CN110203838B - Tower crane frame climbing and descending mechanism and application method thereof - Google Patents
Tower crane frame climbing and descending mechanism and application method thereof Download PDFInfo
- Publication number
- CN110203838B CN110203838B CN201910569040.0A CN201910569040A CN110203838B CN 110203838 B CN110203838 B CN 110203838B CN 201910569040 A CN201910569040 A CN 201910569040A CN 110203838 B CN110203838 B CN 110203838B
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- driving device
- jacking
- controller controls
- hanging lugs
- lifting
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- 230000009194 climbing Effects 0.000 title claims abstract description 21
- 230000007246 mechanism Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- 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
- B66C23/18—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 specially adapted for use in particular purposes
- B66C23/26—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 specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
- B66C23/28—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 specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels
- B66C23/283—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 specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels with frameworks composed of assembled elements
- B66C23/286—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 specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels with frameworks composed of assembled elements with locking 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Ladders (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a climbing and descending mechanism of a tower crane frame and a using method thereof.
Description
Technical Field
The invention belongs to the field of tower cranes, and particularly relates to a climbing and descending mechanism for a tower crane sleeve frame and a using method thereof.
Background
The tower crane is the most commonly used lifting equipment on the construction site, a sleeve frame is arranged on the tower crane, a cavity is formed in the sleeve frame, the sleeve frame is assisted to climb by a jacking oil cylinder, and a standard section of a section of the tower crane is connected into the cavity for connection and heightening.
At present, the lifting and descending work of the tower crane frame is mainly to lift and descend the frame by a hydraulic pump station, at least 4 persons are required to pull the hanging lugs and the stop shoes to open in the lifting or descending process, and the swinging of the tower crane is larger along with the continuous increase of the standard section of the tower crane, so that the operation mode is time-consuming and labor-consuming, and the danger coefficient of high-altitude operation is high.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a climbing and descending mechanism for a crane frame and a using method thereof, and aims to open a hanging lug and a stop shoe through a driving device in the climbing or descending process of the frame, so that the climbing and descending mechanism is time-saving and labor-saving, saves cost and has high safety.
In order to solve the technical problems, the invention is solved by the following technical scheme:
The lifting mechanism comprises a lifting device, lifting support legs, a first driving device, a second driving device, a third driving device and a controller, wherein one end of the lifting device is fixedly connected to the support legs, the other end of the lifting device is hinged to the lifting support legs, one end of the first driving device is connected to the lifting device, the other end of the first driving device is connected to the support legs, and the first driving device can drive the lifting device to rotate;
the lifting support legs are hinged with hanging lugs, one end of the second driving device is connected to the hanging lugs, the other end of the second driving device is connected to the lifting support legs, and the second driving device can drive the hanging lugs to rotate;
the sleeve frame is sleeved on the standard joint, a stop shoe is hinged on the sleeve frame, one end of the third driving device is connected to the stop shoe, the other end of the third driving device is connected to the sleeve frame, and the third driving device can drive the stop shoe to rotate;
The standard joint is provided with a step for supporting the hanging lugs and the stop boots, and the step is arranged along the height direction of the standard joint;
The controller is used for controlling the jacking device, the first driving device, the second driving device and the third driving device.
Further, one side of the sleeve frame comprises a first cross rod and a second cross rod, the first cross rod is arranged above the second cross rod, one end of the jacking device is fixedly connected to the first cross rod, two stop shoes are hinged to two ends of the first cross rod respectively, two third driving devices are arranged, the other end of each third driving device is connected to the first cross rod, and the other end of each first driving device is connected to the second cross rod.
Further, the jacking leg comprises a jacking cross beam and two connecting plates connected to two ends of the jacking cross beam, and two hanging lugs are respectively hinged to the connecting plates; the other end of the jacking device is hinged to the jacking cross beam.
Further, the jacking device is a jacking servo oil cylinder, and a piston rod of the jacking servo oil cylinder is hinged with the jacking leg.
Further, a hoop is arranged on the cylinder body of the jacking servo oil cylinder, and one end of the first driving device is connected to the hoop.
Further, the first driving device, the second driving device and the third driving device are all electric push rods.
Further, the first driving device is vertically connected to the jacking device.
The use method of the climbing and descending mechanism of the tower crane frame comprises the steps that when the frame climbs, the controller controls the jacking device to jack the frame for two seconds, the controller controls the third driving device to push the stop shoe outwards, the jacking device jacks the frame to the last step at the position of the stop shoe, the controller controls the third driving device to pull the stop shoe inwards, the stop shoe is hung in the step, the controller controls the jacking device to retract for two seconds, the controller controls the second driving device to push the hanging lugs outwards, the controller controls the first driving device to pull the jacking device outwards to incline, the jacking device retracts the hanging lugs to the last step at the position of the hanging lugs, the controller controls the second driving device to pull the hanging lugs inwards, and the controller controls the first driving device to retract the hanging lugs inwards.
The utility model provides a use method of tower crane frame climbing and descending mechanism, when the frame descends, the controller control jacking device will the frame is two seconds, the controller control the third drive arrangement will the stop shoe pushes away outwards, jacking device is retracted, the frame descends one and steps down, the controller control the third drive arrangement will the stop shoe inwards draws back, the stop shoe hangs in and steps, the controller control jacking device is retracted two seconds, the controller control the second drive arrangement will the hangers outwards pushes away, and the controller control the first drive arrangement will the jacking device outwards draws to slope, the jacking foot follows the jacking device to stretch out and descend one step, the controller control the second drive arrangement will the hangers inwards draws back, the controller control the first drive arrangement will the jacking device inwards pushes back the normal position, the hangers inwards.
Compared with the prior art, the invention has at least the following beneficial effects: in the climbing or descending process of the hanger, the first driving device, the second driving device and the third driving device are controlled by the controller, so that the control of the jacking device, the stop shoes and the hanging lugs is realized, the outward inclination of the jacking device is controlled by the first driving device, the connection state between the stop shoes and the steps is controlled by the second driving device, the connection state between the hanging lugs and the steps is controlled by the third driving device, the labor intensity of workers in climbing and descending the hanger through engineering is greatly reduced, the risk of high-altitude operation is reduced, the time and the labor are saved, the cost is saved, and the safety is high.
Furthermore, the jacking device is a jacking servo oil cylinder, so that automatic control is conveniently and accurately realized.
Further, the first driving device, the second driving device and the third driving device are all electric push rods, so that an air source device and auxiliary equipment required by the pneumatic actuating mechanism can be reduced, maintenance is convenient when faults occur, and the weight of the actuating mechanism can be reduced.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of the structure of the inventive cradle during climbing;
FIG. 3 is a schematic view of the structure of the inventive cradle when it is lowered;
FIG. 4 is a schematic view showing the construction of the stop shoe of the present invention pushed apart by the third drive means;
FIG. 5 is a schematic view showing the structure of the hanging lugs pushed away by the second driving device;
FIG. 6 is a schematic view showing the pushing away of the jacking device by the first driving device;
FIG. 7 is a schematic view of a partially enlarged structure of a connection between a first driving device and a jacking device according to the present invention;
FIG. 8 is a front view of the holster;
FIG. 9 is a left side view of the holster;
FIG. 10 is a front view of the jacking leg;
FIG. 11 is a view in the direction A-A of FIG. 10;
FIG. 12 is a schematic diagram of a control system according to the present invention.
In the figure: 1-a jacking device; 2-jacking supporting feet; 21-lifting the cross beam; 22-connecting plates; 3-a first drive means; 4a second driving device; 5-a third drive means; 6, sleeving a frame; 61-a first rail; 62-a second rail; 7-hanging lugs; 8-standard section; 9-stop shoes; 10-step.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 8 and 9, the frame 6 of the tower crane includes four vertical rods arranged along the vertical direction and cross rods connecting any two adjacent vertical rods, a joint opening for the standard joint 8 to come in and go out is formed in one side of the frame 6, the cross rods on one side of the frame 6 opposite to the joint opening are defined as a first cross rod 61 and a second cross rod 62, the second cross rod 62 is a cross rod near the bottom of the frame 6, and the first cross rod 61 is arranged above the second cross rod 62 and near the second cross rod 62. As shown in fig. 10 and 11, the jacking leg 2 includes a jacking beam 21 and connection plates 22 connected to both ends of the jacking beam 21.
As a preferred embodiment of the present invention, as shown in fig. 1, a climbing and descending mechanism for a tower crane frame includes a jacking device 1, a jacking leg 2, a first driving device 3, a second driving device 4, a third driving device 5 and a controller, wherein the jacking device 1 is a jacking servo cylinder, and the first driving device 3, the second driving device 4 and the third driving device 5 are all electric push rods; of course, the jacking device 1 may be a device capable of realizing displacement, such as a jacking cylinder or a displacement cylinder, and the driving device may be another type of driving device, and is not limited to an electric push rod. The controller in this embodiment is FX3U-128MR/ES-A, and the electric putter is HB-DJ825.
The extending direction of the piston rod of the jacking servo oil cylinder faces downwards, one end of the cylinder body of the jacking servo oil cylinder is fixedly connected to the middle position of the first cross rod 61, one end of the piston rod is hinged to the middle position of the jacking cross beam 21 of the jacking leg 2, and the jacking servo oil cylinder is controlled by the controller to achieve climbing and descending of the sleeve frame 6. As shown in fig. 7, a hoop is arranged on the cylinder body of the jacking servo cylinder, one end of the first driving device 3 is connected to the hoop, preferably, the first driving device 3 and the jacking servo cylinder hang down, the other end of the first driving device is connected to the second cross rod 62 of the sleeve frame 6, and the first driving device 3 is controlled by the controller to drive the jacking servo cylinder to rotate outwards at the hinging position.
As shown in fig. 10 and 11, two connecting plates 22 of the lifting foot 2 are respectively hinged with a hanging lug 7. One end of the second driving device 4 is connected to the hanging lugs 7, the other end of the second driving device is correspondingly connected to the connecting plate 22 of the jacking leg 2, and the second driving device 4 is controlled by the controller to drive the hanging lugs 7 to rotate outwards at the hinging position.
As shown in fig. 1, the sleeve frame 6 is sleeved on the standard joint 8, two ends of a first cross rod 61 of the sleeve frame 6 are respectively hinged with a stop shoe 9, one end of a third driving device 5 is connected with the stop shoe 9, the other end of the third driving device is connected with the first cross rod 61 of the sleeve frame 6, and the third driving device 5 is controlled by a controller to drive the stop shoe 9 to rotate at the hinged position.
The standard joint 8 is provided with steps 10 for supporting the hanging lugs 7 and the stop shoes 9, and the steps 10 are uniformly distributed along the height direction of the standard joint 8. By means of the cooperation between the lugs 7 and the stop shoes 9 and the steps 10, the lifting or lowering of the jacket frame 6 is realized under the action of the lifting device 1.
The application method or the working process of the invention is as follows: referring to fig. 2, 4, 5, 6 and 12, when the rack climbs, the controller controls the jacking servo cylinder to jack the rack 6 for two seconds, the controller controls the third driving device 5 to push the stop shoe 9 outwards, the jacking device 1 jacks the rack 6 to the last step 10 where the stop shoe 9 is located, the controller controls the third driving device 5 to pull the stop shoe 9 inwards, the stop shoe 9 is hung in the step 10, the controller controls the piston rod of the jacking servo cylinder to retract for two seconds, the controller controls the second driving device 4 to push the hanging lugs 7 outwards, the controller controls the first driving device 3 to pull the jacking servo cylinder outwards to incline, the piston rod of the jacking servo cylinder retracts to the last step 10 where the hanging lugs 7 are located, the controller controls the second driving device 4 to pull the hanging lugs 7 inwards to the original position, the controller controls the first driving device 3 to pull the jacking servo cylinder inwards to the original position, and the hanging lugs 7 are hung in the step 10.
Referring to fig. 3, 4, 5, 6 and 12, when the frame is lowered, the controller controls the jacking servo cylinder to jack the frame 6 for two seconds, the controller controls the third driving device 5 to push the stop shoe 9 outwards, the cylinder body of the jacking servo cylinder is retracted, the frame 6 is lowered by one step, the controller controls the third driving device 5 to pull the stop shoe 9 inwards, the stop shoe 9 is hung in the step 10, the controller controls the piston of the jacking servo cylinder to retract for two seconds, the controller controls the second driving device 4 to push the hanging lugs 7 outwards, the controller controls the first driving device 3 to pull the jacking servo cylinder outwards to incline, the jacking leg 2 is lowered by one step after extending along with the piston rod of the jacking servo cylinder, the controller controls the second driving device 4 to pull the hanging lugs 7 inwards, the controller controls the first driving device 3 to push the jacking servo cylinder inwards to be in place, and the hanging lugs 7 are hung in 10.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a tower machine frame climbs and mechanism that descends which characterized in that: the lifting device comprises a lifting device (1), a lifting supporting foot (2), a first driving device (3), a second driving device (4), a third driving device (5) and a controller, wherein one end of the lifting device (1) is fixedly connected to a sleeve frame (6), the other end of the lifting device is hinged to the lifting supporting foot (2), one end of the first driving device (3) is connected to the lifting device (1), the other end of the first driving device is connected to the sleeve frame (6), and the first driving device (3) can drive the lifting device (1) to rotate;
the lifting support leg (2) is hinged with a hanging lug (7), one end of the second driving device (4) is connected to the hanging lug (7), the other end of the second driving device is connected to the lifting support leg (2), and the second driving device (4) can drive the hanging lug (7) to rotate;
The sleeve frame (6) is sleeved on the standard joint (8), a stop shoe (9) is hinged to the sleeve frame (6), one end of the third driving device (5) is connected to the stop shoe (9), the other end of the third driving device is connected to the sleeve frame (6), and the third driving device (5) can drive the stop shoe (9) to rotate;
The standard joint (8) is provided with a step (10) for supporting the hanging lugs (7) and the stop shoes (9), and the step (10) is arranged along the height direction of the standard joint (8);
The controller is used for controlling the jacking device (1), the first driving device (3), the second driving device (4) and the third driving device (5);
The jacking device (1) is a jacking servo oil cylinder, and a piston rod of the jacking servo oil cylinder is hinged with the jacking leg (2);
The cylinder body of the jacking servo oil cylinder is provided with a hoop, and one end of the first driving device (3) is connected to the hoop;
The first driving device (3), the second driving device (4) and the third driving device (5) are all electric push rods.
2. A tower crane cradle climbing and descending mechanism according to claim 1, wherein: one side of the sleeve frame (6) comprises a first cross rod (61) and a second cross rod (62), the first cross rod (61) is arranged above the second cross rod (62), one end of the jacking device (1) is fixedly connected to the first cross rod (61), two stop shoes (9) are hinged to two ends of the first cross rod (61) respectively, two third driving devices (5) are arranged, each third driving device (5) is connected to the first cross rod (61) at the other end, and the other end of the first driving device (3) is connected to the second cross rod (62).
3. A tower crane cradle climbing and descending mechanism according to claim 1, wherein: the jacking leg (2) comprises a jacking cross beam (21) and two connecting plates (22) connected to two ends of the jacking cross beam (21), and two hanging lugs (7) are respectively hinged to the connecting plates (22); the other end of the jacking device (1) is hinged to the jacking cross beam (21).
4. A tower crane cradle climbing and descending mechanism according to claim 1, wherein: the first driving device (3) is vertically connected to the jacking device (1).
5. The application method of the climbing and descending mechanism of the tower crane frame is characterized by comprising the following steps of: when the tower crane hanger climbing and descending mechanism disclosed in any one of claims 1-4 is used, when the hanger climbing, the controller controls the jacking device (1) to jack the hanger (6) for two seconds, the controller controls the third driving device (5) to push the stop shoe (9) outwards, the jacking device (1) jacks the hanger (6) to the last step (10) where the stop shoe (9) is located, the controller controls the third driving device (5) to pull the stop shoe (9) inwards, the jacking device (1) is retracted, the stop shoe (9) is hung in the step (10), the controller controls the jacking device (1) to continuously retract for two seconds, the controller controls the second driving device (4) to push the hanging lugs (7) outwards, the jacking device (1) is controlled to jack the jacking device (1) to the last step (10) where the stop shoe (9) is located, the controller controls the first driving device (3) to pull the hanging lugs (7) inwards, and the hanging lugs (7) are pulled inwards to the first hanging lugs (7) to the original position.
6. The method for using the climbing and descending mechanism of the tower crane set frame according to claim 5, wherein the method comprises the following steps: when the sleeve frame descends, the controller controls the jacking device (1) to jack the sleeve frame (6) for two seconds, the controller controls the third driving device (5) to push the stop shoe (9) outwards, the jacking device (1) is retracted, the sleeve frame (6) descends one step, the controller controls the third driving device (5) to pull the stop shoe (9) inwards back, the stop shoe (9) is hung in the step (10), the controller controls the jacking device (1) to retract for two seconds, the controller controls the second driving device (4) to push the hanging lugs (7) outwards, and the controller controls the first driving device (3) to pull the jacking device (1) outwards to incline, the jacking device (2) stretches out and descends one step along with the jacking device (1), the controller controls the second driving device (4) to pull the hanging lugs (7) inwards, and the controller controls the hanging lugs (3) to pull the hanging lugs (7) inwards back to the original position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910569040.0A CN110203838B (en) | 2019-06-27 | 2019-06-27 | Tower crane frame climbing and descending mechanism and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910569040.0A CN110203838B (en) | 2019-06-27 | 2019-06-27 | Tower crane frame climbing and descending mechanism and application method thereof |
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| CN110203838A CN110203838A (en) | 2019-09-06 |
| CN110203838B true CN110203838B (en) | 2024-07-19 |
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| CN201910569040.0A Active CN110203838B (en) | 2019-06-27 | 2019-06-27 | Tower crane frame climbing and descending mechanism and application method thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112010203B (en) * | 2020-08-11 | 2021-07-30 | 扬戈科技股份有限公司 | Stable anti-shaking device of tower crane |
| CN113387286B (en) * | 2021-07-08 | 2024-06-07 | 中建三局集团有限公司 | Tower crane rotation assembly |
| CN113387285B (en) * | 2021-07-08 | 2024-06-07 | 中建三局集团有限公司 | Tower crane with rotary assembly and lifting large arm |
| CN114476088B (en) * | 2022-01-19 | 2023-03-10 | 东莞市毅新庆江机械制造有限公司 | Parachuting tower |
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| CN210103340U (en) * | 2019-06-27 | 2020-02-21 | 陕西建设机械股份有限公司 | Climbing and descending mechanism for tower crane sleeve frame |
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| CN102390787B (en) * | 2011-07-15 | 2013-10-16 | 浙江省建设机械集团有限公司 | Jacking protection device of self-jacking tower crane and control method of jacking protection device |
| CN103787211B (en) * | 2014-01-27 | 2016-04-06 | 徐州建机工程机械有限公司 | A kind of tower machine jacking anticreep control setup |
| CN103818835B (en) * | 2014-02-26 | 2015-08-19 | 中联重科股份有限公司 | Internal climbing jacking device of tower crane, control method and tower crane |
| CN205241100U (en) * | 2015-11-04 | 2016-05-18 | 徐州建机工程机械有限公司 | Jacking structure in tower machine rocking arm formula |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210103340U (en) * | 2019-06-27 | 2020-02-21 | 陕西建设机械股份有限公司 | Climbing and descending mechanism for tower crane sleeve frame |
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