CN217976950U

CN217976950U - Bolt

Info

Publication number: CN217976950U
Application number: CN202221082164.XU
Authority: CN
Inventors: 屠马军
Original assignee: Haiyan Huilian General Fitting Co ltd
Current assignee: Haiyan Huilian General Fitting Co ltd
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2022-12-06
Anticipated expiration: 2032-05-07

Abstract

The utility model discloses a bolt, including nut, screw rod, the terminal surface is equipped with coaxial screw rod under the nut. Screw rod (2) contain first round bar (21), first round platform (22), second round bar (23), external screw thread (231), second round platform (24), terminal surface under nut (1) is vertically established in first round bar (21), and terminal surface is equipped with coaxial first round platform (22) under first round bar (21), and terminal surface is equipped with coaxial second round bar (23) under first round platform (22), and second round bar (23) lateral wall is equipped with external screw thread (231), and terminal surface is equipped with coaxial second round platform (24) under second round bar (23). The utility model discloses can make its threaded connection department screw-thread fit closely, difficult not hard up, and then make the difficult not hard up of bolt, the bolt installation firm.

Description

Bolt

[ technical field ] A method for producing a semiconductor device

The utility model relates to a technical field of bolt, especially a technical field of bolt.

[ background ] A method for producing a semiconductor device

The bolt is a fastener consisting of a head part and a screw rod (a cylinder with external threads), needs to be matched with a nut for use, is used for fastening and connecting two parts with through holes, and is an anchoring assembly for anchoring a connected piece to a hardened concrete substrate. The existing bolt is not tightly connected with threads and is easy to loosen.

[ Utility model ] content

The utility model aims at solving the problem in the prior art and providing a bolt, which can lead the threaded connection to be tight and not easy to loosen.

In order to achieve the above object, the utility model provides a bolt, including nut, screw rod, the terminal surface is equipped with coaxial screw rod under the nut.

Preferably, the screw rod comprises a first round rod, a first round platform, a second round rod, external threads and a second round platform, the first round rod is vertically arranged on the lower end face of the nut, the lower end face of the first round rod is provided with the coaxial first round platform, the lower end face of the first round platform is provided with the coaxial second round rod, the external threads are arranged on the outer side wall of the second round rod, and the lower end face of the second round rod is provided with the coaxial second round platform.

Preferably, the outer side wall of the first round rod is provided with a plurality of strips which are axially arranged.

Preferably, the large-diameter end of the first round table is connected with the first round rod in a fitting mode.

Preferably, the difference between the major diameter and the minor diameter of the external thread is 3.14 +/-0.5 mm, the thread pitch of the external thread is 3.0 +/-0.5 mm, the external thread is trapezoidal thread, the thread form angle of the external thread is 30 degrees, the chamfer angle and the chamfer radius between the thread bottom of the external thread and the outer side wall of the second round rod are 0.65mm, and the chamfer angle and the chamfer radius between the thread crest of the external thread and the inclined planes at the two sides of the thread crest are 0.75mm.

Preferably, the large-diameter end of the second round table is connected with the second round rod in a suitable mode.

The utility model has the advantages that: the utility model can lead the screw thread at the screw thread joint to be tightly matched and not easy to loosen, thereby leading the bolt not to be easy to loosen and the bolt to be firmly installed; first round bar lateral wall is equipped with a plurality of that the axial set up rectangular, and rectangular can strengthen the frictional force between first round bar and the mounting hole, makes the difficult rotation after the bolt installation is accomplished.

The features and advantages of the present invention will be described in detail by embodiments with reference to the accompanying drawings.

[ description of the drawings ]

Fig. 1 is a front view of the bolt of the present invention.

[ detailed description ] embodiments

Referring to fig. 1, the utility model relates to a bolt, including nut 1, screw rod 2, the terminal surface is equipped with coaxial screw rod 2 under the nut 1.

Wherein, screw rod 2 contains first round bar 21, first round platform 22, second round bar 23, external screw thread 231, second round platform 24, first round bar 21 is vertical to be established terminal surface under nut 1, and first round bar 21 lower terminal surface is equipped with coaxial first round platform 22, and first round platform 22 lower terminal surface is equipped with coaxial second round bar 23, and second round bar 23 lateral wall is equipped with external screw thread 231, and second round bar 23 lower terminal surface is equipped with coaxial second round platform 24.

Wherein, the lateral wall of the first round bar 21 is provided with a plurality of strips 211 arranged axially.

Wherein, the major diameter end of the first round platform 22 is connected with the first round rod 21 in an adapting way.

Wherein, the big footpath of external screw thread 231, the difference of path are 3.14 0.5mm, and the pitch of external screw thread 231 is 3.0 0 0.5mm, and external screw thread 231 is trapezoidal thread, and the profile angle of external screw thread 231 is 30 degrees, and fillet and chamfer radius are 0.65mm between external screw thread 231 tooth bottom and the 23 lateral walls of second round bar, and fillet and chamfer radius are 0.75mm between the inclined plane of external screw thread 231 crest and crest both sides.

Wherein, the large diameter end of the second round platform 24 is adaptively connected with the second round rod 23.

The utility model discloses the working process:

the utility model can lead the screw thread at the screw thread connection part to be tightly matched and not easy to loose in the working process of the bolt, thereby leading the bolt not to be easily loosened and leading the bolt to be firmly installed; first round bar 21 lateral wall is equipped with the rectangular 211 of a plurality of axial setting, and rectangular 211 can strengthen the frictional force between first round bar 21 and the mounting hole, makes difficult the rotation after the bolt installation is accomplished.

The above-mentioned embodiment is right the utility model discloses an explanation, it is not right the utility model discloses a limited, any right the scheme after the simple transform of the utility model all belongs to the protection scope of the utility model.

Claims

1. A bolt, characterized in that: including nut (1), screw rod (2), the terminal surface is equipped with coaxial screw rod (2) under nut (1), screw rod (2) contain first round bar (21), first round platform (22), second round bar (23), external screw thread (231), second round platform (24), terminal surface under nut (1) is vertically established in first round bar (21), and the terminal surface is equipped with coaxial first round platform (22) under first round bar (21), and the terminal surface is equipped with coaxial second round bar (23) under first round platform (22), and second round bar (23) lateral wall is equipped with external screw thread (231), and the terminal surface is equipped with coaxial second round platform (24) under second round bar (23).

2. A bolt as defined in claim 1, wherein: the outer side wall of the first round rod (21) is provided with a plurality of strips (211) which are axially arranged.

3. A bolt as defined in claim 1, wherein: the large-diameter end of the first round platform (22) is connected with the first round rod (21) in a adapting mode.

4. A bolt as defined in claim 1, wherein: the big footpath of external screw thread (231), the difference of path are 3.14 0.5mm, and the pitch of external screw thread (231) is 3.0 0 0.5mm, and external screw thread (231) are trapezoidal thread, and the profile angle of external screw thread (231) is 30 degrees, and fillet and chamfer radius are 0.65mm between external screw thread (231) tooth bottom and second round bar (23) lateral wall, and fillet and chamfer radius are 0.75mm between the inclined plane of external screw thread (231) crest and crest both sides.

5. A bolt as defined in claim 1, wherein: the large-diameter end of the second round platform (24) is adaptively connected with the second round rod (23).