Sanitation vehicle sewage circulating device

Abstract

The invention discloses a sanitation truck sewage circulating device, and belongs to the technical field of sanitation trucks, the sanitation truck sewage circulating device comprises a clear water tank and a sewage tank, the sanitation truck sewage circulating device further comprises a rough filtration mechanism, a fine filtration mechanism and a residue filtering tank, the rough filtration mechanism comprises a rough filtration tank, a filter plate and a first cleaning assembly, and sewage in the sewage tank enters the rough filtration tank from the top of the rough filtration tank, flows through the filter plate and then enters the fine filtration mechanism; the fine filtration mechanism comprises a fine filtration box, a conical filter screen and a second cleaning assembly, and roughly filtered water filtered by the rough filtration box enters the fine filtration box, flows through the conical filter screen and then is conveyed into the clear water tank through a water pump. The coarse filtration mechanism and the fine filtration mechanism are designed to perform secondary filtration on sewage, and a first cleaning assembly and a second cleaning assembly are designed in the coarse filtration mechanism and the fine filtration mechanism respectively to clean a filter plate and a conical filter screen, so that the whole circulating device can maintain high-efficiency operation, and the sewage filtration effect is improved; and the filtered sewage is conveyed into the clean water tank for cyclic utilization, so that the clean water of the sanitation vehicle is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sanitation vehicles, in particular to a sewage recycling device of a sanitation vehicle. BACKGROUND

[0002] The sanitation vehicle refers to a special vehicle specially used for urban appearance arrangement and cleaning, and generally has one or more of the functions of road cleaning, garbage cleaning and transportation, dust removal, watering and snow removal. At present, some sanitation vehicles have the functions of road cleaning and road washing. Because of the large amount of water, a sewage recycling and regeneration recycling system is equipped, through a filtering system, the clean water generated by filtering the sewage in the sewage tank is reflowed into the clean water tank, so as to realize the recycling of sewage. Because some garbage, stones and other impurities will be inevitably sucked into the sewage recycling, the filter screen is very easy to be blocked, and the filtering efficiency is reduced. SUMMARY

[0003] In view of the above technical deficiencies, the purpose of the present application is to provide a sewage recycling device of a sanitation vehicle, which can filter sewage, be reused and have an anti-blocking function.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is as follows: the present application provides a sewage recycling device of a sanitation vehicle, which comprises a clean water tank and a sewage tank, and further comprises a coarse filtering mechanism, a fine filtering mechanism and a filter residue tank, The coarse filtering mechanism comprises a coarse filtering tank, a filter plate and a first cleaning assembly, sewage in the sewage tank enters the coarse filtering tank from the top of the coarse filtering tank and flows through the filter plate to enter the fine filtering mechanism, the filter plate comprises a fixed frame and a plurality of blocking strips fixed on the fixed frame, the plurality of blocking strips are parallel and uniformly spaced, and one side of the coarse filtering tank is provided with a first residue discharge pipe; The fine filtering mechanism comprises a fine filtering tank, a conical filter screen and a second cleaning assembly, coarse filtered water in the coarse filtering tank enters the fine filtering tank and flows through the conical filter screen, and then is delivered to the clean water tank by a water pump; the fine filtering tank is connected with a second residue discharge pipe; The first cleaning assembly pushes the coarse residue intercepted on the filter plate into the first residue discharge pipe, the second cleaning assembly cleans the fine residue on the conical filter screen into the second residue discharge pipe, and the first residue discharge pipe and the second residue discharge pipe are both in communication with the filter residue tank.

[0005] Preferably, the first cleaning assembly comprises: a guide rail parallel to the blocking strip and fixed on the side wall of the coarse filtering tank; a sliding seat slidingly installed on the guide rail; a lifting rod slidingly installed on the sliding seat; a dredging piece fixed on the top of the lifting rod through a connecting plate; a movement guide structure for adjusting the position of the lifting rod on the sliding seat.

[0006] Preferably, the movement guide structure comprises: a guide block fixed at the bottom of the lifting rod, both sides of the guide block being provided with guide inclined surfaces; two guide seats, both of which are fixed on the side wall of the coarse filter box, and each of which is provided with an upper guide surface and a lower guide surface, the lifting rod being lifted in the sliding seat when the guide block cooperates with the upper guide surface, and the lifting rod being lowered in the sliding seat when the guide block cooperates with the lower guide surface; a limiting structure, the lifting rod being fixed in the sliding seat through the limiting structure when the guide block is disengaged from the cooperation with the guide seat.

[0007] Preferably, the limiting structure comprises: a limiting pin, which is slidingly installed on the sliding seat, two positioning holes being formed on the lifting rod and cooperating with the limiting pin, and a first spring being arranged on the sliding seat and applying a pushing force to the limiting pin in the direction of the lifting rod; two unlocking units, each of which comprises a connecting block and an unlocking block, the connecting block being fixed on the side wall of the coarse filter box, and the unlocking block being hingedly connected to the connecting block, a torsional spring being arranged on the hinged shaft between the unlocking block and the connecting block and used for abutting one side of the unlocking block against the connecting block; wherein, the limiting pin is fixed with an unlocking column, the unlocking end of the unlocking block making the limiting pin pulled out of the positioning hole when the unlocking column abuts against the unlocking end of the unlocking block.

[0008] Preferably, the dredging piece comprises a plurality of parallel dredging pieces, the dredging pieces being staggered with the blocking strips, and the dredging pieces being provided with a top slag slope and a slag pushing rod.

[0009] Preferably, the fine filter box comprises an inner cylinder and an outer cylinder, the outer cylinder being sleeved outside the inner cylinder, the conical filter screen being arranged at the top of the inner cylinder, and the second slag discharging pipe being in communication with the outer cylinder.

[0010] Preferably, the second cleaning assembly comprises: a main shaft, which is rotatably installed in the inner cylinder, the axis of the main shaft coinciding with the axis of the conical filter screen, and the conical filter screen being sleeved on the main shaft; a spring piece, which is fixed on the main shaft inside the conical filter screen; an intermittent poking structure, which is arranged in the inner cylinder, the intermittent poking structure repeatedly poking the spring piece when the main shaft rotates, so that the spring piece knocks the inner wall of the conical filter screen.

[0011] Preferably, the intermittent poking structure comprises: A plurality of the dial pieces are evenly distributed on the inner wall of the inner cylinder, and the dial piece has a force storage part and a release part; A dial rod is slidably inserted into the main shaft and is perpendicular to the main shaft, and a longitudinal rod is arranged at the end of the dial rod away from the main shaft, and a pulling part is arranged on the longitudinal rod and matched with the elastic piece, and a second spring is arranged on the dial rod between the longitudinal rod and the main shaft, and a limiting ring is arranged at the end of the dial rod away from the longitudinal rod. When the main shaft rotates and the longitudinal rod is matched with the force storage part, the longitudinal rod compresses the second spring, and the pulling part pulls the end of the elastic piece away from the main shaft towards the main shaft; when the longitudinal rod is matched with the release part, the second spring pushes the longitudinal rod to reset, and the elastic piece rebounds and knocks the inner wall of the conical filter screen.

[0012] Preferably, the pulling part includes a pulling rod which is perpendicular to the longitudinal rod and the dial rod, and the end of the elastic piece away from the main shaft is provided with a hook part, and when the longitudinal rod compresses the second spring, the pulling rod is buckled in the hook part and makes the elastic piece elastically deform.

[0013] Preferably, a scraper is fixed on the main shaft through a connecting frame, and when the main shaft rotates, the scraper discharges the filter residue in the outer cylinder from the second residue discharging pipe.

[0014] The beneficial effects of the present application are as follows: The present application designs a coarse filter mechanism and a fine filter mechanism to perform two-stage filtration on sewage, and a first cleaning assembly and a second cleaning assembly are respectively arranged in the coarse filter mechanism and the fine filter mechanism to clean the filter plate and the conical filter screen, so that the whole circulating device can maintain high-efficiency operation, the filtration effect of sewage is improved, the filtered sewage is delivered to the clean water tank for recycling, and the cleaning water of the sanitation vehicle is saved; the filter plate designed by the present application includes a plurality of parallel blocking bars, the unblocking piece in the first cleaning assembly can reciprocatingly move horizontally and lift, and can effectively push the coarse residue filtered between the blocking bars into the filter residue tank; and the second cleaning assembly designed by the present application can clean the conical filter screen, and when the main shaft rotates, the elastic piece periodically knocks the inner wall of the conical filter screen, so that the filter residue is shaken and falls into the outer cylinder, the conical filter screen is prevented from being blocked, and the whole circulating filter device can maintain a good filtration state. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 The present application provides a sanitation vehicle sewage circulating device.

[0017] Figure 2 isometric view of the coarse filtering mechanism and the fine filtering mechanism of the present application.

[0018] Figure 3 top view of the coarse filtering mechanism and the fine filtering mechanism of the present application.

[0019] Figure 4 isometric view of Figure 3 sectional view at A-A.

[0020] Figure 5 isometric view of Figure 3 sectional view at B-B.

[0021] Figure 6 isometric view of Figure 5 sectional view at D-D.

[0022] Figure 7 isometric view of the filter plate and the dredging piece of the present application.

[0023] Figure 8 isometric view of the fine filtering mechanism of the present application.

[0024] Figure 9 isometric view of the second cleaning mechanism of the present application.

[0025] Figure 10 top view of the second cleaning mechanism of the present application.

[0026] BRIEF DESCRIPTION OF DRAWINGS 1, clean water tank, 2, sewage tank, 3, filter residue tank, 4, coarse filter tank, 5, fixed frame, 6, blocking strip, 7, first residue discharge pipe, 8, fine filter tank, 9, conical filter screen, 10, water pump, 11, second residue discharge pipe, 12, guide rail, 13, sliding seat, 14, lifting rod, 15, connecting plate, 16, guide block, 17, guide inclined surface, 18, upper guide seat, 19, lower guide seat, 20, upper guide surface, 21, lower guide surface, 22, limit pin, 23, positioning hole, 24, first spring, 25, blocking ring, 26, connecting block, 27, unlocking block, 28, unlocking column, 29, unlocking end, 30, dredging piece, 31, residue discharging slope, 32, residue discharging lever, 33, inner cylinder, 34, outer cylinder, 35, main shaft, 36, elastic piece, 37, pushing piece, 38, force storage part, 39, releasing part, 40, pushing lever, 41, vertical rod, 42, second spring, 43, limit ring, 44, pull rod, 45, hook part, 46, scraper, 47, connecting frame, 48, lead screw, 49, motor. DETAILED DESCRIPTION

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: like Figures 1 to 10 As shown, this invention provides a sewage recycling device for sanitation vehicles, mainly comprising a clean water tank 1, a sewage tank 2, a coarse filtration mechanism, a fine filtration mechanism, and a filter residue tank 3. The coarse filtration mechanism includes a coarse filter box 4, filter plates, and a first cleaning assembly, capable of initially filtering large particles such as stones from the sewage. Specifically, as... Figure 1 As shown, the sewage in sewage tank 2 flows downwards naturally due to gravity and enters the coarse filter tank 4 below. The filter plate is fixed to the top of the coarse filter tank 4 and consists of a fixing frame 5 and multiple parallel and evenly spaced baffles 6. These baffles 6 effectively intercept large particulate impurities in the sewage, preventing them from passing through the gaps between the baffles 6. In order to remove the filtered large particulate impurities from the filter plate in a timely manner and maintain good filtration efficiency, this invention designs a first cleaning component that can discharge large particulate impurities from the first slag discharge pipe 7 installed on the side of the coarse filter tank 4 into the filter slag box 3.

[0029] like Figures 2 to 7 As shown, the first cleaning component of this invention includes a guide rail 12, a slide 13, a lifting rod 14, a cleaning component, and a motion guide structure. By properly driving the cleaning component to move, large particles of impurities on the filter plate can be removed. Figure 7 As shown, the unblocking component of the present invention includes multiple parallel unblocking plates 30, which are arranged alternately with the baffles 6. The unblocking plates 30 can be inserted between adjacent baffles 6. Each unblocking plate 30 is provided with a top slag slope 31 and a slag-dispelling rod 32. When the unblocking plate 30 moves from bottom to top, it can insert the slag-dispelling rod 32 and the top slag slope 31 into the gap between two adjacent baffles 6. Then, the unblocking plate 30 moves parallel to the baffles 6, and the top slag slope 31 can push out large particles of impurities stuck in the gaps between the baffles 6, thereby achieving the function of conveying the filter gaps between the baffles 6. The slag-dispelling rod 32 can push large particles of impurities towards the first slag discharge pipe 7, thereby completing the cleaning of the filter plate and effectively improving the cleaning efficiency.

[0030] In order to prevent large particles of impurities from being pushed backward when the unclogging plate 30 is reset, the unclogging plate 30 of the present invention will first move downward when reset, so that the unclogging plate 30 moves to the bottom of the filter plate, and then the unclogging plate 30 moves in the opposite direction to reset.

[0031] In this invention, multiple unclogging plates 30 are fixed to a connecting plate 15, which is fixed to the top of the lifting rod 14. A guide rail 12 is parallel to the baffle 6 and fixedly installed on the outer wall of the coarse filter box 4, while a slide block 13 is slidably engaged with the guide rail 12. The lifting rod 14 is movably inserted into the slide block 13 and can move vertically on the slide block 13. To enable the unclogging plates 30 to move cyclically in the aforementioned manner, the motion guiding structure designed in this invention includes a guide block 16 fixed to the bottom of the lifting rod 14, and an upper guide seat 18 and a lower guide seat 19. Figure 5 When observing from the reference position, as the slider moves to the right, when the guide slope 17 on the side of the guide block 16 engages with the lower guide surface 21 on the lower guide seat 19, the lifting rod 14 will move downward in the slide seat 13, thereby allowing the slag-removing rod 32 to move below the filter plate; while when the slider moves to the left, the guide slope 17 on the other side of the guide block 16 will engage with the upper guide surface 20 on the upper guide seat 18, causing the lifting rod 14 to move upward in the slide seat 13, thereby allowing the slag-removing rod 32 to move from below the filter plate to above the filter plate.

[0032] To ensure that the slag-removing rod 32 can move parallel to the track when pushing large particles of impurities, the motion guiding structure designed in this invention also includes a limiting structure. For example... Figures 4 to 6 As shown, the limiting structure of the present invention specifically includes a limiting pin 22 slidably mounted on the slide block 13 and two positioning holes 23 formed on the lifting rod 14. A retaining ring 25 is fixed on the limiting pin 22, and a first spring 24 is also sleeved on the limiting pin 22. The first spring 24 pushes the retaining ring 25, causing the limiting pin 22 to press against the lifting rod 14. When the lifting rod 14 moves in the slide block 13, so that the positioning holes 23 are opposite to the limiting pin 22, the limiting pin 22 is inserted into the positioning holes 23, thereby locking the position of the lifting rod 14 in the slide block 13, thus ensuring that the slag-removing rod 32 can move parallel to the track when pushing large particles of impurities.

[0033] When the lifting rod 14 needs to move up or down, the engagement between the limiting pin 22 and the positioning hole 23 must be released first. Therefore, this invention designs two unlocking units. Figures 4 to 6 As shown, the unlocking unit of the present invention includes an unlocking block 27 and a connecting block 26, wherein the connecting block 26 is fixed to the side wall of the coarse filter box 4, and the unlocking block 27 is hinged to the connecting block 26. A torsion spring is sleeved on the hinge axis between the unlocking block 27 and the connecting block 26. Under the action of the torsion spring, one end of the unlocking block 27 abuts against the connecting block 26, while the other end forms an unlocking end 29. Figure 4As shown, the limit pin 22 is fixed with an unlocking column 28. When the unlocking column 28 moves to the unlocking end 29 of the unlocking block 27, the inclined surface of the unlocking end 29 can push the unlocking column 28 to move, so as to make the limit pin 22 compress the first spring 24 and pull out from the positioning hole 23, allowing the lifting rod 14 to lift. When the unlocking column 28 moves to the non-unlocking end 29 of the unlocking block 27, the unlocking column 28 can push the unlocking block 27 to compress the torsion spring and rotate, so the unlocking column 28 cannot move the limit pin 22.

[0034] Through the above setting, when the slider reciprocates on the guide rail 12, the moving process of the unblocking piece 30 rising, pushing the large particle impurities, and descending and resetting can be realized, so as to complete the cleaning of the filter plate and maintain good filtering efficiency.

[0035] The fine filtering mechanism designed by the present application comprises a fine filtering box 8 located below the coarse filtering box 4, a conical filter screen 9 arranged in the fine filtering box 8, and a second cleaning assembly. The conical filter screen 9 is a metal filter screen, and the filter hole diameter of the conical filter screen 9 is smaller than the gap between the blocking strips 6. The water filtered by the coarse filtering box 4 enters the fine filtering box 8 and is further filtered by the conical filter screen 9, and the filtered water is pumped by the water pump 10 to the clean water tank 1 for recycling.

[0036] In order to avoid the blockage of the conical filter screen 9, the fine filtering box 8 is also provided with a second residue discharge pipe 11 for discharging the fine residue cleaned by the second cleaning assembly. The first residue discharge pipe 7 and the second residue discharge pipe 11 are both connected with the residue tank 3, so as to ensure that all the residue is finally collected.

[0037] Embodiment two: On the basis of embodiment one, the fine filtering box 8 designed by the present application has a double-layer structure, that is, an outer cylinder 34 covers an inner cylinder 33, the conical filter screen 9 is installed on the top of the inner cylinder 33, and the second residue discharge pipe 11 is connected with the outer cylinder 34. The water falling from the coarse residue tank is filtered by the conical filter screen 9, the fine residue slides along the surface of the conical filter screen 9 to the outer cylinder 34, and then is discharged into the residue tank 3 from the second residue discharge pipe 11.

[0038] In order to avoid the blockage of the conical filter screen 9, the present application designs a second cleaning assembly, which comprises a main shaft 35, an elastic piece 36, and an intermittent poking structure. As shown, Figure 4 The main shaft 35 is rotatably installed in the inner cylinder 33 through a support, and the top of the main shaft 35 extends outside the conical filter screen 9. The conical filter screen 9 is sleeved on the main shaft 35 and remains stationary. The elastic piece 36 is fixed on the main shaft 35 inside the conical filter screen 9. When the main shaft 35 rotates, the intermittent poking structure can intermittently poke the elastic piece 36, so that the elastic piece 36 knocks the conical filter screen 9 in the elastic resetting process, and the fine residue on the conical filter screen 9 is shaken to fall into the outer cylinder 34.

[0039] Specifically, the intermittent poking structure of the present application comprises a poking rod 40 and eight poking pieces 37 fixed on the inner wall of the inner cylinder 33 in a circumferential direction, as shown in the figure. Figure 10 As shown in the figure, the poking piece 37 is provided with a force storage part 38 and a release part 39. The poking rod 40 is movably inserted into the bottom of the main shaft 35, and the poking rod 40 is perpendicular to the main shaft 35. The two ends of the poking rod 40 located on both sides of the main shaft 35 are respectively provided with a vertical rod 41 and a limiting ring 43. The second spring 42 is sleeved on the poking rod 40 between the vertical rod 41 and the main shaft 35. Figures 4 to 10 As shown in the figure, when the main shaft 35 rotates, the vertical rod 41 moves along the radial direction of the main shaft 35 under the guidance of the force storage part 38 and compresses the second spring 42. At this time, the pulling part at the top of the vertical rod 41, i.e. the pulling rod 44 fixed on the top of the vertical rod 41, can cooperate with the hook part 45 at the end of the elastic piece 36 away from the main shaft 35 to bend the elastic piece 36, and the elastic piece 36 appears elastic deformation. When the vertical rod 41 moves to the release part 39, the vertical rod 41 will quickly reset under the action of the second spring 42, which makes the pulling rod 44 no longer restrict the hook part 45 of the elastic piece 36. The elastic piece 36 resets under the action of its own elasticity and knocks the conical filter screen 9, thereby shaking off the fine slag on the conical filter screen 9, realizing the cleaning of the conical filter screen 9.

[0040] In order to better discharge the filter slag from the second slag discharge pipe 11, the present application is fixedly installed with a scraper 46 on the main shaft 35 through a connecting frame 47. With the rotation of the main shaft 35, the scraper 46 also rotates and scrapes the filter slag in the outer cylinder 34 from the second slag discharge pipe 11.

[0041] Example three: On the basis of example one and example two, in order to drive the sliding seat 13 to move on the guide rail 12, the present application is rotatably installed with a lead screw 48 on the coarse filter box 4. The lead screw 48 is threadedly matched with the sliding seat 13. The coarse filter box 4 is externally fixed with a motor 49. The motor 49 drives the lead screw 48 to rotate, thereby controlling the movement of the sliding seat 13 on the guide rail 12. Meanwhile, the present application is also rotatably installed with a transmission shaft on the coarse filter box 4. The transmission shaft is parallel to the lead screw 48 and is driven by bevel gear sets with the main shaft 35. The output shaft of the motor 49 is sleeved with a belt pulley one. The transmission shaft is sleeved with a one-way bearing. The outer ring of the one-way bearing is sleeved with a belt pulley two. The belt pulley one and the belt pulley two are wound with a belt. In this way, when the output shaft of the motor 49 rotates, the lead screw 48 can be driven to rotate at the same time and drive the main shaft 35 to rotate through the belt transmission mechanism and the transmission shaft, thereby realizing the movement of the first cleaning assembly and the second cleaning assembly. When the output shaft of the motor 49 reversely drives, the sliding seat 13 in the first cleaning assembly moves reversely, while the one-way bearing does not transmit torque, i.e. the main shaft 35 will not rotate, thereby realizing that one motor 49 drives the coarse filter mechanism and the fine filter mechanism to operate.

[0042] Working principle: sewage from sewage tank 2 into the rough filter tank 4, first through the filter plate preliminary filtration, filter plate on the bar 6 intercept large particles of impurities. First cleaning assembly is started regularly, through the reciprocating movement of slide 13 and the up and down movement of lifting rod 14, drive dredging piece and lift, clean the impurities on the filter plate, and the impurities from the first discharge pipe 7 into the filter residue tank 3. After rough filtration of water into the fine filter tank 8, flow through the conical screen 9 for further filtration, intercept small impurities. Main shaft 35, spring 36 and lever 40 synchronous rotation, intermittent dialing structure makes spring 36 periodically knock conical screen 9 inner wall, the impurities shake off. Scraper 46 rotates with the main shaft 35, the filter residue in the outer cylinder 34 from the second discharge pipe 11 is discharged. After fine filtration of water through the water pump 10 is pumped to the clean water tank 1, for recycling use of sanitation vehicles. In the whole process, the rough and fine filter residue produced by the first discharge pipe 7 and the second discharge pipe 11 into the filter residue tank 3, for regular cleaning. The present application through two-stage filtration and automatic cleaning mechanism, effectively realize the sewage filtration and recycling, significantly improve the sewage treatment capacity of sanitation vehicles.

[0043] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A sewage recycling device for a sanitation vehicle, comprising a clean water tank and a sewage tank, characterized in that, It also includes a coarse filter mechanism, a fine filter mechanism and a filter residue box, The coarse filter mechanism includes a coarse filter box, a filter plate and a first cleaning assembly. Sewage in the sewage tank enters the coarse filter box from the top of the coarse filter box and flows through the filter plate to enter the fine filter mechanism. The filter plate includes a fixed frame and a plurality of blocking strips fixed on the fixed frame. The plurality of blocking strips are parallel and uniformly spaced. One side of the coarse filter box is provided with a first residue discharge pipe. The fine filter mechanism includes a fine filter box, a conical filter screen and a second cleaning assembly. The filtered coarse water in the coarse filter box enters the fine filter box and flows through the conical filter screen, and then is delivered to the clean water tank by a water pump. The fine filter box is connected with a second residue discharge pipe. The first cleaning assembly pushes the coarse residue intercepted on the filter plate into the first residue discharge pipe, and the second cleaning assembly cleans the fine residue on the conical filter screen into the second residue discharge pipe. The first residue discharge pipe and the second residue discharge pipe are in communication with the filter residue box.

2. The sewage circulating device of the sanitation vehicle according to claim 1, characterized in that, The first cleaning assembly includes: a guide rail parallel to the blocking strip and fixed on the side wall of the coarse filter box; a sliding seat slidingly installed on the guide rail; a lifting rod slidingly installed on the sliding seat; a dredging piece fixed on the top of the lifting rod by a connecting plate; a movement guide structure for adjusting the position of the lifting rod in the sliding seat.

3. The sewage circulating device of the sanitation vehicle according to claim 2, characterized in that, The movement guide structure includes: a guide block fixed on the bottom of the lifting rod, both sides of the guide block being provided with guide inclined surfaces; two guide seats fixed on the side wall of the coarse filter box, each of the two guide seats being provided with an upper guide surface and a lower guide surface, the lifting rod being raised in the sliding seat when the guide block cooperates with the upper guide surface, and the lifting rod being lowered in the sliding seat when the guide block cooperates with the lower guide surface; a limiting structure for fixing the lifting rod in the sliding seat when the guide block is disengaged from the guide seat.

4. The sewage circulating device of the sanitation vehicle according to claim 3, characterized in that, The limiting structure includes: a limiting pin slidingly installed on the sliding seat, two positioning holes on the lifting rod being matched with the limiting pin, and a first spring on the sliding seat being arranged to apply a pushing force to the limiting pin in the direction of the lifting rod; two unlocking units including a connecting block and an unlocking block, the connecting block being fixed on the side wall of the coarse filter box, and the unlocking block being hinged to the connecting block, a torsional spring being arranged on the hinged shaft between the unlocking block and the connecting block, and the torsional spring being used to abut one side of the unlocking block against the connecting block; wherein the limiting pin is fixed with an unlocking column, and when the unlocking column abuts against the unlocking end of the unlocking block, the unlocking end makes the limiting pin pulled out of the positioning hole.

5. The sewage circulating device of the sanitation vehicle according to claim 2, characterized in that, The dredging piece includes a plurality of parallel dredging pieces, the dredging pieces being staggered with the blocking strips, and the dredging pieces being provided with residue pushing slopes and residue pushing rods.

6. The sewage circulating device of the sanitation vehicle according to claim 1, characterized in that, The fine filter box includes an inner cylinder and an outer cylinder, the outer cylinder being sleeved outside the inner cylinder, the conical filter screen being arranged on the top of the inner cylinder, and the second residue discharge pipe being in communication with the outer cylinder.

7. A sewage circulating device for a sanitation vehicle as set forth in claim 6 wherein, The second cleaning assembly includes: a main shaft rotationally installed in the inner cylinder, an axis of the main shaft coinciding with an axis of the conical filter screen, and the conical filter screen being sleeved on the main shaft; a spring piece fixed on the main shaft inside the conical filter screen. The intermittent poking structure is arranged in the inner cylinder body, and repeatedly pokes the elastic sheet to make the elastic sheet knock the inner wall of the conical filter screen when the main shaft rotates.

8. A sewage circulating device for a sanitation vehicle as set forth in claim 7, characterized in that, The intermittent poking structure comprises: A plurality of poking sheets are circumferentially distributed on the inner wall of the inner cylinder body, and the poking sheet has a force storage part and a release part; A poking rod is slidably inserted on the main shaft and perpendicular to the main shaft, and a longitudinal rod is arranged at the end of the poking rod away from the main shaft, the longitudinal rod is provided with a pulling part matched with the elastic sheet, a second spring is arranged on the poking rod between the longitudinal rod and the main shaft, and a limiting ring is arranged at the end of the poking rod away from the longitudinal rod; When the main shaft rotates and the longitudinal rod is matched with the force storage part, the longitudinal rod compresses the second spring, and the pulling part pulls the end of the elastic sheet away from the main shaft to the main shaft; when the longitudinal rod is matched with the release part, the second spring pushes the longitudinal rod to reset, the elastic sheet rebounds and knocks the inner wall of the conical filter screen.

9. A sewage circulating device for a sanitation vehicle as set forth in claim 8 wherein, The pulling part comprises a pulling rod perpendicular to the longitudinal rod and the poking rod, and the end of the elastic sheet away from the main shaft is provided with a hook part, when the longitudinal rod compresses the second spring, the pulling rod is buckled in the hook part and makes the elastic sheet elastically deform.

10. The sewage circulating device of the sanitation vehicle according to claim 7, characterized in that, The main shaft is fixed with a scraper through a connecting frame, and the scraper discharges the filter residue in the outer cylinder body from the second residue discharging pipe when the main shaft rotates.

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