A dual Beidou anti-interference device during the daily production process of a floating platform

Abstract

The present invention discloses a dual-Beidou anti-interference device during the daily production process of a floating platform. The dual-Beidou anti-interference device includes electromagnetic shielding blades, rotating steel bars, and a base; the rotating steel bars are fixed on the base; three identical electromagnetic shielding blades are arranged on the rotating steel bars; the base can rotate to drive the electromagnetic shielding blades to rotate; the electromagnetic shielding blades include light steel plates and paint film layers coated on both surfaces of the light steel plates; the thickness of the paint film layer is not less than 25 μm, preferably 25-28 μm. The dual-Beidou anti-interference device provided by the present invention also has a certain shielding effect on other electromagnetic radiation interferences in the operating environment of offshore oil platforms, and has excellent electromagnetic interference performance; by adjusting the length of the rotating steel bars and the size of the base, the requirements of different operating platforms can be met.

Description

Technical Field

[0001] The present invention relates to a dual Beidou anti-interference device during the daily production process of a floating platform, belonging to the technical field of key supporting equipment for ocean engineering. Background Art

[0002] The Beidou Satellite Navigation System (BDS) integrates two major functions of positioning and communication, and has gradually been applied to the field of marine positioning. In order to fully ensure the safety of platform production operations, two sets of Beidou positioning devices are usually installed on floating platforms. Limited by the limited space suitable for installing Beidou terminal antennas on offshore platforms, the two sets of devices are usually installed in very close positions. When the Beidou positioning terminal works, it will generate electromagnetic waves, and electromagnetic interference is likely to occur between the two sets of Beidou devices. Electromagnetic shielding is the most effective way among many means to solve electromagnetic interference problems. It suppresses electromagnetic radiation by using the emission and absorption effects of metal conductors, electromagnetic shielding coatings, etc. on electromagnetic radiation. Common electromagnetic shielding devices usually use a shielding body to surround the interference source to prevent the interference electromagnetic field from spreading outwards, or use a shielding body to surround the device to be interfered to prevent the device from being affected by the external electromagnetic field. The normal operation of Beidou devices requires an unobstructed environment to ensure the satellite acquisition effect of Beidou devices. Therefore, it is impossible to surround them with a shielding body. When two sets of Beidou devices work together, how to avoid mutual interference is a problem that has to be solved in actual work. Therefore, it is very necessary to design a dual Beidou anti-interference device during the daily production process of a floating platform. Summary of the Invention

[0003] The purpose of the present invention is to provide a dual Beidou anti-interference device during the daily production process of a floating platform, which can effectively avoid the electromagnetic interference between the two Beidous during the daily production process of the floating platform and does not affect the satellite acquisition effect of the Beidou devices.

[0004] The dual Beidou anti-interference device provided by the present invention includes electromagnetic shielding blades, rotating steel bars, and a base;

[0005] The rotating steel bar is fixed on the base;

[0006] Three completely identical electromagnetic shielding blades are arranged on the rotating steel bar;

[0007] The base can rotate to drive the electromagnetic shielding blades to rotate, avoiding the satellite acquisition effect of the Beidou terminal in a specific direction being affected due to the blades being fixed in a certain position and causing occlusion;

[0008] In the above dual Beidou anti-interference device, the electromagnetic shielding blade includes a light steel plate and a paint film layer coated on the surface of the light steel plate;

[0009] The element composition of the light steel plate is as follows:

[0010] C: 0.003 - 0.004%, Al ≤ 0.003%, O ≤ 0.003%, Si: 1.0 - 2.0%, N ≤ 0.003%, Ti ≤ 0.003%, the balance being Mn, Cr, P metals and impurities.

[0011] The thickness of the paint film layer is not less than 25 μm, preferably 25 - 28 μm;

[0012] The material composition of the paint film layer is as follows:

[0013] It is made by using epoxy resin as the matrix resin and adding conductive filler, coupling agent, additives, curing agent and solvent;

[0014] The epoxy resin is specifically polyurethane-modified epoxy resin;

[0015] The conductive filler can specifically be silver-plated copper powder or graphene;

[0016] The coupling agent can be a silane coupling agent, specifically 3-aminopropyltriethoxysilane or 3-(2,3-epoxypropoxy)propyltrimethoxysilane, etc.;

[0017] The additives include chitosan, benzoxazole antioxidant and SiO₂ anti-settling agent, and the SiO₂ anti-settling agent can specifically be fumed silica;

[0018] The curing agent can specifically be boron trifluoride;

[0019] By mass percentage, among them, the addition amount of the epoxy resin is 25% - 31%, the addition amount of the conductive filler is 35% - 60%, the addition amount of the coupling agent is 3%, the addition amount of the chitosan is 2% - 5%, the addition amount of the benzoxazole antioxidant is 2% - 5%, the addition amount of the SiO₂ is 3% - 6%, and the addition amount of the curing agent is 10% - 25%;

[0020] The solvent is acetone and / or ethyl acetate, and the addition amount is 10% - 25%, which specifically needs to be determined according to the amounts of the matrix resin, conductive filler, coupling agent, additives and curing agent.

[0021] The paint film layer can be prepared according to the following steps: Mix the coupling agent and the additives according to the amounts in the above formula, add part of the solvent, stir evenly, then add the conductive filler and the epoxy resin in sequence, disperse evenly and grind into powder, and then add the remaining solvent and the curing agent according to the formula ratio, activate for 3 - 6 h and seal for standby.

[0022] In the above double-Beidou anti-interference device, with the rotating steel bar as the center, the electromagnetic shielding blades are arranged at equal intervals, and the three electromagnetic shielding blades are distributed at an angle of 120 degrees.

[0023] In the above double Beidou anti-jamming device, the length of the rotating steel bar is not less than 1 m, preferably 1.2 - 1.5 m;

[0024] The weight of the rotating steel bar is 4 - 5 kg.

[0025] In the above double Beidou anti-jamming device, the base includes a rotating plate, a U-shaped box and a power-on rotating device;

[0026] The rotating shaft is arranged on the support shaft. An annular support, a large gear and an annular positioning support are successively arranged on the outer peripheral wall of the rotating shaft from top to bottom. The annular support and the top of the rotating shaft are matched with the rotating plate through a limiting block;

[0027] The support shaft is arranged at the bottom of the U-shaped box;

[0028] An annular counterweight is arranged at the bottom of the U-shaped box. The motor is arranged on the annular counterweight. The output shaft of the motor is connected with the small gear. The small gear is meshed and matched with the large gear. After the motor is started, it drives the small gear to rotate. The small gear drives the large gear to rotate, and then drives the rotating shaft to rotate. The rotating shaft drives the rotating plate to rotate.

[0029] The double Beidou anti-jamming device provided by the present invention also has a certain shielding effect on other electromagnetic radiation interferences in the operation environment of an offshore oil platform, and has excellent electromagnetic interference performance; by adjusting the length of the rotating steel bar and the size of the base, the requirements of different operation platforms can be met. Description of the Drawings

[0030] Figure 1 It is a structural schematic diagram of the double Beidou anti-jamming device during the daily production process of the floating platform of the present invention.

[0031] Figure 2 It is a cross-sectional view of the electromagnetic shielding blade in the double Beidou anti-jamming device during the daily production process of the floating platform of the present invention.

[0032] Figure 3 It is a structural schematic diagram of the base in the double Beidou anti-jamming device during the daily production process of the floating platform of the present invention.

[0033] Figure 4 It is a top view of the base 3 of the double Beidou anti-jamming device during the daily production process of the floating platform of the present invention after removing the rotating plate 31.

[0034] Figure 5 It is a test result diagram of the shielding effectiveness of the shielding coating of the double Beidou anti-jamming device during the daily production process of the floating platform of the present invention.

[0035] The marks in the figure are as follows:

[0036] 1 Electromagnetic shielding blade; 2 Rotating steel bar; 3 Base; 11 Lightweight steel plate; 12 Paint film layer; 13 Paint film layer; 31 Rotating plate; 32 U-shaped box; 33 Limit block; 34 Ring support; 35 Large gear; 36 Ring positioning support; 37 Support shaft; 38 Ring counterweight; 39 Rotating shaft; 3_10 Motor; 3_11 Small gear. Detailed implementation mode

[0037] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0038] The dual Beidou anti-interference device in the daily production process of the floating platform provided by the present invention has a structural schematic diagram as Figure 1 shown, and includes an electromagnetic shielding blade 1, a rotating steel bar 2 and a base 3.

[0039] As Figure 2 shown, the electromagnetic shielding blade 1 is composed of a lightweight steel plate 11 and paint film layers 12 and 13 coated on two surfaces. A total of three electromagnetic shielding blades 1 are provided, and the three electromagnetic shielding blades 1 are exactly the same. The blade is 1 meter long, 0.5 meter wide and 0.01 meter thick. The material composition of the lightweight steel plate 11 is: by weight percentage: C 0.003 - 0.004%, Al ≤ 0.003%, O ≤ 0.003%, Si 1.0 - 2.0%, N ≤ 0.003%, Ti ≤ 0.003%, and the balance is Mn, Cr, P and other metals and impurities; the thickness of the paint film layers 12 and 13 is 25 - 28 um, and they are formed by coating with special electromagnetic shielding paint. The electromagnetic shielding blade 1 is welded and fixed on the rotating steel bar 2, and the three electromagnetic shielding blades 1 are distributed at an angle of 120 degrees in space. The length of the rotating steel bar 2 is 1.2 - 1.5 meters, and the weight is 4 - 5 kg.

[0040] As Figure 3 and Figure 4As shown in the figure, the base includes a rotating plate 31, a U-shaped box 32, a limiting block 33, an annular support 34, a large gear 35, an annular positioning support 36, a support shaft 37, an annular counterweight 38, a rotating shaft 39, a motor 3_10, and a small gear 311. Specifically, the rotating shaft 39 is arranged on the support shaft 37. An annular support 34, a large gear 35, and an annular positioning support 36 are successively arranged on the outer peripheral wall of the rotating shaft 39 from top to bottom. The top of the annular support 34 and the rotating shaft 39 are matched with the rotating plate 31 through the limiting block 33. The support shaft 37 is arranged at the bottom of the U-shaped box 32. An annular counterweight 38 is arranged at the bottom of the U-shaped box 32. Four identical motors 3_10 are arranged on the annular counterweight 38. Among them, the rotating steel bar 2 is welded on the rotating plate 31 of the base 3. After being powered on, the four motors 3_10 respectively drive the four small gears 3_11 to rotate. Since the small gears 3_11 are meshed and matched with the large gear 35, the small gears 3_11 drive the large gear 35 to rotate, thereby driving the rotating shaft 39 to rotate. The rotating shaft 39 drives the rotating plate 31 to rotate, thereby driving the rotating steel bar 2 and the electromagnetic shielding blades 1 to rotate.

[0041] In the dual-Beidou anti-interference device of the present invention, the electromagnetic shielding coatings forming the paint film layers 12 and 13 are made of epoxy resin as the matrix resin, adding conductive fillers, coupling agents, additives, curing agents, and solvents. Among them, the epoxy resin is polyurethane-modified epoxy resin, the conductive filler is silver-plated copper powder or graphene, the coupling agent is a silane coupling agent, the additives include deacetylated chitin, benzoxazole antioxidants, and SiO2 anti-settling agents, the curing agent is boron trifluoride, and the solvent is acetone and ethyl acetate. The specific formula by mass percentage is as follows: the addition amount of epoxy resin is 25% - 31%, the addition amount of conductive filler is 35% - 60%, the addition amount of coupling agent is 3%, the addition amount of deacetylated chitin is 2% - 5%, the addition amount of benzoxazole antioxidant is 2% - 5%, the addition amount of SiO2 is 3% - 6%; the addition amount of curing agent is 10% - 25%; the addition amount of solvent is 10% - 25%, and it specifically needs to be determined according to the amounts of the matrix resin, conductive filler, coupling agent, and additives. The specific preparation process: Mix the coupling agent and additives according to the formula amount, add part of the solvent, stir evenly, then successively add the conductive filler and the matrix resin, disperse evenly and grind into powder, add the remaining solvent and curing agent according to the formula ratio, and activate for 4 hours.

[0042] The electromagnetic shielding performance of the dual-Beidou anti-interference device of the present invention mainly depends on the electromagnetic shielding coatings (paint film layers 12 and paint film layer 13) of the electromagnetic shielding blades 1. The indicators characterizing the performance of electromagnetic shielding materials mainly include resistivity and shielding value. The smaller the resistance, the better the conductivity of the material, and the better the electromagnetic shielding performance. The higher the shielding value, the better the electromagnetic shielding performance. The following is the test composition and the resistivity and shielding value of the paint film layer with a thickness of 25um:

[0043] The addition amount of polyurethane-modified epoxy resin is 26%, the addition amount of conductive filler (copper powder) is 37%, the addition amount of silane coupling agent (3-aminopropyltriethoxysilane) is 3%, the addition amount of deacetylated chitin is 3%, the addition amount of benzoxazole antioxidant is 2%, the addition amount of SiO2 is 4%; the addition amount of curing agent is 10%; the addition amount of solvent is 15%.

[0044] The volume resistivity of the coating is measured to be 0.001 Ω·cm by the four-probe method, indicating that the material has good electrical conductivity.

[0045] The shielding effectiveness of the shielding material is tested by the coaxial test method. PVC board is selected as the substrate, and the electromagnetic shielding coating is evenly sprayed on the PVC board. After drying at 50 °C for 36 hours, it is cured, and the shielding value is detected after curing. To cover the Beidou frequency band, the electromagnetic shielding effectiveness of the test device in the 1000 MHz - 1.5 GHz frequency band is selected. The test results are obtained by using the coaxial test equipment for shielding effectiveness. The test results show that in the 1000 MHz - 1.5 GHz frequency band, the shielding value of this shielding material is 40 - 55 dB, as Figure 5 shown.

[0046] When the above device is used for dual-Beidou anti-electromagnetic interference during the daily production process of an offshore floating platform, first determine the length of the rotating steel bar 2 of the device according to the installation height of the Beidou device, so as to ensure that the installation height of the Beidou antenna and the vertical center height of the electromagnetic shielding blade 1 are on the same horizontal plane; place the anti-interference device in the middle of the installation positions of the two Beidou terminals, and the distances from the two Beidou terminal antennas are equal; power on the device, and after the motor 3_10 in the base 3 is powered on and runs, drive the small gear 3_11 to run, and then the large gear 35 rotates, driving the rotating plate 31 to start rotating at a constant speed, and then the electromagnetic shielding blade 1 starts rotating at a constant speed. Due to the constant rotation of the blades of this device, the Beidou terminal antenna can receive signals from different directions, while shielding electromagnetic interference, ensuring the satellite acquisition effect of the Beidou terminal antenna.

Claims

1. A dual-Beidou anti-interference device during the daily production process of a floating platform, comprising electromagnetic shielding blades, rotating steel bars, and a base; The rotating steel bars are fixed to the base; Three identical electromagnetic shielding blades are arranged on the rotating steel bars; Centered on the rotating steel bars, the electromagnetic shielding blades are arranged at equal intervals; The base can rotate to drive the electromagnetic shielding blades to rotate; The electromagnetic shielding blades include lightweight steel plates and paint film layers coated on both surfaces of the lightweight steel plates; The composition of the material forming the paint film layer is as follows: Made with epoxy resin as the matrix resin, adding conductive fillers, coupling agents, additives, curing agents, and solvents; The epoxy resin is polyurethane-modified epoxy resin; The conductive filler is silver-plated copper powder or graphene; The coupling agent is a silane coupling agent; The additives include deacetylated chitin, benzoxazole antioxidants, and SiO2 anti-settling agents; The solvents are acetone and ethyl acetate; The curing agent is boron trifluoride; By mass percentage, among them, The addition amount of the epoxy resin is 25% - 31%, the addition amount of the conductive filler is 35% - 60%, the addition amount of the coupling agent is 3%, the addition amount of the deacetylated chitin is 2% - 5%, the addition amount of the benzoxazole antioxidant is 2% - 5%, the addition amount of the SiO2 is 3% - 6%, and the addition amount of the curing agent is 10% - 25%; The thickness of the paint film layer is not less than 25um.

2. The dual-Beidou anti-interference device according to claim 1, characterized in that: The thickness of the paint film layer is 25 - 28um; The elemental composition of the light steel plate is as follows: C 0.003 - 0.004%, Al ≤ 0.003%, O ≤ 0.003%, Si 1.0 - 2.0%, N ≤ 0.003%, Ti ≤ 0.003%, and the balance is Mn, Cr, P metals and impurities.

3. The dual-Beidou anti-interference device according to claim 1 or 2, characterized in that: The length of the rotating steel bar is not less than 1m; The weight of the rotating steel bar is 4 - 5kg.

4. The dual-Beidou anti-interference device according to claim 3, characterized in that: The length of the rotating steel bar is 1.2 - 1.5m.

5. The dual-Beidou anti-interference device according to claim 1 or 2, characterized in that: The base includes a rotating plate, a U-shaped box, and an electrified rotating device; The rotating shaft is arranged on the support shaft. An annular support, a large gear, and an annular positioning support are successively arranged on the outer peripheral wall of the rotating shaft from top to bottom. The annular support and the top of the rotating shaft are matched with the rotating plate through a limiting block; The support shaft is arranged at the bottom of the U-shaped box; An annular counterweight is arranged at the bottom of the U-shaped box. A motor is arranged on the annular counterweight. The output shaft of the motor is connected to a small gear, and the small gear is meshed and matched with the large gear.

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