A tooling and operating method for checking the clearance of moving guide vanes of a water turbine.

Abstract

This invention discloses a fixture and operating method for inspecting the clearance of movable guide vanes in a water turbine, including a ring rail and a detection fixture. Multiple locking components are provided on the ring rail. The detection fixture includes a movable frame and an end-face clearance detection component and a vertical clearance detection component mounted on the movable frame. The movable frame is movably mounted on the ring rail and can move and position itself in a ring along the ring rail. The end-face clearance detection component includes a first drive lifting structure, a connecting arm, and an end-face clearance detection end. The first drive lifting structure is mounted on the movable frame. One end of the connecting arm is connected to the first drive lifting structure, and the other end is connected to the end-face clearance detection end. The connecting arm is vertically adjustable via the first drive lifting structure. The end-face clearance detection end includes a first distance sensor. The vertical clearance detection component includes a second distance sensor and a third distance sensor. This invention achieves the detection of end-face and vertical clearances of movable guide vanes in a water turbine through modular design.

Description

Technical Field

[0001] This invention relates to the field of water turbine maintenance technology, and in particular to a tooling and operating method for checking the clearance of moving guide vanes of a water turbine. Background Technology

[0002] The clearance of the moving guide vanes in a hydro turbine is a key parameter affecting the unit's efficiency, operational stability, and sealing performance. Excessive clearance can lead to water leakage, guide vane cavitation, and unit vibration, while insufficient clearance may cause guide vane jamming or structural wear. Therefore, accurate measurement and adjustment are crucial aspects of turbine installation and maintenance. Currently, guide vane clearance measurement relies heavily on manual labor using tools such as feeler gauges and dial indicators. This requires draining the water from the volute after the unit is shut down and manually entering the confined space to measure the clearance values ​​between each guide vane and the top cover, bottom ring, and adjacent guide vanes.

[0003] However, manual measurement relies on the operator's experience and judgment. The insertion force, angle, and reading error of the feeler gauge directly affect the accuracy of the results. Especially in complex structures such as guide vane curved surfaces and journals, it is difficult to achieve multi-point uniform sampling. In addition, the manual measurement operation process is cumbersome and time-consuming. It is necessary to tie the guide vane with steel wire rope to fix its posture. The measurement of a single 24-blade guide vane unit requires 2-3 people to work together for more than 8 hours. Moreover, the adjustment requires repeated disassembly and re-measurement. In addition, the uneven force distribution caused by the guide vane closing further extends the maintenance cycle.

[0004] Therefore, a tooling and operating method for checking the clearance of the moving guide vanes of a water turbine is needed to improve the above-mentioned problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings in the prior art, the present invention provides a tooling and operating method for checking the clearance of the moving guide vanes of a water turbine, so as to solve the problem of inconvenience in measuring the clearance of the guide vanes.

[0006] To achieve the above objectives, this application provides a tooling for checking the clearance of movable guide vanes of a water turbine, including a ring rail and a testing tooling;

[0007] Multiple locking components are installed on the ring rail, which are used to connect with the top cover or bottom ring of the turbine; The inspection fixture includes a movable frame and end face gap detection components and facade gap detection components mounted on the movable frame. The movable frame is movably mounted on a ring rail and can move and be positioned in a ring along the ring rail. The end face gap detection components include a first drive lifting structure, a connecting arm, and an end face gap detection end. The first drive lifting structure is mounted on the movable frame. One end of the connecting arm is connected to the first drive lifting structure, and the other end is connected to the end face gap detection end. The connecting arm is vertically adjustable via the first drive lifting structure. The end face gap detection end includes a first distance sensor. The facade gap detection components include a second distance sensor and a third distance sensor.

[0008] The first drive lifting structure includes a conveying frame, which is fixed on a movable frame. A slide groove is provided on the front end face of the conveying frame, and a slider is installed in the slide groove. A first servo motor is installed at the upper end of the slide groove. The output end of the first servo motor is connected to a lead screw, which is screwed to the slider. A connecting arm is connected to the slider.

[0009] The slider is connected to one or two hinge ends. A hinge groove is provided in the middle of the hinge end. A hinge part is hinged in the hinge groove. A connecting arm is fixedly connected to the side of the hinge part.

[0010] The upper and / or lower sides of the hinge are provided with friction rings, which abut against the hinge end.

[0011] The end face gap detection end also includes a mounting base fixedly connected to the connecting arm. A second servo motor is mounted on the mounting base. A first distance sensor and a first angle sensor are mounted on the output end of the second servo motor. The first angle sensor and the first distance sensor are fixedly connected.

[0012] The second and third ranging sensors are respectively mounted on two mounting plates, and the two mounting plates are respectively mounted on two third servo motors. Both third servo motors are mounted on a moving frame. The lower end of the mounting plate is fixedly connected to a limit ring, which is rotatably connected to the moving frame.

[0013] The facade gap detection assembly also includes a cable tray with a connecting rod fixed to the bottom of the cable tray. The connecting rod is connected to the movable end of a servo lifting mechanism. The servo lifting mechanism is installed on a movable frame. The connecting rod is vertically positioned and is driven to move vertically up and down by the servo lifting mechanism. The second and third distance sensors are installed on the cable tray.

[0014] The second and third ranging sensors are respectively mounted on two mounting plates, and the two mounting plates are respectively mounted on two third servo motors. Both third servo motors are mounted on the bridge frame. The lower end of the mounting plate is fixedly connected to a limit ring, which is rotatably connected to the bridge frame.

[0015] The mobile frame is equipped with a power supply module, a controller, and a display screen; the power supply module is electrically connected to the controller, and the controller is electrically connected to the electrical components in the end face gap detection component and the facade gap detection component.

[0016] The movable frame includes an upper plate, the lower surface of which is connected to the lower plate by connecting columns around its perimeter. The bottom of the lower plate is provided with a bottom groove. A track protrusion is fixed on the outer side of the upper end of the ring rail, extending into the bottom groove. The track protrusion slides and guides the bottom groove. A locking element is installed on the inner side of the upper end of the ring rail.

[0017] The ring track is composed of multiple arc-shaped track components spliced ​​together.

[0018] The locking component includes a receiving sleeve, the inner hole of which is threadedly connected to an adjusting screw. The inner hole of the receiving sleeve passes through the ring rail. A strong magnet is fixedly or rotatably connected to the lower end of the adjusting screw inside the receiving sleeve. The strong magnet is magnetically connected to the top cover or bottom ring of the turbine for positioning.

[0019] A method for inspecting the clearance of movable guide vanes in a water turbine, using a tooling for inspecting the clearance of movable guide vanes in a water turbine as described above, includes the following steps: S1. Initially position the ring rail on the top cover or bottom ring of the turbine using some locking parts, adjust the position of the ring rail so that the center of the ring rail coincides with the center of the turbine main shaft, and then fix the ring rail using all locking parts. S2. Place the testing fixture on the ring rail, move the testing fixture to the testing position of the corresponding guide vane; S3. The first drive lifting structure adjusts the height of the end face gap detection end, positioning the first ranging sensor at the same height as the end face of the guide vane to be detected. The first ranging sensor emits a laser to detect the initial detection point and obtain D. m According to the formula The vertical displacement is obtained, and then the current spacing is calculated based on the initial end face gap. S4. Adjust the end face clearance of the guide vane to a suitable clearance distance based on the end face clearance value obtained in S3. S5. The second and third distance sensors are perpendicular to the guide vane surface of the gap to be detected. The second distance sensor measures the sealing surface of guide vane A and outputs the distance value. The third ranging sensor measures the sealing surface of guide vane B and outputs the distance value. ; According to the formula Calculate the facade gap G; in, This is the theoretical thickness of the guide vane sealing surface; S6. Adjust the guide vane clearance based on the data obtained from S5. S7. Move the inspection fixture in a circular motion to inspect the gaps of the remaining guide vanes.

[0020] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. The ring rail of the present invention is used to be installed on the top cover or bottom ring of the water turbine as needed by locking components. The inspection fixture is slidably installed on the ring rail. The inspection fixture achieves non-contact measurement through a distance measuring sensor to detect the end face gap and vertical gap of the moving guide vane of the water turbine.

[0021] 2. This invention significantly improves detection efficiency through synchronous detection design and automated adjustment structure. The end face and vertical face gap detection component can collect data on adjacent guide vanes synchronously. Combined with the automated drive for lifting and angle adjustment, it reduces the tedious process of repeated manual adjustments and single-point measurements, and greatly shortens the unit maintenance cycle.

[0022] 3. The ring rail of the present invention achieves rapid fixation without drilling through magnetic locking components, making installation and disassembly convenient. The overall structure of the testing fixture is lightweight, supports smooth manual movement along the track, and requires no complex power device, thus reducing dependence on on-site operating conditions.

[0023] 4. The comprehensive detection range and precise data analysis support of this invention ensure the stability of unit operation and optimize maintenance quality. The circumferential track design ensures that all guide vanes are inspected without omission. The detection data provides a quantitative basis for adjusting the guide vane clearance, avoiding structural wear or jamming problems caused by blind adjustment, which helps to extend the service life of the equipment and improve the operating efficiency of the unit. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a first-view perspective perspective view of the entire invention; Figure 2 This is a three-dimensional structural diagram of the detection fixture in this invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional schematic diagram of the detection fixture in this invention; Figure 5 This is a cross-sectional schematic diagram of the facade gap detection component in this invention; Figure 6 This is a second-view perspective perspective view of the entire invention; Figure 7 This is a third-person perspective view of the entire invention; Figure 8 This is a flowchart of the detection method of the present invention; Figure 9 This is a schematic diagram illustrating the measurement of the guide vane end face clearance using a first ranging sensor according to the present invention. Figure 10 This is a schematic diagram illustrating the measurement of the gap between adjacent guide vane surfaces using second and third ranging sensors according to the present invention.

[0026] Figure label: 1. Ring rail, 11. Arc-shaped rail component, 12. Receiving sleeve, 13. Adjusting screw, 14. Rail protrusion, 15. Rail groove; Inspection fixture 2, upper plate 21, lower plate 22, power supply module 23, connecting column 24, bottom groove 25, handle 26; display screen 27; end face gap detection assembly 28, conveying frame 281, slider 282, hinge end 283, hinge part 284, hinge groove 285, connecting arm 286; end face gap detection end 287, mounting base 2871, mounting groove 2872, first angle sensor 2873, second servo motor 2874, first distance sensor 2875; first servo motor 288, lead screw 289, friction ring 2810; servo lifting mechanism 29, limit component 210, bracket 211, roller 212, connecting rod 213; vertical gap detection assembly 214, bridge 2141, third servo motor 2142, mounting plate 2143, limit ring 2144, second distance sensor 2145, third distance sensor 2146. Detailed Implementation

[0027] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0028] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Example 1: See Figures 1-7 The present invention provides a tooling for checking the clearance of the movable guide vanes of a water turbine, including a ring rail 1 and a detection tooling 2; Multiple locking components are provided on the ring rail 1, which are used to connect with the top cover or bottom ring of the water turbine; The inspection fixture 2 includes a movable frame and an end face gap detection component 28 and a vertical gap detection component 214 mounted on the movable frame. The movable frame is movably mounted on the ring rail 1 and can move and be positioned in a ring along the ring rail 1. The end face gap detection component 28 includes a first drive lifting structure, a connecting arm 286, and an end face gap detection end 287. The first drive lifting structure is mounted on the movable frame. One end of the connecting arm 286 is connected to the first drive lifting structure, and the other end is connected to the end face gap detection end 287. The connecting arm 286 is vertically adjustable by the first drive lifting structure. The end face gap detection end 287 includes a first distance sensor 2875. The vertical gap detection component 214 includes a second distance sensor 2145 and a third distance sensor 2146.

[0031] The ring rail 1 is used to install onto the top cover or bottom ring of the turbine as needed, using locking devices such as bolts or strong magnets. The inspection fixture 2 is slidably mounted on the ring rail 1, and can move around the ring rail 1 with some damping to adjust its inspection position. The first drive lifting structure is used to adjust the vertical height position of the first ranging sensor 2875. This inspection fixture, through its modular design, enables the detection of the end face clearance and vertical clearance of the turbine's moving guide vanes.

[0032] In this embodiment, the first ranging sensor 2875, the second ranging sensor 2145, and the third ranging sensor 2146 can all be laser ranging sensors or infrared ranging sensors.

[0033] To facilitate the installation of the ring rail 1, the ring rail 1 is assembled from multiple arc-shaped track components 11. The ends of adjacent arc-shaped track components 11 are respectively provided with engaging and aligning protrusions and grooves, which facilitates the assembly of multiple arc-shaped track components 11 to form a circular ring rail 1.

[0034] In this embodiment, see Figure 2 , 7 The movable frame includes an upper plate 21, with handles 26 fixedly connected to both sides of the upper surface of the upper plate 21 for easy handling. The lower surface of the upper plate 21 is connected to the lower plate 22 around the perimeter by connecting columns 24. The bottom of the lower plate 22 is provided with a bottom groove 25. A track protrusion 14 is fixedly provided on the outer side of the upper end of the ring rail 1. The track protrusion 14 extends into the bottom groove 25 and slides with the bottom groove 25 for guidance. A locking element is installed on the inner side of the upper end of the ring rail 1.

[0035] Further, see Figure 4The upper end face of the track protrusion 14 is provided with a track groove 15. A roller 212 is installed in the bottom groove 25 through a bracket 211. The roller 212 is located in the track groove 15. The roller 212 is made of polyurethane and provides a certain support force. The lower plate 22 is always in contact with the ring rail 1, so that the inspection fixture 2 can move under a certain thrust.

[0036] See Figure 7 The locking component includes a receiving sleeve 12, with an adjusting screw 13 threadedly connected to its inner hole. The inner hole of the receiving sleeve 12 passes through the ring rail 1. A strong magnet is fixedly or rotatably connected to the lower end of the adjusting screw 13 within the receiving sleeve 12. The strong magnet is magnetically attracted to the turbine top cover or bottom ring for positioning. When the adjusting screw 13 rotates downward, the strong magnet contacts the top cover or bottom ring. When it is necessary to remove the ring rail 1, the adjusting screw 13 is rotated upward to separate the strong magnet from the top cover or bottom ring.

[0037] To prevent the moving frame from sliding during testing, a limiting component 210 is installed on the lower plate 22 of the moving frame. The limiting component 210 and the locking component have the same structure. In use, when the adjusting screw 13 is rotated downward, the strong magnet contacts the ring rail 1. When the moving frame needs to move, the adjusting screw 13 is rotated upward to separate the strong magnet from the ring rail 1.

[0038] In this embodiment, see Figure 2 , 4 The first driving lifting structure includes a conveyor frame 281, which is fixed on a movable frame. A groove is formed on the front end of the conveyor frame 281, and a slider 282 is installed inside the groove. A first servo motor 288 is installed at the upper end of the groove, and a lead screw 289 is connected to the output end of the first servo motor 288. The lead screw 289 is screwed onto the slider 282. A connecting arm 286 is connected to the slider 282. Rotation of the output shaft of the first servo motor 288 drives the lead screw 289 to rotate. Since the slider 282 can only slide and cannot rotate within the groove, driving the slider 282 to slide up and down within it causes the connecting arm 286 to move vertically up and down to adjust the height, thereby adjusting the height position of the first ranging sensor 2875, thus moving the first ranging sensor 2875 to a specified height position.

[0039] Example 2: See Figure 2 The slider 282 is connected to one or two hinge ends 283. A hinge groove 285 is provided in the middle of the hinge end 283. A hinge part 284 is hinged in the hinge groove 285. A connecting arm 286 is fixedly connected to the side of the hinge part 284. With the above structure, the connecting arm 286 can swing laterally to adjust the angle as needed.

[0040] exist Figure 2The diagram shows a structure with two hinged ends 283 connected to the slider 282, with a 120° included angle between the two hinged ends 283. This allows for the installation of two connecting arms 286 via the two hinged ends 283, and subsequently, two first ranging sensors 2875, enabling simultaneous measurement of the end face gap between two adjacent guide vanes.

[0041] Furthermore, a friction ring 2810 is provided on the upper and / or lower sides of the hinge portion 284, and the friction ring 2810 abuts against the hinge end 283. This provides a certain degree of damping when the connecting arm 286 swings laterally, allowing it to stop after being adjusted to a suitable position, and preventing it from swinging arbitrarily left or right in the event of vibration. In this embodiment, the friction ring 2810 can be a nylon pad or a rubber pad.

[0042] In use, the hinge part 284 rotates within the hinge groove 285 and abuts against the hinge end 283 through the friction ring 2810 on the upper and lower end faces, thereby fixing the angle of the connecting arm 286, ensuring the stability of the angle and position during the detection process, and improving data reliability. The first ranging sensor 2875 at the ends of the connecting arms 286 on both sides can be aligned with the two adjacent guide vanes respectively, and data is collected synchronously through the first ranging sensor 2875 to improve detection efficiency.

[0043] Example 3: Based on Example 1 or Example 2, see Figure 3 The end face gap detection end 287 also includes a mounting base 2871 fixedly connected to the connecting arm 286. A second servo motor 2874 is mounted on the mounting base 2871. A first angle sensor 2873 and a first distance sensor 2875 are mounted on the output end of the second servo motor 2874. The first angle sensor 2873 and the first distance sensor 2875 are fixedly connected.

[0044] Specifically, the front end of the mounting base 2871 is provided with a mounting groove 2872, and a second servo motor 2874 is installed on the side of the mounting groove 2872. The output end of the second servo motor 2874 extends through the mounting base 2871 into the mounting groove 2872 and is equipped with a first angle sensor 2873 and a first distance sensor 2875.

[0045] During testing, please refer to Figure 9 The second servo motor 2874 drives the first angle sensor 2873 and the first distance sensor 2875 to rotate. The first angle sensor 2873 records the real-time angle θ, and the first distance sensor 2875 measures the distance from the sensor to the guide vane surface. According to geometric relationships, the displacement perpendicular to the guide vane end face Based on the initial end-face gap reference value, the actual end-face gap is calculated.

[0046] Example 4: Based on Embodiment 1, 2, or 3, the second ranging sensor 2145 and the third ranging sensor 2146 in this embodiment are mounted on a mobile frame. For example, the second ranging sensor 2145 and the third ranging sensor 2146 can be mounted on the upper plate 21 of the mobile frame.

[0047] Specifically, see Figure 5 The second ranging sensor 2145 and the third ranging sensor 2146 are respectively mounted on two mounting plates 2143. The two mounting plates 2143 are respectively mounted on two third servo motors 2142. Both third servo motors 2142 are mounted on a moving frame. A limit ring 2144 is fixedly connected to the lower end of each mounting plate 2143, and the limit ring 2144 is rotatably connected to the moving frame. The two third servo motors 2142 allow for adjustment of the left and right angles of the second ranging sensor 2145 and the third ranging sensor 2146 on the horizontal plane, enabling adjustment of the measurement position as needed.

[0048] During testing, the second ranging sensor 2145 and the third ranging sensor 2146 are driven to rotate by the third servo motor 2142, respectively. The limiting ring 2144 and the upper plate 21 of the moving frame provide rotation limiting support to ensure the stable rotation of the second ranging sensor 2145 and the third ranging sensor 2146.

[0049] In implementation, the third servo motor 2142 is mounted on the lower side of the upper plate 21, with its output shaft extending upwards from the upper plate 21. The mounting plate 2143 is mounted on the output shaft of the third servo motor 2142. A sliding groove adapted to the limiting ring 2144 is provided on the upper side of the upper plate 21 with the output shaft of the third servo motor 2142 as the center, and the limiting ring 2144 extends into the sliding groove.

[0050] Example 5: Based on embodiment 1, 2 or 3, the second ranging sensor 2145 and the third ranging sensor 2146 in this embodiment are mounted on the cable tray 2141.

[0051] Specifically, see Figure 2 , 4 5. The facade gap detection component 214 also includes a cable tray 2141. A connecting rod 213 is fixedly connected to the bottom of the cable tray 2141, and the connecting rod 213 is connected to the movable end of the servo lifting mechanism 29. The servo lifting mechanism 29 is mounted on the movable frame, and the connecting rod 213 is vertically arranged. The connecting rod 213 is driven to move vertically up and down by the servo lifting mechanism 29. The second ranging sensor 2145 and the third ranging sensor 2146 are mounted on the cable tray 2141.

[0052] The servo lifting mechanism 29 can adopt a servo lifting slide mechanism in the prior art, or it can adopt the same structure as the first drive lifting structure in this application. When adopting the same structure as the first drive lifting structure in this application, the lower end of the connecting rod 213 is mounted and fixed on the slider 282, such as... Figure 6 As shown.

[0053] During testing, the height of the bridge 2141 is adjusted by the servo lifting mechanism 29, thereby adjusting the height of the second ranging sensor 2145 and the third ranging sensor 2146 to meet the measurement requirements.

[0054] Further, see Figure 5 The second ranging sensor 2145 and the third ranging sensor 2146 are respectively mounted on two mounting plates 2143. The two mounting plates 2143 are respectively mounted on two third servo motors 2142. Both third servo motors 2142 are mounted on a cable tray 2141. A limit ring 2144 is fixedly connected to the lower end of each mounting plate 2143, and the limit ring 2144 is rotatably connected to the cable tray 2141. The two third servo motors 2142 allow for adjustment of the left and right angles of the second ranging sensor 2145 and the third ranging sensor 2146 on the horizontal plane, enabling adjustment of the measurement position as needed.

[0055] When inspecting facade gaps, refer to Figure 10 The second ranging sensor 2145 measures the distance to the sealing surface of guide vane A. The third ranging sensor 2146 measures the distance to the sealing surface of guide vane B. According to the formula Calculate the facade gap G; in the figure, L Indicates the center-to-center distance between the two sensors; This is the theoretical thickness of the guide vane sealing surface.

[0056] Example 6: Based on Example 1, 2, 3, 4, or 5, see [link to example]. Figure 1 The mobile frame is equipped with a power supply module 23, a controller 2147 and a display screen 27; the power supply module 23 is electrically connected to the controller 2147, and the controller 2147 is electrically connected to the electrical components in the end face gap detection component 28 and the vertical face gap detection component 214.

[0057] In one embodiment, the controller 2147 is electrically connected to the first servo motor 288, the second servo motor 2874, the third servo motor 2142, the first ranging sensor 2875, the second ranging sensor 2145, the third ranging sensor 2146, and the first angle sensor 2873. Through the algorithm within the controller 2147, relevant data can be obtained quickly.

[0058] Example 7: This embodiment provides a method for inspecting the clearance of movable guide vanes in a hydraulic turbine, applicable to a tooling for inspecting the clearance of movable guide vanes in a hydraulic turbine as described in the above embodiment. (See also...) Figure 8 The gap inspection method includes the following steps: S1. Initially position the ring rail 1 on the top cover or bottom ring of the turbine using some locking parts, adjust the position of the ring rail 1 so that the center of the ring rail 1 coincides with the center of the turbine main shaft, and then fix the ring rail 1 using all locking parts. S2. Install the inspection fixture 2 on the ring rail 1, move the inspection fixture 2 to the inspection position of the corresponding guide vane; S3. The first drive lifting structure drives the end face gap detection end 287 to adjust its height, so that the first ranging sensor 2875 is at the same height as the end face of the guide vane to be detected. The first ranging sensor 2875 emits a laser to detect the initial detection point and obtain D. m According to the formula The vertical displacement is obtained, and then the current spacing is calculated based on the initial end face gap. S4. Adjust the end face clearance of the guide vane to a suitable clearance distance based on the end face clearance value obtained in S3. S5, the second ranging sensor 2145 and the third ranging sensor 2146 are perpendicular to the guide vane surface of the gap to be detected. The second ranging sensor 2145 measures the sealing surface of guide vane A and outputs the distance value. The third ranging sensor 2146 measures the sealing surface of guide vane B and outputs the distance value. ; According to the formula Calculate the facade gap G; in, This is the theoretical thickness of the guide vane sealing surface; S6. Adjust the guide vane clearance based on the data obtained from S5. S7. Move the inspection fixture 2 in a circular motion to inspect the gaps of the remaining guide vanes.

[0059] Specifically, see Figure 1 First, several arc-shaped track components 11 are spliced ​​into a circular ring track 1. During the assembly process, the testing fixture 2 is installed on the arc-shaped track components 11. Multiple arc-shaped track components 11 are then fixed to the turbine top cover or bottom ring by locking components.

[0060] The detection fixture 2 is manually moved to move on the multi-segment arc track 11 to detect the guide vanes at different positions. After being adjusted to a suitable position, the detection fixture 2 is fixed by the limiting component 210 to maintain overall stability during use.

[0061] See Figure 9 The first drive lifting structure adjusts the height of the end face gap detection end 287, and then the connecting arms 286 on both sides are manually adjusted to achieve simultaneous detection of the two guide vanes. During detection, the second servo motor 2874 drives the first ranging sensor 2875 to emit a laser to detect the initial detection point and obtain D. m The angle sensor detects the angle as θ, according to the formula The vertical displacement is obtained, and then the current spacing distance is calculated based on the initial end face gap.

[0062] The benchmark for measuring the end face gap is a theoretical design value. It is measured and recorded using a high-precision method at a certain calibrated position after the guide vane is installed and qualified, such as when the guide vane is fully closed. In this state, there is a height y from the lower end to the top end of the guide vane. The offset is y-Δy. The actual gap is the theoretical value plus the offset. The laser irradiation point is the end face of the guide vane.

[0063] S4. Adjust the end face clearance of the guide vane to a suitable clearance distance based on the end face clearance value obtained in S3.

[0064] See Figure 10 The servo lifting mechanism 29 drives the facade gap detection component 214 to adjust its height. The third servo motors 2142 on both sides adjust the angles of the second distance sensors 2145 and the third distance sensors 2146 on both sides respectively, so that they are perpendicular to the guide vane surface of the facade gap to be detected. The second distance sensor 2145 emits a laser to the sealing surface of guide vane A, and outputs the distance value after receiving the reflected light. ， The third ranging sensor 2146 emits a laser to the sealing surface of guide vane B and outputs a distance value. According to the formula Calculate the facade gap G; where, L Indicates the center-to-center distance between the two sensors; This is the theoretical thickness of the guide vane sealing surface.

[0065] S6. Adjust the guide vane clearance based on the data obtained from S5. S7. Move the inspection fixture 2 and perform gap inspection on the remaining guide vanes.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tooling for inspecting the clearance of movable guide vanes in a water turbine, characterized in that, Includes a ring track (1) and a testing fixture (2); Multiple locking components are provided on the ring rail (1), which are used to connect with the top cover or bottom ring of the turbine; The inspection fixture (2) includes a movable frame and an end face gap detection component (28) and a vertical face gap detection component (214) mounted on the movable frame. The movable frame is movably mounted on the ring rail (1) and can move and be positioned in a ring along the ring rail (1). The end face gap detection assembly (28) includes a first drive lifting structure, a connecting arm (286) and an end face gap detection end (287). The first drive lifting structure is mounted on a movable frame. One end of the connecting arm (286) is connected to the first drive lifting structure, and the other end is connected to the end face gap detection end (287). The connecting arm (286) is adjusted vertically by the first drive lifting structure. The end face gap detection end (287) includes a first distance sensor (2875). The facade gap detection assembly (214) includes a second distance sensor (2145) and a third distance sensor (2146).

2. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 1, characterized in that, The first drive lifting structure includes a conveying frame (281), which is fixed on a movable frame. A sliding groove is provided on the front end face of the conveying frame (281), and a slider (282) is installed in the sliding groove. A first servo motor (288) is installed at the upper end of the sliding groove. A lead screw (289) is connected to the output end of the first servo motor (288). The lead screw (289) is screwed to the slider (282). A connecting arm (286) is connected to the slider (282).

3. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 2, characterized in that, The slider (282) is connected to one or two hinge ends (283). A hinge groove (285) is provided in the middle of the hinge end (283). A hinge part (284) is hinged in the hinge groove (285). A connecting arm (286) is fixedly connected to the side of the hinge part (284).

4. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 3, characterized in that, The upper and / or lower sides of the hinge portion (284) are provided with friction rings (2810), which abut against the hinge end (283).

5. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 1, characterized in that, The end face gap detection end (287) also includes a mounting base (2871) fixedly connected to the connecting arm (286). A second servo motor (2874) is mounted on the mounting base (2871). A first distance sensor (2875) and a first angle sensor (2873) are mounted on the output end of the second servo motor (2874). The first angle sensor (2873) and the first distance sensor (2875) are fixedly connected.

6. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 1, characterized in that, The second ranging sensor (2145) and the third ranging sensor (2146) are respectively mounted on two mounting plates (2143), and the two mounting plates (2143) are respectively mounted on two third servo motors (2142). The two third servo motors (2142) are both mounted on the moving frame. The lower end of the mounting plate (2143) is fixedly connected to a limit ring (2144), and the limit ring (2144) is rotatably connected to the moving frame.

7. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 1, characterized in that, The facade gap detection component (214) also includes a cable tray (2141), with a connecting rod (213) fixedly connected to the bottom of the cable tray (2141). The connecting rod (213) is connected to the movable end of the servo lifting mechanism (29). The servo lifting mechanism (29) is installed on the movable frame. The connecting rod (213) is vertically arranged and is driven to move vertically through the servo lifting mechanism (29). The second distance sensor (2145) and the third distance sensor (2146) are installed on the cable tray (2141).

8. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 7, characterized in that, The second ranging sensor (2145) and the third ranging sensor (2146) are respectively mounted on two mounting plates (2143), and the two mounting plates (2143) are respectively mounted on two third servo motors (2142). The two third servo motors (2142) are both mounted on the bridge frame (2141). The lower end of the mounting plate (2143) is fixedly connected to a limit ring (2144), and the limit ring (2144) is rotatably connected to the bridge frame (2141).

9. A tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 1, 5, 6, 7, or 8, characterized in that, The mobile frame is equipped with a power supply module (23), a controller (2147) and a display screen (27); the power supply module (23) is electrically connected to the controller (2147), and the controller (2147) is electrically connected to the electrical components in the end face gap detection component (28) and the vertical face gap detection component (214).

10. The tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 1, characterized in that, The movable frame includes an upper plate (21), the lower surface of the upper plate (21) is connected to the lower plate (22) by connecting columns (24) around the perimeter, the bottom of the lower plate (22) is provided with a bottom groove (25), the upper outer side of the ring rail (1) is fixed with a track protrusion (14), the track protrusion (14) extends into the bottom groove (25), the track protrusion (14) and the bottom groove (25) slide and guide each other; the locking member is installed on the upper inner side of the ring rail (1).

11. A tooling for inspecting the clearance of movable guide vanes of a water turbine according to claim 1 or 10, characterized in that, The ring track (1) is composed of multiple arc-shaped track components (11) spliced ​​together.

12. A tooling for checking the clearance of movable guide vanes of a water turbine according to claim 1 or 10, characterized in that, The locking component includes a receiving sleeve (12), the inner hole of which is threadedly connected to an adjusting screw (13). The inner hole of the receiving sleeve (12) passes through the ring rail (1). A strong magnet is fixedly or rotatably connected to the lower end of the adjusting screw (13) inside the receiving sleeve (12). The strong magnet is magnetically connected to the top cover or bottom ring of the turbine for positioning.

13. A method for inspecting the clearance of movable guide vanes in a water turbine, using the tooling for inspecting the clearance of movable guide vanes in a water turbine as described in claim 1, characterized in that, The gap inspection method includes the following steps: S1. Position the ring rail (1) on the top cover or bottom ring of the turbine using some locking parts, adjust the position of the ring rail (1) so that the center of the ring rail (1) coincides with the center of the turbine main shaft, and then fix the ring rail (1) using all locking parts. S2. Install the inspection fixture (2) on the ring rail (1), move the inspection fixture (2) to the inspection position of the corresponding guide vane; S3. The first drive lifting structure drives the end face gap detection end (287) to adjust its height, so that the first distance sensor (2875) is at the same height as the end face of the guide vane to be detected. The first distance sensor (2875) emits a laser to detect the initial detection point and obtain D. m According to the formula The vertical displacement is obtained, and the current spacing is calculated based on the initial end face gap. S4. Adjust the end face clearance of the guide vane to a suitable clearance distance based on the end face clearance value obtained in S3. S5, the second distance sensor (2145) and the third distance sensor (2146) are perpendicular to the surface of the guide vane of the facade gap to be detected. The second distance sensor (2145) measures the sealing surface of guide vane A and outputs the distance value. The third distance sensor (2146) measures the sealing surface of guide vane B and outputs the distance value. ; According to the formula Calculate the facade gap G; in, This is the theoretical thickness of the guide vane sealing surface; S6. Adjust the guide vane clearance based on the data obtained from S5. S7. Move the inspection fixture (2) in a circular motion and inspect the gaps of the remaining guide vanes.

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