Tool for measuring sealing clearance of lower comb teeth of water turbine

Abstract

The utility model discloses a tool for measuring a sealing gap of a lower comb tooth of a water turbine, and relates to the technical field of mechanical measurement. The water turbine lower comb tooth sealing gap measuring tool comprises a measuring rod, two ends of the measuring rod are respectively a measuring end and an operating end, the measuring end is provided with a first measuring jaw and a second measuring jaw which are sequentially arranged along the direction from the measuring end to the operating end, and the measuring rod is provided with an adjusting mechanism for adjusting the distance between the first measuring jaw and the second measuring jaw. The tool for measuring the sealing clearance of the lower comb teeth of the water turbine is used for measuring the sealing clearance of the lower comb teeth of the water turbine under the condition that the measurement space is limited.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical measurement, and in particular to a tool for measuring the clearance of a lower comb seal of a water turbine. Background Art

[0002] A hydro-turbine generator refers to a hydro-turbine generator set that uses a turbine as the prime mover to convert water energy into electrical energy. When water flows through the turbine, the water energy is converted into mechanical energy. The turbine's rotating shaft drives the generator's rotor to rotate, converting mechanical energy into electrical energy for output. It is the main power equipment for producing electricity in a hydropower station.

[0003] During routine inspection and maintenance of hydro-turbine generators, it is necessary to measure the data between different structures to ensure that the gaps between different structures meet safety standards. Due to the limited position of the comb seal gap under the turbine and the small measurement space, conventional measuring tools such as rulers, tape measures, and vernier calipers cannot enter to measure it. Utility Model Content

[0004] The purpose of the present application is to provide a tool for measuring the gap between the lower comb teeth of a turbine, so as to solve the problem that the gap between the lower comb teeth of a turbine cannot be measured by conventional measuring tools due to the limited position of the gap between the lower comb teeth of a turbine.

[0005] The technical solution adopted by the present application to solve its technical problem is: a turbine lower comb seal gap measuring tool, including a measuring rod, the two ends of the measuring rod are a measuring end and an operating end respectively, the measuring end is provided with a first measuring jaw and a second measuring jaw arranged in sequence along the direction from the measuring end to the operating end, and the measuring rod is provided with an adjustment mechanism for adjusting the distance between the first measuring jaw and the second measuring jaw.

[0006] Furthermore, the measuring rod has an inner cavity extending along its axial direction, the first measuring jaw, the second measuring jaw and the adjustment mechanism are all arranged in the inner cavity of the measuring rod, and a first opening is provided on the outer wall of the measuring end, and the first measuring jaw and the second measuring jaw both pass through the first opening along the radial direction of the measuring rod and extend to the outside of the measuring rod.

[0007] Furthermore, a sliding box is provided in the inner cavity of the measuring rod, which moves along its axial direction and is connected to the second measuring claw, and the adjusting mechanism is used to drive the sliding box to move in the inner cavity of the measuring rod.

[0008] Furthermore, the adjustment mechanism includes a pull rod, a reference rod and a nut. The pull rod is arranged in the inner cavity of the measuring rod, and its two ends are respectively connected to the sliding box and the reference rod. A second opening is arranged on the outer wall of the operating end. The reference rod passes through the second opening along the radial direction of the measuring rod and extends to the outside of the measuring rod. The nut is threadedly connected to the reference rod and is used to abut against the outer wall of the measuring rod.

[0009] Furthermore, a first scale is provided on the outer wall of the measuring end.

[0010] Furthermore, a second scale is provided on the outer wall of the operating end.

[0011] Furthermore, the first measuring jaw is slidably connected to the measuring rod along the radial direction of the measuring rod, and a spring is provided between the first measuring jaw and the measuring rod to drive the first measuring jaw to extend to the outside of the measuring rod; a locking mechanism is provided between the sliding box and the first measuring jaw to lock the first measuring jaw retracted in the measuring rod; the second measuring jaw is slidably connected to the sliding box along the radial direction of the measuring rod, and a driving mechanism is provided on the sliding box to drive the second measuring jaw to extend and retract.

[0012] Furthermore, the locking mechanism includes a card block provided on the slide box and a card slot provided on the first measuring claw and engaged with the card block.

[0013] Furthermore, the driving mechanism includes a screw barrel, a worm wheel, a worm and an operating block; the screw barrel is rotatably installed in the sliding box and is threadedly connected to the second measuring claw, the worm wheel is coaxially arranged on the screw barrel, one end of the worm is rotatably connected to the sliding box and meshes with the worm wheel, and the other end of the worm is slidably connected to the operating block so that the worm can move axially along the measuring rod; the operating block is rotatably installed on the outside of the measuring rod.

[0014] Furthermore, a rotating cylinder connected to the operating block is provided in the measuring rod, a sliding cavity extending along the axial direction of the measuring rod and having a non-rotating structure is provided in the rotating cylinder, a sliding block is slidably fitted in the sliding cavity, and the sliding block is connected to the worm.

[0015] Beneficial effects of this application:

[0016] The turbine lower comb tooth seal gap measuring tool provided in the embodiment of the present application is used to measure the turbine lower comb tooth seal gap when the measuring space is limited; when measuring, the measuring end of the measuring rod is first inserted from the space below the turbine and reaches below the lower comb tooth seal gap, and then the first measuring claw and the second measuring claw are extended into the lower comb tooth seal gap through the measuring rod, and then the distance between the first measuring claw and the second measuring claw is adjusted through the adjustment mechanism so that the first measuring claw and the second measuring claw are respectively fitted with the two sides of the lower comb tooth seal gap, and then the measuring rod is taken out from the space below the turbine, and the distance between the first measuring claw and the second measuring claw is measured, so that the size of the turbine lower comb tooth seal gap can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a stereoscopic diagram of a turbine lower comb seal clearance measuring tool provided in an embodiment of the present application;

[0019] Figure 2 is a cross-sectional view of a turbine lower comb seal clearance measuring tool provided in an embodiment of the present application;

[0020] Figure 3 is a front view of a turbine lower comb seal clearance measuring tool provided in an embodiment of the present application;

[0021] Figure 4 It is a cross-sectional view of a turbine lower comb seal clearance measuring tool provided in an embodiment of the present application.

[0022] Reference numerals:

[0023] 10- measuring rod;

[0024] 101 - measuring end; 102 - operating end; 103 - first opening; 104 - second opening;

[0025] 11- first measuring claw;

[0026] 12- second measuring claw;

[0027] 13-Regulating mechanism;

[0028] 131-tie rod; 132-standard rod; 133-nut;

[0029] 14- Slide box;

[0030] 15- first scale;

[0031] 16-second scale;

[0032] 17- Spring;

[0033] 18-locking mechanism;

[0034] 181-card block; 182-card slot;

[0035] 19- driving mechanism;

[0036] 191-screw barrel; 192-worm wheel; 193-worm; 194-operating block; 195-rotating barrel; 196-sliding chamber; 197-sliding block; 198-screw;

[0037] 20-Guide rod. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0039] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0040] In the description of the embodiments of the present application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or is the orientation or positional relationship in which the product of the application is usually placed when in use, or is the orientation or positional relationship commonly understood by those skilled in the art. The terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, and an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements.

[0041] See also Figure 1 A turbine lower comb seal clearance measuring tool provided in an embodiment of the present application includes a measuring rod 10, wherein the two ends of the measuring rod 10 are a measuring end 101 and an operating end 102, and the measuring end 101 is provided with a first measuring jaw 11 and a second measuring jaw 12 arranged in sequence from the measuring end 101 to the operating end 102, and the measuring rod 10 is provided with an adjusting mechanism 13 for adjusting the distance between the first measuring jaw 11 and the second measuring jaw 12.

[0042] See also Figure 1 The hydraulic turbine lower comb teeth seal clearance measuring tool provided in the embodiment of the present application is used to measure the hydraulic turbine lower comb teeth seal clearance. The specific measurement process is as follows:

[0043] The measuring rod 10 is placed horizontally, and the first measuring jaw 11 and the second measuring jaw 12 are located at the top of the measuring rod 10; the operator holds the operating end 102 of the measuring rod 10, puts the measuring end 101 of the measuring rod 10 into the space below the turbine and moves it horizontally until the measuring end 101 reaches below the lower comb tooth sealing gap, and then controls the measuring rod 10 to extend the first measuring jaw 11 and the second measuring jaw 12 upward into the lower comb tooth sealing gap; then the distance between the first measuring jaw 11 and the second measuring jaw 12 is adjusted by the adjusting mechanism 13, so that the first measuring jaw 11 and the second measuring jaw 12 are separated from each other, until the first measuring jaw 11 and the second measuring jaw 12 are respectively attached to the two sides of the lower comb tooth sealing gap, at this time, the distance between the first measuring jaw 11 and the second measuring jaw 12 is locked by the adjusting mechanism 13, and the measuring rod 10 is taken out from the space below the turbine, and the distance between the first measuring jaw 11 and the second measuring jaw 12 is measured by a measuring tool such as a ruler, a tape measure, and a vernier caliper, so that the size of the lower comb tooth sealing gap of the turbine can be obtained.

[0044] Therefore, the turbine lower comb tooth seal gap measuring tool provided in the embodiment of the present application can measure the turbine lower comb tooth seal gap when the measuring space is limited, thereby solving the problem that conventional rulers, tape measures, vernier calipers and other measuring tools cannot enter to measure the gap due to limited measuring space.

[0045] See also Figure 1 The measuring rod 10 is a long strip structure, which can be a prism structure or a cylindrical structure. In this embodiment, the measuring rod 10 is a quadrangular prism structure.

[0046] In order to protect the adjustment mechanism 13, in some embodiments, see Figure 1 The measuring rod 10 has an inner cavity extending along its axial direction, and the first measuring jaw 11, the second measuring jaw 12 and the adjustment mechanism 13 are all arranged in the inner cavity of the measuring rod 10. A first opening 103 is provided on the outer wall of the measuring end 101. The first measuring jaw 11 and the second measuring jaw 12 both pass through the first opening 103 along the radial direction of the measuring rod 10 and extend to the outside of the measuring rod 10.

[0047] For example, see Figure 1 The measuring rod 10 includes four side plates and two end plates. The four side plates are connected end to end to form a hollow quadrangular prism structure. The two end plates are respectively fixed at the two ends of the quadrangular prism structure. A first opening 103 is provided at the right end of one of the side plates. The first measuring jaw 11 and the second measuring jaw 12 are arranged in the inner cavity of the measuring rod 10, and their ends extend from the first opening 103 to the outside of the measuring rod 10.

[0048] In some embodiments, see Figure 2 , Figure 4The inner cavity of the measuring rod 10 is provided with a slide box 14 that moves along its axial direction and is connected to the second measuring jaw 12. The adjustment mechanism 13 is used to drive the slide box 14 to move in the inner cavity of the measuring rod 10. During operation, the adjustment mechanism 13 drives the slide box 14 to move in the inner cavity of the measuring rod 10, and the slide box 14 drives the second measuring jaw 12 to move in the first opening 103, so that the second measuring jaw 12 is close to or away from the first measuring jaw 11, and the distance between the first measuring jaw 11 and the second measuring jaw 12 is adjusted.

[0049] The adjustment mechanism 13 can be an electric mechanism, for example, a motor and a screw mechanism are used to drive the slide box 14 to reciprocate in the inner cavity of the measuring rod 10 through the forward and reverse rotation of the motor. A switch for controlling the operation of the electric mechanism can be set at the operating end 102 of the measuring rod 10.

[0050] In some embodiments, see Figure 2 , Figure 4 The adjustment mechanism 13 includes a pull rod 131, a mark rod 132 and a nut 133. The pull rod 131 is arranged in the inner cavity of the measuring rod 10, and its two ends are respectively connected to the sliding box 14 and the mark rod 132. A second opening 104 is arranged on the outer wall of the operating end 102. The mark rod 132 passes through the second opening 104 along the radial direction of the measuring rod 10 and extends to the outside of the measuring rod 10. The nut 133 is threadedly connected to the mark rod 132 and is used to abut against the outer wall of the measuring rod 10.

[0051] The adjustment process of the adjustment mechanism 13 is as follows: Figure 4 When the first measuring claw 11 and the second measuring claw 12 extend into the sealing gap of the lower comb teeth, first loosen the nut 133 to separate the nut 133 from the outer wall of the measuring rod 10, and then the operator holds the mark rod 132 and moves the mark rod 132 to the left along the axis of the measuring rod 10 in the second opening 104. The mark rod 132 drives the slide box 14 to move to the left in the measuring rod 10 through the pull rod 131. When the first measuring claw 11 and the second measuring claw 12 are respectively fitted with both sides of the sealing gap of the lower comb teeth, tighten the nut 133 and make the nut 133 press against the outer wall of the measuring rod 10, thereby fixing the mark rod 132.

[0052] In some embodiments, see Figure 1 , Figure 3 The outer wall of the measuring end 101 is provided with a first scale 15, and the outer wall of the operating end 102 is provided with a second scale 16. By providing the first scale 15, the moving distance of the benchmark 132 can be quickly measured so as to indirectly obtain the distance between the first measuring jaw 11 and the second measuring jaw 12. By providing the second scale 16, the distance between the first measuring jaw 11 and the second measuring jaw 12 can be obtained without using a measuring tool such as a ruler, a tape measure, or a vernier caliper, and the operation is simpler.

[0053] In some embodiments, see Figure 2 , Figure 4 The first measuring jaw 11 is slidably connected to the measuring rod 10 along the radial direction of the measuring rod 10, and a spring 17 is provided between the first measuring jaw 11 and the measuring rod 10 to drive the first measuring jaw 11 to extend to the outside of the measuring rod 10; a locking mechanism 18 is provided between the sliding box 14 and the first measuring jaw 11 to lock the first measuring jaw 11 retracted in the measuring rod 10; the second measuring jaw 12 is slidably connected to the sliding box 14 along the radial direction of the measuring rod 10, and a driving mechanism 19 is provided on the sliding box 14 to drive the second measuring jaw 12 to retract and extend.

[0054] For example, see Figure 2 , Figure 4 The right end of the measuring rod 10 is fixed with a guide rod 20 extending in the radial direction thereof, and the first measuring claw 11 is provided with a guide groove matched with the guide rod 20. The guide rod 20 is arranged in the guide groove of the first measuring claw 11, so that the first measuring claw 11 moves in the radial direction of the measuring rod 10 under the action of the guide rod 20 and the guide groove, and then the first measuring claw 11 is retracted in the inner cavity of the measuring rod 10 or extends to the outside of the measuring rod 10 along the radial direction of the measuring rod 10. The spring 17 is a compression spring, which is arranged in the guide groove, and its two ends are respectively connected to the guide rod 20 and the first measuring claw 11; in the absence of external force, the end of the first measuring claw 11 can be even outside the measuring rod 10 by the reset force of the spring 17. The locking mechanism 18 is arranged between the sliding box 14 and the first measuring claw 11, and the first measuring claw 11 retracted in the measuring rod 10 can be locked by the locking mechanism 18 to prevent the first measuring claw 11 from extending to the outside of the measuring rod 10. The second measuring jaw 12 is slidably connected to the slide box 14 so that the second measuring jaw 12 can slide along the radial direction of the measuring rod 10. The driving mechanism 19 is arranged on the slide box 14 and is used to drive the second measuring jaw 12 to move along the measuring rod 10 so that the second measuring jaw 12 is retracted in the inner cavity of the measuring rod 10 or extends to the outside of the measuring rod 10.

[0055] By setting the above structure, the first measuring jaw 11 and the second measuring jaw 12 can be retracted in the inner cavity of the measuring rod 10 when the measuring tool is in a non-measuring state to reduce the overall size of the measuring tool. When the measuring tool is in a measuring state, the first measuring jaw 11 and the second measuring jaw 12 can be extended from the inner cavity of the measuring rod 10 to measure the sealing gap of the lower comb teeth.

[0056] In some embodiments, see Figure 2 , Figure 4 The locking mechanism 18 includes a block 181 disposed on the slide box 14 and a slot 182 disposed on the first measuring claw 11 and engaged with the block 181 .

[0057] For example, see Figure 4A card block 181 is provided on the right side of the slide box 14, and a card slot 182 is provided on the left side of the first measuring claw 11. When the first measuring claw 11 is moved downward and retracted in the inner cavity of the measuring rod 10, the card slot 182 just corresponds to the card block 181, and then the slide box 14 is controlled to move rightward to insert the card block 181 into the card slot 182, so as to lock the first measuring claw 11, and then the second measuring claw 12 can be retracted in the inner cavity of the measuring rod 10 through the driving mechanism 19, as shown in FIG. Figure 2 shown.

[0058] In some embodiments, see Figure 2 , Figure 4 The drive mechanism 19 includes a screw barrel 191, a worm wheel 192, a worm 193 and an operating block 194; the screw barrel 191 is rotatably mounted in the slide box 14 and is threadedly connected to the second measuring jaw 12, the worm wheel 192 is coaxially arranged on the screw barrel 191, one end of the worm 193 is rotatably connected to the slide box 14 and meshes with the worm wheel 192, and the other end of the worm 193 is slidably connected to the operating block 194, so that the worm 193 can move along the axial direction of the measuring rod 10; the operating block 194 is rotatably mounted on the outside of the measuring rod 10. A rotating barrel 195 connected to the operating block 194 is arranged in the measuring rod 10, and a sliding cavity 196 extending along the axial direction of the measuring rod 10 and having a non-rotating structure is arranged in the rotating barrel 195, and a sliding block 197 is slidably matched in the sliding cavity 196, and the sliding block 197 is connected to the worm 193.

[0059] For example, see Figure 2 , Figure 4 The screw barrel 191 is vertically arranged and rotatably mounted in the slide box 14. A screw rod 198 extending downward is fixed at the lower end of the second measuring jaw 12. The screw rod 198 is threadedly connected in the screw barrel 191. The worm wheel 192 is coaxially arranged and fixedly connected with the screw barrel 191. The worm 193 is arranged in the inner cavity of the measuring rod 10 along the axial direction of the measuring rod 10. The right end of the worm 193 is rotatably connected to the slide box 14 through a bearing structure and meshes with the worm wheel 192. The operating block 194 is rotatably mounted on the measuring rod 10. On the end plate at the left end, a rotating cylinder 195 is arranged in the inner cavity of the measuring rod 10 and is connected to the operating block 194. The right end of the rotating cylinder 195 has a sliding cavity 196 extending along the axial direction of the measuring rod 10. The sliding cavity 196 is a non-rotating structure. The left end of the worm 193 is connected to a slider 197, which is slidably fitted in the sliding cavity 196 so that the slider 197 can move in the sliding cavity 196 along the axial direction of the measuring rod 10, while preventing the slider 197 from rotating relative to the rotating cylinder 195.

[0060] The working principle of the driving mechanism 19 is as follows: Figure 2When the measuring end 101 reaches below the sealing gap of the lower comb teeth, the operator holds the operating block 194 and rotates it, the operating block 194 drives the rotating cylinder 195 to rotate, the rotating cylinder 195 drives the slider 197 to rotate, the slider 197 drives the worm 193 to rotate, the worm 193 drives the worm wheel 192 to rotate, the worm wheel 192 drives the screw barrel 191 to rotate, the screw barrel 191 drives the screw 198 to move upward, the screw 198 drives the second measuring claw 12 to move upward, when the upper end of the second measuring claw 12 extends upward into the sealing gap of the lower comb teeth, stop rotating the operating block 194; loosen the nut 133, the operator holds The reference rod 132 moves to the left, the reference rod 132 drives the pull rod 131 to move to the left, the pull rod 131 drives the slide box 14 to move to the left, when the block 181 is disengaged from the card slot 182, the spring 17 pushes the first measuring claw 11 upward, so that the upper end of the first measuring claw 11 extends upward to the lower comb tooth sealing gap; the measuring rod 10 is pushed to make the first measuring claw 11 fit with the right side of the lower comb tooth sealing gap, and the reference rod 132 is continuously pulled to the left, so that the second measuring claw 12 fits with the left side of the lower comb tooth sealing gap, and then the nut 133 is tightened to fix the reference rod 132, and then the measuring rod 10 is taken out from the space below the turbine, as shown in FIG. Figure 4 As shown, by measuring the distance between the first measuring jaw 11 and the second measuring jaw 12, the size of the comb seal gap under the turbine can be obtained.

[0061] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Based on the technical essence of the present application and within the spirit and principles of the present application, any simple modification, equivalent replacement and improvement of the above embodiments shall still fall within the protection scope of the technical solution of the present application.

Claims

1. A turbine lower comb seal clearance measuring tool, characterized in that: The invention comprises a measuring rod (10), wherein two ends of the measuring rod (10) are respectively a measuring end (101) and an operating end (102); the measuring end (101) is provided with a first measuring jaw (11) and a second measuring jaw (12) arranged in sequence along a direction from the measuring end (101) to the operating end (102); and the measuring rod (10) is provided with an adjusting mechanism (13) for adjusting the distance between the first measuring jaw (11) and the second measuring jaw (12).

2. The turbine lower comb seal clearance measuring tool according to claim 1, characterized in that: The measuring rod (10) has an inner cavity extending along its axial direction, the first measuring jaw (11), the second measuring jaw (12) and the adjusting mechanism (13) are all arranged in the inner cavity of the measuring rod (10), a first opening (103) is arranged on the outer wall of the measuring end (101), the first measuring jaw (11) and the second measuring jaw (12) pass through the first opening (103) along the radial direction of the measuring rod (10) and extend to the outside of the measuring rod (10).

3. The turbine lower comb seal clearance measuring tool according to claim 2, characterized in that: A slide box (14) is provided in the inner cavity of the measuring rod (10) and moves along its axial direction and is connected to the second measuring claw (12). The adjustment mechanism (13) is used to drive the slide box (14) to move in the inner cavity of the measuring rod (10).

4. The turbine lower comb seal clearance measuring tool according to claim 3, characterized in that: The adjustment mechanism (13) comprises a pull rod (131), a mark rod (132) and a nut (133); the pull rod (131) is arranged in the inner cavity of the measuring rod (10), and its two ends are respectively connected to the sliding box (14) and the mark rod (132); a second opening (104) is arranged on the outer wall of the operating end (102); the mark rod (132) passes through the second opening (104) along the radial direction of the measuring rod (10) and extends to the outside of the measuring rod (10); the nut (133) is threadedly connected to the mark rod (132) and is used to abut against the outer wall of the measuring rod (10).

5. The turbine lower comb seal clearance measuring tool according to claim 1, characterized in that: A first scale (15) is provided on the outer wall of the measuring end (101).

6. The turbine lower comb seal clearance measuring tool according to claim 4, characterized in that: A second scale (16) is provided on the outer wall of the operating end (102).

7. The turbine lower comb seal clearance measuring tool according to claim 4, characterized in that: The first measuring claw (11) is slidably connected to the measuring rod (10) along the radial direction of the measuring rod (10), and a spring (17) is provided between the first measuring claw (11) and the measuring rod (10) for driving the first measuring claw (11) to extend to the outside of the measuring rod (10); A locking mechanism (18) is provided between the slide box (14) and the first measuring claw (11) for locking the first measuring claw (11) retracted in the measuring rod (10); The second measuring claw (12) is slidably connected to the slide box (14) along the radial direction of the measuring rod (10), and the slide box (14) is provided with a driving mechanism (19) for driving the second measuring claw (12) to extend and retract.

8. The turbine lower comb seal clearance measuring tool according to claim 7, characterized in that: The locking mechanism (18) comprises a clamping block (181) arranged on the sliding box (14) and a clamping groove (182) arranged on the first measuring claw (11) and engaged with the clamping block (181).

9. The turbine lower comb seal clearance measuring tool according to claim 7, characterized in that: The driving mechanism (19) comprises a screw barrel (191), a worm wheel (192), a worm (193) and an operating block (194); the screw barrel (191) is rotatably mounted in the slide box (14) and is threadedly connected to the second measuring claw (12); the worm wheel (192) is coaxially arranged on the screw barrel (191); one end of the worm (193) is rotatably connected to the slide box (14) and meshes with the worm wheel (192); the other end of the worm (193) is slidably connected to the operating block (194) so ​​that the worm (193) can move along the axial direction of the measuring rod (10); the operating block (194) is rotatably mounted outside the measuring rod (10).

10. The turbine lower comb seal clearance measuring tool according to claim 9, characterized in that: The measuring rod (10) is provided with a rotating cylinder (195) connected to the operating block (194); the rotating cylinder (195) is provided with a sliding cavity (196) extending along the axial direction of the measuring rod (10) and having a non-rotating structure; a sliding block (197) is slidably fitted in the sliding cavity (196); and the sliding block (197) is connected to the worm (193).

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