Dismounting device and method for valve shaft of medium-pressure main steam valve

Abstract

The invention provides a medium-pressure main steam valve shaft dismounting device and method, and relates to the technical field of medium-pressure main steam valve shaft dismounting, the medium-pressure main steam valve shaft dismounting device comprises a supporting seat, a supporting rod, a locking piece and a jack, the supporting seat and the supporting rod are slidably connected in the axial direction of the supporting rod, and the axial direction of the supporting rod is the axial direction of a medium-pressure main steam valve shaft; the end, away from the supporting base, of the supporting rod is suitable for being connected with a medium-pressure main steam valve rocker arm. The locking piece can lock the supporting base and the supporting rod when the supporting base slides to any position relative to the supporting rod. The mounting end of the jack is connected with the supporting seat, the telescopic end of the jack is suitable for abutting against the medium-pressure main steam valve shaft, and the jack can push the medium-pressure main steam valve shaft to slide in the axial direction of the medium-pressure main steam valve shaft relative to the medium-pressure main steam valve seat. The jack can be used for ejecting the medium-pressure main steam valve shaft out of the medium-pressure main steam valve seat, operation is convenient and fast, time and labor are saved, and the risk that the valve shaft is strained is reduced.

Description

Technical Field

[0001] This invention relates to the field of medium-pressure main steam valve shaft disassembly technology, and in particular to a device and method for disassembling a medium-pressure main steam valve shaft. Background Technology

[0002] The intermediate-pressure main steam valve is a crucial component of the turbine's steam inlet system. It does not participate in load regulation and has only two positions: fully open and fully closed. When any turbine tripping protection device is activated, the intermediate-pressure main steam valve should be able to close quickly to achieve shutdown. As a key component controlling the opening and closing of the intermediate-pressure main steam valve, the valve shaft's performance directly affects the valve's response within the turbine. Therefore, the valve shaft of the intermediate-pressure main steam valve needs to be inspected regularly to ensure the turbine's operational safety.

[0003] Due to the limited space available for operation in related technologies, such as the turbine casing and other production equipment, the valve shaft is usually removed from the intermediate-pressure main steam valve by manual means of prying and hammering. This is not only time-consuming and labor-intensive, but also prone to causing seal breakage or valve shaft damage due to improper operation. Summary of the Invention

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

[0005] Therefore, one embodiment of the present invention provides a medium-pressure main steam valve shaft disassembly device, which can use a jack to push the medium-pressure main steam valve shaft out of the medium-pressure main steam valve seat. The device is convenient to operate, saves time and effort, and reduces the risk of valve shaft damage.

[0006] Another embodiment of the present invention provides a method for disassembling the valve shaft of a medium-pressure main steam valve.

[0007] According to an embodiment of the present invention, a medium-pressure main steam valve shaft disassembly device includes a support base, a support rod, a locking member, and a jack. The support base and the support rod are slidably connected along the axial direction of the support rod, the axial direction of the support rod being the axial direction of the medium-pressure main steam valve shaft. One end of the support rod away from the support base is adapted to be connected to the rocker arm of the medium-pressure main steam valve. The locking member can lock the support base and the support rod when the support base slides to any position relative to the support rod. The mounting end of the jack is connected to the support base, and the telescopic end of the jack is adapted to abut against the medium-pressure main steam valve shaft. The jack can push the medium-pressure main steam valve shaft to slide relative to the medium-pressure main steam valve seat along the axial direction of the medium-pressure main steam valve shaft.

[0008] According to an embodiment of the present invention, the medium-pressure main steam valve shaft disassembly device, consisting of a support base, a support rod, and a locking component, can construct a rigid support frame structure on the medium-pressure main steam valve. This allows a jack to be mounted on the support frame to push out the valve shaft. Since the support base and support rod are slidably connected along the axial direction of the support rod, the distance between the support base and the rocker arm of the medium-pressure main steam valve can be adjusted on the support rod, causing the support base to deflect relative to the valve shaft. This indirectly adjusts the coaxiality between the jack on the support base and the valve shaft, ensuring that the jack and valve shaft remain in the same direction during disassembly. This effectively avoids the problem of radial offset (i.e., tilting) of the valve shaft when sliding along the valve seat due to a misalignment of the disassembly force direction with the valve shaft axial direction, which could lead to valve shaft damage or seal breakage. Therefore, compared to related technologies, the present invention can use a jack to push the valve shaft out of the medium-pressure main steam valve seat, offering convenient operation, saving time and effort, and reducing the risk of valve shaft damage.

[0009] In some embodiments, the support base, the support rod, and the rocker arm of the medium-pressure main steam valve together define an installation area, and the jack is located in the installation area.

[0010] In some embodiments, the support base includes a frame surrounding a mounting cavity, the frame having a mounting surface facing the mounting end of the jack, the mounting surface being connected to and in surface contact with the mounting end of the jack.

[0011] In some embodiments, the support base further includes a support reinforcement block disposed in the mounting cavity and corresponding to the mounting end of the jack.

[0012] In some embodiments, the support base further includes reinforcing ribs disposed in the mounting cavity, and there are at least one reinforcing rib and they are arranged at intervals in the mounting cavity.

[0013] In some embodiments, the support base has a through hole extending through the support base along its thickness direction, the thickness direction of the support base is consistent with the axial direction of the support rod, at least a portion of the support rod passes through the through hole and is threadedly connected to the locking member, the locking member abuts against the support base, and the locking member and the jack are respectively disposed on both sides of the support base along its thickness direction; The support rod is a screw, and the locking element is a nut.

[0014] In some embodiments, there are at least two support rods arranged at intervals, with at least two support rods respectively located on both sides of the jack along the extension direction of the support base, and the extension direction of the support base being orthogonal to the axial direction of the support rods; There are at least two locking components, each corresponding to one of the support rods.

[0015] In some embodiments, the mounting end of the jack is slidably connected to the support base along the extension direction of the support base and can be locked when slid to any position to adjust the level of the jack relative to the valve shaft of the medium-pressure main steam valve. The extension direction of the support base is orthogonal to the axial and vertical directions of the support rod.

[0016] In some embodiments, the mounting end of the jack is detachably connected to the support base.

[0017] In some embodiments, the mounting end of the jack is magnetically connected to the support base.

[0018] According to an embodiment of the present invention, a method for disassembling a medium-pressure main steam valve shaft, based on the disassembly device described in any of the above embodiments, includes the following steps: Prepare to install the support base on the rocker arm of the medium-pressure main steam valve using the support rod; Coaxiality adjustment: Adjust the distance between the support seat and the rocker arm of the medium-pressure main steam valve on the support rod to adjust the coaxiality between the jack and the valve shaft of the medium-pressure main steam valve; Disassembly is performed by pushing the valve shaft of the medium-pressure main steam valve relative to the valve seat of the medium-pressure main steam valve along the axial direction of the valve shaft, thereby pushing out the valve shaft of the medium-pressure main steam valve.

[0019] The technical advantages of the medium-pressure main steam valve shaft disassembly method according to the present invention are the same as those of the above-described medium-pressure main steam valve shaft disassembly device, and will not be repeated here.

[0020] In some embodiments, prior to the disassembly operation, the disassembly method further includes the step of: The horizontality is adjusted by adjusting the mounting position of the jack's mounting end on the support base to adjust the horizontality of the jack and the valve shaft of the medium-pressure main steam valve.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the connection structure of the medium-pressure main steam valve shaft disassembly device and the medium-pressure main steam valve rocker arm according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the support base in the medium-pressure main steam valve shaft disassembly device according to an embodiment of the present invention.

[0024] Figure 3This is a flowchart illustrating the method for disassembling the valve shaft of the medium-pressure main steam valve according to an embodiment of the present invention.

[0025] Figure label: 1. Support base; 11. Frame; 12. Mounting cavity; 13. Mounting surface; 14. Support reinforcement block; 15. Reinforcing rib plate; 16. Through hole; 2. Support rod; 3. Locking components; 4. Jack; 41. Jack mounting end; 42. Jack extension end; 5. Installation area. Detailed Implementation

[0026] 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.

[0027] like Figure 1 As shown, an embodiment of the present invention provides a medium-pressure main steam valve shaft disassembly device, comprising a support base 1, a support rod 2, a locking member 3, and a jack 4. The support base 1 and the support rod 2 are slidably connected along the axial direction of the support rod 2, which is the axial direction of the medium-pressure main steam valve shaft. One end of the support rod 2 away from the support base 1 is adapted to be connected to the rocker arm of the medium-pressure main steam valve. The locking member 3 can lock the support base 1 and the support rod 2 when the support base 1 slides relative to the support rod 2 to any position. The mounting end 41 of the jack is connected to the support base 1, and the telescopic end 42 of the jack is adapted to abut against the medium-pressure main steam valve shaft. The jack 4 can push the medium-pressure main steam valve shaft relative to the medium-pressure main steam valve seat to slide along the axial direction of the medium-pressure main steam valve shaft, so that the medium-pressure main steam valve shaft can be disengaged from the medium-pressure main steam valve seat.

[0028] According to an embodiment of the present invention, the medium-pressure main steam valve shaft disassembly device, consisting of a support base 1, a support rod 2, and a locking member 3, can construct a rigid support frame structure on the medium-pressure main steam valve. This allows a jack 4 to be installed on the support frame to push out the valve shaft of the medium-pressure main steam valve. Since the support base 1 and the support rod 2 are slidably connected along the axial direction of the support rod 2, the distance between the connection point of the support base 1 and the support rod 2 and the rocker arm of the medium-pressure main steam valve can be adjusted, causing the support base 1 to deflect relative to the valve shaft of the medium-pressure main steam valve, indirectly achieving... The coaxiality of the jack 4 on the support base 1 and the valve shaft of the medium-pressure main steam valve is adjusted so that the jack 4 can keep in the same direction as the valve shaft during disassembly. This effectively avoids the problem that the valve shaft may be radially offset (i.e., tilted) when sliding along the valve seat due to the inconsistency between the direction of the disassembly force and the axial direction of the valve shaft, which could lead to damage to the valve shaft or breakage of the seal. Therefore, compared with related technologies, this invention can use the jack 4 to push the valve shaft of the medium-pressure main steam valve out of the valve seat, which is convenient, time-saving, labor-saving and reduces the risk of valve shaft damage.

[0029] Specifically, the axial direction of the support rod and the axial direction of the intermediate pressure main steam valve shaft can both be in the left-right direction as shown in the figure. The jack can be, but is not limited to, a hydraulic jack, a hydraulic jack, a pneumatic jack, an electric jack, or other structures capable of extension and retraction; no specific limitation is made here.

[0030] like Figure 1 As shown, in some embodiments, the support base 1, the support rod 2, and the rocker arm of the medium-pressure main steam valve jointly define the installation area 5, and the jack 4 is located in the installation area 5.

[0031] Understandably, placing the jacks in the installation area can make full use of the space between the support frame and the medium-pressure main steam valve, resulting in a high degree of integration of the disassembly device, reducing space occupation, facilitating the deployment of the disassembly device in narrow spaces, and improving its compatibility with various types of medium-pressure main steam valve units.

[0032] It should be noted that due to the influence of production equipment such as turbine casings, the actual working space is limited. Therefore, related technologies usually rely on multiple people working together and relying on experience and feel to adjust the valve shaft of the medium-pressure main steam valve, which weighs tens or even hundreds of kilograms, in a narrow space. This is not only inefficient, but also prone to personal injury or equipment damage accidents. However, the disassembly device of the present invention adopts the above-mentioned structural design, has a small overall size, and can safely and stably push out the valve shaft of the medium-pressure main steam valve in a sufficiently small construction space, and has good unit adaptability.

[0033] like Figure 1 and Figure 2 As shown, in some embodiments, the support base 1 includes a frame 11, the frame 11 having a mounting cavity 12 formed around it, the frame 11 having a mounting surface 13 facing the mounting end 41 of the jack, the mounting surface 13 being connected to and in surface contact with the mounting end 41 of the jack, thereby increasing the contact area between the frame and the jack and improving the reliability of the support base for the jack.

[0034] Understandably, the support base adopts a frame structure, which can reduce the overall weight of the support base, facilitate the lifting operation of the support base when constructing the support frame structure on the medium-pressure main steam valve (i.e., no additional lifting lugs are needed, and the support base can be lifted using the installation cavity), enhance operational flexibility, and facilitate the rapid manufacturing of the support base.

[0035] Furthermore, the frame can be a closed frame formed by connecting multiple steel plates end to end, and the steel plates can be carbon steel plates or other materials that have passed the yield strength test.

[0036] For example, as shown in the figure, the frame can be a closed rectangle formed by connecting four steel plates end to end. The steel plates can be carbon steel plates with a thickness of about 30mm, cut and quickly formed on the maintenance site through simple welding.

[0037] like Figure 2 As shown, in some embodiments, the support base 1 further includes a support reinforcement block 14, which is disposed in the mounting cavity 12 and corresponds to the mounting end 41 of the jack, so as to improve the structural strength of the support base and achieve reliable support for the jack.

[0038] Specifically, the support reinforcement block can be located at the center of the support base to facilitate stable lifting of the support base. The support reinforcement block can be welded to the frame. The specific specifications of the support reinforcement block can be designed by comprehensively considering the specifications of the valve shaft of the medium-pressure main steam valve to be disassembled, the specifications of the jack, etc., to ensure that the structural strength meets the usage requirements. This will not be elaborated further here.

[0039] like Figure 2 As shown, in some embodiments, the support base 1 further includes reinforcing ribs 15, which are disposed in the mounting cavity 12. There are at least one reinforcing rib 15 and they are arranged at intervals in the mounting cavity 12 to further enhance the structural strength of the support base.

[0040] Preferably, at least one reinforcing rib is arranged at equal intervals in the mounting cavity to improve the uniformity of force distribution on the support.

[0041] Specifically, the reinforcing ribs can be welded to the frame. The specific specifications of the reinforcing ribs can be designed by comprehensively considering the specifications of the valve shaft of the medium-pressure main steam valve to be disassembled, the specifications of the jack, etc., to ensure that the structural strength of the support base meets the usage requirements. This will not be elaborated further here. Both the support reinforcement block and the reinforcing ribs can be made of the same material as the frame, and no specific limitations are made here.

[0042] like Figure 1 and Figure 2 As shown, in some embodiments, the support base 1 has a through hole 16 extending through the support base 1 along its thickness direction. The thickness direction of the support base 1 is consistent with the axial direction of the support rod 2. At least a portion of the support rod 2 passes through the through hole 16 and is threadedly connected to the locking member 3. In other words, at least a portion of the support rod is exposed outside the support base and threadedly connected to the locking member. The locking member abuts against the support base, and the locking member and the jack are respectively located on both sides of the support base along its thickness direction.

[0043] Support rod 2 is a screw rod, and locking element 3 is a nut.

[0044] Understandably, by screwing the locking device on the support rod, the locking device can push the support seat to slide along the support rod, thereby adjusting the distance between the connection between the support seat and the support rod and the rocker arm of the medium-pressure main steam valve. This allows for the adjustment of the coaxiality between the jack on the support seat and the valve shaft of the medium-pressure main steam valve, making the adjustment operation simple and convenient.

[0045] Specifically, the through hole can be located between any two adjacent reinforcing ribs so that the support rod and the reinforcing ribs can work together to strengthen the support base.

[0046] Furthermore, the support base also has a pressing surface arranged opposite to the mounting surface along its thickness direction, at least a portion of the support rod is exposed outside the pressing surface, and the locking member abuts and makes surface contact with the pressing surface to increase the contact area between the locking member and the support base, so that the locking member can reliably lock the support base.

[0047] like Figure 1 As shown, in some embodiments, there are at least two support rods 2 arranged at intervals, with at least two support rods 2 respectively located on both sides of the jack 4 along the extension direction of the support base 1, and the extension direction of the support base 1 being orthogonal to the axial direction of the support rods 2.

[0048] There are at least two locking components 3, each corresponding to a support rod 2.

[0049] Understandably, the above structural design can further optimize the support stability of the support frame on the medium-pressure main steam valve, and at the same time help to ensure that the disassembly device is subjected to uniform force during the disassembly process, which is scientific and reasonable.

[0050] Specifically, the extension direction of the support can be the front-to-back direction shown in the figure.

[0051] For example, as shown in the figure, there are two support rods, which are respectively located on both sides of the jack along the extension direction of the support base, and there are two locking parts, which correspond one to one of the support rods.

[0052] like Figure 1 As shown, in some embodiments, the mounting end 41 of the jack is slidably connected to the support base 1 along the extension direction of the support base 1 and can lock the mounting end 41 of the jack and the support base 1 when slid to any position to adjust the level of the jack 4 relative to the valve shaft of the medium-pressure main steam valve. The extension direction of the support base 1 is orthogonal to the axial and vertical directions of the support rod 2.

[0053] Understandably, by changing the position of the jack on the support, the jack can be moved horizontally to adjust the level of the jack and the valve shaft of the medium-pressure main steam valve. Combined with the coaxiality adjustment mentioned above, it can be ensured that the disassembly device remains aligned with the valve shaft of the medium-pressure main steam valve throughout the disassembly process, thereby fundamentally avoiding damage to the valve shaft or the inner wall of the sealing cavity caused by tilting or jamming.

[0054] like Figure 1 As shown, in some embodiments, the mounting end 41 of the jack is detachably connected to the support base 1 so that if one of them is damaged, only the corresponding one needs to be replaced, thus ensuring the service life of the disassembly device and saving costs.

[0055] like Figure 1 As shown, in some embodiments, the mounting end 41 of the jack is magnetically connected to the support base 1. The connection between the jack and the support base is achieved by magnetic attraction, which facilitates the horizontal movement of the jack and completes the leveling operation.

[0056] Therefore, compared with related technologies, the present invention has the following advantages: 1) Lightweight and convenient, with a compact structure, it can be quickly welded from multiple carbon steel pieces, providing flexibility and operability for rapid on-site manufacturing and deployment; 2) Adjustable coaxiality and levelness: By adjusting the position of the support base and jack, ensure that the disassembly device is aligned with the valve shaft of the medium-pressure main steam valve; 3) Good stability, which can avoid damage to the valve shaft and the sealing cavity of the intermediate pressure main steam valve, and improve the quality of disassembly and assembly; 4) Improve efficiency, save maintenance time, and ensure safe operation of equipment.

[0057] In other words, this disassembly device, through the cooperation of the support base, support rod, locking components, and jack, achieves precise horizontal alignment and stable force distribution on the valve shaft during disassembly. This effectively avoids the risk of damage to the precision seals of the medium-pressure main steam valve due to skewed force, as well as the risk of strain on the valve shaft and sealing cavity during disassembly. Furthermore, the scientifically designed force distribution of this disassembly device evenly distributes lifting and propulsion forces throughout the entire device, effectively protecting the valve shaft from bending or deformation during disassembly. This improves maintenance quality and efficiency while ensuring equipment safety.

[0058] Therefore, the present invention has a simple structure, is easy to assemble and disassemble, and does not rely on special equipment or complex technology. It can solve the core pain point of valve shaft being difficult to align during disassembly by using its adjustable screw (i.e. support rod)-nut (i.e. locking part) structure. It effectively replaces the method of relying on pry bars and hammers in related technologies, saving time and manpower, and eliminating the high cost of damage such as seal breakage or valve shaft damage caused by improper operation.

[0059] Practice has proven that after using the disassembly tool of this invention, our driver team found that the valve shaft wear was less than when the disassembly tool was not used, and the disassembly time was shorter after completing the task of disassembling the intermediate pressure main steam valve during the overhaul.

[0060] like Figure 3As shown, an embodiment of the present invention provides a method for disassembling the valve shaft of a medium-pressure main steam valve. Based on the disassembly device of any of the above embodiments, the disassembly method includes the following steps: Step S1, Preparation: Install the support base 1 on the rocker arm of the medium-pressure main steam valve via the support rod 2; Step S2, coaxiality adjustment: Adjust the distance between the support seat 1 and the rocker arm of the medium-pressure main steam valve on the support rod 2 to adjust the coaxiality between the jack 4 and the valve shaft of the medium-pressure main steam valve. Step S3, disassembly: the jack 4 pushes the valve shaft of the intermediate pressure main steam valve to slide relative to the valve seat of the intermediate pressure main steam valve along the axial direction of the valve shaft, so as to push out the valve shaft of the intermediate pressure main steam valve.

[0061] The technical advantages of the medium-pressure main steam valve shaft disassembly method according to the present invention are the same as those of the above-described medium-pressure main steam valve shaft disassembly device, and will not be repeated here.

[0062] like Figure 3 As shown, in some embodiments, before step S3, the disassembly method further includes the step of: Step S2', Leveling adjustment: Adjust the mounting position of the jack 41 on the support 1 to adjust the level of the jack 4 and the valve shaft of the medium-pressure main steam valve.

[0063] It is understood that in some embodiments of the present invention, the method for disassembling the intermediate-pressure main steam valve shaft includes steps S1, S2, and S3; in other embodiments, the method includes steps S1, S2, S2', and S3. It should be noted that in this embodiment, steps S2 and S2' are not limited in any particular order. Therefore, the method for disassembling the intermediate-pressure main steam valve shaft of the present invention can be either of the two methods described above.

[0064] 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 are not intended to 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.

[0065] 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 technical features indicated. 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.

[0066] 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.

[0067] 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.

[0068] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the 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.

[0069] 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 device for disassembling the valve shaft of a medium-pressure main steam valve, characterized in that, include: The support base, the support rod, and the locking element are provided. The support base and the support rod are slidably connected along the axial direction of the support rod, which is the axial direction of the valve shaft of the medium-pressure main steam valve. The end of the support rod away from the support base is adapted to be connected to the rocker arm of the medium-pressure main steam valve. The locking element can lock the support base and the support rod when the support base slides to any position relative to the support rod. The jack has its mounting end connected to the support base, and its telescopic end adapted to abut against the valve shaft of the medium-pressure main steam valve. The jack can push the valve shaft of the medium-pressure main steam valve to slide relative to the valve seat of the medium-pressure main steam valve along the axial direction of the valve shaft.

2. The medium-pressure main steam valve shaft disassembly device according to claim 1, characterized in that, The support base, the support rod, and the rocker arm of the medium-pressure main steam valve together define an installation area, and the jack is located in the installation area.

3. The medium-pressure main steam valve shaft disassembly device according to claim 1, characterized in that, The support base includes a frame, the frame having a mounting cavity formed around it, the frame having a mounting surface facing the mounting end of the jack, the mounting surface being connected to and in surface contact with the mounting end of the jack.

4. The medium-pressure main steam valve shaft disassembly device according to claim 3, characterized in that, The support base also includes: A supporting reinforcement block, wherein the supporting reinforcement block is disposed in the mounting cavity and corresponds to the mounting end of the jack; and / or, A reinforcing rib is disposed in the mounting cavity, and there is at least one reinforcing rib arranged at intervals in the mounting cavity.

5. The medium-pressure main steam valve shaft disassembly device according to claim 1, characterized in that, The support base is provided with a through hole extending through the support base along its thickness direction. The thickness direction of the support base is consistent with the axial direction of the support rod. At least a portion of the support rod passes through the through hole and is threadedly connected to the locking member. The locking member abuts against the support base. The locking member and the jack are respectively located on both sides of the support base along its thickness direction. The support rod is a screw, and the locking element is a nut.

6. The medium-pressure main steam valve shaft disassembly device according to claim 1, characterized in that, The support rods are at least two and spaced apart, with at least two support rods located on both sides of the jack along the extension direction of the support base, and the extension direction of the support base is orthogonal to the axial direction of the support rods; There are at least two locking components, each corresponding to one of the support rods.

7. The medium-pressure main steam valve shaft disassembly device according to any one of claims 1-6, characterized in that, The mounting end of the jack is slidably connected to the support base along the extension direction of the support base and can be locked when slid to any position to adjust the level of the jack relative to the valve shaft of the medium-pressure main steam valve. The extension direction of the support base is orthogonal to the axial and vertical directions of the support rod.

8. The medium-pressure main steam valve shaft disassembly device according to claim 7, characterized in that, The mounting end of the jack is detachably connected to the support base.

9. A method for disassembling the valve shaft of a medium-pressure main steam valve, based on the disassembly device as described in any one of claims 1-8, characterized in that, The disassembly method includes the following steps: Prepare to install the support base on the rocker arm of the medium-pressure main steam valve using the support rod; Coaxiality adjustment: Adjust the distance between the support seat and the rocker arm of the medium-pressure main steam valve on the support rod to adjust the coaxiality between the jack and the valve shaft of the medium-pressure main steam valve; Disassembly is performed by pushing the valve shaft of the medium-pressure main steam valve relative to the valve seat of the medium-pressure main steam valve along the axial direction of the valve shaft, thereby pushing out the valve shaft of the medium-pressure main steam valve.

10. The method for disassembling the valve shaft of the medium-pressure main steam valve according to claim 9, characterized in that, Prior to the disassembly operation, the disassembly method further includes the following steps: The horizontality is adjusted by adjusting the mounting position of the jack's mounting end on the support base to adjust the horizontality of the jack and the valve shaft of the medium-pressure main steam valve.

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