Hydraulic turbine collector ring on-line repair device and method

Abstract

This invention provides an online repair device and method for turbine slip rings. Two auxiliary frames are hinged to both sides of the main frame structure. The main and auxiliary frames are fixed to the carbon brush holder of the turbine slip ring via edge grooves. A lead screw lifting mechanism is fixed inside the main frame, and a telescopic electric cylinder equipped with an additive manufacturing welding head is fixed to the platform. A rotatable connecting rod is installed in the left auxiliary frame, with a motor mounted below the end of the connecting rod and a rubber wheel mounted above the end of the connecting rod. A grinding platform is installed in the right auxiliary frame, fixed to the auxiliary frame by a pin. The grinding platform structure is similar to that of the left auxiliary frame, with a grinding wheel mounted on the connecting rod. The left frame drives the turbine slip ring to rotate, working in conjunction with the additive manufacturing equipment in the main frame to achieve the metal film preparation process. The right auxiliary frame performs grinding on the metal film. This device can adapt to turbine slip rings of different sizes, enabling online repair of turbine slip rings.

Description

Technical Field

[0001] This invention relates to the field of turbine slip ring maintenance, specifically to an online repair device and method for turbine slip rings. Background Technology

[0002] The carbon brush-turbine slip ring system in a hydro-generator is a crucial component for introducing excitation current into the excitation winding. During long-term operation, due to mechanical friction, electrical spark erosion, and environmental oxidation, its surface is prone to defects such as wear, pitting, and oxide film thickening. This leads to increased contact resistance and abnormal temperature rise, and in severe cases, equipment shutdown or even safety accidents. The frequency and number of defects in the carbon brush-turbine slip ring system are far higher than in other equipment. Traditional maintenance methods require shutdown and disassembly of the turbine slip rings, using manual grinding, cleaning, or replacement, which has the following drawbacks: High repair costs: For hydro-generators, downtime for maintenance can lead to significant economic losses; Low repair precision: Manual polishing is difficult to guarantee surface flatness and electrical uniformity, and is prone to causing secondary damage; Poor adaptability: Existing semi-automatic repair equipment is mostly designed for specific models and is difficult to be compatible with different sizes or complex working conditions.

[0003] At this point, equipment is needed to perform online repairs on the turbine slip rings, allowing maintenance without disassembling the slip rings and carbon brush holders. Furthermore, this equipment needs to be adaptable and compatible with slip rings of different sizes. Summary of the Invention

[0004] The purpose of this invention is to provide a method for online repair of turbine slip rings. This device consists of three hinged frames, suitable for turbine slip rings of different sizes. The central frame is equipped with an automatic additive welding system that can prepare a metal film on the surface of the turbine slip ring. The right sub-frame is equipped with a grinding system that can grind the prepared metal film. The structural design of this device enables it to perform online repair of turbine slip rings.

[0005] To achieve the aforementioned technical features, the present invention aims to provide an online repair device for a turbine collector ring, comprising a main frame structure for supporting the entire device; a left sub-frame and a right sub-frame hinged to both sides of the main frame structure; a screw lifting mechanism fixed within the main frame structure for lifting the working platform; a telescopic electric cylinder equipped with an additive manufacturing welding head fixed to the working platform; a rotatable first connecting rod hinged within the left sub-frame, a second motor mounted below the end of the first connecting rod, a rubber wheel mounted above the end of the first connecting rod, and the rubber wheel connected to the shaft of the second motor; a grinding platform mounted within the right sub-frame, fixed to the right sub-frame by a first positioning pin and a second positioning pin, a second connecting rod hinged to the grinding platform, a grinding wheel mounted at the other end of the second connecting rod, and the grinding wheel connected to the shaft of a third motor.

[0006] Preferably, the main frame structure includes a frame body, which is generally arc-shaped with grooves at the edges for fixing to the turbine collector ring carbon brush holder. Hinge holes are provided on the left and right sides of the frame body for hinged connection of the left and right sub-frame bodies. A protruding part is offset in the middle of the outer arc between the two ends of the frame body for installing the screw lifting mechanism. A circular hole is provided at the top of the main frame structure for connecting the first motor to the transmission screw.

[0007] Preferably, the lead screw lifting mechanism includes a first motor fixed to the top of the main frame structure, a transmission lead screw rotatably mounted between lead screw bases via bearings, and five round holes machined at both ends of the lead screw base, two of which are used to assemble linear guide rods and one round hole is used to assemble bearings; the lead screw base is connected to the protruding part of the main frame structure through the remaining two round holes, and the linear guide rods are arranged parallel to both sides of the transmission lead screw.

[0008] Preferably, the internal thread of the working platform and the transmission screw form a screw drive, the working platform and the linear guide rod form a sliding fit, and the working platform is fixed to the telescopic electric cylinder; the telescopic electric cylinder drives the internal screw system through a motor to convert the rotational motion into the linear motion of the piston rod; the additive manufacturing welding head is fixed to the piston rod by bolts.

[0009] Preferably, the left subframe includes a first connecting rod with a hole in the middle. The hole is connected to one end of a first spring, and the other end of the first spring is connected to a first clamp. The first clamp is fixed to a third positioning pin. The third positioning pin is selectively inserted into a first positioning hole group and used to adjust the tension of the first spring. The first positioning hole group is set on the bottom plate of the left subframe.

[0010] Preferably, the right subframe includes parallel guide columns, a grinding platform is slidably mounted on the guide columns via sleeves, and a third positioning hole group is machined at corresponding heights on the two guide columns. The sleeves on the two guide columns are selectively positioned and mounted on the third positioning hole group via a first positioning pin and a second positioning pin, respectively.

[0011] Preferably, a second connecting rod is hinged to the guide post of the second positioning pin. The second connecting rod has a hole in the middle, which is connected to one end of a second spring. The other end of the second spring is connected to a second clamp. The second clamp is fixed to a fourth positioning pin. The fourth positioning pin is selectively inserted into a second positioning hole group and used to adjust the tension of the second spring. The second positioning hole group is machined on a grinding platform. A third motor is fixed to the bottom end of the second connecting rod, and the output shaft of the third motor is connected to a grinding wheel.

[0012] Preferably, the side of the main frame structure that is hinged to the left sub-frame and the right sub-frame is respectively machined with an edge groove, and the left sub-frame is hinged to the edge groove of the main frame structure by a first hinge bolt and a third hinge bolt arranged in pairs; the right sub-frame is hinged to the edge groove of the main frame structure by a second hinge bolt and a fourth hinge bolt arranged in pairs.

[0013] Preferably, another aspect of the present invention provides an online repair method for a turbine slip ring, wherein the repair method is implemented using the online repair equipment for the turbine slip ring, and includes the following steps: Step 1: Adjust the equipment's hinged position to align with the turbine's collector ring carbon brush holder. When it is necessary to repair the turbine collector ring, after ensuring the working conditions, first adjust the hinge posture of the main frame structure, the left auxiliary frame and the right auxiliary frame so that the three frames are fixed on the turbine collector ring carbon brush frame respectively. Step 2, mate the rubber wheel with the turbine slip ring: After the three frames are fixed, rotate the first connecting rod to make the rubber wheel tangent to the turbine collector ring, and adjust the tension of the first spring on the first connecting rod by adjusting the position of the third positioning pin in the first positioning hole group to ensure that the rubber wheel can smoothly drive the turbine collector ring to rotate. Step 3, Preparation of the metal film: After the rubber wheel is adjusted, the second motor under the first connecting rod is started. The rubber wheel drives the turbine slip ring to rotate. The movement of the additive manufacturing welding head is controlled by the screw lifting mechanism and the telescopic electric cylinder to bring the welding head to the appropriate welding position. The rubber wheel drives the turbine slip ring to rotate, and the additive manufacturing welding head starts to work. The nozzle guides the protective gas to ensure that the welding area is isolated from the air. The conductive nozzle guides the welding wire to be accurately fed into the molten pool so that the welding wire can be fully melted in the molten pool. As the additive manufacturing welding head moves relative to the surface of the turbine slip ring, a coating is formed on the surface of the turbine slip ring. The additive manufacturing welding head is moved by the screw lifting mechanism and the telescopic electric cylinder. The above process is repeated many times to completely cover the contact surface of the turbine slip ring with a metal coating. Step 4, Polishing the metal film: After the metal film is applied, the additive manufacturing welding head is returned to a safe position, the second motor is paused, the turbine slip ring stops rotating, and the grinding platform is adjusted. The second connecting rod is rotated to make the grinding wheel tangent to the surface of the turbine slip ring. The position of the fourth positioning pin in the second positioning hole group is adjusted to regulate the tension of the second spring on the second connecting rod, ensuring normal contact between the grinding wheel and the metal film surface. The third motor is started to drive the grinding wheel to rotate, and the second motor is started to drive the turbine slip ring to rotate. The grinding wheel can grind the metal film on the entire circumference of the turbine slip ring surface. After grinding is completed, the position of the first and second positioning pins on the third positioning hole group is used to control the raising and lowering of the grinding platform. The above grinding process is repeated until all the metal film on the surface of the turbine slip ring is ground.

[0014] Preferably, during operation, the lifting and lowering of the work platform is controlled by the screw lifting structure, and the extension and retraction of the piston rod and the additive manufacturing welding head are controlled by the telescopic electric cylinder 107, thereby moving the additive manufacturing welding head to a suitable welding position. The rotation of the rubber wheel is controlled by the second motor, thereby realizing the rotation of the turbine collector ring.

[0015] The present invention has the following beneficial effects: 1. The equipment of this invention adopts a three-section frame hinged structure, which can adapt well to different sizes of turbine collector rings within a certain range. Compared with existing equipment, it has stronger adaptability, and its structural design enables it to perform turbine collector ring repair work.

[0016] 2. The turbine slip ring repair process of this equipment does not require the removal of the turbine slip ring. This is especially important for large turbine slip rings, as disassembly is cumbersome and difficult, resulting in high labor and time costs. Online repair of the turbine slip rings reduces the economic cost of replacement and maintenance.

[0017] 3. This equipment can cover the contact surface of the turbine slip ring with a wear-resistant metal film, which enhances the stability and reliability of the turbine excitation system.

[0018] 4. The additive manufacturing welding head structure of the present invention can be replaced and substituted, and can be replaced by other working ends, thus developing more metal film preparation methods.

[0019] 5. Through the combination of the aforementioned screw lifting mechanism and telescopic electric cylinder structure, the additive manufacturing welding head can have high flexibility and can work on turbine slip rings of different sizes.

[0020] 6. By using a spring to tension the grinding wheel, the grinding force can be adjusted and remains constant during the grinding process, resulting in higher efficiency and precision compared to traditional manual grinding. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a three-dimensional view from the first perspective of the present invention.

[0023] Figure 2 This is a three-dimensional view from the second perspective of the present invention.

[0024] Figure 3 This is a three-dimensional view from the third perspective of the present invention.

[0025] Figure 4 This is the front view of the present invention.

[0026] Figure 5 This is a top view of the present invention.

[0027] Figure 6 This is a three-dimensional view of the main frame of the present invention.

[0028] Figure 7 For the present invention Figure 6 Enlarged view of part A in the middle.

[0029] Figure 8 This is a structural diagram of the left subframe of the present invention.

[0030] Figure 9 This is a structural diagram of the right-side subframe of the present invention.

[0031] In the diagram: 1. Main frame structure; 2. Left sub-frame structure; 3. Right sub-frame structure; 4. Turbine collector ring carbon brush holder; 5. Turbine collector ring; 6. First hinge bolt; 7. Second hinge bolt; 8. Third hinge bolt; 9. Fourth hinge bolt; 10. First positioning pin; 11. Second positioning pin. First motor 101, lead screw base 102, worktable 103, bearing 104, transmission lead screw 105, linear guide rod 106, telescopic electric cylinder 107, piston rod 108, additive manufacturing welding head 109; First connecting rod 201, second motor 202, rubber wheel 203, first spring 204, first clamp 205, third positioning pin 206, first positioning hole group 207; Grinding platform 301, second connecting rod 302, third motor 303, grinding wheel 304, second spring 305, second clamp 306, fourth positioning pin 307, second positioning hole group 308, third positioning hole group 309. Detailed Implementation

[0032] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0033] Example 1: Reference Figure 1-9 A turbine collector ring online repair device includes a main frame structure 1 for supporting the entire device; a left sub-frame 2 and a right sub-frame 3 are hinged to both sides of the main frame structure 1; a screw lifting mechanism is fixed inside the main frame structure 1 for lifting a working platform 103; a telescopic electric cylinder 107 equipped with an additive manufacturing welding head 109 is fixed to the working platform 103; a rotatable first connecting rod 201 is hinged inside the left sub-frame 2, and a [missing information - likely a device name] is installed below the end of the first connecting rod 201. The second motor 202 has a rubber wheel 203 mounted above the end of the first connecting rod 202, which is connected to the shaft of the second motor 202. A grinding platform 301 is mounted inside the right sub-frame 3, and is fixed to the right sub-frame 3 by a first positioning pin 10 and a second positioning pin 11. A second connecting rod 302 is hinged to the grinding platform 301, and a grinding wheel 304 is mounted at the other end of the second connecting rod 302, which is connected to the shaft of the third motor 303. Through this installation structure, the left sub-frame 2 and the right sub-frame 3 are fixed to the turbine collector ring carbon brush holder 4 via edge grooves. The left subframe 2 and right subframe 3 can be adapted to different sizes of turbine collector ring carbon brush holders by adjusting their hinged posture; a screw lifting mechanism is fixed in the main frame, which is driven by motor 101 to rotate the shaft and realize the up and down movement of the worktable 103; the telescopic electric cylinder 107 equipped with additive manufacturing welding head 109 is fixed on the platform.

[0034] Furthermore, the main frame structure 1 includes a frame body, which is generally arc-shaped with grooves at the edges for fixing to the turbine collector ring carbon brush holder 4. Hinge holes are opened on the left and right sides of the frame body for hinged connection of the left sub-frame body 2 and the right sub-frame body 3. A protruding part is offset in the middle of the outer arc between the two ends of the frame body for installing the screw lifting mechanism. A round hole is opened at the top section of the main frame structure 1 for connecting the first motor 101 to the transmission screw 105.

[0035] Furthermore, the lead screw lifting mechanism includes a first motor 101 fixed to the top of the main frame structure 1, and a transmission lead screw 105 rotatably mounted between lead screw bases 102 via bearings 104. Each end of the lead screw base 102 has five circular holes, two for mounting linear guide rods 106 and one for mounting the bearing 104. The lead screw base 102 is connected to the protruding part of the main frame structure 1 via the remaining two circular holes. The linear guide rods 106 are arranged parallel to both sides of the transmission lead screw 105. Through the aforementioned lead screw lifting mechanism, the worktable 103 can be moved up and down, thereby adjusting the height of the worktable 103.

[0036] Furthermore, the internal thread of the working platform 103 and the transmission screw 105 constitute a screw drive, the working platform 103 and the linear guide rod 106 form a sliding fit, and the working platform 103 is fixed to the telescopic electric cylinder 107; the telescopic electric cylinder 107 drives the internal screw system through a motor, converting the rotational motion into the linear motion of the piston rod 108; the additive manufacturing welding head 109 is fixed to the piston rod 108 by bolts. With the above structure, during operation, the internal thread of the working platform 103 matches the transmission screw 105. When the screw rotates, the working platform moves along the screw axis due to the thread engagement. The telescopic electric cylinder 107 drives the piston rod 108 to extend and retract, thereby displacing the additive manufacturing welding head 109.

[0037] Furthermore, the left subframe 2 includes a first connecting rod 201 with a hole in the middle. One end of the hole is connected to a first spring 204, and the other end of the first spring 204 is connected to a first clamp 205. The first clamp 205 is fixed to a third positioning pin 206. The third positioning pin 206 is selectively inserted into a first positioning hole group 207 and used to adjust the tension of the first spring 204. The first positioning hole group 207 is located on the base plate of the left subframe 2. This structure allows for adjustment of the pressure between the rubber wheel 203 and the turbine collector ring 5, ensuring sufficient friction to drive the rotation of the turbine collector ring 5. During operation, by starting the second motor 202 under the first connecting rod 201, the rubber wheel 203 drives the turbine collector ring 5 to rotate.

[0038] Furthermore, the right-side subframe 3 includes parallel guide columns. A grinding platform 301 is slidably mounted on the guide columns via sleeves. A third positioning hole group 309 is machined at corresponding heights on the two guide columns. The sleeves on the two guide columns are selectively positioned on the third positioning hole group 309 via a first positioning pin 10 and a second positioning pin 11. These guide columns ensure that the grinding platform 301 can be height-adjusted as needed, thus adapting to grinding requirements at different heights.

[0039] Furthermore, a second connecting rod 302 is hinged to the guide post located on the second positioning pin 11. A hole is formed in the middle of the second connecting rod 302, and this hole is connected to one end of a second spring 305. The other end of the second spring 305 is connected to a second clamp 306, which is fixed to a fourth positioning pin 307. The fourth positioning pin 307 is selectively inserted into a second positioning hole group 308 and used to adjust the tension of the second spring 305. The second positioning hole group 308 is machined on a grinding platform 301. A third motor 303 is fixed to the bottom end of the second connecting rod 302, and the output shaft of the third motor 303 is connected to a grinding wheel 304. The second spring 305 can be used to adjust the contact force between the grinding wheel 304 and the turbine slip ring 5, thereby ensuring the grinding effect.

[0040] Furthermore, the main frame structure 1 is hinged to the left sub-frame 2 and the right sub-frame 3 on one side, respectively, with edge grooves. The left sub-frame 2 is hinged to the edge groove of the main frame structure 1 by a pair of first hinge bolts 6 and third hinge bolts 8 arranged vertically. The right sub-frame 3 is hinged to the edge groove of the main frame structure 1 by a pair of second hinge bolts 7 and fourth hinge bolts 9 arranged vertically. This installation structure ensures that the posture of the main frame structure 1, the left sub-frame 2, and the right sub-frame 3 can be adjusted to adapt to the shape and structure of the turbine collector ring carbon brush holder 4.

[0041] Example 2: Another aspect of the present invention provides an online repair method for a turbine slip ring, wherein the repair method is implemented using the aforementioned online repair equipment for turbine slip rings, and includes the following steps: Step 1: Adjust the articulated position of the equipment and align it with the turbine collector ring carbon brush holder 4. When it is necessary to repair the turbine collector ring 5, after ensuring the working conditions, first adjust the hinge posture of the three frames, namely the main frame structure 1, the left auxiliary frame 2 and the right auxiliary frame 3, so that the three frames are respectively fixed on the turbine collector ring carbon brush frame 4. Step 2, the rubber wheel 203 mates with the turbine collector ring 5: After the three frames are fixed, rotate the first connecting rod 201 to make the rubber wheel 203 tangent to the turbine collector ring 5, and adjust the tension of the first spring 204 on the first connecting rod by adjusting the position of the third positioning pin 206 in the first positioning hole group 207 to ensure that the rubber wheel 203 can smoothly drive the turbine collector ring 5 to rotate. Step 3, Preparation of the metal film: After the rubber wheel 203 is adjusted, the second motor 202 under the first connecting rod 201 is started. The rubber wheel 203 drives the turbine collector ring 5 to rotate. The movement of the additive manufacturing welding head 109 is controlled by the screw lifting mechanism and the telescopic electric cylinder 107, so that the welding head reaches the appropriate welding position. The rubber wheel drives the turbine collector ring to rotate, and the additive manufacturing welding head starts to work. The nozzle guides the protective gas to ensure that the welding area is isolated from the air. The conductive nozzle guides the welding wire to be accurately fed into the molten pool, so that the welding wire is fully melted in the molten pool. As the additive manufacturing welding head moves relative to the surface of the turbine collector ring, a coating is formed on the surface of the turbine collector ring 5. The additive manufacturing welding head is moved by the screw lifting mechanism and the telescopic electric cylinder. The above process is repeated many times to achieve complete coverage of the contact surface of the turbine collector ring with a metal coating. Step 4, Polishing the metal film: After the metal film is covered, the additive manufacturing welding head is returned to a safe position, the second motor 202 is paused, the turbine slip ring 5 stops rotating, and the grinding platform 301 is adjusted. The second connecting rod 302 is rotated so that the grinding wheel 304 is tangent to the surface of the turbine slip ring 5. The position of the fourth positioning pin 307 in the second positioning hole group 308 is adjusted to adjust the tension of the second spring 305 on the second connecting rod 302, ensuring normal contact between the grinding wheel 304 and the surface of the metal film. The third motor 303 is started to drive the grinding wheel to rotate, and the second motor 202 is started to drive the rubber wheel to rotate the turbine slip ring. The grinding wheel can grind the metal film on the entire circumference of the surface of the turbine slip ring. After grinding is completed, the position of the first positioning pin 10 and the second positioning pin 11 on the third positioning hole group 309 is used to control the raising and lowering of the grinding platform 301. The above grinding process is repeated until all the metal film on the surface of the turbine slip ring is ground.

[0042] Furthermore, during the operation, the lifting and lowering of the work platform 103 is controlled by the screw lifting structure, and the extension and retraction of the piston rod 108 and the additive manufacturing welding head 109 are controlled by the telescopic electric cylinder 107, thereby moving the additive manufacturing welding head to a suitable welding position. The rotation of the rubber wheel 203 is controlled by the second motor 202, thereby rotating the turbine collector ring 5.

[0043] The specific working principle of this invention: The structural diagram of this equipment is as follows: Figure 1As shown, the additive manufacturing process of the turbine collector ring surface requires the main frame structure 1 and the left auxiliary frame 2 to work together. The second motor 202 drives the rubber wheel 203 to achieve the active rotation of the turbine collector ring 5. The first motor 101, in conjunction with the screw lifting mechanism, controls the vertical positioning of the working platform 103, forming a three-dimensional motion coordination with the rotation system. When the drive motor of the telescopic cylinder 107 is working, it pushes the piston rod 108 forward. When the additive manufacturing welding head 109 reaches a suitable welding position near the contact surface of the turbine collector ring, it stops. The additive manufacturing welding head begins to work. The nozzle guides the protective gas to ensure that the welding area is isolated from the air, and the conductive nozzle guides the welding wire to be precisely fed into the molten pool, allowing the welding wire to fully melt in the molten pool. As the additive manufacturing welding head moves relative to the surface of the turbine collector ring, a coating is formed on the surface of the turbine collector ring 5. The screw lifting mechanism and the telescopic cylinder 107 drive the additive manufacturing welding head to move, and the above process is repeated multiple times until the contact surface of the turbine collector ring is completely covered by a metal coating.

[0044] After the metal film covering is completed, the additive manufacturing welding head 109 is returned to a safe position, and surface treatment is performed using a grinding wheel 304. The tension is adjusted by adjusting the position of the fourth positioning pin 307. The tension of the second spring 305 is adjusted by adjusting the position of the fourth pin 307 in the positioning hole group 308, ensuring the stability of the contact between the grinding wheel and the turbine slip ring. The third motor 206 is started to drive the grinding wheel, while the second motor 202 rotates the turbine slip ring. This continuous grinding ensures a constant rotation speed of the turbine slip ring 5, preventing excessive wear or uneven grinding.

[0045] After grinding, the grinding platform 301 is raised and lowered by the first positioning pin 10 and the second positioning pin 11 at the position of the third positioning hole group 309. The grinding process is repeated to finally complete the grinding of all the metal films on the surface of the turbine collector ring, so that the contact surface of the turbine collector ring meets the surface roughness requirements.

Claims

1. An online repair device for turbine slip rings, characterized in that: The system includes a main frame structure (1) for supporting the entire equipment; a left sub-frame (2) and a right sub-frame (3) are hinged to both sides of the main frame structure (1); a screw lifting mechanism is fixed inside the main frame structure (1) for lifting the work platform (103); a telescopic electric cylinder (107) equipped with an additive manufacturing welding head (109) is fixed on the work platform (103); a first connecting rod (201) that can rotate is hinged inside the left sub-frame (2); a second motor (202) is installed below the end of the first connecting rod (201); a rubber wheel (203) is installed above the end of the first connecting rod (201); and the rubber wheel (203) is connected to the shaft of the second motor (202). A grinding platform (301) is installed inside the right sub-frame (3). The grinding platform (301) is fixed inside the right sub-frame (3) by the first positioning pin (10) and the second positioning pin (11). A second connecting rod (302) is hinged on the grinding platform (301). A grinding wheel (304) is installed at the other end of the second connecting rod (302). The grinding wheel (304) is connected to the shaft of the third motor (303). The main frame structure (1) includes a frame, which is arc-shaped with grooves at the edges for fixing to the turbine collector ring carbon brush holder (4). The frame has hinge holes on the left and right sides for hinged connection to the left sub-frame (2) and the right sub-frame (3). A protruding part is offset in the middle of the outer arc between the two ends of the frame for installing the screw lifting mechanism. The top section of the main frame structure (1) has a round hole for connecting the first motor (101) to the transmission screw (105). The left subframe (2) includes a first connecting rod (201), with a hole in the middle of the first connecting rod (201). The hole is connected to one end of a first spring (204), and the other end of the first spring (204) is connected to a first clamp (205). The first clamp (205) is fixed on a third positioning pin (206). The third positioning pin (206) is selectively inserted into a first positioning hole group (207) and used to adjust the tension of the first spring (204). The first positioning hole group (207) is set on the bottom plate of the left subframe (2). The right subframe (3) includes parallel guide columns, on which a grinding platform (301) is slidably mounted via sleeves. The two guide columns are respectively machined with a third positioning hole group (309) at corresponding heights. The sleeves on the two guide columns are selectively positioned on the third positioning hole group (309) via a first positioning pin (10) and a second positioning pin (11). A second connecting rod (302) is hinged to the guide post of the second positioning pin (11). The second connecting rod (302) has a hole in the middle, which is connected to one end of the second spring (305). The other end of the second spring (305) is connected to the second clamp (306). The second clamp (306) is fixed on the fourth positioning pin (307). The fourth positioning pin (307) is selectively inserted into the second positioning hole group (308) and used to adjust the tension of the second spring (305). The second positioning hole group (308) is machined on the grinding platform (301). The third motor (303) is fixed to the bottom end of the second connecting rod (302), and the output shaft of the third motor (303) is connected to the grinding wheel (304).

2. The online repair equipment for turbine collector rings according to claim 1, characterized in that: The screw lifting mechanism includes a first motor (101) fixed on the top of the main frame structure (1), and a transmission screw (105) rotatably mounted between screw bases (102) via bearings (104). Each end of the screw base (102) has five round holes, two of which are used to assemble linear guide rods (106) and one round hole is used to assemble bearings (104). The screw base (102) is connected to the protruding part of the main frame structure (1) through the remaining two round holes, and the linear guide rods (106) are arranged parallel to both sides of the transmission screw (105).

3. The online repair equipment for turbine collector rings according to claim 2, characterized in that: The internal thread of the working platform (103) and the transmission screw (105) constitute a screw drive. The working platform (103) and the linear guide rod (106) form a sliding fit. The working platform (103) and the telescopic electric cylinder (107) are fixed. The telescopic electric cylinder (107) drives the internal screw system through a motor to convert the rotational motion into the linear motion of the piston rod (108). The additive manufacturing welding head (109) is fixed to the piston rod (108) by bolts.

4. The online repair equipment for turbine slip rings according to claim 3, characterized in that: The main frame structure (1) is hinged to the left sub-frame (2) and the right sub-frame (3) respectively, and edge grooves are processed on the side. The left sub-frame (2) is hinged to the edge groove of the main frame structure (1) by the first hinge bolt (6) and the third hinge bolt (8) arranged in pairs. The right sub-frame (3) is hinged to the edge groove of the main frame structure (1) by the second hinge bolt (7) and the fourth hinge bolt (9) arranged in pairs.

5. A method for online repair of slip rings in a water turbine, characterized in that, The repair method is implemented using the online repair equipment for the turbine collector ring as described in claim 4, and includes the following steps: Step 1: Adjust the articulated posture of the equipment and align it with the turbine collector ring carbon brush holder (4): When it is necessary to repair the turbine collector ring (5), after ensuring the working conditions, first adjust the hinge posture of the three frames (1), left auxiliary frame (2) and right auxiliary frame (3) so that the three frames are fixed on the turbine collector ring carbon brush frame (4). Step 2, the rubber wheel (203) is fitted with the turbine collector ring (5): After the three frames are fixed, rotate the first connecting rod (201) to make the rubber wheel (203) tangent to the turbine collector ring (5), and adjust the tension of the first spring (204) on the first connecting rod by adjusting the position of the third positioning pin (206) in the first positioning hole group (207) to ensure that the rubber wheel (203) can smoothly drive the turbine collector ring (5) to rotate. Step 3, Preparation of the metal film: After the rubber wheel (203) is adjusted, the second motor (202) under the first connecting rod (201) is started. The rubber wheel (203) drives the turbine collector ring (5) to rotate. The movement of the additive manufacturing welding head (109) is controlled by the screw lifting mechanism and the telescopic electric cylinder (107) so that the welding head reaches the appropriate welding position. The rubber wheel drives the turbine collector ring to rotate, and the additive manufacturing welding head starts to work. The nozzle guides the protective gas to ensure that the welding area is isolated from the air. The conductive nozzle guides the welding wire to be accurately fed into the molten pool so that the welding wire is fully melted in the molten pool. As the additive manufacturing welding head moves relative to the surface of the turbine collector ring, a coating is formed on the surface of the turbine collector ring (5). The additive manufacturing welding head is moved by the screw lifting mechanism and the telescopic electric cylinder. The above process is repeated many times to achieve complete coverage of the contact surface of the turbine collector ring with a metal coating. Step 4, Polishing the metal film: After the metal film is covered, control the additive manufacturing welding head to return to the safe position, pause the second motor (202), stop the turbine slip ring (5) from rotating, start adjusting the grinding platform (301), rotate the second connecting rod (302) to make the grinding wheel (304) tangent to the surface of the turbine slip ring (5), adjust the position of the fourth positioning pin (307) in the second positioning hole group (308) to adjust the tension of the second spring (305) on the second connecting rod (302), and ensure that the grinding wheel (304) and the metal film are properly aligned. Normal surface contact; start the third motor (303) to drive the grinding wheel to rotate, start the second motor (202) to drive the rubber wheel to rotate the turbine collector ring, the grinding wheel can grind the metal film on the entire circumference of the turbine collector ring surface; after grinding is completed, the position of the first positioning pin (10) and the second positioning pin (11) on the third positioning hole group (309) is used to control the lifting and lowering of the grinding platform (301), and the above grinding process is repeated to finally complete the grinding of all the metal film on the surface of the turbine collector ring.

6. The method for online repair of a turbine collector ring according to claim 5, characterized in that, During operation, the lifting and lowering of the work platform (103) is controlled by the screw lifting mechanism, and the extension and retraction of the piston rod (108) and the additive manufacturing welding head (109) are controlled by the telescopic electric cylinder (107), thereby moving the additive manufacturing welding head to a suitable welding position. The rotation of the rubber wheel (203) is controlled by the second motor (202), thereby rotating the turbine collector ring (5).

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