Screening device for aluminum oxide production after grinding

Abstract

The invention relates to the field of aluminum oxide screening, and discloses an aluminum oxide production after-grinding screening device which comprises a feeding mechanism, a first screening mechanism is arranged at a discharging port of a ball mill, the first screening mechanism comprises a plurality of screen plate assemblies hinged in sequence, and every two adjacent screen plate assemblies comprise two screen plates hinged to each other; according to the aluminum oxide screening device, the screening mechanisms are arranged, the screening mechanisms are arranged, the screening mechanisms are arranged, every two adjacent screening plate assemblies can be alternately stretched and folded, the stretched screening plate assemblies can screen aluminum oxide, and the folded screening plate assemblies can convey the aluminum oxide, and compared with the prior art, the aluminum oxide screening device has the beneficial effects that the screening mechanisms are arranged for alternate screening design; an additional conveying mechanism is not needed; the grinding material driving mechanism drives the rotating shaft and the vibration driving block to rotate, the telescopic rod piece and the abutting wheel drive the side plate of the first screening mechanism to vibrate at high frequency, raw materials are accelerated to penetrate through the screen, particles clamped on the folding screen plate assembly can be shaken off, screen holes are prevented from being blocked, and compared with a traditional fixed screen plate, the screening efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of alumina screening, in particular to a screening device for alumina after grinding. BACKGROUND

[0002] Alumina is a core raw material for the electrolytic aluminum, ceramics, refractory material and other industries, and its production process needs to go through key links such as 'raw material crushing-grinding-dissolution-settlement-roasting', wherein the particle size control of the raw material after grinding directly determines the efficiency of the subsequent process. Therefore, the screening of the raw material grinding discharge is a core link in alumina production to ensure process stability and improve resource utilization.

[0003] The traditional screening device relies on a single fixed sieve plate for particle size separation. Due to uneven particle size distribution of alumina after grinding, the sieve hole is prone to blockage, resulting in low screening efficiency and frequent shutdown for cleaning. The specific defects are as follows: Since the sieve hole size of the fixed sieve plate is fixed, if the alumina after grinding is stuck in the sieve hole during screening, the finer alumina after grinding is prone to accumulate at the sieve hole to form a 'bridge', which continuously increases the sieve hole blockage rate, thereby reducing the screening efficiency. And each blockage requires manual cleaning during shutdown, which directly affects the continuity of alumina production. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the above difficulties and provide a screening device for alumina after grinding.

[0005] A screening device for alumina after grinding, comprising a feeding mechanism located at the inlet of a ball mill, the feeding mechanism guides the alumina raw material to the ball mill through the guide groove at the bottom for grinding, and a screening mechanism one is arranged at the outlet of the ball mill to screen the alumina after grinding, the screening mechanism one comprises a plurality of sieve plate assemblies connected in sequence, two adjacent sieve plate assemblies comprise two sieve plates connected with each other, and the two adjacent sieve plate assemblies can alternately expand and fold, the expanded sieve plate assembly can screen the alumina, and the folded sieve plate assembly can convey the alumina.

[0006] As an improvement, the screening mechanism one further comprises a discharge chute one, the discharge chute one comprises a discharge plate inclined to one side, side plates are arranged on both sides of the discharge plate, a plurality of sieve plate assemblies are arranged between the two side plates, and the plurality of sieve plate assemblies are driven to complete the expansion and folding work by the driving mechanism arranged on the side plates, and the sieve plate assemblies are arranged on the side plates in a whole inclined manner.

[0007] As an improvement, the hinged ends of the screen plate assemblies at the center and on both sides are provided with a vertically downward base plate. The bottom of the base plate is provided with a horizontally placed base rod. The end of the base rod passes through the side plate and can slide up and down on the side plate. The driving mechanism includes an electric telescopic rod fixed to the side plate. The telescopic end of the electric telescopic rod is fixed to the base rod at the center. Several driving rods are rotatably provided on the side plate. Both ends of the driving rods are provided with sliding grooves. The end of the base rod slides in the sliding groove.

[0008] As an improvement, a cover is hinged to the discharge chute, which is located at the discharge port of the ball mill. A dust cover is provided on one side of the cover, and a return material mechanism is provided on one side of the ball mill. The return material mechanism can transport larger alumina particles after screening by the screen plate to the feed port of the ball mill. A screening mechanism is provided between the return material mechanism and the guide chute.

[0009] As an improvement, the screening mechanism 2 includes a discharge trough 2 that connects the return material mechanism and the guide trough. The discharge trough 2 is provided with screen holes and a hopper that is connected to the bottom of the discharge trough 2 through the screen holes. A guide pipe connects the hopper and the discharge trough 1.

[0010] As an improvement, the return material mechanism includes a conveying trough, in which a spiral conveyor driven by a drive motor is installed. The spiral conveyor can transport alumina particles along the conveying trough. The top of the conveying trough is connected to the discharge trough. A slide rail is provided at the side end of the conveying trough, and a cleaning mechanism is slidably installed on the slide rail. The cleaning mechanism moves up and down under the action of the spiral conveyor and gravity, and can clean the spiral conveyor when it moves upward.

[0011] As an improvement, the cleaning mechanism includes a slider that slides on a slide rail, a top frame on the slider, a through groove inside the top frame, a scraper that slides in the through groove, one end of the scraper having an abutment surface that abuts against the top of the feed trough, and the other end of the scraper abutting against a spiral feeder, a slot on the side wall of the top frame, a guide rod inside the slot, an end block that slides with the guide rod at the end of the abutment surface, a spring two that fits around the guide rod on the end block, a support plate at the bottom of the feed trough, an abutment end on the support plate, an extension plate on the scraper, an abutment rod that slides into the extension plate, and a limiting block at the end of the abutment rod that abuts against the abutment end.

[0012] As an improvement, an abrasive drive mechanism that can drive the ball mill to rotate is provided on one side of the ball mill, and a vibration drive mechanism that can drive the screening mechanism to vibrate is provided at the output end of the abrasive drive mechanism. The vibration drive mechanism includes a rotating shaft driven by an abrasive drive mechanism. The rotating shaft is supported and limited by a fixed seat on the ball mill. A vibration drive block is provided at the end of the rotating shaft. A telescopic rod is provided on one side plate. An abutment wheel that is rolledly connected to the vibration drive block is provided at the top of the telescopic rod. A spring is sleeved on the telescopic rod.

[0013] As an improvement, the vibration drive block consists of two semi-circular blocks of different sizes. The smaller semi-circular block is coaxial with the rotating shaft, and the two semi-circular blocks are connected at one end.

[0014] The advantages of this invention compared to the prior art are as follows: 1. This device employs an alternating screening design with a screening mechanism, where adjacent components can alternately extend and fold under the drive of an electric telescopic rod. The extended screen plate assembly screens the raw materials, while the folded assembly conveys coarse materials to the screening area, eliminating the need for an additional conveying mechanism. Simultaneously, the abrasive drive mechanism rotates the shaft and vibration drive block, which in turn drives the side plate of the screening mechanism to vibrate at high frequency through the telescopic rod and abutment wheel. This accelerates the screening of raw materials and dislodges particles stuck on the folded screen plate assembly, preventing screen blockage. Compared to traditional fixed screen plates, this significantly improves screening efficiency.

[0015] 2. In the return material mechanism of this device, when the screw conveyor is driven by the drive motor to transport coarse material, it can also drive the cleaning mechanism to move at the same time. The blades of the screw conveyor push the scraper, so that the slider moves up along the slide rail. Under the action of the spring, the scraper always sticks to the screw blade and cleans the raw material in real time, avoiding the drawback of traditional return material that requires manual cleaning at regular intervals.

[0016] 3. This device features optimized two-stage screening and dust prevention design. After primary screening in screening mechanism one, coarse material is conveyed to screening mechanism two via a screw conveyor. The screen holes on discharge trough two separate the refined material from the coarse material. The fine material falls into the hopper and returns to discharge trough one via a guide pipe, avoiding waste. Simultaneously, the cover and dust cover of screening mechanism one prevent abrasive and dust generated during screening, solving the dust pollution problem of traditional equipment. Furthermore, the scraper of the cleaning mechanism cleans the screw conveyor in real time, further improving raw material utilization. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a screening device after abrasive in alumina production according to the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the overall structure of a screening device after abrasive in alumina production according to the present invention. Figure 2 .

[0019] Figure 3 This is a schematic diagram showing the overall structure of a screening device after abrasive processing for alumina production according to the present invention.

[0020] Figure 4 This is a schematic diagram of the screening mechanism of a screening device for abrasives used in alumina production according to the present invention. Figure 1 .

[0021] Figure 2This is a schematic diagram of the screening mechanism of a screening device for abrasives used in alumina production according to the present invention. Figure 6 .

[0022] Figure 7 This is a partial structural diagram of the screening mechanism of a screening device for abrasives used in alumina production according to the present invention.

[0023] Figure 8 This is a schematic diagram of the cleaning mechanism of a screening device for abrasives used in alumina production according to the present invention.

[0024] Figure 1 This invention relates to a screening device after abrasive processing in alumina production. Figure 1 Schematic diagram of the structure at point A in the middle.

[0025] As shown in the figure: 1. Feeding mechanism; 2. Guide chute; 3. Abrasive drive mechanism; 301. Rotating shaft; 302. Fixed base; 303. Vibration drive block; 304. Telescopic rod; 305. Abutment wheel; 306. Spring 1; 4. Screening mechanism 1; 401. Discharge chute 1; 402. Screen plate; 403. Base plate; 404. Base rod; 405. Electric telescopic rod; 406. Drive rod; 407. Slide chute; 408. Cover; 409. Dust cover; 5. Return mechanism; 501. Conveying material. 502. Screw conveyor; 503. Slide rail; 6. Screening mechanism II; 601. Discharge trough II; 602. Screen hole; 603. Hopper; 604. Guide pipe; 7. Cleaning mechanism; 701. Slider; 702. Top frame; 703. Through groove; 704. Scraper; 705. Abutment surface; 706. Slot; 707. End block; 708. Guide rod; 709. Spring II; 710. Extension plate; 711. Abutment rod; 712. Limiting block; 713. Support plate; 714. Abutment end. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] Combined with appendix Figure 2 Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 Appendix Figure 1 As shown: A screening device for abrasive grinding in alumina production includes a feeding mechanism 1 located at the feed inlet of a ball mill. The feeding mechanism 1 guides alumina raw material into the ball mill for grinding via a bottom guide chute 2. A screening mechanism 4 is provided at the discharge outlet of the ball mill to screen the alumina raw material after grinding. The screening mechanism 4 includes several screen plate assemblies that are hinged in sequence. Two adjacent screen plate assemblies include two screen plates 402 that are hinged to each other. The two adjacent screen plate assemblies can be alternately extended and folded. The extended screen plate assembly can screen alumina, and the folded screen plate assembly can convey alumina.

[0028] The working principle of this invention is as follows: This device uses "feeding-grinding-grading and screening-returning" as its core logic. The feeding mechanism 1 transports alumina raw materials to the ball mill, the grinding drive mechanism 3 drives the ball mill to grind the materials and provides vibration force for screening; the screening mechanism 4 achieves primary screening and conveying through the alternating extension / folding of the screen plate assembly; the return mechanism 5 transports coarse materials to the screening mechanism 6 for secondary separation, the fine materials return to the settling point, and the coarse materials return to the ball mill for re-grinding; the cleaning mechanism 7 ensures smooth return. All modules work together to achieve efficient grinding and precise screening of raw materials, improving raw material utilization and production efficiency. The operator pours the alumina raw material to be ground into the feeding mechanism 1, which then conveys the raw material at a uniform speed to the bottom guide chute 2 via a conveyor belt. The raw material slides down the inclined guide chute 2 under gravity and smoothly enters the ball mill feed inlet, completing the raw material supply before grinding. This simplifies the raw material feeding process and reduces the intensity of manual feeding; the stable feeding speed can match the grinding rhythm of the ball mill, avoiding problems such as "empty grinding" or "overload" caused by uneven feeding.

[0029] Combined with appendix Figure 4 Appendix Figure 5 Appendix Figure 6 Appendix Figure 6 As shown: The screening mechanism 4 also includes a discharge trough 401, which includes a discharge plate that is inclined to one side. Side plates are provided on both sides of the discharge plate, and several screen plate assemblies are arranged between the two side plates. The screen plate assemblies are driven by a drive mechanism on the side plates to complete the extension and folding work. The screen plate assemblies are arranged on the side plates at an overall inclination. A vertically downward base plate 403 is provided at the bottom of the hinged ends of the screen plate assemblies located at the center and on both sides. A horizontally placed base rod 404 is provided at the bottom end of the base plate 403. The end of the base rod 404 passes through the side plate and can slide up and down on the side plate. The driving mechanism includes an electric telescopic rod 405 fixed to the side plate. The telescopic end of the electric telescopic rod 405 is fixedly connected to the base rod 404 at the center. Several driving rods 406 are rotatably provided on the side plate. Both ends of the driving rods 406 are provided with sliding grooves 407. The end of the base rod 404 slides within the sliding grooves 407. A cover 408 is hinged to the discharge chute 401. The cover 408 is located at the discharge port of the ball mill, and a dust cover 409 is provided on one side of the cover 408. A return material mechanism 5 is provided on one side of the ball mill. The return material mechanism 5 can transport larger alumina particles after screening by the screen plate 402 to the feed port of the ball mill. A screening mechanism 6 is provided between the return material mechanism 5 and the guide chute 2.

[0030] The raw material ground by the ball mill falls from the discharge port into the discharge chute 401. The cover 408 and dust cover 409 prevent dust from spreading. The electric telescopic rod 405 drives the central bottom rod 404 to move up and down. The central bottom rod 404, through the drive rod 406, drives the two side bottom rods 404 to move synchronously in opposite directions. When the central bottom rod 404 moves upward, the screen plate assemblies on both sides are pulled by the drive rod 406 to extend, and the screen plate assembly where the central bottom rod 404 is located folds. Figure 1 As shown, the raw material falls onto the screen plate assembly. At this time, the screen plate assembly in the extended state can screen the raw material. The raw material on the higher screen plate assembly will gradually fall onto the extended screen plate assembly, while the raw material that cannot be screened out cannot continue to move down due to the obstruction of the lower screen plate assembly.

[0031] The folded screen assembly can convey materials along the inclined direction of the screen assembly to the extended screen assembly, where the extended screen assembly can perform screening. The folded screen assembly can shake off particles stuck in the screening holes under vibration, thus avoiding reduced screening efficiency due to blockage of the screening holes during the next screening operation. Conversely, when the bottom rod 404 at the center moves down, the screen assembly extends for screening and folds on both sides for conveying, realizing "alternating screening-conveying". At the same time, the vibration drive mechanism drives the side plates to vibrate, accelerating the screening and conveying of raw materials. It is worth noting that since several parts of the screen assembly are in an inclined state, the raw materials will move to the lower part of the screen assembly and gather when the screen assembly is extended. When the extended screen assembly turns to the folded state, the gathered raw materials will move to the next screen assembly under the upward lifting action of the screen plate 402. Screening mechanism 4 can perform primary screening on the ground raw materials to separate fine materials that meet the particle size requirements; by alternately extending / folding the screen plate assembly, screening and coarse material collection are achieved simultaneously, avoiding the need for a separate conveying mechanism; The alternating operation of several screen plate assemblies allows screening and conveying to proceed simultaneously, improving processing efficiency; the dustproof design reduces dust pollution and meets environmental protection requirements; the folding structure of the screen plate assemblies can reduce the space occupied by the equipment and adapt to workshop layout.

[0032] Combined with appendix Figure 2 Appendix Figure 3 Appendix Figure 1 As shown: The screening mechanism 2 6 includes a discharge trough 2 601 that connects the return material mechanism 5 and the guide trough 2. The discharge trough 2 601 is provided with a screen hole 602 and a hopper 603 that is connected through the screen hole 602 is provided at the bottom of the discharge trough 2 601. A guide pipe 604 is connected between the hopper 603 and the discharge trough 1 401. The return material mechanism 5 includes a conveying trough 501, in which a spiral conveyor 502 driven by a drive motor is provided. The spiral conveyor 502 can convey alumina particles along the conveying trough 501. The top of the conveying trough 501 is connected to the discharge trough 601. A slide rail 503 is provided at the side end of the conveying trough 501. A cleaning mechanism 7 is slidably provided on the slide rail 503. The cleaning mechanism 7 moves up and down under the action of the spiral conveyor 502 and gravity. When the cleaning mechanism 7 moves upward, it can clean the spiral conveyor 502.

[0033] Working principle of return material mechanism 5: The coarse material separated by screening mechanism 1 4 falls into the conveying trough 501. The drive motor starts and drives the spiral conveyor 502 to rotate. The blades of the spiral conveyor 502 push the coarse material along the axis of the conveying trough 501 towards screening mechanism 2 6, so as to avoid the coarse material from accumulating in the conveying trough 501. At the same time, the slide rail 503 provides vertical sliding guide for the cleaning mechanism 7, ensuring that the cleaning mechanism 7 can clean synchronously with the spiral conveyor 502.

[0034] The return material mechanism 5 can transport the coarse material after primary screening to the secondary screening stage, realize the recycling of coarse material and avoid waste of raw materials; it provides a motion basis for the cleaning mechanism 7 and ensures smooth return material channel.

[0035] The screw conveyor system is suitable for the stickiness and particle characteristics of coarse materials, avoiding blockages; it eliminates the need for manual cleaning of coarse materials, reducing labor intensity and improving the comprehensive utilization rate of raw materials.

[0036] Working principle of screening mechanism 2 6: After the coarse material conveyed by the return material mechanism 5 enters the discharge trough 2 601, it slides down along the inclined trough. During the process, some fine material that is not fully screened in the first stage or is refined by friction falls into the hopper 603 below through the screen hole 602. The fine material in the hopper 603 is conveyed to the discharge trough 401 of screening mechanism 1 4 through the guide pipe 604, and is discharged after merging with the fine material screened in the first stage. The coarse material that has not passed through the screen continues to slide down and finally falls into the guide trough 2 of the feeding mechanism 1, and enters the ball mill for re-grinding along with the new raw material.

[0037] Screening mechanism 2 performs a secondary screening of the returned coarse material, separating out the qualified fine material to prevent it from re-entering the ball mill and increasing the load; the truly unground coarse material is sent back to the ball mill to improve the grinding targeting. This reduces the amount of ineffective grinding material in the ball mill, lowering energy consumption and equipment wear; the secondary screening also increases the fine material recovery rate, further improving raw material utilization.

[0038] Combined with appendix Figure 2 AppendixFigure 7 Appendix Figure 1 As shown: The cleaning mechanism 7 includes a slider 701 that slides on a slide rail 503. A top frame 702 is provided on the slider 701. A through groove 703 is provided inside the top frame 702. A scraper 704 slides within the through groove 703. One end of the scraper 704 has an abutment surface 705 that abuts against the top of the conveying trough 501, and the other end of the scraper 704 abuts against the spiral conveyor 502. A slot 706 is provided on the side wall of the top frame 702, and a guide rod 708 is provided within the slot 706. The end of the contact surface 705 is provided with an end block 707 that is slidably connected to the guide rod 708. The end block 707 is provided with a spring 709 that is sleeved on the guide rod 708. The bottom of the conveying trough 501 is provided with a support plate 713. The support plate 713 is provided with an abutment end 714. The scraper 704 is provided with an extension plate 710. An abutment rod 711 is slidably inserted into the extension plate 710. The end of the abutment rod 711 is provided with a limiting block 712 that abuts against the abutment end 714.

[0039] Working principle of cleaning mechanism 7: When the spiral conveyor 502 rotates, its blades push the end of the scraper 704 upward, and the slider 701 moves upward synchronously along the slide rail 503; during the movement of the slider 701, the abutment rod 711 is located in the through groove 703, and the second spring 709 can limit the contraction of the scraper 704, so that the scraper 704 is always in contact with the blades of the spiral conveyor 502 to scrape off the raw material adhering to the blades, so that the raw material is always in the conveying trough 501 and is conveyed upward by the spiral conveyor 502; when the abutment surface 705 abuts against the cover at the top of the conveying trough 501, the cover can drive the scraper 704 to contract into the through groove 703, and the scraper 704 drives the end block 707 to slide along the guide rod 708, and the second spring 709 is compressed and stored elastic force; when the scraper When the abutment rod 711 on 704 extends out of the through groove 703, the abutment rod 711 moves downward along the insertion direction with the extension plate 710 under the action of gravity. When the scraper 704 disengages from the screw conveyor 502, the scraper 704 tends to reset under the action of the second spring 709. However, due to the downward movement of the abutment rod 711, the abutment rod 711 has a limiting effect on the reset of the scraper 704. Then, under the action of gravity, the cleaning mechanism 7 will move downward along the slide rail 503. When the limiting block 712 at the end of the abutment rod 711 contacts the abutment end 714 of the support plate 713, the abutment end 714 can make the abutment rod 711 quickly reset under the action of impact. At this time, the second spring 709 can push the scraper 704 back to its original position under the action of elasticity, completing one cleaning cycle. The cleaning mechanism 7 can clean the raw materials adhering to the blades of the screw conveyor 502 in real time, preventing the raw materials from clumping and clogging the conveying trough 501, and ensuring smooth return material flow. Moreover, there is no need for manual cleaning of the screw conveyor 502 periodically, which can reduce maintenance costs. The cleaning action is synchronized with the screw conveyor, which does not affect the return material efficiency, and at the same time avoids the deterioration or equipment corrosion caused by long-term adhesion of raw materials.

[0040] Combined with appendixFigure 3 Appendix Figure 8 Appendix ​ As shown: A grinding drive mechanism 3 is provided on one side of the ball mill, which can drive the ball mill to rotate. A vibration drive mechanism is provided at the output end of the grinding drive mechanism 3, which can drive the screening mechanism 4 to vibrate. The vibration drive mechanism includes a rotating shaft 301 driven to rotate by an abrasive drive mechanism 3. The rotating shaft 301 is supported and limited by a fixed seat 302 on the ball mill. A vibration drive block 303 is provided at the end of the rotating shaft 301. A telescopic rod 304 is provided on one side plate. An abutment wheel 305 that is rolledly connected to the vibration drive block 303 is provided at the top of the telescopic rod 304. A spring 306 is sleeved on the telescopic rod 304. The vibration drive block 303 consists of two semi-circular blocks of different sizes. The smaller semi-circular block is coaxial with the rotating shaft 301, and the two semi-circular blocks are connected at one end.

[0041] Working principle of abrasive drive mechanism 3: After the abrasive drive mechanism 3 is powered on, it outputs torque to drive the ball mill to rotate around its own axis. The steel balls inside the ball mill collide and grind with the raw materials to achieve the grinding of the raw materials. At the same time, the abrasive drive mechanism 3 drives the coaxial rotating shaft 301 to rotate, and the vibration drive block 303 rotates synchronously with the rotating shaft 301. When most of the circular block contacts the abutting wheel 305, it pushes the telescopic rod 304 downward to compress the spring 306. When a small part of the circular block contacts the abutting wheel 305, the spring 306 releases its elastic force to push the telescopic rod 304 upward. This cycle causes the telescopic rod 304 to drive the side plate of the screening mechanism 4 to vibrate at high frequency. The abrasive drive mechanism 3 provides abrasive power to the ball mill, enabling the crushing and refining of raw materials. The vibration drive mechanism converts this abrasive power into the vibration force of the screening mechanism 4, improving screening efficiency and preventing raw materials from clogging the screen holes 602. Furthermore, there is no need to configure a separate vibration motor for screening, simplifying the equipment structure and reducing energy consumption. The "large and small semicircles" design of the vibration drive block 303 synchronizes the vibration frequency with the ball mill speed, ensuring that the abrasive and screening rhythms match and improving the overall process continuity.

[0042] When implementing the screening device for grinding and discharging raw materials for alumina production, the operator first pours the alumina raw material to be ground into the feeding mechanism 1. The feeding mechanism 1 conveys the raw material to the bottom guide trough 2 at a uniform speed through the conveyor belt or hopper. The raw material slides down the inclined guide trough 2 by gravity and enters the ball mill feed inlet smoothly. Then, the abrasive drive mechanism 3 on one side of the ball mill is started. The abrasive drive mechanism 3 outputs torque to drive the ball mill to rotate around its own axis. The ball mill uses the collision and grinding of steel balls and raw materials to crush the raw materials. On the other hand, it drives the coaxial rotating shaft 301 to rotate, so that the vibration drive block 303 composed of two semi-circular blocks of different sizes at the end of the rotating shaft 301 rotates synchronously. When the larger semi-circular block of the vibration drive block 303 contacts the abutting wheel 305 at the top of the telescopic rod 304 on the side plate of the screening mechanism 4, it pushes the telescopic rod 304 downward to compress the spring 306. When the smaller semi-circular block contacts the abutting wheel 305, the spring 306 releases its elastic force to push the telescopic rod 304 upward. This cycle drives the side plate of the screening mechanism 4 to vibrate at high frequency. The raw material ground by the ball mill falls from the discharge port into the discharge trough 401 of the screening mechanism 4. The cover 408 and dust cover 409 on the discharge trough 401 prevent dust from spreading. At this time, the electric telescopic rod 405 on the side plate is activated. Its telescopic end drives the bottom rod 404 of the bottom plate 403 at the hinge end of the screen plate assembly at the center to move up and down. The bottom rod 404 at the center drives the bottom rods 404 on both sides to move synchronously in opposite directions through the drive rods 406 with sliding grooves 407 at both ends. When moving upward, the screen plate assemblies on both sides are pulled and extended by the drive rod 406, and the central screen plate assembly is folded. The folded screen plate assembly conveys the material along the inclined direction to the extended screen plate assembly. The extended screen plate assembly screens the raw material under the action of vibration. When the bottom rod 404 at the center moves downward, the central screen plate assembly extends to screen, and the two sides are folded and conveyed. Fine material that meets the particle size requirements is discharged from the discharge plate of the discharge chute 401, and larger coarse material falls into the conveying chute 501 of the return material mechanism 5 on one side of the ball mill. Next, the drive motor of the return material mechanism 5 is started, which drives the spiral conveyor 502 in the conveying trough 501 to rotate. The blades of the spiral conveyor 502 push the coarse material along the conveying trough 501 towards the screening mechanism 6. During the conveying process, the cleaning mechanism 7 on the side rail 503 of the conveying trough 501 works synchronously with the movement of the spiral conveyor 502. The blades of the spiral conveyor 502 push the slider 701 of the cleaning mechanism 7 to move upward along the slide rail 503. The scraper 704 in the through groove 703 of the top frame 702, under the action of spring 709, remains in contact with the blades of the spiral conveyor 502, scraping off the material adhering to the blades. When the contact surface 705 at one end of the scraper 704 abuts against the top cover of the conveying trough 501, the cover pushes the scraper 704 to retract into the through groove 703, compressing spring 709. When the scraper 704 extension plate 710 moves downward under the action of gravity, after the scraper 704 separates from the screw conveyor 502, the cleaning mechanism 7 moves downward along the slide rail 503 under the action of gravity. When the limiting block 712 at the end of the scraper 711 contacts the abutting end 714 of the bottom support plate 713 of the conveying trough 501, the impact force causes the abutting rod 711 to reset, and the spring 709 pushes the scraper 704 back to its original position to complete one cleaning cycle. The spiral conveyor 502 transports the coarse material to the discharge trough 601 of the screening mechanism 2 6 connected to the top of the conveying trough 501. The coarse material slides down the inclined discharge trough 601. During the process, some fine material that is not fully screened in the first stage or is refined by friction falls into the bottom hopper 603 through the screen hole 602. The fine material in the hopper 603 is transported to the discharge trough 401 of the screening mechanism 1 4 through the guide pipe 604 and merges with the fine material screened in the first stage and is discharged. The coarse material that has not passed through the screen continues to slide down into the guide trough 2 of the feeding mechanism 1 and enters the ball mill for re-grinding along with the new raw material. This cycle achieves efficient grinding and precise screening of alumina raw materials.

[0043] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A screening device for abrasive grinding in alumina production, comprising a feeding mechanism (1) located at the feed inlet of a ball mill, the feeding mechanism (1) guiding alumina raw material into the ball mill for abrasion via a bottom guide trough (2), characterized in that: The ball mill outlet is equipped with a screening mechanism (4) for screening alumina raw materials after grinding. The screening mechanism (4) includes several screen plate assemblies that are hinged in sequence. Two adjacent screen plate assemblies include two screen plates (402) that are hinged to each other. The two adjacent screen plate assemblies can be extended and folded alternately. The extended screen plate assembly can screen alumina, and the folded screen plate assembly can transport alumina.

2. The screening device after abrasive processing in alumina production according to claim 1, characterized in that: The screening mechanism (4) also includes a discharge trough (401), which includes a discharge plate that is inclined to one side. Side plates are provided on both sides of the discharge plate, and several screen plate assemblies are located between the two side plates. The screen plate assemblies are driven by a drive mechanism located on the side plates to complete the extension and folding work. The screen plate assemblies are arranged on the side plates with an overall inclination.

3. The screening device after abrasive processing in alumina production according to claim 2, characterized in that: A vertically downward base plate (403) is provided at the bottom of the hinged end of the screen plate assembly located at the center and on both sides. A horizontally placed base rod (404) is provided at the bottom end of the base plate (403). The end of the base rod (404) passes through the side plate and can slide up and down on the side plate. The driving mechanism includes an electric telescopic rod (405) fixed to the side plate. The telescopic end of the electric telescopic rod (405) is fixed to the base rod (404) at the center. Several driving rods (406) are rotatably provided on the side plate. Both ends of the driving rod (406) are provided with a sliding groove (407). The end of the base rod (404) slides in the sliding groove (407).

4. The screening device after abrasive processing in alumina production according to claim 2, characterized in that: A cover (408) is hinged on the discharge chute (401). The cover (408) is located at the discharge port of the ball mill. A dust cover (409) is provided on one side of the cover (408). A return material mechanism (5) is provided on one side of the ball mill. The return material mechanism (5) can transport larger alumina particles after screening by the sieve plate (402) to the feed port of the ball mill. A screening mechanism (6) is provided between the return material mechanism (5) and the guide chute (2).

5. The screening device after abrasive processing in alumina production according to claim 4, characterized in that: The screening mechanism 2 (6) includes a discharge trough 2 (601) that connects the return material mechanism (5) and the guide trough (2). The discharge trough 2 (601) is provided with a screen hole (602) and a hopper (603) that is connected through the screen hole (602) is provided at the bottom of the discharge trough 2 (601). A guide pipe (604) is connected between the hopper (603) and the discharge trough 1 (401).

6. The screening device after abrasive processing in alumina production according to claim 5, characterized in that: The return material mechanism (5) includes a conveying trough (501), and a spiral conveying component (502) driven by a drive motor is provided in the conveying trough (501). The spiral conveying component (502) can convey alumina particles along the conveying trough (501). The top of the conveying trough (501) is connected to the discharge trough (601). A slide rail (503) is provided at the side end of the conveying trough (501). A cleaning mechanism (7) is slidably provided on the slide rail (503). The cleaning mechanism (7) moves up and down under the action of the spiral conveying component (502) and gravity. When the cleaning mechanism (7) moves upward, it can clean the spiral conveying component (502).

7. The screening device after abrasive processing in alumina production according to claim 6, characterized in that: The cleaning mechanism (7) includes a slider (701) that slides on a slide rail (503), a top frame (702) on the slider (701), a through groove (703) inside the top frame (702), a scraper (704) that slides inside the through groove (703), one end of the scraper (704) having an abutment surface (705) that abuts against the top of the conveying trough (501), and the other end of the scraper (704) abutting against the screw conveyor (502), and a slot (706) on the side wall of the top frame (702), with a guide rod (708) inside the slot (706). The end of the contact surface (705) is provided with an end block (707) that is slidably connected to the guide rod (708). The end block (707) is provided with a spring (709) sleeved on the guide rod (708). The bottom of the feed trough (501) is provided with a support plate (713). The support plate (713) is provided with an abutment end (714). The scraper (704) is provided with an extension plate (710). An abutment rod (711) is slidably inserted into the extension plate (710). The end of the abutment rod (711) is provided with a limiting block (712) that abuts against the abutment end (714).

8. The screening device after abrasive processing in alumina production according to claim 2, characterized in that: A grinding drive mechanism (3) that can drive the ball mill to rotate is provided on one side of the ball mill, and a vibration drive mechanism that can drive the screening mechanism (4) to vibrate is provided at the output end of the grinding drive mechanism (3). The vibration drive mechanism includes a rotating shaft (301) driven to rotate by an abrasive drive mechanism (3). The rotating shaft (301) is supported and limited by a fixed seat (302) on the ball mill. A vibration drive block (303) is provided at the end of the rotating shaft (301). A telescopic rod (304) is provided on one side plate. An abutment wheel (305) is provided at the top of the telescopic rod (304) and is rolledly connected to the vibration drive block (303). A spring (306) is sleeved on the telescopic rod (304).

9. The screening device after abrasive processing in alumina production according to claim 8, characterized in that: The vibration drive block (303) consists of two semi-circular blocks of different sizes. The smaller semi-circular block is coaxial with the rotating shaft (301), and the two semi-circular blocks of different sizes are connected at one end.

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