CN217029582U - Anticorrosive fastener - Google Patents

Abstract

The utility model provides an anticorrosive fastener, which belongs to the technical field of fasteners and mainly comprises a bidirectional stud, wherein the bidirectional stud comprises a first stud and a second stud which are integrally formed and coaxially connected with each other, and the screw thread turning directions of the first stud and the second stud are opposite; the bolt sleeve comprises a nut and a cylinder integrally formed with the nut, a threaded blind hole is formed in the axis of the cylinder, one end of a sealing ring is tightly attached to the orifice end of the threaded blind hole in a sealing mode, and the other end of the sealing ring is used for being attached to the joint surface of two workpieces to be connected in a sealing mode; the threaded blind hole is sleeved with one of the threads of the first stud and the second stud, and meanwhile, the surface of the anticorrosive fastener is also provided with a zinc-nickel alloy anticorrosive coating, so that the anticorrosive fastener not only has high fastening reliability, but also has excellent corrosion resistance.

Description

Anti-corrosion fastener

Technical Field

The utility model relates to a fastener for fixedly connecting parts, in particular to an anti-corrosion fastener.

Background

The fastener is a connecting element widely used in industrial production and daily life, is a general term for mechanical parts, is mainly used for connecting or connecting two workpieces or more parts into a whole, and mainly comprises a series of standard parts for fastening and connecting, such as common bolts, keys, pins, rivets and the like. With the rapid development of industrial technologies, it is more and more difficult to apply these common standard connectors to some specific industrial designs, and for the fastening connection of some important components, even becoming a bottleneck technical problem, there is a need to design more fastening elements that can be selected by those skilled in the art, and these fastening elements not only require extremely high connection reliability, but also must have good corrosion resistance, otherwise, the lack of one of them will also cause the mechanical connection failure. However, as the corrosion resistance of fasteners is required to be higher and higher in various industries, ordinary galvanization is far from meeting the requirement.

SUMMERY OF THE UTILITY MODEL

The utility model provides an anticorrosive fastener aiming at the defects in the prior art, and solves the problem that the existing fastener cannot well take corrosion resistance and fastening performance into consideration.

In order to realize the purpose, the utility model adopts the following technical scheme: an anti-corrosion fastener comprises a stud, wherein the stud is a bidirectional stud, the bidirectional stud comprises a first stud and a second stud which are integrally formed and coaxially connected with each other, and the screw thread turning directions of the first stud and the second stud are opposite; the bolt sleeve comprises a nut and a cylinder integrally formed with the nut, a threaded blind hole is formed in the axis of the cylinder, one end of a sealing ring is tightly attached to the orifice end of the threaded blind hole in a sealing mode, and the other end of the sealing ring is used for being attached to the joint surface of two workpieces to be connected in a sealing mode; the threaded blind hole is sleeved with one of the threads of the first stud and the second stud.

Specifically, the cylinder can axially enter a screw hole of one workpiece and is in threaded sleeve connection with the first stud in the screw hole, the second stud is screwed into the other workpiece in a threaded fit manner, and the other end of the sealing ring is in sealing fit with a joint surface of the other workpiece. The design is proper, so that the nut can be tightly attached to the surface of one workpiece.

In addition, the nut is provided with a threaded through hole matched with the thread of the oil seal plug screw, the threaded through hole is communicated with the threaded blind hole, and the threaded blind hole and the thread groove of the bidirectional stud are filled with anti-rust oil. The top end of the bidirectional stud is provided with a hexagonal groove for inserting an inner hexagonal wrench.

Preferably, the nut and one of the two workpieces to be joined are locked against rotation by a pin which is inserted simultaneously into the nut and the workpiece.

A concrete structure of selecting more, this nut is equipped with round forward pawl towards the one end of work piece, and the nut below is equipped with sliding fit ground cover the spline pad on the cylinder, spline pad one end towards the nut be equipped with the reverse pawl of round ability and forward pawl meshing, spline pad elastically installs the surface at the work piece to exert an elasticity of drawing close towards the nut to spline pad all the time, and the tooth of two pawls must make when the two meshes, block the bolt cover and rotate towards not hard up direction.

Furthermore, a disc spring in an axial extrusion state is arranged on the surface of the workpiece, which is opposite to the nut, and the disc spring is sleeved on the outer side of the column body. It is preferred that one lug plate is radially attached to each side of the anti-rotation pad of the present invention.

Furthermore, a pressure-bearing conical spring which is also sleeved outside the column body is coaxially arranged inside the disc spring, the small end of the pressure-bearing conical spring faces upwards and is in extrusion contact with the end face of the rotation stopping pad, and the bottom end of the pressure-bearing conical spring is positioned on the surface of a workpiece.

Finally, the surfaces of the corrosion-resistant fasteners in the utility model are all provided with zinc-nickel alloy coatings, for example, the surfaces of the bidirectional stud and the bolt sleeve can be provided with the zinc-nickel alloy coatings.

Compared with the prior art, the utility model has the following beneficial effects: the utility model integrates two sections of opposite threads on one bidirectional stud, is convenient to process independently, ensures the thread precision, is matched with the bolt sleeve to fasten two workpieces, has better fastening property and self-locking property, has simple and ingenious structure, can seal all the threads which play a role in direct fastening connection, isolates air, water and the like, and ensures the corrosion resistance and the durability of the connection.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a schematic view of a bolt sleeve in a pinned configuration;

FIG. 3 is a schematic view of a portion of the structure of FIG. 1 with a rotation stop pad;

FIG. 4 is an enlarged view taken at I in FIG. 3;

FIG. 5 is a top view of a specific embodiment of the rotation stop pad;

fig. 6 shows a pressing tool for the rotation stop pad.

The device comprises a workpiece 1, another workpiece 2, a bidirectional stud 3, a first stud 301, a second stud 302, a bolt sleeve 4, a cylinder 401, a nut 402, a sealing ring 5, an oil seal plug 6, a forward inverted tooth 7, a reverse inverted tooth 8, a rotation stopping pad 9, a disc spring 10, a pressure-bearing conical spring 11, an ear plate 12, a pin 13, a hydraulic cylinder 14, a cross rod 15 and an inserted rod 16.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the functions of the utility model clearer and easier to understand, the utility model is further explained by combining the drawings and the detailed description:

as a specific anti-corrosion fastener, as shown in FIG. 1, the main structure of the anti-corrosion fastener is that the anti-corrosion fastener comprises a special bidirectional stud 3, and the bidirectional stud 3 is a bidirectional stud which simultaneously has two directions of rotation, namely, a common right-hand thread and an unusual left-hand thread. Specifically, the whole stud 3 comprises a first stud 301 and a second stud 302 which are integrally formed and coaxially connected with each other, the screw threads of the first stud 301 and the second stud 302 are opposite in direction, for example, the first stud 301 may be a left-hand screw thread which is not commonly used, and the second stud 302 may be a right-hand screw thread which is commonly used. Correspondingly, the present embodiment further includes a bolt sleeve 4 for cooperating with one of the studs, specifically, cooperating with the first stud 301 or the second stud 302, and those skilled in the art can select the bolt sleeve according to actual needs. In practice, the bolt housing 4 is constructed in a general bolt-type structure, i.e., specifically includes a nut 402 and a cylinder 401 integrally formed therewith, the outer surface of the cylinder 401 does not have to be threaded, but has a blind threaded hole on the inner axis of the cylinder 401, to cooperate with the corresponding first stud 301 or second stud 302, and one end of a sealing ring 5 is arranged at the orifice end of the threaded blind hole in a sealing and clinging manner, the other end of the sealing ring 5 is used for being in sealing joint with the joint surface of two workpieces to be connected, i.e. the annular sealing ring 5, or gasket, is clamped between the bottom end of the bolt housing 4 and the surface of a workpiece, thereby forming sealing on the joint surface of the two workpieces and preventing external air or moisture from entering the thread of the bidirectional stud 3 through the joint surface so as to protect the thread from being rusted.

In practice, the cylinder 401 of the present embodiment can axially enter the threaded hole of one of the workpieces 1, which is the smooth hole processed in the conventional bolt connection, and with reference to fig. 1, the main body can be a cylindrical structure, and the outer cylindrical surface of the main body is smooth and can be relatively freely inserted into the threaded hole and is in threaded socket connection with the first stud 301 also located in the threaded hole, where, assuming that the first stud 301 is a left-handed thread, the threaded blind hole is correspondingly a left-handed thread, and of course, for the second stud 302, only a right-handed thread can be selected accordingly, so as to be screwed into the other workpiece 2 in a threaded fit manner, or into the lower workpiece as shown in fig. 1. At this time, the other end of the sealing ring 5 of the present embodiment is required to be sealed with the joint surface of the other workpiece 2. When the double-way stud is used specifically, the double-way stud 3 is screwed into a workpiece positioned at the lower part in fig. 1, namely the double-way stud 3 is screwed clockwise, so that the second stud 302 is screwed into the workpiece at the lower part to the limit or a proper position; during manufacturing, in order to facilitate screwing, a hexagonal groove for inserting an inner hexagonal wrench can be formed at the top end of the bidirectional stud 3. Then, when the seal ring 5 is put in, or the seal ring 5 itself is connected to the bolt housing 4 in advance, the bolt housing 4 is directly screwed onto the first stud 301, and the bolt housing 4 is rotated counterclockwise, so that the bolt housing 4 moves downward to the limit or set position, and the seal ring 5 is sufficiently pressed. Of course, the nut 402 is tightly attached to the surface of the upper workpiece, and the degree of extrusion of the sealing ring 5 or the degree of screwing-down of the bolt sleeve 4 is determined by the limit of the surface of the upper workpiece, so that the two workpieces are connected more tightly and reliably.

After the anticorrosion fastener is installed, in the using process, for example, due to a certain working factor of a lower workpiece, the second stud 302 is subjected to a counterclockwise torsion, and the second stud 302 may loosen in the orientation shown in fig. 1, that is, the second stud 302 is subjected to a torsion rotating towards the left side, but at this time, actually, the first stud 301 connected with the second stud 302 is also subjected to the torsion, and because the first stud 301 is a left-handed thread, when the bolt sleeve 4 is fixedly connected with the workpiece, the first stud 301 shows a tendency of being tighter under the counterclockwise torsion, so that the bidirectional stud 3 is less likely to loosen. On the other hand, even if the first stud 301 is not directly fixedly connected with the workpiece, during installation, when the bolt sleeve 4 is screwed to the bottom, not only the workpiece on the upper part is extruded, but also the second stud 302 is axially pulled upwards, so that the second stud 302 is fixedly connected with the workpiece on the lower part, the gap during threaded connection is eliminated to a certain extent, and the two-way stud 3, the bolt sleeve 4, the two workpieces and the four workpieces are organically and firmly combined into a whole.

In the above implementation structure, except that two-way double-screw bolt 3 is sealed between two work pieces, still be equipped with one especially on nut 402 with 6 screw-thread fit's of oil blanket plug screw thread through-hole, this screw-thread through-hole and screw thread blind hole intercommunication, when unscrewing oil blanket plug screw 6, pour into anti-rust oil into towards the screw thread blind hole, thereby make the inside of screw thread blind hole and two-way double-screw bolt 3's screw thread slot isotructure all filled with anti-rust oil, to the core structure-screw thread pair that is used for work piece lug connection fixed, the oil blanket that carries out anti-rust oil is anticorrosive, it is better than aforementioned isolated air's sealed anticorrosive effect, and still be convenient for use after for a long time, dismantle out two-way double-screw bolt 3 fast, this point, it can't realize to have fastener or the fastening structure of many threaded connection now.

Finally, in the present embodiment, there are various ways for the aforementioned fixing between the bolt housing 4 and the workpiece, for example, as shown in fig. 2, in which the nut 402 and one of the two workpieces to be connected are locked and locked by the pin 13, the pin 13 is inserted into the nut 402 and the workpiece at the same time, so that the nut 402 cannot easily rotate, and then is combined with the thread of the first stud 301, so as to achieve the firm connection between the bolt housing 4 and the corresponding workpiece, and because the direct connection structure between the two workpieces is a special thread pair structure that is matched with each other by left-hand rotation and right-hand rotation, a limited fixing and rotation-stopping constraint force is applied to the bolt housing 4, so as to achieve the fixing easily and reliably.

Of course, in addition to the above-mentioned fixed rotation-stopping manner of the pin 13 connection, the present embodiment also introduces a special rotation-stopping and fixing structure, specifically, as shown in fig. 3-5, that is, the nut 402 is provided with a circle of forward-direction inverted teeth 7 towards one end of the workpiece, the nut 402 is provided with a rotation-stopping pad 9 which is sleeved on the column 401 in a sliding fit manner, the rotation-stopping pad 9 is provided with a circle of reverse-direction inverted teeth 8 which can be engaged with the forward-direction inverted teeth 7 towards one end of the nut 402, the rotation-stopping pad 9 is elastically installed on the surface of the workpiece and always applies an elastic force to the rotation-stopping pad 9 which is close to the nut 402, and the teeth directions of the two inverted teeth are required to prevent the bolt sleeve 4 from rotating in the loosening direction when the two are engaged, and as for the inverted teeth shape, the technician can design adaptively as long as the above-mentioned rotation-stopping function can be realized. More specifically, the surface of the workpiece facing the nut 402 is provided with the disc spring 10 in an axially compressed state, and the disc spring 10 is sleeved outside the cylinder 401, so that the rotation stopping pad 9 is elastically pre-tensioned and installed. A pressure-bearing conical spring 11 which is also sleeved outside the column body 401 can be coaxially arranged inside the disc spring 10, the small end of the pressure-bearing conical spring 11 faces upwards and is in pressing contact with the end face of the rotation stopping pad 9, and the bottom end of the pressure-bearing conical spring is positioned on the surface of a workpiece. In addition, for the convenience of installation, two sides of the rotation stopping pad 9 are respectively and radially connected with an ear plate 12, the ear plates 12 can be provided with a jack, when the bolt sleeve 4 is screwed in, the ear plates 12 can be firstly pressed to enable the disc spring 10 or/and the pressure-bearing conical spring 11 to be pressed to a required degree, then the bolt sleeve 4 is conveniently screwed, then the ear plates 12 are released to enable the inverted teeth of the rotation stopping pad 9 connected with the disc spring 10 or the pressure-bearing conical spring 11 to be meshed with the inverted teeth of the nut 402, of course, during actual use, the elastic stiffness coefficient of the disc spring 10 or the pressure-bearing conical spring 11 is enough to form enough ejecting elastic force on the nut 402 to ensure stable and reliable engagement of the inverted teeth, therefore, during actual manufacture, circular slots can be arranged on the ear plates 12, a cross rod 15 is fixed on a hydraulic cylinder 14 as shown in fig. 6, two ends of the cross rod 15 are respectively provided with an inserted rod 16, the insertion rod 16 is pushed into the circular slot by hydraulic pressure, so that the disc spring 10 or the pressure-bearing conical spring 11 is sufficiently compressed to install the bolt sleeve 4.

In the above structural design, the specific inclination of the tooth direction for the forward-direction inverted tooth 7 and the reverse-direction inverted tooth 8 can be as shown in fig. 4-5, at this time, the threaded blind holes of the first stud 301 and the bolt sleeve 4 should be left-handed threads, and when the blind holes are in a loose state due to the clockwise rotation of an external factor, as can be seen from fig. 4, the two inverted teeth cannot be easily rotated due to the meshing relationship of the two inverted teeth, and the bolt sleeve 4 is tightened due to the counterclockwise rotation, and since the tooth point of the reverse-direction inverted tooth 8 is toward the left side, the inverted tooth at the bottom end of the nut 402 on the bolt sleeve 4 can slide along the inclined surface of the inverted tooth on the workpiece relative to the clockwise rotation, or, the rotation-stopping pad 9 is slightly pressed down, so that the bolt sleeve 4 can be rotated counterclockwise to be tightened. The rotation stopping structure of the bolt sleeve 4 of the embodiment has the function of a spring washer in the existing fastening connection on one hand, and on the other hand, can mainly aim at the fastening connection between the related parts on the equipment, and the parts cannot be considered from the perspective of general fastening connection design because the core function of the whole equipment is effective, and the fastening reliability and the corrosion resistance are required to be taken as the absolute design, manufacture and installation principles.

As a best mode, the surface of the fastener of the utility model is also provided with a zinc-nickel alloy anti-corrosion coating, for example, the zinc-nickel alloy anti-corrosion coating is arranged on the surface of a screw joint pair, specifically, the surface of the screw joint pair such as the bidirectional stud 3 and the bolt sleeve 4, so that the zinc-nickel alloy anti-corrosion coating has excellent corrosion resistance, the corrosion resistance of the anti-corrosion fastener can reach more than 10 times of that of a common galvanized bolt at the same thickness, and the zinc-nickel alloy coating is an anode coating on a steel substrate, thereby providing effective cathode protection. Moreover, the zinc-nickel alloy plating layer has enough binding force with the matrix, which can ensure that the plating layer can exert extremely high corrosion resistance; meanwhile, the high-performance zinc-plated bolt has excellent thermal fatigue resistance and low hydrogen brittleness, after chilling and heat-shock treatment at the temperature of-60-250 ℃, the corrosion resistance of the high-performance zinc-plated bolt is unchanged, the hydrogen brittleness rate is only 1.5%, the embrittlement rate of the conventional zinc-plated bolt is generally over 40%, and the cadmium-plated bolt is about 18%. In addition, the corrosion-resistant fastener has the processability equivalent to that of the conventional galvanized bolt, and has corrosion resistance superior to that of the conventional galvanized bolt even after deformation processing; and because the hardness of the zinc-nickel alloy coating is higher than that of the conventional galvanized bolt coating, the zinc-nickel alloy coating also has better wear resistance, and can be widely applied to the industries of electrolytic aluminum, ferrous metallurgy, thermal power generation, ships, offshore wind power, drilling platforms, 5G base stations, power grid iron towers, oil and gas pipelines, petrochemical engineering and the like.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (10)

1. An anticorrosive fastener, includes the double-screw bolt, its characterized in that: the stud is a bidirectional stud (3), the bidirectional stud (3) comprises a first stud (301) and a second stud (302) which are integrally formed and coaxially connected with each other, and the screw thread directions of the first stud (301) and the second stud (302) are opposite;

the bolt sleeve (4) comprises a nut (402) and a cylinder (401) which is integrally formed with the nut, a threaded blind hole is formed in the axis of the cylinder (401), one end of a sealing ring (5) is tightly attached to the end of an orifice of the threaded blind hole, and the other end of the sealing ring (5) is used for being attached to the joint surfaces of two workpieces to be connected; the threaded blind hole is sleeved with one of the first stud (301) and the second stud (302) in a threaded mode.

2. The corrosion resistant fastener of claim 1 wherein: the cylinder (401) can axially enter a screw hole of one workpiece (1) and is in threaded sleeve connection with the first stud (301) which is also located in the screw hole, the second stud (302) is screwed into the other workpiece (2) in a threaded fit mode, and the other end of the sealing ring (5) is in sealing fit with a joint surface of the other workpiece (2).

3. The corrosion resistant fastener of claim 2 wherein: the nut (402) is tightly attached to the surface of one workpiece (1).

4. The corrosion resistant fastener of claim 1 wherein: the nut (402) is provided with a threaded through hole in threaded fit with the oil seal plug screw (6), the threaded through hole is communicated with the threaded blind hole, and rust-proof oil is filled in the threaded blind hole and the thread groove of the bidirectional stud (3).

5. The corrosion resistant fastener of claim 1 wherein: the top end of the bidirectional stud (3) is provided with a hexagonal groove for inserting an inner hexagonal wrench.

6. The corrosion resistant fastener of claim 1 wherein: the screw cap (402) is locked in rotation with one of the two workpieces to be joined by means of a pin (13), the pin (13) being inserted simultaneously into the screw cap (402) and the workpieces.

7. The corrosion resistant fastener of claim 1 wherein: nut (402) are equipped with round forward pawl (7) towards the one end of work piece, and nut (402) below is equipped with sliding fit ground cover only commentaries on classics pad (9) on cylinder (401), only commentaries on classics pad (9) are equipped with reverse pawl (8) that the round can mesh with forward pawl (7) towards the one end of nut (402), only change pad (9) and install the surface at the work piece elastically to apply one towards nut (402) elasticity of drawing close all the time to only changing pad (9), and the tooth of two pawls must make the two when meshing, block bolt cover (4) and rotate towards not hard up direction.

8. The corrosion resistant fastener of claim 7 wherein: a disc spring (10) in an axial extrusion state is arranged on the surface of the workpiece, which is opposite to the nut (402), and the disc spring (10) is sleeved on the outer side of the cylinder (401); two sides of the rotation stopping pad (9) are respectively and radially connected with an ear plate (12).

9. The corrosion resistant fastener of claim 8 wherein: the disc spring (10) is internally coaxially provided with a pressure-bearing conical spring (11) which is also sleeved outside the cylinder (401), the small end of the pressure-bearing conical spring (11) faces upwards and is in extrusion contact with the end face of the rotation stopping pad (9), and the bottom end of the pressure-bearing conical spring is positioned on the surface of a workpiece.

10. The corrosion resistant fastener of claim 1 wherein: the surfaces of the bidirectional stud (3) and the stud sleeve (4) are provided with zinc-nickel alloy coatings.

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