Multi-stage sandstone raw material screening device

Abstract

The present application relates to the technical field of screening equipment, and particularly relates to a sand raw material multi-stage screening device, which comprises a horizontal cylinder, a feeding channel connected and installed at the top of the horizontal cylinder and used for feeding, a discharging channel connected and installed at the bottom of the horizontal cylinder and used for discharging, and two sieve plates arranged in the horizontal cylinder and used for screening materials, the axis of the sieve plate is coaxial with the axis of the horizontal cylinder and is horizontal, the shape of the sieve plate is conical, the cross section of the conical surface of the sieve plate in the vertical direction is wavy, and each sieve plate is provided with a discharging pipe; through the design of the unique sieve plate and the wavy shape thereon, combined with the feature that the sieve hole size gradually increases along the direction towards the axis of the sieve plate, efficient multi-stage screening of sand raw materials is realized, meanwhile, the built-in air blowing unit can effectively clean the sieve hole blockage, ensure the continuity and stability of the screening process, and significantly improve the production efficiency.

Description

Multi-stage screening equipment for raw sand and gravel Technical Field

[0001] This invention relates to the technical field of screening equipment, and in particular to multi-stage screening equipment for raw sand and gravel. Background Technology

[0002] As a crucial raw material for infrastructure construction, the quality of sand and gravel directly affects the stability and durability of buildings. The particle size distribution of sand and gravel directly influences the mix proportions and performance of concrete; therefore, efficient screening technology is a key step in ensuring the quality of sand and gravel.

[0003] In recent years, with the advancement of technology, multi-stage screening equipment has gradually become the mainstream in the sand and gravel processing industry. This type of equipment usually includes multiple screening layers, with each layer having a specific screen set according to different particle size ranges, thereby achieving precise material classification. However, this type of equipment also has many drawbacks. For example, when screening sand and gravel, the sand and gravel can easily clog the screen, causing the equipment to be unable to operate continuously for a long time, affecting production efficiency. At the same time, because multiple screening layers need to be set up, the equipment is large in size and occupies a lot of space. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a multi-stage screening equipment for raw sand and gravel, the specific technical solution of which is as follows:

[0005] A multi-stage screening equipment for raw sand and gravel includes a horizontal cylinder, a feed channel connected to the top of the horizontal cylinder for feeding, a discharge channel connected to the bottom of the horizontal cylinder for discharging, and two screen plates disposed inside the horizontal cylinder for screening materials. The axis of the screen plates is coaxial with and horizontal to the axis of the horizontal cylinder. The screen plates are conical in shape, and the cross-section of the conical surface of the screen plates in the vertical direction is wavy. Each screen plate is equipped with a discharge pipe that is inclined downwards, and the screen plate rotates on the discharge pipe. Two first baffles are provided between the two screen plates, and the two first baffles divide the space between the two screen plates into an upper screening area and a lower cleaning area.

[0006] The screen plate has a gradually increasing screen hole size along the direction of the screen plate axis, so as to perform multi-stage screening of raw materials through screen holes of different sizes. The screen plate is equipped with an air blowing unit for back impacting part of the screen plate in the cleaning area. The air blowing unit can clear the raw materials blocked on the screen plate. The cleaned raw materials are discharged through the discharge channel. Two discharge pipes are connected between two screen plates, and an opening is opened at the top of the connection position of the two discharge pipes.

[0007] Furthermore, each sieve plate is equipped with a sealing plate, and the sieve plate rotates on the sealing plate. The sealing plate and the sieve plate form a closed space. The discharge pipe passes through the sealing plate and is fixedly connected. The sealing plate is equipped with two second baffles corresponding to the two first baffles. The two second baffles divide the internal space of the sieve plate into an upper chamber and a lower chamber. The upper chamber corresponds to the screening area of ​​the sieve plate, and the lower chamber corresponds to the cleaning area of ​​the sieve plate. Multiple third baffles are provided in the upper chamber, which divides the upper chamber into multiple collection areas. Various raw materials that have been graded and screened through the sieve holes on the sieve plate enter the multiple collection areas respectively.

[0008] The first baffle and the second baffle are both fixed on the sealing plate, and the sieve plate rotates on the sealing plate.

[0009] Furthermore, a long platform is inserted on the sealing plate. One end of the long platform extends horizontally to the bottom of the two second baffles, and the other end of the long platform extends to the outside of the sealing plate. Multiple diversion channels are opened inside the long platform, and the multiple diversion channels are respectively connected to multiple collection areas.

[0010] Furthermore, multiple ridges are provided on the inner wall of the horizontal cylinder along the axis of the horizontal cylinder, and a sliding groove is provided on the outer circumference of the sealing plate. The sliding groove is slidably installed on the ridge. When the sealing plate moves back and forth on the inner wall of the horizontal cylinder along the axis of the horizontal cylinder, the screen plate can be in a vibrating state.

[0011] Furthermore, the front and rear sides of the cross cylinder are provided with fixing grooves, which are connected to the inside of the cross cylinder. The sealing plate is provided with a process groove, which exposes part of the screen plate. Each fixing groove is provided with a rotating transmission column, which makes transmission contact with part of the screen plate in the process groove. Each transmission column is equipped with a motor, which provides power to the transmission column. The motor is fixed on the discharge channel.

[0012] Furthermore, the output end of the motor is eccentrically provided with an eccentric disk, and a rotating sleeve is rotatably mounted on the eccentric disk. The rotating sleeve is connected to the sealing disk by a push-pull rod.

[0013] Furthermore, a cover plate is provided on the process groove of the sealing plate, and the cover plate is slidably fastened to the fixed groove.

[0014] Furthermore, the air-blowing unit includes an air pump installed on the side wall of the sealing plate. Both the input and output ends of the air pump are connected to air pipes. One air pipe is connected to the upper chamber inside the sieve plate through a breathable screen, and the other air pipe is connected to the lower chamber inside the sieve plate.

[0015] The advantages of this invention are:

[0016] By designing a unique sieve plate with a wavy shape, and combining the feature that the sieve hole size gradually increases along the direction of the sieve plate axis, efficient multi-stage screening of sand and gravel raw materials is achieved. At the same time, the built-in air blowing unit can effectively clear sieve hole blockage, ensuring the continuity and stability of the screening process and significantly improving production efficiency.

[0017] The use of a conical and corrugated cross-section design for the sieve plate not only extends the screening path of the raw materials but also reduces the overall size of the equipment. At the same time, it slows down the rolling speed of the raw materials, making the screening equipment more compact and saving valuable space, which is especially important for factories with limited space.

[0018] The rotating design of the screen plate allows the blocked raw material to be automatically moved to the cleaning zone. Combined with the counter-impact of the air blowing unit, a dynamic balance is achieved between the screening and cleaning processes. When the screen plate cleaning zone is being cleaned, the screening area of ​​the screen plate can ensure continuous operation, avoiding production interruptions caused by screen blockage and ensuring continuous operation of the equipment.

[0019] By collecting and re-introducing raw materials that have not been fully screened through the discharge channel, the opportunity for re-screening of raw materials is provided, maximizing the utilization rate of raw materials, reducing waste, and also reducing production costs.

[0020] In summary, this technical solution, through its innovative design, effectively solves the problems of screen clogging and bulky equipment in traditional multi-stage screening equipment, improves screening efficiency and raw material utilization, and achieves the goals of space saving and production continuity. It has significant technical advantages and practical application value. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a schematic diagram of the structure of the present invention;

[0023] Figure 2 is a schematic diagram of the left view structure in Figure 1;

[0024] Figure 3 is a schematic diagram of the structure of the horizontal cylinder, feeding channel and discharging channel in Figure 1;

[0025] Figure 4 is an enlarged schematic diagram of the sealing plate and its structure in Figure 1;

[0026] Figure 5 is a schematic diagram of the cross-sectional structure shown in Figure 4;

[0027] Figure 6 is a schematic diagram of the structure of the sieve plate, the first baffle and the discharge pipe in Figure 4;

[0028] Figure 7 is a structural schematic diagram of a sealing plate and its first baffle in Figure 4;

[0029] Figure 8 is a schematic diagram of the cross-sectional structure shown in Figure 7;

[0030] Figure 9 is an enlarged schematic diagram of the transmission column in Figure 3;

[0031] Marked in the attached diagram:

[0032] 1. Horizontal cylinder; 2. Feed channel; 3. Discharge channel; 4. Screen plate; 5. First baffle; 6. Discharge pipe; 7. Sealing plate; 8. Second baffle; 9. Third baffle; 10. Long platform; 11. Diversion channel; 12. Fixing groove; 13. Transmission column; 14. Motor; 15. Eccentric disc; 16. Rotating sleeve; 17. Push-pull rod; 18. Cover plate; 19. Air pump; 20. Air pipe; 21. Breathable screen. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] In the description of this invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0036] As shown in Figures 1 to 4, the multi-stage screening equipment for raw sand and gravel of the present invention includes a horizontal cylinder 1, a feeding channel 2 connected to the top of the horizontal cylinder 1 for feeding, a discharge channel 3 connected to the bottom of the horizontal cylinder 1 for discharging, and two screen plates 4 disposed inside the horizontal cylinder 1 for screening materials. The axis of the screen plates 4 is coaxial with and horizontal to the axis of the horizontal cylinder 1. The screen plates 4 are conical in shape, and the cross-section of the conical surface of the screen plates 4 in the vertical direction is wavy. Each screen plate 4 is equipped with a discharge pipe 6, which is inclined downward and the screen plates 4 rotate on the discharge pipe 6. Two first baffles 5 are provided between the two screen plates 4, and the two first baffles 5 divide the space between the two screen plates 4 into an upper screening area and a lower cleaning area.

[0037] The screen plate 4 has a screen hole size that gradually increases along the direction of the screen plate 4 axis, so that the raw material can be screened in multiple stages through screen holes of different sizes. The screen plate 4 is provided with an air blowing unit for back impacting part of the screen plate 4 in the cleaning area. The air blowing unit can clean the raw material blocked on the screen plate 4. The cleaned raw material is discharged through the discharge channel 3. Two discharge pipes 6 are connected between the two screen plates 4, and an opening is provided at the top of the connection position of the two discharge pipes 6.

[0038] In detail, the horizontal cylinder 1 supports the feed channel 2 and the discharge channel 3. The feed channel 2 supplies sand and gravel raw materials between the two screen plates 4 inside the horizontal cylinder 1. The discharge channel 3 collects and discharges the raw materials that have fallen off from the cleaning area of ​​the screen plate 4 due to the impact. Since this part of the raw material only blocks the screen holes on the screen plate 4, its shape and volume still meet the screening requirements. Therefore, this part of the raw material can be reintroduced into the horizontal cylinder 1 for repeated screening. The screen plate 4 rotates inside the horizontal cylinder 1. Because the screen plate 4 can rotate, when the raw material blocks the screen holes on the screen plate 4, the screen plate 4 will carry the blocked raw material to the cleaning area of ​​the screen plate 4 for cleaning, thereby ensuring that the screen holes on the screen plate 4 are always open, improving screening efficiency, and facilitating long-term screening operations. The system operates stably. The two first baffles 5 separate the space between the two screen plates 4. When the raw material falls into the discharge channel 3 through the feed channel 2, it can fall directly onto the conical surface of the screen plate 4 between the two first baffles 5. The raw material is then screened through the sieve holes on the conical surface of the screen plate 4. The first baffles 5 are fixed in position. The discharge pipe 6 can be used to support the screen plate 4. The remaining raw material after being screened by the screen plate 4 can enter the discharge pipe 6 through the opening at the docking position between the two discharge pipes 6 and be discharged. This part of the raw material does not meet the screening requirements. It can be seen that the raw material discharged from the discharge channel 3 can be screened again, while the raw material discharged from the discharge pipe 6 cannot be screened again.

[0039] In use, the raw material falls onto the conical surface of the two screen plates 4 through the feed channel 2. The raw material is blocked by the conical surface of the screen plate 4 and the first baffle 5. The raw material rolls down along the conical surface of the screen plate 4 and moves toward the opening between the two discharge pipes 6. During the rolling process of the raw material, the screen holes of different diameters on the screen plate 4 complete multi-stage screening of the raw material. Since the raw material can be screened in multiple stages on the conical surface of the screen plate 4, the size of the equipment can be reduced and the equipment can be made more compact. By using the conical screen plate 4, the movement path of the raw material can be extended while reducing the structural shape, so as to facilitate the full screening of the raw material. At the same time, by making the cross-section of the screen plate 4 wavy, the rolling speed of the raw material on the conical surface can be slowed down, the screening time and screening path can be extended, and the raw material screened by grading on the screen plate 4 can be discharged separately.

[0040] By designing a unique screen plate 4 with its wavy shape, combined with the characteristic that the screen aperture size gradually increases along the axis of screen plate 4, efficient multi-stage screening of sand and gravel raw materials is achieved. Simultaneously, the built-in air blowing unit effectively clears screen aperture blockages, ensuring the continuity and stability of the screening process and significantly improving production efficiency. The conical and wavy cross-section design of screen plate 4 not only extends the screening path of the raw materials but also reduces the overall size of the equipment, while slowing down the rolling speed of the raw materials, making the screening equipment more compact and saving valuable space, which is especially important for factories with limited space. The rotating design of screen plate 4 allows blocked raw materials to be automatically moved to the cleaning area, working in conjunction with the counter-impact effect of the air blowing unit. This technology achieves a dynamic balance between the screening and cleaning processes. During the cleaning of the screen plate 4, the screening area of ​​the screen plate 4 can continue to work, avoiding production interruptions caused by screen blockage and ensuring continuous operation of the equipment. The material discharge channel 3 collects and re-introduces raw materials that have not been fully screened, providing an opportunity for re-screening the raw materials, maximizing the utilization rate of raw materials, reducing waste, and lowering production costs. In summary, this technical solution, through its innovative design, effectively solves the problems of screen blockage and large equipment size in traditional multi-stage screening equipment, improves screening efficiency and raw material utilization, and achieves the goals of space saving and production continuity. It has significant technical advantages and practical application value.

[0041] As shown in Figures 5 to 8, each sieve plate 4 is provided with a sealing plate 7, and the sieve plate 4 rotates on the sealing plate 7. The sealing plate 7 and the sieve plate 4 form a closed space. The discharge pipe 6 passes through the sealing plate 7 and is fixedly connected. The sealing plate 7 is provided with two second baffles 8 corresponding to the two first baffles 5. The two second baffles 8 divide the internal space of the sieve plate 4 into an upper chamber and a lower chamber. The upper chamber corresponds to the screening area of ​​the sieve plate 4, and the lower chamber corresponds to the cleaning area of ​​the sieve plate 4. Multiple third baffles 9 are provided in the upper chamber. The multiple third baffles 9 divide the upper chamber into multiple collection areas. The various raw materials that have been classified and screened by the sieve holes on the sieve plate 4 enter the multiple collection areas respectively.

[0042] The first baffle 5 and the second baffle 8 are both fixed on the sealing plate 7, and the sieve plate 4 rotates on the sealing plate 7.

[0043] In detail, one end of the first baffle 5 is connected to the discharge pipe 6, and the other end of the first baffle 5 is fixedly connected to the edge of the sealing plate 7. The second baffle 8 is fixed on the sealing plate 7, and the sieve plate 4 is located between the first baffle 5 and the second baffle 8. This allows the first baffle 5 and the second baffle 8 to divide the space near the sieve plate 4 in multiple places, and the sieve plate 4 can rotate on the sealing plate 7. When the raw material rolls down on the conical surface of the sieve plate 4 and is screened through sieve holes of different sizes, the separated raw material can fall into different collection areas separated by multiple third baffles 9, thereby realizing the graded collection of raw materials and avoiding mixing of raw materials. At the same time, the setting of the second baffle 8 can prevent the raw material at the screening point from falling into the cleaning area inside the sieve plate 4.

[0044] It should be noted that the front and rear sides of the third baffle 9 are fixedly connected to the two second baffles 8 respectively, the arc-shaped top of the third baffle 9 slides in contact with the inner wall of the sieve plate 4, and the sealing plate 7 provides support for the sieve plate 4.

[0045] As shown in Figure 8, a long platform 10 is inserted on the sealing plate 7. One end of the long platform 10 extends horizontally to the bottom of the two second baffles 8, and the other end of the long platform 10 extends to the outside of the sealing plate 7. Multiple diversion channels 11 are opened in the long platform 10, and the multiple diversion channels 11 are respectively connected to multiple collection areas.

[0046] In detail, when collecting the graded raw materials, the multiple collection zones divided by the multiple third baffles 9 can allow the raw materials to fall naturally down the inclined surface of the second baffle 8 toward the long platform 10. The raw materials on the long platform 10 can be discharged through the corresponding diversion channel 11, thereby realizing the discharge and collection of graded raw materials and facilitating the timely discharge of raw materials from the equipment.

[0047] Multiple ridges are provided on the inner wall of the horizontal cylinder 1 along the axis of the horizontal cylinder 1. A sliding groove is provided on the outer circumference of the sealing plate 7. The sliding groove is slidably installed on the ridge. When the sealing plate 7 moves back and forth on the inner wall of the horizontal cylinder 1 along the axis of the horizontal cylinder 1, the screen plate 4 can be in a vibrating state.

[0048] In detail, the diameter of the screen plate 4 is smaller than the inner diameter of the horizontal cylinder 1, so the screen plate 4 and the horizontal cylinder 1 are separated. The screen plate 4 is installed on the horizontal cylinder 1 by the sealing plate 7. The ridges on the horizontal cylinder 1 and the grooves on the sealing plate 7 can be used to guide the sealing plate 7. When the sealing plate 7 and the screen plate 4 vibrate in the horizontal cylinder 1, the blockage material in the cleaning area of ​​the screen plate 4 can be quickly removed.

[0049] As shown in Figures 1, 3, and 9, the horizontal cylinder 1 has fixed grooves 12 on both its front and rear sides, which are connected to the interior of the horizontal cylinder 1. The sealing plate 7 has a process groove that exposes part of the screen plate 4. Each fixed groove 12 has a rotating transmission column 13 that makes transmission contact with part of the screen plate 4 in the process groove. Each transmission column 13 is equipped with a motor 14 that provides power to the transmission column 13. The motor 14 is fixed on the discharge channel 3.

[0050] In detail, the motor 14 can drive the screen plate 4 on each sealing plate 7 to rotate through the transmission column 13, thereby providing power to the screen plate 4. The process groove on the sealing plate 7 can facilitate the contact between the screen plate 4 and the transmission column 13, avoiding the sealing plate 7 from blocking the screen plate 4. When the sealing plate 7 vibrates left and right, the screen plate 4 can move on the transmission column 13, and the screen plate 4 and the transmission column 13 maintain the transmission state.

[0051] As shown in Figure 9, the output end of the motor 14 is provided with an eccentric disk 15, and a rotating sleeve 16 is rotatably mounted on the eccentric disk 15. The rotating sleeve 16 is connected to the sealing disk 7 by a push-pull rod 17.

[0052] In detail, the output end of the motor 14 is connected to the transmission column 13. An eccentric disk 15 is eccentrically set on the output end of the motor 14, so that the motor 14 can provide power to both the transmission column 13 and the eccentric disk 15 at the same time. One end of the push-pull rod 17 is rotatably mounted on the rotating sleeve 16, and the other end of the push-pull rod 17 is rotatably mounted on the sealing plate 7. When the eccentric disk 15 rotates eccentrically, the eccentric disk 15 can drive the sealing plate 7 to slide inside the horizontal cylinder 1 through the rotating sleeve 16 and the push-pull rod 17, thereby facilitating the vibration of the sealing plate 7 and the screen plate 4.

[0053] In actual use, to avoid the vibration affecting the raw material screening operation of the screening area, the vibration intensity can be adjusted according to actual needs.

[0054] As shown in Figure 7, a cover plate 18 is provided on the process groove of the sealing plate 7, and the cover plate 18 is slidably fastened to the fixed groove 12.

[0055] In detail, by setting the baffle 18, the fixed groove 12 can be easily blocked, thereby preventing the raw materials in the cleaning area from being discharged through the fixed groove 12 on the outside of the two sealing discs 7. This makes it easy to block the fixed groove 12. At the same time, when the sealing disc 7 moves, the sealing disc 7 can drive the baffle 18 to slide on the fixed groove 12, thereby maintaining the blocked state.

[0056] As shown in Figure 1, the air blowing unit includes an air pump 19 installed on the side wall of the sealing plate 7. The input and output ends of the air pump 19 are both connected to air pipes 20. One air pipe 20 is connected to the upper chamber inside the sieve plate 4 through the air-permeable screen 21, and the other air pipe 20 is connected to the lower chamber inside the sieve plate 4.

[0057] In detail, the permeable screen 21 is installed inside the screen plate 4 in the collection area closest to the edge of the screen plate 4. The air pump 19 can extract the air from the collection area and discharge it into the lower chamber through the air pipe 20. The air in the lower chamber can perform a counter-impact aeration treatment on part of the screen plate 4 in the cleaning area, thereby cleaning and removing the raw material on the screen holes through the high-zone airflow. The permeable screen 21 can filter the air entering the air pump 19 and the air pipe 20, thereby intercepting the raw material in the collection area. At the same time, since the air in the collection area enters the air pump 19, the air between the two screen plates 4 can enter the collection area from the outermost edge of the screen plate 4. Thus, the airflow causes the raw material falling in the horizontal cylinder 1 to move towards the top edge of the screen plate 4, which facilitates the drainage treatment of the raw material and allows the raw material to start rolling down along the edge of the screen plate 4.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-stage screening equipment for raw sand and gravel, characterized in that, The system includes a horizontal cylinder (1), a feeding channel (2) connected to the top of the horizontal cylinder (1) for feeding materials, a discharge channel (3) connected to the bottom of the horizontal cylinder (1) for discharging materials, and two screen plates (4) set inside the horizontal cylinder (1) for screening materials. The axis of the screen plates (4) is coaxial with and horizontal to the axis of the horizontal cylinder (1). The screen plates (4) are conical in shape, and the cross-section of the conical surface of the screen plates (4) in the vertical direction is wavy. Each screen plate (4) is equipped with a discharge pipe (6). The discharge pipe (6) is inclined downward, and the screen plate (4) rotates on the discharge pipe (6). Two first baffles (5) are set between the two screen plates (4). The two first baffles (5) separate the two screen plates. (4) The space between them is divided into an upper screening area and a lower cleaning area; wherein, the size of the screen holes on the screen plate (4) gradually increases along the direction towards the axis of the screen plate (4), so that the raw materials are screened in multiple stages through screen holes of different sizes. The screen plate (4) is provided with an air blowing unit for back impacting part of the screen plate (4) in the cleaning area. The air blowing unit can clean the raw materials blocked on the screen plate (4). The cleaned raw materials are discharged through the discharge channel (3). Two discharge pipes (6) are connected between the two screen plates (4), and an opening is provided at the top of the connection position of the two discharge pipes (6). Each screen plate (4) is provided with a sealing plate (7), and the screen plate (4) is on the sealing plate (7). Rotate, the sealing disc (7) and the sieve plate (4) form a closed space, the discharge pipe (6) passes through the sealing disc (7) and is fixedly connected, the sealing disc (7) is provided with two second baffles (8) corresponding to the two first baffles (5), the two second baffles (8) divide the internal space of the sieve plate (4) into an upper chamber and a lower chamber, the upper chamber corresponds to the screening area of ​​the sieve plate (4) and the lower chamber corresponds to the cleaning area of ​​the sieve plate (4), the upper chamber is provided with multiple third baffles (9), the multiple third baffles (9) divide the upper chamber into multiple collection areas, the various raw materials that have been graded and screened by the sieve holes on the sieve plate (4) enter the multiple collection areas respectively; wherein, the first baffle (5) and the second baffle (8) are both fixed on the sealing disc. On the plate (7), the sieve plate (4) rotates on the sealing plate (7); a long platform (10) is inserted on the sealing plate (7), one end of the long platform (10) extends horizontally to the bottom of the two second baffles (8), and the other end of the long platform (10) extends to the outside of the sealing plate (7). Multiple diversion channels (11) are opened in the long platform (10), and the multiple diversion channels (11) are connected to multiple collection areas respectively; multiple ridges are arranged on the inner wall of the horizontal cylinder (1) along the axis of the horizontal cylinder (1), and a sliding groove is opened on the outer circumference of the sealing plate (7). The sliding groove is slidably installed on the ridge. When the sealing plate (7) moves back and forth on the inner wall of the horizontal cylinder (1) along the axis of the horizontal cylinder (1), the sieve plate (4) can be in a vibrating state.

2. The multi-stage screening equipment for raw sand and gravel according to claim 1, characterized in that, The front and rear sides of the horizontal cylinder (1) are provided with fixed grooves (12), which are connected to the interior of the horizontal cylinder (1). The sealing plate (7) is provided with a process groove, which exposes part of the screen plate (4). Each fixed groove (12) is provided with a rotating transmission column (13), which is in transmission contact with part of the screen plate (4) in the process groove. Each transmission column (13) is equipped with a motor (14), which provides power to the transmission column (13). The motor (14) is fixed on the discharge channel (3).

3. The multi-stage screening equipment for raw sand and gravel according to claim 2, characterized in that, The output end of the motor (14) is provided with an eccentric disk (15), and a rotating sleeve (16) is rotatably mounted on the eccentric disk (15). The rotating sleeve (16) is connected to the sealing disk (7) by a push-pull rod (17).

4. The multi-stage screening equipment for raw sand and gravel according to claim 3, characterized in that, A cover plate (18) is provided on the process groove of the sealing plate (7), and the cover plate (18) is slidably fastened on the fixed groove (12).

5. The multi-stage screening equipment for raw sand and gravel according to claim 4, characterized in that, The air-blowing unit includes an air pump (19) installed on the side wall of the sealing plate (7). The input and output ends of the air pump (19) are connected to air pipes (20). One air pipe (20) is connected to the upper chamber of the sieve plate (4) through the air-permeable screen (21), and the other air pipe (20) is connected to the lower chamber of the sieve plate (4).

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