CN117185112B - A convenient hoisting accessory for fixed wing unmanned aerial vehicle - Google Patents
A convenient hoisting accessory for fixed wing unmanned aerial vehicle Download PDFInfo
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- CN117185112B CN117185112B CN202311467716.8A CN202311467716A CN117185112B CN 117185112 B CN117185112 B CN 117185112B CN 202311467716 A CN202311467716 A CN 202311467716A CN 117185112 B CN117185112 B CN 117185112B
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- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000004804 winding Methods 0.000 claims description 8
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000005253 cladding Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The application discloses a convenient hoisting accessory for fixed wing unmanned aerial vehicle for establish on fixed wing unmanned aerial vehicle's frock frame, convenient hoisting accessory includes hoist and mount area and two sets of convenient hoisting mechanism, and hoist and mount area's both ends all are formed with hoist and mount passageway, and convenient hoisting mechanism includes: the lifting element is used for being arranged on the tool frame of the fixed wing unmanned aerial vehicle; the mounting frame is fixed with the movable rod of the lifting element; the rotating frame is rotatably arranged on the mounting frame at the end part, is provided with a first working position and a second working position, is outwards turned and opened when in the first working position, and is upwards rotated and folded relative to the mounting frame when in the second working position, and a rotating frame driving assembly is used for driving the rotating frame to rotate; this application can be convenient and fast with hoist and mount area cladding on the fuselage, the hook that cooperates crane or line to hang can realize convenient lifting by crane the operation.
Description
Technical Field
The invention relates to the field of unmanned aerial vehicles, in particular to a convenient lifting device for a fixed wing unmanned aerial vehicle.
Background
The target drone belongs to a fixed wing unmanned aerial vehicle, the mass of the target drone is usually hundreds of kilograms, the lower part of the fuselage is usually covered by a lifting belt during lifting, two ends of the lifting belt are hooked by hooks of a crane or a crane, and the target drone is lifted by the lifting belt after the hooks are moved upwards.
The lifting mode is inconvenient to operate, and is difficult for workers to install the lifting belt, so that a plurality of workers are required to cooperate.
Disclosure of Invention
The invention aims at the problems and provides a convenient lifting device for a fixed wing unmanned aerial vehicle.
The technical scheme adopted by the invention is as follows:
a convenient hoisting accessory for fixed wing unmanned aerial vehicle for establish on fixed wing unmanned aerial vehicle's frock frame, convenient hoisting accessory includes hoist and mount area and two sets of convenient hoisting mechanism, the both ends in hoist and mount area all are formed with hoist and mount passageway, convenient hoisting mechanism includes:
the lifting element is used for being arranged on the tool frame of the fixed wing unmanned aerial vehicle;
the mounting frame is fixed with the movable rod of the lifting element;
rotating frame, tip rotation is installed on the mounting bracket, the rotating frame has first position and second position, the rotating frame is in first position time, and the rotating frame is outwards turned over and is opened, the rotating frame is in the second position time, and the rotating frame upwards rotates relative mounting bracket and folds, and
the rotating frame driving assembly is used for driving the rotating frame to rotate;
the two groups of convenient hoisting mechanisms are oppositely arranged, one end of the hoisting belt is detachably arranged at one end, far away from the mounting frame, of one rotating frame, the other end of the hoisting belt is detachably arranged at one end, far away from the mounting frame, of the other rotating frame, and the middle area of the hoisting belt naturally sags; when the rotating frame is in the second working position, two ends of the lifting belt are close to each other, and when the rotating frame is switched to the first working position after the lifting belt is limited, the lifting belt and the rotating frame are separated from each other.
The tool frame is a frame for placing a fixed wing unmanned aerial vehicle (target drone), and when the tool frame is used, two convenient hoisting devices are respectively arranged on the tool frame front and back. When the fixed wing unmanned aerial vehicle does not need to be lifted, the rotating frame is in the first working position, and the movable rod of the lifting element is at the lowest position. When the fixed wing unmanned aerial vehicle is required to be lifted, the piston rod of the lifting element moves upwards, the middle area of the lifting belt is located under the aircraft fuselage, then the rotating frame driving assembly works, the rotating frames are switched to the second working position, the two rotating frames rotate upwards relative to the mounting frame to be folded, the two ends of the lifting belt are close to each other and located above the fuselage, after the crane or a hook of the crane respectively passes through the two lifting channels, the lifting mechanism is reset conveniently (the movable rod moves downwards and the rotating frames are switched to the first working position), and the fixed wing unmanned aerial vehicle can be lifted quickly through the lifting hook.
In practical use, the lifting element is preferably arranged on the tool rack in a sliding manner, so that the front and back positions can be adjusted as required, and the lifting belt and the machine body are convenient to fit in positions.
This application can be convenient and fast with hoist and mount area cladding on the fuselage, the hook that cooperates crane or line to hang can realize convenient lifting by crane the operation.
In practical use, the turret drive assembly may be a motor assembly.
In one embodiment of the present invention, the lifting belt further comprises a hollow elastic support, wherein the elastic support is used for being placed in the lifting channel to prop open the lifting channel.
The elastic support can prop open the hoisting channel, so that the hoisting channel does not need to be opened manually, and the hook can rapidly pass through the hoisting channel relative to the fact that the elastic support is not arranged. When in actual use, the elastic support frame is driven by the hook to move upwards together with the lifting belt.
In practical use, the rotating element can be a motor assembly or a steering engine assembly.
In one embodiment of the present invention, one end of the turret, which is far away from the mounting frame, is provided with a rotating plate and a rotating element, the end of the lifting belt is arranged on the rotating plate, and the rotating element is used for driving the rotating plate to rotate, so that when the turret is in the second working position, the central lines of the two lifting channels at the two ends of the lifting belt are coincident.
The center lines of the two hoisting channels can be overlapped through the rotating plate and the rotating element, so that the hooks can hook the two hoisting channels at one time, and the operation is more convenient.
In one embodiment of the present invention, the end of the lifting belt is magnetically engaged with the turret.
The magnetic attraction mode is convenient for positioning the lifting belt and separating the lifting belt from the rotating frame after being hooked by the hook.
In one embodiment of the present invention, the rotating frame has an arc surface, the lifting belt is magnetically engaged with the arc surface of the rotating frame, and the arc surface faces the fuselage of the fixed wing unmanned aerial vehicle when the rotating frame is in the second working position.
The design of arcwall face can prevent to interfere with fixed wing unmanned aerial vehicle's fuselage when upwards rotating.
In one embodiment of the invention, a first magnetic medium is arranged on one side of the lifting belt matched with the rotating frame, a second magnetic medium is arranged on the rotating frame, and the first magnetic medium is in magnetic attraction fit with the second magnetic medium.
In practical use, one of the first magnetic attraction medium and the second magnetic attraction medium is a magnet, the other is iron, or both are magnets.
In one embodiment of the present invention, a turret driving assembly includes:
the elastic reset piece is arranged between the mounting frame and the rotating frame and is used for enabling the rotating frame to have a rotating trend of rotating towards the first working position;
the winding motor is arranged on the mounting frame;
one end of the control rope is connected with the rotating frame, and the other end of the control rope is connected with the winding motor.
When in actual use, the elastic reset piece can be a tension spring or a torsion spring, and when the elastic reset piece is the tension spring, the tension spring is arranged on the outer side, one end of the tension spring is connected with the mounting frame, and the other end of the tension spring is connected with the rotating frame. And when the torsion spring is arranged on the rotating shafts of the mounting frame and the rotating frame.
In one embodiment of the present invention, the rotating frame and the mounting frame are provided with limiting holes, and the control ropes pass through the limiting holes.
In one embodiment of the present invention, the two sets of turret driving assemblies share a single winding motor.
In one embodiment of the present invention, the lifting elements and the mounting frame are shared by two sets of convenient lifting mechanisms.
In one embodiment of the invention, the device further comprises a flexible resistance-increasing pad, wherein the lower end of the flexible resistance-increasing pad is provided with a limiting opening clamped in the middle area of the lifting belt, and the flexible resistance-increasing pad is used for preventing the lifting belt from moving along the machine body direction.
The beneficial effects of the invention are as follows: this application can be convenient and fast with hoist and mount area cladding on the fuselage, the hook that cooperates crane or line to hang can realize convenient lifting by crane the operation.
Drawings
FIG. 1 is a schematic view of two convenient lifting devices arranged one behind the other;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a schematic illustration of facilitating the cooperation of a lifting device with a fixed wing drone;
FIG. 4 is a schematic illustration of the coincidence of the center lines of two hoisting channels at both ends of the hoisting belt after rotation of the rotating plate;
FIG. 5 is a schematic view of a lifting strap;
fig. 6 is a schematic view of a convenient lifting device with a flexible resistance-increasing pad.
The reference numerals in the drawings are as follows:
100. fixed wing unmanned aerial vehicle; 101. a body; 10. a convenient lifting device; 1. hoisting the belt; 11. hoisting the channel; 12. an elastic support; 13. a first magnetic medium; 2. a convenient lifting mechanism; 21. a lifting element; 211. a movable rod; 22. a mounting frame; 221. a limiting hole; 23. a rotating frame; 231. a rotating plate; 232. a rotating element; 233. an arc surface; 24. a turret drive assembly; 241. a winding motor; 242. a control rope; 3. a flexible resistance-increasing pad; 31. and a limit opening.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put when the product of the application is used, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, a convenient lifting device 10 for a fixed wing unmanned aerial vehicle 100 is configured on a tool rack of the fixed wing unmanned aerial vehicle 100, the convenient lifting device 10 includes a lifting belt 1 and two groups of convenient lifting mechanisms 2, two ends of the lifting belt 1 are respectively formed with a lifting channel 11, and the convenient lifting mechanisms 2 include:
a lifting element 21 for being arranged on a tool rack of the fixed wing unmanned aerial vehicle 100;
a mounting frame 22 fixed to the movable rod 211 of the lifting member 21;
a rotating frame 23, the end part of which is rotatably mounted on the mounting frame 22, the rotating frame 23 having a first working position and a second working position, the rotating frame 23 being turned outwards and opened when the rotating frame 23 is in the first working position, the rotating frame 23 being rotated upwards and folded relative to the mounting frame 22 when the rotating frame 23 is in the second working position, and
a turret driving assembly 24 for driving the turret 23 to rotate;
two groups of convenient hoisting mechanisms 2 are oppositely arranged, one end of the hoisting belt 1 is detachably arranged at one end, far away from the mounting frame 22, of one rotating frame 23, the other end of the hoisting belt 1 is detachably arranged at one end, far away from the mounting frame 22, of the other rotating frame 23, and the middle area of the hoisting belt 1 naturally sags; when the turret 23 is in the second operating position, the two ends of the hoisting belt 1 are close to each other, and when the turret 23 is switched to the first operating position after the hoisting belt 1 is limited, the hoisting belt 1 and the turret 23 are separated from each other.
The tool rack is a rack for placing the fixed wing unmanned aerial vehicle 100 (target drone), and when the tool rack is used, the two convenient lifting devices 10 are respectively arranged on the tool rack front and back. When the fixed wing unmanned aerial vehicle 100 does not need to be lifted, the rotating frame 23 is in the first working position, and the movable rod 211 of the lifting element 21 is at the lowest position. When the fixed wing unmanned aerial vehicle 100 needs to be lifted, the piston rod of the lifting element 21 moves upwards, the middle area of the lifting belt 1 is located under the aircraft fuselage 101, then the rotating frame driving assembly 24 works to enable the rotating frames 23 to be switched to the second working position, the two rotating frames 23 rotate upwards relative to the mounting frame 22 to be folded, finally the two ends of the lifting belt 1 are close to each other and located above the fuselage 101, after the hooks of a crane or a crane respectively pass through the two lifting channels 11, the lifting mechanism 2 is reset conveniently (the movable rod 211 moves downwards and the rotating frames 23 are switched to the first working position), and the fixed wing unmanned aerial vehicle 100 can be lifted quickly through the lifting hooks.
In practical use, the lifting element 21 is preferably slidably disposed on the tool rack, so that the front and rear positions can be adjusted as required, and the position where the lifting belt 1 is matched with the machine body 101 is convenient.
This application can be convenient and fast with hoist and mount area 1 cladding on fuselage 101, the hook that cooperates crane or line to hang can realize convenient lifting by crane the operation.
In practice, the turret drive assembly 24 may be a motor assembly.
As shown in fig. 1 and 2, in the present embodiment, the lifting belt 1 further includes a hollow elastic support 12, and the elastic support 12 is used to be placed in the lifting channel 11 to prop the lifting channel 11 open. The elastic support 12 can prop open the hoisting channel 11, so that the hook can quickly pass through the hoisting channel without being manually opened, compared with the hoisting channel without the elastic support 12. In actual use, the elastic support 12 together with the lifting belt 1 is driven by the hook to move upwards.
In practice, the rotating element 232 may be a motor assembly or a steering engine assembly.
As shown in fig. 2, in the present embodiment, the end of the turret 23 remote from the mounting frame 22 is provided with a rotation plate 231 and a rotation member 232, and the end of the hoisting belt 1 is disposed on the rotation plate 231, and the rotation member 232 is used to drive the rotation plate 231 to rotate, so that when the turret 23 is in the second working position, the center lines of the two hoisting passages 11 at the two ends of the hoisting belt 1 are coincident, as shown in fig. 4.
The rotation plate 231 and the rotation element 232 can realize the coincidence of the central lines of the two hoisting channels 11, so that the hook can hook the two hoisting channels 11 at one time, and the operation is more convenient.
In this embodiment, the end of the hoisting belt 1 is magnetically engaged with the turret 23. The magnetic attraction mode is convenient for positioning the lifting belt 1 and separating the lifting belt from the rotating frame 23 after being hooked by the hook.
As shown in fig. 1 and 2, in the present embodiment, the rotating frame 23 has an arc surface 233, and the lifting belt 1 magnetically engages with the arc surface 233 of the rotating frame 23, and the arc surface 233 faces the fuselage 101 of the fixed wing unmanned aerial vehicle 100 when the rotating frame 23 is in the second working position.
The arcuate surface 233 is designed to prevent interference with the fuselage 101 of the fixed wing unmanned aerial vehicle 100 when rotated upward.
As shown in fig. 5, in this embodiment, a first magnetic medium 13 is disposed on a side of the hoisting belt 1 that cooperates with the rotating frame 23, and a second magnetic medium (not shown in the drawing) is disposed on the rotating frame 23, and the first magnetic medium and the second magnetic medium are magnetically mated.
In practical use, one of the first magnetic attraction medium and the second magnetic attraction medium is a magnet, the other is iron, or both are magnets.
In this embodiment, the turret driving assembly 24 includes:
an elastic restoring member (not shown in the drawings) is disposed between the mounting frame 22 and the rotating frame 23, for enabling the rotating frame 23 to have a rotation tendency toward the first working position, and in actual use, the elastic restoring member may be a tension spring or a torsion spring, and in case of the tension spring, the tension spring is disposed at the outer side, one end is connected with the mounting frame 22, and the other end is connected with the rotating frame 23. In the case of torsion springs, are provided on the rotation shafts of the mounting frame 22 and the rotating frame 23;
a winding motor 241 disposed on the mounting frame 22;
one end of a control rope 242 is connected to the turret 23, and the other end is connected to the winding motor 241.
As shown in fig. 2, in the present embodiment, the rotating frame 23 and the mounting frame 22 are provided with a limiting hole 221, and the control rope 242 passes through the limiting hole 221.
In other embodiments, two sets of turret drive assemblies 24 share a single wrap motor 241. Further, in other embodiments, the lifting element 21 and the mounting frame 22 are shared by two sets of convenient lifting mechanisms 2. The arrangement structure is more compact and the cost is low.
As shown in fig. 6, in practical use, the flexible resistance-increasing pad 3 is preferably further included, and a limiting opening 31 clamped in the middle area of the lifting belt 1 is formed at the lower end of the flexible resistance-increasing pad 3.
The fixed wing unmanned aerial vehicle 100 of this embodiment is the target aircraft, and the quality is two hundred kilograms, consequently can lift by crane the operation through hoist and mount area 1 and the contact of fuselage 101, and flexible increases the frictional force that hinders pad 3 can increase with the fuselage 101, prevents hoist and mount area 1 axial displacement (along fuselage 101 direction drunkenness). In actual use, the width of the flexible resistance increasing pad 3 is larger than that of the lifting belt 1 and is 3-5 times of that of the lifting belt 1.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover all equivalent structures as modifications within the scope of the invention, either directly or indirectly, as may be contemplated by the present invention.
Claims (10)
1. A convenient hoisting accessory for fixed wing unmanned aerial vehicle, its characterized in that for establish on fixed wing unmanned aerial vehicle's frock frame, convenient hoisting accessory includes hoist and mount area and two sets of convenient hoisting mechanism, the both ends in hoist and mount area all are formed with hoist and mount passageway, convenient hoisting mechanism includes:
the lifting element is used for being arranged on the tool frame of the fixed wing unmanned aerial vehicle;
the mounting frame is fixed with the movable rod of the lifting element;
rotating frame, tip rotation is installed on the mounting bracket, the rotating frame has first position and second position, the rotating frame is in first position time, and the rotating frame is outwards turned over and is opened, the rotating frame is in the second position time, and the rotating frame upwards rotates relative mounting bracket and folds, and
the rotating frame driving assembly is used for driving the rotating frame to rotate;
the two groups of convenient hoisting mechanisms are oppositely arranged, one end of the hoisting belt is detachably arranged at one end, far away from the mounting frame, of one rotating frame, the other end of the hoisting belt is detachably arranged at one end, far away from the mounting frame, of the other rotating frame, and the middle area of the hoisting belt naturally sags; when the rotating frame is in the second working position, two ends of the lifting belt are close to each other, and when the rotating frame is switched to the first working position after the lifting belt is limited, the lifting belt and the rotating frame are separated from each other.
2. The convenient lifting device for a fixed wing unmanned aerial vehicle of claim 1, wherein the lifting strap further comprises a hollow elastic support for placement within the lifting channel to prop open the lifting channel.
3. A convenient lifting device for a fixed wing unmanned aerial vehicle as claimed in claim 1 or claim 2, wherein the end of the turret remote from the mounting frame is provided with a rotating plate on which the ends of the lifting strap are arranged and a rotating element for driving the rotating plate in rotation such that when the turret is in the second operating position the centre lines of the two lifting channels at the ends of the lifting strap coincide.
4. A convenient lifting device for a fixed wing unmanned aerial vehicle as claimed in claim 3, wherein the ends of the lifting straps magnetically engage with the turret.
5. The convenient lifting device for a fixed wing unmanned aerial vehicle of claim 4, wherein the turret has an arcuate surface, the lifting strap magnetically engaging the arcuate surface of the turret, the arcuate surface facing the fuselage of the fixed wing unmanned aerial vehicle when the turret is in the second operating position.
6. The convenient lifting device for the fixed wing unmanned aerial vehicle of claim 5, wherein the side of the lifting belt matched with the rotating frame is provided with a first magnetic medium, the rotating frame is provided with a second magnetic medium, and the first magnetic medium is magnetically matched with the second magnetic medium.
7. The convenient lifting apparatus for a fixed wing unmanned aerial vehicle of claim 1, wherein the turret drive assembly comprises:
the elastic reset piece is arranged between the mounting frame and the rotating frame and is used for enabling the rotating frame to have a rotating trend of rotating towards the first working position;
the winding motor is arranged on the mounting frame;
one end of the control rope is connected with the rotating frame, and the other end of the control rope is connected with the winding motor.
8. The convenient lifting device for a fixed wing unmanned aerial vehicle of claim 7, wherein the turret and the mounting bracket are provided with limiting holes through which the control ropes pass.
9. The convenient lifting apparatus for a fixed wing unmanned aerial vehicle of claim 7, wherein the two sets of turret drive assemblies share a single wind-up motor;
the lifting elements and the mounting frame are shared by the two groups of convenient lifting mechanisms.
10. The convenient lifting device for the fixed wing unmanned aerial vehicle of claim 1, further comprising a flexible resistance-increasing pad, wherein the lower end of the flexible resistance-increasing pad is provided with a limiting opening clamped into the middle area of the lifting belt, and the flexible resistance-increasing pad is used for preventing the lifting belt from moving along the direction of the fuselage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311467716.8A CN117185112B (en) | 2023-11-07 | 2023-11-07 | A convenient hoisting accessory for fixed wing unmanned aerial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311467716.8A CN117185112B (en) | 2023-11-07 | 2023-11-07 | A convenient hoisting accessory for fixed wing unmanned aerial vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN117185112A CN117185112A (en) | 2023-12-08 |
| CN117185112B true CN117185112B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311467716.8A Active CN117185112B (en) | 2023-11-07 | 2023-11-07 | A convenient hoisting accessory for fixed wing unmanned aerial vehicle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1511251A (en) * | 1975-06-12 | 1978-05-17 | Fisons Ltd | Sling assembly |
| CN103274288A (en) * | 2013-06-05 | 2013-09-04 | 北京空间飞行器总体设计部 | Suspending and releasing system used for impact test of lander |
| AT520091B1 (en) * | 2017-10-30 | 2019-01-15 | Hans Kuenz Gmbh | Transport device for a crane |
| CN110562840A (en) * | 2019-09-17 | 2019-12-13 | 中国化学工程第六建设有限公司 | construction method for turning large-scale equipment by using crane and pulley block |
| CN217894865U (en) * | 2022-07-04 | 2022-11-25 | 南京大华特种带织造有限公司 | Novel round annular sling |
-
2023
- 2023-11-07 CN CN202311467716.8A patent/CN117185112B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1511251A (en) * | 1975-06-12 | 1978-05-17 | Fisons Ltd | Sling assembly |
| CN103274288A (en) * | 2013-06-05 | 2013-09-04 | 北京空间飞行器总体设计部 | Suspending and releasing system used for impact test of lander |
| AT520091B1 (en) * | 2017-10-30 | 2019-01-15 | Hans Kuenz Gmbh | Transport device for a crane |
| CN110562840A (en) * | 2019-09-17 | 2019-12-13 | 中国化学工程第六建设有限公司 | construction method for turning large-scale equipment by using crane and pulley block |
| CN217894865U (en) * | 2022-07-04 | 2022-11-25 | 南京大华特种带织造有限公司 | Novel round annular sling |
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| Publication number | Publication date |
|---|---|
| CN117185112A (en) | 2023-12-08 |
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