Those who understand the installation method and process of a single beam crane may know that the buffer is not used in normal operation. Since the limit switch will be installed in the travel limit position of the large and small vehicles, when the single-beam crane reaches the limit position, the travel switch will act, and the crane will stop before colliding with the safety stop. But the buffer is also an indispensable part, the first consideration is to improve the safety of the whole machine. When the travel limit switch fails, the buffer should ensure that when the single-beam crane collides with the end stop at normal speed, it can absorb enough energy to ensure the safety of the crane.

At present, most of the buffers used on bridges and gantry cranes are rubber buffers and polyurethane foam buffers. The rubber buffer is composed of all rubber or multiple rubber plates, with a simple structure and low manufacturing cost. When a collision occurs, the kinetic energy of the crane is mainly consumed by its own internal friction. Generally used when the crane’s operating speed does not exceed 50M/min.

Polyurethane foam buffer has the advantages of large energy absorption, good cushioning performance, oil resistance, aging resistance, acid resistance, corrosion resistance, high temperature and low temperature resistance, insulation and explosion-proof, low density, light weight, simple structure, low price, no noise, no sparks, etc. The device is convenient to protect and has the characteristics of long service life. Therefore, it has been widely used worldwide. In general cranes, it can replace rubber and spring buffers, and it is more worthy of promotion in explosion-proof places.