Airflow crushing device

Abstract

The invention discloses an airflow crushing device, and belongs to the technical field of steam mills. The airflow crushing device comprises a crushing chamber, and at least two air inlets are formed in the side wall of the crushing chamber; a discharge port is formed in the upper side of the crushing chamber; the grading device is mounted on the inner side of the discharge port of the crushing chamber; and the guiding device is located on the lower side of the grading device, and the guiding device comprises a guiding plate for guiding unqualified materials discharged by the grading device to be close to the side wall of the crushing chamber. The airflow crushing device solves the problem that an existing airflow crushing device is low in grading efficiency.

Description

Technical Field

[0001] The invention relates to the field of pulverizing devices, and in particular to an air flow pulverizing device. Background Art

[0002] Air flow milling utilizes the self-grinding effect of materials, uses high-speed airflow or hot steam generated by compressed air to impact the materials, causing strong collision and friction between the materials to achieve the purpose of crushing.

[0003] Generally, the air flow pulverizing device includes a pulverizing chamber. The material is introduced into the pulverizing chamber under the action of high-speed airflow or hot steam. The material is repeatedly collided, rubbed, sheared and pulverized at the intersection of high-pressure airflow. The pulverized material moves to the classification area with the rising airflow under the suction of the fan. The classification area of ​​the pulverizing chamber is provided with a grading device to screen the material. Under the strong centrifugal force generated by the high-speed rotating grading turbine, the coarse and fine materials are separated. The fine particles that meet the particle size requirements enter the cyclone separator and dust collector for collection through the grading wheel, and the coarse particles fall to the pulverizing area for further pulverization, and the cycle repeats. Since the unqualified powder is too dispersed after grading by the grading device and its weight is relatively low, under the action of the flow field of the grading device, part of the powder does not go to the collision area for re-collision and pulverization as designed during the falling process, but is directly mixed back to the central upward area of ​​the pulverizing chamber, so that the grading efficiency is low. Summary of the invention

[0004] The technical problem to be solved by the present invention is the low classification efficiency of the existing air flow pulverizing device.

[0005] In view of the above technical problems, the present invention provides the following technical solutions:

[0006] An air flow pulverizing device comprises a pulverizing chamber, wherein at least two air inlets are arranged on the side wall of the pulverizing chamber; a discharge port is arranged on the upper side of the pulverizing chamber; a grading device, wherein the grading device is installed on the inner side of the discharge port of the pulverizing chamber; and a guiding device, which is located at the lower side of the grading device and comprises a guide plate for guiding unqualified materials discharged by the grading device to the side wall of the pulverizing chamber.

[0007] In some embodiments of the present invention, the grading device includes a grading wheel, and the grading wheel includes a bottom wall and a cylindrical side wall. The bottom wall is provided with a grading feed port, and the cylindrical side wall is provided with a plurality of grids.

[0008] In some embodiments of the present invention, the crushing chamber includes a discharge zone, a transition zone, a feeding zone and a waste zone from top to bottom, wherein the discharge zone and the feeding zone are cylindrical, the inner diameter of the discharge zone is larger than the inner diameter of the feeding zone, the transition zone and the waste zone are inverted cones, and the waste zone has a waste port at the bottom.

[0009] In some embodiments of the present invention, the guide plate is an annular plate connected to the bottom wall of the classifying wheel, the guide plate extends downwardly in an inclined manner, and the lower end of the guide plate is closer to the inner wall of the crushing chamber than the upper end thereof.

[0010] In some embodiments of the present invention, the guide plate includes a first annular area, a second annular area and a third annular area connected in sequence from top to bottom, the first annular area and the second annular area are annular plates whose extension direction is inclined relative to the longitudinal center line of the crushing chamber, and the third annular area is an annular plate whose extension direction is parallel to the longitudinal center line of the crushing chamber.

[0011] In some embodiments of the present invention, the upper outer diameter of the first annular zone is consistent with the outer diameter of the classifying wheel, and the lower outer diameter of the first annular zone is larger than the outer diameter of the classifying wheel; the upper outer diameter of the second annular zone is larger than the lower outer diameter of the second annular zone.

[0012] In some embodiments of the present invention, the inclination angle of the first annular area relative to the longitudinal center line of the pulverizing chamber is 20°-40°.

[0013] In some embodiments of the present invention, the relationship between the outer diameter d2 of the lower end of the first annular zone and the inner diameter D0 of the area where the grinding chamber is located is: d2=(0.85-0.9)D0.

[0014] In some embodiments of the present invention, the second annular zone is located in a transition zone of the pulverizing chamber, and the inclination angle of the second annular zone is consistent with that of the transition zone.

[0015] In some embodiments of the present invention, the third annular zone is located in the feeding zone of the pulverizing chamber, and a distance L between the bottom surface of the third annular zone and the air inlet of the pulverizing chamber in the vertical direction is 10 cm-50 cm.

[0016] The technical solution of the present invention has the following technical effects compared with the prior art:

[0017] In the air flow pulverizing device provided by the present invention, a guiding device is arranged at the lower side of the grading device, and the guiding device guides the unqualified particles with larger particle sizes discharged by the grading device to the area close to the side wall of the pulverizing chamber, so that they fall at a low speed to the collision zone located in the lower middle part of the pulverizing chamber, and avoid the particles being mixed with the particles after the collision on the upper side of the pulverizing chamber and then entering the grading device again for grading treatment, resulting in the problem of low grading efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention, wherein:

[0019] Figure 1It is a structural schematic diagram of a first specific embodiment of the airflow pulverizing device of the present invention;

[0020] Figure 2 It is a front cross-sectional view of a first specific embodiment of the airflow pulverizing device of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a second specific embodiment of the airflow pulverizing device of the present invention;

[0022] Figure 4 It is a front cross-sectional view of a second specific embodiment of the air flow pulverizing device of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1-Figure 4The figure shows a specific embodiment of the air flow pulverizing device provided by the present invention, which includes a pulverizing chamber 10, at least two air inlets 10a are arranged on the side wall of the pulverizing chamber 10, and the air inlet directions of the two air inlets 10a are arranged opposite to each other, and a discharge port 10b is arranged on the upper side of the pulverizing chamber 10; the powder enters the pulverizing chamber 10 along the air inlets 10a arranged opposite to each other along the pulverizing chamber 10 with the high-pressure steam, collides with each other to form smaller powder particles, and is discharged through the discharge port 10b on the top.

[0028] The air flow pulverizing device also includes a grading device 20 installed on the inner side of the discharge port 10b of the pulverizing chamber 10 and a guiding device 30 located at the lower side of the grading device 20; the powder particles after collision enter the grading device 20 for screening, and the qualified powder particles with smaller particle size are discharged along the top discharge port 10b, and the unqualified particles with larger particle size are discharged back into the pulverizing chamber 10 for further collision and pulverization; the guiding device 30 includes a guide plate 30, which guides the unqualified particles with larger particle size discharged from the grading device 20 to the side wall close to the pulverizing chamber 10, so as to avoid the unqualified particles discharged from the grading device 20 from mixing with the particles after collision on the upper side of the pulverizing chamber 10 and entering the grading device 20 for grading again, resulting in low grading efficiency.

[0029] Specifically, in an optional embodiment, the grading device 20 includes a grading wheel, and the grading wheel includes a bottom wall 21 and a cylindrical side wall 22. The bottom wall 21 is provided with a grading feed port 20a, and the cylindrical side wall 22 is provided with a plurality of grids extending in the longitudinal direction. Under the action of the flow field in the crushing chamber 10, the particles after collision (including crushed and uncrushed particles) are concentrated and moved upward along the center of the crushing chamber 10, and after entering through the grading feed port 20a, the qualified particles with smaller particle size flow out from the discharge port 10b at the top of the crushing chamber 10, and the unqualified particles with larger particle size are discharged along the grid of the grading wheel into the crushing chamber 10 for re-collision and crushing.

[0030] Specifically, the center line of the discharge port 10b of the pulverizing chamber 10 coincides with the center line of the grading feed port 20a, and coincides with the longitudinal center line of the pulverizing chamber 10. Since the air inlet 10a of the pulverizing chamber 10 is located in the opposite area of ​​the side wall of the pulverizing chamber 10, the powder particles collide in the central area of ​​the pulverizing chamber 10 under the high-pressure jet of the air inlet 10a, and the powder after the collision rises along the central area to the grading feed port 20a, and is discharged through the discharge port 10b at the top, so that the flow field is unobstructed and the pulverizing efficiency is high.

[0031] Specifically, in an optional embodiment, the crushing chamber 10 includes a discharge zone 11, a transition zone 12, a feed zone 13 and a waste zone 14 from top to bottom, wherein the discharge zone 11 and the feed zone 13 are cylindrical, the inner diameter of the discharge zone 11 is larger than the inner diameter of the feed zone 13, specifically, the inner diameter D0 of the discharge zone 11 is 1.3-1.4 times the inner diameter D1 of the feed zone 13, the transition zone 12 and the waste zone 14 are inverted cones, and the waste zone 14 has a waste port 10c at the bottom; unqualified powder waste deposited at the bottom of the waste zone 14 is eventually discharged from the outside of the crushing chamber 10 through the waste port 10c.

[0032] The structure of the guide plate 30 is not unique; Figure 1 , Figure 2 A specific embodiment is shown, wherein the guide plate 30 is an annular plate connected to the bottom wall 21 of the classifying wheel, the guide plate 30 extends downwardly at an angle, and the lower end of the guide plate 30 is closer to the inner wall of the pulverizing chamber 10 relative to the upper end thereof, that is, the guide plate 30 guides the unqualified particles discharged by the classifying wheel toward the side wall of the pulverizing chamber 10, and the powder particles close to the side wall area can descend at a low speed to avoid the powder being blown back into the classifying wheel.

[0033] The lower end of the guide plate 30 extends to the lowermost end of the discharge area 11 of the crushing chamber 10, wherein the inclination angle α1 of the guide plate 30 relative to the longitudinal center line of the crushing chamber 10 is 20°-40°, the upper end outer diameter of the guide plate 30 is consistent with the outer diameter of the grading wheel, and the lower end outer diameter d1 of the guide plate 30 is the outer diameter D0 of the area where the crushing chamber 10 is located, and the relationship is: d1=(0.85-0.9)D0.

[0034] like Figure 3 , Figure 4 Another specific embodiment of the guide plate 30 is shown, wherein the guide plate 30 includes a first annular area 31, a second annular area 32 and a third annular area 33 connected in sequence from top to bottom, the first annular area 31 and the second annular area 32 are annular plates whose extension direction is inclined relative to the longitudinal center line of the crushing chamber 10, and the third annular area 33 is an annular plate whose extension direction is parallel to the longitudinal center line of the crushing chamber 10.

[0035] The upper outer diameter of the first annular zone 31 is consistent with the outer diameter of the classifying wheel, and the lower outer diameter of the first annular zone 31 is larger than the outer diameter of the classifying wheel; the upper outer diameter of the second annular zone 32 is larger than the lower outer diameter of the second annular zone 32.

[0036] The first annular zone 31 has an inclination angle α2 of 20°-40° relative to the longitudinal center line of the pulverizing chamber 10. The relationship between the lower end outer diameter d2 of the first annular zone 31 and the inner diameter D0 of the pulverizing chamber 10 is: d2=(0.85-0.9)D0.

[0037] The lower end of the first annular zone 31 extends to the transition zone 12 of the pulverizing chamber 10, and the second annular zone 32 is located in the transition zone 12 of the pulverizing chamber 10. The second annular zone 32 has the same inclination angle as the transition zone 12, that is, the generatrix of the second annular zone 32 is arranged parallel to the generatrix of the transition zone 12, that is, the outer diameter of the second annular zone 32 is always (0.85-0.9) times the inner diameter of the transition zone 12 of the pulverizing chamber 10, so that the unqualified powder with larger particle size discharged by the grading wheel falls stably in the side wall area of ​​the pulverizing chamber 10.

[0038] Specifically, the third annular zone 33 is located in the feed zone 13 of the pulverizing chamber 10. Since the upper end of the third annular zone 33 is in the same horizontal direction as the upper end of the feed zone 13 of the pulverizing chamber 10, the outer diameter of the third annular zone 33 is (0.85-0.9) times the inner diameter of the feed zone 13 of the pulverizing chamber 10, so that unqualified powders continue to fall along the side wall area of ​​the pulverizing chamber 10. The distance L between the bottom surface of the third annular zone 33 and the air inlet 10a of the pulverizing chamber 10 in the vertical direction is 10cm-50cm, so as to ensure that when the powders descend to the area where the air inlet 10a is located, they will be carried to the collision area by the flow field near the air inlet 10a to achieve secondary collision crushing.

[0039] Specifically, since the extension length of the guide plate 30 in this embodiment is relatively long, in order to improve the stability of the guide plate 30 and prevent the high-speed airflow in the crushing chamber 10 from causing the guide plate 30 to shake and thus affect the direction of the powder airflow, the guide plate 30 is connected to the inner wall of the crushing chamber 10 through a support beam. Specifically, the support beam extends in the horizontal direction, one end of which is connected to the outer wall of the guide plate 30 located in the longitudinal middle area, and the other end is connected to the inner wall of the corresponding area of ​​the crushing chamber 10.

[0040] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A jet milling device, characterized in that: include: A pulverizing chamber, wherein at least two air inlets are arranged on the side wall of the pulverizing chamber; a discharge port is arranged on the upper side of the pulverizing chamber; A grading device, the grading device is installed inside the discharge port of the pulverizing chamber; The guiding device is located at the lower side of the classifying device, and the guiding device includes a guiding plate for guiding unqualified materials discharged from the classifying device to the side wall close to the crushing chamber.

2. The air flow pulverizing device according to claim 1, characterized in that: The grading device comprises a grading wheel, and the grading wheel comprises a bottom wall and a cylindrical side wall. The bottom wall is provided with a grading feed port, and the cylindrical side wall is provided with a plurality of grids.

3. The air flow pulverizing device according to claim 2, characterized in that: The crushing chamber includes a discharge area, a transition area, a feeding area and a waste area from top to bottom, wherein the discharge area and the feeding area are cylindrical, the inner diameter of the discharge area is larger than the inner diameter of the feeding area, the transition area and the waste area are inverted cones, and the waste area has a waste port at the bottom.

4. The air flow pulverizing device according to claim 2, characterized in that: The guide plate is an annular plate connected to the bottom wall of the classifying wheel. The guide plate extends downwardly in an inclined manner, and the lower end of the guide plate is closer to the inner wall of the crushing chamber than the upper end thereof.

5. The air flow pulverizing device according to claim 2, characterized in that: The guide plate includes a first annular area, a second annular area and a third annular area connected in sequence from top to bottom, the first annular area and the second annular area are annular plates whose extension direction is inclined relative to the longitudinal center line of the crushing chamber, and the third annular area is an annular plate whose extension direction is parallel to the longitudinal center line of the crushing chamber.

6. The air flow pulverizing device according to claim 5, characterized in that: The upper outer diameter of the first annular zone is consistent with the outer diameter of the classifying wheel, and the lower outer diameter of the first annular zone is larger than the outer diameter of the classifying wheel; the upper outer diameter of the second annular zone is larger than the lower outer diameter of the second annular zone.

7. The air flow pulverizing device according to claim 5, characterized in that: The first annular zone has an inclination angle of 20°-40° relative to the longitudinal center line of the pulverizing chamber.

8. The air flow pulverizing device according to claim 5, characterized in that: The relationship between the outer diameter d2 of the lower end of the first annular zone and the inner diameter D0 of the area where the grinding chamber is located is: d2=(0.85-0.9)D0.

9. The air flow pulverizing device according to claim 5, characterized in that: The second annular zone is located in the transition zone of the pulverizing chamber, and the inclination angle of the second annular zone is consistent with that of the transition zone.

10. The air flow pulverizing device according to claim 5, characterized in that: The third annular zone is located in the feeding zone of the pulverizing chamber, and the distance L between the bottom surface of the third annular zone and the air inlet of the pulverizing chamber in the vertical direction is 10 cm-50 cm.

Images