CN110594269A - Pull rod nut component with high fatigue performance - Google Patents
Pull rod nut component with high fatigue performance Download PDFInfo
- Publication number
- CN110594269A CN110594269A CN201910989793.7A CN201910989793A CN110594269A CN 110594269 A CN110594269 A CN 110594269A CN 201910989793 A CN201910989793 A CN 201910989793A CN 110594269 A CN110594269 A CN 110594269A
- Authority
- CN
- China
- Prior art keywords
- nut
- pull rod
- washer
- gasket
- fatigue performance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012856 packing Methods 0.000 claims description 4
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 238000009661 fatigue test Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention relates to a pull rod nut component with high fatigue performance, which comprises a pull rod, a step nut and a washer, wherein the step nut and the washer are positioned at one end or two ends of the pull rod, the step of the step nut is sleeved into an inner hole of the washer, the middle end surface of the step nut is supported on the end surface of the washer, the pull rod is provided with external threads matched with the step nut at two ends or the whole length, the internal threads of the step nut are matched with the external threads of the pull rod, and the outer surface of the step nut is circular or polygonal. The gasket is a backing plate with an inner hole or a combined gasket, the size of the inner hole of the backing plate is slightly larger than the outer diameter of the step nut, and the combined gasket is composed of a spherical gasket and an inner spherical gasket; the rear end face of the stepped nut is also connected with a locking nut. The assembly enables the stress in the length of the screw pair to be as uniform as possible, reduces the stress concentration condition of the front end screw pair (close to the end of the washer), and thus obviously improves the fatigue performance of the pull rod nut assembly.
Description
Technical Field
The invention relates to a structural component used in the field of prestress, in particular to a pull rod nut component with high fatigue performance.
Background
In engineering construction, particularly in the field of prestressing, tie-rod nut assemblies are commonly used; for example, in the connection structure of the suspension bridge anchorage cable strand, one end of a pull rod nut component is connected to a cable strand anchor head, and the other end is connected to a connection flat plate (the connection flat plate is anchored on the front anchor surface of a concrete body by prestress); also, for example, a tie rod nut component in a rock anchor rod, a tie rod nut component in a large-scale space structure, a high-strength steel tie rod nut component in a prefabricated pier, a tie rod nut component in a rigid hanger rod of a bridge, and the like; the tie rod nut assemblies in these projects tend to be subjected to high static and dynamic loads, and the fatigue resistance of the tie rod nut assemblies is particularly important in relation to the safety and durability of the component.
The existing pull rod nut component mainly comprises a pull rod, a nut and a washer, referring to fig. 1, two end surfaces of the nut are parallel or one end surface is a spherical surface, the shape is circular or polygonal, and an inner hole is provided with a thread matched with the pull rod; the two end surfaces of the washer are parallel or one end surface is a spherical surface, the shape is circular or polygonal (more quadrangles), and the inner hole is larger than the diameter of the pull rod; the pull rod is generally provided with external threads matched with the nut at two ends or the whole length; in the conventional draw-bar nut assembly, the load of the draw bar is transmitted to the nut through a screw pair, and the nut is transmitted to the washer through the end surface and the end surface bearing and attaching of the washer and finally transmitted to the component through the washer.
Under the load action of the existing nut pull rod assembly, the stress in the whole thread pair length is uneven, the stress of the front end thread pair (close to the end of the washer) is the largest, and the stress of the thread pair is smaller towards the back; the front end tie rod thread pair with the highest stress usually fails first, usually expressed as the tie rod breaks at the thread pay-off; in engineering, for the sake of safety, the outer diameter of the pull rod is designed to be larger, the size of a corresponding nut component is also larger, and the stress concentration degree is not changed; for tie-rod nut assemblies subjected to cyclic loading, it is important to reduce stress concentrations.
Disclosure of Invention
The invention aims to: the pull rod nut component with high fatigue performance is designed and improved on the basis of the existing key part structure, so that the stress in the length of a thread pair is uniform as much as possible, the stress concentration condition of the front end thread pair (close to the end of a gasket) is reduced, and the fatigue performance of the pull rod nut component is obviously improved.
The technical scheme for solving the problems is as follows: the utility model provides a pull rod nut component of high fatigue performance, includes pull rod, nut and packing ring, and nut and packing ring are located the one end or both ends of pull rod, its characterized in that: the nut is a stepped nut with a step at one end, the washer is a cushion plate or a combined washer, the step of the stepped nut is sleeved in an inner hole of the washer, the middle end face of the stepped nut is supported on the end face of the washer, the pull rod is provided with external threads matched with the stepped nut at two ends or the whole length, the internal threads of the stepped nut are matched with the external threads of the pull rod, and the outer surface of the stepped nut is circular or polygonal.
The further technical scheme is as follows: the washer is a backing plate provided with an inner hole, the size of the inner hole is slightly larger than the outer diameter of the step of the stepped nut, and the outer surface of the washer is circular or polygonal.
The further technical scheme is as follows: the gasket is a combined gasket which consists of a spherical gasket and an inner spherical gasket;
the step of the step nut is sleeved into the inner hole of the spherical washer of the combined washer, the middle end face of the step nut is supported on the end face of the spherical washer of the combined washer, and the internal thread of the step nut is matched with the external thread of the pull rod.
The further technical scheme is as follows: the rear end face of the stepped nut is also connected with a locking nut.
Due to the adoption of the structure, the pull rod nut component with high fatigue performance has the following beneficial effects:
1. the fatigue performance of the pull rod nut component is obviously improved, see the attached table of comparison table of fatigue test results of the original pull rod nut component and the pull rod nut component I with high fatigue performance.
Under the action of load, the stress in the whole thread pair length is uneven, the stress of the front end thread pair (close to the end of the washer) is the largest, and the stress of the threads is smaller after the front end thread pair is moved backward, so that the front end thread pair with concentrated stress usually fails first, and the phenomenon is shown that the pull rod at the position is broken in advance.
According to the pull rod nut component with high fatigue performance, the nut is changed into the stepped nut with the steps arranged on the end face through structural improvement, the thread pair (the front part of the nut thread pair) in the step section can be freely deformed under the action of pull rod load, the supporting and restraining effect is avoided, the pull rod nut component mainly shows tensile stress, and the stress concentration is small; the step is arranged, so that the thread pair (the partial thread pair behind the nut) in the non-stage bears more pull rod load, the stress in the length of the thread pair is uniform as much as possible, the stress concentration condition of the front end thread pair (close to the end of the washer) is reduced, and the fatigue performance of the pull rod nut component is obviously improved.
2. Raw materials are saved:
because the stress is uniform, the outer diameter size of the pull rod and the corresponding size of the nut component of the pull rod with high fatigue performance are smaller than the size of the existing pull rod nut component under the same load condition.
3. The operation is safer:
according to the pull rod nut component with the locking nut and the high fatigue performance, the locking nut is connected to the rear end face of the stepped nut, so that the nut can be prevented from loosening in working operation, and the operation is safer and more reliable.
The technical features of the pull rod nut assembly with high fatigue performance according to the present invention will be further described with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic view of a conventional pull rod nut assembly;
FIG. 2 is a schematic structural view of a high fatigue pull rod nut assembly according to an embodiment of the present invention:
FIG. 3 is a schematic view (cross-sectional view) of a stepped nut of the present invention;
FIG. 4 is a schematic view (in cross-section) of a washer configuration for the draw rod nut assembly of the present invention;
FIG. 5 is a schematic view (in cross-section) of the nut and washer assembly of the present inventive draw bar nut assembly;
FIG. 6: the pull rod nut component with high fatigue performance of the lock nut in the second embodiment of the invention has a schematic structure;
FIG. 7: the pull rod nut component with the washer as the washer component and high fatigue performance in the third embodiment of the invention has a structural schematic diagram;
FIG. 8: the fourth embodiment of the invention is a structural schematic diagram of a pull rod nut component with high fatigue performance and a locking nut and a washer as a washer component.
FIG. 9: the gasket assembly of the third embodiment and the fourth embodiment of the present invention has a schematic structural view.
In fig. 1:
1 a-nut, 2 a-common washer, 3-pull rod;
in fig. 2-9:
1-step nut, 101-rear end face of step nut, 102-outer surface of step nut, 103-middle end face of step nut, 104-step, 105-internal thread;
2-gasket, 2 a-normal gasket, 2 b-combination gasket, 21-spherical gasket, 22-internal spherical gasket,
201-end face of washer, 201 b-end face of spherical washer, 202-outer face of washer, 202 b-outer face of composite washer, 203-inner bore, 203 b-inner bore of spherical washer; 3-a pull rod; and 4, locking the nut.
Detailed Description
Example one
A high fatigue performance pull rod nut component I:
as shown in fig. 2, the pull rod nut assembly i with high fatigue performance comprises a pull rod 3, a step nut 1 and a washer 2, wherein the step nut 1 and the washer 2 are positioned at two ends of the pull rod 3;
the step 104 of the stepped nut 1 is sleeved into the inner hole 203 of the washer 2, the middle end surface 103 of the stepped nut is supported on the end surface 201 (see fig. 3 and 5) of the washer, and the internal thread 105 of the stepped nut is matched with the external thread of the pull rod 3.
The washer 2 is a shim plate provided with an inner hole 203 (see fig. 4), the size of the inner hole 203 is slightly larger than the outer diameter of the step 104 of the stepped nut 1, and the outer surface 202 of the washer is circular, quadrangular, hexagonal or any other polygonal shape, most of which are circular.
Two ends or the whole length of the pull rod 3 are provided with external threads matched with the stepped nut 1, and the outer surface 102 of the stepped nut is round, quadrilateral, hexagonal or any other polygon, and most of the circular nuts are round.
Aiming at the first embodiment, according to the actual engineering requirements, the comparison test verification is carried out by using the original nut pull rod assembly and the pull rod nut assembly I with high fatigue performance; if a high-strength steel pull rod nut component is adopted in a certain suspension bridge anchorage anchoring system to be used for connecting a main cable strand and a connector, the original pull rod nut component scheme is designed initially, in order to verify the fatigue resistance performance of the suspension bridge, 200 ten thousand load cycle tests are carried out according to the design requirements, all parameters (upper limit load, lower limit load, loading frequency and the like) are tested unchanged, and test results show that the original nut pull rod component fails in tests when more than 110 ten thousand load cycles are carried out on average, and a pull rod is broken at a nut outlet; and the scheme of the pull rod nut component I with high fatigue performance of the invention is used for carrying out fatigue test, 200 ten thousand load cycles can be smoothly completed, and the pull rod nut component I with high fatigue performance does not lose efficacy. The test comparison results are shown in the attached table I.
Attached watch 1
Comparison table of fatigue test results of original pull rod nut component and pull rod nut component I with high fatigue performance
Example two
A high fatigue pull rod nut assembly with lock nut ii:
the basic structure and the connection mode of the pull rod nut component with the locking nut and high fatigue performance are the same as those of the first embodiment, and the difference between the first embodiment and the second embodiment is that: a lock nut 4 (see fig. 6) is also connected to the rear end face 101 of the stepped nut to prevent the nut from loosening during operation.
EXAMPLE III
The washer is a high fatigue performance pull rod nut component III of the washer component:
the basic structure of the pull rod nut component with high fatigue performance is the same as that of the first embodiment, and the pull rod nut component still comprises a pull rod 3, a step nut 1 and a washer 2, wherein the step nut 1 and the washer 2 are positioned at two ends of the pull rod 3;
the difference from the first embodiment is that: the gasket 2 is a combined gasket 2b, and the combined gasket 2b consists of a spherical gasket 21 and an inner spherical gasket 22;
the step 104 of the stepped nut 1 is sleeved into the inner hole 203b of the spherical washer of the combined washer 2b, the middle end surface 103 of the stepped nut is supported on the end surface 201b (see fig. 7) of the spherical washer of the combined washer 2b, and the internal thread 105 of the stepped nut is matched with the external thread of the pull rod 3.
The combined washer 2b consisting of the spherical washer 21 and the inner spherical washer 22 is adopted to be matched with each other, so that the pull rod nut assembly can rotate coordinately when bearing unbalance load to a certain extent, and overlarge additional bending stress generated by unbalance load is reduced.
Example four
The pull rod nut component IV with the locking nut and the washer as the washer component and high fatigue performance is as follows:
the basic structure and the connection mode of the pull rod nut component with high fatigue performance and the locking nut and the washer as the washer component are the same as those of the third embodiment, and the difference from the third embodiment is that: the rear end face of the stepped nut 1 is also connected with a locking nut 4 (see fig. 8) to prevent the nut from loosening in working operation.
As a variation of the first and second embodiments of the present invention, the nut 1 and the washer 2 of the pull rod nut assembly i, ii with high fatigue performance may be located at only one end of the pull rod 3.
As a variation of the third embodiment and the fourth embodiment of the present invention, the nut 1 and the washer assembly 2b of the pull rod nut assemblies iii and iv with high fatigue performance may be located at only one end of the pull rod 3.
Claims (4)
1. The utility model provides a pull rod nut component of high fatigue performance, includes pull rod, nut and packing ring, and nut and packing ring are located the one end or both ends of pull rod, its characterized in that: the nut is a stepped nut (1) with a step at one end, the washer is a cushion plate or a combined washer, the step (104) of the stepped nut (1) is sleeved into an inner hole (203) of the washer (2), the middle end face (103) of the stepped nut is supported on the end face (201) of the washer, the pull rod (3) is provided with external threads matched with the stepped nut (1) at two ends or in the whole length, the internal threads (105) of the stepped nut are matched with the external threads of the pull rod (3), and the outer surface (102) of the stepped nut is circular or polygonal.
2. A high fatigue performance pull rod nut assembly in accordance with claim 1, wherein: the washer (2) is a backing plate provided with an inner hole (203), the size of the inner hole (203) is slightly larger than the outer diameter of the step (104) of the stepped nut (1), and the outer surface (202) of the washer is circular or polygonal.
3. A high fatigue performance pull rod nut assembly in accordance with claim 1, wherein: the gasket (2) is a combined gasket (2 b), and the combined gasket (2 b) consists of a spherical gasket (21) and an inner spherical gasket (22);
the step (104) of the step nut (1) is sleeved into the inner hole (203 b) of the spherical washer of the combined washer (2 b), the middle end face (103) of the step nut is supported on the end face (201 b) of the spherical washer of the combined washer (2 b), and the internal thread (105) of the step nut is matched with the external thread of the pull rod (3).
4. A high fatigue performance pull rod nut assembly according to claim 2 or 3, further comprising: the rear end face of the stepped nut (1) is also connected with a locking nut (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910989793.7A CN110594269A (en) | 2019-10-17 | 2019-10-17 | Pull rod nut component with high fatigue performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910989793.7A CN110594269A (en) | 2019-10-17 | 2019-10-17 | Pull rod nut component with high fatigue performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110594269A true CN110594269A (en) | 2019-12-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910989793.7A Pending CN110594269A (en) | 2019-10-17 | 2019-10-17 | Pull rod nut component with high fatigue performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110594269A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233725A (en) * | 2022-07-05 | 2022-10-25 | 中广核工程有限公司 | Nuclear power main equipment foundation bolt installation method and movable trolley for foundation bolt installation |
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|---|---|---|---|---|
| US5927921A (en) * | 1997-11-11 | 1999-07-27 | Sps Technologies, Inc. | Enhanced fatigue nut |
| CN201496372U (en) * | 2009-08-17 | 2010-06-02 | 贵州航天精工制造有限公司 | Riveting shaft self-locking nut with lining plate |
| CN202048082U (en) * | 2011-04-26 | 2011-11-23 | 泉州凤顺汽车零部件有限公司 | Load balancing type tire bolt component |
| CN202768594U (en) * | 2012-08-03 | 2013-03-06 | 上海电机学院 | Integrated nut |
| CN103953633A (en) * | 2013-12-16 | 2014-07-30 | 曹旭 | Combined locknut |
| CN204025290U (en) * | 2014-08-19 | 2014-12-17 | 瑞标集团有限公司 | A kind of nut of belt washer |
| CN205487927U (en) * | 2015-12-31 | 2016-08-17 | 安徽中电兴发与鑫龙科技股份有限公司 | Insulating pull -rod nut locking device of high pressure vacuum circuit breaker |
| CN205478807U (en) * | 2016-04-06 | 2016-08-17 | 国网湖北省电力公司咸宁供电公司 | Connect fastening accessory |
| CN207814189U (en) * | 2017-12-27 | 2018-09-04 | 朗福紧固科技（西安）有限公司 | A kind of double nut locking mechanism |
| CN108591230A (en) * | 2018-07-19 | 2018-09-28 | 泉州力泰汽车配件制造有限公司 | A kind of stop nut |
| CN210830087U (en) * | 2019-10-17 | 2020-06-23 | 柳州欧维姆机械股份有限公司 | Pull rod nut component with high fatigue performance |
-
2019
- 2019-10-17 CN CN201910989793.7A patent/CN110594269A/en active Pending
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|---|---|---|---|---|
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| CN201496372U (en) * | 2009-08-17 | 2010-06-02 | 贵州航天精工制造有限公司 | Riveting shaft self-locking nut with lining plate |
| CN202048082U (en) * | 2011-04-26 | 2011-11-23 | 泉州凤顺汽车零部件有限公司 | Load balancing type tire bolt component |
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| CN103953633A (en) * | 2013-12-16 | 2014-07-30 | 曹旭 | Combined locknut |
| CN204025290U (en) * | 2014-08-19 | 2014-12-17 | 瑞标集团有限公司 | A kind of nut of belt washer |
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| Title |
|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233725A (en) * | 2022-07-05 | 2022-10-25 | 中广核工程有限公司 | Nuclear power main equipment foundation bolt installation method and movable trolley for foundation bolt installation |
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