CN107500519B - Glass plate tempering process control method - Google Patents

Glass plate tempering process control method Download PDF

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Publication number
CN107500519B
CN107500519B CN201710667740.4A CN201710667740A CN107500519B CN 107500519 B CN107500519 B CN 107500519B CN 201710667740 A CN201710667740 A CN 201710667740A CN 107500519 B CN107500519 B CN 107500519B
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heating element
heating
threshold value
value
working
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CN107500519A (en
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赵雁
窦高峰
江春伟
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Luoyang Landi Intelligent Technology Co ltd
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Luoyang Landglass Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature

Abstract

A glass plate tempering process control method comprises the steps that after a glass plate is sent into a heating furnace, a monitoring unit monitors working parameters of a heating element in real time, filtering processing is carried out on the working parameters of the heating element, the working parameters of the heating element after filtering processing are transmitted to a control unit, the control unit compares the received working parameters of the heating element with a set threshold value, and when the working parameters of the heating element are subjected to the maximum value and change again, the set threshold value is reached in the process, the control unit sends out an instruction, and a cooling fan is controlled to be started or to be changed into a working state from an idle state. The invention monitors the working parameters of the heating element in real time after the glass is fed into the furnace, thereby manufacturing the starting time of the cooling fan and changing the estimation of the starting time of the cooling fan by taking time as a basis in the traditional method.

Description

Glass plate tempering process control method
Technical Field
The invention relates to a glass production process, in particular to a glass plate toughening process control method.
Background
In the toughening treatment process of the glass plate, firstly, the glass plate is heated to a softening temperature (for example, 600 ℃ to 700 ℃) in a heating furnace, then the glass plate is rapidly discharged from the furnace and enters a toughening section, and the glass plate is rapidly cooled by blowing air through a fan to finish the toughening treatment. Wherein, in order to realize the rapid cooling of the glass plate, the fan must reach a certain rotating speed in advance and generate enough wind pressure before the glass plate is discharged from the furnace. In the prior art, the common practice is as follows: according to the residual heating time in the heating process of the glass plate, the fan is started or controlled to be changed from an idle state to a working state within a certain time in advance, and the following defects exist in the control mode: firstly, the heating time of the glass plate is estimated according to the thickness of the glass plate multiplied by a time coefficient, and the heating time calculated by experience is very inaccurate, so that the fan is easily started too early or too late; when the glass tempering furnace is opened too early, a large amount of energy can be wasted, the production cost is improved, when the glass tempering furnace is opened too late, the air pressure cannot reach the required numerical value, the tempering stress of the finished glass product can be insufficient, and the product can be directly scrapped. Secondly, the control process is transitionally dependent on experience and quality of operators, so that labor cost is increased, and the improvement of product qualification rate and the long-term stability of product quality are not facilitated.
Disclosure of Invention
The invention aims to solve the problems that the running time of a cooling fan in the prior art is obtained by an estimation mode, and the cooling fan is easily started too early or too late, so that energy waste and product quality are easily caused, and the method for controlling the process of the glass plate tempering process is provided.
In order to solve the technical problems, the invention adopts the technical scheme that:
a glass plate tempering process control method comprises the steps that after a glass plate is sent into a heating furnace, a monitoring unit monitors working parameters of a heating element in real time, filtering processing is carried out on the working parameters of the heating element, the working parameters of the heating element after filtering processing are transmitted to a control unit, the control unit compares the received working parameters of the heating element with a set threshold value, and when the working parameters of the heating element are subjected to the maximum value and change again, the set threshold value is reached in the process, the control unit sends out an instruction, and a cooling fan is controlled to be started or to be changed into a working state from an idle state.
The control unit is a PLC or a PC.
The heating element adopts an electric heating element, and the working parameter of the electric heating element is the total power of the heating element of the heating furnace; the heating element adopts an electric heating element, and the working parameter of the electric heating element is the total power of the heating element of the heating furnace; after the glass plate is sent into the heating furnace, the monitoring unit monitors the total power of the heating element in real time, carries out filtering processing on the total power of the heating element, transmits the total power of the heating element after filtering processing into the control unit and compares the total power with a set threshold value W1, and when the total power of the heating element passes through the maximum value and is less than or equal to the threshold value W1 in the descending process, the control unit sends an instruction to control the cooling fan to be started or to be changed into a working state from an idling state.
The monitoring unit is an electric energy meter, and the total power of the heating element is monitored through the electric energy meter.
The threshold value W1=W0·K，W0=WOften times·MwWherein K is a correction coefficient and has a value range of 0.9-1.1, and W0Is a standard threshold value in a normal temperature state, WOften timesThe total heating power M is the total heating power when the heating furnace is in an idle state and reaches the working temperature under the normal temperature statewCorrection factor for advanced operation of cooling fan, Mw≥1.1。WOften timesWhen the total power of the heating element is determined, the heating furnace is required to be operated in an idle load mode, the total power of the heating element when the heating furnace reaches the working temperature is monitored for multiple times, the average value of the multiple measurement results is obtained, and the average value is measured for 5 times generally. Then determining W0The cooling fan is operated before the glass is discharged, so that the W is required to be adjustedOften timesMaking corrections to run the cooling fan ahead of time, using a correction factor Mw。
The heating element adopts an electric heating element, the working parameter of the electric heating element is the total current value of the heating element of the heating furnace, after the glass plate is sent into the heating furnace, the monitoring unit detects the total current value of the heating element in real time, carries out filtering processing on the total current value of the heating element, then transmits the total current value after the filtering processing into the control unit to be compared with a set threshold value A1, and when the total current value of the heating element passes through the maximum value and is less than or equal to the threshold value A1 in the descending process, the control unit of the heating furnace sends an instruction to control the cooling fan to be started or to be converted into the working state from the idling state.
The monitoring unit is an ammeter, and the total current value of the heating element is monitored through the ammeter.
The threshold value A1=A0·K，A0=AOften times·MAWherein K is a correction coefficient and has a value range of 0.9-1.1, and A0Is a standard threshold value at normal temperature, AOften timesAt normal temperature, the total current, M, when the heating furnace is in an unloaded state and reaches the working temperatureACorrection factor for advanced operation of cooling fan, MA≥1.1。AOften timesWhen the determination is carried out, the heating furnace is required to be operated in an idle load mode, the total current value of the heating element when the heating furnace reaches the working temperature is monitored for multiple times, the average value of the multiple measurement results is obtained, the average value is usually measured for 5 times, and then the average value is measuredDetermination of A0The blower is operated before the glass is discharged, so the pair A is requiredOften timesMaking corrections to operate the fan in advance, using a correction factor MA。
The heating element adopts any one of an electric heating element or a gas heating element, the working parameter of the heating element is the opening ratio of all the heating elements in the heating furnace, and the opening ratio of the heating element is the percentage of the number of the heating elements in the working state to the number of all the heating elements; after the glass plate is sent into the heating furnace, the monitoring unit monitors the opening ratio of the heating element in real time, the monitored opening ratio of the heating element is subjected to filtering processing, the opening ratio after the filtering processing is transmitted into the control unit and is compared with a threshold value K1, and when the opening ratio of the heating element is at the maximum value and is smaller than or equal to the threshold value K1 in the descending process, the control unit sends an instruction to control the cooling fan to be started or to be converted into a working state from an idling state.
And after the number of the heating elements in the working state is monitored by the monitoring unit, the number of the heating elements in the working state of the operation formula/the total number of the heating elements is calculated.
The threshold value K1=K0·K，K0=KOften times·MKWherein K is a correction coefficient and has a value range of 0.9-1.1, and K is0Is a standard threshold value in a normal temperature state, KOften timesAt normal temperature, the open ratio when the heating furnace is in no-load state and reaches the working temperature, MKCorrection factor for advanced operation of cooling fan, MK≥1.1。KOften timesWhen the determination is made, the heating furnace needs to be operated in an idle load mode, the opening ratio of the heating element is monitored for multiple times when the heating furnace reaches the working temperature, the average value of the multiple measurement results is obtained, and the measurement is usually carried out for 5 times. Then determining K0The cooling fan is operated before the glass plate is discharged, so that K is requiredOften timesMaking corrections to run the cooling fan ahead of time, using a correction factor MK。
The heating element adopts any one of an electric heating element or a gas heating element, the working parameter of the heating element is the turn-off ratio of all the heating elements in the heating furnace, and the turn-off ratio of the heating element is the percentage of the number of the heating elements in the turn-off state to the number of all the heating elements; after the glass plate is sent into the heating furnace, the monitoring unit monitors the turn-off ratio of the heating element in real time, the monitored turn-off ratio of the heating element is subjected to filtering processing, the turn-off ratio subjected to filtering processing is transmitted into the control unit and is compared with a threshold value D1, and when the turn-off ratio of the heating element is greater than or equal to the threshold value D1 in the rising process after the turn-off ratio of the heating element is the minimum value, the control unit sends out an instruction to control the cooling fan to be started or to be converted into a working state from an idling state.
After the disconnection ratio is monitored by the monitoring unit, the formula is operated: 1-number of heating elements in the operating state/total number of heating elements.
The threshold value D1=D0·K，D0=DOften times·MDWherein K is a correction coefficient and has a value range of 0.9-1.1, and D0Is a standard threshold value at normal temperature, DOften timesAt normal temperature, the off-load state of the heating furnace reaches the working temperatureDCorrection factor for advanced operation of cooling fan, MD≤0.9。DOften timesWhen the determination is made, the heating furnace needs to be operated in an idle load mode, the disconnection ratio of the heating element when the heating furnace reaches the working temperature is monitored for multiple times, the average value of the multiple measurement results is obtained, and the measurement is usually carried out for 5 times. Then determining D0The cooling fan is operated before the glass sheet is discharged, so that the cooling fan is required to be operated for DOften timesMaking corrections to operate the cooling fan in advance, using a correction factor MD。
The heating element adopts a fuel gas heating element, and the working parameter of the heating element is the fuel gas flow value of the heating element of the heating furnace; after the glass plate is sent into the heating furnace, the monitoring unit monitors the gas flow value of the heating element in real time, carries out filtering processing on the gas flow value, then transmits the gas flow value after filtering processing into the control unit to be compared with a set threshold value R1, and when the gas flow value of the heating element passes through the maximum value and is smaller than or equal to the threshold value R1 in the descending process, the control unit sends an instruction to control the cooling fan to be started or to be converted from an idle state into a working state.
The monitoring unit is a gas flow meter, and the gas flow value of the heating element is monitored through the gas flow meter.
The threshold value R1=R0·K，R0=ROften times·MRWherein K is a correction coefficient and has a value range of 0.9-1.1, and R0Is a standard threshold value in a normal temperature state, ROften timesAt normal temperature, the gas flow value M when the heating furnace is in an idle state and reaches the working temperatureRCorrection factor for advanced operation of the fan, MR≥1.1。ROften timesWhen the determination is made, the heating furnace needs to be operated in an idle load mode, the gas flow value of the heating element when the heating furnace reaches the working temperature is monitored for multiple times, the average value of multiple measurement results is obtained, and the measurement is usually carried out for 5 times. Then determining R0The blower is operated before the glass is discharged, so that the R is required to be adjustedOften timesMaking corrections to operate the cooling fan in advance, using a correction factor MR。
The threshold value is manually input into the control unit through a human-computer interface. And determining a corresponding standard threshold according to no-load operation, selecting a corresponding correction coefficient, and adjusting the selection of K according to the environment temperature. The method for selecting the correction factor K is described below by taking the total power of the heating element as an example. If the ambient temperature is higher than the normal temperature, K is usually less than 1, because the external temperature is too high, the heat dissipation of the heating furnace is reduced, and therefore, the heat dissipation amount to the outside is reduced in an idle state, the heat generated by the heating element is reduced, and the threshold value needs to be adjusted to be reduced; if the ambient temperature is lower than the normal temperature, K is usually greater than 1, because the external temperature is too low, the heat dissipation of the heating furnace is increased, and therefore, under the no-load state, the heat dissipated to the outside is increased, so that the heat generated by the heating element is increased, the threshold value needs to be adjusted to be increased, and if the ambient temperature is equal to the normal temperature, K is 1, namely, the threshold value is not adjusted.
MR、MW、MA、MD、MKThe method comprises the steps of determining one latest opening moment according to experiments, observing corresponding gas flow, total power, total current, opening ratio and disconnection ratio at the moment, and dividing the values by a standard threshold value to determine a correction coefficient of the latest opening.
After the correction coefficient is determined, the corresponding threshold value is determined after the correction with the corresponding standard threshold value is performed, and then the threshold value is input into the control unit by an operator. Or the operator inputs the correction coefficient into the control unit through a human-computer interface, and the control unit calculates the corresponding threshold value according to a formula.
The filtering process is digital filtering process or analog filtering process.
The "operating temperature" in the present invention means: in the tempering process of the glass sheet, when the heating furnace heats different types of glass sheets, the set heating temperature, which is adjusted according to the types of the glass sheets, is common general knowledge of those skilled in the art, and thus will not be described in detail.
The term "reaching a predetermined threshold" in the present invention means: the heating element operating parameter is less than or equal to the threshold value during the descent; or the heating element operating parameter is greater than or equal to the threshold value during the ramp-up.
The invention has the beneficial effects that:
1. the method breaks through the traditional control method taking time as a basis in the technical field, the working parameters (the total power, the total current, the opening ratio or the disconnection ratio of the heating element or the gas flow value of the gas heating element) of the heating element after the glass plate enters the furnace are monitored in real time, and when the working parameters of the heating element reach the operation threshold value of the cooling fan, an instruction is sent to control the operation of the cooling fan.
2. The operation control process of the cooling fan is more reliable and accurate, does not depend on the experience and quality of operators any more, and can reduce the labor cost;
3. the equipment is more intelligent, the operation and the control are simpler and more convenient, and the stability of the production process and the product quality is facilitated.
Drawings
FIG. 1 is a graph of the total power change of the present invention using an electric heating element.
Fig. 2 is a graph of the total current change using the electric heating element in the present invention.
Fig. 3 is a graph showing a variation of an on ratio using an electric heating element in the present invention.
Fig. 4 is a graph showing a variation of the turn-off ratio using the electric heating element in the present invention.
Fig. 5 is a graph showing a variation in gas flow rate using a gas heating element according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings, in which:
example 1
As shown in fig. 1, taking the total heating power of the electric heating element as an example, the control process of the control method of the present invention is as follows:
firstly, determining a heating furnace to be used, adjusting the working temperature of the heating furnace according to the type (such as low-emissivity coated glass and white glass) and thickness information of a glass plate to be heated, enabling the heating furnace to run in a no-load mode to reach the working temperature under the condition that the ambient temperature is normal temperature, monitoring the total power value of a heating element under the condition, measuring the total power value of five different moments, and averaging the five values, wherein the average value is a normal-temperature threshold value WOften timesThen determining a correction coefficient M according to the advanced operation of the cooling fanW，MWHas a value range of MW1.1 or more, preferably 1.1 or less MWLess than or equal to 1.3. Measuring ambient temperature, and comparing with correction coefficient table (the correction coefficient in the table is obtained by calculating that the heating element is used for respectively detecting that the heating furnace under different ambient temperatures reaches the working temperature when no-load operation is carried outTotal power value of the element, dividing each total power value by W0Post-calculation) to determine a correction factor, based on the correction factor K, MWAnd WOften timesBy formula threshold value W1=W0·K，W0=WOften times·MwCalculating to obtain a threshold value W, and enabling an operator to use the threshold value W through a human-computer interface1Input into the control unit.
When the glass plate enters the heating furnace, the total power of the heating elements is monitored in real time through the electric energy meter, the glass plate starts to absorb heat after entering the heating furnace from a low-temperature state, the temperature in the heating furnace is reduced at the moment, in order to keep the constant-temperature working state of the heating furnace, the heating elements in the working state are increased so as to provide more heat, the total heating power of the heating elements is rapidly increased and is constant after reaching the maximum value within a certain time; as the temperature of the glass plate gradually increases, the difference between the temperature of the glass plate and the temperature in the furnace chamber gradually decreases, at this time, the speed of the glass absorbing the heat in the heating furnace becomes slow, the temperature of the glass plate in the heating furnace tends to be constant, the number of the heating elements in the working state gradually decreases, the total power of the heating elements gradually decreases, when the total power of the heating elements monitored by an electric energy meter connected with the heating elements is less than or equal to the set threshold value W1 again after passing through the maximum value, that is, when the total power of the heating elements monitored during the descending process is less than or equal to the set threshold value W1, that is, when the total power of the heating elements monitored for the second time is less than or equal to the set threshold value W1, it is determined that the glass plate has not reached the heating temperature t1, but the cooling fan has reached the operation time, the cooling fan operates earlier than the furnace-out time, as shown in, and then filtering the data curve), that is, at time T1, the driving mechanism acts to control the cooling fan to be turned on or to be changed from an idle state to an operating state.
Example 2
As shown in fig. 2, taking the total current of the electric heating elements as an example, the control process of the control method of the present invention is as follows:
first, the heating to be used is determinedThe furnace is used for adjusting the working temperature of the heating furnace according to the type (such as low-emissivity coated glass and white glass) and thickness information of a glass plate to be heated, enabling the heating furnace to reach the working temperature in a no-load operation mode under the condition that the environmental temperature is normal temperature, monitoring the total current of a heating element in the state, measuring the total current of five different moments, and averaging five values, wherein the average value is a normal temperature threshold AOften timesThen determining a correction coefficient M according to the advanced operation of the cooling fanA，MAHas a value range of MA1.1 or more, preferably 1.1 or less MALess than or equal to 1.3. Measuring ambient temperature, comparing with correction coefficient table (the correction coefficient in the table is obtained by respectively detecting total current values of heating elements when the heating furnace reaches working temperature under different ambient temperatures in no-load operation, and dividing each total current value by A0Post-calculation) to determine a correction factor, based on the correction factor K, MAAnd AOften timesBy formula threshold A1= A0·K，A0=AOften times·MACalculating to obtain a threshold value, and enabling an operator to use the threshold value A through a human-computer interface1Input into the control unit.
When the glass plate enters the heating furnace, the total current of the heating element is monitored in real time through an ammeter, the glass plate starts to absorb heat after entering the heating furnace from a low-temperature state, the temperature in the heating furnace is reduced at the moment, in order to keep the constant-temperature working state of the heating furnace, the heating element in the working state is increased so as to provide more heat, and the total current of the heating element is rapidly increased and is constant after reaching a maximum value within a certain time; with the gradual increase of the temperature of the glass plate, the difference between the temperature of the glass plate and the temperature in the furnace chamber gradually decreases, at this time, the speed of the glass absorbing the heat in the heating furnace becomes slow, the temperature of the glass plate in the heating furnace tends to be constant, the number of the heating elements in the working state gradually decreases, the total current of the heating elements gradually decreases, when an electric energy meter connected with the heating elements monitors that the total current of the heating elements is lower than or equal to a set threshold value A1 for the second time, that is, when the total current of the heating elements is monitored to be lower than or equal to a set threshold value A1 in the descending process, it is determined that the glass plate has not reached the heating temperature t1 at this time, but when the cooling fan reaches the operation time, the cooling fan operates earlier than the time of discharging, as shown in FIG. 2 (the curve in the figure is a graph after filtering the curve according to the change of the, that is, at time T1, the drive mechanism is operated to control the cooling fan to be turned on or to be changed from the idle state to the operating state.
Example 3
As shown in fig. 3, taking the turn-on ratio of the electric heating element as an example, the control process of the control method of the present invention is as follows:
firstly, determining a heating furnace to be used, adjusting the working temperature of the heating furnace according to the type (such as low-emissivity coated glass and white glass) and thickness information of a glass plate to be heated, enabling the heating furnace to run at no-load to reach the working temperature under the condition that the environmental temperature is normal temperature, monitoring the opening ratio of a heating element under the condition, measuring the opening ratios at five different moments, and averaging five values, wherein the average value is a normal-temperature threshold KOften timesThen determining the correction coefficient M of the advanced operation of the cooling fanK，MKHas a value range of MK1.1 or more, preferably 1.1 or less MKLess than or equal to 1.3. Measuring ambient temperature, comparing with correction coefficient K table (the correction coefficient K in the table is obtained by respectively detecting the turn-on ratios of heating elements when the heating furnace reaches working temperature under no-load operation at different ambient temperatures, and dividing each turn-on ratio by K0Post-calculation) determining a correction coefficient according to the correction coefficient K and the correction coefficient M of the cooling fan in advanceKAnd KOften timesBy formula threshold K1= K0·K，K0=KOften times·MKCalculating to obtain a threshold value, and enabling an operator to use the threshold value K through a human-computer interface1Input into the control unit.
After the glass plate enters the heating furnace, the number of the heating elements in the working state is monitored in real time by the monitoring unit, and then the formula is operated: and calculating the number of the heating elements in the working state/the total number of the heating elements to obtain the turn-on ratio of the heating elements. The glass plate starts to absorb heat after entering the heating furnace from a low-temperature state, so that the temperature in the heating furnace is reduced, heating elements in a working state are increased in order to keep a constant-temperature working state, the opening ratio of the heating elements is rapidly increased, and the heating elements are constant after reaching a maximum value within a certain time; along with the gradual rise of the temperature of the glass plate, the difference between the temperature of the glass plate and the temperature in the hearth is gradually reduced, at the moment, the speed of the glass for absorbing the heat in the heating furnace is reduced, the temperature of the glass plate in the heating furnace tends to be constant, the number of the heating elements in a working state is gradually reduced, the opening ratio of the heating elements tends to be gradually reduced, when the heating element on ratio is less than or equal to the set threshold K1 for the second time it is monitored that the heating element on ratio is less than or equal to the set threshold K1 during descent, namely, the glass plate is judged not to reach the heating temperature t1 at this time, but the cooling fan reaches the operation time, the cooling fan operates earlier than the tapping time, as shown in FIG. 3 (the curve in the figure is a graph obtained by filtering the data curve according to the change of the monitored on-off ratio of the heating element), that is, at time T1, the drive mechanism is operated to control the cooling fan to be turned on or to be changed from the idle state to the operating state.
Example 4
As shown in fig. 4, taking the turn-off ratio of the electric heating element as an example, the control process of the control method of the present invention is as follows:
firstly, determining a heating furnace to be used, adjusting the working temperature of the heating furnace according to the type (such as low-emissivity coated glass and white glass) and thickness information of a glass plate to be heated, enabling the heating furnace to run at no-load to reach the working temperature under the condition that the environmental temperature is normal temperature, monitoring the turn-off ratio of a heating element under the condition, measuring the turn-off ratios of five different moments, and averaging five values, wherein the average value is a normal-temperature threshold DOften timesThen determining the correction coefficient M of the advanced operation of the cooling fanD，MDHas a value range of MD0.9 or less, preferably 0.7 or less MDLess than or equal to 0.9. Measuring ambient temperature, and comparing with correction coefficient table (the correction coefficient in the table is obtained by calculating by respectively detecting heating at different ambient temperaturesThe turn-off ratio of the heating element at the time of furnace no-load operation reaching the operating temperature is divided by D0Post-calculation) determining a correction coefficient according to the correction coefficient K and the correction coefficient M of the cooling fan in advanceDAnd DOften timesBy formula threshold D1= D0·K，D0=DOften times·MDCalculating to obtain a threshold value, and enabling an operator to use the threshold value D through a human-computer interface1Input into the control unit.
After the glass plate enters the heating furnace, the number of the heating elements in the working state is monitored in real time by the monitoring unit, and then the formula is operated: 1-number of heating elements in the operating state/total number of heating elements, the turn-off ratio of the heating elements is calculated. The glass plate starts to absorb heat after entering the heating furnace from a low-temperature state, so that the temperature in the heating furnace is reduced, heating elements in a working state are increased in order to keep a constant-temperature working state, the turn-off ratio of the heating elements is reduced, and the heating elements are constant after reaching a minimum value within a certain time; as the temperature of the glass plate gradually rises, the difference between the temperature of the glass plate and the temperature in the hearth gradually decreases, at this time, the speed of the glass absorbing the heat in the heating furnace becomes slow, the temperature of the glass plate in the heating furnace tends to be constant, the number of the heating elements in the working state gradually decreases, the turn-off ratio of the heating elements gradually rises, when the turn-off ratio of the heating elements is higher than or equal to a set threshold value D1 for the second time, namely, the turn-off ratio of the heating elements is monitored to be higher than or equal to a set threshold value D1 in the rising process, namely, the glass plate is judged to not reach the heating temperature T1 at this time, but the cooling fan reaches the operation time, the air cooling fan operates earlier than the time of discharging, at this time, as shown in FIG. 4 (the graph in the figure is a graph obtained by filtering the data curve according to the change of the turn-off, the driving mechanism acts to control the cooling fan to be started or to be changed from an idle state to a working state.
Example 5
As shown in fig. 5, taking the gas flow rate of the gas heating element as an example, the control process of the control method of the present invention is as follows:
firstly, determining a heating furnace to be used, adjusting the working temperature of the heating furnace according to the type (such as low-emissivity coated glass and white glass) and thickness information of a glass plate to be heated, enabling the heating furnace to run at no-load to reach the working temperature under the condition that the environmental temperature is normal temperature, monitoring the gas flow of a heating element under the condition, measuring the gas flow at five different moments, and averaging five values, wherein the average value is a normal-temperature threshold value ROften timesThen determining the correction coefficient M of the advanced operation of the cooling fanR，MRHas a value range of MR1.1 or more, preferably 1.1 or less MRLess than or equal to 1.3. Measuring ambient temperature, comparing with correction coefficient table (the correction coefficient in the table is obtained by respectively detecting gas flow of heating element when the heating furnace reaches working temperature under no-load operation at different ambient temperatures, and dividing each gas flow value by R0Post-calculation) determining a correction coefficient, and performing advanced operation on the fan according to the correction coefficient K and the correction coefficient MRAnd R0By formula threshold R1= R0·K，R0=ROften times·MRCalculating to obtain a threshold value R, and enabling an operator to use the threshold value R through a human-computer interface1Input into the control unit.
When the glass plate enters the heating furnace, the total gas flow of the heating element is monitored in real time through the gas flow meter, the glass plate starts to absorb heat after entering the heating furnace from a low-temperature state, the temperature in the heating furnace is reduced at the moment, in order to keep the constant-temperature working state of the heating furnace, the heating elements in the working state are increased so as to provide more heat, and the gas flow of the heating element is rapidly increased and is constant after reaching a maximum value within a certain time; as the temperature of the glass plate gradually increases, the difference between the temperature of the glass plate and the temperature in the furnace chamber gradually decreases, at this time, the speed of the glass absorbing heat in the heating furnace becomes slow, the temperature of the glass plate in the heating furnace tends to be constant, the number of the heating elements in the working state gradually decreases, the gas flow rate gradually decreases, when a gas flow meter connected with the heating elements monitors that the gas flow rate of the heating elements is lower than or equal to a set threshold value R1 for the second time, that is, when the gas flow rate of the heating elements is monitored to be lower than or equal to a set threshold value R1 in the descending process, it is determined that the glass plate has not reached the heating temperature t1 at this time, but the cooling fan reaches the operation time, the air cooling fan operates earlier than the tapping time, as shown in fig. 5 (the graph in the figure is a graph obtained by filtering the data curve according to the change of the, that is, at time T1, the drive mechanism is operated to control the cooling fan to be turned on or to be changed from the idle state to the operating state.
It should be noted that: the term "normal temperature" in the present invention means 25 ℃, but those skilled in the art can easily think of replacing "normal temperature" with other temperature so as to obtain the corresponding standard threshold value.
The technical solutions and embodiments of the present invention are not limited, and the same solutions or effects as those of the technical solutions and embodiments of the present invention are within the scope of the present invention.

Claims (8)

1. A control method for a glass plate tempering process is characterized by comprising the following steps: after the glass plate is sent into the heating furnace, monitoring unit real-time supervision heating element working parameter, and carry out filtering to heating element working parameter, then the heating element working parameter after filtering is given for the control unit, the control unit compares received heating element working parameter with the threshold value of setting for, after heating element working parameter is through the final value, when the in-process that changes once more reaches the threshold value of setting for, the control unit sends the instruction, control cooling blower opens or changes operating condition into by idle state, concrete method can adopt following arbitrary:
when the heating element adopts an electric heating element and the working parameter of the electric heating element is the total power of the heating element of the heating furnace; after the glass plate is sent into the heating furnace, the monitoring unit monitors the total power of the heating element in real time, filters the total power of the heating element, transmits the total power of the heating element after filtering treatment into the control unit and compares the total power with a set threshold value W1, and when the total power of the heating element passes through the maximum value, the total power of the heating element is loweredWhen the pressure is less than or equal to a threshold value W1, the control unit sends a command to control the cooling fan to be started or to be changed from an idle state to a working state, wherein the threshold value W1=W0·K，W0=WOften times·MwWherein K is a correction coefficient and has a value range of 0.9-1.1, and W0Is a standard threshold value in a normal temperature state, WOften timesThe total heating power M is the total heating power when the heating furnace is in an idle state and reaches the working temperature under the normal temperature statewCorrection factor for advanced operation of cooling fan, Mw≥1.1；
When the heating element adopts an electric heating element and the working parameters of the electric heating element are the total current value of the heating element of the heating furnace, after the glass plate is sent into the heating furnace, the monitoring unit detects the total current value of the heating element in real time, carries out filtering processing on the total current value of the heating element, then transmits the total current value after filtering processing into the control unit to be compared with a set threshold value A1, when the total current value of the heating element passes through the maximum value and is less than or equal to the threshold value A1 in the descending process, the control unit of the heating furnace sends an instruction to control the cooling fan to be started or to be converted from an idling state into a working state, and the threshold value A1=A0·K，A0= AOften times·MAWherein K is a correction coefficient and has a value range of 0.9-1.1, and W0Is a standard threshold value at normal temperature, AOften timesAt normal temperature, the total current value M when the heating furnace is in an idle state and reaches the working temperatureACorrection factor for advanced operation of cooling fan, MA≥1.1；
When the heating element adopts any one of an electric heating element or a fuel gas heating element and the working parameter is the opening ratio of all the heating elements in the heating furnace, the opening ratio of the heating element is the percentage of the number of the heating elements in the working state to the number of all the heating elements; after the glass plate is sent into the heating furnace, the monitoring unit monitors the opening ratio of the heating element in real time, the monitored opening ratio of the heating element is filtered, the filtered opening ratio is transmitted into the control unit to be compared with a threshold value K1, and when the opening ratio of the heating element is compared with the threshold value K1After the maximum value is exceeded, when the value is less than or equal to a threshold value K1 in the descending process, the control unit sends a command to control the cooling fan to be started or to be changed from an idle state to a working state, wherein the threshold value K1=K0·K，K0= KOften times·MKWherein K is a correction coefficient and has a value range of 0.9-1.1, and K is0Is a standard threshold value in a normal temperature state, KOften timesAt normal temperature, the open ratio when the heating furnace is in no-load state and reaches the working temperature, MKCorrection factor for advanced operation of cooling fan, MK≥1.1；
When the heating element adopts any one of an electric heating element or a gas heating element and the working parameter is the turn-off ratio of all the heating elements in the heating furnace, the turn-off ratio of the heating element is the percentage of the number of the heating elements in the turn-off state to the number of all the heating elements; after the glass plate is sent into the heating furnace, the monitoring unit monitors the turn-off ratio of the heating element in real time, the monitored turn-off ratio of the heating element is subjected to filtering processing, the turn-off ratio subjected to filtering processing is transmitted into the control unit and is compared with a threshold value D1, when the turn-off ratio of the heating element is greater than or equal to the threshold value D1 in the rising process after the turn-off ratio of the heating element is at the minimum value, the control unit sends an instruction to control the cooling fan to be started or to be changed into a working state from an idling state, and the threshold value D1=D0·K， D0= DOften times·MDWherein K is a correction coefficient and has a value range of 0.9-1.1, and D0Is a standard threshold value at normal temperature, DOften timesAt normal temperature, the off-load state of the heating furnace reaches the working temperatureDCorrection factor for advanced operation of cooling fan, MD≤0.9；
When the heating element adopts a fuel gas heating element and the working parameter of the heating element is the fuel gas flow value of the heating element of the heating furnace; after the glass plate is sent into the heating furnace, the monitoring unit monitors the gas flow value of the heating element in real time, carries out filtering processing on the gas flow value, then transmits the gas flow value after filtering processing into the control unit to be compared with a set threshold value R1, and when the gas flow value of the heating element is burnt, the gas flow value is filteredAfter the airflow value passes through the maximum value, when the airflow value is smaller than or equal to a threshold value R1 in the descending process, the control unit sends a command to control the cooling fan to be started or to be changed from an idle state to a working state, wherein the threshold value R1=R0·K，R0= ROften times·MRWherein K is a correction coefficient and has a value range of 0.9-1.1, and R0Is a standard threshold value in a normal temperature state, ROften timesAt normal temperature, the gas flow value M when the heating furnace is in an idle state and reaches the working temperatureRCorrection factor for advanced operation of cooling fan, MR≥1.1。
2. The method of claim 1, wherein the method comprises: the monitoring unit is an electric energy meter.
3. The method of claim 1, wherein the method comprises: the monitoring unit is an ammeter.
4. The method of claim 1, wherein the method comprises: and after the number of the heating elements in the working state is monitored by the monitoring unit, the formula is operated, and the number of the heating elements in the working state/the total number of the heating elements are calculated.
5. The method of claim 1, wherein the method comprises: after the disconnection ratio is monitored by the monitoring unit, the formula is operated: 1-number of heating elements in the operating state/total number of heating elements.
6. The method of claim 1, wherein the method comprises: the monitoring unit is a gas flow meter.
7. The method of claim 1, wherein the method comprises: the threshold value is manually input into the control unit through a human-computer interface.
8. The method of claim 1, wherein the method comprises: the filtering process is digital filtering process or analog filtering process.
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CN107515637B (en) * 2017-08-07 2020-08-28 洛阳兰迪玻璃机器股份有限公司 Glass plate tempering process control method
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