A precipitation and dust removal device for subway station foundation pit

Abstract

The invention relates to a precipitation and dust removal device for a foundation pit of a subway station; a PP filter cartridge filters muddy water in a water collection well outside an outer wall into clean water, which then infiltrates into an inner cylinder; a water outlet is connected to an external dust removal device through a water channel so that the dust removal device can extract clean water from the inner cylinder of the PP filter cartridge, thereby realizing the application of precipitation and dust removal for the foundation pit; a stepping motor drives a dredging frame to rotate to dredge the surface of the outer wall of the PP filter cartridge, thereby preventing 24-hour dust removal water from causing excessive silt on the outer surface of the PP filter cartridge and reducing the filtering efficiency, thereby causing the dust removal water to be interrupted; the inner cavity of the bell mouth and the inner cylinder of the PP filter cartridge together constitute a clean water pool, and the dredging structure, the automatic leakage structure and the PP filter cartridge constitute a filtering device; when the pressure in the clean water pool is greater than the pressure outside the water outlet of the one-way valve, the one-way valve discharges the clean water in the clean water pool, thereby realizing automatic emptying of the water in the clean water pool, facilitating transportation, thereby realizing the reuse of precipitation for the foundation pit of the subway station.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation pit dewatering treatment, and in particular relates to a dewatering and dust removal device for a subway station foundation pit. Background Art

[0002] During the construction of urban rail transit foundation pits, the action of groundwater causes the soil particles in the rock and soil to move and flow locally, resulting in the instability, deformation and damage of the soil. If no measures are taken, it is very easy to cause sand flow, pipe bursts, erosion and other diseases, which pose a serious threat to the stability of the foundation pit and surrounding buildings. Therefore, special attention should be paid to strengthening the treatment of groundwater during foundation pit construction; and a large amount of dust pollution will be associated with the construction process. In recent years, with the development of the economy, environmental issues have attracted more and more attention. Solving the problem of dust pollution in urban construction is an extremely important construction link.

[0003] At present, for deep foundation pits with shallow groundwater levels, precipitation wells are set up in the foundation pits according to construction requirements. However, most construction units have a low recycling rate for the water in the precipitation wells in the foundation pits, and some even directly discharge the water into the sewage pipes without reuse. For the dust generated by construction, dust suppression treatment is required, and generally a separate water source is set up to supply water to the wind tube of the fog cannon. Due to the large amount of on-site construction, a large amount of water will be consumed during the construction process, resulting in a certain waste of water resources. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a precipitation and dust removal device for a subway station foundation pit in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A precipitation and dust removal device for a subway station foundation pit is constructed, comprising a dredging structure and an automatic leakage structure and a PP filter cartridge located in a water collection well; wherein the automatic leakage structure comprises: a one-way valve and a bell mouth, wherein the large mouth of the bell mouth is located above the small mouth, the water inlet of the one-way valve is fixedly connected to the small mouth of the bell mouth and the water outlet faces downward, and the bell mouth is arranged vertically;

[0007] The PP filter cartridge is located above the large opening of the bell mouth and is sealed with the large opening of the bell mouth. The PP filter cartridge filters the muddy water in the water collection well outside the outer wall into clean water and then infiltrates into the inner cylinder. A water outlet is provided in the inner cylinder of the PP filter cartridge. The water outlet is connected to an external dust removal device through a water channel so that the dust removal device can extract clean water from the inner cylinder of the PP filter cartridge.

[0008] The desilting structure comprises: a desilting frame and a stepping motor, the pp filter cartridge is located in the desilting frame, and the stepping motor drives the desilting frame to rotate to desilt the surface of the outer side wall of the pp filter cartridge;

[0009] The inner cavity of the bell mouth and the inner cylinder of the PP filter cartridge together constitute a clear water tank, the dredging structure, the automatic leakage structure and the PP filter cartridge constitute a filtering device, and when the pressure in the clear water tank is greater than the pressure outside the water outlet of the one-way valve, the one-way valve discharges the clear water in the clear water tank.

[0010] The precipitation and dust removal device for a subway station foundation pit of the present invention, wherein the filtering device further comprises: a supporting frame for supporting the PP filter cartridge;

[0011] The support frame includes a first circular ring, a second circular ring, a plurality of first circular rods and a circular disk. The support frame is located in the inner cylinder of the PP filter cylinder. The plurality of first circular rods are located between the first circular ring and the second circular ring and are perpendicular to the first circular ring and the second circular ring. The plurality of first circular rods are fixedly connected to the first circular ring and the second circular ring. The plurality of first circular rods are arranged at intervals and are closely attached to the inner cylinder wall of the PP filter cylinder.

[0012] The circular disk is located between the first circular ring and the second circular ring and is fixedly connected to the first circular rods.

[0013] The precipitation and dust removal device for a subway station foundation pit of the present invention is characterized in that the water outlet nozzle passes through the side wall of the bell mouth and is sealed with the bell mouth.

[0014] The precipitation and dust removal device for a subway station foundation pit of the present invention, wherein the dredging structure further comprises: a mounting box and a plurality of second round rods for fixing the mounting box;

[0015] The installation box is composed of a side plate and a bottom plate that surround the bottom plate at 360 degrees. The side plate is located above the bottom plate and is fixedly and sealedly connected to the bottom plate. The side plate and the bottom plate cooperate to form an installation cavity.

[0016] The installation box is located in the support frame and above the disc, a plurality of the second round rods pass through the disc and are fixedly connected to the side wall of the bell mouth, and ends of the plurality of the second round rods away from the bell mouth are detachably fixedly connected to the bottom plate;

[0017] The stepper motor is vertically arranged in the installation cavity, the installation seat of the stepper motor is fixedly connected to the bottom plate, and the driving end of the stepper motor faces upward and extends out of the installation cavity.

[0018] The precipitation and dust removal device for a subway station foundation pit of the present invention, wherein the filtering device further comprises a circular cover plate, the circular cover plate is located above the PP filter cartridge and is sealed with the top surface of the PP filter cartridge, and the circular cover plate is detachably fixedly connected to the side plate;

[0019] The bottom surface of the circular cover plate is also sealed with the top surface of the side plate, and the driving end of the stepper motor passes through the circular cover plate and is sealed with the circular cover plate.

[0020] The precipitation and dust removal device for subway station foundation pit described in the present invention, wherein the dredging frame includes: a circular turntable and a plurality of arc-shaped leaves, the plurality of arc-shaped leaves are arranged at intervals to surround the PP filter cartridge and are fixedly connected to the circular turntable, the center of the circular turntable is fixedly connected to the driving end of the stepper motor; the plurality of arc-shaped leaves are all inclined downward.

[0021] The precipitation and dust removal device for a subway station foundation pit of the present invention, wherein the filtering device further comprises a protective cover, wherein the protective cover covers the dredging frame and is provided with a plurality of through holes on the side wall facing the plurality of arc-shaped leaves;

[0022] A connecting ring is also fixedly connected to the bell mouth, the bell mouth is located inside the connecting ring and fixedly connected to the connecting ring, the pp filter cartridge is located above the connecting ring and the bottom surface is sealed with the connecting ring, the connecting ring is also located inside the protective cover and is detachably fixedly connected to the protective cover.

[0023] The precipitation and dust removal device for subway station foundation pit described in the present invention, wherein the filtering device also includes an arc ring, the arc ring is located below the connecting ring and fixedly connected to the connecting ring, and the one-way valve is located in the arc ring; the concave arc surface of the arc ring is away from the one-way valve; the connecting ring is provided with a plurality of grooves, and the grooves are opposite to the arc leaves.

[0024] The precipitation and dust removal device for a subway station foundation pit of the present invention, wherein the filtering device further comprises a first water level sensor, a second water level sensor, a first wire waterproof connector, a second wire waterproof connector, a third wire waterproof connector, and a fourth wire waterproof connector;

[0025] The first water level sensor is fixedly connected to the outer side wall of the side plate and is close to the circular cover plate, and the second water level sensor is fixedly connected to the bottom surface of the circular disk;

[0026] The first wire waterproof connector, the second wire waterproof connector and the third wire waterproof connector are all fixedly connected to the installation box, and the fourth wire waterproof connector is fixedly connected to the bell mouth;

[0027] The first wire waterproof connector and the second wire waterproof connector are one-to-one inserted through the wiring harnesses of the first water level sensor and the second water level sensor;

[0028] The third wire waterproof connector and the fourth wire waterproof connector are both used to pass a main cable, and the main cable is respectively connected to the stepper motor and the first water level sensor and the second water level sensor.

[0029] The precipitation and dust removal device for a subway station foundation pit described in the present invention, wherein the main cable and the water outlet nozzle both pass through the arc ring.

[0030] The beneficial effects of the present invention are as follows: the PP filter cartridge filters the muddy water in the water collection well outside the outer wall into clean water, which then penetrates into the inner cylinder; the water outlet is connected to the external dust removal device through a water channel so that the dust removal device can extract the clean water in the inner cylinder of the PP filter cartridge, thereby realizing the application of foundation pit dewatering and dust removal, and saving water resources; when the stepper motor drives the dredging frame to rotate, the surface of the outer wall of the PP filter cartridge is dredged to prevent the 24-hour dust removal water from causing excessive silt on the outer surface of the PP filter cartridge, thereby reducing the efficiency of filtration penetration and causing the dust removal water to be interrupted; the inner cavity of the bell mouth and the inner cylinder of the PP filter cartridge together constitute a clean water tank, and the dredging structure, the automatic leakage structure and the PP filter cartridge constitute a filtering device, and when the pressure in the clean water tank is greater than the pressure outside the water outlet of the one-way valve, the one-way valve discharges the clean water in the clean water tank, thereby realizing automatic emptying of the water in the clean water tank, which is convenient for transportation; thereby realizing the reuse of subway station foundation pit dewatering, with low energy consumption, and also greatly meeting the water demand for dust removal on the construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work:

[0032] Figure 1 It is a cross-sectional view of a precipitation and dust removal device for a subway station foundation pit according to a preferred embodiment of the present invention;

[0033] Figure 2 It is a three-dimensional diagram of a support frame of a precipitation and dust removal device for a subway station foundation pit according to a preferred embodiment of the present invention;

[0034] Figure 3 It is a three-dimensional diagram of a PP filter cartridge of a precipitation and dust removal device for a subway station foundation pit according to a preferred embodiment of the present invention;

[0035] Figure 4This is a front view of a precipitation and dust removal device for a subway station foundation pit according to a preferred embodiment of the present invention;

[0036] Figure 5 This is an example diagram of the use scenario of the precipitation and dust removal device for a subway station foundation pit according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0038] The precipitation and dust removal device for subway station foundation pit of the preferred embodiment of the present invention is as follows Figure 1 See also Figures 2 to 5 ; It includes a desilting structure and an automatic leakage structure located in the water collection well and a PP filter cartridge 110; The automatic leakage structure includes: a one-way valve 121 and a bell mouth 122, the large mouth of the bell mouth 122 is located above the small mouth, the water inlet of the one-way valve 121 is fixedly connected to the small mouth of the bell mouth 122 and the water outlet is downward, and the bell mouth 122 is vertically arranged; wherein the PP filter cartridge 110 is made of polypropylene;

[0039] The pp filter cartridge 110 is located above the large opening of the bell mouth 122 and is sealed with the large opening of the bell mouth 122. The pp filter cartridge 110 filters the muddy water in the water collection well outside the outer wall into clean water and then infiltrates into the inner cylinder. A water outlet 130 is provided in the inner cylinder of the pp filter cartridge 110. The water outlet 130 is connected to the external dust removal device through a water channel so that the dust removal device can extract the clean water in the inner cylinder of the pp filter cartridge 110.

[0040] The dredging structure includes: a dredging frame 140 and a stepper motor 150. The PP filter cartridge 110 is located in the dredging frame 140. When the stepper motor 150 drives the dredging frame 140 to rotate, the surface of the outer wall of the PP filter cartridge 110 is dredged, and the dredging is driven by the flow of water.

[0041] The inner cavity of the bell mouth 122 and the inner cylinder of the PP filter cartridge 110 together constitute a clean water tank 160, and the desilting structure and the automatic leakage structure and the PP filter cartridge 110 constitute the filter device 100. When the pressure in the clean water tank 160 is greater than the pressure outside the water outlet of the one-way valve 121, the one-way valve 121 discharges the clean water in the clean water tank 160. For example, when the filter device 100 is hoisted, the pressure in the clean water tank 160 is greater than the external medium pressure, and the one-way valve 121 is turned on to discharge the clean water in the clean water tank 160 to reduce the weight and facilitate manual handling;

[0042] The pp filter cartridge 110 filters the muddy water in the water collection well outside the outer wall into clean water and then infiltrates into the inner cylinder. The water outlet 130 is connected to the external dust removal device through a water channel so that the dust removal device can extract the clean water in the inner cylinder of the pp filter cartridge 110, thereby realizing the application of precipitation and dust removal for foundation pits and saving water resources. When the stepper motor 150 drives the dredging frame 140 to rotate, the surface of the outer wall of the pp filter cartridge 110 is dredged to prevent the 24-hour dust removal water from causing excessive silt on the outer surface of the pp filter cartridge 110, thereby reducing the efficiency of filtration and penetration, and causing The water supply for dust removal is interrupted; the inner cavity of the bell mouth 122 and the inner cylinder of the PP filter cartridge 110 together constitute a clean water tank 160, and the dredging structure, the automatic leakage structure and the PP filter cartridge 110 constitute a filtering device 100. When the pressure in the clean water tank 160 is greater than the pressure outside the water outlet of the one-way valve 121, the one-way valve 121 discharges the clean water in the clean water tank 160, thereby automatically emptying the water in the clean water tank 160 for easy transportation; thereby realizing the reuse of precipitation in the foundation pit of the subway station, with low energy consumption, and also greatly meeting the water demand for dust removal on the construction site.

[0043] like Figures 1 to 3 As shown, the filter device 100 further includes: a support frame 111 supporting the pp filter cartridge 110;

[0044] The support frame 111 includes a first circular ring 1111, a second circular ring 1112, a plurality of first circular rods 1113 and a circular disc 1114. The support frame 111 is located in the inner cylinder of the PP filter cylinder 110. The plurality of first circular rods 1113 are located between the first circular ring 1111 and the second circular ring 1112 and are perpendicular to the first circular ring 1111 and the second circular ring 1112. The plurality of first circular rods 1113 are fixedly connected to the first circular ring 1111 and the second circular ring 1112. The plurality of first circular rods 1113 are arranged at intervals and are closely attached to the inner cylinder wall of the PP filter cylinder 110.

[0045] The disc 1114 is located between the first ring 1111 and the second ring 1112 and is fixedly connected to the plurality of first round rods 1113; the structure is simple and can prevent the PP filter cartridge 110 from being squeezed and flattened due to a large pressure difference between the inside and the outside when entering deep water.

[0046] like Figure 1 and Figure 4 As shown, the water outlet 130 passes through the side wall of the bell mouth 122 and is sealed with the bell mouth 122; it is convenient to use.

[0047] like Figure 1 As shown, the dredging structure further includes: a mounting box 170 and a plurality of second round rods 171 for fixing the mounting box 170;

[0048] The installation box 170 is composed of a 360-degree surrounding side plate 1701 and a bottom plate 1702. The side plate 1701 is located above the bottom plate 1702 and is fixedly and sealedly connected to the bottom plate 1702. The side plate 1701 and the bottom plate 1702 cooperate to form an installation cavity 1703, which is convenient for installation.

[0049] The installation box 170 is located in the support frame 111 and above the disc 1114. The plurality of second round rods 171 pass through the disc 1114 and are fixedly connected to the side wall of the bell mouth 122. The ends of the plurality of second round rods 171 away from the bell mouth 122 are all detachably fixedly connected to the bottom plate 1702.

[0050] The stepper motor 150 is vertically arranged in the installation cavity 1703, the installation seat of the stepper motor 150 is fixedly connected to the bottom plate 1702, and the driving end of the stepper motor 150 faces upward and extends out of the installation cavity 1703; the structure is simple and easy to install.

[0051] like Figure 1 and Figure 3 As shown, the filter device 100 further includes a circular cover plate 180, which is located above the PP filter cartridge 110 and is sealed with the top surface of the PP filter cartridge 110, and the circular cover plate 180 is detachably fixedly connected to the side plate 1701;

[0052] The bottom surface of the circular cover plate 180 is also sealed with the top surface of the side plate 1701 using a rubber pad (not shown in the figure), etc. The driving end of the stepper motor 150 passes through the circular cover plate 180 and is sealed with the circular cover plate 180 using a water seal (not shown in the figure).

[0053] like Figure 1 and Figure 2 As shown, the dredging frame 140 includes: a circular rotating disk 141 and a plurality of arc-shaped leaves 142, wherein the plurality of arc-shaped leaves 142 are arranged at intervals to surround the PP filter cartridge and are fixedly connected to the circular rotating disk 141, and the center of the circular rotating disk 141 is fixedly connected to the driving end of the stepper motor 150; the plurality of arc-shaped leaves 142 are all inclined downward to discharge the sand; further, a brush can be installed on the arc-shaped leaves 142 to improve the dredging efficiency; the rotation resistance of the circular rotating disk is small; wherein, the cross-section of the arc-shaped leaves 142 is arc-shaped, and its concave arc surface is consistent with the rotation direction of the stepper motor 150.

[0054] like Figure 1 and Figure 4 As shown, the filter device 100 further includes a protective cover 190, which covers the dredging frame 140 and has a plurality of through holes 191 on the side wall facing the plurality of arc-shaped leaves 142 for water to enter; wherein, a plurality of hanging rings 192, preferably three, may be installed on the protective cover 190 for easy hanging;

[0055] A connecting ring 200 is also fixedly connected to the bell mouth 122. The bell mouth 122 is located inside the connecting ring 200 and is fixedly connected to the connecting ring 200. The pp filter cartridge 110 is located above the connecting ring 200 and the bottom surface is sealed with the connecting ring 200. The connecting ring 200 is also located inside the protective cover 190 and is detachably fixedly connected to the protective cover 190. The structure is simple and the cost is low.

[0056] like Figure 1 and Figure 4 as well as Figure 5 As shown, the filtering device 100 also includes an arc ring 210, which is located below the connecting ring 200 and fixedly connected to the connecting ring 200, and the one-way valve 121 is located in the arc ring 210 to protect the one-way valve 121; the concave arc surface of the arc ring 210 is away from the one-way valve 121; a plurality of grooves are provided on the connecting ring 200, and the grooves are opposite to the arc leaves 142 to discharge the sand cleared by the arc leaves 142.

[0057] like Figure 1 As shown, the filter device 100 further includes a first water level sensor 101, a second water level sensor 102, a first wire waterproof connector 103, a second wire waterproof connector 104, a third wire waterproof connector 105, and a fourth wire waterproof connector 106;

[0058] The first water level sensor 101 is fixedly connected to the outer wall of the side plate 1701 and is close to the circular cover plate 180, and the second water level sensor 102 is fixedly connected to the bottom surface of the disk 1114;

[0059] The first wire waterproof connector 103, the second wire waterproof connector 104 and the third wire waterproof connector 105 are all fixedly connected to the installation box 170, and the fourth wire waterproof connector 106 is fixedly connected to the bell mouth 122;

[0060] The first wire waterproof connector 103 and the second wire waterproof connector 104 are one-to-one inserted through the wire harnesses of the first water level sensor 101 and the second water level sensor 102 (not shown in the figure);

[0061] The third wire waterproof connector 105 and the fourth wire waterproof connector 106 are both used to pass the main cable, and the main cable (not shown in the figure) is respectively connected to the stepper motor 150 and the first water level sensor 101 and the second water level sensor 102 and the Hall sensor 107 for transmitting electric energy and communication, and has a simple structure, is easy to use and easy to install;

[0062] Furthermore, a Hall sensor 107 is included for detecting the rotation speed of the stepper motor 150; it is also possible to determine whether there is resistance or the resistance is increased due to the muddy water being too thick by detecting the working current of the stepper motor 150; wherein the Hall sensor 107 is used for rotation speed feedback.

[0063] like Figure 1 and Figure 4 As shown, the main cable and the water outlet nozzle 130 both pass through the arc ring 210, which is convenient to use.

[0064] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A precipitation and dust removal device for a subway station foundation pit, comprising a dredging structure and an automatic leakage structure located in a water collection well and a PP filter cartridge; characterized in that: The automatic leakage structure comprises: a one-way valve and a bell mouth, wherein the large mouth of the bell mouth is located above the small mouth, the water inlet of the one-way valve is fixedly connected to the small mouth of the bell mouth and the water outlet faces downward, and the bell mouth is arranged vertically; The PP filter cartridge is located above the large opening of the bell mouth and is sealed with the large opening of the bell mouth. The PP filter cartridge filters the muddy water in the water collection well outside the outer wall into clean water and then infiltrates into the inner cylinder. A water outlet is provided in the inner cylinder of the PP filter cartridge. The water outlet is connected to an external dust removal device through a water channel so that the dust removal device can extract clean water from the inner cylinder of the PP filter cartridge. The desilting structure comprises: a desilting frame and a stepping motor, the pp filter cartridge is located in the desilting frame, and the stepping motor drives the desilting frame to rotate to desilt the surface of the outer side wall of the pp filter cartridge; The inner cavity of the bell mouth and the inner cylinder of the PP filter cylinder together constitute a clear water tank, the desilting structure, the automatic leakage structure and the PP filter cylinder constitute a filtering device, and when the pressure in the clear water tank is greater than the pressure outside the water outlet of the one-way valve, the one-way valve discharges the clear water in the clear water tank; The filtering device further comprises: a supporting frame for supporting the pp filter cartridge; The support frame includes a first circular ring, a second circular ring, a plurality of first circular rods and a circular disk. The support frame is located in the inner cylinder of the PP filter cylinder. The plurality of first circular rods are located between the first circular ring and the second circular ring and are perpendicular to the first circular ring and the second circular ring. The plurality of first circular rods are fixedly connected to the first circular ring and the second circular ring. The plurality of first circular rods are arranged at intervals and are closely attached to the inner cylinder wall of the PP filter cylinder. The disk is located between the first circular ring and the second circular ring and is fixedly connected to the plurality of the first circular rods; The desilting frame comprises: a circular rotating disk and a plurality of arc-shaped leaves, wherein the plurality of arc-shaped leaves are arranged at intervals to surround the PP filter cartridge and are fixedly connected to the circular rotating disk, and the center of the circular rotating disk is fixedly connected to the driving end of the stepping motor; the plurality of arc-shaped leaves are all inclined downward; The filtering device further comprises a protective cover, which covers the dredging frame and is provided with a plurality of through holes on a side wall thereof facing the plurality of arc-shaped leaves; The bell mouth is also fixedly connected with a connecting ring, the bell mouth is located inside the connecting ring and is fixedly connected to the connecting ring, the pp filter cartridge is located above the connecting ring and the bottom surface is sealed with the connecting ring, the connecting ring is also located inside the protective cover and is detachably fixedly connected to the protective cover; The filtering device also includes an arc ring, which is located below the connecting ring and fixedly connected to the connecting ring, and the one-way valve is located in the arc ring; the concave arc surface of the arc ring is away from the one-way valve; and a plurality of grooves are provided on the connecting ring, and the grooves are opposite to the arc leaves.

2. The precipitation and dust removal device for subway station foundation pit according to claim 1, characterized in that: The water outlet passes through the side wall of the bell mouth and is sealed with the bell mouth.

3. The precipitation and dust removal device for subway station foundation pit according to claim 2, characterized in that: The desilting structure further comprises: a mounting box and a plurality of second round rods for fixing the mounting box; The installation box is composed of a side plate and a bottom plate that surround the bottom plate at 360 degrees. The side plate is located above the bottom plate and is fixedly and sealedly connected to the bottom plate. The side plate and the bottom plate cooperate to form an installation cavity. The installation box is located in the support frame and above the disc, a plurality of the second round rods pass through the disc and are fixedly connected to the side wall of the bell mouth, and ends of the plurality of the second round rods away from the bell mouth are detachably fixedly connected to the bottom plate; The stepper motor is vertically arranged in the installation cavity, the installation seat of the stepper motor is fixedly connected to the bottom plate, and the driving end of the stepper motor faces upward and extends out of the installation cavity.

4. The precipitation and dust removal device for subway station foundation pit according to claim 3, characterized in that: The filtering device further comprises a circular cover plate, which is located above the PP filter cartridge and is sealed with the top surface of the PP filter cartridge, and the circular cover plate is detachably fixedly connected to the side plate; The bottom surface of the circular cover plate is also sealed with the top surface of the side plate, and the driving end of the stepper motor passes through the circular cover plate and is sealed with the circular cover plate.

5. The precipitation and dust removal device for subway station foundation pit according to claim 4, characterized in that: The filtering device further includes a first water level sensor, a second water level sensor, a first wire waterproof connector, a second wire waterproof connector, a third wire waterproof connector, and a fourth wire waterproof connector; The first water level sensor is fixedly connected to the outer side wall of the side plate, and the second water level sensor is fixedly connected to the bottom surface of the disc; The first wire waterproof connector, the second wire waterproof connector and the third wire waterproof connector are all fixedly connected to the installation box, and the fourth wire waterproof connector is fixedly connected to the bell mouth; The first wire waterproof connector and the second wire waterproof connector are one-to-one inserted through the wiring harnesses of the first water level sensor and the second water level sensor; The third wire waterproof connector and the fourth wire waterproof connector are both used to pass a main cable, and the main cable is respectively connected to the stepper motor and the first water level sensor and the second water level sensor.

6. The precipitation and dust removal device for subway station foundation pit according to claim 5, characterized in that: The main cable and the water outlet nozzle both pass through the arc ring.

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