SU1667016A1 - Cores diameter gauging up on paper twining machines - Google Patents

Abstract

The invention relates to automation and can be applied in cable technology in the manufacture of cores with paper-weight insulation. The aim of the invention is to improve the accuracy and speed of the system. The goal is achieved due to the fact that a drying model is introduced into a known system containing a driver unit, an insulation speed control unit, a pulp concentration control unit, a block for selecting optimal insulation speed and mass concentration, a functional converter, a sensor for the number of insulated cores. the furnace, the delay compensation unit, the unit for setting the average diameter of the cores after drying. 1 hp f-ly, 10 ill.

Description

WITH

WITH

The invention relates to automation and can be applied in cable technology in the manufacture of cores with paper-weight insulation.

The purpose of the invention is to improve the accuracy and speed of the system by using the method of compensating for the effect of time lag when constructing its structure.

FIG. 1 shows a block diagram of the system; in fig. 2 is a block diagram of a lag compensation compensation unit; FIG. 3 is a block diagram of the regulation of the rate of isolation; in fig. 4 is a block diagram of a pulp concentration control unit; Fig. 5 is a block diagram of the control object; in fig. 6 is a block diagram of the blocks for selecting the optimum concentration of pulp and paper pulp; in fig. 7 is a block diagram of a functional converter; in fig. 8 is a block diagram of a sensor for the number of insulated cores. in fig. 9 is a block diagram of a driver unit; Fig 10 is a block diagram of a link with variable delay.

The system contains a lag compensation compensation unit 1, an insulation speed control unit 2, a pulp concentration control unit 3, a control object 4, an optimal insulation rate selection block 5, an optimum pulp concentration selection unit 6, a functional converter 7 , sensor 8 of the number of insulated cores, model 9 of the drying furnace, driver unit 10, sensor 11 of the average diameter of the cores after drying, unit 12 of the setting of the average diameter of the cores.

The lag effect compensation unit 1 is designed to generate a signal that is supplied through blocks 5 and 6 to blocks 2 and 3 for controlling the rate of isolation and the concentration of pulp and paper.

xj o

bulk weight in order to adjust the average diameter of the insulation of the wires. Block 1 contains the first 13 and second 14 adders and link 15 with variable delay. Insulation speed control unit 2 is designed to pull the sixty cores insulated in control object 4 at the required speed and stabilize this speed at a given level. This unit contains a contactor 16, a speed regulator 17, a current regulator 18, a voltage converter 19, an electric motor 20, a driving device 21, a current sensor 22, a speed sensor 23, a motorized potentiometer 24, a reference voltage source 25. The pulp concentration control unit 3 is designed to supply the mass of the required concentration to the control object 4 and stabilize this concentration at a predetermined level. This unit contains a concentration controller 26, a flow controller 27, a relay electric actuator 28, a multi-turn valve 29 with a pipeline, a mass composition mixer 30, a pressure pool 31, a pulp and paper pulp sensor 32, a pulp concentration sensor 33, not shown), motorized selsyn 34, contactor 35 and motorized potentiometer 36.

The adjustment object 4 comprises a mesh drum 37, a press 38, an ironing device 39, a drying oven 40. A mesh drum serves to deposit the mass on the copper cores. The press is designed for pressing paper pulp on the cores and at the same time is a pulling device in the area from the delivery devices. At the exit of the press, narrow strips of paper pulp are formed on the conductors. In the ironing unit, the paper strip is rolled up into a cylindrical shape. In a drying oven, chemically unbound water is removed from the pulp and paper insulation.

The block 5 for selecting the optimal isolation rate and block 6 for selecting the optimal value for the concentration of pulp and paper pulp are used to control blocks 2 and 3, taking into account the nonlinearity of the following expression

Dn- - / in GHA + d2i

Y n Vi ° (

where Dn is the predicted diameter of the insulated conductors before entering them in the drying oven;

AT

A - coefficient proportional to 0

five

four

I

onality;

A is the coefficient taking into account the real conditions of the formation of the insulation of the veins;

K is the pulp concentration;

n is the number of simultaneously isolated veins;

Vi is the rate of isolation;

d is the diameter of copper wires before insulating;

Q is the mass flow rate.

The control algorithm (1) is obtained from the dry fiber balance equation per unit time.

nSiVi AKQ, (2)

4 2 where S - jf (D p - d2) isolation section

0

five

0

five

0

five

0

five

veins;

 - volumetric mass flow;

S2 is the cross section of the pipeline through which the mass is fed into the mesh drum;

/ 2 - the speed of movement of the mass through the pipeline.

Each of blocks 5 and 6 contains an electrically isolated node 41, an analog-to-digital converter 42, a comparator 43, a counter 44, a digital-to-analog converter 45, and a memory element 46.

Based on the control algorithm (1), a functional converter 7 operates, which contains the first, second and third multipliers 47, 48 and 49, respectively, divider 50, adder 51, square extraction element 52. Sensor 8 of the number of insulated conductors is designed to determine the number of currently insulated conductors, It contains n sensitive elements 53-112 by the number of conductors (maximum), n - transistor switches with reed relays 113-172 and voltage adder 173.

Link 15 contains the first and second integrators 174 and 175, respectively, a controlled amplifier 176, an inverter 177, and a control circuit, which consists of a third integrator 178, an adder 179, and a setpoint isolation speed regulator 180.

Model 9 of the drying oven is designed to generate a signal that predicts the average diameter of the insulation of the cores at the outlet of the drying oven. This model takes into account the change in the diameter of the insulation after drying and is a unit of multiplying by a constant coefficient.

The driver unit 10 provides the output values of the boundary parameters for the rate of isolation and the concentration of pulp and paper pulp, the diameter

uninsulated veins and real conditions of insulation formation.

The sensor 11 of the average diameter of the cores after drying is multi-pass and is designed to measure the diameters of the insulation of the cores with dried insulation and to obtain the average of these diameters.

The unit 12 for setting the average value of the core diameter after drying is designed to generate a signal corresponding to the nominal value of the average insulation diameter of the cores after drying.

The system for regulating the diameter of the veins on the paper-mass machines works as follows.

In the master unit, the boundary parameters are set for the insulation rate (maximum value) and pulp concentration (minimum value), for the diameter of non-insulated conductors, and for actual insulation formation conditions (composition of the raw materials). The control buttons in block 10 include contactors 16 and 35 in blocks 2 and 3, connecting them to the AC mains through their first inputs. Then, simultaneously, the control buttons in unit 10 accelerate from the motorized potentiometer 24 in unit 2 to the second input and the motorized selsyn 34 in unit 3 to the second input to set the required isolation rate and position of the valve (mass flow). At the same time, the outputs of the flow sensor 32 and the mass concentration 33 are set to a voltage proportional to the corresponding values. Then, using the control button in block 10, the motorized potentiometer 36 is accelerated at the third input of block 3 to set the target for the mass concentration. In the function transducer 7, the predicted value of the diameter Dn is calculated based on the relation (1). The voltage proportional to Dn from the output of the converter 7 is fed to the input of model 9 of the drying oven, from the output of which DM signal is taken, predicting the value of the average diameter at the outlet of the drying oven. The magnitude of the transmission coefficient in the model 9 is set manually based on the previous readings of the measuring instrument PI, located in the converter 7, and the readings of the device, located in block 11. During the process, the value of the transmission coefficient can vary in the range of 0.7-0.9 Depending on the changes in the process mode, the most significant of these changes is the change in the rate of insulation of the cores, and therefore the need to change the mode of insulation drying in the drying oven. The calculation time and the setting of the transfer coefficient of the model 9 are significantly less than the change time

drying mode (due to the significant inertia of the heaters of the furnace), therefore, to set the transfer coefficient, it is not necessary to interrupt the process flow. Model 9 output

0 DM goes to the fourth input of the lag compensation compensation unit 1, where with the help of adders 13 and 14 an algebraic summation of the DM signal occurs with a doubled output signal of the block 12 of the setpoint of the average diameter of the dried insulation DM. Up to a point in time g equal in magnitude to the time it takes for insulated lived to pass through a drying oven, plus the time spent

0 by the sensor 11 to measure isolated conductors, the 2DH-DM signal enters the output of block 1 to the second inputs of blocks 5 and 6. At the time r, the first input of block 1 connected to the input of adder 14 comes with a DC signal from the output of sensor 11. Simultaneously, the output of the variable-delay link 15 to the second input of the adder 13 receives a signal D3, which is a DM signal delayed by time g. Equalizing the delay time of link 15 (realizing the decomposition of the transfer function e p in a number of Paddes, taking into account dca) is carried out here The gain factor of the gain level of the amplifier 176 is based on the signal from the third integrator 178, to the input of which the difference of the signals from the isolation speed sensor 23 from unit 2 and the nominal isolation rate adjuster 180 is applied.

0So, the output of block 1 is the algebraic sum of the signals 2DH-DM + D3-DC. but since the signal e rg at the time moment r arrives at adder 13 with a minus sign, then there is a mutual

5 the destruction of the signals DM and D3. As a result, the output of block 1. remains the algebraic sum of the signals 2DH-DC. which is fed to the second inputs of blocks 5 and 6. A special feature of blocks 5 and 6, which play the role of regulators in the system, is that their inputs should be fed not the deviation of the controlled variable from the nominal value, but the algebraic sum of the nominal DH value and deviation from her first signal DM, a

5 then after the time r of the signal Dc. Since during the technological process there is a continuous change in the signals Dn and DC, at certain points in time the magnitude of the coefficient of transmission of model 9 will not exactly correspond to the magnitude of the coefficient of transmission of the object of regulation. But this discrepancy is quite small (it will be significant if you do not change the coefficient of transmission of model 9 when the process mode changes) and therefore it does not significantly affect the quality of transients in the system. The output signals of blocks 5 and 6 carry out the correction of the average diameter at the output of the control object 4. If the isolation rate or the minimum concentration value in blocks 5 and 6 is exceeded due to the effect of the correction signal from block 1, the compensation of the influence of delay on the diameter control in block 5 or block 6 is turned off until the isolation rate or mass concentration enters the required boundary zone, and control in this case is carried out via a single channel. In this case, the signals to the third input of block 2 and the fourth input of block 3 are stored by the memory elements 46 of blocks 5 and 6.

Thus, the principle of compensation for the effect of delay is implemented in the system for adjusting the diameter of the cores on the pulp and paper machines. Namely, until the time point r, the regulation is carried out by the predicted output signal, and then by its real value. In contrast to the well-known Smith Predictor system, where the predicted output signal is constant, this system generates a predicted signal that carries information about real changes in the controlled variable to the delay link (in this case, a drying oven), which ensures greater accuracy and speed of the system .

Claims (2)

Claim 1. The system for adjusting the diameter of the strands on paper-mass machines, comprising a driver unit, the first and second outputs of which are connected respectively to the first and second inputs of the isolation rate control unit, the third, fourth and fifth outputs, respectively to the first, second, and third inputs adjusting the concentration of pulp and paper pulp, the sixth and seventh outputs, respectively, to the first inputs of the block for selecting the optimal isolation rate and mass concentration, the eighth output, to the first input of the functional converter, the second input of the pulp concentration control unit connected to the first output, the third input - the second output of the unit for regulating the concentration of pulp and paper pulp and with the second input of the unit for selecting the optimal value of the concentration of the pulp, the fourth the input — with the ninth output of the master unit; the fifth input — with the first output of the isolation rate control unit and with the second input of the selection unit for the optimal value of the isolation rate, and the sixth input is with the output of the sensor of the number of insulated cores, and the third input of the isolation rate control unit is connected with the output of the selection unit for the optimal isolation rate, the fourth input of the pulp concentration control unit is connected to the output of the optimum mass concentration selection unit, and the second outputs of the isolation rate control unit and the pulp concentration control unit are connected to the corresponding control object inputs, so that accuracy and system performance, it contains a model of a drying oven, a delay compensation unit, a unit for setting the average diameter of the cores and a sensor for the average diameter of the cores after the dryer, connected the first input with the output of the control object, the second input with the output of the sensor for the number of insulated cores, and the output with the first input of the delay compensation unit connected by the output with the third inputs of the block for selecting optimal values of the isolation rate and mass concentration, the second input - with the output of the setpoint unit of the average diameter of the cores, the third input - with the first output an insulating speed control unit; the fourth input is with an output of a model of a drying oven connected with an input with an output of a functional converter. 2. The system according to claim 1, characterized by the fact that the delay compensation unit contains the first and second adders and a variable-delay link, the first input connected to the third input of the block, the second input to the fourth the input of the block and the first input of the first adder connected by the second input to the output of a variable-delay link, the third input to the second input of the block, and the output to the first input of the second adder connected by the second input to the first input of the block, the third input to the second input block, and the output - to the output of the block. Mlod 0fc. / output 2. / entrance / Zylod // m & Fig.Z 2Y fuKOO Jsxod sh i / Sjrod, i Zbid eleven f So / move 2 6mod FIG L FIG. five Zixe 6 2txo8 3 / jKtf jL i & Xoj f8xo3 nfaod IF II    t1S, t jy $ wim2 .t-f ttlgtojyfaw} ll- l si f 4i I MORE TЈSTЈI + m I HfHbtfTtf b-jl-j Kn / tkbic I. bo / ikue u -j ss T V Tby / / G §I% -  S some | I ii I Fw fajra 9ig.8 five ll 6fon 76W - 8vp - LL- Ibxtf PVJ / 0