CN103145055B - Arm joint, truss arm and there is its hoisting crane - Google Patents
Arm joint, truss arm and there is its hoisting crane Download PDFInfo
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- CN103145055B CN103145055B CN201310073386.4A CN201310073386A CN103145055B CN 103145055 B CN103145055 B CN 103145055B CN 201310073386 A CN201310073386 A CN 201310073386A CN 103145055 B CN103145055 B CN 103145055B
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- 239000004020 conductor Substances 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims description 26
- 238000009434 installation Methods 0.000 abstract description 20
- 229910000831 Steel Inorganic materials 0.000 description 26
- 239000010959 steel Substances 0.000 description 26
- 238000000034 method Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 11
- 238000011900 installation process Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention provides a kind of arm joint, truss arm and there is its hoisting crane.Arm joint comprises: connecting hinge ear, second time connecting hinge ear and the conductor rope pulley for hold-down arm joint on connecting hinge ear on arm body, first, first time connecting hinge ear, second; On first, connecting hinge ear and first time connecting hinge ear are arranged on the first end of arm body; On second, connecting hinge ear and second time connecting hinge ear are arranged on the second end of arm body; Conductor rope pulley is arranged on the second end of the arm body of this arm joint.The truss arm in the present invention is used only to need to utilize the hoisting rope of hoisting crane just can realize Assembly &Disassembly, no longer need auxiliary hoist, thus reduce operation cost, improve installation effectiveness, have the advantages that occupied ground is little, structure is simple, easy to operate.
Description
Technical field
The present invention relates to crane field, more specifically, relate to a kind of arm joint, truss arm and there is its hoisting crane.
Background technology
The truss arm (can be fixing auxiliary and tower auxiliary usually) of hoisting crane (such as wheeled etc.) is the major part of expansion crane job height and scope, is widely used, frequently.
At present, most goliath, when the truss arm of Assembly &Disassembly self, all needs to have come by other auxiliary hoists.As shown in Figure 1, when installing or dismantle truss arm, needing saves land the arm of truss arm joint 10 1 joint one delivers to assigned address, after alignment pin holes, plugs bearing pin and fixes.During dismounting, first with auxiliary hoist, the arm of truss arm joint 10 is sling, after bearing pin of dismantling, arm joint is hung onto assigned address and deposits.Like this, not only time-consuming but also considerably increase the operation cost of manpower and materials, in installation and removal process, auxiliary hoist aside needs the workyard occupying certain area, and the requirement in place is also larger.
Summary of the invention
The present invention aims to provide the hoisting crane that a kind of structure is simple, easy to operate, can cut operating costs, improve the little arm joint of installation effectiveness, occupied ground, truss arm and have it.
For solving the problems of the technologies described above, according to a first aspect of the invention, provide a kind of arm joint, arm joint comprises: connecting hinge ear, second time connecting hinge ear and the conductor rope pulley for hold-down arm joint on connecting hinge ear on arm body, first, first time connecting hinge ear, second; On first, connecting hinge ear and first time connecting hinge ear are arranged on the first end of arm body; On second, connecting hinge ear and second time connecting hinge ear are arranged on the second end of arm body; Conductor rope pulley is arranged on the second end of the arm body of this arm joint, and arm joint also comprises the first hanging part, and the first hanging part is arranged between two top web members of the first end of the arm body of arm joint.
Further, arm joint also comprises second hanging part, and second hanging part is arranged on the lower web member of the first end of the arm body of arm joint.
Further, the first hanging part comprises two that arm-tie seat and compartment of terrain be arranged on arm-tie seat and draws ear, and the first end of arm-tie seat is connected with a top web member, and the second end of arm-tie seat is connected with another top web member.
Further, arm saves also to comprise and drags the portion of rolling, and drags the portion of rolling to be arranged on the downside of the second end of the arm body of arm joint.
Further, drag the portion of rolling to comprise two dragging of being connected with arm body and roll otic placode, drag the portion of rolling also to comprise to drag at two and roll cylinder between otic placode, cylinder is dragged by bearing pin and rolls otic placode with two and be connected pivotly.
According to a second aspect of the invention, provide a kind of truss arm, comprise the arm joint that multiple head and the tail successively connect, this arm joint is above-mentioned arm joint.
According to a third aspect of the present invention, provide a kind of hoisting crane, comprise truss arm, this truss arm is above-mentioned truss arm.
According to a fourth aspect of the present invention, provide a kind of installation method of truss arm of hoisting crane, above-mentioned truss arm is provided, comprises the following steps: step 1, the arm of truss arm to be installed joint is placed into successively the dead ahead of the principal arm of hoisting crane; Step 2, is connected the master winch steel rope of hoisting crane near principal arm primary importance that arm saves with by truss arm, and is upwards sling by this arm joint, and the first time connecting hinge ear saved to make this arm is connected pivotly with cutting with scissors under the arm head of principal arm after ear aligns; Step 3, connection between the primary importance that releasing master winch steel rope and arm save, the second place that master winch steel rope and arm save is connected, save to make arm and to rotate up and on arm save first, connecting hinge ear is connected with the arm head of principal arm cutting with scissors after ear aligns, thus arm to be saved and principal arm is permanently connected; Step 4, master winch steel rope is walked around the second end of mounted arm joint by conductor rope pulley after, the primary importance saved with next arm still uninstalled in truss arm is connected, and this next arm joint is upwards sling, be connected pivotly after aliging with second time connecting hinge ear that the arm installed saves to make first time connecting hinge ear of this next arm joint; Step 5, connection between the primary importance that releasing master winch steel rope and this next arm save, the second place that next to master winch steel rope and this arm saves is connected, to rotate up to make this next arm joint and on to make on first of this next arm joint that connecting hinge ear and the arm installed saves second, connecting hinge ear is connected after aliging, thus this next arm is saved to save with the arm installed and be permanently connected; Step 6, repeats step 4 and step 5, is installed to successively on principal arm by all still uninstalled arm joints.
Further, installation method also comprises: on the lower web member of the first end of the arm body of arm joint, install second hanging part, the primary importance in step 2 and step 4 is second hanging part.
Further, installation method also comprises: between two top web members of the first end of the arm body of arm joint, install the first hanging part, the second place in step 2 and step 4 is the first hanging part.
Further, installation method also comprises: install in the downside of the second end of the arm body of arm joint and drag the portion of rolling, saved by arm in the process of upwards slinging in step 2 and step 4, the second end of arm body contacts with ground surface by dragging the portion of rolling.
Therefore, the truss arm in the present invention is used only to need to utilize the hoisting rope of hoisting crane just can realize Assembly &Disassembly, no longer need auxiliary hoist, thus reduce operation cost, improve installation effectiveness, have the advantages that occupied ground is little, structure is simple, easy to operate.
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 scheme of installation of truss arm of the prior art;
Fig. 2 diagrammatically illustrates the front view of the truss arm in the present invention;
Fig. 3 diagrammatically illustrates the birds-eye view of the truss arm in the present invention;
Fig. 4 diagrammatically illustrates the scheme of installation of second hanging part;
Fig. 5 diagrammatically illustrates the partial top view of Fig. 4;
Fig. 6 diagrammatically illustrates the front view of the first hanging part;
Fig. 7 diagrammatically illustrates the partial top view of the first hanging part;
Fig. 8 diagrammatically illustrates the scheme of installation dragging the portion of rolling;
Fig. 9 diagrammatically illustrates the birds-eye view of Fig. 8;
Figure 10 diagrammatically illustrates the scheme of installation of conductor rope pulley;
Figure 11 diagrammatically illustrates the partial top view of Figure 10;
Figure 12 diagrammatically illustrates the installation process schematic diagram one of first arm joint;
Figure 13 diagrammatically illustrates the installation process schematic diagram two of first arm joint;
Figure 14 diagrammatically illustrates the installation process schematic diagram three of first arm joint;
Figure 15 diagrammatically illustrates the installation process schematic diagram one of second arm joint;
Figure 16 diagrammatically illustrates the installation process schematic diagram two of second arm joint;
Figure 17 diagrammatically illustrates the installation process schematic diagram one of whole truss arm;
Figure 18 diagrammatically illustrates the installation process schematic diagram two of whole truss arm;
Figure 19 diagrammatically illustrates the installation process schematic diagram three of whole truss arm;
Figure 20 diagrammatically illustrates the installation process schematic diagram four of whole truss arm;
Figure 21 diagrammatically illustrates the installation process schematic diagram five of whole truss arm; And
Figure 22 diagrammatically illustrates the installation process schematic diagram six of whole truss arm.
Reference numeral in figure: 10, arm joint; 11, arm body; 11a, lower web member; 11b, upper web member; 12, connecting hinge ear on first; 13, first time connecting hinge ear; 14, connecting hinge ear on second; 15, second time connecting hinge ear; 16, second hanging part; 16a, hanger; 17, the first hanging part; 17a, arm-tie seat; 17b, draw ear; 18, conductor rope pulley; 19, the portion of rolling is dragged; 19a, drag and roll otic placode; 19b, cylinder; 19c, bearing pin; 19d, brace panel; 20, principal arm; 30, master winch steel rope; 40, lug.
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 arm joint, especially, for the truss arm of hoisting crane.As depicted in figs. 1 and 2, this arm joint 10 comprises: connecting hinge ear 14, second time connecting hinge ear 15 and the conductor rope pulley 18 for hold-down arm joint 10 on connecting hinge ear 12, first time connecting hinge ear 13, second on arm body 11, first; On first, connecting hinge ear 12 and first time connecting hinge ear 13 are arranged on the first end of arm body 11; On second, connecting hinge ear 14 and second time connecting hinge ear 15 are arranged on second end (preferably, on the final section of arm body 11 on web member 11b) of arm body 11; Conductor rope pulley 18 is arranged on the second end of the arm body 11 of this arm joint 10.
During installation, the arm of truss arm to be installed joint 10 is placed into successively the dead ahead of the principal arm 20 of hoisting crane; Just the master winch steel rope 30 of hoisting crane is connected with by the primary importance saving 10 near principal arm 20 arm in truss arm again, and this arm joint 10 is upwards sling, the first time connecting hinge ear 13 saving 10 to make this arm with cut with scissors ear under the arm head of principal arm 20 and align after (as find that there is deviation, can adopt manually to save at ground pusher arm regulate) and connect pivotly.Then, releasing master winch steel rope 30 and arm save the connection between the primary importance of 10, the second place that master winch steel rope 30 and arm save 10 is connected, with make arm save 10 rotate up and make arm save 10 first on connecting hinge ear 12 be connected with the arm head of principal arm 20 cuts with scissors after ear aligns, thus arm is saved 10 and principal arm 20 be permanently connected.Next, after master winch steel rope 30 can being walked around the second end of mounted arm joint 10 by conductor rope pulley 18, the primary importance saving 10 with next arm still uninstalled in truss arm is connected, and this next arm joint 10 is upwards sling, be connected pivotly after aliging with the second time connecting hinge ear 15 making first time connecting hinge ear 13 of this next arm joint 10 and the arm installed save 10; Then, releasing master winch steel rope 30 and this next arm save the connection between the primary importance of 10, the second place that next to master winch steel rope 30 and this arm saves 10 is connected, rotate up to make this next arm joint 10 and make connecting hinge ear 12 and the arm installed on first of this next arm joint 10 save 10 second on connecting hinge ear 14 align after be connected, thus this next arm is saved 10 and the arm installed save 10 and be permanently connected.If circulation, all still uninstalled arm joints can be installed on principal arm 20 successively.
Therefore, the truss arm in the present invention is used only to need the master winch steel rope utilizing hoisting crane just can realize Assembly &Disassembly, no longer need auxiliary hoist, thus reduce operation cost, improve installation effectiveness, have the advantages that occupied ground is little, structure is simple, easy to operate.
Preferably, as shown in Figure 1, Figure 2, shown in Fig. 4 and Fig. 5, arm joint 10 also comprises hanging part 16,16, second, second hanging part and is arranged on the lower web member of the first end of the arm body 11 of this arm joint 10.Especially, second hanging part 16 is used as above-mentioned primary importance, and the free end of master winch steel rope 30 is connected with second hanging part 16, like this, second hanging part 16 can be utilized upwards to be mentioned by arm joint 10.Please refer to Fig. 4 and Fig. 5, preferably, second hanging part 16 comprises two hanger 16a, and these two are hung lower 16a compartment of terrain and arrange, and are all connected with the lower web member 11a of hoisting crane.
Preferably, as shown in Figure 1, Figure 2, shown in Fig. 6 and Fig. 7, arm joint 10 also comprises the first hanging part 17, and the first hanging part 17 is arranged between two top web members of the first end of the arm body 11 of this arm joint 10.Preferably, as shown in Figure 6 and Figure 7, the first hanging part 17 comprises two that arm-tie seat 17a and compartment of terrain be arranged on arm-tie seat 17a and draws ear 17b, and the first end of arm-tie seat 17a is connected with a top web member, and second end of arm-tie seat 17a is connected with another top web member.Preferably, arm-tie seat 17a is arranged along the bearing of trend of arm body 11.
Obviously, master winch steel rope 30 also differs is could must be connected with arm body 11 with the first hanging part 17 by second hanging part 16.To those skilled in the art, even directly by two lifting ropes, the chord member of master winch steel rope 30 with the both sides of arm body 11 can be connected, or directly be connected with its web member.By contrast, employing second hanging part 16 and the first hanging part 17 can ensure balance when lifting by crane.
Preferably, as shown in Figure 1, Figure 2, shown in Fig. 8 and Fig. 9, arm joint 10 also comprises and drags the portion of rolling 19, drags the portion of rolling 19 to be arranged on the downside of the second end of the arm body 11 of this arm joint 10.In the process of lifting arm joint, the first end of arm joint is pulled upwardly by master winch steel rope 30, its second end and earth surface.Therefore, the second end can be saved to arm by dragging the portion of rolling 19 and protect, make therebetween relative motion in a rolling manner, avoid damaging in the process dragged the second end of arm joint.In addition, the portion of rolling 19 is dragged also when finely tuning hole, truss arm can be promoted artificially and move in luffing plane.Preferably, arm joint 10 comprises two and spacedly drags the portion of rolling 19, and like this, two are dragged the portion of rolling 19 to be distributed in both sides on last root web member of truss arm rear end, can avoid interfering with first of the truss arm that is connected time connecting hinge ear.
Preferably, as shown in Figure 8 and Figure 9, drag the portion of rolling 19 to comprise two dragging of being connected with arm body 11 and roll otic placode 19a, drag the portion of rolling 19 also to comprise to drag at two and roll cylinder 19b between otic placode 19a, cylinder is dragged by bearing pin 19c and rolls otic placode 19a with two and be connected pivotly.Preferably, drag the portion of rolling 19 also to comprise brace panel 19d, brace panel 19d is separately positioned on two and drags the outside of rolling otic placode 19a, and rolls otic placode 19a and web member 11a is connected with dragging respectively, thus strengthens the intensity of dragging the portion of rolling 19.Preferably, the diameter of cylinder 19b will reach greatly, with ensure truss arm rear end structure all the time not with earth surface.
Preferably, please refer to Figure 10 and Figure 11, conductor rope pulley 18 is pivotably mounted on the second end that arm saves the arm body 11 of 10, to guide master winch steel rope 30 by the lug 40 that two are connected with upper web member 11b.
As a second aspect of the present invention, provide a kind of truss arm, comprise the arm joint 10 that multiple head and the tail successively connect, this arm joint 10 is above-mentioned arm joints.Especially, adjacent two arms joint 10 is removably connected by connecting hinge ear 14, second time connecting hinge ear 15 on second of connecting hinge ear 12, first time connecting hinge ear 13 on first of arm joint 10 in this adjacent two arms joint 10 and another arm joint 10.
As a third aspect of the present invention, provide a kind of hoisting crane, comprise truss arm, this truss arm is above-mentioned truss arm.
As a fourth aspect of the present invention, provide a kind of installation method of truss arm of hoisting crane, please refer to Figure 12 to Figure 22, provide above-mentioned truss arm, this installation method comprises the following steps:
Step 1, as shown in figure 17, is placed into the dead ahead of the principal arm 20 of hoisting crane successively by the arm of truss arm to be installed joint 10;
Step 2, as Figure 12 to Figure 13 and Figure 18, the master winch steel rope 30 of hoisting crane is connected with by the primary importance saving 10 near principal arm 20 arm in truss arm, and this arm joint 10 is upwards sling, the first time connecting hinge ear 13 saving 10 to make this arm is connected pivotly with cutting with scissors after ear aligns under the arm head of principal arm 20;
Step 3, releasing master winch steel rope 30 and arm save the connection between the primary importance of 10, the second place that master winch steel rope 30 and arm save 10 is connected, with make arm save 10 rotate up and make arm save 10 first on connecting hinge ear 12 be connected with the arm head of principal arm 20 cuts with scissors after ear aligns, thus arm is saved 10 and principal arm 20 be permanently connected (as Figure 14 and Figure 19);
Step 4, please refer to Figure 15, Figure 16, Figure 20 and Figure 21, master winch steel rope 30 is walked around the second end of mounted arm joint 10 by conductor rope pulley 18 after, the primary importance saving 10 with next arm still uninstalled in truss arm is connected, and this next arm joint 10 is upwards sling, be connected pivotly after aliging with the second time connecting hinge ear 15 making first time connecting hinge ear 13 of this next arm joint 10 and the arm installed save 10;
Step 5, releasing master winch steel rope 30 and this next arm save the connection between the primary importance of 10, the second place that next to master winch steel rope 30 and this arm saves 10 is connected, rotate up to make this next arm joint 10 and make connecting hinge ear 12 and the arm installed on first of this next arm joint 10 save 10 second on connecting hinge ear 14 align after be connected, thus this next arm is saved 10 and the arm installed save 10 and be permanently connected;
Step 6, please refer to Figure 22, repeats step 4 and step 5, is installed to successively on principal arm 20 by all still uninstalled arm joints.
Preferably, installation method also comprises: on the lower web member of the first end of the arm body 11 of arm joint 10, install second hanging part 16, the primary importance in step 2 and step 4 is second hanging part.
Preferably, installation method also comprises: between two top web members of the first end of the arm body 11 of arm joint 10, install the first hanging part 17, the second place in step 2 and step 4 is the first hanging part.
Preferably, installation method also comprises: install in the downside of the second end of the arm body 11 of arm joint 10 and drag the portion of rolling 19, and in the process of upwards being sling by arm joint 10 in step 2 and step 4, the second end of arm body 11 contacts with ground surface by dragging the portion of rolling 19.
Truss arm in the present invention only need by increasing the conductor rope pulley 18 be attached on truss arm from dismounting, without the need to other instrument, can realize by means of only master winch steel rope (especially, containing pocket type fag end) truss arm one saved one and to save land installation or removal, thus reach the object reducing operation cost to greatest extent.Meanwhile, because method simple practical also substantially increases dismounting efficiency.Without the need to considering putting of auxiliary hoist, more reduce the requirement to fabricating yard.
These are 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 (7)
1. an arm joint, it is characterized in that, described arm joint (10) comprising: connecting hinge ear (14), second time connecting hinge ear (15) and the conductor rope pulley (18) for installing described arm joint (10) on connecting hinge ear (12) on arm body (11), first, first time connecting hinge ear (13), second;
On described first, connecting hinge ear (12) and described first time connecting hinge ear (13) are arranged on the first end of described arm body (11); On described second, connecting hinge ear (14) and described second time connecting hinge ear (15) are arranged on the second end of described arm body (11);
Described conductor rope pulley (18) is arranged on the second end of the arm body (11) of arm joint (10) described in this;
Described arm joint (10) also comprises the first hanging part (17), and described the first hanging part (17) is arranged between two top web members of the first end of the arm body (11) of described arm joint (10).
2. arm joint according to claim 1, it is characterized in that, described arm joint (10) also comprises second hanging part (16), and described second hanging part (16) is arranged on the lower web member of the first end of the arm body (11) of described arm joint (10).
3. arm joint according to claim 1, it is characterized in that, described the first hanging part (17) comprises two that arm-tie seat (17a) and compartment of terrain be arranged on described arm-tie seat (17a) and draws ear (17b), the first end of described arm-tie seat (17a) is connected with a described top web member, and the second end of described arm-tie seat (17a) is connected with top web member described in another.
4. arm joint according to claim 1, it is characterized in that, described arm joint (10) also comprises and drags the portion of rolling (19), described in drag the portion of rolling (19) to be arranged on the downside of the second end of the arm body (11) of described arm joint (10).
5. arm joint according to claim 4, it is characterized in that, describedly drag the portion of rolling (19) to comprise two dragging of being connected with described arm body (11) to roll otic placode (19a), describedly drag the portion of rolling (19) also to comprise to be positioned at described two to drag and roll cylinder (19b) between otic placode (19a), described cylinder is rolled otic placode (19a) by bearing pin (19c) and is connected pivotly with dragging described in two.
6. a truss arm, comprises arm joint (10) that multiple head and the tail successively connect, it is characterized in that, described arm joint (10) is the arm joint according to any one of claim 1 to 5.
7. a hoisting crane, comprises truss arm, it is characterized in that, described truss arm is truss arm according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310073386.4A CN103145055B (en) | 2013-03-07 | 2013-03-07 | Arm joint, truss arm and there is its hoisting crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310073386.4A CN103145055B (en) | 2013-03-07 | 2013-03-07 | Arm joint, truss arm and there is its hoisting crane |
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| CN103145055A CN103145055A (en) | 2013-06-12 |
| CN103145055B true CN103145055B (en) | 2016-02-10 |
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| CN201310073386.4A Active CN103145055B (en) | 2013-03-07 | 2013-03-07 | Arm joint, truss arm and there is its hoisting crane |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108545629B (en) * | 2018-06-26 | 2019-08-16 | 中建二局第二建筑工程有限公司 | Utilize the construction method of tower crane lifting girder truss |
| CN109305627A (en) * | 2018-11-08 | 2019-02-05 | 河南省盛华重型起重机有限公司 | A kind of movably connected web member girder for crane |
| CN113148872B (en) * | 2021-03-24 | 2023-07-14 | 上海宏英智能科技股份有限公司 | Crane boom assembly sequence identification device and identification method |
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| CN202322105U (en) * | 2011-11-04 | 2012-07-11 | 三一汽车起重机械有限公司 | Crane and device for installing auxiliary boom of crane |
| CN102897677A (en) * | 2012-09-24 | 2013-01-30 | 三一重工股份有限公司 | Crane fly jib self-assembly and disassembly device and method, as well as crane |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2853891B1 (en) * | 2003-04-17 | 2006-05-19 | Potain Sa | DEVICE FOR THE DISASSEMBLY OF THE ELEMENTS OF A TOWER CRANE |
| DE102009010452A1 (en) * | 2009-02-26 | 2010-09-02 | Terex-Demag Gmbh | Method and device for mounting and dismounting an attachment on the main boom of a mobile crane |
| US8739988B2 (en) * | 2010-09-20 | 2014-06-03 | Manitowoc Crane Companies, Llc | Pinned connection system for crane column segments |
| CN202245839U (en) * | 2011-08-17 | 2012-05-30 | 三一汽车起重机械有限公司 | Crane and auxiliary arm mounting device thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202322105U (en) * | 2011-11-04 | 2012-07-11 | 三一汽车起重机械有限公司 | Crane and device for installing auxiliary boom of crane |
| CN102897677A (en) * | 2012-09-24 | 2013-01-30 | 三一重工股份有限公司 | Crane fly jib self-assembly and disassembly device and method, as well as crane |
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