Steam mill equipment

Abstract

The invention discloses steam mill equipment, and belongs to the technical field of fine powder particle crushing. Comprising a grinding cavity, at least two nozzles are arranged on the side wall of the grinding cavity, a grading area is arranged on the upper side of the grinding cavity, and a grading device is arranged in the grading area; the spraying direction of the nozzle is upwards inclined relative to the horizontal direction, at least one grinding plate is arranged on the inner side of the grinding cavity, the grinding plate is close to the inner side wall of the grinding cavity, the plate face of the grinding plate is opposite to a spraying opening of the nozzle, and airflow sprayed out along the nozzle flows to the grinding plate under the action of inertia force. The service life of the steam mill equipment can be prolonged, and the grinding efficiency of the steam mill equipment is improved.

Description

Technical Field

[0001] The invention relates to the field of fine powder particle crushing, in particular to a steam mill device. Background Art

[0002] Steam grinding equipment uses high-speed airflow or hot steam generated by compressed air to impact fine powder particles, causing strong collision and friction between material particles to achieve the purpose of crushing.

[0003] Generally, the steam mill equipment includes a grinding chamber, and the grinding chamber is provided with nozzles suitable for high-speed airflow or hot steam to enter. The high-pressure airflow is sprayed into the grinding chamber along multiple nozzles and is repeatedly collided, rubbed, sheared and crushed at the intersection. The crushed material moves to the classification area of ​​the grinding chamber with the rising airflow under the suction of the fan to screen the material. Under the strong centrifugal force generated by the high-speed rotating classification wheel, the coarse and fine materials are separated. The fine particles that meet the particle size requirements enter the cyclone separator and dust collector through the classification wheel for collection, and the coarse particles fall to the crushing area for further crushing, and so on. In the actual working application of the steam mill equipment, the gas phase and powder amount sprayed by each nozzle cannot be guaranteed to be completely equal, especially in the start-up, shutdown or accident conditions, the problem of unequal gas phase and powder amount between each nozzle is particularly obvious. At this time, a part of the powder will rush to the inner wall of the grinding chamber under the action of inertia without collision, resulting in wear of the wall of the grinding chamber and a short equipment life; at the same time, the particles that have not collided directly enter the classification area under the action of the rising airflow, resulting in low grinding efficiency. Summary of the invention

[0004] To this end, the present invention proposes a steam grinding device capable of extending the life of the device and improving the grinding efficiency.

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

[0006] A steam mill device comprises a grinding chamber, at least two nozzles are arranged on the side wall of the grinding chamber, a grading area is arranged on the upper side of the grinding chamber, and a grading device is arranged in the grading area; the spray direction of the nozzle is arranged to be inclined upward relative to the horizontal direction, at least one grinding plate is arranged inside the grinding chamber, the grinding plate is close to the inner side wall of the grinding chamber and its plate surface is arranged opposite to the nozzle outlet, and the airflow sprayed from the nozzle flows to the grinding plate under the action of inertia force.

[0007] In some embodiments of the present invention, a grinding plate is disposed inside the grinding chamber, and the grinding plate is formed as an annular plate body and is installed on the circumferential side wall of the grinding chamber.

[0008] In some embodiments of the present invention, the number of the grinding plates is consistent with the number of the nozzles and is arranged one-to-one with the nozzles, and the area of ​​the grinding plate is larger than the nozzle area of ​​the nozzle arranged on the opposite side thereof.

[0009] In some embodiments of the present invention, the grinding plate is detachably mounted on the inner wall of the grinding chamber.

[0010] In some embodiments of the present invention, the grinding chamber includes a feed grinding zone located at the lower side, the inner diameter of the feed grinding zone is smaller than the inner diameter of the grading zone, and the feed grinding zone and the grading zone are connected and transitioned through a transition zone.

[0011] In some embodiments of the present invention, the nozzle is located at the lower side of the feed grinding zone, and the angle between the spraying direction of the nozzle and the longitudinal centerline direction of the grinding chamber is between 30° and 45°.

[0012] In some embodiments of the present invention, the grinding plate is located in the feed grinding area.

[0013] In some embodiments of the present invention, a deceleration ring is further provided in the feed grinding area, the deceleration ring is connected to the pressure gas supply pipeline, and a plurality of first air outlets are provided on the upper side of the deceleration ring, and the injection direction of the first air outlets points to the longitudinal center line of the grinding chamber.

[0014] In some embodiments of the present invention, the grinding chamber includes a waste zone located at the lower side of the feed grinding zone, the waste zone is an inverted cone, a waste port is arranged at the bottom of the waste zone, a purge ring is arranged in the feed grinding zone or the waste zone, the purge ring is connected to the pressure gas supply pipeline, a plurality of second air outlets are arranged on the lower side of the purge ring, and the injection direction of the second air outlet is directed to the side wall of the waste zone.

[0015] In some embodiments of the present invention, the cone angle of the waste zone is greater than 150°.

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

[0017] In the steam grinding equipment provided by the present invention, by adopting a nozzle that sprays upward at an angle, the collision area of ​​the powder can be located on the upper side of the nozzle, and the amount of downward powder is greatly reduced under the action of the upward airflow, so as to improve the grinding efficiency; at the same time, a grinding plate is provided on the grinding chamber on the opposite side of the spray direction of the nozzle, which can receive the powder particles overflowing from the nozzle and perform secondary grinding on the powder particles, which can further improve the grinding efficiency and also prevent the high-speed powder particles that have not collided from directly rushing toward the wall of the grinding chamber under the action of inertia, resulting in greater wear of the grinding chamber and a short service life. 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 steam mill equipment of the present invention;

[0020] Figure 2 A front cross-sectional view of a specific embodiment of the steam mill device of the present invention;

[0021] Figure 3 It is a structural schematic diagram of another specific embodiment of the steam mill equipment of the present invention;

[0022] Figure 4 It is a front cross-sectional view of another specific embodiment of the steam mill equipment 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 4It is a specific embodiment of the steam mill equipment of the present invention, which includes a grinding chamber 10, at least two nozzles 11 are arranged on the side wall of the grinding chamber 10, and the nozzles 11 are arranged in pairs on the circumferential side wall of the grinding chamber 10, and a grading area 12 is arranged on the upper side of the grinding chamber, and a grading device 20 is arranged in the grading area 12; the powder particles enter along the nozzles 11 arranged opposite to the grinding chamber 10 with high-pressure steam, and the powder particles collide with each other to form smaller powder particles, and are discharged from the discharge port 10a at the top of the grading along the grading device 20 located on the upper side. The unqualified particles with larger particle size screened by the grading device 20 flow downward along the side wall of the grinding chamber 10 to the collision area to continue collision grinding.

[0028] Among them, the spraying direction of the nozzle 11 is inclined upward relative to the horizontal direction, and at least one grinding plate 30 is arranged inside the grinding chamber 10. The grinding plate 30 is close to the inner wall of the grinding chamber 10 and its plate surface is arranged opposite to the nozzle of the nozzle 11, that is, the plate surface of the grinding plate 30 is located in the spraying direction of the nozzle 11, and the airflow sprayed along the nozzle 11 can flow to the grinding plate 30 under the action of inertial force (that is, without being disturbed by other external forces).

[0029] The steam grinding equipment sets the spraying direction of the nozzle 11 to be inclined upward, so that the collision zone of the powder is located on the upper side of the nozzle 11. Under the action of the upward airflow, the amount of downward powder is greatly reduced, and the cavity below the nozzle 11 can be shortened to save space and cost; at the same time, a grinding plate 30 is set on the opposite side of the spraying direction of the nozzle 11, which can receive the powder particles overflowing from the nozzle 11 and perform secondary grinding on the powder particles to improve the grinding efficiency. At the same time, it can also prevent the high-speed powder particles that have not collided from directly rushing to the wall of the grinding cavity 10 under the action of inertia, thereby causing wear on the grinding cavity 10.

[0030] Specifically, in an optional embodiment, the grinding plate 30 is made of wear-resistant ceramic material, which has the characteristics of high hardness and wear resistance. The high-speed moving powder can be broken under the impact of the grinding plate 30 to form powder particles with smaller particle size, thereby improving the grinding efficiency of the steam grinding equipment.

[0031] The grinding chamber 10 includes a grading zone 12, a transition zone 13, a feed grinding zone 14 and a waste zone 15 arranged in sequence from top to bottom; wherein the grading zone 12 and the feed grinding zone 14 are cylindrical, and the inner diameter D of the grading zone 12 is 1 Greater than the inner diameter D of the feed grinding zone 14 0 Specifically, the inner diameter D of the classification zone 12 1 is the inner diameter D of the feed grinding zone 14 0The transition zone 13 and the waste zone 15 are inverted cones, and the waste zone 15 has a waste port 15a at the bottom; unqualified powder waste deposited at the bottom of the waste zone 15 is finally discharged from the outside of the grinding chamber 10 through the waste port 15a.

[0032] Since the spraying direction of the nozzle 11 is set to be inclined upward, the powder particles flowing downward are less, and the cavity of the waste area 15 under the nozzle 11 can be reduced. In an optional embodiment, the cone angle α of the waste area 15 1 The cone angle of the waste zone 15 is greater than 150°, for example, the cone angle of the waste zone 15 is 160° or higher, which can reduce the height of the waste zone 15. The nozzle 11 is located close to the waste zone 15, for example, the distance between the bottom of the nozzle 11 and the top of the waste zone 15 is between 1-20 mm. Since the height of the waste zone 15 is small and it is close to the nozzle 11, the powder in the waste zone 15 can be easily carried back to the collision zone by the flow field near the nozzle 11 for collision, so that the originally useless retained powder has the opportunity to become a qualified product.

[0033] Specifically, the angle β between the spray direction of the nozzle 11 and the longitudinal centerline direction of the grinding chamber 10 is 1 The angle is between 30° and 45°, and the grinding plate 30 is located in the feed grinding area 14 .

[0034] Specifically, the structure and installation method of the grinding plate 30 are not unique; in a specific embodiment, Figure 1 , Figure 2 As shown, an annular grinding plate 30 is disposed inside the grinding chamber 10 and surrounds the longitudinal center line of the grinding chamber 10 , and is snap-connected to the circumferential side wall of the grinding chamber 10 .

[0035] In another specific embodiment, Figure 3 , Figure 4 As shown, the number of the grinding plates 30 is consistent with the number of the nozzles 11, and they are arranged one by one with the nozzles 11. For example, the nozzles 11 are evenly arranged with 4 pieces along the circumference, and the grinding plates 30 are arranged with 4 pieces correspondingly. The grinding plates 30 are shaped into rectangles, circles or ellipses. The geometric center position of the grinding plate 30 is located on the injection center line of the nozzle 11 on the opposite side. The area of ​​the grinding plate 30 is larger than the nozzle area of ​​the nozzle 11 arranged on the opposite side. For example, the area of ​​the grinding plate 30 is larger than twice the nozzle area, and has covered the scattering range of the nozzle 11.

[0036] Specifically, the grinding plate 30 is detachably mounted on the inner wall of the grinding chamber 10. Figure 2 , Figure 4As shown, in an optional embodiment, a mounting seat 16 is provided on the inner wall of the grinding chamber 10, and a deformable claw is provided on the mounting seat 16. The grinding plate 30 is clamped on the deformable claw of the mounting seat 16, and the grinding plate 30 can be removed and replaced by pulling the claw.

[0037] Specifically, in an optional implementation manner, Figure 1-Figure 4 As shown, the feed grinding area 14 of the grinding chamber 10 also includes a deceleration ring 40, which is connected to the pressure gas supply pipeline, and a plurality of first gas outlets 40a are provided on the upper side of the deceleration ring 40, and the spray direction of the first gas outlet 40a points to the longitudinal center line of the grinding chamber 10. When working, the deceleration ring 40 can spray high-pressure gas upward, which can reduce the downward speed of the powder, avoid the high-speed running powder from impacting the bottom wall of the grinding chamber 10, and improve the service life of the grinding chamber 10. At the same time, some of the falling powder particles return to the collision zone again for collision under its action, reducing the amount of powder going down and improving the grinding efficiency of the steam mill.

[0038] Specifically, the injection direction of the first air outlet 40a of the deceleration ring 40 is inclined upward by 30°-50° relative to the horizontal direction. The injection gas speed is preferably 1m / s-10m / s, and the outer diameter of the deceleration ring 40 is 0.42-0.65 times the inner diameter of the grinding chamber 10 in which it is located. The deceleration ring 40 is arranged on the lower side of the collision point of the nozzle 11 (i.e., the intersection of the injection center lines of different nozzles 11), and is 50mm-200mm away from the collision point.

[0039] Specifically, in an optional implementation manner, Figure 1-Figure 4 As shown, a purge ring 50 is arranged in the feed grinding area 14 of the grinding chamber 10, the purge ring 50 is connected to the pressure gas supply pipeline, and a plurality of second gas outlets 50a are arranged on the lower side of the purge ring 50, and the spray direction of the second gas outlets 50a points to the side wall of the waste area 15. The purge ring 50 can spray high-pressure gas toward the side wall of the waste area 15 to flow the retained powders at the corners, so that they re-enter the flow cycle of the entire chamber.

[0040] The inclined spraying direction of the purge ring 50 is inclined downward by 5° to 45° relative to the horizontal direction, and its spraying speed is preferably 0.5-5m / s. The outer diameter of the purge ring 50 is 0.8-0.95 times the inner diameter of the grinding chamber 10 in which it is located, and its arrangement height should be just 0-20mm above the waste area 15 to achieve dead-angle purge of the purge ring 50.

[0041] 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 steam mill, comprising a grinding chamber, at least two nozzles are arranged on the side wall of the grinding chamber, a grading area is arranged on the upper side of the grinding chamber, and a grading device is arranged in the grading area; characterized in that: The spray direction of the nozzle is inclined upward relative to the horizontal direction. At least one grinding plate is arranged inside the grinding chamber. The grinding plate is close to the inner wall of the grinding chamber and its plate surface is arranged opposite to the nozzle opening of the nozzle. The airflow ejected from the nozzle flows to the grinding plate under the action of inertia force.

2. A steam mill according to claim 1, characterized in that: A grinding plate is arranged inside the grinding cavity. The grinding plate is formed into an annular plate body and is installed on the circumferential side wall of the grinding cavity.

3. A steam mill equipment according to claim 2, characterized in that: The number of the grinding plates is consistent with the number of the nozzles and is arranged in one-to-one correspondence with the nozzles. The area of ​​the grinding plate is larger than the nozzle area of ​​the nozzle arranged on the opposite side thereof.

4. A steam mill according to any one of claims 1 to 3, characterized in that: The grinding plate is detachably mounted on the inner wall of the grinding chamber.

5. A steam mill according to claim 1, characterized in that: The grinding chamber comprises a feed grinding zone located at the lower side, the inner diameter of the feed grinding zone is smaller than the inner diameter of the grading zone, and the feed grinding zone and the grading zone are connected and transitioned through a transition zone.

6. A steam mill according to claim 5, characterized in that: The nozzle is located at the lower side of the feed grinding zone, and the angle between the spraying direction of the nozzle and the longitudinal center line direction of the grinding chamber is between 30° and 45°.

7. A steam mill according to claim 5, characterized in that: The grinding plate is located in the feed grinding area.

8. A steam mill according to claim 5, characterized in that: A deceleration ring is also arranged in the feed grinding area, the deceleration ring is connected with the pressure gas supply pipeline, a plurality of first air outlets are arranged on the upper side of the deceleration ring, and the spraying direction of the first air outlets points to the longitudinal center line of the grinding chamber.

9. A steam mill according to claim 5, characterized in that: The grinding chamber includes a waste area located at the lower side of the feed grinding area, the waste area is an inverted cone, a waste port is arranged at the bottom of the waste area, a purge ring is arranged in the feed grinding area or the waste area, the purge ring is connected to the pressure gas supply pipeline, a plurality of second air outlets are arranged on the lower side of the purge ring, and the injection direction of the second air outlet is directed to the side wall of the waste area.

10. A steam mill according to claim 9, characterized in that: The cone angle of the waste zone is greater than 150°.

Images