A heating control system and heating control method for multiple layers inside and outside a mold

Abstract

This invention relates to a heating control system for molds, and more particularly to a heating control system and method for multiple layers inside and outside a mold. The heating control system is installed on a molding press and a mold temperature controller. The heating control system includes upper and lower layer heating control systems, an inner layer heating control system, and an outer middle layer heating control system. The molding press also includes a human-machine interface, a temperature controller, a programmable logic controller (PLC), a transformer, and a thyristor power regulator. The PLC establishes signal connections with the temperature controller, the mold temperature controller, and a platinum resistance thermometer (PTT). The temperature controller is connected to the mold temperature controller via the PTC to form a closed-loop system. A closed-loop control system is formed between the temperature controller and the PTC. By using a temperature controller, a thyristor, and a PTC, along with upper and lower heating plates, a middle heating blanket, and an inner layer heating tower, the problem of strict temperature control on the inner and outer surfaces and upper, middle, and lower layers of large molds in a molding press is solved, temperature control accuracy is improved, and the heating problem for irregularly shaped products is addressed.

Description

Technical Field

[0001] This invention relates to a heating control system for molds, and more particularly to a heating control system and method for multiple layers inside and outside a mold. Background Technology

[0002] Currently, it is known that existing molding presses control the temperature of the heating plate by using a temperature controller to control the heating tubes, and then the heating plate transfers heat to the mold to achieve the purpose of heating the mold. In this process, the temperature inside the product cannot be controlled or fed back, and there is a dead zone in temperature control. The inability to control the temperature inside the product will lead to uneven temperature between the inside and outside of the material, damage to the metallographic structure of the product, and inability to heat irregularly shaped products. When the temperature controller malfunctions and continues to heat, it cannot be stopped. When the heating working voltage is 220V or other high voltages, there is a risk of electric shock if the cable is damaged. The timeliness of temperature control is also poor. In order to address the above-mentioned defects and technical problems, this invention provides a heating control system and heating control method for multiple layers inside and outside of the mold. It uses a temperature controller, silicon controlled rectifier, platinum resistance thermometer, and upper and lower heating plates, and a heating blanket in the middle zone and an inner layer heating tower to solve the problem of strict temperature control inside and outside of large molds and at the top, middle and bottom. It also solves the problem of not being able to stop the machine when the temperature is abnormal, improves the temperature control accuracy and solves the heating problem of irregularly shaped products. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art, and to propose a heating control system and heating control method for multiple layers inside and outside the mold.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A heating control system for multiple layers inside and outside a mold is provided, comprising a heating control system on a molding press and a mold temperature controller. The heating control system includes upper and lower layer heating control systems, an inner layer heating control system, and an outer middle layer heating control system. The upper and lower layer heating control systems include an upper heating plate and a lower heating plate respectively positioned on the upper and lower layers of the mold, with multiple heating tubes installed in the upper and lower heating plates. The inner layer heating control system includes multiple stacked annular heating tubes forming a heating tower installed on the upper, middle, and lower walls of the mold's inner wall. The outer middle layer heating control system includes a heating blanket wrapping the outer middle layer of the mold. Contactors and platinum resistance thermometers are installed in the heating tubes and heating blanket. The molding press also includes a human-machine interface, a temperature controller, a programmable logic controller (PLC), a transformer, and a silicon controlled rectifier (SCR) power regulator. The PLC establishes signal connections with the temperature controller, the mold temperature controller, and the platinum resistance thermometer. The temperature controller is connected to the mold temperature controller via the platinum resistance thermometer to form a closed-loop system. A closed-loop control system is formed between the temperature controller and the platinum resistance thermometer. The mold temperature controller controls the upper and lower heating plates.

[0005] Furthermore, after the human-machine interface interacts and transmits information with the programmable controller, it establishes a signal connection with the platinum resistance thermometer.

[0006] Furthermore, the output ports one and two of the programmable controller are respectively connected to the input ports of the temperature controller and the contactor.

[0007] Furthermore, the output port of the temperature controller is connected to the input port of the thyristor power regulator.

[0008] Furthermore, the input port of the temperature controller is connected to the output port of the platinum resistance thermometer.

[0009] Furthermore, the output port of the thyristor power regulator establishes a signal connection with the input port of the transformer.

[0010] Furthermore, the output port of the transformer establishes a signal connection with the heating tube via a contactor.

[0011] A heating control method for a heating control system for multiple layers inside and outside a mold, comprising any one of the heating control systems for multiple layers inside and outside a mold as described in any of 1-7 above, comprising the following steps: Users can send the process formulas stored in the system through the human-machine interface; The human-machine interface determines the current parameters based on the process parameters stored in the system and sends them to the programmable controller. The programmable controller analyzes and calculates the parameters through a pre-designed program and then sends the current temperature setpoint to the temperature controller via 485 communication. After receiving the current set value, the temperature controller compares it with the actual temperature value fed back by the platinum resistance thermometer and then outputs an analog value through calculation. After receiving the analog signal, the thyristor power regulator outputs the power corresponding to the current analog signal to the transformer according to its own power range, and adjusts the heating tube and heating blanket to heat with the power output by the transformer. When the temperature value fed back from the heating element and heating blanket is about to reach the set temperature value, the temperature controller reduces the heating power step by step to reach the set value at the preset time. When the temperature controller malfunctions, the programmable controller will promptly activate the control contactor and issue an alarm feedback.

[0012] Furthermore, in step D, during the calculation, the temperature controller ultimately outputs an analog value to the thyristor power regulator through a PID algorithm.

[0013] Furthermore, in step F, several temperature controllers are simultaneously controlled during the process of reaching the set value at a preset time, forming a dual closed-loop system for multi-point data acquisition and control of the product.

[0014] Compared with existing technologies, the advantages of this invention are: This invention provides a heating control system and method for multiple layers inside and outside a mold. It uses a temperature controller, silicon controlled rectifier, and platinum resistance thermometer through upper and lower heating plates and a heating tower in the middle heating blanket. This solves the problem of strict temperature control required for the inner and outer surfaces and upper, middle and lower layers of large molds in a molding press, solves the problem of not being able to stop the machine due to abnormal temperature, improves the temperature control accuracy, and solves the heating problem for products with irregular shapes. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the closed-loop control system of the programmable controller, temperature controller, and mold temperature controller in this invention. Figure 2 This is a flowchart of the heating control system in this invention; Figure 3 This is a flowchart of the control process of the temperature controller and platinum resistance closed-loop system in this invention; Figure 4 This is a line graph of some parameters generated by the control system in this invention; 1-Human-Machine Interface; 2-Temperature Controller; 3-Programmable Logic Controller; 4-Transformer; 5-SCR Power Regulator; 6-Platinum Resistance Tester; 7-Contactor; 8-Heating Tube; 9-Electric Heating Tower; 10-Heating Blanket. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: A heating control system for multiple layers inside and outside a mold, wherein a heating control system is installed on a molding press and a mold temperature controller. The heating control system includes an upper and lower layer heating control system, an inner layer heating control system, and an outer middle layer heating control system. The upper and lower layer heating control system includes an upper heating plate and a lower heating plate respectively installed on the upper and lower layers of the mold for heating the upper and lower layers of the mold or product. Multiple heating tubes are installed in the upper and lower heating plates. The mold temperature controller controls the heating of the upper and lower heating plates.

[0018] Example 2: Based on Example 1, please refer to... Figure 2The control flowchart also includes a human-machine interface 1, a temperature controller 2, a programmable logic controller 3, a transformer 4, and a thyristor power regulator 5 in the molding machine; see continue. Figure 1 In this embodiment, the programmable controller 3 establishes signal connections with the temperature controller 2, the mold temperature controller, and the platinum resistance thermometer 6. The temperature controller 2 is connected to the mold temperature controller through the platinum resistance thermometer to form a closed-loop system. In this embodiment, the programmable controller 3 calculates the current temperature value based on the parameters and transmits it to the temperature controller 2 and the mold temperature controller. The temperature controller 2 and the mold temperature controller interact with each other and feed back the real-time temperature value to the programmable controller through the platinum resistance thermometer to form a closed-loop control system.

[0019] Example 3: Based on Example 1, a closed-loop control system is formed between the temperature controller 2 and the platinum resistance thermometer 6. A thyristor power regulator 5 is also provided between the temperature controller 2 and the platinum resistance thermometer 6. The output port of the temperature controller 2 is connected to the input port of the thyristor power regulator 5, and the output port of the thyristor power regulator 5 is connected to the input port of the transformer 4. The output port of the transformer 4 is connected to the heating tube 8 and the heating blanket 10 through the contactor 7. The platinum resistance thermometers in the heating tube 8 and the heating blanket 10 provide feedback on the actual temperature to the temperature controller 2 to form a complete closed-loop control system. After receiving the current set value, the temperature controller 2 compares it with the actual temperature value fed back by the platinum resistance thermometer.

[0020] Example 4: Based on Example 3, please refer to... Figure 3 Specifically, the temperature controller 2 outputs an analog signal ranging from 4-20mA, which is then sent to the thyristor power regulator 5. The thyristor power regulator 5 converts the 4-20mA analog signal into a voltage value of 0-220V, which is then sent to the transformer 4. The transformer 4 converts the 0-220V voltage value into a low voltage value ranging from 0-36V, which is then sent to the heating tubes in the heating tower and the platinum resistance thermometer in the heating blanket. The platinum resistance thermometer then provides real-time temperature feedback to the temperature controller, forming a complete closed-loop control system. In this embodiment, the transformer 4 can convert high voltage values ​​into low voltage values. To a certain extent, compared with the traditional method of dealing with excessively high voltage values, it can promptly disconnect the contactor and issue an alarm sound even in the event of cable damage or abnormal temperature.

[0021] Example 5: Based on Example 1, the inner heating control system includes multiple annular heating tubes stacked to form a heating tower 9, which is set on the upper, middle and lower walls of the inner wall of the mold, so that the heating tower formed can heat the upper, middle or lower walls of the mold or product.

[0022] Example 6: Continuing from Example 1, the outer layer middle heating control system mainly includes heating the outer layer middle of the mold after the heating blanket 10 is wrapped; a contactor 7 and a platinum resistance 6 are provided in the heating tube 8 and the heating blanket 10; in this example, the heating blanket 10 can be used flexibly, making its application scenarios more flexible and wider, and can be used to heat the outer layer of irregularly shaped products of different shapes.

[0023] Example 7: After the human-machine interface 1 interacts and transmits information with the programmable controller 3, it establishes a signal connection with the platinum resistance thermometer 6; the output port 1 and output port 2 of the programmable controller 3 establish signal connections with the input ports of the temperature controller 2 and the contactor 7, respectively; the input port of the temperature controller 2 establishes a signal connection with the output port of the platinum resistance thermometer 6.

[0024] Example 8: Based on Implementation 2, continue to refer to Figure 2 In the system, the programmable controller 3 can control the contactor 7. When the temperature in the system is abnormal, under safety considerations, it can promptly control the contactor to disconnect, causing the system to be de-energized, thus reducing the risk of electric shock. In the entire control system process, the platinum resistance thermometer 6 can simultaneously provide feedback information to both the programmable controller 3 and the temperature controller 2. Specifically, the platinum resistance thermometer can provide feedback on the temperature value of the mold at that moment to the temperature controller 2; the platinum resistance thermometer can also synchronously provide feedback on the temperature value of the mold at that moment to the programmable controller 3, enabling the temperature value to be uploaded to the human-machine interface of the system for real-time data interaction.

[0025] Example 9: A heating control method for a multi-layer heating control system for the inner and outer surfaces of a mold, comprising the following steps: 1. The user sends the process recipe stored in the system through the human-machine interface 1. The process recipe includes process parameters such as time, temperature, pressure, or speed. For example, when the set temperature is 0-100℃, it requires 2 hours to heat up; when it is 100℃-150℃, the required heating time is 1 hour; when it is 150℃-120℃, the required cooling time is 2 hours. In this embodiment, it can also refer to... Figure 4In the process, when the press temperature rises from 115℃ to 135℃, the average heating rate is ≤0.17℃ / min, and the temperature is held for 3 hours. When the press temperature rises from 135℃ to 155℃, the average heating rate is ≤0.17℃ / min, and the temperature is held continuously for 3 hours. When the press temperature rises from 155℃ to 180℃, the average heating rate is ≤0.17℃ / min. When the press plate is held at 180℃, the temperature of the mold thermocouple satisfies (145-150) x 2h (the start time of mold thermocouple holding is recorded when the normal maximum temperature of the thermocouple reaches 145℃). During the curing process, the temperature can be reduced according to the curing curve cooling requirements. During the insulation period of the bottom layer, the normal value of the thermocouple should not exceed 150℃. The upper and lower molds are hoisted to the center of the molding machine for pressurization. When the pressure reaches 100T, the pressure is maintained. At the same time, the temperature of the upper heating plate and the lower heating plate is increased to 140℃ at a rate of 3℃ / min, and then the heat preservation begins. The temperature displayed on the temperature controller 2 is constantly observed. When the temperature on the sensor reaches 90℃, the press is simultaneously cooled and pressurized. The requirements are as follows: Cooling requirements: The molding machine is cooled by water and fan until the temperature of the upper heating plate and the lower heating plate is 115℃, and then the heat preservation begins. 2. The human-machine interface 1 determines the current time, temperature, and rate values ​​based on the relevant parameters set above and sends them to the programmable controller 3. 3. The programmable controller 3 analyzes and calculates the relevant parameters through the designed program and then sends the current temperature setpoint to the temperature controller 2 via 485 communication. 4. After receiving the current set value, the temperature controller 2 compares it with the actual temperature value fed back by the platinum resistance 6 and then calculates and outputs an analog value. During the calculation, the temperature controller 2 calculates the analog value at the current moment through the PID algorithm and sends the final output analog value to the thyristor power regulator 5. 5. After receiving the analog value, the thyristor power regulator 5 outputs the power corresponding to the current analog value to the transformer 4 according to its own power range. The transformer changes the current power, increasing or decreasing the current power, and adjusts the heating tube 8 and heating blanket 10 to heat with the power output by the transformer 4. 6. When the temperature value fed back by the heating tube 8 and the heating blanket 10 is about to reach the set temperature value, the temperature controller 2 reduces the heating power by adjusting step by step, and reaches the set value at the preset time. During the process of reaching the set value at the preset time, several temperature controllers 2 are controlled at the same time, forming a dual closed-loop system for multi-point acquisition and control of the product. 7. When the temperature controller 2 malfunctions, the programmable controller 3 will promptly activate the contactor 7 and issue an alarm feedback.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heating control system for multiple layers inside and outside a mold, characterized in that: A heating control system is provided on the molding press and the mold temperature controller. The heating control system includes an upper and lower layer heating control system, an inner layer heating control system and an outer middle layer heating control system. The upper and lower layer heating control system includes an upper heating plate and a lower heating plate respectively set on the upper and lower layers of the mold. Multiple heating tubes are set in the upper heating plate and the lower heating plate. The inner layer heating control system includes multiple annular heating tubes stacked to form a heating tower (9) set on the upper wall, middle wall and lower wall of the inner wall of the mold. The outer middle layer heating control system includes a heating blanket (10) wrapped around the outer middle layer of the mold. A contactor (7) and a platinum resistance thermometer (6) are set in the heating tube (8) and the heating blanket (10). The molding machine also includes a human-machine interface (1), a temperature controller (2), a programmable controller (3), a transformer (4), and a thyristor power regulator (5); wherein the programmable controller (3) establishes signal connections with the temperature controller (2), the mold temperature controller, and the platinum resistance thermometer (6), and the temperature controller (2) is connected to the mold temperature controller through the platinum resistance thermometer to form a closed-loop system; a closed-loop control system is formed between the temperature controller (2) and the platinum resistance thermometer (6); the mold temperature controller controls the upper heating plate and the lower heating plate.

2. A heating control system for multiple layers inside and outside a mold according to claim 1, characterized in that: After the human-machine interface (1) interacts and transmits information with the programmable controller (3), it establishes a signal connection with the platinum resistance thermometer (6).

3. A heating control system for multiple layers inside and outside a mold according to claim 1, characterized in that: The output ports 1 and 2 of the programmable controller (3) are respectively connected to the input ports of the temperature controller (2) and the contactor (7).

4. A heating control system for multiple layers inside and outside a mold according to claim 1, characterized in that: The output port of the temperature controller (2) establishes a signal connection with the input terminal of the thyristor power regulator (5).

5. A heating control system for multiple layers inside and outside a mold according to claim 4, characterized in that: The input port of the temperature controller (2) establishes a signal connection with the output port of the platinum resistance thermometer (6).

6. A heating control system for multiple layers inside and outside a mold according to claim 4, characterized in that: The output port of the thyristor power regulator (5) establishes a signal connection with the input port of the transformer (4).

7. A heating control system for multiple layers inside and outside a mold according to claim 6, characterized in that: The output port of the transformer (4) establishes a signal connection with the heating tube (8) through the contactor (7).

8. A heating control method for a heating control system for multiple layers inside and outside a mold, comprising a heating control system for multiple layers inside and outside a mold as described in any one of claims 1-7, characterized in that, Includes the following steps: Users can send the process formula stored in the system through the human-machine interface (1); The human-machine interface (1) determines the current parameters by using the process parameters stored in the system and sends them to the programmable controller (3). The programmable controller (3) analyzes and calculates the parameters through the designed program and then sends the temperature set value corresponding to the current moment to the temperature controller (2) via 485 communication. After receiving the current set value, the temperature controller (2) compares it with the actual temperature value fed back by the current platinum resistance (6) and then outputs an analog value through calculation. After receiving the analog value, the thyristor power regulator (5) outputs the power corresponding to the current analog value to the transformer (4) according to its own power range, and adjusts the heating tube (8) and heating blanket (10) to heat with the power output by the current transformer (4); When the temperature values ​​fed back by the heating tube (8) and the heating blanket (10) are about to reach the set temperature value, the temperature controller (2) reduces the heating power by adjusting step by step, and reaches the set value at the preset time. When the temperature controller (2) malfunctions, the programmable controller (3) promptly activates the contactor (7) and issues an alarm feedback.

9. A heating control method for a multi-layer heating control system inside and outside a mold according to claim 8, characterized in that: In step D, during the calculation, the temperature controller (2) outputs the analog value to the thyristor power regulator (5) through the PID algorithm.

10. A heating control method for a multi-layer heating control system inside and outside a mold according to claim 8, characterized in that: In step F, several temperature controllers (2) are controlled simultaneously during the process of reaching the set value at a preset time, forming a dual closed-loop system for multi-point acquisition and control of the product.

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