A machine pit inner cylinder valve booster disassembly maintenance process

Abstract

The application discloses a machine pit inner cylinder valve servomotor disassembly maintenance process and relates to the technical field of water turbine unit maintenance.The machine pit inner cylinder valve servomotor disassembly maintenance process comprises the following steps: S1, determining the position of a to-be-disassembled servomotor, determining the lifting point position of the to-be-disassembled servomotor in the lower frame of a generator; S2, installing a lifting assembly at the lifting point position and adjusting the position of a traction member in the lifting assembly; S3, step-by-step disassembling and lifting the servomotor according to the assembly procedure through the lifting assembly; S4, checking the disassembled parts and replacing the worn-out parts; and S5, sequentially reassembling the repaired servomotor parts through the lifting assembly.The machine pit inner cylinder valve servomotor disassembly maintenance process can carry out the disassembly operation of the servomotor cylinder in the machine pit, can realize the replacement of all seals of the servomotor in the machine pit, and can reduce the time, manpower, material resources and financial cost consumed by the servomotor maintenance.

Description

Technical Field

[0001] This invention relates to the field of turbine maintenance technology, specifically to a disassembly and repair process for a cylinder valve relay device inside the turbine pit. Background Technology

[0002] Hydropower stations convert the kinetic energy of water flow into mechanical energy through turbine units. Induction current is generated by cutting the magnetic field. During long-term use, turbine units need to be inspected regularly, and different levels of maintenance are required depending on the degree of damage to the turbine unit components.

[0003] In a hydroelectric turbine, the cylinder valve is driven by a valve servo to open or cut off the water flow into the turbine. The oil and water seals in the valve servo are prone to aging and failure in humid environments. Even before the turbine reaches its major overhaul cycle, oil and water seal failure can lead to oil leaks and water ingress into the servo cylinder, posing significant operational safety and environmental pollution risks. Due to limited space above the valve servo in the turbine pit, conventional procedures require an earlier major overhaul. This involves hoisting the top cover, valve, and servo as a whole, and disassembling the valve servo cylinder in an open area during a Class A overhaul. However, a major overhaul solely for replacing the valve servo cylinder seals would require 90-100 days, severely impacting the turbine's availability and consuming substantial manpower, resources, and funds, resulting in high maintenance costs. Summary of the Invention

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

[0005] To address this, this invention proposes a process for disassembling and repairing a cylinder valve servo in the turbine pit. This process enables the disassembly of the cylinder valve servo cylinder within the turbine pit, allowing for the replacement of seals within the pit. This significantly reduces the time, manpower, material, and financial costs associated with cylinder valve servo repair, eliminates the problem of water and oil leakage due to damaged seals, and ensures the safe operation of the turbine unit.

[0006] The disassembly and repair process of the cylinder valve relay in the turbine pit according to an embodiment of the present invention is based on a hydro-generator set. The hydro-generator set includes a turbine cylinder valve relay and a generator lower frame. The cylinder valve relay is installed on the top cover of the turbine chamber and connected to the valve body of the cylinder valve. The lower frame is located above the top cover of the turbine chamber and includes a central body and lower support arms disposed around the central body. The lower support arms are located in the upper space of the cylinder valve relay. The process includes the following steps:

[0007] S1: Determine the location of the valve relay to be disassembled and repaired, remove the bottom cover plate of the lower support arm corresponding to the valve relay, and determine the lifting point position in the cavity of the lower support arm corresponding to the installation position of the valve relay to be disassembled and repaired.

[0008] S2: Install the lifting assembly at the lifting point and adjust the position of the traction component in the lifting assembly to ensure that the vertical movement trajectory of the traction component coincides with the axis of the cylinder valve servoir.

[0009] S3: Following the assembly process of the cylinder valve servo, the components of the cylinder valve servo are disassembled and lifted sequentially using the lifting assembly.

[0010] S4: Inspect each component of the disassembled cylinder valve relay one by one to confirm whether the component is worn or failed, and replace the worn or failed component;

[0011] S5: The repaired or replaced parts are reassembled according to the assembly process using the lifting assembly and then subjected to a pressure test.

[0012] The in-sink cylinder valve servo disassembly and repair process of this invention enables the disassembly of the cylinder valve servo cylinder within the sink, allowing for the replacement of seals within the sink. This significantly reduces the time, manpower, material, and financial costs associated with cylinder valve servo repair, eliminates the problem of water and oil leakage due to damaged seals, and ensures the safe operation of the turbine unit.

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

[0014] In some embodiments, in step S5, when performing the pressure test, the valve servoir under repair is pressurized with oil to perform a pressure test to confirm that there is no leakage in any part of the valve servoir.

[0015] In some embodiments, after the pressure test is completed and no leaks are found in any part, the hydraulic system of the unit's cylinder valve is pressurized and vented as a whole. Then, the mounting bolts of the cylinder valve body are removed. After observing that the pressure in the upper and lower chambers of the cylinder valve servo cylinder is normal, the cylinder valve body is subjected to multiple full-close and full-open tests through the cylinder valve servo to ensure that there are no leaks in any part of the cylinder valve servo and that the cylinder valve opening and closing action is normal.

[0016] In some embodiments, in step S3, multiple components of the cylinder valve relay are disassembled sequentially in the order of digital cylinder of the relay, hydraulic pipeline connecting the cylinder, upper cylinder cover, lead screw pair, piston, cylinder body, and lower cylinder cover. In step S5, the disassembled components are reassembled sequentially in the order of last disassembled and first reassembled.

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

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

[0019] In some embodiments, during step S5, when reassembling multiple components, the surface of the lifting rod, as well as the cylinder head and the inner wall of the cylinder, are lubricated, and it is observed whether there is jamming or skipping of the sealing structure during the reassembly process.

[0020] In some embodiments, the lifting assembly includes a support member and a connector. The support member is disposed in the cavity of the lower support arm corresponding to the cylinder valve relay. The connector is slidably disposed on the support member. The traction member is connected to the connector. In step S2, the position of the traction member is calibrated by adjusting the position of the connector 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, and the two ends of the support member are respectively detachably connected to the connecting parts. The position of the support member relative to the connecting parts is adjustable along the extension direction of the lower support arm. 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. Attached Figure Description

[0022] Figure 1 This is a schematic flowchart illustrating the disassembly and repair process of the cylinder valve relay device in the machine pit according to an embodiment of the present invention. Detailed Implementation

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

[0024] like Figure 1 As shown, the disassembly and repair process of the cylinder valve relay in the turbine pit according to an embodiment of the present invention is based on a hydro-generator set. The hydro-generator set includes a turbine cylinder valve relay and a lower generator frame (hereinafter referred to as the cylinder valve relay and the lower frame). The cylinder valve relay is located on the top cover of the turbine chamber and is connected to the valve body of the cylinder valve. The lower frame is located above the top cover of the turbine chamber and includes a central body and lower support arms arranged around the central body. The lower support arms are located in the upper space of the cylinder valve relay corresponding to the cylinder valve relay. The disassembly and repair process includes the following steps:

[0025] S1: Determine the location of the valve relay to be disassembled and repaired, remove the bottom cover plate of the lower support arm corresponding to the valve relay, and determine the lifting point position in the cavity of the lower support arm corresponding to the installation position of the valve relay to be disassembled and repaired.

[0026] S2: Install the lifting assembly at the lifting point and adjust the position of the traction component in the lifting assembly to ensure that the vertical movement trajectory of the traction component coincides with the axis of the cylinder valve servoir.

[0027] S3: Following the assembly process of the cylinder valve servo, the components of the cylinder valve servo are disassembled and lifted sequentially using the lifting assembly.

[0028] S4: Inspect each component of the disassembled cylinder valve relay one by one to confirm whether the component is worn or failed, and replace the worn or failed component;

[0029] S5: The repaired or replaced parts are reassembled according to the assembly process using the lifting assembly and then subjected to a pressure test.

[0030] The present invention's embodiment of the in-pit disassembly and repair process for the cylinder valve servo unit proposes for the first time to disassemble the cylinder of the cylinder valve servo unit within the pit, and to repair and replace components such as the seals of the cylinder valve servo unit. By utilizing the space of the lower support arm on the periphery of the lower frame, the working space within the pit is increased, enabling the replacement of seals within the pit. Combined with power plant C / D level maintenance, the entire maintenance process can be completed within a limited time, greatly reducing the time, manpower, material resources, and financial costs of cylinder valve servo unit maintenance, and eliminating the problem of water and oil leakage due to damaged seals in the cylinder valve servo unit, ensuring the safe operation of the turbine unit, and creating significant economic and safety benefits for the enterprise.

[0031] Optionally, a hand-operated hoist can be used as the traction device, ensuring that the maximum load capacity of the hand-operated hoist meets the traction requirements of the valve body relay components.

[0032] Optionally, after the cylinder valve servo is reinstalled, the lifting assembly is disassembled and the bottom cover plate of the lower outrigger is reinstalled.

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

[0034] Specifically, the support component is an I-beam, and the connecting component includes a movable frame sleeved on the I-beam and a connecting ring set at the bottom center of the movable frame. The two ends of the I-beam are respectively connected to the two side walls of the lower support arm cavity to ensure connection stability. The position of the movable frame is adjusted to align the connecting ring with the cylinder valve relay to be disassembled. When in use, the hand chain hoist is attached to 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, and the two ends of the support member are respectively detachably connected to the connecting parts. The position of the support member relative to the connecting part is adjustable along the extension direction of the lower support arm. 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 installed on the lower support arm. The mounting plate has an elongated mounting hole extending along the extension direction of the lower support arm. The I-beam has a through hole corresponding to the elongated mounting hole. By simultaneously inserting fixing bolts into the elongated mounting hole and the through hole, the support and the connecting part can be connected. At the same time, the installation position of the I-beam can be adjusted through the elongated mounting hole to facilitate the alignment of the lifting point of the traction component with the corresponding valve relay to be repaired. The fixing bolts can be used to install and remove the support. When repairing multiple valve relays, the support can be reused, reducing the number of support components used and reducing the material and resources required for maintenance.

[0037] In some embodiments, in step S3, before disassembling the cylinder valve relay, the valve body of the cylinder valve is adjusted to the fully open state by the cylinder valve relay, which facilitates the disassembly of the piston. The valve body of the cylinder valve is then hung up by the mounting bolts to fix the valve body, thereby releasing the lifting rod of the cylinder valve relay from pulling on the valve body and improving the safety and reliability of disassembling and repairing the cylinder valve relay.

[0038] In some embodiments, in step S3, multiple components of the cylinder valve relay are disassembled sequentially in the order of the relay digital cylinder, the hydraulic pipeline connecting the oil cylinder, the upper cylinder cover, the lead screw pair, the piston, the cylinder body, and the lower cylinder cover.

[0039] Specifically, when dismantling the relay digital cylinder and the hydraulic cylinder connecting pipeline, the relay digital cylinder, the hydraulic cylinder connecting pipeline and the pressure measuring pipe that need to be dismantled should be removed separately, and the oil accumulated in the pipeline should be drained. The two ends of the pipeline should be wrapped and protected to prevent impurities from entering the hydraulic cylinder connecting pipeline, so as to ensure the normal use of the hydraulic cylinder connecting pipeline after reassembly and improve the maintenance quality.

[0040] When dismantling and lifting the digital cylinder of the relay unit, securely fix the digital cylinder with a hand chain hoist, remove the four M20×60 socket head cap bolts connecting the digital cylinder to the upper cylinder cover, and crank the stepper motor handle on the top of the digital cylinder towards the valve opening direction to remove the lead screw of the digital cylinder lead screw auxiliary machine upward. Simultaneously, use the hand chain hoist to pull the digital cylinder vertically upward until the flange connecting the upper end of the lead screw auxiliary machine comes off the upper cylinder cover. Remove the ten socket head cap bolts connecting the upper end of the lead screw auxiliary machine to detach the lead screw auxiliary machine from the digital cylinder. After lifting the digital cylinder to a certain height, slide it horizontally and lower it onto the pre-arranged sleepers next to it and lay it down steadily. Cover it with a clean white cloth and take measures to prevent it from tipping over and rolling.

[0041] When removing and lifting the upper cylinder head of the relay, remove the 20 M30×370 connecting bolts that connect the upper cylinder head to the cylinder body. Use a hand hoist to lift the upper cylinder head vertically and then move it horizontally down onto the clean soft pad placed on the traveling platform.

[0042] When removing the lead screw assembly, remove the 10 socket head cap bolts connecting the lead screw assembly to the lifting rod, take out the lead screw assembly, wrap it with a clean cloth, mark it with a number, and place it in a clean parts box.

[0043] When dismantling and lifting the relay piston, remove the 16 M16×80 connecting bolts of the piston super nut, take out the piston super nut and special washer, wrap them in clean silk cloth, mark them, and place them in a clean parts box. Use an M12 lifting ring to vertically lift the piston out of the cylinder body and lower it horizontally onto the clean soft pads arranged on the traveling platform.

[0044] When dismantling and lifting the servo cylinder body, remove the water turbine room walking platform under the servo without affecting the lifting of the servo cylinder body. Remove the 20 M30×380 connecting bolts connecting the servo cylinder body and the lower cylinder cover. Vertically and slowly lift the cylinder body until it is completely detached from the lifting rod. Move it horizontally and lower it steadily onto the arranged sturdy and reliable support fixture. Wrap both ends with clean silk cloth to prevent foreign objects from entering.

[0045] When removing and lifting the lower cylinder head of the relay, use a hand chain hoist to slowly and vertically lift the lower cylinder head until it is completely detached from the lifting rod. Then, move it horizontally and lower it onto the clean soft pad placed on the traveling platform. During the lifting process, ensure that the lower cylinder head is level and lifted vertically throughout the process. Control the lifting speed and lift slowly to prevent scratching the lifting rod.

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

[0047] Specifically, carefully inspect the surfaces of the lifting rod and lower cylinder head bushing for scale and wear marks. Check the lifting rod oil seal and water seal for aging and wear. Determine the cause of oil leakage in the cylinder, and record and photograph the inspection. Thoroughly clean the disassembled components, including the upper and lower cylinder heads, piston, cylinder block, and lower cylinder head bushing. Remove the lower cylinder head lifting rod dust seal, stepped shaft ring, XY shaft ring, square shaft ring, lower cylinder head bottom seal, upper and lower cylinder head and cylinder block seal, piston seal, and guide ring. Thoroughly clean the mounting grooves of each seal ring and install corresponding qualified new seal rings and guide rings. Before installation, check that the specifications, material, and quality of the seal rings and guide rings are up to standard. The seal rings must pass on-site inspection by the manufacturer's technicians and meet the installation requirements. During installation, pay attention to the installation position and orientation of each seal ring and the assembly. Figure 1 Note that stepped rings and XY rings for shafts are directional and must be installed strictly according to the orientation shown in the assembly drawing.

[0048] In some embodiments, in step S5, multiple disassembled components are reassembled sequentially in the order of last disassembled first to ensure efficient disassembly and reassembly operations and avoid missing any components during reassembly.

[0049] Specifically, during reassembly, after thoroughly inspecting and cleaning the disassembled components, check that the lifting rod surface is free of defects, and that the lifting rod seal, cylinder head seal, and piston seal are correctly reinstalled. After a comprehensive inspection confirms no abnormalities, apply turbine oil evenly to the cylinder head and inner wall of the cylinder body for sufficient lubrication. Begin reassembly in the following order: cylinder head reassembly - cylinder body reassembly - lower cylinder head and cylinder body connecting bolt reassembly and tightening - piston reassembly - piston super nut installation - lead screw assembly reassembly - upper cylinder head reassembly - upper cylinder head connecting bolt reassembly - digital cylinder reassembly and docking lead screw assembly - digital cylinder connecting bolt reassembly - hydraulic lines and pressure testing pipe reassembly.

[0050] When reinstalling the cylinder head, cylinder block, and piston, control the descent speed of the hand chain hoist to ensure a completely vertical descent and prevent the cylinder head, cylinder block, piston, and lifting rod from scraping. During the reinstallation process, strictly monitor each sealing structure for any abnormal jamming or jumping out of the groove. All connecting bolts must be tightened in a symmetrical and phased manner until they are in place.

[0051] In some embodiments, during step S5, when performing the pressure test, the valve servoir under repair is pressurized with oil to conduct a pressure test to confirm that there is no leakage in any part of the valve servoir.

[0052] Specifically, after completing the reinstallation of the cylinder valve relay, during the pressure test, the cylinder is filled with hydraulic oil, and the cylinder valve relay is pressurized to 7.5MPa using a hydraulic pump. After checking that there are no leaks in any part of the relay, the digital cylinder of the relay is reinstalled and the transmission rod and the relay connection pipeline are connected.

[0053] Open the main oil supply valve of the cylinder valve to complete the venting operation of the relay. When venting, disconnect the upper chamber pressure test pipe joint and shake the digital cylinder stepper motor handle back and forth to vent until there is no gas or bubbles in the discharged oil. Thoroughly check all parts of the relay for leaks to ensure the quality of maintenance.

[0054] In some embodiments, after the pressure test is completed and no leaks are found in any part, the hydraulic system of the unit's cylinder valve is pressurized and vented as a whole. Then, the mounting bolts of the cylinder valve body are removed. After observing that the pressure in the upper and lower chambers of the cylinder valve servo cylinder is normal, the cylinder valve is subjected to multiple small opening tests. After the small opening and closing is normal, multiple full-stroke full-close and full-open tests are performed to ensure that the cylinder valve opens and closes normally and has good synchronization.

[0055] Optionally, after the cylinder valve servo is reinstalled, the lifting assembly is disassembled and the bottom cover plate of the lower outrigger is reinstalled.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A disassembly and repair process for a cylinder valve relay in a turbine pit, based on a hydro-generator set, the hydro-generator set including a turbine cylinder valve relay and a generator lower frame, the cylinder valve relay being installed on the turbine chamber top cover and connected to the valve body of the cylinder valve, the lower frame being located above the turbine chamber top cover and including a central body and lower support arms disposed around the central body, the lower support arms being located in the upper space of the cylinder valve relay, characterized in that... The process includes the following steps: S1: Determine the location of the valve relay to be disassembled and repaired, remove the bottom cover plate of the lower support arm corresponding to the valve relay, and determine the lifting point position in the cavity of the lower support arm corresponding to the installation position of the valve relay to be disassembled and repaired. S2: Install the lifting assembly at the lifting point and adjust the position of the traction component in the lifting assembly to ensure that the vertical movement trajectory of the traction component coincides with the axis of the cylinder valve servoir. S3: Following the assembly process of the cylinder valve servo, the components of the cylinder valve servo are disassembled and lifted sequentially using the lifting assembly. S4: Inspect each component of the disassembled cylinder valve relay one by one to confirm whether the component is worn or failed, and replace the worn or failed component; S5: Using the lifting assembly, the repaired and replaced parts are reassembled according to the assembly process and subjected to a pressure test; The lifting assembly includes a support member and a connector. The support member is located in the cavity of the lower support arm, corresponding to the cylinder valve relay. The connector is slidably mounted on the support member, and the traction member is connected to the connector. In step S2, the position of the traction member is calibrated by adjusting the position of the connector relative to the support member.

2. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 1, characterized in that, In step S3, before disassembling the cylinder valve servo, the cylinder valve body is adjusted to the fully open state using the cylinder valve servo, and the cylinder valve body is hung up using the mounting bolts.

3. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 2, characterized in that, In step S5, during the pressure test, the valve servoir under repair is pressurized with oil to conduct a pressure test to confirm that there is no leakage in any part of the valve servoir.

4. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 3, characterized in that, After the pressure test is completed and no leaks are found in any part, the hydraulic system of the unit's cylinder valve is pressurized and vented. Then, the mounting bolts of the cylinder valve body are removed. After observing that the pressure in the upper and lower chambers of the cylinder valve servo cylinder is normal, the cylinder valve body is subjected to multiple full-close and full-open tests through the cylinder valve servo to ensure that there are no leaks in any part of the cylinder valve servo and that the cylinder valve opening and closing action is normal.

5. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 1, characterized in that, In step S3, the multiple components of the valve relay are disassembled in sequence according to the order of digital cylinder of the relay, hydraulic pipeline connecting the oil cylinder, upper cylinder cover, lead screw pair, piston, cylinder body and lower cylinder cover. In step S5, the disassembled components are reassembled in sequence according to the order of last disassembled and first reassembled.

6. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 5, characterized in that, In step S3, when disconnecting the hydraulic lines connecting the digital cylinder and the oil cylinder of the relay, drain the oil accumulated in the lines and wrap and protect both ends of the lines.

7. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 1, characterized in that, In step S4, when inspecting the disassembled parts, the lifting rod seal, cylinder head seal and piston seal are disassembled, each seal is cleaned and inspected, the seal mounting groove is cleaned, and worn or failed seals are replaced.

8. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 1, characterized in that, In step S5, when reassembling multiple components, the surface of the lifting rod, as well as the cylinder head and inner wall of the cylinder, are lubricated, and it is observed whether there is any jamming or skipping of the sealing structure during the reassembly process.

9. The disassembly and repair process of the inner cylinder valve relay device in the machine pit according to claim 1, characterized in that, The inner walls 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 parts is adjustable along the extension direction of the lower support arm. 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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