With the rapid development of China's water conservancy and hydropower industry, especially the implementation of the National South-to-North Water Diversion Project, the requirements for “automatic monitoring of unattended, few people on duty” and safety monitoring of water conservancy facilities are also increasing.

The traditional hoist monitoring uses the load pressure sensor to directly measure the pull/pressure to realize the overload protection of the motor load. This method is not only difficult to install and maintain, but more importantly, the core component of this type of sensor - pressure Sensitive components are highly susceptible to environmental disturbances such as drift caused by outdoor temperature, damage caused by vibration, and aging of the adhesive layer caused by long use time. In addition, because the range of force measured by the application equipment is relatively wide, the accuracy of the direct force measurement type is low, and it is difficult to meet the application requirements of the field.