CN103663194B - Telescopic boom and engineering machinery - Google Patents
Telescopic boom and engineering machinery Download PDFInfo
- Publication number
- CN103663194B CN103663194B CN201310674885.9A CN201310674885A CN103663194B CN 103663194 B CN103663194 B CN 103663194B CN 201310674885 A CN201310674885 A CN 201310674885A CN 103663194 B CN103663194 B CN 103663194B
- Authority
- CN
- China
- Prior art keywords
- telescopic boom
- telescopic
- pipe link
- cylinder body
- mounting groove
- 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.)
- Active
Links
- 238000009434 installation Methods 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 8
- 239000003921 oil Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Actuator (AREA)
Abstract
The invention discloses a telescopic arm and engineering machinery, wherein the telescopic arm comprises a first arm section (1), a plurality of telescopic arm sections which can relatively stretch and retract and a multi-stage hydraulic cylinder, the multi-stage hydraulic cylinder comprises a piston rod (5) and a plurality of cylinder bodies, the piston rod is connected to the first arm section, the plurality of cylinder bodies are respectively connected to the plurality of telescopic arm sections in corresponding number through a plurality of connecting structures in corresponding number, a mounting groove is formed in the head of each cylinder body, each connecting structure comprises a connecting rod (8) and a connecting block (9) mounted through the mounting groove, the connecting rod is arranged in the telescopic arm sections, two ends of each connecting rod are respectively fixed on opposite side walls of the telescopic arm sections, the connecting rod extends in the telescopic direction, and the connecting rod is in sliding fit with the connecting blocks, so that the connecting rod can slide relative to the connecting. When the telescopic boom is laterally loaded, the connecting rod can slide relative to the connecting block, so that the lateral force is prevented from being directly loaded on the multi-stage hydraulic cylinder, and the multi-stage hydraulic cylinder is protected from being laterally loaded.
Description
Technical field
The present invention relates to construction machinery and equipment, particularly, relate to a kind of telescopic boom and the construction machinery and equipment comprising this telescopic boom.
Background technology
At present, the telescopic boom of hoisting crane is saved to be connected together by the slide block set of alternate arm internode with upper arm by two joints and forms, and is arranged on the fore and aft motion being realized jib by the telescopic system in jib.Existing telescopic system, mainly comprise telescopic oil cylinder (such as multistage hydraulic cylinder), telescopic oil cylinder and alternate arm internode connection mode are: in crane amplitude variation plane, and telescopic oil cylinder is undertaken hinged by bearing pin and alternate arm internode, and therefore transverse load suffered by jib cannot pass to telescopic oil cylinder; In crane rotation plane, telescopic oil cylinder and alternate arm internode are for being rigidly connected, jib transverse load very easily passes to telescopic oil cylinder, oil cylinder piston is made to be subject to lateral loading, cause that telescopic oil cylinder piston rod is pulled, oil cylinder hydraulic oil leaks, under serious conditions, even cause piston rods bend unstable failure.
Summary of the invention
The object of this invention is to provide and a kind ofly can implement to multistage hydraulic cylinder the telescopic boom that protection is carried in side.
To achieve these goals, the invention provides a kind of telescopic boom, this telescopic boom comprise the first arm joint and set gradually can the multiple telescopic booms joint of relative telescopic, described telescopic boom also comprises the multistage hydraulic cylinder of the relative telescopic for realizing described multiple telescopic boom joint, described multistage hydraulic cylinder comprises piston rod and the multiple cylinder bodies be connected successively, wherein, described piston rod is connected to described first arm joint, described multiple cylinder body is connected to the multiple described telescopic boom joint of respective numbers respectively by multiple connection structures of respective numbers, the head of each cylinder body is provided with mounting groove, each connection structure comprises pipe link and is arranged on the contiguous block on described cylinder body by described mounting groove, described pipe link be arranged on described telescopic boom joint in and the two ends of described pipe link be separately fixed at described telescopic boom joint relative sidewall on, the telescopic direction that described pipe link saves perpendicular to described telescopic boom extends, and described pipe link and described contiguous block bearing fit, described pipe link can be slided relative to the bearing of trend of described contiguous block along described pipe link.
Preferably, described contiguous block comprises the installation portion for coordinating with described mounting groove and is connected to the support portion of described installation portion, and described support portion is provided with to be passed and the through hole slided for described pipe link.
Preferably, described mounting groove extends along the radial direction of described cylinder body, and described installation portion is formed as cylindric and is rotatably mounted in described mounting groove.
Preferably, the line of centers of columned described installation portion and the vertical and intersectant centerline of described through hole.
Preferably, the cross-sectional plane of described through hole is circular, and the cross-sectional plane of described pipe link is corresponding circular.
Preferably, described piston rod is articulated with described first arm joint.
Preferably, the head of each cylinder body is provided with at least two described mounting grooves, each connection structure comprise at least two contiguous blocks being installed on corresponding described mounting groove respectively and respectively with at least two pipe links of described at least two contiguous block bearing fits.
Preferably, the head of each cylinder body is provided with laterally zygomorphic two the described mounting grooves of telescopic direction about described multistage hydraulic cylinder.
Preferably, described telescopic boom also comprises the flexible Sheng Pai mechanism for auxiliary described telescopic boom joint.
The present invention also provides a kind of construction machinery and equipment, and wherein, described construction machinery and equipment comprises telescopic boom of the present invention.
By technique scheme, when telescopic boom be subject to side carry time, pipe link can slide relative to contiguous block, avoids side force to be directly loaded on multistage hydraulic cylinder, thus to multistage hydraulic cylinder implement side carry protection.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the structural representation that telescopic boom of the present invention is described;
Fig. 2 is the partial perspective view of the inner structure of the telescopic boom of instruction diagram 1;
Fig. 3 is the vertical view cutaway drawing of Fig. 2;
Fig. 4 is the cutaway view intercepted along A-A line in Fig. 3.
Description of reference numerals
1 first arm joint 2 second arm joint 3 the 3rd arm joint 4 the 4th arm joint
5 piston rod 6 first cylinder body 6a first mounting groove 6b track adjusting wheels
7 second cylinder body 7a second mounting grooves
8 pipe link 9 contiguous block 9a installation portion 9b support portions
10 Sheng Pai mechanisms 11 stretch out pulley 12 pulley 13 of retracting and stretch out steel rope
14 retraction steel ropes
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, when not doing contrary explanation, the noun of locality such as " upper and lower, left and right " of use typically refers to reference to upper and lower, left and right shown in the drawings; " inside and outside " refers to profile inside and outside relative to each parts itself.
According to an aspect of the present invention, a kind of telescopic boom is provided, this telescopic boom comprise the first arm joint 1 and set gradually can the multiple telescopic booms joint of relative telescopic, described telescopic boom also comprises the multistage hydraulic cylinder of the relative telescopic for realizing described multiple telescopic boom joint, described multistage hydraulic cylinder comprises piston rod 5 and the multiple cylinder bodies be connected successively, wherein, described piston rod 5 is connected to described first arm joint 1, described multiple cylinder body is connected to the multiple described telescopic boom joint of respective numbers respectively by multiple connection structures of respective numbers, the head of each cylinder body is provided with mounting groove, each connection structure is comprised pipe link 8 and is arranged on the contiguous block 9 on described cylinder body by described mounting groove, described pipe link 8 be arranged on described telescopic boom joint in and the two ends of described pipe link 8 be separately fixed at described telescopic boom joint relative sidewall on, the telescopic direction that described pipe link 8 saves perpendicular to described telescopic boom extends, and described pipe link 9 and described contiguous block 9 bearing fit, described pipe link 8 can be slided relative to the bearing of trend of described contiguous block 9 along described pipe link 8.
According to a further aspect in the invention, provide a kind of construction machinery and equipment, wherein, described construction machinery and equipment comprises telescopic boom of the present invention.Preferably, described construction machinery and equipment is hoisting crane.
Use telescopic boom of the present invention, when telescopic boom be subject to side carry time, pipe link 8 can slide relative to contiguous block 9, on the cylinder body avoiding side force to be directly loaded into multistage hydraulic cylinder and piston rod, thus implements side to multistage hydraulic cylinder and carries protection.
Wherein, contiguous block 9 can adopt various suitable form, such as described contiguous block 9 can comprise the installation portion 9a for coordinating with described mounting groove and be connected to the support portion 9b of described installation portion 9a, and described support portion 9b is provided with and allows described pipe link 8 to pass and the through hole slided.Wherein, through hole and pipe link 8 should form the matching relationship that just can slide, and such as, when the cross-sectional plane of through hole and pipe link 8 is circle, the aperture of through hole can 1-2mm larger than the diameter of pipe link 8.
Preferably, described mounting groove extends along the radial direction of described cylinder body, and described installation portion 9a can be formed as cylindric and be rotatably mounted in described mounting groove.Thus, carry when side and cause pipe link 8 to slide, make the axis of telescopic boom and the axis of multistage hydraulic cylinder produce the angle of cut, the moment of torsion that generation is carried in side can be prevented directly to be carried on multistage hydraulic cylinder by the rotation of installation portion 9a, optimize anti-side further and carry effect.
In addition, preferably, the columned line of centers of described installation portion 9a and the vertical and intersectant centerline of described through hole.In other words, contiguous block 9 can be formed as with the plane mirror at the line of centers place of the line of centers of installation portion 9a and through hole as symmetrical structure, increases stationarity with simplified manufacturing technique.
In addition, described piston rod 5 is articulated with described first arm joint 1, to adapt to the scaling operation of telescopic boom joint.Wherein, piston rod 5 and the first arm save 1 hinged, and piston rod 5 can be made to rotate around the axis being parallel to pipe link 8.
In addition, preferably, the cross-sectional plane of described through hole is circular, and the cross-sectional plane of described pipe link 8 is corresponding circular, to make relative sliding more smooth and easy.
In addition, preferably, the head of each cylinder body is provided with at least two described mounting grooves, each connection structure comprise at least two contiguous blocks 9 of being installed on corresponding described mounting groove respectively and respectively with at least two pipe links 8 of described at least two contiguous blocks 9 bearing fit.By arranging at least two mounting grooves at the head of each cylinder body and installing contiguous block and the pipe link of respective numbers, corresponding arm joint and cylinder body can be connected uniformly across each connection structure.
For implementing uniform stressed, reducing deadweight and cost simultaneously, each cylinder body and corresponding arm joint can be connected by laterally zygomorphic two connection structures.Particularly, the head of each cylinder body is provided with laterally zygomorphic two described mounting grooves.Correspondingly, at the head of each cylinder body, two contiguous blocks and two pipe links are installed respectively by two mounting grooves.
In addition, described telescopic boom also comprises the flexible Sheng Pai mechanism 10 for auxiliary described telescopic boom joint.Here, according to factors such as the quantity that telescopic boom saves, pulley quantity and the arrangement of Sheng Pai mechanism 10 reasonably can be selected, in this no limit.
Telescopic boom of the present invention is described in detail below in conjunction with accompanying drawing, in the illustrated embodiment, telescopic boom comprises the first arm joint 1 and three telescopic boom joints (i.e. the second arm joint the 2, the 3rd arm joint 3 and the 4th arm joint 4), multistage hydraulic cylinder comprises piston rod 5, first cylinder body 6 and the second cylinder body 7, second cylinder body 7 can stretch out from the first cylinder body 6, piston rod 5 can stretch out from the second cylinder body, and the top of the first cylinder body 6 is provided with leading sheave 6b.
Wherein, as shown in Figure 2 and Figure 4, the first cylinder body 6 is by symmetrically arranged two contiguous blocks 9 and corresponding two pipe links 8 are connected to the 3rd arm joint 3 up and down; Second cylinder body 7 is by symmetrically arranged two contiguous blocks 9 and corresponding two pipe links 8 are connected to the second arm joint 2 up and down.Particularly, the head of the first cylinder body 6 is provided with laterally zygomorphic two the first mounting groove 6a of telescopic direction about described multistage hydraulic cylinder, the installation portion 9a of contiguous block 9 is rotatably installed in the first mounting groove 6a that (installation portion 9a is set to cylindric, first mounting groove 6a is set to corresponding cylindrical slot), support portion 9b is set to be connected to the block structure above installation portion 9a, pipe link 8 through the through hole be arranged on the 9b of support portion and two ends be connected to the 3rd arm joint 3 madial wall on.Similarly, the head of the second cylinder body 7 is provided with laterally zygomorphic two the second mounting groove 7a, the installation portion 9a of contiguous block 9 is rotatably installed in the second mounting groove 7a (the second mounting groove 7a is also set to corresponding cylindrical slot), support portion 9b is set to be connected to the block structure above installation portion 9a, pipe link 8 through the through hole be arranged on the 9b of support portion and two ends be connected to second arm joint 2 madial wall on.
When side occurring and carrying, there is side and carry in such as the second arm joint 2, then the pipe link 8 connecting the second arm joint 2 and the second cylinder body 7 can slide relative to contiguous block 9, avoids side force to be directly loaded on the second cylinder body 7, thus carry protection to multistage hydraulic cylinder enforcement side.Carrying when side causes pipe link 8 to slide, and makes the second arm joint axis of 2 and the axis of multistage hydraulic cylinder produce the angle of cut, the moment of torsion that generation is carried in side can be prevented directly to be carried on the second cylinder body 7 by the rotation of installation portion 9a, optimize anti-side further and carry effect.
In addition, in the illustrated embodiment, because telescopic boom comprises altogether four joint arms, and have employed the multistage hydraulic cylinder with two cylinder bodies, therefore, the Sheng Pai mechanism 10 such as with two pulleys and two steel ropes can be used.As shown in Figure 1, Sheng Pai mechanism 10 comprises stretches out pulley 11, retraction pulley 12, stretches out steel rope 13 and retraction steel rope 14, wherein, stretching out pulley 11 is fixed on inside the external part of the 3rd arm joint 3, retraction pulley 12 is fixed on inside the root of the 3rd arm joint 3, the root of the 4th arm joint 4 is fixed in the one end of stretching out steel rope 13, the other end is walked around and is stretched out the root that pulley 11 is fixed on the second arm joint 2, the root of the 4th arm joint 4 is fixed in one end of retraction steel rope 14, and the other end is walked around retraction pulley 12 and is fixed on the first cylinder body 6.
Understandable, when adopting more or less telescopic boom joint, can corresponding use more multistage hydraulic cylinder or common single stage hydraulic cylinder, and correspondingly set up or reduce connection structure.Meanwhile, the Sheng Pai mechanism 10 also reasonable Arrangement of pulley and the steel rope with right quantity can be adopted, to coordinate the flexible telescopic boom with respective numbers telescopic boom joint.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a telescopic boom, this telescopic boom comprises the first arm joint (1) and can the multiple telescopic booms of relative telescopic saving of setting gradually, described telescopic boom also comprises the multistage hydraulic cylinder of the relative telescopic for realizing described multiple telescopic boom joint, described multistage hydraulic cylinder comprises piston rod (5) and the multiple cylinder bodies be connected successively, it is characterized in that, described piston rod (5) is connected to described first arm joint (1), described multiple cylinder body is connected to the multiple described telescopic boom joint of respective numbers respectively by multiple connection structures of respective numbers, the head of each cylinder body is provided with mounting groove, each connection structure is comprised pipe link (8) and is arranged on the contiguous block (9) on described cylinder body by described mounting groove, described pipe link (8) be arranged on described telescopic boom joint in and the two ends of described pipe link (8) be separately fixed at described telescopic boom joint relative sidewall on, the telescopic direction that described pipe link (8) saves perpendicular to described telescopic boom extends, and described pipe link (8) and described contiguous block (9) bearing fit, described pipe link (8) can be slided relative to the bearing of trend of described contiguous block (9) along described pipe link (8).
2. telescopic boom according to claim 1, it is characterized in that, described contiguous block (9) comprises the installation portion (9a) for coordinating with described mounting groove and is connected to the support portion (9b) of described installation portion (9a), and described support portion (9b) is provided with and passes and the through hole slided for described pipe link (8).
3. telescopic boom according to claim 2, is characterized in that, described mounting groove extends along the radial direction of described cylinder body, and described installation portion (9a) is formed as cylindric and is rotatably mounted in described mounting groove.
4. telescopic boom according to claim 3, is characterized in that, the columned line of centers of described installation portion (9a) and the vertical and intersectant centerline of described through hole.
5. telescopic boom according to claim 4, is characterized in that, the cross-sectional plane of described through hole is circular, and the cross-sectional plane of described pipe link (8) is corresponding circular.
6. telescopic boom according to claim 1, is characterized in that, described piston rod (5) is articulated with described first arm joint (1).
7. according to the telescopic boom in claim 1-6 described in any one, it is characterized in that, the head of each cylinder body is provided with at least two described mounting grooves, each connection structure comprise at least two contiguous blocks (9) of being installed on corresponding described mounting groove respectively and respectively with at least two pipe links (8) of described at least two contiguous blocks (9) bearing fit.
8. telescopic boom according to claim 7, is characterized in that, the head of each cylinder body is provided with laterally zygomorphic two the described mounting grooves of telescopic direction about described multistage hydraulic cylinder.
9. telescopic boom according to claim 1, is characterized in that, described telescopic boom also comprises the flexible Sheng Pai mechanism (10) for auxiliary described telescopic boom joint.
10. a construction machinery and equipment, is characterized in that, described construction machinery and equipment comprises according to the telescopic boom in claim 1-9 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310674885.9A CN103663194B (en) | 2013-12-11 | 2013-12-11 | Telescopic boom and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310674885.9A CN103663194B (en) | 2013-12-11 | 2013-12-11 | Telescopic boom and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103663194A CN103663194A (en) | 2014-03-26 |
| CN103663194B true CN103663194B (en) | 2016-01-20 |
Family
ID=50302128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310674885.9A Active CN103663194B (en) | 2013-12-11 | 2013-12-11 | Telescopic boom and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103663194B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104003319B (en) * | 2014-05-26 | 2016-09-07 | 国家电网公司 | A kind of Manual hanger |
| CN110304560A (en) * | 2019-07-19 | 2019-10-08 | 徐州徐工随车起重机有限公司 | A side crane with a telescopic boom structure |
| CN116002544A (en) * | 2023-01-17 | 2023-04-25 | 上海城建隧道装备有限公司 | Telescopic arm structure and water isolation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009022710A1 (en) * | 2008-06-16 | 2010-01-14 | Dr. Steffen Kaspar EMC GbR (vertretungsberechtigter Gesellschafter: Dr. Steffen Kaspar, 89597 Munderkingen) | Locking device for telescoping boom of vehicle, comprises connecting unit, which is provided as locking bolt, where deflection lever is provided between connecting unit and actuating medium |
| CN101723263A (en) * | 2009-11-21 | 2010-06-09 | 湖南山河智能机械股份有限公司 | Telescopic boom device |
| CN202080842U (en) * | 2011-04-29 | 2011-12-21 | 三一汽车起重机械有限公司 | Crane and multi-arm telescoping mechanism thereof |
| CN202400760U (en) * | 2011-12-30 | 2012-08-29 | 中联重科股份有限公司 | Telescopic arm device of crane and crane |
| CN203212246U (en) * | 2013-03-21 | 2013-09-25 | 北京京城重工机械有限责任公司 | Connecting structure of telescopic oil cylinder and basic arm |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4687172B2 (en) * | 2005-03-18 | 2011-05-25 | コベルコクレーン株式会社 | Telescopic boom |
-
2013
- 2013-12-11 CN CN201310674885.9A patent/CN103663194B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009022710A1 (en) * | 2008-06-16 | 2010-01-14 | Dr. Steffen Kaspar EMC GbR (vertretungsberechtigter Gesellschafter: Dr. Steffen Kaspar, 89597 Munderkingen) | Locking device for telescoping boom of vehicle, comprises connecting unit, which is provided as locking bolt, where deflection lever is provided between connecting unit and actuating medium |
| CN101723263A (en) * | 2009-11-21 | 2010-06-09 | 湖南山河智能机械股份有限公司 | Telescopic boom device |
| CN202080842U (en) * | 2011-04-29 | 2011-12-21 | 三一汽车起重机械有限公司 | Crane and multi-arm telescoping mechanism thereof |
| CN202400760U (en) * | 2011-12-30 | 2012-08-29 | 中联重科股份有限公司 | Telescopic arm device of crane and crane |
| CN203212246U (en) * | 2013-03-21 | 2013-09-25 | 北京京城重工机械有限责任公司 | Connecting structure of telescopic oil cylinder and basic arm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103663194A (en) | 2014-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111675119B (en) | Telescopic arm of crane and crane | |
| CN202646263U (en) | Telescopic boom and engineering machinery comprising same | |
| CN202936116U (en) | Folding type truck crane | |
| CN103663194B (en) | Telescopic boom and engineering machinery | |
| CN102878165B (en) | Telescopic boom and engineering machinery | |
| WO2020026842A1 (en) | Crane | |
| CN203767893U (en) | Telescopic boom and engineering machinery | |
| CN106241628A (en) | Truss arm structure and crane | |
| CN105417411A (en) | Telescopic boom structure based on multi-stage oil cylinder and crane | |
| CN205472356U (en) | Flexible arm structure and hoist | |
| CN206970063U (en) | A kind of crane five-stage telescopic boom | |
| CN103466475A (en) | Telescope arm device and crane | |
| JP2006264797A (en) | Telescopic boom device | |
| CN202481966U (en) | Suspension arm of crane | |
| CN110054097B (en) | Synchronous telescopic mechanism of lorry-mounted crane | |
| CN105084231B (en) | Telescopic boom device and engineering machinery | |
| CN205346686U (en) | Flexible arm structure and hoist with go back to mechanism of contracting | |
| CN108840258B (en) | Combined telescopic arm system and engineering machinery | |
| CN114314385B (en) | Multi-stage cylinder telescopic arm for lifting and truck crane using the telescopic arm | |
| CN216687231U (en) | Multi-stage cylinder telescopic boom for hoisting and automobile crane using same | |
| CN204161324U (en) | A kind of construction machinery and equipment and supporting leg | |
| CN104340931A (en) | High-altitude operation and multiple-section telescopic boom thereof | |
| CN103601085A (en) | Telescopic arm device and engineering vehicle | |
| CN220787880U (en) | Telescopic arm with two sections of arms capable of freely stretching | |
| KR20040095111A (en) | An interlocked operating mechanism of a telescopic boom of an aerial lift |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |