Waterproof and antirust cap of self drilling screw and self drilling screw

Abstract

The utility model relates to the technical field of fasteners, and provides a self drilling screw waterproof rust-proof cap and a self drilling screw, the self drilling screw waterproof rust-proof cap comprises a cap body, the cap body is provided with an accommodating cavity, the accommodating cavity is hexagonal, and the outer side of the cap body is a regular hexagon. By means of the technical scheme, the problem that in the prior art, a waterproof and rust-proof cap of a self drilling screw is poor in universality is solved.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, specifically to a waterproof and rust-proof cap for a self-drilling screw and a self-drilling screw thread. Background Technology

[0002] In many fields such as construction and industrial manufacturing, the protection of drill wires is of paramount importance. However, traditional drill wire protection methods and related products have many defects and shortcomings.

[0003] Early protective methods often involved simply applying paint or grease to the surface of the self-drilling wire. While paint could provide some protection against air and moisture, the paint layer was easily worn away and scratched, leading to protective failure. Furthermore, the painting process was difficult to ensure uniformity; areas with excessively thin or thick paint layers would affect the protective effect and the appearance of the self-drilling wire. Grease application, on the other hand, was prone to attracting dust and impurities and was easily washed away in high-temperature or humid environments, failing to provide long-term stable protection and requiring frequent reapplication, increasing maintenance costs and workload.

[0004] With technological advancements, some simple nut-type protective devices have emerged. However, these nuts are typically injection molded, meaning their shape and size are limited by specific molds during production, allowing them to match only specific sizes of self-drilling screws. In practical applications, such as large-scale construction projects or integrated industrial production workshops, multiple sizes of self-drilling screws are often used. This necessitates stocking large quantities of protective nuts of different models, increasing the complexity and cost of inventory management. Furthermore, if the specifications of the self-drilling screw change slightly, or if a different specification needs to be temporarily replaced due to special requirements, the existing injection-molded nuts become unusable, resulting in extremely poor flexibility and severely hindering construction and production efficiency.

[0005] Traditional protective nuts also present inconveniences in terms of installation and removal. Some injection-molded nuts are connected too tightly to the self-drilling screw, requiring significant external force during installation and easily damaging the self-drilling screw or the protective nut itself. When disassembly is needed for maintenance, replacement of the self-drilling screw, or other operations, they are often difficult to remove smoothly due to overly tight connections or nut deformation, causing problems for subsequent work.

[0006] Furthermore, traditional protective nuts are not durable in terms of protective performance. Nuts exposed to natural or industrial environments for extended periods are subject to various factors such as ultraviolet radiation, acid and alkaline gases, and mechanical vibration. Injection-molded nuts may become brittle and crack due to material aging, thus losing their protective function for the drill bit, leading to rust and corrosion of the drill bit, affecting its connection strength and service life, and ultimately endangering the safety and stability of the entire building structure or industrial equipment. Utility Model Content

[0007] This utility model proposes a waterproof and rust-proof cap for self-drilling screws and a self-drilling screw, which solves the problem of poor versatility of waterproof and rust-proof caps for self-drilling screws in related technologies.

[0008] The technical solution of this utility model is as follows:

[0009] A waterproof and rust-proof cap for a self-drilling screw includes:

[0010] The cap body has a cavity, which is hexagonal, and the outer side of the cap body is a regular hexagon.

[0011] As a further technical solution, the cavity has an inlet and a first protrusion, the first protrusion being located circumferentially to the inlet.

[0012] As a further technical solution, the cavity has a tapered portion, and the tapered portion and the first protrusion are respectively located on the inner and outer sides of the inlet.

[0013] A self-drilling screw, including a waterproof and rust-proof cap for the self-drilling screw, and further comprising:

[0014] A self-drilling screw, the self-drilling screw having a nail portion and a nut portion, the nut portion being hexagonal, the cavity being used to accommodate the nut portion, the nut portion having a cross-sectional area greater than or equal to that of the nut body.

[0015] As a further technical solution, the nut portion has a variable diameter portion, and the tapered portion is used to accommodate the variable diameter portion.

[0016] As a further technical solution, the end of the nut portion has a groove.

[0017] As a further technical solution, the cap body is a hot-melt cap body.

[0018] As a further technical solution, the variable diameter part has a transition part, the transition part has an abutting end, the abutting end is used to abut against the outside, and the transition part is used for the transition connection between the nut part and the abutting end.

[0019] As a further technical solution, the transition portion is tapered.

[0020] As a further technical solution, the cross-sectional area of ​​the transition portion is larger than the cross-sectional area of ​​the nut portion.

[0021] The working principle and beneficial effects of this utility model are as follows:

[0022] In this embodiment of the invention, the cavity of the cap is designed to be hexagonal, a shape that allows for a tight and precise match with the common hexagonal screw head. In practical use, when the waterproof and rust-proof cap is installed on the self-drilling screw, the hexagonal cavity fits the screw head well, ensuring the cap is securely fitted and preventing loosening, rotation, or detachment. The hexagonal cavity design facilitates installation. Operators can use tools to tap the cap onto the self-drilling screw. The hexagonal outer shape of the cap ensures that installation does not interfere with the operation of the self-drilling screw, and the hexagonal shape allows for easy clamping and operation using tools such as wrenches.

[0023] Because the cap's cavity fits snugly against the screw head and its hexagonal outer surface facilitates installation and fixation, the waterproof and rustproof cap forms a relatively closed and stable protective structure after installation. This effectively prevents external moisture, air, and other corrosive media from contacting the screw.

[0024] The overall hexagonal structure of the cap and the design of the internal hexagonal cavity give it good stability when subjected to external forces. Whether subjected to external impacts, vibrations, or long-term pressure, this waterproof and rustproof cap is not easily deformed or cracked.

[0025] The hexagonal cavity design of this waterproof and rust-proof cap allows it to accommodate a wide variety of self-drilling screws of different sizes but with hexagonal heads. In actual industrial production and construction installation, various sizes of self-drilling screws exist. This hexagonal cavity waterproof and rust-proof cap, as long as its size is within a reasonable range, can be widely used for different sizes of hexagonal self-drilling screws, improving product versatility. For example, in a large construction project, various sizes of self-drilling screws may be used to fix different components. Using this versatile waterproof and rust-proof cap eliminates the need for a separate protective cap for each screw, facilitating material management and installation operations, and reducing inventory types and costs. Attached Figure Description

[0026] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0027] Figure 1 This is a schematic diagram of the structure of the cap body in this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of this utility model;

[0029] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 4 This is a schematic diagram of the drill tail wire structure in this utility model;

[0031] In the figure: cap body-1, cavity-101, inlet-102, first boss-103, tapered part-104, drill tail screw-2, nail part-201, nut part-202, diameter changing part-203, groove-204, transition part-205, abutting end-206. Detailed Implementation

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0033] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0034] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Reference Figures 1-4 The first embodiment of this utility model proposes a waterproof and rust-proof cap for a drill tail wire, including a cap body 1, the cap body 1 having a cavity 101, the cavity 101 being hexagonal, and the outer side of the cap body 1 being a regular hexagon.

[0037] In this embodiment, the cavity 101 of the cap body 1 is designed as a hexagon, a shape that allows for a tight and precise match with the common hexagonal screw head. In practical use, when the waterproof and rust-proof cap is installed on the self-drilling screw, the hexagonal cavity 101 fits the screw head well, ensuring the cap is securely fitted and preventing loosening, rotation, or detachment. The hexagonal cavity 101 design facilitates installation. Operators can use tools to install the waterproof and rust-proof cap onto the self-drilling screw by tapping. The hexagonal outer surface of the cap body 1 ensures that installation does not affect the operation of the self-drilling screw, and the hexagonal shape allows for easy clamping of the cap body 1 with tools such as wrenches.

[0038] Because the cavity 101 of the cap body 1 fits tightly to the screw head and the outer hexagonal shape facilitates installation and fixation, the waterproof and rustproof cap can form a relatively closed and stable protective structure after installation. This plays a better role in preventing external moisture, air, and other corrosive media from contacting the screw.

[0039] The overall hexagonal structure of the cap body 1 and the design of the internal hexagonal cavity 101 give it good stability when subjected to external forces. Whether subjected to external impacts, vibrations, or long-term pressure, this waterproof and rustproof cap is not prone to deformation or cracking.

[0040] The hexagonal design of the cavity 101 allows this waterproof and rust-proof cap to accommodate a wide variety of self-drilling screws of different sizes but with hexagonal heads. In actual industrial production and construction installation, various sizes of self-drilling screws exist. This hexagonal cavity 101 waterproof and rust-proof cap, as long as its size is within a reasonable range, can be widely used for hexagonal self-drilling screws of different sizes, improving the product's versatility. For example, in a large construction project, various sizes of self-drilling screws may be used to fix different components. Using this versatile waterproof and rust-proof cap eliminates the need for a separate protective cap for each screw, facilitating material management and installation operations, and reducing inventory types and costs.

[0041] At the same time, this versatility facilitates the promotion and use of the product. Whether in traditional construction and manufacturing industries, or emerging fields such as outdoor facility installation and new energy equipment assembly, wherever there is a need for protection of hexagonal self-drilling screws, this waterproof and rust-proof cap can be considered, thus broadening its market application scope.

[0042] In the existing technology, nuts are formed by injection molding, which means that they are often mass-produced for specific molds and specifications. The shape and size of the nut after molding are basically fixed and are directly connected to the self-drilling screw. Such self-drilling screws are not hexagonal connectors, so it is not possible to make subsequent adjustments or adapt to different specifications of self-drilling bolts.

[0043] The core advantage of the cap body 1 lies in its flexibility. It is not limited by specific injection molds and molding processes; as long as the hexagonal cavity 101 of the cap body 1 is designed within a reasonable fit range, it can be installed on various sizes of self-drilling bolts. This greatly improves its ability to meet diverse needs and allows it to more easily perform its waterproof and rust-proof functions in different application scenarios.

[0044] Furthermore, the cavity 101 has an inlet 102 and a first boss portion 103, the first boss portion 103 being located circumferentially to the inlet 102.

[0045] In this embodiment, the cap 1 is provided with an inlet 102, which serves as a channel for the self-drilling screw to enter the cavity 101 of the cap 1, enabling a tight fit with the self-drilling screw. The size of the inlet 102 can be precisely adapted to the model of the self-drilling screw, so that when the self-drilling screw is inserted, a certain sealing effect can be formed at the inlet 102, effectively preventing external moisture, dust, impurities, and other substances from entering the interior of the cap 1 through the gap between the self-drilling screw and the inlet 102. This further enhances the overall waterproof and rustproof cap's protective capability for the self-drilling screw, ensuring that the self-drilling screw can be kept in a relatively clean, dry, and corrosion-free environment for a long time during use.

[0046] Meanwhile, the presence of inlet 102 also facilitates the installation process. Operators can intuitively align the self-drilling screw with inlet 102 for insertion. Compared to some sealed or concealed inlet designs, this directly visible inlet 102 makes the installation process more convenient, reduces the possibility of damage to the cap 1 or self-drilling screw due to inaccurate installation position, and improves the success rate and efficiency of installation.

[0047] The first protrusion 103, after installation, fits snugly against the mounting surface, enhancing the sealing effect and indirectly improving the stability of the waterproof and rust-proof cap after installation. It increases the contact area between the cap body 1 and the mounting surface, better distributing force when subjected to external forces such as wind or vibration, preventing the cap body 1 from loosening due to uneven stress. Simultaneously, the presence of the first protrusion 103 also facilitates initial positioning and alignment during installation. Operators can quickly determine whether the waterproof and rust-proof cap is installed correctly, whether it is in the correct horizontal or vertical position, etc., by observing the fit between the first protrusion 103 and the periphery of the mounting surface, allowing for timely adjustments and further improving installation quality and the overall structural regularity.

[0048] Furthermore, the cavity 101 has a tapered portion 104, and the tapered portion 104 and the first boss portion 103 are located on the inner and outer sides of the inlet 102, respectively.

[0049] In this embodiment, the tapered portion 104 and the first protrusion portion 103 are located on the inner and outer sides of the inlet 102, respectively. When installing the self-drilling screw, it can provide additional accommodating space for some protrusions, irregular parts, etc. that may exist on the self-drilling screw. For example, some self-drilling screws have small protrusions, small edges, etc., in addition to the basic hexagonal shape, for anti-loosening or easy installation. When it is inserted into the cavity 101 of the cap body 1, the tapered portion 104 can cleverly avoid these structures, avoiding interference with the inner wall of the cavity 101, so that the self-drilling screw can enter the cavity 101 more smoothly and be installed in place, improving the convenience and success rate of installation.

[0050] Furthermore, the presence of the tapered portion 104 allows the waterproof and rust-proof cap to be adapted to a wider range of self-drilling screws with different design details. Even if the self-drilling screws differ in head shape or structure, as long as the hexagonal part of its main body can be basically adapted to the cavity 101, the waterproof and rust-proof cap can be used to protect the end of the self-drilling screw by accommodating it through the tapered portion 104. This further expands the product's versatility and meets the diverse protection needs of self-drilling screws in the market.

[0051] The tapered portion 104, in conjunction with the inlet 102 and the first boss portion 103, optimizes the fit between the cap 1 and the self-drilling screw. When the self-drilling screw is inserted into the cavity 101, the tapered portion 104 allows the cap 1 to better enclose the head of the self-drilling screw, filling the gaps created by the screw's unique structure and enhancing the sealing performance from within. The presence of the tapered portion 104 within the cavity 101 further improves the sealing structure. In practical use, it can work in conjunction with the seal formed at the inlet 102 and the first boss portion 103 to provide multiple barriers against external substances that may intrude from various directions. If moisture attempts to seep into the cap 1 along the self-drilling screw, it will be blocked at the inlet 102. Even if a small amount of moisture breaks through the inlet 102, the tapered part 104, due to its tight fit with the self-drilling screw and its own structural characteristics, can prevent the moisture from penetrating further. This, together with the external sealing effect of the first boss part 103, creates a more robust waterproof system, minimizing the risk of the self-drilling screw rusting and corroding.

[0052] The self-drilling screw includes a waterproof and rust-proof cap for the self-drilling screw, and also includes a self-drilling screw 2. The self-drilling screw 2 has a nail portion 201 and a nut portion 202. The nut portion 202 is hexagonal, and the cavity 101 is used to accommodate the nut portion 202. The cross-sectional area of ​​the nut portion 202 is larger than that of the nut portion 202 of the cap body 1.

[0053] In this embodiment, the nut portion 202 of the self-drilling screw 2 is designed to be hexagonal, which perfectly matches the hexagonal shape of the cavity 101 of the waterproof and rust-proof cap of the self-drilling screw. This consistency in shape allows for a tight and precise fit between the two. During actual installation, the operator can easily insert the nut portion 202 into the cavity 101, just as smoothly as screwing a standard hexagonal nut onto a corresponding hexagonal bolt. This shape-matching design greatly improves installation efficiency and reduces installation difficulties and repeated adjustments that may occur due to shape mismatch, enabling the installation work to be completed quickly and accurately.

[0054] Moreover, the hexagonal matching method has strong stability. Once the nut 202 is installed into the cavity 101, its six sides fit against the inner wall of the cavity 101, which can effectively prevent the self-drilling screw 2 from rotating or loosening relative to the waterproof and rust-proof cap. This ensures that the waterproof and rust-proof cap is always securely fitted onto the nut 202 of the self-drilling screw 2 during use, continuously performing its waterproof and rust-proof function and providing reliable protection for the self-drilling screw 2.

[0055] At the same time, this dimensional relationship also facilitates the operation of the waterproof and rust-proof cap in scenarios that require subsequent inspection or maintenance. For example, when it is necessary to check whether the waterproof and rust-proof cap is damaged or needs to be replaced, the larger nut portion 202 provides sufficient operating space for disassembly tools. Maintenance personnel can more easily hold the nut portion 202 to remove the waterproof and rust-proof cap without worrying about accidentally damaging the self-drilling screw 2 itself or affecting its surrounding connection structure, making the entire maintenance process more convenient and efficient.

[0056] The self-drilling screw 2 is protected by a waterproof and rust-proof cap. The cap body 1's cavity 101, inlet 102, first boss 103, and tapered portion 104 work together to create a relatively enclosed and reliable protective space for the self-drilling screw 2. The cavity 101 encloses the nut portion 202 of the self-drilling screw 2, effectively isolating it from external moisture, air, dust, and other corrosive substances, preventing these factors from causing rust and corrosion, thereby extending the service life of the self-drilling screw 2.

[0057] Furthermore, the nut portion 202 has a variable diameter portion 203, and the tapered portion 104 is used to accommodate the variable diameter portion 203.

[0058] In this embodiment, the variable diameter portion 203 of the nut portion 202 cooperates with the tapered portion 104, enabling a more stable connection of the self-drilling screw 2 during installation and use. When the self-drilling screw 2 is screwed into the corresponding workpiece, the variable diameter portion 203 is embedded in the tapered portion 104, which acts as a limit in the axial direction, effectively preventing the self-drilling screw 2 from loosening or coming out. This concave-convex fit structure increases the contact area between the self-drilling screw 2 and the workpiece, making the force transmission more uniform and dispersing the tensile and compressive forces borne by the self-drilling screw 2 during use. This further enhances the reliability of the connection, avoids damage to the workpiece or the self-drilling screw 2 itself due to excessive local stress, and extends the service life of the self-drilling screw 2 and related connecting components.

[0059] When installing the self-drilling screw 2, the correspondence between the reducing portion 203 and the tapered portion 104 provides a clear installation positioning reference for the construction personnel. The construction personnel only need to align the reducing portion 203 of the self-drilling screw 2 with the tapered portion 104 on the workpiece, and then install it according to the normal screw-in operation. The operation steps are clear and straightforward. Compared with self-drilling screw 2 without this feature, it reduces the adjustment and alignment time during the installation process, improves the accuracy and efficiency of installation, and can significantly shorten the overall installation period and reduce labor costs, especially when installing self-drilling screw 2 in batches.

[0060] When it is necessary to disassemble the self-drilling thread 2, such as for equipment maintenance, component replacement, or quality inspection of the self-drilling thread 2 itself, the mating structure of the reducing section 203 and the tapered section 104 makes the operation relatively convenient. Maintenance personnel can use appropriate tools to unscrew the self-drilling thread 2 in the reverse order of installation. During unscrewing, the reducing section 203 can smoothly disengage along the tapered section 104, eliminating the need for complex additional operations or special tools to disengage the two parts. This greatly reduces the difficulty and workload of disassembly, shortens maintenance time, minimizes the impact on normal equipment use, and improves the maintainability and availability of the equipment.

[0061] Furthermore, the end of the nut portion 202 has a groove 204.

[0062] In this embodiment, the shape, size, and other features of the groove 204 can serve as an identification method for the product specifications of the self-drilling screw 2. Different specifications of self-drilling screws 2, such as different thread lengths, diameters, or materials, can be distinguished by providing differentiated grooves 204 at the end of the nut portion 202. For personnel involved in production, warehousing, and use, observing the appearance of the groove 204 allows for quick and accurate determination of the specific specifications of the self-drilling screw 2, facilitating classification, storage, retrieval, and ensuring the selection of the correct specification of self-drilling screw 2 during installation. This avoids installation errors and mismatches caused by specification confusion, improving the management efficiency and accuracy of the entire supply chain and usage process.

[0063] Furthermore, the cap body 1 is a heat-fused cap body.

[0064] In this embodiment, when the cap 1 is a thermoplastic cap, during the installation of the self-drilling wire 2, it is heated and melted. The thermoplastic material fills the tiny gap between the self-drilling wire 2 and the workpiece. After cooling and solidification, it acts like an additional "adhesive" between the two, greatly enhancing the connection between the self-drilling wire 2 and the workpiece. For example, in situations where connection stability is extremely important, such as fixing load-bearing structural components in the construction industry or connecting key transmission components in the machinery manufacturing field, the characteristics of this thermoplastic cap ensure that the self-drilling wire 2 remains firmly fixed to the workpiece even under long-term tensile, compressive, and vibration forces, effectively preventing loosening or detachment, and ensuring the safety and reliability of the entire structure or equipment.

[0065] Moreover, the solidified heat-fused cap has high strength, which can share some of the external force borne by the drill tail wire 2 during use, further optimizing the force transmission path, making the force on the connection part more uniform, reducing the risk of damage to the drill tail wire 2 or the workpiece due to excessive local force, and extending the service life of the drill tail wire 2 and related components.

[0066] The self-drilling screw 2 with a heat-fused cap exhibits excellent compatibility, making it suitable for workpieces made of various materials, including metal, wood, plastic, and composites. During installation, the heat-fused cap ensures a secure bond with the workpiece surface. This feature significantly expands the application range of the self-drilling screw 2, enabling it to function effectively in diverse assembly scenarios across different industries and fields. For example, in woodworking, the heat-fused cap allows for a tight fit with the wood surface when installing wooden furniture components; while in the electronics industry, it provides effective connection and sealing to plastic casings, meeting diverse production needs and enhancing its versatility and market competitiveness.

[0067] Furthermore, the nut portion 202 has a transition portion 205, the transition portion 205 has an abutting end 206, the abutting end 206 is used to abut against the outside, and the transition portion 205 is used for transitional connection between the nut portion 202 and the abutting end 206.

[0068] In this embodiment, the abutting end 206 of the transition portion 205 is used to abut against the outside. During the installation of the self-drilling screw 2, this abutting action can play a good positioning and support role. When the self-drilling screw 2 is screwed into the workpiece, the abutting end 206 can make close contact with the surface of the workpiece or other related components, so that the self-drilling screw 2 can obtain a clear positioning in the axial direction, ensuring that its installation position is accurate and stable. For example, in some equipment that requires precise assembly, such as the assembly of precision instruments or the fixing of mechanical transmission components, the abutting end 206 can help the self-drilling screw 2 to be accurately positioned, avoiding installation position deviations, thereby ensuring the accuracy and stability of the entire assembly structure and reducing the risk of equipment failure due to installation errors.

[0069] Meanwhile, during subsequent use of the self-drilling screw 2, the abutting end 206 continuously abuts against the outside, providing additional support for the self-drilling screw 2. Especially when subjected to external forces such as tension, pressure, and lateral force, it can effectively share these external forces, preventing the self-drilling screw 2 from loosening, deforming, or even coming off due to uneven force distribution. This enhances the stability of the connection between the self-drilling screw 2 and the workpiece, ensuring that the self-drilling screw 2 can reliably play its fixed connection role under long-term complex working conditions, and extending the service life of the self-drilling screw 2 and related components.

[0070] The transition section 205 serves as the transition connection between the nut section 202 and the abutment end 206, and its design helps optimize the force transmission path. When the self-drilling thread 2 is subjected to external force, the force is transmitted from the nut section 202 to the abutment end 206 through the transition section 205. The transition section 205 can disperse and buffer the force concentrated in the nut section 202, so that the force is transmitted more evenly to the abutment end 206 and the external surface in contact with it, avoiding damage to the nut section 202 or the abutment end 206 due to excessive local force. For example, when the self-drilling thread 2 is subjected to a large tightening torque or vibration and impact during operation, the existence of the transition section 205 is like a "buffer zone," ensuring the rationality of the stress distribution of the entire structure, improving the resistance of the self-drilling thread 2 to external forces, further enhancing its stability under different working conditions, and ensuring the safety and reliability of the connected components.

[0071] The transition portion 205 provides a degree of protection for the nut portion 202 and the abutment end 206. In actual use, the nut portion 202 is susceptible to wear and deformation due to external factors such as collisions and friction. The abutment end 206 faces the same risk, especially during frequent contact with external forces. The transition portion 205 acts as a buffer zone, reducing the impact and friction forces directly applied to the nut portion 202 and the abutment end 206, slowing their wear rate, maintaining their structural integrity and normal function, extending the overall service life of the self-drilling screw 2, reducing the frequency of replacement due to component damage, lowering operating costs, and improving economic efficiency.

[0072] Furthermore, the transition section 205 is tapered.

[0073] In this embodiment, the transition portion 205 adopts a tapered design, which can more effectively optimize the force transmission path when the self-drilling wire 2 is subjected to external force. Compared with other transition structures, the tapered transition portion 205 can achieve a more natural and smooth transition in the process of force transmission from the nut portion 202 to the abutment end 206. When the self-drilling wire 2 is subjected to external forces such as tension, pressure or torsion, the tapered structure can evenly distribute these forces along its curve, avoiding local force concentration, reducing the risk of damage such as cracks or deformation to the nut portion 202, the transition portion 205 itself or the abutment end 206 due to stress concentration, thereby enhancing the overall structural stability of the self-drilling wire 2, ensuring its reliable connection function under long-term complex working conditions, and extending the service life of the self-drilling wire 2.

[0074] The tapered transition section 205 has better resistance to deformation. Its smooth curved shape allows it to buffer and absorb some energy through its elastic deformation when subjected to external impact or uneven stress, and then return to its original shape, maintaining the integrity of the entire self-drilling wire 2 structure. This elastic deformation characteristic helps prevent excessive bending, twisting, or other deformation of the self-drilling wire 2 during use after installation, ensuring that the connection angle and position between the self-drilling wire 2 and the workpiece remain relatively stable, further enhancing the strength of the connection. This ensures that even in harsh working environments such as those with vibration or impact, the self-drilling wire 2 can be firmly fixed to the workpiece, preventing loosening or detachment, and guaranteeing the normal operation of the connected components.

[0075] When the tapered transition section 205 comes into contact with the outside environment or moves relative to other components during installation and use, it effectively reduces wear and friction compared to angular structures. In practical applications, the self-drilling thread 2 may rub against the workpiece surface, installation tools, or other surrounding components. The tapered surface is smoother, and the friction on the contact surface is smaller during relative movement. This not only reduces the wear rate of the transition section 205 itself but also reduces damage to the surfaces of other components it contacts, extending the service life of the entire self-drilling thread 2 and related components. It also reduces the frequency of replacement due to component wear, saves operating costs, and improves economic efficiency.

[0076] Furthermore, the cross-sectional area of ​​the transition portion 205 is larger than the cross-sectional area of ​​the nut portion 202.

[0077] In this embodiment, the cross-sectional area of ​​the transition portion 205 is larger than that of the nut portion 202. This allows the transition portion 205 to occupy a wider space within the drill thread 2 structure, providing stronger support and positioning during connection. When the drill thread 2 is installed onto the workpiece, the larger diameter transition portion 205 has a relatively larger contact area with the outside, thus better dispersing external forces, such as tension, pressure, and potential lateral forces, in multiple directions, including axial and radial. It acts like a stable "base," ensuring the drill thread 2 maintains a stable position even under complex stress environments. This reduces the probability of the drill thread 2 loosening, dislodging, or deflecting due to uneven stress, greatly enhancing the connection between the drill thread 2 and the workpiece. This ensures the stability and reliability of the entire assembly structure, making it particularly suitable for applications requiring long-term resistance to large external forces, such as building structure fixing and heavy machinery component connections.

[0078] Moreover, the larger diameter transition portion 205 can compensate for the relative limitations of the nut portion 202 in terms of force bearing to a certain extent, thereby optimizing the overall force bearing performance of the self-drilling screw 2. Even under extreme working conditions, it can reliably perform its fixed connection function, extend the service life of the self-drilling screw 2 and related components, and reduce safety hazards and maintenance costs caused by connection failure.

[0079] From the perspective of force transmission, this dimensional design is beneficial for optimizing the force transmission path between the various parts of the self-drilling wire 2. When an external force is applied to the self-drilling wire 2, the force is transmitted from the nut 202 to the transition 205. Because the transition 205 has a larger diameter, it can more effectively disperse and buffer the force concentrated in the nut 202, and then evenly transmit it to the contact end 206 and the external surface it contacts. This avoids excessive local stress caused by sudden force concentration or poor transmission, reduces the risk of damage such as cracks or deformation to the nut 202, transition 205, and contact end 206, ensures the integrity of the entire self-drilling wire 2 structure, improves its resistance to external forces, and enables the self-drilling wire 2 to stably connect the various components under different working conditions, ensuring the normal operation of the connected equipment or structure and improving the safety and reliability of use.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A waterproof and rust-proof cap for a self-drilling screw, characterized in that, include: The cap body (1) has a cavity (101) which is hexagonal and the outer side of the cap body (1) is a regular hexagon. The cavity (101) has an entrance (102) and a first protrusion (103). The first protrusion (103) is located around the entrance (102). The cavity (101) has a conical part (104). The conical part (104) and the first protrusion (103) are located on the inner and outer sides of the entrance (102), respectively.

2. A type of self-drilling wire, characterized in that, Including the waterproof and rust-proof cap for the self-drilling screw as described in claim 1, it further includes: The self-drilling thread (2) has a nail part (201) and a nut part (202). The nut part (202) is hexagonal. The cavity (101) is used to accommodate the nut part (202). The cross-sectional area of ​​the cavity (101) is greater than or equal to that of the nut part (202) of the cap body (1).

3. A self-drilling wire according to claim 2, characterized in that, The nut portion (202) has a variable diameter portion (203), and the tapered portion (104) is used to accommodate the variable diameter portion (203).

4. A self-drilling wire according to claim 2, characterized in that, The end of the nut portion (202) has a groove (204).

5. A self-drilling wire according to claim 2, characterized in that, The cap body (1) is a heat-fused cap body.

6. A self-drilling wire according to claim 3, characterized in that, The variable diameter part (203) has a transition part (205), the transition part (205) has an abutment end (206), the abutment end (206) is used to abut against the outside, and the transition part (205) is used for the transition connection between the nut part (202) and the abutment end (206).

7. A self-drilling wire according to claim 6, characterized in that, The transition section (205) is tapered.

8. A self-drilling wire according to claim 6, characterized in that, The cross-sectional area of ​​the transition portion (205) is greater than the cross-sectional area of ​​the nut portion (202).

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