CN115806052A - Parachute equipment for automatically starting backup parachute in case of failure of main parachute and opening method - Google Patents
Parachute equipment for automatically starting backup parachute in case of failure of main parachute and opening method Download PDFInfo
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- CN115806052A CN115806052A CN202211708636.2A CN202211708636A CN115806052A CN 115806052 A CN115806052 A CN 115806052A CN 202211708636 A CN202211708636 A CN 202211708636A CN 115806052 A CN115806052 A CN 115806052A
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Abstract
The invention belongs to the field of aviation lifesaving, and particularly relates to parachute equipment for automatically starting a backup parachute when a main parachute fails and an opening method. The parachute system for automatically opening the backup parachute in case of failure mainly comprises a main parachute, the backup parachute, a load and an electronic starting device. The invention adopts the main umbrella as the main speed reducer of the umbrella-mounted system, adopts the backup umbrella as the emergency speed reducer of the umbrella-mounted system, and adopts the electronic starting device as the starting device for judging the abnormal working state of the main umbrella and opening the backup umbrella. Compared with the existing mechanical starting device, the invention cancels the system cross-linking between the starting device and the main umbrella, improves the draping efficiency before the task, and has the advantages of small volume, light weight, high integration level and the like.
Description
Technical Field
The invention belongs to the field of aviation emergency rescue, and particularly relates to parachute equipment for automatically starting a backup parachute when a main parachute breaks down and an opening method.
Background
The present parachute system mainly comprises a main parachute and a backup parachute. The backup umbrella does not need to be opened after the main umbrella is opened, and the backup umbrella needs to be opened when the main umbrella cannot be opened.
The mode of opening the backup umbrella mainly has 2 kinds, the first kind is that the parachutist opens the umbrella by hand, the second kind is to use mechanical starting device.
At present, the spare umbrella is opened mainly by using a pull ring of a handle, namely when a parachutist parachutes, when a main umbrella system fails and can not open the spare umbrella, the parachutist needs to pull open the spare umbrella manually. However, under certain circumstances, the parachutists are in a non-waking state due to the influence of physiological and psychological factors, and the like, and cannot manually open the backup parachute, so that casualty accidents are caused.
The mechanical starting device adopts the working principle that the working state of a mechanical gear mechanism in a product is controlled by plugging and unplugging double bolts. When the umbrella-mounted system leaves the airplane, the No. 1 bolt is pulled out, and the mechanical starting device starts to work to control the backup umbrella to be opened at a preset time; meanwhile, the mechanical starting device senses the working signal of the main umbrella through a 2 nd bolt connected with the main umbrella, if the main umbrella is normally opened, the 2 nd bolt is pulled out by the impact force when the exhaust hole of the main umbrella is opened, the mechanical starting device stops working, and the backup umbrella is not opened; if the main umbrella is not opened or the main umbrella is not normally opened, the exhaust hole of the main umbrella cannot be opened, the No. 2 bolt is not pulled out, and the mechanical starting device works to open the backup umbrella. The mechanical starting device is started after the parachute-mounted system leaves the aircraft, if the main parachute is opened normally and then fails, the backup parachute cannot be opened, and the lifesaving can fail. Meanwhile, the mechanical starting device is only suitable for the backup umbrella of the hard package and is not suitable for the backup umbrella of the soft package.
Disclosure of Invention
The purpose of the invention is as follows: a parachute device and an opening method for automatically starting a backup parachute when a main parachute fails are designed, when the main parachute fails, cannot be normally opened or fails after being normally opened, the backup parachute can be automatically opened in time, and safe landing of a parachute-mounted system is guaranteed.
Technical scheme
A parachute equipment for automatically starting a backup parachute when a main parachute fails comprises a main parachute 1, a backup parachute 2 and a load 3, and is characterized in that the main parachute 1 and the backup parachute 2 are installed on the load 3; the backup umbrella 2 also comprises an electronic starting device 4; the electronic starting device 4 is provided with an exploder 5 and a starting pin 6, and one end of the starting pin 6 is connected to the electronic starting device 4.
The electronic starting device 4 is provided with a jack 7, and the starting pin 6 is inserted into the jack 7 in a standby state; a switch 8 is arranged in the jack 7, the electronic starting device 4 is in a low power consumption state when the starting pin 6 is inserted into the switch 8, and the electronic starting device 4 is in a working state when the starting pin 6 is pulled out.
Preferably, the other end of the actuating pin 6 is connected to the aircraft.
Preferably, the actuating pin 6 is a flexible latch.
Preferably, the actuating pin 6 is secured against loosening.
Preferably, the switch 8 is a normally open switch.
The electronic starting device 4 comprises a power supply module 9, a temperature and pressure sensor 10, a host MCU11 and an ignition module 12; the power module 9 is used for supplying power to the electronic starting device 4; the temperature and pressure sensor 10 is used for measuring the atmospheric static pressure P and the atmospheric static temperature T of the area where the umbrella-mounted system is located and transmitting the measured atmospheric static pressure P and atmospheric static temperature T to the host MCU11; the host MCU11 is used for resolving the atmospheric static pressure P and the atmospheric static temperature T which are measured and transmitted by the temperature and pressure sensor 10 and outputting an ignition signal after meeting the set backup umbrella emergency parachute opening control logic; the ignition module 12 ignites the exploder 5 after receiving the ignition signal output by the host MCU11 and after adjusting.
The host MCU11 firstly resolves the atmospheric static pressure P and the atmospheric static temperature T which are measured and transmitted by the temperature and pressure sensor 10 into a height value H (formula 1-1) of the area where the umbrella-mounted system is located, and then resolves the height difference in unit time into a real-time vertical descending speed V (formula 1-2) of the umbrella-mounted system through the height value H.
And calculating the air pressure height H according to the relationship between the air pressure height H and the atmospheric static pressure P and the atmospheric static temperature T. Ignoring the change of the gravity acceleration g, the relationship between the height H and the atmospheric static pressure P and the atmospheric static temperature T is as follows:
in the formula: p 0 =101.324kPa, atmospheric pressure at standard sea level (barometric altitude of 0);
R＝287.052 78m 2 /(K·s 2 ) Is the air gas constant;
g 0 ＝9.806 65m/s 2 the acceleration is the gravity acceleration of the standard sea level;
β =0.006 5K/m, which is the vertical rate of change of temperature;
T 0 =273.16K, the temperature at standard sea level.
The descending speed is calculated according to the height variation in unit time, namely the descending speed calculation formula is as follows:
when the other end of the starting pin 6 is connected to the airplane, the starting pin 6 is pulled out when the umbrella-mounted system leaves the airplane; when the other end of the starting pin 6 is hung on the load 3, a worker pulls out the starting pin 6 as required, and when the starting pin 6 is separated from the electronic starting device 4, the electronic starting device 4 is triggered to start working.
The emergency parachute-opening control logic of the backup parachute 2 is that when the parachute-mounted system leaves the aircraft for a certain time T 0 Or down to a certain safety height H 0 Then, whether the vertical descending speed of the umbrella-mounted system is greater than the safe speed V or not is judged 0 If at the same time T ≧ T 0 Or H is less than or equal to H 0 、V≤V 0 The main umbrella 1 is considered to be normally opened and not meet the emergency opening condition of the backup umbrella 2 (the backup umbrella 2 does not need to be opened); otherwise, T is more than or equal to T 0 Or H is less than or equal to H 0 、V＞V 0 The main umbrella 1 is not normally opened and the backup umbrella 2 needs to be opened.
Preferably, the backup parachute 2 opens the parachute accuseMaking the logical element a safety height H 0 Safe speed V 0 。
A parachute equipment and an opening method for automatically starting a backup parachute when a main parachute breaks down comprise the following specific processes:
step 1: before the umbrella-carried system is on board (or off board), the logical element (safe height H) for controlling the opening of the backup umbrella 2 is set according to the task section of the parachute landing 0 Safe speed V 0 ) The specific parameters of (a).
Step 2: after boarding (or before leaving) the umbrella-mounted system, the other end of the actuating pin 6 is connected to the airplane.
And 3, step 3: when the umbrella-mounted system leaves the plane, the starting pin 6 hung on the plane is pulled out, the starting pin 6 is separated from the electronic starting device 4, and the electronic starting device 4 is triggered to start working.
And 4, step 4: after the umbrella-mounted system leaves the aircraft, the main umbrella 1 adopts a primary umbrella opening mode and is inflated to open.
And 5: the temperature and pressure sensor 10 measures the atmospheric static pressure P and the atmospheric static temperature T of the area where the umbrella-mounted system is located, the measured atmospheric static pressure P and the measured atmospheric static temperature T are transmitted to the host MCU11, the host MCU11 firstly resolves the atmospheric static pressure P into a height value H of the area where the umbrella-mounted system is located, and then resolves the height difference in unit time into a real-time vertical descending speed V of the umbrella-mounted system through the height value H.
And 6: in the descending process of the umbrella-mounted system, if the result is calculated according to the MCU11 of the host, the umbrella-mounted system is descended to a certain safety height H after leaving the airplane 0 Then, whether the vertical descending speed of the umbrella-mounted system is greater than the safe speed V or not is judged 0 Such that H ≦ H is satisfied simultaneously 0 、V≤V 0 The main umbrella 1 is considered to be normally opened and not meet the emergency opening condition of the backup umbrella 2 (the backup umbrella 2 does not need to be opened); otherwise, H is less than or equal to H 0 、V＞V 0 The main umbrella 1 is not normally opened and the backup umbrella 2 needs to be opened.
And 7: the main umbrella 1 or the backup umbrella 2 is dropped with the load 3.
Preferably, the logical element of the parachute opening control of the backup parachute 2 is a safety height H 0 Safe speed V 0 。
Technical effects
1) The parachute system can reasonably set working parameters according to actual combat training task requirements, the parachute opening time of the backup parachute can be accurately controlled, and a special failure mode that a main parachute is accidentally failed after being normally opened can be intelligently judged and processed;
2) The parachute system is of an electromechanical structure, is electronically controlled and mechanically executed, has high control precision and high reliability, and can meet the requirements of battle training tasks in the whole territory;
3) The parachute system has simple system cross-linking, no direct connection with the main parachute and high use and maintenance performance.
4) Compared with the existing hand-pulling parachute opening mode, the parachute system has the advantages of simple operation procedure, short training time of parachutists, high safety, no influence of psychophysiological factors of the parachutists and the like.
5) The electronic starting device 4 and the related working logic in the parachute system can be applied to the civil field such as emergency lifesaving in distress of automobiles and ships.
Drawings
FIG. 1 is a schematic view of a parachute system;
FIG. 2 is a schematic diagram of the standby state of the electronic starting device before the parachute-mounted system leaves the aircraft (the starting pin 6 is not pulled out);
FIG. 3 is a schematic view of the electronic starting device in an operating state after the parachute-mounted system is taken off the airplane (the starting pin 6 is pulled out);
the system comprises a main umbrella 1, a backup umbrella 2, a load 3, an electronic starting device 4, an explosion burner 5, a starting pin 6, a jack 7, a switch 8, a power module 9, a temperature and pressure sensor 10, a host MCU11 and an ignition module 12.
Detailed Description
The present invention will be further described with reference to the following examples. The following description is only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Airborne aerial delivery is an important means for rapidly delivering personnel and materials to a destination, and the rapid delivery capability of a country is reflected. This parachute system can be according to actual combat training task demand, and reasonable setting working parameter, but backup parachute opportunity accurate control can intelligent judgement and handle the special fault mode that main parachute normally opened earlier the back accident became invalid, and furthest's improvement parachute jumping personnel be exactly the success rate when main parachute trouble.
As shown in fig. 1 and 2, a parachute system for automatically opening a backup parachute when a main parachute fails includes a main parachute 1, a backup parachute 2, and a load 3. The parachute system is not directly related to the main parachute, is simple in system cross-linking and can be applied to personnel airborne and material airdrop scenes.
The electronic starting device 4 is a core control part of the parachute system, is a main parachute state monitoring device, a backup parachute opening condition judging device and a starting device, and is provided with an explosion burner 5 and a starting pin 6, and one end of the starting pin 6 is connected to the electronic starting device 4. The electronic starting device 4 is provided with a jack 7, and a switch 8 is arranged in the jack 7; in a standby state, the starting pin 6 is inserted into the jack 7 and pushes the switch 8 open, and the electronic starting device 4 is in a low power consumption state.
The electronic starting device 4 is provided with a power module 9, a temperature and pressure sensor 10, a host MCU11 and an ignition module 12; the power module 9 is used for supplying power to the electronic starting device 4; the temperature and pressure sensor 10 is used for measuring the atmospheric static pressure P and the atmospheric static temperature T of the area where the umbrella-mounted system is located, and transmitting the measured atmospheric static pressure P and atmospheric static temperature T to the host MCU11; the MCU11 is used for resolving the atmospheric static pressure P measured and transmitted by the temperature and pressure sensor 10 and outputting an ignition signal after meeting the set backup umbrella emergency parachute opening control logic; the ignition module 12 ignites the exploder 5 after receiving the ignition signal output by the host MCU11 and adjusting the ignition signal.
Embodiment 1, when the application scenario of the invention is airborne airdrop training,
step 1: before the parachute-mounted system boards the airplane, specific parameters of parachute-opening control logic elements (safe height H0 and safe speed V0) of the backup parachute 2 are set according to the parachute drop mission profile.
And 2, step: after the umbrella system is on board the aircraft, the other end of the actuating pin 6 is connected to the aircraft.
And step 3: when the umbrella-mounted system leaves the airplane, the starting pin 6 hung on the airplane is pulled out, the starting pin 6 is separated from the electronic starting device 4, and the electronic starting device 4 is triggered to start working.
And 4, step 4: after the umbrella-mounted system leaves the aircraft, the main umbrella 1 adopts a primary umbrella opening mode and is inflated to open.
And 5: the temperature and pressure sensor 10 measures the atmospheric static pressure P and the atmospheric static temperature T of the area where the umbrella-mounted system is located, the measured atmospheric static pressure P and the measured atmospheric static temperature T are transmitted to the host MCU11, the host MCU11 firstly resolves the atmospheric static pressure P into the height value H of the area where the umbrella-mounted system is located, and then resolves the height difference within unit time into the real-time vertical descending speed V of the umbrella-mounted system through the height value H.
And 6: in the descending process of the umbrella-mounted system, if the calculation result is calculated according to the MCU11 of the host computer, the umbrella-mounted system is off-line and descends to a certain safety height H 0 Then, whether the vertical descending speed of the parachute-carrying system is larger than the safe speed V or not is judged 0 Such that H ≦ H is satisfied simultaneously 0 、V≤V 0 The main umbrella 1 is considered to be normally opened and not meet the emergency opening condition of the backup umbrella 2 (the backup umbrella 2 does not need to be opened); otherwise H is less than or equal to H 0 、V＞V 0 The main umbrella 1 is not normally opened and the backup umbrella 2 needs to be opened.
And 7: the main umbrella 1 or the backup umbrella 2 is dropped with the load 3.
Example 2, when the application scene of the invention is to deal with emergency in wartime,
step 1: before the parachute-mounted system leaves the aircraft, setting the parachute-opening control logic element (departure time T) of the backup parachute 2 according to the parachute-descending task profile 0 Safe speed V 0 ) The specific parameters of (a).
Step 2: before the parachute-carrying system leaves the aircraft, the other end of the actuating pin 6 is connected to the hook on the load 3.
And step 3: when the umbrella-mounted system leaves the airplane, a worker pulls the starting pin 6 off, the starting pin 6 is separated from the electronic starting device 4, and the electronic starting device 4 is triggered to start working.
And 4, step 4: after the umbrella-mounted system leaves the aircraft, the main umbrella 1 adopts a primary umbrella opening mode and is inflated to open.
And 5: the temperature and pressure sensor 10 measures the atmospheric static pressure P and the atmospheric static temperature T of the area where the umbrella-mounted system is located, the measured atmospheric static pressure P and the measured atmospheric static temperature T are transmitted to the host MCU11, the host MCU11 firstly resolves the atmospheric static pressure P and the atmospheric static temperature T into the height value H of the area where the umbrella-mounted system is located, and then resolves the height difference in unit time into the real-time vertical descending speed V of the umbrella-mounted system through the height value H.
And 6: in the descending process of the umbrella-mounted system, if the result is calculated according to the MCU11 of the host, the umbrella-mounted system leaves the aircraft for a certain time T 0 Then, whether the vertical descending speed of the umbrella-mounted system is greater than the safe speed V or not is judged 0 Satisfy T ≧ T at the same time 0 、V≤V 0 The main umbrella 1 is considered to be normally opened and not meet the emergency opening condition of the backup umbrella 2 (the backup umbrella 2 does not need to be opened); otherwise T is more than or equal to T 0 、V＞V 0 The main umbrella 1 is not normally opened and the backup umbrella 2 needs to be opened.
And 7: the main umbrella 1 or the backup umbrella 2 is dropped with the load 3.
In summary, the present invention adopts the main parachute as the main decelerator of the parachute-mounted system, adopts the backup parachute as the emergency decelerator of the parachute-mounted system, and adopts the electronic starter as the starter for judging the abnormal working state of the main parachute and for starting the opening of the backup parachute. Compared with the existing mechanical starting device, the invention cancels the system cross-linking between the starting device and the main umbrella, improves the draping efficiency before the task, and has the advantages of small volume, light weight, high integration level, good environmental adaptability, small separation error, high reliability, repeated use, good use and maintenance, low cost and the like.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, improvements and the like 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 parachute equipment capable of automatically starting a backup parachute in case of failure of a main parachute is characterized by comprising a main parachute (1), a backup parachute (2) and a load (3), wherein the main parachute (1) and the backup parachute (2) are installed on the load (3); the backup umbrella (2) also comprises an electronic starting device (4); the electronic starting device (4) is provided with an exploder (5) and a starting pin (6), and one end of the starting pin (6) is connected to the electronic starting device (4).
2. Parachute kit for the automatic activation of a backup parachute in case of a failure of a main parachute according to claim 1, characterized in that the electronic activation device (4) is provided with a jack (7), and the activation pin (6) is inserted into the jack (7) in the standby state; a switch (8) is arranged in the jack (7), the switch (8) is in an off state when the starting pin (6) is inserted into the jack (7), and the switch (8) is in an on state when the starting pin (6) is pulled out.
3. Parachute kit for the automatic activation of a backup parachute in case of failure of a main parachute according to claim 1, characterized in that the other end of the activation pin (6) is connected to the aircraft or is hung from the load (3).
4. Parachute kit for the automatic activation of backup parachutes in case of failure of a main parachute according to claim 1, characterized in that the activation pin (6) is a flexible or rigid latch.
5. Parachute kit for the automatic activation of a backup parachute in case of failure of a main parachute according to claim 1, characterized in that the electronic activation device (4) comprises a power module (9), a temperature and pressure sensor (10), a host MCU (11) and an ignition module (12); the power supply module (9) is used for supplying power to the electronic starting device (4); the temperature and pressure sensor (10) is used for measuring the atmospheric static pressure P of the area where the umbrella-mounted system is located and transmitting the measured atmospheric static pressure value Q to the host MCU (11); the host MCU (11) is used for resolving atmospheric static pressure P and atmospheric static temperature T which are measured and transmitted by the temperature and pressure sensor (10) and outputting an ignition signal after meeting the set backup umbrella emergency parachute opening control logic; and the ignition module (12) ignites the exploder (5) after adjusting the ignition signal output by the host MCU (11).
6. The parachute equipment capable of automatically starting the backup parachute in case of failure of the main parachute according to claim 5, wherein the atmospheric static pressure P and the atmospheric static temperature T measured and transmitted by the temperature and pressure sensor (10) of the host MCU (11) are firstly resolved into a height value H of an area where the parachute-mounted system is located, and then the height difference within a unit time is resolved into a real-time vertical descent speed V of the parachute-mounted system through the height value H; calculating the air pressure height H according to the relationship between the air pressure height H and the atmospheric static pressure P and the atmospheric static temperature T; neglecting the change of the gravity acceleration g, the relationship between the height H and the atmospheric static pressure P and the atmospheric static temperature T is as follows:
in the formula: p0=101.324kPa, atmospheric pressure at standard sea level; the height of the air pressure is 0,
r =287.052 78m2/(K · s 2), air gas constant;
g0=9.806 65m/s2, which is the gravitational acceleration at standard sea level;
β =0.006 5K/m, which is the vertical rate of change of temperature;
t0=273.16K, the temperature at standard sea level;
the descending speed is calculated according to the height variation in unit time, namely the descending speed calculation formula is as follows:
7. parachute kit for the automatic activation of a backup parachute in case of a failure of a main parachute according to any of claims 1 to 7, characterized in that the activation pin (6) is pulled out when the parachute-mounted system leaves the aircraft when the other end of the activation pin (6) is connected to the aircraft; when the other end of the starting pin (6) is hung on the load (3), a worker pulls out the starting pin (6) as required, and when the starting pin (6) is separated from the electronic starting device (4), the electronic starting device (4) is triggered to start working.
8. Method for opening parachute kit with automatic activation of backup parachute upon failure of primary parachute according to any of claims 1 to 7, characterized in that the backup parachute (2) emergency parachute opening control logic is the parachute-mounted system is taken off-line for a certain time T 0 Or down to a certain safety height H 0 Then, whether the vertical descending speed of the umbrella-mounted system is greater than the safe speed V or not is judged 0 Satisfy T ≧ T at the same time 0 Or H is less than or equal to H 0 、V≤V 0 The main umbrella (1) is considered to be normally opened, the emergency opening condition of the backup umbrella (2) is not met, and the backup umbrella (2) does not need to be opened; otherwise, T is more than or equal to T 0 Or H is less than or equal to H 0 、V＞V 0 The main umbrella (1) is not normally opened and the backup umbrella (2) is required to be opened.
9. The method for opening parachute equipment to automatically start a backup parachute in case of a failure of a main parachute as recited in claim 8, comprising the following steps:
step 1: before the parachute-mounted system boards on the airplane or leaves the airplane, specific parameters, safety height H0 and safety speed V0 of parachute opening control logic elements of the backup parachute (2) are set according to the parachute drop task section;
step 2: after the umbrella-mounted system is on board or before the umbrella-mounted system leaves the airplane, the other end of the starting pin (6) is connected to the airplane;
and step 3: when the umbrella-mounted system leaves the airplane, the starting pin (6) hung on the airplane is pulled out, the starting pin (6) is separated from the electronic starting device (4), and the electronic starting device (4) is triggered to start working;
and 4, step 4: after the umbrella-mounted system leaves the aircraft, the main umbrella (1) adopts a primary umbrella opening mode and is inflated to open;
and 5: the temperature and pressure sensor (10) measures the atmospheric static pressure P and the atmospheric static temperature T of the area where the umbrella-mounted system is located, the measured atmospheric static pressure P and the measured atmospheric static temperature T are transmitted to the host MCU11, the host MCU11 firstly resolves the atmospheric static pressure P into a height value H of the area where the umbrella-mounted system is located, and then resolves the height difference within unit time into a real-time vertical descending speed V of the umbrella-mounted system through the height value H;
and 6: in the descending process of the umbrella-mounted system, if the calculation result is obtained according to the host MCU11, after the umbrella-mounted system is descended to a certain safe height H0 after leaving the aircraft, whether the vertical descending speed of the umbrella-mounted system is greater than a safe speed V0 is judged, H is less than or equal to H0 and V is less than or equal to V0 are met simultaneously, the main umbrella 1 is considered to be normally opened, the emergency opening condition of the backup umbrella (2) is not met, and the backup umbrella (2) does not need to be opened; otherwise, H is less than or equal to H0, V is more than V0, the main umbrella 1 is considered to be abnormally opened, and the backup umbrella (2) needs to be opened;
and 7: the main umbrella (1) or the backup umbrella (2) falls with the load (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211708636.2A CN115806052A (en) | 2022-12-29 | 2022-12-29 | Parachute equipment for automatically starting backup parachute in case of failure of main parachute and opening method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211708636.2A CN115806052A (en) | 2022-12-29 | 2022-12-29 | Parachute equipment for automatically starting backup parachute in case of failure of main parachute and opening method |
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| CN115806052A true CN115806052A (en) | 2023-03-17 |
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| CN202211708636.2A Pending CN115806052A (en) | 2022-12-29 | 2022-12-29 | Parachute equipment for automatically starting backup parachute in case of failure of main parachute and opening method |
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