Coal mill

Abstract

The invention relates to the technical field of coal mills, in particular to a coal mill which comprises a chute used on the coal mill and a mounting hole formed in the outer wall of the chute in a penetrating mode. The beating assembly is arranged in the mounting hole and comprises a fixed disc arranged in the mounting hole; wherein the fixing disc is provided with a first beating plate and a second beating plate in the same horizontal direction, the distance between the beating center of the first beating plate and the axis of the fixing disc is K1, and the distance between the beating center of the second beating plate and the axis of the fixing disc is K2; according to the chute used on the coal mill, the knocking assembly is arranged, the knocking assembly knocks the outer wall of the chute according to the working state, the phenomenon of adhesion on the inner wall of the chute is avoided as far as possible, the knocking assembly is provided with a plurality of knocking points, the vibration range is expanded as far as possible, and the problem of adhesion of the inner wall of the chute is further solved.

Description

Technical Field

[0001] This invention relates to the field of coal mill technology, and in particular to a coal mill. Background Technology

[0002] Coal mills are indispensable core auxiliary equipment in industries that use coal as energy or raw material, such as coal-fired power generation, metallurgy, and chemical engineering. Their core function is to crush and grind lumpy raw coal into fine coal powder that meets combustion or process requirements, thereby improving coal combustion efficiency and reducing energy consumption. Based on differences in working principles and structures, common types of coal mills include ball mills, medium-speed mills (such as bowl mills and roller mills), and high-speed fan mills. Different types are suitable for different coal types and operating conditions, but all require core processes such as feeding, grinding, separation, and discharging to complete the operation. The chute, as a key component in the coal mill's feeding and material transfer system, acts as a "bridge" for material transport, primarily connecting the raw coal bunker, feeder, and grinding chamber of the coal mill. Some chutes are also used for the return transport of coarse powder after grinding, making them a crucial foundation for ensuring continuous feeding and stable operation of the coal mill.

[0003] Although the structure of a coal mill chute is relatively simple, it must balance wear resistance, flow guidance, and adaptability. Its design and materials must be tailored to the operating characteristics of the coal mill. Structurally, chutes often employ an inclined design, with the inclination angle precisely calculated to ensure the smooth descent of raw coal under gravity while preventing excessively high material flow rates that could cause impact wear. Some large coal mills also incorporate buffer sections or guide plates in their chutes to reduce direct impact from lumpy raw coal on the chute walls. In terms of materials, the inner walls of the chute are typically made of wear-resistant steel plates or composite wear-resistant materials. This is because raw coal often contains hard impurities such as gangue, which continuously erodes and rubs the chute walls during long-term transport. Wear-resistant materials extend the chute's service life. Furthermore, some chutes are equipped with observation ports and maintenance doors to facilitate staff inspection of material transport and timely handling of any abnormalities.

[0004] The chute walls are highly susceptible to coal ash blockage, a phenomenon caused by a combination of factors including material characteristics, chute structure, and changes in operating conditions. From a material perspective, raw coal absorbs moisture from the air during storage and transportation, especially hygroscopic coals like lignite. Increased moisture content causes the coal ash produced during grinding to form highly viscous wet powder. This wet powder is difficult to slide off completely by gravity when flowing through the chute and easily adheres to the chute walls. Simultaneously, the extremely fine coal ash particles have a large surface area and strong intermolecular adsorption, meaning even dry coal ash can easily accumulate on the wall surface due to electrostatic adsorption. From a structural perspective, if the chute's inclination angle is too small, the inner wall is worn and rough, or there are dead angles such as weld seams or corners, the material flow resistance will significantly increase, slowing the flow speed and causing coal ash to gradually accumulate in these areas. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a coal mill, comprising, A chute for use in a coal mill and mounting holes extending through the outer wall of the chute; and... The striking component disposed within the mounting hole includes a fixing disc disposed within the mounting hole; wherein... The fixed plate is provided with a first striking plate and a second striking plate in the same horizontal direction. The distance between the striking center of the first striking plate and the axis of the fixed plate is K1, and the distance between the striking center of the second striking plate and the axis of the fixed plate is K2; wherein, K1 < K2.

[0007] In a preferred embodiment of the coal mill of the present invention, the end of the chute is provided with a feed inlet, and an inspection door is hinged to the outer wall of the chute.

[0008] In a preferred embodiment of the coal mill of the present invention, the outer wall of the chute is provided with a clamping plate for fixing the chute, and the inner wall of the chute is provided with a plurality of lining plates by means of bolts.

[0009] In a preferred embodiment of the coal mill of the present invention, the fixed disk has a transmission groove on its shaft, and a motor is installed in the transmission groove. A connecting shaft is installed at the output end of the motor, and a pressure plate is sleeved on the outer wall of the connecting shaft.

[0010] In a preferred embodiment of the coal mill of the present invention, the first striking plate is connected to the fixed plate via a rotating shaft, and an elastic element is provided between the first striking plate and the fixed plate.

[0011] In a preferred embodiment of the coal mill of the present invention, a first protrusion is integrally formed on one side of the first striking plate, a pressing end is provided on the side of the first striking plate away from the first protrusion, and a movable groove is provided on the end face of the first striking plate to facilitate the movement of the second striking plate.

[0012] In a preferred embodiment of the coal mill of the present invention, the second striking plate is connected to the first striking plate by a hinge, and a spring is provided between the second striking plate and the first striking plate.

[0013] In a preferred embodiment of the coal mill of the present invention, the second striking plate is connected to the first striking plate by a hinge.

[0014] In a preferred embodiment of the coal mill of the present invention, a spring is provided between the second striking plate and the first striking plate.

[0015] In a preferred embodiment of the coal mill of the present invention, the second striking plate is provided with a second protrusion on the side away from the pressure plate.

[0016] The beneficial effects of the present invention are as follows: The chute for a coal mill provided by the present invention is equipped with a striking component. The striking component will strike the outer wall of the chute in the working state to avoid the adhesion phenomenon on the inner wall of the chute as much as possible. Furthermore, the striking component has multiple striking points to maximize the vibration range and further optimize the adhesion problem on the inner wall of the chute. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the striking component structure in this invention.

[0019] Figure 3 This is a schematic diagram of the striking distance in this invention.

[0020] Figure 4 This is a bottom view schematic diagram of the chute structure in this invention.

[0021] Figure 5 This is an enlarged schematic diagram of the second striking plate structure and a portion thereof in this invention. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] The chute 10, used for feeding and transferring materials in a coal mill, has a through-hole 101 on its outer wall. The edges of the hole are chamfered to prevent scratching the striking component 20 during assembly. A sealing gasket is fitted at the mating surface between the mounting hole 101 and the striking component 20 to prevent coal ash dust generated during coal mill operation from leaking through the assembly gap. The striking component 20, located within the mounting hole 101, has a core component called a fixing plate 21 that fits tightly against the inner wall of the mounting hole 101. This fixing plate 21 provides a stable assembly base for various striking components, ensuring stable transmission of striking action. The fixing plate 21 is equipped with a first striking plate 23 and a second striking plate 24 on the same horizontal direction. The two striking plates work together to thoroughly knock and clear blockages from the chute wall 10. The distance between the striking center of the first striking plate 23 and the axis of the fixed plate 21 is K1, and the distance between the striking center of the second striking plate 24 and the axis of the fixed plate 21 is K2, and K1 < K2. This design allows the two striking plates to cover areas of different radii on the inner wall of the chute 10, avoiding dead corners for clearing blockages. A feed inlet 102 is provided at the end of the chute 10. The edge of the feed inlet 102 is equipped with an anti-scratching edge structure to prevent the raw coal from being scratched by sharp edges. An inspection door 11 is hinged to the outer wall of the chute 10 via a hinge structure. The inner side of the inspection door 11 is equipped with a sealing strip, which can achieve a tight seal with the outer wall of the chute 10 when closed, preventing dust leakage and facilitating quick access for personnel to troubleshoot and clean the interior of the chute 10. A clamping plate 111 is integrally formed on the outer wall of the chute 10 for fixing the chute 10. The surface of the clamping plate 111 has a matching installation position, which can be precisely connected with the corresponding assembly structure of the coal mill body, improving the overall stability of the chute 10 after installation and resisting the vibration of the coal mill during operation. The inner wall of the chute 10 is detachably installed with several liners 12 by bolts. The liners are made of wear-resistant and impact-resistant material and the surface of the liners is treated with anti-slip treatment. This can reduce the direct wear of raw coal and coal ash on the inner wall of the chute 10, reduce the probability of material adhesion, and extend the service life of the chute 10. When the liners 12 are severely worn, they can be disassembled and replaced individually to reduce maintenance costs. A transmission groove 211 for assembling power components is provided at the center of the fixed disk 21. A positioning protrusion is provided on the inner wall of the transmission groove 211. A motor is fixedly installed inside the transmission groove 211, and the motor is limited and fixed to the inner wall of the transmission groove 211 by the positioning protrusion to prevent displacement during operation. A connecting shaft 22 is fixedly installed at the output end of the motor. A pressure plate 221 is sleeved on the outer wall of the connecting shaft 22. The pressure plate 221 is connected to the connecting shaft 22 by a tight fit. Its function is to provide axial limitation for the fixed disk 21 and surrounding assembled components, preventing axial movement of components during transmission and ensuring transmission stability. The first striking plate 23 is rotatably connected to the fixed plate 21 via a pivot, and an elastic element 212 is provided between the first striking plate 23 and the fixed plate 21. The elastic element 212 is always in a pre-tightened state and can be quickly driven to reset after the first striking plate 23 completes the striking action, ensuring a continuous and stable striking effect. A first protrusion 232 is integrally formed on one side of the first striking plate 23. The first protrusion 232 is used to enhance the structural strength of this side and prevent the plate from deforming during the striking process. A pressing end 233 is provided on the side of the first striking plate 23 away from the first protrusion 232. The surface of the pressing end 233 is smoothed to facilitate smooth transmission when in contact with other components. An active groove 231 is opened on the end face of the first striking plate 23 to facilitate the movement of the second striking plate 24. The groove wall of the active groove 231 is rounded to prevent the second striking plate 24 from getting stuck when it moves. The second striking plate 24 is rotatably connected to the first striking plate 23 via a hinge 25, and a spring piece 234 is provided between them. The spring piece 234 has good elastic deformation capability, which can assist the second striking plate 24 in resetting and at the same time buffer the impact force between the two plates. The second striking plate 24 has a second protrusion 241 on the side away from the pressure plate 221. When the second protrusion 241 contacts the inner wall of the chute 10, it forms a concentrated striking force, which improves the cleaning effect of coal ash adhering to the chute wall, and the protrusion structure can reduce the wear of the striking plate body.

[0026] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A coal mill, characterized in that: include, A chute (10) for use on a coal mill and a mounting hole (101) penetrating the outer wall of the chute (10); and, The striking component (20) disposed within the mounting hole (101) includes a fixing plate (21) disposed within the mounting hole (101); wherein, The fixed disk (21) is provided with a first striking plate (23) and a second striking plate (24) in the same horizontal direction. The distance between the striking center of the first striking plate (23) and the axis of the fixed disk (21) is K1, and the distance between the striking center of the second striking plate (24) and the axis of the fixed disk (21) is K2; wherein, K1 < K2.

2. The coal mill as described in claim 1, characterized in that: The end of the chute (10) is provided with a feed inlet (102), and an inspection door (11) is hinged to the outer wall of the chute (10).

3. The coal mill as described in claim 2, characterized in that: The outer wall of the chute (10) is provided with a clamping plate (111) for fixing the chute (10), and the inner wall of the chute (10) is provided with several liner plates (12) by bolts.

4. The coal mill as described in claim 3, characterized in that: The fixed disk (21) has a transmission groove (211) on its shaft, and a motor is installed in the transmission groove (211). A connecting shaft (22) is installed at the output end of the motor, and a pressure plate (221) is sleeved on the outer wall of the connecting shaft (22).

5. The coal mill as described in claim 4, characterized in that: The first striking plate (23) is connected to the fixed plate (21) via a rotating shaft, and an elastic element (212) is provided between the first striking plate (23) and the fixed plate (21).

6. The coal mill as described in claim 5, characterized in that: The first striking plate (23) has a first protrusion (232) integrally formed on one side. The first striking plate (23) has a pressing end (233) on the side away from the first protrusion (232). The end face of the first striking plate (23) has an active groove (231) to facilitate the movement of the second striking plate (24).

7. The coal mill as described in claim 6, characterized in that: The second striking plate (24) is connected to the first striking plate (23) by a hinge (25), and a spring piece (234) is provided between the second striking plate (24) and the first striking plate (23).

8. The coal mill as described in claim 7, characterized in that: The second striking plate (24) is connected to the first striking plate (23) by a hinge (25).

9. The coal mill as described in claim 8, characterized in that: A spring piece (234) is provided between the second striking plate (24) and the first striking plate (23).

10. The coal mill as described in claim 9, characterized in that: The second striking plate (24) has a second protrusion (241) on the side away from the pressure plate (221).

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