Pulverized coal screening and filtering device of steel ball coal mill

Abstract

The utility model discloses a steel ball coal mill pulverized coal screening and filtering device which comprises a filtering device body, supporting legs are symmetrically arranged at the bottom of the filtering device body, a discharging port is formed in one side of the bottom of the filtering device body, and feeding ports are symmetrically formed in the top of the filtering device body. A guide pipe is arranged on the inner side of the top of the filtering device main body, a driving mechanism is arranged in the filtering device main body, and a grinding mechanism for grinding pulverized coal is arranged on the driving mechanism. Pulverized coal is ground into a proper size for multiple times in the outward moving process through centrifugal force, and the pulverized coal with the proper size is filtered out through the filtering holes.

Description

Technical Field

[0001] This utility model relates to the field of coal mill technology, and in particular to a coal powder screening and filtration device for a ball mill. Background Technology

[0002] A coal mill is a machine that crushes and grinds coal into pulverized coal. It is an important auxiliary equipment for pulverized coal boilers. There are many types of coal mills, mainly classified by speed into low-speed, medium-speed, and high-speed mills. Coal mills play a crucial role in actual production. Their main working process involves grinding coal into pulverized coal, which is then discharged through the mill's feed inlet and transported by a conveyor belt. The coal mill is the most important large-scale equipment in a pulverizing system; its operational safety and economy are extremely important for the normal operation of the entire pulverizing system.

[0003] A search revealed Chinese patent application number 202323545092.5, which discloses a coal powder screening and filtering device for a ball mill, relating to the field of coal powder processing. The device includes a barrel; a discharge port, shaped like a frustum, is fixedly connected to the bottom of the outer wall of the barrel and communicates with the barrel; a set of columns are fixedly connected to the outer wall of the discharge port; a feed inlet is fixedly connected to the top of the outer wall of the barrel and communicates with the barrel; and a filter screen is fixedly connected to the inner wall of the barrel. The filtering device in the aforementioned patent has the following drawbacks: its structure is complex, involving multiple components such as bevel gears and rotating rods, resulting in high maintenance costs. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a coal powder screening and filtration device for a ball mill.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A coal powder screening and filtering device for a ball mill includes a filter body. Support legs are symmetrically arranged at the bottom of the filter body. A discharge port is located on one side of the bottom of the filter body. Feed ports are symmetrically arranged at the top of the filter body. A guide tube is located on the inner side of the top of the filter body. A drive mechanism is installed inside the filter body. A grinding mechanism for grinding coal powder is installed on the drive mechanism. The drive mechanism includes a servo motor, which is installed on the inner side of the top of the filter body. A rotating shaft is installed at the output end of the servo motor. A sun gear is installed at the end of the rotating shaft away from the servo motor. A grinding disc is mounted on the outer wall of the sun gear away from the rotating shaft via a rod. A rotating seat is installed on the inner side of the bottom of the filter body, and the grinding disc is rotatably mounted on the rotating seat.

[0007] As a further improvement of this utility model: the grinding disc is provided with a protruding structure for grinding on the outer wall near the sun gear, and the grinding disc is provided with filter holes for filtering coal powder.

[0008] As a further embodiment of this utility model: the drive mechanism further includes a gear ring, which is mounted on the inner wall of the filter device body via a mounting bracket. A plurality of planetary gears are meshed between the sun gear and the gear ring, and the rolling mechanism is mounted on the bottom of the planetary gears.

[0009] As a further embodiment of this utility model: the rolling mechanism includes a grinding frame, the grinding frame has a trapezoidal structure, the grinding frame is installed on the bottom of the planetary gear through an adjustable bracket, and the bottom of the grinding frame is provided with a grinding groove.

[0010] As a further embodiment of this utility model: the rolling mechanism also includes a second grinding disc, the bottom of the grinding frame is provided with a groove, a rotating shaft is provided in the groove, and several second grinding discs are rotatably mounted on the rotating shaft, and a cover plate is installed on one side of the grinding frame by bolts.

[0011] As a further improvement of this utility model: the rolling mechanism also includes grinding balls, and the bottom of the toothed ring is provided with an annular groove, in which a plurality of grinding balls are arranged.

[0012] As a further improvement of this utility model, the filter device further includes a brush plate, which is installed on the left and right sides of the grinding frame.

[0013] As a further improvement of this utility model, the filtration device also includes a scraper, which is installed at the bottom of the first grinding disc. The scraper rotates as the first grinding disc rotates, sweeping the coal powder to the discharge port.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. By using a servo motor to drive the sun gear to rotate, the planetary gear and grinding disc one will rotate together. Coal powder slides outward on grinding disc one due to centrifugal force. During the sliding process, the grinding frame and grinding disc two crush the coal powder. The crushed coal powder flows out through the filter holes on grinding disc one. Unqualified coal powder continues to be crushed. During the rotation of the planetary gear, the grinding frame will rotate together. Through centrifugal force, the coal powder is crushed into a suitable size multiple times during the outward movement. The coal powder of the suitable size is filtered out through the filter holes. At the same time, the coal powder on the outer side is crushed at the end by the grinding balls, which improves the efficiency of crushing and filtration.

[0016] 2. The brush plate is used to clean the coal powder on the first grinding disc to prevent the filter holes on the first grinding disc from becoming clogged. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a coal powder screening and filtration device for a ball mill proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of a coal powder screening and filtration device for a ball mill proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the drive mechanism proposed in this utility model;

[0020] Figure 4 This is a schematic diagram of the bottom structure of the grinding disc proposed in this utility model;

[0021] Figure 5 This is a schematic diagram of the toothed ring and grinding ball proposed in this utility model;

[0022] Figure 6 This is a schematic diagram of the grinding mechanism proposed in this utility model.

[0023] In the diagram: 1-Main body of the filter device, 2-Inlet, 3-Outlet, 4-Support leg, 5-Conduit, 6-Drive mechanism, 7-Crushing mechanism, 8-Servo motor, 9-Rotating shaft, 10-Sun gear, 11-Gear ring, 12-Planetary gear, 13-Mounting bracket, 14-Grinding disc one, 15-Scraper, 16-Rotating seat, 17-Grinding ball, 18-Grinding frame, 19-Grinding groove, 20-Brush plate, 21-Cover plate, 22-Grinding disc two. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below with reference to specific embodiments.

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] A coal powder screening and filtration device for a ball mill, such as Figures 1-6As shown, the filter includes a filter body 1, with support legs 4 symmetrically arranged at the bottom of the filter body 1, a discharge port 3 on one side of the bottom of the filter body 1, a feed port 2 symmetrically arranged at the top of the filter body 1, a guide tube 5 arranged on the inner side of the top of the filter body 1, a drive mechanism 6 arranged inside the filter body 1, a grinding mechanism 7 for grinding coal powder arranged on the drive mechanism 6, the drive mechanism 6 includes a servo motor 8, the servo motor 8 is installed on the inner side of the top of the filter body 1, a rotating shaft 9 is installed at the output end of the servo motor 8, a sun gear 10 is installed at the end of the rotating shaft 9 away from the servo motor 8, a grinding disc 14 is installed on the outer wall of the sun gear 10 away from the rotating shaft 9 by means of a rod, a rotating seat 16 is installed on the inner side of the bottom of the filter body 1, and the grinding disc 14 is rotatably mounted on the rotating seat 16;

[0027] The grinding disc 14 has a raised structure for grinding on its outer wall near the sun gear 10. The grinding disc 14 has filter holes for filtering coal powder. The size of the filter holes can be adjusted according to actual needs.

[0028] This device is further configured such as Figure 2 , Figure 3 As shown, the drive mechanism 6 also includes a gear ring 11, which is mounted on the inner wall of the filter device body 1 via a mounting bracket 13. Several planetary gears 12 are meshed between the sun gear 10 and the gear ring 11, and the rolling mechanism 7 is mounted on the bottom of the planetary gears 12.

[0029] This device is further configured such as Figure 6 As shown, the rolling mechanism 7 includes a grinding frame 18, which has a trapezoidal structure. The grinding frame 18 is mounted on the bottom of the planetary gear 12 via an adjustable bracket, and a grinding groove 19 is provided at the bottom of the grinding frame 18.

[0030] The rolling mechanism 7 also includes a second grinding disc 22. The bottom of the grinding frame 18 is provided with a groove, and a rotating shaft is provided in the groove. Several second grinding discs 22 are rotatably mounted on the rotating shaft. A cover plate 21 is installed on one side of the grinding frame 18 by bolts.

[0031] The crushing mechanism 7 also includes grinding balls 17. An annular groove is provided at the bottom of the gear ring 11, and several grinding balls 17 are arranged inside the groove. A servo motor 8 drives the sun gear 10 to rotate, which in turn drives the planetary gear 12 and the first grinding disc 14 to rotate together. Coal powder slides outwards on the first grinding disc 14 due to centrifugal force. During this sliding process, the grinding frame 18 and the second grinding disc 22 crush the coal powder. The crushed coal powder flows out through the filter holes on the first grinding disc 14. Unqualified coal powder continues to be crushed. As the planetary gear 12 rotates, it carries the grinding frame 18 along with it. Centrifugal force causes the coal powder to be crushed multiple times into a suitable size during its outward movement. The appropriately sized coal powder is then filtered out through the filter holes. Simultaneously, the coal powder on the outer side undergoes final crushing by the grinding balls 17, improving the efficiency of the crushing and filtration process.

[0032] This device is further configured such as Figure 6 As shown, the filtration device also includes brush plates 20, which are installed on the left and right sides of the grinding frame 18. The brush plates 20 are used to clean the coal powder on the grinding disc 14, preventing the filter holes on the grinding disc 14 from becoming clogged.

[0033] This device is further configured such as Figure 4 As shown, the filtration device also includes a scraper 15, which is installed at the bottom of the grinding disc 14. The scraper 15 is driven to rotate by the rotation of the grinding disc 14, and the coal powder is swept to the discharge port 3.

[0034] Working principle: The servo motor 8 drives the sun gear 10 to rotate, which in turn drives the planetary gear 12 and the first grinding disc 14 to rotate together. The coal powder slides outward on the first grinding disc 14 due to centrifugal force. During the sliding process, the grinding frame 18 and the second grinding disc 22 crush the coal powder. The crushed coal powder flows out through the filter holes on the first grinding disc 14. The unqualified coal powder continues to be crushed. During the rotation of the planetary gear 12, the grinding frame 18 will rotate together. Through centrifugal force, the coal powder is crushed into a suitable size multiple times during the outward movement. The coal powder of the suitable size is filtered out through the filter holes. At the same time as the grinding frame 18 moves, the brush plate 20 cleans the coal powder on the first grinding disc 14. The scraper 15 at the bottom of the first grinding disc 14 sweeps the coal powder to the discharge port 3.

[0035] The above are merely preferred embodiments of this utility model. For parts that do not require creative effort in circuit control, signal control and transmission, please refer to the prior art. However, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and utility model concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A pulverized coal screening and filtering device for a steel ball coal mill, comprising a filtering device body (1), characterized in that, The bottom of the filter device body (1) is symmetrically provided with supporting legs (4), one side of the bottom of the filter device body (1) is provided with a discharge port (3), the top of the filter device body (1) is symmetrically provided with a feeding port (2), the inner side of the top of the filter device body (1) is provided with a conduit (5), the filter device body (1) is provided with a driving mechanism (6), the driving mechanism (6) is provided with a rolling mechanism (7) for grinding coal powder, the driving mechanism (6) comprises a servo motor (8) which is installed on the inner side of the top of the filter device body (1), the output end of the servo motor (8) is installed with a rotating shaft (9), the end of the rotating shaft (9) away from the servo motor (8) is installed with a sun gear (10), the outer wall of the sun gear (10) away from the rotating shaft (9) is installed with a grinding disc I (14) through a rod, the bottom inner side of the filter device body (1) is installed with a rotating seat (16), and the rotating seat (16) is rotatably installed with the grinding disc I (14).

2. A pulverized coal screening and filtering device for a steel ball coal mill according to claim 1, characterized in that, The outer wall of the grinding disc I (14) close to the sun gear (10) is provided with a convex structure for grinding, and the grinding disc I (14) is provided with a filter through hole for filtering coal powder.

3. A pulverized coal screening and filtering device for a steel ball coal mill according to claim 2, characterized in that, The driving mechanism (6) further comprises a gear ring (11) which is installed on the inner wall of the filter device body (1) through a mounting frame (13), a plurality of planetary gears (12) are installed in meshing between the sun gear (10) and the gear ring (11), and the rolling mechanism (7) is installed at the bottom of the planetary gear (12).

4. A pulverized coal screening and filtering device for a steel ball coal mill according to claim 3, characterized in that, The rolling mechanism (7) comprises a grinding frame (18), the grinding frame (18) is of trapezoidal structure, the grinding frame (18) is installed at the bottom of the planetary gear (12) through an adjustable support, and the bottom of the grinding frame (18) is provided with a grinding groove (19).

5. A pulverized coal screening and filtering device for a steel ball mill according to claim 4, characterized in that, The rolling mechanism (7) further comprises a grinding disc II (22), the bottom of the grinding frame (18) is provided with a groove, a rotating shaft is arranged in the groove, and a plurality of grinding disc II (22) are rotatably installed on the rotating shaft, and the side of the grinding frame (18) is installed with a cover plate (21) through bolts.

6. A pulverized coal screening and filtering device for a steel ball mill according to claim 5, characterized in that, The rolling mechanism (7) further comprises a grinding ball (17), the bottom of the gear ring (11) is provided with an annular groove, and a plurality of grinding balls (17) are arranged in the groove.

7. A pulverized coal screening and filtering device for a steel ball coal mill according to claim 6, characterized in that, The filter device further comprises a brush plate (20), and the brush plate (20) is installed on the left and right sides of the grinding frame (18).

8. A pulverized coal screening and filtering device for a steel ball mill coal pulverizer according to claim 7, characterized in that, The filter device further comprises a scraper (15), the scraper (15) is installed at the bottom of the grinding disc I (14), and the scraper (15) is driven to rotate by the rotation of the grinding disc I (14), so that the coal powder is swept to the discharge port (3).

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