CN219299748U - Metal gasket, anti-loosening structure thereof and anti-loosening screw pair thereof - Google Patents

Abstract

The utility model discloses a metal gasket, an anti-loosening structure thereof and an anti-loosening screw pair thereof. The metal gasket is round in periphery, and is provided with a coaxial round hole (37) in the middle, and is characterized in that: the metal gasket is a thicker metal gasket (1), one end face is an inclined plane (32), and the height of the thick side is 1/10-1 times of the tooth distance of the sleeved bolt (4) than that of the thin side. Anti-loosening structure (11), its characterized in that: a coaxial thick metal washer (1) is clamped between the main nut (2) and the auxiliary nut (3), and is oppositely screwed on the screw rod (5). The anti-loosening screw pair (13) is characterized in that: the fixed end (10) of the bolt (4) is a locking structure (11), and the thicker metal washer (1) leads the surface of the internal thread (6) of the auxiliary nut (3) and the surface of the external thread (7) of the bolt (4) to fall inclined, lock and be locked. Overcomes the defects that the screw (5) in the prior art is easy to bend and can not be reused, and is used for fastening and loosening prevention of vibration mechanical equipment and facilities.

Description

Metal gasket, anti-loosening structure thereof and anti-loosening screw pair thereof

The application is a divisional application with the original application number 202221469666.8, the application date of the original application is 2022, 05 and 28, and the utility model of the original application is named as a metal gasket, a locking structure and a locking screw pair thereof.

Technical Field

The utility model relates to the field of anti-loosening fasteners, in particular to a metal gasket, an anti-loosening structure thereof and an anti-loosening screw pair thereof.

Background

The existing metal washers refer to the parts that are placed between the piece to be connected and the nut. The flat metal rings are used for protecting the surfaces of the connected pieces from being scratched by nuts, and dispersing the pressure of the nuts on the connected pieces, such as the national standard GB/T3103.3-2000, wherein two ends of the metal washers are parallel to each other, and the upper and lower thicknesses of the flat metal rings are the same and do not play a role in preventing looseness.

The existing double-nut friction is loose-proof, two nuts with the same rotation direction are oppositely propped against the outer wire of the same bolt, and are oppositely screwed down, so that a propping force is generated between the two nuts, friction is generated between the lower main nut and the spring pad, friction is generated between the lower main nut and the upper auxiliary nut, the double friction achieves the effect of pre-tightening, and after severe vibration, the parallel thread double-nut loose-proof structure still can quickly loose.

To this end, prior art CN204493402U provides a locknut structure comprising a flat nut and a beveled nut. One end face of the inclined nut is an inclined face, an included angle is formed between the inclined face and a vertical line of a screw hole axis of the inclined nut, the flat nut and the inclined nut are sequentially arranged on the bolt, and the matched contact faces of the two nuts comprise the inclined face and are sequentially screwed. The inclined plane is not perpendicular to the axis of the bolt, and the upper part generates a certain bending moment on the bolt, and the bending moment enhances the anti-loosening effect. This solution has the following drawbacks: 1. because the main nut and the auxiliary nut are flat nuts and oblique nuts, after the main nut and the auxiliary nut are pre-tightened on the same bolt, the contacted plane and the inclined plane are in full contact, so that the phenomenon that the screw rod of the bolt bends to one side at the full contact surface can be avoided; 2. because the bolt is bent, the bolt can only be used once and can not be reused; 3. because the bolt is deformed and bent by tightening the screw threads between the two nuts, the nut with the downward bending position cannot be disassembled, and the nut can be used once; 4. the inclined surface of the inclined surface nut is processed by a die or a cutting means, so that the inclined surface nut is complex in processing and wastes materials, and the cost is high; 5. the yield strength and the tensile strength of the bolt are greatly reduced due to the bending of the screw rod of the bolt, and the bolt can be subjected to yield fracture from the bending part of the screw rod when in severe vibration; 6. because the respective shafts of the flat nut and the inclined nut are coaxial with the bolt shaft of the section pre-tightened by the flat nut and the inclined nut respectively, namely, each thread tooth of the flat nut and each thread tooth of the inclined nut are parallel to the thread tooth surface of the screwed bolt of the section respectively, one surface of each thread tooth is contacted and stretched, the axis of the nut and the axis of the bolt are coaxial, and when the nut vibrates and is free to move, the nut easily vibrates, moves back and loosens on the outer wire of the screw without friction force.

Disclosure of Invention

In order to overcome the defects in the prior art, the scheme aims to provide a metal gasket, a locking structure and a locking screw pair, wherein the locking is reliable, low in cost and capable of being repeatedly used.

The utility model provides a metal washer, is circular including the periphery, and the centre is coaxial round hole, the flat metal ring of constitution, its characterized in that:

the metal gasket is a thicker metal gasket, and the upper end face and the lower end face of the metal gasket are not parallel or are thicker in inclined plane; or is at least one end of which is provided with a convex point and is thicker;

the upper end face and the lower end face of the metal ring of the inclined plane thicker metal gasket form an included angle alpha, and the alpha is more than 0 degrees and less than 30 degrees;

the included angle alpha formed by the upper end face and the lower end face refers to the acute angle pair of four dihedral angles formed by the upper end plane and the lower end plane, and the geometrical father Euclidean angle is defined as the relative inclination of two non-parallel straight lines in the plane;

one of the calculation methods for forming an included angle alpha between the upper end face and the lower end face is as follows: firstly, finding the intersection line of the upper end face and the lower end face, and respectively making a perpendicular line of the intersection line in the two faces, wherein the included angle of the two lines is the included angle alpha of the upper end face and the lower end face; the second method is as follows: the two planes do not intersect, the two planes are first elongated until intersecting, and then the steps of the first method are repeated;

the plane angle is a plane angle alpha of a dihedral angle, wherein any point on the dihedral angle is taken as an end point, two rays perpendicular to the dihedral angle are respectively made in two planes, and the angle formed by the two rays is called the dihedral angle; or rays perpendicular to the edges are taken in two half planes from any point on the dihedral edge, respectively, the angle made by these two rays is called the dihedral plane angle α.

The inclined plane is thicker than the metal gasket, and the metal gasket is formed by stamping through a die.

The thick metal gasket with the point comprises a flat metal ring, wherein the periphery of the metal ring is circular, the middle of the metal ring is a coaxial round hole, the two end faces of the metal ring are mutually parallel, and the metal flat gasket body is formed, and the thick metal gasket is characterized in that:

one end plane of the metal ring is respectively contacted with the circular ring plane of the main nut or the auxiliary nut, and any position on the other end plane of the metal ring is provided with a convex point;

the protruding points and the metal flat gasket body are fixed into a whole.

Further, the height of the salient points is at least 1/10-1 times of the external thread pitch of the screw sleeved by the inner ring of the metal gasket; the radial length of the bottom area of the salient point is not less than 1/3 times of the external thread pitch of the sleeved screw.

Further, the cross section of the bump perpendicular to the height thereof is of any shape.

Further, the cross section of the convex point perpendicular to the height of the convex point is round, or elliptical, or rectangular, or trapezoid, or triangle, or prism.

Further, the convex points are fixedly connected with the circular ring plane at one end of the metal gasket or are integrally stamped by a die; or welded as one piece; or glued together.

The thicker metal gasket is better in anti-loosening effect if being matched with the existing anti-loosening nut, and is mainly matched with the main nut and the auxiliary nut to be loosened; when the metal gasket is in a free loosening state, the existing auxiliary nut acts to prevent the free movement of the auxiliary nut, temporarily fix the metal gasket, wait for the vibration fastening of the next period, thus the anti-loosening effect is better-!

The anti-loosening structure comprises

The main nut is a common nut and is used for screwing the fixed end of the bolt,

the auxiliary nut is a common nut or a locknut, is used for being screwed on the fixed end of the bolt and is positioned at the outer side of the main nut,

the external thread of the screw rod of the bolt is used for coaxially screwing the internal threads of the main nut and the auxiliary nut,

the method is characterized in that:

the coaxial inclined plane thicker metal gasket is clamped between the main nut and the auxiliary nut;

or the coaxial thick metal washer with the point is clamped between the main nut and the auxiliary nut, when the salient point of the thick metal washer is arranged between the metal flat washer body and the circular plane at the upper end of the main nut, the vertex of the salient point is in spiral point contact with the circular plane at the upper end of the main nut screwed on the bolt;

or the convex point of the thick metal washer is between the metal washer main body and the circular plane at the lower end of the auxiliary nut, and the top point of the convex point is in spiral point contact with the circular plane at the lower end of the auxiliary nut screwed on the bolt;

when the top point of the convex point or the inclined plane on the inclined plane or the dotted thick metal gasket is in contact with the circular plane spiral point at one end of the main nut or the auxiliary nut, the main nut can only be screwed down, cannot be loosened and has the functions of stopping and locking by utilizing the gap between the internal thread of the auxiliary nut and the external thread of the bolt and utilizing the gap between the internal thread of the auxiliary nut and the external thread of the bolt;

or the main nut and the auxiliary nut are oppositely screwed by a certain pretightening force, and the anti-loosening structure locks the main nut and the auxiliary nut in a bidirectional spiral manner and is fixed on the screw rod of the bolt to form the anti-loosening structure.

The common nut is a fixing tool, the center of the common nut is provided with a hole, the inner side of the hole is provided with threads, the periphery of the hole is provided with mutually symmetrical regular hexagonal sides or square corners, the common nut is connected with external threads of bolts with the same specification in a screwed mode through the threads on the inner side of the round hole, a fastened piece A and a fastened piece B are fastened between the bolt head and the common nut in a screwed mode, and circular ring planes which are parallel to each other and perpendicular to a screw hole shaft are arranged at two ends of the common nut.

The locknut comprises a nut body and an annular elastic locking piece, wherein the annular elastic locking piece is arranged at the upper end of the nut body, is of an integrated structure with the nut body, bends towards the inner side of the nut body with threads, and forms an annular channel with the nut body; the inner diameter of the annular elastic locking piece is smaller than that of the inner threaded part of the nut body, or the annular elastic locking piece and the inner threaded part of the nut body are slightly axially or radially staggered. The annular elastic locking piece is either a nylon locking ring or a metal locking ring.

Further, a coating is arranged on the internal thread of the screw hole of the common nut, and rubber or non-setting gelatinous substances are coated on the coating and used for increasing the friction force between the nut and the bolt.

The anti-loosening screw pair comprises

One end of the bolt is a bolt head, and the other end of the bolt is a fixed end;

the anti-loosening structure is arranged at the fixed end of the bolt;

the first fastened piece and the second fastened piece are installed and fastened between the bolt head and the anti-loosening structure;

in some modes, a main flat washer or a main elastic washer is respectively arranged between the anti-loosening structure and the fastened component A, and the main flat washer is positioned between the main elastic washer and the fastened component A;

in some aspects, no primary flat washer or no primary elastomeric washer is provided between the anti-loosening structure and the fastened item a.

The anti-loosening principle of the utility model is as follows: the inclined plane or the inclined plane with the point is formed by improving the existing metal gasket, the auxiliary nut on the bolt is arranged on the basis of the common double-nut opposite-top screw in a relatively thick manner, the gap between the inner thread of the auxiliary nut and the outer thread of the bolt is utilized to enable the inner thread surface of the auxiliary nut and the outer thread surface of the bolt to fall obliquely, the two thread surfaces which are originally mutually parallel and spirally meshed are mutually obliquely crossed, mutually pried and acted by the action of the spiral lateral force, the loosening and loosening direction is locked and stretched, the friction force between the inner thread of the auxiliary nut and the outer thread surface of the bolt is suddenly increased, the highest point of the convex point or the inclined plane is a fixed point relative to the bolt, the auxiliary nut cannot be rotated, when the main nut is in loosening, the lateral force of the auxiliary nut is further increased, the anti-loosening purpose is achieved, and the main nut can not be screwed in the loosening direction. If the main nut and the auxiliary nut are screwed on the screw rod of the bolt, the main nut, the auxiliary nut and the bolt are coaxially and firmly bound into a whole, and the main nut, the auxiliary nut and the bolt cannot be retreated at all.

Only after the auxiliary nut is loosened by tools such as a spanner, the highest point of the convex point or the inclined plane on the metal gasket can be far away from the main nut or the auxiliary nut, the main nut can be loosened again, and finally the bolt can be disassembled to extract the bolt from the screw hole of the fastened piece, so that the metal gasket can be repeatedly disassembled and assembled for use.

To sum up, the metal gasket, the anti-loosening structure and the anti-loosening screw pair thereof have the following advantages:

1. the utility model based on the existing fastener has strong universality, and can be directly formed by adding the thick metal gasket on the existing double-nut anti-loosening structure;

2. the anti-loosening structure comprises four or more parts, and can be used upside down on the screw rod or can meet the actual requirements;

3. the structure of the scheme is simple, the processing and the production are convenient, and the cost is low;

4. the device is convenient to install and operate, and special tools are not needed;

5. the anti-loosening performance is good, when the auxiliary nut is fastened, the main nut can only be fastened and cannot be loosened, and the main nut does not loosen at all after vibrating;

6. the anti-loosening structure and principle of the scheme are compared with the nearest prior art CN204493402U, the anti-loosening structure principle, the using effect and the processing technology of the anti-loosening structure and principle are completely different, the auxiliary nut, the main nut and the bolt are still the same axis after being installed under the condition that the main nut or the auxiliary nut structure is not changed, the upper circular plane of the main nut and the lower circular plane of the auxiliary nut are not in direct contact, but an offset thick metal gasket is added between the upper circular plane and the lower circular plane of the main nut, so that the main nut and the auxiliary nut form an angle with each other, and after the main nut and the auxiliary nut are fully pre-tightened, the peak points of the salient points or the highest points of the inclined planes are in direct contact. The bolt bears the pretension pulling force, bears a small amount of side force, just can make thick metal washer partially, main nut, auxiliary nut and bolt fastening as an organic whole, and the axle of bolt is not crooked after the use, does not influence yield strength and tensile strength, and after the pretension, thick metal washer partially, main nut, auxiliary nut, bolt fastening as an organic whole relatively can not become flexible at all, therefore the locking reliability is high, and does not damage original all accessories in the use, easy to detach, repeatedly usable, and simple structure, processing technology, processing cost is very low.

Drawings

FIG. 1 is a front view of a dotted, thicker metal gasket of the present utility model;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a first mounting block diagram of the anti-loose thread set of FIG. 1;

FIG. 4 is a second mounting block diagram of the anti-loose thread set of FIG. 1;

FIG. 5 is an upper oblique view of an auxiliary nut of the present utility model;

FIG. 6 is a schematic view of the cross-sectional A-A configuration of FIG. 5;

FIG. 7 is a front view of a beveled thicker metal gasket in accordance with the present utility model;

FIG. 8 is a top view of FIG. 7;

fig. 9 is a third installation structure of the locking screw pair of fig. 7.

In the figure:

1. a thicker metal gasket; secondly, a main nut; thirdly, assisting the nut;

4. a bolt; fifthly, a screw rod; sixthly, internal threads;

7. an external thread; eighth, salient points; sixthly, a bolt head;

10. a fixed end; 11, an anti-loosening structure; 12, a circular ring plane;

13. an anti-loosening screw pair; 14, screw holes; 15, one end of the nut;

16. a metal flat washer body; 17, an annular channel; 18, annular elastic locking pieces;

19. a strip-shaped incision; 20, concave indentation; 21, locknuts;

22. a fastened member A; 23, fastening the second fastening piece; 24, the vertex of the partial thick metal gasket;

25. a common nut; 26, limiting step combination; a main flat gasket;

28. a main spring washer; 29, coating; 30, hexagonal side surfaces;

31. the other end of the nut; 32, inclined plane;

33. a gap between the internal thread of the auxiliary nut and the external thread of the screw rod; 34, a dish-shaped elastic washer;

35. a metal washer with inclined surface thicker than the inclined surface; 36, a thick metal gasket with a point; 37, round holes;

38. one end plane of the metal ring; 39, a nut body;

alpha. The upper and lower end surfaces form an included angle with each other.

Detailed Description

The utility model will now be further described with reference to the accompanying drawings and examples:

the thick metal gasket 1 provided by the utility model can be applied to various opposite-top anti-loosening structures 11 and anti-loosening screw pairs 13.

In fig. 1-9, a thick metal gasket 1 comprises a flat metal ring, wherein the periphery of the flat metal ring is round, the middle of the flat metal ring is a coaxial round hole, and the inclined surface is thick and is different in thickness between the upper end surface and the lower end surface of the metal gasket; the other is a convex point 8 arranged on a plane 38 at one end of the metal ring of the existing flat gasket, the thickness between the upper end surface and the lower end surface of the metal gasket is thicker or inclined, the included angle between the two end surfaces is alpha, and the angle between the two end surfaces is more than 0 degrees and less than 30 degrees, or the convex point 8 is pressed on the plane 38 at one end of the metal ring of the existing metal flat gasket body 16; or welding the fixed salient point 8 on one end plane 38 of the metal ring by using welding wires or welding rods with the same material; or the bump 8 is fixed by adhesive bonding. The height of the salient point 8 on the plane 38 at one end of the metal ring is at least 1/10-1 times, such as 1/5 times, 1/4 times, or 1/2 times, or 1 time, of the tooth distance of the external thread 7 of the screw 5 sleeved by the round hole 37 of the thicker metal gasket 1; the cross section of the salient point 8 perpendicular to the height is of any shape, and the radial length of the area is not less than 1/3 times, such as 1/2 times, 1 time and 2 times, of the pitch of the external thread 7 of the bolt 4; the shape of which is either one of circular, elliptical, rectangular, trapezoid, triangle or prism.

The internal thread 6 of the auxiliary nut 3 is or is provided with a coating 29, and the coating 29 is made of rubber or non-setting gelatinous substance and is used for increasing the friction force between the nut and the bolt and preventing the auxiliary nut 3 from being in a free loosening state when vibrating.

In fig. 7 to 9, one end face of the thicker metal washer 1 is inclined or both end faces are inclined, the auxiliary nut 3 is a prior locknut 21, and comprises a body nut 39 and an annular elastic locking piece 18, wherein the annular elastic locking piece 18 is arranged at the upper end of the nut body 39 and is in an integral structure with the nut body 39; the annular elastic locking piece 18 is bent towards the threaded inner side of the nut body 39 and forms an annular channel 17 with the nut body 39; the annular resilient locking tab 18 has an inner diameter that is smaller than the inner diameter of the threaded portion of the nut body 39 or the annular resilient locking tab 18 is slightly axially or radially offset from the threaded portion of the nut body 39. The limit step combination 26 is composed of more than one semicircular steps; the strip-shaped notch 19, the concave indentation 20 or more than 1 notch are formed. The elastic locking piece 18 is either a nylon locking ring or a metal locking ring.

In fig. 3, the anti-loosening structure 11 of the present utility model has a common nut 25 as the main nut 2, and a common nut 25 as the auxiliary nut 3, wherein the common nut 2 and the auxiliary nut 3 are formed by screwing the internal threads 6 of the main nut 2 and the auxiliary nut 3 onto the external threads 7 of the screw 5 in opposite directions, the two nuts can be interchanged, and the protruding points 8 are positioned at the upper end or the lower end of the thick metal washer 1 between the main nut 2 and the auxiliary nut 3, or can be reversed. The utility model provides a locking screw pair 13, which comprises a thicker metal washer 1, a bolt 4, a locking structure 11, a main flat washer 27, or a main elastic washer 28, wherein at least one surface of the thicker metal washer 1 at the lower end of the auxiliary nut 3 is provided with a convex point 8 to form the thicker metal washer 1, the fixed end 10 of the bolt 4 is penetrated into a fastened piece B23, a fastened piece A22, the main flat washer 27, the main elastic washer 28 and a screw hole 14 of the main nut 2, screwed according to preset torque, then penetrated into a round hole 37 of the thicker metal washer 1, screwed on an exposed external thread 7 of the bolt 4, and when the auxiliary nut 3 or the main nut 2 is contacted with the convex point 8 of the thicker metal washer 1, a certain pretightening moment is applied, the internal thread of the main nut 2 is tightly fixed on the external thread 7 of the bolt 4, so that the thicker metal washer 1, the bolt 4, the main nut 2, the nut 3, the main flat washer 27, the main elastic washer 28, the fastened piece A22 and the fastened piece 23 are firmly fastened together. After the main nut 2 and the auxiliary nut 3 are respectively pre-tightened, due to the addition and separation effect of the top points 24 of the thicker metal washers 1, the inner threads 6 of the auxiliary nut 3 are inclined on the outer threads 7 of the screw 5 by utilizing the gaps 33 between the inner threads 6 of the auxiliary nut 3 and the outer threads 7 of the screw 4, and the upper circular plane 12 of the main nut 2 and the lower circular plane 12 of the auxiliary nut 3 form an included angle alpha, so that the auxiliary nut 3 is sufficiently inclined and locked on the outer threads 7 of the screw 5 and cannot rotate backwards.

In fig. 4, the main nut 2 is a common nut 25 according to the present utility model, the auxiliary nut 3 is a common nut 25, the protruding point 8 is disposed between the auxiliary nut 3 and the thicker metal washer 1, and is integrated with the metal flat washer body 16 of the thicker metal washer 1, and the auxiliary nut 3 or the internal thread 6 is provided with a coating 29 for preventing the auxiliary nut 3 from loosening freely, and other structures and principles are the same as those described in fig. 3.

In fig. 7 to 9, an annular elastic locking piece 18, such as a nylon locking ring or a metal locking ring, is inlaid at one end of the auxiliary nut 3 or the nut body 39, an inclined plane thicker metal washer 35, an inclined plane 32 and an included angle alpha formed by the upper end face and the lower end face respectively are 5 degrees, 10 degrees, 15 degrees and 30 degrees are arranged between the auxiliary nut 3 and the main nut 2, so that the thicker metal washer 1 is formed, the locknut 21 of the auxiliary nut 3 is used for preventing the auxiliary nut 3 from loosening freely, and other installation structures and principles are the same as those in fig. 3 and are not repeated.

A main flat washer 27 or a main elastic washer 28 is respectively arranged between the anti-loosening structure 11 and the fastened part A22, and the main flat washer 27 is positioned between the main elastic washer 28 and the fastened part A22; any gasket can be omitted; wherein the primary spring washer 28 is either an existing split circular spring washer, an existing conical disk spring washer 34, an existing spherical disk spring washer 34, or any of the existing spring washers.

The main spring washer 28, the main flat washer 27, the common nut 25, the locknut 21 and the bolt 4 are all well known in the art, and the structure, the working principle, the material, the specification and the selection method thereof should be known to those skilled in the art and will not be repeated here.

The three mounting modes respectively correspond to the thickness, different materials and different specifications of different thicker metal washers, the bolt 4, the main nut 2, the auxiliary nut 3, the thicker metal washer 1 with the convex point 8 or the inclined plane in the scheme, and the thicker metal washer is mounted to achieve the same anti-loose purpose, and the vertex 24 of the thicker metal washer is in contact with the upper circular ring plane 12 of the main nut 2; or with the lower annular flat surface 12 of the auxiliary nut 3, the principle of action of which is the same.

Experiments prove that: when the main nut 2 is in back rotation, the auxiliary nut 3 is spirally and obliquely arranged on the external thread 7 of the screw rod 5 of the bolt 4 by the top 24 of the thicker metal gasket, so that the main nut 2 is locked in a unidirectional rotation way, and the main nut 2 can not be loosened at all by tightly supporting the spiral of the main nut 2 by the top 24 of the thicker metal gasket and by using a certain torque which can be large or small to screw the main nut 2 and the auxiliary nut 3.

The utility model relates to a thick metal gasket 1, which comprises a metal flat gasket body 16, wherein a fixing salient point 8 is arranged on the metal flat gasket body, the formed thick metal gasket 36 with a point and an inclined plane are made of stainless steel, carbon steel, manganese steel, alloy steel, iron, copper and other metals, and the formed thick metal gasket, an anti-loosening structure and an anti-loosening screw pair are used in the vibration anti-loosening fastening fields of railways, bridges, mines, aviation, aerospace, navigation, iron towers, wind power, nuclear power vehicles, military industry, vibration machinery, facilities and the like.

Finally, it should be noted that: the above embodiments are only for illustrating the technical scheme of the present disclosure, but not for limiting the same; while the present utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that; the specific embodiments of the present disclosure may be modified or some technical features may be replaced equivalently, without departing from the spirit of the technical disclosure, and they are all covered in the scope of the technical disclosure.

Claims (4)

1. The metal gasket comprises a flat metal ring with a round periphery and a coaxial round hole in the middle, and is formed by the metal gasket, and is characterized in that:

the metal gasket is a thick metal gasket (1), and the upper end face and the lower end face of the thick metal gasket are not parallel.

2. A metal gasket as set forth in claim 1 wherein: the thickness between the upper end surface and the lower end surface of the thicker metal gasket (1) is an inclined thicker metal gasket (35);

the upper end face and the lower end face of the metal ring of the inclined plane thicker metal gasket (35) form an included angle alpha, and the alpha is more than 0 degrees and less than 30 degrees.

3. An anti-loose structure comprising

The common nut (25) is a fixing tool, a hole is formed in the center of the common nut, threads are formed in the inner side of the hole, regular hexagonal sides or square corners which are symmetrical with each other are formed around the hole, the common nut is connected with external threads (7) of bolts (4) with the same specification in a screwed mode through internal threads (6) of the round holes, a fastened piece A (22) and a fastened piece B (23) are fastened between a bolt head (9) and the common nut (25) in a screwed mode, and circular ring planes (12) which are parallel to each other and perpendicular to the axis of the screw hole (14) are arranged at two ends of the common nut;

the locknut (21) comprises a nut body (39) and an annular elastic locking piece (18), wherein the annular elastic locking piece (18) is arranged at the other end (31) of the nut body (39) and is of an integrated structure with the nut body (39), and the annular elastic locking piece (18) is bent towards the inner side of a thread of the nut body (39) and forms an annular channel (17) with the nut body (39); the inner diameter of the annular elastic locking piece (18) is smaller than the inner diameter of the part of the internal thread (6) of the nut body (39), or the annular elastic locking piece (18) and the part of the internal thread (6) of the nut body (39) are slightly axially or radially staggered, and the annular elastic locking piece (18) is nylon or metal;

the internal thread (6) of the screw hole (14) of the common nut (25) is provided with a coating (29), and the coating (29) is coated with rubber or adhesive substances;

the main nut (2) is the common nut (25) and is used for screwing the fixed end (10) of the bolt (4), the auxiliary nut (3) is the common nut (25) or the locknut (21) and is used for screwing the fixed end of the bolt (4) and is positioned at the outer side of the main nut (2),

the external thread (7) of the screw rod (5) of the bolt (4) is used for coaxially screwing the internal threads (6) of the main nut (2) and the auxiliary nut (3),

the method is characterized in that:

a coaxial inclined plane thicker metal washer (35) is clamped between the main nut (2) and the auxiliary nut (3);

the vertex (24) of the thicker metal washer (1) is in spiral point contact with a circular ring plane (12) at one end of the other nut, a gap (33) is formed between an internal thread (6) of the auxiliary nut (3) and an external thread (7) of the bolt (4), the internal thread (6) of the auxiliary nut (3) and the external thread (7) of the bolt (4) are inclined, and the highest vertex (24) of the inclined plane (32) blocks the main nut (2) and cannot be loosened;

the main nut (2) and the auxiliary nut (3) are locked by the anti-loosening structure (11) in a bidirectional screw mode, and the anti-loosening structure is fixed on a screw rod (5) of the bolt (4).

4. Anti-loosening screw pair is characterized in that: comprising

A bolt (4) with one end being a bolt head (9) and the other end being a fixed end (10); the anti-loosening structure (11) is arranged at the fixed end (10) of the bolt (4); wherein, the first fastening piece (22) and the second fastening piece (23) are installed and fastened between the bolt head (9) and the anti-loosening structure (11);

a main flat washer (27) or a main elastic washer (28) is respectively arranged between the anti-loosening structure (11) and the fastened part A (22), and the main flat washer (27) is positioned between the main elastic washer (28) and the fastened part A (22);

the main elastic washer (28) is one of an open circular spring washer, a conical surface disc-shaped elastic washer (34), a spherical disc-shaped elastic washer (34) or any elastic washer;

and a washer is not arranged between the anti-loosening structure (11) and the fastened member A (22).

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