Low-resistance efficient powder concentrator for coal milling system

Abstract

The invention relates to the technical field of powder concentrators, and provides a low-resistance efficient powder concentrator for a coal milling system, which comprises a shell, a through groove I and a through groove II are formed in the top of the shell, a fine powder air outlet and a coarse powder air outlet are respectively formed in the through groove I and the through groove II, a feeding hole is formed in the other side of the shell, and a main shaft is arranged in the middle of the shell; the main shaft is fixedly connected with a guide blade, the main shaft is fixedly connected with a cage type rotor at the top of the guide blade, an automatic adjusting assembly is arranged between the guide blade and the cage type rotor, and the main shaft is fixedly connected with a vortex adjusting blade at the top of the cage type rotor; the speed of the main shaft, the position of the sliding block and the height of the telescopic cylinder are automatically adjusted according to changes of the material amount, radial expansion or contraction of the cage type rotor is achieved, overload sorting force is effectively reduced, the sorting efficiency is kept stable, the adaptability and flexibility of the powder concentrator are improved through self-adaptive adjustment, full utilization of materials is guaranteed, and the service life of the powder concentrator is prolonged. The waste is reduced, and the production benefit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of powder separators, and more particularly to a low-resistance and high-efficiency powder separator for a coal grinding system. Background Art

[0002] In the modern cement production industry, as one of the key equipment, the powder separator plays a crucial role in coal grinding, intermediate discharge drying mills for raw materials, and cement grinding systems. The performance of the powder separator directly affects the efficiency, product quality, and energy consumption level of the cement production line. With the continuous progress of technology and the increasing requirements for high efficiency, energy conservation, and environmental protection in the cement industry, the design and application of powder separators are constantly optimized and innovated.

[0003] According to its working principle and structural characteristics, powder separators can be roughly divided into three categories: three-separation powder separators, centrifugal powder separators, and cyclone powder separators. Among them, the centrifugal powder separator has been widely used in cement production lines due to its unique separation principle and high separation efficiency. The working principle of the centrifugal powder separator is to use air as the medium to divide the fed material into two streams: one stream contains fine particles, and the other stream contains as many coarse particles as possible. This separation method not only improves the utilization rate of the material but also effectively controls the particle size distribution of the product.

[0004] However, in the actual production process, the powder fed each time varies in properties, particle size composition, etc., which results in different resistances borne by the main shaft during each rotation, often causing significant fluctuations in the separation efficiency and a decrease in the classification accuracy. The reduction in separation efficiency means that a considerable part of the fine particles cannot be effectively separated but enter the subsequent processing links together with the coarse particles. This phenomenon not only seriously affects the uniformity and consistency of the product particle size but also may increase the operating burden of the subsequent equipment, reduce the overall efficiency and production capacity of the entire production line, and have an adverse impact on the production efficiency and product quality control of cement enterprises. Therefore, it is particularly important to carry out technical improvements and optimizations for the problems existing in the actual application of powder separators. Summary of the Invention

[0005] The present invention provides a low-resistance and high-efficiency powder separator for a coal grinding system. By automatically adjusting the positions of the fine powder outlet and the coarse powder outlet, it can intelligently adapt to different load conditions, reducing the labor intensity of operators. At the same time, this design can automatically adjust the working parameters when dealing with a large amount of or high-density materials to ensure that the separation efficiency is not affected, significantly improving the production efficiency and the intelligent level of the powder separator, so as to solve the problems raised in the background art.

[0006] The technical solution of the present invention is as follows:

[0007] A low-resistance and high-efficiency powder separator for a coal grinding system, comprising: a housing, a through groove one is opened at the top of the housing, a fine powder air outlet is arranged in the through groove one, a through groove two is opened on one side of the housing, a feed inlet is opened on the other side of the housing, a coarse powder air outlet is arranged in the through groove two, square grooves one are opened on both sides of the through groove two, and the square grooves one provide space for the sliding of the slide plates, ensuring the adjustability of the position of the coarse powder air outlet. A main shaft is arranged in the middle of the housing, a guiding vane is fixedly connected to the main shaft, a cage rotor is fixedly connected to the main shaft at the top of the guiding vane, an automatic adjustment component is arranged between the guiding vane and the cage rotor, and a vortex adjustment vane is fixedly connected to the main shaft at the top of the cage rotor;

[0008] The automatic adjustment component includes a limiting rod two fixedly connected to the main shaft, the limiting rod two is between the cage rotor and the guiding vane, a limiting through groove is opened on the limiting rod two, a winding component is fixedly connected to one end of the limiting through groove close to the cage rotor, a slider is slidably connected to one side of the winding component in the limiting through groove, an arc-shaped rack is fixedly connected to the top of the slider, and tooth grooves are arranged on both sides of the arc-shaped rack.

[0009] Further, one end of the fine powder air outlet extending into the through groove one is provided with a telescopic cylinder, the end of the telescopic cylinder away from the fine powder air outlet is in a horn shape, which can effectively concentrate the air flow, and a limiting block one is fixedly connected to the edge of the end of the telescopic cylinder in the horn shape.

[0010] Further, slide plates are fixedly connected to the top and bottom of the coarse powder air outlet, and the two slide plates are respectively slidably connected in the square groove one and the through groove two. One end of the limiting block one away from the telescopic cylinder is fixedly connected to the slide plate above the coarse powder air outlet, a limiting block two is fixedly connected to the inner side of the slide plate below the coarse powder air outlet, a circular groove is opened at the bottom of the slide plate, and a threaded groove is opened on the inner wall of the slide plate at the bottom of the circular groove.

[0011] Further, the cage rotor includes a fixed ring fixedly connected to the main shaft, a plurality of fixed rods are fixedly connected to the fixed ring, the fixed rods are equally divided on the fixed ring, a chute one is opened in each fixed rod, a limiting rod one is slidably connected in the chute one, and a limiting ring is arranged at the top of the limiting rod one.

[0012] Further, a chute two is opened at the bottom of the limiting ring, the chute two is composed of a circular ring groove and a plurality of square grooves equal in number to the limiting rod one, one end of the limiting rod one away from the fixed rod is slidably connected in the chute two, a limiting groove is opened on the outer side of the limiting ring, and the limiting block two is slidably connected in the limiting groove.

[0013] Further, the winding component includes a second limiting plate fixedly connected to the top of the limiting through groove. A fixed shaft is fixedly connected to the bottom of the second limiting plate. A first groove is formed in the fixed shaft. A cylinder is rotatably connected to the outside of the fixed shaft at the bottom of the second limiting plate. A second groove is formed in the cylinder. A coil spring is arranged on the cylinder. Two ends of the coil spring are respectively fixedly connected in the first groove and the second groove. A pulling rope is arranged on the cylinder. The pulling rope is wound around the cylinder. One end of the pulling rope is fixedly connected to the slider.

[0014] Further, a first limiting plate is fixedly connected between the second limiting rod and the first square groove located below on the inner wall of the housing. A first gear is rotatably connected to the bottom of the first limiting plate. A second gear and a third gear are sequentially arranged on one side of the first gear. The lengths of the second gear and the third gear are half of that of the first gear. The first gear and the second gear are meshed with each other. The second gear and the third gear are meshed with each other. The second gear is rotatably connected to the first limiting plate. The third gear is rotatably connected in the first square groove. The arc-shaped rack can be meshed with the first gear and the third gear.

[0015] Further, threaded rods are fixedly connected to one side of the third gear. Smooth rods are arranged at both ends of the threaded rod. The threaded rod is rotatably connected in the circular groove and contacts with the threaded groove. The arc-shaped racks on both sides of the top of the slider are respectively meshed with the first gear and the third gear.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By automatically adjusting the main shaft speed, the position of the slider and the height of the telescopic cylinder according to the change of the material quantity, the present invention realizes the radial expansion or contraction of the cage rotor, effectively reduces the overload sorting force, keeps the sorting efficiency stable. This kind of adaptive adjustment not only improves the adaptability and flexibility of the powder separator, but also ensures the full utilization of materials, reduces waste and improves the production efficiency.

[0018] 2. By automatically adjusting the positions of the fine powder air outlet and the coarse powder air outlet, the present invention intelligently adapts to different load conditions, reduces the labor intensity of the operators. At the same time, when dealing with a large amount of materials or materials with higher density, the design can automatically adjust the working parameters to ensure that the sorting efficiency is not affected, and significantly improves the production efficiency and the intelligent level of the powder separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional view of the device of the present invention;

[0020] Figure 2 is a sectional view of the device of the present invention;

[0021] Figure 3 is the internal structure diagram of the device of the present invention;

[0022] Figure 4 is the structure diagram of the second chute of the device of the present invention;

[0023] Figure 5 is the structure diagram of the automatic adjustment component of the device of the present invention;

[0024] Figure 6 is the structure diagram of the first limiting rod of the device of the present invention;

[0025] Figure 7 is the structure diagram of the winding component of the device of the present invention;

[0026] Figure 8 is the present invention Figure 3 The enlarged view at position A in;

[0027] Figure 9 is the present invention Figure 4 The enlarged view at position B in;

[0028] Figure 10 is the present invention Figure 5 The enlarged view at position C in.

[0029] In the figure:

[0030] 1. Housing; 11. First through groove; 12. Fine powder air outlet; 121. Telescopic cylinder; 122. First limiting block; 13. Second through groove; 14. Coarse powder air outlet; 15. First square groove; 151. Slide plate; 1511. Second limiting block; 152. Circular groove; 153. Threaded groove; 16. Feed inlet; 2. Main shaft; 3. Guide vane; 4. Cage rotor; 41. Fixed ring; 42. Fixed rod; 43. First chute; 44. First limiting rod; 45. Limiting ring; 451. Second chute; 452. Limiting groove; 5. Automatic adjustment component; 51. Second limiting rod; 52. Limiting through groove; 53. Winding component; 531. Second limiting plate; 532. Fixed shaft; 533. First groove; 534. Cylinder; 535. Second groove; 536. Torsion spring; 537. Pulling rope; 54. Slide block; 55. Arc-shaped rack; 551. First limiting plate; 552. First gear; 553. Second gear; 554. Third gear; 5541. Threaded rod; 5542. Smooth rod; 6. Eddy current adjustment vane. Detailed implementation manners

[0031] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0032] Such as Figures 1 - 10As shown in the figure, the present invention provides a low-resistance and high-efficiency powder separator for a coal grinding system, including: a housing 1, a through groove 11 is opened at the top of the housing 1, a fine powder air outlet 12 is arranged in the through groove 11, a through groove 13 is opened on one side of the housing 1, a feed inlet 16 is opened on the other side of the housing 1, a coarse powder air outlet 14 is arranged in the through groove 13, square grooves 15 are opened on both sides of the through groove 13, and the square grooves 15 provide space for the sliding of the sliding plates 151, ensuring the adjustability of the position of the coarse powder air outlet 14. A main shaft 2 is arranged in the middle of the housing 1, a guiding vane 3 is fixedly connected to the main shaft 2, a cage rotor 4 is fixedly connected to the main shaft 2 at the top of the guiding vane 3, an automatic adjustment component 5 is arranged between the guiding vane 3 and the cage rotor 4, and a vortex adjustment vane 6 is fixedly connected to the main shaft 2 at the top of the cage rotor 4;

[0033] The automatic adjustment component 5 includes a limiting rod two 51 fixedly connected to the main shaft 2, the limiting rod two 51 is between the cage rotor 4 and the guiding vane 3, a limiting through groove 52 is opened on the limiting rod two 51, a winding component 53 is fixedly connected to one end of the limiting through groove 52 close to the cage rotor 4, a slider 54 is slidably connected to one side of the winding component 53 in the limiting through groove 52, an arc-shaped rack 55 is fixedly connected to the top of the slider 54, and tooth grooves are arranged on both sides of the arc-shaped rack 55.

[0034] As a technical solution of the present invention, one end of the fine powder air outlet 12 extending into the through groove 11 is provided with a telescopic cylinder 121, one end of the telescopic cylinder 121 away from the fine powder air outlet 12 is in a horn shape, and a limiting block one 122 is fixedly connected to the edge of the telescopic cylinder 121 in the horn shape.

[0035] As a technical solution of the present invention, sliding plates 151 are fixedly connected to the top and bottom of the coarse powder air outlet 14, and the two sliding plates 151 are respectively slidably connected in the square groove 15 and the through groove 13. One end of the limiting block one 122 away from the telescopic cylinder 121 is fixedly connected to the sliding plate 151 above the coarse powder air outlet 14, a limiting block two 1511 is fixedly connected to the inner side of the sliding plate 151 below the coarse powder air outlet 14, a circular groove 152 is opened at the bottom of the sliding plate 151, and a threaded groove 153 is opened on the inner wall of the sliding plate 151, and the threaded groove 153 is opened at the bottom of the circular groove 152.

[0036] As a technical solution of the present invention, the cage rotor 4 includes a fixing ring 41 fixedly connected to the main shaft 2. A plurality of fixing rods 42 are fixedly connected to the fixing ring 41. The fixing rods 42 are equally divided on the fixing ring 41. A first chute 43 is formed in each fixing rod 42. A first limiting rod 44 is slidably connected in the first chute 43. A limiting ring 45 is arranged at the top of the first limiting rod 44.

[0037] As a technical solution of the present invention, a second chute 451 is formed at the bottom of the limiting ring 45. The second chute 451 is composed of a circular ring groove and a plurality of square grooves equal in number to the first limiting rods 44. When the first limiting rod 44 moves downward or upward, the bottom end of the first limiting rod 44 slides in the first chute 43, and the top end of the first limiting rod 44 slides in the second chute 451, facilitating the first limiting rod 44 to adapt to the spacing of the fixing rods 42. One end of the first limiting rod 44 away from the fixing rod 42 is slidably connected in the second chute 451. A limiting groove 452 is formed on the outer side of the limiting ring 45. The second limiting block 1511 is slidably connected in the limiting groove 452.

[0038] As a technical solution of the present invention, the winding assembly 53 includes a second limiting plate 531 fixedly connected to the top of the limiting through groove 52. A fixing shaft 532 is fixedly connected to the bottom of the second limiting plate 531. A first groove 533 is formed on the fixing shaft 532. A cylinder 534 is rotatably connected to the bottom of the second limiting plate 531 outside the fixing shaft 532. A second groove 535 is formed on the cylinder 534. A torsion spring 536 is arranged on the cylinder 534. Two ends of the torsion spring 536 are respectively fixedly connected in the first groove 533 and the second groove 535. A pull rope 537 is arranged on the cylinder 534. The pull rope 537 is wound around the cylinder 534. One end of the pull rope 537 is fixedly connected to the slider 54.

[0039] As a technical solution of the present invention, a first limiting plate 551 is fixedly connected between the second limiting rod 51 and the first square groove 15 below on the inner wall of the housing 1. A first gear 552 is rotatably connected to the bottom of the first limiting plate 551. A second gear 553 and a third gear 554 are sequentially arranged on one side of the first gear 552. The lengths of the second gear 553 and the third gear 554 are half of that of the first gear 552. The first gear 552 meshes with the second gear 553. The second gear 553 meshes with the third gear 554. The second gear 553 is rotatably connected to the first limiting plate 551. The third gear 554 is rotatably connected in the first square groove 15. The arc-shaped rack 55 can mesh with the first gear 552 and the third gear 554.

[0040] As a technical solution of the present invention, threaded rods 5541 are fixedly connected to one side of each of the third gears 554. Smooth rods 5542 are arranged at both ends of each threaded rod 5541. The threaded rod 5541 is rotatably connected in the circular groove 152 and contacts the threaded groove 153. On both sides of the top of the slider 54, the arc-shaped racks 55 are respectively meshed with the first gear 552 and the third gear 554. The slider 54 slides in the limit through groove 52. Through the meshing of the arc-shaped racks 55 with the first gear 552 and the third gear 554 respectively, mechanical transmission is realized, making the adjustment process more accurate and reliable.

[0041] Working principle:

[0042] As Figures 2 - 10 shown, the material to be sorted enters the classifier housing 1 through the feed inlet 16, forms a spiral material flow under the guidance of the guide vanes 3. The main shaft 2 drives the cage rotor 4 to rotate at a high speed, generating a centrifugal force field. Fine particles, due to the air resistance they receive being greater than the centrifugal force, enter the fine powder outlet 12 through the telescopic cylinder 121 along with the upward airflow; the coarse particles are thrown towards the inner wall of the housing 1 under the action of the centrifugal force and are discharged through the coarse powder outlet 14; when there is less powder in the housing 1, the resistance received by the rotation of the main shaft 2 is smaller, and the speed of the main shaft 2 will increase accordingly. At this time, the torque of the main shaft 2 increases, the centrifugal force increases, pushing the slider 54 to slide on the limit through groove 52 towards the direction of the third gear 554. The slider 54 pulls the pull rope 537, and the pull rope 537 drives the cylinder 534 to rotate, thereby compressing the coil spring 536 and storing energy; when the slider 54 drives the arc-shaped rack 55 to be meshed with the third gear 554, the arc-shaped rack 55 drives the third gear 554 to rotate clockwise during the rotation following the main shaft 2. The third gear 554 drives the threaded rod 5541 to rotate. During the rotation of the threaded rod 5541, the threaded rod 5541 drives the slide plate 151 to slide upward through the threaded groove 153. Since the two slide plates 151 are fixedly connected through the coarse powder outlet 14, and the first limiting block 122 is fixedly connected to the upper slide plate 151, when the threaded rod 5541 drives the slide plate 151 to move upward in the square groove 15, it drives the telescopic cylinder 121 to move synchronously. Also, because the second limiting block 1511 is slidably connected in the limiting groove 452, when the second limiting block 1511 follows the movement of the slide plate 151, it pulls the limiting ring 45 to move synchronously. The limiting ring 45 pulls the bottom end of the first limiting rod 44 to slide upward in the first chute 43, and at the same time, the top end of the first limiting rod 44 moves towards the housing 1 direction in the second chute 451, realizing the radial expansion of the cage rotor 4, reducing the local centrifugal force density, offsetting the overload sorting force, and ensuring the stability of the sorting efficiency; and by adjusting the positions of the fine powder outlet 12 and the coarse powder outlet 14, it can be automatically adjusted according to the change of the material quantity, thereby maintaining the stability of the sorting efficiency.

[0043] As Figures 2 - 8 and Figure 10As shown, if the powder separator is processing a large amount or high-density materials, then during the rotation of the main shaft 2, it needs to overcome greater resistance, so that the speed of the main shaft 2 also decreases due to the increase in load. At this time, the slider 54 loses the restriction of centrifugal force, and at the same time the coil spring 536 loses the restriction, driving the cylinder 534 to rotate, and pulling back the pull rope 537, and then pulling the slider 54 to move in the direction of the first gear 552, so that the teeth on the side of the arc-shaped rack 55 away from the third gear 554 mesh with the first gear 552, driving the first gear 552 to rotate counterclockwise. The first gear 552 drives the second gear 553 to rotate clockwise, the second gear 553 drives the third gear 554 to rotate counterclockwise, and the third gear 554 drives the threaded rod 5541 connected thereto to rotate. The rotation of the threaded rod 5541 drives the slide plate 151 to move downward, and then drives the telescopic cylinder 121 and the coarse powder air outlet 14 to move downward synchronously. The present invention has the ability to intelligently adapt to load changes. When processing a large amount or high-density materials, it can automatically adjust the speed of the main shaft 2, the position of the slider 54 and the height of the telescopic cylinder 121 to adapt to different working conditions, and ensure the full utilization of materials and reduce the generation of waste. This automatic adjustment function not only improves the adaptability and flexibility of the powder separator, but also reduces the labor intensity of the operator and improves the production efficiency.

[0044] The embodiments of the present invention are given for purposes of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A low-resistance and high-efficiency powder classifier for a coal mill system, comprising: A shell (1), characterized in that: a through slot (11) is provided at the top of the shell (1), a fine powder outlet (12) is provided in the through slot (11), a through slot (2) is provided on one side of the shell (1), a feed port (16) is provided on the other side of the shell (1), a coarse powder outlet (14) is provided in the through slot (2) (13), square slots (15) are provided on both sides of the through slot (2) (13), a main shaft (2) is provided in the middle of the shell (1), a guide blade (3) is fixedly connected to the main shaft (2), a cage rotor (4) is fixedly connected to the top of the guide blade (3), an automatic adjustment component (5) is provided between the guide blade (3) and the cage rotor (4), and a vortex adjustment blade (6) is fixedly connected to the main shaft (2) at the top of the cage rotor (4); The automatic adjustment component (5) comprises a second limiting rod (51) fixedly connected to the main shaft (2), the second limiting rod (51) being between the cage rotor (4) and the guide blade (3), the second limiting rod (51) being provided with a limiting through slot (52), a winding component (53) being fixedly connected to one end of the limiting through slot (52) close to the cage rotor (4), a sliding block (54) being slidably connected to one side of the winding component (53) in the limiting through slot (52), an arc-shaped rack (55) being fixedly connected to the top of the sliding block (54), and latching teeth being provided on both sides of the arc-shaped rack (55).

2. A low-resistance and high-efficiency powder separator for a coal mill system as claimed in claim 1, characterized in that: A telescopic cylinder (121) is provided at one end of the fine powder outlet (12) extending into the through groove (11); the end of the telescopic cylinder (121) away from the fine powder outlet (12) is horn-shaped, and the edge of the horn-shaped end of the telescopic cylinder (121) is fixedly connected to a limiting block (122).

3. A low-resistance and high-efficiency powder separator for a coal mill system as claimed in claim 2, characterized in that: The top and bottom of the coarse powder air outlet (14) are both fixedly connected with a slide plate (151), and the two slide plates (151) are slidably connected to the square groove 1 (15) and the through groove 2 (13) respectively; the end of the limit block 1 (122) away from the telescopic cylinder (121) is fixedly connected to the slide plate (151) above the coarse powder air outlet (14); the inner side of the slide plate (151) below the coarse powder air outlet (14) is fixedly connected to the limit block 2 (1511); a circular groove (152) is provided at the bottom of the slide plate (151); a threaded groove (153) is provided on the inner wall of the slide plate (151); and the threaded groove (153) is provided at the bottom of the circular groove (152).

4. A low-resistance and high-efficiency powder concentrator for a coal mill system as claimed in claim 3, characterized in that: The cage-type rotor (4) comprises a fixing ring (41) fixedly connected to the main shaft (2), a plurality of fixing rods (42) fixedly connected to the fixing ring (41), the fixing rods (42) being equally arranged on the fixing ring (41), each fixing rod (42) being provided with a slide groove (43), a limiting rod (44) being slidably connected in the slide groove (43), and a limiting ring (45) being provided at the top of the limiting rod (44).

5. A low-resistance and high-efficiency powder concentrator for a coal mill system as claimed in claim 4, characterized in that: A second slide groove (451) is provided at the bottom of the limiting ring (45), and the second slide groove (451) is composed of a circular groove and a plurality of square grooves equal to the number of the limiting rod (44). One end of the limiting rod (44) away from the fixing rod (42) is slidably connected in the second slide groove (451), and a limiting groove (452) is provided on the outer side of the limiting ring (45), and the second limiting block (1511) is slidably connected in the limiting groove (452).

6. A low-resistance and high-efficiency powder concentrator for a coal mill system as claimed in claim 3, characterized in that: The winding assembly (53) comprises a second limiting plate (531) fixedly connected to the top of the limiting slot (52); the bottom of the second limiting plate (531) is fixedly connected to a fixed shaft (532); a groove one (533) is provided on the fixed shaft (532); the bottom of the second limiting plate (531) is rotatably connected to a cylinder (534) on the outer side of the fixed shaft (532); a groove two (535) is provided on the cylinder (534); a coil spring (536) is provided on the cylinder (534); two ends of the coil spring (536) are respectively fixedly connected to the groove one (533) and the groove two (535); a pull rope (537) is provided on the cylinder (534); the pull rope (537) is wound around the cylinder (534); one end of the pull rope (537) is fixedly connected to the slider (54).

7. A low-resistance and high-efficiency powder concentrator for a coal mill system as claimed in claim 6, characterized in that: A limiting plate 1 (551) is fixedly connected between the limiting rod 2 (51) and the square groove 1 (15) located below on the inner wall of the housing (1); the bottom of the limiting plate 1 (551) is rotatably connected to a gear 1 (552); one side of the gear 1 (552) is provided with a gear 2 (553) and a gear 3 (554) in sequence; the lengths of the gear 2 (553) and the gear 3 (554) are half of the length of the gear 1 (552); the gear 1 (552) and the gear 2 (553) are meshed with each other; the gear 2 (553) and the gear 3 (554) are meshed with each other; the gear 2 (553) is rotatably connected to the limiting plate 1 (551); the gear 3 (554) is rotatably connected in the square groove 1 (15); and the arc-shaped rack (55) can be meshed with the gear 1 (552) and the gear 3 (554).

8. A low-resistance and high-efficiency powder concentrator for a coal mill system as claimed in claim 7, characterized in that: A threaded rod (5541) is fixedly connected to one side of the gear three (554), and smooth rods (5542) are provided at both ends of the threaded rod (5541). The threaded rod (5541) is rotatably connected in the circular groove (152) and contacts the threaded groove (153). The arc-shaped racks (55) on both sides of the top of the slider (54) are respectively meshed with the gear one (552) and the gear three (554).

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