Abstract: A buffer unit for the slewing platform of the tamping machine, comprising a slewing plafform, a slewing bearing and a chassis, the upper end of the said slewing bearing connects to the slewing plafform and the lower end of said slewing bearing connects to the chassis, the slewing platform can revolve around the chassis 360 degrees, further comprising a annular supporting slab, a hydraulic cylinder and a connecting rod, the annular supporting slab is fixed on the chassis by bolt. The hydraulic cylinder is fitted on the rear end of the central plane of the slewing platform, the piston rod head of the hydraulic cylinder connects to said connecting rod. The connecting rod can touch and support the annular base slab at any point of the direction of 360 degrees rotation when the hydraulic cylinder extends.

Abstract: A mobile rear counterweight device for crawler crane is provided wherein comprising: a slide rail, mounted at the rear of the crawler crane, and one end of the slide rail is connected with the rear of the main platform while the other end of the slide rail is connected with a mast by a pull rod; and, a hoist driving mechanism and a trolley driven by the mechanism, one end of the said mechanism is connected with the end of the slide rail which is near the rear of the main platform, the other end of the mechanism is connected with the trolley, the said trolley bearing counterweight block is mounted on the slide rail.

Abstract: The present invention relates to a crane jib transition structure, mainly including a jib section, a transition section and a supporting structure, wherein, said jib section matches with said transition section, and they fixedly connect to each other, the upper end of said supporting structure fixedly connects to the upper end of the side of said jib section, the bottom end of said supporting structure fixedly connects to the bottom end of the corresponding side of the transition section, the middle part of said supporting structure fixedly connects to the connection point between the side of jib section and the corresponding side of transition section.