CN209818480U - High-strength arc threaded connection pair - Google Patents
High-strength arc threaded connection pair Download PDFInfo
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- CN209818480U CN209818480U CN201920598653.2U CN201920598653U CN209818480U CN 209818480 U CN209818480 U CN 209818480U CN 201920598653 U CN201920598653 U CN 201920598653U CN 209818480 U CN209818480 U CN 209818480U
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Abstract
The utility model discloses a high-strength circular arc threaded connection pair, wherein the bolt and the nut are provided with an inner circular arc thread and an outer circular arc thread which are mutually matched, the inner circular arc thread and the outer circular arc thread are face-contacted connecting threads, the continuous circular arc thread on the bolt is an external thread and is formed by sequentially connecting an upper crest circular arc, a straight line section, a lower root circular arc and a straight line section, the radius of the upper crest circular arc is equal to that of the lower root circular arc, and the straight line section is respectively tangent to the upper crest circular arc and the lower root circular arc; the continuous circular arc thread on the nut is an internal thread and is formed by sequentially connecting an upper semicircular arc, a tangential straight-line segment and a crest, the crest is a plane, and the tangential straight-line segment is tangent to the upper semicircular arc. The utility model discloses an arc threaded connection is vice to adopt circular arc screw thread profile of tooth, and the internal thread is the face contact with the external screw thread, and the atress is even, can reduce the stress concentration when the screw thread bears effectively, and fatigue resistance can be good.
Description
Technical Field
The utility model belongs to the technical field of wind power generation group pylon bolted connection, crab-bolt are connected, concretely relates to high strength circular arc threaded connection is vice.
Background
The thread connection is a common mechanical connection mode, has the advantages of simple structure, reliable connection, convenient assembly and disassembly and the like, and the thread tooth form of the existing thread can be divided into triangular threads, zigzag threads, trapezoidal threads, pipe threads and the like. The technical requirements and the dimensional specifications of the high-strength anchor bolt connecting pair for the M20-M64 steel structure are specified in the high-strength anchor bolt connecting pair for the steel structure (GB/T33943-2017), and common metric threads, namely triangular threads, are adopted. The technical requirements for mounting the threaded connection pair of the M6-M64 bolt, the screw, the stud and the nut in the wind power generation set are specified in the technical requirements for mounting the high-strength threaded connection pair of the wind power generation set (GB/T33628 and 2017), and common-purpose common meter-made threads are also adopted. Under general conditions, the precision of screw thread fit is 6g/6H, and in the actual use process, the screw thread once appears colliding with, will influence the vice torque coefficient of normal threaded connection and normal installation and use. The common meter-made thread is usually processed by rolling, the requirement on the dimensional tolerance of the material is high, the processing difficulty is increased, and the requirement on the mounting precision of a thread mounting pair is high after subsequent surface anticorrosion treatment. According to the existing common-use metric thread tooth type, the connection between a bolt and a nut and between an anchor bolt and the nut is not smooth enough, the stress concentration phenomenon is easy to generate, the bolt is easy to break or loosen under the action of high-frequency reciprocating dynamic loads of a wind generating set in a normal working state and the like, once the bolt fails, manual maintenance is difficult to find in time, and certain engineering hidden dangers exist.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a high strength circular arc threaded connection is vice can effectively reduce stress concentration, reduces the screw thread roll extrusion processing degree of difficulty.
The purpose of the utility model is realized with the following mode:
a high-strength circular arc threaded connection pair comprises a bolt and a nut, wherein inner and outer circular arc threads which are matched with each other are arranged on the bolt and the nut, the inner and outer circular arc threads are face-contact connecting threads, continuous circular arc threads on the bolt are external threads and are formed by sequentially connecting an upper crest circular arc, a straight line segment, a lower root circular arc and a straight line segment, the radius of the upper crest circular arc is equal to that of the lower root circular arc, and the straight line segment is respectively tangent to the upper crest circular arc and the lower root circular arc; the continuous circular arc thread on the nut is an internal thread and is formed by sequentially connecting an upper semicircular arc, a tangential straight line segment and a crest, the crest is a plane, the tangential straight line segment is tangent to the upper semicircular arc, and the height of the nut is at least 7.5 times of the thread pitch; the thread connection pair is non-equal in width tooth thickness, the external thread tooth thickness is larger than the internal thread tooth thickness, and the external thread tooth form angle is equal to the internal thread tooth form angle.
The stress sectional area of the threaded connection pair is 1120mm2The thread pitch is 6.35mm, the major diameter of the external thread is 41.5mm, the minor diameter of the external thread is 39mm, the minor diameter of the external thread is 36.5mm, the height of the external thread is 2.5mm, the arc radius of the upper crest is 1.5mm, the arc radius of the lower root is 1.5mm, the minor diameter of the internal thread is 37.5mm, and the height of the internal thread is 2.2 mm; the diagonal distance of the nut is 74mm, the opposite side distance of the nut is 65mm, the height of the nut is 48mm, and the thread angle of the external thread and the thread angle of the internal thread are both 60 degrees.
The stress sectional area of the threaded connection pair is 1474mm2The thread pitch is 8.5mm, and the major diameter of the external thread is 483mm, the pitch diameter of the external thread is 45mm, the small diameter of the external thread is 41.7mm, the tooth height of the external thread is 3.3mm, the arc radius of the upper crest is 2.0mm, the arc radius of the lower root is 2.0mm, the small diameter of the internal thread is 43.5mm, and the tooth height of the internal thread is 2.8 mm; the diagonal distance of the nut is 80mm, the opposite side distance of the nut is 70mm, the height of the nut is 64mm, and the thread angle of the external thread and the thread angle of the internal thread are both 60 degrees.
The external thread on the bolt is processed by adopting an axial rolling processing method, and the external thread is processed after the blank is subjected to heat treatment.
The internal thread on the nut is formed by adopting tap tapping or forming cutter processing, and heat treatment is carried out after the internal thread processing is finished.
The strength grade of the bolt is 8.8 grade or 10.9 grade, and the strength grade of the nut is 8 grade or 10 grade.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses an arc threaded connection is vice to adopt circular arc screw thread profile of tooth, and the internal thread is the face contact with the external screw thread, and the atress is even, can reduce the stress concentration when the screw thread bears effectively, and fatigue resistance can be good.
(2) The utility model discloses an arc threaded connection is vice for not aequilate tooth thickness, and axial fit clearance is big, and size strong adaptability easily installs on the scene.
(3) The utility model discloses a cooperation of circular arc internal thread and external screw thread is more and more inseparable along with the work of connected equipment, prevents to become flexible effectively.
(4) The utility model discloses an arc screw thread adopts coarse pitch arc screw thread, effectively avoids the damage phenomenon that the screw thread in installation, the use collided with and causes.
(5) The utility model discloses an arc screw thread external screw thread crest is circular-arc, during the roll extrusion screw thread, and metal plastic deformation is regional little, and the rolling force is little, and the roll extrusion mold life-span is high, greatly reduced the roll extrusion manufacturing degree of difficulty.
(6) The utility model discloses an arc external screw thread adopts roll extrusion processing, does not get rid of the material, and material utilization is high, and the processing degree of difficulty is low.
(7) The utility model discloses an arc internal thread adopts the first processing screw thread reheat treatment, and the processing degree of difficulty is low, and machining efficiency is high, and the heat treatment warp for a short time after the screw thread processing, and does not influence screw-thread fit.
Drawings
FIG. 1 is a schematic structural view of a circular arc threaded connection pair of the present invention;
FIG. 2 is a schematic view of the middle arc threaded connection pair of the present invention;
FIG. 3 is a schematic structural view of a middle arc thread external thread of the present invention;
FIG. 4 is a schematic structural view of a middle arc thread of the present invention;
FIG. 5 is a schematic diagram of the dimensions of the middle arc thread external thread of the present invention;
FIG. 6 is a schematic diagram of the dimensions of the internal thread of the middle arc thread of the present invention;
fig. 7 is a dimension schematic diagram of a front view of the nut of the present invention;
fig. 8 is a schematic size diagram of a side view of the nut of the present invention;
wherein 1 is a bolt; 2 is a nut; 3 is an upper crest arc; 4 is a straight line segment; 5 is a lower root arc; 6 is the upper half arc; 7 is a tangential straight line segment; 8 is the crest.
Detailed Description
The following detailed description of the invention will be further described with reference to the accompanying drawings.
In the attached drawings, d is the major diameter of the external thread and d2Is the pitch diameter and d of the external thread3Is a minor diameter of external thread R1Is the radius of the arc of the upper crest, R2Is the radius of the arc of the lower root, P is the pitch, theta1Is an external thread tooth form angle H1Is the height of teeth D1Is a minor diameter of the internal thread D2The pitch diameter of the internal thread, D the major diameter of the internal thread, R3Is the radius of the upper half arc, H2Is the height of teeth, theta2Is the internal thread profile angle, s1Is the tooth thickness of the external thread, s2The tooth thickness of the internal thread, m the height of the nut, e the length of the opposite angle and s the length of the opposite edge.
As shown in the attached figures 1-8, a high-strength circular arc threaded connection pair comprises a bolt 1 and a nut 2, wherein the bolt 1 and the nut 2 are provided with inner circular arc threads and outer circular arc threads which are matched with each other, the inner circular arc threads and the outer circular arc threads are connecting threads in surface contact, continuous circular arc threads on the bolt 1 are external threads and are formed by sequentially connecting an upper crest circular arc 3, a straight line segment 4, a lower root circular arc 5 and a straight line segment 4, the radius of the upper crest circular arc 3 is equal to that of the lower root circular arc 5, and the straight line segment 4 is respectively tangent to the upper crest circular arc 3 and the lower root circular arc 5; the continuous circular arc thread on the nut 2 is an internal thread and is formed by sequentially connecting an upper semi-circular arc 6, a tangential straight line segment 7 and a crest 8, the crest 8 is a plane, the tangential straight line segment 7 is tangent to the upper semi-circular arc 6, and the height of the nut 2 is at least 7.5 times of the thread pitch; the thread connection pair is non-equal in width tooth thickness, the external thread tooth thickness is larger than the internal thread tooth thickness, and the external thread tooth form angle is equal to the internal thread tooth form angle.
Stress cross-sectional area A of threaded connection pairsIs 1120mm2The pitch P is 6.35mm, the major diameter d of the external thread is 41.5mm, and the intermediate diameter d of the external thread239mm, minor diameter d of external thread3Is 36.5mm, and the height of the external thread is h12.5mm, upper crest arc radius R1Is 1.5mm, and the radius of the circular arc of the lower tooth bottom R21.5mm, small diameter D of internal thread1Is 37.5mm, and the height of the internal thread is H2Is 2.2 mm; the diagonal distance e of the nut is 74mm, the opposite-side distance s of the nut is 65mm, the height m of the nut is 48mm, and the thread form angle theta of the external thread1And internal thread profile angle theta2Are all 60 degrees.
The stress sectional area of the threaded connection pair is 1474mm2The thread pitch is 8.5mm, the major diameter of the external thread is 48.3mm, the pitch diameter of the external thread is 45mm, the minor diameter of the external thread is 41.7mm, the height of the external thread is 3.3mm, the arc radius of the upper crest is 2.0mm, the arc radius of the lower root is 2.0mm, the minor diameter of the internal thread is 43.5mm, and the height of the internal thread is 2.8 mm; the diagonal distance of the nut is 80mm, the opposite side distance of the nut is 70mm, the height of the nut is 64mm, and the thread form angle theta of the external thread1And internal thread profile angle theta2Are all 60 degrees.
The external thread on the bolt 1 is processed by adopting an axial rolling processing method, and is processed after the blank is subjected to heat treatment.
The internal thread on the nut 2 is formed by adopting tap tapping or forming cutter processing, and heat treatment is carried out after the internal thread processing is finished.
The strength grade of the bolt 1 is 8.8 grade or 10.9 grade, and the strength grade of the nut 2 is 8 grade or 10 grade.
The utility model discloses a circular arc screw thread is shown with the structural parameter of ordinary screw thread for example table 1, the threaded connection of the big footpath specification of the same screw thread is vice, the two stress area is unanimous basically with bearing capacity, the circular arc screw thread is a little bigger, because the circular arc screw thread adopts coarse pitch and non-uniform width tooth thickness, not only effectively reduce stress concentration, improve fatigue performance, its axial fit clearance is big, its manufacturing realizes more easily, the processing cost is lower, the advantage is very obvious in the vice application of big specification threaded connection of specification more than M36. On the premise of equivalent bearing capacity to the thread with the same specification, the bearing performance and the processing performance of the two thread structure parameters belong to the optimal state through repeated tests and verification.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the general inventive concept, and it is intended to cover all such changes and modifications as fall within the true spirit and scope of the invention.
Claims (6)
1. The utility model provides a high strength circular arc threaded connection is vice, includes bolt (1) and nut (2), is provided with the interior outer circular arc screw thread of mutually supporting on bolt (1) and nut (2), its characterized in that: the inner circular arc thread and the outer circular arc thread are connecting threads in surface contact, the continuous circular arc thread on the bolt (1) is an external thread and is formed by sequentially connecting an upper crest circular arc (3), a straight line section (4), a lower root circular arc (5) and the straight line section (4), the radius of the upper crest circular arc (3) is equal to that of the lower root circular arc (5), and the straight line section (4) is respectively tangent to the upper crest circular arc (3) and the lower root circular arc (5); the continuous circular arc thread on the nut (2) is an internal thread and is formed by sequentially connecting an upper semicircular arc (6), a tangential straight line segment (7) and a crest (8), the crest (8) is a plane, the tangential straight line segment (7) is tangent to the upper semicircular arc (6), and the height of the nut (2) is at least 7.5 times of the thread pitch; the thread connection pair is non-equal in width tooth thickness, the external thread tooth thickness is larger than the internal thread tooth thickness, and the external thread tooth form angle is equal to the internal thread tooth form angle.
2. The high-strength circular arc threaded connection pair according to claim 1, characterized in that: the stress sectional area of the threaded connection pair is 1120mm2The thread pitch is 6.35mm, the major diameter of the external thread is 41.5mm, the minor diameter of the external thread is 39mm, the minor diameter of the external thread is 36.5mm, the height of the external thread is 2.5mm, the arc radius of the upper crest is 1.5mm, the arc radius of the lower root is 1.5mm, the minor diameter of the internal thread is 37.5mm, and the height of the internal thread is 2.2 mm; the diagonal distance of the nut is 74mm, the opposite side distance of the nut is 65mm, the height of the nut is 48mm, and the thread angle of the external thread and the thread angle of the internal thread are both 60 degrees.
3. The high-strength circular arc threaded connection pair according to claim 1, characterized in that: the stress sectional area of the threaded connection pair is 1474mm2The thread pitch is 8.5mm, the major diameter of the external thread is 48.3mm, the pitch diameter of the external thread is 45mm, the minor diameter of the external thread is 41.7mm, the height of the external thread is 3.3mm, the arc radius of the upper crest is 2.0mm, the arc radius of the lower root is 2.0mm, the minor diameter of the internal thread is 43.5mm, and the height of the internal thread is 2.8 mm; the diagonal distance of the nut is 80mm, the opposite side distance of the nut is 70mm, the height of the nut is 64mm, and the thread angle of the external thread and the thread angle of the internal thread are both 60 degrees.
4. The high-strength circular arc threaded connection pair according to claim 1, characterized in that: the external thread on the bolt (1) is processed by adopting an axial rolling processing method, and the external thread is processed after blank heat treatment.
5. The high-strength circular arc threaded connection pair according to claim 1, characterized in that: the internal thread on the nut (2) is formed by adopting tap tapping or forming cutter processing, and heat treatment is carried out after the internal thread processing is finished.
6. The high-strength circular arc threaded connection pair according to claim 1, characterized in that: the strength grade of the bolt (1) is 8.8 grade or 10.9 grade, and the strength grade of the nut (2) is 8 grade or 10 grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920598653.2U CN209818480U (en) | 2019-04-28 | 2019-04-28 | High-strength arc threaded connection pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920598653.2U CN209818480U (en) | 2019-04-28 | 2019-04-28 | High-strength arc threaded connection pair |
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| Publication Number | Publication Date |
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| CN209818480U true CN209818480U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920598653.2U Active CN209818480U (en) | 2019-04-28 | 2019-04-28 | High-strength arc threaded connection pair |
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| CN (1) | CN209818480U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109958698A (en) * | 2019-04-28 | 2019-07-02 | 中船重工海为郑州高科技有限公司 | A kind of high intensity circular thread auxiliary connection |
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2019
- 2019-04-28 CN CN201920598653.2U patent/CN209818480U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109958698A (en) * | 2019-04-28 | 2019-07-02 | 中船重工海为郑州高科技有限公司 | A kind of high intensity circular thread auxiliary connection |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 311, Science Avenue, High-tech Zone, Zhengzhou City, Henan Province, 450000 Patentee after: China Shipbuilding Haiwei High tech Co.,Ltd. Address before: 450001 NO.311, science Avenue, high tech Zone, Zhengzhou City, Henan Province Patentee before: HAIWEI ZHENGZHOU HIGH TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |