Bore maintenance tool

Abstract

The application relates to an in-hole maintenance tool. The in-hole maintenance tool comprises a polishing mechanism and a recycling mechanism. The polishing mechanism comprises a feeding assembly and a polishing assembly. The feeding assembly is drivingly connected with the polishing assembly. The feeding assembly provides the polishing assembly with a feeding force for abutting against a to-be-polished part. The polishing assembly is used for polishing the to-be-polished part. The recycling mechanism is integrated with the polishing mechanism. The recycling mechanism comprises a recycling dish, a dust suction transmission pipe and a dust suction driving part. One end of the recycling dish is connected with the dust suction transmission pipe. The other end of the recycling dish is connected with the dust suction driving part. The dust suction transmission pipe is provided with a dust suction port. The dust suction port is close to the polishing assembly. The dust suction driving part is used for generating suction force. In this way, the debris is recycled into the recycling dish through the dust suction port and the dust suction transmission pipe in sequence. Through the above arrangement, the efficiency of the strong removal work of the silver gasket is improved. The safety of the strong removal work is ensured. The repair of the sealing surface is facilitated. And the debris pollution is avoided.

Description

Technical Field

[0001] This application relates to the field of nuclear power equipment maintenance technology, and in particular to in-hole maintenance tools. Background Technology

[0002] In equipment maintenance within the RIC (Reactor Instrumentation and Control) building of nuclear power plants, the silver gaskets inside the backflush port of the RIC finger sleeve often deform due to long-term use, making them impossible to remove using conventional methods. Existing tools commonly available on the market are limited by the site's spatial layout, hindering effective removal operations. Furthermore, after removal of the silver gasket, defects often remain on the bottom sealing surface of the backflush port requiring repair, and existing tools lack an integrated solution. In addition, metal shavings generated during removal, if falling into the backflush port, can contaminate the nuclear power system, posing a safety hazard. Therefore, there is an urgent need for a specialized tool that can adapt to the site's spatial layout, efficiently remove the silver gasket and repair the sealing surface, while preventing debris contamination. Summary of the Invention

[0003] Based on this, an in-hole maintenance tool is provided to solve the problems of difficult removal of silver gaskets, difficult repair of sealing surfaces, and debris contamination in the backflush hole of RIC finger sleeves.

[0004] Embodiments of this application disclose an in-hole maintenance tool, comprising:

[0005] A grinding mechanism, comprising a feeding component and a grinding component, wherein the feeding component is drivenly connected to the grinding component, the feeding component provides a feeding force to the grinding component to abut against the workpiece to be ground, and the grinding component is used to grind the workpiece to be ground;

[0006] The recycling mechanism is integrated with the polishing mechanism. The recycling mechanism includes a recycling dish, a dust collection and transmission pipe, and a dust collection and driving component. One end of the recycling dish is connected to the dust collection and transmission pipe, and the other end is connected to the dust collection and driving component. The dust collection and transmission pipe is provided with a dust collection port, which is close to the polishing component. The dust collection and driving component is used to generate suction so that the debris is sequentially collected into the recycling dish through the dust collection port and the dust collection and transmission pipe.

[0007] In one embodiment, the polishing component includes:

[0008] Polish the outer casing;

[0009] A polishing unit is rotatably connected to the polishing housing, and the polishing unit is used to polish the workpiece to be polished;

[0010] A grinding drive component is connected to the grinding unit and drives the grinding unit to rotate.

[0011] In one embodiment, the polishing housing includes a first housing portion and a second housing portion. The first housing portion extends along a first direction, and the polishing unit is rotatably connected to the first housing portion. The second housing portion extends along a second direction perpendicular to the first direction. The polishing drive member is disposed in the second housing portion, and the drive end of the polishing drive member extends into the first housing portion and is drivenly connected to the polishing unit.

[0012] In one embodiment, the grinding drive includes:

[0013] A frameless motor, wherein the frameless motor is mounted inside the second housing portion;

[0014] A drive shaft is rotatably connected inside the second housing portion, the axis of the drive shaft extends along the second direction, and the first end of the drive shaft is drivenly connected to the output end of the frameless motor;

[0015] A first gear is connected to the second end of the transmission main shaft, and the axis of the first gear is parallel to the axis of the transmission main shaft; and

[0016] The second gear is connected to the grinding unit, and the axis of the second gear extends along the first direction.

[0017] In one embodiment, the polishing unit includes:

[0018] The clamping element is rotatably connected to the first housing portion; and

[0019] A grinding head, which is detachably connected to the clamping member, the clamping member having a first state of clamping the grinding head and a second state of releasing the grinding head.

[0020] In one embodiment, the clamping member is configured as a sleeve structure for fitting onto the outer wall of the grinding head;

[0021] The clamping component is provided with an open through groove along the axial direction, and locking holes are provided on both sides of the open through groove. Locking bolts are threaded into the locking holes.

[0022] In the first state, when the locking bolt is tightened, the opening slot becomes smaller, clamping the grinding head within the clamping member; in the second state, when the locking bolt is unlocked, the opening slot becomes larger, allowing the grinding head to be dislodged from the clamping member.

[0023] In one embodiment, the feed component includes:

[0024] A drive unit, rotatably connected to the first housing portion, and fixedly connected to the grinding head; and

[0025] The rotating external threaded part is fixedly connected to the driving part and is threadedly connected to the internal thread in the hole.

[0026] In one embodiment, the recycling mechanism further includes a recycling channel disposed on the polishing mechanism, and the dust suction port is disposed in the recycling channel;

[0027] The dust collection and transfer tube includes:

[0028] Main transfer tube, the main transfer tube being connected to the recovery dish; and

[0029] A flexible transfer tube, one end of which is connected to the end of the main transfer tube away from the recycling dish, and the other end of which extends into the recycling channel.

[0030] In one embodiment, the in-hole maintenance tool further includes a drive control mechanism electrically connected to the polishing assembly and the dust extraction drive, respectively, to control the operation of the polishing mechanism and the recycling mechanism.

[0031] In one embodiment, the drive control mechanism includes:

[0032] A control cabinet, which contains a controller, a motor driver, and a power supply mechanism. The controller is communicatively connected to the motor driver, and the motor driver is communicatively connected to the grinding assembly and the dust extraction drive component.

[0033] A female connector is mounted on the recycling mechanism and is used to supply power to the grinding assembly and the dust extraction drive.

[0034] A cable assembly that is detachably electrically connected between the power supply mechanism and the aircraft connector.

[0035] In one embodiment, the control cabinet includes:

[0036] Cabinet;

[0037] A display screen is disposed on the outer wall of the cabinet;

[0038] A physical button control panel is located on the outer wall of the cabinet and close to the display screen. The physical button control panel is communicatively connected to the controller and the display screen.

[0039] In one embodiment, the control cabinet further includes a cooling fan and a temperature sensor installed inside the cabinet, the temperature sensor being used to detect temperature signals inside the cabinet, and the cooling fan being communicatively connected to the temperature sensor; and / or

[0040] The cabinet is provided with heat dissipation holes, which are covered with dustproof plates.

[0041] According to the in-hole maintenance tool of this application embodiment, the feed component in the grinding mechanism provides precise feed force transmission, the grinding component provides efficient cutting capability, the grinding mechanism realizes the grinding function, and the recovery mechanism realizes the dust collection function. It is understood that the in-hole maintenance tool of this application embodiment is applicable to the removal of silver gaskets in the backflush holes of reactor RIC finger sleeve equipment, i.e., the grinding component is a silver gasket. The in-hole maintenance tool combines grinding and dust collection functions. The grinding function is responsible for breaking down the structure of the component to be ground, turning the entire component into multiple small pieces of debris. The dust collection function is used to suck the small pieces of debris into the recovery dish, preventing debris from entering the backflush hole and avoiding environmental pollution. Through the above settings, the efficiency of the forceful removal of silver gaskets is improved, the safety of the forceful removal work is ensured, the repair of the sealing surface is facilitated, and debris pollution is avoided. Attached Figure Description

[0042] Figure 1 This is a cross-sectional view of an in-hole maintenance tool according to an embodiment of this application.

[0043] Figure 2 This is a partial structural diagram of the grinding mechanism in an internal hole maintenance tool according to an embodiment of this application.

[0044] Figure 3 This is a schematic diagram of another part of the grinding mechanism in an internal hole maintenance tool according to an embodiment of this application.

[0045] Figure 4 This is a schematic diagram illustrating the structure of the first gear and the second gear in a hole maintenance tool according to an embodiment of this application.

[0046] Figure 5 This is a schematic diagram of the clamping component in a hole maintenance tool according to an embodiment of this application.

[0047] Figure 6 This is a schematic diagram of the main transmission pipe in an in-hole maintenance tool according to an embodiment of this application.

[0048] Figure 7 This is a schematic diagram of the structure of an in-hole maintenance tool according to an embodiment of this application, including a drive control mechanism.

[0049] Figure 8 This is a cross-sectional view of the control cabinet in an in-hole maintenance tool according to an embodiment of this application.

[0050] Figure label:

[0051] 1000. In-hole maintenance tools;

[0052] 100. Grinding mechanism;

[0053] 110. Feed assembly; 111. Drive unit; 112. Rotary external thread unit;

[0054] 120. Grinding assembly; 121. Grinding housing; 1211. First housing part; 1212. Second housing part; 12121. Start button; 122. Grinding unit; 1221. Clamping component; 12211. Opening through slot; 12212. Locking hole; 12213. Locking bolt; 1222. Grinding head; 12221. Nylon plug; 123. Grinding drive component; 1231. Frameless motor; 12311. Encoder; 1232. Transmission spindle; 1233. First gear; 1234. Second gear;

[0055] 200. Recycling mechanism; 210. Recycling container; 220. Suction transfer tube; 221. Suction port; 222. Main transfer tube; 223. Flexible transfer tube; 230. Suction drive component; 231. Handle; 240. Recycling channel;

[0056] 300. Drive control mechanism; 310. Control cabinet; 311. Cabinet body; 3111. Heat dissipation vents; 312. Display screen; 313. Physical button control panel; 314. Aviation connector interface; 315. Motor driver; 316. DV48V power supply; 317. DV24V power supply; 318. PLC; 319. Incoming contactor; 3191. Relay; 320. Aviation connector female. Detailed Implementation

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 a connection within 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.

[0061] 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.

[0062] 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.

[0063] Currently, judging from market trends, the application of borehole maintenance tools is becoming increasingly widespread. These tools are not only used for pipeline internal wall inspection and mechanical component duct maintenance, but also extensively applied in fields such as nuclear power equipment maintenance.

[0064] In the reactor RIC finger sleeve equipment, the backflushing tool is installed on the finger sleeve. When the silver gasket inside the RIC finger sleeve backflushing hole deforms due to long-term compression and cannot be removed by conventional methods, a special tool must be used for removal. Simultaneously, to ensure the integrity of the sealing surface inside the backflushing hole, when defects appear on the sealing surface, it needs to be ground and repaired. Therefore, there is an urgent need to invent a complete set of special tools for removing the silver gasket and repairing the sealing surface inside the RIC finger sleeve backflushing hole, to meet the spatial layout requirements of on-site operations and ensure the sealing reliability of the backflushing hole.

[0065] To alleviate the problems of low operating efficiency and easy system contamination by debris in confined spaces, the inventors discovered that the internal maintenance tool 1000 can be designed with integrated grinding and recycling functions.

[0066] Based on the above considerations, in order to solve the problem that traditional tools are limited by space and cannot simultaneously complete the debris recovery, the inventors, after in-depth research, designed an in-hole maintenance tool 1000. By setting a grinding mechanism 100 and a recovery mechanism 200 on the in-hole maintenance tool 1000, the debris can be recovered simultaneously when the part to be ground, such as a silver washer, is forcibly removed, which has the effect of improving work efficiency and avoiding system pollution.

[0067] In such an in-hole maintenance tool 1000, the grinding drive 123 of the grinding assembly 120 can accurately transmit cutting force, the rotating external thread 112 of the feed assembly 110 can provide stable feed force by using the in-hole thread guide, and the dust suction port 221 of the recycling mechanism 200 is close to the grinding area, forming an efficient debris recycling channel 240 with the main transmission pipe 222 and the flexible transmission pipe 223, thereby achieving efficient operation and safe maintenance in a confined space.

[0068] See Figure 1 and Figure 2At least one embodiment of this application provides an internal hole maintenance tool 1000, which includes a grinding mechanism 100 and a recovery mechanism 200. The grinding mechanism 100 includes a feed component 110 and a grinding component 120, which are drivenly connected. The feed component 110 provides a feed force to the grinding component 120 to abut against the workpiece to be ground. The grinding component 120 is used to grind the workpiece. The recovery mechanism 200 is connected to the grinding machine. The structure 100 is integrated, and the recycling mechanism 200 includes a recycling dish 210, a dust collection and transmission pipe 220, and a dust collection and driving component 230. One end of the recycling dish 210 is connected to the dust collection and transmission pipe 220, and the other end is connected to the dust collection and driving component 230. The dust collection and transmission pipe 220 is provided with a dust collection port 221, which is close to the grinding component 120. The dust collection and driving component 230 is used to generate suction so that the debris is sequentially recycled into the recycling dish 210 through the dust collection port 221 and the dust collection and transmission pipe 220.

[0069] According to the embodiment of this application, the in-hole maintenance tool 1000 includes a grinding mechanism 100 where the feed component 110 provides precise feed force transmission and the grinding component 120 provides efficient cutting capability. The grinding mechanism 100 performs the grinding function, and the recovery mechanism 200 performs the dust extraction function. It is understood that the in-hole maintenance tool 1000 of this application is applicable to the removal of silver gaskets inside the backflush holes of reactor RIC finger sleeve equipment, i.e., the grinding component is a silver gasket. The in-hole maintenance tool 1000 combines grinding and dust extraction functions. The grinding function is responsible for breaking down the structure of the component to be ground, turning the entire component into multiple small pieces of debris. The dust extraction function is used to suck the small pieces of debris into the recovery dish 210, preventing debris from entering the backflush hole and avoiding environmental pollution. Through the above configuration, the efficiency of the forceful removal of silver gaskets is improved, the safety of the forceful removal operation is ensured, the repair of the sealing surface is facilitated, and debris pollution is avoided.

[0070] In some embodiments, the in-hole maintenance tool 1000 also includes an industrial endoscope. The in-hole maintenance tool 1000 and the industrial endoscope work together to better complete the maintenance and repair of the backflush hole. Specifically, the industrial endoscope can be configured as a fiber optic endoscope or an electronic endoscope. Before operation, the industrial endoscope is inserted into the backflush hole to obtain high-definition images of the silver gasket deformation and the location of seal surface damage. Operators can then plan the grinding path and feed rate accordingly, avoiding blind operation. During grinding, the industrial endoscope continuously monitors the silver gasket removal progress and the seal surface repair status. After removal and repair are completed, the industrial endoscope delves into the hole to inspect the flatness of the seal surface and the presence of silver gasket residue, ensuring no metal shavings accumulate or seal surface defects, meeting the sealing requirements of the nuclear power system.

[0071] First, the space around the backflush port of the RIC finger sleeve is confined, with obstructions at the front ≤30mm and lateral spacing ≤100mm, making direct manual observation of the internal condition impossible. The fine-diameter probe of the industrial endoscope can be flexibly inserted into the hole, and when used with the 1000 hole maintenance tool, it enables coordinated visual positioning and precise feeding, avoiding secondary damage caused by tool collisions with the hole wall. Second, nuclear power plant RIC facilities pose radiation risks; the industrial endoscope reduces the time personnel spend working at close range, while real-time image transmission ensures the quality of the work.

[0072] See Figure 1 , Figure 2 and Figure 3 In some embodiments, the polishing assembly 120 includes a polishing housing 121, a polishing unit 122, and a polishing drive 123. The polishing unit 122 is rotatably connected to the polishing housing 121 and is used to polish the workpiece to be polished. The polishing drive 123 is drivenly connected to the polishing unit 122 and drives the polishing unit 122 to rotate.

[0073] Specifically, the polished outer shell 121 can be made of 6-series aluminum alloy, such as 6061 material. Stress simulation verification shows that its yield strength is ≥290MPa and it can withstand a maximum stress of 92.78MPa under a torque of 4.4Nm without deformation, providing rigid support.

[0074] See Figure 1 , Figure 2 and Figure 3 In some embodiments, the polishing housing 121 includes a first housing portion 1211 and a second housing portion 1212. The first housing portion 1211 extends along a first direction, and the polishing unit 122 is rotatably connected to the first housing portion 1211. The second housing portion 1212 extends along a second direction perpendicular to the first direction, and the polishing drive member 123 is disposed in the second housing portion 1212. The drive end of the polishing drive member 123 extends into the first housing portion 1211 and is drivenly connected to the polishing unit 122.

[0075] The first direction is the X direction in the diagram, and the second direction is the Y direction in the diagram.

[0076] See Figure 2 , Figure 3 and Figure 4In some embodiments, the grinding drive 123 includes a frameless motor 1231, a transmission spindle 1232, a first gear 1233, and a second gear 1234. The frameless motor 1231 is installed inside the second housing portion 1212. The transmission spindle 1232 is rotatably connected inside the second housing portion 1212, and the axis of the transmission spindle 1232 extends along the second direction. The first end of the transmission spindle 1232 is drivenly connected to the output end of the frameless motor 1231. The first gear 1233 is connected to the second end of the transmission spindle 1232, and the axis of the first gear 1233 is parallel to the axis of the transmission spindle 1232. The second gear 1234 is connected to the grinding unit 122, and the axis of the second gear 1234 extends along the first direction.

[0077] Specifically, the drive spindle 1232 can also be made of 6-series aluminum alloy. The hollow design of the drive spindle 1232 facilitates the insertion of the dust collection tube 220.

[0078] In some embodiments, the frameless motor 1231 is selected from the TBM2G series of BKO frameless motors, specifically model FMC09130, with a rated power of 1257W, a rated torque of 4.4Nm, and a rated speed of 300rpm. Through stress simulation analysis of the transmission spindle 1232, when the rated torque of the frameless motor 1231 is 4.4Nm, the maximum internal stress of the transmission spindle 1232 under the 4.4Nm torque condition is 92.78MPa, which is less than 290MPa, with a minimum safety factor of 3.1, thus meeting the usage requirements.

[0079] The diameter of the first gear 1233 is smaller than that of the second gear 1234, achieving right-angle transmission while providing cutting force to the grinding head 1222. Both the first gear 1233 and the second gear 1234 can be made of C45 carbon steel. Composed of the 20-tooth first gear 1233 and the 30-tooth second gear 1234, a 1.5:1 reduction ratio is formed, amplifying the motor torque to 4.62 to 5.94 Nm, converting it into a cutting force of 973 to 1251 N, far exceeding the 100 N removal force required for the silver washer. The output shaft of the frameless motor 1231 is directly connected to the drive spindle 1232, which is connected to the second gear 1234 via a key. The axis of the first gear 1233 extends along a second direction, and the axis of the second gear 1234 extends along a first direction. The first and second directions are perpendicular to each other, and the meshing of the first gear 1233 and the second gear 1234 achieves right-angle transmission. The second gear 1234 drives the main shaft of the grinding unit 122 to rotate via a spline, adapting to the axial space constraints of the backflushing hole. The power transmission path is sequentially: frameless motor 1231, transmission main shaft 1232, first gear 1233, second gear 1234, and grinding head 1222 of the grinding unit 122. Through the right-angle reversing characteristic of the bevel gear transmission unit, the axial rotational power of the frameless motor 1231 is converted into the vertical cutting power of the grinding head 1222, solving the transmission layout problem in the narrow space of the backflushing hole.

[0080] Analysis revealed that the main cutting force of the transmission spindle 1232 was verified and calculated, specifically as follows:

[0081] 1) Calculation of reducer torque

[0082]

[0083] Among them, T 电机 - The frameless motor has a rated power of 4.4 Nm, an i- transmission reduction ratio of 1.5:1, and an η- gear transmission efficiency of 0.7 to 0.9.

[0084]

[0085] 2) Formula for converting main cutting force

[0086]

[0087] Among them, D-tool diameter is 9.5mm, and coefficient 1000 is derived from millimeter to meter unit conversion.

[0088] 3) Calculation of main cutting force for silver washers

[0089] Pure silver is a soft metal, and its unit cutting force is significantly lower than that of steel and aluminum alloys.

[0090] Unit cutting force for aluminum:

[0091]

[0092] The cutting force of pure silver is typically 60% to 80% of that of aluminum. Assuming a unit cutting force of pure silver:

[0093]

[0094]

[0095] Where, α p - The depth of cut of the custom-made grinding head is 1mm. ƒ - The feed rate of the grinding mechanism is manually controlled, assuming a feed rate of 0.2mm / r.

[0096]

[0097] In summary, calculations show that the cutting force of the grinding mechanism is nearly 10 times greater than the cutting force required by the silver washer, and the grinding mechanism meets the grinding conditions for the silver washer.

[0098] In some embodiments, the first gear 1233 and the second gear 1234 are configured as bevel gears. Simulation of this set of bevel gears shows that the maximum torque of the frameless motor 1231 is 4.4 Nm, and the materials of the first gear 1233 and the second gear 1234 need to be carbon structural steel, with a maximum internal stress of 363 MPa, which is greater than 355 MPa. Considering that the cutting force required in actual applications is much less than nearly ten times the cutting force generated by the frameless motor 1231, the actual application will not cause damage to the first gear 1233 and the second gear 1234 due to the maximum stress. The minimum safety factor is 1, which meets the usage conditions.

[0099] In some embodiments, the grinding drive 123 further includes an encoder 12311 and a start button 1211. Specifically, the encoder 12311 is an ultra-thin absolute encoder. The start button 1211 is located on the outer wall of the grinding housing 121, and the grinding function of the grinding assembly 120 is turned on and off by the start button 1211, which is convenient for the operator to operate.

[0100] Specifically, encoder 12311 uses King Kong Technology's MBS series absolute encoder, model MBS-45-70, with an absolute positioning accuracy of ±0.05°, a maximum speed of 20000rpm, and an adaptable ambient temperature of -40 to 85℃.

[0101] See Figure 3 and Figure 5In some embodiments, the polishing unit 122 includes a clamping member 1221 and a polishing head 1222. The clamping member 1221 is rotatably connected to the polishing housing 121. The polishing head 1222 is detachably connected to the clamping member 1221. The clamping member 1221 has a first state of clamping the polishing head 1222 and a second state of releasing the polishing head 1222.

[0102] In some embodiments, the clamping member 1221 is configured as a sleeve structure for sleeved on the outer wall of the grinding head 1222; the clamping member 1221 is provided with an open through groove 12211 along the axial direction, and locking holes 12212 are provided on both sides of the open through groove 12211, and locking bolts 12213 are threadedly connected to the locking holes 12212; wherein, in the first state, when the locking bolts 12213 are locked, the open through groove 12211 becomes smaller, clamping the grinding head 1222 inside the clamping member 1221; in the second state, when the locking bolts 12213 are unlocked, the open through groove 12211 becomes larger, and the grinding head 1222 can be dislodged from the clamping member 1221.

[0103] Specifically, the clamping member 1221 is clamped to the end of the grinding head 1222. The locking bolt 12213 can be operated with an Allen wrench to switch between the first and second states of the clamping member 1221, thereby enabling the replacement of the grinding head 1222. The grinding head 1222 can be customized to be made of 7-series aerospace aluminum. The grinding head 1222 has a hollow structure inside, forming part of the recovery channel 240, facilitating the recovery of debris. A nylon plug 12221 is provided at the bottom of the grinding head 1222 to block the bottom hole in the backflush hole, preventing debris contamination of the nuclear power system.

[0104] In some embodiments, the feed assembly 110 includes a drive portion 111 and a rotating external thread portion 112. The drive portion 111 is rotatably connected to the first housing portion 1211 and fixedly connected to the grinding head 1222. The rotating external thread portion 112 is fixedly connected to the drive portion 111 and is threadedly connected to the internal thread in the hole.

[0105] Specifically, an M11*1 internal thread is provided in the backflush hole, which guides the rotation of the external thread 112 to generate a vertically downward feed force. The drive unit 111 can be operated manually or electrically driven. When the drive unit 111 is operated manually, an operating port can be provided at the corresponding position on the grinding housing 121 to facilitate the operator's hand insertion.

[0106] See Figure 1 and Figure 6In some embodiments, the recycling mechanism 200 further includes a recycling channel 240 disposed on the polishing mechanism 100, and a suction port 221 disposed in the recycling channel 240. The suction transmission pipe 220 includes a main transmission pipe 222 and a flexible transmission pipe 223. The main transmission pipe 222 is connected to the recycling dish 210; one end of the flexible transmission pipe 223 is connected to the end of the main transmission pipe 222 away from the recycling dish 210, and the other end extends into the recycling channel 240.

[0107] Specifically, the main transmission pipe 222 can be made of 6061 aluminum alloy, serving as a guide pipe for metal shavings recovery and preventing metal shavings from entering other areas inside the equipment. The flexible transmission pipe 223 can be configured as a transparent rubber tube, which, in conjunction with the right-angle turning position at the meshing point of the first gear 1233 and the second gear 1234 in the bevel gear transmission unit, enables the recovery of metal shavings at the corner, preventing the accumulation of debris. At the same time, using a transparent rubber tube also facilitates inspection and replacement.

[0108] In some other embodiments, the recycling mechanism 200 also includes a recycling tube disposed next to the polishing mechanism 100, with a dust suction port 221 disposed at the end of the recycling tube and close to the polishing assembly 120. One end of the flexible transfer tube 223 is connected to the end of the main transfer tube 222 away from the recycling dish 210, and the other end is connected to the recycling tube or extends into the recycling tube.

[0109] In some embodiments, the vacuum drive 230 may be configured as a vacuum motor, particularly a wet / dry separation vacuum motor. A handle 231 is provided on the outer wall of the vacuum motor for operator carrying and ease of use. The collection dish 210 is detachably connected to the grinding mechanism 100. After disassembling the collection dish 210 and the grinding mechanism 100, the collection dish 210 exposes a cleaning port for easy disposal of the collected metal shavings.

[0110] See Figure 7 In some embodiments, the hole maintenance tool 1000 further includes a drive control mechanism 300, which is electrically connected to the polishing assembly 120 and the dust extraction drive 230 to control the operation of the polishing mechanism 100 and the recycling mechanism 200.

[0111] See Figure 7 and Figure 8 In some embodiments, the drive control mechanism 300 includes a control cabinet 310, an aviation connector 320, and a cable. The control cabinet 310 is equipped with a controller, a motor driver 315, and a power supply mechanism. The controller is communicatively connected to the motor driver 315, and the motor driver 315 is communicatively connected to the grinding assembly 120 and the dust extraction drive 230, respectively. The aviation connector 320 is disposed on the recycling mechanism 200 and is used to supply power to the grinding assembly 120 and the dust extraction drive 230. The cable is detachably electrically connected between the power supply mechanism and the aviation connector 320.

[0112] Specifically, in this embodiment, AC220V AC power is used as the power supply. An AC / DC power module converts the input power into the corresponding voltage level required by the driver, controller, etc. The controller motor driver 315 operates, and the driver controls the equipment at the execution end, causing the grinding mechanism 100 and the recycling mechanism 200 to operate and complete the work process. The control cabinet 310 is connected to the grinding component 120 and the dust extraction drive component 230 using aviation plugs. The connection uses only one aviation plug interface 314, effectively reducing the on-site equipment assembly and connection time. The power interface and the aviation plug interface 314 are located on the same side, which can effectively reduce interference between cables during equipment use and effectively avoid the situation of messy external cables. The other side of the control cabinet 310 is equipped with a power button and equipment debugging interface to avoid equipment misoperation, reduce failure points, improve equipment working stability, and also enable direct and quick wiring and debugging of the equipment, avoiding the need to open the equipment box. The power supply mechanism uses AC220V / 50Hz AC power, and the power input interface uses a standard 220V / 10A power socket, which can adapt to most on-site power supply scenarios without the need for a separate power supply line. The power supply converts the incoming AC power into DC power of specifications such as DC48V and DC24V via an AC / DC module to power devices such as drivers and controllers. To meet usage requirements while taking into account safety, stability, and portability, the motor driver 315 is an integrated small servo motor driver 315, which can effectively control the rotational speed of the motor.

[0113] In some implementations, a DC48V power supply, a DC24V power supply 317, and an incoming contactor 319 are sequentially arranged along the width of the control cabinet 310. A relay 3191 is located at one end of the length of the control cabinet 310, and a programmable logic controller (PLC) 318 is located at the other end. The PLC 318 serves as the main control unit, working in conjunction with a motor driver 315, a cooling fan, and other components such as the relay 3191 to form the entire control system. A motor driver 315 is positioned between the incoming contactor 319 and the PLC 318. The control cabinet 310 features a compact design, minimizing space occupation and maximizing space utilization while ensuring adequate space for standardized installation and heat dissipation of all internal components. This reduces mechanical dimensions and overall weight.

[0114] Specifically, all components inside the control cabinet 310 are designed with a fixed structure, which can effectively reduce the probability of internal components falling off due to the equipment tipping over in case of an accident.

[0115] In some embodiments, the control cabinet 310 includes a cabinet body 311, a display screen 312, and a physical button control panel 313. The display screen 312 is disposed on the outer wall of the cabinet body 311; the physical button control panel 313 is disposed on the outer wall of the cabinet body 311 and close to the display screen 312, and the physical button control panel 313 is communicatively connected to the controller and the display screen 312 respectively. Specifically, the display screen 312 and the physical button control panel 313 are arranged on the top of the cabinet body 311, mainly for setting the speed of the grinding motor, setting the speed of the fan and controlling its start and stop, as well as a fault reset button, etc.

[0116] In some embodiments, the control cabinet 310 further includes a cooling fan and a temperature sensor installed inside the cabinet 311. The temperature sensor is used to detect the temperature signal inside the cabinet 311, and the cooling fan is communicatively connected to the temperature sensor. Specifically, the device automatically starts when it detects that the internal temperature of the cabinet 311 is higher than a certain value while the device is powered on, without human intervention, ensuring that the electrical equipment inside the cabinet 311 operates under a favorable ambient temperature.

[0117] In some embodiments, the cabinet 311 is provided with heat dissipation holes 3111, which are covered with dustproof plates. Specifically, the inlet and outlet of the cooling fan are designed with heat dissipation holes 3111, which are covered with dustproof plates. The dustproof plates are mesh-like, effectively preventing external foreign objects from entering the cabinet and affecting the operation of the devices.

[0118] The internal hole maintenance tool 1000 in this embodiment is suitable for internal hole maintenance work in confined spaces. It powerfully removes the silver gasket by grinding, and due to the characteristics of the grinding head 1222, it also protects the integrity of the sealing surface, achieving a repair effect. Compared with previous maintenance and repair methods, it takes less time. The specific operation process of the internal hole maintenance tool 1000 is as follows:

[0119] Preparation stage before grinding: This stage requires 1-2 people and takes 5 minutes. The operation procedure is as follows: Take out the grinding mechanism 100 and the recycling mechanism 200 integrated in the maintenance tool 1000 inside the hole from the packaging box, then take out the control cabinet 310, install the cable between the two, and then start the control cabinet 310 to complete the equipment connection and power-on preparation for the subsequent grinding operation, so that all components, such as the grinding drive component 123, are in a ready-to-work state.

[0120] Silver washer polishing stage: This stage requires 1-2 people and takes 10 minutes. The operation procedure is as follows: First, align the polishing head 1222 with the back-blowing hole opening and rotate the external thread 112 clockwise; when it is difficult to rotate the external thread 112, it indicates that the polishing head 1222 is in the working position. At this time, press the fan start / stop button of the control cabinet 310 and the start button 1211 at the same time to make the polishing drive component 123 drive the polishing unit 122 to start rotating and polishing; then rotate the external thread 112 clockwise again until it can no longer rotate, completing the silver washer polishing operation.

[0121] Finishing stage of polishing: This stage requires 1-2 people and takes 5 minutes. The operation procedure is as follows: Rotate the external thread part 112 counterclockwise while turning off the start button 1211 to stop the polishing unit 122 from rotating; then pull out the polishing head 1222 and check the condition of the back-blowing hole after the operation; finally, open the recovery dish 210, pour out the silver washer debris, and complete the final cleaning of the tool after use to prepare for the next operation.

[0122] It is understandable that there is a large redundancy in the time calculations for each stage. The efficiency of equipment disassembly and assembly, as well as the operator's proficiency, vary depending on the individual operator's ability, and the actual time consumed will fluctuate with the operator's skill level.

[0123] The hole maintenance tool 1000 provided in this application embodiment has core application value in the RIC plant environment of nuclear power plants. It can collect debris through the dust collection function when grinding silver gaskets, and use the nylon plug 12221 at the bottom of the grinding head 1222 to block the bottom hole of the backflush hole to prevent contamination of the nuclear power system. When used with an industrial endoscope, it can build a complete and smooth operation link, efficiently complete the powerful removal of the silver gasket of the backflush hole of the finger sleeve and the repair of the sealing surface during the overhaul of nuclear power plants, and provide technical support and guarantee for the stable operation and maintenance of related systems.

[0124] Manual removal of silver gaskets was time-consuming and inconsistent due to a lack of tools. In the past, maintenance of backflushing holes required more than a day. However, with the addition of the 1000-tool for hole maintenance, the maintenance and repair time for a single backflushing hole has been reduced to within half an hour. This reduces the overhaul and testing time of related systems in the RIC plant, allowing equipment to resume operation more quickly, reducing the power production interruption time caused by downtime maintenance, and thus increasing power generation duration and output, which has a positive effect on power plant productivity.

[0125] In the past, maintenance of backflush holes in RIC plants required multiple professionals to work together due to space constraints. This not only consumed a lot of human resources but also led to inefficiency due to personnel coordination issues. However, after the introduction of the hole maintenance tool 1000, only 1 to 2 operators are needed to complete the same task. The saved manpower can be redistributed to key maintenance links or production processes such as nuclear power plant control system testing and fine commissioning of power generation equipment, thereby optimizing the allocation of human resources, improving the overall maintenance level and operational efficiency of the power plant, and promoting productivity.

[0126] Nuclear power plant work is unique. When inspecting the backflush swirl holes in the RIC plant, maintenance personnel must wear protective clothing. While this provides protection, it limits operational flexibility and increases the risk of misoperation. The 1000 maintenance tool inside this hole has been optimized to effectively overcome this limitation. With its precise operability and convenient process, it significantly reduces the possibility of misoperation, improves the safety level of power plant maintenance, reduces downtime, maintenance costs and additional resource input caused by safety accidents, and provides support for improving power plant productivity.

[0127] 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.

[0128] The embodiments described above are merely illustrative of 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 hole maintenance tool, characterized in that, include: A grinding mechanism includes a feeding component and a grinding component. The feeding component is drivenly connected to the grinding component and provides a feeding force to the grinding component to abut against the workpiece to be ground. The grinding component is used to grind the workpiece to be ground. The grinding component includes a grinding housing, a grinding unit, and a grinding drive component. The grinding unit is rotatably connected to the grinding housing and is used to grind the workpiece to be ground. The grinding drive component is drivenly connected to the grinding unit and drives the grinding unit to rotate. The recycling mechanism is integrated with the polishing mechanism. The recycling mechanism includes a recycling dish, a suction transmission pipe, and a suction drive. One end of the recycling dish is connected to the suction transmission pipe, and the other end is connected to the suction drive. The suction transmission pipe has a suction port located near the polishing assembly. The suction drive generates suction to allow debris to be sequentially collected through the suction port and the suction transmission pipe into the recycling dish. The recycling mechanism also includes a recycling channel on the polishing mechanism, with the suction port located within the recycling channel. The suction transmission pipe includes a main transmission pipe and a flexible transmission pipe. The main transmission pipe is connected to the recycling dish. One end of the flexible transmission pipe is connected to the end of the main transmission pipe away from the recycling dish, and the other end extends into the recycling channel. A drive control mechanism is electrically connected to the polishing assembly and the dust extraction drive component to control the operation of the polishing mechanism and the recycling mechanism.

2. The hole maintenance tool according to claim 1, characterized in that, The polishing housing includes a first housing portion and a second housing portion. The first housing portion extends along a first direction, and the polishing unit is rotatably connected inside the first housing portion. The second housing portion extends along a second direction perpendicular to the first direction, and the polishing drive component is disposed inside the second housing portion. The drive end of the polishing drive component extends into the first housing portion and is drivenly connected to the polishing unit.

3. The hole maintenance tool according to claim 2, characterized in that, The grinding drive component includes: A frameless motor, wherein the frameless motor is mounted inside the second housing portion; A drive shaft is rotatably connected inside the second housing portion, the axis of the drive shaft extends along the second direction, and the first end of the drive shaft is drivenly connected to the output end of the frameless motor; A first gear is connected to the second end of the transmission main shaft, and the axis of the first gear is parallel to the axis of the transmission main shaft; and The second gear is connected to the grinding unit, and the axis of the second gear extends along the first direction.

4. The hole maintenance tool according to claim 2, characterized in that, The polishing unit includes: The clamping element is rotatably connected to the first housing portion; and A grinding head is detachably connected to the clamping member, which has a first state of clamping the grinding head and a second state of releasing the grinding head.

5. The hole maintenance tool according to claim 4, characterized in that, The clamping component is configured as a sleeve structure, used to be sleeved on the outer wall of the grinding head; The clamping component is provided with an open through groove along the axial direction, and locking holes are provided on both sides of the open through groove. Locking bolts are threaded into the locking holes. In the first state, when the locking bolt is tightened, the opening slot becomes smaller, clamping the grinding head within the clamping member; in the second state, when the locking bolt is unlocked, the opening slot becomes larger, allowing the grinding head to be dislodged from the clamping member.

6. The in-hole maintenance tool according to claim 4, characterized in that, The feed assembly includes: A drive unit, rotatably connected to the first housing portion, and fixedly connected to the grinding head; and The rotating external threaded part is fixedly connected to the driving part and is threadedly connected to the internal thread in the hole.

7. The hole maintenance tool according to claim 1, characterized in that, The drive control mechanism includes: A control cabinet, which contains a controller, a motor driver, and a power supply mechanism. The controller is communicatively connected to the motor driver, and the motor driver is communicatively connected to the grinding assembly and the dust extraction drive component. A female connector is mounted on the recycling mechanism and is used to supply power to the grinding assembly and the dust extraction drive. A cable assembly that is detachably electrically connected between the power supply mechanism and the aircraft connector.

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