CN101734554A - Method for delivering constant lifting force with deviations - Google Patents
Method for delivering constant lifting force with deviations Download PDFInfo
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- CN101734554A CN101734554A CN200910113066A CN200910113066A CN101734554A CN 101734554 A CN101734554 A CN 101734554A CN 200910113066 A CN200910113066 A CN 200910113066A CN 200910113066 A CN200910113066 A CN 200910113066A CN 101734554 A CN101734554 A CN 101734554A
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Abstract
The invention discloses a method for delivering constant lifting force with deviations, which comprises the following steps of: setting a lifting point according to a site condition and the lifting weights undertaken by a main machine and an auxiliary machine respectively; and performing delivery lifting if a withstanding force checking computation is qualified. The method is characterized by further comprising the following steps of: increasing the ratio of the lifting weights undertaken by the main machine and the auxiliary machine respectively; setting an equal-height main lifting point on two sides above the gravity center of a vertical heavy object respectively, setting a delivering lifting point below the gravity center, and setting the two main lifting points, the delivering lifting point and the gravity center of the heavy object in the same plane; judging and adjusting the deviations of the settings of the lifting points through a test lifting determination; maintaining the two main machine lifting points at the same level in the whole lifting process; and performing the delivery lifting by lagging the deflection angle of a lifting hook of the auxiliary machine within 3 degrees along a delivery direction from 0 degree. The lifting method can perform lifting without setting a balance beam, can give play to the lifting capacity of a crane, and simultaneously the reliability for safe lifting. The lifting method not only is suitable for the delivery lifting of vertical heavy objects with same main machine specifications, but also is suitable for the delivery lifting of the vertical heavy objects with different main machine specifications.
Description
Technical field belongs to hoisting crane hanging method field at the constant lifting and hanging force delivering method that has deviation, and exactly it is that the hoisting crane suspension centre lifts a kind of hanging method of sending of power unmodified.
When the background technology hoisting crane lifted weight, owing to promote asynchronous and the weight locus changes, suspension centre lifted power and changes immediately, and this is that the insider is in common knowledge, according to the math modeling of the stressed control of hoisting and hanging (math modeling, down with.Referring to: Lin Handing. the math modeling of the stressed control of hoisting and hanging [J], Nanjing College of Architectural Engineering's journal, 1996 (4): 72-77), three suspension centres when lifting suspension centre lifts the variation of power and has only two reasons, the one, (the suspension centre plane, plane that lifted weight thing deviation of gravity center three suspension centres are determined, down together), the 2nd, the out of plumb lifting, suspension centre lifts the power unmodified and lifts the discussion stage that still is at present.
Summary of the invention constant lifting and hanging force lifting is a perfect condition, always has deviation during enforcement, and the present invention occurs under the deviation situation from considering, to reduce as far as possible that the suspension centre power of lifting is changed to departure point and a kind of hoisting crane of designing is sent Hoisting Program.Implement the deviation that the constant lifting and hanging force lifting produces, the one, when being provided with, weight center of gravity and suspension centre plane coplane produce deviation, and the 2nd, hoisting crane allows 3 ° with interior non-perpendicularity, thereby will consider to produce therefore or in controlling out of plumb lifting deviation.
At suspension centre and weight center of gravity coplane the deviation of generation is set, takes to determine the weight center of gravity to suspension centre plane intersection point, the distance of hanging down, pass judgment on suspension centre and deviation is set, adjusts hoisting point position by " weight center of gravity to suspension centre plane intersection point, hang down " apart from detection method; At the suspension centre plane of being hung vertical weight along the left and right folk prescription of weight axis when the deflection, laterally change along weight by the total force active line of center of gravity and the intersection point on suspension centre plane, therefore change the intersection point of the same two main frame suspension centre lines of extended line of sending suspension centre and this intersection point line, promptly changed the power that lifts of two main frame suspension centres.Take the contour setting of two main frame suspension centres for this reason and keep the same level of two main frame suspension centres in the lifting overall process; Because from math modeling as can be known, the suspension centre that calculates when the lifting power of lifting equals by vertical lifting during out of plumb lifts power, multiply by that hoisting rope departs from plumb bob vertical again and is in the triangle on summit with three suspension centres, and relevant hoisting rope coefficients such as the high elevation angle hang down by this suspension centre.Under same suspension hook drift angle, the hoisting rope coefficient is along with its high elevation angle of hanging down accordingly increases and increases, when the elevation angle is 0 ° of hoisting rope coefficient minimum, after heightening, the elevation angle then increases sharply, and the suspension hook drift angle power that lifts when leading increases, and reduces during hysteresis, and has more risk in the lifting of secondary machine, having only vertical lifting is that its suspension hook is 0 ° partially, and it is constant that suspension centre lifts power.Thereby the secondary machine suspension hook drift angle of sending should with 0 ° be the best, exceed in 3 ° to lagging behind with 0 °.The driver can't judge whether (when many suspension centres lift) suspension hook is in plumbness at present, and will be by the lifting director according to monitoring that lifted weight thing vertical lifting person, the information conductor driver that provides control, not only untimely but also inaccurate, thereby hoisting crane (crane) is badly in need of setting up vertical lifting monitor unit (vertical lifting laser monitoring device patent applied for, application number 2009101125319), control the foundation of vertical lifting as the driver; Strengthen major and minor machine simultaneously and bear the ratio of the power of lifting separately, reducing the variable quantity of the power that lifts when secondary machine lags behind lifting, thereby lift the limited reduction of power during with the little hysteresis in secondary machine suspension hook drift angle, rationally share by two main frames.
With the lifting of this lift-on/lift-off system, need not to be provided with equalizing bar, can bring into play the ability that lifts of hoisting crane, improved the reliability of safe lifting simultaneously.This lift-on/lift-off system both had been applicable to when the main frame specification is identical, also be applicable to the main frame specification not simultaneously vertical weight send lifting.
Description of drawings Fig. 1, Fig. 2 are respectively certain tower body suspension centre, lift origin of force master line of vision and overlook to laying scheme drawing.G is the tower body center of gravity among the figure, and A is for sending suspension centre, and B, C are respectively two main suspension centres, O be two main suspension centres always lift origin of force.
Tool is stopped the lift heavy that embodiment bears by major and minor machine separately according to field condition suspension centre is set, and lifts through stressed checking computations are qualified.
1, suspension centre setting: existing tower body scheme drawing with Fig. 1, Fig. 2 is that example is introduced a kind of and suspension centre method to set up weight center of gravity coplane.
1. by strengthening the ratio that suspension centre between major and minor machine lifts power, the power that lifts of determining major-minor machine suspension centre, on the tower body longitudinal centerline, press D
1G compares D
2G equals the ratio that major and minor machine suspension centre lifts power, determines D
1, D
2The point;
2. pass through D
2Make the perpendicular line of tower body longitudinal centerline, two terminal B that itself and tower table body intersect, the suspension centre that C is main frame;
3. pass through D
1Make perpendicular line with the tower body longitudinal centerline, suspension centre A is sent in preliminary election on this line, determine the same B of extended line of A and G line, the intersection point O of 2 lines of C, when the O point to B, C two suspension centre spacings and B, when the C two suspension centre power of lifting are inversely proportional to, A is the suspension centre of being asked of sending.
2, the suspension centre setting should comprise resistance to overturning, the local stability checking computations of being hung the lifting of vertical weight by preliminary election, force analysis qualified.Will hang by examination after suspension centre is provided with, determine the weight center of gravity to the intersection point on suspension centre plane, the distance of hanging down by " the weight center of gravity is to suspension centre plane intersection point, vertical apart from detection method ", the judge suspension centre is provided with deviation, adjusts hoisting point position.
3, main frame should be kept the same level of two main frame suspension centres in the lifting overall process; Secondary machine then in its suspension hook drift angle with 0 ° to sending lifting to lagging behind in 3 ° along the delivery side.
Claims (1)
1. at the constant lifting and hanging force delivering method that has deviation, comprise existing according to field condition, the lift heavy of bearing separately by major and minor machine, main suspension centre is set more than vertical weight center of gravity to be provided with below the weight center of gravity and to send suspension centre, send lifting through stressed checking computations are qualified, it is characterized in that, strengthen the ratio of bearing lift heavy between major and minor machine separately, both sides respectively are provided with a contour main suspension centre relatively more than vertical weight center of gravity, a suspension centre of sending is set below the weight center of gravity, and two main suspension centres, sends suspension centre and the setting of weight center of gravity coplane; Suspension centre is provided with the back and determines the weight center of gravity to suspension centre plane intersection point, the distance of hanging down by " the weight center of gravity is to suspension centre plane intersection point, vertical apart from detection method ", and the judge suspension centre is provided with deviation, adjusts hoisting point position; Main frame is kept the same level of two main frame suspension centres in the lifting overall process, and secondary machine be the best in its suspension hook drift angle with 0 ° then, extremely sends lifting along the delivery side in 3 ° of hysteresis at 0 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910113066A CN101734554A (en) | 2009-12-28 | 2009-12-28 | Method for delivering constant lifting force with deviations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910113066A CN101734554A (en) | 2009-12-28 | 2009-12-28 | Method for delivering constant lifting force with deviations |
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|---|---|
| CN101734554A true CN101734554A (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910113066A Pending CN101734554A (en) | 2009-12-28 | 2009-12-28 | Method for delivering constant lifting force with deviations |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374384A (en) * | 2020-11-20 | 2021-02-19 | 中船华南船舶机械广州有限公司 | Hoisting method of offshore crane |
-
2009
- 2009-12-28 CN CN200910113066A patent/CN101734554A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374384A (en) * | 2020-11-20 | 2021-02-19 | 中船华南船舶机械广州有限公司 | Hoisting method of offshore crane |
| CN112374384B (en) * | 2020-11-20 | 2023-01-10 | 中船华南船舶机械广州有限公司 | Hoisting method of offshore crane |
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| C06 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100616 |