Circulating sand screening device

Abstract

The invention belongs to the technical field of constructional engineering, and particularly relates to a circulating sand screening device which comprises a vibrating screen, a screening box and a circulating feeding unit, a coarse material outlet is formed in one side wall of the screening box, the vibrating screen is obliquely fixed in the screening box, and the coarse material outlet is located at the lower end of the vibrating screen in the inclination direction; the circulating feeding unit is composed of a material guide plate, a first conveying belt, a driving assembly and a plurality of material carrying plates. The material guide plate is obliquely arranged in the screening box, and the inclination direction of the material guide plate is opposite to that of the vibrating screen. The first conveying belt is installed on one side of the coarse material outlet in the height direction of the screening box, the multiple material carrying plates are obliquely fixed to the belt face of the first conveying belt at equal intervals, the lower ends of the material carrying plates in the oblique direction are attached to the side wall of the screening box when rotating to the side close to the screening box, and the output end of the driving assembly is connected with the first conveying belt. According to the device, sand flowing out of the coarse material outlet can be circularly conveyed to the vibrating screen, it is guaranteed that caked sand is dispersed and screened, and the sand yield of fine sand is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and particularly relates to a circulating sand screening device. Background Art

[0002] Sand is an indispensable building block in the construction and mining industries. Its quality and particle size distribution crucially impact the strength of concrete, the performance of mortar, and the quality of other building materials. Therefore, sand screening is a critical step in the sand processing process. Sand particles are also classified into different grades, and different uses require different particle sizes. Therefore, sand screening is necessary before use.

[0003] Existing sand screening devices often use a single-layer fixed screen for screening, and a vibration device is set between the screen and the frame. When in use, the screen is in an inclined state, and the sand to be screened is poured onto the screen from the upper end of the inclined direction manually or mechanically, and then the vibration of the screen and the rolling effect of the sand are used to screen out coarse sand and fine sand on the screen.

[0004] However, construction sites are generally outdoors, with sand piled in the open air. The sand inside the sand pile is prone to agglomeration due to high humidity or the presence of rainwater after rain. During the sand screening process, the above-mentioned devices can vibrate to disperse the agglomerated sand to a certain extent. However, for sand lumps with larger volume or higher viscosity, they will slide off the screen before they can be completely dispersed when poured onto the screen, resulting in fine sand easily mixed into the coarse sand. The separation of coarse sand and fine sand is not thorough enough, and the output rate of fine sand is not high, resulting in waste. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a circulating sand screening device that can circulate the sand flowing out of the coarse material outlet to the vibrating screen for repeated screening, ensuring that the agglomerated sand can be fully screened and improving the sand output rate of fine sand.

[0006] The technical solution of the present invention is:

[0007] A circulating sand screening device, comprising a vibrating screen, and further comprising:

[0008] A screening box is provided with a feed inlet on its upper side, a coarse material outlet is provided on a side wall adjacent to the feed inlet, the vibrating screen is fixed obliquely inside the screening box, the coarse material outlet is located at the lower end of the vibrating screen in the oblique direction, and the screening box is provided with a notch on the upper side of the coarse material outlet;

[0009] The circulating feeding unit includes a material guide plate, a first conveyor belt, a driving assembly and multiple material carrying plates. The material guide plate is tiltedly arranged in the screening box and one end is fixedly connected to the bottom wall of the notch, and the tilt direction of the material guide plate is opposite to the tilt direction of the vibrating screen; the first conveyor belt is installed on one side of the coarse material outlet, and the transmission direction of the first conveyor belt is along the height direction of the screening box. Multiple material carrying plates are fixed on the belt surface of the first conveyor belt at equal distances along the transmission direction of the first conveyor belt. The material carrying plate is tilted, and the lower end of the material carrying plate in the tilt direction is in contact with the side wall of the screening box when it turns to the side close to the screening box. The output end of the driving assembly is connected to the first conveyor belt for driving the first conveyor belt to operate.

[0010] Preferably, a distance is provided between the coarse material outlet and the bottom wall of the screening box, and the distance between two adjacent material loading plates is smaller than the distance between the coarse material outlet and the bottom wall of the screening box.

[0011] Preferably, the moving assembly includes:

[0012] A rotating part, fixedly connected to the screening box, wherein the rotating part has an output shaft;

[0013] A plurality of transmission rollers are evenly arranged along the height direction of the screening box, the first conveyor belt is wrapped around the plurality of transmission rollers, and one of the transmission rollers is fixedly connected to the output shaft;

[0014] The sprocket chain set is arranged between the plurality of transmission rollers and the first conveyor belt, and is used to enable the two transmission rollers to drive the first conveyor belt to operate.

[0015] Preferably, a first rotating shaft is provided at the coarse material outlet, the first rotating shaft is arranged along the width direction of the coarse material outlet and both ends are rotatably connected to the side wall of the screening box, one end of the first rotating shaft passes through the side wall of the screening box and is connected to the output shaft of the rotating part through a first transmission part, the first transmission part is used to realize the rotating part driving the first rotating shaft to rotate, and the first rotating shaft is located on the side wall inside the coarse material outlet and has multiple crushing teeth evenly distributed.

[0016] Preferably, a plurality of screening buckets are connected to the first conveyor belt, and the plurality of screening buckets correspond one-to-one to the plurality of loading plates, and the screening buckets are located in front of the running direction of the loading plates, and filter holes are provided on the side walls of the screening buckets, and the aperture of the filter holes is larger than the mesh aperture of the vibrating screen, and the screening buckets turn away from the side wall of the first conveyor belt to the side facing the screening box and fit into the side wall of the screening box.

[0017] Preferably, the inner side of the bottom wall of the screening bucket is also inclined, and the lower end of the inclined direction is away from the first conveyor belt.

[0018] Preferably, a baffle is provided on both sides of the width direction of the first conveyor belt, the two baffles are fixedly connected to the screening box, and the baffles are fitted and rotatably connected to the transmission rollers at corresponding positions, and the two ends of the loading plate are respectively fitted with the two baffles.

[0019] Preferably, one of the baffles is provided with a groove on the side wall facing the first conveyor belt, and the groove is fixed with a rack near the side wall of the screening box, and the rack is located on the upper side of the coarse material outlet, and a plurality of transmission gears are provided to match the rack, and each of the transmission gears is connected to a second rotating shaft, and the plurality of second rotating shafts correspond one-to-one to the plurality of screening buckets, and the second rotating shafts are inserted into the corresponding screening buckets, and a plurality of stirring rods are evenly distributed on the side wall of the second rotating shaft located in the screening bucket.

[0020] Preferably, a plurality of feed plates are arranged in sequence along the height direction between the coarse material outlet and the guide plate, and a spacing is provided between two adjacent feed plates. The feed plates are all inclined, and the lower end of the feed plate in the inclined direction is placed on the upper side of the vibrating screen. The upper end of the feed plate in the inclined direction is fixedly connected to the side wall where the coarse material outlet is located, and the side wall of the screening box is provided with a feed port at the upper end of each feed plate.

[0021] Preferably, the bottom wall of the screening box is closed, and the side wall of the screening box opposite to the coarse material outlet is open. The screening box is provided with a second conveyor belt on the inner side of the bottom wall. The second conveyor belt is used to output the fine sand screened on the lower side of the vibrating screen. The second conveyor belt is connected to the rotating part through a second transmission part, and the second transmission part is used to enable the rotating part to drive the second conveyor belt to operate.

[0022] Compared with the prior art, the circulating sand screening device of the present invention has the following beneficial effects:

[0023] The coarse sand and the agglomerated sand are then discharged from the vibrating screen through the guide plate and the screening machine is used to separate the coarse sand and the agglomerated sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the overall structure of the first viewing angle in an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the overall structure of the second viewing angle in an embodiment of the present invention;

[0026] Figure 3 A longitudinal sectional view of the overall structure in an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the structure of the circulating feeding unit in an embodiment of the present invention;

[0028] Figure 5 This is a schematic structural diagram of a screening bucket in an embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the coordination structure of the rack and the transmission gear in an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the matching structure between the end cover and the first conveyor belt in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Vibrating screen; 2. Screening box; 3. Coarse material outlet; 4. Notch; 5. Guide plate; 6. First conveyor belt; 7. Drive assembly; 71. Rotating part; 72. Drive roller; 73. Sprocket chain assembly; 74. End cover; 8. Loading plate; 9. First rotating shaft; 10. Crushing teeth; 11. First transmission part; 111. Drive shaft; 112. First gear; 113. Second gear; 114. Pulley; 115. Belt; 12. Screening bucket; 13. Filter hole; 14. Baffle; 15. Groove; 16. Rack; 17. Transmission gear; 18. Second rotating shaft; 19. Agitator rod; 20. Feed plate; 21. Second conveyor belt; 22. Second transmission part. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0035] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] See also Figures 1 to 7 As shown, in order to improve the sand output rate of fine sand during the sand screening process and avoid wasting sand and increasing construction costs. This embodiment provides a circulating sand screening device, including a vibrating screen 1, a screening box 2 and a circulating feeding unit. The upper side of the screening box 2 is open and serves as the feed port of the screening box 2. A coarse material outlet 3 is provided on a side wall adjacent to the feed port. The vibrating screen 1 is fixed obliquely inside the screening box 2, and the coarse material outlet 3 is located at the lower end of the vibrating screen 1 in the oblique direction. A notch 4 is provided on the upper side of the screening box 2 at the coarse material outlet 3. The circulating feeding unit includes a guide plate 5, a first conveyor belt 6, a drive assembly 7 and a plurality of loading plates 8. The guide plate 5 is obliquely arranged inside the screening box 2. One end is fixedly connected to the bottom wall of the notch 4, and the inclination direction of the guide plate 5 is opposite to the inclination direction of the vibrating screen 1; the first conveyor belt 6 is installed on one side of the coarse material outlet 3, and the transmission direction of the first conveyor belt 6 is along the height direction of the screening box 2, and a plurality of loading plates 8 are fixed on the belt surface of the first conveyor belt 6 at equal distances along the transmission direction of the first conveyor belt 6. The loading plates 8 are arranged at an angle, and the lower end of the loading plates 8 in the inclination direction is in contact with the side wall of the screening box 2 when it turns to the side close to the screening box 2. The output end of the driving assembly 7 is connected to the first conveyor belt 6 for driving the first conveyor belt 6 to operate.

[0037] Specifically, in the sand screening process, after the sand is initially screened by the vibrating screen 1, the fine sand passes through the vibrating screen 1, and the coarse sand and the agglomerated sand that is not completely screened are discharged from the coarse material outlet 3. At this time, when the coarse sand and the agglomerated sand flow out of the coarse material outlet 3, they will fall on the loading plate 8 on the lower side of the coarse material outlet 3. The height difference between the coarse material outlet 3 and the loading plate 8 will cause a certain dispersion effect on the agglomerated sand, and then the loading plate 8 will push the agglomerated sand under the drive of the first conveyor belt 6. The coarse sand and the agglomerated sand pass through the coarse material outlet 3 until they reach the position of the notch 4, and then the inclination of the loading plate 8 is used to make the coarse sand and the agglomerated sand pass through the guide plate 5 and reach the vibrating screen 1 again for screening, so that the first conveyor belt 6 and the plurality of loading plates 8 can cooperate to continuously and reciprocally transport the coarse sand and agglomerated sand discharged from the coarse material outlet 3 to the vibrating screen 1 for multiple screenings, which can fully screen the agglomerated sand and the fine sand mixed in the coarse sand, thereby improving the sand discharge rate of the fine sand.

[0038] See also Figures 3 to 5As shown, further, in order to ensure that the coarse sand and agglomerated sand discharged from the coarse material outlet 3 can be fully pushed by the loading plate 8 to the guide plate 5 for secondary screening. It is better to design a certain distance between the coarse material outlet 3 and the bottom wall of the screening box 2, and the distance between two adjacent loading plates 8 is smaller than the distance between the coarse material outlet 3 and the bottom wall of the screening box 2. Thereby, in the process of the first conveyor belt 6 driving the multiple loading plates 8 to operate, it can be ensured that each loading plate 8 can fully receive the sand when it reaches the lower end of the coarse material outlet 3. Furthermore, in order to prevent sand from overflowing from both sides of the loading plate 8, a baffle 14 is provided on both sides of the width direction of the first conveyor belt 6. The two baffles 14 are both fixedly connected to the screening box 2, and the two ends of the loading plate 8 are respectively fitted with the two baffles 14.

[0039] See also Figures 1 to 3 As shown, the drive assembly 7 includes a rotating portion 71, multiple transmission rollers 72, a sprocket chain assembly 73, and an end cap 74 for limiting the position of the conveyor belt. The multiple transmission rollers 72 are evenly arranged along the height direction of the screening box 2, and both ends of each transmission roller 72 are rotatably connected to the baffle 14 on the corresponding side, realizing an indirect rotational connection between the transmission roller 72 and the screening box 2, thereby wrapping the first conveyor belt 6 around the multiple transmission rollers 72; the sprocket chain assembly 73 is composed of multiple sprockets and chains, and the multiple sprockets correspond to the multiple transmission rollers 72 one by one. The sprockets are fixed to the corresponding transmission rollers 72, and the chains are fixed around the inner belt surface of the first conveyor belt 6 and mesh with the multiple sprockets. The rotating portion 71 uses a servo motor and is fixed to the baffle 14. The rotating portion 71 has an output shaft, and one of the transmission rollers 72 is fixed to the output shaft of the rotating portion 71. Furthermore, in order to ensure that the meshing transmission between the chain and the sprocket remains stable, two end caps 74 are clamped on both sides of the first conveyor belt 6 in the width direction. The end caps 74 are fitted with the drive roller 72, and the outer side of the end caps 74 is fixed to the baffle 14 on the side where they are located. The inner side of the end caps 74 surrounds the edge of the first conveyor belt 6 to achieve offset limiting of the first conveyor belt 6, ensuring that the chain and the multiple sprockets are always in a meshing state. In addition, in order to ensure the meshing stability of the chain and each sprocket, it is preferable to open an annular groove on the inner wall of the end cap 74 along the running direction of the first conveyor belt 6. A stabilizing rod is slidably connected in the annular groove. The end of the stabilizing rod away from the end cap 74 is fixed to the chain, thereby positioning the distance between the chain and the sprocket, so that the chain can maintain good meshing with each sprocket during rotation.

[0040] See also Figure 3As shown, further, in order to allow the agglomerated sand to be fully dispersed during the secondary screening and improve the screening effect, a first rotating shaft 9 is provided at the coarse material outlet 3. The first rotating shaft 9 is arranged along the width direction of the coarse material outlet 3 and both ends are rotatably connected to the side wall of the screening box 2. One end of the first rotating shaft 9 passes through the side wall of the screening box 2 and is connected to the output shaft of the rotating part 71 through the first transmission part 11. The first transmission part 11 is used to realize that the rotating part 71 drives the first rotating shaft 9 to rotate. The first rotating shaft 9 is located on the side wall inside the coarse material outlet 3 and is evenly distributed with a plurality of crushing teeth 10. Figure 2 As shown, it is preferred that the first transmission part 11 includes a transmission shaft 111, a first gear 112, a second gear 113, a pulley 114 and a belt 115. The transmission shaft 111 is parallel to the output shaft of the rotating part 71 and is rotatably connected to the screening box 2. The first gear 112 and the second gear 113 are respectively mounted on a transmission roller 72 and the transmission shaft 111. The first gear 112 and the second gear 113 are meshed, and then two pulleys 114 are provided. The two pulleys 114 are respectively mounted on the transmission shaft 111 and the first rotating shaft 9, and the two pulleys 114 are connected by a belt 115.

[0041] When in use, the rotating part 71 drives the transmission roller 72, so that the transmission roller 72 drives the first gear 112 and the second gear 113 to mesh, thereby realizing the rotation of the transmission shaft 111. Due to the cooperation of the first gear 112 and the second gear 113, the transmission shaft 111 rotates in the opposite direction of the transmission roller 72, and then the cooperation of the pulley 114 and the belt 115 is used to rotate the first rotating shaft 9, and the first rotating shaft 9 keeps the rotation direction consistent with that of the transmission shaft 111, and then the first rotating shaft 9 drives the crushing teeth 10 to rotate at the coarse material outlet 3, so that under the action of the crushing teeth 10, not only can the material reaching the coarse material outlet 3 be discharged quickly, but also the agglomerated sand can be crushed, so that the agglomerated sand is fully dispersed and discharged from the coarse material outlet 3, and pushed to the guide plate 5 through the loading plate 8, and then the dispersed agglomerated sand and coarse sand are transported to the vibrating screen 1 again through the guide plate 5 for screening, which can fully screen out the fine sand.

[0042] See also Figures 1 to 5As shown, further, in order to better push the material discharged from the coarse material outlet 3 onto the guide plate 5, the pushing amount can be increased while the fine sand mixed in the coarse sand can be better screened out, and at the same time, the material can be prevented from accumulating at the coarse material outlet 3 and affecting the screening progress. A plurality of screening buckets 12 are connected to the first conveyor belt 6. The plurality of screening buckets 12 correspond one-to-one to the plurality of loading plates 8, and the screening buckets 12 are located at the front side of the running direction of the loading plates 8. The side walls of the screening buckets 12 are provided with filter holes 13. The aperture of the filter holes 13 is greater than or equal to the mesh aperture of the vibrating screen 1. The screening bucket 12 is turned away from the side wall of the first conveyor belt to the side facing the screening box 2 and fits with the side wall of the screening box 2. Furthermore, the inner side of the bottom wall of the screening bucket 12 is also inclined, and the lower end of the inclined direction is away from the first conveyor belt 6. When in use, the screening bucket 12 can receive coarse sand, agglomerated sand and other materials flowing out of the coarse material outlet 3. At this time, the screening bucket 12 will achieve a larger carrying capacity than the loading plate 8. At this time, the mechanical vibration of the device itself is utilized or a vibrator is loaded on the baffle 14, so that the screening bucket 12 further pre-screens the sand received from the coarse material outlet 3 through the filter hole 13, and a part of the sand smaller than the filter hole 13 falls on the loading plate 8, and is pushed to the guide plate 5 through the loading plate 8. A part of the sand directly reaches the guide plate 5 from the filter hole 13 close to the side wall of the screening box 2, while the larger sand is directly taken away by the screening bucket 12 and discharged from the other side of the other first conveyor belt 6 for collection and processing, while also avoiding blockage of the coarse material outlet 3.

[0043] See also Figure 3 、 Figure 4 and Figure 6 As shown, further, in order to allow the sand material contained in the screening bucket 12 to be fully screened, the fine sand mixed in the coarse sand can be fully screened out and returned to the vibrating screen 1. A groove 15 is provided on the side wall of one of the baffles 14 facing the first conveyor belt 6. A rack 16 is fixedly connected to the side wall of the groove 15 near the screening box 2. The rack 16 is located on the upper side of the coarse material outlet 3. A plurality of transmission gears 17 are adapted to the rack 16. Each transmission gear 17 is connected to a second rotating shaft 18. The plurality of second rotating shafts 18 correspond to the plurality of screening buckets 12 one by one. The second rotating shafts 18 are inserted into the corresponding screening buckets 12, and a plurality of stirring rods 19 are evenly distributed on the side wall of the second rotating shaft 18 located in the screening bucket 12. During use, when the screening bucket 12 runs to a position higher than the coarse material outlet 3, the transmission gear 17 is engaged with the rack 16, so that the second rotating shaft 18 drives the stirring rod 19 to stir the sand material in the screening bucket 12, which can not only disperse the agglomerated sand more fully, but also allow the fine sand to fully flow out of the filter hole 13, so that it can pass through the guide plate 5 again and enter the vibrating screen 1 for secondary screening, so that the fine sand can be fully screened out, thereby improving the sand discharge rate of fine sand.

[0044] See also Figure 3As shown, further, in order to allow the sand that is smaller than the filter hole 13 screened out in the screening bucket 12 to be quickly discharged and returned to the vibrating screen 1, and to achieve sufficient screening and improve screening efficiency, a plurality of feed plates 20 are arranged in sequence along the height direction between the coarse material outlet 3 and the guide plate 5, with a spacing between two adjacent feed plates 20. The feed plates 20 are all inclined, and the lower end of the feed plate 20 in the inclined direction is placed on the upper side of the vibrating screen 1, and the upper end of the feed plate 20 in the inclined direction is fixedly connected to the side wall where the coarse material outlet 3 is located, and the side wall of the screening box 2 is located at the upper end of each feed plate 20 with a feed inlet. During use, the sand in the screening bucket 12 is stirred by the stirring rod 19, and the sand smaller than the filter hole 13 is guided from the feed plate 20 at different positions to the vibrating screen 1 for screening. On the one hand, the screening effect of coarse and fine sand in the screening bucket 12 can be improved, and on the other hand, the sand flowing out of the filter hole 13 of the screening bucket 12 can be evenly returned to the vibrating screen 1, so that the vibrating screen 1 can quickly and fully perform secondary screening, with better screening effect and higher efficiency.

[0045] See also Figure 3 As shown, further, in order to separate the screened fine sand from the coarse sand further, and also to avoid excessive accumulation of fine sand on the lower side of the vibrating screen 1 and affecting the screening effect of the coarse and fine sand, the bottom wall of the screening box 2 is closed, and the side wall of the screening box 2 opposite to the coarse material outlet 3 is open. The screening box 2 is provided with a second conveyor belt 21 on the inner side of the bottom wall. The second conveyor belt 21 is used to output the fine sand screened on the lower side of the vibrating screen 1. The second conveyor belt 21 is connected to the rotating part 71 through the second transmission part 22. The second transmission part 22 is used to realize that the rotating part 71 drives the second conveyor belt 21 to operate. Preferably, the second transmission part 22 has the same structure as the first transmission part 11, and shares a rotating part 71 through the connection of the transmission shaft 111. During installation, one of the transmission rollers 72 in the second transmission part 22 is coaxially arranged with the transmission shaft 111 and the two are fixed, so that during use, the second transmission part 22 and the transmission roller 72 in the first transmission part 11 rotate synchronously through the cooperation of the first gear 112 and the second gear 113, and then the second transmission part 22 drives the second conveyor belt 21 to operate horizontally at the bottom of the vibrating screen 1, so that the screened fine sand can be output from the side of the screening box 2 away from the coarse material outlet 3 in time, avoiding the contact of the top of the vibrating screen 1 with the vibrating screen 1 after excessive accumulation of fine sand, which affects the screening progress. The structure is simple and easy to use.

[0046] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A circulating sand screening device, comprising a vibrating screen (1), characterized in that: Also includes: The screening box (2) is provided with a feed inlet on its upper side, and a coarse material outlet (3) is provided on a side wall adjacent to the feed inlet. The vibrating screen (1) is fixed obliquely inside the screening box (2), the coarse material outlet (3) is located at the lower end of the vibrating screen (1) in an oblique direction, and the screening box (2) is provided with a notch (4) on the upper side of the coarse material outlet (3); The circulating feeding unit comprises a material guide plate (5), a first conveyor belt (6), a driving assembly (7) and a plurality of material carrying plates (8), wherein the material guide plate (5) is tiltedly arranged in the screening box (2) and one end is fixedly connected to the bottom wall of the notch (4), and the tilt direction of the material guide plate (5) is opposite to the tilt direction of the vibrating screen (1); the first conveyor belt (6) is installed on one side of the coarse material outlet (3), and the transmission direction of the first conveyor belt (6) is along the height direction of the screening box (2); a plurality of material carrying plates (8) are fixed on the belt surface of the first conveyor belt (6) at equal distances along the transmission direction of the first conveyor belt (6); the material carrying plate (8) is tiltedly arranged, and the lower end of the material carrying plate (8) in the tilt direction is in contact with the side wall of the screening box (2) when it turns to the side close to the screening box (2); the output end of the driving assembly (7) is connected to the first conveyor belt (6) for driving the first conveyor belt (6) to operate.

2. A circulating sand screening device according to claim 1, characterized in that: A distance is provided between the coarse material outlet (3) and the bottom wall of the screening box (2), and the distance between two adjacent material loading plates (8) is smaller than the distance between the coarse material outlet (3) and the bottom wall of the screening box (2).

3. A circulating sand screening device according to claim 1, characterized in that: The drive assembly (7) comprises: A rotating part (71) is fixedly connected to the screening box (2), and the rotating part (71) has an output shaft; A plurality of transmission rollers (72) are evenly arranged along the height direction of the screening box (2); the first conveyor belt (6) is wrapped around the plurality of transmission rollers (72); one of the transmission rollers (72) is fixedly connected to the output shaft; The sprocket chain group (73) is arranged between the plurality of transmission rollers (72) and the first conveyor belt (6) and is used to enable the two transmission rollers (72) to drive the first conveyor belt (6) to operate.

4. A circulating sand screening device according to claim 3, characterized in that: A first rotating shaft (9) is provided at the coarse material outlet (3), the first rotating shaft (9) is arranged along the width direction of the coarse material outlet (3) and both ends are rotatably connected to the side wall of the screening box (2), one end of the first rotating shaft (9) passes through the side wall of the screening box (2) and is connected to the output shaft of the rotating part (71) through the first transmission part (11), the first transmission part (11) is used to realize the rotating part (71) driving the first rotating shaft (9) to rotate, and a plurality of crushing teeth (10) are evenly distributed on the side wall of the first rotating shaft (9) inside the coarse material outlet (3).

5. A circulating sand screening device according to claim 3, characterized in that: A plurality of screening buckets (12) are connected to the first conveyor belt (6), and the plurality of screening buckets (12) correspond to the plurality of loading plates (8) one by one, and the screening buckets (12) are located in front of the running direction of the loading plates (8). The side walls of the screening buckets (12) are provided with filter holes (13), and the aperture of the filter holes (13) is larger than the mesh aperture of the vibrating screen (1). The screening buckets (12) are turned away from the side wall of the first conveyor belt to the side facing the screening box (2) and are in contact with the side wall of the screening box (2).

6. A circulating sand screening device according to claim 5, characterized in that: The inner side of the bottom wall of the screening bucket (12) is also inclined, and the lower end of the inclined direction is away from the first conveyor belt (6).

7. The circulating sand screening device according to claim 5, characterized in that: A baffle (14) is provided on each side of the width direction of the first conveyor belt (6), and the two baffles (14) are fixedly connected to the screening box (2). The baffles (14) are fitted and rotatably connected to the transmission rollers (72) at corresponding positions, and the two ends of the loading plate (8) are respectively fitted with the two baffles (14).

8. A circulating sand screening device according to claim 7, characterized in that: One of the baffles (14) is provided with a groove (15) on the side wall facing the first conveyor belt (6), and the groove (15) is fixed with a rack (16) near the side wall of the screening box (2), and the rack (16) is located on the upper side of the coarse material outlet (3). The rack (16) is adapted to be provided with a plurality of transmission gears (17), and each of the transmission gears (17) is connected to a second rotating shaft (18). The plurality of second rotating shafts (18) correspond to the plurality of screening buckets (12) one by one, and the second rotating shafts (18) are inserted into the corresponding screening buckets (12), and the second rotating shafts (18) are located on the side wall of the screening bucket (12) and are evenly distributed with a plurality of stirring rods (19).

9. The circulating sand screening device according to claim 1, characterized in that: A plurality of feed plates (20) are arranged in sequence along the height direction between the coarse material outlet (3) and the guide plate (5), and a spacing is provided between two adjacent feed plates (20). The feed plates (20) are all arranged in an inclined manner, and the lower end of the feed plate (20) in the inclined direction is placed on the upper side of the vibrating screen (1). The upper end of the feed plate (20) in the inclined direction is fixedly connected to the side wall where the coarse material outlet (3) is located, and the side wall of the screening box (2) is provided with a feed inlet at the upper end of each feed plate (20).

10. The circulating sand screening device according to claim 5, characterized in that: The bottom wall of the screening box (2) is closed, and the side wall of the screening box (2) opposite to the coarse material outlet (3) is opened. The screening box (2) is provided with a second conveyor belt (21) on the inner side of the bottom wall. The second conveyor belt (21) is used to output the fine sand screened on the lower side of the vibrating screen (1). The second conveyor belt (21) is connected to the rotating part (71) through a second transmission part (22). The second transmission part (22) is used to enable the rotating part (71) to drive the second conveyor belt (21) to operate.

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