A turbine rotor blade assembly stop fixture

Abstract

This utility model belongs to the technical field of steam turbine assembly equipment. We propose a stop tooling for steam turbine rotor blade assembly, including two symmetrically arranged mounting platforms and a bridge frame. The bridge frame is installed between the two mounting platforms, and a three-jaw chuck is installed on the opposite sides of the two mounting platforms. Jaws are movably arranged on the three-jaw chuck, and a secondary support device is arranged in the middle of the three-jaw chuck. The secondary support device includes an air guide column and a support head. The support head is set on the air guide column, and the air guide column is fixed on the mounting platform. The support head and the air guide column are interconnected, and the air guide column is connected to an air supply source. Top plugs are arranged radially on the support head. This solution uses the three-jaw chuck to clamp from the outer periphery, and the secondary support device to press from the shaft center, forming a double fixing mode of "outer clamp + inner push". The jaws on the outer periphery ensure that the rotor does not shake, while the top plugs at the shaft center restrict the radial movement and axial displacement of the rotor, which is especially suitable for scenarios that require high-precision alignment during blade assembly.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine assembly equipment technology, specifically a steam turbine rotor blade assembly stop tool. Background Technology

[0002] In the assembly process of steam turbine rotor blades, the stable fixation of the rotor is the core link to ensure assembly accuracy and operational safety. As a high-speed rotating component, the outer surface of the steam turbine rotor needs to be fitted with multiple sets of blades. During assembly, it is necessary to ensure that the rotor axis is strictly aligned with the assembly datum, and the rotor cannot experience radial movement or circumferential rotation. Otherwise, it will lead to deviations in blade installation position, excessive clearance, and even serious problems such as vibration and wear during subsequent operation.

[0003] However, the traditional single peripheral clamping method has the following shortcomings:

[0004] 1) Insufficient stability: For rotors with long lengths or large diameters, relying solely on peripheral clamping can easily lead to slight deformation or wobbling in the middle part of the rotor due to insufficient rigidity. This may cause rotor displacement, especially when axial or radial forces are applied during blade assembly.

[0005] 2) Insufficient shaft positioning accuracy: The outer peripheral clamping mainly relies on the fit between the jaws and the outer circle. If there are machining errors such as ellipticity in the outer circle of the rotor, it is easy to cause the shaft centerline to deviate, affecting the concentricity requirements of the blade assembly.

[0006] Therefore, there is an urgent need for a stop tool that can combine peripheral clamping and shaft support, has a buffer function, and is highly adaptable, in order to meet the high precision and high stability requirements of turbine rotor blade assembly. Utility Model Content

[0007] The purpose of this utility model is to provide a stop tool for assembling steam turbine rotor blades to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a turbine rotor blade assembly stop tooling, comprising two symmetrically arranged mounting platforms and a bridge; the bridge is installed between the two mounting platforms, and a three-jaw chuck is installed on the opposite sides of the two mounting platforms, with movably arranged jaws on the three-jaw chuck, and a secondary support device is provided in the middle of the three-jaw chuck.

[0009] The secondary support device includes an air guide column and a support head. The support head is set on the air guide column, which is fixed on the mounting platform. The support head and the air guide column are interconnected, and the air guide column is connected to an air supply source. Top plugs are arranged radially on the support head, and adjustment holes are evenly opened on the support head. The top plugs are movably inserted into the adjustment holes.

[0010] Preferably, the support head has two layers, an inner and an outer layer. The inner layer has a closed structure and valves are installed near the top plug. When the valves are opened, the top plug is pushed outward.

[0011] Preferably, the inner end of the top plug is provided with a telescopic column, and a buffer base is sleeved on the telescopic column. The buffer base consists of two sealing rubber pads and a buffer spring, with the sealing rubber pads located at both ends of the buffer spring.

[0012] Preferably, when the top plug is subjected to gas pressure, it is pushed outward and abuts against the shaft of the turbine rotor to achieve secondary locking and fixation. The buffer base provides a certain buffer for the top plug, so that the top plug can withstand more rigid forces.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This solution uses a three-jaw chuck to clamp the rotor from the outer periphery, while a secondary support device presses it from the shaft center, forming a dual fixing mode of "outer clamp + inner push". The outer periphery chuck ensures that the rotor does not wobble, while the shaft center plug restricts the rotor's radial movement and axial displacement, making it particularly suitable for scenarios where high-precision alignment is required during blade assembly.

[0015] The design of the buffer base allows the top plug to have a certain amount of elastic adjustment space when subjected to rigid force, avoiding rotor deformation due to excessive clamping, while improving the tooling's adaptability to rotors of different specifications.

[0016] The secondary support device is driven by a gas source, and the gas pressure can be flexibly adjusted by the gas supply source. The valve controls the ejection and retraction of the top plug. It is simple to operate and responds quickly, and can quickly complete the secondary locking or loosening action, improving assembly efficiency. At the same time, the connection design between the air guide column and the support head ensures that the gas pressure is transmitted evenly, so that each top plug moves synchronously and ensures the symmetry of the shaft positioning. Attached Figure Description

[0017] Figure 1 This is the front view of the present utility model;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 This is a schematic diagram of the support head of this utility model;

[0020] Figure 4 This is a cross-sectional view of the support head of this utility model.

[0021] In the diagram: 1. Mounting platform, 2. Cable tray, 3. Three-jaw chuck, 4. Jaw, 5. Secondary support device, 6. Air guide column, 7. Support head, 8. Top plug, 9. Adjustment hole, 10. Buffer base, 11. Valve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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, they should not be construed as limitations on this utility model.

[0024] Example:

[0025] Please see Figure 1-4 The present invention provides the following technical solution:

[0026] A turbine rotor blade assembly stop tooling includes two symmetrically arranged mounting platforms 1 and a bridge frame 2;

[0027] The cable tray 2 is installed between two mounting platforms 1. A three-jaw chuck 3 is installed on the opposite side of the two mounting platforms 1. Jaws 4 are movably arranged on the three-jaw chuck 3. A secondary support device 5 is arranged in the middle of the three-jaw chuck 3.

[0028] The secondary support device 5 includes an air guide column 6 and a support head 7. The support head 7 is mounted on the air guide column 6, and the air guide column 6 is fixed on the mounting platform 1. The support head 7 and the air guide column 6 are interconnected, and the air guide column 6 is connected to an air supply source.

[0029] The support head 7 is provided with top plugs 8 radially arranged, and the support head 7 is provided with evenly spaced adjustment holes 9, and the top plugs 8 are movably inserted into the adjustment holes 9;

[0030] The support head 7 has two layers, inner and outer. The inner layer has a closed structure and valves 11 are installed near the top plug 8. When the valves 11 are opened, they push the top plug 8 outward.

[0031] The inner end of the top plug 8 is provided with a telescopic column, and a buffer base 10 is sleeved on the telescopic column. The buffer base 10 consists of two sealing rubber pads and a buffer spring, with the sealing rubber pads located at both ends of the buffer spring.

[0032] When the top plug 8 is subjected to gas pressure, it is pushed outward and abuts against the shaft of the turbine rotor to achieve secondary locking and fixation. The buffer base 10 provides a certain buffer for the top plug 8, so that the top plug 8 can withstand more rigid force. Together with the three-jaw chuck 3, it can achieve a more stable clamping function.

[0033] Working principle:

[0034] The tooling forms a stable frame through two symmetrical mounting platforms 1 and the bridge 2 connecting them. It mainly relies on the three-jaw chuck 3 to achieve the initial clamping of the turbine rotor: the jaws 4 on the three-jaw chuck 3 can move synchronously to apply clamping force from the outer periphery of the rotor, complete the basic positioning and fixation, and ensure that the rotor will not shift in a large range during the assembly process.

[0035] Based on the initial clamping by the three-jaw chuck 3, the secondary support device 5 provides additional fixation from the rotor shaft center to further improve stability. The air guide column 6 of the secondary support device is connected to the air supply source, and the gas enters the support head 7 through the air guide column 6 to provide power for the subsequent action of the top plug 8.

[0036] The support head 7 has a two-layer structure, with the inner layer being a closed structure. A valve 11 is located near the top plug 8. When air is supplied, the gas pressure in the inner layer increases, the valve 11 opens, and the gas pressure acts on the inner end of the top plug 8.

[0037] The top plug 8 is movably inserted into the adjustment hole 9 of the support head. Under gas pressure, it is pushed outward. Since the top plug 8 is radially distributed, multiple top plugs 8 will abut against the shaft of the turbine rotor from different directions, forming a "ring-like" locking of the inner ring of the rotor, thus achieving secondary locking and fixing.

[0038] A buffer base 10 is fitted onto the telescopic post at the inner end of the top plug 8, which consists of two sealing rubber pads and a buffer spring in the middle:

[0039] When the top plug 8 comes into contact with the rotor shaft, the buffer spring can absorb part of the rigid impact force and prevent damage caused by hard contact between the top plug 8 and the rotor.

[0040] The sealing rubber gasket ensures the effective transmission of gas pressure while enhancing the buffering effect, enabling the top plug 8 to withstand greater rigid forces.

[0041] The working principle of the three-jaw chuck 3: When the chuck wrench is turned (or driven by a power source), the wrench drives the small bevel gear inside the chuck to rotate, and the small bevel gear then meshes with and drives the large bevel gear (also known as the "bevel gear") perpendicular to it. The back of the large bevel gear is machined with a flat thread (similar to the Archimedean spiral), and the bottom of the three jaws is equipped with a rack that matches the flat thread;

[0042] When the large bevel gear rotates, the flat thread on its back pushes the three jaws to move synchronously along the radial direction of the chuck (either contracting towards the center simultaneously or opening outwards simultaneously). This design ensures that the movement of the three jaws is completely consistent, thereby achieving automatic centering of the workpiece—that is, regardless of whether the outer circle of the workpiece is regular, the three jaws will apply clamping force evenly from three symmetrical directions, so that the axis of the workpiece is automatically aligned with the rotation center of the chuck (or tooling datum);

[0043] The chuck is driven to retract towards the center by rotating the wrench until it is tightly fitted against the outer circumference of the workpiece. The workpiece is then fixed in place by the friction and clamping force between the chuck and the workpiece. Because the three chucks are symmetrically distributed at 120°, the clamping force is evenly applied to the outer circumference of the workpiece, effectively preventing radial movement or circumferential rotation of the workpiece during processing or assembly.

[0044] It should be noted that all standard parts used in this utility model can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. It should be noted that the electrical components mentioned in this utility model have been sorted according to the actual situation during manufacturing, so that the wire harness will not cause the wire harness to become tangled or affect the operation. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0045] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be considered as limiting the scope of the claims.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A turbine rotor blade assembly stop tool comprising two symmetrically arranged mounting tables (1) and a bridge (2), characterized in that: The cable tray (2) is installed between two mounting platforms (1). A three-jaw chuck (3) is installed on the opposite side of the two mounting platforms (1). A chuck (4) is movably installed on the three-jaw chuck (3). A secondary support device (5) is installed in the middle of the three-jaw chuck (3). The secondary support device (5) includes an air guide column (6) and a support head (7). The support head (7) is set on the air guide column (6), and the air guide column (6) is fixed on the mounting platform (1). The support head (7) and the air guide column (6) are interconnected, and the air guide column (6) is connected to the air supply source. The support head (7) is provided with top plugs (8) in a radial pattern. The support head (7) is provided with adjustment holes (9) evenly distributed, and the top plugs (8) are movably inserted into the adjustment holes (9).

2. A turbine rotor blade assembly stop tool according to claim 1, characterised in that: The support head (7) has two layers, an inner and an outer layer. The inner layer has a closed structure and valves (11) are installed near the top plug (8). When the valves (11) are opened, they push the top plug (8) outward.

3. A turbine rotor blade assembly stop tool according to claim 2, characterised in that: The top plug (8) has a telescopic column at its inner end, and a buffer base (10) is sleeved on the telescopic column. The buffer base (10) consists of two sealing rubber pads and a buffer spring. The sealing rubber pads are located at both ends of the buffer spring.

4. A turbine rotor blade assembly stop tool as claimed in claim 3, wherein: When the top plug (8) is subjected to gas pressure, it is pushed outward and abuts against the shaft of the turbine rotor to achieve secondary locking and fixation. The buffer base (10) provides a certain buffer for the top plug (8), so that the top plug (8) can withstand more rigid forces.

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