Rotary drum grillage machine and sewage treatment system

Abstract

The utility model discloses a rotary drum grillage machine, which relates to the technical field of sewage treatment, and mainly comprises a box body, a sewage cleaning device and a slag scraping plate, the box body is provided with a water inlet and a water outlet, the water inlet is used for introducing waste water, and the water outlet is used for discharging the waste water; a plurality of holes are formed in the sewage disposal device, the sewage disposal device is rotationally arranged in the box body, and water enters the periphery of the sewage disposal device; and the slag scraping plate is fixedly arranged on the box body, and the end part of the slag scraping plate is in contact with the periphery of the sewage disposal device for scraping slag. The utility model further provides a sewage treatment system which comprises the rotary drum grillage machine, a forebay, an adjusting tank and an integrated sewage tank, the forebay, the adjusting tank and the integrated sewage tank are sequentially connected, the rotary drum grillage machine is arranged at a water outlet of the forebay, solid matters are preliminarily intercepted, the adjusting tank can adjust water quantity and sediment, and the integrated sewage tank is connected with the adjusting tank through an adjusting tank lifting pump. The integrated sewage pool is used for treating sewage. The device can ensure that the occupied area is small, the structure is compact, and blockage is not prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a rotary drum screen machine and a sewage treatment system. Background Art

[0002] The existing integrated rural sewage treatment equipment is only equipped with a simple coarse screen in the water inlet well, which cannot filter the sewage well. The impurities in the sewage filtered by the coarse screen often clog and damage the water inlet pump of the next stage, causing paralysis of the entire sewage treatment system. The rotary drum screen machine can perform secondary treatment on the sewage treated by the coarse screen so that it meets the water treatment standards of the integrated sewage treatment equipment. However, the current sewage treatment plants equipped with rotary drum screen machines are basically large and medium-sized sewage treatment plants. Because the rotary drum screen machine is large in size, high in energy consumption, and the equipment is relatively bulky, this type of rotary drum screen machine is not suitable for application in rural sewage treatment equipment. Therefore, there is a need for a rotary drum screen machine that occupies a small area, has a compact structure, and is suitable for small sewage treatment plants.

[0003] Patent CN117398751A discloses an internal flow rotary drum screen machine, including a rotary drum assembly, which includes a rotary drum and a feed port and a discharge port located at both ends of the rotary drum. The inner wall of the rotary drum is provided with spiral blades, which are used to transport solid slag retained in the inner cavity of the rotary drum to the discharge port. Although this type of internal flow rotary drum screen machine is relatively small in size, its discharge method is to discharge solid waste through the spiral blades. Since the rotation of the spiral blades requires a certain distance from the side wall of the rotary drum, after a long period of small accumulation, there is a risk of clogging the rotary drum, and the inner wall of the rotary drum will not be able to play a filtering role. Therefore, there is a need for a rotary drum screen machine that is small in size, compact in structure, and not prone to clogging. Utility Model Content

[0004] The purpose of the utility model is to provide a rotary drum screen machine and a sewage treatment system to solve the problems existing in the above-mentioned prior art, and to ensure that the occupied area is small, the structure is compact, and it is not easy to be blocked.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a rotary drum screen machine, comprising

[0007] A box body, wherein the box body is provided with a water inlet and a water outlet, the water inlet is used to allow wastewater to enter, and the water outlet is used to discharge wastewater;

[0008] A sewage cleaning device, wherein a plurality of holes are provided on the sewage cleaning device, the sewage cleaning device is rotatably arranged inside the box, and water enters the periphery of the sewage cleaning device;

[0009] A scraper plate is fixedly arranged on the box body and an end of the scraper plate contacts the periphery of the cleaning device for scraping debris.

[0010] Preferably, the middle portion of the scraper is fixed to the box body, the first end of the scraper is arranged in contact with the cleaning device, and the second end is arranged outside the box body for discharging waste.

[0011] Preferably, the dirt cleaning device is a dirt cleaning net drum, and the dirt cleaning net drum can rotate around its central axis relative to the box.

[0012] Preferably, a reduction motor is further included, the output shaft of the reduction motor is rotatably connected to the housing through a bearing, and the output shaft of the reducer is connected to the cleaning net drum and can drive the cleaning net drum to rotate along its own axis.

[0013] Preferably, it also includes a speed control handle and an electronic speed regulator, the speed control handle is electrically connected to the electronic speed regulator, the electronic speed regulator is electrically connected to the reduction motor, and the electronic speed regulator can adjust the speed of the reduction motor according to the rotation position of the speed control handle.

[0014] Preferably, the water inlet is arranged on the side of the box body, the water outlet is arranged at the bottom of the box body, and the water outlet is arranged in an inverted cone shape, the large end of the water outlet is connected to the box body, and the small end of the water outlet is arranged close to the ground.

[0015] Preferably, it further comprises a water inlet buffer box, which is arranged in a conical shape, with a large end of the water inlet buffer box fixedly connected to the box body, and a small end of the water inlet fixedly connected to the water inlet, for mitigating the impact force of water.

[0016] Preferably, it further comprises a sight glass hole, which is provided on the box body and is used to observe the operating status of the cleaning device inside the box body.

[0017] The utility model also provides a sewage treatment system, comprising a forebay, a regulating tank, an integrated sewage tank and the rotary drum screen machine as described above, wherein the forebay, the regulating tank and the integrated sewage tank are connected in sequence, the rotary drum screen machine is arranged at the water outlet of the forebay for preliminarily intercepting solid matter, the regulating tank is capable of regulating water volume and sedimentation, the integrated sewage tank is connected to the regulating tank via a regulating tank lift pump, and the integrated sewage tank is used to treat sewage;

[0018] The integrated sewage pool includes an anoxic pool, an aerobic pool, a membrane pool, a sedimentation pool, a sludge storage pool and an outlet pool which are connected in sequence.

[0019] Preferably, a float level gauge is provided in the forebay, and the float level gauge is fixedly connected to a switch rod. The controller of the reduction motor of the cleaning device is arranged close to the switch rod. When the liquid level in the forebay rises, the switch rod contacts the controller and the reduction motor runs; when the liquid level in the forebay drops, the switch rod is separated from the controller and the reduction motor stops running.

[0020] Compared with the prior art, the utility model has achieved the following technical effects:

[0021] The utility model is provided with a water inlet and a water outlet on the box body, the water inlet is used to introduce wastewater, and the water outlet is used to discharge wastewater. A plurality of holes are provided on the cleaning device. The cleaning device is rotatably arranged inside the box body, and water enters the periphery of the cleaning device. A scraper is fixedly arranged on the box body, and the end of the scraper is in contact with the periphery of the cleaning device for scraping debris. The cleaning device is rotatably arranged inside the box body, and can contact the wastewater over a large area. Impurities in the wastewater are effectively filtered through the plurality of holes on its periphery. As the cleaning device rotates continuously, the cleaning work can be continuously performed, greatly improving the cleaning efficiency. The scraper is fixedly arranged on the box body, and the end of the scraper is in contact with the periphery of the cleaning device. It can promptly scrape away waste residue intercepted by the cleaning device, ensuring that the cleaning device always maintains good filtering performance, further improving the overall cleaning effect, and not prone to clogging. At the same time, the combined design of the cleaning device and the scraper fully utilizes the internal space of the box body, has a compact structure, does not occupy too much additional space, and is suitable for a variety of installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a structural diagram of a rotary drum screen machine in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic structural diagram of a sewage treatment system in an embodiment of the present utility model;

[0025] Figure 3 This is a connection circuit diagram of the reduction motor and the float liquid level gauge in the embodiment of the utility model.

[0026] In the figure: 101-drum screen machine, 1-box; 2-cleaning device; 3-water inlet; 4-water outlet; 5-water inlet buffer tank; 6-speed control handle; 7-reduction motor; 8-scraper; 9-bearing; 10-frame; 11-sightglass hole; 12-forebay; 13-float level gauge; 14-forebay lifting pump; 15-regulating tank; 16-regulating tank lifting pump; 17-anoxic tank; 18-aerobic tank; 19-membrane tank; 20-sedimentation tank; 21-sludge storage tank; 22-outlet tank. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] The purpose of the utility model is to provide a rotary drum screen machine and a sewage treatment system to solve the problems existing in the prior art, and to ensure that the occupied area is small, the structure is compact, and the system is not prone to clogging.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] Example 1

[0031] like Figure 1-Figure 3As shown, the utility model provides a rotary drum screen machine 101, including a box body 1, a cleaning device 2 and a scraper 8. The box body 1 is provided with a water inlet 3 and a water outlet 4, the water inlet 3 is used to allow wastewater to enter, and the water outlet 4 is used to discharge wastewater; a plurality of holes are provided on the cleaning device 2, the cleaning device 2 is rotatably arranged inside the box body 1, and water enters the periphery of the cleaning device 2; the scraper 8 is fixedly arranged on the box body 1 and the end of the scraper 8 contacts the periphery of the cleaning device 2 for scraping debris. The cleaning device 2 is rotatably mounted inside the housing 1 and is capable of contacting the wastewater over a large area. It effectively filters impurities in the wastewater through multiple holes on its periphery. As the cleaning device 2 rotates continuously, the cleaning operation can be continued, greatly improving the cleaning efficiency. The scraper 8 is fixedly mounted on the housing 1 and its end contacts the periphery of the cleaning device 2, enabling timely scraping of waste residue intercepted by the cleaning device 2, ensuring that the cleaning device 2 always maintains good filtering performance. This further enhances the overall cleaning effect and makes clogging less likely. Furthermore, the scraper 8 is configured to automatically scrape residue without requiring additional operation, reducing manual intervention, operational difficulty, and labor intensity. Furthermore, the combined design of the cleaning device 2 and the scraper 8 fully utilizes the internal space of the housing 1, is compact, and does not occupy excessive additional space. This design makes it suitable for a variety of installation environments, particularly for small rural sewage treatment plants.

[0032] It should be noted that since multiple holes are provided on the sewage cleaning device 2, after the sewage enters the box body 1, it will be filtered through the holes and then flow out. The water level inside the box body 1 will not be higher than the scraper plate 8, and there will be no sewage overflow. The box body 1 is fixed to the ground through the frame 10 and can operate stably.

[0033] In some embodiments, the middle portion of the scraper plate 8 is fixed to the housing 1, the first end of the scraper plate 8 is arranged in contact with the cleaning device 2, and the second end is arranged outside the housing 1 for discharging waste. The first end of the scraper plate 8 is arranged in contact with the cleaning device 2, and can promptly and tightly scrape off the waste during the rotation of the cleaning device 2, ensuring that the cleaning device 2 always maintains good filtering performance and improves the cleaning efficiency. The second end of the scraper plate 8 is arranged outside the housing 1, and can directly discharge the scraped waste, avoiding the accumulation of waste inside the housing 1, which affects the cleaning effect and equipment operation. The direct discharge of waste makes the slag discharge process more efficient and smooth. Moreover, this design of the scraper plate 8 makes full use of the internal and external space of the housing 1, does not occupy too much internal space of the housing 1, and can effectively discharge waste. The compact design makes the entire device more compact and flexible, and is suitable for a variety of places with limited space.

[0034] In some embodiments, the cleaning device 2 is a cleaning mesh drum that can rotate around its central axis relative to the housing 1. The cleaning mesh drum has a large filtration area and can effectively intercept impurities when wastewater passes through. Its mesh structure can be designed according to different cleaning needs to ensure effective filtration of waste residues of various sizes. As the cleaning mesh drum rotates around the central axis, different parts contact the wastewater in turn, achieving continuous filtration and greatly improving the cleaning efficiency. When the rotating cleaning mesh drum contacts the scraper plate 8, the scraper plate 8 can scrape off the waste residue on the surface of the mesh drum, thereby playing a role of automatic cleaning.

[0035] It should be noted that the cleaning net cylinder is made of 316L stainless steel. 316L stainless steel has strong overall rigidity and high corrosion resistance, which can enhance separation ability and corrosion resistance.

[0036] In some embodiments, the rotary drum screen machine 101 further includes a reduction motor 7, the output shaft of which is connected to the cleaning screen drum via a bearing 9 and is capable of driving the cleaning screen drum to rotate along its own axis. One feasible method is to have the output shaft of the reduction motor 7 fixedly connected to the inner ring of the bearing 9, the cleaning screen drum having a central axis, the central axis of the cleaning screen drum being fixedly connected to the inner ring of the bearing 9, and the outer ring of the bearing 9 being fixedly connected to the housing 1. The reduction motor 7 can precisely control the rotational speed of the output shaft, thereby achieving precise regulation of the rotational speed of the cleaning screen drum. The rotational speed of the cleaning screen drum can be adjusted according to different wastewater flow rates, waste residue content, and treatment requirements to achieve the optimal cleaning effect.

[0037] In some embodiments, the rotary drum screen machine 101 further includes a speed regulating handle 6 and an electronic speed regulator. The speed regulating handle 6 is electrically connected to the electronic speed regulator, which is electrically connected to the reduction motor 7. The electronic speed regulator can adjust the speed of the reduction motor 7 according to the rotation position of the speed regulating handle 6. The setting of the speed regulating handle 6 allows the operator to conveniently adjust the operating speed of the rotary drum screen machine 101 according to actual conditions. Whether it is to deal with wastewater of different flows, waste residues of different sizes, or according to the requirements of different treatment stages, precise speed regulation can be achieved by rotating the speed regulating handle 6. The electronic speed regulator can quickly respond to the signal of the speed regulating handle 6 and accurately adjust the speed of the reduction motor 7, thereby realizing real-time adjustment of the speed of the cleaning screen drum, greatly improving the flexibility and adaptability of the equipment.

[0038] In some embodiments, the water inlet 3 is provided on the side of the housing 1, and the water outlet 4 is provided at the bottom of the housing 1. The water outlet 4 is provided in an inverted cone shape, with the large end of the water outlet 4 connected to the housing 1, and the small end of the water outlet 4 is provided close to the ground. The water inlet 3 is provided on the side of the housing 1 so that wastewater can enter the interior of the housing 1 in a relatively stable manner. When wastewater flows in from the side, it can reduce the direct impact on the internal structure of the housing 1, avoiding damage to the equipment or affected cleaning effect due to excessive water flow impact. The water outlet 4 is provided at the bottom of the housing 1 and is in an inverted cone shape. This design is conducive to guiding the wastewater to flow out of the housing 1 smoothly. The inverted cone-shaped water outlet 4 can gradually shrink the water flow during the outflow process, increase the water flow speed, and improve the drainage efficiency. The small end is close to the ground, so that the sewage can be discharged smoothly and the waste residue in the water is not easily accumulated at the water outlet 4 under the action of gravity, thereby effectively preventing the water outlet 4 from being blocked. Even if a small amount of waste residue enters the water outlet 4, it will be more easily washed away by the water flow due to the guidance of the cone structure.

[0039] In some embodiments, the rotary drum screen machine 101 further includes a water inlet buffer tank 5, which is conically shaped. The large end of the water inlet buffer tank 5 is fixedly connected to the housing 1, and the small end is fixedly connected to the water inlet 3, thereby mitigating the impact of water. The conical shape of the water inlet buffer tank 5 allows wastewater to gradually diffuse within the conical space when entering the buffer tank through the water inlet 3, thereby mitigating the impact of the water. The conical design serves as a transitional mechanism, preventing flow disturbances caused by sudden changes in pipe diameter and preventing wastewater from directly entering the housing 1 with significant force, potentially damaging equipment components such as the cleaning screen.

[0040] In some embodiments, the rotary drum screen machine 101 further includes a sight glass hole 11, which is provided on the housing 1 and is used to observe the operating status of the cleaning device 2 inside the housing 1. The sight glass hole 11 provided on the housing 1 provides an operator with a window for directly observing the operating status of the cleaning device 2 inside the housing 1. Through the sight glass hole 11, the operator can understand in real time the rotation of the cleaning screen, the working effect of the scraper 8, and the flow of wastewater, etc., which helps to promptly detect abnormal conditions in the operation of the equipment, such as blockage of the cleaning screen, damage to the scraper 8, abnormal wastewater flow, etc., so that appropriate measures can be taken to deal with them and prevent further expansion of equipment failures.

[0041] Example 2

[0042] This embodiment further provides a sewage treatment system, including a forebay 12, a regulating tank 15, an integrated sewage tank, and the rotary drum screen machine 101 as described in Example 1. The forebay 12, regulating tank 15, and integrated sewage tank are connected in sequence. The rotary drum screen machine 101 is provided at the water outlet 4 of the forebay 12 for initially intercepting solid matter. A forebay lift pump 14 is provided in the forebay 12 to deliver sewage to the rotary drum screen machine 101. The regulating tank 15 can regulate water volume and sedimentation. The integrated sewage tank is connected to the regulating tank via a regulating tank lift pump 16. The integrated sewage tank is used to treat sewage.

[0043] Among them, the integrated sewage pool includes an anoxic tank 17, an aerobic tank 18, a membrane tank 19, a sedimentation tank 20, a sludge storage tank 21 and an outlet tank 22 which are connected in sequence. The anoxic tank 17 and the aerobic tank 18 use anaerobic microorganisms and aerobic microorganisms to treat sewage respectively, the membrane tank 19 uses membranes to treat sewage, the sedimentation tank 20 is used for sedimentation, the sludge storage tank 21 is used to store sludge, and the outlet tank 22 is used to discharge qualified treated water.

[0044] In some embodiments, a float level gauge 13 is provided in the forebay 12. The float level gauge 13 is fixedly connected to a switch rod. The controller of the reduction motor 7 of the cleaning device 2 is located near the switch rod. When the liquid level in the forebay 12 rises, the switch rod contacts the controller, and the reduction motor 7 operates. When the liquid level in the forebay 12 decreases, the switch rod separates from the controller, and the reduction motor 7 stops. The float level gauge 13 and the switch rod are used to automatically control the reduction motor 7 without manual intervention. When the liquid level in the forebay 12 rises, the switch rod contacts the controller, automatically starting the reduction motor 7 for cleaning. When the liquid level decreases, the switch rod separates from the controller, and the reduction motor 7 stops, saving energy.

[0045] Specific control circuits such as Figure 3 As shown, the left side is the primary circuit, and the right side is the secondary control circuit. The primary circuit diagram includes circuit breaker F1, AC contactor KM1, thermal overload relay FR, and reduction motor M. The secondary control circuit includes manual-automatic transfer switch S1, float switch, indicator light, etc.

[0046] Close circuit breaker F1 to connect the power supply, switch the manual-automatic switch to manual closing, coil KM1 energizes, and the thermal overload relay FR (contacts 95-96) is a normally closed switch. The reduction motor will continue to run unless it is overloaded. If an overload occurs, the thermal overload relay FR (contacts 95-96) disconnects, the reduction motor is de-energized and stops, the thermal overload relay FR (contacts 97-98) closes, and the fault indicator lights up. When the manual-automatic switch is switched to automatic, the liquid level in the front well is high, the float switch (contacts 13-14) is in the on state, the automatic operation indicator lights up, and the reduction motor operates normally. The liquid level in the front well is low, the float switch (contacts 13-14) is in the off state, the automatic operation indicator lights up, and the reduction motor stops running.

[0047] The working principle of the rotary drum screen machine 101 is as follows:

[0048] The water inlet 3 of the rotary drum screen machine 101 is connected to the water outlet 4 of the forebay lift pump 14 of the forebay 12 through a plastic pipe (UPVC pipe). First, the forebay lift pump 14 transports the sewage from the forebay to the water inlet buffer tank 5 through the UPVC pipe. As the sewage level in the water inlet buffer tank 5 rises, the domestic sewage slowly enters the cleaning net cylinder. The cleaning net cylinder rotates under the drive of the reduction motor 7. The holes on the surface of the cleaning net cylinder intercept large particles of solids and suspended matter on the outer surface of the holes. The filtered large particles of impurities are removed from the surface of the holes by the scraper plate 8 as the cleaning net cylinder rotates. The scraper plate 8 maintains a small distance from the surface of the cleaning net cylinder and is basically in contact with it. It can scrape off impurities in real time, ensure that the holes are not blocked by dirt, and can continuously and automatically remove impurities. The filtered domestic sewage is discharged through the outlet 4 into the regulating tank 15 for the next step of treatment. A sight glass hole 11 for observing the inside of the cleaning net cylinder is provided on the side of the rotary drum screen machine 101. The box body 1 is made of corrosion-resistant 304 stainless steel and is fixed with anti-corrosion screws. If the equipment fails, the box body 1 can be removed for maintenance.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A rotary drum screen machine, characterized in that: include A box body, wherein the box body is provided with a water inlet and a water outlet, the water inlet is used to allow wastewater to enter, and the water outlet is used to discharge wastewater; A sewage cleaning device, wherein a plurality of holes are provided on the sewage cleaning device, the sewage cleaning device is rotatably arranged inside the box, and water enters the periphery of the sewage cleaning device; A scraper plate is fixedly arranged on the box body and the end of the scraper plate contacts the periphery of the cleaning device for scraping residue, and the middle part of the scraper plate is fixed on the box body, the first end of the scraper plate is arranged in contact with the cleaning device, and the second end is arranged outside the box body for discharging waste.

2. The rotary drum screen machine according to claim 1, characterized in that: The dirt cleaning device is a dirt cleaning net drum, and the dirt cleaning net drum can rotate around its central axis relative to the box body.

3. The rotary drum screen machine according to claim 2, characterized in that: It also includes a reduction motor, the output shaft of which is rotatably connected to the box body through a bearing, and the output shaft of the reduction motor is connected to the cleaning net cylinder and can drive the cleaning net cylinder to rotate along its own axis.

4. The rotary drum screen machine according to claim 3, characterized in that: It also includes a speed regulating handle and an electronic speed regulator, wherein the speed regulating handle is electrically connected to the electronic speed regulator, and the electronic speed regulator is electrically connected to the reduction motor. The electronic speed regulator can adjust the speed of the reduction motor according to the rotation position of the speed regulating handle.

5. The rotary drum screen machine according to claim 1, characterized in that: The water inlet is arranged on the side of the box body, the water outlet is arranged at the bottom of the box body, and the water outlet is arranged in an inverted cone shape. The large end of the water outlet is connected to the box body, and the small end of the water outlet is arranged close to the ground.

6. The rotary drum screen machine according to claim 1, characterized in that: It also includes a water inlet buffer box, which is conical in shape. The large end of the water inlet buffer box is fixedly connected to the box body, and the small end is fixedly connected to the water inlet, so as to reduce the impact force of water.

7. The rotary drum screen machine according to claim 1, characterized in that: It also includes a sight glass hole, which is arranged on the box body and is used to observe the operating status of the cleaning device inside the box body.

8. A sewage treatment system, characterized in that: It comprises a forebay, a regulating tank, an integrated sewage tank and a rotary drum screen machine according to any one of claims 1 to 7, wherein the forebay, the regulating tank and the integrated sewage tank are connected in sequence, the rotary drum screen machine is arranged at the water outlet of the forebay for preliminary interception of solid matter, the regulating tank is capable of regulating water volume and sedimentation, the integrated sewage tank is connected to the regulating tank via a regulating tank lift pump, and the integrated sewage tank is used to treat sewage; The integrated sewage pool includes an anoxic pool, an aerobic pool, a membrane pool, a sedimentation pool, a sludge storage pool and an outlet pool which are connected in sequence.

9. The sewage treatment system according to claim 8, characterized in that: A float level gauge is provided in the forebay, and the float level gauge is fixedly connected to a switch rod. The controller of the reduction motor of the sewage cleaning device is arranged close to the switch rod. When the liquid level in the forebay rises, the switch rod contacts the controller and the reduction motor runs; when the liquid level in the forebay drops, the switch rod is separated from the controller and the reduction motor stops running.

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