CN115739364A - Layered sectional type dynamic and static ring of coal mill - Google Patents

Abstract

The invention discloses a layered and sectional type moving and static ring of a coal mill, which comprises a static ring and a moving ring arranged on the inner side of the static ring, wherein the bottom of the static ring is connected with an integrally formed static ring base; the rotating ring includes a plurality of section structure the same rotating ring section, and the rotating ring is close to quiet ring one side rigid coupling and has a plurality of rotating ring separation tooth, and a plurality of rotating ring separation tooth evenly sets up along rotating ring circumference. The layered and sectional type moving and static ring of the coal mill can remove the damaged moving ring or static ring in a targeted manner, does not need to be removed integrally, saves time and labor and greatly reduces the maintenance cost of equipment.

Description

Layered and segmented dynamic and static rings for coal pulverizers

technical field

The invention belongs to the technical field of coal mill equipment, and in particular relates to a layered and segmented dynamic and static ring of a coal mill.

Background technique

After the coal mill has been running for a period of time, the dynamic and static rings will be severely worn due to wind erosion, stone coal, iron and other impurities, especially in the nozzle throat of the dynamic ring and the upper part of the static ring, and even some Occasionally, the static ring will be worn through and cause the primary wind of the coal mill to leak, resulting in an increase in the amount of coal in the coal mill, a decrease in output, and an increase in power consumption, which will increase the operating cost of the coal mill. Now coal mills generally use Integral dynamic and static rings, and the wear of the dynamic and static rings is often uneven, and the integral dynamic and static rings often cause the failure of the dynamic or static rings due to severe wear of a part. Since the integral dynamic and static ring is used, the most common measure after failure is to replace it. When replacing the dynamic and static rings, it is first necessary to remove the separator first, and then remove the hydraulic device, pressure frame, grinding roller device, grinding disc, etc., and then replace the dynamic and static rings. The overall process is complicated, the workload is heavy, and the maintenance cost is also high. The overall It is time-consuming and labor-intensive, and the equipment maintenance period is long, which greatly affects the work and production.

Contents of the invention

The object of the present invention is to provide a layered and segmented dynamic and static ring of a coal mill, which can remove damaged dynamic or static rings in a targeted manner without overall removal, saving time and effort, and greatly reducing equipment maintenance costs.

The technical scheme adopted in the present invention is that the coal mill layered and segmented dynamic and static rings include the static ring and the dynamic ring arranged inside the static ring, the bottom of the static ring is connected with an integrally formed static ring base, and the static ring includes several segments The same static ring section; the moving ring includes several moving ring sections with the same structure, and the side of the moving ring close to the static ring is fixed with several moving ring separation teeth, and several moving ring separation teeth are evenly arranged along the circumference of the moving ring. The cross-section of the ring separation tooth is composed of a drop shape and a triangle shape, and the triangle structure is located on the tip side of the drop shape structure.

The present invention is also characterized in that,

The base of the static ring is in the shape of a ring, and there are several threaded holes on the base of the static ring. There are connecting holes corresponding to the threaded holes on the static ring section. A bolt a is passed through the connecting hole, and one end of the bolt a is connected to the threaded hole.

The cross-section of the moving ring section is in the shape of a 7, and the separating teeth of the moving ring are fixed on the outside of the long side of the 7 shape, and the short side of the moving ring section has a mounting hole.

A bolt b is passed through the mounting hole, and the moving ring section is connected to the pallet through the bolt b.

Bolt b is an M24X80 inner hexagonal bolt.

Rotating nozzles are formed between the separating teeth of adjacent moving rings.

The static ring section is 8 to 10 sections.

The moving ring section is 6 sections.

Both the moving ring section and the static ring section are made of cermet.

The beneficial effect of the present invention is,

(1) The layered and segmented dynamic and static rings of the present invention are designed by segmenting and layering the dynamic and static rings. When the dynamic and static rings are repaired and replaced, only the dynamic and static rings of the damaged section need to be replaced, and the entire equipment does not need to be dismantled, which reduces the maintenance cost. And maintenance time, to ensure the efficiency of equipment.

(2) The layered and segmented dynamic and static rings of the present invention are entirely cast with cermet material, which greatly improves the wear resistance of the dynamic and static rings and prolongs the service life of the dynamic and static rings.

Description of drawings

Fig. 1 is a schematic structural view of the layered and segmented dynamic and static rings of the coal mill of the present invention;

Fig. 2 is a cross-sectional view of the layered and segmented dynamic and static rings of the coal mill of the present invention;

Fig. 3 is a schematic diagram of the structure of the separating teeth of the moving ring in the layered and segmented moving and static rings of the coal mill of the present invention.

In the figure, 1. Static ring, 1-1. Static ring section, 2. Moving ring, 2-1. Moving ring section, 3. Static ring base, 4. Tray, 5. Rotating nozzle, 6. Bolt a, 7 . Bolt b, 8. Threaded hole, 9. Mounting hole, 10. Connecting hole, 11. Moving ring separating teeth.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The structure of the layered and segmented dynamic and static rings of the coal mill of the present invention is shown in Figure 1, including a static ring 1 and a dynamic ring 2 arranged inside the static ring 1. The bottom of the static ring 1 is connected with an integrally formed static ring base 3. The ring base 3 is in the shape of a ring, and there are several threaded holes 8 on the connecting surface with the static ring 1. The static ring 1 includes several static ring segments 1-1 with the same structure, the static ring segment 1-1 is arc-shaped, and several segments of the static ring segment 1 -1 connected end to end to form a ring-shaped static ring 1, when a certain static ring section 1-1 in the static ring 1 is damaged due to long-term work, the damaged static ring section 1-1 can be directly removed without dismantling the entire device, and Since the structures of the static ring sections 1-1 are the same, each static ring section 1-1 is interchangeable, which facilitates the installation of the equipment and reduces the original long-term maintenance and replacement period to only a few days, greatly improved work efficiency.

Preferably, the static ring section 1-1 has 8 to 10 sections, and the static ring section 1-1 is provided with a connecting hole 10 at a position corresponding to the threaded hole 8 .

The moving ring 2 also includes several moving ring sections 2-1 with the same structure, the moving ring section 2-1 is arc-shaped, and the moving ring section 2-1 has a mounting hole 9, and the moving ring section 2-1 is close to the static ring 1 One side is fixed with several moving ring separating teeth 11, and several moving ring separating teeth 11 are evenly distributed along the circumferential direction of the moving ring, and a rotating nozzle 5 is formed between adjacent moving ring separating teeth 11;

Preferably, the moving ring section 2-1 is composed of 6 sections, and the moving ring section 2-1 and the static ring section 1-1 are all cast from cermet material, specifically, high chromium and ceramics are compositely cast at one time, and the surface hardness is Reaching above HRC61, compared with the existing equipment, the hardness and wear resistance have been greatly improved, and the service life of the coal grinding motor ring 2 and the static ring 1 has been greatly extended.

As shown in Figure 2, the static ring section 1-1 is connected to the static ring base 3 through the bolt a6, the bolt a6 is located in the connection hole 10, and one end of the bolt a6 is connected to the threaded hole 8; the installation hole 9 of the moving ring section 2-1 There is a bolt b7 inside, and the moving ring section 2-1 is connected to the pallet 4 through the bolt b7; the bolt b7 is an M24X80 hexagonal inner bolt, and the strength of the M24X80 hexagonal inner bolt is 10.9, which can ensure the long-term operation of the moving ring 2 and the pallet 4. Bolt shearing does not occur.

The cross section of the moving ring section 2-1 is in the shape of a 7, the moving ring separating teeth 11 are fixed on the outer side of the long side of the 7, and the mounting hole 9 is located on the short side of the moving ring section 2-1.

As shown in Figure 3, the cross-section of the moving ring separation tooth 11 is composed of a water drop shape and a triangle shape. The triangle structure is located on the tip side of the water drop shape structure, which greatly reduces the primary wind blowing through the rotating nozzle 5 to rinse the static ring of the coal mill barrel. 1 The above parts, roller frame and loading frame reduce the primary wind resistance and increase the output of the coal mill by more than 10%.

When assembling the layered and segmented dynamic and static rings of the coal mill of the present invention, first connect the 6 segments of the dynamic ring segments 2-1 end to end in sequence and connect them to the tray 4 through the bolt b7, and then connect the 10 segments of the static ring segments 1-1 in sequence end to end The static ring base 3 is connected with the static ring base 3 through the bolt a6, and the static ring base 3 is fixed with the coal mill shell, and the work can be started after fixing; when the dynamic ring 2 or the static ring 1 fails, judge which section of the dynamic If there is a problem with ring section 2-1 or static ring section 1-1, then remove the damaged dynamic ring section 2-1 and static ring section 1-1 for replacement, and assemble a new dynamic ring section 2-1 and static ring section After 1-1, check that there is no problem with the equipment and you can work again.

Claims (9)

1. The layered and sectional type moving and static ring of the coal mill is characterized by comprising a static ring (1) and a moving ring (2) arranged on the inner side of the static ring (1), wherein the bottom of the static ring (1) is connected with an integrally formed static ring base (3), and the static ring (1) comprises a plurality of static ring sections (1-1) with the same structure; the rotating ring (2) includes the same rotating ring section (2-1) of a plurality of section structures, rotating ring (2) are close to quiet ring (1) one side rigid coupling and have a plurality of rotating ring separation tooth (11), a plurality of rotating ring separation tooth (11) are evenly set up along rotating ring (2) circumference, rotating ring separation tooth (11) cross-section comprises water droplet form and triangle-shaped shape, the triangle-shaped structure is located the most advanced one side of water droplet form structure.

2. The layered and segmented dynamic and static ring of the coal mill as claimed in claim 1, wherein the static ring base (3) is circular, a plurality of threaded holes (8) are formed in the static ring base (3), connecting holes (10) corresponding to the threaded holes (8) are formed in the static ring segments (1-1), bolts a (6) are inserted into the connecting holes (10), and one ends of the bolts a (6) are connected with the threaded holes (8).

3. The layered and segmented dynamic and static ring of the coal mill as claimed in claim 2, wherein the cross section of the dynamic ring segment (2-1) is 7-shaped, the dynamic ring separating teeth (11) are fixedly connected to the outer side of the long side of the 7-shaped, and the short side of the dynamic ring segment (2-1) is provided with a mounting hole (9).

4. The layered and segmented dynamic and static ring of the coal mill as claimed in claim 3, wherein bolts b (7) are inserted into the mounting holes (9), and the dynamic ring segment (2-1) is connected with the tray (4) through the bolts b (7).

5. The coal mill layered segment static and dynamic ring as claimed in claim 4, wherein the bolts b (7) are M24X80 hexagon socket bolts.

6. The layered and segmented dynamic and static ring for a coal mill according to any of claims 1 to 5, characterized in that between adjacent separating teeth (11) of the dynamic ring a rotating nozzle (5) is formed.

7. The coal mill layered and segmented dynamic and static ring according to any one of the claims 1 to 5, wherein the static ring segment (1-1) is 8 to 10 segments.

8. The coal mill layered and segmented dynamic and static ring according to any one of claims 1 to 5, wherein the dynamic ring segment (2-1) is 6 segments.

9. The layered and segmented dynamic and static ring of the coal mill as claimed in any one of claims 1 to 5, wherein the dynamic ring segment (2-1) and the static ring segment (1-1) are made of metal ceramic.

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