Graded material distribution sieve plate, thermal vibration sieve, grate type heat removal device and slag material distribution method

Abstract

The invention provides a grading material distribution sieve plate, a thermal vibration sieve, a grate type heat removal device and a slag material distribution method, and relates to the technical field of steel slag treatment equipment.The grading material distribution sieve plate comprises a sieve plate frame structure, a sieve bar assembly and a leakage-proof structure, the sieve bar assembly is arranged on the sieve plate frame structure and can form a plurality of non-linear sieve holes, and the leakage-proof structure is arranged on the sieve plate frame structure; the multiple non-linear sieve holes are distributed in a radial mode, and the hole diameters of the non-linear sieve holes are gradually increased in the direction from the feeding end to the discharging end of the sieve plate frame structure; the leakage-proof structures are arranged on the sieve plate frame structure and arranged at the two ends of the sieve strip assembly, and the leakage-proof structures are used for preventing material leakage. Nonlinear efficient grading is achieved, the service life is prolonged, the technical requirement for efficient, stable and economical recovery of the molten steel slag can be better met, the method is particularly suitable for extremely severe working conditions such as waste heat recovery of the molten steel slag, and the technical requirement for efficient, stable and economical recovery is met.

Description

Technical Field

[0001] This invention relates to the field of steel slag treatment equipment technology, and in particular to a graded feeding screen plate, a thermal vibrating screen, and a method for feeding steel slag. Background Technology

[0002] Steel slag, a major byproduct of steel production, has an annual output exceeding 100 million tons. Currently, mature treatment processes meeting ultra-low emission requirements mainly include pool-type hot quenching, pressurized hot quenching, drum-type hot quenching, and air quenching. Among these, pool-type and pressurized hot quenching have a long history of development and mature technology, and are widely used in converter steel slag treatment. The process principle of pool-type and pressurized hot quenching involves pouring high-temperature steel slag into a special container, cooling it with water spray, and controlling the ambient pressure to stabilize the free calcium oxide in the slag. After multiple generations of technological iteration, the existing systems have achieved a high level of automation and equipment, are highly adaptable to the fluidity and alkalinity of steel slag, are easy to operate, and run stably, making them one of the most economically efficient mainstream processes. The drum-type hot quenching uses high-speed rotating equipment to impact and crush molten steel slag, and utilizes air or atomized water for rapid cooling. It has advantages such as high processing efficiency, a clean working environment, and low infrastructure and maintenance costs. Steel slag treated by the drum-type hot quenching method has uniform particle size and good stability, and can be directly used in building materials and other fields. However, the drum process carries the risk of explosion due to the intense contact between water and high-temperature molten slag, and it requires high fluidity of the feed slag, limiting its application in certain conditions. Air quenching is a dry granulation technology that uses high-pressure airflow to impact and granulate molten steel slag and rapidly cool it, while recovering some sensible heat, offering advantages in water and energy conservation. Air-quenched steel slag particles have high hardness and low f-CaO content, but significant internal residual stress, potentially leading to phase transformation problems later on. Furthermore, air quenching is noisy and only suitable for liquid slag with good fluidity; it typically needs to be used in conjunction with other processes to handle steel slag of different morphologies.

[0003] Since steel slag can reach temperatures of up to 1550℃ when it exits the furnace, it contains a large amount of high-quality waste heat, equivalent to the calorific value of approximately 50 kg of standard coal per ton of electric arc furnace slag. However, existing mainstream processes such as pool-type hot quenching, pressurized hot quenching, and drum methods are unable to effectively recover this heat, resulting in energy waste. Against this backdrop, developing a new generation of steel slag treatment technologies and equipment that combine high-efficiency processing with waste heat utilization has become an inevitable direction for the industry, especially the flap valve equipment used in the storage and transportation of steel slag, which also faces the need for upgrading.

[0004] Existing linear screens employ parallel arrangements of conical bars, wider at the top and narrower at the bottom, creating a screen gap structure that gradually narrows from top to bottom. On one hand, the processing and precision control of these conical bars are difficult, increasing costs. On the other hand, the screen gaps between the conical bars change linearly, while steel slag generally consists of slag with a wide range of particle sizes. When large-diameter steel slag particles cannot fall off the linear screen in time, they accumulate, affecting subsequent screening efficiency. This is particularly problematic when linear screens are used in extreme conditions such as high-temperature, high-vibration, and high-wear recovery of molten steel slag waste heat, leading to insufficient screening efficiency, easy material accumulation, short structural lifespan, and high maintenance costs. Therefore, achieving efficient nonlinear grading and extending service life to meet the technical requirements of efficient, stable, and economical recovery of molten steel slag has become an urgent technical challenge. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a grading and feeding screen plate, a thermal vibrating screen and a steel slag feeding method, which realizes non-linear and efficient grading and improves service life to meet the technical requirements of efficient, stable and economical recycling of molten steel slag.

[0006] The above-mentioned objective of this invention can be achieved by the following technical solution: This invention provides a grading material distribution screen plate, comprising:

[0007] Sieve plate frame structure;

[0008] A screen bar assembly is disposed on the screen plate frame structure. The screen bar assembly can form multiple non-linear screen holes. Along the feed end to the discharge end of the screen plate frame structure, the multiple non-linear screen holes are arranged radially, and the aperture of the non-linear screen holes gradually increases.

[0009] A leak-proof structure is provided on the screen plate frame structure and placed at both ends of the screen bar assembly. The leak-proof structure is used to prevent material leakage.

[0010] In a preferred embodiment of the present invention, the screen bar assembly includes a plurality of screen bars detachably disposed on the screen plate frame structure, the feed ends of the plurality of screen bars are arranged radially around a preset arc, and a nonlinear screen hole is formed between adjacent screen bars.

[0011] In a preferred embodiment of the present invention, the cross-section of the sieve bar is rectangular, circular, or elliptical.

[0012] In a preferred embodiment of the present invention, the leak-proof structure includes a first wear-resistant plate and a second wear-resistant plate. The first wear-resistant plate is disposed at the feed end of the screen plate frame structure and connected to the feed end of the screen bar assembly. The top surface of the first wear-resistant plate and the screen bar assembly are disposed on the same plane. The second wear-resistant plate is disposed at the discharge end of the screen plate frame structure and connected to the discharge end of the screen bar assembly. The top surface of the second wear-resistant plate and the screen bar assembly are disposed on the same plane.

[0013] In a preferred embodiment of the present invention, the first wear-resistant plate includes a first arcuate side edge connecting the feed end of each of the screen bars, the first arcuate side edge forming the preset arc, and the second wear-resistant plate includes a second arcuate side edge connecting at least a portion of the discharge end of the screen bars.

[0014] In a preferred embodiment of the present invention, the screen plate frame structure includes a frame and a plurality of support beams disposed on the frame. The plurality of support beams are arranged at intervals along the direction from the feed end to the discharge end of the screen plate frame structure, and the support beams are used to support each screen bar.

[0015] In a preferred embodiment of the present invention, the support beam is arranged in an arc shape.

[0016] In a preferred embodiment of the present invention, the sieve plate frame structure further includes a plurality of sieve bar supports disposed on the sieve plate frame structure, and each sieve bar is detachably connected to at least one sieve bar support.

[0017] In a preferred embodiment of the present invention, the screen bar support is provided with at least one support reinforcing rib.

[0018] The present invention also provides a thermal vibrating screen, including the aforementioned grading and fabrication screen plate.

[0019] The present invention also provides a grate-type heat extraction device, including a grate plate and the aforementioned thermal vibrating screen, wherein the thermal vibrating screen is disposed above the grate plate, and the conveying direction of the thermal vibrating screen is the same as the movement direction of the grate plate.

[0020] The present invention also provides a slag material distribution method, which is implemented using the aforementioned grate-type heat extraction device. The slag material distribution method includes the following steps:

[0021] Install the grading and fabric sieve plate onto the thermal vibrating screen;

[0022] The thermal vibrating screen is arranged above the grate-type heat extraction device, and the conveying direction of the thermal vibrating screen is the same as the movement direction of the grate plate.

[0023] The granulated steel slag is conveyed to the thermal vibrating screen, and the steel slag is graded and distributed by the grading and distributing screen plate so that the steel slag falls onto the grate plate of the grate-type heat exchange device in order of particle size, forming a material layer with the particle size gradually decreasing from top to bottom.

[0024] The material on the screen of the thermal vibrating screen falls to the top of the material layer, completing the particle size classification and material distribution.

[0025] The technical solution of the present invention has the following significant beneficial effects:

[0026] The grading and feeding screen plate of this invention employs radially arranged nonlinear screen holes, with the holes gradually increasing in size from the feed end to the discharge end, thereby enabling nonlinear screening of materials. During vibrating screening, the movement trajectory of the material on the grading and feeding screen plate is not an ideal straight line. The radial layout, combined with the vibration of the screening machine, produces unique mechanical effects (such as varying centrifugal force). This makes the screening process exhibit more complex nonlinear characteristics than simple linear screen holes, causing the material to generate complex movement trajectories on the screen surface of the screen bar assembly, including sliding, tumbling, and centrifugal diffusion. This effectively avoids the problem of insufficient grading caused by the material easily passing through a straight channel quickly in traditional linear screen holes. Thus, it can better handle materials with a wide particle size distribution, significantly improving the grading accuracy and screening efficiency of molten steel slag materials with a wide particle size distribution and irregular shape. It achieves stepwise separation of fine, medium, and coarse particles, thereby greatly improving screening efficiency and screening quality.

[0027] Because the non-linear screen holes on the screen bar assembly are arranged radially and gradually increase in size, the two ends of the screen bar assembly are asymmetrical. This invention, by setting anti-leakage structures at both ends of the screen bar assembly, can prevent some molten slag particles from leaking from the asymmetrical ends of the screen bar assembly, thus improving the screening rate. Furthermore, the screen plate frame structure can stably support the screen bar assembly under vibration, enhancing stability under thermal shock conditions and preventing cracking and failure of the screen bar assembly caused by thermal deformation or mechanical vibration, significantly extending its service life.

[0028] The grading and feeding screen plate of this invention achieves non-linear and efficient grading and improves service life to meet the technical requirements of efficient, stable and economical recovery of molten steel slag. It is particularly suitable for extreme and harsh working conditions such as waste heat recovery of molten steel slag, and meets the technical requirements of efficient, stable and economical recovery. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0031] Figure 1 This is a top view schematic diagram of one embodiment of the graded fabric sieve plate of the present invention;

[0032] Figure 2 This is a side view of one embodiment of the screen bar and screen bar support described in this invention.

[0033] Figure 3 This is a schematic front view of one embodiment of the screen bar and screen bar support described in this invention;

[0034] Figure 4 This is a schematic diagram of one embodiment of the thermal vibrating screen described in this invention.

[0035] The reference numerals in the above figures are as follows:

[0036] 10. Grading screen plate;

[0037] 20. Thermal vibrating screen;

[0038] 100. Screen plate frame structure; 110. Frame; 120. Support beam; 130. Screen bar support;

[0039] 200. Screen bar assembly; 210. Non-linear screen aperture; 220. Screen bar;

[0040] 300. Leak-proof structure; 310. First wear-resistant plate; 311. First arc-shaped side edge; 320. Second wear-resistant plate; 321. Second arc-shaped side edge. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0042] Implementation Method 1

[0043] Please refer to the following: Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a grading and feeding screen plate 10, which includes a screen plate frame structure 100, a screen bar assembly 200, and a leak-proof structure 300. The screen bar assembly 200 is disposed on the screen plate frame structure 100 and can form a plurality of nonlinear screen holes 210. The plurality of nonlinear screen holes 210 are arranged radially, and the aperture of the nonlinear screen holes 210 gradually increases along the direction from the feed end to the discharge end of the screen plate frame structure 100. The leak-proof structure 300 is disposed on the screen plate frame structure 100 and placed at both ends of the screen bar assembly 200. The leak-proof structure 300 is used to prevent material leakage.

[0044] Overall, the grading screen plate 10 uses radially arranged non-linear screen holes 210, and the non-linear screen holes 210 gradually increase in size from the feed end to the discharge end, thereby enabling non-linear screening of materials.

[0045] During the vibrating screening process, the movement trajectory of the material on the grading and feeding screen plate 10 is not an ideal straight line. The radial layout, combined with the vibration of the screening machine, produces unique mechanical effects (such as varying centrifugal force). This makes the screening process of the material exhibit more complex nonlinear characteristics than that of a simple linear screen, causing the material to generate complex movement trajectories on the screen surface of the screen bar assembly 200, including sliding, rolling, and centrifugal diffusion. This effectively avoids the problem of insufficient grading caused by the material easily passing through a straight channel quickly in traditional linear screens. As a result, it can better handle materials with a wide particle size distribution, significantly improving the grading accuracy and screening efficiency of molten steel slag materials with a wide particle size distribution and irregular shape. It achieves the stepwise separation of fine, medium, and coarse particles, thereby greatly improving the efficiency and quality of screening operations.

[0046] Because the nonlinear screen holes 210 on the screen bar assembly 200 are arranged radially and gradually increase in size, the two ends of the screen bar assembly 200 are asymmetrical. This invention, by providing a leak-proof structure 300 at both ends of the screen bar assembly 200, can prevent some molten slag particles from leaking from the asymmetrical ends of the screen bar assembly 200, thus improving the screening rate. Furthermore, the screen plate frame structure 100 can stably support the screen bar assembly 200 under vibration conditions, enhancing its stability under thermal vibration conditions, avoiding cracking and failure of the screen bar assembly 200 caused by thermal deformation or mechanical vibration, and significantly extending its service life.

[0047] The graded material distribution screen plate 10 of this invention achieves non-linear and efficient grading and improves service life, thereby better meeting the technical requirements of efficient, stable and economical recovery of molten steel slag. It is particularly suitable for extreme and harsh working conditions such as waste heat recovery of molten steel slag, and meets the technical requirements of efficient, stable and economical recovery.

[0048] In an embodiment of the present invention, the screen bar assembly 200 includes a plurality of screen bars 220 detachably disposed on the screen plate frame structure 100. The feed ends of the plurality of screen bars 220 are arranged radially around a preset arc, and a non-linear screen hole 210 is formed between adjacent screen bars 220.

[0049] By detachably installing multiple screen bars 220 onto the screen plate frame 110 and arranging them radially, nonlinear screen holes 210 with gradually increasing apertures can be formed between adjacent screen bars 220. The nonlinear screen holes 210 enable efficient stepwise screening of materials with wide particle size distribution, avoiding local blockage and screening blind spots. Furthermore, the radial layout optimizes the uniformity of material distribution and movement trajectory on the screen surface, enhances the centrifugal diffusion effect, and improves screening efficiency.

[0050] Furthermore, the detachable connection allows for quick replacement of individual screen bars 220 when they wear or are damaged, without the need for complete disassembly or scrapping of the entire screen plate assembly, significantly improving maintenance convenience and component versatility. Additionally, the use of screen bars 220 with equal diameters reduces machining difficulty, thereby lowering manufacturing costs.

[0051] Designers can adjust the specific structure, number, and angle of the screen bars 220 according to usage requirements, without specific limitations. In one feasible embodiment, the screen bars 220 are made of bar steel, and the number of screen bars 220 is not less than two.

[0052] In an embodiment of the present invention, the length of each screen bar 220 can be adjusted according to the overall size of the screen plate frame structure 100, thereby preventing the screen bars 220 from extending out of the screen plate frame structure 100.

[0053] In embodiments of the present invention, designers can adjust the specific shape and structure of each screen bar 220 according to usage needs, and no specific limitations are imposed here. In one feasible embodiment, the cross-section of the screen bar 220 is rectangular. In another feasible embodiment, the cross-section of the screen bar 220 is circular. In yet another feasible embodiment, the cross-section of the screen bar 220 is elliptical. Of course, the cross-section of the screen bar 220 can also be set to other shapes, and no specific limitations are imposed here. Furthermore, the material of the screen bar 220 can be a wear-resistant material, thereby increasing the service life of the screen bar 220.

[0054] In an embodiment of the present invention, the leak-proof structure 300 includes a first wear-resistant plate 310 and a second wear-resistant plate 320. The first wear-resistant plate 310 is disposed at the feed end of the screen frame structure 100 and connected to the feed end of the screen bar assembly 200. The top surface of the first wear-resistant plate 310 and the screen bar assembly 200 are disposed on the same plane. The second wear-resistant plate 320 is disposed at the discharge end of the screen frame structure 100 and connected to the discharge end of the screen bar assembly 200. The top surface of the second wear-resistant plate 320 and the screen bar assembly 200 are disposed on the same plane.

[0055] By setting a first wear-resistant plate 310 and a second wear-resistant plate 320 that are flush with the top surface of the screen bar assembly 200, the installation gaps formed by the layout of the radial screen bars 220 at the inlet and outlet ends are effectively sealed, preventing molten slag from leaking from the ends and ensuring the sealing performance and recycling efficiency of the graded material distribution screen plate 10.

[0056] Furthermore, the first wear-resistant plate 310, the second wear-resistant plate 320 and the top surface of the screen bar 220 are on the same plane, which avoids the blockage or jamming of materials during the material operation process, ensures smooth material sliding, reduces the risk of accumulation and wear, and significantly enhances the high temperature wear resistance of the key end area, thus extending the overall service life.

[0057] In an embodiment of the present invention, the first wear-resistant plate 310 includes a first arc-shaped side edge 311 connecting the feed end of each screen bar 220, the first arc-shaped side edge 311 forming a preset arc, and the second wear-resistant plate 320 includes a second arc-shaped side edge 321 connecting at least a portion of the discharge end of the screen bar 220.

[0058] Specifically, the first wear-resistant plate 310 is quadrilateral, with one side being a convex first arc-shaped side edge 311. The second wear-resistant plate 320 is quadrilateral, with one side being a concave second arc-shaped side edge 321.

[0059] By setting the feed end of the first wear-resistant plate 310 to have a first arc-shaped side edge 311 connecting the ends of each screen bar 220, the first arc-shaped side edge 311 itself forms a preset arc around which the screen bars 220 are arranged radially, a high degree of structural integration is achieved, ensuring the geometric accuracy and stability of the radial screen hole layout, and also fully fitting the ends of each screen bar 220, reducing material leakage problems. Similarly, the second arc-shaped side edge 321 can better fit the ends of some screen bars 220, improving the leakage prevention effect.

[0060] Of course, in other feasible embodiments, designers may adjust the specific shapes of the first wear-resistant plate 310 and the second wear-resistant plate 320 according to the needs of use, and no specific limitations are made here.

[0061] In an embodiment of the present invention, the screen frame structure 100 includes a frame 110 and a plurality of support beams 120 disposed on the frame 110. Along the direction from the feed end to the discharge end of the screen frame structure 100, the plurality of support beams 120 are arranged at intervals, and the support beams 120 are used to support each screen bar 220.

[0062] Multiple spaced support beams 120 provide multi-point support for the radial screen bar assembly 200, effectively enhancing the overall structure's load-bearing capacity and deformation resistance. Furthermore, by spaced-aparting support beams 120 on the frame 110, the support beams 120 and frame 110 form an integrated structure, providing better support and structural stability, thus improving the structural stability and fatigue life of the grading and feeding screen plate 10 under high-frequency vibration and high-temperature conditions.

[0063] Specifically, the support beam 120 is arc-shaped. By making the support beam 120 arc-shaped, it can be adapted to the radially arranged multiple screen bars 220, providing evenly spaced support and improving support stability.

[0064] In an embodiment of the present invention, the sieve plate frame structure 100 further includes a plurality of sieve bar supports 130 disposed on the sieve plate frame structure 100, and each sieve bar 220 is detachably connected to at least one sieve bar support 130.

[0065] By setting multiple screen bar supports 130 and detachably connecting each screen bar 220 to at least one screen bar support 130, rapid positioning, installation, and independent replacement of the screen bars 220 are achieved, significantly improving assembly efficiency and maintenance convenience. Simultaneously, the screen bar supports 130 enhance the connection rigidity at the root of the screen bars 220, effectively suppressing vibration loosening and stress fatigue, and improving the structural stability and long-term reliability of the screen bars 220 under high temperature and strong vibration conditions. Preferably, multiple screen bar supports 130 are correspondingly provided below each screen bar 220, and the synergistic effect of multiple screen bar supports 130 improves the installation stability of the screen bars 220.

[0066] Furthermore, the screen bar support 130 is provided with at least one support reinforcing rib. By providing support reinforcing ribs on the screen bar support 130, the structural strength and load-bearing capacity of the screen bar support 130 are significantly enhanced, and deformation and fatigue cracking under vibration conditions are effectively suppressed.

[0067] The application scope of the grading and feeding screen plate 10 includes, but is not limited to, steel slag, and other granular materials, such as, but not limited to, sintered ore and quicklime blocks, which can all be used for particle size grading and feeding using this invention.

[0068] Implementation Method 2

[0069] Please refer to the following: Figures 1 to 4 As shown, an embodiment of the present invention provides a thermal vibrating screen 20, which includes a grading and spreading screen plate 10 as described in Embodiment 1. The specific structure and beneficial effects of the grading and spreading screen plate 10 are the same as those described in Embodiment 1, and will not be described in detail here.

[0070] The thermal vibrating screen 20 achieves efficient grading and uniform distribution of materials under high temperature and strong vibration conditions by applying the grading and distribution screen plate 10, which significantly improves screening efficiency and equipment operation stability, while enhancing the wear resistance and structural reliability of the screen plate and extending the equipment maintenance cycle and service life.

[0071] The application scope of the thermal vibrating screen 20 includes, but is not limited to, steel slag, and other granular materials, such as, but not limited to, sintered ore and quicklime blocks, which can all be used for particle size classification and feeding using this invention.

[0072] Implementation Method 3

[0073] An embodiment of the present invention provides a grate-type heat extraction device, which includes a grate plate and a thermal vibrating screen 20 as described in Embodiment 2. The thermal vibrating screen 20 is disposed above the grate plate, and the conveying direction of the thermal vibrating screen 20 is the same as the movement direction of the grate plate.

[0074] By setting a thermal vibrating screen 20 as described in Embodiment 2 above the grate, and making the conveying direction of the thermal vibrating screen 20 consistent with the movement direction of the grate, dynamic grading and distribution of granulated steel slag on the grate is achieved.

[0075] Specifically, when steel slag passes through the grading and feeding screen 10 of the hot vibrating screen 20, smaller particles preferentially fall through the grading and feeding screen 10 and directly onto the surface of the grate. Subsequently, larger particles fall down one after another, forming an orderly layered structure of "small particles at the bottom and large particles at the top".

[0076] This material layer morphology significantly improves the air permeability and heat transfer uniformity of the steel slag bed. On the one hand, it facilitates the smooth penetration of cooling air into the material layer, improving heat exchange efficiency; on the other hand, it avoids the problem of fine particles blocking airflow channels or coarse particles accumulating, leading to uneven local cooling, thereby effectively improving the efficiency and stability of steel slag waste heat recovery.

[0077] Implementation Method 4

[0078] An embodiment of the present invention provides a slag material distribution method, which is implemented using the grate-type heat extraction device described in Embodiment 3. The slag material distribution method includes the following steps:

[0079] Step S1: Install the grading cloth screen plate 10 onto the thermal vibrating screen 20;

[0080] Step S2: Arrange the thermal vibrating screen 20 above the grate-type heat extraction device, and make the conveying direction of the thermal vibrating screen 20 the same as the movement direction of the grate plate;

[0081] Step S3: The granulated steel slag is conveyed to the hot vibrating screen 20. The steel slag is graded and distributed by the grading and distribution screen plate 10 so that the steel slag falls onto the grate plate of the grate heating device in order of particle size, forming a material layer with the particle size gradually decreasing from top to bottom.

[0082] Step S4: Allow the material on the hot vibrating screen 20 to fall to the top of the material layer to complete the particle size classification and material distribution.

[0083] The application scope of the slag material distribution method includes, but is not limited to, steel slag. Other granular materials, such as, but not limited to, sintered ore and quicklime blocks, can also be classified and distributed using this invention.

[0084] Specifically, the grading and feeding screen plate 10 is installed on the thermal vibrating screen 20, with the dense side of the screen bar assembly 200 located at the feed end and the sparse side located at the discharge end. The thermal vibrating screen 20 is arranged above the grate of the grate-type heat exchanger. The installation direction should ensure that the material movement direction in the thermal vibrating screen 20 is consistent with the movement direction of the grate of the grate-type heat exchanger, and the installation position should ensure that the centerline of the grading and feeding screen plate 10 of the thermal vibrating screen 20 is aligned with the centerline of the grate of the grate-type heat exchanger. After granulation, the steel slag enters the hot vibrating screen 20 and passes through the radially arranged screen bars 220. The radial arrangement of the screen bars 220 creates a gradual transition in the gaps between them, from small to large. The granulated steel slag then passes through the grading and distribution screen plate 10 of the hot vibrating screen 20. Smaller particles in the undersize material pass through first and land on the grate of the grate-type heat exchanger, while larger particles pass through last and land on the grate of the grate-type heat exchanger, forming a material layer with smaller particles at the bottom and larger particles at the top. The oversize material passes through last and lands on top of the material layer, completing the particle size grading and distribution.

[0085] The slag distribution method of this invention, through the application of the grate-type heat extraction device described in Embodiment 3, achieves efficient and orderly particle size classification and distribution of steel slag on the grate plate. During the vibration conveying process, the granulated steel slag falls stepwise according to particle size. Fine particles preferentially pass through the screen plate and fall onto the grate plate to form the bottom layer, followed by coarse particles. The final material layer with small particles at the bottom and large particles on top significantly improves the porosity and permeability of the material layer, which is conducive to the efficient penetration of cooling air from bottom to top, enhances the heat exchange effect, and avoids local airflow short-circuiting or blockage, thereby greatly improving the waste heat recovery efficiency of steel slag. This method is simple to operate, stable in operation, and suitable for continuous production under high temperature and strong vibration conditions, with good engineering applicability and energy-saving benefits.

[0086] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0087] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A grading screen for fabric, characterized in that, include: Sieve plate frame structure; A screen bar assembly is disposed on the screen plate frame structure. The screen bar assembly can form multiple non-linear screen holes, which are arranged radially. The diameter of the non-linear screen holes gradually increases along the direction from the feed end to the discharge end of the screen plate frame structure. A leak-proof structure is provided on the screen plate frame structure and placed at both ends of the screen bar assembly. The leak-proof structure is used to prevent material leakage.

2. The grading fabric screen plate as described in claim 1, characterized in that, The screen bar assembly includes multiple screen bars detachably mounted on the screen plate frame structure. The feed ends of the multiple screen bars are arranged radially around a preset arc, and a nonlinear screen hole is formed between adjacent screen bars.

3. The grading fabric screen plate as described in claim 2, characterized in that, The cross-section of the screen bar is rectangular, circular, or elliptical.

4. The grading fabric screen plate as described in claim 2, characterized in that, The leak-proof structure includes a first wear-resistant plate and a second wear-resistant plate. The first wear-resistant plate is disposed at the feed end of the screen plate frame structure and connected to the feed end of the screen bar assembly. The top surface of the first wear-resistant plate and the screen bar assembly are disposed on the same plane. The second wear-resistant plate is disposed at the discharge end of the screen plate frame structure and connected to the discharge end of the screen bar assembly. The top surface of the second wear-resistant plate and the screen bar assembly are disposed on the same plane.

5. The grading fabric sieve plate as described in claim 4, characterized in that, The first wear-resistant plate includes a first arc-shaped side edge connecting the feed end of each of the screen bars, the first arc-shaped side edge forming the preset arc, and the second wear-resistant plate includes a second arc-shaped side edge connecting at least a portion of the discharge end of the screen bars.

6. The grading fabric screen plate as described in claim 2, characterized in that, The screen frame structure includes a frame and multiple support beams disposed on the frame. The multiple support beams are arranged at intervals along the direction from the feed end to the discharge end of the screen frame structure, and the support beams are used to support each screen bar.

7. The grading fabric sieve plate as described in claim 6, characterized in that, The support beam is arranged in an arc shape.

8. The grading fabric screen plate as described in claim 6, characterized in that, The sieve plate frame structure also includes a plurality of sieve bar supports disposed on the sieve plate frame structure, and each sieve bar is detachably connected to at least one sieve bar support.

9. The grading fabric screen plate as described in claim 8, characterized in that, The screen bar support is provided with at least one support reinforcing rib.

10. A thermal vibrating screen, characterized in that, Includes the grading fabric screen plate as described in any one of claims 1 to 9.

11. A grate-type heat extraction device, characterized in that, It includes a grate plate and a thermal vibrating screen as described in claim 10, wherein the thermal vibrating screen is disposed above the grate plate and the conveying direction of the thermal vibrating screen is the same as the movement direction of the grate plate.

12. A method for distributing slag material, characterized in that, The slag distribution method, implemented using the grate-type heat extraction device as described in claim 11, includes the following steps: Install the grading and fabric sieve plate onto the thermal vibrating screen; The thermal vibrating screen is arranged above the grate-type heat extraction device, and the conveying direction of the thermal vibrating screen is the same as the movement direction of the grate plate. The granulated steel slag is conveyed to the thermal vibrating screen, and the steel slag is graded and distributed by the grading and distributing screen plate so that the steel slag falls onto the grate plate of the grate-type heat exchange device in order of particle size, forming a material layer with the particle size gradually decreasing from top to bottom. The material on the screen of the thermal vibrating screen falls to the top of the material layer, completing the particle size classification and material distribution.

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