CN212332976U - Helicopter fixed point constant speed feeding device - Google Patents
Helicopter fixed point constant speed feeding device Download PDFInfo
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- CN212332976U CN212332976U CN202022147974.6U CN202022147974U CN212332976U CN 212332976 U CN212332976 U CN 212332976U CN 202022147974 U CN202022147974 U CN 202022147974U CN 212332976 U CN212332976 U CN 212332976U
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Abstract
The utility model discloses a helicopter fixed point constant speed is put in and is put in device, including installing in the unwrapping wire reel in cabin, cable rope lowering belt and damping reduction gears, cable rope lowering belt one end is fixed on the unwrapping wire reel, and the other end is the free end, damping reduction gears installs on cable rope lowering belt to at the uniform velocity decline along cable rope lowering belt behind hoist and mount goods. The utility model discloses an adopt damping reduction gears to take the mode that the goods slowly fell together, realized that the fixed point constant speed of helicopter low latitude is put in, it is put in efficiently, and the spoilage of putting in back goods is low, and its low latitude that is suitable for multiple bad topography is put, has improved the security that the helicopter low latitude was put in.
Description
Technical Field
The utility model belongs to the technical field of the helicopter is thrown to the low latitude, concretely relates to device is put in to helicopter fixed point constant speed.
Background
The helicopter can take off and land vertically, can hover in the air, and can fly forwards and backwards, leftwards and rightwards and at low altitude, so the helicopter has high military and civil values. In the military field, the method can be used for military transportation, base supply, ammunition delivery and the like; in the civil field, the helicopter can be used for engineering construction, fire fighting and disaster relief, medical rescue, agriculture, forestry, animal husbandry, fishery, transportation and other aspects.
At present, cargo dropping of a helicopter is mainly carried out by hanging, conveying and landing dropping, the cargo is hung below the helicopter for transportation, the helicopter is controlled to vertically and slowly descend after reaching a target point, the cargo hung below the helicopter lands, and then the cargo is unloaded, the mode is only suitable for a flat ground, the helicopter is generally hung in a low altitude of 10-30 meters aiming at complicated terrains such as swamps, jungles, islands and the like, and then the cargo is directly dropped into the ground from a cabin, so that the loss of the cargo is large; and adopt traditional hanging to put in, need ground service personnel cooperation, through the one end with a series of hoist cable and fag end to pass through the couple and be connected with the helicopter belly, the other end passes through ground service personnel to be fixed on ground, then just can carry out the off-load, the efficiency of this kind of input mode is lower, and the helicopter need carry out long-time hovering, and the air in low latitude flows during, has very big influence to hovering of helicopter, has great potential safety hazard.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that just not enough to above-mentioned prior art provides a helicopter fixed point constant speed puts in device, and this puts in putting in device puts in efficiently, and the factor of safety of putting in is high, and the goods of putting in can slowly drop to ground at the uniform velocity, has effectively avoided the damage that goods and ground striking caused.
The utility model adopts the technical proposal that: the utility model provides a helicopter fixed point constant speed is put in and is put in device, is including installing in the unwrapping wire reel in the cabin, cable rope lowering belt and damping reduction gears, cable rope lowering belt one end is fixed on the unwrapping wire reel, and the other end is the free end, damping reduction gears installs on cable rope lowering belt to at the uniform velocity decline along cable rope lowering belt after hoist and mount goods.
Preferably, the rope lowering belt is a synchronous belt, the damping speed reducing mechanism comprises a synchronous wheel, a shell, a friction cavity and a locking mechanism which are correspondingly matched with the rope lowering belt, the rope lowering belt is meshed with the synchronous wheel and is locked and fixed through the locking mechanism after being meshed, a driving shaft penetrating through two ends of the synchronous wheel is installed at the axle center of the synchronous wheel, driving gears are symmetrically installed at two ends of the driving shaft, a driven gear is meshed on the driving gear, a driven shaft is installed on the driven gear, the driving gear and the driven gear are installed in the shell, the end parts of the driving shaft and the driven shaft are respectively fixed with the inner wall of the shell through shaft sleeves, one end of the driven shaft, far away from the driven gear, penetrates through the shell and extends into the friction cavity and is fixed with the inner wall of the friction cavity through the shaft sleeves, a friction ring is sleeved on the part of the driven shaft, a friction block is installed on the surface, the friction block is in contact friction with the friction layer, and the bottom of the shell is fixed with a hanging ring through a connecting piece.
Preferably, the locking mechanism comprises locking baffles, locking buckles, locking connecting rods, a pressing roller and a locking handle, the pressing roller is installed between the two locking baffles through a rolling shaft, locking holes are formed in the positions, opposite to the two locking baffles, of the two locking baffles, the locking connecting rods are further installed between the two locking baffles, the locking buckles are fixedly connected to the end portions of the locking connecting rods and located in the locking holes, the locking handle is installed at the end portions of hinged shafts of the locking connecting rods, locking grooves matched with the locking buckles are formed in the shell, and when the locking buckles are fixedly connected with the locking grooves, the pressing roller is pressed on the surface of the rope lowering belt.
Preferably, the friction ring adopts a centrifugal block and is arranged coaxially with the driven shaft.
Preferably, the helicopter fixed-point constant-speed throwing device further comprises a continuous throwing device, the continuous throwing device comprises a fixed support, the bottom of the fixed support is fixedly connected with the floor of the cabin, the top of the fixed support is positioned above the throwing port and is connected with a rotating drum in rotating fit with the fixed support, a plurality of uniformly distributed support arms are arranged on the outer wall of the rotating drum around the periphery of the rotating drum, and one end, far away from the fixed support, of each support arm is connected with a transmission roller in rotating fit with the support arm.
Preferably, the surface of the transmission roller is provided with a groove matched with the rope lowering belt, the rope lowering belt is embedded in the groove, and one end, far away from the pay-off reel, of the rope lowering belt is fixedly connected with a balancing weight.
Preferably, the helicopter fixed-point constant-speed launching device further comprises a slide way, the slide way is fixedly installed on the surface of the cabin floor, and the end part, located at the cabin launching port, of the slide way is an arc end matched with the launching port.
Preferably, the helicopter fixed point constant speed feeding device further comprises a cutting device, the cutting device comprises a connecting seat and a cutting knife, the connecting seat is fixed at a position close to the pay-off reel in the engine room, the surface of the connecting seat is fixedly connected with a motor, the cutting knife is fixed on a rotating shaft of the motor and located below the rope lowering belt, and when the motor works, the rotating shaft drives the cutting knife to rotate to cut off the rope lowering belt.
The beneficial effects of the utility model reside in that:
(1) by adopting the mode of slowly descending the damping speed reducing mechanisms along with the goods, the plurality of goods can be driven to slowly descend along the rope descending rope belts in sequence through the plurality of damping speed reducing mechanisms, the fixed-point continuous throwing is realized, and the throwing efficiency of the goods is greatly improved;
(2) the rope descending belt adopts a synchronous belt and is matched with the synchronous wheel, so that the slipping phenomenon can be effectively avoided, the stability of slow descending is ensured, and the synchronous belt can be repeatedly used for many times under the condition of ensuring the stability of slow descending;
(3) the gear transmission is adopted, the structure is compact, the transmission ratio is stable, the slow descending stability is further ensured, meanwhile, the gear transmission has long service life and is convenient to maintain and replace;
(4) the friction ring adopts the centrifugal block, the friction degree between the friction block on the friction ring and the inner wall of the friction cavity can be adjusted through the centrifugal force according to slowly descending goods with different weights, and the uniform speed and the stability of slow descending are further ensured;
(5) the locking mechanism is arranged, so that the synchronous belt and the synchronous wheel can be quickly assembled and disassembled, the falling-off between the rope lowering belt and the synchronous wheel can be effectively avoided, and the throwing efficiency is further improved when the quick assembly and disassembly are realized;
(6) the continuous throwing device is arranged, so that the transverse motion of the damping speed reducing mechanism is converted into the vertical motion in the motion process along the rope lowering belt, and the clamping stagnation of the damper at the throwing opening and the cabin floor is avoided;
(7) the self-unloading device is provided with the balancing weight, so that the hovering stability of the helicopter can be ensured through the balancing weight in the process of lowering the goods through a cable, and meanwhile, when the slowly-lowered goods reach the ground, the locking mechanism is jacked open through the balancing weight to finish the self-unloading of the goods;
(8) the slideway is arranged, so that the hoisted goods can be conveniently conveyed to the throwing port;
(9) the cutting device is arranged, so that the rope lowering belt can be cut off quickly when an emergency happens in the rope lowering process, the separation of the rope lowering goods and the helicopter is completed, and the safety of the helicopter under the emergency is effectively guaranteed.
The utility model discloses an adopt damping reduction gears to take the mode that the goods slowly fell together, realized that the fixed point constant speed of helicopter low latitude is put in, it is put in efficiently, and the spoilage of putting in back goods is low, and its low latitude that is suitable for multiple bad topography is put, has improved the security that the helicopter low latitude was put in.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the damping deceleration mechanism of the present invention;
fig. 3 is a schematic diagram of the separation of the pressing mechanism in the damping deceleration mechanism of the present invention.
In the figure: 1. paying off a winding drum; 2. a rope lowering belt; 3. a damping deceleration mechanism; 4. a continuous delivery device; 5. a slideway; 6. a cutting device; 301. a synchronizing wheel; 302. a housing; 303. a friction chamber; 304. a locking mechanism; 305. a drive shaft; 306. a driving gear; 307. a driven gear; 308. a driven shaft; 309. a friction ring; 310. a friction block; 311. a friction layer; 312. a connecting member; 313. a hoisting ring; 401. fixing a bracket; 402. a support arm; 403. a transmission roller; 404. a balancing weight; 601. a connecting seat; 602. a motor; 603. a cutting knife; 3041. locking the baffle; 3042. a locking buckle; 3043. locking the connecting rod; 3044. pressing the roller; 3045. locking the handle; 3046. and (4) locking the groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Examples
As shown in fig. 1, 2 and 3, the helicopter fixed-point constant-speed launching device provided by this embodiment includes a pay-off reel 1 installed in a nacelle, a continuous launching device 4, a slideway 5, a cutting device 6, a rope lowering belt 2 and a damping deceleration mechanism 3, wherein the pay-off reel 1 is fixed on the surface of a floor in the nacelle through an installation frame, the rope lowering belt 2 is a synchronous belt, and one end of the rope lowering belt is fixed with the pay-off reel 1 and then wound on the pay-off reel 1;
the damping speed reducing mechanism 3 comprises a synchronizing wheel 301 correspondingly matched with the rope lowering rope belt 2, a driving shaft 305 which penetrates through two ends of the synchronizing wheel 301 and is coaxially arranged is installed at the axis of the synchronizing wheel 301, driving gears 306 are symmetrically sleeved at two ends of the driving shaft 305, a driven gear 307 is meshed on the driving gear 306, the driving gear 306 is meshed with the driven gear 307 and then is positioned in the shell 302, the end part of the driving shaft 305 and the end part of the driven shaft 308 are fixed with the inner wall of the shell 302 through shaft sleeves, the shaft sleeves are also installed between the shell 302 and the synchronizing wheel 301 and sleeved on the outer wall of the driving shaft 305 and play a role in connecting the synchronizing wheel 301 with the shell 302, but the normal rotation of the synchronizing; the driven gear 307 is connected with a driven shaft 308, one end of the driven shaft 308, far away from the driven gear 307, penetrates through the shell 302 and extends into the friction cavity 303, the outer wall of the friction cavity 303 is tightly attached to the outer wall of the shell 302 and is fixed through screws, the position, where the driven shaft 308 penetrates through the shell 302 and the friction cavity 303, of the driven shaft is fixed with the shell 302 and the friction cavity 303 through bearings, one end, located in the friction cavity 303, of the driven shaft 308 is fixed with the inner wall of the friction cavity 303 through a shaft sleeve, a friction ring 309 is sleeved on the part, located in the friction cavity 303, of the driven shaft 308, an annular centrifugal block is adopted in the friction ring 309, a friction block 310 is installed on the outer wall of the centrifugal block, the friction cavity 303 is an inverted hollow cylindrical cavity, and a friction layer 311 is; a hanging ring 313 is fixed at the bottom of the shell 302 through a connecting piece 312, and the hanging ring 313 is used for hoisting goods for slow descent;
the synchronizing wheel 301 of the damping deceleration mechanism 3 is arranged behind the rope-lowering belt 2, and after the synchronizing wheel 301 is meshed with the rope-lowering belt 2, the rope-lowering belt 2 is locked on the synchronizing wheel 301 through the locking mechanism 304, the locking mechanism 304 comprises locking baffles 3041, locking buckles 3042, locking connecting rods 3043, pressing rollers 3044, locking handles 3045 and locking grooves 3046 which are arranged on the shell 302 and are matched with the locking buckles 3042, the two pressing rollers 3044 are symmetrically arranged up and down, one pressing roller 3044 is arranged at the upper part between the two locking baffles 3041, the other pressing roller is arranged at the lower part between the two locking baffles 3041, a rolling shaft is arranged at the axle center of the pressing roller 3044, two ends of the rolling shaft are fixed with the inner wall of the locking baffle 3041 through fixed bearings, so that the pressing roller 3044 can rotate by the rolling shaft, a locking hole 3046 matched with the locking groove 3041 is arranged in the middle part of the locking baffle 3041, and the locking connecting rod 3 is fixedly arranged near the locking, the locking connecting rod 3043 in this embodiment adopts a triangular connecting rod mechanism, that is, one end of two identical connecting rods is hinged, and the other end is respectively fixed with a locking buckle 3042, the hinged position of the locking connecting rod 3043 is fixedly connected with a locking handle 3045, and the locking handle 3045 is used for controlling the action of the locking connecting rod 3043; when the locking handle 3045 is pulled down, the two connecting rods of the locking connecting rod 3043 are opened and extended, so that the locking buckle 3042 at the end of the connecting rod is extended into the locking groove 3046 for locking, at the moment, the two connecting rods and the hinge point are collinear to provide the maximum locking force, and after locking, the pressing roller 3044 is pressed on the smooth surface of the synchronous belt; when the locking handle 3045 is pushed up, the two connecting rods of the locking connecting rod 3043 retract, the locking buckle 3042 at the end of the connecting rod is taken out from the locking groove 3046, and after the locking buckle 3042 is taken out, the pressing mechanism is loosened and does not press the rope lowering belt 2, so that the synchronizing wheel 301 is separated from the rope lowering belt 2, and the unloading is completed;
the slideway 5 is arranged on the surface of the cabin floor and is positioned below the rope lowering belt 2, and the end part of the slideway 5 positioned at the throwing opening is in an arc shape matched with the throwing opening;
the continuous throwing device 4 comprises a fixed support 401, the bottom of the fixed support 401 is fixedly connected with the floor of the cabin, the top of the fixed support 401 is positioned above the throwing opening and is connected with a rotating drum which is in rotating fit with the fixed support 401, a plurality of evenly distributed support arms 402 are arranged on the outer wall of the rotating drum around the circumference, one end of each support arm 402 far away from the fixed support 401 is connected with a transmission roller 403 which is in rotating fit with the support arm, a groove which is matched with the rope lowering belt 2 is formed in the surface of the transmission roller 403, the rope lowering belt 2 is embedded in the groove, a balancing weight 404 is fixedly connected with one end of the rope lowering belt 2 far away from the paying-off drum 1, the balancing weight 404 is arranged at the center of the rope lowering belt 2, preferably, a top block is arranged on the top surface of the seed distributing block, after the damping speed reducing mechanism 3 and the rope lowering belt 2 are assembled, a locking mechanism 304 of the damping speed reducing mechanism is positioned on, the top block on the top surface of the counterweight block 404 corresponds to the position of the locking handle 3045 of the pressing mechanism, and the gravity of the downward sliding of the damping deceleration mechanism 3 makes the top block of the counterweight block 404 collide with the locking handle 3045, so that the locking handle 3045 is lifted upwards, the locking buckle 3042 is separated from the locking groove 3046, and the self-unloading of the falling goods is completed;
the cutting device 6 comprises a connecting seat 601 and a cutting knife 603, the connecting seat 601 is fixed in the cabin close to the pay-off reel 1, the surface of the connecting seat 601 is fixedly connected with a motor 602, the cutting knife 603 is fixed on a rotating shaft of the motor 602, the cutting knife 603 is located below the rope lowering belt 2, and when the motor 602 works, the rotating shaft drives the cutting knife 603 to rotate to cut off the rope lowering belt 2.
When the utility model is used, the helicopter is hovered above the throwing position, one end of the rope-lowering belt 2 provided with the balancing weight 404 is pulled out to the continuous throwing device 4, then the smooth surface of the rope-lowering belt 2 is embedded in the groove of the transmission roller of the continuous throwing device 4, then the paying-off is carried out, the rope-lowering belt 2 is lowered to the position 1-2 meters away from the ground along the throwing opening, and the paying-off work is completed; then, a plurality of damping deceleration mechanisms 3 are locked and fixed on the rope lowering belt 2 through a locking mechanism 304, after locking and fixing, the damping deceleration mechanisms 3 are positioned on the surface of the rope lowering belt 2, a pressing mechanism is positioned on the bottom surface of the rope lowering belt 2, then, goods are hung below the damping deceleration mechanisms 3 through a hanging ring 313 and are placed on a slideway 5, the goods are conveyed to a throwing opening along the slideway 5, at the moment, the damping deceleration mechanisms 3 and the locking mechanism 304 move to a transmission roller 403, in the process that the goods continue to move forwards, the transmission roller 403 is pushed, the transmission roller 403 and the support arm 402 rotate on a fixed support 401 together, so that the transverse motion of the damping deceleration mechanisms 3 is converted into vertical motion, the damping deceleration mechanisms 3 continue to slowly descend along the rope lowering belt 2 in the vertical direction, and other support arms 402 and rollers on the continuous throwing device 4 continuously rotate, thereby can realize in proper order incessant the vertical motion that turns into with the lateral motion of a plurality of damping reduction gears 3, accomplish the continuous input of goods, the goods that slowly descend on rope falling area 2 is hindered damping deceleration effect of damping reduction gears 3, thereby realize at the uniform velocity slowly descending, when descending to balancing weight 404 department, the kicking block that corresponds with locking mechanism 304's locking handle 3045 on the balancing weight 404, upwards jack-up locking handle 3045, accomplish locking mechanism 304 and damping reduction gears 3's separation, thereby make synchronizing wheel 301 and rope falling area 2 break away from, the goods drops on ground, accomplish the uninstallation of goods.
Claims (8)
1. The utility model provides a device is put in to helicopter fixed point constant speed which characterized in that: the rope lowering device is characterized by comprising a paying-off winding drum (1), a rope lowering belt (2) and a damping speed reducing mechanism (3), wherein the paying-off winding drum, the rope lowering belt (2) and the damping speed reducing mechanism are arranged in a cabin, one end of the rope lowering belt (2) is fixed on the paying-off winding drum (1), the other end of the rope lowering belt is a free end, and the damping speed reducing mechanism (3) is arranged on the rope lowering belt (2) and descends at a constant speed along the rope lowering belt (2) after goods.
2. A helicopter fixed point constant speed launching device according to claim 1, characterized in that: the rope falling belt (2) is a synchronous belt, the damping speed reducing mechanism (3) comprises a synchronous wheel (301) correspondingly matched with the rope falling belt (2), a shell (302), a friction cavity (303) and a locking mechanism (304), the rope falling belt (2) is meshed with the synchronous wheel (301) and is locked and fixed through the locking mechanism (304) after being meshed, a driving shaft (305) penetrating through two ends of the synchronous wheel (301) is installed at the axis of the synchronous wheel (301), driving gears (306) are symmetrically installed at two ends of the driving shaft (305), a driven gear (307) is meshed on the driving gear (306), a driven shaft (308) is installed on the driven gear (307), the driving gear (306) and the driven gear (307) are installed in the shell (302), the end parts of the driving shaft (305) and the driven shaft (308) are fixed with the inner wall of the shell (302) through shaft sleeves respectively, one end, far away from the driven gear (307), of the driven shaft (308) penetrates through the shell (302) and extends into, and fixed through axle sleeve and friction chamber (303) inner wall, the cover is equipped with friction ring (309) on the part that driven shaft (308) are located friction chamber (303), and friction ring (309) surface mounting has friction block (310), the inner wall surface that friction chamber (303) and friction block (310) correspond covers frictional layer (311), friction block (310) and frictional layer (311) contact friction, casing (302) bottom is fixed with rings (313) through connecting piece (312).
3. A helicopter fixed point constant speed launching device according to claim 2, characterized in that: the locking mechanism (304) comprises locking baffles (3041), locking buckles (3042), locking connecting rods (3043), pressing rollers (3044) and locking handles (3045), wherein the pressing rollers (3044) are installed between the two locking baffles (3041) through rolling shafts, locking holes are formed in the positions, opposite to the two locking baffles (3041), of the two locking baffles (3043) are further installed between the two locking baffles (3041), the ends of the locking connecting rods (3043) are fixedly connected with the locking buckles (3042), the locking buckles (3042) are located in the locking holes, the locking handles (3045) are installed at the ends of hinged shafts of the locking connecting rods (3043), locking grooves (3046) matched with the locking buckles (3042) are formed in the shell (302), and when the locking buckles (3042) are fixedly connected with the locking grooves (3046), the pressing rollers (3044) are pressed on the surface of the rope lowering belt (2).
4. A helicopter fixed point constant speed launching device according to claim 3, characterized in that: the friction ring (309) adopts a centrifugal block and is coaxially arranged with the driven shaft (308).
5. A helicopter fixed point constant speed launching device according to claim 4, characterized in that: still put in device (4) in succession, put in device (4) in succession includes fixed bolster (401), fixed bolster (401) bottom and cabin floor fixed connection, and fixed bolster (401) top is located puts in mouthful top to be connected with fixed bolster (401) normal running fit's rotary drum, the rotary drum outer wall is equipped with several evenly distributed's support arm (402) around its week, the one end that fixed bolster (401) was kept away from in support arm (402) is connected with rather than normal running fit's drive roller (403).
6. A helicopter fixed point constant speed launching device according to claim 5, characterized in that: the surface of the transmission roller (403) is provided with a groove matched with the rope lowering belt (2), the rope lowering belt (2) is embedded in the groove, and one end, far away from the paying-off reel (1), of the rope lowering belt (2) is fixedly connected with a balancing weight (404).
7. A helicopter fixed point constant speed launching device according to claim 4, characterized in that: the device is characterized by further comprising a slide way (5), wherein the slide way (5) is fixedly arranged on the surface of the floor of the cabin, and the end part, located at the cabin putting opening, of the slide way (5) is an arc end matched with the putting opening.
8. A helicopter fixed point constant speed launching device according to claim 4, characterized in that: still include cutting device (6), cutting device (6) are including connecting seat (601) and cutting off cutter (603), and connecting seat (601) are fixed and are close to unwrapping wire reel (1) department in the cabin, and connecting seat (601) fixed surface is connected with motor (602), is fixed with cutting off cutter (603) in the pivot of motor (602), and cutting off cutter (603) are located rope falling belt (2) below, and when motor (602) during operation, the pivot drives cutting off cutter (603) and rotates rope falling belt (2) and cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022147974.6U CN212332976U (en) | 2020-09-25 | 2020-09-25 | Helicopter fixed point constant speed feeding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022147974.6U CN212332976U (en) | 2020-09-25 | 2020-09-25 | Helicopter fixed point constant speed feeding device |
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| Publication Number | Publication Date |
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| CN212332976U true CN212332976U (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022147974.6U Active CN212332976U (en) | 2020-09-25 | 2020-09-25 | Helicopter fixed point constant speed feeding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117734943A (en) * | 2024-02-20 | 2024-03-22 | 山西成功通用航空股份有限公司 | Aviation rescue rope descending device |
-
2020
- 2020-09-25 CN CN202022147974.6U patent/CN212332976U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117734943A (en) * | 2024-02-20 | 2024-03-22 | 山西成功通用航空股份有限公司 | Aviation rescue rope descending device |
| CN117734943B (en) * | 2024-02-20 | 2024-04-26 | 山西成功通用航空股份有限公司 | Aviation rescue rope descending device |
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