CN112604964A

CN112604964A - Screening sand device for construction

Info

Publication number: CN112604964A
Application number: CN202011563331.8A
Authority: CN
Inventors: 李雨昂; 王舒瀚
Original assignee: Anhui Xinhongsheng Decoration Engineering Co ltd
Current assignee: Anhui Xinhongsheng Decoration Engineering Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-06

Abstract

The invention belongs to the technical field of building construction, and particularly relates to a sand screening device for building construction. According to the invention, the sliding friction between two adjacent separating cylinders is utilized to prevent the separating cylinders and the outer walls of the filter screen plates from being blocked due to residual sand, and large-particle sand and stones are sent out from the discharge chute along with the rotation of the separating cylinders to avoid accumulation, so that the actual sand screening operation effect and the actual sand screening work efficiency of the device are improved.

Description

Screening sand device for construction

Technical Field

The invention relates to the technical field of building construction, in particular to a sand screening device for building construction.

Background

The building construction refers to production activities in the engineering construction implementation stage, is the construction process of various buildings, and also can be a process of changing various lines on a design drawing into a real object at a specified place, and comprises foundation engineering construction, main structure construction, roofing engineering construction, decoration engineering construction and the like, wherein sand is often mixed with other materials for use in the building construction process.

Actual general direct sand of transporting job site wherein the granule is not of uniform size, and it has the stone granule to mix, direct use can cause the damage and can influence the result of use of actual sand to other equipment, so generally can sieve husky operation before using sand, the screening sand device who uses among the prior art, the vibrations filter plate board of placing generally for the slope, constantly send into the top of vibrations filter plate board with husky raw materials, and make the fine sand pass filter plate board and fall, the large granule slides down along filter plate's inclined plane, but the in-process of actually carrying out the screening sand operation, the humidity of husky material is great, can cause the unable effectual sand screening operation that sieves of filter plate surface because bond between large granule sand and the fine sand, thereby make actual sand screening effect poor.

Disclosure of Invention

Based on the technical problem of the background art, the invention provides a sand screening device for building construction.

The invention provides a sand screening device for building construction, which comprises a treatment box, wherein the outer wall of the top of the treatment box is provided with a feeding pipe, the inside of the treatment box is provided with a sand screening mechanism, the inner wall of the bottom of the treatment box is detachably connected with a containing box, the sand screening mechanism is provided with separating cylinders which are distributed at equal intervals in the horizontal direction, the two ends of each separating cylinder are respectively and rotatably connected with the inner walls of the two sides of the treatment box, one end of each separating cylinder is in transmission connection with a driving mechanism, one side of the circumferential outer wall of each separating cylinder is provided with a penetrating mounting groove, the inner wall of each mounting groove is fixedly provided with a filter screen plate with an arc structure, the outer wall of one end of the treatment box, which corresponds to the separating cylinders, is provided with a discharge groove, the feeding pipe is fixed at one end, which is far away from the discharge groove, the top end of the circumferential outer wall of the separating cylinder rotates towards one end close to the discharge chute, and the circumferential outer wall of the separating cylinder is provided with a plurality of shifting grooves.

Preferably, a partition plate is fixed in the middle between the inner walls of the two ends of the separation cylinder and made of elastic materials, a filter cavity is formed between the partition plate and the filter screen plate, and a vibrator is connected in the middle of the outer wall of one side, away from the filter cavity, of the partition plate.

Preferably, limiting plates which are obliquely arranged are fixed on two sides of one end, far away from the partition plate, of the filter cavity, a gap is formed between one end, close to the partition plate, of each limiting plate and the outer wall of the partition plate, and one end, close to the partition plate, of each limiting plate inclines towards one side, close to the filter screen plate.

Preferably, the outer wall of one end of the partition board close to the filter screen board is fixed with first lugs distributed equidistantly, the outer wall of one end of the partition board close to the filter screen board is fixed with a plurality of second lugs, the first lugs and the second lugs are distributed at intervals, the first lugs and the second lugs are both arranged in a round platform-shaped structure, the length of the first lugs is greater than that of the second lugs, and the ends of the first lugs and the second lugs far away from the partition board are both arranged in an inward-concave arc-shaped structure.

Preferably, the inner wall of the bottom of the discharge chute is fixed with a guide plate, one end of the guide plate, which is far away from the treatment box, is inclined downwards, the inner wall of the top of the discharge chute is fixed with a baffle plate, and the baffle plate is arranged into an upwards arched arc structure.

Preferably, the position that is located between husky mechanism of sieve and the containing box in the processing case is provided with the mechanism of straining sand, and the spout has all been seted up to the bottom of processing case both ends inner wall, strain husky mechanism and set two connecting frames with spout top and bottom inner wall sliding connection, top and bottom between two connecting frames all are fixed with the filter screen, strain one side of husky mechanism and be provided with the cylinder of being connected with the connecting frame, strain husky opposite side of mechanism and be provided with a plurality of and connecting frame and spout inner wall connected's spring.

Preferably, the top of straining sand mechanism is provided with a plurality of air blowing mechanisms, and air blowing mechanism is provided with a plurality of vertical blowpipes of placing, be provided with between two adjacent blowpipes on the same terminal surface with two filter screen between sliding connection's mounting panel, the intermediate position of mounting panel is fixed with the installation pipe, the position that handles case both sides inner wall and blowpipe correspondence is fixed with fixed pipe, the one end of fixed pipe and the both ends inner wall of installation pipe all rotate through the bearing and are connected with the connecting pipe, the both sides intermediate position of blowpipe circumference outer wall all with the end connection of connecting pipe, the cross slot has been seted up with the position that the blowpipe corresponds in filter screen top, the one side of handling the case top far away from the inlet pipe is fixed with.

Preferably, the inner wall in undulant groove sets to the arc structure, and undulant groove reduces towards other end inner wall towards the one end inner wall degree of depth of direction of rotation gradually, and undulant groove is kept away from the tangential direction parallel arrangement that the one end inner wall of direction of rotation cut to one side and separate a section of thick bamboo outer wall and correspond the position, the top one side of blowing pipe and the circumference outer wall sliding connection who separates a section of thick bamboo.

Preferably, two connecting plates are fixed at two ends of the blowpipe between the filter screens, the outer walls of two sides of each connecting plate are fixedly connected with the inner walls of two sides of the processing box respectively, two sides of the circumferential outer wall of the blowpipe are slidably connected with the inner walls of two sides of the through groove respectively, and the width between the inner walls of two ends of the through groove is greater than the width between the outer walls of two ends of the blowpipe.

Preferably, the two ends of the circumferential outer wall of the blowpipe, which are positioned at the top of the sand filtering mechanism, are respectively fixed with a baffle, the bottom end of the baffle inclines towards one side far away from the through groove, and the baffle is arranged into an arc structure arched downwards.

The beneficial effects of the invention are as follows:

1. the utility model provides a screening sand device for construction, the screen cloth board that utilizes a plurality of separating a section of thick bamboo and corresponding position constitutes roll formula screening sand mechanism, husky raw materials constantly is stirred by the outer wall of separating a section of thick bamboo and stir groove friction, and move to the blown down tank direction along with the rotation of separating a section of thick bamboo, remove the upset of the husky raw materials constantly by pivoted separating a section of thick bamboo in-process, make fine sand constantly enter into separating a section of thick bamboo through the screen cloth board, and rotate at the screen cloth board and make fine sand spill when down, utilize two adjacent sliding friction of separating between a section of thick bamboo can avoid separating a section of thick bamboo and the outer wall of screen cloth board and remain husky and cause the jam, and big granule sand and stone are sent out along with separating a section of thick bamboo rotation and avoid piling up from the blown down tank, thereby improve device and actually.

2. The utility model provides a screening sand device for construction, the fine sand that screening mechanism top dropped is along radial fluctuation along with the baffle of continuous vibrations in the filter chamber, increase fine sand motion and air current motion intensity in the filter chamber on the one hand, in order to accelerate the dry of fine sand and avoid fine sand to cohere in separating a section of thick bamboo, on the other hand makes fine sand wear out from the filter plate and falls down, be distributed along with the baffle is undulant and fall down, filter plate piles up when avoiding fine sand to fall down, thereby improve the screening sand effect when actual operation, utilize the radius difference of first lug and second lug top arc wall and circumference outer wall, the vibrations difference that the first lug of cooperation and second lug length difference brought, and increase the air current motion effect in the filter chamber, and the distributed effect of unloading, thereby strengthen actual screening sand effect.

3. The utility model provides a screening sand device for construction, at the in-process that screening sand operation was carried out in the cooperation of screening sand mechanism and screening sand mechanism, the blowing pipe top slides with separating a section of thick bamboo outer wall, the top striking that divides the pipe through the drop messenger when just contacting the undulant groove of separating a section of thick bamboo outer wall is separated, in order to strike and avoid fine sand to cohere in separating a section of thick bamboo to separating a section of thick bamboo, blow to adjacent two through the blowing pipe between separating a section of thick bamboo in addition, upwards blow along undulant groove and avoid separating a section of thick bamboo's outer wall to cohere sand, and rock and improve the actual effect of blowing through the blowing pipe at undulant trench, thereby guarantee the efficiency and the actual screening sand effect that the device sieved sand operation.

Drawings

Fig. 1 is a schematic overall sectional structural view of a sand screening device for building construction according to the present invention;

FIG. 2 is a schematic side sectional view of a sand screening device for construction according to the present invention;

FIG. 3 is a schematic structural view of a partition cylinder of a sand sieving device for building construction according to the present invention;

FIG. 4 is a schematic diagram of a partition structure of a sand screening device for building construction according to the present invention;

FIG. 5 is a schematic view of a structure of a mounting pipe of a sand sieving device for building construction according to the present invention;

fig. 6 is a schematic side view of a trough of a sand screening device for building construction according to the present invention.

In the figure: 1 treatment box, 2 feeding pipes, 3 separating cylinders, 4 filter screen plates, 5 partition plates, 6 filter cavities, 7 toggle grooves, 8 discharge chutes, 9 guide plates, 10 containing boxes, 11 limiting plates, 12 vibrators, 13 first bumps, 14 second bumps, 15 connecting frames, 16 air cylinders, 17 filter screens, 18 blowing pipes, 19 connecting plates, 20 baffle plates, 21 mounting pipes, 22 fixing pipes, 23 connecting pipes, 24 through grooves, 25 exhaust pipes and 26 mounting plates.

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.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1

Referring to fig. 1-4, a sand sieving device for building construction comprises a processing box 1, a feeding pipe 2 is arranged on the outer wall of the top of the processing box 1, a sand sieving mechanism is arranged in the processing box 1, a containing box 10 is detachably connected to the inner wall of the bottom of the processing box 1, the sand sieving mechanism is provided with a separating cylinder 3 which is distributed at equal distance in the horizontal direction, two ends of the separating cylinder 3 are respectively connected with the inner walls of two sides of the processing box 1 in a rotating way, one end of the separating cylinder 3 is connected with a driving mechanism in a transmission way, one side of the peripheral outer wall of the separating cylinder 3 is provided with a penetrating mounting groove, the inner wall of the mounting groove is fixed with a filter screen plate 4 with an arc structure, a discharge groove 8 is arranged at the position of the outer wall of one end of the processing box 1 corresponding to the separating cylinder 3, the feeding pipe 2 is fixed at one end of the top of the processing box 1, which is far, the top end of the circumferential outer wall of the separating cylinder 3 rotates towards one end close to the discharge chute 8, and the circumferential outer wall of the separating cylinder 3 is provided with a plurality of shifting chutes 7;

in the process of using the device to screen sand in practice, the sand raw material is continuously fed into the processing box 1 from the feeding pipe 2, a rolling type sand screening mechanism is formed by a plurality of separating cylinders 3 and filter screen plates 4 at corresponding positions, the sand raw material is continuously stirred by the friction of the outer walls of the separating cylinders 3 and the stirring grooves 7, and the sand raw material is continuously turned over by the rotating separating cylinder 3 in the moving process along with the rotation of the separating cylinder 3 to move towards the direction of the discharge chute 8, so that the fine sand continuously enters the separating cylinder 3 through the filter screen plate 4, and the fine sand leaks out when the filter screen plate 4 rotates downwards, the sliding friction between two adjacent separating cylinders 3 can avoid the blocking caused by the residual sand on the outer walls of the separating cylinders 3 and the filter screen plate 4, and the sand and the stone of big granule are sent out along with separating a section of thick bamboo 3 rotation and avoid piling up from blown down tank 8 to improve the device and actually carry out the operation effect and the work efficiency of screening sand.

In the invention, a partition plate 5 is fixed in the middle position between the inner walls of two ends of a separation cylinder 3, the partition plate 5 is made of elastic materials, a filter cavity 6 is formed between the partition plate 5 and a filter screen plate 4, and a vibrator 12 is connected in the middle position of the outer wall of one side, far away from the filter cavity 6, of the partition plate 5, so that fine sand falling from the top of a screening mechanism can fluctuate in the radial direction in the filter cavity 6 along with the partition plate 5 which vibrates continuously, on one hand, the movement strength and the air flow movement strength of the fine sand in the filter cavity 6 are increased, the drying of the fine sand is accelerated, the fine sand is prevented from being bonded in the separation cylinder 3, on the other hand, when the fine sand penetrates out of the filter screen plate 4 and falls, the fine sand is scattered and falls along with the fluctuation of the partition plate 5, the accumulation of;

both sides of one end of the filter cavity 6, which is far away from the partition plate 5, are fixedly provided with inclined limiting plates 11, a gap is arranged between one end of each limiting plate 11, which is close to the partition plate 5, and the outer wall of the partition plate 5, one end of each limiting plate 11, which is close to the partition plate 5, inclines towards one side, which is close to the filter screen plate 4, and fine sand can conveniently penetrate through the filter screen plate 4 and fall from the bottom by utilizing the material guiding operation of the limiting plates 11;

the outer wall of one end of the partition plate 5 close to the filter screen plate 4 is fixed with first lugs 13 distributed at equal intervals, the outer wall of one end of the partition plate 5 close to the filter screen plate 4 is fixed with a plurality of second lugs 14, the first lugs 13 and the second lugs 14 are distributed at intervals, the first lugs 13 and the second lugs 14 are both arranged into a circular truncated cone-shaped structure, the length of the first lugs 13 is greater than that of the second lugs 14, the ends of the first lugs 13 and the second lugs 14 far away from the partition plate 5 are both arranged into an inward-concave arc-shaped structure, so that the first lugs 13 and the second lugs 14 vibrate along with the partition plate 5, the vibration difference of fine sand vibrating along with the vibration of the partition plate 5 is increased by utilizing the radius difference of arc grooves at the tops of the first lugs 13 and the second lugs 14 and the outer wall of the circumference, and the air flow movement effect in the filter cavity 6 is increased by matching with the vibration difference caused by the length difference of the first, and the distributed effect of blanking, thus strengthen the actual sand screening effect;

a material guide plate 9 is fixed on the inner wall of the bottom of the discharge chute 8, one end, far away from the treatment box 1, of the material guide plate 9 is arranged in a downward inclined mode, a shielding plate is fixed on the inner wall of the top of the discharge chute 8, and the shielding plate is arranged into an upwards arched arc structure, so that discharging operation is facilitated, and sand scattering is avoided;

position that is located between husky mechanism of sieve and the containing box 10 in handling case 1 is provided with the mechanism of straining sand, the spout has all been seted up to the bottom of handling case 1 both ends inner wall, the mechanism of straining sand sets to two connection frame 15 with spout top and bottom inner wall sliding connection, top and bottom between two connection frame 15 all are fixed with filter screen 17, one side of the mechanism of straining sand is provided with the cylinder 16 of being connected with connection frame 15, the opposite side of the mechanism of straining sand is provided with a plurality of springs of being connected with connection frame 15 and spout inner wall connection, the mechanism of straining sand that utilizes to separate 3 pivoted direction reciprocating motion of section of thick bamboo 3 to the fine sand that falls carries out the rescreening, can make because separation between the fine sand that humidity cohered, thereby get rid of moisture along with air current motion and further improve actual sieve husky effect.

Example 2

Referring to fig. 1-6, a sand screening device for building construction, the top of a sand filtering mechanism is provided with a plurality of blowing mechanisms, the blowing mechanisms are provided with a plurality of vertically arranged blowing pipes 18, a mounting plate 26 which is connected with two filter screens 17 in a sliding manner is arranged between two adjacent blowing pipes 18 on the same end surface, a mounting pipe 21 is fixed in the middle of the mounting plate 26, fixing pipes 22 are fixed in the positions, corresponding to the blowing pipes 18, of the inner walls of two sides of a processing box 1, one end of each fixing pipe 22 and the inner walls of two ends of each mounting pipe 21 are rotatably connected with a connecting pipe 23 through bearings, the middle positions of two sides of the circumferential outer wall of each blowing pipe 18 are connected with the end parts of the connecting pipes 23, the positions, corresponding to the blowing pipes 18, of the tops of the filter screens 17 are provided with through grooves 24, and an exhaust pipe 25;

the inner wall of the fluctuation groove 7 is set to be an arc structure, the depth of the inner wall of one end of the fluctuation groove 7 facing to the rotation direction is gradually reduced towards the inner wall of the other end, the inner wall of one end of the fluctuation groove 7 far away from the rotation direction is obliquely arranged in parallel with the tangential direction of the corresponding position of the outer wall of the separation barrel 3, one side of the top end of the blowing pipe 18 is in sliding connection with the circumferential outer wall of the separation barrel 3, in the process of carrying out sand screening operation by matching the sand filtering mechanism and the sand screening mechanism, the top end of the blowing pipe 18 slides with the outer wall of the separation barrel 3, when the fluctuation groove 7 of the outer wall of the separation barrel 3 is just contacted, the top end of the blowing pipe 18 is impacted on the separation barrel 3 through a drop so as to knock the inside of the separation barrel 3 and avoid fine sand from being bonded in the separation barrel 3, in addition, air is blown to the space between two adjacent separation barrels 3 through the blowing pipe 18, the fluctuation groove 7 upwards avoids the outer wall of, thereby ensuring the efficiency of the device for screening sand and the actual sand screening effect;

the two ends of the blowpipe 18 between the two filter screens 17 are both fixed with connecting plates 19, and the two side outer walls of the connecting plates 19 are respectively fixedly connected with the two side inner walls of the processing box 1, the two sides of the circumferential outer wall of the blowpipe 18 are respectively connected with the two side inner walls of the through groove 24 in a sliding manner, the width between the two end inner walls of the through groove 24 is greater than the width between the two end outer walls of the blowpipe 18, the two ends of the circumferential outer wall of the blowpipe 18, which are positioned at the top of the sand filtering mechanism, are both fixed with baffles 20, the bottom ends of the baffles 20 incline towards one side far away from the through groove 24, the baffles 20 are arranged into arc structures arched downwards, the baffle 20 and the connecting plates 19 stop operation to reduce the fine sand and directly fall down from the through groove 24 position, so as to ensure the use effect of the actual sand.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The sand screening device for building construction comprises a processing box (1), wherein an inlet pipe (2) is arranged on the outer wall of the top of the processing box (1), a sand screening mechanism is arranged in the processing box (1), and a storage box (10) is detachably connected to the inner wall of the bottom of the processing box (1), and is characterized in that the sand screening mechanism is provided with a separating cylinder (3) which is distributed equidistantly in the horizontal direction, the two ends of the separating cylinder (3) are respectively rotatably connected with the inner walls of the two sides of the processing box (1), one end of the separating cylinder (3) is connected with a driving mechanism in a transmission manner, one side of the circumferential outer wall of the separating cylinder (3) is provided with a penetrating mounting groove, the inner wall of the mounting groove is fixed with a filter screen plate (4) with an arc-shaped structure, a discharge groove (8) is formed in the position, corresponding to the outer wall of one end of the processing box (1) and the top of the inlet pipe (2) is fixed at, adjacent two sliding connection separates between a section of thick bamboo (3), sets up to the interval crisscross setting between filter plate (4) of separating a section of thick bamboo (3) outer wall, the top of separating a section of thick bamboo (3) circumference outer wall rotates towards being close to blown down tank (8) one end, and separates the circumference outer wall of a section of thick bamboo (3) and seted up a plurality of grooves (7) of stirring.

2. The sand screening device for building construction as claimed in claim 1, wherein a partition plate (5) is fixed at a middle position between inner walls of two ends of the partition cylinder (3), the partition plate (5) is made of elastic material, a filter cavity (6) is formed between the partition plate (5) and the filter screen plate (4), and a vibrator (12) is connected at a middle position of an outer wall of one side of the partition plate (5) far away from the filter cavity (6).

3. The sand screening device for building construction according to claim 2, wherein limiting plates (11) which are obliquely arranged are fixed on two sides of one end, far away from the partition plate (5), of the filter cavity (6), a gap is formed between one end, close to the partition plate (5), of each limiting plate (11) and the outer wall of the partition plate (5), and one end, close to the partition plate (5), of each limiting plate (11) is inclined towards one side, close to the filter screen plate (4).

4. The sand screening device for building construction according to claim 3, wherein first bumps (13) are fixed on the outer wall of one end of the partition plate (5) close to the screen plate (4) and are distributed equidistantly, a plurality of second bumps (14) are fixed on the outer wall of one end of the partition plate (5) close to the screen plate (4), the first bumps (13) and the second bumps (14) are distributed at intervals, the first bumps (13) and the second bumps (14) are both arranged in a circular truncated cone-shaped structure, the length of the first bumps (13) is greater than that of the second bumps (14), and the ends of the first bumps (13) and the second bumps (14) far away from the partition plate (5) are both arranged in an inwards-concave arc-shaped structure.

5. The sand screening device for building construction according to claim 1, wherein a material guide plate (9) is fixed on the inner wall of the bottom of the discharge chute (8), one end of the material guide plate (9) far away from the treatment box (1) is arranged in a downward inclined manner, and a baffle plate is fixed on the inner wall of the top of the discharge chute (8) and is arranged in an arc structure which is arched upwards.

6. The sand screening device for building construction according to any one of claims 2 to 4, wherein a sand filtering mechanism is arranged between the sand screening mechanism and the containing box (10) in the processing box (1), sliding grooves are formed in the bottoms of the inner walls of the two ends of the processing box (1), the sand filtering mechanism is provided with two connecting frames (15) which are slidably connected with the inner walls of the tops and the bottoms of the sliding grooves, a filter screen (17) is fixed at the tops and the bottoms between the two connecting frames (15), an air cylinder (16) connected with the connecting frames (15) is arranged on one side of the sand filtering mechanism, and a plurality of springs connected with the connecting frames (15) and the inner walls of the sliding grooves are arranged on the other side of the sand filtering mechanism.

7. The sand screening device for building construction according to claim 6, wherein a plurality of blowing mechanisms are arranged at the top of the sand filtering mechanism, the blowing mechanisms are provided with a plurality of vertically arranged blowing pipes (18), a mounting plate (26) which is slidably connected with the two filter screens (17) is arranged between two adjacent blowing pipes (18) on the same end surface, a mounting pipe (21) is fixed at the middle position of the mounting plate (26), a fixing pipe (22) is fixed at the position of the inner wall of the two sides of the treatment box (1) corresponding to the blowing pipes (18), one end of the fixing pipe (22) and the inner wall of the two ends of the mounting pipe (21) are rotatably connected with a connecting pipe (23) through a bearing, the middle positions of the two sides of the circumferential outer wall of the blowing pipes (18) are connected with the end part of the connecting pipe (23), a through groove (24) is arranged at the position of the top of the filter screens (17) corresponding to, an exhaust pipe (25) is fixed on one side of the top of the treatment box (1) far away from the feeding pipe (2).

8. The sand screening device for building construction according to claim 7, wherein the inner wall of the fluctuation groove (7) is provided in an arc structure, the depth of the inner wall of the fluctuation groove (7) is gradually reduced toward the inner wall of the other end toward one end of the rotation direction, the inner wall of the fluctuation groove (7) at the end far away from the rotation direction is obliquely arranged in parallel to the tangential direction of the position corresponding to the outer wall of the separation barrel (3), and the top end side of the blowing pipe (18) is slidably connected with the circumferential outer wall of the separation barrel (3).

9. The sand screening device for building construction according to claim 8, wherein a connecting plate (19) is fixed between the two filter screens (17) at both ends of the blowpipe (18), the outer walls of both sides of the connecting plate (19) are respectively fixedly connected with the inner walls of both sides of the treatment box (1), both sides of the circumferential outer wall of the blowpipe (18) are respectively slidably connected with the inner walls of both sides of the through groove (24), and the width between the inner walls of both ends of the through groove (24) is greater than the width between the outer walls of both ends of the blowpipe (18).

10. The sand screening device for building construction according to claim 9, wherein the baffles (20) are fixed to both ends of the circumferential outer wall of the blowpipe (18) at the top of the sand filtering mechanism, the bottom ends of the baffles (20) are inclined toward the side away from the through slot (24), and the baffles (20) are arranged in a downwardly arched arc structure.