2.1 The role of climate and comprehensive environmental test equipment

      The rapid development of modern society and complex external environmental changes such as temperature, humidity and air pressure have put forward higher requirements for the ability of industrial products to adapt to the climate environment encountered during storage, transportation and use. The climate test mainly provides the temperature, humidity and air pressure loading stress test of the test product, investigates the influence of climate on various performance indicators of the product, exposes the defects in the design, manufacture, storage, transportation and use of the product, and verifies that the product is in Adaptability to specific climatic environmental conditions and predict product work, shelf life, etc. Climate test equipment is a combination test that simulates harsh environments by artificial methods in a special space, and collects and analyzes test data. At the same time, with the requirements of downstream customers for product environmental testing, environmental testing and testing equipment with multiple stresses applied at the same time have become a development trend. In the past, the environmental test equipments were independent of each other, and only provided single-stress environmental tests for customers. But now downstream customers are more demanding "temperature and humidity + thermal shock", "temperature and humidity + explosion-proof", "temperature and humidity + low pressure", "temperature and humidity + vibration", "temperature and humidity + salt spray", "temperature and humidity + salt spray", "temperature and humidity + low pressure" "Humidity + Light", "Temperature Humidity + Noise" and other comprehensive tests.

      2.2 Types and classifications of climate and comprehensive environmental test equipment

      There are many types of climate and environmental test equipment, typical products include temperature and humidity, low pressure, thermal vacuum, salt spray, sunlight, sand and dust, explosion-proof, comprehensive test chamber, corrosion resistance, fatigue test, aging and monitoring test system, space environment simulation system, Climate environment simulation engineering system, etc. The comprehensive environmental test equipment integrates the aforementioned single-stress environmental tests according to customer needs and feasibility, such as four comprehensive environmental test systems for vibration, temperature, humidity, and low pressure. Western countries started early in the research and development of climate test equipment such as temperature and humidity. After World War II, countries such as the United States, Germany and Japan recognized the importance of the environmental adaptability of weapons and equipment, and established a large number of environmental test stations in their own countries and around the world. Covering various typical natural environment conditions all over the world, large-scale and systematic environmental tests are carried out and used as a necessary means to identify products. Therefore, the research and development and production technology of climate test equipment such as temperature and humidity for the test have been developed rapidly, and a considerable scale of environmental research and development and production enterprises have been born one after another, and they have strong research and development capabilities. The overall technology of its products The level has always led the development of the industry, and a relatively complete industrial chain system has been formed. Due to the late start of environmental test technology in my country, environmental test technology, test conditions, test procedures, product test requirements and standard formulation and revision have basically been paid attention to and carried out since the 1970s, and a basic system has been formed. After the reform and opening up, with the development of science and technology and the needs of national defense science and technology, environmental test technology has developed rapidly, and the related test technology and standard system for civil and military use has basically been formed. Therefore, the research and development of climate and comprehensive environmental test equipment started relatively late. In the early stage, due to the restriction of the overall technical level of the country, it was mainly realized in terms of function; in recent years, with the progress of science and technology, climate and comprehensive environmental test equipment also Great technological development and progress have been made.