A three-stage extrusion molding equipment

Abstract

The utility model discloses a three-stage extrusion molding equipment. The three-stage extrusion molding equipment includes a vertically arranged frame, including an upper layer, a middle layer and a lower layer; a primary extruder, arranged in the upper layer, including a first feeding mechanism, a first extrusion barrel and a first screw, the first screw is arranged in the first extrusion barrel, for realizing preliminary extrusion; a second-stage extruder, arranged in the middle layer, including a second feeding mechanism, a second extrusion barrel and a second screw; the second screw is arranged in the second extrusion barrel, for realizing secondary extrusion; a third-stage extruder, arranged in the lower layer, including a third feeding mechanism, a third extrusion barrel, a third screw and a mold, the third screw is arranged in the third extrusion barrel, for realizing final extrusion and molding through a mold. The utility model integrates all the advantages of a two-stage extruder and a pre-extruder, and provides strong technical support for the long-term, high-efficiency, high-quality and stable production of molded products of hard materials such as ceramics.

Description

Technical Field

[0001] The utility model relates to the technical field of extrusion molding equipment, in particular to a three-stage extrusion molding equipment. Background Art

[0002] Extrusion molding technology, as an important part of modern ceramic manufacturing industry, has achieved remarkable development in recent years. This technology mixes ceramic powder with additives and then uses an extruder to extrude the materials, which greatly improves the production efficiency and shape complexity of ceramic products. Ceramic products that can be produced include pipes, vases, ceramic parts with complex structures, etc., and its application areas cover architectural ceramics, industrial ceramics, electronic ceramics and many other fields.

[0003] The main difficulty faced by the extrusion process of ceramics such as silicon carbide lies in its extremely high hardness and brittleness. Since the hardness of silicon carbide ceramics is close to that of diamond, traditional extrusion tools are difficult to deal with effectively, wear quickly, and have low processing efficiency. In addition, the brittleness of ceramics makes it very easy to crack and break during the extrusion process, posing a serious threat to the integrity and surface quality of the product. The particle size and distribution of ceramics have an important influence on the quality of extrusion molding.

[0004] However, the existing two-stage extruder has limitations in adjusting and controlling the particle size distribution, making it difficult to achieve the ideal molding effect and may cause internal non-uniformity of the product, affecting its mechanical properties and wear resistance. Utility Model Content

[0005] The embodiment of the utility model provides a three-stage extrusion molding device to solve the problems of the existing extrusion equipment being easy to wear, low production efficiency, non-uniformity inside the produced products, and difficulty in ensuring quality.

[0006] The three-stage extrusion molding device provided according to the embodiment of the utility model includes:

[0007] A vertically arranged rack, the rack comprising an upper layer, a middle layer and a lower layer;

[0008] A primary extruder, arranged on the upper layer, comprising a first feeding mechanism, a first extrusion barrel and a first screw, wherein the first screw is arranged in the first extrusion barrel for achieving preliminary extrusion;

[0009] A second-stage extruder, arranged in the middle layer, comprises a second feeding mechanism, a second extrusion barrel and a second screw; the second screw is arranged in the second extrusion barrel for realizing secondary extrusion;

[0010] The third-stage extruder is arranged in the lower layer, and comprises a third feeding mechanism, a third extrusion barrel, a third screw and a die. The third screw is arranged in the third extrusion barrel to achieve final extrusion and molding through the die.

[0011] In some embodiments, the length of the first screw is shorter than that of the second screw, and the length of the second screw is shorter than that of the third screw; and / or,

[0012] The aspect ratio of the first screw is smaller than that of the second screw, and the aspect ratio of the second screw is smaller than that of the third screw.

[0013] In some embodiments, the first feeding mechanism comprises a hopper, and the second feeding mechanism and the third feeding mechanism comprise a vacuum chamber, wherein the vacuum chamber is disposed between the feeding mechanism and the end of the screw.

[0014] In some embodiments, the inlet of the vacuum chamber is provided with a porous plate, the screw passes through the porous plate, and a cutting blade is provided at the end of the screw.

[0015] In some embodiments, the frame further includes a bottom layer, on which at least one vacuum pumping device is disposed, and the vacuum pumping device is connected to the vacuum chamber.

[0016] In some embodiments, the first extrusion cylinder, the second extrusion cylinder, the third extrusion cylinder and the mold are respectively provided with a temperature sensor and / or a pressure sensor;

[0017] The system further comprises a controller, wherein the controller controls the operation of each of the extruders according to the parameters of each of the temperature sensors and / or pressure sensors.

[0018] In some embodiments, a water jacket is provided in the shell of each extrusion cylinder for achieving heat exchange through cooling water; and / or,

[0019] A through hole is provided in the length direction of each screw rod, and cooling water passes through the through hole.

[0020] In some embodiments, the primary extruder, the second-stage extruder, and the third-stage extruder further include a motor and a reducer, respectively, the reducer is provided with two parallel output shafts, respectively connected to the screw and the stirring shaft, the stirring shaft is provided on the feeding mechanism, and the screw passes through the feeding mechanism and the extrusion barrel; and / or,

[0021] The extrusion pressure and rotation speed of each screw in the primary extruder, the second-stage extruder and the third-stage extruder are increased step by step.

[0022] In some embodiments, the screw and the stirring shaft rotate in opposite directions; and / or, the screw and the stirring shaft are provided with spiral blades, and the spiral blades are provided in sections; and / or,

[0023] The strength and / or wear resistance of the third screw is greater than the strength and / or wear resistance of the first screw and the second screw.

[0024] In some embodiments, the three-stage extrusion molding device is used for extrusion molding of ceramic products, and the inlet of the first feeding mechanism is connected to the outlet of the raw material mixer.

[0025] Compared with the prior art, the utility model has the following advantages:

[0026] The embodiment of the utility model innovatively designs and implements a three-stage extrusion equipment structure, which is used for efficient molding equipment for hard materials such as ceramics. Its design principle is based on the gradual plasticization, densification and final molding of the material in a continuous and controlled extrusion process.

[0027] Compared with traditional extruders, there is no need to set up pre-extrusion equipment such as clay kneading machines. Through three stages of continuous extrusion, it realizes the processing and forming of hard materials such as ceramics, reduces costs, improves production efficiency, quality and precision, and ensures uniform plasticization and efficient forming of materials during the continuous extrusion process.

[0028] In a further embodiment, by designing a sensing and control system, and by designing a vacuum chamber and a cooling and heat exchange system, key parameters such as temperature, pressure and speed can be accurately controlled, and gradually increasing pressure and shear force can be applied to the material to ensure the molding quality and stable performance of the product.

[0029] In a further embodiment, through the efficient design and processing of the feeding and discharging system, and the close coordination with the extruders at each stage, the continuity and efficiency of the entire production process are achieved.

[0030] The three-stage molding equipment disclosed in the embodiment of the utility model truly realizes multi-stage extrusion molding, is innovative and practical, and is of great significance for improving the overall level of hard material molding technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional exploded schematic diagram of a three-stage extrusion molding device provided by an embodiment of the utility model;

[0032] Figure 2 It is a front view of a three-stage extrusion molding device provided by an embodiment of the utility model;

[0033] Figure 3 This is a physical diagram of a three-stage extrusion molding device provided in one embodiment of the utility model;

[0034] Figure 4 It is a schematic cross-sectional structure diagram of a three-stage extrusion molding device provided by an embodiment of the utility model;

[0035] Figure 5 It is a structural schematic diagram of a reducer provided by an embodiment of the utility model;

[0036] In the figure, 10, frame, 11, upper layer, 12, middle layer, 13, lower layer, 14, bottom layer, 15, reinforcing ribs, 16, supporting feet; 20, primary extruder, 21, first feeding mechanism, 211, hopper, 22, first extrusion barrel, 23, first screw, 24, first stirring shaft, 25, first motor, 26, first reducer, 27, perforated plate, 28, cutting blade, 29, stirring shaft connection port; 30, secondary extruder, 31, second feeding mechanism, 311, vacuum chamber, 312, screw inlet, 32, second extrusion barrel, 33, second screw , 34. second stirring shaft, 35. second motor, 36. second reducer, 37. water jacket, 38. screw connection port, 39. stirring shaft connection port; 40. three-stage extruder, 41. third feeding mechanism, 411. vacuum chamber, 42. third extrusion barrel, 43. third screw, 44. third stirring shaft, 45. third motor, 46. third reducer, 47. water jacket, 48. mold connection flange, 49. screw connection port; 50. vacuum equipment; 60. water cooling pipe; 70. wire harness; 80. pressure sensor; 90. controller; 100. mold. DETAILED DESCRIPTION

[0037] Many specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.

[0038] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] In the description of the present invention, reference terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.

[0041] The technical problem to be solved by the embodiment of the utility model is that although the extrusion molding process of the combination of a pre-extruder and a two-stage extruder has brought many advantages in the field of ceramic manufacturing, especially in the production of silicon carbide ceramics, it also has some technical disadvantages:

[0042] First, there is the problem of connection between the pre-extruder (including the clay kneading machine and the kneading machine) and the second-stage extruder. In the production process of silicon carbide ceramics, the pre-extruder is responsible for the initial shaping of the raw materials, and then transfers them to the second-stage extruder for further processing. However, due to the hardness and brittleness of silicon carbide ceramics, this connection process can easily lead to material breakage or cracks, especially at the moment of handover, the material is subjected to a large change in stress, increasing the risk of product damage.

[0043] Secondly, the adjustment and optimization of process parameters. The pre-extruder and the second-stage extruder each have different process parameters, such as extrusion pressure, temperature, speed, etc. When used in combination, how to ensure the coordination between these parameters to achieve the best molding effect is a technical problem. Once the parameters are set improperly, it will not only affect the molding quality of the product, but may also cause equipment damage or production interruption.

[0044] Furthermore, the complexity of the equipment increases the difficulty of maintenance. The extrusion molding process of the pre-extruder plus the second-stage extruder requires more equipment and control systems, which increases the complexity of the equipment and maintenance costs. At the same time, due to the particularity of silicon carbide ceramics, the wear and failure rate of the equipment is also relatively high, requiring more frequent maintenance and replacement of parts.

[0045] Finally, the limitation of production efficiency. Although the extrusion molding process of the combination of a pre-extruder and a two-stage extruder can improve the molding accuracy and quality of the product, its complex process and equipment requirements have become a factor restricting its application under the production requirements of high output, high efficiency, low energy consumption and low labor costs. The development of special high-hardness and high-wear-resistant extrusion tools, as well as the optimization of extrusion process parameters, have become the key to overcoming these difficulties.

[0046] Therefore, see Figure 1-3 As shown, the embodiment of the utility model discloses a three-stage extrusion molding device, comprising:

[0047] A vertically arranged frame 10, the frame comprising an upper layer 11, a middle layer 12 and a lower layer 13, each layer is provided with reinforcing ribs 15 for enhancing the strength of the frame, and a supporting foot 16 is provided at the bottom of the frame;

[0048] The primary extruder 20 is arranged on the upper layer 11, and includes a first feeding mechanism 21, a first extrusion barrel 22 and a first screw 23. The first screw 23 is arranged in the first extrusion barrel 22 for realizing preliminary extrusion. After preliminary crushing and mixing, the raw materials enter the primary extruder. The main function of the primary extruder is to perform preliminary plasticization and preforming on the raw materials, and to form preliminary bonding between the raw material particles through low-pressure and low-speed extrusion;

[0049] The second-stage extruder 30 is arranged in the middle layer 12, and includes a second feeding mechanism 31, a second extrusion barrel 32 and a second screw 33; the second screw 33 is arranged in the second extrusion barrel 32, and is used to realize secondary extrusion; the material after the primary extrusion molding is fed into the second-stage extruder, and the second-stage extruder can further increase the extrusion pressure and speed, further plasticize and compress the material, make the internal structure of the material more compact, and preliminarily form the desired shape;

[0050] The third-stage extruder 40 is arranged in the lower layer 13, and includes a third feeding mechanism 41, a third extrusion barrel 42, a third screw 43 and a mold. The third screw 43 is arranged in the third extrusion barrel 42, and is used to achieve final extrusion and molding through the mold 100; the third-stage extruder is used for the final molding and modification of the material. At this stage, the material is accurately molded into the desired shape under high pressure and high speed extrusion, and the internal structure is also highly densified.

[0051] The embodiment of the utility model creatively designs and implements a three-stage extruder arranged in layers in height, so that the material is gradually plasticized, densified and finally formed in a continuously controlled extrusion process, avoiding material inhomogeneity and discontinuity and improving production efficiency and quality.

[0052] In some embodiments, in combination Figure 1 and Figure 2 As shown, the length of the first screw 23 is smaller than that of the second screw 33, and the length of the second screw 33 is smaller than that of the third screw 43. Alternatively,

[0053] The aspect ratio of the first screw 23 is smaller than that of the second screw 33 , and the aspect ratio of the second screw 33 is smaller than that of the third screw 43 .

[0054] In an optional embodiment, the diameters of the first screw, the second screw and the third screw are the same, and their aspect ratios are 6, 8 and 10 respectively.

[0055] In some embodiments, the first feeding mechanism 21 includes a hopper 211, and the second feeding mechanism 31 and the third feeding mechanism 41 include a vacuum chamber (311, 411), which is arranged between the feeding mechanism and the end of the screw, and the plate body of the vacuum chamber can be selected as a transparent material, such as an acrylic plate.

[0056] In some embodiments, in combination Figure 1 and Figure 4 As shown, the screw inlet 312 of the vacuum chamber 311 is provided with a porous plate 27, the screw passes through the porous plate 27, and the end of the screw is provided with a cutting blade 28, that is, the cutting blade 28 is arranged in the vacuum chamber 311, and is used to cut the clay material entering the vacuum chamber through the porous plate 27. After being processed by the porous plate, the material is further broken up to form segmented clay materials with a diameter of several millimeters and a length of tens of millimeters, and the extruded air is removed through the vacuum chamber. In this way, the final extruded material can be made denser and the vacuuming can be made more effective.

[0057] In some embodiments, the rack 10 further comprises a bottom layer 14, on which at least one vacuum pump 50 is disposed, such as a vacuum pump, and the vacuum pump 50 is connected to the vacuum chamber (311, 411). It should be noted that the vacuum pumping intensity can be set to multiple levels as required.

[0058] In some embodiments, the first extrusion cylinder 22, the second extrusion cylinder 32, the third extrusion cylinder 42 and the mold are respectively provided with temperature sensors and / or pressure sensors 80; optionally, the temperature sensor and the pressure sensor 80 can be set at the end of the above-mentioned extrusion cylinder or the mold to detect the temperature of the material and the extrusion pressure it is subjected to.

[0059] The system further comprises a controller 90 , which is electrically connected to each sensor via a wire harness 70 . The controller 90 controls the operation of each extruder according to the parameters of each temperature sensor and pressure sensor 80 .

[0060] Optionally, in this embodiment, a temperature sensor and a pressure sensor are respectively provided on each layer of the three-stage extrusion molding equipment, and a temperature sensor and a pressure sensor are also provided on the mold, and they are connected to the controller 90. The controller 90 is linked with the water cooler according to the obtained temperature parameters, and the water cooler and the extruder are connected through a water cooling pipe 60. By controlling the temperature of the cooling water flowing through the extruder, the temperature inside the extruder is regulated; and the controller 90 automatically adjusts the motor speed according to the parameters of the real-time data of each pressure sensor 80, so as to achieve the pressure required by the extruder.

[0061] In some embodiments, in combination Figure 1As shown, a water jacket (37, 47) is provided in the shell of each of the extrusion cylinders (22, 32, 42) for achieving heat exchange through cooling water.

[0062] Furthermore, each of the screws (23, 33, 43) is provided with a through hole in the length direction, and cooling water passes through the through hole, and then the temperature of the material in the extrusion barrel is controlled by connecting and cooperating with the water cooling pipe 60 and the water cooling machine.

[0063] In some embodiments, the primary extruder 20, the secondary extruder 30, and the tertiary extruder 40 further include a first motor 25, a second motor 35, a third motor 45, and a first reducer 26, a second reducer 36, and a third reducer 46, respectively. Each of the reducers is provided with two parallel output shafts and two output interfaces, see Figure 1 and Figure 5 As shown, it includes screw connecting ports 38, 49 and stirring shaft connecting ports 29, 39, which are respectively connected to the screw and the stirring shaft. The two output connecting ports are not on the same plane. The axis of the stirring shaft is higher than the axis of the screw, and the screw and the stirring shaft can rotate forward or reverse, which is convenient for feeding, stirring and withdrawing operations, and improves the uniformity and strength of stirring.

[0064] Furthermore, the stirring shaft is arranged in each of the feeding mechanisms, and each of the screws passes through the feeding mechanism and the extrusion barrel, for example, can pass through a porous plate and enter into the vacuum chamber.

[0065] In an optional embodiment, the extrusion pressure and rotation speed of each screw in the primary extruder 20, the secondary extruder 30 and the tertiary extruder 40 are increased step by step. Preferably, the power of the first motor to the third motor is gradually increased, and a speed reduction mechanism is provided in the motor, for example, the power of the first motor is 7.5KW, the power of the second motor is 11KW, and the power of the third motor is 18.5KW.

[0066] In some optional embodiments, combined with Figure 4 As shown, the rotation directions of the screws 23, 33, 43 and the stirring shafts 24, 34, 44 are opposite, and the extrusion and stirring of the material are achieved in the feeding mechanism, which can increase the extrusion and stirring capabilities, and push the material forward under the spiral extrusion of the screw, and send the material into the vacuum chamber or the mold 100 after passing through the extrusion barrel.

[0067] The screw and the stirring shaft are provided with spiral blades, which are arranged in sections, so that maintenance is convenient. The damaged or severely worn blade segments can be directly replaced without replacing the entire screw or rotating blades, thereby reducing the use and maintenance costs.

[0068] Since the extrusion pressure in each stage of the extruder is continuously increasing, the screws can be manufactured from materials with continuously increasing strength and wear resistance. For example, the strength and wear resistance of the third screw are greater than those of the first and second screws. This can reduce maintenance time and cost and increase the overall service life of the equipment.

[0069] In some embodiments, the three-stage extrusion molding equipment is used for extrusion molding of ceramic products, particularly suitable for silicon carbide ceramic products; the inlet of the first feeding mechanism is connected to the outlet of the raw material mixer, thereby avoiding the use of a clay kneading machine or a kneading machine, and directly connecting to the mixer.

[0070] The above embodiments of the utility model can obtain the following advantages or effects:

[0071] First of all, the three-stage extrusion molding equipment has an innovative structural design. Compared with the traditional two-stage extruder and pre-extruder, the three-stage extrusion molding equipment is more compact in structure and more complete in function. It achieves fine control and efficient processing of silicon carbide ceramic raw materials through three-stage continuous extrusion. This design not only improves production efficiency, but also ensures the molding accuracy and stability of the products; and with the efficient feeding and discharging system, as well as the close cooperation with the extruders at each stage, the continuity and efficiency of the entire production process are achieved.

[0072] Secondly, the three-stage extrusion molding equipment is more accurate in controlling process parameters. The production of ceramics such as silicon carbide has extremely high requirements for process parameters, such as temperature, pressure, speed, etc., which all need to be precisely controlled. The three-stage extrusion molding equipment can achieve real-time monitoring and automatic adjustment of these parameters through advanced control systems. This not only ensures the stable quality of the products, but also improves the reliability and safety of production.

[0073] Thirdly, the three-stage extrusion molding equipment performs well in material adaptability. Silicon carbide ceramics have extremely high hardness and brittleness, and have extremely high requirements for processing equipment. The three-stage extrusion molding equipment improves the adaptability to silicon carbide ceramic raw materials by optimizing the extrusion die and processing technology. Whether it is particle size, distribution or molding difficulty, the three-stage extrusion molding equipment can easily cope with it, ensuring the molding quality and performance of the product.

[0074] In addition, three-stage extrusion molding equipment has also made positive contributions to energy conservation and emission reduction. By optimizing energy utilization and reducing waste generation, three-stage extrusion molding equipment reduces energy consumption and pollution emissions in the production process. This not only meets environmental protection requirements, but also reduces production costs for enterprises and improves economic benefits.

[0075] Finally, the application prospects of three-stage extrusion molding equipment are broad. With the increasing application of silicon carbide ceramics in aerospace, electronics, chemical and other fields, the quality and performance requirements of products are getting higher and higher. The three-stage extrusion molding equipment, with its high efficiency, stability and environmental protection, meets the demand for silicon carbide ceramic products in these fields. In the future, with the continuous advancement of technology and the optimization and upgrading of equipment, three-stage extrusion molding equipment will play a more important role in the production of silicon carbide ceramics.

[0076] In summary, the technological innovation of three-stage extrusion molding equipment in the production of silicon carbide ceramics is reflected in its structural design, process parameter control, material adaptability, energy conservation and emission reduction, and application prospects. Its emergence provides strong technical support for the long-term stable production of high-quality silicon carbide ceramics. It is an important technological innovation in the field of ceramic manufacturing and has brought revolutionary changes to the production of silicon carbide ceramics.

[0077] It should be noted that although the utility model is disclosed as above in the form of a preferred embodiment, it is not intended to limit the utility model. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope defined by the claims of the utility model.

Claims

1. A three-stage extrusion molding device, characterized in that: include: A vertically arranged rack, the rack comprising an upper layer, a middle layer and a lower layer; A primary extruder, arranged on the upper layer, comprising a first feeding mechanism, a first extrusion barrel and a first screw, wherein the first screw is arranged in the first extrusion barrel for achieving preliminary extrusion; A second-stage extruder, arranged in the middle layer, comprises a second feeding mechanism, a second extrusion barrel and a second screw; the second screw is arranged in the second extrusion barrel for realizing secondary extrusion; The third-stage extruder is arranged in the lower layer, and comprises a third feeding mechanism, a third extrusion barrel, a third screw and a die. The third screw is arranged in the third extrusion barrel to achieve final extrusion and molding through the die.

2. The three-stage extrusion molding equipment according to claim 1, characterized in that: The length of the first screw is shorter than that of the second screw, and the length of the second screw is shorter than that of the third screw; and / or, The aspect ratio of the first screw is smaller than that of the second screw, and the aspect ratio of the second screw is smaller than that of the third screw.

3. The three-stage extrusion molding equipment according to claim 1 is characterized in that: The first feeding mechanism comprises a hopper, and the second feeding mechanism and the third feeding mechanism comprise a vacuum chamber, wherein the vacuum chamber is arranged between the feeding mechanism and the end of the screw.

4. The three-stage extrusion molding equipment according to claim 3 is characterized in that: The inlet of the vacuum chamber is provided with a porous plate, the screw rod passes through the porous plate, and a cutting blade is provided at the end of the screw rod.

5. The three-stage extrusion molding equipment according to claim 3 or 4, characterized in that: The frame also includes a bottom layer, on which at least one vacuum pumping device is arranged, and the vacuum pumping device is connected to the vacuum chamber.

6. The three-stage extrusion molding equipment according to any one of claims 1 to 4, characterized in that: The first extrusion cylinder, the second extrusion cylinder, the third extrusion cylinder and the mold are respectively provided with temperature sensors and / or pressure sensors; The system further comprises a controller, wherein the controller controls the operation of each of the extruders according to the parameters of each of the temperature sensors and / or pressure sensors.

7. The three-stage extrusion molding equipment according to any one of claims 1 to 4, characterized in that: A water jacket is provided in the shell of each extrusion cylinder for achieving heat exchange through cooling water; and / or, A through hole is provided in the length direction of each screw rod, and cooling water passes through the through hole.

8. The three-stage extrusion molding equipment according to any one of claims 1 to 4, characterized in that: The primary extruder, the second-stage extruder, and the third-stage extruder also include a motor and a reducer, respectively. The reducer is provided with two parallel output shafts, which are respectively connected to the screw and the stirring shaft. The stirring shaft is provided on the feeding mechanism, and the screw passes through the feeding mechanism and the extrusion barrel; and / or, The extrusion pressure and rotation speed of each screw in the primary extruder, the second-stage extruder and the third-stage extruder are increased step by step.

9. The three-stage extrusion molding equipment according to claim 8, characterized in that: The screw and the stirring shaft rotate in opposite directions; and / or, The screw and the stirring shaft are provided with spiral blades, and the spiral blades are arranged in sections; and / or, The strength and / or wear resistance of the third screw is greater than the strength and / or wear resistance of the first screw and the second screw.

10. The three-stage extrusion molding device according to any one of claims 1 to 4, characterized in that: The three-stage extrusion molding equipment is used for extrusion molding of ceramic products, and the inlet of the first feeding mechanism is connected to the outlet of the raw material mixer.

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