Backflow control system

Abstract

The utility model discloses a backflow control system. The backflow control system comprises at least one water tank; the collecting area is arranged at a position adjacent to the corresponding water tank; the middle storage device is respectively communicated with the water tank and the collecting area; the liquid level detection device is arranged in the water tank; the first conveying device is arranged between the middle storage device and the water tank and is used for conveying the liquid in the middle storage device to the water tank; the second conveying device is communicated with the water tank and is used for conveying liquid of an external liquid source to the water tank; and the control unit is electrically connected with the liquid level detection device, the first conveying device and the second conveying device. And the backflow control system comprises a water tank and a collecting area which are adjacently arranged, and an intermediate storage device communicated with the water tank and the collecting area, so that the tank mixing phenomenon is effectively reduced, and the product surface quality is improved. Liquid backflow is achieved through the first conveying device, the system achieves cyclic utilization of liquid resources, waste liquid discharge is reduced, and the environmental burden is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel product coating, in particular to a reflux control system. Background Art

[0002] In the pretreatment process of the steel product coating production line, the problem of cross-tank has always been an important factor affecting product quality and production efficiency. The cross-tank phenomenon mainly occurs between adjacent functional areas, especially between the degreasing area and the phosphatizing area. Since the degreasing solution is alkaline (pH 9.5 - 11), while the phosphatizing solution is acidic (pH 4.5 - 5.5), the mixing of the two solutions will cause the pharmaceutical agent to fail and the pH value to get out of control, thus affecting the surface quality of the product.

[0003] In related technologies, a transition area is used to collect the solution brought out by the steel product from the previous functional area to reduce the cross-tank phenomenon. However, these collected solutions are often directly discharged to the sewage treatment station, resulting in waste of liquid resources and environmental burden. Therefore, there is an urgent need for a solution to avoid the problems of waste of liquid resources and excessive environmental burden. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a reflux control system to solve the above technical problems.

[0005] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] A reflux control system, comprising:

[0007] At least one water tank;

[0008] A collection area, arranged at a position adjacent to the corresponding water tank;

[0009] An intermediate storage device, communicating with the water tank and the collection area respectively;

[0010] A liquid level detection device, arranged in the water tank;

[0011] A first conveying device, arranged between the intermediate storage device and the water tank, for conveying the liquid in the intermediate storage device to the water tank;

[0012] A second conveying device, communicating with the water tank, for conveying the liquid from an external liquid source to the water tank;

[0013] A control unit, electrically connected to the liquid level detection device, the first conveying device and the second conveying device respectively.

[0014] Wherein, a plurality of water tanks are provided, and the water tanks include a chemical solution tank and a clean water tank.

[0015] Among them, a first pH detection device is provided in the chemical solution tank, and the first pH detection device is electrically connected to a chemical addition device, and the chemical addition device is used to add chemicals into the chemical solution tank.

[0016] Among them, the chemical solution tank and the clean water tank are respectively communicated with the intermediate storage device; among them, a second pH detection device is provided in the intermediate storage device communicated with the chemical solution tank, and a conductivity detection device is provided in the intermediate storage device communicated with the clean water tank.

[0017] Among them, the first conveying device includes a reflux pipeline and a first water pump thereon, and the second conveying device includes a water replenishing pipeline and a second water pump thereon.

[0018] Among them, the intermediate storage device is a storage tank, and the storage tank is communicated with its corresponding collection area through a recovery pipeline and is communicated with its corresponding water tank through the reflux pipeline.

[0019] Among them, an overflow pipeline is connected to the upper part of the storage tank, and a discharge pipeline is connected to the bottom. The liquid inlet ends of the overflow pipeline communicated with the storage tank are respectively higher than the liquid outlet end of the recovery pipeline and the liquid inlet end of the reflux pipeline.

[0020] Among them, the liquid level detection device includes a liquid level sensor.

[0021] Among them, the control unit includes a programmable logic controller.

[0022] The beneficial technical effects of the present utility model: The reflux control system includes adjacent water tanks and collection areas, and an intermediate storage device communicated therewith, effectively reducing the phenomenon of cross-tank, and improving the surface quality of the product. The liquid reflux is realized through the first conveying device between the water tank and the intermediate storage device, and the system can complete the recycling of liquid resources, reduce the waste liquid discharge, and reduce the environmental burden. Description of the Drawings

[0023] Figure 1 It is a system schematic diagram of an embodiment of the present utility model;

[0024] Figure 2 It is a schematic diagram of the cooperation between the control unit of the system of the embodiment of the present utility model and other components;

[0025] Figure 3 It is a schematic diagram of the first conveying device of the system of the embodiment of the present utility model;

[0026] Figure 4 It is a schematic diagram of the second conveying device of the system of the embodiment of the present utility model;

[0027] Figure 5 It is a schematic diagram of the cooperation between the chemical addition device of the system of the embodiment of the present utility model and other components;

[0028] Figure 6 Schematic diagrams of multiple water tanks of the system according to embodiments of the present utility model.

[0029] Explanation of reference numerals:

[0030] In the figure: 10 - water tank, 11 - chemical solution tank, 12 - clean water tank, 20 - collection area, 30 - intermediate storage device, 31 - recovery pipeline, 32 - overflow pipeline, 33 - discharge pipeline, 40 - liquid level detection device, 50 - first conveying device, 51 - return pipeline, 52 - first water pump, 60 - second conveying device, 61 - water replenishing pipeline, 62 - second water pump, 70 - control unit, 81 - first pH detection device, 82 - second pH detection device, 90 - chemical addition device, 100 - conductivity detection device. Specific embodiments

[0031] To make the technical solutions of the present utility model clearer and more definite for those skilled in the art, the present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings. However, the embodiments of the present utility model are not limited thereto.

[0032] As Figures 1 - 6 shown, the reflux control system provided in this embodiment is mainly used in the pretreatment process of a steel product painting production line.

[0033] The system includes at least one water tank 10, a collection area 20, an intermediate storage device 30, a liquid level detection device 40, a first conveying device 50, a second conveying device 60, and a control unit 70.

[0034] The water tank 10 is used to hold the liquid required for the process, which can be a chemical solution (such as degreasing solution or phosphatizing solution) or a cleaning solution.

[0035] The collection area 20 is disposed adjacent to the corresponding water tank 10. The main function of the collection area 20 is to temporarily collect the liquid flowing down from the workpiece. Here, the workpiece refers to the workpiece separated from the water tank 10. Generally, the workpiece will carry out the liquid in the water tank 10 and is likely to be mixed with the liquid in the next water tank 10. The design of the collection area 20 can reduce the occurrence of mixing (cross-tank) phenomena and also play a role in short-term storage.

[0036] The intermediate storage device 30 is in communication with both the water tank 10 and the collection area 20. Its main function is to collect and store the liquid flowing down from the collection area 20, and then convey these liquids back into the water tank 10 to achieve the recycling of the liquid. This design improves the resource utilization efficiency and reduces the waste liquid discharge.

[0037] The liquid level detection device 40 is installed inside the water tank 10 and is used to monitor the liquid level height in the water tank 10.

[0038] The first conveying device 50 is arranged between the intermediate storage device 30 and the water tank 10. Its main function is to convey the liquid collected in the intermediate storage device 30 back to the water tank 10 to achieve the recycling of the liquid.

[0039] The second conveying device 60 is connected to the water tank 10 and is used to convey the liquid (such as clean water) from an external liquid source to the water tank 10 when needed. This ensures the stability of the total amount of liquid in the water tank 10 and replenishes the liquid lost due to reasons such as the workpiece being taken out.

[0040] The control unit 70 is electrically connected to the liquid level detection device 40, the first conveying device 50, and the second conveying device 60. According to the signal of the liquid level detection device 40, the control unit 70 can control the operating states of the first conveying device 50 and the second conveying device 60, thereby realizing the adjustment of the liquid level in the water tank 10.

[0041] This design realizes the effective collection and recycling of the liquid, effectively reduces the waste liquid discharge, and has good economic and environmental benefits.

[0042] In one embodiment, the system includes multiple water tanks 10, which are divided into two categories: the chemical solution tank 11 and the clean water tank 12. This design aims to meet the different requirements of the pretreatment process of the steel product painting production line.

[0043] The chemical solution tank 11 is used to hold the chemical solution with a specific concentration, mainly including the degreasing tank and the phosphatizing tank:

[0044] The degreasing tank holds the degreasing liquid, which is alkaline (pH value is between 9.5 - 11); the phosphatizing tank holds the phosphatizing liquid, which is acidic (pH value is between 4.5 - 5.5); the clean water tank 12 holds clean water and is used to rinse the workpiece.

[0045] Each water tank 10 is equipped with a corresponding collection area 20, an intermediate storage device 30, a liquid level detection device 40, a first conveying device 50, a second conveying device 60, and a control unit 70 to form an independent reflux control subsystem. This design enables different - nature liquids to be recycled separately, avoids cross - contamination, and also facilitates the separate liquid level control of different liquids.

[0046] In this embodiment, equipping each tank with an independent reflux control subsystem can effectively prevent the mixing of different - nature chemical solutions, ensure the effect of each treatment step, and thus improve the surface quality of the product and the overall production efficiency.

[0047] In some embodiments, the degreasing tank includes a pre-degreasing tank and a main degreasing tank arranged in sequence (not shown in the attached drawings). The water tank 12 includes a hot water tank 10 located in front of the pre-degreasing tank, a common water tank 12 located between the two pre-degreasing tanks and the main degreasing tank, and a common water tank 12 located between the main degreasing tank and the phosphatizing tank. The phosphatizing tank is located at the last position.

[0048] In some embodiments, the collection area 20 adopts a funnel-shaped structure, the width of the upper opening is equivalent to the width of the tank body of the water tank 10, and the lower part is narrowed and connected to the recovery pipeline 31.

[0049] In one embodiment, a first pH detection device 81 is respectively arranged in the degreasing tank and the phosphatizing tank, and a dosing device 90 is provided in support thereof.

[0050] For the degreasing tank, the first pH detection device 81 therein continuously monitors the alkalinity of the degreasing solution to ensure that its pH is maintained within the range of 9.5 - 11.

[0051] For the phosphatizing tank, the first pH detection device 81 therein continuously monitors the acidity of the phosphatizing solution to ensure that its pH is maintained within the range of 4.5 - 5.5.

[0052] The dosing device 90 is electrically connected to the first pH detection device 81, and automatically adds corresponding medicaments into the degreasing tank or the phosphatizing tank according to the pH detection result.

[0053] For the degreasing tank, when it is detected that the pH value is lower than 9.5, the dosing device 90 will automatically add an appropriate amount of alkaline medicament to adjust the pH value to the appropriate range.

[0054] For the phosphatizing tank, when it is detected that the pH value is higher than 5.5, the dosing device 90 will automatically add an appropriate amount of acidic medicament to adjust the pH value to the appropriate range.

[0055] This design realizes the automatic monitoring and adjustment of the pH value in the chemical solution tank 11, reduces manual intervention, and improves production efficiency.

[0056] In some embodiments, the first pH detection device 81 adopts an industrial pH meter, which includes a pH electrode and a pH controller (not shown in the attached drawings).

[0057] The pH electrode can generate a corresponding weak voltage signal according to the acidity and alkalinity of the solution. The pH controller is electrically connected to the pH electrode, can receive the weak voltage signal from the pH electrode, amplify it and convert it into a standard 4 - 20mA current signal.

[0058] In some embodiments, the chemical dosing device 90 includes a precision chemical dosing metering pump, which can adjust the chemical dosing amount according to the output signal of the first pH detection device 81 (mainly a 4-20 mA analog signal or a digital communication signal). For example, a 4 mA signal can correspond to no chemical dosing, a 20 mA signal corresponds to the maximum chemical dosing amount, and intermediate values correspond to different chemical dosing values.

[0059] In one embodiment, the chemical solution tank 11 and the clean water tank 12 are respectively connected to independent intermediate storage devices 30. By providing corresponding detection devices in different intermediate storage devices 30, the detection and treatment of the quality of the recycled liquid are realized. Specifically:

[0060] A second pH detection device 82 is provided in each of the intermediate storage devices 30 connected to the chemical solution tank 11 (including the degreasing tank and the phosphatizing tank). The purpose of this design is to monitor the pH value of the chemical solution recycled from the collection area 20 to ensure that the recycled chemical solution remains within a suitable pH range.

[0061] By detecting the pH value of the recycled chemical solution, it can be determined whether the recycled chemical solution needs to flow back into the corresponding chemical solution tank 11.

[0062] If an abnormal pH value is detected (for example, an abnormal acidity appears in the intermediate storage device 30 connected to the degreasing tank), it can be discharged as waste liquid.

[0063] A conductivity detection device 100 is provided in the intermediate storage device 30 connected to the clean water tank 12. Conductivity is an important indicator for measuring the total amount of dissolved ions in water and can indirectly reflect the cleanliness of the cleaning liquid.

[0064] By measuring the conductivity, it can be determined whether the recycled cleaning liquid is still suitable for reuse.

[0065] If the conductivity exceeds the set threshold, it can be discharged as waste liquid.

[0066] The above design can maximize the utilization of recyclable liquids and reduce unnecessary waste liquid emissions by monitoring the quality of the recycled liquid. At the same time, ensuring that the liquid flowing back to each tank always remains in a suitable state helps to maintain the stability of the entire treatment process.

[0067] In some embodiments, the second pH detection device 82 uses an industrial pH meter, which includes a pH electrode and a pH controller. The pH electrode can generate a corresponding weak voltage signal according to the pH value of the solution. The pH controller is electrically connected to the pH electrode, can receive the weak voltage signal from the pH electrode, amplify it and convert it into a standard 4-20 mA current signal, and then convert it into a digital signal for processing, and finally accurately display the pH value.

[0068] In some embodiments, when the solution conductivity in the intermediate storage device 30 is lower than 1000 μS / cm, it indicates that the solution can be directly reused. This not only saves water resources but also reduces the amount of wastewater to be treated.

[0069] When the conductivity is higher than 1000 μS / cm, the solution needs to be discharged to the sewage treatment station instead of being refluxed into the corresponding clean water tank 12. This can ensure that the water quality in the clean water tank 12 is always suitable, which is beneficial to maintaining the cleaning quality of steel products.

[0070] In this embodiment, the detection probe of the conductivity detection device 100 can adopt a 2-electrode conductivity sensor of the InPro7001 / 120-VP model.

[0071] In one embodiment, the conveying device in the system specifically includes a first conveying device 50 and a second conveying device 60, which are respectively responsible for the reflux and replenishment of the liquid.

[0072] The first conveying device 50 is composed of a reflux pipeline 51 and a first water pump 52 installed thereon. The main function of this device is to convey the liquid collected in the intermediate storage device 30 back to the corresponding water tank 10.

[0073] The reflux pipeline 51 connects the intermediate storage device 30 and the corresponding water tank 10 to ensure that the liquid can flow smoothly back to the water tank 10.

[0074] The first water pump 52 is installed on the reflux pipeline 51 and is used to control the flow rate and pressure of the reflux liquid to ensure that the liquid can be effectively conveyed from the intermediate storage device 30 to the water tank 10.

[0075] The first water pump 52 is connected to the control unit 70 and can be automatically started and stopped according to the signal of the liquid level detection device 40.

[0076] The second conveying device 60 is composed of a water replenishing pipeline 61 and a second water pump 62 installed thereon. The main function of this device is to convey the liquid from an external liquid source (usually clean water) to the water tank 10 when needed.

[0077] One end of the water replenishing pipeline 61 is connected to an external liquid source (such as a tap water system or a pure water system), and the other end is connected to the corresponding water tank 10.

[0078] The second water pump 62 is installed on the water replenishing pipeline 61 and is used to control the flow rate and pressure of the replenished liquid to ensure that the required liquid can be replenished to the water tank 10 in a timely and stable manner.

[0079] The second water pump 62 is connected to the control unit 70 and can be automatically started and stopped according to the signal of the liquid level detection device 40 to achieve water replenishment on demand.

[0080] By setting up the first conveying device 50 and the second conveying device 60, the system realizes effective control of liquid recovery and replenishment.

[0081] In some embodiments, the reflux pipeline 51 may include fittings such as valves and joints, which are convenient for maintenance and control.

[0082] In some embodiments, the first water pump 52 can be selected from types such as centrifugal pumps and diaphragm pumps according to specific requirements.

[0083] In some embodiments, the second water pump 62 can be selected from centrifugal pumps, booster pumps, etc. according to specific requirements, and the selection depends on the pressure demand and flow requirement of the system.

[0084] In some embodiments, the control unit 70 controls the working processes of the first conveying device 50 and the second conveying device 60 according to the signals from the liquid level detection device 40 as follows:

[0085] The liquid level detection device 40 continuously monitors the liquid level in the water tank 10 and transmits the liquid level information to the control unit 70 in real time; the control unit 70 presets the upper and lower limits of the liquid level in the water tank 10.

[0086] When the liquid level detection device 40 detects that the liquid level is lower than the lower limit:

[0087] The control unit 70 starts the second conveying device 60 to convey the liquid from the external liquid source into the water tank 10 for replenishment;

[0088] At the same time, it stops the reflux operation of the first conveying device 50.

[0089] When the liquid level detection device 40 detects that the liquid level reaches the upper limit:

[0090] The control unit 70 stops the replenishment operation of the second conveying device 60;

[0091] It starts the first conveying device 50 to reflux the liquid in the intermediate storage device 30 back into the water tank 10.

[0092] When the liquid level is within the normal range:

[0093] The control unit 70 can alternately start and stop the first conveying device 50 and the second conveying device 60 as needed to maintain the liquid level within an appropriate range.

[0094] This design realizes the automatic recovery and replenishment of the liquid, ensuring the stability of the liquid level in the water tank 10.

[0095] In one embodiment, the intermediate storage device 30 is a storage tank.

[0096] The storage tank serves as the intermediate storage device 30, mainly for temporarily storing the liquid collected from the collection area 20 and providing a buffer for the liquid to flow back to the water tank 10.

[0097] The recovery pipeline 31 connects the collection area 20 and the storage tank, and is used to transport the liquid flowing down from the workpiece and accumulating in the collection area 20 into the storage tank.

[0098] The return pipeline 51 connects the storage tank and the water tank 10, and is used to transport the liquid in the storage tank back to the corresponding water tank 10 to achieve the recycling of the liquid.

[0099] The storage tank, as the intermediate storage device 30, can balance the time difference between liquid recovery and reuse, and improve the stability of the system.

[0100] In this embodiment, the inlet of the recovery pipeline 31 is set at the lower position of the collection area 20 to facilitate the natural inflow of the liquid into the storage tank. The outlet of the return pipeline 51 is set at the middle and lower part of the storage tank to ensure that the transported liquid is relatively clean and prevent the bottom sediment from entering the water tank 10.

[0101] In some embodiments, a water pump can also be designed on the recovery pipeline 31 to ensure that the liquid flowing down from the workpiece can be quickly and effectively collected into the storage tank, reducing waste.

[0102] In one embodiment, an overflow pipeline 32 is connected to the storage tank. The liquid inlet end of the overflow pipeline 32 communicating with the storage tank is respectively higher than the liquid outlet end of the recovery pipeline 31 and the liquid inlet end of the return pipeline 51. A discharge pipeline 33 is connected to the bottom of the storage tank.

[0103] Specifically, the overflow pipeline 32 is connected to the upper part of the storage tank, and the liquid inlet end of it communicating with the storage tank is higher than the liquid outlet end of the recovery pipeline 31 and the liquid inlet end of the return pipeline 51. When the liquid level in the storage tank rises abnormally, the excess liquid can be discharged through the overflow pipeline 32 to prevent the storage tank from overflowing.

[0104] The liquid outlet end of the recovery pipeline 31 and the liquid inlet end of the return pipeline 51 are both set at positions lower than the liquid inlet end of the overflow pipeline 32. Such a design ensures that the liquid can flow into and out of the tank normally without being affected by the overflow pipeline 32.

[0105] The discharge pipeline 33 is connected to the bottom of the storage tank and is used to regularly discharge the liquid or sediment in the storage tank. When the liquid in the storage tank does not meet the recovery standard, it can be quickly discharged through the discharge pipeline 33.

[0106] In some embodiments, the discharge pipeline 33 is equipped with a valve (not shown in the drawings), which can control the discharge speed and time.

[0107] In one embodiment, the liquid level detection device 40 includes a liquid level sensor.

[0108] The liquid level sensor is installed inside the water tank 10 to ensure that it can cover the entire effective liquid level range of the water tank 10. It should be far away from areas that may cause liquid level fluctuations, such as the water inlet and outlet, to avoid interference.

[0109] The liquid level sensor needs to provide a standardized output signal, such as an analog signal of 4 - 20 mA or 0 - 5 V, etc. The liquid level sensor is used to continuously monitor the liquid level change in the water tank 10 and provide real-time data for the control unit 70.

[0110] When the liquid level reaches the preset high and low limits, the control unit 70 triggers corresponding control actions. For example: when the liquid level is low, start the second water pump 62 for water replenishment; when the liquid level is high, stop the water replenishment operation of the second water pump 62.

[0111] In some embodiments, according to requirements, any of the following types of liquid level sensors can be selected, such as: ultrasonic liquid level sensor: measures the liquid level by emitting and receiving ultrasonic signals; capacitive liquid level sensor: measures the liquid level by utilizing the change in liquid conductivity.

[0112] In some embodiments, the liquid level detection device 40 adopts an ultrasonic liquid level sensor and is installed on the top of the water tank 10. The sensor accurately measures the liquid level height by emitting ultrasonic waves and receiving the reflected waves, and the measurement range covers the entire effective liquid level range of the water tank 10.

[0113] In one embodiment, the control unit 70 adopts a programmable logic controller (PLC). The PLC is an electronic device for digital operation specifically designed for industrial control.

[0114] The PLC receives signals from the liquid level detection device 40 through its input interface. It processes these signals according to the preset control logic and then controls the operation of the first conveying device 50 and the second conveying device 60 through the output interface.

[0115] The program of the PLC can be written and modified according to actual requirements, such as setting different liquid level thresholds to adapt to different production requirements. In addition, the PLC can also be connected to a human - machine interface (HMI) to facilitate operators to monitor the system operation status and adjust parameters.

[0116] By using the PLC as the control unit 70, this system realizes a highly automated liquid recovery and control process, reducing the need for manual operation and the risk of errors.

[0117] In some embodiments, the ultrasonic sensor converts the measured liquid level data into a standard analog signal (such as 4 - 20 mA or 0 - 5 V) for output. The analog signal output by the sensor is transmitted through a cable to the analog input module of the PLC.

[0118] The analog input module of the PLC converts the received analog signal into a digital quantity. The upper and lower limit thresholds of the liquid level are set in the PLC program. According to the preset control logic, the PLC compares the actual liquid level with the set threshold and controls the first water pump 52 or the second water pump 62 accordingly.

[0119] In some embodiments, the first water pump 52 and the second water pump 62 are controlled by frequency converters. The PLC controls the frequency converters through analog output or communicates with the frequency converters through a digital communication interface (such as Modbus).

[0120] As described above, these are only further embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the scope disclosed by the present utility model, according to the technical solution and concept of the present utility model, makes equivalent substitutions or changes, all belong to the protection scope of the present utility model.

Claims

1. A reflux control system, characterized in that, Comprising: At least one water tank (10); A collection area (20), arranged adjacent to the corresponding water tank (10); An intermediate storage device (30), communicating with the water tank (10) and the collection area (20) respectively; A liquid level detection device (40), arranged inside the water tank (10); A first conveying device (50), arranged between the intermediate storage device (30) and the water tank (10), for conveying the liquid in the intermediate storage device (30) to the water tank (10); A second conveying device (60), communicating with the water tank (10), for conveying the liquid from an external liquid source to the water tank (10); A control unit (70), electrically connected to the liquid level detection device (40), the first conveying device (50) and the second conveying device (60) respectively.

2. The reflux control system according to claim 1, wherein There are multiple water tanks (10), and the water tanks (10) include a chemical solution tank (11) and a clean water tank (12).

3. The reflux control system according to claim 2, wherein A first pH detection device (81) is arranged inside the chemical solution tank (11), and the first pH detection device (81) is electrically connected to a chemical adding device (90), and the chemical adding device (90) is used for adding chemicals into the chemical solution tank (11).

4. The reflux control system according to claim 2, wherein The chemical solution tank (11) and the clean water tank (12) are respectively communicated with the intermediate storage device (30); wherein, a second pH detection device (82) is arranged inside the intermediate storage device (30) communicated with the chemical solution tank (11), and a conductivity detection device (100) is arranged inside the intermediate storage device (30) communicated with the clean water tank (12).

5. The reflux control system according to claim 1, characterized in that, The first conveying device (50) includes a reflux pipeline (51) and a first water pump (52) thereon, and the second conveying device (60) includes a water replenishing pipeline (61) and a second water pump (62) thereon.

6. The reflux control system according to claim 5, characterized in that, The intermediate storage device (30) is a storage tank, and the storage tank is communicated with the corresponding collection area (20) through a recovery pipeline (31), and is communicated with the corresponding water tank (10) through the reflux pipeline (51).

7. The reflux control system according to claim 6, wherein An overflow pipeline (32) is connected to the upper part of the storage tank, and a discharge pipeline (33) is connected to the bottom; the height of the liquid inlet end of the overflow pipeline (32) communicating with the storage tank is higher than the liquid outlet end of the recovery pipeline (31) and the liquid inlet end of the reflux pipeline (51) respectively.

8. The reflux control system according to any one of claims 1 to 7, characterized in that, The liquid level detection device (40) includes a liquid level sensor.

9. The reflux control system according to any one of claims 1 to 7, characterized in that, The control unit (70) includes a programmable logic controller.

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