Online repairing equipment and method for collecting ring of water turbine

Abstract

The invention provides online repairing equipment and method for a water turbine collecting ring, two auxiliary frame bodies are hinged to the two sides of a main frame body structure, and the main / auxiliary frame bodies are fixed to a water turbine collecting ring carbon brush holder through edge grooves. A lead screw lifting mechanism is fixed in the main frame body, and a telescopic electric cylinder provided with an additive manufacturing welding head is fixed on the platform; a rotatable connecting rod is mounted in the left auxiliary frame body, a motor is mounted below the tail end of the connecting rod, and a rubber wheel is assembled above the tail end of the connecting rod; a grinding platform is assembled in the right auxiliary frame body and fixed in the auxiliary frame body through a bolt, the structure of the grinding platform is similar to that of the left auxiliary frame body, and a grinding wheel is assembled on a connecting rod; the left side frame body drives a water turbine collecting ring to rotate and is combined with additive manufacturing equipment in the main frame body to achieve the metal film preparation process, and the right side auxiliary frame body achieves grinding of a metal film. The equipment can adapt to water turbine collecting rings of different sizes, and online repairing of the water turbine collecting rings is achieved.

Description

Technical Field

[0001] The present invention relates to the field of maintenance of hydroturbine slip rings, and particularly to an on-line repair device and method for hydroturbine slip rings. Background Art

[0002] In a hydrogenerator, the carbon brush - hydroturbine slip ring device is an important component for introducing the excitation current into the excitation winding. During long-term operation, due to factors such as mechanical friction, electric spark erosion, and environmental oxidation, defects such as surface wear, pits, and thickening of the oxide film are likely to occur on its surface, resulting in an increase in contact resistance and abnormal temperature rise. In severe cases, it may cause equipment shutdown or even safety accidents. The number and frequency of defects in the carbon brush - hydroturbine slip ring system are much higher than those of other equipment. The traditional maintenance method requires shutdown maintenance and disassembly of the hydroturbine slip ring, and manual grinding, cleaning, or replacement of new parts is adopted, which has the following defects: High repair cost: For a hydrogenerator, shutdown maintenance will cause significant economic losses; Low repair accuracy: Manual grinding operation is difficult to ensure the surface flatness and electrical conductivity uniformity, and is prone to cause secondary damage; Poor adaptability: Most of the existing semi-automatic repair devices are designed for specific models and are difficult to be compatible with different sizes or complex working conditions.

[0003] At this time, a device capable of on-line repair of hydroturbine slip rings is needed to maintain the hydroturbine slip ring without disassembling the hydroturbine slip ring and the carbon brush holder. And this device needs to have a certain adaptability and be compatible with hydroturbine slip rings of different sizes. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for on-line repair of hydroturbine slip rings. This device is composed of three articulated frames and is applicable to hydroturbine slip rings of different sizes. Its central frame is equipped with an automatic additive welding system, which can prepare a metal film on the surface of the hydroturbine slip ring, and the right side auxiliary frame is equipped with a grinding system to grind the prepared metal film; the structural design of this device enables it to perform the on-line repair task of hydroturbine slip rings.

[0005] To achieve the above technical features, the object of the present invention is achieved as follows: An on-line repair device for a hydroturbine collector ring includes a main frame structure for carrying the entire device; a left-side sub-frame and a right-side sub-frame are hinged on both sides of the main frame structure; a screw-lifting mechanism is fixed inside the main frame structure and is used for lifting the working platform; a telescopic electric cylinder equipped with an additive manufacturing welding head is fixed on the working platform; a rotatable first connecting rod is hinged inside the left-side sub-frame, a second motor is installed below the end of the first connecting rod, a rubber wheel is assembled above the end of the first connecting rod, and the rubber wheel is connected to the rotating shaft of the second motor; a grinding platform is assembled inside the right-side sub-frame, the grinding platform is fixed inside the right-side sub-frame through a first positioning pin and a second positioning pin, a second connecting rod is hinged on the grinding platform, a grinding wheel is assembled at the other end of the second connecting rod, and the grinding wheel is connected to the rotating shaft of the third motor.

[0006] Preferably, the main frame structure includes a frame body, the frame body is in an arc shape as a whole, grooves are opened at the edges for fixing with the carbon brush holder of the hydroturbine collector ring, hinge holes are opened on the left and right sides of the frame body for hinging the left-side sub-frame and the right-side sub-frame, 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, and a round hole is opened at the top section of the main frame structure for connecting the drive screw by the first motor.

[0007] Preferably, the screw-lifting mechanism includes a first motor fixed at the top of the main frame structure, the drive screw is rotatably installed between the screw bases through bearings, five round holes are machined at both ends of the screw bases, two of the round holes are used for assembling linear guide rods, and one round hole is used for assembling bearings; the screw bases are connected to the protruding part of the main frame structure through the remaining two round holes, and the linear guide rods are arranged in parallel on both sides of the drive screw.

[0008] Preferably, the internal thread of the working platform and the drive screw form a screw drive, the working platform and the linear guide rods 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-side sub-frame includes a first connecting rod, a hole is provided in the middle of the first connecting rod, one end of a first spring is connected to the hole, the other end of the first spring is connected to a first fixture, the first fixture is fixed on a third positioning pin, the third positioning pin is selectively inserted into a first positioning hole group and is used for adjusting the tension of the first spring, and the first positioning hole group is arranged on the bottom plate of the left-side sub-frame.

[0010] Preferably, the right auxiliary frame body includes guide columns arranged in parallel. A grinding platform is slidably mounted on the guide columns through sleeves. Third positioning hole groups are respectively machined on the two guide columns at corresponding heights. The sleeves on the two guide columns are selectively positioned and mounted on the third positioning hole groups through a first positioning pin and a second positioning pin respectively.

[0011] Preferably, a second connecting rod is hinged to the guide column where the second positioning pin is located. A hole is formed in the middle of the second connecting rod. One end of a second spring is connected to the hole, and the other end of the second spring is connected to a second fixture. The second fixture is fixed on a fourth positioning pin. The fourth positioning pin is selectively inserted into the second positioning hole group and is used to adjust the tension force of the second spring. The second positioning hole group is machined on the grinding platform. The third motor is fixed to the bottom of the end of the second connecting rod, and the output shaft of the third motor is connected to a grinding wheel.

[0012] Preferably, on the sides where the main frame body structure is hinged to the left auxiliary frame body and the right auxiliary frame body respectively, edge grooves are machined. The left auxiliary frame body is hinged to the position where the edge groove of the main frame body structure is located through a pair of upper and lower first hinge bolts and third hinge bolts; the right auxiliary frame body is hinged to the position where the edge groove of the main frame body structure is located through a pair of upper and lower second hinge bolts and fourth hinge bolts.

[0013] Preferably, on the other hand, the present invention provides a method for on-line repair of a hydro-turbine collector ring. The repair method is realized by using the on-line repair equipment for the hydro-turbine collector ring, and includes the following steps: Step 1, adjusting the articulated posture of the equipment to dock with the carbon brush holder of the hydro-turbine collector ring: When it is necessary to repair the hydro-turbine collector ring, after ensuring the working conditions, first, by adjusting the articulated postures of the three frame bodies of the main frame body structure, the left auxiliary frame body and the right auxiliary frame body, the three frame bodies are respectively fixed on the carbon brush holder of the hydro-turbine collector ring; Step 2, matching the rubber wheel with the hydro-turbine collector ring: After the three frame bodies are fixed, rotate the first connecting rod to make the rubber wheel tangent to the hydro-turbine collector ring, and adjust the tension force 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 hydro-turbine collector ring to rotate; Step 3, preparation of the metal film: After the rubber wheel is adjusted, start the second motor under the first connecting rod. The rubber wheel drives the hydroturbine collector ring to rotate. Control the movement of the additive manufacturing welding head by the lead screw lifting mechanism and the telescopic electric cylinder to make the welding head reach the appropriate welding position. The hydroturbine collector ring is driven to rotate by the rubber wheel, and the additive manufacturing welding head starts to work. The nozzle guides the shielding gas to ensure that the welding area is isolated from the air. The contact tip guides the welding wire to be accurately fed into the molten pool, so that the welding wire melts sufficiently in the molten pool. As the additive manufacturing welding head and the surface of the hydroturbine collector ring move relative to each other, a cladding layer is formed on the surface of the hydroturbine collector ring. The additive manufacturing welding head is driven to move by the lead screw lifting mechanism and the telescopic electric cylinder, and the above process is repeated multiple times to achieve that the contact surface of the hydroturbine collector ring is completely covered by the metal coating. Step 4, grinding of the metal film: After the metal film covering is completed, control the additive manufacturing welding head to return to the safe position, pause the second motor, and the hydroturbine collector ring pauses rotating. Start to adjust the grinding platform. Rotate the second connecting rod to make the grinding wheel tangent to the surface of the hydroturbine collector ring. Adjust the position of the fourth positioning pin in the second positioning hole group to adjust the tension of the second spring on the second connecting rod to ensure normal contact between the grinding wheel and the surface of the metal film. Start the third motor to drive the grinding wheel to rotate, and start the second motor to make the rubber wheel drive the hydroturbine collector ring to rotate. The grinding wheel can grind the metal film on the entire circumference of the surface of the hydroturbine collector ring. After grinding, control the lifting of the grinding platform by the positions of the first positioning pin and the second positioning pin on the third positioning hole group, and repeat the above grinding process to finally complete the grinding of all the metal films on the surface of the hydroturbine collector ring.

[0014] Preferably, during the working process, the lifting of the working platform is controlled by the lead screw lifting structure, and the telescopic movement of the piston rod and the additive manufacturing welding head is controlled by the telescopic electric cylinder 107, so as to move the additive manufacturing welding head to the appropriate welding position. The rotation of the rubber wheel is controlled by the second motor to realize the rotation of the hydroturbine collector ring.

[0015] The present invention has the following beneficial effects: 1. The equipment of the present invention adopts a three-section frame articulated structure, which can well adapt to hydroturbine collector rings of different sizes within a certain range, and has stronger adaptability than the existing equipment. Its structural design enables it to carry out the repair work of hydroturbine collector rings.

[0016] 2. The repair process of the hydroturbine collector ring of this equipment does not require the removal of the hydroturbine collector ring. Especially for large hydroturbine collector rings, the disassembly process is cumbersome and difficult, and the labor cost and time cost are relatively high. Online repair of the hydroturbine collector ring reduces the economic cost required for the replacement and repair of the hydroturbine collector ring.

[0017] 3. This device can cover a wear-resistant metal film on the contact surface of the hydroturbine collector ring, enhancing the stability and reliability of the hydroturbine excitation system.

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

[0019] 5. Through the cooperation of the above-mentioned lead screw lifting mechanism and telescopic electric cylinder structure, the additive manufacturing welding head can have high flexibility and can work on hydroturbine collector rings of different sizes.

[0020] 6. By using a spring to tension the grinding wheel, it can ensure that the grinding force can be adjusted and remains unchanged during the grinding process, with higher efficiency and higher grinding accuracy compared to traditional manual grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

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

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

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

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

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

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

[0028] Figure 7 It is of the present invention Figure 6 Partial enlarged view A in

[0029] Figure 8 It is the structure diagram of the left side auxiliary frame body of the present invention.

[0030] Figure 9 It is the structure diagram of the right side auxiliary frame body of the present invention.

[0031] In the figure: main frame body structure 1, left side auxiliary frame body 2, right side auxiliary frame body 3, hydroturbine collector ring carbon brush holder 4, hydroturbine collector ring 5, first hinge bolt 6, second hinge bolt 7, third hinge bolt 8, fourth hinge bolt 9, first positioning pin 10, second positioning pin 11; The first motor 101, the lead screw base 102, the workbench 103, the bearing 104, the transmission lead screw 105, the linear guide rod 106, the telescopic electric cylinder 107, the piston rod 108, the additive manufacturing welding head 109; The first connecting rod 201, the second motor 202, the rubber wheel 203, the first spring 204, the first fixture 205, the third positioning pin 206, the first positioning hole group 207; The grinding platform 301, the second connecting rod 302, the third motor 303, the grinding wheel 304, the second spring 305, the second fixture 306, the fourth positioning pin 307, the second positioning hole group 308, the third positioning hole group 309. Specific embodiments

[0032] The following further describes the embodiments of the present invention with reference to the accompanying drawings.

[0033] Example 1: Refer to Figures 1-9 , an on-line repair device for a hydro-turbine collector ring, including a main frame structure 1 for carrying the entire device; the left side and the right side of the main frame structure 1 are hinged with a left side sub-frame 2 and a right side sub-frame 3; a lead screw lifting mechanism is fixed inside the main frame structure 1 and is used for the lifting of the work platform 103; the telescopic electric cylinder 107 equipped with the additive manufacturing welding head 109 is fixed on the work platform 103; a rotatable first connecting rod 201 is hinged inside the left side sub-frame 2, a second motor 202 is installed below the end of the first connecting rod 201, a rubber wheel 203 is assembled above the end of the first connecting rod 202, and the rubber wheel 203 is connected to the rotating shaft of the second motor 202; a grinding platform 301 is assembled inside the right side sub-frame 3, the grinding platform 301 is fixed inside the right side sub-frame 3 through the first positioning pin 10 and the second positioning pin 11, a second connecting rod 302 is hinged on the grinding platform 301, the other end of the second connecting rod 302 is assembled with a grinding wheel 304, and the grinding wheel 304 is connected to the rotating shaft of the third motor 303. Through the above installation structure, the left side sub-frame 2 and the right side sub-frame 3 are fixed to the carbon brush holder 4 of the hydro-turbine collector ring through the edge grooves. The left side sub-frame 2 and the right side sub-frame 3 can be adapted to carbon brush holders of different sizes of hydro-turbine collector rings through the articulated attitude adjustment; a lead screw lifting mechanism is fixed inside the main frame, and the motor 101 drives the rotating shaft to rotate to realize the up and down movement of the workbench 103, and the telescopic electric cylinder 107 equipped with the additive manufacturing welding head 109 is fixed on the platform.

[0034] Further, the main frame structure 1 includes a frame. The overall shape of the frame is arc-shaped, and grooves are provided at the edges for fixing with the carbon brush holder 4 of the hydroelectric generator slip ring. Hinge holes are provided on both the left and right sides of the frame for hinging 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 a screw lifting mechanism. A round hole is provided at the top section of the main frame structure 1 for connecting and driving the transmission screw 105 by the first motor 101.

[0035] Further, the screw lifting mechanism includes a first motor 101 fixed to the top of the main frame structure 1. The transmission screw 105 is rotatably installed between the screw bases 102 through bearings 104. Five round holes are machined at both ends of the screw base 102. Two of the round holes are used for assembling the linear guide rods 106, and one round hole is used for assembling the bearing 104. The screw base 102 is connected to the protruding part of the main frame structure 1 through the remaining two round holes. The linear guide rods 106 are arranged in parallel on both sides of the transmission screw 105. Through the above screw lifting mechanism, the up and down movement of the workbench 103 can be realized, and thus the height of the workbench 103 can be adjusted.

[0036] Further, the internal thread of the work platform 103 and the transmission screw 105 form a screw drive. The work platform 103 and the linear guide rods 106 form a sliding fit. The work platform 103 is fixed to the telescopic electric cylinder 107. 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 through bolts. Through the above structure, during the working process, the internal thread of the work platform 103 matches the transmission screw 105. When the screw rotates, the work platform moves along the axis of the screw due to thread engagement. The telescopic electric cylinder 107 drives the piston rod 108 to expand and contract, driving the additive manufacturing welding head 109 to displace.

[0037] Further, the left sub-frame 2 includes a first connecting rod 201. A hole is provided in the middle of the first connecting rod 201. One end of a first spring 204 is connected to the hole, 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 is used to adjust the tension of the first spring 204. The first positioning hole group 207 is provided on the bottom plate of the left sub-frame 2. Through the above structure, the pressing degree between the rubber wheel 203 and the hydroelectric generator slip ring 5 can be adjusted, thus ensuring sufficient frictional force to drive the rotation of the hydroelectric generator slip ring 5. During the working process, by starting the second motor 202 under the first connecting rod 201, the rubber wheel 203 drives the hydroelectric generator slip ring 5 to rotate.

[0038] Further, the right-side auxiliary frame body 3 includes guide columns arranged in parallel. A grinding platform 301 is slidably mounted on the guide columns through sleeves. Third positioning hole groups 309 are 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 groups 309 through a first positioning pin 10 and a second positioning pin 11 respectively. The above-mentioned guide columns ensure that the height of the grinding platform 301 can be adjusted as needed, so as to adapt to grinding requirements at different heights.

[0039] Further, a second connecting rod 302 is hinged to the guide column where the second positioning pin 11 is located. A hole is formed in the middle of the second connecting rod 302. One end of a second spring 305 is connected to the hole, and the other end of the second spring 305 is connected to a second clamp 306. The second clamp 306 is fixed on a fourth positioning pin 307. The fourth positioning pin 307 is selectively inserted into a second positioning hole group 308 and is used to adjust the tension of the second spring 305. The second positioning hole group 308 is machined on the grinding platform 301. A third motor 303 is fixed to the bottom of the end of the second connecting rod 302, and the output shaft of the third motor 303 is connected to a grinding wheel 304. The above-mentioned second spring 305 can be used to adjust the contact force between the grinding wheel 304 and the hydro-generator collector ring 5, so as to ensure the grinding effect.

[0040] Further, edge grooves are respectively machined on one side of the main frame body structure 1 hinged to the left-side auxiliary frame body 2 and the right-side auxiliary frame body 3. The left-side auxiliary frame body 2 is hinged to the position where the edge groove of the main frame body structure 1 is located through a pair of upper and lower first hinge bolts 6 and third hinge bolts 8; the right-side auxiliary frame body 3 is hinged to the position where the edge groove of the main frame body structure 1 is located through a pair of upper and lower second hinge bolts 7 and fourth hinge bolts 9. Through the above installation structure, it is ensured that the postures of the main frame body structure 1, the left-side auxiliary frame body 2 and the right-side auxiliary frame body 3 can be adjusted, so as to adapt to the external shape structure of the hydro-generator collector ring carbon brush holder 4.

[0041] Embodiment 2: On the other hand, the present invention provides a method for on-line repair of a hydro-generator collector ring. The repair method is realized by using the on-line repair equipment for a hydro-generator collector ring, and includes the following steps: Step 1, adjust the articulated posture of the equipment and dock with the hydro-generator collector ring carbon brush holder 4: When it is necessary to repair the hydro-generator collector ring 5, after ensuring the working conditions, first adjust the articulated postures of the three frame bodies of the main frame body structure 1, the left-side auxiliary frame body 2 and the right-side auxiliary frame body 3 so that the three frame bodies are respectively fixed on the hydro-generator collector ring carbon brush holder 4; Step 2, cooperate the rubber wheel 203 with the hydro-generator collector ring 5: After fixing the three frameworks, rotate the first connecting rod 201 to make the rubber wheel 203 tangent to the hydroturbine 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 hydroturbine collector ring 5 to rotate; Step 3, preparation of the metal film: After the adjustment of the rubber wheel 203 is completed, start the second motor 202 under the first connecting rod 201. The rubber wheel 203 drives the hydroturbine collector ring 5 to rotate. Control the movement of the additive manufacturing welding head 109 by controlling the screw rod lifting mechanism and the telescopic electric cylinder 107 to make the welding head reach the appropriate welding position; drive the hydroturbine collector ring to rotate by the rubber wheel, and the additive manufacturing welding head starts to work. The nozzle guides the shielding gas to ensure that the welding area is isolated from the air, and the contact tip guides the welding wire to be accurately fed into the molten pool to fully melt the welding wire in the molten pool. As the additive manufacturing welding head and the surface of the hydroturbine collector ring move relative to each other, a coating is formed on the surface of the hydroturbine collector ring 5. Drive the additive manufacturing welding head to move through the screw rod lifting mechanism and the telescopic electric cylinder, and repeat the above process multiple times to achieve that the contact surface of the hydroturbine collector ring is completely covered by the metal coating; Step 4, grinding of the metal film: After the metal film is completely covered, control the additive manufacturing welding head to return to the safe position, pause the second motor 202, and the hydroturbine collector ring 5 pauses to rotate. Start to adjust the grinding platform 301. Rotate the second connecting rod 302 to make the grinding wheel 304 tangent to the surface of the hydroturbine collector 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 to ensure that the grinding wheel 304 is in normal contact with the surface of the metal film; start the third motor 303 to drive the grinding wheel to rotate, start the second motor 202 to make the rubber wheel drive the hydroturbine collector ring to rotate, and the grinding wheel can grind the metal film on the entire circumference of the surface of the hydroturbine collector ring; after grinding, control the lifting of the grinding platform 301 by the positions of the first positioning pin 10 and the second positioning pin 11 on the third positioning hole group 309, and repeat the above grinding process to finally complete the grinding of all the metal films on the surface of the hydroturbine collector ring.

[0042] Furthermore, during the working process, control the lifting of the working platform 103 through the screw rod lifting structure, control the telescopic movement of the piston rod 108 and the additive manufacturing welding head 109 through the telescopic electric cylinder 107, so as to move the additive manufacturing welding head to the appropriate welding position, and control the rotation of the rubber wheel 203 through the second motor 202 to realize the rotation of the hydroturbine collector ring 5.

[0043] The specific working principle of the present invention: The structural schematic diagram of this equipment is as Figure 1As shown in the figure, the additive manufacturing process of the surface of the hydroturbine collector ring requires the collaborative work of the main frame structure 1 and the left-side auxiliary frame 2. The second motor 202 drives the rubber wheel 203 to achieve the active rotation of the hydroturbine collector ring 5. The first motor 101 is linked to the lead screw lifting mechanism to control 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 works, it pushes the piston rod 108 forward. When the additive manufacturing welding head 109 reaches the appropriate welding position near the contact surface of the hydroturbine collector ring, it stops. The additive manufacturing welding head starts to work. The nozzle guides the shielding gas to ensure that the welding area is isolated from the air. The contact tip 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 and the surface of the hydroturbine collector ring do relative motion, a cladding layer is formed on the surface of the hydroturbine collector ring 5. The additive manufacturing welding head is driven to move by the lead screw lifting mechanism and the telescopic cylinder 107. The above process is repeated multiple times so that the contact surface of the hydroturbine collector ring is completely covered by the metal coating.

[0044] After the metal film covering is completed, control the additive manufacturing welding head 109 to return to the safe position, and use the grinding wheel 304 for surface treatment. Adjust the position of the fourth positioning pin 307 to adjust the tension force. By adjusting the position of the fourth pin 307 in the positioning hole group 308, the tension force of the second spring 305 is adjusted to ensure the stability of the contact between the grinding wheel and the hydroturbine collector ring. Start the third motor 206 to drive the grinding wheel, and at the same time, the second motor 202 rotates the hydroturbine collector ring, so that the grinding is continuous. Ensuring a constant rotation speed of the hydroturbine collector ring 5 can avoid excessive wear or uneven grinding.

[0045] After grinding, control the lifting of the grinding platform 301 through the positions of the first positioning pin 10 and the second positioning pin 11 in the third positioning hole group 309. Repeatedly perform the above grinding process to finally complete the grinding of all the metal films on the surface of the hydroturbine collector ring, so that the contact surface of the hydroturbine collector ring meets the surface roughness requirements.

Claims

1. An online repair device for a turbine collector ring, characterized in that: The invention comprises a main frame structure (1) for carrying the entire device; a left sub-frame (2) and a right sub-frame (3) are hingedly connected on both sides of the main frame structure (1); a screw lifting mechanism is fixed inside the main frame structure (1) and is used for lifting and lowering a working platform (103); a telescopic electric cylinder (107) equipped with an additive manufacturing welding head (109) is fixed on the working platform (103); a first connecting rod (201) capable of rotating is hingedly connected 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 (202); the rubber wheel (203) is connected to the rotating shaft of the second motor (202); A grinding platform (301) is assembled in the right sub-frame (3), and the grinding platform (301) is fixed in the right sub-frame (3) via a first positioning pin (10) and a second positioning pin (11). A second connecting rod (302) is hinged on the grinding platform (301), and a grinding wheel (304) is assembled at the other end of the second connecting rod (302), and the grinding wheel (304) is connected to the rotating shaft of the third motor (303).

2. According to claim 1, a turbine collector ring online repair device is characterized in that: The main frame structure (1) comprises a frame, which is in an arc shape as a whole, with a groove at the edge for fixing to the turbine collector ring carbon brush holder (4), hinge holes on the left and right sides of the frame for hingedly connecting the left auxiliary frame (2) and the right auxiliary frame (3), a protruding portion offset in the middle of the outer arc between the two ends of the frame for installing a screw lifting mechanism, and a circular hole on the top section of the main frame structure (1) for connecting the first motor (101) to the transmission screw (105).

3. The on-line repair device for a turbine collector ring according to claim 2, characterized in that: The screw lifting mechanism comprises a first motor (101) fixed on the top of the main frame structure (1); a transmission screw (105) is rotatably mounted between a screw base (102) via a bearing (104); five circular holes are machined at both ends of the screw base (102), two of which are used to assemble linear guide rods (106) and one circular hole is used to assemble the bearing (104); the screw base (102) is connected to the protruding part of the main frame structure (1) via the remaining two circular holes, and the linear guide rods (106) are arranged in parallel on both sides of the transmission screw (105).

4. The on-line repair device for a turbine collector ring according to claim 3 is characterized in that: The internal thread of the working platform (103) and the transmission lead screw (105) form a lead screw drive, the working platform (103) and the linear guide rod (106) form a sliding fit, and the working platform (103) and the telescopic electric cylinder (107) are fixed; the telescopic electric cylinder (107) drives the internal lead 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.

5. The on-line repair device for a turbine collector ring according to claim 1, characterized in that: The left side sub-frame (2) comprises a first connecting rod (201), a hole is arranged in the middle of the first connecting rod (201), the hole is connected to one end of a first spring (204), 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 is used to adjust the tension of the first spring (204), and the first positioning hole group (207) is arranged on the bottom plate of the left side sub-frame (2).

6. The on-line repair device for a turbine collector ring according to claim 5, characterized in that: The right sub-frame (3) comprises guide columns arranged in parallel, on which a grinding platform (301) is slidably mounted via a sleeve, and third positioning hole groups (309) are respectively machined at corresponding heights on the two guide columns, and the sleeves on the two guide columns are selectively positioned and mounted on the third positioning hole groups (309) via a first positioning pin (10) and a second positioning pin (11).

7. The on-line repair device for a turbine collector ring according to claim 6, characterized in that: A second connecting rod (302) is hinged on a guide column located on the second positioning pin (11), a hole is opened in the middle of the second connecting rod (302), the 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), the second clamp (306) is fixed on a fourth positioning pin (307), the fourth positioning pin (307) is selectively inserted in the second positioning hole group (308) and is used to adjust the tension of the second spring (305), the second positioning hole group (308) is processed on the grinding platform (301), the third motor (303) is fixed at the bottom of the end of the second connecting rod (302), and the output shaft of the third motor (303) is connected to the grinding wheel (304).

8. The on-line repair device for a turbine collector ring according to claim 1, characterized in that: The sides of the main frame structure (1) at which the left sub-frame (2) and the right sub-frame (3) are hingedly connected are respectively processed with edge grooves, and the left sub-frame (2) is hingedly connected to the position of the edge groove of the main frame structure (1) by means of a first hinge bolt (6) and a third hinge bolt (8) arranged in pairs up and down; the right sub-frame (3) is hingedly connected to the position of the edge groove of the main frame structure (1) by means of a second hinge bolt (7) and a fourth hinge bolt (9) arranged in pairs up and down.

9. A method for online repairing of a turbine collector ring, characterized in that: The repair method is implemented by using the turbine collector ring online repair device according to any one of claims 1 to 8, comprising the following steps: Step 1: Adjust the hinged position of the equipment and dock it with the turbine collector ring brush holder (4): When the turbine collector ring (5) needs to be repaired, after ensuring the working conditions, the hinged postures of the three frames, namely the main frame structure (1), the left auxiliary frame (2) and the right auxiliary frame (3), are first adjusted so that the three frames are respectively fixed on the turbine collector ring carbon brush holder (4); Step 2, the rubber wheel (203) is matched with the turbine collector ring (5): After the three frames are fixed, the first connecting rod (201) is rotated to make the rubber wheel (203) tangent to the turbine collector ring (5), and the tensioning force of the first spring (204) on the first connecting rod is adjusted 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 metal film: After the rubber wheel (203) is adjusted, the second motor (202) under the first connecting rod (201) is started, and the rubber wheel (203) drives the turbine collector ring (5) to rotate. The movement of the additive manufacturing welding head (109) is controlled by controlling the screw lifting mechanism and the telescopic electric cylinder (107), so that the welding head reaches a suitable 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 sent into the molten pool so that the welding wire is fully melted in the molten pool. As the additive manufacturing welding head and the surface of the turbine collector ring move relative to each other, a coating is formed on the surface of the turbine collector ring (5). The additive manufacturing welding head is driven to move by the screw lifting mechanism and the telescopic electric cylinder. The above process is repeated multiple times to complete the complete coverage of the contact surface of the turbine collector ring by the metal coating; Step 4, polishing of metal film: After the metal film is covered, the additive manufacturing welding head is controlled to return to a safe position, the second motor (202) is stopped, the turbine collector ring (5) stops rotating, the grinding platform (301) is adjusted, the second connecting rod (302) is rotated to make the grinding wheel (304) tangent to the surface of the turbine collector ring (5), the position of the fourth positioning pin (307) in the second positioning hole group (308) is adjusted, and the tension of the second spring (305) on the second connecting rod (302) is adjusted to ensure that the grinding wheel (304) and the metal film surface are in contact. The third motor (303) is started to drive the grinding wheel to rotate, and the second motor (202) is started to make the rubber wheel drive the turbine collector ring to rotate, so that the grinding wheel can grind the metal film on the entire surface of the turbine collector ring; after the 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 of the grinding platform (301), and the above grinding process is repeated to finally complete the grinding of all the metal films on the surface of the turbine collector ring.

10. A method for online repairing a turbine collector ring according to claim 9, characterized in that: During operation, the lifting and lowering of the working platform (103) is controlled by the lead 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, and the rotation of the rubber wheel (203) is controlled by the second motor (202), thereby realizing the rotation of the turbine collector ring (5).

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