Multi-stage screening and separating machine for cement raw material preparation

Abstract

The application discloses a multi-stage screening and powder selecting machine for cement raw material preparation, and relates to the technical field of cement raw material preparation.The machine comprises a main body, which comprises a shell, a cage rotor for particle sorting is installed in the middle of the inner top wall of the shell through a rotating transmission mechanism, a support is installed on the bottom wall of the shunt hopper through a rotating transmission mechanism two, and an anti-accumulation mechanism and a material scattering mechanism are arranged on the support.The advantage is that the top wall of the first material scattering blade is no longer subjected to the continuous impact and scouring of the particles to be sorted through the cooperation of the second material scattering blade and the anti-accumulation mechanism, which avoids the thinning of the thickness of the first material scattering blade, the appearance of pits and even edge rupture due to wear and scouring, and the particles to be sorted maintain correct scattering trajectories, which is beneficial to improving the sorting effect;the weight of the first and second material scattering blades is increased due to the raw material skin, which destroys the dynamic balance and prevents the dispersion effect from being affected.

Description

Technical Field

[0001] This invention relates to the field of cement raw meal preparation technology, and in particular to a multi-stage screening and classifying machine for cement raw meal preparation. Background Technology

[0002] Cement raw meal preparation involves mixing, grinding, and homogenizing raw materials such as limestone, clay, and iron powder in a specific ratio to produce raw meal with stable composition and suitable particle size, preparing it for subsequent clinker calcination. In the cement raw meal preparation process, multi-stage screening and classifying mills are mainly used in closed-circuit grinding systems to promptly separate the already finely ground, qualified raw meal, separating coarse powder and returning it to the mill for further grinding, thereby controlling the fineness of the finished product.

[0003] Currently, the most common type of multi-stage screening and classifying air classifier is the three-stage separation air classifier. This type can separate coarse, medium-coarse, and fine powder in a single pass. The structure of a three-stage separation air classifier typically includes a feeding disc, a cage rotor, guide vanes, a central collecting cone (or sleeve), and an external independent cyclone separator. The feeding disc consists of multiple circumferentially distributed blades used to catch falling material and use centrifugal force to evenly and umbrella-like disperse it in all directions. However, during the continuous fall of the material, the surface of the feeding disc is subjected to continuous impact and erosion, leading to thinning of the disc, pitting, and even edge cracking. The worn disc surface alters the material dispersion. The trajectory makes it impossible to form an ideal uniform material curtain, thus reducing the dispersion effect; and continuous friction will cause the surface temperature of the blades to rise, thus accelerating the wear rate; furthermore, due to the huge surface area and strong adhesion of the extremely fine powder in the material, when the outer shell of the air classifier is not properly insulated, a temperature difference will occur between the feeding surface and the back of the feeding disc. A layer of raw material will adhere to the back of the feeding disc. Once the crust begins to form, the rough crust surface is more likely to capture and adhere subsequent powder materials, continuously self-intensifying, thickening and hardening, resulting in an increase in the weight of the feeding disc, disrupting the dynamic balance during rotation, further changing the dispersion effect, and affecting the sorting efficiency.

[0004] Therefore, in order to improve the dispersion effect and improve the sorting efficiency, this invention provides a multi-stage screening and classifying machine for cement raw material preparation. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and to propose a multi-stage screening and classifying machine for cement raw meal preparation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-stage screening and classifying air classifier for cement raw meal preparation, comprising an air classifier body, wherein the air classifier body includes an air classifier shell, and a guide pipe is installed on the outer top wall of the air classifier shell; a cage-shaped rotor for classifying particles is installed in the middle of the inner top wall of the air classifier shell through a rotary transmission mechanism; and a diversion hopper is rotatably connected to the bottom of the cage-shaped rotor and fixed to the inner wall of the air classifier shell through a connecting column.

[0007] The air classifier housing is connected to a cyclone separator via a fine powder discharge pipe for gas-solid separation of the incoming airflow containing fine powder. The air classifier housing is also equipped with a medium-coarse powder discharge outlet, a coarse powder discharge outlet, and an air inlet. The bottom wall of the diversion hopper is equipped with a support member via a rotary transmission mechanism, and the support member is equipped with an anti-accumulation mechanism and a material spreading mechanism.

[0008] The anti-accumulation mechanism includes a conical ring sleeve fitted onto the upper side wall of the support member, and the conical ring sleeve is provided with multiple anti-accumulation components for changing the falling position of the particles to be sorted; the material spreading mechanism includes multiple material spreading blades fixedly connected to the lower side wall of the support member, the multiple material spreading blades being distributed along the circumferential direction, and the support member being provided with material spreading components distributed corresponding to the material spreading blades. The material spreading components are used to cover the material spreading blades by adjusting their positions to perform intermittent alternating material spreading without stopping the machine.

[0009] In the above-mentioned multi-stage screening and classifying machine for cement raw meal preparation, the feed pipe is located inside the casing of the classifier. Part of the pipe passes through the inside of the cage rotor from top to bottom, guiding the particles to be classified to the middle of the diversion hopper. The cage rotor includes several vertical guide vanes that are fixedly connected in the circumference. The cage rotor generates centrifugal force on the particles to be classified by rotating. The airflow generated by the rotation of the vertical guide vanes generates a centripetal drag force on the particles to be classified, thus performing the classification operation.

[0010] In the above-mentioned multi-stage screening and classifying air classifier for cement raw meal preparation, the fine powder discharge pipe is installed on the upper side wall of the air classifier shell, the hopper-shaped bottom of the air classifier shell has a medium and coarse powder discharge outlet on the left side, and the hopper-shaped bottom of the air classifier shell has a coarse powder discharge outlet. The lower right side wall of the air classifier shell has an air inlet, which blows air onto the umbrella-shaped material curtain after the material is spread by the spreading mechanism, and performs the sorting operation in conjunction with the cage rotor.

[0011] In the above-mentioned multi-stage screening and classifying machine for cement raw material preparation, the lower side wall of the diversion hopper is evenly provided with multiple diversion ports along the circumferential direction, and the support includes an inverted support cylinder rotatably connected to the diversion hopper and a base that can be detachably installed at the bottom of the inverted support cylinder.

[0012] In the above-mentioned multi-stage screening and classifying machine for cement raw material preparation, the diameter of the annular top of the conical ring sleeve is smaller than the diameter of the annular bottom. The conical ring sleeve is fixed to the support by bolts. The anti-accumulation component includes multiple adjusting grooves evenly opened along the circumferential direction on the lower side wall of the conical ring sleeve.

[0013] In the above-mentioned multi-stage screening and classifying machine for cement raw material preparation, an electric push rod corresponding to the adjustment groove is hinged to the inner wall of the conical ring sleeve, and an inclined plate is hinged to the extended end of the electric push rod. The middle part of the inclined plate is hinged to the inner wall of the conical ring sleeve, and the end of the inclined plate away from the electric push rod passes through the adjustment groove.

[0014] In the above-mentioned multi-stage screening and classifying machine for cement raw material preparation, the first spreading blade corresponds to the inclined plate, the spreading component includes the second adjusting groove, and the lower side wall of the support member is provided with the second adjusting groove distributed in the circumferential direction in accordance with the first spreading blade. The second adjusting groove is in an inclined arc shape adapted to the first spreading blade.

[0015] In the above-mentioned multi-stage screening and classifying machine for cement raw material preparation, a motor is installed on the top wall of the inverted support cylinder of the support member, and a rotating seat is fixed to the bottom wall of the output end of the motor and rotatably connected to the inner wall of the support member. Multiple adjusting grooves three corresponding to adjusting groove two are opened on the side wall of the rotating seat along the circumferential direction.

[0016] In the above-mentioned multi-stage screening and classifying machine for cement raw material preparation, a sliding block is slidably connected to the upper and lower parts of the adjusting trough three, and a second spreading blade is detachably installed on the side of the sliding block away from the rotating seat. The first spreading blade and the second spreading blade are vertically corresponding.

[0017] In the above-mentioned multi-stage screening and classifying machine for cement raw material preparation, both the first and second spreading blades are fan-shaped and inclined. A scraper is fixedly connected to one straight edge of both the first and second spreading blades. The beginning and end of the second adjusting groove are circumferentially connected to arc-shaped sliders for dust prevention via springs.

[0018] Compared with existing technologies, the advantages of this invention are as follows: 1. By covering the first spreading blade with the second spreading blade and cooperating with the anti-accumulation component, the top wall of the first spreading blade is no longer subjected to continuous impact and scouring by the particles to be sorted, avoiding the thinning of the first spreading blade, pitting, or even edge cracking due to wear and scouring. The particles to be sorted maintain the correct throwing trajectory, which is conducive to improving the sorting effect; the inclined plate guides the particles to be sorted to fall by repeatedly moving up and down through the electric push rod, avoiding continuous impact on the same position.

[0019] 2. The intermittent alternation of the first and second spreading blades can be achieved without stopping the machine, which helps to improve sorting efficiency; and avoids the continuous impact that causes the surface temperature of the first and second spreading blades to rise, accelerating wear, which helps to extend the service life of the first and second spreading blades.

[0020] 3. During the repositioning of the second spreading blade, the first spreading blade and the second spreading blade scrape and clean the raw material crust between them to prevent the raw material crust from increasing the weight of the first spreading blade and the second spreading blade, disrupting the dynamic balance, and preventing the dispersion effect and sorting efficiency from being affected. Attached Figure Description

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the overall structure.

[0023] Figure 2 This is a partial cross-sectional structural diagram of the air classifier body.

[0024] Figure 3 This is a partial structural diagram of the diversion hopper, support components, anti-accumulation mechanism, and material spreading mechanism.

[0025] Figure 4 This is a partial structural diagram of the support component, anti-accumulation mechanism, and material spreading mechanism.

[0026] Figure 5 This is a schematic diagram showing the changes before and after the inclined plate moves upward.

[0027] Figure 6 This is a partial exploded view of the material spreading mechanism.

[0028] Figure 7 This is a schematic diagram showing the changes in the spreading blades before and after rotation.

[0029] Figure 8 This is a schematic diagram of the cross-sectional structure of the rotating base.

[0030] Figure 9 This is a schematic diagram of the structure of the second adjusting groove.

[0031] In the diagram: 1. Air classifier body; 11. Air classifier shell; 12. Feed guide pipe; 13. Cage rotor; 14. Fine powder discharge pipe; 15. Cyclone; 16. Medium and coarse powder discharge outlet; 17. Coarse powder discharge outlet; 18. Air inlet; 2. Diverting hopper; 3. Support component; 4. Anti-accumulation mechanism; 41. Conical ring sleeve; 42. Anti-accumulation component; 421. Adjusting groove one; 422. Inclined plate; 423. Electric push rod; 5. Spreading mechanism; 51. Spreading blade one; 52. Spreading component; 521. Adjusting groove two; 522. Spreading blade two; 523. Sliding block; 524. Rotary seat; 525. Adjusting groove three; 526. Motor; 53. Scraper. Detailed Implementation

[0032] 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.

[0033] Reference Figures 1 to 2 A multi-stage screening and classifying air classifier for cement raw meal preparation includes an air classifier body 1, which includes an air classifier housing 11. A guide pipe 12 is installed on the outer top wall of the air classifier housing 11. A cage rotor 13 for classifying particles is installed in the middle of the inner top wall of the air classifier housing 11 through a rotary transmission mechanism (not shown in the figure, and the mechanism is an existing device driven by a motor, which will not be described in detail here). The bottom of the cage rotor 13 is rotatably connected to a diversion hopper 2 that is fixed to the inner wall of the air classifier housing 11 through a connecting column. The air classifier housing 11 is connected to a cyclone 15 for gas-solid separation of the airflow containing fine powder through a fine powder discharge pipe 14. The air classifier housing 11 is also provided with a medium and coarse powder discharge outlet 16, a coarse powder discharge outlet 17 and an air inlet 18. The bottom wall of the diversion hopper 2 is equipped with a support member 3 through a rotary transmission mechanism 2 (not shown in the figure, and this mechanism is an existing device driven by a motor, which will not be described in detail here). The support member 3 is provided with an anti-accumulation mechanism 4 and a material spreading mechanism 5.

[0034] Reference Figures 1 to 2 The feed pipe 12 is located inside the air classifier housing 11. The part of the pipe passes through the inside of the cage rotor 13 from top to bottom and guides the particles to be sorted to the middle of the diversion hopper 2. The cage rotor 13 includes several vertical guide vanes that are fixedly connected in the circumference. The cage rotor 13 generates centrifugal force on the particles to be sorted by rotating. The airflow generated by the rotation of the vertical guide vanes generates a centripetal drag force on the particles to be sorted, thus performing the sorting operation.

[0035] Reference Figures 1 to 2The fine powder discharge pipe 14 is installed on the upper side wall of the classifier housing 11. The left side of the bucket-shaped bottom of the classifier housing 11 is provided with a medium and coarse powder discharge outlet 16, the bottom of the bucket-shaped bottom of the classifier housing 11 is provided with a coarse powder discharge outlet 17, and the lower right side wall of the classifier housing 11 is provided with an air inlet 18. The air inlet 18 blows air onto the umbrella-shaped material curtain after the material is spread by the spreading mechanism 5, and works with the cage rotor 13 to perform the sorting operation.

[0036] Reference Figures 2 to 3 The lower side wall of the diversion hopper 2 is evenly provided with multiple diversion ports along the circumferential direction. The support member 3 includes an inverted support cylinder that is rotatably connected to the diversion hopper 2 and a base that can be detachably installed at the bottom of the inverted support cylinder.

[0037] The particles to be sorted enter the separator housing 11 through the feed pipe 12 and fall into the diversion hopper 2 as guided by the feed pipe 12. The diversion hopper 2 is located directly below the cage rotor 13 and directly above the spreading mechanism 5. The particles are initially dispersed to the spreading mechanism 5 through multiple diversion ports of the diversion hopper 2. After being spread, the falling position is intermittently changed by the anti-accumulation mechanism 4 to avoid continuous impact on the spreading mechanism 5. The two sets of blades of the spreading mechanism 5 alternately spread the material intermittently without stopping the machine. Using centrifugal force, the material is evenly and umbrella-shaped and scattered in all directions to form a uniform material curtain, ensuring that the airflow entering from the air inlet 18 can fully contact the material.

[0038] The air inlet 18 blows the material upward to the cage rotor 13. The cage rotor 13 generates centrifugal force on the particles to be sorted by rotating. The airflow generated by the rotation of the vertical guide vanes generates a centripetal drag force on the particles to be sorted, thus performing the sorting operation.

[0039] After screening, the airflow carrying fine powder enters the cyclone 15 for gas-solid separation through the fine powder discharge pipe 14. After processing by the cyclone 15, it becomes the fine powder product. The medium and coarse powder is not fully lifted by the airflow, or is collected in the medium and coarse powder discharge port 16 during the falling process. The coarser particles cannot pass through the strong centrifugal force field generated by the cage rotor 13 and are thrown against the inner wall of the classifier housing 11. After losing kinetic energy, they fall along the wall and are discharged from the bottom coarse powder discharge port 17, thus achieving the final multi-stage separation operation.

[0040] Reference Figures 2 to 5The anti-accumulation mechanism 4 includes a conical ring sleeve 41 sleeved and installed on the upper side wall of the support member 3. The conical ring sleeve 41 is provided with multiple anti-accumulation components 42 for changing the falling position of the particles to be sorted. The diameter of the annular top of the conical ring sleeve 41 is smaller than the diameter of the annular bottom. The conical ring sleeve 41 is fixed to the support member 3 by bolts. The anti-accumulation component 42 includes multiple adjustment grooves 421 evenly opened along the circumferential direction on the lower side wall of the conical ring sleeve 41. An electric push rod 423 corresponding to the adjustment groove 421 is hinged to the inner wall of the conical ring sleeve 41. An inclined plate 422 is hinged to the extended end of the electric push rod 423. The middle part of the inclined plate 422 is hinged to the inner wall of the conical ring sleeve 41. The end of the inclined plate 422 away from the electric push rod 423 passes through the adjustment groove 421.

[0041] Reference Figures 3 to 4 The spreading mechanism 5 includes multiple spreading blades 51 fixedly connected to the lower side wall of the support member 3. The multiple spreading blades 51 are distributed along the circumferential direction. The support member 3 is provided with spreading components 52 that are distributed corresponding to the spreading blades 51. The spreading components 52 are used to cover the spreading blades 51 by adjusting their position to spread material intermittently without stopping the machine.

[0042] Reference Figures 3 to 9 The first spreading blade 51 corresponds to the inclined plate 422. The spreading assembly 52 includes an adjustment groove 521. The lower side wall of the support member 3 is provided with adjustment grooves 521 distributed in a circumferential direction, corresponding to the first spreading blade 51. The adjustment grooves 521 are in an inclined arc shape adapted to the first spreading blade 51. A motor 526 is installed on the top wall of the inverted support cylinder of the support member 3. The bottom wall of the output end of the motor 526 is fixed with a rotating seat 524 rotatably connected to the inner wall of the support member 3. The side wall of the rotating seat 524 is provided with multiple grooves corresponding to the second spreading groove 521 in a circumferential direction. Adjustment groove three 525; a sliding block 523 is slidably connected up and down inside the adjustment groove three 525. A second spreading blade 522 is detachably installed on the side of the sliding block 523 away from the rotating seat 524. The first spreading blade 51 and the second spreading blade 522 are vertically corresponding. The first spreading blade 51 and the second spreading blade 522 are both fan-shaped and inclined. A scraper 53 is fixedly connected to one straight edge of the first spreading blade 51 and the second spreading blade 522. The beginning and end of the adjustment groove two 521 are circumferentially slidably connected to an arc-shaped slider for dust prevention by a spring (not shown in the figure).

[0043] The electric actuator 423 continuously reciprocates. When the electric actuator 423 extends towards the support member 3, it pushes the inclined plate 422 down towards the end near the support member 3. Since the middle part of the inclined plate 422 is hinged to the inner wall of the conical ring sleeve 41, it forms a lever shape, and the end of the inclined plate 422 away from the support member 3 is raised. The adjusting groove 421 provides adjustment space for the inclined plate 422. When the electric actuator 423 retracts, it drives the inclined plate 422 to move down and reset. In this way, the inclined plate 422 is cyclically moved up and down by the electric actuator 423 (e.g., Figure 5 (As shown).

[0044] When the particles are initially dispersed to the spreading mechanism 5 through the multiple diversion ports of the diversion hopper 2, the particles to be sorted first fall on the side wall of the cone ring sleeve 41 and slide down from top to bottom. When sliding down, they pass through the end of the inclined plate 422 away from the support member 3. The inclined plate 422, which moves up and down, guides the particles to be sorted to fall, avoiding continuous impact on the same position.

[0045] The bottom output end of motor 526 rotates intermittently at low speed in both directions, driving the rotating seat 524 to rotate slowly. The rotation of the rotating seat 524 causes the sliding block 523 and the second spreading blade 522 to move. Due to the restriction of the second adjusting groove 521, the sliding block 523 and the second spreading blade 522 simultaneously slide up and down on the third adjusting groove 525 during the rotational displacement.

[0046] by Figure 3 As shown, the particles to be sorted are guided to fall by the conical ring sleeve 41 and the inclined plate 422. The support 3 is driven to rotate at high speed by the rotary transmission mechanism 2. The falling particles to be sorted first fall onto the high-speed rotating spreading blade 51. The spreading blade 51 breaks up the agglomerated material by centrifugal force and throws it out horizontally or in an umbrella shape to form a uniform and dispersed material curtain.

[0047] by Figure 7 As shown, the initial state of the spreading blade 1 51 and the spreading blade 2 522 is that they are stacked one on top of the other, with spreading blade 1 51 on top of spreading blade 2 522, and spreading blade 2 522 located at the lowest point on the adjusting groove 2 521 (as shown). Figure 7 As shown in the diagram above, after being driven to rotate by motor 526, the second spreading blade 522 slides on the second adjusting groove 521. The second spreading blade 522 gradually intersects with the first spreading blade 51, and the position of the second spreading blade 522 changes from below the corresponding first spreading blade 51 to above the adjacent first spreading blade 51 (as shown in the diagram above). Figure 7 As shown in the middle figure), when the second spreading blade 522 slides to the highest point on the second adjusting groove 521, the position of the second spreading blade 522 completely changes to above the adjacent first spreading blade 51, and the second spreading blade 522 and the first spreading blade 51 overlap again (as shown in the middle figure). Figure 7 As shown in the figure below, after the motor 526 reverses, it drives the second spreading blade 522 to reset, thereby completing the alternating up and down switching of multiple spreading blades 51 and multiple spreading blades 522. Through the covering of spreading blade 51 by spreading blade 522 and the cooperation with the anti-accumulation component 42, the top wall of spreading blade 51 is no longer subjected to continuous impact and scouring by the particles to be sorted. This avoids the thinning of spreading blade 51, pitting, or even edge cracking due to wear and scouring. The particles to be sorted maintain the correct throwing trajectory, which is conducive to improving the sorting effect.

[0048] The intermittent alternating operation of spreading blade 1 51 and spreading blade 2 522 can be achieved without stopping the machine, which is beneficial to improving sorting efficiency; and avoids the continuous impact that causes the surface temperature of spreading blade 1 51 and spreading blade 2 522 to rise, accelerate wear, and help extend the service life of spreading blade 1 51 and spreading blade 2 522.

[0049] During the repositioning of the second spreading blade 522, the second spreading blade 522 drives the scraper 53 on it to slide closely against the bottom wall of the corresponding upper spreading blade 51. The scraper 53 scrapes off the raw material crust adhering to the bottom wall of the spreading blade 51. At the same time, when the second spreading blade 522 slides above the adjacent spreading blade 51, the scraper 53 on the adjacent spreading blade 51 scrapes off the raw material crust adhering to the bottom wall of the second spreading blade 522. This prevents the raw material crust from increasing the weight of the spreading blades 51 and 522, disrupting the dynamic balance, and preventing the dispersion effect and sorting efficiency from being affected.

[0050] It should be noted that when the second spreading blade 522 slides on the second adjusting groove 521, the two arc-shaped sliders are kept in close contact with the sliding part of the second spreading blade 522 on the second adjusting groove 521 by the elastic force of the spring. This ensures that the second adjusting groove 521 remains relatively closed when the second spreading blade 522 changes position, thus achieving a dustproof effect and reducing the amount of dust particles entering the support 3 and adhering to the parts.

[0051] In this invention, by covering the first spreading blade 51 with the second spreading blade 522 and cooperating with the anti-accumulation component 42, the top wall of the first spreading blade 51 is no longer subjected to continuous impact and scouring by the particles to be sorted. The particles to be sorted maintain the correct throwing trajectory. The intermittent alternating operation of the first spreading blade 51 and the second spreading blade 522 can be achieved without stopping the machine, thereby improving the sorting effect and sorting efficiency. Furthermore, during the process of the second spreading blade 522 covering the first spreading blade 51, the raw material skin is scraped and cleaned off between them, further improving the dispersion effect and sorting efficiency. Although this invention adds the anti-accumulation component 42 and the spreading component 52, increasing the equipment cost, the technical solution of this invention does not require stopping the machine to replace the spreading structure and can also perform self-cleaning operations. From a long-term economic perspective, the equipment cost of this invention compared to the prior art is negligible.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multi-stage screening and classifying air classifier for cement raw meal preparation, comprising an air classifier body, characterized in that, The main body of the air classifier includes an air classifier housing, and a guide pipe is installed on the outer top wall of the air classifier housing. A cage rotor for sorting particles is installed in the middle of the inner top wall of the air classifier housing through a rotary transmission mechanism. The bottom of the cage rotor is rotatably connected to a diversion hopper that is fixed to the inner wall of the air classifier housing through a connecting column. The air classifier housing is connected to a cyclone separator for gas-solid separation of airflow containing fine powder through a fine powder discharge pipe. The air classifier housing is also provided with a medium-coarse powder discharge outlet, a coarse powder discharge outlet and an air inlet. The bottom wall of the diversion hopper is equipped with a support member through a rotary transmission mechanism, and the support member is provided with an anti-accumulation mechanism and a material spreading mechanism. The anti-accumulation mechanism includes a conical ring sleeve fitted onto the upper side wall of the support member, and the conical ring sleeve is provided with multiple anti-accumulation components for changing the falling position of the particles to be sorted. The spreading mechanism includes multiple spreading blades fixedly connected to the lower side wall of the support member. The multiple spreading blades are distributed along the circumferential direction. The support member is provided with spreading components distributed corresponding to the spreading blades. The spreading components are used to cover the spreading blades by adjusting their positions to perform intermittent and alternating spreading without stopping the machine. The diameter of the annular top of the conical ring sleeve is smaller than the diameter of the annular bottom. The conical ring sleeve is fixed to the support by bolts. The anti-accumulation component includes a plurality of adjustment grooves evenly opened along the circumferential direction on the lower side wall of the conical ring sleeve. The inner wall of the conical ring sleeve is hinged with an electric push rod corresponding to the adjustment groove, and the extended end of the electric push rod is hinged with an inclined plate. The middle part of the inclined plate is hinged to the inner wall of the conical ring sleeve, and the end of the inclined plate away from the electric push rod passes through the adjustment groove. The first spreading blade corresponds to the inclined plate. The spreading assembly includes an adjustment groove 2. The lower side wall of the support member is provided with an adjustment groove 2 distributed in a circumferential direction, which corresponds to the first spreading blade. The adjustment groove 2 is in an inclined arc shape adapted to the first spreading blade. A motor is installed on the top wall of the inverted support cylinder of the component, and a rotating seat is fixed to the bottom wall of the output end of the motor and rotatably connected to the inner wall of the support component. Multiple adjusting grooves three corresponding to adjusting groove two are opened on the side wall of the rotating seat along the circumferential direction. The adjusting groove three is slidably connected to a sliding block, and a second spreading blade is detachably installed on the side of the sliding block away from the rotating seat. The first spreading blade and the second spreading blade are vertically corresponding.

2. The multi-stage screening and classifying machine for cement raw meal preparation according to claim 1, characterized in that, The feed pipe is located inside the air classifier housing. The part of the pipe passes through the inside of the cage rotor from top to bottom and guides the particles to be sorted to the middle of the diversion hopper. The cage rotor includes several vertical guide vanes that are fixedly connected in the circumference. The cage rotor generates centrifugal force on the particles to be sorted by rotating. The airflow generated by the rotation of the vertical guide vanes generates a centripetal drag force on the particles to be sorted, thus performing the sorting operation.

3. The multi-stage screening and classifying machine for cement raw meal preparation according to claim 1, characterized in that, The fine powder discharge pipe is installed on the upper side wall of the air classifier housing. The left side of the bucket-shaped bottom of the air classifier housing is provided with a medium and coarse powder discharge outlet, and the bottom of the bucket-shaped bottom of the air classifier housing is provided with a coarse powder discharge outlet. The lower right side wall of the air classifier housing is provided with an air inlet. The air inlet blows air onto the umbrella-shaped material curtain after the material is spread by the spreading mechanism, and works with the cage rotor to perform the sorting operation.

4. The multi-stage screening and classifying machine for cement raw meal preparation according to claim 1, characterized in that, The lower sidewall of the diversion hopper is evenly provided with multiple diversion ports along the circumferential direction. The support includes an inverted support cylinder that is rotatably connected to the diversion hopper and a base that can be detachably installed at the bottom of the inverted support cylinder.

5. A multi-stage screening and classifying machine for cement raw meal preparation according to claim 1, characterized in that, Both the first and second spreading blades are fan-shaped and inclined. A scraper is fixedly connected to one straight edge of each of the first and second spreading blades. The beginning and end of the second adjusting groove are circumferentially connected to arc-shaped sliders for dust prevention via springs.

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