Water recovery tank for ship cleaning vehicle

Abstract

The invention relates to a ship cleaning vehicle water recovery water tank in the technical field of sewage treatment, which comprises a tank body, the interior of the tank body is divided into a recovery cavity and an equipment cavity, a water-gas dual-purpose pump is mounted in the equipment cavity, a sewage treatment mechanism is arranged at the bottom in the recovery cavity, and the sewage treatment mechanism comprises an outer filter cartridge and an inner filter cartridge arranged in the outer filter cartridge. A circulation cavity is formed between the inner wall of the outer filter cylinder and the outer wall of the inner filter cylinder, a treatment part is arranged in the circulation cavity, the treatment part penetrates through the bottom of the inner filter cylinder and extends into the inner filter cylinder, the treatment part comprises a hollow disc and a plurality of L-shaped pipes which are arranged in the circulation cavity, and air injection hole groups are formed in the outer walls, close to the outer filter cylinder, of the L-shaped pipes. According to the invention, sewage filtration and aeration are carried out in a dual continuous alternate manner, and meanwhile, filter cartridge cleaning and filtration are carried out alternately and synchronously, so that the sewage treatment effect and efficiency are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a water recovery tank for a ship washing vehicle. Background Art

[0002] The sewage from ship cleaning vehicles mainly includes wastewater generated during the cleaning of oil tanks, washing of cabin dust, cabin dust, oil stains, hull paint, etc. This type of wastewater has complex components and high chroma. Direct discharge will cause damage to the marine ecology, so it is necessary to recycle and treat the sewage before discharge.

[0003] At present, sewage treatment first needs to use a filter device to filter the sewage, and then carry out deep treatment. The clogging of the filter holes of the filter device during filtration affects the filtration efficiency, which is a major problem that needs to be solved urgently. At present, measures such as regular shutdown and cleaning are usually taken, which delays the progress of the filtration work.

[0004] Secondly, in the process of sewage treatment, filtering first and then aeration is a common sewage treatment method, and aeration is also a key step in the sewage treatment process. Its main function is to inject air into the sewage to participate in the decomposition and transformation of organic matter, and finally achieve the purpose of purifying sewage. However, at present, if only one set of aeration devices is set up for a single aeration work, the effect of sewage treatment is low, and if multiple sets of aeration devices are set up to improve the treatment effect, the equipment purchase cost will increase and the pressure on the enterprise will be increased. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions: A water recovery tank for a ship washing vehicle comprises a tank body, the interior of the tank body is divided into a recovery chamber and an equipment chamber, a water-air dual-purpose pump is installed in the equipment chamber, and a sewage treatment mechanism is provided at the bottom of the recovery chamber; The sewage treatment mechanism includes an outer filter cartridge and an inner filter cartridge arranged inside the outer filter cartridge, a flow cavity is arranged between the inner wall of the outer filter cartridge and the outer wall of the inner filter cartridge, and a processing part is arranged in the flow cavity, the processing part passes through the bottom of the inner filter cartridge and extends into the inner filter cartridge, the processing part includes a hollow disc and a plurality of L-shaped tubes arranged in the flow cavity, the plurality of L-shaped tubes are evenly distributed around the outer side of the hollow disc and are connected with the hollow disc, and an air jet hole group is opened on the outer wall of the L-shaped tube to realize dual continuous alternation of sewage filtration and aeration, and realize alternating and synchronous cleaning of the filter cartridge and filtration at the same time.

[0006] Furthermore, at least one V-shaped diverter plate is fixedly provided between two adjacent L-shaped tubes, the jet hole group includes jet hole 1, jet hole 2 and jet hole 3, the L-shaped tube is provided with a plurality of jet holes 1 on the outer wall close to the outer filter cartridge, and the L-shaped tube is provided with a plurality of jet holes 2 on the outer wall close to the inner filter cartridge, the L-shaped tube is provided with a plurality of jet holes 3 on the outer wall close to the V-shaped diverter plate, the aperture of the jet hole 1 is the same as the aperture of the jet hole 2, the aperture of the jet hole 3 is larger than the aperture of the jet hole 1, and the gas flow rate of the jet hole 3 is smaller than the gas flow rates of the jet holes 1 and 2.

[0007] Furthermore, the processing part also includes a fixed hollow disk fixed to the bottom end of the inner filter cartridge, the top of the hollow disk is fixedly connected to a hollow rotating rod, the top of the hollow rotating rod passes through the bottom of the inner filter cartridge and extends into the fixed hollow disk, one end of the hollow rotating rod located in the fixed hollow disk is provided with a through hole connected to the interior of the fixed hollow disk, the hollow rotating rod is rotatably connected to the fixed hollow disk and the inner filter cartridge, and a motor for driving the hollow rotating rod to rotate is fixed to the top of the fixed hollow disk, which is used to drive the hollow disk, L-shaped tube, and V-shaped diverter plate to rotate in the circulation chamber to adjust the position of the L-shaped tube for flushing different filter holes.

[0008] Furthermore, a cover protruding outward from the top of the inner filter cartridge is arranged on the top of the outer filter cartridge, and a top cover is fixedly arranged on the top of the inner filter cartridge; a recovery pipe is arranged on the top of the box body, and the recovery pipe extends into the recovery chamber and is arranged on the outside of the sewage treatment mechanism. The ship cleaning sewage is injected into the recovery chamber through the recovery pipe, and the sewage enters the inner filter cartridge after being filtered by the outer filter cartridge and the inner filter cartridge; a water suction pipe is arranged in the inner filter cartridge, and the end of the water suction pipe away from the inner filter cartridge passes through the top cover and the box body and is connected to the inlet pipe of the water-gas dual-purpose pump, and an air inlet hole is opened on the water suction pipe, and the water suction pipe is used to simultaneously absorb the sewage and gas filtered in the inner filter cartridge.

[0009] Furthermore, a lower box is fixed at the bottom end of the box body, and a waterproof breathable membrane is fixed on the inner wall of the lower box. The waterproof breathable membrane divides the space in the lower box into an air cavity and a water cavity from top to bottom. The outlet pipe of the water-gas dual-purpose pump is connected to the water cavity to discharge the filtered sewage and gas absorbed from the inner filter cartridge into the water cavity, and the gas passes through the waterproof breathable membrane into the air cavity, and the filtered sewage in the water cavity is discharged by a drain pipe installed at the bottom end of the lower box.

[0010] Furthermore, an injection pipe is connected to the top of the fixed hollow disk, and the end of the injection pipe away from the fixed hollow disk passes through the top cover and the rear end of the box body and is connected to the air cavity. The accumulation of gas in the air cavity increases the pressure in the air cavity, and then the processed high-pressure gas in the air cavity enters the processing part and is finally ejected through the injection hole group, thereby realizing gas recycling.

[0011] Furthermore, a slag cleaning mechanism is provided on the top of the recovery chamber, and the slag cleaning mechanism includes a bracket, a rotating wheel and a guide wheel are respectively provided at both ends of the bracket, a wire rope is wound on the rotating wheel, and a hook is installed on the movable end of the wire rope after passing around the guide wheel, a motor device for driving the rotating wheel to rotate and retract and release the wire rope is fixed in the bracket, and a sway cylinder for driving the bracket to swing is fixed at the rear end of the bracket in the box body, and a linear module for driving the sway cylinder and the bracket to move horizontally is fixed at the rear end of the sway cylinder in the box body; a hanging ring is fixed to the outer side of the top end of the top cover, and the hanging ring can lift the top cover, the inner filter cartridge and the processing part after being hung on the hook, so as to clean the waste slag on the recovery chamber, the outer filter cartridge and the inner filter cartridge.

[0012] Furthermore, a mounting plate is fixed to the bottom end of the lower box on one side of the drain pipe, a cleaning door for facilitating opening the recovery chamber is installed at the front end of the box body, and an inspection door for opening the equipment chamber is installed on the side of the box body close to the equipment chamber, and a sewage pump for discharging residual sewage in the recovery chamber is also installed in the equipment chamber.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. During sewage treatment, the gas in the sewage is extracted and recycled after treatment. The gas is sprayed through the L-shaped tube and the jet hole group to the inner and outer filter cartridges to flush out the impurities at the corresponding filter hole positions. The remaining filter holes still play the function of filtering sewage. By changing the position of the L-shaped tube, during sewage treatment, part of the filter holes on the filter cartridge are cleaned while the other part of the filter holes complete the filtering treatment, so that the filter cartridge cleaning and filtering are carried out alternately and synchronously to ensure the treatment effect and efficiency. At the same time, the gas sprayed from the L-shaped tube enters the sewage for the first aeration, and then the sewage is filtered for the first time through the outer filter cartridge, and then the gas aerates the sewage for the second time, and then the sewage is filtered for the second time through the inner filter cartridge and enters the inner filter cartridge. At the same time, the gas enters the inner filter cartridge to aerate the sewage for the third time, realizing the double continuous alternation of filtration and aeration, and improving the sewage treatment effect.

[0014] 2. During the second aeration, the sewage flowing through the inner and outer filter cartridges is diverted by the V-shaped diverter plate and the flow rate is slowed down. At this time, the flow rate of the ejected gas is reduced, which improves the mixing effect of the gas and sewage during the second aeration, improves the aeration effect, and thus improves the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall structure diagram of the present invention; Figure 2 It is an overall cross-sectional view of the present invention; Figure 3 It is a structural diagram of the sewage treatment mechanism of the present invention; Figure 4 It is a cross-sectional view of the sewage treatment mechanism of the present invention; Figure 5For the present invention Figure 4 Enlarged view of part A in the middle; Figure 6 This is a structural diagram of the outer filter cartridge, the inner filter cartridge, the processing part and the top cover of the present invention; Figure 7 It is a cross-sectional view of the processing part of the present invention; Figure 8 It is a top cross-sectional view of the sewage treatment mechanism of the present invention; Fig. 9 For the present invention Figure 8 Enlarged view of middle part B; Fig.10 This is a structural diagram of the V-shaped manifold of the present invention.

[0016] In the accompanying drawings, the names of the components represented by the reference numerals are listed as follows: 1- box body, 2- recovery chamber, 3- equipment chamber; 4- sewage treatment mechanism, 41- outer filter cartridge, 42- inner filter cartridge, 43- treatment part, 44- water suction pipe, 45- top cover, 46- jet pipe, 431- hollow disc, 432- L-shaped pipe, 433- fixed hollow disc, 434- hollow rotating rod, 435- motor, 436- V-shaped diverter plate, 4321- jet hole 1, 4322- jet hole 2, 4323- jet hole 3; 5-water-gas dual-purpose pump, 6-lower box, 61-air cavity, 62-water cavity; 7-waterproof breathable membrane, 8-sewage pump, 9-drain pipe, 10-slag cleaning mechanism, 11-bracket, 12-rotor, 13-wire rope, 14-sway cylinder, 15-linear module, 16-recovery pipe, 17-mounting plate. DETAILED DESCRIPTION

[0017] The preferred specific embodiments for implementing the present invention are described in detail below, and a clear and complete description is made in conjunction with the accompanying drawings.

[0018] See also Figure 1-Figure 2 The present invention provides a water recovery tank for a ship washing vehicle, which is used for recovering sewage generated by the ship washing vehicle when washing ships for treatment, and comprises a box body 1, a mounting plate 17 is fixed to the bottom end of the lower box 6, which is convenient for fixing and installing the box body 1, the interior of the box body 1 is divided into a recovery chamber 2 and an equipment chamber 3, a water-gas dual-purpose pump 5 and a sewage pump 8 are installed in the equipment chamber 3, the water-gas dual-purpose pump 5 is a water pump that can pump both water and air, a cleaning door for facilitating opening the recovery chamber 2 is installed at the front end of the box body 1, and an inspection door for opening the equipment chamber 3 is installed on the side of the box body 1 close to the equipment chamber 3, which is convenient for inspecting the equipment in the equipment chamber 3, and sealing gaskets are installed at the cleaning door and the inspection door to achieve sealing of the box body 1.

[0019] like Figure 2-Figure 6 and Figure 8 As shown, a recovery pipe 16 is provided at the top of the box body 1, and the recovery pipe 16 extends into the recovery chamber 2. The ship washing sewage is injected into the recovery chamber 2 through the recovery pipe 16. A sewage treatment mechanism 4 is provided at the bottom of the recovery chamber 2. The recovery pipe 16 is provided outside the sewage treatment mechanism 4. The sewage treatment mechanism 4 includes an outer filter cartridge 41 and an inner filter cartridge 42 provided inside the outer filter cartridge 41. The top of the inner filter cartridge 42 protrudes outward and is provided at the top of the outer filter cartridge 41. A sealing gasket for sealing the tops of the inner filter cartridge 42 and the outer filter cartridge 41 is provided between the inner filter cartridge 42 and the outer filter cartridge 41. A top cover 45 is fixedly provided at the top of the inner filter cartridge 42. A flow cavity is provided between the inner wall of the outer filter cartridge 41 and the outer wall of the inner filter cartridge 42. The sewage enters the inner filter cartridge 42 after being filtered by the outer filter cartridge 41 and the inner filter cartridge 42. In addition, a water suction pipe 44 is provided in the inner filter cartridge 42. The end of the water suction pipe 44 away from the inner filter cartridge 42 passes through the top cover 45 and the box body 1 and is connected to the inlet pipe of the water-gas dual-purpose pump 5. An air inlet hole is opened on the water suction pipe 44. The bottom end of the water suction pipe 44 extends below the liquid level of the sewage filtered in the inner filter cartridge 42, and the air inlet hole on the water suction pipe 44 is above the liquid level (a liquid level gauge can be installed in the inner filter cartridge 42 to monitor the liquid level, and the liquid level can be controlled by controlling the sewage inlet speed). When the water-gas dual-purpose pump 5 is started, the sewage filtered by the inner filter cartridge 42 and the gas in the sewage are simultaneously sucked into the water suction pipe 44. Due to the discharge of gas in the inner filter cartridge 42, negative pressure is formed in the inner filter cartridge 42, which increases the speed at which water enters the inner filter cartridge 42 through the outer filter cartridge 41 and the inner filter cartridge 42, thereby improving the sewage treatment efficiency.

[0020] like Figure 1-Figure 2 As shown, a lower box 6 is fixed at the bottom end of the box body 1, and a waterproof breathable membrane 7 is fixed on the inner wall of the lower box 6. The waterproof breathable membrane 7 is a thin film material with waterproof function and capable of permeating water vapor. It is usually made of polymer materials, including but not limited to polymer microporous membranes, polyurethane membranes, polytetrafluoroethylene membranes and polyester membranes, etc. It has a microporous structure or a special coating, so that it can prevent moisture from penetrating while allowing gas to pass through. The waterproof breathable membrane 7 divides the space inside the lower box 6 into an air cavity 61 and a water cavity 62 from top to bottom; The outlet pipe of the water-gas dual-purpose pump 5 is connected to the water cavity 62, and the filtered sewage and gas absorbed in the inner filter cartridge 42 are discharged into the water cavity 62. Water is accumulated in the water cavity 62, and the filtered sewage in the water cavity 62 is discharged by the drain pipe 9 installed at the bottom end of the lower box 6. The mounting plate 17 is arranged on one side of the drain pipe 9. The gas passes through the waterproof and breathable membrane 7 and enters the air cavity 61. The pressure in the air cavity 61 increases. The water-insoluble gases contained in the sewage usually include H2S, CH4, C02, CO, N2, NH3, O2, etc.

[0021] Then, if Figure 4 , Figure 6 and Figure 7-10As shown, a processing part 43 is provided in the circulation cavity, and the processing part 43 passes through the bottom of the inner filter cartridge 42 and extends into the inner filter cartridge 42. The processing part 43 includes a hollow disk 431 and a plurality of L-shaped tubes 432 provided in the circulation cavity. The plurality of L-shaped tubes 432 are evenly distributed around the outer side of the hollow disk 431 and are connected to the hollow disk 431. The outer wall of the L-shaped tube 432 is close to the outer filter cartridge 41 and has a plurality of jet holes 4321. A row of jet holes 4321 on an L-shaped tube 432 faces the outer filter cartridge 41. 1, the outer wall of the L-shaped tube 432 close to the inner filter cartridge 42 is provided with a plurality of second jet holes 4322, a row of second jet holes 4322 on an L-shaped tube 432 faces one row of filter holes in the inner filter cartridge 42, the aperture of the first jet hole 4321 is the same as the aperture of the second jet hole 4322, at least one V-shaped splitter plate 436 is fixedly provided between two adjacent L-shaped tubes 432 via a connecting rod, and a plurality of third jet holes 4323 are provided on the outer wall of the L-shaped tube 432 close to the V-shaped splitter plate 436; The processing part 43 also includes a fixed hollow disk 433 fixed to the bottom end of the inner filter cartridge 42, and a hollow rotating rod 434 is fixedly connected to the top of the hollow disk 431. The top of the hollow rotating rod 434 passes through the bottom of the inner filter cartridge 42 and extends into the fixed hollow disk 433. One end of the hollow rotating rod 434 located in the fixed hollow disk 433 is provided with a through hole connected to the interior of the fixed hollow disk 433. The hollow rotating rod 434 is rotatably connected to the fixed hollow disk 433 and the inner filter cartridge 42 through a sealed bearing, and a motor 435 for driving the hollow rotating rod 434 to rotate is fixed to the top of the fixed hollow disk 433, which is used to drive the hollow disk 431, the L-shaped tube 432, and the V-shaped diverter plate 436 to rotate in the flow chamber. Motor 435 can be a stepper motor. A stepper motor is an electric motor that converts an electrical pulse signal into an angular displacement or a linear displacement. It receives a digital control signal (electrical pulse signal) and converts it into a corresponding angular displacement or a linear displacement. It is an actuator that completes digital mode conversion. The required angle, speed and direction can be obtained by controlling the number of pulses, the frequency and the phase sequence of the motor winding. Since motor 435 is in water, motor 435 needs to be a waterproof motor or be waterproofed.

[0022] The top of the fixed hollow disk 433 is connected to a jet pipe 46, and one end of the jet pipe 46 away from the fixed hollow disk 433 passes through the top cover 45 and the rear end of the box body 1 and is connected to the air cavity 61; the gas in the air cavity 61 enters the processing part 43 after being treated, and the treatment here includes pressurization treatment and harmful gas treatment. The pressurization treatment can use a booster pump, gradually reduce the diameter of the jet pipe 46 to increase the gas pressure and other technical means, and the harmful gas treatment can use physical adsorption method, chemical washing method, biological treatment method, photocatalytic oxidation method, ion purification method and other technical means, so that after removing the harmful gas, most of the remaining gas is oxygen. The above means are all existing common technologies and will not be further described here; The treated high-pressure gas in the air cavity 61 enters the processing part 43, and the gas enters the L-shaped tube 432 through the fixed hollow disk 433, the hollow rotating rod 434, and the hollow disk 431, so as to realize the recycling of the gas after treatment, and then the gas is sprayed to the corresponding filter holes of the outer filter cartridge 41 through the jet hole 1 4321, and the impurities outside the filter holes on the outer filter cartridge 41 that are jetted are flushed open, so these filter holes will not be blocked by impurities, and the remaining filter holes on the outer filter cartridge 41 play the function of filtering sewage. Similarly, the gas is sprayed to the corresponding filter holes of the inner filter cartridge 42 through the jet hole 2 4322, and the impurities in the filter holes on the inner filter cartridge 42 that are jetted are flushed open, so these filter holes will not be blocked by impurities, and the remaining filter holes on the inner filter cartridge 42 play the function of filtering sewage. Then, the motor 435 is rotated at a certain angle at a fixed time, driving the hollow rotating rod 434, the hollow disc 431 and the L-shaped tube 432 to rotate so that the L-shaped tube 432 changes position, and washes the impurities on the other filter holes on the outer filter cartridge 41 and the inner filter cartridge 42, that is, during the treatment, a part of the filter holes on the filter cartridge are cleaned while the other part of the filter holes complete the filtering treatment, so that the filter cartridge cleaning and filtering are carried out alternately and synchronously, and the treatment effect and efficiency are guaranteed; At the same time, the gas ejected from the jet hole 1 4321 enters the sewage outside the outer filter cartridge 41 to perform the first aeration on the sewage, and then the sewage is filtered for the first time by the outer filter cartridge 41 and enters between the two L-shaped tubes 432 to be diverted by the V-shaped diverter plate 436, and then the gas in the L-shaped tube 432 is injected into the sewage after the first filtration through the jet hole 3 4323 to perform the second aeration, and the sewage after the second aeration is filtered for the second time by the inner filter cartridge 42 and enters the inner filter cartridge 42, and at the same time, the gas ejected from the jet hole 2 4322 enters the inner filter cartridge 42, and the sewage filtered for the second time is aerated for the third time, so that the double continuous alternation of filtration and aeration is realized, thereby improving the sewage treatment effect; In order to improve the treatment effect, the present invention designs the aperture of the third jet hole 4323 to be larger than the aperture of the first jet hole 4321. Since the smaller the aperture, the faster the gas flow rate under the same gas flow rate, the gas flow rate of the third jet hole 4323 is smaller than the gas flow rates of the first jet hole 4321 and the second jet hole 4322, so as to reduce the gas flow rate during the second aeration. At the same time, the flow rate of the sewage after the first filtration is slowed down under the obstruction of the V-shaped diverter plate 436, thereby improving the mixing effect of the gas and sewage during the second aeration, improving the aeration effect, and thus improving the treatment effect; It is worth mentioning that, in actual use, a one-way valve can be installed on the pipes that need to be anti-reverse as needed to prevent water or gas from flowing back. In particular, a one-way valve needs to be installed in the jet hole 1 4321, the jet hole 2 4322, and the jet hole 3 4323. The one-way valve can prevent sewage from entering the L-shaped pipe 432 under normal conditions, and during processing, the high-pressure gas ejected from the L-shaped pipe 432 can break open the one-way valve and eject outward.

[0023] In order to facilitate the cleaning of the filtered waste residue, such as Figure 2-Figure 4 and Figure 6 As shown, a slag cleaning mechanism 10 is provided at the top of the recovery chamber 2, and the slag cleaning mechanism 10 includes a bracket 11, and a rotating wheel 12 and a guide wheel are respectively provided at both ends of the bracket 11, and a wire rope 13 is wound around the rotating wheel 12. A hook is installed on the movable end of the wire rope 13 after passing around the guide wheel. A motor device for driving the rotating wheel 12 to retract and release the wire rope 13 is fixed in the bracket 11, and a sway cylinder 14 for driving the bracket 11 to swing is fixed at the rear end of the bracket 11 in the box body 1. A sway cylinder can be selected. The sway cylinder is a pneumatic actuator, which is mainly used to realize the rotation or swinging motion of an object. It drives the piston to swing in the cylinder body through the force of compressed air, thereby realizing the swinging operation of the controlled object; and a linear module 15 for driving the sway cylinder 14 and the bracket 11 to move horizontally is fixed at the rear end of the sway cylinder 14 in the box body 1, and a hanging ring is fixed on the outer side of the top of the top cover 45; After the sewage pump 8 has completely drained the residual sewage in the recovery chamber 2, the cleaning door of the box body 1 is opened, and the bracket 11 is driven by the sway cylinder 14 to swing and adjust the height of the hook, and the horizontal position of the hook is adjusted by the linear module 15. After the hook ring is hung on the hook, the motor device can be started to reel in the wire rope 13 to lift the top cover 45, the inner filter cartridge 42 and the processing part 43 away from the outer filter cartridge 41, so that the waste residue inside the recovery chamber 2 and outside the inner filter cartridge 42 can be washed, and the outer filter cartridge 41 can be detachably installed with the inner wall of the bottom of the recovery chamber 2 to facilitate the removal of the outer filter cartridge 41 to clean the waste residue inside it; In addition, at least three hooks and three hanging rings are provided to maintain the stability of the lifting of the top cover 45, the inner filter cartridge 42 and the processing part 43.

[0024] Based on the above content and the accompanying drawings, those skilled in the art can understand and implement the present invention. In addition, any non-creative modifications made to the present invention by those skilled in the art without creative work still fall within the protection scope of the present invention.

Claims

1. A water recovery tank for a ship washing vehicle, comprising a tank body (1), characterized in that: The interior of the box body (1) is divided into a recovery chamber (2) and an equipment chamber (3); a water-gas dual-purpose pump (5) is installed in the equipment chamber (3); and a sewage treatment mechanism (4) is provided at the bottom of the recovery chamber (2); The sewage treatment mechanism (4) comprises an outer filter cartridge (41) and an inner filter cartridge (42) arranged inside the outer filter cartridge (41), a flow cavity is arranged between the inner wall of the outer filter cartridge (41) and the outer wall of the inner filter cartridge (42), and a treatment portion (43) is arranged in the flow cavity, and the treatment portion (43) passes through the bottom of the inner filter cartridge (42) and extends into the interior of the inner filter cartridge (42); The processing section (43) comprises a hollow disc (431) and a plurality of L-shaped tubes (432) arranged in the circulation cavity. The plurality of L-shaped tubes (432) are evenly distributed around the outside of the hollow disc (431) and are in communication with the hollow disc (431). The outer wall of the L-shaped tube (432) is provided with a jet hole group to achieve dual continuous alternating sewage filtration and aeration, and simultaneously achieve alternating and synchronous cleaning of the filter cartridge and filtration.

2. A water recovery tank for a ship cleaning vehicle according to claim 1, characterized in that: At least one V-shaped flow divider plate (436) is fixedly provided between two adjacent L-shaped tubes (432); the jet hole group comprises jet hole one (4321), jet hole two (4322) and jet hole three (4323); the L-shaped tube (432) is provided with a plurality of jet holes one (4321) on the outer wall close to the outer filter cartridge (41); the L-shaped tube (432) is provided with a plurality of jet holes two (4322) on the outer wall close to the inner filter cartridge (42); the L-shaped tube (432) is provided with a plurality of jet holes three (4323) on the outer wall close to the V-shaped flow divider plate (436); the aperture of the jet hole one (4321) is the same as the aperture of the jet hole two (4322); and the aperture of the jet hole three (4323) is larger than the aperture of the jet hole one (4321).

3. A water recovery tank for a ship cleaning vehicle according to claim 1, characterized in that: The processing section (43) further comprises a fixed hollow disk (433) fixed to the bottom end of the inner filter cartridge (42); a hollow rotating rod (434) is fixedly connected to the top end of the hollow disk (431); the top end of the hollow rotating rod (434) passes through the bottom end of the inner filter cartridge (42) and extends into the interior of the fixed hollow disk (433); one end of the hollow rotating rod (434) located in the fixed hollow disk (433) is provided with a through hole connected to the interior of the fixed hollow disk (433); the hollow rotating rod (434) is rotatably connected to the fixed hollow disk (433) and the inner filter cartridge (42); and a motor (435) for driving the hollow rotating rod (434) to rotate is fixed to the top end of the fixed hollow disk (433) to drive the hollow rotating rod (434) to rotate, so as to drive the hollow disk (431), the L-shaped tube (432) and the V-shaped diverter plate (436) to rotate in the flow chamber.

4. A water recovery tank for a ship cleaning vehicle according to claim 3, characterized in that: The top end of the inner filter cartridge (42) protrudes outwards and is covered on the top end of the outer filter cartridge (41), and a top cover (45) is fixedly provided on the top end of the inner filter cartridge (42); A recovery pipe (16) is provided at the top of the box body (1), and the recovery pipe (16) extends into the recovery chamber (2) and is arranged outside the sewage treatment mechanism (4). Ship washing sewage is injected into the recovery chamber (2) through the recovery pipe (16), and the sewage enters the inner filter cartridge (42) after being filtered by the outer filter cartridge (41) and the inner filter cartridge (42); A water suction pipe (44) is provided in the inner filter cartridge (42). One end of the water suction pipe (44) away from the inner filter cartridge (42) passes through the top cover (45) and the box body (1) and is connected to the inlet pipe of the water-gas dual-purpose pump (5). An air inlet hole is provided on the water suction pipe (44). The water suction pipe (44) is used to simultaneously absorb the sewage and gas filtered in the inner filter cartridge (42).

5. A water recovery tank for a ship cleaning vehicle according to claim 4, characterized in that: A lower box (6) is fixed at the bottom end of the box body (1), and a waterproof breathable membrane (7) is fixed on the inner wall of the lower box (6). The waterproof breathable membrane (7) divides the space inside the lower box (6) into an air cavity (61) and a water cavity (62) from top to bottom. The outlet pipe of the water-gas dual-purpose pump (5) is connected to the water cavity (62) to discharge the filtered sewage and gas absorbed from the inner filter cartridge (42) into the water cavity (62). The gas passes through the waterproof breathable membrane (7) and enters the air cavity (61). The filtered sewage in the water cavity (62) is discharged through a drainage pipe (9) installed at the bottom end of the lower box (6).

6. A water recovery tank for a ship cleaning vehicle according to claim 5, characterized in that: The top end of the fixed hollow disk (433) is connected to an injection pipe (46); an end of the injection pipe (46) away from the fixed hollow disk (433) passes through the top cover (45) and the rear end of the box body (1) and is connected to the air cavity (61); gas accumulates in the air cavity (61) so that the pressure in the air cavity (61) increases; then the processed high-pressure gas in the air cavity (61) enters the processing part (43) and is finally ejected through the injection hole group, thereby realizing gas recycling.

7. A water recovery tank for a ship cleaning vehicle according to claim 4, characterized in that: A slag cleaning mechanism (10) is provided at the top of the recovery chamber (2), the slag cleaning mechanism (10) comprising a bracket (11), a rotating wheel (12) and a guide wheel are provided at both ends of the bracket (11), a steel wire rope (13) is wound around the rotating wheel (12), a hook is installed at the movable end of the steel wire rope (13) after passing around the guide wheel, a motor device for driving the rotating wheel (12) to rotate to retract and release the steel wire rope (13) is fixed in the bracket (11), and a sway cylinder (14) for driving the bracket (11) to swing is fixed at the rear end of the bracket (11) in the box body (1), and a linear module (15) for driving the sway cylinder (14) and the bracket (11) to move horizontally is fixed at the rear end of the sway cylinder (14) in the box body (1); A hanging ring is fixed to the outer side of the top end of the top cover (45), and after the hanging ring is hung on the hook, the top cover (45), the inner filter cartridge (42) and the processing part (43) can be lifted to clean the waste residue on the recovery chamber (2), the outer filter cartridge (41) and the inner filter cartridge (42).

8. A water recovery tank for a ship cleaning vehicle according to claim 5, characterized in that: A mounting plate (17) is fixed to the bottom end of the lower box (6) on one side of the drain pipe (9), a cleaning door for facilitating opening of the recovery chamber (2) is installed at the front end of the box body (1), and an inspection door for opening the equipment chamber (3) is installed on the side of the box body (1) close to the equipment chamber (3), and a sewage pump (8) for discharging residual sewage in the recovery chamber (2) is also installed in the equipment chamber (3).

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