A stepwise progressive settling tank

Abstract

The present application relates to the technical fields of barge water taking and precipitation, and discloses a gradient progressive precipitation tank, which comprises an equipment box body, an A blocking plate and a B blocking plate are sequentially connected in the equipment box body from left to right, an A water distribution pipe, an A pipe clamp and an A pipe clamp bolt are sequentially connected in the equipment box body from left to right. The present application provides a gradient progressive precipitation tank, which has the following beneficial effects: the gradient progressive precipitation overflow precipitation technology is applied; the self-suction pump extracts river water medium and delivers the river water medium to the equipment box body; the gradient separation cavities in the box body; as the water level continuously rises, the inner medium is continuously squeezed out and enters the next cavity for precipitation; the river water medium after the gradient progressive precipitation is continuously supplied to the system; the particles in the box are discharged by the blowdown valve; the fine particles in the gradient progressive precipitation medium support the double-dock external independent water mist sand blasting system; the ship floating on the water surface is realized; after the external independent water taking, the gradient progressive precipitation technology is used to supply the clean river water medium to the water mist sand blasting system.

Description

Technical Field

[0001] The invention relates to the technical field of barge water intake and sedimentation, in particular to a stepped progressive sedimentation box. Background Art

[0002] The sandblasting machine uses the impact and cutting effect of abrasives on the surface of the workpiece to make the surface of the workpiece obtain a certain degree of cleanliness and different roughness, so as to improve the mechanical properties of the workpiece surface. It is widely used in ship repair, general coating and other cleaning of rigid structure surfaces. Taking the unpowered barge as the research object, the external independent water mist sandblasting system technology suitable for double docks is developed, and the barge water mist sandblasting system equipment with environmental protection, intelligence, system integration and efficiency advantages is developed to achieve the goal of environmentally friendly rust removal in double docks and meet the urgent needs of rust removal construction on ships in double docks. The existing constant pressure water supply device transports the liquid to the water collection distributor through a fixed pipeline, and the constant pressure water enters the water mist connection device through the valve system and the bridge hose. Under the action of the pump push pressure, the liquid in the pipe is sprayed and atomized by the water mist spray device, and mixed with the abrasive flowing through to form a water-sand mixture. Under the action of compressed gas, the water-sand mixture continues to jump and roll in the sand pipe and mixes throughout the process until the outlet of the sandblasting gun. However, the existing equipment has stored tap water or industrial water for stored water sandblasting, which is a deficiency of the original equipment. However, in traditional work, it is necessary to frequently replenish water for a single barge to move and replenish water, which is relatively cumbersome and time-consuming. A system is needed to extract external media, gradually precipitate fine particles in the medium, and support double-dock external independent water mist sandblasting technology. Therefore, we proposed a stepped progressive sedimentation box to meet the needs of a sedimentation box that can be used after the external medium is extracted for sedimentation. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the shortcomings of the existing technology, the present invention provides a stepped progressive sedimentation box with the advantages of strong versatility and high stability, which solves the problem that the double-dock external independent water mist sandblasting system technology cannot be self-sufficient in water source.

[0005] (2) Technical solution

[0006] In order to achieve the above-mentioned purpose of barge water intake and sedimentation, the present invention provides the following technical solutions: a stepped progressive sedimentation box, comprising an equipment box body, wherein an A baffle plate and a B baffle plate are sequentially inserted into the interior of the equipment box body from left to right, an A overflow hole is provided on one side of the A baffle plate, a water distribution pipe A is inserted into the interior of the A overflow hole, a pipe clamp is sleeved on the surface of the A water distribution pipe, an A pipe clamp threaded hole is provided on the interior of the A pipe clamp threaded hole, an A pipe clamp bolt is penetrated through the internal thread of the A pipe clamp threaded hole, and the A pipe clamp is threadedly penetrated by the A baffle plate through the A pipe clamp bolt, a water retaining plate is provided on the lower part of one side of the A baffle plate, a B overflow hole is provided on one side of the B baffle plate, a B overflow hole is inserted into the interior of the B overflow hole, a water distribution pipe B is sleeved on the surface of the B water distribution pipe, a B pipe clamp threaded hole is provided on the interior of the B pipe clamp, a B pipe clamp bolt is penetrated through the internal thread of the B pipe clamp threaded hole, and the B pipe clamp is threaded through The B pipe clamp bolt thread penetrates the B baffle plate, and the interior of the equipment box is plugged with a water distribution plate. One side of the equipment box is provided with a water inlet, a flange port, and a water outlet from left to right. One side of the water inlet is provided with a water inlet flange seat, and the interior of the water inlet flange seat is plugged with the water inlet. One side of the flange port is provided with a docking flange seat, and one side of the water outlet is provided with a water outlet flange seat, and the interior of the water outlet flange seat is plugged with the water outlet. One side of the water inlet flange seat is penetrated by an A connecting pipe through the A flange bolt thread, and one end of the A connecting pipe is sleeved with a water inlet stop valve, and one end of the water inlet stop valve is provided with a coarse filter, and one end of the coarse filter is plugged with a self-priming pump, and one end of the self-priming pump is sleeved with a self-closing suction valve, and one side of the water outlet flange is penetrated by a B connecting pipe through the B flange bolt thread, and one side of the B connecting pipe is sleeved with a water outlet stop valve, and one side of the water outlet stop valve is provided with a precision filter.

[0007] Preferably, the coarse filter includes a coarse filter cylinder, a density net, and a coarse filter sealing cover. The coarse filter cylinder is welded to the water inlet shut-off valve and the self-priming pump. The density net is inserted into the interior of the coarse filter cylinder, and the coarse filter sealing cover is threaded through the upper surface of the coarse filter cylinder.

[0008] Preferably, the precision filter includes a precision filter cylinder, a fiber bag, and a precision filter sealing cover. The water outlet shut-off valve and the precision filter cylinder are welded to each other. A fiber bag is inserted into the interior of the precision filter, and a precision filter sealing cover is threaded through the upper surface of the precision filter cylinder.

[0009] Preferably, a bottom plate is passed through the lower surface of the equipment box by bottom plate bolt threads.

[0010] Preferably, bottom plate bolts are evenly distributed around the lower surface of the equipment box, a drain port is provided inside the bottom plate, and a drain valve is passed through the internal thread of the drain port.

[0011] Preferably, a fixed ladder is inserted into the interior of the equipment box.

[0012] Preferably, the upper surface of the equipment box body is penetrated by the cover plate through the cover plate bolt thread, the surface of the cover plate is provided with a fixing threaded hole, the internal thread of the fixing threaded hole is penetrated by the water distribution plate bolt, and the cover plate is penetrated by the water distribution plate bolt thread.

[0013] Preferably, cover bolts are evenly distributed around the upper surface of the equipment box, a lifting ring is provided on the upper surface of the cover, and a support frame is provided on the lower surface of the base plate.

[0014] Preferably, a water inlet baffle is provided inside the equipment box, and a float switch is clamped inside the equipment box.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention provides a stepped progressive sedimentation box with the following beneficial effects:

[0017] The stepped progressive sedimentation box applies the stepped progressive sedimentation overflow sedimentation technology; a self-priming pump draws river water media and transports it to the equipment box. The stepped compartments in the box, as the water level continues to rise, the river water media is continuously squeezed into the next chamber for sedimentation. The river water media continuously supplies the system with progressive sedimentation, and the particles settled in the box are discharged by the drain valve. The fine particles in the progressive sedimentation medium support the double-dock external independent water mist sandblasting system, which plays the role of a ship floating on the water. After the external independent water intake, the clean river water medium is supplied to the system for water mist sandblasting through the stepped progressive sedimentation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a stepped progressive sedimentation box proposed by the present invention;

[0019] Figure 2 This is a schematic diagram of the barrier plate structure of a stepped progressive sedimentation box A proposed by the present invention;

[0020] Figure 3 This is a schematic diagram of the barrier plate structure of a stepped progressive sedimentation box B proposed by the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of a stepped progressive sedimentation box device proposed by the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of a stepped progressive sedimentation box water inlet flange seat proposed by the present invention;

[0023] Figure 6This is a schematic diagram of the structure of a stepped progressive sedimentation tank outlet flange seat proposed by the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the cover and bottom plate of a stepped progressive sedimentation box proposed by the present invention;

[0025] Figure 8 This is a cross-sectional view of a stepped progressive sedimentation box proposed by the present invention;

[0026] Figure 9 This is a top view of a stepped progressive sedimentation box proposed by the present invention.

[0027] In the figure: 1. Equipment box; 2. Baffle A; 3. Baffle B; 4. Water distribution pipe A; 5. Pipe clamp A; 6. Pipe clamp bolt A; 7. Water retaining plate A; 8. Water distribution pipe B; 9. Pipe clamp B; 10. Pipe clamp bolt B; 11. Water distribution plate; 12. Water inlet flange; 13. Water inlet; 14. Connecting flange; 15. Water outlet flange; 16. Water outlet; 17. Flange bolt A; 18. Connecting pipe A; 19. Water inlet stop valve; 20. Coarse filter; 2001. Coarse filter cylinder; 2002. Density net; 20 03. Coarse filter sealing cover; 21. Self-priming pump; 22. Self-closing suction valve; 23. B flange bolts; 24. B connecting pipe; 25. Water outlet stop valve; 26. Precision filter; 2601. Precision filter cylinder; 2602. Fiber bag; 2603. Precision filter sealing cover; 27. Bottom plate bolts; 28. Bottom plate; 29. ​​Drain valve; 30. Fixed ladder; 31. Cover plate bolts; 32. Cover plate; 33. Water distribution plate bolts; 34. Lifting ring; 35. Support frame; 36. Water inlet baffle; 37. Float switch. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-9A step-by-step sedimentation box includes an equipment box body 1, wherein an A baffle plate 2 and a B baffle plate 3 are sequentially inserted from left to right inside the equipment box body 1, an A overflow hole is provided on one side of the A baffle plate 2, an A water distribution pipe 4 is inserted inside the A overflow hole, an A pipe clamp 5 is sleeved on the surface of the A water distribution pipe 4, an A pipe clamp threaded hole is provided inside the A pipe clamp 5, an A pipe clamp bolt 6 is passed through the internal thread of the A pipe clamp threaded hole, the A pipe clamp 5 is threadedly penetrated by the A pipe clamp bolt 6 through the A baffle plate 2, an A water retaining plate 7 is provided on the lower part of one side of the A baffle plate 2, and an A baffle plate 3 is provided on one side. There is a B overflow hole, the B overflow hole is plugged with a B water distribution pipe 8, the surface of the B water distribution pipe 8 is sleeved with a B pipe clamp 9, the B pipe clamp 9 is provided with a B pipe clamp threaded hole, the internal thread of the B pipe clamp threaded hole is penetrated by a B pipe clamp bolt 10, the B pipe clamp 9 is penetrated by a B baffle plate 3 through the B pipe clamp bolt 10 thread, the interior of the equipment box 1 is plugged with a water distribution plate 11, and one side of the equipment box 1 is provided with a water inlet, a flange port, and a water outlet from left to right. A water inlet flange seat 12 is provided on one side of the water inlet, and a water inlet 13 is plugged into the interior of the water inlet flange seat 12. One side of the flange port A docking flange seat 14 is provided, a water outlet flange seat 15 is provided on one side of the water outlet, a water outlet 16 is plugged into the inside of the water outlet flange seat 15, and an A connecting pipe 18 is threaded through the A flange bolt 17 on one side of the water inlet flange seat 12. One end of the A connecting pipe 18 is sleeved with a water inlet stop valve 19, and one end of the water inlet stop valve 19 is provided with a coarse filter 20. One end of the coarse filter 20 is plugged with a self-priming pump 21, and one end of the self-priming pump 21 is sleeved with a self-closing suction valve 22. A B connecting pipe 24 is threaded through the B flange bolt 23 on one side of the water outlet flange 15, and the B connecting pipe 24 is threaded through the B flange bolt 23. One side of the pipe 24 is sleeved with a water outlet shut-off valve 25, and one side of the water outlet shut-off valve 25 is provided with a precision filter 26. Taking the unpowered barge as the research object, the external independent water mist sandblasting system technology suitable for the double dock is developed, and the barge water mist sandblasting system equipment with the advantages of environmental protection, intelligence, system integration and efficiency is developed to achieve the goal of environmentally friendly rust removal of the double dock and meet the urgent needs of ship rust removal construction in the double dock. The existing constant pressure water supply device transports the liquid to the water collection distributor through a fixed pipeline, and the constant pressure water enters the water mist connection device through the valve system and the bridge hose. Under the action of the pump push pressure, the liquid in the pipe is sprayed and atomized by the water mist injection device, and mixed with the abrasive flowing through to form a water-sand mixture. Under the action of compressed gas, the water-sand mixture continues to jump and roll in the sand pipe and mixes throughout the process until it reaches the outlet end of the sandblasting gun. However, the original sandblasting barge is 38,000 mm long, 10,000 mm wide, and 1,740 mm high, and is equipped with two 0.75m 3The equipment includes a sandblasting cylinder, two air storage drums, and two 45kW air compressors, capable of operating two dry blasting guns. Derusting ship hulls using barges to house dry blasting equipment and abrasive delivery systems is inefficient. During rust removal, large amounts of crushed abrasive dust are generated. Under certain wind conditions, the dust can spread over an area several kilometers around the dock, severely damaging air quality and causing significant disruption to residents near the shipyard. The scattered dust also poses a threat to the surrounding waters and ecological environment. Therefore, research into independent water mist blasting system technology is necessary. However, conventional water mist blasting systems typically rely on a reserve water source for blasting, making it impossible to use river water. Although the river's sediment content is low, making it a low-sediment stream, it is plentiful, with approximately 1 trillion cubic meters of water flowing into the sea annually. Consequently, the total sediment load is significant. Sediment in the river primarily originates from upstream, with 90% of the total sediment load concentrated during the flood season. The Yichang section experiences the highest sediment load. The average sediment content at the Yichang Hydrological Station from 1950 to 2000 was about 1.14 kg / m3. The current annual sediment transport volume is 500 million tons. Direct use of river water would also result in coarse sand clogging the equipment. Therefore, the designed sedimentation tank can effectively prevent the coarse sand in the river water from damaging and clogging the equipment. The water quality after sedimentation in this cascade progressive sedimentation tank meets the water quality requirements: > industrial water < drinking water.

[0030] The self-closing suction valve 22 enters the water, and the surrounding floating materials are blocked. The remaining floating materials are washed away by the turbulent river water and enter the equipment box through the self-priming pump 21. This device uses a 50BZ / 25 self-priming pump: caliber - 50, power - 2.2KW, head - 25M, flow - 10m 3 / h; the river water extracted by the self-priming pump 21 passes through the density mesh 2002 inside the coarse filter 20, and the coarse sand is filtered, the fineness modulus is 3.7 to 3.1, the particle size greater than 0.5mm contains more than 50% of the total weight, and the average particle size is 1mm to 0.5mm of sand and gravel.

[0031] The A baffle plate 2 and the B baffle plate 3 plugged into the equipment box 1 divide the equipment box into three areas, namely the first chamber, the second chamber and the third chamber. The self-priming pump 21 draws water from the Yangtze River through the suction pipe. The coarse sand modulus of the river water medium is 3.7-3.1 after being filtered by the coarse filter 20. The average particle size of the river water medium is 1mm-0.5mm. The river water medium carries the remaining sand into the first chamber. The medium sand modulus of the river water medium is 3.0-2.3. The particles with a particle size greater than 0.25mm are pushed by the self-priming pump 2 through the water inlet 13 Entering the first chamber, at the same time, an inlet baffle 36 is provided below the water inlet position of the water inlet 13 to prevent the water pressure in the first chamber from being too high and directly impacting the bottom plate 28 to cause rust and impact deformation. The river water medium is constantly churning in the first chamber, and the large particles of sand and gravel are deposited at the sewage outlet position waiting to open the sewage valve 29. The water level in the first chamber continues to rise through the A water distribution pipe 4, and the fine sand in the river water medium flows into the second chamber. A water baffle 7 is provided at the water outlet position of the A water distribution pipe 4 to prevent the water pressure in the first chamber from being too high and directly impacting the bottom plate 28 to cause rust and impact deformation. In this case, after the river water medium passes through the second chamber, it is transported into the third chamber through the B water distribution pipe 8. As the transportation distance becomes longer and the resistance increases, the pump push pressure and flow rate both decrease, and the sand and gravel carried by the river water medium enter the pressure stabilizing chamber. It is worth noting that the stable chamber here is not separated separately, but is divided on both sides of the equipment box 1 through the water distribution plate 11. At the same time, a water hole is opened in the upper part of the water distribution plate, and the lower part becomes a pressure stabilizing chamber. In the pressure stabilizing chamber of the third chamber, the shock wave and churning force of the river water medium are greatly weakened, and the river water medium tends to be stable, with a fineness modulus of 2.2 to 1.6. Particles with a particle size greater than 0.075 mm and sand particles in the river water medium are settled, and the fine sand is discharged through the sewage outlet at the bottom of the pressure-stabilizing chamber. Therefore, the water level of the outlet 16 is upward to prevent the settled sand particles from entering the outlet 16. The float switch 37 provided in the third chamber is connected to the self-priming pump 21. The self-priming pump 21 is controlled by the degree of increase of the river water medium inside the equipment box 1. The float switch 37 is a simple structure and an easy-to-use liquid level control device. It does not require power supply and has no complex circuit. It has the advantages of being smaller in size and having a longer working life than a general mechanical switch.When selecting the model, as long as the material is selected correctly, any liquid or pressure and temperature can be used. It has been widely used in shipbuilding industry, generator equipment, petrochemical industry, food industry, water treatment equipment, dyeing and finishing industry, hydraulic machinery and other aspects. The river water medium that has been precipitated and sanded is passed through the equipment box 1 with three chambers. After being filtered again by the fiber bag 2602 inside the precision filter 26, the clean river water medium enters the constant pressure water supply system. After being pressurized, it is used for water mist sandblasting machine, ensuring the stable operation of the constant pressure water supply system. After the operation is completed, when entering the maintenance process, the cover 21 can be opened to enter the equipment box 1. The fixed ladder 30 inside can allow maintenance personnel to enter the three chambers of the equipment box 1, and the device can also be hoisted and moved as a whole through the lifting ring 34.

[0032] The electrical components mentioned in this article are all connected to an external main controller and 220V AC power, and the main controller can be a conventional known device that performs control such as a computer.

[0033] During use, the self-priming pump 21 draws water from the Yangtze River through a suction pipe, filters the river water medium through a coarse filter 20, and enters the first chamber through the water inlet 13. At the same time, a water inlet baffle 36 is provided below the water inlet position of the water inlet 13 to prevent excessive water pressure in the first chamber from directly impacting the bottom plate 28 and causing rust and impact deformation. The river water medium keeps churning in the first chamber, and large particles of sand and gravel are deposited at the sewage outlet position waiting to open the sewage valve 29. The water level in the first chamber continues to rise through the A water distribution pipe 4, and the fine sand in the river water medium flows into the second chamber and undergoes secondary sedimentation in the second chamber. After the river water medium passes through the second chamber, it is transported into the third chamber through the B water distribution pipe 8. Due to the increase in resistance due to the longer transportation distance, the pump push pressure and flow rate both decrease. The sand and gravel carried by the river water medium enter the pressure stabilizing chamber. A water hole is provided in the upper part of the water distribution plate, and the lower part becomes a pressure stabilizing chamber. In the pressure stabilizing chamber of the third chamber, The shock wave and churning force of the river water medium are greatly weakened, the river water medium tends to be stable, the sand particles in the river water medium are settled, and the fine sand is discharged through the sewage outlet at the bottom of the pressure-stabilizing chamber. Therefore, the water level of the outlet 16 is upward to prevent the settled sand particles from entering the outlet 16. The float switch 37 arranged in the third chamber is connected to the self-priming pump 21, and the self-priming pump 21 is controlled by the degree of increase of the river water medium inside the equipment box 1. The river water medium that has been precipitated and de-sanded by the equipment box 1 with three chambers is filtered again by the fiber bag 2602 inside the precision filter 26, and the clean river water medium enters the constant pressure water supply system. After the operation is completed, when entering the maintenance process, the cover 21 can be opened to enter the equipment box 1. The fixed ladder 30 inside can allow maintenance personnel to enter the three chambers of the equipment box 1, and the device can also be hoisted and moved as a whole through the lifting ring 34.

[0034] To sum up, the stepped progressive sedimentation box applies the stepped progressive sedimentation overflow sedimentation technology; the self-priming pump 21 extracts the river water medium and transports it to the equipment box 1. In the stepped compartment inside the box, as the water level continues to rise, the river water medium is continuously squeezed into the next chamber for sedimentation. After the progressive sedimentation river water medium continuous supply system, the particles precipitated in the box are discharged by the sewage valve 29, which acts as a boat floating on the water surface. After external independent water intake, the clean river water medium supply system is subjected to water mist sandblasting through the stepped progressive sedimentation technology.

[0035] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A step-by-step sedimentation box, comprising a device box (1), characterized in that: The interior of the equipment box (1) is sequentially connected with an A baffle plate (2) and a B baffle plate (3) from left to right. An overflow hole A is provided on one side of the A baffle plate (2). A water distribution pipe (4) is connected to the interior of the A overflow hole. An A pipe clamp (5) is sleeved on the surface of the A water distribution pipe (4). An A pipe clamp threaded hole is provided on the interior of the A pipe clamp threaded hole. An A pipe clamp bolt (6) is passed through the internal thread of the A pipe clamp threaded hole. The A pipe clamp (5) is threadedly passed through the A baffle plate (2) via the A pipe clamp bolt (6). An A water retaining plate (7) is provided on the lower part of one side of the A baffle plate (2). An overflow hole B is provided on one side of the B baffle plate (3). The B overflow hole is plugged with a B water distribution pipe (8), the surface of the B water distribution pipe (8) is sleeved with a B pipe clamp (9), the B pipe clamp threaded hole is provided inside the B pipe clamp (9), the internal thread of the B pipe clamp threaded hole is penetrated by a B pipe clamp bolt (10), the B pipe clamp (9) is threadedly penetrated by a B baffle plate (3) through the B pipe clamp bolt (10), the inside of the equipment box (1) is plugged with a water distribution plate (11), one side of the equipment box (1) is provided with a water inlet, a flange port, and a water outlet from left to right, one side of the water inlet is provided with a water inlet flange seat (12), the inside of the water inlet flange seat (12) is plugged with a water inlet (13), the A docking flange seat (14) is provided on one side of the flange port, a water outlet flange seat (15) is provided on one side of the water outlet, a water outlet (16) is plugged into the interior of the water outlet flange seat (15), an A connecting pipe (18) is threadedly penetrated through one side of the water inlet flange seat (12) via an A flange bolt (17), one end of the A connecting pipe (18) is sleeved with a water inlet stop valve (19), one end of the water inlet stop valve (19) is provided with a coarse filter (20), one end of the coarse filter (20) is plugged with a self-priming pump (21), one end of the self-priming pump (21) is sleeved with a self-closing suction valve (22), one side of the water outlet flange seat (15) is threaded through a B method The blue bolt (23) is threadedly penetrated by a B connecting pipe (24), a water outlet stop valve (25) is sleeved on one side of the B connecting pipe (24), and a precision filter (26) is provided on one side of the water outlet stop valve (25); the coarse filter (20) comprises a coarse filter cylinder (2001), a density net (2002), and a coarse filter sealing cover (2003); the coarse filter cylinder (2001) is welded to the water inlet stop valve (19) and the self-priming pump (21); the density net (2002) is inserted into the interior of the coarse filter cylinder (2001), and the coarse filter sealing cover (2003) is threadedly penetrated on the upper surface of the coarse filter cylinder (2001);The precision filter (26) includes a precision filter cylinder (2601), a fiber bag (2602), and a precision filter sealing cover (2603). The water outlet stop valve (25) and the precision filter cylinder (2601) are welded to each other. The fiber bag (2602) is inserted into the interior of the precision filter cylinder (2601). The precision filter sealing cover (2603) is threadedly penetrated on the upper surface of the precision filter cylinder (2601). The bottom surface of the equipment box (1) is threadedly penetrated by a bottom plate (28) via a bottom plate bolt (27).

2. The step-by-step sedimentation tank according to claim 1, characterized in that: Twenty-eight bottom plate bolts (27) are evenly distributed around the lower surface of the equipment box (1), a sewage outlet is provided inside the bottom plate (28), and a sewage valve (29) is passed through the internal thread of the sewage outlet.

3. The step-by-step sedimentation tank according to claim 1, characterized in that: A fixed ladder (30) is inserted into the interior of the equipment box (1).

4. The step-by-step sedimentation tank according to claim 1, characterized in that: The upper surface of the equipment box (1) is threadedly penetrated by a cover plate (32) through a cover plate bolt (31), a fixing threaded hole is provided on the surface of the cover plate (32), an internal thread of the fixing threaded hole is threadedly penetrated by a water distribution plate bolt (33), and the cover plate (32) is threadedly penetrated by a water distribution plate bolt (33) through the water distribution plate bolt (33).

5. The step-by-step sedimentation box according to claim 1, characterized in that: Twenty-eight cover bolts (31) are evenly distributed around the upper surface of the equipment box (1), a lifting ring (34) is provided on the upper surface of the cover (32), and a support frame (35) is provided on the lower surface of the base plate (28).

6. The step-by-step sedimentation tank according to claim 1, characterized in that: A water inlet baffle (36) is provided inside the equipment box (1), and a float switch (37) is clamped inside the equipment box (1).

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