CN107572763B - Glass plate tempering process control method - Google Patents
Glass plate tempering process control method Download PDFInfo
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- CN107572763B CN107572763B CN201710667737.2A CN201710667737A CN107572763B CN 107572763 B CN107572763 B CN 107572763B CN 201710667737 A CN201710667737 A CN 201710667737A CN 107572763 B CN107572763 B CN 107572763B
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Abstract
The utility model provides a glass board tempering process control method, the glass board gets into the heating furnace after, monitoring unit real-time supervision heating element working parameter, and carry out filtering to heating element working parameter, then give the control unit heating element working parameter after filtering, the control unit compares received heating element working parameter with N threshold value of settlement respectively, when heating element working parameter reaches the xth threshold value of settlement after the most value, the control unit sends the instruction, adjust high temperature fan rotational speed and be Sx. The invention can more scientifically and accurately control the rotating speed of the high-temperature fan in the convection heating process of the glass plate by monitoring the working parameters of the heating element in real time in the operation process of the heating furnace, thereby improving the quality of the finished product of the toughened glass.
Description
Technical Field
The invention relates to a glass production process, in particular to a glass plate toughening process control method.
Background
In the tempering treatment process of the glass sheet, first, the glass sheet is heated to a softening temperature (for example, 600 to 700 ℃) in a heating furnace, and then, rapidly taken out of the furnace into a tempering section, and the tempering treatment is completed by rapid cooling. Among them, convection heating is a very important heating form of a glass plate, and its principle is to blow hot air to the glass plate by using a high temperature blower to heat the glass plate. For a convection type glass plate heating furnace, when a glass plate just enters the furnace, the heat conduction speed of a ceramic roller way to the glass plate is the fastest, in order to avoid the phenomenon that the edge part of the glass plate is warped upwards, a high-temperature fan needs to operate at a higher rotating speed or power, along with the rise of the temperature of the glass plate, the heat conduction speed of the ceramic roller way to the glass plate is reduced, the glass plate is gradually softened, at the moment, in order to avoid the phenomenon that the flatness of the glass plate in a softened state is deteriorated due to overlarge wind pressure, and the rotating speed or power of the high-. As shown in fig. 1, in the prior art, the operation process of the high temperature fan is divided into several stages according to the heating time of the glass plate, and the high temperature fan operates at a certain rotation speed in each stage. In the actual production process, the determination of the time node of each stage and the selection of the rotating speed of the high-temperature fan of each stage need to be manually determined according to the type and the thickness of the glass plate by relying on the operation experience. This control method has the following technical drawbacks: 1. the operation process of the high-temperature fan cannot be accurately controlled, and the glass plate is easy to warp and deform in the heating process, so that the quality of a finished product of toughened glass is influenced; 2. the transition depends on the experience and quality of operators, which not only increases the labor cost, but also is not beneficial to the improvement of the qualified rate of products and the long-term stability of the quality.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the time node for adjusting the speed of a high-temperature fan is difficult to control and the quality of glass is easily influenced, and provides a glass plate tempering process control method.
In order to solve the technical problems, the invention adopts the technical scheme that:
a glass plate tempering process control method is characterized in that the maximum value of working parameters of heating elements of each furnace of a heating furnace is defined as a maximum threshold value, the maximum value of the working parameters is that the heating furnace starts to work under the condition of setting a loading capacity, N different threshold values are selected according to the maximum value of the working parameters in the process, the N threshold values are not greater than the maximum threshold value, the rotation speed of a high-temperature fan corresponding to the x-th threshold value is set as Sx, wherein x is greater than or equal to 1 and less than or equal to N; after the glass plate enters the heating furnace, the monitoring unit monitors working parameters of the heating element in real time, the working parameters of the heating element are subjected to filtering processing, then the working parameters of the heating element after the filtering processing are transmitted to the control unit, the control unit compares the received working parameters of the heating element with the set N thresholds respectively, when the working parameters of the heating element reach the set x threshold after the maximum value, the control unit sends an instruction, and the rotating speed of the high-temperature fan is adjusted to be Sx.
The first threshold value to the xth threshold value are sequentially decreased, the first threshold value is 0.9-1.0 time of the maximum threshold value, the last threshold value is 0.1-0.2 time of the maximum threshold value, and the corresponding rotation speed of the high-temperature fan is S1To Sx, S1Sx is the variation of the rotation speed of the high temperature fan, and the speed is selected according to the thickness and the type of the glass plate, which is the operation speed known in the art, and therefore, the detailed description is omitted here.
The heating element is an electric heating element and worksThe parameter is the total heating power of the heating element of the heating furnace; defining the maximum value of the total power of the heating elements of each furnace as a maximum threshold value PmaxThe maximum value of the total power of the heating element is the maximum value of the total power of the heating element in the process that the heating furnace works under the condition of setting the loading capacity, and N different threshold values P are taken1、P2、...PNAnd none of the N different thresholds is greater than PmaxSetting the x-th threshold value P of the N different threshold valuesxThe rotating speed of the corresponding high-temperature fan is Sx; 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, and then transmits the total power of the heating element after filtering treatment into the control unit and a set threshold value PxComparing, when the total power of the heating elements is less than or equal to the threshold value P after passing through the maximum valuexAnd when the high-temperature fan is started, the control unit sends an instruction to adjust the rotating speed of the high-temperature fan to Sx.
The monitoring unit is an electric energy meter, and the total power of the heating element is monitored through the electric energy meter. .
The heating element adopts an electric heating element, the working parameter of the electric heating element is the total current value in the heating element of the heating furnace, and the maximum value of the total current value of the heating element of each furnace is defined as the maximum threshold value AmaxThe maximum value of the total current value is the maximum value of the total current value of the heating element in the process that the heating furnace works under the condition of setting the loading capacity, and N different threshold values A are taken1、A2...ANAnd none of the N different thresholds is greater than AmaxSetting the xth threshold A of the N different thresholdsxCorresponding to the rotating speed S of the high-temperature fanx(ii) a After the glass plate is sent into the heating furnace, the monitoring unit monitors the total current value of the heating element in real time, carries out filtering processing on the total current value, then transmits the total current value after the filtering processing into the control unit to be compared with a set threshold value Ax, and when the total current value of the heating element is smaller than or equal to the threshold value Ax after passing through the maximum value, the control unit sends an instruction to adjust the rotating speed of the high-temperature fan to Sx.
The monitoring unit is an ammeter, and the total current value of the heating element is monitored through the ammeter.
The heating element adopts any one of an electric heating element or a fuel 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; defining the maximum value of the opening ratio of the heating elements of each furnace as a maximum threshold value KmaxThe maximum value of the opening ratio is that the heating furnace works under the condition of setting the loading capacity, in the process, the maximum value of the opening ratio of the heating element is obtained, and N different threshold values K are taken1、K2...KNAnd none of the N different thresholds is greater than KmaxSetting the xth threshold K of the N different thresholdsxThe rotating speed of the corresponding high-temperature fan is Sx; 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 subjected to filtering processing is transmitted into the control unit and is compared with a threshold Kx, and when the opening ratio of the heating element is smaller than or equal to the threshold Kx after passing through the maximum value, the control unit sends an instruction and adjusts the rotation speed of the high-temperature fan to Sx.
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.
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 disconnection ratio of all the heating elements in the heating furnace, and the disconnection ratio of the heating element is the percentage of the number of the heating elements in a disconnection state to the number of all the heating elements; defining the maximum value of the turn-off ratio of the heating elements per furnace as a maximum threshold value DmaxThe maximum value of the turn-off ratio is the maximum value of the turn-off ratio of the heating element in the process that the heating furnace starts to work under the condition of setting the loading capacity, and N different threshold values D are taken1、D2...DNAnd none of the N different thresholds is greater than DmaxSetting the xth threshold D of the N different thresholdsxCorresponding to the rotating speed S of the high-temperature fanx(ii) a 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, carries out filtering processing on the monitored turn-off ratio, then transmits the turn-off ratio after the filtering processing into the control unit to be compared with a threshold Dx, and when the turn-off ratio of the heating element is greater than or equal to the threshold Dx after passing through the minimum value, the control unit sends an instruction to adjust the rotating speed of the high-temperature fan to Sx.
And after the number of the heating elements in the working state is monitored by the monitoring unit, the formula of 1-the number of the heating elements in the working state/the total number of the heating elements is calculated.
The heating element adopts a gas heating element, the working parameter of the gas heating element is the gas flow value in the heating element of the heating furnace, and the maximum value of the gas flow of each heating element of the furnace is defined as a maximum threshold value RmaxThe maximum value of the gas flow is that the heating furnace works under the condition of setting the loading capacity, the maximum value of the gas flow of the heating element in the process is taken as N different threshold values R1、R2...RNAnd none of the N different thresholds is greater than RmaxSetting the x-th threshold R of the N different thresholdsxCorresponding to the rotating speed S of the high-temperature fanX(ii) a 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 of the heating element, then transmits the gas flow value after filtering processing into the control unit to be compared with a set threshold Rx, and when the gas flow value of the heating element is smaller than or equal to the threshold Rx after passing through the maximum value, the control unit sends an instruction to adjust the rotating speed of the high-temperature fan to Sx.
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 and the corresponding high-temperature fan rotation speed Sx are manually input into the control unit through a human-computer interface.
The filtering process is digital filtering process or analog filtering process.
In the present invention, "reaching" the threshold means: the heating element operating parameter is less than or equal to the threshold value during descent, or the heating element operating parameter is greater than or equal to the threshold value during ascent.
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, and can more scientifically and accurately control the rotating speed (operating power) of a high-temperature fan in the convection heating process of the glass plate by monitoring the operating 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 in the operating process of the heating furnace in real time, thereby effectively avoiding the conditions of warping and deformation of the glass plate in the heating process and further improving the finished product quality of the toughened glass.
2. The setting of the operation parameters of the high-temperature fan in the heating process does not depend on the experience and quality of operators any more, so that the labor cost is reduced, the equipment is more intelligent, the operation is 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 according to the glass to be heatedAdjusting the working temperature of the heating furnace according to the plate type (such as low-emissivity coated glass and white glass) and thickness information, monitoring the total power of the heating element when the heating element operates at a set loading capacity, and when the total power of the heating element rises to a maximum value, selecting five values to calculate an average value, wherein the average value is a maximum threshold value PmaxThen, N =5 is taken, i.e. five different thresholds, respectively P1、P2、P3 、P4 、P5Corresponding speeds are respectively S1、S2、S3、S4、S5In which P is1=Pmax，P1、P2、P3 、P4 、P5Decreasing in sequence, P5=0.1PmaxThe operator sends P through the human-computer interface1、P2、P3 、P4 、P5And S1、S2、S3、S4、S5Input into the control unit.
When the glass plate enters the heating furnace, the total power of the heating element is monitored in real time through the electric energy meter, the glass plate starts to absorb heat after entering the heating furnace from a normal temperature state, the temperature in the heating furnace is reduced at the moment, the heating element is gradually switched on in order to keep the constant temperature working state of the heating furnace, so that more heat is provided, the total heating power of the heating element is rapidly increased at the moment, and the total heating power is constant after being increased to a maximum value within a certain time; along with the gradual rise of the temperature of the glass plate, the difference value between the temperature of the glass plate and the temperature in the hearth is gradually reduced, at the moment, the speed of the glass plate for absorbing heat in the heating furnace is slowed down, 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, and the total power of the heating elements tends to be gradually reduced. When the electric energy meter connected with the heating element monitors the total power of the heating element, the rotation speed of the high-temperature fan is adjusted after the maximum value is passed. The graph of fig. 1 is a graph of the change in total power of the heating element as monitored, followed by filtering of the data curve. When the total power of the heating element is less than or equal to P during the descent1In time, the rotating speed of the high-temperature fan is adjustedIs as a whole S1(ii) a When the total power of the heating element is less than or equal to P during the descent2In the meantime, the rotation speed of the high-temperature fan is adjusted to S2(ii) a When the total power of the heating element is less than or equal to P during the descent3In the meantime, the rotation speed of the high-temperature fan is adjusted to S3(ii) a When the total power of the heating element is less than or equal to P during the descent4In the meantime, the rotation speed of the high-temperature fan is adjusted to S4(ii) a When the total power of the heating element is less than or equal to P during the descent5In the meantime, the rotation speed of the high-temperature fan is adjusted to S5。
Example 2
As shown in fig. 2, taking the total current of the electric heating elements as an example, the control process of the heating 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, monitoring the total current value of a heating element when the heating element operates at a set loading capacity, selecting five values to calculate an average value when the total current value of the heating element rises to a maximum value, wherein the average value is a maximum threshold value AmaxThen, N =5 is taken, i.e. five different thresholds, respectively a1、A2、A3 、A4 、A5Corresponding speeds are respectively S1、S2、S3、S4、S5Wherein A is1=Amax，A1、A2、A3 、A4 、A5Successive decrease, A5=0.1AmaxThe operator connects A through a man-machine interface1、A2、A3 、A4 、A5And S1、S2、S3、S4、S5Input 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 the ammeter, the glass plate starts to absorb heat after entering the heating furnace from a normal temperature state, the temperature in the heating furnace is reduced at the moment, and the heating element is used for keeping the constant temperature working state of the heating furnaceThe heating element is gradually switched on so as to provide more heat, and the total current value of the heating element is rapidly increased and is constant after rising to the highest value within a certain time; the temperature of the glass plate gradually rises, the difference value between the temperature of the glass plate and the temperature in the hearth is gradually reduced, the speed of the glass plate for absorbing 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 total current value of the heating elements is gradually reduced, and when an ammeter connected with the heating elements monitors that the total current value of the heating elements passes through the maximum value, the rotation speed of the high-temperature fan is adjusted. The graph in fig. 2 is a graph of the change in the total current of the heating element as monitored, and then the data curve is filtered. When the total current value of the heating element is less than or equal to A during the falling process1In the meantime, the rotation speed of the high-temperature fan is adjusted to S1(ii) a When the total current value of the heating element is less than or equal to A during the falling process2In the meantime, the rotation speed of the high-temperature fan is adjusted to S2(ii) a When the total current value of the heating element is less than or equal to A during the falling process3In the meantime, the rotation speed of the high-temperature fan is adjusted to S3(ii) a When the total current value of the heating element is less than or equal to A during the falling process4In time, the rotating speed of the high-temperature fan needs to be adjusted to S4(ii) a When the total current value of the heating element is less than or equal to A during the falling process5In the meantime, the rotation speed of the high-temperature fan is adjusted to S5。
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 heating 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, monitoring the opening ratio of a heating element when the heating element operates at a set loading capacity, and when the opening ratio of the heating element is increased to the maximum value, the average value is the maximum threshold value KmaxThen, N =5 is taken, i.e. five different thresholds, respectively K1、K2、K3 、K4 、K5Corresponding speeds are respectively S1、S2、S3、S4、S5In which K is1=Kmax，K1、K2、K3 、K4、K5Successive decrease, K5=0.1KmaxThe operator connects K through the man-machine interface1、K2、K3 、K4 、K5And S1、S2、S3、S4、S5Input 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 normal temperature state, so that the temperature in the heating furnace is reduced, the heating element is gradually opened to provide more heat for keeping the constant temperature working state of the heating furnace, and the opening ratio of the heating element is rapidly increased and is constant after being increased to a maximum value within a certain time; the temperature of the glass plate gradually rises, the difference value between the temperature of the glass plate and the temperature in the hearth gradually decreases, the speed of the glass plate for 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 a working state gradually decreases, the opening ratio of the heating elements gradually decreases, and when the opening ratio of the heating elements passes through the maximum value, the rotation speed of the high-temperature fan starts to be adjusted. The graph in fig. 3 is a graph of the monitored change in the on-ratio of the heating element, followed by filtering the data curve. When the on-state ratio of the heating element is less than or equal to K during the fall1In the meantime, the rotation speed of the high-temperature fan is adjusted to S1(ii) a When the on-state ratio of the heating element is less than or equal to K during the fall2In the meantime, the rotation speed of the high-temperature fan is adjusted to S2(ii) a When the on-state ratio of the heating element is less than or equal to K during the fall3In the meantime, the rotation speed of the high-temperature fan is adjusted to S3(ii) a When the on-state ratio of the heating element is inIs less than or equal to K during descent4In the meantime, the rotation speed of the high-temperature fan is adjusted to S4B, carrying out the following steps of; when the on-state ratio of the heating element is less than or equal to K during the fall5In the meantime, the rotation speed of the high-temperature fan is adjusted to S5。
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 heating 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, monitoring the turn-off ratio of a heating element when the heating element operates at a set loading capacity, selecting five values to calculate an average value when the turn-off ratio of the heating element is increased to a maximum value, wherein the average value is a maximum threshold value DmaxThen, N =5 is taken, i.e. five different thresholds, respectively D1=0.05Dmax、D2=0.4Dmax、D3 =0.5Dmax、D4=0.8Dmax、D5=0.9DmaxThe corresponding high temperature fan rotation speed is S1、S2、S3、S4、S5The operator uses the human-computer interface to display the D1、D2、D3 、D4 、D5And S1、S2、S3、S4、S5Input 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 normal temperature state, so that the temperature in the heating furnace is reduced, heating elements are gradually switched on (namely the number of the heating elements in a disconnected state is reduced) in order to keep a constant temperature working state of the heating furnace, so that more heat is provided, the disconnection ratio of the heating elements is rapidly reduced, and the heating elements are constant after being reduced to a minimum value within a certain time; follow-up glassThe temperature of the glass plate is gradually increased, the difference value between the temperature of the glass plate and the temperature in the hearth is gradually reduced, the speed of the glass plate for absorbing 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 the working state is gradually reduced (namely the number of the heating elements in the off state is gradually increased), the off ratio of the heating elements is gradually increased, and when the off ratio of the heating elements passes through the minimum value, the rotating speed of the high-temperature fan is adjusted. The graph in fig. 4 is a graph after filtering the data curve according to the monitored change in the turn-off ratio of the heating element. When the turn-off ratio of the heating element is greater than or equal to D during the rising process1In the meantime, the rotation speed of the high-temperature fan is adjusted to S1(ii) a When the turn-off ratio of the heating element is greater than or equal to D during the rising process2In the meantime, the rotation speed of the high-temperature fan is adjusted to S2(ii) a When the turn-off ratio of the heating element is greater than or equal to D during the rising process3In the meantime, the rotation speed of the high-temperature fan is adjusted to S3(ii) a When the turn-off ratio of the heating element is greater than or equal to D during the rising process4In the meantime, the rotation speed of the high-temperature fan is adjusted to S4(ii) a When the turn-off ratio of the heating element is greater than or equal to D during the rising process5In the meantime, the rotation speed of the high-temperature fan is adjusted to S5。
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 heating 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, monitoring the gas flow of a heating element when the heating element operates at a set loading capacity, and selecting the average value as a maximum threshold value R when the gas flow of the heating element rises to the maximum valuemaxThen, N =5 is taken, i.e. five different thresholds, respectively R1、R2、R3 、R4 、R5Corresponding speeds are respectively S1、S2、S3、S4、S5Wherein R is1=Rmax，R1、R2、R3 、R4 、R5Decrease successively, R5=0.1RmaxThe operator sends R through the human-computer interface1、R2、R3 、R4 、R5And S1、S2、S3、S4、S5Input into the control unit.
After the glass plate enters the heating furnace, the gas flow meter monitors the gas flow of the heating element in real time, because the glass plate enters the heating furnace from a normal temperature state and starts to absorb heat, the temperature in the heating furnace will be reduced at the moment, in order to keep the constant temperature working state of the heating furnace, the heating element will be gradually opened so as to provide more heat, and the gas flow of the heating element is rapidly increased and is constant after rising to a maximum value within a certain time; along with the gradual rise of the temperature of the glass plate, the difference value between the temperature of the glass plate and the temperature in the hearth is gradually reduced, the speed of the glass plate for absorbing 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, and the gas flow of the heating elements tends to be gradually reduced. And when the gas flow meter connected with the heating element monitors that the gas flow of the heating element passes through the maximum value, the rotating speed of the high-temperature fan is adjusted. The graph of fig. 5 is a graph of the monitored gas flow rate of the heating element, followed by filtering the data curve. When the gas flow of the heating element is less than or equal to R in the descending process1In the meantime, the rotation speed of the high-temperature fan is adjusted to S1(ii) a When the gas flow of the heating element is less than or equal to R in the descending process2In the meantime, the rotation speed of the high-temperature fan is adjusted to S2(ii) a When the gas flow of the heating element is less than or equal to R in the descending process3In the meantime, the rotation speed of the high-temperature fan is adjusted to S3(ii) a When the gas flow of the heating element is less than or equal to R in the descending process4In the meantime, the rotation speed of the high-temperature fan is adjusted to S4(ii) a When the gas flow of the heating element is less than or equal to R in the descending process5In time, the rotating speed of the high-temperature fan is adjustedIs as a whole S5。
It should be noted that: rotational speed S of high temperature fan in examples 1 to 51To S5The reduction is merely an example, but the rotation speed of the high temperature fan is not limited to the above embodiment, and the rotation speed of the high temperature fan may be set to be different from the above embodiment in order to meet the heating requirements of different kinds of glass plates.
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 (3)
1. A control method for a glass plate tempering process is characterized by comprising the following steps: defining the maximum value of the working parameter of each heating element of the heating furnace as a maximum threshold value, selecting N different threshold values, wherein the N threshold values are not more than the maximum threshold value, and setting the rotation speed of a high-temperature fan corresponding to the x-th threshold value as Sx, wherein x is more than or equal to 1 and less than or equal to N; after the glass plate enters the heating furnace, the monitoring unit monitors working parameters of the heating element in real time, carries out filtering processing on the working parameters of the heating element, then transmits the working parameters of the heating element after the filtering processing to the control unit, the control unit compares the received working parameters of the heating element with the set N thresholds respectively, when the working parameters of the heating element reach the set x threshold after the maximum value, the control unit sends an instruction to adjust the rotation speed of the high-temperature fan to Sx, the first threshold and the x threshold are sequentially decreased gradually, the first threshold is 0.9-1 time of the maximum threshold, and the last threshold is 0.1-0.2 time of the maximum threshold;
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; defining the maximum value of the total power of the heating elements of each furnace as a maximum threshold value PmaxTaking N different thresholds P1、P2、...PNAnd none of the N different thresholds is greater than PmaxSetting the x-th threshold value P of the N different threshold valuesxCorresponding to the rotating speed S of the high-temperature fanx(ii) a 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, and transmits the total power of the heating element after filtering treatment to the control unit and a set threshold value PxComparing, when the total power of the heating elements is less than or equal to the threshold value P after passing through the maximum valuexWhen the monitoring unit is used, the control unit sends an instruction to adjust the rotation speed of the high-temperature fan to Sx, and the monitoring unit is an electric energy meter;
when the heating element adopts an electric heating element, and the working parameter of the electric heating element is the total current value of the heating element of the heating furnace; defining the maximum value of the total current value of the heating elements of each furnace as a maximum threshold value AmaxTaking N different thresholds A1、A2...ANAnd none of the N different thresholds is greater than AmaxSetting the xth threshold A of the N different thresholdsxCorresponding to the rotating speed S of the high-temperature fanx(ii) a After the glass plate is sent into the heating furnace, the monitoring unit monitors 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 Ax, when the total current value of the heating element is less than or equal to the threshold value Ax after passing through the maximum value, the control unit sends an instruction to adjust the rotation speed of the high-temperature fan to Sx, and the monitoring unit is an ammeter;
when the heating element adopts any one of an electric heating element or a fuel gas heating element, the working parameter is the opening ratio of all the heating elements in the heating furnace, and the opening ratio of the heating elements is the percentage of the number of the heating elements in the working state to the number of all the heating elements; defining the maximum value of the opening ratio of the heating elements of each furnace as a maximum threshold value KmaxTaking N different thresholds K1、K2...KNAnd none of the N different thresholds is greater than KmaxSetting the xth threshold K of the N different thresholdsxCorresponding to the rotating speed S of the high-temperature fanx(ii) a After the glass plate is sent into the heating furnace, the monitoring unit monitors the opening ratio of the heating element in real time and monitors the opening ratio of the heating element obtained by monitoringFiltering, then transmitting the filtered opening ratio into a control unit to be compared with a threshold Kx, when the opening ratio of the heating elements is less than or equal to the threshold Kx after passing through the maximum value, sending an instruction by the control unit, adjusting the rotating speed of the high-temperature fan to be Sx, and after monitoring the number of the heating elements in the working state by a monitoring unit, operating a formula, namely calculating the number of the heating elements in the working state/the total number of the heating elements;
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; defining the maximum value of the turn-off ratio of the heating elements per furnace as a maximum threshold value DmaxTaking N different thresholds D1、D2...DNAnd none of the N different thresholds is greater than DmaxSetting the xth threshold D of the N different thresholdsxCorresponding to the rotating speed S of the high-temperature fanx(ii) a After the glass plate is sent into the heating furnace, the monitoring unit monitors the disconnection ratio of the heating element in real time, the disconnection ratio of the heating element obtained through monitoring is subjected to filtering processing, then the disconnection ratio after filtering processing is transmitted into the control unit and is compared with a threshold Dx, when the disconnection ratio of the heating element is larger than or equal to the threshold Dx after passing through the minimum value, the control unit sends an instruction to adjust the rotation speed of the high-temperature fan to be Sx, and after the disconnection ratio monitors the number of the heating elements in a working state through the monitoring unit, a running formula is obtained by calculating the number of the heating elements in the working state/the total number of the heating elements;
when the heating element adopts a gas heating element and the working parameter of the gas heating element is the gas flow value of the heating element of the heating furnace, the maximum value of the gas flow of the heating element of each furnace is defined as a maximum threshold value RmaxTaking N different thresholds R1、R2...RNAnd none of the N different thresholds is greater than RmaxSetting the x-th threshold R of the N different thresholdsxCorresponding to the rotating speed S of the high-temperature fanX(ii) a 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 of the heating element, then transmits the gas flow value after filtering processing into the control unit to be compared with a set threshold Rx, when the gas flow value of the heating element is smaller than or equal to the threshold Rx after passing through the maximum value, the control unit of the heating furnace sends an instruction to adjust the rotating speed of the high-temperature fan to Sx, and the monitoring unit is a gas flow meter.
2. The tempering process control method according to claim 1, wherein: the threshold value and the corresponding high-temperature fan rotation speed Sx are manually input into the control unit through a human-computer interface.
3. The process of tempering a glass sheet according to claim 1, wherein: the filtering process is digital filtering process or analog filtering process.
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Effective date of registration: 20220829 Address after: Building 1, Northeast Corner of the Intersection of Keji Avenue and Zhuge Street, Yibin District, Luoyang City, Henan Province, 471000 Patentee after: Luoyang Landi Intelligent Technology Co.,Ltd. Address before: 471000 north of the intersection of Keji Avenue and Zhuge Avenue, Yibin District, Luoyang City, Henan Province Patentee before: LUOYANG LANDGLASS TECHNOLOGY Co.,Ltd. |