Ingredient stirring device for injection molding of automotive upholstery

Abstract

The invention discloses an ingredient stirring device for injection molding of automotive upholstery. The ingredient stirring device comprises a storage module, a feeding module, a mixing module, a conveying module and a control module. The storage module is provided with a plurality of groups of storage bins for storing particles, powder and liquid materials, the material level is monitored in real time through a sensor, and continuous feeding is guaranteed; a multi-section variable-diameter spiral feeding device and a weighing type metering device of the feeding module realize accurate conveying and proportional control of materials; the mixing module is composed of a mixing chamber, a dynamic stirring system and a temperature control device, the stirring system is driven by a servo motor, efficient and uniform mixing is achieved by adjusting the angle and speed of stirring blades, and the temperature control device keeps the temperature stable in the mixing process; the conveying module conveys the mixed materials to an injection molding machine through a discharging pipeline and a detachable filtering system; the control module integrates a touch screen and a Bluetooth module and is used for real-time monitoring and remote operation. The device is high in batching uniformity and high in feeding precision, and meets the requirements of injection molding production of automotive upholstery.

Description

Technical Field

[0001] The invention relates to a batching and stirring device, in particular to a batching and stirring device for injection molding of automobile interior decoration parts. Background Art

[0002] In the modern automobile manufacturing industry, the production of automotive interior parts requires highly precise injection molding technology to ensure that the product's appearance and function are of excellent quality. In order to achieve this goal, the injection molding batching and mixing device plays a vital role in the production process. The existing batching and mixing devices mainly include vertical mixers, drum mixers, and mixing devices in the central feeding system. The vertical mixer achieves material mixing through the high-speed rotation of the vertical blades, the drum mixer relies on the rotation of the drum to make the materials roll to achieve uniform distribution, and the central feeding system conveys different materials to the mixing device through a multi-bin metering system. Although these devices can meet the basic needs of general injection molding production, they gradually show many problems in handling complex automotive interior parts production.

[0003] Existing mixing devices perform poorly in terms of mixing uniformity. Since most traditional equipment relies on tumbling or rotating motion in a single direction, the mixing effect of materials is easily affected by particle size, shape and material fluidity, especially in the mixing process of multi-component materials, the uneven phenomenon is particularly significant. For automotive interior parts, mixing uniformity directly affects the color consistency and mechanical performance stability of the product. Uneven mixing can cause color difference on the surface of the finished product and uneven distribution of performance areas, which seriously affects the appearance quality and service life of the interior parts. In addition, some additives such as flame retardants and UV inhibitors are difficult to fully disperse in traditional mixing equipment due to their small particles and easy aggregation, further reducing product performance. Secondly, feeding accuracy and efficiency are another significant problem. The batching method in traditional equipment mostly relies on manual weighing and preliminary metering, which makes it difficult to achieve high-precision control of material ratios. Even the automated mixing device in the central feeding system often has the problem of accumulated batching errors after long-term operation due to the lack of dynamic adjustment capabilities. Insufficient batching accuracy directly affects the functionality and stability of interior parts, resulting in inconsistent quality between batches. This instability not only increases the difficulty of production management, but also makes the finished products lack competitiveness. Existing mixing devices still have a lot of room for improvement in terms of intelligence and automation. Most equipment lacks real-time monitoring function during operation, and the mixing status and material supply situation rely entirely on the operator's experience and judgment, which is prone to operating errors, resulting in reduced production efficiency. With the diversification and complexity of the demand for automotive interior parts, it is difficult for traditional equipment to quickly adjust production parameters to meet different process requirements. At the same time, the lack of data recording and analysis capabilities also limits the optimization of the production process and the traceability of product quality. At the same time, the maintenance problems of traditional equipment in operation are also a headache. Because plastic particles and additives are easy to absorb moisture and generate static electricity in storage silos or conveying channels, material adhesion or blockage occurs frequently. The mixing blades and spiral feeding devices are in a high-load working state for a long time, and they are severely worn, which not only affects the mixing effect, but also increases the maintenance frequency and repair cost of the equipment. Especially under high-intensity production tasks, these problems will lead to a significant increase in downtime, seriously restricting production efficiency. High energy consumption and insufficient adaptability to new materials are also challenges faced by traditional mixing devices. Most equipment has low operating efficiency and high energy consumption when mixing large quantities of materials, which does not meet the current environmental protection requirements of energy saving and consumption reduction. In addition, as the automotive industry continues to pay more attention to sustainable development, more new composite materials are used in the manufacture of interior parts. However, these new materials often have special processing characteristics that traditional mixing equipment is difficult to adapt to, resulting in loss of material performance and instability in the production process.

[0004] In summary, the existing batching and stirring devices for injection molding of automotive interior parts have many deficiencies in terms of mixing uniformity, feeding accuracy, intelligence level, maintenance convenience and energy efficiency. These problems not only affect the quality of automotive interior parts, but also increase production costs and management complexity. Therefore, there is an urgent need for an improved mixing device with high mixing efficiency, precise feeding capability, intelligent monitoring system and adaptability to diversified materials to meet the requirements of modern automotive interior parts production for high quality and high efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide an improved injection molding mixing device for the problems of poor mixing uniformity, insufficient feeding accuracy, low intelligence level, and complex maintenance in the batching and stirring device for injection molding of automotive interior parts in the prior art. The device optimizes the design of the storage bin, introduces a material detection sensor, monitors the material state in real time, and ensures the continuity and stability of material supply. At the same time, the improved spiral feeding system adopts a multi-stage variable diameter design, which significantly improves the accuracy and flow uniformity of feeding, and cooperates with a weighing metering device to achieve precise control of the conveying speed and proportion of various materials. In order to improve the mixing uniformity, the present invention adopts dynamic stirring technology in the mixing chamber, and the stirring blade can adjust the angle and speed according to the material characteristics to avoid mixing dead angles, and accurately control the temperature in the mixing chamber through a temperature control device to meet the processing requirements of different materials. In addition, a filtering system is set in the conveying module, which can effectively intercept unmixed lumps or large particle impurities to ensure the consistency of the quality of the materials delivered to the injection molding machine. The present invention is also equipped with a control module, which realizes remote monitoring of the equipment and real-time display of the operating status through an integrated touch screen control panel and a Bluetooth module. Finally, the present invention improves the mixing and feeding quality through the above innovations, simplifies operation and maintenance, and meets the requirements of modern automotive interior parts production for high precision, high performance and high reliability.

[0006] The present invention provides the following technical solutions:

[0007] A batching and stirring device for injection molding of automobile interior decoration parts, comprising an injection molding machine, a material storage module, a material feeding module, a mixing module, a conveying module and a control module;

[0008] The material storage module is equipped with multiple groups of storage bins and sensors, the multiple groups of storage bins are used to store materials in different forms, and the sensors are used to monitor the material level in the storage bins in real time;

[0009] One end of the feeding module is connected to the storage module, and the feeding module includes a spiral feeding device and a metering device. The spiral feeding device is a multi-stage variable diameter feeding device, which is used to transport the materials in the storage module to the mixing module, and the metering device is used to control the conveying speed and proportion of various materials;

[0010] The mixing module is connected to the other end of the feeding module, and the mixing module includes a mixing chamber and a temperature control device. A dynamic stirring system is integrated in the mixing chamber. The dynamic stirring system is driven by a servo motor, and the speed and stirring angle are adjusted according to the material characteristics. The temperature control device controls the mixing temperature;

[0011] The conveying module includes a discharge pipe and a filtering system; the discharge pipe conveys the mixed material to the injection molding machine, and the filtering system filters unmixed lumps or large particles of impurities;

[0012] The control module controls the operation of other modules through the control panel, and is connected to a mobile device through a Bluetooth module to achieve remote control and operation.

[0013] Preferably, the storage bins of the storage module include a granular material storage bin, a powder material storage bin and a liquid material storage bin, the inner walls of the storage bins are coated with an anti-adhesion coating, the granular material storage bin is equipped with a vibration device, the powder material storage bin is equipped with a pneumatic nozzle, and the liquid material storage bin is equipped with a constant temperature heating jacket.

[0014] Preferably, the sensor is an ultrasonic sensor, which can detect the material level in the storage bin in real time and send a material level signal to the control module. When it is detected that the material level is lower than a preset threshold, the control module starts an automatic feeding program.

[0015] Preferably, the spiral feeding device of the feeding module includes a multi-section variable diameter screw and a gradually changing diameter conveying pipe. The diameter and lead of the multi-section variable diameter screw change section by section along the feeding direction. The diameter of the starting section is smaller to accelerate material conveying, the diameter of the middle section increases to release pressure, and the diameter of the end section decreases to ensure uniformity of material flow.

[0016] Preferably, the metering device is a weighing metering device equipped with a high-precision electronic sensor, which can dynamically monitor the weight of the material, and the metering error does not exceed ±0.1%.

[0017] Preferably, the mixing chamber of the mixing module is a transparent structure, and the dynamic stirring system includes multi-directional stirring blades, the angle and rotation speed of the blades are controlled by a servo motor, and the blades automatically adjust the stirring path according to the material characteristics to avoid mixing dead corners.

[0018] Preferably, the temperature control device includes an electric heating film heating device and a hot air circulation system.

[0019] Preferably, the filter system of the conveying module is detachable and the pore size of the filter is 0.2-1.0 mm.

[0020] Preferably, the control panel of the control module is integrated with a touch screen display, which displays the operating status of each module in real time, including the material level of the storage module, the conveying speed of the feeding module, the temperature and stirring status of the mixing module, and synchronizes the operating data with the mobile device through the Bluetooth module.

[0021] The beneficial effects of the present invention are:

[0022] 1) In the present invention, the design of the storage module has multiple groups of storage bins, and its structure can not only meet the diversified storage needs of granular, powder and liquid materials, but also monitor the material level status in each storage bin in real time through sensors. The inner wall of the granular material storage bin is coated with an anti-adhesion coating and equipped with a vibration device to prevent particle accumulation or jamming at a vibration frequency of 50Hz to ensure the continuity of feeding; a pneumatic nozzle is set at the bottom of the powder material storage bin to loosen the powder by spraying 0.3 MPa compressed air every 10 minutes to prevent agglomeration and improve fluidity; the liquid material storage bin maintains the fluidity of liquid materials such as plasticizers through a constant temperature heating jacket, and the heating temperature is stabilized at 60°C. The flexibility of multiple groups of storage bins enables the equipment to adapt to a variety of materials, and the automatic monitoring function of the sensor ensures the efficient connection between the storage and feeding processes, thereby reducing manual intervention and improving the overall automation level of the production line.

[0023] 2) When the feeding module is started, the spiral feeding device accurately transports various materials to the mixing module through a multi-stage variable diameter screw, and the metering device dynamically monitors the weight and proportion of material transportation in real time. During the feeding process, the starting section of the screw quickly starts material transportation at a speed of 300 revolutions per minute, the middle section reduces the feeding pressure and stabilizes the fluidity at 150 revolutions per minute, and the final section improves the flow uniformity at 200 revolutions per minute to ensure that the material enters the mixing module smoothly. The weighing metering device achieves precise control of 10 kg of granular materials, 2 kg of powder materials, and 1.5 kg of liquid materials, and its error is controlled within ±10 grams, meeting the requirements of high-precision formulas. The multi-stage variable diameter design combined with the high-precision metering device optimizes the flow state and batching accuracy during the feeding process, solves the problem of error in the material delivery ratio before mixing, and makes the mixing process more stable and reliable.

[0024] 3) The mixing module ensures the full integration and stable quality of the materials in the mixing chamber through the synergistic effect of the dynamic stirring system and the temperature control device. The mixing chamber has a volume of 80L, and the transparent structure allows the operator to observe the mixing state in real time. In the initial stage, the blade angle of the dynamic stirring system is set to 30° and the speed is 150 rpm, and the mixing is started in a gentle shearing manner; after the material is fully tumbled, the blade angle is adjusted to 45° and the speed is increased to 300 rpm, and the material is quickly and evenly dispersed by enhancing the shear force and centrifugal action. The temperature control device uses an electric heating film to keep the temperature in the mixing chamber at 70°C, which is adapted to the plasticizing characteristics of polypropylene particles to avoid the volatilization or decomposition of the plasticizer. At the same time, the hot air circulation system runs every 2 minutes to ensure uniform temperature in the mixing chamber. After mixing, the material is transported through the discharge pipe of the conveying module, and the unmixed lumps or large particles of impurities are intercepted by the 0.5 mm filter screen of the filtration system. The whole process not only achieves efficient and uniform mixing effect, but also improves the final product quality of the production line, while having good adaptability and ease of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the storage module;

[0028] Figure 3 It is a structural schematic diagram of the feeding module;

[0029] Figure 4 is a schematic diagram of the structure of the hybrid module;

[0030] Figure 5 It is a schematic diagram of the structure of the filtration system;

[0031] Figure 6 It is a schematic diagram of the structure of the control panel;

[0032] Markings in the figure:

[0033] 1. Storage module; 2. Feeding module; 3. Mixing module; 4. Conveying module; 5. Control module; 11. Storage bin; 12. Sensor; 21. Screw feeding device; 22. Measuring device; 31. Mixing chamber; 32. Temperature control device; 33. Dynamic stirring system; 41. Discharge pipe; 42. Filtration system; 51. Control panel. DETAILED DESCRIPTION

[0034] like Figure 1As shown, a batching and stirring device for injection molding of automotive interior parts includes an injection molding machine, a material storage module 1, a feeding module 2, a mixing module 3, a conveying module 4 and a control module 5. The material storage module 1 is equipped with multiple groups of storage bins 11 and sensors 12 ( Figure 2 ). The storage bin 11 includes a granular material storage bin, a powder material storage bin and a liquid material storage bin: the granular material storage bin has a capacity of 100L, mainly storing plastic particles such as PP and ABS, the inner wall is coated with an anti-adhesion Teflon coating, and is equipped with a vibration device to prevent particle accumulation. The powder material storage bin has a capacity of 50L and is used to store talcum powder, flame retardants, etc. The bottom is equipped with a pneumatic nozzle to prevent agglomeration and ensure fluidity. The liquid material storage bin has a capacity of 20L and is used to store liquid materials such as plasticizers and lubricants. It is equipped with a constant temperature heating jacket to maintain fluidity, and the temperature range is 30°C to 80°C. The sensor 12 is an ultrasonic sensor that monitors the material level in the storage bin 11 in real time. When the material level is detected to be lower than 10%, the sensor sends a signal to the control module 5, and the control module 5 immediately starts the feeding program. One end of the feeding module 2 is connected to the storage module 1, and the other end is connected to the mixing module 3, including a spiral feeding device 21 and a metering device 22. The screw feeding device 21 adopts a multi-stage variable diameter design: the diameter of the screw starting section is 30mm, which is used to accelerate the initial conveying of materials. The diameter of the middle section gradually increases to 50mm to reduce the feeding pressure and ensure smooth flow of materials. The diameter of the end section is reduced to 40mm to enhance the flow uniformity and ensure that the material remains in a stable state before entering the mixing module 3 ( Figure 3). The metering device 22 is a weighing metering device: equipped with a high-precision electronic sensor, real-time monitoring of material weight, the metering error does not exceed ±0.1%, and can adjust the conveying speed and proportion of various materials according to the preset formula. One end of the mixing module 3 is connected to the feeding module 2, and the other end is connected to the conveying module 4, including a mixing chamber 31, a temperature control device 32 and a dynamic stirring system 33. Mixing chamber 31: It is a transparent structure, which is convenient for real-time observation of the mixing state of the material. The volume is 80L and the inner wall is coated with an anti-adhesion coating. Dynamic stirring system 33: The number of stirring blades is 4, driven by a servo motor with a power of 1.5kW, and the stirring speed ranges from 50rpm to 300rpm. The blade has an adjustable angle of 0° to 45°, which can dynamically adjust the stirring path according to the viscosity and fluidity of the material, effectively avoiding mixing dead corners. Temperature control device 32: It includes an electric heating film heating device and a hot air circulation system: the temperature range is 30℃ to 120℃, and the temperature control accuracy is ±1℃, which can meet the processing requirements of different materials. The conveying module 4 includes a discharge pipe 41 and a filter system 42. The discharge pipe 41: has a diameter of 40 mm and is made of stainless steel. The inner wall is coated with a smooth anti-adhesion coating to prevent material residue during the conveying process. The filter system 42: has a detachable design for easy cleaning and replacement. The filter mesh has an aperture of 0.5 mm and is used to filter unmixed lumps or large particles of impurities to ensure that the quality of the material delivered to the injection molding machine is uniform and stable. The control module 5 achieves comprehensive control of the equipment through the control panel 51 and is connected to the mobile device through the Bluetooth module. The control panel 51: is equipped with a 10-inch touch screen, which displays parameters such as the material level of the storage module 1, the conveying speed of the feeding module 2, the temperature and stirring state of the mixing module 3 in real time, so that the operator can adjust the operating parameters. Bluetooth module: supports remote connection with a mobile phone or computer. The operator can monitor, collect data and adjust the operating status of the equipment through a mobile device.

[0035] Specifically, the present embodiment is divided into four main stages: storage, feeding, mixing and conveying. The operating parameters and usage configurations of each stage are as follows: In the storage module 1, materials of different forms are stored in corresponding storage bins, and the material level is detected in real time by the sensor 12 to ensure the continuity and stability of the subsequent feeding process. Solid particulate materials such as polypropylene particles (PP) are stored in the particle material storage bin 11, which has a volume of 100L and a Teflon anti-adhesion coating on the inner wall to ensure that the particle materials will not adhere due to static electricity or humidity problems during storage. The detection accuracy of the ultrasonic sensor 12 is ±2 mm. When the material level is lower than 10% of the height of the storage bin, the sensor sends a signal to the control module 5 to trigger the automatic feeding program. At this time, the vibration device at the bottom of the storage bin is started, and the vibration frequency is set to 50Hz to prevent particles from blocking the discharge channel. Powder materials such as talcum powder are stored in the powder material storage bin 11, which has a volume of 50L and a pneumatic nozzle at the bottom to prevent powder agglomeration. The pneumatic nozzle will automatically spray compressed air once every 10 minutes with a spray pressure of 0.3 MPa to ensure that the powder remains loose. The ultrasonic sensor 12 detects powder materials once every 3 seconds. When the material level is lower than 20%, an alarm will be issued to remind the operator to replenish the powder in time. Liquid materials such as plasticizers are stored in the liquid material storage bin 11 with a volume of 20L. A constant temperature heating jacket is provided outside the storage bin, and the heating temperature is set to 60°C to maintain the fluidity and chemical stability of the liquid material. The liquid level sensor monitors the remaining amount of liquid material in real time. When the material is lower than 15% of the volume, the system will automatically send a refill signal.

[0036] The spiral feeding device 21 of the feeding module 2 is responsible for accurately conveying the materials in the storage module to the mixing module 3. During the feeding process, the metering device 22 is combined to realize the precise proportion control of various materials. The spiral feeding device 21 adopts a multi-stage variable diameter design. The diameter of the starting screw is 30 mm, the lead is 20 mm, and the screw speed is set to 300 rpm, which is used to quickly start the conveying of granular materials. The diameter of the middle screw is increased to 50 mm, the lead is 40 mm, and the speed is reduced to 150 rpm, in order to reduce the feeding pressure and ensure the fluidity of the granular material. The diameter of the last screw is reduced to 40 mm, the lead is adjusted to 25 mm, and the speed is increased to 200 rpm to ensure that the granular material maintains a uniform flow state before entering the mixing module. The metering device 22 is a weighing metering device that monitors the weight of the granular material in real time. The target weight of a single feeding is 10 kg, and the error is controlled within ±10 grams. For powder materials and liquid materials, the metering device controls the delivery volume of 2 kg and 1.5 kg respectively through independent channels to meet the injection molding process formula requirements.

[0037] In the mixing module 3, the material enters the mixing chamber 31 and is stirred by the dynamic stirring system 33. At the same time, the temperature control device 32 heats the mixing chamber or maintains a constant temperature to ensure the best mixing effect. The mixing chamber has a volume of 80L and a transparent structure that allows the operator to observe the mixing state of the material. Figure 4 As shown, after the material enters, the dynamic stirring system 33 is started, the number of stirring blades is 4, the initial blade angle is set to 30°, and the speed is 150 rpm. In order to avoid uneven force on the granular material or adhesion of the powder material, the blade angle will be automatically adjusted to 20° after 30 seconds, and the speed will be increased to 250 rpm to accelerate mixing. The electric heating film heating device keeps the temperature of the mixing chamber at 70°C, which is suitable for the plasticization characteristics of polypropylene particles, and can ensure that the plasticizer will not volatilize or degrade during the mixing process. The hot air circulation system runs every 2 minutes to ensure that the temperature distribution in the mixing chamber is uniform and avoid fluctuations in material properties due to local overheating or cooling. The dynamic stirring system is driven by a servo motor with a power setting of 1.5 kilowatts. The stirring speed is gradually increased from the initial 150 rpm to 300 rpm, and the stirring cycle is 3 minutes. During the stirring process, the angle of the blade will be dynamically adjusted to a maximum of 45° to fully enhance the mutual shearing effect between the materials and ensure that the particles, powders and liquid materials are evenly distributed.

[0038] After mixing, the material is delivered to the injection molding machine through the delivery module 4, during which the filtration system 42 performs the final quality assurance on the material. The diameter of the discharge pipe is 40 mm, and the smooth coating on the inner wall of the pipe ensures that the material does not adhere. The speed of the material passing through the pipe is set at 1 meter per second to avoid material blockage or too fast delivery. Figure 5 As shown, the filter mesh has a pore size of 0.5 mm, which can effectively filter out unmixed lumps and particulate impurities larger than 0.5 mm. The filter mesh needs to be cleaned and replaced after each production cycle to ensure the filtering accuracy for the next use.

[0039] like Figure 6 As shown, the control module 5 realizes intelligent management of the equipment through the control panel 51 and the Bluetooth module. The control panel displays the material level information in the storage module, the weight data of the feeding module, the temperature and stirring status of the mixing module, and the filtering status of the conveying module. Key parameters such as temperature and speed can be adjusted at any time through the touch screen. If an emergency shutdown is required, it can be completed through one-button operation on the panel. After the Bluetooth module is connected to the mobile device, the operator can adjust the mixing time to 3 minutes and 30 seconds through the mobile phone App, or increase the temperature to 75°C to meet the production needs of different batches.

[0040] This embodiment achieves efficient mixing and conveying of materials during the injection molding production process through precise control of each link, greatly improving product uniformity and production efficiency while reducing manual intervention and material waste.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A batching and stirring device for injection molding of automotive interior parts, comprising an injection molding machine, characterized in that: It comprises a material storage module (1), a material feeding module (2), a mixing module (3), a conveying module (4) and a control module (5); The material storage module (1) is equipped with a plurality of groups of material storage bins (11) and sensors (12), wherein the plurality of groups of material storage bins (11) are used to store materials in different forms, and the sensors (12) are used to monitor the material level in the material storage bins (11) in real time; One end of the feeding module (2) is in communication with the storage module (1), and the feeding module (2) comprises a screw feeding device (21) and a metering device (22). The screw feeding device (21) is a multi-stage variable diameter feeding device, which is used to transport the materials in the storage module (1) to the mixing module (3), and the metering device (12) is used to control the transport speed and proportion of various types of materials. The mixing module (3) is connected to the other end of the feeding module (2), and the mixing module (3) comprises a mixing chamber (31) and a temperature control device (32). A dynamic stirring system (33) is integrated in the mixing chamber (31). The dynamic stirring system is driven by a servo motor and adjusts the speed and stirring angle according to the material characteristics. The temperature control device (32) controls the mixing temperature. The conveying module (4) comprises a discharge pipe (41) and a filtering system (42); the discharge pipe (41) conveys the mixed material to the injection molding machine, and the filtering system (42) filters unmixed lumps or large particle impurities; The control module (5) controls the operation of other modules via a control panel (51), and is connected to a mobile device via a Bluetooth module to achieve remote control and operation.

2. The mixing device for injection molding of automotive interior parts according to claim 1, characterized in that: The storage bin (11) of the storage module (1) comprises a granular material storage bin, a powder material storage bin and a liquid material storage bin, the inner wall of the storage bin (11) is coated with an anti-adhesion coating, the granular material storage bin is equipped with a vibration device, the powder material storage bin is equipped with a pneumatic nozzle, and the liquid material storage bin is equipped with a constant temperature heating jacket.

3. The mixing device for injection molding of automotive interior parts according to claim 2, characterized in that: The sensor (12) is an ultrasonic sensor capable of detecting the material level in the storage bin (11) in real time and sending a material level signal to the control module (5); when it is detected that the material level is lower than a preset threshold, the control module (5) starts an automatic material replenishment program.

4. The mixing device for injection molding of automotive interior parts according to claim 1, characterized in that: The spiral feeding device (21) of the feeding module (2) comprises a multi-section variable diameter screw and a gradually variable diameter conveying pipe, wherein the diameter and lead of the multi-section variable diameter screw change step by step along the feeding direction, the diameter of the initial section is smaller to accelerate material conveying, the diameter of the middle section increases to release pressure, and the diameter of the terminal section decreases to ensure uniformity of material flow.

5. The mixing device for injection molding of automotive interior parts according to claim 1, characterized in that: The metering device (22) is a weighing metering device and is equipped with a high-precision electronic sensor.

6. The mixing device for injection molding of automotive interior parts according to claim 1, characterized in that: The mixing chamber (31) of the mixing module (3) is a transparent structure, and the dynamic stirring system (33) comprises multi-directional stirring blades.

7. The mixing device for injection molding of automotive interior parts according to claim 1, characterized in that: The temperature control device (32) comprises an electric heating film heating device and a hot air circulation system.

8. The mixing device for injection molding of automotive interior parts according to claim 1, characterized in that: The filter system (42) of the conveying module (4) is detachable and the filter mesh has an aperture of 0.2-1.0 mm.

9. The mixing device for injection molding of automotive interior parts according to claim 1, characterized in that: The control panel (51) of the control module (5) is integrated with a touch screen display, which displays in real time the material level of the storage module, the conveying speed of the feeding module, the temperature and stirring state of the mixing module, and transmits operating data synchronously with the mobile device via a Bluetooth module.

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