A delayed release device and a parachute capable of delayed release

Abstract

This invention discloses a delayed delivery device installed on an airdrop carrier, comprising a guide parachute; a sealing mechanism including sealing blades and a binding rope, wherein the sealing blades are used to seal the guide parachute, and the binding rope passes through the sealing blades and secures and locks the guide parachute; a fixing mechanism, with a fixed end connected to the airdrop carrier and a movable end detachably connected to the sealing blades; and a cutting mechanism including a cutter and a pull rope, wherein the cutter is installed on the binding rope, and the pull rope is connected to the cutter, and the pull rope is used to receive force and trigger the cutter to cut the binding rope. The beneficial effect of this invention is that, through the dual adjustment mode of the pull rope length and the cutter delay, it can adapt to various airdrop conditions such as complex airflow, delivery speed fluctuations, and high and low altitudes, solving the problem of fixed delay parameters that cannot be dynamically adjusted.

Description

Technical Field

[0001] This invention relates to the field of parachute accessories, and more specifically to a delayed deployment device. Background Technology

[0002] As a core deceleration and braking device in airdrop operations, the timing and speed of parachute deployment directly determine the landing safety of the payload, the structural integrity of the parachute system, and the overall success or failure of the mission. In scenarios such as high-speed airdrops, low-altitude drops, and large-mass payload drops, if the main parachute opens too early, the canopy and lines will be subjected to instantaneous aerodynamic impact loads, which can easily lead to malfunctions such as canopy tearing, line breakage, and excessive deployment load. This can result in damage to supplies or, in severe cases, safety accidents and mission failure. Conversely, if the main parachute opens too late, insufficient deceleration and excessively high landing speeds will occur, also failing to meet operational requirements. Therefore, precise and controllable delayed deployment technology is a key element in bridging parachute design theory with actual airdrop conditions and ensuring airdrop safety.

[0003] Currently, mainstream parachute delayed deployment technologies mainly fall into two categories: one is a fixed-time delay device, which relies on mechanical or electronic timing to achieve the delay. This method has fixed delay parameters and cannot adapt to complex airflow disturbances, deployment speed fluctuations, altitude changes, and other actual conditions during airdrops, resulting in poor delay accuracy and weak adaptability. The other is a barometric altimeter delay mechanism, which determines the deployment altitude by sensing atmospheric pressure and then triggers the deployment. This method is susceptible to pressure fluctuations and environmental interference in low-altitude, high-speed, complex weather, and special terrain airdrop scenarios, exhibiting insufficient trigger sensitivity and limited delay control accuracy, making it difficult to achieve fine-tuning of the deployment speed. Therefore, this application proposes a parachute delayed deployment device. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a delayed delivery device to solve the technical problems of non-adjustable delay parameters and poor adaptability to operating conditions in the prior art.

[0005] In a first aspect, the technical solution of the present invention provides a delayed delivery device, installed on an airdrop carrier, including a guide umbrella; A sealing mechanism includes sealing blades and binding ropes, wherein the sealing blades are used to seal the guide umbrella, and the binding ropes pass through the sealing blades and secure the guide umbrella. A fixing mechanism, with its fixed end connected to the airdrop carrier and its movable end detachably connected to the sealing blade; and... A cutting mechanism includes a cutter and a pull cord. The cutter is mounted on the binding rope, and the pull cord is connected to the cutter. The pull cord is used to apply force and trigger the cutter to cut the binding rope.

[0006] In some embodiments, the sealing blade includes a ring, a fixing strap, and a blade fabric. The ring is connected to the blade fabric via the fixing strap, and the ring is used for a binding rope to pass through in order to tighten the blade fabric.

[0007] In some embodiments, the fixing mechanism includes a fixing plate and a screw. The fixing plate has a first mounting hole, the sealing blade has a second mounting hole, the screw passes through the first mounting hole and the second mounting hole, and the screw is threadedly connected to the airdrop carrier.

[0008] In some embodiments, the sealing blade further includes a reinforcing strip connected to the periphery of the blade fabric, the fixing piece abutting against the reinforcing strip, and the reinforcing strip having a third mounting hole, the first mounting hole, the second mounting hole, and the third mounting hole corresponding to each other.

[0009] In some embodiments, the cutter includes a housing, a trigger, a propellant head, a propellant cartridge, a piston rod, a shearing pin, a cutter, and retaining rings. The trigger, propellant head, and propellant cartridge are sequentially installed within the housing. The pull cord is connected to the trigger, the trigger is connected to the propellant head, and the propellant head is connected to the propellant cartridge. The housing has a pressurizing chamber and a guiding chamber. The end of the propellant cartridge away from the propellant head faces the pressurizing chamber, and the pressurizing chamber communicates with the guiding chamber. The piston rod is fixedly connected to the guiding chamber by the shearing pin. The cutter is connected to the piston rod, and the cutter maintains a predetermined gap with the binding cord. Both retaining rings are connected to the housing, and the binding cord passes through the two retaining rings sequentially.

[0010] In some embodiments, the cutter is annular, the cutting edge of the cutter is located on the inside, and the binding rope passes through the cutter.

[0011] In some embodiments, the cutter further includes an adjustment assembly comprising a sealing plate and a cylinder, the sealing plate being slidably connected within the pressurization chamber, the cylinder being mounted on the housing, the piston rod of the cylinder being connected to the sealing plate, and the power of the cylinder being greater than the load-bearing capacity of the shearing pin.

[0012] In some embodiments, the cutter further includes an insulation sleeve connected to the housing to maintain a stable temperature within the housing.

[0013] In some embodiments, the propellant column includes a main combustion column, a low-temperature combustion-supporting column, and a high-temperature slow-burning column. The main combustion column is connected within the housing, and a plurality of low-temperature combustion-supporting columns and high-temperature slow-burning columns are spaced apart within the main combustion column. Both the low-temperature combustion-supporting columns and the high-temperature slow-burning columns extend along the length direction of the main combustion column.

[0014] Secondly, this application provides a delayed-deployment parachute, including a main parachute pack, connecting straps, fixing ropes, and sealing ropes. One end of the connecting strap is connected to the pilot parachute, and the other end of the connecting strap is connected to the main parachute pack. The main parachute pack is placed on the airdrop carrier. One end of each of the fixing ropes is connected to the airdrop carrier, and the sealing rope passes through the other end of the fixing ropes to secure and lock the main parachute pack.

[0015] Compared with the prior art, the beneficial effects of the present invention include: The delay parameters are flexible and adjustable, and the adaptability to various working conditions is strong. It eliminates the drawbacks of fixed delay and passive air pressure triggering. Through the dual adjustment mode of the pull rope length and the cutter delay, it can adapt to various airdrop working conditions such as complex airflow, drop speed fluctuations, and high and low altitudes, and solve the problem of fixed delay parameters that cannot be dynamically adjusted. It features reliable triggering and high delay accuracy. It adopts a pure mechanical pull-trigger mode, which is not affected by environmental factors such as air pressure, weather, and terrain. It can still trigger stably in low-altitude and high-speed scenarios. The delay control is precise, effectively avoiding defects such as false triggering, failure to trigger, and excessive delay deviation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the delivery device, airdrop carrier, and parachute provided by the present invention. Figure 2 This is a schematic diagram of the overall structure of the guide parachute and main parachute pack provided by the present invention; Figure 3 This is a first-view overall structural diagram of the packaging mechanism provided by the present invention; Figure 4 This is a second-view overall structural schematic diagram of the packaging mechanism provided by the present invention; Figure 5 This is a second-view overall structural cross-sectional view of the packaging mechanism provided by the present invention; Figure 6 This is a schematic diagram of the overall structure of the fixing piece provided by the present invention; Figure 7 This is a cross-sectional view of the overall structure of the cutting mechanism provided by the present invention; Figure 8 This is a cross-sectional view of the overall structure of the drug column provided by the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Drop vehicle; 2. Parachute; 21. Main parachute pack; 22. Connecting strap; 23. Fixing rope; 24. Sealing rope; 3. Guiding parachute; 4. Packing mechanism; 41. Packing blade; 411. Ring; 412. Fixing strap; 413. Blade fabric; 414. Reinforcing strap; 42. Binding rope; 5. Fixing mechanism; 51. Fixing plate; 52. Screw; 53. First mounting hole; 54. Second mounting hole; 6. Cutting mechanism; 61. Cutter; 62. Pull cord; 7. Shell; 71. Trigger; 72. Propellant head; 73. Propellant charge; 731. Main combustion charge; 732. Low-temperature combustion aid charge; 733. High-temperature slow combustion charge; 74. Piston rod; 75. Shearing pin; 76. Cutter; 77. Fixing ring; 78. Pressurization chamber; 79. Guide chamber; 8. Adjustment assembly; 81. Sealing plate; 82. Cylinder; 9. Insulation sleeve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] This invention provides a delayed delivery device, the structure of which is as follows: Figure 1 - Figure 8 As shown, it is installed on the airdrop carrier, including the guide parachute; A sealing mechanism includes sealing blades and binding ropes, wherein the sealing blades are used to seal the guide umbrella, and the binding ropes pass through the sealing blades and secure the guide umbrella. A fixing mechanism, with its fixed end connected to the airdrop carrier and its movable end detachably connected to the sealing blade; and... A cutting mechanism includes a cutter and a pull cord. The cutter is mounted on the binding rope, and the pull cord is connected to the cutter. The pull cord is used to apply force and trigger the cutter to cut the binding rope.

[0020] In use, the delayed delivery device is pre-installed on the airdrop carrier 1. The sealing mechanism 4 wraps the guide umbrella 3 with sealing blades 41, and the binding rope 42 passes through the sealing blades 41 to firmly bind and lock the guide umbrella 3, so that the guide umbrella 3 is in a ready-to-deliver energy storage state. The fixing mechanism 5 securely connects the sealing blades 41 to the airdrop carrier 1 to ensure that the device is structurally stable and does not shift during the airdrop process. After the airdrop carrier 1 is separated from the carrier, it falls and accelerates. The pull rope 62 gradually straightens and is stressed as the platform moves, which in turn mechanically triggers the cutter 61 to start. After receiving the trigger signal, the cutter 61 enters a delayed standby state. After the preset delay time is reached, it immediately performs the cutting action to cut the binding rope 42. After the binding rope 42 breaks, the binding force of the sealing blade 41 on the guide umbrella 3 disappears, the guide umbrella 3 unlocks and pops out, and enters the airflow to inflate and unfold, and then pulls the main umbrella to complete the opening action; by preset and adjusting the length of the pull rope 62, the triggering timing of the cutter 61 can be controlled. Combined with the dual adjustment of the delay time of the cutter 61 itself, the timing of the unlocking of the guide umbrella 3 and the pulling out of the main umbrella can be precisely controlled, thereby realizing flexible control of the opening speed of the main umbrella.

[0021] In this invention, the delay parameter is flexibly adjustable and highly adaptable to various working conditions. It eliminates the drawbacks of fixed delay and passive air pressure triggering. Through the dual adjustment mode of the length of the hair-pulling rope 62 and the delay of the cutter 61, it can adapt to various airdrop working conditions such as complex airflow, drop speed fluctuations, and high and low altitudes, thus solving the problem of fixed delay parameters that cannot be dynamically adjusted.

[0022] It features reliable triggering and high delay accuracy. It adopts a pure mechanical pull-trigger mode, which is not affected by environmental factors such as air pressure, weather, and terrain. It can still trigger stably in low-altitude and high-speed scenarios. The delay control is precise, effectively avoiding defects such as false triggering, failure to trigger, and excessive delay deviation.

[0023] To lock and release the guide umbrella 3, please refer to... Figure 3 In a preferred embodiment, the sealing blade 41 includes a ring 411, a fixing strap 412, and a blade cloth 413. The ring 411 is connected to the blade cloth 413 by the fixing strap 412. The ring 411 is used for the binding rope 42 to pass through, so as to tighten the blade cloth 413.

[0024] During use, in the assembly standby stage, the fixing strap 412 acts as a rigid connecting carrier, firmly fixing the ring 411 to the preset position of the blade cloth 413, ensuring that the ring 411 is accurately positioned and does not shift. The guide umbrella 3 is gathered and placed in the encapsulated space formed by the blade cloth 413. The binding rope 42 passes through the inner cavity of the ring 411. By tightening the binding rope 42, the ring 411 is moved towards the center, thereby pulling the fixing strap 412 and the blade cloth 413 to tighten synchronously, so that the blade cloth 413 fits tightly against the gathered guide umbrella 3, realizing the wrapping and restraint of the guide umbrella 3, locking the guide umbrella 3 in the ready-to-deploy state, and preventing the guide umbrella 3 from accidentally opening or prematurely inflating during the airdrop.

[0025] During the delayed deployment phase, the cutter 61 receives the trigger signal from the pull cord 62 and performs a delayed action, cutting the binding cord 42 passing through the ring 411. The tightening force of the binding cord 42 on the ring 411 disappears instantly. At this time, the guide umbrella 3 expands outward under the combined action of its own spring force and the impact force of the external airflow. The blade cloth 413 unfolds synchronously after losing its binding force. The ring 411 loosens and shifts with the fixing strap 412. The wrapping and locking state of the sealing blade 41 on the guide umbrella 3 is completely released. The guide umbrella 3 smoothly detaches from the sealing blade 41 and enters the airflow to complete inflation and unfolding, thereby pulling the main umbrella to achieve the subsequent opening action.

[0026] To achieve a detachable connection between the guide parachute 3 and the airdrop carrier 1, please refer to... Figure 6 In a preferred embodiment, the fixing mechanism 5 includes a fixing plate 51 and a screw 52. The fixing plate 51 is provided with a first mounting hole 53, and the sealing blade 41 is provided with a second mounting hole 54. The screw 52 passes through the first mounting hole 53 and the second mounting hole 54, and the screw is threadedly connected to the airdrop carrier.

[0027] In use, the second mounting hole 54 on the sealing blade 41 is precisely aligned with the first mounting hole 53 on the fixing plate 51, so that the fixing plate 51 fits against the fixed force area of ​​the sealing blade 41, forming a double-layered reinforced structure; then the screws 52 are inserted into the first mounting hole 53 and the second mounting hole 54 in sequence, and the end of the screws 52 is screwed into the pre-set threaded hole of the airdrop carrier 1. The axial locking force is generated by the thread engagement, which firmly connects the fixing plate 51, the sealing blade 41 and the airdrop carrier 1 into one, preventing the device from being displaced, loosened or falling off.

[0028] To improve the strength of the connection between the sealing blade 41 and the airdrop carrier 1, please refer to... Figure 4 In a preferred embodiment, the sealing blade 41 further includes a reinforcing strip 414, which is connected to the periphery of the blade cloth 413. The fixing piece 51 abuts against the reinforcing strip 414. The reinforcing strip 414 is provided with a third mounting hole, and the first mounting hole 53, the second mounting hole 54 and the third mounting hole correspond to each other.

[0029] When in use, the reinforcing strap 414 is tightly connected to the periphery of the blade cloth 413 to reinforce the weak parts of the blade cloth 413, effectively dispersing the airflow impact force, falling vibration load and the tightening force of the binding rope 42 during the airdrop process, avoiding problems such as tearing, deformation and warping of the blade cloth 413 due to excessive local stress, and ensuring the reliability of the sealing blade 41 in binding the guide umbrella 3.

[0030] After the cutting mechanism 6 cuts the binding rope 42 after a delay, the sealing blade 41 opens to release the restraint on the guide umbrella 3. The guide umbrella 3 is quickly popped out and inflated under the action of its own spring force and airflow. At this time, the guide umbrella 3 generates an upward aerodynamic lift, which in turn pulls the connecting belt 22 connected to it, so that the connecting belt 22 is gradually straightened and tightened, and the aerodynamic pull is transmitted to the position of the main umbrella pack 21.

[0031] As the lift of the pilot parachute 3 continues to increase, the tension transmitted by the connecting strap 22 exceeds the breaking threshold of the sealing rope 24, and the sealing rope 24 is snapped instantly. The binding force of the fixing rope 23 on the main parachute pack 21 then disappears. After the main parachute pack 21 is unrestrained, it detaches from the airdrop carrier 1 under the pull of the connecting strap 22. The main parachute pack 21 gradually unfolds, and the internal main parachute enters the airflow to inflate and open, finally completing the core action of deceleration and landing.

[0032] To cut the binding rope 42, please refer to... Figure 7 In a preferred embodiment, the cutter 61 includes a housing 7, a trigger 71, a drug head 72, a drug pellet 73, a piston rod 74, a shearing pin 75, a cutter 76, and a retaining ring 77. The trigger 71, the drug head 72, and the drug pellet 73 are sequentially installed inside the housing 7. The pull cord 62 is connected to the trigger 71, the trigger 71 is connected to the drug head 72, and the drug head 72 is connected to the drug pellet 73. The housing 7 has a pressurizing chamber 78 and a guiding chamber 79. The end of the drug pellet 73 away from the drug head 72 faces the pressurizing chamber 78. The pressurizing chamber 78 communicates with the guiding chamber 79. The piston rod 74 is fixedly connected to the guiding chamber 79 by the shearing pin 75. The cutter 76 is connected to the piston rod 74. The cutter 76 maintains a predetermined gap with the binding cord 42. Both retaining rings 77 are connected to the housing 7, and the binding cord 42 passes through the two retaining rings 77 in sequence.

[0033] In use, in the initial assembly state, the trigger 71, the propellant head 72, and the propellant 73 are sequentially and orderly installed in the housing 7, forming a stable ignition and ignition transmission link; the piston rod 74 is positioned and fixed in the guide cavity 79 by the shear pin 75, and is in a locked standby state. The shear pin 75 bears the weight of the piston rod 74 and the slight vibration load, preventing the piston rod 74 from being accidentally displaced, ensuring that the cutter 76 and the binding rope 42 maintain a preset safe gap, and avoiding accidental cutting or rubbing against the binding rope 42; the binding rope 42 passes through the two fixing rings 77 on the housing 7 in sequence to achieve precise positioning, ensuring that the binding rope 42 is always on the cutting path of the cutter 76, preparing for the subsequent cutting action; the pressurization chamber 78 and the guide cavity 79 in the housing 7 are interconnected to form a closed gas pressure transmission channel, and the end of the propellant 73 away from the propellant head 72 is directly opposite the pressurization chamber 78 to ensure efficient gas transmission.

[0034] During the descent and acceleration of the airdropped carrier 1, the pull rope 62 gradually straightens and tightens, and the resulting tension is transmitted to the trigger 71, driving the trigger 71 to act. After the trigger 71 is triggered, it immediately ignites the adjacent propellant head 72, which quickly ignites, produces a stable open flame, and transmits it to the propellant column 73, completing the triggering and ignition action. The entire triggering process is purely mechanically driven, requiring no electrical control power supply, and has strong anti-interference ability and rapid response.

[0035] After the propellant 73 is ignited by the propellant head 72, it burns at a uniform rate according to the preset burning speed. The precise delay is achieved by controlling the formula and length of the propellant 73, thereby controlling the opening sequence of the umbrella. The continuous combustion of the propellant 73 produces a large amount of high-temperature and high-pressure gas, which continuously gathers into the pressurization chamber 78, causing the pressure in the pressurization chamber 78 to gradually increase until the critical working pressure is reached. This stage realizes the core delay function and adapts to the control requirements of different umbrella opening speeds.

[0036] High-pressure gas in the pressurization chamber 78 continuously flows into the connected guide chamber 79, acting on the end of the piston rod 74 and generating an axial thrust on the piston rod 74. When the thrust exceeds the shear strength limit of the shear pin 75, the shear pin 75 breaks instantly, the locking constraint of the piston rod 74 in the guide chamber 79 is released, and it slides rapidly along the axial direction of the guide chamber 79 to achieve the unlocking action.

[0037] The piston rod 74 drives the cutter 76 at the end to move synchronously and quickly. The cutter 76 moves toward the binding rope 42 positioned between the two fixed rings 77. Using the high-speed impact force and the shearing force of the blade, the binding rope 42 is cut off instantly. After the binding rope 42 breaks, the sealing blade 41 releases the restraint on the guide umbrella 3, and the guide umbrella 3 pops out smoothly, completing the entire delayed delivery action.

[0038] To improve the cutting effect, please refer to Figure 7 In a preferred embodiment, the cutter 76 is annular, with the cutting edge of the cutter 76 located on the inner side, and the binding rope 42 passes through the cutter 76.

[0039] In use, the cutter 76 adopts a ring structure with the cutting edge set on the inner side of the ring. The binding rope 42 passes through the inside of the cutter 76, so that the binding rope 42 is constrained in all directions by the ring cutting edge in the radial direction. No matter how the piston rod 74 drives the cutter 76 to move in the axial direction, the binding rope 42 will not deviate from the cutting path, effectively avoiding the problem of missing cuts or incomplete cuts caused by rope swaying or deviation, and ensuring that the cutting action is completed reliably in one go.

[0040] To adjust the delay duration of cutter 61, please refer to... Figure 7 In a preferred embodiment, the cutter 61 further includes an adjustment assembly 8, which includes a sealing plate 81 and a cylinder 82. The sealing plate 81 is slidably connected to the pressurization chamber 78, and the cylinder 82 is installed in the housing 7. The piston rod 74 of the cylinder 82 is connected to the sealing plate 81, and the power of the cylinder 82 is greater than the bearing capacity of the shearing pin 75.

[0041] In use, the sealing plate 81 slides within the pressurization chamber 78 and remains airtight. The cylinder 82 is fixedly mounted on the housing 7, and its piston rod 74 is connected to the sealing plate 81, driving the sealing plate 81 to move axially along the pressurization chamber 78. Initially, the cylinder 82 moves the sealing plate 81 to a set position, determining the effective volume of the pressurization chamber 78. When the delay time needs to be adjusted, the cylinder 82 extends and retracts, causing the sealing plate 81 to slide, increasing or decreasing the effective volume of the pressurization chamber 78, thereby changing the rate of gas pressure rise after combustion of the propellant 73 and achieving fine adjustment of the delay time.

[0042] Since the thrust output by cylinder 82 is greater than the shear bearing capacity of shear pin 75, before the gas pressure is established, cylinder 82 can reliably push the sealing plate 81 to remain in the set position, preventing the sealing plate 81 from being accidentally moved by external forces such as vibration and impact, ensuring the stability of the volume of pressurized chamber 78, and ensuring the accuracy of delay control; when the gas pressure in pressurized chamber 78 rises to a level sufficient to cut shear pin 75, piston rod 74 pushes cutter 76 to complete the cutting action, and sealing plate 81 is still positioned under the action of cylinder 82, without affecting the cutting execution.

[0043] To reduce the impact of temperature fluctuations on the combustion rate of propellant charge 73, please refer to... Figure 7 In a preferred embodiment, the cutter 61 further includes a heat insulation sleeve 9, which is connected to the housing 7 to maintain a stable temperature inside the housing 7.

[0044] During use, by setting an insulation sleeve 9 inside the shell 7, the direct impact of high and low temperatures in the external environment on the internal charge of the shell 7 can be effectively isolated, reducing temperature fluctuations in the working environment of the charge column 73 and the charge head 72, maintaining a relatively stable temperature inside the shell 7, and avoiding problems such as slowed burning rate and longer delay due to low temperature, or excessively fast burning rate and shortened delay due to high temperature.

[0045] To further reduce the impact of temperature fluctuations on the combustion rate of propellant charge 73, please refer to... Figure 8 In a preferred embodiment, the propellant charge 73 includes a main combustion charge 731, a low-temperature combustion-supporting charge 732, and a high-temperature slow-burning charge 733. The main combustion charge 731 is connected inside the housing 7, and a plurality of low-temperature combustion-supporting charges 732 and high-temperature slow-burning charges 733 are spaced apart and connected inside the main combustion charge 731. The low-temperature combustion-supporting charges 732 and the high-temperature slow-burning charges 733 both extend along the length direction of the main combustion charge 731.

[0046] When in use, under low-temperature airdrop conditions, the burning rate of the main combustion column 731 is prone to decrease and slow down, resulting in excessive delay of the cutter 61 and delayed opening of the umbrella. At this time, the low-temperature auxiliary combustion columns 732, which are deployed at intervals, can be quickly ignited, supplementing combustion energy, increasing the overall burning rate of the agent, offsetting the inhibitory effect of low temperature on the combustion rate, and ensuring that the burning time of the propellant column 73 is consistent with the preset value.

[0047] Under high temperature exposure or high-altitude high temperature environment, the main combustion column 731 is prone to excessively fast combustion rate and shortened combustion time, causing the cutter 61 to activate prematurely and the umbrella to open too early. At this time, the high temperature slow combustion column 733 arranged at intervals can release inert slow combustion components to inhibit the excessively fast combustion of the main combustion column 731, stabilize the combustion rate of the agent, prevent the agent column 73 from burning out instantly and the gas pressure from rising sharply, and eliminate the failure of the umbrella canopy and umbrella lines to be damaged by high-speed impact due to excessively short delay time.

[0048] This application also discloses a delayed-deployment parachute, please refer to... Figure 1 It includes a main parachute pack 21, a connecting strap 22, a securing rope 23, and a sealing rope 24. One end of the connecting strap 22 is connected to the pilot parachute 3, and the other end of the connecting strap 22 is connected to the main parachute pack 21. The main parachute pack 21 is placed on the airdrop carrier 1. One end of the multiple securing ropes 23 is connected to the airdrop carrier 1, and the sealing rope 24 passes through the other end of the multiple securing ropes 23 to restrain and lock the main parachute pack 21.

[0049] During use and assembly, the folded main parachute pack 21 is placed stably in the preset installation area of ​​the airdrop carrier 1. Multiple fixing ropes 23 are evenly distributed around the outer perimeter of the main parachute pack 21, with one end securely connected to the airdrop carrier 1, forming a restraining frame around the main parachute pack 21. The sealing rope 24 passes through the ends of the multiple fixing ropes 23 away from the platform in sequence. By tightening the sealing rope 24, the fixing ropes 23 are pulled inward to tighten and enclose the main parachute pack 21, firmly binding and locking it, so that the main parachute pack 21 is in a tight and folded ready-to-deploy state, preventing the main parachute pack 21 from loosening and shifting or prematurely opening during the airdrop process.

[0050] To better understand this invention, the following is combined with... Figure 1 - Figure 8The working principle of a delayed delivery device according to the present invention is described in detail as follows: The delayed delivery device is pre-installed on the airdrop carrier 1. The sealing mechanism 4 wraps the guide umbrella 3 with sealing blades 41, and the binding rope 42 passes through the sealing blades 41 to firmly bind and lock the guide umbrella 3, so that the guide umbrella 3 is in a state of energy storage ready for delivery. The fixing mechanism 5 securely connects the sealing blades 41 to the airdrop carrier 1 to ensure that the device is structurally stable and does not shift during the airdrop process. After the airdrop carrier 1 is separated from the carrier, it falls and accelerates. The pull rope 62 gradually straightens and is subjected to force as the platform moves, which in turn mechanically triggers the cutter 61 to start. After receiving the trigger signal, the cutter 61 enters a delayed standby state. After the preset delay time is reached, it immediately performs the cutting action to cut the binding rope 42. After the binding rope 42 breaks, the binding force of the sealing blade 41 on the guide umbrella 3 disappears, the guide umbrella 3 unlocks and pops out, and enters the airflow to inflate and unfold, and then pulls the main umbrella to complete the opening action; by preset and adjusting the length of the pull rope 62, the triggering timing of the cutter 61 can be controlled. Combined with the dual adjustment of the delay time of the cutter 61 itself, the timing of the unlocking of the guide umbrella 3 and the pulling out of the main umbrella can be precisely controlled, thereby realizing flexible control of the opening speed of the main umbrella.

[0051] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A delayed delivery device, installed on an airdrop carrier, characterized in that, include: Guide umbrella; A sealing mechanism includes sealing blades and binding ropes, wherein the sealing blades are used to seal the guide umbrella, and the binding ropes pass through the sealing blades and secure the guide umbrella. A fixing mechanism, with its fixed end connected to the airdrop carrier and its movable end detachably connected to the sealing blade; and... A cutting mechanism includes a cutter and a pull cord. The cutter is mounted on the binding rope, and the pull cord is connected to the cutter. The pull cord is used to apply force and trigger the cutter to cut the binding rope.

2. The delayed delivery device according to claim 1, characterized in that, The sealing blade includes a ring, a fixing strap, and a blade fabric. The ring is connected to the blade fabric by the fixing strap. The ring is used for binding rope to pass through in order to tighten the blade fabric.

3. The delayed delivery device according to claim 2, characterized in that, The fixing mechanism includes a fixing plate and a screw. The fixing plate has a first mounting hole, and the sealing blade has a second mounting hole. The screw passes through the first mounting hole and the second mounting hole and is threadedly connected to the airdrop carrier.

4. The delayed delivery device according to claim 3, characterized in that, The sealing blade also includes a reinforcing strip connected to the periphery of the blade fabric. The fixing piece abuts against the reinforcing strip. The reinforcing strip is provided with a third mounting hole, and the first mounting hole, the second mounting hole and the third mounting hole correspond to each other.

5. The delayed delivery device according to claim 1, characterized in that, The cutter includes a housing, a trigger, a propellant head, a propellant cartridge, a piston rod, a shearing pin, a cutter, and retaining rings. The trigger, propellant head, and propellant cartridge are sequentially installed inside the housing. The pull cord is connected to the trigger, the trigger is connected to the propellant head, and the propellant head is connected to the propellant cartridge. The housing has a pressurizing chamber and a guiding chamber. The end of the propellant cartridge away from the propellant head faces the pressurizing chamber, and the pressurizing chamber communicates with the guiding chamber. The piston rod is fixedly connected to the guiding chamber by the shearing pin. The cutter is connected to the piston rod, and the cutter maintains a predetermined gap with the binding cord. Both retaining rings are connected to the housing, and the binding cord passes through the two retaining rings sequentially.

6. The delayed delivery device according to claim 5, characterized in that, The cutter is ring-shaped, with the cutting edge located on the inside, and the binding rope passes through the cutter.

7. The delayed delivery device according to claim 5, characterized in that, The cutter also includes an adjustment assembly, which includes a sealing plate and a cylinder. The sealing plate is slidably connected to the pressurization chamber, the cylinder is installed in the housing, and the piston rod of the cylinder is connected to the sealing plate. The power of the cylinder is greater than the load-bearing capacity of the shearing pin.

8. The delayed delivery device according to claim 5, characterized in that, The cutter also includes an insulation sleeve connected inside the housing to maintain a stable temperature inside the housing.

9. The delayed delivery device according to claim 5, characterized in that, The propellant column includes a main combustion column, a low-temperature combustion-supporting column, and a high-temperature slow-burning column. The main combustion column is connected inside the housing. A plurality of low-temperature combustion-supporting columns and high-temperature slow-burning columns are connected at intervals inside the main combustion column. Both the low-temperature combustion-supporting columns and the high-temperature slow-burning columns extend along the length direction of the main combustion column.

10. A delayed-deployment parachute, using a delayed-deployment device as described in any one of claims 1-9, characterized in that, It includes a main parachute pack, connecting straps, securing ropes, and sealing ropes. One end of the connecting strap is connected to the pilot parachute, and the other end of the connecting strap is connected to the main parachute pack. The main parachute pack is placed on the airdrop carrier. One end of each of the securing ropes is connected to the airdrop carrier, and the sealing rope passes through the other end of the securing ropes to secure and lock the main parachute pack.

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