A stainless steel composite bolt

Abstract

This utility model discloses a stainless steel composite bolt, including a bolt body, a waterproof nut, and a washer. A groove is provided on one side of the inner surface of the bolt body, and a locking hole is provided within the groove. The waterproof nut is made of rubber. This stainless steel composite bolt, through the arrangement of the bolt body, waterproof nut, support column, spring, and buckle, achieves axial self-locking and anti-loosening of the waterproof nut on the bolt body by relying on the spring to drive the buckle past the locking hole and spring back into place during use. The elastic outer edge of the waterproof nut fits against the end face or outer circumference, and together with the waterproof groove, it acts as a capillary water-cutting point and a stepped barrier with the washer, blocking the penetration of water film and liquid bridges. The waterproof nut also serves as a dielectric and hydrophobic barrier, weakening electrochemical coupling and stray current pathways, reducing corrosion current and the risk of electrolytic corrosion. It maintains locking and sealing under vibration and thermal cycling, allowing for disassembly and replacement by pressing the buckle during maintenance.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, and in particular to a stainless steel composite bolt. Background Technology

[0002] Early bolts were mostly forged by hand, which was inefficient and lacked precision. With the advancement of machining technology, the standardization and mass production of bolts became possible.

[0003] Existing bolts do not have the function of preventing corrosion and preventing electric current. Since stainless steel can also undergo localized corrosion under certain conditions, the electric current can easily cause galvanic corrosion when different metals are in contact or when electrolytes are present due to the inherent conductivity of metal bolts. This is particularly prominent under complex conditions such as humidity, salt spray, and electrical environments, which seriously affects their reliability and lifespan. Furthermore, bolts are highly uncontrollable during assembly, have poor corrosion resistance and wear resistance during service, and the preload is difficult to stabilize over a long period of time, significantly increasing maintenance requirements and failure risks. Utility Model Content

[0004] The main objective of this invention is to provide a stainless steel composite bolt that can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A stainless steel composite bolt includes a bolt body, a waterproof nut, and a washer. A groove is provided on one side of the inner surface of the bolt body, and a retaining hole is provided in the groove of the bolt body. The waterproof nut is made of rubber material, and a support column is fixedly connected to one side of the lower surface of the waterproof nut. A spring is fixedly connected to one side of the inner wall of the support column, and a buckle is fixedly connected to one end of the spring.

[0006] To achieve a snap-fit ​​connection, in this stainless steel composite bolt, a groove is provided on one side of the outer surface of the waterproof nut, and a groove is provided on one side of the outer surface of the bolt body, so that the waterproof nut and the bolt body can be snapped together.

[0007] To achieve a protective effect, the stainless steel composite bolt of this utility model has a waterproof groove on one side of the inner surface of the bolt body, and the washer is movably connected to the bolt body.

[0008] To achieve highly efficient protection, the outer surface of the stainless steel composite bolt of this invention is coated with a multi-layer gradient coating, which includes CRN, MOS2 and DCL, and the multi-layer gradient coating is applied in sequence as the bottom layer, the middle layer and the outer layer.

[0009] Compared with the prior art, the present invention has the following beneficial effects: 1. In this utility model, through the arrangement of bolt body, waterproof nut, support column, spring and buckle, the structure relies on the spring to drive the buckle to pass through the buckle hole and spring back into place during use, so as to realize the axial self-locking and anti-loosening of the waterproof nut on the bolt body. The elastic outer edge of the waterproof nut fits in close contact with the end face or outer circumference, and together with the waterproof groove, it acts as a step-like barrier between the capillary water cut-off point and the gasket, blocking the infiltration of water film and liquid bridge. The waterproof nut also acts as a dielectric and hydrophobic barrier, weakening electrochemical coupling and stray current path, reducing corrosion current and electrolytic corrosion risk, and maintaining locking and sealing under vibration and thermal cycling. When maintenance is needed, the buckle can be pressed down to disassemble and replace the nut.

[0010] 2. In this utility model, through the setting of a multi-layer gradient coating, during use, the CRN bottom layer provides high hardness and dense barrier corrosion resistance and load bearing, the MOS2 middle layer provides solid lubrication, stabilizes torque-axial force, reduces seizing and fretting wear, and the DLC outer layer is inert, hydrophobic and antifouling, inhibits water film and electrochemical active sites and weakens stray current paths, achieving a synergistic effect of three layers of hardness, lubrication and inertness, making assembly more controllable, service more corrosion resistant and wear-free, long-term stable preload, and reduced maintenance requirements. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the gasket structure according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the multilayer gradient coating structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the spring structure according to an embodiment of the present invention.

[0012] In the diagram: 1. Bolt body; 2. Waterproof nut; 3. Support column; 4. Spring; 5. Clip; 6. Multi-layer gradient coating; 7. Gasket. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Example 1 like Figure 1-4 As shown, a stainless steel composite bolt includes a bolt body 1, a waterproof nut 2, and a washer 7. A groove is provided on one side of the inner surface of the bolt body 1, and a retaining hole is provided in the groove of the bolt body 1. The waterproof nut 2 is made of rubber material, and a support column 3 is fixedly connected to one side of the lower surface of the waterproof nut 2. In this embodiment, a spring 4 is fixedly connected to one side of the inner wall of the support column 3, and a buckle 5 is fixedly connected to one end of the spring 4.

[0015] In practical use, the structure relies on the spring 4 to drive the buckle 5 to pass through the buckle hole and spring back into place, so as to realize the axial self-locking and anti-loosening of the waterproof nut 2 on the bolt body 1. The elastic outer edge of the waterproof nut 2 fits against the end face or outer circumference, and together with the waterproof groove, it acts as a capillary water cut-off point and a stepped barrier of the gasket 7 to block the infiltration of water film and liquid bridge. The waterproof nut 2 also acts as a dielectric and hydrophobic barrier, weakening electrochemical coupling and stray current path, reducing corrosion current and the risk of electrolytic corrosion. It maintains locking and sealing under vibration and thermal cycling, so that it can be disassembled and replaced by pressing the buckle during maintenance.

[0016] In this embodiment, a groove is provided on one side of the outer surface of the waterproof nut 2, and a groove is provided on one side of the outer surface of the bolt body 1, so that the waterproof nut 2 and the bolt body 1 are engaged.

[0017] In practical use, when the waterproof nut 2 is pressed or screwed into the bolt body to the designed position, the convex groove enters the groove under the action of the guide inclined surface, realizing geometric self-locking circumferential limit and additional axial anti-reverse.

[0018] In this embodiment, a waterproof groove is provided on one side of the inner surface of the bolt body 1, and the gasket 7 is movably connected to the bolt body 1.

[0019] In practical use, the waterproof groove serves as a capillary interruption point. By changing the geometry and surface energy of the microchannels, the formation and spread of the continuous water film are disrupted, preventing water from penetrating into the interior along the threads or other interfaces. At the same time, the movable connection characteristics of the gasket 7 and the bolt body 1 allow it to freely adjust its posture when under pressure during assembly, better fit the connected parts, and form a multi-level or misaligned barrier with the outer edge of the waterproof nut 2, shortening the movement path of water molecules.

[0020] In this embodiment, the outer surface of the bolt body 1 is coated with a multi-layer gradient coating 6, which includes CRN, MOS2 and DCL. The multi-layer gradient coating 6 is applied in sequence as the bottom layer, the middle layer and the outer layer.

[0021] In practical applications, the CRN bottom layer provides high hardness and a dense barrier to resist corrosion and bear load, the MOS2 middle layer provides solid lubrication to stabilize torque and axial force, reduce seizing and fretting wear, and the DLC outer layer is inert, hydrophobic and antifouling to inhibit water film and electrochemical active sites and weaken stray current paths. This achieves a synergistic effect of three layers of hardness, lubrication and inertness, making assembly more controllable, service more corrosion resistant and wear-resistant, long-term stable preload, and reduced maintenance requirements.

[0022] Working principle: In use, this structure relies on spring 4 to drive buckle 5 to pass through the buckle hole and spring back into place, realizing the axial self-locking and anti-loosening of waterproof nut 2 on bolt body 1. The elastic outer edge of waterproof nut 2 fits against the end face or outer circumference, and together with the waterproof groove as a capillary water cut-off point and the stepped barrier of gasket 7, it blocks the infiltration of water film and liquid bridge. Waterproof nut 2 also acts as a dielectric and hydrophobic barrier, weakening electrochemical coupling and stray current path, reducing corrosion current and electrolytic corrosion risk. It maintains locking and sealing under vibration and thermal cycling. When maintenance is needed, the buckle can be pressed down to disassemble and replace. By using the waterproof groove as a capillary interruption point, the geometry and surface energy of the micro-channel are changed to disrupt the formation and spread of continuous water film, preventing water from penetrating into the interior along the thread or other interfaces. At the same time, the movable connection characteristics of gasket 7 and bolt body 1 allow it to freely adjust its posture when under pressure during assembly, better fit the connected parts, and form a multi-level or staggered barrier with the outer edge of waterproof nut 2, shortening the movement path of water molecules.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A stainless steel composite bolt, comprising a bolt body (1), a waterproof nut (2), and a washer (7), characterized in that: A groove is provided on one side of the inner surface of the bolt body (1), and a locking hole is provided in the groove of the bolt body (1). The waterproof nut (2) is made of rubber material. A support column (3) is fixedly connected to one side of the lower surface of the waterproof nut (2). A spring (4) is fixedly connected to one side of the inner wall of the support column (3), and a buckle (5) is fixedly connected to one end of the spring (4).

2. The stainless steel composite bolt according to claim 1, characterized in that: The waterproof nut (2) has a groove on one side of its outer surface, and the bolt body (1) has a groove on one side of its outer surface. The waterproof nut (2) and the bolt body (1) are engaged.

3. A stainless steel composite bolt according to claim 1, characterized in that: A waterproof groove is provided on one side of the inner surface of the bolt body (1), and the gasket (7) is movably connected to the bolt body (1).

4. A stainless steel composite bolt according to claim 1, characterized in that: The outer surface of the bolt body (1) is coated with a multi-layer gradient coating (6), which includes crn, os2 and dcl, and the multi-layer gradient coating (6) is applied in sequence as the bottom layer, the middle layer and the outer layer.

Images