CN201568427U - Anti-looseness sexangular flange bolt - Google Patents

Abstract

An anti-looseness sexangular flange bolt comprises a screw head part, and a rod part vertically arranged in the centre of the head part. Screw threads are formed on the rod part, a rubbing surface matched with a pretension device is arranged at one end of the head part while the other end thereof is provided with a joint surface in contact with a fastened piece, the head part is also provided with a discharge flange which is used for pushing out materials on the fastened piece and embedded in the fastened piece, the discharge flange protrudes out of the joint surface, and the projection of the discharge flange is polygonal on a cross section perpendicular to the axial lead of the rod part. The utility model has the advantages as follows: after being locked tightly, the discharge flange can push out part of material on the surface of the fastened piece to the periphery, and the discharge flange is enabled to be embedded into the surface of the fastened piece. Therefore, the degree of freedom of the bolt in the rotation direction can be eliminated.

Description

Anti-loosening hexagon flange screws

technical field

The utility model belongs to the field of fasteners, in particular to a screw which realizes anti-loosening and anti-rotation after fastening through its own structure.

Background technique

Screws in the prior art, as shown in Figure 1, mostly include a screw head 1 and a threaded shank 2, the surface on the side of the screw head opposite to the fastened part is a smooth joint surface, After the screw is screwed into the fastened part, the joint surface is in contact with the fastened part. The two parts locked by the screw are prone to loosening of the fasteners under the action of vibration and variable load, and the screw generally does not have the functions of locking and anti-loosening, so it is necessary to use gaskets or nuts, etc. The connecting parts are anti-loosening, and because the use of gaskets or nuts is restricted in some occasions, there will be a hidden danger of thread loosening.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings in the prior art and provide a screw that can effectively prevent loosening.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a kind of anti-loosening hexagonal flange screw, which includes a screw head and a stem vertically set up in the center of the head, on which the stem Threads are provided, one end of the head has a friction surface that matches with the pre-tightening device, the other end of the head has a joint surface that is in contact with the fastened member, and the head also has a A discharge flange for expelling material on the fastened part and at least partially embedded in the fastened part, the discharge flange protrudes from the joint surface, perpendicular to the On the cross-section of the axis line of the rod portion, the projection of the discharge flange is a polygon.

Preferably, the projection of the discharge flange is a regular hexagon on a section perpendicular to the axis of the rod.

Compared with the prior art, the utility model has the advantages that: after the self-locking screw is screwed into the fastened part and locked, the discharge flange can discharge part of the material on the surface of the fastened part to the surrounding, The discharge flange can be embedded into the surface of the fastened part, and the discharge flange itself is a non-rotating body, so the degree of freedom of the screw in the direction of rotation can be eliminated, thereby preventing the screw from loosening. Utilizing the utility model for locking can avoid using structures such as anti-loosening gaskets or nuts, thereby reducing the height protruding from the surface of the fastened part, making the appearance of the fastened part more beautiful and the surface smoother.

Description of drawings

Accompanying drawing 1 is the front view of screw in the prior art;

Accompanying drawing 2 is the bottom view of screw in the prior art;

Accompanying drawing 3 is the front view of Embodiment 1 of the utility model;

Accompanying drawing 4 is the bottom view of Embodiment 1 of the utility model;

Accompanying drawing 5 is the front view of Embodiment 2 of the present utility model;

Accompanying drawing 6 is the bottom view of Embodiment 2 of the present utility model;

Among them: 1. Head; 2. Rod; 11. Friction surface; 12. Joint surface; 13. Forming groove; 15. Discharging flange; 16. Convex teeth.

Detailed ways

Accompanying drawing 3 and accompanying drawing 4 show the first embodiment of the present utility model, which discloses a hexagonal flange screw for anti-loosening, including a screw head 1 and a stem vertically set up in the center of the head 1 2.

One end of the head 1 has a friction surface 11 that matches the pre-tensioning device. The pre-tensioning device refers to a screwdriver or an electric screw or a wrench. The other end of the head 1 has a friction surface that is in contact with the fastened member. The joint surface 12. The rod part 2 is provided with threads, and the rod part 2 is provided with a forming groove 13 at a position close to the joint surface 12 .

The head 1 also has a discharge flange 15 , and the discharge flange 15 forms an outwardly protruding boss on the joint surface 12 . After the self-locking screw is screwed into the fastened part and further tightened, the discharge flange 15 will squeeze the surface of the fastened part, displace the material on the fastened part, and finally make it at least Part of it is embedded in the fastened part, and since the projection of the discharge flange 15 is a polygon on the section perpendicular to the axis of the rod 2, self-locking can be eliminated. The degree of freedom of the screw in the direction of rotation plays a very good role in preventing rotation.

Furthermore, the projection of the discharge flange 15 is a regular hexagon.

As a change, sometimes engineers will design the discharge flange 15 as a structure with a plurality of protruding teeth 16 protruding from the joint surface. Above, the plurality of protruding teeth 16 are evenly distributed in the circumferential direction with the axis of the rod 2 as the center, as shown in Figure 5 and Figure 6 . It can also play the role of anti-rotation, but the strength of anti-rotation is small, and for the manufacturing enterprise, because the convex tooth 16 needs to be processed with a mold when the screw is formed, and the life of the mold for processing the convex tooth is short, so this Embodiment is not the best embodiment of the utility model.

The above embodiments are only to illustrate the technical conception and characteristics of the present utility model. Equivalent changes or modifications made to the spirit of the present invention shall fall within the protection scope of the present utility model.

Claims (1)

1. An anti-loosening hexagonal flange screw, comprising a screw head and a stem vertically set up in the center of the head, the stem is provided with threads, and one end of the head has a The friction surface matched with the fastening device, the other end of the head has a joint surface in contact with the fastened piece, and it is characterized in that: the head also has a material for displacing the fastened piece and at least partially embedded in the discharge flange inside the fastened part, the discharge flange protrudes from the joint surface, and on the section perpendicular to the axis line of the rod part , the projection of the discharge flange is a regular hexagon.

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