Page 60 - Wire Rope News & Sling Technology - February 2020
P. 60

INVENTOR’S CORNER
         continued from previous page                         is installed between the lift car and guide pulley. Both the
                                                              tractor and guide pulley are disposed above the lift car.
                                                              The tractor is located below the guide pulley. One end of
                                                              the wire rope connects to the top of the counterweight de-
                                                              vice, and the other end connects to the top of the lift car
                                                              after passing through the guide pulley and a traction wheel
                                                              on the tractor successively. To make the tractor arranged
                                                              in the middle, the guide pulley bears the majority of the
                                                              weight of the lift car and counterweight device, while the
                                                              tractor only bears the minority of the weight of the lift car
                                                              and counterweight device. It can effectively reduce the load
                                                              borne by the tractor and greatly improve the service life of
                                                              the tractor.
                                                               As shown in figure 4, the embodiment discloses a middle-
                                                              drive type elevator, it comprises a lift car 1, a tractor 2, a
                                                              wire rope 3, a guide pulley 4 and a counterweight device 5,
                                                              wherein: the tractor 2 is installed between the lift car 1 and
                                                              the guide pulley 4; both the tractor 2 and the guide pulley 4
                                                              are disposed above the lift car 1, and the tractor 2 is located
         Figure 3:. Illustrates one embodiment of a subsea deployment basket,   below the guide pulley 4; one end of the wire rope 3 connects
         from a top view.
                                                              to the top of the counterweight device 5, and the other end
         tween an underwater vehicle and a subsea device, such as a   connects to the top of the lift car 1 after passing through
         subsea basket. The present disclosure solves prior art docking   the guide pulley 4 and the traction wheel 6 on the tractor 2
         and transfer difficulties in part by utilizing a vertical eleva-  successively.
         tor system that moves a plurality of different seismic nodes   Further more, the tractor 2 is located below the guide pul-
         (whether located on support sides, trays, node holders, or   ley 4. As an optimization, the tractor 2 is located at the lower
         platforms) between different vertical heights to a single verti-  right of the guide pulley 4; at the same time, the lift car 1 is
         cal height within the subsea basket for transfer of those seis-  located at the lower right of the whole elevator system; and
         mic nodes to the ROV at that particular vertical height. Thus,   the counterweight device 5 is located at the lower left of the
         for a single docking position (or docking step), a plurality of   whole elevator system.
         separate levels of seismic nodes (such as a plurality of sepa-  The emphasis of the above-mentioned design is that it can
         rate trays or node holders) may be transferred to the ROV,   minimize the load borne by the tractor 2 to prevent the trac-
         thereby eliminating multiple docking positions for a subsea   tor 2 from bearing the majority of the load under the cur-
         basket and multiple docking steps. The disclosed elevator as-  rent technology, so as to transfer the load of the lift car 1
         sembly is not limited to a particular docking or transfer mech-  to the guide pulley 4 in the elevator system. At the same
         anism, and a wide variety of docking or transfer mechanisms   time, because the manufacturing cost of the guide pulley 4
         of the ROV may be used to couple and/or transfer the seismic
         nodes from the subsea basket of the present disclosure.
           Figures 2 and 3 illustrate one embodiment of a subsea de-
         ployment basket of the present application, from a side and
         top cross-sectional view, respectively. Subsea deployment
         basket 200 is configured to hold a plurality of autonomous
         seismic nodes 2 in a plurality of trays 221 within a plural-
         ity of platforms or bays 211. Each platform or bay 211 (and
         subsequently the coupled tray) is positioned at a different
         vertical position within frame  201 of the basket. In some
         embodiments, a tray is not used and each particular level or
         bay may comprise a plurality of rails on which the seismic
         nodes sit. Subsea deployment basket 200 may be substan-
         tially similar to subsea deployment basket  101 in that it
         can be lowered from a surface vessel and coupled to an un-
         derwater vehicle (such as an ROV) to transfer autonomous
         seismic nodes (or another subsea payload) to and from the
         underwater vehicle.  In other embodiments, subsea basket
         200 may be a structure permanently located on the seabed,
         coupled to a subsea device that may be lowered/raised from
         and to a surface vessel, or be coupled to a subsea device that
         is temporarily or permanently located in a subsea position.

         Middle-drive type elevator
         Pat. 10,450,167 U.S. class 1/1 Int. class B66B 11/00
         Inventor: Zhiyong Yang, Shanghai, CN.
         Assignee:  Shanghai Yangtze 3-map  Elevator Co., LTD.,
         Shanghai, CN.
           A middle-drive type elevator has a lift car, tractor, wire   Figure 4:  Schematic diagram of the  integral structure of a middle-
         rope,  guide  pulley  and  counterweight  device.  The  tractor   drive type elevator.

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