Large-space foundation pit air film ventilation device

Abstract

The invention provides a large-space foundation pit air film ventilation device and relates to the technical field of foundation pit tunnels, the large-space foundation pit air film ventilation device comprises a positioning ring, a splicing assembly is arranged on the inner wall of the positioning ring, the splicing assembly comprises four bent pipes which are evenly distributed and fixedly connected in the circumferential direction, and the inclined faces of the two ends of each bent pipe are in opposite states; an outer pipe is movably connected between every two adjacent bent pipes, inner pipes are movably connected to the two ends of the inner wall of each outer pipe, two fixing plates are symmetrically and evenly distributed and fixedly connected to the two ends of the inner wall of each outer pipe, and elastic telescopic rods are fixedly connected to the side faces of the fixing plates. The multi-layer ventilation structure is erected on the inner wall of the foundation pit and matched with the draught fan to conduct multi-layer transverse ventilation, one row of outer pipes are rotated to be spliced with the two adjacent layers of oppositely-distributed bent pipes, so that the multi-layer ventilation structure forms a spiral structure, the spiral structure is matched with the draught fan, and air outside the foundation pit can be extracted and guided into the bottom of the foundation pit; and therefore, air in the foundation pit can be quickly replaced.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit tunnels, and in particular to an air film ventilation device for a large-space foundation pit. Background Art

[0002] Ventilation of foundation pits is an indispensable part of the construction process. Due to the large depth of the foundation pit and the relatively closed space, as the construction progresses, a large amount of harmful gases, such as carbon monoxide and methane, may accumulate in the underground space, as well as dust generated during the construction process. These harmful gases and dust not only pose a threat to the health of construction workers, but may also cause safety accidents such as explosions.

[0003] During the ventilation operation of the foundation pit, it is usually necessary to use a fan and a pipe system to extract the air inside the foundation pit or introduce external air to achieve effective air replacement. Due to the vast space and diverse levels inside the foundation pit, the ventilation process often faces the problem of uneven air flow, which greatly weakens the ventilation effect. In addition, air replacement at the bottom of the foundation pit is particularly difficult, which not only aggravates the deterioration of air quality, but also makes the construction workers at the bottom of the foundation pit face a more severe working environment.

[0004] For example: The Chinese invention patent (application number: 202210797752.X) discloses a "ventilation device for a foundation pit tunnel and its use method". Its specification discloses: a foundation pit tunnel is a type of tunnel. When ventilating, the foundation pit tunnel is ventilated directly through the entrances and exits on both sides. The ventilation efficiency is low, resulting in the user being unable to ventilate quickly during use. The oxygen content inside the foundation pit tunnel is low, which will cause harm to people inside the foundation pit tunnel. The above patent can prove the defects of the prior art.

[0005] Therefore, we made improvements on this and proposed a large-space foundation pit air film ventilation device. Summary of the invention

[0006] The purpose of the present invention is to address the problems raised by the current background technology.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention provides a large-space foundation pit air film ventilation device to improve the above-mentioned problems.

[0008] The specific application is as follows:

[0009] A large space foundation pit air film ventilation device comprises a positioning ring, the inner wall of the positioning ring is provided with a splicing assembly, the splicing assembly comprises four curved pipes evenly distributed and fixedly connected in a circumference, and the inclined surfaces at both ends of the curved pipes are in opposite states, an outer pipe is movably connected between two adjacent curved pipes, both ends of the inner wall of the outer pipe are movably connected to the inner pipe, both ends of the inner wall of the outer pipe are symmetrically and evenly distributed and fixedly connected with two fixed plates, the sides of the fixed plates are fixedly connected with elastic telescopic rods, and the rear end of the outer pipe is provided with an extension assembly.

[0010] As a preferred technical solution of the present application, the other end of the elastic telescopic rod is fixedly connected to a positioning plate, and the other side of the positioning plate is fixedly mounted on the inner wall of the inner tube.

[0011] As a preferred technical solution of the present application, windows are provided on opposite sides of both ends of the curved pipe, and elastic baffles are provided on the inner walls of the windows. The upper and lower surfaces of both ends of the curved pipe are fixedly connected with inclined baffles, and the two inclined baffles are relatively distributed.

[0012] As a preferred technical solution of the present application, the extension component includes two slide grooves that are symmetrically and evenly distributed and opened on one side of the outer tube close to the positioning ring. A pulley is movably connected to the inner wall of the slide groove, and one end of the pulley passes through the slide groove and is fixedly installed on the outer wall of the inner tube. An elliptical plate is movably connected between two adjacent pulleys, and the surface of the elliptical plate close to the outer tube is symmetrically and evenly distributed and fixedly connected with rubber bumps, and a cleaning component is provided on the inner wall of the outer tube.

[0013] As a preferred technical solution of the present application, a rotating shaft is fixedly connected to the middle of the elliptical plate, and one end of the rotating shaft passes through the elliptical plate and is fixedly connected to a motor.

[0014] As a preferred technical solution of the present application, an arc-shaped plate is fixedly connected to one end of the motor away from the elliptical plate, and the arc-shaped plate is fixedly mounted on the inner wall of the positioning ring.

[0015] As a preferred technical solution of the present application, the elliptical plate is fixedly connected to a limiting ring frame on one side close to the positioning ring, the inner wall of the limiting ring frame is movably connected to a positioning cylinder, and the other end of the positioning cylinder is fixedly mounted on the side of the arc-shaped plate.

[0016] As a preferred technical solution of the present application, the cleaning assembly includes two arc-shaped frame plates symmetrically and evenly distributed and fixedly installed on the inner wall of the outer tube, two arc-shaped filter plates are symmetrically and evenly distributed and fixedly connected between the two arc-shaped frame plates, and scrapers are movably connected to the opposite surfaces of the two arc-shaped filter plates.

[0017] As a preferred technical solution of the present application, one end of the scraper away from the arc-shaped filter plate is fixedly connected to a filter plate, and a sleeve is fixedly connected between the two filter plates.

[0018] As a preferred technical solution of the present application, an extension shaft is fixedly connected to the inner wall of the sleeve, and the other end of the extension shaft passes through the outer tube and is fixedly installed at one end of the rotating shaft.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the scheme of this application:

[0021] 1. In order to solve the problem of uneven air flow in the ventilation process due to the wide space and diverse levels of the foundation pit in the prior art, which greatly weakens the ventilation effect, and the air replacement at the bottom of the foundation pit is particularly difficult, which not only aggravates the deterioration of air quality, but also makes the construction workers at the bottom of the foundation pit face a more severe working environment. The present application sets up a multi-layer ventilation structure on the inner wall of the foundation pit, cooperates with the fan to carry out multi-layer horizontal ventilation, and rotates one of the outer pipes of the row to splice with the relatively distributed elbows of the adjacent two layers, so that the multi-layer The ventilation structure forms a spiral structure, which cooperates with the fan to draw the air outside the foundation pit and introduce it into the bottom of the foundation pit, so as to quickly replace the air in the foundation pit. By rotating each layer of the ventilation structure to form four sets of pipes, which are connected to the pump body, the accumulated water inside the foundation pit can be extracted, so that the single layer can be circulated and ventilated. It can also be converted into a spiral shape to draw the air outside the foundation pit to the bottom of the foundation pit, so as to quickly and specifically ventilate the inside of the foundation pit. It can also be converted into four sets of pipes and cooperate with the pump body to extract the accumulated water from the foundation pit.

[0022] 2. The present application drives the elliptical plate to rotate by a motor, and the rubber protrusions on the elliptical surface contact the outer tube, driving the outer tube to rotate accordingly, and after contacting the curved tube, the rubber protrusions are compressed by resistance, and the elliptical plate rotates, pushing the pulleys on both sides of the elliptical plate to move along the slide groove, and pushing the inner tube out of the outer tube, contacting the inside of the curved tube, and achieving splicing, so that the ventilation structure can be changed in a forward and reverse manner, and the efficiency of the foundation pit ventilation can be improved;

[0023] 3. The present invention rotates the outer tube, and the rotating shaft drives the extension shaft to rotate, so that the scraper connected to the filter plate scrapes and cleans the surface of the arc filter plate, so that the filter screen can be cleaned during the switching and adjustment process of the pipeline structure, thereby improving the quality of ventilation;

[0024] 4. During the outer tube adjustment process, the motor is started to drive the elliptical plate to rotate, and the rubber protrusions on the elliptical surface contact the outer tube, driving the outer tube to rotate accordingly, thereby serving as an adjustment structure. During the filter plate cleaning process, the motor rotates to drive the extension shaft connected to the rotating shaft to rotate accordingly, so that the outer wall of the sleeve is cleaned on the surface of the arc filter plate by the scraper connected to the filter plate, thereby serving as a cleaning structure, so that it can flexibly switch between the adjustment structure and the cleaning structure, thereby improving its ventilation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The overall structural diagram of the large-space foundation pit air film ventilation device provided in this application;

[0026] Figure 2 Schematic diagram of the local structure of the large space foundation pit air film ventilation device provided in this application Figure 1 ;

[0027] Figure 3 Schematic diagram of the local structure of the large space foundation pit air film ventilation device provided in this application Figure 2 ;

[0028] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0029] Figure 5 Schematic diagram of the local structure of the large space foundation pit air film ventilation device provided in this application Figure 3 ;

[0030] Figure 6 Schematic diagram of the local structure of the large space foundation pit air film ventilation device provided in this application Figure 4 ;

[0031] Figure 7 Schematic diagram of the local structure of the large space foundation pit air film ventilation device provided in this application Figure 5 .

[0032] Indicated in the figure:

[0033] 1. Positioning ring;

[0034] 2. Splicing assembly; 201. Bend pipe; 202. Oblique baffle; 203. Elastic baffle; 204. Inner pipe; 205. Outer pipe; 206. Elastic telescopic rod; 207. Positioning plate; 208. Fixing plate;

[0035] 3. Extension assembly; 301. Arc plate; 302. Positioning cylinder; 303. Elliptical plate; 304. Pulley; 305. Limiting ring frame; 306. Slide; 307. Rotating shaft; 308. Motor; 309. Rubber bump;

[0036] 4. Cleaning assembly; 401. Arc frame plate; 402. Filter plate; 403. Arc filter plate; 404. Sleeve; 405. Scraper; 406. Extension shaft. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] As described in the background technology, due to the vast space and diverse levels inside the foundation pit, the ventilation process often faces the problem of uneven air flow, which greatly weakens the ventilation effect, and air replacement at the bottom of the foundation pit is particularly difficult, which not only aggravates the deterioration of air quality, but also makes the construction workers at the bottom of the foundation pit face a more severe working environment.

[0039] In order to solve this technical problem, the present invention provides a large-space foundation pit air film ventilation device, which is applied to the technical field of foundation pit tunnels.

[0040] Specifically, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 6The large space foundation pit air film ventilation device specifically includes a positioning ring 1, the inner wall of the positioning ring 1 is provided with a splicing component 2, the splicing component 2 includes four curved pipes 201 that are evenly distributed and fixedly connected in a circumference, and the inclined surfaces at both ends of the curved pipes 201 are in opposite states, an outer pipe 205 is movably connected between two adjacent curved pipes 201, both ends of the inner wall of the outer pipe 205 are movably connected with the inner pipe 204, both ends of the inner wall of the outer pipe 205 are symmetrically and evenly distributed and fixedly connected with two fixed plates 208, the side of the fixed plate 208 is fixedly connected with an elastic telescopic rod 206, and the rear end of the outer pipe 205 is provided with an extension component 3, and the elastic telescopic rod 206 The other end is fixedly connected with a positioning plate 207, and the other side of the positioning plate 207 is fixedly installed on the inner wall of the inner tube 204. Windows are provided at opposite sides of both ends of the elbow 201, and elastic baffles 203 are provided on the inner wall of the windows. The upper and lower surfaces of both ends of the elbow 201 are fixedly connected with inclined baffles 202, and the two inclined baffles 202 are relatively distributed. In the lateral distribution process, the outer tubes 205 at the same level are horizontally distributed, and the inclined surfaces of the outer tubes 205 and the inclined surfaces of the elbows 201 are spliced ​​with each other, and the inner tube 204 extends out of the outer tube 205 and enters the elbow 201 for splicing. After starting the fan, The air at this depth of the foundation pit circulates to increase its lateral air flow speed to reduce the temperature inside the foundation pit. During the ventilation process, the outer tube 205 on the same side of the multi-layer structure rotates and tilts. When the two ends of the outer tube 205 respectively contact one end of the elbow 201 distributed at the upper and lower ends and hit the inclined baffle 202 connected to the elbow 201, due to the limitation of its rotation angle, the inner tube 204 on the inner wall of the outer tube 205 extends out and enters the window in the elbow 201, pushing the elastic baffle 203 to contact the inside of the elbow 201. At this time, the multi-layer ventilation structure The structure is spliced ​​together to form a spiral state. After the fan is started, the air outside the foundation pit is drawn along the spiral structure and enters the bottom of the foundation pit to replace the air at the bottom of the foundation pit. When there is water at the bottom of the foundation pit, the four outer tubes 205 in each layer rotate and collide with the inclined baffles 202 in the two adjacent layers of curved pipes 201 to stop rotating. At this time, the inner tube 204 of the outer tube 205 stretches and contacts the window in the curved pipe 201, so as to splice and form four groups of water pumping pipes, and connect the pump body at the top to extract the water at the bottom of the foundation pit.

[0041] The large-space foundation pit air film ventilation device provided by the present invention sets up a multi-layer ventilation structure on the inner wall of the foundation pit, which cooperates with the fan to perform multi-layer horizontal ventilation and air exchange, and rotates one row of outer tubes 205 to splice with the relatively distributed curved tubes 201 of the adjacent two layers, so that the multi-layer ventilation structure forms a spiral structure, which can be used in cooperation with the fan to draw the air outside the foundation pit into the bottom of the foundation pit, so as to quickly replace the air in the foundation pit, and rotate each layer of the ventilation structure to form four groups of pipes. After connecting with the pump body, the accumulated water inside the foundation pit can be extracted, so that the single layer can be circulated and ventilated. It can also be converted into a spiral shape to draw the air outside the foundation pit to the bottom of the foundation pit, so as to perform rapid and targeted ventilation and air exchange operations inside the foundation pit. It can also be converted into four groups of pipes to cooperate with the pump body to extract the accumulated water for the foundation pit.

[0042] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] Example 1, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7A large space foundation pit air film ventilation device, the extension component 3 includes two slide grooves 306 symmetrically and evenly distributed and opened on the side of the outer tube 205 close to the positioning ring 1, the inner wall of the slide groove 306 is movably connected with a pulley 304, and one end of the pulley 304 passes through the slide groove 306 and is fixedly installed on the outer wall of the inner tube 204, an elliptical plate 303 is movably connected between two adjacent pulleys 304, and the surface of the elliptical plate 303 close to the outer tube 205 is symmetrically and evenly distributed and fixedly connected with rubber bumps 309, and the inner wall of the outer tube 205 is provided with a cleaning component 4, and its motor 308 drives the elliptical plate 303 with the cooperation of the rotating shaft 307. The outer tube 205 rotates, and after the rubber protrusion 309 contacts the edge of the outer tube 205, the outer tube 205 is driven to rotate accordingly. After the two ends of the outer tube 205 hit the curved tube 201, they are subjected to resistance, and the rubber protrusion 309 is squeezed and contracted. Then the elliptical plate 303 pushes the pulley 304 on the outer wall of the outer tube 205, and the pulley 304 moves in the slide groove 306, and pushes the inner tube 204 connected thereto to extend out of the outer tube 205 and splice with the curved tube 201. When the farthest points on the surface of the elliptical plate 303 are tangent to the pulley 304, the motor 308 stops, thereby splicing them.

[0046] The elliptical plate 303 is driven to rotate by the motor 308, and the rubber protrusion 309 on the elliptical surface contacts the outer tube 205, driving the outer tube 205 to rotate accordingly, and after contacting the curved pipe 201, the rubber protrusion 309 encounters resistance, and the elliptical plate 303 rotates, pushing the pulleys 304 on both sides of the elliptical plate 303 to move along the slide groove 306, and pushing the inner tube 204 out of the outer tube 205, contacting the inside of the curved pipe 201 to achieve splicing, so that the ventilation structure can be changed in a forward and reverse manner, thereby improving the efficiency of the foundation pit ventilation.

[0047] Further, such as Figure 7 As shown, a rotating shaft 307 is fixedly connected to the middle of the elliptical plate 303, and one end of the rotating shaft 307 passes through the elliptical plate 303 and is fixedly connected to a motor 308. By starting the motor 308, the rotating shaft 307 drives the elliptical plate 303 to rotate, thereby changing the angle of the outer tube 205 so that it can be spliced ​​with the bent tubes 201 of different layers.

[0048] Further, such as Figure 7 As shown, the end of the motor 308 away from the elliptical plate 303 is fixedly connected to the arc plate 301, and the arc plate 301 is fixedly installed on the inner wall of the positioning ring 1. The motor 308 is fixed on the positioning ring 1 through the arc plate 301, thereby increasing the stability of the motor 308 during operation.

[0049] Further, such as Figure 2 and Figure 6As shown, the elliptical plate 303 is fixedly connected to a limiting ring frame 305 on one side close to the positioning ring 1, and a positioning cylinder 302 is movably connected to the inner wall of the limiting ring frame 305. The other end of the positioning cylinder 302 is fixedly installed on the side of the arc-shaped plate 301. The limiting ring frame 305 connected to the elliptical plate 303 is connected to the positioning cylinder 302 connected to the arc-shaped plate 301, so that the stability of the elliptical plate 303 is increased during the rotation driven by the motor 308.

[0050] Example 2 further optimizes the large space foundation pit air film ventilation device provided in Example 1. Specifically, Figure 1 , Figure 3 and Figure 4 As shown, the cleaning assembly 4 includes two arc-shaped frame plates 401 symmetrically and evenly distributed and fixedly installed on the inner wall of the outer tube 205, and two arc-shaped filter plates 403 are symmetrically and evenly distributed and fixedly connected between the two arc-shaped frame plates 401. The opposite surfaces of the two arc-shaped filter plates 403 are movably connected with scrapers 405, and the extension shaft 406 connected to one end of the rotating shaft 307 rotates accordingly, and the sleeve on the outer wall of the extension shaft 406 drives the filter plate 402 to rotate accordingly, and the scraper 405 at one end of the filter plate 402 scrapes the arc-shaped filter plate 403, thereby scraping and cleaning the arc-shaped filter plate 403.

[0051] By rotating the outer tube 205, the rotating shaft 307 drives the extension shaft 406 to rotate, so that the scraper 405 connected to the filter plate 402 scrapes and cleans the surface of the arc filter plate 403, so that the filter screen can be cleaned during the switching and adjustment process of the pipeline structure, thereby improving the quality of ventilation.

[0052] Further, such as Figure 3 and Figure 4 As shown, the scraper 405 is fixedly connected to a filter plate 402 at one end away from the arc filter plate 403, and a sleeve 404 is fixedly connected between the two filter plates 402. Through the cooperation between the filter plate 402 and the two layers of arc filter plates 403, the air flowing through the outer tube 205 can be filtered three times, thereby improving the air quality.

[0053] Further, such as Figure 3 and Figure 4 As shown, an extension shaft 406 is fixedly connected to the inner wall of the sleeve 404, and the other end of the extension shaft 406 passes through the outer tube 205 and is fixedly installed at one end of the rotating shaft 307. The sleeve 404 connected to the outer wall of the extension shaft 406 is connected to the filter plate 402, so that it can perform cleaning operations on the arc filter plate 403.

[0054] The use process of the large space foundation pit air film ventilation device provided by the present invention is as follows:

[0055] Working principle: The staff installs several sets of ventilation structures on the inner wall of the foundation pit in a vertical distribution, and installs a fan structure in the elbow 201 for ventilation operation;

[0056] Transverse ventilation: Start the motor 308 to drive the elliptical plate 303 to rotate in the opposite direction. After rotating a certain angle, the rubber protrusion 309 on the surface of the elliptical plate 303 contacts the edge of the outer tube 205, and drives the outer tube 205 to rotate accordingly. When the inclined surfaces at both ends of the outer tube 205 contact the inclined surfaces of two adjacent curved tubes 201 on the same layer, the outer tube 205 stops rotating. The outer tube 205 is subjected to resistance. The elliptical plate 303 continues to rotate driven by the rotating shaft 307. The rubber protrusion 309 is compressed, and the elliptical plate 303 pushes the pulley 304 to make the inner tube 204 extend out of the outer tube 205, and push the elastic baffle 203 in the curved tube 201 away from the bottom of the curved tube 201, and does not cover the end face of the inner tube 204, so that each layer is spliced ​​to form a ring structure. Start the fan, and the fan draws air to circulate between the connected pipes, so as to circulate the air in this layer.

[0057] Spiral ventilation: Start the motor 308 in the same row to drive the elliptical plate 303 to rotate in the forward direction. After rotating a certain angle, the rubber protrusion 309 on the surface of the elliptical plate 303 contacts the edge of the outer tube 205, and drives the outer tube 205 to rotate. When the inclined surfaces at both ends of the outer tube 205 contact the two relatively distributed curved tubes 201 in the adjacent two layers, and contact the inclined baffle 202 on the surface of the curved tube 201, the outer tube 205 is subjected to resistance, and the elliptical plate 303 continues to rotate under the drive of the rotating shaft 307. The rubber protrusion 309 is compressed, and the elliptical plate 303 pushes the pulley 304 to make the inner tube 204 extend out of the outer tube 205, enter the curved tube 201, and push the elastic baffle 203 to contact the inner wall of the curved tube 201. The ventilation structure in the foundation pit forms a spiral structure, and the fan is started. The fan draws air from the top of the foundation pit along the spiral structure pipeline and introduces it into the bottom of the foundation pit, so as to quickly ventilate the bottom of the foundation pit;

[0058] Drainage: Start all motors 308 to drive the elliptical plate 303 to rotate in the forward direction. After rotating to a certain angle, the rubber protrusion 309 on the surface of the elliptical plate 303 contacts the edge of the outer tube 205, and drives the outer tube 205 to rotate accordingly. When the inclined surfaces at both ends of the outer tube 205 contact the two relatively distributed curved tubes 201 in the adjacent two layers, and contact the inclined baffle 202 on the surface of the curved tube 201, the outer tube 205 is subjected to resistance, and the elliptical plate 303 continues to rotate under the drive of the rotating shaft 307. The rubber protrusion 309 is compressed, and the elliptical plate 303 pushes the pulley 304 to make the inner tube 204 extend out of the outer tube 205, enter the curved tube 201, and push the elastic baffle 203 to contact the inner wall of the curved tube 201. At this time, the ventilation duct inside the foundation pit forms four groups of curved pipes, and the pump body is connected to the upper end thereof. When the pump body is started, the accumulated water at the bottom of the foundation pit is extracted.

[0059] Filtration: The air passes through the outer tube 205 and is filtered twice by the arc filter plate 403 between the two arc frame plates 401. A filter plate 402 is provided between the two arc filter plates 403 to cooperate with the filter plate 402 to achieve three filtration treatments on the air.

[0060] Cleaning: When the motor 308 drives the rotating shaft 307 to rotate, the extension shaft 406 connected to one end of the rotating shaft 307 rotates accordingly, and the sleeve on the outer wall of the extension shaft 406 drives the filter plate 402 to rotate accordingly, and the scraper 405 at one end of the filter plate 402 scrapes the arc filter plate 403, and the surface of the arc filter plate 403 is cleaned in the process of changing the angle of the outer tube 205.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A large space foundation pit air film ventilation device, characterized in that: The invention comprises a positioning ring (1), wherein the inner wall of the positioning ring (1) is provided with a splicing assembly (2), wherein the splicing assembly (2) comprises four curved pipes (201) evenly distributed and fixedly connected in a circumferential manner, and the inclined surfaces at both ends of the curved pipes (201) are in opposite states, an outer pipe (205) is movably connected between two adjacent curved pipes (201), both ends of the inner wall of the outer pipe (205) are movably connected to an inner pipe (204), both ends of the inner wall of the outer pipe (205) are symmetrically evenly distributed and fixedly connected to two fixing plates (208), the side of the fixing plate (208) is fixedly connected to an elastic telescopic rod (206), and an extension assembly (3) is provided at the rear end of the outer pipe (205).

2. A large space foundation pit air film ventilation device according to claim 1, characterized in that: The other end of the elastic telescopic rod (206) is fixedly connected to a positioning plate (207), and the other side of the positioning plate (207) is fixedly mounted on the inner wall of the inner tube (204).

3. The large space foundation pit air film ventilation device according to claim 1 is characterized in that: Windows are provided at opposite surfaces at both ends of the curved pipe (201), and elastic baffles (203) are provided on the inner walls of the windows. Inclined baffles (202) are fixedly connected to the upper and lower surfaces of both ends of the curved pipe (201), and the two inclined baffles (202) are relatively distributed.

4. The large space foundation pit air film ventilation device according to claim 1 is characterized in that: The extension component (3) comprises two slide grooves (306) symmetrically and evenly distributed and opened on a side of the outer tube (205) close to the positioning ring (1); a pulley (304) is movably connected to the inner wall of the slide groove (306); one end of the pulley (304) passes through the slide groove (306) and is fixedly installed on the outer wall of the inner tube (204); an elliptical plate (303) is movably connected between two adjacent pulleys (304); a surface of the elliptical plate (303) close to the outer tube (205) is symmetrically and evenly distributed and fixedly connected with rubber protrusions (309); and a cleaning component (4) is provided on the inner wall of the outer tube (205).

5. The large space foundation pit air film ventilation device according to claim 4 is characterized in that: A rotating shaft (307) is fixedly connected to the middle of the elliptical plate (303), and one end of the rotating shaft (307) passes through the elliptical plate (303) and is fixedly connected to a motor (308).

6. The large space foundation pit air film ventilation device according to claim 5 is characterized in that: An end of the motor (308) away from the elliptical plate (303) is fixedly connected to an arc-shaped plate (301), and the arc-shaped plate (301) is fixedly mounted on the inner wall of the positioning ring (1).

7. The large space foundation pit air film ventilation device according to claim 4 is characterized in that: The elliptical plate (303) is fixedly connected to a limiting ring frame (305) on one side close to the positioning ring (1); the inner wall of the limiting ring frame (305) is movably connected to a positioning cylinder (302); the other end of the positioning cylinder (302) is fixedly mounted on the side of the arc-shaped plate (301).

8. The large space foundation pit air film ventilation device according to claim 4 is characterized in that: The cleaning assembly (4) comprises two arc-shaped frame plates (401) symmetrically and evenly distributed and fixedly mounted on the inner wall of the outer tube (205); two arc-shaped filter plates (403) are symmetrically and evenly distributed and fixedly connected between the two arc-shaped frame plates (401); and the opposite surfaces of the two arc-shaped filter plates (403) are movably connected with scrapers (405).

9. The large space foundation pit air film ventilation device according to claim 8, characterized in that: One end of the scraper (405) away from the arc-shaped filter plate (403) is fixedly connected to a filter plate (402), and a sleeve (404) is fixedly connected between the two filter plates (402).

10. The large space foundation pit air film ventilation device according to claim 9, characterized in that: An extension shaft (406) is fixedly connected to the inner wall of the sleeve (404), and the other end of the extension shaft (406) passes through the outer tube (205) and is fixedly mounted on one end of the rotating shaft (307).

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