An extruder for producing catalyst supports
By setting up a multi-stage shearing structure in the screw and barrel, the problem of insufficient shearing force in a single-screw extruder is solved, achieving efficient mixing of the catalyst carrier and improving the mixing uniformity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- RENQIU NORTH CHINA PETROLEUM CLEAN ENVIROMENTAL PROTECTION CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-03
AI Technical Summary
Existing single-screw extruders have insufficient shear force in catalyst carrier production, resulting in poor mixing uniformity and difficulty in effectively breaking down the agglomeration force between material particles.
The screw has staggered screw ribs and first shear blades, and a second shear blade is fixed in a spiral distribution on the inner wall of the barrel, forming a multi-stage shearing structure to enhance the shearing force of the material. Through the synergistic effect of the screw ribs, the first shear blade, and the second shear blade, the mixing path and intensity are increased.
It significantly improves the mixing uniformity of catalyst powder and binder, breaks the agglomeration force between material particles, and significantly improves the mixing quality.
Smart Images
Figure CN224446803U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of extrusion machine technology, and in particular to an extrusion machine for producing catalyst carriers. Background Technology
[0002] The catalyst carrier extruder is a specialized device used to extrude mixtures of catalyst powder and binders into strips of a specific shape. Its working principle involves first mixing the catalyst powder and binder evenly and feeding it into the feed inlet. The rotating screw compresses, shears, and plasticizes the material within the barrel, then conveys it forward, ultimately extruding it into strips through specific shaped openings in the forming die.
[0003] The shearing in a single-screw extruder primarily relies on the relative motion between the screw and the barrel. However, this method generates relatively small shearing forces, making it difficult to adequately shear the material and effectively break down the agglomeration forces between material particles, thus affecting subsequent mixing and molding quality. Furthermore, single-screw mixing mainly involves pushing the material forward through the screw's rotation. During this pushing process, friction and agitation occur between the material and the screw, the barrel's inner wall, and among the material itself. However, this mixing method is relatively simple, and the material's mixing path is relatively singular, resulting in poor mixing uniformity.
[0004] Therefore, this application provides an extruder for the production of catalyst supports to solve the problems mentioned in the background art. Utility Model Content
[0005] The purpose of this invention is to provide an extruder for the production of catalyst supports, which solves the problems of difficulty in fully shearing materials and poor uniformity of mixing in the prior art.
[0006] To solve the above-mentioned technical problems, this utility model provides an extruder for the production of catalyst carriers, including a base, a motor installed on one side of the top surface of the base body, the motor being coaxially connected to the input shaft of a gear reducer via a coupling, the output shaft of the gear reducer being connected to a screw, the screw being disposed inside a barrel, and the barrel being supported on the base by several supports; the screw includes a rod body, with multiple sets of helical ridges and first shear blades arranged alternately along the axial direction; second shear blades are fixedly arranged spirally on the inner wall of the barrel, the second shear blades extending into the gap between adjacent helical ridges and adjacent first shear blades, for enhancing the shearing and mixing of materials.
[0007] A further improvement of this utility model is that: an integrally formed flange is provided on one side of the barrel body, the flange is connected to the bearing seat by bolts, a tapered roller bearing is installed in the bearing seat for rotating one end of the support screw; one end of the screw extends out of the bearing seat and is coaxially connected to the output shaft of the gear reducer through a coupling.
[0008] A further improvement of this utility model is that an integrally formed flange is provided on the other side of the barrel body, and the flange is connected to the forming head by bolts.
[0009] A further improvement of this utility model is that a feed inlet is provided at the top of the end of the barrel near the gear reducer, and a feed hopper is provided inside the feed inlet.
[0010] A further improvement of this utility model is that a check ring is provided at one end of the screw near the gear reducer, and a screw ridge is provided on one side of the check ring on the screw. The cross-section of the screw ridge is circular, and the gap between the screw ridge and the inner wall of the barrel is 0.1~0.35mm. Each turn of the screw ridge is provided with an opening, and the arc length of the opening accounts for 15%-25% of the circumference of the screw ridge, which is used to prevent material accumulation.
[0011] A further improvement of this utility model is that: a spiral first shearing blade is provided on one side of the screw rib, and the second shearing blade has a trapezoidal structure. The first shearing blade is evenly distributed along the axial direction of the screw and there are no less than three of them. The height of the second shearing blade is 1 / 5 to 1 / 3 of the height of the first shearing blade.
[0012] A further improvement of this utility model is that a spiral second shearing blade is provided on the inner wall of the barrel. The second shearing blade is in the form of a spiral ring and extends into the gap between the spiral ridges. The height of the second shearing blade is 1 / 5 to 1 / 4 of the height of the spiral ridges.
[0013] A further improvement of this utility model is that the second shearing blade has a multiple spaced-apart arc-shaped structure.
[0014] A further improvement of this utility model is that a number of second shearing blades are spirally distributed within the gap between the first shearing blade and the spiral edge.
[0015] A further improvement of this utility model is that the height of the second shearing piece is 1 / 5 to 1 / 3 of the height of the first shearing piece.
[0016] By adopting the above technical solution, this utility model has the following beneficial effects:
[0017] 1. This utility model provides an extruder for producing catalyst supports. The extruder forms a primary shear flow field by sequentially and alternately arranging screw ribs and first shear blades on the screw. A spiral second shear blade, fixed to the inner wall of the barrel, is arranged in the gap between adjacent screw ribs and first shear blades, forming a multi-stage shear structure. This results in the material being subjected to stronger shear force during extrusion, effectively breaking down the agglomeration forces between material particles and allowing for more thorough dispersion of the catalyst powder and binder mixture, thus improving mixing uniformity. Compared to traditional single-screw extruders, this extruder not only relies on the relative motion between the screw and barrel to generate shear force but also increases the mixing path and mixing intensity of the material through the synergistic effect of the first and second shear blades, and the screw ribs and second shear blades. This causes the material to be repeatedly sheared, folded, and mixed in different directions and positions, significantly improving mixing quality and solving the problem of insufficient shear force in traditional single-screw extruders. Attached Figure Description
[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0019] Figure 1 This is an overall schematic diagram of an extruder used for producing catalyst supports;
[0020] Figure 2 for Figure 1 A schematic diagram of the screw substructure in the diagram;
[0021] Figure 3 This is a schematic diagram of the mechanism of the barrel in Example 1;
[0022] Figure 4 This is a schematic diagram of the spiral ridge structure;
[0023] Figure 5 This is a schematic diagram of the structure of the first shear plate;
[0024] Figure 6 This is a schematic diagram of the structure of the second shear plate in Example 1;
[0025] Figure 7 This is a schematic diagram of the structure of the spiral ridge and the second shear plate in Example 1;
[0026] Figure 8 This is a schematic diagram of the structure of the first and second shearing blades in Example 1;
[0027] Figure 9 This is a cross-sectional view of the barrel in Example 2;
[0028] Figure 10 This is a schematic diagram of the structure of the second shearing piece in Example 2;
[0029] Figure 11 This is a schematic diagram of the structure of the spiral ridge and the second shear plate in Example 2;
[0030] Figure 12 This is a schematic diagram of the structure of the first and second shearing blades in Example 2;
[0031] Reference numerals: 1. Base; 2. Motor; 3. Gear reducer; 4. Screw; 5. Barrel; 6. Support; 7. Bearing seat; 8. Forming head; 41. Rod body; 42. Screw rib; 43. First shearing blade; 44. Second shearing blade; 45. Check ring; 51. Flange; 52. Feed inlet; 53. Feed hopper; 421. Opening. Detailed Implementation
[0032] The technical solution of this utility model will now be clearly and completely described 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 scope of protection of this utility model.
[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] The present invention will be further explained below with reference to specific embodiments.
[0036] Example 1
[0037] like Figures 1-8 As shown, this embodiment provides an extruder for producing catalyst supports, including a base 1. A motor 2 is installed on one side of the top surface of the base 1. The motor 2 is coaxially connected to the input shaft of a gear reducer 3 via a coupling. The output shaft of the gear reducer 3 is connected to a screw 4. The screw 4 is installed inside a barrel 5. The barrel 5 is supported on the base 1 by several supports 6. The barrel 5 is also equipped with existing structures and equipment such as a heating device, a cooling channel, and a temperature control device, which will not be described in detail here. The screw 4 includes a rod body 41. Multiple sets of spiral ribs 42 and first shearing blades 43 are arranged alternately along the axial direction on the rod body 41. Second shearing blades 44 are fixedly arranged in a spiral distribution on the inner wall of the barrel 5. The second shearing blades 44 extend into the gap between adjacent spiral ribs 42 and adjacent first shearing blades 43 to enhance the shearing and mixing of materials. This extruder forms a primary shear flow field by sequentially and alternately arranging screw ribs 42 and first shear blades 44 on the four screws. A second shear blade 44, a spiral fixed to the inner wall of the barrel 5, is placed in the gap between adjacent screw ribs 42 and first shear blades 44, forming a multi-stage shear structure. This results in the material being subjected to stronger shear force during extrusion, effectively breaking down the agglomeration forces between material particles and allowing for more thorough dispersion of the catalyst powder and binder mixture, thus improving mixing uniformity. Compared to traditional single-screw extruders, this extruder not only relies on the relative motion between the screw 4 and the barrel 5 to generate shear force, but also increases the mixing path and mixing intensity of the material through the synergistic effect of the first and second shear blades 43 and 44, and the screw ribs 42 and 44. This causes the material to be repeatedly sheared, folded, and mixed in different directions and positions, significantly improving mixing quality and solving the problem of insufficient shear force in traditional single-screw extruders.
[0038] like Figure 2 As shown, in this embodiment, an integrally formed flange 51 is provided on one side of the barrel 5 body. The flange 51 is connected to the bearing seat 7 by bolts. A tapered roller bearing is installed in the bearing seat 7 for rotating one end of the support screw 4. One end of the screw 4 extends out of the bearing seat 7 and is coaxially connected to the output shaft of the gear reducer 3 through a coupling. The gear reducer 3 is matched with the motor 2 to achieve high torque and low energy consumption operation. An integrally formed flange 51 is also provided on the other side of the barrel 5 body. The flange 51 is connected to the forming head 8 by bolts. The gear reducer 3, the motor 2, and the forming head 8 are all existing equipment and will not be described in detail here. A feed inlet 52 is provided at the top of the barrel 5 near the gear reducer 3. A feed hopper 53 is provided in the feed inlet 52 for adding materials.
[0039] like Figure 2As shown, in this embodiment, a check ring 45 is provided on one end of the screw 4 near the gear reducer 3. The check ring 45 prevents the material from flowing backward through mechanical limiting, ensuring unidirectional extrusion conveying. A screw ridge 42 is provided on one side of the check ring 45 on the screw 4. The cross-section of the screw ridge 42 is circular. The gap between the screw ridge 42 and the inner wall of the barrel 5 is 0.1~0.35mm, which balances the sealing performance and friction, preventing material leakage and maintaining normal extrusion pressure, and enhancing the shearing and mixing efficiency. Each turn of the screw ridge 42 is provided with an opening 421. The arc length of the opening 421 accounts for 15%-25% of the circumference of the screw ridge 42, which can effectively prevent the material from accumulating in the gap between the screw ridge 42 and the inner wall of the barrel 5, avoiding problems such as equipment jamming or increased wear caused by material accumulation, and providing initial shearing. A spiral first shearing blade 43 is provided on one side of the screw ridge 42. The first shearing blade 43 has a trapezoidal shape structure and is evenly distributed along the axial direction of the screw 4, with no less than three blades. The height of the second shearing blade 44 is 1 / 5 to 1 / 3 of the height of the first shearing blade 43. The first shearing blade 43 is used to shear the material and works in conjunction with the second shearing blade 44. The second shearing blade 44 extends into the gap between adjacent first shearing blades 43, causing the material to be sheared at different positions and directions, thereby enhancing the shearing effect and improving the mixing uniformity. A spiral second shearing blade 44 is provided on the inner wall of the barrel 5. The second shearing blade 44 is in the shape of a spiral ring and extends into the gap between the spiral ridges 42. The height of the second shearing blade 44 is 1 / 5 to 1 / 4 of the height of the spiral ridges 42. It extends into the gap between the spiral ridges. The annular shearing on the inner wall of the barrel is used for shearing while pushing, dispersing material clumps and improving the mixing uniformity. The synergistic effect of the spiral ridges 42, the opening 421 and the second shearing blade 44 makes the material subject to stronger shearing force during extrusion, which can effectively break the agglomeration force between material particles, so that the mixture of catalyst powder and binder can be more fully dispersed and the mixing uniformity can be improved.
[0040] Example 2
[0041] like Figures 9-12 As shown, the difference between this embodiment and Embodiment 1 lies in that a spiral second shearing blade 44 is provided on the inner wall of the barrel 5. The second shearing blade 44 has a plurality of spaced arc-shaped structures. Several second shearing blades 44 are spirally distributed within the gaps between the first shearing blade 43 and the spiral ridge 42. The height of the second shearing blade 44 is 1 / 5 to 1 / 3 of the height of the first shearing blade 43. The lower height of the second shearing blade 44 allows for more precise shearing of the material, avoiding over-shearing that could damage the material. In conjunction with the first shearing blade 43, a layered shearing system is formed, causing the material to be subjected to different degrees of shearing force at different heights and positions.
[0042] This utility model also provides the working principle of an extruder for catalyst carrier production: During use, the material is fed into the feed hopper 53, passing through the feed inlet 53 into the inner barrel 5. A section of screw ribs 42 is directly below the feed inlet 53, propelling the material forward. The material is positioned in front of the screw ribs 42 at the feed inlet 53. A second shearing plate 44 is installed on the inner wall of the barrel 5, extending into the gap between the screw ribs 42. The height of the second shearing plate 44 is 1 / 5 to 1 / 4 of the height of the screw ribs 42. The material passes through the annular ring on the inner wall of the barrel. The shearing process is used to advance and shear, disperse material clumps, and improve mixing uniformity. The screw ribs 42 are configured with different pitches according to the existing screw 4, based on the feeding section, compression section, and homogenization section. A first shearing blade 43 is positioned in front of the screw ribs 42 to form a shearing section. The material advanced by the screw ribs 42 is pushed towards the first shearing blade 43 for shearing. The first shearing blade 43 is used to shear the material and cooperates with a second shearing blade 44. The second shearing blade 44 extends into the gap between adjacent first shearing blades 43, causing the material to be sheared at different positions and directions, enhancing the shearing effect and improving mixing uniformity. Multiple sets of screw ribs 42 and first shearing blades 43 are sequentially and interlaced along the shaft 41, and the second shearing blade 44 cooperate to perform thorough shearing and mixing. Finally, the sheared and mixed material is extruded from the forming head 8 into strips of a specific shape.
[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An extruder for catalyst carrier production, characterized by, The machine includes a base (1), a motor (2) is installed on one side of the top surface of the base (1), the motor (2) is coaxially connected to the input shaft of the gear reducer (3) through a coupling, the output shaft of the gear reducer (3) is connected to a screw (4), the screw (4) is installed inside the barrel (5), the barrel (5) is supported on the base (1) by several supports (6); the screw (4) includes a rod body (41), the rod body (41) is arranged with multiple sets of screw ribs (42) and first shearing blades (43) in an axial direction; the inner wall of the barrel (5) is fixed with spirally distributed second shearing blades (44), the second shearing blades (44) extend into the gap between adjacent screw ribs (42) and adjacent first shearing blades (43) to enhance the shearing and mixing of materials.
2. The extruder for catalyst carrier production according to claim 1, wherein An integrally formed flange (51) is provided on one side of the barrel (5). The flange (51) is connected to the bearing housing (7) by bolts. A tapered roller bearing is installed in the bearing housing (7) for rotating one end of the support screw (4). One end of the screw (4) extends out of the bearing housing (7) and is coaxially connected to the output shaft of the gear reducer (3) through a coupling.
3. The extruder for catalyst carrier production according to claim 2, wherein On the other side of the barrel (5) body, an integrally formed flange (51) is also provided, and the flange (51) is connected to the forming head (8) by bolts.
4. The extruder for catalyst carrier production according to claim 3, wherein A feed inlet (52) is provided at the top of the end of the barrel (5) near the gear reducer (3), and a feed hopper (53) is provided inside the feed inlet (52).
5. The extruder for catalyst carrier production according to claim 2, wherein A check ring (45) is provided on one end of the screw (4) near the gear reducer (3). A screw ridge (42) is provided on one side of the check ring (45) on the screw (4). The cross-section of the screw ridge (42) is circular. The gap between the screw ridge (42) and the inner wall of the barrel (5) is 0.1~0.35mm. Each turn of the screw ridge (42) is provided with an opening (421). The arc length of the opening (421) accounts for 15%-25% of the circumference of the screw ridge (42) to prevent material accumulation.
6. An extruder for catalyst carrier production according to claim 5, characterized in that A spiral first shearing blade (43) is provided on one side of the screw rib (42), and a second shearing blade (44) has a trapezoidal structure. The first shearing blade (43) is evenly distributed along the axial direction of the screw (4) and there are no less than three of them. The height of the second shearing blade (44) is 1 / 5 to 1 / 3 of the height of the first shearing blade (43).
7. The extruder for catalyst carrier production according to claim 5, wherein The inner wall of the barrel (5) is provided with a spiral second shearing blade (44). The second shearing blade (44) is in the shape of a spiral ring and extends into the gap between the spiral ridges (42). The height of the second shearing blade (44) is 1 / 5 to 1 / 4 of the height of the spiral ridges (42).
8. The extruder for catalyst carrier production according to claim 5, wherein The second shear plate (44) has multiple spaced arc-shaped structures.
9. The extruder for catalyst carrier production according to claim 8, wherein Several second shear blades (44) are spirally distributed in the gap between the first shear blade (43) and the spiral edge (42).
10. The extruder for catalyst carrier production according to claim 9, wherein The height of the second shearing piece (44) is 1 / 5 to 1 / 3 of the height of the first shearing piece (43).