CN214578229U

CN214578229U - Threaded connection assembly

Info

Publication number: CN214578229U
Application number: CN202120258861.5U
Authority: CN
Inventors: 程庆阳; 蔡云龙; 梁伟林; 董兆宇
Original assignee: Shaanxi Zhongke Qihang Technology Co ltd
Current assignee: Xi'an Zhongke Saq Test & Control Technology Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-11-02
Anticipated expiration: 2031-01-29

Abstract

The utility model provides a threaded connection subassembly is at least including the shank of bolt that is provided with the external screw thread to and be provided with the standard appearance nut or the thickening nut in shank of bolt matched with internal thread hole or by the connecting piece, the nut or by the interior disc of connecting piece be provided with from the top tapered surface of diameter crescent, be provided with the internal thread on the tapered surface, the angle between two internal thread root connecting wires on the longitudinal section of tapered surface is the cone angle, the value scope of cone angle is 0.01 ~ 4. The utility model provides a cone angle scope is unified, application scope is wide and can optimize screw thread atress, mass production and the threaded connection subassembly of standardized application.

Description

Threaded connection assembly

Technical Field

The utility model relates to a bolted connection's field specifically is a threaded connection subassembly that can optimize screw thread atress.

Background

The bolt connection is an important way for realizing the connection of industrial equipment and structural components, and is widely applied to the fields of various industrial equipment, buildings, rail transit and the like. The bolt connection is simple to assemble and convenient to disassemble. High efficiency and low cost, but there are also areas where improvements are needed. The most important function of bolt connection is to transmit load through threads, the threaded connection assembly is subjected to various alternating loads and impact loads during work, threads are likely to generate severe plastic deformation, the severe plastic deformation of the bolts is closely related to the matching mode of the bolts and nuts and the thread stress mode besides the load, and the bolt connection can effectively improve the matching mode and the stress mode, so that the service life of the bolts is prolonged, and the reliability of bolt connection is improved.

In the prior art, the bolt connection in use mainly has the following two defects: 1. at present, most of the industry adopts a connection mode of a nut and a bolt rod with uniform standard threads, however, in the engagement of the existing standard bolt and the standard nut, the stress borne by the root parts of the first threads (such as the 1 st thread, the 2 nd thread and the 3 rd thread) of the thread engagement is much larger than the stress borne by the later threads, and the stress borne by each thread is larger, so that the first threads are easy to generate severe plastic deformation. 2. In the industry, a small part of connection modes of tapered bolts are adopted, but due to the reasons of different taper angles, different thicknesses of connected parts and the like, calculation and customization are needed in the process, and the problems of limited use places and high error rate exist in actual use, so that batch production and standardized application cannot be realized.

Disclosure of Invention

The utility model provides a cone angle scope is unified, application scope is wide and can optimize screw thread atress, mass production and the threaded connection subassembly of standardized application.

Realize the utility model discloses the technical scheme that above-mentioned purpose adopted does:

a threaded connection assembly at least comprises a bolt rod provided with external threads, and a standard-appearance nut or a thickened nut or a connected piece provided with an internal thread hole matched with the bolt rod;

the number of the threads of the internal thread in the standard-appearance nut is N, the lower end of the nut in the standard-appearance nut is a bolt rod screwing-in end, the diameter of an inner circular surface where the internal thread in the standard-appearance nut is located is a conical curved surface gradually increasing from top to bottom, wherein the angle between two internal thread root connecting lines on the longitudinal section of the conical curved surface is a cone angle, and the value range of the cone angle is 0.01-4 degrees;

the number of the threads of the internal thread in the thickened nut is (N +2) to (N +10), the inner circle surface where the internal thread in the thickened nut is located is a conical curved surface which is the same as the interior of the nut with the standard appearance, or the inner circle surface where (N-3) to (N +3) threads from bottom to top in the thickened nut is a conical curved surface which is the same as the interior of the nut with the standard appearance, the inner circle surface where the rest threads are located is a cylindrical surface, and the diameter of the cylindrical surface is consistent with the diameter of the top of the conical curved surface;

when the number of the threads of the internal thread in the connected piece is less than or equal to N, the structure of the internal thread hole in the connected piece is the same as that of the standard appearance nut; when the number of the threads of the internal thread in the connected piece is larger than N, the structure of the internal thread hole in the connected piece is consistent with that of the thickened nut.

The value of the cone angle is preferably 0.4 °.

And the standard appearance nut, the thickened nut and the threaded hole in the connected piece are all provided with mark symbols at the opening part where the bolt rod is screwed in.

Compared with the prior art, the beneficial effects of the utility model are that: 1. the utility model provides a threaded connection subassembly is provided with the toper curved surface through the disc in the nut or by the connecting piece for when being located the internal thread on the toper curved surface and the threaded engagement on the shank of bolt, optimized the nut or by the screw thread atress of the first few teeth of connecting piece, reduce the possibility that takes place plastic deformation, prolonged threaded connection subassembly's life, improved bolted connection's reliability. 2. The utility model provides a threaded connection subassembly through the internal thread setting that will have unified cone angle on the nut or by the connecting piece, requires lowerly to the shank of bolt with it meshing to improved coupling assembling's adaptation degree and can reach mass production, the effect of standardized application.

Drawings

Fig. 1 is a schematic structural view of a standard profile nut of a threaded connection assembly provided in example 1;

FIG. 2 is a cross-sectional view of FIG. 1;

fig. 3 is an engagement sectional view of the threaded connection assembly provided in example 1;

fig. 4 is a first schematic structural diagram of a thickened nut of the threaded connection assembly provided in embodiment 2;

FIG. 5 is a cross-sectional view of FIG. 4;

fig. 6 is a second schematic structural view of a thickened nut of the threaded connection assembly provided in embodiment 2;

FIG. 7 is a cross-sectional view of FIG. 6;

fig. 8 is a first sectional view of a connected member of the threaded connection assembly provided in example 3;

fig. 9 is a second sectional view of the connected member of the threaded connection assembly provided in example 3;

fig. 10 is a third sectional view of the connected member of the threaded connection assembly provided in embodiment 3;

in the figure: 1-standard profile nut; 2-bolt shank; 3-internal thread; 4-thickening the nut; 5-connected piece.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The utility model provides a threaded connection subassembly is including the shank of bolt 2 that is provided with the external screw thread to and be provided with the standard appearance nut 1 or the thickening nut 4 in shank of bolt matched with internal thread hole or by connecting piece 5. The bolt rod is a bolt rod with standard length and standard diameter, the bolt rod can be a standard bolt rod without taper, such as a hexagonal-head bolt rod, a hexagon socket-head bolt rod or a stud bolt, and the thread of the bolt rod can be full thread, half thread or partial thread.

Example 1

In the embodiment, a nut in the threaded connection assembly is a standard-appearance nut 1, the standard-appearance nut has a standard appearance and a standard thickness, and is structurally shown in fig. 1 and fig. 2, a conical curved surface is arranged on the inner circular surface of the standard-appearance nut, an internal thread 3 is arranged on the conical curved surface, N is the number of threads of the internal thread in the standard-appearance nut, an angle between two internal thread root connecting lines on the longitudinal section of the conical curved surface is a cone angle, and the value range of the cone angle is 0.01-4 degrees;

when the taper angle beta is 0.4 degrees, the section view of the meshing of the standard outline nut and the bolt rod is shown in fig. 3, the bolt rod is screwed in and tightened from one end of the standard outline nut with a mark, and after the bolt rod is tightened and applied to a set pretightening force, the stress of the 2-3 threads which are meshed firstly does not have the problem of overlarge stress.

Example 2

Nut among the threaded connection subassembly is thickening nut 4 in this embodiment, and thickening nut has standard appearance and has increased X threads in the thread quantity of standard appearance nut, and X's value range is 2 ~ 10, and its structure chart is as shown in fig. 4 to 7. The thread distribution of the internal thread of the thickened nut is divided into the following two types:

(1) the inner circular surface of the thickened nut is a conical curved surface, the (N + X) threads are uniformly distributed on the conical curved surface, and the value range of the cone angle beta is 0.01-4 degrees;

when X is 3, N is 7, and the taper angle β is 0.4 °, the structure is as shown in fig. 4 and 5, the bolt shank is screwed in and tightened from the end of the thickened nut with the mark, and after the nut is tightened to a set pre-tightening force, the stress of the 2-3 threads engaged first does not have the problem of being stressed too much.

(2) The upper end of the inner circular surface of the thickened nut is a cylindrical surface, the lower end of the inner circular surface of the thickened nut is a conical curved surface, the cylindrical surface is not provided with a cone angle and is provided with internal threads, wherein the number of threads distributed on the conical curved surface from bottom to top is (N-3) - (N +3), the rest threads are distributed on the cylindrical surface, and the value range of the cone angle beta is 0.01-4 degrees;

when N is 7, the number of the threads distributed on the conical curved surface is 4-10, namely when X is 3, N is 7 and the cone angle beta is 0.4 degrees, the number of the threads distributed on the cylindrical surface is 3 when the number of the threads distributed on the conical curved surface from bottom to top is 7, the structure of the bolt is shown in figures 6 and 7, the bolt rod is screwed in and tightened from one end, with a mark, of the thickening nut, and after the nut is tightened to a set pre-tightening force, the stress of 2-3 threads meshed firstly does not have the problem of overlarge stress.

Example 3

In the present embodiment, the connected member 5 in the screw connection assembly is provided with an internal thread hole matched with the bolt shank, the cross-sectional view of which is shown in fig. 8 to 10, and the thread distribution of the internal thread hole is divided into the following three cases according to the number of threads:

(1) when the number of the threads of the internal thread in the connected piece is less than or equal to N, all the threads are uniformly distributed on the conical curved surface, and the value range of the cone angle beta is 0.01-4 degrees;

when the taper angle beta is 0.4 degrees, the sectional view is shown in fig. 8, the bolt rod is screwed in and tightened from one end of the connected piece with the mark, and after the preset pretightening force is applied through tightening, the stress of the 2-3 threads which are engaged firstly does not have the problem of overlarge stress.

(2) When the number of the threads of the internal thread in the connected piece is larger than N, all the threads are uniformly distributed on the conical curved surface, and the value range of the taper angle beta is 0.01-4 degrees;

when the taper angle beta is 0.4 degrees, the sectional view is shown in fig. 9, the bolt rod is screwed in and tightened from one end of the connected piece with the mark, and after the preset pretightening force is applied through the screwing, the stress of the 2-3 threads which are engaged firstly does not have the problem of overlarge stress.

(3) When the number of the threads of the internal thread in the connected piece is larger than N, the number of the exceeded threads is Q, the inner circular surface is provided with a cylindrical surface and a conical curved surface, the number of the threads on the conical curved surface ranges from (N-3) to (N +3), the value range of the conical angle beta is 0.01-4 degrees, and the rest threads are distributed on the cylindrical surface;

when N equals 7, then the value range of the number of threads of distributing on the toper curved surface is 4 ~ 10, promptly when Q equals 5, cone angle beta equals 0.4, when the number of threads on the toper curved surface is 7, then the number of threads of distributing on the face of cylinder is 5, as shown in fig. 10, the bolt pole is screwed in and is screwed up from the one end that has the mark on the connected piece, through screwing up and applying to the back of settlement pretightning force, the stress of the 2 ~ 3 threads of meshing first does not have the too big problem of atress.

The utility model provides a threaded connection assembly, set up the toper curved surface that the cone angle value range is 0.01 ~ 4 in the nut or by the interior disc of connecting piece, and evenly distributed has the internal thread on the toper curved surface, and the setting of cooperation face of cylinder simultaneously can be the biggest optimization screw thread atress, reduces the possibility that takes place plastic deformation, has prolonged threaded connection assembly's life; secondly, the number of the threads distributed on the nut or the connected piece by the internal thread is adjustable, so that the application range of the bolt rod is improved, the adaptability of the connecting component is improved, and the effects of batch production and standardized application can be achieved; meanwhile, the cone angle is uniform, so that the installation, the disassembly and the production are facilitated.

Claims

1. The utility model provides a threaded connection subassembly, is at least including the shank of bolt that is provided with the external screw thread to and be provided with the standard appearance nut or the thickening nut or by the connecting piece with shank of bolt matched with internal thread hole, its characterized in that:

the number of the threads of the internal thread in the standard-appearance nut is N, the lower end of the standard-appearance nut is a bolt rod screwing-in end, the diameter of an inner circular surface where the internal thread in the standard-appearance nut is located is a conical curved surface gradually increasing from top to bottom, wherein the angle between two internal thread root connecting lines on the longitudinal section of the conical curved surface is a cone angle, and the value range of the cone angle is 0.01-4 degrees;

the number of the threads of the internal thread in the thickened nut is N + 2-N +10, the inner circular surface where the internal thread in the thickened nut is located is a conical curved surface which is the same as that of a standard thread, or the inner circular surface where N-3-N +3 threads from bottom to top are located in the thickened nut is a conical curved surface which is the same as that of the interior of a standard-appearance nut, the inner circular surface where the rest threads are located is a cylindrical surface, and the diameter of the cylindrical surface is the same as that of the top of the conical curved surface;

2. A threaded connection assembly according to claim 1, wherein: the cone angle is 0.4 °.

3. A threaded connection assembly according to claim 1, wherein: and the standard appearance nut, the thickened nut and the threaded hole in the connected piece are all provided with mark symbols at the opening part where the bolt rod is screwed in.