Hitachi square oil cup is an important accessory for lubrication and maintenance in the elevator system. Its main function is to provide lubricating oil for elevator guide rails, pulleys, and other components, reduce friction and wear, and improve the operating efficiency and safety of the elevator; the oil cup has good sealing performance to prevent lubricating oil from leaking and external impurities from entering; the oil cup is usually installed at the top or bottom of the elevator car, as well as at the corresponding position of the counterweight device, to lubricate the elevator guide rails.