A ball mill for grinding silicon carbide

Abstract

A ball mill for grinding silicon carbide, relating to the field of pulverizing equipment technology, includes a base, an outer cylinder fixedly mounted on the top of the base, an inner cylinder inside the outer cylinder, one end of the inner cylinder penetrating the outer cylinder and rotatably connected to it, a plurality of first and second liners fixedly mounted circumferentially on the inner wall of the inner cylinder, a plurality of fixed boxes fixedly mounted on the outer wall of the first liners, and a through box fixedly mounted on the outer wall of the second liners, both the fixed boxes and the through box penetrating outwards through the inner cylinder, a movable arc plate slidably mounted on the inner wall of the fixed boxes, a plurality of clearance grooves penetrating through the bottom of the first liners, a U-shaped plate moving synchronously with the movable arc plate on the outside of the fixed boxes, a plurality of adjusting arc plates fixedly mounted on the inner wall of the outer cylinder, the adjusting arc plates located within the U-shaped plates and in frictional contact with them, a plurality of discharge holes on the bottom of the second liners, and a discharge hopper fixedly mounted on the lower outer wall of the outer cylinder. This invention solves the problem of low grinding efficiency in existing ball mills.

Description

Technical Field

[0001] This invention relates to the field of pulverizing equipment technology, specifically a ball mill for grinding silicon carbide. Background Technology

[0002] Silicon carbide, an important inorganic non-metallic material, can be prepared industrially or naturally occurring in rare mineral forms. Industrially, it is commonly produced by high-temperature smelting in an electric resistance furnace using raw materials such as quartz sand, petroleum coke, and sawdust. Silicon carbide produced in my country is mainly divided into two categories: black silicon carbide and green silicon carbide. Both have a hexagonal crystal structure and possess high hardness, high wear resistance, and excellent thermal stability. To meet the specific requirements of different applications regarding particle size and surface morphology, silicon carbide is often processed into granules using a ball mill to fully utilize its performance advantages. Processed silicon carbide is widely used in abrasives, ceramic reinforcement, refractory materials, semiconductor substrates, and energy-saving coatings, playing an increasingly important role in modern industries such as aerospace, electronics, new energy, and special metallurgy.

[0003] The existing ball mills have gradually revealed their shortcomings during use, mainly in the following aspects:

[0004] The grinding efficiency is low. Specifically, in the grinding process of silicon carbide ore in a ball mill, large and small grinding balls have different functions. After being lifted to the release point, the large grinding balls fall automatically downwards, and the gravitational potential energy is converted into impact kinetic energy to crush the material. The small grinding balls fill the gaps and mainly grind the material through friction, compression and shearing. To ensure the overall grinding effect, the total filling rate of large and small grinding balls is usually controlled at about 35% of the internal space of the device, and the ratio of large to small grinding balls is set at about 2:3. It can be seen from this ratio that the number of large grinding balls is relatively high, which directly leads to the failure of small grinding balls to form a sufficiently dense grinding layer in the grinding system, thus affecting the grinding efficiency of the material.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a ball mill for grinding silicon carbide. In this ball mill, all grinding balls are small. Although these small grinding balls have a small mass, they gain initial velocity when falling downwards after being lifted to the release point. This initial velocity compensates for the loss of impact kinetic energy due to the reduced mass, thus ensuring that the overall impact crushing effect on the material remains constant. Furthermore, since all grinding balls are small, a sufficiently dense grinding layer can be formed in the grinding system, thereby significantly improving grinding efficiency.

[0007] To address the above problems, the present invention provides the following technical solution:

[0008] A ball mill for grinding silicon carbide includes a base, an outer cylinder fixedly mounted on the top of the base, an inner cylinder inside the outer cylinder, one end of the inner cylinder penetrating the outer cylinder and rotatably connected to it, a plurality of first and second liners fixedly mounted circumferentially on the inner wall of the inner cylinder, a plurality of fixed boxes fixedly mounted on the outer wall of the first liners, and a through box fixedly mounted on the outer wall of the second liners, both the fixed boxes and the through box penetrating outwards through the inner cylinder, a movable arc plate slidably mounted on the inner wall of the fixed boxes, a plurality of clearance grooves penetrating through the bottom of the first liners, a U-shaped plate moving synchronously with the movable arc plate on the outside of the fixed boxes, a plurality of adjusting arc plates fixedly mounted on the inner wall of the outer cylinder, the adjusting arc plates being located inside the U-shaped plates and in frictional contact with them, a plurality of discharge holes on the bottom of the second liners, a discharge hopper fixedly mounted on the lower outer wall of the outer cylinder, and a feeding assembly communicating with the inner cavity of the inner cylinder at the end of the outer cylinder.

[0009] As an optimized solution, a number of connecting rods are fixedly provided at the bottom of the movable arc plate. The connecting rods pass through the fixed box and are fixedly connected to the U-shaped plate. The connecting rods are slidably connected to the fixed box. A compression spring is fitted on the outer wall of the connecting rod. The two ends of the compression spring abut against the movable arc plate and the fixed box.

[0010] As an optimized solution, rollers are rotatably provided on both the side wall of the movable arc plate and the inner wall of the U-shaped plate.

[0011] As an optimized solution, the adjusting arc plate is divided into a variable diameter section, a constant diameter section and a notch section along the circumference. The radius of the variable diameter section increases in the counterclockwise direction, and the radius of the constant diameter section remains constant.

[0012] As an optimized solution, two bearing seats are fixedly provided on the top of the base, and a rotating shaft and a hollow shaft are fixedly provided at both ends of the inner cylinder. The rotating shaft is rotatably connected to one of the bearing seats, and the hollow shaft passes through the outer cylinder and is rotatably connected to the other bearing seat. The hollow shaft is rotatably connected to the outer cylinder.

[0013] As an optimized solution, the hollow shaft is connected to the inner cavity of the inner cylinder, the feeding assembly includes a feeding hopper that is detachably connected to the bearing seat, one end of the hollow shaft extends into the feeding hopper and is rotatably connected to it, and a feeding screw is fixedly provided on the inner wall of the hollow shaft.

[0014] As an optimized solution, a bracket is fixedly provided on the top of the base, a drive gear is rotatably provided on the top of the bracket, and a gear ring that meshes with the drive gear is fixedly fitted on the outer wall of the inner cylinder.

[0015] As an optimized solution, a drive motor is fixedly mounted on the top of the bracket, and the output shaft of the drive motor is fixedly connected to the drive gear.

[0016] As an optimized solution, a partition is fixedly provided on the inner wall of the inner cylinder, and the two ends of the first liner and the second liner abut against the partition and the inner cylinder respectively.

[0017] As an optimized solution, the outer cylinder is fixedly connected to the base via a support plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Add silicon carbide ore to the feed hopper. The drive motor rotates the inner cylinder. When the feed screw rotates, it transports the material in the feed hopper to the inside of the inner cylinder. When the inner cylinder rotates, it drives the first liner to rotate. When the U-shaped plate passes through the variable diameter section of the adjusting arc plate, the U-shaped plate drives the moving arc plate to slide closer to the fixed box. The compression spring is compressed. When the U-shaped plate enters the constant section of the adjusting arc plate, the moving arc plate enters the clearance groove and seals the clearance groove. When the U-shaped plate passes through the constant section of the adjusting arc plate, the relative position of the moving arc plate and the first liner remains unchanged. When the first liner passes through the lower area inside the inner cylinder, the grinding balls and material inside the inner cylinder enter the interior of the first liner. As the inner cylinder rotates, the first liner lifts the grinding balls and material inside it. The U-shaped plate leaves the constant section of the adjusting arc plate and enters the notch. During this period, the compression spring quickly returns to its original position, thereby pushing the moving arc plate to slide inward rapidly. This, in turn, quickly pushes the grinding balls and materials inside the first liner, giving them a relatively high initial velocity. The grinding balls and materials fall downward and collide with the materials below the inner cylinder for crushing. During the rotation of the inner cylinder, the materials below it tumble with the grinding balls. The grinding balls and materials are ground through friction, compression, and shearing. All the grinding balls in this ball mill are small grinding balls. Although the mass of the small grinding balls is small, they can gain an initial velocity when they fall downward after being lifted to the release point. This initial velocity compensates for the impact kinetic energy lost due to the reduction in mass, thus ensuring that the impact crushing effect on the materials remains unchanged. Furthermore, since all the grinding balls are small, a sufficiently dense grinding layer can be formed in the grinding system, thereby significantly improving the grinding efficiency.

[0020] 2. During the crushing and grinding process, qualified particles are discharged to the outer cylinder in a timely manner through the discharge hole on the second liner, and finally output through the discharge hopper. This achieves continuous and real-time material separation and discharge, effectively avoiding excessive retention and accumulation of qualified materials in the inner cylinder. This significantly reduces over-grinding caused by repeated crushing while improving the overall grinding efficiency.

[0021] 3. By using rollers, the friction between the U-shaped plate and the adjusting arc plate, as well as between the moving arc plate and the first liner, can be rolling friction, which significantly reduces the motion resistance between the contacting parts. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a side sectional view of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the inner cylinder of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the fixed box of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the first liner of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the adjustable arc plate of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the outer cylinder of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the second liner of the present invention;

[0031] Figure 9 This is a cross-sectional view of the second liner of the present invention;

[0032] Figure 10 This is a schematic diagram of the feeding assembly of the present invention.

[0033] In the diagram: 1-Base; 2-Rotating shaft; 3-Bearing seat; 4-Inner cylinder; 5-Outer cylinder; 6-Feeding assembly; 7-Support plate; 8-Discharge hopper; 9-Baffle plate; 10-Hollow shaft; 11-First liner; 12-Second liner; 13-Allowing groove; 14-U-shaped plate; 15-Connecting rod; 16-Fixed box; 17-Moving arc plate; 18-Roller; 19-Compression spring; 20-Constant section; 21-Variable diameter section; 22-Adjusting arc plate; 23-Notch section; 24-Feeding screw; 25-Feeding hopper; 26-Gear ring; 27-Drive motor; 28-Bracket; 29-Drive gear; 30-Through box; 31-Discharge hole. Detailed Implementation

[0034] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0035] like Figures 1 to 10 As shown, a ball mill for grinding silicon carbide includes a base 1, an outer cylinder 5 fixedly mounted on the top of the base 1, an inner cylinder 4 inside the outer cylinder 5, one end of the inner cylinder 4 penetrating through and rotatably connected to the outer cylinder 5, a plurality of first liners 11 and second liners 12 fixedly mounted circumferentially on the inner wall of the inner cylinder 4, a plurality of fixed housings 16 fixedly mounted on the outer wall of the first liners 11, and a through housing 30 fixedly mounted on the outer wall of the second liners 12, both the fixed housings 16 and the through housings 30 penetrating outward through the inner cylinder 4. The inner wall is provided with a movable arc plate 17. The bottom of the first liner plate 11 is provided with several clearance grooves 13. The outside of the fixed box 16 is provided with a U-shaped plate 14 that moves synchronously with the movable arc plate 17. The inner wall of the outer cylinder 5 is provided with several adjustable arc plates 22. The adjustable arc plates 22 are located inside the U-shaped plate 14 and are in frictional contact with it. The bottom of the second liner plate 12 is provided with several discharge holes 31. The lower outer wall of the outer cylinder 5 is provided with a discharge hopper 8. The end of the outer cylinder 5 is provided with a feeding assembly 6 that communicates with the inner cavity of the inner cylinder 4.

[0036] A number of connecting rods 15 are fixedly provided at the bottom of the movable arc plate 17. The connecting rods 15 pass through the fixed box 16 and are fixedly connected to the U-shaped plate 14. The connecting rods 15 are slidably connected to the fixed box 16. A compression spring 19 is fitted on the outer wall of the connecting rod 15. The two ends of the compression spring 19 abut against the movable arc plate 17 and the fixed box 16 respectively.

[0037] Rollers 18 are provided on the side wall of the movable arc plate 17 and the inner wall of the U-shaped plate 14.

[0038] The adjusting arc plate 22 is divided into a variable diameter section 21, a constant diameter section 20 and a notch section 23 along the circumference. The radius of the variable diameter section 21 increases in the counterclockwise direction, while the radius of the constant diameter section 20 remains constant.

[0039] Two bearing seats 3 are fixedly provided on the top of the base 1. A rotating shaft 2 and a hollow shaft 10 are fixedly provided at both ends of the inner cylinder 4. The rotating shaft 2 is rotatably connected to one of the bearing seats 3. The hollow shaft 10 passes through the outer cylinder 5 and is rotatably connected to the other bearing seat 3. The hollow shaft 10 is rotatably connected to the outer cylinder 5.

[0040] The hollow shaft 10 is connected to the inner cavity of the inner cylinder 4. The feeding assembly 6 includes a feeding hopper 25 that is detachably connected to the bearing seat 3. One end of the hollow shaft 10 extends into the feeding hopper 25 and is rotatably connected to it. The inner wall of the hollow shaft 10 is fixedly provided with a feeding screw 24.

[0041] A bracket 28 is fixedly installed on the top of the base 1, and a drive gear 29 is rotatably installed on the top of the bracket 28. A gear ring 26 that meshes with the drive gear 29 is fixedly fitted on the outer wall of the inner cylinder 4.

[0042] A drive motor 27 is fixedly mounted on the top of the bracket 28, and the output shaft of the drive motor 27 is fixedly connected to the drive gear 29.

[0043] A partition 9 is fixedly provided on the inner wall of the inner cylinder 4, and the two ends of the first liner 11 and the second liner 12 abut against the partition 9 and the inner cylinder 4 respectively.

[0044] The outer cylinder 5 is fixedly connected to the base 1 via the support plate 7.

[0045] The working principle of this device is as follows:

[0046] Silicon carbide ore is added to the feed hopper 25. The drive motor 27 drives the inner cylinder 4 to rotate. When the feed screw 24 rotates, it transports the material in the feed hopper 25 into the inner cylinder 4. When the inner cylinder 4 rotates, it drives the first liner 11 to rotate. When the U-shaped plate 14 passes through the variable diameter section 21 of the adjusting arc plate 22, the U-shaped plate 14 drives the moving arc plate 17 to slide closer to the fixed box 16. The compression spring 19 is compressed, and the U-shaped plate 14 enters the constant diameter section of the adjusting arc plate 22. When the fixed section 20 is reached, the movable arc plate 17 enters the clearance groove 13 and blocks the clearance groove 13. When the U-shaped plate 14 passes through the constant section 20 of the adjusting arc plate 22, the relative position of the movable arc plate 17 and the first liner 11 remains unchanged. When the first liner 11 passes through the lower area inside the inner cylinder 4, the grinding balls and materials inside the inner cylinder 4 enter the first liner 11. As the inner cylinder 4 rotates, the first liner 11 lifts the grinding balls and materials inside it. When the U-shaped plate 14 is lifted and disengaged from the constant section 20 of the adjusting arc plate 22 and enters the notch section 23, the compression spring 19 quickly returns to its original position, thereby pushing the moving arc plate 17 to slide inward quickly, which in turn quickly pushes the grinding balls and materials in the first liner 11, giving them a relatively high initial velocity. The grinding balls and materials fall downward and collide with the materials below the inner cylinder 4 for crushing. During the rotation of the inner cylinder 4, the materials below it tumble with the grinding balls. The grinding balls and materials are ground through friction, compression and shearing. All the grinding balls in this ball mill are small grinding balls. Although the mass of the small grinding balls is small, they can obtain an initial velocity when they fall downward after being lifted to the disengagement point. The initial velocity makes up for the impact kinetic energy lost due to the reduction in mass, thus ensuring that the impact crushing effect on the materials remains unchanged. In addition, since all the grinding balls are small grinding balls, a sufficiently dense grinding layer can be formed in the grinding system, thereby greatly improving the grinding efficiency.

[0047] During the crushing and grinding process, qualified particles are discharged to the outer cylinder 5 in a timely manner through the discharge hole 31 on the second liner 12, and finally output through the discharge hopper 8, realizing continuous and real-time material separation and discharge, effectively avoiding excessive retention and accumulation of qualified materials in the inner cylinder 4, thereby improving the overall grinding efficiency and significantly reducing the over-grinding phenomenon caused by repeated crushing.

[0048] By using the rollers 18, the friction between the U-shaped plate 14 and the adjusting arc plate 22, as well as between the moving arc plate 17 and the first liner 11, can be rolling friction, which significantly reduces the motion resistance between the contacting parts.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A ball mill for grinding silicon carbide, characterized in that: The base (1) includes an outer cylinder (5) fixedly mounted on its top. An inner cylinder (4) is provided inside the outer cylinder (5). One end of the inner cylinder (4) passes through the outer cylinder (5) and is rotatably connected to it. Several first liner plates (11) and second liner plates (12) are fixedly mounted circumferentially on the inner wall of the inner cylinder (4). Several fixed boxes (16) are fixedly mounted on the outer wall of the first liner plates (11). A through box (30) is fixedly mounted on the outer wall of the second liner plates (12). Both the fixed boxes (16) and the through box (30) extend outward through the inner cylinder (4). The inner wall of the fixed boxes (16) is slidably provided with... The movable arc plate (17) has several clearance grooves (13) through the bottom of the first liner (11). The fixed box (16) has a U-shaped plate (14) that moves synchronously with the movable arc plate (17) on the outside. Several adjusting arc plates (22) are fixedly provided on the inner wall of the outer cylinder (5). The adjusting arc plates (22) are located inside the U-shaped plate (14) and are in frictional contact with it. Several discharge holes (31) are provided at the bottom of the second liner (12). A discharge hopper (8) is fixedly provided on the lower outer wall of the outer cylinder (5). A feeding assembly (6) that communicates with the inner cavity of the inner cylinder (4) is provided at the end of the outer cylinder (5). The adjusting arc plate (22) is divided into a variable diameter section (21), a constant section (20) and a notch section (23) along the circumference. The radius of the variable diameter section (21) increases in the counterclockwise direction, and the radius of the constant section (20) remains constant.

2. The ball mill for silicon carbide grinding according to claim 1, characterized in that: The bottom of the movable arc plate (17) is fixedly provided with several connecting rods (15). The connecting rods (15) pass through the fixed box (16) and are fixedly connected to the U-shaped plate (14). The connecting rods (15) are slidably connected to the fixed box (16). The outer wall of the connecting rods (15) is fitted with compression springs (19). The two ends of the compression springs (19) abut against the movable arc plate (17) and the fixed box (16).

3. A ball mill for grinding silicon carbide according to claim 2, characterized in that: Rollers (18) are rotatably provided on the side wall of the movable arc plate (17) and the inner wall of the U-shaped plate (14).

4. A ball mill for grinding silicon carbide according to claim 1, characterized in that: The base (1) is fixedly provided with two bearing seats (3) at the top. The inner cylinder (4) is fixedly provided with a rotating shaft (2) and a hollow shaft (10) at both ends. The rotating shaft (2) is rotatably connected to one of the bearing seats (3). The hollow shaft (10) passes through the outer cylinder (5) and is rotatably connected to the other bearing seat (3). The hollow shaft (10) is rotatably connected to the outer cylinder (5).

5. A ball mill for grinding silicon carbide according to claim 4, characterized in that: The hollow shaft (10) is connected to the inner cavity of the inner cylinder (4). The feeding assembly (6) includes a feeding hopper (25) that is detachably connected to the bearing seat (3). One end of the hollow shaft (10) extends into the feeding hopper (25) and is rotatably connected to it. The inner wall of the hollow shaft (10) is fixedly provided with a feeding screw (24).

6. A ball mill for grinding silicon carbide according to claim 4, characterized in that: The base (1) is fixedly provided with a bracket (28) at the top, and a drive gear (29) is rotatably provided at the top of the bracket (28). The outer wall of the inner cylinder (4) is fixedly fitted with a gear ring (26) that meshes with the drive gear (29).

7. A ball mill for grinding silicon carbide according to claim 6, characterized in that: The top of the bracket (28) is fixedly equipped with a drive motor (27), and the output shaft of the drive motor (27) is fixedly connected to the drive gear (29).

8. A ball mill for grinding silicon carbide according to claim 1, characterized in that: The inner wall of the inner cylinder (4) is fixedly provided with a partition (9), and the two ends of the first liner (11) and the second liner (12) abut against the partition (9) and the inner cylinder (4).

9. A ball mill for grinding silicon carbide according to claim 1, characterized in that: The outer cylinder (5) is fixedly connected to the base (1) through the support plate 7.

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