CN115773305A - Spotted nut, anti-loosening structure, anti-loosening thread pair and efficiency improving method thereof - Google Patents

Abstract

The invention discloses a spot nut, a locking structure, a locking thread pair and an effect improving method thereof. The spot nut (1) is characterized in that: one or two fixed asymmetric salient points (8) are arranged on the circular ring plane (12), the salient points (8) and the nut body (16) are made of different materials, the height of the salient points is at least 1/10-1 time of the pitch of the internal thread (6) of the screw nut (1) with points, and the cross section of the salient points is in any shape. Anti loosening structure (11) characterized in that: either the main nut (2) or the auxiliary nut (3) is a tapped nut (1), and the salient point (8) is positioned between the two. The anti-loosening thread pair (13) is characterized in that: the fixed end (10) of the bolt (4) is of an anti-loosening structure (11), and the convex points (8) enable the inner thread (6) surface of the auxiliary nut (3) and the outer thread (7) surface of the bolt (4) to be inclined and locked. The efficiency improving method is characterized in that: the pretightening force of the main nut (2) is increased as much as possible, the pretightening force of the auxiliary nut (3) is reduced, and the main nut (2) is ensured not to rotate backwards. Its advantages are low cost, simple structure and high anti-loosening performance.

Description

Spotted nut, anti-loosening structure, anti-loosening thread pair and efficiency improving method thereof

Technical Field

The invention relates to the field of anti-loose fasteners, in particular to a spot nut, an anti-loose structure, an anti-loose thread pair and an effect improving method thereof.

Background

The existing double-nut friction anti-loosening structure is characterized in that two nuts with the same rotation direction are abutted to outer threads of the same bolt and are twisted to generate abutting force between the two nuts, so that a main nut and a spring pad at the bottom generate friction and generate friction with an auxiliary nut on the upper surface, the double friction achieves the pre-tightening effect, and the phenomenon of loosening can still occur after violent vibration.

For this reason, prior art CN204493402U provides a locknut structure including a flat nut and a skew 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 thread hole axis of the inclined nut, the flat nut and the inclined nut are sequentially installed on the bolt, and the matching contact faces of the two nuts comprise the inclined face and are sequentially screwed down. The inclined plane is not perpendicular to the axis of the bolt, the upper part of the inclined plane generates a certain bending moment to the bolt, and the anti-loosening effect is enhanced by the bending moment. This case has the following disadvantages: 1. because the main nut and the auxiliary nut, one is a flat nut and the other is an inclined nut, after the main nut and the auxiliary nut are pre-tightened on the same bolt, the contact plane and the inclined plane are in overall contact, and the situation that a screw rod of the bolt is bent to one side at the overall contact surface cannot be avoided; 2. the bolt is bent, so that the bolt can be used only once and cannot be reused; 3. because the bolt is deformed and bent by the screwed thread between the two nuts, the nut with the downward bent part cannot be disassembled, and the nut can be used only once; 4. the bevel nut is complicated in bevel processing by a die or a cutting means, and is high in cost because materials are wasted; 5. because the screw rod of the bolt is bent, the yield strength and the tensile strength of the bolt are greatly reduced, and the bolt can be subjected to yield fracture from the bent part of the screw rod during severe vibration; 6. because the respective shafts of the flat nut and the inclined nut are respectively coaxial with the bolt shaft of the section pre-tightened by the flat nut and the inclined nut, namely, each thread tooth of the flat nut and each thread tooth of the inclined nut are respectively parallel to the thread tooth surface of the bolt of the section to be screwed, 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 on the screw and freely moves, the nut easily vibrates, rotates back and loosens on the outer thread of the screw without friction force.

My prior art CN217582823U discloses a nut, its locknut structure and locking screw thread pair, the nut characterized in that: the circular ring plane at one end of the common nut or the locknut is provided with a fixed salient point, and the salient point and the common nut or the locknut are homogeneous and fixed into a whole. Because the convex points are the same as the common nut or the locknut, and the hardness and the wear resistance of the convex points are the same, the hardness and the wear resistance of the convex points carried by the threaded nut with the points cannot be improved, after the vibration test of actual application and a transverse vibration test, the convex points are always quickly ground flat, the looseness-proof structure and the looseness-proof thread pair are easy to loosen, and a transverse vibration curve is quickly reduced in the actual measurement process. In particular, the convex points of the 304 stainless steel homogeneous spot nut are almost flat and loose after being tested.

In addition, in the transverse vibration testing process of the spot nut, the main nut is usually pre-tightened to a certain value of force, and when the auxiliary nut is usually pre-tightened to a certain value, people do not know the specific pre-tightening method for improving the anti-loosening effect of the spot nut, the anti-loosening structure and the anti-loosening screw pair.

Disclosure of Invention

In order to overcome the defects of the prior art, the proposal aims to provide a nut, a locking structure, a locking thread pair structure and a method thereof, which not only save cost, but also can improve locking effect.

The screw nut with the point comprises a common nut or a locknut, the periphery of the common nut or the locknut is hexagonal or square, a round hole is formed in the center of the common nut or the locknut, threads are arranged on the inner side of the round hole, a screw hole shaft is coaxial with a screw bolt shaft, the circular planes at the two ends of the common nut are perpendicular to the screw hole shaft,

fixed salient points are arranged on the circular ring plane at one end of the common nut or the locknut;

the bump with ordinary nut, or locknut body is as an organic whole fixed, its characterized in that: the one or two asymmetrically distributed convex points on the annular plane at one end of the nut body are combined with the nut body of the common nut or the locknut by different materials; or the two asymmetrically distributed convex points and the nut body are combined by the same material.

Furthermore, the height of the salient points is at least 1/10-1 time of the thread pitch of the internal threads of the screw hole of the common nut or the locknut; the radial length of the bottom area of the salient point is not less than 1/4 times of the pitch of the internal thread.

Further, the cross section of the salient point perpendicular to the height thereof is of an arbitrary shape.

Further, the cross section of the salient point perpendicular to the height of the salient point is in any shape of sector, circle, ellipse, rectangle, trapezoid, triangle or prism.

Furthermore, the convex points are fixedly connected with the plane of the circular ring, or the convex points are formed by cold heading with a common nut or a die integrated with a locknut; or welded as one; or are bonded into a whole by glue; or the circular ring plane at one end of the nut is drilled and assembled with the small screw into a whole through the inner screw thread.

Furthermore, 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 symmetrical regular hexagonal edges or square edges, the regular hexagonal edges or the square edges are in threaded connection with external threads of bolts with the same specification 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 threaded mode, and the two ends of the common nut are provided with circular ring planes which are parallel to each other and perpendicular to a screw hole axis.

Furthermore, the locknut comprises a nut body and an annular elastic locking sheet, wherein the annular elastic locking sheet is arranged at the upper end of the nut body and is of an integral structure with the nut body, and the annular elastic locking sheet is bent towards the inner side of the screw thread of the nut body and forms an annular channel with the nut body; the inner diameter of the annular elastic locking piece is smaller than that of the internal thread part of the nut body, or the annular elastic locking piece and the internal thread part of the nut body are slightly staggered axially or radially.

Furthermore, the internal thread of the screw hole of the common nut is provided with a coating, and the coating is coated with rubber or non-setting adhesive substances and is used for increasing the friction force between the nut and the bolt.

The nut with the point has better anti-loosening effect if matched with the existing anti-loosening nut, and is mainly prevented from loosening by the nut with the point; when the screw with point of this case is in free not hard up state, by current locknut effect, prevent the screw with point of this case free activity, fix temporarily the screw with point waits for the vibration fastening of next cycle, locking effect is better like this!

The anti-loosening structure comprises

A main nut for screwing the fixed end of the bolt,

the auxiliary nut is screwed on the fixed end of the bolt and positioned outside the main nut,

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

the method is characterized in that:

one of the main nut and the auxiliary nut is a common nut, or the other of the check nut and the auxiliary nut is the dotted nut;

when the nut with the point is a main nut, the salient point of the nut with the point is fixed on the circular plane at one end of the main nut, and the vertex of the salient point is in contact with the spiral point of the circular plane at one end of the auxiliary nut screwed on the bolt;

when the spot nut is an auxiliary nut, the salient point of the spot nut is fixed on the circular plane at one end of the auxiliary nut, and the vertex of the salient point is in contact with the spiral point of the circular plane at one end of the main nut screwed on the bolt;

when the top point of the convex point on the spot nut is in point contact with the circular plane spiral point at one end of the other nut, the main nut utilizes the gap between the auxiliary nut internal thread and the bolt external thread to enable the auxiliary nut internal thread surface and the bolt external thread surface to fall off and incline due to the function of the top point of the convex point on the spot nut, the auxiliary nut is locked in a one-way rotation mode in the loosening direction, the top point of the convex point blocks the main nut, the main nut can only be screwed and cannot be loosened, and the effects of stopping and loosening are achieved;

or the main nut and the auxiliary nut are screwed together with a certain pretightening force, and the main nut and the auxiliary nut are locked in a bidirectional spiral mode by the aid of the anti-loosening structure and are fixed on a screw rod of the bolt, so that the anti-loosening structure is formed.

The check thread pair of present case, its sign lies in: comprises that

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;

a fastened piece A and a fastened piece B 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 arranged between the anti-loosening structure and the fastened piece A respectively, and the main flat washer is positioned between the main elastic washer and the fastened piece A;

the main elastic washer is one of an open circular spring washer, a conical disc-shaped elastic washer, a spherical disc-shaped elastic washer and any elastic washer;

in some modes, the anti-loosening structure and the fastened piece A are not provided with a main flat washer or a main elastic washer.

The anti-loosening principle of the invention is as follows: the improvement on the basis of the common double-nut opposite-pushing screw is that any one or two of circular ring plane contact surfaces between the common double nuts are asymmetrically distributed on convex points on a circular ring plane, gaps between auxiliary nut internal threads and bolt external threads are utilized to enable the auxiliary nut internal thread surfaces and the bolt external thread surfaces to be originally parallel, two thread surfaces in spiral meshing are inclined, the two thread surfaces are crossed in an inclined mode, prized mutually and acted by spiral lateral forces, the loosening direction is seized and stretched, the friction force between the auxiliary nut internal threads and the bolt external thread surfaces is increased suddenly, so that the convex points are fixed points relative to the bolt and cannot be rotated, when a main nut is loosened, one or two convex points which are asymmetrically distributed on the circular ring plane abut against the main nut, the lateral force of the auxiliary nut is increased, the anti-loosening purpose is achieved, and the main nut is screwed and cannot be rotated in the loosening direction. If the main nut and the auxiliary nut are twisted on the screw rod of the bolt, the main nut, the auxiliary nut and the bolt are coaxially, tightly and firmly bound into a whole, and the bolt cannot rotate backwards. Because the material of bump is harder than the material of ordinary nut, or lock nut body, or wear-resisting, so the bump of this scheme is more difficult to be worn and torn than the current bump with ordinary nut, or lock nut body homogeneity to practiced thrift the whole cost of spot nut, promoted the quality and the locking effect of spot nut, saved the whole cost of using the wear-resisting material of stereoplasm with spot nut, this is just as with good steel on the cutting edge, reaches good locking effect promptly, has practiced thrift the cost again.

Only after the auxiliary nut is loosened by tools such as a spanner, the salient point can be far away from the main nut or the auxiliary nut, the main nut can be loosened again, the bolt can be disassembled finally, the bolt is drawn out from the screw hole of the fastened piece, and the auxiliary nut can be repeatedly disassembled, assembled and disassembled for use.

The effect improving method of the anti-loosening thread pair comprises the following steps:

the pre-tightening of the main nut and the auxiliary nut increases the pre-tightening force of the main nut as much as possible when the whole pre-tightening force of the anti-loosening thread pair is fixed, the pre-tightening force of the auxiliary nut is reduced, the minimum pre-tightening force of the auxiliary nut meets the requirement that the main nut is not suitable for being reversed during vibration, and the whole pre-tightening force of the main nut and the auxiliary nut is gradually increased or equal to the fixed whole pre-tightening force of the anti-loosening thread pair.

In summary, the spot nut, the anti-loosening structure and the anti-loosening thread pair have the following advantages:

1. the scheme is based on the invention of the existing fastener, and has strong universality;

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

3. the scheme has the advantages of simple structure, convenient processing and production and low cost;

4. the scheme is convenient to install and operate, and no special tool is needed;

5. the anti-loosening performance of the anti-loosening nut is better than that of a homogeneous screw nut with a point in the prior art CN217582823U, when the auxiliary nut is fastened, the main nut can only be tightened but not loosened, and the main nut does not loosen a little after vibrating;

6. according to the scheme, the two salient points are asymmetrically distributed on the plane of the circular ring, and the two points with small volume are used, so that the falling inclination of the screw nut with the point on the bolt is larger, and the anti-loosening effect is better;

7. the anti-loose structure and the principle of the scheme are compared with those of the most similar prior art CN204493402U, the anti-loose structure principle, the using effect and the processing technology of the anti-loose structure and the principle are completely different, the auxiliary nut, the main nut and the bolt still have the same axis after being installed, the upper circular ring plane of the main nut and the lower circular ring plane of the auxiliary nut do not directly contact but form an angle with each other, and after full pre-tightening, a gap is formed, and the convex points are directly contacted with each other. When the bolt bears the pretension force, bear a small amount of yawing force, just can make main nut, assist nut and bolt fastening integrative, the axle of bolt is not crooked after the use, do not influence yield strength and tensile strength, after the pretension, main nut, assist nut, the bolt is relatively fastened as an organic whole, can not become flexible at all, consequently locking reliability is high, and do not damage original all accessories in the use, and is quick detachable, repeatedly usable, simple structure, and processing technology is simple, only one or two solder joints, and the processing cost is very low.

8. The application method for the auxiliary anti-loosening thread pair pre-tightening has the advantages that the pre-tightening torque of the main nut is increased as much as possible, the pressure of the convex points on the auxiliary nut is reduced, the main nut can be prevented from rotating backward, and accordingly the auxiliary nut is inclined and prevented from rotating backward due to the fact that the auxiliary nut is a tapped nut, residual axial force of the maximum anti-loosening thread pair after vibration can be kept, and the best anti-loosening effect is achieved.

Drawings

FIG. 1 is one of the front views of the dotted nut of the present invention;

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

FIG. 3 is a view of the installation of FIG. 1 in a locking thread set;

FIG. 4 is another installation configuration of FIG. 1 in a locking thread pair;

FIG. 5 is a second top oblique view of the dotted nut of the present invention;

FIG. 6 isbase:Sub>A schematic sectional view A-A of FIG. 5;

FIG. 7 is a bottom view of FIG. 5;

FIG. 8 is a view of the installation of FIG. 5 in a locking thread set;

FIG. 9 is a third front view of the dotted nut of the present invention;

FIG. 10 is a top view of FIG. 9;

FIG. 11 is a fourth front view of the dotted nut of the present invention;

fig. 12 is a top view of fig. 11.

In the figure:

1. a dotted nut; 2, a main nut; 3, auxiliary nuts;

4. a bolt; 5, a screw rod; 6, internal threads;

7. an external thread; 8, salient points; bolt head 9;

10. a fixed end; 11, a locknut structure; a circular ring plane;

13. a locking thread pair; 14, screw holes; 15, one end of the nut;

16. a nut body; an annular channel; 18, an annular elastic locking sheet;

19. strip-shaped notches; concave indentation; a locknut;

22. a fastened piece A; a fastened piece B; apex of bump 24;

25. a common nut; 26, combining limit steps; a primary flat washer;

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

31. the other end of the nut; a gap between the main nut and the auxiliary nut;

33. a gap between the auxiliary nut internal thread and the screw rod external thread; disc spring washer 34.

Detailed Description

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

the screw 1 with the point can be applied to various opposite-vertex anti-loosening structures 11 and anti-loosening screw pairs 13.

In fig. 1 to 8, a dotted nut 1, including a conventional common nut 25, or a conventional locknut 21, has a nut mold cold heading process with a cavity on a circular plane 12 at one end, and a different material or two metal or non-metal salient points 8 asymmetrically distributed on the circular plane 12 at one end of a nut body 16 are pressed on the common nut 25, or the circular plane 12 at one end of the conventional locknut 21; or the salient points 8 are welded and fixed on the circular ring plane 12 by welding wires or welding rods; or the salient points 8 are fixed on the circular ring plane 12 by gluing; or a hole is drilled on the annular plane 12 at one end of the nut body 16, and the salient point 8 is assembled and fixed by an inner screw thread and a small screw. The height of the salient points 8 on the circular ring plane 12 is at least 1/10-1 time of the pitch of the internal thread 6 of the screw hole 14 of the existing common nut 25 or the existing locknut 21; the cross section of the convex point 8 vertical to the height is in any shape, the radial length of the area is not less than 1/4 times of the pitch of the internal thread 6, or the cross section is in a fan shape, or the cross section is in any shape such as a round shape, an oval shape, a rectangular shape, a trapezoid shape, a triangular shape or a prismatic shape.

The material of one salient point 8 is different from that of the body 16 of the threaded nut 1, and the material of the salient point 8 is hard and wear-resistant, such as: a, combining a 304 stainless steel nut body 16 with 2205 stainless steel salient points 8; b, combining 2205 stainless steel nuts with 2207 stainless steel salient points 8; c, combining the nut body 16 made of the medium carbon steel with the 2205 stainless steel salient points 8; d, combining the high-carbon steel nut with the high-strength alloy steel salient points 8; e, combining the 301 stainless steel nut body 16 with the high-strength alloy steel salient points 8; f, combining the copper nut body 16 with the 2205 stainless steel salient points 8; g, combining the aluminum alloy nut body 16 with the stainless steel salient points 8; h, combining the alloy steel nut body 16 with other high-strength alloy steel salient points 8; i,304 stainless steel nut body 16 is combined with 301 stainless steel salient point 8, etc. The combination of the nut main body 16 and the convex points 8 made of different materials increases the strength, hardness and wear resistance of the original homogenous spot nut 1, is obviously different from the original homogenous spot nut, reduces the cost of the homogenous spot nut, increases the rigidity and wear resistance, improves the anti-loosening performance, achieves different expected effects, prevents a transverse vibration curve from rapidly descending, and enables the low-strength spot nut to achieve the effect and the effect of the high-strength spot nut.

Or two salient points 8 are asymmetrically distributed on the annular plane 12 at one end of the nut body 16, and the two salient points 8 and the nut body 16 are made of the same material combination, and are non-metal, such as carbon fiber and plastic; or metallic, such as 201 stainless steel; 2205 stainless steel; is also made of low-carbon steel; the alloy steel is adopted; both copper; iron, aluminum alloys.

The internal thread 6 of the dotted nut 1 is provided with a coating 29, and the coating 29 is made of rubber or non-setting adhesive 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. 5 to 8, the conventional locknut 21 includes a nut body 16 and an annular elastic locking piece 18, wherein the annular elastic locking piece 18 is arranged at the upper end of the nut body 16 and is integrated with the nut body 16; the annular elastic locking piece 18 is bent towards the inner side of the thread of the nut body 16 and forms an annular channel 17 with the nut body 16; the inner diameter of the annular elastic locking piece 18 is smaller than the inner diameter of the threaded part of the nut body 16, or the annular elastic locking piece 18 and the threaded part of the nut body 16 are slightly axially or radially staggered. The limit step combination 26 is composed of more than one semicircular step; the strip-shaped cut 19 or the concave indentation 20 is provided with more than 1.

In fig. 3, the anti-loose structure 11 of the present invention is formed by screwing the internal threads 6 of the main nut 2 and the auxiliary nut 3 on the external threads 7 of the screw 5 in opposite directions, the two nuts can exchange two nut positions, and two salient points 8 asymmetrically distributed on the annular plane 12 at one end of the nut body 16 are located between the main nut 2 and the auxiliary nut 3. The check thread pair 13 comprises a bolt 4, a check structure 11, a main flat washer 27 or a main elastic washer 28, wherein a convex point 8 is arranged on a circular ring plane 12 at the lower end of an auxiliary nut 3 to form the dotted nut 1 of the invention, a fixed end 10 of the bolt 4 is inserted 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 and is screwed up according to preset torque, the auxiliary nut 3 is screwed up on an exposed external thread 7 of the bolt 4, the auxiliary nut 3 is the dotted nut 1 with the convex point 8 of the invention, when a convex point peak 24 of the convex point 8 on the circular ring plane 12 at one end of the auxiliary nut 3 is contacted with the circular ring plane 12 on the main nut 2, a certain pre-tightening torque is applied to ensure that the internal thread of the dotted nut 1 formed by the main nut 2 and the auxiliary nut 3 with the convex point 8 is fixed on the external thread 7 of the bolt 4, and the bolt 4, the main nut 2, the auxiliary nut 3, the main flat washer 27, the main elastic washer 28, the fastened piece 22 and the fastened piece A23 are firmly and are integrally fastened. After main nut 2, assistance nut 3 pretension respectively, because the effect of separating of adding of bump 8, utilize the clearance 33 of assisting between 3 internal threads of nut 6 and the 4 external threads of bolt 7, make and assist 3 internal threads of nut 6 and fall to one side on the external threads 7 of screw rod 5, and main nut 2 and the nut body 16 contactless of assisting nut 3 and gapped, just can make and assist nut 3 fully fall to one side, lock on the external threads 7 of screw rod 5, can not move back.

In fig. 4, the main nut 2 is the dotted nut 1 of the present invention, the auxiliary nut 3 is the ordinary nut 25, the convex point 8 is arranged between the main nut 2 and the auxiliary nut 3 and is integrated with the main nut 2, 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 have the same principle as that described in fig. 3.

In fig. 8, the nut body 16 of the auxiliary nut 3 is one of the existing locknuts 21, the circular ring plane 12 at the lower end of the auxiliary nut 3 is provided with the salient points 8 to form the pointed nut 1 of the present invention, the locknut 21 of the auxiliary nut 3 is used for preventing the auxiliary nut 3 from being loosened freely, and other installation structures and principles are the same as those in fig. 3 and are not repeated.

In fig. 9 to 10, two salient points 8 are asymmetrically distributed on the annular plane 12 at one end of the nut body 16. The said asymmetry is set on one side of the diameter of the circular plane 12 to ensure that the nut with two points can be obliquely set on the bolt 4 and the main nut 2.

In fig. 11 to 12, the tapped nut 1 has 2 salient points 8, the longitudinal section of each salient point 8 is rectangular, the cross section of each salient point 8 is in the shape of two sectors, and the two salient points 8 are arranged on one side of the diameter and asymmetrically distributed relative to the center of a circular ring plane, so that the auxiliary nut 3 of the anti-loosening screw pair 13 is pre-tightened and then obliquely arranged on the bolt 4, that is, the axis of the auxiliary nut 3 is not coincident with the axis of the bolt 4 to form an angle, so that the internal thread 6 of the auxiliary nut 3 is pre-tightened and locked on the external thread 7 of the bolt 4 and cannot be rotated or loosened.

A main flat washer 27 or a main elastic washer 28 is respectively arranged between the locknut structure 11 and the fastened piece A22, and the main flat washer 27 is positioned between the main elastic washer 28 and the fastened piece A22; or no gasket is arranged; the main elastic washer 28 is either an existing open circular spring washer, an existing conical disc-shaped elastic washer, an existing spherical disc-shaped elastic washer or any one of the existing elastic washers.

The main spring washer 28, the main flat washer 27, the common nut 25, the locknut 21 and the bolt 4 are all the existing mature technologies, and the structure, the working principle, the material, the specification and the selecting method thereof are all mastered by the ordinary skilled person in the field, and the description thereof is not repeated here.

The three mounting modes respectively correspond to different nut thicknesses, thread arrangement modes, different materials and different specifications, the main nut 2 and the auxiliary nut 3, namely the spot nut with the salient points 8 or the existing nut, and the three mounting modes are mounted to achieve the same anti-loosening purpose, but only one salient point 8 is designed on the upper annular plane 12 of the main nut 2; one is designed on the lower annular flat 12 of the auxiliary nut 3 and functions as such.

Experiments prove that: when the main nut 2 is retreated, the auxiliary nut 3 is spirally and obliquely arranged on the external thread 7 of the screw rod 5 of the bolt 4 through the convex point 8, the main nut 2 and the auxiliary nut 3 are bidirectionally locked if the main nut 2 and the auxiliary nut 3 are screwed down by using a certain torque with variable or small magnitude, and the auxiliary nut 3 and the main nut 2 cannot be loosened.

If the test is carried out by using the M16 spot nut 1, the nut body 16 made of 2205 stainless steel and the welded salient points 8 made of ER2209 duplex stainless steel as national inspection notice numbers 2022586290 and 2022466101, the borne salient points 8 are far harder than the 304 salient points 8, and the 304 salient points 8 are basically ground flat. The non-homogeneous ER2209 convex points 8 have better anti-loosening performance. If the main nut 2 is pre-tightened by 50KN, 60KN and 67KN respectively, and the auxiliary nut 3 is pre-tightened by 18KN,8KN and 1KN respectively, the overall pre-tightening force of the anti-loosening thread pair is 68KN, and the anti-loosening effect of vibration is gradually increased through a transverse vibration machine test. Therefore, when the overall pretightening force is constant, the pretightening force of the main nut 2 is increased as much as possible, the minimum pretightening force of the auxiliary nut 3 is reduced, the requirement that the main nut 2 does not rotate during vibration is met, and the overall pretightening force of the main nut 2 and the auxiliary nut 3 is gradually increased or equal to the overall pretightening force set by the anti-loosening thread pair 13 is met. When the pretightening force of the main nut 2 IS 60KN, the pretightening force of the auxiliary nut 3 IS 8KN, and the overall pretightening force IS about 68KN, the IS016130 IS used: carrying out a transverse vibration test with the amplitude of +/-0.8 mm according to the 2015 standard; frequency 12,5hz; molybdenum disulfide lubricant is smeared on the bearing surfaces of the internal threads 6 of the main nut 2 and the auxiliary nut 3 and the external threads 7 of the bolt 4, and the detection result shows that the residual axial force/initial axial force reaches 93.89-96.06 percent, which is far more than 60 percent of that of the Japanese Hard Lock locknut under the same test condition.

The nut 1 with the point is the existing common nut 25, or one or two salient points 8 which are asymmetrically distributed on the circular ring plane 12 at one end of the nut body 16 are fixed on the circular ring plane 12 at one end of the existing locknut 21, the salient points 8 and the nut body 16 are made of stainless steel, carbon steel, manganese steel, alloy steel, iron, copper or other metals or are made of non-metals, and the nut structure with the point and the locknut and the lockthread pair which are formed by the nut structure with the point and the locknut are used in the vibration anti-loosening fastening fields of railways, bridges, mines, aviation, aerospace, navigation, iron towers, wind power, nuclear power, vehicles, vibration machines, facilities and the like.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present disclosure, and not for limiting the same; although the present disclosure has been described in detail with reference to preferred embodiments, those skilled in the art will appreciate that; modifications to the embodiments of the present disclosure, or equivalent substitutions for some features, may be made without departing from the spirit of the present disclosure, which should be considered to be within the scope of the claims.

Claims (10)

1. The spot nut comprises a common nut (25) or a locknut (21), the periphery of the spot nut is hexagonal or square, a round hole is arranged in the center of the spot nut, threads are arranged on the inner side of the round hole, a bolt shaft is coaxial with the round hole, the circular planes (12) at the two ends of the nut are vertical to the bolt shaft,

a fixed salient point (8) is arranged on the circular ring plane (12) at one end (15) of the common nut (25) or the locknut (21);

the salient point (8) and the nut body (16) of the common nut (25) or the locknut (21) are fixed into a whole, and the locknut is characterized in that:

the one or two salient points (8) which are asymmetrically distributed on the circular ring plane (12) at one end of the nut body (16) are combined with the nut body (16) of the common nut or the locknut (21) by different materials; or the two asymmetrically distributed salient points (8) and the nut body (16) are combined by the same material.

2. The spot nut of claim 1, wherein: the height of the salient point (8) is at least 1/10-1 time of the pitch of the internal thread (6) in the screw hole (14) of the common nut (25) or the locknut (21); the radial length of the bottom area of the salient point (8) is not less than 1/4 times of the pitch of the internal thread (6).

3. The spot nut of claim 1, wherein: the cross section of the salient point (8) perpendicular to the height of the salient point is of any shape.

4. The spot nut of claim 3, wherein: the cross section of the salient point (8) perpendicular to the height thereof is in any shape of sector, or circle, or ellipse, or rectangle, or trapezoid, or triangle, or prism.

5. The spot nut according to any one of claims 1-4, wherein: the salient points (8) are fixedly connected with the circular ring plane (12), or are formed by cold heading with a common nut (25) or a die integrated with a locknut (21); or welded as one; or are integrally bonded by glue; or a circular ring plane (12) at one end of the nut is drilled and is assembled with the small screw into a whole through the inner screw thread.

6. The spot nut of claim 1, wherein: the common nut (25) 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 symmetrical regular hexagonal edges or square edges, the regular hexagonal edges or the square edges are spirally connected with the external threads (7) of the bolt (4) with the same specification through the internal threads (6) of the round hole, a fastened piece A (22) and a fastened piece B (23) are spirally fastened between the bolt head (9) and the common nut (25), and the two ends of the common nut are provided with circular ring planes (12) which are parallel to each other and vertical to the axis of the screw hole (14); the internal thread (6) of the screw hole (14) of the common nut (25) is provided with or not provided with a coating (29); or a coating (29) is arranged, and rubber or adhesive sticker-like substances are coated on the coating (29).

7. The spot nut of claim 1, wherein: the anti-loose nut (21) comprises a nut body (16) and an annular elastic locking sheet (18), the annular elastic locking sheet (18) is arranged at the other end (31) of the nut body (16) and is of an integrated structure with the nut body (16), the annular elastic locking sheet (18) is bent towards the inner side of the screw thread of the nut body (16) and forms an annular channel (17) with the nut body (16); the inner diameter of the annular elastic locking sheet (18) is smaller than the inner diameter of the internal thread (6) part of the nut body (16), or the annular elastic locking sheet (18) and the internal thread (6) part of the nut body (16) have slight axial or radial dislocation.

8. A locking structure comprising

A main nut (2) for screwing the fixed end (10) of the bolt (4),

the auxiliary nut (3) is screwed at 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 thread (6) of the main nut (2) and the auxiliary nut (3),

the method is characterized in that:

one of the main nut (2) and the auxiliary nut (3) is a common nut (25) or a locknut (21), and the other one is a spot nut (1);

when the spot-bearing nut (1) is a main nut (2), the salient points (8) of the spot-bearing nut are fixed on the circular plane (12) at one end of the main nut (2), and the vertexes (24) of the salient points (8) are in spiral point contact with the circular plane (12) at one end of the auxiliary nut (3) screwed on the bolt (4);

when the spot-bearing nut (1) is an auxiliary nut (3), the salient points (8) of the spot-bearing nut (1) are fixed on the circular plane (12) at one end of the auxiliary nut (3), and the vertexes (24) of the salient points (8) are in spiral point contact with the circular plane (12) at one end of the main nut (2) screwed on the bolt (4);

when the vertex (24) of the salient point (8) on the spot nut (1) is in spiral point contact with the circular ring plane (12) at one end of the other nut, the main nut (2) utilizes the gap (33) between the internal thread (6) of the auxiliary nut (3) and the external thread (7) of the bolt (4) due to the effect of the vertex (24) of the salient point on the spot nut (1) to enable 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 off obliquely, the auxiliary nut (3) is locked in one-way rotation in the loosening direction, the vertex (24) of the salient point blocks the main nut (2), and the main nut (2) can only be screwed and cannot be loosened to play a role in stopping and loosening prevention;

or the main nut (2) and the auxiliary nut (3) are screwed together with a certain pretightening force, and the main nut (2) and the auxiliary nut (3) are bidirectionally and spirally locked by the anti-loosening structure (11) and are fixed on the screw (5) of the bolt (4).

9. Locking screw thread is vice, its characterized in that: comprises that

One end of the bolt (4) is a bolt head (9), and the other end of the bolt is a fixed end (10); the anti-loosening structure (11) is arranged at the fixed end (10) of the bolt (4); wherein a fastened piece A (22) and a fastened piece B (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 arranged between the anti-loose structure (11) and the fastened piece A (22), and the main flat washer (27) is positioned between the main elastic washer (28) and the fastened piece A (22);

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

any gasket is not arranged between the anti-loose structure (11) and the fastened piece A (22).

10. The effect improving method of the anti-loosening thread pair is characterized in that:

the pre-tightening of the main nut (2) and the auxiliary nut (3) increases the pre-tightening force of the main nut (2) as much as possible when the overall pre-tightening force of the anti-loosening screw thread pair (13) is constant, reduces the pre-tightening force of the auxiliary nut (3), and meets the requirement that the minimum pre-tightening force of the auxiliary nut (3) does not cause the main nut (2) to rotate backwards during vibration and the requirement that the overall pre-tightening force of the main nut (2) and the auxiliary nut (3) is gradual or equal to the determined overall pre-tightening force of the anti-loosening screw thread pair (13).

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