Arcuate surface directional hole positioning tool for nuclear power plant maintenance

Abstract

The application relates to a curved surface directional hole positioning tool for nuclear power plant maintenance, which comprises a clamping piece, a directional ball, a fixing piece and a guide pipe, the clamping piece is provided with a clamping channel matched with a to-be-holed piece; the clamping piece is also provided with a positioning hole; the directional ball is spherical and is provided with a mounting channel; the directional ball is rotationally arranged in the positioning hole; the fixing piece is capped on the directional ball and is connected with the clamping piece; the guide pipe is arranged in the mounting channel; the guide pipe is provided with a through hole for a hole tool to pass through; the application can avoid the problem that the hole tool slips during hole drilling on a curved surface and causes the hole center to deviate; and the guide pipe with different through hole diameters can be replaced to meet the requirements of different hole diameters. For different hole angles, a prefabricated tool is not needed, the tool does not need to be replaced, and only the angle of the directional ball needs to be adjusted, so that time consumption, manpower consumption and cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of nuclear power plant maintenance technology, and in particular to an arc-shaped surface directional opening positioning tool for nuclear power plant maintenance. Background Technology

[0002] Numerous operations involving drilling into curved surfaces occur during nuclear power plant maintenance. For example, instrumentation work requires drilling holes in pressure pipelines to install sampling interfaces, and chemical testing also requires drilling sampling holes in pressure pipelines to install sampling interfaces. Electrical work, such as replacing the generator rotor excitation brush slip rings, also requires drilling positioning holes in the generator rotor shaft. Mechanical work involving installing branch pipes on main pipelines requires drilling diversion holes in the main pipeline; large flanges require drilling and tapping threads on their outer surfaces to install lifting lugs; and some mechanical support connections also require drilling holes at different angles at different locations on the same sphere. Many curved surfaces require drilling operations.

[0003] In related technologies, when drilling holes on curved surfaces, the vertical drilling method involves using a center punch to mark a point radially and vertically at the desired drilling location, followed by drilling with a hand drill and a suitable drill bit. During this process, the operator must constantly monitor and control the drill bit's direction, relying entirely on their skill level. Even slight errors can cause the drill bit to deviate, resulting in unsuccessful directional drilling and potential equipment damage. For drilling on inclined surfaces, prefabricated fixtures need to be fabricated in advance according to the required inclination and diameter parameters. These fixtures are then placed at the desired drilling location on-site. However, in nuclear power plant maintenance operations, there are numerous tasks with inconsistent diameters and drilling angles. Prefabricating fixtures in advance is time-consuming and costly. Utility Model Content

[0004] This application provides a directional drilling positioning tool for arc-shaped surfaces used in nuclear power plant maintenance, which solves the problem of slippage and displacement of the drilling center when drilling on arc-shaped surfaces, and avoids the time, manpower and cost of prefabricated tooling.

[0005] This application provides a curved surface directional opening positioning tool for nuclear power plant maintenance, comprising:

[0006] The clamping member has a clamping channel that mates with the part to be drilled; the clamping member also has a positioning hole that communicates with the clamping channel;

[0007] A directional ball has a mounting channel that passes through it; the directional ball is located on the outside of the clamping member, and the mounting channel corresponds to the positioning hole.

[0008] A fixing member, connected to the clamping member, has a locked state and an unlocked state. In the locked state, it presses against the directional ball, fixing the directional ball relative to the clamping member. In the unlocked state, the directional ball can be adjusted in position relative to the clamping member, thereby adjusting the angle between the axis of the mounting channel and the axis of the clamping channel. The fixing member has a clearance hole communicating with the mounting channel. The diameter of the clearance hole is larger than the diameter of the mounting channel.

[0009] A guide tube is inserted into the installation channel; the guide tube has a through hole for a drilling tool to pass through; the through hole passes through the guide tube and communicates with the clamping channel.

[0010] Furthermore, the wall of the installation channel is provided with a limiting protrusion; one end of the guide tube near the clamping channel abuts against the limiting protrusion.

[0011] Furthermore, the limiting protrusion extends circumferentially along the wall of the mounting channel to form a ring.

[0012] Furthermore, there are multiple limiting protrusions, and these multiple limiting protrusions are distributed at intervals along the circumferential direction of the wall of the mounting channel.

[0013] Furthermore, the fastener includes:

[0014] A limiting part is pressed against the directional ball; the limiting part is provided with a limiting cavity to accommodate the directional ball; the shape of the cavity wall of the limiting cavity is adapted to the directional ball; the clearance hole is formed in the limiting part and communicates with the limiting cavity;

[0015] The connecting part is connected to the limiting part, and the connecting part is connected to the clamping member by a fastener.

[0016] Furthermore, the clamping member includes:

[0017] A first clamping part is connected to the first clamping part, and the positioning hole is provided in the first clamping part;

[0018] The second clamping part, together with the first clamping part, forms the clamping channel; one end of the second clamping part is rotatably connected to one end of the first clamping part, and the other end of the second clamping part is detachably connected to the other end of the first clamping part.

[0019] Furthermore, the first clamping portion and / or the second clamping portion are semi-circular.

[0020] Furthermore, it also includes a locking element, which is movably disposed on the fixing element to operably lock the guide tube in the installation channel.

[0021] Furthermore, the outer wall of the guide tube is provided with a locking hole;

[0022] The locking component includes:

[0023] A support base is provided on the side of the fixing member opposite to the directional ball; the support base is provided with a threaded hole; the threaded hole is provided corresponding to the locking hole;

[0024] A locking rod passes through the threaded hole and is threadedly connected to the support base;

[0025] The locking rod can be moved to be inserted into the locking hole to lock the guide tube.

[0026] Furthermore, the diameter of the positioning hole is larger than the diameter of the mounting channel, and the directional ball is partially embedded in the positioning hole.

[0027] The technical solution provided in this application has the following advantages:

[0028] In this application's technical solution, a clamping component stably holds the workpiece to be drilled, preventing displacement during drilling operations and ensuring optimal drilling results. The drilling angle can be adjusted by rotating a guide ball, adapting to different angle requirements and improving applicability. After the guide ball angle is adjusted, a fixing component presses the guide ball to secure its position. The diameter of the clearance hole on the fixing component is larger than the diameter of the mounting channel, reducing the problem of the mounting channel being obstructed by the fixing component when the guide ball rotates to different angles. A guide tube is installed within the mounting channel, providing positioning and guidance for the drilling tool, preventing slippage and center displacement when drilling on curved surfaces. Furthermore, by replacing guide tubes with different through-hole diameters, different drilling diameter requirements can be accommodated. This application eliminates the need for prefabricated tooling and tool replacement for different drilling angles; only the angle of the guide ball needs adjustment, reducing time, manpower, and costs. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0032] Figure 1 This application provides a schematic diagram of the structure of an arc-shaped surface directional opening positioning tool for nuclear power plant maintenance.

[0033] Figure 2 for Figure 1 A schematic diagram of the structure of the directional ball;

[0034] Figure 3 for Figure 1 Schematic diagram of the middle fixing component;

[0035] Figure 4 for Figure 1 A schematic diagram of the structure of the first clamping part;

[0036] Figure 5 for Figure 1 A schematic diagram of the structure of the second clamping part;

[0037] Figure 6 for Figure 1 A schematic diagram of the structure of the guide tube.

[0038] Explanation of reference numerals in the attached figures:

[0039] Clamping component 1, clamping channel 1a, positioning hole 1b, first clamping part 11, first mounting ear 111, first mounting hole 111a, fastening hole 111b, second clamping part 12, second mounting ear 121, second mounting hole 121a, rotating part 13.

[0040] Orientation ball 2, installation channel 2a, limiting protrusion 21,

[0041] Fixing member 3, clearance hole 3a, limiting part 31, limiting cavity 31a, connecting part 32, connecting hole 32a, fastener 33, rod part 331, locking part 332.

[0042] Guide tube 4, through hole 4a, lock hole 4b

[0043] 5. Locking component 5, support base 51, locking rod 52. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0046] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0047] To address the technical problems in existing technologies where slippage occurs during drilling on curved surfaces, leading to borehole center misalignment, and where inconsistent borehole diameters and angles necessitate the prefabrication of multiple prefabricated fixtures, resulting in significant time consumption and cost waste, this application provides a directional drilling positioning tool for curved surfaces used in nuclear power plant maintenance. This tool effectively prevents slippage and borehole center misalignment during drilling operations on curved surfaces. Furthermore, by replacing guide tubes with different through-hole diameters, it can adapt to varying borehole diameter requirements. For different borehole angles, this application eliminates the need for prefabricated fixtures and tool replacements; only the angle of the directional ball needs adjustment, reducing time, manpower, and costs.

[0048] Figures 1 to 6 An arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance is provided in this application embodiment. It includes a clamping member 1, a directional ball 2, a fixing member 3, and a guide tube 4. The clamping member 1 has a clamping channel 1a that cooperates with the part to be drilled. The clamping member 1 makes the part to be drilled stable and prevents the part to be drilled from shifting during the drilling operation, which would affect the drilling effect.

[0049] The clamping member 1 also has a positioning hole 1b communicating with the clamping channel 1a; the directional ball 2 is spherical and has an installation channel 2a through which it passes; the directional ball 2 is located outside the clamping member 1 and is rotatably positioned in the positioning hole 1b so that the installation channel 2a communicates with the clamping channel 1a; the shape of the hole wall of the positioning hole 1b is adapted to the shape of the end of the positioning ball inserted into the positioning hole 1b. In this way, the angle of the positioning ball can be infinitely adjusted. By rotating the directional ball 2, the opening angle can be adjusted to adapt to different angle requirements and improve applicability.

[0050] The fixing member 3 presses against the directional ball 2 and connects to the clamping member 1; the fixing member 3 is provided with a clearance hole 3a communicating with the mounting channel 2a; after the angle of the directional ball 2 is adjusted to the correct position, the fixing member 3 presses the directional ball 2 to fix its position. The diameter of the clearance hole 3a is larger than the diameter of the mounting channel 2a; the larger diameter of the clearance hole 3a on the fixing member 3 reduces the problem of the mounting channel 2a being blocked by the fixing member 3 when the directional ball 2 rotates to different angles;

[0051] The guide tube 4 is installed within the mounting channel 2a; the guide tube 4 has a through hole 4a for the drilling tool to pass through; the through hole 4a penetrates the guide tube 4 and communicates with the clamping channel 1a. It can be understood that by installing the guide tube 4 within the mounting channel 2a, the guide tube 4 can position and guide the drilling operation of the drilling tool, preventing slippage of the drilling tool on curved surfaces and thus avoiding the problem of drill center offset; furthermore, by replacing the guide tube 4 with one of different through hole 4a diameters, it can adapt to different drilling diameter requirements.

[0052] The fastener has a locked state and an unlocked state. In the locked state, the fastener presses against the directional ball, fixing the directional ball relative to the clamping member. In the unlocked state, the directional ball can be adjusted relative to the clamping member, thereby adjusting the angle between the axis of the mounting channel and the axis of the clamping channel.

[0053] This application eliminates the need for prefabricated tooling and tool changes for different opening angles; only the angle of the directional ball 2 needs to be adjusted, which reduces time consumption, manpower consumption, and costs.

[0054] For example, the hole-making tool is an electric drill, the diameter of the through hole 4a is adapted to the size of the drill bit, the drill bit is inserted into the through hole 4a and abuts against the hole-making part, and the rotating drill bit can perform hole-making operation on the part to be holed.

[0055] Since the rotation of the drill bit will cause wear on the hole wall of the through hole 4a, the detachable guide tube 4 is provided in this application so that the guide tube 4 can be easily replaced. Other parts of the entire arc-shaped surface directional hole positioning tool do not need to be replaced, which can reduce waste.

[0056] like Figure 1 and Figure 2 As shown, in some embodiments, the wall of the mounting channel 2a is provided with a limiting protrusion 21; the end of the guide tube 4 near the clamping channel 1a abuts against the limiting protrusion 21. Thus, the limiting protrusion 21 can limit the installation of the guide tube 4, preventing it from being inserted into the clamping channel 1a. During the insertion of the guide tube 4 into the mounting channel 2a, when the guide tube 4 abuts against the limiting protrusion 21, it indicates that the guide tube 4 is installed in place.

[0057] To ensure the stability of the guide tube 4, in some embodiments, the limiting protrusion 21 extends circumferentially along the wall of the mounting channel 2a to form a ring. In other embodiments, there are multiple limiting protrusions 21, which are spaced apart circumferentially along the wall of the mounting channel 2a.

[0058] like Figure 1 and Figure 3 As shown, in some embodiments, the fixing member 3 includes a limiting part 31 and a connecting part 32. The limiting part 31 presses against the directional ball 2. The limiting part 31 is provided with a limiting cavity 31a for accommodating the directional ball 2 and a clearance hole 3a. The shape of the cavity wall of the limiting cavity 31a is adapted to the directional ball 2. The clearance hole 3a communicates with the limiting cavity 31a. The connecting part 32 is connected to the limiting part 31, and the connecting part 32 is connected to the clamping member 1 by a fastener 33.

[0059] Understandably, the limiting part 31 applies a force to the directional ball 2, fixing the position of the directional ball 2 after the angle is adjusted, preventing it from rotating. The connecting part 32 provides a locking force to the limiting part 31, and the connecting part 32 is fixed to the clamping member 1 by the fastener 33.

[0060] In this embodiment, the fixing member 3 is made of steel. The directional ball 2 is made of steel. The guide tube 4 is made of steel.

[0061] like Figure 1 and Figure 3As shown, in some embodiments, there are multiple connecting portions 32, which are evenly distributed along the circumference of the limiting portion 31. This improves the stability of the fixing member 3 in fixing to the clamping member 1, thereby improving the positional stability of the directional ball 2. In this embodiment, there are two connecting portions 32, which are symmetrically connected to opposite sides of the limiting portion 31.

[0062] In this embodiment, the connecting part 32 is provided with a connecting hole 32a, and the clamping member 1 is provided with a fastening hole 111b, which is correspondingly provided with the connecting hole 32a. The fastener 33 includes a rod part 331 and a locking part 332. The rod part 331 is provided with external threads, and the locking part 332 is threadedly connected to the rod part 331. The fastening hole 111b and the connecting hole 32a are provided with internal threads. The rod part 331 passes through the connecting hole 32a and is inserted into the connecting hole 32a. By tightening the locking part 332, the connecting part 32 and the clamping member 1 can be locked and fixed.

[0063] In this embodiment, the locking part is a wing nut at position 332.

[0064] like Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, the clamping member 1 includes a first clamping part 11 and a second clamping part 12. The first clamping part 11 is provided with a positioning hole 1b; the fixing member 3 is connected to the first clamping part 11; the second clamping part 12 and the first clamping part 11 enclose to form a clamping channel 1a; one end of the second clamping part 12 is rotatably connected to one end of the first clamping part 11, and the other end of the second clamping part 12 is detachably connected to the other end of the first clamping part 11. This facilitates the assembly of the clamping member 1 with the part to be drilled.

[0065] In this embodiment, the first clamping part 11 and the second clamping part 12 are connected by a rotating part 13. For example, the rotating part 13 is a pin, and the pin is provided with an assembly hole. A spring clip is inserted into the assembly hole to prevent the pin from falling off.

[0066] In this embodiment, the first clamping part 11 is provided with a first mounting ear 111, and the first mounting ear 111 is provided with a first mounting hole 111a; the second clamping part 12 is provided with a second mounting ear 121, and the second mounting ear 121 is provided with a second mounting hole 121a; the first mounting ear 111 and the second mounting ear 121 are correspondingly arranged, and the first mounting hole 111a and the second mounting hole 121a are correspondingly arranged. The first mounting ear 111 and the second mounting ear 121 are locked by fasteners 33 passing through the first mounting hole 111a and the second mounting hole 121a, and can also be easily disassembled.

[0067] In this embodiment, the first clamping part 11 and the second clamping part 12 are each semi-circular, forming a circular clamping channel 1a. Both the first clamping part 11 and the second clamping part 12 are made of steel.

[0068] To prevent the guide tube 4 from rotating when the drilling tool is inserted into it for drilling operations, such as Figure 1 and Figure 6 As shown, in some embodiments, the arc-shaped surface directional opening positioning tool further includes a locking member 5, which is movably disposed on the fixing member 3 and is used to lock the guide tube 4.

[0069] like Figure 1 and Figure 6 As shown, in some embodiments, the outer wall of the guide tube 4 is provided with a locking hole 4b;

[0070] The locking component 5 includes a support base 51 and a locking rod 52. The support base 51 is located on the side of the fixing component 3 opposite to the directional ball 2. The support base 51 has a threaded hole, which corresponds to the locking hole 4b. The locking rod 52 has external threads, which pass through the threaded hole and are threadedly connected to the support base 51. The locking rod 52 can be moved to insert into the locking hole 4b to lock the guide tube 4. The locking rod 52 can also be moved in the opposite direction to withdraw from the locking hole 4b to unlock the guide tube 4.

[0071] Understandably, the support base 51 and the locking rod 52 provide installation support. After the locking rod 52 is inserted into the lock hole 4b, the locking rod 52 and the lock hole 4b are fixedly connected. Under the limitation of the locking rod 52, the guide tube 4 will not rotate or fall out of the installation channel 2a.

[0072] like Figure 1 and Figure 6 As shown, in some embodiments, there are multiple locking holes 4b, which are evenly spaced along the circumference of the guide tube 4; there are multiple threaded holes, which are provided in a one-to-one correspondence with the locking holes 4b; and there are multiple locking rods 52, which are connected in a one-to-one correspondence with the threaded holes. In this way, the positional stability of the guide tube 4 can be improved.

[0073] like Figure 1 As shown, in some embodiments, the diameter of the positioning hole is larger than the diameter of the mounting channel, and the directional ball is partially embedded in the positioning hole. This ensures that the directional ball fits snugly against the wall of the positioning hole and that the clamping member does not interfere with the drilling operation.

[0074] according to Figure 1 Assemble as shown:

[0075] 1. The end of the first clamping part 11 away from the first mounting ear 111 is aligned with the end of the second clamping part 12 away from the second mounting ear 121, and then connected by the rotating part 13 (pin). It can rotate along the pin, and the pin is fixed by a spring clip to prevent it from coming out. After assembly, the first clamping part 11 and the second clamping part 12 can form a ring, and the clamping part 1 is assembled.

[0076] 2. Install the rod 331 into the connecting hole 32a. Place the directional ball 2 with the side near the limiting protrusion 21 facing the positioning hole 1b. Use the fixing part 3 to press the directional ball 2 down, and use the locking part 332 to fix the fixing part 3 through the threaded rod. The rotation of the directional ball 2 can be controlled by the locking part 332. The installation of the directional ball 2 is complete. Confirm that all connections are complete.

[0077] The following describes how to use this application in conjunction with the accompanying drawings:

[0078] This application shall be in accordance with Figure 1 After assembly, check that the first clamping part 11 and the second clamping part 12 can rotate along the rotating part 13 without falling off. Under the action of the fixing part 3, the directional ball 2 can adjust the locking part 332 to achieve rotation or locking.

[0079] Determine the location where a hole needs to be drilled in the pipe (or sphere). Align the first mounting hole 111a of the first clamping part 11 of the arc-shaped surface directional drilling positioning tool with the second mounting hole 121a of the second clamping part 12. Insert and adjust the fastener 33. Determine the required hole diameter, select a suitable guide tube 4, and insert the guide tube 4 into the installation channel 2a until it is pushed to the abutment of the limiting protrusion 21. Adjust the axis center of the guide tube 4 to align with the location where the hole needs to be drilled (the drilling angle can be adjusted by adjusting the angle of the directional ball 2). After confirming the drilling position and angle, tighten all fasteners 33 and ensure that the position and angle of the guide tube 4 have not changed.

[0080] The operator can start the electric drill by inserting the prepared drill bit into the guide tube 4 and then complete the hole-opening operation.

[0081] By selecting guide tubes with different inner diameters and matching them with drill bits of different diameters, drilling operations of different diameters can be completed.

[0082] This application enables direct drilling operations of different sizes and angles on curved surfaces without the need for prefabricated tooling, and requires no special familiarity from the operators. The inner diameter of the guide tube 4 can be selected as needed, and the drilling operation is completed by adjusting the angle of the directional ball 2. It is convenient to use; each time drilling is performed on a curved surface, only one set of this application needs to be brought to the site. By selecting guide tubes 4 with different inner diameters and adjusting the angle of the directional ball 2, drilling operations of various sizes and angles can be completed. This saves manpower and time, eliminates the need to prefabricate multiple tooling sets and bring them to the work site, avoids the risk of leaving them as foreign objects on the equipment, and reduces waste. After the operation is completed, the tooling can be stored for later use, saving space.

[0083] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0084] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0085] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0086] 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 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0087] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0089] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0090] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A curved surface directional drilling positioning tool for nuclear power plant maintenance, characterized in that, include: The clamping member (1) has a clamping channel (1a) that mates with the part to be drilled; the clamping member (1) is also provided with a positioning hole (1b) that communicates with the clamping channel (1a); The directional ball (2) has an installation channel (2a) through it; the directional ball (2) is located on the outside of the clamping member (1), and the installation channel (2a) corresponds to the positioning hole (1b); A fixing member (3) is connected to the clamping member (1) and has a locked state and an unlocked state. In the locked state, it presses against the directional ball (2), fixing the directional ball (2) relative to the clamping member (1). In the unlocked state, the directional ball (2) can be adjusted relative to the clamping member (1), thereby adjusting the angle between the axis of the mounting channel (2a) and the axis of the clamping channel. The fixing member (3) has a clearance hole (3a) communicating with the mounting channel (2a). The diameter of the clearance hole (3a) is larger than the diameter of the mounting channel (2a). A guide tube (4) is inserted into the installation channel (2a); the guide tube (4) is provided with a through hole (4a) for the drilling tool to pass through; the through hole (4a) passes through the guide tube (4) and communicates with the clamping channel (1a).

2. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 1, characterized in that, The wall of the installation channel (2a) is provided with a limiting protrusion (21); the end of the guide tube (4) near the clamping channel (1a) abuts against the limiting protrusion (21).

3. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 2, characterized in that, The limiting protrusion (21) extends circumferentially along the wall of the mounting channel (2a) to form a ring.

4. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 2, characterized in that, The number of the limiting protrusions (21) is multiple, and the multiple limiting protrusions (21) are distributed at intervals along the circumferential direction of the wall of the installation channel (2a).

5. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 1, characterized in that, The fastener (3) includes: A limiting part (31) is pressed against the directional ball (2); the limiting part (31) is provided with a limiting cavity (31a) for accommodating the directional ball (2), the shape of the cavity wall of the limiting cavity (31a) being adapted to the directional ball (2); the clearance hole (3a) is formed in the limiting part (31) and communicates with the limiting cavity (31a); and The connecting part (32) is connected to the limiting part (31), and the connecting part (32) is connected to the clamping member (1) by a fastener (33).

6. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 1, characterized in that, The clamping member (1) includes: A first clamping part (11) is connected to the fixing member (3), and the positioning hole (1b) is provided in the first clamping part (11); and The second clamping part (12) surrounds the first clamping part (11) to form the clamping channel (1a); one end of the second clamping part (12) is rotatably connected to one end of the first clamping part (11), and the other end of the second clamping part (12) is detachably connected to the other end of the first clamping part (11).

7. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 6, characterized in that, The first clamping part (11) and / or the second clamping part (12) are semi-circular.

8. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 1, characterized in that, It also includes a locking element (5), which is movably disposed on the fixing element (3) to operably lock the guide tube (4) in the installation channel (2a).

9. The arc-shaped surface directional drilling positioning tool for nuclear power plant maintenance according to claim 8, characterized in that, The outer wall of the guide tube (4) is provided with a lock hole (4b); The locking element (5) includes: A support base (51) is provided on the side of the fixing member (3) away from the directional ball (2); the support base (51) is provided with a threaded hole; the threaded hole is provided in correspondence with the locking hole (4b); The locking rod (52) passes through the threaded hole and is threadedly connected to the support base (51); The locking rod (52) is movable to be inserted into the locking hole (4b) to lock the guide tube (4).

10. The arc-shaped surface directional opening positioning tool for nuclear power plant maintenance according to any one of claims 1 to 9, characterized in that, The diameter of the positioning hole (1b) is larger than the diameter of the mounting channel (2a), and the directional ball (2) is partially embedded in the positioning hole (1b).

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