Both the food delivery elevator and the food receiving elevator are used in restaurants, hotels and other places. Their main function is to send food or tableware from the kitchen or storage room to the dining table or kitchen, and collect the used tableware back to the kitchen or storage room. Therefore, the food delivery elevator and the food collection elevator can travel in the same direction, which can save space and time and improve efficiency.

In addition to food delivery elevators and food collection elevators, there are many other types of elevators, such as passenger elevators, cargo elevators and medical elevators. The use places and functions of these elevators are different, so the opening directions are also different. For example, the passenger elevator needs to be set in two directions, upward and downward, so that passengers can go to different floors; The freight elevator only needs to be set in one direction, because the goods are transported in one direction.