Device for improving vibration of coal mill
By introducing a combination of buffer springs and loading hydraulic cylinders into the coal mill, and using Hall effect sensors to detect overload signals, vibration regulation of the coal mill is achieved. This solves the vibration problem of the coal mill under load fluctuations and the co-firing of inferior coal, improves the stability of the equipment, and reduces power consumption.
Patent Information
- Application Number
- CN202423119483.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Coal mills experience increased vibration, higher power consumption, and severe wear of grinding rollers under load fluctuations and the co-firing of inferior coal, resulting in a high equipment failure rate. Existing technologies are insufficient to effectively buffer small-amplitude vibrations and adjust overload vibrations.
By employing a combination of a buffer spring and a loading hydraulic cylinder, and using a Hall sensor to detect overload signals, the extension length of the loading hydraulic cylinder is controlled to achieve small-amplitude vibration buffering and overload vibration adjustment.
It effectively reduces the vibration amplitude of the coal mill, reduces wear on the grinding rollers, lowers power consumption, and improves equipment stability and reliability.
Smart Images
Figure CN223861941U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal grinding equipment technology, and in particular to a device for improving the vibration of a coal mill. Background Technology
[0002] In recent years, with increasingly fierce competition in the electricity market and continuously rising coal prices, thermal power plants have been increasing the proportion of low-quality coal blended in order to reduce costs. They are also purchasing more and more types of coal based on market fluctuations. Combined with deep peak shaving of the power grid, this has further increased the amplitude and frequency of load fluctuations. This results in greater variation in the type and quantity of coal ground by the coal mills, ultimately leading to unstable operation, increased vibration, increased power consumption, severe wear of grinding rollers, increased equipment failure rate, and increased obstruction of unit power generation. This project focuses on optimizing the loading force and reaction adjustment of the coal mill under the current conditions of significant changes in the coal input and wide load peak shaving. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a device to improve the vibration of a coal mill, which addresses the above-mentioned technical deficiencies. The device uses a buffer spring to buffer small-amplitude vibrations during normal operation. When overload vibration occurs, the extension length of the loading hydraulic cylinder can be controlled to adjust the problem of increased vibration caused by load fluctuations.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a device for improving the vibration of a coal mill, including a coal mill housing, a grinding disc at the bottom of the housing, a grinding roller assembly at the top of the grinding disc, the grinding roller assembly including a roller frame, a grinding roller rotatably connected in the roller frame, one end of the roller frame being hinged to the housing through a hinge shaft, and a buffer spring connected to the other end of the roller frame, a loading hydraulic cylinder being provided on the side of the buffer spring away from the roller frame, the loading hydraulic cylinder being located on the outside of the housing.
[0005] To further optimize this technical solution, the end of the loading hydraulic cylinder is provided with an extension rod, the end of the cylinder is provided with a baffle, the roller frame is provided with a hinge rod at the position corresponding to the buffer spring, the side of the hinge rod corresponding to the roller frame is provided with a limiting platform, and the buffer spring is set between the baffle and the limiting platform.
[0006] To further optimize this technical solution, one end of the hinge rod is slidably inserted through the axis of the baffle. A Hall sensor is provided at the axial end face of the baffle. A magnetic ring is provided at the position corresponding to the hinge rod and the buffer spring. The magnetic ring is coupled to the Hall sensor. The Hall sensor is electrically connected to a controller, which is used to control the working state of the loading hydraulic cylinder.
[0007] To further optimize this technical solution, the buffer spring is a conical helical spring, and a dust cover is provided on the inner side of the buffer spring.
[0008] Compared with the prior art, this utility model has the following advantages: 1. The buffer spring can buffer small-amplitude vibrations during normal operation. When overload vibration occurs, the extension length of the loading hydraulic cylinder can be controlled to adjust the problem of increased vibration caused by load fluctuations; 2. The swing amplitude of the roller frame increases. Under the drive of the roller frame, the hinge rod brings the magnetic ring closer to the Hall sensor to realize the acquisition of overload signals. When the Hall sensor senses the overload signal, the controller realizes the retraction of the loading hydraulic cylinder, which can effectively reduce the adverse effects caused by overload. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of a structure for improving the vibration of a coal mill;
[0010] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;
[0011] Figure 3 This is a cross-sectional view of an improved vibration device for a coal mill, showing the position of a buffer spring.
[0012] In the figure: 1. Grinding roller assembly; 11. Hinge shaft; 12. Roller frame; 13. Grinding roller; 2. Middle housing; 3. Hinge rod; 31. Limiting platform; 32. Magnetic ring; 4. Grinding disc; 5. Buffer spring; 50. Dust cover; 6. Loading hydraulic cylinder; 60. Extension rod; 61. Baffle; 7. Hall sensor. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.
[0014] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" used in this application to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0015] Combination Figures 1 to 3As shown, a device for improving the vibration of a coal mill includes a middle shell 2 of the coal mill. A grinding disc 4 is located at the bottom of the middle shell 2, and a grinding roller assembly 1 is located on the upper part of the grinding disc 4. The grinding roller assembly 1 includes a roller frame 12 and a grinding roller 13. The grinding roller 13 is rotatably connected to the lower side of the roller frame 12. One end of the roller frame 12 is hinged to the middle shell 2 via a hinge shaft 11, and the other end of the roller frame 12 is connected to a buffer spring 5. The buffer spring 5 is a conical helical spring, and a dust cover 50 is provided on the inner side of the buffer spring 5. A loading hydraulic cylinder 6 is located on the side of the buffer spring 5 away from the roller frame 12, and is located on the outer side of the middle shell 2. Specifically, the end of the loading hydraulic cylinder 6 has an extension rod 60, and the end of the roller frame 12 has a baffle 61. A hinge rod 3 is located at the position corresponding to the buffer spring 5 on the roller frame 12. A limiting platform 31 is located on the side of the hinge rod 3 corresponding to the roller frame 12. The buffer spring 5 is located between the baffle 61 and the limiting platform 31, and they are coaxially arranged.
[0016] One end of the hinge rod 3 slides through the axis of the baffle 61. A Hall sensor 7 is provided at the axial end face of the baffle 61. A magnetic ring 32 is provided at the position corresponding to the buffer spring 5 of the hinge rod 3. The magnetic ring 32 is coupled to the Hall sensor 7. The Hall sensor 7 is electrically connected to a controller, which is used to control the working state of the loading hydraulic cylinder 6.
[0017] When using, combine Figures 1 to 3 As shown, the grinding roller 13 on the lower side of the grinding roller assembly 1 achieves the coal grinding process by rolling on the grinding disc 4. The vibration of the grinding roller 13 is buffered by the buffer spring 5. The buffer spring 5 can buffer small-amplitude vibrations during normal operation. When overload vibration occurs, the swing amplitude of the roller frame 12 increases. The hinge rod 3, driven by the roller frame 12, brings the magnetic ring 32 closer to the Hall sensor 7 to collect the overload signal. When the Hall sensor 7 senses the overload signal, the controller controls the retraction of the loading hydraulic cylinder 6, which can effectively reduce the adverse effects caused by overload. After a certain delay, the controller controls the loading hydraulic cylinder 6 to return to the normal working state.
[0018] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.
[0019] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
Claims
1. A device for improving the vibration of a coal mill, comprising a middle shell (2) of the coal mill, wherein a grinding disc (4) is provided at the bottom of the middle shell (2), and a grinding roller assembly (1) is provided at the upper part of the grinding disc (4), characterized in that: The grinding roller assembly (1) includes a roller frame (12), in which a grinding roller (13) is rotatably connected. One end of the roller frame (12) is hinged to the middle housing (2) via a hinge shaft (11). The other end of the roller frame (12) is connected to a buffer spring (5). A loading hydraulic cylinder (6) is provided on the side of the buffer spring (5) away from the roller frame (12). The loading hydraulic cylinder (6) is located on the outside of the middle housing (2).
2. The device for improving the vibration of a coal mill according to claim 1, characterized in that: The end of the loading hydraulic cylinder (6) is provided with an extension rod (60) and a baffle (61). The roller frame (12) is provided with a hinge rod (3) at the position corresponding to the buffer spring (5). The side of the hinge rod (3) corresponding to the roller frame (12) is provided with a limiting platform (31). The buffer spring (5) is located between the baffle (61) and the limiting platform (31).
3. The device for improving the vibration of a coal mill according to claim 2, characterized in that: One end of the hinge rod (3) is slidably inserted through the axis of the baffle (61). A Hall sensor (7) is provided at the axial end face of the baffle (61). A magnetic ring (32) is provided at the position corresponding to the buffer spring (5) of the hinge rod (3). The magnetic ring (32) is coupled to the Hall sensor (7). The Hall sensor (7) is electrically connected to a controller, which is used to control the working state of the loading hydraulic cylinder (6).
4. A device for improving the vibration of a coal mill according to claim 1 or 3, characterized in that: The buffer spring (5) is a conical helical spring, and a dust cover (50) is provided on the inner side of the buffer spring (5).