Installation method of pointed cone rigid foam darkroom material suitable for extreme use environment

Abstract

The invention relates to an assembly technology of a foam darkroom material, in particular to an installation method of a pointed cone hard foam darkroom material suitable for an extreme use environment, and belongs to the field of material engineering. A steel wire barb method is adopted, a hole is drilled in the center of the bottom of a pointed cone hard foam darkroom material unit, then one end of a metal round rod is fixed to a bottom plate, and the other end of the metal round rod is loaded with a steel wire molded through mold pressing and inserted into the hole in the bottom of the hard foam darkroom material in a matched mode. The steel wires entering the holes play a rebound role, so that the ends of the metal round rods are embedded into the hard foam holes, barbs are formed for tight hooking, the pointed cone hard foam darkroom material units cannot move and rotate at will, and rapid and stable installation of the pointed cone hard foam darkroom material units is achieved. By means of the method, the hard foam darkroom material of the pointed cone structure can be tightly connected with the metal bottom plate, and the problem of large-batch installation of the foam darkroom material used in the extreme use environment can be effectively solved.

Description

Technical Field

[0001] The invention relates to an assembly technology of a foam darkroom material, in particular to an installation method of a pointed cone hard foam darkroom material suitable for extreme use environments, and belongs to the field of material engineering. Background Art

[0002] With the continuous development and progress of microwave electronic technologies such as antenna communication, electronic countermeasures, electromagnetic shielding, radar detection and stealth attack in military and civilian fields, it is particularly necessary to accurately test and evaluate the electromagnetic wave absorption or scattering state of the target, which requires the establishment of a microwave darkroom environment with extremely low scattering.

[0003] It is necessary to fill and install high-performance darkroom materials that absorb electromagnetic waves to form a microwave darkroom environment. In order to take into account the requirements of efficient absorption and lightweight, designing the darkroom material into a foamed cone structure is the only option. Foam cones of different sizes are designed according to different electromagnetic wave band requirements, and different absorbing components are used.

[0004] The darkroom materials currently in widespread use are still conventional darkroom materials. Considering the reduction of preparation costs, a cone-structured soft foam resin (such as polyether resin foam, polyurethane resin foam) is used as a precursor, and conventional darkroom materials are made by dipping and hanging absorbent slurry and curing. Conventional darkroom materials are suitable for room temperature environments. Adhesion of the cone foam to the base plate by gluing is a common installation method for conventional darkroom materials.

[0005] With the increasing competition in science and technology among the world's powerful countries, there are more and more tasks to detect target electromagnetic signals in various extreme use environments such as high temperature, ultra-low temperature, high vacuum, electric arc, strong particle irradiation, high-power antenna radiation, etc. For this reason, Chinese scientific and technological personnel have developed a variety of special conical foam darkroom materials suitable for extreme use environments, such as: conical carbon foam darkroom materials, conical silicon carbide foam darkroom materials, conical cyanate resin foam darkroom materials, conical polyimide resin foam darkroom materials, conical phenolic resin foam darkroom materials, etc. The matrix of the above foam darkroom materials suitable for extreme use environments is hard foam material, collectively referred to as conical hard foam darkroom materials.

[0006] The conventional adhesive installation method of darkroom materials is not suitable for hard foam darkroom materials in extreme use environments. On the one hand, under large temperature changes, the hard foam darkroom material will fall off due to the large difference in expansion coefficient between the hard foam darkroom material and the base plate; on the other hand, high temperature, ultra-low temperature, arc or high-energy particle radiation will damage the adhesive, making the adhesive effect ineffective. At present, the main method used to install darkroom materials in extreme use environments is the slide method, that is, install a slide plate on the base plate, process grooves on both sides of the bottom of the conical darkroom material, and slide the darkroom materials into the slide plate one by one through the cooperation of the grooves at the bottom of the darkroom material and the slide plate to complete the installation. Although the chute method basically solves the installation problem of darkroom materials in extreme use environments, this method not only has a high installation cost but also has two major drawbacks: first, when the foam holes of the darkroom material are large, the processed grooves are difficult to stably cooperate with the chute plate, and the chute method itself cannot tightly fix the darkroom material on the base plate, so when the base plate moves or rotates, the loose darkroom material is very likely to be damaged or fall off due to collision; second, it is very troublesome to replace the damaged darkroom material after sales, because other darkroom materials on the same chute plate need to be slid out, and the base plate may even need to be disassembled. For this reason, it is necessary to further develop a new method for installing the cone-structured rigid foam darkroom material in extreme use environments. Summary of the invention

[0007] The purpose of the present invention is to provide an installation method for a pointed cone rigid foam darkroom material suitable for extreme use environments. This method can tightly connect the pointed cone rigid foam darkroom material with a metal base plate, and can effectively solve the problem of mass installation of foam darkroom materials for extreme use environments.

[0008] The technical solution of the present invention is:

[0009] A method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments is characterized in that a wire barb method is used, a hole is first drilled in the center of the bottom of the pointed cone rigid foam darkroom material unit, and then one end of a metal round rod is fixed to a base plate, and the other end of the metal round rod is loaded with a molded steel wire, which is inserted into the hole at the bottom of the pointed cone rigid foam darkroom material unit. The steel wire entering the hole plays a rebound role so that the end of the metal round rod is embedded in the rigid foam hole, forming a barb to hook it tightly, so that the pointed cone rigid foam darkroom material unit cannot move and rotate arbitrarily, thereby achieving its rapid and stable installation.

[0010] The installation method of the pointed cone hard foam darkroom material suitable for extreme use environment is to first fix the metal round rod on the bottom plate, and then tightly connect the pointed cone hard foam darkroom material unit with the metal round rod by the wire barb method. The specific installation process is as follows:

[0011] (1) Drilling holes on the bottom plate

[0012] Based on the installation idea that the top of the pointed cone rigid foam darkroom material unit faces the electromagnetic wave, and the bottom is fixed to the bottom plate with the help of wire hooks and metal round rods, it is necessary to comprehensively consider the structural size and weight of the pointed cone rigid foam darkroom material unit, design the number and size of the metal round rods, and then determine the position distribution and size of the installation holes to be drilled on the bottom plate. The bottom plate is a metal plate, and the drilled holes are flat-bottomed internal thread holes. The major diameter D of the internal thread is required to be 4mm to 20mm, and the hole depth H1 is required to be 3mm to 15mm;

[0013] (2) Drilling of the Cone Hard Foam Darkroom Material Unit

[0014] Based on the number and size of the metal round rods, a carbide drill is used to drill a hole in the center of the bottom of each conical hard foam darkroom material unit, with a hole diameter of D and a hole depth H2 of 15mm to 100mm;

[0015] (3) Molding of steel wire

[0016] The length of the steel wire is 15mm to 70mm, and the diameter d1 of the steel wire is 0.3mm to 2mm. The steel wire is firstly pressed by a mold to be shaped into a middle arc shape with both ends moderately turned outward. The eversion angle α is required to be 30° to 45°, and the length of the eversion end part is 1mm to 6mm.

[0017] (4) Design and processing of metal round rods

[0018] First, each metal bar is integrated into a thick and thin cylinder, wherein: the thick cylinder has a diameter of D and a length of H1, and is further processed into a screw rod with an external thread major diameter of D, which is matched with the internal thread on the bottom plate to form a turnbuckle; the thin cylinder has a diameter of d2 and a length of H2, and the end of the thin cylinder is further processed into a conical end, the height of the conical end is 2mm to 5mm, and is matched with the conical part of the bottom drilling hole of the pointed cone hard foam darkroom material unit; two loading holes are drilled in the radial direction of the thin cylinder for loading steel wire, the two loading holes are orthogonal and interpenetrating, the hole diameters are both 2 to 4 times the steel wire diameter d1, the center of the loading hole is 0.5mm to 3mm away from the bottom of the cone, and is as close to the end of the thin cylinder as possible;

[0019] (5) Loading of shaping wire

[0020] First, fasten all the metal round bars vertically to the base plate through the screw buckles, and then alternately pass the shaping steel wires through the two orthogonal loading holes of each metal round bar. Each mounted shaping steel wire should be placed symmetrically on both sides of the thin cylinder as much as possible, and the arc-shaped mouth of the shaping steel wire should face the direction of the installation base plate;

[0021] (6) Installation of the Cone Hard Foam Darkroom Material Unit

[0022] Each pointed cone rigid foam darkroom material unit is inserted into the bottom hole in conjunction with the thin cylindrical part of the metal round rod, and stopped when it is close to the bottom plate. The steel wire entering the hole plays a rebound role so that its outward-turned and shaped end can be embedded in the foam hole, forming a barb to hook the darkroom material tightly, thereby achieving rapid and stable installation of the pointed cone rigid foam darkroom material unit.

[0023] The invention discloses a method for installing a pointed cone hard foam darkroom material suitable for extreme use environments. The pointed cone hard foam darkroom material unit used is a quadrangular pyramid structure with a square bottom surface, and adopts silicon carbide-based foam darkroom material, carbon-based foam darkroom material, cyanate resin-based foam darkroom material, polyimide resin-based foam darkroom material or phenolic resin-based foam darkroom material.

[0024] The installation method of the pointed cone hard foam darkroom material suitable for extreme use environment uses a metal round rod material selected from aluminum alloy, bronze, carbon steel or stainless steel.

[0025] The installation method of the pointed cone hard foam darkroom material suitable for extreme use environment uses carbon steel or stainless steel as the steel wire material.

[0026] The invention discloses a method for installing a conical hard foam darkroom material suitable for extreme use environments. The steel wire is shaped by applying pressure to a mold. The arc-shaped design in the middle enables the steel wire to be symmetrically mounted on both sides of a metal round rod. The outward-turned design at both end portions ensures that the ends of the steel wire are fully embedded in the foam holes when the steel wire rebounds, thereby forming barbs that can hook the darkroom material.

[0027] The installation method of the pointed cone hard foam darkroom material suitable for extreme use environment is as follows: the thin cylindrical part of the metal round rod is inserted into the bottom hole of the pointed cone hard foam darkroom material unit, and the diameter d2 of the thin cylinder is smaller than the diameter D of the hole.

[0028] The invention discloses an installation method for a pointed cone hard foam darkroom material suitable for extreme use environments. The method adopts an orthogonal and interpenetrating design of two steel wire loading holes, so that the steel wires are radially dispersed in the metal round rod to increase the force of the barb. The number of steel wires loaded orthogonally is controlled to be 2 to 6, and the number of steel wires in each loading hole is 1 to 3. When the number of steel wires loaded in each loading hole exceeds 2, the steel wires are arranged in sequence in the horizontal direction.

[0029] The installation method of the pointed cone hard foam darkroom material suitable for extreme use environment is described, the radial size of the metal round rod thin cylinder plus the steel wire is smaller than the bottom hole diameter of the pointed cone hard foam darkroom material unit: 2×d1+d2<D, d1 is the steel wire diameter, D is the hole diameter, and d2 is the thin cylinder diameter.

[0030] The design concept of the present invention is:

[0031] The present invention aims at the installation problem of the pointed cone structure hard foam darkroom material in extreme use environment. In view of the disadvantages of the currently mainly used gluing method, which has poor adaptability to extreme use environment, and the slide groove method, which has the disadvantages that the darkroom material is unstable and easy to be damaged, and the damaged parts are troublesome to replace, a new feasible installation method is proposed, namely: the wire hook method.

[0032] The specific design idea of ​​the wire hook method proposed in the present invention is: one end of the metal round rod is fastened to the bottom plate through a threaded port, and the other end is loaded with a shaping steel wire, which is inserted into the bottom hole of the hard foam darkroom material. The steel wire entering the hole plays a rebound role so that its end is embedded in the foam hole, forming a barb to hook the darkroom material tightly, thereby realizing the rapid and stable installation of the pointed cone hard foam darkroom material. The key to this design idea is the reasonable coordination of the steel wire and the bottom hole of the pointed cone hard foam darkroom material. First, under the premise of meeting the mechanical stability of the material insertion, the radial size of the metal round rod plus the steel wire is controlled to be lower than the diameter of the bottom hole of the pointed cone hard foam darkroom material to avoid squeezing the darkroom material during the insertion process; second, the steel wire needs to be shaped, mainly to ensure that the insertion process of the pointed cone hard foam darkroom material is smooth and the end of the rebound steel wire can be immediately and effectively embedded in the foam hole at the end, so that the pointed cone hard foam darkroom material cannot move and rotate arbitrarily, and realize its tight connection with the metal round rod and the bottom plate.

[0033] The electromagnetic wave absorption performance of the pointed cone rigid foam darkroom material of the present invention will not be deteriorated after the metal round rod is inserted at the bottom, for the following reasons: (1) The darkroom material with a pointed cone structure mainly absorbs the incident electromagnetic wave by multiple scattering, and the inserted metal round rod is located in the bottom area of ​​the darkroom material, and the amount of electromagnetic waves that may reach it is very small; (2) The very small amount of electromagnetic waves that may reach the metal round rod will also be scattered, and then enter the darkroom material and be absorbed, and will not be reflected back from the darkroom material. In addition, the closer the metal round rod is to the top of the pointed cone darkroom material, the greater the possibility of "touching" the incident electromagnetic wave. In order to more effectively scatter and absorb electromagnetic waves, the end of the metal round rod inserted into the darkroom material is processed into a cone structure.

[0034] The present invention has the following advantages and beneficial effects:

[0035] 1. Solved the feasibility of installing the cone-shaped rigid foam darkroom material in extreme use environments

[0036] The wire barb method adopted by the present invention is a design and installation that is completely carried out using metal structural parts. The metal structural parts have a strong tolerance to various extreme use environments, which is beyond the reach of all organic and inorganic adhesive materials. The metal round rods and steel wire installation materials used in the wire barb method are low in cost, and the metal round rod machining and steel wire molding processes are mature, which can achieve low-cost batch processing and preparation. The insertion process of the wire barb method can effectively embed the wire ends into the foam holes, so that the pointed cone hard foam darkroom material cannot move and rotate arbitrarily, which not only ensures the tight connection between the pointed cone hard foam darkroom material and the metal round rod, but also avoids the loosening of the screw buckle between the metal round rod and the base plate. In short, the present invention adopts the wire barb method to install the pointed cone hard foam darkroom material, which can solve the problems of extreme use environment applicability and stability of the installation structure, and is feasible.

[0037] 2. Realize the rapid installation and replacement of the cone-shaped hard foam darkroom material in extreme use environment

[0038] The wire hook method adopted by the present invention is a plug-in assembly concept, and this one-step plug-in operation realizes the rapid installation of each pointed cone hard foam darkroom material. When the pointed cone hard foam darkroom material installed by the wire hook method is damaged during use and needs to be replaced, it is only necessary to pull out the damaged pointed cone hard foam darkroom material with force, hang a new shaping steel wire on the metal round rod, and then insert the new pointed cone hard foam darkroom material. In comparison, the commonly used gluing method and the slide trough method are not as fast in installation and simple in after-sales replacement as the wire hook method.

[0039] In summary, the present invention provides an installation method for a pointed cone rigid foam darkroom material suitable for extreme use environments, namely, the wire barb method. The wire barb method for installing a pointed cone rigid foam darkroom material can solve the problems of applicability in extreme use environments and stability of the assembly structure, and can achieve rapid installation and simple replacement of the darkroom material. The wire barb method has broad application prospects in the field of rigid foam darkroom material assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1-Figure 2 The overall structure of the pointed cone hard foam darkroom material ( Figure 1 ) and axial section ( Figure 2 ) schematic diagram.

[0041] In the figure, 1 is a pointed cone hard foam darkroom material unit, and 2 is a hole.

[0042] Figure 3 It is a schematic diagram of molded steel wire. In the figure, 3 is the end part and 4 is the middle arc part.

[0043] Figure 4 It is a schematic diagram of a metal round rod. In the figure, 5 is a thick cylinder with threads, 6 is a thin cylinder, 7 is a loading hole, and 8 is a conical end.

[0044] Figure 5 The schematic diagram of the metal round rod loaded with two molded shaping steel wires is shown in FIG. 9 , the shaping steel wires and 10 , the metal round rod.

[0045] Figure 6-Figure 7 The process of inserting metal round rod into the cone rigid foam darkroom material ( Figure 6 ) and end( Figure 7 ) status diagram. DETAILED DESCRIPTION

[0046] like Figure 1 to Figure 7 As shown, in the specific implementation process, the present invention proposes an installation method for a pointed cone hard foam darkroom material suitable for extreme use environments, firstly fixing a metal round rod on a bottom plate, and then closely connecting the pointed cone hard foam darkroom material unit with the metal round rod by a wire barb method. The specific installation process is as follows:

[0047] (1) Drilling holes on the bottom plate

[0048] Based on the installation idea that the top of the pointed cone rigid foam darkroom material unit faces the electromagnetic wave, and the bottom is fixed to the bottom plate with the help of wire hooks and metal round rods, it is necessary to comprehensively consider the structural size and weight of the pointed cone rigid foam darkroom material unit, design the number and size of the metal round rods, and then determine the position distribution and size of the installation holes to be drilled on the bottom plate. The bottom plate is a metal plate, and the drilled holes are flat-bottomed internal thread holes. The major diameter D of the internal thread is required to be 4mm to 20mm, and the hole depth H1 is required to be 3mm to 15mm;

[0049] (2) Drilling of the Cone Hard Foam Darkroom Material Unit

[0050] like Figure 1-Figure 2 As shown, based on the number and size design of the metal round rods, a carbide drill is used to drill a hole in the center of the bottom of each pointed cone hard foam darkroom material unit 1, the hole diameter of the hole 2 is D, the hole depth H2 of the hole 2 is required to be 15mm to 100mm, and the upper end of the hole 2 is conical;

[0051] (3) Molding of steel wire

[0052] like Figure 3 As shown, the steel wire length is 15mm-70mm, the steel wire diameter d1 is 0.3mm-2mm, and the steel wire is firstly shaped into a shape in which the middle arc portion 4 and the two end portions 3 are moderately turned outward by applying pressure to the mold, the eversion angle α (the angle at the corresponding connection between the end portion 3 and the middle arc portion 4) is required to be 30°-45°, and the length of the turned outward end portion is 1mm-6mm;

[0053] (4) Design and processing of metal round rods

[0054] like Figure 4As shown, each metal bar is firstly integrated into a thick and thin cylinder, wherein: the thick cylinder has a diameter of D and a length of H1, and is further processed into a screw rod (threaded thick cylinder 5) with an external thread major diameter of D, which is matched with the internal thread on the bottom plate to form a turnbuckle; the thin cylinder 6 has a diameter of d2 and a length of H2, and the end of the thin cylinder is further processed into a conical end 8, the height of the conical end is required to be 2mm to 5mm, and it matches the conical part of the upper end of the bottom drilling hole of the pointed cone hard foam darkroom material unit; two loading holes 7 are drilled in the radial direction of the thin cylinder 6 for loading steel wire, and the two loading holes 7 are orthogonally intersecting, and the hole diameters of the loading holes 7 are both 2 to 4 times the diameter of the steel wire d1, and the center of the loading hole is 0.5mm to 3mm away from the cone bottom of the conical end 8, as close as possible to the upper end of the thin cylinder 6;

[0055] (5) Loading of shaping wire

[0056] like Figure 4-Figure 5 As shown, first, all the metal round rods 10 are vertically fastened to the bottom plate by screw buckles, and then the shaping wires 9 are alternately passed through the two orthogonal loading holes 7 of each metal round rod 10, and each mounted shaping wire 9 is placed symmetrically on both sides of the thin cylinder 6 as much as possible, and the arc-shaped mouth of the shaping wire 9 faces the direction of the installation bottom plate;

[0057] (6) Installation of the Cone Hard Foam Darkroom Material Unit

[0058] like Figure 6-Figure 7 As shown, each pointed cone rigid foam darkroom material unit is inserted into the bottom hole in cooperation with the thin cylindrical part of the metal round rod, and stops when it is close to the bottom plate. The steel wire entering the hole plays a rebound role so that its outward-turned and shaped end can be embedded in the foam hole, forming a barb to hook the darkroom material tightly, thereby realizing the rapid and stable installation of the pointed cone rigid foam darkroom material unit.

[0059] Among them, the steel wire is shaped by applying pressure to the mold. On the one hand, the appropriate arc design can make the steel wire symmetrically mounted on both sides of the metal round rod. On the other hand, the end part of the outward design can ensure that the end of the steel wire is fully embedded in the foam hole when the steel wire rebounds, forming a barb that can hook the darkroom material. The thin cylindrical part of the metal round rod is inserted into the bottom hole of the pointed cone hard foam darkroom material unit, and the diameter of the inserted cylinder is smaller than the diameter of the hole (d2<D). Its function is to avoid the large difference in thermal expansion coefficients between the inserted metal cylinder and the pointed cone hard foam darkroom material unit during use, causing damage to the latter. Two steel wire loading holes are designed orthogonally and interpenetratingly, and their function is to disperse the steel wire radially in the metal round rod and increase the barb force; the number of steel wires loaded alternately orthogonally is controlled to be 2 to 6, and the number of steel wires in each loading hole is 1 to 3. When the number of steel wires loaded in each loading hole exceeds 2, the steel wires are arranged in sequence in the horizontal direction, and no upper and lower stacking is allowed when placing the steel wires. The radial dimension of the metal round rod thin cylinder plus the steel wire is smaller than the bottom hole diameter of the pointed cone hard foam darkroom material unit (2×d1+d2<D, d1 steel wire diameter, D hole diameter, d2 thin cylinder diameter). Its function is to ensure the force of the steel wire hook and avoid the steel wire squeezing the darkroom material during the insertion process of the thin cylinder.

[0060] The present invention is further illustrated below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0061] Example 1

[0062] In this embodiment, in order to install the pointed cone carbon foam darkroom material units (regular tetrahedron) with a bottom side length of 60mm×60mm, a height of 100mm, and a weight of 0.108Kg in batches, first drill flat-bottomed internal thread holes with a hole depth of 5mm (H1) and a large diameter of 6mm (D) on the aluminum alloy bottom plate at intervals of 60mm, and then use a carbide drill to drill a hole centered at the bottom of each pointed cone carbon foam darkroom material unit with a hole diameter of 6mm (D) and a hole depth of 35mm (H2). The batch of stainless steel wires with a length of 24mm and a diameter of 0.5mm (d1) are shaped into a shape with an arc in the middle and two ends turned outward at an angle of 40° (α) by pressing the mold, and the length of the turned-out end portion is 1.5mm. Aluminum alloy rods are used to process aluminum alloy round rods for fixing the pointed cone carbon foam darkroom material unit. Each aluminum alloy rod is integrated into a screw rod (thick cylinder with thread) and a thin cylinder. The screw rod part has a large diameter of 6mm (D) and a length of 5mm (H1). The thin cylinder has a diameter of 4.5mm (d2) and a length of 35mm (H2). The end of the thin cylinder is further processed into a conical end with a height of 2mm. Two orthogonal and interpenetrating loading holes with a diameter of 1mm are drilled 1mm away from the bottom of the cone. All aluminum alloy round rods are vertically fastened to the aluminum alloy base plate through turnbuckles. Two stainless steel shaping wires are orthogonally mounted in the two orthogonal loading holes of each aluminum alloy round rod. Each mounted stainless steel shaping wire is placed as symmetrically as possible on both sides of the thin cylinder, and the arc mouth of each stainless steel shaping wire faces the direction of installing the aluminum alloy base plate. Insert each pointed cone carbon foam darkroom material unit with the bottom hole matching the thin cylindrical part of the aluminum alloy round rod, and stop when it is close to the aluminum alloy bottom plate to complete the installation.

[0063] In this embodiment, when the insertion process stops, the stainless steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the carbon foam hole, forming a barbed hook to tighten the pointed cone carbon foam darkroom material unit, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0064] Example 2

[0065] In this embodiment, in order to install the pointed cone silicon carbide foam darkroom material units (regular tetrahedrons) with a bottom side length of 50mm×50mm, a height of 70mm, and a weight of 0.08Kg in batches, first drill flat-bottomed internal thread holes with a hole depth of 4mm (H1) and a large diameter of 6mm (D) on the carbon steel bottom plate at intervals of 50mm, and then use a carbide drill to drill holes centered at the bottom of each pointed cone silicon carbide foam darkroom material with a hole diameter of 6mm (D) and a hole depth of 25mm (H2). The batch of carbon steel wires with a length of 24mm and a diameter of 0.4mm (d1) are shaped into a shape with an arc in the middle and two ends turned outward at an angle of 45° (α) by pressing the mold, and the length of the turned-out end portion is 1.5mm. Aluminum alloy rods are used to process aluminum alloy round rods for fixing the conical silicon carbide foam darkroom material. Each aluminum alloy rod is integrated into a screw rod and a thin cylinder. The screw rod has a large diameter of 6mm (D) and a length of 4mm (H1). The thin cylinder has a diameter of 5mm (d2) and a length of 25mm (H2). The end of the thin cylinder is further processed into a conical end with a height of 2mm. Two orthogonal and interpenetrating loading holes with a diameter of 1mm are drilled at a distance of 0.5mm from the bottom of the cone. All aluminum alloy round rods are vertically fastened to the carbon steel base plate through turnbuckles. Two carbon steel shaping wires are orthogonally mounted in the two orthogonal loading holes of each aluminum alloy round rod. Each mounted carbon steel shaping wire is placed as symmetrically as possible on both sides of the thin cylinder, and the arc mouth of each carbon steel shaping wire faces the direction of installing the carbon steel base plate. Insert each pointed cone silicon carbide foam darkroom material into place through the bottom hole and into the thin cylindrical part of the aluminum alloy round rod, and stop when it is close to the carbon steel bottom plate to complete the assembly.

[0066] In this embodiment, when the insertion process stops, the carbon steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the silicon carbide foam hole, forming a barbed hook to tighten the pointed cone silicon carbide foam dark chamber material, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0067] Example 3

[0068] In this embodiment, in order to install the pointed cone phenolic resin foam darkroom material units (regular tetrahedrons) with a bottom side length of 200mm×200mm, a height of 400mm, and a weight of 2.4Kg in batches, firstly, flat-bottomed internal threaded holes with a hole depth of 15mm (H1) and a major diameter of 20mm (D) are drilled on the stainless steel bottom plate at intervals of 200mm, and then a carbide drill is used to drill a hole centered at the bottom of each pointed cone phenolic resin foam darkroom material with a hole diameter of 20mm (D) and a hole depth of 100mm (H2). The batch of stainless steel wires with a length of 70mm and a diameter of 1.5mm (d1) are shaped into a shape with an arc in the middle and two ends turned outward at an angle of 30° (α) by pressing the mold, and the length of the turned outward end portion is 5mm. Stainless steel rods are used to process stainless steel round rods for fixing the conical phenolic resin foam darkroom material. Each stainless steel rod is integrated into a screw rod and a thin cylinder. The screw rod has a large diameter of 20mm (D) and a length of 15mm (H1). The thin cylinder has a diameter of 16.5mm (d2) and a length of 100mm (H2). The end of the thin cylinder is further processed into a conical end with a height of 5mm. Two orthogonal and interpenetrating loading holes with a diameter of 5mm are drilled 3mm away from the bottom of the cone. All stainless steel round rods are fastened vertically to the stainless steel base plate through turnbuckles. Six stainless steel shaping wires are alternately orthogonally mounted in the two orthogonal loading holes of each stainless steel round rod. Each mounted stainless steel shaping wire is placed as symmetrically as possible on both sides of the thin cylinder, and the arc mouth of each stainless steel shaping wire faces the direction of installing the stainless steel base plate. Insert each conical phenolic resin foam darkroom material into place through the bottom hole and into the thin cylindrical part of the stainless steel round rod, and stop when it touches the stainless steel bottom plate to complete the installation.

[0069] In this embodiment, when the insertion process stops, the stainless steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the phenolic resin foam hole, forming a barbed hook to tightly taper the phenolic resin foam darkroom material, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0070] Example 4

[0071] The difference from Example 3 is that pointed cone cyanate resin foam darkroom material units (regular quadrangular pyramids) with a bottom side length of 200 mm×200 mm, a height of 400 mm and a weight of 2.5 kg are installed in batches.

[0072] In this embodiment, when the insertion process stops, the stainless steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the cyanate resin foam hole, forming a barbed hook to tightly connect the sharp cone cyanate resin foam darkroom material, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0073] Example 5

[0074] The difference from Example 3 is that pointed pyramid polyimide resin foam darkroom material units (regular quadrangular pyramids) with a bottom side length of 200 mm×200 mm, a height of 400 mm, and a weight of 2.1 kg are installed in batches.

[0075] In this embodiment, when the insertion process stops, the stainless steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the polyimide resin foam hole, forming a barbed hook to tighten the sharp cone polyimide resin foam darkroom material, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0076] Example 6

[0077] In this embodiment, in order to install the pointed cone carbon foam darkroom material units (regular tetrahedron) with a bottom side length of 80mm×80mm, a height of 180mm, and a weight of 0.38Kg in batches, first drill flat-bottomed internal thread holes with a hole depth of 8mm (H1) and a large diameter of 10mm (D) on the carbon steel bottom plate at intervals of 80mm, and then use a carbide drill to drill a hole centered at the bottom of each pointed cone carbon foam darkroom material unit with a hole diameter of 10mm (D) and a hole depth of 60mm (H2). The batch of carbon steel wires with a length of 52mm and a diameter of 0.8mm (d1) are shaped into a shape with an arc in the middle and two ends turned outward at an angle of 35° (α) by pressing the mold, and the length of the turned-out end part is 3mm. Aluminum alloy rods are used to process the aluminum alloy round rods that fix the pointed cone carbon foam darkroom material unit. Each aluminum alloy rod is integrated into a screw rod and a thin cylinder. The screw rod part has a large diameter of 10mm (D) and a length of 8mm (H1). The thin cylinder has a diameter of 8mm (d2) and a length of 60mm (H2). The end of the thin cylinder is further processed into a conical end with a height of 3mm. Two orthogonal and interpenetrating loading holes with a diameter of 3mm are drilled 1.5mm from the bottom of the cone. All aluminum alloy round rods are vertically fastened to the carbon steel base plate through turnbuckles. Four carbon steel shaping wires are alternately orthogonally mounted in the two orthogonal loading holes of each aluminum alloy round rod. Each mounted carbon steel shaping wire is placed as symmetrically as possible on both sides of the thin cylinder, and the arc mouth of each carbon steel shaping wire faces the direction of installing the carbon steel base plate. Insert each pointed cone carbon foam darkroom material unit into the thin cylindrical part of the aluminum alloy round rod through the bottom hole, and stop when it is close to the carbon steel bottom plate to complete the installation.

[0078] In this embodiment, when the insertion process stops, the carbon steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the carbon foam hole, forming a barbed hook to tighten the sharp cone carbon foam darkroom material unit, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0079] Example 7

[0080] The difference from Example 6 is that bronze rods are used to process the bronze round rods that fix the pointed cone carbon foam darkroom material unit.

[0081] In this embodiment, when the insertion process stops, the carbon steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the carbon foam hole, forming a barbed hook to tighten the sharp cone carbon foam darkroom material unit, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0082] Example 8

[0083] In this embodiment, in order to install the pointed cone silicon carbide foam darkroom material units (regular tetrahedrons) with a bottom side length of 80mm×80mm, a height of 210mm, and a weight of 0.53Kg in batches, first drill flat-bottomed internal thread holes with a hole depth of 9mm (H1) and a major diameter of 10mm (D) on the carbon steel bottom plate at intervals of 80mm, and then use a carbide drill to drill holes centered at the bottom of each pointed cone silicon carbide foam darkroom material with a hole diameter of 10mm (D) and a hole depth of 62mm (H2). The batch of stainless steel wires with a length of 52mm and a diameter of 1mm (d1) are shaped into a shape with an arc in the middle and two ends turned outward at an angle of 35° (α) by pressing the mold, and the length of the turned-out end portion is 3mm. Carbon steel rods are used to process the carbon steel round rods for fixing the conical silicon carbide foam darkroom material. Each carbon steel rod is integrated into a screw rod and a thin cylinder. The screw rod has a large diameter of 10mm (D) and a length of 9mm (H1). The thin cylinder has a diameter of 7.8mm (d2) and a length of 62mm (H2). The end of the thin cylinder is further processed into a conical end with a height of 3mm. Two orthogonal and interpenetrating loading holes with a diameter of 3mm are drilled 1.5mm from the bottom of the cone. All carbon steel round rods are fastened vertically to the carbon steel base plate through turnbuckles. Four stainless steel shaping wires are alternately orthogonally mounted in the two orthogonal loading holes of each carbon steel round rod. Each mounted stainless steel shaping wire is placed as symmetrically as possible on both sides of the thin cylinder, and the arc mouth of each stainless steel shaping wire faces the direction of installing the carbon steel base plate. Insert each pointed cone silicon carbide foam darkroom material into place through the bottom hole and into the thin cylindrical part of the carbon steel round rod, and stop when it touches the carbon steel bottom plate to complete the installation.

[0084] In this embodiment, when the insertion process stops, the stainless steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the silicon carbide foam hole, forming a barbed hook to tighten the pointed cone silicon carbide foam darkroom material, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0085] Example 9

[0086] In this embodiment, in order to install the pointed cone cyanate resin foam darkroom material units (regular tetrahedrons) with a bottom side length of 120mm×120mm, a height of 300mm, and a weight of 1.29Kg in batches, firstly, flat-bottomed internal thread holes with a hole depth of 12mm (H1) and a major diameter of 14mm (D) are drilled on the carbon steel bottom plate at intervals of 120mm, and then a carbide drill is used to drill a hole centered at the bottom of each pointed cone phenolic resin foam darkroom material with a hole diameter of 14mm (D) and a hole depth of 80mm (H2). The batch of stainless steel wires with a length of 56mm and a diameter of 1mm (d1) are shaped into a shape with an arc in the middle and two ends turned outward at an angle of 35° (α) by pressing the mold, and the length of the turned-out end portion is 3mm. Stainless steel rods are used to process stainless steel round rods for fixing the pointed cone cyanate resin foam darkroom material. Each stainless steel rod is integrated into a screw rod and a thin cylinder. The screw rod has a large diameter of 14mm (D) and a length of 12mm (H1). The thin cylinder has a diameter of 11.5mm (d2) and a length of 80mm (H2). The end of the thin cylinder is further processed into a conical end with a height of 4mm. Two orthogonal and interpenetrating loading holes with a diameter of 3.8mm are drilled 2mm away from the bottom of the cone. All stainless steel round rods are fastened vertically to the carbon steel base plate through turnbuckles. Six stainless steel shaping wires are alternately orthogonally mounted in the two orthogonal loading holes of each stainless steel round rod. Each mounted stainless steel shaping wire is placed as symmetrically as possible on both sides of the thin cylinder, and the arc mouth of each stainless steel shaping wire faces the direction of installing the carbon steel base plate. Insert each pointed cone cyanate resin foam darkroom material into place through the bottom hole and into the thin cylindrical part of the stainless steel round rod, and stop when it touches the carbon steel bottom plate to complete the installation.

[0087] In this embodiment, when the insertion process stops, the stainless steel shaping wire plays a rebound role so that its end can be immediately and effectively embedded in the cyanate resin foam hole, forming a barbed hook to tightly connect the sharp cone cyanate resin foam darkroom material, thereby achieving its rapid and stable installation. Figure 1 to Figure 7 It is a schematic diagram, which serves as a supplementary explanation of the installation process in this embodiment.

[0088] The implementation results show that, in the face of the current technical difficulties in installing pointed cone-shaped rigid foam darkroom materials suitable for extreme use environments, the present invention proposes a wire barb method: first, a hole is drilled in the center of the bottom of the pointed cone-shaped rigid foam darkroom material, and then one end of the metal round rod is fixed to the base plate, and the other end is loaded with a molded steel wire, which is inserted into the hole at the bottom of the rigid foam darkroom material. The steel wire entering the hole plays a rebound role so that its end is embedded in the rigid foam hole, forming a barb hook, which prevents the pointed cone-shaped rigid foam darkroom material from moving and rotating arbitrarily, thereby achieving its rapid and stable installation.

Claims

1. A method for installing a cone-shaped rigid foam darkroom material suitable for extreme use environments, characterized in that: The steel wire barb method is adopted. First, a hole is drilled in the center of the bottom of the pointed cone rigid foam darkroom material unit, and then one end of the metal round rod is fixed to the bottom plate. The other end of the metal round rod is loaded with a molded steel wire, which is inserted into the hole at the bottom of the pointed cone rigid foam darkroom material unit. The steel wire entering the hole plays a rebound role to embed the end of the metal round rod into the rigid foam hole, forming a barb hook, so that the pointed cone rigid foam darkroom material unit cannot move and rotate arbitrarily, thereby realizing its quick and stable installation.

2. A method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 1, characterized in that: First, fix the metal round rod on the bottom plate, and then use the wire hook method to tightly connect the pointed cone hard foam darkroom material unit with the metal round rod. The specific installation process is as follows: (1) Drilling holes on the bottom plate Based on the installation idea that the top of the pointed cone rigid foam darkroom material unit faces the electromagnetic wave, and the bottom is fixed to the bottom plate with the help of wire hooks and metal round rods, it is necessary to comprehensively consider the structural size and weight of the pointed cone rigid foam darkroom material unit, design the number and size of the metal round rods, and then determine the position distribution and size of the installation holes to be drilled on the bottom plate. The bottom plate is a metal plate, and the drilled holes are flat-bottomed internal thread holes. The major diameter D of the internal thread is required to be 4mm to 20mm, and the hole depth H1 is required to be 3mm to 15mm; (2) Drilling of the Cone Hard Foam Darkroom Material Unit Based on the number and size of the metal round rods, a carbide drill is used to drill a hole in the center of the bottom of each conical hard foam darkroom material unit, with a hole diameter of D and a hole depth H2 of 15mm to 100mm; (3) Molding of steel wire The length of the steel wire is 15mm to 70mm, and the diameter d1 of the steel wire is 0.3mm to 2mm. The steel wire is firstly pressed by a mold to be shaped into a middle arc shape with both ends moderately turned outward. The eversion angle α is required to be 30° to 45°, and the length of the eversion end part is 1mm to 6mm. (4) Design and processing of metal round rods First, each metal bar is integrated into a thick and thin cylinder, wherein: the thick cylinder has a diameter of D and a length of H1, and is further processed into a screw rod with an external thread major diameter of D, which is matched with the internal thread on the bottom plate to form a turnbuckle; the thin cylinder has a diameter of d2 and a length of H2, and the end of the thin cylinder is further processed into a conical end, the height of the conical end is 2mm to 5mm, and is matched with the conical part of the bottom drilling hole of the pointed cone hard foam darkroom material unit; two loading holes are drilled in the radial direction of the thin cylinder for loading steel wire, the two loading holes are orthogonal and interpenetrating, the hole diameters are both 2 to 4 times the steel wire diameter d1, the center of the loading hole is 0.5mm to 3mm away from the bottom of the cone, and is as close to the end of the thin cylinder as possible; (5) Loading of shaping wire First, fasten all the metal round bars vertically to the base plate through the screw buckles, and then alternately pass the shaping steel wires through the two orthogonal loading holes of each metal round bar. Each mounted shaping steel wire should be placed symmetrically on both sides of the thin cylinder as much as possible, and the arc-shaped mouth of the shaping steel wire should face the direction of the installation base plate; (6) Installation of the Cone Hard Foam Darkroom Material Unit Each pointed cone rigid foam darkroom material unit is inserted into the bottom hole in conjunction with the thin cylindrical part of the metal round rod, and stopped when it is close to the bottom plate. The steel wire entering the hole plays a rebound role so that its outward-turned and shaped end can be embedded in the foam hole, forming a barb to hook the darkroom material tightly, thereby achieving rapid and stable installation of the pointed cone rigid foam darkroom material unit.

3. A method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 2, characterized in that: The used pointed cone hard foam darkroom material unit is a quadrangular pyramid structure with a square bottom, and adopts silicon carbide-based foam darkroom material, carbon-based foam darkroom material, cyanate resin-based foam darkroom material, polyimide resin-based foam darkroom material or phenolic resin-based foam darkroom material.

4. A method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 2, characterized in that: The metal round rod material used is aluminum alloy, bronze, carbon steel or stainless steel.

5. The method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 2, characterized in that: The steel wire material used is carbon steel or stainless steel.

6. A method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 2, characterized in that: The steel wire is shaped by applying pressure through the mold. The arc-shaped design in the middle enables the steel wire to be symmetrically mounted on both sides of the metal round rod. The outward-turned design at both ends ensures that the ends are fully embedded in the foam holes when the steel wire rebounds, forming barbs that can hook the darkroom material.

7. A method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 2, characterized in that: The thin cylindrical part of the metal round rod is inserted into the bottom hole of the pointed cone hard foam darkroom material unit, and the diameter d2 of the thin cylinder is smaller than the diameter D of the hole.

8. The method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 2, characterized in that: Two steel wire loading holes are designed to be orthogonal and interpenetrating, so that the steel wires are dispersed radially in the metal round rod to increase the force of the barb; the number of steel wires loaded alternately orthogonally is controlled to be 2 to 6, and the number of steel wires in each loading hole is 1 to 3. When the number of steel wires loaded in each loading hole exceeds 2, the steel wires are arranged in sequence in the horizontal direction.

9. The method for installing a pointed cone rigid foam darkroom material suitable for extreme use environments according to claim 2, characterized in that: The radial dimension of the metal round rod thin cylinder plus the steel wire is smaller than the bottom hole diameter of the pointed cone hard foam darkroom material unit: 2×d1+d2<D, d1 is the steel wire diameter, D is the hole diameter, and d2 is the thin cylinder diameter.

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