CN108061091A - A kind of screw retention locking method and never becoming loose bolt - Google Patents

Abstract

The invention discloses a bolt anti-loosening and locking method and a never-loosening bolt. The never-loosening bolt includes a bolt head and a screw rod integrally connected with the bolt head. The screw rod is composed of a right-hand thread section and a section with The right-handed thread section is composed of a left-handed thread section connected by a right-handed thread section, and the diameter of the right-handed thread section is larger than the diameter of the left-handed thread section. A right-handed thread nut is threaded on the right-handed thread section, and a left-handed thread nut is threaded on the left-hand thread section. , the right-handed threaded nut and the left-handed threaded nut are movably connected together to form a conjoined nut that can rotate relatively but cannot be separated. The present invention adopts the mutual restraining and mutual blocking functions of conjoined nuts to achieve the purpose of anti-loosening and locking, which is not only convenient for assembly, but also does not cause any damage to the used screws and nuts, and the screws and nuts can still be used continuously, saving costs .

Description

A kind of anti-loosening and locking method of bolts and never-loosening bolts

technical field

The invention relates to a bolt anti-loosening and locking method and a never-loosening bolt, belonging to the technical field of fasteners.

Background technique

Bolt is a commonly used fastener, widely used in various mechanical and electrical equipment. For general applications, there are no particularly strict requirements on the anti-loosening properties of the bolts. However, for the fields of automobiles, aviation, aerospace, and nuclear power plants, many equipment or components work in a vibrating environment for a long time, and the bolts and nuts are prone to loosening, which affects the normal operation of the equipment and even causes security incident.

In order to solve the problem of anti-loosening of bolts, various self-locking nuts have appeared in the existing fastener industry, which have complex structures, high production costs, inconvenient installation, and unsatisfactory anti-loosening effects. In addition, the working principle of the existing self-locking nuts is to use external force to twist the thread or pitch of the nut to obtain additional pre-tightening force and achieve the purpose of anti-loosening and locking. However, this method not only increases the screwing torque of the screw, but also the twisted and damaged thread or pitch cannot be recovered, so that the used nut or screw cannot be reused, which wastes resources.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a method for anti-loosening and locking of bolts and never loosening bolts, which not only can achieve the purpose of anti-loosening and locking, but also does not cause any damage to the used screws and nuts. Still can continue to use, save cost.

The present invention is constituted as follows: a method for locking bolts against loosening. First, a right-handed thread segment and a left-handed thread segment connected with the right-handed thread segment are processed on the screw rod of the bolt, and the right-handed thread segment is The diameter is larger than the diameter of the left-hand thread segment, and then a right-hand thread nut and a left-hand thread nut are movably connected together to form a conjoined nut that can rotate relatively but cannot be separated. At this time, the conjoined nut is screwed into the screw rod of the bolt , when screwing in the conjoined nut, turn the right-handed threaded nut clockwise so that the right-handed threaded nut on the conjoined nut is threaded with the right-handed threaded section on the screw rod, and at the same time turn the left-handed threaded nut counterclockwise to make the conjoined The left-handed threaded nut on the nut is threadedly connected with the left-handed threaded section on the screw until the right-handed threaded nut and the left-handed threaded nut are respectively located on both sides of the junction of the right-handed threaded section and the left-handed threaded section of the screw rod. At this time, the right-handed threaded nut is due to The left-handed thread nut cannot continue to rotate due to the restraining and blocking effects of the left-handed threaded nut. Similarly, the left-handed threaded nut cannot continue to rotate due to the restraining and blocking effects of the right-handed threaded nut. The junction with the left-hand thread section is self-locking to achieve the purpose of anti-loosening and locking.

In the above method, the contact end surfaces of the right-handed threaded nut and the left-handed threaded nut are movably connected and relatively rotatable.

At the same time, the present invention also provides a never-loosening bolt, including a bolt head and a screw rod integrally connected with the bolt head. The screw rod is composed of a right-handed thread section and a left-handed thread section connected with the right-handed thread section. composition, and the diameter of the right-handed thread section is greater than the diameter of the left-handed thread section, a right-handed threaded nut is threaded on the right-handed threaded section, and a left-handed threaded nut is threaded on the left-handed threaded section, and the right-handed threaded nut and The left-hand threaded nuts are movably connected together to form a conjoined nut that can rotate relative to each other but cannot be separated.

Further, an annular tapered groove is provided on the end surface of the right-handed threaded nut, and a tapered sleeve connected with the left-handed threaded nut is arranged on the end surface of the left-handed threaded nut, and the tapered sleeve is press-fitted in the annular tapered groove And can't withdraw from, thereby make right-handed thread nut and left-handed thread nut movably connected together, form a conjoined nut that can be rotated relatively but can't be separated.

Furthermore, the outer edge of the mouth of the tapered sleeve is provided with a circular chamfer.

Further, the right-handed threaded nut is concentric with the threaded hole on the left-handed threaded nut.

Further, the pitch of the right-handed threaded nut and the left-handed threaded nut is the same, so that the right-handed threaded nut and the left-handed threaded nut can rotate synchronously, ensuring that the right-handed threaded nut and the left-handed threaded nut can be screwed in or out synchronously.

Due to the adoption of the above-mentioned technical scheme, the present invention has the advantages that: the present invention uses the mutual restraint and mutual blocking of conjoined nuts to achieve the purpose of anti-loosening and locking. Any damage, screws and nuts can still continue to use, saving costs. Therefore, the invention has good anti-loosening and locking effect, simple structure, low manufacturing cost, and is convenient for batch production.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is an exploded view of the connecting nut.

Explanation of reference signs: 1-bolt head, 2-screw rod, 3-right-handed threaded nut, 4-left-handed threaded nut, 5-right-handed threaded section, 6-left-handed threaded section, 7-annular tapered groove, 8-cone Shaped sleeve, 9-round chamfer.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiments of the present invention: as shown in Fig. 1 and Fig. 2, the never-loosening bolt of the present invention includes a bolt head 1 and a screw rod 2 integrally connected with the bolt head 1, and the screw rod 2 consists of a section of right-handed thread Section 5 and a left-handed threaded section 6 connected with right-handed threaded section 5, and the diameter of right-handed threaded section 5 is larger than the diameter of left-handed threaded section 6, right-handed threaded section 5 is threaded with right-handed threaded nut 3 A left-handed threaded nut 4 is threadedly connected to the left-handed threaded section 6, an annular tapered groove 7 is provided on the end face of the right-handed threaded nut 3, and a ring-shaped tapered groove 7 is provided on the end face of the left-handed threaded nut 4 to connect with the left-handed threaded nut 4. An integrated tapered sleeve 8, the tapered sleeve 8 is pressed into the annular tapered groove 7 and cannot be withdrawn, so that the right-handed threaded nut 3 and the left-handed threaded nut 4 are movably connected together to form a relatively rotating but inseparable Conjoined nuts, and the threaded holes on the right-handed threaded nut 3 and the left-handed threaded nut 4 are concentric. The outer edge of the mouth of the tapered sleeve 8 is provided with a circular chamfer 9, which facilitates pressing the tapered sleeve 8 into the annular tapered groove 7 and improves assembly efficiency. The pitch of the right-handed threaded nut 3 and the left-handed threaded nut 4 is the same, so that the right-handed threaded nut 3 and the left-handed threaded nut 4 can rotate synchronously, ensuring that the right-handed threaded nut 3 and the left-handed threaded nut 4 can be screwed in or out synchronously .

The working principle of the present invention: firstly thread the screw rod 2 of the bolt into the connected part, then screw the conjoined nut into the screw rod 2 of the bolt, when screwing in the conjoined nut, rotate the right-handed threaded nut 3 clockwise to make the conjoined nut The right-handed threaded nut 3 on the body nut is threadedly connected with the right-handed threaded section 5 on the screw rod 2, and the left-handed threaded nut 4 is rotated counterclockwise at the same time, so that the left-handed threaded nut 4 on the conjoined nut and the left-handed threaded section on the screw rod 2 6 threaded connection until the right-handed threaded nut 3 and the left-handed threaded nut 4 are respectively located on both sides of the junction of the right-handed threaded section 5 and the left-handed threaded section 6 of the screw rod 2. At this time, the right-handed threaded nut 3 is The pinning effect and blocking effect can not continue to rotate, and the same left-handed threaded nut 4 cannot continue to rotate due to the pinning effect and blocking effect of the right-handed threaded nut 3, so that the conjoined nut can be connected between the right-handed threaded section 5 and the screw rod 2. The junction of the left-hand thread segment 6 is self-locking to achieve the purpose of anti-loosening and locking.

Claims (7)

1. A bolt anti-loosening locking method is characterized in that: first process a right-handed thread section (5) and a left-handed thread section connected with the right-handed thread section (5) on the screw rod (2) of the bolt (6), and make the diameter of the right-handed thread section (5) greater than the diameter of the left-handed thread section (6), then a right-handed threaded nut (3) and a left-handed threaded nut (4) are movably connected together to form a Connected nuts that can be rotated relatively but cannot be separated. At this time, screw the connected nuts into the screw rod (2) of the bolt. When screwing in the connected nuts, turn the right-handed threaded nuts (3) clockwise to make the connected nuts The right-handed threaded nut (3) on the screw rod (2) is threadedly connected with the right-handed threaded section (5) on the screw rod (2), and the left-handed threaded nut (4) is rotated counterclockwise at the same time, so that the left-handed threaded nut (4) on the conjoined nut Threaded connection with the left-hand thread section (6) on the screw rod (2), until the right-hand thread nut (3) and the left-hand thread nut (4) are respectively located on the right-hand thread section (5) and left-hand thread section ( 6) On both sides of the junction, at this time, the right-handed threaded nut (3) cannot continue to rotate due to the restraint and blocking effect of the left-handed threaded nut (4). 3) The pinning and blocking effects cannot continue to rotate, so that the conjoined nut can be self-locked at the junction of the right-handed thread section (5) and the left-handed thread section (6) of the screw rod (2) to achieve an anti-loosening lock tight purpose. 2 . The bolt locking method according to claim 1 , characterized in that: the contact end surfaces of the right-handed threaded nut ( 3 ) and the left-handed threaded nut ( 4 ) are movably connected and relatively rotatable. 3 . 3. A bolt that never loosens, comprising a bolt head (1) and a screw rod (2) that is integrated with the bolt head (1), characterized in that: the screw rod (2) consists of a right-handed thread section ( 5) and a left-handed threaded section (6) connected with the right-handed threaded section (5), and the diameter of the right-handed threaded section (5) is greater than the diameter of the left-handed threaded section (6), and the right-handed threaded section (5) ) is threaded with a right-handed threaded nut (3), and left-handed threaded section (6) is threaded with a left-handed threaded nut (4), and the right-handed threaded nut (3) is movably connected with the left-handed threaded nut (4) Together, they form a conjoined nut that can rotate relative to each other but cannot be separated. 4. The never-loosening bolt according to claim 3, characterized in that: an annular tapered groove (7) is opened on the end surface of the right-handed threaded nut (3), and an annular tapered groove (7) is opened on the end surface of the left-handed threaded nut (4). A tapered sleeve (8) connected to the left-handed threaded nut (4) is provided, and the tapered sleeve (8) is pressed into the annular tapered groove (7) and cannot be withdrawn, so that the right-handed threaded nut (3) It is movably connected with the left-hand threaded nut (4) to form a conjoined nut that can rotate relatively but cannot be separated. 5. The never-loosening bolt according to claim 4, characterized in that: the outer edge of the mouth of the tapered sleeve (8) is provided with a circular chamfer (9). 6. The never-loosening bolt according to claim 3, characterized in that: the threaded holes on the right-handed threaded nut (3) and the left-handed threaded nut (4) are concentric. 7. The never-loosening bolt according to claim 3, characterized in that: the pitch of the right-handed threaded nut (3) is the same as that of the left-handed threaded nut (4).