The Cooling bed is a working table for effective cooling of rolled products (rebar, garden steel, steel pipe, etc.) in the metallurgical rolling industry. Cooling bed consists of mechanical drive system, water cooling system, Cooling bed working surface, fixed support and other aspects. The main types of Cooling bed are rack and pinion type Cooling bed, rack and pinion stepping type Cooling bed, pawl type Cooling bed, carrier chain type Cooling bed, roller plate type Cooling bed, etc. Step cooling bed, a Cooling bed consisting of fixed and movable rack and pinion shaped supports, is a pipe, bar and small material cooling equipment that moves the rolling material on fixed rack and pinion step forward by the action of movable rack and pinion and is cooled by flowing air or forced ventilation. If the manufacturer of step cooling bed in the process of production and installation, if the use of the requirements and the working principle is not understood and skilled, it will encounter certain difficulties in the process of manufacturing and installation, and even the wrong manufacturing and installation, not only to reduce production efficiency, but also a lot of wasted resources. The so-called rack and pinion stepper cooling bed is in the process of pipe, bar continuous rolling production line, an important auxiliary equipment, is an indispensable and important component of the production process, rack and pinion stepper cooling bed with high-speed, continuous rolling, tangential rolling, automation and other advantages, in today's cooling bar, pipe and some small need for cooling equipment is widely used, effectively enhance the production efficiency. However, due to the complex structure of rack and pinion stepper Cooling bed and the large tonnage required to be set up in use, it also causes the difficulty in manufacturing and installation of rack and pinion stepper Cooling bed to be enhanced.