Bolt assembly with anti-corrosion function

Abstract

The utility model relates to the technical field of fasteners, in particular to a bolt assembly with an anti-corrosion function, which comprises a screw rod and a bolt head which are integrally arranged, an oil storage tank is arranged on the bolt head and extends towards the inside of the screw rod, and oil outlets communicated with the oil storage tank are arranged at the head end, the middle end and the tail end of the bolt. A sealing ball is arranged in each oil outlet hole in a sliding mode, a spring is arranged at the end, located in the corresponding oil storage groove, of each oil outlet hole, an opening in the end, located outside the screw rod, of each oil outlet hole is smaller than the diameter of the corresponding sealing ball, and a sealing cover is arranged at the opening, located in the bolt head, of each oil storage groove. A compression part is arranged at the end, located in the oil storage groove, of the sealing cover, and the side wall of the compression part and the side wall of the oil storage groove are arranged in a sealed sliding mode. The lubricating effect of matching of the bolt and the threaded hole can be improved, and the bolt can be prevented from being rusted in the using process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fastener, and specifically to a bolt assembly with anti-corrosion function. BACKGROUND

[0002] As one of the most commonly used fasteners in the field of mechanical connection, the bolt realizes the fixed connection of parts by cooperating with the nut or the threaded hole of the body. The traditional bolt structure is mainly composed of a head and a screw rod, and has obvious anti-corrosion defects in the actual use process. First, the threaded cooperation part is easy to rust due to long-term exposure to a humid environment, resulting in difficult disassembly. Second, the existing anti-corrosion bolt adopts a simple oil outlet hole design, which has problems such as uneven distribution of anti-corrosion oil and complicated oil injection operation. More importantly, the conventional anti-corrosion bolt is prone to anti-corrosion oil leakage in the non-use state, which not only causes resource waste but also pollutes the working environment. In addition, the existing technology lacks an effective oil storage and pressurization mechanism, which makes it difficult for the anti-corrosion oil to fully penetrate the entire threaded cooperation surface, especially after long-term use. These problems seriously affect the service life and disassembly convenience of the bolt, and there is an urgent need to develop a bolt assembly with long-term anti-corrosion function and convenient maintenance. The existing technology needs to be improved in view of the above problems. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a bolt assembly with anti-corrosion function.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a bolt assembly with anti-corrosion function, comprising a screw rod and a bolt head arranged integrally, an oil storage groove is arranged on the bolt head and extends into the screw rod, an oil outlet hole in communication with the oil storage groove is arranged on the head, middle and tail end of the bolt, a sealing ball is slidably arranged in each oil outlet hole, a spring is arranged in the oil outlet hole at one end of the oil storage groove, and the opening of the oil outlet hole at the outer end of the screw rod is smaller than the diameter of the sealing ball, a sealing cover is arranged at the opening of the oil storage groove on the bolt head, a compression member is arranged at one end of the sealing cover in the oil storage groove, and the side wall of the compression member and the side wall of the oil storage groove are sealingly and slidably arranged.

[0005] In some embodiments, the sealing cover and the opening of the oil storage groove on the bolt head are threadedly sealed and fixed.

[0006] In some embodiments, the compression member comprises a balloon and a sealing plug, one end of the balloon is connected with the sealing cover, the other end of the balloon is connected with the sealing plug, and the outer edge of the sealing plug is sealingly and slidably matched with the inner side wall of the oil storage groove.

[0007] In some embodiments, the closed ball is located outside the oil outlet hole, and the distance from the exposed part to the end is less than the height between the thread top and the thread bottom of the screw rod.

[0008] In some embodiments, the closed ball is made of stainless steel.

[0009] In some embodiments, the oil storage tank is filled with rust-proof oil.

[0010] Compared with the prior art, the utility model has the advantages that: through the cooperation of the oil storage tank and the closed ball with the spring, the oil outlet hole is automatically closed to prevent oil leakage when the bolt is not used, and the rust-proof oil is released to the threaded surface through pressure when used, and the detachable closure cover is used to realize convenient oil supplement and maintenance, which effectively prevents the leakage of rust-proof oil in the non-use state, ensures the accurate action of the rust-proof oil on the threaded surface, and realizes convenient maintenance.

[0011] The details of one or more embodiments of the application are presented in the following drawings and description to make the other features, objects and advantages of the application more clear, concise and easy to understand. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a sectional view of the utility model.

[0013] In the figure: 1, screw rod; 2, bolt head; 3, oil storage tank; 4, oil outlet hole; 5, closed ball; 6, spring; 7, closure cover; 8, ball bladder; 9, sealing plug. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0015] In the prior art, the bolt is widely used as a mechanical connecting piece in various devices, and the threaded hole cooperation part is prone to rust due to environmental humidity or chemical corrosion, resulting in difficult disassembly. The traditional rust-proof bolt injects rust-proof oil through the oil outlet hole of the screw rod, but there are problems of uneven oil distribution and easy leakage when not in use, and the oil injection operation needs to repeatedly disassemble the bolt, and the maintenance efficiency is low.

[0016] To solve the above problems, researchers have found that the effective coverage of rust-proof oil and the storage pressure are the key. By analyzing the contact characteristics of the threaded surface, it is found that the oil needs to continuously penetrate into the thread gap during the screwing process. To achieve this goal, an internal oil storage structure needs to be established, and a dynamic opening and closing oil outlet channel needs to be designed. Further research shows that the position of the closing ball can be controlled by using elastic elements to close the oil way when the bolt is not in use, and to trigger the release of oil by mechanical pressure when in use.

[0017] Therefore, as Figure 1 shown, the present application proposes a bolt assembly with anti-rust function, which includes a screw rod and a bolt head, and an oil storage groove extending to the screw rod is arranged in the bolt head. The head, middle and tail ends are provided with oil outlet holes communicating with the oil storage groove. A closing ball is slidably arranged in each oil outlet hole. A spring is arranged at the end of the oil storage groove. The opening at the outer end of the oil outlet hole is smaller than the diameter of the closing ball. A closing cover with a compression element is arranged at the opening of the oil storage groove, and the side wall of the compression element is in sealing sliding fit with the oil storage groove.

[0018] The oil storage groove refers to a cavity extending along the bolt axis for storing rust-proof oil, which can be formed by drilling, and its volume can be adjusted according to the size of the bolt. The oil outlet hole refers to a channel connecting the oil storage groove and the outer surface of the screw rod, which can be distributed radially to ensure that the oil covers the threaded surface. The closing ball refers to a spherical component used to open and close the oil outlet hole, which can be made of stainless steel and has a diameter larger than the outer opening of the oil outlet hole to prevent oil leakage. The spring refers to an element that provides elastic pressure, which can be a coil spring, used to push the closing ball to close the oil outlet hole in the non-use state. The closing cover refers to a component that seals the opening of the oil storage groove, which can be connected by threads for easy maintenance and replenishment of rust-proof oil. The compression element refers to a slidable sealing structure, such as a combination of a balloon and a sealing plug, which changes the pressure in the oil storage groove by external pressure to promote oil flow.

[0019] Specifically, when the bolt is screwed into the threaded hole, the closing ball moves in the direction of the oil storage groove under external pressure, compresses the spring and opens the oil outlet hole. The pre-pressurized rust-proof oil in the oil storage groove is evenly exuded through multiple oil outlet holes to cover the contact surface of the screw rod and the threaded hole. During the continuous screwing process, the oil continuously fills the thread gap under the driving of the pressure. When maintaining, the closing cover is unscrewed, the rust-proof oil can be replenished to the oil storage groove, and the internal pressure is re-established by the compression element.

[0020] Compared with the prior art, the existing rust-proof bolt only relies on a single oil outlet hole for oil supply, which is difficult to achieve uniform distribution of oil, and the lack of pressure maintenance mechanism leads to insufficient penetration depth. The present scheme ensures that the oil forms a continuous oil film on the threaded surface by arranging multiple oil outlet holes and using an internal pressure system, and automatically seals in the non-use state by using the combination of the closing ball and the spring.

[0021] By the technical scheme, the application solves the problems of uneven oil coverage and easy leakage of traditional rust-proof bolts, realizes comprehensive immersion of rust-proof oil on the thread matching surface, and simplifies the rust-proof oil supplement operation, thereby avoiding the maintenance cost caused by repeated disassembly of the bolt.

[0022] The application further proposes that the sealing cover and the opening of the oil storage groove on the bolt head are threadedly sealed and fixed.

[0023] The threadedly sealed and fixed refers to sealing of the opening of the oil storage groove by thread connection, which can be realized by standard thread or tapered thread cooperation, and the thread surface can be additionally provided with sealing glue or rubber gasket to enhance the sealing effect. The sealing cover refers to a component for sealing the opening of the oil storage groove, which can be made of metal or high-strength plastic, and the outer surface can be provided with anti-slip lines to facilitate screwing operation.

[0024] Specifically, the opening of the oil storage groove is processed with internal thread, and the outer surface of the sealing cover is processed with corresponding external thread. After the rust-proof oil is filled for the first time, the sealing cover is screwed into the opening of the oil storage groove, and axial compression is realized by thread cooperation. The radial pressure generated by the spiral structure of the thread during screwing causes the sealing cover to tightly fit the contact surface of the opening of the oil storage groove, forming a sealed interface. When maintenance or rust-proof oil supplement is needed, the sealing cover can be disassembled by reverse rotation, and the bolt structure does not need to be damaged during operation.

[0025] The present application realizes the threadedly sealed and fixed function, which not only ensures the sealing reliability, but also realizes the repeated disassembly function of the sealing cover, facilitates the regular supplement of rust-proof oil, and avoids oil leakage caused by sealing failure.

[0026] By the technical scheme, the application solves the problem of non-disassembly of the sealing structure of the existing bolt oil storage cavity, makes the rust-proof oil supplement operation more convenient, reduces the damage risk of the bolt body during maintenance, and prolongs the service life of the bolt assembly.

[0027] The application further proposes that the compression member includes a balloon and a sealing plug, one end of the balloon is connected with the sealing cover, the other end of the balloon is connected with the sealing plug, and the outer edge of the sealing plug is in sealing sliding cooperation with the inner side wall of the oil storage groove.

[0028] The balloon refers to a balloon-shaped structure with elasticity, which can be made of rubber or silicone material, and the inside can be injected with compressed air or the elastic pressure of the structure itself, which is used to generate compression deformation when the sealing cover is tightened, to push the sealing plug to move to the inside of the oil storage groove to form pressure. The sealing plug refers to a cylindrical component in sliding cooperation with the inner wall of the oil storage groove, which can be made of polytetrafluoroethylene or nylon material, and the edge is provided with an annular sealing ring, which is used to maintain the pressure inside the oil storage groove and prevent rust-proof oil leakage during sliding.

[0029] Specifically, when the closure cap is screwed into the oil groove opening, the balloon is axially extruded to produce elastic deformation, pushing the sealing plug to slide along the inner wall of the oil groove to the inside. The sliding of the sealing plug compresses the space inside the oil groove, so that the rust-proof oil is in a pressurized state. When the bolt is installed, the closure ball is pushed into the oil outlet hole, and the pressurized rust-proof oil is evenly exuded to the contact area between the screw rod and the threaded hole through the oil outlet hole.

[0030] Compared with the prior art, the present scheme can realize uniform increase of the internal pressure of the oil groove by the elastic deformation of the balloon and the sliding cooperation of the sealing plug, while avoiding the risk of sealing failure caused by friction of rigid parts.

[0031] Through the above technical scheme, the present application solves the problem of insufficient rust-proof oil exudation or local leakage caused by unstable pressurization of the traditional bolt oil storage cavity, ensures the formation of a continuous oil film on the contact surface between the screw rod and the threaded hole, and reduces the repeated oiling demand caused by sealing failure during maintenance.

[0032] The present application further proposes that the exposed part of the closure ball at one end outside the oil outlet hole has a distance less than the height between the thread top and the thread bottom of the screw rod.

[0033] The exposed part distance of the closure ball refers to the vertical distance between the part of the closure ball outside the oil outlet hole and the surface of the screw rod, which can be realized by adjusting the depth of the oil outlet hole or the size of the closure ball. This design is used to avoid the interference of the closure ball with the threaded hole or the nut when the bolt is not in use due to excessive exposure. The height between the thread top and the thread bottom refers to the vertical distance between the thread top and the adjacent thread bottom, which can be realized by standard thread processing parameters. This parameter is used as a reference to define the size range of the exposed part of the closure ball, so as to ensure that the closure ball does not exceed the height range of the threaded structure.

[0034] Specifically, when the bolt is installed into the threaded hole or cooperates with the nut, the closure ball is pushed into the oil outlet hole by the external structure. At this time, the size of the exposed part of the closure ball is limited within the range of the height between the thread top and the thread bottom, so that the closure ball does not hinder the normal engagement of the thread during the pressure movement due to excessive exposure. At the same time, this design ensures that the exposed part of the closure ball is always in the recessed area of the threaded structure when the rust-proof oil is released through the oil outlet hole, avoiding friction or collision with the mating surface.

[0035] Compared with the prior art, the present scheme defines the relationship between the exposed size of the closure ball and the height of the thread, which not only ensures the normal opening of the oil outlet hole when the closure ball is under pressure, but also avoids the problem of structural interference caused by excessive exposure.

[0036] By the technical scheme, the compatibility between the exposed part of the closing ball and the thread matching structure is solved, the stable opening of the rust-proof oil release channel during the bolt installation process is ensured, and the thread engagement failure or the rust-proof oil leakage in advance caused by the protrusion of the closing ball is avoided, thereby improving the reliability of the bolt rust-proof function.

[0037] The application further proposes that the closing ball is made of a stainless steel ball.

[0038] The stainless steel ball refers to a spherical component made of stainless steel material, which can be realized by using austenitic stainless steel or martensitic stainless steel. The stainless steel material has corrosion resistance and high hardness, and can avoid rusting or deformation when in long-term contact with rust-proof oil and external environment.

[0039] Specifically, when the closing ball slides in the oil outlet hole, the stainless steel material can withstand the continuous pressure of the spring and the friction generated by the thread matching, avoiding deformation or wear of the ball due to insufficient material strength. When the bolt is installed into the threaded hole, the closing ball is pushed into the inside of the oil outlet hole, at this time the surface of the stainless steel ball contacts the opening edge of the oil outlet hole, and its corrosion resistance can prevent the contact surface from sticking due to rust, ensuring that the closing ball can be smoothly reset under the action of the spring.

[0040] The stainless steel ball directly solves the durability problem of the closing component by material selection, while avoiding the introduction of additional structures or coating processes.

[0041] By the technical scheme, the application can ensure that the closing ball maintains stable sealing performance during long-term use of the bolt, avoiding rust-proof oil leakage or oil outlet hole blockage caused by material corrosion, thereby improving the reliability and maintenance period of the bolt assembly.

[0042] The application further proposes that the oil storage groove is filled with rust-proof oil, and when the bolt is used for the first time, the rust-proof oil is first filled, then the closing cover is closed with the opening of the oil storage groove, and the oil storage groove is pressurized by the compression member. When the bolt is used, the closing ball will be pushed into the oil outlet hole, so that the opening of the oil outlet hole is opened, and the rust-proof oil with pressure will enter the matching place of the screw rod and the threaded hole. When the screw rod continues to rotate, it can ensure that the matching place of the screw rod and the threaded hole is filled with rust-proof oil. After the equipment is used for a period of time, during maintenance, the bolt is removed and the closing cover is opened to refill the rust-proof oil in the oil storage groove.

[0043] The oil storage groove refers to a cavity structure extending from the bolt head to the inside of the screw rod, used for storing rust-proof oil, and can be formed by drilling or casting process, and its volume can be adjusted according to the size of the bolt. The concentrated storage and pressure transmission of the rust-proof oil are realized through the oil storage groove. The rust-proof oil refers to oil liquid with lubricating and rust-proof functions, which can be specifically mineral oil or synthetic oil-based material, and rust-proof agent is added to improve the corrosion resistance, and a continuous oil supply source is formed by filling the oil storage groove. The sealing cover refers to a component for sealing the opening of the oil storage groove, which can be specifically a threaded metal cover, and the sealing is realized by rotating and fixing to prevent the rust-proof oil from leaking and maintain the internal pressure. The compression member refers to a movable sealing structure arranged in the oil storage groove, which can be specifically a combination of an elastic balloon and a sealing plug, and the volume of the oil storage groove is changed by compression under external force, so as to apply pressure to the rust-proof oil.

[0044] Specifically, at the first assembly, the rust-proof oil is injected into the oil storage groove until it is filled, and then the sealing cover is fixed at the opening by threaded connection. At this time, the compression member is extruded by the sealing cover to deform, so that the initial pressure is formed in the oil storage groove. When the bolt is screwed into the threaded hole, the sealing ball is extruded by the inner wall of the threaded hole and slides into the oil outlet hole, the opening of the oil outlet hole is opened, and the rust-proof oil in the oil storage groove is evenly exuded through the multiple oil outlet holes, and covers the threaded mating surface as the screw rotates. In the equipment maintenance stage, after the bolt is disassembled, the sealing cover is unscrewed, the rust-proof oil is supplemented to full through the opening of the oil storage groove, and then it is resealed and pressurized to complete the maintenance operation.

[0045] Compared with the prior art, the existing bolt is only passively exuded through a simple oil outlet hole, which cannot ensure that the oil liquid uniformly covers the threaded mating surface, and the entire replacement or external oil injection is required during maintenance. The present scheme controls the pressure of the oil storage groove and the compression member, so that the rust-proof oil is actively exuded and diffused during installation, ensuring that the threaded contact area is completely immersed. During maintenance, only the bolt needs to be disassembled and the oil liquid needs to be supplemented, without the need to replace parts or use external oil injection tools.

[0046] Through the above technical scheme, the present application solves the problems of uneven rust-proof oil coverage and inconvenient maintenance of the existing bolt, realizes comprehensive rust-proof protection of the threaded mating surface through the active oil supply mechanism driven by pressure, simplifies the maintenance process, and restores the rust-proof function by repeatedly filling the oil storage groove, thereby significantly prolonging the service life of the bolt.

[0047] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of protection of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

[0048] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A bolt assembly with anti-corrosion function, comprising an integrally formed bolt shank and bolt head, characterized in that: An oil reservoir is provided on the bolt head extending into the screw. The head, middle and tail ends of the bolt are provided with oil outlet holes communicating with the oil reservoir. A sealing ball is slidably disposed in each oil outlet hole. A spring is provided at one end of the oil outlet hole located in the oil reservoir, and the opening of the oil outlet hole located outside the screw is smaller than the diameter of the sealing ball. A sealing cap is provided at the opening of the oil reservoir on the bolt head. A compression member is provided at one end of the sealing cap located in the oil reservoir. The side wall of the compression member is slidably and sealed with the side wall of the oil reservoir.

2. A bolt assembly with anti-corrosion function according to claim 1, characterized in that: The sealing cover and the oil storage tank are fixed by a threaded seal at the opening on the bolt head.

3. A bolt assembly with anti-corrosion function according to claim 1, characterized in that: The compression component includes a balloon and a sealing plug. One end of the balloon is connected to a sealing cap, and the other end of the balloon is connected to the sealing plug. The outer edge of the sealing plug is in a sealing sliding fit with the inner wall of the oil reservoir.

4. A bolt assembly with anti-corrosion function according to claim 1, characterized in that: The distance between the exposed end of the closed ball outside the oil outlet and the height between the thread crest and the pressure bottom of the screw is less than the distance between the thread crest and the pressure bottom of the screw.

5. A bolt assembly with anti-corrosion function according to claim 1, characterized in that: The enclosed sphere is made of stainless steel.

6. A bolt assembly with anti-corrosion function according to claim 1, characterized in that: The oil storage tank is filled with rust-preventive oil.

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