CN103452987A - Pipeline expansion pull rod connecting device for steel pipe - Google Patents
Pipeline expansion pull rod connecting device for steel pipe Download PDFInfo
- Publication number
- CN103452987A CN103452987A CN2013103989834A CN201310398983A CN103452987A CN 103452987 A CN103452987 A CN 103452987A CN 2013103989834 A CN2013103989834 A CN 2013103989834A CN 201310398983 A CN201310398983 A CN 201310398983A CN 103452987 A CN103452987 A CN 103452987A
- Authority
- CN
- China
- Prior art keywords
- pull rod
- pull bar
- circular arc
- arc bottom
- thread
- 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
Images
Landscapes
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention relates to a pipeline expansion pull rod connecting device for a steel pipe. The pipeline expansion pull rod connecting device comprises a pull rod, wherein the front end of the pull rod is connected with an expanding head through a first connecting piece, the rear end of the pull rod is connected with expanding equipment through a second connecting piece, and the first connecting piece and the second connecting piece are nuts; arc-bottom external threads are machined on two ends of the pull rod, arc-bottom internal threads are machined on the nuts, and the nuts are connected with the pull rod through the arc-bottom threads. The pipeline expansion pull rod connecting device is compact and reasonable in structure and convenient to manufacture; the front end and the rear end of the pull rod are respectively connected by adopting the large-pitch arc-bottom threads, so that the connecting strength of the pull rod is greatly enhanced, the axial stress is good, and the use requirements of the pull rod are met; meanwhile, due to adoption of the arc-bottom thread connection, the sharp corner stress of a common triangular thread is eliminated, the connecting reliability of the pull rod is good, and the service life of the pull rod is prolonged.
Description
Technical field
The present invention relates to the hole enlargement equipment technical field, especially a kind of steel pipeline hole enlargement pull rod connection device.
Background technique
At present, on market, the manufacturer of production hole enlargement pull bar seldom, produces the manufacturer with hole enlargement pull bar that the performances such as high hardness, tensile strength and toughness are qualified few especially.Domestic market mainly depends on import, but the import price costliness, the cycle is long, affects duration and partner's interests.10,000 steel pipe left and right of the maximum hole enlargements of common common pull bar.
In prior art, as shown in Figure 1, the structural representation of pull bar in prior art, comprise pull bar 2, and the front end of described pull bar 2 is connected with expanding head by the first link 1, and the rear end of described pull bar 2 is by the second link 3 and hole enlargement equipment connection; Described the first link 1 and the second link 3 all adopt nut 4; As shown in Figures 2 and 3, the front end of pull bar 2 and rear end are processed with respectively common outside thread 6, and nut 4 is common internal thread 5, described nut 4 is connected by regular screw threads with pull bar 2, and it is simple in structure, and cost is low, but the axially loaded of pull bar 2 is little, and screw thread is easy to wear, and pull bar is short 2 working lifes.As shown in Figure 4 and Figure 5, the front end of pull bar 2 and rear end are processed with respectively trapezoidal outside thread 8, nut 4 is trapezoidal internal thread 7, described nut 4 is connected by trapezoidal thread with pull bar 2, it is simple in structure, although the axially loaded of trapezoidal thread is large, self-locking performance is poor, unreliable in pull bar 2 using processs, the impact tube quality of processing.
Summary of the invention
The applicant, for the shortcoming in above-mentioned existing production technology, provides a kind of steel pipeline hole enlargement pull rod connection device, thereby improves connection reliability, effectively avoid axial stressed little defect in prior art, greatly increased the intensity of pull bar, safe and reliable, long service life.
The technical solution adopted in the present invention is as follows:
A kind of steel pipeline hole enlargement pull rod connection device, comprise pull bar, the front end of described pull bar is connected with expanding head by the first link, the rear end of described pull bar is by the second link and hole enlargement equipment connection, described the first link and the second link all adopt nut, the circular arc bottom outside thread is processed into respectively at the two ends of described pull bar, and described nut adopts the circular arc bottom internal thread, and described nut is connected with pull bar by the circular arc bottom screw thread.
As further improvement in the technical proposal:
The radius of arc a of described circular arc bottom internal thread is 0.8mm-4mm;
The externally threaded radius of arc b of described circular arc bottom is 4mm-8mm;
The pitch c of described circular arc bottom outside thread and circular arc bottom internal thread is 16mm-24mm.
Beneficial effect of the present invention is as follows:
Compact structure of the present invention, reasonable, easy to make, the pull bar front end adopts respectively the large screw pitch circular arc bottom to be threaded with rear end, greatly strengthened the join strength of pull bar, axially loaded is good, meets the pull bar usage requirement, adopts circular arc bottom to be threaded simultaneously and has eliminated the wedge angle stress that adopts common v thread, the pull bar connection reliability is good, increases the service life.
The accompanying drawing explanation
The scheme of installation that Fig. 1 is pull bar in prior art.
Fig. 2 is that in prior art, nut is connected explosive view (regular screw threads) with pull bar.
Fig. 3 is nut and structural representation (regular screw threads) after pull bar is connected in prior art.
Fig. 4 is that in prior art, nut is connected explosive view (trapezoidal thread) with pull bar.
Fig. 5 is nut and structural representation (trapezoidal thread) after pull bar is connected in prior art.
Fig. 6 is that nut of the present invention is connected explosive view (circular arc bottom worm structure) with pull bar.
Fig. 7 is nut of the present invention and structural representation (circular arc bottom worm structure) after pull bar is connected.
Wherein: 1, the first link; 2, pull bar; 3, the second link; 4, nut; 5, common internal thread; 6, common outside thread; 7, trapezoidal internal thread; 8, trapezoidal outside thread; 9, circular arc bottom internal thread; 10, circular arc bottom outside thread.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
As shown in Figure 6 and Figure 7, the steel pipeline hole enlargement pull rod connection device of the present embodiment, comprise pull bar 2, the front end of pull bar 2 is connected with expanding head by the first link 1, the rear end of pull bar 2 is by the second link 3 and hole enlargement equipment connection, and the first link 1 and the second link 3 all adopt nut 4, and circular arc bottom outside thread 10 is processed into respectively at the two ends of pull bar 2, nut 4 adopts circular arc bottom internal thread 9, and nut 4 is connected with pull bar 2 by the circular arc bottom screw thread.
The radius of arc a of circular arc bottom internal thread 9 is 0.8mm-4mm.
The radius of arc b of circular arc bottom outside thread 10 is 4mm-8mm.
Circular arc bottom outside thread 10 is 16mm-24mm with the pitch c of circular arc bottom internal thread 9.
The diameter of expanding head pull bar 2 of the present invention is 165mm, and adopting the radius of arc a of circular arc bottom internal thread 9 is 0.8mm, and adopting the radius of arc b of circular arc bottom outside thread 10 is 4mm, and circular arc bottom outside thread 10 is 16mm with the pitch c of circular arc bottom internal thread 9.
In actual using process, by the front end at pull bar 2 and rear end, be processed into respectively circular arc bottom outside thread 10, and process the nut 4 with circular arc bottom internal thread 9, at the two ends of pull bar 2, screw and get final product respectively.Easy for installation, cost is low.
Above description is explanation of the invention, is not that limited range of the present invention, referring to claim, within protection scope of the present invention, can be done any type of modification to the restriction of invention.
Claims (4)
1. a steel pipeline hole enlargement pull rod connection device, comprise pull bar (2), the front end of described pull bar (2) is connected with expanding head by the first link (1), the rear end of described pull bar (2) is by the second link (3) and hole enlargement equipment connection, described the first link (1) and the second link (3) all adopt nut (4), it is characterized in that: circular arc bottom outside thread (10) is processed into respectively at the two ends of described pull bar (2), described nut (4) adopts circular arc bottom internal thread (9), and described nut (4) is connected with pull bar (2) by the circular arc bottom screw thread.
2. steel pipeline hole enlargement pull rod connection device as claimed in claim 1, it is characterized in that: the radius of arc (a) of described circular arc bottom internal thread (9) is 0.8mm-4mm.
3. steel pipeline hole enlargement pull rod connection device as claimed in claim 1, it is characterized in that: the radius of arc (b) of described circular arc bottom outside thread (10) is 4mm-8mm.
4. steel pipeline hole enlargement pull rod connection device as claimed in claim 1 is characterized in that: described circular arc bottom outside thread (10) is 16mm-24mm with the pitch (c) of circular arc bottom internal thread (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103989834A CN103452987A (en) | 2013-09-05 | 2013-09-05 | Pipeline expansion pull rod connecting device for steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103989834A CN103452987A (en) | 2013-09-05 | 2013-09-05 | Pipeline expansion pull rod connecting device for steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103452987A true CN103452987A (en) | 2013-12-18 |
Family
ID=49735711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103989834A Pending CN103452987A (en) | 2013-09-05 | 2013-09-05 | Pipeline expansion pull rod connecting device for steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103452987A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576594A (en) * | 2020-12-07 | 2021-03-30 | 泰尔重工股份有限公司 | Large-root fillet uniform-strength thread and machining method thereof |
| CN114008328A (en) * | 2019-07-01 | 2022-02-01 | Ksb股份有限公司 | Pump shaft for multi-stage pump |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943095A (en) * | 1988-03-04 | 1990-07-24 | Nobuyuki Sugimura | Stepped thread and cutoff thread joint exhibiting excellent fatigue resistance |
| CN1542297A (en) * | 2003-04-30 | 2004-11-03 | ɼ����� | Pitch diameter displaced screw |
| JP2005127398A (en) * | 2003-10-23 | 2005-05-19 | Big Alpha Co Ltd | Female screw member, male screw member, and working tool of female screw |
| CN2925683Y (en) * | 2006-03-30 | 2007-07-25 | 番禺珠江钢管有限公司 | Movable expanding machine |
| CN102434561A (en) * | 2011-09-14 | 2012-05-02 | 太原重工股份有限公司 | Low-stress special thread brace rod device and hydropress |
| CN203476986U (en) * | 2013-09-05 | 2014-03-12 | 无锡双友石化机械有限公司 | Steel pipeline expanding pull rod connecting device |
-
2013
- 2013-09-05 CN CN2013103989834A patent/CN103452987A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943095A (en) * | 1988-03-04 | 1990-07-24 | Nobuyuki Sugimura | Stepped thread and cutoff thread joint exhibiting excellent fatigue resistance |
| CN1542297A (en) * | 2003-04-30 | 2004-11-03 | ɼ����� | Pitch diameter displaced screw |
| JP2005127398A (en) * | 2003-10-23 | 2005-05-19 | Big Alpha Co Ltd | Female screw member, male screw member, and working tool of female screw |
| CN2925683Y (en) * | 2006-03-30 | 2007-07-25 | 番禺珠江钢管有限公司 | Movable expanding machine |
| CN102434561A (en) * | 2011-09-14 | 2012-05-02 | 太原重工股份有限公司 | Low-stress special thread brace rod device and hydropress |
| CN203476986U (en) * | 2013-09-05 | 2014-03-12 | 无锡双友石化机械有限公司 | Steel pipeline expanding pull rod connecting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114008328A (en) * | 2019-07-01 | 2022-02-01 | Ksb股份有限公司 | Pump shaft for multi-stage pump |
| CN112576594A (en) * | 2020-12-07 | 2021-03-30 | 泰尔重工股份有限公司 | Large-root fillet uniform-strength thread and machining method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103291719A (en) | Self-plugging rivet | |
| CN103452987A (en) | Pipeline expansion pull rod connecting device for steel pipe | |
| CN203476986U (en) | Steel pipeline expanding pull rod connecting device | |
| CN203452384U (en) | Self-tightened type connecting piece with right-hand threads and left-hand threads | |
| CN203541249U (en) | Novel expanding head structure | |
| CN201443306U (en) | Lengthening and reinforced oil pipe cross-over joint | |
| CN204186715U (en) | A kind of metal rod connector for building of improvement | |
| CN203286146U (en) | Pipe clamp for building | |
| CN105382065A (en) | Pipe bending clamp | |
| CN202812531U (en) | Welding deformation prevention aluminum alloy RP series pipe threaded joint | |
| CN202520729U (en) | Novel screw-thread steel connecting sleeve | |
| CN201561013U (en) | Steel pipe connecting piece | |
| CN201954170U (en) | Hydraulic rubber pipe assembly | |
| CN205253799U (en) | Clamp used for bending pipe | |
| CN203316551U (en) | Corrugated pipe end part flattening tool | |
| CN201075406Y (en) | Ground rod | |
| CN203617164U (en) | Horizontal connecting rod of grounding switch | |
| CN204005191U (en) | Tooth pipe thread pipe fitting in a kind of combined type | |
| CN202082251U (en) | Anti-loosening device of bolt | |
| CN203175680U (en) | Universal type end cap | |
| CN105889275A (en) | Locking steel wire threaded sleeve | |
| CN203297540U (en) | Lead screw | |
| CN208057655U (en) | A kind of special shaped screw bolt on long head | |
| CN203273077U (en) | Pipe joint | |
| CN201610891U (en) | Theftproof device of motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131218 |