A high-fineness calcined clay production grinding and sorting system, method and vertical grinding and sorting device

Abstract

The application provides a grinding and sorting system, a method and a vertical grinding and sorting device for producing high-fineness calcined clay, and relates to the technical field of calcined clay processing. The grinding and sorting system comprises a front conveying mechanism, a vertical grinding and sorting device, a grinding cylinder with a return port and a feeding port arranged at the top, and a sorting cylinder separated from the grinding cylinder by a grate. The sorting cylinder comprises a material falling chamber and a powder sorting chamber. The sidewall of the material falling chamber is provided with a first air inlet. The powder sorting chamber comprises a powder sorting rotor and a shell. The shell is connected to the air inlet chamber. An annular separation zone is left between the powder sorting rotor and the shell. The annular separation zone is connected downward to a dust hopper provided with a coarse material outlet. The inner cavity of the powder sorting rotor is connected downward to an air outlet pipe provided with a fine material outlet. The system further comprises a return elevator, a rear conveying mechanism and a finished product warehouse. The grinding and sorting system is simple, convenient and low in cost. The system is suitable for high-fineness and high-precision grinding, and reduces energy consumption.

Description

Technical Field

[0001] This invention relates to calcined clay processing technology, and more particularly to a grinding and sorting system, method, and vertical grinding and sorting device for producing fine calcined clay. Background Technology

[0002] In recent years, grinding mills and air classifiers have been widely used in the material grinding and sorting processes of industries such as cement. However, the two machines are set up independently, occupy a large space, and the material needs to be ground and sorted multiple times to separate the product with the ideal particle size. The process is complicated and increases the cost of purchase, use and maintenance.

[0003] Chinese patent CN113399058B discloses a high-efficiency vertical dry-process stirred mill and its application. The mill includes a shell, a screw feeder, a grinding cylinder, a main shaft, a stirrer, an activated liner, a discharge device, a drive device, a classifier, and an air supply device. Inside the shell, the classifier, screw feeder, grinding cylinder, discharge device, and drive device are installed sequentially from top to bottom. The coarse particle return pipe of the classifier and the discharge end of the screw feeder are both connected to the top of the grinding cylinder. The grinding cylinder contains a main shaft and a stirrer, with the stirrer fixed to the main shaft. An activated liner is installed on the inner wall of the grinding cylinder. The discharge device is located at the bottom of the grinding cylinder and fixed to the main shaft. The bottom of the main shaft is connected to the drive device. An annular air chamber is formed between the grinding cylinder and the shell. The air supply device is located below the discharge device and directly opposite the annular air chamber. The material in this patent needs to pass through an upward channel from below the grinding cylinder to enter the classifier, and then be sorted out by the classifier to obtain the material that meets the requirements. The path between the classifier and the grinding cylinder is not smooth, which means that the material needs to overcome its own gravity to be lifted, thus increasing energy consumption.

[0004] Therefore, there is a need for a grinding and sorting system, method, and vertical grinding and sorting device for the production of fine calcined clay, in order to at least partially solve the above-mentioned technical problems. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a grinding and sorting system, method and vertical grinding and sorting device for the production of fine calcined clay, so as to at least solve one of the problems in the prior art.

[0006] This invention discloses a grinding and sorting system for the production of fine calcined clay, comprising: The front conveying mechanism is used to transport calcined clay. A vertical grinding and sorting device includes a grinding cylinder with a return port and a feed port connected to the front conveying mechanism at a distance from the top, and a sorting cylinder separated from the grinding cylinder by a grate. The sorting cylinder includes a discharge chamber located below the grate and a classifying chamber located below the discharge chamber. The side wall of the discharge chamber is provided with a first air inlet for introducing a first gas, so that part of the first gas passes through the grate into the grinding cylinder and another part enters the classifying chamber. The classifying chamber includes a rotatable classifying rotor and a surrounding structure. The air guide vanes of the powder classifier rotor are housed in a housing that connects to an air inlet chamber for introducing a second gas. An annular separation zone is provided between the powder classifier rotor and the housing. The annular separation zone connects downward to a hopper with a coarse material outlet, so that coarse clay material falls from the hopper to the coarse material outlet through the annular separation zone. The inner cavity of the powder classifier rotor connects downward to an air outlet pipe with a fine material outlet, so that fine clay material is carried out from the air outlet pipe to the fine material outlet along with the first gas and the second gas through the powder classifier rotor. A return material elevator, one end of which is connected to the coarse material outlet and the other end of which is connected to the return material inlet; A rear conveying mechanism connected to the fine material outlet is used to convey the clay fine material; The finished product warehouse is used to store the clay fines.

[0007] In some embodiments of the present invention, the grinding cylinder includes: A first vertical shaft, the upper end of which is connected to a first transmission system for driving the first vertical shaft to rotate; The stirring blades are arranged on the first vertical shaft. The stirring blades are spiral-shaped and extend from the bottom to the top of the grinding cylinder to drive the clay upward. The grinding media is used in conjunction with the stirring blades to grind clay. The sorting cylinder includes: A turntable, rotatably disposed above the powder separator rotor, to disperse and sprinkle the material into the annular separation zone; A second vertical shaft is disposed in the inner cavity of the powder-selecting rotor. The upper end of the second vertical shaft is connected to the turntable and the powder-selecting rotor, and the lower end of the second vertical shaft is connected to a second transmission system for driving the powder-selecting rotor and the turntable to rotate.

[0008] In some embodiments of the present invention, a cooling sleeve is provided around the outer side wall of the grinding cylinder, and an air inlet for injecting a first gas is provided at the top of the cooling sleeve so that the first gas cools the grinding cylinder as a cooling gas when it flows through the cooling sleeve.

[0009] In some embodiments of the present invention, the air inlet chamber is volute-shaped and horizontally surrounds the periphery of the housing.

[0010] In some embodiments of the present invention, the stirring blades are provided with blade liners.

[0011] In some embodiments of the present invention, the blade liner includes a corrugated liner and a stepped liner, wherein the corrugated liner is located below the position of the stirring blade.

[0012] In some embodiments of the present invention, a cylinder liner is provided on the inner side wall of the grinding cylinder.

[0013] In some embodiments of the present invention, the cylinder liner includes an upper liner and a lower liner located below the upper liner, wherein the thickness of the upper liner is constant, and the lower liner gradually thickens from top to bottom, for guiding the clay downward to the bottom of the grinding cylinder and then towards the center.

[0014] Secondly, the present invention also discloses a vertical grinding and sorting device, the vertical grinding and sorting device comprising: A grinding cylinder with a return port and a feed port spaced apart at the top; A sorting cylinder is separated from the grinding cylinder by a grate plate. The sorting cylinder includes a material discharge chamber located below the grate plate and a powder classification chamber located below the material discharge chamber. The side wall of the material discharge chamber is provided with a first air inlet for introducing the first gas, so that a portion of the first gas passes through the grate and enters the grinding cylinder, while another portion enters the powder classifier chamber; The classifying chamber includes a rotatable classifying rotor and a housing with guide vanes surrounding the classifying rotor. The housing is connected to an air inlet chamber for introducing a second gas. An annular separation zone is provided between the classifying rotor and the housing. The annular separation zone is connected downward to an ash hopper with a coarse material outlet, so that clay coarse material falls from the ash hopper to the coarse material outlet through the annular separation zone. The inner cavity of the classifying rotor is connected downward to an air outlet pipe with a fine material outlet, so that clay fine material is carried out from the air outlet pipe to the fine material outlet along with the first gas and the second gas through the classifying rotor.

[0015] Thirdly, the present invention also discloses a grinding and sorting method for producing fine calcined clay using a grinding and sorting system, comprising the following steps: S1: The calcined clay is obtained through the front conveying mechanism and transported to the feed port of the vertical grinding and sorting device; S2: The calcined clay is ground by the grinding cylinder, and the ground calcined clay falls into the sorting cylinder through the grate. S3: The calcined clay that has been ground and fallen into the sorting cylinder in step S2 is sorted, and clay coarse material and clay fine material are obtained through the coarse material outlet and the fine material outlet respectively. S4: The clay coarse material is transported to the return port by the return material elevator and enters the grinding cylinder so that the clay coarse material is re-ground. S5: The clay fines are conveyed to the finished product warehouse and stored via the rear conveying mechanism.

[0016] The beneficial effects that can be obtained by utilizing the technical solution according to the embodiments of the present invention are at least as follows: 1. The grinding and sorting system for producing fine calcined clay requires less equipment and has a simple process flow, which facilitates process layout and maintenance and reduces investment costs.

[0017] 2. The vertical grinding and sorting device of this high-fineness calcined clay production grinding and sorting system has a compact structure. The sorting cylinder is set below the grinding cylinder, so that the ground material can enter the sorting cylinder by gravity, which reduces energy consumption.

[0018] 3. The vertical grinding and sorting device of this high-fineness calcined clay production grinding and sorting system has a first air inlet in the material discharge chamber of the sorting cylinder, which allows the first gas to enter the grinding cylinder and the sorting cylinder. While promoting the flow of material from the grinding cylinder to the sorting cylinder, the first gas entering the grinding cylinder promotes the fluidization of the material in the grinding cylinder, which is beneficial to the high-precision grinding of the material. After entering the sorting cylinder, the first gas drives the clay fines to achieve material separation and collection.

[0019] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the description, or may be learned by practice of the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures specifically pointed out in the description and drawings.

[0020] Those skilled in the art will understand that the objectives and advantages achievable with the present invention are not limited to those specifically described above, and that the above and other objectives achievable with the present invention will become clearer from the following detailed description. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. The components in the drawings are not drawn to scale but are merely illustrative of the principles of the invention. For ease of illustration and description of certain parts of the invention, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to the invention. In the drawings: Figure 1 This is an overall schematic diagram of a grinding and sorting system for producing fine calcined clay according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a vertical grinding and sorting device in a grinding and sorting system for producing fine calcined clay according to another embodiment of the present invention. Figure 3 This is a schematic diagram of a grinding cylinder in a grinding and sorting system for producing fine calcined clay according to another embodiment of the present invention; Figure 4 This is a schematic diagram of a sorting cylinder in a grinding and sorting system for producing fine calcined clay according to another embodiment of the present invention; Figure 5 A top view of the classifying chamber in a grinding and sorting system for producing fine calcined clay according to another embodiment of the present invention; and Figure 6 This is a schematic diagram showing the distribution of blade liners in a grinding and sorting system for producing fine calcined clay according to another embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: Front conveying mechanism 1; Vertical grinding and sorting device 2; Grinding cylinder 21; Sorting cylinder 22; Grate 23; Return port 211; Feed port 212; First vertical shaft 213; First transmission system 214; Stirring blades 215; Grinding body 216; Cooling sleeve 217; Corrugated liner 2181; Stepped liner 2182; Upper liner 2191; Lower liner 2192; Drop chamber 221; Classifying chamber 222; First air inlet 2211; Classifying rotor 2221; Shell 2222; Air inlet chamber 2223; Annular separation zone 2224; Ash hopper 223; Coarse material outlet 2231; Air outlet pipe 224; Fine material outlet 2241; Turntable 225; Second vertical shaft 226; Second transmission system 227; Return material elevator 3; Rear conveying mechanism 4; Finished product warehouse 5. Detailed Implementation

[0023] The objects and functions of the present invention, as well as the methods for achieving these objects and functions, will be clarified by referring to exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The purpose of this specification is merely to help those skilled in the art to comprehensively understand the specific details of the invention.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0025] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0026] It should be noted that the terms “upper,” “lower,” “front,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be limiting.

[0027] This invention provides a grinding and sorting system for producing fine calcined clay, which may include a front conveying mechanism 1, a vertical grinding and sorting device 2, a return material elevator 3, a rear conveying mechanism 4, and a finished product warehouse 5.

[0028] Specifically, the front conveying mechanism 1 is used to convey the calcined clay.

[0029] The vertical grinding and sorting device 2 includes a grinding cylinder 21 for grinding, which is provided with a return port 211 and a feed port 212 connected to the front conveying mechanism 1 at a distance from the top, and a sorting cylinder 22 which is separated from the grinding cylinder 21 by a grate 23.

[0030] The sorting cylinder 22 includes a material discharge chamber 221 located below the grate 23 and a powder classifying chamber 222 located below the material discharge chamber 221. The side wall of the material discharge chamber 221 is provided with a first air inlet 2211 for introducing a first gas.

[0031] Among them, part of the first gas entering the material discharge chamber 221 passes upward through the grate plate 23 and enters the grinding cylinder 21, while the other part enters the powder classifier chamber 222 downward.

[0032] The classifying chamber 222 includes a rotatable classifying rotor 2221 and a housing 2222 surrounding the classifying rotor 2221 with guide vanes. The housing 2222 is connected to an air inlet chamber 2223 for introducing a second gas. An annular separation zone 2224 is provided between the classifying rotor 2221 and the housing 2222. The annular separation zone 2224 is connected downward to a hopper 223 with a coarse material outlet 2231, so that coarse clay material falls from the hopper 223 to the coarse material outlet 2231 through the grate 23 and the annular separation zone 2224. The inner cavity of the classifying rotor 2221 is connected downward to an air outlet 224 with a fine material outlet 2241, so that fine clay material is carried out from the air outlet 224 to the fine material outlet 2241 along with the first and second gases through the grate 23 and the annular separation zone 2224.

[0033] The return material elevator 3 is connected at one end to the coarse material outlet 2231 and at the other end to the return material inlet 211.

[0034] The rear conveying mechanism 4, connected to the fine material outlet 2241, is used to convey clay fines.

[0035] Finished product warehouse 5 is used to store fine clay materials.

[0036] Please refer to the schematic diagrams for the grinding and sorting system and vertical grinding and sorting device used in the production of fine calcined clay. Figure 1 and Figure 2 It is understood that the material used in this embodiment is calcined clay, which is only used as a specific example for illustration. Of course, it can also be other materials to be ground and sorted.

[0037] The front conveying mechanism 1 is used to transport the calcined clay to the vertical grinding and sorting device 2. It may include one or more devices, and the specific functions of the devices are not limited, as long as the whole can achieve the purpose of conveying. For example, the front conveying mechanism 1 may include a stabilizing silo for storing the calcined clay, an elevator for lifting the calcined clay, and a screw conveyor for stably and continuously transporting the calcined clay, which is not limited here.

[0038] The grinding cylinder 21 is a structure used for grinding. The specific grinding method can be a vertical stirred mill or a ball mill. For example, as a vertical stirred mill structure, stirring blades can be provided. For example, the stirring blades can be composed of multiple flat blades or spiral blades.

[0039] The grate 23 is a structure used to separate the grinding cylinder 21 and the sorting cylinder 22, and can be fixedly connected between them. The grate 23 serves two purposes: firstly, it prevents clay that does not meet the particle size requirements from falling; secondly, it can have multiple through holes to allow ground clay of a certain particle size to pass through. For example, the diameter of the through holes can be 2 mm. Furthermore, the grate 23 allows the first gas to enter the grinding cylinder 21 from bottom to top, thereby reducing the possibility of unground clay clogging the grate 23, and allowing the first gas to mix with the material in the grinding cylinder 21 and drive the material's movement. When the clay falls through the grate 23, the first gas can also push the clay into the annular separation zone 2224 within the classifying chamber 222.

[0040] Due to the needs of the actual process, the sieve hole diameter provided by the grate plate 23 may not be able to meet the requirements of the fineness of clay grinding, or it may be difficult to adapt to the fineness requirements of clay due to changes in conditions. Therefore, the sorting cylinder 22 needs to separate out the clay coarse material that does not meet the requirements while separating out the clay fine material that meets the requirements, so that the clay coarse material can be returned to the grinding cylinder 21 for re-grinding.

[0041] For a top view of the structure of the powder classifier 222, please refer to... Figure 5 The structure of the classifying rotor 2221 can be a single cage rotor or a double cage rotor with an upper and lower structure. The classifying rotor 2221 can be equipped with multiple moving blades or blades at different angles at different positions on the classifying rotor 2221 to ensure stable passage of gas and clay fines. The rotational power of the classifying rotor 2221 can be synchronously driven by a power system shared with the grinding cylinder 21, or it can be driven by a separate power system.

[0042] The housing 2222 is a horizontally surrounding annular structure of the classifying rotor. Multiple guide vanes are installed on the housing 2222. These vanes allow air to pass through, enabling the airflow to separate fine clay particles, while simultaneously blocking clay from passing through, ensuring stable machine operation. The guide vanes on the housing 2222 can be stationary vanes, such as those arranged in parallel and evenly spaced arrays, or they can be moving vanes, such as those arranged in a spiral rotation configuration, to achieve the airflow guiding function.

[0043] The air inlet chamber 2223 is for introducing a second gas, which is mainly used to separate coarse clay and fine clay. The second gas enters the shell 2222 from the air inlet chamber 2223, thus achieving a stable gas flow.

[0044] With the introduction of the first and second gases, as the classifying rotor 2221 rotates, the fine clay material enters the inner cavity of the classifying rotor 2221 along with the gas and enters the air outlet 224, thereby reaching the fine material outlet 2241 and being discharged; while the coarse clay material cannot be driven by the gas, so it falls down along the inner wall of the ash hopper 223 to the coarse material outlet 2231, and then returns to the upper return port 211 by the lifting action of the return material elevator 3, and enters the grinding cylinder for re-grinding.

[0045] The rear conveying mechanism 4 is used to convey the clay fines separated by the vertical grinding and sorting device 2. It may also include one or more devices, specifically, it may include dust collectors, elevators and other equipment with various functions, which are not limited here.

[0046] This configuration, where the grinding cylinder 21 and the sorting cylinder 22 in the vertical grinding and classifying device 2 are integrated, simplifies and facilitates the processing of calcined clay, reducing maintenance and manufacturing costs. The first gas introduced into the discharge chamber 221 not only promotes the movement of materials within the grinding cylinder 21 and reduces the possibility of material accumulation and blockage on the grate 23, but also facilitates the separation of fine clay particles in the classifying chamber 222 by driving the material downwards. This results in an additional improvement in grinding and classifying efficiency compared to the simple combination of the grinding cylinder 21 and the sorting cylinder 22. The coarse clay material discharged from the coarse material outlet 2231 is lifted to the return inlet 211 by the return elevator 3 and re-enters the grinding cylinder 21 for grinding, ensuring full utilization of the material.

[0047] In some embodiments of the present invention, a grinding and sorting system for producing fine calcined clay may be provided, wherein the grinding cylinder 21 may include a first vertical shaft 213 and a stirring blade 215.

[0048] A first vertical shaft 213, the upper end of which is connected to a first transmission system 214 for driving the first vertical shaft 213 to rotate.

[0049] The stirring blades 215 are set to the first vertical shaft 213. The stirring blades 215 are spiral-shaped and extend from the bottom to the top inside the grinding cylinder 21 to drive the clay upward.

[0050] Grinding body 216 is used in conjunction with stirring blade 215 to grind clay.

[0051] In some embodiments of the present invention, the grinding and sorting system for producing fine calcined clay may include a sorting cylinder 22, which may include a turntable 225 and a second vertical shaft 226.

[0052] A turntable 225 is rotatably disposed above the powder separator rotor 2221 to disperse and sprinkle the material into the annular separation zone 2224.

[0053] The second vertical shaft 226 is disposed in the inner cavity of the powder classifier rotor 2221. The upper end of the second vertical shaft 226 is connected to the turntable 225 and the powder classifier rotor 2221, and the lower end of the second vertical shaft 226 is connected to the second transmission system 227 for driving the powder classifier rotor 2221 and the turntable 225 to rotate.

[0054] For structural diagrams of the grinding cylinder 21 and the sorting cylinder 22, please refer to... Figure 3 and Figure 4 It can be understood that the helical structure of the stirring blade 215 on the first vertical shaft 213 can be either a double helix or a single helix. In this embodiment, the grinding media 216 is an object used for grinding and can be a spherical structure with high density, such as a steel ball. The grinding cylinder 21 adopts a structure similar to a vertical spiral stirred mill. The high-speed rotating spiral stirring blades 215 lift and push the material and grinding media 216 along the stirring blades 215 to the upper part of the cylinder. Then, the material falls from the space between the stirring blades 215 and the cylinder wall at the upper part of the cylinder. Material meeting a certain particle size fineness can enter the sorting cylinder 22 through the grate 23 below. Material that is not sufficiently ground will be brought back to the stirring blades 215 for repeated grinding. For example, a distance of 2.5-3 times the diameter of the grinding media 216 can be left between the stirring blades 215 and the cylinder wall to facilitate the fall of the material that has been lifted to the top after grinding. The sorting cylinder 22 in this embodiment also includes a rotatable turntable 225, which allows the material to be thrown off the turntable 225 after falling and thus dispersed. The material then enters the annular separation zone 2224 with a horizontally outward initial velocity but no vertical initial velocity, which is more conducive to the separation of coarse and fine clay particles. The grinding cylinder 21 and the sorting cylinder 22 use independent power systems to control the fineness of grinding and sorting respectively, making the process control simpler when the required particle size of the material changes.

[0055] In some embodiments, the grinding and sorting system for producing fine calcined clay may further include a cooling sleeve 217 disposed around the outer sidewall of the grinding cylinder 21. The top of the cooling sleeve 217 is provided with an inlet for introducing a first gas, so that the first gas flows through the cooling sleeve 217 as a cooling gas to cool the grinding cylinder 21.

[0056] It is understood that the grinding cylinder 21 will generate additional heat during the grinding process. In order to reduce the temperature of the grinding cylinder 21, a cooling sleeve 217 can be set to surround the outside of the side wall. For example, the cooling sleeve 217 can be connected to the first air inlet 2211 of the discharge chamber 221 after the temperature of the cylinder wall is reduced on the outside, the first gas is introduced into the discharge chamber 221 from the first air inlet 2211 and passes upward through the grate plate 23, which can also play a role in reducing the temperature.

[0057] In some embodiments, the air inlet chamber 2223 may be volute-shaped and horizontally surround the periphery of the housing 2222.

[0058] It is understandable that the air inlet chamber 2223 is designed in a volute shape, which can achieve stable and uniform blowing of the second gas from the fan spiral along the air duct with only one fan and a relatively simple air duct. Furthermore, the airflow resistance is reduced by the air guide vanes on the housing 2222, and the uniform air intake from multiple directions also makes the material more dispersed.

[0059] In some embodiments, the stirring blade 215 may be provided with a blade liner.

[0060] It is understandable that the blade liner can be made of wear-resistant material, and the fixing method for the mixing blade 215 can be bolts or dovetail grooves, etc., to fix it to the surface of the mixing blade 215. For easy replacement, multiple blade liners can also be spliced ​​together. By setting the blade liner, the contact between the mixing blade 215 and the material is reduced, thereby reducing the wear of the mixing blade 215 and reducing maintenance costs.

[0061] The blade liner can be designed in various shapes to cooperate with the grinding media 216 to achieve fine grinding of materials. For example, the blade liner includes a corrugated liner 2181 and a stepped liner 2182, with the corrugated liner 2181 located below the stirring blade 215 at the position of the stepped liner 2182.

[0062] It can be understood that "below" refers to the location below the stepped liner 2182, which has a trapezoidal surface, when viewed from top to bottom or bottom to top along the spiral surface of the stirring blade 215. Based on the movement of clay in the stirred mill, the material below spirals upwards along the stirring blade 215, resulting in greater pressure from mutual compression and finer particles; while the material and steel balls above are less numerous, leading to less pressure from mutual compression and coarser particles. Comparatively, the stepped liner 2182 is better at absorbing the impact of the falling grinding media 216, while the corrugated liner 2181 is better suited to work with the grinding media 216, reducing material retention. Therefore, to accommodate materials of different fineness contacting the blade liner, the structure of the stepped liner 2182 can be designed to improve the crushing efficiency of larger particles by utilizing the interaction between the blade liner and the grinding media. Alternatively, the structure of the corrugated liner can be designed to ensure the fineness of the ground small particles. Specifically, the boundary between the corrugated liner 2181 and the stepped liner 2182 is determined by the actual needs of the work. For example, such as... Figure 6For a stirring blade 215 with three pitch heights, a stepped liner 2182 can be provided on the stirring blade 215 with one pitch height above the stirring blade, and a corrugated liner 2181 can be provided below and spliced ​​with the stepped liner 2182. In other words, the length of the first vertical shaft 213 corresponding to the stirring blade 215 with the corrugated liner 2181 can be twice the length of the first vertical shaft 213 corresponding to the stirring blade 215 with the stepped liner 2182.

[0063] In some embodiments, a cylinder liner may also be provided on the inner side wall of the grinding cylinder 21.

[0064] It is understandable that the cylinder liner can protect the inner side wall of the grinding cylinder 21 and reduce the degree of wear on the inner side wall of the grinding cylinder 21 by the grinding body 216 and the material.

[0065] The cylinder liner can also take various shapes to cooperate with grinding, such as corrugated liner, smooth liner, and convex rib liner. The specific setting method and setting position are based on improving the grinding effect and reducing impact damage.

[0066] The cylinder liner may include an upper liner 2191 and a lower liner 2192 located below the upper liner 2191. The upper liner 2191 has a constant thickness, while the lower liner 2192 gradually becomes thicker from top to bottom, which is used to guide the clay to fall downward to the bottom of the grinding cylinder 21 and then move towards the center.

[0067] It is understandable that, in order to avoid material accumulation on the side wall of the grinding cylinder 21 and the corner of the grate plate 23, the thickness of the cylinder liner can be gradually changed from top to bottom to form a certain slope so that the material moves toward the center of the cylinder, making it easier for the material to be repeatedly lifted and ground by the stirring blades 215.

[0068] This invention also discloses a vertical grinding and sorting device 2. The vertical grinding and sorting device 2 may include a grinding cylinder 21 for grinding, which is provided with a return port 211 and a feed port 212 at the top, and a sorting cylinder 22 that is separated from the grinding cylinder 21 by a grate 23.

[0069] Specifically, the sorting cylinder 22 may include a material discharge chamber 221 disposed below the grate 23 and a powder classifying chamber 222 disposed below the material discharge chamber 221.

[0070] The side wall of the material discharge chamber 221 is provided with a first air inlet 2211 for introducing the first gas. Part of the first gas entering the material discharge chamber 221 passes upward through the grate 23 and enters the grinding cylinder 21, while the other part enters the powder classifier 222 downward.

[0071] The classifying chamber 222 includes a rotatable classifying rotor 2221 and a housing 2222 surrounding the classifying rotor 2221 with guide vanes. The housing 2222 is connected to an air inlet chamber 2223 for introducing a second gas. An annular separation zone 2224 is provided between the classifying rotor 2221 and the housing 2222. The annular separation zone 2224 is connected downward to a hopper 223 with a coarse material outlet 2231, so that coarse clay material falls from the hopper 223 to the coarse material outlet 2231 through the grate 23 and the annular separation zone 2224. The inner cavity of the classifying rotor 2221 is connected downward to an air outlet 224 with a fine material outlet 2241, so that fine clay material is carried out from the air outlet 224 to the fine material outlet 2241 along with the first and second gases through the grate 23 and the annular separation zone 2224.

[0072] It is understood that the vertical grinding and sorting device 2 is the core device for realizing the above-mentioned grinding and sorting system for producing fine calcined clay. In actual use, the vertical grinding and sorting device 2 can be used as a standalone device in other processes to play the role of sorting and grinding, or it can be used in combination with one or more other vertical grinding devices 2 in this process to improve grinding efficiency and / or improve classification effect, so as to maximize its role.

[0073] This invention also discloses a method for processing calcined clay using a grinding and sorting system for producing fine calcined clay, which may include the following steps: S1: The calcined clay is obtained through the front conveying mechanism 1 and transported to the feed inlet 212 of the vertical grinding and sorting device 2.

[0074] S2: The calcined clay is ground by the grinding cylinder 21, and the ground calcined clay falls into the sorting cylinder 22 through the grate 23.

[0075] S3: The calcined clay that has been ground and fallen into the sorting cylinder 22 after step S2 is sorted, and clay coarse material and clay fine material are obtained through coarse material outlet 2231 and fine material outlet 2241 respectively.

[0076] S4: The clay coarse material is transported to the return port 211 by the return material elevator 3 and enters the grinding cylinder 21 so that the clay coarse material can be re-ground.

[0077] S5: The clay fines are conveyed to the finished product warehouse 5 and stored via the rear conveyor mechanism 4.

[0078] It is understood that the method uses the fine calcined clay production grinding and sorting system described in the above embodiment, and uses calcined clay as a specific implementation method. Similarly, this method can also be used to grind and sort other materials, and is not limited here.

[0079] Other embodiments of the invention will be readily conceived and understood by those skilled in the art in conjunction with the description and practice of the invention disclosed herein. The description and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are defined by the claims.

Claims

1. A grinding and sorting system for producing fine calcined clay, characterized in that, include: The front conveying mechanism is used to transport calcined clay. Vertical grinding and sorting device, including: A grinding cylinder with a return port and an inlet connected to the front conveying mechanism is provided at the top; A sorting cylinder, separated from the grinding cylinder by a grate plate; The sorting cylinder includes a material discharge chamber located below the grate and a powder sorting chamber located below the material discharge chamber. The side wall of the material discharge chamber is provided with a first air inlet for introducing a first gas. The powder classifier chamber includes a rotatable powder classifier rotor and a housing with guide vanes surrounding the powder classifier rotor. The housing is connected to an air inlet chamber for introducing a second gas. An annular separation zone is provided between the powder classifier rotor and the housing. The annular separation zone is connected downward to an ash hopper with a coarse material outlet. The inner cavity of the powder classifier rotor is connected downward to an air outlet pipe with a fine material outlet. A return material elevator, one end of which is connected to the coarse material outlet and the other end of which is connected to the return material inlet; A rear conveying mechanism connected to the fine material outlet is used to convey clay fines; A finished product warehouse is used to store the clay fines; The grinding cylinder includes: A first vertical shaft, the upper end of which is connected to a first transmission system for driving the first vertical shaft to rotate; The stirring blades are arranged on the first vertical shaft. The stirring blades are spiral-shaped and extend from the bottom to the top of the grinding cylinder to drive the clay upward. The grinding media is used in conjunction with the stirring blades to grind clay. The sorting cylinder includes: A turntable, rotatably disposed above the powder separator rotor, to disperse and sprinkle the material into the annular separation zone; The second vertical shaft is disposed in the inner cavity of the powder classifier rotor. The upper end of the second vertical shaft is connected to the turntable and the powder classifier rotor, and the lower end of the second vertical shaft is connected to a second transmission system for driving the powder classifier rotor and the turntable to rotate. A cooling sleeve is provided around the outer side wall of the grinding cylinder, and an air inlet for injecting a first gas is provided at the top of the cooling sleeve so that the first gas can be used as a cooling gas to cool the grinding cylinder when it flows through the cooling sleeve. The stirring blade is provided with a blade liner; the blade liner includes a corrugated liner and a stepped liner, and the corrugated liner is located below the stepped liner at the position of the stirring blade.

2. The grinding and sorting system for producing fine calcined clay according to claim 1, characterized in that, The air inlet chamber is volute-shaped and horizontally surrounds the periphery of the housing.

3. The grinding and sorting system for producing fine calcined clay according to claim 1, characterized in that, The grinding cylinder has a cylinder liner plate on the inner side wall.

4. The grinding and sorting system for producing fine calcined clay according to claim 3, characterized in that, The cylinder liner includes an upper liner and a lower liner located below the upper liner. The upper liner has a constant thickness, while the lower liner gradually thickens from top to bottom to guide the clay downwards to the bottom of the grinding cylinder and then towards the center.

5. A vertical grinding and sorting device for a grinding and sorting system for producing fine calcined clay as described in any one of claims 1 to 4, characterized in that, include: A grinding cylinder with a return port and a feed port spaced apart at the top; A sorting cylinder is separated from the grinding cylinder by a grate plate. The sorting cylinder includes a material discharge chamber located below the grate plate and a powder classification chamber located below the material discharge chamber. The side wall of the material discharge chamber is provided with a first air inlet for introducing the first gas, so that a portion of the first gas passes through the grate and enters the grinding cylinder, while another portion enters the powder classifier chamber; The classifying chamber includes a rotatable classifying rotor and a housing with guide vanes surrounding the classifying rotor. The housing is connected to an air inlet chamber for introducing a second gas. An annular separation zone is provided between the classifying rotor and the housing. The annular separation zone is connected downward to an ash hopper with a coarse material outlet, so that clay coarse material falls from the ash hopper to the coarse material outlet through the annular separation zone. The inner cavity of the classifying rotor is connected downward to an air outlet pipe with a fine material outlet, so that clay fine material is carried out from the air outlet pipe to the fine material outlet along with the first gas and the second gas through the classifying rotor.

6. A method for grinding and separating fine calcined clay using the grinding and separating system for producing fine calcined clay according to any one of claims 1 to 4, characterized in that, Includes the following steps: The calcined clay is obtained through the front conveying mechanism and transported to the feed inlet of the vertical grinding and sorting device. The calcined clay is ground through the grinding cylinder, and the ground calcined clay falls into the sorting cylinder through the grate. The calcined clay that has been ground and falls into the sorting cylinder is sorted, and coarse clay and fine clay are obtained through the coarse material outlet and the fine material outlet, respectively. The obtained clay coarse material is transported to the return port by the return material elevator and then enters the grinding cylinder so that the clay coarse material can be re-ground. The obtained clay fines are transported to the finished product warehouse and stored via the rear conveying mechanism.

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