An emergency treatment device for steam turbine blade maintenance

Abstract

The utility model belongs to steam turbine maintenance equipment technical field, we propose a kind of steam turbine blade maintenance emergency handling device, including fixed subassembly and brake subassembly, fixed subassembly is provided with mounting plate in brake subassembly bottom, and mounting plate is used to support and install component;Fixed subassembly includes multiple limit wedge, and limit groove for accommodating steam turbine blade is opened in limit wedge;The side of fixed subassembly is provided with brake subassembly, and brake subassembly includes displacement drive motor, mounting bracket and electromagnetic brake turntable, and the position of mounting plate close to mounting bracket is symmetrically provided with sliding slot, and the bottom of mounting bracket is symmetrically provided with sliding foot, and sliding foot is inserted in sliding slot;Brake subassembly adopts power-off brake type electromagnetic brake, friction plate separates when electrified, and contact disc can rotate freely;When power off, spring pushes friction plate and compresses, and contact disc and impeller rotating shaft are locked instantly, brake responds quickly, and force is even, avoid the problem that traditional mechanical braking skids unevenly.

Description

Technical Field

[0001] This utility model relates to the technical field of steam turbine maintenance equipment, specifically to an emergency treatment device for steam turbine blade maintenance. Background Technology

[0002] As a core power equipment in the power and energy sectors, steam turbine blades operate under complex conditions of high temperature, high pressure, and high-speed rotation for extended periods. This makes them prone to wear, corrosion, and fatigue cracks, necessitating maintenance. The core requirements for blade maintenance are precise positioning and stable locking. If the blades or impellers shift or rotate during maintenance, it can not only lead to inaccuracies in welding, grinding, and flaw detection processes, but also cause safety accidents such as blade impact damage and tool collisions with the impeller, potentially affecting the stability of the turbine's subsequent operation. However, existing fixing devices still have some drawbacks, such as: Different models of steam turbines have different impeller diameters and shaft positions. Existing braking devices are mostly fixed installation structures, which cannot flexibly adjust the position of the braking components according to the impeller size. As a result, a set of devices can only be used to repair blades of a single model of steam turbine, resulting in poor versatility. If different specifications of blades need to be repaired, the entire set of fixtures must be replaced or the worktable must be readjusted, which is cumbersome, greatly extends the preparation time for maintenance, and reduces the efficiency of operation.

[0003] Therefore, we propose an emergency repair device for steam turbine blades. Utility Model Content

[0004] The purpose of this invention is to provide an emergency repair device for steam turbine blades to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an emergency treatment device for turbine blade maintenance, comprising a fixing component and a braking component, wherein the fixing component and the braking component are provided with mounting plates at their bottoms, the mounting plates being used to support and install the components; the fixing component includes multiple limiting wedges, wherein the limiting wedges are provided with limiting grooves for accommodating turbine blades; A braking assembly is provided on one side of the fixed assembly. The braking assembly includes a displacement drive motor, a mounting bracket, and an electromagnetic braking disc. The mounting plate has symmetrical sliding grooves near the mounting bracket. Sliding feet are symmetrically installed at the bottom of the mounting bracket and are inserted into the sliding grooves. An electromagnetic braking disc is installed on the top of the mounting bracket.

[0006] Preferably, a displacement drive motor is installed on the outer side of the mounting frame, and a drive screw is installed on the transmission end of the displacement drive motor. The drive screw is screwed to the lower part of the mounting frame, and the rotation of the drive screw drives the mounting frame to achieve displacement.

[0007] Preferably, a contact disc is rotatably mounted on the electromagnetic brake disc near the limiting wedge block. The end face of the contact disc is provided with a high-friction contact surface for contacting the turbine impeller shaft. The turbine impeller is braked by the limiting of the electromagnetic brake disc, and the electromagnetic brake disc moves synchronously with the mounting frame.

[0008] Preferably, the contact disc adopts a dual-disc linkage structure, with the side closer to the limit wedge being the active contact disc and the other side being the driven brake disc connected to the friction pads of the electromagnetic brake disc.

[0009] Preferably, a 3mm thick silicon carbide wear-resistant layer is pasted on the end face of the active contact plate, and a spiral heat dissipation groove is formed on the surface of the wear-resistant layer.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This device uses multiple sets of limiting wedges with dedicated limiting grooves to form a fixing component, which can form a wrapping constraint on the blade, ensuring that the blade is always in the preset maintenance position, greatly improving maintenance indicators such as welding accuracy and crack repair flatness, and avoiding maintenance rework caused by blade displacement.

[0011] The braking assembly adopts a power-off braking type electromagnetic brake. When energized, the friction pads separate, and the contact disc can rotate freely (for easy adjustment and alignment with the impeller shaft). When de-energized, the spring pushes the friction pads to press tightly, instantly locking the contact disc and the impeller shaft. The braking response is rapid and the force is uniform, avoiding the problem of uneven force slippage in traditional mechanical brakes.

[0012] This device achieves precise displacement adjustment of the braking components through a combination of a displacement drive motor, a drive screw, and a sliding groove. The displacement drive motor rotates the drive screw, converting the rotational motion into linear motion of the mounting frame (and electromagnetic brake turntable). The mounting frame moves smoothly along the sliding groove, allowing for flexible adjustment of the alignment between the contact plate and the impeller according to the impeller diameter and shaft position of different turbine models. Without the need to change fixtures or adjust the worktable, one device can be adapted to the maintenance of various turbine blade specifications, offering strong versatility, significantly shortening maintenance preparation time, and improving operational efficiency. Attached Figure Description

[0013] Figure 1 This is a front view of the present utility model; Figure 2 This is a side view of the present invention.

[0014] In the diagram: 1. Mounting plate, 2. Fixing component, 3. Limiting wedge, 4. Displacement drive motor, 5. Mounting bracket, 6. Electromagnetic brake turntable, 7. Contact plate. Detailed Implementation

[0015] 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.

[0016] 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. Example 1

[0017] Please see Figure 1-2 The present invention provides the following technical solution: An emergency repair device for steam turbine blades includes a fixing component 2 and a braking component; the fixing component 2 and the braking component are provided with a mounting plate 1 at their bottom, the mounting plate 1 is used to support and install the components, and can be fixed on the workbench; The fixing component 2 includes multiple limiting wedges 3, and the limiting wedges 3 are provided with limiting grooves for accommodating turbine blades; a braking component is provided on one side of the fixing component 2, which includes a displacement drive motor 4, a mounting bracket 5 and an electromagnetic brake turntable 6. The mounting plate 1 is provided with symmetrical sliding grooves near the mounting bracket 5, and sliding feet are symmetrically installed at the bottom end of the mounting bracket 5, and the sliding feet are inserted into the sliding grooves. A displacement drive motor 4 is installed on the outside of the mounting bracket 5. A drive screw is installed on the transmission end of the displacement drive motor 4 and the drive screw is screwed to the lower part of the mounting bracket 5. When the drive screw rotates, it drives the mounting bracket 5 to achieve displacement. An electromagnetic brake turntable 6 is mounted on the top of the mounting bracket 5. A contact plate 7 is rotatably mounted on the electromagnetic brake turntable 6 near the limit wedge block 3. The end face of the contact plate 7 is provided with a high-friction contact surface for contacting the turbine impeller shaft. The turbine impeller is fixed by the limiting brake of the electromagnetic brake turntable 6 to prevent shaking. The electromagnetic brake turntable 6 moves synchronously with the mounting bracket 5, which can achieve flexible adjustment.

[0018] The electromagnetic brake disc 6 uses a power-off braking type electromagnetic brake with built-in friction pads. When energized, the electromagnetic coil is attracted, the friction pads are separated, and the contact disc 7 can rotate freely. When de-energized, the spring pushes the friction pads to press them together, realizing emergency braking of the contact disc and ensuring rapid locking of the impeller in case of emergencies. The contact disc 7 adopts a dual-disc linkage structure. The side closest to the limit wedge block 3 is the active contact disc, and the other side is the driven brake disc, which is connected to the friction pad of the electromagnetic brake disc. A 3mm thick silicon carbide wear-resistant layer is pasted on the end face of the active contact disc. Spiral heat dissipation grooves are opened on the surface of the wear-resistant layer, which can increase the friction with the impeller shaft and reduce the friction temperature rise during braking through the heat dissipation grooves.

[0019] Working principle: In practical use, this scheme can be equipped with two sets of symmetrical braking components to clamp the inner turbine shaft and maintain stability. The function of the fixing component is to directly hold the turbine blade to be repaired, preventing the blade from shifting during the repair process. The fixing component includes multiple limiting wedges, each of which has a limiting groove inside that matches the shape of the turbine blade. During repair, the blade to be repaired is embedded in the limiting groove. Through the wrapping constraint of the limiting groove, the displacement of the blade in the vertical and horizontal directions (such as swaying or shifting) is restricted, ensuring that the blade is always in the precise position required for repair. The braking assembly is used to lock the impeller shaft and start the displacement drive motor. The motor drive end drives the drive screw to rotate. Since the drive screw is screwed to the lower part of the mounting bracket, the rotational motion of the drive screw is converted into the linear motion of the mounting bracket, which ultimately drives the electromagnetic brake disc to move synchronously until the contact disc is aligned with the impeller shaft. The active contact disc (which directly contacts the shaft) is located on one side near the impeller, while the driven brake disc (which is connected to the friction pads of the electromagnetic brake disc) is located on the other side. This ensures that the braking force of the friction pads can be effectively transmitted to the active contact disc. A 3mm thick silicon carbide wear-resistant layer (silicon carbide has high hardness and a high coefficient of friction) is pasted on the end face of the active contact disc, which increases the friction with the shaft (to prevent slippage) and extends the service life of the contact disc. Spiral heat dissipation grooves are opened on the surface of the wear-resistant layer. The heat generated by friction during braking can be quickly dissipated through the heat dissipation grooves, avoiding the failure of the friction pad or damage to the contact surface due to high temperature.

[0020] 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.

[0021] 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. An emergency repair device for steam turbine blades, comprising a fixing component (2) and a braking component, characterized in that: The fixing component (2) and the braking component are provided with a mounting plate (1) at the bottom. The mounting plate (1) is used to support and install the components. The fixing component (2) includes multiple limiting wedges (3). The limiting wedges (3) are provided with limiting grooves for accommodating turbine blades. A braking assembly is provided on one side of the fixed assembly (2). The braking assembly includes a displacement drive motor (4), a mounting bracket (5), and an electromagnetic braking turntable (6). A sliding groove is symmetrically opened on the mounting plate (1) near the mounting bracket (5). Sliding feet are symmetrically installed at the bottom of the mounting bracket (5) and are inserted into the sliding groove. An electromagnetic braking turntable (6) is installed on the top of the mounting bracket (5).

2. The emergency repair device for steam turbine blades according to claim 1, characterized in that: A displacement drive motor (4) is installed on the outside of the mounting bracket (5). A drive screw is installed on the transmission end of the displacement drive motor (4), and the drive screw is screwed to the lower part of the mounting bracket (5). When the drive screw rotates, it drives the mounting bracket (5) to achieve displacement.

3. The emergency repair device for steam turbine blades according to claim 1, characterized in that: The electromagnetic brake turntable (6) is rotatably mounted with a contact plate (7) near the limit wedge (3). The end face of the contact plate (7) is provided with a high-friction contact surface for contacting the turbine impeller shaft. The turbine impeller is braked by the electromagnetic brake turntable (6), and the electromagnetic brake turntable (6) moves synchronously with the mounting frame (5).

4. The emergency repair device for steam turbine blades according to claim 1, characterized in that: The contact disc (7) adopts a dual-disc linkage structure. The side closest to the limit wedge (3) is the active contact disc, and the other side is the driven brake disc, which is connected to the friction plate of the electromagnetic brake disc (6).

5. The emergency repair device for steam turbine blades according to claim 1, characterized in that: A 3mm thick silicon carbide wear-resistant layer is pasted on the end face of the active contact plate, and a spiral heat dissipation groove is opened on the surface of the wear-resistant layer.

Images