Anti-corrosion copper nut and preparation method thereof

Abstract

According to the technical scheme, the anti-corrosion copper nut is characterized by comprising a nut body, sealing sleeves are arranged at the two ends of the nut body, sealing plates are arranged at one ends of the sealing sleeves, sealing gaskets are arranged on the inner walls of the sealing plates, and the multiple sealing plates can elastically deform towards the circle center to form sealing heads concentric with a round hole; the nut body is further provided with a pair of locking sleeves connected with the sealing sleeves in a sliding mode, a driving mechanism is arranged between the locking sleeves and the sealing plates, and the driving mechanism is used for driving the sealing plates to form a sealing head with the peripheral side sealed. Through the structure, the sealing sleeves enhance the tightness of threaded connection, and through the design of the sealing plate and the sealing gasket on the sealing sleeves, under the action of the locking sleeve, a sealing head for peripheral sealing can be formed, a corrosive medium is effectively prevented from entering a thread gap, the direct contact opportunity of the corrosive medium and a metal matrix is reduced, and the service life of the sealing sleeve is prolonged. Therefore, the risk of inner side corrosion is indirectly reduced, and the corrosion phenomenon is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of nut accessories, and in particular to an anti-corrosion copper nut and a preparation method thereof. Background Art

[0002] Copper nuts are a type of metal threaded connector, usually made of copper alloy materials with excellent corrosion resistance. These alloys add other metal elements, such as lead, tin, zinc, etc., to copper, and improve the corrosion resistance of the material through alloying. Due to its good corrosion resistance, it is generally used in fields that require corrosion resistance, rust resistance, and resistance to high humidity and highly corrosive environments, such as marine engineering, chemical industry, water treatment, construction, aerospace, etc.; at the same time, in order to improve the corrosion and rust resistance of the nut, a coating or plating will be set on the surface of the nut to improve the corrosion resistance of the nut.

[0003] However, in actual use, especially in high-salt environments such as marine engineering, the chloride ions in the salt have a strong corrosive effect on metals and can penetrate the coating or plating to react with the metal matrix. Therefore, the existing copper nut plating will still be corroded during use. In particular, some seawater or corrosive media will penetrate into the inside of the nut along the gap of the thread, causing corrosion at the connection between the nut and the bolt. In addition, when the copper nut is screwed into the bolt, the outer thread of the bolt will rub against the inner thread of the nut, thereby causing damage to the inner coating of the nut, which will further cause corrosion on the inside of the nut, thereby affecting the subsequent use of the nut and the connection strength. Summary of the invention

[0004] The invention provides an anti-corrosion copper nut and a preparation method thereof, which solves the inner nut problem of nuts in the related art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an anti-corrosion copper nut, including a nut body, a circular hole with a locking thread on the inner wall of the nut body, sealing sleeves with locking threads concentrically matched with the circular hole are provided at both ends of the nut body, a plurality of arc-shaped sealing plates are provided at the end of the sealing sleeve away from the nut body, a sealing gasket is provided on the inner wall of the sealing plate, and the plurality of sealing plates are distributed at equal distances along the circumference of the sealing sleeve and can be elastically deformed toward the center of the circle to form a sealing head concentric with the circular hole; a pair of locking sleeves slidably connected to the sealing sleeve are also provided on the nut body, the locking sleeve is sleeved on the outer side of the circumference of the sealing head and a driving mechanism is provided between the locking sleeve and the plurality of sealing plates, and the driving mechanism is used to drive the plurality of sealing plates to deform toward the center of the circle to form a sealing head with circumferential side sealing when the locking sleeve slides toward the sealing head.

[0006] The present invention is further configured such that the driving mechanism includes a driving member A and a driving member B, the locking sleeve includes a locking cylinder A arranged on the side of the nut body away from the bolt and a locking cylinder B arranged on the side of the nut body close to the bolt, the driving member A cooperates with the locking cylinder A, and the driving member B cooperates with the locking cylinder B, when the locking cylinder A drives the driving member A to slide in the direction away from the nut body, it drives several sealing plates to deform, and when the locking cylinder B drives the driving member B to slide in the direction close to the nut body, it drives several sealing plates to deform.

[0007] The present invention is further configured such that the driving member A includes an extrusion block A arranged on the inner wall of the locking cylinder A, the cross-section of the extrusion block A is a conical structure, the inner diameter of the conical structure gradually decreases along the sealing plate toward the nut body, and the extrusion block A abuts against a plurality of sealing plates.

[0008] The present invention is further configured such that the driving member B includes an extrusion block B arranged on the inner wall of one end of the locking cylinder B away from the nut body, the extrusion block B has a conical cross-section, and the inner diameter of the conical structure gradually decreases along the nut body toward the sealing plate.

[0009] The present invention is further configured such that an abutment ring A abutting against the extrusion block A is provided on the outer side of one end of the sealing plate away from the nut body, and a sealing ring abutting against the abutment ring A is provided on the inner wall of the extrusion block A.

[0010] The present invention is further configured such that an abutment ring B abutting against the extrusion block B is provided on the outer side of one end of the sealing plate away from the nut body, and a sealing ring abutting against the abutment ring B is provided on the inner wall of the extrusion block B.

[0011] The present invention is further configured such that a connecting hole is provided on the nut body, a connecting rod is slidably connected in the connecting hole, and the locking cylinder A is connected to the locking cylinder B through the connecting rod.

[0012] The present invention is further configured such that the nut is made of copper alloy, the nut body and the locking sleeve are integrally formed, and the outer surfaces of the nut body and the locking sleeve and the inner wall of the circular hole are coated with an anti-corrosion and wear-resistant coating.

[0013] A method for preparing an anti-corrosion copper nut, used for preparing an anti-corrosion copper nut, comprises the following steps: S1. Take copper, aluminum, chromium, iron, manganese, nickel, silicon and zinc, melt them at 750-900°C, cool them to 200-250°C, and keep them warm for 2-4 hours to obtain an alloy solution; introduce argon gas for degassing to obtain a degassed alloy melt; pour the degassed alloy melt into a mold, cool it, and perform heat treatment to obtain a copper alloy block; S2, processing the copper alloy block obtained in S1 by lathe and drilling to obtain a nut body with a sealing sleeve, a locking cylinder A and a locking cylinder B, and a connecting rod; S3, chamfering the nut body processed in S2, and grinding and polishing it together with the locking cylinder; S3, using a grinding wheel to clean the surface of the nut body and the locking cylinder after grinding and polishing through pickling and sandblasting cleaning processes; S4, take modified fluorinated graphene, titanium boride-silicon dioxide, and xylene, and ultrasonically disperse for 15-20 minutes to obtain a mixed solution; take epoxy resin and xylene, stir evenly, add the mixed solution, continue stirring for 2-3 hours, add isocyanate curing agent, mix evenly, and let stand for 20-30 minutes to obtain an anti-corrosion and wear-resistant coating; S5, applying the anti-corrosion and wear-resistant coating prepared in S4 to the cleaned nut body surface, inner side, locking cylinder and connecting rod, and then drying to obtain a nut accessory with an anti-corrosion and wear-resistant coating on the surface; S6. Prepare sealing rings and sealing gaskets according to the nut accessories prepared in S5; S7, assembling the nut accessory coated with the anti-corrosion and wear-resistant coating in S5 with the prepared sealing ring and sealing gasket to obtain a finished nut.

[0014] The present invention is further configured such that, in step S7, the locking cylinder A and the locking cylinder B are connected and fixed by welding with a connecting rod.

[0015] In summary, the beneficial effects of the present invention are: Compared with the prior art, the present invention provides sealing sleeves with locking threads that are concentric with the circular hole at both ends of the nut body. These sealing sleeves not only enhance the tightness of the threaded connection, but also form a sealing head with circumferential sealing through the design of the sealing plate and the sealing gasket thereon under the action of the locking sleeve, effectively blocking the corrosive medium from entering the thread gap, reducing the direct contact between the corrosive medium and the metal substrate, thereby indirectly reducing the risk of internal corrosion and avoiding the occurrence of corrosion.

[0016] At the same time, by coating the nut surface with an anti-corrosion and wear-resistant coating, the coating contains modified fluorinated graphene, which has excellent corrosion resistance due to its unique chemical structure, especially against corrosive media such as acid, alkali, and salt. Therefore, the addition of modified fluorinated graphene can significantly improve the corrosion resistance of the coating, making it perform better in the salt corrosion environment of the seaside. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the first embodiment.

[0018] Figure 2It is an exploded view of the first embodiment.

[0019] Figure 3 It is a partial cross-sectional view of the first embodiment.

[0020] Figure 4 It is a cross-sectional structural diagram of the first embodiment.

[0021] Figure markings: 1. nut body; 2. round hole; 3. locking thread; 4. sealing sleeve; 5. sealing plate; 6. sealing gasket; 7. locking sleeve; 71. locking cylinder A; 72. locking cylinder B; 81. driving member A; 811. extrusion block A; 812. abutment ring A; 813. sealing ring; 82. driving member B; 821. extrusion block B; 822. abutment ring B; 9. connecting hole; 10. connecting rod. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention. Example

[0023] like Figure 1-4 As shown, this embodiment discloses an anti-corrosion copper nut, including a nut body 1 made of copper alloy, a circular hole 2 with a locking thread 3 on the inner wall of the nut body 1, and sealing sleeves 4 with locking threads 3 coaxially matched with the circular hole 2 are provided at both ends of the nut body 1. Bolts can pass through the nut body 1 and the sealing sleeve 4 and be connected with them through threads.

[0024] like Figure 1-2 As shown, a plurality of arc-shaped sealing plates 5 are arranged at one end of the sealing sleeve 4 away from the nut body 1, and a sealing gasket 6 is arranged on the inner wall of the sealing plate 5. The plurality of sealing plates 5 are distributed equidistantly along the circumference of the sealing sleeve 4 and can be elastically deformed toward the center of the circle to form a sealing head concentric with the circular hole 2; the sealing head is a cylindrical structure, and when not installed, the plurality of sealing plates 5 are expanded outward under the action of their own elastic force, so that the bolts can pass through normally. The nut body 1 is also provided with a pair of locking sleeves 7 slidably connected to the sealing sleeve 4, and the locking sleeve 7 is sleeved on the outer side of the circumference of the sealing head and a driving mechanism is arranged between the locking sleeve 7 and the plurality of sealing plates 5.

[0025] The driving mechanism includes a driving member A81 and a driving member B82, and the locking sleeve 7 includes a locking cylinder A71 arranged on the side of the nut body 1 away from the bolt and a locking cylinder B72 arranged on the side of the nut body 1 close to the bolt; the driving member A81 includes an extrusion block A811 arranged on the inner wall of the locking cylinder A71, and the cross-section of the extrusion block A811 is a conical structure, and the inner diameter of the conical structure gradually decreases along the sealing plate 5 toward the nut body 1, wherein the locking cylinder A71 and the extrusion block A811 are located between the sealing head and the nut body 1, and when it is necessary to extrude a number of sealing plates 5 to shrink and fit them, the locking cylinder A71 will drive the extrusion block A811 to move away from the sealing head, so that the annular extrusion block A811 squeezes the circumferential sides of the number of sealing plates 5, thereby allowing the sealing plate 5 to form a cylindrical sealing head to achieve a fitting seal on the external thread of the bolt.

[0026] like Figure 3-4 As shown, the driving member B82 includes an extrusion block B821 arranged on the inner wall of the end of the locking cylinder B72 away from the nut body 1. The cross-section of the extrusion block B821 is a conical structure, and the inner diameter of the conical structure gradually decreases along the nut body 1 toward the sealing plate 5. The extrusion block B821 and the locking cylinder B72 are located at the other end of the nut body 1 relative to the driving member A81, and the extrusion block B821 is located at the end of the sealing head away from the nut body 1. When the sealing plate 5 needs to be contracted to form a cylindrical sealing head, the user can drive the locking cylinder B72 to drive the extrusion block B821 to slide in the direction of the nut body 1, so that the extrusion block gradually squeezes the sealing plate 5, so that the sealing plate 5 shrinks inward to form a sealing head with a circumferential seal.

[0027] A sealing gasket 6 is provided on the inner wall of the sealing plate 5. When the sealing plate 5 is deformed toward the bolt and is tightly attached to the bolt, the sealing gasket 6 can fit with the external thread of the bolt, thereby sealing and blocking the gap between the sealing plate 5 and the bolt, thereby improving the sealing effect to prevent corrosive substances such as seawater from penetrating into the inner side of the nut along the gap of the thread and directly contacting the thread of the nut to cause corrosion at the connection between the thread and the bolt.

[0028] like Figure 2 As shown, on the basis of the above, a contact ring A812 that abuts against the extrusion block A811 is provided on the outer side of one end of the sealing plate 5 corresponding to the position of the locking cylinder A71 and away from the nut body 1, and a sealing ring 813 that abuts against the abutment ring A812 is provided on the inner wall of the extrusion block A811.

[0029] An abutment ring B822 abutting against the extrusion block B821 is arranged on the outer side of one end of the sealing plate 5 corresponding to the position of the locking cylinder B72 and away from the nut body 1, and a sealing ring 813 abutting against the abutment ring B822 is arranged on the inner wall of the extrusion block B821.

[0030] The cross-section of the abutment ring A812 is a cone that fits tightly with the extrusion block A811, and the cross-section of the abutment ring B822 is a cone that fits tightly with the extrusion block B821. When the extrusion block slides toward the abutment ring, the extrusion block will abut and seal with the abutment ring, thereby sealing the gap at the end of the sealing head, avoiding corrosion of the sealing gasket 6 caused by contact between corrosive substances and the sealing gasket 6, thereby further improving the sealing effect.

[0031] A connecting hole 9 is provided on the nut body 1, and a connecting rod 10 is slidably connected in the connecting hole 9. The locking cylinder A71 and the locking cylinder B72 are connected through the connecting rod 10. The connecting rod 10 is slidably connected to the connecting hole 9, and the locking cylinder A71 and the locking cylinder B72 can be linked through the connecting rod 10.

[0032] like Figure 1 , 3 As shown in Figure 4, when the staff needs to screw the nut onto the bolt to connect the equipment, first, the end of the nut with the locking tube B72 is facing the end of the bolt screwing direction, and then the bolt is aligned with the circular hole 2 on the nut body 1, and the nut body 1 is screwed with a tool such as a wrench. The nut body 1 will be screwed into the bolt due to the locking thread 3 in the circular hole 2 cooperating with the external thread of the bolt, thereby tightening the nut. When the nut moves to the tightening position, the locking cylinder B72 of the nut body 1 will abut against the product or the end of the bolt. At this time, the staff continues to control the nut body 1 and rotates it in the tightening direction. At this time, the locking cylinder B72 abuts against the product. Therefore, during the tightening process of the bolt, the locking cylinder B72 will be pushed toward the nut body 1. During the pushing process of the locking cylinder B72, the locking cylinder B72 will drive the extrusion block B821 to move toward the sealing plate 5. Since the extrusion block B821 is conical, the extrusion block B821 will drive the sealing plate 5 to deform toward the bolt until the sealing plate 5 is tightly attached to the external thread of the bolt to form a cylindrical sealing head to achieve a tight sealing of the nut, thereby achieving a sealing effect. At this time, the extrusion block B821 will abut against the abutment ring B822 of the sealing head to achieve sealing of the end of the sealing head.

[0033] At the same time, since the locking cylinder B72 is connected to the locking cylinder A71 through the connecting rod 10, when the locking cylinder B72 moves toward the nut body 1, it will drive the locking cylinder A71 to move away from the bolt body, and then the locking cylinder A71 will drive the extrusion block A811 to abut against the abutment ring A812, and at the same time drive the sealing plate 5 to deform toward the bolt direction, thereby realizing the sealing of the nut body 1 away from the bolt end, thereby preventing the corrosive medium from entering the connection between the nut and the bolt along the threaded gap between the bolt and the nut, causing corrosion at the nut connection to improve the corrosion resistance.

[0034] Furthermore, since the sealing plate 5 squeezes the external thread of the bolt, locking between the bolt and the nut can be achieved, thereby preventing the nut from loosening due to vibration of the nut and the bolt, thereby improving the stability and firmness of the equipment connection.

[0035] The nut is made of copper alloy, the nut body 1 and the locking sleeve 7 are integrally formed, and the outer surfaces of the nut body 1 and the locking sleeve 7 and the inner wall of the circular hole 2 are coated with an anti-corrosion and wear-resistant coating. The anti-corrosion and wear-resistant coating can improve the anti-corrosion effect of the nut to improve the corrosion resistance of the nut. Example

[0036] In order to prepare the anti-corrosion copper nut of Example 1, this embodiment provides a method for preparing the anti-corrosion copper nut, comprising the following steps: S1. Take copper, aluminum, chromium, iron, manganese, nickel, silicon and zinc, melt them at 750-900°C, cool them to 200-250°C, and keep them warm for 2-4 hours to obtain an alloy solution; introduce argon gas for degassing to obtain a degassed alloy melt; pour the degassed alloy melt into a mold, cool it, and perform heat treatment to obtain a copper alloy block; Various metal elements such as copper, aluminum, chromium, iron, manganese, nickel, silicon, zinc, etc. are melted and mixed at high temperature to form an alloy. The addition of these elements changes the microstructure of copper, forming a more compact and stable alloy phase, and improving the corrosion resistance of the material. In particular, the addition of elements such as chromium and nickel can form a dense oxide film on the metal surface, which effectively blocks the erosion of corrosive media. The copper nuts prepared using the above alloys can have better corrosion resistance and increase the service life of the nuts.

[0037] Each element is melted between 750-900℃, which ensures that all metal elements involved in alloying can be fully melted and mixed evenly. Too low a temperature may cause some metals to not melt completely, while too high a temperature may cause unnecessary chemical reactions or metal evaporation.

[0038] The step of cooling to 200-250℃ and keeping it for 2-4 hours is called "homogenization" or "annealing". Keeping it in this temperature range for a period of time helps to homogenize and refine the internal structure of the alloy, reduce internal stress, and improve the mechanical properties and processing properties of the alloy. The length of the holding time depends on the composition of the alloy and the required organizational state.

[0039] S2, the copper alloy block obtained in S1 is processed and drilled by a lathe to obtain a nut body 1 with a sealing sleeve 4, a locking cylinder A71 and a locking cylinder B72, and a connecting rod 10; S3, chamfering the nut body 1 processed in S2, and grinding and polishing it together with the locking cylinder; S3, using a grinding wheel to clean the surfaces of the nut body 1 and the locking cylinder after grinding and polishing through pickling and sandblasting cleaning processes; Through lathe processing, grinding, polishing and other steps, the burrs and rough parts on the nut surface are removed, and the surface finish and precision are improved. At the same time, the surface is deeply cleaned by using grinding wheel, pickling, sandblasting and other processes to remove the oil and impurities on the surface, which provides a good foundation for the subsequent coating adhesion, can effectively improve the quality of the coating and the adhesion on the copper nut surface, and avoid the coating from falling off during use.

[0040] S4, take modified fluorinated graphene, titanium boride-silicon dioxide, and xylene, and ultrasonically disperse for 15-20 minutes to obtain a mixed solution; take epoxy resin and xylene, stir evenly, add the mixed solution, continue stirring for 2-3 hours, add isocyanate curing agent, mix evenly, and let stand for 20-30 minutes to obtain an anti-corrosion and wear-resistant coating; High-performance materials such as modified fluorinated graphene and titanium boride-silicon dioxide are added to the anti-corrosion and wear-resistant coating. Due to its unique chemical structure, fluorinated graphene has excellent corrosion resistance, especially against corrosive media such as acids, alkalis, and salts. Therefore, the addition of modified fluorinated graphene can significantly improve the corrosion resistance of the coating, making it perform better in the salt corrosion environment of the seaside.

[0041] The preparation method of modified fluorinated graphene is as follows: Take 0.1g of fluorinated graphene and 300mL of deionized water, and ultrasonically disperse for 25 minutes to obtain a fluorinated graphene mixed solution; ultrasonic dispersion is an effective physical method for uniformly dispersing solid particles in liquid. The dispersion time of 25 minutes is sufficient for the fluorinated graphene to form a stable dispersion system in deionized water; and sufficient dispersion helps the fluorinated graphene and aniline trimer to contact and react more uniformly, improving the modification effect. Take 0.5g of aniline trimer and 50mL of deionized water, stir evenly, add fluorinated graphene mixture, and stir at 80℃ for 30min. The choice of 80℃ may be based on the moderate reaction rate, good product stability and avoidance of side reactions that may occur at high temperature; and the 30min stirring time is enough for the fluorinated graphene mixture to fully contact and react with the aniline trimer. Wash, filter and dry to obtain modified fluorinated graphene.

[0042] The amount of 0.1 g of fluorinated graphene not only ensures a certain concentration of fluorinated graphene in the mixed solution, but also avoids waste or handling difficulties caused by excessive amounts; The deionized water is divided into two parts: 300ml and 50ml. 300ml is used for dispersing graphene fluoride, providing enough space for the graphene fluoride to be evenly dispersed; 50ml is used for dissolving aniline trimer, which not only ensures the adequacy of dissolution, but also avoids the solution from being too diluted.

[0043] The two components, titanium boride and silicon dioxide, mainly contribute to the hardness and wear resistance of the coating. Although their direct contribution to corrosion resistance may not be as significant as that of fluorinated graphene, they enhance the overall stability and durability of the coating, helping the coating to maintain its performance for a long time in a seaside environment.

[0044] These materials are evenly dispersed in the coating and tightly combined with base materials such as epoxy resin to form a strong and corrosion-resistant coating, further enhancing the corrosion resistance of the nut.

[0045] S5, applying the anti-corrosion and wear-resistant coating prepared in S4 to the surface, inner side, locking cylinder and connecting rod 10 of the cleaned nut body 1 and drying the coating to obtain a nut accessory with an anti-corrosion and wear-resistant coating on the surface; Coating the above-mentioned coating on the surface of the nut can effectively increase the service life of the copper nut in high-salt environments such as marine engineering, thereby improving the stability and firmness of the equipment connection.

[0046] S6, prepare the sealing ring 813 and the sealing gasket 6 according to the nut accessories prepared in S5; S7, assembling the nut accessory coated with the anti-corrosion and wear-resistant coating in S5 with the prepared sealing ring 813 and sealing gasket 6 to obtain a finished nut.

[0047] In step S7, the locking cylinder A71 and the locking cylinder B72 are connected and fixed by welding with the connecting rod 10; the locking copper A and the locking cylinder B72 are welded with the connecting rod 10, which can ensure the firm connection between the two locking cylinders and facilitate the assembly of the nuts; and after the locking cylinder and the connecting rod 10 are welded, an anti-corrosion and wear-resistant coating is applied at the connection to improve the corrosion resistance of the connection.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-corrosion copper nut, comprising a nut body (1), wherein the nut body (1) is provided with a circular hole (2) having an inner wall with a locking thread (3), characterized in that: Both ends of the nut body (1) are provided with sealing sleeves (4) which are concentrically matched with the circular hole (2) and have locking threads (3); one end of the sealing sleeve (4) away from the nut body (1) is provided with a plurality of arc-shaped sealing plates (5); the inner wall of the sealing plate (5) is provided with a sealing gasket (6); the plurality of sealing plates (5) are equidistantly distributed along the circumference of the sealing sleeve (4) and can be elastically deformed toward the center of the circle to form a sealing head concentric with the circular hole (2); the nut body (1) is also provided with a pair of locking sleeves (7) which are slidably connected to the sealing sleeve (4); the locking sleeve (7) is sleeved on the outer side of the circumference of the sealing head and a driving mechanism is provided between the locking sleeve (7) and the plurality of sealing plates (5); the driving mechanism is used to drive the plurality of sealing plates (5) to deform toward the center of the circle to form a sealing head that seals the circumference when the locking sleeve (7) slides toward the sealing head.

2. The anti-corrosion copper nut according to claim 1, characterized in that: The driving mechanism comprises a driving member A (81) and a driving member B (82); the locking sleeve (7) comprises a locking cylinder A (71) arranged on a side of the nut body (1) away from the bolt and a locking cylinder B (72) arranged on a side of the nut body (1) close to the bolt; the driving member A (81) cooperates with the locking cylinder A (71); the driving member B (82) cooperates with the locking cylinder B (72); when the locking cylinder A (71) drives the driving member A (81) to slide in a direction away from the nut body (1), the plurality of sealing plates (5) are deformed; when the locking cylinder B (72) drives the driving member B (82) to slide in a direction close to the nut body (1), the plurality of sealing plates (5) are deformed.

3. The anti-corrosion copper nut according to claim 2, characterized in that: The driving member A (81) comprises an extrusion block A (811) arranged on the inner wall of the locking cylinder A (71); the extrusion block A (811) has a conical cross-section, the inner diameter of the conical structure gradually decreases along the sealing plate (5) toward the nut body (1); the extrusion block A (811) abuts against a plurality of sealing plates (5).

4. The anti-corrosion copper nut according to claim 2, characterized in that: The driving member B (82) comprises an extrusion block B (821) arranged on the inner wall of an end of the locking cylinder B (72) away from the nut body (1); the extrusion block B (821) has a conical structure in cross section, and the inner diameter of the conical structure gradually decreases along the nut body (1) towards the sealing plate (5).

5. The anti-corrosion copper nut according to claim 3, characterized in that: An abutment ring A (812) abutting against the extrusion block A (811) is provided on the outer side of one end of the sealing plate (5) away from the nut body (1), and a sealing ring (813) abutting against the abutment ring A (812) is provided on the inner wall of the extrusion block A (811).

6. The anti-corrosion copper nut according to claim 4, characterized in that: An abutment ring B (822) abutting against an extrusion block B (821) is provided on the outer side of one end of the sealing plate (5) away from the nut body (1), and a sealing ring (813) abutting against the abutment ring B (822) is provided on the inner wall of the extrusion block B (821).

7. An anti-corrosion copper nut according to any one of claims 2 to 6, characterized in that: The nut body (1) is provided with a connecting hole (9), a connecting rod (10) is slidably connected in the connecting hole (9), and the locking cylinder A (71) and the locking cylinder B (72) are connected via the connecting rod (10).

8. The anti-corrosion copper nut according to claim 2, characterized in that: The nut is made of copper alloy, the nut body (1) and the locking sleeve (7) are integrally formed, and the outer surfaces of the nut body (1), the locking sleeve (7) and the inner wall of the circular hole (2) are all coated with an anti-corrosion and wear-resistant coating.

9. A method for preparing an anti-corrosion copper nut, used for preparing the anti-corrosion copper nut according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Take copper, aluminum, chromium, iron, manganese, nickel, silicon and zinc, melt them at 750-900°C, cool them to 200-250°C, keep them warm for 2-4 hours, and obtain an alloy solution; Argon gas is introduced for degassing to obtain a degassed alloy melt; the degassed alloy melt is poured into a mold, cooled, and heat-treated to obtain a copper alloy block; S2, processing the copper alloy block obtained in S1 by lathe and drilling to obtain a nut body (1) with a sealing sleeve (4), a locking cylinder A (71), a locking cylinder B (72) and a connecting rod (10); S3, chamfering the nut body (1) processed in S2, and grinding and polishing it together with the locking cylinder; S3, using a grinding wheel to clean the surfaces of the nut body (1) and the locking cylinder after grinding and polishing through pickling and sandblasting processes; S4, take modified fluorinated graphene, titanium boride-silicon dioxide, and xylene, and ultrasonically disperse for 15-20 minutes to obtain a mixed solution; take epoxy resin and xylene, stir evenly, add the mixed solution, continue stirring for 2-3 hours, add isocyanate curing agent, mix evenly, and let stand for 20-30 minutes to obtain an anti-corrosion and wear-resistant coating; S5, applying the anti-corrosion and wear-resistant coating prepared in S4 to the surface, inner side, locking cylinder and connecting rod (10) of the cleaned nut body (1), and then drying the coating to obtain a nut accessory with an anti-corrosion and wear-resistant coating on the surface; S6. Prepare a sealing ring (813) and a sealing gasket (6) according to the nut accessories prepared in S5; S7, assembling the nut accessory coated with the anti-corrosion and wear-resistant coating in S5 with the prepared sealing ring (813) and sealing gasket (6) to obtain a finished nut.

10. The method for preparing an anti-corrosion copper nut according to claim 9, characterized in that: In step S7, the locking cylinder A (71) and the locking cylinder B (72) are connected and fixed by welding with the connecting rod (10).

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