High speed kneader for producing pp automobile modified material
By combining mixing blades and vacuum degassing technology, the shortcomings of existing kneaders in the dispersion and mixing process have been solved, achieving efficient and stable production of PP automotive modified materials and improving mixing uniformity and product performance.
Patent Information
- Application Number
- CN202522527388.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-07-07
- Estimated Expiration
- 2035-11-28
AI Technical Summary
The blade structure of existing high-speed kneaders is simple, making it difficult to balance high-intensity shearing with gentle mixing. This results in uneven dispersion of inorganic fillers and excessive fiber shearing, affecting the performance of PP automotive modified materials.
It employs a combination of mixing blades, including shearing blades, conveying blades, and cleaning blades, combined with vacuum degassing and inert gas protection, to achieve efficient dispersion and uniform mixing, and prevents cross-contamination through a detachable design.
It achieves efficient dispersion and uniform mixing of PP automotive modified materials, reduces energy consumption, prevents oxidation reactions, and ensures product performance stability and clean production.
Smart Images
Figure CN224465001U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of kneading machine technology, specifically to a high-speed kneading machine for producing PP automotive modified materials. Background Technology
[0002] Polypropylene (PP) automotive modified materials are essential base materials for manufacturing automotive interior and exterior trim parts and functional components. By adding fillers to PP base materials, stringent automotive industry standards such as lightweighting, high strength, high heat resistance, and low VOCs can be met. In the preparation process of this material, a high-speed kneader is a key piece of equipment for premixing raw materials, and its mixing uniformity directly affects the stability of subsequent extrusion granulation and the performance of the final product.
[0003] In the existing technology, high-speed kneaders used to produce PP automotive modified materials usually use blades with a simple structure, which makes it difficult to balance high-intensity shearing with gentle mixing. For inorganic fillers that are prone to agglomeration, insufficient shearing force will lead to uneven dispersion and poor production performance. When the formulation contains reinforcing materials such as glass fiber, the high-speed rotating blades will excessively shear the fibers, severely damaging their aspect ratio and causing a significant decrease in the impact strength and tensile strength of the material.
[0004] Therefore, this utility model proposes a high-speed kneader for producing PP automotive modified materials to solve the above-mentioned problems. Utility Model Content
[0005] The purpose of this invention is to provide a high-speed kneader for producing PP automotive modified materials, which solves the problem in the existing technology that the blade structure is too simple and it is difficult to balance high-intensity shearing and gentle mixing.
[0006] The technical solution adopted by this utility model to solve its technical problem is:
[0007] A high-speed kneader for producing PP automotive modified materials includes a mixing chamber, a discharge chamber connected to the bottom of the mixing chamber, and a discharge channel at the lower end of the discharge chamber. A feed pipe and a negative pressure pipe are connected to the top side wall of the mixing chamber. The negative pressure pipe is used to connect to a vacuum degassing device. Multiple auxiliary feeding ports are connected to the side wall of the feed pipe. An electrical control box is connected to the top of the mixing chamber, containing a controller. A drive motor is also installed on the top of the mixing chamber. A rotating shaft is coaxially rotatably connected within the mixing chamber. The output shaft of the drive motor is coaxially connected to the rotating shaft. The controller is electrically connected to the drive motor. A combination of stirring blades is fixed around the periphery of the rotating shaft. The combination of stirring blades includes shearing blades, conveying blades, and cleaning blades, which are arranged sequentially from top to bottom. A support plate is provided at the top of the unloading chamber. The support plate is longitudinally slidably connected to the rotating shaft. A propulsion cylinder is connected between the support plate and the unloading chamber. A material discharge channel is opened on the inner wall of the unloading chamber. A gas input pipeline is connected to the side wall of the unloading chamber. The bottom end of the rotating shaft extends through the support plate into the unloading chamber. An air inlet is opened on the bottom end face of the rotating shaft. Multiple exhaust holes communicating with the air inlet are evenly opened on the upper end of the side wall of the rotating shaft.
[0008] Furthermore, the mixing chamber includes a first chamber and a second chamber, the first chamber being detachably connected to the upper end of the second chamber, the feed pipe and the negative pressure pipe being connected to the first chamber, and the discharge chamber being connected to the lower end of the second chamber.
[0009] Furthermore, a temperature measuring element is connected to the upper end of the first cavity, and the temperature measuring element is electrically connected to the controller; a temperature control interlayer is provided on the outer wall of the second cavity, and a medium inlet interface and a discharge interface are connected to the temperature control interlayer.
[0010] Furthermore, the shearing blade is connected to the upper end of the rotating shaft, and the edge of the shearing blade is wavy; the conveying blade is connected to the middle part of the rotating shaft, and the conveying blade is set with an inclined curved surface; the cleaning blade is connected to the lower end of the rotating shaft, and the cleaning blade is clearance-fitted with the inner wall of the mixing chamber.
[0011] Furthermore, a check valve is connected to the bottom end face of the rotating shaft corresponding to the air inlet.
[0012] Furthermore, the upper surface of the carrier plate is inclined downwards.
[0013] Furthermore, an end cap is connected to the lower end of the unloading chamber corresponding to the discharge channel.
[0014] In summary, compared with the prior art, the beneficial effects of this utility model are as follows:
[0015] This invention achieves multi-functional collaborative operation through a combination of shearing blades, conveying blades, and cleaning blades. The shearing blades with wavy edges provide high-intensity local shearing, effectively breaking up filler agglomerates and ensuring uniform distribution of additives. The inclined curved conveying blades form a powerful axial circulating flow in the mixing chamber, enabling rapid exchange of materials between upper and lower layers, solving the problem of mixing dead zones, and achieving uniform mixing globally. While ensuring dispersion effect, it has higher mixing efficiency and lower energy consumption compared to traditional single-blade impellers.
[0016] The cleaning blades of this invention have a gap fit with the inner wall of the mixing chamber, which can continuously scrape off the material adhering to the inner wall during operation and unloading, thus achieving dynamic self-cleaning.
[0017] The negative pressure pipeline of this invention can vacuum the material during the mixing process, making it easier for the volatiles wrapped by the material to be exposed on the surface and removed, thus improving the efficiency of vacuum devolatization.
[0018] This invention can monitor and adjust the mixing temperature in real time, ensuring the stability of product performance.
[0019] The detachable connection between the first and second cavities of this invention facilitates thorough manual cleaning and maintenance, thus solving the problem of cross-contamination.
[0020] This invention utilizes a gas channel formed by a gas input pipe, an air inlet, and an exhaust outlet. This channel allows for the injection of inert gases such as nitrogen during mixing, while expelling oxygen from the chamber. This creates an oxygen-free mixing environment for the materials, preventing oxidation reactions at high temperatures. Attached Figure Description
[0021] Figure 1 This is a three-dimensional schematic diagram of the present invention;
[0022] Figure 2 This is the front view of the present invention;
[0023] Figure 3 This is a partial cross-sectional view of the main view of this utility model;
[0024] Figure 4 This is a partial cross-sectional view of the right side of this utility model.
[0025] In the diagram: 1. First cavity; 2. Second cavity; 3. Discharge cavity; 4. End cap; 5. Feed pipe; 6. Auxiliary feeding port; 7. Negative pressure pipe; 8. Electrical control box; 9. Drive motor; 10. Rotating shaft; 11. Shearing blade; 12. Conveying blade; 13. Cleaning blade; 14. Bearing plate; 15. Propulsion cylinder; 16. Discharge channel; 17. Gas input pipe; 18. Air inlet; 19. Exhaust port; 20. Check valve; 21. Temperature sensing element; 22. Temperature control jacket; 23. Medium inlet; 24. Discharge port. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0027] In this application, the terms "upper," "inner," "outer," "middle," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0028] like Figure 1-4 As shown, a high-speed kneader for producing PP automotive modified materials includes a mixing chamber. A discharge chamber 3 is connected to the bottom of the mixing chamber, and a discharge channel is provided at the lower end of the discharge chamber 3. An end cap 4 is connected to the lower end of the discharge chamber 3 corresponding to the discharge channel. A feed pipe 5 and a negative pressure pipe 7 are connected to the top of the side wall of the mixing chamber. The negative pressure pipe 7 is used to connect to a vacuum degassing device. Multiple auxiliary feeding ports 6 are connected to the side wall of the feed pipe 5. An electrical control box 8 is connected to the top of the mixing chamber, containing a controller. A drive motor 9 is also installed on the top of the mixing chamber. A rotating shaft 10 is coaxially rotatably connected within the mixing chamber. The output shaft of the drive motor 9 is coaxially connected to the rotating shaft 10. The controller is electrically connected to the drive motor 9.
[0029] Furthermore, a combined stirring blade is fixed around the outer periphery of the rotating shaft 10. The combined stirring blade includes a shearing blade 11, a conveying blade 12, and a cleaning blade 13, which are arranged sequentially from top to bottom. The shearing blade 11 is connected to the upper end of the rotating shaft 10, and the edge of the shearing blade 11 is wavy. The conveying blade 12 is connected to the middle part of the rotating shaft 10, and the conveying blade 12 is arranged with an inclined curved surface. The cleaning blade 13 is connected to the lower end of the rotating shaft 10, and the cleaning blade 13 is in clearance fit with the inner wall of the mixing chamber.
[0030] Furthermore, a support plate 14 is provided at the top of the unloading chamber 3, and the support plate 14 is longitudinally slidably connected to the rotating shaft 10. The upper surface of the support plate 14 is inclined downward. A propulsion cylinder 15 is connected between the support plate 14 and the unloading chamber 3. A material drop channel 16 is opened on the inner wall of the unloading chamber 3, and a gas input pipe 17 is connected to the side wall of the unloading chamber 3. The bottom end of the rotating shaft 10 extends through the support plate 14 into the unloading chamber 3. An air inlet hole 18 is opened on the bottom end face of the rotating shaft 10, and multiple exhaust holes 19 communicating with the air inlet hole 18 are evenly opened on the upper end of the side wall of the rotating shaft 10. A check valve 20 is connected to the bottom end face of the rotating shaft 10 corresponding to the air inlet hole 18.
[0031] Furthermore, the mixing chamber includes a first chamber 1 and a second chamber 2. The first chamber 1 is detachably connected to the upper end of the second chamber 2. The feed pipe 5 and the negative pressure pipe 7 are connected to the first chamber 1, and the discharge chamber 3 is connected to the lower end of the second chamber 2. A temperature measuring element 21 is connected to the upper end of the first chamber 1, and the temperature measuring element 21 is electrically connected to the controller. The outer wall of the second chamber 2 is provided with a temperature control jacket, and a medium inlet interface and a discharge interface 24 are connected to the temperature control jacket.
[0032] The working process of this utility model is as follows:
[0033] First, the process parameters for producing the modified PP material are set by the controller, including mixing temperature, rotation speed, vacuum degree and mixing time. Then the equipment is started. The main material, polypropylene (PP) granules, is added through the main inlet of the feed pipe 5. Various fillers and functional additives are added precisely and orderly through different auxiliary feed ports 6 to avoid initial agglomeration.
[0034] Then, the drive motor 9 starts, driving the rotating shaft 10 and the combined stirring blades fixed on the shaft to rotate at high speed. Then, the shearing blade 11 generates a strong tearing and shearing effect on the material clumps through the wavy edge, ensuring that the PP base material and high-content filler are initially mixed and the agglomeration is broken, achieving high-strength dispersion. Then, the conveying blade 12 uses its inclined curved surface structure to form a strong axial material flow in the mixing chamber, so that the material in the upper and lower layers is continuously circulated and exchanged, solving the problem of material stratification in traditional mixing and ensuring the uniformity of the material in the entire chamber.
[0035] Meanwhile, during the mixing process, the temperature sensing element 21 monitors the temperature inside the chamber in real time and feeds it back to the controller. If the frictional heating is too high, the controller can start the cooling system, so that the medium flows into the temperature control jacket from the medium inlet and flows out from the outlet 24, thereby achieving precise cooling of the material and preventing PP thermal degradation. If auxiliary heating is required, it can also be achieved through the medium.
[0036] Simultaneously, the vacuum degassing device connected to negative pressure pipeline 7 is activated to evacuate the sealed mixing chamber. Under negative pressure, moisture and low-molecular-weight volatiles in the material are effectively extracted, significantly reducing the VOC content and odor of the modified material and preventing the generation of bubbles during subsequent processing.
[0037] For easily oxidized materials, inert protective gases such as nitrogen can be injected into the system through the gas input pipe 17. The gas enters the hollow channel of the rotating shaft 10 through the air inlet 18 and is finally discharged evenly from the exhaust port 19 at the top, forming a protective atmosphere around the material to prevent oxidation and degradation during the high-temperature mixing process.
[0038] After the mixing process is completed, the drive motor 9 stops, the propulsion cylinder 15 actuates, and the carrying plate 14 moves downward, causing its upper surface to detach from the cleaning blades 13. The mixed material then falls into the discharge chamber 3 through the material drop channel 16 between the edge of the carrying plate 14 and the chamber wall, thereby opening the end cover 4 at the bottom of the discharge channel and discharging the material. Throughout the discharge process, the cleaning blades 13 maintain a clearance fit with the inner wall of the mixing chamber, effectively scraping off the residue adhering to the wall, achieving a self-cleaning function, and ensuring that there is no residue or dead corners during discharge.
[0039] When deep cleaning or formula change is required, the first chamber 1 can be detached from the second chamber 2, allowing the inside of the equipment to be fully exposed, which greatly facilitates manual cleaning and equipment maintenance.
Claims
1. A high-speed kneader for producing PP automotive modified materials, comprising a mixing chamber, characterized in that, The bottom end of the mixing chamber is connected to the unloading chamber (3), and the lower end of the unloading chamber (3) is provided with a discharge channel; the top of the side wall of the mixing chamber is connected to the feed pipe (5) and the negative pressure pipe (7), the negative pressure pipe (7) is used to connect to the vacuum degassing device, and the side wall of the feed pipe (5) is connected to multiple auxiliary feeding ports (6). An electrical control box (8) is connected to the top of the mixing chamber. A controller is installed inside the electrical control box (8). A drive motor (9) is also installed on the top of the mixing chamber. A rotating shaft (10) is coaxially rotatably connected inside the mixing chamber. The output shaft of the drive motor (9) is coaxially connected to the rotating shaft (10). The controller is electrically connected to the drive motor (9). The rotating shaft (10) is fixed with a combination of stirring blades. The combination of stirring blades includes shearing blades (11), conveying blades (12) and cleaning blades (13). The shearing blades (11), conveying blades (12) and cleaning blades (13) are arranged sequentially from top to bottom. The top of the unloading chamber (3) is provided with a bearing plate (14), the bearing plate (14) is longitudinally slidably connected to the rotating shaft (10), a propulsion cylinder (15) is connected between the bearing plate (14) and the unloading chamber (3), a material drop channel (16) is opened on the inner wall of the unloading chamber (3), and a gas input pipeline (17) is connected to the side wall of the unloading chamber (3). The bottom end of the rotating shaft (10) extends through the bearing plate (14) into the unloading chamber (3). An air inlet (18) is provided on the bottom end face of the rotating shaft (10). Multiple exhaust holes (19) communicating with the air inlet (18) are evenly provided on the upper side wall of the rotating shaft (10).
2. The high-speed kneader for producing PP automotive modified materials according to claim 1, characterized in that, The mixing chamber includes a first chamber (1) and a second chamber (2). The first chamber (1) is detachably connected to the upper end of the second chamber (2). The feed pipe (5) and the negative pressure pipe (7) are connected to the first chamber (1). The discharge chamber (3) is connected to the lower end of the second chamber (2).
3. A high-speed kneader for producing PP automotive modified materials according to claim 2, characterized in that, The upper end of the first cavity (1) is connected to a temperature measuring element (21), which is electrically connected to the controller; the outer wall of the second cavity (2) is provided with a temperature control interlayer (22), which is connected to a medium inlet interface (23) and an outlet interface (24).
4. A high-speed kneader for producing PP automotive modified materials according to claim 1, characterized in that, The shearing blade (11) is connected to the upper end of the rotating shaft (10), and the edge of the shearing blade (11) is wavy; the conveying blade (12) is connected to the middle part of the rotating shaft (10), and the conveying blade (12) is set with an inclined curved surface; the cleaning blade (13) is connected to the lower end of the rotating shaft (10), and the cleaning blade (13) is in clearance fit with the inner wall of the mixing chamber.
5. A high-speed kneader for producing PP automotive modified materials according to claim 1, characterized in that, The bottom end face of the rotating shaft (10) is connected to a check valve (20) corresponding to the air inlet (18).
6. A high-speed kneader for producing PP automotive modified materials according to claim 1, characterized in that, The upper surface of the bearing plate (14) is inclined downward.
7. A high-speed kneader for producing PP automotive modified materials according to claim 1, characterized in that, The lower end of the unloading chamber (3) is connected to the discharge channel with an end cap (4).