Automatic temperature control system and method for laminated glass autoclave

Abstract

The invention provides an automatic temperature control system and method for a laminated glass autoclave, and relates to the technical field of industrial automatic control systems, the automatic temperature control system comprises a main control subsystem and an output subsystem, and the output subsystem is used for heating the interior of the autoclave. According to the system and the method, a temperature closed-loop automatic control system is adopted, a temperature rise curve is set through an industrial touch screen, and a programmable controller starts a stirring fan and an infrared heating pipe according to a program. The system collects data through a temperature sensor and compares the data with a preset curve, a PID algorithm calculates deviation to adjust a power regulator, heating energy is accurately controlled, and temperature closed-loop control is achieved. According to the method, the temperature control precision and the yield are improved, the energy consumption is reduced, the dependence on artificial experience is reduced, the adaptability and robustness of the system are enhanced, and the productivity and efficiency of equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial automation control systems, in particular to an automatic temperature control system and method for a laminated glass autoclave. Background Art

[0002] The autoclave is the terminal equipment used in the laminated glass production process to achieve a tight bond between the glass and the laminated film. By setting process parameters, including temperature and pressure, the laminated film in the glass interlayer is melted and compressed, followed by rapid cooling and pressure reduction, ultimately achieving laminated glass production. Temperature control accuracy has a significant impact on the softening and shaping of the laminated film in laminated glass.

[0003] In traditional autoclaves, temperature control is achieved by switching solid-state relays on and off. The infrared heating tube operates in two states: full load and zero load. This on-off control method results in complex control logic, high energy consumption, and poor adaptability to operating conditions, reducing the yield of laminated glass. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the background technology and provide an automatic temperature control system and method for a laminated glass autoclave, thereby improving the temperature control accuracy in the autoclave, increasing the yield of laminated glass, reducing energy consumption, and increasing production capacity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic temperature control system for a laminated glass autoclave, comprising: a main control subsystem and an output subsystem, wherein the output subsystem is used to heat the interior of the autoclave, and the main control subsystem is used to control the output subsystem; the output subsystem includes multiple heating modules and feedback modules, wherein the heating modules include infrared heating tubes for heating the interior of the autoclave, and a stirring fan for controlling the heat of the workpiece and uniformizing the heat through airflow; the heating module has a rectangular mounting plate as a base, wherein multiple infrared heating tubes are provided on the surface of the base, and the stirring fan is provided on both sides of the base. The multiple heating modules are distributed in multiple partitions inside the autoclave, thereby achieving multi-point temperature control and thereby improving the temperature control accuracy of the autoclave; the main control subsystem includes a main loop controller and a touch screen, wherein the main loop controller is used to power the infrared heating tubes and the stirring fan, and the touch screen is used to control the on / off of the main loop controller.

[0006] Furthermore, the output subsystem also includes a feedback module, which is composed of a proximal sensor and a distal sensor. The proximal sensor is located on the substrate and is located in the middle of the multiple infrared heating tubes. The distal sensor is located around the substrate and detects towards the side away from the substrate.

[0007] Furthermore, the main control subsystem also includes multiple power regulators, each of which is used to regulate a group of heating modules on the substrate, and to change the luminous intensity of the infrared heating tube by proportionally increasing or decreasing the control voltage applied to the infrared heating tube, thereby changing the heating power.

[0008] Furthermore, the main control subsystem also includes a programmable controller, which is connected to the touch screen through a serial communication interface and receives operation instructions and setting parameters from the touch screen. The programmable controller is connected to the main loop controller through a signal control line and is used to control the opening and closing of the stirring fan and the power regulator. The programmable controller is also connected to the power regulator through a signal control line, and changes the working mode of multiple power regulators by outputting control signals, thereby changing the voltage on the infrared heating tube to achieve power control. The power regulator receives the measurement data of the proximal sensor and the distal sensor through the receiving port.

[0009] Furthermore, an automatic control program for controlling the operation of the autoclave is designed in the programmable controller. The automatic control program analyzes the data obtained by the proximal sensor and the distal sensor obtained by the receiving port, and issues control instructions to control the heating module based on the automatic analysis and judgment. At the same time, the instructions are sent to the touch screen through serial port communication, thereby realizing data sharing.

[0010] Furthermore, the programmable controller includes three working modes: manual mode, semi-automatic mode and fully automatic mode, and all three modes are controlled by the touch screen. In the manual mode, the power of the heating module is controlled by the touch screen. In the semi-automatic mode, the temperature curve is set by the touch screen, and the programmable controller is executed according to the temperature curve. In the fully automatic mode, the signal received by the feedback module is calculated in conjunction with the PID control algorithm to automatically take over the control of the power regulator.

[0011] An automatic temperature control method for a laminated glass autoclave comprises the following steps:

[0012] Step S1: Close the autoclave door, set the autoclave working mode to fully automatic through the touch screen, enter the parameter setting interface to set the process parameters, including the target temperature, target pressure and holding time of each stage;

[0013] Step S2: The autoclave is started to automatically operate. The programmable controller starts the stirring fan and the power regulator in sequence according to the preset control program, and generates a heating curve according to the process parameters set on the touch screen;

[0014] Step S3: The feedback module of each heating zone in the autoclave collects the temperature of the corresponding zone, converts the analog value into a digital value in the programmable controller, subtracts the preset heating curve from the collected actual temperature, and inputs the obtained temperature deviation into the PID control algorithm in the programmable controller to automatically calculate the control signal of the power regulator;

[0015] Step S4: The power regulator receives the control signal from the programmable controller and adjusts the voltage applied to the infrared heating tube, thereby changing the heating energy of the infrared heating tube so that the actual temperature in the autoclave is kept within a small error range with the set temperature rise curve.

[0016] Furthermore, step S2 includes the following steps:

[0017] Step S21: Calculate the initial temperature T0, target temperature Tx and heating time t using the formula / t=K, where K=heating slope;

[0018] Step S22: controlling the heating slope to be within the capability of the infrared heating tube to prevent temperature overshoot caused by excessive heating;

[0019] Step S23: generating a heating curve according to the executed heating slope and the timing period.

[0020] Furthermore, in step S3, each heating module has an independent PID control algorithm, and the PID control parameters are manually adjusted based on the established autoclave temperature control model.

[0021] Furthermore, in step S4, the power regulator control signal output by each PID control algorithm is simultaneously input into the left and right power regulators of the corresponding heating zone, thereby achieving synchronous control of the heating zone and the adjacent heating area.

[0022] The present invention provides an automatic temperature control system and method for a laminated glass autoclave, which has the following beneficial effects:

[0023] The advantage of the present invention is that it adopts a temperature closed-loop automatic control scheme, sets the working mode through an industrial touch screen, sets the production process heating curve, and the programmable controller starts the stirring fan and the infrared heating tube in sequence according to the designed automatic control program. The temperature of each heating zone in the autoclave is collected by a temperature sensor and compared with the set heating curve. The PID control algorithm in the programmable controller calculates the control amount according to the temperature deviation, adjusts the output power of the power regulator, and then changes the heating energy of the infrared heating tube to realize temperature closed-loop control, thereby achieving the purpose of improving temperature control accuracy, reducing energy consumption, and increasing the yield of laminated glass.

[0024] Secondly, the system eliminates the need for human intervention during operation, significantly reducing the reliance of traditional switch control methods on manual adjustment experience. This improves the control method's adaptability to varying operating conditions and external environments, as well as its robustness in temperature control. Furthermore, the proposed method effectively increases the yield rate of laminated glass, reduces power consumption, and enhances equipment production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall system of the present invention.

[0026] Figure 2 It is a schematic diagram of the system application of the present invention.

[0027] Figure 3 It is a schematic structural diagram of the heating module of the present invention.

[0028] Figure 4 Schematic diagram of the temperature curve closed-loop control method of the present invention.

[0029] Figure 5 Schematic diagram of the heating curve of the present invention.

[0030] Figure 6 Schematic diagram of the temperature rise error of the present invention.

[0031] Figure 1-6 In the figure: 1-main control subsystem; 101-main loop controller; 102-touch screen; 103-programmable controller; 104-power regulator; 2-output subsystem; 201-heating module; 201a-infrared heating tube; 201b-stirring fan; 202-feedback module; 202a-proximal sensor; 202b-remote sensor. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0033] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0034] The embodiment of the present application provides an automatic temperature control system and method for a laminated glass autoclave. The automatic temperature control system and method for a laminated glass autoclave can realize a closed-loop temperature automatic control system, set the heating curve through an industrial touch screen, and the programmable controller starts the stirring fan and infrared heating tube according to the program. The system uses a temperature sensor to collect data and compare it with a preset curve. The PID algorithm calculates the deviation to adjust the power regulator, accurately controls the heating energy, and realizes closed-loop temperature control. This method improves the temperature control accuracy and yield rate, reduces energy consumption, reduces dependence on manual experience, enhances the adaptability and robustness of the system, and improves the equipment production capacity and efficiency. The automatic temperature control system and method for a laminated glass autoclave are described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments.

[0035] The present application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] See also Figure 1-6 In this embodiment, an automatic temperature control system for a laminated glass autoclave is provided, comprising: a main control subsystem 1 and an output subsystem 2, wherein the output subsystem 2 is used to heat the interior of the autoclave, and the main control subsystem 1 is used to control the output subsystem 2; the output subsystem 2 comprises a plurality of heating modules 201 and a feedback module 202, wherein the heating module 201 comprises an infrared heating tube 201a for heating the interior of the autoclave, and a stirring fan 201b for controlling the heat of the workpiece and uniformizing the heat through airflow, thereby heating the workpiece. The module 201 is composed of a rectangular mounting plate as a base, with multiple infrared heating tubes 201a installed on the base surface and stirring fans 201b installed on both sides of the base. Multiple groups of heating modules 201 are distributed in multiple partitions inside the autoclave to achieve multi-point temperature control, thereby improving the temperature control accuracy of the autoclave. The main control subsystem 1 includes a main loop controller 101 and a touch screen 102. The main loop controller 101 is used to power the infrared heating tubes 201a and stirring fans 201b, and the touch screen 102 is used to control the opening and closing of the main loop controller 101.

[0037] The main control subsystem 1 works in conjunction with the output subsystem 2, with the latter responsible for heating the interior of the autoclave, while the main control subsystem 1 controls its operation. Specifically, the multiple sets of heating modules 201 and feedback modules 202 in the output subsystem 2 ensure precise control of the autoclave's internal temperature.

[0038] Among them, the output subsystem 2 also includes a feedback module 202, which is composed of a proximal sensor 202a and a distal sensor 202b. The proximal sensor 202a is located on the substrate and is located in the middle of multiple infrared heating tubes 201a. The distal sensor 202b is arranged around the substrate and detects toward the side away from the substrate. This arrangement provides more comprehensive temperature monitoring, helps to adjust the heating strategy in time, and ensures the accuracy and stability of temperature control.

[0039] Among them, the main control subsystem 1 also includes multiple power regulators 104, each power regulator 104 corresponds to a group of heating modules 201 on the substrate for regulation, and is used to change the luminous intensity of the infrared heating tube 201a by proportionally increasing or decreasing the control voltage applied to the infrared heating tube 201a, thereby changing the heating power. The application of the power regulator 104 realizes fine control of the heating process, and can flexibly adjust the heating rate according to actual needs to avoid energy waste, while also improving the yield rate.

[0040] Among them, the main control subsystem 1 also includes a programmable controller 103, which is connected to the touch screen 102 through a serial communication interface and receives operation instructions and setting parameters from the touch screen 102. The programmable controller 103 is connected to the main loop controller 101 through a signal control line, and is used to control the opening and closing of the stirring fan 201b and the power regulator 104. The programmable controller 103 is also connected to the power regulator 104 through a signal control line, and changes the working strips of multiple power regulators 104 by outputting control signals, thereby changing the voltage on the infrared heating tube 201a to achieve power control. The power regulator 104 receives measurement data from the proximal sensor 202a and the distal sensor 202b through the receiving port. The integrated main control subsystem 1 design simplifies the user interface, improves the level of automation, reduces the chance of human error, and supports remote monitoring and diagnosis.

[0041] Among them, an automatic control program for controlling the operation of the autoclave is designed in the programmable controller 103. The automatic control program analyzes the data obtained by the proximal sensor 202a and the distal sensor 202b obtained by the receiving port, and issues control instructions to control the heating module 201 based on the automatic analysis and judgment. At the same time, the instructions are sent to the touch screen 102 through serial communication to realize data sharing. Through the above-mentioned highly automated system, the heating strategy can be dynamically adjusted according to actual conditions, ensuring the consistency and stability of the process, while reducing the dependence on the operator's experience.

[0042] Among them, the programmable controller 103 includes three working modes: manual mode, semi-automatic mode and fully automatic mode. All three modes are controlled by the touch screen 102. In the manual mode, the touch screen 102 controls the power of the heating module 201. In the semi-automatic mode, the temperature curve is set by the touch screen 102, and the programmable controller 103 executes according to the temperature curve. In the fully automatic mode, the signal received by the feedback module 202 is calculated and combined with the PID control algorithm to automatically take over the control of the power regulator 104.

[0043] An automatic temperature control method for a laminated glass autoclave comprises the following steps:

[0044] Step S1: Close the autoclave door, set the autoclave working mode to fully automatic through the touch screen 102, enter the parameter setting interface to set the process parameters, including the target temperature, target pressure and holding time of each stage;

[0045] Step S2: The autoclave is started to automatically operate. The programmable controller 103 starts the stirring fan 201b and the power regulator 104 in sequence according to the preset control program, and generates a heating curve according to the process parameters set on the touch screen 102;

[0046] Step S3: The feedback module 202 of each heating zone in the autoclave collects the temperature of the corresponding zone, converts the analog value into a digital value in the programmable controller 103, and subtracts the preset heating curve from the collected actual temperature. The obtained temperature deviation is input into the PID control algorithm in the programmable controller 103 to automatically calculate the control signal of the power regulator 104.

[0047] Step S4: The power regulator 104 receives the control signal from the programmable controller 103 and adjusts the voltage applied to the infrared heating tube 201a, thereby changing the heating energy of the infrared heating tube 201a so that the actual temperature in the autoclave and the set temperature rise curve remain within a small error range.

[0048] Wherein, step S2 includes the following steps:

[0049] Step S21: Calculate the initial temperature T0, target temperature Tx and heating time t using the formula Tx-T0 / t=K, where K=heating slope;

[0050] Step S22: controlling the heating slope to be within the capacity of the infrared heating tube 201a to prevent temperature overshoot caused by excessive heating;

[0051] Step S23: generating a heating curve according to the executed heating slope and the timing period.

[0052] In step S3, each heating module 201 has an independent PID control algorithm, and the PID control parameters are manually adjusted based on the established autoclave temperature control model.

[0053] Among them, in step S4, the power regulator 104 control signal output by each PID control algorithm is simultaneously input into the left and right power regulators 104 of the corresponding heating zone, thereby realizing synchronous control of the heating zone and the adjacent heating area.

[0054] Through the above process, this technology enables the operating mode to be set via the touch screen 102, setting the production process heating curve. The programmable controller 103 sequentially activates the stirring fan 201b and infrared heating tube 201a according to the designed automatic control program. The feedback module 202 collects the temperature of each heating zone within the autoclave and compares it with the set heating curve. The PID control algorithm within the programmable controller 103 calculates the control variable based on the temperature deviation, adjusts the output power of the power regulator 104, and thus changes the heating energy of the infrared heating tube 201a, achieving closed-loop temperature control, thereby improving temperature control accuracy, reducing energy consumption, and increasing the yield of laminated glass. The proposed method requires no human intervention during operation, greatly reducing the reliance of traditional switch control methods on manual adjustment experience, and improving the control method's adaptability to different operating conditions and external environments, as well as the robustness of temperature control. The proposed method effectively improves the yield of laminated glass, reduces energy consumption, and increases equipment production capacity, and has significant value in the field of electrical automatic control of laminated glass autoclaves.

[0055] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] The above is a detailed introduction to the automatic temperature control system and method for a laminated glass autoclave provided in the embodiments of the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application.

[0057] The description of the above embodiments is only used to help understand the technical solutions and core ideas of this application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An automatic temperature control system for a laminated glass autoclave, characterized in that: include: A main control subsystem (1) and an output subsystem (2), wherein the output subsystem (2) is used to heat the interior of the autoclave, and the main control subsystem (1) is used to control the output subsystem (2); The output subsystem (2) includes multiple groups of heating modules (201) and feedback modules (202), wherein the heating modules (201) include infrared heating tubes (201a) for heating the interior of the autoclave, and stirring fans (201b) for controlling the heat of the workpiece and uniformizing the heat through airflow. The heating module (201) uses a rectangular mounting plate as a base plate, wherein multiple infrared heating tubes (201a) are arranged on the surface of the base plate, and the stirring fans (201b) are arranged on both sides of the base plate. Multiple groups of heating modules (201) are distributed in multiple partitions inside the autoclave, thereby achieving multi-point temperature control and improving the temperature control accuracy of the autoclave. The main control subsystem (1) includes a main loop controller (101) and a touch screen (102). The main loop controller (101) is used to supply power to the infrared heating tube (201a) and the stirring fan (201b), and the touch screen (102) is used to control the opening and closing of the main loop controller (101).

2. The automatic temperature control system for laminated glass autoclave according to claim 1, characterized in that: The output subsystem (2) further includes a feedback module (202), which is composed of a proximal sensor (202a) and a distal sensor (202b). The proximal sensor (202a) is located on the substrate and is located in the middle of the plurality of infrared heating tubes (201a). The distal sensor (202b) is arranged around the substrate and detects towards a side away from the substrate.

3. The automatic temperature control system for laminated glass autoclave according to claim 2, characterized in that: The main control subsystem (1) further comprises a plurality of power regulators (104), each of which is configured to regulate a heating module (201) on a corresponding group of substrates, and is configured to change the luminous intensity of the infrared heating tube (201a) and thereby the heating power by proportionally increasing or decreasing the control voltage applied to the infrared heating tube (201a).

4. The automatic temperature control system for laminated glass autoclave according to claim 3, characterized in that: The main control subsystem (1) further includes a programmable controller (103), which is connected to the touch screen (102) via a serial communication interface and receives operation instructions and setting parameters from the touch screen (102). The programmable controller (103) is connected to the main loop controller (101) via a signal control line and is used to control the opening and closing of the stirring fan (201b) and the power regulator (104). The programmable controller (103) is also connected to the power regulator (104) via a signal control line and changes the working positions of multiple power regulators (104) by outputting control signals, thereby changing the voltage on the infrared heating tube (201a) to achieve power control. The power regulator (104) receives measurement data from the proximal sensor (202a) and the distal sensor (202b) via a receiving port.

5. The automatic temperature control system for laminated glass autoclave according to claim 4, characterized in that: An automatic control program for controlling the operation of the autoclave is designed in the programmable controller (103). The automatic control program analyzes the data obtained by the proximal sensor (202a) and the distal sensor (202b) obtained by the receiving port, and issues control instructions to control the heating module (201) based on the automatic analysis and judgment. At the same time, the instructions are sent to the touch screen (102) through serial port communication, thereby realizing data sharing.

6. The automatic temperature control system for laminated glass autoclave according to claim 5, characterized in that: The programmable controller (103) includes three working modes: manual mode, semi-automatic mode and fully automatic mode, wherein all three modes are controlled by the touch screen (102). In the manual mode, the power of the heating module (201) is controlled by the touch screen (102). In the semi-automatic mode, after the temperature curve is set by the touch screen (102), the programmable controller (103) performs the operation according to the temperature curve. In the fully automatic mode, the signal received by the feedback module (202) is calculated and matched with the PID control algorithm to automatically take over the control of the power regulator (104).

7. An automatic temperature control method for a laminated glass autoclave, characterized in that: The following steps are included: Step S1: close the autoclave door, set the autoclave working mode to fully automatic through the touch screen (102), enter the parameter setting interface to set the process parameters, including the target temperature, target pressure and heat preservation and pressure holding time of each stage; Step S2: The autoclave is started to automatically operate, and the programmable controller (103) starts the stirring fan (201b) and the power regulator (104) in sequence according to the preset control program, and generates a heating curve according to the process parameters set on the touch screen (102); Step S3: The feedback module (202) of each heating zone in the autoclave collects the temperature of the corresponding zone, performs conversion between analog and digital quantities in the programmable controller (103), makes a difference between the preset temperature rise curve and the collected actual temperature, inputs the obtained temperature deviation into the PID control algorithm in the programmable controller (103), and automatically calculates the control signal of the power regulator (104); Step S4: The power regulator (104) receives the control signal from the programmable controller (103), adjusts the voltage applied to the infrared heating tube (201a), and thereby changes the heating energy of the infrared heating tube (201a), so that the actual temperature in the autoclave and the set temperature rise curve are maintained within a small error range.

8. The automatic temperature control method for a laminated glass autoclave according to claim 7, characterized in that: The step S2 comprises the following steps: Step S21: Calculate the initial temperature T0, target temperature Tx and heating time t, using the formula (T x -T0) / t=K calculation, where K=heating slope; Step S22: controlling the heating slope so as to be within the capability of the infrared heating tube (201a) to prevent temperature overshoot caused by excessive heating; Step S23: generating a heating curve according to the executed heating slope and the timing period.

9. The automatic temperature control method for a laminated glass autoclave according to claim 7, characterized in that: In step S3, each heating module (201) has an independent PID control algorithm, and the PID control parameters are manually adjusted based on the established autoclave temperature control model.

10. The automatic temperature control method for a laminated glass autoclave according to claim 9, characterized in that: In step S4, the power regulator (104) control signal output by each PID control algorithm is simultaneously input into the left and right power regulators (104) of the corresponding heating zone, thereby achieving synchronous control of the heating zone and the adjacent heating zone.

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