Single-pump construction transformation method for deck pump of large cutter suction dredger

Abstract

The invention discloses a large cutter suction dredger deck pump single pump construction transformation method, and belongs to the technical field of dredging engineering. The invention discloses a single-pump construction transformation method for a deck pump of a large cutter suction dredger. The method comprises the following steps: S1, adding a gate valve system and optimizing signals; s2, pipeline optimization and water sealing control; and S3, electrical control logic is reconstructed, and the specific operation of adding the gate valve system in the step S1 is as follows: a worker firstly organizes to disassemble mud pipes connected with the front part and the rear part of the underwater pump, an underwater pump body and a gear box are disassembled, and a space is reserved for subsequent installation of the gate valve system; through the technical transformation, the construction efficiency of the single pump is effectively improved, the service life of equipment is guaranteed, the risk of pump combination failure is avoided, meanwhile, the adverse situation that a ship stops working and production due to the fact that an underwater pump cannot be used and a single deck pump cannot be constructed before technical transformation is effectively prevented, and therefore it is guaranteed that the overall progress of a project is well operated.

Description

Technical Field

[0001] The invention relates to the technical field of dredging engineering, in particular to a single-pump construction and transformation method for a large-scale cutter suction vessel deck pump. Background Art

[0002] In existing technology, cutter suction dredgers typically use a three-pump system (two deck dredgers + one underwater dredger) for dredging operations. Whether to use three or two pumps depends on the blowing distance. The main form of single-pump operation for cutter suction dredgers is single underwater pump operation. In this mode, the underwater pump is submerged below the waterline, allowing for both suction and discharge of mud and sand. However, in certain operating conditions (such as shallow waters, low-intensity dredging, or when the underwater pump fails), it is necessary to switch to a single deck pump operation mode.

[0003] Traditional single-deck pump construction has the following defects: 1. Insufficient suction: During single-deck pump construction, the deck pump is too far away from the suction port, resulting in insufficient suction at startup and inability to effectively suck out mud and sand; 2. Cavitation and vibration: The deck pump is far and high from the suction port, which can easily cause empty suction and failure to pump water, resulting in cavitation and abnormal vibration of the mud pump, shortening the life of the equipment; 3. Inefficiency: There is a lack of standardized technical transformation plans, temporary transformation is time-consuming, and the pipeline connection is unstable, affecting construction continuity; 4. Signal control defects: The gate valve opening and closing signal feedback is incompatible with the hydraulic system, resulting in a high risk of pump failure. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a single pump construction and reconstruction method for a large cutter suction vessel deck pump.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A single-pump construction and reconstruction method for a large-scale cutter suction vessel deck pump comprises the following steps:

[0007] S1: Gate valve system installation and signal optimization;

[0008] S2: Pipeline optimization and water sealing control;

[0009] S3: Electrical control logic reconstruction.

[0010] Preferably, the specific operation of installing the gate valve system in step S1 is as follows:

[0011] The staff first organized to dismantle the mud pipes connecting the front and rear of the submersible pump, and removed the submersible pump body and gear box (the submersible pump gear box was damaged and needed to be repaired), leaving space for the subsequent installation of the gate valve system;

[0012] A gate valve system was installed at the front end of the original underwater pump. The distance from the gate valve system to the suction port of the dredging pipeline was 15m to ensure that the gate valve could be submerged below the waterline after the bridge was lowered. The gate valve operating switch was extended to the bridge.

[0013] The deck suction water supply gate valve is removed from the ship and used as the suction gate valve.

[0014] Preferably, the signal optimization described in step S1 specifically comprises the following operations: signal feedback improvement;

[0015] The 4-core signal line of the original suction gate valve at the end of the bridge is extended to the gate valve system, and the opening and closing signal feedback is realized by using the PNP proximity switch, and the status is displayed through the indicator light on the driving console.

[0016] Preferably, the pipeline optimization operation steps described in step S2 are as follows:

[0017] Design the dredging pipeline route and install a new mud pipe to connect the gate valve system to the deck pump. During this process, make good use of the existing mud pipe and adjust the mud pipe route by adding elbows and cutting the mud pipe to recalibrate the welding flange to connect the deck pump to the suction port.

[0018] The water sealing control operation steps described in step S2 are as follows:

[0019] The staff lowered the auger to 5 meters below the waterline;

[0020] Close the gate valve, notify the mud pump to start sealing water, and add sealing water into the mud pipe for 30 minutes. At this time, the front end of the deck pump is full of water;

[0021] The staff starts the deck pump and opens the gate valve within 2-3 seconds. After completing the pump closing operation, dredging construction can be carried out.

[0022] Preferably, the electrical control logic reconstruction step described in step S3 is as follows:

[0023] Connect the hydraulic vacuum release valve signal line to the bridge gate valve solenoid valve, and control the gate valve action through the oil cylinder linkage;

[0024] Add a manual short-circuit switch to solve the pump closing failure caused by signal conflict.

[0025] Preferably, the dredging pipeline includes a number of interconnected pipes, and the several pipes are sequentially arranged as a sediment suction pipe, a variable flange connection steel pipe, a new steel mud pipe, a bent steel pipe fitting, an armored climbing hose (because there is a steel ring inside the armored hose, the use of the armored hose will not cause large suction during construction, collapse and deformation inside the hose, and cause the suction port to become smaller) and a deck steel pipe. The end of the deck steel pipe away from the armored climbing hose is connected to the deck pump. The bent steel pipe fitting consists of two 25-degree bent steel pipes and one 15-degree bent steel pipe. The gate valve system is arranged between the variable flange connection steel pipe and the bent steel pipe fitting. The gate valve system includes a gate valve body, and the vacuum release valve is arranged at the suction end of the sediment suction pipe.

[0026] Preferably, the mud suction pipe, variable flange connecting steel pipe, new steel mud pipe, bent steel pipe fittings, armored climbing hose, deck steel pipe and both ends of the gate valve body are equipped with pipe positioning brackets to prevent vibration and displacement during construction.

[0027] Preferably, the mud suction pipe, variable flange connecting steel pipe, new steel mud pipe, bent steel pipe fittings, armored climbing hose, deck steel pipe and both ends of the gate valve body are respectively provided with a first flange and a second flange, and the first flange and the second flange are both provided with an annular groove, and a sealing gasket is provided in the annular groove, and each of the first flanges is provided with a positioning portion for positioning the second flange adjacent to it.

[0028] Preferably, the positioning part includes an electric push rod fixed on the first flange, an annular plate arranged at the movable end of the electric push rod, a plurality of side plates evenly arranged on the outside of the annular plate, a rotating rod rotatably connected to the side plate, and an abutment plate arranged at the end of the rotating rod away from the side plate, the abutment plate is movably abutted against the second flange, a positioning rod is fixed on the first flange, and a positioning hole matching the positioning rod is opened on the second flange.

[0029] Preferably, a fixing tube is fixedly provided on the outer side of the first flange, a guide block is fixedly provided on the inner side wall of the fixing tube, and a track groove is provided on the rotating rod for sliding cooperation with the guide block, and the track groove includes a spiral groove and a straight groove connected to each other.

[0030] Compared with the existing technology, the present invention provides a single-pump construction and reconstruction method for a large-scale cutter suction vessel deck pump, which has the following beneficial effects:

[0031] 1. This single-pump deck pump renovation method for large-scale cutter suction vessels improves the suction and discharge efficiency of the deck pump in single-pump mode, ensuring controllable mud concentration, by adding a gate valve system and optimizing signals, optimizing pipelines and water sealing control, and reconstructing electrical control logic. It also reduces cavitation and equipment vibration, extending the service life of key components. It also establishes a standardized technical renovation process to shorten emergency renovation time, resolves compatibility issues between gate valve signal feedback and the control system, and ensures construction safety. This prevents adverse ship shutdowns caused by the inability to use underwater pumps and the inability to operate the single deck pump before the technical renovation, ensuring the overall smooth progress of the project.

[0032] 2. This single-pump construction and modification method for a large-scale cutter suction vessel deck pump provides a positioning portion on the first flange for positioning the second flange adjacent thereto, replacing the method of fixing the two flanges by screwing multiple bolts. The operation is simple and quick, and avoids the phenomenon of unstable connection between flanges caused by loosening of bolts during long-term use due to bolt connection, thereby improving the pipeline connection efficiency and the stability between the flanges. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the dredging pipeline of the present invention;

[0034] Figure 2 A schematic diagram of the connection structure of the first flange and the second flange of the present invention;

[0035] Figure 3 It is a schematic diagram of the cross-sectional structure of the first flange and the second flange of the present invention;

[0036] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of the middle part A;

[0037] Figure 5 Schematic diagram of the external structure of the first flange of the present invention;

[0038] Figure 6 Schematic diagram of the structure of the rotating rod of the present invention.

[0039] In the figure: 1. Dredging pipeline; 101. Sediment suction pipe; 1011. Vacuum release valve; 102. Variable flange connecting steel pipe; 103. New steel mud pipe; 104. Bent steel pipe fittings; 105. Armored climbing hose; 106. Deck steel pipe; 107. Gate valve body; 108. Pipe positioning bracket; 2. First flange; 201. Positioning rod; 3. Second flange; 301. Positioning hole; 4. Annular groove; 401. Sealing gasket; 5. Electric push rod; 501. Annular plate; 502. Side plate; 503. Rotating rod; 504. Abutment plate; 6. Fixed pipe; 601. Guide block; 7. Track groove; 701. Spiral groove; 702. Straight groove. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example: Refer to Figure 1 A single pump construction and reconstruction method for a large cutter suction vessel deck pump comprises the following steps:

[0044] S1: Gate valve system installation and signal optimization;

[0045] S2: Pipeline optimization and water sealing control;

[0046] S3: Electrical control logic reconstruction.

[0047] Furthermore, the specific operation of installing the gate valve system described in step S1 is as follows:

[0048] First, the staff organized to dismantle the mud pipes connecting the front and rear of the underwater pump, remove the underwater pump body and gear box, and leave space for the subsequent installation of the gate valve system;

[0049] Second, install a gate valve system at the front end of the original underwater pump. The distance from the gate valve system to the suction port of dredging pipeline 1 is 15m. Ensure that the gate valve can be submerged below the waterline after the bridge is lowered. Extend the gate valve operating switch to the bridge.

[0050] 3. Remove the deck suction and water supply gate valve from the ship and use it as the suction gate valve to prevent the suction pipe from being unable to store water and being sucked empty.

[0051] Furthermore, the signal optimization described in step S1 specifically performs the following operations: signal feedback improvement;

[0052] Extend the 4-core signal line of the original suction gate valve at the end of the bridge to the gate valve system, use the PNP proximity switch to realize the opening and closing signal feedback, ensure watertightness, and the gate valve opening and closing signal status is displayed through the indicator light on the console.

[0053] Furthermore, the pipeline optimization operation steps described in step S2 are as follows:

[0054] Design the direction of dredging pipeline 1, install a new mud pipe to connect the gate valve system to the deck pump, make good use of the original mud pipe, adjust the position of the mud pipe direction by adding elbows and cutting the mud pipe to weld the flange, so as to connect the deck pump to the suction port. Use climbing hose on site to flexibly adjust the mud pipe direction.

[0055] Furthermore, the water sealing control operation steps described in step S2 are as follows:

[0056] 1. The staff lowers the auger to 5 meters below the waterline;

[0057] 2. Close the gate valve, notify the mud pump to start sealing water, and add sealing water into the mud pipe for 30 minutes. At this time, the front end of the deck pump is full of water. The sealing water system is a protective system of the cutter suction vessel to prevent mud and sand from entering the mud pump shaft and other key components during construction, causing wear;

[0058] 3. The staff starts the deck pump and opens the gate valve within 2-3 seconds. After completing the pump closing operation, dredging construction can be carried out.

[0059] Furthermore, the electrical control logic reconstruction steps described in step S3 are as follows:

[0060] Connect the hydraulic vacuum release valve 1011 signal line to the bridge gate valve solenoid valve, and connect the gate valve oil pipe to the oil cylinder for opening and closing the gate valve. The gate valve action is controlled by the oil cylinder linkage. The driving console temporarily uses the vacuum release valve 1011 control system to control the closing of the gate valve.

[0061] Add a manual short-circuit switch to solve the pump closing failure caused by signal conflict.

[0062] Specifically, the present invention achieves the following significant effects through the above technical improvements:

[0063] 1. Efficiency improvement: The construction efficiency of a single pump reaches 70% of that of the dual-pump mode, the discharge pressure is stable within 0.8 MPa, and the mud concentration can be controlled at 20-25%.

[0064] 2. Equipment protection: The cavitation incidence rate is reduced by 90%, and the vibration value of the mud pump is reduced from 4.8mm / s to 3.2mm / s.

[0065] 3. Cost saving: The technical transformation time is shortened from 10 days to 3 days, and the fuel consumption is reduced by 20% (0.8L / m 3 ).

[0066] 4. Enhanced safety: The success rate of gate valve signal feedback is increased to 100%, eliminating the risk of pump closing failure.

[0067] The most important thing is to prevent the adverse situation of ship shutdown caused by the underwater pump being unusable and the single deck pump being unable to be constructed before the technical transformation, and to ensure the overall progress and smooth operation of the project.

[0068] However, it is important to note the following: 1. Overload operation is strictly prohibited: In single-pump mode, the continuous power should be ≤85% of the rated power to avoid motor burnout; 2. Soil adaptability limitations: Single pumps are not suitable for soils containing large-size stones (>10cm) or high-viscosity soils; 3. Collaborative operation: Cooperate with the positioning anchor boat to reduce the impact of the ship's lateral resistance on the pump.

[0069] Reference Figure 1 As a preferred technical solution of the present invention, the dredging pipeline 1 includes several interconnected pipes, which are sequentially arranged as a sediment suction pipe 101, a variable flange connecting steel pipe 102, a newly calibrated steel mud pipe 103, a bent steel pipe fitting 104, an armored climbing hose 105 and a deck steel pipe 106. The end of the deck steel pipe 106 away from the armored climbing hose 105 is connected to the deck pump. The bent steel pipe fitting 104 consists of two 25-degree bent steel pipes and one 15-degree bent steel pipe. The gate valve system is arranged between the variable flange connecting steel pipe 102 and the bent steel pipe fitting 104. The gate valve system includes a gate valve body 107. The gate valve requires a new installation and calibration of the inlet and outlet gate valve sealing pipes to prevent sediment from wearing the shaft sealing rubber ring. The vacuum release valve 1011 is arranged at the suction end of the sediment suction pipe 101.

[0070] Reference Figure 1 As the preferred technical solution of the present invention, the mud suction pipe 101, the variable flange connection steel pipe 102, the new steel mud pipe 103, the bent steel pipe fitting 104, the armored climbing hose 105, the deck steel pipe 106 and the gate valve body 107 are all equipped with pipe positioning brackets 108 at both ends to prevent the pipeline from vibrating and displacing during construction.

[0071] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As a preferred technical solution of the present invention, the sediment suction pipe 101, the variable flange connecting steel pipe 102, the new steel mud pipe 103, the bent steel pipe fitting 104, the armored climbing hose 105, the deck steel pipe 106 and the gate valve body 107 are respectively provided with a first flange 2 and a second flange 3 at both ends. An annular groove 4 is provided on the first flange 2 and the second flange 3, and a sealing gasket 401 is provided in the annular groove 4. Each first flange 2 is provided with a positioning portion for positioning the second flange 3 adjacent to it.

[0072] Furthermore, the positioning part includes an electric push rod 5 fixed on the first flange 2, an annular plate 501 arranged at the movable end of the electric push rod 5, a plurality of side plates 502 evenly arranged on the outside of the annular plate 501 in a circumferential manner, a rotating rod 503 rotatably connected to the side plate 502, and an abutment plate 504 arranged at one end of the rotating rod 503 away from the side plate 502, the abutment plate 504 is movably abutted against the second flange 3, a positioning rod 201 is fixed on the first flange 2, and a positioning hole 301 matching the positioning rod 201 is opened on the second flange 3.

[0073] Furthermore, a fixing tube 6 is fixedly provided on the outer side of the first flange 2, a guide block 601 is fixedly provided on the inner wall of the fixing tube 6, and a track groove 7 is provided on the rotating rod 503 to slide with the guide block 601. The track groove 7 includes a spiral groove 701 and a straight groove 702 that are connected to each other.

[0074] Specifically, when two adjacent pipes of the dredging pipeline 1 are connected, the end of the abutment plate 504 is away from the central axis of the first flange 2, so that the second flange 3 can abut against the first flange 2, and the abutment plate 504 can be prevented from blocking the second flange 3 from approaching the first flange 2. Subsequently, the positioning rod 201 of the first flange 2 is inserted into the positioning hole 301 of the second flange 3 to avoid misalignment of the first flange 2 and the second flange 3 during assembly and connection. Then, the electric push rod 5 is controlled to operate so that the movable end of the electric push rod 5 drives the annular plate 501 to move away from the first flange 2 and the second flange 3. The movable end of the electric push rod 5 drives the rotating rod 503 and the abutment plate 504 to move through the side plate 502, so that the abutment plate 504 moves toward the first flange 2 and the second flange 3. During this period, the track groove 7 on the rotating rod 503 is aligned with the inner groove of the fixed pipe 6. The guide block 601 cooperates with the guide block 601, so that the rotating rod 503 drives the abutment plate 504 to rotate relative to the side plate 502, and then the abutment plate 504 rotates to a position close to the central axis of the second flange 3. At this time, the guide block 601 is placed in the straight groove 702, and the rotating rod 503 no longer rotates. As the electric push rod 5 continues to work, the abutment plate 504 finally abuts against the side of the second flange 3 away from the first flange 2, and the sealing gaskets 401 of the first flange 2 and the second flange 3 are squeezed and deformed, thereby realizing the rapid assembly of the first flange 2 and the second flange 3, replacing the method of fixing the two flanges by screwing multiple bolts. The operation is simple and fast, and avoids the phenomenon of unstable connection between flanges caused by loosening of bolts during long-term use due to the use of bolt connection, thereby improving the pipeline connection efficiency and the stability between the flanges.

[0075] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A single pump construction and reconstruction method for a large cutter suction vessel deck pump, characterized in that: The following steps are involved: S1: Gate valve system installation and signal optimization; S2: Pipeline optimization and water sealing control; S3: Electrical control logic reconstruction.

2. The method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 1, characterized in that: The specific operation of installing the gate valve system described in step S1 is as follows: The staff first organized the dismantling of the mud pipes connecting the front and rear of the underwater pump, and removed the underwater pump body and gear box to leave space for the subsequent installation of the gate valve system; A gate valve system is installed at the front end of the original underwater pump. The distance from the gate valve system to the suction port of the dredging pipeline (1) is 15m to ensure that the gate valve can be submerged below the waterline after the bridge is lowered. The gate valve operating switch is extended to the bridge. The deck suction water supply gate valve is removed from the ship and used as the suction gate valve.

3. The method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 2, characterized in that: The signal optimization described in step S1 specifically involves: signal feedback improvement; The 4-core signal line of the original suction gate valve at the end of the bridge is extended to the gate valve system, and the opening and closing signal feedback is realized by using the PNP proximity switch, and the status is displayed through the indicator light on the driving console.

4. The method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 1, characterized in that: The pipeline optimization operation steps described in step S2 are as follows: Design the dredging pipeline (1) and install a new mud pipe to connect the gate valve system to the deck pump. During this process, make good use of the existing mud pipe and adjust the mud pipe's direction by adding elbows and cutting the mud pipe to recalibrate the welded flange to connect the deck pump to the suction port. The water sealing control operation steps described in step S2 are as follows: The staff lowered the auger to 5 meters below the waterline; Close the gate valve, notify the mud pump to start sealing water, and add sealing water into the mud pipe for 30 minutes. At this time, the front end of the deck pump is full of water; The staff starts the deck pump and opens the gate valve within 2-3 seconds. After completing the pump closing operation, dredging construction can be carried out.

5. The method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 1, characterized in that: The electrical control logic reconstruction steps described in step S3 are as follows: Connect the signal line of the hydraulic vacuum release valve (1011) to the solenoid valve of the bridge gate valve, and control the gate valve action through the linkage of the oil cylinder; Add a manual short-circuit switch to solve the pump closing failure caused by signal conflict.

6. The method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 2, characterized in that: The dredging pipeline (1) comprises a plurality of interconnected pipes, wherein the plurality of pipes are sequentially arranged as a sediment suction pipe (101), a variable flange connection steel pipe (102), a new steel mud pipe (103), a bent steel pipe fitting (104), an armored climbing hose (105) and a deck steel pipe (106); one end of the deck steel pipe (106) away from the armored climbing hose (105) is connected to a deck pump; the bent steel pipe fitting (104) comprises two 25-degree bent steel pipes and one 15-degree bent steel pipe; the gate valve system is arranged between the variable flange connection steel pipe (102) and the bent steel pipe fitting (104); the gate valve system comprises a gate valve body (107); and the vacuum release valve (1011) is arranged at the suction end of the sediment suction pipe (101).

7. A method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 6, characterized in that: Both ends of the sediment suction pipe (101), the variable flange connection steel pipe (102), the new steel mud pipe (103), the bent steel pipe (104), the armored climbing hose (105), the deck steel pipe (106) and the gate valve body (107) are equipped with pipe positioning brackets (108).

8. A single pump construction and reconstruction method for a large cutter suction vessel deck pump according to claim 7, characterized in that: The two ends of the sediment suction pipe (101), the variable flange connecting steel pipe (102), the new steel mud pipe (103), the bent steel pipe fitting (104), the armored climbing hose (105), the deck steel pipe (106) and the gate valve body (107) are respectively provided with a first flange (2) and a second flange (3), and the first flange (2) and the second flange (3) are both provided with an annular groove (4), and a sealing gasket (401) is provided in the annular groove (4). Each of the first flanges (2) is provided with a positioning portion for positioning the second flange (3) adjacent thereto.

9. A method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 8, characterized in that: The positioning portion comprises an electric push rod (5) fixed on the first flange (2), an annular plate (501) arranged at the movable end of the electric push rod (5), a plurality of side plates (502) uniformly arranged on the outer side of the annular plate (501), a rotating rod (503) rotatably connected to the side plate (502), and an abutting plate (504) arranged at one end of the rotating rod (503) away from the side plate (502), wherein the abutting plate (504) is movably abutted against the second flange (3), a positioning rod (201) is fixed on the first flange (2), and a positioning hole (301) is opened on the second flange (3) and matched with the positioning rod (201).

10. A method for constructing and reconstructing a single pump on a large cutter suction vessel deck pump according to claim 9, characterized in that: A fixed tube (6) is fixedly provided on the outer side of the first flange (2), a guide block (601) is fixedly provided on the inner side wall of the fixed tube (6), and a track groove (7) is provided on the rotating rod (503) for slidingly cooperating with the guide block (601), and the track groove (7) includes a spiral groove (701) and a straight groove (702) that are connected to each other.

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