Lightweight stepped wheel

Abstract

The utility model provides a kind of light weight grading wheel, including lower steel frame (including lower steel frame disc and lower steel frame tube sleeve), ceramic upper frame, ceramic blade support, multiple ceramic blades and ceramic bottom plate;Lower steel frame tube sleeve one end passes through lower steel frame disc center fixed, the other end extends preset height upwards;Ceramic upper frame detachably connects lower steel frame tube sleeve top, with lower steel frame tube sleeve coaxial;Ceramic blade support is sleeved in lower steel frame tube sleeve outer wall, between ceramic upper frame and lower steel frame disc, be equipped with multiple first blade through hole;Multiple ceramic blades respectively pass through the first blade through hole of ceramic blade support, one end abuts ceramic upper frame lower surface, the other end abuts lower steel frame disc upper surface;Ceramic bottom plate detachably connects lower steel frame disc lower surface;Ceramic upper frame, ceramic blade support, ceramic bottom plate and all ceramic blades are made of light weight high-strength wear-resistant material, can reduce wear and tear, prolong service life and reduce high-speed rotation inertia.

Description

Technical Field

[0001] This utility model relates to the field of material crushing equipment technology, and in particular to a lightweight grading wheel. Background Technology

[0002] Currently, classifiers are mainly classified into centrifugal classification, dynamic classification, and multi-stage series classification. In centrifugal classification, particles enter the classifier with the airflow and are subjected to the combined action of centrifugal force (outward) and airflow drag (inward); larger / heavier particles are thrown to the outside and collected due to the dominance of centrifugal force, while smaller / lighter particles are discharged through the gap between the impeller blades with the airflow.

[0003] In dynamic classification, the particle size can be flexibly controlled by adjusting the rotation speed of the classifying wheel, typically ranging from micrometers to hundreds of micrometers.

[0004] In multi-stage series separation, multiple classifiers connected in series can achieve a narrower particle size distribution or continuous multi-stage sorting.

[0005] However, the current grading wheel has the following problems:

[0006] 1. Wear problem: Under high-speed rotation, the particles cause severe wear on the impeller;

[0007] 2. High humidity or sticky materials may cause the impeller to become clogged;

[0008] 3. Under high-speed conditions, the heavier the grader wheel, the greater its inertia, and the higher its energy consumption.

[0009] 4. Short service life and frequent replacement.

[0010] Therefore, there is an urgent need for a lightweight grading wheel that can reduce wear, increase service life, and reduce inertia under high-speed rotation. Utility Model Content

[0011] The purpose of this invention is to provide a lightweight classifying wheel, which aims to solve the technical problems of severe wear on the impeller by particles under high-speed rotation and short service life in the prior art; and the high energy consumption caused by the large inertia of the classifying wheel under high speed conditions in carbon ceramic material classifying wheels.

[0012] To achieve the above objectives, this utility model provides a lightweight grading wheel, comprising:

[0013] The lower steel frame includes a lower steel frame plate and a lower steel frame sleeve. One end of the lower steel frame sleeve passes through the center of the lower steel frame plate in a vertical direction and is fixedly connected, while the other end extends upward to a predetermined height.

[0014] The ceramic upper frame includes an outer ring body and an inner ring body concentrically arranged with the outer ring body. The ceramic upper frame is detachably connected to the top of the lower steel frame sleeve through the inner ring body and is coaxially arranged with the lower steel frame sleeve.

[0015] A ceramic blade support is fitted onto the outer wall of the lower steel frame sleeve and located between the upper ceramic frame and the lower steel frame plate. The ceramic blade support is provided with multiple first blade through holes.

[0016] Multiple ceramic blades, each ceramic blade passing through a first blade through hole on the ceramic blade support, with one end of the ceramic blade abutting the lower surface of the upper ceramic frame and the other end abutting the upper surface of the lower steel frame plate;

[0017] A ceramic base plate is detachably connected to the lower surface of the lower steel frame plate;

[0018] The ceramic upper frame, ceramic blade support, ceramic base plate, and all ceramic blades are made of lightweight, high-strength, and wear-resistant materials. Preferably, they are made of any one of carbon ceramic material, carbon fiber material, silicon carbide fiber material, or silicon nitride fiber material.

[0019] As a further improvement to the above solution, the lightweight grading wheel also includes a lower liner plate and an upper liner plate. The lower liner plate and the upper liner plate are respectively provided with a plurality of second blade through holes, and the plurality of second blade through holes are arranged in a one-to-one correspondence with the first blade through holes on the ceramic blade support.

[0020] The upper liner is disposed on the lower surface of the outer ring body, and one end of the ceramic blade passes through the second blade on it and abuts against the lower surface of the outer ring body through a hole;

[0021] The lower liner is disposed on the upper surface of the lower steel frame disk, and the other end of the ceramic blade passes through the second blade on it and abuts against the upper surface of the lower steel frame disk through the hole.

[0022] As a further improvement to the above solution, the lightweight grading wheel also includes a first inner sleeve and a second inner sleeve. The first inner sleeve is sleeved on the outer wall of the lower steel frame sleeve, and one end of it abuts against the lower liner plate, and the other end abuts against the lower surface of the ceramic blade support.

[0023] The second inner sleeve is fitted onto the outer wall of the lower steel frame sleeve, with one end abutting against the upper liner plate and the other end abutting against the upper surface of the ceramic blade support.

[0024] As a further improvement to the above solution, the lower liner, the upper liner, the first inner sleeve and the second inner sleeve are all made of any one of carbon ceramic material, carbon fiber material, silicon carbide fiber material and silicon nitride fiber material.

[0025] As a further improvement to the above solution, a plurality of supporting ribs are provided between the outer ring body and the inner ring body, and the plurality of supporting ribs are evenly distributed along the circumference of the inner ring body to connect the outer ring body and the inner ring body into a whole.

[0026] As a further improvement to the above solution, the outer ring body includes a first annular body, the outer edge of the first annular body extending downward to form a first accommodating space, and the upper liner plate is disposed within the first accommodating space.

[0027] As a further improvement to the above solution, the inner ring body is provided with a number of first connecting through holes, and correspondingly, the top of the lower steel frame sleeve is provided with a number of first threaded holes.

[0028] The inner ring is detachably connected to the lower steel frame sleeve by screws.

[0029] As a further improvement to the above solution, the ceramic base plate includes a second annular body, the outer edge of the second annular body extending upward to form a second outer edge, constituting a second accommodating space, and the lower steel frame plate and the lower liner plate are stacked sequentially in the second accommodating space.

[0030] As a further improvement to the above solution, the second annular body is also provided with a number of second connecting through holes, and correspondingly, the lower steel frame plate is provided with a number of second threaded holes.

[0031] The ceramic base plate is detachably connected to the lower steel frame plate by screws.

[0032] Because this utility model adopts the above technical solutions, the beneficial effects of this application are as follows:

[0033] This invention provides a lightweight grading wheel. By using lightweight and wear-resistant materials for the upper frame, blades, and base plate, the wear resistance of the grading wheel is significantly enhanced, effectively reducing particle wear on the grading wheel under high-speed rotation and extending its service life. Simultaneously, the ceramic upper frame, ceramic blade support, ceramic base plate, and all ceramic blades are made of any one of the following materials: carbon ceramic, carbon fiber, silicon carbide fiber, and silicon nitride fiber. Compared to traditional materials such as zirconium oxide, this significantly reduces the overall weight of the grading wheel. Combined with the structural optimization of the lower steel frame, it reduces the overall inertia of the grading wheel under high-speed conditions, thereby reducing energy consumption and improving operating efficiency. Furthermore, the ceramic upper frame, blade support, and base plate adopt a detachable connection design, facilitating installation, disassembly, and replacement, reducing maintenance costs and improving the flexibility of equipment use. The ceramic upper frame and lower steel frame sleeve are coaxially arranged, and with the precise positioning of the ceramic blade support, the stability of the grading wheel during high-speed rotation is ensured, improving grading accuracy and operational reliability. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is a three-dimensional schematic diagram of a lightweight grading wheel disclosed in this utility model. Figure 1 ;

[0036] Figure 2 This is a three-dimensional schematic diagram of a lightweight grading wheel disclosed in this utility model. Figure 2 ;

[0037] Figure 3 This is a top view schematic diagram of a lightweight grading wheel disclosed in this utility model;

[0038] Figure 4 for Figure 3 BB cross-sectional diagram;

[0039] Figure 5 for Figure 4 AA sectional view;

[0040] Figure label:

[0041] 1. Lower steel frame; 11. Lower steel frame plate; 12. Lower steel frame pipe sleeve;

[0042] 2. Ceramic mounting frame; 21. Outer ring body; 211. First annular body; 212. First outer edge; 22. Inner ring body; 23. Supporting rib;

[0043] 3. Ceramic blade support; 31. First blade through hole;

[0044] 4. Ceramic blade; 5. Ceramic base plate; 51. Second annular body; 52. Second outer edge; 6. Lower liner plate; 7. Upper liner plate; 8. First inner sleeve; 9. Second inner sleeve.

[0045] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0048] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0049] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0050] See Figures 1-5 This utility model provides a lightweight grading wheel, comprising:

[0051] The lower steel frame 1 is the basic load-bearing structure, including a lower steel frame plate 11 and a lower steel frame sleeve 12. The lower steel frame plate 11 is disc-shaped with a through hole in the center. The lower steel frame sleeve 12 is a cylindrical tube. One end of the lower steel frame sleeve 12 passes vertically through the through hole in the center of the lower steel frame plate 11 and is fixedly connected to the lower steel frame plate 11 by welding or bolts. The other end extends upward to a predetermined height to support the ceramic upper frame 2.

[0052] The ceramic upper frame 2 includes an outer ring 21 and an inner ring 22 coaxially arranged (the inner ring 22 is coaxially arranged inside the outer ring 21). The outer ring 21 is circular and is used to fit with the inner wall of the grading chamber with a clearance. The inner ring 22 is coaxially arranged inside the outer ring 21. The inner diameter of the inner ring 22 is adapted to the outer diameter of the lower steel frame sleeve 12. It is fixed to the top of the lower steel frame sleeve 12 by a detachable connection to ensure that the ceramic upper frame 2 and the lower steel frame sleeve 12 are coaxial.

[0053] The ceramic blade 4 support member 3 is a ring bracket, which is sleeved on the outer wall of the lower steel frame sleeve 12 and is located axially between the upper ceramic frame 2 and the lower steel frame plate 11; the support member is evenly provided with a number of first blade passage holes 31 (the number of holes is the same as the number of ceramic blades 4) along the circumferential direction to guide the ceramic blades 4 through.

[0054] Several ceramic blades 4, each ceramic blade 4 corresponding to a first blade through hole 31 passing through the ceramic blade 4 support member 3, one end of which abuts against the lower surface of the ceramic upper frame 2, and the other end abuts against the upper surface of the lower steel frame plate 11.

[0055] The ceramic base plate 5 is a disc-shaped structure with a through hole in the center (fitting the outer diameter of the lower steel frame sleeve 12); the base plate is fixed to the lower surface of the lower steel frame plate 11 by a detachable connection, with a threaded hole on the lower surface of the lower steel frame plate 11 and a countersunk hole at the corresponding position on the base plate, which is locked by bolts;

[0056] The ceramic upper frame 2, ceramic blade 4 support 3, ceramic base plate 5, and all ceramic blades 4 are made of any one of the following materials: carbon ceramic, carbon fiber, silicon carbide fiber, and silicon nitride fiber.

[0057] This invention significantly enhances the wear resistance of the grading wheel by using lightweight and wear-resistant materials for the upper frame, blades, and base plate, effectively reducing particle wear on the grading wheel during high-speed rotation and extending its service life. Simultaneously, the ceramic upper frame 2, ceramic blade 4 support 3, ceramic base plate 5, and all ceramic blades 4 are made of any one of the following materials: carbon ceramic, carbon fiber, silicon carbide fiber, or silicon nitride fiber. Compared to traditional materials such as zirconium oxide, this reduces weight by approximately 50%. Combined with the structural optimization of the lower steel frame 1, it reduces the overall inertia of the grading wheel under high-speed conditions, thereby reducing energy consumption and improving operating efficiency. Furthermore, the ceramic upper frame 2, blade support, and base plate feature a detachable connection design, facilitating installation, disassembly, and replacement, reducing maintenance costs and improving the equipment's operational flexibility. The ceramic upper frame 2 and lower steel frame sleeve 12 are coaxially arranged, and with the precise positioning of the ceramic blade 4 support 3, the stability of the grading wheel during high-speed rotation is ensured, improving grading accuracy and operational reliability.

[0058] As a preferred embodiment, see Figure 4 The lightweight grading wheel also includes a lower liner plate 6 and an upper liner plate 7. The lower liner plate 6 and the upper liner plate 7 are respectively provided with a plurality of second blade passage holes, and the plurality of second blade passage holes are respectively provided with a one-to-one correspondence with the first blade passage holes 31 on the ceramic blade 4 support member 3.

[0059] The outer ring body 21 includes a first annular body 211, the outer edge of the first annular body 211 extends downward to form a first outer edge 212, which together with the lower surface of the first annular body 211 forms a first accommodating space. The upper liner 7 is disposed in the first accommodating space. The upper liner 7 is horizontally disposed in the first accommodating space and contacts the lower surface of the outer ring body 21.

[0060] The main body of the ceramic base plate 5 is the second annular body 51, and its outer edge extends upward to form a second outer edge 52, which together with the upper surface of the second annular body 51 forms a second accommodating space; the lower steel frame plate 11 is horizontally placed at the bottom of the second accommodating space, and the lower liner plate 6 is placed on the upper surface of the lower steel frame plate 11.

[0061] The ceramic blade 4 is a long strip structure, with its two ends passing through the second blade through holes of the upper liner plate 7 and the lower liner plate 6 respectively. One end abuts against the lower surface of the first annular body 211 of the outer ring 21, i.e., the bottom surface of the first receiving space, and the other end abuts against the upper surface of the lower steel frame plate 11. The upper liner plate 7 and the lower liner plate 6 are respectively limited by the first receiving space and the second receiving space. The second blade through holes on them correspond one-to-one with the first blade through holes 31 of the ceramic blade 4 support member 3, which can accurately guide the installation of the ceramic blade 4 and avoid deviation. This achieves the positioning of the ceramic blade 4 in the circumferential and radial directions and ensures that the blades are evenly distributed in the circumferential direction. The two ends of the ceramic blade 4 abut against the lower surface of the outer ring 21 and the upper surface of the lower steel frame plate 11 respectively. With the clamping action of the liner plate, the vibration of the blade during operation can be reduced and the service life of the grading wheel can be extended.

[0062] In a preferred embodiment, the lightweight grading wheel further includes a first inner sleeve 8 and a second inner sleeve 9. The first inner sleeve 8 is a tubular structure, sleeved on the outer wall of the lower steel frame sleeve 12, with its lower end face abutting against the upper surface of the lower liner plate 6 and its upper end face abutting against the lower surface of the ceramic blade 4 support member 3. The second inner sleeve 9 is also a tubular structure, coaxially sleeved on the outer wall of the lower steel frame sleeve 12, with its upper end face abutting against the lower surface of the upper liner plate 7 and its lower end face abutting against the upper surface of the ceramic blade 4 support member 3.

[0063] The first inner sleeve 8, by abutting against the lower surface of the ceramic blade 4 support 3 and the lower liner 6, limits the axial downward movement of the ceramic blade 4 support 3. The second inner sleeve 9, by abutting against the upper liner 7 and the upper surface of the ceramic blade 4 support 3, limits the axial upward movement of the ceramic blade 4 support 3, thus providing bidirectional axial constraint on the ceramic blade 4 support 3. The first inner sleeve 8 and the second inner sleeve 9 apply abutting forces from the upper and lower sides of the ceramic blade 4 support 3, respectively, restricting the axial displacement of the classifying wheel and preventing the ceramic blade 4 support 3 from loosening due to equipment vibration or load changes, thereby improving the stability of the classifying wheel operation. The sleeve structure between the inner sleeve and the lower steel frame sleeve 12 can disperse the radial load transmitted by the ceramic blade 4 axially to the liner and the ceramic blade 4 support 3, reducing local stress concentration and extending the service life of key components (such as the ceramic blade 4 and the ceramic base plate 5).

[0064] In a preferred embodiment, the lower liner 6, upper liner 7, first inner sleeve 8, and second inner sleeve 9 of the grading wheel are all made of high-performance lightweight materials. Optional materials include, but are not limited to, any one of carbon-ceramic composite materials, carbon fiber reinforced resin matrix composite materials, silicon carbide fiber reinforced ceramic matrix composite materials, or silicon nitride fiber reinforced ceramic matrix composite materials; wherein:

[0065] The lower liner plate 6 and the upper liner plate 7 serve as axial limiting components for the ceramic blade 4. Their materials must have sufficient rigidity to support the ceramic blade 4 and transmit radial loads. At the same time, they must match the coefficient of linear expansion of the ceramic blade 4 to avoid separation caused by thermal stress.

[0066] The first inner sleeve 8 and the second inner sleeve 9 serve as axial limiting components for the support member 3 of the ceramic blade 4. Their materials must have good wear resistance and fatigue resistance to withstand the cyclic load when the classifier rotates at high speed.

[0067] The lower liner plate 6, upper liner plate 7 and other components are made of lightweight and high-strength materials such as carbon ceramic and carbon fiber. Their density is only 1 / 3 to 1 / 2 of that of traditional steel. Under the premise of achieving the same rigidity and wear resistance, the weight of the components can be significantly reduced. At the same time, the low coefficient of friction of the materials can also reduce the wear of the ceramic blades 4 when they slide and extend the maintenance cycle of the grader wheel.

[0068] In a preferred embodiment, the outer ring body 21 and the inner ring body 22 are connected as a whole by a number of support ribs 23. Specifically, the support ribs 23 are axially extending plate-shaped or columnar structures, evenly distributed along the circumference of the inner ring body 22, for example, 4 to 8, the specific number of which can be adjusted according to the size of the grader wheel; their two ends are fixedly connected to the inner wall of the first annular body 211 of the outer ring body 21 and the outer wall of the inner ring body 22, respectively; the integrated design of the support ribs 23 with the outer ring body 21 and the inner ring body 22 reduces additional connection processes and reduces assembly errors.

[0069] In a preferred embodiment, the inner ring 22 is provided with a plurality of first connecting through holes, and correspondingly, the top of the lower steel frame sleeve 12 is provided with a plurality of first threaded holes. During assembly, the inner ring 22 is fitted onto the outer wall of the top of the lower steel frame sleeve 12, so that the first connecting through holes are coaxially aligned with the first threaded holes of the lower steel frame sleeve 12. Then, screws are inserted into the first connecting through holes in sequence and screwed into the first threaded holes to achieve a detachable and fixed connection between the inner ring 22 and the lower steel frame sleeve 12.

[0070] The second annular body 51 is also provided with a number of second connecting through holes, and correspondingly, the lower steel frame plate 11 is provided with a number of second threaded holes;

[0071] The ceramic base plate 5 is detachably connected to the lower steel frame plate 11 by screws. During assembly, the ceramic base plate 5 is placed below the lower steel frame plate 11, so that the second connecting through hole is coaxially aligned with the second threaded hole of the lower steel frame plate 11. Then, screws (such as countersunk screws) are inserted into the second connecting through hole and screwed into the second threaded hole in sequence to achieve a detachable fixed connection between the ceramic base plate 5 and the lower steel frame plate 11.

[0072] The inner ring 22, ceramic base plate 5, and corresponding components are detachably connected by screws, eliminating the need for irreversible fixing methods such as welding or riveting. Assembly is completed simply by aligning the through holes and threaded holes and tightening the screws. When the inner ring 22 or ceramic base plate 5 experiences wear, breakage, or other malfunctions, the screws can be directly removed for replacement, significantly reducing maintenance time. When only the inner ring 22 or ceramic base plate 5 needs replacement, the entire grading wheel does not need to be scrapped; only the faulty component needs to be replaced, significantly reducing component replacement costs and meeting the requirements of green manufacturing and a circular economy.

[0073] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A lightweight grading wheel, characterized in that, include: The lower steel frame includes a lower steel frame plate and a lower steel frame sleeve. One end of the lower steel frame sleeve passes through the center of the lower steel frame plate in a vertical direction and is fixedly connected, while the other end extends upward to a predetermined height. The ceramic upper frame includes an outer ring body and an inner ring body concentrically arranged with the outer ring body. The ceramic upper frame is detachably connected to the top of the lower steel frame sleeve through the inner ring body and is coaxially arranged with the lower steel frame sleeve. A ceramic blade support is fitted onto the outer wall of the lower steel frame sleeve and located between the upper ceramic frame and the lower steel frame plate. The ceramic blade support is provided with multiple first blade through holes. Multiple ceramic blades, each ceramic blade passing through a first blade through hole on the ceramic blade support, with one end of the ceramic blade abutting the lower surface of the upper ceramic frame and the other end abutting the upper surface of the lower steel frame plate; A ceramic base plate is detachably connected to the lower surface of the lower steel frame plate; The ceramic upper frame, ceramic blade support, ceramic base plate, and all ceramic blades are made of lightweight, high-strength, and wear-resistant materials.

2. The lightweight grading wheel according to claim 1, characterized in that, The lightweight grading wheel also includes a lower liner plate and an upper liner plate. The lower liner plate and the upper liner plate are respectively provided with a plurality of second blade through holes, and the plurality of second blade through holes are arranged one-to-one with the first blade through holes on the ceramic blade support. The upper liner is disposed on the lower surface of the outer ring body, and one end of the ceramic blade passes through the second blade on it and abuts against the lower surface of the outer ring body through a hole; The lower liner is disposed on the upper surface of the lower steel frame disk, and the other end of the ceramic blade passes through the second blade on it and abuts against the upper surface of the lower steel frame disk through the hole.

3. A lightweight grading wheel according to claim 2, characterized in that, The lightweight grading wheel also includes a first inner sleeve and a second inner sleeve. The first inner sleeve is sleeved on the outer wall of the lower steel frame sleeve, and one end of it abuts against the lower liner plate, and the other end abuts against the lower surface of the ceramic blade support. The second inner sleeve is fitted onto the outer wall of the lower steel frame sleeve, with one end abutting against the upper liner plate and the other end abutting against the upper surface of the ceramic blade support.

4. A lightweight grading wheel according to claim 3, characterized in that, The lower liner, upper liner, first inner sleeve, and second inner sleeve are all made of any one of the following materials: carbon ceramic, carbon fiber, silicon carbide fiber, and silicon nitride fiber.

5. A lightweight grading wheel according to any one of claims 1-4, characterized in that, A plurality of supporting ribs are provided between the outer ring body and the inner ring body, and the plurality of supporting ribs are evenly distributed along the circumference of the inner ring body to connect the outer ring body and the inner ring body into a whole.

6. A lightweight grading wheel according to any one of claims 2-4, characterized in that, The outer ring body includes a first annular body, the outer edge of the first annular body extends downward to form a first accommodating space, and the upper liner is disposed within the first accommodating space.

7. A lightweight grading wheel according to any one of claims 1-4, characterized in that, The inner ring body is provided with a number of first connecting through holes, and correspondingly, the top of the lower steel frame sleeve is provided with a number of first threaded holes. The inner ring is detachably connected to the lower steel frame sleeve by screws.

8. A lightweight grading wheel according to any one of claims 2-4, characterized in that, The ceramic base plate includes a second annular body, the outer edge of which extends upward to form a second outer edge, constituting a second receiving space. The lower steel frame plate and the lower liner plate are stacked sequentially within the second receiving space.

9. A lightweight grading wheel according to claim 8, characterized in that, The second annular body is also provided with a number of second connecting through holes, and correspondingly, the lower steel frame plate is provided with a number of second threaded holes; The ceramic base plate is detachably connected to the lower steel frame plate by screws.

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