Sludge pump water sealing pipe system gate valve switching control method of cutter suction dredger

Abstract

The invention discloses a dredge pump water sealing pipe system gate valve switching control method for a cutter suction dredger, which is used for a dredge pump water sealing pipe system gate valve switching system comprising an underwater dredge pump, a first-stage dredge pump, a second-stage dredge pump, a low-pressure standby water sealing pump and a high-pressure standby water sealing pump. The control method comprises a low-pressure water sealing pump replacement mode, a high-pressure water sealing pump replacement mode and a second-stage dredge pump high-low-pressure water sealing pump switching mode. According to the invention, the alternative use and pipeline switching of one low-pressure standby water sealing pump to other low-pressure water sealing pumps are realized, the alternative use and pipeline switching of one high-pressure standby water sealing pump to other high-pressure water sealing pumps are realized, the water sealing performance requirements under the conditions of long blowing distance and high discharge pressure are met, the flexible selection and pipeline switching of the high-pressure water sealing pumps and the low-pressure water sealing pumps of the second-stage dredge pump are realized, and the working efficiency is improved. The use requirement for the optimal water sealing pressure under different working condition modes is met, time loss caused by manual switching of the valve set and efficiency loss caused by maintenance of the water sealing pump are avoided, and the equipment utilization rate and the construction efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dredging ship engineering, and particularly to a method for switching control of a gate valve in a water sealing pipe system of a cutter suction dredger. Background Art

[0002] With the continuous expansion of the domestic and international dredging market demands, as the main dredging equipment for waterway dredging and port construction, cutter suction dredgers are also developing towards the direction of large-scale. The performance design and dredging operation system of large cutter suction dredgers are also moving towards high levels such as intelligence, multi-condition adaptation, and long blowing distance according to market demands.

[0003] Among them, the mud pump, as the core equipment of the cutter suction dredger, is crucial for the efficient performance of the ship's construction. The efficient performance and long-term use of the mud pump are inseparable from the reasonable design of the water sealing system. Only by reasonably configuring and designing the water sealing pump and the water sealing system can the normal, effective, and long-term operation of the mud pump be ensured. Traditionally, generally, a separate water sealing pump is provided at each of the suction end and the shaft end of the mud pump, and a standby water sealing pump is additionally provided to improve the reliability of the entire water sealing system. When the layout space for the water sealing pump, pipeline, gate valve, etc. is limited, generally, one or more standby water sealing pumps are selected, and the alternative use of the standby water sealing pump is realized through the switching of valves. However, when there are many alternative working conditions for the standby water sealing pump, the layout of the water sealing pipe system and the gate valve will become very complicated.

[0004] Currently, the opening / closing control of the gate valves at the water sealing inlet and outlet pipelines of the mud pump of most cutter suction dredgers and the switching gate valves established for the water sealing pipelines to meet the alternative use of the standby water sealing pump are basically realized through manual operation. In order to achieve rapid switching, often multiple people need to work simultaneously, which increases the labor input and is not conducive to the effective exertion of the ship's operation efficiency. In addition, to meet the performance requirements of large cutter suction dredgers for long blowing distance, high discharge pressure, and multi-condition use, higher requirements are also put forward for the system design of the water sealing pump layout, pipe system, and gate valve. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides a control method for switching the gate valves of the water sealing pipe system of the mud pump of a cutter suction dredger. By setting a low-pressure standby water sealing pump and a low-pressure alternative switching valve and coordinating with the automatic control of the inlet and outlet valves of each low-pressure water sealing pump, the alternative use of one low-pressure standby water sealing pump for other low-pressure water sealing pumps and the pipeline switching are realized; by setting a high-pressure standby water sealing pump and a high-pressure alternative switching valve and coordinating with the automatic control of the inlet and outlet valves of each high-pressure water sealing pump, the alternative use of one high-pressure standby water sealing pump for other high-pressure water sealing pumps and the pipeline switching are realized, meeting the water sealing performance requirements under long blowing distance and high discharge pressure; by setting a water sealing bypass and a water sealing bypass switching valve for the high- and low-pressure water sealing pumps of the secondary mud pump and realizing automatic control, the flexible selection and pipeline switching of the high- and low-pressure water sealing pumps of the secondary mud pump are realized, meeting the usage requirements for the optimal water sealing pressure under different working conditions, avoiding the time loss caused by manual switching of valve groups and the efficiency loss caused by the maintenance of water sealing pumps, and effectively improving the equipment utilization rate and construction efficiency.

[0006] The present invention is implemented as follows. A control method for switching the gate valves of the water sealing pipe system of the mud pump of a cutter suction dredger is used for the gate valve switching system of the water sealing pipe system of the mud pump. The gate valve switching system of the water sealing pipe system of the mud pump includes an underwater mud pump, a primary mud pump, a secondary mud pump, a low-pressure standby water sealing pump, and a high-pressure standby water sealing pump; a water sealing pump for the suction end of the underwater mud pump and a water sealing pump for the shaft end of the underwater mud pump are correspondingly arranged at the suction end and the shaft end of the underwater mud pump, a water sealing pump for the suction end of the primary mud pump and a water sealing pump for the shaft end of the primary mud pump are correspondingly arranged at the suction end and the shaft end of the primary mud pump, a low-pressure water sealing pump for the suction end of the secondary mud pump and a high-pressure water sealing pump for the suction end of the secondary mud pump are sequentially arranged at the suction end of the secondary mud pump, and a low-pressure water sealing pump for the shaft end of the secondary mud pump and a high-pressure water sealing pump for the shaft end of the secondary mud pump are sequentially arranged at the shaft end of the secondary mud pump; inlet valves and outlet valves are correspondingly arranged at the inlets and outlets of the water sealing pump for the suction end of the underwater mud pump, the water sealing pump for the shaft end of the underwater mud pump, the water sealing pump for the suction end of the primary mud pump, the water sealing pump for the shaft end of the primary mud pump, the low-pressure water sealing pump for the suction end of the secondary mud pump, the low-pressure water sealing pump for the shaft end of the secondary mud pump, the high-pressure water sealing pump for the suction end of the secondary mud pump, and the high-pressure water sealing pump for the shaft end of the secondary mud pump. Inlet valves and outlet valves are correspondingly arranged at the inlets and outlets of the low-pressure standby water sealing pump. The outlet valves of the low-pressure standby water sealing pump are respectively connected to the outlet valves of the water sealing pump for the suction end of the underwater mud pump, the water sealing pump for the shaft end of the underwater mud pump, the water sealing pump for the suction end of the primary mud pump, the water sealing pump for the shaft end of the primary mud pump, the low-pressure water sealing pump for the suction end of the secondary mud pump, and the low-pressure water sealing pump for the shaft end of the secondary mud pump through low-pressure alternative switching valves. The inlets and outlets of the high-pressure standby water sealing pump are respectively connected to the inlet valve and the outlet valve of the high-pressure water sealing pump for the suction end of the secondary mud pump through a 1# high-pressure alternative switching valve, and the inlets and outlets of the high-pressure standby water sealing pump are respectively connected to the inlet valve and the outlet valve of the high-pressure water sealing pump for the shaft end of the secondary mud pump through a 2# high-pressure alternative switching valve. The inlet valves and outlet valves of the low-pressure seal water pumps at the suction end of the secondary sludge pump, the inlet valves and outlet valves of the low-pressure seal water pumps at the shaft end of the secondary sludge pump, the inlet valves and outlet valves of the high-pressure seal water pumps at the suction end of the secondary sludge pump, and the inlet valves and outlet valves of the high-pressure seal water pumps at the shaft end of the secondary sludge pump are respectively connected in parallel with seal water bypasses, and seal water bypass switching valves are arranged on each seal water bypass; The control method includes a control method for the low-pressure seal water pump replacement mode, a control method for the high-pressure seal water pump replacement mode, and a control method for the high-low pressure seal water pump switching mode of the secondary sludge pump; The control method for the low-pressure seal water pump replacement mode is that the low-pressure standby seal water pump replaces the low-pressure suction end / shaft end of the corresponding sludge pump; the control method for the high-pressure seal water pump replacement mode is that the high-pressure standby seal water pump replaces the high-pressure suction end / shaft end of the secondary sludge pump; the control method for the high-low pressure seal water pump switching mode of the secondary sludge pump is to use only the high-pressure / low-pressure seal water pump as the seal water for the secondary sludge pump; Using only the high-pressure / low-pressure seal water pump as the seal water for the secondary sludge pump includes the situation of using the high-pressure / low-pressure seal water pump without replacement, the situation of using the high-pressure seal water pump and the high-pressure standby seal water pump replacing the high-pressure suction end / shaft end of the secondary sludge pump, and the situation of using the low-pressure seal water pump and the low-pressure standby seal water pump replacing the low-pressure suction end / shaft end of the secondary sludge pump.

[0007] Further, when the low-pressure standby seal water pump replaces the low-pressure suction end / shaft end of the corresponding sludge pump, the inlet valves and outlet valves of the low-pressure seal water pump at the shaft end / suction end of this sludge pump and the inlet valves and outlet valves of the low-pressure seal water pumps of other sludge pumps are opened, the inlet valves and outlet valves of the low-pressure standby seal water pump are opened, the outlet valve of the low-pressure standby seal water pump is connected to the low-pressure replacement switching valve at the suction end / shaft end of the low-pressure seal water pump of this sludge pump and opened, other low-pressure replacement switching valves are closed, and the inlet valves and outlet valves of the low-pressure seal water pump at the suction end / shaft end of this sludge pump are closed.

[0008] Further, when the high-pressure standby seal water pump replaces the high-pressure suction end / shaft end of the secondary sludge pump, the inlet valves and outlet valves of the high-pressure seal water pump at the shaft end / suction end of the secondary sludge pump are opened, the 1# / 2# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are opened, the inlet valves and outlet valves of the high-pressure seal water pump at the suction end / shaft end of the secondary sludge pump are closed, the 2# / 1# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed, and the seal water bypass switching valves on the seal water bypasses of the high- and low-pressure seal water pumps at the suction end and shaft end of the secondary sludge pump are closed.

[0009] Further, when using a high-pressure / low-pressure seal water pump and there is no alternative, the inlet valves and outlet valves of each high-pressure / low-pressure seal water pump of the secondary sludge pump are opened, the seal water bypass switching valves on the seal water bypasses of each low-pressure / high-pressure seal water pump of the secondary sludge pump are opened, the 1# and 2# high-pressure alternative switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed, the seal water bypass switching valves on the seal water bypasses of each high-pressure / low-pressure seal water pump of the secondary sludge pump are closed, the inlet valves and outlet valves of each low-pressure / high-pressure seal water pump of the secondary sludge pump are closed, and the low-pressure alternative switching valves of each low-pressure seal water pump of the secondary sludge pump are closed.

[0010] Further, when using a high-pressure seal water pump and the high-pressure standby seal water pump replaces the high-pressure suction end / shaft end of the secondary sludge pump, the inlet valves and outlet valves of the high-pressure seal water pump corresponding to the shaft end / suction end of the secondary sludge pump are opened, the 1# / 2# high-pressure alternative switching valves at the inlet and outlet of the high-pressure standby seal water pump are opened, the seal water bypass switching valves on the seal water bypasses of each low-pressure seal water pump of the secondary sludge pump are opened, the inlet valves and outlet valves of the high-pressure seal water pump at the suction end / shaft end of the secondary sludge pump are closed, the 2# / 1# high-pressure alternative switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed, the seal water bypass switching valves on the seal water bypasses of each high-pressure seal water pump of the secondary sludge pump are closed, the inlet valves and outlet valves of each low-pressure seal water pump of the secondary sludge pump are closed, and the low-pressure alternative switching valves of each low-pressure seal water pump of the secondary sludge pump are closed.

[0011] Further, when using a low-pressure seal water pump and the low-pressure standby seal water pump replaces the low-pressure suction end / shaft end of the secondary sludge pump, the inlet valves and outlet valves of the low-pressure seal water pump corresponding to the shaft end / suction end of the secondary sludge pump are opened, the seal water bypass switching valves on the seal water bypasses of each high-pressure seal water pump of the secondary sludge pump are opened, the inlet valves and outlet valves of the low-pressure standby seal water pump are opened, the outlet valve of the low-pressure standby seal water pump is connected to the low-pressure alternative switching valve at the suction end / shaft end of the low-pressure seal water pump of the secondary sludge pump and is opened, other low-pressure alternative switching valves are closed, the inlet valves and outlet valves of the low-pressure seal water pump at the suction end / shaft end of the secondary sludge pump are closed, the seal water bypass switching valves on the seal water bypasses of each low-pressure seal water pump of the secondary sludge pump are closed, the inlet valves and outlet valves of each high-pressure seal water pump of the secondary sludge pump are closed, and the 1# and 2# high-pressure alternative switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed.

[0012] Further, each inlet valve, each outlet valve, each low-pressure alternative switching valve, each 1# high-pressure alternative switching valve, each 2# high-pressure alternative switching valve, each seal water bypass switching valve, and each seal water pump are automatically opened or closed by a PLC programmable logic controller.

[0013] Further, limit switches are installed on each inlet valve, each outlet valve, each low-pressure alternative switching valve, each 1# high-pressure alternative switching valve, each 2# high-pressure alternative switching valve, and each seal water bypass switching valve.

[0014] Further, pressure sensors and flow sensors are installed on the shaft end seal water pipelines and suction port end seal water pipelines of the underwater slurry pump, the first-stage slurry pump, and the second-stage slurry pump.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. Through the automatic control of the inlet and outlet valves of the seal water pump and the high and low pressure standby seal water pump switching valve, the present invention realizes the automatic control of the gate valve switching and pipeline establishment of the slurry pump seal water system, meets the automatic switching and establishment of the high and low pressure seal water systems under various combined modes of the seal water pump, avoids the time loss caused by manual valve group switching and the efficiency loss caused by the maintenance of the seal water pump, and effectively improves the equipment utilization rate and construction efficiency.

[0016] 2. By setting a low-pressure standby seal water pump and a low-pressure alternative switching valve, the present invention realizes the alternative use and pipeline switching of one low-pressure standby seal water pump for other low-pressure seal water pumps; by setting a high-pressure standby seal water pump and a high-pressure alternative switching valve, the present invention realizes the alternative use and pipeline switching of one high-pressure standby seal water pump for other high-pressure seal water pumps, meeting the seal water performance requirements for long blowing distance and high discharge pressure; by setting a seal water bypass and a seal water bypass switching valve for the high and low pressure seal water pumps of the second-stage slurry pump, the present invention realizes the automatic control of the gate valve switching and pipeline establishment of the high and low pressure seal water systems of the second-stage slurry pump, not only meeting the seal water performance requirements for long blowing distance and high discharge pressure, but also meeting the usage requirements for the optimal seal water pressure under different working conditions. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the gate valve switching system of the seal water system of the cutter suction dredger provided by the present invention.

[0018] In the figure, 1. Underwater slurry pump; 11. Underwater slurry pump suction port end seal water pump; 12. Underwater slurry pump shaft end seal water pump; 2. First-stage slurry pump; 21. First-stage slurry pump suction port end seal water pump; 22. First-stage slurry pump shaft end seal water pump; 3. Second-stage slurry pump; 31. Second-stage slurry pump suction port end low-pressure seal water pump; 32. Second-stage slurry pump suction port end high-pressure seal water pump; 33. Second-stage slurry pump shaft end low-pressure seal water pump; 34. Second-stage slurry pump shaft end high-pressure seal water pump; 4. Low-pressure standby seal water pump; 5. High-pressure standby seal water pump. Detailed Embodiments

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further details the present invention in combination with embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Embodiment Please refer to Figure 1 , an embodiment of the present invention provides a control method for switching the gate valve of the mud pump sealing water pipe system of a cutter suction dredger, which is used for the gate valve switching system of the mud pump sealing water pipe system. The gate valve switching system of the mud pump sealing water pipe system includes an underwater mud pump 1, a primary mud pump 2, a secondary mud pump 3, a low-pressure standby sealing water pump 4, and a high-pressure standby sealing water pump 5. The suction end and shaft end of the underwater mud pump 1 are respectively provided with an underwater mud pump suction end sealing water pump 11 and an underwater mud pump shaft end sealing water pump 12. The suction end and shaft end of the primary mud pump 2 are respectively provided with a primary mud pump suction end sealing water pump 21 and a primary mud pump shaft end sealing water pump 22. The suction end of the secondary mud pump 3 is successively provided with a secondary mud pump suction end low-pressure sealing water pump 31 and a secondary mud pump suction end high-pressure sealing water pump 32. The shaft end of the secondary mud pump 3 is successively provided with a secondary mud pump shaft end low-pressure sealing water pump 33 and a secondary mud pump shaft end high-pressure sealing water pump 34. Import valves and export valves are respectively provided at the inlets and outlets of the underwater mud pump suction end sealing water pump 11, the underwater mud pump shaft end sealing water pump 12, the primary mud pump suction end sealing water pump 21, the primary mud pump shaft end sealing water pump 22, the secondary mud pump suction end low-pressure sealing water pump 31, the secondary mud pump shaft end low-pressure sealing water pump 33, the secondary mud pump suction end high-pressure sealing water pump 32, and the secondary mud pump shaft end high-pressure sealing water pump 34.

[0023] Specifically, inlet valve EV11 and outlet valve EV12 are correspondingly arranged at the inlet and outlet of the underwater mud pump suction end seal water pump 11, inlet valve EV13 and outlet valve EV14 are correspondingly arranged at the inlet and outlet of the underwater mud pump shaft end seal water pump 12, inlet valve EV15 and outlet valve EV16 are correspondingly arranged at the inlet and outlet of the first-stage mud pump suction end seal water pump 21, inlet valve EV17 and outlet valve EV18 are correspondingly arranged at the inlet and outlet of the first-stage mud pump shaft end seal water pump 22, inlet valve EV21 and outlet valve EV22 are correspondingly arranged at the inlet and outlet of the second-stage mud pump suction end low-pressure seal water pump 31, inlet valve EV23 and outlet valve EV24 are correspondingly arranged at the inlet and outlet of the second-stage mud pump shaft end low-pressure seal water pump 33, inlet valve EV25 and outlet valve EV26 are correspondingly arranged at the inlet and outlet of the second-stage mud pump suction end high-pressure seal water pump 32, and inlet valve EV27 and outlet valve EV28 are correspondingly arranged at the inlet and outlet of the second-stage mud pump shaft end high-pressure seal water pump 34.

[0024] Inlet valves and outlet valves are respectively arranged at the inlet and outlet of the low-pressure standby seal water pump 4. The outlet valves of the low-pressure standby seal water pump 4 are respectively connected to the outlet valves of the underwater mud pump suction end seal water pump 11, the underwater mud pump shaft end seal water pump 12, the first-stage mud pump suction end seal water pump 21, the first-stage mud pump shaft end seal water pump 22, the second-stage mud pump suction end low-pressure seal water pump 31, and the second-stage mud pump shaft end low-pressure seal water pump 33 through low-pressure alternative switching valves.

[0025] Specifically, inlet valve EV19 and outlet valve EV20 are correspondingly arranged at the inlet and outlet of the low-pressure standby seal water pump 4. The outlet valve EV20 of the low-pressure standby seal water pump 4 is connected to the outlet valve EV12 of the underwater mud pump suction end seal water pump 11 through the low-pressure alternative switching valve EV29 and is communicated to the suction end seal water pipe of the underwater mud pump 1. The outlet valve EV20 of the low-pressure standby seal water pump 4 is connected to the outlet valve EV14 of the underwater mud pump shaft end seal water pump 12 through the low-pressure alternative switching valve EV30 and is communicated to the shaft end seal water pipe of the underwater mud pump 1; the outlet valve EV20 of the low-pressure standby seal water pump 4 is connected to the outlet valve EV16 of the first-stage mud pump suction end seal water pump 21 through the low-pressure alternative switching valve EV31 and is communicated to the suction end seal water pipe of the first-stage mud pump 2. The outlet valve EV20 of the low-pressure standby seal water pump 4 is connected to the outlet valve EV18 of the first-stage mud pump shaft end seal water pump 22 through the low-pressure alternative switching valve EV32 and is communicated to the shaft end seal water pipe of the first-stage mud pump 2; the outlet valve EV20 of the low-pressure standby seal water pump 4 is connected to the outlet valve EV22 of the second-stage mud pump suction end low-pressure seal water pump 31 through the low-pressure alternative switching valve EV33 and is communicated to the inlet valve EV25 of the second-stage mud pump suction end high-pressure seal water pump 32. The outlet valve EV20 of the low-pressure standby seal water pump 4 is connected to the outlet valve EV24 of the second-stage mud pump shaft end low-pressure seal water pump 33 through the low-pressure alternative switching valve EV34 and is communicated to the inlet valve EV27 of the second-stage mud pump shaft end high-pressure seal water pump 34.

[0026] The inlet and outlet of the high-pressure standby seal water pump 5 are respectively connected to the inlet valve and outlet valve of the high-pressure seal water pump 32 at the suction end of the secondary sludge pump through the 1# high-pressure alternative switching valve, and the inlet and outlet of the high-pressure standby seal water pump 5 are respectively connected to the inlet valve and outlet valve of the high-pressure seal water pump 34 at the shaft end of the secondary sludge pump through the 2# high-pressure alternative switching valve.

[0027] Specifically, the inlet of the high-pressure standby seal water pump 5 is connected to the inlet valve EV25 of the high-pressure seal water pump 32 at the suction end of the secondary sludge pump through the 1# high-pressure alternative switching valve EV35, and the outlet of the high-pressure standby seal water pump 5 is connected to the outlet valve EV26 of the high-pressure seal water pump 32 at the suction end of the secondary sludge pump through the 1# high-pressure alternative switching valve EV36; the inlet of the high-pressure standby seal water pump 5 is connected to the inlet valve EV27 of the high-pressure seal water pump 34 at the shaft end of the secondary sludge pump through the 2# high-pressure alternative switching valve EV37, and the inlet and outlet of the high-pressure standby seal water pump 5 are connected to the outlet valve EV28 of the high-pressure seal water pump 34 at the shaft end of the secondary sludge pump through the 2# high-pressure alternative switching valve EV38.

[0028] The inlet valve and outlet valve of the low-pressure seal water pump 31 at the suction end of the secondary sludge pump, the inlet valve and outlet valve of the low-pressure seal water pump 33 at the shaft end of the secondary sludge pump, the inlet valve and outlet valve of the high-pressure seal water pump 32 at the suction end of the secondary sludge pump, and the inlet valve and outlet valve of the high-pressure seal water pump 34 at the shaft end of the secondary sludge pump are respectively provided with seal water bypasses in parallel, and seal water bypass switching valves are arranged on each seal water bypass.

[0029] Specifically, the inlet valve EV21 and outlet valve EV22 of the low-pressure seal water pump 31 at the suction end of the secondary sludge pump are provided with a low-pressure seal water bypass at the suction end of the secondary sludge pump 3 in parallel, and a seal water bypass switching valve EV39 is arranged on the low-pressure seal water bypass at the suction end of the secondary sludge pump 3; the inlet valve EV23 and outlet valve EV24 of the low-pressure seal water pump 33 at the shaft end of the secondary sludge pump are provided with a low-pressure seal water bypass at the shaft end of the secondary sludge pump 3 in parallel, and a seal water bypass switching valve EV40 is arranged on the low-pressure seal water bypass at the shaft end of the secondary sludge pump 3; the inlet valve EV25 and outlet valve EV26 of the high-pressure seal water pump 32 at the suction end of the secondary sludge pump are provided with a high-pressure seal water bypass at the suction end of the secondary sludge pump 3 in parallel, and a seal water bypass switching valve EV41 is arranged on the high-pressure seal water bypass at the suction end of the secondary sludge pump 3; the inlet valve EV27 and outlet valve EV28 of the high-pressure seal water pump 34 at the shaft end of the secondary sludge pump are provided with a high-pressure seal water bypass at the shaft end of the secondary sludge pump 3 in parallel, and a seal water bypass switching valve EV42 is arranged on the high-pressure seal water bypass at the shaft end of the secondary sludge pump 3.

[0030] Limit switches are installed on each inlet valve, each outlet valve, each low-pressure alternative switching valve, each 1# high-pressure alternative switching valve, each 2# high-pressure alternative switching valve, and each seal water bypass switching valve.

[0031] Specifically, limit switches are installed on the inlet valve EV11, outlet valve EV12, inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV19, outlet valve EV20, inlet valve EV21, outlet valve EV22, inlet valve EV23, outlet valve EV24, inlet valve EV25, outlet valve EV26, inlet valve EV27, outlet valve EV28, low-pressure alternative switching valve EV29, low-pressure alternative switching valve EV30, low-pressure alternative switching valve EV31, low-pressure alternative switching valve EV32, low-pressure alternative switching valve EV33, low-pressure alternative switching valve EV34, 1# high-pressure alternative switching valve EV35, 1# high-pressure alternative switching valve EV36, 2# high-pressure alternative switching valve EV37, 2# high-pressure alternative switching valve EV38, water seal bypass switching valve EV39, water seal bypass switching valve EV40, water seal bypass switching valve EV41, and water seal bypass switching valve EV42.

[0032] Pressure sensors and flow sensors are installed on the shaft end water seal pipelines and suction end water seal pipelines of the underwater mud pump 1, primary mud pump 2, and secondary mud pump 3.

[0033] Each inlet valve, each outlet valve, each low-pressure alternative switching valve, each 1# high-pressure alternative switching valve, each 2# high-pressure alternative switching valve, each water seal bypass switching valve, and each water seal pump are controlled by a PLC programmable logic controller to be automatically opened or closed.

[0034] The control method for the gate valve switching of the mud pump water seal pipe system of the cutter suction dredger is divided into three types, namely: the control method for the low-pressure water seal pump alternative mode, the control method for the high-pressure water seal pump alternative mode, and the control method for the high and low-pressure water seal pump switching mode of the secondary mud pump 3.

[0035] The control method for the low-pressure water seal pump alternative mode is that the low-pressure standby water seal pump 4 replaces the low-pressure suction end / shaft end of the corresponding mud pump; when the low-pressure standby water seal pump 4 replaces the low-pressure suction end / shaft end of the corresponding mud pump, the inlet valve and outlet valve of the low-pressure water seal pump at the shaft end / suction end of this mud pump and the inlet valve and outlet valve of the low-pressure water seal pump of other mud pumps are opened, the inlet valve and outlet valve of the low-pressure standby water seal pump 4 are opened, the outlet valve of the low-pressure standby water seal pump 4 is connected to the low-pressure alternative switching valve at the suction end / shaft end of the low-pressure water seal pump of this mud pump and opened, other low-pressure alternative switching valves are closed, and the inlet valve and outlet valve of the low-pressure water seal pump at the suction end / shaft end of this mud pump are closed.

[0036] Specifically, it includes: the low-pressure standby seal water pump 4 replaces the suction end of the underwater mud pump 1, the low-pressure standby seal water pump 4 replaces the shaft end of the underwater mud pump 1, the low-pressure standby seal water pump 4 replaces the suction end of the primary mud pump 2, the low-pressure standby seal water pump 4 replaces the shaft end of the primary mud pump 2, the low-pressure standby seal water pump 4 replaces the low-pressure suction end of the secondary mud pump 3, and the low-pressure standby seal water pump 4 replaces the low-pressure shaft end of the secondary mud pump 3.

[0037] After activating this mode, initialize. The inlet valve EV11, outlet valve EV12, inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are opened, the inlet valve EV19 and outlet valve EV20 are closed, and the low-pressure replacement switching valves EV29, EV30, EV31, EV32, EV33, and EV34 are closed.

[0038] When the low-pressure standby seal water pump 4 replaces the suction end of the underwater mud pump 1, the inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are opened, the inlet valve EV19 and outlet valve EV20 are opened, the low-pressure replacement switching valve EV29 is opened, and the low-pressure replacement switching valves EV30, EV31, EV32, EV33, and EV34 are closed. The inlet valve EV11 and outlet valve EV12 are closed.

[0039] When the low-pressure standby seal water pump 4 replaces the shaft end of the underwater mud pump 1, the inlet valve EV11, outlet valve EV12, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are opened, the inlet valve EV19 and outlet valve EV20 are opened, the low-pressure replacement switching valve EV30 is opened, and the low-pressure replacement switching valves EV29, EV31, EV32, EV33, and EV34 are closed. The inlet valve EV13 and outlet valve EV14 are closed.

[0040] When the low-pressure standby seal water pump 4 replaces the suction end of the first-stage sludge pump 2, the inlet valve EV11, outlet valve EV12, inlet valve EV13, outlet valve EV14, inlet valve EV17, outlet valve EV18, inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are opened, the inlet valve EV19 and outlet valve EV20 are opened, the low-pressure replacement switching valve EV31 is opened, the low-pressure replacement switching valves EV29, EV30, EV32, EV33, and EV34 are closed, and the inlet valve EV15 and outlet valve EV16 are closed.

[0041] When the low-pressure standby seal water pump 4 replaces the shaft end of the first-stage sludge pump 2, the inlet valve EV11, outlet valve EV12, inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are opened, the inlet valve EV19 and outlet valve EV20 are opened, the low-pressure replacement switching valve EV32 is opened, the low-pressure replacement switching valves EV29, EV30, EV31, EV33, and EV34 are closed, and the inlet valve EV17 and outlet valve EV18 are closed.

[0042] When the low-pressure standby seal water pump 4 replaces the low-pressure suction end of the second-stage sludge pump 3, the inlet valve EV11, outlet valve EV12, inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV23, and outlet valve EV24 are opened, the inlet valve EV19 and outlet valve EV20 are opened, the low-pressure replacement switching valve EV33 is opened, the low-pressure replacement switching valves EV29, EV30, EV31, EV32, and EV34 are closed, and the inlet valve EV21 and outlet valve EV22 are closed.

[0043] When the low-pressure standby seal water pump 4 replaces the low-pressure shaft end of the second-stage sludge pump 3, the inlet valve EV11, outlet valve EV12, inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV21, and outlet valve EV22 are opened, the inlet valve EV19 and outlet valve EV20 are opened, the low-pressure replacement switching valve EV34 is opened, the low-pressure replacement switching valves EV29, EV30, EV31, EV32, and EV33 are closed, and the inlet valve EV23 and outlet valve EV24 are closed.

[0044] The working conditions of the low-pressure seal water pump replacement mode are shown in Table 1 below: Table 1 Working Conditions of the Low-Pressure Seal Water Pump Replacement Mode

[0045] The control method for the high-pressure seal water pump replacement mode is that the high-pressure standby seal water pump 5 replaces the high-pressure suction end / axial end of the secondary sludge pump 3; when the high-pressure standby seal water pump 5 replaces the high-pressure suction end / axial end of the secondary sludge pump 3, the inlet valve and outlet valve of the high-pressure seal water pump corresponding to the axial end / suction end of the secondary sludge pump 3 are opened, the 1# / 2# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump 5 are opened, the inlet valve and outlet valve of the high-pressure seal water pump at the suction end / axial end of the secondary sludge pump 3 are closed, the 2# / 1# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump 5 are closed, and the seal water bypass switching valves on the seal water bypass of the high-pressure and low-pressure seal water pumps at the suction end and axial end of the secondary sludge pump 3 are closed.

[0046] Specifically, it is divided into: the high-pressure standby seal water pump 5 replaces the high-pressure suction end of the secondary sludge pump 3, and the high-pressure standby seal water pump 5 replaces the high-pressure axial end of the secondary sludge pump 3.

[0047] After activating this mode, initialize, open the inlet valve EV25, outlet valve EV26, inlet valve EV27, outlet valve EV28, close the 1# high-pressure replacement switching valve EV35, 1# high-pressure replacement switching valve EV36, 2# high-pressure replacement switching valve EV37, 2# high-pressure replacement switching valve EV38, and close the seal water bypass switching valve EV39, seal water bypass switching valve EV40, seal water bypass switching valve EV41, seal water bypass switching valve EV42.

[0048] When the high-pressure standby seal water pump 5 replaces the high-pressure suction end of the secondary sludge pump 3, open the inlet valve EV27 and outlet valve EV28, open the 1# high-pressure replacement switching valve EV35 and 1# high-pressure replacement switching valve EV36, close the inlet valve EV25 and outlet valve EV26, close the 2# high-pressure replacement switching valve EV37 and 2# high-pressure replacement switching valve EV38, and close the seal water bypass switching valve EV39, seal water bypass switching valve EV40, seal water bypass switching valve EV41, seal water bypass switching valve EV42. When the high-pressure standby seal water pump 5 replaces the high-pressure axial end of the secondary sludge pump 3, open the inlet valve EV25 and outlet valve EV26, open the 2# high-pressure replacement switching valve EV37 and 2# high-pressure replacement switching valve EV38, close the inlet valve EV27 and outlet valve EV28, close the 1# high-pressure replacement switching valve EV35 and 1# high-pressure replacement switching valve EV36, and close the seal water bypass switching valve EV39, seal water bypass switching valve EV40, seal water bypass switching valve EV41, seal water bypass switching valve EV42.

[0049] The working conditions of the high-pressure seal water pump replacement mode are specifically shown in Table 2 as follows: Table 2 Working Conditions of the High-Pressure Seal Water Pump Replacement Mode

[0050] The control method for the high - low pressure seal water pump switching mode of the secondary sludge pump 3 is to use only the high - pressure / low - pressure seal water pump as the seal water for the secondary sludge pump 3. Using only the high - pressure / low - pressure seal water pump as the seal water for the secondary sludge pump 3 includes the cases of using the high - pressure / low - pressure seal water pump without substitution, using the high - pressure seal water pump with the high - pressure standby seal water pump 5 substituting the high - pressure suction end / axial end of the secondary sludge pump 3, and using the low - pressure seal water pump with the low - pressure standby seal water pump 4 substituting the low - pressure suction end / axial end of the secondary sludge pump 3.

[0051] When using the high - pressure / low - pressure seal water pump without substitution, the inlet valves and outlet valves of each high - pressure / low - pressure seal water pump of the secondary sludge pump 3 are opened, the seal water bypass switching valves on the seal water bypasses of each low - pressure / high - pressure seal water pump of the secondary sludge pump 3 are opened, the 1# and 2# high - pressure substitution switching valves at the inlet and outlet of the high - pressure standby seal water pump 5 are closed, the seal water bypass switching valves on the seal water bypasses of each high - pressure / low - pressure seal water pump of the secondary sludge pump 3 are closed, the inlet valves and outlet valves of each low - pressure / high - pressure seal water pump of the secondary sludge pump 3 are closed, and the low - pressure substitution switching valves of each low - pressure seal water pump of the secondary sludge pump 3 are closed.

[0052] When using the high - pressure seal water pump with the high - pressure standby seal water pump 5 substituting the high - pressure suction end / axial end of the secondary sludge pump 3, the inlet valves and outlet valves of the high - pressure seal water pump corresponding to the axial end / suction end of the secondary sludge pump 3 are opened, the 1# / 2# high - pressure substitution switching valves at the inlet and outlet of the high - pressure standby seal water pump 5 are opened, the seal water bypass switching valves on the seal water bypasses of each low - pressure seal water pump of the secondary sludge pump 3 are opened, the inlet valves and outlet valves of the high - pressure seal water pump at the suction end / axial end of the secondary sludge pump 3 are closed, the 2# / 1# high - pressure substitution switching valves at the inlet and outlet of the high - pressure standby seal water pump 5 are closed, the seal water bypass switching valves on the seal water bypasses of each high - pressure seal water pump of the secondary sludge pump 3 are closed, the inlet valves and outlet valves of each low - pressure seal water pump of the secondary sludge pump 3 are closed, and the low - pressure substitution switching valves of each low - pressure seal water pump of the secondary sludge pump 3 are closed.

[0053] When using the low - pressure seal water pump with the low - pressure standby seal water pump 4 substituting the low - pressure suction end / axial end of the secondary sludge pump 3, the inlet valves and outlet valves of the low - pressure seal water pump corresponding to the axial end / suction end of the secondary sludge pump 3 are opened, the seal water bypass switching valves on the seal water bypasses of each high - pressure seal water pump of the secondary sludge pump 3 are opened, the inlet valves and outlet valves of the low - pressure standby seal water pump 4 are opened, the outlet valve of the low - pressure standby seal water pump 4 is connected to the low - pressure substitution switching valve at the suction end / axial end of the low - pressure seal water pump of the secondary sludge pump 3 and opened, other low - pressure substitution switching valves are closed, the inlet valves and outlet valves of the low - pressure seal water pump at the suction end / axial end of the secondary sludge pump 3 are closed, the seal water bypass switching valves on the seal water bypasses of each low - pressure seal water pump of the secondary sludge pump 3 are closed, the inlet valves and outlet valves of each high - pressure seal water pump of the secondary sludge pump 3 are closed, and the 1# and 2# high - pressure substitution switching valves at the inlet and outlet of the high - pressure standby seal water pump 5 are closed.

[0054] Among them, after activating this mode, only the high-pressure seal water pump is selected as the seal water for the secondary sludge pump 3, which is specifically divided into the following situations: When using the high-pressure seal water pump without replacement, the inlet valve EV25, outlet valve EV26, inlet valve EV27, and outlet valve EV28 are opened, the seal water bypass switching valves EV39 and EV40 are opened, the 1# high-pressure replacement switching valves EV35 and EV36, the 2# high-pressure replacement switching valves EV37 and EV38 are closed, the seal water bypass switching valves EV41 and EV42 are closed, the inlet valves EV21, outlet valves EV22, inlet valves EV23, and outlet valves EV24 are closed, and the low-pressure replacement switching valves EV33 and EV34 are closed.

[0055] When using the high-pressure seal water pump and the high-pressure standby seal water pump 5 replaces the high-pressure suction end of the secondary sludge pump 3, the inlet valve EV27 and outlet valve EV28 are opened, the 1# high-pressure replacement switching valves EV35 and EV36 are opened, the seal water bypass switching valves EV39 and EV40 are opened, the inlet valve EV25 and outlet valve EV26 are closed, the 2# high-pressure replacement switching valves EV37 and EV38 are closed, the seal water bypass switching valves EV41 and EV42 are closed, the inlet valves EV21, outlet valves EV22, inlet valves EV23, and outlet valves EV24 are closed, and the low-pressure replacement switching valves EV33 and EV34 are closed.

[0056] When using the high-pressure seal water pump and the high-pressure standby seal water pump 5 replaces the high-pressure shaft end of the secondary sludge pump 3, the inlet valve EV25 and outlet valve EV26 are opened, the 2# high-pressure replacement switching valves EV37 and EV38 are opened, the seal water bypass switching valves EV39 and EV40 are opened, the inlet valve EV27 and outlet valve EV28 are closed, the 1# high-pressure replacement switching valves EV35 and EV36 are closed, the seal water bypass switching valves EV41 and EV42 are closed, the inlet valves EV21, outlet valves EV22, inlet valves EV23, and outlet valves EV24 are closed, and the low-pressure replacement switching valves EV33 and EV34 are closed.

[0057] Among them, after activating this mode, only the low-pressure seal water pump is selected as the seal water for the secondary sludge pump 3, which is specifically divided into the following situations: When using the low-pressure sealing water pump and there is no alternative, the inlet valve EV21, outlet valve EV22, inlet valve EV23, outlet valve EV24 are opened, the sealing water bypass switching valve EV41, sealing water bypass switching valve EV42 are opened, the sealing water bypass switching valve EV39, sealing water bypass switching valve EV40 are closed, the low-pressure alternative switching valve EV33, low-pressure alternative switching valve EV34 are closed, the inlet valve EV25, outlet valve EV26, inlet valve EV27, outlet valve EV28 are closed, the 1# high-pressure alternative switching valve EV35, 1# high-pressure alternative switching valve EV36, 2# high-pressure alternative switching valve EV37, 2# high-pressure alternative switching valve EV38 are closed.

[0058] When using the low-pressure sealing water pump and the low-pressure standby sealing water pump 4 replaces the low-pressure suction end of the secondary sludge pump 3, the inlet valve EV23, outlet valve EV24 are opened, the sealing water bypass switching valve EV41, sealing water bypass switching valve EV42 are opened, the inlet valve EV19, outlet valve EV20 are opened, the low-pressure alternative switching valve EV33 is opened, the low-pressure alternative switching valves EV29, EV30, EV31, EV32, low-pressure alternative switching valve EV34 are closed, the inlet valve EV21, outlet valve EV22 are closed, the sealing water bypass switching valve EV39, sealing water bypass switching valve EV40 are closed, the inlet valve EV25, outlet valve EV26, inlet valve EV27, outlet valve EV28 are closed, the 1# high-pressure alternative switching valve EV35, 1# high-pressure alternative switching valve EV36, 2# high-pressure alternative switching valve EV37, 2# high-pressure alternative switching valve EV38 are closed.

[0059] When using the low-pressure sealing water pump and the low-pressure standby sealing water pump 4 replaces the low-pressure shaft end of the secondary sludge pump 3, the inlet valve EV21, outlet valve EV22 are opened, the sealing water bypass switching valve EV41, sealing water bypass switching valve EV42 are opened, the inlet valve EV19, outlet valve EV20 are opened, the low-pressure alternative switching valve EV34 is opened, the low-pressure alternative switching valves EV29, EV30, EV31, EV32, low-pressure alternative switching valve EV33 are closed, the inlet valve EV23, outlet valve EV24 are closed, the sealing water bypass switching valve EV39, sealing water bypass switching valve EV40 are closed, the inlet valve EV25, outlet valve EV26, inlet valve EV27, outlet valve EV28 are closed, the 1# high-pressure alternative switching valve EV35, 1# high-pressure alternative switching valve EV36, 2# high-pressure alternative switching valve EV37, 2# high-pressure alternative switching valve EV38 are closed.

[0060] The working conditions of the high-low pressure sealing water pump switching mode of the secondary sludge pump 3 are shown in Table 3 as follows: Table 3 Working Conditions of the High-Low Pressure Sealing Water Pump Switching Mode of the Secondary Sludge Pump

[0061] It should be noted that in the switching control of the closed water pipe system gate valve, it needs to be completed on the premise that the corresponding mud pump stops, that is, the complete establishment of the closed water pipe system is a sufficient condition for the start of the corresponding mud pump. When the system detects that the established closed water pipe system is not valid, the system issues a warning and causes the interlock stop of the corresponding mud pump. In addition, in the switching control of the closed water pipe system gate valve, the system judges whether the closed water pipe system in the current closed water mode is normally established according to the action signals and switch limit signals of each electric control valve. When the auxiliary judgment condition of the switch limit signal of each electric control valve is established and the switch limit signal is not detected, the system determines that the switch limit signal is abnormal, issues a warning, stops the current switching control of the closed water pipe system gate valve, and switches to manual intervention.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for switching the gate valve of the mud pump sealing water pipe system of a cutter suction dredger, which is used for the gate valve switching system of the mud pump sealing water pipe system, is characterized in that: The gate valve switching system of the mud pump sealing water pipe system includes an underwater mud pump, a primary mud pump, a secondary mud pump, a low-pressure standby sealing water pump, and a high-pressure standby sealing water pump; the suction end and shaft end of the underwater mud pump are respectively provided with an underwater mud pump suction end sealing water pump and an underwater mud pump shaft end sealing water pump, the suction end and shaft end of the primary mud pump are respectively provided with a primary mud pump suction end sealing water pump and a primary mud pump shaft end sealing water pump, the suction end of the secondary mud pump is successively provided with a secondary mud pump suction end low-pressure sealing water pump and a secondary mud pump suction end high-pressure sealing water pump, and the shaft end of the secondary mud pump is successively provided with a secondary mud pump shaft end low-pressure sealing water pump and a secondary mud pump shaft end high-pressure sealing water pump; The outlet valves of the low-pressure standby sealing water pump are respectively connected to the outlet valves of the underwater mud pump suction end sealing water pump, the underwater mud pump shaft end sealing water pump, the primary mud pump suction end sealing water pump, the primary mud pump shaft end sealing water pump, the secondary mud pump suction end low-pressure sealing water pump, and the secondary mud pump shaft end low-pressure sealing water pump through low-pressure alternative switching valves; The inlet and outlet of the high-pressure standby sealing water pump are respectively connected to the inlet valve and outlet valve of the secondary mud pump suction end high-pressure sealing water pump through the 1# high-pressure alternative switching valve, and the inlet and outlet of the high-pressure standby sealing water pump are respectively connected to the inlet valve and outlet valve of the secondary mud pump shaft end high-pressure sealing water pump through the 2# high-pressure alternative switching valve; The inlet valves and outlet valves of the secondary mud pump suction end low-pressure sealing water pump, the secondary mud pump shaft end low-pressure sealing water pump, the secondary mud pump suction end high-pressure sealing water pump, and the secondary mud pump shaft end high-pressure sealing water pump are respectively provided with sealing water bypasses in parallel, and sealing water bypass switching valves are arranged on each sealing water bypass; The control method includes the control method of the low-pressure sealing water pump alternative mode, the control method of the high-pressure sealing water pump alternative mode, and the control method of the secondary mud pump high-low pressure sealing water pump switching mode; The control method of the low-pressure sealing water pump alternative mode is that the low-pressure standby sealing water pump replaces the low-pressure suction end / shaft end of the corresponding mud pump; the control method of the high-pressure sealing water pump alternative mode is that the high-pressure standby sealing water pump replaces the high-pressure suction end / shaft end of the secondary mud pump; the control method of the secondary mud pump high-low pressure sealing water pump switching mode is to use only the high-pressure / low-pressure sealing water pump as the sealing water of the secondary mud pump; Using only the high-pressure / low-pressure sealing water pump as the sealing water of the secondary mud pump includes the situation of using the high-pressure / low-pressure sealing water pump without replacement, the situation of using the high-pressure sealing water pump and the high-pressure standby sealing water pump replacing the high-pressure suction end / shaft end of the secondary mud pump, and the situation of using the low-pressure sealing water pump and the low-pressure standby sealing water pump replacing the low-pressure suction end / shaft end of the secondary mud pump.

2. The control method for switching the gate valve of the slurry pump sealing water pipe system of the cutter suction dredger according to claim 1, wherein, When the low-pressure standby sealing water pump replaces the low-pressure suction end / shaft end of the corresponding mud pump, the inlet valve and outlet valve of the low-pressure sealing water pump at the shaft end / suction end of this mud pump and the inlet valves and outlet valves of the low-pressure sealing water pumps of other mud pumps are opened, the inlet valve and outlet valve of the low-pressure standby sealing water pump are opened, the outlet valve of the low-pressure standby sealing water pump connected to the suction end / shaft end of the low-pressure sealing water pump of this mud pump through the low-pressure alternative switching valve is opened, other low-pressure alternative switching valves are closed, and the inlet valve and outlet valve of the low-pressure sealing water pump at the suction end / shaft end of this mud pump are closed.

3. The control method for switching the gate valve of the mud pump sealing water pipe system of the cutter suction dredger according to claim 1, wherein, When the high-pressure standby seal water pump replaces the high-pressure suction end / axial end of the secondary sludge pump, the inlet valve and outlet valve of the high-pressure seal water pump corresponding to the axial end / suction end of the secondary sludge pump are opened, the 1# / 2# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are opened, the inlet valve and outlet valve of the high-pressure seal water pump at the suction end / axial end of the secondary sludge pump are closed, the 2# / 1# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed, and the seal water bypass switching valves on the seal water bypasses of the high-pressure and low-pressure seal water pumps at the suction end and axial end of the secondary sludge pump are closed.

4. The control method for switching the sluice valve of the mud pump sealing water pipe system of the cutter suction dredger according to claim 1, characterized in that, When using the high-pressure / low-pressure seal water pump without replacement, the inlet valve and outlet valve of each high-pressure / low-pressure seal water pump of the secondary sludge pump are opened, the seal water bypass switching valves on the seal water bypasses of each low-pressure / high-pressure seal water pump of the secondary sludge pump are opened, the 1# and 2# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed, the seal water bypass switching valves on the seal water bypasses of each high-pressure / low-pressure seal water pump of the secondary sludge pump are closed, the inlet valve and outlet valve of each low-pressure / high-pressure seal water pump of the secondary sludge pump are closed, and the low-pressure replacement switching valves of each low-pressure seal water pump of the secondary sludge pump are closed.

5. The control method for switching the gate valve of the mud pump sealing water pipe system of the cutter suction dredger according to claim 1, characterized in that, When using the high-pressure seal water pump and the high-pressure standby seal water pump replaces the high-pressure suction end / axial end of the secondary sludge pump, the inlet valve and outlet valve of the high-pressure seal water pump corresponding to the axial end / suction end of the secondary sludge pump are opened, the 1# / 2# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are opened, the seal water bypass switching valves on the seal water bypasses of each low-pressure seal water pump of the secondary sludge pump are opened, the inlet valve and outlet valve of the high-pressure seal water pump at the suction end / axial end of the secondary sludge pump are closed, the 2# / 1# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed, the seal water bypass switching valves on the seal water bypasses of each high-pressure seal water pump of the secondary sludge pump are closed, the inlet valve and outlet valve of each low-pressure seal water pump of the secondary sludge pump are closed, and the low-pressure replacement switching valves of each low-pressure seal water pump of the secondary sludge pump are closed.

6. The control method for switching the gate valve of the mud pump sealing water pipe system of the cutter suction dredger according to claim 1, characterized in that, When using the low-pressure seal water pump and the low-pressure standby seal water pump replaces the low-pressure suction end / axial end of the secondary sludge pump, the inlet valve and outlet valve of the low-pressure seal water pump corresponding to the axial end / suction end of the secondary sludge pump are opened, the seal water bypass switching valves on the seal water bypasses of each high-pressure seal water pump of the secondary sludge pump are opened, the inlet valve and outlet valve of the low-pressure standby seal water pump are opened, the outlet valve of the low-pressure standby seal water pump is connected to the low-pressure replacement switching valve at the suction end / axial end of the low-pressure seal water pump of the secondary sludge pump and opened, other low-pressure replacement switching valves are closed, the inlet valve and outlet valve of the low-pressure seal water pump at the suction end / axial end of the secondary sludge pump are closed, the seal water bypass switching valves on the seal water bypasses of each low-pressure seal water pump of the secondary sludge pump are closed, the inlet valve and outlet valve of each high-pressure seal water pump of the secondary sludge pump are closed, and the 1# and 2# high-pressure replacement switching valves at the inlet and outlet of the high-pressure standby seal water pump are closed.

7. The control method for switching the sluice valve of the mud pump sealing water pipe system of the cutter suction dredger according to claim 1, wherein Each inlet valve, each outlet valve, each low-pressure replacement switching valve, each 1# high-pressure replacement switching valve, each 2# high-pressure replacement switching valve, each seal water bypass switching valve, and each seal water pump are automatically opened or closed by a PLC programmable logic controller.

8. The control method for switching the gate valve of the mud pump sealing water pipe system of the cutter suction dredger according to claim 1, wherein, Limit switches are installed on each inlet valve, each outlet valve, each low-pressure replacement switching valve, each 1# high-pressure replacement switching valve, each 2# high-pressure replacement switching valve, and each seal water bypass switching valve.

9. The method for controlling the gate valve switching of the slurry pump sealing water pipe system of the cutter suction dredger according to claim 1, characterized in that, Pressure sensors and flow sensors are installed on the shaft end seal water pipelines and suction end seal water pipelines of the underwater mud pump, the first-stage mud pump, and the second-stage mud pump.

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