Repair tool and repair method

Abstract

The invention relates to a repairing tool and method, the repairing tool comprises a hollow shaft seat, a leveling mechanism and a grinding mechanism, and the hollow shaft seat is used for installing a to-be-repaired part; the leveling mechanism is connected to the hollow shaft seat, the leveling mechanism and the hollow shaft seat can rotate relatively so as to measure the flatness of the repaired surface of the to-be-repaired part, and the area, needing to be ground, on the repaired surface and / or the grinding amount are / is determined according to the flatness; and the grinding mechanism is connected to the hollow shaft seat, and the grinding mechanism and the hollow shaft seat can rotate relatively so as to grind and repair the repaired surface based on the area needing to be ground and / or the grinding amount. According to the repairing tool, the repairing face of the to-be-repaired part can be repaired, a brand-new to-be-repaired part does not need to be replaced, the problems that non-standard customized parts of a nuclear power station are scarce in spare parts, long in purchasing period and high in cost are solved, and economic losses caused by long-term unavailability of equipment due to part replacement are avoided.

Description

Technical Field

[0001] This application relates to the field of precision component repair technology for nuclear power plants, and in particular to a repair tooling and repair method. Background Technology

[0002] Nuclear power plants contain a large number of specialized equipment requiring high precision and reliability, such as hydraulic test pumps. The sealing performance of their core component (check valve guide seat) directly affects system safety and operational efficiency. These components often have non-standard geometries, extremely high dimensional tolerances, geometric tolerances, and surface finish requirements. Furthermore, due to their exposure to radiation, their materials and processing techniques are unique.

[0003] In related technologies, when the critical sealing surface of such key components (such as the sealing surface of the check valve guide seat) develops defects such as scratches and pits due to long-term use or accidental damage, resulting in sealing failure, the conventional repair method is to replace the component with a completely new one.

[0004] However, these components are mostly non-standard custom parts, with scarce or no spare parts in stock, resulting in extremely long procurement cycles and high procurement costs. Moreover, since the equipment to which these components belong (such as hydraulic test pumps) is usually nuclear safety-related equipment, damage to them may cause the entire generator set to fail, resulting in economic losses. Summary of the Invention

[0005] Therefore, it is necessary to provide a repair tool and repair method to address issues such as scratches or dents on the sealing surfaces of non-standard customized parts for nuclear power plants.

[0006] This application provides a repair fixture, the repair fixture comprising:

[0007] Hollow shaft seat, used to install the part to be repaired;

[0008] A leveling mechanism is connected to the hollow shaft seat. The leveling mechanism and the hollow shaft seat can rotate relative to each other to measure the flatness of the repair surface of the part to be repaired, and determine the area to be ground and / or the amount of grinding on the repair surface based on the flatness.

[0009] A grinding mechanism is connected to the hollow shaft seat. The grinding mechanism and the hollow shaft seat can rotate relative to each other to grind and repair the repair surface based on the area to be ground and / or the amount of grinding.

[0010] In one embodiment, the repair fixture further includes an installation mechanism, which includes a bearing and a connecting arm. The bearing is fitted onto the hollow shaft seat, and one end of the connecting arm is connected to the outer ring of the bearing, while the other end is connected to the leveling mechanism or the grinding mechanism.

[0011] In one embodiment, the hollow shaft seat includes a first section and a second section coaxially connected, the first section having a receiving groove at one end opposite to the second section for accommodating the part to be repaired, and the bearing being sleeved on the second section.

[0012] In one embodiment, the repair fixture further includes a drive mechanism, which includes a motor. The output end of the motor is connected to the end of the second segment opposite to the first segment, and the motor is capable of driving the hollow shaft seat to rotate.

[0013] In one embodiment, the repair fixture further includes a drive mechanism, which includes a drive disk fitted onto the outer ring of the bearing. The connecting arm is connected to the drive disk, and the drive disk is capable of driving the outer ring of the bearing to rotate.

[0014] In one embodiment, the drive mechanism includes a first thrust plate and a second thrust plate, both connected to the outer ring of the bearing, with the first thrust plate and the second thrust plate respectively located on both axial sides of the bearing.

[0015] In one embodiment, the second thrust disc is located on the side of the bearing opposite to the first segment;

[0016] The repair tooling also includes a measuring mechanism, which comprises:

[0017] The mounting base is sleeved and threadedly connected to the second section and is located on the side of the bearing away from the first section. The mounting base has a mounting hole on the end face of the side near the bearing.

[0018] The first elastic element, the spring seat, and the load sensor, which are connected in sequence, are all housed in the mounting hole, wherein the end of the first elastic element facing away from the spring seat abuts against the second thrust plate.

[0019] In one embodiment, the radial dimension of the first segment is greater than the radial dimension of the second segment, so that a stepped surface is formed between the outer walls of the first segment and the outer walls of the second segment;

[0020] The installation mechanism also includes a pressure equalizing pad, which is sleeved on the second section and located between the bearing and the stepped surface.

[0021] In one embodiment, the grinding mechanism includes a connecting shaft, a second elastic element, and a grinding sandpaper pad connected in sequence, with the connecting shaft rotatably connected to the hollow shaft seat.

[0022] In one embodiment, the grinding mechanism further includes a plastic pad and a rubber pad, wherein the plastic pad, the rubber pad and the abrasive paper pad are stacked in sequence, and the plastic pad is connected to the second elastic member.

[0023] In one embodiment, a receiving groove is provided on the end face of the hollow shaft seat;

[0024] The repair tooling also includes a fixing mechanism, which includes:

[0025] A pressure plate is provided on the side of the workpiece to be repaired that is away from the hollow shaft seat;

[0026] A connector passes sequentially through the pressure plate and the part to be repaired, and is connected to the wall of the receiving groove to press the part to be repaired against the hollow shaft seat.

[0027] In one embodiment, the fixing mechanism further includes a sleeve that passes through the connection hole of the part to be repaired, and there is a radial gap between the outer wall of the sleeve and the wall of the connection hole. The connector passes through the sleeve and is connected to the wall of the receiving groove.

[0028] The repair fixture also includes a turning tool mechanism, which is rotatably connected to the hollow shaft seat. The turning tool mechanism and the hollow shaft seat can rotate relative to each other to perform turning repair on the repair surface.

[0029] This application also provides a repair method, the repair method comprising:

[0030] Fix the part to be repaired to the hollow shaft seat;

[0031] Install a leveling mechanism, and measure the flatness of the repair surface of the part to be repaired by the relative rotation of the leveling mechanism and the hollow shaft seat;

[0032] Based on the measured flatness, determine the area and / or amount of grinding required on the repair surface;

[0033] The grinding mechanism is installed, and the repair surface is ground and repaired by the relative rotation between the grinding mechanism and the hollow shaft seat.

[0034] In one embodiment, during grinding repair, coarse grinding or fine grinding is selected based on the degree of damage or flatness deviation of the repair surface.

[0035] The aforementioned repair fixture, by incorporating a hollow shaft seat, provides an installation reference for the part to be repaired, ensuring its fixed position during subsequent measurement and repair processes. This avoids measurement errors and reduced repair accuracy caused by unstable installation. The leveling mechanism is rotatably connected to the hollow shaft seat. Through relative rotation with the hollow shaft seat, the flatness of the repair surface of the part to be repaired can be comprehensively measured. Based on the measurement data, the specific areas requiring grinding and the required grinding amount can be directly analyzed and determined. Compared to traditional measurement methods, relative rotation measurement can cover all areas of the repair surface, capturing flatness deviations at various points, providing accurate data support for subsequent repairs. The grinding mechanism is rotatably connected to the hollow shaft seat. Based on the flatness data obtained from the leveling mechanism, the grinding area and / or grinding amount are determined. Targeted grinding and repair of the repair surface is performed through the relative rotation of the grinding mechanism and the hollow shaft seat.

[0036] The repair tooling of this application can repair the repair surface of the part to be repaired without replacing it with a brand new part. This not only solves the problems of scarcity, long procurement cycle and high cost of non-standard customized spare parts for nuclear power plants, but also avoids economic losses caused by long-term equipment unavailability due to part replacement. Attached Figure Description

[0037] Figure 1 A cross-sectional view of the check valve provided in this application.

[0038] Figure 2 A cross-sectional view of the guide seat provided in this application.

[0039] Figure 3 A sectional view of the mounting mechanism provided in this application, on which a leveling mechanism is installed.

[0040] Figure 4 A cross-sectional view of the grinding mechanism mounted on the mounting mechanism provided in this application.

[0041] Figure 5 A schematic diagram of the measuring mechanism provided in this application.

[0042] Figure 6 This is a schematic diagram of the grinding mechanism provided in this application.

[0043] Figure label:

[0044] 100. Hollow shaft seat; 110. First section; 120. Second section;

[0045] 200. Leveling agency;

[0046] 300. Grinding mechanism; 310. Connecting shaft; 320. Second elastic element; 330. Grinding sandpaper pad; 340. Plastic pad; 350. Rubber pad; 360. Connecting seat;

[0047] 400. Mounting mechanism; 410. Bearing; 420. Connecting arm; 430. Pressure equalizing pad;

[0048] 500. Drive mechanism; 510. Motor; 520. Drive disc; 530. First thrust disc; 540. Second thrust disc;

[0049] 600 Measuring mechanism; 610 Mounting base; 611 Mounting hole; 620 First elastic element; 630 Spring seat; 640 Load sensor; 650 Locking nut;

[0050] 700. Fixing mechanism; 710. Pressure plate; 720. Connecting parts; 730. Washers;

[0051] 800. Item to be repaired;

[0052] 900, Check valve; 910, Guide seat; 920, Sealing ring; 930, Valve body; 940, Valve ball; 950, Valve seat. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0054] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0055] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0059] In the field of precision components technology for nuclear power plants, such as Figure 1 and Figure 2 As shown, the check valve 900 is a key component in the hydraulic test pump, used to prevent backflow of the medium, and its sealing performance directly affects system safety. The check valve 900 includes components such as a guide seat 910, a sealing ring 920, a valve body 930, a valve ball 940, and a valve seat 950. Scratches, dents, or other damage to the guide seat 910 of the check valve 900 can cause the metal-to-metal seal between the guide seat 910 and the valve body 930 to fail, resulting in leakage under high pressure.

[0060] Therefore, this application provides a repair tooling, such as Figure 3 and Figure 4As shown, the repair fixture includes a hollow shaft seat 100, a leveling mechanism 200, and a grinding mechanism 300. The hollow shaft seat 100 is used to mount the part 800 to be repaired. The leveling mechanism 200 is connected to the hollow shaft seat 100, and the leveling mechanism 200 and the hollow shaft seat 100 can rotate relative to each other to measure the flatness of the repair surface of the part 800 to be repaired, and to determine the area and / or amount of grinding on the repair surface based on the flatness. The grinding mechanism 300 is connected to the hollow shaft seat 100, and the grinding mechanism 300 and the hollow shaft seat 100 can rotate relative to each other to grind and repair the repair surface based on the area and / or amount of grinding required.

[0061] The aforementioned repair fixture, by setting up a hollow shaft seat 100, provides an installation reference for the part 800 to be repaired, ensuring that the part 800 remains in a fixed position during subsequent measurement and repair processes, avoiding measurement errors and reduced repair accuracy caused by unstable installation. The leveling mechanism 200 is rotatably connected to the hollow shaft seat 100. Through relative rotation with the hollow shaft seat 100, the flatness of the repair surface of the part 800 can be comprehensively measured, and the specific areas requiring grinding and the required grinding amount can be directly determined based on the measurement data. Compared to traditional measurement methods, relative rotation measurement can cover all areas of the repair surface, capturing flatness deviations at various points on the repair surface, providing accurate data support for subsequent repairs. The grinding mechanism 300 is rotatably connected to the hollow shaft seat 100. Based on the flatness data measured by the leveling mechanism 200, the grinding area and / or grinding amount are determined. Targeted grinding and repair of the repair surface is performed through the relative rotation of the grinding mechanism 300 and the hollow shaft seat 100. The repair tooling of this application can repair the repair surface of the part to be repaired 800 without replacing it with a brand new part to be repaired 800. This not only solves the problems of scarcity, long procurement cycle and high cost of non-standard customized spare parts for nuclear power plants, but also avoids economic losses caused by long-term equipment unavailability due to part replacement.

[0062] It should be noted that in this embodiment, the component to be repaired 800 is the guide seat 910 of the check valve 900. In other embodiments, the component to be repaired 800 can be any structure that needs to be repaired.

[0063] In one embodiment, such as Figure 3 and Figure 4As shown, the repair fixture also includes an installation mechanism 400, which includes a bearing 410 and a connecting arm 420. The bearing 410 is sleeved on the hollow shaft seat 100. One end of the connecting arm 420 is connected to the outer ring of the bearing 410, and the other end is connected to the leveling mechanism 200 or the grinding mechanism 300. By sleeved on the hollow shaft seat 100, and with one end of the connecting arm 420 connected to the outer ring of the bearing 310 and the other end connected to the leveling mechanism 200 or the grinding mechanism 300, the leveling mechanism 200 and the grinding mechanism 300 can be installed on the hollow shaft seat 100 with the cooperation of the bearing 410 and the connecting arm 420. This ensures the firmness of the installation of the leveling mechanism 200 and the grinding mechanism 300, and also allows for relative rotation between the leveling mechanism 200, the grinding mechanism 300, and the hollow shaft seat 100 through the rotational characteristics of the bearing 410.

[0064] It should be noted that in this embodiment, an installation mechanism 400 is provided, and the leveling mechanism 200 or the grinding mechanism 300 is selectively installed on the connecting arm 420 of the installation mechanism 400. In other embodiments, two installation mechanisms 400 can be provided, one installation mechanism 400 connected to the leveling mechanism 200 and the other installation mechanism 400 connected to the grinding mechanism 300.

[0065] In this embodiment, the connecting arm 420 has a U-shaped structure, with one end connected to the outer ring of the bearing 410 and the other end connected to the leveling mechanism 200 or the grinding mechanism 300. In other embodiments, the connecting arm 420 may be L-shaped or a rod-shaped structure with adjustable length.

[0066] In one embodiment, such as Figure 3 and Figure 4 As shown, the hollow shaft seat 100 includes a first section 110 and a second section 120 coaxially connected. The end of the first section 110 facing away from the second section 120 has a receiving groove for accommodating the part 800 to be repaired. The bearing 410 is sleeved on the second section 120. By configuring the hollow shaft seat 100 with the first section 110 and the second section 120 coaxially connected, and providing a receiving groove at the end of the first section 110 facing away from the second section 120 to accommodate the part 800 to be repaired, the part 800 can be accurately positioned and installed, ensuring the coaxiality between the part 800 and the hollow shaft seat 100, and providing a reference for subsequent flatness measurement and grinding repair. By fitting the bearing 410 onto the second section 120, the functions of each section of the hollow shaft seat 100 are rationally allocated. The first section 110 is focused on accommodating and installing the part to be repaired 800, while the second section 120 is focused on cooperating with the installation mechanism 400. This makes the structural layout of the entire hollow shaft seat 100 more reasonable, which not only meets the installation requirements of the part to be repaired 800, but also ensures the stability of the bearing 410 after installation.

[0067] In this embodiment, as Figure 3 and Figure 4 As shown, in one embodiment, the radial dimension of the first segment 110 is greater than the radial dimension of the second segment 120, so that a stepped surface is formed between the outer wall of the first segment 110 and the outer wall of the second segment 120; the mounting mechanism 400 also includes a pressure equalizing pad 430, which is sleeved on the second segment 120 and located between the bearing 410 and the stepped surface. The pressure equalizing pad 430 is fitted onto the second section 120 and located between the bearing 410 and the stepped surface. The stepped surface can provide stable support and positioning for the pressure equalizing pad 430, preventing axial displacement of the pressure equalizing pad 430 during use. The pressure equalizing pad 430 can evenly distribute the pressure of the bearing 410 on the first section 110, preventing the hollow shaft seat 100 from being deformed due to excessive local stress caused by pressure concentration during operation. This ensures the structural stability and coaxiality of the hollow shaft seat 100. At the same time, the pressure equalizing pad 430 can also play a buffering role, reducing the vibration generated when the bearing 410 rotates and being transmitted to the hollow shaft seat 100 and the part 800 to be repaired.

[0068] In one embodiment, the outer ring of the bearing 410 can be manually driven to rotate the connecting arm 420, thereby causing the leveling mechanism 200 or the grinding mechanism 300 connected to the connecting arm 420 to rotate.

[0069] In one embodiment, such as Figure 3 and Figure 4 As shown, the repair fixture also includes a drive mechanism 500, which includes a motor 510. The output end of the motor 510 is connected to the end of the second section 120 opposite to the first section 110. The motor 510 can drive the hollow shaft seat 100 to rotate. By connecting the output end of the motor 510 to the end of the second section 120 opposite to the first section 110, the hollow shaft seat 100 can be driven to rotate by the motor 510. This eliminates the need for manual operation to drive the hollow shaft seat 100 to rotate relative to the leveling mechanism 200 and the grinding mechanism 300, reducing the labor intensity of the workers and ensuring the uniformity and stability of the rotation speed of the hollow shaft seat 100.

[0070] In this embodiment, a spline hole is provided on the side of the second segment 120 opposite to the first segment 110, and the output shaft of the motor 510 is a spline shaft, which realizes power transmission through spline engagement.

[0071] In this embodiment, motor 510 is a servo motor.

[0072] In one embodiment, such as Figure 3 and Figure 4As shown, the repair fixture also includes a drive mechanism 500, which includes a drive disc 520. The drive disc 520 is sleeved on the outer ring of the bearing 410, and a connecting arm 420 is connected to the drive disc 520. The drive disc 520 can drive the outer ring of the bearing 410 to rotate. By sleeved on the outer ring of the bearing 410, the drive disc 520 can drive the outer ring of the bearing 410 to rotate, thereby driving the connecting arm 420 and the leveling mechanism 200 or grinding mechanism 300 installed on the connecting arm 420 to rotate around the hollow shaft seat 100.

[0073] Moreover, by driving with motor 510 or drive disk 520, the distortion of flatness measurement data caused by speed fluctuations during manual driving and the poor flatness of the repair surface caused by uneven grinding force and speed during grinding repair are avoided; at the same time, the driving method of motor 510 or drive disk 520 can accurately control the rotation angle and speed, adapting to the measurement and repair needs of different parts 800 to be repaired.

[0074] In summary, the repair fixture of this application has three driving methods. The first is manual direct drive of the connecting arm 420 or the drive disk 520 to achieve relative rotation. The second is that the motor 510 drives the hollow shaft seat 100 to rotate, causing the repair surface to move relative to the leveling mechanism 200 or the grinding mechanism 300. The third is that the drive disk 520 drives the outer ring of the bearing 410 and the connecting arm 420 to rotate, causing the leveling mechanism 200 or the grinding mechanism 300 to move around the repair surface. This application provides multiple driving methods, allowing for flexible selection of the driving method according to the actual repair scenario.

[0075] In one embodiment, such as Figure 3 and Figure 4 As shown, the drive mechanism 500 includes a first thrust disk 530 and a second thrust disk 540, both connected to the outer ring of the bearing 410. The first thrust disk 530 and the second thrust disk 540 are respectively located on both axial sides of the bearing 410. By setting the first thrust disk 530 and the second thrust disk 540, the outer ring of the bearing 410 is limited from both axial sides, ensuring the coaxiality and stability of the outer ring of the bearing 410 during rotation and preventing axial displacement of the outer ring of the bearing 410 during rotation.

[0076] In one embodiment, such as Figures 3 to 5 As shown, the second thrust plate 540 is located on the side of the bearing 410 opposite to the first section 110; the repair fixture also includes a measuring mechanism 600, which includes:

[0077] Mounting base 610 is sleeved and threadedly connected to the second section 120 and is located on the side of bearing 410 away from the first section 110. Mounting base 610 has mounting hole 611 on the end face of the side near bearing 410.

[0078] The first elastic element 620, the spring seat 630 and the load sensor 640, which are connected in sequence, are all housed in the mounting hole 611. The end of the first elastic element 620 facing away from the spring seat 630 abuts against the second thrust plate 540.

[0079] By fitting and threading the mounting base 610 onto the second section 120, and placing it on the side of the bearing 410 away from the first section 110, the first elastic element 620, the spring seat 630, and the load sensor 640, connected in sequence, are housed in the mounting hole 611. The end of the first elastic element 620 away from the spring seat 630 abuts against the second thrust plate 540. This allows the load sensor 640 to sense the pressure changes transmitted by the second thrust plate 540 through the first elastic element 620 during the measurement process of the leveling mechanism 200 and the repair process of the grinding mechanism 300. This enables real-time monitoring of the contact pressure between the leveling mechanism 200 and the repair surface, as well as the grinding pressure between the grinding mechanism 300 and the repair surface. This facilitates timely adjustment of pressure parameters by the staff, preventing secondary damage to the workpiece 800 due to excessive pressure, or affecting measurement accuracy and grinding efficiency due to insufficient pressure.

[0080] Furthermore, the mounting base 610 is connected to the second section of 120 threads, which facilitates the adjustment of the mounting position of the mounting base 610, thereby adjusting the preload of the first elastic element 620 to meet the pressure monitoring requirements under different working conditions.

[0081] It should be noted that the wiring harness of the load sensor 640 is led out through the mounting hole 611 and connected to an external data acquisition or control system.

[0082] In this embodiment, the first elastic element 620 is a spring. In other embodiments, elements with elastic deformation capabilities, such as disc springs and rubber elastomers, can also be used.

[0083] In this embodiment, as Figures 3 to 5 As shown, the measuring mechanism 600 also includes a locking nut 650, which is threaded to the second section 120 and abuts against the mounting base 610 to prevent the mounting base 610 from loosening during vibration or rotation.

[0084] In one embodiment, such as Figure 4 and Figure 6As shown, the grinding mechanism 300 includes a connecting shaft 310, a second elastic element 320, and a grinding sandpaper pad 330 connected in sequence. The connecting shaft 310 is rotatably connected to the hollow shaft seat 100. The connecting shaft 310, the second elastic element 320, and the grinding sandpaper pad 330 are connected in sequence. The grinding sandpaper pad 330 can flexibly contact the repair surface of the part to be repaired 800 through the elastic action of the second elastic element 320. During the grinding process, the second elastic element 320 can adaptively expand and contract according to the unevenness of the repair surface, ensuring that the grinding sandpaper pad 330 always fits evenly with the repair surface, avoiding problems such as inadequate or excessive grinding due to scratches or pits on the repair surface. The connecting shaft 310 is connected to the connecting arm 420 of the mounting mechanism 400, ensuring the smooth rotation of the grinding mechanism 300 as a whole. Combined with the buffering effect of the second elastic element 320, it reduces the rigid impact on the repair surface during grinding, effectively removing defects from the repair surface while protecting the original structure of the repair surface, and improving the smoothness and flatness of the repaired surface.

[0085] In this embodiment, as Figure 4 and Figure 6 As shown, the connecting shaft 310 is a threaded shaft, and the axial position of the grinding mechanism 300 can be adjusted by screwing it into the corresponding threaded hole on the connecting arm 420, thereby changing the grinding preload.

[0086] In this embodiment, as Figure 4 and Figure 6 As shown, a connecting groove is provided at one end of the connecting shaft 310. The connecting groove is used to accommodate the second elastic element 320 to ensure the stability of the elastic connection.

[0087] In this embodiment, the second elastic element 320 is a spring. In other embodiments, other elastic elements, such as rubber columns, pneumatic springs, etc., may also be used.

[0088] In one embodiment, such as Figure 4 and Figure 6 As shown, the grinding mechanism 300 also includes a plastic pad 340 and a rubber pad 350. The plastic pad 340, rubber pad 350, and abrasive paper pad 330 are stacked sequentially, and the plastic pad 340 is connected to the second elastic element 320. The plastic pad 340 provides stable support for the rubber pad 350 and abrasive paper pad 330, ensuring structural rigidity during grinding and preventing wrinkling or deformation of the abrasive paper pad 330 due to uneven stress. The rubber pad 350 further enhances the flexibility and adaptability of the abrasive paper pad 330 in contact with the repair surface, better buffering the impact force during grinding. Simultaneously, the elastic deformation characteristics of the rubber pad 350 make the pressure distribution of the abrasive paper pad 330 on the repair surface more uniform.

[0089] In this embodiment, as Figure 4 and Figure 6 As shown, the grinding mechanism 300 also includes a connecting seat 360, through which the plastic pad 340 is connected to the second elastic member 320.

[0090] In one embodiment, such as Figure 3 and Figure 4 As shown, the hollow shaft seat 100 has a receiving groove on its end face; the repair fixture also includes a fixing mechanism 700, which includes a pressure plate 710 and a connector 720. The pressure plate 710 is located on the side of the part to be repaired 800 away from the hollow shaft seat 100; the connector 720 passes through the pressure plate 710 and the part to be repaired 800 in sequence and is connected to the groove wall of the receiving groove to press the part to be repaired 800 tightly onto the hollow shaft seat 100. By placing the pressure plate 710 on the side of the part to be repaired 800 away from the hollow shaft seat 100 and connecting the connector 720 through the pressure plate 710 and the part to be repaired 800 in sequence and connecting to the groove wall of the receiving groove, the part to be repaired 800 is firmly pressed onto the hollow shaft seat 100, preventing the part to be repaired 800 from shifting or loosening due to vibration, rotation, etc. during the flatness measurement and grinding repair process, and ensuring that the relative position of the part to be repaired 800 and the hollow shaft seat 100 is fixed.

[0091] In this embodiment, the component to be repaired 800 and the hollow shaft seat 100 are coaxially arranged.

[0092] It should be noted that in this embodiment, the component to be repaired 800 is the guide seat 910 of the check valve 900. The guide seat 910 is provided with four first connection holes, and the pressure plate 710 is provided with four corresponding second connection holes. There are four connecting parts 720. The four connecting parts 720 pass through the corresponding second connection holes, first connection holes and sleeves in sequence, and are finally locked in the threaded hole of the receiving groove of the hollow shaft seat 100.

[0093] In this embodiment, the connector 720 is an internal hex bolt.

[0094] In this embodiment, as Figure 3 and Figure 4 As shown, the fixing mechanism 700 also includes a washer 730, which is sandwiched between the pressure plate 710 and the part to be repaired 800 to distribute the clamping force evenly and prevent the surface of the part to be repaired 800 from being damaged.

[0095] In this embodiment, as Figure 3 and Figure 4 As shown, the fixing mechanism 700 also includes an anti-loosening washer, which is located in the second connecting hole between the bolt head and the pressure plate 710, and is used to prevent the bolt from loosening due to vibration.

[0096] In one embodiment, such as Figure 3and Figure 4 As shown, the fixing mechanism 700 also includes a sleeve, which passes through the first connecting hole of the part to be repaired 800, and there is a radial gap between the outer wall of the sleeve and the wall of the first connecting hole. The connector 720 passes through the sleeve and is connected to the wall of the receiving groove. By inserting the sleeve into the first connecting hole of the part to be repaired 800, the sleeve can guide and protect the connector 720, preventing the connector 720 from directly contacting the inner wall of the first connecting hole of the part to be repaired 800, and preventing wear or scratches to the inner wall of the first connecting hole during the tightening of the connector 720.

[0097] A radial gap is left between the outer wall of the sleeve and the wall of the first connecting hole. The setting of the radial gap can provide a certain adjustment space for the installation of the part to be repaired 800, so as to facilitate the positioning of the part to be repaired 800 in the receiving groove and ensure the coaxiality of the part to be repaired 800 and the hollow shaft seat 100.

[0098] In this embodiment, the leveling mechanism 200 includes a dial indicator and a dial indicator holder, with the dial indicator mounted on the connecting arm 420 via the dial indicator holder. During measurement, the dial indicator probe is rotated to move circumferentially along the repair surface, and values ​​at different positions are read to calculate the flatness deviation of the repair surface.

[0099] In one embodiment, the repair fixture also includes a cutting tool mechanism rotatably connected to the hollow shaft seat 100. The cutting tool mechanism and the hollow shaft seat 100 can rotate relative to each other to perform turning repair on the repair surface. By setting up the cutting tool mechanism, when the repair surface has large protrusions or deep damage, rough machining can be performed first with a cutting tool, and then grinding can be performed using the grinding mechanism 300, thereby improving repair efficiency and accuracy.

[0100] In this embodiment, the cutting tool mechanism includes a cutting tool and a cutting tool holder, which is mounted on the connecting arm 420 via the cutting tool holder.

[0101] It should be noted that when the scratches or pits on the surface of the part to be repaired (800) are shallow, grinding with the grinding mechanism (300) is sufficient for repair. When the surface to be repaired has large protrusions, twisting deformation, or deep damage, the cutting tool mechanism should be used first for preliminary turning and leveling, and then the grinding mechanism (300) should be used for grinding and polishing.

[0102] This application also provides a repair method, which includes:

[0103] Fix the part to be repaired 800 to the hollow shaft seat 100;

[0104] Install the leveling mechanism 200, and measure the flatness of the repair surface of the part 800 to be repaired by the relative rotation of the leveling mechanism 200 and the hollow shaft seat 100.

[0105] Based on the measured flatness, determine the area and / or amount of grinding required on the repair surface;

[0106] The grinding mechanism 300 is installed, and the repair surface is ground and repaired by the relative rotation between the grinding mechanism 300 and the hollow shaft seat 100.

[0107] The above-described repair method first fixes the part to be repaired 800 to the hollow shaft seat 100 to ensure the stability of the part to be repaired 800 in subsequent processes; then, a leveling mechanism 200 is installed, and the relative rotation between the leveling mechanism 200 and the hollow shaft seat 100 is used to measure the flatness of the repair surface, which can comprehensively grasp the defects of the repair surface and provide an accurate basis for subsequent grinding repair; then, based on the measured flatness, the area to be ground and the amount of grinding are determined, making the grinding repair work more targeted and preventing excessive grinding from damaging the original dimensional accuracy of the part to be repaired 800; finally, a grinding mechanism 300 is installed, and grinding repair is performed through its relative rotation with the hollow shaft seat 100, which can remove scratches, pits and other defects on the repair surface and restore the flatness and smoothness of the repair surface.

[0108] In one embodiment, during the grinding repair, coarse grinding or fine grinding is selected based on the degree of damage or flatness deviation of the repair surface. For example, coarse grinding is selected when the damage is severe or the flatness deviation is large; fine grinding is selected when the damage is minor or near completion and a high surface finish is required.

[0109] When performing grinding repairs, if the surface to be repaired is severely damaged or has a large flatness deviation, coarse grinding can be used, which involves using sandpaper with a lower grit to quickly remove material. If the surface to be repaired is nearing completion or a higher surface finish is required, fine grinding should be used, which involves using sandpaper with a higher grit for polishing. Coarse and fine grinding can be performed in stages based on measurement results.

[0110] This application also provides specific steps for measuring the flatness of the repair surface of the guide seat 910:

[0111] Before use, check that each component meets the design requirements, including geometric tolerances, dimensional tolerances, surface finish requirements, and reference dimensions. Ensure that the surfaces of each component are clean and free of dust and debris, that they are installed in place, and that the appropriate amount of lubricant and anti-seize agent is applied.

[0112] All threads are intact and undamaged, and the surface is evenly coated with molybdenum disulfide anti-seize agent.

[0113] All mounting bolts have been tightened.

[0114] Clean the defective guide seat 910 thoroughly, removing any surface dust or foreign matter;

[0115] The guide seat 910 is connected back-to-back with the hollow shaft seat 100, and the radial clearance is maintained at 0.02-0.04mm.

[0116] Sleeves are inserted into the four first connecting holes of the guide seat 910, with the radial clearance maintained at 0.05-0.08 mm.

[0117] Connectors 720 are inserted into the four first connection holes of guide seat 910 to press the pressure plate 710 and the pad together with a torque of 20 Nm.

[0118] Use a micrometer to measure the total thickness of the guide seat 910 rear end face and the hollow shaft seat 100 contact end face in a circle divided into four equal parts (corresponding to the phase of the four connectors 720). Adjust the torque of the connectors 720 appropriately so that the thickness deviation is no more than 0.01 mm, and the maximum torque is no more than 20 Nm and the minimum is no more than 18 Nm.

[0119] Install the equalizing pad 430 and the first thrust plate 530, and apply a layer of lubricating grease evenly on the first thrust plate 530 with a thickness of 0.01mm.

[0120] The four evenly distributed screw holes on the flange of the hollow bearing seat 100 corresponding to the equalizing pad 430 are used as set screw holes for disassembling the bearing 410.

[0121] The bearing 410 is heated to 120°C and then installed on the hollow shaft seat 100, against the first thrust plate 530, and the bearing 410 is allowed to cool to its natural temperature.

[0122] Heat the drive disc 520 to 120°C, then install it onto the bearing 410, and wait for the bearing 410 to cool to its natural temperature.

[0123] Install the second thrust plate 540, assemble the spring, spring seat 630, and load sensor 640 onto the mounting base 610, screw the cover of the mounting base 610 onto the second section 120 of the hollow shaft seat 100, the final torque is 36 Nm, then screw on the locking nut 650, the torque is 60 Nm.

[0124] The outer ring preload of bearing 410 achieves zero or negative clearance in bearing 410.

[0125] The load sensor 640 leads have a reserved interface for connection to the central processor to achieve intelligent pressure control.

[0126] Install the connecting arm 420 onto the drive plate 520 using hex bolts and anti-loosening washers.

[0127] Install the dial indicator holder onto the connecting arm 420.

[0128] The dial indicator holder has multiple dial indicator mounting holes, which can adjust the installation angle and position of the dial indicator within a certain range.

[0129] Insert the dial indicator into the dial indicator mounting hole, press it to the corresponding reading, screw the locking screw into the screw hole on the side to a torque of about 1 Nm, and tighten the nut to a torque of about 1 Nm.

[0130] Mark the zero point along the circumference and divide the circumference into 8 equal parts, each at 45 degrees.

[0131] Rotate 45 degrees each time and record the corresponding reading until you have completed one full rotation and collected 8 readings. Compare the 8 readings, calculate the flatness deviation value, and draw the corresponding mark for subsequent grinding or turning. Verify 2-3 times to confirm that the data is consistent.

[0132] This application also provides specific steps for grinding the repair surface of the guide seat 910:

[0133] Before use, check that each component meets the design requirements, including geometric tolerances, dimensional tolerances, surface finish requirements, and reference dimensions. Ensure that the surfaces of each component are clean and free of dust and debris, that they are installed in place, and that the appropriate amount of lubricant and anti-seize agent is applied.

[0134] All threads are intact and undamaged, and the surface is evenly coated with molybdenum disulfide anti-seize agent.

[0135] All bolts used for installation and connection have been tightened.

[0136] Clean the defective guide seat 910 thoroughly, removing any surface dust or foreign matter;

[0137] Remove the dial indicator and dial indicator stand;

[0138] The connecting shaft 310 of the grinding mechanism 300 is screwed into the connecting arm 420. The pre-control force is adjusted by rotating the angle. For minor damage to the surface, the pre-control force is smaller, and for more severe damage to the surface, the pre-control force is larger.

[0139] Insert the output shaft (spline shaft) of the servo motor 510 into the spline hole of the second section 120 of the hollow shaft seat 100 and push it to the stop position.

[0140] Install the bracket for motor 510, adjust the motor 510 and hollow shaft seat 100 to be concentric using flat shims, tighten the bolts to a torque of 6 Nm.

[0141] Manual repair: Rotate the handwheel of the servo motor 510 to drive the rotor to rotate, achieving slow grinding. Check the wear of the sandpaper in between, and replace the sandpaper if necessary.

[0142] Choose the appropriate sandpaper grit. For minor surface repairs, use coarser grit sandpaper for rough grinding; for minor damage or finishing touches requiring a high surface finish, use finer grit sandpaper for fine grinding. Use a surface finish tester to check the surface finish until the grinding is satisfactory.

[0143] It should be noted that the turning method is the same as described above. In this case, the grinding mechanism 300 needs to be replaced with the turning tool and tool holder of the turning tool mechanism.

[0144] Turn the outer cylindrical surface of the guide seat 910 with a low speed and a feed rate of 0.005mm per pass, and then use fine sandpaper to grind it to achieve the requirements of roundness and concentricity.

[0145] After completing the above machining, using the outer cylindrical surface of the guide seat 910 as a reference, turn the outer end face of the guide seat 910 with a feed rate of 0.005mm per pass at low speed, and then use fine sandpaper to grind it to achieve the perpendicularity requirement.

[0146] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0147] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A repair tool, characterized in that, The repair fixture includes: Hollow shaft seat (100) for mounting the part to be repaired (800); A leveling mechanism (200) is connected to the hollow shaft seat (100). The leveling mechanism (200) and the hollow shaft seat (100) can rotate relative to each other to measure the flatness of the repair surface of the part to be repaired (800) and determine the area to be ground and / or the amount of grinding on the repair surface based on the flatness. A grinding mechanism (300) is connected to the hollow shaft seat (100). The grinding mechanism (300) and the hollow shaft seat (100) are able to rotate relative to each other to grind and repair the repair surface based on the area to be ground and / or the amount of grinding.

2. The repair fixture according to claim 1, characterized in that, The repair tooling also includes an installation mechanism (400), which includes a bearing (410) and a connecting arm (420). The bearing (410) is sleeved on the hollow shaft seat (100). One end of the connecting arm (420) is connected to the outer ring of the bearing (410), and the other end is connected to the leveling mechanism (200) or the grinding mechanism (300).

3. The repair fixture according to claim 2, characterized in that, The hollow shaft seat (100) includes a first section (110) and a second section (120) connected coaxially. The first section (110) has a receiving groove at one end away from the second section (120) for accommodating the part to be repaired (800). The bearing (410) is sleeved on the second section (120).

4. The repair fixture according to claim 3, characterized in that, The repair tooling also includes a drive mechanism (500), which includes a motor (510). The output end of the motor (510) is connected to one end of the second segment (120) away from the first segment (110). The motor (510) can drive the hollow shaft seat (100) to rotate.

5. The repair fixture according to claim 3, characterized in that, The repair fixture also includes a drive mechanism (500), which includes a drive disk (520) that is fitted onto the outer ring of the bearing (410). The connecting arm (420) is connected to the drive disk (520), and the drive disk (520) can drive the outer ring of the bearing (410) to rotate.

6. The repair fixture according to claim 4 or 5, characterized in that, The drive mechanism (500) includes a first thrust plate (530) and a second thrust plate (540) both connected to the outer ring of the bearing (410), and the first thrust plate (530) and the second thrust plate (540) are respectively located on both sides of the axial direction of the bearing (410).

7. The repair fixture according to claim 6, characterized in that, The second thrust disc (540) is located on the side of the bearing (410) opposite to the first segment (110); The repair fixture further includes a measuring mechanism (600), the measuring mechanism (600) comprising: Mounting base (610) is sleeved and threaded to the second section (120) and located on the side of the bearing (410) away from the first section (110). Mounting base (610) has mounting hole (611) on the end face of the side near the bearing (410). The first elastic element (620), the spring seat (630), and the load sensor (640), which are connected in sequence, are all housed in the mounting hole (611), wherein the end of the first elastic element (620) facing away from the spring seat (630) abuts against the second thrust plate (540).

8. The repair fixture according to claim 3, characterized in that, The radial dimension of the first segment (110) is greater than the radial dimension of the second segment (120) so that a stepped surface is formed between the outer wall of the first segment (110) and the outer wall of the second segment (120); The mounting mechanism (400) further includes a pressure equalizing pad (430), which is sleeved on the second section (120) and located between the bearing (410) and the stepped surface.

9. The repair fixture according to claim 1, characterized in that, The repair fixture also includes a turning tool mechanism, which is rotatably connected to the hollow shaft seat (100). The turning tool mechanism and the hollow shaft seat (100) can rotate relative to each other to perform turning repair on the repair surface.

10. A repair method, characterized in that, The repair method includes: Fix the part to be repaired (800) to the hollow shaft seat (100); Install a leveling mechanism (200), and measure the flatness of the repair surface of the part to be repaired (800) by the relative rotation of the leveling mechanism (200) and the hollow shaft seat (100); Based on the measured flatness, determine the area and / or amount of grinding required on the repair surface; The grinding mechanism (300) is installed, and the repair surface is ground and repaired by the relative rotation between the grinding mechanism (300) and the hollow shaft seat (100).

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