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The buffer of a cantilever crane consists of a top steel plate, soft steel cables, polyurethane elastomer, and connectors. It is characterized in that the top steel plate and the connector are joined together by soft steel cables, with a polyurethane elastomer inserted between them. The said connector is a connecting bolt or a connecting flange. It is a collision-absorbing buffer device designed specifically for cranes, featuring energy-absorbing and shock-damping capabilities; its overall structure is robust and it offers high levels of safety. Introduction to the installation of buffers on cantilever cranes: For movements with limits on amplitude and travel, in addition to installing travel limiters, safety stops and buffers must also be provided at both ends, as required by safety regulations. (1) The safety stops for truck-type jib cranes should be installed at both the top and the base of the jib. In addition to accommodating the working range, consideration should also be given to the length of the truck and the positions required for lifting and adding sections. Buffers are generally installed at both ends of the cart and are made of rubber material. (2) Boom slewing: When the boom is swung, it is crucial to prevent the boom from tilting backward. Therefore, buffers and limit devices that come into action when the boom approaches its extreme position are installed between the boom and the top of the tower; these buffers are usually of spring or hydraulic type. (3) Operational safety stops and buffers: Buffers must be installed at both ends of the operating track; these buffers can be hydraulic or spring-based, as well as made of polyurethane plastic, and they are secured to the track using bolts. A safety stop should also be installed at the end of the track to prevent accidents. These devices are generally installed and configured by the users themselves. (4) The groove-out stop and anti-skip devices for steel wire ropes: Due to changes in the load on the hook and trolley, the tension in the steel wire rope also changes, causing the rope to jump out of the pulley groove. Therefore, a groove-out stop is provided outside the pulley’s rope groove; this stop does not hinder the rotation of the pulley, and the gap between it and the rotating parts is no more than 20% of the rope’s diameter. This arrangement prevents the rope from jumping out of its groove without compressing the steel wire rope. (5) The anti-unhooking device is equipped with a spring cover at the opening of the hook to close this opening; the spring cover can only be opened downward, not upward. When in use, press the spring cover downward to hang the lifting rigging on the hook; since the spring cover springs back automatically, it closes off the opening of the hook, thereby preventing the lifting rope from falling out through that opening. (6) The drum rope retention device is primarily designed to prevent, during the operation of the winch drum, situations where a fault causes the steel wire rope to not be arranged properly on the drum, resulting in the rope slipping over the drum and being cut by external forces, which could lead to accidents. To prevent the rope from falling off the drum, steel bars can be welded to the outside of the drum to form a protective mesh, or steel plates covering half of the drum’s circumference can be welded there for protection.