Linkage opening and closing method and device for high-altitude umbrella body

Abstract

The invention relates to the field of high-altitude wind energy, in particular to a linkage opening and closing method and device for a high-altitude umbrella body, and the method comprises the change states of complete opening, pre-closing, complete closing and pre-opening of the umbrella body. The device comprises a track cable, a pulley block, a parachute body, a connecting rope, a driver and a rope winder. The problems that parts of a driver are damaged due to instant pulling force generated when an umbrella body is opened and closed, the power generation income of the high-altitude umbrella body is reduced due to the fact that the number of axial walking type drivers is too large, and the umbrella body cannot reach the ideal opening and closing state due to the fact that the axial walking type drivers are removed are solved. Ideal opening and closing of the umbrella body are achieved through an integral linkage opening and closing method that the inner umbrella cloth drives the outer umbrella cloth through the overlapping fixing part by changing the tightness state of different umbrella ropes and controlling the wind action on different umbrella cloth areas through the connecting ropes. And through cooperation of the drivers and the pulley blocks, the number of the axial walking type drivers is reduced, energy supply equipment of the umbrella body is reduced, and consumption of power generation benefits of the umbrella body is avoided.

Description

Technical Field

[0001] The present invention relates to the field of high-altitude wind energy, and more particularly to a method and device for linking the opening and closing of a high-altitude parachute. Background Art

[0002] In high-altitude wind power generation applications, parachutes continuously harvest wind energy at high altitudes, using it to drive generators for electricity generation. Key research areas for this wind power generation solution are extending the parachute's service life at high altitudes, ensuring safe and responsive recovery, while also minimizing energy consumption during the opening and closing process. Reducing energy consumption during opening and closing at high altitudes, particularly to prevent it from offsetting power generation gains and significantly improving the parachute's power generation efficiency, is a key research area in this field.

[0003] Chinese invention patent application number 201611246832.7 discloses a dual-drive umbrella-type wind energy conversion device and its opening and closing method, comprising: a track cable; a stopper fixed to the track cable; a parasol with its top center sleeved on the track cable; and two actuators sleeved on the track cable and capable of reciprocating on the track cable, including: a first actuator connected to the top center of the parasol; a second actuator located between the stopper and the first actuator; the second actuator connected to the parasol via a line connected to the edge of the parasol; and a locking mechanism for locking the second actuator and the stopper on the second actuator and / or the stopper. In this device structure, the first and second actuators are two axially traveling actuators, one of which is fixed to the line and the other to the parasol fabric. The opening and closing of the line and the parasol fabric is regulated by controlling the distance between the first and second actuators. This significantly increases the energy consumption of the two axially traveling actuators during the opening and closing of the parasol, which is detrimental to the power generation benefits of the parasol. At the same time, the device structure of this solution also has the problem that when the parachute is opened or closed, the instantaneous force generated by the tension acceleration may cause damage to the drive components, motor, parachute or track cables.

[0004] To overcome the energy consumption of the two axially traveling actuators and the potential damage to actuator components, the motor, the parachute, or the track cables caused by the instantaneous force generated by tension acceleration during parachute opening and closing, the aforementioned axially traveling actuators attached to the lines and the parachute fabric are replaced with a single axially traveling actuator that adjusts the opening and closing of the lines and fabric by controlling the size of the parachute's central hole, placing a pulley block at the bottom of the center hole, and positioning a single axially traveling actuator between the center hole and the pulley block. However, this solution can easily result in the parachute not reaching the ideal state during the opening process.

[0005] How to reduce the number of axial travel drives without affecting the opening and closing state of the parachute body, and how to ensure that the parachute body can operate gently and smoothly in the opening or closing state, is an urgent problem to be solved in this field. Summary of the Invention

[0006] The present invention aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide a method and device for the coordinated opening and closing of a high-altitude parachute, which is used to solve the problem that the instantaneous tension generated by acceleration when the parachute is opened or closed may cause damage to the drive components, motor or track cables, and to solve the problem that the power generation income of the high-altitude parachute is reduced due to too many axial travel drives, and replacing two axial travel drives will cause the parachute to fail to achieve the ideal opening and closing state.

[0007] The technical solution adopted by the present invention is to provide a high-altitude parachute linkage opening and closing method, the high-altitude parachute comprising: Track cable, parachute rope, outer parachute cloth and inner parachute cloth sleeved on the track cable at the top center, and connecting rope for connecting the inner parachute cloth and track cable; The outer umbrella cloth includes an outer edge fixing point A1, a middle fixing point A2, and an inner edge fixing point A3. The inner umbrella cloth includes an outer edge fixing point B1, a middle fixing point, and an inner edge fixing point B2. The inner edge fixing point A3 of the outer umbrella cloth overlaps and is fixed correspondingly with the middle fixing point of the inner umbrella cloth. The outer edge fixing point B1 of the inner umbrella cloth overlaps and is fixed correspondingly with the middle fixing point A2 of the outer umbrella cloth. The parachute lines include an outer parachute line connected to A1 and an inner parachute line connected to B1; One end of the connecting rope is connected to B2, and the other end is movably connected to the track cable through a rope reel. The outer umbrella cloth is located between the outer umbrella rope and the inner umbrella rope, and the inner umbrella cloth is located between the inner umbrella rope and the connecting rope; The linked opening and closing methods include: When the wing is fully expanded: The inner parachute cloth B2 is in a central closed state toward the track cable by the winding of the connecting rope; the outer parachute rope and the inner parachute rope are tightened, and the outer and inner parachute cloths are bulged by the wind; When the wing is ready to close: The inner umbrella cloth B2 is in a hollow expansion state in the direction away from the track cable by unwinding the connecting rope; the inner umbrella rope is tightened, and the inner umbrella cloth flips upward to form a folding surface with B1 at the bottom and B2 at the top; the outer umbrella cloth forms a stacking surface with A1 moving closer to A2 and A3; When the wing is fully closed: The inner umbrella cloth B2 is in a central open state away from the track cable by unwinding the connecting rope; the outer umbrella rope and the connecting rope are relaxed, the inner umbrella cloth is in a straight cylindrical state with B1 at the bottom and B2 at the top and is folded close to the track cable, and the outer umbrella cloth is completely turned outward to form an outward turned surface with A1 at the top and A3 at the bottom and is folded close to the track cable; When the wing is ready to open: The B2 of the inner parachute cloth is in a hollow and retracted state toward the track cable through the winding of the connecting rope; the outer parachute rope is gradually tightened, and the inner parachute cloth gradually bulges under the action of wind, driving the outer parachute cloth to gradually bulge under the action of wind.

[0008] By changing the tightness of the parachute ropes and controlling the wind force on different areas of the parachute cloth through the connecting ropes, the parachute cloth can be opened and closed in a coordinated manner through the areas driving the entire parachute to achieve ideal opening and closing of the parachute. At the same time, it also reduces the energy supply equipment in the parachute body and avoids consuming the power generation income of the parachute body.

[0009] Furthermore, the track cable includes setting points P1, P2 and limit points P4, P5. The track cable is provided with a driver that moves between P1 and P2 and a rope reel that moves between P4 and P5. The driver is connected to the outer parachute rope and the inner parachute rope at the same time, and the rope reel is connected to the connecting rope. A pulley block is provided on the track cable below the driver, and the outer parachute rope is connected to the driver around the pulley block. The cycle steps of the outer parachute cloth and the inner parachute cloth from opening to closing to opening include: S1. The driver is located at the set point P1, the rope reel is located at the limit point P4, the outer and inner umbrella cloths form a convex surface in the cross-sectional direction to form a semicircle, P4 is located at the vertex of the semicircle; S2. The drive moves downward, the reel moves downward and unwinds the connecting rope, driving the inner umbrella cloth to form a folded surface, and the inner umbrella cloth drives the outer umbrella cloth to form a stacked surface; S3. The driver is located at the set point P2, the rope reel is located at the limit point P5, the inner umbrella cloth B1, A3 and B2 form a straight surface, the outer umbrella cloth A1, A2 and A3 form an outward turning surface; S4. The driver moves upward, the rope reel moves upward and reels the connecting rope, driving the inner umbrella cloth to gradually form a convex surface, and the inner umbrella cloth drives the outer umbrella cloth to gradually form a convex surface.

[0010] An axial travel drive is used to ensure the ideal opening and closing state of the parachute. The cooperation between the drive and the pulley set provides power for the cyclic opening and closing steps of the specific changing state of the parachute, and reduces the loss of power generation income of the parachute through the opening and closing steps.

[0011] Furthermore, step S1 specifically includes: S11. The drive stops at the set point P1, the outer parachute rope is tightened and expanded by the wind at point A1, and the angle between the outer parachute rope and the track cable is maintained at a maximum; S12. The rope reel is wound and stopped at the limit point P4. The inner parachute rope is tightened and expanded outwards at point B1 by the wind force. The angle between the inner parachute rope and the track cable is kept at the maximum. The connecting rope (10) is tightened, and the inner parachute cloth (7) forms a central closed state at point B2.

[0012] By fixing the driver and limiting the rope reel, the forces on the outer and inner parachute cloths no longer change, thereby continuously and smoothly operating the parachute body in a fully opened state.

[0013] Furthermore, step S2 specifically includes: S21. The reel goes down and unwinds the connecting rope, so that the inner parachute cloth forms a hollow expansion state in B2; S22. The outer umbrella rope is gradually stretched on the A1 side by the downward action of the driver, and the A1 of the outer umbrella cloth moves toward the direction close to the track cable, so that the continuous convex surface formed by A1, A2, and A3 of the outer umbrella cloth (6) gradually forms a stacked surface with A1 on the outside and A2 and A3 on the inside, and A2 and A3 of the outer umbrella cloth (6) move downward, so that the outer umbrella cloth (6) forms an inner folded surface with A2 on the bottom and A3 on the top; S23. The inner parachute rope is driven downward by the driver, and the inner parachute cloth B1 is driven downward by the driver, forming a straight cylindrical surface with B1 at the bottom and B2 at the top.

[0014] By controlling the movement of the driver and the synchronous movement and retraction and unreeling of the rope reel, the length changes of the outer rope, inner rope and connecting rope as well as the angle changes between them and the track cable are controlled, thereby achieving a smooth transition of the parachute from the fully open state to the ready-to-close state.

[0015] Furthermore, step S3 specifically includes: S31. The drive stops at the set point P2, the outer parachute line is relaxed and turned outward by the wind at point A1, and the angle between the outer parachute line and the track cable is kept minimum; S32. The rope reel unwinds and stops at the limit point P5. The inner parachute rope relaxes and retracts inwards at point B1 under the action of tension. The angle between the inner parachute rope and the track cable remains minimum. The connecting rope (10) is loosened, and the inner parachute cloth (7) forms a central opening state at point B2.

[0016] By fixing the driver and limiting the rope reel, the forces on the outer and inner parachute cloths no longer change, thereby continuously and smoothly operating the parachute body in a fully closed state.

[0017] Furthermore, step S4 specifically includes: S41. The rope reel goes up and reels in the connecting rope, so that the inner umbrella cloth forms a hollow collapsed state in B2; S42. The outer parachute rope is gradually shortened on the A1 side by the upward action of the driver, and the A1 of the outer parachute cloth moves in the direction away from the track cable, so that the continuous outward turning surface formed by A1, A2, and A3 of the outer parachute cloth (6) gradually forms a stacked surface with A1 outside and A2 and A3 inside. A2 and A3 of the outer parachute cloth (6) move upward, so that the outer parachute cloth (6) forms an outward-extending surface with A2 at the bottom and A3 at the top; S43. The inner parachute rope is moved upward by the driver, and the inner parachute cloth B1 is moved upward by the wind, forming an unfolded surface with B1 at the bottom and B2 at the top. By controlling the movement of the driver and the synchronous movement and retraction and unwinding of the rope reel, the length changes of the outer rope, inner rope and connecting rope, as well as the angle changes between them and the track cable, a smooth transition of the parachute body from a fully closed state to a ready-to-open state is achieved.

[0018] Furthermore, the radius of the inner umbrella cloth is Ra2, the radius of the central opening formed by the inner umbrella cloth and the track cable at point B2 is Ra3, and 1 / 2Ra2≤Ra3≤3 / 4Ra2.

[0019] By adjusting the ratio of the center hole in the inner umbrella cloth to the radius of the inner umbrella cloth, the inner umbrella cloth can be kept stably in a hollow contracted or hollow expanded state, thereby improving the opening and closing efficiency of the umbrella body and reducing energy consumption.

[0020] Preferably, a high-altitude parachute linkage opening and closing device is also provided, comprising the high-altitude parachute linkage opening and closing method, which further comprises: Track cables; Pulley block, fixed to the track cable; The parachute body, which is sleeved on the track cable at the top center, includes an outer parachute cloth, an inner parachute cloth, an outer parachute rope, and an inner parachute rope. The outer parachute cloth and the inner parachute cloth are connected as a whole through the reserved binding points A2 and A3. One end of the outer parachute rope is connected to the A1 point of the outer parachute cloth, and the other end is connected to the driver by winding around the pulley block across both sides of the outer parachute cloth. One end of the inner parachute rope is connected to the B1 point of the inner parachute cloth, and the other end is connected to the driver. A connecting rope, one end of which is connected to the inner side of the inner parachute cloth, and the other end is movably connected to the track cable; a driver, which moves on the track cable and is located between the setting point P1 and the setting point P2, is connected to the outer parachute line and the inner parachute line, and drives the outer parachute line and the inner parachute line relative to the track cable; The rope reel moves on the track cable and is located between the limit point P4 and the limit point P5, is connected to the connecting rope, and reels or unreels the connecting rope relative to the opening size of the inner umbrella cloth.

[0021] By partially overlapping the inner and outer umbrella cloths on the umbrella body, a method of locally driving the entire umbrella body linkage is realized, thereby reducing energy consumption; the driver provides power for the tightness of the outer and inner umbrella ropes, and the rope reel drives the movement of the connecting rope and controls the winding or unwinding of the connecting rope, thereby coordinating the joint action of the connecting rope on the outer and inner umbrella ropes, and then controlling the state change of the outer or inner umbrella cloth; the pulley block and the driver cooperate to realize the length adjustment of the outer umbrella rope on both sides of the pulley block, thereby directly adjusting the distance between the outer umbrella cloth and the pulley block, reducing the possibility of installing other energy-consuming devices on the outer umbrella cloth.

[0022] Furthermore, it also includes a locking device, which is arranged at the pulley block. When the driver stops at the setting point P1 or the setting point P2, the driver is locked with the locking device, and when the driver moves up or down, the driver is unlocked with the locking device.

[0023] The locking device is used to lock and release the driver, preventing the driver from moving on the track cable due to wind force, thereby preventing the parachute from being stable in a fully opened or fully closed state.

[0024] Furthermore, the radius of the outer umbrella cloth is Ra1, the radius of the inner umbrella cloth is Ra2, 1 / 2Ra1≤Ra2≤5 / 8Ra1, the length of the outer umbrella rope ranges from 3.42Ra1 to 3.73Ra1, and the length of the inner umbrella rope is 2Ra2.

[0025] Through the specific numerical ratio of the radius of the outer umbrella rope and the outer umbrella cloth, as well as the specific numerical ratio of the radius of the inner umbrella rope and the inner umbrella cloth, the opening of the outer umbrella cloth and the inner umbrella cloth is ideal.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: by changing the tightness of the outer and inner umbrella ropes and controlling the wind force on the inner and outer umbrella cloth areas with the connecting ropes, the inner umbrella cloth drives the outer umbrella cloth to open and close in an overall linkage manner through the overlapping fixed parts to achieve ideal opening and closing of the umbrella body; by cooperating with the drive and the pulley group, the number of axial walking drives in the umbrella body is reduced to one, thereby reducing the energy supply equipment in the umbrella body and avoiding consuming the power generation income of the umbrella body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a diagram showing the installation structure of the umbrella body, driver, and rope reel of the present invention.

[0028] Figure 2 It is a plan view of the outer umbrella cloth of the present invention.

[0029] Figure 3 It is an axial schematic diagram of the inner umbrella cloth of the present invention.

[0030] Figure 4This is a schematic diagram of the umbrella body of the present invention being fully opened.

[0031] Figure 5 This is a schematic diagram of the umbrella body of the present invention being ready for closure.

[0032] Figure 6 It is a schematic diagram of the umbrella body during closing process of the present invention.

[0033] Figure 7 It is a schematic diagram of the umbrella body of the present invention being completely closed.

[0034] Figure 8 This is a schematic diagram of the umbrella body of the present invention being ready to be opened. DETAILED DESCRIPTION

[0035] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting the present invention. To better illustrate the following embodiments, some components in the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will appreciate that some well-known structures and their descriptions may be omitted from the accompanying drawings.

[0036] Example 1 like Figure 1-8 As shown, this embodiment provides a method for linking the opening and closing of a high-altitude parachute, the high-altitude parachute comprising: Track cable 11, parachute rope, outer umbrella cloth 6 and inner umbrella cloth 7 sleeved on the track cable 11 at the top center, and connecting rope 10 for connecting the inner umbrella cloth 7 and track cable 11; The outer umbrella cloth 6 includes an outer edge fixing point A1, an intermediate fixing point A2, and an inner edge fixing point A3. The inner umbrella cloth 7 includes an outer edge fixing point B1, an intermediate fixing point, and an inner edge fixing point B2. The inner edge fixing point A3 of the outer umbrella cloth 6 overlaps and is fixed correspondingly with the intermediate fixing point of the inner umbrella cloth 7. The outer edge fixing point B1 of the inner umbrella cloth 7 overlaps and is fixed correspondingly with the intermediate fixing point A2 of the outer umbrella cloth 6. The parachute cord includes an outer parachute cord 8 connected to A1 and an inner parachute cord 9 connected to B1. One end of the connecting rope 10 is connected to B2, and the other end is movably connected to the track cable 11 through the rope reel 3. The outer umbrella cloth 6 is located between the outer parachute cord 8 and the inner parachute cord 9, and the inner umbrella cloth 7 is located between the inner parachute cord 9 and the connecting rope 10. The linked opening and closing methods include: When the wing is fully expanded: The inner umbrella cloth 7 is in a central closed state by the winding of the connecting rope 10 toward the track cable 11; the outer umbrella rope 8 and the inner umbrella rope 9 are tightened, and the outer umbrella cloth 6 and the inner umbrella cloth 7 are both raised by the wind; When the wing is ready to close: The inner umbrella cloth 7 B2 is in a hollow expansion state in the direction away from the track cable 11 by unwinding the connecting rope 10; the inner umbrella rope 9 is tightened, and the inner umbrella cloth 7 is turned upward to form a folded surface with B1 at the bottom and B2 at the top; the outer umbrella cloth 6 forms a stacked surface with A1 close to A2 and A3; When the wing is fully closed: The inner umbrella cloth 7 is in a centrally open state with B2 being unwound from the connecting rope 10 in a direction away from the track cable 11; the outer umbrella rope 8 and the connecting rope 10 are relaxed, the inner umbrella cloth 7 is in a straight cylindrical state with B1 at the bottom and B2 at the top and is folded close to the track cable (11), and the outer umbrella cloth (6) is completely turned outward to form an outward-turned surface with A1 at the top and A3 at the bottom and is folded close to the track cable 11; When the wing is ready to open: The B2 of the inner umbrella cloth 7 is in a hollow and retracted state toward the track cable 11 by the winding of the connecting rope 10; the outer umbrella rope 8 is gradually tightened, and the inner umbrella cloth 7 is gradually convex under the action of wind force, driving the outer umbrella cloth 6 to gradually convex under the action of wind force.

[0037] In this embodiment, the outer umbrella fabric 6 is in the shape of a truncated hemisphere with an open top, appearing annular when viewed from above. The framework of the outer umbrella fabric 6 divides the annular ring into three concentric circles: the outermost circle is formed by a circle of fixed points A1, the innermost circle is formed by a circle of fixed points A3, and the middle circle is formed by a circle of fixed points A2. The inner umbrella fabric 7 comprises a truncated spherical surface and a deformable surface. The deformable surface can be folded to form a vertical surface or collapsed to form a conical surface. As the deformable surface of the inner umbrella fabric 7 deforms, the diameter of the central hole of the inner umbrella fabric 7 changes accordingly. When the deformation surface of the inner umbrella cloth 7 is a vertical surface, the aperture of the center hole of the inner umbrella cloth 7 expands to the maximum. When the deformation surface of the inner umbrella cloth 7 is a conical surface, the aperture of the center hole of the inner umbrella cloth 7 shrinks to the minimum. The two deformation forms are supported by the deformable skeleton of the inner umbrella cloth 7, and the deformation point of the inner umbrella cloth 7 is fixedly connected to the A3 point of the outer umbrella cloth 6. The outermost circle of the inner umbrella cloth 7 is formed by a circle of fixed points B1, and B1 overlaps with A2 of the outer umbrella cloth 6. The overlapping fixed part of the inner umbrella cloth 7 and the outer umbrella cloth 6 extends from A2 to A3 on the outer umbrella cloth 6 and extends from B1 to the deformation point on the inner umbrella cloth 7.

[0038] In this embodiment, when the inner umbrella cloth 7 is in the center closed state, the center hole of the inner umbrella cloth 7 is completely retracted, the inner umbrella rope 9 of the inner umbrella cloth 7 is kept tense, and the air inlet at the top of the inner umbrella cloth 7 is 0, so that the wind force below the inner umbrella cloth 7 blows the cloth surface to be fully opened, and the cloth surface of the inner umbrella cloth 7 forms a convex surface between points B1 and B2; the outer umbrella rope 8 of the outer umbrella cloth 6 is kept tense so that the wind force below the outer umbrella cloth 6 blows the cloth surface and is fully opened through the support of the overlapping fixed part with the inner umbrella cloth 7, and the cloth surface of the outer umbrella cloth 6 forms a convex surface with the largest span between points A1 and A2.

[0039] In this embodiment, when the inner umbrella cloth 7 is in a hollow expanded state, the central hole of the inner umbrella cloth 7 gradually opens, the inner umbrella rope 9 gradually relaxes, and the air intake at the top of the inner umbrella cloth 7 gradually increases, so that the wind force below the inner umbrella cloth 7 blows the cloth surface to gradually collapse, and the cloth surface of the inner umbrella cloth 7 forms a flip surface with point B1 downward and inward and point B2 upward and outward; the outer umbrella rope 8 remains tense, and the air intake at the top of the outer umbrella cloth 6 gradually increases. Not only does the wind force below the outer umbrella cloth 6 decrease, but also because the supporting force of the overlapping fixed part with the inner umbrella cloth 7 decreases, the cloth surface of the outer umbrella cloth 6 begins to gradually collapse from being fully opened, and the span of the convex surface formed between points A1 and A2 of the cloth surface of the outer umbrella cloth 6 gradually narrows.

[0040] When the inner umbrella cloth 7 is in the center-open state, the center hole of the inner umbrella cloth 7 is fully opened, the inner umbrella rope 9 is completely relaxed, the air inlet at the top of the inner umbrella cloth 7 is the largest, the cloth surface of the inner umbrella cloth 7 is completely contracted, and the cloth surface is pulled and smoothed into a plane with point B1 facing downward and point B2 facing upward after forming an inward concave surface which expands outward at point B1, is concave at point A3, and expands outward at point B2. The plane presents a fan-shaped trajectory with the lower end of the inner umbrella rope 9 as the fulcrum and is retracted toward the track cable 11; the outer umbrella rope 9 is completely relaxed, the cloth surface of the outer umbrella cloth 6 is completely contracted, and the cloth surface forms a convex surface which expands outward at point A1 and point A2, and is affected by the overlapping fixed part of the inner umbrella cloth 7 to fold point A2 inward, so that the cloth surface is turned outward to form a plane with point A1 facing upward and point A2 facing downward, and the plane presents a fan-shaped trajectory with the lower end of the outer umbrella rope 8 as the fulcrum and is retracted toward the track cable 11.

[0041] In this embodiment, when the inner umbrella cloth 7 is in a hollow retracted state, the central hole of the inner umbrella cloth 7 is gradually retracted, the inner umbrella rope 9 is gradually tightened, and the air intake at the top of the inner umbrella cloth 7 is gradually reduced, so that the wind force below the inner umbrella cloth 7 blows the cloth surface to gradually open, and the cloth surface of the inner umbrella cloth 7 forms a convex surface with point B1 upward and outward and point B2 downward and inward; the outer umbrella rope 8 is gradually tightened, and the air intake at the top of the outer umbrella cloth 6 is gradually reduced. Not only does the wind force below the outer umbrella cloth 6 increase, but also because the supporting force of the overlapping fixed part with the inner umbrella cloth 7 increases, the cloth surface of the outer umbrella cloth 6 begins to gradually open from being completely retracted, and the span of the convex surface formed between points A1 and A2 of the cloth surface of the outer umbrella cloth 6 gradually widens.

[0042] The track cable 11 includes setting points P1, P2 and limit points P4, P5. The track cable 11 is provided with a driver 2 that moves between P1 and P2 and a rope reel 3 that moves between P4 and P5. The driver 2 is connected to the outer parachute rope 8 and the inner parachute rope 9 at the same time, and the rope reel 3 is connected to the connecting rope 10. A pulley block 1 is provided on the track cable below the driver 2, and the outer parachute rope 8 is connected to the driver 2 around the pulley block 1. The cycle steps of the outer parachute cloth 6 and the inner parachute cloth 7 from opening to closing to opening include: S1. The driver 2 is located at the set point P1, the rope reel 3 is located at the limit point P4, the outer umbrella cloth 6 and the inner umbrella cloth 7 form a convex surface in the cross-sectional direction to form a semicircle, P4 is located at the vertex of the semicircle; S2. The drive 2 moves downward, the reel 3 moves downward and unwinds the connecting rope 10, driving the inner umbrella cloth 7 to form a folded surface, and the inner umbrella cloth 7 drives the outer umbrella cloth to form a stacked surface; S3. The driver 2 is located at the setting point P2, the rope reel 3 is located at the limit point P5, the inner umbrella cloth (7) B1, A3 and B2 form a straight surface, and the outer umbrella cloth (6) A1, A2 and A3 form an outward turning surface; S4. The driver 2 moves upward, the rope reel 3 moves upward and reels the connecting rope 10, driving the inner umbrella cloth 7 to gradually form a convex surface, and the inner umbrella cloth (7) drives the outer umbrella cloth (6) to gradually form a convex surface.

[0043] In this embodiment, the inner umbrella cloth 7 drives the outer umbrella cloth 6 to change state. The inner umbrella rope 9 connected to the B1 point on the outer edge of the inner umbrella cloth 7 is simultaneously connected to the driver 2. The outer umbrella rope 8 connected to the A1 point on the outer edge of the outer umbrella cloth 6 is connected to the driver 2 across the pulley block 1. The track cable 11 passes through the center of the inner umbrella cloth 7. The rope reel 3 moves on the track cable 11 while driving the connecting rope 10 connected to the fixed point B2 to unwind or rewind. When the connecting rope 10 is unwound, the center hole of the inner umbrella cloth 7 expands. When the connecting rope 10 is rewound, the center hole of the inner umbrella cloth 7 contracts.

[0044] In this embodiment, when the outer and inner umbrella cloths 6 and 7 are fully extended, the driver 2 stops at the set point P1, the cord reel 3 stops at the limit point 4, and the connecting cord 10 is completely reeled in by the cord reel 3, thereby forming the center hole of the fully retracted inner umbrella cloth 7. When the outer and inner umbrella cloths 6 and 7 are gradually closed, the driver 2 moves downward, the cord reel 3 moves downward, and the connecting cord 10 is gradually unwound by the cord reel 3, thereby forming the center hole of the gradually extended inner umbrella cloth 7. When the outer and inner umbrella cloths 6 and 7 are fully closed, the driver 2 stops at the set point P2, the cord reel 3 stops at the limit point 5, and the connecting cord 10 is completely unwound by the cord reel 3, thereby forming the center hole of the fully extended inner umbrella cloth 7. When the outer and inner umbrella cloths 6 and 7 are gradually extended, the driver 2 moves upward, the cord reel 3 moves upward, and the connecting cord 10 is gradually reeled in by the cord reel 3, thereby forming the center hole of the gradually retracted inner umbrella cloth 7.

[0045] Step S1 specifically includes: S11. The drive 2 stops at the set point P1, the outer parachute rope 8 is tightened and expanded by the wind at point A1, and the angle between the outer parachute rope 8 and the track cable 11 is maintained at a maximum; S12. The rope reel 3 is reeled in and stops at the limit point P4. The inner parachute rope 9 is tightened and expanded outward by the wind at point B1. The angle between the inner parachute rope 9 and the track cable 11 is maintained at its maximum. The connecting rope 10 is tightened, and the inner parachute cloth 7 is in a centrally closed state at point B2.

[0046] In this embodiment, when the outer umbrella cloth 6 and the inner umbrella cloth 7 are in a fully opened state, the driver 2 stops at the setting point P1, the outer umbrella rope 8 has the same length on both sides of the outer umbrella cloth 6, and the angle between the outer umbrella rope 8 and the track cable 11 is the largest; the rope reel 3 stops at the limit point P4, the inner umbrella rope 9 has the largest span on both sides of the inner umbrella cloth 7, and the angle between the inner umbrella rope 9 and the track cable 11 is the largest.

[0047] Step S2 specifically includes: S21. The rope reel 3 goes down and unwinds the connecting rope 10, so that the inner umbrella cloth 7 forms a hollow expansion state in B2; S22. The outer parachute cord 8 is gradually stretched on the A1 side by the downward force of the driver 2. The outer parachute cloth 6 moves A1 toward the track cable 11, causing the continuous convex surface formed by the outer parachute cloths A1, A2, and A3 to gradually form a stacked surface with A1 on the outside and A2 and A3 on the inside. The outer parachute cloths A2 and A3 move downward, forming an inner folded surface with A2 on the bottom and A3 on the top. S23. The inner parachute rope 9 is driven downward by the driver 2, and the point B1 of the inner parachute cloth 7 is driven downward by the driver 2, forming a straight cylindrical surface with B1 at the bottom and B2 at the top.

[0048] In this embodiment, when the outer and inner cloths 6 and 7 are in a gradually closing state, the cord reel 3 unwinds the connecting cord 10, causing point B2 of the inner cloth 7 to expand away from the track cable 11. The cord reel 3 then moves downward, driving point B2 of the inner cloth 7 downward. As point B2 moves downward, point A3 of the inner cloth 7 gradually folds and deforms into a vertical plane, gradually reducing the angle between the inner and outer cords 9 and the track cable 11. The actuator 2 moves downward, driving point B1 of the inner cloth 7 downward, and then driving point A2 of the outer cloth 6 downward through the overlapping fixed portion. The inner cloth 7 gradually closes first, followed by the outer cloth 6. The actuator 2 moves downward, causing the outer cord 8 to lengthen on the side connected to point A1 and shorten on the side connected to the actuator 2, gradually reducing the angle between the outer cord 8 and the track cable 11.

[0049] Step S3 specifically includes: S31. The drive 2 stops at the set point P2, the outer parachute line 8 is relaxed and turned outward by the wind at point A1, and the angle between the outer parachute line 8 and the track cable 11 is kept minimum; S32. The rope reel 3 unwinds and stops at the limit point P5. The inner parachute rope 9 relaxes and retracts inwards at point B1 under the action of tension. The angle between the inner parachute rope 9 and the track cable 11 remains minimal. The connecting rope 10 is loosened, and the inner parachute cloth 7 forms a central opening at point B2.

[0050] In this embodiment, when the outer umbrella cloth 6 and the inner umbrella cloth 7 are in a fully closed state, the driver 2 stops at the setting point P2, the outer umbrella rope 8 has the same length on both sides of the outer umbrella cloth 6, and the angle between the outer umbrella rope 8 and the track cable 11 is the smallest; the rope winder 3 stops at the limit point P5, the span of the inner umbrella rope 9 on both sides of the inner umbrella cloth 7 is the smallest, and the angle between the inner umbrella rope 9 and the track cable 11 is the smallest.

[0051] Step S4 specifically includes: S41. The rope reel 3 goes up and reels the connecting rope 10, so that the inner umbrella cloth 7 forms a hollow collapsed state in B2; S42. The outer umbrella rope 8 is gradually shortened on the A1 side by the upward action of the driver 2, and the A1 of the outer umbrella cloth 6 moves in the direction away from the track cable 11, so that the continuous outward turning surface formed by A1, A2, and A3 of the outer umbrella cloth (6) gradually forms a stacked surface with A1 outside and A2 and A3 inside. A2 and A3 of the outer umbrella cloth (6) move upward, so that the outer umbrella cloth (6) forms an outward expansion surface with A2 at the bottom and A3 at the top; S43. The inner parachute rope 9 is moved upward by the driver 2, and the inner parachute cloth B1 7 is moved upward by the wind, forming an unfolded surface with B1 at the bottom and B2 at the top. In this embodiment, when the outer and inner cloths 6 and 7 are gradually expanding, the cord reel 3 winds the connecting cord 10, driving point B2 of the inner cloth 7 toward the track cable 11. The cord reel 3 moves upward, driving point B2 of the inner cloth 7 upward. As point B2 moves upward, point A3 of the inner cloth 7 gradually converges and deforms into a conical surface, gradually increasing the angle between the inner and outer cords 9 and the track cable 11. The driver 2 moves upward, driving point B1 of the inner cloth 7 upward, and then driving point A2 of the outer cloth 6 upward via the overlapping fixed portion. The inner cloth 7 gradually expands first, followed by the outer cloth 6. As the driver 2 moves upward, the outer cord 8 shortens on the side connected to point A1 and lengthens on the side connected to the driver 2, gradually increasing the angle between the outer cord 8 and the track cable 11.

[0052] The time when the rope reel 3 reaches the limit point P5 is earlier than the time when the driver 2 reaches the setting point P2, so that the inner umbrella cloth 7 is folded to both sides of the track cable 11 before the outer umbrella cloth 6.

[0053] In this embodiment, the retraction of the inner sheet 7 drives the retraction of the outer sheet 6 by controlling the speed of the rope reel 3 and the driver 2, thereby enabling the partial opening and closing of the umbrella to drive the overall opening and closing of the umbrella, improving the opening and closing efficiency of the umbrella and reducing energy consumption. The rope reel 3 moves on the track cable 11 while reeling or unreeling. When the outer and inner sheets 6 and 7 gradually close, the rope reel 3 reaches the limit point P5 first, and the driver 2 reaches the set point P2 later, causing point B2 of the inner sheet 7 to be unwound first, causing point B1 of the inner sheet 7 to be pulled downward last, and causing point A2 of the outer sheet 6 to be pulled downward last.

[0054] The maximum angle between the connecting rope 10 and the track cable 11 is greater than the maximum angle between the outer parachute rope 8 or the inner parachute rope 9 and the track cable 11.

[0055] In this embodiment, by increasing the maximum angle between the connecting rope 10 and the track cable 11, the connecting rope 10 controls the opening of the inner drapery 7 faster than either the inner drapery 7 or the outer drapery 6, thereby achieving efficient control of the parachute, with a localized portion driving the entire drapery, and reducing energy consumption. The maximum angle between the connecting rope 10 and the track cable 11 is 90°, while the maximum angle between the outer drapery lines 8 or the inner drapery lines 9 and the track cable 11 is 60°.

[0056] The radius of the inner umbrella cloth 7 is Ra2, and the radius of the central opening formed by the inner umbrella cloth 7 and the track cable 11 at point B2 is Ra3, 1 / 2Ra2≤Ra3≤3 / 4Ra2.

[0057] In this embodiment, Ra3=0.6Ra2.

[0058] Example 2 like Figure 1-8 As shown, this embodiment further provides a high-altitude parachute linkage opening and closing device, including the high-altitude parachute linkage opening and closing method described in Example 1, which further includes: Track cable 11; Pulley block 1, fixed on the track cable 11; The parachute body, which is sleeved on the track cable 11 at the top center, includes an outer parachute cloth 6, an inner parachute cloth 7, an outer parachute rope 8, and an inner parachute rope 9. The outer parachute cloth 6 and the inner parachute cloth 7 are connected as a whole through reserved binding points A2 and A3. One end of the outer parachute rope 8 is connected to the A1 point of the outer parachute cloth 6, and the other end is connected to the driver 2 by wrapping around the pulley block 1 and spanning across both sides of the outer parachute cloth 6. One end of the inner parachute rope 9 is connected to the B1 point of the inner parachute cloth 7, and the other end is connected to the driver 2. A connecting rope 10, one end of which is connected to the inner side of the inner umbrella cloth 7, and the other end of which is movably connected to the track cable 11; a driver 2, which moves on the track cable 11 and is located between the setting point P1 and the setting point P2, and is connected to the outer parachute line 8 and the inner parachute line 9, and drives the outer parachute line 8 and the inner parachute line 9 relative to the track cable 11; The rope reel moves on the track cable 11 and is located between the limit point P4 and the limit point P5, is connected to the connecting rope 10, and reels or unreels the connecting rope 10 relative to the opening size of the inner umbrella cloth 7.

[0059] In this embodiment, the outer umbrella cloth 6 includes an outer edge fixing point A1, a middle fixing point A2, and an inner edge fixing point A3. The inner umbrella cloth 7 includes an outer edge fixing point B1, a middle fixing point, and an inner edge fixing point B2. The inner edge fixing point A3 of the outer umbrella cloth 6 corresponds to the middle fixing point of the inner umbrella cloth 7 and is fixed in an overlapping manner. The outer edge fixing point B1 of the inner umbrella cloth 7 corresponds to the middle fixing point A2 of the outer umbrella cloth 6 and is fixed in an overlapping manner.

[0060] It also includes a locking device, which is arranged at the pulley block (1). When the driver (2) stops at the setting point P1 or the setting point P2, it is locked with the locking device, and when the driver 2 moves up or down, it is unlocked from the locking device.

[0061] In this embodiment, when the umbrella is fully opened, the locking device located at the pulley block 1 remains in a locked state, and the driver 2 stops at the setting point P1 on the track cable 11, so that the umbrella remains in an open state and the wind force is collected; when the umbrella is ready to be closed, the locking device located at the pulley block 1 remains in an unlocked state, and the driver 2 descends along the track cable 11; when the umbrella is fully closed, the locking device located at the pulley block 1 remains in a locked state again, and the driver 2 stops at the setting point P2 on the track cable 11, so that the umbrella remains in a closed state to avoid being displaced by the wind; when the umbrella is ready to be opened, the locking device located at the pulley block 1 is unlocked again, and the driver 2 ascends along the track cable 11.

[0062] The radius of the outer umbrella cloth 6 is Ra1, the radius of the inner umbrella cloth 7 is Ra2, 1 / 2Ra1≤Ra2≤5 / 8Ra1, the length of the outer umbrella rope 8 is in the range of 3.42Ra1~3.73Ra1, and the length of the inner umbrella rope 9 is 2Ra2.

[0063] In this embodiment, the radius Ra1 of the outer umbrella cloth 6 is 10m, the radius Ra2 of the inner umbrella cloth 7 is in the range of 5m to 6.25m, the length of the outer umbrella rope 8 is between 34.2m and 37.3m, and the length of the inner umbrella rope 9 is between 10m and 12.5m.

[0064] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for linking the opening and closing of a high-altitude parachute, the high-altitude parachute comprising: A track cable (11), an umbrella rope, an outer umbrella cloth (6) and an inner umbrella cloth (7) sleeved on the track cable (11) at the top center, and a connecting rope (10) for connecting the inner umbrella cloth (7) and the track cable (11); The outer umbrella cloth (6) includes an outer edge fixing point A1, a middle fixing point A2, and an inner edge fixing point A3; the inner umbrella cloth (7) includes an outer edge fixing point B1, a middle fixing point, and an inner edge fixing point B2; the inner edge fixing point A3 of the outer umbrella cloth (6) and the middle fixing point of the inner umbrella cloth (7) are overlapped and fixed correspondingly; the outer edge fixing point B1 of the inner umbrella cloth (7) and the middle fixing point A2 of the outer umbrella cloth (6) are overlapped and fixed correspondingly; The parachute cord includes an outer parachute cord (8) connected to A1 and an inner parachute cord (9) connected to B1; One end of the connecting rope (10) is connected to B2, and the other end is movably connected to the track cable (11) through the rope reel (3); The outer umbrella cloth (6) is located between the outer umbrella rope (8) and the inner umbrella rope (9), and the inner umbrella cloth (7) is located between the inner umbrella rope (9) and the connecting rope (10); It is characterized in that the linkage opening and closing method includes: When the wing is fully expanded: The inner umbrella cloth (7) B2 is brought into a centrally closed state toward the track cable (11) by the winding of the connecting rope (10); the outer umbrella rope (8) and the inner umbrella rope (9) are tightened, and the outer umbrella cloth (6) and the inner umbrella cloth (7) are both raised by the wind; When the wing is ready to close: B2 of the inner umbrella cloth (7) is in a hollow expansion state in a direction away from the track cable (11) by unwinding the connecting rope (10); the inner umbrella rope (9) is tightened, and the inner umbrella cloth (7) is turned upward to form a folded surface with B1 at the bottom and B2 at the top; the outer umbrella cloth (6) forms a stacked surface with A1 approaching A2 and A3; When the wing is fully closed: The inner umbrella cloth (7) is in a centrally open state in a direction away from the track cable (11) by unwinding the connecting rope (10); the outer umbrella rope (8) and the connecting rope (10) are relaxed, the inner umbrella cloth (7) is in a straight cylindrical state with B1 at the bottom and B2 at the top and is folded close to the track cable (11); the outer umbrella cloth (6) is completely turned outward to form an outward-turned surface with A1 at the top and A3 at the bottom and is folded close to the track cable (11); When the wing is ready to open: The B2 of the inner umbrella cloth (7) is rolled up by the connecting rope (10) and is in a hollow and gathered state toward the track cable (11); the outer umbrella rope (8) is gradually tightened, and the inner umbrella cloth (7) is gradually raised under the action of wind force, driving the outer umbrella cloth (6) to gradually raise under the action of wind force.

2. A high altitude parachute linkage opening and closing method according to claim 1, characterized in that: The track cable (11) includes setting points P1 and P2 and limit points P4 and P5. The track cable (11) is provided with a driver (2) that moves between P1 and P2 and a rope reel (3) that moves between P4 and P5. The driver (2) is connected to the outer parachute rope (8) and the inner parachute rope (9) at the same time, and the rope reel (3) is connected to the connecting rope (10). A pulley block (1) is provided on the track cable (11) below the driver (2). The outer parachute rope (8) is wound around the pulley block (1) and connected to the driver (2). The cycle steps of the outer parachute cloth (6) and the inner parachute cloth (7) from opening to closing to opening include: S1. The driver (2) is located at the setting point P1, the rope reel (3) is located at the limit point P4, the convex surface formed by the outer umbrella cloth (6) and the inner umbrella cloth (7) forms a semicircle in the cross-sectional direction, and P4 is located at the vertex of the semicircle; S2. The driver (2) moves downward, the rope reel (3) moves downward and unwinds the connecting rope (10), driving the inner umbrella cloth (7) to form a folding surface, and the inner umbrella cloth (7) drives the outer umbrella cloth (6) to form a stacking surface; S3. The driver (2) is located at the setting point P2, the rope reel (3) is located at the limit point P5, B1, A3 and B2 of the inner umbrella cloth (7) form a straight cylindrical surface, and A1, A2 and A3 of the outer umbrella cloth (6) form an outward turning surface; S4. The driver (2) moves upward, the rope reel (3) moves upward and reels the connecting rope (10), driving the inner umbrella cloth (7) to gradually form a convex surface, and the inner umbrella cloth (7) drives the outer umbrella cloth (6) to gradually form a convex surface.

3. A high altitude parachute linkage opening and closing method according to claim 2, characterized in that: Step S1 specifically includes: S11. The driver (2) stops at the set point P1, the outer parachute rope (8) is tightened and expanded outward at point A1 by the wind, and the angle between the outer parachute rope (8) and the track cable (11) is kept at the maximum; S12. The rope reel (3) is wound and stopped at the limit point P4. The inner parachute rope (9) is tightened and expanded outward at point B1 by the wind force. The angle between the inner parachute rope (9) and the track cable (11) is kept at the maximum. The connecting rope (10) is tightened, and the inner parachute cloth (7) forms a central closed state at point B2.

4. A high altitude parachute linkage opening and closing method according to claim 2, characterized in that: Step S2 specifically includes: S21. The rope reel (3) moves downward and unwinds the connecting rope (10), so that the inner umbrella cloth (7) forms a hollow expansion state at B2; S22. The outer umbrella rope (8) is gradually stretched on the A1 side by the downward action of the driver (2), and A1 of the outer umbrella cloth (6) moves toward the direction close to the track cable (11), so that the continuous convex surface formed by A1, A2, and A3 of the outer umbrella cloth (6) gradually forms a stacked surface with A1 on the outside and A2 and A3 on the inside. A2 and A3 of the outer umbrella cloth (6) move downward, so that the outer umbrella cloth (6) forms an inner folded surface with A2 on the bottom and A3 on the top; S23. The inner parachute rope (9) is driven downward by the driver (2), and B1 of the inner parachute cloth (7) is driven downward by the driver (2), forming a straight cylindrical surface with B1 at the bottom and B2 at the top.

5. A high altitude parachute linkage opening and closing method according to claim 2, characterized in that: Step S3 specifically includes: S31. The driver (2) stops at the set point P2, the outer parachute line (8) is relaxed and turned outward by the wind at point A1, and the angle between the outer parachute line (8) and the track cable (11) is kept minimum; S32. The rope reel (3) unwinds and stops at the limit point P5. The inner parachute rope (9) relaxes and retracts inwards at point B1 under the action of tension. The angle between the inner parachute rope (9) and the track cable (11) remains minimum. The connecting rope (10) is loosened, and the inner parachute cloth (7) forms a central opening state at point B2.

6. A high altitude parachute linkage opening and closing method according to claim 2, characterized in that: Step S4 specifically includes: S41. The rope reel (3) goes up and reels the connecting rope (10), so that the inner umbrella cloth (7) forms a hollow collapsed state at B2; S42. The outer umbrella rope (8) is gradually shortened on the A1 side by the upward action of the driver (2), and A1 of the outer umbrella cloth (6) moves in a direction away from the track cable (11), so that the continuous outward turning surface formed by A1, A2, and A3 of the outer umbrella cloth (6) gradually forms a stacked surface with A1 outside and A2 and A3 inside. A2 and A3 of the outer umbrella cloth (6) move upward, so that the outer umbrella cloth (6) forms an outward extension surface with A2 at the bottom and A3 at the top; S43. The inner parachute rope (9) is moved upward by the driver (2), and the B1 of the inner parachute cloth (7) is moved upward by the wind, forming an unfolding surface with B1 at the bottom and B2 at the top.

7. A high altitude parachute linkage opening and closing method according to any one of claims 1 to 6, characterized in that: The radius of the inner umbrella cloth (7) is Ra2, and the radius of the central opening formed by the inner umbrella cloth (7) and the track cable (11) at point B2 is Ra3, and 1 / 2Ra2≤Ra3≤3 / 4Ra2.

8. A high-altitude parachute linkage opening and closing device, comprising the high-altitude parachute linkage opening and closing method according to claim 7, characterized in that: Also includes: Track cables (11); A pulley assembly (1) fixed to the track cable (11); The center of the top of the umbrella body is sleeved on the track cable (11), including an outer umbrella cloth (6), an inner umbrella cloth (7), an outer umbrella rope (8), and an inner umbrella rope (9). The outer umbrella cloth (6) and the inner umbrella cloth (7) are connected as a whole through reserved binding points A2 and A3. One end of the outer umbrella rope (8) is connected to the A1 point of the outer umbrella cloth (6), and the other end is connected to the driver (2) by winding around the pulley block (1) and spanning across both sides of the outer umbrella cloth (6). One end of the inner umbrella rope (9) is connected to the B1 point of the inner umbrella cloth (7), and the other end is connected to the driver (2). A connecting rope (10), one end of which is connected to the inner side of the inner umbrella cloth (7), and the other end of which is movably connected to the track cable (11); A driver (2) moves on the track cable (11) and is located between the setting point P1 and the setting point P2, is connected to the outer parachute rope (8) and the inner parachute rope (9), and drives the outer parachute rope (8) and the inner parachute rope (9) to move relative to the track cable (11); The rope reel moves on the track cable (11) and is located between the limit point P4 and the limit point P5, is connected to the connecting rope (10), and reels or unreels the connecting rope (10) relative to the opening size of the inner umbrella cloth (7).

9. The high altitude parachute linkage opening and closing device according to claim 8, characterized in that: It also includes a locking device, which is arranged at the pulley block (1). When the driver (2) stops at the setting point P1 or the setting point P2, it is locked with the locking device, and when the driver (2) moves up or down, it is unlocked from the locking device.

10. The high altitude parachute linkage opening and closing device according to claim 8, characterized in that: The radius of the outer umbrella cloth (6) is Ra1, the radius of the inner umbrella cloth (7) is Ra2, 1 / 2Ra1≤Ra2≤5 / 8Ra1, the length of the outer umbrella rope (8) ranges from 3.42Ra1 to 3.73Ra1, and the length of the inner umbrella rope (9) is 2Ra2.

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