Circulating reflux type glass sand grinding multi-stage screening closed loop processing device

Abstract

The application discloses circulating reflux type glass sand grinding multi-stage screening closed loop processing device, mainly relates to glass sand grinding technical field, specifically includes slurry cylinder, cavity shell of loading grinding medium and material and carrying out filtration separation, slurry is distinguished through being additionally installed baffle on inner wall, separation cover is uniformly installed on the baffle, and the separation cover is conical cylinder and the inner wall is installed with the screen cylinder of slurry filtration sorting;The application is grinding, grading and screening and refluxing and crushing integrated in the same slurry cylinder, utilizes the dispersion grinding assembly of baffle separation, circumferential conical separation cover and screen cylinder cooperation rotating drum stacked wear-resistant cylinder sleeve and zirconium oxide bead, constructs " downward grinding-upward screening " strong internal circulation closed loop system, so that slurry repeatedly passes through grinding area in the cylinder until particle size reaches the standard, guarantees that the particle size distribution of finished product is concentrated, while external conveying equipment is saved, and the land occupation and energy consumption are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of glass sand grinding technology, specifically a circulating reflux glass sand grinding multi-stage screening closed-loop processing device. Background Technology

[0002] Glass sand, as an important industrial raw material, is widely used in glass products, casting, abrasive materials, building decoration and other fields. The fineness uniformity and particle size distribution directly determine the quality grade of the final product. The fine processing of glass sand usually adopts the wet grinding process, which involves mixing crushed glass particles with water to form a slurry, feeding it into grinding equipment for crushing and refining, and then classifying the particles by independent screening equipment to obtain a finished slurry that meets the particle size requirements.

[0003] However, the aforementioned segmented process of "grinding-conveying-screening" has revealed significant drawbacks in actual production. Because grinding and screening are performed in different equipment, the slurry must be transferred between the two via pipelines or conveying devices. This not only increases equipment footprint and infrastructure investment but also incurs additional energy consumption during transport and maintenance costs due to pipeline wear. More importantly: The screens of screening equipment are prone to clogging during long-term operation. Although the glass sand particles are initially refined after grinding, there are still some "critical particles" whose particle size is close to the screen hole size. These particles are easily stuck in the screen mesh during the screening process. At the same time, a small amount of coarse particles in the slurry that have not been sufficiently ground will gradually accumulate on the screen surface to form a material layer, resulting in a continuous reduction in the effective flow area and a significant decrease in screening efficiency over time. The root cause lies in the fact that grinding and screening are separated into two independent processes. The screening process lacks a direct material feedback loop with the grinding chamber. Once the screen is clogged, the trapped coarse particles cannot automatically return to the grinding area for further refining. Instead, they accumulate on the screen surface or are discharged with the rinsing water, resulting in the loss of some recyclable raw materials. Therefore, a solution is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a closed-loop processing device for multi-stage screening and grinding of circulating glass sand, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a circulating reflux glass sand grinding and multi-stage screening closed-loop processing device, comprising: The slurry cylinder is a chamber shell that loads grinding media and materials and filters and separates them. The slurry is separated by partitions installed on the inner wall. Separation hoods are evenly installed on the partitions. The separation hoods are conical and have screens installed on the inner wall for slurry filtration and sorting. The guide tube is located in the center of the partition. The main body consists of a thick tube in the middle and thin tubes that are radially connected. One end of the thin tube is connected to the separation hood. A rotating cylinder is movably connected to the inside of the guide tube. Drainage holes are evenly arranged on the bottom side of the partition. The dispersing and grinding assembly is set inside the rotating drum and works with the drum to guide and crush the slurry. It includes a rotating shaft, a stirring plate is mounted on the rotating shaft, a flow divider is mounted at the bottom of the stirring plate, and wear-resistant cylinder liners are stacked at the bottom of the flow divider. The gaps between the stacked wear-resistant cylinder liners are evenly filled with zirconia beads. As the rotating shaft rotates, the zirconia beads are struck by the tweezers welded on the wear-resistant cylinder liners, which, together with the outer rotating drum, cause the slurry to be crushed by impact.

[0006] The key objective of this section is to integrate grinding and screening into the same slurry drum, and to achieve multi-stage screening through the spatial layout of the rotating drum and the separation hood.

[0007] Furthermore, a drive assembly is installed on the top of the slurry cylinder. The drive assembly includes a motor that drives the rotation of the shaft and the rotation of the cylinder. The shaft and the cylinder are controlled independently. The cylinder is provided with a wear-resistant lining on the wear-resistant cylinder liner side.

[0008] Furthermore, a regulating valve is installed on the radial thin tube of the guiding pipe, and a toothed sleeve is provided at the valve stem of the regulating valve. A toothed shaft is slidably connected through the partition on the same side of the regulating valve. The teeth on the toothed shaft mesh with the toothed sleeve, and the regulating valve completes the connection control of the thin tube on the corresponding side of the guiding pipe by sliding axially through the toothed shaft.

[0009] Furthermore, a guide tube is fixedly connected to the rotating drum at the bottom of the partition. The guide tube is used to guide the flow of liquid in the slurry drum and is adapted to the rotation of the rotating drum and multiple sets of separation hoods.

[0010] Furthermore, stirring impellers adapted to the separation hood are evenly installed at the bottom of the slurry cylinder, which, together with the guide tube, complete the lifting of the sediment at the bottom of the slurry cylinder.

[0011] The key objective of this section is to achieve particle size classification of the slurry as it passes through the screen cylinder. Qualified fine particles pass through the screen and are discharged above the baffle, while coarse particles that do not pass through the screen are trapped inside the screen cylinder, achieving preliminary screening and laying the foundation for subsequent screen cylinder cleaning. The linkage control of the regulating valve and gear shaft enables selective reflux channel switching, allowing unscreened particles to automatically return to the grinding zone for re-crushing. At the same time, the synergy of the guide cylinder and stirring impeller maintains uniform slurry suspension and avoids sedimentation. The entire processing process forms a closed loop, significantly reducing material transfer losses, improving grinding efficiency and finished product particle size consistency, and significantly reducing screen clogging frequency. It is suitable for the efficient and refined processing of hard particles such as glass sand.

[0012] Furthermore, connecting pipes are respectively installed on the slurry cylinders located on both sides of the partition. The bottom connecting pipe is used for feeding, and the top connecting pipe is used for discharging the slurry.

[0013] The circulating reflux glass sand grinding and multi-stage screening method is as follows: The internal circulation continuous crushing method drives the agitator and wear-resistant cylinder liner to rotate through the rotating shaft, pushing the slurry to flow downward in the rotating drum. While completing the crushing process, it is remixed with the liquid in the slurry cylinder. At the same time, the rotating impeller pushes the mixed slurry through the screen cylinder outside the separation hood to complete the filtration and discharge operation. The external circulation screen cleaning process involves an increase in unscreened particles on the inner wall of the screen cylinder. The rotating drum drives the guide cylinder to complete the bottom connection of the single-sided separation hood. At the same time, the toothed shaft passively lifts the regulating valve on the contact guide pipe. At this time, the rotating agitator generates downward flowing liquid, which adsorbs the unscreened particles located on the outside of the separation hood and on the screen cylinder, and then re-crushes them.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates grinding, grading and screening, and reflux re-crushing into a single slurry cylinder. It utilizes partitions to separate upper and lower zones, and circumferentially arranged conical separation hoods and screen cylinders, along with a dispersing grinding assembly consisting of stacked wear-resistant cylinder liners and zirconia beads within the rotating cylinder. This constructs a strong internal circulation closed-loop system of "downward grinding—upward screening." The slurry repeatedly passes through the grinding zone within the cylinder until the particle size meets the standard before being discharged, ensuring the concentrated particle size distribution of the finished product and preventing the mixing of excessively coarse or fine particles. Simultaneously, it eliminates the need for external conveying equipment, significantly reducing floor space and energy consumption during transport. The grinding media is less prone to sedimentation, resulting in high energy utilization. It is particularly suitable for large-scale continuous fine processing of high-hardness materials such as glass sand.

[0015] 2. This invention also utilizes a guide tube that rotates with the rotating drum to orient and connect to the separation hood, and achieves automatic opening and closing of the corresponding side tube through the mechanical linkage of the gear shaft and the regulating valve. Without stopping the machine, the unscreened particles adsorbed on the inner wall of the screen cylinder and the outside of the separation hood are reversed and drawn back to the grinding zone for re-crushing, forming an external circulation online self-cleaning mechanism. This cleaning process does not require additional pump sets or manual intervention, and relies entirely on the power source of the grinding zone itself. The timing is staggered from the main process, which has minimal impact on production efficiency, significantly reduces the frequency of screen clogging and equipment downtime maintenance costs. Combined with the continuous lifting and anti-deposition effect of the stirring impeller on the bottom slurry, it ensures long-term operational stability and smooth discharge. The overall operating cost is significantly lower than that of the traditional segmented process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the circulating reflux glass sand grinding and multi-stage screening closed-loop processing device of the present invention; Figure 2 This is a schematic diagram of the installation structure of multiple sets of stirring impellers located at the bottom of the slurry cylinder and the corresponding drive system of the present invention; Figure 3This is a schematic diagram of the installation structure of the screen cylinders on both sides of the partition plate of the present invention; Figure 4 This is a schematic diagram of the overall structure of the dispersion and grinding assembly located inside the rotating drum according to the present invention; Figure 5 This is a schematic diagram of the flow guide tube located at the bottom of the rotating drum in this invention; Figure 6 This is a schematic diagram of the installation structure of the screen cylinder and the separation cover of the present invention; Figure 7 This is a schematic diagram of the zirconia bead installation structure located on the wear-resistant cylinder liner inside the rotating drum of the present invention.

[0017] In the diagram: 1. Slurry cylinder; 2. Drive assembly; 3. Baffle plate; 4. Agitator impeller; 5. Guide pipe; 6. Rotary drum; 7. Dispersion and grinding assembly; 701. Rotary shaft; 702. Agitator plate; 703. Flow divider; 704. Wear-resistant cylinder liner; 705. Zirconia beads; 8. Separation hood; 9. Screen cylinder; 10. Control valve; 11. Flow guide cylinder; 12. Gear shaft. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-7 The present invention provides a technical solution: Example 1: First, the common problems of glass sand grinding equipment are explained: In traditional methods, grinding and screening are usually carried out in different equipment. After grinding, the slurry needs to be transported to an independent screening machine through pipelines. This not only increases the equipment footprint and transportation energy consumption, but also makes the screen easy to be blocked by coarse particles, requiring frequent shutdowns for cleaning, resulting in low production efficiency. At the same time, the slurry in the grinding chamber is easy to deposit, and the particle distribution is uneven, affecting the consistency of the finished product particle size. This invention integrates grinding, grading and screening, and re-crushing in the same slurry cylinder 1 to construct a closed-loop processing system. The core structure includes a slurry cylinder 1, a partition 3, a guide pipe 5, a rotating cylinder 6, and a dispersing and grinding component 7. The slurry cylinder 1 serves as the outer shell of the cavity for loading the grinding media zirconia beads 705 and the glass mortar to be processed. The inner wall of the cylinder is equipped with a partition 3, which divides the cylinder into upper and lower regions. Multiple separation hoods 8 are evenly installed on the partition plate 3. The separation hood 8 is conical and has a screen 9 on its inner wall. This arrangement allows the slurry to be classified by particle size when it passes through the screen 9. The qualified fine material passes through the screen and enters the area above the partition plate 3, and is discharged through the top connecting pipe. The coarse particles that have not been screened are trapped below the partition plate 3 and in the gap between the separation hood 8 and the screen 9, thus achieving preliminary screening and avoiding over-grinding of qualified material. The guide pipe 5 is located in the center of the partition 3. Its main body consists of a thick pipe in the middle and thin pipes that are radially connected. One end of the thin pipe is connected to each of the separation hoods 8 to form a slurry return channel. A rotating drum 6 is movably connected to the inside of the guide tube 5. The rotating drum 6 is located on the bottom side of the partition 3 and has drainage holes evenly arranged to guide the ground slurry from the inside of the rotating drum 6 to the outside. The rotating drum 6 is driven by an independent motor and can rotate relative to the guide tube 5. It works with internal components to guide and disperse the slurry. The inner wall of the rotating drum 6 is lined with a wear-resistant lining to reduce the erosion and wear of high-speed slurry and extend its service life. The dispersion grinding assembly 7 is located inside the rotating drum 6 and includes a rotating shaft 701, an agitator 702, a flow divider 703, and stacked wear-resistant cylinder liners 704. The rotating shaft 701 is independently controlled by a motor in the top drive assembly 2 and does not interfere with the rotation of the rotating drum 6. A stirring plate 702 is mounted on the rotating shaft 701. A flow divider 703 is installed at the bottom of the stirring plate 702. Multiple layers of wear-resistant cylinder liners 704 are stacked at the bottom of the flow divider 703, and the gaps between the stacked wear-resistant cylinder liners 704 are evenly filled with zirconia beads 705. As the rotating shaft 701 rotates, the shovels welded on the wear-resistant cylinder liners 704 strike the zirconia beads 705 at high speed, forming a dense impact and shear force field. When the slurry passes through this area, it is subjected to strong crushing action. With the obstruction of the inner wall of the outer rotating cylinder 6, the slurry is forced to be repeatedly impacted, which greatly improves the crushing efficiency. Compared with traditional ball mills, this structure actively drives the grinding media through the shovels, resulting in higher energy density and less grinding media deposition. It is suitable for high-hardness materials such as glass sand.

[0020] Example 2: This example supplements the specific implementation process of Example 1, focusing on the installation and debugging of each component, and the collaborative working mode of internal circulation crushing and external circulation screen cleaning; First, the slurry cylinder 1 is vertically fixed to the working base to ensure the cylinder is level. The partition plate 3 is horizontally welded to the middle of the inner wall of the slurry cylinder 1. The mounting holes reserved on the partition plate 3 are used to fix the separation hood 8. Each separation hood 8 is evenly distributed around the partition plate 3 and adopts a conical structure with the conical opening facing down. The inner wall is fixed with a screen cylinder 9 through a slot. The mesh number of the screen cylinder 9 is selected according to the target finished product particle size. The conical design of the separation hood 8 serves as a guide, reducing particle accumulation on the screen surface and extending the effective screening time. The guide tube 5 passes through the center of the partition 3, and the number of its radial thin tubes is the same as that of the separation cover 8. The end of the thin tube is connected to the top of the separation cover 8 through a sealing joint. A regulating valve 10 is installed on the thin tube. The valve stem of the regulating valve 10 is provided with a toothed sleeve for controlling the on and off. A toothed shaft 12 is slidably connected through the partition 3 on the same side. The teeth on the toothed shaft 12 mesh with the toothed sleeve. The valve stem can be rotated by sliding the toothed shaft 12 axially to open or close the corresponding thin tube. This linkage mechanism has a compact structure and does not require additional solenoid valves or pneumatic components. It can complete precise switching by mechanical meshing, which is highly reliable and inexpensive. The rotating drum 6 is coaxially sleeved inside the guide tube 5, and a sliding sealing ring is provided between the two to prevent slurry leakage. The bottom of the rotating drum 6 extends out of the lower port of the guide tube 5, and drainage holes are evenly opened in the circumference of the extended section. The bottom of the rotating drum 6 is also connected to and fixed with a guide tube 11. The guide tube 11 rotates synchronously with the rotating drum 6, and its outlet can be aligned with the bottom opening of a certain separation hood 8 to guide the flow of slurry. The bottom of the slurry drum 1 is evenly equipped with stirring impellers 4 corresponding to the number of separation hoods 8. The stirring impellers 4 are driven by a bottom motor. Regarding the installation of the dispersion grinding assembly 7: Insert the rotating shaft 701 from the top of the slurry cylinder 1, pass through the guide pipe 5 and extend into the interior of the rotating cylinder 6. The stirring plate 702 is fixed in the middle of the rotating shaft 701, and the flow divider 703 is fixed below the stirring plate 702. Both rotate together with the rotating shaft 701. The wear-resistant cylinder liner 704 is mounted on the fixed rod at the bottom of the flow divider 703 in a multi-layer stacked manner. The wear-resistant cylinder liner 704 is separated by a gasket to maintain a uniform gap. Zirconia beads 705 are filled in the gap. Multiple paddles are welded to the outer periphery of the wear-resistant cylinder liner 704. When the paddles rotate, they strike the zirconia beads 705 and push them to roll in the gap, forming a three-dimensional motion trajectory, effectively avoiding dead angles and ensuring that all slurry particles are fully impacted. After installation, conduct a no-load test run to check whether each rotating part is concentric and whether there are any abnormal noises. Adjust each seal to a leak-free state, inject clean water into the slurry cylinder 1, start the rotating shaft 701 and the stirring impeller 4, observe whether the slurry flows smoothly and whether the screen cylinder 9 leaks. After confirming that there are no problems, drain the clean water and prepare for formal processing. During normal grinding operations, the glass sand slurry to be processed is continuously fed into the slurry cylinder 1 through the connecting pipe at the bottom. At the same time, the drive motors of the rotating shaft 701, rotating cylinder 6, and stirring impeller 4 are turned on. The rotating shaft 701 rotates at high speed, driving the stirring plate 702 to generate a downward pushing axial force. The slurry is sucked into the rotating cylinder 6 and evenly distributed to the gaps of each layer of wear-resistant cylinder liner 704 through the distribution cylinder 703. The pavers on the wear-resistant cylinder liner 704 strike the zirconia beads 705 at high speed. Strong squeezing, impact, and shearing effects are generated between the zirconia beads 705 and between the zirconia beads 705 and the inner wall of the rotating cylinder 6, which crushes the glass sand particles into smaller particle sizes. The crushed slurry is discharged from the drain hole at the bottom of the rotating cylinder 6 and mixed with the liquid at the bottom of the slurry cylinder 1. At the same time, the impeller 4 rotates, generating an upward thrusting effect, which lifts the bottom mixed slurry and spreads it to the surroundings. During the ascent, the slurry encounters the separation hood 8 and passes through the screen cylinder 9 outside the separation hood 8 under pressure. The qualified fine material passes through the screen and enters the clear liquid zone above the partition 3. Finally, it is discharged and collected through the top connecting pipe as the finished slurry. Unscreened coarse particles are trapped on the inner wall of the screen cylinder 9 or settle to the bottom of the slurry cylinder 1, waiting for the next cycle. As the rotating cylinder 6 continuously discharges liquid and the stirring impeller 4 continuously rises, a strong internal circulation flow of "downward grinding and upward screening" is formed in the entire slurry cylinder 1. The particles pass through the grinding zone repeatedly in the cylinder until the particle size meets the standard before being discharged, ensuring the concentration of the particle size distribution of the finished product and avoiding the mixing of excessively coarse or excessively fine particles. The advantages of this internal circulation mode are: grinding and screening are carried out simultaneously, no external conveying equipment is required, energy consumption is low, and the slurry is always kept in a suspended state, so zirconia beads 705 and coarse particles will not settle at the bottom, the grinding efficiency is stable, and at the same time, the screening process is carried out in liquid flow, the screen is not easily clogged, and a high flow area is maintained. As the running time increases, coarse particles that have not passed through the screen will gradually accumulate on the inner wall of the screen cylinder 9. Especially when the feed concentration is high or the particle hardness is high, some particles will get stuck in the screen holes, resulting in a decrease in the effective filtration area and a slowdown in the discharge speed. At this time, the system will automatically switch to the external circulation cleaning mode without stopping the machine. The specific control process is as follows: Under the drive of the top motor, the rotating drum 6 drives the guide drum 11 to rotate, so that its outlet is aligned with the bottom of a separation hood 8 that needs to be cleaned. After the guide drum 11 rotates to the target position, its port forms a docking or near docking state with the bottom of the separation hood 8. At the same time, due to the rotation of the guide drum 11, its tube wall will push the toothed shaft 12 located on the partition plate 3 to slide upward. When the toothed shaft 12 rises, its teeth mesh with the toothed sleeve of the regulating valve 10, driving the valve stem to rotate and opening the regulating valve 10 on the radial thin tube of the guide tube 5 corresponding to the separation hood 8, so that the thin tube is connected to the central thick tube of the guide tube 5. At this time, the stirring plate 702 continues to rotate, generating a downward suction force, forming a negative pressure inside the guide pipe 5. This negative pressure is transmitted to the inside of the separation hood 8 through the opened thin pipe, drawing the unscreened particles adsorbed on the inner wall of the screen cylinder 9 and the outside of the separation hood 8, along with some liquid, into the guide pipe 5. The particles then flow back down along the central coarse pipe to the grinding zone inside the rotating cylinder 6. The coarse particles re-enter the gap of the wear-resistant cylinder liner 704 and are once again impacted and crushed by the zirconia beads 705, realizing the external circulation closed loop of "blockage - backflow - re-crushing". During the cleaning process, the stirring impeller 4 continues to run, ensuring that the bottom slurry continues to flow upward, assisting in flushing the outer wall of the separation hood 8 and sending the loosened attachments into the return path. After cleaning one side is completed, the rotating drum 6 continues to rotate to the next separation hood 8, repeating the above actions until all separation hoods 8 are cleaned. The entire cleaning process only takes a few minutes and requires no manual intervention, without interrupting the main grinding process, which significantly improves the continuous running time of the equipment. This external circulation mode utilizes the power source of the grinding zone itself, without adding an additional pump set, saving energy and having a simple structure. At the same time, the cleaning action and the grinding action are staggered in sequence, which has minimal impact on the main process flow. The internal and external circulation modes of this invention can be flexibly switched or combined according to actual working conditions. Under the condition that the feed particle size is uniform and the concentration is moderate, the internal circulation mode can be run for a long time to maintain high output. When a decrease in discharge flow or an increase in screen pressure is detected, external circulation cleaning is automatically triggered to restore screening capacity. Both modes share the same grinding power and screening components, maximizing resource utilization. The rotational speed of the shaft 701, the rotational angle of the drum 6, and the rotational speed of the impeller 4 can all be adjusted independently to adapt to the requirements of different material hardness and different target particle size. For example, for harder glass sand raw materials, the rotational speed of the shaft 701 can be appropriately increased to enhance the impact force; for products with higher fineness requirements, the feed rate can be reduced and the number of cycles can be increased. The number of stacked layers of the wear-resistant cylinder liner 704 and the filling amount of zirconia beads 705 can also be adjusted according to the grinding chamber volume and output, which is highly flexible. In summary, by integrating the grinding zone, screening zone, and reflux channel into the same cylinder, multi-stage crushing, grading, and reflux reprocessing of materials can be achieved in a closed space, significantly reducing the equipment footprint and intermediate transfer links. The synergy between the guide cylinder 11 and the stirring impeller 4 maintains the dynamic balance of the slurry and prevents sedimentation. The mechanical linkage between the gear shaft 12 and the regulating valve 10 enables online directional backwashing of the screen. Meanwhile, the internal circulation continuous crushing ensures the stability of the finished product particle size, and the external circulation cleaning ensures the reliability of long-term operation. The overall energy consumption and operating cost are significantly lower than the traditional segmented process, making it particularly suitable for large-scale continuous fine processing of hard materials such as glass sand.

[0021] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A circulating reflux type glass sand grinding and multi-stage screening closed-loop processing device, characterized in that, include: The slurry cylinder (1) is a cavity shell that loads grinding media and materials and performs filtration and separation. The slurry is separated by adding a partition (3) on the inner wall. A separation hood (8) is evenly installed on the partition (3). The separation hood (8) is conical and has a slurry filtration and sorting screen cylinder (9) installed on the inner wall. The guide tube (5) is set in the center of the partition (3). The main body consists of a thick tube in the middle and thin tubes that are radially connected. One end of the thin tube is connected to the separation cover (8). A rotating cylinder (6) is movably connected to the inside of the guide tube (5). The rotating cylinder (6) is located at the bottom side of the partition (3) and has drainage holes evenly arranged. The dispersion grinding component (7) is set inside the rotating drum (6) and works with the rotating drum (6) to guide and crush the slurry. It includes a rotating shaft (701), a stirring plate (702) is fitted on the rotating shaft (701), a flow divider (703) is installed at the bottom of the stirring plate (702), and wear-resistant cylinder liners (704) are stacked at the bottom of the flow divider (703). The gaps between the stacked wear-resistant cylinder liners (704) are evenly filled with zirconia beads (705). As the rotating shaft (701) rotates, the paddles welded on the wear-resistant cylinder liners (704) strike the zirconia beads (705) and work with the outer rotating drum (6) to crush the slurry.

2. The circulating reflux glass sand grinding and multi-stage screening closed-loop processing device according to claim 1, characterized in that, The top of the slurry cylinder (1) is equipped with a drive assembly (2), which includes a motor that drives the rotation of the shaft (701) and the rotation of the drum (6). The shaft (701) and the drum (6) are controlled independently. The drum (6) is provided with a wear-resistant lining on the side of the wear-resistant cylinder liner (704).

3. The circulating reflux glass sand grinding and multi-stage screening closed-loop processing device according to claim 2, characterized in that, A regulating valve (10) is installed on the radial thin tube of the guiding pipe (5). A toothed sleeve is provided at the valve stem of the regulating valve (10). A toothed shaft (12) is slidably connected through the partition (3) on the same side of the regulating valve (10). The teeth on the toothed shaft (12) mesh with the toothed sleeve, and the regulating valve (10) controls the connection of the corresponding thin tube of the guiding pipe (5) by sliding axially through the toothed shaft (12).

4. The circulating reflux glass sand grinding and multi-stage screening closed-loop processing device according to claim 3, characterized in that, A guide tube (11) is fixedly connected to the rotating drum (6) at the bottom of the partition (3). The guide tube (11) is used to guide the flow of liquid in the slurry cylinder (1) and is compatible with the rotation of the rotating drum (6) and multiple sets of separation hoods (8).

5. The circulating reflux glass sand grinding and multi-stage screening closed-loop processing device according to claim 4, characterized in that, The bottom of the slurry cylinder (1) is uniformly equipped with stirring impellers (4) that are compatible with the separation hood (8), which, together with the guide tube (11), complete the lifting of the sediment at the bottom of the slurry cylinder (1).

6. The circulating reflux glass sand grinding and multi-stage screening closed-loop processing device according to claim 5, characterized in that, Connecting pipes are provided on the slurry cylinders (1) located on both sides of the partition (3). The bottom connecting pipe is used for feeding, and the top connecting pipe is used for slurry discharge.

7. The circulating reflux glass sand grinding and multi-stage screening closed-loop processing device according to claim 6, characterized in that, The circulating reflux glass sand grinding and multi-stage screening method is as follows: The internal circulation continuous crushing method drives the agitator (702) and wear-resistant cylinder liner (704) to rotate through the rotating shaft (701), pushing the slurry to flow downward in the rotating drum (6). While completing the crushing process, it is remixed with the liquid in the slurry cylinder (1). At the same time, the rotating impeller (4) pushes the mixed slurry out through the screen cylinder (9) outside the separation hood (8) to complete the filtration and discharge operation. During the external circulation screen cleaning, as the number of unscreened particles on the inner wall of the screen cylinder (9) increases, the rotating drum (6) drives the guide cylinder (11) to complete the bottom connection of the single-sided separation hood (8). At the same time, the regulating valve (10) on the contact guide pipe (5) is passively lifted by the gear shaft (12). At this time, the downward flow liquid is generated by the rotation of the agitator (702), which adsorbs the unscreened particles located on the outside of the separation hood (8) and the screen cylinder (9) and re-crushes them.

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