CN112758357B - Flexible film inflatable sphere and multidirectional folding method for accommodating cuboid thereof - Google Patents
Flexible film inflatable sphere and multidirectional folding method for accommodating cuboid thereof Download PDFInfo
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- CN112758357B CN112758357B CN202110049955.6A CN202110049955A CN112758357B CN 112758357 B CN112758357 B CN 112758357B CN 202110049955 A CN202110049955 A CN 202110049955A CN 112758357 B CN112758357 B CN 112758357B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000012528 membrane Substances 0.000 claims abstract description 157
- 210000005077 saccule Anatomy 0.000 claims abstract description 33
- 239000003677 Sheet moulding compound Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000011347 resin Substances 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 4
- 229920001721 polyimide Polymers 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 108091092878 Microsatellite Proteins 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 6
- 239000002033 PVDF binder Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/222—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles for deploying structures between a stowed and deployed state
- B64G1/2221—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles for deploying structures between a stowed and deployed state characterised by the manner of deployment
- B64G1/2227—Inflating
Abstract
A flexible film inflatable sphere and a multidirectional folding method for accommodating a cuboid thereof belong to the technical field of off-orbit at the last stage of the service life of a microsatellite, and further improve the ratio of the unfolded volume to the folded volume of the film sphere; the air nozzle only comprises a round clamping piece made of silicon rubber resin material and an air charging conduit made of sheet molding compound; the folding method comprises a step of exhausting air; finishing all the membranes one by one according to the spindle shape of the membranes; further folding the membrane-shaped saccule which is folded to be thickened along the short axis direction to enable the saccule to reach the target length in the short axis direction; folding the saccule which is folded in the short axis direction to reach the target length in a zigzag manner along the long axis direction to enable the saccule to reach the target length in the long axis direction; the invention is used for satellite derailment.
Description
Technical Field
The invention belongs to the technical field of off-orbit at the last stage of the working life of a microsatellite, and particularly relates to a flexible film inflatable sphere and a multidirectional folding method for storing a cuboid of the flexible film inflatable sphere.
Background
In order to limit the growth of space debris and protect the space environment, according to the international standard ISO23312 detailed requirement for spacecraft space debris mitigation issued in 2018, a small satellite needs to carry a resistance-increasing off-orbit film sphere which has no power consumption and small storage volume when being launched, the film sphere is carried in a folded storage state, when the small satellite reaches the end of the service life, the film sphere is orderly unfolded under the condition of inflation and pressurization, the volume is increased, the air resistance effect is increased, the satellite is enabled to be off-orbit within a given period, and therefore space garbage is prevented from being formed due to long-term detention in the orbit.
In conclusion, the larger the ratio of the unfolded volume to the folded volume of the film sphere is, the more favorable the resistance increase and the carrying are; the folding of the film sphere looks simple, and effective folding can be realized only by a complete and feasible scheme, which is developed for further improving the ratio of the unfolding volume to the folding volume of the film sphere.
Disclosure of Invention
The invention aims to further improve the ratio of the unfolded volume to the folded volume of a film sphere, and provides a flexible film inflatable sphere and a multidirectional folding method for accommodating a cuboid thereof, wherein the technical scheme is as follows:
a flexible film inflatable sphere comprises a balloon and an air nozzle, wherein the balloon comprises spindle-shaped membranes in a plurality of warp directions which surround the sphere, adjacent membranes are bonded in a sealing mode, two ends of all the membranes are bonded through pole cap pieces respectively, the air nozzle is arranged in the center of one pole cap piece at one end, namely a south pole and a north pole, and the pole provided with the air nozzle is conventionally called the south pole;
the air tap only comprises a round clamping piece made of silicon rubber resin material and an inflation conduit made of sheet molding compound, a circumferential notch is formed in the round clamping piece, so that the round clamping piece is provided with a circumferential clamping part, a through hole for installing the air tap is formed in the balloon, the diameter of the through hole for installing the air tap is smaller than that of the round clamping piece, the round clamping piece is arranged at the through hole, the circumferential clamping part of the round clamping piece clamps the balloon, and the clamping parts are bonded; the circular clamping piece is provided with a jack for inserting the inflation catheter, the inflation catheter is inserted into the circular clamping piece and is in interference fit with the corresponding jack, for example, the outer diameter of the inflation catheter is one millimeter smaller than the diameter of the corresponding jack, polyimide single-sided adhesive is wound on the inner side portion, located on the balloon, of the inflation catheter, so that the anti-falling force reaches more than ninety newtons, and the inflation catheter can be effectively prevented from being separated from the circular clamping piece.
The multidirectional folding method for containing the cuboid of the flexible film inflatable sphere comprises the following steps:
firstly, exhausting; exhausting the gas in the balloon and keeping the gas exhausted during the folding process, such as exhausting the gas by using a vacuum pump, and keeping the vacuum pump running during the folding process;
secondly, finishing all the membranes one by one according to the spindle shape of the membranes; arranging a first membrane, taking any membrane of the air-exhausted balloon as the first membrane, flatly unfolding the first membrane and placing the first membrane on a horizontal surface such as a table top or the ground; then arranging a second membrane, taking the membrane connected with any one of the two sides of the first membrane as the second membrane, folding the second membrane along the long axis after flatly unfolding the second membrane, and pasting the second membrane on the flatly unfolded first membrane; arranging a third membrane, taking the membrane which is connected with the side which is not arranged in the two sides of the first membrane as the third membrane, folding the third membrane along the long axis after the third membrane is flatly unfolded, and pasting the third membrane on the flatly unfolded first membrane; arranging a fourth membrane, taking the membrane connected with the side which is not arranged in the two sides of the second membrane as the fourth membrane, flatly unfolding the fourth membrane, folding the fourth membrane along the long axis, and pasting the fourth membrane on the second membrane; finishing a fifth membrane, taking the membrane which is connected with the side which is not finished in the two sides of the third membrane as the fifth membrane, flatly unfolding the fifth membrane, folding the fifth membrane along the long axis, and pasting the fifth membrane on the third membrane; the rest membranes are orderly arranged according to the rule until the last membrane is flatly unfolded, the whole saccule is folded into a thickened membrane shape, both sides of the long axis of the thickened membrane-shaped saccule are divided into a plurality of layers by the folded crease, each layer is formed by overlapping two connected half membranes, and the number of the layers of the plurality of layers is determined by the number of the membranes forming the saccule; for example, after a balloon composed of eight sheets is folded into a thickened sheet shape, four and four layers are respectively provided on both sides of the long axis thereof, for example, after a balloon composed of nine sheets is folded into a thickened sheet shape, four and five layers are respectively provided on both sides of the long axis thereof, for example, after a balloon composed of ten sheets is folded into a thickened sheet shape, five and five layers are respectively provided on both sides of the long axis thereof, for example, after a balloon composed of eleven sheets is folded into a thickened sheet shape, five and six layers are respectively provided on both sides of the long axis thereof, for example, after a balloon composed of twelve sheets is folded into a thickened sheet shape, six and six layers are respectively provided on both sides of the long axis thereof, for example, after a balloon composed of thirteen sheets is folded into a thickened sheet shape, six and seven layers are respectively provided on both sides of the long axis thereof, for example, after a balloon composed of fourteen sheets is folded into a thickened sheet shape, seven layers and seven layers are respectively arranged on two sides of the long axis, for example, after a saccule consisting of fifteen membranes is folded into a thickened membrane shape, seven layers and eight layers are respectively arranged on two sides of the long axis, and after the saccule is summarized, four conditions are found in total:
in the first case, N layers and N layers are respectively arranged on both sides of the long axis, for example, a balloon consisting of eight, twelve and sixteen membranes;
in the second case, the two sides of the long axis are respectively N layers and N +1 layers, such as a balloon consisting of nine, thirteen or seventeen membranes;
in the third case, the two sides of the long axis are respectively an M layer and an M layer, for example, a balloon consisting of ten, fourteen and eighteen membranes;
in the fourth case, the two sides of the long axis are respectively an M layer and an M +1 layer, such as a balloon consisting of eleven, fifteen and nineteen membranes;
wherein N is an even number and M is an odd number;
thirdly, further folding the saccule which is folded into a thickened diaphragm shape along the short axis direction to enable the saccule to reach the target length in the short axis direction; the folding part can be fixed by a clamp through single operation, for example, the folding part is clamped and fixed by a dovetail clamp at intervals of fifteen centimeters to twenty centimeters along the folding line;
in the first case, two sides of the long axis are respectively provided with N layers and N layers, wherein N is an even number, and two sides of the long axis are respectively provided with two layers of opposite curls; namely, the first layer is folded upwards, and the second layer is folded downwards; the third layer is folded upwards, and the fourth layer is folded downwards; … …, respectively; the advantage over crimping is that the folded portions can be pressed against each other;
in the second case, two sides of the long axis are respectively provided with N layers and N +1 layers, N is an even number, two sides of the long axis are respectively provided with every two layers which are oppositely folded, and the remaining layer at the top of one side is folded in a zigzag manner across the long axis, so that the thicknesses of the two sides of the long axis are the closest to the same;
in the third situation, the two sides of the long axis are respectively provided with M layers and M layers, wherein M is an odd number, each two layers are oppositely folded at the two sides of the long axis, and the remaining layer at the top of each side is folded downwards;
in the fourth situation, two sides of the long axis are respectively provided with M layers and M +1 layers, wherein M is an odd number, each two layers on one side of the M layers are oppositely folded, and the rest layer on the top is folded downwards; each two layers of the M +1 layer except the uppermost two layers are oppositely folded, one layer at the lower side of the uppermost two layers is folded downwards, and the other layer at the upper side is folded in a zigzag shape across the long axis;
folding the saccule which is folded in the short axis direction to reach the target length in a zigzag manner along the long axis direction to enable the saccule to reach the target length in the long axis direction;
the auxiliary tool is used for zigzag folding, the auxiliary tool comprises a U-shaped frame and two positioning latch rods, the length of each positioning latch rod is larger than the total width of two upright posts of the U-shaped frame, one end, far away from an air nozzle, of a saccule which is used for zigzag folding is arranged in the U-shaped frame, the saccule is pressed by the U-shaped frame on one side, close to the air nozzle, of the U-shaped frame by using a first positioning latch rod, then the saccule on one side, far away from the U-shaped frame, of the first positioning latch rod is folded, a bent part is inserted to the other side of the U-shaped frame from the space between the two upright posts, a second positioning latch rod is inserted into the inner side of the bent part on the other side of the U-shaped frame, the free end of the saccule is pulled, the second positioning latch rod presses the saccule by means of the U-shaped frame, and a zigzag folding cycle is completed; pulling out the first positioning latch rod and pressing part of the balloon above the first positioning latch rod to perform next zigzag folding cycle until the zigzag folding of the balloon along the long axis direction is completed;
so far, the sacculus is folded into the cuboid, with the air cock rely on the sacculus after the vacuum pump disconnection can.
The invention has the beneficial effects that: the design of a metal-free air nozzle does not generate harmful fragments, and the folded ball body can not be damaged, so that the ball body can be folded and compressed at will; the sphere in four conditions can be efficiently folded into a cuboid or cube shape, is suitable for the design of a modular installation interface of a commercial satellite, has uniform thickness after being folded, high coincidence degree of the centroid and the geometric centroid, and volume ratio of more than thirty five hundred before and after being unfolded; the cuboid structure folded by the method can be rapidly and orderly unfolded into a sphere under the inflation and pressurization conditions, and is particularly suitable for the sphere with the thickness of the laminated membrane not more than two hundred fifty microns and resistant to space environments such as atomic oxygen, ultraviolet and the like.
Description of the drawings:
FIG. 1 is a schematic view of the overall structure of a sphere;
FIG. 2 is an exploded schematic view of FIG. 1;
FIG. 3 is a schematic view of the structure of the air faucet;
FIG. 4 is a schematic view of the connection structure of the air nozzle and the balloon;
FIG. 5 is a schematic illustration of the balloon folded into a thickened film shape after the step of collating all films one by one according to the spindle shape of the film;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a front view of FIG. 5;
FIG. 8 is a schematic view of the folding process of FIG. 5;
FIG. 9 is a schematic diagram of the four cases of FIG. 5, from top to bottom, showing the first to fourth cases respectively;
fig. 10 is a schematic view of a method of further folding the four cases in fig. 9 in the short axis direction;
FIG. 11 is a schematic view of the end of the bladder being zigzag folded away from the air nozzle being placed in a U-shaped frame and the bladder being pressed by a first positioning latch lever;
FIG. 12 is a schematic view of the balloon folded and the bend inserted between two posts to the other side of the U-shaped frame;
FIG. 13 is a schematic view of a second positioning latch rod inserted inside the bend;
fig. 14 is a schematic view of a cycle of performing a plurality of zigzag folding using an auxiliary tool.
The specific implementation mode is as follows:
referring to fig. 1 to 14, a flexible film inflatable sphere comprises a balloon 1 and an air nozzle 2, wherein the balloon 1 comprises spindle-shaped membranes 1-1 surrounding a sphere in multiple warp directions, the adjacent membranes 1-1 are hermetically bonded, two ends of all the membranes 1-1 are bonded through pole cap pieces 1-2 respectively, the air nozzle 2 is arranged at the central position of the pole cap piece 1-2 at one end, namely a south pole and a north pole, and the pole of the air nozzle 2 is conventionally called the south pole;
the air tap 2 only comprises a round clamping piece 2-1 made of silicon rubber resin material and an air charging conduit 2-2 made of sheet molding compound, and the sheet molding compound is subjected to one-step compression molding at high temperature, so that the air tap has the advantages of high mechanical strength, light material weight, corrosion resistance, long service life, high insulating strength, flame retardance and good sealing performance; the round clamping piece 2-1 is provided with a circumferential notch 2-1-1, so that the round clamping piece 2-1 is provided with a circumferential clamping part, the balloon 1 is provided with a through hole for installing the air nozzle 2, the diameter of the through hole for installing the air nozzle 2 is smaller than that of the round clamping piece 2-1, the round clamping piece 2-1 is arranged at the through hole, the circumferential clamping part of the round clamping piece 2-1 clamps the balloon 1, and the clamping parts are bonded; the round clamping piece 2-1 is provided with a jack for inserting the inflation conduit 2-2, the inflation conduit 2-2 is inserted with the round clamping piece 2-1, the inflation conduit 2-2 is in interference fit with the corresponding jack, for example, the outer diameter of the inflation conduit 2-2 is one millimeter smaller than the diameter of the corresponding jack, the inner part of the inflation conduit 2-2, which is positioned in the balloon 1, is wound with polyimide single-sided adhesive 2-3, so that the anti-falling force reaches more than ninety newtons, and the inflation conduit 2-2 can be effectively prevented from being separated from the round clamping piece 2-1.
The multidirectional folding method for containing the cuboid of the flexible film inflatable sphere comprises the following steps:
firstly, exhausting; exhausting the gas in the balloon 1 and keeping the gas exhausted during the folding process, for example, exhausting the gas by using a vacuum pump, and keeping the vacuum pump running during the folding process;
secondly, arranging all the membranes 1-1 one by one according to the spindle shape of the membranes 1-1; firstly, arranging a first membrane 1-1-1, taking any membrane 1-1 of the balloon 1 after air exhaust as the first membrane 1-1-1, flatly unfolding the first membrane 1-1-1, and placing the first membrane on a horizontal surface such as a table top or the ground; then, second membrane 1-1-2 is arranged, the membrane 1-1 connected with any one of the two sides of the first membrane 1-1-1 is used as the second membrane 1-1-2, the second membrane 1-1-2 is folded along the long axis after being flatly unfolded, and is attached to the flatly unfolded first membrane 1-1-1; finishing a third membrane 1-1-3, taking the membrane 1-1, which is connected with the unfinished one of the two sides of the first membrane 1-1-1, as the third membrane 1-1-3, folding the third membrane 1-1-3 along the long axis after flatly spreading, and pasting the third membrane on the flatly spread first membrane 1-1-1; finishing a fourth diaphragm 1-1-4, taking the diaphragm 1-1, which is connected with the unfinished side of the two sides of the second diaphragm 1-1-2, as the fourth diaphragm 1-1-4, flatly unfolding the fourth diaphragm 1-1-4, folding the fourth diaphragm along the long axis, and pasting the fourth diaphragm on the second diaphragm 1-1-2; finishing a fifth membrane 1-1-5, taking the membrane 1-1, which is connected with the unfinished one of the two sides of the third membrane 1-1-3, as the fifth membrane 1-1-5, flatly unfolding the fifth membrane 1-1-5, folding the fifth membrane along the long axis, and pasting the fifth membrane on the third membrane 1-1-3; the remaining membranes 1-1 are orderly arranged according to the rule until the last membrane 1-1 is flatly unfolded, the whole saccule 1 is folded into a thickened membrane 1-1 shape, both sides of the long axis of the thickened membrane 1-shaped saccule 1 are divided into a plurality of layers by the folded crease, each layer is formed by overlapping two connected half membranes 1-1, and the number of the layers is determined by the number of the membranes 1-1 forming the saccule 1; for example, after a balloon 1 composed of eight sheets 1-1 is folded into a thickened film 1-1 shape, four layers and four layers are respectively arranged on both sides of the long axis, for example, after a balloon 1 composed of nine sheets 1-1 is folded into a thickened film 1-1 shape, four layers and five layers are respectively arranged on both sides of the long axis, for example, after a balloon 1 composed of ten sheets 1-1 is folded into a thickened film 1-1 shape, five layers and five layers are respectively arranged on both sides of the long axis, for example, after a balloon 1 composed of eleven sheets 1-1 is folded into a thickened film 1-1 shape, five layers and six layers are respectively arranged on both sides of the long axis, for example, after a balloon 1 composed of twelve sheets 1-1 is folded into a thickened film 1-1 shape, six layers and six layers are respectively arranged on both sides of the long axis, for example, after the balloon 1 composed of thirteen membranes 1-1 is folded into a thickened membrane 1-1 shape, the two sides of the long axis are respectively six layers and seven layers, for example, after the balloon 1 composed of fourteen membranes 1-1 is folded into a thickened membrane 1-1 shape, the two sides of the long axis are respectively seven layers and seven layers, for example, after the balloon 1 composed of fifteen membranes 1-1 is folded into a thickened membrane 1-1 shape, the two sides of the long axis are respectively seven layers and eight layers, and after the four conditions are summarized, the four conditions are found in total:
the two sides of the long axis in the first case are respectively N layers and N layers, such as a balloon 1 consisting of eight, twelve and sixteen membranes 1-1;
in the second case, N layers and N +1 layers are respectively arranged on both sides of the long axis, such as a balloon 1 consisting of nine, thirteen and seventeen membranes 1-1;
in the third case, the two sides of the long axis are respectively M layers and M layers, such as a balloon 1 consisting of ten, fourteen and eighteen membranes 1-1;
in the fourth case, the two sides of the long axis are respectively M layers and M +1 layers, for example, the balloon 1 consists of eleven, fifteen and nineteen membranes 1-1;
wherein N is an even number and M is an odd number;
thirdly, further folding the saccule 1 which is folded into the thickened membrane 1-1 shape along the short axis direction to enable the saccule to reach the target length in the short axis direction; the folding part can be fixed by a clamp through single operation, for example, the folding part is clamped and fixed by a dovetail clamp at intervals of fifteen centimeters to twenty centimeters along the folding line;
in the first case, two sides of the long axis are respectively provided with N layers and N layers, wherein N is an even number, and two sides of the long axis are respectively provided with two layers of opposite curls; namely, the first layer is folded upwards, and the second layer is folded downwards; the third layer is folded upwards, and the fourth layer is folded downwards; … …, respectively; the advantage over crimping is that the folded portions can be pressed against each other;
in the second case, two sides of the long axis are respectively provided with N layers and N +1 layers, N is an even number, two sides of the long axis are respectively provided with every two layers which are oppositely folded, and the remaining layer at the top of one side is folded in a zigzag manner across the long axis, so that the thicknesses of the two sides of the long axis are the closest to the same;
in the third situation, the two sides of the long axis are respectively provided with M layers and M layers, wherein M is an odd number, each two layers are oppositely folded on the two sides of the long axis, and the uppermost residual layer on each side is folded downwards;
in the fourth situation, two sides of the long axis are respectively an M layer and an M +1 layer, wherein M is an odd number, each two layers on one side of the M layer are oppositely folded, and the rest layer on the top is folded downwards; each two layers of the M +1 layers except the uppermost two layers are oppositely folded, one layer positioned on the lower side of the uppermost two layers is downwards folded, and the other layer positioned on the upper side of the uppermost two layers is zigzag folded across the long axis;
folding the saccule 1 which is folded in the short axis direction to reach the target length in a zigzag manner along the long axis direction to enable the saccule to reach the target length in the long axis direction;
the auxiliary tool is used for zigzag folding, the auxiliary tool comprises a U-shaped frame 3 and two positioning latch rods, the length of each positioning latch rod is larger than the total width of two upright posts of the U-shaped frame 3, the end of the saccule 1 which is zigzag folded and is far away from the air nozzle 2 is arranged in the U-shaped frame 3, the first positioning latch rod 3-1 is used for pressing the saccule 1 by the U-shaped frame 3 at the side of the U-shaped frame 3 which is close to the air nozzle 2, then folding the balloon 1 at the far side of the first positioning latch rod 3-1 from the U-shaped frame 3, inserting the bent part to the other side of the U-shaped frame 3 from between two upright posts, inserting the second positioning latch rod 3-2 at the other side of the U-shaped frame 3 into the inner side of the bent part, and pulling the free end of the balloon 1 to enable the second positioning latch rod 3-2 to press the balloon 1 by the U-shaped frame 3 to complete a zigzag folding cycle; then the first positioning latch rod 3-1 is pulled out and presses part of the balloon 1 above the first positioning latch rod to carry out the next cycle of zigzag folding until the step of zigzag folding the balloon 1 along the long axis direction is completed;
so far, the sacculus 1 is folded into a cuboid, and the air nozzle 2 is leaned on the sacculus 1 after being disconnected with the vacuum pump.
The membrane 1-1 and the pole cap sheet 1-2 are made of three layers of PVDF (polyvinylidene fluoride) membrane, aluminum plating layer and polyimide film from outside to inside, wherein the PVDF membrane is named as polyvinylidene fluoride membrane; the outermost PVDF film has good mechanical property, good thermal stability and chemical stability, can be used within the temperature range of minus fifty ℃ to minus one hundred fifty ℃ without deformation, has good weather resistance and non-polarity, and is resistant to ultraviolet radiation, difficult to age, resistant to folding and abrasion and resistant to atomic oxygen; the middle aluminum-plated layer is used for preventing ultraviolet radiation; the polyimide film on the inner side has good high and low temperature resistance mechanical property and plays a role of a bearing layer and an airtight layer; the total thickness of the three layers is not more than two hundred micrometers, the thickness of the middle aluminum plating layer is not more than five micrometers, the increase of the overall hardness caused by overlarge thickness of the aluminum plating layer is avoided, the plastic deformation is not easy to recover, and the folding with small curvature is not facilitated.
Preferably, the circular clip 2-1 has a thickness of about three to five millimeters and a diameter of about thirty millimeters; the width of the polyimide single-sided adhesive 2-3 wound on the inner side part of the balloon 1 of the inflation catheter 2-2 is about thirty millimeters, and the winding number is about twenty-five circles.
Claims (2)
1. A multidirectional folding method for containing a cuboid of a flexible film inflatable sphere comprises the flexible film inflatable sphere (1) and an air nozzle (2), wherein the balloon (1) comprises spindle-shaped membranes (1-1) which surround a spherical shape and are arranged in multiple warp directions, the adjacent membranes (1-1) are bonded in a sealing way, two ends of all the membranes (1-1) are bonded through polar cap pieces (1-2), the air nozzle (2) is arranged at the central position of the polar cap piece (1-2) at one end of the air nozzle, and the air nozzle (2) only comprises a round clamping piece (2-1) made of a silicon rubber resin material and an inflatable guide tube (2-2) made of a sheet molding compound; a circumferential notch (2-1-1) is formed in the round clamping piece (2-1), so that the round clamping piece (2-1) is provided with a circumferential clamping part, a through hole for installing the air nozzle (2) is formed in the balloon (1), the diameter of the through hole for installing the air nozzle (2) is smaller than that of the round clamping piece (2-1), the round clamping piece (2-1) is arranged at the through hole, the circumferential clamping part of the round clamping piece (2-1) clamps the balloon (1), and the clamping parts are bonded; a jack for inserting the inflation catheter (2-2) is arranged on the round clamping piece (2-1), the inflation catheter (2-2) is inserted into the round clamping piece (2-1), the inflation catheter (2-2) is in interference fit with the corresponding jack, and polyimide single-sided adhesive (2-3) is wound on the inner side portion, located on the balloon (1), of the inflation catheter (2-2);
the method is characterized in that the multidirectional folding method for accommodating the cuboid comprises the following steps:
firstly, exhausting; exhausting the gas in the balloon (1) and keeping the gas exhausted state in the folding process;
secondly, finishing all the membranes (1-1) one by one according to the spindle shape of the membranes (1-1); firstly, arranging a first membrane (1-1-1), taking any membrane (1-1) of the deflated balloon (1) as the first membrane (1-1-1), flatly unfolding the first membrane (1-1-1) and placing the first membrane on a horizontal surface; then, second membranes (1-1-2) are arranged, the membranes (1-1) connected with any one of the two sides of the first membranes (1-1-1) are used as the second membranes (1-1-2), the second membranes (1-1-2) are folded along the long axis after being flatly unfolded, and the second membranes (1-1-2) are attached to the flatly unfolded first membranes (1-1-1); arranging a third membrane (1-1-3), taking the membrane (1-1) connected with the side which is not arranged in the two sides of the first membrane (1-1-1) as the third membrane (1-1-3), folding the third membrane (1-1-3) along the long axis after flatly expanding the third membrane, and pasting the third membrane on the flatly expanded first membrane (1-1-1); finishing a fourth membrane (1-1-4), taking the membrane (1-1) connected with the unfinished one of the two sides of the second membrane (1-1-2) as the fourth membrane (1-1-4), flatly unfolding the fourth membrane (1-1-4), folding the fourth membrane along the long axis, and pasting the fourth membrane on the second membrane (1-1-2); finishing a fifth membrane (1-1-5), taking the membrane (1-1) connected with the unfinished one of the two sides of the third membrane (1-1-3) as the fifth membrane (1-1-5), flatly unfolding the fifth membrane (1-1-5), folding the fifth membrane along the long axis, and pasting the fifth membrane on the third membrane (1-1-3); the remaining membranes (1-1) are sequentially arranged according to the spindle shape of the membranes (1-1) and the step of arranging all the membranes (1-1) one by one until the last membrane (1-1) is flatly unfolded, the whole balloon (1) is folded into a thickened membrane (1-1) shape, the two sides of the long axis of the thickened membrane (1-1) shaped balloon (1) are divided into a plurality of layers by the folded crease, each layer is formed by overlapping two half membranes (1-1) which are connected, and the number of the layers of the plurality of layers is four:
in the first case, N layers and N layers are respectively arranged on two sides of the long axis;
in the second case, the two sides of the long axis are respectively an N layer and an N +1 layer;
in the third case, the two sides of the long axis are respectively provided with an M layer and an M layer;
in the fourth case, the two sides of the long axis are respectively an M layer and an M +1 layer;
wherein N is an even number and M is an odd number;
thirdly, further folding the saccule (1) which is folded into the shape of the thickened membrane (1-1) along the short axis direction to enable the saccule to reach the target length in the short axis direction;
in the first case, two sides of the long axis are respectively provided with N layers and N layers, wherein N is an even number, and two sides of the long axis are respectively provided with two layers of opposite curls;
in the second case, two sides of the long axis are respectively provided with N layers and N +1 layers, N is an even number, two sides of the long axis are oppositely folded, and the remaining layer at the top of one side is folded in a zigzag manner across the long axis;
in the third situation, the two sides of the long axis are respectively provided with M layers and M layers, wherein M is an odd number, each two layers are oppositely folded at the two sides of the long axis, and the remaining layer at the top of each side is folded downwards;
in the fourth situation, two sides of the long axis are respectively an M layer and an M +1 layer, wherein M is an odd number, each two layers on one side of the M layer are oppositely folded, and the rest layer on the top is folded downwards; each two layers of the M +1 layer except the uppermost two layers are oppositely folded, one layer at the lower side of the uppermost two layers is folded downwards, and the other layer at the upper side is folded in a zigzag shape across the long axis;
and fourthly, folding the saccule (1) which is folded in the short axis direction to reach the target length in a zigzag manner along the long axis direction to enable the saccule to reach the target length in the long axis direction.
2. A method of multidirectional folding of a cuboid of flexible film inflatable balloons according to claim 1, characterized in that the zigzag folding is performed with an aid comprising a U-shaped frame (3) and two positioning bars, the length of which is greater than the total width of the two uprights of the U-shaped frame (3), the end of the balloon (1) that undergoes the zigzag folding that is distant from the air tap (2) is placed in the U-shaped frame (3), the balloon (1) is pressed by means of the first positioning bar (3-1) against the U-shaped frame (3) on the side of the U-shaped frame (3) that is close to the air tap (2), the balloon (1) on the side of the first positioning bar (3-1) that is distant from the U-shaped frame (3) is then folded and the bend is inserted from between the two uprights to the other side of the U-shaped frame (3), and the second positioning bar (3-2) is inserted on the other side of the U-shaped frame (3) inside the bend, the free end of the balloon (1) is pulled again to enable a second positioning bolt rod (3-2) to press the balloon (1) by means of the U-shaped frame (3) to complete a zigzag folding cycle; and then the first positioning latch rod (3-1) is pulled out and presses a part of the saccule (1) above the first positioning latch rod, and the next cycle of zigzag folding is carried out until the step of zigzag folding the saccule (1) along the long axis direction is completed.
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| CN115402534A (en) * | 2022-09-14 | 2022-11-29 | 中国科学院重庆绿色智能技术研究院 | Resistance-increasing sail and off-rail device for passive off-rail of space load |
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