Control method and device of rubber internal mixer

Abstract

The invention relates to a control method and device of a rubber internal mixer, and relates to the technical field of rubber processing.The control method comprises the steps that in response to a starting signal, product information and stirring information are obtained; determining an operation oil addition amount based on the product information and injecting operation oil based on the operation oil addition amount; determining the amount of clean oil according to the product information and the stirring information; processing temperature is collected based on preset temperature measurement points, and whether stirring is uniform or not is judged according to the processing temperature; if yes, stirring is completed, and operation oil is injected based on the clean oil amount; executing a preset rotation instruction and collecting the oil discharge amount; collecting cleaning temperature and judging whether cleaning is thorough or not according to the cleaning temperature; if yes, the residual oil amount is determined according to the discharged oil amount, the clean oil amount and the cleaning temperature; and correcting the addition amount of the operation oil of the next batch based on the residual oil amount. The cleaning device has the effects of being high in cleaning efficiency and good in cleaning effect.

Description

Technical Field

[0001] This invention relates to the field of rubber processing technology, and in particular to a control method and apparatus for a rubber internal mixer. Background Technology

[0002] Rubber is a high-molecular organic material with high elasticity, insulation, wear resistance and plasticity. The core goal of rubber processing is to mix rubber raw materials with various compounding agents and transform the originally plastic raw rubber into rubber products with stable elasticity and strength through processes such as plasticizing and vulcanization.

[0003] Currently, the raw rubber after plasticizing is put into an internal mixer, and then processing oil, reinforcing filler, activator, antioxidant, vulcanization accelerator and vulcanizing agent are added. The rotor in the internal mixer is used to evenly disperse the compounding agents in the raw rubber to form a compound. After the compound is taken out, the residual rubber adhering to the rotor is usually cleaned manually before the next batch is processed.

[0004] However, manually cleaning residual adhesive from the internal mixer rotor is inefficient and results in poor cleanliness, which can easily lead to batch-to-batch cross-contamination. Summary of the Invention

[0005] To improve cleaning efficiency and cleaning effect, the present invention provides a control method and apparatus for a rubber internal mixer.

[0006] Firstly, the present invention provides a control method for a rubber internal mixer, which adopts the following technical solution: A method for controlling a rubber internal mixer includes: Step S10: In response to the start signal, acquire product information and mixing information; Step S11: Determine the amount of operating oil to be added based on the product information and inject the operating oil based on the amount of operating oil to be added; Step S12: Determine the amount of cleaning oil based on the product information and mixing information; Step S13: Collect the processing temperature based on the preset temperature measurement points and determine whether the stirring is uniform based on the processing temperature; Step S14: If so, complete the mixing and inject the operating oil based on the amount of clean oil; Step S15: Execute the preset rotation command to rotate and clean the inside of the equipment, and then drain the operating oil; Step S16: Collect the amount of oil discharged and the cleaning temperature, and determine whether the cleaning is complete based on the cleaning temperature; Step S17: If so, determine the amount of residual oil based on the amount of oil discharged, the amount of cleaning oil, and the cleaning temperature; Step S18: Adjust the amount of operating oil to be added in the next batch based on the amount of residual oil.

[0007] By adopting the above technical solution, the actual temperature collected by the preset temperature measuring points on the rotor is used to determine the degree of mixing completion during the processing. Then, the mixing chamber is rinsed with operating oil, which reduces the cleaning time and difficulty after each processing. At the same time, the actual temperature collected during the cleaning process is used to determine the degree of cleaning completion and determine the residual amount of operating oil in the mixing chamber, thereby correcting the amount of operating oil added in the next batch. This realizes the secondary use of operating oil and reduces the probability of excessive operating oil.

[0008] Optionally, methods for determining whether the mixing is uniform include: Step S20: Obtain temperature fluctuation information based on temperature measurement points within a preset unit time, and calculate the average temperature based on the processing temperature; Step S21: Select valid temperature measurement points from the temperature measurement points by combining processing temperature, temperature fluctuation information, and average temperature. Step S22: Update the average temperature based on the processing temperature corresponding to the effective points and calculate the temperature deviation; Step S23: If the temperature difference is not greater than the preset difference threshold, then it is determined that the mixture is uniform; Step S240: If the temperature deviation is greater than the deviation threshold, it is determined that the mixture is not uniform, and the deviation coefficient is calculated based on the temperature deviation and the deviation threshold. Step S241: Correct the stirring speed in the stirring information based on the deviation coefficient.

[0009] By adopting the above technical solution, the data is initially screened using temperature fluctuation information and temperature average, and then the temperature deviation is used as the judgment index to determine the degree of uniformity of mixing. For cases of non-uniformity, the stirring speed is corrected by the deviation coefficient, which further improves the processing efficiency of mixing.

[0010] Optional methods for obtaining temperature fluctuation information include: Step S30: Generate acceleration instructions based on product information; Step S31: Execute the speed-up command and collect the speed-up temperature during the speed-up process based on the preset speed-up time node; Step S32: Construct a temperature curve based on the acceleration time node and acceleration temperature; Step S33: Determine the theoretical curve based on the acceleration command and product information; Step S34: Determine the cooling effect component by combining the temperature curve and the theoretical curve; Step S35: Determine temperature fluctuation information based on the cooling effect component and temperature curve.

[0011] By adopting the above technical solution, the rotor speed is adjusted by speed-up command, and the temperature is collected simultaneously to obtain the temperature change. A comparison model between the temperature curve and the theoretical curve is constructed to separate the cooling influence component, reduce the temperature fluctuation caused by the fluctuation of cooling water flow, and thus determine the true temperature fluctuation characteristics.

[0012] Optional methods for selecting valid locations include: Step S40: Collect the running time of the internal mixer during processing; Step S41: Determine the temperature threshold and average threshold corresponding to the running time based on the stirring information; Step S42: Define the temperature measurement points corresponding to the processing temperature being lower than the temperature threshold and the temperature fluctuation information being greater than the preset fluctuation threshold as abnormal points; Step S43: Calculate the average abnormal temperature based on the abnormal location, combined with the running time and processing temperature; Step S44: Define the period when the average abnormal temperature is less than the average threshold as an abnormal period; Step S45: Determine the anomaly ratio by combining the abnormal time period and runtime; Step S46: Filter out the abnormal points corresponding to the abnormal ratios that are greater than the preset ratio thresholds and define the remaining temperature measurement points as valid points.

[0013] By adopting the above technical solution and combining the running time, abnormal points are screened based on processing temperature and temperature fluctuation information. The abnormal ratio during abnormal periods is used to further determine the points corresponding to material shortage anomalies. When a material shortage anomaly occurs, the temperature measurement point is removed and other temperature measurement points are used as valid points, thereby reducing the impact of material shortage on the overall temperature uniformity.

[0014] Optional methods for valid point verification include: Step S50: Determine the basic cooling coefficient corresponding to the temperature measurement point based on the stirring information; Step S51: Determine the fluctuation deviation by combining temperature fluctuation information and fluctuation threshold; Step S52: Determine the cooling coefficient based on the fluctuation deviation, fluctuation threshold, and cooling baseline coefficient; Step S53: Correct the cooling effect component using the cooling coefficient and simultaneously correct the temperature fluctuation information; Step S54: Re-determine the valid points based on the corrected temperature fluctuation information.

[0015] By adopting the above technical solution, the cooling base coefficient is calculated by combining the cooling water parameters in the stirring information, and the cooling influence component is corrected by correlating the fluctuation deviation. In this way, the temperature fluctuation information and effective points are updated, reducing the impact of the difference in cooling effect caused by the continuous heat absorption during the cooling water flow.

[0016] Optionally, methods for determining whether cleaning is complete include: Step S60: Generate an increase command based on the preset cooling water flow rate; Step S61: Execute the speed-up command and collect the speed-up temperature corresponding to the temperature measurement point until the speed-up temperature remains stable, and simultaneously obtain the response time; Step S62: Determine the temperature change by combining the acceleration temperature and the cleaning temperature; Step S63: Calculate the average change and average time based on the temperature change and response time of all temperature measurement points; Step S64: Define the temperature measurement points where the temperature change is less than the average change and the response time is greater than the average time as residual points. Step S65: If there are no residual points, it is determined that the cleaning is complete.

[0017] By adopting the above technical solution, the cooling water flow rate is adjusted by speed-up commands and the real-time temperature is collected simultaneously. The residual points are identified by the temperature change and response time. The presence or absence of residual points determines whether the cleaning is complete. Compared with traditional manual detection, this method is more efficient and accurate.

[0018] Optionally, methods for determining the amount of residual oil based on the cleaning temperature include: Step S70: Calculate the initial residual amount based on the difference between the amount of cleaning oil and the amount of discharged oil; Step S71: Determine the oil film coverage based on the initial residual amount, product information, and stirring information; Step S72: Determine the oil film thickness based on the temperature change; Step S73: Retrieve the inner wall area from the stirring information and determine the coverage area in conjunction with the rotation command; Step S74: Determine the desired amount of oil film based on product information, coverage area, and oil film thickness; Step S75: If the absolute difference between the planned oil film amount and the oil film coverage amount is less than the preset error threshold, then the initial residual amount is taken as the residual oil amount. Step S76: If the absolute difference between the proposed oil film amount and the oil film coverage amount is not less than the error threshold, then calculate the average coverage amount of the proposed oil film amount and the oil film coverage amount and match the corresponding residual oil amount.

[0019] By adopting the above technical solution, the initial residual amount and its corresponding oil film coverage are first obtained by the difference between the clean oil amount and the discharged oil amount. Then, the oil film thickness is calculated by using the temperature change, and the proposed oil film amount is obtained by combining the coverage area. The oil film coverage and the proposed oil film amount are compared to determine whether the data of the initial residual amount is accurate. Based on different determination results, different data are used as the residual oil amount, thereby improving the calculation accuracy of the residual oil amount.

[0020] Optional, also includes: Step S80: If residual points exist, determine the distribution type based on the residual points; Step S81: Determine the cleaning plan based on the distribution type and stirring information; Step S82: Generate cleaning instructions based on residual locations and cleaning plans; Step S83: After completing the cleaning command, re-determine whether the cleaning is complete.

[0021] By adopting the above technical solutions, differentiated cleaning schemes are matched according to the distribution type of residual points, avoiding the waste of resources caused by blindly cleaning the whole machine. After cleaning, the cleanliness is re-evaluated to ensure that the mixing chamber meets production requirements, effectively reducing the risk of cross-contamination between batches and improving product quality stability.

[0022] Secondly, this application provides a rubber internal mixer, which adopts the following technical solution: A rubber internal mixer, and a control method for a rubber internal mixer according to the first aspect, includes a mixing body, wherein the mixing body is further equipped with a pressing device for forced pressing, a mixing device for feeding rubber materials for internal mixing, a rotating device for driving the mixing device to open and close, and a driving device for driving the mixing device to operate. The mixing apparatus includes a mixing chamber for containing rubber raw materials and multiple rotors rotatably mounted in the mixing chamber for stirring, shearing, and mixing the rubber raw materials and compounding agents. The mixing chamber is rotatably mounted on the mixing body.

[0023] By adopting the above technical solution, the mixing chamber provides a closed mixing space for materials. The rotation of the rotor realizes the stirring, shearing and mixing of rubber raw materials and compounding agents. The control of the mixing chamber by the drive device facilitates the switching of the mixing chamber in loading and unloading and processing states, and improves the operation and portability of the equipment.

[0024] Optionally, the pressing device includes an upper bolt for pressing the rubber raw material in the mixing chamber and a lifting structure for driving the upper bolt closer to or away from the mixing chamber. Multiple drive devices are provided, and each drive device corresponds to a rotor and drives the corresponding rotor to rotate.

[0025] By adopting the above technical solution, the top bolt can force the material into the working area of ​​the rotor, reducing the situation of material slippage. Multiple drive devices correspond one-to-one with the rotor, which can realize independent speed regulation and direction control of the rotor, realize differential speed mixing, and improve the equipment's operating load capacity.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: By using the actual temperature collected at preset temperature measurement points on the rotor, the degree of mixing completion is determined during the processing. Then, the mixing chamber is rinsed with operating oil, which reduces the cleaning time and difficulty after each processing. At the same time, the actual temperature collected during the cleaning process is used to determine the degree of cleaning completion and the amount of operating oil remaining in the mixing chamber, thereby correcting the amount of operating oil added in the next batch. This realizes the secondary use of operating oil and reduces the probability of excessive operating oil. By combining the cooling water parameters in the stirring information to calculate the basic cooling coefficient, and correlating the fluctuation deviation to correct the cooling influence component, the temperature fluctuation information and effective points are updated, thereby reducing the impact of differences in cooling effect caused by continuous heat absorption during the cooling water flow process. The mixing chamber provides a closed mixing space for materials. The rotation of the rotor realizes the stirring, shearing and mixing of rubber raw materials and compounding agents. The control of the mixing chamber by the drive device facilitates the switching of the mixing chamber in loading and unloading and processing states, improving the operation and portability of the equipment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a rubber internal mixer according to this application; Figure 2 This is a cross-sectional view of a rubber mixer according to this application.

[0028] The parts referred to by the numbers in the above attached figures are as follows: 1. Mixing body; 2. Pressing device; 21. Top bolt; 22. Lifting structure; 3. Mixing device; 31. Mixing chamber; 32. Rotor; 4. Rotating device; 5. Drive device. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This invention discloses a rubber internal mixer.

[0031] Reference Figure 1 and Figure 2 A rubber internal mixer includes a mixing body 1, a pressing device 2, a mixing device 3, a rotating device 4, and a driving device 5.

[0032] The pressing device 2 includes an upper top bolt 21 and a lifting structure 22. The lifting structure 22 is a hydraulic cylinder, which is fixedly installed on the mixing body 1. The output end of the hydraulic cylinder is fixedly connected to the upper top bolt 21. The hydraulic cylinder is used to drive the upper top bolt 21 to move up and down in the vertical direction to approach or move away from the mixing device 3. When the upper top bolt 21 approaches the mixing device 3, it applies pressure to the rubber raw material in the mixing device 3 to force pressing.

[0033] The mixing device 3 includes a mixing chamber 31 and a rotor 32. The mixing chamber 31 is rotatably mounted on the mixing body 1 and is used to contain rubber raw materials. Two rotors 32 are provided and rotatably mounted inside the mixing chamber 31 for stirring, shearing and mixing rubber raw materials and compounding agents. The mixing chamber 31 is driven to rotate by the rotating device 4. When the opening of the mixing chamber 31 faces upward, it cooperates with the mixing body 1 and the top bolt 21 to form a sealed chamber. When the opening of the mixing chamber 31 faces forward, it facilitates the input and output of raw materials.

[0034] Two rotating devices 4 are provided and symmetrically arranged on both sides of the mixing chamber 31. The rotating devices 4 are cylinders, which are rotatably mounted on the mixing body 1. The output end of the cylinder is rotatably connected to the mixing chamber 31 to drive the mixing chamber 31 to rotate.

[0035] There are two drive devices 5. The drive devices 5 are motors, and the motors are set one-to-one with the rotors 32. The output end of the motor is fixedly connected to the rotor 32 to drive the corresponding rotor 32 to rotate.

[0036] The rotating device 4 is started to drive the mixing chamber 31 to rotate so that the opening of the mixing chamber 31 faces forward. Rubber raw materials and compounding agents are put into the inside of the mixing chamber 31. The rotating device 4 is then used to drive the opening of the mixing chamber 31 to face upward so as to form a sealed chamber with the mixing body 1. The control cylinder drives the upper top bolt 21 to approach the rotor 32 to press the rubber raw materials. The drive device 5 is started to drive the rotor 32 to rotate so as to stir, shear and mix the rubber raw materials and compounding agents. After the mixture is evenly mixed, the upper top bolt 21 is controlled to reset and the opening of the mixing chamber 31 is driven to face forward so as to take out the rubber product.

[0037] Based on the same inventive concept, embodiments of the present invention provide a control method for a rubber internal mixer.

[0038] A method for controlling a rubber internal mixer includes the following steps: Step S10: In response to the start signal, obtain product information and stirring information.

[0039] The start signal is the trigger command that initiates the internal mixer to enter a new batch of mixing process; the operator issues the command through the start button on the internal mixer control panel.

[0040] Before responding to the start signal, the internal mixer is in a standby state, and rubber raw materials and various compounding agents have been added inside.

[0041] Product information refers to the formula and performance parameters of the rubber products to be mixed, including parameters such as raw rubber quality, rubber type, and formula ratio. The product information is entered into the system in advance by the operator according to the production work order, and can be retrieved directly when in use.

[0042] The mixing information refers to the equipment operating parameters and structural parameters of the internal mixer, including operating parameters such as mixing speed, mixing time, and cooling water flow rate, as well as structural parameters such as rotor size, mixing chamber size, and inner wall area. The mixing information is entered into the system in advance by the operator according to the production work order, and can be retrieved directly when in use.

[0043] Step S11: Determine the amount of operating oil to be added based on the product information and inject the operating oil based on the amount of operating oil to be added.

[0044] The amount of processing oil added refers to the amount of processing oil injected into the internal mixer to improve the plasticity of the rubber and reduce the viscosity of the internal mixing. The raw rubber quality and type are retrieved from the product information. Based on the raw rubber quality and type, the corresponding amount of processing oil is found in the processing oil correspondence table. The processing oil correspondence table is a data table that records different raw rubber qualities and types and their corresponding processing oil addition amounts. It is obtained by technicians through pre-testing and will not be elaborated here. The greater the raw rubber quality and the greater the viscosity of the rubber type, the greater the amount of processing oil added. Based on the amount of processing oil added, the processing oil is injected into the internal mixing chamber 31 through the oil injection port preset inside the mixing chamber 31 for mixing and internal mixing.

[0045] Step S12: Determine the amount of cleaning oil based on the product information and mixing information.

[0046] The amount of cleaning oil refers to the amount of processing oil added after the mixing process to clean the residual rubber material in the mixing chamber 31. The raw rubber quality and type are retrieved from the product information. The corresponding base oil amount is then found from the processing oil correspondence table based on the raw rubber quality and type. The mixing volume is retrieved from the mixing information. The corresponding correction coefficient is matched from the correction correspondence table based on the mixing volume. The correction correspondence table is a data table that records different mixing volumes and their corresponding correction coefficients. It is obtained by the technicians through pre-testing and will not be elaborated here. The amount of cleaning oil is obtained by multiplying the correction coefficient and the base oil amount.

[0047] Step S13: Collect the processing temperature based on the preset temperature measurement points and determine whether the stirring is uniform based on the processing temperature.

[0048] Temperature measurement points refer to the installation positions of temperature sensors that are pre-arranged in the critical areas of rotor 32. When the internal mixer leaves the factory, sensor installation points, i.e. temperature measurement points, are pre-set in the critical areas of rotor 32 according to the grid distribution principle.

[0049] Processing temperature refers to the real-time material temperature collected at various temperature measurement points during the mixing process. The processing temperature is obtained by collecting temperature data at preset time intervals using temperature sensors placed at each temperature measurement point.

[0050] Step S14: If so, complete the mixing and inject the operating oil based on the clean oil volume.

[0051] If the mixture is stirred evenly, the rubber product after mixing is taken out of the mixing chamber 31. Then, based on the amount of clean oil, the processing oil is injected into the mixing chamber 31 through the oil inlet. The processing oil injected at this time is exactly the same as the processing oil used during mixing.

[0052] If the mixture is not thoroughly mixed, the rotational speed of rotor 32 needs to be further controlled to improve the mixing efficiency. The specific control steps will be disclosed in detail in subsequent steps and will not be repeated here.

[0053] Step S15: Execute the preset rotation command to rotate and clean the inside of the equipment, and then drain the operating oil.

[0054] The rotation command refers to the command to drive the rotor 32 to run after the cleaning oil is injected into the operating oil. The centrifugal force drives the operating oil to flush the residual rubber material, and at the same time, the operating oil can be evenly covered on the inner wall of the mixing chamber 31 and the outer side of the rotor 32. According to the cleaning process requirements, the rotor speed, rotation time, direction mode and other parameter combinations are preset to generate standardized rotation commands, which are pre-entered into the system by the operator.

[0055] Step S16: Collect the amount of oil discharged and the cleaning temperature, and determine whether the cleaning is complete based on the cleaning temperature.

[0056] The amount of oil discharged refers to the mass of the operating oil discharged from the mixing chamber 31 after the rotation command is executed. The waste oil discharged from the mixing chamber 31 is filtered to obtain relatively pure operating oil. The operating oil is weighed to obtain the amount of oil discharged. The operating oil can also be further filtered for reuse.

[0057] The cleaning temperature refers to the actual temperature collected at each temperature measuring point after cleaning is completed and the rotor 32 stops running. After cleaning is completed, the rotor 32 is kept stationary, the mixing chamber 31 is sealed and left to stand for a preset time, and the temperature collected by the temperature sensors at each temperature measuring point is the cleaning temperature.

[0058] Step S17: If so, determine the amount of residual oil based on the amount of oil discharged, the amount of cleaning oil, and the cleaning temperature.

[0059] The amount of residual oil refers to the total amount of processing oil adhering to the inner wall of the mixing chamber 31 and remaining at the bottom of the mixing chamber 31 after cleaning; the specific determination method will be disclosed in detail in subsequent steps, and will not be repeated here.

[0060] If the cleaning is not complete, further cleaning is required. The specific cleaning methods will be detailed in subsequent steps and will not be elaborated here.

[0061] Step S18: Adjust the amount of operating oil to be added in the next batch based on the amount of residual oil.

[0062] Based on the amount of residual oil, the corresponding amount of processing oil added in the next batch is reduced, and the processing oil remaining in the mixing chamber 31 can be directly used for the mixing of the next batch.

[0063] The method for determining whether the mixing is uniform includes the following steps: Step S20: Obtain temperature fluctuation information based on temperature measurement points within a preset unit time, and calculate the average temperature based on the processing temperature.

[0064] Unit time refers to a fixed time interval pre-calibrated for collecting temperature fluctuation information. It is a time measurement benchmark used to statistically analyze the temperature change difference within the same temperature measurement point. The unit time is pre-entered into the system by the operator based on the process characteristics of rubber mixing, the plasticization requirements of rubber types, and the temperature acquisition frequency.

[0065] Temperature fluctuation information refers to the difference between the processing temperature collected later and the processing temperature collected earlier at the same temperature measurement point within a unit of time; the specific acquisition method will be disclosed in detail in subsequent steps, and will not be repeated here.

[0066] The average temperature refers to the arithmetic mean of the processing temperatures collected at various temperature measurement points at the same time. The average temperature is obtained by summing the processing temperatures collected at all temperature measurement points at the same time and then dividing by the total number of temperature measurement points.

[0067] Step S21: Select valid temperature measurement points from the temperature measurement points by combining processing temperature, temperature fluctuation information and average temperature.

[0068] Valid points refer to points selected from all temperature measurement points that provide reliable temperature data; the specific selection method will be disclosed in detail in subsequent steps and will not be repeated here.

[0069] Step S22: Update the average temperature based on the processing temperature corresponding to the effective points and calculate the temperature deviation.

[0070] The average temperature is recalculated based on the processing temperature corresponding to the effective points to correct the original average temperature.

[0071] Temperature deviation refers to the average of the sum of squares of the deviations between the processing temperature of each effective point and the corrected mean temperature. The temperature deviation is calculated by averaging the sum of squares of the deviations between the processing temperature of each effective point and the corrected mean temperature.

[0072] Step S23: If the temperature difference is not greater than the preset difference threshold, then it is determined that the mixture is uniform.

[0073] The deviation threshold refers to the critical value of the temperature deviation that has been pre-calibrated. Through multiple batches of intensive mixing experiments, the temperature deviation range when the material is mixed evenly is determined, and the upper limit of the range is taken as the deviation threshold, which is pre-entered into the system by the operator.

[0074] A temperature deviation not exceeding the deviation threshold indicates that the material temperature in different areas of the mixing chamber 31 is well consistent, and the rubber raw materials and compounding agents have been fully dispersed and plasticized, meeting the preset mixing quality requirements.

[0075] Step S240: If the temperature deviation is greater than the deviation threshold, it is determined that the mixture is not uniform, and the deviation coefficient is calculated based on the temperature deviation and the deviation threshold.

[0076] A temperature deviation greater than the deviation threshold indicates that there are localized overheating or unplasticized areas in the material within the mixing chamber 31, and the mixing uniformity is not up to standard. The stirring parameters need to be adjusted to improve the mixing effect.

[0077] The deviation coefficient is the ratio of the actual temperature deviation to the deviation threshold, reflecting the degree of deviation in the uniformity of mixing. The deviation coefficient is obtained by quotienting the temperature deviation and the deviation threshold.

[0078] Step S241: Correct the stirring speed in the stirring information based on the deviation coefficient.

[0079] The stirring speed refers to the actual operating speed of rotor 32 during the internal mixer's internal mixing process; the stirring speed is obtained directly from the stirring information.

[0080] The deviation coefficient is multiplied by the stirring speed to calculate and correct the new stirring speed.

[0081] The method for obtaining temperature fluctuation information includes the following steps: Step S30: Generate acceleration instructions based on product information.

[0082] The speed-up command refers to the control command that drives the rotor 32 to increase its speed in order to measure the temperature fluctuation characteristics. It includes the increased speed value and the duration of the speed-up process. The plasticizing characteristics of the rubber type are retrieved from the product information. Based on the plasticizing characteristics of the rubber type, the corresponding speed-up command is retrieved from the speed-up correspondence table. The speed-up correspondence table is a data table that records the plasticizing characteristics of different rubber types and their corresponding speed-up commands. It is obtained by the technicians through prior testing and will not be described in detail here.

[0083] Step S31: Execute the speed-up command and collect the speed-up temperature during the speed-up process based on the preset speed-up time node.

[0084] The acceleration time node refers to the time point obtained sequentially at a set time interval during the execution of the acceleration command, which is used to collect temperature data of different durations. The acceleration command presets the time node, which is set to 5 seconds in this embodiment. Starting from the execution of the acceleration command, continuous time nodes are obtained at 5-second intervals, which are the acceleration time nodes.

[0085] Acceleration temperature refers to the actual temperature collected at each temperature measurement point based on each acceleration time node; at each acceleration time node, the temperature sensors at each temperature measurement point are triggered and temperature data is collected synchronously, which is the acceleration temperature.

[0086] Step S32: Construct a temperature curve based on the acceleration time node and acceleration temperature.

[0087] A temperature curve is a curve plotted with acceleration time as the horizontal axis and acceleration temperature as the vertical axis, which intuitively reflects the dynamic trend of temperature change during acceleration. A temperature curve is plotted with time as the horizontal axis and temperature as the vertical axis using data visualization tools.

[0088] Step S33: Determine the theoretical curve based on the speed-up command and product information.

[0089] The theoretical curve refers to the theoretical trend curve of temperature change calculated by a thermodynamic model based on product information and mixing information. Based on the thermodynamic equations of shear heat generation and cooling water heat transfer in rubber compounding, a theoretical model of temperature change is constructed. The product information and mixing information are substituted into the model to calculate the theoretical temperature at different time points and plot the theoretical curve.

[0090] Step S34: Determine the cooling effect component by combining the temperature curve and the theoretical curve.

[0091] The cooling effect component refers to the temperature fluctuation amplitude caused by the fluctuation of cooling water flow rate during temperature changes. At the same time point, the temperature difference between the actual temperature curve and the theoretical curve is calculated. The curve segment corresponding to the temperature difference that exceeds the preset difference threshold is defined as the cooling effect segment, and the temperature difference of the cooling effect segment is the cooling effect component.

[0092] The difference threshold is the threshold for determining whether a temperature difference is a cooling disturbance. To keep the process parameters of the internal mixer stable, only the cooling water flow rate is manually adjusted to simulate different flow rate fluctuations and obtain the temperature difference. The average of the minimum temperature difference under each condition is used as the difference threshold.

[0093] Step S35: Determine temperature fluctuation information based on the cooling effect component and temperature curve.

[0094] Remove the cooling-affected segment from the temperature curve, and calculate the average temperature difference per unit time at the same temperature measurement point in the remaining curve segment as the temperature fluctuation information at that point.

[0095] The method for selecting effective locations includes the following steps: Step S40: Collect the running time of the internal mixer during processing.

[0096] Running time refers to the cumulative time from the start of internal mixer operation to the current moment; starting from the moment the start signal is triggered, the cumulative running time is counted in real time by a preset timer, which is the running time.

[0097] Step S41: Determine the temperature threshold and average threshold corresponding to the running time based on the stirring information.

[0098] Temperature threshold refers to the preset critical temperature value for different stages of internal mixing. If the temperature is lower than this value, it means that the material has not reached the plasticizing temperature. Through plasticizing experiments of different types of rubber, the minimum plasticizing temperature of each mixing stage is determined as the temperature threshold corresponding to the running time, thus forming a threshold correspondence table. The corresponding temperature threshold is retrieved from the threshold correspondence table according to the stirring information and running time.

[0099] The mean threshold is the critical temperature mean used to determine whether the degree of abnormality at a temperature measurement point belongs to a systematic deviation. A mixing experiment is conducted using materials that are consistent with the target rubber type and formula. Typical abnormal working conditions are artificially created, and the temperature mean of the abnormal point is recorded under each abnormal working condition. The lowest temperature mean corresponding to different abnormal types is statistically analyzed, which is the mean threshold. This is then integrated into a threshold correspondence table. The corresponding mean threshold is retrieved from the threshold correspondence table based on the stirring information and running time.

[0100] Step S42: Define the temperature measurement points corresponding to the processing temperature being lower than the temperature threshold and the temperature fluctuation information being greater than the preset fluctuation threshold as abnormal points.

[0101] The fluctuation threshold refers to the critical value of pre-defined temperature fluctuation information. Exceeding this value indicates poor temperature stability at the corresponding point.

[0102] Abnormal points refer to points among the temperature measurement points that show abnormalities, indicating that the location has been in a state of insufficient adhesive for an extended period of time; the specific determination method will be disclosed in detail in subsequent steps, and will not be repeated here.

[0103] Step S43: Calculate the average abnormal temperature based on the abnormal location, combined with the running time and processing temperature.

[0104] The average abnormal temperature refers to the arithmetic mean of the processing temperatures collected at abnormal points during abnormal periods. It is used to determine the degree of deviation at abnormal points. The average abnormal temperature is obtained by summing the processing temperatures at abnormal points during that period and dividing by the number of data collections.

[0105] Step S44: Define the period when the average abnormal temperature is less than the average threshold as an abnormal period.

[0106] An abnormal period refers to a time interval in which the average abnormal temperature is less than the average threshold. The processing temperature data of the abnormal points is extracted, and continuous time intervals in which the average temperature is less than the average threshold are selected. Adjacent small time intervals are merged to obtain a complete abnormal period. Small time intervals are multiple discontinuous intervals with small intervals. The specific determination method is preset by the operator and entered into the system.

[0107] Step S45: Determine the anomaly ratio by combining the abnormal time period and runtime.

[0108] The anomaly ratio is the ratio of the abnormal period to the running time, reflecting the degree of deviation of the abnormal location; the anomaly ratio is obtained by quotienting the total duration of the abnormal period to the running time.

[0109] Step S46: Filter out the abnormal points corresponding to the abnormal ratios that are greater than the preset ratio thresholds and define the remaining temperature measurement points as valid points.

[0110] The ratio threshold refers to the pre-calibrated critical value of the abnormal ratio. An abnormal ratio greater than this value indicates that the corresponding temperature measurement point has been in an abnormal state for a long time, which is one of the bases for judging glue shortage. Through multiple batch experiments, the maximum acceptable deviation duration ratio of the abnormal point is determined and used as the ratio threshold, which is pre-entered into the system by the operator.

[0111] The method for verifying valid locations includes the following steps: Step S50: Determine the basic cooling coefficient corresponding to the temperature measurement point based on the stirring information.

[0112] The cooling baseline coefficient refers to the basic value of cooling efficiency calculated based on the cooling water flow rate and rotor structure in the mixing information. It reflects the degree of influence of cooling water on the temperature of different temperature measurement points. The cooling baseline coefficient is higher for temperature measurement points closer to the cooling water inlet. As the cooling water flows through and absorbs some heat, the cooling baseline coefficient decreases for temperature measurement points farther from the cooling water inlet, and the rate of decrease remains constant. The distance between each temperature measurement point and the cooling water inlet is retrieved from the mixing information. The corresponding cooling baseline coefficient is then looked up from the coefficient correspondence table based on the distance and cooling water flow rate. The coefficient correspondence table records different distances and cooling water flow rates and their corresponding cooling baseline coefficients. It is obtained from pre-test records by technicians and will not be elaborated upon here.

[0113] Step S51: Determine the fluctuation deviation by combining temperature fluctuation information and fluctuation threshold.

[0114] Fluctuation deviation refers to the difference between temperature fluctuation information and fluctuation threshold, reflecting the degree of deviation of temperature fluctuation; fluctuation deviation is calculated by subtracting temperature fluctuation information from fluctuation threshold.

[0115] Step S52: Determine the cooling coefficient based on the fluctuation deviation, fluctuation threshold, and cooling baseline coefficient.

[0116] The cooling coefficient is a correction coefficient calculated from the basic cooling coefficient and the fluctuation deviation. It is used to quantify the impact of cooling factors on temperature fluctuation information. It is calculated according to the formula: Cooling coefficient = Basic cooling coefficient × (1 + Fluctuation deviation ÷ Fluctuation threshold).

[0117] Step S53: Correct the cooling effect component by adjusting the cooling coefficient and simultaneously correct the temperature fluctuation information.

[0118] A new cooling influence component is obtained by combining the cooling coefficient and the cooling influence component. The new cooling influence component is then substituted into step S35 above to correct the temperature fluctuation information.

[0119] Step S54: Re-determine the valid points based on the corrected temperature fluctuation information.

[0120] Based on the corrected temperature fluctuation information, the data is substituted into steps S40 to S46 to recalculate and obtain new valid points.

[0121] The method for determining whether a cleaning is complete includes the following steps: Step S60: Generate an increase command based on the preset cooling water flow rate.

[0122] Cooling water flow rate refers to the circulating flow rate of cooling water in the cooling water channel set inside the rotor 32 during the cleaning stage; the cooling water flow rate is obtained in real time by a flow meter preset in the cooling water channel.

[0123] The speed-up command is a control command that increases the flow rate of cooling water to determine whether the surface of rotor 32 is clean. It includes the increased flow rate value and the duration of the speed-up process. The corresponding speed-up command is retrieved from the speed-up correspondence table based on the cooling water flow rate. The speed-up correspondence table is a data table that records different cooling water flow rates and their corresponding speed-up commands. It is obtained by technicians through prior testing and will not be described in detail here.

[0124] Step S61: Execute the speed-up command and collect the speed-up temperature corresponding to the temperature measurement point until the speed-up temperature remains stable, and simultaneously obtain the response time.

[0125] The acceleration temperature refers to the real-time temperature collected at each temperature measurement point during the execution of the acceleration command; the acceleration temperature is obtained by collecting temperature data at preset time intervals through temperature sensors placed at each temperature measurement point.

[0126] Response time refers to the time it takes for the temperature at the measuring point to change from its initial value to a stable value after the speed-up command is executed. Starting from the moment the speed-up command is triggered, the time is recorded until the temperature fluctuation during the speed-up process does not exceed 0.2℃. This time period is the response time.

[0127] Step S62: Determine the temperature change by combining the acceleration temperature and the cleaning temperature.

[0128] Temperature change refers to the temperature difference at the same temperature measurement point before and after a change in cooling water flow rate, reflecting the degree of influence of cooling water flow rate on temperature; the temperature change is obtained by calculating the difference between the cleaning temperature and the speed-up temperature.

[0129] Step S63: Calculate the average change and average time based on the temperature change and response time of all temperature measurement points.

[0130] The average change refers to the arithmetic mean of the temperature changes at all temperature measurement points. The average change is obtained by collecting the temperature change data of all temperature measurement points, summing the results, and then calculating the quotient between the sum and the total number of temperature measurement points.

[0131] The average time is the arithmetic mean of the response times of all temperature measurement points. The average time is obtained by collecting the response time data of all temperature measurement points, summing the results, and then calculating the quotient between the sum and the total number of temperature measurement points.

[0132] Step S64: Define the temperature measurement points where the temperature change is less than the average change and the response time is greater than the average time as residual points.

[0133] Residual points refer to points where the temperature change and response time are abnormal, indicating the presence of residual adhesive at that location. By comparing the temperature change and response time of each temperature measurement point with the average change and the average time, points that simultaneously meet the criteria of "temperature change less than average change" and "response time greater than average time" are identified as residual points.

[0134] Step S65: If there are no residual points, it is determined that the cleaning is complete.

[0135] If there are no residual points, that is, no residual adhesive is detected at any of the temperature measurement points, it means that the outside of rotor 32 has been cleaned.

[0136] Methods for determining residual oil content based on cleaning temperature include: Step S70: Calculate the initial residual amount based on the difference between the amount of clean oil and the amount of discharged oil.

[0137] The initial residual amount refers to the amount of oil remaining in the mixing chamber 31 as initially calculated based on the amount of clean oil and the amount of discharged oil; the initial residual amount is obtained by calculating the difference between the amount of clean oil and the amount of discharged oil.

[0138] Step S71: Determine the oil film coverage based on the initial residual amount, product information, and stirring information.

[0139] Oil film coverage refers to the total amount of operating oil adhering to the inner walls of rotor 32 and mixing chamber 31, obtained by matching the initial residual amount with the stirring information. The operating oil parameters are retrieved from the product information, and the mixing chamber structural parameters are retrieved from the stirring information. Through multiple experiments, the amount of oil dripping after a preset standing time is collected based on different total oil amounts. An oil correspondence table is established by combining the total oil amount and the amount of oil dripping. The corresponding amount of oil dripping is retrieved from the oil correspondence table based on the initial residual amount. The oil film coverage is calculated by subtracting the initial residual amount from the amount of oil dripping.

[0140] Step S72: Determine the oil film thickness based on the temperature change.

[0141] Oil film thickness refers to the average thickness of the oil film adhering to the inner wall of the mixing chamber 31 and the surface of the rotor 32. Through gradient oil film thickness experiments, a nonlinear correlation model between temperature change and oil film thickness is established. The measured temperature change is substituted into the correlation model to obtain the oil film thickness.

[0142] Step S73: Retrieve the inner wall area from the stirring information and determine the coverage area in conjunction with the rotation command.

[0143] The inner wall area refers to the total inner wall area of ​​the mixing chamber 31, including the area of ​​the side walls, end caps, etc. It is necessary to exclude the dead corner area that the rotor 32 cannot sweep. The chamber structure parameters are retrieved from the mixing machine equipment drawings, the total inner wall area is calculated by geometric formula, and then the dead corner area that the rotor 32 cannot sweep is measured and subtracted from the total inner wall area to obtain the inner wall area, which is then integrated into the mixing information and retrieved directly when needed.

[0144] Coverage area refers to the actual inner wall area to which the oil film adheres. The coverage area is obtained by multiplying the oil film coverage efficiency coefficient corresponding to different rotation commands by experimental calibration and matching the rotation commands with the inner wall area.

[0145] Step S74: Determine the desired amount of oil film based on product information, coverage area, and oil film thickness.

[0146] The proposed oil film quantity refers to the actual mass of the oil film calculated by combining product information, coverage area, and oil film thickness; the operating oil density is retrieved from the product information, and the proposed oil film quantity is calculated by multiplying the coverage area, oil film thickness, and operating oil density.

[0147] Step S75: If the absolute difference between the planned oil film amount and the oil film coverage amount is less than the preset error threshold, then the initial residual amount is taken as the residual oil amount.

[0148] The absolute difference refers to the absolute value of the difference between the planned oil film quantity and the oil film coverage quantity; the absolute difference is calculated by taking the difference between the planned oil film quantity and the oil film coverage quantity and taking the absolute value of the result.

[0149] Error threshold refers to the pre-calibrated critical value of absolute difference, used to determine whether the initial residual amount is accurate. Through multiple batches of oil film testing experiments, the acceptable deviation range between the planned oil film amount and the oil film coverage is determined, and the upper limit value is taken as the error threshold.

[0150] An absolute difference less than the error threshold means that the difference between the intended oil film quantity and the oil film coverage is within the error range. In other words, the initial residual amount obtained by the difference between the cleaning oil quantity and the discharged oil quantity is accurate and can be directly used as the residual oil quantity.

[0151] Step S76: If the absolute difference between the proposed oil film amount and the oil film coverage amount is not less than the error threshold, then calculate the average coverage amount of the proposed oil film amount and the oil film coverage amount and match the corresponding residual oil amount.

[0152] An absolute difference not less than the error threshold indicates that the difference between the intended oil film quantity and the oil film coverage is not within the error range. In other words, the initial residual quantity obtained by the difference between the clean oil quantity and the discharged oil quantity is inaccurate and further calculation is needed to obtain the residual oil quantity.

[0153] Average coverage refers to the arithmetic mean of the planned oil film quantity and the oil film coverage quantity; the average coverage quantity is obtained by calculating the arithmetic mean of the planned oil film quantity and the oil film coverage quantity.

[0154] The corresponding residual oil amount can be retrieved from the residual correspondence table based on the average coverage. The residual correspondence table is a data table that records different average coverage and their corresponding residual oil amounts. It is obtained by technicians through pre-testing and will not be elaborated on here.

[0155] It also includes the following steps: Step S80: If residual points exist, determine the distribution type based on the residual points.

[0156] Distribution type refers to the distribution pattern of residual points on the surface of rotor 32. Based on the spatial location of the temperature measuring points, the specific distribution area of ​​the residual points on the inner wall of the cavity is determined. Distribution types include single-point isolated type, local cluster type, and global diffusion type. The operator pre-enters the characteristics corresponding to the distribution type into the system and matches them according to the specific distribution area to obtain the distribution type.

[0157] Step S81: Determine the cleaning plan based on the distribution type and stirring information.

[0158] A cleaning plan refers to a specific type of cleaning plan determined based on the distribution of residual points. Among them, isolated single-point types correspond to fixed-point flushing, localized cluster types correspond to area scraping, and whole-area diffuse types correspond to whole-machine circulation cleaning. The cleaning medium and cleaning time are adjusted according to the stirring information to obtain the corresponding cleaning plan.

[0159] Step S82: Generate cleaning instructions based on residual locations and cleaning plans.

[0160] A cleaning instruction is an equipment operation instruction generated for a residual location and its corresponding cleaning plan. The cleaning plan is executed in sequence according to the following order: whole machine circulation cleaning, corresponding area scraping, and corresponding fixed-point rinsing, thus forming a complete cleaning instruction.

[0161] Step S83: After completing the cleaning command, re-determine whether the cleaning is complete.

[0162] After the cleaning instruction is completed, rinse and execute steps S60 to S65 to re-determine whether the cleaning is clean.

[0163] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A control method for a rubber internal mixer, characterized in that, include: Step S10: In response to the start signal, acquire product information and mixing information; Step S11: Determine the amount of operating oil to be added based on the product information and inject the operating oil based on the amount of operating oil to be added; Step S12: Determine the amount of cleaning oil based on the product information and mixing information; Step S13: Collect the processing temperature based on the preset temperature measurement points and determine whether the stirring is uniform based on the processing temperature; Step S14: If so, complete the mixing and inject the operating oil based on the amount of clean oil; Step S15: Execute the preset rotation command to rotate and clean the inside of the equipment, and then drain the operating oil; Step S16: Collect the amount of oil discharged and the cleaning temperature, and determine whether the cleaning is complete based on the cleaning temperature; Step S17: If so, determine the amount of residual oil based on the amount of oil discharged, the amount of cleaning oil, and the cleaning temperature; Step S18: Adjust the amount of operating oil to be added in the next batch based on the amount of residual oil.

2. The control method for a rubber internal mixer according to claim 1, characterized in that, Methods for determining whether mixing is uniform include: Step S20: Obtain temperature fluctuation information based on temperature measurement points within a preset unit time, and calculate the average temperature based on the processing temperature; Step S21: Select valid temperature measurement points from the temperature measurement points by combining processing temperature, temperature fluctuation information, and average temperature. Step S22: Update the average temperature based on the processing temperature corresponding to the effective points and calculate the temperature deviation; Step S23: If the temperature difference is not greater than the preset difference threshold, then it is determined that the mixture is uniform; Step S240: If the temperature deviation is greater than the deviation threshold, it is determined that the mixture is not uniform, and the deviation coefficient is calculated based on the temperature deviation and the deviation threshold. Step S241: Correct the stirring speed in the stirring information based on the deviation coefficient.

3. The control method for a rubber internal mixer according to claim 2, characterized in that, Methods for obtaining temperature fluctuation information include: Step S30: Generate acceleration instructions based on product information; Step S31: Execute the speed-up command and collect the speed-up temperature during the speed-up process based on the preset speed-up time node; Step S32: Construct a temperature curve based on the acceleration time node and acceleration temperature; Step S33: Determine the theoretical curve based on the acceleration command and product information; Step S34: Determine the cooling effect component by combining the temperature curve and the theoretical curve; Step S35: Determine temperature fluctuation information based on the cooling effect component and temperature curve.

4. The control method for a rubber internal mixer according to claim 2, characterized in that, Methods for selecting effective locations include: Step S40: Collect the running time of the internal mixer during processing; Step S41: Determine the temperature threshold and average threshold corresponding to the running time based on the stirring information; Step S42: Define the temperature measurement points corresponding to the processing temperature being lower than the temperature threshold and the temperature fluctuation information being greater than the preset fluctuation threshold as abnormal points; Step S43: Calculate the average abnormal temperature based on the abnormal location, combined with the running time and processing temperature; Step S44: Define the period when the average abnormal temperature is less than the average threshold as an abnormal period; Step S45: Determine the anomaly ratio by combining the abnormal time period and runtime; Step S46: Filter out the abnormal points corresponding to the abnormal ratios that are greater than the preset ratio thresholds and define the remaining temperature measurement points as valid points.

5. The control method for a rubber internal mixer according to claim 4, characterized in that, The methods for verifying valid locations include: Step S50: Determine the basic cooling coefficient corresponding to the temperature measurement point based on the stirring information; Step S51: Determine the fluctuation deviation by combining temperature fluctuation information and fluctuation threshold; Step S52: Determine the cooling coefficient based on the fluctuation deviation, fluctuation threshold, and cooling baseline coefficient; Step S53: Correct the cooling effect component using the cooling coefficient and simultaneously correct the temperature fluctuation information; Step S54: Re-determine the valid points based on the corrected temperature fluctuation information.

6. The control method for a rubber internal mixer according to claim 1, characterized in that, Methods for determining whether a cleaning is complete include: Step S60: Generate an increase command based on the preset cooling water flow rate; Step S61: Execute the speed-up command and collect the speed-up temperature corresponding to the temperature measurement point until the speed-up temperature remains stable, and simultaneously obtain the response time; Step S62: Determine the temperature change by combining the acceleration temperature and the cleaning temperature; Step S63: Calculate the average change and average time based on the temperature change and response time of all temperature measurement points; Step S64: Define the temperature measurement points where the temperature change is less than the average change and the response time is greater than the average time as residual points. Step S65: If there are no residual points, it is determined that the cleaning is complete.

7. The control method for a rubber internal mixer according to claim 6, characterized in that, Methods for determining residual oil content based on cleaning temperature include: Step S70: Calculate the initial residual amount based on the difference between the amount of cleaning oil and the amount of discharged oil; Step S71: Determine the oil film coverage based on the initial residual amount, product information, and stirring information; Step S72: Determine the oil film thickness based on the temperature change; Step S73: Retrieve the inner wall area from the stirring information and determine the coverage area in conjunction with the rotation command; Step S74: Determine the desired amount of oil film based on product information, coverage area, and oil film thickness; Step S75: If the absolute difference between the planned oil film amount and the oil film coverage amount is less than the preset error threshold, then the initial residual amount is taken as the residual oil amount. Step S76: If the absolute difference between the proposed oil film amount and the oil film coverage amount is not less than the error threshold, then calculate the average coverage amount of the proposed oil film amount and the oil film coverage amount and match the corresponding residual oil amount.

8. The control method for a rubber internal mixer according to claim 7, characterized in that, Also includes: Step S80: If residual points exist, determine the distribution type based on the residual points; Step S81: Determine the cleaning plan based on the distribution type and stirring information; Step S82: Generate cleaning instructions based on residual locations and cleaning plans; Step S83: After completing the cleaning command, re-determine whether the cleaning is complete.

9. A rubber internal mixer, applied to a control method for a rubber internal mixer as described in any one of claims 1 to 8, comprising a mixing body (1), characterized in that, The mixing body (1) is also equipped with a pressing device (2) for forced pressing, a mixing device (3) for mixing rubber materials, a rotating device (4) for driving the mixing device (3) to open and close, and a driving device (5) for driving the mixing device (3) to run. The mixing device (3) includes a mixing chamber (31) for containing rubber raw materials and a plurality of rotors (32) rotatably mounted in the mixing chamber (31) for stirring, shearing and mixing rubber raw materials and compounding agents. The mixing chamber (31) is rotatably mounted on the mixing body (1).

10. A rubber internal mixer according to claim 9, characterized in that, The pressing device (2) includes an upper top bolt (21) for pressing the rubber raw material in the mixing chamber (31) and a lifting structure (22) for driving the upper top bolt (21) closer to or further away from the mixing chamber (31). Multiple drive devices (5) are provided, and each drive device (5) corresponds to a rotor (32) and drives the corresponding rotor (32) to rotate.

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