Sand screening machine for intelligent engineering construction

By designing a sand screening machine for smart engineering construction, using components such as feed screws, fan blades and electric heating wires, the problem of large granular stones and wet sand is solved, efficient screening and drying is achieved, and sand quality and operating environment safety is improved.

CN120479737AInactive Publication Date: 2025-08-15ZHEJIANG LONGHUI TECH DEV CO LTD
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Patent Information

Application Number
CN202510814847.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-18
Publication Date
2025-08-15
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing sand screening equipment cannot effectively remove large granular stones and wet sand clusters, affecting the hardness and quality of the building.

Method used

A sand screening machine for smart engineering construction is designed, using components such as feed screws, motors, fan blades, electric heating wires, wedge rod rubber balls, slider brushes and dust collection boxes. They are screened and distributed through the rotation of feed screws, and are blown and dried by fan blades. The wedge rod rubber balls vibrate the feed pipe, and the slider brushes clean the screen holes, and the dust collection box collects dust.

Benefits of technology

Improve screening efficiency, avoid sand clumping, improve the quality of sand, reduce dust, and protect the operator's respiratory safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

The sand screening machine for intelligent engineering construction comprises a box body and a discharging opening formed in the box body, a screening pipe is installed at the top end of the box body, a motor is installed at one end of the screening pipe, a material conveying screw rod is installed on an output shaft of the motor, and the material conveying screw rod is located in the screening pipe; a feeding pipe is installed at the top of the screening pipe, a discharging pipe is installed at the bottom of one side of the screening pipe, screening holes are evenly distributed in the surface of the bottom of the screening pipe, a large gear is installed at one end of the conveying screw, a mounting frame is installed on the surface of one side of the screening pipe, and a small gear is installed on the end face of the mounting frame. By means of the arrangement of the structure, the material conveying screw rod can distribute raw materials, the screening efficiency is improved, meanwhile, the raw materials can be distributed, the caking phenomenon is avoided, and the screening quality of the raw materials is further improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering equipment, and in particular to a sand screening machine for intelligent engineering construction. Background Art

[0002] Sand is a building material used in construction. It is used in different buildings according to the sand's concentration and type. The fine sand raw material contains large particles of gravel. If there are too many of them, it will affect the hardness of the building and lead to poor building quality. The existing sand screening equipment is not effective, and the sand is moist, which causes the raw material to clump. There are also large particles of sand in the clumped sand, which are difficult to be screened out, thus affecting the quality of the sand. Summary of the Invention

[0003] The purpose of the present invention is to provide a sand screening machine for intelligent engineering construction to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a sand screening machine for intelligent engineering construction, comprising a box body and a discharge port installed inside the box body, a screening pipe installed on the top of the box body, a motor installed at one end of the screening pipe, a feeding screw installed on the output shaft of the motor, and the feeding screw is located inside the screening pipe, a feeding pipe is installed on the top of the screening pipe, a discharge pipe is installed on the bottom of one side of the screening pipe, and sieve holes are evenly distributed on the bottom surface of the screening pipe, a large gear is installed on one end of the feeding screw, a mounting frame is installed on the surface of one side of the screening pipe, and a small gear is installed on the end face of the mounting frame, the large gear and the small gear are meshed for transmission, and a fan blade is fixedly installed on the end face of the small gear, and an air guide bend pipe is interconnected on the top surface of the screening pipe, and one side of the air guide bend pipe is located on the outside of the fan blade, and an electric heating wire is installed inside the air guide bend pipe.

[0005] Preferably, a wedge-shaped rod rubber ball is installed on the mounting frame, a cam is installed on the surface of the large gear, and the cam is used in conjunction with the bottom of the wedge-shaped rod rubber ball.

[0006] Preferably, a reciprocating screw rod is installed at the bottom of the screen tube.

[0007] Preferably, a slider brush is installed on the surface of the reciprocating screw, and the slider brush is used in conjunction with the sieve hole.

[0008] Preferably, a connecting rod is installed on the surface of the large gear.

[0009] Preferably, a piston tube is installed on one side surface of the box body, and the movable part of the piston tube is connected to the connecting rod.

[0010] Preferably, the surfaces of the slider brushes are interconnected with air blower pipes, and the slider brushes are connected to the piston tube via a one-way valve hose.

[0011] Preferably, a dust collecting box is also installed on the surface of the box body, a dust extraction pipe is installed on the surface of the discharge pipe, and the dust extraction pipe is connected to the dust collecting box through a hose, and the dust collecting box is connected to the piston tube through a one-way valve hose.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a feeding screw, which inputs raw materials from a feed pipe through an external storage device, and starts the motor through an external electronic control component. The motor drives the coaxially connected feeding screw to rotate. The rotation of the feeding screw can transport the raw materials input from the feed pipe, and transport the raw materials from a low place to a high place as the feeding screw rotates. Since the bottom surface of the screening tube is evenly provided with sieve holes, the fine sand can be screened and filtered through the sieve holes and fall into the internal storage of the box, while larger particles of sand will be transported to the discharge pipe through the rotation of the feeding screw for discharge. The raw materials can be distributed by the rotation of the feeding screw, thereby improving the screening efficiency. At the same time, the raw materials can also be distributed to avoid the occurrence of agglomeration, thereby further improving the raw material screening quality.

[0013] The present invention provides fan blades, and the rotation of the feeding screw can also drive the large gear fixedly connected to the end face to rotate synchronously. The rotation of the large gear drives the meshing small gear to rotate. Since the number of teeth and the diameter of the large gear are greater than those of the small gear, it can drive the small gear to rotate quickly, that is, drive the fan blades coaxially connected to the small gear to rotate quickly. The rotation of the fan blades can draw air from one side and generate blowing air. The generated blowing air can be discharged from the air guide elbow and used in conjunction with the electric heating wire. The heat generated after the electric heating wire is energized is blown into the interior of the screening tube and discharged from the dust extraction pipe, so that the internal raw materials can be dried, the phenomenon of sand agglomeration is reduced, the feeding screw is convenient for distributing sand, and the screening effect of sand can be improved at the same time.

[0014] The present invention arranges a wedge-shaped rod rubber ball, and the rotation of the large gear drives the cam connected to the surface to rotate synchronously. Since the wedge-shaped rod rubber ball is installed on the mounting frame, and the cam is used in conjunction with the bottom of the wedge-shaped rod rubber ball, when the cam rotates, the bottom of the wedge-shaped rod rubber ball on the rotating path can be squeezed, so that it can poke upward and contact with the feed pipe, which can cause a certain vibration of the feed pipe box, accelerate the discharge of internal sand, and improve the acceleration efficiency.

[0015] The present invention provides a slider brush, and the rotation of the large gear drives the reciprocating screw connected to the pulley to rotate synchronously, and the reciprocating screw drives the slider brush used in conjunction with the surface to move back and forth. When the slider brush moves back and forth, the bottom of the screening tube can be cleaned by the hard bristles on the surface, and the inside of the screen hole can also be dredged, thereby reducing the blockage of raw materials.

[0016] The present invention provides an air blower pipe. When the large gear rotates, it can also drive the connecting rod connected to the surface to rotate. The connecting rod can drive the movable part of the piston tube connected to the rotation to move. When the movable part of the piston tube moves, it can drive the internal piston to squeeze or suck. During squeezing, the gas inside the piston tube can be transported to the air blower pipe connected to the one-way valve tube, and the sieve holes can be cleaned by blowing air, thereby further improving the cleaning effect of the sieve holes, reducing the effect of raw material blockage, and improving screening efficiency.

[0017] The present invention provides a dust collecting box. When the movable part of the piston tube drives the internal piston to suck, the dust collecting box connected to the one-way valve tube can be used to generate suction inside the dust collecting box, and the dust extraction pipe connected to the hose can be used to generate suction at the dust extraction pipe, and the material discharged from the discharge pipe can be simply sucked, thereby reducing the dust content in the large-grained sand and sucking the dust into the interior of the dust collecting box for temporary storage, thereby optimizing the processing environment, reducing dust diffusion to a certain extent, and protecting the operator's respiratory safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in FIG; Figure 4 For the present invention Figure 2 Schematic diagram of the local structure in; Figure 5 For the present invention Figure 4 Enlarged structural diagram of medium and large gears; Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point B.

[0019] In the figure: 1, box body; 101, discharge port; 2. Screening pipe; 201. Feeding pipe; 202. Motor; 203. Feeding screw; 204. Screen hole; 205. Discharging pipe; 3. Cam; 301. Mounting bracket; 302. Wedge rod rubber ball; 4. Large gear; 401. Small gear; 402. Fan blade; 403. Wind guide elbow; 404. Heating wire; 5. Connecting rod; 501. Piston tube; 502. Air jet tube; 503. Dust collection box; 504. Dust extraction tube; 6. Reciprocating screw; 601. Slider brush. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0023] Example 1

[0024] like Figures 1 to 3 As shown, the sand screening machine for smart engineering construction in this embodiment includes a box body 1 and a discharge port 101 installed inside the box body 1, a screening tube 2 is installed at the top of the box body 1, a motor 202 is installed at one end of the screening tube 2, a feeding screw 203 is installed on the output shaft of the motor 202, and the feeding screw 203 is located inside the screening tube 2, a feeding pipe 201 is installed on the top of the screening tube 2, a discharge pipe 205 is installed at the bottom of one side of the screening tube 2, and sieve holes 204 are evenly distributed on the bottom surface of the screening tube 2; Specifically, a large gear 4 is installed at one end of the feeding screw 203, a mounting frame 301 is installed on one side surface of the screening tube 2, and a small gear 401 is installed on the end face of the mounting frame 301, the large gear 4 is meshed with the small gear 401 for transmission, and a fan blade 402 is fixedly installed on the end face of the small gear 401, and an air guide bend 403 is interconnected on the top surface of the screening tube 2, and one side of the air guide bend 403 is located on the outside of the fan blade 402, and a heating wire 404 is installed inside the air guide bend 403.

[0025] When working: Figures 1 to 3 As shown, the raw materials are introduced from the feed pipe 201 through an external storage device, and the motor 202 is started by the external electronic control component. The motor 202 drives the coaxially connected feeding screw 203 to rotate. The rotation of the feeding screw 203 can transport the raw materials introduced by the feed pipe 201, and transport the raw materials from a low place to a high place as the feeding screw 203 rotates. Because the bottom surface of the screening tube 2 is evenly provided with sieve holes 204, the fine sand can be screened and filtered through the setting of the sieve holes 204 and fall into the internal storage of the box body 1, while the larger particles of sand will be transported to the discharge pipe 205 through the rotation of the feeding screw 203 for discharge. The raw materials can be distributed by the rotation of the feeding screw 203, thereby improving the screening efficiency. At the same time, the raw materials can be distributed to avoid the occurrence of agglomeration, thereby further improving the screening quality of the raw materials. like Figure 5 and Figure 4 As shown, the rotation of the feeding screw 203 can also drive the large gear 4 fixedly connected to the end face to rotate synchronously. The rotation of the large gear 4 drives the meshing small gear 401 to rotate. Since the number of teeth and the diameter of the large gear 4 are greater than those of the small gear 401, it can drive the small gear 401 to rotate quickly, that is, drive the fan blade 402 coaxially connected to the small gear 401 to rotate quickly. The rotation of the fan blade 402 can draw air from one side and generate blowing air. The generated blowing air can be discharged from the air guide elbow 403 and used in conjunction with the heating wire 404. The heat generated after the heating wire 404 is energized is blown into the interior of the screening tube 2 and discharged from the dust extraction pipe 504, so that the internal raw materials can be dried, the phenomenon of sand agglomeration is reduced, and the feeding screw 203 is convenient for the distribution effect of sand, while improving the screening effect of sand.

[0026] Example 2

[0027] On the basis of Example 1: like Figure 4 As shown, in this embodiment of the smart engineering construction sand screening machine, a wedge-shaped rod rubber ball 302 is further installed on the mounting frame 301, a cam 3 is installed on the surface of the large gear 4, and the cam 3 is used in conjunction with the bottom of the wedge-shaped rod rubber ball 302.

[0028] When working: Figure 4 As shown, based on the rotation of the large gear 4, the rotation of the large gear 4 drives the cam 3 connected to the surface to rotate synchronously. Since a wedge-shaped rod rubber ball 302 is installed on the mounting frame 301, and the cam 3 is used in conjunction with the bottom of the wedge-shaped rod rubber ball 302, when the cam 3 rotates, the bottom of the wedge-shaped rod rubber ball 302 on the rotating path can be squeezed, so that it can poke upward and contact with the feed pipe 201, which can cause a certain vibration of the feed pipe 201 box, accelerate the discharge of sand inside, and improve the acceleration efficiency.

[0029] Example 3

[0030] On the basis of Example 1: like Figure 3 and Figure 4 As shown, in the sand screening machine for smart engineering construction of this embodiment, a reciprocating screw 6 is further installed at the bottom of the screening tube 2, a slider brush 601 is installed on the surface of the reciprocating screw 6, and the slider brush 601 is used in conjunction with the sieve hole 204.

[0031] When working: Figure 3 and Figure 4 As shown, based on the rotation of the large gear 4, the rotation of the large gear 4 drives the reciprocating screw 6 connected to the pulley to rotate synchronously, and the reciprocating screw 6 drives the slider brush 601 used on the surface to move back and forth. When the slider brush 601 moves back and forth, the bottom of the screen tube 2 can be cleaned through the hard bristles on the surface, and at the same time, the inside of the screen hole 204 can be dredged to reduce the blockage of raw materials.

[0032] Example 4

[0033] Based on Examples 1 to 3: like Figure 4 and Figure 3 As shown, in this embodiment of the smart sand screening machine for engineering construction, further, a connecting rod 5 is installed on the surface of the large gear 4, a piston tube 501 is installed on the surface of one side of the box body 1, and the movable part of the piston tube 501 is connected to the connecting rod 5, and the surface of the slider brush 601 is interconnected with the air blower 502, and the slider brush 601 is connected to the piston tube 501 through a one-way valve hose.

[0034] When working: Figure 4 and Figure 3 As shown, based on the rotation of the large gear 4, the large gear 4 can also drive the connecting rod 5 connected to the surface rotation to rotate, and the connecting rod 5 can drive the movable part of the piston tube 501 connected to the rotation to move. When the movable part of the piston tube 501 moves, it can drive the internal piston to squeeze or suck. During squeezing, the gas inside the piston tube 501 can be transported to the air blower 502 connected to the one-way valve tube, and the sieve hole 204 can be cleaned by blowing air, thereby further improving the cleaning effect of the sieve hole 204, reducing the effect of raw material blockage, and improving screening efficiency.

[0035] Example 5

[0036] On the basis of Examples 1 to 4: like Figure 2 and Figure 4As shown, in the present embodiment of the smart engineering construction sand screening machine, a dust collecting box 503 is further installed on the surface of the box body 1, a dust extraction pipe 504 is installed on the surface of the discharge pipe 205, and the dust extraction pipe 504 is connected to the dust collecting box 503 through a hose, and the dust collecting box 503 is connected to the piston tube 501 through a one-way valve hose.

[0037] When working: Figure 2 and Figure 4 As shown, based on the movement of the movable part of the piston tube 501, when the movable part of the piston tube 501 drives the internal piston to suck, the dust box 503 connected by the one-way valve tube can be used to generate suction inside the dust box 503, and the dust extraction pipe 504 connected by the hose can be used to generate suction at the dust extraction pipe 504, and the material discharged from the discharge pipe 205 is simply sucked, thereby reducing the dust content in the large-grained sand, and the dust is sucked into the interior of the dust box 503 for temporary storage, thereby optimizing the processing environment, reducing dust diffusion to a certain extent, and protecting the operator's respiratory safety.

[0038] The working principle of the present invention is as follows: Figures 1 to 3 As shown, the raw materials are introduced from the feed pipe 201 through an external storage device, and the motor 202 is started by the external electronic control component. The motor 202 drives the coaxially connected feeding screw 203 to rotate. The rotation of the feeding screw 203 can transport the raw materials introduced by the feed pipe 201, and transport the raw materials from a low place to a high place as the feeding screw 203 rotates. Because the bottom surface of the screening tube 2 is evenly provided with sieve holes 204, the fine sand can be screened and filtered through the setting of the sieve holes 204 and fall into the internal storage of the box body 1, while the larger particles of sand will be transported to the discharge pipe 205 through the rotation of the feeding screw 203 for discharge. The raw materials can be distributed by the rotation of the feeding screw 203, thereby improving the screening efficiency. At the same time, the raw materials can be distributed to avoid the occurrence of agglomeration, thereby further improving the screening quality of the raw materials. like Figure 5 and Figure 4 As shown, the rotation of the feeding screw 203 can also drive the large gear 4 fixedly connected to the end face to rotate synchronously. The rotation of the large gear 4 drives the meshing small gear 401 to rotate. Since the number of teeth and the diameter of the large gear 4 are greater than those of the small gear 401, it can drive the small gear 401 to rotate quickly, that is, drive the fan blade 402 coaxially connected to the small gear 401 to rotate quickly. The rotation of the fan blade 402 can extract air from one side and generate blowing air. The generated blowing air can be discharged from the air guide elbow 403 and used in conjunction with the electric heating wire 404. The heat generated after the electric heating wire 404 is energized is blown into the interior of the screening tube 2 and discharged from the dust extraction pipe 504, so that the internal raw materials can be dried, the phenomenon of sand agglomeration is reduced, and the sand distribution effect of the feeding screw 203 is facilitated, while the sand screening effect can be improved. like Figure 4 As shown, on the basis of the rotation of the large gear 4, the rotation of the large gear 4 drives the cam 3 connected to the surface to rotate synchronously. Since a wedge-shaped rod rubber ball 302 is installed on the mounting frame 301, and the cam 3 is used in conjunction with the bottom of the wedge-shaped rod rubber ball 302, when the cam 3 rotates, it can squeeze the bottom of the wedge-shaped rod rubber ball 302 on the rotating path, so that it pokes upward and contacts the feed pipe 201, which can cause a certain vibration of the feed pipe 201 box, accelerate the discharge of sand inside, and improve the acceleration efficiency; like Figure 3 and Figure 4 As shown, on the basis of the rotation of the large gear 4, the rotation of the large gear 4 drives the reciprocating screw 6 connected to the pulley to rotate synchronously, and the reciprocating screw 6 drives the slider brush 601 used on the surface to move back and forth. When the slider brush 601 moves back and forth, the bottom of the screen tube 2 can be cleaned by the hard bristles on the surface, and the inside of the screen hole 204 can be dredged at the same time, thereby reducing the blockage of the raw material. like Figure 4 and Figure 3 As shown, on the basis of the rotation of the large gear 4, the large gear 4 can also drive the connecting rod 5 connected to the surface rotation to rotate, and the connecting rod 5 can drive the movable part of the piston tube 501 connected to the rotation to move. When the movable part of the piston tube 501 moves, it can drive the internal piston to squeeze or suck. When squeezing, the gas inside the piston tube 501 can be transported to the air jet pipe 502 connected to the one-way valve pipe, and the sieve hole 204 can be cleaned by blowing air, thereby further improving the cleaning effect of the sieve hole 204, reducing the effect of raw material clogging, and improving the screening efficiency. like Figure 2 and Figure 4 As shown, based on the movement of the movable part of the piston tube 501, when the movable part of the piston tube 501 drives the internal piston to suck, the dust box 503 connected by the one-way valve tube can be used to generate suction inside the dust box 503, and the dust extraction pipe 504 connected by the hose can be used to generate suction at the dust extraction pipe 504, and the material discharged from the discharge pipe 205 is simply sucked, thereby reducing the dust content in the large-grained sand, and the dust is sucked into the interior of the dust box 503 for temporary storage, thereby optimizing the processing environment, reducing dust diffusion to a certain extent, and protecting the operator's respiratory safety.

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sand screening machine for smart engineering construction, comprising a box body (1) and a discharge port (101) installed inside the box body (1), characterized in that: A screening tube (2) is installed at the top of the box (1), a motor (202) is installed at one end of the screening tube (2), a feeding screw (203) is installed on the output shaft of the motor (202), and the feeding screw (203) is located inside the screening tube (2), a feeding tube (201) is installed at the top of the screening tube (2), a discharge tube (205) is installed at the bottom of one side of the screening tube (2), and the bottom surface of the screening tube (2) is evenly distributed with sieve holes (204); A large gear (4) is installed at one end of the feeding screw (203), a mounting frame (301) is installed on one side surface of the screening tube (2), and a small gear (401) is installed on the end surface of the mounting frame (301), the large gear (4) and the small gear (401) are meshed and transmitted, and a fan blade (402) is fixedly installed on the end surface of the small gear (401), and an air guide bend (403) is interconnected on the top surface of the screening tube (2), and one side of the air guide bend (403) is located outside the fan blade (402), and an electric heating wire (404) is installed inside the air guide bend (403).

2. The sand screening machine for intelligent engineering construction according to claim 1, characterized in that: A wedge-shaped rod rubber ball (302) is mounted on the mounting frame (301), a cam (3) is mounted on the surface of the large gear (4), and the cam (3) cooperates with the bottom of the wedge-shaped rod rubber ball (302).

3. The sand screening machine for intelligent engineering construction according to claim 1, characterized in that: A reciprocating screw rod (6) is installed at the bottom of the screening tube (2).

4. The sand screening machine for intelligent engineering construction according to claim 3, characterized in that: A slider brush (601) is installed on the surface of the reciprocating screw (6), and the slider brush (601) is used in conjunction with the sieve hole (204).

5. The sand screening machine for intelligent engineering construction according to claim 1, characterized in that: A connecting rod (5) is mounted on the surface of the large gear (4).

6. The sand screening machine for intelligent engineering construction according to claim 5, characterized in that: A piston tube (501) is installed on one side surface of the box body (1), and the movable portion of the piston tube (501) is connected to the connecting rod (5).

7. The sand screening machine for intelligent engineering construction according to claim 4, characterized in that: The surfaces of the slider brushes (601) are interconnected with an air jet pipe (502), and the slider brushes (601) are connected to the piston tube (501) via a one-way valve hose.

8. The sand screening machine for intelligent engineering construction according to claim 1, characterized in that: A dust collecting box (503) is also installed on the surface of the box body (1), and a dust extraction pipe (504) is installed on the surface of the discharge pipe (205). The dust extraction pipe (504) is connected to the dust collecting box (503) through a hose, and the dust collecting box (503) is connected to the piston tube (501) through a one-way valve hose.