A dynamic powder sorting device for producing cement

Abstract

The utility model discloses a kind of dynamic powder selecting device for producing cement, including powder concentrator body, powder concentrator body includes shell, shell top is equipped with feed pipe, vertical setting is provided with rotating shaft in shell, shell top is provided with the drive mechanism for driving rotating shaft rotation;Rotating shaft is coaxially provided with and is fixedly connected with the inverted conical hopper of shell from top to bottom, and the bulk tray and the rotating cage that rotate with shaft;Annular plate is fixedly connected with shell and is arranged below hopper, the lower end of hopper passes through the middle part mounting hole of annular plate and extends to below rotating cage, rotating cage is sleeved in the outside of hopper and is located between annular plate and bulk tray;Shell lateral wall above annular plate is equipped with exhaust port;Shell lower end inner wall is equipped with airflow distributor, annular groove is arranged on airflow distributor upper surface, annular groove top is equipped with annular filter plate, bottom is connected with air inlet pipe, shell bottom is equipped with discharge pipe.The utility model structure is compact, and powder concentration precision is high, and efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of cement production equipment technology, and in particular to a dynamic powder classifier for cement production. Background Technology

[0002] Dynamic air classifiers are crucial core equipment in cement grinding systems, used to separate ground materials into coarse and fine powders. Traditional static air classifiers suffer from low sorting efficiency, poor accuracy, and an inability to flexibly adjust according to material characteristics. While existing dynamic air classifiers have improved sorting efficiency by introducing a rotating cage (also known as a cage rotor), they still suffer from uneven material dispersion upon material entry, with some coarse material being directly drawn away without sufficient sorting, affecting the quality of the sorted product. Furthermore, the uneven distribution of the rising airflow introduced from the bottom creates localized vortices or high-speed zones, resulting in a wider sorting particle size range and an unsatisfactory product particle size distribution. Utility Model Content

[0003] This invention provides a dynamic air classifier for cement production, which solves the problems of low product quality and low classification efficiency caused by uneven distribution of rising airflow in traditional air classifiers.

[0004] This utility model provides a dynamic air classifier for cement production, including an air classifier body. The air classifier body includes a shell, a feed pipe at the top of the shell, and a rotating shaft vertically arranged inside the shell. A drive mechanism for driving the rotating shaft to rotate is provided at the top of the shell. An inverted conical hopper fixedly connected to the shell and a material distribution plate and a rotating cage rotating with the shaft are coaxially arranged on the rotating shaft from top to bottom. An annular plate fixedly connected to the shell is provided below the hopper. The lower end of the hopper passes through the mounting hole in the middle of the annular plate and extends to the bottom of the rotating cage. The rotating cage is sleeved outside the hopper and located between the annular plate and the material distribution plate. An exhaust port is provided on the side wall of the shell above the annular plate. An airflow distributor is provided on the inner wall of the lower end of the shell. An annular groove is provided on the top of the airflow distributor. An annular filter plate is provided at the top of the annular groove and an air inlet pipe is connected to the bottom. A discharge pipe is provided at the bottom of the shell.

[0005] Furthermore, the drive mechanism includes a motor fixed to the top of the housing, the output shaft of the motor facing upward and connected to a drive pulley, the upper end of the rotating shaft connected to a driven pulley, and the drive pulley and the driven pulley connected by a transmission belt.

[0006] Furthermore, the rotating cage is fixedly connected to the bulk material tray via multiple support rods.

[0007] Furthermore, the middle part of the annular groove is divided by an annular partition plate, and the annular partition plate is provided with multiple air outlets at intervals along the circumference.

[0008] Furthermore, the feed tube extends obliquely into the interior of the housing.

[0009] Furthermore, a discharge valve is provided on the discharge pipe.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model allows materials to fall through an inclined feed pipe into a fixed inverted conical hopper, where they converge and fall vertically to the center of a high-speed rotating distribution plate. Under the action of strong centrifugal force, the materials are instantly scattered in all directions, achieving initial uniform dispersion and effectively preventing material accumulation and uneven dispersion.

[0011] 2. This utility model sends airflow from the air inlet pipe into the annular groove, which is then throttled and guided by the annular partition plate, and sprayed upward from multiple evenly distributed rectangular air outlets. After passing through the top annular filter plate for final flow equalization, a stable and uniform upward airflow field is formed in the powder sorting area. This ensures that the powder in every part of the material distribution plate is subjected to the same wind pressure and wind speed, which significantly improves the sorting accuracy and efficiency. Attached Figure Description

[0012] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of a dynamic powder classifier for cement production proposed in this utility model. Figure 2 This is a partial structural schematic diagram of a dynamic powder classifier for cement production proposed in this utility model. Figure 3 This utility model presents a schematic diagram illustrating the operating principle of a dynamic powder classifier for cement production, which includes both coarse and fine materials.

[0014] In the picture: 1. Air classifier body; 11. Shell; 12. Feed pipe; 13. Rotating shaft; 14. Exhaust port; 2. Drive mechanism; 21. Motor; 22. Driving pulley; 23. Driven pulley; 24. Transmission belt; 3. Feed hopper; 4. Material distribution plate; 5. Rotating cage; 51. Support rod; 6. Annular plate; 7. Airflow distributor; 71. Annular groove; 72. Annular filter plate; 73. Air inlet pipe; 74. Discharge pipe; 75. Annular partition plate; 76. Air outlet; 77. Discharge valve. Detailed Implementation

[0015] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0016] Example 1: See Figure 1-3 A dynamic powder classifier for cement production includes a classifier body 1, which includes a housing 11. A feed pipe 12 is provided at the top of the housing 11. A rotating shaft 13 is vertically arranged inside the housing 11. A drive mechanism 2 for driving the rotating shaft 13 to rotate is provided at the top of the housing 11. An inverted conical hopper 3, fixedly connected to the housing 11, a material distribution plate 4, and a rotating cage 5 are coaxially arranged on the rotating shaft 13 from top to bottom. An annular plate 6, fixedly connected to the housing 11, is provided below the hopper 3. The lower end of the hopper 3 passes through a mounting hole in the middle of the annular plate 6 and extends below the rotating cage 5. The rotating cage 5 is fitted around the hopper 3 and located between the annular plate 6 and the material distribution plate 4. A side wall of the housing 11 above the annular plate 6 is provided with… It has an exhaust port 14; the lower inner wall of the shell 11 is provided with an airflow distributor 7, the airflow distributor 7 is provided with an annular groove 71, the top of the annular groove 71 is provided with an annular filter plate 72, and the bottom is connected to an air inlet pipe 73. The bottom of the shell 11 is provided with a discharge pipe 74. The material falls into the fixed inverted cone-shaped discharge hopper through the inclined feed pipe, and after gathering, it falls vertically to the center of the high-speed rotating distribution plate. Under the action of strong centrifugal force, the material is instantly thrown to all sides, achieving preliminary uniform dispersion and effectively preventing material accumulation and uneven dispersion. The dispersed coarse and fine materials are air-separated by the air supplied upward by the bottom of the shell 11. The fine material moves upward under the action of the wind, and the heavy particles move downward and are discharged from the bottom of the shell 11, achieving efficient powder selection.

[0017] In this embodiment, see Figure 1 , 23. The top of the classifier body 1 is sealed by a cover. A feed pipe 12 is provided on one side of the cover and extends obliquely into the inside of the housing. A shaft seat is fixedly provided in the middle of the cover. A rotating shaft 13 is vertically provided inside the housing 11. The upper end of the rotating shaft 13 extends upward and passes through the cover and is rotatably connected to the bearing in the shaft seat. The drive mechanism 2 includes a motor 21 fixed to the top of the housing 11. The output shaft of the motor 21 faces upward and is connected to a drive pulley 22. The upper end of the rotating shaft 13 is connected to a driven pulley 23. The drive pulley 22 and the driven pulley 23 are connected by a transmission belt 24. A motor 21 is vertically mounted on the top of the housing 11. The speed of the motor 21 is controlled by a matching frequency converter. The output shaft of the motor 21 faces upwards. The motor mount of the motor 21 is fixedly connected to the housing 11. The output shaft of the motor 21 faces upwards and is coaxially fixedly connected to the drive pulley 22. The upper end of the rotating shaft 13 is coaxially fixed to the driven pulley 23. The driven pulley 23 is connected to the drive pulley 22 via a transmission belt 24. Inside the housing 11, the rotating shaft 13 is coaxially fitted with an inverted conical hopper 3, an annular plate 6, a rotating cage 5, and a material distribution plate 4 from top to bottom. The upper end of the hopper 3 is sealed and fixedly connected to the top of the shell 11. The annular plate 6 is provided with an installation hole in the middle. The annular plate 6 is sealed and fixedly connected to the inner wall of the shell 11 around its perimeter. The discharge pipe at the lower end of the discharge hopper 3 extends through the installation hole of the annular plate 6 to the bottom of the annular plate 6. The gap between the discharge pipe and the installation hole is used to allow the upward-flowing powder to pass through. The material distribution plate 4 is fixedly installed at the lower end of the rotating shaft 13. A rotating cage 5 is sleeved on the outside of the discharge pipe of the discharge hopper 3 between the material distribution plate 4 and the annular plate 6. The upper end of the rotating cage 5 is attached to the bottom surface of the annular plate 6, and the lower end is fixedly connected to the material distribution plate 4 through multiple inclined support rods 51.

[0018] In this embodiment, the controller uses frequency conversion to control the motor 21 to drive the drive pulley 22 to rotate, so that the drive pulley 22 drives the driven pulley 23 to rotate synchronously through the transmission belt 24. The driven pulley 23 drives the rotating shaft 13 to rotate coaxially. The rotating shaft 13 drives the material distribution plate 4, support rod 51, and rotating cage 5 to rotate relative to the feeding hopper 3, so that the coarse and fine materials released from the feeding hopper 3 onto the material distribution plate 4 are dispersed to all sides under the action of centrifugal force. An exhaust port 14 is provided on the side wall of the shell 11 above the annular plate 6. The exhaust port 14 is connected to an exhaust pipe for discharging powder. An airflow dispersion ring is provided on the inner wall of the lower end of the shell 11. An annular groove 31 is provided on the top of the airflow dispersion ring 3. An annular filter plate 33 is installed at the top of the groove 31. The annular filter plate 33 is covered with vertically penetrating filter holes to prevent coarse material from entering the interior of the annular groove 31. The annular filter plate 33 is installed at an angle along the annular groove 31, with the outside higher than the inside, so that the coarse material falling on its surface slides down the slope. An air inlet is opened at the bottom of the annular groove 31. The air inlet pipe 12 extends out of the shell through the lower side wall of the shell and is connected to a high-pressure centrifugal fan with an air volume of 5000m³ / h through a pipeline. The lower end of the shell 11 is conical to facilitate the guidance and collection of coarse material to the bottom of the shell 11, and is connected to a discharge pipe 74. A discharge valve 77 is installed on the discharge pipe 74 to discharge the coarse material separated by the air.

[0019] In this embodiment, see Figure 3 The rotating cage 5 includes an upper ring plate and a lower ring plate arranged coaxially, and multiple vertically arranged guide vanes evenly distributed between the two. The upper ring plate and the lower ring plate are both hollow circular plates. The upper ring plate is installed close to the bottom surface of the annular plate 6. The upper ring plate is movably sleeved on the upper end of the discharge pipe of the discharge hopper 3 through its central hole and can rotate relative to the discharge hopper 3 and the annular plate 6. The lower ring plate is movably sleeved on the lower end of the discharge pipe of the discharge hopper 3 through its central hole. The upper ring plate and the lower ring plate are fixedly connected to the rotating shaft 13 through multiple radial support rods 51. The plate surface of the guide vanes is installed at a 45-degree angle to the radial plane.

[0020] In this embodiment, see Figure 3 The top surface of the material tray 15 is an upwardly convex conical or spherical surface, which accelerates the material separation from the material tray 15. The surface of the material tray 15 may be coated with a non-stick coating to prevent material from sticking.

[0021] In this embodiment, see Figure 3 The top surface of the material distribution tray 15 is provided with radially distributed guide ridges, which uniformly disperse the material onto the material distribution tray 15 and increase the uniformity of material dispersion.

[0022] Preferably, see Figure 3An annular partition plate 32 is provided in the middle of the annular groove 31. Multiple air outlets 76 are evenly arranged on the annular partition plate 32 along the circumferential direction, so that the air entering the annular groove 31 is evenly dispersed and discharged from each air outlet. Each air outlet can be selected to have the same rectangular shape, which facilitates the even distribution of air and keeps the air volume consistent.

[0023] In this embodiment, see Figure 2 The feed pipe 12 extends obliquely into the inside of the housing 11, which facilitates the direct introduction of materials into the hopper 3, making the feeding smoother and preventing blockage.

[0024] In this embodiment, see Figure 1 , 2 3. A discharge valve 77 is installed on the discharge pipe 74 to prevent the discharge of material from the discharge pipe 74 from affecting the powder classifier.

[0025] In this embodiment, multiple inspection ports and inspection doors may also be provided on the side wall of the housing 11 to facilitate the inspection and maintenance of the components inside the air classifier body 1.

[0026] In this embodiment, the side wall of the housing above the annular plate is provided with an exhaust port connected to an external dust collector.

[0027] The working principle of this utility model is as follows: 1. The ground material (containing a mixture of particles of varying sizes) from the upstream mill or conveying equipment is fed into the classifier body 1 through the inclined feed pipe 12. The material first falls into the fixed inverted conical discharge hopper 3. This process facilitates confluence and buffering, gathering any material that may have deviated from the center to the central point. This prevents the material from directly and at high speed impacting the rotating components below, allowing the material to flow downwards in a relatively stable and concentrated manner.

[0028] 2. The material flows out from the discharge pipe at the bottom of the hopper 3 and falls directly onto the high-speed rotating material distribution disc 4. Driven by the motor 21 and the transmission system, the material distribution disc 4 rotates at high speed together with the rotating shaft 13. The material falling onto the material distribution disc 4 instantly gains a huge centrifugal acceleration and is violently and evenly scattered in all directions, forming a relatively uniform, umbrella-shaped three-dimensional material curtain in the space between the annular plate 6 and the material distribution disc 4.

[0029] 3. The airflow generated by the high-pressure blower enters the bottom of the annular groove 71 of the airflow distributor 7 through the inlet pipe 73. The airflow is first initially stabilized in the groove, and then passes through the evenly distributed rectangular air outlets 76 on the annular partition plate 75. These air outlets 76 perform the first throttling and guiding of the airflow, making it evenly distributed in the circumferential direction. Subsequently, the airflow continues upward and passes through the annular filter plate 72 at the top. This annular filter plate 72 (perforated plate) performs the final "rectification", eliminating possible eddies, thereby forming a stable and uniform upward airflow field across the entire cross-section of the classifier. When the centrifugally dispersed material curtain enters this uniform upward airflow field, some coarse material impacts the inner wall of the shell 11 and falls downward to be collected, while other coarse material and fine powder move upward with the airflow, attempting to enter the rotating drum. Each particle attempting to enter the rotating drum is simultaneously subjected to two opposing forces generated by the rotation of the drum, directed outward, attempting to throw the particles towards the inner wall of the shell. The upward airflow attempts to "pull" the particles into the interior of the rotating drum; the fine powder has a small mass and a relatively large surface area. The aerodynamic force they experience is greater than the centrifugal force. Therefore, they cannot resist the "attraction" of the airflow and are drawn into the high-speed rotating drum. The guide vanes on the drum guide and stabilize the inhaled airflow and fine powder, preventing turbulence inside. Coarse powder has a large mass and high inertia. The centrifugal force it experiences is much greater than the aerodynamic force. Therefore, it overcomes the airflow resistance and is struck by the guide vanes of the rotating drum 5, continuing to be flung towards the inner wall of the shell. After colliding with the inner wall or losing kinetic energy, their main force becomes gravity, and they begin to sink downwards.

[0030] 4. All fine powder carried into the rotating drum 5 moves upward with the airflow, passing through the annular channel between the mounting hole in the middle of the annular plate 6 and the feed pipe, entering the upper area of ​​the classifier. Finally, it is led out through the exhaust port on the side wall of the shell 11 and enters subsequent equipment such as a bag filter for gas-solid separation, becoming the final product. Coarse powder falling along the inner wall of the shell collects at the bottom of the conical shell 11. Under the action of gravity, it is discharged continuously or intermittently from the machine through the discharge pipe 74 and controlled by the discharge valve 77 (such as a flap valve). This coarse powder is usually returned to the mill for further grinding, forming a closed-loop circulation system.

[0031] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0032] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A dynamic classifier for cement production, comprising a classifier body (1), the classifier body (1) comprising a housing (11), a feed pipe (12) provided at the top of the housing (11), and a rotating shaft (13) vertically arranged inside the housing (11), characterized in that: The top of the housing (11) is provided with a drive mechanism (2) for driving the rotation of the rotating shaft (13); the rotating shaft (13) is coaxially provided from top to bottom with an inverted conical hopper (3) fixedly connected to the housing (11), a material distribution plate (4) and a rotating cage (5) that rotate with the shaft; an annular plate (6) fixedly connected to the housing (11) is provided below the hopper (3), and the lower end of the hopper (3) passes through the middle mounting hole of the annular plate (6) and extends to the bottom of the rotating cage (5). The rotating cage (5) is fitted outside the hopper (3) and located between the annular plate (6) and the material distribution plate (4); the side wall of the shell (11) above the annular plate (6) is provided with an exhaust port (14); the inner wall of the lower end of the shell (11) is provided with an airflow distributor (7), the airflow distributor (7) is provided with an annular groove (71), the top of the annular groove (71) is provided with an annular filter plate (72), the bottom is connected with an air inlet pipe (73), and the bottom of the shell (11) is provided with a discharge pipe (74).

2. The dynamic powder classifier for cement production according to claim 1, characterized in that, The drive mechanism (2) includes a motor (21) fixed to the top of the housing (11). The output shaft of the motor (21) faces upward and is connected to a drive pulley (22). The upper end of the rotating shaft (13) is connected to a driven pulley (23). The drive pulley (22) and the driven pulley (23) are connected by a transmission belt (24).

3. The dynamic powder classifier for cement production according to claim 1, characterized in that, The rotating drum (5) is fixedly connected to the bulk material tray (4) by multiple support rods (51).

4. A dynamic powder classifier for cement production according to claim 1, characterized in that, The annular groove (71) is divided in the middle by an annular partition plate (75), and the annular partition plate (75) is provided with multiple air outlets (76) at intervals along the circumference.

5. A dynamic powder classifier for cement production according to claim 1, characterized in that, The feed pipe (12) extends obliquely into the interior of the housing (11).

6. A dynamic powder classifier for cement production according to claim 1, characterized in that, The discharge pipe (74) is equipped with a discharge valve (77).

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