A multi-stage grinding apparatus for silicon carbide micro-powder production and a method of using the same

Abstract

The application discloses a kind of multistage grinding equipment for silicon carbide micro powder production and its use method, applied to silicon carbide micro powder production field, including grinding assembly, the grinding assembly includes propeller one, ring groove is opened in the front end shaft of propeller one, two groups of shaft shoulders are opened in the rear end shaft of propeller one, bearing is sleeved on the shaft between two groups of shaft shoulders, the outer ring of bearing is fixedly installed with bearing seat one, the outer side shaft of two ends of shaft shoulder is sleeved with moving ring, the front end shaft of propeller one is connected with bearing seat two with bearing, the outer ring of bearing seat two is fixedly installed with support disc, the front end of support disc is fixedly installed with connecting rod, the other end of connecting rod is fixedly connected with disc, round hole is opened in the front end of disc, two groups of hydraulic cylinders are symmetrically installed in the front end of disc, the output end of each group of hydraulic cylinder is fixedly connected with chuck, the present application has the characteristics of multistage grinding and crushing aggregate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silicon carbide powder production, in particular to a multi-stage grinding equipment for silicon carbide powder production and a use method thereof. BACKGROUND

[0002] Silicon carbide is a compound composed of silicon and carbon elements, which has excellent properties such as extremely high hardness, high temperature resistance, corrosion resistance, and good thermal conductivity. Silicon carbide powder generally refers to silicon carbide powder with a particle size in the micron or sub-micron level, which is commonly used in high-precision fields such as semiconductors and precision ceramics.

[0003] Silicon carbide raw particles are usually millimeter-sized and cannot be directly used in high-precision scenarios. Therefore, it is necessary to grind the silicon carbide raw particles to the required particle size to realize their high-performance potential and meet the needs of high-end fields such as semiconductors, photovoltaics, and ceramics. In order to reduce energy loss and improve grinding accuracy, multi-stage grinding is often used for processing. In the prior art, different grinding accuracies in multi-stage grinding often require the use of different grinding equipment, which reduces the grinding efficiency. At the same time, different grinding equipment reduces the grinding accuracy, and the agglomerates formed between the micropowders significantly reduce the grinding efficiency, increase the energy consumption, and affect the performance of the final product.

[0004] Therefore, it is necessary to design a multi-stage grinding equipment for silicon carbide powder production and a use method thereof that can perform multi-stage grinding and break up agglomerates. SUMMARY

[0005] In order to solve the above technical problems, the present application provides the following technical scheme: a multi-stage grinding equipment for silicon carbide powder production, comprising a grinding assembly, the grinding assembly comprises an upper shell and a propeller one, a ring groove is formed in the front end shaft of the propeller one, two groups of shaft shoulders are formed in the rear end shaft of the propeller one, a bearing is sleeved on the shaft between the two groups of shaft shoulders, the outer ring of the bearing is fixedly installed with a bearing seat one, the bearing is in interference fit with the shaft of the propeller one, two groups of the shaft shoulders are located on the outer side of the shaft, a ring groove is formed in the inner wall of the moving ring, the outer ring of the bearing seat one is fixedly installed in the ring groove, a bearing seat two is arranged on the front end shaft of the propeller one, the bearing seat two is connected with the shaft bearing of the propeller one, the outer ring of the bearing seat two is fixedly installed with a support disc, a plurality of connecting rods are fixedly installed at the front end of the support disc, a disc is fixedly connected to the end of the connecting rod away from the support disc, a circular hole is formed in the front end of the disc, the shaft of the propeller one penetrates through the circular hole, two groups of hydraulic cylinders are fixedly installed at the front end of the disc in a symmetrical manner, the output shaft of each group of hydraulic cylinders is perpendicular to the axis of the propeller one, a chuck is fixedly connected to the output end of each group of hydraulic cylinders, and the front and rear sides of each group of chucks are located in the same horizontal plane with the two sides of the ring groove.

[0006] According to the above technical scheme, the upper end of one side of the upper shell is fixedly installed with a base, a feeding port is formed in the area surrounded by the base, a plurality of electric heating wires are fixedly installed on the inner wall of the upper shell close to the feeding port, an observation hole is formed in the other upper end of the upper shell, hinge seats are fixedly installed at the upper end of the upper shell in a symmetrical manner, the hinge seats are located at the end of the observation hole facing the feeding port, a front plate is fixedly installed at the front end of the upper shell, and a rear plate is fixedly installed at the rear end of the upper shell.

[0007] According to the above technical scheme, a shaft hole one and a shaft hole two are formed in the front end of the front plate, a shaft hole three and a shaft hole four are formed in the front end of the rear plate, the shaft hole one is coaxial with the shaft hole three, the shaft hole two is coaxial with the shaft hole four, a feeding hopper is fixedly installed at the upper end of the base, an observation cover is arranged above the observation hole, the observation cover is hingedly connected with the hinge seat, a support plate and a motor one are fixedly installed at the rear end of the rear plate, a motor two is arranged at the rear end of the rear plate, the output shaft of the motor two is in sliding connection with the upper end of the support plate, the output shaft of the motor one is coaxial with the shaft hole four, the output shaft of the motor two is coaxial with the shaft hole three, and the motor two is a bidirectional motor.

[0008] According to the technical scheme, the lower end of the front plate is fixedly installed with a lower shell, the lower shell is located at the lower end of the propeller one, the bottom end of the lower shell is fixedly installed with a guide hopper, the front end of the guide hopper is fixedly installed with a boss, a discharge port is arranged in the area surrounded by the guide hopper, a motor box and a plurality of groups of support seats are fixedly installed in sequence along the lower end of the lower shell, and the inside of the motor box is fixedly installed with a motor three.

[0009] According to the technical scheme, the side of the motor box close to the discharge port is provided with a screw hole one, the side of the guide hopper close to the motor box is provided with a baffle hole, the side of the guide hopper opposite to the baffle hole is provided with a screw hole two, the output end of the motor three is fixedly connected with a screw rod, the output end of the screw rod penetrates through the screw hole one and the screw hole two and is connected with the boss bearing, the shaft of the screw rod is spirally connected with a baffle, the lower end of each group of support seats and the motor box is fixedly installed with a rack two, and the motor three is a bidirectional motor.

[0010] According to the technical scheme, the left end of the rack two is fixedly installed with a rack one, the upper end of the rack one is fixedly installed with a ball milling assembly, and the upper end of the rack one is fixedly installed with a motor four.

[0011] According to the technical scheme, the ball milling assembly comprises a roller, the front end of the roller is fixedly connected with the output end of the motor four, the rear end of the roller is connected with the rack one bearing, the shaft of the roller is provided with an inlet and outlet hole, the inner wall of the inlet and outlet hole is fixedly installed with a filter screen, the left end of the rack one is fixedly installed with a hydraulic telescopic machine one, the right end of the rack one is fixedly installed with a hydraulic telescopic machine two, the shaft of the roller is provided with a baffle ring, the baffle ring is axially slidably connected with the roller, the outer ring of the baffle ring is fixedly installed with a baffle block at the left end and the right end, and a plurality of ball milling media are placed in the roller.

[0012] According to the technical scheme, the ball milling assembly is located below the lower shell, the space surrounded by the lower shell and the upper shell is provided with a propeller two, the blades of the propeller one and the propeller two are alternately arranged, the front end shaft of the propeller two and the propeller one is fixedly installed with a limiting ring, the front end and the rear end of the shaft of the propeller two are respectively connected with the shaft hole two and the shaft hole four bearing, the rear end shaft of the propeller two is fixedly connected with the output shaft of the motor one, the blades of the propeller one and the propeller two are opposite in rotation direction, the thread rise angles are complementary, and the pitches of the propeller one and the propeller two are the same.

[0013] According to the technical scheme, the rear end shaft body of the propeller one is fixedly connected with the output shaft of the motor two through the rotating shaft hole three, the moving ring is slidingly connected with the rotating shaft hole three, the shaft body of the propeller one penetrates through the rotating shaft hole one, the front end of the front plate is fixedly installed with a plurality of air pressure lifting rods, the air pressure lifting rods are installed around the rotating shaft hole one, and the output end of the air pressure lifting rod is fixedly connected with the rear end of the disc.

[0014] A use method of a multi-stage grinding equipment for silicon carbide powder production, comprising:

[0015] S1: using the propeller one, the propeller two and the heating wire to uniformly disperse the micro powder to be ground and dry the free water between the micro powder;

[0016] S2: using the air pressure lifting rod to control the distance between the propeller one and the propeller two, so that the pressure provided by the propeller one and the friction between the micro powder can destroy the dry shell of the micro powder;

[0017] S3: controlling the distance between the propeller one and the propeller two and the conveying direction to realize the grinding of different precision in the same grinding equipment;

[0018] S4: using the ball milling assembly to further grind the micro powder to the required particle size.

[0019] Compared with the prior art, the beneficial effects achieved by the present application are: the present application sets the grinding assembly, dynamically controls the position of the propeller one and the distance between the propeller one and the propeller two, realizes the crushing of the agglomerates and the regulation of the grinding precision of different groups. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0021] Figure 1 is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 is a schematic diagram of the grinding assembly structure of the present application;

[0023] Figure 3 is a schematic diagram of the rear oblique view of the grinding assembly of the present application;

[0024] Figure 4 is a schematic diagram of the upper shell structure of the present application;

[0025] Figure 5 is a schematic diagram of the rear plate structure of the present application;

[0026] Figure 6 is a schematic diagram of the lower shell structure of the present application;

[0027] Figure 7 is a schematic diagram of the lower shell of the present application;

[0028] Figure 8 is a schematic diagram of the lower shell of the present application;

[0029] Figure 9 is a schematic diagram of the grinding assembly of the present application;

[0030] Figure 10 is a schematic diagram of the A area of the present application;

[0031] Figure 11 is a schematic diagram of the propeller structure of the present application;

[0032] Figure 12 is a schematic diagram of the upper shell internal structure of the present application;

[0033] Figure 13 is a schematic diagram of the B area of the present application;

[0034] Figure 14 is a schematic diagram of the propeller of the present application;

[0035] Figure 15 is a schematic diagram of the ball mill structure of the present application;

[0036] Figure 16 is a schematic diagram of the C area of the present application;

[0037] In the figure: 1, frame one; 2, frame two; 3, grinding assembly; 4, ball mill assembly; 5, upper shell; 501, front plate; 502, rear plate; 6, lower shell; 7, feeding hopper; 8, observation cover; 9, motor one; 10, motor two; 11, support plate; 12, rotating shaft hole one; 13, rotating shaft hole two; 14, observation hole; 15, hinge seat; 16, feeding port; 17, base; 18, discharging port; 19, baffle; 20, boss; 21, guide hopper; 22, lead screw; 23, motor box; 24, support seat; 25, motor three; 26, propeller one; 27, propeller two; 28, pneumatic lifting rod; 29, hydraulic cylinder; 30, chuck; 31, disc; 32, limiting ring; 33, moving ring; 34, bearing seat one; 35, bearing; 36, bearing seat two; 37, support disc; 38, blocking ring; 39, access hole; 3901, filter screen; 40, roller; 4001, stop block; 41, motor four; 42, hydraulic telescopic machine one; 4201, hydraulic telescopic machine two; 43, connecting rod; 44, ring groove; 45, shaft shoulder; 46, rotating shaft hole three; 47, rotating shaft hole four; 48, heating wire; 49, circular hole. DETAILED DESCRIPTION

[0038] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0039] Please refer to Figures 1-16 The present application provides a technical solution: a multi-stage grinding equipment for silicon carbide powder production, comprising a rack one 1, a ball mill assembly 4 is fixedly installed at the upper end of the rack one 1, a rack two 2 is fixedly installed at the right side of the rack one 1, and a grinding assembly 3 is fixedly installed at the upper end of the rack two 2.

[0040] Reference Figures 2-5 The grinding assembly 3 comprises an upper shell 5, a base 17 is fixedly installed at the upper end of one side of the upper shell 5, a feeding port 16 is formed in the area surrounded by the base 17, an observation hole 14 is formed at the upper end of the other side of the upper shell 5, hinge seats 15 are fixedly installed at the upper end of the upper shell 5 in a symmetrical manner, the hinge seats 15 are located at the end of the observation hole 14 facing the feeding port 16, a front plate 501 is fixedly installed at the front end of the upper shell 5, a rear plate 502 is fixedly installed at the rear end of the upper shell 5, a rotating shaft hole one 12 and a rotating shaft hole two 13 are formed at the front end of the front plate 501, a rotating shaft hole three 46 and a rotating shaft hole four 47 are formed at the front end of the rear plate 502, the rotating shaft hole one 12 is coaxial with the rotating shaft hole three 46, the rotating shaft hole two 13 is coaxial with the rotating shaft hole four 47, a feeding hopper 7 is fixedly installed at the upper end of the base 17, an observation cover 8 is arranged above the observation hole 14 and is hingedly connected with the hinge seat 15, a support plate 11 and a motor one 9 are fixedly installed at the rear end of the rear plate 502, a motor two 10 is arranged at the rear end of the rear plate 502 and is slidingly connected with the upper end of the support plate 11, the output shaft of the motor one 9 is coaxial with the rotating shaft hole four 47, the output shaft of the motor two 10 is coaxial with the rotating shaft hole three 46, and the motor two 10 is a reversible motor.

[0041] Reference Figures 6-8The lower end of the front plate 501 is fixedly installed with a lower shell 6, the bottom end of the lower shell 6 is fixedly installed with a guide hopper 21, the front end of the guide hopper 21 is fixedly installed with a boss 20, a discharge port 18 is arranged in the area surrounded by the guide hopper 21, a motor box 23 and a plurality of groups of support seats 24 are fixedly installed along the lower end of the lower shell 6 in sequence, a motor three 25 is fixedly installed in the interior of the motor box 23, a screw hole one is arranged on the side of the motor box 23 close to the discharge port 18, a baffle hole is arranged on the side of the guide hopper 21 close to the motor box 23, a screw hole two is arranged on the side of the guide hopper 21 opposite to the baffle hole, the output end of the motor three 25 is fixedly connected with a screw rod 22, the output end of the screw rod 22 penetrates through the screw hole one and the screw hole two and is bearing-connected with the boss 20, a baffle 19 is screw-connected on the shaft body of the screw rod 22, the lower end of each group of support seats 24 and the motor box 23 is fixedly installed on the upper end of the rack two 2, and the motor three 25 is a bidirectional motor.

[0042] Reference Figures 9-14 A plurality of electric heating wires 48 are fixedly installed on the inner wall of the upper shell 5 close to the feeding port 16, a propeller one 26 and a propeller two 27 are arranged in the space surrounded by the upper shell 5 and the lower shell 6, the blades of the propeller one 26 and the propeller two 27 are arranged alternately, the front end and the rear end of the shaft body of the propeller two 27 are respectively bearing-connected with the rotating shaft hole two 13 and the rotating shaft hole four 47, and the rear end shaft body of the propeller two 27 is fixedly connected with the output shaft of the motor one 9.

[0043] The blades of the propeller one 26 and the propeller two 27 are opposite in rotation direction and complementary in thread rise angle, and the pitches of the propeller one 26 and the propeller two 27 are the same.

[0044] A ring groove 44 is arranged on the front end shaft body of the propeller one 26, the front end shaft bodies of the propeller one 26 and the propeller two 27 are fixedly installed with a limiting ring 32, two groups of shaft shoulders 45 are arranged on the rear end shaft body of the propeller one 26, a bearing 35 is sleeved on the shaft body between the two groups of shaft shoulders 45, the bearing 35 is interference-fitted with the shaft body of the propeller one 26, a bearing seat one 34 is fixedly installed on the outer ring of the bearing 35, a moving ring 33 is sleeved on the outer sides of the two ends of the two groups of shaft shoulders 45, the two groups of shaft shoulders 45 limit the moving ring 33, a ring groove is arranged on the inner wall of the moving ring 33, and the outer ring of the bearing seat one 34 is fixedly installed in the ring groove.

[0045] The shaft body of the propeller 26 penetrates the rotating shaft hole 12, the shaft body of the propeller 26 penetrating the rotating shaft hole 12 is provided with a bearing seat 36, the bearing seat 36 is in bearing connection with the shaft body of the propeller 26, the outer ring of the bearing seat 36 is fixedly installed with a support disc 37, the front end of the support disc 37 is fixedly installed with a plurality of connecting rods 43, the end of the connecting rod 43 away from the support disc 37 is fixedly connected with a disc 31, the front end of the disc 31 is provided with a circular hole 49, the shaft body of the propeller 26 penetrates the circular hole 49, the front end of the disc 31 is fixedly installed with two groups of hydraulic cylinders 29, the output end axis of each group of hydraulic cylinders 29 is perpendicular to the axis of the propeller 26, the output end of each group of hydraulic cylinders 29 is fixedly connected with a chuck 30, the front and back sides of each group of chucks 30 are respectively located in the same horizontal plane as the two sides of the annular groove 44, the front end of the front plate 501 is fixedly installed with a plurality of pneumatic lifting rods 28, the pneumatic lifting rods 28 are installed around the rotating shaft hole 12, and the output end of the pneumatic lifting rod 28 is fixedly connected with the rear end of the disc 31.

[0046] Reference Figure 15 、 Figure 16 The front end of the rack 1 is fixedly installed with a motor 41, the ball milling assembly 4 comprises a drum 40, the front end of the drum 40 is fixedly connected with the output end of the motor 41, the rear end of the drum 40 is in bearing connection with the rack 1, the shaft body of the drum 40 is provided with an inlet and outlet hole 39, the inner wall of the inlet and outlet hole 39 is fixedly installed with a filter screen 3901, the left end of the rack 1 is fixedly installed with a hydraulic telescopic machine 42, the right end of the rack 1 is fixedly installed with a hydraulic telescopic machine 4201, the shaft body of the drum 40 is sleeved with a blocking ring 38, the blocking ring 38 is in axial sliding connection with the drum 40, and the outer ring of the blocking ring 38 is fixedly installed with a blocking block 4001 on the left and right ends.

[0047] A plurality of ball milling media are placed in the drum 40, according to different production requirements, the ball milling media can be selected from steel balls, ceramic balls, pebbles and the like.

[0048] In this embodiment, the principles of each part and the effect statement can be introduced:

[0049] Method one: Due to the molecular interaction or liquid bridge and the like, the micro powder spontaneously aggregates to form larger agglomerates, the agglomerates absorb the grinding energy, reduce the effective transmission to the single particle breaking force, and the large agglomerates are broken first, while the small agglomerates may escape from the grinding, resulting in the existence of unbroken agglomerates and overground fine powder in the discharge, therefore, the agglomeration of the micro powder seriously affects the grinding efficiency of the micro powder.

[0050] The motor three 25 is started, so that the baffle 19 closes the discharge port 18, the heating wire 48 is powered on, the motor one 9 and the motor two 10 are started, so that the propeller one 26 and the propeller two 27 rotate, the silicon carbide powder to be ground is put into the feeding hopper 7, the powder falls into the inside of the upper shell 5 along the feeding hopper 7 through the feeding port 16, the rotating propeller one 26 and the propeller two 27 drive the powder to be uniformly dispersed above the lower shell 6, and the heating wire 48 dries the free water on the surface of the powder.

[0051] Specifically, the motor three 25 is started, the motor three 25 drives the screw rod 22 to rotate, the screw rod 22 threadedly drives the baffle 19 to move towards the direction close to the discharge port 18, until the front end of the baffle 19 contacts the inner wall of the guide hopper 21, at this time, the baffle 19 completely closes the discharge port 18.

[0052] The motor one 9 and the motor two 10 are started, because the rotation directions of the propeller one 26 and the propeller two 27 are different, the rotation directions of the motor one 9 and the motor two 10 are controlled to be opposite, so that the conveying directions of the propeller one 26 and the propeller two 27 with different rotation directions are the same, that is, the conveying direction is from the feeding port 16 to the discharge port 18, the heating wire 48 is powered on to generate heat, and the temperature in the space surrounded by the upper shell 5 and the lower shell 6 is increased.

[0053] The powder to be ground is put into the feeding hopper 7, the powder falls into the inside of the upper shell 5 along the feeding hopper 7 through the feeding port 16, because the pitches of the propeller one 26 and the propeller two 27 are the same, therefore, when the powder is conveyed, the amount of powder driven by every two adjacent blades is uniform, so that the powder is uniformly dispersed above the lower shell 6.

[0054] Further, the free water in the air adheres to the surface of the powder, so that liquid bridges are formed between the powders, the liquid bridges make the powders adsorb each other through surface tension to form stable agglomerates, the heating wire 48 increases the temperature in the space surrounded by the upper shell 5 and the lower shell 6, the high temperature dries the free water between the powders, the liquid bridges are destroyed with the drying of the free water, so that the agglomerates formed by the adsorption of the liquid bridges are separated again.

[0055] Method two: because the proportion of large-size powders in the powder to be ground is relatively large, the combined water in the large-size powders is difficult to separate when the large-size powders are dried, and because the intermolecular force is a physical property of the powder, when the water between the powders is completely separated, the powders still form agglomerates under the influence of the intermolecular force, which affects the grinding efficiency, the position of the propeller one 26 is adjusted through the air pressure lifting rod 28, so that the dried shell of the large-size powder is destroyed, the combined water in the large-size powder is dried, and the powders agglomerated due to the intermolecular force are destroyed, so that the adverse effects of the agglomeration on the grinding are effectively eliminated.

[0056] Method three: the propeller one 26 and the propeller two 27 are close to each other by the air pressure lifting rod 28, the size of the interval between the propeller one 26 and the propeller two 27 is controlled, thereby the size of the micro powder grinding is controlled, the propeller one 26 is rotated, the propeller two 27 is fixed, the high shear zone and the high pressure zone are formed in the close area, and the micro powder is ground.

[0057] Method four: on the basis of method three, the micro powder to be ground has been ground to the micron level, in order to continue to grind the micro powder, and prevent interference between the propeller one 26 and the propeller two 27 due to high grinding accuracy, therefore the ball milling method is adopted for further grinding.

[0058] Specifically, the motor four 41 is started, the motor four 41 drives the drum 40 to rotate, until the inlet and outlet hole 39 is located directly below the material guide hopper 21, the motor three 25 is started, the motor three 25 drives the lead screw 22 to rotate in the opposite direction, the threads of the lead screw 22 pull the baffle 19 away from the discharge port 18, the discharge port 18 is opened, the motor one 9 and the motor two 10 are started, the propeller one 26 and the propeller two 27 rotate in the opposite direction, so that the conveying directions of the propeller one 26 and the propeller two 27 are consistent, thereby driving the ground micro powder to enter the drum 40 through the material guide hopper 21, the hydraulic telescopic machine one 42 is started, the hydraulic telescopic machine one 42 drives the stop block 4001 located at the left end of the baffle ring 38 to move along the shaft body of the drum 40, the stop block 4001 drives the baffle ring 38 to move, and the inlet and outlet hole 39 is closed, the motor one 9 is started, the motor one 9 drives the drum 40 to rotate, because the baffle ring 38 is axially slidingly connected with the drum 40, therefore the baffle ring 38 always closes the inlet and outlet hole 39 in the rotating process of the drum 40, the micro powder and the ball milling medium collide and extrude in the drum 40, so that the micro powder is further ground and refined.

[0059] The motor four 41 is controlled to rotate the drum 40, so that the inlet and outlet hole 39 is located below the drum 40, the hydraulic telescopic machine two 4201 is started, the hydraulic telescopic machine two 4201 drives the stop block 4001 located at the right end of the baffle ring 38 to move in the opposite direction, the stop block 4001 drives the baffle ring 38 to move, and the inlet and outlet hole 39 is opened, the ground micro powder is filtered out through the filter screen 3901, and the ground micro powder is collected.

[0060] According to the above technical scheme, the method two includes the following specific steps:

[0061] Method two a: on the basis of method one, because the proportion of large size micro powder is relatively large in the micro powder to be ground, the proportion of small size micro powder is relatively small, and the small size micro powder is completely dried.

[0062] Further, after the free water on the surface of the large-size micro-powder is dried, a dry crust is formed on the surface of the micro-powder, the surface crust reduces the heat transfer efficiency inside the micro-powder, and it is more difficult to dry the combined water inside the micro-powder. In the process of grinding, the grinding causes the dry crust to fall off, the combined water inside the large-size micro-powder is exposed, and the micro-powder forms agglomerates again under the action of liquid bridges, affecting the grinding efficiency. Before the grinding starts, the position relationship between the propeller one 26 and the propeller two 27 is controlled to expose the combined water inside the large-size micro-powder for drying, thereby eliminating the influence of water on grinding.

[0063] Specifically, the output end of each group of hydraulic cylinders 29 is controlled to extend outward, and each group of hydraulic cylinders 29 drives the chuck 30 to move towards the shaft body of the propeller one 26. Since the front and rear sides of each group of chucks 30 are located in the same horizontal plane as the two sides of the ring groove 44, the symmetrically arranged chucks 30 are embedded in the ring groove 44, so that the shaft body of the propeller one 26 is clamped and fixed by the chucks 30 (as shown in Figure 13 ).

[0064] First, the output end of the pneumatic lifting rod 28 is controlled to retract, the pneumatic lifting rod 28 drives the disc 31 to move towards the front plate 501, the disc 31 drives the connecting rod 43 and the hydraulic cylinder 29 to move in the same direction, the connecting rod 43 drives the support disc 37 to move in the same direction, the support disc 37 drives the bearing seat two 36 to move in the same direction, the hydraulic cylinder 29 drives the chuck 30 to move in the same direction, and the chuck 30 drives the propeller one 26 to move in the same direction.

[0065] Since the shaft body of the propeller one 26 is provided with two groups of shaft shoulders 45, the shaft shoulders 45 move synchronously with the propeller one 26, the shaft shoulders 45 drive the moving ring 33 to move away from the rear plate 502, the shaft shoulders 45 drive the internally fixed bearing seat one 34 to move in the same direction, the bearing seat one 34 drives the bearing 35 to move in the same direction, and the propeller one 26 drives the motor two 10 to move away from the rear plate 502 along the support plate 11, so that the rear side of the blade of the propeller one 26 continuously approaches the front side of the blade of the propeller two 27.

[0066] In this process, the propeller one 26 drives the micro-powder located on the rear side of the blade to continuously approach the blade of the propeller two 27. The output end of the pneumatic lifting rod 28 is continuously controlled to retract. Since the propeller two 27 is fixed, in the process of the two groups of blades approaching each other, the propeller one 26 continuously applies pressure to the micro-powder between the blades, and through the friction between the pressure and the micro-powder, the dry crust on the surface of the large-size micro-powder is destroyed, so that the combined water inside the large-size micro-powder is exposed, thereby drying the combined water.

[0067] Further, the output end of the air pressure lifting rod 28 is extended, so as to drive the propeller one 26 to make the front side of the blade of the propeller one 26 and the rear side of the blade of the propeller two 27 continuously close. The moving principle of the propeller one 26 is consistent with the moving principle when the output end of the air pressure lifting rod 28 is retracted, but the direction is opposite.

[0068] By the propeller one 26 exerting pressure on the micro powder between the front side of the blade and the rear side of the blade of the propeller two 27, under the action of the friction between the pressure and the micro powder, the dry shell of the large size micro powder is broken, so as to expose the combined water, and the combined water is dried by high temperature to eliminate the agglomeration caused by the liquid bridge.

[0069] Method two b: on the basis of method two a, since the propeller one 26 and the propeller two 27 are not rotating, the micro powder between every two adjacent groups of blades is accumulated under the action of its own gravity, so that in the process of the propeller one 26 and the propeller two 27 approaching, the thicker the micro powder accumulation is in the area closer to the edge of the blade, the more stable the accumulation structure of the micro powder is in the area with greater thickness, the smaller the pressure on the micro powder in the internal accumulation structure is, and the friction between the micro powder is reduced due to the stable structure, so that part of the dry shell of the large size micro powder in the middle area of the accumulation cannot be broken, affecting the grinding efficiency. The propeller one 26 is moved back and forth by the air pressure lifting rod 28, and the moving principle is consistent with that in method two a. The propeller one 26 pushes the micro powder between the two groups of blades to move and break the accumulation structure of the micro powder.

[0070] Further, since the propeller two 27 is in a fixed state, in the above moving process, the propelling force of the propeller one 26 on the micro powder between the two groups of blades is unidirectional, that is, the front side of the blade of the propeller one 26 exerts forward propelling force on the micro powder, and the rear side of the blade of the propeller one 26 exerts backward propelling force on the micro powder. The unidirectional propelling force makes it difficult for the micro powder close to the propeller two 27 to be pushed by the propeller one 26, so that a dead zone appears in the area below the propeller two 27 blade, and the accumulation structure in the dead zone still has a certain stability, so that part of the large size micro powder is difficult to be completely dried. By rotating the propeller two 27, the propeller two 27 conveys the micro powder, so as to break the structure of the dead zone.

[0071] It should be noted that in method two b, in order to prevent the propeller one 26 and the propeller two 27 from interfering with each other, the reciprocating motion of the propeller one 26 and the rotation of the propeller two 27 should be alternately performed. By the complex motion of alternately performing, the accumulation structure of the micro powder is broken, so that the shell of the large size micro powder can be broken, and then the large size particles are completely dried.

[0072] Further, since the intermolecular force is the inherent physical property of the substance, after the influence of the liquid bridge is eliminated, the secondary agglomeration of the fine powder still occurs under the influence of the intermolecular force. With the decrease of the particle size of the fine powder, the specific surface area gradually increases, resulting in the significant increase of the exposure degree of the surface atoms or molecules, so that the intermolecular force is enhanced. In this process, the small particle size fine powder is more easily adsorbed on the surface of the large particle size fine powder, forming an agglomerate with a complex structure, thereby seriously affecting the grinding efficiency. Since the strength of the intermolecular force is relatively weak, in the absence of the liquid bridge, only a moderate mechanical extrusion is needed to destroy the agglomeration.

[0073] By using the gas pressure lifting rod 28 and the electric heating wire 48, the influence of the agglomerate in the fine powder on the grinding is eliminated, and the grinding efficiency is optimized.

[0074] According to the above technical solution, the method three includes the following specific steps:

[0075] Method three a: the propeller one 26 is close to the propeller two 27 by the gas pressure lifting rod 28, the propeller one 26 is rotated, the propeller two 27 is fixed, the high shear zone and the high pressure zone are formed in the bonding area, and the grinding of the fine powder is realized.

[0076] Specifically, the gas pressure lifting rod 28 is controlled, and then the propeller one 26 is close to the propeller two 27. The movement principle of the propeller one 26 is consistent with the movement principle in the method two a, the propeller two 27 is fixed, the motor two 10 is started, the motor two 10 drives the propeller one 26 to rotate, the rotating propeller one 26 pushes the fine powder through the gap between the propeller one 26 and the fixed propeller two 27, so that the fine powder is broken by the shear stress, and the size of the gap between the propeller one 26 and the propeller two 27 is determined by the production requirement.

[0077] It should be noted that since the propeller one 26 rotates, the fine powder is pushed by the blade, so the gap between the propeller one 26 and the propeller two 27 is the necessary link for the movement of the fine powder, and therefore only the motor two 10 is started to realize the grinding of the fine powder by using the gap between the propeller one 26 and the propeller two 27.

[0078] Method three b: on the basis of method three a, since the propeller two 27 is fixed, the propeller one 26 rotates, the propeller one 26 pushes the micro powder to move, and forces the micro powder to pass through the gap to grind, so in the grinding process, the collision and impact between the micro powder and the blade, and the shearing force of the blade provide kinetic energy for the micro powder, under the influence of the kinetic energy, the motion trajectory of the micro powder changes, so that the micro powder appears high-speed movement or jumping phenomenon, part of the micro powder falls into the area of the propeller two 27, due to the fixation of the propeller two 27, part of the micro powder scatters in the range of the propeller two 27, no longer participates in the movement, so that the amount of product micro powder is reduced, affecting the production efficiency, by starting the motor one 9, the propeller two 27 rotates, driving the micro powder accumulated in the range of the propeller two 27 to move.

[0079] It should be noted that in the present method, the motor one 9 and the motor two 10 are controlled to make the rotation directions of the propeller one 26 and the propeller two 27 opposite, since the rotation directions of the propeller one 26 and the propeller two 27 are different, therefore when the rotation directions are different, the conveying directions of the propeller one 26 and the propeller two 27 are the same, the same conveying direction avoids the accumulation of micro powder in the middle area of the rotation shaft of the propeller one 26 and the propeller two 27, affecting the grinding and transportation efficiency of the micro powder.

[0080] Method three c: on the basis of method three b, since the baffle 19 closes the discharge port 18, the propeller one 26 and the propeller two 27 with the same conveying direction transport a large amount of micro powder to the area of the discharge port 18, a large amount of accumulated micro powder affects the rotation efficiency of the propeller one 26 and the propeller two 27, and blocks the gap between the blades near the discharge port 18, affecting the grinding of part of the micro powder, by controlling the motor two 10, the propeller one 26 rotates in the opposite direction, conveying the accumulated micro powder to the area away from the discharge port 18.

[0081] Specifically, the motor two 10 is controlled to make the propeller one 26 rotate in the opposite direction, that is, the rotation directions of the propeller one 26 and the propeller two 27 are the same at this time, since the rotation directions are different, therefore the conveying directions of the propeller one 26 and the propeller two 27 are opposite, at this time, the conveying direction of the propeller one 26 is away from the discharge port 18, and the conveying direction of the propeller two 27 is close to the discharge port 18, since there is a gap between the propeller one 26 and the propeller two 27, and the rotation directions are different, therefore in this process, the propeller one 26 and the propeller two 27 do not interfere with each other.

[0082] Further, due to the bidirectional conveying between the propeller one 26 and the propeller two 27, bidirectional shearing force is generated, which further improves the grinding efficiency, and the bidirectional shearing force further destroys the accumulation structure and accelerates the destruction of the accumulation structure.

[0083] Further, due to the difference in the conveying direction, the micropowder moving in different directions stops moving due to mutual impact, and new accumulation occurs in the middle part of the propeller one 26 and the propeller two 27, so after the propeller one 26 and the propeller two 27 rotate in the same direction for a period of time, the motor one 9 should be turned off to stop the rotation of the propeller two 27, and the propeller one 26 continues to convey the micropowder away from the discharge port 18, thereby destroying the accumulation of the micropowder.

[0084] Method three d: In order to reduce energy consumption and improve grinding accuracy, the target grinding accuracy is achieved by multiple progressive grinding. On the basis of method three c, the micropowder is uniformly distributed again during the process of the propeller one 26 conveying the micropowder away from the discharge port 18, and the gap between the propeller one 26 and the propeller two 27 is controlled by controlling the air pressure lifting rod 28, thereby completing the grinding requirement of multiple levels of different sizes. For example, in the primary grinding, the micropowder needs to be ground from millimeter level to coarse micron level (100-500 ), the micropowder reaching the coarse micron level is uniformly distributed again by method three c, and the gap between the blades is adjusted by controlling the air pressure lifting rod 28, so that the micropowder is further crushed to the medium micron level (20-100 ), and by repeatedly performing method three c, multiple levels of grinding with different accuracy can be realized in the same grinding equipment.

[0085] The air pressure lifting rod 28 and the motor two 10 are used to control the conveying direction of the propeller one 26 and the gap between the blades, thereby realizing multiple levels of grinding of the micropowder, reducing the space volume of the multiple levels of grinding equipment, and optimizing the process of multiple levels of grinding.

[0086] A method for using a multiple level grinding equipment for producing silicon carbide micropowder, the steps are as follows:

[0087] S1: The propeller one 26, the propeller two 27 and the heating wire 48 are used to uniformly disperse the micropowder to be ground, and to dry the free water between the micropowder;

[0088] S2: The air pressure lifting rod 28 is used to control the gap between the propeller one 26 and the propeller two 27, so that the pressure provided by the propeller one 26 and the friction between the micropowder can destroy the dry shell of the micropowder;

[0089] S3: The gap between the propeller one 26 and the propeller two 27 and the conveying direction are controlled to realize multiple levels of grinding with different accuracy in the same grinding equipment;

[0090] S4: The ball milling assembly 4 is used to further grind the micropowder to a depth, so that the particle size of the micropowder meets the production requirements.

[0091] It is to be noted that, in the present text, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0092] Finally, it should be noted that the above-mentioned only constitutes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications, equivalent replacements, and improvements of the technical solutions described in the foregoing embodiments can be made. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. A multi-stage grinding device for the production of silicon carbide micro powder, comprising a grinding assembly (3) and a frame (1), characterized in that: The grinding assembly (3) includes an upper shell (5) and a propeller (26). An annular groove (44) is formed on the front shaft of the propeller (26), and two sets of shoulders (45) are formed on the rear shaft of the propeller (26). A bearing (35) is fitted on the shaft between the two sets of shoulders (45). A bearing seat (34) is fixedly installed on the outer ring of the bearing (35). The bearing (35) is interference-fitted with the shaft of the propeller (26). Moving rings (33) are fitted on the outer sides of the two sets of shoulders (45), limiting the movement of the moving rings (33). An annular groove is formed on the inner wall of the moving rings (33). The outer ring of seat one (34) is fixedly installed in the annular groove. A bearing seat two (36) is provided on the front shaft of propeller one (26). The bearing seat two (36) is connected to the shaft of propeller one (26). A support plate (37) is fixedly installed on the outer ring of bearing seat two (36). Several connecting rods (43) are fixedly installed on the front end of the support plate (37). A disc (31) is fixedly connected to the end of the connecting rod (43) away from the support plate (37). A circular hole (49) is opened at the front end of the disc (31). The shaft of propeller one (26) passes through the circular hole (49). Two sets of hydraulic cylinders (2) are symmetrically fixedly installed on the front end of the disc (31). 9), the output axis of each hydraulic cylinder (29) is perpendicular to the axis of the propeller (26), and a chuck (30) is fixedly connected to the output end of each hydraulic cylinder (29). The front and rear sides of each chuck (30) are respectively located on the same horizontal plane as the two sides of the annular groove (44). A base (17) is fixedly installed on the upper side of one side of the upper shell (5). A feed inlet (16) is opened in the area enclosed by the base (17). Several heating wires (48) are fixedly installed on the inner wall of the upper shell (5) near the feed inlet (16). A front plate (501) is fixedly installed at the front end of the upper shell (5), and a lower shell is fixedly installed at the lower end of the front plate (501). 6) A ball mill assembly (4) is fixedly installed on the upper end of the frame (1). The ball mill assembly (4) is located below the lower shell (6). A propeller (27) is arranged in the space enclosed by the lower shell (6) and the upper shell (5). The blades of the propeller (26) and the propeller (27) are arranged alternately. The blades of the propeller (26) and the propeller (27) rotate in opposite directions and have complementary thread lift angles. The pitches of the propeller (26) and the propeller (27) are the same. Several pneumatic lifting rods (28) are fixedly installed at the front end of the front plate (501). The output end of the pneumatic lifting rod (28) is fixedly connected to the rear end of the disc (31).

2. The multi-stage grinding equipment for silicon carbide micro powder production according to claim 1, characterized in that: An observation hole (14) is provided on the upper end of the other side of the upper shell (5). A hinge seat (15) is symmetrically fixedly installed on the upper end of the upper shell (5). The hinge seat (15) is located at the end of the observation hole (14) facing the feed port (16). A rear plate (502) is fixedly installed at the rear end of the upper shell (5).

3. A multi-stage grinding device for producing silicon carbide micro powder according to claim 2, characterized in that: The front plate (501) has a pivot hole 1 (12) and a pivot hole 2 (13) at its front end, and the rear plate (502) has a pivot hole 3 (46) and a pivot hole 4 (47) at its front end. The pivot hole 1 (12) is coaxial with the pivot hole 3 (46), and the pivot hole 2 (13) is coaxial with the pivot hole 4 (47). A feed hopper (7) is fixedly installed on the upper end of the base (17). An observation cover (8) is provided above the observation hole (14). The rear plate (502) is hinged to the hinge seat (15). The rear end of the rear plate (502) is fixedly installed with a support plate (11) and a motor (9). The rear end of the rear plate (502) is provided with a motor (10). The motor (10) is slidably connected to the upper end of the support plate (11). The output shaft of the motor (9) is coaxial with the shaft hole (47). The output shaft of the motor (10) is coaxial with the shaft hole (46). The motor (10) is a bidirectional motor.

4. A multi-stage grinding device for producing silicon carbide micro powder according to claim 3, characterized in that: The lower shell (6) is located at the lower end of the propeller (26). A guide hopper (21) is fixedly installed at the bottom end of the lower shell (6). A boss (20) is fixedly installed at the front end of the guide hopper (21). A discharge port (18) is opened in the area enclosed by the guide hopper (21). A motor box (23) and several sets of support seats (24) are fixedly installed along the lower end of the lower shell (6). A motor (25) is fixedly installed inside the motor box (23).

5. A multi-stage grinding device for producing silicon carbide micro powder according to claim 4, characterized in that: The motor housing (23) has a lead screw hole one on the side near the discharge port (18), the guide hopper (21) has a baffle hole on the side near the motor housing (23), the guide hopper (21) has a lead screw hole two on the side opposite to the baffle hole, the output end of the motor three (25) is fixedly connected to a lead screw (22), the output end of the lead screw (22) passes through the lead screw hole one and the lead screw hole two and is connected to the bearing of the boss (20), the shaft of the lead screw (22) is spirally connected to a baffle (19), each set of support base (24) and the lower end of the motor housing (23) are fixedly installed with a frame two (2), the motor three (25) is a bidirectional motor.

6. A multi-stage grinding device for producing silicon carbide micro powder according to claim 5, characterized in that: The left end of the second frame (2) is fixedly installed with the first frame (1), and the upper end of the first frame (1) is fixedly installed with the fourth motor (41).

7. A multi-stage grinding device for producing silicon carbide micro powder according to claim 6, characterized in that: The ball mill assembly (4) includes a roller (40). The front end of the roller (40) is fixedly connected to the output end of the motor (41). The rear end of the roller (40) is connected to the bearing of the frame (1). The roller (40) has an inlet and outlet hole (39) on its shaft. A filter screen (3901) is fixedly installed on the inner wall of the inlet and outlet hole (39). A hydraulic telescopic machine (42) is fixedly installed on the left end of the frame (1). A hydraulic telescopic machine (4201) is fixedly installed on the right end of the frame (1). A retaining ring (38) is sleeved on the shaft of the roller (40). The retaining ring (38) is axially slidably connected to the roller (40). A stop block (4001) is fixedly installed on both the left and right ends of the outer ring of the retaining ring (38). A number of ball milling media are placed inside the roller (40).

8. A multi-stage grinding device for producing silicon carbide micro powder according to claim 7, characterized in that: The front end shafts of both propeller 2 (27) and propeller 1 (26) are fixedly fitted with limit rings (32). The front and rear ends of the shaft of propeller 2 (27) are respectively connected to the bearings of shaft hole 2 (13) and shaft hole 4 (47). The rear end shaft of propeller 2 (27) is fixedly connected to the output shaft of motor 1 (9).

9. A multi-stage grinding device for producing silicon carbide micro powder according to claim 8, characterized in that: The rear shaft of the propeller (26) passes through the shaft hole (46) and is fixedly connected to the output shaft of the motor (10). The moving ring (33) is slidably connected to the shaft hole (46). The shaft of the propeller (26) passes through the shaft hole (12). The air pressure lifting rod (28) is installed around the shaft hole (12).

10. A method of using a multi-stage grinding device for silicon carbide micro powder production, implemented according to claim 9, characterized in that: S1: Using propeller one (26), propeller two (27) and heating wire (48), the micro powder to be ground is evenly dispersed and the free water between the micro powder is dried; S2: By using the pneumatic lifting rod (28), the distance between the first propeller (26) and the second propeller (27) is controlled, so that the pressure provided by the first propeller (26) and the friction between the micro powder will destroy the dry outer shell of the micro powder; S3: Control the spacing and conveying direction between propeller one (26) and propeller two (27) to realize grinding of various precisions in the same grinding equipment; S4: Using the ball mill assembly (4), the micro powder is further ground to achieve the required particle size.

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