A hot press control system and a control method of a hot press

Abstract

The present application relates to a kind of hot pressing control system and the control method of hot press, hot pressing control system includes at least two pressing plates, load tray, power supply and controller, at least two pressing plates are oppositely arranged along up-down direction, two pressing plates adjacent to each other can be moved and be pressed, and respectively with the positive and negative electrode of power supply electrically connected;Load tray is located between two pressing plates adjacent to each other, for carrying the material to be pressed, wherein material is built-in conductive foil and at least two temperature measuring pieces;Power supply its positive and negative electrode is respectively electrically connected with two pressing plates adjacent to each other, for output heating current is loaded to the conductive foil by the pressing plate, so that the conductive foil generates Joule heat;Controller is electrically connected with the heating structure, the power supply and the temperature measuring piece.

Description

Technical Field

[0001] This invention relates to the field of hot press technology, and in particular to a hot press control system and a control method for a hot press. Background Technology

[0002] Hot pressing systems are widely used in electronic manufacturing fields such as multilayer printed circuit boards (PCBs), copper-clad laminates, and semiconductor packaging. Their function is to press multiple layers of materials (such as prepreg, copper foil, and insulating layers) into a dense, monolithic structure under high temperature and pressure. During the pressing process, temperature is one of the core process parameters determining the quality of the pressing, directly affecting the resin's flowability and degree of curing, interlayer bonding strength, and the dimensional stability of the final product. Therefore, achieving precise control of the pressing temperature is a key technical challenge in the design and manufacturing of hot pressing systems.

[0003] Currently, traditional hot pressing systems generally employ external heating, where heating elements or plates are installed inside the pressing plate. The pressing plate is heated first, and then the heat is transferred to the material surface via thermal conduction. The heat is then gradually conducted inwards, eventually bringing the entire material to the required process temperature. Simultaneously, temperature sensing elements (such as thermocouples) are placed inside or on the surface of the material. The controller adjusts the output power of the heating structure based on the temperature feedback from these elements, thus achieving closed-loop temperature regulation. This "heat plate heating, heat conduction to material" method has long been used in industry, and is technologically mature and structurally simple.

[0004] However, the aforementioned traditional hot pressing systems have significant technical shortcomings in practical applications. First, because heat needs to be conducted from the pressing plate across the material surface to the interior of the material, the heat conduction path is long and has high thermal inertia, resulting in a limited heating rate and difficulty in meeting the demands of high-efficiency production. Second, there is a significant temperature gradient between the material surface and interior, with the temperature in the central region of the material often lagging behind the surface temperature, causing uneven temperature distribution within the material and affecting the consistency of pressing quality. Third, due to the large heat capacity of the pressing plate itself, when the temperature sensing element reports a temperature deviation requiring adjustment of the heating power, the temperature change of the pressing plate exhibits a significant lag, leading to slow temperature control response, a tendency for temperature overshoot or undershoot, and difficulty in achieving precise temperature control curve tracking.

[0005] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main objective of this invention is to provide a hot pressing control system and a hot press control method, which aims to solve the aforementioned technical problems in the prior art.

[0007] To achieve the above objectives, the present invention provides a hot-pressing control system, the hot-pressing control system comprising: At least two pressing plates are arranged opposite each other in the vertical direction. The two adjacent pressing plates can move relative to each other and press together, and are electrically connected to the positive and negative poles of the power supply respectively. A material tray, located between two adjacent pressing plates, is used to hold the material to be pressed, wherein the material contains conductive foil and at least two temperature measuring elements. The power supply, whose positive and negative terminals are electrically connected to two adjacent pressing plates, is used to output heating current that is applied to the conductive foil through the pressing plates, so that the conductive foil generates Joule heat. The controller is electrically connected to both the power supply and the temperature sensing element, and is configured to: Obtain the current material temperature fed back by the temperature measuring element; The current material temperature is compared with the theoretical temperature value at the corresponding moment in the preset temperature curve, and the current temperature difference is calculated. Based on the current temperature difference, the power supply outputs a corresponding heating current to the conductive foil to adjust the material's heating rate.

[0008] Preferably, in the hot-pressing control system, controlling the power supply to output a corresponding heating current to the conductive foil based on the current temperature difference includes: Calculate the target current value based on the current temperature difference, the preset maximum temperature difference, and the rated maximum current; The calculated target current value is converted into an analog voltage signal and output to the power supply, so that the power supply can convert the received analog voltage signal into a corresponding heating current.

[0009] Preferably, in the thermo-pressing control system, acquiring the current material temperature fed back by the temperature measuring element includes: Obtain the real-time temperature values ​​fed back by each of the aforementioned temperature measuring elements; Determine whether each of the real-time temperature values ​​exceeds a preset normal temperature range to obtain a first determination result; or, determine whether the rate of change of each of the real-time temperature values ​​exceeds a preset flicker threshold to obtain a second determination result. If the first or second judgment result is yes, the corresponding temperature measuring element is determined to be abnormal and the real-time temperature value corresponding to the determined abnormal temperature measuring element is removed. The arithmetic mean of the real-time temperature values ​​of all the temperature measuring devices that were not rejected is taken as the current material temperature.

[0010] Preferably, the hot pressing control system further includes a heating structure installed inside the pressing plate; the heating structure is electrically connected to the controller; and a temperature sensor is provided on the pressing plate for sensing the temperature of the pressing plate. Accordingly, the controller is also configured to: Obtain the real-time surface temperature of the pressing plate; Compare the real-time plate temperature with the current material temperature; When the real-time plate temperature is lower than the current material temperature, the heating structure is activated to heat the pressing plate. When the real-time plate temperature is equal to or greater than the current material temperature, the heating structure is controlled to stop heating.

[0011] Preferably, the hot-pressing control system further includes a hydraulic system, which is electrically connected to the controller and is used to control the pressure between the pressing plates; The controller is also configured to: Obtain the current pressure value output by the current hydraulic system; The current pressure value is compared with the theoretical pressure value at the corresponding moment in the preset pressure curve to calculate the current pressure difference. Based on the calculated current pressure difference, the hydraulic system is controlled to increase or decrease pressure.

[0012] Preferably, the thermo-pressure control system further includes: The housing has a working cavity inside, and a first opening communicating with the working cavity is provided on the side wall of the housing. The first opening is equipped with a first door panel. The at least two pressing plates are housed within the working cavity; A first driving mechanism is disposed on the housing. The first driving mechanism is connected to one of the highest or lowest positions of at least two pressing plates and is used to adjust the spacing between adjacent pressing plates in the vertical direction. The first door panel drive assembly includes a direct drive module connected to the first door panel and a limiting and pressing module acting on the first door panel; The direct drive module is configured to drive the first door panel to perform linear reciprocating motion in the vertical direction to open or close the first opening, and the first door panel has at least an upper limit position when the first opening is closed. The limiting and pressing module is configured to respond to the action of the first door panel moving to the upper limit position, such that the first door panel has a tendency to press against the first opening in a direction perpendicular to its lifting direction.

[0013] Preferably, in the hot pressing control system, the limiting and pressing module includes at least a pair of vertical frame strips distributed on opposite sides of the first door panel, and a linkage structure connecting the vertical frame strips and the housing. The first door panel and the vertical frame strips are slidably fitted together. One end of the linkage structure is hinged to the housing and the other end is hinged to the vertical frame strips. The upper part or top of the vertical frame strip is provided with an upper blocking part. In response to the abutment action between the first door panel and the upper blocking part, the pair of vertical frame strips move upward and closer to the first opening under the drive of the first door panel, so as to close the first door panel and press the first opening.

[0014] To achieve the above objectives, the present invention provides a control method for a hot press, the control method comprising: The current material temperature is obtained from the temperature measuring element, which is located between the materials to be pressed. The current material temperature is compared with the theoretical temperature value at the corresponding moment in the preset temperature curve, and the current temperature difference is calculated. Based on the current temperature difference, the power supply outputs a corresponding heating current to the conductive foil to adjust the material's heating rate.

[0015] To achieve the above objectives, the present invention provides a thermo-pressing control system, comprising: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which enables the at least one processor to perform the control method for the hot press described above.

[0016] To achieve the above objectives, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described control method for a hot press.

[0017] The present invention has at least the following beneficial effects: The hot pressing control system provided by this invention includes at least two pressing plates arranged opposite each other in a vertical direction. The two adjacent pressing plates can move relative to each other and press together. A material tray is disposed between the two adjacent pressing plates to hold the material to be pressed, wherein the material contains conductive foil and at least two temperature measuring elements. A power supply is electrically connected to the two adjacent pressing plates, respectively, to output a heating current that is applied to the conductive foil through the pressing plates, causing the conductive foil to generate Joule heat. A controller is electrically connected to both the power supply and the temperature measuring elements. The controller is configured to: acquire the current material temperature fed back by the temperature measuring elements; compare the current material temperature with the theoretical temperature value at the corresponding moment in a preset temperature curve to calculate the current temperature difference; and, based on the current temperature difference, control the power supply to output a corresponding heating current to the conductive foil to adjust the material's heating rate. In this way, the conductive foil inside the material is used directly as a heating element. The material is self-heated by using the principle of Joule heating generated by current passing through the conductor. The heat is generated from inside the material and conducted outward. Compared with the traditional hot pressing system that conducts heat from the outside to the material through the pressing plate, the heat conduction path is significantly shortened, the temperature gradient between the surface and the inside of the material is eliminated, the internal temperature distribution of the material is more uniform, and the heating rate is greatly improved, which meets the process requirements of high-efficiency production.

[0018] Furthermore, by using at least two temperature sensors embedded inside the material to collect the material temperature in real time, the controller performs anomaly detection and rejection processing on multiple temperature data streams before calculating the effective average value. This effectively avoids temperature misjudgment caused by damage, poor contact, or signal jumps in a single temperature sensor, improving the accuracy of temperature detection and the reliability of system operation. At the same time, the redundant design of multiple temperature sensors ensures that even if some temperature sensors fail, the system can still obtain effective material temperatures and maintain normal operation, enhancing the system's fault tolerance.

[0019] Furthermore, by outputting heating current to the conductive foil through the power supply, the controller dynamically adjusts the magnitude of the heating current according to the real-time temperature difference, thereby achieving precise closed-loop control of the material heating rate. This ensures that the actual temperature change strictly conforms to the preset process temperature curve, resulting in high temperature control accuracy and fast response speed. This effectively avoids the temperature overshoot or undershoot problems caused by large thermal inertia in traditional hot plate heating methods.

[0020] Furthermore, the heating structure of the pressing plate assists in heating by following the material temperature. Heating is started when the temperature of the pressing plate is lower than the material temperature and stopped when the material temperature is reached or exceeded. This effectively prevents the cold pressing plate from absorbing the heat generated by the conductive foil, reduces heat loss, and ensures that most of the electrical energy is used to raise the temperature of the material itself, thereby further improving temperature control accuracy and energy utilization efficiency.

[0021] Furthermore, the controller performs real-time closed-loop pressure regulation of the hydraulic system, compares the current pressure value with the theoretical pressure value at the corresponding moment in the preset pressure curve, and automatically executes pressure increase or decrease actions based on the pressure difference. This ensures that the actual pressure accurately follows the changes in the process pressure curve, ensuring that the material is pressed under the set pressure conditions, thereby improving the consistency of the product's pressing quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the hot-press control system provided by the present invention; Figure 2 The diagram illustrates the control method for the hot press provided by the present invention in a first embodiment; Figure 3 A schematic diagram illustrating the control method for the hot press provided by the present invention in a second embodiment is shown. Figure 4 The diagram illustrates the control method for the hot press provided by the present invention in a third embodiment; Figure 5 The diagram illustrates the control method for the hot press provided by the present invention in the fourth embodiment; Figure 6 The diagram illustrates the control method for the hot press provided by the present invention in the fifth embodiment; Figure 7 The diagram illustrates the control method for the hot press provided by the present invention in the sixth embodiment; Figure 8 This is a three-dimensional structural diagram of the hot pressing equipment provided by the present invention; Figure 9 This is a cross-sectional structural diagram of the hot pressing equipment provided by the present invention; Figure 10 An exploded view of a portion of the structure of the hot pressing device provided by the present invention; Figure 11 A schematic diagram of the supporting components; Figure 12 This is an exploded structural diagram of the third pressing plate; Figure 13 This is a schematic diagram showing the positional relationship between the direct drive module and the limit clamping module. Figure 14 for Figure 13 A schematic diagram of the decomposed structure; Figure 15 This is a structural schematic diagram of another embodiment of the limiting and clamping module; Figure 16 This is a structural diagram of the first door panel; Figure 17 This is a schematic diagram of the internal structure of the press plate; Figure 18 This is an exploded structural diagram of the press plate; Figure 19 This is a schematic diagram of the three-dimensional structure of the plug; Figure 20 A schematic diagram showing the positional relationship between the main liquid channel and the branch channels; Figure 21 This is a schematic diagram showing the positional relationship between the junction box and the pressure plate; Figure 22 This is a schematic diagram showing the positional relationship between the second door panel and the second opening; Figure 23 This is a schematic diagram showing the positional relationship between the second door panel, the second drive mechanism, and the locking mechanism. Figure 24 for Figure 22 Enlarged structural diagram of region A in the middle; Figure 25 A three-dimensional view of part of the locking mechanism; Figure 26 for Figure 25 A schematic diagram of the cross-sectional structure; Figure 27 This is a schematic diagram showing the positional relationship between the first card block and the movable seat; Figure 28 This is a three-dimensional structural diagram of the mounting base; Figure 29 This is a three-dimensional structural diagram of the position detection structure; Figure 30 This is an enlarged schematic diagram of the position detection structure; Figure 31 for Figure 30 A schematic diagram of the cross-sectional structure.

[0023] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0025] In this embodiment of the invention, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] In this embodiment of the invention, the term "multiple" refers to two or more, and other quantifiers are similar.

[0028] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the component itself in the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the embodiments of the present invention to facilitate a better understanding of the invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and various variations and modifications based on the following embodiments. The division of the following embodiments is for ease of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with and referenced by each other without contradiction.

[0030] like Figure 1 As shown, this invention provides a hot pressing control system, which includes a hot press, a heating structure, a power supply 2, and a controller 1. The hot press includes at least two pressing plates and a material carrier tray. The at least two pressing plates are arranged opposite each other in a vertical direction, and the two adjacent pressing plates can move relative to each other and press together, and are electrically connected to the positive and negative terminals of the power supply 2 respectively. The material carrier tray is located between the two adjacent pressing plates and is used to carry the material to be pressed, wherein the material contains conductive foil and at least two temperature measuring elements 3. The power supply 2 is electrically connected to the two adjacent pressing plates respectively, and outputs a heating current that is applied to the conductive foil through the pressing plates, causing the conductive foil to generate Joule heat. The controller 1 is electrically connected to the heating structure, the power supply 2, and the temperature measuring elements 3 respectively.

[0031] Specifically, the positive terminal of power source 2 → wire → upper pressing plate → conductive foil (inside the material) → lower pressing plate → wire → negative terminal of power source 2.

[0032] It also includes the heating structure, which is installed inside the pressing plate and is used to heat the pressing plate. The heating structure is electrically connected to the controller.

[0033] In some embodiments, the power supply 2 also includes a rectifier, which is electrically connected to the controller 1. The controller 1 controls the rectifier to output a corresponding DC heating current by outputting an analog voltage control signal to the rectifier. Of course, in other embodiments, the specific structure of the power supply 2 can be configured according to requirements, as long as it can output the required heating current and apply it to the conductive foil through the pressing plate.

[0034] Figure 2 This illustration shows the process of the control method for the hot press provided by the present invention. This process can be used... Figure 1 The control method for the hot press can be executed by controller 1, or by any other suitable computer device. The control method includes steps S1000 to S3000.

[0035] Step S1000 acquires the current material temperature fed back by the temperature sensing element 3. The temperature sensing element 3 is embedded inside the material; typically, at least two temperature sensing elements 3 are embedded in each material to prevent data loss due to damage or poor contact of a single temperature sensing element 3. The temperature sensing element 3 usually uses a thermocouple to convert the temperature signal into a weak voltage signal. This allows the internal analog signal acquisition module to periodically read these voltage signals, filter them, and perform cold junction compensation before converting them into the actual temperature value. For multiple temperature sensing elements 3, the controller acquires the real-time temperature value fed back by each individual element.

[0036] In some embodiments, the temperature measuring element 3 is a temperature measuring wire stacked in the material, and during the voltage process, two temperature measuring wires are stacked in each stacked package.

[0037] Step S2000 compares the current material temperature with the theoretical temperature value at the corresponding moment in the preset temperature curve and calculates the current temperature difference.

[0038] It should be noted that the current material temperature is compared with the theoretical temperature value at the corresponding moment in the preset temperature curve to determine the magnitude of the deviation. The preset temperature curve can be a "time-temperature" relationship curve stored inside the controller, either a factory setting or preset by a process engineer based on material characteristics and process requirements. The preset temperature curve specifies the theoretical temperature value that the material should reach at each moment during the pressing process.

[0039] Specifically, when the current material temperature corresponds to the first moment t1 of the pressing process, the theoretical temperature value corresponding to moment t1 is found from the preset temperature curve. Then, the current actual material temperature is subtracted from the theoretical temperature value to obtain the current temperature difference.

[0040] The sign and magnitude of the current temperature difference directly reflect the degree of deviation between the actual temperature and the process requirements. A positive difference indicates that the actual temperature is lower than the theoretical temperature, requiring continued heating. A larger positive value signifies a greater lag between the actual temperature and the process requirements, necessitating increased heating power. A negative difference indicates that the actual temperature has exceeded the theoretical temperature, requiring reduced or even stopped heating. A difference close to zero indicates that the actual temperature basically meets the process requirements, requiring only maintenance of the current heating state or minor adjustments. This comparison calculation process is repeated in each control cycle to ensure the controller always has real-time temperature deviation information, thus enabling it to operate in a direction that eliminates the deviation.

[0041] In step S3000, based on the current temperature difference, the power supply 2 is controlled to output the corresponding heating current to the conductive foil to adjust the heating rate of the material.

[0042] It should be noted that, based on the current temperature difference, the control power supply 2 outputs the corresponding heating current to the conductive foil. This is the execution step that converts the temperature deviation into actual heating action. The heating current is dynamically adjusted according to the current temperature difference to control the heating rate.

[0043] The larger the current temperature difference, the more the actual temperature lags behind the process requirements, requiring a larger heating current to catch up quickly; the smaller the current temperature difference, the closer it is to the target, requiring a reduction in heating current to avoid overshoot; if the current temperature difference is zero or negative, the target current is set to zero, and heating is stopped.

[0044] After calculating the heating current, it needs to be converted into a signal that power supply 2 can recognize. The target current value is proportionally converted into an analog voltage signal of 0~10V and sent to the control terminal of power supply 2 through the analog output port. After receiving the voltage signal, power supply 2 adjusts the conduction angle of its internal power devices (such as thyristors) according to the voltage value, thereby converting the input three-phase AC power into a corresponding DC heating current, and outputting this current from its DC output terminal. The larger the voltage signal, the larger the DC current output by power supply 2, and the two have a linear correlation.

[0045] The heating current output from power supply 2 is transmitted via wires to two adjacent pressing plates (upper and lower pressing plates). Since the upper and lower pressing plates are electrically connected to the positive and negative terminals of the power supply, respectively, and form electrical contact with the conductive foil embedded in the material, the current naturally flows through the conductive foil, forming a complete current loop. The conductive foil itself has internal resistance; when a large current passes through, according to Joule's law, electrical energy is converted into Joule heat. Heat is generated from within the material and conducted outwards, thereby raising the temperature of the material.

[0046] Figure 3The diagram illustrates the control method for the hot press provided by the present invention in a second embodiment. Step S3000 includes steps S3100 and S3200.

[0047] Step S3100 calculates the target current value based on the current temperature difference, the preset maximum temperature difference, and the rated maximum current. It should be noted that the preset maximum temperature difference and rated maximum current can be factory settings or preset in advance. The preset maximum temperature difference typically reflects the maximum identifiable temperature deviation range. The rated maximum current is the maximum heating current that power supply 2 can output.

[0048] In some implementations, a linear proportional method can be used to calculate the target current value. This means the target current value equals the current temperature difference divided by the preset maximum temperature difference, then multiplied by the rated maximum current. For example, if the preset maximum temperature difference is 10°C, the rated maximum current is 1650A, and the current difference is 8°C, then the target current value is 8 divided by 10 and multiplied by 1650, equaling 1320A. This linear relationship ensures that the current changes continuously proportionally to the difference; the larger the difference, the larger the current, and vice versa. In other implementations, a segmented lookup table method or a PID control algorithm can be used to calculate the target current value to adapt to different process requirements and control accuracy requirements. Once the current temperature difference changes, the target current value is immediately adjusted accordingly, thus ensuring that the subsequent output heating current always matches the current heating demand.

[0049] Step S3200 converts the calculated target current value into an analog voltage signal and outputs it to the power supply 2, so that the power supply 2 can convert the received analog voltage signal into a corresponding heating current.

[0050] It should be noted that the calculated target current value is converted into a control command that power supply 2 can recognize, and power supply 2 is driven to output the actual heating current. The controller internally uses a digital-to-analog converter module to convert the target current value calculated in step S3100 into a corresponding analog voltage signal according to a preset ratio.

[0051] In some implementations, the amplitude of the analog voltage signal is typically within a control range of 0 to 10V, and is linearly proportional to the target current value; that is, the larger the target current value, the higher the output analog voltage value, and vice versa. For example, if the rated maximum current is 1650A corresponding to 10V, then the target current of 1320A corresponds to approximately 8V. This analog voltage signal is sent in real time to the control signal input terminal of power supply 2 via the analog output port of the controller, serving as a control command for the output power of power supply 2.

[0052] After receiving the analog voltage signal, the control circuit of power supply 2 uses it as a trigger command for its internal power devices (such as thyristors or IGBTs). By adjusting the conduction angle or duty cycle of the power devices, it rectifies the input three-phase AC power into a corresponding DC current output. The magnitude of the analog voltage signal directly determines the amplitude of the output current of power supply 2, and the two maintain a strict linear correspondence, thus accurately converting the current command issued by the controller into the actual DC heating current.

[0053] The DC heating current output by power supply 2 is transmitted to the pressing plate through the wire. Since the pressing plate is electrically connected to the positive and negative output terminals of power supply 2 and forms electrical contact with the conductive foil inside the material, the current flows through the conductive foil and heats it up.

[0054] Figure 4 The diagram illustrates the control method for the hot press provided by the present invention in a third embodiment. Step S1000 includes steps S1100 and S1400.

[0055] Step S1100: Obtain the real-time temperature value fed back by each of the temperature measuring elements 3.

[0056] Step S1200 determines whether each of the real-time temperature values ​​exceeds a preset normal temperature range to obtain a first determination result; or determines whether the rate of change of each of the real-time temperature values ​​exceeds a preset flicker threshold to obtain a second determination result.

[0057] It should be noted that the first judgment condition is the normal temperature range judgment, that is, judging whether a certain real-time temperature value exceeds the preset normal temperature range. This range is set according to the minimum and maximum temperatures allowed by the process. Exceeding this range means that the temperature measuring element 3 may have hardware failures such as open circuit, short circuit, or poor contact. The second judgment condition is the rate of change judgment, that is, calculating the rate of temperature change of a certain temperature measuring element 3 from the current moment to the previous moment (i.e., the rate of temperature change over time), and judging whether the rate of change exceeds the preset flicker threshold. The flicker threshold represents the maximum physically possible rate of heating or cooling. If the rate of change of a certain temperature measuring element 3 is abnormally high or low, it often means that the signal of the temperature measuring element 3 has been interfered with or has experienced occasional jumps. In some embodiments, the flicker threshold can be a factory setting or a preset setting during use.

[0058] Step S1300: When the first judgment result or the second judgment result is yes, determine that the corresponding temperature measuring element 3 is abnormal and remove the real-time temperature value corresponding to the temperature measuring element 3 that is determined to be abnormal.

[0059] It should be noted that the data of each temperature sensor 3 is filtered based on the judgment result of step S1200. When the real-time temperature value of a certain temperature sensor 3 is determined to be outside the normal temperature range, or its rate of change is determined to be outside the flicker threshold, the temperature value currently fed back by that temperature sensor 3 is considered abnormal data as long as either condition is met. Once a temperature sensor 3 is determined to be abnormal, its corresponding real-time temperature value is removed from subsequent calculations and no longer participates in the calculation of the average temperature. Of course, this removal action only applies to the temperature sensor 3 determined to be abnormal in the current control cycle. If the temperature sensor 3 recovers to normal in the next cycle, its data can be re-adopted, which ensures the fault tolerance of the system and avoids the entire temperature control system from malfunctioning due to the temporary failure of a single temperature sensor 3.

[0060] Step S1400: The arithmetic mean of the real-time temperature values ​​of all the temperature measuring elements 3 that were not rejected is taken as the current material temperature.

[0061] It should be noted that the real-time temperature values ​​of all remaining valid temperature measuring elements 3 after screening in step S1300 are summed, and then divided by the number of valid temperature measuring elements 3 to obtain their arithmetic mean. This average value is then used as the current material temperature. This method, through data fusion from multiple measuring points, can effectively eliminate local temperature deviations or measurement errors at individual measuring points, making the obtained material temperature more accurate and stable.

[0062] Figure 5 The diagram illustrates a fourth embodiment of the control method for the hot press provided by the present invention. It also includes a heating structure installed within the pressing plate; a temperature sensor is provided on the pressing plate for sensing its temperature; correspondingly, the method further includes steps S4100 to S4400.

[0063] Step S4100: Obtain the real-time surface temperature of the pressing plate.

[0064] It should be noted that, since heat always flows from a hotter object to a colder object, when the platen temperature is lower than the material temperature, heat will flow from the material to the platen, resulting in heat loss from the material. As a large metal component that directly contacts the material to be pressed, the temperature of the pressing plate itself directly affects the heat transfer from the material. Temperature sensors, typically thermocouples or resistance temperature detectors (RTDs), are installed at appropriate locations on the pressing plate to sense its real-time temperature. The analog signal acquisition module periodically reads the signals from these sensors and converts them into platen temperature values.

[0065] Step S4200 compares the real-time plate temperature with the current material temperature.

[0066] It should be noted that the real-time plate temperature obtained in step S4100 is subtracted from the current material temperature calculated in step S3400 to obtain a temperature difference. If the difference is negative, it means that the plate temperature is lower than the material temperature; if the difference is positive, it means that the plate temperature is higher than the material temperature; if the difference is zero, it means that the two temperatures are equal.

[0067] Step S4300: When the real-time plate temperature is lower than the current material temperature, control the heating structure to start to heat the pressing plate.

[0068] It should be noted that when the platen temperature is lower than the material temperature, some of the Joule heat generated by the conductive foil inside the material will spontaneously transfer to the pressing plate, causing heat loss and reducing the effective utilization rate of electrical energy for raising the material temperature. At this point, the heating structure installed inside the pressing plate is activated to heat the pressing plate. This heating process gradually brings the platen temperature closer to the material temperature. When the platen temperature approaches the material temperature, the temperature difference between the two decreases, and the tendency for heat to transfer from the material to the pressing plate weakens, thereby minimizing heat loss and ensuring that the majority of the heat generated by the conductive foil is used to raise the temperature of the material itself.

[0069] Step S4400: When the real-time plate temperature is equal to or greater than the current material temperature, control the heating structure to stop heating.

[0070] It should be noted that when the platen temperature reaches or exceeds the material temperature, it indicates that the problem of heat loss from the material to the pressing plate has been eliminated or reversed, and no further heating of the pressing plate is necessary. At this point, the heating structure can be stopped to prevent the platen temperature from becoming excessively higher than the material temperature, thus avoiding the situation where heat flows back from the pressing plate to the material, which could lead to uncontrolled or over-adjusted material temperature.

[0071] Figure 6 The diagram illustrates a fifth embodiment of the control method for the hot press provided by the present invention. The hot press control system further includes a hydraulic system electrically connected to the controller for controlling the pressure between the pressing plates; the method also includes steps S5100 to S5300.

[0072] Step S5100: Obtain the current pressure value output by the current hydraulic system.

[0073] It should be noted that the hydraulic system is the driving mechanism that propels the pressing plates to move relative to each other and applies pressure. Its output pressure directly determines the pressing force exerted on the material during the pressing process. Pressure sensors are installed in the hydraulic system's oil circuit, which can sense the hydraulic oil pressure in real time and convert it into an electrical signal, transmitting it to the controller. The controller periodically reads this signal through its analog signal acquisition module and converts it into the current pressure value. This acquisition process is performed continuously at a high frequency, ensuring that the controller always has a grasp of the latest pressure status output by the hydraulic system, providing real-time data support for subsequent precise pressure adjustment.

[0074] Step S5200 compares the current pressure value with the theoretical pressure value at the corresponding moment in the preset pressure curve to calculate the current pressure difference.

[0075] It should be noted that the preset pressure curve can be a factory setting or a "time-pressure" relationship curve pre-set and stored according to material characteristics and process requirements, reflecting the theoretical pressure value that the hydraulic system should output at each moment from the start to the end of the pressing process. When the pressing process reaches a certain moment, the theoretical pressure value corresponding to that moment is found from the preset pressure curve. Then, this theoretical pressure value is subtracted from the current actual pressure value obtained in step S5100, i.e., the theoretical pressure is subtracted from the actual pressure to obtain the current pressure difference. If the current pressure difference is positive, it means that the current actual pressure is lower than the theoretical pressure and pressure needs to be increased; if the current pressure difference is negative, it means that the current actual pressure is higher than the theoretical pressure and pressure needs to be released; if the difference is close to zero, it means that the current actual pressure basically meets the process requirements, and it is only necessary to maintain the current pressure state.

[0076] Step S5300 controls the hydraulic system to increase or decrease pressure based on the calculated current pressure difference.

[0077] It should be noted that when the current pressure difference calculated in step S5200 is positive and exceeds the preset allowable deviation range, it indicates that the current actual pressure is lower than the process requirements. The controller issues a pressurization command, controlling the pressurization valve of the hydraulic system to open, allowing the pressurized oil output from the hydraulic pump to enter the cylinder, pushing the pressing plate to increase the pressing force on the material until the actual pressure rises to near the theoretical pressure value. When the pressure difference is negative and exceeds the preset allowable deviation range, it indicates that the current actual pressure is higher than the process requirements. The controller issues a pressure relief command, controlling the pressure relief valve of the hydraulic system to open, releasing some of the pressurized oil in the cylinder, reducing the pressing force of the pressing plate on the material until the actual pressure drops to near the theoretical pressure value. When the pressure difference is within the preset allowable deviation range, the controller maintains the current pressure state and does not execute pressurization or pressure relief actions. Throughout the pressing process, the controller rapidly and cyclically executes the above judgment and adjustment actions based on the real-time pressure difference, forming a closed-loop pressure control circuit, ensuring that the actual pressure always follows the requirements of the preset pressure curve, and ensuring that the material completes the pressing process under the set pressure conditions.

[0078] To achieve the above objectives, the present invention also provides a hot-pressing control system, such as... Figure 7 As shown, the hot press control system includes at least one processor 6100; and a memory 5200 communicatively connected to the at least one processor 6100; wherein the memory 5200 stores instructions that can be executed by the at least one processor 6100, the instructions being executed by the at least one processor 6100 to enable the at least one processor 6100 to perform the above-described hot press control method.

[0079] The memory 5200 and processor 6100 are connected via a bus, which may include any number of interconnecting buses and bridges. The bus connects various circuits of one or more processors 6100 and memory 5200 together. The bus can also connect various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by processor 6100 is transmitted over a wireless medium via an antenna, which further receives data and transmits it to processor 6100.

[0080] The processor 6100 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 5200 can be used to store data used by the processor 6100 during operation.

[0081] To achieve the above objectives, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor 6100, implements the above-described control method for a hot press.

[0082] That is, those skilled in the art will understand that all or part of the steps in the methods described above can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0083] The structure of the hot press will be explained in more detail below.

[0084] This invention provides a hot press for hot pressing PCB boards. PCB boards typically consist of copper foil, prepreg, inner layers, and other components. The hot press is primarily used in the PCB board bonding process. Hot pressing involves heating the prepreg and applying pressure, causing the prepreg to undergo a solid-liquid-solid transformation process, thus bonding multiple layers of the core board.

[0085] like Figures 8 to 10 As shown, the hot press includes a housing 100 with an internally formed working cavity 110 and at least two pressing plates 200 housed within the working cavity 110. The housing 100 has a first opening 120 communicating with the working cavity 110 on its side wall, and a first door plate 400 is fitted into the first opening 120. The first door plate 400 has an upper limit position when the first opening 120 is closed and a lower limit position when the first opening 120 is fully open.

[0086] The first panel 400 is made of metal, typically steel, such as Q235 carbon steel or stainless steel. Hot presses usually require significant pressure during operation. The metal first panel 400 possesses extremely high tensile and compressive strength, preventing deformation or cracking under high pressure and ensuring equipment safety. The high modulus of elasticity of the metal ensures that the first panel 400 remains flat under long-term stress and will not warp due to repeated pressure, thus guaranteeing the precision of the pressed surface.

[0087] At least two pressing plates 200 are spaced apart in the vertical direction. The space between two adjacent pressing plates 200 contains a material tray (not shown), on which the material to be pressed (not shown) is stacked. For ease of explanation, the space between two adjacent pressing plates 200 is defined as the pressing space.

[0088] The material tray and the material on it are pushed into the housing 100 through the first opening 120 and placed on the pressing plates 200. The number of pressing plates 200 determines the number of pressing spaces. When there are two pressing plates 200, there is one pressing space; when there are three pressing plates 200, there are two pressing spaces; and when there are four pressing plates 200, there are three pressing spaces. That is, the number of pressing spaces is one less than the number of pressing plates 200.

[0089] like Figure 9 As shown, the housing 100 has five pressing plates 200 arranged in the upper and lower directions, providing four pressing spaces. This means that a maximum of four PCB boards can be pressed at a time. Of course, although the hot press has multiple pressing spaces, the user can use only one pressing space at a time; the number of pressing spaces utilized can be selected according to the user's actual needs. The following description uses an example of a hot press with five pressing plates 200, and assumes that materials are placed in all four pressing spaces formed by the five pressing plates 200. However, based on the above description, the scope of protection of this invention is not limited thereto.

[0090] The hot press also includes a first drive mechanism 300 disposed on the housing 100. The first drive mechanism 300 is connected to one of the highest or lowest positions of at least two pressing plates 200, and is used to adjust the distance between adjacent pressing plates 200 in the vertical direction. That is, the first drive mechanism 300 can adjust the size of the pressing space in the vertical direction, thereby realizing the hot pressing of materials.

[0091] When the loading tray and material are placed on the pressing plate 200 but not hot-pressed, the distance between adjacent pressing plates 200 in the up-down direction is a first distance. When the material is hot-pressed, the distance between adjacent pressing plates 200 in the up-down direction is a second distance, wherein the first distance is greater than the second distance. The first driving mechanism 300 enables the distance between adjacent pressing plates 200 in the up-down direction to switch between the first distance and the second distance.

[0092] In this embodiment, as Figure 9 and Figure 10As shown, at least two pressing plates 200 are divided into a first pressing plate 210, a second pressing plate 220, and a third pressing plate 230, with the third pressing plate 230 located between the first pressing plate 210 and the second pressing plate 220. The first pressing plate 210 is located at the lowest position, and the first driving mechanism 300 is connected to the first pressing plate 210.

[0093] The first drive mechanism 300 is used to output linear reciprocating motion in the up and down directions, thereby driving the first pressing plate 210 to rise or fall. When the first pressing plate 210 rises to a certain height, it will drive the multiple third pressing plates 230 located above it to rise together, until the material in the highest pressing space comes into contact with the highest second pressing plate 220. At this time, the material in each pressing space is in contact with the pressing plate 200 above and below, thereby achieving the purpose of hot pressing the material.

[0094] The specific structure of the first drive mechanism 300 is not limited, as long as it can output linear reciprocating motion in the up and down directions. In one embodiment, the first drive mechanism 300 is a hydraulic mechanism, such as a hydraulic cylinder. The first drive mechanism 300 can also be other mechanisms capable of outputting linear reciprocating motion, such as an electric cylinder. The following description uses a hydraulic cylinder as an example of the first drive mechanism 300.

[0095] The output end (piston rod) of the first drive mechanism 300 is provided with a connecting plate 310, and a first pad 320 is provided above the connecting plate 310. A first pressing plate 210 is provided on the first pad 320. The first drive mechanism 300 is located below the outside of the working chamber 110, and the connecting plate 310 and the first pad 320 are located inside the working chamber 110. The piston rod of the first drive mechanism 300 extends into the working chamber 110 and connects with the connecting plate 310.

[0096] The working chamber 110 is also provided with a second pad 150 on its top, and a second pressing plate 220 is disposed on the bottom end surface of the second pad 150. It is worth noting that the second pressing plate 220 is fixed on the second pad 150. The first pad 320 and the second pad 150 have a heat insulation function to prevent heat from escaping from the working chamber 110.

[0097] like Figure 10 and Figure 11As shown, the housing 100 also includes a support assembly 140 that acts on the pressing plates 200 (first pressing plate 210, third pressing plate 230). When hot pressing is not in progress, the support assembly 140 is located below the pressing plates 200, supporting them from the bottom to limit the lowest position of each pressing plate 200 within the working cavity 110. The pressing plates 200 have an extension block 260 that mates with the support assembly 140. When hot pressing is not in progress or the material tray is not placed on the pressing plates 200, the extension block 260 abuts against the top of the support assembly 140. The extension block 260 can be integrally formed with the pressing plates 200, meaning it is part of the pressing plates 200. Alternatively, the extension block 260 can be a separate block mounted on the side wall of the pressing plates 200.

[0098] The support assembly 140 includes at least a first support block 141 disposed on the cavity wall of the working cavity 110. Each pressing plate 200 may have two, three, four, five, or six such blocks. Preferably, each pressing plate 200 has four first support blocks 141 disposed thereon, with the four first support blocks 141 distributed near the four corners of the pressing plate 200. The pressing plate 200 is preferably square, but can be rectangular, square, etc. Of course, the pressing plate 200 can also adopt other shapes, which will not be elaborated here.

[0099] The support assembly 140 also includes a second support block 142 disposed on the first support block 141, wherein the first support block 141 is non-insulating and the second support block 142 is not insulating. Preferably, the first support block 141 is made of steel to ensure the strength and reliability of the support. The projections of the second support block 142 in the vertical direction overlap with the projections of the first support block 141 in the vertical direction. This reduces the space occupancy rate.

[0100] In another embodiment, the first support block 141, which is not made of insulating material, does not have a second support block 142. Instead, an insulating material or coating is provided on the outer periphery of the first support block 141 to achieve the purpose of insulation.

[0101] Of course, the first support block 141 can also be made of a material that can achieve good support strength and insulation performance, so there is no need to set an insulating second support block 142 on the first support block 141.

[0102] Considering that each pressing plate 200 requires four support components 140, the installation process would require repeated installation of the support components 140, which is time-consuming and labor-intensive. Therefore, multiple support components 140 located at the same corner of the pressing plate 200 are mounted on the same mounting plate 160, which extends vertically. In other words, multiple support components 140 at different heights located at the same corner of the pressing plate 200 are integrated onto a single mounting plate 160. During installation, simply install the mounting plates 160 corresponding to the four corners of the pressing plate 200 onto the cavity wall of the working chamber 110.

[0103] Furthermore, such as Figure 11 As shown, the mounting plate 160 is provided with a limiting groove 161 extending in the horizontal direction. The limiting groove 161 is used to ensure that the mounting plate 160 is in a horizontal state. The first support block 141 is provided in the limiting groove 161, and part of the first support block 141 is located outside the limiting groove 161, for supporting the pressing plate 200.

[0104] Multiple support components 140 on the mounting plate 160 are staggered in the vertical direction, so that when the lower pressing plate 200 moves upward, the extension block 260 on the lower pressing plate 200 can avoid the support components 140 above it and will not obstruct the upward movement of the lower pressing plate 200. As a result, the first pressing plate 210 and the multiple third pressing plates 230 can be raised to the preset pressing position under the action of the first driving mechanism 300.

[0105] To ensure that the multiple pressing plates 200 can move smoothly up and down, a guide structure 170 is provided between the housing 100 and the multiple pressing plates 200. For example... Figure 10 As shown, the guide structure 170 includes a guide bar 171 and a limiting block 172 that cooperates with the guide bar 171. The guide bar 171 is disposed on the cavity wall of the working cavity 110, and the limiting block 172 is formed on the pressing plate 200.

[0106] In one embodiment, the limiting block 172 is detachably mounted on the extension block 260 and cooperates with the guide strip 171. Guide structures 170 are provided at the four corners of the pressing plate 200. The four guide structures 170 restrict the translational freedom of the multiple pressing plates 200 in the horizontal direction, and the multiple pressing plates 200 only have translational freedom in the up and down directions.

[0107] During the up-and-down movement of the pressing plate 200, it repeatedly rubs against the guide strip 171, and the limiting block 172 is prone to wear. The detachable setting of the limiting block 172 makes it easy to replace, reduces replacement costs, and extends the service life of the pressing plate 200 and the extension block 260.

[0108] Considering that the first pressing plate 210 and the third pressing plate 230 in the pressing plate 200 support the material carrier plate, in order to reduce the damage to the first pressing plate 210 and the third pressing plate 230 during the feeding or discharging process of the material carrier plate, such as... Figure 12 As shown, the first pressing plate 210 and the third pressing plate 230 are provided with a lifting structure 250. The lifting structure 250 includes at least a lifting strip 251 extending along the feeding direction. The first pressing plate 210 and the third pressing plate 230 are provided with an opening slot 231 for accommodating the lifting structure 250 and having an open top. The lifting strip 251 can float in the opening slot 231 in the up and down directions.

[0109] The lifting strip 251 has a reset position and a pressure position. In the reset position and the pressure position, the top surface of the lifting strip 201 is higher than the top surface of the third pressing plate 230. Specifically, the position of the top surface of the lifting strip 251 in the reset position is higher than the position in the pressure position.

[0110] The first driving mechanism 300 operates, causing the first pressing plate 210 and the third pressing plate 230 to rise respectively. When the force applied by the first driving mechanism 300 reaches the preset requirement, the lifting strip 251 changes from the reset position to the pressed position under the action of the force applied by the first driving mechanism 300. At this time, the material tray abuts against the top surface of the pressing plate 200. During the process of the material tray being placed on the first pressing plate 210 and the third pressing plate 230, the material tray will not contact the top surface of the first pressing plate 210 and the third pressing plate 230. This can effectively prevent the material tray from scratching the first pressing plate 210 and the third pressing plate 230, thereby protecting the first pressing plate 210 and the third pressing plate 230.

[0111] The lifting structure 250 also includes an elastic element 252 located within the opening groove 231. The lifting strip 251 is floating on the first pressing plate 210 and the third pressing plate 230 via the elastic element 252. The elastic element 252 is abutted between the lifting strip 251 and the bottom of the opening groove 231, and is spaced apart in the extending direction of the lifting strip 251.

[0112] In one embodiment, please continue to refer to Figure 12As shown, the elastic element 252 is a spring washer. Further, the elastic element 252 includes multiple spring washers stacked vertically. The lifting strip 251 is positioned at the opening slot 231 via a first fastener 253. The top of the first fastener 253 is lower than the top of the opening slot 231, and the bottom of the opening slot 231 has holes that mate with the first fastener 253. The multiple spring washers are fitted onto the first fastener 253. In this structure, the first fastener not only connects the lifting strip 251 to the pressing plate but also limits the movement of the multiple spring washers. Of course, the elastic element 252 can be, but is not limited to, spring washers; it can also be a spring, or any other elastic element that allows the lifting strip 251 to float vertically.

[0113] like Figures 13 to 15 As shown, the hot press also includes a first door panel drive assembly, which includes a direct drive module 410 connected to the first door panel 400 and a limiting and pressing module 420 acting on the first door panel 400. The direct drive module 410 is configured to drive the first door panel 400 to perform linear reciprocating motion in the vertical direction to open or close the first opening 120. The limiting and pressing module 420 is configured to, in response to the first door panel 400 reaching its upper limit position, cause the first door panel 400 to have a tendency to press against the first opening 120 in a direction perpendicular to its lifting direction.

[0114] The direct drive module 410 includes a drive motor 411 located on the top of the housing 100, a reduction unit 412 located on the top of the housing 100 and connected to the output end of the drive motor 411, a wheel axle 413 connected to the reduction unit 412, pulleys 414 located at both ends of the wheel axle 413, and a drive belt (not shown) wound around the pulleys 414. One end of the drive belt is connected to the first door panel 400, and the other end is located on the pulley 414. When the drive motor 411 drives the wheel axle 413 to rotate, the pulley 414 rotates synchronously with the wheel axle 413, and the drive belt is either wound around the pulley 414 or unwound. During the process of the drive belt being wound around the pulley 414, the first door panel 400 rises to close the first opening 120. When the drive belt is unwound, the first door panel 400 falls to open the first opening 120.

[0115] Before pressing, air may remain between the materials in a hot press. If this air is not removed, it will expand at high temperatures, forming bubbles or hindering the tight bonding between layers, leading to delamination. A vacuum environment can quickly remove this air, allowing the layers to adhere tightly. Therefore, to ensure the quality of pressing, the hot press needs to achieve and maintain a certain degree of vacuum.

[0116] A sealing ring (not shown) is provided on the end face of the first door panel 400 near the first opening 120, and the sealing ring is distributed along the edge of the first opening 120. When the first door panel 400 closes the first opening 120, the sealing ring on the first door panel 400 is in a compressed state to isolate external air, thereby sealing the first opening 120 and ensuring the vacuum level in the working chamber 110.

[0117] However, under high temperature and high pressure, the sealing ring material will fail, and the sealing ring will not be able to spring back to its original shape, thus creating gaps and affecting the vacuum level. In this invention, the limiting and pressing module 420 can reduce or eliminate the gap between the first door panel 400 and the first opening 120, thereby improving the sealing performance of the first door panel 400.

[0118] In one embodiment, such as Figure 13 and Figure 14 As shown, the limiting and pressing module 420 includes at least a pair of vertical frame strips 421 distributed on opposite sides of the first door panel 400, and a linkage structure 422 connecting the vertical frame strips 421 and the housing 100. The first door panel 400 and the vertical frame strips 421 are slidably engaged. One end of the linkage structure 422 is hinged to the housing 100 and the other end is hinged to the vertical frame strips 421.

[0119] The vertical frame strips 421 are distributed along the up and down directions. The first door panel 400 has a dimension of L in the up and down directions, and the vertical frame strips 421 have a dimension greater than or equal to 2L in the up and down directions.

[0120] The upper part or top of the vertical frame strip 421 is provided with an upper blocking part 423. A pair of vertical frame strips 421 move upwards and closer to the first opening 120 under the action of the first door panel 400 abutting against the upper blocking part 423, so that the first door panel 400 closes and presses against the first opening 120. In this invention, there is a linked motion relationship between the first door panel 400 and the limiting and pressing module 420. The limiting and pressing module 420 uses the upward movement of the first door panel 400 to press the first door panel 400 against the first opening 120. That is, the upward movement of the first door panel 400 and the pressing against the first opening 120 can be achieved by a direct drive module 410. In one embodiment, the upper blocking part 423 can be a block fixed to the upper part or top of the vertical frame strip 421.

[0121] Furthermore, each vertical frame 421 is connected to two linkage structures 422, forming a parallelogram mechanism between the vertical frame 421, the two linkage structures 422, and the housing 100. The linkage structure 422 acts as the crank of the parallelogram mechanism. In this invention, each side of the first door panel 400 is connected to a parallelogram mechanism, distributing the weight of the first door panel 400 across the two parallelogram mechanisms on both sides, resulting in good overall force distribution. Because both sides of the first door panel 400 are constrained by the same parallelogram mechanism, the movement of the left and right sides of the first door panel 400 is synchronized during opening or closing. This effectively prevents the first door panel 400 from twisting or wobbling during movement, ensuring the stability of the first door panel 400's movement. Additionally, the parallelogram mechanism ensures that opposite sides remain parallel, guaranteeing that the first door panel 400 maintains its flatness during opening or closing and does not tilt, which is highly beneficial for sealing the first opening 120.

[0122] In another embodiment, such as Figure 15 As shown, the limiting and clamping module 420 includes a clamping cylinder 421a and a pressure block 422a disposed on the piston rod of the clamping cylinder 421a. The limiting and clamping module 420 is located on opposite sides of the first opening 120. Specifically, the cylinder body of the clamping cylinder 421a is disposed on the housing 100, and the free end of the piston rod is connected to the pressure block 422a. The pressure block 422a and the cylinder body of the clamping cylinder 421a are respectively located on opposite sides of the first door panel 400. When the first door panel 400 is in the upper limit position under the drive of the direct drive module 410, the first opening 120 is closed. At this time, the piston rod of the clamping cylinder 421a retracts, and the pressure block 422a presses against the first door panel 400, so that the first door panel 400 is tightly attached to the first opening 120, thereby eliminating the gap between the first door panel 400 and the first opening 120. In this solution, the action of the first door panel 400 opening or closing the first opening 120 and the action of the first door panel 400 pressing the housing 100 are achieved by two drives.

[0123] The following description uses the parallelogram mechanism formed between the limiting clamping module 420 and the housing 100 as an example. However, as can be seen from the above description, the scope of protection of this invention is not limited thereto.

[0124] like Figure 14 and Figure 16As shown, a groove 4211 and a sliding part 4261 that cooperates with the groove 4211 are provided between the vertical frame strip 421 and the first door panel 400. The groove 4211 is provided on the vertical frame strip 421, and the sliding part 4261 is provided on the first door panel 400. Specifically, the groove 4211 extends in the up and down direction, and the sliding part 4261 is at least partially located within the groove 4211. The first door panel 400 is slidably disposed on the vertical frame strip 421 through the cooperation between the groove 4211 and the sliding part 4261.

[0125] Considering that the sliding part 4261 is prone to wear during its up-and-down sliding within the groove 4211, the sliding part 4261 is detachably connected to the first door panel 400, allowing for convenient replacement when the sliding part 4261 wears out. Specifically, the sliding part 4261 is mounted on the connecting block 426, and the sliding part 4261 and the connecting block 426 are integrally formed. The connecting block 426 is detachably connected to the first door panel 400. Alternatively, the sliding part 4261 can be detachably mounted on the connecting block 426, and the connecting block 426 can be detachably mounted on the first door panel 400. Preferably, the sliding part 4261 protrudes outward from the connecting block 426.

[0126] At least one pair of sliding portions 4261 are provided on the first door panel 400. The pair of sliding portions 4261 are respectively located on a pair of opposite sidewalls of the first door panel 400, and the pair of sliding portions 4261 are distributed in a one-to-one correspondence with the vertical frame strips 421. In one embodiment, the number of sliding portions 4261 is four. Each sidewall of the pair of opposite sidewalls of the first door panel 400 is provided with two sliding portions 4261, and each vertical frame strip 421 corresponds to two sliding portions 4261. Preferably, the first door panel 400 is square, and the four sliding portions 4261 are distributed at the four corners of the first door panel 400. The distribution at the four corners can make the connection more stable and reliable, and the up and down sliding smoother.

[0127] like Figure 14 As shown, a first sensor 430 is provided on the top of the housing 100. The first sensor 430 is used to define the upper limit position of the first door panel 400. The first sensor 430 is triggered in response to the first door panel 400 moving to the upper limit position, so that the direct drive module 410 stops working.

[0128] The first sensor 430 has a sensing range. When the top (top surface) of the first door panel 400 rises into the sensing range of the first sensor 430, the first sensor 430 is triggered. The first sensor 430 can be an inductive proximity switch, a photoelectric switch, an ultrasonic sensor, etc. By setting the first sensor 430, the upper limit position of the first door panel 400 can be limited, preventing the first door panel 400 from overshooting and damaging the structure of the limit clamping module 420.

[0129] Furthermore, a second sensor 440 is provided on the vertical frame strip 421. The second sensor 440 is located below and close to the first sensor 430, with the upper blocking part 423 located above the second sensor 440. The second sensor 440 is configured to cause the direct drive module 410 to decelerate when the top of the first door panel 400 moves to the position of the second sensor 440. The second sensor 440 also has a sensing range. When the top of the first door panel 400 moves into the aforementioned sensing range, the second sensor 440 is triggered and sends a signal to cause the direct drive module 410 to decelerate, thereby slowing down the upward speed of the first door panel 400, reducing the collision force between the first door panel 400 and the upper blocking part 423, extending the service life of the limiting and pressing module 420, and reducing noise.

[0130] In this invention, a third sensor 450 is also provided on the vertical frame strip 421. The third sensor 450 is located below and away from the first sensor 430. The upper blocking portion 423 is located above the third sensor 450. The second sensor 440 is located between the third sensor 450 and the upper blocking portion 423.

[0131] The third sensor 450 is configured to stop the direct drive module 410 from operating when the first door panel 400 is at its lower limit position. In other words, the third sensor 450 is used to sense the lower limit position of the first door panel 400, and the direct drive module 410 stops operating when the first door panel 400 is at its lower limit position.

[0132] In this invention, each of the pair of vertical frame bars 421 is provided with an upper blocking portion 423. At least one of the pair of vertical frame bars 421 is provided with a second sensor 440 and a third sensor 450; alternatively, each of the pair of vertical frame bars 421 may be provided with a second sensor 440 and a third sensor 450. The bottom of the vertical frame bar 421 is provided with a lower blocking portion 425, which is configured to limit the movement of the first door panel 400 to a lower limit position. In one embodiment, the lower blocking portion 425 is a block fixed to the bottom of the vertical frame bar 421.

[0133] Furthermore, a foot pad 424 is provided on the bottom surface (bottom) of the vertical frame strip 421, which is used to support the vertical frame strip 421. Before the first door panel 400 contacts the upper blocking part 423, the foot pad 424 is supported on the ground by the gravity of the vertical frame strip 421. For ease of explanation, the direction of the first door panel 400 is defined as forward, and the direction of the first opening 120 is defined as backward. When the first door panel 400 rises to the position of abutting the upper blocking part 423, the vertical frame strip 421 moves upward and backward under the action of the first door panel 400. At the same time, the first door panel 400 is pressed against the first opening 120 under the action of the vertical frame strip 421. Thus, the two actions of closing the first opening 120 and pressing the first opening 120 are achieved by the upward movement of the first door panel 400. As the first door panel 400 descends, the vertical frame strip 421 and the upper blocking part 423 descend along with it under the influence of gravity. Once the foot pad 424 contacts the ground, the vertical frame strip 421 will not descend further. At this point, the upper blocking part 423 disengages from the first door panel 400 (the contact is released), and the first door panel 400 continues to descend under the action of the direct drive module 410. The foot pad 424 provides cushioning and noise reduction during the descent of the vertical frame strip 421.

[0134] like Figures 17 to 20 As shown, the pressing plate 200 is provided with a liquid circuit, which includes multiple main liquid channels 240 extending along the feeding direction. The multiple main liquid channels 240 are located between the top and bottom surfaces of the pressing plate 200. The liquid circuit also includes multiple branch channels 241 for connecting two adjacent main liquid channels 240, and the multiple branch channels 241 are also located between the top and bottom surfaces of the pressing plate 200.

[0135] Multiple main liquid channels 240 are arranged side-by-side, specifically, in a direction perpendicular to the feed direction. For ease of explanation, the multiple main liquid channels 240 are described as having a first main liquid channel 2401, a second main liquid channel 2402, and a third main liquid channel 2403. There is only one first main liquid channel 2401; only one second main liquid channel 2402; and there may be one or more third main liquid channels 2403. The first main liquid channel 2401 is the inlet channel, the second main liquid channel 2402 is the outlet channel, and the third main liquid channel 2403 connects the first main liquid channel 2401 and the second main liquid channel 2402. The third main liquid channel 2403 is located between the first main liquid channel 2401 and the second main liquid channel 2402, and the number of third main liquid channels 2403 determines the density of the main liquid channels 240 on the pressing plate 200. When the number of third main liquid channels 2403 is large, the main liquid channels 240 are arranged more densely on the pressing plate 200; when the number of third main liquid channels 2403 is small, the main liquid channels 240 are arranged more sparsely on the pressing plate 200.

[0136] To facilitate the explanation of the connection between the first main liquid channel 2401, the second main liquid channel 2402, and the third main liquid channel 2403, the following explanation will use the cases of having only one third main liquid channel 2403 and having two third main liquid channels 2403 as examples.

[0137] When there is only one third main liquid channel 2403, there are two branch channels 241. One branch channel 241 connects the downstream end of the first main liquid channel 2401 to the upstream end of the third main liquid channel 2403, and the other branch channel 241 connects the downstream end of the third main liquid channel 2403 to the upstream end of the second main liquid channel 2402.

[0138] When there are two third main liquid channels 2403, there are three branch channels 241. Specifically, there is one branch channel 241 between the downstream end of the first main liquid channel 2401 and the upstream end of the third main liquid channel 2403; there is one branch channel 241 between the downstream end of the first third main liquid channel 2403 and the upstream end of the other third main liquid channel 2403; and there is one branch channel 241 between the downstream end of the other third main liquid channel 2403 and the upstream end of the second main liquid channel 2402.

[0139] In this invention, multiple main liquid channels 240 and multiple branch channels 241 form a liquid circuit on the pressing plate 200. Compared with the integrated liquid circuit in the prior art, the segmented distribution of the main liquid channels 240 and branch channels 241 in this invention is more conducive to manufacturing and processing, and also facilitates the expansion of the distribution of the liquid circuit.

[0140] In this invention, such as Figure 18 and Figure 19 As shown, the branch channel 241 is formed on the plug 242, and the top or bottom surface of the pressing plate 200 is provided with a mounting groove 243 that mates with the plug 242. When it is necessary to clean the liquid circuit on the pressing plate 200, simply remove the plug 242 from the mounting groove 243 to clean the main liquid channel 240 and the branch channel 241, which is very convenient.

[0141] Furthermore, such as Figure 20 As shown, there is a height difference between the main liquid channel 240 and the branch channel 241, meaning that the main liquid channel 240 and the branch channel 241 are not located at the same height. In one embodiment, the branch channel 241 is lower than the main liquid channel 240. The projected portions of the main liquid channel 240 and the branch channel 241 overlap on the projection plane, where the "projection plane" refers to the side wall surface on the pressing plate 200 that is parallel to the feeding direction.

[0142] When there is a height difference between the main liquid channel 240 and the branch channel 241 in the height direction, the radiation range of the liquid can be expanded in the upper and lower directions, that is, in the thickness direction of the pressing plate 200, so that the liquid circuit on the pressing plate 200 can take into account both horizontal and vertical dimensions, further improving the cooling or heating effect.

[0143] The presence of a height difference between the main liquid channel 240 and the branch channel 241 creates a sudden geometric change (step or drop) when liquid flows from the main liquid channel 240 into the branch channel 241. This abrupt change forces the liquid to change its flow direction. At this geometric change point, the liquid undergoes overturning and mixing, allowing the hotter liquid to fully mix with the cooler liquid, homogenizing the liquid's temperature profile and resulting in a more uniform temperature as it enters the next section, thus ensuring better cooling or heating effects. Furthermore, it can extend the flow path of the liquid circuit to some extent, prolonging the flow time of the liquid within the pressure plate 200, further improving the cooling or heating effect of the liquid circuit.

[0144] In this invention, such as Figure 17 and Figure 21As shown, the main liquid channel 240 extends through the pressure plate 200 in the feeding direction. A plug 244 is filled in the end hole of the main liquid channel 240 near the first opening 120, and the plug 244 is sealed to the end hole. The branch channel 241 is located on the side of the plug 244 away from the first opening 120. Furthermore, a first baffle 245 is provided on the side wall of the pressure plate 200 to shield the plug 244, and the first baffle 245 abuts against the plug 244.

[0145] In addition to shielding the plug body 244, the first baffle 245 abuts against the plug body 244, providing a continuous axial clamping force to the plug body 244, forming a rigid stop, ensuring that the plug body 244 is always in a clamped state, and preventing the plug body 244 from loosening due to the pressure caused by the liquid flow during use.

[0146] When the seal between the plug 244 and the end hole fails, liquid will attempt to seep out from the edge of the plug 244. After the first baffle 245 comes into close contact with the plug 244, it can form a mechanical barrier in the leakage path of the liquid. Even if a small amount of liquid seeps out, it needs to overcome the huge contact resistance between the first baffle 245 and the plug 244, thus playing a role in auxiliary sealing.

[0147] First guide wheel sets 270 are provided on the sidewalls of the first pressing plate 210 and the third pressing plate 230, perpendicular to the feeding direction and close to the first opening 120. The first guide wheel sets 270 are used to support the material tray from the bottom and form rolling contact with the material tray to facilitate the material tray entering the working chamber 110. In one embodiment, the first guide wheel sets 270 are provided on the first baffle 245, and the axes of the first guide wheels of the first guide wheel sets 270 are horizontally distributed and perpendicular to the feeding direction.

[0148] The working chamber 110 is also equipped with a plurality of second guide wheel groups 280, which are arranged at intervals in the feeding direction. Each second guide wheel group 280 includes a plurality of second guide wheels, which are distributed at intervals in the up and down directions, and the axes of the second guide wheels are distributed along the up and down directions. When the first drive mechanism 300 is not working, there are the aforementioned second guide wheels between two adjacent pressing plates 200, and the second guide wheels are distributed close to the lower pressing plate 200 of the two adjacent pressing plates 200.

[0149] A second baffle 232 is provided on the top surface of the first pressing plate 210 and the third pressing plate 230. The function of the second baffle 232 is to protect the first pressing plate 210 and the third pressing plate 230 from damage caused by the loading and unloading of the material tray. The second baffle 232 has an avoidance opening 2321 corresponding to the opening slot 231. In one embodiment, the second baffle 232 and the first baffle 245 are integrally formed to form an "L"-shaped cover.

[0150] like Figure 18 As shown, the pressing plate 200 is also provided with a heating structure, such as an electric heating rod 290. The pressing plate 200 has a first mounting hole 291 for mounting the electric heating rod 290. The pressing plate 200 is also provided with a pair of thermocouples 292 for sensing the temperature on the pressing plate 200. The pressing plate 200 has a second mounting hole for mounting the thermocouples 292. The first mounting hole 291 and the second mounting hole are formed on the side wall M of the pressing plate 200 away from the first opening 120. One end of the electric heating rod 290 and the thermocouple 292 extends from the above-mentioned opening to the outside of the pressing plate 200. It is worth noting that the main liquid channel 240 has an inlet 246 and an outlet 247 formed on the side wall M, wherein the inlet 246 is the upstream end of the first main liquid channel 2401 and the outlet 247 is the downstream end of the second main liquid channel 2402.

[0151] Furthermore, such as Figure 21 As shown, the pressing plate 200 is also equipped with a junction box 293, where the connecting wires of the electric heating rod 290 and the thermocouple 292 converge. Specifically, the junction box 293 is provided on the side wall M of the pressing plate 200, and the junction box 293 is equipped with a connecting rod 294. One end of the connecting rod 294 is connected to the side wall M of the pressing plate 200, and the other end is connected to the box wall of the junction box 293. The connecting rod 294 and the junction box 293 are made of heat-insulating material to prevent heat from the pressing plate 200 from being transferred to the junction box 293, and to prevent the wiring inside the junction box 293 from being affected by the heat of the pressing plate 200.

[0152] There is no overlap between the projection of junction box 293 in the material inlet / outlet direction and the projections of liquid inlet 246 and liquid outlet 247 in the material inlet / outlet direction, which facilitates the connection of liquid inlet 246 and liquid outlet 247 with external pipelines.

[0153] like Figure 22 and Figure 23As shown, the housing 100 is also provided with a second opening 130, and a door frame is rotatably provided at the second opening 130. A second door plate 500 for opening or closing the second opening 130 is floating on the door frame. The second opening 130 is distributed facing the first opening 120. The second opening 130 is located near the junction box 293, which facilitates circuit inspection and maintenance.

[0154] The second door panel 500 has a closed position when the second opening 130 is closed and an open position when the second opening 130 is open. The housing 100 is provided with a second drive mechanism 510 for switching the second door panel 500 between the closed position and the open position.

[0155] The door frame is rotatably mounted on the housing 100 via a drive shaft 520. A second drive mechanism 510 is connected to the drive shaft 520 to drive its rotation. The second drive mechanism 510 can be a mechanism with a rotary output section, such as a motor or a combination of a motor and a reducer; it can also be a gear or rack mechanism, with the gear mounted on the drive shaft 520. The second drive mechanism 510 is existing technology and will not be described in detail here; any mechanism capable of outputting rotary motion to drive the drive shaft 520 is acceptable.

[0156] Furthermore, the door frame is mounted on the drive shaft 520, and the second door panel 500 is mounted on the door frame. When the drive shaft 520 rotates, it drives the door frame and the second door panel 500 to rotate together, thereby enabling the second door panel 500 to switch between the closed position and the open position.

[0157] In one embodiment, the door frame includes an upper support arm 501 and a lower support arm 502, which are respectively connected to a drive shaft 520, and a second door panel 500 is disposed between the upper support arm 501 and the lower support arm 502.

[0158] Specifically, the upper support arm 501 is located above the second door panel 500, and the lower support arm 502 is located below the second door panel 500. The top of the second door panel 500 has a first shaft segment 503, and the bottom of the second door panel 500 has a second shaft segment 504. Both the first shaft segment 503 and the second shaft segment 504 are distributed along the vertical direction. The first shaft segment 503 and the second shaft segment 504 are located on the extension of the same straight line, and are distributed near or at the axis of symmetry (center) of the second door panel 500.

[0159] In one embodiment, the first shaft segment 503 is rotatably connected to the upper support arm 501, and the second shaft segment 504 is rotatably connected to the lower support arm 502. Alternatively, the first shaft segment 503 and the second shaft segment 504 can also be understood as two extensions extending from the second door panel 500 to its upper and lower parts, respectively. The second door panel 500 is fixedly connected to the first shaft segment 503 and the second shaft segment 504; in other words, the second door panel 500 cannot rotate relative to the first shaft segment 503 and the second shaft segment 504. Thus, the second door panel 500, the first shaft segment 503, and the second shaft segment 504, as a whole, can rotate relative to the door frame.

[0160] In another embodiment, the second door panel 500 is rotatably connected to the first shaft segment 503 and the second shaft segment 504. The first shaft segment 503 can be fixedly connected to the upper support arm 501 or rotatably connected. Similarly, the second shaft segment 504 can be fixedly connected to the lower support arm 502 or rotatably connected.

[0161] Furthermore, the top of the second door panel 500 is provided with a first column 505, and the bottom of the second door panel 500 is provided with a second column 506. Preferably, both the first column 505 and the second column 506 extend in the vertical direction. The first column 505 and the second column 506 are located on the same side of the line connecting the first shaft segment 503 and the second shaft segment 504. The bottom end of the first column 505 is connected to the second door panel 500, and the top end of the first column 505 is connected to the upper support arm 501. The top end of the second column 506 is connected to the second door panel 500, and the bottom end of the second column 506 is connected to the lower support arm 502.

[0162] In this invention, the arrangement of the second door panel 500, upper support arm 501, lower support arm 502, first shaft segment 503, second shaft segment 504, first column 505, and second column 506 enables the second door panel 500 to rotate around the drive shaft 520 and to rotate slightly on the door frame. This "slight rotation" refers to the second door panel 500 being able to rotate slightly around the common axis X of the first shaft segment 503 and the second shaft segment 504, thus allowing the second door panel 500 to float on the door frame.

[0163] Since the second door panel 500 can rotate or swing slightly around the axis X between the upper support arm 501 and the lower support arm 502, when the door frame drives the second door panel 500 to press against the second opening 130, the second door panel 500 can automatically align itself according to the force, thereby realizing the adaptive adjustment of the second door panel 500.

[0164] To ensure the sealing performance of the working chamber 110, a sealing element, such as a sealing strip, is provided between the second door panel 500 and the second opening 130. A slight rotation of the second door panel 500 allows it to more evenly conform to the sealing strip or the edge of the second opening 130. Even if the second door panel 500 itself is installed at a slight tilt, the self-adaptive slight rotation of the door panel can compensate for installation errors, thereby improving the sealing performance.

[0165] In this invention, the first column 505 and the second column 506 are located on the extension of the same straight line. For ease of explanation, the common axis of the first column 505 and the second column 506 is defined as axis Y. The distance between axis Y and axis X determines the rotation of the second door panel 500. The greater the distance between axis Y and axis X, the smaller the rotation or swing amplitude of the second door panel 500. The rotation or swing amplitude of the second door panel 500 can be adjusted by adjusting the distance between axis Y and axis X, making it more convenient to use.

[0166] In this invention, a locking mechanism 530 is provided between the housing 100 and the door frame. The locking mechanism 530 is configured to lock the second door panel 500 onto the housing 100 when the second door panel 500 is in the closed position, and to release the locking relationship between the second door panel 500 and the housing 100 when the second door panel 500 switches from the closed position to the open position.

[0167] The aforementioned locking mechanism 530 is provided between the upper support arm 501 and the housing 100, and the aforementioned locking mechanism 530 is also provided between the lower support arm 502 and the housing 100. In other words, a locking mechanism 530 is provided between the top of the door frame and the housing 100, and a locking mechanism 530 is also provided between the bottom of the door frame and the housing 100. This ensures that the door frame has a better locking effect and a more ideal overall force-bearing effect.

[0168] like Figures 24 to 26 As shown, the locking mechanism 530 includes a first locking block 531 disposed on the housing 100, a second locking block 532 disposed on the door frame, and a third driving mechanism disposed on the housing 100. The first locking block 531 has a first hook portion 5311 formed thereon, and the second locking block 532 has a second hook portion 5321 formed thereon. The first hook portion 5311 and the second hook portion 5321 cooperate with each other. The first hook portion 5311 and the second hook portion 5321 have a first state when they are engaged and a second state when they are disengaged. The third driving mechanism is used to drive the first locking block 531 to move, thereby switching the state between the first hook portion 5311 and the second hook portion 5321.

[0169] Of course, the third drive mechanism can also be located on the door frame, acting on the second hook 5321 to drive the second hook 5321 to move, thereby realizing the switching between the states of the first hook 5311 and the second hook 5321. The following description takes the third drive mechanism located on the housing 100 and acting on the first locking block 531 as an example, but as can be seen from the above description, the scope of protection of the present invention is not limited thereto.

[0170] The third drive mechanism can drive the first locking block 531 to rotate or move in the vertical direction, so that the first hook 5311 and the second hook 5321 switch between the first state and the second state. Of course, the direction of movement of the first locking block 531 is not limited to the vertical direction, but can also be the front-back direction or the left-right direction. The following description uses the movement of the first locking block 531 in the vertical direction as an example.

[0171] like Figures 25 to 27 As shown, the third drive mechanism includes a cylinder 533 mounted on the housing 100, a movable seat 534 mounted on the piston rod of the cylinder 533, and a fixed seat 535 supporting the movable seat 534. The fixed seat 535 is mounted on the housing 100, the movable seat 534 is slidably mounted on the fixed seat 535, and a first locking block 531 is rotatably mounted on the movable seat 534. A rotation axis Z exists between the first locking block 531 and the movable seat 534, and the rotation axis Z is perpendicular to the sliding direction of the movable seat 534. The extension and retraction direction of the piston rod of the cylinder 533 is consistent with the sliding direction of the movable seat 534. A first compression spring 536 is also provided between the first locking block 531 and the movable seat 534.

[0172] like Figure 28 As shown, the fixed base 535 is provided with a straight groove 5351, which has openings at both ends and at the top. The width of the top opening of the straight groove 5351 in the Z direction of the rotation axis is smaller than the width of the bottom of the groove. The first hook 5311 is located inside the top opening of the straight groove 5351.

[0173] The straight groove 5351 has a first end N near the cylinder 533 and a second end away from the cylinder 533. The second end of the straight groove 5351 is provided with a limiting protrusion 5352, which is located inside the top opening of the straight groove 5351. The limiting protrusion 5352 makes the cross-section of the top opening at the second end of the straight groove 5351 smaller. The first hook portion 5311 is formed with an inclined surface P that cooperates with the limiting protrusion 5352. In the direction from the limiting protrusion 5352 to the first end N, the inclined surface P is gradually raised upward.

[0174] When the second door panel 500 is in the closed position, the second hook 5321 of the second locking block 532 is engaged with the first hook 5311 of the first locking block 531. Under the action of the first compression spring 536, the first locking block 531 always remains in a horizontal state, and the first hook 5311 always maintains an engaged relationship with the second hook 5321. At this time, the first hook 5311 is located at any position between the limiting protrusion 5352 and the first end N. Any of the above positions is either the movable seat 534 or the original position of the first locking block 531.

[0175] When the second door panel 500 needs to be opened, the piston rod of the control cylinder 533 moves, causing the movable seat 534 and the first locking block 531 to move along the direction from the first end N to the limiting protrusion 5352. When the inclined surface P of the first hook 5311 moves to the limiting protrusion 5352, under the action of the limiting protrusion 5352, the first hook 5311 is forced to rotate downward to avoid the upper limiting protrusion 5352. At this time, the first hook 5311 disengages from the second hook 5321. The second drive mechanism 510 drives the door frame to rotate, thereby realizing the switching of the second door panel 500 from the closed position to the open position.

[0176] The locking mechanism 530 keeps the second door panel 500 closed, even if the second drive mechanism 510 is powered off or loses power. Furthermore, the holding force of the second drive mechanism 510 alone is often insufficient; the locking mechanism 530 provides a more reliable static holding force and can also, to some extent, press the sealing strip between the second door panel 500 and the second opening 130, improving the sealing effect. When there are pressure changes inside the housing 100 or when the exterior is pressed, the locking mechanism 530 becomes the primary point of force application, thus protecting the second drive mechanism 510 from impact damage.

[0177] The first shaft segment 503 and the second shaft segment 504 constitute a shaft structure, through which the second door panel 500 is mounted on the door frame. The shaft structure and the locking mechanism 530 are both distributed at the axis of symmetry of the second door panel 500. This ensures that the rotational inertia of the second door panel 500 is symmetrically distributed during opening and closing, resulting in smooth opening and closing without swaying. Combined with the locking mechanism 530, the second door panel 500 can be uniformly locked.

[0178] Furthermore, both the upper support arm 501 and the lower support arm 502 are straight strips. One end of the upper support arm 501 and the lower support arm 502 is connected to the drive shaft 520, and the other end, facing each other, is connected to the aforementioned shaft structure. The locking mechanism 530 is located at the other end of the upper support arm 501 and the lower support arm 502. That is, the locking point of the first locking block 531 and the second locking block 532 is located at the other end of the upper support arm 501 and the lower support arm 502. With the above arrangement, the locking mechanism 530 can counteract the bending moment generated by the second door panel 500 on the upper support arm 501 and the lower support arm 502, significantly reducing the bending deformation of the upper support arm 501 and the lower support arm 502.

[0179] In this invention, such as Figures 29 to 31 As shown, a material tray is housed within the space between adjacent pressing plates 200 in the vertical direction. The material tray is pushed into this space through the first opening 120. To limit the insertion position of the material tray, a position detection structure 600 for the upper limit of the material tray in its insertion direction is also provided inside the housing 100. The position detection structure 600 and the first opening 120 are located on opposite sides of at least two pressing plates 200. The position detection structure 600 is distributed close to the pressing plates 200, or rather, the position detection structure 600 is distributed adjacent to the end of the pressing plate 200 away from the first opening 120. In this way, when the material tray is placed on the pressing plate 200, the material tray and the position detection structure 600 can touch.

[0180] The position detection structure 600 includes a vertical rod 610 fixed in the upper and lower direction within the housing 100, a movable rod 620 disposed on the vertical rod 610, and a trigger element 630 disposed on the vertical rod 610 and cooperating with the movable rod 620. The movable rod 620 is located closer to the pressing plate 200 than the vertical rod 610. The movable rod 620 has an initial position and a trigger position. The movable rod 620 moves from the initial position to the trigger position in response to contact with the material tray, and returns to the initial position in response to disengagement from the material tray. The trigger element 630 is activated in response to the movement of the movable rod 620 from the initial position to the trigger position. The trigger element 630 can be a limit switch or other mechanical position detection switch, which converts mechanical displacement into an electrical signal by physically triggering the opening and closing of internal contacts.

[0181] Specifically, the upright 610 and the movable rod 620 are connected by at least one connecting rod 650, wherein one end of the connecting rod 650 is pivotally connected to the upright 610 and the other end is pivotally connected to the movable rod 620. When the material tray abuts against or touches the movable rod 620, the material tray pushes the movable rod 620 upward and toward the side closer to the upright 610. The upright 610 touches the trigger 630, causing the trigger 630 to be activated. At this time, the movable rod 620 is in the activated position.

[0182] A first groove 6101 is provided at the connection between the upright rod 610 and the connecting rod 650, and one end of the connecting rod 650 is received in the first groove 6101. A second groove 6201 is provided at the connection between the movable rod 620 and the connecting rod 650, and the other end of the connecting rod 650 is received in the second groove 6201. Thus, on the one hand, the first groove 6101 and the second groove 6201 provide constraints on both sides of the connecting rod 650, making it less prone to lateral swaying or shaking during movement, resulting in more stable and precise movement. On the other hand, the first groove 6101 and the second groove 6201 can shield against dust and debris, reducing the entry of foreign objects into the pivot point and lowering the risk of jamming and wear. Furthermore, it also reduces the overall space occupied by the position detection structure 600, making the structure more compact.

[0183] A stop block 640 is provided on the upright 610, located below the movable rod 620. The stop block 640 is used to limit the lowest position of the movable rod 620, or in other words, to limit the initial position of the movable rod 620. After the material tray is removed from the pressing plate 200, the movable rod 620 moves downward and away from the upright 610 under its own gravity, until the bottom of the movable rod 620 abuts against the stop block 640. At this point, the movable rod 620 is in its initial position. When the movable rod 620 is in its initial position, there is a movement gap between the movable rod 620 and the upright 610 in the feeding direction to provide space for the movement of the movable rod 620.

[0184] Furthermore, a biasing member 660 is provided between the movable rod 620 and the upright rod 610. One end of the biasing member 660 is connected to the movable rod 620, and the other end is connected to the upright rod 610. The biasing member 660 can be a spring, a flexible pad, etc., preferably a spring. The biasing member 660 is used to reset the movable rod 620, that is, to reset it from the triggered position to the initial position.

[0185] To make the movement of the movable rod 620 more stable and reliable, in one embodiment, two connecting rods 650 are provided between the movable rod 620 and the upright rod 610, thereby forming a four-bar linkage between the movable rod 620, the upright rod 610, and the two connecting rods 650. The pivot point between the connecting rod 650 and the upright rod 610 is lower than the pivot point between the connecting rod 650 and the movable rod 620.

[0186] The advantages of the above two pivot positions being staggered in height are as follows: it allows the connecting rod 650 to be arranged in an inclined manner, which makes the direction of the force on the connecting rod 650 more reasonable, effectively reducing the lateral component force and making the movement more stable; the staggered height can avoid dead point positions, making the mechanism stable throughout the entire operation.

[0187] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A thermo-pressing control system, characterized in that, include: At least two pressing plates are arranged opposite each other in the vertical direction, and the two adjacent pressing plates can move relative to each other and press together; A material tray, located between two adjacent pressing plates, is used to hold the material to be pressed, wherein the material contains conductive foil and at least two temperature measuring elements. The power supply, whose positive and negative terminals are electrically connected to two adjacent pressing plates, is used to output heating current that is applied to the conductive foil through the pressing plates, so that the conductive foil generates Joule heat. The controller is electrically connected to both the power supply and the temperature sensing element, and is configured to: Obtain the current material temperature fed back by the temperature measuring element; The current material temperature is compared with the theoretical temperature value at the corresponding moment in the preset temperature curve, and the current temperature difference is calculated. Based on the current temperature difference, the power supply outputs a corresponding heating current to the conductive foil to adjust the material's heating rate.

2. The hot-press control system as described in claim 1, characterized in that, The step of controlling the power supply to output a corresponding heating current to the conductive foil based on the current temperature difference includes: Calculate the target current value based on the current temperature difference, the preset maximum temperature difference, and the rated maximum current; The calculated target current value is converted into an analog voltage signal and output to the power supply, so that the power supply can convert the received analog voltage signal into a corresponding heating current.

3. The hot-pressing control system as described in claim 1, characterized in that, The step of obtaining the current material temperature fed back by the temperature measuring element includes: Obtain the real-time temperature values ​​fed back by each of the aforementioned temperature measuring elements; Determine whether each of the real-time temperature values ​​exceeds a preset normal temperature range to obtain a first determination result; or, determine whether the rate of change of each of the real-time temperature values ​​exceeds a preset flicker threshold to obtain a second determination result. If the first or second judgment result is yes, the corresponding temperature measuring element is determined to be abnormal and the real-time temperature value corresponding to the determined abnormal temperature measuring element is removed. The arithmetic mean of the real-time temperature values ​​of all the temperature measuring devices that were not rejected is taken as the current material temperature.

4. The hot-pressing control system as described in claim 1, characterized in that, It also includes a heating structure, which is installed inside the pressing plate and electrically connected to the controller; the pressing plate is provided with a temperature sensor for sensing the temperature of the pressing plate; Accordingly, the controller is also configured to: Obtain the real-time surface temperature of the pressing plate; Compare the real-time plate temperature with the current material temperature; When the real-time plate temperature is lower than the current material temperature, the heating structure is activated to heat the pressing plate. When the real-time plate temperature is equal to or greater than the current material temperature, the heating structure is controlled to stop heating.

5. The hot-pressing control system as described in claim 1, characterized in that, It also includes a hydraulic system electrically connected to the controller for controlling the pressure between the pressing plates; The controller is also configured to: Obtain the current pressure value output by the current hydraulic system; The current pressure value is compared with the theoretical pressure value at the corresponding moment in the preset pressure curve to calculate the current pressure difference. Based on the calculated current pressure difference, the hydraulic system is controlled to increase or decrease pressure.

6. The hot-pressing control system as described in claim 1, characterized in that, Also includes: The housing has a working cavity inside, and a first opening communicating with the working cavity is provided on the side wall of the housing. The first opening is equipped with a first door panel. The at least two pressing plates are housed within the working cavity; A first driving mechanism is disposed on the housing. The first driving mechanism is connected to one of the highest or lowest positions of at least two pressing plates and is used to adjust the spacing between adjacent pressing plates in the vertical direction. The first door panel drive assembly includes a direct drive module connected to the first door panel and a limiting and pressing module acting on the first door panel; The direct drive module is configured to drive the first door panel to perform linear reciprocating motion in the vertical direction to open or close the first opening, and the first door panel has at least an upper limit position when the first opening is closed. The limiting and pressing module is configured to respond to the action of the first door panel moving to the upper limit position, such that the first door panel has a tendency to press against the first opening in a direction perpendicular to its lifting direction.

7. The hot-pressing control system as described in claim 6, characterized in that, The limiting and pressing module includes at least a pair of vertical frame strips distributed on opposite sides of the first door panel, and a linkage structure connecting the vertical frame strips and the housing. The first door panel and the vertical frame strips are slidably engaged. One end of the linkage structure is hinged to the housing and the other end is hinged to the vertical frame strips. The upper part or top of the vertical frame strip is provided with an upper blocking part. In response to the abutment action between the first door panel and the upper blocking part, the pair of vertical frame strips move upward and closer to the first opening under the drive of the first door panel, so as to close the first door panel and press the first opening.

8. A control method for a hot press, characterized in that, include: The current material temperature is obtained from the temperature measuring element, which is located between the materials to be pressed. The current material temperature is compared with the theoretical temperature value at the corresponding moment in the preset temperature curve, and the current temperature difference is calculated. Based on the current temperature difference, the power supply outputs a corresponding heating current to the conductive foil to adjust the material's heating rate.

9. A thermo-pressing control system, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the control method for the hot press as described in claim 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the control method for the hot press as described in claim 8.

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