CN202338551U

CN202338551U - Self-locking bolt capable of automatically locking and loosening

Info

Publication number: CN202338551U
Application number: CN2011204573377U
Authority: CN
Inventors: 彭跃立; 齐春峰; 张永生; 陈子寅; 黄玉强
Original assignee: China Railway 15th Bureau Group Co Ltd
Current assignee: China Railway 15th Bureau Group Co Ltd
Priority date: 2011-11-17
Filing date: 2011-11-17
Publication date: 2012-07-18
Anticipated expiration: 2021-11-17

Abstract

The utility model discloses a self-locking bolt capable of automatically locking and loosening, relating to a self-locking bolt. A connecting rod (4) is sleeved with a spring (5); a threaded head (11) at the upper end of the connecting rod (4) is arranged in an upper sinking part (1) after passing through an inner thread (3) of a screwing end (2); the upper end of the spring (5) abuts against the step of an unthreaded hole (6) below the inner thread (3); the lower end of the spring (5) abuts against the upper end surface of a tapered block (10); the tapered block (10) is inserted in the lower end opening of the unthreaded hole (6); and an expanding groove (9) is widened by the tapered block (10), so that the expansion self-locking of an outer thread (7) is realized. Since tapered block has a push action on a tapered hole of a rod body at the lower part, so that the outer thread at the lower end of the rod body is locked with a threaded hole after the self-locking bolt is screwed down and consequently traffic safety by railways is ensured; and since the connecting rod and the spring in the bolt are designed integrally and interact with each other, dropping is prevented.

Description

The self-locking screw that a kind of auto lock loosens

[technical field]

The utility model relates to a kind of self-locking screw, and specifically the utility model relates to the self-locking screw that a kind of auto lock that on high ferro bridge fence or railroad rail backplate steel plate rolling stock alive, uses loosens.

[background technique]

Known; Safety of railway traffic is related to the big problem of national economy; Because the shock-effect in the railway operation, employed various component need pass through that relevant departments carry out a large amount of experiments and through post-installation review, its Security for confirmation, durability and stability; Wherein the use amount of bolt is extremely huge; Commercially available self-locking screw kind is more, mostly through on the outside thread of bolt, locking mechanism being set, also has the spring sheet of use or rubber to form locking " self-locking "; But its using effect is unsatisfactory; Just a lot of self-locking screws receive erosion by wind and rain and vibrations for a long time, and spring sheet just can fatigue occur and lose auto-lock function, especially rubber in case tired or agingly just have no auto-lock function; Auto-lock function forfeiture phenomenon also can appear in the obstruction that the self-locking screw that locking mechanism is set on the outside thread receives rusty stain behind the rain erosion and dust, and can't discover; State Planning Commission's key industry project of arranging for example, by common " China Star " train accomplished of 12 enterprises, scientific research institutions and universities, the main cause that withdraws from railway is in the maintenance, the Ministry of Railways finds the potential safety hazard of certain bolt looseness; And domestic a lot of rolling stock derailment accidents are derived from bolt looseness.

[summary of the invention]

In order to overcome the deficiency in the background technique; The utility model discloses the self-locking screw that a kind of auto lock loosens, the utility model has utilized the hold out against effect of circular cone to bottom body of rod cone shape hole, and the outside thread and the screw that make the utility model tighten body of rod lower end, back are realized locking; Guaranteed railway operation safety; Because connecting rod in the said bolt and spring belong to the one design, and interact, and have taken precautions against the generation that comes off.

In order to realize the purpose of said invention, the utility model adopts following technological scheme:

The self-locking screw that a kind of auto lock loosens; Comprise bolt, connecting rod and spring; Said bolt top is set to screw end, is outside thread screwing end lower pole body outer edge surface, holds upper-end surface to body of rod lower end surface to be provided with upper recess, internal thread and the unthreaded hole of perforation successively by screwing; The upper/lower terminal of said connecting rod is respectively equipped with thread head, circular cone; The diameter of connecting rod is less than thread head, circular cone; Said circular cone is the big cone structure in little bottom, top; Be provided with at least one breathing groove in the bottom of unthreaded hole, said breathing groove outside connects to the outside thread of body of rod outer edge surface; On connecting rod, be with spring; The thread head of small end is arranged in the upper recess after passing the internal thread of screwing end; The upper end of said spring withstands on the step of internal thread bottom unthreaded hole; The lower end of spring withstands on the upper-end surface of circular cone, and circular cone is inserted in the lower end oral area of unthreaded hole, makes said breathing groove increase width by circular cone and forms externally threaded expansion self-locking.

The self-locking screw that described auto lock loosens is provided with the big cone shape hole in little bottom, top in the unthreaded hole bottom, circular cone is inserted in the said cone shape hole.

The self-locking screw that described auto lock loosens is provided with in the bottom surfaces of circular cone and screws groove.

The self-locking screw that described auto lock loosens, the said groove of screwing is cross or yi word pattern or interior six sides or interior four directions.

The self-locking screw that described auto lock loosens, said outer rim of screwing end is a polygon.

The self-locking screw that described auto lock loosens, the said polygon of screwing end comprises hexagon and quadrangle.

Through above-mentioned disclosure, the beneficial effect of the utility model is:

The self-locking screw that the said auto lock of the utility model loosens, the utility model to the holding out against of bottom body of rod cone shape hole, forces the breathing groove of body of rod bottom to broaden through circular cone; Then make outside thread and screw realize locking, wherein said breathing groove be set to three preferable, but preferably be no more than six; Since in unthreaded hole, be provided with spring, also comparatively laborsaving when pulling down, in unthreaded hole, inject machine oil in the use with certain density; Can play rust inhibition, in order to demonstrate the utility model concrete structure, so that connecting rod is drawn in the accompanying drawing is thinner; During actual fabrication, as long as just said connecting rod can through internal thread; The utility model is rational in infrastructure, and locking effect is superior to existing self-locking screw, can guarantee the traffic safety of railway, has taken precautions against the generation of bolt falling phenomenon effectively.

[description of drawings]

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the bolt arrangement schematic representation of the utility model;

Fig. 3 is the spring structure schematic representation of the utility model;

Fig. 4 is the bar linkage structure schematic representation of the utility model;

Fig. 5 is the circular cone polycrystalline substance schematic representation of the utility model;

In the drawings: 1, upper recess; 2, screw end; 3, internal thread; 4, connecting rod; 5, spring; 6, unthreaded hole; 7, outside thread; 8, cone shape hole; 9, breathing groove; 10, circular cone; 11, thread head; 12, screw groove.

[embodiment]

Embodiment with reference to following can explain the utility model in more detail; But the utility model is not limited to these embodiments' compound mode.

The self-locking screw that loosens in conjunction with the auto lock described in accompanying

drawing

1,2 or 3; Comprise bolt, connecting rod 4 and spring 5; Said bolt top is set to hexagon or quadrangle is screwed end 2; Preferred hexagon is screwed end 2, is outside thread 7 screwing end 2 lower pole body outer edge surfaces, holds 2 upper-end surfaces to body of rod lower end surface to be provided with upper recess 1, internal thread 3, unthreaded hole 6 and the cone shape hole 8 of perforation successively by screwing; The upper/lower terminal of said connecting rod 4 is respectively equipped with thread head 11, circular cone 10; The diameter of connecting rod 4 is less than thread head 11, circular cone 10; Said circular cone 10 is the big cone structure in little bottom, top; Be provided with the big cone shape hole 8 in little bottom, top in unthreaded hole 6 bottoms, the bottom of unthreaded hole 6 and cone shape hole 8 are provided with at least one breathing groove 9, and said breathing groove 9 outsides connect to the outside thread 7 of body of rod outer edge surface; On connecting rod 4, be with spring 5; The thread head 11 of connecting rod 4 upper ends is arranged in the upper recess 1 after passing the internal thread 3 of screwing end 2; The upper end of said spring 5 withstands on the step of internal thread 3 bottom unthreaded holes 6; The lower end of spring 5 withstands on the upper-end surface of circular cone 10, and circular cone 10 is inserted in the lower end oral area of said cone shape hole 8, makes said breathing groove 9 increase the expansion self-locking that width forms outside thread 7 by circular cone 10; Wherein be provided with in the bottom surfaces of circular cone 10 and screw groove 12, the said groove 12 of screwing is cross or yi word pattern or interior six sides or interior four directions.

Implement the self-locking screw that the said auto lock of the utility model loosens, the main use has on the link of screw, and end 2 lower external thread 7 length of screwing of the screw degree of depth and the utility model are mated; During use spring 5 is enclosed within on the connecting rod 4; Utilize the groove 12 of screwing of circular cone 10 bottom surfaces to pass through instrument; Make the thread head 11 of connecting rod 4 upper ends be screwed into internal thread 3 backs and get in the upper recess 1 of screwing end 2, the upper end of at this moment said spring 5 withstands on the excessive step of internal thread 3 bottoms and unthreaded hole 6, and the lower end of spring 5 withstands on the upper-end surface of circular cone 10; Then with the corresponding link screw in the hole of fastener; Tighten and screw end 2 and make the said bolt of the utility model bottom and screw bottom begin to feed to cone shape hole 8 near, at this moment said circular cone 10 to make breathing groove 9 become big, said outside thread 7 lower ends begin to expand and screw forms self-locking; The utility model is tightened the back bolt and can not occurred becoming flexible, and only need screw the said end 2 of screwing during maintenance once more and just can; When the utility model need be changed, screw the said end 2 of screwing, the synchronous thread head 11 that knocks, the utility model just can be unloaded down.

The utility model does not detail part and is existing technology.

The embodiment who selects for use in this article for the purpose of open the utility model currently thinks to suit, but will be appreciated that, the utility model is intended to comprise that all belong to the interior embodiment's of this design and the utility model scope all changes and improvement.

Claims

1. self-locking screw that auto lock loosens; Comprise bolt, connecting rod (4) and spring (5); It is characterized in that: said bolt top is set to screw end (2); Screwing end (2) lower pole body outer edge surface is outside thread (7), is provided with upper recess (1), internal thread (3) and the unthreaded hole (6) of perforation successively to body of rod lower end surface by screwing end (2) upper-end surface; The upper/lower terminal of said connecting rod (4) is respectively equipped with thread head (11), circular cone (10); The diameter of connecting rod (4) is less than thread head (11), circular cone (10); Said circular cone (10) is the big cone structure in little bottom, top; Be provided with at least one breathing groove (9) in the bottom of unthreaded hole (6), said breathing groove (9) outside connects to the outside thread (7) of body of rod outer edge surface; On connecting rod (4), be with spring (5); After passing the internal thread (3) of screwing end (2), the thread head (11) of connecting rod (4) upper end is arranged in the upper recess (1); The upper end of said spring (5) withstands on the step of internal thread (3) bottom unthreaded hole (6); The lower end of spring (5) withstands on the upper-end surface of circular cone (10); Circular cone (10) is inserted in the lower end oral area of unthreaded hole (6), makes said breathing groove (9) increase the expansion self-locking that width forms outside thread (7) by circular cone (10).

2. the self-locking screw that auto lock according to claim 1 loosens is characterized in that: be provided with the big cone shape hole in little bottom, top (8) in unthreaded hole (6) bottom, circular cone (10) is inserted in the said cone shape hole (8).

3. the self-locking screw that auto lock according to claim 1 loosens is characterized in that: be provided with in the bottom surfaces of circular cone (10) and screw groove (12).

4. the self-locking screw that auto lock according to claim 3 loosens is characterized in that: the said groove (12) of screwing is cross or yi word pattern or interior six sides or interior four directions.

5. the self-locking screw that auto lock according to claim 1 loosens is characterized in that: said outer rim of screwing end (2) is a polygon.

6. the self-locking screw that auto lock according to claim 5 loosens is characterized in that: the said polygon of screwing end (2) comprises hexagon and quadrangle.