CN211733665U - Lifting device for transporting goods in high-altitude fan cabin - Google Patents
Lifting device for transporting goods in high-altitude fan cabin Download PDFInfo
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- CN211733665U CN211733665U CN202020239688.XU CN202020239688U CN211733665U CN 211733665 U CN211733665 U CN 211733665U CN 202020239688 U CN202020239688 U CN 202020239688U CN 211733665 U CN211733665 U CN 211733665U
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Abstract
The utility model relates to the technical field of part replacement devices, in particular to a hoisting device for dispatching goods in an overhead fan cabin, which comprises an auxiliary hoist and a main hoist, wherein the auxiliary hoist comprises an auxiliary hoist head pulley, an auxiliary hoist main rod, an auxiliary hoist lifting hook, an auxiliary hoist amplitude-variable steel wire rope, an auxiliary hoist lifting steel wire rope, an auxiliary hoist steering pulley, an auxiliary hoist tower body, an auxiliary hoist micro amplitude-variable hoist, an auxiliary hoist micro lifting hoist, an auxiliary hoist electric swing mechanism and an auxiliary hoist connecting piece, one end of the auxiliary hoist main rod is provided with the auxiliary hoist head pulley, the auxiliary hoist head pulley is connected with the auxiliary hoist lifting steel wire rope, one end of the auxiliary hoist lifting steel wire rope is connected with the auxiliary hoist lifting hook, the auxiliary hoist lifting steel wire rope is connected with the auxiliary hoist micro lifting hoist through the auxiliary hoist steering pulley, the device is stable and reasonable, and the main crane and the auxiliary crane are arranged so that the combined crane can meet the requirements of replacing parts with different weights in fans with different specifications.
Description
Technical Field
The utility model relates to a technical field is changed to the part, specifically is a hoisting accessory that is used for high altitude fan cabin to transfer goods.
Background
Each part of large-scale fan all is very huge, and weight is great, and a tower section of thick bamboo is higher, consequently, ageing, the damage of part in the fan, very difficult when changing the part in the fan cabin, rent large crane expense expensive, and area is very big, needs to destroy the vegetation sometimes.
Disclosure of Invention
An object of the utility model is to provide a hoisting accessory that is used for high altitude fan cabin to transfer goods to solve the problem that provides among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a hoisting device for transporting goods in an overhead fan cabin comprises an auxiliary crane and a main crane, wherein the auxiliary crane comprises an auxiliary crane head pulley, an auxiliary crane main rod, an auxiliary crane hook, an auxiliary crane amplitude-variable steel wire rope, an auxiliary crane hoisting steel wire rope, an auxiliary crane steering pulley, an auxiliary crane tower body, an auxiliary crane micro amplitude-variable winch, an auxiliary crane micro hoisting winch, an auxiliary crane electric swing mechanism and an auxiliary crane connecting piece, one end of the auxiliary crane main rod is provided with the auxiliary crane head pulley, the auxiliary crane head pulley is connected with the auxiliary crane hoisting steel wire rope, one end of the auxiliary crane hoisting steel wire rope is connected with the auxiliary crane hook, the auxiliary crane hoisting steel wire rope is connected to the auxiliary crane micro hoisting winch through the auxiliary crane steering pulley, the auxiliary crane micro hoisting amplitude-variable machine is arranged on the auxiliary crane, the auxiliary crane micro amplitude-variable machine is connected with the auxiliary crane hoisting steel wire rope, the auxiliary crane micro amplitude winch and the auxiliary crane micro lifting winch are both arranged on an auxiliary crane tower body, the other end of the auxiliary crane main rod is connected to the auxiliary crane tower body, the bottom of the auxiliary crane tower body is connected with an auxiliary crane electric swing mechanism, the auxiliary crane electric swing mechanism is connected to an auxiliary crane connecting piece through a bolt, one end of the auxiliary crane connecting piece is connected to a combined crane public stand column, and the bottom of the combined crane public stand column is connected with a combined crane mounting bottom plate;
the main crane comprises a main crane steel wire rope, a main crane steering pulley, a main crane amplitude-variable oil cylinder, a main crane amplitude-variable push rod, a main crane manual rotary mechanism, a main crane tower body, a main crane main rod, a main crane head pulley and a main crane main hook, the top of a common upright post of the combined crane is connected with the main crane manual rotary mechanism through a bolt, the top of the main crane manual rotary mechanism is provided with the main crane tower body, the main crane tower body is connected with one end of the main crane main rod, the other end of the main crane main rod is connected with the main crane head pulley, one side of the main crane head pulley is connected with one end of the main crane amplitude-variable push rod, the other end of the main crane push rod is connected with a connecting piece, the connecting piece is connected with one end of a plurality of main crane oil cylinders, the other end of the main crane oil cylinder is connected with two sides of the main crane steering pulley, the main crane steering pulley is arranged at the top of the main crane amplitude-variable amplitude tower body, the main crane steering pulley is connected with a main crane head pulley through a main crane steel wire rope, and one end of the main crane steel wire rope is connected with a main crane main hook.
Preferably, one side of the bottom of the common upright post of the combined crane is provided with a crane cabin outer steel wire rope switching arm, one end of a main crane steel wire rope penetrating through the crane cabin outer steel wire rope switching arm is connected with a main crane winch in the main crane hoisting device, one side of the main crane hoisting device is provided with a main crane winch control panel, the main crane winch control panel is electrically connected with an auxiliary crane micro amplitude-variable winch, an auxiliary crane micro hoisting winch, an auxiliary crane electric slewing mechanism, a main crane amplitude-variable oil cylinder and the main crane winch in the main crane hoisting device, and the main crane winch control panel is connected with a remote controller.
Preferably, the main crane is connected to the top of the common upright post of the combined crane through a manual slewing mechanism of the main crane.
Preferably, the auxiliary crane is connected to the fan cabin through a combined crane mounting base plate, the fan cabin is provided with a fan lifting hole, the fan cabin is internally provided with a lifting hole hoist, a steel wire rope of the lifting hole hoist penetrates through the fan lifting hole in the fan cabin, the fan cabin is provided with a fan cabin cover, and the fan cabin is arranged on a fan tower barrel.
Preferably, the main crane steel wire rope passes through the crane cabin outer steel wire rope transfer arm, the combined crane common upright post and the main crane steering pulley and is connected to the main crane hook.
Preferably, the main crane hoist is disposed on the ground.
Compared with the prior art, the beneficial effects of the utility model are that: the device is stable and reasonable, the main crane and the auxiliary crane can meet the requirements of replacement of parts with different weights in fans with different specifications, a large-tonnage crane can be assembled in the air during use and used for lifting a heavy object in a fan cabin, the device is extremely strong in inventiveness and suitable for large-area popularization and use, the device thoroughly breaks away from the constraint of a large-scale crawler crane, the product cost is low, the occupied area is small, the requirement on the field is almost eliminated, the transition is rapid, the size is small, the device is flexible to operate, the device is more suitable for being used in the regions where traditional crawler cranes such as mountainous regions cannot reach, and the single-operation comprehensive cost is greatly reduced compared with the price of a rent.
Drawings
FIG. 1 is a schematic structural view of a hoisting device of the present invention;
FIG. 2 is a schematic structural view of the main crane of the present invention;
FIG. 3 is a schematic structural view of the auxiliary crane of the present invention;
fig. 4 is a schematic structural view of a lifting device of the main crane of the present invention;
fig. 5 is one of the schematic structural diagrams of the fan of the present invention;
fig. 6 is a second schematic structural view of the fan of the present invention;
FIG. 7 is a schematic view of the mounting structure of the auxiliary crane of the present invention;
FIG. 8 is a schematic view of the main crane mounting structure of the present invention;
FIG. 9 is a schematic view of the installation structure of the fan and the lifting device of the present invention;
FIG. 10 is a schematic view of a lifting device according to the present invention;
fig. 11 is a second schematic view of the lifting device of the present invention;
fig. 12 is a third schematic view of the lifting device of the present invention;
fig. 13 is a schematic view of the lifting device according to the present invention;
fig. 14 is a second exploded view of the lifting device of the present invention;
fig. 15 is a third schematic view of the fan structure of the present invention.
In the figure: 1. a head pulley of the auxiliary crane; 2. a main rod of the auxiliary crane; 3. a secondary crane hook; 4. the amplitude-variable steel wire rope of the auxiliary crane; 5. the auxiliary crane lifts the steel wire rope; 6. a secondary crane diverting pulley; 7. an auxiliary crane tower body; 8. the auxiliary crane is a miniature variable-amplitude winch; 9. the auxiliary crane is a miniature hoisting winch; 10. an electric swing mechanism of the auxiliary crane; 11. an auxiliary hoist attachment; 12. a combined crane common column; 13. a steel wire rope transfer arm outside the crane cabin; 14. a main crane wire rope; 15. a bottom plate is installed on the combined crane; 16. a main crane diverting pulley; 17. a luffing cylinder of the main crane; 18. a variable-amplitude push rod of the main crane; 19. a manual slewing mechanism of the main crane; 20. a main crane tower body; 21. a main crane rod; 22. a main crane head pulley; 23. a main hook of the main crane; 24. a main crane hoisting device; 25. a main crane winch control panel; 26. a remote controller; 27. a fan nacelle; 28. a fan hanging hole; 29. hoisting a hoist through a hole; 30. a fan nacelle cover; 31. a fan tower; 32. an auxiliary crane; 33. a main crane.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Referring to fig. 1-15, the present invention provides a technical solution: a hoisting device for transporting goods in an overhead fan cabin comprises an auxiliary hoist 32 and a main hoist 33, wherein the auxiliary hoist 32 comprises an auxiliary hoist head pulley 1, an auxiliary hoist main rod 2, an auxiliary hoist lifting hook 3, an auxiliary hoist amplitude-variable steel wire rope 4, an auxiliary hoist lifting steel wire rope 5, an auxiliary hoist steering pulley 6, an auxiliary hoist tower body 7, an auxiliary hoist micro amplitude-variable hoist 8, an auxiliary hoist micro amplitude-variable hoist 9, an auxiliary hoist electric swing mechanism 10 and an auxiliary hoist connecting piece 11, one end of the auxiliary hoist main rod 2 is provided with the auxiliary hoist head pulley 1, the auxiliary hoist head pulley 1 is connected with the auxiliary hoist lifting steel wire rope 5, one end of the auxiliary hoist lifting steel wire rope 5 is connected with the auxiliary hoist lifting hook 3, the auxiliary hoist steel wire rope 5 is connected to the auxiliary hoist micro amplitude-variable hoist 9 through the auxiliary hoist steering pulley 6, the auxiliary hoist micro amplitude-variable hoist 9 is provided with the auxiliary hoist micro amplitude-variable hoist 8, an auxiliary crane micro amplitude-variable winch 8 is connected with an auxiliary crane amplitude-variable steel wire rope 4, the auxiliary crane micro amplitude-variable winch 8 and an auxiliary crane micro lifting winch 9 are both arranged on an auxiliary crane tower body 7, the other end of an auxiliary crane main rod 2 is connected to the auxiliary crane tower body 7, the bottom of the auxiliary crane tower body 7 is connected with an auxiliary crane electric swing mechanism 10, the auxiliary crane electric swing mechanism 10 is connected to an auxiliary crane connecting piece 11 through a bolt, one end of the auxiliary crane connecting piece 11 is connected to a combined crane public stand column 12, and the bottom of the combined crane public stand column 12 is connected with a combined crane mounting bottom plate 15;
the main crane 33 comprises a main crane steel wire rope 14, a main crane diverting pulley 16, a main crane amplitude-variable oil cylinder 17, a main crane amplitude-variable push rod 18, a main crane manual rotation mechanism 19, a main crane tower body 20, a main crane main rod 21, a main crane head pulley 22 and a main crane main hook 23, the top of the combined crane common upright post 12 is connected with the main crane manual rotation mechanism 19 through a bolt, the top of the main crane manual rotation mechanism 19 is provided with the main crane tower body 20, the main crane tower body 20 is connected with one end of the main crane main rod 21, the other end of the main crane main rod 21 is connected with the main crane head pulley 22, one side of the main crane head pulley 22 is connected with one end of the main crane diverting pulley 18, the other end of the main crane amplitude-variable push rod 18 is connected with a connecting piece, the connecting piece is connected with one end of the plurality of main crane amplitude-variable oil cylinders 17, the other end of the main crane amplitude-variable oil cylinders 17 is connected with two sides of the main crane diverting pulley 16, the main crane steering pulley 16 is arranged at the top of the main crane tower body 20, the main crane steering pulley 16 is connected with a main crane head pulley 22 through a main crane steel wire rope 14, and one end of the main crane steel wire rope 14 is connected with a main crane main hook 23.
A crane cabin outer steel wire rope transfer arm 13 is arranged on one side of the bottom of the combined crane public upright post 12, one end of a main crane steel wire rope 14 penetrating through the crane cabin outer steel wire rope transfer arm 13 is connected with a main crane winch in a main crane hoisting device 24, a main crane winch control panel 25 is arranged on one side of the main crane hoisting device 24, the main crane winch control panel 25 is electrically connected with an auxiliary crane micro amplitude-variable winch 8, an auxiliary crane micro amplitude-variable winch 9, an auxiliary crane electric rotating mechanism 10, a main crane amplitude-variable oil cylinder 17 and the main crane winch in the main crane hoisting device 24, and the main crane winch control panel 25 is connected with a remote controller 26.
The main crane 33 is connected to the top of the combined crane common column 12 by the main crane manual swing mechanism 19.
The auxiliary crane 32 is connected in the fan nacelle 27 through the combined crane mounting base plate 15, the fan nacelle 27 is provided with a fan lifting hole 28, the fan nacelle 27 is internally provided with a lifting hole hoist 29, a steel wire rope of the lifting hole hoist 29 penetrates through the fan lifting hole 28 in the fan nacelle 27, the fan nacelle 27 is provided with a fan nacelle cover 30, and the fan nacelle 27 is arranged on a fan tower 31.
The main crane wire rope 14 passes through the crane cabin outer wire rope transfer arm 13, the combined crane common upright post 12 and the main crane diverting pulley 16 and is connected to the main crane main hook 23.
The main crane hoist 24 is located on the ground.
The working principle is as follows: in use, the fan nacelle cover 30 is deflected; the auxiliary crane 32 is lifted from a fan lifting hole 28 to the inside of a fan cabin 27 in a part form by using a lifting hole hoist 29, an auxiliary crane head pulley 1, an auxiliary crane main rod 2, an auxiliary crane lifting hook 3, an auxiliary crane amplitude-variable steel wire rope 4, an auxiliary crane lifting steel wire rope 5, an auxiliary crane steering pulley 6, an auxiliary crane tower body 7, an auxiliary crane micro amplitude-variable winch 8, an auxiliary crane micro amplitude-variable winch 9, an auxiliary crane electric rotating mechanism 10, an auxiliary crane connecting piece 11, a combined crane public upright post 12 and a combined crane mounting bottom plate 15 are manually assembled into the auxiliary crane 32, and the auxiliary crane (32) is mounted in the fan cabin 27 through the combined crane mounting bottom plate 15 at the bottom; the main crane 33 is lifted from the fan lifting hole 28 to the fan cabin 27 in a part form by using a lifting hole hoist 29, the crane cabin outer steel wire rope transfer arm 13, the main crane steel wire rope 14, the main crane steering pulley 16, the main crane amplitude cylinder 17, the main crane amplitude push rod 18, the main crane manual slewing mechanism 19, the main crane tower body 20, the main crane main rod 21, the main crane head pulley 22 and the main crane main hook 23 are manually assembled into the main crane 33 by virtue of the auxiliary crane 32, the main crane 33 is connected to the combined crane common upright post 12 through the main crane manual slewing mechanism 19, and the single part of the main crane 33 cannot be larger than the maximum lifting weight of the lifting hole hoist 29 and cannot be larger than the maximum lifting weight of the auxiliary crane 21; the main crane hoisting device 24 is placed on the ground and fixed, and then the fan cabin cover 30 is fixed, and the main crane steel wire rope 14 is connected to the main crane main hook 23 of the main crane 33 through the crane cabin outer steel wire rope transfer arm 13 on the crane and used for hoisting a heavy object; the main crane hoist 24 may be controlled by a main crane hoist control panel 25 or a remote controller 26; hoisting the fan nacelle cover 30 to the ground by using the main crane 33 (or hoisting the fan nacelle cover 30 by using the main crane 33 and moving the fan nacelle cover 30 laterally until the fan nacelle cover is placed on the fan nacelle 27); the main crane 33 is used for hoisting a large object to be replaced in the fan engine room 27, and hoisting new equipment to complete replacement and maintenance of large goods; hoisting the fan nacelle cover 30 from the ground onto the fan nacelle 27 by using the main crane 33 (or displacing the fan nacelle cover 30 lying on the fan nacelle 27 by using the main crane 33); withdrawing the steel wire rope 14 of the main crane and disassembling the steel wire rope transfer arm 13 outside the crane cabin; disassembling the main crane 33; disassembling the auxiliary crane 32; and resetting the fan cabin cover 30 and finishing maintenance.
It is worth noting that: whole device realizes control to it through main loop wheel machine hoist control panel, because the equipment that main loop wheel machine hoist control panel matches is equipment commonly used, belongs to current mature technology, no longer gives unnecessary here its electric connection relation and concrete circuit structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A hoisting accessory for high altitude fan cabin freight, includes vice loop wheel machine (32) and main loop wheel machine (33), its characterized in that: the auxiliary crane (32) comprises an auxiliary crane head pulley (1), an auxiliary crane main rod (2), an auxiliary crane hook (3), an auxiliary crane amplitude-variable steel wire rope (4), an auxiliary crane hoisting steel wire rope (5), an auxiliary crane steering pulley (6), an auxiliary crane tower body (7), an auxiliary crane micro amplitude-variable winch (8), an auxiliary crane micro hoisting winch (9), an auxiliary crane electric swing mechanism (10) and an auxiliary crane connecting piece (11), wherein one end of the auxiliary crane main rod (2) is provided with the auxiliary crane head pulley (1), the auxiliary crane head pulley (1) is connected with the auxiliary crane hoisting steel wire rope (5), one end of the auxiliary crane hoisting steel wire rope (5) is connected with the auxiliary crane hook (3), the auxiliary crane hoisting steel wire rope (5) is connected to the auxiliary crane micro amplitude-variable hoisting winch (9) through the auxiliary crane steering pulley (6), the auxiliary crane micro hoisting winch (8) is arranged on the auxiliary crane micro hoisting winch (9), an auxiliary crane amplitude-variable steel wire rope (4) is connected to an auxiliary crane micro amplitude-variable winch (8), the auxiliary crane micro amplitude-variable winch (8) and an auxiliary crane micro lifting winch (9) are both arranged on an auxiliary crane tower body (7), the other end of an auxiliary crane main rod (2) is connected to the auxiliary crane tower body (7), the bottom of the auxiliary crane tower body (7) is connected with an auxiliary crane electric swing mechanism (10), the auxiliary crane electric swing mechanism (10) is connected to an auxiliary crane connecting piece (11) through a bolt, one end of the auxiliary crane connecting piece (11) is connected to a combined crane public stand column (12), and the bottom of the combined crane public stand column (12) is connected with a combined crane mounting bottom plate (15);
the main crane (33) comprises a main crane steel wire rope (14), a main crane steering pulley (16), a main crane amplitude-variable oil cylinder (17), a main crane amplitude-variable push rod (18), a main crane manual rotating mechanism (19), a main crane tower body (20), a main crane main rod (21), a main crane head pulley (22) and a main crane main hook (23), the top of the combined crane common upright post (12) is connected with the main crane manual rotating mechanism (19) through a bolt, the top of the main crane manual rotating mechanism (19) is provided with the main crane tower body (20), the main crane tower body (20) is connected with one end of the main crane main rod (21), the other end of the main crane main rod (21) is connected on the main crane head pulley (22), one side of the main crane head pulley (22) is connected with one end of the main crane amplitude-variable push rod (18), the other end of the main crane push rod (18) is connected on a connecting piece, the connecting piece is connected with one end of a plurality of main crane variable amplitude oil cylinders (17), the other end of each main crane variable amplitude oil cylinder (17) is connected to two sides of a main crane steering pulley (16), the main crane steering pulleys (16) are arranged at the top of a main crane tower body (20), the main crane steering pulleys (16) are connected with a main crane head pulley (22) through main crane steel wire ropes (14), and one end of each main crane steel wire rope (14) is connected with a main crane main hook (23).
2. The lifting device for high altitude wind turbine nacelle maneuvering goods according to claim 1, characterized by: one side of the bottom of the combined crane public upright post (12) is provided with a crane cabin outer steel wire rope transfer arm (13), one end of a main crane steel wire rope (14) penetrating through the crane cabin outer steel wire rope transfer arm (13) is connected with a main crane winch in a main crane lifting device (24), one side of the main crane lifting device (24) is provided with a main crane winch control panel (25), the main crane winch control panel (25) is electrically connected with an auxiliary crane micro amplitude-changing winch (8), an auxiliary crane micro amplitude-changing winch (9), an auxiliary crane electric swing mechanism (10), a main crane amplitude-changing oil cylinder (17) and the main crane winch in the main crane lifting device (24), and the main crane winch control panel (25) is connected with a remote controller (26).
3. The lifting device for high altitude wind turbine nacelle maneuvering goods according to claim 1, characterized by: the main crane (33) is connected to the top of the common upright post (12) of the combined crane through a manual slewing mechanism (19) of the main crane.
4. The lifting device for high altitude wind turbine nacelle maneuvering goods according to claim 1, characterized by: the auxiliary crane (32) is connected in the fan cabin (27) through the combined crane mounting base plate (15), a fan lifting hole (28) is formed in the fan cabin (27), a lifting hole hoist (29) is arranged in the fan cabin (27), a steel wire rope of the lifting hole hoist (29) penetrates through the fan lifting hole (28) in the fan cabin (27), a fan cabin cover (30) is arranged on the fan cabin (27), and the fan cabin (27) is arranged on a fan tower drum (31).
5. The lifting device for high altitude wind turbine nacelle maneuvering goods according to claim 1, characterized by: the main crane steel wire rope (14) passes through the crane cabin outer steel wire rope transfer arm (13), the combined crane common upright post (12) and the main crane diverting pulley (16) and is connected to the main crane main hook (23).
6. The lifting device for high altitude wind turbine nacelle maneuvering goods according to claim 1, characterized by: the main crane hoisting device (24) is arranged on the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020239688.XU CN211733665U (en) | 2020-03-02 | 2020-03-02 | Lifting device for transporting goods in high-altitude fan cabin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020239688.XU CN211733665U (en) | 2020-03-02 | 2020-03-02 | Lifting device for transporting goods in high-altitude fan cabin |
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| Publication Number | Publication Date |
|---|---|
| CN211733665U true CN211733665U (en) | 2020-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020239688.XU Active CN211733665U (en) | 2020-03-02 | 2020-03-02 | Lifting device for transporting goods in high-altitude fan cabin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211733665U (en) |
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2020
- 2020-03-02 CN CN202020239688.XU patent/CN211733665U/en active Active
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