Household elevators are hydraulic-driven elevators. Hydraulic elevator is an elevator that pushes oil into the cylinder to make the plunger move in a straight line, directly or indirectly through the wire rope or chain to make the car move. Hydraulic elevator is a product of mechanical, electrical, electric and hydraulic integration. It consists of the following relatively independent but interrelated systems. Pumping station system, hydraulic system, guidance system, car, door system, electrical control system, safety protection system. Hydraulic elevators are widely used in public places such as shopping malls, office buildings, parking lots, stations and airports in recent years because of their smooth operation, comfort, low noise, high utilization ratio of parallel lanes, large load tonnage and flexible machine room settings.