Protective fan coal mill

Abstract

The utility model discloses a protection type fan coal mill which comprises a coal mill body, a protection mechanism used for protecting a protection hook and a protection armor is arranged in the coal mill body, the protection mechanism comprises a first fixing seat and a second fixing seat which are fixedly connected with an outlet end, a first baffle is fixedly connected to the first fixing seat, and a second baffle is fixedly connected to the second fixing seat. A second baffle is movably connected to the second fixing base, a sliding groove is formed in the bottom of the second fixing base, a sliding block matched with the second baffle in a sliding mode is arranged at the top of the second baffle, and the first fixing base is fixedly connected with the second baffle through a buffer spring. By arranging the protection mechanism, coal briquettes impact on a second baffle when flying out along with the airflow in the radial direction, the second baffle slides in a sliding groove of a second fixing base through a sliding block, the second baffle does not continue to move rightwards after making contact with the first baffle, and meanwhile when moving rightwards, the second baffle is subjected to the counter-acting force of a buffer spring, and movement of the second baffle is hindered; and the protection mechanism is prevented from being damaged by extreme-speed sliding, so that the protection hook and the armor are protected, and the overhaul frequency and cost are reduced.

Description

Technical Field

[0001] The utility model relates to the field of coal mills, in particular to a protective fan coal mill. Background Art

[0002] A fan mill is a device used in thermal power generation units burning high-moisture lignite. After initial drying by high-temperature flue gas, the raw coal enters the mill casing through a gate. A percussion wheel with a percussion plate crushes it. The crushed coal is further dried and separated in a separator. The qualified coal is then fed into the boiler for combustion. The raw coal enters the impeller axially and is crushed by the high-speed rotating percussion plates. Centrifugal force propels the coal radially outward at high speed, where it impacts the hook and armor, causing further crushing. The coal then flows through the volute passageway into the separator. Because the hook is located at the throat of the volute, where the clearance with the impeller is minimal, the hook and armor experience secondary impact from the abrasive. However, due to the initial acceleration of the abrasive by the percussion plate, the hook and armor experience a relatively high impact velocity, resulting in the most severe wear. This necessitates replacement of the hook and armor before a complete overhaul of the fan mill, increasing both the frequency and cost of overhauls. Therefore, improvements are necessary. Utility Model Content

[0003] In order to solve the above problems, the present invention provides a protective fan coal mill to solve the problems existing in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A protective fan coal mill comprises a coal mill body, the upper end of the coal mill body is provided with an outlet and is connected to a separator, and the lower end of the separator is connected to a coarse powder return pipe; a striking wheel is provided in the coal mill body, a coupling is provided in the middle of the striking wheel, a volute is provided outside the striking wheel, a protective hook is provided on the top of the volute, and one end of the protective hook is connected to armor, and the coal mill body also has a protective mechanism for protecting the protective hook and armor, the protective mechanism comprises a first fixed seat and a second fixed seat fixedly connected to the outlet end, a first baffle is fixedly connected to the first fixed seat, a second baffle is movably connected to the second fixed seat, a slide groove is provided at the bottom of the second fixed seat, a slider is provided on the top of the second baffle to slide with it, and the first fixed seat and the second baffle are fixedly connected by a buffer spring.

[0006] Furthermore, the first baffle is perpendicular to the first fixing seat, and the second baffle is semi-arc-shaped.

[0007] Furthermore, one end of the second fixing seat away from the first fixing seat is in a closed shape.

[0008] Furthermore, the first baffle and the second baffle are made of 16Mn composite plate.

[0009] The beneficial effect of the present invention is that, by setting up a protective mechanism, the coal blocks will hit the second baffle when they fly out radially with the airflow, and the second baffle will slide in the slide groove of the second fixed seat through the slider, and will no longer continue to move to the right after contacting the first baffle. At the same time, when the second baffle moves to the right, it will be subjected to the reaction force of the buffer spring, which will hinder its movement and avoid damage to the protective mechanism caused by extreme sliding, thereby protecting the guard hook and armor and reducing the frequency and cost of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the protective mechanism of the utility model;

[0012] Figure 3 This is a structural diagram of the second fixing seat and the second baffle of the utility model;

[0013] In the figure: 1. Coal mill body; 2. Coupling; 3. Impact wheel; 4. Volute; 5. Protective hook; 6. Armor; 7. Separator; 8. Coarse powder return pipe; 9. Protective mechanism; 901. First fixed seat; 902. First baffle; 903. Second fixed seat; 9031. Slide groove; 904. Second baffle; 9041. Slider; 905. Buffer spring. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0015] A protective fan coal mill, such as Figure 1-3As shown, it includes a coal mill body 1, the upper end of the coal mill body 1 is provided with an outlet and connected to a separator 7, the lower end of the separator 7 is connected to a coarse powder return pipe 8; the coal mill body 1 is provided with a striking wheel 3, the middle of the striking wheel 3 is provided with a coupling 2, the outside of the striking wheel 3 is provided with a volute 4, the top of the volute 4 is provided with a protective hook 5, one end of the protective hook 5 is connected to an armor 6, the coal mill body 1 is also provided with a protective mechanism 9 for protecting the protective hook 5 and the armor 6, the protective mechanism 9 includes a protective mechanism connected to the outlet The first fixing seat 901 and the second fixing seat 903 are fixedly connected at the ends. The first fixing seat 901 is fixedly connected to the first baffle 902, and the second fixing seat 903 is movably connected to the second baffle 904. The bottom of the second fixing seat 903 has a sliding groove 9031, and the top of the second baffle 904 has a slider 9041 that slides with it. The first fixing seat 901 and the second baffle 904 are fixedly connected by a buffer spring 905. The raw coal enters the striking wheel 3 through the coal feeding channel, and the striking wheel The coal blocks rotate at high speed and are crushed by the striking plate on the striking wheel 3. The crushed coal blocks fly out radially at high speed along with the air flow under the action of centrifugal force, and hit the semi-arc-shaped second baffle 904 and are further crushed. The second baffle 904 is movably connected to the second fixed seat 903. When the coal blocks hit the second baffle 904, the slider 9041 drives the second baffle 904 to slide to the right along the slide groove 9031. When the second baffle 904 hits the first baffle 902, since the first baffle 902 is fixedly connected to the first fixed seat, the coal blocks are crushed. At the same time, since the first fixed seat 901 and the second baffle 904 are fixedly connected by the buffer spring 905, when the second baffle 904 is hit and moves to the right, it will be subjected to the reaction force of the buffer spring 905, which hinders its movement, thereby preventing the second baffle 904 from sliding rapidly and causing damage to the protective mechanism 9, thereby protecting the guard hook 5 and the armor 6 and reducing the frequency and cost of maintenance; when not working, the buffer spring 905 rebounds to reset the second baffle 904.

[0016] In the present invention, preferably, the first baffle 902 is perpendicular to the first fixing seat 901, and the second baffle 904 is semi-arc-shaped, which can make the radially flying secondary impacted coal blocks more evenly distributed and improve the crushing efficiency.

[0017] In the present invention, preferably, the end of the second fixing seat 903 away from the first fixing seat 901 is closed, which can prevent the second baffle 904 from derailing.

[0018] In the present invention, preferably, the first baffle 902 and the second baffle 904 are made of 16Mn composite plate, which has good comprehensive mechanical properties, welding properties and low-temperature impact toughness.

[0019] The working principle of the utility model is as follows: the raw coal enters the striking wheel 3 through the coal feeding channel, the striking wheel 3 rotates at high speed and crushes the coal blocks through the striking plate on the striking wheel 3. The crushed coal blocks fly out radially at high speed with the air flow under the action of centrifugal force, hit the semi-arc-shaped second baffle 904 and are further crushed. The second baffle 904 is movably connected to the second fixed seat 903. When the coal blocks hit the second baffle 904, the slider 9041 drives the second baffle 904 to slide to the right along the slide groove 9031. When the second baffle 904 hits the first baffle 902, due to the The first baffle 902 is fixedly connected to the first fixed seat 901, and thus will prevent the second baffle 904 from continuing to move. At the same time, since the first fixed seat 901 and the second baffle 904 are fixedly connected by the buffer spring 905, when the second baffle 904 is hit and moves to the right, it will be subjected to the reaction force of the buffer spring 905, which hinders its movement, thereby preventing the second baffle 904 from sliding rapidly and causing damage to the protective mechanism 9, thereby protecting the guard hook 5 and the armor 6 and reducing the frequency and cost of maintenance; when not working, the buffer spring 905 rebounds to reset the second baffle 904.

[0020] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective fan coal mill, comprising a coal mill body (1), wherein the upper end of the coal mill body (1) is provided with an outlet and connected to a separator (7), and the lower end of the separator (7) is connected to a coarse powder return pipe (8); the coal mill body (1) is provided with a striking wheel (3), a coupling (2) is provided in the middle of the striking wheel (3), a volute (4) is provided outside the striking wheel (3), a protective hook (5) is provided at the top of the volute (4), and one end of the protective hook (5) is connected to an armor (6), characterized in that: The coal mill body (1) also has a protective mechanism (9) for protecting the protective hook (5) and the armor (6), and the protective mechanism (9) includes a first fixed seat (901) and a second fixed seat (903) fixedly connected to the outlet end, a first baffle (902) fixedly connected to the first fixed seat (901), a second baffle (904) movably connected to the second fixed seat (903), a sliding groove (9031) at the bottom of the second fixed seat (903), a sliding block (9041) cooperating with the second baffle (904) at the top of the second baffle (904), and the first fixed seat (901) and the second baffle (904) are fixedly connected via a buffer spring (905).

2. The protective fan coal mill according to claim 1, characterized in that: The first baffle (902) is perpendicular to the first fixing seat (901), and the second baffle (904) is semi-arc-shaped.

3. The protective fan coal mill according to claim 2, characterized in that: One end of the second fixing seat (903) away from the first fixing seat (901) is in a closed shape.

4. The protective fan coal mill according to claim 3, characterized in that: The first baffle (902) and the second baffle (904) are made of 16Mn composite sheet material.

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