Dust screen recovery device for constructional engineering

By designing a dustproof net recycling device for construction projects, the coordinated work of the rolling and winding components is used to realize the automatic recycling of dustproof nets, solving the problems of low recycling efficiency and poor winding tightness in the prior art, and improving the recycling efficiency and tightness.

CN222922567UActive Publication Date: 2025-05-30中建六局第四建设有限公司 +1
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Patent Information

Application Number
CN202421432339.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-21
Publication Date
2025-05-30
Estimated Expiration
2034-06-21

AI Technical Summary

Technical Problem

In the prior art, the recycling of dustproof nets mainly relies on manual operations, resulting in cumbersome operations, low efficiency and poor winding and poor winding effect, affecting the recycling efficiency.

Method used

A dustproof net recycling device for construction engineering is designed, including mounting base, rolling assembly, winding assembly, transmission assembly and power mechanism. Through the coordinated work of the rolling assembly and winding assembly, the automatic pulling of dustproof net is realized, and the tightening effect and recycling efficiency of winding are improved.

Benefits of technology

The automatic recycling of dustproof network is realized, the tight winding effect and recycling efficiency are improved, and the cumbersomeness and labor intensity of manual operations are reduced.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a building engineering dust screen recovery device which comprises a mounting base, a rolling and pulling assembly, a rolling assembly, a transmission assembly and a power mechanism controlling the rolling and pulling assembly to rotate, the two ends of the rolling and pulling assembly and the two ends of the rolling assembly are installed on the mounting base and are arranged in parallel in a spaced mode, and the transmission assembly is arranged on the mounting base. The rolling and pulling assembly is connected with the rolling assembly through the transmission assembly, when the rolling and pulling assembly is driven by a power mechanism to rotate, the dustproof net can be rolled and pulled to rotate along with the rolling and pulling assembly, the rolling assembly is driven by the transmission assembly to rotate, and therefore the dustproof net can be rolled. The dust screen recycling device for constructional engineering is ingenious and compact in structural design, a dust screen can be automatically pulled and wound, and the winding tight effect and the recycling efficiency are improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of construction equipment, in particular to a dust-proof net recycling device for construction projects. Background Art

[0002] A construction project refers to an engineering entity formed by the construction of various building houses and their ancillary facilities and the installation activities of pipelines and equipment supporting them. Among them, a building house refers to a project with a roof, beams, columns, walls, a foundation, and capable of forming an internal space to meet the needs of people's production, residence, study, and public activities. The dust-proof net is mainly an environmental protection measure for covering open-air building materials and construction waste to prevent dust.

[0003] At present, the recycling of the dust-proof net mainly relies on manual winding by personnel. For the staff, this not only has cumbersome operations, increasing the workload of the winding operators, but also has low efficiency and poor winding tightness effect, thus affecting the recycling efficiency.

[0004] In view of this, how to design a dust-proof net recycling device for construction projects that can solve the above technical problems is a topic that the inventor has painstakingly studied. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a dust-proof net recycling device for construction projects, the structure of which is ingenious and compact, and can automatically pull and wind the dust-proof net, improving the winding tightness effect and recycling efficiency.

[0006] To achieve the above purpose, the technical solution of the utility model is: a dust-proof net recycling device for construction projects, which includes a mounting seat, a winding and pulling assembly, a winding assembly, a transmission assembly, and a power mechanism for controlling the rotation of the winding and pulling assembly. Both ends of the winding and pulling assembly and both ends of the winding assembly are mounted on the mounting seat, and the two are arranged in parallel at intervals. The winding and pulling assembly is connected to the winding assembly through the transmission assembly. When the winding and pulling assembly rotates driven by the power mechanism, the dust-proof net can be wound and pulled to rotate with the winding and pulling assembly, and the winding assembly rotates driven by the transmission assembly, so as to wind the dust-proof net.

[0007] For the dust-proof net recycling device for construction projects of the utility model, the mounting seat includes a support plate arranged at intervals front and back and a bottom plate connected between the lower surfaces of the two support plates. Both ends of the winding and pulling assembly and both ends of the winding assembly are mounted on the two support plates, and the transmission assembly is mounted on the front support plate.

[0008] The present utility model relates to a dust-proof net recycling device for construction projects. The winding and pulling assembly includes a winding and pulling shaft, the front and rear ends of the winding and pulling shaft are respectively rotatably connected to two support plates through bearings, the outer surface of the winding and pulling shaft is fixedly connected with a rotating roller, the outer surface of the rotating roller is fixedly connected with a plurality of pulling cones, and the front end of the winding and pulling shaft is connected to the power mechanism.

[0009] The present utility model relates to a dust-proof net recycling device for construction projects. The power mechanism adopts a motor, the motor is installed on the support plate, and the output shaft of the motor is connected to the winding and pulling shaft.

[0010] The present utility model relates to a dust-proof net recycling device for construction projects. The transmission assembly includes a first pulley installed on the winding and pulling shaft, a second pulley installed on the winding assembly, and a belt installed on the first pulley and the second pulley.

[0011] The present utility model relates to a dust-proof net recycling device for construction projects. The winding assembly includes a winding shaft, a screw rod, and two top barrel cones. The rear end of the winding shaft is screwed to the screw rod, the front part of the winding shaft is fixedly connected to one of the top barrel cones, the rear end of the screw rod is fixedly connected to the other top barrel cone, the front end of the winding shaft is rotatably connected to a first sliding plate through a bearing, a horizontal first long hole is provided at a position corresponding to the first sliding plate on the front support plate, the first sliding plate is slidably arranged in the first long hole and can slide left and right in the first long hole, a first elastic element is provided between the left side wall of the first sliding plate and the left side wall of the first long hole, and the second pulley is installed on the winding shaft.

[0012] The present utility model relates to a dust-proof net recycling device for construction projects. The two top barrel cones are symmetrically arranged front and rear, and one end of a pressing plate made of a ductile material is respectively connected to the upper surfaces of the two top barrel cones for pressing the dust-proof net.

[0013] The present utility model relates to a dust-proof net recycling device for construction projects. It further includes a tensioning assembly. The tensioning assembly includes a vertical second long hole provided on the front support plate and a second sliding plate slidably installed in the second long hole. A rotating shaft is provided at the front end of the second sliding plate, a third pulley is installed on the rotating shaft, the belt is installed on the third pulley, and a second elastic element is provided between the upper wall of the second long hole and the upper surface of the second sliding plate.

[0014] The present utility model relates to a dust-proof net recycling device for construction projects, which further includes a top support assembly. The top support assembly is slidably installed on the two support plates. The top support assembly includes a lifting plate. Vertically arranged third long holes are respectively provided at the front and rear corresponding positions of the two support plates. The two ends of the lifting plate are slidably installed in the two third long holes. A top support shaft is installed at the upper end of the lifting plate. The lower end of the lifting plate is connected to a lifting part. Driven by an external power, the lifting part can move upward along the two third long holes, so that the top support shaft upwardly supports the dust-proof net, contacts the pulling cone on the winding and pulling assembly, and can rotate with the winding assembly.

[0015] The present utility model relates to a dust-proof net recycling device for construction projects, wherein the lifting part includes two push-pull plates and a lead screw. The upper ends of the two push-pull plates are hinged to the left and right parts of the lower end of the lifting plate. The lower ends of the two push-pull plates are respectively hinged to a hinge seat. Threaded holes are respectively provided on the two hinge seats. The lead screw is screwed through the two threaded holes and is rotatably installed on the two support plates.

[0016] After adopting the above scheme, the dust-proof net recycling device for construction projects of the present utility model has the following beneficial effects:

[0017] 1. The structure of the present utility model is ingenious and compact. Through the arranged winding and pulling assembly, tightening assembly and winding assembly, the winding assembly can wind the dust-proof net, and at the same time, the winding and pulling assembly drives the dust-proof net by pulling, so as to automatically pull and wind the dust-proof net covering the ground. At the same time, the tightening assembly can drive the winding assembly to always maintain a tightened state with the winding and pulling assembly, so as to ensure the tight winding effect of the winding shaft on the winding assembly for the dust-proof net, thereby improving the winding tightness effect and recycling efficiency.

[0018] 2. By arranging the rolling support assembly, the dust-proof net can be lifted and supported upward when passing between the winding and pulling assemblies, so as to avoid the lower swing of the dust-proof net not contacting the winding and pulling assembly and affecting the pulling and winding effect. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of an embodiment of the dust-proof net recycling device for construction projects of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the winding and pulling assembly of an embodiment of the dust-proof net recycling device for construction projects of the present utility model;

[0021] Figure 3 is a schematic structural diagram of the winding assembly of an embodiment of the dust-proof net recycling device for construction projects of the present utility model;

[0022] Figure 4It is a schematic structural diagram of a tightening component of an embodiment of a dust-proof net recycling device for construction engineering of the present utility model;

[0023] Figure 5 It is a schematic structural diagram of a top support component of an embodiment of a dust-proof net recycling device for construction engineering of the present utility model.

[0024] Number description:

[0025] 1 - mounting seat, 2 - support plate

[0026] 3 - bottom plate, 4 - winding shaft

[0027] 5 - roller, 6 - pulling cone

[0028] 7 - motor, 8 - switch

[0029] 9 - winding-up shaft, 10 - screw

[0030] 11 - top cylinder cone, 12 - pressing plate

[0031] 13 - first sliding plate, 14 - first long hole

[0032] 15 - first opening groove, 16 - spring

[0033] 17 - second long hole, 18 - second sliding plate

[0034] 19 - second opening groove, 20 - spring

[0035] 21 - rotating shaft, 22 - first pulley

[0036] 23 - second pulley, 24 - third pulley

[0037] 25 - belt, 26 - lifting plate

[0038] 27 - third long hole, 28 - limiting block

[0039] 29 - fixing plate, 30 - top support shaft

[0040] 31 - push-pull plate, 32 - lead screw

[0041] 33 - first hinge seat, 34 - second hinge seat

[0042] 35 - screw hole, 36 - handwheel Detailed implementation mode

[0043] The present utility model will be described below according to the embodiments shown in the drawings. The embodiments disclosed this time can be considered illustrative in all aspects and are not restrictive. The scope of the present utility model is not limited by the description of the following embodiments, but is only shown by the scope of the claims, and includes all variations having the same meaning as the scope of the claims and within the scope of the claims.

[0044] The structure of a dust-proof net recycling device for a building project of the present utility model will be described below in conjunction with specific embodiments.

[0045] As Figure 1 shown in the schematic structural diagram of an embodiment of a dust-proof net recycling device for a building project, it includes a mounting base 1, a winding component, a rewinding component, a tensioning component, a transmission component, a top support component, and a power mechanism for controlling the rotation of the winding component. The front and rear ends of the winding component and the front and rear ends of the rewinding component are both installed on the mounting base 1. The top support component is slidably installed on the mounting base 1. The winding component is connected to the rewinding component and the tensioning component through the transmission component. When the winding component rotates driven by the power mechanism, the dust-proof net can be wound and rotated along with the winding component, and the rewinding component rotates driven by the transmission component to wind the dust-proof net.

[0046] Specifically, referring to Figure 1 shown, the mounting base 1 includes support plates 2 arranged at intervals in the front and rear, and a bottom plate 3 fixedly connected between the lower surfaces of the two support plates 2. Four wheels are installed at the four corner positions on the lower surface of the bottom plate 3. The front and rear ends of the winding component and the front and rear ends of the rewinding component are both installed on the two support plates 2, and the transmission component is installed on the front support plate 2.

[0047] Referring to Figure 2 shown, the winding component includes a horizontally placed winding shaft 4. The front and rear ends of the winding shaft 4 are respectively rotatably connected to the two support plates 2 through bearings. The outer surface of the winding shaft 4 is fixedly connected with a roller 5, and a plurality of pulling cones 6 are uniformly fixed on the outer surface of the roller 5. The outer ends of each pulling cone 6 are designed with pointed tips. The front end of the winding shaft 4 is connected to the power mechanism. In this embodiment, the power mechanism is a motor 7, and the motor 7 is installed on the front support plate 2. The winding shaft 4 is fixedly connected to the output shaft of the motor 7. In this embodiment, a switch 8 for controlling the operation of the motor 7 is installed on the front support plate 2, and the motor 7 can be started by operating the switch 8.

[0048] Referring to Figure 3As shown in the figure, the rewinding assembly includes a rewinding shaft 9, a screw rod 10 and two top barrel cones 11. The rewinding shaft 9 is parallel and spaced from the winding shaft 4. The rear end of the rewinding shaft 9 is connected to the front end of the screw rod 10 by a threaded connection. The front part of the rewinding shaft 9 is fixedly connected to a top barrel cone 11, and the rear end of the screw rod 10 is fixedly connected to the other top barrel cone 11. The two top barrel cones 11 are symmetrically arranged front and rear. The upper surfaces of the two top barrel cones 11 are respectively connected to one end of a pressing plate 12 made of a ductile material. In this embodiment, the pressing plate 12 is approximately Z-shaped. The inner ends of the two pressing plates 12 press on the upper surface of the rewinding shaft 9, which is used to press the dust-proof net. The front end of the rewinding shaft 9 is rotatably connected to the first sliding plate 13 through a bearing. A horizontal rectangular first long hole 14 is provided at a position corresponding to the first sliding plate 13 on the front side support plate 2. The length of the first long hole 14 is greater than the length of the first sliding plate 13. The first sliding plate 13 is slidably arranged in the first long hole 14 and can slide left and right in the first long hole 14. A rectangular annular first opening groove 15 is provided on the outer edge of the first sliding plate 13. The left and right groove parts of the first opening groove 15 are clamped on the left and right side walls of the first long hole 14, and the upper and lower groove parts of the first opening groove 15 can clamp the upper and lower walls of the first long hole 14. The first sliding plate 13 can be integrally processed, or can be composed of a first rectangular plate and two second rectangular plates connected. The two second rectangular plates are clamped on the front and rear sides of the first rectangular plate, and the areas of the two second rectangular plates are larger than the area of the first rectangular plate. The outer edge of the whole formed by the connection of the three forms a rectangular annular first opening groove 15. In this embodiment, a first elastic element is installed between the left side wall of the first sliding plate 13 and the left side wall of the first long hole 14. The first elastic element in this embodiment uses a spring 16. Such a setting can make the spring 16 always push the first sliding plate 13 to slide to the right, so that the first sliding plate 13 drives the rewinding shaft 9 to move synchronously, maintaining the distance from the roller 5. In this way, the dust-proof net can be tightened, maintaining the tight winding effect of the rewinding shaft 9, thereby improving the recycling effect.

[0049] Reference Figure 4 As shown in the figure, the tightening assembly includes a vertical rectangular second long hole 17 provided on the front side support plate 2 and a second sliding plate 18 slidably installed in the second long hole 17. A rectangular annular second opening groove 19 is provided on the outer edge of the second sliding plate 18. The left and right groove parts of the second opening groove 19 are clamped on the left and right side walls of the second long hole 17, and the upper and lower groove parts of the second opening groove 19 can clamp the upper and lower walls of the second long hole 17. A second elastic element is installed between the upper wall of the second long hole 17 and the upper surface of the second sliding plate 18. The second elastic element in this embodiment uses a spring 20. A rotating shaft 21 is provided at the front end of the second sliding plate 18.

[0050] Reference Figure 1As shown in the figure, the transmission assembly includes a first pulley 22 mounted on the winding shaft 4, a second pulley 23 mounted at the front end of the winding shaft 9 of the winding assembly, a third pulley 24 mounted on the rotating shaft 21, and a belt 25 mounted on the first pulley 22, the second pulley 23, and the third pulley 24.

[0051] Reference Figure 5 As shown in the figure, the top support assembly includes a horizontally arranged lifting plate 26. Rectangular third long holes 27 in the vertical direction are respectively provided at the front and rear corresponding positions on the left sides of the two support plates 2 of the mounting seat 1. Limit blocks 28 are respectively provided at the front and rear ends of the lifting plate 26. The two ends of the lifting plate 26 pass through the two third long holes 27, and the two limit blocks 28 are clamped on the front and rear sides of the two support plates 2. The two limit blocks 28 can enable the lifting plate 26 to slide stably up and down in the two third long holes 27, thereby avoiding tilting and affecting the lifting movement. Fixing plates 29 are respectively provided on the front and rear parts of the upper surface of the lifting plate 26. The front and rear ends of the top support shaft 30 are respectively rotatably connected to the two fixing plates 29 through bearings. The lower end of the lifting plate 26 is connected to the lifting part. The lifting part includes two push-pull plates 31 and a lead screw 32. First hinge seats 33 are respectively provided on the left and right parts of the lower surface of the lifting plate 26. The two first hinge seats 33 are respectively hinged to the upper ends of the two push-pull plates 31 through pins. The lower ends of the two push-pull plates 31 are respectively hinged to the two second hinge seats 34 through pins. The two second hinge seats 34 are arranged symmetrically in the front and rear. Screw holes 35 are respectively provided on the two second hinge seats 34. The lead screw 32 is screwed through the two screw holes 35 and is rotatably mounted on the two support plates 2 through bearings provided at both ends. In this embodiment, two threads with opposite spiral directions are provided on the lead screw 32, and the two screw holes 35 are screwed onto the two threads with different spiral directions. A handwheel 36 is mounted at the front end of the lead screw 32 in this embodiment. By rotating the handwheel 36, the lead screw 32 can be driven to rotate. The rotation of the lead screw 32 can drive the two second hinge seats 34 to move away from or close to each other. The two second hinge seats 34 drive the two push-pull plates 31 to move synchronously, so that the two push-pull plates 31 simultaneously push the lifting plate 26 to rise along the two third long holes 27, so that the top support shaft 30 on the lifting plate 26 pushes the dust-proof net upward and contacts the pulling cone 6 on the winding assembly.

[0052] During use, the cylinder for winding the dust-proof net is sleeved on the winding shaft 9 of the winding assembly. At the same time, the two pressing plates 12 are pressed against the cylinder. Then, the rear top cylinder cone 11 is threadedly connected to the winding shaft 9 through the screw 10. At the same time, the rear top cylinder cone 11 abuts against the cylinder, forming a state of pressing the cylinder tightly from the front and back with the front top cylinder cone 11. Then, one end of the dust-proof net is sleeved on the cylinder, and the pressing plate 12 is pressed against the dust-proof net to press and fix it. Then, the handwheel 36 is rotated, so that the lead screw 32 rotates to drive the two second hinge seats 34 to move away from each other. The two second hinge seats 34 drive the two push-pull plates 31 to move synchronously, so that the two push-pull plates 31 simultaneously push the lifting plate 26 to rise, so that the top support shaft 30 on the lifting plate 26 propping up the dust-proof net contacts the pulling cone 6 on the winding and pulling assembly. After that, the motor 7 is started by controlling through the switch 8. The motor 7 drives the roller 5 on the winding shaft 4 to rotate, so that the rotating roller 5 drives the plurality of pulling cones 6 to drive and pull the dust-proof net. At the same time, the first pulley 22 on the winding shaft 4 drives the second pulley 23 and the winding shaft 9 on the winding assembly to rotate synchronously through the belt 25, so that the winding shaft 9 drives the cylinder to rotate to wind and wrap the dust-proof net. In this way, the dust-proof net can be automatically recycled. At the same time, during the rotation of the winding shaft 9, as the winding thickness of the cylinder increases, the distance between the roller 5 on the winding and pulling assembly and the winding shaft 9 is reduced, so as to drive the whole winding assembly to slide leftward to squeeze the spring 16. At the same time, the tightening assembly slides downward under the push of the spring 20 to tighten the belt 25, so as to maintain the tight winding effect of the dust-proof net. In this way, the winding operation can be continuously carried out.

[0053] In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0054] In the present invention, unless otherwise clearly specified and limited, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0055] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A dust-proof net recovery device for construction engineering, characterized in that: It includes a mounting seat, a rolling assembly, a winding assembly, a transmission assembly and a power mechanism for controlling the rotation of the rolling assembly. Both ends of the rolling assembly and both ends of the winding assembly are installed on the mounting seat, and the two are arranged in parallel and spaced apart. The rolling assembly is connected to the winding assembly through the transmission assembly. When the rolling assembly rotates driven by the power mechanism, the dustproof net can be rolled up and rotated with the rolling assembly. The winding assembly rotates driven by the transmission assembly, thereby the dustproof net can be rolled up.

2. A dust-proof net recovery device for construction engineering as claimed in claim 1, characterized in that: The mounting seat includes support plates arranged at a front-to-back interval and a bottom plate connected between the lower surfaces of the two support plates. Both ends of the rolling assembly and both ends of the winding assembly are installed on the two support plates, and the transmission assembly is installed on the front support plate.

3. A dust-proof net recovery device for construction engineering as claimed in claim 2, characterized in that: The winding assembly includes a winding shaft, the front and rear ends of which are rotatably connected to the two support plates via bearings respectively, a roller is fixedly connected to the outer surface of the winding shaft, a plurality of pulling cones are fixedly connected to the outer surface of the roller, and the front end of the winding shaft is connected to the power mechanism.

4. A dust-proof net recovery device for construction engineering as claimed in claim 3, characterized in that: The power mechanism adopts a motor, the motor is installed on the support plate, and the output shaft of the motor is connected to the winding shaft.

5. A dust-proof net recovery device for construction engineering as claimed in claim 3, characterized in that: The transmission assembly comprises a first pulley mounted on the winding shaft, a second pulley mounted on the winding assembly, and a belt mounted on the first pulley and the second pulley.

6. A dust-proof net recovery device for construction engineering as claimed in claim 5, characterized in that: The winding assembly includes a winding shaft, a screw and two top cylinder cones, the rear end of the winding shaft is screwed to the screw, the front part of the winding shaft is fixedly connected to one of the top cylinder cones, the rear end of the screw is fixedly connected to the other top cylinder cone, the front end of the winding shaft is rotatably connected to the first sliding plate through a bearing, a first horizontal long hole is provided at a position corresponding to the position of the first sliding plate on the front support plate, the first sliding plate is slidably arranged in the first long hole and can slide left and right in the first long hole, a first elastic element is provided between the left side wall of the first sliding plate and the left side wall of the first long hole, and the second pulley is installed on the winding shaft.

7. A dust-proof net recovery device for construction engineering as claimed in claim 6, characterized in that: The two top cylinder cones are symmetrically arranged front and back, and the tops of the two top cylinder cones are respectively connected to one end of a pressing plate made of a tough material for pressing the dustproof net.

8. A dust-proof net recovery device for construction engineering as claimed in claim 6, characterized in that: The cam is provided with a second elastic element, wherein the second elastic element is provided between the upper wall of the second long hole and the upper surface of the second sliding plate.

9. A dust-proof net recovery device for construction engineering as claimed in claim 3, characterized in that: It also includes a top support assembly, which is slidably installed on the two support plates. The top support assembly includes a lifting plate, and the front and rear corresponding parts of the two support plates are respectively provided with vertical third long holes. The two ends of the lifting plate are slidably installed in the two third long holes. A top support shaft is installed at the upper end of the lifting plate, and the lower end of the lifting plate is connected to the lifting part. The lifting part can move upward along the two third long holes driven by external power, so that the top support shaft supports the dustproof net upward, contacts with the pulling cone on the rolling assembly, and can rotate with the winding assembly.

10. A dust-proof net recovery device for construction engineering as claimed in claim 9, characterized in that: The lifting part includes two push-pull plates and a screw rod. The upper ends of the two push-pull plates are hinged to the left and right parts of the lower end of the lifting plate. The lower ends of the two push-pull plates are hinged to a hinge seat respectively. The two hinge seats are respectively provided with screw holes. The screw rod is screwed and inserted into the two screw holes. The screw rod is rotatably installed on the two support plates.