Beidou navigation antenna housing structure

Abstract

The utility model discloses a Beidou navigation antenna housing structure, which is characterized in that an opening end face of a housing body is cut by laser to form a notch, a metal ring is matched with the opening end face of the housing body, and an outer ring of the metal ring retracts into the bottom edge of the metal ring and is positioned in the notch of the opening end face of the housing body. The outer diameter of the bottom edge of the metal ring is consistent with the outer diameter of the opening end face of the cover body, and the cover body and the metal ring are bonded through a temperature-resistant adhesive. According to the method, a metal ring is fixed to a steel circular ring tool, a notch in the opening end face of a cover body and a turnup structure of the outer ring of the metal ring are coated with a temperature-resistant adhesive, and the cover body is bonded to the metal ring; superfluous glue is extruded through pressurization of a pressurization tool, and the superfluous glue is heated, cured and shaped and cleaned; and spraying weather-proof PU paint on the surface of the radome body to complete the assembly of the radome. According to the structure and the method, the flatness, the appearance consistency and the air tightness of the mounting surface of the antenna housing are improved, the thickness uniformity of the housing body is ensured, the wave-transparent loss of the housing body is reduced, the manufacturing efficiency is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of antenna cover manufacturing, and in particular to a Beidou navigation antenna cover structure. Background Art

[0002] As an important part of the antenna system, the Beidou navigation radome not only provides a transparent electromagnetic window, but also protects the internal RF components from the harsh environment, making the Beidou equipment work stably and reliably. The radome protects the RF components and also becomes a natural barrier in front of the RF antenna, changing the free space energy distribution of the RF antenna, which affects the reception and transmission of satellite signals by the equipment to a certain extent. The reception performance of Beidou equipment for radio signals is also one of the important evaluation indicators of Beidou equipment. Therefore, when formulating the production process of the Beidou equipment navigation radome, the overall thickness of the radome is controlled as much as possible to ensure that it has excellent electromagnetic performance. In the traditional production process, the Beidou navigation radome sacrifices the wave transmission performance of the Beidou navigation radome in exchange for the flatness of the radome installation surface through hand-paste reinforcement, and improves the appearance consistency of the radome and the air tightness of the whole radome through painting. However, whether it is hand-paste reinforcement or painting, it is difficult to ensure the uniformity of the thickness of the radome, thereby increasing the wave transmission loss and affecting the overall electromagnetic performance of the radome. In addition, hand-paste reinforcement and painting operations increase labor intensity and reduce the efficiency of radome production. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a Beidou navigation antenna cover structure. The structure overcomes the defects of traditional antenna cover production, effectively improves the flatness of the mounting surface, appearance consistency and air tightness of the antenna cover, ensures the uniformity of the cover body thickness, reduces the wave transmission loss of the cover body, improves the antenna cover production efficiency, and reduces labor intensity.

[0004] In order to solve the above technical problems, the Beidou navigation antenna cover structure of the utility model includes a molded cover body and a metal ring, the inner circle of the open end face of the cover body is formed with a notch by laser cutting, the metal ring is matched with the open end face of the cover body, and the outer circle of the metal ring is retracted into the bottom edge of the metal ring, the outer circle of the metal ring is located in the notch of the inner circle of the open end face of the cover body, the outer diameter of the bottom edge of the metal ring is consistent with the outer diameter of the open end face of the cover body, and the cover body and the metal ring are bonded by a temperature-resistant adhesive.

[0005] Furthermore, the flatness of the cutting surface of the inner circle notch of the opening end surface of the cover body is ≤0.2mm.

[0006] Furthermore, the thickness of the bottom edge of the metal ring is 0.4-0.8 mm, and the flatness is ≤0.1 mm.

[0007] Furthermore, the surface of the cover body is sprayed with weather-resistant PU paint.

[0008] A Beidou navigation radome assembly method based on the above radome structure comprises the following steps:

[0009] Step 1: Form a notch on the inner circle of the opening end surface of the cover body by laser cutting, and the flatness of the cutting surface of the notch is ≤0.2mm;

[0010] Step 2: The outer ring of the metal ring is designed to be a flanged structure, that is, the outer ring of the metal ring is retracted into the bottom edge of the metal ring, and the bottom edge of the metal ring forms a flange;

[0011] Step 3: Fix the metal ring to the steel ring fixture by bolts, apply heat-resistant adhesive to the notch of the inner ring of the cover opening end face and the flange structure of the outer ring of the metal ring, and bond the cover opening end face to the flange structure of the outer ring of the metal ring;

[0012] Step 4: Move the steel ring fixture together with the metal ring and the cover body to the pressurizing fixture, pressurize the pressurizing fixture to squeeze out the excess glue between the metal ring and the cover body, heat and cure to fix the shape, and clean up the residual glue between the metal ring and the cover body;

[0013] Step 5: Remove the pressurized tooling and the steel ring tooling, spray weather-resistant PU paint directly on the surface of the cover, and complete the assembly of the antenna cover.

[0014] Furthermore, after the pressurizing tooling squeezes out the excess glue between the metal ring and the cover body, it is ensured that the gap between the metal ring and the cover body at the glue joint is ≤0.3 mm.

[0015] Furthermore, the flatness of the contact surface between the steel ring fixture and the metal ring is ≤0.05mm.

[0016] Furthermore, the temperature for heating and curing the metal ring and the cover body is 60° C. and the time is 2 hours.

[0017] Furthermore, the heat-resistant adhesive maintains a 5% elongation at break and a shear strength of not less than 15 MPa at a low temperature of -55°C to a high temperature of 70°C.

[0018] Furthermore, the pressurizing tooling includes a chassis, three support columns evenly distributed on the surface of the chassis, and a T-shaped pressure plate hinged to the top of the three support columns. A pressure plate is provided in the center of the T-shaped pressure plate through a screw, and pressure is applied to the surface of the cover body by rotating the pressure plate.

[0019] Since the Beidou navigation antenna cover structure and assembly method of the utility model adopt the above-mentioned technical scheme, that is, the inner circle of the open end face of the cover body of the structure forms a notch by laser cutting, the metal ring matches the open end face of the cover body, and the outer circle of the metal ring is indented into the bottom edge of the metal ring, the outer circle of the metal ring is located in the notch of the inner circle of the open end face of the cover body, the outer diameter of the bottom edge of the metal ring is consistent with the outer diameter of the open end face of the cover body, and the cover body and the metal ring are bonded by a heat-resistant adhesive. The method fixes the metal ring on the steel circular ring tooling, applies a heat-resistant adhesive to the notch of the inner circle of the open end face of the cover body and the flange structure of the outer circle of the metal ring, and bonds the open end face of the cover body to the flange structure of the outer circle of the metal ring; pressurizes and squeezes out the excess glue between the metal ring and the cover body by the pressurizing tooling, and heats and solidifies to shape, and cleans the residual glue between the metal ring and the cover body; sprays weather-resistant PU paint on the surface of the cover body to complete the assembly of the antenna cover. This structure and assembly method overcome the defects of traditional radome production, effectively improve the flatness of the mounting surface, appearance consistency and air tightness of the radome, ensure the uniformity of the thickness of the radome, reduce the wave transmission loss of the radome, improve the efficiency of radome production, and reduce labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0021] Figure 1 This is a schematic diagram of the Beidou navigation antenna cover structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the cover body in this structure;

[0023] Figure 3 is a schematic diagram of the metal ring in this structure;

[0024] Figure 4 for Figure 1 A magnified schematic diagram of part A in FIG.

[0025] Figure 5 for Figure 3 A magnified schematic diagram of part B in FIG.

[0026] Figure 6 It is a schematic diagram of the tooling for fixing the metal ring to the steel ring in this method;

[0027] Figure 7 This is a schematic diagram of pressurizing the pressurizing tool in this method. DETAILED DESCRIPTION

[0028] Implementation example Figures 1 to 5As shown, the Beidou navigation antenna cover structure of the utility model includes a molded cover body 1 and a metal ring 2, the inner circle of the open end face of the cover body 1 is formed with a notch 11 by laser cutting, the metal ring 2 is matched with the open end face of the cover body 1, and the outer circle 21 of the metal ring is retracted into the bottom edge 22 of the metal ring, the outer circle 21 of the metal ring is located in the notch 11 of the inner circle of the open end face of the cover body 1, the outer diameter of the bottom edge 22 of the metal ring is consistent with the outer diameter of the open end face of the cover body 1, and the cover body 1 and the metal ring 2 are bonded by a temperature-resistant adhesive.

[0029] Preferably, the flatness of the cutting surface of the inner circle notch 11 of the opening end surface of the cover body 1 is ≤0.2 mm.

[0030] Preferably, the thickness of the bottom edge 22 of the metal ring is 0.4-0.8 mm, and the flatness is ≤0.1 mm.

[0031] Preferably, the surface of the cover body 1 is sprayed with weather-resistant PU paint.

[0032] A Beidou navigation radome assembly method based on the above radome structure comprises the following steps:

[0033] Step 1: Form a notch 11 on the inner circle of the opening end surface of the cover body 1 by laser cutting, and the flatness of the cutting surface of the notch 11 is ≤0.2mm;

[0034] Step 2: The outer ring of the metal ring 2 is designed to be a flanged structure, that is, the outer ring 21 of the metal ring is retracted into the bottom edge 22 of the metal ring, and the bottom edge of the metal ring forms a flange;

[0035] Step 3: Figure 6 As shown, the metal ring 2 is fixed to the steel circular ring fixture 3 by bolts, and a heat-resistant adhesive is applied to the notch 11 of the inner ring of the opening end face of the cover body 1 and the flange structure of the outer ring of the metal ring 2, and the opening end face of the cover body 1 is bonded to the flange structure of the outer ring of the metal ring 2;

[0036] Step 4: Figure 7 As shown, the steel ring fixture 3 together with the metal ring 2 and the cover body 1 are moved to the pressurizing fixture 4, and the pressurizing fixture 4 presses and squeezes out the excess glue between the metal ring 2 and the cover body 1, and heats and solidifies the shape, and cleans the residual glue between the metal ring 2 and the cover body 1;

[0037] Step 5: Remove the pressurizing fixture 4 and the steel ring fixture 3, and spray weather-resistant PU paint directly on the surface of the cover body 1 to complete the assembly of the antenna cover.

[0038] Preferably, after the pressurizing tool 4 squeezes out the excess glue between the metal ring 2 and the cover body 1, it is ensured that the gap between the metal ring 2 and the cover body 1 is ≤0.3 mm.

[0039] Preferably, the flatness of the contact surface between the steel ring fixture 3 and the metal ring 2 is ≤0.05 mm.

[0040] Preferably, the temperature for heating and curing the metal ring 2 and the cover body 1 is 60° C. and the time is 2 hours.

[0041] Preferably, the heat-resistant adhesive maintains a 5% elongation at break and a shear strength of not less than 15 MPa at a low temperature of -55°C to a high temperature of 70°C.

[0042] Preferably, Figure 7 As shown, the pressurizing tooling 4 includes a chassis 41, three support columns 42 evenly distributed on the surface of the chassis 41, and a T-shaped pressure plate 43 hinged to the top of the three support columns 42. The T-shaped pressure plate 43 is centrally provided with a pressure plate 45 through a screw 44, and pressure is applied to the surface of the cover body 1 by rotating the pressure plate 45.

[0043] This structure is made by bonding a compression-molded cover body with a notch formed by laser cutting and a specially designed metal ring together under pressure with a high and low temperature resistant adhesive, heating, curing, grinding and removing the residual glue, and then spraying weather-resistant PU paint directly on the surface. The Beidou navigation antenna cover made by this method has the characteristics of uniform cover thickness, good flatness of the cover installation surface, consistent appearance and good air tightness. It overcomes the defects of the traditional method of sacrificing the wave transmission performance of the Beidou navigation cover in exchange for achieving the flatness of the cover installation surface, consistency of paint appearance and air tightness of the whole cover through hand-paste reinforcement.

[0044] The bonding gap between the antenna cover body and the metal ring assembled by this method is uniform. After environmental storage tests (high temperature 70℃ / 24h and low temperature -55℃ / 24h), the adhesive layer has no cracking, extrusion or deformation, and the surface flatness of the metal ring is ≤0.1mm. The Beidou navigation antenna cover produced by this method does not require additional hand-paste reinforcement at the bonding point between the cover body and the metal ring, and weather-resistant PU paint can be directly sprayed on the surface of the cover body to complete the painting of the cover body, thereby improving the efficiency of the antenna cover and reducing labor intensity.

Claims

1. A Beidou navigation radome structure, characterized in that: It includes a molded cover body and a metal ring, wherein a notch is formed in the inner circle of the open end face of the cover body by laser cutting, the metal ring matches the open end face of the cover body, and the outer circle of the metal ring is retracted into the bottom edge of the metal ring, the outer circle of the metal ring is located in the notch of the inner circle of the open end face of the cover body, the outer diameter of the bottom edge of the metal ring is consistent with the outer diameter of the open end face of the cover body, and the cover body and the metal ring are bonded by a temperature-resistant adhesive.

2. The Beidou navigation radome structure according to claim 1, characterized in that: The flatness of the cutting surface of the inner circle notch of the opening end surface of the cover body is ≤0.2mm.

3. The Beidou navigation radome structure according to claim 1, characterized in that: The thickness of the bottom edge of the metal ring is 0.4-0.8 mm, and the flatness is ≤0.1 mm.

4. The Beidou navigation radome structure according to claim 1, characterized in that: The surface of the cover body is sprayed with weather-resistant PU paint.

Images