Underwater corrosion-resistant bolt

Abstract

The utility model discloses a corrosion-resistant bolt used underwater, and relates to the technical field of bolts, the corrosion-resistant bolt comprises a screw, the screw is provided with an external thread, a nut is sleeved on the external thread of the screw, the top of the screw is provided with a ring groove, a sealing ring is arranged in the ring groove, the upper end of the screw is fixedly connected with a head part, and the lower end of the screw is fixedly connected with a nut. A base plate is arranged on the side wall of the end, connected with the screw, of the head. The anode blocks are placed in the extending grooves in the two sides of the assembling groove, the more active metal anode blocks can be corroded preferentially to protect the bolt serving as the cathode, and therefore the service life of the bolt is prolonged, the connecting plate, the spring and the movable plate are arranged in a matched mode, one end of the movable plate abuts against the anode blocks, and along with gradual corrosion and reduction of the anode blocks, the service life of the bolt is prolonged. The movable plate can push the anode block to move towards the outside of the assembly groove, so that the anode block is in full contact with the water body, uniform distribution of current is ensured, and the corrosion resistance of the bolt used underwater is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt technical field especially relates to a corrosion -resistant bolt of underwater use. BACKGROUND

[0002] Bolt as mechanical part specifically refers to the cylindrical threaded fastener with nut, is composed of head and cylindrical body with external thread, needs to cooperate with nut, is used for fastening two parts with through hole.

[0003] In actual application scene, marine engineering, ship, oil platform or underwater pipeline etc. Partial device usually needs to be installed underwater, because the chloride in seawater is very strong to the corrosion of metal material, and is easy to cause stress corrosion cracking, pitting, crevice corrosion etc. Problem of bolt part area, therefore, the bolt for underwater use needs to improve its performance of resisting chemical corrosion in seawater. In view of this, the present application proposes a kind of corrosion -resistant bolt of underwater use. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of corrosion -resistant bolts of underwater use to solve the shortcomings in prior art.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of corrosion -resistant bolt of underwater use, including screw rod, the outer thread is arranged on the screw rod, and the nut is set on the outer thread of the screw rod, the top of the screw rod is equipped with ring groove, and the sealing ring is arranged in the ring groove, the upper end of the screw rod is fixedly connected with head, the side wall of the one end of head and screw rod connection is provided with backing plate;

[0007] The head is equipped with assembly groove, the support mechanism is arranged in the assembly groove, the both ends of the assembly groove are provided with anode block, in the oxidation reaction process, anode block loses electron, electron is conducted to bolt surface by metal, bolt surface is difficult to oxidize, to avoid that bolt is corroded, prolongs the service life of bolt, ensure the stability and reliability of bolt connection structure, guarantee the normal operation of the equipment or structure connected using the bolt.

[0008] As further preferred of the technical scheme, the radial depth R1 of the ring groove is less than the radial depth R2 of the sealing ring, i.e. R1 < R2, because the diameter of the sealing ring is larger, it will extend to the outside of the ring groove, so that when the bolt is connected, with the tightening of the bolt, the sealing ring is extruded, the bottom of the sealing ring is in contact with the surface of the connecting piece, through the elastic deformation of the sealing ring itself, to fill the gap between the connecting piece and the bolt, ensure close contact.

[0009] The plurality of protrusions on the sealing ring are arranged equidistantly, and the protrusions on the sealing ring can be embedded into the grooves of the backing plate when the bolt is assembled, so that a mutual engagement state is formed, and the friction between the bolt head and the connecting piece can be significantly increased.

[0010] As a further preferred aspect of the present technical solution, a plurality of grooves are formed in the lower surface of the backing plate in a circumferential direction, and the width of the grooves is equal to the width of the protrusions.

[0011] As a further preferred aspect of the present technical solution, the assembly groove is a trapezoidal groove, and an extension groove is formed in each side of the trapezoidal groove, and the anode block is arranged in the extension groove, and the width of the extension groove is equal to the width of the anode block.

[0012] As a further preferred aspect of the present technical solution, the support mechanism comprises a connecting plate, a pin shaft is arranged at each end of the connecting plate, and a movable plate is arranged on the pin shaft, and the end of the movable plate away from the connecting plate extends into the extension groove on each side of the assembly groove.

[0013] A spring is arranged at the bottom of the connecting plate, and as the anode block is consumed by corrosion, the contact area between the side wall of the anode block and the inner wall of the extension groove becomes smaller, and the force generated by the contraction of the spring is transmitted to the end of the movable plate, so as to push the anode block to move outward from the head, thereby ensuring that the anode block is in full contact with the water, and the overall corrosion prevention effect of the bolt is good.

[0014] As a further preferred aspect of the present technical solution, a limiting groove is formed in the lower end of the assembly groove, and the spring is arranged in the limiting groove, the bottom of the spring is fixedly connected with the inner wall of the limiting groove, and the top of the spring is fixedly connected with the lower surface of the connecting plate.

[0015] The present application has the following advantages:

[0016] 1. The utility model discloses a more active metal anode block is preferentially corroded to protect the bolt as the cathode, thereby prolonging the service life of the bolt, and the matching setting of the connecting plate, spring and movable plate, one end of the movable plate is abutted with the anode block, along with the gradual corrosion and reduction of the anode block, the movable plate can push the anode block to move out of the assembly groove, thereby making the anode block fully contact with the water body and ensuring the uniform distribution of the current, effectively improving the corrosion resistance of the bolt when used underwater.

[0017] 2. The utility model discloses a sealing ring is set up on the top of the screw rod, and the matching setting of the convex on the sealing ring and the recess on the pad makes the partial area of the sealing ring deform, fills the gap between the bolt and the connecting piece, can be tightly attached to the surface of the bolt head and the component connecting place, and the corrosive medium is infiltrated into the gap, reduces the corrosion to the bolt, and simultaneously relies on the buffer of the sealing ring, can absorb vibration energy, reduces the risk of bolt loosening. DRAWINGS

[0018] Figure 1 A front view structural schematic diagram of the corrosion -resistant bolt of underwater use is provided for the utility model;

[0019] Figure 2 A lower view structural schematic diagram of the corrosion -resistant bolt of underwater use is provided for the utility model;

[0020] Figure 3 The structure schematic diagram of the screw rod and head of the corrosion -resistant bolt of underwater use is provided for the utility model;

[0021] Figure 4 The cross -sectional structure schematic diagram of the head of the corrosion -resistant bolt of underwater use is provided for the utility model.

[0022] In the drawing: 1, screw rod;11, external thread;12, ring groove;13, sealing ring;131, convex;2, head;21, pad;211, recess;22, assembly groove;23, limiting groove;3, support mechanism;31, connecting plate;32, movable plate;33, spring;4, anode block;5, nut. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments.

[0024] The utility model provides technical scheme: such as Figure 1 And Figure 2As shown, a kind of corrosion-resistant bolt used underwater includes screw rod 1, the outer thread 11 is provided on screw rod 1, and nut 5 is sleeved on the outer thread 11 of screw rod 1, the top of screw rod 1 is provided with circle groove 12, and sealing ring 13 is arranged in circle groove 12, the radial depth R1 of circle groove 12 is less than the radial depth R2 of sealing ring 13, i.e. R1 < R2, a plurality of protrusions 131 are circumferentially arranged on the sidewall of sealing ring 13, and the plurality of protrusions 131 are equidistantly arranged, it needs to be explained that sealing ring 13 is arranged in circle groove 12, since the diameter of sealing ring 13 is larger, it can extend to the outside of circle groove 12, so that when the bolt is used for connection, with the tightening of the bolt, sealing ring 13 is extruded, the bottom of sealing ring 13 is in contact with the surface of the connecting piece, and the gap between the connecting piece and the bolt is filled by the elastic deformation of sealing ring 13 itself, to ensure close contact, and a certain buffering effect is achieved, to avoid loosening of the bolt in subsequent use, and the elastic properties of sealing ring 13 itself can absorb and disperse the influence of dynamic load changes, to reduce the direct impact on the bolt.

[0025] In addition, as Figure 3 As shown, the upper end of screw rod 1 is fixedly connected with head 2, gasket 21 is arranged on the sidewall of the connecting end of head 2 with screw rod 1, a plurality of grooves 211 are circumferentially arranged on the lower surface of gasket 21, and the width of groove 211 is equal to the width of protrusion 131, it needs to be explained that the grooves 211 arranged on gasket 21 correspond to the protrusions 131 arranged on sealing ring 13, when the bolt is assembled, the protrusions 131 on sealing ring 13 can be embedded in grooves 211 of gasket 21, to form a kind of interlocking state, which can significantly increase the friction between bolt head 2 and the connecting piece, when the bolt is subjected to axial tension or other external force, this friction can effectively prevent the relative sliding between the bolt and the connecting piece, to ensure the reliability and stability of connection, and in some vibration environment or dynamic load, the increase of friction can also reduce the micro displacement and friction loss between components due to vibration, to prolong the service life of the entire connection structure, and improve its working performance and safety.

[0026] As shown, Figure 4As shown, the head 2 is provided with an assembly groove 22, and the two ends of the assembly groove 22 are respectively provided with an anode block 4. The assembly groove 22 is provided as a trapezoidal groove, and the two sides of the trapezoidal groove are respectively provided with an extension groove in communication. This shape design can maximize the use of space in a limited space, while enhancing the structural stability. The anode block 4 is arranged in the extension groove, and the width of the extension groove is equal to the width of the anode block 4. It should be noted that through precise size matching, the stability of the installation of the anode block 4 is ensured by the friction between the side wall of the anode block 4 and the inner wall of the extension groove. Further, the metal activity of the anode block 4 is higher than that of the bolt material. According to the working principle of the primary battery, the anode undergoes oxidation reaction, that is, the anode block 4 will be continuously corroded and consumed. In the oxidation reaction process, the anode block 4 loses electrons, and the electrons are conducted to the surface of the bolt through the metal. The surface of the bolt is difficult to undergo oxidation reaction, thereby avoiding corrosion of the bolt, prolonging the service life of the bolt, ensuring the stability and reliability of the bolt connection structure, and ensuring the normal operation of the entire equipment or structure connected by the bolt.

[0027] Specifically, the assembly groove 22 is provided with a supporting mechanism 3, the supporting mechanism 3 includes an adapter plate 31, the two ends of the adapter plate 31 are respectively provided with a pin shaft, the pin shaft is provided with a movable plate 32, and the end of the movable plate 32 away from the adapter plate 31 extends into the extension groove on both sides of the assembly groove 22. The bottom of the adapter plate 31 is provided with a spring 33, and the lower end of the assembly groove 22 is provided with a limiting groove 23, and the spring 33 is arranged in the limiting groove 23. The bottom of the spring 33 is fixedly connected with the inner wall of the limiting groove 23, and the top of the spring 33 is fixedly connected with the lower surface of the adapter plate 31. It should be noted that when the anode block 4 is placed in the extension groove on both sides of the assembly groove 22, it will push the movable plate 32 to move, and finally make the adapter plate 31 move upward. At this time, the spring 33 is in a stretched state. With the corrosion and consumption of the anode block 4, the contact area between the side wall of the anode block 4 and the inner wall of the extension groove becomes smaller. When the spring 33 contracts, the force generated by the spring 33 is transmitted to the end of the movable plate 32, which can push the anode block 4 to move outward from the head 2, thereby ensuring that the anode block 4 is in full contact with the water body, and the bolt as a whole has a good corrosion prevention effect. Further, when the anode block 4 is consumed, the spring 33 is retracted into the limiting groove 23, and the adapter plate 31 is in contact with the bottom of the assembly groove 22, and finally the end of the movable plate 32 rotatably arranged on both sides of the adapter plate 31 moves to the outside of the head 2. Therefore, the width between the corresponding side walls of the head 2 is changed. Even if the corners of the bolt head 2 are corroded due to the untimely replacement of the anode block 4, the bolt head 2 can also be twisted by using a wrench or other auxiliary tools.

[0028] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A corrosion resistant bolt for underwater use comprising a shank (1) characterised in that, The screw rod (1) is provided with an external thread (11), and a nut (5) is sleeved on the external thread (11) of the screw rod (1); a ring groove (12) is formed in the top of the screw rod (1), and a sealing ring (13) is arranged in the ring groove (12); a head (2) is fixedly connected to the upper end of the screw rod (1), and a gasket (21) is arranged on the side wall of the end of the head (2) connected with the screw rod (1). An assembly groove (22) is formed in the head (2), and a supporting mechanism (3) is arranged in the assembly groove (22); the two ends of the assembly groove (22) are respectively provided with an anode block (4).

2. A corrosion resistant bolt for underwater use according to claim 1, characterized in that The radial depth R1 of the ring groove (12) is less than the radial depth R2 of the sealing ring (13), that is, R1 < R2. A plurality of protrusions (131) are arranged on the side wall of the sealing ring (13) in the circumferential direction, and the plurality of protrusions (131) are equidistantly arranged.

3. A corrosion resistant bolt for underwater use according to claim 2, characterised in that, A plurality of grooves (211) are formed in the lower surface of the gasket (21) in the circumferential direction, and the width of the grooves (211) is equal to the width of the protrusions (131).

4. A corrosion resistant bolt for underwater use according to claim 1, wherein The assembly groove (22) is a trapezoidal groove, and extension grooves are respectively arranged at the two sides of the trapezoidal groove; the anode block (4) is arranged in the extension grooves, and the width of the extension grooves is equal to the width of the anode block (4).

5. A corrosion resistant bolt for underwater use according to claim 4, characterised in that, The supporting mechanism (3) comprises a connecting plate (31), and pin shafts are respectively mounted at the two ends of the connecting plate (31); movable plates (32) are sleeved on the pin shafts, and the ends of the movable plates (32) away from the connecting plate (31) extend into the extension grooves on the two sides of the assembly groove (22). Springs (33) are mounted at the bottoms of the connecting plates (31).

6. A corrosion resistant bolt for underwater use according to claim 5, wherein Limiting grooves (23) are formed at the lower ends of the assembly grooves (22), and the springs (33) are arranged in the limiting grooves (23); the bottoms of the springs (33) are fixedly connected with the inner walls of the limiting grooves (23), and the tops of the springs (33) are fixedly connected with the lower surfaces of the connecting plates (31).

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