Device for improving the quality of sand and method thereof

Abstract

The application provides a device and method for improving the quality of machine-made sand, one end of a lifting box is provided with a driving motor, the other end is provided with a stirring rod, a plurality of radial vertical cross bars are arranged on the stirring rod, a stirring barrel is further arranged on the bottom plate, the stirring barrel is coaxially arranged with the stirring rod, the stirring rod comprises a first stirring rod and a second stirring rod, a plurality of first cross bars are arranged on the outer surface, the first stirring rod is sleeved with the second stirring rod, the second stirring rod penetrates through the first stirring rod and extends downwards at the end portion, a plurality of radial vertical second cross bars are arranged on the extension section, and the driving motor drives the first stirring rod and the second stirring rod to rotate in opposite directions. The improvement of the product quality has a multi-dimensional effect, so that the improvement of the concrete fluidity and the improvement of other performances are more obvious. It is worth pointing out that the stirring mill in the application is used for improving the grain shape and grading of machine-made sand, and the product particle size is controlled in a certain range, which is obviously different from the use of the stirring mill in other fields, that is, the superfine grinding of substances.

Description

Technical Field

[0001] This invention relates to the field of manufactured sand shaping, and in particular to an apparatus and method for improving the quality of manufactured sand. Background Technology

[0002] Manufactured sand is struggling to meet the sand demands of the construction market. With a significant decrease in the supply of natural sand, manufactured sand has replaced it as the primary source of sand in the construction market. However, overall, the proportion of high-quality manufactured sand is very low, and most sand and gravel companies produce manufactured sand of poor quality. This low-quality manufactured sand severely reduces the fluidity and other properties of concrete. Even when used in conventional concrete, it often needs to be mixed with natural sand, making it even more difficult to meet the demands of high-performance concrete and other high-quality concretes with higher fluidity requirements. Producing high-quality manufactured sand that better meets the fluidity requirements of concrete is of paramount importance for better satisfying the sand demands of the construction market.

[0003] The quality requirements of manufactured sand for concrete fluidity. Particle shape and gradation are the most critical qualities of manufactured sand, significantly impacting various properties of concrete, including fluidity. High-quality manufactured sand should possess characteristics such as a particle shape with few sharp edges and near-spherical shapes, a gradation with multiple intermediate particle sizes conforming to standards like "Aggregates for High-Performance Concrete." The surface condition of manufactured sand also affects concrete fluidity; smooth-surfaced manufactured sand helps improve concrete fluidity.

[0004] Specific manifestations of poor quality manufactured sand. Currently, the proportion of high-quality manufactured sand is very low, and most sand and gravel enterprises produce manufactured sand of poor quality, which is mainly manifested in: (1) poor particle shape. The content of needle-shaped and flaky particles is high, the shape is irregular, and there are many sharp edges. (2) poor gradation. There are significantly more large particles, fewer intermediate particles, and a larger fineness modulus. (3) very rough surface.

[0005] The main reasons for the poor quality of manufactured sand. One of the main reasons for the poor quality of manufactured sand is the unreasonable production process and equipment. There are two main production methods for manufactured sand: dry sand making and wet sand making. (1) The process of dry sand making is rock coarse crushing + medium crushing + screening + shaping + screening + air separation for dust removal. Vertical shaft impact crusher has a better shaping effect, but this equipment has high maintenance requirements, high price, large space occupation and poor product gradation, so it is not widely used in manufactured aggregate mining enterprises. Most manufactured aggregate mining enterprises do not set up a shaping process, but only use hammer crusher, impact crusher or cone crusher as end crushing equipment, but the crushed products of these equipment generally have poor particle shape and poor gradation. (2) The process of wet sand making is rock coarse crushing + medium crushing + screening + shaping + screening + water washing for dust removal. The shaping equipment is rod mill. Rod mill is heavy, has a large amount of civil engineering work, low processing capacity and poor product gradation. The application of wet sand making in the construction industry is relatively limited. (3) In summary, due to the unreasonable existing sand making processes and equipment, the quality of manufactured sand is poor. In particular, the construction industry mainly uses dry sand making, and enterprises using dry sand making processes mostly use impact crushers and cone crushers as aggregate processing equipment, resulting in poor particle shape, poor gradation, rough surface and other low quality problems in manufactured sand. Summary of the Invention

[0006] The main objective of this invention is to provide a device and method for improving the quality of manufactured sand, addressing the problem that the construction industry mainly uses dry sand production, and that enterprises using dry sand production processes often use impact crushers and cone crushers as aggregate processing equipment, resulting in low-quality manufactured sand with poor particle shape, poor gradation, and rough surface.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a device for improving the quality of manufactured sand, wherein a lifting box is provided on the bottom plate, a drive motor is provided at one end of the lifting box, and a stirring rod is provided at the other end. The stirring rod is provided with multiple radially vertical crossbars. A stirring tank is also provided on the bottom plate. The stirring tank and the stirring rod are coaxially arranged. The stirring rod includes a first stirring rod and a second stirring rod. Multiple first crossbars are provided on the outer surface. The first stirring rod and the second stirring rod are sleeved together. The second stirring rod passes through the first stirring rod and extends downward at its end. Multiple radially vertical second crossbars are provided on the extended section. The drive motor drives the first stirring rod and the second stirring rod to rotate in opposite directions.

[0008] In the preferred embodiment, the upper end of the first stirring rod is rotatably connected to the lifting box, the end of the first stirring rod is provided with a fifth bevel gear, the end of the second stirring rod is provided with a fourth bevel gear, the third bevel gear meshes with the fifth and fourth bevel gears, and the third bevel gear is connected to the drive motor.

[0009] In the preferred embodiment, the drive motor end is provided with a first bevel gear, which meshes with a second bevel gear. The second bevel gear is connected to a third bevel gear through a transmission rod. The transmission rod is rotatably connected to multiple rotating support seats, which are located on the lifting box.

[0010] In a preferred embodiment, the first stirring rod is further provided with at least two radially vertical baffles. Adjacent baffles can rotate synchronously. The baffles have a conical plate structure on both sides and are rotatably connected to the first stirring rod.

[0011] In the preferred embodiment, the first stirring rod is provided with a protective cover, the protective cover is provided with an installation cap, the protective cover is provided with a ring in the middle, the bottom of the ring is provided with a seventh bevel gear, the seventh bevel gear is rotatably connected to the ring, and the ends of multiple baffles are provided with a sixth bevel gear, the sixth bevel gear at the end of the baffle meshes with the seventh bevel gear.

[0012] In the preferred embodiment, the plates of adjacent spoilers are arranged perpendicular to each other, and the spoilers are provided with multiple through holes.

[0013] In the preferred embodiment, a fixed base is provided on the base plate, and a lifting device is provided inside the fixed base. The lifting device is connected to the lifting box. The structure of the lifting device is as follows: a lifting motor is provided inside the fixed base, a threaded shaft is provided at the output end of the lifting motor, and a threaded lifting tube is provided at the bottom of the lifting box. The threaded lifting tube is threadedly connected to the threaded shaft.

[0014] In the preferred embodiment, a guide rod is provided on one side of the threaded lifting tube, and the guide rod is slidably connected to the fixed seat.

[0015] In the preferred embodiment, a support base is provided on one side of the mixing tank, and the rotating shafts on both sides of the mixing tank are rotatably connected to the support base and the fixed base respectively. A rotating pressure rod is also provided on one side of the support base, and the rotating pressure rod is inserted through the end of the rotating shaft.

[0016] The mixing tank is also equipped with a pin, and the bottom plate is equipped with a pin seat. The pin is set on the pin seat to fix the mixing tank vertically and perpendicular to the mixing rod.

[0017] In a preferred embodiment, the method includes:

[0018] S1. Take an appropriate amount of material to be ground, water and stirring medium. The medium can be a metal medium or a non-metal medium. For metal media, use steel balls or gray cast iron balls. For non-metal media, use zirconia balls or corundum balls.

[0019] S2. The material to be ground, water, and mixing medium are put into the mixing tank. The drive motor is turned on. The first and second stirring rods stir the material inside the mixing tank. The first and second stirring rods rotate in opposite directions, and the material inside the mixing tank flows up and down in opposite directions, so that the material forms a bottom-up circulating stirring effect.

[0020] S3. The baffle plate in the middle of the first stirring rod rotates according to the flow direction of the material to be ground. The rotation of one baffle plate drives the other baffle plates to rotate synchronously. The design angle of the diameter of the adjacent baffle plates is perpendicular. The baffle plates continuously turbulent the material inside the mixing tank, interrupting the bottom-to-top circulating stirring, so that the material in the middle of the mixing tank can be stirred and ground more evenly.

[0021] S4. After running for the specified time, stop the machine. The lifting motor inside the fixed seat drives the entire lifting box to rise. The lower end of the second stirring rod rises and moves out of the mixing tank. Remove the pin and rotate the rotating pressure rod to make the upper opening of the mixing tank tilt downward to discharge the material.

[0022] S5. Separate the medium and manufactured sand products by screening or magnetic separation, and clean the screened manufactured sand.

[0023] S6. The particle shape of manufactured sand is characterized by the unit flow time method and the sphericity method. The particle shape index of manufactured sand is calculated and compared with the particle shape index of unshaped manufactured sand to obtain the variety improvement rate of manufactured sand.

[0024] This invention provides an apparatus and method for improving the quality of manufactured sand. The method utilizes a stirred mill to prepare the manufactured sand, which is groundbreaking in the production and research of manufactured sand, as there have been no previous reports of stirred mills being used in the construction field. Using a stirred mill to prepare manufactured sand not only significantly improves the particle shape, making it more spherical, but also simultaneously improves the gradation and surface roughness of the product, resulting in a multi-dimensional effect on product quality improvement. Consequently, the improvement in concrete fluidity and other properties is more pronounced. It is worth noting that in this invention, the stirred mill is used to improve the particle shape and gradation of the manufactured sand, controlling the product particle size within a certain range. This is significantly different from the use of stirred mills in other fields, which are mostly used for ultrafine grinding of materials. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] Figure 1 This is a general appearance and structural diagram of the present invention;

[0027] Figure 2 This is a front sectional view of the present invention;

[0028] Figure 3 This is a side sectional view of the present invention;

[0029] Figure 4 This is a diagram of the lifting structure of the lifting box of the present invention;

[0030] Figure 5 This is a structural diagram of the installation of the first and second stirring rods of the present invention;

[0031] Figure 6 This is a cross-sectional view of the installation structure of the first and second stirring rods of the present invention;

[0032] Figure 7 This is a diagram of the spoiler installation structure of the present invention;

[0033] Figure 8 This is a structural diagram of the spoiler installation and connection method of the present invention;

[0034] Figure 9 This is a schematic diagram of the operation of the first stirring rod, the second stirring rod, and the baffle plate of the present invention.

[0035] In the diagram: Base plate 1; Pin seat 101; Fixed seat 2; Drive motor 3; Lifting box 4; First stirring rod 5; First crossbar 501; Stirring tank 6; Rotating shaft 7; Rotating pressure rod 8; Support seat 9; Pin 10; Lifting motor 11; Threaded shaft 12; Threaded lifting pipe 13; First bevel gear 14; Second bevel gear 15; Transmission rod 16; Rotating support seat 17; Third bevel gear 18; Fourth bevel gear 19; Second stirring rod 20; Second crossbar 2001; Fifth bevel gear 21; Baffle 22; Guide rod 23; Protective cover 24; Mounting cover 2401; Ring 2402; Sixth bevel gear 25; Seventh bevel gear 26. Detailed Implementation

[0036] Example 1

[0037] like Figures 1-9 As shown, a device for improving the quality of manufactured sand includes a liftable lifting box 4 mounted on a base plate 1. One end of the lifting box 4 is equipped with a drive motor 3, and the other end with a stirring rod. The stirring rod has multiple radially vertical crossbars. A stirring tank 6 is also mounted on the base plate 1, coaxially arranged with the stirring rod. The stirring rod includes a first stirring rod 5 and a second stirring rod 20, with multiple first crossbars 501 on its outer surface. The first stirring rod 5 and the second stirring rod 20 are sleeved together. The second stirring rod 20 passes through the first stirring rod 5 and extends downwards at its end, with multiple radially vertical second crossbars 2001 on the extended section. The drive motor 3 drives the first stirring rod 5 and the second stirring rod 20 to rotate in opposite directions. Figure 9 As shown in the diagram, the material to be ground, water, and mixing medium are placed inside the mixing drum 6. The drive motor 3 is turned on, and the first stirring rod 5 and the second stirring rod 20 stir the material inside the mixing drum 6. The first stirring rod 5 and the second stirring rod 20 rotate in opposite directions, and the material inside the mixing drum 6 flows in opposite directions, creating a bottom-to-top circulating stirring effect. This significantly improves the particle shape of the product, making it more spherical, and simultaneously improves the product's gradation and surface roughness, resulting in a multi-dimensional effect on product quality improvement. Consequently, the improvement in concrete fluidity and other properties is also more pronounced.

[0038] In the preferred embodiment, the upper end of the first stirring rod 5 is rotatably connected to the lifting box 4. A fifth bevel gear 21 is provided at the end of the first stirring rod 5, and a fourth bevel gear 19 is provided at the end of the second stirring rod 20. A third bevel gear 18 meshes with the fifth bevel gear 21 and the fourth bevel gear 19, and is connected to the drive motor 3. The third bevel gear 18 drives the fifth bevel gear 21 and the fourth bevel gear 19 to move in opposite directions, thus achieving opposite rotation directions for the first stirring rod 5 and the second stirring rod 20.

[0039] In the preferred embodiment, the drive motor 3 has a first bevel gear 14 at its end, which meshes with a second bevel gear 15. The second bevel gear 15 is connected to a third bevel gear 18 via a transmission rod 16. The transmission rod 16 is rotatably connected to multiple rotating support seats 17, which are mounted on the lifting box 4. The installation method of the drive motor 3 mainly balances the first stirring rod 5 and the second stirring rod 20, using the meshing drive of the first bevel gear 14 and the second bevel gear 15, resulting in a more stable overall structure.

[0040] In a preferred embodiment, the first stirring rod 5 is further provided with at least two radially vertical baffles 22. Adjacent baffles 22 can rotate synchronously. The baffles 22 have a conical plate structure on both sides and are rotatably connected to the first stirring rod 5. Figure 9 As shown in the structure, the baffle 22 in the middle of the first stirring rod 5 rotates according to the flow direction of the material to be ground. The rotation of one baffle drives the other baffles to rotate synchronously. The diameter of adjacent baffles is designed to be perpendicular. The baffles continuously turbulent the material inside the mixing tank 6, interrupting the bottom-to-top circulating stirring, so that the material in the middle of the mixing tank 6 can be stirred and ground more evenly. The baffle 22 can achieve automatic axial rotation. The rotation of one baffle 22 will drive the other baffles to rotate. The baffle 22 rotates continuously during the stirring process and will not stop rotating.

[0041] In the preferred embodiment, the first stirring rod 5 is provided with a protective cover 24, the protective cover 24 is provided with a mounting cover 2401, the protective cover 24 is provided with a ring 2402 in the middle, and a seventh bevel gear 26 is provided at the bottom of the ring 2402. The seventh bevel gear 26 is rotatably connected to the ring 2402. Each end of the multiple spoilers 22 is provided with a sixth bevel gear 25, and the sixth bevel gear 25 at the end of the spoilers 22 meshes with the seventh bevel gear 26. The sixth bevel gears 25 at the ends of the multiple spoilers 22 are installed inside the protective cover 24, and the sixth bevel gears 25 at the ends of the multiple spoilers 22 mesh with the seventh bevel gear 26 to achieve the technical effect of mutual driving.

[0042] In the preferred embodiment, the adjacent baffles 22 are arranged perpendicularly to each other, and the baffles 22 are provided with multiple through holes. The multiple through holes reduce the resistance during rotation and also facilitate the mixing of the manufactured sand.

[0043] In the preferred embodiment, a fixed base 2 is provided on the base plate 1, and a lifting device is provided inside the fixed base 2. The lifting device is connected to the lifting box 4. The structure of the lifting device is as follows: a lifting motor 11 is provided inside the fixed base 2, and a threaded shaft 12 is provided at the output end of the lifting motor 11. A threaded lifting tube 13 is provided at the bottom of the lifting box 4, and the threaded lifting tube 13 is threadedly connected to the threaded shaft 12. The lifting device drives the entire lifting box 4 to move up and down.

[0044] In the preferred embodiment, a guide rod 23 is provided on one side of the threaded lifting tube 13, and the guide rod 23 is slidably connected to the fixed base 2. The guide rod 23 serves a guiding function, making the lifting box 4 move up and down more smoothly.

[0045] In the preferred embodiment, a support base 9 is provided on one side of the mixing tank 6, and the rotating shafts 7 on both sides of the mixing tank 6 are rotatably connected to the support base 9 and the fixed base 2 respectively. A rotating pressure rod 8 is also provided on one side of the support base 9, and the rotating pressure rod 8 is inserted through the end of the rotating shaft 7. The rotating pressure rod 8 achieves the technical effect of rotating the mixing tank 6 and completing the feeding.

[0046] The mixing tank 6 is also equipped with a pin 10, and the base plate 1 is equipped with a pin seat 101. The pin 10 is set on the pin seat 101 to fix the mixing tank 6 vertically and perpendicular to the mixing rod. The pin 10 serves to fix the position of the entire mixing tank 6.

[0047] Example 2

[0048] Further explanation in conjunction with Example 1, such as Figures 1-9 As shown, the method includes: taking an appropriate amount of material to be ground, water and a stirring medium, wherein the medium is a metal medium or a non-metal medium, the metal medium is a steel ball or a gray cast iron ball, and the non-metal medium is a zirconia ball or a corundum ball;

[0049] The material to be ground, water, and stirring medium are put into the mixing tank 6. The drive motor 3 is turned on. The first stirring rod 5 and the second stirring rod 20 stir the material inside the mixing tank 6. The first stirring rod 5 and the second stirring rod 20 rotate in opposite directions, and the material inside the mixing tank 6 flows up and down in opposite directions, so that the material forms a bottom-up circulating stirring effect.

[0050] The baffle plate 22 in the middle of the first stirring rod 5 rotates according to the flow direction of the material to be ground. The rotation of one baffle plate drives the other baffle plates to rotate synchronously. The design angle of the diameter of the adjacent baffle plates is a vertical angle. The baffle plates continuously turbulent the material inside the mixing tank 6, interrupting the bottom-to-top circulating stirring, so that the material in the middle of the mixing tank 6 can be stirred and ground more evenly.

[0051] After running for the specified time, the machine stops. The lifting motor 11 inside the fixed base 2 drives the entire lifting box 4 to rise. The lower end of the second stirring rod 20 rises and moves out of the mixing tank 6. The pin 10 is removed, and the rotating pressure rod 8 is rotated to make the upper opening of the mixing tank 6 tilt downward to discharge the material.

[0052] The medium and manufactured sand products are separated by screening or magnetic separation, and the screened manufactured sand is then cleaned.

[0053] The particle shape of manufactured sand was characterized by the unit flow time method and the sphericity method. The particle shape index of manufactured sand was calculated, and the obtained particle shape index was compared with that of unshaped manufactured sand to obtain the variety improvement rate of manufactured sand.

[0054] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An apparatus for improving the quality of manufactured sand, characterized in that: A lifting box (4) that can be raised and lowered is provided on the base plate (1). One end of the lifting box (4) is provided with a drive motor (3) and the other end is provided with a stirring rod. The stirring rod is provided with multiple radially vertical crossbars. The base plate (1) is also provided with a stirring tank (6). The stirring tank (6) is coaxially arranged with the stirring rod. The stirring rod includes a first stirring rod (5) and a second stirring rod (20). Multiple first crossbars (501) are provided on the outer surface. The first stirring rod (5) is sleeved with the second stirring rod (20). The second stirring rod (20) passes through the first stirring rod (5) and extends downward at its end. Multiple radially vertical second crossbars (2001) are provided on the extended section. The drive motor (3) drives the first stirring rod (5) and the second stirring rod (20) to rotate in opposite directions. The first stirring rod (5) is also provided with at least two radially vertical baffles (22). The adjacent baffles (22) can rotate synchronously. The baffles (22) have a conical plate structure on both sides and are rotatably connected to the first stirring rod (5). The first stirring rod (5) is provided with a protective cover (24), the protective cover (24) is provided with an installation cover (2401), the protective cover (24) is provided with a ring sleeve (2402) in the middle, the bottom of the ring sleeve (2402) is provided with a seventh bevel gear (26), the seventh bevel gear (26) is rotatably connected to the ring sleeve (2402), and the ends of multiple baffles (22) are provided with a sixth bevel gear (25), the sixth bevel gear (25) at the end of the baffle (22) meshes with the seventh bevel gear (26); The upper end of the first stirring rod (5) is rotatably connected to the lifting box (4). The end of the first stirring rod (5) is provided with a fifth bevel gear (21), the end of the second stirring rod (20) is provided with a fourth bevel gear (19), the third bevel gear (18) meshes with the fifth bevel gear (21) and the fourth bevel gear (19), and the third bevel gear (18) is connected to the drive motor (3). The drive motor (3) is provided with a first bevel gear (14) at its end. The first bevel gear (14) meshes with the second bevel gear (15). The second bevel gear (15) is connected to the third bevel gear (18) through the transmission rod (16). The transmission rod (16) is rotatably connected to multiple rotating support seats (17). The rotating support seats (17) are located on the lifting box (4). The plates of adjacent spoilers (22) are arranged perpendicular to each other, and the spoilers (22) are provided with multiple through holes; The baffle plate (22) in the middle of the first stirring rod (5) rotates according to the flow direction of the material to be ground. The rotation of one baffle plate drives the other baffle plates to rotate synchronously. The design angle between adjacent baffle plates is a vertical angle. The baffle plates continuously turbulent the material inside the mixing tank (6) and interrupt the bottom-to-top circulating stirring.

2. The device for improving the quality of manufactured sand according to claim 1, characterized in that: A fixed seat (2) is provided on the base plate (1). A lifting device is provided inside the fixed seat (2). The lifting device is connected to the lifting box (4). The structure of the lifting device is as follows: a lifting motor (11) is provided inside the fixed seat (2). A threaded shaft (12) is provided at the output end of the lifting motor (11). A threaded lifting pipe (13) is provided at the bottom of the lifting box (4). The threaded lifting pipe (13) is threadedly connected to the threaded shaft (12).

3. The device for improving the quality of manufactured sand according to claim 2, characterized in that: A guide rod (23) is provided on one side of the threaded lifting tube (13), and the guide rod (23) is slidably connected to the fixed seat (2).

4. The device for improving the quality of manufactured sand according to claim 2, characterized in that: A support base (9) is provided on one side of the mixing tank (6). The rotating shafts (7) on both sides of the mixing tank (6) are rotatably connected to the support base (9) and the fixed base (2) respectively. A rotating pressure rod (8) is also provided on one side of the support base (9). The rotating pressure rod (8) is inserted through the end of the rotating shaft (7). The mixing tank (6) is also provided with a pin (10), and the bottom plate (1) is provided with a pin seat (101). The pin (10) is set on the pin seat (101) to fix the mixing tank (6) vertically and perpendicular to the mixing rod.

5. A method for improving the quality of manufactured sand using an apparatus according to any one of claims 1-4, characterized in that: The method includes: S1. Take an appropriate amount of material to be ground, water and stirring medium. The medium can be a metal medium or a non-metal medium. For metal media, use steel balls or gray cast iron balls. For non-metal media, use zirconia balls or corundum balls. S2. The material to be ground, water and stirring medium are put into the mixing tank (6), and the drive motor (3) is turned on. The first stirring rod (5) and the second stirring rod (20) stir the material inside the mixing tank (6). The first stirring rod (5) and the second stirring rod (20) rotate in opposite directions, and the material inside the mixing tank (6) flows up and down in opposite directions, so that the material forms a bottom-up circulating stirring effect. S3. The baffle plate (22) in the middle of the first stirring rod (5) rotates according to the flow direction of the material to be ground. The rotation of one baffle plate drives the other baffle plates to rotate synchronously. The design angle between adjacent baffle plates is a vertical angle. The baffle plates continuously turbulent the material inside the mixing tank (6), interrupting the bottom-to-top circulating stirring, so that the material in the middle of the mixing tank (6) can be stirred and ground more evenly. S4. After running for a specified time, stop the machine. The lifting motor (11) inside the fixed seat (2) drives the entire lifting box (4) to rise. The lower end of the second stirring rod (20) rises and moves out to the outside of the mixing tank (6). Remove the pin (10) and rotate the rotating pressure rod (8) to make the upper opening of the mixing tank (6) tilt downward to discharge the material. S5. Separate the medium and manufactured sand products by screening or magnetic separation, and clean the screened manufactured sand. S6. The particle shape of manufactured sand is characterized by the unit flow time method and the sphericity method. The particle shape index of manufactured sand is calculated and compared with the particle shape index of unshaped manufactured sand to obtain the variety improvement rate of manufactured sand.

Images