CN110510533A - A kind of double tube tracking conveying mechanism - Google Patents
A kind of double tube tracking conveying mechanism Download PDFInfo
- Publication number
- CN110510533A CN110510533A CN201910796055.0A CN201910796055A CN110510533A CN 110510533 A CN110510533 A CN 110510533A CN 201910796055 A CN201910796055 A CN 201910796055A CN 110510533 A CN110510533 A CN 110510533A
- Authority
- CN
- China
- Prior art keywords
- oil pipe
- pulley
- wire rope
- sliding block
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 32
- 239000000446 fuel Substances 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 96
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
-
- 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
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
- Manipulator (AREA)
Abstract
The invention discloses a kind of double tubes to track conveying mechanism, and slide block mechanism is arranged between two joint arms and three joint arms between a joint arm and two joint arms, and slide block mechanism includes sliding block, and the first oil pipe pulley, the second oil pipe pulley are fixed on sliding block, and opposing slider rotates；The first steel wire rope component is respectively set at sliding block both ends, second steel wire rope component, first wire rope pulley of the first steel wire rope component, second wire rope pulley of the second steel wire rope component is separately fixed at the both ends of sliding block, and opposing slider rotates, the both ends of first wirerope around the first wire rope pulley respectively with a joint arm oral area, two joint arm oral areas are connected, the both ends of second wirerope around the second wire rope pulley respectively with a joint arm tail portion, two joint arm tail portions are connected, tracking oil tube conveying mechanism can be to I # oil cylinder, 1 grade of cylinder, I 2 grades of # oil cylinder cylinder and II # oil cylinder difference fuel feeding or any combination fuel feeding, enable every section telescopic arm independent telescope of crane, to make telescopic arm carry out operation in any brachium.
Description
Technical field
The present invention relates to crane technical field, the double tube of especially a kind of telescopic arm tracks conveying mechanism.
Background technique
With industrial expansions such as building installation engineering and national defence, telescopic arm structure has obtained widely in engineering practice
With.It the advantage is that, it has biggish bearing capacity when by a small margin, has again under the load situation of permission longer
Operation distance and higher operation height.Telescopic arm structure is chiefly used on engineering truck or other means of transports.
Six joint arm autocranes, current most of manufacturers are all made of single-cylinder bolt technology and carry out stretching for telescopic arm
Contracting can effectively improve lifting performance its main feature is that flexible arm assembly is light-weight, but the disadvantage is that contraction time is too long, cause to make
Industry is inefficient, and every section telescopic arm can only stretch to the ratio of setting, high production cost, though therefore this kind of flexible technology answer extensively
It is difficult to promote for hoister in large tonnage, but on middle or small tonnage crane.
Five joint arm autocranes frequently be that two oil cylinders+two cover telescopic arm wirerope and realize that telescopic arm is flexible,
In order to reach more remote operation, such stretch mode is applied on six joint arm cranes, i.e. I # oil cylinder uses Multi-stage cylinder
(twin-stage cylinder) controls two, three joint arms respectively and stretches, and II # oil cylinder+two covers telescopic arm wirerope four, five, six joint arms of control and stretches, and supplies
Oily problem is solved by oil pipe follower.For fuel feeding problem, original way is between one, two joint arms and two, three joint arms
Between be respectively arranged an excessively oily hose, pass through the excessively oily hose fuel feeding of pulley driving.This method can not be effective due to tracking pipe
It is fixed, it cannot be run by projected route, and telescopic arm inner space is narrow, part is more, and interference damage hidden danger is big, and replacement is difficult,
The poor reliability in practice.In addition, oil cylinder can be caused to bounce back suddenly since oil cylinder core tube volume changes when semi-girder, i.e., in reality
In the work of border, telescopic arm can bounce back a distance suddenly in semi-girder, easily cause security risk.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of double tubes to track conveying mechanism, can be 1 grade to I # oil cylinder
Cylinder, I # oil cylinder, 2 grades of cylinders and II # oil cylinder difference fuel feeding or any combination fuel feeding guarantee that any brachium position can effectively fuel feeding be made
Industry, and can effectively guide tracking oil pipe operating path.
The technical scheme adopted by the invention is that: a kind of double tube tracking conveying mechanism, including it is separately positioned on crane
It is the first oil pipe, the second oil pipe of oil cylinder fuel feeding between one joint arm and two joint arms, between two joint arms and three joint arms；Drive the first oil
Pipe, the first oil pipe pulley of the second oil pipe fuel feeding, the second oil pipe pulley；It further include being arranged between a joint arm and two joint arms and two
Slide block mechanism between joint arm and three joint arms, the slide block mechanism include the upper surface middle part sliding slot positioned at two joint arms or three joint arms
Interior sliding block, the first oil pipe pulley, the second oil pipe pulley are fixed on sliding block, and the first oil pipe pulley, the second oil pipe pulley are opposite
Sliding block rotation；It further include the first steel wire rope component for being fixed on sliding block both ends, the second steel wire rope component, the first wirerope group
Part includes the first wire rope pulley, the first wirerope, and second steel wire rope component includes the second wire rope pulley, the second steel wire
Rope, the first wire rope pulley, the second wire rope pulley are separately fixed at the both ends of sliding block, the first wire rope pulley, the second steel wire
The rotation of rope pulley opposing slider, the both ends of the first wirerope around the first wire rope pulley respectively with a joint arm oral area, two joint arms
Oral area is connected, and the both ends of the second wirerope are connected with a joint arm tail portion, two joint arm tail portions respectively around the second wire rope pulley.
The beneficial effects of the present invention are:
(1) tracking oil tube conveying mechanism can to I # oil cylinder, 1 grade of cylinder, I # oil cylinder, 2 grades of cylinders and II # oil cylinder distinguish fuel feeding or
Any combination fuel feeding, enables every section telescopic arm independent telescope of crane, so that telescopic arm be made to carry out operation in any brachium.
(2) since each oil pipe is individually for telescopic arm fuel feeding, solve telescopic arm can bounce back suddenly in semi-girder one section away from
From the problem of.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of double tube tracking conveying mechanism of the present invention.
Fig. 2 is the oil pipe connection schematic diagram of telescopic arm tail portion of the present invention.
In the figure, it is marked as 1- connecting plate, the first wirerope of 2-, 3- sliding block cover, 4- the first oil pipe pulley, the second oil pipe of 5- are sliding
Wheel, the first wire rope pulley of 6-, 7- sliding block, 8- pulley spindle, the first oil pipe of 9-, the second oil pipe of 10-, 11- pipe clamp, the second steel of 12-
Cord pulley, 13- adjusting nut, 14- locking nut, the first hose of 15-, the second hose of 16-, mono- joint arm of 17-, bis- joint arm of 18-,
19- three joint arms, 20- oil pipe pulley shield, 21- wire rope pulley cover.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Telescopic arm wirerope is covered using two oil cylinders+two the present invention is based on existing six joint arms telescopic arm structure to stretch to realize
On the basis of contracting arm is flexible, the improvement that structure for conveying is made is tracked to the fuel feeding of oil pipe.
As depicted in figs. 1 and 2, a kind of double tube of the invention tracks conveying mechanism, including is separately positioned on crane one
Between joint arm 17 and two joint arms 18, between two joint arms 18 and three joint arms 19 be oil cylinder fuel feeding the first oil pipe 9, the second oil pipe 10,
Drive the first oil pipe 9, the first oil pipe pulley 4 of 10 fuel feeding of the second oil pipe, the second oil pipe pulley 5.First oil pipe 9 of adjacent joint arm
And second be connected between oil pipe 10 respectively by the first hose 15, the second hose 16, realizes the oil circuit company of two sets 7 mechanisms of sliding block
It is logical.Specifically, the diameter of the first oil pipe pulley 4 is greater than the diameter of the second oil pipe pulley 5, after guaranteeing installation, the second oil pipe is bypassed
The oil pipe of pulley 5 and arranged side by side around the oil pipe of the first oil pipe pulley 4, and be located at around the oil pipe of the second oil pipe pulley 5 around the
The inside of the oil pipe of one oil pipe pulley 4.
In order to realize fixation and guidance to the first oil pipe 9, the second oil pipe 10, between a joint arm 17 and two joint arms 18 and
7 mechanism of sliding block is set between two joint arms 18 and three joint arms 19,7 mechanism of sliding block includes sliding block 7, with a joint arm 17 and two joint arms 18 it
Between sliding block 7 for, when initial installation, sliding block 7 is located in the upper surface middle part sliding slot of two joint arms 18, and lubricating oil is marked in sliding slot
Run sliding block 7 smooth, the first oil pipe pulley 4, the second oil pipe pulley 5 are fixed on sliding block 7, first the 4, second oil of oil pipe pulley
The rotation of 5 opposing slider 7 of pipe pulley.
In order to make the first oil pipe 9, the second oil pipe 10 by both fixed track fuel feeding, the first steel wire is respectively set at 7 both ends of sliding block
It restricts 2 components, the second steel wire rope component, 2 component of the first wirerope includes the first wire rope pulley 6, the first wirerope 2, the second steel
Cord component includes the second wire rope pulley 12, the second wirerope, the first wire rope pulley 6, the second wire rope pulley 12 difference
The both ends of sliding block 7 are fixed on, the first wire rope pulley 6,12 opposing slider 7 of the second wire rope pulley rotate, the first wirerope 2
Both ends are connected respectively around the first wire rope pulley 6 with 17 oral area of a joint arm, two joint arms, 18 oral area, the both ends of the second wirerope around
The second wire rope pulley 12 is crossed to be connected with 17 tail portion of a joint arm, two joint arms, 18 tail portion respectively.Unilateral oil pipe, wirerope are connected
It is connected to the tail portion of same joint arm 17, relative motion is avoided to lead to oil pipe friction damage.Sliding block between two joint arms 18, three joint arms 19
7 mechanism mounting means of sliding block between 7 mechanisms and an above-mentioned joint arm 17, two joint arms 18 is identical.
Oil pipe and sliding block 7, construction of wire rope based on aforementioned present invention are arranged, I 1 grade of # oil cylinder cylinder, I # oil cylinder, 2 grades of cylinders
Fuel feeding or any combination fuel feeding can be distinguished with II # oil cylinder, i.e. two joint arms 18, the joint arm of three joint arms 19 and 456 can be stretched respectively
Contracting, realizes any flexible of crane arm, and I # oil cylinder, 1 grade of cylinder, I # oil cylinder, 2 grades of cylinders or II # oil cylinder any one when stretching, first
Wirerope 2, the second wirerope can be moved with sliding block 7, realize the synchronous transport of the first oil pipe 9, the second oil pipe 10, be protected
Demonstrate,proving any brachium position can effectively fuel feeding operation.
Further, the first oil pipe 9, the second oil pipe 10 are set side by side, the first oil pipe 9, the second oil pipe 10 lean on close end
Position is fixed by pipe clamp 11, and the specific pipe clamp 11 is separately fixed inside a joint arm and two joint arm tops, installs on hose
11 guiding hose path of pipe clamp and the reliability for improving hose coupling.
Further, the first wirerope 2, the second wirerope by dismountable connecting plate 1 respectively with 17 mouthfuls of a joint arm
Portion is connected with two joint arms, 18 oral area, is connected by screw bolts between 17 oral area of connecting plate 1 and a joint arm, two joint arms, 18 oral area, removable
It unloads and is easily installed, avoid wirerope installation interference.
Further, the first wirerope 2, the second wirerope both ends be respectively provided with screw rod, pass through on the screw rod and connecting plate 1
Adjusting nut 13, locking nut 14 connect, convenient for the elastic adjusting of wirerope.
Further, shield is provided on sliding block 7, shield includes that sliding block cover 3, oil pipe pulley shield 20 and wirerope are sliding
Wheel cover 21 is separately mounted to the first oil pipe pulley 4, the second oil pipe pulley 5 and the first wire rope pulley 6, the second wire rope pulley
At 12, sliding block cover 3, oil pipe pulley shield 20 and wire rope pulley cover 21 are guided and are protected to oil pipe and wirerope respectively, sliding
Block cover 3, oil pipe pulley shield 20 and the first oil pipe 9, the inside bending in 10 contact site of the second oil pipe, to reduce oil pipe and shield
Friction improves oil pipe service life.Pulley shield, oil pipe pulley shield 20 and wire rope pulley cover 21 and sliding block 7 specifically pass through spiral shell
It tethers and connects, good reliability.First oil pipe pulley 4, the second oil pipe pulley 5 and the first wire rope pulley 6, the second wire rope pulley 12
It is mounted on sliding block 7 by pulley spindle 8.
Further, the first oil pipe 9, the second oil pipe 10 material be all made of abrasive rubber hose, lesser drawing can be born
Power and frictional force, reduce the abrasion of oil pipe, to extend the service life of oil pipe.
Further, be mitigate 7 mechanism of sliding block overall weight, sliding block 7, the first oil pipe pulley 4, the second oil pipe pulley 5,
First wire rope pulley 6, the second wirerope cunning are all made of nylon material.
Claims (10)
1. a kind of double tube tracks conveying mechanism, including
It is separately positioned between one joint arm of crane (17) and two joint arms (18), is oil between two joint arms (18) and three joint arms (19)
The first oil pipe (9), the second oil pipe (10) of oil supply cylinder；
Drive the first oil pipe (9), the first oil pipe pulley (4) of the second oil pipe (10) fuel feeding, the second oil pipe pulley (5)；
It is characterized by also including be arranged between a joint arm (17) and two joint arms (18) and two joint arms (18) and three joint arms (19)
Between sliding block (7) mechanism, sliding block (7) mechanism include positioned at two joint arms (18) or three joint arms (19) upper surface middle part it is sliding
Sliding block (7) in slot, the first oil pipe pulley (4), the second oil pipe pulley (5) are fixed on sliding block (7), the first oil pipe pulley (4),
The rotation of second oil pipe pulley (5) opposing slider (7)；It further include the first wirerope (2) component for being fixed on sliding block (7) both ends,
Two steel wire rope components, the first wirerope (2) component include the first wire rope pulley (6), the first wirerope (2), and described the
Two steel wire rope components include the second wire rope pulley (12), the second wirerope, and the first wire rope pulley (6), the second wirerope are sliding
Wheel (12) is separately fixed at the both ends of sliding block (7), the first wire rope pulley (6), the second wire rope pulley (12) opposing slider (7)
Rotation, the both ends of the first wirerope (2) around the first wire rope pulley (6) respectively with a joint arm (17) oral area, two joint arms (18)
Oral area is connected, the both ends of the second wirerope around the second wire rope pulley (12) respectively with a joint arm (17) tail portion, two joint arms
(18) tail portion is connected.
2. double tube as described in claim 1 tracks conveying mechanism, it is characterised in that: first oil pipe (9), the second oil pipe
(10) it is set side by side, the first oil pipe (9), the close end position of the second oil pipe (10) are fixed by pipe clamp (11), the pipe clamp
(11) it is separately fixed at a joint arm (17), in two joint arms (18).
3. double tube as described in claim 1 tracks conveying mechanism, it is characterised in that: the first oil pipe (9) of adjacent joint arm and
It is connected to respectively by the first hose (15), the second hose (16) between second oil pipe (10).
4. double tube as described in claim 1 tracks conveying mechanism, it is characterised in that: first wirerope (2), the second steel
Cord is connect with a joint arm (17) oral area and two joint arms (18) oral area by dismountable connecting plate (1) respectively, the connection
It is connected by screw bolts between plate (1) and a joint arm (17) oral area, two joint arms (18) oral area.
5. double tube as claimed in claim 4 tracks conveying mechanism, it is characterised in that: the first wirerope (2), the second wirerope
Both ends be respectively provided with screw rod, the screw rod with pass through adjusting nut (13), locking nut (14) on connecting plate (1) and connect.
6. as double tube described in any one of claim 1 to 5 tracks conveying mechanism, it is characterised in that: set on the sliding block (7)
It is equipped with shield, the shield includes sliding block cover (3), oil pipe pulley shield (20) and wire rope pulley cover (21), is installed respectively
At the first oil pipe pulley (4), the second oil pipe pulley (5) and the first wire rope pulley (6), the second wire rope pulley (12).
7. double tube according to claim 6 tracks conveying mechanism, it is characterised in that: the sliding block cover (3), oil pipe pulley
Cover (20) and the first oil pipe (9), the inside bending in the second oil pipe (10) contact site.
8. double tube as claimed in claim 7 tracks conveying mechanism, it is characterised in that: the first oil pipe pulley (4), the second oil pipe
Pulley (5) and the first wire rope pulley (6), the second wire rope pulley (12) are mounted on sliding block (7) by pulley spindle (8).
9. double tube as claimed in claims 6 or 7 tracks conveying mechanism, it is characterised in that: the first oil pipe (9), the second oil pipe
(10) abrasive rubber hose is all made of to be made.
10. double tube as claimed in claims 6 or 7 tracks conveying mechanism, it is characterised in that: the sliding block (7), the first oil pipe
Pulley (4), the second oil pipe pulley (5), the first wire rope pulley (6), the second wirerope cunning are all made of nylon material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910796055.0A CN110510533B (en) | 2019-08-27 | 2019-08-27 | Double-oil-pipe tracking conveying mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910796055.0A CN110510533B (en) | 2019-08-27 | 2019-08-27 | Double-oil-pipe tracking conveying mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110510533A true CN110510533A (en) | 2019-11-29 |
| CN110510533B CN110510533B (en) | 2020-09-01 |
Family
ID=68627990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910796055.0A Expired - Fee Related CN110510533B (en) | 2019-08-27 | 2019-08-27 | Double-oil-pipe tracking conveying mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110510533B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704043A (en) * | 2020-06-17 | 2020-09-25 | 柳州柳工挖掘机有限公司 | Telescopic boom structure, operation boom and engineering machinery |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA923851A (en) * | 1970-07-13 | 1973-04-03 | J. Reimbold James | Continuous hydraulic hose structure for telescopic boom assembly |
| JP2006256828A (en) * | 2005-03-18 | 2006-09-28 | Kobelco Cranes Co Ltd | Telescopic boom |
| JP2009067590A (en) * | 2007-08-17 | 2009-04-02 | Kobelco Cranes Co Ltd | Telescopic boom |
| KR100990328B1 (en) * | 2010-04-13 | 2010-10-29 | 이점수 | Telescopic boom crane with oil-free slide plates type |
| CN201737659U (en) * | 2010-08-31 | 2011-02-09 | 湖南山河智能机械股份有限公司 | Oil tube conveying mechanism of telescopic handler manipulator |
| CN104196814A (en) * | 2014-08-13 | 2014-12-10 | 合肥长源液压股份有限公司 | Hydraulic oil cylinder of built-in stacked type oil pipe structure |
| JP2017081715A (en) * | 2015-10-29 | 2017-05-18 | 株式会社加藤製作所 | Jib hoisting device for work equipment |
| CN207347016U (en) * | 2017-09-12 | 2018-05-11 | 四川长江工程起重机有限责任公司 | A kind of autocrane oil pipe tracks conveying mechanism |
| CN207986548U (en) * | 2018-01-16 | 2018-10-19 | 杭州爱知工程车辆有限公司 | A kind of mounting structure of high-altitude operation vehicle telescopic arm inner oil tube |
-
2019
- 2019-08-27 CN CN201910796055.0A patent/CN110510533B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA923851A (en) * | 1970-07-13 | 1973-04-03 | J. Reimbold James | Continuous hydraulic hose structure for telescopic boom assembly |
| JP2006256828A (en) * | 2005-03-18 | 2006-09-28 | Kobelco Cranes Co Ltd | Telescopic boom |
| JP2009067590A (en) * | 2007-08-17 | 2009-04-02 | Kobelco Cranes Co Ltd | Telescopic boom |
| KR100990328B1 (en) * | 2010-04-13 | 2010-10-29 | 이점수 | Telescopic boom crane with oil-free slide plates type |
| CN201737659U (en) * | 2010-08-31 | 2011-02-09 | 湖南山河智能机械股份有限公司 | Oil tube conveying mechanism of telescopic handler manipulator |
| CN104196814A (en) * | 2014-08-13 | 2014-12-10 | 合肥长源液压股份有限公司 | Hydraulic oil cylinder of built-in stacked type oil pipe structure |
| JP2017081715A (en) * | 2015-10-29 | 2017-05-18 | 株式会社加藤製作所 | Jib hoisting device for work equipment |
| CN207347016U (en) * | 2017-09-12 | 2018-05-11 | 四川长江工程起重机有限责任公司 | A kind of autocrane oil pipe tracks conveying mechanism |
| CN207986548U (en) * | 2018-01-16 | 2018-10-19 | 杭州爱知工程车辆有限公司 | A kind of mounting structure of high-altitude operation vehicle telescopic arm inner oil tube |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704043A (en) * | 2020-06-17 | 2020-09-25 | 柳州柳工挖掘机有限公司 | Telescopic boom structure, operation boom and engineering machinery |
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| Publication number | Publication date |
|---|---|
| CN110510533B (en) | 2020-09-01 |
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