Raymond mill with screening structure

Abstract

The application relates to a Raymond mill with a screening structure, which comprises a machine body, the machine body is fixedly installed on the top of a mounting rack, the bottom of the machine body is provided with an air inlet, the top of the machine body is provided with a mounting frame, one side of the mounting frame is provided with a discharge port, the inside of the machine body is provided with a grinding mechanism and a separation mechanism, the grinding mechanism comprises a first transmission shaft, a grinding assembly, a screening assembly and a first transmission assembly, a front screening assembly is additionally arranged between a grinding cavity and a top separator, powder after being crushed by a grinding roller is lifted along with airflow, a rotating screen cylinder in the screening assembly screens the powder through centrifugal action, fine powder after being screened enters the separator for further separation, and coarse powder falls back to the grinding cavity for continuous grinding, so that the load of the separator is reduced, and the abrasion of coarse material on separator blades is reduced.

Description

Technical Field

[0001] This invention relates to the field of Raymond milling equipment technology, and in particular to a Raymond mill with a screening structure. Background Technology

[0002] Raymond mill is a mainstream grinding equipment in the non-metallic mineral, chemical, and building materials industries. It relies on grinding rollers and grinding rings to crush materials, and then uses a top analyzer to separate the powder by air. It is widely used in the powder processing of materials such as calcite, talc, calcium carbonate, and plastic fillers.

[0003] However, some existing Raymond mills have certain shortcomings in use. For example, in the grinding process of some existing Raymond mills, the material is directly sent to the separator for air separation after being crushed. Due to the lack of a pre-screening process, some large particles that are not fully ground will also enter the separator with the airflow, increasing the load on the analyzer and aggravating the wear of the separator, thus affecting the separation efficiency and service life. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a Raymond mill with a sieving structure.

[0005] The Raymond mill with a screening structure provided by this invention adopts the following technical solution: A Raymond mill with a screening structure includes a body, which is fixedly mounted on the top of a mounting frame. An air inlet is located at the bottom of the body, and a mounting frame is mounted on the top of the body. A discharge port is located on one side of the mounting frame. The body contains a grinding mechanism and a separation mechanism. The grinding mechanism includes a first drive shaft, a grinding assembly, a screening assembly, and a first transmission assembly. The first drive shaft is rotatably mounted inside the body. The grinding assembly is mounted on the first drive shaft, and the screening assembly is mounted on top of the first drive shaft. The screening assembly includes a rotating screen cylinder and a cleaning component. Screen holes are formed on the outer wall of the rotating screen cylinder. The top of the rotating screen cylinder rotates to the center of an annular seat located on the inner wall of the body. A first gear ring is fixedly mounted on the bottom of the rotating screen cylinder. The first transmission assembly is mounted on the bottom of the mounting frame and is connected to the first drive shaft.

[0006] Preferably, the cleaning component includes a plurality of gears distributed circumferentially on the outer side of the rotating screen cylinder. The gears mesh with the first gear ring, and each gear is equipped with a shaft. The shaft is rotatably installed in a shaft hole in a support plate provided on the inner wall of the machine body. An installation sleeve is also fitted on the shaft. A plurality of cleaning brushes are fixedly installed on the outer wall of the installation sleeve, and the ends of the cleaning brushes elastically abut against the outer wall of the rotating screen cylinder.

[0007] Preferably, the grinding assembly is equipped with a scraping component. The grinding assembly includes a perforated frame fixedly mounted on a first drive shaft. Each end of the perforated frame has a movable groove. A connecting roller is installed inside each movable groove. The connecting roller is rotatably mounted inside the movable groove via a short shaft on one side. A grinding roller is fixedly mounted at the bottom of each connecting roller. The outer circumferential surface of the grinding roller is in contact with the inner wall of the grinding ring provided on the inner wall of the grinding chamber of the machine body. The scraping component includes a turntable fixedly mounted on the first drive shaft. Several scrapers are evenly distributed around the circumference of the turntable. The bottom end of the scraper is in contact with the bottom wall of the grinding chamber at the bottom of the machine body.

[0008] Preferably, the first transmission assembly includes a first driven wheel disposed at the bottom of the mounting frame, the first driven wheel being fixedly mounted at the bottom of the first transmission shaft, and a first drive motor being fixedly mounted at the top of the mounting frame. The output shaft of the first drive motor passes through the mounting frame and is connected to a first driving wheel. The first driving wheel and the first driven wheel are connected by a first transmission belt.

[0009] Preferably, the separation mechanism includes a separator located at the top of the machine body, a connecting shaft fixedly connected to the separator, and the connecting shaft rotatably residing in a shaft hole on a support frame located within an opening at the top of the machine body. The separation mechanism includes a second transmission component and a pushing component. The second transmission component is installed at the top of the machine body and drives the separator to rotate to separate the sieved powder. The pushing component is installed on the outer wall of the separator and is used to push off the powder adhering to the separator.

[0010] Preferably, the actuating assembly includes a second toothed ring fixedly installed on the outer wall of the separator, a toothed ring provided on the outer side of the second toothed ring, a toothed groove provided on the inner wall of the toothed ring meshing with the teeth on the second toothed ring, the toothed ring being rotatably installed in an annular frame provided at the top of the body, a lever fixedly connected to the bottom of the toothed ring, and an elastic sheet fixedly connected to the inner wall of the body, one end of the elastic sheet being in contact with the outer wall of the separator.

[0011] Preferably, the second transmission assembly includes a second transmission shaft rotatably mounted in a shaft hole on the mounting frame at the top of the machine body. One end of the second transmission shaft passes through the interior of the mounting frame and is connected to one end of a connecting shaft fixedly connected to the separator. The other end of the second transmission shaft extends to the outside of the mounting frame and is fixedly connected to a second driven wheel. A second drive motor is fixedly mounted at the bottom of a motor support seat provided at the top of the machine body. The output shaft of the second drive motor passes through the motor support seat and is fixedly mounted to a second driving wheel. The second driving wheel and the second driven wheel are connected by a second transmission belt.

[0012] In summary, the present invention has the following beneficial technical effects: This invention adds a pre-screening component between the grinding chamber and the top separator. The powder, after being crushed by the grinding rollers, rises with the airflow. The rotating screen cylinder in the screening component screens the powder through centrifugal force. The fine powder after screening enters the separator for further separation, while the coarse powder falls back into the grinding chamber for further grinding. This reduces the load on the separator and reduces the wear of the separator blades by coarse material. At the same time, during the rotation of the rotating screen cylinder, the first gear ring at the bottom of the rotating screen cylinder meshes and drives the outer gear, shaft, and cleaning brush to rotate in the opposite direction. This allows the cleaning brush to continuously clean the outer wall of the rotating screen cylinder, preventing the screen holes from clogging and improving the screening efficiency.

[0013] This invention includes a separation mechanism comprising a toggle assembly and a second transmission assembly. The second transmission assembly drives the separator to rotate, separating the sieved powder. Simultaneously, the toothed ring in the toggle assembly drives the lever to rotate under the meshing drive of the second toothed ring. During rotation, the lever continuously agitates the elastic sheet, causing it to vibrate and dislodging the powder adhering to the outer wall of the separator. This prevents the powder from clogging the separator's sieve holes, thereby improving the separator's sieving efficiency and flow.

[0014] This invention provides a grinding mechanism, which includes a grinding component, a sieving component, and a first transmission component. The first transmission component drives the first transmission shaft to rotate, enabling the first transmission shaft to drive the grinding roller to grind the material and the rotating sieve cylinder to sieve the powder simultaneously, thereby achieving simultaneous grinding and sieving of the material and improving work efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a Raymond mill with a sieving structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the first transmission component in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the internal structure of the machine body in an embodiment of the present invention; Figure 4 This is an assembly diagram of the rotary screen cylinder and grinding assembly in an embodiment of the present invention; Figure 5 This is a schematic diagram of the grinding component structure in an embodiment of the present invention; Figure 6 This is an embodiment of the present invention. Figure 4 Enlarged view of the structure at point A in the middle; Figure 7 This is a schematic diagram of the assembly of the second transmission component and the separator in an embodiment of the present invention; Figure 8 This is a schematic diagram of the separator outer wall actuation assembly structure in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached drawings: 1. Machine body; 2. Mounting bracket; 3. First drive shaft; 4. Peripheral frame; 5. Movable groove; 6. Short shaft; 7. Connecting roller; 8. Grinding roller; 9. Turntable; 10. Scraper; 11. Grinding ring; 12. Rotary screen cylinder; 13. First gear ring; 14. Shaft; 15. Support plate; 16. Gear; 17. Mounting sleeve; 18. Cleaning brush; 19. First driven wheel; 20. First transmission belt; 21. First drive motor ; 22. First drive wheel; 23. Mounting frame; 24. Connecting shaft; 25. Support frame; 26. Separator; 27. Second transmission shaft; 28. Second driven wheel; 29. ​​Second transmission belt; 30. Second drive wheel; 31. Second drive motor; 32. Motor support seat; 33. Second gear ring; 34. Gear ring; 35. Ring frame; 36. Lever; 37. Elastic sheet; 38. Air inlet; 39. Discharge outlet; 40. Ring seat. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 —8. The present invention will be described in further detail.

[0018] This invention discloses a Raymond mill with a screening structure, comprising a body 1, which is fixedly mounted on the top of a mounting frame 2. An air inlet 38 is provided at the bottom of the body 1, and a mounting frame 23 is mounted on the top of the body 1. A discharge port 39 is provided on one side of the mounting frame 23. A grinding mechanism and a separation mechanism are provided inside the body 1. The grinding mechanism includes a first drive shaft 3, a grinding assembly, a screening assembly, and a first transmission assembly. The first drive shaft 3 is rotatably mounted inside the body 1. The grinding assembly is mounted on the first drive shaft 3, and the screening assembly is mounted on the top of the first drive shaft 3. The screening assembly includes a rotating screen cylinder 12 and a cleaning component. Screen holes are provided on the outer wall of the rotating screen cylinder 12. The top of the rotating screen cylinder 12 rotates to the middle position of an annular seat 40 provided on the inner wall of the body 1. A first gear ring 13 is also fixedly mounted on the bottom of the rotating screen cylinder 12. The first transmission assembly is mounted on the bottom of the mounting frame 2 and is connected to the first drive shaft 3.

[0019] refer to Figure 4 and Figure 6The cleaning components include several gears 16 distributed around the outer circumference of the rotating screen cylinder 12. Each gear 16 meshes with a first gear ring 13, and each gear 16 is equipped with a shaft 14. The shaft 14 is rotatably installed in the shaft hole of the support plate 15 on the inner wall of the machine body 1. The shaft 14 is also fitted with a mounting sleeve 17. Several cleaning brushes 18 are fixedly installed on the outer wall of the mounting sleeve 17. The ends of the cleaning brushes 18 elastically abut against the outer wall of the rotating screen cylinder 12. More specifically, during operation, the first drive shaft 3 drives the rotating screen cylinder 12 to rotate. The first gear ring 13 located at the bottom of the outer wall of the rotating screen cylinder 12 meshes with and drives the surrounding gears 16 to rotate, causing the shaft 14 to rotate in the shaft hole of the support plate 15, and driving the cleaning brushes 18 to rotate and reciprocate to scrape the outer wall of the rotating screen cylinder 12, removing the powder clogging the screen holes and improving the screening efficiency.

[0020] refer to Figure 5 The grinding assembly includes a scraping component. The grinding assembly comprises a perforated frame 4 fixedly mounted on the first drive shaft 3. Each end of the perforated frame 4 has a movable groove 5. Connecting rollers 7 are installed inside the movable grooves 5, and the connecting rollers 7 are rotatably mounted inside the movable grooves 5 via a short shaft 6 on one side. Grinding rollers 8 are fixedly mounted at the bottom of the connecting rollers 7. The outer circumference of the grinding rollers 8 is in contact with the inner wall of the grinding ring 11 provided on the inner wall of the grinding chamber of the machine body 1. The scraping component includes a turntable fixedly mounted on the first drive shaft 3. 9. Several scrapers 10 are evenly distributed around the circumference of the turntable 9. The bottom end of the scraper 10 is in contact with the bottom wall of the grinding chamber inside the machine body 1. More specifically, during operation, the first drive shaft 3 drives the flower frame 4 and the turntable 9 to rotate synchronously. The flower frame 4 drives the connecting roller 7 and the grinding roller 8 to rotate along the inner wall of the grinding ring 11 to crush and grind the material. The turntable 9 drives the scraper 10 to rotate, scraping up the powder accumulated on the bottom wall of the grinding chamber and pushing it between the grinding roller 8 and the grinding ring 11 to avoid material accumulation and compaction, thereby improving grinding efficiency.

[0021] refer to Figure 3 The first transmission assembly includes a first driven wheel 19 disposed at the bottom of the mounting frame 2. The first driven wheel 19 is fixedly mounted at the bottom of the first transmission shaft 3. A first drive motor 21 is also fixedly mounted at the top of the mounting frame 2. The output shaft of the first drive motor 21 passes through the mounting frame 2 and is connected to a first drive wheel 22. The first drive wheel 22 and the first driven wheel 19 are connected by a first transmission belt 20. More specifically, during operation, the first drive motor 21 starts and drives the first drive wheel 22 to rotate, which in turn drives the first driven wheel 19 to rotate through the first transmission belt 20, thereby driving the first transmission shaft 3 to rotate. This enables the first transmission shaft 3 to drive the grinding assembly and the screening assembly to work synchronously, achieving synchronous grinding and screening of materials and improving work efficiency.

[0022] refer to Figure 3 and Figure 7The separation mechanism includes a separator 26 located at the top of the machine body 1. A connecting shaft 24 is fixedly connected to the separator 26. The connecting shaft 24 rotates within a shaft hole on a support frame 25 located within an opening at the top of the machine body 1. The separation mechanism includes a second transmission assembly and a pushing assembly. The second transmission assembly is installed at the top of the machine body 1 and drives the separator 26 to rotate and separate the sieved powder. The pushing assembly is installed on the outer wall of the separator 26 and is used to remove powder adhering to the separator 26. The pushing assembly includes a second toothed ring 33 fixedly installed on the outer wall of the separator 26. A toothed ring 34 is provided on the outer side of the second toothed ring 33. The toothed grooves on the inner wall of the toothed ring 34 mesh with the teeth on the second toothed ring 33. The toothed ring 34 is rotatably installed in the annular frame 35 set at the top of the machine body 1. The bottom of the toothed ring 34 is also fixedly connected to the lever 36. An elastic sheet 37 is also fixedly connected to the inner wall of the machine body 1. One end of the elastic sheet 37 is in contact with the outer wall of the separator 26. More specifically, during operation, when the second transmission component drives the separator 26 to rotate, the second toothed ring 33 drives the toothed ring 34 to rotate synchronously along the annular frame 35. The toothed ring 34 drives the lever 36 to rotate. During the rotation, the lever 36 continuously pushes the elastic sheet 37 fixedly connected to the inner wall of the machine body 1, causing the elastic sheet 37 to vibrate and shake off the powder adhering to the outer wall of the separator 26, avoiding the powder from clogging the sieve holes of the separator 26 and improving the screening efficiency and smoothness of the separator 26.

[0023] refer to Figure 8 The second transmission assembly includes a second transmission shaft 27 rotatably mounted in a shaft hole on the mounting frame 23 at the top of the machine body 1. One end of the second transmission shaft 27 passes through the interior of the mounting frame 23 and is connected to one end of the connecting shaft 24 fixedly connected to the separator 26. The other end of the second transmission shaft 27 extends to the outside of the mounting frame 23 and is fixedly connected to a second driven wheel 28. A second drive motor 31 is fixedly mounted at the bottom of a motor support 32 at the top of the machine body 1. The output shaft of the second drive motor 31 passes through the motor support 32 and is fixedly mounted to a second driving wheel 30. The second driving wheel 30 and the second driven wheel 28 are connected by a second transmission belt 29. More specifically, during operation, the second drive motor 31 starts, driving the second driving wheel 30 to rotate, which in turn drives the second driven wheel 28 to rotate via the second transmission belt 29. The second transmission shaft 27 rotates accordingly, thereby driving the connecting shaft 24 and the separator 26 to rotate, thus achieving stable driving of the separator 26.

[0024] The implementation principle of a Raymond mill with a sieving structure according to an embodiment of the present invention is as follows: During use, the material to be ground is fed into the machine body 1 through the feed inlet on the outer wall of the machine body 1. The first drive motor 21 is started, and the first drive shaft 3 is rotated through the action of the first drive wheel 22, the first transmission belt 20, and the first driven wheel 19. The first drive shaft 3 drives the flower frame 4 and the turntable 9 to rotate synchronously. The flower frame 4 drives the grinding roller 8 to rotate along the inner wall of the grinding ring 11, crushing and grinding the material. The turntable 9 drives the scraper 10 to rotate, scraping up the powder accumulated on the bottom wall of the grinding chamber and pushing it between the grinding roller 8 and the grinding ring 11 to prevent material accumulation and compaction. At the same time, the first drive shaft 3 drives the rotating screen cylinder 12 to rotate. The material generated during the grinding process is conveyed upwards through the airflow entering through the air inlet 38 at the bottom of the machine body 1. After preliminary sieving by the rotating screen cylinder 12, coarser particles are intercepted by the rotating screen cylinder 12 and fall back into the grinding chamber for further grinding, while finer powder enters the grading zone through the sieve holes of the rotating screen cylinder 12. The first gear ring 13, located at the bottom of the outer wall of the rotating screen cylinder 12, meshes with and drives the surrounding gears 16 to rotate. This causes the shaft 14 to drive the cleaning brush 18 to rotate and reciprocate to scrape the outer wall of the rotating screen cylinder 12, removing powder clogging the screen holes. Simultaneously, the second drive motor 31 starts, driving the second drive shaft 27 to rotate via the second drive wheel 30, the second transmission belt 29, and the second driven wheel 28. This, in turn, drives the separator 26 to rotate, performing secondary classification on the powder entering the classification zone, separating powder that meets the fineness requirements. The material is discharged from the outlet 39, while the coarse powder that does not meet the requirements is thrown back to the rotating screen cylinder 12 by the separator 26. When the separator 26 rotates, the second toothed ring 33 drives the toothed ring 34 to rotate synchronously along the ring frame 35. The toothed ring 34 drives the lever 36 to continuously push the elastic plate 37 fixedly connected to the inner wall of the motor body 1 during the rotation, so that the elastic plate 37 vibrates and shakes off the powder adhering to the outer wall of the separator 26, so as to avoid the powder clogging the screen holes of the separator 26 and improve the screening efficiency and smoothness of the separator 26.

[0025] The above are all 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 Raymond mill with a screening structure, comprising a body (1), the body (1) being fixedly mounted on the top of a mounting frame (2), an air inlet (38) being provided at the bottom of the body (1), a mounting frame (23) being mounted on the top of the body (1), and a discharge port (39) being provided on one side of the mounting frame (23), characterized in that: The machine body (1) is equipped with a grinding mechanism and a separation mechanism. The grinding mechanism includes a first drive shaft (3), a grinding component, a sieving component and a first transmission component. The first drive shaft (3) is rotatably installed inside the machine body (1). The grinding component is installed on the first drive shaft (3). The sieving component is installed on the top of the first drive shaft (3). The sieving component includes a rotating screen cylinder (12) and a cleaning component. The outer wall of the rotating screen cylinder (12) is provided with screen holes. The top of the rotating screen cylinder (12) is rotated at the middle position of the annular seat (40) provided on the inner wall of the machine body (1). The bottom of the rotating screen cylinder (12) is also fixedly installed with a first gear ring (13). The first transmission component is installed at the bottom of the mounting frame (2) and is connected to the first drive shaft (3) for transmission.

2. The Raymond mill with a screening structure according to claim 1, characterized in that: The cleaning component includes several gears (16) distributed around the outer circumference of the rotating screen cylinder (12). The gears (16) mesh with the first gear ring (13) respectively, and each gear (16) is equipped with a shaft (14). The shaft (14) is rotatably installed in the shaft hole of the support plate (15) provided on the inner wall of the machine body (1). The shaft (14) is also fitted with an installation sleeve (17). Several cleaning brushes (18) are fixedly installed on the outer wall of the installation sleeve (17). The end of the cleaning brush (18) elastically abuts against the outer wall of the rotating screen cylinder (12).

3. A Raymond mill with a screening structure according to claim 1, characterized in that: The grinding assembly is equipped with a scraping component. The grinding assembly includes a plum blossom frame (4) fixedly installed on the first drive shaft (3). The ends of the plum blossom frame (4) are all opened with movable grooves (5). Connecting rollers (7) are installed inside the movable grooves (5). The connecting rollers (7) are rotatably installed inside the movable grooves (5) through a short shaft (6) set on one side. Grinding rollers (8) are fixedly installed at the bottom of the connecting rollers (7). The outer circumferential surface of the grinding rollers (8) is in contact with the inner wall of the grinding ring (11) set on the inner wall of the grinding chamber of the machine body (1). The scraping component includes a turntable (9) fixedly installed on the first drive shaft (3). Several scrapers (10) are evenly distributed on the circumference of the turntable (9). The bottom end of the scraper (10) is in contact with the bottom wall of the grinding chamber at the bottom of the machine body (1).

4. A Raymond mill with a screening structure according to claim 1, characterized in that: The first transmission assembly includes a first driven wheel (19) disposed at the bottom of the mounting frame (2). The first driven wheel (19) is fixedly mounted at the bottom of the first transmission shaft (3). A first drive motor (21) is also fixedly mounted at the top of the mounting frame (2). The output shaft of the first drive motor (21) passes through the mounting frame (2) and is connected to a first driving wheel (22). The first driving wheel (22) and the first driven wheel (19) are connected by a first transmission belt (20).

5. A Raymond mill with a screening structure according to claim 1, characterized in that: The separation mechanism includes a separator (26) located at the top inside the body (1). A connecting shaft (24) is fixedly connected to the separator (26). The connecting shaft (24) rotates in the shaft hole of the support frame (25) located in the top opening of the body (1). The separation mechanism is provided with a second transmission component and a pushing component. The second transmission component is installed on the top of the body (1) and drives the separator (26) to rotate to separate the sieved powder. The pushing component is installed on the outer wall of the separator (26) and is used to push off the powder adhering to the separator (26).

6. A Raymond mill with a screening structure according to claim 5, characterized in that: The actuation assembly includes a second toothed ring (33) fixedly installed on the outer wall of the separator (26). A toothed ring (34) is provided on the outer side of the second toothed ring (33). The toothed groove provided on the inner wall of the toothed ring (34) meshes with the teeth on the second toothed ring (33). The toothed ring (34) is rotatably installed in the ring frame (35) provided at the top of the body (1). A lever (36) is also fixedly connected to the bottom of the toothed ring (34). An elastic sheet (37) is also fixedly connected to the inner wall of the body (1). One end of the elastic sheet (37) is in contact with the outer wall of the separator (26).

7. A Raymond mill with a screening structure according to claim 5, characterized in that: The second transmission assembly includes a second transmission shaft (27) rotatably mounted in the shaft hole of the mounting frame (23) on the top of the body (1). One end of the second transmission shaft (27) passes through the inside of the mounting frame (23) and is connected to one end of the connecting shaft (24) fixedly connected to the separator (26). The other end of the second transmission shaft (27) extends to the outside of the mounting frame (23) and is fixedly connected to a second driven wheel (28). A second drive motor (31) is fixedly mounted at the bottom of the motor support seat (32) provided on the top of the body (1). The output shaft of the second drive motor (31) passes through the motor support seat (32) and is fixedly mounted to a second driving wheel (30). The second driving wheel (30) and the second driven wheel (28) are connected by a second transmission belt (29).

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