Disassembly and maintenance process for cylinder valve servomotor in turbine pit

Abstract

The invention discloses a disassembly and maintenance process for a cylinder valve servomotor in a turbine pit, and relates to the technical field of hydraulic turbine unit maintenance. The disassembly and maintenance process for the cylinder valve servomotor in the turbine pit comprises the following steps that S1, the position of the cylinder valve servomotor to be disassembled and maintained is determined, and the position of a lifting point corresponding to the cylinder valve servomotor to be disassembled is determined in a lower rack of a generator; s2, a hoisting assembly is installed at the hoisting point position, and the position of a traction piece in the hoisting assembly is adjusted; s3, the cylinder valve servomotor is disassembled and hoisted step by step through the hoisting assembly according to the assembling procedure; s4, the disassembled parts are checked, and the parts which are abraded and fail are replaced; and S5, all parts of the servomotor repaired through the lifting assembly are sequentially reassembled. According to the disassembly and maintenance process for the barrel valve servomotor in the machine pit, disassembly operation of the oil cylinder of the barrel valve servomotor can be carried out in the machine pit, replacement of all seals of the barrel valve servomotor in the machine pit is achieved, and the construction period, the manpower cost, the material cost and the financial cost consumed by maintenance of the barrel valve servomotor are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of maintenance of a water turbine unit, and in particular to a disassembly and maintenance process of a cylinder valve servomotor in a machine pit. Background Art

[0002] Hydroelectric power stations convert the kinetic energy of water flow into mechanical energy through turbines, and generate induced current by cutting the magnetic field. During long-term use, the turbines need to be regularly inspected and maintained, and different levels of maintenance must be carried out according to the degree of damage to the turbine components.

[0003] In a hydro turbine unit, the cylinder valve is driven by a cylinder valve servomotor to open or cut off the water flow entering the turbine. The oil seal and water seal in the cylinder valve servomotor are prone to aging failure in a humid environment. When the hydro turbine unit has not yet reached the overhaul cycle, the oil seal and water seal fail, resulting in oil leakage and water ingress in the servomotor cylinder, which poses a great hidden danger to operational safety and environmental pollution. Due to the limited space above the cylinder valve servomotor in the turbine room pit, according to conventional processes, the unit needs to be overhauled in advance. The top cover, cylinder valve and servomotor are hoisted out as a whole, and the cylinder valve servomotor cylinder is disassembled in an open area in conjunction with the unit A-level overhaul. However, the unit overhaul is carried out simply to replace the cylinder valve servomotor cylinder seal, which requires a total construction period of 90-100 days, which seriously affects the availability factor of the hydro turbine unit, consumes a lot of manpower, material and financial resources, and has a high maintenance cost. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a disassembly and maintenance process for a cylinder valve servo in a machine pit. The disassembly and maintenance process for a cylinder valve servo in a machine pit can carry out disassembly operations of the cylinder of the cylinder valve servo in the machine pit, thereby realizing replacement of the seal in the machine pit, greatly reducing the construction period, manpower, material and financial costs consumed in the maintenance of the cylinder valve servo, and eliminating the problem of water and oil leakage caused by damaged seals of the cylinder valve servo, thereby ensuring the safe operation of the turbine unit.

[0006] The disassembly and maintenance process of the cylinder valve servomotor in the machine pit of the embodiment of the present invention is based on a hydro-turbine generator set, the hydro-turbine generator set includes a turbine cylinder valve servomotor and a generator lower frame, the cylinder valve servomotor is installed on the top cover of the water machine room and connected to the valve body of the cylinder valve, the lower frame is arranged above the top cover of the water machine room and includes a center body and a lower support arm arranged on the periphery of the center body, and the lower support arm is arranged in the upper space of the cylinder valve servomotor, the process includes the following steps:

[0007] S1: Determine the position of the cylinder valve servomotor to be dismantled for maintenance, remove the bottom cover plate of the lower arm corresponding to the cylinder valve servomotor, and determine the position of the lifting point in the cavity of the lower arm corresponding to the installation position of the cylinder valve servomotor to be dismantled for maintenance;

[0008] S2: Install the lifting assembly at the lifting point, adjust the position of the traction member in the lifting assembly, and ensure that the moving track of the traction member in the vertical direction coincides with the axis of the cylinder valve servomotor;

[0009] S3: using the lifting assembly to dismantle and lift the components of the cartridge valve servomotor in sequence according to the assembly process of the cartridge valve servomotor;

[0010] S4: Check each component of the disassembled cartridge valve servomotor one by one to confirm whether the component is worn out and failed, and replace the worn out and failed components;

[0011] S5: Use the lifting assembly to reinstall the repaired and replaced parts in sequence according to the assembly process and perform a pressure test.

[0012] The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to the embodiment of the present invention can carry out the disassembly operation of the cylinder of the cylinder valve servomotor in the machine pit and realize the replacement of the seal in the machine pit, which greatly reduces the construction period, manpower, material and financial costs consumed in the maintenance of the cylinder valve servomotor, eliminates the problem of water and oil leakage caused by seal damage of the cylinder valve servomotor, and ensures the safe operation of the turbine unit.

[0013] In some embodiments, in step S3, before disassembling the cylinder valve servomotor, the valve body of the cylinder valve is adjusted to a fully open state through the cylinder valve servomotor, and the valve body of the cylinder valve is hung up through the hanging bolts.

[0014] In some embodiments, in step S5, during the pressure test, the repaired cylinder valve servomotor is filled with oil to build up pressure for a pressure test to confirm that no leakage occurs in any part of the cylinder valve servomotor.

[0015] In some embodiments, after the pressure test is completed and all parts are checked for leakage, the unit cylinder valve hydraulic system is pressure-built and exhausted as a whole, the mounting bolts of the cylinder valve body are removed, and after observing that there is no abnormality in the pressure in the upper and lower chambers of the cylinder of the cylinder of the cylinder valve servomotor, the cylinder valve body is subjected to multiple full-closing and full-opening tests through the cylinder valve servomotor to ensure that there is no leakage in all parts of the cylinder valve servomotor and that the opening and closing actions of the cylinder valve are normal.

[0016] In some embodiments, in step S3, multiple components of the barrel valve servomotor are dismantled in sequence in the order of the servomotor digital cylinder, the oil cylinder connecting hydraulic pipeline, the upper cylinder cover, the screw pair, the piston, the cylinder body, and the lower cylinder cover. In step S5, the dismantled multiple components are reinstalled in sequence in the order of the last dismantled and the first installed.

[0017] In some embodiments, in step S3, when the hydraulic pipeline connecting the relay digital cylinder and the oil cylinder is removed, the accumulated oil in the pipeline is drained and both ends of the pipeline are wrapped for protection.

[0018] In some embodiments, in step S4, when inspecting the disassembled parts, the lift rod seal, cylinder head seal and piston seal are disassembled, each seal is cleaned and inspected, the seal mounting groove is cleaned, and the worn and failed seals are replaced.

[0019] In some embodiments, in step S5, when multiple components are reinstalled, the surface of the lifting rod and the inner wall of the cylinder head and cylinder body are lubricated, and it is observed whether there is any jamming or jumping phenomenon in each sealing structure during the reinstallation process.

[0020] In some embodiments, the lifting assembly includes a support member and a connecting member, the support member corresponds to a cylinder valve relay arranged in the cavity of the lower arm, the connecting member is slidably arranged on the support member, and the traction member is connected to the connecting member. In step S2, the position of the traction member is calibrated by adjusting the position of the connecting member relative to the support member.

[0021] In some embodiments, the two side walls of the inner cavity of the lower support arm are respectively provided with connecting parts corresponding to the cylinder valve relay, the two ends of the support member are respectively detachably connected to the connecting parts, and the position of the support member relative to the connecting part along the extension direction of the lower support arm is adjustable. In step S2, the position of the traction member is calibrated relative to the cylinder valve relay by adjusting the position of the support member. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic flow chart of a disassembly and maintenance process of a cylinder valve servomotor in a machine pit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0024] like Figure 1 As shown, the disassembly and maintenance process of the cylinder valve servomotor in the machine pit of the embodiment of the present invention is based on a hydro-turbine generator set, the hydro-turbine generator set includes a turbine cylinder valve servomotor and a generator lower frame (hereinafter referred to as the cylinder valve servomotor and the lower frame), the cylinder valve servomotor is arranged on the top cover of the water machine room and connected to the valve body of the cylinder valve, the lower frame is arranged above the top cover of the water machine room and includes a center body and a lower support arm arranged on the periphery of the center body, and the lower support arm is arranged in the upper space of the cylinder valve servomotor corresponding to the cylinder valve servomotor, and the disassembly and maintenance process includes the following steps:

[0025] S1: Determine the position of the cylinder valve servomotor to be dismantled for maintenance, remove the bottom cover plate of the lower arm corresponding to the cylinder valve servomotor, and determine the position of the lifting point in the cavity of the lower arm corresponding to the installation position of the cylinder valve servomotor to be dismantled for maintenance;

[0026] S2: Install the lifting assembly at the lifting point, adjust the position of the traction member in the lifting assembly, and ensure that the moving track of the traction member in the vertical direction coincides with the axis of the cylinder valve servomotor;

[0027] S3: using the lifting assembly to dismantle and lift the components of the cartridge valve servomotor in sequence according to the assembly process of the cartridge valve servomotor;

[0028] S4: Check each component of the disassembled cartridge valve servomotor one by one to confirm whether the component is worn out and failed, and replace the worn out and failed components;

[0029] S5: Use the lifting assembly to reinstall the repaired and replaced parts in sequence according to the assembly process and perform a pressure test.

[0030] The disassembly and maintenance process of the cylinder valve relay in the machine pit of the embodiment of the present invention proposes for the first time to disassemble the oil cylinder of the cylinder valve relay in the machine pit, and to repair and replace the seals and other components of the cylinder valve relay. By utilizing the lower arm space on the side of the lower frame, the working space in the machine pit is increased, and the replacement of the seals in the machine pit is achieved. Combined with the C / D level maintenance of the power plant, the entire maintenance process can be completed within a limited time, which greatly reduces the construction period, manpower, material and financial costs consumed in the maintenance of the cylinder valve relay, eliminates the problem of water and oil leakage caused by damaged seals of the cylinder valve relay, ensures the safe operation of the turbine unit, and creates significant economic and safety benefits for the enterprise.

[0031] Optionally, the traction member is a hand chain hoist, and the maximum load capacity of the hand chain hoist is ensured to meet the traction requirements for the valve body servomotor component.

[0032] Optionally, after the cartridge valve servomotor is reinstalled, the lifting assembly is disassembled and the bottom cover plate of the lower support arm is reinstalled.

[0033] In some embodiments, the lifting assembly includes a support member and a connecting member. The support member corresponds to a cylinder valve relay and is arranged in the cavity of the lower arm. The connecting member is slidably arranged on the support member. The traction member is connected to the connecting member. In step S2, the position of the traction member is calibrated by adjusting the position of the connecting member relative to the support member.

[0034] Specifically, the supporting member is an I-shaped steel beam, and the connecting member includes a movable frame mounted on the I-shaped steel beam and a connecting ring arranged at the bottom center of the movable frame. The two ends of the I-shaped steel beam are respectively connected to the two side walls of the cavity of the lower support arm to ensure the stability of the connection. The position of the movable frame is adjusted to facilitate the alignment of the connecting ring with the cylinder valve relay to be disassembled. When in use, the hand winch is hung on the connecting ring for easy operation.

[0035] In some embodiments, the two side walls of the inner cavity of the lower support arm are respectively provided with connecting parts corresponding to the cylinder valve relay, the two ends of the support member are respectively detachably connected to the connecting parts, and the position of the support member relative to the connecting part along the extension direction of the lower support arm is adjustable. In step S2, the position of the traction member is calibrated relative to the cylinder valve relay by adjusting the position of the support member.

[0036] Specifically, the connecting part is a mounting plate fixedly arranged on the lower support arm, and the mounting plate is provided with a long mounting hole extending in the extending direction of the lower support arm, and a through-hole is provided on the I-shaped steel beam corresponding to the long mounting hole, and the connection between the support member and the connecting part is achieved by simultaneously installing fixing bolts in the long mounting hole and the through-hole, and the installation position of the I-shaped steel beam can be adjusted through the long mounting hole, so that the lifting point of the traction member is aligned with the corresponding cylinder valve relay to be repaired, and the installation and disassembly of the support member can be achieved through the fixing bolts, and when repairing multiple cylinder valve relays, the support member can be reused, so as to reduce the number of support members used and reduce the material and manpower occupied by maintenance.

[0037] In some embodiments, in step S3, before disassembling the cylinder valve servomotor, the valve body of the cylinder valve is adjusted to a fully open state through the cylinder valve servomotor, thereby facilitating the disassembly of the piston, and the valve body of the cylinder valve is hung up by the hanging bolts to fix the valve body, thereby releasing the traction of the lifting rod of the cylinder valve servomotor on the valve body, thereby improving the safety and reliability of the cylinder valve servomotor during disassembly and maintenance.

[0038] In some embodiments, in step S3, multiple components of the barrel valve servomotor are removed in sequence according to the order of the servomotor digital cylinder, the oil cylinder connecting hydraulic pipeline, the upper cylinder cover, the screw pair, the piston, the cylinder body, and the lower cylinder cover.

[0039] Specifically, when removing the relay digital cylinder and the hydraulic pipeline connected to the cylinder, remove the relay digital cylinder, the hydraulic pipeline connected to the cylinder and the pressure measuring tube that need to be dismantled respectively, arrange them side by side to eliminate oil accumulation in the pipeline, and wrap both ends of the pipeline for protection to prevent impurities from entering the hydraulic pipeline connected to the cylinder, ensure the normal use of the hydraulic pipeline connected to the cylinder after reinstallation, and improve the maintenance quality.

[0040] When the relay digital cylinder is dismantled and lifted, the relay digital cylinder is securely fixed by a hand hoist, the 4 M20×60 hexagon socket bolts connecting the digital cylinder and the upper cylinder cover are removed, the stepper motor handle on the top of the digital cylinder is shaken in the direction of the cylinder valve opening, the screw of the digital cylinder screw pair is removed upward, and the digital cylinder is simultaneously pulled vertically upward by a hand hoist until the connecting flange at the upper end of the screw pair is out of the upper cylinder cover, the 10 hexagon socket bolts connected to the upper end of the screw pair are removed, the screw pair is separated from the digital cylinder, and after lifting the digital cylinder to a certain height, it is moved horizontally down to the sleepers pre-arranged next to it and laid down steadily, covered with a clean white cloth, and protective measures are taken to prevent tipping and rolling.

[0041] When removing and lifting the upper cylinder cover of the relay, remove the 20 M30×370 connecting bolts connecting the upper cylinder cover of the relay and the cylinder body, lift the upper cylinder cover vertically with a hand hoist, and then move it horizontally down to the clean soft pad arranged on the walking platform.

[0042] When removing the screw pair, remove the 10 hexagon socket bolts connecting the screw pair and the lifting rod, take out the screw pair, wrap it with a clean silk cloth, mark and number it, and put it in a clean parts box.

[0043] When removing and lifting the servomotor piston, remove the 16 M16×80 connecting bolts of the piston super nut, take out the piston super nut and special gasket, wrap them with clean silk cloth, mark them and put them in a clean parts box. Use the M12 lifting ring to lift the piston vertically out of the cylinder body, and move it horizontally down to the clean soft pad arranged on the walking platform.

[0044] When removing and lifting the relay cylinder body, remove the water machine room walking platform under the relay without affecting the lifting of the relay cylinder body, remove the 20 M30×380 connecting bolts connecting the relay cylinder body and the lower cylinder cover, slowly lift the cylinder body vertically until it is completely separated from the lifting rod, move it horizontally and fall steadily and upside down on the arranged firm and reliable supporting tooling, and wrap both ends with clean silk cloth to prevent foreign objects from entering.

[0045] When removing and lifting the lower cylinder cover of the relay, use a hand winch to slowly and vertically lift the lower cylinder cover until it is completely separated from the lifting rod, and then move it horizontally down to the clean soft pad arranged on the walking platform. During the lifting process, pay attention to ensure that the lower cylinder cover is horizontal throughout the whole process, lift it vertically, control the lifting speed and lift it slowly to prevent scratching the lifting rod.

[0046] In some embodiments, in step S4, when inspecting the disassembled parts, the lift rod seal, cylinder head seal and piston seal are disassembled, each seal is cleaned and inspected, the seal mounting groove is cleaned, and the worn and failed seals are replaced.

[0047] Specifically, carefully check whether there is scale or wear on the surface of the lifting rod and the lower cylinder head sleeve, check whether the lifting rod oil seal and water seal are aged and worn, determine the cause of oil leakage in the cylinder, make inspection records and take photos, and thoroughly clean the dismantled upper and lower cylinder heads, pistons, cylinder bodies, lower cylinder head sleeves and other components of the screw pair, remove the lower cylinder head lifting rod dust ring, shaft step ring, shaft XY ring, shaft square ring, lower cylinder head bottom seal ring, upper and lower cylinder heads and cylinder body seals, piston seals, guide rings, and thoroughly clean the installation grooves of each seal ring, and install corresponding qualified new seal rings and guide rings. Before installation, check that the specifications, materials and quality of the seal rings and guide rings are qualified, and that they have been inspected on-site by the manufacturer's technical staff and meet the installation requirements. During installation, pay attention to the installation position and direction of each seal ring and assembly Figure 1 The shaft step ring and shaft XY ring are directional and must be installed strictly according to the direction of the assembly drawing.

[0048] In some embodiments, in step S5, the disassembled components are reassembled in order of last disassembly and first installation, so as to ensure efficient disassembly and reassembly operations and avoid omission of components during reassembly.

[0049] Specifically, during reinstallation, after a comprehensive inspection and cleaning of the removed parts, check that there are no defects on the surface of the lifting rod, and that the lifting rod seal, cylinder head seal, and piston seal are correctly reinstalled. After a comprehensive inspection without abnormalities, evenly apply turbine oil to the cylinder head and the inner wall of the cylinder body for adequate lubrication, start reinstallation, and reinstall the cylinder head in the following order: reinstall the cylinder body - reinstall the lower cylinder head and cylinder body connecting bolts - reinstall the piston - install the piston super nut - reinstall the screw pair - reinstall the upper cylinder head - reinstall the upper cylinder head connecting bolts - reinstall the digital cylinder and connect the screw pair - reinstall the digital cylinder connecting bolts - reinstall the hydraulic pipeline and pressure measuring tube.

[0050] When reinstalling the cylinder head, cylinder body and piston, control the falling speed of the hand hoist and keep it falling completely vertically to prevent the cylinder head, cylinder body, piston and lifting rod from scratching. During the reinstallation process, strictly monitor the sealing structures to ensure that there is no abnormal jamming or jumping. Tighten the connecting bolts in strict accordance with the symmetrical and step-by-step tightening method.

[0051] In some embodiments, in step S5, when performing a pressure test, the repaired cylinder valve servomotor is filled with oil to build up pressure for a pressure test to confirm that no leakage occurs in any part of the cylinder valve servomotor.

[0052] Specifically, after completing the reinstallation of the cylinder valve servomotor, during the pressure test, fill the oil cylinder with hydraulic oil, use a hydraulic pump to build up the pressure of the cylinder valve servomotor to 7.5MPa, check that there is no leakage in all parts of the servomotor, then reinstall the servomotor digital cylinder and connect the transmission rod and the servomotor connecting pipeline.

[0053] Open the main oil supply valve of the cylinder valve to complete the exhaust operation of the relay. When performing the exhaust operation, remove the upper chamber pressure measuring pipe joint, shake the handle of the digital cylinder stepper motor back and forth to exhaust, until there is no gas or bubbles in the discharged oil, and comprehensively check all parts of the relay for leakage to ensure the quality of maintenance.

[0054] In some embodiments, after the pressure test is completed and all parts are checked for leakage, the unit cylinder valve hydraulic system is pressure-built and exhausted as a whole, the mounting bolts of the valve body of the cylinder valve are removed, and after observing that there is no abnormality in the pressure in the upper and lower chambers of the cylinder of the cylinder valve relay, the cylinder valve is subjected to multiple small opening tests. After the small opening opens and closes normally, multiple full-stroke, fully-closed and fully-open tests are performed to ensure that the cylinder valve opens and closes normally and has good synchronization.

[0055] Optionally, after the cartridge valve servomotor is reinstalled, the lifting assembly is disassembled and the bottom cover plate of the lower support arm is reinstalled.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A disassembly and maintenance process of a cylinder valve servomotor in a machine pit, based on a hydro-turbine generator set, the hydro-turbine generator set comprises a turbine cylinder valve servomotor and a generator lower frame, the cylinder valve servomotor is installed on the top cover of the water machine room and connected to the valve body of the cylinder valve, the lower frame is arranged above the top cover of the water machine room and comprises a center body and a lower support arm arranged on the periphery of the center body, and the lower support arm is arranged in the upper space of the cylinder valve servomotor, characterized in that: The process comprises the following steps: S1: Determine the position of the cylinder valve servomotor to be dismantled for maintenance, remove the bottom cover plate of the lower arm corresponding to the cylinder valve servomotor, and determine the position of the lifting point in the cavity of the lower arm corresponding to the installation position of the cylinder valve servomotor to be dismantled for maintenance; S2: Install the lifting assembly at the lifting point, adjust the position of the traction member in the lifting assembly, and ensure that the moving track of the traction member in the vertical direction coincides with the axis of the cylinder valve servomotor; S3: using the lifting assembly to sequentially disassemble and lift the components of the cartridge valve servomotor according to the assembly process of the cartridge valve servomotor; S4: Check each component of the disassembled cartridge valve servomotor one by one to confirm whether the component is worn out and failed, and replace the worn out and failed components; S5: Use the lifting assembly to reinstall the repaired and replaced parts in sequence according to the assembly process and perform a pressure test.

2. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 1 is characterized in that: In step S3, before disassembling the cylinder valve servomotor, the valve body of the cylinder valve is adjusted to a fully open state through the cylinder valve servomotor, and the valve body of the cylinder valve is hung up through the hanging bolts.

3. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 2 is characterized in that: In step S5, when performing the pressure test, the cylinder valve servomotor to be repaired is filled with oil to build up pressure for a pressure test to confirm that no leakage occurs in any part of the cylinder valve servomotor.

4. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 3 is characterized in that: After the pressure test is completed and all parts are checked for leakage, the unit cylinder valve hydraulic system is pressure-built and exhausted as a whole, the mounting bolts of the cylinder valve body are removed, and after observing that there is no abnormality in the pressure in the upper and lower chambers of the cylinder of the cylinder of the cylinder valve servomotor, the cylinder valve body is subjected to multiple full-closing and full-opening tests through the cylinder valve servomotor to ensure that there is no leakage in all parts of the cylinder valve servomotor and that the opening and closing actions of the cylinder valve are normal.

5. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 1 is characterized in that: In step S3, the multiple components of the barrel valve servomotor are dismantled in sequence according to the order of the servomotor digital cylinder, the oil cylinder connecting hydraulic pipeline, the upper cylinder cover, the screw pair, the piston, the cylinder body, and the lower cylinder cover. In step S5, the dismantled multiple components are reinstalled in sequence according to the order of last dismantled and first installed.

6. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 5 is characterized in that: In step S3, when the hydraulic pipelines connecting the relay digital cylinder and the oil cylinder are removed, the accumulated oil in the pipelines is drained and both ends of the pipelines are wrapped for protection.

7. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 1 is characterized in that: In step S4, when inspecting the disassembled parts, the lift rod seal, cylinder head seal and piston seal are disassembled, each seal is cleaned and inspected, the seal installation groove is cleaned, and the worn and failed seals are replaced.

8. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 1 is characterized in that: In step S5, when reinstalling multiple components, the surface of the lifting rod and the inner wall of the cylinder head and cylinder body are lubricated, and whether there is any jamming or jumping phenomenon in each sealing structure during the reinstallation process is observed.

9. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 1 is characterized in that: The lifting assembly includes a support member and a connecting member. The support member corresponds to a cylinder valve relay and is arranged in the cavity of the lower arm. The connecting member is slidably arranged on the support member. The traction member is connected to the connecting member. In step S2, the position of the traction member is calibrated by adjusting the position of the connecting member relative to the support member.

10. The disassembly and maintenance process of the cylinder valve servomotor in the machine pit according to claim 9 is characterized in that: The two side walls of the inner cavity of the lower support arm are respectively provided with connecting parts corresponding to the cylinder valve relay, and the two ends of the support member are respectively detachably connected to the connecting parts, and the position of the support member relative to the connecting part along the extension direction of the lower support arm is adjustable. In step S2, the position of the traction member is calibrated relative to the cylinder valve relay by adjusting the position of the support member.

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