A screw jack is a common mechanical component with a simple structure and easy installation, suitable for various working conditions with minimal environmental requirements, thus it is increasingly widely used. The temperature rise has an impact on the use of screw jacks, and many customers ask us how to measure the temperature rise of a screw jack during operation. Today, our technical staff will tell you how to address this issue:

In most cases, during the operation of screw jacks, the temperature rise of individual components can be measured using the resistance method and thermometer method.

Resistance Method: The resistance value of metal conductors increases correspondingly with the rise in temperature. Within a certain temperature range, there is a certain functional relationship between the resistance value and the temperature. By applying this principle, the temperature of the winding can be determined by measuring its resistance value, which is known as the resistance method of temperature measurement. When using the resistance method, first, the resistance value of the winding's cold-state DC resistance (R1) is measured using a Wheatstone bridge, and the ambient temperature (room temperature) at that time is recorded. After the reducer has been running for a period of time, the hot-state DC resistance of the winding (R2) is then measured, and by substituting it into the formula, the temperature of the winding (c2) can be calculated.

Thermometer Method: This is a simple direct method for measuring temperature, commonly using an alcohol thermometer. During measurement, the thermometer can be placed closely against the surface of the bearing being tested or the stator iron core, and the temperature reading can be taken. For measuring the winding temperature, the thermometer can be inserted into the lifting crane's hoist bolt hole. The measured temperature is the winding surface temperature, and adding the temperature difference at the hot spot (for B-grade insulation, take 10°C) gives the hot spot temperature of the reducer winding. Subtracting the environmental temperature from the crane's temperature results in the temperature rise of the reducer.