Folding activation ring device for a cement mill
By employing a folded activation ring device in the cement mill, and utilizing a V-shaped flow channel and sieve plate design, the problems of low grinding efficiency and clogging in traditional cement grinding have been solved, achieving efficient grinding and stable particle size distribution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 山东信贶节能环保有限公司
- Filing Date
- 2025-05-29
- Publication Date
- 2026-07-14
AI Technical Summary
In traditional cement grinding processes, the material slides and moves with the grinding media under centrifugal force in the flat plate activation device, resulting in low grinding efficiency, easy clogging, and high energy consumption, which affects the stability of particle size distribution and product strength.
The device employs a folded activation ring, which forms a V-shaped flow channel through multiple activation liner structures. It utilizes disturbance components to increase the movement range and impact of the grinding media, and combines this with a sieve plate design to extend the material grinding time, thus avoiding clogging and heat accumulation.
It improves grinding efficiency, reduces energy consumption, ensures particle size distribution stability and product strength, and avoids over-grinding and clogging.
Smart Images
Figure CN224486167U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cement grinding equipment, specifically a folded activation ring device for cement grinding. Background Technology
[0002] Traditional cement grinding processes typically involve installing an annular activation device (also known as a compartment) on the inner wall of the grinding mill cylinder to extend the material residence time by dividing the grinding chambers, thereby improving the grinding effect.
[0003] For example, a flat plate activation device is shown in a mill anti-clogging activation liner with patent application number CN202320936496.8. The activation device includes a top plate connected to the inner wall of the cylinder on one side and a flat plate partition (composed of a side plate and a sieve plate) vertically disposed on the other side of the top plate. In use, multiple activation devices are installed on the inner wall of the cylinder to form a ring-shaped compartment inside the cylinder.
[0004] However, during use, it was found that this flat plate activation device has significant defects: under the centrifugal force generated by the rotation of the cylinder, the material and grinding media mainly slide along the cylinder wall and are difficult to be effectively spread, which weakens the impact crushing effect between the grinding media and the material and reduces the grinding efficiency; at the same time, the material flow of the flat plate baffle lacks dynamic guidance ability, which easily causes material accumulation and blockage in the discharge port area, inducing over-grinding and accompanied by the accumulation of frictional heat. This not only increases energy consumption, but also causes the temperature of the cement product to rise abnormally, thereby affecting the stability of particle size distribution and the strength index of the product. Utility Model Content
[0005] To address the technical problems existing in the background art, this utility model provides a cement mill folded activation ring device.
[0006] The technical solution of this utility model is as follows:
[0007] A cement mill folded activation ring device includes multiple activation liner structures, which are arranged in a ring array to form a ring. Each activation liner structure includes an arc-shaped mounting plate and two sets of disturbance components vertically arranged along one side of its radial center. The two sets of disturbance components are arranged at an angle to form a V-shaped flow guide structure.
[0008] Furthermore, the disturbance component includes two support rods and a screen plate between them. The screen plate is located at one end of the two support rods near the radial center of the mounting plate, and the screen plate and the two support rods together with the mounting plate form a grinding body passage. The material-facing surface of the screen plate is a guide surface, and it is provided with several through screen holes.
[0009] That is, this application replaces the traditional planar activation ring structure with a folded activation ring structure formed by a ring array of multiple folded activation liner structures. By "folding" and fixing two adjacent sets of disturbance components together, multiple V-shaped flow channels are formed. Under the action of centrifugal force, the grinding media can be forced to be thrown up towards the flow surface of each inclined screen plate. Compared with the traditional planar activation ring structure, the movement area of the grinding media is increased, the impact between the grinding media and the material is increased, and thus the grinding efficiency is improved.
[0010] As one implementation method, the included angle between the two sieve plate guide surfaces of the activated liner structure is 30°-120°.
[0011] Furthermore, the width of the grinding media along the length of the sieve plate is 1 / 3 to 1 / 2 of the sieve plate length.
[0012] Furthermore, the sieve holes on the sieve plate near the radial center of the mounting plate are smaller than the sieve holes on the side where the mounting plate is located.
[0013] As one implementation method, the two supports of the disturbance component are distributed in a figure-eight shape, and the distance between the two supports near the radial center of the mounting plate is smaller than the distance on the side where the mounting plate is located.
[0014] Furthermore, the included angle between the two supports of the disturbance component is 5°-15°.
[0015] Furthermore, the included angle between the two sieve plate guide surfaces of the activated liner structure is 55°-65°.
[0016] Preferably, the included angle between the two sieve plate guide surfaces of the activated liner structure is 60°.
[0017] To improve wear resistance and corrosion resistance, the activated liner structure is made of chromium cast iron alloy.
[0018] As one implementation method, the cross-sectional shape of the support rod is circular.
[0019] Preferably, the support rod is connected to the screen plate and the mounting plate by segment welding.
[0020] The beneficial effects of this utility model of a folded activation ring device for a cement mill are as follows:
[0021] 1. The movement range of the grinding media can be expanded by the disturbance effect of the tilting disturbance component. Specifically, under the action of centrifugal force, the grinding media can be forced to be thrown up towards the guide surface of the tilting screen plate. Compared with the traditional planar activated ring structure, the material slides along the cylinder wall. The "folded" structure increases the impact between the grinding media and the material.
[0022] Second, the two sets of disturbance components can also guide the material to flow along the guide surface of the screen plate. Through the design of the screen plate and its screen holes, the screen plate can increase the wind resistance, reduce the flow rate of the material, and extend the grinding time of the material, so that the material can be fully ground. The ground cement powder can also pass through the screen holes, thereby avoiding problems such as over-grinding, clogging and heat accumulation. This achieves reduced energy consumption, improved efficiency, and ensures the stability of particle size distribution and the strength index of the product. Attached Figure Description
[0023] In the attached diagram:
[0024] Figure 1 This is a schematic diagram of the activated liner structure in this embodiment;
[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the disturbance component;
[0026] Figure 3 This is a frontal schematic diagram of a cement mill folded activation ring device in this embodiment;
[0027] The components represented by the various reference numerals in the diagram are:
[0028] 1. Activated liner structure; 11. Mounting plate; 12. Disturbance component; 121. Support rod; 122. Screen plate; 1221. Screen hole; 1222. Guide surface; 123. Grinding media passage. Detailed Implementation
[0029] Combination Figure 1 This embodiment provides a cement mill folded activation ring device, including multiple activation liner structures 1, which are arranged in a ring array to form a ring. Figure 3 .
[0030] In use, the activation ring device is installed on the inner wall of the grinding mill cylinder, and multiple sets are arranged at intervals along the cylinder axis. The end of the grinding mill is also equipped with a circular liner plate. The outer ring of the liner plate is in contact with the inner wall of the cylinder, and the liner plate is also provided with several fine powder holes. On the side of the liner plate away from each activation ring device, a circulating fan connected to the inside of the cylinder is also installed. Each set of activation ring devices is used to grind the material, and the circulating fan is used to suck up the grinding powder inside the cylinder.
[0031] It should be noted that the grinding mill in this embodiment is a commercially available cement particle grinding mill, and the specific structure and working principle of its cylinder, liner and circulating fan will not be described in detail here.
[0032] Regarding the specific structure of the activation ring device, each activation liner structure 1 of the activation ring device includes an arc-shaped mounting plate 11 and two sets of disturbance components 12 vertically arranged along one side of its radial center. The two sets of disturbance components 12 are arranged at an angle to form a V-shaped flow guide structure and are installed on the inner wall of the grinding mill cylinder through the mounting plate 11. The side of the mounting plate 11 facing away from the radial center cooperates with the inner wall of the grinding mill cylinder.
[0033] Combination Figure 2 Specifically, the disturbance component 12 includes two support rods 121 and a screen plate 122 between them. The screen plate 122 is located at one end of the two support rods 121 near the radial center of the mounting plate 11, and the screen plate 122 and the two support rods 121 together with the mounting plate 11 form a grinding body passage 123. The material-facing surface of the screen plate 122 is a flow guide surface 1222, which is provided with a number of through screen holes 1221.
[0034] That is, this application replaces the traditional planar activation ring structure with a folded activation ring structure formed by a ring array of multiple folded activation liner structures 1. By "folding" and fixing two adjacent groups of disturbance components 12 together, multiple V-shaped flow channels are formed. Under the action of centrifugal force, the grinding media can be forced to be thrown up towards the flow surface 1222 of each inclined screen plate 122. Compared with the traditional planar activation ring structure, the movement area of the grinding media is increased, the impact between the grinding media and the material is increased, and thus the grinding efficiency is improved.
[0035] During grinding, the cylinder usually rotates at a speed of 16 revolutions per minute. During this process, the grinding media can expand its range of motion under the disturbance of the tilting disturbance component 12. Specifically, under the action of centrifugal force, the grinding media can be forced to be thrown up towards the guide surface 1222 of the tilting screen plate 122, which increases the impact probability between the grinding media and cement particles compared with the traditional planar activated ring structure.
[0036] In addition, the grinding media are usually steel balls, which are more likely to be thrown towards the cylinder wall area due to their large mass. In the grinding environment dominated by centrifugal force, the setting of the grinding media 123 ensures that the steel balls can move smoothly throughout the cylinder. Cement particles, on the other hand, have a smaller mass and are less affected by centrifugal force. Under the collision and rebound between the grinding media and the airflow disturbance, they tend to migrate towards the center of the cylinder.
[0037] Therefore, by combining the design of the sieve plate 122 and its sieve holes 1221, this disturbance component 12 can increase the wind resistance through the sieve plate 122, reduce the flow rate of cement particles, extend the grinding time of cement particles, and enable the cement particles to be fully ground. The ground cement powder can also pass through the sieve holes 1221, avoiding problems such as over-grinding, clogging and heat accumulation. This achieves reduced energy consumption, improved efficiency, and ensures the stability of particle size distribution and the strength index of the product.
[0038] To further improve the grinding effect, the following design was also implemented:
[0039] Combination Figure 1 The included angle between the two sieve plates 122 and the guide surfaces 1222 of the activated liner structure 1 is 30°-120° to adapt to the needs of different grinding stages. For example, when the included angle is smaller (such as 30°-60°), the V-shaped guide structure narrows, which enhances the projection force on the grinding media (steel balls) and improves the impact strength on the material; when the included angle is larger (such as 90°-120°), the guide surface 1222 tends to be flat, which focuses on extending the material residence time.
[0040] Preferably, the included angle between the two sieve plates 1222 guide surfaces 1222 of the activated liner structure 1 is 55°-65°. This range of V-shaped guide structures can effectively expand the throwing range of steel balls, increase the collision probability between steel balls and cement particles, and at the same time avoid excessive concentration of steel balls on the cylinder wall, which would lead to energy waste.
[0041] Preferably, the included angle between the guide surfaces 1222 of the two sieve plates 122 of the activated liner structure 1 is 60°, such as... Figure 1 As shown, this angle allows the trajectory of the steel ball to form an optimal match with the rotation direction of the cylinder, maximizing the utilization of impact energy.
[0042] In some cases, wear-resistant protrusions can also be designed on the guide surface 1222 of the sieve plate 122 to enhance the disturbance to the steel balls.
[0043] Combination Figure 2 The width of the grinding media through the inlet 123 along the length of the sieve plate 122 is 1 / 3 to 1 / 2 of the length of the sieve plate 122, so as to ensure that the speed of the steel balls passing through matches the grinding rhythm, preventing under-grinding due to excessively fast discharge, or accumulation and blockage due to excessively slow discharge.
[0044] The sieve holes 1221 on the sieve plate 122 near the radial center of the mounting plate 11 are smaller than the sieve holes 1221 on the side where the mounting plate 11 is located. That is, the size of the sieve holes 1221 decreases from the outside to the inside. By utilizing the stratification effect of particles in the centrifugal force field, the outer large sieve holes 1221 preferentially release coarse particles and reduce airflow resistance, reduce the risk of blockage and balance the energy consumption of the circulating fan, while the inner small sieve holes 1221 intercept the unqualified fine powder for secondary grinding, prolong the residence time and prevent over-grinding.
[0045] Meanwhile, the outer sieve holes 1221 have high particle impact strength, so using a large aperture can reduce the effective force-bearing area of the sieve plate 122 and disperse the impact stress. The inner small sieve holes 1221 have finer particles and weaker impact force, so the structural strength requirements of the sieve plate 122 are lower. Ultimately, this achieves multiple goals such as efficient sorting and grinding, reduced energy consumption, extended sieve plate 122 life and stable product quality.
[0046] Combination Figure 2The two support rods 121 of the disturbance component 12 are distributed in a figure-eight shape, and the cross-sectional shape of the support rods 121 is circular. The distance between the two support rods 121 near the radial center of the mounting plate 11 is smaller than the distance on the side where the mounting plate 11 is located, forming a diffusion channel on the side near the mounting plate 11 so that the steel ball can pass through efficiently.
[0047] The included angle between the two support rods 121 of the disturbance component 12 is 5°-15°, which makes the overall structure compact and saves space while meeting the requirements of trial use.
[0048] The activated liner structure 1 is made of chromium cast iron alloy. Specifically, high chromium cast iron (Cr 18%-22%) can be selected, with a hardness of 58-62 HRC and a wear rate of ≤0.1 mm / thousand hours, in order to improve wear resistance and corrosion resistance.
[0049] The support rod 121 and the sieve plate 122 are connected by segment welding to reduce welding deformation and stress and improve welding quality. At the same time, if the activated liner is made of chromium cast iron alloy (wear-resistant but with poor thermal conductivity), the low heat input characteristics of segment welding can prevent the chromium cast iron alloy material from becoming brittle due to high-temperature welding, thus improving the overall structural durability.
[0050] like Figure 1 The end of the support rod 121 away from the screen plate 122 is welded to the inner arc surface of the mounting plate 11. To improve the overall structural strength, any two adjacent support rods 121 are welded together. In order to facilitate processing and manufacturing, in the two sets of disturbance components 12, the axis of the two adjacent support rods 121 is perpendicular to the axis of the mounting plate 11, and the two sets of disturbance components 12 are mirror images of each other along the partition surface between the two support rods 121.
Claims
1. A cement mill folding activation ring device, characterized by, It includes multiple activated liner structures (1), and the multiple activated liner structures (1) are arranged in a ring array to form a ring; The activated liner structure (1) includes an arc-shaped mounting plate (11) and two sets of disturbance components (12) arranged vertically along one side of its radial center, and the two sets of disturbance components (12) are arranged at an angle to form a V-shaped flow guide structure; The disturbance component (12) includes two support rods (121) and a sieve plate (122) between them; The sieve plate (122) is located at one end of the two support rods (121) near the radial center of the mounting plate (11), and the sieve plate (122) and the two support rods (121) together with the mounting plate (11) form a grinding body passage (123). The material-facing surface of the sieve plate (122) is a flow guide surface (1222), and it is also provided with several through sieve holes (1221).
2. The cement mill folded activation ring device as described in claim 1, characterized in that, The included angle between the guide surfaces (1222) of the two sieve plates (122) of the activated liner structure (1) is 30°-120°.
3. The cement mill folded activation ring device as described in claim 1, characterized in that, The width of the grinding media through the opening (123) along the length of the sieve plate (122) is 1 / 3 to 1 / 2 of the length of the sieve plate (122).
4. The cement mill folded activation ring device as described in claim 1, characterized in that, The sieve holes (1221) on the sieve plate (122) near the radial center of the mounting plate (11) are smaller than the sieve holes (1221) on the side where the mounting plate (11) is located.
5. The cement mill folded activation ring device as described in claim 1, characterized in that, The two support rods (121) of the disturbance component (12) are arranged in a figure-eight shape, and the distance between the two support rods (121) near the radial center side of the mounting plate (11) is smaller than the distance between the two support rods (121) on the side where the mounting plate (11) is located.
6. The cement mill folded activation ring device as described in claim 5, characterized in that, The included angle between the two support rods (121) of the disturbance component (12) is 5°-15°.
7. A cement mill folding activation ring device as described in any one of claims 1-6, characterized in that, The included angle between the guide surfaces (1222) of the two sieve plates (122) of the activated liner structure (1) is 55°-65°.
8. The cement mill folded activation ring device as described in claim 7, characterized in that, The included angle between the guide surfaces (1222) of the two sieve plates (122) of the activated liner structure (1) is 60°.
9. A cement mill folded activation ring device as described in claim 7, characterized in that, The cross-sectional shape of the support rod (121) is circular.
10. A cement mill folded activation ring device as described in claim 9, characterized in that, The support rod (121) is connected to the sieve plate (122) and the mounting plate (11) by segment welding.