Turbine blade simulation assembly measuring tool

Abstract

The invention relates to the technical field of assembly measuring tools, in particular to a steam turbine blade simulation assembly measuring tool which comprises a positioning disc set, a blade root clamping piece and a plurality of driving teeth. The positioning disc set comprises a rotating disc base, a threaded chain wheel, a tooth guide rod, a pull lug rod and a sliding sleeve piece, and bevel teeth and threads meshed with the driving teeth are arranged in the threaded chain wheel and used for driving the tooth guide rod to slide in the radial direction. The tooth guide rod drives the lug pulling rod to slide through the linkage plate, an inclined sliding groove and an inclined wedge face are arranged on the surface of the lug pulling rod, and the lug pulling rod is in sliding fit with a sliding guide block and a pulley on the inner side of the sliding sleeve piece to achieve clamping or loosening action. The blade root clamping piece comprises a fixed plate part, an elastic lug part and a blade root clamping lug, and the blade root clamping lug is arranged in a V shape. According to the invention, multi-point synchronous clamping and automatic loosening of the blade root of the blade are realized, the clamping force is uniform, the clamping precision is high, nondestructive fitting is realized, the operation is convenient and fast, and the precision and efficiency of assembling and measuring the blade of the steam turbine are obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of assembly gauges, in particular to a steam turbine blade simulation assembly gauge. BACKGROUND

[0002] The steam turbine blade is a key energy conversion component in the steam turbine, and the blade root part bears high temperature, high speed and periodic stress, so the blade root assembly precision, stress balance and positioning consistency must be ensured during assembly and detection. In order to ensure the matching and stability of the blade in the unit assembly, the industry usually uses a blade assembly simulation gauge for pre-assembly detection to verify the assembly gap between the blade root groove and the blade, the clamping precision and the stress distribution.

[0003] The existing steam turbine has great centrifugal force, thermal expansion and vibration during high-speed rotation. In order to ensure the stability and service life of the system, a small assembly gap is usually designed between the blade and the impeller disc, which can realize self-adaptive cooperation and form a "dynamic balance" state during operation.

[0004] In actual production and maintenance process, in order to verify the matching of the blade structure or assembly process, simulation assembly test is usually needed. Such test aims to clamp, align and observe the deformation of the blade by the gauge in the non-operation state, so as to judge the dynamic behavior of the blade in the working state.

[0005] However, the simulation assembly test fixture in the prior art mostly adopts rigid clamping jaw, mechanical clamping or bolt locking mode, which has the following defects: Lack of real assembly state simulation capability: the traditional fixture mainly adopts rigid clamping, which cannot accurately restore the assembly state of the gap reserved for the blade in the impeller disc, resulting in large deviation between the simulation result and the actual result.

[0006] Cannot realize dynamic gap adjustment and self-locking retention: the steam turbine blade is not fixed during operation, but produces a small displacement and deformation around the assembly groove. The existing fixture cannot adjust or retain the specific gap state, and also lacks reliable retention capability after clamping deformation.

[0007] Poor clamping synchronization and easy to produce deflection stress: due to the lack of multi-point synchronous control mechanism, problems such as uneven clamping and asymmetric stress often occur, which affects the accuracy and stability of the simulation test.

[0008] Therefore, there is an urgent need for an assembly test fixture structure which can truly simulate the actual assembly gap of the steam turbine blade, has flexible self-adaptive capability and controllable stable clamping process, so as to meet the needs of modern steam turbine high-precision simulation test. SUMMARY

[0009] The present application aims to solve one of the technical problems existing in the prior art or related art.

[0010] To this end, the technical solution adopted by the present application is: a steam turbine blade simulation assembly gauge, comprising a positioning disc set, a blade root clamping piece and a driving tooth assembly, the inside of the positioning disc set is provided with a gear transmission and sliding guide mechanism, the driving tooth drives the tooth guide rod to move in the radial direction through the meshing structure, and then drives the blade root clamping piece to clamp the blade root of the steam turbine blade synchronously, realizing uniform and stable clamping force output. Through the cooperative design of thread transmission, wedge guide and flexible clamping structure, the gauge has the functions of synchronous clamping, self-locking positioning and non-destructive clamping, and can effectively simulate the stress and matching state of the steam turbine blade in the actual assembly process.

[0011] The steam turbine blade simulation assembly gauge provided by the present application comprises a positioning disc set, a blade root clamping piece and a plurality of driving teeth rotatably installed on the inside of the positioning disc set. The positioning disc set comprises a rotating disc seat, a threaded disc, a tooth guide rod, a pull ear rod and a sliding sleeve piece. The threaded disc is provided with a bevel gear that meshes with the driving tooth for transmission, and the screw thread on the surface thereof meshes with the tooth guide rod. The tooth guide rod is connected with the pull ear rod, and transmits the radial force through a linkage plate to drive the sliding sleeve piece to slide. The sliding sleeve piece drives the blade root clamping ear to clamp the blade root of the steam turbine blade through a connecting ear. This structure realizes synchronous clamping or loosening of all blade root clamping pieces after a single driving tooth input torque, thereby realizing multi-point synchronous control, improving clamping stability and repeatability.

[0012] In a preferred example, it is further configured that the number of blade root clamping pieces is several and they are uniformly distributed on the outer periphery of the rotating disc seat, and each guide ear is symmetrically arranged on both sides of the blade root clamping piece for guiding the pull ear rod to slide in the radial direction.

[0013] Specifically, the symmetrical guide structure can ensure consistent action of each clamping piece, avoid uneven clamping force caused by guide deviation, and thus make the blade root positioning more accurate.

[0014] In a preferred example, it is further configured that the inclined wedge surface on the surface of the pull ear rod and the pulley on the inside of the sliding sleeve piece slide against each other, the inclined sliding groove cooperates with the sliding guide block, and the sliding sleeve piece smoothly slides in the radial direction of the pull ear rod.

[0015] Specifically, the wedge guide structure realizes clamping force multiplication through mechanical amplification, and the pulley rolling guide can significantly reduce the friction resistance, ensuring smooth clamping action without jamming phenomenon.

[0016] In a preferred example, it is further configured that the inclined sliding groove and the inclined wedge surface on the inside of the sliding sleeve piece are arranged in parallel with each other, and the sliding guide block and the pulley are in contact with each other respectively, realizing double guide limiting.

[0017] Specifically, the double-sided guide structure can effectively prevent the sliding sleeve from tilting or deviating, so that the force direction during clamping is more stable, and the linear transmission precision of mechanical linkage is enhanced.

[0018] In a preferred example, the plurality of tooth guide rods are uniformly distributed in the circumferential direction inside the rotating disc seat, and the rotating disc seat is internally provided with through holes for guiding the radial sliding of the tooth guide rods.

[0019] Specifically, the tooth guide rod uniform distribution structure ensures that the clamping force is distributed symmetrically, forming a circumferential balanced stress field during multi-point clamping, thereby avoiding simulation errors caused by uneven stress on the blade root.

[0020] In a preferred example, the blade root clamping piece comprises a fixed plate part, an elastic ear part and a blade root clamping ear, which are integrally formed. The fixed plate part and the elastic ear part have elastic deformation characteristics and can perform micro-displacement compensation during clamping. The surface of the blade root clamping ear is provided with a toothed edge matched with the blade root of the steam turbine blade.

[0021] Specifically, the elastic structure can automatically compensate for assembly gaps, ensure flexible fitting of the blade root, reduce surface damage, and improve the reliability of blade root clamping and simulation assembly accuracy.

[0022] In a preferred example, one end of the sliding sleeve is inserted through the elastic ear part and movably connected with the connecting ear, and the surface of the connecting ear is provided with a through hole for guiding the sliding sleeve to slide perpendicular to the pulling ear rod.

[0023] Specifically, the guide structure can ensure the accurate movement path of the sliding sleeve and prevent the clamping piece from being twisted during movement, thereby improving the synchronization of the clamping action.

[0024] In a preferred example, a plurality of driving teeth are uniformly distributed in the circumferential direction inside the rotating disc seat and are in meshing transmission with the threaded disc. One side of the driving teeth is provided with an internal hexagonal hole for controlling rotation by a hexagonal wrench.

[0025] Specifically, the design can realize manual or motorized control of clamping operation, and the hexagonal wrench driven has good torque control accuracy, ensuring the effect of multi-point synchronous clamping and the consistency of repeated operation.

[0026] The beneficial effects achieved by the present application are: 1. In the present application, the blade root clamping ear with a flexible tooth structure simulates the structural characteristics of the installation groove on the surface of the impeller disc, forms a non-rigid fitting mode when clamping the blade root, thereby accurately retaining the required play in the actual assembly of the impeller, enabling the blade to exhibit similar cooperation behavior in the test process as in the running state, and improving the accuracy and representativeness of the simulation test.

[0027] 2. The present application can control the deformation adjustment of the clamping ears by setting the inclined sliding groove and inclined wedge surface on the ear pulling rod and cooperating with the traction of the sliding sleeve assembly, so as to realize the precise regulation of the blade root clamping gap and meet the assembly simulation requirements under different blades or different test conditions.

[0028] 3. The present application can automatically maintain the deformation state of the flexible clamping ear after clamping is completed through the inclined sliding groove and inclined wedge surface on the ear pulling rod, and does not rely on additional external force for maintenance, thereby effectively avoiding the unstable clamping problem caused by reverse sliding or loosening, improving the structural reliability and measurement consistency in the test process, and ensuring the effectiveness of the test data. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the overall structure schematic diagram of an embodiment of the present application. Figure 2 It is the surface structure schematic diagram of the positioning disc group of an embodiment of the present application. Figure 3 It is the tooth guide rod and driving tooth transmission structure schematic diagram of an embodiment of the present application. Figure 4 It is the thread tooth disc and tooth guide rod transmission structure schematic diagram of an embodiment of the present application. Figure 5 It is the partial cross-section structure schematic diagram of the positioning disc group of an embodiment of the present application. Figure 6 It is the tooth guide rod, ear pulling rod and sliding sleeve assembly structure schematic diagram of an embodiment of the present application. Figure 7 It is the surface structure schematic diagram of the blade root clamping piece of an embodiment of the present application.

[0030] Reference signs: 100, positioning disc group; 110, rotating disc seat; 111, guide ear; 120, thread tooth disc; 130, tooth guide rod; 140, ear pulling rod; 150, sliding sleeve assembly; 121, bevel gear; 122, screw thread; 141, linkage plate; 142, inclined sliding groove; 143, inclined wedge surface; 151, sliding guide block; 152, pulley; 200, blade root clamping piece; 210, fixed plate part; 220, elastic ear part; 230, blade root clamping ear; 231, connecting ear; 300, driving tooth; 400, hexagonal wrench. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with specific embodiments and with reference to the drawings. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] It is to be understood that the descriptions are only exemplary and are not intended to limit the scope of the present application.

[0033] Some embodiments of the present application provide a steam turbine blade simulation assembly measuring tool.

[0034] In combination Figures 1-7 As shown in the drawings, the steam turbine blade simulation assembly measuring tool provided by the present application comprises a positioning disc set 100, a blade root clamping piece 200, and a plurality of driving teeth 300 rotatably installed on the inner side of the positioning disc set 100, and the structure and working process thereof are as follows: In this embodiment, the positioning disc set 100 is the main support structure of the present application, which is used to form the installation and transmission base of each blade root clamping piece. The positioning disc set 100 comprises a rotating disc seat 110, a threaded disc 120, a tooth guide rod 130, a pull ear rod 140, and a sliding sleeve piece 150. A plurality of guide ears 111 are fixedly installed on the outer periphery of the rotating disc seat 110, and the guide ears 111 are evenly distributed in the circumferential direction, which are used to guide the radial sliding of the pull ear rod 140. The threaded disc 120 is rotatably installed on the inner side of the positioning disc set 100, forming an annular rotating base. The threaded disc 120 is provided with a bevel gear 121 on one side, which is in meshing transmission with the surface of the driving tooth 300, and is provided with a screw thread 122 on the other side, which is in meshing with the outer surface of the tooth guide rod 130, which is used to convert the rotary motion of the driving tooth 300 into the radial sliding of the tooth guide rod 130.

[0035] A plurality of tooth guide rods 130 are evenly distributed along the circumferential direction of the rotating disc seat 110, and a through hole for guiding the radial sliding of the tooth guide rod 130 is formed on the inner side of the rotating disc seat 110. The outer end of the tooth guide rod 130 is fixedly connected with the pull ear rod 140, and the front end thereof is provided with a linkage plate 141, which is used to transmit the radial thrust to drive the clamping action of the blade root clamping piece 200.

[0036] In this embodiment, the pull ear rod 140 is slidably installed on the surface of the guide ear 111 and arranged in the radial direction. The surface of the pull ear rod 140 is provided with an inclined sliding groove 142 and an inclined wedge surface 143, wherein the inclined sliding groove 142 is symmetrically arranged on both sides of the pull ear rod 140 and is arranged in parallel with the inclined wedge surface 143. The sliding sleeve piece 150 is slidably sleeved on the outer surface of the pull ear rod 140, and the inner side thereof is provided with a sliding guide block 151 and a sliding pulley 152 which are in sliding abutment with the inclined sliding groove 142 and the inclined wedge surface 143, respectively.

[0037] When the tooth guide rod 130 moves in the radial direction, the linkage plate 141 pushes the pull ear rod 140 to slide synchronously, and the inclined sliding groove 142 and the inclined wedge surface 143 drive the sliding sleeve piece 150 to slide inward or outward, realizing the clamping or loosening action. The sliding pulley 152 is in rolling contact with the inclined wedge surface 143, which reduces the friction and ensures smooth action.

[0038] In this embodiment, the blade root clamping piece 200 is installed on the outer periphery of the rotary disc seat 110 for clamping simulation of the turbine blade root.

[0039] The blade root clamping piece 200 comprises a fixed plate part 210, an elastic ear part 220 and a blade root clamping ear 230. The blade root clamping ear 230 is symmetrically arranged in a V shape, and a connecting ear 231 is fixedly installed on the surface of the two blade root clamping ears 230 and is movably connected with the end of the sliding sleeve piece 150 through the connecting ear 231, so as to convert the displacement of the sliding sleeve piece 150 into clamping movement of the blade root clamping ear 230.

[0040] The fixed plate part 210, the elastic ear part 220 and the blade root clamping ear 230 can adopt an integral forming structure, wherein the fixed plate part 210 and the elastic ear part 220 are elastic and can provide buffering and compensation effects in the clamping process. The surface of the blade root clamping ear 230 is provided with a toothed edge which is matched with the shape of the turbine blade root, for enhancing clamping friction and realizing high-precision positioning of simulation assembly.

[0041] In this embodiment, a plurality of driving teeth 300 are uniformly distributed on the inner side of the rotary disc seat 110, and the outer side is provided with a bevel gear 121 which is engaged with the threaded gear plate 120. The driving teeth 300 are matched with the hexagonal wrench 400 through an internal hexagonal hole structure, so as to realize manual or mechanical torque input.

[0042] When the driving teeth 300 rotate, the threaded gear plate 120 is driven to rotate, so that the tooth guide rod 130 moves in and out along the radial direction; the tooth guide rod 130 drives the pull ear rod 140 to slide through the linkage plate 141, transmits the movement to the sliding sleeve piece 150 through the wedge structure, and finally drives the blade root clamping ear 230 to clamp or release the turbine blade root through the connecting ear 231, so as to realize synchronous clamping control.

[0043] Working principle and use process of the present application: When the blade simulation assembly is performed, the operator first fixes the measuring tool on the assembly platform, so that the positioning disc set 100 is in a horizontal stable state. A plurality of circumferentially distributed blade root clamping pieces 200 form a circumferential assembly simulation channel of the blade root, and each blade root clamping piece can be adjusted individually or synchronously to adapt to different specifications of the blade root size.

[0044] In the operation process, the hexagonal wrench 400 is inserted into the internal hexagonal hole of the driving tooth 300 located on the outer periphery of the measuring tool, the threaded gear plate 120 is driven to rotate by rotating the driving tooth 300. The bevel gear 121 on the threaded gear plate 120 is engaged with the driving tooth 300 to realize transmission, and the screw thread 122 on the surface of the threaded gear plate is engaged with a plurality of tooth guide rods 130, so that the tooth guide rods move in and out along the radial direction.

[0045] The front end of the tooth guide rod 130 is fixedly connected with the linkage plate 141, and the linkage plate drives the pull ear lever 140 to slide along the direction of the guide ear 111. When the tooth guide rod moves inward, the linkage plate pushes the pull ear lever to tighten, and the inclined sliding groove 142 arranged on the surface of the linkage plate and the inclined wedge surface 143 are guided to slide with the sliding guide block 151 and the pulley 152 inside the sliding sleeve assembly 150, so that the sliding sleeve assembly 150 is inwardly closed.

[0046] One end of the sliding sleeve assembly 150 is movably connected with the connecting ear 231 on the blade root clamping assembly 200, and when the sliding sleeve assembly is closed, the V-shaped synchronous clamping movement of the blade root clamping ear 230 is formed, the tooth edge on the surface of the blade root clamping ear is matched with the blade root part of the steam turbine blade, and the simulation clamping and positioning effect on the blade root is formed.

[0047] Clamping and adjusting process: Initial positioning: the blade root part of the steam turbine blade is inserted between the two blade root clamping ears 230, and the blade root of the blade is matched with the tooth edge.

[0048] Synchronous clamping: the operator rotates any one driving tooth 300 by using the hexagonal wrench 400, and since each driving tooth is meshed with the threaded disc 120, the plurality of tooth guide rods 130 will simultaneously slide along the radial direction, synchronous clamping of all clamping assemblies is realized, the blade root is uniformly stressed, and stable fixation is formed.

[0049] Precision adjustment: according to the blade model or assembly gap requirement, the rotation angle of each driving tooth can be finely adjusted to realize accurate control of the clamping force and assembly spacing; the elastic ear part 220 provides a micro-elastic compensation, so that the blade root clamping is more smooth and the gap is automatically eliminated.

[0050] Loosening and disassembly: the driving tooth 300 is counterclockwise rotated to drive the threaded disc 120 to rotate in the opposite direction, so that the tooth guide rod 130 moves outward along the radial direction, the pull ear lever 140 is opened, the sliding sleeve assembly 150 is moved outward, the blade root clamping ear 230 is opened, and the automatic loosening of the blade root is realized.

[0051] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A turbine blade mockup assembly gauge, characterized by, The utility model relates to a turbine blade root clamping device, including positioning disc group (100), blade root clamping piece (200) and a plurality of rotation installation in the inside of positioning disc group (100) drive tooth (300), positioning disc group (100) includes carousel seat (110), screw thread tooth disc (120), tooth guide rod (130), pull ear lever (140) and sliding sleeve spare (150), the outer periphery of carousel seat (110) is fixedly installed with a plurality of guide lug (111), Blade root clamping piece (200) can be detachably installed in the outer periphery of carousel seat (110), pull ear lever (140) is slidably installed on the surface of guide lug (111), and is oppositely arranged on both sides of blade root clamping piece (200), one end of two pull ear levers (140) is equipped with linkage plate (141) and is fixedly connected with the surface of tooth guide rod (130), sliding sleeve spare (150) is slidably sleeved on the outer surface of pull ear lever (140), The surface of pull ear lever (140) is provided with inclined sliding groove (142) and inclined wedge surface (143), the inner side of sliding sleeve spare (150) is provided with sliding guide block (151) and pulley (152) respectively slidably abutting with inclined sliding groove (142) and inclined wedge surface (143), The inclined wedge surface (143) of the surface of pull ear lever (140) is in the form of an inclined surface, and the width of the pull ear lever (140) gradually decreases along the radial direction of the carousel seat (110), and the pulley (152) is slidably abutted with the surface of the inclined wedge surface (143).

2. The steam turbine blade mockup alignment gauge of claim 1, wherein, The number of blade root clamping piece (200) is several and evenly distributed on the outer periphery of carousel seat (110), and a plurality of guide lugs (111) are symmetrically arranged on both sides of blade root clamping piece (200) to guide the sliding of pull ear lever (140).

3. A steam turbine blade mockup assembly gauge according to claim 2, wherein, Blade root clamping piece (200) includes fixed plate part (210), elastic lug (220) and blade root clamping lug (230), blade root clamping lug (230) is symmetrically arranged in the form of V, for clamping the blade root part of steam turbine blade, the surface of two blade root clamping lugs (230) is fixedly installed with connecting lug (231), and is movably connected with the end of sliding sleeve spare (150) through connecting lug (231).

4. A steam turbine blade mockup assembly gauge according to claim 3, wherein, The fixed plate part (210), the elastic lug (220) and the blade root clamping lug (230) are integrally formed, and the fixed plate part (210) and the elastic lug (220) are elastic, for guiding the blade root clamping lug (230) to clamp the blade root part of the steam turbine blade, and the surface of the blade root clamping lug (230) is provided with a tooth edge matched with the blade root part of the steam turbine blade.

5. The steam turbine blade mockup alignment gauge of claim 1, wherein, A plurality of tooth guide rods (130) are evenly distributed along the circumferential direction of the carousel seat (110), and the inner side of the carousel seat (110) is provided with a through hole for guiding the radial sliding of the tooth guide rod (130).

6. The steam turbine blade mockup alignment gauge of claim 1, wherein, One end of the sliding sleeve spare (150) penetrates the surface of the elastic lug (220) and is movably connected with the connecting lug (231), and the surface of the guide lug (111) is provided with a through hole for penetrating the sliding sleeve spare (150) to guide the sliding of the sliding sleeve spare (150) in the direction perpendicular to the surfaces of the guide lug (111) and the pull ear lever (140).

7. The steam turbine blade mockup alignment gauge of claim 1, wherein, The thread disc (120) is rotatably installed on the inner side of the positioning disc group (100), one side of which is provided with bevel gears (121) for surface engagement transmission with the driving teeth (300); one side of the thread disc (120) is provided with a screw thread (122) and is in surface engagement transmission with the tooth guide rod (130).

8. The steam turbine blade mockup alignment gauge of claim 1, wherein, A plurality of the driving teeth (300) are uniformly distributed along the circumferential direction of the inner side of the rotating disc seat (110) and are in surface engagement transmission with the thread disc (120), one side of the driving teeth (300) is provided with an inner hexagonal hole for rotation control by a hexagonal wrench (400).

9. The steam turbine blade mockup alignment gauge of claim 1, wherein, The inclined sliding grooves (142) are symmetrically arranged on both sides of the pull ear lever (140) and are arranged in parallel with the inclined wedge surfaces (143), and the sliding guide blocks (151) are slidably sleeved on the inner side of the inclined sliding grooves (142).

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