Preparation process and preparation device of composite flexible fine grinding sand roll

Abstract

The present application belongs to abrasive tool preparation technical field, more particularly to a kind of preparation device of composite flexible fine grinding sand roll, including conveying frame, the top inner side of conveying frame is provided with conveyor belt, and the conveyor belt is used to convey the substrate to be daubed;The top of conveying frame is provided with daubing mechanism, and conveying daubing mechanism is coated with abrasive layer on substrate;The two ends of conveying daubing mechanism are provided with longitudinal adjusting mechanism, and the longitudinal adjusting mechanism is used to adjust the height of daubing mechanism;The two sides of daubing mechanism are provided with transverse adjusting mechanism;The bottom of conveyor belt is provided with backflow mechanism, and the backflow mechanism is used to collect overflowed abrasive layer.The device contains driving roller, driven roller and special daubing and adjusting mechanism, to ensure that abrasive layer mixture can be evenly and effectively covered on substrate;In addition, the present application realizes the accurate control of abrasive layer thickness by precise height and spacing adjusting mechanism.

Description

Technical Field

[0001] This invention belongs to the field of abrasive preparation technology, specifically relating to a preparation process and apparatus for composite flexible fine grinding sand rolls. Background Technology

[0002] Fine abrasive rolls are widely used in many industrial fields, such as metal processing, wood processing, and plastics processing. Currently, the preparation of abrasive rolls typically relies on uniformly applying an abrasive coating to a flexible substrate. In existing preparation methods, the uniformity and thickness control of the abrasive layer are the core technical challenges. Commonly used methods include roller coating and spray coating, but these methods have certain limitations in terms of coating uniformity, material utilization, and production efficiency.

[0003] The main problems existing in the prior art include: 1. Uneven application of the abrasive layer mixture results in unsatisfactory abrasive roll grinding effect.

[0004] 2. The thickness of the grinding layer cannot be effectively controlled, affecting the performance of the abrasive roll.

[0005] 3. The low utilization rate of the grinding layer material results in a waste of raw materials.

[0006] 4. The preparation process is complex, which affects production efficiency. Summary of the Invention

[0007] To address the problems existing in the prior art, the present invention aims to provide a manufacturing process and apparatus for composite flexible fine grinding sand rolls. Through a precise height and spacing adjustment mechanism, accurate control of the grinding layer thickness is achieved. Simultaneously, the apparatus incorporates an effective material recycling system to reduce raw material waste and improve production efficiency.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A device for preparing composite flexible fine grinding sand rolls includes a conveyor frame, wherein a conveyor belt is provided on the inner side of the top of the conveyor frame, and the conveyor belt is used to transport the substrate to be coated. A coating mechanism is installed at the top of the conveyor frame, which applies the abrasive layer to the substrate. The two ends of the conveying and coating mechanism are provided with longitudinal adjustment mechanisms, which are used to adjust the height of the coating mechanism; The coating mechanism is provided with lateral adjustment mechanisms on both sides; The bottom of the conveyor belt is equipped with a return mechanism, which is used to collect the overflowing grinding layer.

[0009] Furthermore, the coating mechanism includes a drive roller, a first driven roller, and a second driven roller, with the drive roller located between the first driven roller and the second driven roller; One end of the drive roller is provided with a first motor for driving the drive roller to rotate. Furthermore, a feeding pipe is provided at the other end of the drive roller, and the feeding pipe is located above the drive roller and the first driven roller.

[0010] Furthermore, a telescopic tube is movably inserted into one end of the feeding pipe, and an elbow is connected to one end of the telescopic tube.

[0011] Furthermore, a crossbar is provided above the second driven roller, and a scraper is installed on the crossbar.

[0012] Furthermore, the longitudinal adjustment mechanism includes a first connecting rod, with a drive shaft provided on both sides of the first connecting rod. A positioning seat is mounted on the drive shaft, and a threaded rod that cooperates with the drive shaft is mounted on the positioning seat. The top of the threaded rod is connected to a connecting seat, one side of the connecting seat is connected to a lifting platform, the side of the lifting platform is provided with a track, one end of the drive shaft is provided with a second motor, and the other end of the drive shaft is equipped with a sprocket.

[0013] Furthermore, both the positioning seat and the track are fixedly installed on both sides of the conveyor frame; The rotation of the drive shaft can cause the threaded rod to move up and down.

[0014] Furthermore, the lateral adjustment mechanism includes a fixed plate, a slide block slidably connected to the side of the fixed plate, a pull rod connected to one end of the slide block, a reversing seat provided at the other end of the pull rod, a second connecting rod mounted on the reversing seat, and a third motor for driving the second connecting rod to rotate mounted on the reversing seat on one side.

[0015] Furthermore, the return mechanism includes a receiving component located below both sides of the conveyor belt. A material pipe is provided at the bottom of the receiving component, and a collecting pipe is provided at the bottom of the material pipe. The collecting pipe is inclined, and a drain hole is provided through one end of the collecting pipe.

[0016] Furthermore, a mounting plate is fixedly connected to the top of the lifting platform, and the top of the mounting plate and the bottom of the fixed plate are connected to each other.

[0017] The preparation process is as follows: Step 1 Prepare the substrate: Select an appropriate substrate, such as paper, cloth or other suitable flexible material, and ensure that its surface is clean and flat; Prepare the abrasive mixture: Prepare an appropriate amount of abrasive particles and binder mixture according to the required abrasive effect.

[0018] Step 2 Place the substrate on the conveyor belt and start the conveyor to transport the substrate to the coating mechanism; The grinding layer mixture is conveyed between the drive roller and the driven roller through the feed pipe and the telescopic pipe; The first motor of the coating mechanism drives the drive roller to rotate, thereby making the abrasive layer mixture evenly distributed on the substrate through the action of the drive roller; The thickness and uniformity of the grinding layer mixture are adjusted by the scraper on the crossbar.

[0019] Step 3 The height of the coating mechanism can be adjusted using a longitudinal adjustment mechanism to accommodate substrates and abrasive layers of different thicknesses. The gap between the drive roller and the driven roller is adjusted using a lateral adjustment mechanism to control the thickness and uniformity of the grinding layer; Step 4 The reflux mechanism in the device collects the overflow of the grinding layer mixture, guides the overflow to the drain hole through the receiving element, material pipe and collecting pipe, and then recovers it to the collection bin for secondary use.

[0020] Compared with the prior art, the beneficial effects of the present invention are: The coating mechanism, comprising a combination of drive rollers, driven rollers, a feed tube, and a telescopic tube, ensures uniform application of the abrasive layer mixture to the substrate. By precisely controlling the mixture supply rate and the scraper pressure, uniform distribution and precise control of the abrasive layer thickness are achieved, significantly improving the uniformity and coating efficiency. This not only improves the quality of the abrasive rolls but also effectively reduces material waste.

[0021] The design of the longitudinal and lateral adjustment mechanisms allows the device to quickly and accurately adjust the height of the coating mechanism and the distance between the drive roller and the driven roller. This adjustment mechanism enables the equipment to adapt to substrates of different thicknesses and abrasive layer requirements, increasing the equipment's adaptability and flexibility.

[0022] The reflux mechanism in this invention is designed to effectively recover the overflow of the grinding layer mixture and reduce raw material waste through secondary utilization. This not only reduces costs but also meets the requirements of environmental protection and sustainable development.

[0023] Compared to traditional methods for preparing grinding sand rolls, the equipment design of this invention simplifies the operation process and improves production efficiency. Simultaneously, maintenance and cleaning ensure the long-term stable operation of the equipment, reducing downtime and further enhancing production efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the coating mechanism of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the coating mechanism of the present invention. Figure 2 ; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the longitudinal adjustment mechanism of the present invention; Figure 6 This is a schematic diagram of the lateral adjustment mechanism of the present invention; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the reflux mechanism of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the reflux mechanism of the present invention. Figure 2 .

[0025] The attached diagram lists the components represented by each number as follows: 1. Conveyor frame; 11. Conveyor belt; 2. Application mechanism; 21. Drive roller; 22. First driven roller; 23. Second driven roller; 231. Crossbar; 232. Scraper; 233. First motor; 24. Feeding pipe; 241. Telescopic pipe; 242. Elbow; 3. Longitudinal adjustment mechanism; 31. Positioning seat; 32. Threaded rod; 33. Connecting seat; 34. Lifting platform; 341. Mounting plate; 35. Rail; 36. First connecting rod; 361. Drive shaft; 362. Sprocket; 37. Second motor; 4. Lateral adjustment mechanism; 41. Fixed plate; 42. Slide; 43. Tie rod; 44. Directional seat; 45. Second connecting rod; 46. Third motor; 5. Reflux mechanism; 51. Flow receiving component; 52. Material pipe; 53. Collector pipe; 531. Drain hole. Implementation

[0026] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0027] See Figure 1-9A device for preparing composite flexible fine grinding sand rolls includes a conveyor frame 1, and a conveyor belt 11 is provided on the inner side of the top of the conveyor frame 1. The conveyor belt 11 is used to transport the substrate to be coated. As mentioned in the background art, uniformly coating the grinding layer is the key to preparing high-quality fine grinding sand rolls. Therefore, this device uses the conveyor belt 11 to stably transport the substrate to the coating area to ensure the continuity and uniformity of the coating process. The top of the conveyor frame 1 is equipped with a coating mechanism 2, which coats the abrasive layer onto the substrate. The key design feature of the coating mechanism 2 is its ability to precisely control the thickness of the abrasive layer and coat it evenly. The two ends of the coating mechanism 2 are provided with longitudinal adjustment mechanisms 3, which are used to adjust the height of the coating mechanism 2. By adjusting the height of the coating mechanism 2, the thickness of the grinding layer can be flexibly adjusted according to different substrates and grinding requirements, thereby improving the applicability of the device and the grinding effect. The coating mechanism 2 is provided with lateral adjustment mechanisms 4 on both sides; the lateral adjustment mechanisms 4 can further optimize the coating process and ensure the uniform distribution of the grinding layer on the substrate, thereby meeting the requirements of high-precision grinding. The bottom of the conveyor belt 11 is provided with a return mechanism 5, which is used to collect the overflow of the grinding layer. This design reflects the need to improve material utilization mentioned in the background art. By recycling and reusing the overflow of the grinding layer, material waste is reduced and resource efficiency is improved.

[0028] See Figure 1-4 The coating mechanism 2 includes a drive roller 21, a first driven roller 22, and a second driven roller 23. The drive roller 21 is located between the first driven roller 22 and the second driven roller 23. This design allows the polishing layer to be evenly distributed when passing through the drive roller 21 and the driven rollers 22 and 23, thereby ensuring the uniform coating of the polishing layer on the substrate. One end of the drive roller 21 is provided with a first motor 233 for driving the drive roller 21 to rotate; the introduction of the motor 233 is to ensure the stable and continuous operation of the drive roller 21, thereby achieving uniform distribution and application of the grinding layer; Furthermore, the other end of the drive roller 21 is provided with a feed pipe 24, which is located above the drive roller 21 and the first driven roller 22. The feed pipe 24 is designed to ensure that the grinding layer mixture can be smoothly and accurately delivered to the coating area.

[0029] See Figure 2-4 One end of the feeding pipe 24 is movably connected to a telescopic pipe 241, and one end of the telescopic pipe 241 is connected to an elbow 242. The design of the telescopic pipe 241 and the elbow 242 enables the grinding layer mixture to be introduced into the coating area more accurately and flexibly, further improving the coating accuracy and uniformity. See Figure 2-4A crossbar 231 is provided above the second driven roller 23, and a scraper 232 is installed on the crossbar 231. The scraper 232 is provided to remove excess abrasive layer on the second driven roller 23, so as to ensure that the abrasive layer applied to the substrate has a consistent thickness and quality.

[0030] See Figure 5-7 The longitudinal adjustment mechanism 3 includes a first connecting rod 36, with a drive shaft 361 on each side of the first connecting rod 36. A positioning seat 31 is mounted on the drive shaft 361, and a threaded rod 32 that cooperates with the drive shaft 361 is mounted on the positioning seat 31. A connecting seat 33 is connected to the top of the threaded rod 32, and a lifting platform 34 is connected to one side of the connecting seat 33. A track 35 is provided on the side of the lifting platform 34. A second motor 37 is provided at one end of the drive shaft 361, and a sprocket 362 is mounted on the other end of the drive shaft 361. This series of components is designed to achieve precise height adjustment to adapt to substrates of different thicknesses and grinding requirements, thereby improving the adaptability and grinding effect of the device.

[0031] See Figure 5-7 The positioning seat 31 and the track 35 are both fixedly installed on both sides of the conveyor frame 1; the rotation of the drive shaft 361 can drive the threaded rod 32 to move up and down; this design enables the longitudinal adjustment mechanism 3 to stably and accurately adjust the height of the coating mechanism 2 to meet different grinding requirements.

[0032] See Figure 6-7 The lateral adjustment mechanism 4 includes a fixed plate 41, a slide block 42 slidably connected to the side of the fixed plate 41, a pull rod 43 connected to one end of the slide block 42, a reversing seat 44 provided at the other end of the pull rod 43, a second connecting rod 45 installed on the reversing seat 44, and a third motor 46 for driving the second connecting rod 45 to rotate installed on the reversing seat 44 on one side; this complex lateral adjustment mechanism design is to achieve precise control of the coating thickness, so that the grinding layer can be evenly covered on the substrate.

[0033] See Figure 8-9 The return mechanism 5 includes a receiving element 51, which is located below both sides of the conveyor belt 11. A material pipe 52 is provided at the bottom of the receiving element 51, and a collecting pipe 53 is provided at the bottom of the material pipe 52. The collecting pipe 53 is inclined, and a drain hole 531 is opened through one end of the collecting pipe 53. The design of the return mechanism 5 reflects the concept of material recycling and secondary utilization mentioned in the background art. By recycling the overflowing grinding layer, waste is reduced and material utilization is improved.

[0034] See Figure 5-7A mounting plate 341 is fixedly connected to the top of the lifting platform 34; the top of the mounting plate 341 and the bottom of the fixed plate 41 are connected to each other to form a stable structure. This connection method not only ensures the stability of the coating mechanism 2, but also allows for precise control of the height of the coating mechanism 2 through the longitudinal adjustment mechanism 3. The lifting platform 34 is lifted and lowered by the interaction between the drive shaft 361 driven by the second motor 37 and the sprocket 362 on it and the threaded rod 32, thereby adjusting the height of the coating mechanism 2 to adapt to substrates of different thicknesses. In addition, this connection method is also conducive to the rapid adjustment of the coating mechanism 2 to adapt to the coating requirements of different grinding layer mixtures, effectively improving the uniformity of the grinding layer and the coating efficiency, while reducing material waste.

[0035] Preparation process of composite flexible fine grinding sand roll 1. Material preparation: - Substrate selection and treatment: Select a flexible substrate with a width of 500-1000 mm and a thickness of 0.5-1.5 mm. Ensure that the surface cleanliness of the substrate meets industrial standards and that the dryness is controlled within 5-10%.

[0036] - Preparation of the abrasive mixture: Mix the abrasive particles and binder in a mass ratio of 1:3. The particle size of the abrasive particles is controlled within the range of 100-500 mesh to meet different abrasive requirements.

[0037] 2. Application process: - Conveying and positioning: The substrate is conveyed through the conveyor belt 11 at a speed of 0.5-2 meters per minute.

[0038] - Mixture delivery and application: The supply rate of the abrasive layer mixture is controlled at 10-20 liters per hour to ensure uniform coating.

[0039] - Thickness and uniformity control: The pressure of the scraper 232 is adjusted to 5-10 Newtons to control the uniform distribution and thickness of the grinding layer.

[0040] 3. Precise adjustment: - Height adjustment: The height adjustment range of the longitudinal adjustment mechanism 3 is 0-50 mm to accommodate substrates of different thicknesses.

[0041] - Spacing adjustment: The spacing between the drive roller 21 and the driven rollers 22 and 23 can be adjusted from 1 to 5 mm to achieve precise application of abrasive layers of different thicknesses.

[0042] 4. Recycling and Reuse: - Overflow recovery: The reflux mechanism 5 is designed to recover at least 95% of the overflow grinding layer mixture to minimize waste.

[0043] - Secondary use of materials: The recycled grinding layer mixture can be reused after being screened and filtered to remove impurities.

[0044] 5. Equipment maintenance and quality control: - Cleaning and Inspection: Clean and maintain the equipment every 8 hours of operation to maintain equipment performance and product quality.

[0045] - Quality control: Quality inspection of the prepared fine grinding sand rolls, including thickness tolerance of ±0.05 mm, and the uniformity inspection standard of the grinding layer is no more than 3 defects per square meter.

[0046] The working principle of this invention is as follows: When in use, the mixture of grinding layers is conveyed into the telescopic tube 241 through the feeding pipe 24 and discharged through the elbow 242 located at one end of the telescopic tube 241; the discharged mixture will fall between the drive roller 21 and the first driven roller 22. Driven by the first motor 233, the drive roller 21 will rotate. The rotation of the drive roller 21 will in turn drive the first driven roller 22 and the second driven roller 23 to work together. Through the cooperation of the drive roller 21, the first driven roller 22 and the second driven roller 23, the grinding layer mixture can be evenly covered on the first driven roller 22 and the second driven roller 23. When the substrate on the conveyor belt 11 passes under the coating mechanism 2, the first driven roller 22 and the second driven roller 23 can come into contact with the substrate under the control of the longitudinal adjustment mechanism 3, so as to evenly coat the abrasive coating mixture onto the substrate. During the rotation of the drive roller 21, the first driven roller 22, and the second driven roller 23, the mixture of the grinding layer will overflow from both ends. The overflowing mixture will fall into the receiving part 51 and flow into the collecting pipe 53 through the material pipe 52 located at the bottom of the receiving part 51. Finally, it will be discharged through the drain hole 531. At this time, a collection bin can be placed below the drain hole 531 to collect the overflowing grinding layer mixture. The collected mixture is not contaminated, so it can be reused, which can reduce the waste of grinding layer raw materials.

[0047] When adjusting the height of the first driven roller 22 and the second driven roller 23, the second motor 37 can drive the first connecting rod 36 to rotate, which in turn drives the drive shafts 361 at both ends of the first connecting rod 36 to rotate synchronously. The rotation of the drive shafts 361 will drive the threaded rod 32 to perform lifting and lowering operations. The cooperation between the drive shaft 361 and the threaded rod 32 can be a worm gear and worm or a gear and rack. The lateral adjustment mechanism 4 can synchronously adjust the distance between the first driven roller 22, the second driven roller 23 and the drive roller 21; under the drive of the third motor 46, the second connecting rod 45 will be rotated, and the rotation of the second connecting rod 45 can adjust the extension length of the pull rod 43. The second connecting rod 45 and the pull rod 43 can be connected by a worm gear and a turbine or a gear and a rack. When the distance between the drive roller 21, the first driven roller 22, and the second driven roller 23 is adjusted, coatings of different thicknesses can be applied to the first driven roller 22 and the second driven roller 23, thereby enabling the application of polishing layers of different thicknesses onto the substrate.

[0048] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A device for preparing a composite flexible fine abrasive sanding roll comprising a conveyor frame (1), characterized in that: A conveyor belt (11) is provided on the top inner side of the conveyor frame (1), and the conveyor belt (11) is used to convey the substrate to be coated; A coating mechanism (2) is provided on the top of the conveyor frame (1), which coats the abrasive layer onto the substrate. The two ends of the coating mechanism (2) are provided with longitudinal adjustment mechanisms (3), which are used to adjust the height of the coating mechanism (2); The coating mechanism (2) includes a drive roller (21), a first driven roller (22), and a second driven roller (23), wherein the drive roller (21) is located between the first driven roller (22) and the second driven roller (23); One end of the drive roller (21) is provided with a first motor (233) for driving the drive roller (21) to rotate. The other end of the drive roller (21) is provided with a feeding pipe (24), which is located above the drive roller (21) and the first driven roller (22); The coating mechanism (2) is provided with a lateral adjustment mechanism (4) on both sides; the lateral adjustment mechanism (4) is used to adjust the distance between the drive roller (21) and the driven roller (22, 23) to control the thickness and uniformity of the grinding layer; The bottom of the conveyor belt (11) is provided with a return mechanism (5), which is used to collect the overflow of the grinding layer. The return mechanism (5) includes a receiving element (51), which is located below both sides of the conveyor belt (11). The bottom of the receiving element (51) is provided with a material pipe (52), and the bottom of the material pipe (52) is provided with a collecting pipe (53). The collecting pipe (53) is inclined, and one end of the collecting pipe (53) is provided with a drain hole (531).

2. The apparatus for preparing composite flexible fine grinding sand rolls according to claim 1, characterized in that: One end of the feeding pipe (24) is movably connected to a telescopic pipe (241), and one end of the telescopic pipe (241) is connected to an elbow (242).

3. The apparatus for preparing composite flexible fine grinding sand rolls according to claim 1, characterized in that: A crossbar (231) is provided above the second driven roller (23), and a scraper (232) is installed on the crossbar (231).

4. The apparatus for preparing a composite flexible fine grinding sand roll according to claim 1, characterized in that: The longitudinal adjustment mechanism (3) includes a first link (36), and a drive shaft (361) is provided on both sides of the first link (36). A positioning seat (31) is installed on the drive shaft (361), and a threaded rod (32) that cooperates with the drive shaft (361) is installed on the positioning seat (31). The top of the threaded rod (32) is connected to a connecting seat (33), and a lifting platform (34) is connected to one side of the connecting seat (33). A track (35) is provided on the side of the lifting platform (34). A second motor (37) is provided at one end of the drive shaft (361), and a sprocket (362) is installed on the other end of the drive shaft (361).

5. The apparatus for preparing a composite flexible fine grinding sand roll according to claim 4, characterized in that: The positioning seat (31) and the track (35) are both fixedly installed on both sides of the conveyor frame (1); The rotation of the drive shaft (361) can drive the threaded rod (32) to move up and down.

6. The apparatus for preparing a composite flexible fine grinding sand roll according to claim 4, characterized in that: The lateral adjustment mechanism (4) includes a fixed plate (41), a slide block (42) is slidably connected to the side of the fixed plate (41), a pull rod (43) is connected to one end of the slide block (42), a reversing seat (44) is provided at the other end of the pull rod (43), a second connecting rod (45) is installed on the reversing seat (44), and a third motor (46) for driving the second connecting rod (45) to rotate is installed on the reversing seat (44) on one side.

7. The apparatus for preparing a composite flexible fine grinding sand roll according to claim 4, characterized in that: The top of the lifting platform (34) is fixedly connected to an installation plate (341), and the top of the installation plate (341) and the bottom of the fixed plate (41) are connected to each other.

8. A preparation process, based on the preparation apparatus according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Prepare the substrate: Select an appropriate substrate and ensure that its surface is clean and flat; Prepare the abrasive mixture: Prepare an appropriate amount of abrasive particles and binder mixture according to the required abrasive effect; Step 2: Place the substrate on the conveyor belt (11) and start the conveyor frame (1) to transport the substrate to the coating mechanism (2); The grinding layer mixture is conveyed between the drive roller (21) and the driven rollers (22, 23) through the feed pipe (24) and the telescopic pipe (241); The first motor (233) of the coating mechanism (2) drives the drive roller (21) to rotate, and the action of the drive roller (21) makes the grinding layer mixture evenly distributed on the substrate; The thickness and uniformity of the grinding layer mixture are adjusted by the scraper (232) on the crossbar (231); Step 3: The height of the coating mechanism (2) is adjusted using the longitudinal adjustment mechanism (3) to accommodate substrates and abrasive layers of different thicknesses. The distance between the drive roller (21) and the driven rollers (22, 23) is adjusted using the lateral adjustment mechanism (4) to control the thickness and uniformity of the grinding layer; Step 4: The reflux mechanism (5) in the device collects the overflow of the grinding layer mixture and guides the overflow to the drain hole (531) through the receiving part (51), the feed pipe (52) and the collecting pipe (53), and then recovers it to the collection bin for secondary use.

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