Mechanical and pneumatic combined pulverizing device
By combining mechanical and airflow pulverization devices, which integrate crushing and airflow milling, the problems of high energy consumption and low efficiency in existing technologies have been solved, achieving efficient fine pulverization and low-energy ultrafine powder preparation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XICHANG YONGAN IND & TRADE CO LTD
- Filing Date
- 2025-02-26
- Publication Date
- 2026-06-23
AI Technical Summary
Existing pulverization technologies are energy-intensive and inefficient in preparing ultrafine powders, making it difficult to meet the requirements of fine processing.
The device employs a mechanical and airflow composite pulverizing system. After initial crushing by the crushing device, the device utilizes airflow for in-depth grinding in the grinding chamber. Combined with a screen tube and a negative pressure device, it achieves efficient fine pulverization, avoiding repeated grinding by the grinder.
It achieves efficient crushing of materials into small particles of a specified size, reducing energy consumption and improving processing efficiency.
Smart Images
Figure CN120022994B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of a pulverizing device, in particular to a mechanical and airflow combined pulverizing device. BACKGROUND
[0002] Powder materials are widely used in chemical industry, medicine, food, metallurgy and other fields, such as pharmaceutical preparations, pigments, catalysts, food additives, cosmetics, paints and the like. In these applications, the particle size, particle morphology and distribution of the powder have an important influence on the quality, performance and production process of the final product. In particular, the demand for ultra-fine powder (particle size less than 10 μm) is increasing, which requires the pulverizing technology to continuously improve the pulverizing efficiency and fineness to meet the more precise processing requirements.
[0003] At present, the main method for preparing powder is mechanical pulverizing, that is, repeatedly crushing and grinding the material by a grinding or crushing device to pulverize the material into the required particle size. For ultra-fine powder, it usually needs to be processed repeatedly for a long time, which not only consumes a lot of energy, but also takes a long time and has low processing efficiency. Therefore, a more efficient and low-energy pulverizing device can be designed. SUMMARY
[0004] The purpose of the present application is to provide a mechanical and airflow combined pulverizing device which can efficiently pulverize the material into fine powder.
[0005] The present application is implemented by the following technical scheme: The mechanical and airflow combined pulverizing device of the present application comprises a crushing device, a discharge device arranged at the discharge port of the crushing device, a grinding chamber arranged below the crushing device, a feeding device for connecting the discharge device and the grinding chamber, a screen pipe arranged at the upper end inside the grinding chamber, and a negative pressure device connected to one end of the screen pipe outside the grinding chamber; the part of the screen pipe arranged inside the grinding chamber is provided with first screen holes; the feeding device comprises a material guide pipe connected to the discharge device, a horizontal air guide pipe, an air compressor connected to the air guide pipe, and a plurality of blowing pipes arranged at the side of the air guide pipe; the side wall of the end of the material guide pipe close to the air compressor is in communication with the air guide pipe; the ends of the plurality of blowing pipes away from the air guide pipe are all arranged inside the grinding chamber.
[0006] Further, the extension lines of the axes of the parts of the plurality of blowing pipes arranged inside the grinding chamber intersect at a point.
[0007] Further, a hollow flow guide plate is arranged at the upper side inside the grinding chamber, a strip-shaped first through hole is arranged at the middle of the upper side of the flow guide plate, and a strip-shaped second through hole is arranged at the middle of the lower side of the flow guide plate; the projection of the flow guide plate on the plane perpendicular to the length direction of the air guide pipe is V-shaped; the second through hole is arranged directly above the blowing pipe.
[0008] Furthermore, the projection of the grinding chamber onto the plane perpendicular to the length direction of the air guide pipe is an inverted triangular structure.
[0009] Furthermore, a pair of screen tubes are provided, and the pair of screen tubes are respectively located on both sides of the upper end of the grinding chamber, with the length direction of the screen tubes parallel to the length direction of the air guide tube; the upper sides of the guide plate are respectively located close to the pair of screen tubes.
[0010] Furthermore, the outer wall of the screen tube is provided with a plurality of scrapers along the circumferential direction, the length direction of the scrapers being parallel to the length direction of the screen tube; it also includes a driving device for driving the screen tube to rotate; a pair of screen tubes rotate in opposite directions.
[0011] Furthermore, both ends of the screen tube are rotatably connected to the side wall of the grinding chamber; the driving device includes a driven wheel sleeved on the outer wall of the screen tube, a motor located on the outer wall of the grinding chamber, a driving wheel located on the output shaft of the motor, and a transmission belt for connecting the driving wheel and the driven wheel.
[0012] Furthermore, the discharge device includes a screw feeder horizontally disposed at the discharge port of the crushing device. The screw feeder includes a horizontally disposed discharge pipe, a screw blade rotatably disposed inside the discharge pipe, and a feed inlet opened on the upper side of the discharge pipe. The discharge port of the crushing device is connected to the feed inlet. The discharge pipe is connected to the guide pipe.
[0013] Furthermore, the discharge device also includes a discharge box covered by the lower side wall of the discharge pipe, and a plurality of connecting pipes disposed on the lower side of the discharge box; the lower side wall of the discharge pipe is provided with a plurality of second sieve holes, and the plurality of second sieve holes are disposed in the discharge box; the diameter of the second sieve holes is larger than the diameter of the first sieve holes; the lower end of the connecting pipe passes through the top wall of the grinding chamber and is disposed above the first through hole.
[0014] Furthermore, the crushing device is a double-roll crusher.
[0015] The technical solution of this invention has at least the following advantages and beneficial effects: In the mechanical and airflow composite pulverizing device of this invention, the material is fed into a crusher for initial crushing. The initially crushed granular material is then fed into the guide pipe of the feeding device through a discharge device, and then into the air guide pipe. A pneumatic compressor sends high-speed gas into the air guide pipe, where the high-speed airflow drives the material particles to move at high speed. The gas is then sprayed into the grinding chamber at high speed through a blowing pipe. In the grinding chamber, the particles collide with each other and are crushed into finer powder. The powder is carried upwards by the airflow, passes through the first sieve hole on the screen tube, and enters the screen tube. Because the screen tube is connected to a negative pressure device, the powder is not only actively sucked into the screen tube, but is also promptly removed after entering the screen tube. Large particles that are not fully crushed cannot enter the screen tube and will fall into the grinding chamber, continuing to collide and crush with the particles blown out by the blowing pipe. Thus, through the initial crushing of the crushing device and the subsequent deep grinding in the grinding chamber, the material can be effectively crushed into small particles of a specified particle size. Furthermore, it does not require repeated grinding with a grinder, thus making energy consumption more controllable. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the mechanical and airflow composite pulverizing device provided in an embodiment of the present invention;
[0017] Figure 2 A schematic diagram of the internal structure of the mechanical and airflow composite pulverizing device provided in an embodiment of the present invention;
[0018] Figure 3 A two-view structural schematic diagram of the interior of the mechanical and airflow composite pulverizing device provided in an embodiment of the present invention;
[0019] Figure 4 This is a schematic diagram of the structure of the discharge device provided in an embodiment of the present invention;
[0020] Figure 5 This is a schematic diagram of the internal structure of the discharge device provided in an embodiment of the present invention;
[0021] Figure 6 This is a schematic diagram of the structure of the sieve tube provided in an embodiment of the present invention;
[0022] Figure 7 This is a schematic diagram of the feeding device provided in an embodiment of the present invention.
[0023] Icons: 10-Crushing device, 20-Discharge device, 21-Discharge pipe, 22-Spiral blade, 23-Discharge box, 24-Second screen hole, 25-Connecting pipe, 30-Grinding chamber, 31-Screw tube, 32-Scraper, 33-Drive device, 331-Driven wheel, 332-Motor, 333-Drive wheel, 334-Transmission belt, 34-Guide plate, 35-First through hole, 36-Second through hole, 40-Feeding device, 41-Guide pipe, 42-Air guide pipe, 43-Pneumatic compressor, 44-Blowing pipe, 45-Laval pipe. Detailed Implementation
[0024] Example
[0025] The following description, in conjunction with specific embodiments, further illustrates the point, as shown in the appendix. Figure 1 - Appendix Figure 7 As shown, the mechanical and airflow combined pulverizing device of this embodiment includes a crushing device 10, a discharge device 20 located at the discharge port of the crushing device 10, a grinding chamber 30 located below the crushing device 10, a feeding device 40 for connecting the discharge device 20 and the grinding chamber 30, a screen pipe 31 located at the upper end inside the grinding chamber 30, and a negative pressure device connected to the end of the screen pipe 31 located outside the grinding chamber 30; the portion of the screen pipe 31 located inside the grinding chamber 30 has a first screen hole; the feeding device 40 includes a guide pipe 41 connected to the discharge device 20, a horizontally arranged air guide pipe 42, a pneumatic compressor 43 connected to the air guide pipe 42, and a plurality of blowing pipes 44 located on the side of the air guide pipe 42; the guide pipe 41 and the side wall of the air guide pipe 42 near the pneumatic compressor 43 are connected; the ends of the plurality of blowing pipes 44 away from the air guide pipe 42 are all located inside the grinding chamber 30. Specifically, during use, the material is fed into the crusher for initial crushing. The initially crushed granular material is then fed into the guide pipe 41 of the feeding device 40 through the discharge device 20. From there, it enters the air guide pipe 42. The air compressor 43 sends high-speed gas into the air guide pipe 42. The high-speed airflow in the air guide pipe 42 drives the material particles to move at high speed and is then sprayed into the grinding chamber 30 at high speed through the blowing pipe 44. In the grinding chamber 30, the particles collide with each other and are crushed into finer powder. The powder is carried upward by the airflow and passes through the first screen hole on the screen pipe 31 before entering the screen pipe 31. Because the screen pipe 31 is connected to a negative pressure device, the powder is not only actively sucked into the screen pipe 31, but it is also promptly removed after entering the screen pipe 31. Large particles that are not fully crushed cannot enter the screen pipe 31 and will fall into the grinding chamber 30 and continue to collide and crush with the particles blown out by the blowing pipe 44. In this way, through the initial crushing by the crushing device 10 and the subsequent in-depth grinding in the grinding chamber 30, the material can be effectively crushed into small particles of the specified particle size. Furthermore, it eliminates the need for repeated grinding with a mill, thus making energy consumption more controllable.
[0026] In this embodiment, the extended axes of the portions of the multiple blowing pipes 44 located within the grinding chamber 30 intersect at a single point. Specifically, this increases the probability of particle collision after it exits the blowing pipes 44. A Laval nozzle can be installed on the air guide pipe 42 to increase the airflow velocity, enabling it to reach sonic or supersonic speeds.
[0027] In this embodiment, a hollow guide plate 34 is provided on the upper side of the grinding chamber 30. A strip-shaped first through hole 35 is opened in the middle of the upper side of the guide plate 34, and a strip-shaped second through hole 36 is opened in the middle of the lower side of the guide plate 34. The projection of the guide plate 34 on the plane perpendicular to the length direction of the air guide pipe 42 is V-shaped. The second through hole 36 is located directly above the blowing pipe 44. Specifically, powdered material can be discharged through the screen pipe 31, while larger particles will fall above the guide plate 34, then enter the interior of the guide pipe through the first through hole 35 above the guide plate 34, and then fall back into the grinding chamber 30 through the second through hole 36 below the guide plate 34. At this time, these particles can just collide with the particles sprayed from the blowing pipe 44. The width of the second through hole 36 is only slightly larger than the diameter of the material particles, so the airflow in the grinding chamber 30 will not enter the guide plate 34 through the second through hole 36.
[0028] In this embodiment, the grinding chamber 30 is projected onto a plane perpendicular to the length direction of the air guide pipe 42 as an inverted triangle. A pair of sieve tubes 31 are provided, located on either side of the upper end of the grinding chamber 30, with the length direction of the sieve tubes 31 parallel to the length direction of the air guide pipe 42. The upper sides of the guide plate 34 are positioned close to the pair of sieve tubes 31. Specifically, the inverted triangular grinding chamber 30 and the V-shaped guide plate 34 allow particles or powder to preferentially and fully contact the sieve tubes 31. The sieved powder is discharged from the sieve tubes 31, while larger particles enter the guide plate 34 through the first through-hole 35.
[0029] In this embodiment, the outer wall of the screen tube 31 is provided with multiple scrapers 32 along the circumferential direction, and the length direction of the scrapers 32 is parallel to the length direction of the screen tube 31; it also includes a drive device 33 for driving the screen tube 31 to rotate; a pair of screen tubes 31 rotate in opposite directions. Specifically, due to the structure of the grinding chamber 30 and the guide plate 34, the airflow will fully contact the screen tube 31, and the powder can enter the screen tube 31, while large particles will remain between the scrapers 32 on the surface of the screen tube 31. During the rotation of the screen tube 31, the scrapers 32 can throw the large particles of material onto the guide plate 34, so that the large particles of material can enter the guide plate 34.
[0030] In this embodiment, both ends of the sieve tube 31 are rotatably connected to the side wall of the grinding chamber 30; the drive device 33 includes a driven wheel 331 sleeved on the outer wall of the sieve tube 31, a motor 332 disposed on the outer wall of the grinding chamber 30, a drive wheel 333 disposed on the output shaft of the motor 332, and a transmission belt 334 for connecting the drive wheel 333 and the driven wheel 331.
[0031] The discharge device 20 in this embodiment includes a screw feeder horizontally disposed at the discharge port of the crushing device 10. The screw feeder includes a horizontally disposed discharge pipe 21, a screw blade 22 rotatably disposed within the discharge pipe 21, and a feed inlet located on the upper side of the discharge pipe 21. The discharge port of the crushing device 10 is connected to the feed inlet. The discharge pipe 21 is connected to the guide pipe 41. Specifically, the material crushed by the crushing device 10 falls into the discharge pipe 21 and is conveyed to the guide pipe 41 by the screw blade 22.
[0032] The discharge device 20 in this embodiment also includes a discharge box 23 covered by the lower side wall of the discharge pipe 21, and multiple connecting pipes 25 disposed on the lower side of the discharge box 23; the lower side wall of the discharge pipe 21 is provided with multiple second screen holes 24, all of which are disposed in the discharge box 23; the diameter of the second screen holes 24 is larger than the diameter of the first screen holes; the lower end of the connecting pipe 25 passes through the top wall of the grinding chamber 30 and is disposed above the first through hole 35. Specifically, some of the granular material entering the discharge pipe 21 has a lower particle size, which can be directly discharged into the discharge box 23 through the second screen holes 24, and then directly fed into the guide plate 34 through the connecting pipe 25.
[0033] In this embodiment, the crushing device 10 is a double-roll crusher. Specifically, the crushing device 10 uses a traditional roller crusher, which is sufficient for preliminary crushing.
[0034] In summary, the mechanical and airflow combined pulverizing device of this embodiment involves feeding materials into a crusher for initial crushing. The initially crushed particles are then fed through the discharge device 20 into the feed pipe 41 of the feeding device 40, and then into the air pipe 42. The air compressor 43 delivers high-speed gas into the air pipe 42, which in turn drives the material particles to move at high speed. The gas is then sprayed into the grinding chamber 30 at high speed through the blowing pipe 44. In the grinding chamber 30, the particles collide with each other and are crushed into finer powder. The powder is carried upward by the airflow and passes through the first screen hole on the screen pipe 31 before entering the screen pipe 31. Because the screen pipe 31 is connected to a negative pressure device, the powder is not only actively sucked into the screen pipe 31, but is also promptly removed after entering the screen pipe 31. Large particles that are not fully crushed cannot enter the screen pipe 31 and will fall into the grinding chamber 30, where they will continue to collide and be crushed with the particles blown out by the blowing pipe 44. In this way, through the initial crushing by the crushing device 10 and the subsequent in-depth grinding in the grinding chamber 30, the material can be effectively crushed into small particles of the specified particle size. Furthermore, it eliminates the need for repeated grinding with a mill, thus making energy consumption more controllable.
[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A mechanical and airflow combined pulverizing device, characterized in that: It includes a crushing device (10), a discharge device (20) located at the discharge port of the crushing device (10), a grinding chamber (30) located below the crushing device (10), a feeding device (40) for connecting the discharge device (20) and the grinding chamber (30), a screen tube (31) located at the upper end inside the grinding chamber (30), and a negative pressure device connected to one end of the screen tube (31) located outside the grinding chamber (30). The sieve tube (31) located inside the grinding chamber (30) has a first sieve hole; the feeding device (40) includes a guide pipe (41) connected to the discharge device (20), a horizontally arranged air guide pipe (42), a pneumatic compressor (43) connected to the air guide pipe (42), and a plurality of blowing pipes (44) located on the side of the air guide pipe (42); the guide pipe (41) and the side wall of the air guide pipe (42) near the pneumatic compressor (43) are connected; the ends of the plurality of blowing pipes (44) away from the air guide pipe (42) are all located inside the grinding chamber (30); The extended axes of the portions of the multiple blowing pipes (44) located inside the grinding chamber (30) intersect at a single point; a hollow guide plate (34) is provided on the upper side inside the grinding chamber (30), a strip-shaped first through hole (35) is opened in the middle of the upper side of the guide plate (34), and a strip-shaped second through hole (36) is opened in the middle of the lower side of the guide plate (34); the projection of the guide plate (34) on the plane perpendicular to the length direction of the air guide pipe (42) is V-shaped; the second through hole (36) is located directly above the blowing pipe (44); the projection of the grinding chamber (30) on the plane perpendicular to the length direction of the air guide pipe (42) is an inverted triangular structure; The screen tubes (31) are provided in pairs, and the pair of screen tubes (31) are respectively located on both sides of the upper end of the grinding chamber (30). The length direction of the screen tubes (31) is parallel to the length direction of the air guide tube (42). The upper sides of the guide plate (34) are respectively located close to the pair of screen tubes (31).
2. The mechanical and airflow combined pulverizing device according to claim 1, characterized in that: The outer wall of the sieve tube (31) is provided with a plurality of scrapers (32) along the circumferential direction, and the length direction of the scrapers (32) is parallel to the length direction of the sieve tube (31); It also includes a drive device (33) for driving the screen tubes (31) to rotate; the pair of screen tubes (31) rotate in opposite directions.
3. The mechanical and airflow combined pulverizing device according to claim 2, characterized in that: Both ends of the sieve tube (31) are rotatably connected to the side wall of the grinding chamber (30); the drive device (33) includes a driven wheel (331) sleeved on the outer wall of the sieve tube (31), a motor (332) disposed on the outer wall of the grinding chamber (30), a drive wheel (333) disposed on the output shaft of the motor (332), and a transmission belt (334) for connecting the drive wheel (333) and the driven wheel (331).
4. The mechanical and airflow combined pulverizing device according to claim 1, characterized in that: The discharge device (20) includes a screw feeder horizontally disposed at the discharge port of the crushing device (10). The screw feeder includes a horizontally disposed discharge pipe (21), a screw blade (22) rotatably disposed in the discharge pipe (21), and a feed port opened on the upper side of the discharge pipe (21). The discharge port of the crushing device (10) is connected to the feed port; the discharge pipe (21) is connected to the guide pipe (41).
5. The mechanical and airflow combined pulverizing device according to claim 4, characterized in that: The discharge device (20) further includes a discharge box (23) covered on the lower side wall of the discharge pipe (21), and a plurality of connecting pipes (25) provided on the lower side of the discharge box (23); The lower side wall of the discharge pipe (21) is provided with a plurality of second sieve holes (24), and the plurality of second sieve holes (24) are all located in the discharge box (23); the diameter of the second sieve hole (24) is larger than the diameter of the first sieve hole; the lower end of the connecting pipe (25) passes through the top wall of the grinding chamber (30) and is located above the first through hole (35).
6. The mechanical and airflow combined pulverizing device according to claim 1, characterized in that: The crushing device (10) is a double-roll crusher.