A kind of vertical mill dynamic and static combined low resistance wind ring
By adopting a low hindrance ring design combining dynamic and static in the vertical mill and using the static air guide plate to distribute the wind speed, the large pressure loss problem caused by the high wind speed of the vertical mill wind ring is solved, and the effects of low voltage loss and low power consumption are achieved.
Patent Information
- Application Number
- CN202421328657.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-12
AI Technical Summary
The high wind speed at the existing vertical wind ring leads to large pressure loss, and the method of reducing the pressure loss by adjusting the angle of the wind ring is not effective.
The low-blocking ring design combining dynamic and static is adopted, including a static air guide plate and a rotating air ring. The static air guide plate increases the wind speed component to the center of the grinding disc to reduce the situation where larger particulate materials fall vertically into the wind ring, and reduce the wind speed of the wind ring.
On the premise of controlling the outer displacement of the vertical mill, the low-wind ring speed operation is achieved, reducing the mill pressure loss and fan power consumption, and extending the service life of the wind ring.
Smart Images
Figure CN222739293U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of vertical roller mill powder grinding, in particular to a dynamic and static combined low-resistance wind ring of a vertical mill. Background Art
[0002] Vertical mills are widely used in cement, ore and non-metallic grinding fields. They are recognized by the market for their compact structure and low power consumption. The motor drives the grinding disc to rotate, and then drives the grinding roller pressed on the grinding disc to rotate, so as to cyclically grind the materials on the grinding disc. The materials crushed on the grinding disc are thrown out of the grinding disc under the action of centrifugal force, and then fall into the air duct. After being blown and selected by high-speed wind at the wind ring of the air duct, large particles fall into the air duct and are scraped out by the grinding disc scraper, enter the external circulation system of the vertical mill, and then enter the vertical mill for grinding again. The fine particles are blown up and brought back to the mill, and some of the larger particles settle on the grinding disc for grinding again, and the fine particles enter the powder concentrator for sorting.
[0003] Since the circulation volume of the vertical mill external circulation system is limited, it is generally necessary to control the external discharge volume through the appropriate wind ring wind speed. The wind ring is now fixed on the air duct and is in a static state. The wind speed at the wind ring outlet is 50~60m / s, while the wind speed at other parts of the mill is generally below 10m / s. Therefore, most of the pressure loss inside the mill now comes from the wind ring. In order to reduce the internal pressure loss of the mill and reduce the power consumption of the fan, many factories have tried different angles of the wind ring, but none of them have effectively reduced the pressure loss at the wind ring. Summary of the invention
[0004] In order to solve the problem of large pressure loss due to high wind speed in the existing vertical mill air ring, the present invention discloses a dynamic and static combined low-resistance air ring of a vertical mill, which realizes low air ring wind speed operation under the premise of controlling the vertical mill external displacement, thereby reducing the pressure loss of the mill.
[0005] A low-resistance wind ring for a vertical mill combining static and dynamic operation, comprising a static wind guide plate, a cover plate and a rotating wind ring arranged in sequence from top to bottom; wherein an air duct is fixed between the grinding disc and the frame, and the static wind guide plate is fixed at the top of the wind duct; wherein the static wind guide plate comprises an inclined cone and a plurality of fixed plates fixed on the outer circumference of the inclined cone and evenly distributed, wherein the rotating wind ring and the grinding disc are fixed as a whole; wherein the rotating wind ring is a cavity that passes through from top to bottom, and is composed of a top plate, a fastening plate, an outer ring plate, a support plate and an inner ring plate; a plurality of support plates are welded evenly distributed circumferentially between the outer ring plate and the inner ring plate; wherein the top plate is processed on the top surface after welding to ensure that there are upper and lower gaps between the top plate and the cover plate; the fastening plate is welded to the top of the inner ring plate, wherein the fastening plate and the grinding disc are fixed as a whole by bolts.
[0006] Furthermore, the fixing plate is rectangular.
[0007] Furthermore, the angle c between the inclined cone section and the horizontal plane is between 60 and 80 degrees. When the wind brings the material to the static air guide plate, the static air guide plate will add a wind speed component toward the center of the grinding disc. This component will bring the material to the top of the grinding disc, which is conducive to the sedimentation of larger particles on the grinding disc and then being ground. This reduces the situation where the larger particles flying vertically upward fall into the wind ring again, and reduces the demand for the wind speed of the wind ring to control the mill's external discharge volume.
[0008] Furthermore, the support plate is welded at angles a and b; the angle b between the support plate and the center of the rotating air ring is 15 to 35 degrees; and the angle a formed by one end of the support plate and the inner ring plate when welded is 55 to 70 degrees.
[0009] The design of angle a can make the material thrown out by the grinding disc slide down along the support plate, increasing the residence time of the material and fully being blown and selected by the wind ring. On the other hand, the inclined rotating support plate will blow upward, increasing the relative speed of the wind and the material, and reducing the actual wind speed of the wind ring while achieving the purpose of blowing up fine particles. Due to inertia, the ground material is easy to fall to the outside of the support plate when it is thrown out, and the design of angle b allows the material on the support plate to slide from the outside to the inside, so that it is evenly distributed on the entire support plate, increasing the uniformity of blowing. The fastening plate is welded to the top of the inner ring plate, and it is fixed to the grinding disc by bolts.
[0010] The working principle of the present invention is as follows: after the material on the grinding disc is crushed by the grinding roller and thrown out, it falls to the outside of the wind ring support plate under the action of inertia, and then slides freely downward while sliding inward to be evenly dispersed. Then the wind ring wind upward relative to the support plate blows up the fine particles on the support plate, and then, under the action of the upper static wind guide plate, a wind speed component toward the center of the grinding disc is added to the wind, and this component will bring the material to the top of the grinding disc. The larger particles settle on the grinding disc and are ground again, and the fine particles are blown up through the middle shell and enter the powder classifier for sorting. The large particles that are not blown up from the wind ring will enter the external circulation system of the vertical mill system and return to the mill for grinding again.
[0011] Beneficial effects of the utility model:
[0012] 1. The present invention adopts a combined design of a dynamic wind ring and a static wind guide plate, which realizes low wind ring wind speed operation under the premise of controlling the vertical mill's external displacement, reduces the mill's pressure loss, and reduces the fan's power consumption.
[0013] The dynamic air ring of the present invention rotates with the grinding disc, and the material has a consistent circumferential speed relative to the air ring support plate when being thrown out, thereby reducing the impact of the material on the air ring support plate, reducing the wear of the air ring support plate, and increasing the service life of the air ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is the front view of the utility model;
[0015] Figure 2 It is a partial enlarged view of the main view of this utility model;
[0016] Figure 3 It is the front view of the utility model No. 3;
[0017] Figure 4 It is the AA cross-sectional view of the utility model serial number 3;
[0018] Figure 5 It is a BB cross-sectional view of the utility model serial number 3;
[0019] Figure 6 It is an axial view of serial number 3 of the utility model.
[0020] List of reference numerals:
[0021] Among them, 1-static air guide plate, 2-cover plate, 3-rotating air ring, 4-middle shell; 5-rocker arm; 6-grinding roller; 7-grinding disc; 8-air duct; 9-frame; 1a-inclined cone; 3a-top plate, 3b-fastening plate, 3c-outer ring plate, 3d-support plate, 3e-inner ring plate. DETAILED DESCRIPTION
[0022] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.
[0023] A dynamic and static combined low-resistance wind ring of a vertical mill in this embodiment comprises a static wind guide plate 1, a cover plate 2 and a rotating wind ring 3 arranged in sequence from top to bottom; Figure 1 As shown, the middle shell 4, rocker arm 5, grinding roller 6, grinding disc 7, air duct 8 and frame 9 are schematic diagrams of the conventional structure of the vertical mill. The frame 9 is fixed on the ground, and a rocker arm 5 is fixed on the frame. The rocker arm 5 and the grinding roller 6 are hinged, and the grinding roller can be turned up and down along the center of the rocker arm with the rocker arm. The grinding disc is connected to the reducer and can rotate along the axis. An air duct 8 is fixed between the grinding disc and the frame, and hot air flows from the outside to the inside of the air duct 8. The air duct 8 is fixed on the frame 9. The middle shell 4 is wrapped around multiple grinding rollers on the circumference, and the upper part of the middle shell 4 is connected to a powder selector.
[0024] like Figure 2As shown, the static air guide plate 1 is fixed on the top of the air duct 8, including an inclined cone 1a and a plurality of fixed plates 1b fixed on the outer circumference of the inclined cone 1a, the fixed plate 1b is rectangular, and the angle c at the cross section of the inclined cone 1a is 60-80 degrees. When the wind belt material blows to the static air guide plate 1, the static air guide plate 1 will add a wind speed component toward the center of the grinding disc to the wind, which will bring the material to the top of the grinding disc, which is conducive to the sedimentation of the larger particles on the grinding disc and then being ground, thereby reducing the situation where the larger particles vertically upward fall into the wind ring again, and reducing the demand for the wind ring wind speed to control the mill discharge.
[0025] At the same time, the rotating air ring 3 and the grinding disc 7 are fixed together and rotate with the grinding disc 7. The rotating air ring includes a top plate 3a, a fastening plate 3b, an outer ring plate 3c, a support plate 3d, and an inner ring plate 3e. Multiple components are welded together to form a cavity that is connected from top to bottom and closed from left to right. The top plate 3a is processed on the top surface after welding to ensure the upper and lower gaps between it and the cover plate 2, to ensure the sealing effect at the fitting point, and to prevent the gaps from being different in size and causing material jams.
[0026] A plurality of support plates 3d are welded uniformly around the outer ring plate 3c and the inner ring plate 3e. Figure 5 The angles a and b are welded. The angle a is 55-70 degrees, and the angle b is 15-35 degrees. The design of angle a, on the one hand, allows the material thrown out by the grinding disc to slide down along the support plate, increasing the residence time of the material and allowing it to be fully blown and selected by the wind ring. On the other hand, the inclined rotating support plate will blow the wind upward, increasing the relative speed of the wind and the material, and reducing the actual wind speed of the wind ring while achieving the purpose of blowing up fine particles. Due to inertia, the ground material is easy to fall to the outside of the support plate when it is thrown out, and the design of angle b allows the material on the support plate to slide from the outside to the inside, thereby being evenly distributed on the entire support plate, increasing the uniformity of blowing. The fastening plate is welded to the top of the inner ring plate, and it is fixed to the grinding disc by bolts.
[0027] During the specific implementation operation: after the material on the grinding disc 7 is crushed by the grinding roller 6 and thrown out, it falls to the outside of the support plate 3d of the rotating air ring 3 under the action of inertia, and then slides freely downward while sliding inward to be evenly dispersed. Then the upward wind relative to the support plate 3d blows up the fine particles on the support plate, and then under the action of the upper static air guide plate, a wind speed component toward the center of the grinding disc is added to the wind, and this component will bring the material to the top of the grinding disc 7. Among them, the larger particles settle on the grinding disc 7 and are ground again, and the fine particles are blown up through the middle shell 4 to enter the powder selection machine for sorting. The large particles that are not blown up from the rotating air ring 3 will enter the external circulation system of the vertical mill system and return to the mill for grinding again. Since the support plate 3d rotates with the grinding disc, the linear speed is 12~18m / s, which will increase the relative wind speed of the material and the wind. For example, if a certain external discharge volume is actually controlled and a wind speed of 50 m / s is required, the actual wind speed of the wind ring of the present invention is only 32-38 m / s. Since the pressure difference is proportional to the square of the wind speed, the actual pressure loss at the wind ring can be reduced by more than 40%, which greatly reduces the pressure loss of the mill and thus reduces the power consumption of the fan.
[0028] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.
Claims
1. A dynamic and static combined low-resistance wind ring for a vertical mill, characterized by: The invention comprises a static air guide plate (1), a cover plate (2) and a rotating air ring (3) which are arranged in sequence from top to bottom; wherein an air duct (8) is fixed between a grinding disc (7) and a frame (9); the static air guide plate (1) is fixed to the top of the air duct (8); wherein the static air guide plate (1) comprises an inclined cone (1a) and a plurality of fixed plates (1b) fixed to the outer circumference of the inclined cone (1a) and evenly distributed; wherein the rotating air ring (3) and the grinding disc (7) are fixed as a whole; wherein the rotating air ring (3) is an upper, The cavity is formed by a top plate (3a), a fastening plate (3b), an outer ring plate (3c), a support plate (3d) and an inner ring plate (3e); a plurality of support plates (3d) are welded uniformly around the circumference between the outer ring plate (3c) and the inner ring plate (3e); the top surface of the top plate (3a) is processed after welding to ensure that there are upper and lower gaps between the top plate (3a) and the cover plate (2); the fastening plate (3b) is welded to the top of the inner ring plate (3e), wherein the fastening plate (3b) and the grinding disc (7) are fixed together by bolts.
2. The dynamic and static combined low-resistance wind ring of a vertical mill according to claim 1, characterized in that: The fixing plate (1b) is rectangular.
3. The dynamic and static combined low-resistance wind ring of a vertical mill according to claim 1 is characterized by: The angle c between the cross section of the inclined cone (1a) and the horizontal plane is between 60 and 80 degrees.
4. The dynamic and static combined low-resistance wind ring of a vertical mill according to claim 1 is characterized by: When the support plate (3d) is welded, the included angle b between the support plate (3d) and the center of the rotating air ring (3) is 15 to 35 degrees; wherein when the support plate (3d) is welded, the included angle a between one end of the support plate (3d) and the inner ring plate (3e) is 55 to 70 degrees.