A sewage pretreatment device of a ballast water treatment system

Abstract

The application relates to a sewage pretreatment device of a ballast water treatment system and relates to the technical field of sewage pretreatment; the device comprises a water pumping pipe and a filter screen plate, the filter screen plate is arranged in the water pumping pipe, a moving groove is formed in the inner wall of the water pumping pipe along the width direction, the moving groove is located on the side of the filter screen plate close to a sea gate, a moving motor is arranged on the inner wall of the moving groove, a moving lead screw is connected to the output end of the moving motor, a cleaning plate is threadedly connected to the side wall of the moving lead screw, the cleaning plate is attached to the side wall of the filter screen plate, the cleaning plate moves along the length direction of the moving groove, and the moving lead screw is used for cleaning the impurities adhered to the filter screen plate; the application has the effect that the impurities adhered to the surface of the filter screen plate can be conveniently cleaned.

Description

TECHNICAL FIELD

[0001] The application relates to the sewage pretreatment technical field, in particular to a sewage pretreatment device of a ballast water treatment system. BACKGROUND

[0002] The displacement of a cargo ship is different when loading and unloading cargos, in order to ensure the safety of the ship, the ballast water is loaded and discharged according to the loading state of the ship during sailing, so that the ballast water treatment system needs to be installed on the cargo ship. The ballast water treatment system is a device combining filtration and ultraviolet ultrasonic technology to treat seawater. When ballasting, seawater enters the system from the sea door through the ballast pump, first passes through the pretreatment device to filter the larger impurities in the seawater, and then passes through the ultraviolet ultrasonic device to inactivate the microorganisms in the seawater, thereby improving the cleanliness of the seawater.

[0003] In the related art, a sewage pretreatment device is designed, referring to Figure 1 , comprising a water suction pipe 1 and a filter screen plate 11, the filter screen plate 11 is welded to the inner wall of the water suction pipe 1, and the water inlet of the water suction pipe 1 faces one side of the sea door; when the cargo ship sails, seawater enters the inside of the water suction pipe 1 from the sea door through the ballast pump, at this time the filter screen plate 11 filters the larger impurities in the seawater.

[0004] For the related art in the above, the inventors believe that when the water suction pipe extracts seawater, the impurities in the seawater are easy to enter the inside of the water suction pipe together with the seawater, which is easy to cause the phenomenon of impurities blocking the filter screen plate. SUMMARY

[0005] In order to facilitate the cleaning of the impurities adhered to the surface of the filter screen plate, the application provides a sewage pretreatment device of a ballast water treatment system.

[0006] The sewage pretreatment device of the ballast water treatment system provided by the application adopts the following technical scheme:

[0007] A sewage pretreatment device of a ballast water treatment system, comprising a water suction pipe and a filter screen plate, the filter screen plate is arranged in the inside of the water suction pipe, the inner wall of the water suction pipe is provided with a moving groove along the width direction, the moving groove is located at one side of the filter screen plate close to the sea door, the inner wall of the moving groove is provided with a moving motor, the output end of the moving motor is connected with a moving lead screw, the side wall of the moving lead screw is threadedly connected with a cleaning plate, the cleaning plate is attached to the side wall of the filter screen plate, and the cleaning plate moves along the length direction of the moving groove to clean the impurities adhered to the filter screen plate.

[0008] By adopting the above technical scheme, when the sewage pretreatment device is installed on the cargo ship during driving, there are many impurities adhered to the surface of the filter screen plate, which affects the water pumping operation of the water pumping pipe on the sea, the moving motor is started, the moving motor drives the moving lead screw to rotate, so that the cleaning plate moves along the width direction of the water pumping pipe, so that the cleaning plate scrapes the side wall of the filter screen plate during the movement of the cleaning plate, so as to clean the impurities on the filter screen plate. In addition, when the cleaning plate moves until abutting against the inner wall of the water pumping pipe, the impurities on the filter screen plate are accumulated between the cleaning plate and the water pumping pipe, so that the impurities are collected, and the possibility of the impurities floating again under the impact of the subsequent incoming water flow during the water pumping process of the water pumping pipe is reduced.

[0009] As a preferred, the inner wall of the water pumping pipe is provided with a impurity storage groove along the length direction, the inner wall of the impurity storage groove is slidably connected with a push plate along the length direction, so as to discharge the impurities stored in the impurity storage groove to the inside of the water pumping pipe, and a pushing member is arranged in the water pumping pipe, so as to push the push plate to move along the length direction of the inner wall of the impurity storage groove.

[0010] By adopting the above technical scheme, the impurity storage groove is arranged to collect the impurities cleaned by the cleaning plate on the filter screen plate, and when the cleaning plate pushes the impurities to move to the inside of the impurity storage groove, the pushing member is started, the pushing member pushes the push plate to move along the length direction of the impurity storage groove, and the push plate still abuts against the cleaning plate during the movement of the push plate, so as to discharge the impurities to the inside of the water pumping pipe.

[0011] As a preferred, the peripheral wall of the push plate is provided with a flexible pad.

[0012] By adopting the above technical scheme, the flexible pad is arranged to reduce the friction force generated when the push plate slides along the inner wall of the impurity storage groove, and prolong the service life of the push plate.

[0013] As a preferred, the cleaning plate is provided with a shielding plate away from the filter screen plate.

[0014] By adopting the above technical scheme, when the cleaning plate moves and the impurities are accumulated in the impurity storage groove, the shielding plate moves synchronously at this time, so as to shield the opening between the cleaning plate and the impurity storage groove through the shielding plate, and then the possibility of the part of the algae in the dispersed impurities becoming smaller due to the multiple impacts of the subsequent water flow is reduced, so as to pass through the mesh opening of the filter screen plate.

[0015] As a preferred, the inside of the shielding plate is fixedly embedded with a rotating rod, the side away from the filter screen plate of the cleaning plate is provided with a rotating hole for rotating and embedding the rotating rod, the side wall of the rotating rod is sleeved with a torsional spring, one end of the torsional spring is connected to the side wall of the rotating rod, and the other end of the torsional spring is connected to the inner wall of the rotating hole.

[0016] By adopting the technical scheme, the push plate is driven to move by the pushing member, the shielding plate is rotated relative to the shielding plate, and impurities are discharged from inside the water suction pipe.

[0017] Preferably, a tamping plate is arranged on the side of the filter screen plate away from the cleaning plate, a plurality of tamping rods are arranged on the side of the tamping plate close to the filter screen plate, and the tamping rods are used for tamping the mesh holes on the filter screen plate.

[0018] By adopting the technical scheme, the tamping plate is driven to reciprocate along the length direction of the water suction pipe by the reciprocating member, and the tamping rods are synchronously moved during the movement of the tamping plate, so that the mesh holes on the filter screen plate are tamped by the tamping rods, and the possibility of the filter screen plate being blocked by impurities is further reduced.

[0019] Preferably, the reciprocating member comprises a reciprocating motor, a rotating plate, a rotating tooth block, a first rack, a second rack and a first dovetail block, the reciprocating motor is arranged on the inner wall of the water suction pipe, the rotating plate is arranged on the output end of the reciprocating motor, the rotating tooth block is arranged on the side of the rotating plate away from the reciprocating motor, the first rack and the second rack are symmetrically arranged on the tamping plate, the first dovetail block is arranged on the side wall of the tamping plate, and the inner wall of the water suction pipe is provided with a first dovetail groove for the sliding of the first dovetail block along the length direction.

[0020] When the first rack and the rotating tooth block are engaged with each other and the second rack and the rotating tooth block are not engaged with each other, the tamping plate moves towards the side close to the filter screen plate, and when the second rack and the rotating tooth block are engaged with each other and the first rack and the rotating tooth block are not engaged with each other, the tamping plate moves towards the side away from the filter screen plate.

[0021] By adopting the technical scheme, the rotating plate is driven to rotate by the reciprocating motor, so that the rotating tooth block is synchronously rotated, when the rotating tooth block is rotated to be engaged with the first rack, the tamping plate moves towards the side close to the filter screen plate under the limitation of the first dovetail block, so that the tamping plate moves towards the side close to the filter screen plate, and when the rotating tooth block is continuously rotated to be engaged with the second rack, the tamping plate moves towards the side away from the filter screen plate under the limitation of the first dovetail block, so that the tamping plate moves towards the side away from the filter screen plate, thereby driving the tamping plate to reciprocate along the length direction of the water suction pipe.

[0022] As preferred, the tamper plate comprises a connecting plate and a turnover plate, the connecting plate and the turnover plate are rotationally connected, the first dovetail block is arranged on the side wall of the connecting plate, the first rack and the second rack are arranged on the connecting plate, the plurality of tamper rods are arranged on the side wall of the turnover plate, the plurality of water outlet holes are arranged on the side wall of the turnover plate, and the inner wall of the water pumping pipe is provided with a driving member for driving the turnover plate to rotate.

[0023] By adopting the above technical scheme, the turnover member drives the turnover plate to rotate, so that the turnover plate is turned over, thereby reducing the possibility of the tamper plate hindering the water pumping of the water pumping pipe and improving the water pumping efficiency of the water pumping pipe.

[0024] As preferred, the turnover member comprises a turnover motor, a turnover screw rod, a turnover block, a turnover rod, and a second dovetail block, the output end of the turnover motor is connected to the turnover screw rod, one end of the turnover screw rod away from the turnover motor is rotationally connected to the side wall of the connecting plate, the turnover block is threadedly connected to the side wall of the turnover screw rod and moves along the length direction of the water pumping pipe, the turnover rod is rotationally connected to the side wall of the turnover block, one end of the turnover rod away from the turnover block is rotationally connected to the side wall of the turnover plate, the second dovetail block is arranged on the side wall of the turnover motor, and the inner wall of the water pumping pipe is provided with a second dovetail groove along the length direction for the second dovetail block to slide.

[0025] By adopting the above technical scheme, the turnover motor drives the turnover screw rod to rotate, so that the turnover block moves along the length direction of the water pumping pipe, the turnover rod rotates, the turnover plate rotates, and the position adjustment between the turnover plate and the connecting plate is realized.

[0026] As preferred, the side wall of the first dovetail block and the second dovetail block is embedded with a rolling ball.

[0027] By adopting the above technical scheme, the side wall of the first dovetail block and the second dovetail block is embedded with a rolling ball, which effectively reduces the friction generated by the first dovetail block along the inner wall of the first dovetail groove and the second dovetail block along the inner wall of the second dovetail groove, thereby prolonging the service life of the first dovetail block and the second dovetail block.

[0028] In summary, the present application has at least one of the following beneficial technical effects:

[0029] 1. When the sewage pretreatment device is installed on a cargo ship during driving, the surface of the filter screen plate is adhered with more impurities, affecting the water pumping operation of the water pumping pipe to the sea, the moving motor is started, the moving motor drives the moving screw rod to rotate, so that the cleaning plate moves along the width direction of the water pumping pipe, thereby scraping the side wall of the filter screen plate during the movement of the cleaning plate to clean the impurities on the filter screen plate.

[0030] 2. The reciprocating member drives the tamper plate to reciprocate along the length direction of the water suction pipe. The tamper plate drives the tamper rod to move synchronously during the movement, so that the tamper rod tampers the mesh opening on the filter screen plate, thereby further reducing the possibility of the filter screen plate being blocked by impurities. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of a sewage pretreatment device in the related art.

[0032] Figure 2 is a schematic diagram of the overall structure of a sewage pretreatment device of a ballast water treatment system in an embodiment of the present application.

[0033] Figure 3 is a sectional view for embodying the connection relationship between the cleaning plate and the water suction pipe in an embodiment of the present application.

[0034] Figure 4 is a sectional view for embodying the structure of the turnover member in an embodiment of the present application.

[0035] Figure 5 is a schematic diagram for embodying the connection relationship between the cleaning plate and the shielding plate in an embodiment of the present application.

[0036] Figure 6 is a schematic diagram for embodying the structure of the reciprocating member in an embodiment of the present application.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] 1. Water suction pipe; 11. Filter screen plate; 12. Moving groove; 13. Impurity storage groove; 14. Containing groove; 141. Pushing member; 15. Letting slot; 16. First dovetail groove; 17. Second dovetail groove; 2. Moving motor; 21. Moving screw; 22. Cleaning plate; 221. Rotating hole; 3. Pushing plate; 31. Flexible pad; 4. Shielding plate; 41. Rotating rod; 411. Torsion spring; 5. Tamper plate; 51. Connecting plate; 52. Turnover plate; 521. Tamper rod; 522. Water outlet hole; 6. Reciprocating member; 61. Reciprocating motor; 62. Rotating plate; 63. Rotating tooth block; 64. First rack; 65. Second rack; 66. First dovetail block; 7. Turnover member; 71. Turnover motor; 72. Turnover screw; 73. Turnover block; 74. Turnover rod; 75. Second dovetail block; 8. Rolling ball. DETAILED DESCRIPTION

[0039] The following will be described in detail with reference to the accompanying drawings. Figures 2-6 The present application will be further described in detail.

[0040] An embodiment of the present application discloses a sewage pretreatment device of a ballast water treatment system. Referring to Figure 2The sewage pretreatment device comprises a water suction pipe 1 and a filter screen plate 11, and the filter screen plate 11 is welded to the inner wall of the water suction pipe 1.

[0041] With reference to Figure 3 The inner wall of the water suction pipe 1 is provided with a moving groove 12 along the width direction, and the inner wall of the moving groove 12 is connected with a moving motor 2 through bolts, and the moving motor 2 is a waterproof motor in the embodiment of the application; the output end of the moving motor 2 is connected with a moving screw rod 21 through bolts, and the side wall of the moving screw rod 21 is threadedly connected with a cleaning plate 22, so that the cleaning plate 22 moves along the length direction of the moving groove 12.

[0042] With reference to Figure 4 The inner wall of the water suction pipe 1 is provided with a sundry storage groove 13 along the length direction, and the sundry storage groove 13 is located on the side, away from the moving motor 2, of the cleaning plate 22; the bottom wall of the sundry storage groove 13 is provided with an accommodating groove 14 along the length direction, and the accommodating groove 14 is provided with a pushing member 141 inside, and the pushing member 141 is a waterproof air cylinder in the embodiment of the application; one end of the piston rod of the waterproof air cylinder is connected with a push plate 3 through bolts, so that the push plate 3 moves along the length direction of the inner wall of the sundry storage groove 13; the peripheral wall of the push plate 3 is bonded with a flexible pad 31 through glue, and the flexible pad 31 is made of rubber in the embodiment of the application.

[0043] With reference to Figure 3 and Figure 4 When the water suction pipe 1 sucks the seawater in the ocean and the impurities in the seawater are sucked into the inside of the water suction pipe 1 together and the filter screen plate 11 is blocked, the moving motor 2 is started, the moving motor 2 drives the moving screw rod 21 to rotate, so that the cleaning plate 22 moves along the length direction of the moving groove 12, at this time, the end wall of the cleaning plate 22 always adheres to the inner wall of the filter screen plate 11, thereby cleaning the impurities adhered to the surface of the filter screen plate 11 and accumulating the cleaned impurities in the inside of the sundry storage groove 13; then the pushing member 141 drives the push plate 3 to move along the length direction of the sundry storage groove 13, at this time, the push plate 3 always adheres to the side wall of the cleaning plate 22, so as to limit the moving position of the impurities by the cleaning plate 22, thereby discharging the impurities in the sundry storage groove 13 from the inside of the water suction pipe 1.

[0044] With reference to Figure 4 and Figure 5, the rotating hole 221 is arranged on the side of the cleaning plate 22 away from the filter screen plate 11, the inner wall of the rotating hole 221 is rotationally connected with the rotating rod 41, the side wall of the rotating rod 41 is welded with the shielding plate 4, the side wall of the rotating rod 41 is sleeved with the torsion spring 411, in the embodiment of the application, the torsion spring 411 is provided with two, the two torsion springs 411 are symmetrically arranged at the two ends of the rotating rod 41, one end of the torsion spring 411 is welded to the side wall of the rotating rod 41, the other end of the torsion spring 411 is welded to the inner wall of the rotating hole 221. When the impurities on the filter screen plate 11 are accumulated in the impurity storage groove 13 by the movement of the cleaning plate 22, the shielding plate 4 shields the notch of the impurity storage groove 13, thereby improving the stability of the algae plants in the impurity storage groove 13.

[0045] With reference to Figure 4 and Figure 6 , the reciprocating member 6 is arranged in the water suction pipe 1, the reciprocating member 6 comprises a reciprocating motor 61, a rotating plate 62, a rotating tooth block 63, a first rack 64, a second rack 65 and a first dovetail block 66, the inner wall of the water suction pipe 1 is provided with a let-out groove 15 along the width direction, the reciprocating motor 61 is connected to the inner wall of the let-out groove 15 through bolts, the output end of the reciprocating motor 61 is connected to the rotating plate 62, the rotating tooth block 63 is welded to one end of the rotating plate 62 away from the rotating motor, the first rack 64 and the second rack 65 are commonly welded with the tamper plate 5, the tamper plate 5 is located on the side of the filter screen plate 11 away from the cleaning plate 22, a plurality of water outlets 522 are arranged through the side wall of the tamper plate 5, a plurality of tamper rods 521 are welded to the side of the tamper plate 5 close to the filter screen plate 11, so as to tamper the mesh holes on the filter screen plate 11; the first rack 64 and the second rack 65 are symmetrically welded to the two sides of the tamper plate 5, the first dovetail block 66 is welded to the side wall of the tamper plate 5, the side wall of the first dovetail block 66 is embedded with the rolling ball 8, the inner wall of the water suction pipe 1 is provided with the first dovetail groove 16 along the length direction, so as to reduce the friction force generated when the first dovetail block 66 slides along the inner wall of the first dovetail groove 16 through the rolling ball 8.

[0046] With reference to Figure 4 and Figure 6When the second rack 65 is engaged with the first rack 64, the tampering plate 5 moves toward the side close to the filter screen plate 11, so that the tampering rods 521 can tamper with the mesh opening of the filter screen plate 11. When the rotating plate 62 continues to rotate, the rotating gear block 63 and the first rack 64 are out of mesh with each other, and the rotating gear block 63 and the second rack 65 are engaged with each other, the tampering plate 5 synchronously drives the tampering rod 521 to move toward the side away from the filter screen plate 11, thereby through the reciprocating movement of the tampering plate 5, the tampering rod 521 can tamper with the mesh opening of the filter screen plate 11, thereby reducing the possibility of clogging of the filter screen plate 11.

[0047] Reference Figure 4 A flip part 7 is provided in the water suction pipe 1, and the flip part 7 includes a flip motor 71, a flip screw 72, a flip block 73, a flip rod 74, and a second dovetail block 75. In the embodiment of the present application, the flip motor 71 is a waterproof motor; the output end of the flip motor 71 is connected to the flip screw 72, the flip block 73 is threadedly connected to the side wall of the flip screw 72 and moves along the length direction of the water suction pipe 1, and the flip rod 74 is hinged to the side wall of the flip block 73; the second dovetail block 75 is welded to the side wall of the flip motor 71, and the rolling ball 8 is also embedded in the side wall of the second dovetail block 75. The inner wall of the water suction pipe 1 is provided with a second dovetail groove 17 along the length direction for the second dovetail block 75 to slide.

[0048] Reference Figure 4 The tamping plate 5 includes a connecting plate 51 and a flip plate 52, which are rotatably connected to the flip plate 52 by a rotating shaft. The first dovetail block 66 is welded to the side wall of the connecting plate 51, and the end of the flip screw 72 away from the flip motor 71 is rotatably connected to the side of the connecting plate 51 away from the filter screen plate 11 through a bearing seat. The first rack 64 and the second rack 65 are both welded to the connecting plate 51, and several tamping rods 521 are welded to the side wall of the flip plate 52. Several water outlet holes 522 are all opened through the side wall of the flip plate 52, and the end of the flip rod 74 away from the flip block 73 is hinged to the side of the flip plate 52 away from the filter screen plate 11.

[0049] Reference Figure 4 After the surface of the filter screen 11 is cleaned, the flip motor 71 is started to rotate the flip screw 72. At this time, the flip block 73 moves along the length direction of the water pumping pipe 1 toward the side away from the filter screen 11; so that the flip plate 52 rotates relative to the connecting plate 51, thereby reducing the possibility of the tampering plate 5 causing obstruction in the process of extracting seawater from the water pumping pipe 1, thereby improving the pumping efficiency of the water pumping pipe 1 in extracting seawater.

[0050] The implementation principle of the sewage pretreatment device of the ballast water treatment system in the embodiment of the application is as follows: when the surface of the filter screen plate 11 is blocked, the moving motor 2 drives the moving lead screw 21 to rotate, so that the cleaning plate 22 moves along the length direction of the moving groove 12, thereby cleaning the side wall of the filter screen plate 11 through the movement of the cleaning plate 22.

[0051] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: all equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A sewage pretreatment device for a ballast water treatment system, comprising a water pumping pipe (1) and a filter screen (11), wherein the filter screen (11) is arranged inside the water pumping pipe (1), and is characterized in that: The inner wall of the water extraction pipe (1) is provided with a movable groove (12) along the width direction, the movable groove (12) is located on the side of the filter screen plate (11) close to the seabed gate, the inner wall of the movable groove (12) is provided with a movable motor (2), the output end of the movable motor (2) is connected to a movable screw rod (21), the side wall of the movable screw rod (21) is threadedly connected to a cleaning plate (22), the cleaning plate (22) is attached to the side wall of the filter screen plate (11), and the cleaning plate (22) moves along the length direction of the movable groove (12) to clean impurities adhered to the filter screen plate (11); A tampering plate (5) is provided on the side of the filter screen plate (11) away from the cleaning plate (22), and a plurality of tampering rods (521) are provided on the side of the tampering plate (5) close to the filter screen plate (11). The plurality of tampering rods (521) are used to tamper with the mesh on the filter screen plate (11). A reciprocating member (6) is provided in the water pumping pipe (1) to drive the tampering plate (5) to move back and forth along the length direction of the water pumping pipe (1). A plurality of water outlet holes (522) are provided through the side wall of the tampering plate (5); The reciprocating member (6) comprises a reciprocating motor (61), a rotating plate (62), a rotating gear block (63), a first rack (64), a second rack (65), and a first dovetail block (66); the reciprocating motor (61) is arranged on the inner wall of the water pumping pipe (1); the rotating plate (62) is arranged at the output end of the reciprocating motor (61); the rotating gear block (63) is arranged on the side of the rotating plate (62) away from the reciprocating motor (61); the first rack (64) and the second rack (65) are symmetrically arranged on the tampering plate (5); the first dovetail block (66) is arranged on the side wall of the tampering plate (5); and the inner wall of the water pumping pipe (1) is provided with a first dovetail groove (16) for the first dovetail block (66) to slide along the length direction; When the first rack (64) and the rotating tooth block (63) are engaged with each other and the second rack (65) and the rotating tooth block (63) are not engaged with each other, the tamping plate (5) moves toward the side close to the filter screen plate (11); when the second rack (65) and the rotating tooth block (63) are engaged with each other and the first rack (64) and the rotating tooth block (63) are not engaged with each other, the tamping plate (5) moves toward the side away from the filter screen plate (11); The tamping plate (5) comprises a connecting plate (51) and a flip plate (52), wherein the connecting plate (51) and the flip plate (52) are rotatably connected, the first dovetail block (66) is arranged on the side wall of the connecting plate (51), the first rack (64) and the second rack (65) are both arranged on the connecting plate (51), a plurality of tamping rods (521) are all arranged on the side wall of the flip plate (52), a plurality of water outlet holes (522) are all opened through the side wall of the flip plate (52), and a flip member (7) is provided on the inner wall of the water pumping pipe (1) for driving the flip plate (52) to rotate; The flip member (7) comprises a flip motor (71), a flip screw (72), a flip block (73), a flip rod (74), and a second dovetail block (75). The output end of the flip motor (71) is connected to the flip screw (72). The end of the flip screw (72) away from the flip motor (71) is rotatably connected to the side wall of the connecting plate (51). The flip block (73) is threadedly connected to the side wall of the flip screw (72) and moves along the length direction of the water pumping pipe (1). The flip rod (74) is rotatably connected to the side wall of the flip block (73). The end of the flip rod (74) away from the flip block (73) is rotatably connected to the side wall of the flip plate (52). The second dovetail block (75) is arranged on the side wall of the flip motor (71). The inner wall of the water pumping pipe (1) is provided with a second dovetail groove (17) for the second dovetail block (75) to slide along the length direction.

2. The sewage pretreatment device of the ballast water treatment system according to claim 1, characterized in that: The inner wall of the water pumping pipe (1) is provided with a storage tank (13) along the length direction, and the inner wall of the storage tank (13) is slidably connected to a push plate (3) along the length direction, so as to discharge impurities stored in the storage tank (13) into the water pumping pipe (1), and a pushing member (141) is provided in the water pumping pipe (1) for pushing the push plate (3) to move along the length direction of the inner wall of the storage tank (13).

3. The sewage pretreatment device of the ballast water treatment system according to claim 2, characterized in that: A flexible pad (31) is provided on the peripheral wall of the push plate (3).

4. The sewage pretreatment device of the ballast water treatment system according to claim 2, characterized in that: A shielding plate (4) is provided on one side of the cleaning plate (22) away from the filter screen plate (11).

5. The sewage pretreatment device of the ballast water treatment system according to claim 4, characterized in that: A rotating rod (41) is fixedly embedded in the interior of the shielding plate (4); a rotating hole (221) for the rotating rod (41) to be rotatably embedded is provided on a side of the cleaning plate (22) away from the filter screen plate (11); a torsion spring (411) is sleeved on the side wall of the rotating rod (41); one end of the torsion spring (411) is connected to the side wall of the rotating rod (41), and the other end of the torsion spring (411) is connected to the inner wall of the rotating hole (221).

6. The sewage pretreatment device of the ballast water treatment system according to claim 1, characterized in that: The side walls of the first dovetail block (66) and the second dovetail block (75) are both embedded with rolling balls (8).

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