A quartz sand hydraulic classification device and method

Abstract

The invention relates to the field of sand making equipment, and in particular to a quartz sand hydraulic grading equipment and method. The quartz sand hydraulic grading equipment comprises a grading tank body, wherein a grading liner is arranged inside the grading tank body, and the grading liner has a grading space which expands from the inside to the outside in multiple stages so that the quartz sand is gradually screened from large to small. A drainage pipe extending to the depth thereof is arranged in each grading space, and a piston assembly for squeezing the quartz sand floating on the water surface from the drainage pipe assembly is arranged in the drainage pipe assembly. The invention effectively isolates the quartz sand newly entering the grading space from the quartz sand being graded through the drainage pipe assembly, and avoids the quartz sand which has not yet settled following the floating quartz sand into the next stage along with the water flow. After the piston assembly presses the quartz sand in the drainage pipe assembly into the depth of the water, the quartz sand of this part is graded in the depth of the water, thereby improving the graded purity.

Description

Technical Field

[0001] The invention relates to the field of sand making equipment, in particular to a quartz sand hydraulic classification device and a quartz sand hydraulic classification method. Background Art

[0002] Quartz sand is quartz particles obtained by crushing quartz stone. In the prior art, after the quartz sand is ground, it needs to be classified according to the size of its quartz sand particle size. At present, a hydraulic classification tower is generally used to classify the quartz sand. However, the hydraulic classification tower in the prior art can simultaneously sort a small number of quartz sand particle sizes. Multiple hydraulic classification towers are required to achieve simultaneous classification of multiple quartz sands, and the working efficiency is low.

[0003] The currently disclosed Chinese patent CN217569125U discloses a hydraulic classification tower for quartz sand production, comprising a classification tower, wherein a feed pipe is arranged at the top of the classification tower; along the radial direction of the classification tower, a plurality of auxiliary classification covers are coaxially sleeved on the classification tower, and the classification tower and the top of each auxiliary classification cover are provided with an overflow pipe for connecting to the auxiliary classification cover of the next level, and the auxiliary classification cover of the last level is provided with a drain port; the classification tower and the bottom of each level of the auxiliary classification cover are also provided with a sand discharge port and a water inlet pipe for providing water for classification.

[0004] According to the above patent, the patent conveys grading water with different pressures to the grading tower and each level of auxiliary grading covers through a water inlet pipe. When the gravity of the quartz sand particles themselves is greater than the buoyancy of the grading water, they settle to the bottom and are excluded from the grading tower. Otherwise, the quartz sand particles flow into the next level from the overflow port with the water flow. Quartz sand of different particle grades can be graded by applying grading water of different pressures. However, in actual use, the pouring of raw materials has a great impact on the raw materials that are already being graded in the equipment. For example, when the raw materials are poured directly from above, they will mix with the light materials on the top, causing the originally precipitated materials to follow the floating materials into the next level. Therefore, there is a need for a hydraulic grading device that can ensure accurate grading of quartz sand. Summary of the invention

[0005] In view of the problems existing in the prior art, a quartz sand hydraulic classification device is provided. The present invention effectively isolates the quartz sand newly entering the classification space from the quartz sand being classified through a drainage pipe fitting, thereby preventing the quartz sand that has not yet settled from following the floating quartz sand into the next level with the water flow. After the piston assembly presses the quartz sand in the drainage pipe fitting into the deep water, the quartz sand in this part is classified in the deep water, thereby improving the classification purity.

[0006] To solve the problems of the prior art, the present invention provides a quartz sand hydraulic grading device, comprising a grading tank body, a feed port is provided on the top of the grading tank body, a grading inner tank body is provided inside the grading tank body for hydraulically screening quartz sand, the grading inner tank body has multiple levels of grading spaces that expand from the inside to the outside so that the quartz sand is gradually screened from large to small, a water inlet and a discharge port are provided on the grading tank body corresponding to each grading space, each grading space is provided with a drainage pipe extending to the depth thereof, a piston assembly is provided in the drainage pipe assembly for squeezing the quartz sand floating on the water surface from the drainage pipe assembly, when the quartz sand is hydraulically graded in the grading inner tank, the quartz sand to be graded is pressed into the depth of the water in the drainage pipe assembly, so that the quartz sand that has not yet settled will not directly follow the floating quartz sand into the grading space of the next level.

[0007] Preferably, the grading inner tank is composed of a plurality of coaxially sleeved and connected overflow pipes, and the grading space is formed inside the innermost overflow pipe and between every two adjacent overflow pipes.

[0008] Preferably, the graded inner tank is composed of a plurality of overflow pipes arranged with decreasing heights from the inner layer to the outer layer.

[0009] Preferably, the piston assembly in the drainage pipe of the innermost overflow pipe is an insertion rod that can be inserted into the drainage pipe, and a linear driver for driving the insertion rod to move is provided on the grading tank.

[0010] Preferably, the piston assembly in the drainage pipe fittings of two adjacent overflow pipes is a pressure ring that can be inserted into the drainage pipe fittings, the pressure ring is slidably sleeved on the overflow pipe, and the grading tank body is provided with an extrusion driver for driving the pressure ring to move.

[0011] Preferably, a tension spring is fixedly connected between the pressure ring and the overflow pipe, and when the pressure ring does not block the gap between the drainage pipe and the overflow pipe, the tension spring is in a state of not being acted upon by external force.

[0012] Preferably, the extrusion driver is provided with a gland mounted on the grading tank and an airbag mounted on the gland, the gland is provided with an air passage for inflating the airbag, and when the airbag expands, the pressure ring is pushed by the airbag to move downward.

[0013] Preferably, a compression spring is fixedly connected between the gland and the grading tank body. When the compression spring is not subjected to external force, the gland covers the upper end of the overflow pipe of the upper layer, and the edge of the gland fits with the drainage pipe.

[0014] Preferably, the grading tank body has a fixed hopper connected to the innermost drainage pipe member, and a rotating hopper is provided on the fixed hopper to rotate relative to the fixed hopper.

[0015] The present invention also provides a quartz sand hydraulic classification method, comprising the following steps:

[0016] S1. A mixture of quartz sands of different particle sizes is fed into the grading tank through the feed port at the top of the grading tank, and falls into the grading space of the innermost layer of the grading liner;

[0017] S2. Start the hydraulic system, inject water through the water inlets corresponding to each grading space on the grading tank, and ensure that the water pressure in the grading space from the previous level to the next level gradually decreases;

[0018] S3. Quartz sand with gravity greater than buoyancy settles to the bottom and is discharged from the discharge port, while quartz sand with gravity less than buoyancy flows into the next level of grading space with the water flow until the quartz sand is graded from large to small.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows: the present invention realizes the natural sedimentation and stratification of quartz sand of different particle sizes through the design of gradually decreasing water pressure from the inside to the outside in the grading inner tank and the promotion of quartz sand by water flow, thereby ensuring that the quartz sand is separated step by step according to the particle size, and finally achieving the precise grading effect from large to small, and effectively isolates the quartz sand newly entering the grading space from the quartz sand being graded through the drainage pipe fitting, avoiding the quartz sand that has not yet settled to follow the floating quartz sand into the next level with the water flow, and after the piston assembly presses the quartz sand in the drainage pipe fitting into the deep water, the quartz sand of this part is graded in the deep water, ensuring the clear separation of the particle size of each grade of quartz sand and improving the grading purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a quartz sand hydraulic classification equipment.

[0021] Figure 2 It is a partial plan cross-sectional view of a quartz sand hydraulic classification device.

[0022] Figure 3 The present invention is a partial three-dimensional structural cross-sectional view of a quartz sand hydraulic classification device.

[0023] Figure 4 The present invention is a schematic diagram of a plane state of a piston assembly of a quartz sand hydraulic classification device without extending into a drainage pipe.

[0024] Figure 5 The present invention is a schematic diagram of a plane state in which a piston assembly of a quartz sand hydraulic classification device has been extended into a drainage pipe.

[0025] Figure 6 The present invention is a schematic diagram of a partial plane state of a piston assembly of a quartz sand hydraulic classification device without extending into a drainage pipe.

[0026] Figure 7The utility model is a schematic diagram of a local plane state in which a piston assembly of a quartz sand hydraulic classification device has been extended into a drainage pipe.

[0027] Figure 8 yes Figure 6 An enlarged schematic diagram of point A.

[0028] Fig. 9 yes Figure 7 An enlarged schematic diagram of point B.

[0029] Fig.10 yes Figure 6 Enlarged schematic diagram of point C.

[0030] Fig.11 yes Figure 7 Enlarged schematic diagram of point D.

[0031] The numbers in the figure are: 1. grading tank; 11. feed inlet; 12. water inlet; 13. discharge port; 14. water outlet; 2. grading liner; 21. grading space; 22. overflow pipe; 3. drainage pipe fittings; 4. piston assembly; 41. plug rod; 411. linear drive; 42. pressure ring; 421. extrusion drive; 4211. pressure cover; 4212. air bag; 422. tension spring; 423. compression spring; 5. fixed hopper; 6. rotating hopper. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] See also Figure 1-Figure 7 As shown, a quartz sand hydraulic classification device comprises a classification tank body 1, a feed port 11 is provided on the top of the classification tank body 1, a classification inner tank 2 for hydraulically screening quartz sand is provided inside the classification tank body 1, the classification inner tank 2 has multiple levels of classification spaces 21 extending from the inside to the outside so that the quartz sand is gradually screened from large to small, a water inlet 12 and a discharge port 13 are provided on the classification tank body 1 corresponding to each classification space 21, each classification space 21 is provided with a drainage pipe 3 extending to the depth thereof, a piston assembly 4 is provided in the drainage pipe 3 for squeezing the quartz sand floating on the water surface from the drainage pipe 3, when the quartz sand is hydraulically classified in the classification inner tank 2, the quartz sand to be classified is pressed into the depth of the water in the drainage pipe 3 by the piston assembly 4, so that the quartz sand that has not yet settled will not directly follow the floating quartz sand into the classification space 21 of the next level.

[0034] The grading space 21 corresponding to the last level on the grading tank 1 is also provided with a drain port 14 for discharging the floating quartz sand. When the quartz sand is hydraulically graded, first, a mixture containing quartz sand of different particle sizes enters the internal grading tank 2 through the feed port 11 on the top of the grading tank 1. At the same time, the hydraulic system is started, and water is introduced into the grading tank 2 through the water inlet 12. The water pressure in the grading tank 2 from the grading space 21 of the upper level to the grading space 21 of the lower level gradually decreases. With the push of the water flow, the quartz sand undergoes a multi-level grading process in the grading tank 2. Under the action of the hydrodynamic force, quartz sand of different particle sizes naturally settles and layers according to the particle size. When the gravity of the quartz sand particles themselves is greater than the buoyancy of the grading water, they settle to the bottom. Otherwise, the quartz sand particles flow into the next level with the water flow. Quartz sand of different particle grades can be graded by applying grading water of different pressures. In each grading space 21, the quartz sand that has just entered the grading space 21 is separated from the quartz sand being graded by the drainage pipe 3, so as to prevent the quartz sand that has not been graded from directly following the quartz sand being graded in the current grading space 21 to enter the grading space 21 of the next level. The movement of the piston assembly 4 forces the quartz sand floating on the water surface and not yet completely settled in the current grading space 21 into the depth of the water through the squeezing effect, so that the quartz sand in the drainage pipe 3 can begin to be graded in the depth of the water, and the quartz sand that is finally settled is discharged from the discharge port 13, while the finest quartz sand that fails to settle is discharged through the drainage port 14 of the outermost grading space 21, so as to achieve accurate grading from large to small.

[0035] See also Figure 2-Figure 7 As shown, the grading inner tank 2 is composed of a plurality of coaxially sleeved and interconnected overflow pipes 22 , and the grading space 21 is formed inside the innermost overflow pipe 22 and between every two adjacent overflow pipes 22 .

[0036] When the mixture containing quartz sand of different particle sizes enters the grading tank 1 and passes through the innermost overflow pipe 22, the hydraulic system is started at the same time, and water flow is introduced to push the quartz sand to move in each grading space 21. Since the water pressure of the grading space 21 decreases from the inside to the outside, coupled with the push of the water flow, the quartz sand begins to be naturally stratified according to the particle size under the action of hydrodynamic force. The quartz sand with gravity greater than buoyancy settles at the bottom of the grading space 21, and the quartz sand with gravity less than buoyancy flows with the water flow to the next grading space 21 until it is precipitated in the subsequent grading space 21. As the grading process proceeds, the quartz sand settled in each grading space 21 is discharged through the respective discharge ports 13, ensuring the effective separation of quartz sand of different particle sizes.

[0037] See also Figure 2-Figure 7 As shown, the graded inner tank 2 is composed of a plurality of overflow pipes 22 arranged with decreasing heights from the inner layer to the outer layer.

[0038] The layout of the overflow pipe 22 with decreasing height can make the quartz sand flow from the upper level grading space 21 into the lower level grading space 21 following the water flow, which helps quartz sand of different particle sizes to settle in layers according to particle size under the push of the water flow, so as to facilitate the quartz sand to flow from the upper level overflow pipe 22 into the lower level overflow pipe 22 following the water flow until it completes sedimentation in the water flow of the grading space 21 where the gravity of the quartz sand is greater than the buoyancy.

[0039] See also Figure 4 and Figure 5 As shown, the piston assembly 4 in the drainage pipe 3 of the innermost overflow pipe 22 is an insertion rod 41 that can be inserted into the drainage pipe 3, and the grading tank body 1 is provided with a linear driver 411 for driving the insertion rod 41 to move.

[0040] When the grading process begins, the quartz sand in the innermost overflow pipe 22 is graded under the action of water pressure. The quartz sand with gravity greater than buoyancy sinks, and the quartz sand with gravity less than buoyancy floats and overflows to the next grading space 21. During this process, the rod 41 moves downward in a timely manner to apply pressure to the newly added quartz sand floating on the water surface and located in the drainage pipe 3, forcing the quartz sand to sink, so that this part of the quartz sand begins to be graded in the deep water, avoiding the quartz sand from directly entering the next level of grading space 21 with the overflowing water flow, ensuring the accurate grading. After the rod 41 is inserted into the corresponding drainage pipe 3, the pipe mouth of the drainage pipe 3 is closed, and quartz sand cannot be added anymore, and the quartz sand is graded by intermittent feeding.

[0041] See also Figure 4-Figure 7 As shown, the piston assembly 4 in the drainage pipe 3 of two adjacent overflow pipes 22 is a pressure ring 42 that can be inserted into the drainage pipe 3. The pressure ring 42 is slidably sleeved on the overflow pipe 22, and the grading tank body 1 is provided with an extrusion driver 421 for driving the pressure ring 42 to move.

[0042] When the quartz sand enters the next level from the previous level, the quartz sand enters the drainage pipe 3. At this time, the extrusion driver 421 controls the pressure ring 42 to slide on the overflow pipe 22. The pressure ring 42 moves down in time to apply vertical pressure to the quartz sand that has just entered the drainage pipe 3, causing this part of the quartz sand to sink and prevent them from directly following the water flow into the next level. Under the action of the pressure ring 42, the quartz sand that has just entered and the quartz sand being graded are effectively separated in each grading space 21. Through the timely upward movement of the pressure ring 42, the quartz sand that has been graded from the previous grading space 21 is allowed to continue to flow naturally to the next level, thereby realizing a continuous and orderly grading process.

[0043] See also Figure 6-Figure 11As shown, a tension spring 422 is fixedly connected between the pressure ring 42 and the overflow pipe 22. When the pressure ring 42 does not block the gap between the drainage pipe 3 and the overflow pipe 22, the tension spring 422 is in a state of not being acted upon by external force.

[0044] When the tension spring 422 between the pressure ring 42 and the overflow pipe 22 is in a state without external force, the pressure ring 42 will not hinder or pressure the flow of quartz sand in the drainage pipe 3, maintain the natural gap between the drainage pipe 3 and the overflow pipe 22, and allow water and quartz sand to flow freely. When the grading process starts and it is necessary to control the flow and grading of quartz sand, the extrusion driver 421 drives the pressure ring 42 to move downward along the axial direction of the overflow pipe 22, and the tension spring 422 begins to be stretched. As the pressure ring 42 moves downward, the gap between the drainage pipe 3 and the overflow pipe 22 is closed, preventing the insufficiently graded quartz sand from directly entering the next-level grading space 21. After the quartz sand between the drainage pipe 3 and the overflow pipe 22 is pressed into the depth of the water, the extrusion driver 421 is relaxed, and the elastic force of the tension spring 422 prompts the pressure ring 42 to move back upward, opening the gap between the drainage pipe 3 and the overflow pipe 22 again, allowing the quartz sand to continue to flow naturally into the grading space 21.

[0045] See also Figure 6-Figure 11 As shown, the extrusion driver 421 is provided with a pressure cover 4211 installed on the grading tank body 1 and an air bag 4212 installed on the pressure cover 4211. The pressure cover 4211 is provided with an air passage capable of inflating the air bag 4212. When the air bag 4212 expands, the pressure ring 42 is pushed by the air bag 4212 to move downward.

[0046] When the external air source inflates the airbag 4212 through the airway, as the gas enters the airbag 4212, the airbag 4212 begins to expand and increase in volume, and the thrust generated acts on the pressure ring 42, causing the pressure ring 42 to move downward along the axial direction of the overflow pipe 22. As the pressure ring 42 moves downward, the gap between the drainage pipe 3 and the overflow pipe 22 is blocked, and pressure is applied to the quartz sand in the drainage pipe 3, so that the quartz sand in the gap is forced to enter the deep water to prevent it from overflowing directly to the next level with the water flow. When the grading operation reaches the expected level, the inflation of the airbag 4212 is stopped, the airbag 4212 is exhausted through the airway, and the volume is reduced. The elastic force of the tension spring 422 causes the pressure ring 42 to rebound to its initial position, restoring the natural flow of the quartz sand from the previous level to the next level.

[0047] See also Figure 6-Figure 11 As shown, a compression spring 423 is fixedly connected between the pressure cover 4211 and the grading tank body 1. When the compression spring 423 is in a state without being acted upon by an external force, the pressure cover 4211 covers the upper end of the overflow pipe 22 of the upper layer, and the edge of the pressure cover 4211 fits with the drainage pipe 3.

[0048] When water stops entering the upper-level grading space 21, the pressure cover 4211 covers the upper end pipe opening of the upper overflow pipe 22 without the action of the compression spring 423, and at the same time, the edge of the pressure cover 4211 is tightly fitted with the drainage pipe 3. At this time, the channel between the upper-level grading space 21 and the lower-level grading space 21 is temporarily closed, which not only prevents the quartz sand from directly entering the lower layer through the overflow pipe 22 without being fully graded, but also facilitates the air bag 4212 to expand along the only path to push the pressure ring 42. When it is necessary to open the channel between the upper-level grading space 21 and the lower-level grading space 21, water starts to enter the upper-level grading space 21, the pressure cover 4211 is pushed up, the fit between the edge of the pressure cover 4211 and the drainage pipe 3 is released, and at the same time, the upper end pipe opening of the overflow pipe 22 is also opened, allowing the quartz sand floating in the upper-level grading space 21 to enter the lower-level grading space 21.

[0049] See also Figure 2-Figure 7 As shown, the grading tank body 1 has a fixed hopper 5 connected to the innermost drainage pipe 3, and a rotating hopper 6 is provided on the fixed hopper 5 to rotate relative to the fixed hopper 5.

[0050] The rotating hopper 6 can prevent the quartz sand from staying on the surface during the rotation process, and promote the continuous movement of the quartz sand to ensure that the quartz sand slides downward toward the hopper mouth.

[0051] A quartz sand hydraulic classification method is applied to a quartz sand hydraulic classification device, comprising the following steps:

[0052] S1, feeding a mixture of quartz sand of different particle sizes into the grading tank 1 through the feed port 11 at the top thereof, and dropping the mixture into the grading space 21 of the innermost layer of the grading liner 2;

[0053] S2, start the hydraulic system, inject water through the water inlet 12 corresponding to each grading space 21 on the grading tank 1, and ensure that the water pressure of the grading space 21 from the previous level to the next level shows a gradually decreasing trend;

[0054] S3, the quartz sand with a gravity greater than its buoyancy settles to the bottom and is discharged from the discharge port 13, while the quartz sand with a gravity less than its buoyancy flows into the next level classification space 21, until the quartz sand is classified from large to small.

[0055] The present invention ensures that the quartz sand is separated step by step according to the particle size through the design of gradually decreasing water pressure from the inside to the outside in the grading inner tank 2 and the promotion of the water flow on the quartz sand, and finally achieves the precise grading effect from large to small. The quartz sand newly entering the grading space 21 and the quartz sand being graded are effectively isolated through the drainage pipe 3, and the quartz sand that has not yet settled is prevented from following the floating quartz sand into the next level with the water flow. After the piston assembly 4 presses the quartz sand in the drainage pipe 3 into the deep water, the quartz sand of this part is graded in the deep water, ensuring the clear separation of the particle sizes of each grade of quartz sand and improving the classification purity.

[0056] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A quartz sand hydraulic classification device, comprising a classification tank (1), wherein a feed inlet (11) is provided at the top of the classification tank (1), and a classification inner tank (2) is provided inside the classification tank (1) for hydraulically screening quartz sand; It is characterized in that The grading inner tank (2) has multiple grading spaces (21) extending from the inside to the outside so that the quartz sand is gradually screened from large to small. The grading tank body (1) has a water inlet (12) and a discharge port (13) corresponding to each grading space (21). Each grading space (21) is provided with a drainage pipe (3) extending to the depth thereof. The drainage pipe (3) is provided with a piston assembly (4) for squeezing the quartz sand floating on the water surface from the drainage pipe (3). When the quartz sand is hydraulically classified in the classification inner tank (2), the quartz sand to be classified is pressed into the depth of the water through the piston assembly (4) in the drainage pipe (3), so that the quartz sand that has not yet settled will not directly follow the floating quartz sand into the next level of classification space (21); The grading inner tank (2) is composed of a plurality of coaxially sleeved and interconnected overflow pipes (22), wherein the interior of the innermost overflow pipe (22) and between every two adjacent overflow pipes (22) form the grading space (21); The graded inner tank (2) is composed of a plurality of overflow pipes (22) arranged with decreasing heights from the inner layer to the outer layer; The piston assembly (4) in the drainage pipe member (3) of the innermost overflow pipe (22) is an insertion rod (41) that can be inserted into the drainage pipe member (3), and a linear drive (411) for driving the insertion rod (41) to move is provided on the grading tank body (1); The piston assembly (4) in the drainage pipe fittings (3) of two adjacent overflow pipes (22) is a pressure ring (42) that can be inserted into the drainage pipe fittings (3), the pressure ring (42) is slidably sleeved on the overflow pipe (22), and the grading tank body (1) is provided with an extrusion driver (421) for driving the pressure ring (42) to move; A tension spring (422) is fixedly connected between the pressure ring (42) and the overflow pipe (22); when the pressure ring (42) does not block the gap between the drainage pipe (3) and the overflow pipe (22), the tension spring (422) is in a state where no external force is applied; The extrusion driver (421) is provided with a pressure cover (4211) mounted on the grading tank body (1) and an air bag (4212) mounted on the pressure cover (4211); the pressure cover (4211) is provided with an air passage capable of inflating the air bag (4212); when the air bag (4212) expands, the pressure ring (42) is pushed by the air bag (4212) to move downward; A compression spring (423) is fixedly connected between the gland (4211) and the grading tank body (1); when the compression spring (423) is in a state where no external force is applied, the gland (4211) covers the upper end of the overflow pipe (22) of the upper layer, and the edge of the gland (4211) fits against the drainage pipe (3).

2. A quartz sand hydraulic classification equipment according to claim 1, characterized in that: The grading tank body (1) has a fixed hopper (5) connected to the innermost drainage pipe member (3) inside, and a rotating hopper (6) is provided on the fixed hopper (5) to rotate relative to the fixed hopper (5).

3. A quartz sand hydraulic classification method, applied to a quartz sand hydraulic classification device according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1, feeding a mixture of quartz sands of different particle sizes into the grading tank (1) through the feed port (11) at the top thereof, and causing the mixture to fall into the innermost grading space (21) of the grading inner tank (2); S2, start the hydraulic system, inject water through the water inlet (12) corresponding to each grading space (21) on the grading tank (1), and ensure that the water pressure in the grading space (21) from the previous level to the next level shows a gradually decreasing trend; S3, the quartz sand with a gravity greater than its buoyancy settles to the bottom and is discharged from the discharge port (13), while the quartz sand with a gravity less than its buoyancy flows into the next level of classification space (21) with the water flow, until the quartz sand is classified from large to small.

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