A vacuum reactor with variable frequency stirring and heating system

Abstract

The present invention discloses a vacuum reactor with a variable frequency stirring and heating system, comprising: a mold temperature controller, a vacuum pump, a control module, a first frequency converter, a reactor body and a communication module; wherein the control module is connected to the mold temperature controller, the vacuum pump and the first frequency converter through the communication module; the first frequency converter is connected to the stirring motor included in the reactor body, and is used to: receive the operating parameter adjustment instruction sent by the control module, control the speed and torque of the stirring motor; monitor the current information of the stirring motor, and determine the change information of the stirring load; the mold temperature controller is connected to the reactor body based on the first pipeline, and is used to adjust the temperature of the reactor body; the vacuum pump is connected to the reactor body based on the second pipeline, and is used to adjust the vacuum of the reactor body. Accurate stirring control and temperature control are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of system control, and in particular to a vacuum reactor with a variable frequency stirring and heating system. Background Art

[0002] A reactor is a comprehensive reaction vessel. Its structure, function and configuration can be modified according to different reaction conditions to obtain the best use effect. It is widely used in the production fields of petroleum, chemical industry, rubber, pesticide, dye, medicine, food, etc. In the production and preparation process of powder materials, raw materials (including powder raw materials, liquid raw materials, solid raw materials, etc.) are usually put into a reactor in a certain proportion for mixing and stirring. During the stirring process, the mixture in the reactor needs to be heated and stirred to obtain the best quality material. In addition, in order to improve the heating efficiency and reduce the manufacturing cost, the material mixing chamber in the reactor is first vacuumed before heating, and then heated under vacuum.

[0003] Existing reactors cannot accurately achieve stirring control and temperature control. For example, when performing stirring control, it is impossible to accurately control the speed and torque of the stirring motor, determine the change information of the stirring load, and determine whether the stirring is uniform. When performing temperature control, it is impossible to accurately adjust the cold water pump. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the purpose of the present invention is to provide a vacuum reactor with a variable frequency stirring and heating system to accurately achieve stirring control and temperature control.

[0005] To achieve the above-mentioned purpose, the embodiment of the present invention proposes a vacuum reactor with a variable frequency stirring and heating system, comprising: a mold temperature controller, a vacuum pump, a control module, a first frequency converter, a reactor body and a communication module; wherein,

[0006] The control module is connected with the mold temperature controller, the vacuum pump and the first frequency converter through the communication module;

[0007] The first frequency converter is connected to the stirring motor included in the reactor body, and is used to:

[0008] Receive the operating parameter adjustment instructions sent by the control module to control the speed and torque of the stirring motor;

[0009] Monitor the current information of the stirring motor and determine the change information of the stirring load;

[0010] The mold temperature controller is connected to the reactor body based on the first pipeline, and is used to adjust the temperature of the reactor body;

[0011] The vacuum pump is connected to the reactor body through the second pipeline, and is used to perform vacuum adjustment on the reactor body;

[0012] It also includes: a generating module, which is used to compare the change information of the stirring load determined by the first frequency converter with a preset change threshold; when it is determined that the change information is less than the preset change threshold, generate prompt information indicating that the stirring is completed;

[0013] A detection module, used for detecting the stirring information of the reactants in the reactor body after the generation module generates a prompt message indicating that the stirring is completed, and judging whether the reactants in the reactor body are stirred uniformly according to the stirring information;

[0014] The detection module comprises:

[0015] Compute module for:

[0016] After the generation module generates prompt information indicating that stirring is completed, image information of the reactants in the reactor body is obtained;

[0017] Obtaining the RGB color value of each pixel in the image information in the RGB color space; the RGB color value includes an R channel value, a G channel value, and a B channel value;

[0018] Compare the RGB color value of each pixel in the RGB color space with the preset RGB color value, determine the pixel whose difference is less than the preset difference as the target pixel, and count the number of target pixels; calculate the ratio of the number of target pixels and the number of all pixels, and determine whether it is greater than the preset ratio;

[0019] The judgment module is used to judge that the reactants in the reactor body are stirred evenly when the calculation module determines that the ratio is greater than the preset ratio; otherwise, it indicates that the reactants in the reactor body are stirred unevenly.

[0020] According to some embodiments of the present invention, a temperature sensor and a pressure sensor are provided in the reactor body for obtaining temperature information and pressure information in the reactor body.

[0021] According to some embodiments of the present invention, a display module is further included for displaying control information of the reactor body; the control information includes set time, operating time, set speed, set frequency, operating frequency, output current, output voltage, and forward and reverse rotation information.

[0022] According to some embodiments of the present invention, the mold temperature controller includes: a second frequency converter, a cold water tank, a cold water pump, a cold water container and a hot oil container; wherein,

[0023] The hot oil container is connected to the first pipeline;

[0024] The cold water container is in contact with the hot oil container;

[0025] A cold water pump connected to the cold water tank and the cold water container;

[0026] The second frequency converter is connected to the cold water pump.

[0027] According to some embodiments of the present invention, the mold temperature controller is used to receive temperature control information sent by the control module, query the preset temperature control-flow data table according to the temperature control information, determine the target flow of the cold water pump, generate the adjustment frequency of the second inverter according to the target flow and the preset algorithm, and control the cold water pump to perform temperature control processing.

[0028] According to some embodiments of the present invention, generating an adjustment frequency of the second frequency converter according to a target flow rate and a preset algorithm includes:

[0029]

[0030] in, is the adjustment frequency of the second frequency converter, Hz; is the target flow rate of the cooling water pump, m 3 / s; The number of pole pairs of the rotating magnetic field of the motor included in the cooling water pump; is the output pressure of the cooling water pump, Pa; is the leakage coefficient of the cooling water pump, the value range is (1,1.2), (m 3 / s) / Pa; is the current water temperature in the cold water container, ℃; The preset water temperature in the cold water container is 15℃; is the dynamic viscosity of water at the current temperature, Pa·s; is the viscosity-temperature coefficient of water, and its value range is (0.001, 0.01); is the displacement of the cooling water pump, m 3 / r; is the bulk modulus of water, Pa.

[0031] The present invention proposes a vacuum reactor with a variable frequency stirring and heating system. The control module is connected to the mold temperature controller, the vacuum pump and the first frequency converter through the communication module to realize temperature control, vacuum control and stirring control. The first frequency converter is connected to the stirring motor included in the reactor body, and is used to: receive the operating parameter adjustment instructions sent by the control module, control the speed and torque of the stirring motor; monitor the current information of the stirring motor, determine the change information of the stirring load; and realize accurate stirring control. The temperature of the reactor body is adjusted based on the mold temperature controller, and the temperature of the mold temperature controller is controlled based on the communication module. When the temperature of the reactor is lower than the first temperature threshold, the mold temperature controller automatically heats up, and when the temperature of the reactor is higher than the second temperature threshold, the mold temperature controller automatically cools down. In this way, the temperature of the reactor can be controlled within the set range, and accurate temperature control can be realized.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0033] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 is a block diagram of a vacuum reactor with a variable frequency stirring and heating system according to an embodiment of the present invention;

[0036] Figure 2 This is a connection diagram of a vacuum reactor with a variable frequency stirring and heating system according to an embodiment of the present invention;

[0037] Figure 3 is a block diagram of a detection module according to an embodiment of the present invention.

[0038] Reference numerals:

[0039] Reactor body 1 , second pipeline 2 , first pipeline 3 , vacuum pump 4 , mold temperature controller 5 , cold water container 51 , hot oil container 52 , cold water tank 53 , cold water pump 54 . DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0041] like Figure 1-3 As shown, the embodiment of the present invention proposes a vacuum reactor with a variable frequency stirring and heating system, including: a mold temperature controller 5, a vacuum pump 4, a control module, a first frequency converter, a reactor body 1 and a communication module; wherein,

[0042] The control module is connected to the mold temperature controller 5, the vacuum pump 4 and the first frequency converter through the communication module;

[0043] The first frequency converter is connected to the stirring motor included in the reactor body 1, and is used for:

[0044] Receive the operating parameter adjustment instructions sent by the control module to control the speed and torque of the stirring motor;

[0045] Monitor the current information of the stirring motor and determine the change information of the stirring load;

[0046] The mold temperature controller 5 is connected to the reactor body 1 based on the first pipeline 3, and is used to adjust the temperature of the reactor body 1;

[0047] The vacuum pump 4 is connected to the reactor body 1 based on the second pipeline 2, and is used to perform vacuum adjustment on the reactor body 1;

[0048] It also includes: a generating module, which is used to compare the change information of the stirring load determined by the first frequency converter with a preset change threshold; when it is determined that the change information is less than the preset change threshold, generate prompt information indicating that the stirring is completed;

[0049] A detection module, used for detecting the stirring information of the reactants in the reactor body 1 after the generation module generates a prompt message indicating that the stirring is completed, and judging whether the reactants in the reactor body 1 are stirred uniformly according to the stirring information;

[0050] The detection module comprises:

[0051] Compute module for:

[0052] After the generation module generates prompt information indicating that stirring is completed, image information of the reactants in the reactor body 1 is obtained;

[0053] Obtaining the RGB color value of each pixel in the image information in the RGB color space; the RGB color value includes an R channel value, a G channel value, and a B channel value;

[0054] Compare the RGB color value of each pixel in the RGB color space with the preset RGB color value, determine the pixel whose difference is less than the preset difference as the target pixel, and count the number of target pixels; calculate the ratio of the number of target pixels and the number of all pixels, and determine whether it is greater than the preset ratio;

[0055] The judgment module is used to judge whether the reactants in the reactor body 1 are stirred evenly when the calculation module determines that the ratio is greater than the preset ratio; otherwise, it indicates that the reactants in the reactor body 1 are stirred unevenly.

[0056] The working principle and beneficial effects of the above technical solution: The control module is connected to the mold temperature controller 5, the vacuum pump 4 and the first frequency converter through the communication module to realize temperature control, vacuum control and stirring control. The first frequency converter receives the operating parameter adjustment instruction sent by the control module based on the communication interface included in the communication module, such as the RS-232 interface, parses the received instruction, and extracts the set value of the stirring motor speed and torque. The first frequency converter can adjust the power supply frequency and voltage of the motor as needed to control the speed of the stirring motor. At the same time, by adjusting the current of the stirring motor, the output torque of the stirring motor can be indirectly controlled. The control module generates a pulse width modulation (PWM) signal, which controls the voltage and current of the stirring motor by adjusting the duty cycle (i.e., the proportion of high level time to total time). The larger the duty cycle, the higher the voltage and current of the stirring motor, thereby increasing the speed and torque; otherwise, it decreases. The PWM signal is sent to the motor driver, and the driver converts the PWM signal into an actual voltage and current signal to drive the motor to rotate. According to the resolved speed and torque setting values, the control module adjusts the duty cycle of the PWM signal and sends the adjusted voltage and current signals to the mixing motor through the first frequency converter. The mixing motor adjusts its speed and torque according to the received voltage and current signals to achieve the set operating parameters. The current information of the mixing motor can be monitored by an ammeter installed on the motor power line. The current of the mixer is closely related to the load of the motor. When the mixing load increases, the motor needs to consume more current to generate sufficient torque to drive the mixer. By comparing the current current value with the set value or historical data, the changing trend and abnormal situation of the mixing load can be judged. According to the changing information of the mixing load, the control system can adjust the operating parameters such as the speed and torque of the mixing motor in real time to adapt to the change of the load. For example, when the load increases, the control module can increase the speed and torque of the mixing motor to increase the output power; when the load decreases, the speed and torque of the mixing motor can be reduced to save energy and achieve accurate mixing control. The temperature of the reactor body 1 is adjusted based on the mold temperature controller 5, and the temperature of the mold temperature controller 5 is controlled based on the communication module. When the temperature of the reactor is lower than the first temperature threshold, the mold temperature controller 5 is automatically heated, and when the temperature of the reactor is higher than the second temperature threshold, the mold temperature controller 5 is automatically cooled. In this way, the temperature of the reactor can be controlled within a set range, and the range is formed according to the first temperature threshold and the second temperature threshold. When it is determined that the change information is less than the preset change threshold, it means that the stirring process tends to be stable, the mixing process tends to be stable, and a prompt message of stirring completion is generated, which is convenient for adjusting the stirring motor to stop running and realize accurate stirring control. The detection module includes a camera, which analyzes the color characteristics of the reactants after stirring through image processing technology to evaluate the stirring uniformity. Real-time monitoring and automatic evaluation of the stirring process are realized, thereby ensuring that the reactants are evenly stirred in the reactor, improving the reaction efficiency and product quality.The calculation module is responsible for evaluating the stirring uniformity of the reactants in the reactor by image processing technology after the stirring process is completed (after the generation module issues a prompt message indicating that the stirring is completed). Use a camera or other image acquisition device to capture the image of the reactants in the reactor body 1. Transmit the captured image information to the calculation module for processing. Preset an RGB color value (representing the color of the ideal stirring state). Compare the RGB color value of each pixel with the preset RGB color value, and calculate the difference between the two. The difference represents the sum of the differences of each channel. If the difference between the RGB color value of a pixel and the preset value is less than the preset difference, the pixel is regarded as a "target pixel" and the number of all target pixels is counted. According to the number of target pixels and the number of all pixels, the ratio of the two is calculated, and it is judged whether it is greater than the preset ratio. The preset ratio is 0.8. The preset RGB color value, the preset difference and the preset ratio need to be reasonably set according to the actual situation and experimental data to ensure the accuracy and reliability of the judgment. The judgment module is used to judge that the reactants in the reactor body 1 are stirred uniformly when the calculation module determines that the ratio is greater than the preset ratio; otherwise, it indicates that the reactants in the reactor body 1 are stirred unevenly. It is possible to accurately judge whether the reactants in the reactor body 1 are stirred evenly. When it is determined that the stirring is uneven, the stirring motor is controlled to stir again, thereby improving the accuracy of stirring control.

[0057] According to some embodiments of the present invention, a temperature sensor and a pressure sensor are disposed in the reactor body 1 to obtain temperature information and pressure information in the reactor body 1 .

[0058] The beneficial effects of the above technical solution are: it is convenient to check the temperature information and pressure information in the reactor body 1, and it is convenient to perform vacuum adjustment and temperature adjustment in time.

[0059] According to some embodiments of the present invention, a display module is further included for displaying control information of the reactor body 1; the control information includes set time, running time, set speed, set frequency, running frequency, output current, output voltage, and forward and reverse rotation information.

[0060] According to some embodiments of the present invention, the mold temperature controller 5 includes: a second frequency converter, a cold water tank 53, a cold water pump 54, a cold water container 51 and a hot oil container 52; wherein,

[0061] The hot oil container 52 is connected to the first pipeline 3;

[0062] The cold water container 51 is in contact with the hot oil container 52;

[0063] A cold water pump 54 connected to the cold water tank 53 and the cold water container 51;

[0064] The second frequency converter is connected to the cold water pump 54 .

[0065] The working principle and beneficial effects of the above technical solution are as follows: The temperature of the reactor body 1 is regulated by transferring temperature based on hot oil. The temperature of cold water is controlled based on the cold water pump 54, which acts as a cooling system and transfers heat with the hot oil to regulate the temperature of the hot oil. The second frequency converter is connected to the cold water pump 54, and the second frequency converter adjusts the cold water pump 54 according to the corresponding frequency to control the water volume, thereby achieving accurate control of the temperature.

[0066] According to some embodiments of the present invention, the mold temperature controller 5 is used to receive temperature control information sent by the control module, query the preset temperature control-flow data table according to the temperature control information, determine the target flow of the cold water pump 54, generate the adjustment frequency of the second inverter according to the target flow and the preset algorithm, and control the cold water pump 54 to perform temperature control processing.

[0067] The working principle and beneficial effects of the above technical solution: the mold temperature machine 5 and the control module transmit data through a communication protocol (such as Modbus, Profibus, etc.). The control module sends instructions containing information such as the target temperature or temperature deviation to the mold temperature machine 5. In the control system of the mold temperature machine 5, a corresponding relationship table between temperature regulation and the flow rate of the cold water pump 54 (i.e., temperature regulation-flow data table) is pre-stored. This table is established based on experimental data or engineering experience, and reflects the flow value that the cold water pump 54 should reach under different temperature requirements. According to the temperature regulation information obtained by analysis, the mold temperature machine 5 queries the corresponding target flow value in the data table. This value represents the amount of cooling water that the cold water pump 54 needs to provide to achieve the target temperature. According to the target flow rate and the preset algorithm, the adjustment frequency of the second inverter is generated, and this frequency will directly affect the speed of the cold water pump 54 motor, thereby controlling the flow rate of the cooling water. If there is a deviation between the actual temperature and the target temperature, the mold temperature machine 5 will adjust the flow rate of the cold water pump 54 again (i.e., adjust the frequency of the second inverter) according to the deviation size and direction, forming a closed-loop control system. This process will continue until the actual temperature is stabilized within the target temperature range. The mold temperature controller 5 can accurately adjust the flow of the cold water pump 54 according to the temperature adjustment information sent by the control module to achieve accurate control of the temperature.

[0068] According to some embodiments of the present invention, generating an adjustment frequency of the second frequency converter according to a target flow rate and a preset algorithm includes:

[0069]

[0070] in, is the adjustment frequency of the second frequency converter, Hz; is the target flow rate of the cooling water pump, m 3 / s; The number of pole pairs of the rotating magnetic field of the motor included in the cooling water pump; is the output pressure of the cooling water pump, Pa; is the leakage coefficient of the cooling water pump, the value range is (1,1.2), (m 3 / s) / Pa; is the current water temperature in the cold water container, ℃; The preset water temperature in the cold water container is 15℃; is the dynamic viscosity of water at the current temperature, Pa·s; is the viscosity-temperature coefficient of water, and its value range is (0.001, 0.01); is the displacement of the cooling water pump, m 3 / r; is the bulk modulus of water, Pa.

[0071] The beneficial effects of the above technical solution are as follows: based on the above algorithm, according to the target flow of the cold water pump 54, the pole pair number of the rotating magnetic field of the motor included in the cold water pump 54, the output pressure of the cold water pump 54, the leakage coefficient of the cold water pump 54 and other parameters, the adjustment frequency of the second inverter is accurately calculated, which is convenient for determining the control parameters of the cold water pump 54, thereby realizing accurate temperature control.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A vacuum reactor with a variable frequency stirring and heating system, characterized in that: include: Mold temperature controller, vacuum pump, control module, first frequency converter, reactor body and communication module; wherein, The control module is connected with the mold temperature controller, the vacuum pump and the first frequency converter through the communication module; The first frequency converter is connected to the stirring motor included in the reactor body, and is used to: Receive the operating parameter adjustment instructions sent by the control module to control the speed and torque of the stirring motor; Monitor the current information of the stirring motor and determine the change information of the stirring load; The mold temperature controller is connected to the reactor body based on the first pipeline, and is used to adjust the temperature of the reactor body; The vacuum pump is connected to the reactor body through the second pipeline, and is used to perform vacuum adjustment on the reactor body; It also includes: a generating module, which is used to compare the change information of the stirring load determined by the first frequency converter with a preset change threshold; when it is determined that the change information is less than the preset change threshold, generate prompt information indicating that the stirring is completed; A detection module, used for detecting the stirring information of the reactants in the reactor body after the generation module generates a prompt message indicating that the stirring is completed, and judging whether the reactants in the reactor body are stirred uniformly according to the stirring information; The detection module comprises: Compute module for: After the generation module generates prompt information indicating that stirring is completed, image information of the reactants in the reactor body is obtained; Obtaining the RGB color value of each pixel in the image information in the RGB color space; the RGB color value includes an R channel value, a G channel value, and a B channel value; Compare the RGB color value of each pixel in the RGB color space with the preset RGB color value, determine the pixel whose difference is less than the preset difference as the target pixel, and count the number of target pixels; calculate the ratio of the number of target pixels and the number of all pixels, and determine whether it is greater than the preset ratio; The judgment module is used to judge that the reactants in the reactor body are stirred evenly when the calculation module determines that the ratio is greater than the preset ratio; otherwise, it indicates that the reactants in the reactor body are stirred unevenly.

2. The vacuum reactor with variable frequency stirring and heating system according to claim 1, characterized in that: The reactor body is provided with a temperature sensor and a pressure sensor for obtaining temperature information and pressure information in the reactor body.

3. The vacuum reactor with variable frequency stirring and heating system according to claim 1, characterized in that: It also includes a display module for displaying control information of the reactor body; the control information includes set time, running time, set speed, set frequency, running frequency, output current, output voltage, and forward and reverse rotation information.

4. The vacuum reactor with variable frequency stirring and heating system according to claim 1, characterized in that: The mold temperature controller includes: a second frequency converter, a cold water tank, a cold water pump, a cold water container and a hot oil container; wherein, The hot oil container is connected to the first pipeline; The cold water container is in contact with the hot oil container; A cold water pump connected to the cold water tank and the cold water container; The second frequency converter is connected to the cold water pump.

5. The vacuum reactor with variable frequency stirring and heating system according to claim 1, characterized in that: The mold temperature controller is used to receive the temperature adjustment information sent by the control module, query the preset temperature adjustment-flow data table according to the temperature adjustment information, determine the target flow of the cold water pump, generate the adjustment frequency of the second inverter according to the target flow and the preset algorithm, and control the cold water pump to perform temperature adjustment processing.

6. The vacuum reactor with variable frequency stirring and heating system according to claim 5, characterized in that: According to the target flow and the preset algorithm, the adjustment frequency of the second frequency converter is generated, including: in, is the adjustment frequency of the second frequency converter, Hz; is the target flow rate of the cooling water pump, m 3 / s; The number of pole pairs of the rotating magnetic field of the motor included in the cooling water pump; is the output pressure of the cold water pump, Pa; is the leakage coefficient of the cooling water pump, the value range is (1,1.2), (m 3 / s) / Pa; is the current water temperature in the cold water container, ℃; The preset water temperature in the cold water container is 15℃; is the dynamic viscosity of water at the current temperature, Pa·s; is the viscosity-temperature coefficient of water, and its value range is (0.001, 0.01); is the displacement of the cooling water pump, m 3 / r; is the bulk modulus of water, Pa.

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