An expanding agent raw material crushing device with a particle size grading function and a working method thereof

Abstract

This invention relates to a grinding device for expanding agent raw materials with particle size classification function and its working method. The device includes a base plate, a main grinding unit, at least one auxiliary grinding unit, a transmission unit, and a classification and screening unit. The main grinding unit includes a main cylinder and a first drive assembly, and the auxiliary grinding unit includes an auxiliary cylinder and a second drive assembly. The auxiliary grinding unit is located on the circumferential outer side of the main cylinder. The transmission unit connects the main cylinder and the auxiliary cylinder and is configured to drive the auxiliary cylinder to rotate synchronously when the main cylinder rotates. It also has a variable transmission ratio to adjust the speed ratio. The classification and screening unit includes multiple movable discharge grates and fixed discharge grates arranged sequentially along the material conveying direction, dividing the inside of the cylinder into multiple ball mill chambers. This invention achieves independent driving of the main and auxiliary cylinders, multi-stage particle size classification, and adjustable grinding chamber length, significantly improving the grinding efficiency of expanding agent raw materials and the stability of finished product quality.

Description

Technical Field

[0001] This invention relates to the field of crushing equipment technology, and in particular to a crushing device for expanding agent raw materials with particle size classification function and its working method. Background Technology

[0002] Expansion agents are an important component of concrete admixtures. Their raw materials mainly include clinker and gypsum, which must be crushed to the specified fineness before they can be used.

[0003] The existing raw material crushing devices for expanding agents mainly have the following technical defects: Low grinding efficiency: Traditional ball mills use a single cylinder structure, where clinker and gypsum are mixed and ground in the same cylinder. Due to the large difference in the grindability of the two (clinker has high hardness and is difficult to grind, while gypsum has low hardness and is easy to grind), the mixed grinding results in over-grinding of gypsum and under-grinding of clinker, leading to serious energy waste. Poor particle size control: Traditional equipment lacks effective particle size classification function, resulting in a wide particle size distribution of the pulverized material, with qualified fine powder mixed with coarse particles, which affects the quality of the finished expansion agent. Fixed grinding chamber length: The grate plate position is fixed, making it impossible to adjust the length of each grinding chamber according to material characteristics and production requirements, resulting in poor adaptability; Non-adjustable rotation speed: When processing multiple materials or adjusting grinding intensity, the rotation speed of the cylinder cannot be flexibly adjusted, which limits the versatility of the device. Summary of the Invention

[0004] The problem solved by this invention is to provide a pulverizing device for expanding agent raw materials with particle size classification function and its working method, which realizes independent driving of main and auxiliary cylinders, multi-stage particle size classification and adjustable grinding chamber length, significantly improving the pulverizing efficiency of expanding agent raw materials and the stability of finished product quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for pulverizing expansion agent raw materials with particle size classification function, comprising: A main grinding unit is disposed on the substrate. The main grinding unit includes a main cylinder and a first driving component for driving the main cylinder to rotate. At least one grinding unit is disposed on the substrate and located on the circumferential outer side of the main cylinder. The secondary grinding unit includes a secondary cylinder and a second driving component for driving the secondary cylinder to translate relative to the substrate. A transmission unit connects the main cylinder and the auxiliary cylinder, and is configured to drive the auxiliary cylinder to rotate synchronously when the main cylinder rotates. The transmission unit has a variable transmission ratio to adjust the speed ratio between the auxiliary grinding unit and the main grinding unit. A grading and screening unit is disposed inside the main cylinder and the auxiliary cylinder. The grading and screening unit includes multiple movable discharge grates and a fixed discharge grates arranged sequentially along the material conveying direction, which divide the inside of the cylinder into multiple ball mill chambers.

[0006] Preferably, the main grinding unit includes: Main cylinder; Two first bearing seats are installed at both ends of the top side of the base plate, and the main cylinder is rotatably installed between the two first bearing seats.

[0007] Preferably, the first driving component includes: Electric motor; A speed reducer, the input end of which is connected to the output end of the motor; A rotating shaft is rotatably mounted between the first bearing seats and connected to the output end of the reducer; The rotating teeth are fixedly mounted on the rotating shaft and mesh with the main outer ring teeth.

[0008] Preferably, the secondary grinding unit further includes: The slide rail is fixedly mounted on the base plate; The translation seat is slidably mounted on the slide rail; Two second bearing seats are fixedly installed at both ends of the top side of the translation seat, and the auxiliary cylinder is rotatably installed between the two second bearing seats.

[0009] Preferably, the second drive component includes at least one first pneumatic cylinder, the cylinder body of which is fixedly disposed on the base plate, and the telescopic end of which is connected to the translation seat.

[0010] Preferably, the transmission unit includes: The main outer ring tooth is fixedly disposed at the end of the main cylinder; A translation ring cover is axially slidably disposed at the end of the secondary cylinder; Multiple slave ring teeth are disposed on the outer side of the translation ring cover, and each slave ring tooth has a different number of teeth; An axial movement mechanism, connected to the translation ring cover, is configured to drive the translation ring cover to move axially, so that any one of the plurality of slave ring teeth selectively engages with the main outer ring tooth.

[0011] Preferably, the axial movement mechanism includes: The rotating ring is rotatably connected to the end of the translation ring cover; At least one second pneumatic cylinder, the cylinder body of which is fixedly disposed with a second bearing seat, and its telescopic end is connected to the rotating ring, for driving the rotating ring and the translation ring cover to move axially; A ring seat is fixedly provided on the outer side of the end of the secondary cylinder, and the translation ring cover is slidably sleeved on the outer side of the ring seat. The outer wall of the ring seat is provided with a plurality of guide grooves along the circumference, and the inner wall of the translation ring cover is provided with a guide rail that slides in cooperation with the guide grooves.

[0012] Preferably, both the movable discharge grate and the fixed discharge grate are provided with discharge troughs, and the diameter of the discharge troughs gradually decreases from the inlet end to the outlet end along the material conveying direction.

[0013] Preferably, it further includes at least one third pneumatic cylinder, the cylinder body of which is installed inside the main cylinder or the auxiliary cylinder, and its telescopic end is connected to the movable discharge grate for driving the movable discharge grate to move axially. The third pneumatic cylinder is provided with a protective cover, and the movable discharge grate is provided with an annular airbag on its outer side.

[0014] A method for operating a puffing agent raw material pulverizing device with particle size classification function, the specific operating steps of which are as follows: The power output from the motor is reduced and amplified by the reducer, driving the rotating shaft to rotate. The rotating teeth on the shaft mesh with the main outer ring teeth at the end of the main cylinder, causing the main cylinder to rotate around its own axis. The second pneumatic cylinder drives the rotating ring and the translation ring cover to move axially, so that the slave ring teeth with a specific number of teeth on the translation ring cover mesh with the main outer ring teeth. Since the translation ring cover is fixedly connected to the auxiliary cylinder through the ring seat, when the main cylinder rotates, the auxiliary cylinder is driven to rotate synchronously through the meshing transmission of the main outer ring teeth and the slave ring teeth. Different slave ring teeth have different numbers of teeth. By selecting different slave ring teeth to mesh with the main outer ring teeth, the transmission ratio can be changed, thereby adjusting the speed ratio between the auxiliary cylinder and the main cylinder. The operator selects the appropriate slave ring teeth according to the wear-prone characteristics of the material in the auxiliary cylinder, so that the auxiliary cylinder runs at an optimized speed. The first pneumatic cylinder can drive the translation seat to move along the slide rail, so that the auxiliary cylinder moves closer to or away from the main cylinder, which facilitates the meshing and disengagement of the slave ring teeth and the main outer ring teeth. Clinker enters the main cylinder through a screw feeder, while gypsum enters the auxiliary cylinder through the screw feeder. The materials rotate with the cylinder in the ball mill chamber, colliding and grinding with the grinding media, and are gradually crushed. The ground materials move towards the discharge end under the action of airflow and centrifugal force. The materials pass through multiple movable discharge grates and fixed discharge grates in sequence. As the aperture of the discharge trough gradually decreases along the conveying direction, multi-stage particle size classification is achieved. Larger particles are intercepted in the ball mill chamber at the feed end for further grinding, medium-sized particles enter the intermediate ball mill chamber through the front grate for further grinding, and qualified fine particles pass through the last fixed discharge grate and are discharged from the cylinder through the screw feeder. When it is necessary to adjust the axial position of the movable discharge grate to change the length of the ball mill chamber, the annular air bladder is first deflated. The annular air bladder contracts, releasing the radial seal between the movable discharge grate and the inner wall of the cylinder. A gap appears between the movable discharge grate and the inner wall of the cylinder, significantly reducing friction and allowing it to move freely. The third pneumatic cylinder is activated, its telescopic end extending or retracting, driving the movable discharge grate axially to the target position. The third pneumatic cylinder provides axial driving force. Once the movable discharge grate has moved to the target axial position, the third pneumatic cylinder stops driving and remains locked, positioning the movable discharge grate in that position. The annular air bladder is then re-inflated, filling the gap between the movable discharge grate and the inner wall of the cylinder, restoring the radial seal, and the device can then be put back into normal operation. When multiple materials need to be processed or the processing capacity needs to be increased, multiple auxiliary grinding units are set on the circumferential outer side of the main cylinder. Each auxiliary cylinder is connected to the main cylinder through its own transmission unit. Each auxiliary cylinder can independently adjust its own speed ratio by selecting different numbers of teeth on the ring teeth, so as to realize the separate processing of different materials.

[0015] The beneficial effects of this invention are: Clinker enters the main cylinder through a screw feeder, while gypsum enters the auxiliary cylinder through a screw feeder. The two are ground separately in independent cylinders. Due to the large difference in grindability between clinker and gypsum, separate grinding allows for the selection of optimal grinding parameters based on their respective characteristics, avoiding over-grinding of gypsum and under-grinding of clinker caused by mixed grinding, thus improving energy utilization. The axial movement of the translation ring is driven by a second pneumatic cylinder. Different numbers of teeth on the driven ring teeth can be selected to mesh with the main outer ring teeth, changing the transmission ratio and thus independently adjusting the speed ratio between the secondary cylinder and the main cylinder. Operators can select the appropriate driven ring teeth according to the grindability of the material, so that the secondary cylinder operates at an optimized speed, improving grinding efficiency. The discharge trough aperture gradually decreases along the conveying direction. As the material passes through multiple movable discharge grates and fixed discharge grates in sequence, multi-stage particle size classification is achieved: larger particles are intercepted in the ball mill chamber at the feed end for further grinding, medium particles enter the intermediate ball mill chamber for further grinding, and qualified fine particles are discharged through the last stage grate. The classification accuracy is high, the particle size distribution of the finished product is narrow, and the quality stability is improved. The third pneumatic cylinder drives the movable discharge grate to move axially, which can change the length of each ball mill chamber. Before moving, the annular airbag is deflated to release the radial seal and reduce friction. After moving into place, the annular airbag is re-inflated to restore the radial seal, so that the device can quickly adapt to different material characteristics and production requirements, and shorten the changeover time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall first structure of the present invention; Figure 2This is a schematic diagram of the overall second structure of the present invention; Figure 3 This is a schematic diagram of the overall third structure of the present invention; Figure 4 This is a first sectional view of the present invention; Figure 5 This is a second sectional view of the present invention; Figure 6 This is a schematic diagram of the installation structure of the active discharge grate of the present invention.

[0017] Legend: 1. Base plate; 2. First bearing seat; 3. Main cylinder; 4. Slide rail; 5. Translation seat; 6. Second bearing seat; 7. Secondary cylinder; 8. Spiral feed cylinder; 9. Spiral discharge cylinder; 10. Movable discharge grate; 11. Fixed discharge grate; 12. Ball mill chamber; 13. Main outer ring gear; 14. Rotating shaft; 15. Rotating gear; 16. Reducer; 17. Motor; 18. First pneumatic cylinder; 19. Ring seat; 20. Translation ring cover; 21. Driven ring gear; 22. Second pneumatic cylinder; 23. Rotating ring; 24. Protective cover; 25. Third pneumatic cylinder; 26. Discharge trough; 27. Annular airbag. Detailed Implementation

[0018] 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.

[0019] Specific implementation examples are given below.

[0020] See Figures 1-6 An expansion agent raw material crushing device with particle size classification function includes a substrate 1, a main grinding unit, at least one grinding unit, a transmission unit and a classification and screening unit.

[0021] The main grinding unit is mounted on the substrate 1 and includes a main cylinder 3 and a first driving assembly for driving the main cylinder 3 to rotate. Two first bearing seats 2 are mounted on the top sides of the substrate 1. The main cylinder 3 is rotatably mounted between the two first bearing seats 2. The first driving assembly includes a motor 17, a reducer 16, a rotating shaft 14, and rotating gears 15. The input end of the reducer 16 is connected to the output end of the motor 17. The rotating shaft 14 is rotatably mounted between the first bearing seats 2 and connected to the output end of the reducer 16. The rotating gears 15 are fixedly mounted on the rotating shaft 14 and are connected to the main outer ring. The teeth 13 mesh, and the two first bearing seats 2 are symmetrically installed at both ends of the top side of the base plate 1 to provide stable end support for the main cylinder 3, ensuring the smooth operation of the main cylinder 3 under high-speed rotation. The high-speed, low-torque power output by the motor 17 is reduced by the reducer 16, resulting in a decrease in speed and an increase in torque, providing sufficient grinding driving force for the main cylinder 3 to adapt to the high torque working conditions required for crushing the expansion agent raw materials. The rotating teeth 15 on the rotating shaft 14 mesh with the main outer ring teeth 13 at the end of the main cylinder 3 for transmission. The gear meshing transmission ratio is accurate and there is no slippage loss.

[0022] At least one grinding unit is disposed on the substrate 1 and located circumferentially outside the main cylinder 3, including a secondary cylinder 7 and a second driving assembly for driving the secondary cylinder 7 to translate relative to the substrate 1. A slide rail 4 is fixedly disposed on the substrate 1, a translation seat 5 is slidably disposed on the slide rail 4, and two second bearing seats 6 are fixedly disposed at both ends of the top side of the translation seat 5. The secondary cylinder 7 is rotatably mounted between the two second bearing seats 6. The second driving assembly includes at least one first pneumatic cylinder 18, whose cylinder body is fixedly disposed on the substrate 1, and whose telescopic end is connected to the translation seat 5. The first pneumatic cylinder 18 drives the translation seat 5 to translate along the slide rail 4, causing the secondary cylinder 7 to move closer to the substrate 1. The slide rail 4 provides precise linear motion guidance for the translation seat 5 by being close to or far from the main cylinder 3, facilitating the engagement and disengagement of the ring tooth 21 with the main outer ring tooth 13. Two second bearing seats 6 are symmetrically installed at both ends of the top side of the translation seat 5, providing stable end support for the auxiliary cylinder 7 and ensuring the smooth operation of the auxiliary cylinder 7 under high-speed rotation. Multiple auxiliary grinding units can be set on the circumferential outer side of the main cylinder 3. Each auxiliary cylinder 7 is connected to the main cylinder 3 through its own transmission unit and can independently adjust its own speed ratio to realize the separate processing of different materials, significantly improving the processing capacity and material adaptability range of the device.

[0023] The transmission unit connects the main cylinder 3 and the auxiliary cylinder 7, configured to drive the auxiliary cylinder 7 to rotate synchronously when the main cylinder 3 rotates, and has a variable transmission ratio. The main outer ring tooth 13 is fixedly mounted on the end of the main cylinder 3, and the translation ring cover 20 is axially slidably mounted on the end of the auxiliary cylinder 7. Multiple slave ring teeth 21 are mounted on the outside of the translation ring cover 20 and have different numbers of teeth. The axial movement mechanism is connected to the translation ring cover 20, driving it to move axially so that any slave ring tooth 21 selectively engages with the main outer ring tooth 13. The moving mechanism includes a rotating ring 23 rotatably connected to the end of the translation ring cover 20, and at least one second pneumatic cylinder 22. The cylinder body is fixedly mounted to the second bearing seat 6, and its telescopic end is connected to the rotating ring 23. A ring seat 19 is fixedly mounted on the outer side of the end of the auxiliary cylinder 7. The translation ring cover 20 is slidably sleeved on the outer side of the ring seat 19. Multiple guide grooves are circumferentially formed on the outer wall of the ring seat 19. A guide rail that slides into the guide grooves is provided on the inner wall of the translation ring cover 20. The translation ring cover 20 is driven to move axially by the second pneumatic cylinder 22. Different numbers of teeth on the driven ring teeth 21 mesh with the main outer ring teeth 13, changing the transmission ratio and thus independently adjusting the speed ratio between the secondary cylinder 7 and the main cylinder 3 to suit the grinding requirements of different materials. Operators can select the appropriate driven ring teeth 21 based on the grindability of the material inside the secondary cylinder 7, allowing the secondary cylinder 7 to operate at an optimized speed. For high-hardness materials, a speed-increasing transmission is selected to increase impact force; for low-hardness materials, a speed-reducing transmission is selected to avoid over-grinding, increasing grinding efficiency by 30%. The rotating ring 23 and the translational ring cover 20 are located at their ends. The rotating connection ensures that the secondary cylinder 7 can still rotate freely when the translation ring cover 20 moves axially, and the switching process is smooth and impact-free. The guide groove on the outer wall of the ring seat 19 slides with the guide rail on the inner wall of the translation ring cover 20, providing precise axial guidance for the translation ring cover 20 and ensuring the meshing accuracy of the driven ring tooth 21 and the main outer ring tooth 13. The translation ring cover 20 is fixedly connected to the secondary cylinder 7 through the ring seat 19. When the main cylinder 3 rotates, it reliably drives the secondary cylinder 7 to rotate synchronously through the meshing transmission of the main outer ring tooth 13 and the driven ring tooth 21.

[0024] The grading and screening unit is located inside the main cylinder 3 and the auxiliary cylinder 7. It includes multiple movable discharge grates 10 and a fixed discharge grates 11 arranged sequentially along the material conveying direction, dividing the interior of the cylinder into multiple ball mill chambers 12. Both the movable discharge grates 10 and the fixed discharge grates 11 are provided with discharge troughs 26, the diameter of which gradually decreases from the inlet end to the outlet end along the material conveying direction. The device also includes at least one third pneumatic cylinder 25, whose cylinder body is installed inside the main cylinder 3 or the auxiliary cylinder 7. Its telescopic end is connected to the movable discharge grates 10 for driving the movable discharge grates 10 to move axially. The third pneumatic cylinder 25 is provided with a protective cover 24, and the movable discharge grates 10 are provided with an annular airbag 27 on the outside. As the material passes through multiple movable discharge grates 10 and fixed discharge grates 11 in sequence, multi-stage particle size classification is achieved: larger particles are intercepted in the ball mill chamber 12 at the feed end for further grinding, medium particles pass through the front grate into the intermediate ball mill chamber 12 for further grinding, and qualified fine particles are discharged through the last fixed discharge grate 11. The aperture of the discharge trough 26 gradually decreases along the conveying direction, such as 3mm for the first stage, 2mm for the second stage, and 1mm for the third stage, forming a stepped screening. The finished product has a narrow particle size distribution, improves quality stability by 40%, and reduces over-grinding rate by 50%. Multiple grates divide the inside of the cylinder into multiple ball mill chambers 12, and each chamber can be filled with different specifications of grinding media to achieve optimized configuration of grinding media. The third pneumatic cylinder 25 drives the movable discharge grate 10 to move axially, which can change the length of each ball mill chamber 12, allowing the device to quickly adapt to different material characteristics and production requirements, reducing changeover time by 70%. Before moving, the annular airbag 27 is deflated, causing it to contract and release the radial seal between the movable discharge grate 10 and the inner wall of the cylinder. A gap appears between the movable discharge grate 10 and the inner wall of the cylinder, significantly reducing friction and allowing it to move freely, preventing the grate from jamming. The third pneumatic cylinder 25 provides precise axial driving force. After the discharge grate 10 moves to the target axial position, the third pneumatic cylinder 25 stops driving and remains locked, positioning the movable discharge grate 10 in that position. After the movable discharge grate 10 moves into place, the annular airbag 27 re-inflates to fill the gap between the movable discharge grate 10 and the inner wall of the cylinder, restoring the radial seal and preventing material from leaking from the edge of the grate without sufficient grinding. The protective cover 24 is set outside the third pneumatic cylinder 25 to prevent material particles splashed during the grinding process from impacting and damaging the cylinder telescopic rod, thus extending the service life of the cylinder.

[0025] Working principle: The power output from motor 17 is reduced and amplified by reducer 16, driving shaft 14 to rotate. The rotating teeth 15 on shaft 14 mesh with the main outer ring teeth 13 at the end of main cylinder 3, causing main cylinder 3 to rotate around its own axis. Second pneumatic cylinder 22 drives rotating ring 23 and translation ring cover 20 to move axially, causing the driven ring teeth 21 with a specific number of teeth on translation ring cover 20 to mesh with the main outer ring teeth 13. Since translation ring cover 20 is fixedly connected to auxiliary cylinder 7 via ring seat 19, when main cylinder 3 rotates, the meshing of the main outer ring teeth 13 and driven ring teeth 21 drives... The auxiliary cylinder 7 rotates synchronously. Different driven ring teeth 21 have different numbers of teeth. By selecting different driven ring teeth 21 to mesh with the main outer ring teeth 13, the transmission ratio can be changed, thereby adjusting the speed ratio between the auxiliary cylinder 7 and the main cylinder 3. The operator selects the appropriate driven ring teeth 21 according to the wear-prone characteristics of the material in the auxiliary cylinder 7, so that the auxiliary cylinder 7 runs at an optimized speed. The first pneumatic cylinder 18 can drive the translation seat 5 to translate along the slide rail 4, so that the auxiliary cylinder 7 moves closer to or away from the main cylinder 3, which facilitates the meshing and disengagement of the driven ring teeth 21 and the main outer ring teeth 13. The clinker enters the main cylinder through the screw feeder 8. The gypsum material enters the auxiliary cylinder 7 via the spiral feed cylinder 8 in the cylinder 3. Inside the ball mill chamber 12, the material rotates with the cylinder, colliding and grinding with the grinding media, gradually being pulverized. The ground material moves towards the discharge end under the action of airflow and centrifugal force, passing sequentially through multiple movable discharge grates 10 and fixed discharge grates 11. Because the aperture of the discharge trough 26 gradually decreases along the conveying direction, multi-stage particle size classification is achieved. Larger particles are intercepted in the ball mill chamber 12 at the feed end for further grinding, while medium-sized particles pass through the front grate into the intermediate ball mill chamber 12 for further grinding, resulting in qualified fine particles. The particles pass through the last stage fixed discharge grate 11 and are discharged from the cylinder through the spiral discharge cylinder 9. When it is necessary to adjust the axial position of the movable discharge grate 10 to change the length of the ball mill chamber 12, the annular airbag 27 is first deflated. The annular airbag 27 contracts, releasing the radial seal between the movable discharge grate 10 and the inner wall of the cylinder. A gap appears between the movable discharge grate 10 and the inner wall of the cylinder, the friction is greatly reduced, and it is in a freely movable state. The third pneumatic cylinder 25 is activated, and its telescopic end extends or retracts, driving the movable discharge grate 10 to move axially to the target position. The third pneumatic cylinder 25 provides axial driving force. When the movable discharge grate 10 moves to the target axial position, the third pneumatic cylinder 25 stops driving and remains locked, positioning the movable discharge grate 10 at that position. The annular airbag 27 is re-inflated and expands again, filling the gap between the movable discharge grate 10 and the inner wall of the cylinder, restoring the radial seal, and the device can be put back into normal operation. When multiple materials need to be processed or the processing capacity needs to be increased, multiple auxiliary grinding units are set on the circumferential outer side of the main cylinder 3. Each auxiliary cylinder 7 is connected to the main cylinder 3 through its own transmission unit, and each auxiliary cylinder 7 can independently adjust its own speed ratio by selecting different numbers of teeth on the auxiliary ring teeth 21 to achieve separate processing of different materials.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for pulverizing expansion agent raw materials with particle size classification function, characterized in that, include: The main grinding unit is disposed on the substrate (1). The main grinding unit includes a main cylinder (3) and a first driving component for driving the main cylinder (3) to rotate. At least one grinding unit is disposed on the substrate (1) and located on the circumferential outer side of the main cylinder (3). The secondary grinding unit includes a secondary cylinder (7) and a second driving component for driving the secondary cylinder (7) to translate relative to the substrate (1). A transmission unit connects the main cylinder (3) and the auxiliary cylinder (7), and is configured to drive the auxiliary cylinder (7) to rotate synchronously when the main cylinder (3) rotates. The transmission unit has a variable transmission ratio to adjust the speed ratio between the auxiliary grinding unit and the main grinding unit. The grading and screening unit is located inside the main cylinder (3) and the auxiliary cylinder (7). The grading and screening unit includes multiple movable discharge grates (10) and a fixed discharge grates (11) arranged sequentially along the material conveying direction, which divide the inside of the cylinder into multiple ball mill chambers (12).

2. The expanding agent raw material pulverizing device with particle size classification function according to claim 1, characterized in that, The main grinding unit includes: Main cylinder (3); Two first bearing seats (2) are installed at both ends of the top side of the base plate (1), and the main cylinder (3) is rotatably installed between the two first bearing seats (2).

3. The expanding agent raw material pulverizing device with particle size classification function according to claim 2, characterized in that, The first driving component includes: Motor (17); The speed reducer (16) has its input end connected to the output end of the motor (17); A rotating shaft (14) is rotatably disposed between the first bearing seats (2) and connected to the output end of the reducer (16); Rotary teeth (15) are fixedly mounted on the rotating shaft (14) and mesh with the main outer ring teeth (13).

4. The expanding agent raw material pulverizing device with particle size classification function according to claim 3, characterized in that, The secondary grinding unit also includes: The slide rail (4) is fixedly mounted on the base plate (1); The translation seat (5) is slidably mounted on the slide rail (4); Two second bearing seats (6) are fixedly disposed at both ends of the top side of the translation seat (5), and the auxiliary cylinder (7) is rotatably installed between the two second bearing seats (6).

5. The expanding agent raw material pulverizing device with particle size classification function according to claim 4, characterized in that, The second drive assembly includes at least one first pneumatic cylinder (18), whose cylinder body is fixedly disposed on the base plate (1), and whose telescopic end is connected to the translation seat (5).

6. The expanding agent raw material pulverizing device with particle size classification function according to claim 5, characterized in that, The transmission unit includes: The main outer ring tooth (13) is fixedly disposed at the end of the main cylinder (3); A translation ring cover (20) is axially slidably disposed at the end of the secondary cylinder (7); Multiple auxiliary ring teeth (21) are disposed on the outside of the translation ring cover (20), and each auxiliary ring tooth (21) has a different number of teeth; An axial movement mechanism, connected to the translation ring cover (20), is configured to drive the translation ring cover (20) to move axially, such that any one of the plurality of secondary ring teeth (21) selectively engages with the primary outer ring tooth (13).

7. The expanding agent raw material pulverizing device with particle size classification function according to claim 6, characterized in that, The axial movement mechanism includes: The rotating ring (23) is rotatably connected to the end of the translation ring cover (20); At least one second pneumatic cylinder (22) has its cylinder body fixedly installed with the second bearing seat (6), and its telescopic end is connected to the rotating ring (23) for driving the rotating ring (23) and the translation ring cover (20) to move axially; A ring seat (19) is fixedly provided on the outer side of the end of the secondary cylinder (7), and the translation ring cover (20) is slidably sleeved on the outer side of the ring seat (19). The outer wall of the ring seat (19) is provided with a plurality of guide grooves along the circumferential direction, and the inner wall of the translation ring cover (20) is provided with a guide rail that slides with the guide grooves.

8. The expanding agent raw material pulverizing device with particle size classification function according to claim 7, characterized in that, Both the movable discharge grate (10) and the fixed discharge grate (11) are provided with discharge troughs (26), and the aperture of the discharge troughs (26) gradually decreases from the feed end to the discharge end along the material conveying direction.

9. A puffing agent raw material pulverizing device with particle size classification function according to claim 8, characterized in that, It also includes at least one third pneumatic cylinder (25), whose cylinder body is installed inside the main cylinder (3) or the auxiliary cylinder (7), and whose telescopic end is connected to the movable discharge grate (10) for driving the movable discharge grate (10) to move axially. The third pneumatic cylinder (25) is provided with a protective cover (24), and the movable discharge grate (10) is provided with an annular airbag (27) on the outside.

10. The operating method of the expanding agent raw material pulverizing device with particle size classification function according to claim 9, characterized in that, The specific operational steps of this working method are as follows: The power output by the motor (17) is reduced and increased in torque by the reducer (16), which drives the rotating shaft (14) to rotate. The rotating teeth (15) on the rotating shaft (14) mesh with the main outer ring teeth (13) at the end of the main cylinder (3), causing the main cylinder (3) to rotate around its own axis. The second pneumatic cylinder (22) drives the rotating ring (23) and the translation ring cover (20) to move axially, so that the slave ring teeth (21) with a specific number of teeth on the translation ring cover (20) mesh with the main outer ring teeth (13). Since the translation ring cover (20) is fixedly connected to the auxiliary cylinder (7) through the ring seat (19), when the main cylinder (3) rotates, the main outer ring teeth (13) and the slave ring teeth (21) mesh with each other. The meshing transmission of the auxiliary cylinder (7) drives the auxiliary cylinder (7) to rotate synchronously. Different driven ring teeth (21) have different numbers of teeth. By selecting different driven ring teeth (21) to mesh with the main outer ring teeth (13), the transmission ratio can be changed, thereby adjusting the speed ratio between the auxiliary cylinder (7) and the main cylinder (3). According to the wear-prone characteristics of the material in the auxiliary cylinder (7), the operator selects the appropriate driven ring teeth (21) so that the auxiliary cylinder (7) runs at an optimized speed. The first pneumatic cylinder (18) can drive the translation seat (5) to translate along the slide rail (4) so ​​that the auxiliary cylinder (7) moves closer to or further away from the main cylinder (3), which facilitates the meshing and disengagement of the driven ring teeth (21) and the main outer ring teeth (13). Clinker enters the main cylinder (3) through the spiral feeder (8), and gypsum enters the auxiliary cylinder (7) through the spiral feeder (8). The material rotates with the cylinder in the ball mill chamber (12), collides and grinds with the grinding media, and is gradually crushed. The ground material moves towards the discharge end under the action of airflow and centrifugal force. The material passes through multiple movable discharge grates (10) and fixed discharge grates (11) in sequence. Since the aperture of the discharge trough (26) gradually decreases along the conveying direction, multi-level particle size classification is realized. Larger particles are intercepted in the ball mill chamber (12) at the feed end for further grinding. Medium particles enter the intermediate ball mill chamber (12) through the front grate for further grinding. Qualified fine particles pass through the last fixed discharge grate (11) and are discharged from the cylinder through the spiral discharge cylinder (9). When it is necessary to adjust the axial position of the movable discharge grate (10) to change the length of the ball mill chamber (12), firstly, the annular airbag (27) is deflated. The annular airbag (27) contracts, releasing the radial seal between the movable discharge grate (10) and the inner wall of the cylinder. A gap appears between the movable discharge grate (10) and the inner wall of the cylinder, significantly reducing friction and allowing it to move freely. The third pneumatic cylinder (25) is activated, extending or retracting its telescopic end, driving the movable discharge grate (10) to move freely. 10) Move along the axial direction to the target position. The third pneumatic cylinder (25) provides axial driving force. When the movable discharge grate (10) moves to the target axial position, the third pneumatic cylinder (25) stops driving and remains locked, positioning the movable discharge grate (10) in that position. The annular airbag (27) is re-inflated and expands again, filling the gap between the movable discharge grate (10) and the inner wall of the cylinder, restoring the radial seal, and the device can be put back into normal operation. When multiple materials need to be processed or the processing capacity needs to be increased, multiple auxiliary grinding units are set on the circumferential outer side of the main cylinder (3). Each auxiliary cylinder (7) is connected to the main cylinder (3) through its own transmission unit. Each auxiliary cylinder (7) can independently adjust its own speed ratio by selecting different numbers of teeth on the ring teeth (21) to achieve separate processing of different materials.

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