SU1178695A1 - Device for controlling the charging of glassmaking furnace - Google Patents

Abstract

A DEVICE FOR CONTROLLING A GLASS BURNING KNOBLES LOADING, containing a glass melt sensor and level adjuster, charge loader drive control units, load charge adjusters and limit switches of the drive loaders according to their number and a correction device, the master and the level sensor are connected to the corresponding correction inputs, and the correcting inputs of the load actuators, and the corrective device, the setting actuator and the level sensor are connected to the corresponding correction inputs, they are connected to the corresponding correction inputs, and the corrective device, the setting control and the level sensor are connected to the corresponding correction inputs, they are connected to the corresponding correction inputs, and the corrective device, the setting control and the level sensor are connected to the corresponding correction inputs, they are connected to the corresponding correction inputs, and the corrective device, the setting control and the level sensor are connected to the corresponding correction inputs, they are connected to the corresponding correction inputs, and the corrective device, and the setting power source and the load level sensor are connected to the corresponding correction inputs, and the corrective device, and the setting control and the level sensor are connected to the corresponding correction inputs, and the correcting inputs of the load control actuators, and It is distinguished that, in order to increase the control accuracy due to the distribution of the charge in the center and along the edges of the boot pocket, it is equipped with control blocks for the rhythm Drivers are based on the number of loaders and the frequency signal converter, the output of the frequency signal converter is connected to the first inputs of the download rhythm control block, the second inputs of which are connected to the corresponding charge control devices of the boot loaders are connected to the third inputs of the download rhythm control blocks, the outputs of which are are connected to the corresponding control units of the drives of the charge loaders, and the input of the frequency signal converter is connected to the output of the correction device. kl 00 Od; D cl

Description

The invention relates to glass industry and can be used in the processes associated with the charge loading in a glass melting furnace. The aim of the invention is to improve the control accuracy by distributing the charge in the center and along the edges of the loading pocket. Figure 1 shows the process and block diagram of the device; FIG. 2 is a diagram of a frequency signal converter) FIG. 3 is a block diagram of a download rhythm control unit and a digital code generator. The device for controlling the charging charge in a glass melting furnace contains a glass melting furnace 1 with a cooking basin above the loading pocket of which there are h loaders 2 with drive 3 (can take values from 1 to 8) and consumable bins 4 of charge 5 loaded as a group of 6 into the glass melting furnace 1. The position of the loaders 2 is controlled by limit switches 7, the position of the glass mass level is controlled by a level 8 sensor. The device also contains a correction device 9, a potentiometric level adjuster 10, a frequency signal converter 11, load rhythm control blocks 12 of digital load charge code setrers 13, a thyristor power control unit 14 at loader waters. The frequency signal block is designed to convert a 0-5 mA signal from a correction device 9 into a frequency signal of trigger pulses. Unit 11 consists of a polarity switch, including an operational amplifier 15, a transistor 16 and resistors 17-20, integrators including an operational amplifier 21, an e-bone 22 and resistors 23-25, a comparator, an enable amplifier 26 and resistors 27- 29, and an inverter amplifier, including an operational amplifier 30, and resistors 31-33, a frequency divider, including counters 34-36, a matching circuit 38, and a multivibrator waiting, including triggers 39 and 40, resistors 41, and capacitance 42. Rhythm control unit 12 boot ki is intended to form a command on chenie actuator 3 download snip 2 and charge control rhythm for Booting. Functionally related to the digital code setting device 13, which determines the rhythm of operation and the number of charge backfills in one switching cycle. Block 12 consists of a pulse counter 43-46 of the matching circuit 47, standby multivibrators 48 and 49, resistor 50 and capacitor 51, triggers 52 and 53, inverters 54 and 55, standby multivibrators (on triggers) 56 and 57, resistor 58 and capacitance 59 , pulse generator (on triggers) 60 and 61, 62, capacitance 63, amplifying element 64, zener diode 65 and resistor 66. Digital code generator 13 consists of four bits 67-70 counters. Reed limit switches can be used as limit switches. As a level sensor, a differential transformer converter can be used, which is included in the URP level gauge kit. As a corrective device can be used Lribor KP2-PZ. As a potentiometric unit, an ED-50 device can be used. As digital code setters, devices of type EZZ.602.525-04 can be used. The PT series starters can be used as the terristor units. The device works as follows. A continuous signal from sensors 8 is fed to a correction device 9. The input of a correction device 9 is supplied from a potentiometric level indicator 10. The error signal in the form of DC voltages 0-5 mA from a correction device 9 is fed to a frequency signal converter 11, it is converted into a sequence of pulses with a specific follow-up period. The frequency of the pulses is related to the error input signal. In the event of an increase in the input error signal, corresponding to a decrease in the glass mass level, the pulse frequency decreases. These pulses are triggers.

For control units of the rhythm of loading, where when a trigger pulse arrives, trigger 52 and 53 are switched, a command is generated to turn on bootloader 2. A trigger to trigger 52 and 53 to start up the bootloader occurs after a specified number of backfills has been worked out in one group 7, Backfill One group 7, when the individual loader 2 is turned on once, is set using one bit of a digital code setter 13 and can vary discretely from 1 to 9. The other three bits of a digital code set point 13 are It is compressed to change the frequency of the start-up pulses and, therefore, to change the rhythm of switching on individually each of the 2 charge loaders. The division ratio is set numerically for each loader 2 and may be the same. In this case, the loaders (2-2 and) will turn on synchronously and the performance of all the loaders (2-2 P) of the charge will be the same in the front of the boot pocket. However, the presence of convection currents in the glass melts does not allow the charge to be evenly distributed over the glass mass mirror and leads to charge transfer from the central zone of the loading pocket to its edges, which leads to uneven melting of the charge and uneven distribution of the gaps of the 7 mm width. Therefore, it is reasonable that the charge is uneven. on the front of the boot pocket. This is achieved by setting a different division ratio of the trigger pulses from the frequency signal converter 11. In this case, the frequency of switching on the loader 2 of the central zone should be higher than in the intermediate and extreme ones. The presence of individual digital code setters 13 in each block 12 allows for any proportion and ratio of the operating time of the loaders, however, the switching frequency of each of the loaders remains not a random value, but proportional to the glass melt level. This principle of converting an analog signal of a glass melt level into a frequency signal of the switching on rhythm of the loaders, in addition, provides

86954

continuous monitoring of the level and continuous adjustment of the distance between the rows 7 of the charge.

In the steady state operation, by selecting the division ratio of the starting pulses, a loading mode is obtained which would ensure optimal distribution of the charge in the boot pocket and keep the glass melt level within the specified limits. In the case of a decrease in the glass mass level, the frequency of the start-up pulses in the converter 11 increases and, consequently, the switching frequency of the charge loaders 2 is accelerated. As the i-normal level is reached, the error signal decreases, and the trigger pulse frequency comes to

Q source. Thus, the startup frequency is monitored continuously and automatically upset.

The converter 11 of the frequency signal operates as follows.

5 The DC signal converter circuit uses the principle based on the periodic inversion of the voltage supplied to the integrator input. Depending on whether the switch 16 is open or closed, the polarity switch multiplies the input voltage by -1 or +1. The integration of the input voltage in each direction continues until the comparator operates, after which the state of the transistor 16 changes, and then the direction of integration. At the output of the comparator, a frequency signal of 0-10 kHz is generated. This frequency is reduced to a frequency of 1-10 Hz. With the help of the divider, the frequency signal is fed to the standby multivibrator, which generates trigger pulses. This impulse goes to the load rhythm control blocks.

The download rhythm control unit 12 operates as follows.

Upon receipt of the start-up pulses from the converter 11 of the frequency signal of the counter on the elements 44-46, the impulses are recalculated. When this occurs, the frequency division with a given coefficient. Decryption of a given frequency is carried out in three bits ;; code setter 13. When the set frequency is reached at the outputs of the code setter,

three logical 1, which arrive at the circuit 47 matches. A logical O is generated at the output of the circuit A7, which starts the waiting multivibrator. At the output of the capacitance 51, a pulse is generated which resets the counters 44-46 to the initial position and they start again the frequency recalculation and switch the trigger 52 and 53. At the output of the trigger 52 there is a logical O, which is a command to turn on the thyristor control unit 14 drives 3 loaders 2 charges. The number of backfillings in each cycle of operation depends on the number of digital encoder set in section 67. Pulses from the limit switch 7 are fed through inverter 55 and the driver of pulses to the input of counter 43. The trigger signal 51 decrypts the output state of counter 43 with a given code (number backfilling), the output of the counter 67 appears logical 1, which is fed to the inverter 54. From the inverter 54, the logical O is fed to the multivibrator, which

switches trigger 52 and 53 to the initial state. The command at the output of the amplifying element 64 is terminated. When forming the next start pulse, the cycle repeats. Thus, unit 12 allows the formation of a rhythm of loading proportional to the level of glass melt and varying by supplying the charge to the storage pocket in different ratios.

The device produces an uneven supply of charge on the front of the boot pocket of a glass melting furnace,

performs any proportion and ratio of the time of work of the loaders by using individual code setters in each block of the rhythm of loading,

carries out continuous monitoring of the level of glass melt and continuous adjustment of the distance between the rows of the charge.

The use of the device on the stove with

an area of the cooking part of 48 m makes it possible to increase its productivity from 125 to 140 tons / day and reduce the temperature of the roof from 1510 to.

"N ni

: h

e444-1 U

UT

w:

44-i

00

f

p

13;

S (sra

J, j

Claims (1)

DEVICE FOR MANAGING THE LOADING OF THE BATCH INTO A GLASS FURNACE, containing a sensor and a glass level adjuster, control units for charge loader drives, charge load adjusters and limit switches for loader drives in terms of their number and a correction device, the controller and level sensor being connected to the corresponding inputs of the correction device characterized by the fact that, in order to improve control accuracy due to the distribution of the charge in the center and along the edges of the loading pocket _t ·. it is equipped with load rhythm control units according to the number of boot loaders and a frequency signal converter, the output of the frequency signal converter being connected to the first inputs of the load rhythm control unit, the second inputs of which are connected to the respective charge load adjusters, the end switches of the loader drives are connected to the third inputs of the blocks load rhythm control, the outputs of which are connected to the respective control units of the charge loader drives, and the input of the frequency signal converter and connected to the output correction unit. SU, .1178695> 1178695 2