Define the standard of problem points in the transformation of automation equipment: find out the design points of functional errors caused by thermal expansion and cold contraction;

When the temperature changes greatly, the functional design point of automation equipment transformation materials changes.

The design points of different parts of the same mechanism in the transformation of automation equipment are not synchronized due to different temperatures;

Clear standards for knowledge points: dysfunction caused by thermal expansion and cold shrinkage of materials;

The coefficient of thermal expansion of different materials in the transformation of automation equipment is different, which will lead to coordination problems and dysfunction;

In the transformation of automation equipment, when the thermal deformation is blocked, the thermal stress of components;

The cumulative deformation is proportional to the component size.

Criteria for reducing structure of automation equipment transformation: the thermal expansion of a single component is required, and the thermal expansion of each component in automation equipment transformation can be offset by the combination of components;

Criteria for additive structure of automation equipment transformation: for the problem of structure matching caused by different relative thermal deformation, one structure is decomposed into two components with different expansion coefficients by adding an intermediate transition structure, so that the combined expansion effect is consistent with the other component;

Adjustment principle of transformation direction of automation equipment: transfer the expansion direction to the non matching surface through structural design;

Law of eliminating temperature difference: automatic equipment transforms two components of the same material. Due to different temperatures, the degree of expansion and thermal deformation are also different.

Solution: make the heat transfer boundary conditions of relevant parts of automation equipment transformation as close or the same as possible;

Free expansion criterion: when the thermal expansion is blocked, the thermal stress is destructive, and the expansion stress shall be fully released during the transformation design of automation equipment;

Compliance criteria: in the transformation of automation equipment, when the thermal deformation of two parts cannot be eliminated, the flexibility of parts shall be increased to reduce the thermal stress. For example, using hose and rubber materials, the linear direction of thermal stress is changed to the bending direction.