CN111570285A

CN111570285A - Quick sieving mechanism of sand

Info

Publication number: CN111570285A
Application number: CN202010421470.0A
Authority: CN
Inventors: 李永红
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-08-25

Abstract

The invention discloses a sand rapid screening device which comprises a supporting table, wherein a cleaning mechanism is arranged above the supporting table, a collecting mechanism is arranged below the cleaning mechanism, a sand filtering mechanism is arranged above the supporting table, and a sand discharging mechanism is arranged on one side of the sand filtering mechanism. The device has the advantages that the device can automatically clean and collect impurities, manual cleaning of the impurities is not needed, manual labor intensity is reduced, working efficiency is improved, when the arc-shaped screening plate rotates to the upper side, the cleaning shaft can rotate through transmission among the gears, screening mesh on the screening plate is cleaned, mesh blockage is prevented, and working efficiency is improved.

Description

Quick sieving mechanism of sand

Technical Field

The invention relates to the technical field of constructional engineering equipment, in particular to a sand rapid screening device.

Background

In the construction process of a building, sand and other building materials are required to be mixed to form concrete, so that the concrete can be used, the sand generally contains more impurities, and the sand needs to be screened before being used.

Among the prior art, generally place the sand on the screen cloth by the manual work, vibration through the screen cloth, can be on the screen cloth with great impurity interception, fine sand falls in the below after filtering through the screen cloth, thereby use, but it has some problems when using, impurity on the screen cloth is after piling up the certain degree, can influence the screening efficiency of sand, need take out the impurity on the screen cloth by the manual work, influence work efficiency, though can place through the slope of screen cloth, make impurity move to one side under the effect of gravity, but do so and also can lead to containing a small amount of sieve that finishes not screening in the impurity and follow and fall down, cause the waste, it is inconvenient to use, still some sand with screen cloth mesh size is on the screen cloth easily, influence work efficiency.

Disclosure of Invention

Aiming at the defects, the invention provides a sand rapid screening device to solve the problem.

In order to achieve the purpose, the invention adopts the following technical scheme:

a sand rapid screening device comprises a supporting table, a cleaning mechanism is arranged above the supporting table, a collecting mechanism is arranged below the cleaning mechanism, a sand filtering mechanism is arranged above the supporting table, a sand discharging mechanism is arranged on one side of the sand filtering mechanism,

the sand filtering mechanism comprises a hollow sleeve positioned above a supporting table, supporting columns are arranged on two sides of the lower end of the hollow sleeve, the lower ends of the supporting columns are fixedly arranged on the upper surface of the supporting table, a feeding cylinder is arranged in the hollow sleeve, the feeding cylinder and the hollow sleeve concentrically correspond to each other, a plurality of connecting columns are arranged on the outer surface of the feeding cylinder, one ends of the connecting columns are fixedly connected with the inner surface of the feeding cylinder, a discharge port is formed in the lower end of the feeding cylinder, an inclined feeding plate is arranged in the feeding cylinder, an arc-shaped feeding plate is arranged on one side of the inlet end of the feeding cylinder, a supporting rod is arranged at the lower end of the arc-shaped feeding plate, the lower end of the supporting rod is fixedly arranged on the upper surface of the supporting table, a square opening is formed in the lower end of the feeding cylinder, the discharge port, the inner side of each circular ring rotating plate is provided with an annular groove, the annular groove is sleeved on the outer side of a first universal ball, the outer side of each circular ring rotating plate is provided with eight arc-shaped openings, a plurality of second universal balls are arranged in the arc-shaped openings, eight arc-shaped screening plates are arranged between the two circular ring rotating plates, two protection plates are arranged on two sides of each arc-shaped screening plate and are connected through a sector fixing plate, screening openings are formed in the arc-shaped screening plates and the protection plates, screening nets are arranged at the screening openings, a movable plate is arranged on one side of each sector fixing plate, one end of the movable plate extends to the outer side of the circular ring rotating plate through the arc-shaped openings, the sector fixing plate far away from the inlet end,

the sandstone discharging mechanism comprises a fixed table fixedly arranged on one side of the upper surface of a supporting table, a servo motor is arranged on the upper surface of the fixed table, a coupler is arranged at the rotating end of the servo motor, the coupler is connected with a rotating shaft, a first rolling bearing is arranged at one end of the rotating shaft, a fixed rod is arranged at the lower end of the first rolling bearing, the lower end of the fixed rod is fixedly arranged on the upper surface of the fixed table, an eccentric wheel is arranged on the rotating shaft, slide ways are arranged on two sides of the upper surface of the fixed table, supporting blocks are arranged on two sides of the lower end of each slide way, the lower ends of the supporting blocks are fixedly arranged on the fixed table, a moving block is arranged between the two slide ways, sliding blocks are arranged at two ends of the moving block, one end of each sliding, the lower end of the fixed column is fixedly arranged on the upper surface of the fixed table, one side of the rotating rod is provided with a one-way bearing, the outer side of the one-way bearing is provided with a second gear, the second gear is meshed with the first gear, the other side of the rotating rod is provided with a second rolling bearing, the outer side of the second rolling bearing is provided with a first bevel gear, one side of the rotating shaft is provided with a second bevel gear, the second bevel gear is meshed with the first bevel gear, the upper end of the hollow sleeve is provided with an arc-shaped notch.

Furthermore, the circular ring rotating plate is composed of two semicircular plates, a semicircular hole is formed in the circle center position of each semicircular plate, and the two semicircular plates are connected through a bolt.

Furthermore, the surface of one side, close to the moving block, of the moving block is an arc-shaped surface, and a plurality of supporting wheels are mounted on the surface of one side, close to the moving block, of the moving block.

Furthermore, a flexible brush is arranged on the surfaces of the protection plate and one side, close to the hollow sleeve, of the fan-shaped fixing plate.

Further, clearance mechanism includes the cleaning plate of fixed mounting in hollow sleeve upper end both sides, and third antifriction bearing is installed to the inboard surface upper end of cleaning plate, is equipped with the clearance axle between two cleaning plates, and in the third antifriction bearing was inserted at clearance axle both ends, the epaxial flexible clearance brush of installing of clearance, third gear and first gear engagement were installed to clearance axle one side.

Further, the collecting mechanism comprises an inclined table fixedly installed on one side surface of the supporting table, a plurality of semicircular grooves are formed in the upper surface of the supporting table, the collecting box is placed on the upper surface of the supporting table, a plurality of universal wheels are installed on two sides of the lower surface of the collecting box and placed in the semicircular grooves, a pushing handle is installed on one side of the upper end of the collecting box, a sand box is placed on one side of the supporting table on the ground, and the sand box is placed on one side of the outlet end of the hollow sleeve.

Furthermore, the moving range of the arc-shaped screening plate is located in the wrapping range of the arc-shaped notch.

Furthermore, the surface of one side of the arc-shaped screening plate is provided with a sliding chute, the surface of the other side of the arc-shaped screening plate is provided with a plurality of pulleys, and one end of each pulley is positioned in the sliding chute.

Furthermore, a pawl is arranged on the surface of one side of the first bevel gear, a ratchet wheel is arranged on the surface of one side of the second bevel gear, and the pawl is connected with the ratchet wheel.

The invention has the beneficial effects that: the sand screening machine is provided with a circular feeding cylinder which can feed sand conveniently, a plurality of arc screening plates are arranged on the outer side of the feeding cylinder, the arc screening plates can rotate around the outer side of the feeding cylinder to be convenient for switching different arc screening plates, the lowermost arc screening plate can shake through the rotation of a motor so as to screen sand, when impurities on the lowermost arc screening plate are accumulated to a certain degree, the arc screening plate can rotate away through the rotation of the motor so as to rotate the next arc screening plate, the impurities are not required to be cleaned manually, the labor intensity is reduced, the working efficiency is improved, the arc screening plate which is rotated away can be moved to the upper part of a hollow sleeve, under the action of gravity, the impurities enter the hollow sleeve through an arc notch and fall into a sand box, the sand can be cleaned and collected automatically, the working efficiency is improved, and when the arc screening plate with the impurities rotates, still can filter remaining sand, the more thorough of screening, when the arc screening board rotated the top, through the transmission between the gear, can make the clearance axle rotate to clear up the screening net mesh on the screening board, prevent that the mesh from blockking up, improved work efficiency.

Drawings

FIG. 1 is a schematic structural view of a sand rapid screening device according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

FIG. 4 is a schematic right-view of a sand rapid screening apparatus according to the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at C;

FIG. 6 is an enlarged view of a portion of FIG. 4 at D;

FIG. 7 is an enlarged view of a portion of FIG. 4 at E;

FIG. 8 is an enlarged view of a portion of FIG. 4 at F;

FIG. 9 is a schematic view of the position of the arcuate opening and the moving plate of the present invention;

FIG. 10 is an enlarged view of a portion of FIG. 9 at G;

FIG. 11 is a schematic partial top view of the sand discharge mechanism of the present invention;

in the figure, 1, a support table; 2. a hollow sleeve; 3. a support pillar; 4. a feeding cylinder; 5. connecting columns; 6. a discharge port; 7. inclining the feeding plate; 8. an arc-shaped feeding plate; 9. a support bar; 10. a square opening; 11. a feed channel; 12. a first universal ball; 13. a circular ring rotating plate; 14. a connecting rod; 15. an annular groove; 16. an arc-shaped opening; 17. a second ball gimbal; 18. an arc-shaped screening plate; 19. a protection plate; 20. a fan-shaped fixing plate; 21. a screening port; 22. screening a net; 23. moving the plate; 24. a tension spring; 25. a fixed table; 26. a servo motor; 27. a coupling; 28. a rotating shaft; 29. a first rolling bearing; 30. fixing the rod; 31. an eccentric wheel; 32. a slideway; 33. a support block; 34. a moving block; 35. a slider; 36. a first gear; 37. rotating the rod; 38. fixing a column; 39. a one-way bearing; 40. a second gear; 41. a second rolling bearing; 42. a first bevel gear; 43. a second bevel gear; 44. an arc-shaped notch; 45. inclining the material guide plate; 46. a semicircular plate; 47. a semicircular hole; 48. an arc-shaped surface; 49. a support wheel; 50. a flexible brush; 51. cleaning the plate; 52. a third rolling bearing; 53. cleaning the shaft; 54. flexibly cleaning a brush; 55. a third gear; 56. a tilting table; 57. a semicircular groove; 58. a collection box; 59. a universal wheel; 60. pushing the handle; 61. a sand box; 62. a chute; 63. a pulley; 64. a pawl; 65. and (4) ratchet wheels.

Detailed Description

The invention is described in detail below with reference to the accompanying drawings, as shown in FIGS. 1-11: a sand rapid screening device comprises a supporting table 1, a cleaning mechanism is arranged above the supporting table 1, a collecting mechanism is arranged below the cleaning mechanism, a sand filtering mechanism is arranged above the supporting table 1, a sand discharging mechanism is arranged on one side of the sand filtering mechanism,

the sand filtering mechanism comprises a hollow sleeve 2 positioned above a supporting table 1, supporting columns 3 are arranged on two sides of the lower end of the hollow sleeve 2, the lower ends of the supporting columns 3 are fixedly arranged on the upper surface of the supporting table 1, a feeding cylinder 4 is arranged in the hollow sleeve 2, the feeding cylinder 4 corresponds to the hollow sleeve 2 in a concentric mode, a plurality of connecting columns 5 are arranged on the outer side surface of the feeding cylinder 4, one ends of the connecting columns 5 are fixedly connected with the inner side surface of the feeding cylinder 4, a discharging port 6 is formed in the lower end of the feeding cylinder 4, an inclined feeding plate 7 is arranged in the feeding cylinder 4, an arc-shaped feeding plate 8 is arranged on one side of the inlet end of the feeding cylinder 4, a supporting rod 9 is arranged at the lower end of the arc-shaped feeding plate 8, the lower end of the supporting rod 9 is fixedly arranged on the upper surface of the supporting table 1, a square, the two sides of the hollow sleeve 2 are provided with circular ring rotating plates 13, the two circular ring rotating plates 13 are connected through a plurality of connecting rods 14, the inner sides of the circular ring rotating plates 13 are provided with annular grooves 15, the annular grooves 15 are sleeved on the outer sides of the first universal balls 12, the outer sides of the circular ring rotating plates 13 are provided with eight arc-shaped openings 16, a plurality of second universal balls 17 are arranged in the arc-shaped openings 16, eight arc-shaped screening plates 18 are arranged between the two circular ring rotating plates 13, the two sides of the arc-shaped screening plates 18 are provided with protection plates 19, the two protection plates 19 are connected through a fan-shaped fixing plate 20, screening openings 21 are arranged on the arc-shaped screening plates 18 and the protection plates 19, screening nets 22 are arranged at the screening openings 21, one side of the fan-shaped fixing plate 20 is provided with a moving plate 23, one end of the moving plate 23 extends to the outer sides of the circular ring rotating plates 13 through the arc-shaped openings,

the sandstone discharging mechanism comprises a fixed platform 25 fixedly arranged on one side of the upper surface of a supporting platform 1, a servo motor 26 is arranged on the upper surface of the fixed platform 25, a coupler 27 is arranged at the rotating end of the servo motor 26, the coupler 27 is connected with a rotating shaft 28, a first rolling bearing 29 is arranged at one end of the rotating shaft 28, a fixed rod 30 is arranged at the lower end of the first rolling bearing 29, the lower end of the fixed rod 30 is fixedly arranged on the upper surface of the fixed platform 25, an eccentric wheel 31 is arranged on the rotating shaft 28, slide ways 32 are arranged on two sides of the upper surface of the fixed platform 25, supporting blocks 33 are arranged on two sides of the lower end of each slide way 32, a movable block 34 is arranged between the two slide ways 32, slide blocks 35 are arranged at two ends of each movable block 34, one end of each slide block 35 extends into each slide way 32, each movable, a rotating rod 37 is arranged above the fixed platform 25, fixed columns 38 are arranged at two ends of the rotating rod 37, the lower ends of the fixed columns 38 are fixedly arranged on the upper surface of the fixed platform 25, a one-way bearing 39 is arranged at one side of the rotating rod 37, a second gear 40 is arranged at the outer side of the one-way bearing 39, the second gear 40 is meshed with the first gear 36, a second rolling bearing 41 is arranged at the other side of the rotating rod 37, a first bevel gear 42 is arranged at the outer side of the second rolling bearing 41, a second bevel gear 43 is arranged at one side of the rotating shaft 28, the second bevel gear 43 is meshed with the first bevel gear 42, an arc notch 44 is arranged at the upper end of the hollow sleeve 2, an inclined material guide plate 45 is arranged at the inner lower end of the hollow sleeve 2, the eccentric wheel 31 can be driven to rotate through forward rotation of the, the circular ring rotating plate 13 can be driven to rotate, so that the arc-shaped screening plate 18 is transferred away, and impurities can be conveniently cleaned.

Further, the ring rotating plate 13 is composed of two semicircular plates 46, a semicircular hole 47 is formed in the circle center position of each semicircular plate 46, and the two semicircular plates 46 are connected through a bolt, so that the ring rotating plate 13 can be conveniently installed on the hollow sleeve 2.

Further, the surface of the moving block 34 near the moving block 23 is an arc surface 48, and a plurality of supporting wheels 49 are mounted on the surface of the moving block 23 near the moving block 34, so as to reduce friction when the moving block 23 moves.

Further, the flexible brush 50 is installed on the surfaces of the shielding plate 19 and the sector fixing plate 20 near one side of the hollow sleeve 2 to prevent foreign substances from falling from the gap between the shielding plate 19 and the hollow sleeve 2.

Further, clearance mechanism includes the cleaning plate 51 of fixed mounting in 2 upper end both sides of hollow sleeve, third antifriction bearing 52 is installed to cleaning plate 51 inboard surface upper end, be equipped with clearance axle 53 between two cleaning plate 51, the clearance axle 53 both ends are inserted in third antifriction bearing 52, install flexible clearance brush 54 on the clearance axle 53, third gear 55 is installed to clearance axle 53 one side, third gear 55 and the meshing of first gear 36, can be when arc screening plate 18 rotates, clear up screening net 22 through flexible clearance brush 54.

Further, collect the mechanism and include fixed mounting at the sloping platform 56 of a supporting bench 1 side surface, it has a plurality of semicircular groove 57 to open supporting bench 1 upper surface, supporting bench 1 upper surface has placed collecting box 58, a plurality of universal wheels 59 are installed to collecting box 58 lower surface both sides, universal wheels 59 are placed in semicircular groove 57, collecting box 58 upper end one side is installed and is promoted handle 60, supporting bench 1 one side has subaerially placed grit case 61, grit case 61 is placed in hollow sleeve 2 exit end one side, can be convenient for collect sand and impurity respectively.

Further, the moving range of the arc-shaped screening plate 18 is within the wrapping range of the arc-shaped notch 44, so that impurities can be prevented from falling into the collection box 58.

Furthermore, one side surface of the arc-shaped screening plate 18 is provided with a sliding groove 62, the other side surface of the arc-shaped screening plate 18 is provided with a plurality of pulleys 63, and one end of each pulley 63 is positioned in the sliding groove 62, so that the friction force between the arc-shaped screening plates 18 can be reduced.

Further, a pawl 64 is installed on one side surface of the first bevel gear 42, a ratchet 65 is installed on one side surface of the second bevel gear 40, and the pawl 64 and the ratchet 65 are connected to allow the circular rotating plate 13 to rotate in one direction.

In the embodiment, the electric equipment of the device is controlled by an external controller, the collecting box 58 is moved to the supporting platform 1 through the inclined platform 56 and the universal wheel 59, the universal wheel 59 falls into the semicircular groove 57 to prevent the collecting box 58 from shaking, the brake pad of the universal wheel 59 is locked, the sand box 61 is placed below one side of the outlet end of the hollow sleeve 2, the two semicircular plates 46 are sleeved outside the hollow sleeve 2 and connected through the bolts, the annular groove 15 is sleeved outside the first universal ball 12 to facilitate the rotation of the circular rotating plate 13,

the servo motor 25 is started to rotate forwards, the rotating shaft 28 is driven to rotate through the coupler 27, the rotating shaft 28 drives the second bevel gear 43 to rotate, the second bevel gear 43 is meshed with the first bevel gear 42 and can drive the first bevel gear 42 to rotate, the first bevel gear 42 is connected with the second gear 40 through the pawl 64 and the ratchet 65 and can drive the second gear 40 to rotate outside the one-way bearing 39, the second gear 40 is meshed with the first gear 36 and can drive the circular rotating plate 13 to rotate, so that one of the arc screening plates 18 is rotated to the lowest part through the arc opening 16 and the moving plate 23, the servo motor 25 is closed at the moment, the eccentric wheel 31 can be driven to rotate when the servo motor 25 rotates forwards, the moving block 34 can be moved towards the moving plate 23, the moving direction of the moving block 34 can be ensured through the slide block 35 and the slide way 32, and the friction between the moving block 34 and the moving block 23 when the moving plate 23 rotates can be reduced through the arc, thereby facilitating the switching of the arcuate screening plates 13,

after the arc-shaped screening plate 13 is rotated to a certain position, the servo motor 25 is started to rotate reversely, the rotating shaft 28 is driven to rotate through the coupling 27, the rotating shaft 28 drives the second bevel gear 43 to rotate, the second bevel gear 43 is meshed with the first bevel gear 42 to drive the first bevel gear 42 to rotate, the first bevel gear 42 is connected with the second gear 40 through the pawl 64 and the ratchet 65, the pawl 64 can deflect by itself through the action of the one-way bearing 39 to prevent the second gear 40 from rotating, so that the circular rotating plate 13 and the arc-shaped screening plate 18 can be prevented from rotating, the eccentric wheel 31 can be driven to rotate when the servo motor 25 rotates reversely, the moving block 34 can be moved towards the moving plate 23, the moving direction of the moving block 34 can be ensured through the sliding block 35 and the sliding way 32, when the end of the eccentric wheel 31, which is far away from the center of the cross section of the rotating shaft 28, at this time, the moving plate 23 is pushed in a direction away from the eccentric wheel 31, the second universal ball 17 can reduce the friction force when the moving plate 23 moves, so that the arc-shaped screening plate 18, the protection plate 19 and the fan-shaped fixing plate 20 at the lowest position move, the telescopic spring 24 is compressed, when one end of the eccentric wheel 31 close to the center of the cross section of the rotating shaft 28 rotates to one side of the moving block 34, under the action of the telescopic spring 24, the arc-shaped screening plate 18, the protection plate 19, the fan-shaped fixing plate 20 and the moving plate 23 can be pushed back to the original position, so that the arc-shaped screening plate 18 shakes once, the eccentric wheel 31 is continuously driven to rotate by the servo motor 25, the arc-shaped screening plate 18 can constantly shake, the arc-shaped screening plate 18 at the lowest position and the adjacent arc-shaped screening plate 18 are connected through the pulley 63 and the chute 62, the friction force between the arc-, the sand is convenient to be screened,

the screen is placed on the arc-shaped feeding plate 8 by the worker, sand falls above the arc-shaped screening plate 18 at the lowest part through the inclined feeding plate 7, the discharging port 6, the feeding channel 11 and the square opening 10 under the action of gravity, the protection plates 19 and the fan-shaped fixing plates 20 at two sides of the arc-shaped screening plate 18 can prevent the sand from falling, so that the sand is screened through the screening net 22 by the shaking of the arc-shaped screening plate 19, the sand falls into the collecting box 58 through the screening net 22, impurities are left above the screening net 22,

when impurities on the screening net 22 are accumulated to a certain amount, a worker starts the servo motor 25 to rotate forward, so that the circular rotating plate 13 rotates by a certain angle, the arc screening plate 18 at the lowest part is rotated away, the adjacent arc screening plates 18 are rotated to the lowest part, sand is continuously screened, the arc screening plate 18 containing the impurities rotates to one side of the hollow sleeve 2 at the moment, the arc screening plate 18 containing the impurities slightly shakes through smaller friction force between the arc screening plate 18 at the lowest part and the arc screening plate 18, the sand remaining in the arc screening plate 18 is screened through the screening net 22 on the protection plate 19, after the arc screening plate 18 containing the impurities moves for three times, the protection plate 19 at one side of the arc screening plate 18 moves to one side of the arc notch 44, the impurities fall into a gap between the hollow sleeve 2 and the feeding cylinder 4 under the action of gravity, the flexible brush 50 can prevent the impurities from falling from the gap between the protection plate 19 and the hollow sleeve 2, after falling into the hollow sleeve 2, the impurities fall onto the inclined material guide plate 45 and slide into the sand box 61 under the action of gravity to be collected,

when the circular rotating plate 13 rotates, the first gear 36 is meshed with the third gear 55 to drive the cleaning shaft 53 to rotate and drive the flexible cleaning brush 54 to rotate, so that the flexible cleaning brush 54 and the screening net 22 on the uppermost arc-shaped screening plate 18 generate relative motion and are cleaned to prevent blockage, when a certain amount of sand in the collecting box 58 is collected, the servo motor 25 is turned off, the brake pad on the universal wheel 59 is loosened, the collecting box 58 is pushed out by pushing the handle 60, and the new collecting box 58 is replaced to continue collection.

The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.

Claims

1. A sand rapid screening device comprises a supporting table (1), a cleaning mechanism is arranged above the supporting table (1), a collecting mechanism is arranged below the cleaning mechanism, the sand rapid screening device is characterized in that a sand filtering mechanism is arranged above the supporting table (1), a sand discharging mechanism is arranged on one side of the sand filtering mechanism,

the sand filtering mechanism comprises a hollow sleeve (2) positioned above a supporting table (1), supporting columns (3) are arranged on two sides of the lower end of the hollow sleeve (2), the lower ends of the supporting columns (3) are fixedly arranged on the upper surface of the supporting table (1), a feeding cylinder (4) is arranged in the hollow sleeve (2), the feeding cylinder (4) and the hollow sleeve (2) concentrically correspond to each other, a plurality of connecting columns (5) are arranged on the outer side surface of the feeding cylinder (4), one ends of the connecting columns (5) are fixedly connected with the inner side surface of the feeding cylinder (4), a discharge hole (6) is formed in the lower end of the feeding cylinder (4), an inclined feeding plate (7) is arranged in the feeding cylinder (4), an arc-shaped feeding plate (8) is arranged on one side of an inlet end of the feeding cylinder (4), a supporting rod (9) is arranged at the lower, the lower end of the feeding cylinder (4) is provided with a square opening (10), the discharge port (6) is connected with the square opening (10) through a feeding channel (11), a plurality of first universal balls (12) are arranged at two ends of the hollow sleeve (2), ring rotating plates (13) are arranged at two sides of the hollow sleeve (2), the two ring rotating plates (13) are connected through a plurality of connecting rods (14), an annular groove (15) is formed in the inner side of each ring rotating plate (13), the annular groove (15) is sleeved on the outer side of each first universal ball (12), eight arc openings (16) are formed in the outer side of each ring rotating plate (13), a plurality of second universal balls (17) are arranged in each arc opening (16), eight arc screening plates (18) are arranged between the two ring rotating plates (13), protection plates (19) are arranged at two sides of each arc screening plate (18), and the two protection plates (19) are connected through a fan-shaped fixing plate (20), the arc-shaped screening plate (18) and the protection plate (19) are provided with screening openings (21), screening nets (22) are arranged at the screening openings (21), a movable plate (23) is arranged at one side of the fan-shaped fixed plate (20), one end of the movable plate (23) extends to the outer side of the circular ring rotating plate (13) through the arc-shaped opening (16), the fan-shaped fixed plate (20) far away from the inlet end of the feeding cylinder (4) is fixedly connected with the circular ring rotating plate (13) through a plurality of telescopic springs (24),

the gravel discharging mechanism comprises a fixed table (25) fixedly installed on one side of the upper surface of a supporting table (1), a servo motor (26) is installed on the upper surface of the fixed table (25), a coupler (27) is installed at the rotating end of the servo motor (26), the coupler (27) is connected with a rotating shaft (28), a first rolling bearing (29) is installed at one end of the rotating shaft (28), a fixing rod (30) is installed at the lower end of the first rolling bearing (29), the lower end of the fixing rod (30) is fixedly installed on the upper surface of the fixed table (25), an eccentric wheel (31) is installed on the rotating shaft (28), slide ways (32) are installed on two sides of the upper surface of the fixed table (25), supporting blocks (33) are installed on two sides of the lower end of each slide way (32), the lower ends of the supporting blocks (33) are fixedly installed on the fixed table, one end of a sliding block (35) extends into the slide way (32), a moving block (34) is positioned between the eccentric wheel (31) and the lowest moving plate (23), a first gear (36) is installed on the outer side of a circular ring rotating plate (13) close to one side of the fixed platform (25), a rotating rod (37) is arranged above the fixed platform (25), fixed columns (38) are installed at two ends of the rotating rod (37), the lower ends of the fixed columns (38) are fixedly installed on the upper surface of the fixed platform (25), a one-way bearing (39) is installed on one side of the rotating rod (37), a second gear (40) is installed on the outer side of the one-way bearing (39), the second gear (40) is meshed with the first gear (36), a second rolling bearing (41) is installed on the other side of the rotating rod (37), a first bevel gear (42) is installed on the outer side of the second rolling bearing (41), a second bevel gear (43) is, the upper end of the hollow sleeve (2) is provided with an arc-shaped gap (44), and the lower end in the hollow sleeve (2) is provided with an inclined material guide plate (45).

2. The sand rapid screening device according to claim 1, wherein the circular rotating plate (13) is composed of two semicircular plates (46), a semicircular hole (47) is formed in the center of the semicircular plates (46), and the two semicircular plates (46) are connected through a bolt.

3. The sand rapid screening device according to claim 1, wherein one side surface of the moving block (34) close to the moving block (23) is an arc-shaped surface (48), and a plurality of supporting wheels (49) are arranged on one side surface of the moving block (23) close to the moving block (34).

4. A sand screening device according to claim 1, wherein the protective plate (19) and the fan-shaped fixing plate (20) are provided with a flexible brush (50) on the surface of one side close to the hollow sleeve (2).

5. The sand rapid screening device according to claim 1, wherein the cleaning mechanism comprises cleaning plates (51) fixedly arranged at two sides of the upper end of the hollow sleeve (2), a third rolling bearing (52) is arranged at the upper end of the inner side surface of each cleaning plate (51), a cleaning shaft (53) is arranged between the two cleaning plates (51), two ends of each cleaning shaft (53) are inserted into the corresponding third rolling bearing (52), a flexible cleaning brush (54) is arranged on each cleaning shaft (53), a third gear (55) is arranged at one side of each cleaning shaft (53), and the third gear (55) is meshed with the first gear (36).

6. The sand rapid screening device according to claim 1, wherein the collecting mechanism comprises an inclined table (56) fixedly mounted on one side surface of the support table (1), a plurality of semicircular grooves (57) are formed in the upper surface of the support table (1), a collecting box (58) is placed on the upper surface of the support table (1), a plurality of universal wheels (59) are mounted on two sides of the lower surface of the collecting box (58), the universal wheels (59) are placed in the semicircular grooves (57), a pushing handle (60) is mounted on one side of the upper end of the collecting box (58), a sand box (61) is placed on the ground on one side of the support table (1), and the sand box (61) is placed on one side of the outlet end of the hollow sleeve (2).

7. A sand screening apparatus according to claim 1 wherein the arcuate screen plate (18) has a range of movement within the envelope of the arcuate slot (44).

8. The sand rapid screening device according to claim 1, wherein a chute (62) is formed on one side surface of the arc-shaped screening plate (18), a plurality of pulleys (63) are mounted on the other side surface of the arc-shaped screening plate (18), and one end of each pulley (63) is positioned in the chute (62).

9. A sand screening device according to claim 1, wherein a pawl (64) is installed on one side surface of the first bevel gear (42), a ratchet wheel (65) is installed on one side surface of the second gear (40), and the pawl (64) is connected with the ratchet wheel (65).