Airflow crushing device

Abstract

The invention discloses an airflow crushing device, and belongs to the technical field of steam mills. The air flow crushing device comprises a crushing chamber, wherein at least two air inlets are formed in the side wall of the crushing chamber; a discharge opening is formed in the top of the crushing chamber; the grading device is mounted on the inner side of the discharging opening of the crushing chamber, and a grading feeding opening is formed in the lower side of the grading device; the modifying device is located on the lower side of the grading device and comprises an annular distributor, the modifying device is communicated with a modifying material supply device through a modifying agent pipeline, a plurality of spraying holes are formed in the annular distributor, and the spraying holes face the inner side area of the annular distributor. The problems that equipment is complex and cost is high due to the fact that existing powder smashing and modifying are carried out separately are solved.

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, and uses high-speed airflow or hot steam generated by compressed air to impact materials, so that materials collide and rub strongly with each other to achieve the purpose of crushing. The materials are passed into the crushing chamber under the action of high-speed airflow or hot steam. At the intersection of high-pressure airflow, the materials are repeatedly collided, rubbed, sheared and crushed. The crushed materials move to the classification area with the rising airflow under the suction force of the fan. Under the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials are separated. The fine particles that meet the particle size requirements are collected by the cyclone separator and dust collector through the classification wheel, and the coarse particles fall to the crushing area to continue to be crushed, and the cycle repeats.

[0003] When powder needs to be modified, a special modification equipment is usually added in the subsequent process of the airflow milling device. For example, the modification equipment is an intermittent stirring tank, which needs to be equipped with a series of equipment such as a buffer tank to achieve powder modification, which is complicated to operate and costly. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing powder pulverization and modification are carried out separately, resulting in complex equipment and high cost.

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

[0006] A gas 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 top 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 grading feed port is arranged on the lower side of the grading device; a modifying device located on the lower side of the grading device, comprising an annular distributor, which is connected to a modified material supply device through a modifier pipeline, and a plurality of spray holes are arranged on the annular distributor, and the spray holes are oriented toward the inner area of ​​the annular distributor.

[0007] In some embodiments of the present invention, the spray holes of the annular distributor are located in the inner lower area of ​​the annular distributor.

[0008] In some embodiments of the present invention, the angle between the direction of the spray hole and the horizontal direction is between 30° and 60°.

[0009] In some embodiments of the present invention, the center line of the discharge port of the pulverizing chamber coincides with the longitudinal center line of the pulverizing chamber, and the center line of the annular distributor coincides with the longitudinal center line of the pulverizing chamber.

[0010] In some embodiments of the present invention, the relationship between the distance l1 between the annular distributor and the top of the grinding chamber and the distance l2 from the air inlet of the grinding chamber to the top of the grinding chamber is l1=(1 / 6-1 / 4)l2.

[0011] In some embodiments of the present invention, the relationship between the maximum diameter d1 of the annular distributor and the inner diameter D0 of the grinding chamber in the area where the annular distributor is located is d1=(0.42-0.5)D0.

[0012] In some embodiments of the present invention, the grading device is a grading wheel, which is mounted on the top wall of the pulverizing chamber, the grading feed port is arranged in the central area of ​​the bottom wall of the grading wheel, and the circumferential side wall of the grading wheel is provided with a plurality of grids extending in the longitudinal direction; the center line of the annular distributor coincides with the center line of the grading feed port

[0013] In some embodiments of the present invention, the minimum inner diameter d2 of the annular distributor is larger than the diameter of the classification feed port, and the maximum diameter d1 of the annular distributor is smaller than the outer diameter of the classification wheel.

[0014] 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.

[0015] In some embodiments of the present invention, the classification device and the annular distributor are located in the discharge area, and the air inlet is located in the feed area.

[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 modification device for modifying powder particles is arranged inside the pulverizing chamber, so that powder pulverization and spraying are completed in the same device, and the fluidized state of the powder in the steam mill is reasonably utilized for efficient spraying, saving the investment in subsequent modification equipment. At the same time, during the steam milling process, the operating temperature in the pulverizing chamber is about 200°C, and the modifier can be fully atomized by means of the temperature in the steam mill, which is conducive to the atomization spraying of the modifier. 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 1 It is a structural schematic diagram of a specific embodiment of the airflow pulverizing device of the present invention;

[0020] Figure 2 A three-dimensional cross-sectional view of a specific embodiment of the airflow pulverizing device of the present invention;

[0021] Figure 3 It is a plan cross-sectional view of a specific embodiment of the air flow pulverizing device of the present invention. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 1-Figure 3 The figure shows a specific embodiment of the air flow pulverizing device provided by the present invention, including a pulverizing chamber 10, at least two air inlets 10a are arranged on the side wall of the pulverizing chamber 10, 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 top of the pulverizing chamber 10; the powder enters the pulverizing chamber 10 along the two oppositely arranged air inlets 10a of the pulverizing chamber 10 along with the high-pressure steam, collides to form smaller powder particles, and is discharged through the discharge port 10b on the top.

[0027] The invention also includes a classifying device 20 installed on the inner side of the discharge port 10b of the pulverizing chamber 10 and a modifying device 30 located at the lower side of the classifying device 20. The lower side of the classifying device 20 is provided with a classifying feed port 20a. After the collision, the powder particles enter the classifying device 20 along the classifying feed port 20a and are screened. 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 re-discharged into the pulverizing chamber 10 along the classifying device 20; the modifying device 30 includes an annular distributor 31 connected to a modified material supply device (not shown in the figure) through a modifier pipeline 32, and a plurality of spray holes 31a are provided on the annular distributor 31, and the spray holes 31a face the inner area of ​​the annular distributor 31; the modifier enters the annular distributor 31 along the modifier pipeline 32 and is sprayed to the classifying feed port 20a side of the classifying device 20 through its spray holes 31a, so that the powder is modified and sprayed.

[0028] Since the powder flows in a fluidized form during the steam milling process, it is the best form for uniformly and fully spraying the modifier. Therefore, the powder crushing and spraying are completed in the same equipment, which rationally utilizes the fluidized form of the powder in the steam mill for efficient spraying, saving the investment in subsequent modification equipment. At the same time, during the steam milling process, the operating temperature in the crushing chamber 10 is about 200°C, and the modifier can be fully atomized by the temperature in the steam mill, which is conducive to the atomization spraying of the modifier.

[0029] Specifically, the modifier has different forms; if the modifier is in gas phase, Figure 1 As shown in the figure, the supply modifier pipeline 32 is used for direct feeding, and the gaseous modifier is sprayed obliquely downward from the spray hole 31a of the annular distributor 31. The power source can be a blower (nitrogen / steam can be used as a carrier, and air can also be used as a carrier when there are no reaction and safety problems). If the modifier is in liquid phase, a hydraulic pump is used to pressurize the liquid modifier in the supply modifier pipeline 32, and the annular distributor 31 needs to add an atomizing nozzle at the spray hole 31a; if the modifier is in powder form, a blower / air compressor is used to bring the powder into the annular distributor 31 with nitrogen / steam.

[0030] Specifically, in an optional embodiment, the spray hole 31a of the annular distributor 31 is located in the inner lower area of ​​the annular distributor 31; when the modifier is coated, it first contacts the ground powder in a countercurrent manner downwardly, and at the same time radially cuts into the interior of the powder concentration area to perform sufficient coating, and then the initial kinetic energy of the modifier disappears and turns upward under the action of the low pressure at the top of the cavity, and flows downstream with the upward airflow and powder in the grinding chamber 10, during which a secondary coating will be performed, and finally the fully coated powder flows out of the grinding chamber 10 as a product.

[0031] More specifically, the angle α between the direction of the spray hole 31a and the horizontal direction is between 30° and 60°, for example, the angle α is selected to be 45°.

[0032] Specifically, in an optional embodiment, the grading device 20 is a grading wheel, which is mounted on the top wall of the crushing chamber 10, and the grading feed port 20a is arranged in the central area of ​​the grading wheel, and the cylindrical side wall of the grading wheel is provided with a plurality of grids 21 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 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 21 of the grading wheel into the crushing chamber 10 for re-collision and crushing.

[0033] The center line of the discharge port 10b of the crushing chamber 10 coincides with the center line of the grading feed port 20a, the center line of the annular distributor 31 coincides with the center line of the grading feed port 20a, and the minimum inner diameter d2 of the annular distributor 31 is greater than the diameter of the grading feed port 20a. The annular distributor 31 is overlapped with the center line of the grading wheel and the crushing chamber 10, which can conform to the flow field of the crushing chamber 10 in the crushing chamber 10, and the airflow and the powder generally show an upward trend, which can coat most of the powder particles, and the coated powder is directly discharged after passing through the grading device 20.

[0034] Specifically, the relationship between the distance l1 between the annular distributor 31 and the top of the pulverizing chamber 10 and the distance l2 between the air inlet 10a of the pulverizing chamber 10 and the top of the pulverizing chamber 10 is l1=(1 / 6-1 / 4)l2. The annular distributor 31 is located in a height area away from the collision zone and where the powder movement speed is relatively slow, so that the powder particles can be fully coated. At the same time, the problem of serious wear of the annular distributor 31 by high-speed powder particles can be avoided.

[0035] The relationship between the maximum diameter d1 of the annular distributor 31 and the inner diameter D0 of the grinding chamber 10 in the area where the annular distributor 31 is located is d1=(0.42-0.5)D0. The annular distributor 31 adopts the above diameter range so that the airflow in the internal area of ​​the annular distributor 31 generally shows an upward trend, realizing reverse coating of the powder and sufficient coating.

[0036] More specifically, the maximum diameter d1 of the annular distributor 31 is smaller than the diameter of the classifying wheel and is approximately 4 cm to 10 cm away from the bottom of the classifying wheel, so that most of the particles entering the classifying wheel can be coated, while preventing unqualified particles descending from the outer area of ​​the classifying wheel from contacting the modifier, thereby improving the utilization rate of the modifier.

[0037] The pulverizing chamber 10 includes a discharge area 11, a transition area 12, a feed area 13 and a waste area 14 from top to bottom. The discharge area 11 and the feed area 13 are cylindrical, the inner diameter D0 of the discharge area 11 is 1.3-1.4 times the inner diameter D1 of the feed area 13, the transition area 12 is inverted cone shape, and the inclined transition surface of the transition area 12 realizes the transition between the discharge area 11 and the feed area 13, the waste area 14 is inverted cone shape, and the bottom of the waste area 14 has a waste port 10c, and the unqualified powder waste deposited at the bottom of the waste area 14 is finally discharged from the outside of the pulverizing chamber 10 through the waste port 10c.

[0038] The air inlet 10a is located in the feed area 13, and the high-speed airflow enters the feed area 13 with a smaller inner diameter along the air inlet 10a to realize the intense collision of the powder particles, which can improve the crushing efficiency of the crushing device; the grading device 20 and the annular distributor 31 are located in the discharge area 11. Since the inner diameter of the discharge area 11 is larger than that of the feed area 13, the upward flow speed of the airflow gradually decreases, and the airflow in this area is relatively stable. Coating in this area can obtain a better coating effect, thereby avoiding the problem that it is difficult to fully coat the powder when it is highly moving.

[0039] 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; and a discharge port is arranged on the top of the pulverizing chamber; A grading device, the grading device is installed on the inner side of the discharge port of the pulverizing chamber, and a grading feed port is provided on the lower side of the grading device; The modifying device located at the lower side of the grading device comprises an annular distributor, which is connected with the modifying material supply device through a modifying agent pipeline. The annular distributor is provided with a plurality of spray holes, and the spray holes face the inner area of ​​the annular distributor.

2. The air flow pulverizing device according to claim 1, characterized in that: The spray holes of the annular distributor are located in the inner lower area of ​​the annular distributor.

3. The air flow pulverizing device according to claim 2, characterized in that: The angle between the direction of the spray hole and the horizontal direction is between 30° and 60°.

4. The air flow pulverizing device according to claim 1, characterized in that: The center line of the discharge port of the pulverizing chamber coincides with the longitudinal center line of the pulverizing chamber, and the center line of the annular distributor coincides with the longitudinal center line of the pulverizing chamber.

5. The air flow pulverizing device according to claim 1, characterized in that: The relationship between the distance l1 between the annular distributor and the top of the grinding chamber and the distance l2 from the air inlet of the grinding chamber to the top of the grinding chamber is l1=(1 / 6-1 / 4)l2.

6. The air flow pulverizing device according to claim 1, characterized in that: The relationship between the maximum diameter d1 of the annular distributor and the inner diameter D0 of the grinding chamber in the area where the annular distributor is located is d1=(0.42-0.5)D0.

7. The air flow pulverizing device according to claim 1, characterized in that: The grading device is a grading wheel, which is installed on the top wall of the crushing chamber. The grading feed port is arranged in the central area of ​​the bottom wall of the grading wheel, and a plurality of grids extending in the longitudinal direction are arranged on the circumferential side wall of the grading wheel; the center line of the annular distributor coincides with the center line of the grading feed port.

8. The air flow pulverizing device according to claim 7, characterized in that: The minimum inner diameter d2 of the annular distributor is larger than the diameter of the classification feed port, and the maximum diameter d1 of the annular distributor is smaller than the outer diameter of the classification wheel.

9. The air flow pulverizing device according to claim 1, 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.

10. The air flow pulverizing device according to claim 9, characterized in that: The classifying device and the annular distributor are located in the discharge area, and the air inlet is located in the feed area.

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