Grinding and crushing device of rotary fluidized bed

Abstract

The utility model discloses a grinding and crushing device of a rotary fluidized bed. Comprising a crushing cylinder body, a grading wheel arranged at the upper part in the crushing cylinder body, a discharge hole formed in the top of the crushing cylinder body and communicated with a discharge hole of the grading wheel, a gas distribution plate arranged at a lower position in the crushing cylinder body, and a grinding ball arranged at the upper end of the gas distribution plate, the central cylinder is arranged at the center of the bottom of the crushing cylinder and penetrates through the gas distribution plate, the inclined outer gas taps are arranged on the side wall of the crushing cylinder, are opposite to the gas distribution plate and are distributed in an annular array, and the inclined inner gas taps are arranged on the central cylinder and are opposite to the inclined outer gas taps. According to the grinding and smashing device of the rotating fluidized bed, the mode that ascending airflow and rotating airflow jumping up and down are combined is adopted, the collision friction space and efficiency of materials are effectively improved, and the phenomena of compaction and agglomeration of the materials in the grinding process are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of dry pulverization, in particular to a rotating fluidized bed grinding and pulverizing device. Background Art

[0002] Non-metallic materials involve all aspects of life and industrial production, and are widely used in non-metallic mining, chemical industry, metallurgy, food, medicine, feed, coating, plastic, rubber and other industries. The crushing of non-metallic materials is an important part of their processing and utilization. Therefore, dry crushing technology, especially air flow milling technology, occupies an important position in the crushing operation of materials.

[0003] However, most of the existing airflow mill technologies use a supersonic nozzle to eject a jet toward the center of the bottom surface, causing the material to collide and break and rise, and then the rising material is classified by a classification wheel, and the material that does not meet the requirements falls back and continues to be collided and broken by the supersonic airflow. In order to ensure the supersonic speed of the ejected material, this airflow mill technology has high requirements for the design and material of the nozzle, and the performance of the induced air (or blast) device, and the ultra-high-speed airflow can easily cause impact on the internal components of the crushing chamber, reducing its service life; at the same time, the existing airflow mill technology can only collide and break at the jet convergence point, resulting in low overall crushing efficiency. Summary of the invention

[0004] In view of this, the utility model provides a rotating fluidized bed grinding and crushing device, which has the characteristics of long service life and high crushing efficiency.

[0005] The utility model solves the above problems through the following technical means:

[0006] The utility model discloses a rotating fluidized bed grinding and pulverizing device, comprising a grinding cylinder, a classifying wheel arranged at the upper part of the grinding cylinder, a discharge port arranged at the top of the grinding cylinder and connected with the discharge port of the classifying wheel, a gas distribution plate arranged at a lower position in the grinding cylinder, grinding balls arranged at the upper end of the gas distribution plate, a central tube arranged at the center of the bottom of the grinding cylinder and passing through the gas distribution plate, a feed port arranged on the side wall of the grinding cylinder, a plurality of inclined outer air nozzles distributed in a ring array on the side wall of the grinding cylinder relative to the gas distribution plate, a plurality of inclined inner air nozzles arranged on the central tube relative to the plurality of inclined outer air nozzles, and an air inlet pipe arranged on the side wall of the grinding cylinder at the lower side of the gas distribution plate.

[0007] Preferably, the gas distribution plate is sealed and installed with the inner wall of the pulverizing cylinder through a sealing fixing ring.

[0008] As a further improvement of the above technical solution, a grinding ring is provided at the upper end of the gas distribution plate and is arranged close to the inner wall of the pulverizing cylinder.

[0009] Preferably, the inner side surface of the grinding ring is an arc-shaped curved surface structure, and the radius of the arc-shaped curved surface is greater than the radius of the grinding ball.

[0010] Preferably, there are a plurality of grinding balls, and the grinding balls are of different sizes.

[0011] Preferably, the top of the central tube is a conical guide surface or a hemispherical guide surface.

[0012] As a further improvement of the above technical solution, a window for observing the internal crushing state is also provided on the side wall of the crushing cylinder.

[0013] Preferably, an arc-shaped guide plate is provided on the outer side of the feeding port of the grading wheel.

[0014] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0015] The rotating fluidized bed grinding and crushing device of the utility model adopts a method of combining an ascending airflow with a rotating airflow that jumps up and down, so as to cause the material to jump up and down and rotate on the gas distribution plate, effectively increasing the collision and friction space and efficiency of the material, and avoiding the compaction and agglomeration of the material during the grinding process; while the material itself is rubbed, collided and crushed, the rotating grinding balls roll the material to further crush the material, thereby improving the grinding and crushing rate of the material; and the utility model avoids the use of supersonic airflow, thereby avoiding the impact damage of the high-speed airflow to the internal components and extending the service life; and the inclined downward airflow is provided through the inclined outer air nozzle and the inclined inner air nozzle, and the air inlet pipe provides an upward airflow through the gas distribution plate, and the air flow difference between the two can be used to preliminarily screen the powder, which is particularly suitable for the grinding and crushing of ultrafine powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a rotating fluidized bed grinding and pulverizing device of the utility model;

[0017] Figure 2 It is a distribution diagram of the inclined outer air nozzle and the inclined inner air nozzle of the rotating fluidized bed grinding and pulverizing device of the utility model.

[0018] like Figure 1 , Figure 2 , crushing cylinder -1, classifying wheel -2, discharge port -3, gas distribution plate -4, grinding balls -5, center cylinder -6, feed port -7, inclined outer air nozzle -8, inclined inner air nozzle -9, air inlet pipe -10, grinding ring -11, window -12, arc guide plate -13. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0021] The utility model will be described in detail below with reference to the accompanying drawings. Figure 1 to Figure 2 As shown: The rotating fluidized bed grinding and pulverizing device described in this embodiment includes a grinding cylinder 1, a classifying wheel 2 arranged at the upper inner part of the grinding cylinder 1, a discharge port 3 arranged at the top of the grinding cylinder 1 and connected with the discharge port of the classifying wheel 2, a gas distribution plate 4 arranged at a lower position in the grinding cylinder 1, a grinding ball 5 arranged at the upper end of the gas distribution plate 4, a central tube 6 arranged at the center of the bottom of the grinding cylinder 1 and passing through the gas distribution plate 4, a feed port 7 arranged on the side wall of the grinding cylinder 1, a plurality of inclined outer air nozzles 8 distributed in a ring array on the side wall of the grinding cylinder 1 relative to the gas distribution plate 4, a plurality of inclined inner air nozzles 9 arranged on the central tube 6 relative to the plurality of inclined outer air nozzles 8, and an air inlet pipe 10 arranged on the side wall of the grinding cylinder 1 at the lower side of the gas distribution plate 4.

[0022] The rotating fluidized bed grinding and crushing device described in this embodiment adopts a method of combining an ascending airflow with a rotating airflow that jumps up and down, so as to cause the material to jump up and down and rotate on the gas distribution plate 4, thereby effectively increasing the collision and friction space and efficiency of the material and avoiding the compaction and agglomeration of the material during the grinding process; while the material itself is rubbed, collided and crushed, the rotating grinding balls 5 further crush the material by rolling it, thereby improving the grinding and crushing rate of the material; and the utility model avoids the use of supersonic airflow, thereby avoiding the impact damage of the internal components caused by the high-speed airflow and extending the service life; and the inclined downward airflow is provided through the inclined outer air nozzle 8 and the inclined inner air nozzle 9, and the air inlet pipe 10 provides an upward airflow through the gas distribution plate 4, and the air flow difference between the two can be used to preliminarily screen the powder, which is particularly suitable for the grinding and crushing of ultrafine powder.

[0023] In the rotating fluidized bed grinding and crushing device described in this embodiment, the gas distribution plate 4 divides the internal space of the crushing cylinder 1 from top to bottom into a crushing chamber and an air chamber, and the multiple inclined outer air nozzles 8 and the multiple inclined inner air nozzles 9 in the crushing chamber are all connected to the fluidizing fan, and the air inlet pipe 10 in the air chamber is connected to the blowing fan. When in use, the material is first fed into the crushing chamber from the feed port 7 and accumulated on the gas distribution plate 4, and then the fluidizing fan is turned on. At this time, the airflow ejected by the relatively arranged inclined outer air nozzles 8 and the inclined inner air nozzles 9 can impact and crush the material at the intersection of the two airflows, and the ejected airflow also forms a jumping rotating airflow in the crushing chamber, thereby prompting the grinding balls 5 on the gas distribution plate 4 and the material to rotate with the airflow. Since the size and mass of the grinding balls 5 and the size and mass of the material particles are both large and small, the grinding balls 5 and the material particles are relatively large and small. The grinding balls 5 grind and crush the materials, and the inclined jet airflow will rebound upward after hitting the gas distribution plate 4, thereby increasing the air collision and friction between the materials and improving the crushing efficiency. The blowing fan is turned on until the materials are crushed to an appropriate particle size, and its wind force is adjusted to be greater than the wind force of the fluidizing fan. An upward airflow is formed through the gas distribution plate 4. At this time, the materials are preliminarily screened, and the light materials rise with the rising air flow. The powder with qualified particle size is discharged from the discharge port 3 through the upper grading wheel 2, and the unqualified powder falls back to continue fluidized grinding. When the remaining materials are crushed to float up and down in the crushing chamber, the wind force of the blowing fan is appropriately reduced for grinding and crushing, until the powder in the crushing chamber is discharged from the discharge port 3 through the grading wheel 2.

[0024] In order to facilitate installation and avoid powder leakage, as a preferred implementation of the above technical solution, the gas distribution plate 4 is sealed and installed with the inner wall of the grinding cylinder 1 through a sealing fixing ring (not shown in the figure).

[0025] As a further improvement of the above technical solution, the upper end of the gas distribution plate 4 is provided with a grinding ring 11 which is arranged close to the inner wall of the crushing cylinder 1. When the material and the grinding balls 5 are centrifugally rotated, a greater friction force can be generated with the material and the grinding balls 5, thereby improving the friction crushing efficiency.

[0026] As a preferred implementation of the above technical solution, the inner side surface of the grinding ring 11 is an arc-shaped curved surface structure, and the radius of the arc-shaped curved surface is greater than the radius of the grinding ball 5, so that the grinding ball 5 has no grinding dead angle when rotating and grinding on the grinding ring 11, thereby improving the grinding effect and efficiency.

[0027] As a preferred implementation of the above technical solution, there are multiple grinding balls 5, and the multiple grinding balls 5 are of different sizes, which further improves the grinding effect.

[0028] As a preferred implementation of the above technical solution, the top of the central tube 6 is a conical guide surface or a hemispherical guide surface, which can guide the materials falling from the crushing chamber.

[0029] For ease of use, as a further improvement of the above technical solution, a window 12 for observing the internal pulverizing state is further provided on the side wall of the pulverizing cylinder 1.

[0030] For ease of use, as a preferred implementation of the above technical solution, an arc-shaped guide plate 13 is provided on the outer side of the feed port 7 of the grading wheel 2 to guide the upwardly flying materials and improve the effective discharge efficiency.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A rotating fluidized bed grinding and pulverizing device, characterized in that: It includes a pulverizing cylinder, a classifying wheel arranged at the upper part of the pulverizing cylinder, a discharge port arranged at the top of the pulverizing cylinder and connected with the discharge port of the classifying wheel, a gas distribution plate arranged at a lower position in the pulverizing cylinder, grinding balls arranged at the upper end of the gas distribution plate, a central tube arranged at the center of the bottom of the pulverizing cylinder and passing through the gas distribution plate, a feed port arranged on the side wall of the pulverizing cylinder, a plurality of inclined outer air nozzles distributed in a ring array on the side wall of the pulverizing cylinder relative to the gas distribution plate, a plurality of inclined inner air nozzles arranged on the central tube relative to the plurality of inclined outer air nozzles, and an air inlet pipe arranged on the side wall of the pulverizing cylinder at the lower side of the gas distribution plate.

2. A rotating fluidized bed grinding and pulverizing device according to claim 1, characterized in that: The gas distribution plate is sealed and installed with the inner wall of the pulverizing cylinder through a sealing fixing ring.

3. The rotating fluidized bed grinding and pulverizing device according to claim 1, characterized in that: The upper end of the gas distribution plate is provided with a grinding ring which is arranged closely against the inner wall of the pulverizing cylinder.

4. A rotating fluidized bed grinding and pulverizing device according to claim 3, characterized in that: The inner side surface of the grinding ring is an arc-shaped curved surface structure, and the radius of the arc-shaped curved surface is greater than the radius of the grinding ball.

5. The rotating fluidized bed grinding and pulverizing device according to claim 1, characterized in that: There are a plurality of grinding balls, and the grinding balls are of different sizes.

6. The rotating fluidized bed grinding and pulverizing device according to claim 1, characterized in that: The top of the central tube is a conical guide surface or a hemispherical guide surface.

7. The rotating fluidized bed grinding and pulverizing device according to claim 1, characterized in that: A window for observing the internal pulverizing state is also provided on the side wall of the pulverizing cylinder.

8. The rotating fluidized bed grinding and pulverizing device according to claim 1, characterized in that: An arc-shaped guide plate is arranged on the outer side of the feeding port of the grading wheel.

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