SU1414796A1 - Device for checking viscosity of glass mass drop in dropping feeder - Google Patents

Abstract

The invention relates to the manufacture of glass products, can be used to control a drip feeder of a glass melting furnace, and allows an increase in the accuracy of control. The device contains a sensor 1 of the position of the plunger 2 in the feeder 3, the sensor 4 of the position of the drop 5, the sensor 6 of the glass mass, the sensor 7 of the glass melt, the threshold elements 8 and 9, the generator 10 of the census, the driver 11 of the reset, the trigger 12 gate, the coincidence circuit 13 , pulse generator 14, counter 15, memory register 16, multiplication unit 17, transducer 18, scaling converter, basic distance setting unit 19, multiplying digital-to-analogue converter 20, registration unit 21 and point 22 of the feeder. 2 Il. a (L b

Description

1U

The invention relates to the manufacture of glass products and can be used to control a drip feeder of a glass melting furnace.

The aim of the invention is to improve the accuracy of the control.

FIG. 1 shows the functional scheme of the device; in fig. 2- time diagrams of the operation of elements in the device.

The device contains a sensor 1 position of the plunger 2 in the feeder 3, dat-. Chip 4. Position of drop 5, sensor of level 6 of glass melt, sensor 7 of density of glass melt, first 8 and second

9threshold elements shaper

10 censuses, reset shaper 11, strobe trigger 12, coincidence circuit 13, pulse generator 14, counter 15, memory register 16, multiplication unit 17, scaling transducer

the distributor 18, the base Distance adjuster 19 multiplying the digital-analog converter 20 and the registration block 21, the point 22 of the feeder. .

Timing diagrams (Fig.2) show: 23. - output signal of the sensor 1 of the position of the plunger 2; 24 - output signal of the threshold element 8 with a threshold of 25 triggering; 26 is the Vcodb signal of the sensor 4 for the position of the drop 5; 27 is the output signal of a threshold element 9 with a threshold of 28 triggering;

29 - trigger signal 12;

30 is the output of coincidence circuit 13; 31 is the output signal of the census generator 10; 32 - output signal shaper 11 reset; 33 is the output signal of a multiplying digital-to-analog converter 20.

As a sensor. 1 plunger 2 position can be used converters with an output signal of 0-5 mA DC, as a sensor 4 position of the drop - photo relay, as a level sensor 6 - photoelectric glass gauge with an output signal of 0-5 mA DC, as a density sensor 7, a radioisotope densitometer complete with a secondary recording device with an output rheostat sensor; as a recording unit 21, a recording secondary device. As elements 8-20, Logic-I series control elements and Cascade systems can be used. :

6 2

The device works as follows.

To form drops 5, the plunger 2 performs periodic reciprocating movements in the glass mass, vertically, while the sensor 1 of the position of the plunger 2 forms at its output a signal 23, In the upper

the position of the plunger, the formation of a droplet 5 occurs due to the free flow of the glass melt from the point 22 of the feeder 3. Having reached the upper position, the plunger 2 stops,

at the same time, the threshold element B, which is adjusted to the threshold 25 of operation, generates a signal 24 supplied to the inputs of the trigger 12 and the census generator 10. Sensor 4 on hit

in its field of view, droplets 5 of glass melt form a signal 26, fed to the input of the threshold element 9. Upon reaching the set threshold 28 by the signal 26, the threshold element 9 forms

its output signal 27, arriving at. trigger entries 12 and shaper 10 census. Trigger 12 when signals 24 and 27 arrive at its inputs

produces at the output a strobe signal 29 of a single level, the duration of which is equal to the time interval between the leading edges of the signals 24 and 27 of the threshold elements 8 and 9. The coincidence circuit 13 transmits to the input of the counter 15 quantizing pulses 30 of the generator 14 when there is a single gate signal 29.

Counter 15 counts the number of quantizing pulses that are placed in the time interval between the front edges of the signals 24 and 27 of the threshold elements 8 and 9. At the end of

the counting device 10, according to the signal 27 of the threshold element 9, generates a census signal 31, which is fed to the inputs of the memory register 16 and the reset generator 11. This signal counts the counted number of pulses from counter 15 to register 16, after which counter 15 is reset to zero by the signal 32 of the reset generator 11. In an emergency situation, when the viscosity of the drop is higher than

permissible value and the measured time interval is longer than the pulse duration 24, a lock can be provided in the circuit

the census signal by applying an inverted signal from the output of the threshold element 8 to one of the inputs of the census generator 10. The same signal, if necessary, can be used for signaling in case of violation of the technological regime.

The fc outputs of sensors 6 and 7 are proportional to the level and density of the glass melt, are fed to the inputs of multiplication unit 17, from which the signal proportional to their product enters the scaling converter 18. The converter 18 scales the input signal at its input depending on the geometric dimensions of the feeder point and the selected base distance L from the point 22 to the optical axis of the sensor 4, the position of the drop 5, which is set by the setter 19. The distance L is chosen so that The viscosity of the droplet measuring time interval G was certainly less than the pulse duration 24.

From the outputs of the scaling converter 18 and the memory register 16, the signals are fed to the inputs of a multiplying digital-to-analog converter 20, whose function is to multiply a digital code proportional to the measured time interval by the analog signal of the scaling converter 18 and convert the result to the standard analog signal 33 DC registered by block 21.

. When the viscosity of the glass melt changes due to, for example, a change in temperature, the inversely proportional relationship changes, the flow rate of the glass melt from the feeder point causes a corresponding change in the controlled time interval. This change in the time interval, taking into account possible changes in the hydrostatic pressure of the glass mass column (density and level), is recorded by the described device.

The proposed device will allow improving the accuracy of controlling the viscosity of a glass melt drop, ensuring the invariance of the measurement result from the main factor affecting the measurement result

the level and density of the glass melt in the feeder, and will provide an opportunity to directly control the viscosity of a drop prepared for formation,

which differs substantially from the average viscosity of the glass melt in the feeder. Receiving reliable information about the viscosity of a drop creates

Q prerequisites for more: effective management of the further process of glassware formation, which will allow reducing rejects. The use of a device for controlling the viscosity of glass droplets on the type Sh1G-515 feeders produced by glass insulators using the information received by the operator to control the retreat of glassware will reduce

0

sew a reject molding by 1%,

0

five

0

Claims (1)

Invention Formula A device for controlling the viscosity of 5 droplets of glass melt in a drip feeder containing two threshold elements, a trigger, a coincidence circuit, a counter, a pulse generator, ma-. a stacking converter, a base distance setting unit and a registration unit, with one output of the threshold elements connected to the corresponding trigger inputs, the output of which is connected to one input of the coincidence circuit, another input of which is connected to the pulse generator, the output of the matching circuit is connected to one counter input, and Base distance adjuster is connected to one input of a scaling converter, characterized in that, in order to increase the control accuracy, level and density sensors are introduced into it , plunger and glass melt position sensors, census driver, reset driver, memory register, block  multiplying and multiplying a digital-to-analog converter, the plunger position sensor being connected to the input of the first threshold element, the other output of which is connected to one input of the chip generator, the other input of which is connected to another output of the second threshold element, to the input of which the sensor is connected the position of the droplet of the glass melt five 0 five