On December 25th, Beijing Interplanetary Glory Space Technology Co., Ltd. successfully completed Focus One (hereinafter referred to as "JD-1") reusable liquid oxygen methane engine 500-second full-system long-range test run. This is the first domestic liquid oxygen methane engine to break through the 500-second single-system full-system test run and enter the reliability growth test phase, which means that this type of engine breaks through the major node of product delivery and application, and will achieve the first domestic reusable liquid carrier in 2020. The rocket's 100km vertical take-off and landing test laid a solid technical foundation. It is understood that the 500-second long-distance test run covers the entire process of pre-cooling, start-up, main-level conditions, shutdown and post-reuse simulation processing; during the test, the engine ignition, start-up and shutdown timings are normal, and the engine's main-level conditions room Parameters such as pressure, temperature, turbine speed, and vibration are stable and meet the design requirements; the test run time lasts 500 seconds, and the test is a complete success. JD-1 is a 15-ton reusable liquid oxygen methane engine independently developed by Interplanetary Glory. It is the key to the recovery and reuse of launch vehicles. The engine design can be reused up to 30 times, saving more than 70% of the manufacturing cost of the rocket and greatly reducing the cost of space exploration. Interplanetary Glory introduced that JD-1 has high engineering application value, and its functions can cover multi-mission requirements such as deceleration, landing, long-term on-orbit, deep space detection, etc., and it has strong adaptability to the mission. According to the introduction of Interplanetary Glory, the JD-1 engine achieved a major breakthrough in the 200-second test run in the prototype stage, and completed the transition phase in August 2019, and officially entered the initial prototype stage. This test product is the first product of JD-1 in the initial prototype stage. It completed the whole system long-distance 500 second test run at one time, which fully verified the correctness of the JD-1 engine technical solution and the reliability of the product. Its reliability is mainly reflected in the following aspects: 1. Turbine pump dynamic seals and bearings passed the 500-second long-range life assessment of the whole machine. Analysis and inspection showed that the functions and performance of core components such as dynamic seals and bearings met the design requirements; 2. The thrust chamber of the combustion core component has worked for a long time of 500 seconds, and the performance parameters are consistent with the design requirements. No ablation of the nozzle and the inner wall and other key parts; 3. After 500 seconds of real vibration and thermal environment assessment of each valve assembly, the action is normal and the timing consistency is high; 4. After 500 seconds of real vibration and thermal environment assessment of the engine assembly structure and the duct, the product structure and seal work normally without abnormal vibration frequency. Compared with the 200-second test run, the 500-second long-range test has greatly increased the requirements for product reliability verification. Through this long-distance 500-second test run, the reliability of the JD-1 engine system and products has been 100% verified, which means that this type of engine has entered the stage of reliability accumulation, and mass production and batch 500-second long-range test run can be carried out. According to the previously announced news of Interstellar, the JD-1 engine will be assembled on the first reusable liquid oxygen methane launch vehicle "Hyperbola II". Hyperbola 2 is an internationally competitive reusable small liquid carrier rocket independently developed by Interplanetary Glory. It has a takeoff weight of approximately 90 tons, a maximum near-Earth orbit carrying capacity of 1.9 tons, and a 500km SSO orbit carrying capacity of 1.1 tons Recycling) /0.7 tons (recyclable). The rocket is scheduled to perform a one-stage "parabolic" 100-kilometre vertical take-off and landing test of the rocket in 2020, and its first orbital launch mission in 2021 will fill the gap in China's reusable liquid carrier rocket. Prior to this, Interstellar has successfully completed China's first civilian-operated rocket launch mission, becoming the first private company in Asia and the third in the world to independently develop and successfully launch a launch vehicle. Furniture handles have a strong aesthetic effect on the appearance of furniture. This is because the choice of furniture handle has an important relationship with the shape, color and position of the furniture. Therefore, it is very important to choose furniture handles. The door handles with good quality and good style are not only convenient to use, but also add the finishing touch to the overall beauty of the cabinet. 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