Centering tool for whole-circle stationary blade sealing ring

Abstract

The utility model discloses a centering tool for a whole-circle stationary blade sealing ring, which belongs to the field of gas turbines and comprises a measuring rod, a positioning adjusting device and a length measuring instrument mounted on the measuring rod. The two groups of positioning and adjusting devices are respectively arranged at two ends of the measuring rod, each group of positioning and adjusting device further comprises at least two first rolling pieces, and the length measuring instrument is arranged on the measuring rod; when the stationary blade sealing ring is centered, the axial direction of the stationary blade sealing ring is in the vertical direction, the measuring rod is transversely arranged above the stationary blade sealing ring, the rolling ends of the two first rolling pieces in each set of positioning adjusting device abut against the upper end and the outer side wall of the stationary blade sealing ring respectively, and the measuring end of the length measuring instrument right faces or abuts against the inner side wall of the stationary blade sealing ring. The centering tool not only improves the efficiency of assembling the stationary blade sealing ring, but also does not need to additionally process an auxiliary process groove and the like on a blade ring body or other parts of a gas turbine, and can improve the centering efficiency and precision of the stationary blade sealing ring.

Description

Technical Field

[0001] The utility model belongs to the field of gas turbines, and in particular relates to a centering tool for a full circle of stationary blade sealing rings. Background Art

[0002] The gas turbine is mainly composed of three major components: compressor, combustion chamber and turbine. Air enters the compressor component from the air intake system. The high-pressure air after flowing through the compressor enters the combustion chamber for full combustion, and then passes through the turbine component to complete energy conversion. In order to reduce the leakage of high-temperature and high-pressure gas into the chamber between the turbine stator and the rotor, a sealing structure needs to be set between the turbine stator and the rotor. This structure can not only form an effective seal between the turbine stator and the intermediate gas seal, but also adapt to the expansion incoordination between the turbine blades and the intermediate gas seal caused by the temperature difference. We usually call it the stator seal ring.

[0003] In order to improve the sealing effect of the stationary blade seal ring, the surface of the stationary blade seal ring is usually hardened or coated with wear-resistant materials. In addition to materials and surface treatment, the design and centering of the stationary blade seal ring are also the key to its success. It must be able to fit the surface of the blade tightly to prevent gas leakage. In order to achieve the best sealing effect, the stationary blade seal ring usually requires a lot of testing and optimization. The location and typical structure of the stationary blade seal ring are as follows: Figure 1 As shown:

[0004] Figure 1 Among them, (3) is the blade ring body, (2) is the turbine stator blade, (21) is the heat insulation ring connecting (3) the blade ring body and (2) the turbine stator blade, (4) is a part of the gas turbine rotor, and (1) is the above-mentioned stator blade sealing ring. They divide the space into several chambers A, B, D, E and F, wherein chamber A is composed of (3) the blade ring body, (21) the heat insulation ring and (2) the turbine stator blade, chamber B is composed of (2) the turbine stator blade and (1) the stator blade sealing ring, chamber D is composed of (1) the stator blade sealing ring and (4) the rotor, and chambers E and F are both composed of (2) the turbine stator blade, (1) the stator blade sealing ring and (4) the rotor. Moreover, chamber A and chamber B are connected through (2) the turbine stator blade, chamber B and chamber D are connected through (1) the stator blade sealing ring, and chamber D and chamber E and chamber F are all connected through the gap between (1) the stator blade sealing ring and (4) the rotor. The cooling air flows from chamber A through chamber B and then into chamber D, and then flows into the mainstream area through chambers E and F, cooling the rotor and preventing the intrusion of gas in the mainstream area. When the gas turbine is actually running, the pressure stability requirements of each chamber are relatively high. If there is air leakage in individual chambers, the local cooling effect will be weakened, causing serious accidents such as overheating or even burning of components.

[0005] In order to ensure that the cooling air from chamber D flows into chambers E and F more evenly, the gap between (1) the stationary blade seal ring and (4) the rotor must be relatively uniform. If the design is not uniform, the side with a larger gap will cause an increase in gas flow, and the side with a smaller gap will cause a decrease in gas flow, which will inevitably have a greater impact on the circumferential temperature distribution of the parts, and long-term operation will easily cause problems such as bending and deformation of the parts. Therefore, during the installation stage, it is necessary to ensure that (1) the stationary blade seal ring and (3) the blade ring body have good concentricity.

[0006] At present, the main assembly in the workshop is to verify the center of the stationary blade sealing ring after finding the center of the blade ring on the machine tool, or to place a dial indicator after finding the 4 points on the left and right of the stationary blade sealing ring, and ensure that the position of the indicator does not change during the assembly process. Since the machine tool centering will occupy the machine tool and cannot be adjusted in real time due to space limitations, the 4-point fixed position dial indicator will change with the assembly time, and even accidental touch during assembly will affect the centering effect.

[0007] Therefore, it is necessary to provide a stationary blade sealing ring centering tool to solve the above problems. Utility Model Content

[0008] The embodiment of the utility model provides a tool for centering a full circle of stationary blade sealing rings to solve the problems in the prior art.

[0009] The embodiment of the utility model adopts the following technical scheme: a full-circle stationary blade sealing ring centering tool, the centering tool is used to center the stationary blade sealing ring and the blade ring body, the stationary blade sealing ring is assembled on the turbine stationary blade, and the turbine stationary blade is assembled on the blade ring body through the insulation ring, the centering tool includes a measuring rod, a positioning adjustment device and a length measuring instrument installed on the measuring rod; the positioning adjustment device is configured with two groups and is respectively installed at both ends of the measuring rod, each group of positioning adjustment devices also includes at least two first rolling elements, and the length measuring instrument is installed on the measuring rod; when the stationary blade sealing ring is centered, its axial direction is vertical, the measuring rod is placed horizontally above the stationary blade sealing ring, the rolling ends of the two first rolling elements in each group of positioning adjustment devices respectively abut against the upper end and the outer side wall of the stationary blade sealing ring, and the measuring end of the length measuring instrument is directly opposite to or abuts against the inner side wall of the stationary blade sealing ring.

[0010] Preferably, each group of positioning and adjusting devices is at least partially slidably connected to the measuring rod in the axial direction of the measuring rod, and a group of first locking members are provided to lock the relative position of the positioning and adjusting devices and the measuring rod.

[0011] Preferably, the positioning and adjusting device further comprises an adjusting rod, one end of which is provided with a slide groove extending along its axial direction, and the measuring rod is slidably matched with the slide groove at one end corresponding to the positioning and adjusting device.

[0012] Preferably, the positioning and adjustment device also includes at least one fixing frame and a supporting frame fixedly connected to the outer end of the adjustment rod, the fixing frame and the supporting frame are detachably connected and the relative torsion angle between the two is adjustable, and the two first rolling elements are both mounted on the fixing frame.

[0013] Preferably, the positioning and adjustment device also includes at least one second fixing screw, the support frame is provided with at least one first threaded hole, and the fixing frame is formed with a threaded rod portion threadedly connected to the first threaded hole, and a stable connection between the support frame and the fixing frame is achieved by the second fixing screw passing through the support frame and resting against the fixing frame to be locked.

[0014] Preferably, the support frame includes a cross bar and two vertical bars respectively fixedly connected to the two ends of the cross bar, the cross bar is fixedly connected to the adjustment rod, and the first threaded holes are configured with two and are respectively located at the ends of the two vertical bars; the fixing frame is also configured with two groups and corresponds to the two vertical bars one by one, the two fixing frames are respectively locked in the first threaded holes on the corresponding vertical bars by two second fixing screws, and two first rolling members are installed on each fixing frame.

[0015] Preferably, the first locking member comprises a first set screw, which passes through the corresponding adjusting rod and is pressed against the measuring rod to be locked so that the adjusting rod is locked on the measuring rod.

[0016] Preferably, the length measuring instrument is configured as a dial indicator, a micrometer, or a laser rangefinder.

[0017] At least one of the above technical solutions adopted in the embodiment of the utility model can achieve the following beneficial effects:

[0018] Firstly, compared with conventional machine tool centering and fixed-point dialing methods for centering the vane sealing ring, the utility model uses a vane sealing ring centering tool to verify the centering situation anytime and anywhere, which is not only convenient for centering during the installation of the vane sealing ring, but also easy to achieve center verification after the installation is completed, greatly improving the efficiency of assembling the vane sealing ring; and when using the centering tool, there is no need to additionally process auxiliary process grooves on the vane ring body or other parts of the gas turbine, which can also improve the efficiency and accuracy of the vane sealing ring centering.

[0019] Secondly, the utility model can quickly verify the centering situation through the centering tool, and there is no need to hoist it onto the machine tool for centering many times. Compared with the original complete stator blade sealing ring centering which requires at least 2-4 machine tool measurements, the centering tool can greatly save the cost of machine tool use and reduce the assembly cost of the stator blade sealing ring.

[0020] Thirdly, the centering tool can be used to center the sealing rings of stator blades of different sizes, thus avoiding the adverse effects of different centering methods. By using a set of centering tools to center the sealing rings of multi-stage turbine stator blades of gas turbines, the centering data can be quickly compared, the centering data can be quantified, and the assembly quality can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 It is a schematic assembly diagram of a typical structure of a gas turbine where a stationary blade sealing ring of the utility model is located;

[0023] Figure 2 This is a schematic diagram of the assembly of the centering tool of the utility model when in use;

[0024] Figure 3 For this utility model Figure 2 A local enlarged view of point A in FIG.

[0025] Figure 4 This is a top view schematic diagram of the centering tool of the utility model when in use;

[0026] Figure 5 A top view of the centering tool of the utility model;

[0027] Figure 6 A side view of the centering tool of the utility model;

[0028] Figure 7 It is a connection diagram of the fixing frame and the supporting frame of the utility model.

[0029] Reference numerals

[0030] 1-static blade sealing ring; 2-turbine static blade; 21-insulation ring; 3-blade ring body; 4-rotor; 5-measuring rod; 6-positioning adjustment device; 61-first rolling element; 62-first locking element; 621-first set screw; 63-adjusting rod; 631-slide groove; 64-fixing frame; 641-threaded rod; 65-support frame; 651-first threaded hole; 652-cross bar; 653-vertical bar; 66-second set screw; 7-length measuring instrument. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] Reference Figures 1 to 7 As shown, an embodiment of the utility model provides a centering tool for a full circle of stationary blade sealing rings, which is used in the assembly process of a gas turbine. The gas turbine is mainly composed of three major components: a compressor, a combustion chamber and a turbine. Air enters the compressor component from the air intake system, and the high-pressure air after passing through the compressor enters the combustion chamber for full combustion, and then passes through the turbine component to complete energy conversion.

[0034] refer to Figure 1 As shown, in order to prevent high-temperature and high-pressure compressed air from leaking into the chamber between the turbine stator blade 2 and the rotor 4, a sealing structure needs to be provided between the turbine stator blade 2 and the rotor 4. This structure can not only form an effective seal between the turbine stator blade 2 and the intermediate gas seal body, but also adapt to the expansion inconsistency between the turbine stator blade 2 and the intermediate gas seal body caused by the temperature difference. We usually call it a stator blade sealing ring 1. When assembling the stator blade sealing ring 1, firstly assemble the turbine stator blade 2 on the blade ring body 3 through the heat insulation ring 21, and then assemble the sealing ring on the turbine stator blade 2. Subsequently, the stator blade sealing ring 1 and the blade ring body 3 are centered by the centering tool. Finally, the above-mentioned overall structure is assembled on the rotor 4 of the gas turbine to ensure that the radial clearance between the stator blade sealing ring 1 and the gas turbine rotor 4 is uniform throughout the circumference.

[0035] refer to Figures 2 to 6 As shown, the centering tool is used to center the stationary blade sealing ring 1 and the blade ring body 3, and the centering tool includes a measuring rod 5, a positioning adjustment device 6, and a length measuring instrument 7 installed on the measuring rod 5; the positioning adjustment device 6 is configured with two groups and is installed at both ends of the measuring rod 5 respectively, each group of the positioning adjustment device 6 also includes at least two first rolling elements 61, and the length measuring instrument 7 is installed on the measuring rod 5;

[0036] In actual use, the axial direction of the stationary blade sealing ring 1 is placed vertically (such as Figure 2As shown in the figure, the measuring rod 5 is placed horizontally above the stationary blade sealing ring 1, and the rolling ends of the two first rolling elements 61 in each group of positioning and adjusting devices 6 are respectively against the upper end and the outer side wall of the stationary blade sealing ring 1, and the measuring end of the length measuring instrument 7 is directly opposite to or against the inner side wall of the stationary blade sealing ring 1, and the length measuring instrument 7 is configured as a dial indicator or a micrometer or a laser distance meter; when the length measuring instrument 7 adopts a mechanical measuring instrument such as a dial indicator or a micrometer, the measuring end of the dial indicator or the micrometer needs to be against the inner side wall of the stationary blade sealing ring 1, and the measurement can be performed after zeroing; when the length measuring instrument 7 adopts a laser distance meter, it is only necessary to make the measuring end (i.e., the laser emitting end) of the laser distance meter directly opposite to the inner side wall of the stationary blade sealing ring 1, and the laser measuring instrument is zeroed, and it can be used to perform the centering operation on the stationary blade sealing ring 1 and the blade ring body 3;

[0037] In actual factory applications, a dial indicator (i.e. Figure 2 The length measuring instrument 7 shown in the figure is calibrated or measured for centering. Since the two sets of positioning and adjusting devices 6 are respectively located at the two ends of the measuring rod 5, after the two sets of positioning and adjusting devices are installed in place, the measuring rod 5 can be stabilized at a fixed horizontal height, and the initial value of the dial indicator can be confirmed. By cooperating with the staff to push the centering device, the dial indicator on the measuring rod 5 can be rotated around the circumferential direction of the blade ring body 3. The centering condition of the stationary blade sealing ring 1 can be completely reproduced by observing or collecting the value changes of the dial indicator during the entire movement process; if the value of the dial indicator does not change, it means that the centering of the stationary blade sealing ring 1 and the blade ring body 3 is good, and no additional adjustment is required. If the value of the dial indicator fluctuates, it means that the centering of the stationary blade sealing ring 1 and the blade ring body 3 is not good, so the staff needs to fine-tune the position of the stationary blade sealing ring 1 to ensure that the stationary blade sealing ring 1 is installed in place.

[0038] Compared with the conventional machine tool centering and fixed-point metering methods for centering the stationary blade sealing ring 1, the stationary blade sealing ring centering tool can be used to verify the centering situation anytime and anywhere, which is not only convenient for centering during the installation of the stationary blade sealing ring 1, but also easy to achieve center verification after the installation is completed, which greatly improves the efficiency of assembling the stationary blade sealing ring 1. In addition, when using the centering tool, there is no need to additionally process auxiliary process grooves on the blade ring body 3 or other parts of the gas turbine, which can also improve the efficiency and accuracy of centering the stationary blade sealing ring 1.

[0039] Originally, a complete stator blade seal ring 1 centering required at least 2-4 machine tool measurements. Now, the centering tool can quickly verify the centering situation without having to hoist it to the machine tool for centering multiple times, which greatly saves the cost of machine tool use and reduces the assembly cost of the stator blade seal ring 1.

[0040] In some practical applications, the following technical solutions can be adopted:

[0041] refer to Figures 2 to 6 , by at least partially connecting each set of positioning and adjusting devices 6 to the measuring rod 5 in a sliding manner in the axial direction of the measuring rod 5, and by providing a set of first locking members 62 for locking the relative position of the positioning and adjusting devices 6 and the measuring rod 5;

[0042] By slidingly cooperating between the measuring rod 5 and the positioning and adjusting device 6 and locking the two with the first locking member 62, the distance between the two sets of positioning and adjusting devices 6 can be adjusted, so that the centering of the stator sealing rings 1 of different sizes can be achieved through the centering tool, avoiding the adverse effects brought by different centering methods. The centering of the multi-stage turbine stator sealing ring 1 of the gas turbine can be achieved through a set of centering tools, and the data comparison of the centering situation can be realized quickly, the centering data can be quantified, and the assembly quality can be controlled; and the first locking member 62 is used to lock the position of the measuring rod 5, so as to avoid the distance between the two sets of positioning and adjusting devices 6 changing when using or moving the centering tool, thereby affecting the centering calibration of the stator sealing ring 1.

[0043] Specifically, the positioning and adjustment device 6 also includes an adjustment rod 63, one end of which is provided with a slide groove 631 extending along its axial direction. The measuring rod 5 corresponds to one end of the positioning and adjustment device 6 and slides with the slide groove 631, so as to achieve sliding cooperation between the measuring rod 5 and the two groups of positioning and adjustment devices 6, and further achieve adjustable distance between the two groups of positioning and adjustment devices 6, which is convenient for adapting to the centering of stationary blade sealing rings 1 of different sizes.

[0044] In some practical applications, the positioning adjustment device 6 can adopt the following technical solutions:

[0045] The positioning and adjusting device 6 also includes at least one fixing frame 64 and a supporting frame 65 fixedly connected to the outer end of the adjusting rod 63 . The fixing frame 64 and the supporting frame 65 are detachably connected and the relative torsion angle between the two is adjustable. Both first rolling members 61 are mounted on the fixing frame 64 .

[0046] Specifically, the positioning adjustment device 6 further includes at least one second set screw 66 (such as Figure 3 , Figure 6 and Figure 7), the support frame 65 is provided with at least one first threaded hole 651, and the fixing frame 64 is formed with a threaded rod portion 641 threadedly connected to the first threaded hole 651, and a second set screw 66 passes through the support frame 65 and is pressed against the fixing frame 64 to be locked to achieve a stable connection between the support frame 65 and the fixing frame 64. The second set screw 66 is pressed against the fixing frame 64 or directly against the threaded rod portion 641 in a top-pressing manner, which is a common means in the existing art, and will not be described in detail here; in addition, considering that the second set screw 66 is directly pressed against the threaded rod portion 641 for a long time, which will cause thread damage, for this reason, at least part of the threaded rod portion 641 can be set as a bare rod portion (reference Figure 7 As shown), the second set screw 66 is pressed against the smooth rod portion of the threaded rod portion 641, thereby locking the fixing frame 64 and the support frame 65, and preventing the second set screw 66 from damaging the threaded rod portion 641;

[0047] By rotating the threaded rod 641 to connect the fixing frame 64 to the supporting frame 65, the angle of the corresponding first rolling element 61 can be adjusted in time, so as to ensure that the first rolling elements 61 on the two sets of positioning and adjusting devices 6 are symmetrical around the center of the blade ring body 3, that is, the connecting line of the first rolling elements 61 on the two sets of positioning and adjusting devices 6 passes through the central axis of the blade ring body 3, ensuring that the rotation trajectory of the dial indicator remains coaxial with the blade ring body 3, thereby ensuring the accuracy of the centering tool for the stationary blade sealing ring 1.

[0048] One technical solution, refer to Figure 2 and Figure 3 As shown, each set of positioning and adjusting devices 6 can be configured as a fixing frame 64, and two first rolling elements 61 are installed on the fixing frame 64. According to the above principle, the centering of the stationary blade sealing ring 1 can be achieved;

[0049] The second technical solution, refer to Figures 4 to 7 As shown, the support frame 65 includes a cross bar 652 and two vertical bars 653 respectively fixedly connected to the two ends of the cross bar 652, the cross bar 652 is fixedly connected to the adjustment rod 63, and the first threaded holes 651 are configured with two and are respectively located at the ends of the two vertical bars 653; the fixing frame 64 is also configured with two groups and corresponds to the two vertical bars 653 one by one, and the two fixing frames 64 are respectively locked in the first threaded holes 651 on the corresponding vertical bars 653 by two second set screws 66, and two first rolling members 61 are installed on each fixing frame 64;

[0050] Therefore, in the second technical solution, a total of four sets of fixing frames 64 are provided. After the centering tool is installed on the blade ring body 3, the cross-connecting lines of the first rolling elements 61 on the four sets of fixing frames 64 still pass through the central axis of the blade ring body 3. Compared with the first technical solution, the overall stability of the centering tool can be improved.

[0051] Specifically, the first locking member 62 includes a first set screw 621, which passes through the corresponding adjustment rod 63 and is locked against the measuring rod 5 so that the adjustment rod 63 is locked on the measuring rod 5. The locking method of the first set screw 621 can refer to the locking method of the second set screw 66, which will not be described in detail here. After the position of the adjustment device relative to the measuring rod 5 is appropriately adjusted, the second set screw 66 can be used to lock the two.

[0052] Specifically, the first rolling element 61 is configured as a roller or a bearing; in practical applications, a bearing is often used as a rolling element, specifically, the inner ring of the bearing is fixed to the corresponding fixing frame 64 by interference fit, and the rolling end of the first rolling element 61 is the outer ring of the bearing.

[0053] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A centering tool for a full-circle stationary blade sealing ring, the centering tool being used for centering a stationary blade sealing ring (1) and a blade ring body (3), the stationary blade sealing ring (1) being mounted on a turbine stationary blade (2), the turbine stationary blade (2) being mounted on the blade ring body (3) via a heat insulation ring (21), characterized in that: The centering tool comprises a measuring rod (5), a positioning adjustment device (6), and a length measuring instrument (7) mounted on the measuring rod (5); The positioning adjustment device (6) is configured in two groups and is respectively installed at two ends of the measuring rod (5), each group of the positioning adjustment device (6) further comprising at least two first rolling elements (61), and the length measuring instrument (7) is installed on the measuring rod (5); When the stationary blade sealing ring (1) is centered, its axial direction is vertical, the measuring rod (5) is placed horizontally above the stationary blade sealing ring (1), the rolling ends of a plurality of first rolling elements (61) in each group of positioning and adjusting devices (6) respectively abut against the upper end and the outer side wall of the stationary blade sealing ring (1), and the measuring end of the length measuring instrument (7) is directly opposite to or abuts against the inner side wall of the stationary blade sealing ring (1).

2. A full-circle stationary blade sealing ring centering tool according to claim 1, characterized in that: Each set of positioning and adjusting devices (6) is at least partially slidably connected to the measuring rod (5) in the axial direction of the measuring rod (5), and is provided with a set of first locking members (62) for locking the relative position of the positioning and adjusting devices (6) and the measuring rod (5).

3. A full-circle stationary blade sealing ring centering tool according to claim 2, characterized in that: The positioning adjustment device (6) further comprises an adjustment rod (63), one end of which is provided with a slide groove (631) extending along its axial direction, and one end of the measuring rod (5) corresponding to the positioning adjustment device (6) is slidably engaged with the slide groove (631).

4. A full-circle stationary blade sealing ring centering tool according to claim 3, characterized in that: The positioning adjustment device (6) further comprises at least one fixing frame (64) and a supporting frame (65) fixedly connected to the outer end of the adjustment rod (63); the fixing frame (64) and the supporting frame (65) are detachably connected and the relative torsion angle between the two is adjustable; and at least two first rolling elements (61) are mounted on the fixing frame (64).

5. A full-circle stationary blade sealing ring centering tool according to claim 4, characterized in that: The positioning adjustment device (6) further comprises at least one second set screw (66); the support frame (65) is provided with at least one first threaded hole (651); the fixing frame (64) is provided with a threaded rod portion (641) threadedly connected to the first threaded hole (651); the second set screw (66) passes through the support frame (65) and abuts against the fixing frame (64) to be locked, thereby achieving a stable connection between the support frame (65) and the fixing frame (64).

6. A full-circle stationary blade seal ring centering tool according to claim 5, characterized in that: The support frame (65) comprises a crossbar (652) and two vertical bars (653) respectively fixedly connected to two ends of the crossbar (652); the crossbar (652) is fixedly connected to the adjustment rod (63); and two first threaded holes (651) are provided and are respectively located at the ends of the two vertical bars (653); The fixing frames (64) are also configured in two groups and correspond one to one with the two vertical rods (653). The two fixing frames (64) are respectively locked in the first threaded holes (651) on the corresponding vertical rods (653) by two second fixing screws (66). Two first rolling members (61) are installed on each fixing frame (64).

7. A full-circle stationary blade sealing ring centering tool according to claim 3, characterized in that: The first locking member (62) comprises a first set screw (621), and the first set screw (621) passes through the corresponding adjustment rod (63) and abuts against the measuring rod (5) to be locked, so that the adjustment rod (63) is locked on the measuring rod (5).

8. The centering tool for a full-circle stationary blade seal ring according to claim 1, characterized in that: The length measuring instrument (7) is configured as a dial indicator, a micrometer, or a laser distance meter.

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