Device, method and system for detecting oil quantity of elevator oil cup

The invention discloses an elevator oil cup oil quantity detection device, method and system, and belongs to the technical field of elevator detection. A roller, a self-powered module, an acquisition module and a processing module are arranged in the elevator oil cup oil quantity detection device, one end of the roller is mounted on a guide rail, and the other end of the roller is connected with the self-powered module; the roller rotates along with the movement of the elevator door to scrape lubricating oil on the guide rail; the self-powered module is connected with the acquisition module and the processing module and supplies power to the acquisition module and the processing module; the acquisition module acquires an elevator oil cup image and sends the elevator oil cup image to the processing module; the processing module carries out edge calculation processing on the elevator oil cup image to obtain the oil quantity of the elevator oil cup, power is continuously supplied to the collecting module through