Research on New Cutting-type Anti-climbers for Urban Rail Transit Vehicles

[Objective] Currently, the CAC (cutting-type anti-climber) faces the issue of excessively high initial peak cutting force, leading to cutting tool detachment or fracture and finally the anti-climber failure. Moreover, the existing double-cutting type anti-climbers are prone to the accumulation of internal chips within the pipe. Therefore, the study on new CAC for urban rail transit vehicles is necessary. [Method] First, a CAC finite element model is established. The simulation results of CAC cutting force and collision energy absorption are compared with the experimental results in relevant literature to verify the accuracy of the finite element model simulation method. The working principles of the honeycomb composite CAC and the improved internal-external double CAC are introduced. The cutting performance of two new CAC devices is analyzed through finite element model simulation calculations. [Result & Conclusion] Setting an induction groove at the position where the CAC initial peak force occurs can effectively reduce the peak force. The depth of the induction groove should not be less than the cutting depth for optimal results. But excessive width of the induction groove increases the secondary peak force and causes significant fluctuations in cutting force after the cutting tool passes through the induction groove. In comparison with the conventional drawer-type honeycomb anti-climbers, the honeycomb composite CAC not only exhibits excellent energy absorption capacity, but also allows for component replacement, making them reusable. The new internal and external double CAC can smoothly discharge the chips from the pipe, thereby avoiding the chip accumulation. Compared to a single CAC, the new internal-external double CAC demonstrates superior energy absorption performance.