Satellite camera multi-layer heat insulation assembly heat screen and installation method thereof

Abstract

The invention discloses a multi-layer heat insulation assembly heat screen of a camera for a satellite and an installation method of the multi-layer heat insulation assembly heat screen. The multi-layer heat insulation assembly heat screen is composed of two layers of aramid fiber wire frames and a multi-layer heat insulation assembly, a net-shaped structure formed by the aramid fiber wire frames on the two sides plays a role in supporting the multi-layer heat insulation assembly clamped in the middle, and the multi-layer heat insulation assembly heat screen is fixed to a structural plate of a load cabin bottom plate through aramid fiber wires and a nylon base. During installation, the 10-unit multi-layer heat insulation assembly is firstly manufactured; a lower layer aramid fiber line binding point position is selected on the structural plate, a lower layer aramid fiber line frame is arranged, and after the transverse tensioning force of the aramid fiber lines meets the requirement, adhesive dispensing is carried out at the binding position for anti-loose fixing; laying a plurality of layers of heat insulation assemblies, and sewing the lower layer aramid fiber threads and the plurality of layers of heat insulation assemblies together; an upper-layer aramid wire binding point position is selected on the structural plate, an upper-layer aramid wire frame is arranged, and after the transverse tensioning force of the aramid wires meets the requirement, adhesive dispensing is conducted on the binding position for looseness prevention and fixation; and finally, sewing the upper-layer aramid fiber threads and the multi-layer heat insulation assembly together.

Description

Technical Field

[0001] The present application relates to the technical field of satellite cameras, and in particular to a multi-layer thermal insulation assembly thermal insulation screen for a satellite camera and a method for installing the same. Background Art

[0002] Multilayer thermal insulation components are widely used in the development of various spacecraft structural plates and equipment to ensure that satellites and their equipment can operate normally in complex and harsh space thermal environments, to achieve temperature control of onboard instruments and equipment, structural components, and components inside and outside the cabin, and to ensure that the onboard temperature meets the satellite thermal control design requirements. The camera multilayer thermal insulation component thermal control insulation material is generally installed on the outer surface of the camera body to ensure that the camera temperature is reasonably controlled and meets the camera's working requirements in the space thermal environment. The general camera is installed on the bottom plate of the payload cabin. On the outer surface of the camera or the surface of the structural plate at the camera installation position, the prepared multilayer thermal insulation component thermal control insulation material is installed on the camera body and the structural plate using nylon buckle and GD414 vulcanized silicone rubber, and fixed firmly. However, the traditional installation method is only suitable for the installation of multilayer thermal insulation component thermal control insulation materials attached to the surface of the structure or the surface of the camera body, that is, the multilayer thermal insulation component thermal control insulation material can be directly pasted and fixed on the surface of the metal structure. When the camera is installed above the load-bearing cylinder or at a location with a large through-hole on the bottom plate of the load compartment, the thermal control insulation material of the multi-layer insulation assembly cannot be directly attached to the structure. However, in order to prevent heat backflow, it is still necessary to install the thermal control insulation material of the multi-layer insulation assembly in the air at the location of the large through-hole. Summary of the invention

[0003] The present application provides a multi-layer thermal insulation assembly heat shield for satellite cameras and an installation method thereof. In the scenario where this solution is applied, a large-payload camera is installed above the through hole on the bottom plate of the payload cabin of the entire satellite, and the thermal control and heat insulation material of the multi-layer thermal insulation assembly of the camera needs to be installed in mid-air. The present invention uses a suspended installation method at the upper end of the load-bearing cylinder and the middle opening of the bottom plate of the payload cabin to install the thermal control and heat insulation material of the multi-layer thermal insulation assembly of the camera, that is, the thermal insulation shield of the multi-layer thermal insulation assembly of the camera, and fix it firmly to ensure that it will not fall off during vibration tests and satellite launches.

[0004] In the first aspect, a multi-layer thermal insulation assembly heat shield for a satellite camera is provided, comprising a lower aramid wire frame, a multi-layer thermal insulation assembly and an upper aramid wire frame; the mesh structure composed of the lower aramid wire frame and the upper aramid wire frame supports the multi-layer thermal insulation assembly sandwiched in the middle; and the multi-layer thermal insulation assembly heat shield is fixed to the satellite structure using a nylon base.

[0005] In combination with the first aspect, in certain implementations of the first aspect, the lower aramid wire frame includes 6 lower aramid wires and 6 lower binding points;

[0006] The 6 lower aramid threads are respectively a first lower aramid thread, a second lower aramid thread, a third lower aramid thread, a fourth lower aramid thread, a fifth lower aramid thread and a sixth lower aramid thread;

[0007] The six lower layer lashing points are evenly distributed on the outer periphery of the lower layer aramid wire frame, and are respectively the first lower layer lashing point, the second lower layer lashing point, the third lower layer lashing point, the fourth lower layer lashing point, the fifth lower layer lashing point, and the sixth lower layer lashing point in the clockwise direction;

[0008] The upper aramid wire frame includes 6 upper aramid wires and 6 upper lashing points;

[0009] The six upper aramid threads are respectively a first upper aramid thread, a second upper aramid thread, a third upper aramid thread, a fourth upper aramid thread, a fifth upper aramid thread, and a sixth upper aramid thread; the first upper aramid thread is aligned with the first lower aramid thread, the second upper aramid thread is aligned with the second lower aramid thread, and the third upper aramid thread is aligned with the third lower aramid thread;

[0010] The 6 upper binding points are evenly distributed on the circumference of the upper aramid wire frame, and are the first upper binding point, the second upper binding point, the third upper binding point, the fourth upper binding point, the fifth upper binding point, and the sixth upper binding point in a clockwise direction; the first upper binding point is aligned with the first lower binding point, the second upper binding point is aligned with the second lower binding point, the third upper binding point is aligned with the third lower binding point, the fourth upper binding point is aligned with the fourth lower binding point, the fifth upper binding point is aligned with the fifth lower binding point, and the sixth upper binding point is aligned with the sixth lower binding point.

[0011] In combination with the first aspect, in some implementations of the first aspect, one end of the first lower layer aramid line is fixed at the first lower layer lashing point, and the other end of the first lower layer aramid line is fixed at the fourth lower layer lashing point; one end of the second lower layer aramid line is fixed at the second lower layer lashing point, and the other end of the second lower layer aramid line is fixed at the fifth lower layer lashing point; one end of the third lower layer aramid line is fixed at the third lower layer lashing point, and the other end of the third lower layer aramid line is fixed at the sixth lower layer lashing point; one end of the fourth lower layer aramid line is fixed at the second lower layer lashing point, and the other end of the fourth lower layer aramid line is fixed at the sixth lower layer lashing point; one end of the fifth lower layer aramid line is fixed at the fourth lower layer lashing point, and the other end of the fifth lower layer aramid line is fixed at the sixth lower layer lashing point; one end of the sixth lower layer aramid line is fixed at the second lower layer lashing point, and the other end of the sixth lower layer lashing point;

[0012] One end of the first upper layer aramid line is fixed at the first upper layer binding point, and the other end of the first upper layer aramid line is fixed at the fourth upper layer binding point; one end of the second upper layer aramid line is fixed at the second upper layer binding point, and the other end of the second upper layer aramid line is fixed at the fifth upper layer binding point; one end of the third upper layer aramid line is fixed at the third upper layer binding point, and the other end of the third upper layer aramid line is fixed at the sixth upper layer binding point; one end of the fourth upper layer aramid line is fixed at the first upper layer binding point, and the other end of the fourth upper layer aramid line is fixed at the third upper layer binding point; one end of the fifth upper layer aramid line is fixed at the first upper layer binding point, and the other end of the fifth upper layer aramid line is fixed at the fifth upper layer binding point; one end of the sixth upper layer aramid line is fixed at the third upper layer binding point, and the other end of the sixth upper layer aramid line is fixed at the fifth upper layer binding point.

[0013] In combination with the first aspect, in certain implementations of the first aspect, at a lower intersection point ① where the first lower aramid thread and the second lower aramid thread intersect, the first lower aramid thread, the second lower aramid thread and the multi-layer thermal insulation component are sewn together; at a lower intersection point ② where the second lower aramid thread and the third lower aramid thread intersect, the second lower aramid thread and the third lower aramid thread are sewn together with the multi-layer thermal insulation component; at a lower intersection point ③ where the third lower aramid thread and the first lower aramid thread intersect, the third lower aramid thread, the first lower aramid thread and the multi-layer thermal insulation component are sewn together. The first and fourth lower aramid threads are sewn together with the multi-layer heat insulation assembly; at the lower intersection point ④ where the first lower aramid thread and the fourth lower aramid thread intersect, the first lower aramid thread, the fourth lower aramid thread and the multi-layer heat insulation assembly are sewn together; at the lower intersection point ⑤ where the second lower aramid thread and the fifth lower aramid thread intersect, the second lower aramid thread and the fifth lower aramid thread are sewn together with the multi-layer heat insulation assembly; at the lower intersection point ⑥ where the third lower aramid thread and the sixth lower aramid thread intersect, the third lower aramid thread and the sixth lower aramid thread are sewn together with the multi-layer heat insulation assembly;

[0014] At the upper intersection point (1) where the first upper aramid thread and the second upper aramid thread intersect, the first upper aramid thread, the second upper aramid thread and the multi-layer heat insulation component are sewn together; the first upper intersection point (1) is aligned with the first lower intersection point (1); at the upper intersection point (2) where the second upper aramid thread and the third upper aramid thread intersect, the second upper aramid thread, the third upper aramid thread and the multi-layer heat insulation component are sewn together; the second upper intersection point (2) is aligned with the second lower intersection point (2); at the upper intersection point (3) where the third upper aramid thread and the first upper aramid thread intersect, the third upper aramid thread, the first upper aramid thread and the multi-layer heat insulation component are sewn together. The third upper intersection point (3) is aligned with the third lower intersection point (3); at the upper intersection point (4) where the first upper aramid thread and the fourth upper aramid thread intersect, the first upper aramid thread, the fourth upper aramid thread and the multi-layer thermal insulation component are sewn together; at the upper intersection point (5) where the second upper aramid thread and the fifth upper aramid thread intersect, the second upper aramid thread and the fifth upper aramid thread are sewn together with the multi-layer thermal insulation component; at the upper intersection point (6) where the third upper aramid thread and the sixth upper aramid thread intersect, the third upper aramid thread, the sixth upper aramid thread and the multi-layer thermal insulation component are sewn together.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the multi-layer thermal insulation component includes an outer film, an inner film and 10 layers of middle multi-layer thermal insulation component core material; except for the outer film and the inner film, each layer of the multi-layer thermal insulation component core material includes a layer of 6um double-sided aluminum-plated polyester perforated film and a layer of polyester mesh, and the outer film and the inner film are both a layer of double-sided aluminum-plated polyester film with a thickness of 18 to 25um; the mask is fixed to the inner and outer surfaces of the core material with double-sided tape, and is reinforced with silicone rubber at appropriate intervals; the size of the mask is 30 to 40mm larger than the size of the multi-layer thermal insulation component on each side, and the flange is firmly fixed with double-sided tape; a grounding device is provided on the multi-layer thermal insulation component for grounding connection after the multi-layer thermal insulation component is installed; nylon straps are pasted on each edge of the multi-layer thermal insulation component, and are fixedly installed corresponding to the nylon straps at corresponding positions on the structural plate of the bottom plate of the load compartment.

[0016] In a second aspect, a method for installing a multi-layer thermal insulation assembly heat shield for a satellite camera is provided, the installation method being used to install the multi-layer thermal insulation assembly heat shield as described in any one of the implementations of the first aspect above, the installation method comprising a method for installing a lower aramid wire frame, a method for laying a multi-layer thermal insulation assembly, and a method for installing an upper aramid wire frame.

[0017] In conjunction with the second aspect, in certain implementations of the second aspect, a method for installing a lower aramid wire frame includes:

[0018] On the outer structural plate of the upper surface of the load cabin bottom plate, 6 lower lashing points are evenly selected, and a nylon base is installed at each lower lashing point;

[0019] Fix the aramid wire of the lower aramid wire frame: tie a knot at the ear corner of the nylon base at the starting end, pull the aramid wire straight to the other end, wrap it around the ear corner of the nylon base at the other end, and fold it back in the original direction;

[0020] The tension of the lower layer aramid wire is tested. If the test is passed, glue is applied to the binding points of the 6 lower layer aramid wires and the corresponding nylon base ear corners to prevent them from loosening and fix them firmly.

[0021] In conjunction with the second aspect, in certain implementations of the second aspect, a quantitative evaluation method of the straightening state of the aramid line includes:

[0022] Use a digital tensioner to tighten the aramid line with a force of 15-20N to make the tightness of the line moderate; then use a marker to mark the corners of the aramid line and the nylon base;

[0023] Loosen the tensioner and continue to wrap the aramid line around the ear corner of the nylon base for 3 more turns. When tying the knot, align the markings on the rope with those on the ear corner of the nylon base, then tie it together with the line in the original direction to form a knot.

[0024] In combination with the second aspect, in certain implementations of the second aspect, the tension test of the lower aramid line is to measure the lateral tension, take a point from the center of each aramid line, pull it out parallel to the displacement d with a tensile gauge, observe and record the tension value T displayed on the tensile gauge 拉力 satisfy:

[0025]

[0026] F 张力 is the preset tensioning force of the aramid line in the tensioned state, L is the length of the aramid line after tensioning, and d is the pulling length after the dynamometer applies tension at the center of the aramid line perpendicular to the tensioning direction of the aramid line.

[0027] In combination with the second aspect, in certain implementations of the second aspect, any two aramid wires in the lower aramid wire frame cross to form a lower intersection point; in the method for laying the multi-layer thermal insulation assembly, each lower intersection point is fixed with a single-sided aluminum-plated polyester tape in order from the inside to the outside, and then the aramid wire at the lower intersection point is sewed together with the multi-layer thermal insulation assembly by making a cross with stainless steel wire;

[0028] Any two aramid wires in the upper aramid wire frame cross to form an upper intersection point; in the upper aramid wire frame installation method, each upper intersection point is fixed with a single-sided aluminum-coated polyester tape in order from the inside to the outside, and then the aramid wire at the upper intersection point is sewed together with the multi-layer insulation assembly by making a cross with stainless steel wire.

[0029] Compared with the prior art, the solution provided by this application includes at least the following beneficial technical effects:

[0030] (1) The present invention provides a method for manufacturing a heat insulation screen of a multi-layer heat insulation component of a camera device and installing it in a suspended manner, thereby solving the problem of installing a multi-layer heat insulation component without a fixed installation surface.

[0031] (2) After the aramid line is fixed at both ends, the longitudinal tension can generally no longer be measured. The present invention provides a method for measuring and verifying the tension of the aramid line. By converting it into measuring the lateral tension, the corresponding longitudinal tension during binding can be calculated, thereby judging whether the longitudinal tension meets the requirements and whether the aramid line is appropriately tight.

[0032] (3) The upper and lower layers of aramid wire frames are used to fix the middle multi-layer insulation assembly firmly. The fixing points are more flexible than the previous multi-layer insulation assembly fixing points. The fixing point positions can be flexibly adjusted according to different structural layouts, reducing the difficulty of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Installation diagram of the structure for the lower aramid wire frame.

[0034] Figure 2 This is the structural diagram for the upper aramid wire frame installation.

[0035] Figure 3 This is the tension analysis diagram of the aramid line. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Combination Figure 1 and Figure 2 The present invention provides a multi-layer heat insulation assembly heat shield for satellite cameras, comprising a lower aramid wire frame, a multi-layer heat insulation assembly and an upper aramid wire frame. The mesh structure composed of the lower aramid wire frame and the upper aramid wire frame supports the multi-layer heat insulation assembly sandwiched therebetween. The multi-layer heat insulation assembly heat shield can be fixed on a satellite structure by using a nylon base.

[0038] In some embodiments, the multi-layer insulation component is a multi-layer insulation component with 10 units of production layers, including an outer film, an inner film and 10 layers of middle multi-layer insulation component core material. In addition to the outer film and the inner film, each unit includes a layer of 6um double-sided aluminized polyester perforated film and a layer of polyester mesh. The outer film and the inner film are both a layer of double-sided aluminized polyester film with a thickness of 18 to 25um. The mask is fixed to the inner and outer surfaces of the core material with double-sided tape, and is reinforced with silicone rubber at appropriate intervals. The size of the mask is 30 to 40 mm larger than the size of the multi-layer insulation component on each side, and the flange is firmly fixed with double-sided tape. A grounding device is provided on the multi-layer insulation component for grounding connection after the multi-layer insulation component is installed. The grounding device is, for example, a grounding wire with an ear piece, which is riveted to the multi-layer insulation component by rivets. At the same time, nylon buckles (loops) are pasted on the edges of the multi-layer insulation assembly, and nylon buckles (hooks) are pasted on the corresponding positions of the outer structural plate on the upper surface of the load cabin bottom plate to fix and install the multi-layer insulation assembly of the heat insulation screen.

[0039] Figure 1 A schematic diagram of the structure of a lower aramid wire frame is shown. The lower aramid wire frame includes 6 lower aramid wires and 6 lower lashing points. The 6 lower aramid wires are respectively the first lower aramid wire 1, the second lower aramid wire 2, the third lower aramid wire 3, the fourth lower aramid wire 6, the fifth lower aramid wire 7, and the sixth lower aramid wire 8. The 6 lower lashing points are evenly distributed on the outer periphery of the lower aramid wire frame in the circumferential direction, and are respectively the first lower lashing point, the second lower lashing point, the third lower lashing point, the fourth lower lashing point, the fifth lower lashing point, and the sixth lower lashing point in the clockwise direction.

[0040] One end of the first lower layer aramid line 1 is fixed at the first lower layer lashing point, and the other end of the first lower layer aramid line 1 is fixed at the fourth lower layer lashing point. One end of the second lower layer aramid line 2 is fixed at the second lower layer lashing point, and the other end of the second lower layer aramid line 2 is fixed at the fifth lower layer lashing point. One end of the third lower layer aramid line 3 is fixed at the third lower layer lashing point, and the other end of the third lower layer aramid line 3 is fixed at the sixth lower layer lashing point. One end of the fourth lower layer aramid line 6 is fixed at the second lower layer lashing point, and the other end of the fourth lower layer aramid line 6 is fixed at the sixth lower layer lashing point. One end of the fifth lower layer aramid line 7 is fixed at the fourth lower layer lashing point, and the other end of the fifth lower layer aramid line 7 is fixed at the sixth lower layer lashing point. One end of the sixth lower layer aramid line 8 is fixed at the second lower layer lashing point, and the other end of the sixth lower layer aramid line 8 is fixed at the fourth lower layer lashing point.

[0041] At the lower intersection point ① where the first lower aramid thread 1 and the second lower aramid thread 2 intersect, the first lower aramid thread 1, the second lower aramid thread 2 and the multi-layer heat insulation assembly are sewn together. At the lower intersection point ② where the second lower aramid thread 2 and the third lower aramid thread 3 intersect, the second lower aramid thread 2 and the third lower aramid thread 3 are sewn together with the multi-layer heat insulation assembly. At the lower intersection point ③ where the third lower aramid thread 3 and the first lower aramid thread 1 intersect, the third lower aramid thread 3 and the first lower aramid thread 1 are sewn together with the multi-layer heat insulation assembly. At the lower intersection point ④ where the first lower aramid thread 1 and the fourth lower aramid thread 6 intersect, the first lower aramid thread 1, the fourth lower aramid thread 6 and the multi-layer heat insulation assembly are sewn together. At the lower intersection point ⑤ where the second lower aramid thread 2 and the fifth lower aramid thread 7 intersect, the second lower aramid thread 2 and the fifth lower aramid thread 7 are sewn together with the multi-layer heat insulation assembly. At the lower intersection point ⑥ where the third lower aramid thread 3 and the sixth lower aramid thread 8 intersect, the third lower aramid thread 3 and the sixth lower aramid thread 8 are sewn together with the multi-layer heat insulation assembly.

[0042] Figure 2 A schematic diagram of the structure of an upper aramid wire frame is shown. The upper aramid wire frame includes 6 upper aramid wires and 6 upper lashing points. The 6 upper aramid wires are respectively the first upper aramid wire 11, the second upper aramid wire 12, the third upper aramid wire 13, the fourth upper aramid wire 16, the fifth upper aramid wire 17, and the sixth upper aramid wire 18. The 6 upper lashing points are evenly distributed on the outer periphery of the upper aramid wire 1 frame in the circumferential direction, and are respectively the first upper lashing point, the second upper lashing point, the third upper lashing point, the fourth upper lashing point, the fifth upper lashing point, and the sixth upper lashing point in the clockwise direction. The first upper binding point is aligned with the aforementioned first lower binding point, the second upper binding point is aligned with the aforementioned second lower binding point, the third upper binding point is aligned with the aforementioned third lower binding point, the fourth upper binding point is aligned with the aforementioned fourth lower binding point, the fifth upper binding point is aligned with the aforementioned fifth lower binding point, and the sixth upper binding point is aligned with the aforementioned sixth lower binding point.

[0043] One end of the first upper aramid line 11 is fixed to the first upper layer tying point, and the other end of the first upper aramid line 11 is fixed to the fourth upper layer tying point. One end of the second upper aramid line 12 is fixed to the second upper layer tying point, and the other end of the second upper aramid line 12 is fixed to the fifth upper layer tying point. One end of the third upper aramid line 13 is fixed to the third upper layer tying point, and the other end of the third upper aramid line 13 is fixed to the sixth upper layer tying point. Therefore, the first upper aramid line 11 can be aligned with the aforementioned first lower layer aramid line 1, the second upper layer aramid line 12 can be aligned with the aforementioned second lower layer aramid line 2, and the third upper layer aramid line 13 can be aligned with the aforementioned third lower layer aramid line 3. One end of the fourth upper layer aramid line 16 is fixed to the first upper layer tying point, and the other end of the fourth upper layer aramid line 16 is fixed to the third upper layer tying point. One end of the fifth upper aramid line 17 is fixed to the first upper lashing point, and the other end of the fifth upper aramid line 17 is fixed to the fifth upper lashing point. One end of the sixth upper aramid line 18 is fixed to the third upper lashing point, and the other end of the sixth upper aramid line 18 is fixed to the fifth upper lashing point.

[0044] At the upper intersection point (1) where the first upper aramid thread 11 and the second upper aramid thread 12 intersect, the first upper aramid thread 11, the second upper aramid thread 12 and the multi-layer heat insulation assembly are sewn together. The first upper intersection point (1) can be aligned with the aforementioned first lower intersection point (1). At the upper intersection point (2) where the second upper aramid thread 12 and the third upper aramid thread 13 intersect, the second upper aramid thread 12, the third upper aramid thread 13 and the multi-layer heat insulation assembly are sewn together. The second upper intersection point (2) can be aligned with the aforementioned second lower intersection point (2). At the upper intersection point (3) where the third upper aramid thread 13 and the first upper aramid thread 11 intersect, the third upper aramid thread 13, the first upper aramid thread 11 and the multi-layer heat insulation assembly are sewn together. The third upper intersection point (3) can be aligned with the aforementioned third lower intersection point (3). At the upper intersection point (4) where the first upper aramid thread 11 and the fourth upper aramid thread 16 intersect, the first upper aramid thread 11 and the fourth upper aramid thread 16 are sewn together with the multi-layer heat insulation assembly. At the upper intersection point (5) where the second upper aramid thread 12 and the fifth upper aramid thread 17 intersect, the second upper aramid thread 12 and the fifth upper aramid thread 17 are sewn together with the multi-layer heat insulation assembly. At the upper intersection point (6) where the third upper aramid thread 13 and the sixth upper aramid thread 18 intersect, the third upper aramid thread 13 and the sixth upper aramid thread 18 are sewn together with the multi-layer heat insulation assembly.

[0045] The present invention also provides a method for installing a multi-layer thermal insulation component heat shield for a satellite camera, including a method for installing a lower aramid wire frame, a method for laying the multi-layer thermal insulation component, and a method for installing an upper aramid wire frame.

[0046] In the lower aramid wire frame installation method, the lower aramid wire frame needs to be installed on the bottom plate of the load cabin. The bottom plate of the load cabin is a hexagonal structure with a hole in the middle, the camera is installed above the bottom plate of the load cabin, and the multi-layer insulation assembly insulation screen covers the middle hole in the bottom plate of the load cabin as a whole. The lower aramid wire frame installation method includes the following steps.

[0047] Step 101, evenly select 6 aramid line lashing point positions (corresponding to the above 6 lower layer lashing points) on the outer structural plate of the upper surface of the load cabin bottom plate, and install a nylon base at each aramid line lashing point position.

[0048] In one embodiment, the distance between two opposite aramid line binding points is about 1200 mm.

[0049] In one embodiment, the nylon base is fixed by screws and prevented from loosening by anti-loosening glue.

[0050] Step 102, follow Figure 1 The lower aramid wire frame is arranged in the shape of a.

[0051] When fixing, the method of fixing each aramid line is: tie a knot at the ear corner of the nylon base at the starting end, pull the aramid line straight to the other end, wrap it around the ear corner of the nylon base at the other end, and fold it back in the original direction.

[0052] In order to quantitatively evaluate the straightening state of the aramid line, use a digital tensioner to tighten it with a force of 15-20N to make the aramid line moderately tight. Then use a marker to mark the ear corners of the aramid line and the nylon base (when tying the buckle later, align the marks on the rope and the ear corners of the nylon base). Loosen the tensioner, continue to wrap the aramid line around the ear corners of the nylon base for 3 turns, align the marks, and then tie it together with the line in the original direction to make a knot. A total of 6 aramid lines are fixed in the above method, visually and lightly flicked with fingers to preliminarily check the tightness (the line has been straightened).

[0053] Step 103, the tension of the lower aramid wire is tested. If the test is passed, 502 glue is applied to the binding places of the six lower aramid wires and the corresponding nylon base ear corners to prevent loosening and fix them firmly.

[0054] At this time, both ends of the aramid line are fixed, and the longitudinal tension can no longer be measured. In order to verify that after installation, under the condition of appropriate tightness, there can also be a quantitative inspection standard for tension, the transverse tension is measured instead. That is, after fixing, take a point from the center of each aramid line, pull it out parallel with a displacement of d = 10mm (measured by a steel ruler), observe and record the tension value displayed on the tension meter. According to the following theoretical conversion method,

[0055] like Figure 3 As shown in the figure, it is assumed that the tension of a certain aramid line is F. 张力The length of the tension is L. A tensile force gauge is used to apply a tensile force perpendicular to the tensioning direction of the aramid line at the center of the aramid line and pull the length d. At this time, the reading of the tensile force gauge is T 拉力 , at this time, the pulling angle of the aramid line is θ, then according to the force balance at the pulling point, we can know:

[0056]

[0057] When the aramid line is connected to two opposite nylon bases, the length of the tension is L = 1200mm.

[0058] Therefore, after the aramid line is tightened and fixed with a force of 15-20N, it is then stretched horizontally to a length of d=10mm. When the tension value displayed on the dynamometer is 0.5-0.66N, it proves that the aramid line is of moderate tightness and meets the requirements.

[0059] The method for laying a multi-layer heat insulation assembly may include: placing the prepared multi-layer heat insulation assembly on a lower aramid wire frame composed of 6 aramid wires, from inside to outside (according to Figure 1 The order of ①, ②, ③ intersections to ④, ⑤, ⑥ intersections is obtained by cross-stitching stainless steel wire at each intersection to sew the aramid wire and the multi-layer insulation assembly together. The edge of the multi-layer insulation assembly is sealed with single-sided aluminized polyester tape to the outer structural plate on the upper surface of the load compartment bottom plate.

[0060] The installation method of the upper aramid wire frame is similar to that of the lower aramid wire frame. Figure 2 Arrange the upper aramid wire frame in the shape of a 2-layer aramid wire frame. A total of 6 aramid wires (corresponding to the 6 upper aramid wires mentioned above) are fixed in accordance with the installation method of the lower aramid wire frame. Visually check the tightness (the wire has been stretched straight) by lightly flicking with fingers. Then, test the tension of the upper aramid wire. The tension test method of the upper aramid wire is similar to that of the lower aramid wire. When the tension of the upper aramid wire is tested and the horizontal stretching length d=10mm is reached and the tension value displayed on the tensile gauge is 0.5-0.66N, it proves that the aramid wire is of appropriate tightness and meets the requirements. Then, apply 502 glue to the binding places of the upper 6 aramid wires and the corresponding nylon base ear corners to prevent loosening and fix them firmly. Then, fix the multi-layer thermal insulation assembly to the upper aramid wire frame. The method for fixing the multi-layer thermal insulation assembly and the upper aramid wire frame is to, on the upper aramid wire net composed of 6 aramid wires, from the inside to the outside (according to Figure 2 In the order of (1), (2), (3) intersections to (4), (5), (6) intersections), use stainless steel wire to cross at each intersection to sew the aramid wire and the multi-layer insulation assembly together. At the position where the aramid wire contacts the multi-layer insulation assembly, a single-sided aluminized polyester tape is pasted at intervals for reinforcement (to make the aramid wire and the multi-layer insulation assembly fit better and become one).

[0061] The present invention provides a method for suspended installation of thermal control and thermal insulation materials of multi-layer thermal insulation components, which solves the problem of equipment thermal control implementation when the equipment is installed above the bearing cylinder or at a position with a large through hole on the bottom plate of the load cabin, and the thermal control and thermal insulation materials of the multi-layer thermal insulation components cannot be directly fixed on the equipment or structure. The method can be used for suspended installation of thermal control and thermal insulation materials of multi-layer thermal insulation components of all satellite equipment, structural plates, and mechanisms, thereby meeting the thermal control requirements of the equipment and structures, and will not fall off after vibration tests and satellite launches.

[0062] Example 1

[0063] When installing the heat shield of the multi-layer heat insulation assembly for the small satellite camera, the operation method is as follows:

[0064] 1) Make a multi-layer insulation component: According to the design requirements and dimensions of the multi-layer insulation component, make a multi-layer insulation component with 10 units. The 10-unit multi-layer insulation component consists of an outer film, an inner film and 10 layers of multi-layer insulation component core materials in the middle. Each unit in the middle consists of a layer of 6um double-sided aluminized polyester perforated film and a layer of polyester mesh. The outer film and the inner film are both a layer of double-sided aluminized polyester film with a thickness of 18 to 25um. The mask is fixed to the inner and outer surfaces of the core material with double-sided tape, and is reinforced with silicone rubber at appropriate intervals. The size of the mask is 30 to 40 mm larger than the size of the core material of the multi-layer insulation component on each side, and the flange is firmly fixed with double-sided tape. A grounding device is set on the multi-layer insulation component, and the grounding wire is connected to the grounding connection with the structure after the multi-layer insulation component is installed. At the same time, nylon buckles (loops) are sewn on each edge of the multi-layer insulation component.

[0065] 2) Use silicone rubber to stick Velcro (hooks) at the corresponding positions of the structural panels to fix the edges of the multi-layer insulation components at the edges of the structure after the heat insulation screen multi-layer insulation components are installed.

[0066] 3) Select 6 aramid wire binding points on the structural plate as symmetrically as possible, with the distance between two opposite aramid wire binding points being about 1200mm. Install nylon bases at the selected positions, a total of 6, and install screw points with MS anti-loosening glue to prevent loosening.

[0067] 4) According to the straight-line distance between each binding point, leave 30mm more on both sides, and lay down double strands, for a total of 12 strands, 24 strands.

[0068] 5) According to the attached Figure 2The shape requires the arrangement of the lower aramid wire frame, with a total of 6 aramid wires (aramid wire 1, aramid wire 2, aramid wire 3, aramid wire 6, aramid wire 7, aramid wire 8). When fixing, the method of fixing each aramid wire is: tie a knot at the ear corner of the nylon base at the starting end, straighten the aramid wire to the other end, wrap it around the ear corner of the nylon base at the other end, and fold it back in the original direction. In order to have a quantitative evaluation of the straightening state of the aramid wire, use a digital tensioner, tighten it with a force of 15-20N, and make the aramid wire moderately tight. Then use a marker to mark the aramid wire and the ear corner of the nylon base (when tying the knot later, align the mark on the rope with the ear corner of the nylon base). Loosen the tensioner, continue to wrap the aramid wire around the ear corner of the nylon base for 3 more times, align the mark, and then tie it together with the wire in the original direction, tie a knot, as attached Figure 3 A total of 6 aramid lines are fixed in the above method, and the tightness is preliminarily checked by visual inspection and light finger flicking (the line is stretched straight).

[0069] 6) Measure the lateral tension value of the lower layer of aramid wire: After the aramid wire is fixed, take a point from the center of each aramid wire, use a tensile gauge to pull it out 10mm in parallel (measured by a steel ruler), observe and record the lateral tension value displayed on the tensile gauge, and the reading is between about 0.5-0.66N to be qualified.

[0070] 7) Apply 502 glue to the binding points of the aramid line and the nylon base ear corners to prevent loosening.

[0071] 8) Laying multi-layer insulation components: Place the prepared multi-layer insulation components on the lower aramid wire net composed of 6 aramid wires, from inside to outside (attached Figure 1 At each intersection, use a layer of single-sided aluminized polyester tape to fix it, and then use stainless steel wire to cross-sew the aramid wire and the multi-layer insulation components together, as shown in the attached Figure 1 As shown, after sewing, cover the head of the stainless steel wire with a layer of single-sided aluminized polyester tape to avoid excess material.

[0072] 9) Use Velcro to fix the inner side of the edge of the multi-layer insulation assembly to the edge of the structural board, then apply GD414 silicone rubber for auxiliary fixation, and then use single-sided aluminized polyester tape to seal the outer side.

[0073] 10) Using the same method as in step 5), Figure 2 The shape of the upper aramid wire frame is arranged, with a total of 6 wires (aramid wire 11, aramid wire 12, aramid wire 13, aramid wire 16, aramid wire 17, aramid wire 18).

[0074] 11) Using the same method as in step 6), measure the lateral tension value of the upper aramid line. The reading is acceptable if it is between 0.5-0.66N.

[0075] 12) Apply 502 glue to the binding points of the aramid line and the nylon base ear corners to prevent loosening.

[0076] 13) On the upper aramid wire frame composed of 6 aramid wires, from inside to outside (attached Figure 2 In the middle, from the intersection of ⑴, ⑵, ⑶ to the intersection of ⑷, ⑸, ⑹, fix it with a layer of single-sided aluminized polyester tape at each intersection, and then use stainless steel wire to cross the aramid wire and sew the multi-layer insulation components together. After sewing, cover the head of the stainless steel wire with a layer of single-sided aluminized polyester tape to avoid excess material.

[0077] 14) At the position where the aramid wire contacts the multi-layer insulation component, a single-sided aluminized polyester tape is pasted at intervals for reinforcement, so that the aramid wire and the multi-layer insulation component can better fit together and become one. Finally, after the heat shield of the multi-layer insulation component of the small satellite camera is installed, as shown in the attached Figure 1 shown.

[0078] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A multi-layer heat insulation assembly heat shield for a satellite camera, characterized in that: It includes a lower aramid wire frame, a multi-layer thermal insulation component and an upper aramid wire frame; the mesh structure composed of the lower aramid wire frame and the upper aramid wire frame supports the multi-layer thermal insulation component sandwiched in the middle; and the thermal insulation screen of the multi-layer thermal insulation component is fixed on the star structure by a nylon base.

2. The multi-layer heat insulation assembly heat shield according to claim 1, characterized in that: The lower aramid wire frame includes 6 lower aramid wires and 6 lower lashing points; The six lower aramid threads are respectively a first lower aramid thread (1), a second lower aramid thread (2), a third lower aramid thread (3), a fourth lower aramid thread (6), a fifth lower aramid thread (7), and a sixth lower aramid thread (8); The six lower layer lashing points are evenly distributed on the outer periphery of the lower layer aramid wire frame, and are respectively the first lower layer lashing point, the second lower layer lashing point, the third lower layer lashing point, the fourth lower layer lashing point, the fifth lower layer lashing point, and the sixth lower layer lashing point in the clockwise direction; The upper aramid wire frame includes 6 upper aramid wires and 6 upper lashing points; The six upper aramid threads are respectively a first upper aramid thread (11), a second upper aramid thread (12), a third upper aramid thread (13), a fourth upper aramid thread (16), a fifth upper aramid thread (17), and a sixth upper aramid thread (18); the first upper aramid thread (11) is aligned with the first lower aramid thread (1), the second upper aramid thread (12) is aligned with the second lower aramid thread (2), and the third upper aramid thread (13) is aligned with the third lower aramid thread (3); The 6 upper binding points are evenly distributed on the circumference of the upper aramid line 1 frame, and are the first upper binding point, the second upper binding point, the third upper binding point, the fourth upper binding point, the fifth upper binding point, and the sixth upper binding point in a clockwise direction; the first upper binding point is aligned with the first lower binding point, the second upper binding point is aligned with the second lower binding point, the third upper binding point is aligned with the third lower binding point, the fourth upper binding point is aligned with the fourth lower binding point, the fifth upper binding point is aligned with the fifth lower binding point, and the sixth upper binding point is aligned with the sixth lower binding point.

3. The multi-layer heat insulation assembly heat shield according to claim 2, characterized in that: One end of the first lower aramid line (1) is fixed at the first lower lashing point, and the other end of the first lower aramid line (1) is fixed at the fourth lower lashing point; one end of the second lower aramid line (2) is fixed at the second lower lashing point, and the other end of the second lower aramid line (2) is fixed at the fifth lower lashing point; one end of the third lower aramid line (3) is fixed at the third lower lashing point, and the other end of the third lower aramid line (3) is fixed at the sixth lower lashing point; one end of the fourth lower aramid line (6) is fixed at the second lower lashing point, and the other end of the fourth lower aramid line (6) is fixed at the sixth lower lashing point; one end of the fifth lower aramid line (7) is fixed at the fourth lower lashing point, and the other end of the fifth lower aramid line (7) is fixed at the sixth lower lashing point; one end of the sixth lower aramid line (8) is fixed at the second lower lashing point, and the other end of the sixth lower aramid line (8) is fixed at the fourth lower lashing point; One end of the first upper aramid line (11) is fixed at the first upper lashing point, and the other end of the first upper aramid line (11) is fixed at the fourth upper lashing point; one end of the second upper aramid line (12) is fixed at the second upper lashing point, and the other end of the second upper aramid line (12) is fixed at the fifth upper lashing point; one end of the third upper aramid line (13) is fixed at the third upper lashing point, and the other end of the third upper aramid line (13) is fixed at the sixth upper lashing point; One end of the fourth upper aramid line (16) is fixed at the first upper layer tying point, and the other end of the fourth upper layer aramid line (16) is fixed at the third upper layer tying point; one end of the fifth upper layer aramid line (17) is fixed at the first upper layer tying point, and the other end of the fifth upper layer aramid line (17) is fixed at the fifth upper layer tying point; one end of the sixth upper layer aramid line (18) is fixed at the third upper layer tying point, and the other end of the sixth upper layer aramid line (18) is fixed at the fifth upper layer tying point.

4. The multi-layer heat insulation assembly heat shield according to claim 3, characterized in that: At the lower intersection point ① where the first lower aramid thread (1) and the second lower aramid thread (2) intersect, the first lower aramid thread (1), the second lower aramid thread (2) and the multi-layer heat insulation component are sewn together; at the lower intersection point ② where the second lower aramid thread (2) and the third lower aramid thread (3) intersect, the second lower aramid thread (2), the third lower aramid thread (3) and the multi-layer heat insulation component are sewn together; at the lower intersection point ③ where the third lower aramid thread (3) and the first lower aramid thread (1) intersect, the third lower aramid thread (3), the first lower aramid thread (1) and the multi-layer heat insulation component are sewn together; At the lower intersection point ④ where the first lower aramid thread (1) and the fourth lower aramid thread (6) intersect, the first lower aramid thread (1), the fourth lower aramid thread (6) and the multi-layer heat insulation component are sewn together; at the lower intersection point ⑤ where the second lower aramid thread (2) and the fifth lower aramid thread (7) intersect, the second lower aramid thread (2) and the fifth lower aramid thread (7) are sewn together with the multi-layer heat insulation component; at the lower intersection point ⑥ where the third lower aramid thread (3) and the sixth lower aramid thread (8) intersect, the third lower aramid thread (3) and the sixth lower aramid thread (8) are sewn together with the multi-layer heat insulation component; At the upper intersection point (1) where the first upper aramid thread (11) and the second upper aramid thread (12) intersect, the first upper aramid thread (11), the second upper aramid thread (12) and the multi-layer heat insulation component are sewn together; the first upper intersection point (1) is aligned with the first lower intersection point (1); at the upper intersection point (2) where the second upper aramid thread (12) and the third upper aramid thread (13) intersect, the second upper aramid thread (12), the third upper aramid thread (13) and the multi-layer heat insulation component are sewn together; the second upper intersection point (2) is aligned with the second lower intersection point (2); at the upper intersection point (3) where the third upper aramid thread (13) and the first upper aramid thread (11) intersect, the third upper aramid thread (13), the first upper aramid thread (11) and the multi-layer heat insulation component are sewn together. The third upper intersection point (3) is aligned with the third lower intersection point (3); at the upper intersection point (4) where the first upper aramid thread (11) and the fourth upper aramid thread (16) intersect, the first upper aramid thread (11), the fourth upper aramid thread (16) and the multi-layer thermal insulation component are sewn together; at the upper intersection point (5) where the second upper aramid thread (12) and the fifth upper aramid thread (17) intersect, the second upper aramid thread (12) and the fifth upper aramid thread (17) and the multi-layer thermal insulation component are sewn together; at the upper intersection point (6) where the third upper aramid thread (13) and the sixth upper aramid thread (18) intersect, the third upper aramid thread (13) and the sixth upper aramid thread (18) and the multi-layer thermal insulation component are sewn together.

5. The multi-layer heat insulation assembly heat shield according to any one of claims 1 to 4, characterized in that: The multi-layer thermal insulation component includes an outer film, an inner film and 10 layers of multi-layer thermal insulation component core materials in the middle; except for the outer film and the inner film, each layer of the multi-layer thermal insulation component core material includes a layer of 6um double-sided aluminum-plated polyester perforated film and a layer of polyester mesh, and the outer film and the inner film are both a layer of double-sided aluminum-plated polyester film with a thickness of 18 to 25um; the mask is fixed to the inner and outer surfaces of the core material with double-sided tape, and is reinforced with silicone rubber at appropriate intervals; the size of the mask is 30 to 40mm larger than the size of the multi-layer thermal insulation component on each side, and the flange is firmly fixed with double-sided tape; a grounding device is provided on the multi-layer thermal insulation component for grounding connection after the multi-layer thermal insulation component is installed; nylon straps are pasted on each edge of the multi-layer thermal insulation component, and are fixedly installed corresponding to the nylon straps at corresponding positions on the structural plate of the bottom plate of the load compartment.

6. A method for installing a heat shield of a multi-layer heat insulation assembly for a satellite camera, characterized in that: The installation method is used to install the multi-layer insulation assembly heat insulation screen according to any one of claims 1 to 5, and the installation method includes an installation method for a lower aramid wire frame, a laying method for a multi-layer insulation assembly, and an installation method for an upper aramid wire frame.

7. The installation method according to claim 6, characterized in that: The lower aramid wire frame installation method includes: On the outer structural plate of the upper surface of the load cabin bottom plate, 6 lower lashing points are evenly selected, and a nylon base is installed at each lower lashing point; Fix the aramid wire of the lower aramid wire frame: tie a knot at the ear corner of the nylon base at the starting end, pull the aramid wire straight to the other end, wrap it around the ear corner of the nylon base at the other end, and fold it back in the original direction; The tension of the lower layer aramid wire is tested. If the test is passed, glue is applied to the binding points of the 6 lower layer aramid wires and the corresponding nylon base ear corners to prevent them from loosening and fix them firmly.

8. The installation method according to claim 6, characterized in that: The quantitative evaluation methods for the straightening state of aramid yarn include: Use a digital tensioner to tighten the aramid line with a force of 15-20N to make the tightness of the line moderate; then use a marker to mark the corners of the aramid line and the nylon base; Loosen the tensioner and continue to wrap the aramid line around the ear corner of the nylon base for 3 more turns. When tying the knot, align the markings on the rope with those on the ear corner of the nylon base, then tie it together with the line in the original direction to form a knot.

9. The installation method according to claim 6, characterized in that: To test the tension of the lower aramid line, take a point from the center of each aramid line and pull it out parallel to the displacement d with a tensile gauge. Observe and record the tensile value T displayed on the tensile gauge. 拉力 satisfy: F 张力 is the preset tensioning force of the aramid line in the tensioned state, L is the length of the aramid line after tensioning, and d is the pulling length after the dynamometer applies tension at the center of the aramid line perpendicular to the tensioning direction of the aramid line.

10. The installation method according to claim 6, characterized in that: Any two aramid wires in the lower aramid wire frame cross to form a lower intersection point; in the method for laying the multi-layer thermal insulation assembly, a single-sided aluminum-plated polyester tape is used to fix each lower intersection point in order from the inside to the outside, and then a stainless steel wire is used to cross the aramid wire at the lower intersection point and sew it together with the multi-layer thermal insulation assembly; Any two aramid wires in the upper aramid wire frame cross to form an upper intersection point; in the upper aramid wire frame installation method, each upper intersection point is fixed with a single-sided aluminum-coated polyester tape in order from the inside to the outside, and then the aramid wire at the upper intersection point is sewed together with the multi-layer insulation assembly by making a cross with stainless steel wire.

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