CN203560256U - Non-offset load bolt structure - Google Patents
Non-offset load bolt structure Download PDFInfo
- Publication number
- CN203560256U CN203560256U CN201320638787.5U CN201320638787U CN203560256U CN 203560256 U CN203560256 U CN 203560256U CN 201320638787 U CN201320638787 U CN 201320638787U CN 203560256 U CN203560256 U CN 203560256U
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- Prior art keywords
- nut
- screw rod
- inner nut
- unbalance loading
- bolt arrangement
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- 230000006378 damage Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 10
- 238000013475 authorization Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
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Abstract
The utility model discloses a non-offset load bolt structure which comprises a screw rod (1), inner nuts (2) and outer nuts (3), and is characterized in that a thread head (4) fitted with each inner nut (2) is arranged at each of the two ends of the screw rod (1); the outer nuts (3) are in threaded connection with the inner nuts (2). Through the innovation for combining the screw rod, the inner nuts and the outer nuts, the non-offset load bolt structure provided by the utility model is simple in structure, convenient to mount and detach, excellent in axial performance, and strong in pre-tightening force, protects the threads from damage, has no offset load force or offset load torque.
Description
Technical field
The utility model relates to a kind of bolt arrangement, relates in particular a kind of bolt arrangement without unbalance loading.
Background technique
In the low pressure (LP) cylinder of steam turbine, bolted structure right and wrong are usually shown in.In the process of wriggling in long term thermal, due to insufficient strength and unreasonable structure, low pressure (LP) cylinder can produce some and dehisce, and progressively strengthens.In bolted structure, the generation of the unbalance loading moment of dehiscing easily to cause.Meanwhile, when demounting bolt, the screw thread of bolt is easily destroyed.And general bolt arrangement of the prior art does not have effectively to solve offset loading force square and the destroyed problem of screw thread yet.Chinese patent notice of authorization CN 202790002 U for example, at on 03 13rd, 2013 notice of authorization day, the name of innovation and creation is called a kind of packing ring that loosens, this Patent Case discloses a kind of anti-loose structure, by the structure innovation of body and threaded collar, under dynamic load and high temperature utmost point cold environment, this anti-loose structure has solved the problem of bolt looseness, but this Patent Case is under dynamic load and high temperature utmost point cold environment, there is the inconvenient problem of dismounting in threaded collar, also have the problem of the screw thread of easy destruction bolt when dismounting simultaneously.For another example Chinese patent notice of authorization CN 203035715 U, at on 07 03rd, 2013 notice of authorization day, the name of innovation and creation is called hydraulic bolt, this patent discloses a kind of bolt arrangement, by the combined innovation of screw rod and tapered sleeve, realized the feature of quick mounting and dismounting, but after there is heat wriggling, this Patent Case dismantling screw can be subject to the impact of unbalance loading moment, has easily destroyed problem of screw thread.The utility model, by the combined innovation of screw rod, inner nut and outer nut, provides a kind of simple in structure, and installation and removal are convenient, and axially property is good, and pretightening force is strong, and protection screw thread is not destroyed, without the bolt arrangement without unbalance loading of offset loading force and unbalance loading moment.
Summary of the invention
The utility model solves in prior art general bolt arrangement and does not effectively solve that screw thread is not destroyed and the problem of offset loading force and unbalance loading moment; a kind of bolt arrangement without unbalance loading is provided; by the combined innovation of screw rod, inner nut and outer nut; realizing this bolt arrangement without unbalance loading has simple in structure; installation and removal are convenient, and axially property is good, and pretightening force is strong; protection screw thread is not destroyed, without the feature of offset loading force and unbalance loading moment.
In order to solve the technical problem of above-mentioned existence, the utility model is taked following technical proposals: a kind of bolt arrangement without unbalance loading, comprise screw rod, inner nut and outer nut, it is characterized in that, the two ends of described screw rod are equipped with the thread head suitable with inner nut, and described outer nut is threaded with inner nut.
When mounted, first in one end of screw rod, be screwed into an inner nut, and an outer nut is threaded with this outer nut, then screw rod is penetrated to the corresponding tapped hole of low pressure (LP) cylinder, then the other end at screw rod is screwed into another inner nut, and another outer nut is threaded with this inner nut, finally by all nut screwing clampings with regard to installation.Screw rod, the core component of this bolt arrangement; Inner nut, simple in structure, be connected with screw flight, installation and removal are convenient, improve the axial property of screw rod simultaneously; Outer nut, simple in structure, be threaded with inner nut, installation and removal are convenient, improve the pretightening force that screw rod is connected with nut simultaneously; When outer nut and inner nut are tightened; make inner nut there is certain gap with the corresponding tapped hole of low pressure (LP) cylinder; and outer nut is connected with low pressure (LP) cylinder is fastening; the screw thread of protection screw rod end; prevent that screw thread is destroyed, when heat wriggling occurs low pressure (LP) cylinder, dehiscing appears in the edge of tapped hole; and do not contact with interior outer nut, guarantee that this bolt arrangement is not subject to the impact of offset loading force and unbalance loading moment.Bolt arrangement of the present utility model is compared with two documents, has axial property good, and pretightening force is strong, and protection screw thread is not destroyed, without the feature of offset loading force and unbalance loading moment.
Preferably, the outer surface of described inner nut lower end is concave inward structure, and the internal surface of described outer nut lower end is the interior male structure suitable with inner nut lower end.The interior male structure of the concave inward structure of inner nut and outer nut is mutually spacing, prevents inside and outside nut loosening.
Preferably, the length of described concave inward structure is less than the length of described interior male structure.In guaranteeing, between outer nut, there is the gap of certain altitude, when dehiscing appears in the tapped hole of low pressure (LP) cylinder, guarantee that this bolt arrangement is without offset loading force and unbalance loading moment.
Preferably, the inwall of described inner nut upper end is provided with uniform column.By special tool, insert in inner nut, for the back-outing and be screwed into of inner nut, be easy for installation and removal.
Preferably, the upper end of described outer nut is provided with evenly spaced tab.By special tool, be enclosed within the upper end of outer nut, for the back-outing and be screwed into of outer nut, be easy for installation and removal.
Owing to taking above-mentioned technological scheme; a kind of bolt arrangement without unbalance loading that the utility model provides has such beneficial effect: by the combined innovation of screw rod, inner nut and outer nut; provide a kind of simple in structure; installation and removal are convenient; axially property is good; pretightening force is strong, and protection screw thread is not destroyed, without the bolt arrangement without unbalance loading of offset loading force and unbalance loading moment.
accompanying drawing explanation:
Accompanying drawing 1 is structural representation of the present utility model;
Accompanying drawing 2 is that the A of the utility model accompanying drawing 1 is to enlarged view.
In figure: interior male structure 6 column 7 tabs 8 of screw rod 1 inner nut 2 outer nut 3 thread head 4 concave inward structure 5
embodiment:
Consult accompanying drawing, the utility model be described in further detail:
Embodiment one: by reference to the accompanying drawings 1, and a kind of bolt arrangement without unbalance loading, comprises screw rod 1, inner nut 2 and outer nut 3, and the two ends of screw rod 1 are equipped with the thread head 4 suitable with inner nut 2, and outer nut 3 is threaded with inner nut 2.
When mounted, first in one end of screw rod, be screwed into an inner nut, and an outer nut is threaded with this outer nut, then screw rod is penetrated to the corresponding tapped hole of low pressure (LP) cylinder, then the other end at screw rod is screwed into another inner nut, and another outer nut is threaded with this inner nut, finally by all nut screwing clampings with regard to installation.
Embodiment two, by reference to the accompanying drawings 1 and 2, a kind of bolt arrangement without unbalance loading, comprise screw rod 1, inner nut 2 and outer nut 3, the two ends of screw rod 1 are equipped with the thread head 4 suitable with inner nut 2, outer nut 3 is threaded with inner nut 2, the outer surface of inner nut 2 lower ends is concave inward structure 5, the internal surface of outer nut 3 lower ends is the interior male structure 6 suitable with inner nut 2 lower ends, the length of concave inward structure 5 is less than the length of described interior male structure 6, the inwall of inner nut 2 upper ends is provided with uniform column 7, and the upper end of outer nut 3 is provided with evenly spaced tab 8.
When mounted, first outer nut is threaded with internal thread respectively, form integrative-structure, in one end of screw rod, be screwed into outer nut in a group again, then screw rod is penetrated to the corresponding tapped hole of low pressure (LP) cylinder, then the other end at screw rod is screwed into outer nut in another group, by special tool, outer nut is tightened afterwards, finally by special tool, tightens inner nut with regard to installation.
Above-described two specific embodiments, are described in detail the utility model.Applied specific embodiment herein principle of the present utility model and mode of execution are set forth, embodiment's explanation is just for helping to understand core concept of the present utility model.Should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model core concept; can also carry out some modifications to the utility model; such as concrete technical parameter of the length of concave inward structure and interior male structure, the structure characteristic of column and tab etc., carry out some modifications or combination, within all should dropping on the protection domain of the utility model claim.
Claims (5)
1. the bolt arrangement without unbalance loading, comprise screw rod (1), inner nut (2) and outer nut (3), it is characterized in that, the two ends of described screw rod (1) are equipped with the thread head (4) suitable with inner nut (2), and described outer nut (3) is threaded with inner nut (2).
2. a kind of bolt arrangement without unbalance loading according to claim 1, it is characterized in that, the outer surface of described inner nut (2) lower end is concave inward structure (5), and the internal surface of described outer nut (3) lower end is the interior male structure (6) suitable with inner nut (2) lower end.
3. a kind of bolt arrangement without unbalance loading according to claim 2, is characterized in that, the length of described concave inward structure (5) is less than the length of described interior male structure (6).
4. a kind of bolt arrangement without unbalance loading according to claim 1, is characterized in that, the inwall of described inner nut (2) upper end is provided with uniform column (7).
5. a kind of bolt arrangement without unbalance loading according to claim 1, is characterized in that, the upper end of described outer nut (3) is provided with evenly spaced tab (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320638787.5U CN203560256U (en) | 2013-10-17 | 2013-10-17 | Non-offset load bolt structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320638787.5U CN203560256U (en) | 2013-10-17 | 2013-10-17 | Non-offset load bolt structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203560256U true CN203560256U (en) | 2014-04-23 |
Family
ID=50509979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320638787.5U Expired - Lifetime CN203560256U (en) | 2013-10-17 | 2013-10-17 | Non-offset load bolt structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203560256U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106308040A (en) * | 2016-08-31 | 2017-01-11 | 重庆名匠家具制造有限公司 | Swing table |
-
2013
- 2013-10-17 CN CN201320638787.5U patent/CN203560256U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106308040A (en) * | 2016-08-31 | 2017-01-11 | 重庆名匠家具制造有限公司 | Swing table |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140423 |
|
| CX01 | Expiry of patent term |