The FEM model of the rear defend device of a truck is founded and the impact simulation is done.

The protecting device at back bottom is an important means of preventing cars from colliding the vans from behind on highways,but at present the application of this device is commonly from satisfaction,resulting in serious social danger and losses.

Talking about the safety protection device of mechanical equipment;

The design idea of protection device for car's running away of inclined shaft based on PLC was introduced in the paper.

This paper describes a novel rotary protection device design and its application to certain laser warning equipment.

Then the damage process and energy absorbing are obtained,which are of great value for this kind of pier protective devices design.

The static strength test system of protective devices on tractor is a special equipment that simulates and evaluates the protection to the driver of the protective devices on tractor when the tractor rolls over through the applied load.

Aimed at the running car accident in the course of enhancing steep roadway,the author has made research and analysis and proposed a protective device of FJB-A bi-residual normally-closed steep well running car be installed in steep roadway,which can ensure the safety of enhancing steep roadway.

By means of the dynamic non-linear finite element method and according to the requirement of the rear underrun protective device stipulated in national standard GB11567.

Design and Manufacture of the Lathe's Safeguard in Metalworking Practices Teaching;