CN114589093A

CN114589093A - Sand screening equipment for constructional engineering and working method thereof

Info

Publication number: CN114589093A
Application number: CN202210270168.9A
Authority: CN
Inventors: 何丽萍
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-06-07

Abstract

The invention relates to sand screening equipment for constructional engineering, which comprises a box body, wherein the inner wall of the bottom of the box body is rotatably connected with a main shaft, the top of the main shaft is fixedly provided with a cylinder, the inner wall of the bottom of the box body is fixedly provided with a motor, the motor and the main shaft are fixedly arranged between the motor and the inner walls of two sides of the cylinder, guide grooves are formed in the inner sides of the guide plates, guide blocks are slidably connected in the guide grooves, a first spring is fixedly arranged between the guide blocks and the inner walls of the bottom of the guide grooves, ejector rods are fixedly arranged at the tops of the guide blocks, screen meshes are fixedly arranged at the tops of the two ejector rods, a screw rod is rotatably connected to one side of the inner wall of the bottom of the box body, a sleeve block is connected to the screw rod in a threaded manner, a hack lever is fixedly arranged on the inner side of the sleeve block, a disc is fixedly arranged at the bottom of the hack lever, a plurality of sub-rods are fixedly arranged on the circumferential outer walls of the disc, a frame plate is fixedly arranged on the outer side of the frame lever, a roller shaft is rotatably connected with an orienting mechanism; the invention utilizes the wave-shaped screen to promote the screening of the screen, and simultaneously accelerates the screening by the up-and-down movement of the screen.

Description

Sand screening equipment for constructional engineering and working method thereof

Technical Field

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

Background

The building engineering refers to an engineering entity formed by the construction of various building constructions and their auxiliary facilities and the installation of lines, pipelines and equipment matched with them. The house building comprises a top cover, beam columns, walls, a foundation and a building body, wherein the roof cover, the beam columns, the walls and the foundation can form an internal space, so that the requirements of people on production, living, learning, public activities and the like are met, and the house building comprises a factory building, a theater, a hotel, a shop, a school, a hospital, a house and the like; the 'auxiliary facilities' refer to water towers, bicycle sheds, pools and the like which are matched with the house building. The 'installation of lines, pipelines and equipment' refers to the installation activities of the lines, pipelines and equipment such as electricity, water supply and drainage, communication, elevators and the like which are matched with the building construction and the auxiliary facilities thereof.

In ordinary building engineering, people all need to screen out fine sand for use, and people all hold the screening frame to screen sand usually, and large-scale building engineering generally screens fine sand through sand screening equipment, however, the screening efficiency of current sand screening equipment is lower, so the sand screening equipment for building engineering is provided to solve the problem.

In order to solve the problems, the invention provides sand screening equipment for constructional engineering.

Disclosure of Invention

The invention aims to overcome the problem of low screening efficiency in the prior art, and provides sand screening equipment for constructional engineering to solve the technical problem.

In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:

a sand screening device for construction engineering comprises a box body, wherein the inner wall of the bottom of the box body is rotatably connected with a main shaft through a bearing, the top of the main shaft is fixedly provided with a barrel through a bolt, the inner wall of the bottom of the box body is fixedly provided with a motor through a bolt, the motor and the main shaft are fixedly provided with a plurality of outlets, the inner walls of the bottom of the barrel body are fixedly provided with guide plates through bolts, the inner sides of the two sides of the barrel body are respectively provided with a guide plate, the inner sides of the guide plates are provided with guide grooves, guide blocks are slidably connected with the guide grooves, the same first spring is fixedly arranged between the guide blocks and the inner wall of the bottom of the guide grooves through bolts, the top of each guide block is fixedly provided with an ejector rod through a bolt, the top of each ejector rod is fixedly provided with the same screen through a bolt, the cross section of the screen is arranged in a wave shape, one side of the inner wall of the bottom of the box body is rotatably connected with a screw rod through a bearing, a sleeve block is in threaded connection, the inner side of the sleeve block is fixedly provided with a hack rod through a bolt, the hack lever bottom has the disc through the bolt fastening, and disc circumference outer wall has the branch pole that a plurality of ring array distribute through the bolt fastening, divides the pole outside to have the frame plate through the bolt fastening, and the frame plate inboard is connected with the roller through the bearing rotation, and the hack lever is connected with orientation mechanism, and the screw rod is connected with drive mechanism.

Preferably, drive mechanism includes the gear, and the gear cover is established and is fixed in on the main shaft, and the bottom half inner wall has the baffle through the bolt fastening, and the guide slot has been seted up at the baffle top, and sliding connection has the guide block in the guide slot, and the guide block top has the connecting rod through the bolt fastening, and the connecting rod inboard has the rack through the bolt fastening, and the rack is connected with the gear engagement, and one side welded fastening that the rack is close to the screw rod has the ratch, and the cover is established and is fixed with the fluted disc on the screw rod, and the fluted disc is connected with the ratch meshing.

Preferably, the orientation mechanism comprises an orientation plate, an orientation groove is formed in the inner side of the orientation plate, an orientation rod is connected in the orientation groove in a sliding mode, and the orientation rod and the rack rod are fixed through bolts.

Preferably, a plurality of evenly distributed posts are fixed at the bottom of the branch rod through bolts.

Preferably, a plurality of distributing springs are fixed on the circumferential outer wall of the post rod in a welding mode.

Preferably, the bottom of the barrel is fixedly welded with a ring plate, the bottom of the ring plate is provided with a ring groove, a plurality of movable blocks distributed in an annular array are connected in the ring groove in a sliding mode, the bottom of each movable block is fixedly provided with a supporting column through a bolt, and the supporting column and the inner wall of the bottom of the box body are fixedly provided with bolts.

Preferably, a discharge port is formed in one side of the box body, the support columns are sleeved with and fixed to the same material guide plate, and the material guide plate inclines downwards towards one side of the discharge port.

Preferably, a plurality of annular array's bin outlet is seted up to barrel circumference outer wall, and bin outlet top inner wall rotates through the bearing and is connected with two closure plates that are the splayed and distribute, and the arc wall of two symmetric distributions is seted up to bin outlet top inner wall, and sliding connection has the guide block in the arc wall, has same reset spring through the bolt fastening between guide block and the arc wall inner wall, through the bolt fastening between guide block and the closure plate that corresponds.

Preferably, the cylinder body is fixedly sleeved with a collecting ring, the top opening bottom of the collecting ring is closed, and the collecting ring is arranged below the discharge port.

Preferably, two the opposite one side of closing plate all is provided with a plurality of evenly distributed atress portion, and the atress portion cross-section sets up to the arc, and atress portion and closing plate structure as an organic whole, and the closing plate is whole to be located the end of closing plate.

Has the advantages that:

1, sand is put into a barrel body, a motor is started simultaneously, a motor output shaft drives a main shaft, the barrel body and a screen to rotate, the sand is scattered along the screen after being subjected to centrifugal force, the sand can be bumped in the scattering process due to the fact that the cross section of the screen is set to be wavy, screening of a sieve is promoted, meanwhile, a main shaft drives a synchronous gear to rotate, a gear is meshed with a rack, the rack is made to move back and forth along a guide groove along with a connecting rod and a guide block, then the rack is driven to move back and forth synchronously, the rack is meshed with a toothed disc and a screw rod to rotate forward and backward, under the action of threads, a sleeve block, a rack rod, a disc, a branch rod, a frame plate and a roll shaft are made to move up and down along with a directional groove along with the directional rod, pressure is applied to the screen through the roll shaft, and the screen is made to move downwards along with an ejector rod and the guide block, extrude first spring to under its reverse elasticity effect, the rebound that resets to improve screening efficiency, simultaneously, the roller can and take place rolling friction between the screen cloth, thereby reduces wearing and tearing and resistance each other, simultaneously, divides the pole can form the resistance to the sand, thereby promotes the motion of sand, thereby further improves screening efficiency.

2, be provided with a plurality of poles, can improve the separation effect to the sand, when the sand scatters along the screen cloth simultaneously, can form the collision with the different pole, thereby further promote screening efficiency, and be provided with the branch material spring, can be when the sand of difference strikes different branch material springs, divide the material spring to form not equidirectional and the deformation of size, then because the elasticity of self, kick-back the sand, thereby further promote the relative motion of sand, thereby improve screening efficiency.

3, fine sand falls through the screen mesh, namely falls onto the guide plate through the outlet, the fine sand falls from the discharge port, coarse sand gradually gathers at the edge of the screen mesh, partial coarse sand enters the discharge port along with the rotation of the cylinder body and pushes the two closing plates away, the two closing plates respectively rotate along the corresponding guide blocks and rotate along the arc-shaped groove, then a gap is formed between the two closing plates, the coarse sand can be discharged, the coarse sand falls into the collecting ring to be collected, thereby realizing the cleaning of the coarse sand on the screen mesh, preventing continuous work, leading to the coarse sand to block the screen mesh, further improving the screening efficiency, the closing plates are provided with stress parts, the cross sections of the stress parts are arranged into arc shapes, thereby improving the stress effect between the coarse sand and the closing plates, facilitating the coarse sand to push the closing plates away, when the closing plates are opened, the resistance to the coarse sand can be reduced through the outer arc surfaces of the stress parts, therefore, the coarse sand can be conveniently discharged, and the whole sealing plate is positioned at the tail end of the sealing plate, so that the coarse sand can conveniently enter the position between the two sealing plates.

Drawings

Fig. 1 is a schematic view of the overall structure of a sand screening apparatus for construction engineering according to the present invention;

FIG. 2 is a schematic view of the internal structure of a sand screening apparatus for construction engineering according to the present invention;

FIG. 3 is a schematic view of the internal structure of the barrel of the sand screening apparatus for construction engineering according to the present invention;

FIG. 4 is an enlarged schematic structural view of a sand screening apparatus for construction engineering at A of the present invention;

FIG. 5 is a schematic view of a sub-rod installation structure of the sand screening apparatus for construction engineering according to the present invention;

FIG. 6 is a schematic structural view of a transmission mechanism of the sand screening apparatus for construction engineering according to the present invention;

FIG. 7 is a schematic view of a pole structure of a sand screening apparatus for construction engineering according to the present invention;

FIG. 8 is an enlarged schematic structural view of a sand screening apparatus for construction engineering at the position B of the present invention;

FIG. 9 is a schematic structural view of a barrel of the sand screening apparatus for construction engineering according to the present invention;

FIG. 10 is an enlarged schematic view of sand screening apparatus for construction engineering at C of the present invention;

fig. 11 is a schematic structural view of a closing plate of the sand screening device for constructional engineering.

The reference numbers are as follows:

1. a box body; 2. a main shaft; 3. a motor; 4. a barrel; 5. screening a screen; 6. a guide plate; 7. a guide groove; 8. a guide block; 9. a first spring; 10. a top rod; 11. an outlet; 12. a screw; 13. sleeving a block; 14. a frame bar; 15. a disc; 16. separating rods; 17. a frame plate; 18. a roll shaft; 19. a gear; 20. a guide plate; 21. a guide groove; 22. a guide block; 23. a connecting rod; 24. a rack; 25. a rack bar; 26. a fluted disc; 27. a post rod; 28. a material distributing spring; 29. an orientation plate; 30. a directional tank; 31. an orientation bar; 32. a ring plate; 33. a ring groove; 34. a movable block; 35. a support pillar; 36. a material guide plate; 37. a discharge outlet; 38. a closing plate; 39. an arc-shaped slot; 40. a guide block; 41. a return spring; 42. a force receiving portion; 43. and a collecting ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The invention will be further illustrated with reference to the following figures 1 to 11 and examples:

in the embodiment, as shown in fig. 1-8, a sand screening device for construction engineering comprises a box body 1, a main shaft 2 is rotatably connected to the inner wall of the bottom of the box body 1 through a bearing, a cylinder 4 is fixed to the top of the main shaft 2 through bolts, a motor 3 is fixed to the inner wall of the bottom of the box body 1 through bolts, the motor 3 and the main shaft 2 are fixed through bolts, a plurality of outlets 11 are formed in the inner wall of the bottom of the cylinder 4, guide plates 6 are fixed to the inner walls of the two sides of the cylinder 4 through bolts, guide grooves 7 are formed in the inner sides of the guide plates 6, guide blocks 8 are slidably connected to the guide grooves 7, the same first spring 9 is fixed between the guide blocks 8 and the inner wall of the bottom of the guide grooves 7 through bolts, ejector rods 10 are fixed to the top of the guide blocks 8 through bolts, the tops of the ejector rods 10 penetrate through the guide plates 6, the same screen 5 is fixed to the tops of the two ejector rods 10 through bolts, and the cross section of the screen 5 is set to be wavy, one side of 1 bottom inner wall of box is rotated through the bearing and is connected with screw rod 12, threaded connection has a cover block 13 on the screw rod 12, the inboard hack lever 14 that has through the bolt fastening of cover block 13, hack lever 14 bottom has disc 15 through the bolt fastening, 15 circumference outer walls of disc have a plurality of ring array distribute divide the pole 16 through the bolt fastening, divide the pole 16 outside to have a frame plate 17 through the bolt fastening, frame plate 17 inboard is connected with roller 18 through the bearing rotation, hack lever 14 is connected with orientation mechanism, screw rod 12 is connected with drive mechanism.

Further, drive mechanism includes

gear

19, 19 covers of gear are established and are fixed in on

main shaft

2, 1 bottom inner wall of box has baffle 20 through the bolt fastening, guide slot 21 has been seted up at baffle 20 top, sliding connection has guide block 22 in the guide slot 21, guide block 22 top has connecting rod 23 through the bolt fastening, connecting rod 23 inboard has rack 24 through the bolt fastening,

rack

24 and 19 meshing of gear are connected, one side welded fastening that rack 24 is close to screw rod 12 has ratch 25, the cover is established and is fixed with fluted disc 26 on screw rod 12, fluted disc 26 and ratch 25 meshing are connected, can drive screw rod 12 through main shaft 2 and rotate.

Further, the orientation mechanism comprises an orientation plate 29, an orientation groove 30 is formed in the inner side of the orientation plate 29, an orientation rod 31 is connected in the orientation groove 30 in a sliding mode, and the orientation rod 31 and the rack bar 14 are fixed through a bolt, so that the rack bar 14 can be limited and moved.

Furthermore, a plurality of evenly distributed posts 27 are fixed at the bottom of the branch rod 16 through bolts, so that screening of the screen can be promoted.

Furthermore, a plurality of material distributing springs 28 are welded and fixed on the outer circumferential wall of the post rod 27, so that the screening effect can be improved.

Further, 4 bottom welded fastening of barrel has the crown plate 32, and annular 33 has been seted up to crown plate 32 bottom, and sliding connection has a plurality of ring array distribution's movable block 34 in annular 33, and there is support column 35 movable block 34 bottom through the bolt fastening, through the bolt fastening between support column 35 and the 1 bottom inner wall of box, can reduce bearing of main shaft 2, improve stability.

Further, a discharge port is formed in one side of the box body 1, the same material guide plate 36 is fixedly sleeved on the support columns 35, and the material guide plate 36 inclines downwards towards one side of the discharge port, so that fine sand can be discharged.

In this embodiment, refer to fig. 9-11, a plurality of annular array's bin outlet 37 is seted up to barrel 4 circumference outer wall, bin outlet 37 top inner wall is connected with two closure plates 38 that are splayed and distribute through the bearing rotation, two symmetric distribution's arc wall 39 is seted up to bin outlet 37 top inner wall, sliding connection has guide block 40 in the arc wall 39, there is same reset spring 41 through bolt fastening between guide block 40 and the arc wall 39 inner wall, pass through bolt fastening between guide block 40 and the closure plate 38 that corresponds, can carry out the ejection of compact to the coarse sand.

Further, the barrel 4 is sleeved with and fixed with a collecting ring 43, the bottom of the top opening of the collecting ring 43 is sealed, and the collecting ring 43 is arranged below the discharge port 37, so that the coarse sand can be collected.

Furthermore, the opposite surfaces of the two closing plates 38 are provided with a plurality of stress parts 42 which are uniformly distributed, the cross sections of the stress parts 42 are arc-shaped, the stress parts 42 and the closing plates 38 are of an integrated structure, and the closing plates 38 are integrally positioned at the tail ends of the closing plates 38, so that coarse sand discharging can be facilitated.

Sand is put into the cylinder 4, the motor 3 is started simultaneously, the output shaft of the motor 3 drives the main shaft 2, the cylinder 4 and the screen 5 to rotate, the sand is scattered along the screen 5 after being subjected to centrifugal force, the sand is bumpy in the scattering process due to the wavy cross section of the screen 5, screening of a screen is promoted, meanwhile, the main shaft 2 drives the gear 19 to rotate synchronously, the gear 19 is meshed with the rack 24, the rack 24 is driven to reciprocate along the guide groove 21 along the connecting rod 23 and the guide block 22, the rack rod 25 is driven to reciprocate synchronously, the rack rod 25 is meshed with the driving fluted disc 26 and the screw rod 12 to rotate positively and negatively, under the action of threads, the sleeve block 13, the rack rod 14, the disc 15, the branch rod 16, the frame plate 17 and the whole of the roll shaft 18 move up and down along the directional groove 30 along the directional rod 31, and the screen 5 is pressed through the roll shaft 18, make screen cloth 5 follow ejector pin 10 and guide block 8 together, the downstream extrudees first spring 9 to under its reverse elasticity effect, reset rebound, thereby improve screening efficiency, simultaneously, roll 18 can and screen cloth 5 between take place rolling friction, thereby reduce wearing and tearing and resistance each other, simultaneously, divide pole 16 can form the resistance to the sand, thereby promote the motion of sand, thereby further improve screening efficiency.

Further, be provided with a plurality of poles 27, can improve the separation effect to the sand, when sand scatters along screen cloth 5 simultaneously, can form the collision with different poles 27, thereby further promote screening efficiency, and be provided with branch material spring 28, can be when different sands strike different branch material springs 28, divide material spring 28 can form not equidirectional and the deformation of size, then because the elasticity of self, kick-back the sand, thereby further promote the relative motion of sand, thereby improve screening efficiency.

Further, fine sand falls through the screen 5, namely falls onto the guide plate 36 through the outlet 11, and falls from the discharge hole, coarse sand gradually gathers at the edge of the screen 5, along with the rotation of the barrel 4, part of the coarse sand enters the discharge hole 37 and pushes the two closing plates 38 open, the two closing plates 38 rotate along the arc-shaped groove 39 along with the corresponding guide blocks 40 respectively, and then a gap is formed between the two closing plates 38, so that the coarse sand can be discharged, the coarse sand falls into the collecting ring 43 to be collected, thereby realizing the cleaning of the coarse sand on the screen 5, preventing the coarse sand from blocking the screen 5 and improving the screening efficiency, and the closing plates 38 are provided with the stress parts 42, the cross sections of the stress parts 42 are arranged into arc shapes, so that the stress effect between the coarse sand and the closing plates 38 can be improved, thereby facilitating the coarse sand to push the closing plates 38 open, when the closing plates 38 are opened, the resistance to the coarse sand is reduced by the outer curved surfaces of the force-receiving portions 42, so that the coarse sand is discharged easily, and the closing plates 38 are integrally located at the ends of the closing plates 38, so that the coarse sand can enter the position between the two closing plates 38 easily.

The working principle is as follows: when the sand screening machine is used, sand is thrown into the barrel body 4, the motor 3 is started at the same time, an output shaft of the motor 3 drives the main shaft 2, the barrel body 4 and the screen 5 to rotate, the sand is scattered along the screen 5 after being subjected to centrifugal force, the sand can bump in the scattering process due to the fact that the cross section of the screen 5 is wavy, screening of a screen is promoted, meanwhile, the main shaft 2 drives the gear 19 to rotate synchronously, the gear 19 is meshed with the rack 24, the rack 24 moves back and forth along the guide groove 21 along with the connecting rod 23 and the guide block 22, the rack 25 is driven to move back and forth synchronously, the rack 25 is meshed with the toothed disc 26 and the screw 12 to rotate forward and backward, the sleeve block 13, the rack rod 14, the disc 15, the branch rod 16, the frame plate 17 and the roll shaft 18 are integrated together and move up and down along with the directional rod 31, and the screen 5 is pressed through the roll shaft 18, so that the screen 5 moves downwards along with the top rod 10 and the guide block 8, and extrudes the first spring 9, and moves upwards by returning under the reverse elastic force, thereby improving the screening efficiency, and at the same time, the roll shaft 18 and the screen 5 generate rolling friction, thereby reducing the abrasion and resistance between each other, and at the same time, the branch rod 16 can generate resistance to sand, thereby promoting the movement of sand, thereby further improving the screening efficiency, and further, a plurality of column rods 27 are provided, thereby improving the separation effect of sand, and meanwhile, when sand is dispersed along the screen 5, the sand can collide with different column rods 27, thereby further promoting the screening efficiency, and the branch spring 28 is provided, namely, when different sands collide with different branch springs 28, the branch spring 28 can generate deformation in different directions and sizes, and further due to the elasticity of the branch spring 28, rebounding sand, further promoting relative movement of the sand, thereby improving screening efficiency, further, fine sand can fall through the screen 5, and can fall onto the guide plate 36 through the outlet 11, and can fall from the discharge hole, coarse sand can gradually gather at the edge of the screen 5, along with rotation of the cylinder 4, part of coarse sand can enter the discharge hole 37, and push the two closing plates 38 open, the two closing plates 38 respectively rotate along the arc-shaped groove 39 along with the corresponding guide blocks 40, then a gap is formed between the two closing plates 38, coarse sand can be discharged, coarse sand falls into the collecting ring 43 for collection, thereby realizing cleaning of coarse sand on the screen 5, preventing continuous work, and causing the coarse sand to block the screen 5, thereby improving screening efficiency, and the closing plates 38 are provided with the stress parts 42, the cross sections of the stress parts 42 are arranged into arc shapes, can improve the atress effect between coarse sand and the closing plate 38 to be convenient for the coarse sand to push away the closing plate 38, after the closing plate 38 was opened, can reduce the resistance to the coarse sand through the extrados of atress portion 42, thereby be convenient for the discharge of coarse sand, and the closing plate 38 wholly is located the end of closing plate 38, can be convenient for the coarse sand enter into the position between two closing plates 38.

The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.

Claims

1. The sand screening equipment for the building engineering comprises a box body (1) and is characterized in that a main shaft (2) is rotatably connected to the inner wall of the bottom of the box body (1), a barrel body (4) is fixedly connected to the top of the main shaft (2), a motor (3) is fixedly connected to the inner wall of the bottom of the box body (1), the motor (3) and the main shaft (2) are fixedly connected, a plurality of outlets (11) are formed in the inner wall of the bottom of the barrel body (4), guide plates (6) are fixedly connected to the inner walls of the two sides of the barrel body (4), guide grooves (7) are formed in the inner sides of the guide plates (6), guide blocks (8) are slidably connected in the guide grooves (7), the same first spring (9) is fixedly connected between the guide blocks (8) and the inner wall of the bottom of the guide grooves (7), ejector rods (10) are fixedly connected to the top of the guide blocks (8), the guide plates (6) run through the top of the ejector rods (10), the same screen (5) are fixedly connected to the top of the two ejector rods (10), the section of the screen (5) is arranged into a wave shape, one side of the inner wall of the bottom of the box body (1) is rotatably connected with a screw (12), the screw (12) is connected with a sleeve block (13) in a threaded manner, the inner side of the sleeve block (13) is fixedly connected with a rack rod (14), the bottom of the rack rod (14) is fixedly connected with a disc (15), a plurality of sub-rods (16) distributed in an annular array are fixedly connected with the outer circumferential wall of the disc (15), the outer side of each sub-rod (16) is fixedly connected with a rack plate (17), the inner side of each rack plate (17) is rotatably connected with a roller (18), the rack rod (14) is connected with an orienting mechanism, and the screw (12) is connected with a transmission mechanism.

2. The sand screening apparatus for construction engineering according to claim 1, wherein: drive mechanism includes gear (19), gear (19) cover is established and is fixed in on main shaft (2), box (1) bottom inner wall fixedly connected with baffle (20), guide slot (21) have been seted up at baffle (20) top, sliding connection has guide block (22) in guide slot (21), guide block (22) top fixedly connected with connecting rod (23), connecting rod (23) inboard fixedly connected with rack (24), rack (24) and gear (19) meshing connection, one side welded fastening that rack (24) are close to screw rod (12) has ratch (25), the cover is established and is fixed with fluted disc (26) on screw rod (12), fluted disc (26) and ratch (25) meshing connection.

3. The sand screening apparatus for construction works as set forth in claim 1, wherein: the orientation mechanism comprises an orientation plate (29), an orientation groove (30) is formed in the inner side of the orientation plate (29), an orientation rod (31) is connected in the orientation groove (30) in a sliding mode, and the orientation rod (31) is fixedly connected with the rack rod (14).

4. The sand screening apparatus for construction works as set forth in claim 1, wherein: the bottom of the branch rod (16) is fixedly connected with a plurality of evenly distributed pole rods (27).

5. The sand screening apparatus for construction works as set forth in claim 4, wherein: a plurality of material distributing springs (28) are fixed on the circumferential outer wall of the post rod (27) in a welding mode.

6. The sand screening apparatus for construction works as set forth in claim 1, wherein: barrel (4) bottom welded fastening has crown plate (32), and annular (33) have been seted up to crown plate (32) bottom, and sliding connection has a plurality of ring array distribution's movable block (34) in annular (33), and fixedly connected with support column (35) in movable block (34) bottom, fixed connection between support column (35) and box (1) bottom inner wall.

7. The sand screening apparatus for construction works as set forth in claim 6, wherein: the discharge gate has been seted up to box (1) one side, and a plurality of support columns (35) are gone up the cover and are established and be fixed with same stock guide (36), and stock guide (36) incline downwards towards discharge gate one side.

8. The sand screening apparatus for construction works as set forth in claim 1, wherein: barrel (4) circumference outer wall sets up bin outlet (37) that a plurality of annular array distribute, bin outlet (37) top inner wall rotates and is connected with two closing plates (38) that are the splayed distribution, arc wall (39) of two symmetric distributions are seted up to bin outlet (37) top inner wall, sliding connection has guide block (40) in arc wall (39), the same reset spring (41) of fixedly connected with between guide block (40) and arc wall (39) inner wall, fixed connection between guide block (40) and the closing plate (38) that corresponds.

9. The sand screening apparatus for construction works as set forth in claim 8, wherein: the utility model discloses a barrel, including barrel (4), collecting ring (43) open-top bottom are established to the cover and are fixed with, collecting ring (43) set up in the below of bin outlet (37), two the one side that closing plate (38) is relative all is provided with a plurality of evenly distributed's atress portion (42), and atress portion (42) cross-section sets to the arc, and atress portion (42) and closing plate (38) structure as an organic whole, and closing plate (38) whole are located the end of closing plate (38).

10. A method of operating a sand screening apparatus for construction works according to any one of claims 1 to 9, wherein: sand is put into a cylinder body (4), a motor (3) is started simultaneously, an output shaft of the motor (3) drives a main shaft (2), the cylinder body (4) and a screen (5) to rotate, the sand is scattered along the screen (5) after being subjected to centrifugal force, and the cross section of the screen (5) is set to be wave-shaped, so that the sand is bumped in the scattering process, screening of a screen is promoted, simultaneously, a gear (19) is synchronously driven by the main shaft (2) to rotate, the gear (19) is meshed with a rack (24), the rack (24) is driven by a connecting rod (23) and a guide block (22) to reciprocate along a guide groove (21), then a toothed rod (25) is synchronously driven to reciprocate, the toothed rod (25) is meshed with a driving toothed disc (26) and a screw rod (12) to rotate forwards and backwards, and under the action of threads, a sleeve block (13), a rack rod (14), a disc (15) and a disc (15), The whole of the branch rod (16), the frame plate (17) and the roll shaft (18) moves up and down along the directional groove (30) along with the directional rod (31), the screen (5) is pressed by the roll shaft (18), so that the screen (5) moves down along with the ejector rod (10) and the guide block (8), the first spring (9) is extruded, and the screen returns to move up under the reverse elasticity action, the screening efficiency is improved, meanwhile, the roll shaft (18) and the screen (5) have rolling friction, the abrasion and the resistance between the two are reduced, meanwhile, the branch rod (16) can form the resistance to sand, the movement of the sand is promoted, the screening efficiency is further improved, a plurality of column rods (27) are further arranged, the separation effect of the sand can be improved, and when the sand is scattered along the screen (5), the sand can collide with different column rods (27), thereby further promoting screening efficiency, and be provided with and divide material spring (28), can be when different sands strike different branch material springs (28), divide material spring (28) to form deformation of different direction and size, then because self elasticity, kick-back the sand, thereby further promote the relative motion of sand, thereby improve screening efficiency, furthermore, fine sand can fall down through screen cloth (5), can fall on baffle (36) through export (11), from the discharge gate blanking, coarse sand can gather gradually in the edge of screen cloth (5), along with the rotation of barrel (4), some coarse sand can enter into bin outlet (37), and push away two shut (38), two shut (38) are followed corresponding guide block (40) together respectively, the arc is rotated along groove (39), then form the clearance between two shut (38), can discharge the coarse sand, the coarse sand falls into and collects in collection ring (43), thereby realize the clearance to coarse sand on screen cloth (5), prevent continuous operation, lead to coarse sand to block up screen cloth (5), thereby improve screening efficiency, and be provided with atress portion (42) on closing plate (38), atress portion (42) cross-section sets the arc, can improve the atress effect between coarse sand and closing plate (38), thereby be convenient for coarse sand pushes away closing plate (38), after closing plate (38) is opened, can reduce the resistance to coarse sand through the extrados of atress portion (42), thereby be convenient for the discharge of coarse sand, and closing plate (38) whole are located the end of closing plate (38), can be convenient for the coarse sand to enter into the position between two closing plates (38).