Medium-speed coal mill movable nozzle ring with replaceable blades

Abstract

The utility model discloses a blade-replaceable movable nozzle ring of a medium-speed coal mill, which relates to the field of pulverizing and crushing equipment and comprises an annular inner wall plate, an annular outer wall plate, a plurality of partition plates, a plurality of clamping sleeves and a plurality of blades. The connecting plate is located in the middle of the annular outer wall plate and the annular inner wall plate. The multiple partition plates are arranged between the annular inner wall plate and the annular outer wall plate and evenly divide the annular inner wall plate and the annular outer wall plate into multiple containing spaces. Each clamping sleeve is arranged in the corresponding containing space and fixed to the inner side face of the annular outer wall plate. And each blade is arranged in the clamping sleeve. According to the utility model, worn blades can be drawn out by loosening the fastening effect on the blades, new wear-resistant blades are inserted between the annular outer wall plate and the annular inner wall plate along the clamping sleeve group and clamped in the clamping grooves, and then the fastening bolts are screwed to fix the blades, so that the purpose of conveniently replacing the moving blades is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverizing and crushing equipment, in particular to a medium-speed coal grinding motor nozzle ring with replaceable blades. Background Art

[0002] The dynamic nozzle ring is the core component of the coal mill, which is related to the output and vibration of the coal mill. At present, due to the limited coal energy, poor coal quality, and high coal wear index ke value, the wear of the coal mill is relatively serious. After the medium-speed coal mill has been running for a period of time, the blades of the nozzle ring will cause varying degrees of wear or defects, which will reduce the output of the coal mill, so it is very necessary to replace the blades of the dynamic nozzle ring in time. In the past, the process of replacing the spare parts of the integral dynamic nozzle ring was very cumbersome. When replacing the nozzle ring, all three internal grinding rollers needed to be removed, which was very time-consuming and labor-intensive. It took about 3 days to replace a set of nozzle rings. Therefore, the complex process of replacing the spare parts of the integral dynamic nozzle ring, the need to disassemble many parts, the large amount of consumables, and the long working hours have always existed.

[0003] Therefore, those skilled in the art provide a medium-speed coal grinding motor nozzle ring with replaceable blades to solve the problems raised in the above-mentioned background technology. Utility Model Content

[0004] The utility model provides a medium-speed coal milling motor nozzle ring with replaceable blades, which overcomes the above-mentioned shortcomings of the existing motor nozzle rings.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model discloses a medium-speed coal grinding motor nozzle ring with replaceable blades, comprising:

[0007] An annular inner wall plate, wherein a flange is embedded in the annular inner wall plate, and the flange is located at the top end of the annular inner wall plate;

[0008] An annular outer wall plate, wherein the annular outer wall plate is connected to the annular inner wall plate via a connecting plate, and the connecting plate is located in the middle of the annular outer wall plate and the annular inner wall plate;

[0009] A plurality of partitions, wherein the plurality of partitions are arranged between the annular inner wall plate and the annular outer wall plate, and evenly divide the annular inner wall plate and the annular outer wall plate into a plurality of accommodating spaces;

[0010] A plurality of ferrules, each of which is disposed in a corresponding accommodating space and fixed on the inner side surface of the annular outer wall plate;

[0011] A plurality of blades, each of which is mounted in a ferrule.

[0012] Furthermore, a slot is provided between the annular outer wall plate and the annular inner wall plate and below the connecting plate.

[0013] Furthermore, a hollow frustum structure is provided on the annular outer wall plate and below the slot.

[0014] Furthermore, each of the blades is fixed to the inner side surface of the annular outer wall plate by fastening bolts.

[0015] Furthermore, the angle between the blade and the annular outer wall plate is 45°.

[0016] Furthermore, the distances between the blades and the annular outer wall plate and the annular inner wall plate are both 3 mm.

[0017] Furthermore, both ends of the blade are arc-shaped structures, and the arc-shaped structures are matched with the arc-shaped parts at corresponding positions on the annular inner wall plate.

[0018] In the above technical scheme, the utility model provides a medium-speed coal mill movable nozzle ring with replaceable blades, which has the following beneficial effects: the present application can open the coal mill maintenance door to unscrew the fastening bolts of the blades at the door, loosen the fastening effect on the blades, and pull out the worn blades, insert new wear-resistant blades along the card sleeve group between the annular outer wall plate and the annular inner wall plate and clamp them in the card groove, and then tighten the fastening bolts to fix the blades. The blades at other positions can be replaced by rotating the turntable to the maintenance door, thereby achieving the purpose of facilitating the replacement of movable blades, avoiding the previous complicated process of replacing the overall movable nozzle ring spare parts, solving the problems of disassembling many parts, large amount of consumables, and long working hours, saving a lot of maintenance time as well as manpower, material and financial resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A cross-sectional view of a medium-speed coal mill motor nozzle ring with replaceable blades provided in an embodiment of the utility model;

[0021] Figure 2 A top view of a medium-speed coal grinding motor nozzle ring with replaceable blades provided in an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1. Flange; 2. Annular outer wall plate; 3. Slot; 4. Annular inner wall plate; 5. Sleeve; 6. Blade; 7. Fastening bolt; 8. Connecting plate; 9. Partition plate. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] See also Figure 1-2 As shown;

[0026] The utility model discloses a medium-speed coal grinding motor nozzle ring with replaceable blades, comprising:

[0027] An annular inner wall plate 4, wherein a flange 1 is embedded in the annular inner wall plate 4, and the flange 1 is located at the top end of the annular inner wall plate 4;

[0028] An annular outer wall plate 2, wherein the annular outer wall plate 2 is connected to the annular inner wall plate 4 via a connecting plate 8, and the connecting plate 8 is located in the middle of the annular outer wall plate 2 and the annular inner wall plate 4;

[0029] A plurality of partitions 9, wherein the plurality of partitions 9 are disposed between the annular inner wall plate 4 and the annular outer wall plate 2, and evenly divide the annular inner wall plate 4 and the annular outer wall plate 2 into a plurality of accommodating spaces;

[0030] A plurality of ferrules 5, each of which is disposed in a corresponding accommodating space and fixed on the inner side of the annular outer wall plate 2;

[0031] A plurality of blades 6 are provided, each of the blades 6 being installed in the ferrule 5 .

[0032] When the coal mill is running, the rotation of the grinding disc drives the nozzle ring of the present application to rotate, and the hot primary air passes through the rotating nozzle ring to form a tangential high-speed rotating airflow along the direction of the blade 6. The high-speed rotating airflow drives the coal powder to finally reach the boiler for combustion.

[0033] A slot 3 is formed between the annular outer wall plate 2 , the annular inner wall plate 4 and the connecting plate 8 .

[0034] The card slot 3 is divided into 36 card slots by a partition plate 9, and the card slot 3 is welded and fixed with the annular outer wall plate 2 and the annular inner wall plate 4 to form a dynamic nozzle ring body, and the card sleeve group is welded on the annular outer wall plate 2 and the annular inner wall plate 4 respectively.

[0035] Furthermore, the annular outer wall plate 2 and below the slot 3 is a hollow frustum structure. The annular outer wall plate 2 is welded by a vertical cylinder and a cone, and finally becomes a trumpet shape, which can increase the ventilation volume of the hot primary air, more easily form a high-speed rotating airflow, and improve the powder carrying efficiency of the coal mill.

[0036] Each blade 6 is fixed to the inner side of the annular outer wall plate 2 by means of a fastening bolt 7 .

[0037] The angle between the blade 6 and the annular outer wall plate 2 is 45°. Furthermore, the distance between the blade 6 and the annular outer wall plate 2 and the annular inner wall plate 4 is 3 mm. This makes the structure more compact and reduces the air leakage rate. For different coal qualities and different working conditions, the coal mill can replace blades with surfacing wear-resistant parts, wear-resistant plates or castings to achieve diversified blade materials.

[0038] Both ends of the blade 6 are arc-shaped structures, and the arc-shaped structures are matched with the arc-shaped parts at corresponding positions on the annular inner wall plate 4.

[0039] After the medium-speed coal mill has been running for a period of time, the blades 6 will cause different degrees of wear or defects. The wear or defects of the blades 6 will cause the ventilation cross-sectional area of ​​the dynamic nozzle ring to become larger, which will reduce the wind speed of the hot primary air in the mill, thereby reducing the powder carrying capacity of the coal mill and reducing the output of the coal mill. Therefore, it is very necessary to replace the blades 6 of the dynamic nozzle ring in time. The present application can open the coal mill maintenance door to unscrew the fastening bolts 7 of the blades 6 at the door, loosen the fastening effect on the blades 6, and then pull out the worn blades 6, insert the new wear-resistant blades 6 along the ferrule 5 group between the annular outer wall plate 2 and the annular inner wall plate 4 and clamp them in the card slot 3, and then tighten the fastening bolts 7 to fix the blades 6. The blades 6 at other positions can be rotated to the maintenance door by turning the wheel for replacement, thereby achieving the purpose of facilitating the replacement of the dynamic blades 6, avoiding the complicated process of replacing the overall dynamic nozzle ring spare parts in the past, solving the problems of many disassembled parts, large amount of consumables, long working hours, etc., saving a lot of maintenance time and manpower, material and financial resources.

[0040] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A medium-speed coal mill motor nozzle ring with replaceable blades, characterized in that: include: An annular inner wall plate (4), wherein a flange (1) is embedded in the annular inner wall plate (4), and the flange (1) is located at the top end of the annular inner wall plate (4); An annular outer wall plate (2), wherein the annular outer wall plate (2) is connected to the annular inner wall plate (4) via a connecting plate (8), and the connecting plate (8) is located in the middle of the annular outer wall plate (2) and the annular inner wall plate (4); A plurality of partitions (9), wherein the plurality of partitions (9) are arranged between the annular inner wall plate (4) and the annular outer wall plate (2), and evenly divide the annular inner wall plate (4) and the annular outer wall plate (2) into a plurality of accommodating spaces; A plurality of ferrules (5), each of the ferrules (5) being arranged in a corresponding accommodating space and fixed on the inner side surface of the annular outer wall plate (2); A plurality of blades (6), each of the blades (6) is installed in the ferrule (5).

2. The medium-speed coal mill motor nozzle ring with replaceable blades according to claim 1, characterized in that: A clamping groove (3) is provided between the annular outer wall plate (2) and the annular inner wall plate (4) and below the connecting plate (8).

3. The medium-speed coal mill motor nozzle ring with replaceable blades according to claim 2, characterized in that: A hollow frustum structure is provided on the annular outer wall plate (2) and below the clamping groove (3).

4. The medium-speed coal mill motor nozzle ring with replaceable blades according to claim 1, characterized in that: Each blade (6) is fixed to the inner side of the annular outer wall plate (2) by means of a fastening bolt (7).

5. The medium-speed coal mill motor nozzle ring with replaceable blades according to claim 1, characterized in that: The angle between the blade (6) and the annular outer wall plate (2) is 45°.

6. The medium-speed coal mill mechanical nozzle ring with replaceable blades according to claim 5, characterized in that: The distances between the blades (6) and the annular outer wall plate (2) and the annular inner wall plate (4) are both 3 mm.

7. The medium-speed coal mill motor nozzle ring with replaceable blades according to claim 1, characterized in that: Both ends of the blade (6) are arc-shaped structures, and the arc-shaped structures are matched with the arc-shaped parts at corresponding positions on the annular inner wall plate (4).

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