Dynamic and static type base sealing device of coal mill

Abstract

The utility model provides a coal mill dynamic and static type base sealing device, which relates to the field of coal mills, and comprises a shell, a milling bowl, a dynamic ring and a static ring, a filter assembly is arranged on the milling bowl, and a cleaning assembly is fixed on the inner wall of the shell; and the filtering assembly comprises a filtering ring fixed to the top of the grinding bowl, round rods are fixed to the outer surface wall of the filtering ring in a circumferential array mode, one end of each round rod is rotationally connected with a rolling wheel through a bearing, and an annular rail is fixed to the top of the static ring. By arranging the filtering assembly, when a ground coal and pulverized coal block mixture moves to the air outlet of the movable ring and the position above the gap between the movable ring and the static ring, as the air outlet of the movable ring can blow air upwards to separate pulverized coal, coal block particles with large mass can be blocked and intercepted on the filtering assembly; therefore, the coal briquette particles are prevented from falling onto the lower dynamic and static bases to influence the stability of a base sealing system, and the fault rate of the coal mill is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coal mill, especially to a coal mill dynamic and static base sealing device. BACKGROUND

[0002] The coal mill is an important equipment in the power plant, which directly affects the stability and economy of the unit operation, so the normal operation of the coal mill is very important, and the normal operation of the coal mill is also related to the sealing performance of the dynamic and static base, the sealing air chamber forms a false closed space by forming a false closed space, and the sealing air is introduced into the sealing air chamber to form a positive pressure area to prevent the stone coal generated during the operation of the coal mill from entering the sealing air chamber and causing the carbon ring to be damaged.

[0003] The utility model discloses a coal mill dynamic and static base sealing device, which comprises a flat iron, a metal slag blocking ring, a sealing element, an external static sealing element and a dynamic sealing element, the sealing element, a flange element A and a spring A constitute an inner sealing assembly, the flange element A is fixed on the coal mill transmission disc through bolts, and the spring A is connected with the coal mill transmission disc.

[0004] However, at present, the hot air for drying and conveying the coal powder needs to be blown from the dynamic and static ring, and some ungrounded coal particles will leak from the gap of the dynamic and static ring, even if the coal particles are scraped away by the scraper, some coal particles will still fall to the dynamic and static base, and in serious cases, sparks will be generated, which directly threatens the safety of the hydraulic oil system and the lubricating oil system of the coal mill, and causes the coal mill to be unable to operate normally. UTILITY MODEL CONTENTS

[0005] The utility model discloses a coal mill dynamic and static base sealing device, which comprises a flat iron, a metal slag blocking ring, a sealing element, an external static sealing element and a dynamic sealing element, the sealing element, a flange element A and a spring A constitute an inner sealing assembly, the flange element A is fixed on the coal mill transmission disc through bolts, and the spring A is connected with the coal mill transmission disc.

[0006] In order to achieve the above-mentioned purpose, the utility model discloses a coal mill dynamic and static base sealing device, which comprises an outer shell, a grinding bowl, a dynamic ring and a static ring, the grinding bowl is provided with a filtering assembly, and the inner wall of the outer shell is fixed with a cleaning assembly.

[0007] Preferably, the cleaning assembly comprises a brush, the top of the brush is fixed with a connecting rod, one end of the connecting rod is fixed with a square flange, and the square flange is fixed on the outer shell through bolts.

[0008] Preferably, the brush is arc-shaped, the bottom of the brush is in close contact with the top of the filtering ring, and the brush is inclined and slides on the filtering ring.

[0009] Preferably, the filter ring is downwardly inclined to the grinding bowl direction.

[0010] Preferably, the top of the end of the moving ring close to the static ring is provided with an inclined platform, the end of the static ring close to the moving ring is provided with an inclined plate, and the inclined plate is matched with the inclined platform.

[0011] Compared with the prior art, the advantages and positive effects of the utility model lie in that,

[0012] In the utility model, when the mixture of coal powder and coal blocks after grinding moves to the air outlet of the moving ring and above the gap between the moving ring and the static ring, the moving ring air outlet blows upward to separate the coal powder, the coal block particles with large mass are blocked and retained on the filter assembly, thereby avoiding the coal block particles falling downward to the lower dynamic and static base to affect the stability of the base sealing system, further reducing the failure rate of the coal mill, and the filter ring rotates under the rotation of the grinding bowl, cooperates with the cleaning assembly to clean the coal block particles retained on the filter ring and guide the flow to the grinding bowl direction, so that the ungrounded coal blocks can be re-grounded. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an overall structure perspective view of the dynamic and static base sealing device of the coal mill.

[0014] Figure 2 It is a filter ring and grinding bowl separation structure perspective view of the dynamic and static base sealing device of the coal mill.

[0015] Figure 3 It is an enlarged structure perspective view of position A of the dynamic and static base sealing device of the coal mill.

[0016] Figure 4 It is a cut structure plan view of the shell, grinding bowl, filter ring and annular track of the dynamic and static base sealing device of the coal mill.

[0017] Figure 5 It is an enlarged structure view of position B of the dynamic and static base sealing device of the coal mill.

[0018] Legend: 1, shell; 2, grinding bowl; 3, moving ring; 301, inclined platform; 4, static ring; 401, inclined plate; 5, filter assembly; 501, filter ring; 502, round rod; 503, roller; 504, annular track; 6, cleaning assembly; 601, brush; 602, connecting rod; 603, square flange. DETAILED DESCRIPTION

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1: As Figures 1-5 As shown, this utility model provides a coal mill motor-static base sealing device, including a shell 1, a grinding bowl 2, a moving ring 3 and a stationary ring 4. A filter assembly 5 is provided on the grinding bowl 2, and a cleaning assembly 6 is fixed on the inner wall of the shell 1. The filter assembly 5 includes a filter ring 501 fixed on the top of the grinding bowl 2. Round rods 502 are fixed in a circular arrangement on the outer wall of the filter ring 501. One end of each round rod 502 is rotatably connected to a roller 503 through a bearing. An annular track 504 is fixed on the top of the stationary ring 4, and the round rods 502 and rollers 503 slide within the annular track 504.

[0022] The effect achieved by the entire embodiment 1 is that the filter ring 501 fixed on the grinding bowl 2 will rotate with the rotation of the grinding bowl 2. The setting of the roller 503 and the annular track 504 can make the filter ring 501 rotate very smoothly above the moving ring 3 and the stationary ring 4. The filter assembly 5 can intercept the coal pieces that cannot be sorted out, so the coal pieces will not fall. The cleaning assembly 6 can clean the intercepted coal pieces and make the coal pieces re-enter the grinding bowl 2 for grinding, thereby improving the grinding effect of the coal pieces.

[0023] Example 2: Figures 1-5 As shown, the cleaning assembly 6 includes a brush 601, a connecting rod 602 fixed to the top of the brush 601, and a square flange 603 fixed to one end of the connecting rod 602. The square flange 603 is fixed to the outer casing 1 by bolts. The brush 601 is arc-shaped, and the bottom of the brush 601 is in close contact with the top of the filter ring 501. The brush 601 slides on the filter ring 501 at an angle. The filter ring 501 is inclined downwards towards the grinding bowl 2. The top of the moving ring 3 near the stationary ring 4 is provided with an inclined platform 301, and the end of the stationary ring 4 near the moving ring 3 is provided with an inclined plate 401. The inclined plate 401 is adapted to the inclined platform 301.

[0024] The overall effect of embodiment 2 is that multiple brushes 601 installed on the outer casing 1 can clean the coal lumps on the filter ring 501. The brushes 601 tilted on the filter ring 501 can guide the coal lumps, so that the coal lumps can return to the grinding bowl 2 in the middle for grinding under the cooperation of the brushes 601 and the rotating filter ring 501. This can clean the filter ring 501, prevent the coal lumps from clogging the filter ring 501, and thus maintain the sorting effect of the air blown out by the moving ring 3 on the coal powder.

[0025] Working principle: When the coal mill grinds coal lumps, the grinding bowl 2 and the moving ring 3 rotate together. The rotation of the grinding bowl 2 drives the filter ring 501 to rotate as well. As the filter ring 501 rotates, the rollers 503 mounted on its outer surface slide within the annular track 504. Hot air is blown upwards from the moving ring 3 to separate and dry the coal powder. When the coal lumps are ground by the grinding rollers in the grinding bowl 2, the finely ground coal lumps and coal powder are gradually dispersed to the surrounding area. When the coal lumps and coal powder mixture reaches the filter ring 501 above the moving ring 3, the upward-blown air from the moving ring 3 removes the coal powder from the mixture. The powder is blown upwards, separating the coal powder and coal lumps mixture, and the mixture is conveyed towards the brush 601. The coal lumps still stuck on the filter ring 501 are swept up by the arc-shaped brush 601 brushing the surface of the filter ring 501. The tilt angle of the brush 601 matches the rotation direction of the filter ring 501, which guides the swept coal lumps, allowing them to move towards the central grinding bowl 2 so that they can return to the grinding bowl 2 for grinding. In summary, this solves the problem mentioned in the background.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A coal mill motor-static base sealing device, characterized in that: It includes a shell (1), a grinding bowl (2), a moving ring (3) and a stationary ring (4). A filter assembly (5) is provided on the grinding bowl (2), and a cleaning assembly (6) is fixed on the inner wall of the shell (1). The filter assembly (5) includes a filter ring (501) fixed to the top of the grinding bowl (2). The outer wall of the filter ring (501) is fixed with a circular rod (502) arranged in a circle. One end of each circular rod (502) is rotatably connected to a roller (503) through a bearing. The top of the stationary ring (4) is fixed with an annular track (504). The circular rod (502) and the roller (503) slide within the annular track (504).

2. The coal mill motorized static base sealing device according to claim 1, characterized in that: The cleaning assembly (6) includes a brush (601), a connecting rod (602) is fixed to the top of the brush (601), and a square flange (603) is fixed to one end of the connecting rod (602). The square flange (603) is fixed to the outer casing (1) by bolts.

3. The coal mill motorized static base sealing device according to claim 2, characterized in that: The brush (601) is arc-shaped, and the bottom of the brush (601) is in close contact with the top of the filter ring (501), and the brush (601) slides on the filter ring (501) at an angle.

4. The coal mill motorized and static base sealing device according to claim 1, characterized in that: The filter ring (501) is inclined downwards towards the grinding bowl (2).

5. The coal mill motorized and static base sealing device according to claim 1, characterized in that: The top of the moving ring (3) near the stationary ring (4) is provided with an inclined platform (301), and the bottom of the stationary ring (4) near the moving ring (3) is provided with an inclined plate (401), which is adapted to the inclined platform (301).

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