CN103708360B - Swing arm tower crane, standard knot introduction system thereof and standard knot introduction method - Google Patents
Swing arm tower crane, standard knot introduction system thereof and standard knot introduction method Download PDFInfo
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- CN103708360B CN103708360B CN201310703535.0A CN201310703535A CN103708360B CN 103708360 B CN103708360 B CN 103708360B CN 201310703535 A CN201310703535 A CN 201310703535A CN 103708360 B CN103708360 B CN 103708360B
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims abstract description 67
- 239000000725 suspension Substances 0.000 claims description 26
- 230000009194 climbing Effects 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 2
- 241000219000 Populus Species 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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Abstract
The utility model provides a standard festival introduction system of swing arm tower machine, including the body of the tower, the cantilever crane, the balance arm, main hoisting mechanism, luffing mechanism and supplementary hoisting mechanism, the cantilever crane includes the arm root that is close to the body of the tower and the arm point of keeping away from the body of the tower, main hoisting mechanism is including the main lifting hook of arm point position department that sets up at the cantilever crane, luffing mechanism installs on the balance arm, supplementary hoisting mechanism includes supplementary lifting hook, supplementary hoist, fixed pulley and supplementary wire rope, the fixed pulley sets up the position department that is close to the arm root on the cantilever crane, supplementary wire rope is from supplementary hoist to be taken out and on the fixed pulley, supplementary lifting hook is connected at supplementary wire rope's tip. The invention also provides a movable arm tower crane with the standard knot introduction system and a standard knot introduction method using the standard knot introduction system. The auxiliary hoisting mechanism of the swing arm tower crane hoists the standard knot to the position near the introducing platform, the elevation angle of the arm support cannot be large, the hoisting speed can be high, the efficiency of introducing the standard knot is high, and the condition that the arm support is overturned due to the fact that the elevation angle is too large is avoided.
Description
Technical field
The present invention relates to elevator machinery field, particularly relate to standard knot introduction system and the standard knot introduction method of a kind of movable arm tower crane and movable arm tower crane.
Background technology
In engineering machinery field, a lot of product has the weight and volume of super large, generally all needs to split into multiple parts and carries out transition, need to re-assembly after arriving another building site.For some of them product, such as crawler crane, horizontal tower machine and movable arm tower crane, for avoiding employing extra equipment, general employing is assembled from the mode of dismounting, namely to be sling by its parts by himself lifting mechanism and assembles.
Refer to Fig. 1, for movable arm tower crane, when installing standard knot 90 additional, being by the suspension hook 94 on its jib 92 top standard knot 90 sling to that it is introduced near platform 97, then standard knot 90 being assembled on tower body 95.In above-mentioned standard knot introducing process, shorter owing to introducing platform 97, and movable arm tower crane realizes luffing action by the pitching of jib 92, therefore the jib 92 of movable arm tower crane needs luffing to arrive comparatively big-elevation, sometimes even to reach its maximum elevation, standard knot 90 could be winched to and introduce near platform 97.
But movable arm tower crane is when the jib elevation angle is larger, and luffing and lifting velocity are all lower, lifting standard knot is lower to introducing platform efficiency; The more important thing is, when jib is in big-elevation for a long time, the danger of oriented tipping backwards, is absolutely unsafe, and eminence wind is often also larger, more increases danger.
Summary of the invention
In view of the above, standard knot introduction system and the standard knot introduction method of movable arm tower crane and the movable arm tower crane providing a kind of efficiency higher and safer is necessary.
The invention provides a kind of standard knot introduction system of movable arm tower crane, comprise tower body, jib, equilibrium arm, main hoisting mechanism, luffing mechanism and auxiliary lifting mechanism, described jib comprises the arm root near tower body and the point of the arm away from tower body, described main hoisting mechanism comprises main suspension hook, described main suspension hook is arranged on the arm point position of described jib, described luffing mechanism is arranged on equilibrium arm, described auxiliary lifting mechanism comprises auxiliary suspension hook, auxiliary elevator, fixed pulley and auxiliary steel wire rope, described fixed pulley is arranged on described jib near arm location of root place, described auxiliary steel wire rope from described auxiliary elevator lay out and coiling to described fixed pulley, described auxiliary suspension hook is connected to the end of described auxiliary steel wire rope.
Further, described movable arm tower crane also comprises climbing support and introduces platform, and described climbing support is enclosed within described tower body, and described introduction platform is arranged on described climbing support, and described introduction platform stretches out from level described climbing support and has the free end away from tower body.
Further, described main hoisting mechanism also comprises master winch and main rope, and it is sharp to the arm of described jib that described main rope lays out also coiling from described master winch, and described main suspension hook is connected to the end of described main rope.
Further, described auxiliary suspension hook and described fixed pulley are positioned at when not carrying out introduction operation directly over the free end of described introduction platform.
Further, the arm root that described jib comprises near tower body saves, and described fixed pulley is arranged on the lower boom position of the arm root joint of described jib.
Further, described arm root joint comprises the first end hinged with described equilibrium arm and the second end away from described equilibrium arm, and described fixed pulley is arranged on described second end.
Further, described master winch and described auxiliary elevator are all arranged on described equilibrium arm, and described auxiliary volume poplar is arranged near described arm root joint place.
The present invention also provides a kind of movable arm tower crane, comprises the standard knot introduction system of above-mentioned movable arm tower crane.
The present invention also provides a kind of standard knot introduction method utilizing the standard knot introduction system of above-mentioned movable arm tower crane, comprising:
Control the luffing mechanism of movable arm tower crane and main hoisting mechanism, standard knot to be introduced is sling by main hoisting mechanism, luffing mechanism luffing, standard knot described to be introduced is risen winch to auxiliary lifting mechanism hang in the scope of carrying;
Standard knot described to be introduced is transplanted to described auxiliary suspension hook from described main suspension hook;
Control luffing mechanism and auxiliary lifting mechanism, standard knot described to be introduced is worked the introduction platform winching to movable arm tower crane.
Compared to prior art, standard knot to rise to winch to by auxiliary lifting mechanism by movable arm tower crane of the present invention to be introduced near platform, because auxiliary lifting mechanism is from tower body close together, now the elevation angle of jib can not be very large, lifting velocity can be very fast, lifting standard knot is higher to introducing platform efficiency, avoids that the jib elevation angle is excessive and tumbling of causing waits danger simultaneously; Except for lifting by crane standard knot, the auxiliary lifting mechanism of movable arm tower crane also can with main hoisting mechanism work compound, the crane lifting service close to tower body is responsible for by auxiliary lifting mechanism, such as carry for hanging of jacking pumping plant, internally climbing tower crane bearing beam and interior transhipment of climbing frame hang and carry, main hoisting mechanism is responsible for from the crane lifting service away from tower body, reduce the lifting blind area of movable arm tower crane, increase the operating radius of movable arm tower crane.
Accompanying drawing explanation
Fig. 1 is that existing movable arm tower crane introduces standard knot to flow diagram during introduction platform;
Fig. 2 is the integral structure schematic diagram of movable arm tower crane of the present invention;
Fig. 3 is the local structure schematic diagram of movable arm tower crane of the present invention;
Fig. 4 is the enlarged drawing at IV place in Fig. 3; And
Fig. 5 is that movable arm tower crane of the present invention introduces standard knot to flow diagram during introduction platform.
Detailed description of the invention
By describing technology contents of the present invention, structural attitude in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with embodiment.
Refer to Fig. 2 to Fig. 4, movable arm tower crane of the present invention comprises tower body 12, jib 13, equilibrium arm 14, main hoisting mechanism and luffing mechanism 20, described jib 13 comprises the arm root near tower body 12 and the point of the arm away from tower body 12, described main hoisting mechanism comprises main suspension hook 152, described main suspension hook 152 is arranged on the arm point position of described jib 13, described luffing mechanism 20 is arranged on equilibrium arm 14, and described luffing mechanism 20 is for carrying out luffing to change the elevation angle of described jib 13 to described jib 13.Described movable arm tower crane also comprises auxiliary lifting mechanism, described auxiliary lifting mechanism comprises auxiliary suspension hook 21, auxiliary elevator 22, fixed pulley 24 and auxiliary steel wire rope 26, described fixed pulley 24 is arranged on described jib 13 near arm location of root place, described auxiliary steel wire rope 26 from described auxiliary elevator 22 lay out and coiling to described fixed pulley 24, described auxiliary suspension hook 21 is connected to the end of described auxiliary steel wire rope 26.
Further, described movable arm tower crane also comprises climbing support 16 and introduces platform 17, described climbing support 16 is enclosed within described tower body 12, and described introduction platform 17 is arranged on described climbing support 16, and described introduction platform 17 stretches out from level described climbing support 16 and has the free end 171 away from tower body 12.
Further, described movable arm tower crane also comprises A shape frame 18, and described A shape frame 18 is arranged on described equilibrium arm 14, and described jib 13, equilibrium arm 14 and A shape frame 18 are positioned at the top of described climbing support 16.
Further, described main hoisting mechanism also comprises master winch 154 and main rope 156, and it is sharp to the arm of described jib 13 that described main rope 156 lays out also coiling from described master winch 154, and described main suspension hook 152 is connected to the end of described main rope 156.
Further, described auxiliary suspension hook 21 and described fixed pulley 24 are positioned at when not carrying out introduction operation directly over the free end 171 of described introduction platform 17.
Further, described jib 13 comprises the arm root joint 132 near tower body 12, and described fixed pulley 24 is arranged on the lower boom position of the arm root joint 132 of described jib 13.
Further, described arm root joint 132 comprises the first end hinged with described equilibrium arm 14 and the second end away from described equilibrium arm 14, and described fixed pulley 24 is arranged on described second end.
Further, described master winch 154 and described auxiliary elevator 22 are all arranged on described equilibrium arm 14, and described auxiliary volume poplar 22 is arranged at saves 132 places near described arm root.
Refer to Fig. 5, when movable arm tower crane needs to raise, described auxiliary lifting mechanism can be utilized to be sling by standard knot, control the elevation angle that luffing mechanism changes jib 13 simultaneously, standard knot can be lifted by crane to introducing platform 17, to complete lifting guide support adding operation when jib 13 elevation angle is little.
Standard knot to rise to winch to by auxiliary lifting mechanism by movable arm tower crane of the present invention to be introduced near platform, because auxiliary lifting mechanism is from tower body close together, now the elevation angle of jib can not be very large, lifting velocity can be very fast, lifting standard knot is higher to introducing platform efficiency, avoids that the jib elevation angle is excessive and tumbling of causing waits danger simultaneously; Except for lifting by crane standard knot, the auxiliary lifting mechanism of movable arm tower crane also can with main hoisting mechanism work compound, the crane lifting service close to tower body is responsible for by auxiliary lifting mechanism, such as carry for hanging of jacking pumping plant, internally climbing tower crane bearing beam and interior transhipment of climbing frame hang and carry, main hoisting mechanism is responsible for from the crane lifting service away from tower body, reduce the lifting blind area of movable arm tower crane, increase the operating radius of movable arm tower crane; When installing movable arm tower crane, the auxiliary suspension hook of auxiliary lifting mechanism can first not installed, and now auxiliary lifting mechanism can be used for wearing around hoist rope and variable-amplitude steel wire rope.
The present invention also provides a kind of movable arm tower crane, comprises the standard knot introduction system of above-mentioned movable arm tower crane.
The present invention also provides a kind of standard knot introduction method utilizing the standard knot introduction system of above-mentioned movable arm tower crane, comprises the steps:
Control the luffing mechanism 20 of movable arm tower crane and main hoisting mechanism, standard knot to be introduced is sling by main hoisting mechanism, luffing mechanism 20 luffing, standard knot described to be introduced is risen winch to auxiliary lifting mechanism hang in the scope of carrying;
Standard knot described to be introduced is transplanted to described auxiliary suspension hook 21 from described main suspension hook 152;
Control luffing mechanism 20 and auxiliary lifting mechanism, standard knot described to be introduced is worked the introduction platform 17 winching to movable arm tower crane.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing specification sheets of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. the standard knot introduction system of a movable arm tower crane, comprise tower body (12), jib (13), equilibrium arm (14), main hoisting mechanism, and luffing mechanism (20), described jib (13) comprises the arm root near tower body (12) and the point of the arm away from tower body (12), described main hoisting mechanism comprises main suspension hook (152), described main suspension hook (152) is arranged on the arm point position of described jib (13), described luffing mechanism (20) is arranged on described equilibrium arm (14), it is characterized in that: described movable arm tower crane also comprises auxiliary lifting mechanism, described auxiliary lifting mechanism comprises auxiliary suspension hook (21), auxiliary elevator (22), fixed pulley (24) and auxiliary steel wire rope (26), it is upper near arm location of root place that described fixed pulley (24) is arranged on described jib (13), described auxiliary steel wire rope (26) from described auxiliary elevator (22) lay out and coiling to described fixed pulley (24), described auxiliary suspension hook (21) is connected to the end of described auxiliary steel wire rope (26).
2. the standard knot introduction system of movable arm tower crane according to claim 1, it is characterized in that: described movable arm tower crane also comprises climbing support (16) and introduces platform (17), described climbing support (16) is enclosed within described tower body (12), described introduction platform (17) is arranged on described climbing support (16), and described introduction platform (17) is stretched out from level described climbing support (16) and had the free end (171) away from tower body (12).
3. the standard knot introduction system of movable arm tower crane according to claim 2, it is characterized in that: described main hoisting mechanism also comprises master winch (154) and main rope (156), it is sharp to the arm of described jib (13) that described main rope (156) lays out also coiling from described master winch (154), and described main suspension hook (152) is connected to the end of described main rope (156).
4. the standard knot introduction system of movable arm tower crane according to claim 3, is characterized in that: described auxiliary suspension hook (21) and described fixed pulley (24) are positioned at when not carrying out introduction operation directly over the free end (171) of described introduction platform (17).
5. the standard knot introduction system of movable arm tower crane according to claim 3, it is characterized in that: described jib (13) comprises arm root joint (132) near tower body (12), described fixed pulley (24) is arranged on the lower boom position of arm root joint (132) of described jib (13).
6. the standard knot introduction system of movable arm tower crane according to claim 5, it is characterized in that: described arm root joint (132) comprises the first end hinged with described equilibrium arm (14) and the second end away from described equilibrium arm (14), and described fixed pulley (24) is arranged on described second end.
7. the standard knot introduction system of movable arm tower crane according to claim 5, it is characterized in that: described master winch (154) and described auxiliary elevator (22) are all arranged on described equilibrium arm (14), described auxiliary elevator (22) is arranged near described arm root joint (132) place.
8. a movable arm tower crane, is characterized in that, comprises the standard knot introduction system of the movable arm tower crane as described in any one of claim 1 to 7.
9. utilize a standard knot introduction method for the standard knot introduction system of the movable arm tower crane described in any one of claim 1 to 7, comprising:
Control the luffing mechanism (20) of movable arm tower crane and main hoisting mechanism, standard knot to be introduced is sling by main hoisting mechanism, luffing mechanism (20) luffing, standard knot described to be introduced is risen winch to auxiliary lifting mechanism hang in the scope of carrying;
Standard knot described to be introduced is transplanted to described auxiliary suspension hook (21) from described main suspension hook (152);
Control luffing mechanism (20) and auxiliary lifting mechanism, standard knot described to be introduced is worked the introduction platform (17) winching to movable arm tower crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310703535.0A CN103708360B (en) | 2013-12-19 | 2013-12-19 | Swing arm tower crane, standard knot introduction system thereof and standard knot introduction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310703535.0A CN103708360B (en) | 2013-12-19 | 2013-12-19 | Swing arm tower crane, standard knot introduction system thereof and standard knot introduction method |
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| CN103708360A CN103708360A (en) | 2014-04-09 |
| CN103708360B true CN103708360B (en) | 2015-12-02 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105347205A (en) * | 2015-11-13 | 2016-02-24 | 中国建筑第八工程局有限公司 | Reverse beam device of internal climbing type movable arm tower crane |
| CN108910728A (en) * | 2018-09-19 | 2018-11-30 | 上海市机械施工集团有限公司 | Hanging apparatus and Lift-on/Lift-off System |
| CN111508309A (en) * | 2020-06-02 | 2020-08-07 | 中国建设教育协会 | Special tower crane of swing arm formula teaching |
| CN112456349B (en) * | 2020-11-26 | 2023-05-23 | 三一汽车起重机械有限公司 | Crane |
| CN114476982B (en) * | 2022-01-19 | 2022-08-16 | 东莞市毅新庆江机械制造有限公司 | Heightening device and heightening method of tower crane |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2345522Y (en) * | 1998-12-07 | 1999-10-27 | 黄信芝 | Self-loading, self-lifting type balance crane |
| CN2460501Y (en) * | 2001-02-10 | 2001-11-21 | 陈毅斌 | Assembling standard steel structure frame |
| US6702132B1 (en) * | 1999-03-19 | 2004-03-09 | Link-Belt Construction Equipment Company, L.P., Lllp | Crane self-assembly system |
| CN201901539U (en) * | 2010-09-27 | 2011-07-20 | 中昇建机(南京)重工有限公司 | Internal climbing type and external climbing type tower crane with luffing jib |
| CN102491191A (en) * | 2011-12-07 | 2012-06-13 | 中联重科股份有限公司 | Tower crane, derrick mast device and hoisting method thereof |
| CN102815627A (en) * | 2012-08-06 | 2012-12-12 | 四川省第三建筑工程公司 | Automatic traction system for large-scale tower-type crane standard-knot removal and installation |
| CN103295457A (en) * | 2013-05-22 | 2013-09-11 | 温州建设集团有限公司 | Examining and training teaching aid and method for assembling and disassembling tower crane |
-
2013
- 2013-12-19 CN CN201310703535.0A patent/CN103708360B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2345522Y (en) * | 1998-12-07 | 1999-10-27 | 黄信芝 | Self-loading, self-lifting type balance crane |
| US6702132B1 (en) * | 1999-03-19 | 2004-03-09 | Link-Belt Construction Equipment Company, L.P., Lllp | Crane self-assembly system |
| CN2460501Y (en) * | 2001-02-10 | 2001-11-21 | 陈毅斌 | Assembling standard steel structure frame |
| CN201901539U (en) * | 2010-09-27 | 2011-07-20 | 中昇建机(南京)重工有限公司 | Internal climbing type and external climbing type tower crane with luffing jib |
| CN102491191A (en) * | 2011-12-07 | 2012-06-13 | 中联重科股份有限公司 | Tower crane, derrick mast device and hoisting method thereof |
| CN102815627A (en) * | 2012-08-06 | 2012-12-12 | 四川省第三建筑工程公司 | Automatic traction system for large-scale tower-type crane standard-knot removal and installation |
| CN103295457A (en) * | 2013-05-22 | 2013-09-11 | 温州建设集团有限公司 | Examining and training teaching aid and method for assembling and disassembling tower crane |
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| CN103708360A (en) | 2014-04-09 |
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Address after: 410007 Dingcheng City, Changde Province, the town of irrigation district ZOOMLION Creek Industrial Park Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. Address before: 410007 Yuelu District, Hunan, silver basin Road, No. 361, No. Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |
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Address after: 410013 Yuelu District, Hunan, silver basin Road, No. 361, No. Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. Address before: 410007 Dingcheng City, Changde Province, the town of irrigation district ZOOMLION Creek Industrial Park Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |