CN110773277A - Combined metal ceramic composite integrated dynamic and static ring for coal mill and preparation method - Google Patents
Combined metal ceramic composite integrated dynamic and static ring for coal mill and preparation method Download PDFInfo
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- CN110773277A CN110773277A CN201911199921.4A CN201911199921A CN110773277A CN 110773277 A CN110773277 A CN 110773277A CN 201911199921 A CN201911199921 A CN 201911199921A CN 110773277 A CN110773277 A CN 110773277A
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- ring
- static
- coal mill
- movable ring
- movable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/003—Shape or construction of discs or rings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a combined metal ceramic composite integrated movable static ring of a coal mill and a preparation method, which relate to the technical field of coal mill devices and mainly comprise a static ring arranged on a shell bracket and a movable ring arranged on a grinding disc; the static ring comprises a plurality of arc static ring sections with the same structure, and the plurality of static ring sections are sequentially connected end to form the circular static ring; the movable ring comprises a plurality of arc-shaped movable ring sections with the same structure, and the plurality of movable ring sections are sequentially connected end to form the circular movable ring; and a plurality of moving ring separation teeth are uniformly arranged on the outer side of the moving ring. The dynamic and static rings manufactured by the preparation method of the combined metal ceramic composite integrated dynamic and static ring of the coal mill can ensure that the dynamic and static rings of the medium-speed coal mill are easy to overhaul and the maintenance cost is reduced.
Description
Technical Field
The invention relates to the technical field of coal mill devices, in particular to a combined metal ceramic composite integrated dynamic and static ring of a coal mill and a preparation method thereof.
Background
The medium-speed coal mill is a coal mill with the working speed of 50-300 r/min, the motor drives the grinding disc to rotate through the speed reducer, materials fall in the center of the grinding disc from the feeding hole through the air locking feeder, and meanwhile hot air enters the mill from the air inlet. Along with the rotation of the millstone, the materials move towards the edge of the millstone under the action of centrifugal force, and are crushed by the grinding roller when passing through an annular groove on the millstone, the crushed materials are blown up by primary air entering the periphery of the grinding ring through a movable ring at the edge of the millstone, large particles directly fall on the millstone for re-crushing, the materials in the air flow fall on the millstone for re-grinding under the action of a rotary rotor when passing through an upper separator, coarse powder falls on the millstone from a cone hopper for re-grinding, qualified fine powder is discharged out of the mill along with the air flow, and the qualified fine powder is collected through.
The static ring of the medium speed coal mill is arranged on the shell bracket, and the grinding disc moving ring is connected with the grinding disc and rotates together with the grinding disc. There is a certain gap between the moving and static rings of the grinding disc. The hot air for conveying pulverized coal and dry raw coal, namely primary air, uniformly enters the periphery of the grinding ring through the movable ring, pulverized coal mixture thrown out from the grinding ring along the circumferential direction is dried and conveyed to the separator for separation, coarse powder is separated out and returned to the grinding ring for regrinding, qualified milled powder is brought to a hearth through the primary air, and impurities such as pebble coal, iron blocks and the like which are difficult to crush and are heavy fall back to the primary air chamber through the movable ring and are discharged to the slag discharge box through the scraper.
After a medium-speed coal mill runs for a period of time, the dynamic and static rings are often severely worn due to wind erosion, erosion of impurities such as pebble coal, iron blocks and the like, particularly, the static rings are worn through at the nozzle throat of the dynamic rings and the upper parts of the static rings even for some time to cause primary wind leakage of the coal mill, so that the pebble coal quantity of the coal mill is increased, the output is reduced, the power consumption is increased and the like, the running cost of the coal mill is increased, the existing coal mill generally adopts the integral dynamic and static rings, the abrasion of the dynamic rings and the static rings is often uneven, and the integral dynamic and static rings often cause failure of the dynamic rings or the static rings due to the local severe abrasion. Because the integral dynamic and static rings are adopted, the most commonly adopted measure after the failure is replacement. When the movable ring is replaced, the separator needs to be removed firstly according to the maintenance procedure of the coal mill, then the hydraulic device, the pressing frame, the grinding roller device, the grinding disc and the like are removed, and then the movable ring and the static ring can be replaced. Therefore, the equipment overhaul period is long. (2) The shutdown time is long due to the replacement of the movable ring and the static ring (the coal mill needs to be shut down and cannot be used for production when the grinding roller is maintained and replaced), and the production is influenced. (3) The whole movable ring or the whole static ring is replaced due to the local wear failure of the movable ring and the static ring, so that the equipment maintenance cost is high, the workload is large, and the maintenance process is complex.
Disclosure of Invention
The invention aims to provide a combined metal ceramic composite integrated dynamic and static ring of a coal mill and a preparation method thereof, which are used for solving the problems in the prior art, so that the dynamic and static rings of a medium-speed coal mill are easy to overhaul, and the maintenance cost is reduced.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a combined metal ceramic composite integrated dynamic static ring of a coal mill, which comprises a static ring arranged on a shell bracket and a dynamic ring arranged on a grinding disc; the static ring comprises a plurality of arc static ring sections with the same structure, and the plurality of static ring sections are sequentially connected end to form the circular static ring; the movable ring comprises a plurality of arc-shaped movable ring sections with the same structure, and the plurality of movable ring sections are sequentially connected end to form the circular movable ring; and a plurality of moving ring separation teeth are uniformly arranged on the outer side of the moving ring.
Optionally, the stationary ring section includes integrated into one piece's diaphragm and vertical board, diaphragm and vertical board junction are level and smooth circular arc structure, the diaphragm outside is connected with the extension board, the mounting hole has been seted up on the diaphragm.
Optionally, a wedge-shaped reinforcing block is connected between the transverse plate and the vertical plate.
Optionally, the section of the moving ring section is of an L-shaped structure, the moving ring separating teeth are arranged on the outer side of the long edge of the moving ring section, and the short edge of the moving ring section is provided with a connecting hole.
Optionally, the moving ring separation tooth includes that integrated into one piece's cross-section is drop-shaped structure and cross-section is the triangle-shaped structure, and the triangle-shaped structure is located one side at drop-shaped structure pointed end.
The invention also provides a preparation method of the combined metal ceramic composite integrated coal mill dynamic and static ring, which comprises the following steps:
step one; respectively casting the static ring sections with required quantity, and respectively machining after casting; fixedly connecting the static ring sections with the shell bracket sequentially from head to tail to form a static ring;
step two; mixing the zirconia ceramic micro powder with the viscose, and granulating to obtain zirconia ceramic particles;
step three; putting the zirconia ceramic particles into a rice-shaped aluminum pot for drying and forming to obtain a zirconia ceramic-aluminum pot forming body, wherein the drying and forming temperature is 80-120 ℃, and the drying time is 3-5 hours;
step four; and placing a plurality of zirconia ceramic-aluminum tank forming bodies in a casting mould cavity, arranging an anti-overflow cover on the periphery of the zirconia ceramic-aluminum tank forming bodies, performing one-time casting forming to obtain a metal ceramic composite integrated coal grinding mechanical ring section, and fixedly connecting a plurality of movable ring sections sequentially from head to tail with a grinding disc to form a movable ring.
Compared with the prior art, the invention has the following technical effects:
the separating tooth of the movable ring has the characteristics of small surface area and relatively thin thickness, and the molten steel temperature reduction speed of the grinding roller is increased by 40 percent compared with that of the grinding roller in the original patent in the casting and forming process, so that the forming is more difficult. Therefore, in the molding process of the metal ceramic moving ring separating tooth, a unique Chinese character 'mi' -shaped prefabricated body is designed according to the structural characteristics of the metal ceramic moving ring separating tooth, so that ceramic particles can be quickly and uniformly diffused at a proper temperature (the cylindrical ceramic prefabricated body is generally suitable for preparing a large-area composite layer with the thickness of more than 25 mm). And an anti-overflow cover is additionally arranged at the edge position of the separating tooth to be formed. The overflow-proof cover is made of heat-resistant steel, and the aperture of the overflow-proof cover is smaller than the grain diameter of the ceramic ball, so that ceramic micro powder is effectively prevented from flowing to other parts during pouring. After pouring, the anti-overflow cover and the separating teeth are fused together, and the overall performance of the movable ring is not influenced. According to the shape of the moving ring separation teeth, the anti-overflow cover is a butterfly-shaped anti-overflow cover.
When casting, the aluminum pot (with the melting point of about 660 ℃) in the zirconia ceramic-aluminum pot forming body is firstly melted, the zirconia ceramic particles can burst, the released zirconia ceramic micro powder is fully mixed with the molten metal, and a wear-resistant composite layer is formed on the outer surface of the moving ring matrix. The method has the advantages that the pouring mode of multi-pouring gate and U-shaped pouring gate (wherein the sizes of pouring cups and pouring gates are determined according to the size of a casting, and the flow rate of molten metal is controlled) and the pouring temperature (casting material Cr20, the pouring temperature is about 1350 ℃) are adopted, so that the flow rate of the molten metal is limited to 40-60 mm/min, an even wear-resistant composite layer is favorably formed, the problem of uneven distribution of zirconia ceramic micro powder in the wear-resistant composite layer caused by scouring of the molten metal on the zirconia ceramic micro powder is avoided, and the wear resistance of the moving ring separation teeth is improved. The formed wear-resistant layer is located on the surface of the outer protrusion of the movable ring, and the thickness of the wear-resistant layer is 12-15 mm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of a stationary ring segment according to the present invention;
FIG. 2 is a cross-sectional view of the stationary ring segment A-A of the present invention;
FIG. 3 is a cross-sectional view of the stationary ring segment B-B of the present invention;
FIG. 4 is an enlarged view of a portion of the stationary ring segment C of the present invention;
FIG. 5 is a schematic structural diagram of a moving ring segment according to the present invention;
FIG. 6 is a cross-sectional view of the dynamic ring segment A-A of the present invention;
FIG. 7 is a cross-sectional view of the moving ring segment B-B of the present invention;
FIG. 8 is a partially enlarged view of the structure of the moving ring separating teeth of the moving ring segment according to the present invention;
wherein, 1 is a static ring section, 101 is a transverse plate, 102 is a vertical plate, 103 is an extension plate, 104 is a mounting hole, 105 is a reinforcing block, 2 is a moving ring section, 201 is a connecting hole, and 3 is a moving ring separating tooth.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a combined metal ceramic composite integrated dynamic and static ring of a coal mill and a preparation method thereof, which are used for solving the problems in the prior art, so that the dynamic and static rings of a medium-speed coal mill are easy to overhaul, and the maintenance cost is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a combined metal ceramic composite integrated dynamic static ring of a coal mill, which comprises a static ring arranged on a shell bracket and a dynamic ring arranged on a grinding disc, wherein the static ring is arranged on the shell bracket; the static ring comprises a plurality of arc-shaped static ring sections 1 with the same structure, and the plurality of static ring sections 1 are sequentially connected end to form a circular static ring; the movable ring comprises a plurality of arc-shaped movable ring sections 2 with the same structure, and the plurality of movable ring sections 2 are sequentially connected end to form a circular movable ring; a plurality of moving ring separating teeth 3 are uniformly arranged on the outer side of the moving ring. The static ring segment 1 comprises a transverse plate 101 and a vertical plate 102 which are integrally formed, the joint of the transverse plate 101 and the vertical plate 102 is of a smooth arc structure, an extension plate 103 is connected to the outer side of the transverse plate 101, a mounting hole 104 is formed in the transverse plate 101, and a wedge-shaped reinforcing block 105 is connected between the transverse plate 101 and the vertical plate 102.
The section of the movable ring section 2 is of an L-shaped structure, the movable ring separating teeth 3 are arranged on the outer side of the long edge of the movable ring section 2, and the short edge of the movable ring section is provided with a connecting hole 201. The moving ring separation tooth 3 comprises a head part and a tail part which are integrally formed, the section of the head part is of a water drop-shaped structure, the section of the tail part is of a triangular structure, and the triangular structure is positioned on one side of the tip end of the water drop-shaped structure.
The invention also provides a preparation method of the combined metal ceramic composite integrated coal mill dynamic and static ring, which comprises the following steps:
step one; respectively casting the static ring sections with required quantity, and respectively machining after casting; fixedly connecting the static ring segments 1 with the shell bracket end to end in sequence to form a static ring;
step two; for the movable ring separating tooth 3 which is easy to wear, the metal ceramic composite material is adopted for preparation so as to improve the wear resistance of the movable ring separating tooth, and the zirconia ceramic micro powder and the viscose are mixed and then granulated to obtain zirconia ceramic particles;
step three; putting the zirconia ceramic particles into a rice-shaped aluminum pot for drying and forming to obtain a zirconia ceramic-aluminum pot forming body, wherein the drying and forming temperature is 80-120 ℃, and the drying time is 3-5 hours; in the drying and forming process, the solvent in the viscose volatilizes to form spheres with the granularity of 0.2-0.3 mm.
Step four; and placing a plurality of zirconia ceramic-aluminum tank forming bodies in a casting mould cavity, arranging an anti-overflow cover at the periphery of the zirconia ceramic-aluminum tank forming bodies, performing one-time casting forming to obtain a metal ceramic composite integrated coal mill movable ring section 2, and fixedly connecting the head and the tail of a plurality of movable ring sections 2 with a grinding disc in sequence to form a movable ring. After heat treatment, the hardness of the matrix is 57HRC, and the wear resistance is good. The service life of the medium speed coal mill moving ring with the separation teeth cast by the metal ceramic composite material can reach more than 3 ten thousand hours, and the service life of the moving ring cast by Cr20 is about 1 ten thousand hours generally.
According to the invention, the easily-worn part of the movable ring is prepared by using the metal ceramic, and the movable ring separates the teeth, so that the service life of the movable ring and the static ring is effectively prolonged. The combined design of the movable ring and the static ring ensures that only the abrasion failure part needs to be replaced when the movable ring and the static ring are maintained and replaced, the whole replacement is not needed, other parts of the coal mill do not need to be detached when the movable ring and the static ring are replaced, the maintenance is convenient, the maintenance time is short, and the maintenance cost is lower. The invention adopts one-step casting molding, and saves procedures compared with the secondary casting molding process of the grinding roller disclosed by the original patent.
Example 1: the stationary ring of the sectional ZGM95G medium speed coal mill is cast by a casting material Cr20 in 6 sections, the casting temperature is 1400 ℃, and the stationary ring is assembled and used after forced air cooling heat treatment, and the effect is good.
Example 2: the moving ring of the ZGM95G medium speed coal mill is integrally prepared from metal ceramics, the separating tooth part of the moving ring is cast once by adopting metal ceramic composite materials (the metal matrix material is Cr20, the reinforced ceramics are zirconia ceramic micro powder), the other part of the moving ring is cast by high-chromium cast iron Cr20 and is cast in 6 sections, the casting temperature is 1340 ℃, the moving ring is assembled and used after forced air cooling heat treatment, the wear resistance is good, the service life is 30200 hours, and the local damage and the replacement are convenient.
Claims (6)
1. The utility model provides a compound integrated coal pulverizer of modular cermet moves quiet ring which characterized in that: comprises a static ring arranged on a shell bracket and a dynamic ring arranged on a grinding disc; the static ring comprises a plurality of arc static ring sections with the same structure, and the plurality of static ring sections are sequentially connected end to form the circular static ring; the movable ring comprises a plurality of arc-shaped movable ring sections with the same structure, and the plurality of movable ring sections are sequentially connected end to form the circular movable ring; and a plurality of moving ring separation teeth are uniformly arranged on the outer side of the moving ring.
2. The combined metal ceramic composite integrated coal mill motor stationary ring according to claim 1, characterized in that: the quiet ring section includes integrated into one piece's diaphragm and vertical board, diaphragm and vertical board junction are level and smooth circular arc structure, the diaphragm outside is connected with the extension board, the mounting hole has been seted up on the diaphragm.
3. The combined metal ceramic composite integrated coal mill motor stationary ring according to claim 2, characterized in that: and a wedge-shaped reinforcing block is connected between the transverse plate and the vertical plate.
4. The combined metal ceramic composite integrated coal mill motor stationary ring according to claim 1, characterized in that: the section of the movable ring section is of an L-shaped structure, the movable ring separating teeth are arranged on the outer sides of the long edges of the movable ring section, and the short edges of the movable ring section are provided with connecting holes.
5. The combined metal ceramic composite integrated coal mill motor stationary ring according to claim 1, characterized in that: the movable ring separation tooth comprises an integrally formed water-drop-shaped structure and a triangular structure, wherein the cross section of the integrally formed water-drop-shaped structure is located on one side of the tip end of the water-drop-shaped structure.
6. A preparation method of a combined metal ceramic composite integrated coal mill dynamic and static ring is characterized by comprising the following steps: the method comprises the following steps:
step one; respectively casting the static ring sections with required quantity, and respectively machining after casting; fixedly connecting the static ring sections with the shell bracket sequentially from head to tail to form a static ring;
step two; mixing the zirconia ceramic micro powder with the viscose, and granulating to obtain zirconia ceramic particles;
step three; putting the zirconia ceramic particles into a rice-shaped aluminum pot for drying and forming to obtain a zirconia ceramic-aluminum pot forming body, wherein the drying and forming temperature is 80-120 ℃, and the drying time is 3-5 hours;
step four; and placing a plurality of zirconia ceramic-aluminum tank forming bodies in a casting mould cavity, arranging an anti-overflow cover on the periphery of the zirconia ceramic-aluminum tank forming bodies, performing one-time casting forming to obtain a metal ceramic composite integrated coal grinding mechanical ring section, and fixedly connecting a plurality of movable ring sections sequentially from head to tail with a grinding disc to form a movable ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911199921.4A CN110773277A (en) | 2019-11-29 | 2019-11-29 | Combined metal ceramic composite integrated dynamic and static ring for coal mill and preparation method |
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| CN201911199921.4A CN110773277A (en) | 2019-11-29 | 2019-11-29 | Combined metal ceramic composite integrated dynamic and static ring for coal mill and preparation method |
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| CN110773277A true CN110773277A (en) | 2020-02-11 |
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| CN201911199921.4A Pending CN110773277A (en) | 2019-11-29 | 2019-11-29 | Combined metal ceramic composite integrated dynamic and static ring for coal mill and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115515716A (en) * | 2020-04-16 | 2022-12-23 | 德国莱歇公司 | Keyed abrasive disc segments, abrasive disc segment systems, and related methods |
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2019
- 2019-11-29 CN CN201911199921.4A patent/CN110773277A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115515716A (en) * | 2020-04-16 | 2022-12-23 | 德国莱歇公司 | Keyed abrasive disc segments, abrasive disc segment systems, and related methods |
| CN115515716B (en) * | 2020-04-16 | 2023-12-26 | 德国莱歇公司 | Key mill segment, mill segment system and related methods |
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