Patent ID: 9688513
Date: 2017-06-27
CPC Classifications: B66B

Claim:
1. A special elevator anti-drop buffer based on flexible guide, the anti-drop buffer is used for connecting and fixing an upper end of a brake steel wire rope of an elevator, wherein, the anti-drop buffer comprises an upper support plate, a pulley block comprising a plurality of pulleys, a hydraulic damping buffer, a rope end assembly, and a lower support plate; the lower support plate is fixed to a shaft top platform in a shaftway, the upper support plate is arranged above the lower support plate, the pulleys of the pulley block are arranged on the upper support plate and lower support plate, and the upper end of the brake steel wire rope runs over the respective pulleys of the pulley block and is fixed to the rope end assembly; the hydraulic damping buffer is arranged between the upper support plate and the lower support plate, and comprises an inner hydraulic cylinder and an outer hydraulic cylinder that is concentrically disposed around and coupled to the inner hydraulic cylinder, an upper end of the inner hydraulic cylinder is fixed to the upper support plate, an upper end of the outer hydraulic cylinder is provided with a ferrule, a lower end of the outer hydraulic cylinder is fixed to a base, the base is fixed to the lower support plate, an inner hydraulic cylinder piston is arranged in a cavity of the inner hydraulic cylinder, a spring is arranged between the inner hydraulic cylinder piston and an upper end of the cavity of the inner hydraulic cylinder, an outer hydraulic cylinder piston is arranged in a cavity of the outer hydraulic cylinder, and the outer hydraulic cylinder piston is fixed to the lower end of the inner hydraulic cylinder, an annular sleeve with damping holes runs through a center of the outer hydraulic cylinder piston, and a lower end of the annular sleeve with damping holes is fixed to the base; a first enclosed space is formed between the base and the outer hydraulic cylinder piston and adjacent to an inner circumference of the outer hydraulic cylinder, a second enclosed space is formed by the inner hydraulic cylinder, the inner hydraulic cylinder piston and the annular sleeve with damping holes, the first enclosed space and the second enclosed space communicate with each other via the damping holes on the annular sleeve with damping holes, and the first enclosed space and the second enclosed space are filled with hydraulic oil.