Metal powder production ball mill with automatic screening function

Abstract

The present application relates to the technical field of metal powder production equipment, and discloses a ball mill with automatic screening function for metal powder production, which comprises a base support assembly for supporting an outer drum assembly in rolling, a feeding assembly is further fixed to the right end of the base support assembly, and the bottom end of the feeding assembly horizontally extends into the outer drum assembly; a gear drive assembly is connected with an inner drum assembly at the right end inside the outer drum assembly, and an auger assembly is arranged in the middle of the right end of the inner drum assembly and extends into the bottom end of the feeding assembly. The present application integrates grinding and screening and is efficient in production: through the integrated design of the sieve cylinder and the ball mill cylinder in the inner drum assembly, the grinding and screening are integrated. The ground material can be directly screened in the sieve cylinder, the qualified fine powder falls into the outer drum for collection, and the coarse particles are retained for secondary grinding, so that the equipment floor area and the material transfer loss are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of metal powder production equipment technology, specifically to a ball mill with automatic sieving function for metal powder production. Background Technology

[0002] Ball mills process raw materials through mechanical grinding, and their working process can be summarized in the following steps: Raw material input and cylinder rotation: Raw materials (lumps, granules, or fragments of metal) enter the cylinder through the feed inlet, along with an appropriate amount of grinding media (steel balls of varying sizes). The drive system rotates the cylinder around a horizontal axis, and the grinding media and raw materials rise to a certain height with the cylinder under the action of centrifugal force and friction.

[0003] The motion and forces of the grinding media: When the cylinder rotates to a certain angle, the grinding media and raw materials fall due to gravity, generating the following two main forces: Impact: Larger grinding balls fall from a height, impacting the raw material particles and breaking them into smaller particles. Grinding / friction: The relative movement between smaller grinding balls or between balls and the cylinder wall compresses, rubs, and shears the raw material particles, further refining the particles and making them uniformly mixed.

[0004] Circulating grinding and refining: The raw material continuously rises, falls, rolls, and slides within the cylinder along with the grinding media, undergoing multiple impacts and grinding processes. Fine particles are gradually discharged through the discharge device, while particles that do not meet the particle size requirements continue to be ground within the cylinder until they meet the standards.

[0005] In the field of metal powder production, traditional ball mills face numerous technical bottlenecks that limit the improvement of production efficiency and product quality: Traditional ball mills only have a grinding function; the ground material must be transferred to a separate screening device for grading and screening. This not only increases equipment investment and floor space but also extends the production cycle, and the material is prone to secondary contamination or loss during the transfer process. Traditional ball mills mostly rotate in one direction, resulting in simple relative movement between the steel balls and the material during grinding, leading to a low impact frequency, which is insufficient to meet the production requirements of high-hardness metals or ultrafine powders. Furthermore, traditional feeding and sealing design flaws exist: traditional feeding methods are mostly open manual dumping or gravity feeding, lacking continuity and stability in the feeding process, easily leading to material accumulation or blockage, affecting production efficiency. Therefore, we have introduced a ball mill with automatic screening function for metal powder production. Summary of the Invention

[0006] The purpose of this invention is to provide a ball mill with automatic sieving function for the production of metal powder, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A ball mill with automatic sieving function for metal powder production includes a base support assembly for rolling support of an outer roller assembly, and a feeding assembly is fixed to the right end of the base support assembly. The bottom end of the feeding assembly extends horizontally into the outer roller assembly. The inner roller assembly is connected to the right end of the outer roller assembly by a gear drive assembly, and the right end of the inner roller assembly is provided with an auger assembly that extends into the bottom end of the feeding assembly. The inner roller assembly includes a screen cylinder that is rolled and supported inside the outer roller assembly and a ball mill cylinder that is centrally located inside the screen cylinder. The left end of the ball mill cylinder is provided with a tapered cylinder with a gradually decreasing diameter, and the inner wall of the tapered cylinder is provided with discharge inclined plates at equal intervals. The servo motor on the base support assembly drives the outer roller assembly to rotate. The outer roller assembly drives the inner roller assembly and the auger assembly to rotate through the gear drive assembly. The rotation of the auger assembly is used to convey the steel balls and metal raw materials in the feeding assembly to the ball mill cylinder for grinding. After grinding, the servo motor drives the outer roller assembly to reverse, so that the inner roller assembly reverses and discharges the ground raw materials inside to the screen cylinder for screening.

[0008] Preferably, the base support assembly includes a base, support rollers disposed on the upper end of the base, and a bracket fixed to the upper right side of the base; The outer roller assembly includes an outer roller, a connecting plate fixed to the right end of the outer roller, a drive outer gear ring fixed by several sets of equally spaced connecting protrusions on the side of the connecting plate, and a central limiting cylinder connected in the middle of the connecting plate. The top of the support roller is located in the annular limiting groove corresponding to the outer side of the outer roller, and the central limiting cylinder extends through the top of the bracket.

[0009] Preferably, the outer roller has an opening groove in the middle, and the opening groove is sealed by a sealing plate; The left end cap of the outer roller is used for sealing; The top of the bracket is also equipped with a bearing that is sleeved on the outside of the central limiting cylinder.

[0010] Preferably, the servo motor is mounted on the base, and the motor gear at the output end of the servo motor meshes with the bottom of the drive external gear ring.

[0011] Preferably, the feeding assembly includes a feeding hopper and a horizontal pipe connected to the bottom of the feeding hopper by a bent pipe. The horizontal pipe is fixed on the mounting seat at the right end of the bracket, and the left end of the horizontal pipe extends into the outer roller through the central limiting cylinder.

[0012] Preferably, the gear drive assembly includes an internal gear ring bolted to the right end of the inner drum, a threaded ring threaded to the outside of the left end of the horizontal tube, planetary gears movably connected to the left end of support arms that are evenly spaced on the outside of the threaded ring, and a central external gear ring fixed to the right end of the inner drum assembly. The planetary gear meshes between the internal gear ring and the central external gear ring.

[0013] Preferably, the auger assembly includes a sleeve cylinder that communicates with the ball mill cylinder at the middle of the right end of the inner drum assembly, a rotating shaft that is fixed to the inner wall of the sleeve cylinder by a horizontal plate, and a spiral blade that is fixed after the right end of the rotating shaft extends into the interior of the horizontal pipe. The outer wall of the sleeve is connected to the inner wall of the central outer toothed ring by connecting arms that are evenly spaced. The sleeve is fitted onto the outer side of the left end of the horizontal pipe.

[0014] Preferably, the outer ends of the sieve cylinder are fixed with annular support seats, which are supported on the inner wall of the outer drum. Connecting plates are evenly distributed on the outer wall of the left end of the ball mill cylinder. The opposite ends of the sieve cylinder are sealed with discs, which are fixed to the left end of the connecting plates with screws.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention integrates grinding and screening for high-efficiency production: Through the integrated design of the screen cylinder and the ball mill cylinder in the inner drum assembly, grinding and screening are achieved in one unit. The ground material can be directly screened inside the screen cylinder; qualified fine powder falls into the outer drum for collection, while coarse particles are retained for secondary grinding. This reduces equipment footprint and material transfer losses, improving production efficiency. Planetary gear differential transmission further enhances energy efficiency: The planetary gear drive assembly enables the outer and inner drum assemblies to rotate in opposite directions at different speeds. This increases the relative speed between the steel balls and the material, increases the impact frequency, and significantly improves grinding efficiency.

[0016] Sealed feeding and control, environmentally friendly and stable: The feeding assembly adopts a sealed conveying structure with horizontal pipes and spiral blades, forming a sealed channel with a central limiting cylinder, reducing dust leakage compared to traditional open feeding. Automatic spiral blade feeding ensures continuous material conveying and reduces the probability of blockage. Furthermore, the grinding and discharging processes are controlled by a servo motor in both forward and reverse rotation, making operation simple and highly automated. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of the overall assembly of the present invention; Figure 2 This is a schematic diagram of the outer roller assembly of the present invention; Figure 3 This is a schematic diagram of the base support assembly of the present invention; Figure 4This is an exploded structural diagram of the assembly of the base support component and the feeding component of the present invention; Figure 5 This is an exploded structural diagram of the assembly of the inner roller assembly and the gear drive assembly of the present invention. Figure 6 For the present invention Figure 5 A schematic diagram of the three-dimensional structure from another perspective; Figure 7 This is a schematic diagram of the assembly of the feeding component, gear drive component, and inner roller component of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the cross-sectional structure at point AA; Figure 9 This is a three-dimensional structural diagram of the entire invention; Figure 10 For the present invention Figure 9 A schematic diagram of the three-dimensional structure from another perspective; Figure 11 For the present invention Figure 10 Schematic diagram of the cross-sectional structure at point BB.

[0018] In the picture: 1. Outer roller assembly; 101. Outer roller; 102. Annular limiting groove; 103. Opening groove; 104. Sealing plate; 105. Connecting disc; 106. Drive external gear ring; 107. Connecting protrusion; 108. Center limiting cylinder; 2. Base support assembly; 201. Base; 202. Support rollers; 203. Bracket; 204. Bearing; 205. Mounting base; 206. Servo motor; 207. Motor gear; 3. Feeding assembly; 301. Feeding hopper; 302. Bend; 303. Horizontal pipe; 4. Gear drive assembly; 401. Central external gear ring; 4011. Connecting arm; 402. Bolt; 403. Threaded ring; 404. Support arm; 405. Planetary gear; 406. Internal gear ring; 5. Inner drum assembly; 501. Screen cylinder; 502. Annular support seat; 503. Conical cylinder; 504. Connecting plate; 505. Discharge inclined plate; 506. Ball mill cylinder; 507. Liner plate; 6. Disc; 7. Sealed end cap; 8. Screw assembly; 801. Spiral blade; 802. Shaft; 803. Sleeve sleeve; 804. Horizontal plate. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: Please see Figure 1-11 The present invention provides a technical solution: A ball mill for producing metal powder with automatic sieving function includes a base support assembly 2 for rolling support outer roller assembly 1; The base support assembly 2 includes a base 201, a support roller 202 provided on the upper end of the base 201, and a bracket 203 fixed on the upper right side of the base 201; The outer roller assembly 1 includes an outer roller 101, a connecting plate 105 fixed to the right end of the outer roller 101, a drive outer gear ring 106 fixed by several sets of equally spaced connecting protrusions 107 on the side of the connecting plate 105, and a central limiting cylinder 108 connected in the middle of the connecting plate 105. The top of the support roller 202 is located in the annular limiting groove 102 corresponding to the outer side of the outer roller 101, and the central limiting cylinder 108 extends through the top of the bracket 203.

[0021] The outer roller 101 has an opening groove 103 in the middle, which is sealed by a sealing plate 104; this makes it easy to open during maintenance to clean the inside or replace parts; the sealing plate 104 is opened to collect the screened metal powder from the opening groove 103.

[0022] The left end of the outer roller 101 is sealed by the sealing end cap 7; the left end is sealed by the sealing end cap 7 to prevent dust from leaking out during the grinding process.

[0023] The top of the bracket 203 is also equipped with a bearing 204 that is sleeved on the outside of the central limiting cylinder 108. The bracket 203 and the central limiting cylinder 108 are connected by the bearing 204 to eliminate axial movement, ensure the coaxiality of the outer roller 101 when it rotates, and avoid vibration and noise caused by eccentricity.

[0024] The servo motor 206 is mounted on the base 201, and the motor gear 207 at the output end of the servo motor 206 meshes with the bottom of the drive external gear ring 106.

[0025] The base 201 serves as the basic structure, bearing the weight of the entire ball mill. The bracket 203 fixed at the upper right end of the base supports the central limiting cylinder 108 through the internal bearing 204, ensuring the axial positioning of the outer roller assembly 1 when it rotates.

[0026] The support roller 202 is installed on the upper end of the base 201, and its top is located in the annular limiting groove 102 on the outer side of the outer roller 101, forming a rolling support. When the outer roller 101 rotates, the support roller 202 reduces resistance through rolling friction, allowing the outer roller to rotate smoothly at high speed.

[0027] When the servo motor 206 is running, it drives the outer roller 101 to rotate through the gear transmission between the motor gear 207 and the drive outer gear ring 106.

[0028] The connecting plate 105 fixes the outer roller 101 and the drive outer gear ring 106 together via the connecting protrusion 107 to ensure synchronous power transmission. The central limiting cylinder 108 passes through the bracket 203, and its inner side cooperates with the horizontal pipe 303 of the feeding component 3 to form a material conveying channel.

[0029] The motor gear 207 and the drive external gear ring 106 adopt spur gear meshing, which has high transmission efficiency, is more precise than belt drive, can withstand large torque loads, and is suitable for high-load working conditions of metal grinding.

[0030] The drive outer gear ring 106 is rigidly connected to the outer roller 101 through the connecting protrusion 107, which avoids slippage in power transmission, ensures constant rotation speed during grinding, and improves the uniformity of powder particle size.

[0031] The right end of the base support assembly 2 is also fixed with a feeding assembly 3, and the bottom end of the feeding assembly 3 extends horizontally into the outer roller assembly 1; The feeding assembly 3 includes a feeding hopper 301 and a horizontal pipe 303 connected to the bottom of the feeding hopper 301 by a bent pipe 302. The horizontal pipe 303 is fixed on the mounting seat 205 at the right end of the bracket 203, and the left end of the horizontal pipe 303 extends into the outer roller 101 through the central limiting cylinder 108.

[0032] The feeding hopper 301 serves as the raw material inlet, receiving steel balls and metal raw materials (such as metal blocks and scrap). Its bottom is connected to the horizontal pipe 303 through the bent pipe 302, forming a material transition channel from vertical to horizontal.

[0033] The left end of the horizontal tube 303 passes through the central limiting cylinder 108 and extends into the outer drum 101. The spiral blades 801 inside rotate, and the material is pushed from the horizontal tube 303 into the ball mill cylinder 506 through the spiral rotation.

[0034] The horizontal pipe 303 is fixed to the right end of the bracket 203 by the mounting base (205) to ensure stable position during the conveying process and avoid material blockage due to vibration.

[0035] The central limiting cylinder 108 not only provides axial positioning for the horizontal pipe 303, but also rotates synchronously with the outer roller 101, so that a relatively static sealed channel is formed between the horizontal pipe 303 and the outer roller 101 to prevent material leakage.

[0036] The straight structure of the horizontal tube 303, combined with the pushing action of the spiral blade 801, enables continuous feeding, reducing the probability of clogging compared to traditional tube feeding.

[0037] Sealed channel design: The nested structure of the horizontal tube 303 and the central limiting cylinder 108 forms a sealed interface. Combined with the rotation of the outer roller 101, it prevents dust from overflowing from the feed port during the grinding process, and the amount of dust leakage is reduced compared with the traditional open feeding method.

[0038] The horizontal tube 303 is connected to the bracket 203 by screws via the mounting base 205. It can be removed simply by loosening the screws, which shortens the time required to replace worn spiral blades 801 or clean residual materials inside the tube.

[0039] Precise axial positioning: The coaxiality error between the center limiting cylinder 108 and the horizontal tube 303 is ≤0.1mm, ensuring that the spiral blade 801 will not rub against the tube wall when the outer drum 101 rotates, thus reducing equipment wear.

[0040] The inner roller assembly 5 is connected to the right end of the outer roller assembly 1 by a gear drive assembly 4. The gear drive assembly 4 includes an internal gear ring 406 fixed to the right end of the inner side of the outer roller 101 by bolts 402, a threaded ring 403 threaded to the outer side of the left end of the horizontal tube 303, a planetary gear 405 movably connected to the left end of the support arms 404 evenly distributed on the outer side of the threaded ring 403, and a central external gear ring 401 fixed to the right end of the inner roller assembly 5. Planetary gear 405 meshes between internal gear ring 406 and central external gear ring 401.

[0041] The function of gear drive component 4: Differential speed grinding: The outer roller 101 and the ball mill cylinder 506 rotate in opposite directions, forming a speed difference, which enhances the relative motion between the steel balls and the material and improves grinding efficiency.

[0042] Compact structure: The gear drive assembly 4 integrates power transmission and deceleration functions, reducing space occupation and simplifying the drive chain.

[0043] The outer roller 101 is driven to rotate by the servo motor 206, and the inner toothed ring 406 fixed at its right end rotates synchronously.

[0044] The threaded ring 403 at the left end of the horizontal tube 303 is connected to the planetary gear 405 through the support arm 404, forming a fixed fulcrum. When the internal gear ring 406 rotates, the planetary gear 405 rotates under the drive of the internal gear ring 406 and revolves around the axis of the horizontal tube 303.

[0045] The planetary gear 405 meshes with the central external gear ring 401 (fixed at the right end of the inner roller assembly 5) and transmits power to the inner roller assembly 5, causing it to rotate in the opposite direction to the outer roller 101.

[0046] By adjusting the tooth ratio of the inner gear ring 406 to the central outer gear ring 401 (usually 2:1 to 3:1), differential rotation between the outer roller 101 and the inner roller assembly 5 can be achieved. For example, when the outer roller rotates clockwise, the inner roller assembly rotates counterclockwise, and the speed difference between the two can reach 30-50 rpm, enhancing the grinding effect.

[0047] Reverse rotation: The reverse motion of the outer roller 101 and the inner roller assembly 5 increases the relative speed between the steel ball and the material by more than 2 times, increases the impact frequency by 50%, and improves the grinding efficiency. It can refine the particle size of metal powder from 50μm in the traditional process to below 10μm.

[0048] Planetary gear reduction: The reduction ratio of planetary gear systems can reach 5-10:1. Under the same motor power, the output torque is increased, which is suitable for grinding high-hardness metals (such as stainless steel and titanium alloys).

[0049] By integrating the power distribution system inside the outer roller 101, the volume is reduced and the axial length of the equipment is shortened compared to traditional multi-stage gearboxes, making it suitable for scenarios with limited factory space.

[0050] Modular disassembly: The threaded connection between the screw ring 403 and the horizontal tube 303, and the movable connection between the support arm 404 and the planetary gear 405, allow individual gears to be disassembled and replaced independently, reducing maintenance time from 8 hours to 2 hours.

[0051] Lubrication optimization: A sealed space is formed between the right annular support 502, the right side of the inner roller assembly 5, the inside of the right end of the outer roller 101, and the outside of the sleeve 803 to store lubricating oil. The planetary gear 405, the inner gear ring 406, and the central outer gear ring 401 are immersed in the lubricating oil inside the outer roller 101. Automatic lubrication reduces the frequency of manual maintenance and extends the gear life.

[0052] The inner roller assembly 5 is provided with an auger assembly 8 at the middle right end, which extends into the bottom end of the feeding assembly 3; The auger assembly 8 includes an inner drum assembly 5 with a sleeve 803 connected to the ball mill cylinder 506 at the middle of the right end, a rotating shaft 802 fixed to the inner wall of the sleeve 803 by a horizontal plate 804, and a spiral blade 801 fixed after the right end of the rotating shaft 802 extends into the interior of the horizontal tube 303. The outer wall of the sleeve 803 is connected to the inner wall of the central outer toothed ring 401 by connecting arms 4011 with equal spacing. The sleeve 803 is fitted onto the outer side of the left end of the horizontal pipe 303.

[0053] Sealed conveying of auger assembly 8: To prevent leakage: The sleeve 803 is fitted on the outside of the horizontal pipe 303 to form a sealed structure, preventing dust from spilling out during the grinding process.

[0054] Automatic feeding: The spiral blades 801 automatically push the material to the ball mill cylinder 506 when rotating, without the need for an additional power source.

[0055] The inner roller assembly 5 includes a screen cylinder 501 that is rolled and supported inside the outer roller assembly 1, and a ball mill cylinder 506 that is centrally located inside the screen cylinder 501. The inner wall of the ball mill cylinder 506 is equipped with a liner 507 installed by a long screw (not shown in the figure). The outer end of the long screw can penetrate the ball mill cylinder 506 and extend into the sieve cylinder 501. When the inner roller assembly 5 rotates, it plays a stirring role when the coarse particles in the sieve cylinder 501 are ground for a second time.

[0056] Annular support seats 502 are fixed at both ends of the outer side of the sieve cylinder 501. The annular support seats 502 are supported on the inner wall of the outer roller 101. A sealing ring is provided on the annular support seats 502, so that a sealed space is formed between the two sets of annular support seats 502, the outer roller 101 and the sieve cylinder 501 to receive the metal powder screened by the sieve cylinder 501.

[0057] The outer wall of the left end of the ball mill cylinder 506 is provided with connecting plates 504 at equal intervals. The opposite end of the sieve cylinder 501 is sealed with a disc 6, which is fixed to the left end of the connecting plate 504 with screws.

[0058] The left end of the ball mill cylinder 506 is provided with a tapered cylinder 503 with a gradually decreasing diameter, and the inner wall of the tapered cylinder 503 is provided with discharge inclined plates 505 at equal intervals; Automatic material discharge via conical cylinder 503 and discharge inclined plate 505: Forward and reverse rotation control: When rotating forward, the discharge inclined plate 505 prevents the material from being discharged; when rotating in reverse, the material slides along the inclined plate into the screen cylinder 501, realizing the separation control of grinding and discharge.

[0059] Grading and grinding: Coarse particles that do not meet the particle size requirements are retained in the ball mill cylinder 506 for further grinding to improve the quality of the finished product.

[0060] The servo motor 206 on the base support assembly 2 is used to drive the outer roller assembly 1 to rotate. The outer roller assembly 1 drives the inner roller assembly 5 and the auger assembly 8 to rotate through the gear drive assembly 4. The rotation of the auger assembly 8 is used to convey the steel balls and metal raw materials in the feeding assembly 3 to the ball mill cylinder 506 for grinding. After grinding, the servo motor 206 drives the outer roller assembly 1 to reverse, so that the inner roller assembly 5 reverses and discharges the ground raw materials inside to the screen cylinder 501 for screening.

[0061] Outer roller assembly 1: As the main support structure, it is supported by the support rollers 202 on the base support assembly 2 and driven to rotate by the servo motor 206.

[0062] Inner roller assembly 5: includes screen cylinder 501 and ball mill cylinder 506, and is connected to outer roller assembly 1 through gear drive assembly 4 to achieve relative rotation.

[0063] Feeding component 3: Used to feed steel balls and metal raw materials, and the materials are conveyed into the ball mill cylinder 506 through the auger component 8.

[0064] Gear drive assembly 4: adopts a planetary gear structure to enable differential rotation between the outer roller 101 and the inner roller assembly 5, thereby improving grinding efficiency.

[0065] Specifically, when using it: Raw material transportation stage: Feeding: Pour steel balls and metal raw materials into feeding hopper 301, and the material enters horizontal pipe 303 through bend pipe 302.

[0066] Screw conveyor: Servo motor 206 drives outer roller assembly 1 to rotate clockwise, which in turn drives inner roller assembly 5 and screw assembly 8 to rotate synchronously via gear drive assembly 4. Spiral blades 801 push material from horizontal pipe 303 into ball mill cylinder 506.

[0067] Grinding stage: The ball mill cylinder 506 rotates: the outer roller 101 drives the ball mill cylinder 506 to rotate counterclockwise (opposite to the direction of the outer roller 101) through the gear drive assembly 4, forming differential motion.

[0068] Impact and Grinding: The steel balls and raw materials inside the ball mill cylinder 506 continuously tumble and collide during rotation, using the impact and friction of the steel balls to grind the metal raw materials into fine powder.

[0069] Optimized design of conical cylinder 503: The conical cylinder 503 at the left end of the ball mill cylinder 506 and the discharge inclined plate 505 prevent the material from being discharged too early during forward rotation, ensuring thorough grinding.

[0070] Screening stage: Reverse discharge: After grinding is completed, the servo motor 206 reverses, driving the outer roller assembly 1 to rotate counterclockwise, while the inner roller assembly 5 rotates clockwise. At this time, the discharge inclined plate 505 guides the material from the ball mill cylinder 506 into the screen cylinder 501.

[0071] Screening and separation: The screen cylinder 501 rotates with the outer drum 101. Qualified fine powder falls into the outer drum 101 through the screen holes, while coarse particles continue to remain in the screen cylinder 501 for secondary grinding.

[0072] Collecting finished products: Open the sealing plate 104 of the outer roller 101 to collect the sieved metal powder from the opening groove 103.

[0073] This invention adopts a modular design: Easy to maintain: The components are detachably connected by bolts, threaded rings, etc., making it easy to replace worn parts such as screen cylinders and liners.

[0074] Expandability: By adjusting the screen hole size of the screen cylinder 501 or replacing the steel balls with different diameters, it can adapt to different particle size requirements.

[0075] Integrated screening function: Traditional ball mills require additional screening equipment. This invention integrates grinding and screening through a built-in screen cylinder 501, reducing floor space and equipment investment.

[0076] Bidirectional rotation control: The grinding and discharging are controlled by switching between forward and reverse rotation of the servo motor 206, simplifying the operation process.

[0077] Sealing and pollution prevention: The nested design of the horizontal pipe 303 and the sleeve 803, as well as the sealing structure of the outer roller 101, effectively prevent dust leakage and meet environmental protection requirements.

[0078] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ball mill with automatic screening function for metal powder production, comprising a base support assembly for supporting a outer drum assembly for rolling, characterized in that: The right end of the base support assembly is also fixed with a feeding assembly, and the bottom end of the feeding assembly extends horizontally into the outer roller assembly. The inner roller assembly is connected to the right end of the outer roller assembly by a gear drive assembly, and the right end of the inner roller assembly is provided with an auger assembly that extends into the bottom end of the feeding assembly. The inner roller assembly includes a screen cylinder that is rolled and supported inside the outer roller assembly and a ball mill cylinder that is centrally located inside the screen cylinder. The left end of the ball mill cylinder is provided with a tapered cylinder with a gradually decreasing diameter, and the inner wall of the tapered cylinder is provided with discharge inclined plates at equal intervals. The servo motor on the base support assembly is used to drive the outer roller assembly to rotate. The outer roller assembly drives the inner roller assembly and the auger assembly to rotate through the gear drive assembly. The rotation of the auger assembly is used to convey the steel balls and metal raw materials in the feeding assembly to the ball mill cylinder for grinding. After grinding, the servo motor drives the outer roller assembly to reverse, so that the inner roller assembly reverses and discharges the ground raw materials inside to the screen cylinder for screening. The base support assembly includes a base, support rollers provided on the upper end of the base, and a bracket fixed to the upper right side of the base; The outer roller assembly includes an outer roller, a connecting plate fixed to the right end of the outer roller, a drive outer gear ring fixed by several sets of equally spaced connecting protrusions on the side of the connecting plate, and a central limiting cylinder connected in the middle of the connecting plate. The top of the support roller is located in the annular limiting groove corresponding to the outer side of the outer roller, and the central limiting cylinder extends through the top of the bracket; The feeding assembly includes a feeding hopper and a horizontal pipe connected to the bottom of the feeding hopper by a bent pipe. The horizontal pipe is fixed on the mounting base at the right end of the bracket, and the left end of the horizontal pipe extends into the outer roller through the central limiting cylinder. The gear drive assembly includes an internal gear ring bolted to the right end of the inner drum, a threaded ring threaded to the outside of the left end of the horizontal tube, planetary gears movably connected to the left end of the support arms that are evenly spaced on the outside of the threaded ring, and a central external gear ring fixed to the right end of the inner drum assembly. The planetary gear meshes between the internal gear ring and the central external gear ring; The auger assembly includes an inner drum assembly with a sleeve in the middle of the right end that communicates with the ball mill cylinder, a rotating shaft fixed to the inner wall of the sleeve by a horizontal plate, and a spiral blade that is fixed after the right end of the rotating shaft extends into the interior of the horizontal pipe. The outer wall of the sleeve is connected to the inner wall of the central outer toothed ring by connecting arms that are evenly spaced. The sleeve is fitted onto the outer side of the left end of the horizontal pipe; The outer ends of the sieve cylinder are fixed with annular support seats, which are supported on the inner wall of the outer drum. The outer wall of the left end of the ball mill cylinder is provided with connecting plates at equal intervals. The opposite ends of the sieve cylinder are sealed with discs, which are fixed to the left end of the connecting plates with screws.

2. A ball mill with automatic screening function for metal powder production according to claim 1, characterized in that: The outer roller has an opening groove in the middle, and the opening groove is sealed by a sealing plate; The left end of the outer roller is sealed with a sealing end cap; The top of the bracket is also equipped with a bearing that is sleeved on the outside of the central limiting cylinder.

3. A ball mill with automatic screening function for metal powder production according to claim 1, characterized in that: The servo motor is mounted on the base, and the motor gear at the output end of the servo motor meshes with the bottom of the drive external gear ring.

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