CN215333887U

CN215333887U - Novel locking fastening bolt structure

Info

Publication number: CN215333887U
Application number: CN202121661278.5U
Authority: CN
Inventors: 屈波
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2021-12-28
Anticipated expiration: 2031-07-21

Abstract

The utility model discloses a novel anti-loosening fastening bolt structure which comprises a high-strength bolt, wherein the end part of the high-strength bolt is sequentially sleeved with a gasket, a pre-tightening nut and a locking nut, and the pre-tightening nut and the locking nut are fixed through a plurality of fastening screws; the high-strength bolt end is provided with a standard connecting portion, and the end of the standard connecting portion is provided with a small-diameter connecting portion. Compared with the prior art, the utility model has the advantages that: the structure is simple, the use is convenient, and the design of the double nuts and the set screws can not only effectively prevent the high-strength bolt from loosening, but also lock the stress of the nuts and decompose part of the force of the bolt threads connected with the pre-tightening nuts, so that the stress of the bolt threads is relatively uniformly distributed, the aim of protecting the bolt from fatigue fracture caused by loosening and stress concentration is achieved, and equipment damage and huge economic loss caused by bolt loosening fracture are avoided; the appearance and the size can be determined according to different design conditions, and the applicability is wider.

Description

Novel locking fastening bolt structure

Technical Field

The utility model relates to the technical field of bolts, in particular to a novel anti-loosening fastening bolt structure.

Background

With the further comprehensive promotion of domestic economy, the development of aviation, high-speed rail, metallurgy, wind power, hydropower, large-scale engineering machinery and the like is rapid. The equipment required by various industries is vigorous. Wherein these large and small devices are not detachable from high strength bolts. High strength bolts do not function as well in normal operation of the equipment. However, the bolt is often loosened due to the severe vibration of the equipment, complicated stress and other factors during the use process. The fatigue fracture is caused, the large-scale equipment is seriously damaged, huge economic loss is brought to enterprises, and great potential safety hazards are brought to the life guarantee of staff. According to the long-term research and analysis of the equipment experts on the fracture reasons of the bolts, the conclusion is that more than 80 percent of the real reasons of the bolt failure are caused by bolt loosening. Because the bolt, once loosened, generates a great deal of energy which acts directly on the bolt and the equipment. Eventually causing the bolt to fail by fatigue fracture. Then, the bolt is "not loosen and keeps continuous, and breaks as soon as loosening".

Therefore, a new structure which has reliability and simple operation and can prevent the bolt from loosening needs to be researched.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems mentioned in the background technology and provides a novel anti-loosening fastening bolt structure.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: a novel anti-loose fastening bolt structure comprises a high-strength bolt, wherein a gasket, a pre-tightening nut and a locking nut are sequentially sleeved at the end part of the high-strength bolt, and the pre-tightening nut and the locking nut are fixed through a plurality of fastening screws;

the end part of the high-strength bolt is provided with a standard connecting part, the end part of the standard connecting part is provided with a small-diameter connecting part, the outer side of the standard connecting part is provided with a standard thread, the outer side of the small-diameter connecting part is provided with a small-diameter thread, a right-handed thread matched with the standard thread is arranged in the pre-tightening nut, a left-handed thread matched with the small-diameter thread is arranged in the locking nut, and the diameter of the small-diameter thread is smaller than the bottom diameter of the standard thread;

the pre-tightening nut and the locking nut are respectively provided with a screw hole, and the tightening screw is arranged in the screw hole.

Preferably, the pre-tightening nut is a right-handed standard-diameter nut.

Preferably, the locking nut is a left-handed small-diameter nut.

Preferably, the number of the set screws is not less than 3.

Compared with the prior art, the utility model has the advantages that: the structure is simple, the use is convenient, and the design of the double nuts and the set screws can not only effectively prevent the high-strength bolt from loosening, but also lock the stress of the nuts and decompose part of the force of the bolt threads connected with the pre-tightening nuts, so that the stress of the bolt threads is relatively uniformly distributed, the aim of protecting the bolt from fatigue fracture caused by loosening and stress concentration is achieved, and equipment damage and huge economic loss caused by bolt loosening fracture are avoided; the appearance and the size can be determined according to different design conditions, and the applicability is wider. Has strong practicability and market popularization value.

Drawings

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

Fig. 2 is a state diagram of the use of the present invention.

Fig. 3 is a schematic structural view of the lock nut of the present invention.

Fig. 4 is a schematic view of the set screw of the present invention.

Fig. 5 is a schematic diagram of the mechanism for pretensioning the nut of the present invention.

Fig. 6 is a schematic view of the structure of the gasket of the present invention.

Fig. 7 is a schematic structural view of the high-strength bolt of the present invention.

As shown in the figure: 1. locking nut, 2, set screw, 3, pre-tightening nut, 4, gasket, 5, high-strength bolt, 501, standard connecting part, 502, small-diameter connecting part, 5011, standard thread, 5022 and small-diameter thread.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the resulting manner or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or point connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

With the combination of the attached drawings, the novel anti-loosening fastening bolt structure comprises a high-strength bolt 5, wherein a gasket 4, a pre-tightening nut 3 and a locking nut 1 are sequentially sleeved at the end part of the high-strength bolt 5, and the pre-tightening nut 3 and the locking nut 1 are fixed through a plurality of fastening screws 2;

the end part of the high-strength bolt 5 is provided with a standard connecting part 501, the end part of the standard connecting part 501 is provided with a small-diameter connecting part 502, the outer side of the standard connecting part 501 is provided with a standard thread 5011, the outer side of the small-diameter connecting part 502 is provided with a small-diameter thread 5022, a right-handed thread matched with the standard thread 5011 for use is arranged in the pre-tightening nut 3, a left-handed thread matched with the small-diameter thread 5022 for use is arranged in the locking nut 1, and the diameter of the small-diameter thread 5022 is smaller than the bottom diameter of the standard thread 5011;

the pre-tightening nut 3 and the locking nut 1 are respectively provided with a screw hole, and the tightening screw 2 is arranged in the screw hole.

The pre-tightening nut 3 is a right-handed standard-diameter nut.

The locking nut 1 is a left-handed small-diameter nut.

The number of the set screws 2 is not less than 3.

When the method is implemented specifically, the nut is pre-tightened according to the set pre-tightening torque according to the diameter of the bolt thread; installing a locking nut; and installing a set screw.

The working principle of the utility model is as follows: under the severe working environment, when the high-strength bolt is subjected to severe vibration and bears huge alternating load, the pre-tightening nut may be loosened at the moment and has a left-handed tendency. At this time, the pre-tightening nut transmits the left-hand force to the locking nut through the set screw. Because the locking nut is a left-handed thread, when the locking nut is subjected to left-handed force, the locking nut can apply a force to the pre-tightening nut in turn under the action of the helix angle, and the force is opposite to the force of the pre-tightening nut to be loosened by the left-handed thread, so that the loosening of the pre-tightening nut is inhibited, and the purpose of preventing the bolt from loosening is achieved. The left-handed nut passes through the holding screw fastening back, and the left-handed nut plays three effect, and firstly the locking right-handed nut, secondly compress tightly the right-handed nut through the holding screw, will make right-handed nut and bolt external screw thread atress even relatively, and thirdly the left-handed nut bears the partly load when the bolt atress to reduce the right-handed nut load.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a novel locking set bolt structure, includes high strength bolt, its characterized in that: the end part of the high-strength bolt is sequentially sleeved with a gasket, a pre-tightening nut and a locking nut, and the pre-tightening nut and the locking nut are fixed through a plurality of set screws;

2. The novel anti-loose fastening bolt structure as claimed in claim 1, wherein: the pre-tightening nut is a right-handed standard-diameter nut.

3. The novel anti-loose fastening bolt structure as claimed in claim 1, wherein: the locking nut is a left-handed small-diameter nut.

4. The novel anti-loose fastening bolt structure as claimed in claim 1, wherein: the number of the set screws is not less than 3.