CN215541642U

CN215541642U - Sealing structure of coal mill

Info

Publication number: CN215541642U
Application number: CN202122137958.3U
Authority: CN
Inventors: 李昊琪; 周润泽; 刘洪昇
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2022-01-18
Anticipated expiration: 2031-09-06

Abstract

The utility model discloses a sealing structure of a coal mill, belongs to the field of coal mills, and aims to solve the problems that the sealing effect is poor, dust can enter a dynamic sealing part of a transmission shaft to cause abrasion, and the dust is easy to generate backflow; through the arrangement of the sealing bearing, the sealing ring, the gas blowing pipe and the cleaning structure, the sealing bearing and the sealing ring can seal between the transmission shaft and the base, so that the gradual abrasion of the dynamic seal caused by the fact that the coal briquette and the coal dust enter the dynamic seal position is avoided, the sealing effect of the whole coal mill base is improved, the gas blowing pipe and the cleaning structure can clean the coal briquette and the coal dust falling into the upper surface of the base and blow the coal briquette and the coal dust into the discharging chute, and the coal briquette and the coal dust are prevented from entering the dynamic seal position; through the setting of anti-return structure and striker plate, anti-return structure can utilize hot blast pressure to realize the one-way switch-on between sealed wind cavity and the ejection of compact chamber to prevent the dust the backward flow condition to appear, the striker plate can block the buggy of backward flow simultaneously, makes its discharge smoothly.

Description

Sealing structure of coal mill

Technical Field

The utility model relates to the field of coal mills, in particular to a sealing structure of a coal mill.

Background

Coal mills are machines for breaking up and grinding coal briquettes into coal dust, which are important auxiliary equipment for coal dust furnaces. The coal mill is the core equipment of thermal power generation, and is directly related to the normal operation of a generator set. The coal mill has the models of a vertical pulverizer, a high-pressure suspension roller mill, a medium-speed micro-powder mill, an overpressure trapezoidal mill, a Raymond mill and the like. The coal grinding process is a process in which coal is crushed and its surface area is increased continuously. To increase the new surface area, the binding force between solid molecules must be overcome, and thus energy is consumed. The coal is ground into coal powder in a coal mill mainly by three modes of crushing, smashing and grinding. Wherein the crushing process consumes the least amount of energy and the grinding process consumes the most amount of energy. The two or three modes of the various coal mills are combined in the pulverizing process, but the main mode is determined by the type of the coal mill.

Present milling machine that has certain drawback when using, sealed effect is not good, and the dust can get into the sealed shell lower extreme and the sealed department that moves of transmission shaft under the blowing of sealed wind cavity air current, and this can lead to the sealed shell lower extreme and the sealed wearing and tearing gradually that moves of transmission shaft, accelerates the decline of whole coal pulverizer base seal assembly's sealing performance, and the dust upwards blows the in-process at sealed wind cavity and produces the backward flow easily moreover.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, the utility model discloses a sealing structure of a coal mill, which adopts the technical scheme that the sealing structure comprises a sealing shell, a base, a transmission shaft, a turntable and a feeding pipe, wherein the base is arranged in the sealing shell, the transmission shaft is arranged in the base, the top of the transmission shaft is fixedly connected with the turntable, the feeding pipe is arranged above the turntable, a sealing air cavity is arranged in the sealing shell, a sealing bearing is arranged outside the transmission shaft in the base, a sealing ring is fixedly connected to the outside of the sealing bearing, the transmission shaft and the base can be sealed through the arrangement of the sealing bearing and the sealing ring, so that the gradual abrasion of the dynamic seal caused by the fact that coal blocks and coal powder enter the dynamic seal is avoided, the sealing effect of the base of the whole coal mill is improved, and the base is internally provided with the pipe, the coal blocks and the coal dust falling into the upper surface of the base can be blown into the discharging chute by the arrangement of the air blowing pipe to be prevented from entering the dynamic seal position, the lower surface of the rotary table is provided with the cleaning structure, the cleaning structure can be driven to clean the upper surface of the base along with the rotation of the rotary table by the arrangement of the cleaning structure, so that the coal blocks and the coal dust on the upper surface of the base are swept into the discharging chute, the discharging chute is arranged between the seal shell and the base, the coal blocks and the coal dust on the upper surface of the base can be timely discharged by the arrangement of the discharging chute, the abrasion of the dynamic seal position is avoided, the discharging cavity is arranged above the seal air cavity and positioned outside the feeding pipe, the coal dust can be discharged from the upper part by the arrangement of the discharging cavity, the backflow preventing structure is arranged between the seal air cavity and the discharging cavity, and the one-way conduction between the seal air cavity and the discharging cavity can be realized by the hot air pressure by the arrangement of the backflow preventing structure, thereby prevent that the dust from appearing the backward flow condition, one side of anti-return structure is provided with the striker plate, through the setting of striker plate, can block the buggy of backward flow, makes it discharge smoothly.

As a preferred technical scheme of the utility model, a material sliding inclined plate is arranged between the sealing shell and the discharge chute, an oblique angle is arranged at the top of the sealing ring, and the coal briquette and the coal dust can smoothly fall down through the arrangement of the material sliding inclined plate and the oblique angle, so that the blockage is avoided.

According to a preferable technical scheme of the utility model, the sweeping structure comprises a connecting block and a brush head, the lower surface of the rotary table is fixedly connected with the connecting block, the brush head is fixedly connected below the connecting block, and the connecting block and the brush head can be driven to rotate along with the rotation of the rotary table through the arrangement of the connecting block and the brush head, so that the sweeping of coal briquettes and coal dust on the upper surface of the base is realized.

As a preferable technical scheme, the backflow prevention structure comprises a movable shaft and a movable baffle, the movable shaft is arranged between the sealed air cavity and the discharging cavity inside the sealing shell, the movable baffle is movably connected below the movable shaft, the movable baffle can be automatically opened by hot air pressure during blowing, and the movable baffle is closed to prevent backflow during backflow.

As a preferred technical scheme of the utility model, the top of the sealed air cavity and the bottom of the discharging cavity are both provided with arc-shaped grooves, and dust can be smoothly discharged through the arrangement of the arc-shaped grooves, so that the dust is prevented from being accumulated.

As a preferable technical scheme of the utility model, the bottom end of the discharge pipe is conical, the air blowing pipe faces one side of the discharge chute, and the conical arrangement of the discharge pipe can reduce the caliber of the bottom of the discharge pipe and reduce the entering amount of dust.

The utility model has the beneficial effects that: according to the coal pulverizer base, the sealing bearing, the sealing ring, the air blowing pipe and the cleaning structure are arranged in a matched mode, the sealing bearing and the sealing ring can seal the space between the transmission shaft and the base, so that the dynamic seal is prevented from being gradually abraded when coal blocks and coal dust enter the dynamic seal position, the sealing effect of the whole coal pulverizer base is improved, the air blowing pipe can blow the coal blocks and the coal dust falling into the upper surface of the base into the discharging chute, the coal blocks and the coal dust are prevented from entering the dynamic seal position, the cleaning structure can drive the cleaning structure to clean the upper surface of the base along with the rotation of the rotary table, and the coal blocks and the coal dust on the upper surface of the base are swept into the discharging chute; through the cooperation setting of anti-return structure and striker plate, anti-return structure can utilize hot blast pressure to realize the one-way switch-on between sealed wind cavity and the ejection of compact chamber to prevent the dust the backward flow condition to appear, the striker plate can block the buggy of backward flow simultaneously, makes its discharge smoothly.

Drawings

FIG. 1 is a schematic cross-sectional front view of the present invention;

FIG. 2 is an enlarged schematic view of the structure at the position A of the present invention;

FIG. 3 is an enlarged view of the structure of the present invention at B.

In the figure: 1-sealing shell, 2-base, 3-transmission shaft, 4-rotary table, 5-feeding pipe, 6-sealing air chamber, 7-sealing bearing, 8-sealing ring, 9-air blowing pipe, 10-cleaning structure, 1001-connecting block, 1002-brush head, 11-discharging chute, 12-discharging chamber, 13-backflow preventing structure, 1301-movable shaft, 1302-movable baffle, 14-striker plate, 15-sliding material inclined plate, 16-bevel angle and 17-arc groove.

Detailed Description

Example 1

As shown in fig. 1 to 3, the utility model discloses a sealing structure of a coal mill, which adopts the technical scheme that the sealing structure comprises a sealing shell 1, a base 2, a transmission shaft 3, a rotary table 4 and a feeding pipe 5, wherein the base 2 is arranged inside the sealing shell 1, the transmission shaft 3 is arranged inside the base 2, the rotary table 4 is fixedly connected to the top of the transmission shaft 3, the feeding pipe 5 is arranged above the rotary table 4, a sealing air chamber 6 is arranged inside the sealing shell 1, a sealing bearing 7 is arranged inside the base 2 and positioned outside the transmission shaft 3, a sealing ring 8 is fixedly connected to the outside of the sealing bearing 7, when the transmission shaft 3 rotates, the sealing bearing 7 and the sealing ring 8 seal between the transmission shaft 3 and the base 2, so that the dynamic seal is prevented from being gradually worn due to the fact that coal briquettes and pulverized coal enter the dynamic seal, and the sealing effect of the base of the whole coal mill is improved, the coal dust cleaning device is characterized in that an air blowing pipe 9 is arranged inside the base 2, coal blocks and coal dust falling into the upper surface of the base 2 can be blown into a discharging chute 11 by the air blowing pipe 9 to be prevented from entering a dynamic seal position, a cleaning structure 10 is arranged on the lower surface of the rotating disc 4, the rotating disc 4 is driven along with the transmission shaft 3 to clean the upper surface of the base 2, so that the coal blocks and the coal dust on the upper surface of the base 2 are swept into the discharging chute 11, the discharging chute 11 is arranged between the seal shell 1 and the base 2 in a rotating manner, the coal blocks and the coal dust falling into the discharging chute 11 can be discharged and collected in time, the blockage caused by accumulation is avoided, a discharging cavity 12 is arranged above the seal air cavity 6 and positioned on the outer side of the feeding pipe 5, the discharging cavity 12 can discharge the coal dust from the upper part, a backflow preventing structure 13 is arranged between the seal air cavity 6 and the discharging cavity 12, when the coal dust enters the discharging cavity 12 from the seal air cavity 6, utilize hot blast pressure can make backflow prevention structure 13 one-way switch on to prevent the dust the backward flow condition to appear, one side of backflow prevention structure 13 is provided with striker plate 14, and striker plate 14 can block the buggy of backward flow, makes it discharge smoothly.

As a preferred technical scheme of the utility model, a sliding material inclined plate 15 is arranged between the sealing shell 1 and the discharge chute 11, an inclined angle 16 is arranged at the top of the sealing ring 8, and the sliding material inclined plate 15 and the inclined angle 16 can smoothly slide coal blocks and coal powder to avoid blockage.

As a preferred technical solution of the present invention, the cleaning structure 10 includes a connecting block 1001 and a brush head 1002, the lower surface of the rotating disc 4 is fixedly connected with the connecting block 1001, the brush head 1002 is fixedly connected below the connecting block 1001, and when the rotating disc 4 rotates, the connecting block 1001 and the brush head 1002 are driven to rotate, so as to clean coal briquettes and coal dust on the upper surface of the base 2.

As a preferred technical solution of the present invention, the backflow prevention structure 13 includes a movable shaft 1301 and a movable baffle 1302, the movable shaft 1301 is disposed between the sealed air chamber 6 and the discharge chamber 12 inside the sealed housing 1, the movable baffle 1302 is movably connected below the movable shaft 1301, when blowing material, the movable baffle 1302 is automatically opened by hot air pressure, and when backflow occurs, the movable baffle 1302 is closed to prevent backflow.

As a preferred technical scheme of the utility model, the top of the sealed air chamber 6 and the bottom of the discharging chamber 12 are both provided with arc-shaped grooves 17, and the arc-shaped grooves 17 can discharge dust smoothly to avoid accumulation.

As a preferable technical scheme of the utility model, the bottom end of the feeding pipe 5 is conical, the air blowing pipe 9 faces one side of the discharging chute 11, and the feeding pipe 5 with the conical bottom end can reduce the caliber of the bottom of the discharging pipe 5 and reduce the entering amount of dust.

The working principle of the utility model is as follows: firstly, coal blocks are added into a sealing shell 1 from a feeding pipe 5, a transmission shaft 3 drives a rotary table 4 to grind the coal blocks, when the transmission shaft 3 rotates, a sealing bearing 7 and a sealing ring 8 seal between the transmission shaft 3 and a base 2, so that the coal blocks and coal dust are prevented from entering a dynamic seal position to cause gradual abrasion of the dynamic seal, the sealing effect of the base of the whole coal mill is improved, the coal blocks and the coal dust falling into the upper surface of the base 2 are blown into a discharge chute 11 by an air blowing pipe 9 to be prevented from entering the dynamic seal position, meanwhile, the rotary table 4 drives a connecting block 1001 and a brush head 1002 to rotate, the coal blocks and the coal dust on the upper surface of the base 2 are cleaned, a sliding material inclined plate 15 and an inclined angle 16 smoothly fall the coal blocks and the coal dust into the discharge chute 11, the coal blocks and the coal dust falling into the discharge chute 11 are discharged and collected in time, so as to avoid blockage caused by accumulation, when the coal dust enters a discharge cavity 12 from a sealing air cavity 6, the movable baffle 1302 is automatically opened by hot air pressure, when backflow is generated, the movable baffle 1302 is closed to prevent backflow, so that the dust is prevented from flowing back, the striker plate 14 blocks the backflow pulverized coal,

make it discharge smoothly, the inlet pipe 5 that the bottom is the toper simultaneously can reduce the bore of 5 bottoms of discharging pipes, reduces the admission capacity of dust.

The mechanical connection according to the utility model is a conventional means used by the skilled person and can be suggested by limited trials and is common general knowledge.

Components not described in detail herein are prior art.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications without inventive changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims

1. The utility model provides a seal structure of coal pulverizer, includes sealed shell (1), base (2), transmission shaft (3), carousel (4) and inlet pipe (5), the inside of sealed shell (1) is provided with base (2), the inside of base (2) is provided with transmission shaft (3), the top fixedly connected with carousel (4) of transmission shaft (3), the top of carousel (4) is provided with inlet pipe (5), its characterized in that: the inside of seal shell (1) is provided with sealed wind cavity (6), the outside that the inside of base (2) is located transmission shaft (3) is provided with sealed bearing (7), the outside fixedly connected with sealing washer (8) of sealed bearing (7), the inside of base (2) is provided with gas blow pipe (9), the lower surface of carousel (4) is provided with cleans structure (10), be provided with ejection of compact chute (11) between seal shell (1) and base (2), the outside that the top of sealed wind cavity (6) is located inlet pipe (5) is provided with ejection of compact chamber (12), be provided with between sealed wind cavity (6) and ejection of compact chamber (12) anti-return structure (13), one side of anti-return structure (13) is provided with striker plate (14).

2. The sealing structure of a coal pulverizer as defined in claim 1, wherein: a sliding material inclined plate (15) is arranged between the sealing shell (1) and the discharging chute (11), and an inclined angle (16) is arranged at the top of the sealing ring (8).

3. The sealing structure of a coal pulverizer as defined in claim 1, wherein: clean structure (10) including connecting block (1001) and brush head (1002), the lower surface fixedly connected with connecting block (1001) of carousel (4), the below fixedly connected with brush head (1002) of connecting block (1001).

4. The sealing structure of a coal pulverizer as defined in claim 1, wherein: the backflow prevention structure (13) comprises a movable shaft (1301) and a movable baffle (1302), the movable shaft (1301) is arranged between the sealed air chamber (6) and the discharging chamber (12) in the sealed shell (1), and the movable baffle (1302) is movably connected below the movable shaft (1301).

5. The sealing structure of a coal pulverizer as defined in claim 1, wherein: the top of the sealed air chamber (6) and the bottom of the discharging chamber (12) are both provided with arc-shaped grooves (17).

6. The sealing structure of a coal pulverizer as defined in claim 1, wherein: the bottom end of the feeding pipe (5) is conical, and the air blowing pipe (9) faces one side of the discharging chute (11).