A sewage treatment apparatus

Abstract

This application relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device. The proposed technical solution includes a pair of drain bends connected to the bottom of a wastewater tank. The output ends of the two drain bends are fixedly connected to a collection pipe, which is connected to a water outlet pipe. The output end of the water outlet pipe is connected to a drainage pump. The bottom of the wastewater tank is connected to an oil drain pipe connected to a low-level liquid tank, and a solenoid valve is installed on the oil drain pipe. This application, by installing an oil floatation mechanism and a water floatation assembly inside the wastewater tank, located below the filtration mechanism, first discharges the lower layer of water in the base. After the water is discharged, the oil is automatically discharged under the action of the water floatation assembly. After the oil is discharged, the solenoid valve is closed under the action of the oil floatation mechanism, causing the device to automatically return to its original wastewater treatment state. The entire process involves automatic oil discharge after drainage, eliminating the need to observe the oil level during the oil discharge process, making the wastewater treatment process more convenient.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device. Background Technology

[0002] Kitchen wastewater is a major source of wastewater generated by the catering industry and daily household activities. This wastewater contains grease, food scraps (solid matter), and water. The catering industry, in particular, generates large volumes of wastewater, which requires treatment before discharge. Directly discharging this mixture into the sewer system not only pollutes the environment but also easily clogs the drains. Therefore, wastewater treatment is necessary before discharge. First, food scraps are intercepted and filtered, then oil and water are separated. The separated oil can be recycled for refining biodiesel, and finally, the water is discharged.

[0003] Traditional kitchen wastewater treatment systems consist of a wastewater treatment tank, a solids interceptor plate inside the tank, an oil drain pipe, and a drain pipe. During wastewater treatment, the wastewater is poured into the tank from the top. The solids interceptor plate traps solids in the wastewater, while oil and water flow to the bottom of the tank. When the tank reaches a certain level, the upper layer of oil is first extracted, and then the lower layer of liquid is discharged, preventing direct discharge from clogging the sewer system.

[0004] However, existing kitchen wastewater treatment devices still have the following problems during use: First, because the wastewater level varies each time it is treated, and oil floats on the surface of the water, the insertion height of the oil suction pipe needs to be manually controlled when draining the oil, making it impossible to achieve precise and efficient oil drainage; Second, both oil drainage and water drainage require observation and operation, which wastes manpower; Third, the interceptor filter plate is not easy to disassemble and clean, and it is prone to clogging over time.

[0005] Therefore, this application proposes a wastewater treatment device. Summary of the Invention

[0006] The purpose of this application is to provide a wastewater treatment device in response to the technical problems pointed out in the background art.

[0007] The technical solution of this application: A sewage treatment device, including a base and a sewage tank installed on its upper end, further comprising: A pair of drain bends are connected to the bottom of the sewage tank. The output ends of the two drain bends are fixedly connected to a liquid collection pipe. A water outlet pipe is connected to the liquid collection pipe. The output end of the water outlet pipe is connected to a drain pump. A low-liquid tank is formed on the inner wall of the lower end of the sewage tank. The bottom end of the sewage tank is connected to an oil drain pipe that communicates with the low-liquid tank. A solenoid valve is installed on the oil drain pipe. An oil float mechanism is installed floatingly inside the sewage tank. The oil float mechanism is equipped with a water float component. When the water in the sewage tank is drained, the water float component first locks the drainage and then opens the oil discharge. When the oil in the sewage tank is drained, the oil float mechanism locks the oil discharge. A detachable filter mechanism is installed inside the sewage tank to filter sewage.

[0008] Preferably, the oil bleaching mechanism includes vertical grooves formed on the inner walls of both sides of the sewage tank, and each of the two vertical grooves is slidably connected with a sliding strip, and both vertical grooves are located below the filtration mechanism; An oil float plate is fixedly connected between the two vertical grooves, and the upper end of the oil float plate is an arc-shaped part; A connecting rod is slidably inserted through the middle of the oil float plate. An oil float ball is fixedly connected to the bottom end of the connecting rod, and a limiting plate is fixedly connected to the upper end of the connecting rod. The oil float ball and the low liquid tank are located on the same vertical plane, and the oil float ball and the oil float plate float together above the oil.

[0009] Preferably, the bottom of the sewage tank is provided with a groove a located below the low liquid tank, and a touch sensor A is installed in the groove a. When the oil float comes into contact with the inner wall of the sewage tank, the touch sensor A will be touched.

[0010] Preferably, the lower surface of the oil float plate has a receiving cavity coaxial with the connecting rod, and the inner diameter of the receiving cavity is larger than the diameter of the oil float ball.

[0011] Preferably, the water-floating assembly includes two connecting rods that are slidably inserted through two slide bars, with a water float fixedly connected to the bottom end of each of the two connecting rods, and a limiting piece fixedly connected to the upper end of each of the two connecting rods, with the two water floats floating above the water. The sewage tank has two grooves b at its lower end, which are located directly below two water floats. Each groove b contains a touch sensor B.

[0012] Preferably, the filtration mechanism includes a support frame fixedly connected to the inner wall of the wastewater tank, the support frame being located above the oil skimming mechanism and the water skimming assembly; A partition is fixedly connected to the upper middle part of the support frame. A pair of filter frames are respectively located on both sides of the partition at the upper end of the support frame. Filter plates are embedded at the lower ends of the two filter frames. Liquid guide covers located outside the filter plates are fixedly connected to the lower surface of the filter frames. The lower diameter of the liquid guide covers is smaller than the upper diameter.

[0013] Preferably, a pair of inclined plates are fixedly connected to the inner walls of both filter frames, and the bottom end of the inclined plates extends to the edge of the filter plate. Both filter frames are fixedly connected to side cover plates at their outer ends. The bottom end of the side cover plate extends to the lower edge of the liquid guide cover. The side cover plate covers the side wall of the sewage tank. A handle is fixedly connected to the side wall of the side cover plate.

[0014] Preferably, a cover frame is fixedly connected to the upper inner wall of the base, and an upper cover is provided on the upper end of the cover frame. Two opening and closing cover bodies are provided on the upper cover, and the two opening and closing cover bodies are respectively located above the two filter plates.

[0015] Preferably, the opening and closing cover includes a water inlet at the upper end of the cover, and the upper end of the cover has a sliding groove located on one side of the water inlet, and a sliding cover covering the upper end of the water inlet is slidably connected in the sliding groove.

[0016] Preferably, it also includes a control module, wherein the output terminals of touch sensor A and touch sensor B are electrically connected to the input terminal of the control module, and the output terminal of the control module is electrically connected to the input terminal of the solenoid valve and the drainage pump; After the lower layer of water in the sewage tank is drained, the float ball comes into contact with the inner wall of the sewage tank, and the touch sensor B is sensed and sends an electrical signal to the control module. The control module then shuts down the drain pump and opens the solenoid valve to drain the oil. After the oil in the sewage tank is drained, the oil float comes into contact with the inner wall of the sewage tank, and the touch sensor A is sensed and sends an electrical signal to the control module, which then closes the solenoid valve through the controller module.

[0017] Compared with the prior art, this application has the following beneficial technical effects: This application installs an oil float mechanism and a water float assembly inside the sewage tank, located below the filtration mechanism. First, the lower layer of water in the base is discharged. After the water is discharged, the oil is automatically discharged under the action of the water float assembly. After the oil is discharged, the solenoid valve is closed under the action of the oil float mechanism, so that the device automatically returns to the original sewage treatment state. The entire process automatically discharges oil after drainage. There is no need to observe the oil level during the oil discharge process, making the sewage treatment process more convenient. The oil drain pipe and the drain bend are both connected to the bottom of the sewage tank, and a low liquid trough is opened on the inner wall of the bottom of the sewage tank. The two drain bends are connected to the inner wall of the bottom of the sewage tank, and the oil drain pipe is connected to the inner wall of the low liquid trough. This design allows the water and oil in the kitchen sewage to be completely drained, effectively preventing water or oil residue from remaining on the inner wall of the bottom of the sewage tank. The entire filtration mechanism in this application is easy to disassemble and clean, preventing the filter plate from clogging and affecting the sewage filtration effect. The ingenious design structure makes it difficult for solid stains to remain at the bottom corners of the filtration mechanism, making it easy to clean. Attached Figure Description

[0018] Figure 1This is a three-dimensional diagram of a wastewater treatment device; Figure 2 yes Figure 1 A schematic diagram of the bottom structure; Figure 3 yes Figure 1 Right sectional view of the wastewater tank; Figure 4 This is a schematic diagram of the internal structure of the sewage tank in this application; Figure 5 yes Figure 1 Top sectional view of the wastewater tank; Figure 6 yes Figure 5 Right sectional view; Figure 7 This is a schematic diagram of the oil drift mechanism and water drift assembly in this application; Figure 8 This is a schematic diagram of the connection structure between the sewage tank and the oil drain pipe and the drain bend in this application; Figure 9 yes Figure 8 Enlarged structural diagram at point A in the middle; Figure 10 This is the principle module control diagram of this application.

[0019] Attached reference numerals: 1. Base; 2. Wastewater tank; 3. Top cover; 4. Opening and closing cover; 41. Water inlet; 42. Slide groove; 43. Sliding cover; 5. Filtration mechanism; 51. Support frame; 52. Filter frame; 53. Filter plate; 54. Liquid guide cover; 55. Inclined plate; 56. Side cover plate; 57. Handle; 6. Partition plate; 7. Cover frame; 8. Drain bend; 9. Liquid collection pipe; 10. Water outlet pipe; 11. Low liquid tank; 12. Oil drain pipe; 13. Solenoid valve; 14. Oil float mechanism; 141. Vertical groove; 142. Sliding bar; 143. Oil float plate; 144. Limiting plate 1; 145. Connecting rod 1; 146. Oil float ball; 147. Storage cavity; 148. Touch sensor A; 15. Float assembly; 151. Linkage rod 2; 152. Float ball; 153. Limiting plate 2; 154. Touch sensor B.

[0020] 16. Groove a; 17. Groove b. Detailed Implementation

[0021] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0023] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] like Figures 1-9 As shown, this application discloses a wastewater treatment device, including a base 1 and a wastewater tank 2 mounted on top of it. The bottom of the wastewater tank 2 is raised to maintain a certain distance from the ground to facilitate the discharge of liquid from the bottom of the wastewater tank 2. A liquid level observation window is provided on the side wall of the wastewater tank 2 for observing the liquid level of the filtered wastewater inside the wastewater tank 2. A cover frame 7 is fixedly connected to the upper inner wall of the base 1, and an upper cover 3 is provided on the upper end of the cover frame 7. The upper cover 3 is fixed to the cover frame 7 by bolts. When the equipment inside the wastewater tank 2 needs maintenance, the bolts can be loosened to remove the upper cover 3.

[0027] The upper cover 3 is provided with two opening and closing cover bodies 4. Each opening and closing cover body 4 includes a water inlet 41 opened at the upper end of the upper cover 3. A sliding groove 42 is opened at the upper end of the upper cover 3 on one side of the water inlet 41. A sliding cover 43 covering the upper end of the water inlet 41 is slidably connected in the sliding groove 42. The sliding cover 43 is slidably connected to open and close the water inlet 41 according to the needs of sewage treatment.

[0028] It also includes a pair of drain bends 8 connected to the bottom of the sewage tank 2. A pair of support sleeves are fixedly connected to the side wall of the sewage tank 2 by screws. The two support sleeves are used to support and fix the two drain bends 8. The output ends of the two drain bends 8 are fixedly connected to a liquid collection pipe 9. A water outlet pipe 10 is connected to the liquid collection pipe 9. The output end of the water outlet pipe 10 is connected to a drain pump, which is not shown in the figure. In this application, a low-shear pump is selected for the drain pump, preferably a diaphragm pump. It transports fluid through volume change, has low shear force, and is suitable for water and oil separation scenarios. During the drainage process, the upper layer of oil will not be mixed. As the lower water level decreases, the upper layer of oil will also decrease steadily. A low liquid tank 11 is opened on the lower inner wall of the sewage tank 2. An oil drain pipe 12 connected to the low liquid tank 11 is connected to the bottom of the sewage tank 2. A solenoid valve 13 is installed on the oil drain pipe 12. The purpose of setting up the low liquid tank 11 is that during the oil discharge process, when the oil reaches the lowest liquid level, only a small amount of oil will flow into the low liquid tank 11, making it easier for the remaining oil to be discharged smoothly.

[0029] This embodiment also includes an oil float mechanism 14 floating inside the sewage tank 2. The oil float mechanism 14 is equipped with a water float component 15. When the water in the sewage tank 2 is drained, the water float component 15 first locks the drainage and then opens the oil discharge. When the oil in the sewage tank 2 is drained, the oil float mechanism 14 locks the oil discharge, achieving the effect of automatic connection between drainage and oil discharge. It also effectively solves the problem that traditional sewage treatment devices need to control the position of the oil discharge pipe according to the liquid level, and can accurately separate water and oil.

[0030] Furthermore, it also includes a detachable filter mechanism 5 installed inside the sewage tank 2, through which sewage is filtered. The filter mechanism 5 includes a support frame 51 fixedly connected to the inner wall of the sewage tank 2. The support frame 51 is a rectangular frame, and the support frame 51 is located above the oil floatation mechanism 14 and the water floatation assembly 15. A partition 6 is fixedly connected to the upper middle part of the support frame 51. A pair of filter frames 52 are respectively located on both sides of the partition 6 at the upper end of the support frame 51. The support frame 51 supports the two filter frames 52. The partition 6 separates the two filter frames 52, allowing the two filter frames 52 to be inserted independently from both sides of the sewage tank 2 and stably locked inside the sewage tank 2 after insertion. Filter plates 53 are embedded at the lower ends of the two filter frames 52, and the two opening and closing covers 4 are respectively located above the two filter plates 53. A liquid guide cover 54 located outside the filter plate 53 is fixedly connected to the lower surface of the filter frame 52. The lower diameter of the liquid guide cover 54 is smaller than its upper diameter. The filter frames 52 are designed to concentrate and guide the flow of liquid downwards, preventing the filtered liquid from seeping into the lower corners of the filter frame 52 (which is difficult to clean). The oil-skimming mechanism 14 and the water-skimming assembly 15 are located on one side of the lower port of the liquid guide cover 54, so the liquid will not fall directly onto the upper part of the oil-skimming mechanism 14 when it flows down. A pair of inclined plates 55 are fixedly connected to the inner walls of both filter frames 52. The bottom ends of the inclined plates 55 extend to the edge of the filter plate 53. The two inclined plates 55 can concentrate and guide the flow of wastewater during filtration and also facilitate subsequent cleaning of the filter frames 52, preventing solids from accumulating at the bottom corners of the filter frames 52. It should be noted that the two ends of the inclined plates 55 extend to the inner walls of both sides of the filter frame 52. Both filter frames 52 are fixedly connected to the outer ends of side cover plates 56. The bottom end of the side cover plate 56 extends to the lower edge of the liquid guide cover 54. The side cover plate 56 covers the side wall of the sewage tank 2. The side wall of the side cover plate 56 is fixedly connected to a handle 57.

[0031] Specifically, the oil slinging mechanism 14 includes vertical grooves 141 formed on the inner walls of both sides of the sewage tank 2. Sliding strips 142 are slidably connected to each of the two vertical grooves 141, and both vertical grooves 141 are located below the filter mechanism 5. An oil float plate 143 is fixedly connected between the two vertical grooves 141. The upper end of the oil float plate 143 is arc-shaped, allowing sewage to quickly slide down even if it splashes onto its upper end. A connecting rod 145 is slidably inserted through the middle of the oil float plate 143. An oil float ball 146 is fixedly connected to the bottom end of the connecting rod 145, and a limiting piece 144 is fixedly connected to the upper end of the connecting rod 145. The oil float ball 146 and the low-liquid tank 11 are located on the same vertical plane, and the oil float ball 146 and the oil float plate 143 float together above the oil. The oil float 143 is made of polystyrene foam board, which has a lower density than the upper layer of oil, allowing it to float easily above the oil. The oil float ball 146 is a hollow plastic ball made of polyethylene, with a hollow structure to reduce the overall density and allow it to float above the oil. The bottom of the wastewater tank 2 has a groove a16 located below the low-level tank 11. A touch sensor A148 is installed in the groove a16. When the oil float ball 146 comes into contact with the inner wall of the wastewater tank 2, the touch sensor A148 will be activated. The lower surface of the oil float 143 has a receiving cavity 147 coaxial with the connecting rod 145. The inner diameter of the receiving cavity 147 is larger than the diameter of the oil float ball 146, allowing the oil float ball 146 to be stored inside the receiving cavity 147 when it floats above the oil.

[0032] Furthermore, the water-floating assembly 15 includes connecting rods 151 that are slidably inserted into two sliders 142. The two connecting rods 151 are relatively long (longer than half the depth of the oil, ensuring that the floats 152 can contact the touch sensors B154 when the water is drained). A float 152 is fixedly connected to the bottom end of each connecting rod 151, and a limiting piece 153 is fixedly connected to the top end of each connecting rod 151. Both floats 152 float above the water. Both floats 152 are made of a material with a density greater than oil but less than water (e.g., high-density plastic), and are made into solid spheres so that their density is greater than the density of the upper oil layer but less than the density of the lower water layer, sinking in the oil and floating above the water. The lower end of the wastewater tank 2 has two grooves b17, located directly below the two floats 152. A touch sensor B154 is installed in each of the two grooves b17. During wastewater filtration, both touch sensors B154 and A148 are de-energized, and the gravity generated by the falling wastewater will not trigger touch sensors B154 and A148.

[0033] Combination Figure 10This embodiment also includes a control module. The outputs of touch sensors A148 and B154 are electrically connected to the input of the control module. The output of the control module is electrically connected to the input of solenoid valve 13 and the drain pump. When drainage is required, the device is first powered on, and the drain pump is started. After the lower layer of water in the sewage tank 2 is drained, the float ball 152 contacts the inner wall of the sewage tank 2. Touch sensor B154 is sensed and sends an electrical signal to the control module, which then shuts off the drain pump and opens solenoid valve 13 to drain the oil. This achieves automatic drainage and oil discharge without manual observation. When the oil in the sewage tank 2 is drained, the oil float ball 146 contacts the inner wall of the sewage tank 2. Touch sensor A148 is sensed and sends an electrical signal to the control module, which then closes solenoid valve 13. Finally, the power is disconnected, and the device returns to sewage filtration mode. In this embodiment, a heating plate (not shown in the figure) is installed at the bottom or side wall of the sewage tank 2. The heating plate is connected to a power source and can be activated according to weather conditions to heat the sewage in the sewage tank 2. Because animal oil is prone to solidification in low-temperature environments, the heating temperature is controlled between 40-50°C to ensure that the oil remains liquid and will not damage the equipment inside the sewage tank 2.

[0034] The working principle of this embodiment is as follows: when the device is installed in a designated area, one of the slides 42 is slid to open the inlet 41, and then the sewage is poured into the sewage tank 2 from the inlet 41. When the sewage is poured in, it is intercepted by the filter plate 53, and the solids in the kitchen sewage are intercepted at the top of the filter plate 53; water and oil flow to the bottom of the sewage tank 2 through the liquid guide cover 54.

[0035] When the liquid level in the wastewater tank 2 is about to reach below the liquid guide hood 54, drainage is required. An oil collection tank is placed below the oil drain pipe 12, and the device is then powered on to start the drainage pump. A low-shear pump, such as a diaphragm pump, is used to transport fluids through volume changes. It has low shear force and is suitable for water-oil separation scenarios, preventing the upper layer of oil from mixing during drainage. Water in the wastewater tank 2 enters the collection pipe 9 through two drain bends 8, and is finally discharged to the output end of the drainage pump through the outlet pipe 10, and then discharged through the pipe at the pump's output end. As the water level gradually decreases, the oil level also decreases; the oil float 146 and oil float plate 143 remain floating above the oil, while the two water floats 152 are submerged in the oil and float above the water. After the water in the sewage tank 2 is drained, the two floats 152 will fall to the inner wall of the sewage tank 2 under their own weight and come into contact with the inner wall. At this time, the touch sensor A148 will be touched and send an electrical signal to the control module. The control module will first turn off the drain pump and then open the solenoid valve 13. At this time, the oil inside the sewage tank 2 will be discharged through the oil drain pipe 12. By opening a low liquid tank 11 on the lower inner wall of the sewage tank 2, the oil level will gradually decrease and eventually concentrate in the low liquid tank 11, which will facilitate the complete discharge of the oil. After all the oil in the low liquid tank 11 is drained, the two slide bars 142 slide to the lowest position of the two vertical grooves 141, and the oil float 143 also slides to the lowest position. However, the oil float 143 cannot contact the inner wall of the low liquid tank 11. In this application, through the setting of the oil float ball 146, after all the oil is drained, the oil float ball 146 will contact the inner wall of the low liquid tank 11. At this time, the touch sensor A148 is touched and sends an electrical signal to the control module. The control module closes the solenoid valve 13, so that the device ends the draining, disconnects the power supply of the device, and restores the sewage tank 2 to the filtration state.

[0036] When cleaning solids, pull out two filter frames 52 sequentially from both sides of the wastewater tank 2, empty the solids trapped inside, and then insert the two filter frames 52 back into the wastewater tank 2. The two filter frames 52 are inserted horizontally along the upper end of the support frame 51 until their inner ends abut against the side walls of the partition 6. At this point, the two side covers 56 are respectively placed over the side walls of the wastewater tank 2. The filter plates 53 can be cleaned periodically as needed to ensure the filtration effect of kitchen wastewater and prevent clogging.

[0037] The above specific embodiments are merely preferred embodiments of this application. Based on the technical solutions of this application and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments. The above specific embodiments are merely explanations of this application and are not limitations on this application.

Claims

1. A wastewater treatment device, comprising a base (1) and a wastewater tank (2) mounted on its upper end, characterized in that, Also includes: A pair of drain bends (8) are connected to the bottom of the sewage tank (2). The output ends of the two drain bends (8) are connected to the outlet pipe (10) through the collection pipe (9). The output end of the outlet pipe (10) is connected to the drain pump. A low liquid tank (11) is provided on the inner wall of the lower end of the sewage tank (2). The bottom end of the sewage tank (2) is connected to an oil drain pipe (12) that communicates with the low liquid tank (11). A solenoid valve (13) is provided on the oil drain pipe (12). An oil float mechanism (14) is floating inside the sewage tank (2). A water float assembly (15) is installed on the oil float mechanism (14). When the water in the sewage tank (2) is drained, the water float assembly (15) first closes the drainage and then opens the oil discharge. When the oil in the sewage tank (2) is drained, the oil discharge is closed through the oil float mechanism (14). A detachable filter mechanism (5) is installed inside the sewage tank (2) to filter sewage.

2. The wastewater treatment equipment according to claim 1, characterized in that, The oil bleaching mechanism (14) includes vertical grooves (141) opened on the inner walls of both sides of the sewage tank (2), and slide bars (142) are slidably connected in both vertical grooves (141). Both vertical grooves (141) are located below the filter mechanism (5). An oil float plate (143) is fixedly connected between the two vertical grooves (141), and the upper end of the oil float plate (143) is an arc-shaped part; A connecting rod (145) is slidably inserted through the middle of the oil float plate (143). An oil float ball (146) is fixedly connected to the bottom end of the connecting rod (145). A limiting piece (144) is fixedly connected to the upper end of the connecting rod (145). The oil float ball (146) and the low liquid tank (11) are located on the same vertical plane. The oil float ball (146) and the oil float plate (143) float together above the oil.

3. The wastewater treatment equipment according to claim 2, characterized in that, The bottom of the sewage tank (2) is provided with a groove a (16) located below the low liquid tank (11). A touch sensor A (148) is installed in the groove a (16). When the oil float (146) comes into contact with the inner wall of the sewage tank (2), the touch sensor A (148) will be touched.

4. The wastewater treatment equipment according to claim 2, characterized in that, The lower surface of the oil float plate (143) is provided with a receiving cavity (147) coaxial with the connecting rod (145), and the inner diameter of the receiving cavity (147) is larger than the diameter of the oil float ball (146).

5. A wastewater treatment device according to claim 3, characterized in that, The water float assembly (15) includes connecting rods 2 (151) that are slidably inserted through two sliders (142). The bottom ends of the two connecting rods 2 (151) are fixedly connected to water floats (152), and the upper ends of the two connecting rods 2 (151) are fixedly connected to limit plates 2 (153). The two water floats (152) float above the water. The sewage tank (2) has two grooves b (17) at its lower end. The two grooves b (17) are located directly below the two water floats (152). Touch sensors B (154) are installed in both grooves b (17).

6. A wastewater treatment device according to claim 1 or 5, characterized in that, The filtration mechanism (5) includes a support frame (51) fixedly connected to the inner wall of the sewage tank (2), and the support frame (51) is located above the oil float mechanism (14) and the water float assembly (15). A partition plate (6) is fixedly connected to the upper middle part of the support frame (51). A pair of filter frames (52) are respectively located on both sides of the partition plate (6) at the upper end of the support frame (51). A filter plate (53) is embedded at the lower end of both filter frames (52). A liquid guide cover (54) located outside the filter plate (53) is fixedly connected to the lower surface of the filter frame (52). The lower diameter of the liquid guide cover (54) is smaller than the upper diameter.

7. A wastewater treatment device according to claim 6, characterized in that, The inner walls of both filter frames (52) are fixedly connected with a pair of inclined plates (55), the bottom end of which extends to the edge of the filter plate (53). Both filter frames (52) are fixedly connected to the outer ends of side cover plates (56). The bottom end of the side cover plate (56) extends to the lower edge of the liquid guide cover (54). The side cover plate (56) covers the side wall of the sewage tank (2). The side wall of the side cover plate (56) is fixedly connected to a handle (57).

8. A wastewater treatment device according to claim 6, characterized in that, The upper inner wall of the base (1) is fixedly connected to a cover frame (7), and the upper end of the cover frame (7) is covered with an upper cover (3). The upper cover (3) is provided with two opening and closing cover bodies (4), and the two opening and closing cover bodies (4) are respectively located above the two filter plates (53).

9. A wastewater treatment device according to claim 8, characterized in that, The opening and closing cover (4) includes a water inlet (41) opened at the upper end of the upper cover (3). The upper end of the upper cover (3) is provided with a sliding groove (42) located on one side of the water inlet (41). A sliding cover (43) covering the upper end of the water inlet (41) is slidably connected in the sliding groove (42).

10. A wastewater treatment device according to claim 5, characterized in that, It also includes a control module. The output terminals of touch sensor A (148) and touch sensor B (154) are electrically connected to the input terminal of the control module. The output terminal of the control module is electrically connected to the input terminal of the solenoid valve (13) and the drain pump. When the lower layer of water in the sewage tank (2) is drained, the float ball (152) comes into contact with the inner wall of the sewage tank (2), and the touch sensor B (154) is sensed and generates an electrical signal to the control module. The control module then shuts off the drain pump and opens the solenoid valve (13) to drain the oil. When the oil in the sewage tank (2) is drained, the oil float (146) comes into contact with the inner wall of the sewage tank (2), and the touch sensor A (148) is sensed and sends an electrical signal to the control module, which closes the solenoid valve (13) through the controller module.

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