CN103010969B - Crane, guying mast and pulling pre-tightening device of guying mast - Google Patents
Crane, guying mast and pulling pre-tightening device of guying mast Download PDFInfo
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- CN103010969B CN103010969B CN201210524826.9A CN201210524826A CN103010969B CN 103010969 B CN103010969 B CN 103010969B CN 201210524826 A CN201210524826 A CN 201210524826A CN 103010969 B CN103010969 B CN 103010969B
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Abstract
The invention provides a crane, a guying mast and a pulling pre-tightening device of the guying mast. The pulling pre-tightening device comprises a first base, a second base, a movable lug, an elastic component and an adjustment cylinder, wherein the movable lug is located between the first and second bases; the first end of the elastic component is connected with the first base and the second end of the elastic component is connected with the first end of the movable lug; and the first end of the adjustment cylinder is connected with the second base, and the second end of the adjustment cylinder is connected with that of the movable lug. By telescopic movement of the adjustment cylinder, the pulling point position of a front tightening steel wire rope and the guying mast is changed, the effect of adjusting the pre-tightening force of the front tightening steel wire rope is achieved, and the structural rigidity of the whole boom can be adjusted.
Description
Technical field
The present invention relates to crane field, more specifically, relate to a kind of hoisting crane, surpassed mast and before draw pre-tightening apparatus.
Background technology
Fig. 1 shows hoisting crane of the prior art and has surpassed the schematic diagram of mast.Hoisting crane comprises crane arm 120, and the head of crane arm 120 is provided with movable pulley 110, has surpassed mast 130 and has been connected pivotly with crane arm 120.Front take-up device comprises front tense wire rope 100, one end of front tense wire rope 100 with surpassed mast 130 and be fixedly connected with, after the other end walks around movable pulley 110, be connected with the ratchet elevator 90 surpassed on mast 130.Hoisting crane also comprises rear take-up device 140, its one end with surpassed mast 130 and be connected, one end is connected with vehicle body.When rotating under the effect of ratchet elevator 90 at tensioning hydro-cylinder, predetermincd tension is applied to front tense wire rope 100, thus by the tensioning of front tense wire rope 100.
The mast that surpassed of the prior art has following shortcoming:
(1) of the prior artly mast 130 has been surpassed and front tense wire rope 100 is arranged on crane arm 120 in a symmetrical manner, cause crane arm 120 symmetrical at the flat in-plane stiffness of convolution, too small on the impact of side sway when predetermincd tension applying on front tense wire rope 100 in luffing plane, cause hoisting crane in long-armed hang and carry time the hoisting capacity that determined by lateral stability or the intensity lifting amplitude that obtains little.
(2) in the structure of tensioning hydro-cylinder driving pawl elevator, rotated by the promotion ratchet elevator 90 that stretches out of the piston rod of tensioning hydro-cylinder, the pretension of tense wire rope 100 before realizing.This version adjustable predetermincd tension scope is less, and ratchet elevator 90, front tense wire rope 100, tensioning hydro-cylinder and tightly lock oil cylinder etc. and be all arranged on the support of ratchet elevator 90, cause this structure stress complicated, higher to the intensity of the support of ratchet elevator 90, rigidity requirement.When the rack arrangement of ratchet elevator 90 is when having surpassed the end of mast 130, the whole center of gravity having surpassed mast 130 also can be made near person who can hear voices a long way off end, reduce the rigidity of whole super lifting device, adverse effect is created to lifting performance.
(3) before tensioning hydro-cylinder directly acts on tense wire rope 100 version in, when there is the faults such as leakage of oil in the hydraulic efficiency pressure system of super lifting device, the pressure drop of tensioning hydro-cylinder can be made, and then make front tense wire rope 100 lose predetermincd tension, cause the reinforcement effect of super lifting device to crane arm 120 to collapse suddenly.
(4) for specific hoisting arm expansion mode, (2) structure and in (3) carries out pretension under arm being lifted arm to a certain angle, but it is very inconvenient during pretension under other arm elevations angle, can directly cause front tense wire rope 100 lower than during this elevation angle predetermincd tension increase, and reduce higher than predetermincd tension during this angle, be unfavorable for the maximum performance of lifting performance under each arm elevation angle.
(5) thrust or the pulling force of the structural requirement tensioning hydro-cylinder in above-mentioned (2) and (3) directly act on on ratchet elevator 90 or front tense wire rope 100, and the requirement therefore to stressed is higher, thus causes the performance requriements of system to tensioning hydro-cylinder higher.
Summary of the invention
The present invention aims to provide a kind of hoisting crane, surpassed mast and before draw pre-tightening apparatus, usually carry out pretension when arm is in a certain angle, the problem high to the performance requriements of tensioning hydro-cylinder to solve in prior art.
For solving the problems of the technologies described above, according to a first aspect of the invention, provide a kind of surpassed mast before draw pre-tightening apparatus, comprising: the first bearing; Second bearing; Mobile lug, mobile lug is between the first bearing and the second bearing; Elastic element, the first end of elastic element is connected with the first bearing, and the second end of elastic element is connected with the first end of mobile lug; Regulate oil cylinder, regulate the first end of oil cylinder to be connected with the second bearing, regulate the second end of oil cylinder to be connected with the second end of mobile lug.
Further, the mobile lug steel rope connecting portion that comprises body and be connected with body; Elastic element and the both sides regulating oil cylinder to lay respectively at body.
Further, the front pre-tightening apparatus that draws also comprises guide, and the first end of guide is connected with the first bearing, and the second end of guide is connected with the second bearing; Body is arranged on pilot hole, and guide is located in pilot hole.
Further, elastic element comprises stage clip, the first mount pad, the second mount pad, telescopic first pilot bar and telescopic multiple second pilot bar, the first end of the first pilot bar and the first end of the second pilot bar are connected with the first mount pad respectively, and the second end of the first pilot bar and the second end of the second pilot bar are connected with the second mount pad respectively; Compression spring sleeve is located on the first pilot bar, and multiple second pilot bar is arranged around the circumference of the first pilot bar.
Further, the first end of elastic element is connected pivotly with the first bearing, and the second end of elastic element is connected pivotly with the first end of mobile lug; Regulate the first end of oil cylinder to be connected pivotly with the second bearing, regulate the second end of oil cylinder to be connected pivotly with the second end of mobile lug.
According to a second aspect of the invention, provide and a kind of surpassed mast, comprise housing, this surpassed mast also comprise above-mentioned before draw pre-tightening apparatus, front the first bearing of pre-tightening apparatus that draws is connected with housing with the second bearing.
Further, the first bearing and the second bearing are arranged on the inside of housing; Housing is provided with the first groove, front outside of drawing the steel rope connecting portion of the mobile lug of pre-tightening apparatus to be protruded from housing by the first groove.
Further, surpassed mast and also comprised friction lining, friction lining is connected with the inside face of housing, and friction lining is provided with puts the second corresponding groove with the first slot, and mobile lug is successively through the second groove and the first groove processus aboralis outside for housing.
According to a third aspect of the present invention, provide a kind of hoisting crane, comprise crane arm and be connected with crane arm surpassed mast, this has surpassed mast is above-mentioned surpassed mast.
Further, surpass mast and also comprise ratchet elevator, hoisting crane also comprises front tense wire rope, one end of front tense wire rope is connected with ratchet elevator, and the other end of front tense wire rope is walked around the movable pulley of the head being arranged on crane arm and is connected with the steel rope connecting portion of the mobile lug having surpassed mast.
By regulating the fore and aft motion of oil cylinder, change front tense wire rope with surpass mast draw a position, reach the effect of the predetermincd tension of the front tense wire rope of adjustment, and the rigidity of structure of whole crane arm can be regulated.In addition, draw pre-tightening apparatus also can be converted into needing in prior art the pulling force overcoming front tense wire rope the friction force overcoming and produce between mobile lug and the housing having surpassed mast before in the present invention, because this reducing the requirement of exchanging fuel-economizing cylinder, and effectively can improve the reliability of hydraulic efficiency pressure system, convenient to obtaining the adjustment of real-time predetermincd tension under the different arm elevation angle.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 diagrammatically illustrates hoisting crane of the prior art and has surpassed the schematic diagram of mast;
Fig. 2 diagrammatically illustrates crane arm in the present invention, has surpassed the scheme of installation of mast and front take-up device; And
Fig. 3 diagrammatically illustrates the close-up schematic view in A portion in Fig. 2.
Reference numeral in figure: 10, the first bearing; 20, the second bearing; 30, mobile lug; 31, body; 32, steel rope connecting portion; 40, elastic element; 41, stage clip; 42, the first mount pad; 43, the second mount pad; 44, the first pilot bar; 45, the second pilot bar; 50, oil cylinder is regulated; 60, guide; 70, housing; 71, the first groove; 80, friction lining; 81, the second groove; 90, ratchet elevator; 100, front tense wire rope; 110, movable pulley; 120, crane arm; 130, mast has been surpassed; 140, rear take-up device.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As a first aspect of the present invention, provide a kind of surpassed mast before draw pre-tightening apparatus.As shown in Figures 2 and 3, pre-tightening apparatus is drawn to comprise before this: the first bearing 10; Second bearing 20; Mobile lug 30, mobile lug 30 is between the first bearing 10 and the second bearing 20; Elastic element 40, the first end of elastic element 40 is connected with the first bearing 10, and the second end of elastic element 40 is connected with the first end of mobile lug 30; Regulate oil cylinder 50, regulate the first end of oil cylinder 50 to be connected with the second bearing 20, regulate the second end of oil cylinder 50 to be connected with the second end of mobile lug 30.
During work, please refer to Fig. 3, regulate oil cylinder 50 to carry out fore and aft motion.Such as, when regulating oil cylinder 50 to stretch out, elastic element 40 is compressed, and mobile lug 30 is to left movement; Otherwise, when regulating oil cylinder 50 to retract, elastic element 40 stretches to the right, mobile lug 30 moves right, thus change front tense wire rope 100 with surpassed mast 130 draw a position, reach the effect of the predetermincd tension of tense wire rope 100 before regulating, and the rigidity of structure of whole crane arm 120 can be regulated.In addition, draw the asynchronous movement of a position (even if two have surpassed and mast 130 draws a position difference) by what surpassed mast 130 to left and right two, also can regulate in real time side sway.
Draw pre-tightening apparatus also can be converted into needing in prior art the pulling force overcoming front tense wire rope 100 friction force overcoming and produce between mobile lug 30 and the housing 70 having surpassed mast 130 before in the present invention, because this reducing the requirement of exchanging fuel-economizing cylinder 50, and effectively can improve the reliability of hydraulic efficiency pressure system, convenient to obtaining the adjustment of real-time predetermincd tension under the different arm elevation angle.
Draw the setting range of pre-tightening apparatus comparatively large before in the present invention, add the alerting ability of system.In addition, by regulating oil cylinder 50 and elastic element 40 conveniently can realize front tense wire rope 100 and the movement of drawing a position surpass mast 130, its version simply, can effectively alleviate outer year of ratchet elevator 90 with the deadweight of whole ratchet system.
Preferably, the mobile lug 30 steel rope connecting portion 32 that comprises body 31 and be connected with body 31; Elastic element 40 and the both sides regulating oil cylinder 50 to lay respectively at body 31.
Preferably, please refer to Fig. 3, the front pre-tightening apparatus that draws also comprises guide 60, and the first end of guide 60 is connected with the first bearing 10, and the second end of guide 60 is connected with the second bearing 20; Body 31 is arranged on pilot hole, and guide 60 is located in pilot hole.Preferably, guide 60 can be pilot bar etc.Under the effect of guide 60, mobile lug 30 can move along the direction determined, thus reaches the object regulating and draw a position.
Preferably, please refer to Fig. 3, elastic element 40 comprises stage clip 41, first mount pad 42, second mount pad 43, telescopic first pilot bar 44 and telescopic multiple second pilot bar 45, the first end of the first pilot bar 44 and the first end of the second pilot bar 45 are connected with the first mount pad 42 respectively, and the second end of the first pilot bar 44 and the second end of the second pilot bar 45 are connected with the second mount pad 43 respectively; Stage clip 41 is set on the first pilot bar 44, and multiple second pilot bar 45 is arranged around the circumference of the first pilot bar 44.First pilot bar 44 and the second pilot bar 45 are structures of telescoping, such as, first pilot bar 44 comprises the first thicker body of rod and the second thinner body of rod, and one end of second body of rod is inserted in the pilot hole of first body of rod, and can move along the pilot hole of first body of rod.Similarly, the second pilot bar 45 also can adopt similar structure.Like this, when regulating oil cylinder 50 stretch out or retract, correspondingly there is shortening or the motion of stretching out in the first pilot bar 44 and the second pilot bar 45, thus provide good guiding for stage clip 41.
Preferably, please refer to Fig. 3, the first end of elastic element 40 is connected pivotly with the first bearing 10, and the second end of elastic element 40 is connected pivotly with the first end of mobile lug 30; Regulate the first end of oil cylinder 50 to be connected pivotly with the second bearing 20, regulate the second end of oil cylinder 50 to be connected pivotly with the second end of mobile lug 30.By can the mode that connects of pivotable, the effect of the pulling force due to front tense wire rope 100 can be avoided, make mobile lug 30 elastic element 40 with regulate the axis of oil cylinder 50 to produce to offset, and cause the problem of operational failure.
As a second aspect of the present invention, provide and a kind of surpassed mast, comprise housing 70, surpassed mast also comprise above-mentioned before draw pre-tightening apparatus, front the first bearing 10 of pre-tightening apparatus that draws is connected with housing 70 with the second bearing 20.
During work, oil cylinder 50 is regulated to carry out fore and aft motion.Such as, when regulating oil cylinder 50 to stretch out, elastic element 40 is compressed, and mobile lug 30 is to left movement; Otherwise, when regulating oil cylinder 50 to retract, elastic element 40 stretches to the right, mobile lug 30 moves right, thus change front tense wire rope 100 with surpassed mast 130 draw a position, reach the effect of the predetermincd tension of tense wire rope 100 before regulating, thus the rigidity of structure of whole crane arm 120 can be regulated.In addition, by having surpassed the asynchronous movement of drawing a position of mast 130 to left and right two, also can regulate in real time side sway.
Draw pre-tightening apparatus also can be converted into needing in prior art the pulling force overcoming front tense wire rope 100 friction force overcoming and produce between mobile lug 30 and the housing 70 having surpassed mast 130 before in the present invention, because this reducing the requirement of exchanging fuel-economizing cylinder 50, and effectively can improve the reliability of hydraulic efficiency pressure system, convenient to obtaining the adjustment of real-time predetermincd tension under the different arm elevation angle.
Draw the setting range of pre-tightening apparatus comparatively large before in the present invention, add the alerting ability of system.In addition, by regulating oil cylinder 50 and elastic element 40 conveniently can realize front tense wire rope 100 and the movement of drawing a position surpass mast 130, its version simply, can effectively alleviate outer year of ratchet elevator 90 with the deadweight of whole ratchet system.
Preferably, please refer to Fig. 3, the first bearing 10 and the second bearing 20 are arranged on the inside of housing 70; Housing 70 is provided with the first groove 71, the front steel rope connecting portion 32 of the mobile lug 30 of pre-tightening apparatus that draws protrudes from the outside of housing 70 by the first groove 71.That is, front inside of drawing pre-tightening apparatus to be installed on to have surpassed mast 130, is connected with front tense wire rope 100 by outwardly mobile lug 30.Certainly, front outside of drawing pre-tightening apparatus also can be arranged on housing 70, only at the surface sliding that mobile lug 30 can be made along housing 70, thus a position is drawn in change.
Preferably, please refer to Fig. 3, surpassed mast and also comprised friction lining 80, friction lining 80 is connected with the inside face of housing 70, and friction lining 80 being provided with second groove 81 corresponding with the first groove 71 position, mobile lug 30 is successively through the second groove 81 and the first groove 71 processus aboralis outside for housing 70.The second groove 81 on friction lining 80 is arranged accordingly with the first groove 71 on housing 70, and like this, mobile lug 30 just can pass these two grooves and be projected into the outside of housing 70, so that tense wire rope 100 before connecting.
In addition, friction lining 80 is installed on the inside face of housing 70, and contacts with mobile lug 30.Like this, when mobile lug 30 slides along the direction of the first groove 71 under the effect regulating oil cylinder 50, mobile lug 30 and the surface contact of friction lining 80, directly can not contact with the surface of housing 70, thus avoid problem housing 70 or mobile lug 30 being damaged due to friction.After friction lining 80 weares and teares, also replaceable new friction lining, very convenient to use.In addition, friction force when friction lining 80 also can effectively reduce mobile, reduces the thrust requirements exchanging fuel-economizing cylinder 50.Preferably, friction lining 80 can adopt the material such as nylon, copper to make.
As a third aspect of the present invention, provide a kind of hoisting crane, comprise crane arm 120 and be connected with crane arm 120 surpassed mast, this has surpassed mast is above-mentioned surpassed mast 130.
Preferably, please refer to Fig. 2, surpass mast 130 and also comprise ratchet elevator 90, hoisting crane also comprises front tense wire rope 100, one end of front tense wire rope 100 is connected with ratchet elevator 90, the other end of front tense wire rope 100 is walked around the movable pulley 110 of the head being arranged on crane arm 120 and is connected with the steel rope connecting portion 32 of the mobile lug 30 having surpassed mast 130, adopts the wiring form of dual-magnification technique namely between tense wire rope 100 and movable pulley 110.
The mast that surpassed of the present invention is connected by the steel rope connecting portion 32 of dual-magnification technique steel rope with mobile lug 30, thus can regulate in real time front tense wire rope 100 with surpassed mast 130 draw a position, realize the real-time adjustment to front tense wire rope 100 predetermincd tension, also realize the adjustment of the rigidity of structure with super lifting device crane arm 120 simultaneously, improve the lifting performance of hoisting crane and hang a year flexibility ratio.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. draw a pre-tightening apparatus before having surpassed mast, it is characterized in that, comprising:
First bearing (10);
Second bearing (20);
Mobile lug (30), described mobile lug (30) is positioned between described first bearing (10) and described second bearing (20);
Elastic element (40), the first end of described elastic element (40) is connected with described first bearing (10), and the second end of described elastic element (40) is connected with the first end of described mobile lug (30);
Regulate oil cylinder (50), the first end of described adjustment oil cylinder (50) is connected with described second bearing (20), and the second end of described adjustment oil cylinder (50) is connected with the second end of described mobile lug (30);
The steel rope connecting portion (32) that described mobile lug (30) comprises body (31) and is connected with described body (31); Described elastic element (40) and described adjustment oil cylinder (50) lay respectively at the both sides of described body (31).
2. before according to claim 1, draw pre-tightening apparatus, it is characterized in that, pre-tightening apparatus is drawn also to comprise guide (60) before described, the first end of described guide (60) is connected with described first bearing (10), and the second end of described guide (60) is connected with described second bearing (20); (31) are arranged on pilot hole to described body, and described guide (60) is located in described pilot hole.
3. before according to claim 1, draw pre-tightening apparatus, it is characterized in that, described elastic element (40) comprises stage clip (41), first mount pad (42), second mount pad (43), telescopic first pilot bar (44) and telescopic multiple second pilot bar (45), the first end of described first pilot bar (44) and the first end of described second pilot bar (45) are connected with described first mount pad (42) respectively, second end of described first pilot bar (44) and the second end of described second pilot bar (45) are connected with described second mount pad (43) respectively, described stage clip (41) is set on described first pilot bar (44), and described multiple second pilot bar (45) is arranged around the circumference of described first pilot bar (44).
4. before according to claim 1, draw pre-tightening apparatus, it is characterized in that, the first end of described elastic element (40) is connected pivotly with described first bearing (10), and the second end of described elastic element (40) is connected pivotly with the first end of described mobile lug (30); The first end of described adjustment oil cylinder (50) is connected pivotly with described second bearing (20), and the second end of described adjustment oil cylinder (50) is connected pivotly with the second end of described mobile lug (30).
5. one kind has surpassed mast, comprise housing (70), it is characterized in that, the described mast that surpassed also comprises before according to any one of Claims 1-4 and draws pre-tightening apparatus, draws first bearing (10) of pre-tightening apparatus to be connected with described housing (70) with the second bearing (20) before described.
6. according to claim 5ly surpassed mast, it is characterized in that, described first bearing (10) and the second bearing (20) are arranged on the inside of described housing (70); Described housing (70) is provided with the first groove (71), before described, draws the steel rope connecting portion (32) of the mobile lug (30) of pre-tightening apparatus to protrude from the outside of described housing (70) by described first groove (71).
7. according to claim 6ly surpassed mast, it is characterized in that, the described mast that surpassed also comprises friction lining (80), described friction lining (80) is connected with the inside face of described housing (70), and described friction lining (80) being provided with second groove (81) corresponding with described first groove (71) position, described mobile lug (30) is successively through described second groove (81) and described first groove (71) the processus aboralis outside for described housing (70).
8. a hoisting crane, comprise crane arm (120) and be connected with described crane arm (120) surpassed mast, it is characterized in that, the described mast that surpassed has surpassed mast (130) according to any one of claim 5 to 7.
9. hoisting crane according to claim 8, it is characterized in that, the described mast (130) that surpassed also comprises ratchet elevator (90), described hoisting crane also comprises front tense wire rope (100), one end of described front tense wire rope (100) is connected with described ratchet elevator (90), and the other end of described front tense wire rope (100) is walked around the movable pulley (110) of the head being arranged on described crane arm (120) and is connected with the described steel rope connecting portion (32) having surpassed the mobile lug (30) of mast (130).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210524826.9A CN103010969B (en) | 2012-12-07 | 2012-12-07 | Crane, guying mast and pulling pre-tightening device of guying mast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210524826.9A CN103010969B (en) | 2012-12-07 | 2012-12-07 | Crane, guying mast and pulling pre-tightening device of guying mast |
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| Publication Number | Publication Date |
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| CN103010969A CN103010969A (en) | 2013-04-03 |
| CN103010969B true CN103010969B (en) | 2015-04-01 |
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| CN201210524826.9A Active CN103010969B (en) | 2012-12-07 | 2012-12-07 | Crane, guying mast and pulling pre-tightening device of guying mast |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103693570B (en) * | 2013-12-12 | 2016-03-23 | 中联重科股份有限公司 | Super lifting device, hoisting crane and control method thereof |
| CN104477793B (en) * | 2014-12-15 | 2016-08-24 | 中联重科股份有限公司 | Crane super lifting device and crane |
| CN106115516B (en) * | 2016-08-31 | 2018-01-12 | 太原重型机械集团工程技术研发有限公司 | Crane, super lifting device and its pretension steel wire rope control method and system |
| CN106586849B (en) * | 2016-12-27 | 2017-12-15 | 中国一冶集团有限公司 | The self-checking device and method of crane waist rope |
| CN111704053B (en) * | 2020-07-23 | 2021-05-07 | 大连理工大学 | Super-lift cable pre-tightening method for all-terrain crane |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202005014075U1 (en) * | 2005-09-06 | 2005-11-10 | Winden- Und Maschinenbau Gressbach Gmbh | Mobile crane for lifting, transporting and positioning of heavy loads has chassis-bearing crane support with jib on crane platform enabling jib to swing round, with part and supports on chassis to align platform |
| CN201287773Y (en) * | 2008-10-31 | 2009-08-12 | 平顶山市利安大机电设备有限公司 | Tensioning mechanism for working caterpillar band |
| CN202296915U (en) * | 2011-09-14 | 2012-07-04 | 三一汽车起重机械有限公司 | Crane, super-lifting device and pre-tightening mechanism of super-lifting device |
| CN102602827B (en) * | 2012-03-14 | 2014-10-01 | 中联重科股份有限公司 | Crane and super-lift device thereof |
| CN202967931U (en) * | 2012-12-07 | 2013-06-05 | 中联重科股份有限公司 | Crane, super-lift mast and front-pulling pre-tightening device thereof |
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