CN103633433A - Rotationally-molded antenna housing and preparation method thereof - Google Patents
Rotationally-molded antenna housing and preparation method thereof Download PDFInfo
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- CN103633433A CN103633433A CN201310574398.5A CN201310574398A CN103633433A CN 103633433 A CN103633433 A CN 103633433A CN 201310574398 A CN201310574398 A CN 201310574398A CN 103633433 A CN103633433 A CN 103633433A
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Abstract
The invention discloses a rotationally-molded antenna housing, which comprises a cylindrical shell, wherein the cylindrical shell comprises a side wall, a top cover arranged at the top end of the side wall, and a bottom cover arranged at the bottom end of the side wall; the top cover and the bottom cover are of cylindrical, square or other polygonal forms. The invention further discloses a preparation method of the rotationally-molded antenna housing. The method comprises the steps of model design, structural stress simulation analysis, selection of materials, molding by adopting a rotational molding technology and the like, so that the problems of difficulty in molding a large-sized antenna housing, poor quality, high cost and the like existing in the conventional antenna housing molding technology are solved. The rotationally-molded antenna housing prepared according to the preparation method of the rotationally-molded antenna housing disclosed by the invention has the characteristics of low stress, reliable structure, simple materials, easiness in molding, uniform wall thickness, high consistence, light weight, low dielectric constant and the like, and the requirement of a high-performance antenna array can be met.
Description
[technical field]
The present invention relates to a kind of rotational moulding radome and preparation method thereof.
[background technology]
In field of antenna, generally antenna system all can be provided with radome.The object of radome is the impact that protection antenna system is avoided wind and rain, ice and snow, sand and dust and solar radiation etc., makes antenna system service behaviour more stable, reliable.The wearing and tearing, the corrosion and aging that alleviate antenna system increase the service life simultaneously.Antenna, as communication product, has again good electric property when requiring radome to have good mechanical performance, lower dielectric constant for example, the good saturating rate of ripple etc.
Larger for the general volume of exterior aerial, outer cover adopts stake shell body, various informative.Traditional antenna outer cover is more often used injection mo(u)lding, plastics (fiberglass) pultrusion and hand to stick with paste frp process moulding.But due to the constraint of the reasons such as moulding process and material, for large-scale antenna cover, there is more limitation in traditional moulding process, and for example injection mold cost is high; There is product distortion distortion in plastics (fiberglass) pultrusion, cannot complete the problems such as Modeling of Complex Surface in large complicated radome is made; Hand is stuck with paste fiberglass radome and is had that radome consistency is poor, wall unevenness, poor dimensional precision, the low inferior problem of production efficiency.
Along with the fast development of mobile communications industry, operator has proposed more and more higher requirement to the network optimization in its networking at present, and antenna market competition is increasing.To the antenna outward appearance of base station embellished antenna particularly, performance, quality, price, supply of material efficiency, proposes more and more higher requirement.Its radome is as the important component part of antenna, especially for moulding complexity or volume compared with for large radome, the shortcoming that traditional handicraft in the urgent need to address exists, thus improve radome quality.
[summary of the invention]
Primary and foremost purpose of the present invention is to provide a kind of rotational moulding radome and preparation method thereof, solves large-scale antenna cover moulding difficulty, wall unevenness, consistency is poor, cost is high and the low inferior problem of production efficiency.
For realizing this object, the present invention adopts following technical scheme:
A rotational moulding radome, comprises cylindrical shell, and described cylindrical shell comprises sidewall, be located at the top cover on sidewall top and be located at the bottom of sidewall bottom, circular, square or other polygonal shapes of being shaped as of described top cover and bottom.
Described top cover, sidewall and bottom are one-body molded, form a complete totally enclosed space.
Described sidewall is annular sidewall, comprises arcwall, two radial walls that the longitudinal axis direction from two circumferential end of arcwall towards arcwall extends to form respectively and the connecting wall that two radial walls are coupled together.
One of them circumferential end depression of the arcwall of described annular sidewall, thereby form the location notch extending along the longitudinal axis of annular sidewall, another circumferential end is outstanding, thereby form the positioning strip extending along the longitudinal axis of annular sidewall, thereby realize the splicing of a plurality of rotational moulding radomes, facilitated the installation and management of antenna groups.
On described two radial walls, be equipped with many walings, between adjacent two walings, form a groove, described groove can with another rotational moulding radome radial wall on waling be fastened and connected.
Average wall thickness >=the 3mm of described rotational moulding radome, its edge wall thickness can surpass 5mm.
The dielectric constant of described rotational moulding radome is less than 3.
A preparation method for rotational moulding radome, comprises the following steps:
Modelling, according to the requirement of the multinomial mechanical property of radome product, by carry out designing antenna cover model with computer aided design software three-dimensional modeling, and utilizing HFSS software to carry out parameter setting and optimization to radome model according to the requirement of electric index, described radome model is the cylindrical shell with top cover, sidewall and bottom;
Structure stress simulation analysis, by force analysis software, cylindrical shell is carried out to stress simulation analysis, hot strength, shear strength and the limit of deflection of calculating cylindrical shell under multiple environment, determine the position that cylindrical shell stress is concentrated, and solve problem of stress concentration;
Electrical Engineer is according to the electric index request of radome, adjusts shape, thickness, density, dielectric constant, the tangent angle loss of cylindrical shell and/or other are to the influential parameter of the electric index of radome;
The selection of material, by design and simulation and experiment test repeatedly, from improving antenna horizontal beam width convergence, reduce the wastage and improve the angle of front and back ratio, selects resin material to carry out moulding cylindrical shell;
Rotational molding technique moulding, provide there is mould, the rotational moulding machine of heating chamber and cooling chamber, the powder of deployed resin material is added in the inner chamber of mould, and mould is arranged on rotational moulding machine, rotational moulding machine adds heating chamber with mould, and rotate at vertical and horizontal both direction, make mould heating, the resin material of melting sticks and is sintered in the state of plastics the inner surface of dies cavity, continuous rotation along with mould, mould produces heating chamber and enters cooling chamber, the cooling formation cylindrical shell of plastics goods in cooling chamber.
The preparation method of rotational moulding radome also comprises that structure that the mode by thickening the wall thickness of described cylindrical shell corner and/or add reinforcement on cylindrical shell improves radome is to solve the step of problem of stress concentration.
Described force analysis software comprises computer-aided engineering software, i.e. CAE software.CAE software can be done static structure analysis and dynamic analysis; Research linearity and nonlinear problem; Analyze solid structure, fluid, electromagnetism etc.The present invention utilizes CAE software to solve the structural mechanical property of analyzing radome, and the performance etc. of optimizing structure.
Described resin material is one or more in polyethylene, fiberglass, polyvinyl chloride or other resin materials.
Compared with prior art, the present invention possesses following advantage:
Compare with the moulding process of traditional antenna cover, the preparation method of rotational moulding radome has solved traditional handicraft large-scale antenna cover moulding difficulty, ropy problem.It is little that rotational moulding radome has stress, reliable in structure, and the feature such as material is simple, and moulding is easy, and wall thickness is even, and high conformity is lightweight, and dielectric constant is low, can meet high performance antenna array request.
[accompanying drawing explanation]
Fig. 1 a is the three-dimensional structure diagram of rotational moulding radome in embodiment of the present invention;
Fig. 1 b is the end view of rotational moulding radome;
Fig. 2 is the vertical view of the rotational moulding radome shown in Fig. 1 a;
Fig. 3 a is the upward view of the rotational moulding radome shown in Fig. 1 a;
Fig. 3 b is the three-dimensional structure diagram of the inserts of rotational moulding radome of the present invention;
Fig. 4 is that a plurality of rotational moulding radome provided by the invention splices mutually the closed closed radome finished product forming.
[embodiment]
Below in conjunction with accompanying drawing and exemplary embodiment, the present invention is further described, wherein in accompanying drawing, identical label all refers to identical parts.In addition, if the detailed description of known technology is unnecessary for feature of the present invention is shown, by its omission.
As shown in Fig. 1 a to Fig. 4, the invention discloses a kind of rotational moulding radome, it comprises cylindrical shell 1, and described cylindrical shell 1 comprises annular sidewall 11, be arranged on the upper end of described annular sidewall 11 and integrated top cover 12 and be arranged on the bottom 13 of described annular sidewall 11 bottoms with it.
Preferably, the cross sectional shape of described top cover 12 and bottom 13 can be circular, square or other polygon.By being connected to each other between top cover 12, annular sidewall 11 and bottom 13 threes, can being combined into the radome of various moulding, thereby can meeting the demand of the antenna of various different shapings.
Described annular sidewall 11 comprises arcwall 1112, two radial walls 1114 that the longitudinal axis direction from two circumferential end of arcwall 1112 towards arcwall 1112 extends to form respectively and the connecting wall 1116 that two radial walls 1114 are coupled together.
For the moulded of Beautified radome and strengthen the structural strength of whole radome, on the outer surface of the arcwall 1112 of described annular sidewall 11, be horizontally arranged with reinforcement 111.
In the present embodiment, one of them circumferential end depression of the arcwall 1112 of described annular sidewall 11, thereby form the location notch 112 extending along the longitudinal axis of annular sidewall 11, another circumferential end is outstanding, thereby forms the positioning strip 119 extending along the longitudinal axis of annular sidewall 11.
When a plurality of rotational moulding radomes are spliced to form mutually radome finished product, the location notch 112 of one of them rotational moulding radome and the mutual buckle of positioning strip 119 of another rotational moulding radome, then 112 of the location notchs of a rotational moulding radome and the mutual buckle of positioning strip 119 of previous radome.Thereby realize the mutual positioning action between a plurality of radomes.And, a plurality ofly such as splicing mutually, 3 rotational moulding radomes can form column type radome finished product, and convenient antenna group installing concentratedly and managing.
Preferably, on two described radial walls 1114 and described connecting wall 1116, be provided with waling 113, this waling is in order to avoid the easy distortion of large flat plastic moulding, problem on deformation.In addition, upper adjacent two walings 113 of radial wall 1114 can also form the groove that the waling with another rotational moulding radome cooperatively interacts and is fastened and connected.
As shown in Figure 2, top cover 12 is provided with top convex 122, and convex 122 places in top are provided with a threaded post 123, to coordinate the installation of radome.Threaded post 123 peripheries are provided with reinforcement 121, and the intensity of described reinforcement 121, strengthened thread post 123 is avoided the problem of the large plane of plastic products place torsional deformation simultaneously.Described threaded post 123 also can be arranged on described sidewall 11 in other embodiments.
As shown in Figure 3 a, in order to facilitate being connected of cylindrical shell 1 and bottom 13, in the bottom of described annular sidewall 11, be provided with outstanding flange 135 down, on flange 135, laterally compartment of terrain forms a plurality of tongue pieces 1352, described each tongue piece 1352 is provided with inserts, and described inserts is connected for sidewall 11 and bottom 13.
In present embodiment, described inserts is nut 132, and described nut 132 is outer-hexagonal cylinder, can be also other polygon cylinder, and described cylinder is stepped-style cylinder, as shown in Figure 3 b.In other embodiments, inserts can be also bolt or other insertss.In other embodiments, inserts can be also bolt or other insertss.
In the present embodiment, described cylindrical shell 1 is made by polyethylene, and radome proportion is about 2/3 of fiberglass outer cover, has effectively reduced the overall weight of antenna and radome, can effectively lower antenna transportation, carrying, installation cost; The dielectric constant of the radome of present embodiment can be realized and be less than 3, and the PVC(adopting with respect to traditional handicraft approximately 3.4), the radome made of fiberglass (approximately 3.7), can effectively reduce the influence degree of radome to antenna, improve antenna indices.When described bottom 13 is not one-body molded with sidewall 11, described bottom 13 can also be made by metal or other materials.
On electric, general, in order to make reflection minimum, the radome design wall thickness of should trying one's best is even.The rotational moulding radome of present embodiment, the wall thickness of cylindrical shell 1 is comparatively even, and its wall thickness >=3mm has solved the problem that hand is stuck with paste fiberglass radome wall unevenness.Same, the edge wall thickness of rotational moulding radome can be realized over 5mm, and its edge strength is good, is not easy to produce the problem of distortion, has solved the little problem of bringing of traditional antenna shroud rim wall thickness.In addition, due to rotational moulding radome of the present invention can first top cover, the cylindrical shell 1 of sidewall and the one-body molded complete enclosure space of bottom, then carry out secondary operations and form final rotational moulding radome finished product, thereby can realize the better effect of waterproof and dustproof performance.
The present invention provides a kind of preparation method of above-mentioned rotational moulding radome simultaneously, comprises the steps such as the selection of modelling, structure stress simulation analysis, electrical simulation analysis, material and rotational molding technique moulding.Respectively these steps are described in detail below.
Modelling, according to the multinomial mechanical property index request of radome product, by carry out three-dimensional modeling designing antenna cover model with computer aided design software, and according to electric index request, utilize HFSS software to carry out parameter setting and optimization to radome model, described radome model is to have annular sidewall 11, be located at the top cover 12 on described annular sidewall 11 and be located at the cylindrical shell 1 of the bottom 13 under sidewall 11;
Structure stress simulation analysis, by force analysis software, described cylindrical shell is carried out to stress simulation analysis, hot strength, shear strength and the limit of deflection of calculating cylindrical shell under multiple environment, determine the position that each component stress is concentrated, and solve problem of stress concentration;
Electrical simulation is analyzed, and Electrical Engineer adjusts the shape, thickness, density, dielectric constant, tangent angle loss of cylindrical shell 1 and/or other have the parameter of material impact to the electric index of radome;
The selection of material, by design of Simulation and experiment test repeatedly, from improving antenna horizontal beam width convergence, reduce the wastage and improve the angle of front and back ratio, selects polyethylene powders, with contoured beam antenna cover;
Rotational molding technique moulding, provide and there is mould, the rotational moulding machine of heating chamber and cooling chamber, deployed toner is added in the inner chamber of mould, and mould is arranged on rotational moulding machine, rotational moulding machine adds heating chamber with mould, and rotate at vertical and horizontal both direction, make mould heating, the toner of melting sticks and is sintered in the inner surface of dies cavity, continuous rotation along with mould, mould produces heating chamber and enters cooling chamber, cooling formation cylindrical shell 1 goods in cooling chamber, reach after mold clearing temperature, mould stops the rotation, open mould, take out cylindrical shell 1 goods.
In present embodiment, described multiple condition comprises the different geographical environments such as mountain region, plateau, desert, ocean, glacier, also comprises the harsh weather situations of change such as snowslide, typhoon, heavy rain, sandstorm, earthquake.The present invention considers under multiple condition, the waterproof of radome, anti-aging, is subject to force intensity and the highest blast requirement in 50 years, from the angle of the aspects such as optimal electric parameter, radiance, the structure of appropriate design radome.
Rotational moulding radome of the present invention mainly comprises the large-scale antenna cover being installed under outdoor, multiple condition, and it has good waterproof and dustproof, wind resistance texts, thereby adopts rotational molding technique moulding; Rotational moulding radome of the present invention also needs to meet the requirement of multiple electric index, thereby before moulding, needs radome model to carry out structure stress simulation analysis and electrical simulation analysis.
In present embodiment, mechanical property index comprises joint geometry, radome matter material, shape, size, weight, wind lotus, conforms etc.; Described multiple electric index comprises transmission characteristic index and radiation characteristic index, and described transmission characteristic index comprises standing-wave ratio, frequency bandwidth, isolation, third order intermodulation, power capacity etc.; Described radiation characteristic index comprises bandwidth of operation, gain, polarization, lobe width, front to back ratio, upper Sidelobe Suppression, null filling angle of declination etc.
In present embodiment, described computer aided design software comprises CAD, Pro/E, UG(Unigraphics) etc. Three-dimensional Design Software.Described force analysis software comprises computer-aided engineering software, i.e. CAE software.CAE software can be done static structure analysis and dynamic analysis; Research linearity and nonlinear problem; The structure of analysis solid, fluid, electromagnetism etc.The present invention utilizes CAE software to solve the structural mechanical property of analyzing radome, and the performance etc. of optimizing structure.
For fear of the large-scale plane of radome or large-scale curved torsional deformation, the present invention improves the structure of radome to solve problem of stress concentration by the mode of thickening the wall thickness of described cylindrical shell corner and/or adding reinforcement on cylindrical shell.
Because rotational moulding radome of the present invention is by rotational molding technique moulding, its Design of Dies is more convenient, even, without adjusting mould, can automatically thicken as required the wall thickness of radome, be specially in the process of radome moulding, in mould, add appropriate polyethylene powders.
In the preparation method of rotational moulding radome of the present invention, the material of described cylindrical shell 1 is polyvinyl resin material.In other embodiments, the material of described cylindrical shell 1 can also be one or more in polyvinyl chloride, fiberglass and/or other resin materials.
The preparation method of described rotational moulding radome also comprises the step of rotational moulding radome being carried out to secondary operations; For the cylindrical shell of top cover 12, sidewall 11 and bottom 13 three in one moulding, according to the shape of radome, size and/or other requirements, described cylindrical shell 1 is carried out to cutting, and corresponding inserts is set to coordinate and being connected of three.
The preparation method of the inserts of present embodiment is that described a plurality of nut 132 is fixed on mould at a certain distance, between every two nuts 132, forms some raceway grooves 1321.Radome is in forming process, and resin raw material is inlayed position 131 from described nut and entered the resin raw material of nut 132 parcel and melting is entered to described raceway groove 1321, the stable overall structure of the cooling rear formation of radome moulding.
Although shown exemplary embodiments more of the present invention above, but it should be appreciated by those skilled in the art that, in the situation that not departing from principle of the present invention or spirit, can make a change these exemplary embodiments, scope of the present invention is limited by claim and equivalent thereof.
Claims (9)
1. a rotational moulding radome, comprises cylindrical shell, it is characterized in that, described cylindrical shell comprises sidewall, be located at the top cover on sidewall top and be located at the bottom of sidewall bottom, circular, square or other polygonal shapes of being shaped as of described top cover and bottom.
2. rotational moulding radome according to claim 1, is characterized in that, described top cover, sidewall and bottom are one-body molded, forms a complete totally enclosed space.
3. rotational moulding radome according to claim 1, it is characterized in that, described sidewall is annular sidewall, comprises arcwall, two radial walls that the longitudinal axis direction from two circumferential end of arcwall towards arcwall extends to form respectively and the connecting wall that two radial walls are coupled together.
4. rotational moulding radome according to claim 3, it is characterized in that, one of them circumferential end depression of the arcwall of described annular sidewall, thereby form the location notch extending along the longitudinal axis of annular sidewall, another circumferential end is outstanding, thereby forms the positioning strip extending along the longitudinal axis of annular sidewall.
5. according to the rotational moulding radome described in claim 3 or 4, it is characterized in that, on described two radial walls, be equipped with many walings, between adjacent two walings, form a groove, described groove can with another rotational moulding radome radial wall on waling be fastened and connected.
6. according to the rotational moulding radome described in claim 3 or 4, it is characterized in that, the dielectric constant of described rotational moulding radome is less than 3.
7. a preparation method for rotational moulding radome, is characterized in that, comprises the following steps:
Design a model, according to the requirement of the multinomial mechanical property of radome product, by carry out three-dimensional modeling designing antenna cover model with computer aided design software, and according to the requirement of electric index, utilize HFSS software to carry out parameter setting and optimization to radome model, described radome model be comprise sidewall, be arranged on described sidewall upper end top cover and be arranged on the cylindrical shell of the bottom of described sidewall bottom;
Structure stress simulation analysis, carries out stress simulation analysis by force analysis software to described cylindrical shell, calculates hot strength, shear strength and/or the limit of deflection of described cylindrical shell under multiple environment, determines the position that cylindrical shell stress is concentrated;
Electrical simulation is analyzed, and according to the electric index request of radome, adjusts shape, thickness, density, dielectric constant, tangent angle loss and/or other influential parameters of electric index to radome of cylindrical shell;
The selection of material, from improving antenna horizontal beam width convergence, reduce the wastage and/or improve the angle of front and back ratio, by design and simulation and experiment test repeatedly, selects resin material, with moulding cylindrical shell;
Rotational molding technique moulding, provide there is mould, the rotational moulding machine of heating chamber and cooling chamber, the powder of deployed resin material is added in the inner chamber of mould, and mould is arranged on rotational moulding machine, rotational moulding machine adds heating chamber with mould, and rotate at vertical and horizontal both direction, make mould heating, the toner of melting sticks and is sintered in the inner surface of dies cavity, along with the continuous rotation of mould, mould produces heating chamber and enters cooling chamber, and cylindrical shell is cooling forming in cooling chamber.
8. the preparation method of rotational moulding radome according to claim 7, it is characterized in that, the preparation method of described rotational moulding radome also comprises that structure that the mode by thickening the wall thickness of described cylindrical shell corner and/or add reinforcement on cylindrical shell improves radome is to solve the step of problem of stress concentration.
9. the preparation method of rotational moulding radome according to claim 7, is characterized in that, described resin material is one or more in polyethylene, fiberglass, polyvinyl chloride or other resin materials.
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| CN201310574398.5A CN103633433A (en) | 2013-11-15 | 2013-11-15 | Rotationally-molded antenna housing and preparation method thereof |
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| CN201310574398.5A CN103633433A (en) | 2013-11-15 | 2013-11-15 | Rotationally-molded antenna housing and preparation method thereof |
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| CN105406156A (en) * | 2015-11-27 | 2016-03-16 | 哈尔滨工业大学 | Cylindrical frequency selective surface structure |
| CN106129618A (en) * | 2016-08-09 | 2016-11-16 | 湖北三江航天江北机械工程有限公司 | Seal wave transparent antenna house sleeve part and forming method |
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| WO2023246332A1 (en) * | 2022-06-20 | 2023-12-28 | 广州司南技术有限公司 | New-type lens antenna outer cover, and antenna device |
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Application publication date: 20140312 |