The high and low temperature box can set ultra-low temperature, high temperature, test time, and program process at one time, and is executed by the machine and equipment autonomously. It is a testing equipment for airlines, vehicles, household appliances, scientific research, etc. The main parameters and characteristics of industrial, electronic devices and other commodities and raw materials after high temperature, ultra-low temperature, or uniform motion test are destroyed.

1. The main parameters of temperature cycle in-situ stress:

There are 6 main parameters:

① limit the temperature;

② lower temperature;

③Temperature transition rate;

④ Limit the time of thermal insulation and heat preservation;

⑤Lower value temperature insulation time;

⑥ Cycle frequency.

2. The principle of ineffectiveness caused by the stress caused by temperature cycle and the photoresistor: The temperature cycle makes the expansion of different raw materials with different melting points different, resulting in separation and cracking. Its photoresistor such as paint coating layer Wait.

A. The temperature cycle makes the screw connection or the riveted joint loose, and the photoresistor such as the screw, the riveting member, etc.;

B. The temperature cycle relaxes the press-fit connectors with insufficient mechanical equipment support; the temperature cycle of the high and low temperature test alternately changes the temperature cycle of the test chamber to increase the resistance of the fiber welding circuit with poor material or cause the lead path, and its photoresistors such as resistor components, etc.;

C. The temperature cycle erodes the contact point and pollutes the environment, and its photoresistor such as alloy products, etc.

3. Analysis of temperature cycle stress characteristics: In the temperature cycle test, the cyclone uniformity in the high and low temperature test cycle test chamber is a very important main parameter, which will affect the temperature transition speed of the product. This requires several When two test products are tested at the same time, there should be a moderate distance between the test products and the test chamber wall, so that the cyclone can circulate freely between the test products and the chamber wall.