch , at ep Thereby, the output of the material speed of the computing unit is connected to the input of the display unit and measuring the speed, acceleration and length of the material, the acceleration output of which is connected to the input of determining the unstable operation of the equipment of the situation determining unit. On management equipment operation