CN212189954U

CN212189954U - Sand filter and sand-stone separating device using same

Info

Publication number: CN212189954U
Application number: CN202020322142.0U
Authority: CN
Inventors: 欧阳涤新; 张运泉; 袁杰; 刘康泰
Original assignee: Shenzhen Jinrui Building Materials Co ltd
Current assignee: Shenzhen Jinrui Building Materials Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-12-22
Anticipated expiration: 2030-03-13

Abstract

The utility model relates to a sand filter and a sand-stone separating device using the sand filter, which comprises a roller, a shell and a bracket, wherein the roller is provided with sieve pores, the roller is obliquely arranged in the shell, a stirring shaft is arranged in the roller, spiral guide slurry is arranged on the stirring shaft, and the stirring shaft is fixedly connected with the roller; the shell is connected with a cleaning assembly for cleaning sieve pores, and the cleaning assembly is positioned above the roller; the cleaning assembly comprises a fixed plate fixed on the shell, the fixed plate is provided with placing holes which are in one-to-one correspondence with the sieve pores along the axial direction of the roller, and inserting columns which are in screw shapes and different in length and movably extend into the placing holes in the vertical direction, and the fixed plate is horizontally positioned right above the roller; when no sieve pore is arranged at the uppermost part of the roller, the lowest part of the inserted column is abutted against the outer wall of the roller; when the sieve holes in the axial direction of the roller are positioned right above, the bottoms of the inserting columns stretch into the sieve holes and do not stretch into the roller. Insert the post when the cylinder rotates and can clear up blockking up sieve mesh or sieve mesh department large granule, improved the filterable efficiency of cylinder.

Description

Sand filter and sand-stone separating device using same

Technical Field

The utility model belongs to the technical field of the concrete waste material separation technique and specifically relates to a sand and stone separator of sand filter and application this sand filter is related to.

Background

The sand-stone separator is also called a concrete sand-stone separator or concrete sand-stone separation slurry recovery equipment, and is used for separating concrete sand and stone to ensure that sand and stone can be reused.

The main process of the mud sand-stone separator for concrete is as follows: cleaning the residual concrete in the rotary drum of the concrete mixer truck, pouring the cleaned residual concrete into a discharge chute, allowing the cleaned residual concrete to flow into a mud-rock separator under the impact of water flow, allowing the concrete to enter from a feed inlet of the separator, and allowing stones or large-particle substances to move out from a stone outlet under the action of spiral guide slurry in a screen drum of the separator; during the rotation of the drum, sand and slurry with smaller particles are screened out of the screen holes of the screen and collected, so that stones and sand in concrete are separated from the slurry, and the sand and slurry are further filtered, separated and collected through the sand filtering net.

However, in the course of the separation, the screen cloth in the cylinder can be blocked up the dead condition by tiny stone or large granule thing, the continuous rotation of cylinder, and sewage concentration in the cylinder is bigger and bigger, can be plugged up by more stone or large granule gradually on the screen cloth in the cylinder, needs the shut down work, and the manual work is cleared up, influences work efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sand filter and utilize sand and stone separator of this sand filter, through setting up the post of inserting that can clear up the sieve mesh in the cylinder top, can clear up blockking up sieve mesh or sieve mesh department large granule when the cylinder rotates, improved the filterable efficiency of cylinder.

The utility model discloses an aim at can realize through following technical scheme: a sand filter comprises a rotary drum, a shell and a bracket, wherein sieve pores are uniformly distributed on the rotary drum, the rotary drum is obliquely arranged in the shell, a stirring shaft is arranged in the rotary drum, spiral guide slurry is arranged on the stirring shaft, the stirring shaft is fixedly connected with the rotary drum, a driving motor is arranged at the higher end of the rotary drum, the stirring shaft is fixedly connected to the driving motor, a stone outlet for discharging stones is formed in the higher end of the rotary drum, and a feeding plate is connected to the lower end of the rotary drum; the shell is connected with a cleaning assembly for cleaning sieve pores, and the cleaning assembly is positioned above the roller;

the cleaning assembly comprises a fixed plate fixed on the shell, the fixed plate is provided with placing holes which are in one-to-one correspondence with the sieve pores along the axial direction of the roller, and inserting columns which are in screw shapes and different in length and movably extend into the placing holes in the vertical direction, and the fixed plate is horizontally positioned right above the roller; when no sieve pore is arranged at the uppermost part of the roller, the lowest part of the inserted column is abutted against the outer wall of the roller; when the sieve holes in the axial direction of the roller are positioned right above, the bottoms of the inserting columns stretch into the sieve holes and do not stretch into the roller.

By adopting the technical scheme, the cleaning assembly for cleaning the sieve pores is arranged above the roller, concrete slurry is guided into the roller from the feeding plate, the driving motor is started, the stirring shaft and the roller are driven to rotate by the driving motor, in the rotation of the roller, stones move to the stone outlet from the lowest position of the roller under the action of spiral guide slurry and are discharged out of the shell, and sand and slurry move downwards through the screen of the roller in a filtering manner; the clearance subassembly will block up the granule clearance in the sieve mesh to avoid the granule to block up the sieve mesh and influence filter effect and efficiency. In the rotation process of the roller, the sand and stone accumulation phenomenon is not easy to occur at the highest point of the roller, the inserting columns clean the sieve holes rotating to the highest point of the roller, each inserting column cleans the sieve holes in the circumferential direction of the roller, the inserting columns are kept in a vertical state by means of gravity of the inserting columns, when the sieve holes are about to rotate below the inserting columns, the bottoms of the inserting columns stretch into the sieve holes and exert downward acting force on particles in the sieve holes to push the particles out of the sieve holes, the blockage of the sieve holes is avoided, the roller continues to rotate, the inner walls of the sieve holes have acting force along the rotation direction of the roller on the bottoms of the inserting columns, the inserting columns move upwards under the acting force to be separated from the sieve holes, the roller continues to rotate, the inserting columns are about to clean the next sieve holes in the circumferential direction of the roller, the inserting columns repeatedly clean the sieve holes on the filter screen, large particles blocking the sieve holes or large particles about to form the, the filtering effect is improved.

Preferably, the bottom of the inserted column is a cone or an inclined plane which is smaller than the aperture of the sieve pore and has a sharper lower part.

By adopting the technical scheme, the bottom of the inserted column adopts a sharp taper or an inclined plane, so that the contact area with particles in the sieve pores is reduced, the acting force on the particles is enhanced, and the tapered bottom is beneficial to the removal of the inserted column from the sieve pores; when the inserted column is to be separated from the sieve hole, the end face with the bottom part being the inclined plane of the inserted column is firstly contacted with the inner wall of the sieve hole so as to be better moved out of the sieve hole.

Preferably, the end face of the fixing plate facing the roller is provided with a water injection pipe, the water injection pipe surrounds the edge of the fixing plate, and one side of the water injection pipe facing the roller is evenly provided with water spray holes.

Through adopting above-mentioned technical scheme, utilize water injection pipe and water spray hole to spray water to the cylinder, the water spray is when the sieve mesh, and through the effort of water, part particulate matter breaks away from in the sieve mesh, reduces to block up the particulate matter and blocks up in sieve mesh department, and the while rivers also can further dilute the concrete mud in the cylinder in flowing to the cylinder for the filtration of sand and mud.

Preferably, the cylinder below is equipped with the sand screen unanimous with cylinder incline direction, and the casing is equipped with the sand outlet at the lower end of sand screen, and sand outlet department is equipped with and is used for blockking that the thick liquids spills over, and the casing is equipped with the thick liquids groove under the sand screen, and the thick liquids groove bottom is equipped with the water conservancy diversion mouth, and water conservancy diversion mouth bottom is equipped with the accumulator that is used for collecting the thick liquids.

Through adopting above-mentioned technical scheme, the sand screen that the slope set up so that to the grit on the sand screen collect sand outlet department, realize the collection so that reuse to the thick liquids through thick liquids groove and accumulator.

Preferably, one side that the cylinder was kept away from to the sand screen is equipped with the drive sand screen and reciprocates actuating mechanism, actuating mechanism includes the driving lever, two round pins of connecting on the driving lever, the sheave with round pin sliding connection, the sheave is kept away from the arch on the driving lever one side, be used for protruding upper and lower slip and vertically be provided with the deflector of erecting the groove and drive driving lever pivoted first motor, first motor is located outside the casing, the one side that the sheave is close to the driving lever is equipped with four spouts that rotate the looks adaptation with the round pin, deflector bottom fixed connection is at the thick liquid silo inner wall, the terminal surface of sheave highest point is equipped with "L" type backup pad, backup pad and sand screen fixed connection.

By adopting the technical scheme, the first motor is started, the first motor drives the shifting lever to rotate, the round pin on the shifting lever is connected in the sliding groove in a sliding mode, the grooved wheel is pushed to move up and down on the guide plate, the grooved wheel drives the sand filtering net and sand and slurry on the sand filtering net to move up and down, the sand and the slurry move up and down, the filtering on the sand filtering net is accelerated, and the efficiency is improved.

Preferably, the blocking piece comprises a movable plate and slots, the movable plate is vertically arranged at the lowest position of the sand filtering net and positioned outside the shell, the slots are fixed on the shell and arranged on two sides of the movable plate, the movable plate is fixedly connected with the sand filtering net, the movable plate can shield the sand outlet, one surface of the movable plate facing the sand filtering net is attached to the outer wall of the shell, and two ends of the movable plate are movably inserted into the slots up and down; a movable plate is arranged on the movable plate and located above the sand filtering net, one end of the movable plate is hinged to the movable plate, and the other end of the movable plate is movably connected to the movable plate through a bolt.

Through adopting above-mentioned technical scheme, the movable plate sets up with sand screen fixed connection, avoids the mud on the sand screen to spill over from the sand outlet, inconvenient collection, and the setting of slot more does benefit to the operation of movable plate and has the support to the movable plate and prescribe a limit to the effect. When the sand needs to be discharged from the sand outlet, the movable plate is opened to enable the sand gathered at the sand outlet to flow out from the sand outlet, and the sand outlet is convenient to operate and easier to control.

Preferably, four groups of driving mechanisms are arranged below the sand filtering net.

Through adopting above-mentioned technical scheme, four actuating mechanism of group disperse in the sand screen lower extreme, make the sand screen can support more sand and mud, and make the reciprocating of sand screen more steady.

Preferably, the movable plate is fixedly connected with a material guide plate positioned at the lower end of the movable plate, and one end of the material guide plate, which is far away from the movable plate, is inclined downwards.

Through adopting above-mentioned technical scheme, the stock guide that the slope set up does benefit to sand and the large granule material of sand outlet department and rolls from the stock guide and fall, is convenient for collect.

The second purpose of the utility model is realized by the following technical scheme: the utility model provides a sand and stone separator, includes sand filter and blowpit, the discharge gate of blowpit is linked together with sand filter's feed plate.

Through adopting above-mentioned technical scheme, the blowpit provides concrete slurry for the sand filter, is provided with actuating mechanism on the sand filter and can realizes the separation of stone, sand and mud in same device, and actuating mechanism can accelerate grit separator's filter effect and efficiency.

Preferably, the bottom of the discharge chute is provided with a slope inclined towards the feeding plate.

Through adopting above-mentioned technical scheme, the slope that the blowpit tank bottom set up is convenient for concrete mud to shift and flow towards the feed plate, reduces the piling up of concrete mud at the tank bottom.

To sum up, the utility model discloses a beneficial technological effect does:

1. set up the post of inserting that is used for clearing up the sieve mesh above the cylinder, insert post bottom and cylinder outer wall highest point butt, rotate the in-process at the cylinder, clear up cylinder ascending sieve mesh in week, combine the water injection pipe water spray on the fixed plate, further clear up the granule of jam on the sieve mesh or the large granule that is about to pile up in the sieve mesh, improved the filter effect and the speed of screen cloth on the cylinder.

2. Four groups of driving mechanisms are arranged below the sand filtering net, so that the sand filtering net can move up and down, the filtering speed of sand and slurry is increased, and the filtering effect is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of a sand separator.

Fig. 2 is a sectional view of the sand screen of the present invention.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Fig. 4 is an exploded view of the sand filter of the present invention.

In the figure, 1, a roller; 11. screening holes; 12. a stirring shaft; 13. a feeding plate; 14. a drive motor; 15. a stone outlet; 2. a housing; 3. a support; 4. cleaning the assembly; 41. a fixing plate; 42. placing holes; 43. inserting a column; 44. a water injection pipe; 51. a sand screen; 52. a sand outlet; 531. moving the plate; 532. a material guide plate; 533. a movable plate; 54. a slurry tank; 55. a flow guide port; 56. a recovery tank; 6. a drive mechanism; 61. a deflector rod; 62. a round pin; 63. a grooved wheel; 64. a chute; 65. a guide plate; 66. a first motor; 67. a support plate; 7. a discharge chute; 71. a ramp.

Detailed Description

The present invention will be described in further detail with reference to the accompanying fig. 1-4.

Example one

Referring to fig. 1 and 2, a sand filter, including cylinder 1, 1 outer casing 2 of cylinder and support 3, be equipped with sieve mesh 11 on the cylinder 1, cylinder 1 slope sets up in casing 2, the higher one end of cylinder 1 is connected with driving motor 14, the higher one end of cylinder 1 is equipped with stone outlet 15, stone outlet 15 is located driving motor 14's below, the lower one end of cylinder 1 is connected with feed plate 13, be equipped with in the cylinder 1 with the axial (mixing) shaft 12 with cylinder 1, be equipped with spiral direction thick liquid on the (mixing) shaft 12, (mixing) shaft 12 and cylinder 1 fixed connection. Concrete slurry is guided into the roller 1 from the feeding plate 13, the driving motor 14 is started, the driving motor 14 drives the stirring shaft 12 and the roller 1 to rotate, in the rotation of the roller 1, stones move to the stone outlet 15 at a high position from the lowest position of the roller 1 under the action of spiral guide slurry and are removed from the shell 2, and sand and slurry are filtered through the sieve holes 11 of the roller 1 and flow out of the roller 1.

Referring to fig. 1 and 2, a cleaning assembly 4 for cleaning the screen holes 11 is connected to the housing 2, and the cleaning assembly 4 is located above the drum 1. The cleaning assembly 4 comprises a fixing plate 41 fixed on the shell 2, the fixing plate 41 is provided with placing holes 42 which are vertically corresponding to the sieve holes 11 at the highest positions in the axial direction of the roller 1 along the axial direction of the roller 1, and inserting columns 43 which movably extend into the placing holes 42 in a vertical direction and have different screw-shaped lengths, and the fixing plate 41 is horizontally positioned right above the roller 1; when the roller 1 is not provided with the sieve holes 11 at the top, the lowest part of the inserting column 43 is abutted against the outer wall of the roller 1; when being located directly over along ascending sieve mesh 11 of cylinder 1 axial, insert the bottom of post 43 and stretch into sieve mesh 11 and do not stretch into cylinder 1 in, insert post 43 bottom for being less than sieve mesh 11 aperture and the lower part comparatively sharp-pointed toper or inclined plane, the toper is adopted to this embodiment. In the rotation process of the roller 1, the sand and stone accumulation phenomenon is not easy to occur at the highest point of the roller 1, the inserting columns 43 clean the sieve holes 11 rotating to the highest point of the roller 1, each inserting column 43 cleans the sieve holes 11 on the circumference of the roller 1, the inserting columns 43 are kept in a vertical state by means of the gravity of the inserting column 43, when the sieve holes 11 are about to rotate to the lower side of the inserting column 43, the bottoms of the inserting columns 43 extend into the sieve holes 11, downward acting force is applied to particles in the sieve holes 11 to push the particles out of the sieve holes 11 to avoid blocking the sieve holes 11, the roller 1 continues to rotate, the acting force along the rotation direction of the roller 1 is arranged at the bottoms of the inserting columns 43 on the inner walls of the sieve holes 11, under the acting force, the inserting columns 43 move upwards to be separated from the sieve holes 11, the roller 1 continues to rotate, the inserting columns 43 are about to clean the next sieve holes 11 on the circumference of the roller 1, and the inserting, can conveniently clear up the large granule that blocks up sieve mesh 11 or be about to form the large granule that blocks up sieve mesh 11, improve the filter effect.

Referring to fig. 1 and 2, a water injection pipe 44 is disposed on an end surface of the fixing plate 41 facing the drum 1, the water injection pipe 44 surrounds an edge of the fixing plate 41, water spray holes are uniformly formed in one side of the water injection pipe 44 facing the drum 1, and one end of the water injection pipe 44 is connected to a water pump. Utilize water injection pipe 44 and water spray hole to spray water to cylinder 1 in this embodiment, spout the effort through water, break away from in 11 interior part particulate matters of sieve mesh 11 follow sieve mesh 11, reduce to block up the particulate matter and block up in 11 departments of sieve mesh, rivers also can further dilute the concrete mud in the cylinder 1 in to cylinder 1 simultaneously for the filtration of sand and mud.

Referring to fig. 4, a sand screen 51 consistent with the inclination direction of the drum 1 is arranged below the drum 1, a sand outlet 52 is arranged at the lower end of the sand screen 51 of the housing 2, a blocking part for blocking slurry is arranged at the sand outlet 52, the blocking part comprises a movable plate 531 arranged at the lowest position of the sand screen 51 and vertically arranged and slots (not shown in the figure) fixed on the housing 2 and arranged on two sides of the movable plate 531, the movable plate 531 is fixedly connected with the sand screen 51, the movable plate 531 is positioned outside the housing 2, the movable plate 531 can block the sand outlet 52, one surface of the movable plate 531 facing the sand screen 51 is attached to the outer wall of the housing 2, two ends of the movable plate 531 are movably inserted into the slots up and down, the slots are arranged to facilitate the operation of the movable plate 531 and have a. A movable plate 533 is arranged on the movable plate 531, the movable plate 533 is located on the sand screen 51, one end of the movable plate 533 is hinged to the movable plate 531, the other end of the movable plate 533 is movably connected to the movable plate 531 through a pin, a material guide plate 532 located at the lower end of the movable plate 533 is fixedly connected to the movable plate 531, and one end, away from the movable plate 533, of the material guide plate 532 is arranged in a downward inclined mode. When the sand needs to be discharged from the sand outlet 52, the movable plate 533 is opened to enable the sand accumulated at the sand outlet 52 to flow out from the sand outlet 52 and roll off from the obliquely arranged material guide plate 532, so that the operation is convenient and easy to control.

Referring to fig. 2 and 3, a driving mechanism 6 for driving the sand screen 51 to move up and down is arranged on one side of the sand screen 51 far away from the roller 1, four sets of driving mechanisms 6 are arranged below the sand screen 51, and the four sets of driving mechanisms 6 are dispersed at the lower end of the sand screen 51. Actuating mechanism 6 includes driving lever 61, two round pins 62 of connecting on driving lever 61, sheave 63 with round pin 62 sliding connection, the arch on driving lever 61 one side is kept away from to sheave 63, supply to slide and vertically be provided with the deflector 65 of vertical groove and drive driving lever 61 pivoted first motor 66 about the arch, first motor 66 is fixed to be set up outside being located casing 2, deflector 65 is fixed on casing 2's inner wall, the one side that sheave 63 is close to driving lever 61 is equipped with four spouts 64 with the equal adaptation of round pin 62 size, the terminal surface of sheave 63 highest department is equipped with the backup pad 67 of "L" type, backup pad 67 and sand screen 51 fixed connection. The first motor 66 is started, the first motor 66 drives the shifting lever 61 to rotate, the round pin 62 on the shifting lever 61 is connected in the sliding groove 64 in a sliding mode, the grooved wheel 63 is pushed to move, the protrusion on the grooved wheel 63 moves up and down in the vertical groove on the guide plate 65, the grooved wheel 63 drives the sand and mud on the sand filter screen 51 and the sand filter screen 51 to move up and down, the sand and mud move up and down, the filtering on the sand filter screen 51 is accelerated, and the efficiency is improved.

Referring to fig. 1 and 2, a slurry tank 54 is arranged at the lower end of the sand filter 51, a diversion port 55 is arranged at the bottom of the slurry tank 54, and a recovery tank 56 for collecting slurry is arranged at the bottom of the diversion port 55.

The implementation principle of the embodiment is as follows: starting a driving motor 14, wherein the driving motor 14 drives a stirring shaft 12 and a roller 1 to rotate, in the rotation of the roller 1, the inserting columns 43 clean the sieve holes 11 at the highest positions of the roller 1, each inserting column 43 cleans the sieve holes 11 on the periphery of the roller 1, the inserting columns 43 are kept in a vertical state by means of the gravity of the inserting columns, when the sieve holes 11 are about to rotate to the lower side of the inserting columns 43, the bottoms of the inserting columns 43 extend into the sieve holes 11, downward acting force is applied to particles in the sieve holes 11, the particles are pushed out of the sieve holes 11, and the sieve holes 11 are cleaned; the sand filtering net 51 is arranged below the roller 1, and the shifting rod 61 and the grooved wheel 63 are arranged below the sand filtering net 51, so that the sand filtering net 51 can move up and down, the filtering on the sand filtering net 51 is accelerated, and the filtering efficiency is improved.

Example two

Referring to fig. 1, a sand and stone separating device comprises a sand filter and a discharge chute 7, wherein a discharge hole of the discharge chute 7 is communicated with a feed plate 13 of the sand filter to provide concrete slurry for the sand filter, and a slope 71 inclined towards the feed plate 13 is arranged at the bottom of the discharge chute 7 to reduce the accumulation of the concrete slurry at the bottom of the chute.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a sand filter, includes cylinder (1), casing (2) and support (3), evenly distributed has sieve mesh (11), its characterized in that on cylinder (1): the rotary drum (1) is obliquely arranged in the shell (2), a stirring shaft (12) is arranged in the rotary drum (1), spiral guide slurry is arranged on the stirring shaft (12), the stirring shaft (12) is fixedly connected with the rotary drum (1), a driving motor (14) is arranged at the higher end of the rotary drum (1), the stirring shaft (12) is fixedly connected onto the driving motor (14), a stone outlet (15) for discharging stones is formed at the higher end of the rotary drum (1), and a feeding plate (13) is connected at the lower end of the rotary drum (1); the shell (2) is connected with a cleaning assembly (4) for cleaning the sieve pores (11), and the cleaning assembly (4) is positioned above the roller (1);

the cleaning assembly (4) comprises a fixing plate (41) fixed on the shell (2), the fixing plate (41) is provided with placing holes (42) which are vertically corresponding to the sieve holes (11) in the axial direction of the roller (1) one by one, and inserting columns (43) which movably extend into the placing holes (42) in the vertical direction and have different screw-shaped lengths, and the fixing plate (41) is horizontally positioned right above the roller (1); when the uppermost part of the roller (1) is not provided with the sieve holes (11), the lowest part of the inserted column (43) is abutted against the outer wall of the roller (1); when the sieve holes (11) along the axial direction of the roller (1) are positioned right above, the bottoms of the inserting columns (43) extend into the sieve holes (11) and do not extend into the roller (1).

2. A sand screen as defined in claim 1, wherein: the bottom of the inserting column (43) is a cone or an inclined plane which is smaller than the aperture of the sieve pore (11) and has a sharper lower part.

3. A sand screen as defined in claim 2, wherein: the water injection device is characterized in that a water injection pipe (44) is arranged on the end face, facing the roller (1), of the fixing plate (41), the water injection pipe (44) surrounds the edge of the fixing plate (41), and water spray holes are uniformly formed in one side, facing the roller (1), of the water injection pipe (44).

4. A sand screen as defined in claim 1, wherein: the drum-type sand filtering machine is characterized in that a sand filtering net (51) which is consistent with the drum (1) in the inclined direction is arranged below the drum (1), a sand outlet (52) is formed in the lower end of the sand filtering net (51) of the shell (2), a blocking piece used for blocking slurry from overflowing is arranged at the sand outlet (52), a slurry groove (54) is formed in the shell (2) below the sand filtering net (51), a flow guide opening (55) is formed in the bottom of the slurry groove (54), and a recovery tank (56) used for collecting slurry is arranged at the bottom of the flow guide opening (55).

5. A sand screen as claimed in claim 4, wherein: one side of the sand filtering net (51) far away from the roller (1) is provided with a driving sand filtering net (51) which moves up and down to a driving mechanism (6), the driving mechanism (6) comprises a shift lever (61), two round pins (62) connected on the shift lever (61), and a grooved pulley (63) connected with the round pins (62) in a sliding way, sheave (63) keep away from the arch on driving lever (61) one side, be used for protruding upper and lower slip and vertically be provided with deflector (65) and the first motor (66) of driving lever (61) pivoted of erecting the groove, first motor (66) are located outside casing (2), sheave (63) are close to deflector (61) one side and are equipped with four spout (64) that rotate the looks adaptation with round pin (62), deflector (65) bottom fixed connection is in thick liquid groove (54) inner wall, the terminal surface of sheave (63) highest point is equipped with "L" type backup pad (67), backup pad (67) and sand screen (51) fixed connection.

6. A sand screen as claimed in claim 5, wherein: the blocking piece comprises a movable plate (531) and slots, wherein the movable plate (531) is vertically arranged at the lowest position of the sand filtering net (51) and located outside the shell (2), the slots are fixed on the shell (2) and are arranged on two sides of the movable plate (531), the movable plate (531) is fixedly connected with the sand filtering net (51), the movable plate (531) can shield the sand outlet (52), one surface, facing the sand filtering net (51), of the movable plate (531) is attached to the outer wall of the shell (2), and two ends of the movable plate (531) are movably inserted into the slots up and down; a movable plate (533) is arranged on the movable plate (531), the movable plate (533) is positioned above the sand filtering net (51), one end of the movable plate (533) is hinged on the movable plate (531), and the other end of the movable plate (533) is movably connected on the movable plate (531) through a bolt.

7. A sand screen as defined in claim 6, wherein: four groups of driving mechanisms (6) are arranged below the sand filtering net (51).

8. A sand screen as defined in claim 6, wherein: the movable plate (531) is fixedly connected with a material guide plate (532) positioned at the lower end of the movable plate (533), and one end, far away from the movable plate (533), of the material guide plate (532) is arranged in a downward inclined mode.

9. Sand and rock separating apparatus comprising a sand screen according to any one of claims 1 to 8 and a discharge chute (7), characterised in that: and the discharge hole of the discharge chute (7) is communicated with a feed plate (13) of the sand filter.

10. A sand separation device according to claim 9, wherein: the bottom of the discharge chute (7) is provided with a slope (71) inclining towards the feed plate (13).