CN112683504B - Portable automatic parachute opening device detector - Google Patents
Portable automatic parachute opening device detector Download PDFInfo
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- CN112683504B CN112683504B CN202011444527.5A CN202011444527A CN112683504B CN 112683504 B CN112683504 B CN 112683504B CN 202011444527 A CN202011444527 A CN 202011444527A CN 112683504 B CN112683504 B CN 112683504B
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Abstract
The invention discloses a portable automatic parachute opening device detector. The device comprises a mechanical system, wherein the mechanical system is respectively connected with an electric control system and an air circuit system; the mechanical system comprises a cabin body capable of realizing sealing, and a locking mechanism, a needle drawing mechanism and a temperature and pressure integrated sensor are arranged in the cabin body; the locking mechanism comprises a guide rail, the head end and the tail end of the guide rail are respectively provided with a stop block, a slide block is connected in the guide rail between the two stop blocks in a sliding way, the slide block is connected with a drag hook, and an umbrella opening photoelectric switch is also arranged at the tail end close to the guide rail; the needle drawing mechanism comprises a base fixedly arranged in the bin body, a pull rod is connected onto the base in a sliding mode, a spring is arranged between the pull rod and the base, and a needle drawing photoelectric switch is arranged in the extending direction of the tail end of the pull rod; the side of the pull rod is also provided with a thimble, and an electromagnet is arranged beside the thimble. The invention has the characteristics of compact structure, convenience in carrying and multiple functions.
Description
Technical Field
The invention belongs to the technical field of parachute detection, and relates to a portable automatic parachute opener detector.
Background
The parachute is a deployable pneumatic decelerator which is deployed by inflating with respect to the air movement by using the principle of air resistance. Modern parachutes are aerial vehicles that safely land a person or thing from the air to the ground. The parachute opening device test is an important index for parachute safety detection, and aims to test the parachute opening condition of the parachute opening device under different high-altitude air pressures. The prior detector for the parachute opening device of the parachute has the following defects: the detection instrument is bulky and inconvenient to carry, and often an instrument can only carry out single test, and the function is single.
Disclosure of Invention
The purpose of the invention is: provides a portable detector for an automatic parachute opening device. The invention has the characteristics of compact structure, convenience in carrying and multiple functions.
The technical scheme of the invention is as follows: a portable detector for an automatic parachute opening device comprises a mechanical system, wherein the mechanical system is respectively connected with an electric control system and an air circuit system; the mechanical system comprises a cabin body capable of realizing sealing, and a locking mechanism, a needle drawing mechanism and a temperature and pressure integrated sensor are arranged in the cabin body; the locking mechanism comprises a guide rail, the head end and the tail end of the guide rail are respectively provided with a stop block, a slide block is connected in the guide rail between the two stop blocks in a sliding way, the slide block is connected with a drag hook, and an umbrella opening photoelectric switch is also arranged at the tail end close to the guide rail; the needle drawing mechanism comprises a base fixedly arranged in the bin body, a pull rod is connected on the base in a sliding manner, a spring is arranged between the pull rod and the base, and a needle drawing photoelectric switch is arranged in the extending direction of the tail end of the pull rod; the side of the pull rod is also provided with a thimble, and an electromagnet is arranged beside the thimble.
In the portable automatic parachute opening device detector, the electric control system comprises a PLC controller, and the PLC controller is respectively connected with the needle-drawing photoelectric switch, the parachute opening photoelectric switch, the temperature and pressure integrated sensor, the electromagnet, and the air circuit system.
In the portable automatic parachute opening device detector, the gas path system comprises a vacuum pump, and the vacuum pump is connected with the chamber body through an electromagnetic valve; the PLC controller is also respectively connected with the electromagnetic valve and the vacuum pump.
In the portable automatic parachute opening device detector, the vacuum pump is connected with the PLC through the relay, and the PLC is prevented from being burnt out due to the overlarge current of the relay.
In the portable automatic parachute opening device detector, the electromagnet is connected with the PLC controller through the relay.
In the portable automatic parachute opening device detector, the guide rail is provided with the support block at a position close to the head end stop block, the support block is detachably hinged to one end of the pressing rod, the pressing rod is detachably hinged to one end of the connecting rod, and the other end of the connecting rod is movably connected with the sliding block.
In the portable automatic umbrella opener detector, more than one pin hole is arranged on the rod body of the pressure rod, and any pin hole can be detachably hinged with one end of the connecting rod through a plug pin.
In the portable automatic umbrella opener detector, the pull rod head end is connected with a pull rope.
In the portable automatic parachute opening device detector, the chamber body is of an up-and-down split type chamber body structure.
The invention has the advantages that: the locking mechanism and the needle drawing mechanism are matched with each other to simulate the locking and needle drawing operations of the umbrella opener, the air pressure in the cabin body is controlled by the air path system to simulate different altitudes, and finally the simulated data is acquired and processed by the electric control system to output the detection condition; through the mutual cooperation among the mechanical system, the electric control system and the air circuit system, the real working process of the umbrella opener can be simulated, so that the detection result is more in line with the actual situation, and the detection precision is improved.
The invention can integrate a mechanical system, an electric control system and an air circuit system in a cabin, has more compact volume like a detector, is convenient to carry, can realize the carrying requirement of a single person, better meets the requirement of field operation, and has strong applicability.
The invention can integrate the performance inspection of the time type parachute opening device and the performance inspection of the height type parachute opening device into a detector for detection, and has various functions.
In conclusion, the multifunctional portable chair has the characteristics of compact structure, convenience in carrying and multiple functions.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the assembly structure of the locking mechanism and the needle drawing mechanism;
FIG. 3 is a front view of the locking mechanism;
FIG. 4 is a top view of the needle drawing mechanism;
fig. 5 is an electrical schematic block diagram of the present invention.
Reference numerals are as follows: 1-cabin body, 2-locking mechanism, 21-guide rail, 22-stop block, 23-slide block, 24-drag hook, 25-umbrella opening photoelectric switch, 26-support block, 27-pressure rod, 28-connecting rod, 29-pin hole, 3-needle drawing mechanism, 31-base, 32-pull rod, 33-spring, 34-needle drawing photoelectric switch, 35-thimble, 36-electromagnet, 37-pull rope, 4-temperature and pressure integrated sensor, 5-measured umbrella opener and 6-lock needle.
Detailed Description
The invention is further described with reference to the following figures and examples, which are not to be construed as limiting the invention.
Example 1. A portable automatic parachute opening device detector is formed as shown in figures 1-5 and comprises a mechanical system, wherein the mechanical system is connected with an electric control system and an air circuit system respectively; the mechanical system comprises a cabin body 1 capable of realizing sealing, wherein a locking mechanism 2, a needle drawing mechanism 3 and a temperature and pressure integrated sensor 4 are arranged in the cabin body 1; the locking mechanism 2 comprises a guide rail 21 fixedly arranged in the bin body 1 along the locking direction, the head end and the tail end of the guide rail 21 are both provided with a stop block 22, a slide block 23 is connected in the guide rail 21 between the two stop blocks 22 in a sliding way, the slide block 23 is connected with a draw hook 24, and the tail end close to the guide rail 21 is also provided with an umbrella opening photoelectric switch 25; the needle drawing mechanism 3 comprises a base 31 fixedly arranged in the bin body 1, a pull rod 32 is connected to the base 31 in a sliding mode along the needle drawing direction, a spring 33 is arranged between the pull rod 32 and the base 31, and a needle drawing photoelectric switch 34 is arranged in the extending direction of the tail end of the pull rod 32; a thimble 35 is further disposed on a side of the pull rod 32, an electromagnet 36 is disposed beside the thimble 35, and the electromagnet 36 can control the thimble 35 to move in a direction perpendicular to a central axis of the pull rod 32 to limit/release the pull rod 32.
A needle drawing photoelectric switch 34 for detecting the needle drawing action of the needle drawing mechanism 3;
an umbrella opening photoelectric switch 25 for detecting an umbrella opening action to lock the mechanism 2;
the temperature and pressure integrated sensor 4 is used for collecting the temperature and pressure of the bin body 1;
an electromagnet 36 for controlling the needle drawing action;
and the electromagnetic valve is used for controlling the gas circuit and adjusting the pressure of the bin body 1.
The working process of the detector is as follows:
when the performance of the time type parachute opening device is checked, the drag hook 24 of the locking mechanism 2 is connected with the tested parachute opening device 5, and the slide block 23 is pushed after the connection, so that the drag hook 24 pulls the zipper of the tested parachute opening device 5 to lock the tested parachute opening device 5; after locking, inserting the locking needle 6 into the jack of the tested umbrella opener 5, and connecting the locking needle 6 to the pull rod 32 to complete preparation work during testing;
the electromagnet 36 is electrified to attract the thimble 35 to move, the pull rod 32 is released, the pull rod 32 pulls out the lock pin 6 under the action of the restoring force of the spring 33, and the thimble pulling photoelectric switch 34 is triggered; after the locking needle 6 is pulled out, the tested parachute opener 5 rebounds to unlock, and the drag hook 24 and the slide block 23 are pulled back together to touch the parachute opening photoelectric switch 25; recording the time difference between the touch of the needle drawing photoelectric switch 34 and the touch of the parachute opening photoelectric switch 25, namely the unlocking time, comparing the unlocking time with the standard unlocking time, and judging whether the detected parachute opener is qualified or not.
When the performance of the height type parachute opening device is checked, the preparation work during the test is completed according to the method;
the gas path system is used for pumping air to the bin body 1, the temperature and pressure integrated sensor 4 in the bin body 1 is used for collecting a pressure value in the bin body 1, the pressure value is calculated to be a corresponding height value (namely a simulated height value) through the pressure value, when the simulated height value of the bin body 1 exceeds a measured height working point of the measured parachute opening device 5 by a certain value, the air pumping is stopped, the bin body 1 is slowly inflated, the simulated height value in the bin body 1 is slowly reduced, when the simulated height value is reduced to the measured height working point of a product, the needle drawing mechanism 3 pulls out the lock needle 6, the measured parachute opening device 5 is unlocked, and the parachute opening photoelectric switch 25 is triggered to work; the simulated height value at this time is recorded, and the value of the simulated height value + the simulated height descending speed multiplied by the unlocking time at this time is the actual unlocking height value of the measured parachute opening device 5. And repeating the operation, and selecting another working point with the measured height for detection. And after the detection is finished, taking out the detected umbrella opener 5 and turning off the power supply.
The electric control system comprises a PLC (programmable logic controller), and the PLC is respectively connected with the needle drawing photoelectric switch 34, the umbrella opening photoelectric switch 25, the temperature and pressure integrated sensor 4, the electromagnet 36 and the air path system.
The unlocking time is recorded by a PLC (programmable logic controller), the power-on work of the electromagnet 36 is controlled by the PLC, the simulated height value is obtained by the PLC through operation according to the pressure value collected by the temperature and pressure integrated sensor 4, and the final actual unlocking height value is also obtained through operation by the PLC.
The gas path system comprises a vacuum pump which is connected with the bin body 1 through an electromagnetic valve; the PLC controller is also respectively connected with the electromagnetic valve and the vacuum pump. The air path system is used for pumping/inflating the bin body 1 by controlling a vacuum pump and an electromagnetic valve by a PLC controller.
The vacuum pump is connected with the PLC controller through the relay (controls the vacuum pump to start and stop), and the PLC is prevented from being burnt out due to the overlarge current of the relay.
The electromagnet 36 is connected with the PLC controller through a relay (controlling the electromagnet 36 to be switched on and off), and the PLC is prevented from being burnt out due to overlarge current of the relay.
The aforementioned guide rail 21 is provided with a support block 26 at a position close to the head end stop 22, the support block 26 is detachably hinged to one end of a pressure lever 27, the pressure lever 27 is detachably hinged to one end of a connecting rod 28, and the other end of the connecting rod 28 is movably connected to the slider 23. The slide block 23 is pushed down by a pressure lever 27 and is linked with a connecting rod 28; through this structure, can conveniently promote slider 23 laborsavingly, and then realize locking of surveying parachute-opening ware 5 laborsavingly, after last lock is accomplished, can also demolish depression bar 27, do not occupy storehouse body 1 space, more be favorable to the equipment miniaturization, increase the portability.
More than one pin hole 29 is arranged on the rod body of the pressure lever 27, and any pin hole 29 can be detachably hinged with one end of the connecting rod 28 through a bolt. Because the measured parachute opening device needs large force for unlocking, the unlocking can be more labor-saving according to the lever principle through the structure, and the labor intensity is reduced.
The pull rope 37 is connected to the head end of the pull rod 32.
The bin body 1 is of an up-down split type bin body structure. This structure is convenient for dismantling the compression bar 27 for testing.
According to the portable lithium battery pack power module, the BMS battery management module is selected for use, the SOC accurate electric quantity prediction of the lithium battery pack can be realized through the management module, the balanced charge and discharge control and the triple safety protection design are realized, the safe charging of the lithium battery pack under the field portable use scene is ensured, the lossless discharging is realized, and the power supply requirement of continuous 5-hour test work is met.
The detector also selects a DOP-107BV type touch screen for human-computer interaction, so that the operation and display are more visual.
The aforesaid storehouse body 1 is split type from top to bottom, conveniently demolishs the test with depression bar 27.
Example 2. The detector of the invention is composed of a bin body 1, a locking mechanism 2, a needle drawing mechanism 3, an air channel system, an electric control system and a battery system as shown in figures 1-5. The bin body 1 is made of aluminum-plastic plates. The locking mechanism 2 is composed of mechanical components. The needle drawing mechanism 3 is composed of mechanical components and an electromagnet 36. The gas circuit system comprises a bin body 1, a vacuum pump (particularly a direct-current small vacuum pump) and an electromagnetic valve. The electric control system is composed of a touch screen, a PLC (programmable logic controller), a temperature and pressure integrated sensor 4, a relay and the like. The battery system is composed of a lithium battery pack, a battery management module, a charging port and a charging adapter.
The battery pack is connected with the input of the battery management module; the output of the battery management module is connected with the electromagnetic valve, the electromagnet, the temperature and pressure integrated sensor 4, the photoelectric switch (comprising an umbrella opening photoelectric switch 25 and a needle drawing photoelectric switch 34), the direct current small vacuum pump, the touch screen and the power supply of the PLC controller; the charging adapter is connected with the lithium battery pack through a charging port; the touch screen is connected with the PLC through a special communication cable; the output end of the temperature and pressure integrated sensor 4 is connected with an RS485 communication port of the PLC controller; the output end of the PLC is connected with the control end of the relay, and the output of the relay is connected with the input of the electromagnetic valve; the output end of the photoelectric switch is connected with the input end of the PLC controller; the output port of the direct current small vacuum pump is connected with the input port of the electromagnetic valve through a vacuum rubber tube; the output port of the electromagnetic valve, the interface of the bin body 1 and the pressure interface of the temperature and pressure integrated sensor 4 are connected together through a vacuum rubber tube.
The bin body 1 is divided into an upper part and a lower part, wherein the upper part is a bin cover, and the lower part is a device carrier.
The locking mechanism 2, the needle drawing mechanism 3, the electric control system and the gas path system are all arranged at the lower part of the bin body 1.
The locking mechanism comprises a guide rail 21, a stop block 22, a slide block 23, a draw hook 24, an umbrella opening photoelectric switch 25, a support block 26, a pressure rod 27, a connecting rod 28, a pin hole 29 and the like. In the locking process, the draw hook 24 is used for connecting the lock head of the tested parachute opening device 5 to the slide block 23, the press rod 27 is pressed down to drive the slide block 23 to run on the guide rail 21, and the draw hook 24 is pulled to lock the tested parachute opening device 5. The mechanism reduces the force required during locking through a lever principle, and reduces the labor intensity of operators.
The needle drawing mechanism 3 is composed of a base 31, a pull rod 32, a spring 33, a needle drawing photoelectric switch 34, a thimble 35, an electromagnet 36, a pull rope 37 and the like. When the lock pin 6 is inserted, the thimble 35 of the electromagnet 36 is clamped into the ring groove of the pull rod 32 to lock the pull rod 32 and ensure the insertion state; when the electromagnet works, the thimble 35 retracts, and the pull rod 32 withdraws the lock pin 6 under the action of the spring 33.
The temperature and pressure data tested by the temperature and pressure integrated sensor 4 are output to the variable logic controller in the form of RS485 codes.
And the PLC is displayed and operated through the touch screen.
The using method of the invention is as follows:
first, a battery mode and a power mode are selected according to trial power requirements. The switch is then opened.
1. Temporal parachute opener performance check
The tested umbrella opener is arranged in the bin body; the locking needle 6 is inserted into the opener insertion hole, and the locking mechanism is used to lock the tested opener 5. And turning on a power switch, and clicking a control on the touch screen to enter a time type parachute opening device test interface. Clicking the 'pulling lock pin', pulling the lock pin by the pulling pin mechanism at the moment, touching the pulling pin photoelectric switch 34, and starting timing by the PLC controller; when the tested umbrella opener 5 is unlocked, the photoelectric switch 25 for opening the umbrella is triggered to stop timing. And observing whether the time display value on the touch screen meets the performance requirement of the detected umbrella opener. And after the detection is finished, taking out the detected umbrella opener 5 and turning off the power supply.
2. High profile parachute opener performance check
And turning on a power switch, and clicking a control on the touch screen to enter a testing interface of the height type umbrella opener. And testing and presetting a plurality of tested height working points on the test interface. The tested umbrella opener 5 is arranged in the bin body; the locking needle 6 is inserted into the jack of the tested umbrella opener 5, the tested umbrella opener 5 is locked by the locking mechanism, and the sealing cover plate is covered. And clicking a certain measured height working point control to start testing. The PLC controller controls the direct-current small vacuum pump to vacuumize the bin body 1, a pressure interface of the temperature-pressure integrated sensor 4 collects a pressure value in the bin body 1, and the pressure value is transmitted to the PLC controller and is displayed on the touch screen after being calculated into a corresponding simulation height value. When the simulated height value of the bin body 1 exceeds the measured height working point of the measured parachute opening device 5 by a certain value, closing an air suction valve of a vacuum pump, opening an air release valve, slowly reducing the simulated height value in the bin body 1, and when the simulated height value is reduced to the measured height working point of a product, unlocking the measured parachute opening device and triggering the parachute opening photoelectric switch 25 to work; the PLC memorizes the simulated height value at the moment, and the simulated height value plus the simulated height descending speed multiplied by the unlocking time value is the actual unlocking height value of the tested parachute opening device 5. Repeating the operation, and selecting another working point with the measured height for detection. And after the detection is finished, taking out the detected umbrella opener, and turning off the power supply.
Specifically, a PLC controller is selected from Mitsubishi FX3U-16MT/DC, a temperature and pressure integrated sensor 4 is selected from DPS-811A-TA-A1-CC-H0-PK of Deluker company, a touch screen is selected from DOP-107BV, an electromagnetic valve is selected from SDPC-DC24V, a relay is selected from ohm dragon G5V-2-24V, an electromagnet is selected from XDA-27, and other parts are metal self-made parts.
Claims (8)
1. A portable detector for an automatic parachute opening device is characterized by comprising a mechanical system, wherein the mechanical system is respectively connected with an electric control system and an air circuit system; the mechanical system comprises a cabin body (1) capable of realizing sealing, wherein a locking mechanism (2), a needle drawing mechanism (3) and a temperature and pressure integrated sensor (4) are arranged in the cabin body (1); the locking mechanism (2) comprises a guide rail (21), stop blocks (22) are arranged at the head end and the tail end of the guide rail (21), a sliding block (23) is connected in the guide rail (21) between the two stop blocks (22) in a sliding mode, the sliding block (23) is connected with a draw hook (24), and an umbrella opening photoelectric switch (25) is further arranged at the tail end close to the guide rail (21); the needle drawing mechanism (3) comprises a base (31) fixedly arranged in the bin body (1), a pull rod (32) is connected onto the base (31) in a sliding manner, a spring (33) is arranged between the pull rod (32) and the base (31), and a needle drawing photoelectric switch (34) is arranged in the extending direction of the tail end of the pull rod (32); a thimble (35) is arranged on the side edge of the pull rod (32), and an electromagnet (36) is arranged beside the thimble (35); the guide rail (21) is provided with a support block (26) at a position close to the head end stop block (22), the support block (26) is detachably hinged with one end of a pressure lever (27), the pressure lever (27) is detachably hinged with one end of a connecting rod (28), and the other end of the connecting rod (28) is movably connected with a sliding block (23).
2. The portable automatic parachute opening device detector according to claim 1, wherein the electrical control system comprises a PLC controller, and the PLC controller is connected to the needle-drawing photoelectric switch (34), the parachute-opening photoelectric switch (25), the temperature and pressure integrated sensor (4), the electromagnet (36) and the air circuit system, respectively.
3. The portable automatic parachute opening device detector according to claim 2, wherein the gas path system comprises a vacuum pump, and the vacuum pump is connected with the chamber body (1) through an electromagnetic valve; the PLC controller is also respectively connected with the electromagnetic valve and the vacuum pump.
4. The portable automatic parachute opener detector of claim 3, wherein the vacuum pump is connected to the PLC controller through a relay, and the relay is supplied with excessive current to avoid burning out the PLC.
5. The portable automatic parachute opener detector of claim 2, wherein the electromagnet (36) is connected to the PLC controller through a relay.
6. The portable automatic parachute opening device detector as set forth in claim 1, wherein more than one pin hole (29) is arranged on the shaft of the pressing rod (27), and any one pin hole (29) can be detachably hinged to one end of the connecting rod (28) through a pin.
7. The portable automatic parachute opening device detector as set forth in claim 1, wherein a pull cord (37) is connected to a head end of the pull rod (32).
8. The portable automatic parachute opening device detector according to claim 1, wherein the cartridge body (1) has an upper and lower split cartridge body structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011444527.5A CN112683504B (en) | 2020-12-11 | 2020-12-11 | Portable automatic parachute opening device detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011444527.5A CN112683504B (en) | 2020-12-11 | 2020-12-11 | Portable automatic parachute opening device detector |
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| CN112683504A CN112683504A (en) | 2021-04-20 |
| CN112683504B true CN112683504B (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011444527.5A Active CN112683504B (en) | 2020-12-11 | 2020-12-11 | Portable automatic parachute opening device detector |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116104361A (en) * | 2022-12-29 | 2023-05-12 | 武汉航空仪表有限责任公司 | Electric unlocking device |
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| DE3931168A1 (en) * | 1989-09-19 | 1991-03-28 | Diehl Gmbh & Co | Ammunition target-detector locking device - has non-circular stop turning at window through which detector is extended |
| CN1645278A (en) * | 2005-01-13 | 2005-07-27 | 南京航程科技有限公司 | Electronic automatic opening controller for parachute |
| CN202372204U (en) * | 2011-11-18 | 2012-08-08 | 武汉航空仪表有限责任公司 | Testing device for parachute opener |
| CN205620257U (en) * | 2016-05-06 | 2016-10-05 | 武汉航空仪表有限责任公司 | Wear -resisting test device of parachute opening device |
| CN108106807A (en) * | 2017-12-19 | 2018-06-01 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of test method for measuring high-speed wind tunnel parachute model parachute-opening characteristic |
| CN209297761U (en) * | 2018-12-29 | 2019-08-23 | 大连长丰实业总公司 | A kind of semi-automatic parachute opening device of Lifesaving chair determines table time adjusting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7819031B2 (en) * | 2008-03-27 | 2010-10-26 | The United States Of America As Represented By The Secretary Of The Navy | Parachute opening and shock emulator |
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2020
- 2020-12-11 CN CN202011444527.5A patent/CN112683504B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3931168A1 (en) * | 1989-09-19 | 1991-03-28 | Diehl Gmbh & Co | Ammunition target-detector locking device - has non-circular stop turning at window through which detector is extended |
| CN1645278A (en) * | 2005-01-13 | 2005-07-27 | 南京航程科技有限公司 | Electronic automatic opening controller for parachute |
| CN202372204U (en) * | 2011-11-18 | 2012-08-08 | 武汉航空仪表有限责任公司 | Testing device for parachute opener |
| CN205620257U (en) * | 2016-05-06 | 2016-10-05 | 武汉航空仪表有限责任公司 | Wear -resisting test device of parachute opening device |
| CN108106807A (en) * | 2017-12-19 | 2018-06-01 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of test method for measuring high-speed wind tunnel parachute model parachute-opening characteristic |
| CN209297761U (en) * | 2018-12-29 | 2019-08-23 | 大连长丰实业总公司 | A kind of semi-automatic parachute opening device of Lifesaving chair determines table time adjusting device |
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