A laminated glass production control method, roller control system and preheating roller

Abstract

The application discloses a kind of laminated glass production control method, roller control system and preheating roller way;The application relates to the technical field of laminated glass preheating pre-pressing machine;The conveying area is controlled to convey board at constant preset speed;And the edge real-time temperature of the board located at the inlet end of the pressing area is detected;According to the edge real-time temperature, the heating power of the preheating area and the pressing area is calculated and controlled, so that the edge real-time temperature is in the neighborhood of the target exhaust temperature.And compare the edge real-time temperature with preset threshold;The application maintains the conveying speed as a constant preset value, which is independent of the heat regulation process.Avoid the path of increasing heating time by reducing speed in traditional methods, eliminate the speed and temperature together pointing to heat superposition, avoid energy input surplus.The application only performs protective intervention on speed in extreme working conditions when the system cooling capacity is exhausted and the edge continues to overheat.

Description

Technical Field

[0001] This invention relates to the field of laminated glass preheating and pre-pressing machine technology, and particularly to a laminated glass production control method, roller control system and preheating roller. Background Technology

[0002] Laminated glass, also known as laminated glass, is a composite safety glass made by bonding two or more layers of glass substrates together with a transparent organic polymer interlayer (such as PVB film) under heat and pressure. The mainstream production process in the industry is the dry film method, and the core process is: cleaning, lamination, preheating roller pressing, and final pressing in an autoclave.

[0003] The preheating roller conveyor, also known as a laminated glass preheating and pre-pressing machine, is a core continuous piece of equipment in the initial pressing process of dry lamination production. The preheating roller conveyor supports the semi-finished glass products after lamination, providing qualified blanks for the subsequent final pressing in the autoclave, and preventing defects such as film displacement, residual bubbles, and edge cracking during the high-pressure process. The preheating roller conveyor is a horizontal, continuous structure, divided into three main functional sections along the glass conveying direction: a conveying zone, a preheating zone, and a pressing zone. The entire process is driven by roller sets to achieve continuous glass movement.

[0004] In the preheating roller conveyor process, especially when problems such as continuous bubbles and edge adhesion occur in the glass after pre-pressing, the logical sequence of traditional control methods is usually: First, reduce the speed and increase the heating time; second, fine-tune the temperature of the pressing zone; third, adjust the gap or pressure of the pressing rollers. The order of the second and third steps can be switched. For example, Chinese invention patents CN118269458A, CN117472127B, and CN116728618A all use sensors and vision systems to monitor parameters such as the temperature, pressure, and roller pressure of the laminated glass semi-finished product, automatically adjusting the roller pressure and length, as well as the pressure and temperature, of the roller pressing equipment. The advantages of this traditional adjustment mode are mainly twofold: first, changes in speed and temperature do not apply additional stress to the glass body; second, using pressure adjustment as the final step maximizes the yield rate and avoids mechanical damage and batch accidents caused by blindly increasing pressure. Traditional control methods also present new problems: whether it's slowing down the heating rate to increase the heating time or fine-tuning the temperature of the pressing zone, the essence is to increase the heat input to the target board, which can easily lead to excess energy. Heat accumulates fastest at the edges of the film and glass, and the edges are the first to enter an excessively viscous flow state, prematurely sealing the board's venting channels. This can easily cause the film edges to soften and seal prematurely. Consequently, air may become trapped inside the board, forming closed, discrete bubbles, or the film may become too fluid, resulting in severe adhesive overflow under pressure, or PVB may decompose, producing insoluble bubbles.

[0005] Therefore, this invention proposes a method for controlling the production of laminated glass, a roller conveyor control system, and a preheating roller conveyor. Summary of the Invention

[0006] To address the contradiction between premature closure of exhaust channels and poor pressing quality caused by the strong coupling of temperature, speed, and pressure sequences and the mismatch between pressure application timing and viscosity state in traditional preheating roller conveyors, and to avoid defects such as bubbles and glue overflow caused by premature closure of exhaust channels due to edge overheating in preheating roller conveyor control, this invention proposes a laminated glass production control method, a roller conveyor control system, and a preheating roller conveyor. The technical solution of this invention is implemented as follows: The first aspect is a method for controlling the production of laminated glass.

[0007] This laminated glass production control method is applied to a preheating roller conveyor, which includes a conveying zone, a preheating zone, and a pressing zone. The method includes: controlling the conveying zone to convey sheet metal at a constant preset speed; detecting the real-time edge temperature of the sheet metal located at the entrance end of the pressing zone; calculating and controlling the heating power of the preheating zone and the pressing zone based on the real-time edge temperature, so that the real-time edge temperature is within the neighborhood of a target exhaust temperature; and comparing the real-time edge temperature with a preset threshold, and based on the comparison result, controlling the roller pressure and / or roller gap of the pressing zone to perform exhaust and pressing on the sheet metal.

[0008] Preferably, the method for calculating and controlling the heating power of the preheating zone and the pressing zone includes: setting a target exhaust temperature as a temperature value that softens the film but does not enter a flow state; and adjusting the heating power of the preheating zone and the pressing zone according to the difference between the real-time edge temperature and the target exhaust temperature, so that the real-time edge temperature is within the neighborhood of the target exhaust temperature.

[0009] Preferably, the method for controlling the roll pressure and / or the roll gap includes: Firstly, normal low pressure: when the real-time temperature of the edge does not enter the vicinity of the target exhaust temperature, the roller pressure and / or the roller gap are controlled to output a first pressure value so that the roller pressure only ensures that the glass and film of the plate are initially bonded, but does not apply a compaction effect to the edge of the plate. Secondly, window pressurization: when the real-time temperature of the edge enters the neighborhood of the target exhaust temperature, the roller pressure and / or the roller gap are controlled to output a second pressure value and continue for a specified duration to perform exhaust and pressing on the board, wherein the second pressure value is higher than the first pressure value; Third, overheating relief: When the real-time temperature of the edge exceeds the edge sealing risk threshold, the roller pressure and / or the roller gap are controlled to output a third pressure value to release the edge sealing area of ​​the board; wherein the third pressure value is lower than the first pressure value.

[0010] Preferably, the method for setting the edge sealing risk threshold includes: setting the edge sealing risk threshold higher than the target exhaust temperature, and setting a preset difference between the two, so as to prevent the overheating and pressure relief state from being mistakenly triggered when the real-time edge temperature fluctuates in the vicinity of the target exhaust temperature; or setting the third pressure value to zero pressure or relying solely on the weight of the roller body.

[0011] Preferably, when the real-time temperature of the edge exceeds the edge sealing risk threshold, the cooling adjustment range of the heating power of the preheating zone and the pressing zone is increased so that the real-time temperature of the edge drops back to below the edge sealing risk threshold more quickly.

[0012] Preferably, the method for controlling the conveying zone to convey the sheet material at a preset speed includes: Firstly, when the heating power of the preheating zone and the pressing zone has reached the cooling limit threshold, and the real-time temperature of the edge continues to exceed the absolute safety limit, the preset speed is temporarily increased. Secondly, when the real-time temperature of the edge is below or falls below the absolute safety limit, the preset speed is restored.

[0013] Secondly, a roller conveyor control system.

[0014] This roller conveyor control system is applied to a preheating roller conveyor device, which includes a conveying zone, a preheating zone, and a pressing zone. The roller conveyor control system includes a controller, a speed loop, a temperature loop, and a pressure loop. The controller controls the speed loop, the temperature loop, and the pressure loop, and executes the laminated glass production control method described above.

[0015] Preferably, the speed circuit, the temperature circuit, and the pressure circuit are processed in parallel, and the controller concurrently executes the input sampling, logic operation, and output instructions of each circuit within the same scan cycle.

[0016] Preferably, the controller configures the speed loop to control the conveying zone to convey the sheet material at a preset speed. The controller configures the temperature loop to use the real-time edge temperature of the sheet material at the inlet end of the pressing zone as a feedback signal to calculate and output a heating power adjustment signal to the heating units in the preheating zone and the pressing zone, so that the real-time edge temperature is within the range of a preset target exhaust temperature. The controller configures the pressure loop to output a control signal to the roller pressure adjustment mechanism and / or roller gap adjustment mechanism in the pressing zone to perform exhaust and pressing on the sheet material.

[0017] Preferably, a signal transmission channel is provided between the pressure circuit and the temperature circuit, and the pressure circuit obtains the real-time temperature of the edge through the signal transmission channel.

[0018] Preferably, the pressure circuit includes a comparison unit, which is used to compare the real-time temperature of the edge with a preset threshold, and trigger the pressure circuit to output different control signals to the roller pressure adjustment mechanism or the roller gap adjustment mechanism according to the comparison result.

[0019] Thirdly, a preheating roller conveyor.

[0020] This preheating roller conveyor is used in the production of laminated glass and employs the roller conveyor control system described above. The preheating roller conveyor includes a conveying zone, a preheating zone, and a pressing zone arranged sequentially along the sheet material conveying direction. The conveying zone is equipped with conveying rollers driven by an actuator to carry and convey the sheet material; the preheating zone is equipped with a heating actuator to radiate or convectively heat the sheet material passing through; and the pressing zone is equipped with a roller pressing mechanism to apply pressure to the sheet material to expel interlayer gases. Specifically, a temperature detection element is installed at the entrance end of the pressing zone of the preheating roller conveyor to collect the edge temperature of the sheet material about to enter the pressing zone in real time.

[0021] Preferably, the speed loop in the roller control system controls the conveying zone to convey the sheet material at a constant preset speed, so that the conveying speed does not participate in the conventional heat regulation, thereby avoiding the superposition of heat from speed and temperature; the temperature loop uses the real-time edge temperature collected by the temperature detection device as a feedback signal to adjust the heating power of the preheating zone and the pressing zone in a closed loop, so that the real-time edge temperature is stably maintained within the preset target exhaust temperature range, so as to ensure that the film is in the softening window for suitable exhaust; the pressure loop dynamically controls the roller pressing mechanism to output different roller pressing or roller gap states based on the comparison result of the real-time edge temperature and the preset threshold, including maintaining normal low pressure to keep the exhaust channel open when the temperature is insufficient, applying window pressure to complete exhaust pressing when the temperature enters the target range, and performing overheat relief to actively release the edge area that has tended to be closed when the temperature is too high.

[0022] Compared with the prior art, the beneficial effects of the present invention are: First, in terms of speed control, this invention maintains the conveying speed at a constant preset value, making it independent of the heat regulation process. This avoids the path of increasing heating time by reducing the speed, as is common in traditional methods, and eliminates the superposition of heat caused by both speed and temperature, thus preventing excessive energy input. This invention only intervenes with the speed protectively under extreme conditions where the system's cooling capacity is exhausted and the edges continue to overheat, transforming speed from a thermal regulation variable into a safety guarantee variable.

[0023] Secondly, in terms of temperature control, the real-time temperature at the edge of the pressing zone inlet is used as a feedback signal, and a preset temperature value corresponding to the softened but not yet fluidized film is used as the setpoint. The heating power is adjusted in a closed loop based on the difference between the two. Unlike traditional methods that monitor ambient or average temperature, this invention directly uses the edge temperature that affects the opening and closing of the exhaust channel as the control object. This changes the target of heating power adjustment from the general pressing temperature to a suitable viscosity to maintain the open exhaust channel, thus achieving precise control of heat input.

[0024] Third, in terms of pressure control, this invention can dynamically switch between three states based on the real-time edge temperature: normal low pressure, window pressurization, and overheat relief. Normal low pressure does not compact the edge, keeping the exhaust channel open during transport. Window pressurization is applied only briefly when the edge temperature is within the suitable viscosity range for exhaust, ensuring that exhaust is completed under optimal conditions. Overheat relief actively reduces pressure when the edge temperature exceeds the edge sealing risk threshold, releasing the edge area that has become closed. This control logic transforms the pressure parameter from the ultimate goal in traditional methods into an active factor for the exhaust channel. In particular, overheat relief addresses the over-stickiness of the board material by releasing pressure, forming a reverse control strategy to unblock the edge. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the principle of the present invention; Figure 2 This is a three-dimensional schematic diagram of the preheating roller conveyor device of the present invention from one perspective; Figure 3 This is a three-dimensional schematic diagram of the preheating roller conveyor device of the present invention from another perspective; Figure 4 This is a three-dimensional schematic diagram of the preheating roller conveyor device of the present invention from another perspective; Figure 5 This is a three-dimensional schematic diagram of the roller pressing mechanism of the present invention; Figure 6 This is a schematic diagram of the electrical control principle of the present invention; Figure 7 This is a schematic diagram of the control timing of the speed loop, temperature loop, and pressure loop within the same scan cycle of controller 5 in Example 2; Figure 8 This is a schematic diagram of the control timing for window pressurization and overheat pressure relief protection actions in Example 2; Figure 9 This is a schematic diagram of the control timing for triggering different working states based on the comparison results of thresholds in Example 2. Figure 10 This is a schematic diagram of the timing relationship of the three-state switching threshold after introducing a preset difference in Example 3; Figure 11 This is a schematic diagram illustrating the correspondence between the three-state pressure switching and the setting of the third pressure value in Example 3; Figure 12 This is a schematic diagram illustrating the synergistic timing relationship between overheating relief and simultaneous enhanced cooling in Example 3; Figure 13 This is a schematic diagram of the control timing for protective intervention in Example 4.

[0026] Figure descriptions: 1. Preheating roller conveyor; 11. Conveying track; 12. Processing section; 121. Preheating zone; 122. Conveying zone; 123. Pressing zone; 13. Heating actuator; 14. Actuating motor; 15. Roller pressing mechanism; 151. Frame; 152. Linear actuator; 153. Abutment component; 16. Temperature detection component; 2. Speed ​​circuit; 3. Pressure circuit; 4. Temperature circuit; 5. Controller; 6. Front-end actuator; 7. Rear-end actuator. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Example 1: In the field of laminated glass production, especially in the preheating roller conveyor system, when problems such as continuous bubbles and weak adhesion at the edges occur in the pre-pressed glass, the traditional control method typically follows a logical sequence: reducing the speed to increase heating time, then fine-tuning the temperature of the pressing zone, and finally adjusting the gap or pressure of the pressure rollers. Whether reducing the speed to increase heating time or fine-tuning the temperature of the pressing zone, the traditional method essentially increases heat input. Heat tends to accumulate at the edges of the film and glass, with the edges being the first to enter an excessively viscous flow state, prematurely closing the venting channels of the sheet and ultimately leading to premature softening and sealing of the film edges. Therefore, to solve the above technical problems, this embodiment must separate the temperature and speed functions: speed is used to ensure basic production capacity and heating time, temperature is used to precisely control the film viscosity, and pressure is used to dynamically open the venting channels.

[0029] Therefore, this embodiment first discloses a roller control system for laminated glass production. For example... Figures 2-5 As shown, the roller control system is applied to the preheating roller device 1, which includes a conveying zone 122, a preheating zone 121 and a pressing zone 123, all three functional zones being located within the processing section 12.

[0030] The functional actuator of the conveying zone 122 is the transport channel 11. The transport channel 11 runs through the entire processing section 12, and its spatial position overlaps with the preheating zone 121 and the pressing zone 123. The transport channel 11 is driven by the actuator motor 14; when the transport channel 11 is in operation, it can carry the target material into and out of the preheating zone 121 and the pressing zone 123.

[0031] The functional actuator of the preheating zone 121 is a heating actuator 13, which is installed in the processing section 12 and its spatial position overlaps with the conveying zone 122. Multiple preheating zones 121 can be set in the processing section 12; preferably, two preheating zones 121 are arranged at the front and rear ends of the pressing zone 123, respectively. The heating actuator 13 can be any electrically heated component such as an electric heating tube, heating wire, hot air blower, or condenser.

[0032] The functional actuator of the pressing zone 123 is a roller pressing mechanism 15, which includes a frame 151, a linear actuator 152, and a contact member 153. The linear actuator 152 is connected to and can drive the contact member 153 to perform roller pressing and / or roller gap adjustment operations toward the sheet metal. The linear actuator 152 is mounted on the frame 151. The frame 151 is installed in the processing section 12, and its spatial position overlaps with the conveying zone 122, preferably located between the two preheating zones 121. The linear actuator 152 can be any electrical component that can output linear motion, such as a servo electric cylinder, hydraulic cylinder, pneumatic cylinder, or linkage mechanism.

[0033] The processing section 12 is equipped with a temperature detection element 16 at its entrance to detect the real-time temperature of the edge. The temperature detection element 16 can be any temperature-sensing component, such as an infrared detector, a temperature sensor, or a CCD industrial vision camera.

[0034] The preheating roller conveyor device 1 also includes a controller 5, such as a PLC controller or an MCU controller. Figure 6 As shown, the controller 5 is communicatively connected to the actuator 14, the linear actuator 152, and the heating actuator 13 via speed loop 2, pressure loop 3, and temperature loop 4, respectively. Speed ​​loop 2 is communicatively connected to the actuator 14, pressure loop 3 is communicatively connected to the linear actuator 152, and temperature loop 4 is communicatively connected to the heating actuator 13 and the temperature sensor 16. Pressure loop 3 contains a comparison unit (such as...). Figure 6 As shown, the comparison unit receives the real-time edge temperature collected by the temperature detection element 16 and compares it with a preset threshold. Speed ​​loop 2, pressure loop 3, and temperature loop 4 are processed in parallel. Within the same scan cycle, the controller concurrently executes the input sampling, logic operations, and output instructions of each loop; there is no strong sequential dependency among the three.

[0035] It is worth noting that the preheating roller conveyor 1 can be further equipped with a front-end actuator 6 and a rear-end actuator 7 to form a complete automated production line for laminated glass. Specifically, the front-end actuator 6 is located at the front end of the preheating roller conveyor 1, i.e., the inlet end of the conveyor 11; the front-end actuator 6 can be one or more of a glass washing and drying machine, a clean laminating table, or a laminating assembly unit. The rear-end actuator 7 is located at the rear end of the preheating roller conveyor 1, i.e., the outlet end of the conveyor 11; the rear-end actuator 7 can be one or more of a transition buffer conveyor, a laminating autoclave, an edge trimming device, or a visual inspection rack.

[0036] It should be noted that the composition features of the preheating roller conveyor device 1 listed above in this embodiment are merely used to illustrate the hardware carrier involved in the technical solution of this invention. Hardware carriers that are not involved in the technical solution of this invention, such as vacuum suction cups, film flattening rollers, and autoclaves, are all prior art, and therefore will not be described in detail in this embodiment.

[0037] In one embodiment of this invention, to address the technical problem of energy excess and premature closure of the side exhaust channel caused by speed-temperature coupling in traditional control methods, the roller conveyor control system of this embodiment configures the speed loop 2, temperature loop 4, and pressure loop 3 through controller 5, enabling each of them to perform independent control functions and work collaboratively. For example... Figure 6As shown, controller 5 outputs a speed control signal to actuator motor 14 via speed loop 2, causing conveyor belt 11 to run at a preset constant speed. In normal production, this preset speed is determined by the production task and basic heating time requirements. Speed ​​loop 2 maintains this constant speed and does not participate in the heat regulation of preheating zone 121 and pressing zone 123. Thus, the speed function and temperature function are decoupled, cutting off the coupling path of increasing heating time by reducing speed in traditional methods. Controller 5 configures temperature loop 4 to use the real-time edge temperature of the board at the inlet end of pressing zone 123 as a feedback signal, calculates and outputs a heating power adjustment signal to the heating units of preheating zone 121 and pressing zone 123, so that the real-time edge temperature is within the neighborhood of the preset target exhaust temperature. Controller 5 configures pressure loop 3 to output control signals to the roller adjustment mechanism and / or roller gap adjustment mechanism of pressing zone 123 to perform exhaust and pressing on the board. Pressure loop 3 includes a comparison unit, which compares the real-time edge temperature with a preset threshold and, based on the comparison result, triggers pressure loop 3 to output different control signals to the roller pressure adjustment mechanism or the roller gap adjustment mechanism. Pressure loop 3 achieves autonomous state judgment based on edge temperature through the comparison unit, eliminating the need for controller 5 to perform conditional judgment calculations in each scan cycle, thus reducing the computational load on controller 5 and improving the real-time performance of pressure response. Through this configuration, speed loop 2, temperature loop 4, and pressure loop 3 each perform independent functions: speed loop 2 maintains a constant conveying speed, ensuring production capacity and basic heating time; temperature loop 4 uses the measured edge temperature to adjust the heating power in a closed loop, precisely controlling the film viscosity; and pressure loop 3 autonomously switches pressure states based on edge temperature, dynamically managing the exhaust channel. The three functions are separated yet work in synergy.

[0038] Specifically, such as Figure 6As shown, controller 5 is electrically connected to the corresponding detection and execution elements through temperature loop 4, pressure loop 3, and speed loop 2, forming three independent signal transmission and power drive channels. Temperature detection element 16 is installed at the inlet of the pressing zone 123. Its weak thermoelectric potential signal is first connected to thermocouple sensor signal conditioner / transmitter T16-1. After cold junction compensation, linearization, and amplification, it is converted into a standard analog temperature detection signal (AO4) and sent to the analog input port of controller 5. Inside controller 5, this signal is split into two paths after passing through the input buffer unit (A4-1): one path is used as a temperature feedback signal (F4-1) and connected to the inverting input of comparator (A01) to perform deviation calculation with the target exhaust temperature setpoint from the setpoint input unit (A11); the calculation result is sent to PID controller (U4-1), and after proportional-integral-derivative calculation, the power adjustment signal (P4-1) is output through power adjustment unit (D4-1). After being processed by the isolation drive and thyristor power controller, the signal controls the conduction angle or heating power of the electric heater (i.e., heating actuator 13) through the main circuit of the contactor (KM13-1) and fuse (F13-1). The other temperature detection signal (AO3) is directly used as the real-time temperature value of the edge and transmitted to the comparison unit of the pressure circuit 3 through the internal data bus of the controller.

[0039] In addition, the input of pressure circuit 3 receives feedback signals from the pressure sensor built into linear actuator 152, as well as stroke limit position signals from limit switch (L152-1). Simultaneously, pressure circuit 3 acquires real-time edge temperature data transmitted from temperature circuit 4 via a signal transmission channel. The comparison unit built into pressure circuit 3 compares this temperature data with preset thresholds (including upper and lower limits of the target exhaust temperature neighborhood and edge sealing risk thresholds) and triggers a state logic judgment. Based on the judgment result, pressure regulator (U3-1) outputs a corresponding control signal (P3-1), which is amplified by servo driver (U152-1) and drives linear actuator 152 to adjust the rolling pressure or gap of pressing zone 123. Limit switch (L152-1) and protective relay contacts are connected in series in the drive circuit to cut off the drive signal when linear actuator 152 exceeds its mechanical travel range, achieving hardware-level safety interlocking.

[0040] In addition, speed loop 2 receives the speed command input signal (SG2-1) from the host computer or operation panel, and the actual motor speed feedback signal (SR2-1) from the rotary encoder / speed sensor (E14-1). After comparison and adjustment calculation of the speed command and feedback signals inside the controller 5, a speed control signal is sent to the frequency converter / servo drive (U2-1) through the digital output port (DO1~DO4). The frequency converter / servo drive (U2-1) adjusts its output frequency or pulse width according to the control signal, driving the three-phase AC / servo motor (M14-1, i.e., actuator motor 14) to operate at a preset speed, thereby driving the conveyor 11 to transport the plate at a constant preset speed. The fault signal of the frequency converter / servo drive (U2-1) is fed back to the status feedback input port (DO7~DO8) of the controller 5 through the fault relay contact (F2-1) for the controller 5 to perform fault diagnosis and alarm processing.

[0041] It is worth noting that the triggering condition for the speed loop involved in this embodiment is as follows: when the controller 5 determines that the output of the temperature loop 4 has reached the cooling limit (e.g., the heating power is lower than the preset lower limit), and the real-time temperature at the edge continuously exceeds the absolute safety limit for a specified confirmation time. The termination condition is as follows: when the real-time temperature at the edge falls back below the absolute safety limit, or the temperature loop leaves the full-load cooling state. After the conditions are met, the controller 5 terminates the intervention and restores the reference speed.

[0042] It is worth noting that the triggering condition for temperature loop 4 in this embodiment is: when the system enters the operating state, the preheating roller conveyor starts conveying. The termination condition is: when the system exits the operating state. The loop continuously performs closed-loop regulation during operation, without any intermediate termination conditions.

[0043] It is worth noting that the triggering and termination conditions of the pressure circuit 3 involved in this embodiment include: Firstly, normal low voltage: This is the default state. Controller 5 has no additional triggering conditions, and the system maintains this output during operation.

[0044] Secondly, the window pressurization trigger condition is that the real-time temperature at the edge enters the set neighborhood of the target exhaust temperature.

[0045] Third, the window pressurization termination condition: the pressurization duration reaches the specified value, or the real-time temperature at the edge leaves the set neighborhood.

[0046] Fourth, the overheating and pressure relief trigger condition: the real-time temperature at the edge exceeds the edge sealing risk threshold.

[0047] Fifth, the overheating and pressure relief termination condition: the real-time temperature at the edge drops below the edge sealing risk threshold.

[0048] It should be noted that the meanings of the independent variable terms involved in this embodiment include: Firstly, the real-time edge temperature refers to the real-time edge temperature of the board material at the entrance of the pressing zone 123, which serves as a feedback signal.

[0049] Secondly, the temperature setpoint refers to the temperature setpoint of the preheating zone 121 and the pressing zone 123, which can be adjusted by the heating tube power program and / or the PID controller program.

[0050] Thirdly, the preset speed refers to the conveying speed of the preheating roller conveyor, which depends on the rotational speed of the actuator motor 14. The specific rotational speed can be adjusted through a frequency converter, speed program / or PID controller program. This preset speed is a baseline value, determined by the production task and basic heating time requirements, and does not participate in heat regulation.

[0051] Fourth, roller pressure / roller gap: refers to the pressure of the pressure roller (referred to as linear actuator 152 in this embodiment) in the preheating roller table / the gap value of the pressure roller. It can be adjusted by controlling the cylinder pressure through an electric proportional valve. The specific adjustment method depends on the selection of the preheating roller table.

[0052] Example 2. In traditional control methods, when operators encounter continuous bubbles or loose adhesion at the edges of the glass after pre-pressing, they sequentially perform a series of operations: slowing down and increasing time, fine-tuning the temperature, and adjusting the pressure. In this sequential adjustment mode, both the reduction in speed and the increase in temperature aim to increase the total heat input. The coupling and superposition of these two actions easily leads to excess energy. Excess heat accumulates fastest at the edges of the sheet, causing the edge film to enter an overly viscous flow state first and prematurely close the exhaust channel, trapping air inside the sheet and forming closed bubbles. The roller control system described in Example 1 provides a hardware foundation for functional decoupling through the independent configuration of speed loop 2, temperature loop 4, and pressure loop 3. This example further discloses a laminated glass production control method based on the above control system.

[0053] like Figure 1 , Figures 6-7As shown, this embodiment provides a specific implementation method: First, the controller 5 controls the conveying zone 122 to convey the board at a constant preset speed through the speed loop 2. This preset speed is predetermined based on the production capacity and basic heating time required for the production task and remains constant throughout the entire production batch. Under normal operating conditions, the speed does not participate in the heat regulation of the preheating zone 121 and the pressing zone 123, that is, the output of the speed loop is unrelated to the adjustment action of the temperature loop. In traditional methods, the operator extends the heating time by reducing the speed, which is essentially sacrificing production capacity for heat compensation. This step locks the speed to a constant value, cutting off the path of slowing down for heating, forcing the heat regulation to be handled entirely independently by the temperature loop, and avoiding the superposition of speed and temperature on the total heat. Second, the controller 5 uses the real-time temperature of the board edge collected by the temperature detection device 16 installed at the inlet end of the pressing zone 123 as a feedback signal. Based on the difference between the real-time edge temperature and the preset target exhaust temperature, the controller calculates and adjusts the heating power of the preheating zone 121 and the pressing zone 123 to stabilize the real-time edge temperature within the neighborhood of the target exhaust temperature. Traditional methods typically use the ambient temperature of the preheating zone or the average temperature of the glass surface as the basis for adjustment. These temperatures cannot accurately reflect the true thermal state of the edge of the sheet material—a critical area most prone to premature closure. This step directly uses the edge temperature at the inlet of the pressing zone as feedback, transforming the control target from heating to pressing temperature into a viscosity window. This window refers to the window that can maintain the edge temperature at which the exhaust channel can be opened, achieving direct control over the opening and closing state of the exhaust channel. Thirdly, the controller 5 compares the real-time edge temperature collected by the temperature sensor 16 with a preset threshold, and controls the roller pressure and / or roller gap of the pressing zone 123 according to the comparison result to perform venting and pressing on the sheet material. In this step, the roller pressure or roller gap is not maintained at a constant value, nor is it manually set by the operator based on experience, but rather dynamically switched according to the real-time edge temperature. When the edge temperature is low and the film has not softened sufficiently, the roller pressure is at a low level, and no compaction is applied to the edge, keeping the venting channel open. When the edge temperature enters the target area suitable for venting, the roller pressure switches to a higher level and continues for a specified duration, completing venting and pressing within this window period. When the edge temperature is too high and there is a risk of edge sealing, the roller pressure is reduced to a minimum to release any possible edge sealing.

[0054] For example, such as Figure 7 As shown: Speed ​​loop 2 maintains a constant preset speed throughout the process, unaffected by changes in temperature or pressure. Temperature loop 4 continuously performs closed-loop regulation, bringing the edge temperature close to and stabilizing at the target exhaust temperature. Pressure loop 3 dynamically switches between normal low pressure and window pressurization based on whether the edge temperature enters the target area. When the edge temperature enters the target area, pressure loop 3 outputs a second pressure value to perform exhaust and compression; when the edge temperature leaves the target area, the pressure loop returns to the first pressure value, maintaining only initial contact without compacting the edge.

[0055] In the edge temperature closed-loop control described above in this embodiment, the controller 5 can use the real-time edge temperature as a feedback signal to calculate and adjust the heating power. Therefore, this embodiment further discloses a preferred implementation method that uses the target exhaust temperature as the setting basis to achieve better heating power adjustment: In traditional control methods, when operators set the preheating zone temperature, they usually use empirical values ​​or the pressing temperature range recommended by the film supplier as the basis. The set temperature value only has a single meaning of "heating degree" and is not related to the opening and closing state of the exhaust channel. When the set temperature is too high, the edge of the board may enter an excessively viscous flow state before entering the pressing zone, and the exhaust channel will close prematurely; when the set temperature is too low, the film is not sufficiently softened, exhaust is insufficient, and weak adhesion occurs. Operators cannot predict the state of the exhaust channel based on the temperature set value and can only rely on trial and error to adjust. The preferred implementation method of this embodiment solves the above problems from two aspects: the setting logic of the target exhaust temperature and the adjustment method of the heating power. In one embodiment, the target exhaust temperature is set to a temperature value that softens the film but does not enter a flow state. This temperature value is determined based on the rheological properties of the film used, specifically selecting a temperature point where the film begins to exhibit initial tack, can adhere to the glass surface for exhaust, but has not yet experienced significant flow, and the edges will not close the exhaust channels due to adhesive flow. Specific detection methods can be found in the literature cited on the last page of this embodiment. Overall, this temperature setting does not rely on conversions to ambient temperature or empirical estimations, but directly uses the physical state of the edge film itself as a reference. Therefore, the target exhaust temperature in this embodiment is not an isolated heating target value, but a process function parameter characterizing the open state of the exhaust channels. The controller 5 uses this temperature value as the adjustment target, essentially locking the viscosity state of the edge film within a window where the exhaust channels can be opened but are not yet closed.

[0056] In a more preferred embodiment, after setting the target exhaust temperature, the controller 5 can further adjust the heating power of the preheating zone 121 and the pressing zone 123 based on the difference between the real-time edge temperature collected by the temperature sensor 16 and the target exhaust temperature. When the real-time edge temperature is lower than the target exhaust temperature, the difference is positive, and the controller 5 increases the heating power to raise the edge temperature and bring it closer to the target exhaust temperature; when the real-time edge temperature is higher than the target exhaust temperature, the difference is negative, and the controller 5 decreases the heating power or increases the cooling output to lower the edge temperature. Figure 8 As shown, the target exhaust temperature T setTogether with its allowable fluctuation range ΔT, it constitutes the target exhaust temperature neighborhood. When the real-time edge temperature is within this neighborhood, it indicates that the film is at a suitable viscosity for exhaust, and the pressure loop triggers the window to pressurize. When the edge temperature deviates from the neighborhood, controller 5 adjusts the heating power according to the direction of the difference to bring it back to the neighborhood. When the edge temperature exceeds the edge sealing risk threshold T... high When this occurs, it indicates a risk of edge sealing, triggering the corresponding overheating and pressure relief protection action. Generally, in traditional methods, operators adjust the heating power based on the ambient temperature of the preheating zone or the average temperature of the glass surface. These temperatures lag and attenuate from the actual temperature of the edge of the sheet, causing the adjustment to fail to reflect changes in the true thermal state of the edge in a timely manner. This embodiment directly uses the difference between the real-time edge temperature and the target exhaust temperature as the adjustment basis, eliminating the spatial misalignment between the temperature detection point and actual control requirements. This allows the heating power adjustment to directly respond to the true thermal state of the edge film, avoiding over-adjustment or under-adjustment caused by signal lag.

[0057] In the roller pressure control described above in this embodiment, the controller 5 compares the real-time edge temperature with a preset threshold and controls the roller pressure and / or roller gap based on the comparison result. The preferred embodiment described above has changed the temperature control scheme from the traditional set temperature value to a viscosity state management method, so that the edge temperature is stabilized within a suitable venting range. However, temperature control alone cannot completely solve the problem of premature edge closure—when the board encounters temperature disturbances or material fluctuations during conveying, the edge temperature may still deviate from the target range and enter an excessively viscous flow state. At this time, if the pressure remains constant, edge closure will be inevitable. In the traditional control method, the pressure parameter is set by the operator based on experience and kept constant during batch production. The operator only manually adjusts the pressure after a quality problem occurs, and the adjustment direction is usually to increase the pressure in order to "push out" air bubbles. This method of pressurizing after the fact will actually exacerbate the closure when the edge has already closed due to overheating, resulting in air bubbles that cannot be discharged or severe glue overflow. Therefore, this embodiment further discloses a preferred implementation of step three, namely, the specific control logic for pressure circuit 3 to perform three-state dynamic switching based on the real-time temperature at the edge: One approach is normal low pressure: when the real-time edge temperature has not yet entered the vicinity of the target exhaust temperature, the controller 5 controls the roller pressing mechanism 15 to output a first pressure value. At this time, the temperature of the film at the edge of the sheet has not yet reached the exhaust window condition for sufficient softening, or has already left that window condition. Normal low pressure causes the abutment 153 to contact the sheet surface with only a light force, ensuring initial bonding between the glass and the film and preventing interlayer slippage during transportation, but without applying a compaction force sufficient to allow the film to flow to the edge of the sheet. The core function of normal low pressure is to maintain the natural openness of the exhaust channel. Before the sheet enters the pressing zone 123 or before the edge temperature reaches a suitable exhaust state, no compaction force is applied to the edge, ensuring that the air inside the sheet always has a path to escape. This differs from the traditional method of maintaining the same pressure value regardless of the edge temperature.

[0058] Another method is window pressurization: when the real-time edge temperature enters the vicinity of the target exhaust temperature, the controller 5 controls the roller pressing mechanism 15 to output a second pressure value and maintain it for a specified duration. At this time, the edge film is in the viscosity window of softened but not yet in a flowing state, possessing the physical conditions for exhaust. The mechanical force applied by the second pressure value drives the abutment 153 to press the sheet material together, squeezing out the residual air between the glass and film interface from the unsealed exhaust channel at the edge, and completing the initial bonding within the pressure duration. The key feature of window pressurization is its trigger-based application method rather than the traditional permanent application method. This is because: pressurization only occurs during the period when the edge temperature falls into the target vicinity, the pressurization duration is limited by a specified duration, and after the timeout, it returns to normal low pressure. This method allows the pressing action to be precisely synchronized with the exhaust window, and the sheet material immediately leaves the pressurized state after the air is exhausted, avoiding edge overpressure and glue overflow that may be caused by continuous pressurization.

[0059] Another approach is overheating pressure relief: when the real-time temperature of the edge exceeds the edge sealing risk threshold, the controller 5 controls the roller pressing mechanism 15 to output a third pressure value. At this time, the edge film has entered an excessively viscous flow state, and a closed area may have formed or is about to form on the edge of the board. The third pressure value is lower than the first pressure value, causing the abutment 153 to release the pressure on the edge of the board. The already formed closed area on the edge reopens due to the removal of external force, and the residual air inside gains an escape channel. Overheating pressure relief is the most significant control strategy in this embodiment that distinguishes it from traditional methods. In traditional methods, when bubble defects are found, the operator usually increases the pressure to try to squeeze out the bubbles, but increasing the pressure when the edge is already closed will only exacerbate the closure. This embodiment adopts a reverse strategy—actively releasing the pressure to release the edge closure and reopen the exhaust channel.

[0060] Furthermore, such as Figure 9As shown, when the temperature is within the target exhaust temperature range, the pressure switches to the second pressure value to perform window pressurization. When the temperature leaves the range but does not exceed the edge sealing risk threshold, the pressure returns to the first pressure value to maintain normal low pressure. When the temperature exceeds the edge sealing risk threshold, the pressure drops to the third pressure value to perform overheat relief. The switching between the three states is triggered entirely by the comparison results of the real-time edge temperature relative to each threshold, requiring no manual intervention or reliance on strong programming logic.

[0061] It should be noted that the relevant terms used in this embodiment are explained as follows: Firstly, the "first pressure value" is the pressure value output under normal low-pressure conditions. It is set based on the minimum clamping force required to ensure the smooth transport of the sheet material on the transport channel 11. This force only keeps the contact part 153 of the roller pressing mechanism 15 in contact with the surface of the sheet material, achieving initial bonding between the glass and the film, but does not apply a compaction force sufficient to allow the adhesive layer to flow to the edge of the sheet material. The specific value can be determined based on the sheet material processing specifications and empirical values.

[0062] Secondly, the "second pressure value" is the pressure value output under the window pressurization state. It is set based on the minimum pressure value sufficient to expel residual air between the glass and film interface and achieve the specified initial tack strength under the film viscosity conditions corresponding to the target exhaust temperature. The second pressure value is higher than the first pressure value.

[0063] Third, the "third pressure value" is the pressure value output under overheating and depressurization conditions. It is set based on the minimum pressure value required for the contact member 153 of the roller pressing mechanism 15 to disengage from the compaction contact with the edge of the plate. The third pressure value is lower than the first pressure value.

[0064] Fourth, the "edge sealing risk threshold" is a critical temperature value that characterizes the edge film of the board having entered an excessively viscous flow state, posing a risk of blocked venting channels. This threshold is higher than the target venting temperature and is determined by the viscous flow characteristics of the film material. For the existing technical basis supporting this parameter, please refer to the above of this embodiment and the last page of this specific implementation method.

[0065] Fifth, the “edge sealing zone of the board” refers to the closed ring formed at the edge of the board when the real-time temperature of the edge exceeds the edge sealing risk threshold. The film in the edge area of ​​the board softens excessively and flows, forming a closed ring that isolates the internal air from the external environment.

[0066] Sixth, the "neighborhood of the target exhaust temperature" refers to an allowable temperature fluctuation range centered on the target exhaust temperature. The upper and lower limits of this range are jointly determined by the steady-state control accuracy of the temperature control loop and the sensitivity of the film viscosity to temperature. When the real-time edge temperature is within this neighborhood, the film's viscosity state meets the exhaust requirements—it has been sufficiently softened to achieve effective exhaust, but has not yet entered an excessively viscous flow state that would cause edge closure.

[0067] Example 3. In Example 2 above, pressure loop 3 can dynamically switch between three states: normal low pressure, window pressurization, and overheat relief, based on the real-time temperature at the edge. In this scheme, the trigger condition for overheat relief is that the real-time temperature at the edge exceeds the edge sealing risk threshold. However, in practical engineering applications, if the above scheme is directly deployed, the following two derivative problems may be encountered: Firstly, when the real-time temperature at the edge fluctuates near the upper limit of the target exhaust temperature range, it may frequently touch the edge sealing risk threshold, leading to the false triggering of the overheating and depressurization state. This causes the pressure to repeatedly jump between window pressurization and overheating depressurization, affecting both the exhaust pressure binding effect and increasing the mechanical wear of the actuators. This problem does not exist in traditional control methods—where the pressure is set by the operator and remains constant, eliminating the issue of false triggering of automatic state switching. However, with the introduction of automatic pressure switching in this solution, how to avoid state oscillations becomes a new technical problem that needs to be solved.

[0068] Secondly, under overheated and depressurized conditions, if the third pressure value remains at a certain level, residual pressure will still exist between the contact element 153 and the edge of the plate, which may not be sufficient to completely release the existing edge seal. Therefore, determining the third pressure value to ensure the depressurization effect is a crucial implementation detail that needs to be clearly defined.

[0069] Therefore, this embodiment discloses two preferred methods that can be implemented independently or in combination to address the above two problems.

[0070] In one embodiment of this invention, the method for setting the edge sealing risk threshold is as follows: the edge sealing risk threshold is higher than the target exhaust temperature, and a preset difference is maintained between the two. This preset difference represents the temperature interval between the edge sealing risk threshold and the upper boundary of the target exhaust temperature's neighborhood; its function is to establish a buffer zone between the suitable exhaust temperature window and the dangerous temperature region where edge sealing risk exists. In traditional control methods, the operator only sets a single preheating temperature or pressing temperature, and there is no coordination design issue between multiple thresholds. After introducing three-state automatic switching in this solution, the trigger boundaries of each state need to be clearly defined; otherwise, the aforementioned false triggering problem will be encountered.

[0071] Specifically, the preset difference is set based on factors including the measurement accuracy of the temperature sensor 16, the steady-state control fluctuation range of the temperature loop, or the sensitivity of the film viscosity to temperature changes. The goal is to ensure that the edge temperature remains within the normal control fluctuation range and does not reach the edge sealing risk threshold. Overheating relief is only triggered when the edge temperature exceeds the target exhaust temperature range due to abnormal operating conditions—such as localized overheating of the heating element and / or abnormally prolonged board dwell time. Figure 10 As shown, the upper bound of the target exhaust temperature neighborhood (T) set +ΔT) and the edge sealing risk threshold (T) riskThere is a preset difference between the pressure loop and the normal operating temperature. During normal control fluctuations, the edge temperature may exceed the upper limit of the adjacent area, but as long as it does not exceed the edge sealing risk threshold, pressure loop 3 will only switch back to normal low pressure via window pressurization and will not enter overheating relief. Overheating relief is only triggered when the edge temperature continues to rise and exceeds the edge sealing risk threshold. This preset difference design eliminates the possibility of state oscillation caused by normal temperature fluctuations, ensuring the stability of automatic three-state switching.

[0072] Preferably, the basis for setting the preset difference can be further replaced by the following two methods: The first preferred method is to set the preset difference as a dynamic value related to the conveying speed. The principle is that the time it takes for the edge of the sheet to travel from entering the preheating zone 121 to reaching the inlet of the pressing zone 123 is determined by the conveying speed. When the conveying speed is low, the sheet stays in the preheating zone 121 for a longer period, increasing the heat absorption at the edge, resulting in a faster temperature rise and a correspondingly larger temperature fluctuation. If the preset difference remains small at this time, the edge temperature is more likely to reach the edge sealing risk threshold during normal fluctuations, increasing the probability of false triggering. Conversely, when the conveying speed is high, the sheet stays for a shorter period, the edge temperature rises more slowly, and the fluctuation is smaller, allowing the preset difference to decrease accordingly, making the system respond more promptly to abnormal temperature rises. Therefore, in this preferred method, the controller 5 dynamically adjusts the preset difference according to the current conveying speed: when the conveying speed is low, the preset difference automatically increases, reserving a wider buffer for temperature fluctuations; when the conveying speed is high, the preset difference automatically decreases, making the triggering of overheating and pressure relief more sensitive. This preferred approach addresses a technical problem not present in traditional control methods. In traditional methods, once the operator manually sets the temperature, no threshold is adjusted based on changes in conveyor speed; speed and temperature protection boundaries are completely independent and unrelated. This solution introduces automatic pressure switching, creating a conflict between stability and responsiveness during state switching—a large difference leads to sluggish response, while a small difference results in oscillations. By linking the preset difference to the conveyor speed, this conflict is resolved: at low speeds, some responsiveness is sacrificed for stability; at high speeds, responsiveness is enhanced with sufficient stability margin. This dynamic coordination mechanism is not revealed in traditional control logic and cannot be manually implemented.

[0073] The second preferred method is to set the preset difference and the third pressure value in a coordinated manner. Specifically, when the preset difference is large, the third pressure value is set to a lower value, preferably zero pressure; when the preset difference is small, the third pressure value can be set based solely on the weight of the roller, or to a value slightly lower than the first pressure value. The magnitude of the preset difference also affects the actual effect of the third pressure value under overheating and depressurization conditions. If the preset difference is set too small, depressurization is triggered before the edge temperature significantly exceeds the target exhaust temperature range. At this time, the fluidity of the edge film is still within a controllable range, and a small depressurization amplitude can release the seal. However, if the preset difference is set too large, the edge temperature has already far exceeded the target exhaust temperature when depressurization is triggered, and the film has deeply entered an over-viscous flow state. In this case, a larger depressurization amplitude—that is, a lower third pressure value—is required to effectively release the edge seal. The beneficial effects of this coordinated setting are as follows: a larger preset difference means that the edge temperature is allowed to rise to a higher level before triggering pressure relief, and the edge sealing may be more severe, requiring a more thorough pressure relief to release it; a smaller preset difference means that the edge temperature is relatively lower when pressure relief is triggered, the sealing is less severe, and moderate pressure relief is sufficient. Through coordinated setting, the pressure relief intensity is matched with the sealing severity, avoiding transport instability caused by excessive pressure relief, and also avoiding the inability to release the sealing due to insufficient pressure relief. This coordinated setting method also lacks a corresponding solution in traditional control methods. In traditional methods, pressure and temperature settings are independent, and there is no matching design based on the temperature threshold difference and the minimum pressure value. This preferred method, through the correlation setting of the two control parameters, achieves a positive correlation between the strength of the fault response and the severity of the fault, improving the accuracy of the overheat pressure relief action.

[0074] In another embodiment of this invention, the third pressure value output under overheating and depressurization conditions is set to zero pressure or solely by the weight of the roller. Zero pressure means that the controller 5 outputs a control signal to the linear actuator 152 through the pressure circuit 3, causing the contact member 153 to completely detach from the contact pressure with the board surface. Relying solely on the weight of the roller means that the linear actuator 152 stops applying active driving force to the contact member 153, allowing the contact member 153 to act on the board surface solely by its own weight. In conventional methods, the pressure is always set to a positive value by the operator, and there is no concept of "actively releasing pressure to zero." The basis for determining the third pressure value as the minimum limit in this preferred method is that when the edge temperature exceeds the edge sealing risk threshold, the edge film of the board has entered an excessively viscous flow state, forming or tending to form an edge closed zone. At this time, any residual pressure greater than zero may maintain the closed state of the closed zone, hindering the reopening of the exhaust channel. By reducing the pressure to zero or relying solely on its own weight, the external force pressing on the edge adhesive layer can be completely relieved, allowing the edge sealing area to release itself without external constraint, thus providing an escape channel for the internal air.

[0075] Specifically, such as Figure 11As shown, P3=0 indicates that the third pressure value is set to zero, and P3' indicates that the third pressure value is set solely by the weight of the roller. Both are optional implementations of the third pressure value, and both are lower than the first pressure value P1 under normal low pressure. The selection of the two forms depends on the hardware configuration of the roller pressing mechanism 15. Their common feature is that the pressure is reduced to the lowest limit sufficient to release the edge seal. At the same time, the selection of the third pressure value can be determined according to the specific structure of the roller pressing mechanism 15. If the linear actuator 152 is a bidirectional drive type (such as a double-acting cylinder or a servo electric cylinder), the third pressure value can be set to zero, that is, the actuator actively retracts to the position where it is no longer in contact with the surface of the plate. If the linear actuator 152 is a unidirectional drive type (such as a single-acting cylinder), the third pressure value can be set solely by the weight of the roller, that is, after the drive air source is cut off, the contact member 153 only lightly touches the surface of the plate by its own weight.

[0076] It should be noted that the two preferred methods described above in this embodiment can be implemented independently or in combination. When implemented in combination, on the one hand, a preset difference is used to prevent overheating and pressure relief from being mistakenly triggered, ensuring the stability of the three-state switching; on the other hand, when the pressure relief conditions are indeed met, the pressure is reduced to zero or relies solely on its own weight to ensure that the edge seal is completely released and the exhaust channel is reliably restored. The two preferred methods improve the technical solution for pressure three-state switching in Embodiment 2 from the two dimensions of the stability of the trigger boundary and the effectiveness of the execution action.

[0077] In this embodiment, the aforementioned preferred method prevents overheating pressure relief from being mistakenly triggered by setting a preset difference, and ensures the pressure relief effect by setting the third pressure value to zero or relying solely on the weight of the roller. However, the above solution still has a derivative problem: in the overheating pressure relief state, pressure circuit 3 has reduced the roller pressure to the minimum, and the closed area at the edge of the plate is released, but the heat source causing the edge closure—overheating at the edge—has not been eliminated. If only the natural heat dissipation of the plate during the conveying process is relied upon, the edge temperature will drop slowly, and the pressure relief state needs to be maintained for a long time. During the pressure relief period, the plate is in a state of no effective pressing, and venting and pressing operations cannot be carried out. If this continues for too long, it will result in a long unpressurized section, affecting the quality of the finished product. In traditional control methods, when the operator or sensor detects overheating, they can usually only reduce the heating power and wait for natural cooling. The cooling rate is limited by the environmental heat dissipation conditions, resulting in a delayed response. Pressure regulation and temperature regulation are executed independently, and there is no coordinated linkage between the two under overheating conditions. This embodiment further discloses a preferred implementation method: while triggering overheating and pressure relief, the cooling adjustment range of the heating power of the preheating zone 121 and the pressing zone 123 is simultaneously increased.

[0078] Specifically, when the real-time edge temperature exceeds the edge sealing risk threshold, the controller 5 executes two parallel actions: the first action reduces the roller pressure to the third pressure value through the pressure circuit 3, performs overheating relief, and releases the sealing area of ​​the board edge; the second action simultaneously sends a command to the temperature circuit 4 to increase the cooling adjustment range of the heating power.

[0079] Furthermore, specific methods to increase the cooling adjustment range may include any one or a combination of the following: temporarily increasing the adjustment coefficient of the temperature loop to produce a greater power reduction under the same temperature difference; directly reducing the heating power to a preset minimum safe value or zero power; or switching the temperature loop from normal adjustment mode to forced cooling mode.

[0080] It is understandable that, such as Figure 12 As shown, when the edge temperature exceeds the edge sealing risk threshold T risk Upon activation, the pressure immediately drops to the third pressure value P3 to release pressure. Simultaneously, the cooling rate of the heating power is significantly increased compared to normal adjustment, and the edge temperature drops at an accelerated rate. Once the edge temperature returns to a safe range, the pressure returns to normal control, and the heating power returns to its normal adjustment range. Compared to simply releasing pressure without increasing the cooling rate, the residence time of the edge temperature in the overheated region is significantly shortened. The core of this mechanism lies in establishing a linkage mechanism between pressure loop 3 and temperature loop 4 under overheating conditions. Overheating pressure release solves the mechanical problem of the sealed exhaust passage—by releasing external force to reopen the sealed area; simultaneous enhanced cooling solves the thermal problem that caused the seal—by rapidly reducing heat input to eliminate the root cause of excessive softening of the edge film. The coordinated execution of both mechanisms ensures that while the edge seal is released, the thermal conditions caused by the seal are rapidly eliminated, allowing the edge exhaust passage to be reliably restored without re-sealing.

[0081] It should be noted that the beneficial effects of this collaborative mechanism also include: Firstly, it shortens the duration of the pressure relief state. If the sheet metal cannot be effectively pressed during the pressure relief period, and the pressure relief time is too long, it will result in a long unpressurized section, affecting the quality of the final product. However, through simultaneous enhanced cooling, the edge temperature quickly moves away from the danger zone, the pressure relief state can be lifted as soon as possible, pressure circuit 3 returns to normal working mode, and the length of the unpressurized section is controlled to a minimum.

[0082] Secondly, since the temperature detection element 16 is installed at the entrance of the pressing zone 123, when the controller 5 detects that the edge temperature exceeds the edge sealing risk threshold, the board material in that high-temperature section is entering or about to enter the pressing zone 123. After increasing the cooling rate, the heating power of the preheating zone 121 and the pressing zone 123 decreases rapidly, and the heat input received by the subsequent board material sections is significantly reduced, and their edge temperature drops at a faster rate than natural heat dissipation.

[0083] It should be noted that "temperature reduction adjustment range" refers to the amount of reduction in heating power performed by controller 5 to bring the edge temperature back to within the target exhaust temperature range when the real-time edge temperature is higher than the target exhaust temperature. In conventional temperature closed-loop regulation, this range is determined by multiplying the difference between the real-time edge temperature and the target exhaust temperature by a preset adjustment coefficient. Increasing the temperature reduction adjustment range means applying an additional cooling amount on top of the conventional adjustment amount, or switching to a preset maximum cooling rate, so that the heating power decreases more rapidly, accelerating the drop in edge temperature.

[0084] Example 4. In the aforementioned example, the speed loop 2 is configured to control the conveying zone 122 to convey the sheet material at a constant preset speed, and the speed does not participate in the heat regulation of the preheating zone 121 and the pressing zone 123. This configuration cuts off the "reducing speed to increase heat" technique in the traditional method, eliminating the superposition effect of speed and temperature on the total heat. However, in actual production, there may be an extreme working condition: when the heating power of the preheating zone 121 and the pressing zone 123 has been adjusted to the cooling limit by the controller 5—that is, the heating power has been reduced to the preset lower limit or the heating output has been completely cut off—the real-time edge temperature detected at the inlet of the pressing zone 123 still continues to exceed a certain safety limit and does not drop. This working condition is usually caused by factors such as abnormal continuous heating of the heating actuator 13, a sudden rise in ambient temperature, or abnormality of the feedback loop of the temperature detection element 16. Under this working condition, the temperature loop 4 has exhausted its entire cooling capacity and cannot suppress the edge temperature by further reducing the heating power. Without intervention, the edges of the sheet will remain in an excessively viscous state, the venting channels will be blocked, and continuous bubble defects will appear in batches of products. In traditional control methods, when the operator observes that the heating power has been reduced to the minimum but the sheet is still overheated, the countermeasures are limited—either stop the machine to troubleshoot the fault, or allow defective products to continue to be produced. Traditional methods do not have a preset automatic intervention mechanism for such extreme operating conditions.

[0085] Therefore, this embodiment discloses a preferred implementation method, which configures a protective intervention function for extreme working conditions for the speed loop 2, as a supplement to, rather than a replacement for, the normal technical solution of "controlling the conveying zone to convey the plate at a constant preset speed".

[0086] Specifically, during the temperature closed-loop regulation process, controller 5 simultaneously monitors two parameters: whether the heating power has reached the cooling limit threshold and whether the real-time edge temperature continuously exceeds the absolute safety limit. When both conditions are met simultaneously and the duration reaches the specified confirmation time, controller 5 determines that the system has entered an extreme overheating condition, and temperature loop 4 can no longer restore temperature control by adjusting the heating power. At this time, the protective intervention of speed loop 2 is triggered. Figure 13As shown, in the initial phase of the time axis, the system is in normal control mode, with heating power fluctuating within the normal adjustment range and conveying speed maintaining a preset baseline value. However, when the edge temperature continuously exceeds the absolute safety limit T... abs Furthermore, the heating power has been reduced to the cooling limit threshold P. min When both conditions are met simultaneously, controller 5 triggers a protective speed increase, temporarily raising the conveying speed to V. base +ΔV. After the speed increase, the temperature at the edge drops rapidly. When it drops below the absolute safety limit, controller 5 resumes the preset speed, and the system returns to normal.

[0087] Furthermore, the specific method of protective intervention is as follows: Controller 5 temporarily increases the preset speed of the conveying zone 122. The increased speed shortens the residence time of the sheet material in the preheating zone 121 and the pressing zone 123, reducing the heat absorbed by the subsequent sheet material sections. Simultaneously, due to the increased speed, the sheet material sections already in the preheating zone 121 can pass through the high-temperature area more quickly, reducing further temperature rise at the edges. The speed increase is a preset value, determined based on the upper limit of the safe operating speed of the equipment and the required cooling rate. During the speed increase, controller 5 continuously monitors the real-time edge temperature. When the real-time edge temperature falls below the absolute safety limit, controller 5 restores the preset speed of the conveying zone 122, and the system returns to normal control. It should be noted that this preferred method does not contradict the normal strategy of "controlling the conveying zone to convey the sheet material at a constant preset speed" in Embodiment 2. This is because the constant speed described in Embodiment 2 means that the speed does not participate in heat regulation under normal operating conditions, which is the normal operating mode of speed loop 2. The acceleration intervention described in this preferred method is only applicable to extreme abnormal conditions where temperature loop 4 has exhausted its cooling capacity and the edge temperature continues to exceed the absolute safety limit. This is a protective action at the system safety level and an unconventional thermal regulation method. The two represent the relationship between normal and abnormal states, together constituting the complete control strategy of speed loop 2.

[0088] Understandably, this preferred method provides the system with a safety barrier independent of the temperature loop. When the temperature loop loses its ability to control the peripheral temperature due to extreme operating conditions, the speed loop intervenes by "sacrificing some production stability for system safety," preventing the continued generation of batch defects. Compared with the shutdown protection method, protective speed-up ensures uninterrupted production, automatically restoring normal conveyor speed after the temperature anomaly is eliminated, thus balancing production continuity and product quality protection.

[0089] It should be noted that the relevant terms in this embodiment have the following meanings: Firstly, the "cooling limit threshold" refers to the minimum heating power or maximum cooling capacity that the temperature circuit 4 can output to the heating actuator 13. When the adjustment amount of the heating power has reached this threshold, it indicates that the cooling capacity of the temperature circuit 4 has been exhausted, and the edge temperature cannot be further reduced by conventional adjustment methods. The cooling limit threshold can be set according to the type of heating actuator 13: if the heating actuator 13 is an electric heating tube, the cooling limit threshold can be set to a certain percentage lower limit of the rated power or zero power; if the heating actuator 13 includes an active cooling element (such as a condenser or air cooler), the cooling limit threshold can be set to the maximum output power of the cooling element.

[0090] Secondly, the "absolute safety limit" refers to the maximum permissible temperature at the edge of the sheet material. Exceeding this value will cause irreversible thermal damage to the film or pose a safety risk to the production line. The absolute safety limit is higher than the aforementioned edge sealing risk threshold, and its setting is based on factors including the film's decomposition temperature, the glass's thermal stress limit, and the production line's heat resistance design parameters.

[0091] Furthermore, based on the specific architecture of the coordinated control of the speed, temperature, and pressure three loops in this embodiment, the setting of the cooling limit threshold and the absolute safety limit can be related to the working state of the pressure loop and the system heat dissipation characteristics, producing a synergistic effect that traditional fixed threshold settings do not possess. Two preferred setting methods are provided below.

[0092] One implementation involves setting the cooling limit threshold as a dynamic value, the value of which is related to the current state of the pressure loop. Specifically, during window pressurization, the heat carried away by the roller pressing mechanism 15 increases, requiring a corresponding increase in heating power to maintain stable edge temperature. If the actual output of the heating power has been adjusted by the controller to the minimum power value required to maintain thermal balance under this state, it is determined that the temperature loop has reached its cooling limit. This minimum power value is the dynamic cooling limit threshold. Specifically, the controller 5 stores a reference minimum power table corresponding to different pressure states, obtained through prior experiments or thermodynamic calculations. When the pressure loop 3 enters window pressurization, the cooling limit threshold automatically switches to the corresponding higher lower limit value; when returning to normal low pressure, the threshold switches back to the normal lower lower limit value.

[0093] Understandably, in traditional methods, the cooling limit of heating power is usually defined as a fixed lower limit (such as 10% of rated power or zero power), regardless of the pressing state of the production line at that moment. The specific technical aspect of this solution lies in the fact that the pressure loop exists in three states: normal low pressure, window pressurization, and overheating pressure relief. In the window pressurization state, the roller pressure increases, and the contact between the roller and the plate is closer, resulting in more heat being carried away through heat conduction, thus increasing the system's heat load. The technical effect of this preferred setting method is that it avoids the misjudgment of "false cooling capacity exhaustion" caused by setting the lower limit of heating power too low under window pressurization conditions. If a fixed threshold is used, when the heating power drops to the fixed lower limit (originally the cooling limit defined under normal low pressure) during window pressurization, the controller may immediately trigger a protective speed increase, even though a slight increase in power could still meet the heat demand for window pressurization. The dynamic threshold allows the cooling limit determination to match the system's heat load in real time, initiating speed intervention only when the required heat for window pressurization is truly unavailable. This ensures the quality of exhaust and pressing, reduces unnecessary speed fluctuations, and further strengthens the non-speed-regulating normal characteristics of the speed loop.

[0094] Another implementation involves setting the absolute safety limit in relation to the cooling adjustment range used during overheating and pressure relief. A larger cooling adjustment range (e.g., switching to forced cooling mode) results in a faster rate of temperature drop at the edges, allowing for a shorter recovery time for the temperature and pressure loops before triggering speed intervention. Therefore, the absolute safety limit can be set relatively high (i.e., closer to the ultimate safe temperature) to fully utilize the forced cooling capacity and reduce the frequency of speed intervention. Conversely, if the cooling adjustment range is small, the absolute safety limit needs to be set relatively low to trigger speed protection earlier and ensure safety. Specifically, controller 5 determines the absolute safety limit based on the currently configured cooling adjustment range parameters (or based on the setting of the third pressure value—better heat dissipation at zero pressure corresponds to a faster cooling rate) through a preset mapping relationship. This mapping relationship can be established based on experimental or simulation data.

[0095] Understandably, in traditional methods, absolute safety limits are typically set as constant values ​​based on film decomposition temperature or safety specifications, without considering the differences in the system's own active cooling capabilities. In this solution, when the edge temperature exceeds the edge sealing risk threshold, the cooling rate is increased simultaneously, meaning the system possesses varying degrees of active forced cooling capability. The magnitude of this cooling capability directly affects the time required for the edge temperature to drop from the edge sealing risk threshold back to the safe zone. The technical effect of this setting method is that the absolute safety limit is no longer an isolated safety parameter, but a protective boundary dynamically matched with the system's active cooling capability. It creates a closed-loop coordination between the protective intervention of the speed loop and the combined cooling capability of the temperature and pressure loops: when the system's own cooling capability is strong, it fully utilizes its capacity, delaying speed intervention; when its own cooling capability is weak, speed intervention intervenes earlier to ensure safety. This adaptive mechanism cannot be achieved through traditional fixed threshold settings or manual judgment, minimizing the frequency of speed intervention and better maintaining the core control objective of constant speed.

[0096] All the above embodiments merely illustrate implementation methods for relevant practical applications of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0097] The cited references used in the above embodiments are as follows: [1]ARAUZMORENOC,PIROIRDK,LORENCEAUE.Extendedtime–temperaturerheologyofpolyvinylbutyral(PVB)[J].RheologicaActa,2022,61(8-9):539-547. [2]PUENTE-CÓRDOVAJG,RENTERÍA-BALTIÉRREZFY,LÓPEZ-WALLEB,etal.DielectricandViscoelasticBehaviorofPolyvinylButyralFilms[J].Polymers,2023,15(24):4725. [3]SCHUSTERM.Determinationofthelinearviscoelasticmaterialbehaviourofinterlayerswithsemi-crystallinestructuresshownbytheexampleofasemi-crystallineionomer[J].GlassStructures&Engineering,2022,7(2):157-171. [4]KNIGHTJ,SALIMH,ELEMAMH,etal.CalibrationofThermalViscoelasticMaterialModelsfortheDynamicResponsesofPVBandSGInterlayerMaterials[Z] / / Polymers.2024.

Claims

1. A method for controlling the production of laminated glass, applied to a preheating roller conveyor device, the preheating roller conveyor device comprising a conveying zone, a preheating zone, and a pressing zone, characterized in that, The laminated glass production control method includes: controlling the conveying zone to convey the sheet metal at a preset speed; and... The real-time temperature of the edge of the plate located at the inlet end of the pressing zone is detected; the heating power of the preheating zone and the pressing zone is calculated and controlled based on the real-time edge temperature to ensure that the real-time edge temperature is within the range of the target exhaust temperature; and, The real-time temperature of the edge is compared with a preset threshold. Based on the comparison result, the roller pressure and / or roller gap of the pressing zone are controlled to perform degassing and pressing on the board.

2. The method for controlling the production of laminated glass according to claim 1, characterized in that: The method for calculating and controlling the heating power of the preheating zone and the pressing zone includes: setting the target exhaust temperature to a temperature value that softens the film of the board but does not enter the flow state; and adjusting the heating power of the preheating zone and the pressing zone according to the difference between the real-time edge temperature and the target exhaust temperature, so that the real-time edge temperature is within the neighborhood of the target exhaust temperature.

3. The method for controlling the production of laminated glass according to claim 1, characterized in that: Methods for controlling the roll pressure and / or the roll gap include: When the real-time temperature of the edge does not enter the neighborhood of the target exhaust temperature, the roller pressure and / or the roller gap are controlled to output a first pressure value so that the roller pressure can bond the glass of the plate to the film, but does not apply a compaction effect to the edge of the plate. When the real-time temperature of the edge enters the neighborhood of the target exhaust temperature, the roller pressure and / or the roller gap are controlled to output a second pressure value and continue for a specified duration to perform exhaust and pressing on the sheet metal, wherein the second pressure value is higher than the first pressure value; When the real-time temperature of the edge exceeds the edge sealing risk threshold, the roller pressure and / or the roller gap are controlled to output a third pressure value to release the edge sealing area of ​​the board; wherein the third pressure value is lower than the first pressure value.

4. The method for controlling the production of laminated glass according to claim 3, characterized in that: The methods for determining whether the real-time temperature of the edge exceeds the edge sealing risk threshold include: Set the edge sealing risk threshold to be higher than the target exhaust temperature, so as to prevent the overheating and pressure relief state from being mistakenly triggered when the real-time edge temperature fluctuates near the target exhaust temperature. Alternatively, the third pressure value can be zero or solely based on the weight of the roller.

5. The method for controlling the production of laminated glass according to claim 4, characterized in that: When the real-time temperature of the edge exceeds the edge sealing risk threshold, the cooling adjustment range of the preheating zone and the pressing zone is increased so that the real-time temperature of the edge drops back to below the edge sealing risk threshold more quickly.

6. The method for controlling the production of laminated glass according to claim 1 or 3, characterized in that: The method for controlling the conveying zone to convey the sheet material at a preset speed includes: When the heating power of the preheating zone and the pressing zone has reached the cooling limit threshold, and the real-time temperature of the edge continues to exceed the absolute safety limit, the preset speed is increased. When the real-time temperature of the edge is below or falls below the absolute safety limit, the preset speed is restored.

7. A roller conveyor control system applied to a preheating roller conveyor device, the preheating roller conveyor device comprising a conveying zone, a preheating zone, and a pressing zone, characterized in that, The roller conveyor control system includes a controller, a speed circuit, a temperature circuit, and a pressure circuit; The controller is communicatively connected to the speed loop, the temperature loop, and the pressure loop to execute the laminated glass production control method as described in any one of claims 1 to 6.

8. The roller conveyor control system according to claim 7, characterized in that: The controller configures the speed loop to control the conveying zone to convey the plate at a preset speed; The controller configures the temperature loop to use the real-time edge temperature of the plate located at the inlet end of the pressing zone as a feedback signal, calculate and output a heating power adjustment signal to the heating unit of the preheating zone and the pressing zone, so that the real-time edge temperature is within the neighborhood of the preset target exhaust temperature. The controller configures the pressure circuit to output control signals to the roller pressure adjustment mechanism and / or roller gap adjustment mechanism of the pressing zone to perform venting and pressing on the sheet material.

9. The roller conveyor control system according to claim 7, characterized in that: The pressure circuit includes a comparison unit, which is used to compare the real-time temperature of the edge with a preset threshold, and trigger the pressure circuit to output different control signals to the roller pressure adjustment mechanism or the roller gap adjustment mechanism according to the comparison result.

10. A preheating roller conveyor for use in the production of laminated glass, characterized in that: The roller conveyor control system described in any one of claims 7 to 9 is adopted.

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