CN112374366B - Hoisting system for assembling concrete pump truck supporting leg system and hoisting method thereof - Google Patents
Hoisting system for assembling concrete pump truck supporting leg system and hoisting method thereof Download PDFInfo
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- CN112374366B CN112374366B CN202011263561.2A CN202011263561A CN112374366B CN 112374366 B CN112374366 B CN 112374366B CN 202011263561 A CN202011263561 A CN 202011263561A CN 112374366 B CN112374366 B CN 112374366B
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- 238000000034 method Methods 0.000 title claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
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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
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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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
- B66C13/00—Other constructional features or details
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- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention relates to a hoisting system for assembling a concrete pump truck landing leg system, which comprises a first landing leg assembly and a second landing leg assembly, wherein the first landing leg assembly and the second landing leg assembly are mutually nested; a second securing assembly connected to the second leg assembly; the steel wire rope is used for connecting the first fixing component and the second fixing component; the movable pulley of winding on locating wire rope, the movable pulley is used for connecting one and lifts by crane the unit, it is used for exerting force tensioning wire rope to the movable pulley to lift by crane the unit, make wire rope and the pulling force F1 that the link of the fixed subassembly of second produced at the horizontal direction remove second landing leg subassembly to first landing leg subassembly promptly and the second landing leg subassembly draws in to first landing leg subassembly is inside, thereby the whole length of control landing leg system is the length of first landing leg subassembly, not only can greatly reduce the regional area of assembly of landing leg system, can also effectively practice thrift the area of the assembly station in mill's workshop.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a hoisting system for assembling a concrete pump truck supporting leg system and a hoisting method thereof.
Background
The front supporting legs are key components of a concrete pump truck, the front supporting legs of most of the existing middle-long cantilever crane pump trucks are mainly formed by two-stage supporting legs or three-stage telescopic assembly, the length of a single-stage supporting leg is about 3m, the front supporting legs of each stage are required to be assembled separately, and then the front supporting legs are integrally hoisted and installed in a supporting leg box on a pump truck underframe; because during the assembly, the front supporting leg is placed in the assembly area in a stretching state, not only needs to occupy larger assembly area, but also needs at least two traveling cranes to complete the hoisting of the whole supporting leg system, so that the use area of a production workshop is increased, the production cost is improved, two traveling cranes are needed to hoist, the time and the labor are wasted, and the assembly efficiency of the whole concrete pump truck is reduced.
Therefore, the inventor provides a hoisting system for assembling a concrete pump truck support leg system and a hoisting method thereof.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides a hoisting system and a hoisting method thereof for assembling a concrete pump truck landing leg system.
(2) Technical scheme
In a first aspect, an embodiment of the invention provides a hoisting system for assembling a concrete pump truck leg system, wherein the leg system comprises a first leg assembly and a second leg assembly, the first leg assembly and the second leg assembly are nested with each other, the hoisting system comprises a first fixing assembly connected with the first leg assembly, a second fixing assembly connected with the second leg assembly, a steel wire rope connecting the first fixing assembly and the second fixing assembly, and a movable pulley wound on the steel wire rope and used for connecting a hoisting unit, and the hoisting unit is used for applying force to the movable pulley to tension the steel wire rope, so that the second leg assembly is moved into the first leg assembly by a tensile force F1 generated in the horizontal direction at the connecting end of the steel wire rope and the second fixing assembly.
Further, a lifting force F2 generated in a vertical direction by a connection end of the steel cable and the second fixing assembly moves the second leg assembly in a direction approaching the lifting unit.
Furthermore, a hanging ring is arranged on the movable pulley, and the hanging ring and the lifting unit are fastened with each other in a lifting state to tension the steel wire rope and are separated from each other in a to-be-lifted state to loosen the steel wire rope.
Further, the hoisting unit comprises a lifting hook and a power source for driving the lifting hook to do lifting motion.
Further, first fixed subassembly including install in first clamp on the first landing leg subassembly, first clamp is connected wire rope's one end, the fixed subassembly of second including install in the second clamp of second landing leg subassembly, the second clamp is connected wire rope's the other end.
Further, first landing leg subassembly include with first leg of first clamp connection, second landing leg subassembly includes the second landing leg and connects the landing leg hydro-cylinder of second landing leg, the second clamp install in on the landing leg hydro-cylinder.
Furthermore, cushion blocks used for supporting the first supporting leg and the second supporting leg are arranged below the first supporting leg and the second supporting leg respectively.
The embodiment of the invention also provides a hoisting method for assembling the concrete pump truck landing leg system, the concrete pump truck landing leg system is assembled by adopting the hoisting system, and the method comprises the following steps: fixing the first fixing component on the first leg component, fixing the second fixing component on the second leg component, and connecting two ends of the steel wire rope to the first fixing component and the second fixing component respectively; step two: and winding the movable pulley on the steel wire rope, then lifting the movable pulley at a constant speed by the lifting unit, and moving the second support leg assembly towards the inside of the first support leg assembly under the action of a pulling force F1 of the steel wire rope in the horizontal direction until the second support leg assembly completely extends into the first support leg assembly.
Further, in the second step, the second leg assembly moves towards the direction close to the hoisting unit under the action of the lifting force F2 of the steel wire rope in the vertical direction until the second leg assembly is in a suspended state, and the hoisting unit stops acting.
Furthermore, the hoisting unit is put down until the steel wire rope is in a loose state, the first fixing assembly is adjusted to be at the installation position of the first supporting leg assembly, then the hoisting unit is started again to hoist the movable pulley at a constant speed, and the second supporting leg assembly moves towards the inside of the first supporting leg assembly under the action of the pulling force F1 of the steel wire rope in the horizontal direction until the second supporting leg assembly completely extends into the first supporting leg assembly.
(3) Advantageous effects
In conclusion, the movable pulley is lifted by the lifting hook to tension the steel wire rope, so that the second supporting leg is moved towards the inside of the first supporting leg by the pulling force generated by the steel wire rope and one end of the second supporting leg in the horizontal direction, namely the second supporting leg is folded towards the inside of the first supporting leg, the overall length of the supporting leg system is controlled to be equal to the length of the first supporting leg, the area of an assembly area of the supporting leg system is greatly reduced, and the area of an assembly station of a factory workshop can be effectively saved.
According to the invention, the movable pulley is lifted by the lifting hook to tension the steel wire rope, so that the second supporting leg is moved towards the direction close to the lifting hook by the pulling force generated by the steel wire rope and one end of the second supporting leg in the vertical direction, the friction force between the second supporting leg and the first supporting leg when the second supporting leg is folded towards the inside of the first supporting leg is reduced, and the folding speed of the second supporting leg towards the inside of the first supporting leg is improved.
The hoisting system provided by the invention is easy to operate, can be suitable for assembling and folding among various support legs with different lengths, and has strong applicability.
The multi-stage support leg system is hoisted after the multi-stage support legs are folded, and a plurality of traveling cranes or other hoisting equipment are not used for hoisting in a matched mode, so that the hoisting difficulty of the whole support leg system is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is another schematic structural diagram of the present invention.
Figure 3 is a schematic view of the hoist of the leg system of the present invention in an open position.
Figure 4 is a schematic illustration of the lifting of the leg system of the present invention in a collapsed condition.
In the figure:
1-a first leg assembly; 2-a second leg assembly; 3-a steel wire rope; 4-a movable pulley; 5-hoisting rings; 6, hoisting a unit; 7-a first clamp; 8-a second clamp; 9-a hook; 10-cushion block; 11-a first leg; 21-a second leg; 22-a support oil cylinder;
Detailed Description
Embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of a hoisting system for assembling a concrete pump truck leg system according to an embodiment of the present invention, and as shown in fig. 1, the leg system includes a first leg assembly 1 and a second leg assembly 2, the first leg assembly 1 and the second leg assembly 2 are nested with each other (as shown in fig. 1, the second leg assembly is embedded in the first leg assembly, that is, the leg to be folded is embedded in another leg for accommodating the leg to be folded), and the hoisting system includes a first fixing assembly connected to the first leg assembly 1; the second fixing component is connected with the second supporting leg component 2, the steel wire rope 3 is connected with the first fixing component and the second fixing component, the movable pulley 4 is wound on the steel wire rope 3, the movable pulley 4 is used for being connected with a hoisting unit 6, the hoisting unit 6 is used for applying force to the movable pulley 4 to tension the steel wire rope 3, and therefore the second supporting leg component 2 is moved into the first supporting leg component 1 through tensile force F1 generated in the horizontal direction by the connecting end of the steel wire rope 3 and the second fixing component.
According to the invention, the movable pulley is lifted by the lifting unit (a lifting hook, which is described in detail later) to tension the steel wire rope, so that the second supporting leg moves towards the inside of the first supporting leg by pulling the steel wire rope and one end of the second supporting leg in the horizontal direction, namely the second supporting leg is folded towards the inside of the first supporting leg, the whole length of the supporting leg system is controlled to be equal to the length of the first supporting leg, the area of an assembly area of the supporting leg system is greatly reduced, and the area of an assembly station of a factory workshop can be effectively saved.
As a preferred embodiment, as shown in fig. 2, a lifting force F2 generated in a vertical direction by the connection end of the wire rope 3 and the second fixing assembly moves the second leg assembly 2 in a direction close to the hoisting unit 6, and the hoisting unit (a hook, described in detail later) hoists the movable pulley to tension the wire rope, so that a pulling force generated in the vertical direction by the wire rope and one end of the second leg moves the second leg in the direction close to the hook, thereby reducing a friction force between the second leg and the first leg when the second leg is folded in the first leg, increasing a speed at which the second leg is folded in the first leg, and further improving the assembly efficiency of the leg system.
As another preferred embodiment, as shown in fig. 2, a hanging ring 5 is provided on the movable pulley 3, the hanging ring 5 and the lifting unit 6 are fastened to each other in a lifting state for tensioning the steel wire rope 3 and are separated from each other in a to-be-lifted state for loosening the steel wire rope 3, and by tensioning the steel wire rope, it can be ensured that the steel wire rope continuously produces a pulling force on a connection end of the steel wire rope and the second leg assembly (including the second leg, which will be described in detail later), so that the second leg assembly always maintains a pre-tightening force for moving towards the inside of the first leg assembly, and the assembly process becomes smoother.
As other alternative embodiments.
Preferably, as shown in fig. 1 and 2, the lifting unit 6 includes a lifting hook 9 and a power source for driving the lifting hook 9 to move up and down, wherein the power source can be derived from a cylinder or a hydraulic cylinder on a crane, a gantry crane or other lifting equipment.
Preferably, as shown in fig. 1 and 2, the first fixing component includes a first clip 7 mounted on the first leg assembly 1, the first clip 7 is connected to one end of the steel wire rope 3, the second fixing component includes a second clip 8 mounted on the second leg assembly 1, the second clip 8 is connected to the other end of the steel wire rope 3, by connecting two ends of the steel wire rope to the first clip and the second clip respectively, and the position of the second clip in the vertical direction is higher than that of the first clip, so that the horizontal component force and the vertical separation magnitude of the force applied to the two ends of the steel wire rope are different, the horizontal component force of the second clip in the higher position is larger than that of the first clip in the lower position, and thus, the second leg assembly can be folded into the first leg assembly. It should be noted that, the first clamp and the second clamp have the structure of the prior art, so the present invention is not described in detail again, and the locking force between the clamp and the first leg assembly and the locking force between the clamp and the second leg assembly can be adjusted by loosening the pretightening force of the pretightening bolt, so that the locking position between the clamp and the first leg assembly and the locking position between the clamp and the second leg assembly can be adjusted at will in a loosened state.
Preferably, as shown in fig. 1 and fig. 2, the first leg assembly 1 includes a first leg 11 connected to the first clamp 7, the second leg assembly 2 includes a second leg 21 and a leg cylinder 22 connected to the second leg 21, the second clamp 8 is mounted on the leg cylinder 22, and by mounting the second clamp on the leg cylinder, the mounting position of the second clamp in the vertical direction can be increased due to the extension of the leg cylinder, and further, a better position can be selected, so that the horizontal component force of the steel cable on the connection end of the steel cable and the leg cylinder meets the requirements of the present invention.
Preferably, as shown in fig. 1 and fig. 2, cushion blocks 10 for supporting the first leg 11 and the second leg 21 are respectively arranged below the first leg 11 and the second leg 21, and damage to the first leg and the second leg during hoisting is avoided through the cushion blocks.
The embodiment of the invention also provides a hoisting method for assembling the concrete pump truck supporting leg system, the concrete steps of the hoisting method for assembling the concrete pump truck supporting leg system comprise the following steps: fixing a first fixing component, namely a first clamp 7, on a first supporting leg 11 of a first supporting leg component 1, fixing a second fixing component, namely a second clamp 8, on a supporting leg oil cylinder 22 of a second supporting leg component 2, respectively connecting two ends of a steel wire rope 3 to the first clamp 7 of the first fixing component and the second clamp 8 of the second fixing component, winding a movable pulley 4 on the steel wire rope 3, wherein the movable pulley 4 is positioned between the first clamp 7 and the second clamp 8, then buckling a lifting hook 9 of a lifting unit 6 and a lifting ring 5 on the movable pulley 4, and then lifting the movable pulley 4 at a constant speed, so that the supporting leg oil cylinder 22 of the second supporting leg component 2 moves towards the inside of the first supporting leg 11 of the first supporting leg component 1 under the action force of the steel wire rope 3 along the horizontal component force, namely the pulling force F1, until all second supporting legs 21 of the second supporting leg component 2 extend into or are folded in the first supporting leg 11 of the first supporting leg component 1.
As another preferred embodiment, in the second step, when the leg cylinder 22 of the second leg assembly 2 moves towards the hoisting unit 6 under the action of the component force of the steel wire rope 3 in the vertical direction, i.e. the lifting force F2, until the first leg 11 is in a suspended state, the hoisting unit 6 is stopped, then the hoisting unit 6 is lowered until the hook 9 is separated from the hoisting ring 5, so that the steel wire rope 3 is in a relaxed state, the mounting position of the first clamp 7 of the first fixing assembly on the first leg 11 of the first leg assembly 1 is adjusted (the position can be marked on the first leg in advance or is confirmed according to the hoisting experience of an operator), then the hoisting unit 6 is started again, so that the hook 9 and the hoisting ring 5 are buckled again to hoist the movable pulley 4 at a uniform speed and tension the steel wire rope 3 again, so that the leg cylinder 22 of the second leg assembly 2 moves towards the inside of the first leg assembly 11 of the first leg assembly 1 under the action of the component force of the steel wire rope 3 in the horizontal direction, i.e. the pulling force F1, so that the second leg cylinder 22 of the second leg assembly 2 is folded inside the first leg assembly 11 of the first leg assembly 1.
By the hoisting system, all the multi-stage front support legs can be folded, as shown in fig. 3 and 4, taking the two-stage support legs as an example, the width of the area occupied between the two second support legs 21 is about H1=10.5m when the multi-stage front support legs are hoisted in the extending state, and the width of the area occupied between the two first support legs 11 is about H2=7.5m when the multi-stage front support legs are hoisted in the folded state, namely, the width of the assembly station area in the folded state is reduced by about 3.0m compared with the width of the assembly station area in the unfolded state; meanwhile, the total length of the first supporting leg 11 and the second supporting leg 21 is about 6.0m, two pieces of lifting equipment are usually needed to be matched during lifting, the lifting difficulty is high, the number of required lifting equipment is large, and lifting can be completed only by one crane when the total length is about 3.0m (the length of the first supporting leg 11 is the same as that of the second supporting leg 21) in a furled state.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts between the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A hoist system for assembling concrete pump truck landing leg system, the landing leg system includes first landing leg subassembly (1) and second landing leg subassembly (2), first landing leg subassembly (1) with second landing leg subassembly (2) are nested each other, its characterized in that: the hoisting system comprises a hoisting device and a hoisting device,
a first fixing component connected with the first leg component (1);
a second fixing assembly connected to the second leg assembly (2);
a wire rope (3) connecting the first fixing component and the second fixing component;
a movable pulley (4) wound on the steel wire rope (3);
the movable pulley (4) is used for being connected with a hoisting unit (6), and the hoisting unit (6) is used for applying force to the movable pulley (4) to tension the steel wire rope (3), so that the second leg assembly (2) is moved into the first leg assembly (1) by a tensile force F1 generated in the horizontal direction by the connecting end of the steel wire rope (3) and the second fixing assembly.
2. The hoisting system for assembling the concrete pump truck leg system as recited in claim 1, characterized in that the second leg assembly (2) is moved closer to the hoisting unit (6) by a lifting force F2 generated in a vertical direction by the connecting end of the wire rope (3) and the second fixing assembly.
3. The hoisting system for assembling a concrete pump truck leg system as claimed in claim 1, wherein a hoisting ring (5) is provided on the movable pulley (4), the hoisting ring (5) and the hoisting unit (6) being fastened to each other in the lifted state for tensioning the steel wire rope (3) and being detached from each other in the to-be-lifted state for loosening the steel wire rope (3).
4. The hoisting system for assembling a concrete pump truck leg system as claimed in claim 1, wherein the hoisting unit (6) comprises a hoisting hook (9) and a power source for driving the hoisting hook (9) in a lifting motion.
5. The hoisting system for assembling a concrete pump truck leg system as claimed in claim 1, wherein the first fixing assembly comprises a first clip (7) mounted on the first leg assembly (1), the first clip (7) connecting one end of the steel wire rope (3), the second fixing assembly comprises a second clip (8) mounted on the second leg assembly (2), the second clip (8) connecting the other end of the steel wire rope (3).
6. Hoisting system for assembling a concrete pump truck leg system according to claim 5, characterized in that the first leg assembly (1) comprises a first leg (11) connected with the first clip (7), the second leg assembly (2) comprises a second leg (21) and a leg cylinder (22) connected with the second leg (21), and the second clip (8) is mounted on the leg cylinder (22).
7. The hoisting system for assembling a concrete pump truck leg system as claimed in claim 6, characterized in that cushion blocks (10) for supporting the first leg (11) and the second leg (21) are respectively arranged below the first leg (11) and the second leg (21).
8. A hoisting method for assembling a concrete pump truck leg system, characterized in that the hoisting system of any one of claims 1-7 is used for assembling the concrete pump truck leg system, comprising:
the method comprises the following steps: fixing the first fixing component on the first leg component (1), fixing the second fixing component on the second leg component (2), and connecting two ends of the steel wire rope (3) to the first fixing component and the second fixing component respectively;
step two: and winding the movable pulley (4) on the steel wire rope (3), starting the hoisting unit (6) to hoist the movable pulley (4) at a constant speed, and moving the second support leg assembly (2) towards the inside of the first support leg assembly (1) under the action of a tension F1 of the steel wire rope (3) along the horizontal direction until the second support leg assembly (2) completely extends into the first support leg assembly (1).
9. The hoisting method for assembling the concrete pump truck leg system as claimed in claim 8, wherein in the second step, the second leg assembly (2) stops the hoisting unit (6) when moving in the direction approaching the hoisting unit (6) under the action of the lifting force F2 of the steel cable (3) in the vertical direction until in a suspended state.
10. The hoisting method for assembling the concrete pump truck leg system as recited in claim 9, characterized in that the hoisting unit (6) is put down until the steel wire rope (3) is in a loose state, the installation position of the first fixing component on the first leg component (1) is adjusted, then the hoisting unit (6) is started again to hoist the movable pulley (4) at a constant speed, and the second leg component (2) moves towards the inside of the first leg component (1) under the action of the tension force F1 of the steel wire rope (3) along the horizontal direction until the second leg component (2) is completely extended into the first leg component (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011263561.2A CN112374366B (en) | 2020-11-12 | 2020-11-12 | Hoisting system for assembling concrete pump truck supporting leg system and hoisting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011263561.2A CN112374366B (en) | 2020-11-12 | 2020-11-12 | Hoisting system for assembling concrete pump truck supporting leg system and hoisting method thereof |
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| Publication Number | Publication Date |
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| CN112374366A CN112374366A (en) | 2021-02-19 |
| CN112374366B true CN112374366B (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011263561.2A Active CN112374366B (en) | 2020-11-12 | 2020-11-12 | Hoisting system for assembling concrete pump truck supporting leg system and hoisting method thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114043186B (en) * | 2021-09-30 | 2023-01-06 | 中联重科股份有限公司 | Poking and installing equipment and poking and installing method for movable supporting leg |
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| JPH07291587A (en) * | 1994-04-25 | 1995-11-07 | Hitachi Constr Mach Co Ltd | Tower crane |
| CN102303813A (en) * | 2011-09-08 | 2012-01-04 | 徐州重型机械有限公司 | Crane support leg, support leg hydraulic system and crane |
| CN202657825U (en) * | 2012-05-18 | 2013-01-09 | 湖北省输变电工程公司 | Device for lifting guyed tower in integrally assembled mode |
| CN203998733U (en) * | 2014-06-25 | 2014-12-10 | 徐州重型机械有限公司 | A kind of boom device and super starter pulley bracket thereof |
| CN204079327U (en) * | 2014-09-18 | 2015-01-07 | 中联重科股份有限公司 | Radiation type landing leg structure and engineering machinery |
| CN204750125U (en) * | 2015-06-24 | 2015-11-11 | 三一汽车制造有限公司 | Telescopic leg subassembly and mobile concrete pump |
-
2020
- 2020-11-12 CN CN202011263561.2A patent/CN112374366B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07291587A (en) * | 1994-04-25 | 1995-11-07 | Hitachi Constr Mach Co Ltd | Tower crane |
| CN102303813A (en) * | 2011-09-08 | 2012-01-04 | 徐州重型机械有限公司 | Crane support leg, support leg hydraulic system and crane |
| CN202657825U (en) * | 2012-05-18 | 2013-01-09 | 湖北省输变电工程公司 | Device for lifting guyed tower in integrally assembled mode |
| CN203998733U (en) * | 2014-06-25 | 2014-12-10 | 徐州重型机械有限公司 | A kind of boom device and super starter pulley bracket thereof |
| CN204079327U (en) * | 2014-09-18 | 2015-01-07 | 中联重科股份有限公司 | Radiation type landing leg structure and engineering machinery |
| CN204750125U (en) * | 2015-06-24 | 2015-11-11 | 三一汽车制造有限公司 | Telescopic leg subassembly and mobile concrete pump |
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| Publication number | Publication date |
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| CN112374366A (en) | 2021-02-19 |
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Denomination of invention: A lifting system and lifting method for assembling concrete pump truck support leg system Granted publication date: 20230228 Pledgee: Agricultural Bank of China Limited Changde branch Pledgor: Hunan Xiangjian Heavy Industry Technology Co.,Ltd. Registration number: Y2024980001561 |
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