Efficient air filtering device for foundation pit air film

Abstract

The invention relates to the technical field of air filtering, in particular to an efficient air filtering device for a foundation pit air film, which comprises an air film, an air guide seat is fixedly connected to one side of the air film in a penetrating manner, an exhaust fan is fixedly connected to the inner end of the air guide seat, and a cyclone filter is fixedly connected to the outer end of the air guide seat. The output end of the cyclone filter is fixedly connected with the discharge pipe, the bottom end of the cyclone filter is fixedly connected with the fixed seat, the movable ring is internally and rotatably connected with the pit digging pipe, the inner wall of the bottom end of the pit digging pipe is fixedly connected with the annular air bag, and the interior of the pit digging pipe is slidably and cooperatively provided with the bulldozing plate. According to the device, pit digging can be achieved, dust generated during foundation pit construction in an air film filtered by the cyclone filter can be conveniently buried, dust diffusion in air can be effectively avoided, secondary pollution possibly caused by dust is reduced, pollution to the surrounding environment is reduced, and the construction environment and air quality can be improved.

Description

Technical Field

[0001] This invention relates to the field of air filtration technology, and in particular to a high-efficiency air filtration device for foundation pit air membrane. Background Technology

[0002] Air-supported membrane structures are a common type of structure used for foundation pit protection in construction engineering, playing a crucial role, especially in deep foundation pit construction. They typically consist of an air-supported membrane and a supporting structure, effectively preventing soil erosion within the foundation pit, reducing the impact of the external environment, controlling weather conditions, and ensuring worker safety. During foundation pit construction, especially during the removal and excavation of soil layers, a large amount of dust is generated, severely impacting air quality at the construction site and adversely affecting worker health and the surrounding environment. Therefore, environmental protection measures are particularly important in foundation pit construction.

[0003] To address dust pollution during construction, the introduction of high-efficiency air filtration systems has become an effective environmental engineering measure. These systems, through the use of high-efficiency air filters, effectively remove dust, fine particulate matter (PM2.5), and harmful gases from the air, maintaining a clean construction environment and safe air quality. This not only reduces harm to workers' health but also minimizes pollution to the surrounding environment during construction.

[0004] The prior art publication CN119633510A provides a high-efficiency air filtration device for foundation pit air membranes. The filter arch and air supply components are both modularly designed, and can be increased or decreased in quantity and assembled as needed. This meets the usage requirements of foundation pit air membranes with different working conditions and capacities, improves the versatility and ease of use of the high-efficiency air filtration device, and has stronger adaptability to complex environments compared with existing air filtration equipment with constant filtration capacity. It effectively avoids waste caused by excessive filtration capacity and the problem of being unable to use the device when the environment changes.

[0005] Existing technologies, when in use, directly discharge the dust cleaned by the filter arch into the outside through exhaust equipment, which is not convenient for burying the dust. This may lead to air pollution, especially in construction environments with poor air quality or a lot of dust. This practice may exacerbate the pollution of the surrounding environment and affect the health of nearby residents and workers.

[0006] In summary, the existing technology lacks a technique for automatically burying the filtered dust from the high-efficiency air filtration device used for foundation pit air membranes. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the prior art by proposing a high-efficiency air filtration device for foundation pit air membrane.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a high-efficiency air filtration device for foundation pit air membrane, comprising an air membrane, an air guide seat fixedly connected through one side of the air membrane, an exhaust fan fixedly connected to the inner end of the air guide seat, a cyclone filter fixedly connected to the outer end of the air guide seat, an exhaust pipe fixedly connected to the output end of the cyclone filter, a fixed base fixedly connected to the bottom end of the cyclone filter, a rotating frame rotatably connected to the fixed base, a dust guide pipe fixedly connected to one end of the rotating frame, a movable ring fixedly connected to the other end of the rotating frame, a digging pipe rotatably connected inside the movable ring, an annular airbag fixedly connected to the inner wall of the bottom end of the digging pipe, and a bulldozer plate slidably fitted inside the digging pipe.

[0009] Preferably, a valve core is rotatably connected to the inner wall of the discharge pipe, the valve stem of the valve core extends through the inner wall of the discharge pipe to the outside and is fixedly connected to a universal joint, a fixing block is rotatably connected to the universal joint, the fixing block is fixedly connected to the outer wall of the discharge pipe, and an adjusting wheel is fixedly connected to the other end of the universal joint.

[0010] Preferably, a motor is fixedly connected to the bottom end of the rotating frame, and the motor is fixedly connected to the fixed base.

[0011] Preferably, the top end of the dust guide pipe is slidably in contact with the bottom end of the discharge pipe, an arc-shaped rack is fixedly connected to one side of the top end of the dust guide pipe, the arc-shaped rack is meshed with the adjusting wheel for transmission, a tapered tube is slidably fitted to the inner wall of the bottom end of the dust guide pipe, a plurality of springs are fixedly connected to the tapered tube, and the other end of the springs is fixedly connected to the inner wall of the dust guide pipe.

[0012] Preferably, an electric push rod is fixedly connected to one end of the moving ring, and the electric push rod is fixedly connected to the rotating frame through it. The bottom end of the moving ring has a ring structure with multiple protrusions fixedly connected to it.

[0013] Preferably, an annular rack is fixedly connected to the outer wall of the upper end of the excavation pipe, a second motor is fixedly connected to the movable ring, a transmission wheel is fixedly connected to the output end of the second motor, the transmission wheel meshes with the annular rack for transmission, a soil sampling port is provided through the fixed seat, the outer wall of the excavation pipe is slidably fitted with the inner wall of the soil sampling port, a limit ring is fixedly connected to the outer wall of the excavation pipe, and the limit ring is rotatably connected to the inner wall of the movable ring.

[0014] Preferably, an air inlet pipe is fixedly connected to one side of the annular airbag, and an inflation pipe is fixedly connected to the other end of the air inlet pipe. A contact rod is slidably fitted through the inner wall of the top end of the inflation pipe, and the outer end of the contact rod is slidably in contact with the protrusion.

[0015] Preferably, a piston is fixedly connected to one end of the contact rod inside the inflation tube, a tension spring is fixedly connected to the piston, the other end of the tension spring is fixedly connected to the inner wall of the inflation tube, and an exhaust pipe is fixedly connected to the other side of the annular airbag, with the top end of the exhaust pipe fixedly connected to the inner wall of the upper end of the digging pipe.

[0016] Preferably, a hydraulic rod is fixedly connected to the bulldozer plate, and the other end of the hydraulic rod is fixedly connected to the excavation pipe.

[0017] Preferably, a sealing sleeve is fixedly connected to one side of the top of the bulldozer blade, and the sealing sleeve is slidably fitted with the top of the exhaust pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a digging pipe that can be inserted into the soil around the foundation pit, and by rotating it, air can be inflated into the annular airbag on the inner wall of the bottom of the digging pipe, which can trap the soil inside the digging pipe. After the digging pipe moves up, it can dig a pit, which can bury the dust generated during the foundation pit construction within the air film filtered by the cyclone filter. This can effectively prevent the spread of dust in the air, reduce the secondary pollution that dust may cause, and thus reduce the pollution to the surrounding environment. Especially in urban construction and sensitive areas, it helps to improve the construction environment and air quality. 2. By installing a dust guide pipe, after the burial pit is dug, the position between the excavation pipe and the dust guide pipe is switched, allowing the dust guide pipe to move below the discharge pipe at the bottom of the cyclone filter. At this time, the dust guide pipe will automatically open and close the valve core inside the discharge pipe. Through the dust guide pipe and the conical pipe, the dust in the discharge pipe can fall accurately into the burial pit, avoiding the risk of dust overflowing due to wind, thus maintaining the cleanliness of the construction site. The automatic opening and closing of the dust guide pipe and valve core improves the system's intelligence level. During construction, dust emission treatment can be automated, reducing manual operation, improving the overall management efficiency of the construction site, and reducing the interference of human factors on dust treatment. 3. By installing a bulldozer inside the excavation pipe, the soil inside the excavation pipe can be pushed out, and the air vent on the annular airbag can be opened and closed automatically, facilitating the inflation and deflation of the annular airbag. At the same time, the bulldozer, which moves down, can compact the soil when it is covered with soil, reduce soil voids, increase soil density, ensure the stability of the soil layer around the foundation pit, and avoid the impact of buried dust on the soil layer around the foundation pit. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a high-efficiency air filtration device for foundation pit air membrane according to the present invention; Figure 2This is a schematic diagram of the high-efficiency air filtration device for foundation pit air membranes used in conjunction with the air membrane according to the present invention; Figure 3 This is a partial cross-sectional schematic diagram of the discharge pipe structure of a high-efficiency air filtration device for foundation pit air membrane according to the present invention; Figure 4 This is a partial cross-sectional schematic diagram of the structure of the fixing seat and other components of the high-efficiency air filtration device for foundation pit air membrane according to the present invention; Figure 5 This is a cross-sectional schematic diagram of the dust guide pipe structure of a high-efficiency air filtration device for foundation pit air membrane according to the present invention; Figure 6 This is a schematic diagram of the moving ring structure of a high-efficiency air filtration device for foundation pit air membrane according to the present invention; Figure 7 This is a cross-sectional schematic diagram of the excavation pipe structure of a high-efficiency air filtration device for foundation pit air membrane according to the present invention; Figure 8 This is a cross-sectional schematic diagram of the annular airbag structure of a high-efficiency air filtration device for foundation pit air membrane according to the present invention; Figure 9 This is a schematic diagram of the bulldozer plate structure of a high-efficiency air filtration device for an air membrane foundation pit according to the present invention.

[0020] The diagram shows the following components: 1. Air film; 2. Air guide seat; 3. Exhaust fan; 4. Cyclone filter; 5. Discharge pipe; 6. Fixed base; 7. Rotating frame; 8. Dust guide pipe; 9. Moving ring; 10. Digging pipe; 11. Annular airbag; 12. Bulldozer blade; 501. Valve core; 502. Universal joint; 503. Adjusting wheel; 504. Fixed block; 701. Motor 1; 801. Arc rack; 802. Conical... Pipe; 803, Spring; 901, Electric actuator; 902, Protrusion block; 903, Motor II; 904, Transmission wheel; 1001, Ring rack; 1002, Limiting ring; 601, Soil intake port; 1101, Air inlet pipe; 1102, Air filling pipe; 1103, Contact rod; 1104, Piston; 1105, Tension spring; 1106, Exhaust pipe; 1201, Hydraulic rod; 1202, Sealing sleeve. Detailed Implementation

[0021] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0022] like Figures 1-9The high-efficiency air filtration device for foundation pit air membrane shown includes an air membrane 1. An air guide seat 2 is fixedly connected through one side of the air membrane 1. An exhaust fan 3 is fixedly connected to the inner end of the air guide seat 2. A cyclone filter 4 is fixedly connected to the outer end of the air guide seat 2. An exhaust pipe 5 is fixedly connected to the output end of the cyclone filter 4. A fixed base 6 is fixedly connected to the bottom end of the cyclone filter 4. A rotating frame 7 is rotatably connected to the fixed base 6. A dust guide pipe 8 is fixedly connected to one end of the rotating frame 7. A moving ring 9 is provided at the other end of the rotating frame 7. A digging pipe 10 is rotatably connected inside the moving ring 9. An annular airbag 11 is fixedly connected to the inner wall of the bottom end of the digging pipe 10. A bulldozer plate 12 is slidably fitted inside the digging pipe 10.

[0023] like Figure 3 As shown, a valve core 501 is rotatably connected to the inner wall of the discharge pipe 5. The valve stem of the valve core 501 extends through the inner wall of the discharge pipe 5 to the outside and is fixedly connected to a universal joint 502. A fixing block 504 is rotatably connected to the universal joint 502. The fixing block 504 is fixedly connected to the outer wall of the discharge pipe 5. An adjusting wheel 503 is fixedly connected to the other end of the universal joint 502.

[0024] like Figure 4 As shown, a motor 701 is fixedly connected to the bottom of the rotating frame 7, and the motor 701 is fixedly connected to the fixed base 6. The rotating frame 7 enables the switching of the positions of the dust guide pipe 8 and the digging pipe 10.

[0025] like Figure 4 , Figure 5 As shown, the top end of the dust guide pipe 8 is slidably in contact with the bottom end of the discharge pipe 5. An arc-shaped rack 801 is fixedly connected to one side of the top end of the dust guide pipe 8, and the arc-shaped rack 801 meshes with the adjusting wheel 503 for transmission. A tapered tube 802 is slidably fitted onto the inner wall of the bottom end of the dust guide pipe 8, and multiple springs 803 are fixedly connected to the tapered tube 802. The other end of each spring 803 is fixedly connected to the inner wall of the dust guide pipe 8. The tapered tube 802, in conjunction with the springs 803, extends the dust guide path, ensuring that dust falls fully into the landfill pit. The tapered tube 802 at the bottom end of the dust guide pipe 8 passes through the soil extraction port 601 under the action of the springs 803, extending into the landfill pit. Simultaneously, when the dust guide pipe 8 rotates, it drives the adjusting wheel 503 to rotate via the connected arc-shaped rack 801, allowing the adjusting wheel 503 to drive the valve core 501 connected to the universal joint 502 to rotate.

[0026] like Figure 6As shown, an electric actuator 901 is fixedly connected to one end of the moving ring 9. The electric actuator 901 is fixedly connected to the rotating frame 7 through the ring. The bottom end of the moving ring 9 has a ring structure with multiple protrusions 902 fixedly connected to it. The electric actuator 901 drives the connected moving ring 9 to move downward, which in turn drives the digging pipe 10 to move downward. The motor 903 drives the connected transmission wheel 904 to rotate, which in turn drives the digging pipe 10 connected to the ring rack 1001 to rotate.

[0027] like Figure 6 , Figure 7 As shown, a ring-shaped rack 1001 is fixedly connected to the outer wall of the upper end of the excavation pipe 10. A second motor 903 is fixedly connected to the moving ring 9. A transmission wheel 904 is fixedly connected to the output end of the second motor 903. The transmission wheel 904 meshes with the ring-shaped rack 1001 for transmission. A soil sampling port 601 is provided through the fixed base 6. The outer wall of the excavation pipe 10 and the inner wall of the soil sampling port 601 are slidably fitted. A limit ring 1002 is fixedly connected to the outer wall of the excavation pipe 10. The limit ring 1002 is rotatably connected to the inner wall of the moving ring 9. The second motor 903 can drive the excavation pipe 10 to rotate, which facilitates breaking the connection between the soil inside the excavation pipe 10 and other soil. A through hole is provided on the inner wall of the upper end of the excavation pipe 10.

[0028] By setting up a digging pipe 10, it can be inserted into the soil around the foundation pit. While rotating, it can inflate the annular airbag 11 on the inner wall of the bottom end of the digging pipe 10, which can trap the soil inside the digging pipe 10. After the digging pipe 10 moves upward, it can dig a pit, which can easily bury the dust generated during the foundation pit construction in the air film 1 filtered by the cyclone filter 4. This can effectively prevent the spread of dust in the air and reduce the secondary pollution that dust may cause, thereby reducing the pollution to the surrounding environment. Especially in urban construction and sensitive areas, it helps to improve the construction environment and air quality.

[0029] like Figure 8 As shown, an air inlet pipe 1101 is fixedly connected to one side of the annular airbag 11, and an inflation pipe 1102 is fixedly connected to the other end of the air inlet pipe 1101. A contact rod 1103 is slidably fitted through the inner wall of the top end of the inflation pipe 1102, and the outer end of the contact rod 1103 is in slidable contact with the protrusion 902. One-way valves are installed at both the input end of the inflation pipe 1102 and inside the air inlet pipe 1101. Under the action of the protrusion 902, the contact rod 1103, in conjunction with the tension spring 1105, drives the connected piston 1104 to reciprocate, thereby injecting air from the inflation pipe 1102 into the annular airbag 11 through the air inlet pipe 1101.

[0030] A piston 1104 is fixedly connected to one end of the contact rod 1103 inside the inflation tube 1102. A tension spring 1105 is fixedly connected to the piston 1104, and the other end of the tension spring 1105 is fixedly connected to the inner wall of the inflation tube 1102. An exhaust pipe 1106 is fixedly connected through the other side of the annular airbag 11, and the top end of the exhaust pipe 1106 is fixedly connected through the inner wall of the upper end of the digging pipe 10. The tension spring 1105 drives the piston 1104 to automatically reset. After the annular airbag 11 is inflated, it facilitates the interception of soil in the digging pipe 10, reducing soil loss.

[0031] like Figure 9 As shown, a hydraulic rod 1201 is fixedly connected to the bulldozer blade 12, and the other end of the hydraulic rod 1201 is fixedly connected to the excavation pipe 10.

[0032] A sealing sleeve 1202 is fixedly connected to one side of the top of the bulldozer blade 12, and the sealing sleeve 1202 is slidably fitted with the top of the exhaust pipe 1106. A rubber gasket is provided inside the sealing sleeve 1202 to improve the sealing performance at the opening of the exhaust pipe 1106. When the bulldozer blade 12 is moved downward by the hydraulic rod 1201, the sealing sleeve 1202 on the bulldozer blade 12 disengages from the top of the exhaust pipe 1106, allowing the air in the annular airbag 11 to be discharged through the exhaust pipe 1106.

[0033] Working principle: When foundation pit construction is required, the air membrane 1 is installed above the foundation pit to ensure the construction environment inside the foundation pit. At the same time, the corresponding number of cyclone filters 4 are selected as needed. The exhaust fan 3 can collect the dust generated during foundation pit construction in the air membrane 1 and inject it into the cyclone filter 4 through the air guide seat 2 for filtration. The filtered dust will fall into the discharge pipe 5 by its own weight. Then, the dust in the discharge pipe 5 needs to be treated regularly. First, use the electric push rod 901 to drive the connected moving ring 9 to move down, so that the moving ring 9 drives the digging pipe 10 to move down and insert it into the soil around the foundation pit. Then, the motor 903 drives the connected transmission wheel 904 to rotate, so that the transmission wheel 904 can drive the digging pipe 10 connected to the ring rack 1001 to rotate. At this time, under the action of the protrusion 902, the contact rod 1103, in conjunction with the tension spring 1105, can drive the connected piston 1104 to move back and forth, thereby injecting the air in the inflation pipe 1102 into the ring airbag 11 through the air inlet pipe 1101, causing it to inflate and inflate, thereby intercepting the soil in the digging pipe 10. Then, the electric actuator 901 drives the connected moving ring 9 to move upward, so that the digging pipe 10 removes the soil and digs out the burial pit. Then, the motor 701 drives the connected rotating frame 7 to rotate, so that the rotating frame 7 can switch the position of the dust guide pipe 8 and the digging pipe 10. At this time, the tapered tube 802 at the bottom of the dust guide pipe 8 will pass through the soil extraction port 601 under the action of the spring 803 and extend into the landfill pit. At the same time, when the dust guide pipe 8 is rotated, it will drive the adjusting wheel 503 to rotate through the connected arc rack 801, so that the adjusting wheel 503 can drive the valve core 501 connected to the universal joint 502 to rotate, thereby allowing the dust in the discharge pipe 5 to fall into the landfill pit through the dust guide pipe 8 and the tapered tube 802. Then the rotating frame 7 rotates in the opposite direction to continue switching the positions of the dust guide pipe 8 and the digging pipe 10. Then, the hydraulic rod 1201 drives the bulldozer plate 12 to move down. At this time, the sealing sleeve 1202 on the bulldozer plate 12 disengages from the top of the exhaust pipe 1106, so that the air in the annular airbag 11 will be discharged through the exhaust pipe 1106, thereby causing the annular airbag 11 to contract. Then, when the bulldozer plate 12 moves down, the soil can be pushed out smoothly. Then, the electric actuator 901 drives the moving ring 9 to move up and down, which will drive the digging pipe 10 and the bulldozer plate 12 to move up and down, compacting the covered soil and restoring the original appearance.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A high-efficiency air filter device for a foundation air film, comprising an air film (1), characterized in that: The gas film (1) one side through fixedly connected with the gas guide seat (2) is provided, gas guide seat (2) inner end fixedly connected with the exhaust fan (3) is provided, gas guide seat (2) outer end fixedly connected with the cyclone filter (4) is provided, cyclone filter (4) output end fixedly connected with the discharge pipe (5) is provided, cyclone filter (4) bottom fixedly connected with the fixed seat (6) is provided, fixed seat (6) upper rotary connection with the rotary frame (7) is provided, rotary frame (7) one end fixedly connected with the dust guide pipe (8) is provided, rotary frame (7) the other end is provided with mobile ring (9), mobile ring (9) inner rotary connection with the pit pipe (10) is provided, pit pipe (10) bottom inner wall fixedly connected with the annular air bag (11) is provided, pit pipe (10) inner slide fit with the bulldozer plate (12) is provided.

2. The high-efficiency air filter device for a foundation air film according to claim 1, characterized by: The discharge pipe (5) inner wall rotary connection with the valve core (501) is provided, the valve core (501) valve stem extends through the discharge pipe (5) inner wall to the outside and fixedly connected with the universal joint (502) is provided, the universal joint (502) upper rotary connection with the fixed block (504) is provided, the fixed block (504) and discharge pipe (5) outer wall fixedly connected with the setting, the universal joint (502) the other end fixedly connected with the adjusting wheel (503) is provided.

3. The high-efficiency air filter device for a foundation air film according to claim 1, characterized in that: The rotary frame (7) bottom fixedly connected with motor one (701) is provided, motor one (701) and fixed seat (6) fixedly connected with the setting.

4. The high-efficiency air filter device for foundation pit air film of claim 2, wherein: The dust guide pipe (8) top and discharge pipe (5) bottom end sliding contact setting, the dust guide pipe (8) top one side fixedly connected with the arc rack (801) is provided, the arc rack (801) and adjusting wheel (503) meshing transmission setting, the dust guide pipe (8) bottom inner wall slide fit with the conical tube (802) is provided, the conical tube (802) is fixedly connected with a plurality of springs (803) is provided, the spring (803) the other end and dust guide pipe (8) inner wall fixedly connected with the setting.

5. The high-efficiency air filter device for foundation pit air film of claim 1, wherein: The mobile ring (9) one end fixedly connected with the electric push rod (901) is provided, the electric push rod (901) and rotary frame (7) through fixedly connected with the setting, the mobile ring (9) bottom end annular structure fixedly connected with a plurality of convex blocks (902) is provided.

6. The high-efficiency air filter device for foundation pit air film of claim 1, wherein: The pit pipe (10) upper end outer wall fixedly connected with the annular rack (1001) is provided, the mobile ring (9) is fixedly connected with motor two (903) is provided, motor two (903) output end fixedly connected with the transmission wheel (904) is provided, the transmission wheel (904) and annular rack (1001) meshing transmission setting, the fixed seat (6) is provided with the earth taking mouth (601), the pit pipe (10) outer wall and earth taking mouth (601) inner wall slide fit setting, the pit pipe (10) outer wall fixedly connected with the limit ring (1002) is provided, the limit ring (1002) and mobile ring (9) inner wall rotary connection with the setting.

7. The high-efficiency air filter device for foundation pit air film of claim 5, wherein: One side of the annular air bag (11) is provided with an air inlet pipe (1101) through fixed connection, the other end of the air inlet pipe (1101) is provided with an inflation pipe (1102) through fixed connection, the inner wall of the top end of the inflation pipe (1102) is provided with a contact rod (1103) through sliding fit, the outer end of the contact rod (1103) is provided with a sliding contact with the convex block (902).

8. The high-efficiency air filter device for foundation pit air film according to claim 7, characterized in that: One end of the contact rod (1103) located in the inflation pipe (1102) is provided with a piston (1104) through fixed connection, the piston (1104) is provided with a tension spring (1105) through fixed connection, the other end of the tension spring (1105) is provided with fixed connection with the inner wall of the inflation pipe (1102), the other side of the annular air bag (11) is provided with an exhaust pipe (1106) through fixed connection, the top end of the exhaust pipe (1106) is provided with fixed connection with the inner wall of the upper end of the trench pipe (10).

9. The high-efficiency air filter device for foundation pit air film of claim 1, wherein: The bulldozing plate (12) is provided with a hydraulic rod (1201) through fixed connection, the other end of the hydraulic rod (1201) is provided with fixed connection with the trench pipe (10).

10. The high-efficiency air filter device for foundation pit air film of claim 8, wherein: The top end of the bulldozing plate (12) is provided with a sealing sleeve (1202) through fixed connection on one side, the sealing sleeve (1202) is provided with sliding fit with the top end of the exhaust pipe (1106).

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