Hot-pressing curing device for carbon fiber sheet

Abstract

The invention relates to the technical field of curing equipment, in particular to a hot-pressing curing device for a carbon fiber sheet, which comprises a carbon fiber hot-pressing mechanism, a horizontal adjusting mechanism and a pressure self-adaptive mechanism, the carbon fiber hot-pressing mechanism comprises a hot-pressing plate, and a vertically arranged pressure driver is arranged at the top of the hot-pressing plate; the hot pressing plate is provided with a plurality of PTC heaters which are connected in parallel, and each PTC heater is connected with a relay in series; the system further comprises NTC temperature sensors, the NTC temperature sensors are electrically connected with the controller, and the controller is electrically connected with the relay. The horizontal adjusting mechanism is used for adjusting the positions of the pressure driver and the hot pressing plate in the horizontal direction. The pressure self-adaption mechanism comprises a pressure sensor installed at the bottom of the hot pressing plate and further comprises a pressure difference calculation module. Through automatic and mechanical modes, efficient and accurate hot-pressing curing of the semi-hexagonal sheet is achieved, and the problems that in the prior art, hot-pressing curing is low in efficiency, poor in precision, high in labor cost and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of curing equipment technology, and more specifically to a hot-press curing device for carbon fiber sheets. Background Technology

[0002] For example, Chinese invention patent CN116406036A provides a PTC electric heater hot-press curing device, belonging to the category of electric heater manufacturing apparatus. This device includes an operating platform and at least one hot-pressing station set on the operating platform. Each hot-pressing station has a hot-pressing positioning mechanism and also includes multiple hot-pressing clamps for holding the PTC electric heaters. Each hot-pressing clamp can be pressed and fixed by the hot-pressing positioning mechanism, thereby achieving hot-press curing by energizing the PTC electric heaters. Its advantages lie in its ingenious structural design. Not only can it reliably clamp and position the PTC electric heaters using dedicated hot-pressing clamps before hot-press curing, but it also ensures the stability and reliability of the entire hot-press curing operation through the hot-pressing positioning mechanism during the hot-press curing process, greatly improving the quality of hot-press curing. During the hot-press curing process, only each PTC electric heater needs to be energized, making the operation very convenient. Furthermore, multiple PTC electric heaters... The simultaneous processing of PTC electric heaters further improves work efficiency; however, this equipment has the following drawbacks: First, due to its simple structural design, the device lacks a precise adjustment and control mechanism, making it difficult to guarantee the curing quality of each electric heater during the hot-press curing process. This may result in incomplete or uneven curing, affecting the product's lifespan. Second, the equipment may lack sufficient adjustment mechanisms, making it difficult to accurately adjust and adapt to different specifications or sizes of PTC electric heaters. This may limit the equipment's application range and reduce its versatility and flexibility. Due to inconvenient adjustment and potential accuracy issues, the equipment may require more manual intervention and inspection during production, which will reduce production efficiency and increase labor costs. In summary, this equipment has significant technical shortcomings in terms of adjustment flexibility, curing accuracy, curing quality, maintenance, and production efficiency.

[0003] For example, Chinese invention patent CN110978615A provides a thermosetting curing device for corrugated cardboard boxes, belonging to the technical field of corrugated cardboard box processing equipment. This device includes a base and a heating plate. Universal wheels are fixedly installed at the four corners of the base, and matching brake pads are fixedly installed on the universal wheels. Guide rods are fixedly connected to the four corners of the upper surface of the base. The other ends of the four guide rods are fixedly connected to a top plate. A hydraulic cylinder is fixedly installed on the upper surface of the top plate. The piston rod of the hydraulic cylinder passes through the top plate and is fixedly connected to a U-shaped frame. A lower pressure plate is fixedly connected to the bottom end of the U-shaped frame. Guide sleeves matching the guide rods are fixedly embedded at the four corners of the lower pressure plate. The guide rods pass through the guide sleeves, and the guide sleeves are slidably connected to the guide rods. During operation, the hydraulic cylinder is activated to drive the lower pressure plate connected to the U-shaped frame to descend, simultaneously causing the guide sleeves to slide along the guide rods, ensuring the smooth movement of the lower pressure plate. The heating plate on the lower pressure plate facilitates the thermosetting curing of the corrugated cardboard boxes on the upper surface of the base. The process involves pulling up the lever to separate the positioning rod from the positioning groove on the heating plate, then pulling the heating plate to slide the guide block along the guide groove on the strip plate. Once the guide block separates from the guide groove, the heating plate can be quickly removed. Its advantage lies in the fact that this corrugated cardboard box thermoforming device allows for quick assembly and disassembly of the heating plate as needed, and also prevents the corrugated cardboard box from shifting during thermoforming, thus ensuring the thermoforming effect. However, the heating plate of this device is simply connected to the groove by a lever, resulting in poor stability. Furthermore, during installation, two push rods need to be pushed simultaneously to overcome the tension of the first spring, requiring another person to install the heating plate, making it inconvenient for a single person. This patent also lacks an anti-shift function, meaning the corrugated cardboard box is prone to shifting during thermoforming, affecting the thermoforming effect. In summary, this device has significant technical shortcomings in terms of heating plate stability and anti-shift function.

[0004] For example Figure 3 As shown, during the stacking process of the semi-hexagonal sheet, the lateral positions of each two adjacent sheets will be slightly different. Therefore, a hot pressing device is required to perform an offset operation and then hot press again. Furthermore, due to the special shape of the sheet, uneven pressure on the upper surface of the sheet is easy to cause unstable curing.

[0005] Therefore, in view of the above problems, the present invention urgently needs to provide a hot-press curing device for carbon fiber sheets. Summary of the Invention

[0006] The technical problem solved by this invention is to provide a hot-press curing device for carbon fiber sheets, which achieves efficient and precise hot-press curing of semi-hexagonal sheets through automation and mechanization, thus solving the problems of low efficiency, poor precision and high labor costs in the existing hot-press curing technology.

[0007] The present invention provides a hot-press curing device for carbon fiber sheets, including a carbon fiber hot-pressing mechanism, a horizontal adjustment mechanism and a pressure adaptive mechanism; wherein, the carbon fiber hot-pressing mechanism includes a hot-pressing plate that matches the shape and size of the carbon fiber sheet, and a vertically arranged pressure actuator is provided above the hot-pressing plate.

[0008] The hot press plate contains multiple PTC heaters connected in parallel, and each PTC heater is connected in series with a relay for controlling the voltage of each PTC heater;

[0009] NTC temperature sensors are used to collect the temperature of each PTC heater.

[0010] The temperature difference calculation module is used to calculate the difference between the temperature of each PTC heater and the set temperature;

[0011] The horizontal adjustment mechanism is installed between the pressure actuator and the hot platen, and is used to adjust the position of the hot platen laterally;

[0012] The pressure adaptive mechanism includes a pressure sensor mounted on the lower surface of the hot press plate for collecting the pressure value between the lower surface of the hot press plate and the carbon fiber sheet;

[0013] The pressure difference calculation module is used to calculate the difference between the pressure between the lower surface of the hot press plate and the carbon fiber sheet and the set pressure.

[0014] The controller is used to control each relay to adjust the voltage of the corresponding PTC heater based on the temperature difference between the temperature of each PTC heater and the set temperature value; it is also used to perform sliding mode control on the output pressure of the pressure drive based on the actual temperature of each PTC heater, so as to realize the pressure between the lower plate of the hot press plate and the carbon fiber sheet converges to the set pressure.

[0015] Preferably, the controller includes a sliding mode control module and a sliding mode variable calculation module. The pressure difference calculation module is electrically connected to the sliding mode control module, the sliding mode variable calculation module is electrically connected to the sliding mode control module, and the sliding mode control module is electrically connected to the controller. The pressure difference value of the pressure difference calculation module and the temperature value collected by the NTC temperature sensor are input to the sliding mode variable calculation module. The sliding mode variable output by the sliding mode variable calculation module is input to the sliding mode control module. The control voltage output by the sliding mode control module is input to the pressure driver (2).

[0016] Preferably, the sliding mode control module selects a sliding surface where the error between the set pressure sensor value and the set pressure value is 0. The calculation formula for the sliding surface is:

[0017] s = c*e + de / dt

[0018] Where c is the adjustment constant, e is the error between the pressure sensor value and the set pressure value, and de / dt is the error change rate.

[0019] Preferably, the horizontal adjustment mechanism includes a horizontally arranged Y-axis slide rail fixedly connected to the moving end of the pressure actuator, and the top end of the hot press plate fixedly connected to the moving part of the Y-axis slide rail; it also includes an adjustment mechanism for adjusting the position of the hot press plate along the Y-axis slide rail.

[0020] Preferably, it further includes a longitudinal adjustment mechanism, which includes a mounting bracket fixedly connected to the pressure actuator. The mounting bracket has a base at its lower end, and an X-axis slide rail that is perpendicular to the horizontal adjustment mechanism is provided at its top end. The lower surface of the mounting bracket is fixedly connected to the moving part of the X-axis slide rail.

[0021] Preferably, an X-axis drive device is provided on one side of the mounting bracket at intervals, and the moving end of the X-axis drive device is fixedly connected to the mounting bracket to push the mounting bracket to move along the X-axis slide rail.

[0022] Preferably, the pressure sensor is a strain gauge or a piezoelectric sensor, and multiple pressure sensors are installed at intervals on the lower surface of the hot press plate.

[0023] Preferably, a copper heat-conducting block is also installed on the lower surface of the hot press plate.

[0024] Preferably, the lower surface of the hot press plate is in the form of a series of connected semi-hexagonal grooves.

[0025] Preferably, the mounting bracket is also equipped with a lifting module. A hot-press lifting back plate is horizontally mounted on the moving part of the lifting module. The pressure actuator is fixedly mounted on the hot-press lifting back plate. The power end of the pressure actuator passes downward through the hot-press lifting back plate and is fixedly connected to the Y-axis slide rail. The pressure actuator is a cylinder and is also equipped with a pressure regulating valve, a precision pressure regulating valve and an independent backup air source.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] This invention provides a thermosetting curing device for carbon fiber sheets. Through automation and mechanization, it achieves efficient and precise thermosetting curing of carbon fiber sheets, improving both the efficiency and quality of thermosetting curing and reducing the complexity and errors of manual operation. It also enhances the overall performance of the product, meeting the growing market demand. By introducing advanced mechanical automation technology and control strategies, the thermosetting curing process is optimized and innovated, allowing for flexible adjustments during the production of different product models, ensuring the stability and consistency of the thermosetting process. After the semi-hexagonal sheet staggered stacking device completes the positioning and forming of the semi-hexagonal sheet, the pressure actuator drives the hot press plate to descend and thermoset the semi-hexagonal sheet. The pressure actuator uses pneumatic pressure and includes a pressure regulating valve, a precision pressure regulating valve, and an independent backup air source to ensure that if the external air source malfunctions, it will not affect the quality of the current product in a short period of time. The horizontal adjustment mechanism can automatically move the position of the pressure actuator and the hot press plate during normal operation, ensuring that the lower surface of the hot press plate aligns with the staggered semi-hexagonal sheets. The hexagonal sheets are aligned, and the position of the forming mold is fine-tuned when changing product models to ensure hot pressing accuracy. For the heating device, multiple PTC heaters are connected in parallel, each with an independent temperature sensor to ensure individual control of the heating temperature. Each PTC heater is connected in series with a relay, and the voltage of the PTC heater is dynamically adjusted through IGBT elements, which can disperse heat output, avoid local overheating, and improve the overall heating uniformity. By installing copper heat-conducting blocks at the bottom of the hot press plate, the overall temperature of the hot press plate is made uniform. During the heating process, the pressure change of the hot press plate on the carbon fiber sheet may affect the temperature distribution of the carbon fiber sheet. The sliding mode control algorithm can dynamically coordinate the pressure and temperature control parameters (such as KP / KI / KD in PID) to ensure their coordinated stability. The "equivalent control term" of the sliding mode control can offset the nonlinear factors of the system (such as the step change of the PTC resistance), while the "switching control term" ensures that the system state converges to the equilibrium point quickly. Attached Figure Description

[0028] Figure 1 This is a schematic diagram (three-dimensional view) of the hot-press curing device for carbon fiber sheets according to an embodiment of the present invention;

[0029] Figure 2 This is a detailed internal view of the hot-press curing apparatus for carbon fiber sheets described in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram (three-dimensional view) of the semi-hexagonal sheet described in the background art of this invention.

[0031] The components include: 1. Hot press plate; 2. Pressure actuator; 3. Base; 4. X-axis slide rail; 5. Y-axis slide rail; 6. Adjustment mechanism; 7. Lifting module; 8. Hot press lifting back plate; 9. X-axis drive device; 10. Mounting bracket. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1 , Figure 2 As shown, this embodiment provides a hot-press curing device for carbon fiber sheets, including a carbon fiber hot-pressing mechanism, a horizontal adjustment mechanism, and a pressure adaptive mechanism; wherein, the carbon fiber hot-pressing mechanism includes a hot-pressing plate 1 that matches the shape and size of the carbon fiber sheet, and a vertically arranged pressure actuator 2 is provided above the hot-pressing plate 1;

[0034] The hot press plate 1 is equipped with multiple PTC heaters connected in parallel, and each PTC heater is connected in series with a relay for controlling the voltage of each PTC heater;

[0035] NTC temperature sensors are used to collect the temperature of each PTC heater.

[0036] The temperature difference calculation module is used to calculate the difference between the temperature of each PTC heater and the set temperature;

[0037] A horizontal adjustment mechanism is installed between the pressure actuator 2 and the hot plate 1, and is used to adjust the position of the hot plate 1 in the horizontal direction;

[0038] The pressure adaptive mechanism includes a pressure sensor installed on the lower surface of the hot press plate 1, which is used to collect the pressure value between the lower surface of the hot press plate 1 and the carbon fiber sheet.

[0039] The pressure difference calculation module is used to calculate the difference between the pressure between the lower surface of the hot press plate 1 and the carbon fiber sheet and the set pressure.

[0040] The controller is used to control each relay to adjust the voltage of the corresponding PTC heater based on the temperature difference between the temperature of each PTC heater and the set temperature value; it is also used to perform sliding mode control on the output pressure of the pressure drive 2 based on the actual temperature of each PTC heater, so as to realize the pressure between the lower plate of the hot press plate 1 and the carbon fiber sheet converges to the set pressure.

[0041] This invention provides a thermosetting curing device for carbon fiber sheets. Through automation and mechanization, it achieves efficient and precise thermosetting curing of carbon fiber sheets, improving both the efficiency and quality of thermosetting curing and reducing the complexity and errors of manual operation. It also enhances the overall performance of the product, meeting the growing market demand. By introducing advanced mechanical automation technology and control strategies, the thermosetting curing process is optimized and innovated, allowing for flexible adjustments during the production of different product models, ensuring the stability and consistency of the thermosetting process. After the semi-hexagonal sheet staggered stacking device completes the positioning and forming of the semi-hexagonal sheet, the pressure actuator 2 drives the hot press plate 1 to descend and thermoset the semi-hexagonal sheet. The pressure actuator 2 uses pneumatic pressure and contains a pressure stabilizing valve, a precision pressure regulating valve, and an independent backup air source to ensure that if the external air source malfunctions, it will not affect the quality of the current product in a short period of time. The horizontal adjustment mechanism can automatically move the position of the pressure actuator 2 and the hot press plate 1 during normal operation, ensuring that the lower surface of the hot press plate 1 aligns with the staggered stacking device. The alignment of the semi-hexagonal sheets is carefully controlled, and the position of the forming mold is finely adjusted when changing product models to ensure hot pressing accuracy. For the heating device, multiple PTC heaters are connected in parallel, each with an independent temperature sensor to ensure individual control of the heating temperature. Each PTC heater is connected in series with a relay, and the voltage of the PTC heater is dynamically adjusted through IGBT elements, which can disperse heat output, avoid local overheating, and improve the overall heating uniformity. By installing copper heat-conducting blocks at the bottom of the hot press plate 1, the overall temperature of the hot press plate 1 is made uniform. During the heating process, the pressure change of the hot press plate 1 on the carbon fiber sheet may affect the temperature distribution of the carbon fiber sheet. The sliding mode control algorithm can dynamically coordinate the pressure and temperature control parameters (such as KP / KI / KD in PID) to ensure their coordinated stability. The "equivalent control term" of the sliding mode control can offset the nonlinear factors of the system (such as the step change of the PTC resistance), while the "switching control term" ensures that the system state converges to the equilibrium point quickly.

[0042] The temperature control circuit in this invention includes the following steps: An NTC temperature sensor is used as the temperature sensor, and an MCU is used as the controller. The MCU obtains the real-time temperature of each PTC heater through the NTC temperature sensor. When the temperature of the PTC heater is below 50°C, the duty cycle is 96%-98%. When the temperature of the PTC heater reaches above 50°C, PID regulation is initiated, using the deviation between the target temperature and the actual temperature as the control basis. By adjusting the PWM duty cycle, precise control of the PTC core power is achieved. Specifically, an initial 8%- A low duty cycle of 12% is used for startup to avoid inrush current. During temperature regulation, a numerical design with proportional coefficient KP=135, integral KI=0.35, and derivative KD=2050 is adopted, combined with integral limiting (upper limit 6000) and rapid cooling mechanism (duty cycle drops to 0.01% when the temperature reaches 57℃) to reduce overshoot and speed up response. In this invention, the duty cycle is periodically adjusted every 1 second, combined with the positive temperature coefficient characteristics of PTC material, i.e., the resistance increases sharply when the temperature rises, to achieve dynamic balance and avoid uneven heating caused by temperature fluctuations.

[0043] In this embodiment, the controller includes a sliding mode control module and a sliding mode variable calculation module. The pressure difference calculation module is electrically connected to the sliding mode control module, the sliding mode variable calculation module is electrically connected to the sliding mode control module, and the sliding mode control module is electrically connected to the controller. The pressure difference value of the pressure difference calculation module and the temperature value collected by the NTC temperature sensor are input to the sliding mode variable calculation module. The sliding mode variable output by the sliding mode variable calculation module is input to the sliding mode control module. The control voltage output by the sliding mode control module is input to the pressure driver 2.

[0044] In this invention, since the heating process involves the thermal expansion and contraction of materials, pressure changes may affect the temperature distribution. Therefore, a sliding mode algorithm is needed to dynamically coordinate pressure and temperature control parameters (such as KP / KI / KD in PID control) to ensure their stable coordination. During the process, the "equivalent control term" of the sliding mode control can offset nonlinear factors of the system (such as the step change of the PTC resistance), while the "switching control term" ensures that the system state converges quickly to the equilibrium point. Specifically, pressure sensors are placed at the stress points of the hot press plate 1 to monitor pressure changes in real time. The error signal collected by the pressure sensor, i.e., the deviation between the actual pressure and the set value, is input into the sliding mode controller to calculate the required torque adjustment. The pressure output is corrected in real time by a servo motor, which drives mechanical components, such as clamping devices or regulating valves. Combined with the feedback of the actual output torque from the torque sensor, static errors are eliminated. The sliding mode control, through the design of the switching function, quickly approximates the target trajectory and has strong robustness to system parameter changes and external disturbances. It is suitable for pressure uncertainties caused by temperature fluctuations in PTC heating.

[0045] In this embodiment, the sliding mode control module selects a sliding surface where the error between the set pressure sensor value and the set pressure value is 0. The calculation formula for the sliding surface is as follows:

[0046] s = c*e + de / dt

[0047] Where c is the adjustment constant, e is the error between the pressure sensor value and the set pressure value, and de / dt is the error change rate.

[0048] like Figure 1 , Figure 2 As shown, the horizontal adjustment mechanism includes a horizontally arranged Y-axis slide rail 5 fixedly connected to the moving end of the pressure actuator 2, and the top end of the hot press plate 1 fixedly connected to the moving part of the Y-axis slide rail 5; it also includes an adjustment mechanism 6 for adjusting the position of the hot press plate 1 along the Y-axis slide rail 5.

[0049] like Figure 1 , Figure 2 As shown, it also includes a longitudinal adjustment mechanism, which includes a mounting bracket 10 fixedly connected to the pressure actuator 2. A base 3 is provided below the mounting bracket 10, and an X-axis slide rail 4 is provided at the top of the base 3, which is perpendicular to the horizontal adjustment mechanism. The lower surface of the mounting bracket 10 is fixedly connected to the moving part of the X-axis slide rail 4.

[0050] like Figure 1 , Figure 2 As shown, an X-axis drive device 9 is provided on one side of the mounting bracket 10 at intervals. The moving end of the X-axis drive device 9 is fixedly connected to the mounting bracket 10 and is used to push the mounting bracket 10 to move along the X-axis slide rail 4.

[0051] In this invention, an X-axis slide rail 4 is provided above the base 3, and the lower surface of the mounting bracket 10 is fixed to the moving part of the X-axis slide rail 4. A hot-press lifting back plate 8 is provided at intervals above the mounting bracket 10. The hot-press lifting back plate 8 is fixed to the fixed part of the pressure driver 2, that is, the fixed part of the pressure driver 2 is fixed to the mounting bracket 10. The moving part of the pressure driver 2 drives the hot-press plate 1 to move downward to hot-press and cure the carbon fiber sheet. One end of the X-axis driving device 9 is fixed, and the moving end is fixed to the side plate of the mounting bracket 10, pushing the mounting bracket 10 to move along the X-axis slide rail 4. A Y-axis slide rail 5 is fixed to the bottom of the moving end of the pressure driver 2. A hot-press plate 1 is fixed to the moving part of the Y-axis slide rail 5. An adjustment mechanism 6 is provided with one end of the Y-axis slide rail 5, driving the hot-press plate 1 to move along the Y-axis slide rail 5, thereby adjusting the position of the hot-press plate 1.

[0052] In this embodiment, the pressure sensor is a strain gauge or a piezoelectric sensor, and multiple pressure sensors are installed at intervals on the lower surface of the hot press plate 1.

[0053] In this embodiment, a copper heat-conducting block is also installed on the lower surface of the hot press plate 1.

[0054] In this embodiment, the lower surface of the hot press plate 1 is in the form of a series of connected semi-hexagonal grooves.

[0055] like Figure 1 , Figure 2 As shown, the mounting bracket 10 is also equipped with a lifting module 7. A hot-press lifting back plate 8 is horizontally mounted on the moving part of the lifting module 7. The pressure driver 2 is fixedly mounted on the hot-press lifting back plate 8. The power end of the pressure driver 2 passes through the hot-press lifting back plate 8 downward and is fixedly connected to the Y-direction slide rail 5. The pressure driver 2 is a cylinder, and is also equipped with a pressure regulating valve, a precision pressure regulating valve and an independent backup air source inside.

[0056] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A thermosetting curing apparatus for carbon fiber sheets, characterized in that: It includes a carbon fiber hot pressing mechanism, a horizontal adjustment mechanism and a pressure adaptive mechanism; wherein, the carbon fiber hot pressing mechanism includes a hot pressing plate (1) that matches the shape and size of the carbon fiber sheet, and a vertically arranged pressure actuator (2) is provided above the hot pressing plate (1), and the fixing part of the pressure actuator (2) is connected to the base (3). The hot press plate (1) is equipped with multiple parallel PTC heaters, and each PTC heater is connected in series with a relay for controlling the voltage of each PTC heater; NTC temperature sensors are used to collect the temperature of each PTC heater. The temperature difference calculation module is used to calculate the difference between the temperature of each PTC heater and the set temperature; A horizontal adjustment mechanism is installed between the pressure actuator (2) and the hot platen (1) for adjusting the position of the hot platen (1) laterally; The pressure adaptive mechanism includes a pressure sensor installed on the lower surface of the hot press plate (1) for collecting the pressure value between the lower surface of the hot press plate (1) and the carbon fiber sheet; The pressure difference calculation module is used to calculate the difference between the pressure between the lower surface of the hot press plate (1) and the carbon fiber sheet and the set pressure. The controller is used to control each relay to adjust the voltage of the corresponding PTC heater according to the temperature difference between the temperature of each PTC heater and the set temperature value; it is used to perform sliding mode control on the output pressure of the pressure drive (2) according to the actual temperature of each PTC heater, so as to realize the pressure between the lower plate of the hot press plate (1) and the carbon fiber sheet converges to the set pressure.

2. The hot-press curing apparatus for carbon fiber sheets according to claim 1, characterized in that: The controller includes a sliding mode control module and a sliding mode variable calculation module. The pressure difference calculation module is electrically connected to the sliding mode control module, the sliding mode variable calculation module is electrically connected to the sliding mode control module, and the sliding mode control module is electrically connected to the controller. The pressure difference value of the pressure difference calculation module and the temperature value collected by the NTC temperature sensor are input to the sliding mode variable calculation module. The sliding mode variable output by the sliding mode variable calculation module is input to the sliding mode control module. The control voltage output by the sliding mode control module is input to the pressure driver (2).

3. The hot-press curing apparatus for carbon fiber sheets according to claim 2, characterized in that: The sliding mode control module selects a sliding surface where the error between the set pressure sensor value and the set pressure value is 0. The calculation formula for the sliding surface is: s = c*e + de / dt Where c is the adjustment constant, e is the error between the pressure sensor value and the set pressure value, and de / dt is the error change rate.

4. The hot-press curing apparatus for carbon fiber sheets according to claim 3, characterized in that: The horizontal adjustment mechanism includes a horizontally arranged Y-axis slide rail (5) fixedly connected to the moving end of the pressure actuator (2), and the top end of the hot platen (1) fixedly connected to the moving part of the Y-axis slide rail (5); it also includes an adjustment mechanism (6) for adjusting the position of the hot platen (1) along the Y-axis slide rail (5).

5. The hot-press curing apparatus for carbon fiber sheets according to claim 4, characterized in that: It also includes a longitudinal adjustment mechanism, which includes a mounting bracket (10) fixedly connected to the fixed part of the pressure driver (2), and an X-axis slide rail (4) provided at the top of the base (3) and perpendicular to the horizontal adjustment mechanism. The lower surface of the mounting bracket (10) is fixedly connected to the moving part of the X-axis slide rail (4).

6. The hot-press curing apparatus for carbon fiber sheets according to claim 5, characterized in that: An X-axis drive device (9) is provided at intervals on one side of the mounting bracket (10). The moving end of the X-axis drive device (9) is fixedly connected to the mounting bracket (10) and is used to push the mounting bracket (10) to move along the X-axis slide rail (4).

7. The hot-press curing apparatus for carbon fiber sheets according to claim 6, characterized in that: The pressure sensor is a strain gauge or a piezoelectric sensor, and multiple pressure sensors are installed at intervals on the lower surface of the hot press plate (1).

8. The hot-press curing apparatus for carbon fiber sheets according to claim 7, characterized in that: A copper heat-conducting block is also installed on the lower surface of the hot press plate (1).

9. The hot-press curing apparatus for carbon fiber sheets according to claim 8, characterized in that: The lower surface of the hot press plate (1) is a series of connected semi-hexagonal grooves.

10. The hot-press curing apparatus for carbon fiber sheets according to claim 9, characterized in that: The mounting bracket (10) is also equipped with a lifting module (7). A hot-press lifting back plate (8) is horizontally mounted on the moving part of the lifting module (7). The pressure driver (2) is fixedly mounted on the hot-press lifting back plate (8). The power end of the pressure driver (2) passes through the hot-press lifting back plate (8) downward and is fixedly connected to the Y-direction slide rail (5). The pressure driver (2) is a cylinder, and is also equipped with a pressure regulating valve, a precision pressure regulating valve and an independent backup air source.

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