Screening machine for building construction

By using a screen plate design that is easy to disassemble and assemble and a servo motor-driven screening machine, the problem of cumbersome screen plate replacement is solved, achieving efficient screening and material classification, and improving construction efficiency and safety.

CN223669666UActive Publication Date: 2025-12-16朱靖
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Patent Information

Application Number
CN202520258617.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-18
Publication Date
2025-12-16
Estimated Expiration
2035-02-18

AI Technical Summary

Technical Problem

The existing screening machine has a complicated screen plate replacement process, which affects its efficiency and makes it difficult to adapt to different particle sizes and types of sand and gravel materials, resulting in low screening efficiency.

Method used

The design features an easy-to-disassemble and assemble screening plate structure. The screening plate can be quickly replaced and vibrated for screening through a support frame, limiting components, and servo motor-driven irregularly shaped push blocks. Combined with a guide plate and collection box, materials are classified and collected, and a dust collection system is provided to ensure a safe working environment.

Benefits of technology

It improves the flexibility and efficiency of the screening machine, extends the service life of the screening plate, enhances screening efficiency, and provides a healthy and safe working environment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of building construction machinery, and discloses a screening machine for building construction, the screening machine comprises a screening box, two symmetrical first sliding grooves are formed in the screening box, a feeding port is formed in the upper surface of the screening box, and connecting plates are slidably connected to the inner walls of the two first sliding grooves. According to the screening machine for building construction, under the action of the supporting frame, the limiting assembly and the screening plate, the screening plate can be inserted into the inner wall of the supporting frame, so that the screening plate is very simple and rapid to disassemble and assemble, and screening plates of different specifications can be easily replaced according to actual needs; and the screening plate and the supporting frame are stably connected through limiting of the limiting assembly, stable screening of the screening plate is ensured, meanwhile, the screening plate can be rapidly disconnected from the supporting frame through the limiting assembly, rapid disassembly and assembly are achieved, complex adjustment and preparation work are not needed, and the flexibility and the use efficiency of the equipment are greatly improved.
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Description

TECHNICAL FIELD

[0001] The application relates to the technical field of building construction machinery, in particular to a screening machine for building construction. BACKGROUND

[0002] In the building construction process, the screening machine is one of the indispensable equipment, which is mainly used for screening and grading various materials such as sand, gravel and concrete raw materials at the building construction site. Through screening, materials of different particle sizes can be separated to meet the needs of building construction for materials of different particle sizes, and play an important role in the building construction industry. In the building construction process, a large amount of sand and gravel and other building materials need to be used, which usually need to be screened to meet different construction requirements.

[0003] At present, the screening plate of the existing screening machine is usually fixed by bolts and other fasteners, and needs to be disassembled and assembled by using tools when replaced, which is complicated and time-consuming, not only affecting the use efficiency of the screening machine, but also increasing the labor intensity of workers, and the screening plate is difficult to replace. When the traditional screening machine faces sand and gravel materials of different particle sizes and types, complex adjustment and preparation work is often required, resulting in low screening efficiency. CONTENT OF THE INVENTION

[0004] In view of the deficiencies of the prior art, the application provides a screening machine for building construction, which has a screening plate design that is easy to disassemble and assemble, improves the flexibility and use efficiency of the equipment, and solves the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a screening machine for building construction, comprising a screening box, two symmetrical first sliding grooves are formed in the inside of the screening box, a feeding port is formed on the upper surface of the screening box, a connecting plate is slidably connected to the inner wall of the two first sliding grooves, two symmetrical support frames are fixedly connected to the outer surface of the connecting plate, a limiting assembly is arranged on the outer surface of the two support frames, the limiting assembly comprises two U-shaped frames fixedly connected to the outer surface of the support frame, a U-shaped rod is inserted into the inner wall of the two U-shaped frames, two symmetrical moving plates are fixedly connected to the outer surface of the two U-shaped rods, the outer surface of the moving plate is slidably connected to the inner wall of the U-shaped frame, an insertion block is fixedly connected to the bottom surface of the two moving plates, the outer surface of the insertion block is inserted into the inner wall of the support frame, two first springs are fixedly connected to the upper surface of the two moving plates, one end of the first spring away from the upper surface of the moving plate is fixedly connected to the outer surface of the U-shaped frame, a screening plate is inserted into the inner wall of the two support frames, and the outer surface of the two insertion blocks is inserted into the inner wall of the screening plate.

[0006] Through the above scheme, through the action of the supporting frame, the limiting component and the screening plate, the screening plate can be inserted on the inner wall of the supporting frame, so that the disassembly and assembly of the screening plate become very simple and fast, and different specifications of the screening plate can be easily replaced according to actual needs, and the limiting of the limiting component enables the stable connection of the screening plate and the supporting frame, ensures the stable screening of the screening plate, and the limiting component can facilitate the quick disconnection of the screening plate and the supporting frame, so that the quick disassembly and assembly are realized, thereby without complex adjustment and preparation work, and the flexibility and use efficiency of the equipment are greatly improved.

[0007] Further, the inner wall of the screening box is provided with two symmetrical second sliding grooves, the inner walls of the two second sliding grooves are both slidingly connected with moving blocks, the outer surfaces of the moving blocks are fixedly connected to the outer surface of the supporting frame, the outer surfaces of the two moving blocks are both fixedly connected with second springs, one end of the second spring away from the outer surface of the moving block is fixedly connected to the inner wall of the second sliding groove, and the bottom surface of the connecting plate is fixedly connected with two third springs, one end of the third spring away from the bottom surface of the connecting plate is fixedly connected to the inner wall of the first sliding groove.

[0008] Through the above scheme, through the action of the first sliding groove and the second sliding groove, the connecting plate and the moving block can be guided, so that the movement of the supporting frame and the screening plate is synchronously guided, the screening plate is stably screened, and the buffering action of the third spring can avoid the direct impact of the material on the screening plate, thereby improving the service life of the screening plate.

[0009] Further, the upper surface of the connecting plate is fixedly connected with a protective pad, the outer surface of the screening box is fixedly embedded with a servo motor, the inner wall of the screening box is rotatably connected with a rotating shaft, one end of the output end of the servo motor is fixedly connected to the rotating shaft, and the other end of the rotating shaft is fixedly connected with a special-shaped push block.

[0010] Through the above scheme, through the action of the servo motor, the rotating shaft and the special-shaped push block, the start of the servo motor can drive the special-shaped push block to rotate, so as to extrude the protective pad, thereby pushing the connecting plate, the supporting frame and the screening plate to move, and the pushing of the third spring can make the screening plate vibrate, thereby improving the screening efficiency of the device.

[0011] Further, the inner wall of the screening box is fixedly connected with a first flow guide plate, and the inner wall of the screening box is fixedly connected with a second flow guide plate.

[0012] Through the above scheme, through the action of the first flow guide plate, the falling material can be buffered and guided, so as to avoid the direct impact of the material on the screening plate, and through the action of the second flow guide plate, the material screened by the screening plate can be guided, so as to ensure the stable collection of the material.

[0013] Further, the inner wall of the screening box is slidably connected with two symmetrical collecting boxes.

[0014] Through the above scheme, through the effect of the collecting box, the two collecting boxes can classify and collect the qualified materials and unqualified materials after screening, which can greatly improve the resource recycling efficiency.

[0015] Further, the outer surface of the screening box is provided with an inspection opening, and the outer surface of the screening box is provided with a sealing door.

[0016] Through the above scheme, through the effect of the inspection opening and the sealing door, the inspection opening can facilitate the replacement of the screening plate by the worker, and the maintenance of the internal components, and then the sealing door can improve the sealing property of the inside of the screening box, so as to ensure that the materials cannot flow out from the inspection opening.

[0017] Further, the upper surface of the screening box is provided with an air inlet, the inner wall of the screening box is provided with a first dust separation plate, and the outer surface of the first dust separation plate is fixedly connected to the inner wall of the air inlet.

[0018] Through the above scheme, through the effect of the first dust separation plate, the air entering the inside of the screening box can be filtered, so as to avoid the contamination of the materials by dust and ensure the purity of the materials.

[0019] Further, the inner wall of the screening box is fixedly connected with a dust suction box, the inner wall of the dust suction box is fixedly connected with a communication pipe, one end of the communication pipe away from the inner wall of the dust suction box extends through the outer surface of the screening box to the inside of the screening box, the inner wall of the dust suction box is fixedly connected with a second dust separation plate, the outer surface of the screening box is fixedly connected with a fan, the suction port of the fan is fixedly connected to the outer surface of the dust suction box, and the inner wall of the dust suction box is slidably connected with a collecting disc.

[0020] Through the above scheme, through the effect of the fan, the second dust separation plate and the collecting disc, the suction force of the fan can pass through the dust suction box and the communication pipe to make the dust screened in the inside of the screening box enter the inside of the dust suction box, at this time, the dust is filtered by the second dust separation plate, so that the air is discharged and the dust is isolated and finally falls into the inside of the collecting disc for storage and collection, thereby ensuring the air circulation in the screening area, avoiding the accumulation of dust, and providing a more healthy and safe working environment for construction workers.

[0021] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0022] The building construction screening machine, through the action between the supporting frame, the limiting assembly and the screening plate, the screening plate can be inserted in the inner wall of the supporting frame, so that the disassembly and assembly of the screening plate become very simple and fast, and different specifications of the screening plate can be easily replaced according to actual needs, and the limiting of the limiting assembly enables the stable connection of the screening plate and the supporting frame, ensures the stable screening of the screening plate, and the limiting assembly can facilitate the quick disconnection of the screening plate and the supporting frame, so that the quick disassembly and assembly are realized, thereby without complex adjustment and preparation work, and the flexibility and use efficiency of the equipment are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a perspective view of the whole application;

[0024] Figure 2 It is a sectional view of the whole application;

[0025] Figure 3 It is a perspective view of the connecting plate and the supporting frame of the application;

[0026] Figure 4 It is a perspective view of the limiting assembly of the application;

[0027] Figure 5 It is a perspective view of the connecting plate, the protective pad plate and the servo motor of the application;

[0028] Figure 6 It is a perspective view of the dust collection box and the fan of the application.

[0029] In the drawings:

[0030] 1, screening box; 2, first chute; 3, connecting plate; 4, supporting frame; 5, limiting assembly; 501, U-shaped frame; 502, U-shaped rod; 503, moving plate; 504, plug; 505, first spring; 6, screening plate; 7, second chute; 8, moving block; 9, second spring; 10, third spring; 11, protective pad plate; 12, servo motor; 13, rotating shaft; 14, special-shaped push block; 15, first guide plate; 16, second guide plate; 17, collection box; 18, access hole; 19, sealing door; 20, dust collection box; 21, first dust separation plate; 22, communication pipe; 23, second dust separation plate; 24, fan; 25, collection disc. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0032] Please refer to Figure 2 , Figure 3 and Figure 4 , the embodiment of a building construction with a screening machine, including screening box 1, the inside of the screening box 1 is provided with two symmetrical first chute 2, the upper surface of the screening box 1 is provided with a feed inlet, the inner wall of the two first chute 2 is slidably connected with the connecting plate 3, the outer surface of the connecting plate 3 is fixedly connected with two symmetrical support frame 4, the outer surface of the two support frame 4 is provided with a limiting assembly 5, the limiting assembly 5 includes two U-shaped frame 501 fixedly connected to the outer surface of the support frame 4, the inner wall of the two U-shaped frame 501 is inserted with a U-shaped rod 502, the outer surface of the two U-shaped rod 502 is fixedly connected with two symmetrical moving plate 503, and the outer surface of the moving plate 503 is slidably connected to the inner wall of the U-shaped frame 501, the bottom surface of the two moving plate 503 is fixedly connected with the plug 504, and the outer surface of the plug 504 is inserted into the inner wall of the support frame 4, the upper surface of the two moving plate 503 is fixedly connected with two first spring 505, and the end of the first spring 505 away from the upper surface of the moving plate 503 is fixedly connected to the outer surface of the U-shaped frame 501, through the action of the first spring 505, the moving plate 503 can be always pushed to move, ensuring that the plug 504 is always inserted into the inside of the screening plate 6, so as to ensure the stable screening of the screening plate 6, the inner wall of the two support frame 4 is inserted with the screening plate 6, the outer surface of the two plug 504 is inserted into the inner wall of the screening plate 6, through the action between the support frame 4, the limiting assembly 5 and the screening plate 6, the screening plate 6 can be inserted and assembled in the inner wall of the support frame 4, so that the disassembly and assembly of the screening plate 6 become very simple and fast, and different specifications of the screening plate 6 can be easily replaced according to actual needs, and the limiting of the limiting assembly 5 makes the stable connection of the screening plate 6 and the support frame 4, ensuring the stable screening of the screening plate 6, at the same time, the limiting assembly 5 can facilitate the quick disconnection of the screening plate 6 and the support frame 4, so that the quick disassembly and assembly are realized, thus without complex adjustment and preparation work, the flexibility and use efficiency of the equipment are greatly improved.

[0033] Please refer to Figure 2 , Figure 3 and Figure 5The inner wall of the screening box 1 is provided with two symmetrical second sliding grooves 7, the inner wall of the two second sliding grooves 7 is slidably connected with a moving block 8, the outer surface of the moving block 8 is fixedly connected to the outer surface of the support frame 4, the outer surface of the two moving blocks 8 is fixedly connected with a second spring 9, one end of the second spring 9 away from the outer surface of the moving block 8 is fixedly connected to the inner wall of the second sliding groove 7, the bottom surface of the connecting plate 3 is fixedly connected with two third springs 10, one end of the third spring 10 away from the bottom surface of the connecting plate 3 is fixedly connected to the inner wall of the first sliding groove 2, through the setting of the first sliding groove 2 and the second sliding groove 7, the connecting plate 3 and the moving block 8 can be guided, thereby synchronously guiding the movement of the support frame 4 and the screening plate 6, ensuring that the screening plate 6 stably screens, and cooperating with the buffering effect of the third spring 10, the direct impact of the screening plate 6 by the material can be avoided, thereby improving the service life of the screening plate 6, the upper surface of the connecting plate 3 is fixedly connected with a protective pad 11, through the effect of the protective pad 11, the connecting plate 3 can be prevented from being worn, thereby improving the service life of the connecting plate 3, the outer surface of the screening box 1 is fixedly embedded with a servo motor 12, the inner wall of the screening box 1 is rotatably connected with a rotating shaft 13, the output end of the servo motor 12 is fixedly connected to one end of the rotating shaft 13, the other end of the rotating shaft 13 is fixedly connected with a special-shaped push block 14, through the setting of the servo motor 12, the rotating shaft 13 and the special-shaped push block 14, starting the servo motor 12 can drive the special-shaped push block 14 to rotate, thereby extruding the protective pad 11, thereby pushing the connecting plate 3, the support frame 4 and the screening plate 6 to move, and cooperating with the pushing of the third spring 10 can make the screening plate 6 vibrate, thereby improving the screening efficiency of the device.

[0034] Please refer to Figure 1 , Figure 2 and Figure 6The inner wall of the screening box 1 is fixedly connected with a first flow guide plate 15, and the inner wall of the screening box 1 is fixedly connected with a second flow guide plate 16. Through the action of the first flow guide plate 15, the falling material can be buffered and guided, so that the material does not directly impact the screening plate 6. Through the action of the second flow guide plate 16, the material screened by the screening plate 6 can be guided, so that the material is stably collected. The inner wall of the screening box 1 is slidably connected with two symmetrical collecting boxes 17. Through the action of the collecting box 17, the two collecting boxes 17 can classify and collect the qualified material and the unqualified material after screening, so that the resource recycling efficiency is greatly improved. The outer surface of the screening box 1 is provided with an access hole 18, and the outer surface of the screening box 1 is provided with a sealing door 19. Through the action of the access hole 18 and the sealing door 19, the access hole 18 can facilitate the replacement of the screening plate 6 by the worker, and the internal components can be easily maintained. Then the sealing door 19 can improve the sealing performance of the inside of the screening box 1, so that the material cannot flow out from the access hole 18. The upper surface of the screening box 1 is provided with an air inlet, and the inner wall of the screening box 1 is provided with a first dust separation plate 21. The outer surface of the first dust separation plate 21 is fixedly connected to the inner wall of the air inlet. Through the action of the first dust separation plate 21, the air entering the inside of the screening box 1 can be filtered, so that the material is not contaminated with dust, and the purity of the material is ensured. The inner wall of the screening box 1 is fixedly connected with a dust collection box 20, and the inner wall of the dust collection box 20 is fixedly connected with a communication pipe 22. One end of the communication pipe 22 away from the inner wall of the dust collection box 20 extends to the inside of the screening box 1 through the outer surface of the screening box 1. The inner wall of the dust collection box 20 is fixedly connected with a second dust separation plate 23. The outer surface of the screening box 1 is fixedly connected with a fan 24, and the suction port of the fan 24 is fixedly connected to the outer surface of the dust collection box 20. The inner wall of the dust collection box 20 is slidably connected with a collecting disc 25. Through the action of the fan 24, the second dust separation plate 23 and the collecting disc 25, the suction of the fan 24 can pass through the dust collection box 20 and the communication pipe 22 to make the dust screened in the inside of the screening box 1 enter the inside of the dust collection box 20. At this time, the dust is filtered by the second dust separation plate 23, so that the air is discharged and the dust is isolated and finally falls into the inside of the collecting disc 25 for storage and collection. Thus, the air flow in the screening area is ensured, the dust accumulation is avoided, and a more healthy and safe working environment is provided for the construction workers.

[0035] Through the action of the supporting frame 4, the limiting component 5 and the screening plate 6 in the embodiment, the screening plate 6 can be inserted in the inner wall of the supporting frame 4, so that the disassembly and assembly of the screening plate 6 become very simple and fast. Different specifications of the screening plate 6 can be easily replaced according to actual needs. The limiting of the limiting component 5 ensures the stable connection between the screening plate 6 and the supporting frame 4, so that the screening plate 6 can be stably screened. Meanwhile, the limiting component 5 can facilitate the quick disconnection of the screening plate 6 from the supporting frame 4, so that the screening plate 6 can be quickly disassembled and assembled. Thus, complex adjustment and preparation work is not needed, so that the flexibility and use efficiency of the equipment are greatly improved.

[0036] The working principle of the above embodiment is that the material to be screened is conveyed into the inside of the screening box 1 through the feed inlet above the screening box 1, and then the material is blocked and guided by the first flow guide plate 15, and can be slowly moved to the surface of the screening plate 6 to reduce impact, thereby improving the service life of the screening plate 6. Then, the servo motor 12 is started to drive the special-shaped push block 14 to rotate, thereby extruding the protective pad 11, pushing the connecting plate 3, the support frame 4 and the screening plate 6 to move, and cooperating with the third spring 10 and the second spring 9 to push the support frame 4 to reset. Under the repeated action, the screening plate 6 can vibrate, thereby improving the screening efficiency of the device. Then, when the material changes and the screening plate 6 needs to be replaced, the sealing door 19 is opened and the U-shaped rod 502 is pulled to move. At this time, the movement of the U-shaped rod 502 can drive the moving plate 503 and the plug block 504 to move. When the plug block 504 is separated from the inside of the screening plate 6, the screening plate 6 can be directly removed from the inside of the support frame 4. Then, the new screening plate 6 is inserted into the inside of the support frame 4. Then, under the push of the first spring 505, the moving plate 503 and the plug block 504 are automatically reset, thereby limiting and fixing the screening plate 6, ensuring the stable screening of the screening plate 6. Then, the screened material is guided by the second flow guide plate 16 to gather in one of the collecting boxes 17. Then, the material that does not pass the screening is guided by the screening plate 6 to enter the other collecting box 17, thereby forming classified collection. Finally, the fan 24 is started to convey the dust screened in the inside of the screening box 1 into the inside of the dust collection box 20 through the dust collection box 20 and the communication pipe 22. At this time, the dust is filtered by the second dust separation plate 23, so that the air is discharged and the dust is isolated and finally falls into the inside of the collecting disc 25 for storage and collection, thereby ensuring the air circulation in the screening area, avoiding dust accumulation, and providing a more healthy and safe working environment for construction workers.

[0037] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0038] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary and that changes can be made in detail without departing from the principles and spirit of the application. The scope of the application is therefore defined by the appended claims and their equivalents.

Claims

1. A screening plant for construction work, comprising a screening box (1), characterized in that: The inside of the screening box (1) is provided with two symmetrical first chutes (2), the upper surface of the screening box (1) is provided with a feeding port, the inner walls of the two first chutes (2) are slidably connected with connecting plates (3), the outer surfaces of the connecting plates (3) are fixedly connected with two symmetrical support frames (4), the outer surfaces of the two support frames (4) are provided with limiting assemblies (5), the limiting assemblies (5) comprise two U-shaped frames (501) fixedly connected to the outer surfaces of the support frames (4), U-shaped rods (502) are inserted into the inner walls of the two U-shaped frames (501), the outer surfaces of the two U-shaped rods (502) are fixedly connected with two symmetrical moving plates (503), the outer surfaces of the moving plates (503) are slidably connected to the inner walls of the U-shaped frames (501), the bottom surfaces of the two moving plates (503) are fixedly connected with plug blocks (504), the outer surfaces of the plug blocks (504) are inserted into the inner walls of the support frames (4), the upper surfaces of the two moving plates (503) are fixedly connected with two first springs (505), and the ends, away from the upper surfaces of the moving plates (503), of the first springs (505) are fixedly connected to the outer surfaces of the U-shaped frames (501), the inner walls of the two support frames (4) are inserted with screening plates (6), and the outer surfaces of the two plug blocks (504) are inserted into the inner walls of the screening plates (6).

2. A screening plant for construction work according to claim 1, characterized in that: The inner walls of the screening box (1) are provided with two symmetrical second chutes (7), the inner walls of the two second chutes (7) are slidably connected with moving blocks (8), the outer surfaces of the moving blocks (8) are fixedly connected to the outer surfaces of the support frames (4), the outer surfaces of the two moving blocks (8) are fixedly connected with second springs (9), and the ends, away from the outer surfaces of the moving blocks (8), of the second springs (9) are fixedly connected to the inner walls of the second chutes (7), the bottom surfaces of the connecting plates (3) are fixedly connected with two third springs (10), and the ends, away from the bottom surfaces of the connecting plates (3), of the third springs (10) are fixedly connected to the inner walls of the first chutes (2).

3. A screening plant for construction work according to claim 1, characterized in that: The upper surfaces of the connecting plates (3) are fixedly connected with protective cushion plates (11), the outer surfaces of the screening boxes (1) are fixedly embedded with servo motors (12), the inner walls of the screening boxes (1) are rotatably connected with rotating shafts (13), the output ends of the servo motors (12) are fixedly connected to one ends of the rotating shafts (13), and the other ends of the rotating shafts (13) are fixedly connected with special-shaped push blocks (14).

4. A screening plant for construction work according to claim 1, characterized in that: The inner walls of the screening boxes (1) are fixedly connected with first flow guide plates (15), and the inner walls of the screening boxes (1) are fixedly connected with second flow guide plates (16).

5. A screening plant for construction work as claimed in claim 1, wherein: The inner walls of the screening boxes (1) are slidably connected with two symmetrical collecting boxes (17).

6. A screening plant for construction work according to claim 1, characterized in that: The outer surfaces of the screening boxes (1) are provided with maintenance openings (18), and the outer surfaces of the screening boxes (1) are mounted with sealing doors (19).

7. A screening plant for construction work as claimed in claim 1, wherein: The upper surfaces of the screening boxes (1) are provided with air inlets, the inner walls of the screening boxes (1) are provided with first dust separation plates (21), and the outer surfaces of the first dust separation plates (21) are fixedly connected to the inner walls of the air inlets.

8. A screening plant for construction work according to claim 1, characterized in that: The inner wall of the screening box (1) is fixedly connected with a dust suction box (20), the inner wall of the dust suction box (20) is fixedly connected with a communication pipe (22), one end of the communication pipe (22) away from the inner wall of the dust suction box (20) extends through the outer surface of the screening box (1) to the inside of the screening box (1), the inner wall of the dust suction box (20) is fixedly connected with a second dust separation plate (23), the outer surface of the screening box (1) is fixedly connected with a fan (24), the air suction port of the fan (24) is fixedly connected to the outer surface of the dust suction box (20), and the inner wall of the dust suction box (20) is slidingly connected with a collecting disc (25).