CN212028274U - Bolt connecting pair - Google Patents
Bolt connecting pair Download PDFInfo
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- CN212028274U CN212028274U CN202020050597.1U CN202020050597U CN212028274U CN 212028274 U CN212028274 U CN 212028274U CN 202020050597 U CN202020050597 U CN 202020050597U CN 212028274 U CN212028274 U CN 212028274U
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Abstract
The utility model provides a bolt connecting pair which is used for fixing at least two connecting pieces and comprises a bolt (1), a first nut (2) and a second nut (3); the bolt (1) is provided with double-helix external threads with different helix angles, the second nut (3) and the first nut (2) are respectively provided with internal threads matched with the external threads with different helix angles, the structure is simple, finish machining is not needed, and the cost is greatly reduced; the first nut (2) and the second nut (3) with different internal threads have different strokes during rotating loosening, and the first nut (2) can prevent the second nut (3) from loosening and has good anti-loosening effect; the utility model provides a vice construction of bolted connection is simple, and application scope is extensive.
Description
Technical Field
The utility model relates to a transmission line technical field, concretely relates to bolted connection is vice.
Background
The bolt connection is one of the most common and simple and effective connection forms in the power transmission iron tower, and has the advantages of simple structure, convenience in disassembly, low cost and the like. The connection rigidity, damping performance and reliability of the bolted connection are of great importance to the safety of the entire structure. When the bolts of the power transmission tower are fastened, torque can be generated in the bolts, and the releasing of the torque can reduce the pretightening force of the bolts; meanwhile, under the condition of dynamic load (wind vibration or galloping) or large temperature difference, the bolt connection is easy to loosen and even fall off. Bolt joint failure is one of the important causes of a collapse accident.
The bolt connection pair in the prior art comprises a bolt, a nut and two washers, which are all produced in the same batch and are products processed in the same heat treatment process. The bolt can be divided into detachable locking and permanent locking according to the locking mode, wherein the permanent locking comprises spot welding, riveting, punching and bonding, and the detachable locking comprises friction locking, mechanical locking and deformed locking. The existing bolt with the anti-loosening effect is complex in structure, needs to be subjected to finish machining and is high in cost.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of complex structure, fine machining and high cost in the prior art, the utility model provides a bolt connecting pair which is used for fixing at least two connecting pieces and comprises a bolt (1), a first nut (2) and a second nut (3); bolt (1) has the double helix external screw thread at different helix angles, second nut (3) and first nut (2) are equipped with respectively with the external screw thread matched with internal thread at different helix angles, simple structure need not finish machining, greatly reduced the cost.
In order to achieve the purpose, the utility model adopts the following scheme:
the utility model provides a bolt connecting pair, which is used for fixing at least two connecting pieces and comprises a bolt (1), a first nut (2) and a second nut (3);
the bolt (1) is provided with double-helix external threads with different helix angles, and the second nut (3) and the first nut (2) are respectively provided with internal threads matched with the external threads with different helix angles.
The nominal diameters of the two external threads are the same, and the diameters of the valley bottoms of the two external threads are the same or different.
The thread directions of the two external threads are the same or different.
The nominal diameter of the internal thread of the second nut (3) is the same as that of the internal thread of the first nut (2), and the valley bottom diameters of the two are the same or different.
The first nut (2) and the second nut (3) are all one of a four-corner locknut, a pentagonal locknut, a hexagonal locknut, a heptagonal locknut or an octagonal locknut.
The head of the bolt (1) adopts one of a four-corner screw head, a pentagonal screw head, a hexagonal screw head, a heptagonal screw head or an octagonal screw head which are matched with the first nut (2) and the second nut (3).
Compared with the closest prior art, the utility model provides a technical scheme has following beneficial effect:
the bolt connecting pair provided by the utility model is used for fixing at least two connecting pieces, and comprises a bolt (1), a first nut (2) and a second nut (3); the bolt (1) is provided with double-helix external threads with different helix angles, the second nut (3) and the first nut (2) are respectively provided with internal threads matched with the external threads with different helix angles, the structure is simple, finish machining is not needed, and the cost is greatly reduced;
the bolt (1) in the utility model is provided with double-helix external threads with different helix angles, the internal thread of the second nut (3) is matched with one of the external threads, the internal thread of the first nut (2) is matched with the other external thread, the first nut (2) and the second nut (3) with different internal threads have different strokes when rotating and loosening, the first nut (2) can prevent the second nut (3) from loosening and loosening, and a good anti-loosening effect is achieved;
the utility model provides a vice construction of bolted connection is simple, and application scope is extensive.
Drawings
FIG. 1 is a diagram of a structure of a bolt connection pair in an embodiment of the present invention;
FIG. 2 is a schematic view of a bolt in an embodiment of the present invention;
FIG. 3 is a detail view of the double helix external thread on the bolt in an embodiment of the present invention;
in the figure, 1, a bolt, 2, a first nut, 3, a second nut, 4, one of the connecting pieces, 5, the other second connecting piece, 6, one of the external threads, 7, the other external thread.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the utility model provides a bolt connection pair, as shown in figure 1, the bolt connection pair is used for at least two connecting pieces, the embodiment of the utility model takes the fixation of two connecting pieces as an example, two connecting pieces are connecting piece 4 and connecting piece 5 in the figure, the bolt connection pair comprises a bolt 1, a first nut 2 and a second nut 3;
as shown in fig. 2, the bolt 1 is provided with double-spiral external threads having different lead angles, the second nut 3 and the first nut 2 are respectively provided with internal threads to be fitted with the external threads having different lead angles, and the second nut 3 and the first nut 2 are sequentially mounted on the bolt 1.
The double-helix external threads with different lead angles include one external thread 6 and the other external thread 7, as shown in fig. 3, α is the lead angle of the external thread 7, β is the lead angle of the external thread 6, and the lead angle of the external thread 6 is smaller than the lead angle of the external thread 7, that is, β < α, and the embodiment is not limited to β < α, β > α and the same applies.
The internal thread of the second nut 3 is matched with the external thread 7, and the lead angles of the two are the same.
The first nut 4 is internally threaded and matched with the external thread 6, and the lead angles of the two are the same.
The nominal diameter of external screw thread 7 is the same with the nominal diameter of external screw thread 6, and the valley bottom diameter of external screw thread 7 is the same or different with the valley bottom diameter of external screw thread 6, and when the valley bottom diameter of external screw thread 7 is different with the valley bottom diameter of external screw thread 6, the valley bottom diameter of external screw thread 7 can be less than the valley bottom diameter of external screw thread 6, also can be bigger than the valley bottom diameter of external screw thread 6.
The thread directions of the external thread 7 and the external thread 6 are the same or different, i.e. the thread directions of the external thread 7 and the external thread 6 can be the same or opposite.
The nominal diameter of the internal thread of the second nut 3 is the same as the nominal diameter of the internal thread of the first nut 2, and the valley bottom diameters of the two are the same or different.
The nominal diameter is the major diameter, and specifically refers to the diameter of an imaginary cylinder or cone tangent to the crest of the external thread or the root of the internal thread; the valley bottom diameter is a small diameter, and specifically refers to the diameter of an imaginary cylinder or cone tangent to the root of the external thread or the crest of the internal thread.
The first nut 2 and the second nut 3 are all one of a four-corner locknut, a pentagonal locknut, a hexagonal locknut, a heptagonal locknut or an octagonal locknut.
The head of the bolt 1 adopts one of a quadrangular screw head, a pentagonal screw head, a hexagonal screw head, a heptagonal screw head or an octagonal screw head which is matched with the first nut 2 and the second nut 3.
The bolt 1, the first nut 2 and the second nut 3 are made of stainless steel, aluminum alloy, low alloy steel or carbon steel.
Use two fixed connecting pieces as the example, introduce the embodiment of the utility model provides a vice mounting method's of bolted connection concrete process:
the connecting piece 4 and the connecting piece 5 are attached in a face-to-face mode, and bolt holes are aligned;
the bolt 1 is inserted through the bolt holes of the connecting piece 4 and the connecting piece 5;
screwing the second nut 3 along the external thread 7 of the bolt 1, and fastening with a wrench:
the first nut 2 is screwed in along the external thread 6 of the bolt 1, is fastened by a wrench, and is screwed with the fastened second nut 3, and the installation is completed.
The same as the example of the screw thread direction of external screw thread 7 and external screw thread 6, the explanation utility model discloses the vice concrete theory of operation of bolted connection that the embodiment provided:
when the connecting piece 4 and the connecting piece 5 vibrate, the second nut 3 directly connected with the connecting pieces tends to loosen and rotate. Meanwhile, the first nut 2 and the second nut 3 are tightly connected, and the tendency of loosening and rotating occurs at the same time. Because the lead angle of the second nut 3 is large, the loosening process is fast, the lead angle of the first nut 2 is small, and the loosening process is slow, the loosening of the second nut 3 is prevented at the outer side, and the anti-loosening effect is achieved.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and those skilled in the art can still modify or substitute the specific embodiments of the present invention with reference to the above embodiments, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are all within the scope of the claims of the present invention pending.
Claims (5)
1. A bolt connection pair is characterized in that the bolt connection pair is used for fixing at least two connecting pieces and comprises a bolt (1), a first nut (2) and a second nut (3);
the bolt (1) is provided with double-helix external threads with different helix angles, and the second nut (3) and the first nut (2) are respectively provided with internal threads matched with the external threads with different helix angles.
2. The screw connection pair of claim 1, wherein the nominal diameters of the two external threads are the same, and the valley diameters of the two external threads are the same or different.
3. The screw connection pair according to claim 1, wherein the thread directions of the two external threads are the same or different.
4. The screw connection according to claim 1, wherein the internal thread of the second nut (3) and the internal thread of the first nut (2) have the same nominal diameter and the same or different valley diameters.
5. The bolt connection pair according to claim 1, wherein the first nut (2) and the second nut (3) are both one of a four-corner locknut, a five-corner locknut, a hexagonal locknut, a seven-corner locknut or an octagonal locknut;
the head of the bolt (1) adopts one of a four-corner screw head, a pentagonal screw head, a hexagonal screw head, a heptagonal screw head or an octagonal screw head which are matched with the first nut (2) and the second nut (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020050597.1U CN212028274U (en) | 2020-01-10 | 2020-01-10 | Bolt connecting pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020050597.1U CN212028274U (en) | 2020-01-10 | 2020-01-10 | Bolt connecting pair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212028274U true CN212028274U (en) | 2020-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020050597.1U Active CN212028274U (en) | 2020-01-10 | 2020-01-10 | Bolt connecting pair |
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| Country | Link |
|---|---|
| CN (1) | CN212028274U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700728A (en) * | 2021-05-25 | 2021-11-26 | 北京工业大学 | Detachable double-thread clamping type locknut |
-
2020
- 2020-01-10 CN CN202020050597.1U patent/CN212028274U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700728A (en) * | 2021-05-25 | 2021-11-26 | 北京工业大学 | Detachable double-thread clamping type locknut |
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