Domestic wastewater treatment device and wastewater treatment method thereof

Abstract

The present invention relates to the field of wastewater treatment technology, and in particular to a domestic wastewater treatment device and a wastewater treatment method thereof. The technical problems to be solved by the present invention are waste of reagents, clogging of filter screens and incomplete wastewater purification. In order to solve the above technical problems, the present invention provides a domestic wastewater treatment device and a wastewater treatment method thereof. The present invention is composed of an automatic injection mechanism, a multi-stage filtering mechanism and a reflux mechanism. Through the setting of the baffle block and the first solenoid valve, the device can control the feed amount according to the water intake. After the wastewater treatment is completed, the discharge valve can be closed in time to prevent waste of resources. Through the setting of the first filter screen plate and the second filter screen plate, the device can completely filter impurities. The cleaning rod and the dirt collection box can prevent the clogging of the filter screen plate and can facilitate the removal of impurities. Under the action of the second solenoid valve and the water quality sensor, the untreated domestic sewage can be re-entered into the detection box for purification.

Description

Technical Field

[0001] The invention relates to domestic wastewater treatment, in particular to a domestic wastewater treatment device and a wastewater treatment method thereof, belonging to the technical field of wastewater treatment. Background Art

[0002] Domestic wastewater refers to the washing water discharged by residents in their daily lives. In fact, only a small part of the wastewater has been treated, and most of it is directly discharged into rivers without treatment. This practice not only pollutes the ecological environment of the river, but also causes a certain waste of water resources. The pollutant components in the wastewater are extremely complex and diverse, and any treatment method is difficult to achieve the purpose of complete purification. With the development of society, the application of domestic wastewater has become more and more extensive. Therefore, the demand for a domestic wastewater treatment device is growing.

[0003] The existing patent (Announcement No.: CN211141737U) discloses a domestic wastewater treatment device, which relates to the field of wastewater treatment technology. It includes a first treatment chamber, and the left front side, left rear side, right front side and right rear side of the bottom of the first treatment chamber are all provided with first connecting rods. Fine particles in the wastewater are combined with flocculants to form precipitation, and then the first valve is opened, and the filtered wastewater in the upper layer is discharged through the outlet pipe. Finally, the second valve is opened to discharge the sediment through the discharge hopper and the discharge pipe, so as to fully filter the wastewater and improve practicality. In the process of implementing this solution, the inventors found that the following problems in the prior art have not been well solved: 1. The device requires manual addition of detergents and other agents, which increases labor intensity. The discharge valve cannot be closed in time after the domestic wastewater has been filtered, resulting in waste of agents; 2. The device does not filter comprehensively and solid impurities are difficult to discharge. When the filtration time is long, the filter screen is blocked, causing drainage difficulties; 3. The device does not test the water quality when draining water, and incomplete purification may occur during treatment, resulting in a small amount of sewage that is not completely purified and discharged.

[0004] In addition, in the existing device using a filter screen to filter debris, bristles or brush rollers need to be set for cleaning, but the rotary friction scraping can only perform local cleaning, and the dirt adhering to the mesh holes or corners cannot be effectively removed. Summary of the invention

[0005] The object of the present invention is to provide a domestic wastewater treatment device and a wastewater treatment method thereof in order to solve the above-mentioned problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: a domestic wastewater treatment device, including a detection box, an automatic injection mechanism, a multi-stage filtering mechanism and a reflux mechanism.

[0007] A liquid inlet pipe is installed horizontally through one side of the detection box, a liquid discharge pipe is installed horizontally through the other side of the detection box, the automatic injection mechanism is installed on the top surface of the detection box, the multi-stage filtering mechanism is installed inside the detection box, and the reflux mechanism is installed on one side of the detection box.

[0008] The automatic filling mechanism includes a support plate, a sedimentation box, a stirring box, a motor shield and a stirring motor. Two support plates are fixedly installed on the top surface of the detection box, and a sedimentation box and a stirring box are fixedly installed on the corresponding side surfaces of the two support plates respectively. A material lowering barrel is vertically installed through the bottom of the sedimentation box, a linear motor is fixedly installed on the top surface of the detection box, and a blocking block is horizontally fixedly connected to the output end of the linear motor, a motor shield is fixedly installed on the top surface of the stirring box, and a stirring motor is fixedly installed on the top surface of the inner wall of the motor shield, a feed pipe is vertically fixedly installed through the bottom of the stirring box, and a first solenoid valve is fixedly sleeved at the middle of the feed pipe.

[0009] The multi-stage filtering mechanism includes a dirt removal box, a stepper motor, a connecting shaft, a driving gear and a bearing. The top surface of the detection box is fixedly installed with the dirt removal box, and the top surface of the inner wall of the dirt removal box is fixedly installed with the stepper motor. The output end of the stepper motor is rotatably connected with the connecting shaft. There are two connecting shafts, and there are two bearings. The bottom ends of the two connecting shafts are respectively rotatably connected to the bottom of the dirt removal box through corresponding bearings and vertically penetrate the top of the detection box. The outer surfaces of the two connecting shafts are fixedly sleeved with driving gears. The bottom end surface of the inner wall of the dirt removal box is slidably supported by two connecting blocks through a slide groove, and the middle parts of the two connecting blocks are horizontally rotatably connected. There is a screw shaft, both ends of the screw shaft are fixedly sleeved with driven gears, the two driving gears are respectively meshed with corresponding driven gears, the bottom ends of the two connecting shafts are respectively fixedly connected with cleaning rods, a single protrusion is provided on the cleaning rod body, and the protrusion is processed with arc chamfering technology, two limit blocks are fixedly installed on the top end surface and the bottom end surface of the inner wall of the detection box, and buffer springs are fixedly installed on the same side of the four limit blocks, and one end of the four buffer springs is respectively fixedly connected with the first filter screen plate and the second filter screen plate, and two connecting tubes are vertically penetrated through the bottom of the detection box, and the bottoms of the two connecting tubes are respectively threadedly connected to the dirt collecting box.

[0010] A first magnetic block is embedded in the connecting block, a scraper is slidably supported between the top surface and the bottom end of the inner wall of the detection box, a plurality of through holes are arranged on the scraper body, and a second magnetic block is arranged at the top end of the scraper near the inner wall of the detection box, and triangular scraping bodies are arranged on both sides of the bottom end of the scraper body.

[0011] The reflux mechanism includes a water pump, a second solenoid valve, a water suction pipe, a water quality detector and a connecting pipe. The water pump is fixedly installed on one end face of the detection box close to the discharge pipe, the water suction end of the water pump is fixedly sleeved with a water suction pipe, the water outlet end of the water pump is fixedly sleeved with a connecting pipe, one end of the connecting pipe vertically penetrates the top of the detection box and extends into the detection box, the top of the discharge pipe is vertically penetrated with a water quality detector, and the discharge pipe is fixedly sleeved with a second solenoid valve.

[0012] Preferably, the output end of the stirring motor vertically penetrates the bottom of the motor shield and the top of the stirring box and extends into the stirring box, and a stirring paddle is rotatably installed at the output end of the stirring motor.

[0013] Preferably, a single chip microcomputer is fixedly mounted on the top surface of the detection box, and a flow sensor is fixedly sleeved on one end of the liquid inlet pipe.

[0014] Preferably, a material injection port is provided at the top of the sedimentation box, and a liquid injection port is provided at the top of the stirring box.

[0015] Preferably, a threaded hole is provided on the inner wall of the top of the dirt collecting box, and a thread is provided on the outer wall of the bottom of the connecting tube.

[0016] Preferably, sealing rings are provided at the connections between the two connecting shafts and the detection box, and a sealing ring is provided at the connection between the connecting pipe and the detection box.

[0017] Preferably, a slide groove is provided at the middle of the lowering cylinder, and the blocking block is slidably connected in the slide groove of the lowering cylinder.

[0018] Preferably, the four buffer springs are distributed in pairs on both sides of the second filter screen plate, the material lowering cylinder is a square cylinder, and the flow sensor, the first solenoid valve and the linear motor are all electrically connected to the single chip microcomputer.

[0019] Preferably, a mounting groove is provided at the bottom of a support plate close to the sedimentation box, and brushes are fixedly mounted on the outer surfaces of the two first filter screen plates.

[0020] A wastewater treatment method for a domestic wastewater treatment device, the wastewater treatment method comprising the following steps:

[0021] The first step is to conduct the domestic wastewater, add the flocculant into the sedimentation box, add the decontamination agent into the stirring box, and turn on the stirring motor to prevent the agent in the sedimentation box from solidifying. At this time, the domestic wastewater is injected and conducted so that the device can treat the domestic wastewater flowing through.

[0022] The second step is automatic filling. When domestic wastewater flows through the flow sensor, the flow sensor detects the water flow rate and transmits the signal to the lowering barrel. At this time, the lowering barrel controls the linear motor and the first solenoid valve to open. The output shaft of the linear motor drives the blocking block to move to one side from the slide in the lowering barrel, so that the flocculant in the sedimentation box enters the detection box. At the same time, the agent in the decontamination box flows into the detection box. The amount of decontamination agent and flocculant added is controlled according to the water flow rate, which saves resources and prevents waste.

[0023] The third step is multi-stage filtration of impurities. The treated wastewater flows through a multi-stage filtration mechanism, first filtered by the first filter plate, and then filtered by the second filter plate. The filtered solid impurities remain on the first filter plate, and the impurities mixed with the flocculant remain on the second filter plate. When the accumulation amount exceeds a certain level, the impurities push the first filter plate and the second filter plate to move to one side, and at this time the impurities enter the dirt collection box from the connecting cylinder, and the domestic wastewater is subjected to multi-stage filtration.

[0024] The fourth step is the purification and return of water. The filtered wastewater flows through the discharge pipe and is tested by the water quality detector. If the water is completely purified, the second solenoid valve is opened through the single-chip microcomputer. If the water is not completely purified, the second solenoid valve is closed and the water pump is turned on at the same time to return the wastewater from the water pump to the detection box for further treatment and purification, thereby preventing a small amount of sewage from being discharged without purification.

[0025] The fifth step is the cleaning of the device. When the sewage is completely discharged, the single-chip microcomputer controls the linear motor and the first solenoid valve to close and the stepper motor to open. At this time, the output end of the stepper motor drives the connecting shaft to rotate, and the connecting shaft drives the driving gear to rotate. Because the driving gear meshes with the driven gear, the other connecting shaft rotates at the same time, so that the cleaning rod can be driven to scrub the first filter screen plate and the second filter screen plate. The single protrusion arranged on the cleaning rod can ensure that the cleaning rod body touches the first filter screen plate and the second filter screen plate for friction cleaning most of the time, and can also periodically squeeze the two screens, so that the two screens can swing back and forth, so that impurities thereon fall off. In this process, the rotation of the lead screw shaft drives the connecting block to reciprocate back and forth, thereby driving the scraper to reciprocate back and forth through the magnetic adsorption of the first magnetic block and the second magnetic block, so that the inner wall dirt is scraped off and the deposition of impurities is prevented through the triangular scraping blocks on both sides of the bottom of the scraper. After cleaning, the dirt collecting box is removed by thread, the dirt collecting box is poured out, and the impurities in the dirt collecting box are poured out, so that the device is easy to clean.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention includes an automatic injection mechanism. Under the action of the baffle block and the first solenoid valve in the automatic injection mechanism, the device can control the feed amount according to the water intake amount. After the wastewater treatment is completed, the discharge valve can be closed in time to prevent waste of resources, thereby solving the problem that the existing device manually adds decontaminants and other agents, increases labor intensity, and fails to close the discharge valve in time after filtration, resulting in waste of agents;

[0028] 2. The present invention has a multi-stage filtering mechanism. Under the action of the first filter screen plate and the second filter screen plate in the multi-stage filtering mechanism, the device can completely filter impurities. The cleaning rod and the dirt collecting box can prevent the filter screen plate from being blocked and can conveniently remove impurities, thereby solving the problem of the existing device causing the filter screen to be blocked and causing drainage difficulties when the filtering time is long;

[0029] 3. The present invention includes a reflux mechanism. Under the action of the second solenoid valve and the water quality sensor in the reflux mechanism, the untreated domestic sewage is re-entered into the detection box for purification, thereby preventing the problem of a small amount of sewage being discharged without being completely purified in the existing device.

[0030] 4. In the present invention, the cleaning rod with a single protrusion can not only ensure friction and scraping, but also periodically push the filter screen to move back and forth, so that the dirt thereon can be shaken off. In addition, a scraper with double triangular scrapers at the bottom cooperates with the combined structure of the lead screw transmission motion and the magnetic adsorption transmission motion, so that the fallen and deposited dirt can be cleaned timely and periodically. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0034] Figure 3 It is a cross-sectional structural schematic diagram of the multi-stage filtering mechanism of the present invention;

[0035] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0036] In the figure: 1. detection box; 2. liquid inlet pipe; 3. liquid discharge pipe; 4. support plate; 5. sedimentation box; 6. stirring box; 7. motor shield; 8. stirring motor; 9. single chip microcomputer; 10. linear motor; 11. block; 12. material lowering barrel; 13. material delivery pipe; 14. first solenoid valve; 15. dirt removal box; 16. stepping motor; 17. connecting shaft; 18. driving gear; 19. driven gear; 20. connecting block; 21. screw shaft; 22. bearing; 23. first filter screen; 24. cleaning rod; 25. second filter screen; 26. buffer spring; 27. limit block; 28. connecting barrel; 29. ​​dirt collection box; 30. water pump; 31. second solenoid valve; 32. water pumping pipe; 33. water quality detector; 34. connecting pipe; 35. flow sensor; 36. stirring paddle. DETAILED DESCRIPTION

[0037] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0039] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] See also Figure 1-4 As shown, a domestic wastewater treatment device includes a detection box 1, an automatic injection mechanism, a multi-stage filtering mechanism and a reflux mechanism.

[0041] A liquid inlet pipe 2 is installed horizontally through one side of the detection box 1, and a liquid discharge pipe 3 is installed horizontally through the other side of the detection box 1. The automatic injection mechanism is installed on the top surface of the detection box 1, the multi-stage filtering mechanism is installed inside the detection box 1, and the reflux mechanism is installed on one side of the detection box 1.

[0042] The automatic filling mechanism includes a support plate 4, a sedimentation box 5, a stirring box 6, a motor shield 7 and a stirring motor 8. Two support plates 4 are fixedly installed on the top surface of the detection box 1, and the sedimentation box 5 and the stirring box 6 are fixedly installed on the corresponding side surfaces of the two support plates 4 respectively. A material lowering barrel 12 is vertically penetrated through the bottom of the sedimentation box 5, a linear motor 10 is fixedly installed on the top surface of the detection box 1, and a blocking block 11 is horizontally fixedly connected to the output end of the linear motor 10, a motor shield 7 is fixedly installed on the top surface of the stirring box 6, and a stirring motor 8 is fixedly installed on the top surface of the inner wall of the motor shield 7, a feed pipe 13 is vertically fixedly penetrated through the bottom of the stirring box 6, and a first solenoid valve 14 is fixedly sleeved at the middle of the feed pipe 13.

[0043] The multi-stage filtering mechanism includes a dirt removal box 15, a stepper motor 16, a connecting shaft 17, a driving gear 18 and a bearing 22. The dirt removal box 15 is fixedly installed on the top surface of the detection box 1, and the stepper motor 16 is fixedly installed on the top surface of the inner wall of the dirt removal box 15. The output end of the stepper motor 16 is rotatably connected with the connecting shaft 17. There are two connecting shafts 17, and there are two bearings 22. The bottom ends of the two connecting shafts 17 are respectively rotatably connected to the bottom of the dirt removal box 15 through corresponding bearings 22 and vertically penetrate the top of the detection box 1. The outer surfaces of the two connecting shafts 17 are fixedly sleeved with driving gears 18. The bottom end surface of the inner wall of the dirt removal box 15 is slidably supported by two connecting blocks 20 through a slide groove. The middle parts of the two connecting blocks 20 are horizontally rotatably connected with a lead screw shaft 21. The lead screw shaft 21 Both ends of the detection box 1 are fixedly sleeved with driven gears 19, and the two driving gears 18 are respectively meshed with the corresponding driven gears 19. The bottom ends of the two connecting shafts 17 are respectively fixedly connected with cleaning rods 24, and a single protrusion is provided on the rod body of the cleaning rod 24, and the protrusion is processed with an arc chamfering process. Two limit blocks 27 are fixedly installed on the top end surface and the bottom end surface of the inner wall of the detection box 1, and a buffer spring 26 is fixedly installed on the same side of the four limit blocks 27. One end of the four buffer springs 26 is respectively fixedly connected with the first filter screen plate 23 and the second filter screen plate 25. Two connecting tubes 28 are vertically penetrated through the bottom of the detection box 1, and the bottoms of the two connecting tubes 28 are respectively threadedly connected to the dirt collecting box 29.

[0044] A first magnetic block is embedded in the connecting block 20, and a scraper is slidably supported between the top surface and the bottom end of the inner wall of the detection box 1. A plurality of through holes are arranged on the scraper body, and a second magnetic block is arranged at the top of the scraper near the inner wall of the detection box 1. Triangular scraping bodies are arranged on both sides of the bottom end of the scraper body.

[0045] The reflux mechanism includes a water pump 30, a second solenoid valve 31, a water suction pipe 32, a water quality detector 33 and a connecting pipe 34. The water pump 30 is fixedly installed on one end face of the detection box 1 close to the discharge pipe 3, the water suction end of the water pump 30 is fixedly sleeved with the water suction pipe 32, and the water outlet end of the water pump 30 is fixedly sleeved with the connecting pipe 34, one end of the connecting pipe 34 vertically penetrates the top of the detection box 1 and extends into the detection box 1, the water quality detector 33 is vertically penetrated and installed on the top of the discharge pipe 3, and the second solenoid valve 31 is fixedly sleeved on the discharge pipe 3.

[0046] Specifically, the output end of the stirring motor 8 vertically penetrates the bottom of the motor shield 7 and the top of the stirring box 6 and extends into the stirring box 6. The output end of the stirring motor 8 is rotatably mounted with a stirring paddle 36.

[0047] Specifically, a single chip computer 9 is fixedly mounted on the top surface of the detection box 1 , and a flow sensor 35 is fixedly sleeved on one end of the liquid inlet pipe 2 .

[0048] Specifically, a material injection port is provided at the top of the sedimentation box 5 , and a liquid injection port is provided at the top of the stirring box 6 .

[0049] Specifically, a threaded hole is formed on the inner wall of the top of the dirt collecting box 29, and a thread is formed on the outer wall of the bottom of the connecting tube 28.

[0050] Specifically, sealing rings are provided at the connection points between the two connecting shafts 17 and the detection box 1 , and a sealing ring is provided at the connection point between the connecting pipe 34 and the detection box 1 .

[0051] Specifically, a slide groove is provided at the middle of the material lowering cylinder 12 , and the stopper block 11 is slidably connected in the slide groove of the material lowering cylinder 12 .

[0052] Specifically, the four buffer springs 26 are distributed in pairs on both sides of the second filter screen plate 25 , the material lowering cylinder 12 is a square cylinder, and the flow sensor 35 , the first solenoid valve 14 and the linear motor 10 are all electrically connected to the single chip microcomputer 9 .

[0053] Specifically, a mounting groove is provided at the bottom of a support plate 4 close to the sedimentation box 5 , and brushes are fixedly mounted on the outer surfaces of the two first filter screen plates 23 .

[0054] A wastewater treatment method for a domestic wastewater treatment device, the wastewater treatment method comprising the following steps:

[0055] The first step is to conduct the domestic wastewater, add the flocculant into the sedimentation box 5, add the decontamination agent into the stirring box 6, and turn on the stirring motor 8 to prevent the agent in the sedimentation box 5 from solidifying. At this time, the domestic wastewater is injected and conducted so that the device can treat the domestic wastewater flowing through.

[0056] The second step is automatic filling. When domestic wastewater flows through the flow sensor 35, the flow sensor 35 detects the water flow rate and transmits the signal to the lowering cylinder 12. At this time, the lowering cylinder 12 controls the linear motor 10 and the first solenoid valve 14 to run and open. The output shaft of the linear motor 10 drives the blocking block 11 to move to one side from the slide groove in the lowering cylinder 12, so that the flocculant in the sedimentation box 5 enters the detection box 1. At the same time, the agent in the decontamination box 15 flows into the detection box 1. The amount of decontamination agent and flocculant added is controlled according to the water flow rate, which saves resources and prevents waste.

[0057] The third step is multi-stage filtration of impurities. The treated wastewater flows through a multi-stage filtration mechanism, first filtered by the first filter screen 23, and then filtered by the second filter screen 25. The filtered solid impurities remain on the first filter screen 23, and the impurities mixed with the flocculant remain on the second filter screen 25. When the accumulation amount exceeds a certain level, the impurities push the first filter screen 23 and the second filter screen 25 to move to one side, and at this time the impurities enter the dirt collection box 29 from the connecting tube 28, and the domestic wastewater is subjected to multi-stage filtration.

[0058] The fourth step is to reflux the purified water. The filtered wastewater flows through the drain pipe 3 and is detected by the water quality detector 33. If the water is completely purified, the second solenoid valve 31 is opened by the single-chip microcomputer 9. If the water is not completely purified, the second solenoid valve 31 is closed and the water pump 30 is turned on at the same time, and the wastewater is refluxed from the water pump 30 to the detection box 1 for further treatment and purification, thereby preventing a small amount of sewage from being discharged without purification.

[0059] The fifth step is to clean the device. After the sewage is completely discharged, the single chip microcomputer 9 controls the linear motor 10 and the first solenoid valve 14 to close and open the stepper motor 16. At this time, the output end of the stepper motor 16 drives the connecting shaft 17 to rotate, and the connecting shaft 17 drives the driving gear 18 to rotate. Because the driving gear 18 engages the driven gear 19, the other connecting shaft 17 rotates at the same time, so that the cleaning rod 24 can be driven to brush the first filter screen 23 and the second filter screen 25. The single protrusion arranged on the cleaning rod 24 ensures that the rod body of the cleaning rod 24 touches the first filter screen 23 and the second filter screen 25 for friction cleaning most of the time. At the same time, the two mesh plates can be squeezed periodically so that the two mesh plates can swing back and forth to make impurities fall off. During this process, the rotation of the screw shaft 21 drives the connecting block 20 to reciprocate back and forth, thereby driving the scraper to reciprocate back and forth through the magnetic adsorption of the first magnetic block and the second magnetic block, thereby scraping off the dirt on the inner wall and preventing the deposition of fallen impurities through the triangular scraping blocks on both sides of the bottom of the scraper. After cleaning, the dirt collecting box 29 is removed by thread, and the dirt collecting box 29 is poured out, and the impurities in the dirt collecting box 29 are poured out, so that the device is easy to clean.

[0060] The electrical components appearing in this application document are all externally connected to a power source and a control switch when in use. The circuits, electronic components and control modules involved are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to software and methods.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0062] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A domestic wastewater treatment device, characterized in that: It comprises a detection box (1), an automatic material injection mechanism, a multi-stage filtering mechanism and a reflux mechanism; A liquid inlet pipe (2) is installed horizontally through one side of the detection box (1), a liquid discharge pipe (3) is installed horizontally through the other side of the detection box (1), the automatic injection mechanism is installed on the top surface of the detection box (1), the multi-stage filtering mechanism is installed inside the detection box (1), and the reflux mechanism is installed on a side surface of the detection box (1); The automatic injection mechanism comprises a support plate (4), a deposition box (5), a stirring box (6), a motor shield (7) and a stirring motor (8); two support plates (4) are fixedly installed on the top surface of the detection box (1); a deposition box (5) and a stirring box (6) are fixedly installed on the corresponding side surfaces of the two support plates (4); a material lowering cylinder (12) is vertically installed through the bottom of the deposition box (5); a linear motor (10) is fixedly installed on the top surface of the detection box (1); a baffle block (11) is horizontally fixedly connected to the output end of the linear motor (10); a motor shield (7) is fixedly installed on the top surface of the stirring box (6); a stirring motor (8) is fixedly installed on the top surface of the inner wall of the motor shield (7); a feed pipe (13) is vertically fixedly installed through the bottom of the stirring box (6); a first solenoid valve (14) is fixedly sleeved at the middle of the feed pipe (13); The multi-stage filtering mechanism comprises a dirt removal box (15), a bidirectional rotating stepping motor (16), a connecting shaft (17), a driving gear (18) and a bearing (22); the dirt removal box (15) is fixedly mounted on the top surface of the detection box (1); the bidirectional rotating stepping motor (16) is fixedly mounted on the top surface of the inner wall of the dirt removal box (15); the output end of the bidirectional rotating stepping motor (16) is rotatably connected to the connecting shaft (17); the number of the connecting shafts (17) is two; the bearing (22) The number of the connecting shafts (22) is two, and the bottom ends of the two connecting shafts (17) are rotatably connected to the bottom of the dirt removal box (15) through corresponding bearings (22) and vertically penetrate the top of the detection box (1). The outer surfaces of the two connecting shafts (17) are fixedly sleeved with driving gears (18). The bottom end surface of the inner wall of the dirt removal box (15) is slidably supported by two connecting blocks (20) through a slide groove. The middle parts of the two connecting blocks (20) are horizontally rotatably connected with a lead screw shaft (21). The lead screw shaft (21) is connected to the bottom end surface of the inner wall of the dirt removal box (15). Both ends of the lever shaft (21) are fixedly sleeved with driven gears (19), the two driving gears (18) are respectively meshed with the corresponding driven gears (19), the bottom ends of the two connecting shafts (17) are respectively fixedly connected with cleaning rods (24), the cleaning rod (24) is provided with a single convex block on the rod body, and the convex block is processed with arc chamfering, the top end surface and the bottom end surface of the inner wall of the detection box (1) are fixedly installed with two limit blocks (27), and the same side surface of the four limit blocks (27) A buffer spring (26) is fixedly installed on each of the four buffer springs (26), one end of each of the four buffer springs (26) being fixedly connected to a first filter screen plate (23) and a second filter screen plate (25), two connecting tubes (28) are vertically installed through the bottom of the detection box (1), the bottoms of the two connecting tubes (28) are respectively threadedly connected to a dirt collection box (29), a single chip computer (9) is fixedly installed on the top surface of the detection box (1), and a flow sensor (35) is fixedly sleeved on one end of the liquid inlet pipe (2); A first magnetic block is embedded in the connecting block (20); a scraper is slidably supported between the top surface and the bottom end of the inner wall of the detection box (1); a plurality of through holes are provided on the scraper body; a second magnetic block is provided at the top of the scraper near the inner wall of the detection box (1); and triangular scraping bodies are provided on both sides of the bottom end of the scraper body; The reflux mechanism comprises a water pump (30), a second solenoid valve (31), a water suction pipe (32), a water quality detector (33) and a connecting pipe (34); the water pump (30) is fixedly installed on one end surface of the detection box (1) close to the discharge pipe (3); the water suction end of the water pump (30) is fixedly sleeved with the water suction pipe (32); the water outlet end of the water pump (30) is fixedly sleeved with the connecting pipe (34); one end of the connecting pipe (34) vertically penetrates the top of the detection box (1) and extends into the detection box (1); the water quality detector (33) is vertically penetrated and installed on the top of the discharge pipe (3); and the second solenoid valve (31) is fixedly sleeved on the discharge pipe (3).

2. A domestic wastewater treatment device according to claim 1, characterized in that: The output end of the stirring motor (8) vertically penetrates the bottom of the motor shield (7) and the top of the stirring box (6) and extends into the stirring box (6). A stirring paddle (36) is rotatably mounted on the output end of the stirring motor (8).

3. A domestic wastewater treatment device according to claim 1, characterized in that: The top of the sedimentation box (5) is provided with a material injection port, and the top of the stirring box (6) is provided with a liquid injection port.

4. A domestic wastewater treatment device according to claim 1, characterized in that: The inner wall of the top of the dirt collecting box (29) is provided with a threaded hole, and the outer wall of the bottom of the connecting tube (28) is provided with a thread.

5. A domestic wastewater treatment device according to claim 1, characterized in that: The connection points between the two connecting shafts (17) and the detection box (1) are both provided with sealing rings, and the connection point between the connecting pipe (34) and the detection box (1) is provided with a sealing ring.

6. A domestic wastewater treatment device according to claim 1, characterized in that: A sliding groove is provided at the middle of the material lowering cylinder (12), and the stopper block (11) is slidably connected in the sliding groove of the material lowering cylinder (12).

7. A domestic wastewater treatment device according to claim 1, characterized in that: The four buffer springs (26) are distributed in pairs on both sides of the second filter screen plate (25); the material lowering cylinder (12) is a square cylinder; the flow sensor (35), the first solenoid valve (14) and the linear motor (10) are all electrically connected to the single chip computer (9).

8. A domestic wastewater treatment device according to claim 1, characterized in that: A mounting groove is provided at the bottom of a support plate (4) close to the sedimentation box (5), and brushes are fixedly mounted on the outer surfaces of the two first filter screen plates (23).

9. A wastewater treatment method for a domestic wastewater treatment device according to any one of claims 1 to 8, characterized in that: The wastewater treatment method comprises the following steps: The first step is to conduct the domestic wastewater, add the flocculant into the sedimentation box (5), add the decontamination agent into the stirring box (6), and turn on the stirring motor (8) to prevent the agent in the sedimentation box (5) from solidifying. At this time, the domestic wastewater is then injected and conducted, so that the device can treat the domestic wastewater flowing through. The second step is automatic injection. When the domestic wastewater flows through the flow sensor (35), the flow sensor (35) detects the water flow rate and transmits the signal to the material lowering cylinder (12). At this time, the single chip microcomputer (9) controls the linear motor (10) and the first electromagnetic valve (14) to operate and open. The output shaft of the linear motor (10) drives the blocking block (11) to move from the slide groove in the material lowering cylinder (12) to one side, so that the flocculant in the sedimentation box (5) enters the detection box (1). At the same time, the agent in the decontamination box (15) flows into the detection box (1). The amount of decontamination agent and flocculant added is controlled according to the water flow rate, thereby saving resources and preventing waste. The third step is multi-stage filtration of impurities. The treated wastewater flows through the multi-stage filtration mechanism, first filtered by the first filter screen (23), and then filtered by the second filter screen (25). The filtered solid impurities remain on the first filter screen (23), while the impurities mixed with the flocculant remain on the second filter screen (25). When the accumulation exceeds a certain level, the impurities push the first filter screen (23) and the second filter screen (25) to move to one side, and at this time the impurities enter the dirt collection box (29) from the connecting tube (28), and the domestic wastewater is multi-stage filtered. The fourth step is to purify and return the water. The filtered wastewater flows through the drainage pipe (3) and is detected by the water quality detector (33). If the water quality is completely purified, the second solenoid valve (31) is opened through the single chip microcomputer (9). If the water quality is not completely purified, the second solenoid valve (31) is closed and the water pump (30) is turned on at the same time. The wastewater is returned from the water pump (30) to the detection box (1) for further treatment and purification, thereby preventing a small amount of sewage from being discharged without being purified. The fifth step is cleaning the device. When the sewage is completely discharged, the single chip microcomputer (9) controls the linear motor (10) and the first electromagnetic valve (14) to close, and turns on the bidirectional rotating stepping motor (16) to periodically reciprocate. At this time, the output end of the bidirectional rotating stepping motor (16) drives the connecting shaft (17) to rotate, and the connecting shaft (17) drives the driving gear (18) to rotate. Because the driving gear (18) engages with the driven gear (19), the other connecting shaft (17) rotates at the same time, thereby driving the cleaning rod (24) to brush the first filter screen plate (23) and the second filter screen plate (25). The single protrusion provided on the cleaning rod (24) ensures that the cleaning rod (24) is large. At some point in time, the cleaning rod (24) contacts the first filter screen (23) and the second filter screen (25) for friction cleaning and can also periodically squeeze the two screens, so that the two screens can swing back and forth, causing impurities thereon to fall off. During this process, the rotation of the lead screw shaft (21) drives the connecting block (20) to reciprocate back and forth, thereby driving the scraper to reciprocate back and forth through the magnetic adsorption of the first magnetic block and the second magnetic block, thereby scraping off the dirt on the inner wall and preventing the deposition of impurities through the triangular scraping blocks on both sides of the bottom of the scraper. After cleaning is completed, the dirt collecting box (29) is removed by threading, and the impurities in the dirt collecting box (29) are poured out, so that the device is easy to clean.

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