Vertical mill millstone blowing device
By blowing up the material at the base of the stopper ring with high pressure and high speed air in the vertical mill, the problem of over-grinding of the materials in the vertical mill is solved, which improves output and reduces power consumption, while ensuring the stability and durability of the device.
Patent Information
- Application Number
- CN202421251808.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The material at the root of the retaining ring in the vertical mill cannot be thrown out in time, resulting in multiple grinding, resulting in low mill output and high power consumption.
High-pressure and high-speed air are used to blow up the material at the root of the grinding disc material ring, and sort through the air spray pipe and high-pressure fan to reduce the over-grinding of the material.
It effectively reduces material over-grinding, improves mill production, reduces power consumption, and the design of the blowing device avoids direct contact, reduces wear, and ensures long-term stable operation.
Smart Images
Figure CN222816949U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of vertical roller mill powder grinding, in particular to a vertical mill grinding disc blowing device. 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 crushed materials 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 the 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 plate, 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 enter the powder separator for sorting. Since a certain height of the retaining ring is set on the outside of the grinding disc, it is used to form a certain material layer thickness to ensure the stability during rolling and grinding.
[0003] Since the material at the root of the retaining ring is blocked, it cannot be thrown out in time under the action of centrifugal force, and is squeezed out after being crushed by the grinding roller for many times. This causes this part of the material to be over-grinded, resulting in low mill output and high power consumption. Now some manufacturers have added an inclined guide plate behind the grinding roller to guide the material at the root of the retaining ring through the guide plate and enter the air ring for selection. However, this structure has the problem of rapid wear and tear and cannot maintain operation for a long time. At the same time, there is a safety hazard that the guide plate will fall off, causing damage to the mill. Summary of the invention
[0004] In order to solve the problem that the root material of the existing vertical mill retaining ring cannot be eliminated and is ground multiple times, resulting in over-grinding of the mill, low output and high power consumption, the present invention discloses a vertical mill grinding disc blowing device, which uses high-pressure and high-speed wind to blow up the root material of the grinding disc retaining ring in time for sorting, thereby reducing the problem of over-grinding of the material caused by the root material being repeatedly ground by the grinding roller, improving the mill output and reducing the mill power consumption.
[0005] A vertical mill grinding disc blowing device comprises a high-pressure fan, an air inlet pipeline and an air jet pipe; wherein the high-pressure fan is connected to a branch air pipe through a main air pipe, wherein the branch air pipe has two outlets respectively connected to two inlets of the air jet pipe; the air jet pipe is composed of a pipeline and a nozzle speed regulating device; the nozzle speed regulating device comprises a rotating shaft, a top plate, a speed regulating plate, a top screw and a side plate; a semicircular groove is cut at the outlet of the pipeline, wherein a closed outlet is formed by the top plate, the side plate and the speed regulating plate; wherein the speed regulating plate is welded to the rotating shaft and rotates with the rotating shaft, and the rotating shaft and the side plate are hinged; a top screw is fixed on the top plate; after the top screw is screwed in, the speed regulating plate can be supported and rotated inwards, thereby reducing the outlet area of the air jet pipe and increasing the air speed of the nozzle.
[0006] Furthermore, in order to blow up the material at the root of the retaining ring in time, the air jet pipe needs to be set to one end of the grinding roller discharge; one end of the air jet pipe extends to one end of the grinding roller discharge; the angle a between the center line of the air jet ring and the center line of the grinding roller is 20-30 degrees; the height h of the outlet of the air jet pipe from the grinding disc liner is 300-400mm. The distance L between the side of the air jet pipe and the inner side of the retaining ring is 20-40mm.
[0007] Further, the high pressure fan is fixed on the ground or the concrete frame.
[0008] Furthermore, the main air duct is fixed on the mill housing.
[0009] The working principle of the utility model is as follows: the top wire is adjusted according to the particle size of the grinding material, and the appropriate wind speed at the outlet of the air jet pipe is adjusted. Then the mill is operated, and the grinding disc rotates to evenly disperse the material on the disc body, and a certain material layer is formed under the action of the material retaining ring. After the material is crushed by the grinding roller, it is thrown out from the upper part of the material retaining ring. Due to the obstruction of the material retaining ring, the material at the root of the material retaining ring is not thrown out. After being ground by the grinding roller behind, when it passes through the blowing device, the high-pressure wind provided by the high-pressure fan is ejected from the air jet pipe at high speed, blowing up the finished material at the root of the material retaining ring, sorting, and circulating in sequence. The number of blowing devices can also be set to 2 according to different materials to further reduce over-grinding of materials.
[0010] Beneficial effects of the utility model:
[0011] 1. The present invention adopts high-pressure and high-speed wind to blow up the material at the root of the grinding disc retaining ring in time for sorting, thereby reducing the problem of over-grinding of the material caused by the root material being repeatedly circulated and ground by the grinding roller, increasing the output of the mill and reducing the power consumption of the mill.
[0012] 2. The blowing device of the present invention has no direct contact with the grinding disc material, so the wear is small and the device can operate stably and continuously for a long time. At the same time, the wind speed of the air jet pipe can be adjusted by the top screw to adapt to the blowing of materials of different particle sizes. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is the front view of the utility model;
[0014] Figure 2 It is the AA section view of the main view of this utility model;
[0015] Figure 3 It is the DD section view of the main view of this utility model;
[0016] Figure 4 This is a practical main view Figure 3 BB cross-section diagram;
[0017] Figure 5 It is a practical main view Figure 3 CC profile of ;
[0018] List of reference numerals:
[0019] Among them, 1-high pressure fan; 2-air inlet pipe; 3-powder spraying pipe; 4-grinding roller; 5-grinding disc; 6-mill middle shell; 7-material at the root of the retaining ring; 2a-main air duct; 2b-division air duct; 3a-pipeline; 3b-rotating shaft, 3c-top plate, 3d-speed regulating plate, 3e-top screw, 3f-side plate. DETAILED DESCRIPTION
[0020] 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.
[0021] A vertical mill grinding disc blowing device of this embodiment includes a high-pressure fan 1, an air inlet pipeline 2 and an air injection pipe 3; Figure 1 As shown in the figure, the grinding roller 4, the grinding disc 5, the mill housing 6, and the material 7 at the root of the retaining ring are schematic diagrams of the conventional structure of the vertical mill. The grinding disc 5 rotates to evenly distribute the material on the disc body. Due to the action of the outer retaining ring, a certain thickness of material layer accumulates on the grinding disc. After being ground by the grinding roller, the ground material is thrown out from the upper part of the retaining ring for sorting. At the same time, due to the obstruction of the retaining ring, the material 7 at the root of the retaining ring cannot be discharged in time.
[0022] like Figure 2-5 As shown, the high-pressure fan 1 of the present invention is fixed on the ground or concrete frame, and guides the high-pressure air to the two outlets of the spray pipe 3 through the air inlet pipeline. The main air pipe 2a is fixed on the mill housing and then connected to the branch air pipe 2b, which has two outlets connected to the two inlets of the spray pipe 3.
[0023] The air jet pipe 3 is composed of a pipe 3a and a nozzle speed regulating device; the nozzle speed regulating device includes a rotating shaft 3b, a top plate 3c, a speed regulating plate 3d, a top screw 3e, and a side plate 3f; a semicircular groove of a certain depth is cut at the outlet of the pipe 3a, wherein the top plate 3c, the side plate 3f, and the speed regulating plate 3d form a closed outlet; wherein the speed regulating plate 3d is welded to the rotating shaft 3b and rotates with the rotating shaft 3b, and the rotating shaft 3b and the side plate 3f are hinged; a top screw 3e is fixed on the top plate 3c. After the top screw is screwed in, the speed regulating plate can be supported and rotated inward, thereby reducing the outlet area of the air jet pipe and increasing the air velocity of the nozzle.
[0024] In order to blow up the material at the root of the retaining ring in time, the air jet pipe 3 needs to be set to the end of the grinding roller discharge. The angle a between the center line of the air jet ring and the center line of the grinding roller is 20-30 degrees. The height h of the air jet pipe outlet from the grinding disc liner is 300-400mm. The distance L between the side of the air jet pipe and the inner side of the retaining ring is 20-40mm. Specific embodiments
[0025] According to the particle size of the grinding material, adjust the top wire 3e and adjust the appropriate outlet wind speed of the air jet pipe 3. Then the mill is running, and the grinding disc 5 rotates to evenly disperse the material on the disc body, and a certain material layer is formed under the action of the material retaining ring. After being crushed by the grinding roller, the material is thrown out from the upper part of the material retaining ring. Due to the obstruction of the material retaining ring, the material at the root of the material retaining ring is not thrown out. After being ground by the grinding roller behind, when passing through the blowing device, the high-pressure wind provided by the high-pressure fan 1 is ejected from the air jet pipe 3 at high speed, blowing up the material 7 at the root of the material retaining ring for sorting, and then circulating in sequence. The number of blowing devices can also be set to 2 according to different materials to further reduce over-grinding of materials.
[0026] 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 vertical mill grinding disc blowing device, characterized in that: The invention comprises a high-pressure fan (1), an air inlet pipeline (2) and an air jet pipe (3); wherein the high-pressure fan (1) is connected to an air branch pipe (2b) via a main air pipe (2a), wherein the air branch pipe (2b) has two outlets respectively connected to two inlets of the air jet pipe (3); the air jet pipe (3) is composed of a pipe (3a) and a nozzle speed regulating device; the nozzle speed regulating device comprises a rotating shaft (3b), a top plate (3c), a speed regulating plate (3d), a top screw (3e) and a side plate (3f); a semicircular groove is cut out at the outlet of the pipe (3a), wherein the top plate (3c), the side plate (3f) and the speed regulating plate (3d) form a closed outlet; wherein the speed regulating plate (3d) is welded to the rotating shaft (3b) and rotates with the rotating shaft (3b), and the rotating shaft (3b) and the side plate (3f) are hinged; and a top screw (3e) is fixed to the top plate (3c).
2. A vertical mill grinding disc blowing device according to claim 1, characterized in that: One end of the air jet pipe (3) extends to one end of the grinding roller (4) where materials are discharged; and an angle a between a center line of the air jet ring and a center line of the grinding roller is 20 to 30 degrees.
3. The vertical mill grinding disc blowing device according to claim 1 is characterized in that: The outlet of the air jet pipe (3) is at a height h of 300 to 400 mm from the grinding disc liner; the side edge of the air jet pipe (3) is at a distance L of 20 to 40 mm from the inner side of the retaining ring.
4. The vertical mill grinding disc blowing device according to claim 1, characterized in that: The high pressure fan (1) is fixed on the ground or on a concrete frame.
5. The vertical mill grinding disc blowing device according to claim 1, characterized in that: The main air duct (2a) is fixed on the mill housing (6).