According to the low orbit altitude and the geometric model of the satellite, we have designed a radio frequency permeable sunshade for the satellite, which can prevent light from reaching all the diffuse parts of most satellite bodies and bodies. The visor is laid flat on the chassis during launch and unfolded during satellite separation from Falcon 9. The sunscreen completely blocks the light from reaching the antenna, thus preventing the light from being reflected from the diffuse antenna. This method not only avoids the thermal effect of the darkening of the antenna surface, but also has a greater impact on the brightness reduction. As mentioned earlier, the first VisorSat prototype was launched with the eighth batch of star chains, and we will install these black mirror sunshades on all satellites after June.
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Development of high-quality directly buried polyurethane insulation pipe based on quality matters needing attention in the construction of Shaoshan prefabricated directly buried insulation pipe: 1. The soaking of groundwater and Rain Water should be avoided during construction. If the end is inadvertently immersed in water, drying treatment should be done before connecting the jacket. 2. The pipe should be stored in a flat site, neatly placed, and the height of the pipe should be less than m. 3. Pipe hoisting is light and light, collision and throwing are prohibited, and straight hoisting of steel wire rope is prohibited. 4. The thermal insulation layer and anti-corrosion coating should avoid direct contact with flame. For on-site installation, please follow the following procedures: pipe trench excavation-base treatment (drainage, sand cushion)-lower pipe-steel pipe welding-inspection (water pressure)-installation (pressure test)-foaming-sealing foam cell. Joint installation, the heat preservation work of the joint is carried out on the project site, including the installation of the joint outer casing, the connection and sealing of the joint outer casing with the supervisor and the foaming work of the on-site joint, but does not include the welding of the joint part of the steel pipe.
Structural mechanism: 1. High-density polyethylene anticorrosive coating: high-density polyethylene pipe protects elbows from corrosion and plant corrosion and prolongs the service life of pipe fittings. Support the working pipe and be able to bear a certain external load to ensure the normal operation of the working pipe. 2. Polyurethane foam layer: resistant to high temperature, ensure medium temperature, keep the surface of the outer pipe at room temperature, keep the inner working pipe insulated, and ensure that the foam is not carbonized. 3. Working steel pipe: ensure the normal flow of the conveying medium. Elbow and joint installation can send personnel to the project site to carry out the heat preservation work of the joint, including the installation of the outer casing of the joint, the connection and sealing of the outer casing of the joint with the supervisor, and the foaming work of the on-site joint, but it does not include the welding of the steel pipe of the joint. Our company takes “international market as the orientation, science and technology as the leader, the pursuit of high quality, sincere for users” as the business purpose.
The pipe end is machined to control the verticality of the end face, the groove angle and the obtuse edge. Joint installation? The company can go to the project site to carry out the heat preservation work of the joint, including the installation of the outer casing of the joint, the connection and sealing of the outer casing of the joint with the supervisor and the foaming of the on-site joint, but does not include the welding of the steel pipe of the joint. In the third case, sometimes the wrong side of the spiral pipe will be caused by the hard bending of the steel strip during the butt joint, which is caused by the poor shape and dimensional accuracy of the head and tail of the steel strip when the edge is not cut.
Jiang Yi graduated from the high-star hotel operation and management major of Sichuan Tianfu New District Vocational School in 2014 and was promoted to the exhibition service and management major of Chengdu Vocational and Technical College in 2017. He is currently the on-site supervisor of Tianfu New District Branch of Chengdu Zonglian Exhibition Logistics Co., Ltd.