CN102996735B - A kind of method improving jack-up unit gear rack lowering or hoisting gear bearing capacity - Google Patents
A kind of method improving jack-up unit gear rack lowering or hoisting gear bearing capacity Download PDFInfo
- Publication number
- CN102996735B CN102996735B CN201110279889.8A CN201110279889A CN102996735B CN 102996735 B CN102996735 B CN 102996735B CN 201110279889 A CN201110279889 A CN 201110279889A CN 102996735 B CN102996735 B CN 102996735B
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- CN
- China
- Prior art keywords
- driver pinion
- tooth bar
- gear
- lowering
- hoisting gear
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- 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.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
- E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions
Abstract
The present invention is a kind of method and measure of improving marine self-elevating ocean platform gear rack lowering or hoisting gear bearing capacity.Its main method and measure as follows: according to lowering or hoisting gear tooth bar one-sided driver pinion number n, the adjacent driver pinion of reasonable Arrangement and tooth bar Engaging phase difference be 360/7n (n be odd number or even number time) or 25.71 ° (360/14, when only n is even number), carry out chamfer or rounding at tooth bar engagement edge simultaneously.Wherein in lowering or hoisting gear, driver pinion adopts the profile of tooth of large modulus, high displacement.By taking the method for the invention and measure, maximum stress when gear rack monodentate engages can be reduced largely, eliminate tooth bar contact surface problem of stress concentration, thus improve the stress of lowering or hoisting gear gear rack, greatly extend its working life.
Description
Technical field
What the present invention relates to is a kind of method and measure of improving self-elevating ocean platform gear rack lowering or hoisting gear bearing capacity, belongs to ocean engineering field.
Background technique
Jack-up unit, refer to the equipment for exploitation of offshore oil and gas or service exploitation of offshore oil and gas, it has the advantages such as stationkeeping ability is strong, mobile operating good stability, cost are low, has become the main force of continental shelf petroleum exploration and development.There is the relative movement of rising or decline between main hull and spud leg is its maximum feature.At present, lifting self-elevating platform mode mainly contains two kinds: one, hydraulic cylinder jacking mode, and by cooperatively interacting of main and auxiliary oil hydraulic cylinder, implementation platform is elevated.But owing to cannot realize continuous lifting, there is the fluctuation of lifting acceleration comparatively large, lifting stationarity is poor, and rising or falling speed is slow, the shortcomings such as efficiency is low; Two, rack and pinion engagement formula, is engaged with the tooth bar on spud leg by several groups of master gears, the lifting of implementation platform, has rising or falling speed fast, simple to operate, is easy to the advantages such as well location.
Spud leg and lowering or hoisting gear are the critical components of jack-up unit, and its performance quality directly affects safety and the using effect of platform.According to statistics, the accident of jack-up unit has over half when occurring in towage and lift work.Rack and pinion drive mechanism is as the important component part of elevating system, and its significance is self-evident.In conventional gears rack lifting mechanism, between different driver pinion, phase angle is identical, under different engagement, driver pinion and tooth bar contact surface stress and small gear flexural stress change greatly, and under the effect of alternating stress, easily cause gear rack to produce fatigue ruption; And slippage during for preventing rack and pinion engagement, the facewidth of General Requirements gear is greater than the facewidth of tooth bar, tooth bar should not reduce contact surface stress intensity by the mode of widening, Max.contact stress occurs in the two ends of tooth bar contact position simultaneously, easily produces stress and concentrates.
Summary of the invention
The object of the present invention is to provide a kind of method and the measure that improve jack-up unit gear rack lowering or hoisting gear bearing capacity.
The present invention takes following strick precaution and measure to realize by following:
1, tooth bar phase the same side adjacent main is moved and be there is phase difference between small gear, but driver pinion phase place between tooth bar both sides is identical;
2, the number of driver pinion can be 3 or 4 or more, and concrete number need be determined in jacking capacity required by platform and platform general requirement;
3, after tooth bar phase the same side small gear number is determined, phase difference and small gear number between the adjacent driver pinion of tooth bar phase the same side
nrelevant.Driver pinion number
nwhen being odd number, between adjacent driver pinion, phase difference is 360/7
n; Driver pinion number
nwhen being even number, between adjacent driver pinion, phase difference is 360/7
nor 25.71
°.
4, driver pinion modulus is between 80 ~ 100, and pressure angle is between 25 ° ~ 30 °, and modification coefficient is between 0.4 ~ 0.5;
5, take the form of chamfering at the rack flange of lifting spud leg, chamfering can be straight chamfering or rounded corner, and in a preferred embodiment, straight chamfering 2mm × 2mm arranges, rounded corner radius recommendation is between 2mm ~ 4mm.
The positive beneficial effect of the present invention:
The present invention is by phase difference between the adjacent driver pinion in reasonable Arrangement tooth bar the same side, make all driver pinions in the same side contact ratio change difference that it always engages end face under different engagement minimum, thus guarantee that wheel and rack almost remains unchanged at any engagement moment mean exposure area, and mean exposure area to be greater than are all monodentate engagement situations, be less than situation when being all bi-tooth gearings.Above-mentioned way can guarantee that gear rack is in the normal process risen or decline, and its Max.contact stress obviously reduces.In the present invention simultaneously, spud leg both sides keep identical with the driver pinion phase angle that tooth bar engages, thus offset driver pinion generation horizontal radial power.
In a preferred embodiment, when Single Pile adopts 4 cover driver pinion group, be 25.71 by the phase angle difference of the adjacent driver pinion of reasonable Arrangement
°when, gear rack Max.contact stress is obviously declined, and the different engagement moment, its Max.contact stress value amplitude of variation obviously reduces.Cause Gear Root to bend alternating stress amplitude of variation obviously to reduce simultaneously.
Take suitable chamfering measure in tooth bar both sides of the edge, reduce tooth bar both sides of the edge stress concentration phenomenon, obviously reduce gear rack Max.contact stress.In a preferred embodiment, when average single small gear bearing load is 200 tons, by taking rounding radii to be the measure of 2mm in tooth bar both sides of the edge, its Max.contact stress decline degree can be made to reach 17%.
Accompanying drawing explanation
Fig. 1 is that elevator mechanism overlaps embodiment's schematic diagram when driver pinion groups form by three.
Fig. 2 is that elevator mechanism overlaps embodiment's schematic diagram when driver pinion groups form by four.
Fig. 3 is that elevator mechanism overlaps another embodiment's schematic diagram when driver pinion groups form by four.
Fig. 4 is embodiment's schematic diagram of the rack flange chamfering of elevator mechanism.
Fig. 5 is elevating system driver pinion phase difference when being 0 degree, and gear rack contacts total force curve figure.
Fig. 6 contacts total force curve figure with tooth bar for 1,2, No. 3 small gear during the gear arrangement scheme of elevating system shown in Fig. 1.
Fig. 7 contacts total force curve figure with tooth bar for 1a, 2a, 3a and 4a small gear during the gear arrangement scheme of elevating system shown in Fig. 2.
Fig. 8 contacts total force curve figure with tooth bar for 1b during the gear arrangement scheme of elevating system shown in Fig. 3 and 2b small gear.
In figure, in three cover driver pinion group situations: 1, No. 1 small gear; 2, No. 2 small gears; 3, No. 3 small gears; 4, No. 4 small gears; 5, No. 5 small gears; 6, No. 6 small gears.In four cover driver pinion situations: 1a, No. 1 small gear; 1b, No. 1 small gear; 2a, No. 2 small gears; 2b, No. 2 small gears; 3a, No. 3 small gears; 3b, No. 3 small gears; 4a, No. 4 small gears; 4b, No. 4 small gears; 5a, No. 5 small gears; 5b, No. 5 small gears; 6a, No. 6 small gears; 6b, No. 6 small gears; 7a, No. 7 small gears; 7b, No. 7 small gears; 8a, No. 8 small gears; 8b, No. 8 small gears; 9, tooth bar; 10, chamfering.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Reference Fig. 1 is embodiment's schematic diagram that elevator mechanism is made up of three cover driver pinion groups.Because the one-sided driver pinion number of elevator mechanism tooth bar is odd number, differing phase difference between adjacent driver pinion is 360/ (7x3)=17.14
°, namely all differ phase angle about 17.14 between driver pinion 1 with driver pinion 2, between driver pinion 2 with driver pinion 3, between driver pinion 4 with driver pinion 5, between driver pinion 5 with driver pinion 6
°.And keep phase angle identical between the driver pinion of tooth bar heteropleural same position, thus the contrary horizontal radial power in two equal and opposite in directions that two driver pinions are produced, direction is cancelled out each other.
1 and 2, there is equal phase difference between 2 with 3, make 3 cover driver pinions often rotate about 51.43
°(namely 360/7
°) time, its single driver pinion contacts total power change one-period.Driver pinion contact ratio change difference that it always engages end face under different engagement in three, the same side is minimum, wheel and rack is almost remained unchanged at any engagement moment mean exposure area, its mean exposure area be greater than be all monodentate engagement time area of contact, be less than area of contact when being all bi-tooth gearings, finally realize gear rack in the normal process risen or decline, its Max.contact stress obviously reduces in amplitude, and contact stress amplitude of variation obviously reduces.
For more describing situation described in embodiment Fig. 1 in detail, be described in detail with reference to Fig. 6 in conjunction with reference to Fig. 5.When Figure 5 shows that conventional gears gear rack elevating allocation plan, pinion rack contacts total power change curve.In lifting process, small gear contacts total power and remains at about 2000KN with tooth bar, and when namely small gear engages with tooth bar monodentate, it is 2000KN that gear rack contacts total power.With reference to when Figure 6 shows that embodiment Fig. 1, small gear contacts total power change curve with tooth bar.As shown in Figure 6, it contacts total power is cycle alternately change: namely in monodentate meshing zone, small gear contacts total power and drops to about 1500KN with tooth bar, obviously reduces small gear and tooth bar now contact load; Double-teeth toothing region its to contact total power be about 2500KN, but load has two pairs of teeth and bears respectively this moment, and therefore small gear bearing capacity tool improves a lot.
Reference Fig. 2 is that elevator mechanism overlaps embodiment's schematic diagram when driver pinion groups form by four.With reference to Figure 3 shows that the another better example that elevator mechanism is similarly when four cover driver pinion groups form implements schematic diagram.Because the tooth bar homonymy driver pinion number of teeth is even number, therefore between adjacent driver pinion, phase difference has two kinds of setting types, and namely phase difference is respectively is 360/7
n °or 25.71
°.Wherein be respectively with reference to Fig. 2 with during with reference to Fig. 3 gear rack lifting system allocation plan with reference to shown in Fig. 7 with reference Fig. 8, small gear contacts total power change curve with tooth bar.Its principle is identical with reference to principle described in Fig. 6.
When phase difference is determined, driver pinion can convert the order that is arranged above and below with result without impact.Especially with reference in situation shown in Fig. 3,2b and 4b two overlaps driver pinion can order change, and counter stress distribution situation has no effect.
With reference to embodiment's schematic diagram that Fig. 4 is the tooth bar both sides of the edge chamfering of elevator mechanism.Take the measure of chamfer or rounding 10 in tooth bar 9 both sides of the edge, obviously can reduce the stress concentration phenomenon of tooth bar both sides of the edge.Rounding radii should not take excessive rounding, and avoid the area of contact reducing tooth bar and small gear, in a preferred embodiment, radius should be taken as between 2mm ~ 4mm.
Usual driver pinion and tooth bar engage in the process contacted, its Max.contact stress occurs near small gear and tooth bar monodentate operating pitch circle, and there is stress concentration phenomenon in the two ends of tooth bar and small gear contact area, easily cause tooth bar contact stress excessive, thus produce spot corrosion or fatigue ruption.By the phase difference regulating driver pinion to contact with tooth bar, make the tooth bar homonymy different driver pinion generation monodentate engagement moment different, more load born by the small gear of bi-tooth gearing and tooth bar, thus reduce small gear and the contact load of tooth bar of monodentate engagement, thus realize gear rack contact stress and obviously reduce.Take rounding measure simultaneously, alleviate the stress concentration phenomenon of tooth bar both sides largely, obviously reduce tooth bar Max.contact stress, the bearing capacity of wheel and rack can be improved, extend operating life and the reliability of wheel and rack.
The embodiment of the above is only the preferred embodiment of invention, not limits embodiments of the invention scope with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed within protection scope of the present invention.
Claims (3)
1. one kind is improved the method for jack-up unit gear rack lowering or hoisting gear bearing capacity, it is characterized in that: move between small gear in tooth bar phase the same side adjacent main in described gear rack lowering or hoisting gear and there is phase angle difference, driver pinion phase place between tooth bar both sides is identical, wherein the number of driver pinion can be 3 or 4 or more, need jacking capacity required by platform and platform general requirement determine; Between the adjacent driver pinion of tooth bar phase the same side, phase difference is relevant with number of gears n; When driver pinion number n is odd number, between adjacent driver pinion, phase difference is 360/7n °; When driver pinion number n is even number, between adjacent driver pinion, phase difference is 360/7n °; Driver pinion modulus is between 80 ~ 100, and pressure angle is between 25 ~ 30 °, and modification coefficient is between 0.4 ~ 0.5.
2. a kind of method improving jack-up unit gear rack lowering or hoisting gear bearing capacity according to claim 1, is characterized in that: have chamfering at the rack flange of lifting spud leg, chamfering form can be straight chamfering or rounded corner.
3. a kind of method improving jack-up unit gear rack lowering or hoisting gear bearing capacity according to claim 2, is characterized in that: its chamfer radius of described rounded corner is between 2mm ~ 4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110279889.8A CN102996735B (en) | 2011-09-15 | 2011-09-15 | A kind of method improving jack-up unit gear rack lowering or hoisting gear bearing capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110279889.8A CN102996735B (en) | 2011-09-15 | 2011-09-15 | A kind of method improving jack-up unit gear rack lowering or hoisting gear bearing capacity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102996735A CN102996735A (en) | 2013-03-27 |
| CN102996735B true CN102996735B (en) | 2016-02-24 |
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|---|---|---|---|
| CN201110279889.8A Expired - Fee Related CN102996735B (en) | 2011-09-15 | 2011-09-15 | A kind of method improving jack-up unit gear rack lowering or hoisting gear bearing capacity |
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|---|---|---|---|---|
| CN104806728A (en) * | 2014-01-24 | 2015-07-29 | 烟台中集来福士海洋工程有限公司 | Staggered tooth rack |
| CN107061654B (en) * | 2015-02-16 | 2021-02-19 | 日照方源机械科技有限公司 | Screen lifting device |
| CN105134913A (en) * | 2015-08-12 | 2015-12-09 | 苏州安特实业有限公司 | Multi-tooth plate |
| CN105421323B (en) * | 2015-10-26 | 2017-12-15 | 武汉船用机械有限责任公司 | A kind of lifting of ocean platform system and ocean platform |
| CN105936486B (en) * | 2016-05-26 | 2018-10-30 | 武汉船用机械有限责任公司 | A kind of lifting of ocean platform mechanism and ocean platform |
| CN106149659B (en) * | 2016-07-12 | 2018-06-26 | 武汉船用机械有限责任公司 | A kind of retaining mechanism |
| CN106494574B (en) * | 2016-11-09 | 2018-01-19 | 浙江水利水电学院 | The quiet steady system of lake surface spectrum monitoring ship and operating method |
| CN107813319B (en) * | 2017-11-13 | 2020-09-29 | 苏州工业园区职业技术学院 | Multi-shaft industrial cantilever |
| CN108223733B (en) * | 2018-03-13 | 2023-07-14 | 睿恩光电有限责任公司 | Lifting mechanism |
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| CN1259181A (en) * | 1997-06-26 | 2000-07-05 | 莱都诺股份有限公司 | Jack-up platform locking apparatus |
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| CN102022518A (en) * | 2010-12-28 | 2011-04-20 | 中海油田服务股份有限公司 | Rack for marine self-elevating platform lock device and design method thereof |
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2011
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Patent Citations (4)
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|---|---|---|---|---|
| CN1259181A (en) * | 1997-06-26 | 2000-07-05 | 莱都诺股份有限公司 | Jack-up platform locking apparatus |
| CN2391052Y (en) * | 1999-07-28 | 2000-08-09 | 力捷电脑股份有限公司 | Multiple phase gear driving apparatus |
| CN201610544U (en) * | 2010-02-22 | 2010-10-20 | 中国石油集团海洋工程有限公司 | Cylindrical leg self-elevating drilling platform |
| CN102022518A (en) * | 2010-12-28 | 2011-04-20 | 中海油田服务股份有限公司 | Rack for marine self-elevating platform lock device and design method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 自升式平台齿轮齿条升降机构强度分析;张卿;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20110415(第4期);5 * |
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| CN102996735A (en) | 2013-03-27 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Xian Inventor after: Liu Rui Inventor after: Yang Yusheng Inventor after: Liu Huaguo Inventor after: Chen Guoming Inventor after: Yue Jixiang Inventor after: Wang Yunan Inventor after: Wang Tao Inventor after: Xin Xin Inventor after: Gu Renlong Inventor before: Yang Xian Inventor before: Chen Guoming Inventor before: Wang Yunan Inventor before: Yin Shumeng Inventor before: Xu Changhang Inventor before: Lv Tao Inventor before: Yuan Simin Inventor before: Li Hongtao |
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| COR | Change of bibliographic data | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160119 Address after: 257067 No. two, 267 South Road, Dongying District, Shandong, Dongying Applicant after: Shandong Kerui Machinery Manufacturing Co., Ltd Applicant after: SHANDONG SHENGLI PETROLEUM EQUIPMENT INDUSTRY TECHNOLOGY RESEARCH INSTITUTE Address before: 257067 No. two, 233 South Road, Dongying District, Shandong, Dongying Applicant before: SHANDONG KERUI PETROLEUM EQUIPMENT CO., LTD. |
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Granted publication date: 20160224 Termination date: 20200915 |
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| CF01 | Termination of patent right due to non-payment of annual fee |