Stationary hydraulic dock leveler are usually installed on platform in the warehouse, which is a kind of special auxiliary equipment for truck cargo loading and unloading goods . The front height of dock leveller can be adjusted according to the height of the truck compartment, and the lap lip is always close to the compartment. All kinds of transport vehicles can smoothly pass through the dock leveler to transport goods between the ground and the compartment of the warehouse. Single button control is adopted and the operation is convenient.