CN114877023B - Telescopic arm type drag chain structure - Google Patents
Telescopic arm type drag chain structure Download PDFInfo
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- CN114877023B CN114877023B CN202210397438.2A CN202210397438A CN114877023B CN 114877023 B CN114877023 B CN 114877023B CN 202210397438 A CN202210397438 A CN 202210397438A CN 114877023 B CN114877023 B CN 114877023B
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- chain
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G13/00—Chains
- F16G13/12—Hauling- or hoisting-chains so called ornamental chains
- F16G13/16—Hauling- or hoisting-chains so called ornamental chains with arrangements for holding electric cables, hoses, or the like
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a telescopic arm type drag chain structure, which comprises: drag chain and multiunit support self-return device. The drag chain is annularly arranged on one side of the telescopic arm along the telescopic direction of the telescopic arm so as to form an upper chain and a lower chain which are arranged at intervals relatively up and down. The supporting self-return devices are sequentially arranged at intervals along the towing direction of the towing chain, the mounting ends of the supporting self-return devices are connected with the telescopic arms, the opposite supporting ends of the supporting self-return devices extend outwards and extend to the lower part of the upper chain so as to roll and support the upper chain, and the supporting self-return devices are arranged in a deflection manner along the towing direction of the towing chain so as to deflect towards the towing side of the towing chain under the stress in the towing process of the towing chain, so that the towing chain is avoided, and the supporting self-return device automatically returns to the initial position after the towing chain is towed. The telescopic arm type drag chain structure can ensure that an upper chain is supported, so that friction between the upper chain and a lower chain is avoided, the service life of the drag chain is prolonged, the risk of pipeline damage is reduced, and the problems of the existing telescopic arm type drag chain system are solved.
Description
Technical Field
The invention relates to the field of engineering machinery with telescopic arm frames, in particular to a telescopic arm type drag chain structure.
Background
At present, the telescopic arm drag chain structure is characterized in that the upper drag chain is generally unsupported, the rigidity of the drag chain is mainly used, the front end of the upper drag chain is a pipe, the drag chain is supported by the rigidity of the pipe, or the plastic drag chain is replaced by a metal drag chain with higher rigidity. The risks of abrasion and pipeline damage of the drag chain caused by mutual friction of the drag chain at the upper layer and the lower layer due to dead weight sagging of the drag chain in the telescopic process of the telescopic arm are not thoroughly solved by the various measures, and particularly in the case of longer drag chain with a long arm frame. At present, another technology is that the front end of the upper layer drag chain adopts a metal sleeve, the metal sleeve synchronously stretches and contracts along with the movement process of the telescopic drag chain of the arm support, so that the risk is solved to a certain extent, but the weight increase of the method affects the load of the arm support, and the manufacturing cost is relatively high.
Disclosure of Invention
The invention provides a telescopic boom type drag chain structure, which aims to solve the technical problems that drag chains on upper and lower layers of an existing telescopic boom are rubbed with each other, so that the drag chains are worn and the pipeline is damaged, the whole weight of the telescopic boom is increased, and the manufacturing cost is high.
The technical scheme adopted by the invention is as follows:
a telescopic boom drag chain structure comprising: a drag chain and a plurality of groups of support self-return devices; the drag chain is annularly arranged on one side of the telescopic arm along the telescopic direction of the telescopic arm so as to form an upper chain and a lower chain which are oppositely arranged at intervals up and down; the supporting self-return devices are sequentially arranged at intervals along the towing direction of the towing chain, the mounting ends of the supporting self-return devices are connected with the telescopic arms, the opposite supporting ends of the supporting self-return devices extend outwards and extend to the lower part of the upper chain so as to roll and support the upper chain, and the supporting self-return devices are arranged in a deflection manner along the towing direction of the towing chain so as to deflect towards the towing side of the towing chain under the stress in the towing process of the towing chain, so that the towing chain is avoided, and the supporting self-return device automatically returns to the initial position after the towing chain is towed.
Further, the telescopic arm comprises a mounting arm and an extending arm which is sequentially nested and mounted in the mounting arm; the multiple groups of the self-return supporting devices are sequentially arranged at intervals along the length direction of the mounting arm, and the mounting ends of the self-return supporting devices are fixed with the outer wall surface of the mounting arm.
Further, the self-return supporting device comprises a connecting seat fixed with the mounting arm, a swing arm rotatably arranged on the connecting seat to deflect towards the towing direction of the drag chain, a rotating wheel for rolling and supporting the upper chain, and a return spring for automatically returning the deflected swing arm; the rotating wheel is arranged on the swing arm; the return spring is connected between the connecting seat and the swing arm.
Further, the connecting seat comprises a mounting plate detachably fixed with the outer wall surface of the mounting arm, a support plate vertically supported on the mounting plate and a mounting shaft connected to the mounting plate in parallel; the swing arm is rotatably arranged on the outer circle of the installation shaft; the return spring is a telescopic spring which is arranged in a telescopic way along the length direction, and two ends of the telescopic spring are respectively connected with the support plate and the swing arm.
Further, the connecting seat comprises a mounting plate detachably fixed with the outer wall surface of the mounting arm, two support plates which are arranged at intervals and are vertically connected with the mounting plate, and a mounting shaft with two ends respectively arranged on the two support plates; the swing arm is rotatably arranged on the outer circle of the installation shaft; the return spring is a torsion spring, the torsion spring is arranged on the outer circle of the installation shaft, the first end of the torsion spring elastically abuts against the installation plate to limit, and the second end of the torsion spring elastically abuts against the swing arm.
Further, the swing arm is L-shaped, the end part of the long shaft section with longer length is rotatably arranged on the outer circle of the installation shaft, and the top end of the short shaft section with shorter length than the long shaft section is provided with a rotating wheel; two ends of the telescopic spring are respectively connected with the support plate and the long shaft section; the second end of the torsion spring resiliently abuts the long shaft section.
Further, the rotating wheel comprises a mounting column fixed with the swing arm, a rotating wheel body rotatably arranged at the top end of the mounting column, and a plurality of rolling shafts for rolling and supporting an upper chain; the rollers are arranged on the runner body at intervals, and each roller is rotatably arranged to rollingly support the upper chain.
Further, the rotating wheel body comprises a rotating wheel body which is hollow disc-shaped and is provided with an opening at the upper end, and a center column vertically supported at the center of the rotating wheel body; the two ends of each roller are respectively rotatably supported on the rotating wheel body and the center column.
Further, the plurality of rollers are radially arranged along the radial direction of the rotating wheel body.
Further, the outer of the rotating wheel is covered with an elastic wrapper.
The invention has the following beneficial effects:
when the telescopic arm type drag chain structure works, when the drag chain is not towed, the plurality of groups of support self-return devices are matched to support the upper chain so as to prevent the upper chain from falling down and contacting the lower chain, further the upper chain and the lower chain rub each other in the towing process of the drag chain, and meanwhile, the support self-return devices can deflect left and right along the towing direction of the drag chain and can automatically return to the initial position after the drag chain is towed; when the telescopic arm stretches out, the drag chain is driven to move forwards, when the drag chain contacts the self-return supporting device, the drag chain continues to move forwards, under the action of the driving force of the drag chain, the self-return supporting device deflects towards the dragging side of the drag chain, so that the drag chain is prevented from being pulled out to enable the drag chain to continue to move forwards, and when the drag chain is separated from the self-return supporting device, the self-return supporting device automatically returns to the initial position through the self-return function; when the telescopic boom is retracted, the supporting self-return device deflects towards the towed side of the towing chain when the towing chain is contacted with the supporting self-return device, and the specific moving process is similar to the action of the telescopic boom when the telescopic boom is extended, but the deflection direction is opposite, so that the telescopic boom type towing chain structure can ensure that the upper chain is supported no matter the telescopic boom is retracted or extended, thereby avoiding the friction between the upper chain and the lower chain, prolonging the service life of the towing chain, reducing the risk of pipeline damage, solving the problem of friction between the upper layer and the lower layer of the towing chain of the traditional telescopic boom type towing chain system, and particularly having the advantage facing the telescopic boom with large telescopic travel; the telescopic arm type drag chain has the advantages of simple integral structure, lighter weight and lower manufacturing cost.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of a fully retracted state of a telescoping arm;
FIG. 2 is a schematic top view of the structure of FIG. 1;
FIG. 3 is a schematic view of a telescoping arm extension process state;
FIG. 4 is a schematic view of the front view of the self-retracting device of FIG. 1;
FIG. 5 is a schematic left-hand view of the structure of FIG. 4;
FIG. 6 is a schematic top view of the structure of FIG. 5;
fig. 7 is a schematic view of another embodiment of the self-retracting device of fig. 1.
Description of the drawings
1. A drag chain; 11. an upper chain; 12. a lower chain; 2. supporting a self-return device; 21. a connecting seat; 211. a mounting plate; 212. a support plate; 213. a mounting shaft; 22. a swing arm; 23. a rotating wheel; 231. a mounting column; 232. a runner body; 233. a roller; 24. a return spring; 3. a telescoping arm; 31. a mounting arm; 32. an extension arm.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.
Referring to fig. 1-3, a preferred embodiment of the present invention provides a telescopic arm type drag chain structure comprising: a drag chain 1 and a plurality of groups of support self-return devices 2. The drag chain 1 is annularly arranged on one side of the telescopic arm 3 along the telescopic direction of the telescopic arm 3 to form an upper chain 11 and a lower chain 12 which are arranged at intervals up and down. The supporting self-return devices 2 are sequentially arranged at intervals along the towing direction of the towing chain 1, the mounting ends of the supporting self-return devices 2 are connected with the telescopic arms 3, the opposite supporting ends of the supporting self-return devices extend outwards and extend to the lower side of the upper chain 11 so as to rollingly support the upper chain 11, and the supporting self-return devices 2 are arranged in a deflection manner along the towing direction of the towing chain 1 so as to deflect towards the towing side of the towing chain 1 under the stress in the towing process of the towing chain 1, so that the towing chain 1 is avoided, and the supporting self-return device automatically returns to the initial position after the towing chain 1 is towed.
When the telescopic arm type drag chain structure works, as shown in fig. 1 and 2, when the drag chain 1 is not towed, a plurality of groups of support self-return devices 2 cooperate to support an upper chain 11 so as to prevent the upper chain 11 from falling down and contacting a lower chain 12, further the upper chain 11 and the lower chain 12 rub against each other in the towing process of the drag chain 1, and simultaneously the support self-return devices 2 can deflect left and right along the towing direction of the drag chain 1 and can automatically return to an initial position after the drag chain 1 is towed; as shown in fig. 3, when the telescopic arm 3 stretches out, the drag chain 1 is driven to move forward, when the drag chain 1 contacts the self-return supporting device 2, the drag chain 1 continues to move forward, under the action of the pushing force of the drag chain 1, the self-return supporting device 2 deflects towards the dragging side of the drag chain 1, so that the drag chain 1 is prevented from being moved away, the drag chain 1 continues to move forward, and when the drag chain 1 is separated from the self-return supporting device 2, the self-return supporting device 2 automatically returns to the initial position through the self-return function; when the telescopic boom 3 is retracted, the drag chain 1 is contacted with the self-supporting return device 2, the self-supporting return device is deflected towards the towed side of the drag chain 1, the specific moving process is similar to the action of the telescopic boom 3 when the telescopic boom 3 is extended, and the deflection direction is opposite, so that the telescopic boom type drag chain structure can ensure that the upper chain 11 is supported no matter the telescopic boom 3 is retracted or extended, thereby avoiding the friction between the upper chain 11 and the lower chain 12, prolonging the service life of the drag chain, reducing the risk of pipeline damage, solving the problem of drag chain upper and lower friction of the traditional telescopic boom type drag chain system, and particularly having the advantage facing the telescopic boom with large telescopic travel; the telescopic arm type drag chain has the advantages of simple integral structure, lighter weight and lower manufacturing cost.
Alternatively, as shown in fig. 1 and 3, the telescopic arm 3 includes a mounting arm 31, and an extension arm 32 which is nested in turn within the mounting arm 31. The multiple groups of support self-return devices 2 are sequentially arranged at intervals along the length direction of the mounting arm 31, and the mounting ends of the support self-return devices 2 are fixed with the outer wall surface of the mounting arm 31. The multiple groups of support self-return devices 2 are sequentially arranged at intervals along the length direction of the mounting arm 31, so that the upper chain 11 and the lower chain 12 are effectively prevented from rubbing against each other in the towing process of the towing chain 1.
Alternatively, as shown in fig. 4 and 5, the self-return supporting device 2 includes a connecting base 21 fixed to a mounting arm 31, a swing arm 22 rotatably mounted on the connecting base 21 to deflect in the towing direction of the drag chain 1, a rotating wheel 23 for rollingly supporting the upper chain 11, and a return spring 24 for automatically returning the deflected swing arm 22. The turning wheel 23 is mounted on the swing arm 22. A return spring 24 is connected between the connection base 21 and the swing arm 22. When the drag chain 1 is contacted with the rotating wheel 23 supporting the self-return device 2, the swinging arm 22 supporting the self-return device 2 deflects towards the dragging side of the drag chain 1 under the action of the driving force of the drag chain 1, so that the drag chain 1 is prevented from being separated to enable the drag chain 1 to continuously move forwards, and when the drag chain 1 is separated from the rotating wheel 23 supporting the self-return device 2, the self-return device 2 automatically returns to the initial position through the return spring 24.
In the first embodiment of this alternative, as shown in fig. 5, the connection base 21 includes a mounting plate 211 detachably fixed to the outer wall surface of the mounting arm 31, a support plate 212 vertically supported on the mounting plate 211, and a mounting shaft 213 connected in parallel to the mounting plate 211. The swing arm 22 is rotatably mounted on the outer circle of the mounting shaft 213. The return spring 24 is a telescopic spring which is arranged in a telescopic manner along the length direction, and two ends of the telescopic spring are respectively connected with the support plate 212 and the swing arm 22. When the swing arm 22 is not swung and is positioned right in front of the connecting seat 21, the stroke of the telescopic spring is shortest, so when the swing arm 22 deflects, the support self-return device 2 can automatically return to the initial support position by the tension of the telescopic spring. In this embodiment, the self-return device 2 is supported with a simple structure and a simple self-return principle, so as to effectively reduce the manufacturing difficulty and the manufacturing cost.
In the second embodiment of this alternative, as shown in fig. 7, the connection seat 21 includes a mounting plate 211 detachably fixed to the outer wall surface of the mounting arm 31, two support plates 212 disposed at opposite intervals and vertically connected to the mounting plate 211, and mounting shafts 213 with two ends respectively mounted on the two support plates 212. The swing arm 22 is rotatably mounted on the outer circle of the mounting shaft 213. The return spring 24 is a torsion spring, the torsion spring is mounted on the outer circle of the mounting shaft 213, and a first end of the torsion spring elastically abuts against the mounting plate 211 to limit, and a second end of the torsion spring opposite to the first end elastically abuts against the swing arm 22. When the swing arm 22 does not swing and is positioned right in front of the connecting seat 21, the torsion force of the torsion spring is minimum, so when the swing arm 22 deflects, the self-return device 2 can automatically return to the initial support position by the torsion force of the torsion spring. In this embodiment, the self-return device 2 is supported with a simple structure and a simple self-return principle, so as to effectively reduce the manufacturing difficulty and the manufacturing cost.
In this alternative, as shown in fig. 5 and 7, the swing arm 22 is in an "L" shape, and the end of the long shaft section with a longer length is rotatably mounted on the outer circle of the mounting shaft 213, and the top of the short shaft section with a smaller length than the long shaft section is provided with the rotating wheel 23. The two ends of the extension spring are connected to the support plate 212 and the long shaft section, respectively. The second end of the torsion spring resiliently abuts the long shaft section. The swing arm 22 is simple in construction and easy to manufacture.
Alternatively, as shown in fig. 5 and 6, the rotating wheel 23 includes a mounting post 231 fixed to the swing arm 22, a wheel body 232 rotatably installed at the top end of the mounting post 231, and a plurality of rollers 233 for rollingly supporting the upper chain 11. The rollers 233 are disposed on the roller body 232 at intervals, and each roller 233 is rotatably disposed to rollably support the upper chain 11. In the alternative, the rotating wheel 23 has a simple structure and is easy to prepare; the runner 232 is rotatably arranged at the top end of the mounting post 231, so that friction between the upper chain 11 and the runner 23 is reduced, and the drag chain 1 moves smoothly; similarly, the upper end surface of the self-return device 2 is provided with a roller 233, and the drag chain 1 and the self-return device 2 are in rolling friction during relative movement, so that friction force is reduced, and the drag chain 1 moves smoothly.
In this alternative, as shown in fig. 5 and 6, the rotating wheel body 232 includes a rotating wheel body having a hollow disc shape and an opening at an upper end, and a center column vertically supported at a center of the rotating wheel body. Both ends of each roller 233 are rotatably supported on the wheel body and the center post, respectively.
In this preferred embodiment, as shown in fig. 6, the plurality of rollers 233 are radially arranged along the radial direction of the runner body, so that the upper chain 11 can be uniformly supported in a rolling manner during the rotation of the runner 23, and the friction force between the rollers is reduced, so that the drag chain 1 can move smoothly.
In the preferred embodiment, as shown in fig. 6, the outer surface of the wheel body 232 is covered with an elastic wrapper to avoid damaging the drag chain 1; in a specific embodiment of the preferred embodiment, the foreskin is a rubber foreskin formed by rubber preparation.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A telescopic boom drag chain structure, comprising: a drag chain (1) and a plurality of groups of supporting self-return devices (2);
the drag chain (1) is annularly arranged on one side of the telescopic arm (3) along the telescopic direction of the telescopic arm (3) to form an upper chain (11) and a lower chain (12) which are oppositely arranged at intervals up and down;
the supporting self-return devices (2) are sequentially arranged at intervals along the towing direction of the towing chain (1), the mounting ends of the supporting self-return devices (2) are connected with the telescopic arms (3), the opposite supporting ends of the supporting self-return devices extend outwards and extend below the upper-layer chain (11) so as to support the upper-layer chain (11) in a rolling manner, the supporting self-return devices (2) are arranged in a deflection manner along the towing direction of the towing chain (1) so as to deflect towards the towing side of the towing chain (1) under the stress in the towing process of the towing chain (1) to avoid the towing chain (1), and the supporting self-return devices automatically return to the initial positions after the towing chain (1) is towed;
the telescopic arm (3) comprises a mounting arm (31) and an extension arm (32) which is sequentially nested and mounted in the mounting arm (31); the plurality of groups of the supporting self-return devices (2) are sequentially arranged at intervals along the length direction of the mounting arm (31), and the mounting end of each supporting self-return device (2) is fixed with the outer wall surface of the mounting arm (31);
the self-return supporting device (2) comprises a connecting seat (21) fixed with the mounting arm (31), a swinging arm (22) rotatably arranged on the connecting seat (21) to deflect towards the towing direction of the towing chain (1), a rotating wheel (23) for rolling and supporting the upper chain (11), and a return spring (24) for automatically returning the deflected swinging arm (22); the rotating wheel (23) is arranged on the swinging arm (22); the return spring (24) is connected between the connecting seat (21) and the swing arm (22).
2. The telescopic boom type drag chain structure according to claim 1, wherein,
the connecting seat (21) comprises a mounting plate (211) detachably fixed with the outer wall surface of the mounting arm (31), a support plate (212) vertically supported on the mounting plate (211) and a mounting shaft (213) connected to the mounting plate (211) in parallel;
the swing arm (22) is rotatably arranged on the outer circle of the mounting shaft (213);
the return spring (24) is a telescopic spring which is arranged in a telescopic manner along the length direction, and two ends of the telescopic spring are respectively connected with the support plate (212) and the swing arm (22).
3. The telescopic boom type drag chain structure according to claim 2, wherein,
the swing arm (22) is L-shaped, the end part of a long shaft section with a longer length is rotatably arranged on the outer circle of the mounting shaft (213), and the top end of a short shaft section with a length smaller than that of the long shaft section is provided with the rotating wheel (23);
and two ends of the telescopic spring are respectively connected with the support plate (212) and the long shaft section.
4. The telescopic boom type drag chain structure according to claim 1, wherein,
the connecting seat (21) comprises a mounting plate (211) detachably fixed with the outer wall surface of the mounting arm (31), two support plates (212) which are arranged at opposite intervals and are vertically connected with the mounting plate (211), and mounting shafts (213) with two ends respectively arranged on the two support plates (212);
the swing arm (22) is rotatably arranged on the outer circle of the mounting shaft (213);
the return spring (24) is a torsion spring, the torsion spring is arranged on the outer circle of the mounting shaft (213), the first end of the torsion spring elastically abuts against the mounting plate (211) to limit, and the second end opposite to the first end elastically abuts against the swing arm (22).
5. The telescopic boom type drag chain structure according to claim 4, wherein,
the swing arm (22) is L-shaped, the end part of a long shaft section with a longer length is rotatably arranged on the outer circle of the mounting shaft (213), and the top end of a short shaft section with a length smaller than that of the long shaft section is provided with the rotating wheel (23);
the second end of the torsion spring resiliently abuts the long shaft section.
6. The telescopic boom type drag chain structure according to claim 1, wherein,
the rotating wheel (23) comprises a mounting column (231) fixed with the swing arm (22), a rotating wheel body (232) rotatably arranged at the top end of the mounting column (231), and a plurality of rollers (233) for rolling and supporting the upper chain (11);
the rollers (233) are arranged on the rotating wheel body (232) at intervals, and the rollers (233) are rotatably arranged to rollingly support the upper chain (11).
7. The telescopic boom type drag chain structure according to claim 6, wherein,
the rotating wheel body (232) comprises a rotating wheel body which is hollow and disc-shaped and is provided with an opening at the upper end, and a center column vertically supported at the center of the rotating wheel body;
two ends of each roller (233) are respectively rotatably supported on the rotating wheel body and the center column.
8. The telescopic boom type drag chain structure according to claim 7, wherein,
the rollers (233) are radially arranged along the radial direction of the rotating wheel body.
9. The telescopic boom type drag chain structure according to claim 6, wherein,
the outer cover of the rotating wheel body (232) is covered with an elastic wrapper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210397438.2A CN114877023B (en) | 2022-04-15 | 2022-04-15 | Telescopic arm type drag chain structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210397438.2A CN114877023B (en) | 2022-04-15 | 2022-04-15 | Telescopic arm type drag chain structure |
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| CN114877023A CN114877023A (en) | 2022-08-09 |
| CN114877023B true CN114877023B (en) | 2023-05-02 |
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| CN109205470A (en) * | 2018-11-15 | 2019-01-15 | 徐工集团工程机械有限公司 | Working arm and engineering machinery |
| CN212717819U (en) * | 2020-06-30 | 2021-03-16 | 乐清市海宇智能科技有限公司 | Drag chain bearing structure |
| CN214036705U (en) * | 2020-11-13 | 2021-08-24 | 合肥欣奕华智能机器有限公司 | Drag chain operation supporting structure and drag chain device |
| CN112648340A (en) * | 2020-12-31 | 2021-04-13 | 徐州亚恒工程机械科技有限公司 | Telescopic high-altitude operation vehicle drag chain system |
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