CN103171980B - Tower crane and launching beam and launching system thereof - Google Patents
Tower crane and launching beam and launching system thereof Download PDFInfo
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- CN103171980B CN103171980B CN201310115483.5A CN201310115483A CN103171980B CN 103171980 B CN103171980 B CN 103171980B CN 201310115483 A CN201310115483 A CN 201310115483A CN 103171980 B CN103171980 B CN 103171980B
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- bearing pin
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Abstract
The invention provides a tower crane and a launching beam and a launching system thereof. The launching beam of the tower crane comprises a first beam (1) and a second beam (2), wherein a first fixing part (4) used for fixing the first beam (1) is arranged on the first beam (1); and a first end of the first beam (1) is pivotally connected with a first end of the second beam (2). According to the launching beam of the tower crane, the problem that the fixed launching beam and the lifting steel wire rope are interfered with each other at the minimum turning radius in the prior art can be solved.
Description
Technical field
The present invention relates to tower crane field, more specifically, relate to a kind of tower crane and introduce crossbeam and introduction system.
Background technology
Several introduction crossbeam below the many employings of introduction system of tower crane of the prior art.
Fig. 1 shows the schematic diagram of a kind of introduction system of the prior art.As shown in Figure 1, what this tower crane adopted is upper introduction of method.Wherein, introduce the below that crossbeam 18 is arranged on the undersetting 14 of tower crane, the position of introducing between crossbeam 18 and undersetting 14 is uncontrollable.Introduce on crossbeam 18 and be provided with introduction dolly 13 slidably, the standard knot 15 of introduction is hung in be introduced on dolly 13.When the suspension hook 16 that hoists is in the minimum radius place revolution of tower crane, the problem that introduction system shown in Fig. 1 cannot avoid hoist rope to interfere with introduction crossbeam 18, there is potential safety hazard, therefore can only increase tower machine minimum radius of turning, reduce its lifting performance to avoid interfering.
Schematic diagram when the introduction crossbeam that Fig. 2 shows another kind of introduction system of the prior art stretches out, schematic diagram when Fig. 3 introduction crossbeam shown in Fig. 2 is retracted.As shown in Figures 2 and 3, what this tower crane also adopted is upper introduction of method, and it is introduced crossbeam 18 and can relatively retract left at parallel motion by undersetting 14 after introduction completes, to reduce the length of introduction system by auxiliary device.Although this mode can avoid tower crane when working by a small margin, the problem that hoist rope is interfered with introduction crossbeam, but in the telescopic process of this introduction system, need the connection bearing pin repeatedly dismantled undersetting 14 and introduce between crossbeam 18, complicated operation, and stretch and need a set of auxiliary device, cost is very high, is generally only applicable to large-scale tower crane.
Summary of the invention
The present invention aims to provide a kind of tower crane and introduces crossbeam and introduction system, to solve the fixed introduction crossbeam of prior art when minimum radius of turning and the problem that interferes of hoist rope.
For solving the problems of the technologies described above, according to an aspect of the present invention, providing a kind of introduction crossbeam of tower crane, comprising: first crossbeam, first crossbeam is provided with the first fixed part for fixing first crossbeam; Second cross beam, the first end of first crossbeam is connected pivotly with the first end of second cross beam.
Further, introduce crossbeam and also comprise flexible connecting member, the first end of flexible connecting member is connected with second cross beam.
Further, introduce crossbeam and also comprise the second fixed part for connecting flexible connecting member be arranged on first crossbeam.
Further, introduce crossbeam also comprise mutually can pivotable connect the first articulated section and the second articulated section, first articulated section is arranged on the first end of first crossbeam, second articulated section is arranged on the first end of second cross beam, and first crossbeam is connected with the second articulated section by the first articulated section pivotly with second cross beam.
Further, introduce crossbeam and also comprise the first bearing pin and the second bearing pin, the first articulated section is connected with the second bearing pin by the first bearing pin pivotly with the second articulated section, and the first bearing pin and the second bearing pin are separately positioned on the both sides up and down of first crossbeam or second cross beam.
Further, the mounting part that crossbeam also comprises the second end being arranged on second cross beam is introduced.
Further, the wire rope pulley that crossbeam also comprises the second end being arranged on second cross beam is introduced.
Further, flexible connecting member is folding pull bar, pull bar comprise multiple successively can pivotable connect sub-pull bar.
Further, flexible connecting member is loop chain.
According to a further aspect in the invention, provide a kind of introduction system of tower crane, comprise introduction crossbeam, this introduction crossbeam is above-mentioned introduction crossbeam.
Further, introduction system also comprises introduction dolly, introduces dolly and is slidably arranged on introduction crossbeam.
In accordance with a further aspect of the present invention, provide a kind of tower crane, comprise introduction crossbeam, this introduction crossbeam is above-mentioned introduction crossbeam, introduce crossbeam to be connected with the undersetting of tower crane by its first fixed part, the second end introducing the flexible connecting member of crossbeam is removably connected with undersetting.
Introduction crossbeam in the present invention, when folded state, only has a part for first crossbeam to stretch out the outside of undersetting, and what substantially reduce introduction crossbeam chooses length, reduces the minimum radius of turning of tower crane, improves its lifting performance.In addition, the introduction crossbeam in the present invention also has the feature that structure is simple, easy to operate, cost is low.
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 the schematic diagram of a kind of introduction system of the prior art;
Schematic diagram when the introduction crossbeam that Fig. 2 diagrammatically illustrates another kind of introduction system of the prior art stretches out;
Schematic diagram when Fig. 3 introduction crossbeam diagrammatically illustrated in Fig. 2 is retracted;
Fig. 4 diagrammatically illustrates introduction crossbeam in first embodiment of the invention and the schematic diagram of introduction system when introducing operating mode;
Fig. 5 diagrammatically illustrates introduction crossbeam in first embodiment of the invention and the schematic diagram of introduction system after introducing;
Fig. 6 diagrammatically illustrates introduction crossbeam in second embodiment of the invention and the schematic diagram of introduction system when introducing operating mode;
Fig. 7 diagrammatically illustrates introduction crossbeam in second embodiment of the invention and the schematic diagram of introduction system after introducing;
Fig. 8 diagrammatically illustrates the folding process schematic diagram one of introduction crossbeam of the present invention and introduction system;
Fig. 9 diagrammatically illustrates the folding process schematic diagram two of introduction crossbeam of the present invention and introduction system;
Figure 10 diagrammatically illustrates the folding process schematic diagram three of introduction crossbeam of the present invention and introduction system;
Figure 11 diagrammatically illustrates the folding process schematic diagram four of introduction crossbeam of the present invention and introduction system; And
Figure 12 diagrammatically illustrates the folding process schematic diagram five of introduction crossbeam of the present invention and introduction system.
Reference numeral in figure: 1, first crossbeam; 2, second cross beam; 3, flexible connecting member; 4, the first fixed part; 5, the second fixed part; 6, the first articulated section; 7, the second articulated section; 8, the first bearing pin; 9, the second bearing pin; 10, mounting part; 11, wire rope pulley; 12, sub-pull bar; 13, dolly is introduced; 14, undersetting; 15, standard knot; 16, hoist suspension hook; 17, auxiliary suspension hook is introduced; 18, crossbeam is introduced.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
As a first aspect of the present invention, provide a kind of introduction crossbeam of tower crane.As shown in Figure 4 and Figure 5, this introduction crossbeam comprises: first crossbeam 1, first crossbeam 1 is provided with the first fixed part 4 for fixing first crossbeam 1; Second cross beam 2, the first end of first crossbeam 1 is connected pivotly with the first end of second cross beam 2.
Fig. 4 introduction crossbeam shown in the present invention is in schematic diagram during extended configuration in introducing process.Fig. 5 introduction crossbeam shown in the present invention is in schematic diagram during folded state after introducing.As shown in Figure 4, in introducing process, second cross beam 2 relatively first crossbeam 1 turns to the state of level.After introduction, as shown in Figure 5, second cross beam 2 is made to be pivotally lowered into the folding position shown in Fig. 5.
Like this, whole introduction crossbeam only has a part for first crossbeam 1 to stretch out the outside of undersetting 14, and what substantially reduce introduction crossbeam chooses length, now, only has when hoist rope arrives the right-hand member of first crossbeam 1, the problem that just can interfere.Therefore, reduce the minimum radius of turning of tower crane, improve its lifting performance.In addition, the introduction crossbeam in the present invention also has the feature that structure is simple, easy to operate, cost is low.
Preferably, introduce crossbeam and also comprise flexible connecting member 3, the first end of flexible connecting member 3 is connected with second cross beam 2.As shown in Figure 4, in introducing process, second cross beam 2 relatively first crossbeam 1 turns to the state of level, and now, the first end of flexible connecting member 3 is connected with second cross beam 2, and its second end is connected with the undersetting 14 of tower crane.So flexible connecting member 3 is in tension, to provide certain pulling force to second cross beam 2, determine the rigidity of first crossbeam 1 and second cross beam 2.After introduction, as shown in Figure 5, the connection between flexible connecting member 3 and undersetting 14 can be removed, or the centre of flexible connecting member 3 is taken apart, thus make second cross beam 2 under its effect of conducting oneself with dignity, be pivotally lowered into the folding position shown in Fig. 5.
Preferably, please refer to Fig. 4 and Fig. 5, introduce crossbeam and also comprise the second fixed part 5 for connecting flexible connecting member 3 be arranged on first crossbeam 1.In the process introduced, one end of flexible connecting member 3 can be connected with undersetting 14.After introduction, please refer to Fig. 5, disassembling flexible connecting member 3 from undersetting 14 or being disconnected at the middle part of flexible connecting member 3, and the free end of the flexible connecting member 3 be connected with second cross beam 2 is connected with the second fixed part 5.Like this, the sagging angle of second cross beam 2 can be limited by this part flexible connecting member 3, shake in the process that also can prevent second cross beam 2 from rotating at tower crane and cause safety problem.
Preferably, please refer to Fig. 4 and Fig. 5, introduce crossbeam also comprise mutually can pivotable connect the first articulated section 6 and the second articulated section 7, first articulated section 6 is arranged on the first end of first crossbeam 1, second articulated section 7 is arranged on the first end of second cross beam 2, and first crossbeam 1 is connected with the second articulated section 7 by the first articulated section 6 pivotly with second cross beam 2.
Preferably, please refer to Fig. 4 and Fig. 5, introduce crossbeam and also comprise the first bearing pin 8 and the second bearing pin 9, first articulated section 6 and the second articulated section 7 are by the first bearing pin 8 and the pivotable connection of the second bearing pin 9, and the first bearing pin 8 and the second bearing pin 9 are separately positioned on the both sides up and down of first crossbeam 1 or second cross beam 2.Preferably, the first articulated section 6 and the second articulated section 7 take the shape of the letter U, and first crossbeam 1 and second cross beam 2 are connected respectively with bottom the U-shaped of the first articulated section 6 and the second articulated section 7, and two of U-shaped arms protrude from the both sides up and down of first crossbeam 1 and second cross beam 2.The arm of the corresponding U-shaped of the first articulated section 6 and the second articulated section 7 is respectively by the first bearing pin 8 and the pivotable connection of the second bearing pin 9.Especially, the first bearing pin 8 is connected with the first articulated section 6 and the second articulated section 7 detouchable with the second bearing pin 9.
Like this, when needing second cross beam 2 position as shown in Figure 4 to rotate, the first bearing pin 8 of the top being positioned at first crossbeam 1 can be removed, and the second bearing pin 9 is arranged on the first articulated section 6 and the second articulated section 7.When needing second cross beam 2 position as shown in Figure 4 upwards to rotate, the second bearing pin 9 of the below being positioned at first crossbeam 1 can be removed, and the first bearing pin 8 is arranged on the first articulated section 6 and the second articulated section 7.When needing second cross beam 2 to be locked onto the position with first crossbeam 1 level, the first bearing pin 8 and the second bearing pin 9 can be installed simultaneously.Certainly, the pivot connector structure of other form can also be adopted between first crossbeam 1 and second cross beam 2.
Preferably, please refer to Fig. 4, introduce the mounting part 10 that crossbeam also comprises the second end being arranged on second cross beam 2.The suspension hook 16 that hoists of tower crane can be utilized to hook second cross beam 2 by mounting part 10, like this, coordinate the installation situation of above-mentioned first bearing pin 8 and the second bearing pin 9, operate the suspension hook about 16 that hoists, just second cross beam 2 can be rotated up or down.
Preferably, please refer to Fig. 4, introduce the wire rope pulley 11 that crossbeam also comprises the second end being arranged on second cross beam 2.Preferably, wire rope pulley (not shown) is also provided with at the second end of first crossbeam 1.Preferably, introduce crossbeam also to comprise hauling rope and be arranged on the reel (not shown) on described first crossbeam 1, the first end of hauling rope with first direction around on reel, second end of hauling rope around on wire rope pulley 11 with the second direction contrary with first direction, is introduced dolly 13 and is connected with the second end of hauling rope.When needs will introduce dolly 13 along introduction cross beam movement, spool turns can be made by actuating device or manual mode, thus the introduction dolly 13 in Fig. 4 is moved to the left or to the right.
Preferably, in the embodiment shown in Fig. 4 and Fig. 5, flexible connecting member 3 is folding pull bars, pull bar comprise multiple successively can pivotable connect sub-pull bar 12.Preferably, removably connect between adjacent two sub-pull bars 12 at least partially.Preferably, in the embodiment shown in Fig. 6 and Fig. 7, flexible connecting member 3 is loop chains.Certainly, flexible connecting member 3 also can be other version.
As a second aspect of the present invention, please refer to Fig. 4 to Fig. 7, provide a kind of introduction system of tower crane, comprise introduction crossbeam, this introduction crossbeam is above-mentioned introduction crossbeam.
Preferably, introduction system also comprises introduces dolly 13, introduces dolly 13 and is slidably arranged on introduction crossbeam.
Below in conjunction with Fig. 8 to Figure 12, the working process of the introduction crossbeam in the present invention and introduction system is described in detail.In Fig. 8 to Figure 12, flexible connecting member 3 is used to be folding pull bars.
The first fixed part 4 introduced on the first crossbeam 1 of crossbeam is connected with undersetting 14, like this, is installed on undersetting 14 by introduction crossbeam.One end of flexible connecting member 3 is connected with undersetting 14 (preferably, can be connected with the sidewall of undersetting 14), and the other end is connected with second cross beam 2 (such as, being connected with the middle part of second cross beam 2), holds second cross beam 2 from side direction.
Standard knot (not shown) to be introduced is hung in by the auxiliary suspension hook 17 of introduction and hoists on suspension hook 16, and is upwards lifted to the position corresponding with introducing crossbeam by the suspension hook 16 that hoists.Then operate the suspension hook 16 that hoists standard knot to be transferred on introduction dolly 13.Then, introduction dolly 13 can be made to left movement (such as, the operation to reel can be passed through), thus standard knot is delivered to preposition.
Move arrive on the position (namely on first crossbeam 1) shown in Fig. 9 when introducing dolly 13, hang over the introduction hoisted on suspension hook 16 and assist suspension hook 17 to hook mounting part 10 on second cross beam 2.Then, the first bearing pin 8 is installed, and removes the second bearing pin 9, make suspension hook 16 upward movement that hoists, thus second cross beam 2 is rotated counterclockwise around the first bearing pin 8.So flexible connecting member 3 becomes the relaxed state shown in Fig. 9 from tensioning state.
Then, please refer to Figure 10, the coupling end of flexible connecting member 3 with undersetting 14 is taken apart, or adjacent for certain of flexible connecting member 3 two sub-pull bars 12 are taken apart, and the second fixed part 5 in the free end of the flexible connecting member 3 be connected with second cross beam 2 after taking apart and first crossbeam 1 is coupled together (such as can by bearing pin etc.).
Further, install the second bearing pin 9, and remove the first bearing pin 8, the suspension hook 16 that makes to hoist moves downward, thus second cross beam 2 is rotated clockwise around the second bearing pin 9.So flexible connecting member 3 state as shown in Figure 10, through the state shown in Figure 11, and finally becomes the state shown in Figure 12.
Preferably, length and the pivot position thereof of each sub-pull bar 12 of flexible connecting member 3 can be determined according to the geometric relationship between introduction state and folded state, with realize introduce state time hold second cross beam 2, second cross beam 2 and first crossbeam 1 is made to keep the requirement of horizontality, and when folded state, by the requirement that second cross beam 2 is fixed up, preferably, the length of each sub-pull bar 12 can be different.Especially, the state shown in Figure 12, flexible connecting member 3 is deformed into right angle condition, to make second cross beam 2 stably remain on vertical state, prevents it from continuing along rotating clockwise owing to rock etc., and causes safety problem.In addition, also can, when the second bearing pin 9 meets accident, prevent second cross beam 2 from coming off from high-altitude, cause safety misadventure.
For the form that flexible connecting member 3 is loop chain or other structure, its service condition with reference to above-mentioned folding pull bar working process, can not repeat them here.
It should be noted that, the flexible connecting member 3 of quovis modo both can adopt the form of the downward upset in Fig. 8 to Figure 12, also can adopt the resupinate form in Fig. 7.In resupinate embodiment, mounting part 10 can be arranged on the downside of second cross beam 2, so that the suspension hook 16 that hoisted hooks.Preferably, in resupinate embodiment, second cross beam 2 can be fixed to certain position of undersetting 14.
As a third aspect of the present invention, please refer to Fig. 4 to Figure 12, provide a kind of tower crane, comprise introduction crossbeam, this introduction crossbeam is above-mentioned introduction crossbeam, introduce crossbeam to be connected with the undersetting 14 of tower crane by its first fixed part 4, the second end introducing the flexible connecting member 3 of crossbeam is removably connected with undersetting 14.
When the present invention can avoid tower crane to work by a small margin, the problem that the suspension hook 16 that hoists is interfered with introduction crossbeam, can meet again under introduction operating mode simultaneously, needs to introduce crossbeam and stretches out longer to introduce the requirement of increasing smoothly.Introduction system in the present invention is rational in infrastructure, without particular/special requirement, has and makes simple, with low cost, fitting operation convenience, safe and reliable feature.
In addition, the present invention is applicable to the tower crane of various model, no matter is movable arm tower crane or horizontal arm tower machine, or Large Towers machine or small-sized tower machine all can adopt the program, and application widely, is easy to promote, has great practical value.
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 (8)
1. an introduction crossbeam for tower crane, is characterized in that, comprising:
First crossbeam (1), described first crossbeam (1) is provided with the first fixed part (4) for fixing described first crossbeam (1);
Second cross beam (2), the first end of described first crossbeam (1) is connected pivotly with the first end of described second cross beam (2);
Described introduction crossbeam also comprises flexible connecting member (3), the first end of described flexible connecting member (3) is connected with described second cross beam (2), and the second end of described flexible connecting member (3) is removably connected with the undersetting (14) of tower crane;
Described introduction crossbeam also comprises the second fixed part (5) for connecting described flexible connecting member (3) be arranged on described first crossbeam (1);
Described introduction crossbeam also comprise mutually can pivotable connect the first articulated section (6) and the second articulated section (7), described first articulated section (6) is arranged on the first end of described first crossbeam (1), described second articulated section (7) is arranged on the first end of described second cross beam (2), and described first crossbeam (1) is connected with described second articulated section (7) by described first articulated section (6) pivotly with described second cross beam (2);
Described introduction crossbeam also comprises the first bearing pin (8) and the second bearing pin (9), described first articulated section (6) is connected with described second bearing pin (9) by described first bearing pin (8) pivotly with described second articulated section (7), and described first bearing pin (8) and described second bearing pin (9) are separately positioned on the both sides up and down of described first crossbeam (1) or described second cross beam (2);
When folding described second cross beam (2), remove described second bearing pin (9), described second cross beam (2) is rotated counterclockwise around described first bearing pin (8), and described flexible connecting member (3) becomes relaxed state from tensioning state; Then the coupling end of described flexible connecting member (3) and described undersetting (14) is taken apart, and described second fixed part (5) in the free end of the described flexible connecting member (3) be connected with described second cross beam (2) after taking apart and described first crossbeam (1) is coupled together; Described second bearing pin (9) is then installed, and removes described first bearing pin (8), described second cross beam (2) is rotated clockwise around described second bearing pin (9).
2. introduction crossbeam according to claim 1, is characterized in that, described introduction crossbeam also comprises the mounting part (10) of the second end being arranged on described second cross beam (2).
3. introduction crossbeam according to claim 1, is characterized in that, described introduction crossbeam also comprises the wire rope pulley (11) of the second end being arranged on described second cross beam (2).
4. introduction crossbeam according to claim 1, is characterized in that, described flexible connecting member (3) is folding pull bar, described pull bar comprise multiple successively can pivotable connect sub-pull bar (12).
5. introduction crossbeam according to claim 1, is characterized in that, described flexible connecting member (3) is loop chain.
6. an introduction system for tower crane, comprises introduction crossbeam, it is characterized in that, described introduction crossbeam is the introduction crossbeam according to any one of claim 1 to 5.
7. introduction system according to claim 6, is characterized in that, described introduction system also comprises introduces dolly (13), and described introduction dolly (13) is slidably arranged on described introduction crossbeam.
8. a tower crane, comprise introduction crossbeam, it is characterized in that, described introduction crossbeam is the introduction crossbeam according to any one of claim 1 to 5, and described introduction crossbeam is connected with the undersetting (14) of described tower crane by its first fixed part (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310115483.5A CN103171980B (en) | 2013-04-03 | 2013-04-03 | Tower crane and launching beam and launching system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310115483.5A CN103171980B (en) | 2013-04-03 | 2013-04-03 | Tower crane and launching beam and launching system thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103171980A CN103171980A (en) | 2013-06-26 |
| CN103171980B true CN103171980B (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310115483.5A Active CN103171980B (en) | 2013-04-03 | 2013-04-03 | Tower crane and launching beam and launching system thereof |
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| Country | Link |
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| CN (1) | CN103171980B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342300B (en) * | 2013-07-19 | 2015-04-01 | 中联重科股份有限公司 | Tower crane, as well as lead-in system and standard knot lead-in method thereof |
| CN103449317B (en) * | 2013-09-12 | 2015-09-30 | 中联重科股份有限公司 | Standard knot guiding device |
Citations (6)
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| RU2225344C2 (en) * | 2001-11-08 | 2004-03-10 | Лунден Евгений Ефимович | Tower crane and method of its mounting and demounting |
| CN201313792Y (en) * | 2008-11-18 | 2009-09-23 | 江麓机电科技有限公司 | Lengthened hinge introducing platform of tower crane |
| CN102328883A (en) * | 2011-07-27 | 2012-01-25 | 长沙中联重工科技发展股份有限公司 | Telescopic importing system and crane with same |
| CN102491192A (en) * | 2011-12-15 | 2012-06-13 | 中联重科股份有限公司 | Tower crane introducing platform structure |
| CN202322115U (en) * | 2011-12-06 | 2012-07-11 | 中联重科股份有限公司 | Tower crane and balancing boom thereof |
| CN103058070A (en) * | 2012-12-28 | 2013-04-24 | 徐州重型机械有限公司 | An introducing beam and a tower crane |
-
2013
- 2013-04-03 CN CN201310115483.5A patent/CN103171980B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2225344C2 (en) * | 2001-11-08 | 2004-03-10 | Лунден Евгений Ефимович | Tower crane and method of its mounting and demounting |
| CN201313792Y (en) * | 2008-11-18 | 2009-09-23 | 江麓机电科技有限公司 | Lengthened hinge introducing platform of tower crane |
| CN102328883A (en) * | 2011-07-27 | 2012-01-25 | 长沙中联重工科技发展股份有限公司 | Telescopic importing system and crane with same |
| CN202322115U (en) * | 2011-12-06 | 2012-07-11 | 中联重科股份有限公司 | Tower crane and balancing boom thereof |
| CN102491192A (en) * | 2011-12-15 | 2012-06-13 | 中联重科股份有限公司 | Tower crane introducing platform structure |
| CN103058070A (en) * | 2012-12-28 | 2013-04-24 | 徐州重型机械有限公司 | An introducing beam and a tower crane |
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| CN103171980A (en) | 2013-06-26 |
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