Helicopter side door parachuting system and design method thereof

Abstract

The invention belongs to the field of helicopter special equipment, and particularly relates to a helicopter side door parachute landing system and a design method thereof, and the helicopter side door parachute landing system comprises a parachute opening pull rope device (10), a cabin door blocking device (20), a floor mooring ring (30) and a cabin door mooring ring (40); the parachute opening pull rope device is fixed to a bottom plate in a cabin through a floor mooring ring and used for being connected with a parachute opening structure of a parachute. The cabin door blocking device is installed at the side door through the cabin door mooring ring, located between the first structural frame and the second structural frame and used for being grabbed by parachute landing personnel to avoid accidental falling.

Description

Technical Field

[0001] The invention belongs to the field of helicopter special equipment, and in particular relates to a helicopter side door parachute system and a design method thereof. Background Art

[0002] In various combat scenarios of helicopters, parachuting is an important part of it, which can significantly expand the combat methods of soldiers and enhance their leapfrogging and covert battlefield combat capabilities. At the same time, compared with the problem that large fixed-wing transport aircraft parachuting requires large airports and multiple personnel support, helicopter parachuting can deliver combat personnel to designated areas more accurately, flexibly and covertly, and is especially suitable for various special missions in complex terrains such as forests, plateaus and mountains. With the development of helicopter technology, various series of helicopters have successively added structural layouts for side door entry and exit. With this comes the new demand for side door parachuting.

[0003] However, most of the existing parachute equipment uses the tail door + ceiling steel cable to open the parachute, and there is still a lack of experience in the field of side door parachute opening. In particular, the mandatory parachute opening equipment used for side door parachuting is still blank, which cannot meet the parachute mission execution requirements in the complex combat mission scenarios of the new era. Even if there are a small number of recommended equipment that can meet the side door parachute in a short time, it still cannot meet the rapid design and modification requirements of side door parachute of various types of helicopters. Therefore, it is urgent to design a device that can meet the side door parachute needs of multiple types of helicopters, and propose a method for rapid improvement design based on the overall status of the helicopter, so as to lay a technical foundation for the rapid promotion and use of the side door parachute system on multiple types of helicopters. Summary of the invention

[0004] Purpose of the invention: To provide a helicopter side door parachute system and a design method thereof, which can meet the new era mission requirements of rapid design and modification of side door parachute systems for multiple types of helicopters.

[0005] Technical Solution

[0006] A helicopter side door parachute system, comprising: a parachute opening rope device 10, a cabin door blocking device 20, a floor mooring ring 30, and a cabin door mooring ring 40;

[0007] The parachute opening rope device is fixed to the bottom plate of the cabin through the floor tie-down ring and is used to connect the parachute opening structure;

[0008] The door arresting device is installed at the side door through the door mooring ring and is located between the first structural frame and the second structural frame. It is used for parachutists to grasp to avoid accidental falls.

[0009] Further, the parachute opening rope device 10 includes an adjustment ring 101, a parachute opening rope 102, a parachute opening hanging ring 103 and a floor hook 104;

[0010] The umbrella opening strap 102 passes through all the umbrella opening hanging rings 103 and two adjustment rings 101 in sequence and is then sewn, and four floor hooks 104 pass through the four umbrella opening rings 103 located at the four corners of the umbrella opening strap to fix the umbrella opening strap on the floor;

[0011] The adjustment ring is used to adjust the tightness of the umbrella opening strap.

[0012] Furthermore, the adjustment ring 101 includes a connecting piece 1011, a first arm 1012, a second arm 1013 and a third arm 1014;

[0013] The first arm 1012, the second arm 1013 and the third arm 1014 are vertically connected between the two connecting pieces 1011, and the line connecting the center points thereof forms an obtuse triangle, the vertex angle of which is not less than 150°, and the maximum base angle should be no greater than 15°.

[0014] Furthermore, the door blocking device 20 includes a braided rope and a hook assembly; the two ends of the braided rope are respectively connected to a hook assembly, and the braided rope is hung on the door mooring ring through the hook assembly.

[0015] Further, the hook assembly includes: a door hook 201, a pull head 202, a connecting column 203, a screw 204, a locking bolt 205, a washer 206, a pressure block 207, and a braided rope 208;

[0016] The connecting column 203 is a round tube structure with a protruding middle and straight ends, and four waist-shaped holes are opened on the side wall of the round tube at one end;

[0017] The inner part of the circular tube at one end of the connecting column 203 without the waist-shaped hole is a wedge-shaped structure, and the diameter gradually decreases from the outside to the inside until it becomes the same as the diameter at the other end;

[0018] The locking bolt 205 passes through the center hole of the washer 206 and is tightened with the screw hole set at the center of the axis of the pressing block 207 to form an integral hollow structure;

[0019] The pressing block 207 is a wedge-shaped structure, and its outer surface is provided with 2 to 4 annular grooves, and the groove depth should be 0.3 to 0.5 times the wall thickness;

[0020] The pull head 202 is provided with an internal thread, and the end surface of the connecting column 203 that cooperates with the pull head 202 is provided with an external thread, and the two are matched by threads;

[0021] The outer wall of the pull head 202 is provided with a small through hole perpendicular to the axial direction, and the externally threaded end of the connecting column 203 is provided with a small threaded hole. After the pull head 202 is screwed onto the connecting column 203, the screw 204 is screwed into the anti-loosening threaded hole of the connecting column 203 by passing through the through hole of the outer wall of the pull head 202;

[0022] The braided rope 208 passes through the through hole in the connecting column 203, and the pressing block 207 is pressed on the end face of the rope head of the braided rope 208 and penetrates into the braided rope 208. The pull head 202 and the connecting column 203 are tightened by threads and pressed on the end face of the pressing block 207. The pressing block 207 cooperates with the wedge-shaped tube wall inside the connecting column 203 through its own wedge-shaped structure, so that the braided rope 208 is pressed against the inner side of the tube wall of the connecting column 203, thereby achieving the purpose of connection and assembly.

[0023] A method for designing a helicopter side door parachute system comprises the following steps:

[0024] Step 10: Determine the installation height of the door arresting device according to the parachuting posture of the parachutist. If the parachutist is in a sitting position, the height of the door arresting device from the floor should be 250-350 mm; if the parachutist is in a standing position, the height of the door arresting device from the floor should be 750-900 mm;

[0025] Step 20: Determine the number of parachuting personnel x according to the width Dm of the helicopter sliding door, and the relationship should satisfy x=Dm / 330 rounded down;

[0026] Step 30: Determine the key dimensions of each component of the door arresting device according to the number of parachuting personnel x;

[0027] Step 40: According to the number of parachuting personnel x, the relationship of the number of parachute opening rings y on the parachute opening rope device is determined as follows: y=x+4;

[0028] Step 50: Determine the key dimensions of each component of the parachute pull rope device according to the number of parachuting personnel x;

[0029] Step 60: Determine the installation size of the floor mooring ring according to the number of parachuting personnel x;

[0030] Step 70: According to the number of parachuting personnel x, determine the cross-sectional diameter Dj of the door mooring ring, Dj=0.1x2+0.25x+6 rounded up.

[0031] Further, step 30 includes:

[0032] Step 301: The maximum use length l of the braided rope in the door arresting device and the number x of parachuting personnel satisfy l≥410x+120;

[0033] Step 302: The relationship between the diameter d of the braided rope and the number x of parachutists satisfies d≥34+0.5x;

[0034] Step 303: The relationship between the inner diameter Dn of the hanging ring of the pull head and the number of parachutists x satisfies: Dn≥28+0.5x;

[0035] Step 304: The relationship between the wall thickness m1 of the slider and the number of parachutists x satisfies m1≥2.4+0.25x;

[0036] Step 305: The relationship between the thickness t1 of the slider hanging ring and the number of parachutists x satisfies: 10+0.1x≤t1≤11.5+0.25x;

[0037] Step 306: The connecting column and the pull head are connected by using common metric threads, and the thread direction is right-handed;

[0038] Step 307: The maximum outer diameter Da of the pressing block and the minimum through-hole diameter Db of the connecting column satisfy Da-Db≥0.75.

[0039] Further, step 50 comprises:

[0040] Step 501: After the installation of the parachute rope device, the maximum length Amax and the number of parachutists x satisfy 200x≤Amax≤250x+30:

[0041] Step 502: After the installation of the parachute rope device, the maximum width Bmax and the number of parachutists x satisfy 130x≤Bmax≤150x+20:

[0042] Step 503: The width ak of the parachute strap and the number x of parachutes satisfy 40+0.1x≤ak≤45+0.5x;

[0043] Step 504: The relationship between the thickness bk of the parachute strap and the number of parachuting personnel x satisfies 0.12x≤bk≤0.45x;

[0044] Step 505: The cross-sectional thickness bg of the parachute opening hanging ring should satisfy bg≥8+0.35x;

[0045] Step 506: The cross-sectional diameter Dg of the floor hook and the cross-sectional thickness bg of the umbrella hanging ring satisfy 0≤Dg-bg≤1.25;

[0046] Step 507: The cross-sectional widths az of the first arm 1012 , the second arm 1013 , and the third arm 1014 of the adjusting ring are all ≥10 mm, and the cross-sectional thicknesses bz are all ≥5 mm;

[0047] Step 508: The thickness cz of the connecting arm of the adjustment ring is greater than or equal to 4 mm.

[0048] Further, step 60 includes:

[0049] Step 601: The distance Xk between the floor mooring rings along the heading should satisfy 800+30x≤Xk≤1200+15x;

[0050] Step 602: The vertical heading distance Yk between the floor mooring rings should satisfy 450+60x≤Yk≤600+75x;

[0051] Step 603: The distance Xh between the frontmost floor mooring ring and the first structural frame satisfies 450≤Xh≤500+25x.

[0052] In summary, the present application provides a helicopter side door parachute system and a design method thereof. By setting a door blocking device near the helicopter sliding door, the safety protection of the parachuting personnel under flight conditions is achieved, and the gripping requirements of the parachuting personnel on the aircraft are met, while the physiological and psychological safety requirements are met. By setting a parachute opening rope device on the floor and designing the winding installation and sewing method of the parachute opening rope, the disadvantages of the open loosening of the traditional adjustment rope structure can be effectively avoided, and the safety requirements under the flight state can be met. The parachute opening hanging ring is connected to the parachute opening structure of the parachute to meet the work requirements of forced parachute opening during side door parachuting. In addition, the helicopter side door parachute system and a design method thereof provided by the present application establish a correlation between each component and the number of parachuting personnel and the helicopter cargo compartment structure, which can meet the rapid design requirements of the parachute device at the beginning of the design of similar improved and modified helicopters, and can be extended to other types of helicopters that need to perform side door parachuting tasks, and have strong universality and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of a helicopter side door parachute system is provided for this application;

[0054] Figure 2 A schematic diagram of the composition of a parachute opening rope pulling device is provided for this application;

[0055] Figure 3 A schematic diagram of the composition of the adjustment ring is provided for this application

[0056] Figure 4 A schematic diagram of the composition of the door arresting device is provided for this application;

[0057] Figure 5 A cross-sectional view of the door arresting device during assembly is provided for this application;

[0058] Figure 6 A schematic diagram of the structure and size of the briquette is provided for this application;

[0059] Figure 7 A schematic diagram of the dimensions of the braided rope is provided for this application;

[0060] Figure 8 A schematic diagram of the dimensions of the slider is provided for this application;

[0061] Fig. 9A schematic diagram of the dimensions of the connecting column is provided for this application;

[0062] Fig.10 A schematic diagram of the dimensions of the cross section of the parachute opening strap is provided for this application;

[0063] Fig.11 A schematic diagram of the dimensions of the parachute opening and hanging ring cross section is provided for this application;

[0064] Fig.12 A schematic diagram of the dimensions of the floor hook cross section is provided for this application;

[0065] Fig.13 A schematic diagram of the dimensions of the cross section of the adjustment ring is provided for this application;

[0066] Among them, 10-parachute pull rope device; 20-cabin door blocking device; 30-floor mooring ring; 40-cabin door mooring ring; 50-first structural frame; 60-helicopter cabin door; 70-second structural frame; 101-adjusting ring; 102-parachute pull strap; 103-parachute hanging ring; 104-floor hook; 1011-connecting plate; 1012-first arm; 1013-second arm; 1014-third arm; 201-cabin door hook; 202-pull head; 203-connecting column; 204-screw; 205-locking bolt; 206-washer; 207-pressure block; 208-braided rope. x-number of parachuting personnel; Dm-width of sliding door; y-number of parachute opening rings; Dj-section diameter of door mooring ring; l-maximum usable length of braided rope; d-diameter of braided rope; Dn-inner diameter of the hanging ring of the pull head; m1-wall thickness of the pull head; t1-thickness of the hanging ring of the pull head; Da-maximum outer diameter of the pressure block; Db-minimum through-hole diameter of the connecting column; Amax-maximum length of the parachute opening rope device after installation; Bmax-maximum width of the parachute opening rope device after installation; ak-width of the parachute opening strap; bk-thickness of the parachute opening strap; bg-thickness of the parachute opening ring; Dg-section diameter of the floor hook; az-section width of the adjustment ring support arm; bz-section thickness of the adjustment ring support arm; cz-thickness of the connecting arm; Xk-spacing along the heading between the floor mooring rings; Yk-spacing along the heading between the floor mooring rings; Xh-spacing between the frontmost floor mooring ring and the first structural frame. DETAILED DESCRIPTION

[0067] In a first aspect, the present application provides a helicopter side door parachute system, the helicopter side door parachute system, comprising a parachute pull rope device 10, a door blocking device 20, a floor mooring ring 30, and a door mooring ring 40, wherein:

[0068] The parachute opening rope device 10 comprises an adjustment ring 101 , a parachute opening rope 102 , a parachute opening hanging ring 103 and a floor hook 104 .

[0069] The umbrella opening rope device 10 is sewn after the umbrella opening rope 102 passes through all the umbrella opening hanging rings 103 and two adjustment rings 101 in sequence, and then four floor hooks 104 pass through the four umbrella opening rings 103 located at the four corners of the umbrella opening rope.

[0070] The adjustment ring 101 includes a connecting piece 1011 , a first arm 1012 , a second arm 1013 and a third arm 1014 .

[0071] The first arm 1012, the second arm 1013 and the third arm 1014 are vertically connected between the two connecting pieces 1011, and the line connecting their center points forms an obtuse triangle, the vertex angle of which should be no less than 150°, and the maximum base angle should be no more than 15°.

[0072] The door blocking device 20 includes a door hook 201, a pull head 202, a connecting column 203, a screw 204, a locking bolt 205, a washer 206, a pressure block 207, and a braided rope 208;

[0073] The connecting column 203 is a round tube structure with a protruding middle and straight ends, and four waist-shaped holes are opened on the side wall of the round tube at one end.

[0074] The inner part of the circular tube at one end of the connecting column 203 without the waist-shaped hole is a wedge-shaped structure, and the diameter gradually decreases from the outside to the inside until it becomes the same as the diameter at the other end.

[0075] The locking bolt 205 passes through the center hole of the washer 206 and is tightened with the screw hole set at the center of the axis of the pressing block 207 to form an integral hollow structure.

[0076] The pressing block 207 is a wedge-shaped structure, and 2 to 4 annular grooves are formed on its outer surface, and the depth of the grooves should be 0.3 to 0.5 times of the wall thickness.

[0077] The pull head 202 is provided with an internal thread, and the end surface of the connecting column 203 that cooperates with the pull head 202 is provided with an external thread, and the two are matched by threads.

[0078] The outer wall of the pull head 202 is provided with a small through hole perpendicular to the axis, and the externally threaded end of the connecting column 203 is provided with a small threaded hole. After the pull head 202 is screwed onto the connecting column 203, the screw 204 can be screwed into the anti-loosening threaded hole of the connecting column 203 by passing through the through hole on the outer wall of the pull head 202.

[0079] The braided rope 208 passes through the through hole in the connecting column 203, and the pressing block 207 is pressed on the end face of the rope head of the braided rope 208 and penetrates into the braided rope 208. The pull head 202 and the connecting column 203 are tightened by threads and pressed on the end face of the pressing block 207. The pressing block 207 cooperates with the wedge-shaped tube wall inside the connecting column 203 through its own wedge-shaped structure, so that the braided rope 208 is pressed against the inner side of the tube wall of the connecting column 203, thereby achieving the purpose of connection and assembly.

[0080] The floor tie-down ring 30 is arranged in the center of the helicopter cargo compartment floor.

[0081] The door mooring ring 40 is arranged on the first structure frame 50 and the second structure frame 70 at both ends of the helicopter door 60 .

[0082] The cross-sections of the first structural frame 50 and the second structural frame 70 are I-beam structures, and the hatch mooring ring 40 is installed on the I-beam flanges of the first structural frame 50 and the second structural frame 70 by bolts.

[0083] Specifically, when sewing the parachute opening strap 102, the two adjustment rings 101 need to be placed horizontally side by side, and one end of the parachute opening strap 102 is passed from bottom to top through the gap between the first arm 1012 and the second arm 1013 of the first adjustment ring 101, and then passed from top to bottom through the gap between the second arm 1013 and the third arm 1014, and then continue to pass the parachute opening strap 102 from top to bottom through the gap between the first arm 1012 and the second arm 1013 of the second adjustment ring 101, and then pass back from bottom to top through the gap between the first arm 1012 and the second arm 1013 of the first adjustment ring 101, and then pass from top to bottom through the gap between the second arm 1013 and the third arm 1014, and finally the passed part is sewn with reference to the standard HB5879.1-1985 "Three-point fork stitching of thick belt creases in the parachute stitching part".

[0084] Specifically, the braided rope 208 is a polyimide braided rope. When assembled with the connecting column 203, the inserted part needs to be broken up into filaments, and then the pressing block 207 constituting the whole is inserted into one end of the connecting column 203 with a waist-shaped hole, and manually adjusted to make the broken silk threads evenly arranged around the pressing block 207, and the part where the braided rope 208 is connected to the connecting column 203 is infiltrated with rubber adhesive.

[0085] In a second aspect, the present application provides a method for designing a helicopter side door parachute system, the method comprising:

[0086] Step 10: Determine the parachuting posture of the parachutist according to the height of the cabin door. If the parachutist is in a sitting position, the height of the cabin door blocking device 20 from the floor should be 250-350 mm. If the parachutist is in a standing position, the height of the cabin door blocking device 20 from the floor should be 750-900 mm.

[0087] Step 20: Determine the number x of parachuting personnel based on the width Dm of the helicopter sliding door, and the relationship should satisfy x=Dm / 330 rounded down.

[0088] Step 30: Determine the key dimensions of each component of the door arresting device 20 according to the number of parachuting personnel x;

[0089] Step 40: According to the number x of parachuting personnel, the number y of parachute hanging rings 103 on the parachute pulling rope device 10 is determined as follows: y=x+4.

[0090] Step 50: Determine the key dimensions of each component of the parachute pull rope device 10 according to the number of parachutists x.

[0091] Step 60: Determine the installation size of the floor mooring ring 30 according to the number x of parachuting personnel.

[0092] Step 70: According to the number of parachuting personnel x, determine that the cross-sectional diameter Dj of the door mooring ring 40 should satisfy: Dj = 0.1x 2 +0.25x+6 is the value rounded up.

[0093] Specifically, step 30 includes:

[0094] Step 301: The maximum usable length l of the braided rope 208 in the door arresting device 20 and the number x of parachuting personnel should satisfy l≥410x+120.

[0095] Step 302: The relationship between the diameter d of the braided rope 208 and the number x of parachutists should satisfy d≥34+0.5x.

[0096] Step 303: The relationship between the inner diameter Dn of the hanging ring of the pull head 202 and the number x of parachutists should satisfy Dn≥28+0.5x;

[0097] Step 304: The relationship between the wall thickness m1 of the slider 202 and the number of parachutists x should satisfy m1≥2.4+0.25x;

[0098] Step 305: The relationship between the thickness t1 of the hanging ring of the pull head 202 and the number x of parachuting personnel should satisfy 10+0.1x≤t1≤11.5+0.25x;

[0099] Step 306: The connecting column 203 and the pull head 202 are connected by using common metric threads, and the thread direction is right-handed;

[0100] Step 307 : The maximum outer diameter Da of the pressing block 207 and the minimum through-hole diameter Db of the connecting column 203 should satisfy Da-Db≥0.75.

[0101] Specifically, step 50 includes:

[0102] Step 501: After the installation of the parachute rope device 10, the maximum length Amax and the number of parachutists x should satisfy 200x≤Amax≤250x+30:

[0103] Step 502: After the installation of the parachute rope device 10, the maximum width Bmax and the number of parachutists x should satisfy 130x≤Bmax≤150x+20:

[0104] Step 503: The width ak of the parachute strap 102 and the number x of parachuting personnel should satisfy 40+0.1x≤ak≤45+0.5x;

[0105] Step 504: The relationship between the thickness bk of the parachute strap 102 and the number of parachuting personnel x should satisfy 0.12x≤bk≤0.45x;

[0106] Step 505: the cross-sectional thickness bg of the parachute opening hanging ring 103 should satisfy bg≥8+0.35x;

[0107] Step 506: The cross-sectional diameter Dg of the floor hook 104 and the cross-sectional thickness bg of the umbrella hanging ring 103 should satisfy 0≤Dg-bg≤1.25;

[0108] Step 507: The cross-sectional widths az of the first arm 1012 , the second arm 1013 , and the third arm 1014 of the adjusting ring 101 should all be ≥10 mm, and the cross-sectional thicknesses bz should all be ≥5 mm;

[0109] Step 508: The thickness cz of the connecting arm of the adjusting ring 101 should satisfy cz greater than or equal to 4 mm;

[0110] Specifically, step 60 includes:

[0111] Step 601: The distance Xk between the floor mooring rings 40 along the heading should satisfy 800+30x≤Xk≤1200+15x

[0112] Step 602: The vertical heading distance Yk between the floor mooring rings 40 should satisfy 450+60x≤Yk≤600+75x

[0113] Step 603: The distance Xh between the frontmost floor mooring ring and the first structural frame 50 should satisfy 450≤Xh≤500+25x.

Claims

1. A helicopter side door parachute system, characterized by: include: A parachute opening rope device (10), a door blocking device (20), a floor mooring ring (30), and a door mooring ring (40); The parachute opening rope device is fixed to the bottom plate of the cabin through the floor tie-down ring and is used to connect the parachute opening structure; The door arresting device is installed at the side door through the door mooring ring and is located between the first structural frame and the second structural frame. It is used for parachutists to grasp to avoid accidental falls.

2. The system according to claim 1, characterized in that: The parachute opening rope device (10) comprises an adjustment ring (101), a parachute opening rope (102), a parachute opening hanging ring (103) and a floor hook (104); The umbrella opening strap (102) is sequentially passed through all the umbrella opening hanging rings (103) and two adjustment rings (101) and then sewn, and four floor hooks (104) are passed through four umbrella opening pull rings (103) located at the four corners of the umbrella opening strap to fix the umbrella opening strap on the floor; The adjustment ring is used to adjust the tightness of the umbrella opening strap.

3. The system according to claim 2, characterized in that: The adjustment ring (101) comprises a connecting piece (1011), a first arm (1012), a second arm (1013) and a third arm (1014); The first arm (1012), the second arm (1013) and the third arm (1014) are vertically connected between the two connecting plates (1011), and the line connecting their center points forms an obtuse triangle, the vertex angle of which is not less than 150°, and the maximum base angle should not be greater than 15°.

4. The system according to claim 1, characterized in that: The hatch blocking device (20) comprises a braided rope and a hook assembly; the two ends of the braided rope are respectively connected to a hook assembly, and the braided rope is hung on the hatch mooring ring through the hook assembly.

5. The system according to claim 4, characterized in that: The hook assembly comprises: a door hook (201), a pull head (202), a connecting column (203), a screw (204), a locking bolt (205), a washer (206), a pressure block (207), and a braided rope (208); The connecting column (203) is a circular tube structure with a protruding middle and straight ends, and four waist-shaped holes are opened on the side wall of the circular tube at one end; The inner part of the circular tube at one end of the connecting column (203) without the waist-shaped hole is a wedge-shaped structure, and the diameter gradually decreases from the outside to the inside until it becomes the same as the diameter at the other end; The locking bolt (205) passes through the center hole of the washer (206) and is tightened with the screw hole arranged at the center of the axis of the pressing block (207) to form an integral hollow structure; The pressing block (207) is a wedge-shaped structure, and its outer surface is provided with 2 to 4 annular grooves, and the groove depth should be 0.3 to 0.5 times the wall thickness; The pull head (202) is provided with an internal thread inside, and the end surface of the connecting column (203) that matches with the pull head (202) is provided with an external thread, and the two are matched by the thread; The outer wall of the pull head (202) is provided with a small through hole perpendicular to the axis, and the externally threaded end of the connecting column (203) is provided with a small threaded hole. After the pull head (202) is screwed onto the connecting column (203), the screw (204) is passed through the through hole on the outer wall of the pull head (202) and screwed onto the anti-loosening threaded hole of the connecting column (203); The braided rope (208) passes through the through hole in the connecting column (203), and the pressing block (207) is pressed on the end face of the rope head of the braided rope (208) and penetrates into the braided rope (208). The pull head (202) and the connecting column (203) are tightened by threads and pressed on the end face of the pressing block (207). The pressing block (207) cooperates with the wedge-shaped tube wall inside the connecting column (203) through its own wedge-shaped structure, so that the braided rope (208) is pressed against the inner side of the tube wall of the connecting column (203), thereby achieving the purpose of connection and assembly.

6. A method for designing a helicopter side door parachute system, used to design any of the above-mentioned systems, characterized in that: The following steps are involved: Step 10: Determine the installation height of the door arresting device according to the parachuting posture of the parachutist. If the parachutist is in a sitting position, the height of the door arresting device from the floor should be 250-350 mm; if the parachutist is in a standing position, the height of the door arresting device from the floor should be 750-900 mm; Step 20: Determine the number of parachuting personnel x according to the width Dm of the helicopter sliding door, and the relationship should satisfy x=Dm / 330 rounded down; Step 30: Determine the key dimensions of each component of the door arresting device according to the number of parachuting personnel x; Step 40: According to the number of parachuting personnel x, the relationship of the number of parachute opening rings y on the parachute opening rope device is determined as follows: y=x+4; Step 50: Determine the key dimensions of each component of the parachute pull rope device according to the number of parachuting personnel x; Step 60: Determine the installation size of the floor mooring ring according to the number of parachuting personnel x; Step 70: According to the number of parachuting personnel x, determine the cross-sectional diameter Dj of the door mooring ring, Dj=0.1x2+0.25x+6 rounded up.

7. The method according to claim 6, characterized in that: Step 30 includes: Step 301: The maximum use length l of the braided rope in the door arresting device and the number x of parachuting personnel satisfy l≥410x+120; Step 302: The relationship between the diameter d of the braided rope and the number x of parachutists satisfies d≥34+0.5x; Step 303: The relationship between the inner diameter Dn of the hanging ring of the pull head and the number of parachutists x satisfies: Dn≥28+0.5x; Step 304: The relationship between the wall thickness m1 of the slider and the number of parachutists x satisfies m1≥2.4+0.25x; Step 305: The relationship between the thickness t1 of the slider hanging ring and the number of parachutists x satisfies: 10+0.1x≤t1≤11.5+0.25x; Step 306: The connecting column and the pull head are connected by using common metric threads, and the thread direction is right-handed; Step 307: The maximum outer diameter Da of the pressing block and the minimum through-hole diameter Db of the connecting column satisfy Da-Db≥0.

75.

8. The method according to claim 7, characterized in that: Step 50 includes: Step 501: After the installation of the parachute rope device, the maximum length Amax and the number of parachutists x satisfy 200x≤Amax≤250x+30: Step 502: After the installation of the parachute rope device, the maximum width Bmax and the number of parachutists x satisfy 130x≤Bmax≤150x+20: Step 503: The width ak of the parachute strap and the number x of parachutes satisfy 40+0.1x≤ak≤45+0.5x; Step 504: The relationship between the thickness bk of the parachute strap and the number of parachuting personnel x satisfies 0.12x≤bk≤0.45x; Step 505: The cross-sectional thickness bg of the parachute opening hanging ring should satisfy bg≥8+0.35x; Step 506: The cross-sectional diameter Dg of the floor hook and the cross-sectional thickness bg of the umbrella hanging ring satisfy 0≤Dg-bg≤1.25; Step 507: The cross-sectional widths az of the first arm 1012 , the second arm 1013 , and the third arm 1014 of the adjusting ring are all ≥10 mm, and the cross-sectional thicknesses bz are all ≥5 mm; Step 508: The thickness cz of the connecting arm of the adjustment ring is greater than or equal to 4 mm.

9. The method according to claim 8, characterized in that: Step 60 includes: Step 601: The distance Xk between the floor mooring rings along the heading should satisfy 800+30x≤Xk≤1200+15x; Step 602: The vertical heading distance Yk between the floor mooring rings should satisfy 450+60x≤Yk≤600+75x; Step 603: The distance Xh between the frontmost floor mooring ring and the first structural frame satisfies 450≤Xh≤500+25x.

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