CN110725850A - Tension self-locking type anti-loosening double-nut screw - Google Patents

Abstract

The invention relates to a tension self-locking type anti-loosening double female screw, which comprises an A female screw and a B female screw that cooperate with each other, the A female screw and the B female screw have internal threads with the same inner diameter; the A female screw is The center is provided with a hexagonal prism with an internally threaded hole, and the outer periphery of the internally threaded hole is provided with a truncated cone-shaped tension boss; the B female screw is a hexagonal prism with an internally threaded hole in the center, and the outer periphery of the internally threaded hole is provided with a cone Table-shaped tension grooves. The structure of the invention is simple, stable and reliable, and can realize the function of tension self-locking and anti-loosening.

Description

Tension self-locking type anti-loose double female screw

technical field

The invention relates to the technical field of installation and maintenance of electric power facilities, in particular to a tension self-locking type anti-loosening double female screw.

Background technique

The working principle of the nut is to use the friction between the nut and the bolt for self-locking. However, the reliability of this self-locking is reduced under dynamic loads. In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. Among them, the use of lock nuts is one of the anti-loosening measures. There are also two types of lock nuts. One is to use two identical nuts to screw on the same bolt, and add a tightening torque between the two nuts to make the bolt connection reliable. The other is a special lock nut, which needs to be used together with a lock washer. The special anti-loosening nut is not a hexagonal nut, but a middle-round nut. There are 6 gaps on the circumference of the nut. These six gaps are not only the focal point of the tightening tool, but also the insertion place of the anti-loosening washer bayonet. . The second anti-loosening method is more reliable than the first, but the structure is relatively complex.

Modern iron towers are installed with reinforcement screws, even if the towers are designed with full towers and double mothers, they cannot solve the problem of loosening of the towers after long-term operation. The tower screws need to be tightened regularly.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a tension self-locking type anti-loosening double female screw with simple structure, stable and reliable.

The present invention adopts following technical scheme:

A tension self-locking type anti-loosening double female screw comprises a female A screw and a female B screw that cooperate with each other, and the female A screw and the female B screw have internal threads with the same inner diameter.

Further, the female screw A is a hexagonal column with an inner threaded hole in the center, and a truncated cone-shaped tension boss is arranged on the outer periphery of the inner threaded hole.

Further, the female B screw is a hexagonal column with an inner threaded hole in the center, and a truncated cone-shaped tension groove is arranged on the outer periphery of the inner threaded hole.

Further, the A female screw is provided with a drainage ring groove on the outer periphery of the tension boss.

Further, the opposite sides of the A female screw and the B female screw are provided with drainage slopes that cooperate with each other and are inclined to the same side.

Further, a plurality of drainage grooves communicated with the drainage ring groove are provided on the drainage inclined surface.

Further, the diameter of the bottom surface of the truncated cone of the tension boss is equal to that of the bottom surface of the truncated cone of the tension groove; the half cone angle α corresponding to the tension boss is half that of the tension groove. A cone angle β is 1.2 to 1.6 times.

Further, the half cone angle α corresponding to the tension boss is 1.5 times the half cone angle β corresponding to the tension groove.

Further, the half cone angle α corresponding to the tension boss is 6°.

Further, the half cone angle β corresponding to the tension groove is 4°.

The beneficial effect of the invention is that: the tension boss on the A female screw and the tension groove on the B female screw correspond to each other, and the B female screw forms an external pressure on the A female screw during the tightening process, causing A The internal cohesive force deformation of the female screw realizes the deformation of clenching and jamming. The invention increases the external extrusion-type cohesion force on the basis of maintaining the characteristics of the original traditional screw, so as to achieve the purpose of tightening without loosening.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of the present invention.

FIG. 2 is a schematic top view of the female screw B in FIG. 1 .

FIG. 3 is a schematic bottom view of the female screw B in FIG. 1 .

FIG. 4 is a schematic top view of the female screw A in FIG. 1 .

FIG. 5 is a schematic bottom view of the female screw A in FIG. 1 .

Among them, 1 A female screw, 2 B female screw, 3 tension boss, 4 tension groove, 5 drainage ring groove, 6 drainage slope, 7 drainage groove, 8 bolts, 9 internal thread holes, corresponding to α tension boss 1/2 cone angle, 1/2 cone angle corresponding to beta tension grooves.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Many specific details are set forth in the following description to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can do so without departing from the connotation of the present application. Similar promotion, therefore, the present application is not limited by the specific embodiments disclosed below.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that, for the convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific value should be construed as illustrative only and not as limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present application, it should be understood that the orientations indicated by orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and these orientations do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be construed as a limitation on the protection scope of the application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under other devices or constructions". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of this application.

Example 1

A tension self-locking type anti-loosening double female screw comprises A female screw 1 and B female screw 2 which cooperate with each other, and the A female screw 1 and B female screw 2 have internal threads with the same inner diameter.

The A female screw 1 is a hexagonal column with an inner threaded hole in the center, and a truncated cone-shaped tension boss 3 is arranged on the outer periphery of the inner threaded hole.

The B female screw 2 is a hexagonal column with an inner threaded hole in the center, and a frustum-shaped tension groove 4 is arranged on the outer periphery of the inner threaded hole.

The bottom surface of the truncated cone of the tension boss 3 and the bottom surface of the truncated cone of the tension groove 4 are equal in diameter; the half cone angle α corresponding to the tension boss 3 is the corresponding half of the tension groove 4 One is 1.2 times the cone angle β.

Example 2

A tension self-locking type anti-loosening double female screw comprises A female screw 1 and B female screw 2 which cooperate with each other, and the A female screw 1 and B female screw 2 have internal threads with the same inner diameter.

The A female screw 1 is a hexagonal column with an inner threaded hole 9 in the center, and a truncated cone-shaped tension boss 3 is arranged on the outer periphery of the inner threaded hole 9 .

The B female screw 2 is a hexagonal prism with an inner threaded hole 9 in the center, and a frustoconical tension groove 4 is arranged on the outer periphery of the inner threaded hole 9 .

The diameter of the bottom surface of the truncated cone of the tension boss 3 is equal to that of the bottom surface of the truncated cone of the tension groove 4; the half cone angle α corresponding to the tension boss 3 is the corresponding half of the tension groove A cone angle β is 1.6 times.

Example 3

A tension self-locking type anti-loosening double female screw comprises A female screw 1 and B female screw 2 which cooperate with each other, and the A female screw 1 and B female screw 2 have internal threads with the same inner diameter.

The A female screw 1 is a hexagonal column with an inner threaded hole in the center, and a truncated cone-shaped tension boss 3 is arranged on the outer periphery of the inner threaded hole.

The B female screw 2 is a hexagonal column with an inner threaded hole in the center, and a frustum-shaped tension groove 4 is arranged on the outer periphery of the inner threaded hole.

The diameter of the bottom surface of the truncated cone of the tension boss 3 is equal to that of the bottom surface of the truncated cone of the tension groove 4; the half cone angle α corresponding to the tension boss is half that of the tension groove. 1.5 times the cone angle β. The half cone angle refers to half of the cone angle corresponding to the truncated cone.

During use, first screw the A female screw into the bolt 8 and tighten it, and then screw in the B female screw. The tension boss of the A female screw is opposite to the tension groove of the B female screw. In the process of tightening the B female screw, The tension groove will gradually squeeze the tension boss, so that the A female screw is deformed, and the inner thread of the A female screw and the outer thread on the bolt are further tightened to achieve locking without loosening.

Embodiment 1 selects ∠α=1.2∠β, embodiment 2 selects ∠α=1.6∠β, and embodiment 3 selects ∠α=1.5∠β. If the angle difference is too small (less than 1.2), the contact area between the A female screw and the B female screw will be too small, and the deformation pitch of the A female screw will be shorter when it is tightened, which will affect the locking effect. Excessive angle difference (greater than 1.6) will weaken the extrusion force of the B female screw (cannot make the A female screw reach the required deformation) or require a large stroke to achieve the top tightening requirement, which is inconvenient to use and cannot meet the requirements. After repeated experiments and research, when ∠α is 1.2~1.6 of ∠β, especially 1.5 times in Example 3, it is the best. Within this range, the operation jacking stroke and jacking force are coordinated with each other, which is convenient to use.

Example 4

A tension self-locking type anti-loosening double female screw comprises A female screw 1 and B female screw 2 which cooperate with each other, and the A female screw 1 and B female screw 2 have internal threads with the same inner diameter.

The A female screw 1 is a hexagonal column with an inner threaded hole in the center, and a truncated cone-shaped tension boss 3 is arranged on the outer periphery of the inner threaded hole.

The B female screw 2 is a hexagonal column with an inner threaded hole in the center, and a frustum-shaped tension groove 4 is arranged on the outer periphery of the inner threaded hole.

The A female screw 1 is provided with a drainage ring groove 5 on the outer periphery of the tension boss 3 .

The opposite sides of the A female screw 1 and the B female screw 2 are provided with drainage inclined surfaces 6 that cooperate with each other and are inclined to the same side.

The drainage slope 6 is provided with several drainage grooves 7 communicating with the drainage ring groove 5 .

The bottom surface of the truncated cone of the tension boss 3 and the bottom surface of the truncated cone of the tension groove 4 are equal in diameter; the half cone angle α corresponding to the boss is the half cone angle corresponding to the groove 1.5 times β.

Since the bottom surface of the conical frustum of the tension boss 3 and the bottom surface of the conical frustum of the tension groove 4 are equal in diameter during the tightening process of the A female screw and the B female screw, the two will not fit together completely. There must be a gap. In case of rain and snow, the water can be discharged into the drainage ring groove under the guidance of the drainage groove. Since the overall bottom surface is inclined, the water will be further drained out of the drainage ring groove by the drainage groove on the drainage slope to avoid A Water accumulates in the space between the female screw and the B female screw to protect the screw from corrosion.

Example 5

A tension self-locking type anti-loosening double female screw comprises A female screw 1 and B female screw 2 which cooperate with each other, and the A female screw 1 and B female screw 2 have internal threads with the same inner diameter.

The A female screw 1 is a hexagonal column with an inner threaded hole in the center, and a truncated cone-shaped tension boss 3 is arranged on the outer periphery of the inner threaded hole.

The B female screw 2 is a hexagonal column with an inner threaded hole in the center, and a frustum-shaped tension groove 4 is arranged on the outer periphery of the inner threaded hole.

The A female screw 1 is provided with a drainage ring groove 5 on the outer periphery of the tension boss 3 .

The opposite sides of the A female screw 1 and the B female screw 2 are provided with drainage inclined surfaces 6 that cooperate with each other and are inclined to the same side.

The drainage slope 6 is provided with several drainage grooves 7 communicating with the drainage ring groove 5 .

The bottom surface of the truncated cone of the tension boss 3 and the bottom surface of the truncated cone of the tension groove 4 have the same diameter; the half cone angle α corresponding to the boss is 6°. The half cone angle β corresponding to the groove is 4°.

This embodiment is the best embodiment. When the half cone angle α and the half cone angle β are 6° and 4°, respectively, the height-diameter ratio of the A female screw and the B female screw is appropriate, and its self- Locks also work best.

On the basis of maintaining the original hardness, the A female screw can be made of steel with enhanced toughness; the hardness of the B female screw is 1-2 higher than that of the A female screw, and the brittleness cannot be increased.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (10)

1. The utility model provides a locking pair of box screw of tension self-locking type which characterized in that, it includes A box screw (1) and B box screw (2) of mutually supporting, A box screw (1) and B box screw (2) have the internal thread that the internal diameter is the same.

2. The tension self-locking anti-loosening double-female screw according to claim 1, wherein the A female screw (1) is a hexagonal prism provided with an internal thread hole (9) at the center, and the periphery of the internal thread hole (9) is provided with a tension boss (3) in the shape of a truncated cone.

3. The tension self-locking anti-loosening double female screw according to claim 2, wherein the B female screw (2) is a hexagonal prism provided with an internal threaded hole (9) at the center, and the periphery of the internal threaded hole (9) is provided with a tension groove (4) in the shape of a truncated cone.

4. The tension self-locking type anti-loosening double female screw according to claim 3, wherein the A female screw (1) is provided with a drainage ring groove (5) on the periphery of the tension boss (3).

5. The tension self-locking type anti-loose double female screw according to claim 4, characterized in that the opposite sides of the A female screw (1) and the B female screw (2) are provided with drainage slopes (6) which are mutually matched and inclined to the same side.

6. The tension self-locking anti-loose double-female screw according to claim 5, characterized in that a plurality of drainage grooves (7) communicated with the drainage ring groove (5) are arranged on the drainage inclined surface (6).

7. The tension self-locking anti-loosening double female screw as claimed in claim 6, wherein the diameters of the bottom surfaces of the truncated cones of the tension boss (3) and the tension groove (4) are equal, and the half conical angle α corresponding to the tension boss (3) is 1.2 ~ 1.6.6 times of the half conical angle β corresponding to the tension groove (4).

8. The tension self-locking anti-loose double-female screw as claimed in claim 6, wherein the diameters of the bottom surface of the truncated cone of the tension boss (3) and the bottom surface of the truncated cone of the tension groove (4) are equal; the half conical angle alpha corresponding to the tension boss (3) is 1.5 times of the half conical angle beta corresponding to the tension groove (4).

9. The tension self-locking type anti-loose double-female screw according to claim 8, characterized in that the corresponding half conical angle α of the tension boss (3) is 6 °.

10. The tension self-locking type anti-loose double-female screw according to claim 8, characterized in that the corresponding half conical angle β of the tension groove (4) is 4 °.

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