A steam turbine blade analog assembly gauge

Abstract

The present application relates to the technical field of assembly gauge, in particular to a steam turbine blade simulation assembly gauge, which comprises a positioning disc group, a blade root clamping piece and a plurality of driving teeth. The positioning disc group 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 internally provided with bevel gears and screw threads for engaging with the driving teeth, so as to drive the tooth guide rod to slide in the radial direction. The tooth guide rod drives the pull ear rod to slide through a linkage plate. The surface of the pull ear rod is provided with an inclined sliding groove and an inclined wedge surface, and is in sliding cooperation with a sliding guide block and a pulley on the inner side of the sliding sleeve piece, so as to realize clamping or loosening actions. The blade root clamping piece comprises a fixed plate part, an elastic ear part and a blade root clamping ear, and the blade root clamping ear is arranged in a V shape. The present application realizes multi-point synchronous clamping and automatic loosening of the blade root, has the advantages of uniform clamping force, high clamping precision, non-destructive fitting and convenient operation, and significantly improves the precision and efficiency of steam turbine blade assembly measurement.

Description

Technical Field

[0001] This invention relates to the field of assembly measuring tool technology, specifically to a turbine blade simulation assembly measuring tool. Background Technology

[0002] Turbine blades are critical energy conversion components in steam turbines. Their blade roots bear the brunt of high temperatures, high speeds, and cyclic stresses. Therefore, during assembly and testing, it is essential to ensure the accuracy of blade root assembly, stress balance, and consistent positioning. To ensure the compatibility and stability of blades during unit assembly, the industry typically uses blade assembly simulation testing fixtures for pre-assembly testing to verify the assembly clearance, clamping accuracy, and stress distribution between the blade root groove and the blade.

[0003] Existing steam turbines experience significant centrifugal force, thermal expansion, and vibration during high-speed rotation. To ensure system stability and lifespan, a small assembly gap is typically designed between the blades and the impeller disk. This gap allows for adaptive fit, thereby achieving a "dynamic balance" state during operation.

[0004] In actual production and maintenance, simulated assembly tests are usually required to verify the compatibility of blade structure or assembly process. These tests aim to clamp, align, and observe the deformation of blades using measuring tools in a non-operational state to determine their dynamic behavior under operating conditions.

[0005] However, most existing simulation assembly test fixtures use rigid jaws, mechanical clamping, or bolt locking methods, which have the following drawbacks:

[0006] Lack of ability to simulate real assembly state: Traditional fixtures mainly rely on rigid clamping, which cannot accurately reproduce the assembly state of the blade clearance reserved in the impeller disk, resulting in a large deviation between the simulation results and reality.

[0007] Unable to achieve dynamic clearance adjustment and self-locking retention: Turbine blades are not stationary during operation, but rather undergo minute displacements and deformations around the assembly slot. Existing clamps cannot adjust or maintain a specific clearance state, nor do they have the ability to reliably retain the blades after clamping deformation.

[0008] Poor clamping synchronization and easy to generate skewed stress: Due to the lack of a multi-point synchronous control mechanism, problems such as uneven clamping and asymmetrical force often occur, which in turn affect the accuracy and stability of simulation tests.

[0009] Therefore, there is an urgent need for an assembly and testing fixture structure that can realistically simulate the actual assembly gap of steam turbine blades, has flexible adaptive capabilities, and has a controllable and stable clamping process, in order to meet the needs of high-precision simulation testing of modern steam turbines. Summary of the Invention

[0010] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0011] Therefore, the technical solution adopted in this invention is as follows: a turbine blade simulation assembly measuring tool, comprising a positioning disk assembly, a blade root clamping component, and a drive gear assembly. The positioning disk assembly is internally equipped with a gear transmission and sliding guide mechanism. The drive gear, through a meshing structure, drives the tooth guide rod to move radially, thereby driving the blade root clamping component to synchronously clamp the root of the turbine blade, achieving uniform and stable clamping force output. This invention, through the coordinated design of threaded transmission, wedge guidance, and a flexible clamping structure, enables the measuring tool to possess the functions of synchronous clamping, self-locking positioning, and non-destructive clamping, effectively simulating the force and fit state of turbine blades during actual assembly.

[0012] The turbine blade simulation assembly fixture provided by this invention includes a positioning disk assembly, blade root clamping components, and several drive teeth rotatably mounted inside the positioning disk assembly. The positioning disk assembly includes a turntable base, a threaded sprocket, a toothed guide rod, a pull rod, and a sliding assembly. The threaded sprocket has beveled teeth that mesh with the drive teeth, and its threads mesh with the toothed guide rod. The toothed guide rod is connected to the pull rod and transmits radial force through a linkage plate to drive the sliding assembly to slide. The sliding assembly, through a connecting lug, drives the blade root clamping lug to clamp the turbine blade root. This structure enables the simultaneous clamping or loosening of all blade root clamping components by inputting torque from a single drive tooth, thereby achieving multi-point synchronous control and improving clamping stability and repeatability.

[0013] In a preferred example, the blade root clamps are further configured such that the number of blade root clamps is several and they are evenly distributed around the outer periphery of the turntable seat, and each guide lug is symmetrically arranged on both sides of the blade root clamps to guide the pull lug rod to slide parallel to the radial direction.

[0014] Specifically, this symmetrical guide structure ensures that the actions of each clamping component are consistent, avoiding uneven clamping force due to guide deviation, thereby making the blade root positioning more accurate.

[0015] In a preferred embodiment, the inclined wedge surface of the pull rod surface slides against the pulley inside the slide assembly, the inclined groove cooperates with the guide block, and the slide assembly slides smoothly along the radial direction of the pull rod.

[0016] Specifically, the inclined wedge guide structure achieves a multiplication of clamping force through mechanical amplification, while the rolling guide of the pulley can significantly reduce frictional resistance, ensuring smooth clamping action without jamming.

[0017] In a preferred example, the inclined groove and the inclined wedge surface on the inner side of the sliding component are arranged parallel to each other, and the sliding guide block and the pulley are respectively in contact to achieve dual guide limit.

[0018] Specifically, the double-sided guide structure can effectively prevent the sliding parts from tilting or shifting, making the force direction more stable during the clamping process and enhancing the linear transmission accuracy of the mechanical linkage.

[0019] In a preferred embodiment, a plurality of toothed guide rods are evenly distributed along the circumferential direction inside the turntable seat, and a through hole is provided on the inner side of the turntable seat to guide the toothed guide rods to slide radially.

[0020] Specifically, the uniformly distributed toothed guide rod structure ensures a symmetrical distribution of clamping force, forming a circumferentially balanced stress field during multi-point clamping, thus avoiding simulation errors caused by uneven force on the blade root.

[0021] In a preferred embodiment, the blade root clamping component is further configured such that it comprises a fixed plate, an elastic lug, and a blade root clamping lug, all three being integrally formed. The fixed plate and the elastic lug have elastic deformation characteristics, enabling micro-displacement compensation during clamping, and the surface of the blade root clamping lug is provided with toothed ridges that match the blade root of the turbine blade.

[0022] Specifically, the elastic structure can automatically compensate for assembly gaps, ensure flexible fit of the blade root under force, reduce surface damage, and improve the reliability of blade root clamping and the accuracy of simulated assembly.

[0023] In a preferred example, the slide piece is further configured such that one end of the slide piece passes through the elastic ear and is movably connected to the connecting ear, and the surface of the guide ear is provided with a through hole for guiding the slide piece to slide perpendicular to the pull ear rod.

[0024] Specifically, this conductive structure ensures the precise movement path of the sliding component, prevents twisting during the movement of the clamping component, and improves the synchronization of the clamping action.

[0025] In a preferred embodiment, the configuration is further as follows: a plurality of drive teeth are evenly distributed along the circumferential direction on the inner side of the turntable seat and mesh with the threaded toothed disc for transmission; one side of the drive teeth is provided with an internal hexagonal hole for a hexagonal wrench to control the rotation.

[0026] Specifically, the design enables clamping operations to be controlled manually or mechanically, and the torque control precision is excellent when driven by a hex wrench, ensuring multi-point synchronous clamping effect and consistency in repeated operations.

[0027] The beneficial effects achieved by this invention are as follows:

[0028] 1. In this invention, the flexible toothed blade root clamp simulates the structural characteristics of the mounting groove on the impeller disk surface. When clamping the blade root, a non-rigid fit is formed, thereby accurately preserving the movement clearance required in the actual assembly of the impeller. This allows the blade to exhibit similar matching behavior to the operating state during the test, improving the accuracy and representativeness of the simulation test.

[0029] 2. By setting the inclined groove and inclined wedge surface on the pull rod, and in conjunction with the traction action of the sliding assembly, the present invention can produce controllable deformation adjustment of the clamping lug, thereby achieving precise control of the blade root clamping gap and meeting the assembly simulation requirements of different blades or different test conditions.

[0030] 3. The present invention can automatically maintain the deformation state of the flexible clamping ear after clamping by means of the inclined sliding groove and inclined wedge surface on the pull rod, without relying on additional external force to maintain it, thereby effectively avoiding the clamping instability caused by reverse slippage or loosening, improving the structural reliability and measurement consistency during the testing process, and ensuring the validity of the test data. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the surface structure of the positioning disk assembly according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of a toothed guide rod and a drive tooth transmission structure according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of a threaded toothed sprocket and toothed guide rod transmission structure according to an embodiment of the present invention;

[0035] Figure 5 This is a partial cross-sectional structural diagram of the positioning disk assembly according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the toothed guide rod, pull rod, and sliding assembly structure according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the surface structure of a leaf root clamping component according to an embodiment of the present invention.

[0038] Figure label:

[0039] 100. Positioning plate assembly; 110. Turntable base; 111. Guide ear; 120. Threaded toothed sprocket; 130. Toothed guide rod; 140. Pulling rod; 150. Sliding assembly; 121. Bevel tooth; 122. Thread; 141. Linkage plate; 142. Inclined slide groove; 143. Inclined wedge surface; 151. Sliding guide block; 152. Pulley;

[0040] 200. Leaf root clamping component; 210. Fixed plate part; 220. Elastic ear part; 230. Leaf root clamping ear; 231. Connecting ear;

[0041] 300, drive gear; 400, hex wrench. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0043] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0044] The following describes, with reference to the accompanying drawings, some embodiments of a turbine blade simulation assembly measuring tool provided by the present invention.

[0045] Combination Figures 1-7 As shown, the present invention provides a turbine blade simulation assembly measuring tool, comprising a positioning disk assembly 100, a blade root clamping component 200, and several drive teeth 300 rotatably mounted inside the positioning disk assembly 100. Its structure and working process are as follows:

[0046] In this embodiment, the positioning disk assembly 100 is the main support structure of the present invention, used to form the mounting and transmission base for each leaf root clamping component. The positioning disk assembly 100 includes a turntable base 110, a threaded toothed disk 120, a toothed guide rod 130, a pull rod 140, and a sliding assembly 150. A plurality of guide ears 111 are fixedly installed on the outer periphery of the turntable base 110, and each guide ear 111 is evenly distributed along the circumferential direction to guide the pull rod 140 to slide radially. The threaded toothed disk 120 is rotatably mounted on the inner side of the positioning disk assembly 100, forming an annular rotating base. One side of the threaded toothed disk 120 is provided with bevel teeth 121 that mesh with the surface of the drive teeth 300, and the other side is provided with threads 122. The threads 122 mesh with the outer surfaces of the plurality of toothed guide rods 130 to convert the rotational motion of the drive teeth 300 into the radial sliding motion of the toothed guide rods 130.

[0047] Several toothed guide rods 130 are evenly distributed along the circumference of the turntable base 110. The inner side of the turntable base 110 is provided with through holes for guiding the toothed guide rods 130 to slide radially. The outer end of the toothed guide rod 130 is fixedly connected to the pull rod 140, and its front end is provided with a linkage plate 141. The linkage plate 141 is used to transmit radial thrust to drive the blade root clamping member 200 to clamp.

[0048] In this embodiment, the pull rod 140 is slidably mounted on the surface of the guide ear 111 and arranged radially. The surface of the pull rod 140 is provided with an inclined groove 142 and an inclined wedge surface 143, wherein the inclined groove 142 is symmetrically arranged on both sides of the pull rod 140 and is parallel to the inclined wedge surface 143. The sliding sleeve 150 is slidably sleeved on the outer surface of the pull rod 140, and its inner side is provided with a sliding guide block 151 and a pulley 152 that slidably abut against the inclined groove 142 and the inclined wedge surface 143, respectively.

[0049] As the toothed guide rod 130 moves radially, the linkage plate 141 pushes the pull rod 140 to slide synchronously. The inclined slide groove 142 and the inclined wedge surface 143 drive the sliding assembly 150 to slide inward or outward, realizing the clamping or releasing action. The pulley 152 and the inclined wedge surface 143 make contact and roll to reduce friction and ensure smooth operation.

[0050] In this embodiment, the blade root clamping member 200 is installed on the outer periphery of the turntable base 110 to simulate clamping the blade root of the steam turbine.

[0051] The blade root clamping member 200 includes a fixed plate portion 210, an elastic ear portion 220, and blade root clamping ears 230. The blade root clamping ears 230 are arranged symmetrically in a V-shape. Connecting ears 231 are fixedly installed on the surfaces of the two blade root clamping ears 230, and are movably connected to the end of the sliding assembly 150 through the connecting ears 231, thereby converting the displacement of the sliding assembly 150 into the clamping motion of the blade root clamping ears 230.

[0052] The fixed plate 210, the elastic ear 220, and the blade root clamping ear 230 can be integrally molded. The fixed plate 210 and the elastic ear 220 are elastic, which can provide buffering and compensation during clamping. The blade root clamping ear 230 has toothed ridges on its surface that are adapted to the shape of the turbine blade root, which is used to enhance the clamping friction and achieve high-precision positioning for simulated assembly.

[0053] In this embodiment, a plurality of drive teeth 300 are evenly distributed on the inner side of the turntable seat 110, and their outer sides are provided with bevel teeth 121 that mesh with the threaded toothed disc 120. The drive teeth 300 cooperate with the hexagonal wrench 400 through the internal hexagonal hole structure, which can realize manual or mechanical torque input.

[0054] When the drive gear 300 rotates, it drives the threaded tooth disc 120 to rotate, thereby driving the tooth guide rod 130 to move radially forward and backward. The tooth guide rod 130 drives the pull rod 140 to slide through the linkage plate 141, and transmits the motion to the sliding assembly 150 through the wedge structure. Finally, it drives the blade root clamp 230 to clamp or release the turbine blade root through the connecting lug 231, thereby achieving synchronous clamping control.

[0055] Working principle and usage process of this invention:

[0056] When simulating blade assembly, the operator first fixes the measuring tool on the assembly platform to ensure that the positioning disk assembly 100 is in a horizontal and stable state. Several blade root clamping components 200 distributed along the circumference constitute the circumferential assembly simulation channel for the blade root. Each blade root clamping component can be adjusted individually or synchronously to adapt to the blade root dimensions of different specifications.

[0057] During operation, a hex wrench 400 is inserted into the hexagonal hole of the drive tooth 300 located on the outer periphery of the measuring tool. By rotating the drive tooth 300, the threaded sprocket 120 that meshes with it is driven to rotate. The bevel teeth 121 on the threaded sprocket 120 mesh with the drive tooth 300 to achieve transmission. At the same time, the threads 122 on the surface of the threaded sprocket mesh with several tooth guides 130, causing the tooth guides to move forward and backward in the radial direction.

[0058] The toothed guide rod 130 is fixedly connected to the linkage plate 141 at its front end, which drives the pull rod 140 to slide along the guide lug 111. When the toothed guide rod moves inward, the linkage plate pushes the pull rod to tighten. The inclined sliding groove 142 and the inclined wedge surface 143 provided on its surface will form a guiding sliding engagement with the sliding guide block 151 and pulley 152 on the inner side of the sliding assembly 150, thereby causing the sliding assembly 150 to retract inward.

[0059] One end of the sliding assembly 150 is movably connected to the connecting lug 231 on the blade root clamping member 200. When the sliding assembly is retracted, the blade root clamping lug 230 of the blade root clamping member moves in a V-shape synchronous clamping motion. The toothed edges on its surface cooperate with the blade root of the turbine blade to form a simulated clamping and positioning effect on the blade root.

[0060] Clamping and adjustment process:

[0061] Initial positioning: Insert the blade root of the turbine blade between the two blade root clamps 230 so that the blade root and the tooth edge are engaged.

[0062] Synchronous clamping: The operator uses a hex wrench 400 to rotate any one of the drive teeth 300. Since each drive tooth meshes with the threaded tooth plate 120, multiple tooth guide rods 130 will slide simultaneously in the radial direction, realizing the synchronous clamping of all clamping parts, so that the blade root is evenly stressed and forms a stable fixation.

[0063] Precision adjustment: The rotation angle of each drive tooth can be finely adjusted according to the blade model or assembly gap requirements to achieve precise control of clamping force and assembly gap; the elastic ear 220 provides micro-elastic compensation, making blade root clamping smoother and automatically eliminating gaps.

[0064] Release and disassembly: Rotate the drive gear 300 counterclockwise, which drives the threaded tooth plate 120 to rotate in the opposite direction, causing the tooth guide rod 130 to move radially outward, which drives the pull rod 140 to open, the sliding part 150 to move outward accordingly, and the blade root clamp 230 to open, thereby realizing the automatic release of the blade root.

[0065] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A turbine blade simulation assembly measuring tool, characterized in that, The device includes a positioning disk assembly (100), a blade root clamping component (200), and several drive teeth (300) rotatably mounted inside the positioning disk assembly (100). The positioning disk assembly (100) includes a turntable base (110), a threaded toothed disc (120), a toothed guide rod (130), a pull rod (140), and a sliding component (150). Several guide ears (111) are fixedly mounted on the outer periphery of the turntable base (110). The blade root clamping component (200) is detachably mounted on the outer periphery of the turntable base (110). The pull rod (140) is slidably mounted on the surface of the guide ear (111) and is arranged opposite to each other on both sides of the blade root clamping component (200). One end of each pull rod (140) is provided with a linkage plate (141) and is fixedly connected to the surface of the toothed guide rod (130). The sliding component (150) is slidably sleeved on the outer surface of the pull rod (140). The surface of the pull rod (140) is provided with a slanted groove (142) and a slanted wedge surface (143). The inner side of the sliding assembly (150) is provided with a sliding guide block (151) and a pulley (152) that slide against the slanted groove (142) and the slanted wedge surface (143) respectively. The slanted wedge surface (143) of the surface of the pull rod (140) is slanted, and the width of the pull rod (140) gradually decreases along the radial direction of the turntable seat (110). The pulley (152) slides against the surface of the slanted wedge surface (143). The blade root clamping member (200) includes a fixed plate (210), an elastic lug (220), and a blade root clamping lug (230); the blade root clamping lug (230) is arranged in a V-shape symmetrically and is used to clamp the blade root of the turbine blade. The surfaces of the two blade root clamping lugs (230) are fixedly mounted with connecting lugs (231) and are movably connected to the end of the sliding assembly (150) through the connecting lugs (231); The fixed plate (210), the elastic ear (220) and the blade root clamp (230) are integrally formed structures. The fixed plate (210) and the elastic ear (220) are elastic and are used to guide the blade root clamp (230) to clamp the root of the turbine blade. The surface of the blade root clamp (230) is provided with toothed ridges that are compatible with the root of the turbine blade.

2. The turbine blade simulation assembly measuring tool according to claim 1, characterized in that, The number of leaf root clamps (200) is several and evenly distributed on the outer periphery of the turntable seat (110), and several guide ears (111) are symmetrically arranged on both sides of the leaf root clamps (200) to guide the sliding of the pull rod (140).

3. The turbine blade simulation assembly measuring tool according to claim 1, characterized in that, A plurality of the toothed guide rods (130) are evenly distributed along the circumferential direction of the turntable seat (110), and the inner side of the turntable seat (110) is provided with through holes for guiding the toothed guide rods (130) to slide radially.

4. The turbine blade simulation assembly measuring tool according to claim 1, characterized in that, One end of the sliding component (150) passes through the surface of the elastic ear (220) and is movably connected to the connecting ear (231). The surface of the guide ear (111) is provided with a through hole for the sliding component (150) to pass through, so as to guide the sliding component (150) to slide in a direction perpendicular to the surface of the guide ear (111) and the pull rod (140).

5. The turbine blade simulation assembly measuring tool according to claim 1, characterized in that, The threaded toothed disc (120) is rotatably mounted on the inner side of the positioning disc assembly (100), and one side of it is provided with a bevel tooth (121) that meshes with the surface of the drive tooth (300); one side of the threaded toothed disc (120) is provided with a thread (122) that meshes with the surface of the tooth guide rod (130).

6. The turbine blade simulation assembly measuring tool according to claim 1, characterized in that, A number of the drive teeth (300) are evenly distributed along the inner circumferential direction of the turntable seat (110) and mesh with the surface of the threaded toothed disc (120) for transmission. One side of the drive teeth (300) is provided with an internal hexagonal hole for rotation control by a hexagonal wrench (400).

7. The turbine blade simulation assembly measuring tool according to claim 1, characterized in that, The inclined slide groove (142) is symmetrically arranged on both sides of the pull rod (140) and is set parallel to the inclined wedge surface (143). The sliding guide block (151) is slidably sleeved on the inner side of the inclined slide groove (142).

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