Pug extrusion force uniformizing device and method for honeycomb ceramic structural body processing

Abstract

The invention provides a pug extrusion force uniformizing device and a pug extrusion force uniformizing method for processing a honeycomb ceramic structural body, which can effectively solve the quality problem of the honeycomb ceramic structural body caused by non-uniform extrusion force when the honeycomb ceramic structural body is produced by adopting an extruder. The extruding machine extension body is arranged between an extruding head of an extruding machine and a honeycomb structure body extruding die, the extruding machine extension body comprises a smooth inner cavity, and the two ends of the inner cavity are communicated with a discharging port of the extruding head and a feeding port of the honeycomb structure body extruding die respectively. A first spoiler is arranged on the side, close to the extrusion head, of the inner cavity, a second spoiler is arranged on the side, close to the honeycomb structure body extrusion die, of the inner cavity, and variable-diameter holes are formed in the first spoiler and the second spoiler.

Description

Technical Field

[0001] The invention relates to the technical field of silicon carbide honeycomb ceramic structure processing, in particular to a device and method for uniforming mud extrusion force for processing honeycomb ceramic structures. Background Art

[0002] At present, in the processing of honeycomb structures, in order to improve production efficiency, a continuous extruder with a spiral thrust is generally used. The extruder is started to allow the mud to be extruded through the honeycomb structure mold under pressure. The mud forms the desired honeycomb structure through the mold. After the honeycomb structure is extruded, it is cooled by a cooling device to fix its shape. Finally, the continuous honeycomb structure is cut into specific lengths or shapes as needed.

[0003] The advantage of using a continuous extruder is that it can realize continuous extrusion production without stopping the machine to add materials. At the same time, there are also some problems. In particular, the spiral pusher will cause the thrust to be uneven, with small thrust in the middle and large thrust in the periphery. This will cause the whole product to bend, the end face to be irregular, the grid diamond shape, and the loose hole wall in the middle to the extrusion production of the honeycomb ceramic structure. Therefore, solving the uniform distribution of extrusion force in the extrusion production of honeycomb ceramic structures is an urgent problem to be solved. Summary of the invention

[0004] In view of the above problems, the present invention provides a device and method for uniform clay extrusion force for processing honeycomb ceramic structures, which can effectively solve the quality problem of honeycomb ceramic structures caused by uneven extrusion force when producing honeycomb ceramic structures using an extruder.

[0005] The technical solution is as follows: a mud extrusion force uniformization device for processing honeycomb ceramic structures, comprising an extruder extension body, wherein the extruder extension body is arranged between the extrusion head of the extruder and the honeycomb structure extrusion die, the extruder extension body comprises a unobstructed inner cavity, the two ends of the inner cavity are respectively connected with the discharge port of the extrusion head and the feed port of the honeycomb structure extrusion die, a first spoiler is arranged on the side of the inner cavity close to the extrusion head, and a second spoiler is arranged on the side of the inner cavity close to the honeycomb structure extrusion die, and the first spoiler and the second spoiler are provided with variable diameter holes.

[0006] Furthermore, the size of the variable diameter hole on the first spoiler is greater than the size of the variable diameter hole on the second spoiler.

[0007] Furthermore, the diameter of the variable-diameter holes on the first spoiler is 6.5 mm-7.2 mm, and the diameter of the variable-diameter holes on the second spoiler is 4.8 mm-5.3 mm.

[0008] Furthermore, the length of the extruder extension body in the direction from the extrusion head to the honeycomb structure extrusion die is 140 mm-160 mm.

[0009] Furthermore, flange connection parts are respectively provided at both ends of the extruder extension body, and the extruder extension body is connected to the extrusion head via the flange connection parts.

[0010] Furthermore, the honeycomb structure extrusion die is fixed together with the extruder extension body through the die flange and the flange connecting part.

[0011] Furthermore, the thickness of the first spoiler is 14 mm-16 mm, and the thickness of the second spoiler is 7 mm-9 mm.

[0012] Furthermore, a slot is provided on one side of the inner cavity close to the extrusion head, the first spoiler is provided in the slot, and an installation slot is provided on one side of the inner cavity close to the honeycomb structure extrusion die, the second spoiler is provided in the installation slot.

[0013] Furthermore, the second spoiler is 22 mm to 26 mm away from the honeycomb structure extrusion die.

[0014] A method for uniforming the extrusion force of clay for processing a honeycomb ceramic structure, characterized by comprising the following steps:

[0015] An extruder extension is arranged between the extrusion head of the extruder and the honeycomb structure extrusion die, wherein the extruder extension comprises a smooth inner cavity, and two ends of the inner cavity are respectively connected to the discharge port of the extrusion head and the feed port of the honeycomb structure extrusion die;

[0016] A first spoiler is arranged on a side of the inner cavity close to the extrusion head, and a second spoiler is arranged on a side of the inner cavity close to the honeycomb structure extrusion die, wherein the first spoiler and the second spoiler are provided with diameter-changing holes;

[0017] The mud material with rotational force extruded by the extrusion head of the extruder removes the rotational force after passing through the reducing hole of the first spoiler. When the mud material passes through the reducing hole of the second spoiler again, the extrusion pressure reaches a completely uniform state. After two diameter changes, the mud material enters the honeycomb structure extrusion mold for molding with completely uniform pressure.

[0018] The device for uniformizing the mud extrusion force for processing honeycomb ceramic structures of the present invention effectively improves the thrust distribution of mud extrusion by arranging an extension body and a reducer plate, can avoid defects of honeycomb ceramic structure products caused by uneven thrust, greatly reduces the problems of bending, irregular end faces, rhombus lattice and loose hole walls in the middle of the honeycomb ceramic structure products, and improves the overall quality of the honeycomb ceramic structure. By arranging an extended extruder, the extrusion path of the mud is extended, and the internal stress of the mud is fully released. The mud has more sufficient time and space for shaping during the extrusion process, reducing internal stress and preventing product bending and loose hole walls. Combined with the installation of a first spoiler, the flow velocity and pressure distribution of the mud are adjusted to make the thrust more uniform. By installing a second spoiler, the flow of the mud is further adjusted in the final stage to ensure uniform pressure distribution when entering the mold, avoiding grid deformation and loose hole walls. The flow path and pressure distribution of the mud are adjusted by the cooperation of the extension body and the two reducers, so that the extrusion force is more uniform and product defects caused by uneven thrust are reduced. The use of the mud extrusion force uniformity device and method for processing honeycomb ceramic structures of the present invention can significantly reduce problems such as product bending, uneven end faces, lattice rhombuses, and loose intermediate hole walls, improve the overall quality and consistency of the product, reduce the scrap rate caused by quality problems, and improve production continuity and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a device for uniforming the extrusion force of clay used for processing a honeycomb ceramic structure in an embodiment;

[0020] Figure 2 is a schematic diagram of a first spoiler in one embodiment;

[0021] Figure 3 is a schematic cross-sectional view of a first spoiler along the AA direction in one embodiment;

[0022] Figure 4 is a schematic diagram of a second spoiler in one embodiment;

[0023] Figure 5 is a schematic cross-sectional view of a second spoiler along the BB direction in one embodiment;

[0024] Figure 6 A schematic diagram of the steps of a method for making the clay extrusion force uniform for processing a honeycomb ceramic structure in an embodiment;

[0025] Figure 7 A schematic diagram of a honeycomb ceramic structure produced by the prior art at a first viewing angle;

[0026] Figure 8It is a schematic diagram of a honeycomb ceramic structure produced by using the clay material extrusion force uniforming device for processing a honeycomb ceramic structure of the present invention at a first viewing angle;

[0027] Fig. 9 A schematic diagram of a honeycomb ceramic structure produced by the prior art at a second viewing angle;

[0028] Fig.10 It is a schematic diagram of a honeycomb ceramic structure produced by using the device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure of the present invention at a second viewing angle;

[0029] Fig.11 A schematic diagram of a honeycomb ceramic structure produced by the prior art at a third viewing angle;

[0030] Fig.12 It is a schematic diagram of a honeycomb ceramic structure produced by using the mud extrusion force uniformizing device for processing a honeycomb ceramic structure of the present invention at a third viewing angle. DETAILED DESCRIPTION

[0031] See Figure 1 The present invention provides a device for uniformizing the extrusion force of mud for processing a honeycomb ceramic structure, comprising an extruder extension 1, which is arranged between an extrusion head 2 of the extruder and a honeycomb structure extrusion die 3. The extruder extension 1 comprises a smooth inner cavity 101, and the two ends of the inner cavity 101 are respectively connected with a discharge port of the extrusion head 2 and a feed port of the honeycomb structure extrusion die 3. A first spoiler 4 is arranged on a side of the inner cavity close to the extrusion head 2, and a second spoiler 5 is arranged on a side of the inner cavity close to the honeycomb structure extrusion die 3. Variable diameter holes 7 are arranged on the first spoiler 5 and the second spoiler 6.

[0032] See Figures 2 to 5 Specifically in the present invention, the variable diameter holes 7 can be evenly distributed on the first spoiler 5 and the second spoiler 6, and the size of the variable diameter holes on the first spoiler 5 is larger than the size of the variable diameter holes on the second spoiler 6.

[0033] Specifically, in one embodiment, the diameter of the variable hole on the first spoiler 5 is 6.5mm-7.2mm, and the diameter of the variable hole on the second spoiler 6 is 4.8mm-5.3mm. By limiting the diameter of the variable hole 7 on the first spoiler 5 and the second spoiler 6, the flow rate and pressure of the mud during the extrusion process can be adjusted. The appropriate aperture can increase the resistance to the mud, so that the pressure of the mud increases and the flow rate decreases when the mud passes through the variable plate, which helps to achieve a more uniform distribution of extrusion force. However, if the diameter of the variable plate is too large, it cannot provide enough resistance to evenly distribute the extrusion force, resulting in the mud in the middle part being loose due to insufficient thrust. On the contrary, if the diameter of the variable plate is too small, the extrusion resistance will be increased, resulting in excessive overall extrusion resistance, affecting production efficiency, and may cause product deformation or extrusion difficulties, ultimately affecting product quality.

[0034] In the embodiment, by precisely controlling the aperture of the variable plate, the extrusion molding process of the mud material can be optimized to ensure that each cell of the honeycomb ceramic structure can be evenly filled with mud, thereby ensuring the shape and structural stability of the product. By setting an appropriate variable plate between the extruder extension body and the extrusion die, the stress concentration inside the mud material can be effectively reduced, thereby reducing the risk of problems such as bending and misalignment of the end face of the product during the extrusion process.

[0035] Specifically in the present invention, the length of the extruder extension 1 in the direction from the extrusion head 2 to the honeycomb structure extrusion die 3 is 140mm-160mm. The extruder extension 1 can increase the stroke of the mud material, so that the mud material can be more fully uniform before entering the extrusion die. In the embodiment, by setting the extruder extension 1 to a suitable length, the pressure distribution of the mud material during the extrusion process can be optimized, and product quality problems caused by uneven pressure can be reduced. The appropriate length of the extruder extension 1 can also adjust the fluidity of the mud material so that it reaches the best plasticized state before entering the die, which is conducive to forming a uniform honeycomb structure. Controlling the length of the extension body can avoid excessive resistance and ensure the smooth progress of the extrusion process. The appropriate extension body length can ensure that the mud material flows smoothly during the extrusion process and improve production efficiency.

[0036] By using the clay material extrusion force uniformity device for processing honeycomb ceramic structures in the embodiment, when the clay material with rotational force passes through the small hole with a diameter of 6.5-7.3mm on the first spoiler 5, 80-90% of the rotational force is directly unloaded, so that the clay material extrusion force is relatively uniform, and when the clay material passes through the small hole with a diameter of 4.8-5.3mm on the second spoiler 6 again, the extrusion force is basically completely uniform. After two diameter changes, the clay material enters the mold molding in a completely uniform pressure state, which can solve the problems of bending of the whole product, irregular end face, rhombus lattice, loose hole wall in the middle part caused by uneven extrusion force.

[0037] Specifically in one embodiment of the present invention, the thickness of the first spoiler is 14mm-16mm, and the thickness of the second spoiler is 7mm-9mm. Setting the first spoiler and the second spoiler to appropriate thickness can ensure that the mud is more evenly distributed when passing through the variable diameter plate, thereby reducing product defects caused by uneven material distribution.

[0038] Specifically, in one embodiment of the present invention, flange connection parts 102 are respectively provided at both ends of the extruder extension body 1, and the extruder extension body 1 is connected to the extrusion head 2 through the flange connection part 102. At the other end, the honeycomb structure extrusion mold 3 cooperates with the flange connection part 102 through the mold flange 4 and is fixed together with the extruder extension body 1. The connection of the flange structure can be achieved by bolts.

[0039] In order to fix the first spoiler 5 and the second spoiler 6, the first spoiler 5 can be fixed by setting a slot matching the size of the first spoiler 5 on the extruder extension 1. In other embodiments, the slot can also be on the extrusion head 2, or a part of the slots can be set on the extruder extension 1 and the extrusion head 2 to support the fixation of the first spoiler. The first reducer 5 is placed in the slot, and the first spoiler 6 is fixed by connecting and fixing the flange connection part 102 to the extrusion head 2. The second spoiler can be set by setting a step-shaped or slot-shaped mounting groove in the extruder extension body, and the second spoiler can be set to fit tightly with the inner cavity 101.

[0040] Specifically, in one embodiment of the present invention, the second spoiler 6 is 22mm-26mm away from the honeycomb structure extrusion die. The position of the second spoiler 6 will affect the pressure of the mud at the entrance of the die. The appropriate distance can provide sufficient pressure to ensure that the mud can fill the die smoothly and evenly, while avoiding extrusion problems caused by excessive or insufficient pressure, which helps to optimize the flow characteristics of the mud in the die and improve the dimensional accuracy and surface quality of the product.

[0041] Figure 7 A schematic diagram of a honeycomb ceramic structure produced by the prior art at a first viewing angle; Figure 8 Schematic diagram of a honeycomb ceramic structure produced by using the device for uniforming the extrusion force of a clay material for processing a honeycomb ceramic structure according to the present invention at a first viewing angle; Figure 7 and Figure 8 Before the solution of the present invention is adopted, the 120mm honeycomb ceramic structure bends by 0.5mm-2mm. After the device and method of the present invention are adopted, the bend is only 0mm-0.5mm, which significantly improves the bend of the whole product caused by uneven extrusion force.

[0042] Fig. 9 is a schematic diagram of a honeycomb ceramic structure produced by the prior art at a second viewing angle, Fig.10 The figure is a schematic diagram of a honeycomb ceramic structure produced by using the device for uniform clay extrusion force for processing a honeycomb ceramic structure according to the present invention at a second viewing angle. Before the scheme of the present invention is adopted, the end face of the honeycomb ceramic structure is not straight, and the qualified rate of the mesh of the honeycomb ceramic structure is only 75%. After the device and method of the present invention are adopted, the qualified rate exceeds 95%, the end face of the honeycomb ceramic structure is square, and the probability of diamond-shaped meshes is greatly reduced;

[0043] Fig.11 is a schematic diagram of a honeycomb ceramic structure produced by the prior art at a third viewing angle, Fig.11 It can be seen that the honeycomb ceramic structure has a black-gray middle part with loose pore walls. Fig.12 It is a schematic diagram of a honeycomb ceramic structure produced by using the mud extrusion force uniformizing device for processing honeycomb ceramic structures of the present invention at a third viewing angle. The looseness of the pore walls in the middle part of the ceramic structure is significantly reduced, and the problem of looseness in the middle is basically solved.

[0044] See Figure 6 In an embodiment of the present invention, a method for uniforming the extrusion force of a clay material used in processing a honeycomb ceramic structure is also provided. The method can be implemented based on the device for uniforming the extrusion force of a clay material used in processing a honeycomb ceramic structure in the above embodiment. The method comprises the following steps:

[0045] Step 1: an extruder extension is arranged between an extrusion head of an extruder and an extrusion die of a honeycomb structure, wherein the extruder extension comprises a smooth inner cavity, and two ends of the inner cavity are respectively connected to a discharge port of the extrusion head and a feed port of the extrusion die of the honeycomb structure;

[0046] Step 2: a first spoiler is arranged on a side of the inner cavity close to the extrusion head, and a second spoiler is arranged on a side of the inner cavity close to the honeycomb structure extrusion die, wherein the first spoiler and the second spoiler are provided with a variable diameter hole;

[0047] Step 3: The mud material with rotational force extruded by the extrusion head of the extruder removes the rotational force after passing through the reducing hole of the first spoiler. When the mud material passes through the reducing hole of the second spoiler again, the extrusion pressure reaches a completely uniform state. After two diameter changes, the mud material enters the honeycomb structure extrusion mold for molding with completely uniform pressure.

[0048] In the present invention, an experimental control group is also set to test the effects of different parameter settings on production efficiency and product quality. The length of the extruder extension, the aperture of the second spoiler, and the aperture of the first spoiler are respectively used as control variables to study their effects on the extrusion production of the honeycomb ceramic structure. Each control group will consider a parameter separately and keep the other parameters within the recommended range. Other equipment including the mold and the extruder also remain unchanged. The following Table 1 is a table of experimental design and results:

[0049] Table 1

[0050]

[0051]

[0052] illustrate:

[0053] (1) In the experimental control group, the extruder extension length control group was:

[0054] Control group A1: The length of the extended body of the extruder is 150 mm, between 140 mm and 160 mm.

[0055] Control group B1: The length of the extended body of the extruder is 170 mm, which exceeds 160 mm.

[0056] Control group C1: The length of the extended body of the extruder is 130 mm, which is less than 140 mm.

[0057] Analysis of the impact of changes in the length of the extruder extension:

[0058] The experimental results of control group A1: moderate extrusion resistance, high production efficiency and good product quality.

[0059] Experimental results of control group B1: the extrusion resistance increased, affecting production efficiency.

[0060] Experimental results of control group C1: The internal stress of the clay material cannot be fully released, resulting in problems such as product bending, crooked end faces, rhombus-shaped lattices, and loose hole walls in the middle.

[0061] Considering the effect of the length of the extended body of the extruder alone, exceeding or falling short of the recommended range in the embodiment will affect production efficiency and product quality.

[0062] (2) Second spoiler aperture control group:

[0063] Control group A2: The aperture of the second spoiler is 5.1 mm, between 4.8 mm and 5.3 mm.

[0064] Control group B2: The aperture of the second spoiler is 4.9 mm, which is smaller than 4.8 mm.

[0065] Control group C2: The aperture of the second spoiler is 6.0 mm, which is larger than 5.3 mm.

[0066] Analysis of the impact of the change in the aperture of the second spoiler:

[0067] The experimental results of control group A2: the extrusion resistance is moderate, the mud thrust is uniform, and the product quality is good.

[0068] Experimental results of control group B2: extrusion resistance increased and production efficiency decreased.

[0069] Experimental results of control group C2: The uniform thrust effect of the mud material is poor, which affects the product quality.

[0070] Considering the influence of the aperture of the second spoiler separately, it is proved that exceeding or falling below the recommended range will affect the uniformity of mud thrust, production efficiency and product quality.

[0071] (3) First spoiler aperture control group:

[0072] Control group A3: The aperture of the first spoiler is 6.6 mm, between 6.5 mm and 7.2 mm.

[0073] Control group B3: the aperture of the first spoiler is 8 mm, which is larger than 7.2 mm.

[0074] Control group C3: The aperture of the first spoiler is 5.5 mm, which is smaller than 6.5 mm.

[0075] Analysis of the impact of the change in the aperture of the first spoiler:

[0076] The experimental results of control group A3: the extrusion resistance is moderate, the mud thrust is uniform, and the product quality is good.

[0077] Experimental results of control group B3: The uniform thrust effect of the mud material is poor, which affects the product quality.

[0078] Experimental results of control group C3: extrusion resistance increased and production efficiency decreased.

[0079] Considering the influence of the aperture of the first spoiler separately, it is proved that exceeding or falling below the recommended range will affect the uniformity of mud thrust, production efficiency and product quality.

[0080] Through the setting of the above control group and the analysis of the experimental results, it can be clearly seen that under the specific point values ​​set by the present invention, the influence of the length of the extended body of the extruder, the aperture of the second spoiler and the aperture of the first spoiler on the extrusion production of the honeycomb ceramic structure. The settings of the control groups A1, B1, and C1 are all within the recommended parameter range, and it is expected that good extrusion effects, production efficiency, and product quality will be obtained. However, the settings of the control groups A2 and A3, B2 and B3, and C2 and C3 exceed the recommended range, and it is expected that there will be different degrees of increased extrusion resistance, decreased production efficiency, and product quality problems. These results verify the effect of controlling the length of the extended body of the extruder, the aperture of the second spoiler, and the aperture of the first spoiler within the specific range provided by the present invention.

[0081] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0082] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for uniforming the extrusion force of clay for processing honeycomb ceramic structures, characterized in that: It includes an extruder extension body, which is arranged between the extrusion head of the extruder and the honeycomb structure extrusion die. The extruder extension body includes a smooth inner cavity, and the two ends of the inner cavity are respectively connected with the discharge port of the extrusion head and the feed port of the honeycomb structure extrusion die. A first spoiler is arranged on the side of the inner cavity close to the extrusion head, and a second spoiler is arranged on the side of the inner cavity close to the honeycomb structure extrusion die, and the first spoiler and the second spoiler are provided with variable diameter holes.

2. The device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure according to claim 1, characterized in that: The size of the variable diameter hole on the first spoiler is greater than the size of the variable diameter hole on the second spoiler.

3. The device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure according to claim 2, characterized in that: The diameter of the variable diameter hole on the first spoiler is 6.5 mm-7.2 mm, and the diameter of the variable diameter hole on the second spoiler is 4.8 mm-5.3 mm.

4. The device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure according to claim 2, characterized in that: The length of the extruder extension body in the direction from the extrusion head to the honeycomb structure extrusion die is 140 mm-160 mm.

5. The device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure according to claim 1, characterized in that: Both ends of the extruder extension body are also provided with flange connection parts respectively, and the extruder extension body is connected with the extrusion head through the flange connection parts.

6. The device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure according to claim 5, characterized in that: The honeycomb structure extrusion die is matched with the flange connection part through the die flange and is fixed together with the extruder extension body.

7. The device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure according to claim 3, characterized in that: The thickness of the first spoiler is 14 mm-16 mm, and the thickness of the second spoiler is 7 mm-9 mm.

8. The device for uniforming the extrusion force of clay for processing a honeycomb ceramic structure according to claim 1, characterized in that: A slot is provided on one side of the inner cavity close to the extrusion head, the first spoiler is provided in the slot, and an installation slot is provided on one side of the inner cavity close to the honeycomb structure extrusion die, the second spoiler is provided in the installation slot.

9. The device for uniforming the extrusion force of clay materials for processing honeycomb ceramic structures according to claim 1, characterized in that: The second spoiler is 22 mm to 26 mm away from the honeycomb structure extrusion die.

10. A method for uniforming the extrusion force of clay materials for processing honeycomb ceramic structures, characterized in that: The following steps are involved: An extruder extension is arranged between the extrusion head of the extruder and the honeycomb structure extrusion die, wherein the extruder extension comprises a smooth inner cavity, and two ends of the inner cavity are respectively connected to the discharge port of the extrusion head and the feed port of the honeycomb structure extrusion die; A first spoiler is arranged on a side of the inner cavity close to the extrusion head, and a second spoiler is arranged on a side of the inner cavity close to the honeycomb structure extrusion die, wherein the first spoiler and the second spoiler are provided with diameter-changing holes; The mud material with rotational force extruded by the extrusion head of the extruder removes the rotational force after passing through the reducing hole of the first spoiler. When the mud material passes through the reducing hole of the second spoiler again, the extrusion pressure reaches a completely uniform state. After two diameter changes, the mud material enters the honeycomb structure extrusion mold for molding with completely uniform pressure.

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