CN105366568A - Combined type arm frame and hoisting equipment - Google Patents
Combined type arm frame and hoisting equipment Download PDFInfo
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- CN105366568A CN105366568A CN201510946099.9A CN201510946099A CN105366568A CN 105366568 A CN105366568 A CN 105366568A CN 201510946099 A CN201510946099 A CN 201510946099A CN 105366568 A CN105366568 A CN 105366568A
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- jib
- basic
- compound type
- web members
- link span
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/03—Cranes with arms or jibs; Multiple cranes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
The invention relates to a combined type arm frame and hoisting equipment. The combined type arm frame comprises multiple basic arm frames, at least every two basic arm frames are combined into an arm frame unit through a detachable connecting mode in the height direction, and all the arm frame units are combined into the integral arm frame through a detachable connecting mode in the length direction. According to the combined-type arm frame, through combination of at least every two basic arm frames in the height direction, the section of an arm frame system is increased, and the bearing capacity of the arm frame is improved; meanwhile, the upper basic arm frames and the lower basic arm frames in the height direction can be separately transported during transportation, the problems of being limited by transportation size and transportation weight in the arm frame system are solved.
Description
Technical field
The present invention relates to engineering machinery field, particularly relate to a kind of compound type jib and weight-lifting equipment.
Background technology
For meeting the lifting demand to oversized equipment in the Larger Engineering Projects such as domestic petroleum, petrochemical industry, nuclear power, ocean engineering, wind-powered electricity generation, iron and steel, hoisting crane is more and more to ultra-large type development, and lifting altitude is higher, and work range is larger, and load-carrying ability is stronger.Ultra-large type weight-lifting equipment is a kind of hoisting crane of new model, and have hoisting capacity and hoisting moment large, the advantage that grounding pressure is little, is often used in the occasion that hoisting capacity is larger.Along with the fast development of international energy and chemical field, the construction of super large part is more and more.
Boom system is as the key construction part of weight-lifting equipment, and its version and the load-carrying capacity of self have important impact to the ease of use of weight-lifting equipment and load-carrying capacity.As shown in Fig. 1 (a), Fig. 1 (b), the general jib structure form of weight-lifting equipment generally adopts the truss structure by four main chords 1 ' and the welding of some web members 2 '.From stressed aspect, jib belongs to bi-axial bending moment, namely when weight-lifting equipment hangs the work of carrying, jib all bears the effect of axial force and moment of flexure in luffing plane and plane of rotation, therefore, from telescopic boom section analysis, need enough sectional areas, to ensure telescopic boom section intensity, thus the effect of opposing axial force; Need enough section width B and height H to ensure the moment of inertia in two planes, thus the effect of resist torque.In order to improve the load-carrying capacity of jib, need to increase the specification of main chord and the sectional dimension of jib, and the height-width restriction of over-the-road transportation seriously governs the increase in its cross section, therefore, the load-carrying capacity that jib is enough should be ensured, meet transportation clearance requirement again, how solving this becomes to contradiction the key issue that weight-lifting equipment develops to ultra-large type.
Combined type main chord (as Suo Shi Fig. 2 (a)) has been there is in prior art, namely by the original main chord of array mode replacement of two main chords 1 ' (as shown in Fig. 2 (b) and Fig. 2 (c)), three main chord 1 ' (as Suo Shi Fig. 2 (d)), four main chords 1 ' (as Suo Shi Fig. 2 (e)) or more main chords, by web member, web or be directly welded to connect between each main chord.
There is following problem in said arm frame system:
1) increase that the sectional dimension of boom system and material specification can not be unlimited by transportation clearance and domestic shipping weight restriction; Improve material and increase cost, higher to material oneself requirement, and it is limited to the lifting of boom system load-carrying capacity to improve material;
2) combined type main-chord arm support system, arm joint self structure complex forms, requires higher to frock and spelling point;
3) combined type main-chord arm support system, connects by Type of Welding between each main chord, and butt welded seam requires higher, and weld defect checks that difficulty is more complicated, there is certain potential safety hazard;
4) combined type main-chord arm support system is one overall between each main chord, and by transport heavy quantitative limitation, the quantity of main chord can not unconfined increase, thus the load-carrying capacity of boom system self also promote limited;
5) weight of boom system self can affect the lifting performance of weight-lifting equipment, combined type main-chord arm support system, it is a welding integral between each main chord, web member, himself weight cannot lift demand according to reality and lifting condition regulates, the weight of self cannot reach good mating with overall performance, even can make the hydraulic performance decline of complete machine;
6) combined type main-chord arm support system, it is a welding integral between each main chord, web member, himself load-carrying capacity cannot lift demand according to reality and lifting condition regulates, the load-carrying capacity of self cannot lift weight with reality and reach good mating, and there will be the waste situation that surplus capacity is larger;
7) combined type main-chord arm support system, it is a welding integral between each main chord, web member, himself load-carrying capacity cannot lift demand according to reality and lifting condition regulates, the load-carrying capacity of self cannot require to reach good mating with weight-lifting equipment overall performance, there will be the waste situation that boom system load-carrying capacity surplus is larger;
8) combined type main-chord arm support system is a welding integral between each main chord, web member, once weight-lifting equipment will carry out performance boost improvement, boom system improves more difficult, even cannot improve, boom system and overall performance not matched, affects the performance boost of machine system.
Below the technical term related in the present invention is made an explanation:
Ultra-large type weight-lifting equipment: be that one can realize hoisting, luffing, revolution action, the equipment of lifting performance super large.
Boom system: a kind of to be used for heavy lift, to certain altitude and amplitude, can bear the space four limbs truss structure of axial force and moment of flexure.
Luffing plane: jib and the determined plane of luffing arm-tie are called luffing range of cantilever support plane, in luffing plane, jib is analyzed as the mechanical model of two ends freely-supported.
Plane of rotation: parallel ground and be called jib plane of rotation with the plane of luffing plane orthogonal, in plane of rotation, jib as one end fix one end freely mechanical model analyze.
Summary of the invention
The object of the invention is to propose a kind of compound type jib and weight-lifting equipment, it can either improve load-carrying capacity, the problem limited by transportation clearance and domestic shipping weight when solving again transport.
For achieving the above object, the invention provides a kind of compound type jib, it comprises multiple basic jib, be combined into jib unit by detouchable connection mode at short transverse Connecting groups between at least two described basic jibs, multiple described jib unit is combined into overall jib by detouchable connection mode at length direction Connecting groups.
One preferably or in embodiment, described basic jib comprises two main chords be arranged in parallel, many web members are connected between two described main chords, two described main chords are equipped with multiple link span, described link span is formed by connecting by least two web members, and described link span is provided with the connecting portion that can realize removably connecting.
One preferably or in embodiment, described jib unit comprises two described basic jibs, wherein the multiple described connecting portion of basic jib described in is corresponding is connected with the multiple described connecting portion of jib basic described in another.
One preferably or in embodiment, wherein the end of basic jib described in is connected by the connecting portion on described link span with the end of jib basic described in another, or, connected by connecting rod.
One preferably or in embodiment, described jib unit comprises two described basic jibs and a reinforcement jib, and the both sides of described reinforcement jib short transverse connect basic jib described in respectively.
One preferably or in embodiment, described reinforcement jib is the truss structure comprising four main chords and Duo Gen web member, and the both sides of described reinforcement jib short transverse are equipped with multiple connection otic placode for removably connecting.
One preferably or in embodiment, described link span comprises three web members, and one end of three described web members is connected to described main chord, and the other end of three described web members is all connected to the connecting portion described in this corresponding to link span.
One preferably or in embodiment, described link span comprises two root web members, and one end of two described web members is connected to described main chord, and the other end of two described web members is all connected to the connecting portion described in this corresponding to link span.
Preferably or in embodiment, between described basic jib, and detachable connection is realized by bearing pin or bolt between described jib unit one.
For achieving the above object, the invention provides a kind of weight-lifting equipment, it comprises the compound type jib in above-mentioned any embodiment.
Based on technique scheme, the present invention at least has following beneficial effect:
Compound type jib provided by the invention is by the combination of at least two basic jibs in short transverse, the cross section of boom system is increased, the load-carrying capacity of jib gets a promotion, when transporting simultaneously, upper and lower two basic jibs in short transverse can separate and transport separately, solve the difficult problem by transportation clearance and domestic shipping weight restriction in boom system.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, 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 (a) is the schematic front view of weight-lifting equipment jib structure of the prior art;
Fig. 1 (b) is the schematic side view of weight-lifting equipment jib structure of the prior art;
The schematic diagram of Fig. 2 (a) combined type main-chord arm support of the prior art structure;
Fig. 2 (b) ~ Fig. 2 (e) is the A-A schematic cross-section of Fig. 2 (a) varying number main chord embodiment;
Fig. 3 is the schematic diagram of the first embodiment of jib unit provided by the invention;
Fig. 4 is the jib unit disassembled state schematic diagram shown in Fig. 3;
Fig. 5 is the jib unit assembling effect schematic diagram of two shown in Fig. 3;
Fig. 6 is the schematic diagram of the second embodiment of jib unit provided by the invention;
Fig. 7 is the structural representation of reinforcement jib provided by the invention;
Fig. 8 is the jib unit disassembled state schematic diagram shown in Fig. 6;
Fig. 9 is the jib unit assembling effect schematic diagram of two shown in Fig. 6;
Figure 10 is the perspective view of compound type jib provided by the invention.
Attached number in the figure:
1 '-main chord; 2 '-web member;
The basic jib of 1-; 2-strengthens jib; 3-main chord; 4-link span; 5-connecting portion; 6-connecting rod; 7-web member; 8-connects otic placode;
10-jib unit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
Along with the fast development of international energy and chemical engineering construction field, in engineering, modularization, maximization and integrated lifting requirements improve constantly, and have higher requirement to weight-lifting equipment hoisting capacity and hoisting moment.Boom system is as the main bearing member of weight-lifting equipment, and the characteristic such as version, load-carrying capacity of himself directly affects in-use performance and the lifting performance of complete machine.
Compound type jib provided by the invention, demand and lifting condition can be lifted according to reality, optionally combine jib, and then improve rigidity and the resistance to bending of whole boom system, effectively improve stability and the stressing conditions of boom system, improve the load-carrying capacity of jib self, thus improve the load capacity of weight-lifting equipment.
As shown in Figure 3, for the illustrative examples of compound type jib provided by the invention, in this illustrative examples, compound type jib comprises multiple basic jib 1, be combined into jib unit 10 by detouchable connection mode at short transverse Connecting groups between at least two basic jibs 1, multiple jib unit 10 is combined into overall jib (as shown in Fig. 5, Fig. 9, Figure 10) by detouchable connection mode at length direction Connecting groups.
Compound type jib provided by the invention is by the combination of at least two basic jibs 1 in short transverse, the cross section of boom system is increased, the load-carrying capacity of jib gets a promotion, when transporting simultaneously, upper and lower two basic jibs 1 in short transverse can separate and transport separately, solve the difficult problem by transportation clearance and domestic shipping weight restriction in boom system.
As shown in Figure 4, for the disassembled state of two basic jibs 1 provided by the invention, basic jib 1 can adopt various structures form, basic jib 1 shown in Fig. 4 is an illustrative examples of basic jib 1 provided by the invention, in this illustrative examples, basic jib 1 can comprise two main chords be arranged in parallel 3, many web member (not shown)s are connected between two main chords 3, two main chords 3 are equipped with multiple link span 4, link span 4 can be formed by connecting by least two web members, link span 4 is provided with the connecting portion 5 that can realize removably connecting.
The truss structure that the structure of basic jib 1 provided by the invention is welded compared to four main chords and Duo Gen web member in prior art, can save two main chords 3, therefore, it is possible to reduce the weight of basic jib 1.
One preferably or in embodiment, link span 4 can be triangular structure, and it can comprise three web members, and one end of three web members is connected to main chord 3, the other end of three web members is all connected to this connecting portion 5 corresponding to link span 4.
At another preferably or in embodiment, link span 4 can comprise two web members, and one end of two web members is connected to main chord 3, the other end of two web members is all connected to this connecting portion 5 corresponding to link span 4.
The link span 4 that the link span 4 basic jib 1 shown in Fig. 4 being both provided with three web members formation also has two web members to be formed, wherein, the link span 4 of two web member formation can be positioned at the end of basic jib 1, for being connected with the link span 4 on other basic jibs 1.
Basic jib 1 in above-described embodiment can adopt multiple combination mode to form jib unit 10.
As shown in Figure 3, for the first embodiment of jib unit 10 provided by the invention, in a first embodiment, jib unit 10 can comprise two basic jibs 1, and wherein multiple connecting portions 5 correspondence of a basic jib 1 is connected with multiple connecting portions 5 of another basic jib 1.And wherein the end of a basic jib 1 can be connected by the connecting portion 5 on link span 4 with the end of another basic jib 1, or connected by connecting rod 6.
In the first embodiment of the jib unit 10 shown in Fig. 3, one end of two basic jibs 1 is connected by the connecting portion 5 on link span 4, and the other end of two basic jibs 1 is connected by connecting rod 6.
As shown in Figure 4, when under two basic jib 1 disassembled states, two basic jibs 1 can be transported separately, make it meet the requirement of transportation clearance and domestic shipping weight.
Oad and the weight of basic jib 1 provided by the invention all meet transportation request, jib unit 10 can be connected into by connecting portion 5 and connecting rod 6 between upper and lower two basic jibs 1, the sectional dimension of jib unit 10 is significantly promoted, and the load-carrying capacity of boom system is effectively promoted.
As shown in Figure 5, combination can be connected by detouchable connection mode along its length between two jib unit 10 provided by the invention.
As shown in Figure 6, be the second embodiment of jib unit 10 provided by the invention, in a second embodiment, jib unit 10 can comprise two basic jibs 1 and a reinforcement jib 2, and the both sides strengthening jib 2 short transverse connect a basic jib 1 respectively.
As shown in Figure 7, strengthen jib 2 and can adopt existing jib structure.Such as: strengthening jib 2 can be comprise the truss structure that four main chords 3 and Duo Gen web member 7 be welded, the both sides strengthening jib 2 short transverse are equipped with multiple connection otic placode 8 for removably connecting, be specially and on upper and lower main chord 3, be welded with connection otic placode 8, for being connected with the connecting portion 5 of basic jib 1.
In order to the load-carrying capacity of lift arm frame system further, the invention provides the second embodiment of jib unit 10, by the combination of two basic jibs 1 and a reinforcement jib 2, telescopic boom section is increased further, and the load-carrying capacity of boom system is promoted further.
Fig. 8 be the second embodiment of jib unit 10 provided by the invention take effect schematic diagram apart, two basic jibs 1 and strengthen jib 2 and take independent transport apart during transport, make it meet the requirement of transportation clearance and domestic shipping weight in boom system.
Strengthen jib 2 to use as the less auxiliary of complete machine load-carrying capacity or the less weight-lifting equipment boom system of other hoisting capacities simultaneously, the degree of utilization of boom system is improved, cost-saving.
Fig. 9, Figure 10 shows that two jib unit 10 provided by the invention the second embodiment in the longitudinal direction Connecting groups be combined into overall jib.
Jib unit 10 provided by the invention can adopt reinforcement jib 2 build-up type of basic the jib 1 and traditional truss structure newly increased to be connected, and can not increase sectional dimension and the weight of traditional jib, can meet the requirement of transportation clearance and weight; The basic jib 1 and the traditional jib that newly increase are build-up type relations, demand can be lifted and lifting condition optionally increases compound type jib according to reality, make the weight of boom system self and load-carrying capacity reach Proper Match, and reach optimum assembly with the performance of complete machine.
In each embodiment above-mentioned, between basic jib 1, between basic jib 1 and reinforcement jib 2, and the mode of removably connecting between jib unit 10 can by arranging connection otic placode, realize by plugging bearing pin, and connection is not limited to pinned connection, also can be other types of attachment that bolt connection etc. reaches the object of the invention.
In each embodiment above-mentioned, the main chord 3 in compound type jib can adopt pipe form, equally also can adopt square tube, rectangular tube or other shape tube etc.
Compound type jib provided by the invention increases by one group and strengthens jib 2, equally, in order to the load-carrying capacity strengthening jib self also can adopt the array configuration of more multi-layered compound type jib between two basic jibs 1.
Weight-lifting equipment provided by the invention, it comprises the compound type jib in above-mentioned any embodiment.Compound type jib provided by the invention is particularly useful for ultra-large type weight-lifting equipment.
By the description of each embodiment above-mentioned, compound type jib provided by the invention can be summed up and at least have the following advantages:
1) compound type jib makes the transportation clearance of boom system and domestic shipping weight no longer become the factor of constraint boom system own wt, self-bearing capacity, and the self-bearing capacity of boom system is promoted at double;
2) compound type jib structure form is simple, greatly reduces frock and production difficulty;
3) himself weight of compound type jib can lift demand according to reality and lifting condition regulates, and the weight of boom system self and overall performance can be made to reach good mating, be unlikely to the performance having influence on complete machine;
4) himself load-carrying capacity of compound type jib can lift demand according to reality and lifting condition regulates, and the load-carrying capacity of self can lift weight with reality and reach good mating, and the degree of utilization of boom system load-carrying capacity is improved;
5) himself load-carrying capacity of compound type jib can lift demand according to reality and lifting condition regulates, self load-carrying capacity can reach good mating with the overall performance of wherein equipment, makes the performance of overall performance and arm joint system self obtain good utilization;
6) in compound type boom system, the specification of single main chord reduces than the specification of an original main chord, and its blanking difficulty of processing reduces greatly, also makes the performance utilization rate of main chord self be improved;
7) boom system that the reinforcement jib in compound type jib can be used for the little weight-lifting equipment that auxiliary uses or other load-carrying capacitys are little of the heavy load-carrying capacity of complete machine uses, and the overall utilization rate of boom system improves, cost-saving;
8) when weight-lifting equipment carries out performance boost improvement, only need change the larger reinforcement jib of another sectional dimension or increase by one group again and strengthen jib, performance boost improvement is simple, cost is low.
In sum, the Design Thinking of boom system in the past broken by compound type jib provided by the invention, overall for welded type jib become build-up type compound type jib, makes boom system no longer by the restriction such as transportation clearance, domestic shipping weight; Can also use as the less Auxiliary arm system of complete machine load-carrying capacity or the little boom system of other load-carrying abilitys for the build-up type jib strengthened simultaneously, the Occupation coefficient of whole boom system is improved.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (10)
1. a compound type jib, it is characterized in that: comprise multiple basic jib (1), be combined into jib unit (10) by detouchable connection mode at short transverse Connecting groups between at least two described basic jibs (1), multiple described jib unit (10) is combined into overall jib by detouchable connection mode at length direction Connecting groups.
2. compound type jib as claimed in claim 1, it is characterized in that: described basic jib (1) comprises two main chords be arranged in parallel (3), many web members are connected between two described main chords (3), two described main chords (3) are equipped with multiple link span (4), described link span (4) is formed by connecting by least two web members, and described link span (4) is provided with the connecting portion (5) that can realize removably connecting.
3. compound type jib as claimed in claim 2, it is characterized in that: described jib unit (10) comprises two described basic jibs (1), wherein multiple described connecting portion (5) correspondence of basic jib (1) described in is connected with the multiple described connecting portion (5) of jib (1) basic described in another.
4. compound type jib as claimed in claim 3, it is characterized in that: wherein the end of basic jib (1) described in is connected by the connecting portion (5) on described link span (4) with the end of jib (1) basic described in another, or, connected by connecting rod (6).
5. compound type jib as claimed in claim 2, it is characterized in that: described jib unit (10) comprises two described basic jibs (1) and a reinforcement jib (2), the both sides of described reinforcement jib (2) short transverse connect basic jib (1) described in respectively.
6. compound type jib as claimed in claim 5, it is characterized in that: described reinforcement jib (2) is the truss structure comprising four main chords (3) and many web members, the both sides of described reinforcement jib (2) short transverse are equipped with multiple connection otic placode (8) for removably connecting.
7. compound type jib as claimed in claim 2, it is characterized in that: described link span (4) comprises three web members, one end of three described web members is connected to described main chord (3), and the other end of three described web members is all connected to the connecting portion (5) corresponding to link span described in this (4).
8. compound type jib as claimed in claim 2, it is characterized in that: described link span (4) comprises two root web members, one end of two described web members is connected to described main chord (3), and the other end of two described web members is all connected to the connecting portion (5) corresponding to link span described in this (4).
9. compound type jib as claimed in claim 1, is characterized in that: between described basic jib (1), and realize detachable connection by bearing pin or bolt between described jib unit (10).
10. a weight-lifting equipment, is characterized in that: comprise the compound type jib as described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510946099.9A CN105366568A (en) | 2015-12-17 | 2015-12-17 | Combined type arm frame and hoisting equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510946099.9A CN105366568A (en) | 2015-12-17 | 2015-12-17 | Combined type arm frame and hoisting equipment |
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| CN105366568A true CN105366568A (en) | 2016-03-02 |
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| CN201510946099.9A Pending CN105366568A (en) | 2015-12-17 | 2015-12-17 | Combined type arm frame and hoisting equipment |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0609998A1 (en) * | 1993-02-04 | 1994-08-10 | The Manitowoc Company, Inc. | Transport means for a longitudinally divisible crane boom segment |
| CN104150378A (en) * | 2014-06-27 | 2014-11-19 | 浙江三一装备有限公司 | Truss arm structure and engineering machine |
| CN205312931U (en) * | 2015-12-17 | 2016-06-15 | 徐工集团工程机械股份有限公司 | Modular cantilever crane and hoisting equipment |
-
2015
- 2015-12-17 CN CN201510946099.9A patent/CN105366568A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0609998A1 (en) * | 1993-02-04 | 1994-08-10 | The Manitowoc Company, Inc. | Transport means for a longitudinally divisible crane boom segment |
| CN104150378A (en) * | 2014-06-27 | 2014-11-19 | 浙江三一装备有限公司 | Truss arm structure and engineering machine |
| CN205312931U (en) * | 2015-12-17 | 2016-06-15 | 徐工集团工程机械股份有限公司 | Modular cantilever crane and hoisting equipment |
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Application publication date: 20160302 |