Sewage filtering system and cleaning and sewage suction truck

Abstract

The invention relates to the technical field of cleaning and sewage suction trucks for environmental sanitation cleaning, in particular to a sewage filtering system and a cleaning and sewage suction truck. The system comprises a sewage tank, wherein the sewage tank comprises a tank door; the primary filtering device is arranged in the sewage tank and comprises a buoy hinged to the sewage tank, a driving mechanism fixedly connected with the buoy and a first filtering net barrel in transmission connection with the first driving mechanism, and the first driving mechanism is used for driving the first filtering net barrel to rotate; the clean water tank is communicated with a first water pump, and the first water pump is communicated with the interior of the first filter screen barrel. The buoy is hinged to the sewage tank and floats according to the liquid level in the tank to drive the first filter screen barrel to float, and the problems that a sewage filtering inlet of an existing sewage filtering system is fixedly arranged too high and cannot filter sewage, and the sewage filtering inlet is arranged too low and is easily blocked by impurities can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning sewage suction vehicles for sanitation cleaning, and in particular to a sewage filtering system and a cleaning sewage suction vehicle. Background Art

[0002] As a type of sanitation vehicle, the sewer cleaning and suction truck has the functions of flushing sewers, sucking sludge, and achieving timely dredging of sewers. It is an important equipment for urban environmental protection and construction. Conventional sewage suction trucks do not have a sewage filtration system. After the stored clean water is used up, they need to go back and forth to the water filling station to add water, which is inefficient; the sewage tanks of a few sewage cleaning and suction trucks are equipped with a sewage filtration system, but the sewage filtration inlet of the sewage filtration system is relatively fixed on the sewage tank. There are many impurities at the bottom of the sewage. When the sewage filtration inlet is set too high, the filtration cannot be performed when the liquid level in the sewage tank is low. When the sewage filtration inlet is set too low, it is easy to be blocked by heavier impurities in the sewage, which is inconvenient and impractical. Summary of the invention

[0003] The main purpose of the present invention is to solve the problem that the fixed arrangement of the sewage filter inlet of the existing sewage filter system causes inconvenience in use, and to provide a sewage filter system and a sewage cleaning and suction truck.

[0004] The technical solution adopted by the present invention is: a sewage filtration system, the system comprising:

[0005] A sewage tank, wherein the sewage tank comprises a tank door;

[0006] A primary filtering device, the primary filtering device is arranged in the sewage tank, comprising a buoy hinged on the sewage tank, a driving mechanism fixedly connected to the buoy, and a first filter screen barrel drivingly connected to the first driving mechanism, the first driving mechanism is used to drive the first filter screen barrel to rotate;

[0007] A clean water tank is connected to a first water pump, and the first water pump is connected to a first filter barrel.

[0008] Furthermore, the sewage tank and the clean water tank are integrated into the same double-cavity tank body, and a sealing partition is slidably provided in the double-cavity tank body, which separates the double-cavity tank body into two chambers, which are used as the sewage tank and the clean water tank respectively.

[0009] Furthermore, the primary filtering device also includes a flushing mechanism for flushing the inner wall of the first filter screen barrel; the flushing mechanism includes a flushing pipe arranged in the first filter screen barrel; and a flushing hole is provided on the flushing pipe.

[0010] Furthermore, it also includes a limiting mechanism, which is arranged on the primary filtering device and is used to abut the sewage tank to limit the rotation angle of the float when the float rotates around the hinge.

[0011] Furthermore, the limiting mechanism comprises limiting support rods, which are respectively arranged on the upper and lower sides of the buoy and are used to abut against the sewage tank to limit the rotation angle of the buoy when the buoy rotates around the hinge.

[0012] Furthermore, it also includes a buffer mechanism, which includes a tension spring with the top end fixedly connected to the sewage tank and the bottom end fixedly connected to the float; a mounting pipe is provided on the tank door, one end of the mounting pipe is connected to the first water pump, and the other end is rotatably provided with a transfer pipe, the float is hinged on the mounting pipe, and the transfer pipe is connected to the first filter barrel.

[0013] Furthermore, it also includes a secondary filtering device arranged on the output pipeline of the primary filtering device, the secondary filtering device includes a cyclone separator whose top and bottom ends are respectively connected to the clean water tank and the sewage tank, and the water inlet pipeline of the cyclone separator is connected to the first filter screen barrel, which is used to form a spiral water flow to discharge heavier impurities into the sewage tank and discharge the upper water into the clean water tank.

[0014] Furthermore, the cyclone separator includes a water inlet pipe and a conical tube with a large top and a small bottom. The water inlet pipe is connected to the tube wall of the large end of the conical tube and is tangent to the tube wall of the large end to form a cyclone; the top and bottom ends of the conical tube are respectively connected to the clean water tank and the sewage tank; the outlet of the conical tube connected to the clean water tank is lower than the water inlet pipe.

[0015] Furthermore, a water outlet pipe is provided on the top pipe of the conical pipe, one end of the water outlet pipe is connected to the clean water tank, and the other end is inserted into the conical pipe and is located below the water inlet pipe.

[0016] Furthermore, the conical tube comprises a large-head conical tube, a small-head conical tube detachably arranged on the large-head conical tube, and a cover cap arranged on the large-head end of the large-head conical tube; the water inlet pipe and the water outlet pipe are arranged on the cover cap.

[0017] Furthermore, it also includes a three-stage filtering device arranged in the clean water tank, the three-stage filtering device includes a mounting frame and a second filter screen barrel rotatably arranged on the mounting frame, a second water pump connected to the second filter screen barrel by a pipeline, and a second driving mechanism transmission-connected to the second filter screen barrel, the second driving mechanism is used to drive the second filter screen barrel to rotate.

[0018] Furthermore, a scraper is fixedly provided on the mounting frame for scraping off impurities attached to the outer wall of the second filter screen barrel; a nozzle is also provided on the mounting frame, and a water spray port is provided on the nozzle for flushing the outer wall of the second filter screen barrel; the second filter screen barrel is connected to the outside of the clean water tank through a connecting pipe.

[0019] Furthermore, it also includes a four-stage filtering device whose water inlet is connected to the second filter screen barrel; the four-stage filtering device includes a liquid storage barrel connected to the second filter screen barrel, a third filter screen barrel arranged in the liquid storage barrel, and a water outlet arranged on the liquid storage barrel and connected to the third filter screen barrel, and the second water pump is arranged on the water outlet of the third filter screen barrel for discharging water filtered by the third filter screen barrel.

[0020] Another aspect of the present invention provides a sewage cleaning and suction vehicle, comprising the sewage filtration system provided by the present invention, a sewage suction pump arranged on the sewage tank and a drum assembly connected to the first filter screen barrel; the drum assembly comprises a reel and a hose arranged on the reel.

[0021] The beneficial effects of the present invention include: 1. The float is hinged on the sewage tank and can rotate around the hinge. When the liquid level in the sewage tank changes, the float drives the first filter screen barrel to float. The first driving mechanism drives the first filter screen barrel to rotate, so that the first filter screen barrel is not easily blocked by heavier impurities at the bottom. The first water pump pipeline is connected to the first filter screen barrel and the filtered first water can be pumped into the clean water tank for use; when there are many impurities in the sewage tank, the tank door can be opened to clean the impurities; the first filter screen barrel can rotate and float with the float, which can solve the problem that the conventional sewage filter inlet is fixed and inconvenient and impractical;

[0022] 2. The clean water tank and the sewage tank of the present invention are integrated into the same tank body and separated by a sealing partition. The sealing partition can be slidably adjusted to adjust the volume of the clean water tank and the sewage tank, so as to increase the maximum volume of the clean water tank when taking water and storing clean water before operation;

[0023] 3. The flushing mechanism of the present invention has a simple structure. The wall of the first filter screen barrel can be flushed through the flushing pipe and its flushing hole to prevent impurities from clogging the filter screen holes of the first filter screen barrel.

[0024] 4. The limit mechanism can limit the rotation angle of the float around the hinge, which can prevent the primary filter device from being damaged by falling on the sewage tank due to a sudden drop in the liquid level when the tank door is opened;

[0025] 5. The buffer mechanism can slow down the speed of the float and filter barrel rotating and falling around the hinge to prevent them from falling on the sewage tank; the primary filter device is hinged to the tank door through the installation pipe, and moves with the tank door when the tank door is opened, making it convenient to clean the impurities in the sewage tank after opening the tank door;

[0026] 6. Secondary filtration can be performed through the secondary filtration device. The spiral water flow formed by the cyclone separator discharges the heavier impurities in the lower layer into the sewage tank and the upper water into the clean water tank, further improving the filtration effect and forming a circulating filtration;

[0027] 7. The cyclone separator of the present invention has a simple structure. The water inlet pipe is connected to the conical pipe and is tangent to the wall of the conical pipe, so that the water flows into the conical pipe to form a spiral water flow. The lower layer of heavier impurities in the water is discharged into the sewage tank for circulation filtration, and the upper layer of clean water can be discharged into the clean water tank for standby use.

[0028] 8. The three-stage filtration device can perform three filtrations to further improve the filtration effect of sewage;

[0029] 9. The scraper can be used to remove impurities attached to the outside of the second filter screen barrel; the spray pipe can be used to rinse the second filter screen barrel and dredge the clogged filter screen holes;

[0030] 10. The cleaning sewage suction vehicle of the present invention can use the clean water stored in the clean water tank to flush and clear the sewer, and the sewage in the sewer is sucked out by the sewage suction pump, and then filtered by the sewage filtration system and recycled, which can improve the water utilization rate, avoid the need to go back and forth to the water filling station to add water after the water stored in the clean water tank is used up, resulting in a waste of time, thereby improving work efficiency.

[0031] The sewage filtering system involved in the present invention is hinged on the sewage tank by a float and floats according to the liquid level in the tank, thereby driving the first filter screen barrel to float, which can solve the problem that the sewage filter inlet of the existing sewage filtering system is fixed too high and cannot filter sewage, and is easily blocked by impurities if it is set too low. The first filter screen barrel is driven to rotate by the first driving mechanism, which can effectively avoid the clogging of the filter mesh holes of the first filter screen barrel; the overall structure is simple, easy to use, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : Structural schematic diagram of sewage filtration system;

[0033] Figure 2 : A schematic diagram of the structure of the primary filtration device;

[0034] Figure 3 : A schematic diagram of the structure in which the primary filtering device is arranged on the tank door;

[0035] Figure 4 : A schematic diagram of the structure of the secondary filtration device;

[0036] Figure 5 : Schematic diagram of the decomposed structure of the conical tube;

[0037] Figure 6 : A schematic diagram of the structure of a three-stage filtration device;

[0038] Figure 7 : A schematic diagram of the structure of a four-stage filtration device;

[0039] Among them: 1-double-chamber tank body; 11-waste water tank; 12-clean water tank; 13-sealed partition; 14-tank door; 2-primary filtering device; 21-floating cylinder; 22-first driving mechanism; 23-first filter screen barrel; 24-flushing pipe; 25-limiting mechanism; 26-tension spring; 27-installation pipe; 28-first water pump; 29-transfer pipe; 3-secondary filtering device; 31-conical pipe; 311-large-headed conical pipe; 312-small-headed conical pipe; 313-cap; 32-water inlet pipe; 4-third-stage filtering device; 41-second filter screen barrel; 42-second driving mechanism; 43-scraper; 44-spray pipe; 45-installation frame; 5-fourth-stage filtering device; 51-liquid storage barrel; 52-third filter screen barrel; 6-second water pump; 7-reel assembly; 8-three-way valve; 9-safety valve. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and the accompanying drawings are not drawn to scale and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] The present invention relates to a sewage filtration system, which can be used on a sanitation cleaning sewage suction truck, and the pumped sewage can be filtered and reused, thereby improving work efficiency and saving water resources. The sewage filter inlet of the existing sewage filtration system for cleaning sewage suction trucks is relatively fixedly arranged on the sewage tank 11. The sewage filter inlet is set relatively high, which makes it impossible to filter when the liquid level is low, and it is easy to be blocked by heavier impurities in the sewage when it is set low, which is inconvenient to use. The sewage filtration system of the present invention is hinged on the sewage tank 11 through a float 21, which floats according to the liquid level in the tank, and drives the first filter screen barrel 23 to float. It can solve the problem that the sewage filter inlet of the existing sewage filtration system is fixed too high and cannot filter sewage, and is set too low and is easy to be blocked by impurities. The first drive mechanism 22 drives the first filter screen barrel 23 to rotate, which can effectively avoid the clogging of the filter mesh of the first filter screen barrel 23; the overall structure is simple, easy to use, and has great promotion value.

[0045] A sewage filtration system, specifically, Figure 1-6 As shown, it includes a sewage tank 11, a primary filtering device 2 and a clean water tank 12, the sewage tank 11 includes a tank door 14; the tank door 14 can be hinged on the sewage tank 11; the primary filtering device 2 is arranged in the sewage tank 11, including a float 21 hinged on the sewage tank 11, a first driving mechanism 22 fixedly connected to the float 21 and a first filter screen barrel 23 drivingly connected to the first driving mechanism 22, the first driving mechanism 22 is used to drive the first filter screen barrel 23 to rotate; the clean water tank 12 is connected to a first water pump 28, the first water pump 28 pipeline is connected to the first filter screen barrel 23, and the first water pump 28 is used to pump the filtered water of the first filter screen barrel 23 into the clean water tank 12. The first driving mechanism 22 uses a hydraulic motor to drive the first filter screen barrel 23 to rotate around its own axis, and the hydraulic motor can be used in a relatively harsh environment. In addition, a motor can also be used as the first driving mechanism 22. During filtering, the buoy 21 floats on the liquid surface so that the first filter screen barrel 23 is located on the liquid surface to filter the sewage with fewer impurities on the upper layer of the sewage. The first driving mechanism 22 drives the first filter screen barrel 23 to rotate, which can effectively reduce impurities from clogging the filter holes of the first filter screen barrel 23.

[0046] In a preferred embodiment, Figure 1As shown, the sewage tank 11 and the clean water tank 12 are integrated into the same double-chamber tank body 1, and a sealing partition 13 is slidably provided in the double-chamber tank body 1. The sealing partition 13 divides the double-chamber tank body 1 into two chambers, which are used as the sewage tank 11 and the clean water tank 12 respectively, that is, the two chambers of the double-chamber tank body 1 are used as the inner chambers of the sewage tank 11 and the clean water tank 12 respectively. The sealing partition 13 can use an air pump to adjust the air pressure in the clean water tank 12 and / or the sewage tank 11 to achieve sliding of the sealing partition 13, and can also use a driving device such as a hydraulic telescopic cylinder to move the sealing partition 13. The double-chamber tank body 1 is separated by the sealing partition 13, and the sliding sealing partition 13 can adjust the volume of the clean water tank 12 and the sewage tank 11, which is convenient for increasing the maximum volume of the clean water tank 12 when storing clean water at the water filling station before operation; saving space occupied on the sewage cleaning suction truck.

[0047] In a preferred embodiment, Figure 2-3 As shown, the primary filtering device 2 also includes a flushing mechanism for flushing the inner wall of the first filter screen barrel 23; the flushing mechanism includes a flushing pipe 24 disposed in the first filter screen barrel 23; a flushing hole is disposed on the flushing pipe 24; and a nozzle is disposed on the flushing hole. In addition, the flushing pipe 24 can also be disposed outside the first filter screen barrel 23 to flush the outer wall of the first filter screen barrel 23. The flushing mechanism of the present invention has a simple structure, and the wall of the first filter screen barrel 23 can be flushed through the flushing pipe 24 and its flushing hole to prevent impurities from clogging the filter screen holes of the first filter screen barrel 23.

[0048] In one embodiment, Figure 2-3 As shown, the sewage filtration system further includes a limiting mechanism 25, which is arranged on the primary filtration device 2 and is used to abut against the sewage tank 11 to limit the rotation angle of the buoy 21 when the buoy 21 rotates around the hinge. Preferably, the limiting mechanism 25 includes limiting struts, which are respectively arranged on the upper and lower sides of the buoy 21 and are used to abut against the sewage tank 11 to limit the rotation angle of the buoy 21 when the buoy 21 rotates around the hinge. When the liquid level in the sewage tank 11 is too high, the buoy 21 abuts against the tank body of the sewage tank 11 through the upper limiting strut to limit the rotation of the buoy 21; when the liquid level in the sewage tank 11 is too low, the buoy 21 abuts against the tank body of the sewage tank 11 through the lower limiting strut to limit the rotation of the buoy 21, so as to avoid the primary filtration device 2 from falling on the sewage tank 11 due to the sudden drop of the liquid level in some cases, such as when the tank door 14 is opened, causing damage.

[0049] In a further embodiment, Figure 2 As shown, the primary filtering device 2 also includes a buffer mechanism, which includes a tension spring 26, the top end of which is fixedly connected to the sewage tank 11, and the bottom end of which is fixedly connected to the float 21; the tension spring 26 can slow down the speed at which the float 21 and the filter screen barrel rotate and fall around the hinge to avoid falling on the sewage tank 11.

[0050] In order to facilitate opening the tank door 14 to clean the impurities in the sewage tank 11 and avoid the first-level filtering mechanism hindering the cleaning, such as Figure 3 As shown, the primary filter device 2 is arranged on the tank door 14, and a mounting pipe 27 is arranged on the tank door 14. One end of the mounting pipe 27 is connected to the first water pump 28, and the other end is rotatably provided with a transfer pipe 29. The transfer pipe 29 is sealed and connected to the mounting pipe 27. The transfer pipe 29 can be in an L-shaped structure. The float 21 is hinged on the mounting pipe 27, and the transfer pipe 29 is connected to the first filter net barrel 23. The first water pump 28 sucks the first water pump 28 filtered in the first filter net barrel 23 into the clean water tank 12 through the mounting pipe 27. The transfer pipe 29 and the mounting pipe 27 can be rotatably sealed and connected using a shaft sleeve and a nylon sleeve. The shaft sleeve is sleeved in the mounting pipe 27, and the nylon sleeve is sleeved outside the transfer pipe 29 and sleeved in the shaft sleeve to achieve a sealed connection. The primary filter device 2 is hinged on the tank door 14 through the mounting pipe 27, and moves with the tank door 14 when the tank door 14 is opened, so as to facilitate the cleaning of impurities in the sewage tank 11 after the tank door 14 is opened.

[0051] In certain embodiments, such as Figure 1 As shown, the sewage filtration system also includes a secondary filtration device 3, which is arranged on the output pipeline of the primary filtration device 2. The secondary filtration device 3 includes a cyclone separator, which is provided with two outlets located at the top and bottom ends. The top outlet pipeline is connected to the clean water tank 12, and the bottom outlet pipeline is connected to the sewage tank 11. The cyclone separator is provided with a water inlet located on the side, and the water inlet pipeline is connected to the first filter screen barrel 23, which is used to form a spiral water flow to discharge heavier impurities into the sewage tank 11 and the upper water into the clean water tank 12, and perform secondary filtration on the water filtered by the first filter screen barrel 23. The spiral water flow formed by the cyclone separator discharges the heavier impurities in the lower layer into the sewage tank 11, and the upper water into the clean water tank 12, further improving the filtering effect and forming a circulating filtration.

[0052] Based on the present sewage filtration system, the secondary filtration device 3 is also included, such as Figure 4As shown, the cyclone separator includes a water inlet pipe 32 and a conical pipe 31 with a large top and a small bottom. The water inlet pipe 32 is connected to the side wall of the large end of the conical pipe 31 and is tangent to the pipe wall of the large end to form a cyclone; the top and bottom ends of the conical pipe 31 are connected to the clean water tank 12 and the sewage tank 11 respectively; the outlet of the conical pipe 31 connected to the clean water tank 12 is lower than the water inlet pipe 32. Preferably, the secondary filtering device 3 includes a plurality of cyclone separators, and a water outlet pipe is provided at the top of the conical pipe 31. One end of the water outlet pipe is connected to the clean water tank 12, and the other end is inserted into the conical pipe 31 and is located below the water inlet pipe 32, so as to prevent the water injected from the water inlet pipe 32 from flowing into the clean water tank 12 through the water outlet pipe without spiral centrifugal filtration. The cyclone separator has a simple structure. The water inlet pipe 32 is connected to the conical tube 31 and is tangent to the wall of the conical tube 31, so that water flows into the conical tube 31 to form a spiral water flow. The heavier impurities in the water are discharged into the sewage tank 11 for circulation filtration, and the upper clean water can be discharged into the clean water tank 12 for standby use.

[0053] Based on the cyclone separator including a conical tube 31, such as Figure 5 As shown, the conical tube 31 includes a large-head conical tube 311, a small-head conical tube 312 detachably arranged on the large-head conical tube 311, and a cap 313 arranged on the large end of the large-head conical tube 311; the cap 313 is provided with the above-mentioned water outlet pipe; the water inlet pipe is tangentially connected to the circumferential side of the cap 13. The large-head conical tube 311 and the small-head conical tube 312 can be detachably fastened through a connector, so that the small-head conical tube 312 can be easily disassembled to clean impurities.

[0054] In certain embodiments, such as Figure 1 and Figure 6 As shown, the sewage filtration system also includes a three-stage filtration device 4, which is arranged in the clean water tank 12. The three-stage filtration device 4 includes a mounting frame 45 and a second filter screen barrel 41 rotatably arranged on the mounting frame 45, a second water pump 6 connected to the second filter screen barrel 41 by a pipeline, and a second drive mechanism 42 connected to the second filter screen barrel 41 by transmission, and the second drive mechanism 42 is used to drive the second filter screen barrel 41 to rotate; the second drive mechanism 42 is preferably a hydraulic motor. After being filtered by the primary filter device 2 and / or the secondary filter device 3, the impurities in the sewage are relatively small, and the three-stage filtration device 4 can be arranged at the bottom of the clean water tank 12. The three-stage filtration device 4 can be used to filter again to further improve the filtering effect of the sewage.

[0055] Based on the present sewage filtration system, a three-stage filtration device 4 is also included, such as Figure 6As shown, the three-stage filtration system also includes a scraper 43, which is fixed on the mounting frame 45 and is used to scrape off impurities attached to the outer wall of the second filter screen barrel 41; preferably, the mounting frame 45 is also provided with a nozzle 44, and the nozzle 44 is provided with a water spray port for flushing the outer wall of the second filter screen barrel 41; the second filter screen barrel 41 is connected to the outside of the clean water tank 12 through a connecting pipe for use. Preferably, the filter mesh holes of the first filter screen barrel 23 and the second filter screen barrel 41 are reduced in sequence. The scraper 43 can be used to scrape off impurities attached to the outside of the second filter screen barrel 41; the nozzle 44 can be used to flush the second filter screen barrel 41 and clear the blocked filter mesh holes of the second filter screen barrel 41.

[0056] Based on the present sewage filtration system, a three-stage filtration device 4 is also included, such as Figure 1 and Figure 7 As shown, the sewage filtration system also includes a four-stage filtration device 5, the water inlet pipeline of the four-stage filtration device 5 is connected to the second filter screen barrel 41, the four-stage filtration device 5 includes a pipeline connected to the liquid storage barrel 51 in the second filter screen barrel 41, a third filter screen barrel 52 arranged in the liquid storage barrel 51, a water outlet connected to the third filter screen barrel 52 arranged on the liquid storage barrel 51, and a second water pump 6 is arranged on the water outlet of the third filter screen barrel 52, which is used to discharge the water filtered by the third filter screen barrel 52 for direct use. Preferably, the filter mesh holes of the second filter screen barrel 41 and the third filter screen barrel 52 are reduced in sequence.

[0057] Another aspect of the present invention provides a cleaning and suctioning sewage truck, comprising the sewage filtration system provided by the present invention, a sewage suction pump arranged on the sewage tank 11, and a reel assembly 7 connected to the first filter screen barrel 23; the reel assembly 7 includes a reel and a hose arranged on the reel. When a multi-stage filtering device is provided, the hose is connected to the filtering device at the end. For example, the sewage filtration system is provided with a four-stage filtration, and the hose is connected to the connecting pipe of the four-stage filtering device 5. The cleaning and suctioning sewage truck of the present invention can use the clean water stored in the clean water tank 12 to flush and dredge the sewer, and the sewage in the sewer is sucked by the sewage suction pump, and then recycled after filtering through the sewage filtration system, which can improve the utilization rate of water, avoid the time waste caused by going back and forth to the water filling station to add water after the water stored in the clean water tank 12 is used up, and improve work efficiency.

[0058] In a preferred embodiment, Figure 1As shown, there are multiple reel assemblies 7, which are connected to the outlet of the second water pump 6 through a three-way pipe. Valves and water pumps can be added to each pipeline of the present invention. In a specific solution, two reel assemblies 7 are provided, one reel assembly 7 is used to dredge the sewer, and the other can be used to flush the vehicle body; a safety valve 9 is provided on the second water pump 6, and the second water pump 6 is connected to the two reel assemblies 7 through a three-way valve 8, and a safety valve 9 is also installed between one reel assembly 7 and the three-way valve 8, and this safety valve 9 is respectively connected to a reel assembly 7 and a clean water tank 12 through the three-way valve 8. Preferably, a slag discharge port is provided on the clean water tank 12, which is used to discharge a small amount of impurities by flushing the clean water tank 12.

[0059] In actual use, first go to the water filling station to add water and store it in the clean water tank 12. After flushing the sewer, extract sewage into the sewage tank 11 according to the operation situation. The float 21 floats on the liquid surface and drives the first filter screen barrel 23 to be located at the upper layer of the sewage. The first driving mechanism 22 drives the first filter screen barrel 23 to rotate, which can effectively reduce the impurities attached to the first filter screen barrel 23. The first water pump 28 sucks the water in the first filter screen barrel 23 to the cyclone separator for secondary filtration. The impurities flow back to the sewage tank 11 under the centrifugal force and gravity of the cyclone separator for circulation filtration. The water in the upper layer of the cyclone separator is discharged into the clean water tank 12 and filtered three times by the three-stage filtering device 4. The second driving mechanism 42 drives the second filter screen barrel 41 to rotate, and at the same time, the scraper 43 removes a small amount of impurities attached to the second filter screen barrel 41. The water filtered by the second filter screen barrel 41 is filtered by the third filter screen barrel 52 and pumped into the hose of the reel assembly 7 by the second water pump 6 for use.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sewage filtration system, characterized in that: include, A sewage tank (11), wherein the sewage tank (11) comprises a tank door (14); A primary filtering device (2), the primary filtering device (2) being arranged in the sewage tank (11), comprising a buoy (21) hinged on the sewage tank (11), a first driving mechanism (22) fixedly connected to the buoy (21), and a first filter screen barrel (23) drivingly connected to the first driving mechanism (22), wherein the first driving mechanism (22) is used to drive the first filter screen barrel (23) to rotate; A clean water tank (12), wherein the clean water tank (12) is connected to a first water pump (28), and the first water pump (28) is connected to a first filter screen barrel (23).

2. A sewage filtration system according to claim 1, characterized in that: The sewage tank (11) and the clean water tank (12) are integrated into the same double-chamber tank body (1). A sealing partition (13) is slidably provided inside the double-chamber tank body (1). The sealing partition (13) divides the double-chamber tank body (1) into two chambers, which are used as the sewage tank (11) and the clean water tank (12) respectively.

3. A sewage filtration system as claimed in claim 1, characterized in that: The primary filtering device (2) further comprises a flushing mechanism for flushing the inner wall of the first filter screen barrel (23); the flushing mechanism comprises a flushing pipe (24) arranged in the first filter screen barrel (23); and the flushing pipe (24) is provided with a flushing hole.

4. A sewage filtration system as claimed in claim 1, characterized in that: It also comprises a limiting mechanism (25), which is arranged on the primary filtering device (2) and is used to abut against the sewage tank (11) to limit the rotation angle of the float (21) when the float (21) rotates around the hinge.

5. A sewage filtration system as claimed in claim 4, characterized in that: The invention also comprises a buffer mechanism, the buffer mechanism comprising a tension spring (26) having a top end fixedly connected to the sewage tank (11) and a bottom end fixedly connected to the buoy (21); a mounting pipe (27) is provided on the tank door (14); one end of the mounting pipe (27) is connected to the first water pump (28), and the other end is rotatably provided with a transfer pipe (29); the buoy (21) is hinged on the mounting pipe (27), and the transfer pipe (29) is connected to the first filter screen barrel (23).

6. A sewage filtration system according to any one of claims 1 to 5, characterized in that: The invention also comprises a secondary filtering device (3) arranged on the output pipeline of the primary filtering device (2), the secondary filtering device (3) comprising a cyclone separator whose top and bottom ends are respectively connected to the clean water tank (12) and the sewage tank (11), and the water inlet pipeline of the cyclone separator is connected to the first filter screen barrel (23) for forming a spiral water flow to discharge heavier impurities into the sewage tank (11) and discharge upper water into the clean water tank (12).

7. A sewage filtration system as claimed in claim 6, characterized in that: The cyclone separator comprises a water inlet pipe (32) and a conical pipe (31) with a large top and a small bottom. The water inlet pipe (32) is connected to the pipe wall of the large end of the conical pipe (31) and is tangent to the pipe wall of the large end to form a cyclone. The top and bottom ends of the conical pipe (31) are respectively connected to a clean water tank (12) and a sewage tank (11). The outlet of the conical pipe (31) connected to the clean water tank (12) is lower than the water inlet pipe (32).

8. A sewage filtration system according to any one of claims 1 to 5, characterized in that: The invention also comprises a three-stage filtering device (4) arranged in the clean water tank (12), the three-stage filtering device (4) comprising a mounting frame (45), a second filter screen barrel (41) rotatably arranged on the mounting frame (45), a second water pump (6) connected to the second filter screen barrel (41) by a pipeline, and a second driving mechanism (42) drivingly connected to the second filter screen barrel (41), the second driving mechanism (42) being used to drive the second filter screen barrel (41) to rotate.

9. A sewage filtration system as claimed in claim 8, characterized in that: The mounting frame (45) is fixedly provided with a scraper (43) for scraping off impurities attached to the outer wall of the second filter screen barrel (41); the mounting frame (45) is also provided with a spray pipe (44), and the spray pipe (44) is provided with a water spray port for washing the outer wall of the second filter screen barrel (41); the second filter screen barrel (41) is connected to the outside of the clean water tank (12) through a connecting pipe.

10. A sewage cleaning and suction vehicle, characterized in that: It comprises a sewage filtration system as claimed in any one of claims 1 to 9, a sewage suction pump arranged on a sewage tank (11) and a reel assembly (7) connected to the first filter screen barrel (23); the reel assembly (7) comprises a reel and a hose arranged on the reel.

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