Anti-corrosion tap bolt

Abstract

The utility model belongs to the technical field of bolts, and particularly relates to an anti-corrosion tap bolt. The anti-corrosion self-tapping bolt comprises a bolt cap, a threaded section is fixedly welded to the bottom of the bolt cap, a self-tapping groove is formed in the top wall of the bolt cap, a drill bit is fixedly connected to the tail end of the threaded section, and a protection assembly used for protecting the bolt cap is installed on the outer side of the bolt cap. An outer side anti-corrosion assembly used for achieving the anti-corrosion effect on the bolt is installed on the outer wall of the threaded section, the protection assembly comprises a protection cap, the protection cap is matched with the outer surface of the bolt cap, a plurality of external connecting pieces are fixedly connected to the bottom wall of the protection cap at equal intervals, and fixing pieces are fixedly connected to the inner sides of the outer walls of the external connecting pieces; the bolt cap on the surface of the tap bolt can be effectively protected through the protection assembly, meanwhile, the protection assembly is used in cooperation with the outer side anti-corrosion assembly formed by compounding multiple materials, the anti-corrosion capacity of the bolt is further improved, and therefore the defect that a traditional single coating scheme is prone to falling off is effectively overcome.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt technical field, concretely is a kind of anticorrosive self-tapping bolt. BACKGROUND

[0002] Self-tapping bolt is a kind of bolt with drill bit, is completed by special electric tool construction, drilling, tapping, fixed, locking, bolt is a kind of most common fastener, is applied to each field of human production, life.

[0003] Chinese patent authorization announcement No. The utility model discloses a kind of anticorrosive self-tapping bolt, the scheme "including cap, the lower end of the cap is fixedly connected with stud, the surface of the cap is fixedly provided with anticorrosive coating, can prevent bolt cap from being corroded and damaged in long time use process, the inside of the cap is equipped with first installation slot, the inside of the stud is equipped with second installation slot corresponding to first installation slot, the lower end of the stud is fixedly connected with self-tapping drill bit, the lower end of the stud is equipped with self-locking hole. This kind of anticorrosive self-tapping bolt, by the lower end of the cap fixedly connected with waterproof ring, while the lower end of waterproof ring is equipped with multiple dentate grooves, waterproof ring will rotate synchronously when self-tapping bolt rotates, under the action of external force, waterproof ring will be embedded into fastener inside along with self-tapping bolt, when bolt encounters rain or domestic water splashes, waterproof ring will play the role of barrier, rain will not contact stud, to avoid stud long time use is corroded, increase the service life of self-tapping bolt".

[0004] The above-mentioned device only realizes barrier effect by waterproof ring, since bolt corrosion is not only in this single factor of humid environment, also related to acidic or salt fog environment, material itself characteristic and electrochemical corrosion etc. Variety of reasons, while waterproof ring is easily damaged in the process that bolt is connected with fastener, simultaneously the design of single waterproof ring cannot guarantee the anticorrosive effect of bolt. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of anticorrosive self-tapping bolt to solve the problems raised in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of anticorrosive self-tapping bolt, including bolt cap, the bottom of the bolt cap is fixedly welded with threaded section, the top wall of the bolt cap is equipped with self-tapping groove, the end of the threaded section is fixedly connected with drill bit, the outside of the bolt cap is installed with the protective assembly for protecting bolt cap, the outer wall of the threaded section is installed with the outside anticorrosive assembly for the anticorrosive effect of bolt.

[0007] Preferably, the protection assembly comprises a protection cap matched with the outer surface of the bolt cap, a plurality of outer connecting pieces are fixedly connected to the bottom wall of the protection cap at equal intervals, a fixing piece is fixedly connected to the inner wall of the outer connecting piece, a plurality of protruding barbs are continuously fixedly connected to the top wall of the fixing piece, grooves are formed in the outer wall of the bolt cap corresponding to the fixing piece, the protection cap is combined with the bolt cap through the protruding barbs and the grooves, and a memory alloy ring is installed in the protection cap.

[0008] Preferably, the outer anticorrosion assembly comprises, from inside to outside, a base layer, a transition layer, a functional layer and a surface layer.

[0009] Preferably, a plurality of oil storage grooves are formed in the outer wall thread transition position of the threaded section, nano micropores are formed in the inner wall of the oil storage groove, and the oil storage grooves are distributed along the spiral direction of the thread.

[0010] Preferably, the oil storage groove is designed in a trapezoidal structure with a wide upper part and a narrow lower part.

[0011] Preferably, the base layer is made of low-carbon alloy steel material, the transition layer is made of zinc-nickel alloy electroplating layer material, the functional layer is made of epoxy resin powder coating material, and the surface layer is made of fluorocarbon polymer film material.

[0012] Compared with the prior art, the self-tapping bolt has the advantages that the bolt cap on the surface of the self-tapping bolt is effectively protected by the protection assembly, the outer anticorrosion assembly designed in combination with a plurality of materials is used in cooperation, the anticorrosion capability of the bolt itself is further improved, and the drawbacks of the traditional single coating scheme that is prone to falling off are effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the utility model;

[0014] Figure 2 It is an enlarged structural schematic view of A in Figure 1

[0015] Figure 3 It is a split structural schematic view of the self-tapping bolt according to the utility model;

[0016] Figure 4 It is an enlarged structural schematic view of B in Figure 3

[0017] Figure 5 It is a schematic view of the threaded section of the self-tapping bolt according to the utility model.

[0018] ​​In the diagram: 1. Bolt cap; 2. Threaded section; 3. Self-tapping groove; 4. Drill bit; 5. Protective cap; 51. External connector; 52. Fixing plate; 53. Protruding barb; 54. Groove; 6. Base layer; 61. Transition layer; 62. Functional layer; 63. Surface layer; 7. Oil reservoir; 8. Nanopores. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-5 This utility model provides a technical solution: a corrosion-resistant self-tapping bolt, including a bolt cap 1, a threaded section 2 fixedly welded to the bottom of the bolt cap 1, a self-tapping groove 3 formed on the top wall of the bolt cap 1, a drill bit 4 fixedly connected to the end of the threaded section 2, a protective component for protecting the bolt cap 1 installed on the outside of the bolt cap 1, and an outer anti-corrosion component for protecting the bolt installed on the outer wall of the threaded section 2; the protective component includes a protective cap 5, which is adapted to the outer surface of the bolt cap 1, and multiple outer plates 51 are fixedly connected at equal intervals on the bottom wall of the protective cap 5, a fixing plate 52 is fixedly connected to the inner side of the outer wall of the outer plate 51, and multiple protruding barbs 53 are continuously fixedly connected to the top wall of the fixing plate 52, and a groove 54 is formed on the outer wall of the bolt cap 1 corresponding to the fixing plate 52. The protective cap 5 achieves a fit with the bolt cap 1 by engaging the protruding barbs 53 with the groove 54, and a shape memory alloy ring is installed inside the protective cap 5.

[0021] Through the above technical solution, the bolt cap 1 and the threaded section 2 are integrally welded, and the self-tapping groove 3 and the drill bit 4 are used to realize the self-tapping installation connection of the bolt. The bolt achieves its own anti-corrosion effect through the protective component and the outer anti-corrosion component. The protective cap 5 needs to be compatible with the bolt cap 1 so that it can fit on the outside of the bolt cap 1. At the same time, the shape memory alloy ring embedded in the protective cap 5 can further improve the sealing and fastening effect during the bolt installation process.

[0022] Please see Figure 2 and Figure 5 The outer anti-corrosion component includes a base layer 6, a transition layer 61, a functional layer 62 and a surface layer 63 connected sequentially from the inside to the outside; multiple oil storage grooves 7 are provided at the transition position between the outer wall thread of the threaded section 2 and the surface layer 63, and nano-micropores 8 are provided on the inner wall of the oil storage grooves 7, and the oil storage grooves 7 are distributed at intervals along the spiral direction of the thread.

[0023] Through the above technical solution, the substrate layer 6, transition layer 61, functional layer 62 and surface layer 63 are combined in sequence to form a stepped composite protective structure, thereby effectively solving the problem that traditional single coatings are prone to peeling off in acidic and alkaline environments; corrosion-inhibiting grease is injected into the oil reservoir 7, and the oil reservoir 7 deforms during the bolt tightening process, causing the grease to be gradually squeezed out and spread on the surface of the thread section 2, thereby achieving a protective film, blocking the electrochemical corrosion path, and further improving the corrosion resistance of the bolt.

[0024] Please see Figure 2 and Figure 5 The oil storage tank 7 has a trapezoidal structure design that is wider at the top and narrower at the bottom; the base layer 6 is made of low-carbon alloy steel, the transition layer 61 is made of zinc-nickel alloy electroplating material, the functional layer 62 is made of epoxy resin powder coating material, and the surface layer 63 is made of fluorocarbon polymer film material.

[0025] Through the above technical solutions, the oil storage tank 7 is designed with a trapezoidal structure that is wider at the top and narrower at the bottom, which facilitates the processing of the oil tank and the storage of oil; the base layer 6 is made of low-carbon alloy steel, which can improve the resistance to stress corrosion; the transition layer 61 is made of zinc-nickel alloy, which can be preferentially corroded, thereby delaying the corrosion of the base layer 6; the functional layer 62 is made of epoxy resin, which can resist acid and alkali corrosion through the high cross-linking density of epoxy resin; the fluorocarbon material used in the surface layer 63 is resistant to ultraviolet aging and extends the service life outdoors; and the composite-designed outer anti-corrosion components improve the anti-corrosion effect of the bolts themselves.

[0026] Working principle: The bolt cap 1 and threaded section 2 are integrally welded. The drill bit 4 has a pointed design, which allows it to be used with the self-tapping groove 3 to achieve a stable bolt installation connection. The protective cap 5 is adapted to the outer surface of the bolt cap 1 and has an embedded shape memory alloy ring. The protective cap 5 is fixedly connected to the fixing plate 52 through the outer connecting piece 51 on the bottom wall. At the same time, the top wall of the fixing plate 52 has continuous protruding barbs 53. The outer wall of the bolt cap 1 has a groove 54 corresponding to the outer connecting piece 51. The fixing plate 52 and the protruding barbs 53 are inserted into the groove 54 to achieve a fit between the bolt cap 1 and the protective cap 5. At the same time, when the protective cap 5 is deformed under pressure, the shape memory alloy ring tightens, thereby achieving a double seal. The design of the protective cap 5 can protect the bolt cap 1. Meanwhile, a continuous oil reservoir 7 is opened along the thread direction on the outer wall of the threaded section 2. The oil reservoir 7 has a trapezoidal design, which is convenient for processing and oil storage. The corrosion-inhibiting grease is injected into the nanopores 8 of the oil reservoir 7. The grease is adsorbed and fixed by the capillary action of the micropores, forming a stable reservoir. In the storage state, when the bolt is screwed into the connected parts, the thread engagement generates radial pressure, causing micro-plastic deformation of the metal at the root of the thread. The oil reservoir 7 is squeezed and deformed, and the internal corrosion-inhibiting grease is squeezed out. The overflowing grease spreads along the thread contact surface, filling the micro-gap formed after the thread engagement. The corrosion inhibitor reacts with the metal surface to form a protective film, blocking the electrochemical corrosion path, thereby protecting the threaded part of the bolt surface and reducing the impact of corrosion. The outer anti-corrosion component is a stepped composite protective layer. The base layer 6 provides core mechanical support for the bolt, bearing loads and stresses. The transition layer 61 can alleviate the difference in thermal expansion coefficients between the base layer 6 and the functional layer 62, preventing delamination. The functional layer 62 forms a dense barrier, blocking corrosive media such as water and oxygen. The surface layer 63 is a low surface energy material that reduces dirt adhesion and lowers maintenance costs. Through the synergistic effect of the protective component, the outer anti-corrosion component, and the oil reservoir 7, the self-tapping bolt and the connected parts are guaranteed to have their own anti-corrosion effect after installation, improving the service life of the bolt.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant self-tapping bolt, comprising a bolt cap (1), characterized in that: The bottom of the bolt cap (1) is fixedly welded with a threaded section (2), the top wall of the bolt cap (1) is provided with a self-tapping groove (3), the end of the threaded section (2) is fixedly connected with a drill bit (4), a protective component for protecting the bolt cap (1) is installed on the outside of the bolt cap (1), and an external anti-corrosion component for anti-corrosion effect of the bolt is installed on the outer wall of the threaded section (2).

2. The anti-corrosion self-tapping bolt according to claim 1, characterized in that: The protective component includes a protective cap (5), which is adapted to the outer surface of the bolt cap (1). Multiple external plates (51) are fixedly connected at equal intervals on the bottom wall of the protective cap (5). A fixing plate (52) is fixedly connected to the inner side of the outer wall of the external plate (51). Multiple protruding barbs (53) are continuously fixedly connected to the top wall of the fixing plate (52). A groove (54) is provided on the outer wall of the bolt cap (1) corresponding to the fixing plate (52). The protective cap (5) fits the bolt cap (1) by engaging the protruding barbs (53) with the groove (54). A memory alloy ring is installed inside the protective cap (5).

3. The anti-corrosion self-tapping bolt according to claim 1, characterized in that: The outer anti-corrosion component includes a base layer (6), a transition layer (61), a functional layer (62), and a surface layer (63) that are sequentially bonded from the inside out.

4. The anti-corrosion self-tapping bolt according to claim 3, characterized in that: Multiple oil storage grooves (7) are provided at the transition position between the outer wall thread of the threaded section (2) and the surface layer (63). The inner wall of the oil storage grooves (7) is provided with nano-micropores (8). The oil storage grooves (7) are distributed at intervals along the spiral direction of the thread.

5. The anti-corrosion self-tapping bolt according to claim 4, characterized in that: The oil storage tank (7) has a trapezoidal structure design that is wider at the top and narrower at the bottom.

6. The anti-corrosion self-tapping bolt according to claim 4, characterized in that: The substrate layer (6) is made of low-carbon alloy steel, the transition layer (61) is made of zinc-nickel alloy electroplating material, the functional layer (62) is made of epoxy resin powder coating material, and the surface layer (63) is made of fluorocarbon polymer film material.

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