Bolt with anti-corrosion function

Abstract

The invention relates to the technical field of bolts, in particular to a bolt with an anti-corrosion function, which comprises a bolt body consisting of a bolt head and a screw rod, a nut with a cap in threaded matching connection with the screw rod, and two sealing gaskets movably sleeved on the screw rod, the two sealing gaskets are attached to the opposite sides of the bolt head and the nut with the cap respectively, a first annular cavity and a second annular cavity are formed in the sealing gaskets around center holes of the sealing gaskets, the first annular cavity and the second annular cavity are communicated through a first communicating hole, and the first annular cavity and the second annular cavity are filled with sealing oil. A first circular seam and a second circular seam are formed in the two opposite sides of the sealing gasket around a center hole of the sealing gasket, the first circular seam is communicated with the first ring cavity, and the second circular seam is communicated with the second ring cavity; an oil supplementing hole communicating with the first annular cavity is formed in the surface of the sealing gasket. The screw rod can be protected from being corroded by external air or liquid in the using process, and the screw rod is prevented from being corroded in the using process due to damage of a surface anti-corrosion layer.

Description

Technical Field

[0001] The invention relates to the technical field of bolts, and in particular to a bolt with an anti-corrosion function. Background Art

[0002] In many industrial fields, such as construction, machinery manufacturing, marine engineering, chemical equipment, etc., bolts are widely used as key connectors, shouldering the important task of fastening parts and ensuring the integrity and stability of the structure. However, traditional bolts have poor corrosion resistance in complex and harsh operating environments, resulting in a series of thorny problems, which seriously restrict industrial production and facility safety.

[0003] At present, the anti-corrosion measures for bolts mainly include: 1. Surface coating treatment: galvanizing, cadmium plating, chrome plating, spray anti-corrosion coating. 2. Chemical conversion film treatment: passivation treatment, phosphating treatment. 3. Surface modification treatment. 4. Shot peening. 5. Carburizing and quenching. 6. Coating with anti-corrosion agent. 7. Various treatment methods such as nut sleeve. These treatment methods have their own advantages in different application scenarios. Due to the need to ensure the strength of the bolt itself, these treatment methods are almost all surface treatments, and a protective layer is formed between the bolt body and the external environment to prevent external corrosion. For scenarios where the bolt does not need to be frequently disassembled after installation, this treatment method will not cause the surface protective layer to be worn by repeated twisting, and its anti-corrosion effect can last for a long time. However, for some use scenarios that require frequent disassembly, frequent disassembly and installation will cause the surface of the bolt to be partially damaged under the friction of the thread, resulting in the loss of the protective layer. Under the influence of the surrounding environment, it will quickly rust or be corroded by the liquid or gas in the location. Summary of the invention

[0004] The purpose of the present invention is to provide a bolt with anti-corrosion function, so as to solve the problem that in the prior art, most bolts are protected against corrosion by a surface anti-corrosion layer. In some usage scenarios where frequent disassembly is required, frequent disassembly and installation will cause the surface of the bolt to be partially damaged due to the friction of the thread, thereby causing the protective layer to lose its function and causing the bolt to suffer from corrosion.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A bolt with anti-corrosion function comprises a bolt body consisting of a bolt head and a screw rod, and a cap nut matched with the screw rod thread, and also comprises two sealing gaskets movably sleeved on the screw rod, the two sealing gaskets are respectively attached to the opposite sides of the bolt head and the cap nut, a first annular cavity and a second annular cavity are arranged around the center hole of the sealing gasket itself, the first annular cavity and the second annular cavity are connected through a first connecting hole, and the first annular cavity and the second annular cavity are filled with sealing oil; a first annular gap and a second annular gap are arranged around the center hole of the sealing gasket itself on opposite sides, the first annular gap is connected to the first annular cavity, and the second annular gap is connected to the second annular cavity; an oil filling hole connected to the first annular cavity is arranged on the surface of the sealing gasket.

[0006] A further technical solution is that an oil supply pipe connected to the oil supply hole is installed in the oil supply hole, a piston is slidably arranged in the oil supply pipe, the outer wall of the piston and the inner wall of the oil supply pipe are slidingly and sealingly fitted, the end of the oil supply pipe away from the oil supply hole is sealed by a first sealing plate, the first sealing plate is provided with mounting holes running through both sides, a push rod is slidably installed in the mounting hole, one end of the push rod is placed in the oil supply pipe and is connected to a push plate, the push plate is top-contacted with the piston, the outer wall of the push rod is sleeved with a spring in the oil supply pipe, one end of the spring is top-contacted with the first sealing plate, and the other end is top-contacted with the push plate.

[0007] A further technical solution is that the push rod is provided with a first external thread at a position close to the push plate, and the inner wall of the mounting hole is provided with a first internal thread matching the first external thread.

[0008] A further technical solution is that the sealing gasket is provided with sealing rings on both the inner and outer sides of the first annular gap and the second annular gap.

[0009] A further technical solution is that the oil supply hole is connected to the first annular cavity through the second connecting hole.

[0010] A further technical solution is that a limiting ring is protruding from the wall of the oil supply hole, and the second connecting hole is connected to the wall of the oil supply hole between the limiting ring and the bottom of the oil supply hole; the outer wall of the oil supply pipe is provided with a second external thread, and the wall of the oil supply hole is provided with a second internal thread matching the second external thread.

[0011] A further technical solution is that one end of the oil replenishing pipe placed in the oil replenishing hole is sealed by a second sealing plate, and an oil outlet hole penetrating through both sides is provided in the middle of the second sealing plate.

[0012] A further technical solution is that scale lines are arranged on the outer wall of the push rod.

[0013] Compared with the prior art, the present invention has at least one of the following beneficial effects: 1. When sealing the bolt, a sealing gasket is put on the screw rod to fit the position of the bolt head, and then passed through the position to be fixed, and another sealing gasket and a cap nut are installed on the screw rod in sequence, and the cap nut is tightened to complete the fixing of the bolt. With the help of the first annular gap and the second annular gap on both sides of the sealing gasket, sealing oil can overflow to seal the two sides of the sealing gasket, thereby blocking the external air or other liquids from entering the position of the screw rod and causing corrosion to the screw rod; 2. With the help of the oil replenishing hole, the sealing oil can be replenished into the first annular cavity and the second annular cavity through the oil replenishing hole at any time, so that the sealing oil overflows from the first annular gap and the second annular gap to seal; 3. The use of the cap nut can well protect the exposed part of the screw rod; 4. Since the sealing oil can be used to seal the screw rod and the external environment after each bolt is installed, the screw rod can be protected from being corroded by external air or liquid during use, and will not be corroded during use due to damage to the surface anti-corrosion layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is an overall schematic diagram of a bolt with anti-corrosion function according to the present invention.

[0015] Figure 2 This is a schematic cross-sectional view of a bolt with anti-corrosion function after installation according to the present invention.

[0016] Figure 3 for Figure 2 A partial enlarged schematic diagram of the area marked A in the middle.

[0017] Icons: 1-bolt head, 2-screw, 3-nut with cap, 4-sealing gasket, 5-first annular cavity, 6-second annular cavity, 7-first connecting hole, 8-first annular gap, 9-second annular gap, 10-oil supply hole, 11-oil supply pipe, 12-piston, 13-first sealing plate, 14-mounting hole, 15-push rod, 16-push plate, 17-spring, 18-second connecting hole, 19-limiting ring, 20-second sealing plate, 21-oil outlet hole. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] Figures 1 to 3 An embodiment of the present invention is shown.

[0020] Example: A bolt with anti-corrosion function, comprising a bolt body consisting of a bolt head 1 and a screw rod 2, and a cap nut 3 connected to the screw rod 2 by thread matching, and also comprising two sealing gaskets 4 movably sleeved on the screw rod 2, the two sealing gaskets 4 are respectively attached to the bolt head 1 and the opposite sides of the cap nut 3, a first annular cavity 5 and a second annular cavity 6 are arranged around the center hole of the sealing gasket 4, the first annular cavity 5 and the second annular cavity 6 are connected through a first connecting hole 7, and the first annular cavity 5 and the second annular cavity 6 are filled with sealing oil; a first annular gap 8 and a second annular gap 9 are arranged around the center hole of the sealing gasket 4 on opposite sides, the first annular gap 8 is connected to the first annular cavity 5, and the second annular gap 9 is connected to the second annular cavity 6; an oil filling hole 10 connected to the first annular cavity 5 is arranged on the surface of the sealing gasket 4. When the bolt is sealed, a sealing gasket 4 is put on the screw rod 2 to fit the position of the bolt head 1, and then passed through the position to be fixed, and another sealing gasket 4 and a cap nut 3 are installed on the screw rod 2 in sequence, and the cap nut 3 is tightened to complete the fixing of the bolt. With the help of the first annular gap 8 and the second annular gap 9 on both sides of the sealing gasket 4, the sealing oil can overflow to seal the two sides of the sealing gasket 4, thereby blocking the external air or other liquids from entering the position of the screw rod 2 and corroding the screw rod 2. With the help of the oil replenishing hole 10, the sealing oil can be replenished into the first annular cavity 5 and the second annular cavity 6 at any time through the oil replenishing hole 10, so that the sealing oil overflows from the first annular gap 8 and the second annular gap 9 for sealing; 3. The use of the cap nut 3 can well protect the exposed part of the screw rod 2.

[0021] An oil replenishing pipe 11 connected to the oil replenishing hole 10 is installed in the oil replenishing hole 10, and a piston 12 is slidably arranged in the oil replenishing pipe 11. The outer wall of the piston 12 and the inner wall of the oil replenishing pipe 11 are slidingly sealed and fitted. The end of the oil replenishing pipe 11 away from the oil replenishing hole 10 is sealed by a first sealing plate 13. The first sealing plate 13 is provided with a mounting hole 14 that runs through both sides. A push rod 15 is slidably installed up and down in the mounting hole 14. One end of the push rod 15 is placed in the oil replenishing pipe 11 and is connected to a push plate 16. The push plate 16 is connected to the piston 12 by top contact. The outer wall of the push rod 15 is sleeved with a spring 17 in the oil replenishing pipe 11, and one end of the spring 17 is connected to the first sealing plate 13 by top contact, and the other end is connected to the push plate 16 by top contact. With such arrangement, after the bolts are installed, taking one of the sealing gaskets 4 as an example, one side of the sealing gasket 4 fits with the bolt head 1, and the other side fits with the surface of the connection position, so that the first annular gap 8 fits with the bolt head 1, and the second annular gap 9 fits with the surface of the connection position. In the case of tight fit, the first annular gap 8 will be sealed by the bolt head 1, and similarly, the second annular gap 9 will be sealed by the surface of the connection position. The spring 17 will push the push plate 16 to generate thrust on the piston 12, so that the piston 12 will generate thrust on the sealing oil in the oil replenishment pipe 11, and the pressurized sealing oil will move toward the first annular gap 8 and the second annular gap 9, and overflow to the gaps of the first annular gap 8 and the second annular gap 9 to fill the gaps between the sealing gasket 4 and the bolt head 1 and the sealing gasket 4 and the surface of the connection position, so as to prevent external gas or liquid from entering the position of the screw 2. If there is no joint gap on both sides of the sealing gasket 4, the sealing oil will not penetrate into the outside or inside of the sealing gasket 4. If there is a joint gap on both sides of the sealing gasket 4, the sealing oil will gradually penetrate out. During the process of the sealing oil penetrating out, the spring 17 will push the push plate 16 to move toward the bottom of the oil replenishing hole 10 and drive the push rod 15 to enter the oil replenishing pipe 11. The operator can judge whether there is oil leakage according to the position change of the push rod 15 in the oil replenishing pipe 11 during use.

[0022] The push rod 15 is provided with a first external thread at a position close to the push plate 16, and the inner wall of the mounting hole 14 is provided with a first internal thread matching the first external thread. Before using the oil supply pipe 11, the push rod 15 can be pulled outward to extract the sealing oil with the help of the piston 12. After the extraction is completed, the push rod 15 is fixed by connecting the first external thread and the first internal thread to prevent the push rod 15 from directly pushing out the sealing oil under the drive of the spring 17 after the push rod 15 is loosened. After installing the oil supply pipe 11 to the oil supply hole 10, before completely tightening the bolts, screw the push rod 15 to separate the first thread of the push rod 15 from the second thread, and push the sealing oil into the first annular gap 8 and the second annular gap 9. In this way, both sides of the sealing gasket 4 can be filled, and then the bolts can be tightened to make the two sides of the sealing gasket 4 seal and fit.

[0023] The sealing gasket 4 is provided with sealing rings on both the inner and outer sides of the first annular gap 8 and the second annular gap 9. By providing the sealing rings to cooperate with the sealing oil, the two sides of the sealing gasket 4 can be better sealed. And whether the sealing ring is tightly sealed can be judged according to whether the push rod 15 is displaced during use.

[0024] The oil replenishing hole 10 is connected to the first annular cavity 5 through the second communicating hole 18 .

[0025] A limit ring 19 is protruding from the wall of the oil replenishing hole 10, and the second connecting hole 18 is connected to the wall of the oil replenishing hole 10 between the limit ring 19 and the bottom of the oil replenishing hole 10; the outer wall of the oil replenishing pipe 11 is provided with a second external thread, and the wall of the oil replenishing hole 10 is provided with a second internal thread matching the second external thread. By providing the limit ring 19, it is possible to prevent the oil replenishing pipe 11 from directly contacting the bottom of the oil replenishing hole 10, leaving enough space for oil outlet. By providing the second external thread and the second internal thread, the oil replenishing pipe 11 and the oil replenishing hole 10 can be conveniently connected. And if it is found during use that the sealing oil in the oil replenishing pipe 11 has flowed out, the oil replenishing pipe 11 can be disassembled at any time, and then installed after the sealing oil is replenished.

[0026] A limit ring 19 is protruding from the wall of the oil replenishing hole 10, and the second connecting hole 18 is connected to the wall of the oil replenishing hole 10 between the limit ring 19 and the bottom of the oil replenishing hole 10; the outer wall of the oil replenishing pipe 11 is provided with a second external thread, and the wall of the oil replenishing hole 10 is provided with a second internal thread matching the second external thread. By providing the limit ring 19, it is possible to prevent the oil replenishing pipe 11 from directly contacting the bottom of the oil replenishing hole 10, leaving enough space for oil outlet. By providing the second external thread and the second internal thread, the oil replenishing pipe 11 and the oil replenishing hole 10 can be conveniently connected. And if it is found during use that the sealing oil in the oil replenishing pipe 11 has flowed out, the oil replenishing pipe 11 can be disassembled at any time, and then installed after the sealing oil is replenished.

[0027] Scale lines are arranged on the outer wall of the push rod 15. By arranging the scale lines, it is possible to better judge whether the push rod 15 has been displaced during use.

[0028] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A bolt with anti-corrosion function, comprising a bolt body consisting of a bolt head (1) and a screw rod (2), and a cap nut (3) threadably connected to the screw rod (2), characterized in that: The invention also comprises two sealing gaskets (4) movably sleeved on the screw rod (2), the two sealing gaskets (4) being respectively attached to opposite sides of the bolt head (1) and the cap nut (3), the sealing gasket (4) being provided with a first annular cavity (5) and a second annular cavity (6) around its own central hole, the first annular cavity (5) and the second annular cavity (6) being connected via a first connecting hole (7), the first annular cavity (5) and the second annular cavity (6) being filled with sealing oil; the sealing gasket (4) being provided with a first annular gap (8) and a second annular gap (9) around its own central hole on opposite sides, the first annular gap (8) being connected to the first annular cavity (5), the second annular gap (9) being connected to the second annular cavity (6); and the surface of the sealing gasket (4) being provided with an oil filling hole (10) connected to the first annular cavity (5).

2. The bolt with anti-corrosion function according to claim 1, characterized in that: An oil replenishing pipe (11) connected to the oil replenishing hole (10) is installed in the oil replenishing hole (10), a piston (12) is slidably arranged in the oil replenishing pipe (11), the outer wall of the piston (12) and the inner wall of the oil replenishing pipe (11) are slidingly sealed, one end of the oil replenishing pipe (11) away from the oil replenishing hole (10) is sealed by a first sealing plate (13), the first sealing plate (13) is provided with a mounting hole (14) passing through both sides, a push rod (15) is slidably installed in the mounting hole (14) up and down, one end of the push rod (15) is placed in the oil replenishing pipe (11) and is connected to a push plate (16), the push plate (16) is connected to the piston (12) by top contact, the outer wall of the push rod (15) is sleeved with a spring (17) in the oil replenishing pipe (11), one end of the spring (17) is connected to the first sealing plate (13) by top contact, and the other end is connected to the push plate (16) by top contact.

3. The bolt with anti-corrosion function according to claim 2, characterized in that: The push rod (15) is provided with a first external thread at a position close to the push plate (16), and the inner wall of the mounting hole (14) is provided with a first internal thread that matches the first external thread.

4. The bolt with anti-corrosion function according to claim 2, characterized in that: The sealing gasket (4) is provided with sealing rings on both the inner and outer sides of the first annular gap (8) and the second annular gap (9).

5. The bolt with anti-corrosion function according to claim 2, characterized in that: The oil replenishing hole (10) is connected to the first annular cavity (5) via a second connecting hole (18).

6. The bolt with anti-corrosion function according to claim 5, characterized in that: A limit ring (19) is protruding from the hole wall of the oil supply hole (10), and the second connecting hole (18) is connected to the hole wall of the oil supply hole (10) between the limit ring (19) and the hole bottom of the oil supply hole (10); the outer wall of the oil supply pipe (11) is provided with a second external thread, and the hole wall of the oil supply hole (10) is provided with a second internal thread matching the second external thread.

7. The bolt with anti-corrosion function according to claim 2, characterized in that: One end of the oil replenishing pipe (11) placed in the oil replenishing hole (10) is sealed by a second sealing plate (20), and an oil outlet hole (21) penetrating through both sides is provided in the middle of the second sealing plate (20).

8. The bolt with anti-corrosion function according to claim 2, characterized in that: The outer wall of the push rod (15) is provided with scale lines.

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