CN217106750U - Adjustable sand screening device - Google Patents

Abstract

The utility model discloses a sieve husky ware with adjustable, its characterized in that: the window screen comprises a sand baffle and at least two sand screening layers, wherein the sand screening layers comprise a first sand screening layer and a second sand screening layer, the sand baffle, the first sand screening layer and the second sand screening layer are sequentially arranged from the outer side to the inner side of a window, and the distance between the sand baffle and the first sand screening layer is adjustable; the sand blocking plate comprises a plurality of vertical sand blocking units arranged side by side, the first sand screening layer comprises a plurality of vertical groove-shaped sand screening units arranged side by side, the second sand screening layer comprises a plurality of vertical curve-shaped sand screening units arranged side by side, and the sand blocking plate and the first sand screening layer form a roundabout airflow path with multiple collisions relatively in the front and back direction. The utility model discloses ventilation design to the many areas that send out of sand and dust has the significance, has solved the heavy difficult problem of installing and the clearance of being not convenient for of traditional sand prevention tripe, and this sand sieving device simple to operate, rational in infrastructure, the aperture is adjustable, all has good suitability to the sand blown by the wind of desert area different degree.

Description

Adjustable sand screening device

Technical Field

The utility model relates to a sieve husky ware with adjustable, especially a sieve husky ware with adjustable be suitable for extreme sand blown by wind weather's vertical cycle is linear belongs to shutter technical field.

Background

The shutter structure originates from China and is mostly applied to ancient buildings in China, and the periodic linear sand screening layer is an extension type of the shutter structure.

The horizontal installation of shutter of traditional sand prevention shutter, it is simple and easy to hinder husky structure, and sand prevention performance is unsatisfactory, and the blade interval is little, and increase nature air inlet resistance, the blade clearance is piled up husky dirt easily and inconvenient washing, and the sand prevention shutter of great area is mostly bilayer structure, and the structure is heavy, is not convenient for install and later maintenance. The electric double-layer shutter has a complex structure, and the filter screen part is inconvenient to disassemble and clean.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the existing sand-proof shutter has the problem that the effect of blocking sand and dust and the cleaning convenience cannot be taken into consideration.

In order to solve the problem, the technical scheme of the utility model provides a sieve husky ware with adjustable, its characterized in that: the window screen comprises a sand baffle and at least two sand screening layers, wherein the sand screening layers comprise a first sand screening layer and a second sand screening layer, the sand baffle, the first sand screening layer and the second sand screening layer are sequentially arranged from the outer side to the inner side of a window, and the distance between the sand baffle and the first sand screening layer is adjustable;

the sand blocking plate comprises a plurality of sand blocking units which are vertically arranged side by side, an arc-shaped sunken part is arranged on one surface of each sand blocking unit, which is in contact with the wind sand, and used for retaining and sliding off part of the wind sand, and convex flow guide parts are arranged on two sides of each arc-shaped sunken part and used for guiding the other part of the wind sand to the first sand screening layer;

the first sand screening layer comprises a plurality of groove-shaped sand screening units which are vertically arranged side by side, the tail ends of the convex flow guide parts of the sand blocking plates are butted with the notches of the groove-shaped sand screening units, sand blown by the flow guide of the convex flow guide parts collides with the groove-shaped sand screening units and slides off, and the groove-shaped sand screening units are provided with first hook parts for intercepting the sand blown by the wind;

the second sand screening layer comprises a plurality of curve-shaped sand screening units which are vertically arranged side by side, hook parts II for intercepting wind sand are arranged on two sides of each curve-shaped sand screening unit, the direction of each hook part II faces the direction of the first sand screening layer, and the hook parts II and the curve-shaped sand screening units form a fork-shaped structure;

the sand baffle and the first sand screening layer are opposite to each other front and back to form a multi-collision circuitous airflow path.

Preferably, the sand blocking unit is a baffle plate in an inverted omega shape, the arc-shaped concave part is arranged in the middle of the bottom of the inverted omega-shaped baffle plate, and two side edges of the inverted omega-shaped baffle plate are used as convex flow guide parts.

Preferably, the groove-shaped sand screening unit is a U-shaped sand screening layer with hooks and comprises a first U-shaped groove, and the two ends of the notch of the first U-shaped groove are provided with first hook parts.

Preferably, the groove-shaped sand screening unit is a double-U-shaped sand screening layer with hooks, the double-U-shaped sand screening layer with hooks comprises a first U-shaped groove and a second U-shaped groove, hook-shaped parts are arranged at two ends of a notch of the first U-shaped groove, one end of the second U-shaped groove is connected with the bottom of the first U-shaped groove, the other end of the second U-shaped groove is a free end, and the first hook-shaped part is arranged on the outer side of the bottom of the second U-shaped groove.

Preferably, the notch of the second U-shaped groove is larger than that of the first U-shaped groove, and the depth of the second U-shaped groove is smaller than that of the first U-shaped groove.

Preferably, the groove-shaped sand screening unit is a double-U-shaped sand screening layer with hooks, the double-U-shaped sand screening layer with hooks comprises a first U-shaped groove and a second U-shaped groove, hook-shaped parts are arranged at two ends of a notch of the first U-shaped groove, one end of the second U-shaped groove is connected with the bottom of the first U-shaped groove, the other end of the second U-shaped groove is a free end, and the outer side of the bottom of the second U-shaped groove and the inner side of the free end are both provided with the first hook-shaped parts.

Preferably, the curved sand sieving unit is shaped like an 1/8 four-leaf rose line, and the second hook parts are arranged at two sides of the 1/8 four-leaf rose line.

Preferably, still including establishing the slide rail in window upper and lower both sides, the type of falling omega deep bead is vertical to be established between the slide rail of upper and lower both sides, and the type of falling omega deep bead slides and fixes a position along the slide rail and realizes the distance between sand blocking plate and the first screening sand layer and adjusts.

Preferably, the inverted omega-shaped wind deflector is fixed on different positions of the slide rail through a buckle to realize the positioning of the inverted omega-shaped wind deflector on the slide rail.

Preferably, the first sand screening layer and the second sand screening layer are welded and fixed on the inner side of the sand baffle.

The utility model also provides a sieve husky ware with adjustable another, its characterized in that: the window screen comprises a sand baffle and a first sand screening layer, wherein the sand baffle and the first sand screening layer are sequentially arranged from the outer side of a window to the inner side, and the distance between the sand baffle and the first sand screening layer is adjustable;

the sand blocking plate comprises a plurality of sand blocking units which are vertically arranged side by side, an arc-shaped concave part is arranged on one surface of each sand blocking unit, which is in contact with the wind sand, and is used for retaining and sliding off part of the wind sand, and convex flow guide parts are arranged on two sides of each arc-shaped concave part and used for guiding the other part of the wind sand to the first sand screening layer;

the first sand screening layer comprises a plurality of groove-shaped sand screening units which are vertically arranged side by side, the tail ends of the convex flow guide parts of the sand blocking plates are butted with the notches of the groove-shaped sand screening units, sand blown by the flow guide of the convex flow guide parts collides with the groove-shaped sand screening units and slides off, and the groove-shaped sand screening units are provided with first hook parts for intercepting the sand blown by the wind;

the sand baffle and the first sand screening layer are opposite to each other front and back to form a multi-collision circuitous airflow path.

Compared with the prior art, the beneficial effects of the utility model are that:

the inverted omega-shaped wind shield, the double U-shaped sand screening layer with the hooks and the 1/8 four-leaf rose linear sand screening layer of the utility model have complicated special-shaped structures, are tightly covered on the whole window plane, and are provided with grooves and hooks to provide enough area and space for intercepting and collecting sand;

the sand baffle and the two sand sieving layers of the utility model are vertically arranged, and gravity is utilized, thus being beneficial to the sedimentation and collection of sand and dust and improving the sand-blocking effect;

the inverted omega-shaped wind shield of the utility model is arranged in the slide rails of the upper and lower outer frames, the opening degree can be adjusted to adapt to different weather conditions through sliding, and the wind shield can be completely closed in extreme weather;

the 1/8 four-leaf rose linear sand screening layer of the utility model can adjust the installation distance according to the requirement, and is suitable for various industrial buildings under different climatic conditions;

the utility model has adjustable structure, and the sliding adjusting wind shield can deal with different sand degrees and particle sizes; the wind shield and the two types of sand screening layers can also be adjusted in size according to requirements, and are suitable for various installation modes such as outer edges, inner edges, embedding and the like;

the utility model discloses ventilation design to the many areas that send out of sand and dust has the significance, has solved the heavy difficult problem of installing and the clearance of being not convenient for of traditional sand prevention tripe, and this sand sieving device simple to operate, rational in infrastructure, the aperture is adjustable, all has good suitability to the sand blown by the wind of desert area different degree.

Drawings

FIG. 1 is a drawing showing the installation dimensions of an adjustable sand screen according to a first embodiment;

FIG. 2 is a cross-sectional view of a sand guard in an incompletely closed state according to an embodiment;

FIG. 3 is a cross-sectional view of a sand guard in a fully closed position according to an embodiment;

FIG. 4 is a schematic longitudinal section of an adjustable sand screen according to one embodiment;

FIG. 5 is a schematic longitudinal section of an adjustable sand screen according to a second embodiment;

FIG. 6 is a schematic cross-sectional view of an adjustable sand screen according to a second embodiment;

FIG. 7 is a schematic cross-sectional view of an adjustable sand screen according to a third embodiment;

FIG. 8 is a cross-sectional view of an adjustable sand screen according to a fourth embodiment.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 4, the utility model relates to a screening sand ware with adjustable specifically is a screening sand ware with adjustable be suitable for extreme sand blown by the wind weather vertical cycle is linear, and it constitutes and includes: the sand screen comprises a sand baffle 1, a first sand screening layer 2, a second sand screening layer 3 and a sliding rail 4. Keep off husky board 1, first screening sand layer 2 and second screening sand layer 3 and set gradually to the inboard by the window outside, first screening sand layer 2 and the 3 welded fastening of second screening sand layer are in the inboard of keeping off husky board 1.

Keep off husky board 1 and include a plurality of vertical husky units that set up side by side, keep off husky unit and the one side processing arc depressed part 11 of sand blown by the wind contact and be used for staying the landing with partial sand blown by the wind, the both sides of arc depressed part 11 are convex water conservancy diversion portion 12 with the first sand screening layer 2 of another part sand blown by the wind direction.

The sand blocking unit is a baffle plate with an inverted omega shape, the arc-shaped concave part 11 is arranged in the middle of the bottom of the inverted omega-shaped baffle plate, and two side edges of the inverted omega-shaped baffle plate are used as convex flow guide parts 12. Slide rail 4 installs the upper and lower both sides at the window frame, and the direction of slide rail 4 is along the inside and outside direction of window, and the axis of the type of falling omega deep bead is perpendicular with the window frame, through buckle vertical installation on the slide rail 4 of upper and lower both sides. The inverted omega-shaped wind shield slides along the slide rail 4 and is fixed on different positions of the slide rail 4 through buckles to adjust the distance between the sand blocking plate 1 and the first sand screening layer 2. The opening degree can be adjusted by sliding to adapt to different weather conditions, and the sand baffle 1 can be completely closed in extreme weather, as shown in fig. 3.

The first sand sieving layer 2 comprises a plurality of groove-shaped sand sieving units which are vertically arranged side by side, and the projection of the groove-shaped sand sieving units in the direction vertical to the sand sieving layer has no gap. The tail end of a convex flow guide part 12 of the sand baffle 1 is butted with a groove opening of the groove-shaped sand screening unit, sand blown by the wind guided by the convex flow guide part 12 collides with the groove-shaped sand screening unit and slides down, and a hook-shaped part I23 for intercepting the sand blown by the wind is processed on the groove-shaped sand screening unit.

The second sand screening layer 3 comprises a plurality of curve-shaped sand screening units which are vertically arranged side by side, hook parts 31 for intercepting wind sand are processed on two sides of each curve-shaped sand screening unit, and the hook parts 31 and the curve-shaped sand screening units form a fork-shaped structure. The curved sand screening unit is shaped like 1/8 four-leaf rose line, and the 1/8 four-leaf rose line-shaped sand screening unit has no gap in projection in the direction vertical to the sand screening layer. The second hook 31 is processed on both sides of 1/8 four-leaf rose line type, and the direction of the second hook 31 is towards the direction of the first sand sieving layer 2.

In this embodiment, the sand sieving unit with the concave groove is a sand sieving layer with a double U-shaped belt hook, the sand sieving layer with the double U-shaped belt hook comprises a first U-shaped groove 21 and a second U-shaped groove 22, hook parts 23 are processed at two ends of a notch of the first U-shaped groove 21, one end of the second U-shaped groove 22 is connected with the bottom of the first U-shaped groove 21, the other end of the second U-shaped groove 22 is a free end, and the first hook part 23 is processed at the outer side of the bottom of the second U-shaped groove 22. The notch of the U-shaped groove II 22 is larger than the notch of the U-shaped groove I21, and the depth of the U-shaped groove II 22 is smaller than that of the U-shaped groove I21. The distance between the adjacent U-shaped grooves I21 is equal to the size of the groove opening of the U-shaped grooves I21.

The embodiment is mainly suitable for the conditions that the wall is thick, the particle size of sand is rich, and the weather is extremely windy and sandy, such as the building outer wall with the thickness of 200mm, and the size of the specific implementation mode is shown in figure 1. The inverted omega-shaped wind shield and the double-U-shaped hooked sand screening layer form a roundabout airflow path with multiple collisions in a front-back opposite mode, the double-U-shaped sand screening layer and the 1/8 four-leaf rose linear sand screening layer are all hooked, and the inverted omega-shaped wind shield, the double-U-shaped sand screening layer and the 1/8 four-leaf rose linear sand screening layer have the functions of impacting sand and dust to lose momentum and guiding the sand and dust to flow to a next collision collection point, and are closely intercepted on a sand and dust movement path. The working process is as follows:

the air current receives the detention when strikeeing sand baffle 1, and the velocity of flow reduces, and some grains of sand receive the detention effect, and kinetic energy loss receives the downward landing of gravity influence. Under the action of inertia, air carries partial sand grains to continue to move and collides with the front edge of the first sand screening layer 2, the speed and the direction of the airflow and the sand grains are changed differently under the influence of inertia force and gravity, air and the entrained sand grains are subjected to gas-solid separation, partial sand grains lose the speed and slide down, and partial reverse movement collides with the leeward side of the sand blocking plate 1 again. Similarly, the sand after impact decelerates again, part falls and is discharged, part changes the moving direction again and moves towards the indoor direction, and the sand loses speed after being intercepted by the U-shaped groove and the first hook-shaped part 23 on the first sand sieving layer 2 and falls under the action of gravity. The airflow after four times of impact passes through a curve flow channel formed by the second sand screening layer 3, and the rest dust is intercepted and impacted by the second hook part 31 under the guidance of the curve edge of the sand screening layer, loses kinetic energy and slides down under the action of gravity.

The internal air flow enters the room through five flows of baffle detention, front end impact of the sand screening layer, leeward surface rebound of the baffle, hook groove drainage of the sand screening layer of one layer and filtering of the sand screening layer of the second layer, so that gas-solid separation is realized. The sand grains which are impacted and fall down in the five-section flow fall into the lower frame with the sand guide groove together and are discharged under the action of gravity. The air flow passes through the flow path, and must undergo five or more impacts, and cannot directly pass through a sand sieving layer, so that sufficient sand removal can be achieved.

Example two

As shown in fig. 5 and 6, the concave groove shaped sand sieving unit in the present embodiment is a U-shaped hooked sand sieving layer, and is a special form of the double U-shaped hooked sand sieving layer in the first embodiment, and includes a U-shaped groove one 21, hook portions one 23 are processed at two ends of a notch of the U-shaped groove one 21, the U-shaped hooked sand sieving layer is vertically welded between an upper outer frame and a lower outer frame, and the welding position is located at the inner side of the sand baffle 1.

The rest is the same as the first embodiment.

The embodiment is mainly suitable for the conditions that the wall thickness is moderate, the sand particle size composition is rich, and the wind sand severity is general.

EXAMPLE III

As shown in fig. 7, the utility model relates to a sieve husky ware with adjustable it constitutes and includes: the sand blocking plate comprises a sand blocking plate 1, a first sand screening layer 2 and a sliding rail 4. Keep off sand board 1 and first screening sand layer 2 and set gradually by the window outside to inboard, first screening sand layer 2 welded fastening is in the inboard of keeping off sand board 1.

Keep off husky board 1 and include a plurality of vertical husky units that set up side by side, keep off husky unit and the one side processing arc depressed part 11 of sand blown by the wind contact and be used for staying the landing with partial sand blown by the wind, the both sides of arc depressed part 11 are convex water conservancy diversion portion 12 with the first sand screening layer 2 of another part sand blown by the wind direction.

The sand blocking unit is a baffle plate with an inverted omega shape, the arc-shaped concave part 11 is arranged in the middle of the bottom of the inverted omega-shaped baffle plate, and two side edges of the inverted omega-shaped baffle plate are used as convex flow guide parts 12. Slide rail 4 installs the upper and lower both sides at the window frame, and the direction of slide rail 4 is along the inside and outside direction of window, and the vertical installation of the type of falling omega deep bead passes through the buckle between the slide rail 4 of upper and lower both sides. The inverted omega-shaped wind shield slides along the slide rail 4 and is fixed on different positions of the slide rail 4 through buckles to adjust the distance between the sand blocking plate 1 and the first sand screening layer 2.

The first sand screening layer 2 comprises a plurality of groove-shaped sand screening units which are vertically arranged side by side, the tail ends of the convex flow guide parts 12 of the sand baffle plates 1 are in butt joint with notches of the groove-shaped sand screening units, sand blown by the flow guide of the convex flow guide parts 12 collides with the groove-shaped sand screening units and slides down, and hook-shaped parts 23 used for intercepting the sand blown by the wind are processed on the groove-shaped sand screening units.

In this embodiment, the sand sieving unit with the concave groove is a sand sieving layer with a double U-shaped belt hook, the sand sieving layer with the double U-shaped belt hook comprises a first U-shaped groove 21 and a second U-shaped groove 22, hook parts 23 are processed at two ends of a notch of the first U-shaped groove 21, one end of the second U-shaped groove 22 is connected with the bottom of the first U-shaped groove 21, the other end of the second U-shaped groove 22 is a free end, and the first hook parts 23 are processed on the outer side of the bottom of the second U-shaped groove 22 and the inner side of the free end. The notch of the U-shaped groove II 22 is larger than the notch of the U-shaped groove I21, and the depth of the U-shaped groove II 22 is smaller than that of the U-shaped groove I21. The distance between the adjacent U-shaped grooves I21 is equal to the size of the groove opening of the U-shaped grooves I21. The double-U-shaped hooked sand screening layer is vertically welded between the upper outer frame and the lower outer frame of the window, and the welding position is located on the inner side of the sand blocking plate 1.

The embodiment is mainly suitable for the conditions that the wall body is thin, the sand content is low, and the sand blown by the wind is not serious in most of time.

Example four

As shown in fig. 8, the concave groove shaped sand sieving unit in the present embodiment is a U-shaped sand sieving layer with hooks, and is a special form of the double U-shaped sand sieving layer with hooks in the first embodiment, and includes a U-shaped groove one 21, wherein hook-shaped portions one 23 are processed at two ends of a notch of the U-shaped groove one 21, the U-shaped sand sieving layer with hooks is vertically welded between an upper outer frame and a lower outer frame, and the welding position is located at the inner side of the sand baffle 1.

The rest is the same as the embodiment.

The embodiment is mainly suitable for the condition that the sand prevention effect is poor when a single-layer periodic linear sand sieving layer is adopted, and is additionally arranged on the outer side of the existing shutter.

Claims (10)

1. The adjustable sand screening device is characterized in that: the screen comprises a sand baffle (1) and at least two sand screening layers, wherein each sand screening layer comprises a first sand screening layer (2) and a second sand screening layer (3), the sand baffle (1), the first sand screening layers (2) and the second sand screening layers (3) are sequentially arranged from the outer side of a window to the inner side, and the distance between the sand baffle (1) and the first sand screening layers (2) is adjustable;

the sand blocking plate (1) comprises a plurality of sand blocking units which are vertically arranged side by side, one surface of each sand blocking unit, which is in contact with the wind sand, is provided with an arc-shaped concave part (11) for retaining and sliding off part of the wind sand, and two sides of each arc-shaped concave part (11) are provided with convex flow guide parts (12) for guiding the other part of the wind sand to the first sand screening layer (2);

the first sand screening layer (2) comprises a plurality of groove-shaped sand screening units which are vertically arranged side by side, the tail ends of convex flow guiding parts (12) of the sand blocking plates (1) are butted with notches of the groove-shaped sand screening units, sand blown by the flow guiding parts (12) collides with the groove-shaped sand screening units and slides off, and hook-shaped parts I (23) for intercepting the sand blown by the wind are arranged on the groove-shaped sand screening units;

the second sand screening layer (3) comprises a plurality of curve-shaped sand screening units which are arranged vertically side by side, hook-shaped parts II (31) for intercepting wind sand are arranged on two sides of each curve-shaped sand screening unit, the direction of each hook-shaped part II (31) faces the direction of the first sand screening layer (2), and the hook-shaped parts II (31) and the curve-shaped sand screening units form a fork-shaped structure;

the sand blocking plate (1) and the first sand screening layer (2) are opposite to each other front and back to form a multi-collision circuitous airflow path.

2. The adjustable sand screen as recited in claim 1, further comprising: the sand blocking unit is a baffle plate with an inverted omega-shaped shape, the arc-shaped concave part (11) is arranged in the middle of the bottom of the inverted omega-shaped baffle plate, and two side edges of the inverted omega-shaped baffle plate are used as convex flow guide parts (12).

3. An adjustable sand screen as claimed in claim 1 or claim 2, wherein: the groove-shaped sand screening unit is a U-shaped sand screening layer with hooks and comprises a first U-shaped groove (21), and hook-shaped parts (23) are arranged at two ends of a groove opening of the first U-shaped groove (21).

4. An adjustable sand screen as claimed in claim 1 or claim 2, wherein: the groove-shaped sand screening unit is a double-U-shaped sand screening layer with hooks, the double-U-shaped sand screening layer with hooks comprises a first U-shaped groove (21) and a second U-shaped groove (22), hook-shaped parts (23) are arranged at two ends of a notch of the first U-shaped groove (21), one end of the second U-shaped groove (22) is connected with the bottom of the first U-shaped groove (21), the other end of the U-shaped groove is a free end, and the first hook-shaped part (23) is arranged on the outer side of the bottom of the second U-shaped groove (22).

5. The adjustable sand screen as recited in claim 4, further comprising: the notch of the U-shaped groove II (22) is larger than that of the U-shaped groove I (21), and the depth of the U-shaped groove II (22) is smaller than that of the U-shaped groove I (21).

6. An adjustable sand screen as claimed in claim 1 or claim 2, wherein: the groove-shaped sand screening unit is a double-U-shaped sand screening layer with hooks, the double-U-shaped sand screening layer with hooks comprises a first U-shaped groove (21) and a second U-shaped groove (22), hook parts (23) are arranged at two ends of a notch of the first U-shaped groove (21), one end of the second U-shaped groove (22) is connected with the bottom of the first U-shaped groove (21), the other end of the second U-shaped groove is a free end, and the outer side of the bottom of the second U-shaped groove (22) and the inner side of the free end are both provided with the hook parts (23).

7. An adjustable sand screen as claimed in claim 1 or claim 2, wherein: the curved sand sieving unit is shaped like 1/8 four-leaf rose line, and the second hook parts (31) are arranged at two sides of 1/8 four-leaf rose line.

8. The adjustable sand screen as recited in claim 2, further comprising: still including establishing slide rail (4) in both sides about the window, the baffle of falling omega type is vertical to be established between slide rail (4) of both sides about, and the baffle of falling omega type slides and fixes a position along slide rail (4) and realizes keeping off the distance between sand board (1) and first screening sand layer (2) and adjust.

9. The adjustable sand screen as recited in claim 8, further comprising: the baffle of the inverted omega type is fixed on different positions of the slide rail (4) through the buckles to realize the positioning of the baffle of the inverted omega type on the slide rail (4).

10. The adjustable sand screening device is characterized in that: the window screen comprises a sand baffle (1) and a first sand screening layer (2), wherein the sand baffle (1) and the first sand screening layer (2) are sequentially arranged from the outer side of a window to the inner side, and the distance between the sand baffle (1) and the first sand screening layer (2) is adjustable;

the sand blocking plate (1) comprises a plurality of sand blocking units which are vertically arranged side by side, one surface of each sand blocking unit, which is in contact with the wind sand, is provided with an arc-shaped concave part (11) for retaining and sliding off part of the wind sand, and two sides of each arc-shaped concave part (11) are provided with convex flow guide parts (12) for guiding the other part of the wind sand to the first sand screening layer (2);

the first sand screening layer (2) comprises a plurality of groove-shaped sand screening units which are vertically arranged side by side, the tail ends of convex flow guiding parts (12) of the sand blocking plates (1) are butted with notches of the groove-shaped sand screening units, sand blown by the flow guiding parts (12) collides with the groove-shaped sand screening units and slides off, and hook-shaped parts I (23) for intercepting the sand blown by the wind are arranged on the groove-shaped sand screening units;

the sand blocking plate (1) and the first sand screening layer (2) are opposite to each other front and back to form a multi-collision circuitous airflow path.

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