CN210978125U

CN210978125U - Internal expansion locking bolt

Info

Publication number: CN210978125U
Application number: CN201920420881.0U
Authority: CN
Inventors: 付良启
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-30
Filing date: 2019-03-30
Publication date: 2020-07-10
Anticipated expiration: 2029-03-30

Abstract

The utility model relates to a connecting piece technical field, concretely relates to internal expanding dies check bolt. The utility model discloses a bolt, nut, be equipped with the external screw thread on the bolt, the hole department of nut is equipped with the internal thread, the external screw thread is mutually supported with the internal thread, the screw thread head of bolt is equipped with a plurality of flutings, the inside of the external screw thread end of bolt still is equipped with internal thread and tapering, the internal thread back of bolt still cooperates the inflation screw, be equipped with external screw thread, inflation tapering on the inflation screw, the external screw thread on the inflation screw is mutually supported with the internal thread of bolt. When the expansion screw is screwed down, the head of the external thread of the bolt is expanded, so that the purpose of expanding the bolt and the nut is achieved, and finally loosening is prevented.

Description

Internal expansion locking bolt

Technical Field

The utility model relates to a connecting piece technical field, concretely relates to internal expanding dies check bolt.

Background

At mechanical connection department, need adopt bolt and nut to connect in a large number and need ensure that the fastening is not hard up, and the unable effectual not hard up that prevents between nut and the bolt of ordinary bolt and nut combination, in order to prevent that the nut is not hard up, usually adopt and twist two nuts, or use the locknut who takes rubber, the not hard up of nut has been slowed down to a certain extent to this kind of mode, but in some vibration more frequent or the higher field of locking requirement just can't be satisfied, need artifical the detection and fasten once more for a long time, there is the safety of this huge cost of labor expenditure and some hazardous devices can't obtain effectual guarantee.

Disclosure of Invention

In order to overcome the not enough of background art, the utility model provides a dead check bolt of internal expanding, thereby this dead check bolt of internal expanding makes the screw thread not have not hard up through the thread head inflation of inflation screw messenger its bolt.

The technical scheme of the utility model is that: including bolt, nut, be equipped with first external screw thread on the bolt, the hole department of nut is equipped with first internal thread, first external screw thread and first internal thread cooperate each other, the screw thread head of bolt is equipped with the fluting, the inside of the external screw thread end of bolt still is equipped with second internal thread and tapering, the second internal thread inside of bolt still cooperates there is the inflation screw, be equipped with second external screw thread, inflation tapering on the inflation screw, the second external screw thread on the inflation screw cooperates with the second internal thread of bolt mutually.

Further, the center of the expansion screw is provided with a non-circular hole.

Still further, the non-circular hole of the expansion screw is preferably hexagonal or square.

Still further, the hexagonal hole of the expansion screw is a through hole.

Still further, the second internal thread and the taper adopt an internal taper thread, and the second external thread and the expansion taper adopt an external taper thread.

Still further, the fluting of bolt is 6.

Still further, the area of one end of the nut is larger than that of the other end of the nut.

Still further, the periphery of the nut is provided with an outer hexagon.

The beneficial effects of the utility model are that, owing to adopt the structure that has tapering and take the internal thread, make the external screw thread head inflation of bolt to make the external screw thread of bolt and the internal thread inflation locking of nut, finally reached locking purpose.

Drawings

Fig. 1 is a sectional view of the present invention.

Fig. 2 is an axial view of the present invention.

Fig. 3 is an axial view of the bolt of the present invention.

Fig. 4 is a cross-sectional view of the bolt of the present invention.

Fig. 5 is a cross-sectional view of an example of the expansion screw of the present invention.

Fig. 6 is a cross-sectional view of another example of the expansion screw of the present invention.

FIG. 7 is a top view of another embodiment of the expansion screw of the present invention

Fig. 8 is a schematic structural view of the nut of the present invention.

In fig. 1-8, bolt 1, slot 11, second internal thread 12, taper 13, first external thread 14, nut 2, first internal thread 21, expansion screw 3, second external thread 31, expansion taper 32, non-circular hole 33.

Detailed Description

Embodiments of the invention are further described below with reference to the accompanying drawings:

as shown in fig. 1 to 8, the embodiment provides an internal expansion locking bolt, which includes a bolt 1 and a nut 2, wherein a first external thread 14 is provided on the bolt 1, a first internal thread 21 is provided at an inner hole of the nut 2, the first external thread 14 is matched with the first internal thread 21, a slot 11 is provided at a thread head of the bolt 1, a second internal thread 12 and a taper 13 are further provided inside an external thread end of the bolt 1, an expansion screw 3 is further matched at an inner end of the second internal thread 12 of the bolt 1, a second external thread 31 and an expansion taper 32 are provided on the expansion screw 3, and the second external thread 31 on the expansion screw 3 is matched with the second internal thread 12 of the bolt 1.

When the expansion screw is screwed down, the head of the external thread of the bolt is expanded, so that the purpose of expanding the bolt and the nut is achieved, and finally loosening is prevented.

The center of the expansion screw 3 as mentioned above may be provided with a non-circular hole 33, and the non-circular hole 33 is preferably hexagonal and square, and is convenient to be tightened by a hexagon socket wrench or a square wrench. When the production capacity of part of the anti-loosening bolts is small, the non-circular hole 33 on the expansion screw 3 can be a through hole; if the production of part of the anti-loose bolts is large, the non-circular hole 33 on the expansion screw 3 can directly adopt a non-through hole and an inner hexagon, and the structure is similar to a spanner structure of an inner hexagon bolt, and the structure can adopt a processing technology with extremely low cost in batches such as cold forging and the like.

The other internal expansion locking bolt in the second embodiment comprises a bolt 1 and a nut 2, wherein a first external thread 14 is arranged on the bolt 1, a first internal thread 21 is arranged at an inner hole of the nut 2, the first external thread 14 is matched with the first internal thread 21, a slot 11 is arranged at the thread head of the bolt 1, an internal taper thread is further arranged inside an external thread end of the bolt 1, an expansion screw 3 is further matched at the inner end of the internal taper thread of the bolt 1, an external taper thread is arranged on the expansion screw 3, and the external taper thread on the expansion screw 3 is matched with the internal taper thread of the bolt 1; compared with the first embodiment, the structure is directly simplified by adopting the inner taper threads as the second inner threads 12 and the taper 13 and adopting the outer taper threads as the second outer threads 31 and the expansion taper 32, and the taper threads directly serve as the threaded connection and the outer thread head of the expansion bolt, so that the threads and the nut are locked.

The number of the slots 11 of the bolt 1 can be 2, 3, 4 or more, but from the machining cost and the locking effect of the head of the expanded bolt, the number of the slots 11 of the bolt 1 is preferably 6, and the best balance is achieved in the machining cost and the locking effect.

The area of one end of the nut 2 is larger than that of the other end, and the anti-loosening capacity of the bolt and the nut can be increased to a certain degree by increasing the contact area; the periphery of the nut 2 is provided with an outer hexagon, the outer hexagon on the nut 2 is combined with the large end of the nut 2, and the outer diameter of the outer hexagon on the nut 2 is larger than that of the upper part of the nut 2; of course, in another embodiment, the outer periphery of the nut 2 is provided with an outer hexagon at the upper part of the nut 2, the larger end of the nut 2 is arranged at the lower part of the nut 2, and the outer hexagon of the nut 2 is smaller than the outer diameter of the lower part of the nut 2.

The nut 2 is screwed up in a hexagonal mode, friction is increased in a large area at the bottom, and the anti-loosening effect is improved; the outer hexagon of the nut 2 can also be realized in other modes such as opposite sides and the like; in addition, the nut 2 can also adopt the most common and standard hexagonal nut on the market.

The present embodiment should not be considered as a limitation of the present invention, but any modification made based on the spirit of the present invention should be within the scope of the present invention.

Claims

1. The utility model provides an internal expanding dead check bolt, includes bolt (1), nut (2), be equipped with first external screw thread (14) on bolt (1), the hole department of nut (2) is equipped with first internal thread (21), first external screw thread (14) mutually support its characterized in that with first internal thread (21): the thread head of bolt (1) is equipped with fluting (11), the inside of the external screw thread end of bolt (1) still is equipped with second internal thread (12) and tapering (13), the second internal thread (12) of bolt (1) is the inside still to be cooperated with expansion screw (3), be equipped with second external thread (31), inflation tapering (32) on expansion screw (3), second external thread (31) on expansion screw (3) and second internal thread (12) of bolt (1) are mutually supported.

2. The internal expansion lock bolt according to claim 1, wherein: the center of the expansion screw (3) is provided with a non-circular hole (33).

3. The internal expansion lock bolt according to claim 2, wherein: the non-circular hole (33) of the expansion screw (3) is hexagonal.

4. The internal expansion lock bolt according to claim 3, wherein: the hexagonal hole of the expansion screw (3) is a through hole.

5. The internal expansion lock bolt according to claim 1, wherein: the second internal threads (12) and the taper (13) adopt internal taper threads, and the second external threads (31) and the expansion taper (32) adopt external taper threads.

6. The internal expansion lock bolt according to claim 1, wherein: the number of the slots (11) of the bolt (1) is 6.

7. The internal expansion lock bolt according to claim 1, wherein: the area of one end of the nut (2) is larger than that of the other end.

8. The internal expansion lock bolt according to claim 1, wherein: the periphery of the nut (2) is provided with an outer hexagon.