A stirring mechanism for a classification mill

Abstract

The utility model relates to a kind of stirring mechanism for grading grinder, including grinding cylinder and the support for supporting grinding cylinder, grinding cylinder is divided into three levels of grinding bin, the top end of grinding cylinder is equipped with feeding hopper and is used to drive the speed reducer of material grinding, each level of grinding bin front end is equipped with door body, each level of grinding bin can be detachably installed with grinding stirring assembly, each level of grinding bin lower part is equipped with fixed column, fixed column outer side and grinding cylinder inner wall between fixed with reinforcing rib, adjacent two between the reinforcing rib fixed with screen, the middle part of fixed column and the inner top surface of grinding cylinder rotatably install the clamping assembly for fixed grinding stirring assembly.The utility model is detachable segmented design to grinding stirring assembly, cooperate quick-release door body, so as to facilitate the maintenance and replacement of mechanism, and can separately complete the disassembly of single-stage grinding stirring assembly, to reduce the maintenance cost of component.

Description

Technical Field

[0001] This utility model relates to the technical field of coal pretreatment equipment for thermal power generation, and in particular to a stirring mechanism for a grading grinder. Background Technology

[0002] In the thermal power generation process, coal grinding and pretreatment is a core step that determines subsequent combustion efficiency, power generation efficiency, and pollutant emission levels. Modern large-scale thermal power plants generally adopt pulverized coal combustion technology, which requires multi-stage grinding of raw coal to a fine coal powder of 0.05-0.1mm (80% of the coal powder can pass through an 80-mesh sieve). This increases the specific surface area of ​​the coal to achieve complete combustion, reducing energy waste and harmful gas emissions. In this process, the coal grading mill, as the core equipment, plays a crucial role in material stirring, mixing, conveying, and auxiliary grinding, directly affecting grinding efficiency, product particle size uniformity, and equipment operational stability.

[0003] However, in practical applications, the mixing mechanism of existing coal grading and grinding mills still suffers from many technical challenges due to the complexity of raw coal composition and operating conditions. In particular, its deficiencies in wear resistance have become a major bottleneck restricting the efficient operation of coal pretreatment in thermal power generation. The specific problems are as follows:

[0004] Raw coal commonly contains impurities with high hardness, such as gangue, pyrite, and metal fragments (gangue has a Mohs hardness of 6-7, much higher than coal's 2-3). During the operation of the mixing mechanism, the core components, such as the mixing blades, grinding media (e.g., steel balls, grinding rollers), and mixing discs, are subject to continuous impact, compression, and friction with the coal and impurities. This leads to severe wear on the core components of the mixing mechanism, requiring regular maintenance and replacement. Existing mixing and crushing components are mostly integrated structures, and the entire grinding and mixing component needs to be replaced after a single stage is damaged, which greatly increases the production cost of the equipment. Therefore, it is necessary to research a mixing mechanism for a classifying grinding mill. Utility Model Content

[0005] The purpose of this invention is to address the problem that in the existing technology, most mixing and grinding components are integrated structures, and the entire grinding and mixing component needs to be replaced when a single stage is damaged, which greatly increases the production cost of the equipment. Therefore, this invention proposes a mixing mechanism for a classifying grinding machine.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A stirring mechanism for a grading grinder includes a grinding cylinder and a support for supporting the grinding cylinder. The grinding cylinder is divided into three grinding chambers. A feeding hopper and a reducer for driving the grinding of materials are installed at the top of the grinding cylinder. A door is installed at the front end of each grinding chamber. A grinding and stirring assembly can be detachably installed inside each grinding chamber. A fixed column is provided at the bottom of each grinding chamber. A reinforcing rib is fixed between the outer side of the fixed column and the inner wall of the grinding cylinder. A screen is fixed between two adjacent reinforcing ribs. A snap-fit ​​assembly for fixing the grinding and stirring assembly is rotatably installed in the middle of the fixed column and on the top surface of the grinding cylinder.

[0008] Furthermore, the grinding and stirring assembly includes a grinding rod, a grinding blade is fixed to the outer wall of the grinding rod, a locking groove is provided at the top of the grinding rod, and fixing holes are provided through the lower ends of the grinding rod on both sides.

[0009] Furthermore, a protective sleeve is also fitted onto the outer wall of the lower end of the grinding rod.

[0010] Furthermore, the snap-fit ​​assembly includes mounting posts, which are provided in multiple locations and rotatably mounted on the middle of the fixed post and the top surface inside the grinding cylinder. The surface of the mounting post at the lower end of each grinding chamber has a circular hole for locking the grinding rod. One side of the circular hole has a slot for easy loading and unloading of the grinding rod. A limiting arc-shaped piece is rotatably mounted on one side of the slot. The grinding rod is fixed to the limiting arc-shaped piece and the mounting post by bolts. The surface of the mounting post at the upper end of each grinding chamber has an installation groove. A snap-fit ​​post is fixed on the top surface of the installation groove. An insert that matches the groove is fixed on the outer wall of the snap-fit ​​post. A contact spring is also sleeved on the outer wall of the snap-fit ​​post near the installation groove.

[0011] Furthermore, the bolt is embedded inside the slot, the limiting arc-shaped piece matches the shape of the slot, and the distance between the front and rear ends of the slot is greater than the diameter of the grinding rod.

[0012] Furthermore, each of the inserts is provided in multiples and evenly distributed on the outside of the locking post, and each insert and slot has at least six axial constraint points for engagement.

[0013] Furthermore, the reinforcing ribs are provided in multiple and evenly distributed on the outside of the fixed column. The upper ends of the reinforcing ribs are all inclined downward from the middle to both sides. The screen is set at the lower end of the reinforcing ribs, and one side of the screen is fixed to the inner wall of the grinding cylinder.

[0014] Furthermore, the mesh size of the screen at the lower end of the third-stage grinding chamber decreases sequentially from top to bottom, and the output end of the reducer is fixedly connected to the column mounted on the top surface inside the grinding cylinder.

[0015] This utility model has the following beneficial effects:

[0016] 1. The grinding and stirring assembly in this utility model adopts a detachable segmented design, combined with a quick-release door, which facilitates the maintenance and replacement of the mechanism, and can independently complete the disassembly and assembly of a single-stage grinding and stirring assembly, thereby reducing the maintenance cost of the assembly.

[0017] 2. The snap-fit ​​assembly in this utility model adopts a multi-constraint point design, combined with a contact spring, to ensure the stability of the grinding and stirring assembly when rotating at high speed, reduce wear caused by vibration, and greatly extend the service life of the assembly. Attached Figure Description

[0018] Figure 1 This is a front structural diagram of the utility model;

[0019] Figure 2 This is a side sectional view of the utility model;

[0020] Figure 3 This is a planar structural diagram of the grinding and stirring assembly used in this application.

[0021] Figure 4 This is a diagram showing the connection between the insert and the locking post in this utility model;

[0022] Figure 5 This is a plan view of the groove used in this utility model;

[0023] Figure 6 For practical purposes Figure 2 Sectional view at point BB;

[0024] Figure 7 For practical purposes Figure 2 Enlarged view of point A in the middle.

[0025] Legend: 1. Grinding cylinder; 2. Feeding hopper; 3. Reducer; 4. Door; 5. Grinding and mixing assembly; 6. Fixing column; 7. Reinforcing rib; 8. Screen; 9. Mounting column; 10. Limiting arc plate; 11. Bolt; 12. Locking post; 13. Insert; 14. Contact spring; 15. Support; 51. Grinding rod; 52. Grinding blade; 53. Groove; 54. Fixing hole; 55. Protective sleeve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example:

[0028] Reference Figure 1 - Figure 7 A stirring mechanism for a grading grinder includes a grinding cylinder 1 and a support 15 for supporting the grinding cylinder 1. The grinding cylinder 1 is divided into three grinding chambers. The inner wall of each grinding chamber is made of wear-resistant cast iron and has been quenched to a surface hardness of HRC50-55, effectively improving the wear resistance of the grinding cylinder 1. A feeding hopper 2 and a reducer 3 for driving the grinding of the material are installed at the top of the grinding cylinder 1. The feeding hopper 2 is located at the edge of the grinding cylinder 1 for easy feeding. The reducer 3 is located at the center of the outer top surface of the grinding cylinder 1. A grinding and stirring assembly 5 can be detachably installed in each grinding chamber. A door 4 is installed at the front end of each grinding chamber to facilitate the disassembly, assembly, and maintenance of the grinding and stirring assembly 5. A fixing column 6 is provided at the bottom of each grinding chamber. A reinforcing rib 7 is fixed between the outer side of the fixed column 6 and the inner wall of the grinding cylinder 1. Multiple reinforcing ribs 7 are provided and evenly distributed on the outer side of the fixed column 6. A screen 8 is fixed between two adjacent reinforcing ribs 7. The upper ends of the reinforcing ribs 7 are all inclined downward from the middle to both sides, which can prevent coal from accumulating at the reinforcing ribs 7 to a certain extent. The screen 8 is located at the lower end of the reinforcing ribs 7, and one side of the screen 8 is fixed to the inner wall of the grinding cylinder 1. The inner layer of the screen 8 is a metal mesh and the outer layer is a polyurethane mesh, which not only ensures the screening effect but also improves the wear resistance, thereby realizing the screening operation of coal. A snap-fit ​​component for fixing the grinding and stirring assembly 5 is rotatably installed in the middle of the fixed column 6 and the top surface of the grinding cylinder 1, thereby ensuring the stability of the three grinding and stirring assemblies 5 during operation.

[0029] The grinding and stirring assembly 5 includes a grinding rod 51, a grinding blade 52 fixed on the outer wall of the grinding rod 51, a locking groove 53 at the top of the grinding rod 51, and fixing holes 54 through the lower ends of the grinding rod 51.

[0030] The lower end of the grinding rod 51 is also fitted with a protective sleeve 55, which can prevent the coal from directly contacting the fixed part during operation, thereby extending the service life of the component.

[0031] The snap-fit ​​assembly includes mounting posts 9, which are provided in multiples and rotatably mounted on the middle of the fixed posts 6 and the top surface inside the grinding cylinder 1. The surface of the mounting posts 9 at the lower end of each grinding chamber is provided with a round hole for locking the grinding rod 51. A slot is provided on one side of the round hole to facilitate the removal and placement of the grinding rod 51. A limiting arc plate 10 is rotatably mounted on one side of the slot. The grinding rod 51 is fixed to the limiting arc plate 10 and the mounting posts 9 by bolts 11. The bolts 11 pass through the fixing holes 54. The surface of the mounting posts 9 at the upper end of each grinding chamber is provided with a mounting groove. A snap-fit ​​post 12 is fixed on the top surface of the mounting groove. An insert 13 that matches the groove 53 is fixed on the outer wall of the snap-fit ​​post 12. A contact spring 14 is also sleeved on the outer wall of the snap-fit ​​post 12 near the mounting groove, thereby ensuring that the insert 13 and the groove 53 fit tightly.

[0032] Bolt 11 is embedded inside the groove, and the limiting arc-shaped piece 10 matches the shape of the groove. The distance between the front and rear ends of the groove is greater than the diameter of the grinding rod 51, which facilitates the placement and removal of the grinding and stirring assembly 5.

[0033] Each insert 13 is provided in multiples and evenly distributed on the outside of the locking post 12. Each insert 13 and the slot 53 has at least six axial constraint points for engagement. The multi-constraint point design can effectively improve the connection stability between the grinding rod 51 and the mounting post 9 and prevent shaking during high-speed rotation.

[0034] The screen mesh 8 at the lower end of the three-stage grinding chamber has a progressively smaller aperture from top to bottom. The screen mesh aperture of the first-stage grinding chamber is 8-10mm, the second-stage is 3-5mm, and the third-stage is 0.1-0.3mm, realizing the progressive fine grinding of coal. The output end of the reducer 3 is connected to the column 9 mounted on the top surface of the grinding cylinder 1 through a coupling to realize power transmission. The coupling adopts an elastic structure, which can effectively buffer impact loads.

[0035] When the component needs maintenance or repair after a period of use, first open the corresponding level door 4, then push up the protective cover 55, remove the bolt 11 with a wrench, then push the grinding rod 51 upward and pull it out, thereby taking out the grinding and stirring component 5. After taking it out, maintain or replace the grinding and stirring component 5. This realizes the quick disassembly and assembly of the stirring mechanism, which greatly increases the flexibility of the stirring mechanism.

[0036] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stirring mechanism for a grading grinder, comprising a grinding cylinder (1) and a support (15) for supporting the grinding cylinder (1), the grinding cylinder (1) being divided into three grinding chambers, wherein a feeding hopper (2) and a reducer (3) for driving the grinding of materials are installed at the top of the grinding cylinder (1), characterized in that, Each grinding chamber is equipped with a door (4) at the front end, and a grinding and stirring assembly (5) can be detached and installed inside each grinding chamber; Each grinding chamber has a fixed column (6) at the bottom. A reinforcing rib (7) is fixed between the outer side of the fixed column (6) and the inner wall of the grinding cylinder (1). A screen (8) is fixed between two adjacent reinforcing ribs (7). A snap-fit ​​assembly for fixing the grinding and stirring assembly (5) is rotatably installed in the middle of the fixed column (6) and on the top surface of the grinding cylinder (1).

2. The stirring mechanism for a classifying grinder according to claim 1, characterized in that: The grinding and stirring assembly (5) includes a grinding rod (51), a grinding blade (52) is fixed on the outer wall of the grinding rod (51), a locking groove (53) is provided at the top of the grinding rod (51), and fixing holes (54) are provided on both sides of the lower end of the grinding rod (51).

3. The stirring mechanism for a classifying grinder according to claim 2, characterized in that: The lower end of the grinding rod (51) is also fitted with a protective sleeve (55).

4. The stirring mechanism for a classifying grinder according to claim 3, characterized in that: The snap-fit ​​assembly includes mounting posts (9), which are provided in multiple ways and rotatably mounted on the middle of the fixed post (6) and the top surface of the grinding cylinder (1). The surface of the mounting post (9) at the lower end of each grinding chamber is provided with a round hole for locking the grinding rod (51). A slot is provided on one side of the round hole to facilitate the removal and placement of the grinding rod (51). A limiting arc plate (10) is rotatably mounted on one side of the slot. The grinding rod (51) is fixed to the limiting arc plate (10) and the mounting post (9) by bolts (11). The surface of the mounting post (9) at the upper end of each grinding chamber is provided with a mounting groove. A snap-fit ​​post (12) is fixed on the top surface of the mounting groove. An insert (13) that matches the groove (53) is fixed on the outer wall of the snap-fit ​​post (12). A contact spring (14) is also sleeved on the outer wall of the snap-fit ​​post (12) near the mounting groove.

5. The stirring mechanism for a classifying grinder according to claim 4, characterized in that: The bolt (11) is embedded in the inside of the slot, and the limiting arc-shaped piece (10) matches the shape of the slot. The distance between the front and rear ends of the slot is greater than the diameter of the grinding rod (51).

6. The stirring mechanism for a classifying grinder according to claim 4, characterized in that: Each of the inserts (13) is provided in multiples and evenly distributed on the outside of the locking post (12), and each insert (13) and the slot (53) has at least six engagement axial constraint points.

7. The stirring mechanism for a classifying grinder according to claim 1, characterized in that: The reinforcing ribs (7) are provided in multiple and evenly distributed on the outside of the fixed column (6). The upper ends of the reinforcing ribs (7) are all inclined downward from the middle to both sides. The screen (8) is set at the lower end of the reinforcing ribs (7), and one side of the screen (8) is fixed on the inner wall of the grinding cylinder (1).

8. A stirring mechanism for a classifying grinder according to claim 4, characterized in that: The mesh size of the screen (8) at the lower end of the grinding chamber of the third stage decreases from top to bottom, and the output end of the reducer (3) is fixedly connected to the column (9) installed on the inner top surface of the grinding cylinder (1).

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