Rust-proof bolt
By installing protective sleeves, sealing rings, and connecting sleeves on bolts, the problem of bolts rusting in humid or corrosive environments is solved, achieving rust prevention and reusability, and improving the mechanical properties and structural safety of bolts.
Patent Information
- Application Number
- CN202520428189.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-03-12
AI Technical Summary
Bolts are prone to rust in humid or corrosive environments, which leads to a decline in mechanical properties and affects service life and structural safety.
A rust-proof bolt was designed, comprising a protective sleeve, a sealing ring, and a connecting sleeve. The protective sleeve protects the bolt from direct contact with a humid or corrosive environment, the sealing ring seals the inside of the protective sleeve to prevent corrosive substances from entering, and a limiting ring and an anti-slip sleeve are combined to enable the bolt to be reused.
It effectively prevents bolts from rusting, extends their service life, improves mechanical performance, ensures the safety and reliability of the structure, and supports the reuse of bolts.
Smart Images
Figure CN223781867U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bolt technology, and more specifically, to a rust-proof bolt. Background Technology
[0002] The importance of bolts extends beyond their basic fastening function; they also have a profound impact on engineering design and construction processes. During the planning phase, engineers must accurately calculate the required number, size, and material of bolts to ensure the structure can withstand the anticipated loads, taking into account environmental factors such as temperature variations, humidity levels, and potential chemical corrosion. Selecting the right bolts is crucial for preventing potential problems during long-term use.
[0003] For example, equipment used in cold regions or polar environments may use bolts made of materials with good low-temperature toughness to prevent brittleness under extreme temperatures. In coastal or marine engineering, stainless steel or specially treated bolts are preferred to resist salt spray corrosion. Furthermore, high-strength, lightweight alloy bolts in the aerospace industry can effectively reduce aircraft weight without sacrificing safety; while automobile manufacturing prioritizes heat resistance and vibration resistance to ensure driving safety.
[0004] With advancements in technology, new materials and technologies are constantly emerging, bringing more possibilities to the design and application of bolts. The application of self-locking nuts and prestressed bolt connections has improved the reliability of fastening systems. Meanwhile, the concept of smart fasteners is gradually gaining popularity. These bolts, equipped with sensors, can monitor their stress levels in real time during operation, providing early warnings of potential risks and further enhancing structural safety and maintenance efficiency. Through continuous innovation and development, bolts will continue to play an indispensable role in future engineering construction and technological progress.
[0005] However, despite their crucial role, bolts face significant challenges. Particularly when exposed to humid or corrosive environments, rust becomes a major threat to their lifespan and functionality. Over time, oxidation gradually corrodes the metal surface, not only ruining the bolt's original appearance but, more importantly, altering the bolt's material properties, reducing its tensile strength and toughness, thus weakening its fastening effect. Once the bolt's mechanical properties deteriorate, it can lead to loosening or even breakage of the connection, posing potential safety risks to the structure. Utility Model Content
[0006] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a rust-proof bolt.
[0007] A rust-proof bolt includes a nut, a screw, and a protective sleeve. The screw is connected to the bottom of the nut, and the protective sleeve is threaded onto the screw. The screw is located inside the protective sleeve. A threaded groove is opened at the top of the protective sleeve. The middle and lower sides of the inner side of the protective sleeve are both cylindrical hollow.
[0008] Furthermore, it also includes a connecting sleeve, with the outer wall of the protective sleeve being slidably connected to the connecting sleeve.
[0009] Furthermore, the cross-section of the connecting sleeve is a regular hexagon.
[0010] Furthermore, it also includes a sealing ring, with a sealing ring connected to the bottom of the nut.
[0011] Furthermore, it also includes a limiting ring, and the bottom of the protective sleeve is provided with a threaded protrusion, through which the limiting ring is threadedly connected.
[0012] Furthermore, it also includes an anti-slip sleeve, with the outer wall of the limiting ring connected to the anti-slip sleeve.
[0013] The beneficial effects are: This utility model is equipped with a protective sleeve, a sealing ring and a connecting sleeve. The protective sleeve can prevent the screw from directly contacting a humid or corrosive environment, protect the thread groove on the screw, and prevent the screw from rusting or being corroded. The sealing ring can seal the inside of the protective sleeve, prevent substances in the humid or corrosive environment from entering the inside of the protective sleeve, and further prevent the screw from rusting or being corroded. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0015] Figure 2 This is a cross-sectional schematic diagram of the protective sleeve of this utility model.
[0016] Figure 3 This is a cross-sectional view of the connecting sleeve of this utility model.
[0017] Figure 4 This is a cross-sectional schematic diagram of the limiting ring of this utility model.
[0018] In the attached diagram, the following are the reference numerals: 1-nut, 2-screw, 3-protective sleeve, 4-sealing ring, 5-connecting sleeve, 6-threaded protrusion, 7-limiting ring, and 8-anti-slip sleeve. Detailed Implementation
[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0020] A type of rust-proof bolt, such as Figures 1-4As shown, it includes a nut 1, a screw 2, a protective sleeve 3, a sealing ring 4, and a connecting sleeve 5. The bottom of the nut 1 is fixedly connected to the screw 2, and the protective sleeve 3 is threaded onto the screw 2. The screw 2 is located inside the protective sleeve 3. The top of the protective sleeve 3 has a threaded groove. The middle and lower sides of the inner side of the protective sleeve 3 are both cylindrical and hollow. The bottom of the nut 1 is fixedly connected to the sealing ring 4, and the connecting sleeve 5 is slidably connected to the outer wall of the protective sleeve 3. The connecting sleeve 5 has a regular hexagonal cross-section, which facilitates the removal of the connecting sleeve 5. Furthermore, since the entire connecting sleeve 5 is a regular hexagon, it can still be removed even if part of the connecting sleeve 5 is rusted or corroded.
[0021] When using this bolt, first, make a hole in the installation position, then fix the connecting sleeve 5 in the hole in the installation position, then align the protective sleeve 3 with the top opening of the connecting sleeve 5, and then slide the protective sleeve 3 down from the top of the connecting sleeve 5 so that the protective sleeve 3 is inside the connecting sleeve 5. Then, align the screw 2 with the top opening of the protective sleeve 3, and rotate the nut 1 to make the screw 2 rotate. Under the action of the threaded connection between the protective sleeve 3 and the screw 2, the screw 2 rotates into the interior of the protective sleeve 3. The protective sleeve 3 can prevent the screw 2 from directly contacting the humid or corrosive environment, protect the threaded groove on the screw 2, and prevent the screw 2 from rusting or being corroded. When the nut 1 contacts the top of the protective sleeve 3, continue to rotate the nut 1 so that the sealing ring 4 is squeezed, thereby enabling the sealing ring 4 to seal the interior of the protective sleeve 3, preventing substances in the humid or corrosive environment from entering the interior of the protective sleeve 3, and further preventing the screw 2 from rusting or being corroded.
[0022] like Figure 1 , Figure 2 and Figure 4 As shown, it also includes a limiting ring 7 and an anti-slip sleeve 8. The bottom of the protective sleeve 3 is provided with a threaded protrusion 6. The bottom of the protective sleeve 3 is threadedly connected to the limiting ring 7 through the threaded protrusion 6. The anti-slip sleeve 8 is fixedly connected to the outer wall of the limiting ring 7. The anti-slip sleeve 8 can increase the friction of the outer wall of the limiting ring 7 and prevent the limiting ring 7 from slipping when rotating. The anti-slip sleeve 8 can also protect the limiting ring 7 and improve the rust resistance and corrosion resistance of the limiting ring 7.
[0023] Before using this bolt, first place the limiting ring 7 into the groove, then fix the connecting sleeve 5 into the groove, so that the connecting sleeve 5 is located at the top of the limiting ring 7, and the limiting ring 7 is aligned with the bottom of the protective sleeve 3. Then rotate the limiting ring 7 so that it rotates along the threaded protrusion 6 at the bottom of the protective sleeve 3. When the top of the limiting ring 7 is aligned with the top of the threaded protrusion 6 at the bottom of the protective sleeve 3, the connecting sleeve 5 is located between the protective sleeve 3 and the limiting ring 7. The limiting ring 7 can prevent the connecting sleeve 5 from moving downwards. When the connecting sleeve 5 is rusted or corroded, it needs to be replaced. Use a tool to grasp the outer wall of the connecting sleeve 5, then pull the bolt out completely. Then hold the limiting ring 7 and reverse it to remove the limiting ring 7. Then slide the connecting sleeve 5 downward to remove it. Then slide the new connecting sleeve 5 upward to reset it. Then rotate the limiting ring 7 again to make it threadedly connected with the threaded protrusion 6 at the bottom of the protective sleeve 3. This completes the replacement of the bolt and realizes the reuse of the bolt.
[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A rust-proof bolt, characterized in that, It includes a nut (1), a screw (2) and a protective sleeve (3). The bottom of the nut (1) is connected to the screw (2), and the screw (2) is threadedly connected to the protective sleeve (3). The screw (2) is located inside the protective sleeve (3). The top of the protective sleeve (3) has a threaded groove. The middle and lower sides of the inner side of the protective sleeve (3) are both cylindrical hollow.
2. The rust-proof bolt according to claim 1, characterized in that, It also includes a connecting sleeve (5), and the outer wall of the protective sleeve (3) is slidably connected to the connecting sleeve (5).
3. The rust-proof bolt according to claim 2, characterized in that, The cross-section of the connecting sleeve (5) is a regular hexagon.
4. The rust-proof bolt according to claim 3, characterized in that, It also includes a sealing ring (4), and the bottom of the nut (1) is connected to the sealing ring (4).
5. A rust-proof bolt according to claim 4, characterized in that, It also includes a limiting ring (7), and the bottom of the protective sleeve (3) is provided with a threaded protrusion (6), and the bottom of the protective sleeve (3) is threadedly connected to the limiting ring (7) through the threaded protrusion (6).
6. The rust-proof bolt according to claim 5, characterized in that, It also includes an anti-slip sleeve (8), and the outer wall of the limiting ring (7) is connected to the anti-slip sleeve (8).