Page 62 - Wire Rope News & Sling Technology - August 2019
P. 62

INVENTOR’S CORNER
         continued from previous page                         The work device 25 includes a boom 26, a mast 28, a hoisting
         tilt-angle adjusting  mechanism  15a  and a hydraulic  pres-  accessory 29, a boom guyline 30, and a carrier guyline 32. The
         sure source 22. An electric current is input to the tilt-angle-  boom 26 is attached to a front end portion of the upper swing
         adjustment proportional valve 15b from the main-body-side   body main body 24 to be capable of rising and falling. The
         controller 82. The tilt-angle-adjustment proportional valve   hoisting accessory 29 is suspended from the distal end portion
         15b sets the magnitude of the hydraulic pressure supplied   of the boom 26 via a wire rope as shown in figure 2. A hoisting
         from the hydraulic pressure source 22 to the tilt-angle ad-  cargo is hoisted by the hoisting accessory 29.
         justing mechanism 15a to magnitude corresponding to the   The mast  28 is attached  to the upper swing body  main
         magnitude of the electric current input to the tilt-angle-ad-  body 24 to be capable of swing around a horizontal axis with
         justment proportional valve 15b. Specifically, the tilt-angle-  the proximal end portion (the lower end portion) of the boom
         adjustment proportional valve 15b increases the hydraulic   26 as a fulcrum in a position on the rear side of the boom 26.
         pressure supplied to the tilt-angle adjusting mechanism   The distal end portion (the upper end portion) of the mast 28
         15a as the electric current input from the main-body-side   is connected to the distal end portion of the boom 26 via the
         controller 82 increases. The tilt-angle adjusting mechanism   boom guyline 30. Consequently, the mast 28 supports the
         15a reduces the tilt angle of the swash plate 14a to reduce   boom 26 in an erected state from the back via the boom guy-
                                                              line 30. The distal end portion of the mast 28 is connected to
                                                              the carrier 4 via the carrier guyline 32.
                                                               Note that the “front side” concerning the upper swing body
                                                              7, the carrier 4, and the coupling beam 5 means a side where
                                                              the boom 26 of the upper swing body 7 is provided. The “rear
                                                              side” concerning the upper swing body 7, the carrier 4, and
                                                              the coupling beam 5 means the opposite side of the side where
                                                              the boom 26 is provided. The “right side” concerning the upper
                                                              swing body 7, the carrier 4, and the coupling beam 5 means
                                                              a right side at the time when the upper swing body 7, the
                                                              carrier 4, and the coupling beam 5 are viewed from the rear
                                                              side toward the front side thereof in a state in which the up-
                                                              per swing body 7, the carrier 4, and the coupling beam 5 are
                                                              integrated. The “left side” concerning the upper swing body
                                                              7, the carrier 4, and the coupling beam 5 means a left side
                                                              at the time when the upper swing body 7, the carrier 4, and
         Figure  4: Functional  block  diagram  of a control system  of the   the coupling beam 5 are viewed from the rear side toward the
         mobile crane.                                        front side thereof in a state in which the upper swing body 7,
                                                              the carrier 4, and the coupling beam 5 are integrated.
         the discharge flow rate of the hydraulic oil of the hydraulic
         pump 14 according to the increase in the supplied hydraulic   Detection device and method for improving layer-to-
         pressure. The value of the electric current input to the tilt-  layer transition of steel wire ropes
         angle-adjustment proportional valve 15b and the discharge   Pat. 10,288,549 U.S. class G01N 19/02 Int. class G01N 19/02
         flow rate of the hydraulic oil of the hydraulic pump 14 are in   Inventor: Yuxing Peng, Jiangsu, CN., Zhencai Zhu, Jiangsu,
         a linear proportional relation.                      CN., Wenxue Xu, Jiangsu, CN., Zhiyuan Shi, Jiangsu, CN.,
           The upper swing body 7 is mounted on the lower traveling   Xiansheng Gong, Jiangsu, CN., Xiangdong Chang, Jiangsu,
         body 6 to be capable of swing around a vertical axis C1. The   CN.,  Dagang Wang,  Jiangsu,  CN.,  Guohua  Cao, Jiangsu,
         upper swing body 7 includes, as shown in figures 1 to 3, an up-  CN., Songyong Liu, Jiangsu, CN.
         per swing body main body 24 attached on the lower traveling   Assignee: CHINA UNIVERSITY OF MINING AND TECH-
         body 6 to be capable of swing and a work device 25 mounted   NOLOGY, Jiangsu, CN.
         on the upper swing body main body 24. The work device 25 is   Systems and methods for detecting a layer-to-layer transi-
         a device for performing hoisting work of a cargo to be hoisted.   tion of a lifting steel wire rope on a reel are described. The
                                                              system includes a reel assembly for winding a steel wire rope
                                                              on a reel and a tensioning assembly for tensioning a segment
                                                              of said steel wire rope. The system further includes a loading
                                                              assembly and a lead screw sliding assembly. The loading as-
                                                              sembly provides a vertical loading to the tensioning assem-
                                                              bly so as to generate a loading force between the tensioned
                                                              steel wire rope and the steel wire rope wound around the
                                                              reel. The lead screw sliding assembly drives the tensioning
                                                              assembly so as to move on a horizontal guide rail to gener-
                                                              ate a relative displacement between the tensioned steel wire
                                                              rope and the steel wire rope wound around the reel. The ten-
                                                              sioning assembly is connected to the loading assembly via a
                                                              first threaded rod and a static torque sensor.
                                                               As shown in figure 6, a device for detecting layer-to-layer
                                                              transition of a lifting steel wire rope includes a reel assem-
                                                              bly, a steel wire rope tensioning assembly, a steel wire rope
                                                              loading assembly, and a lead screw sliding assembly, where
                                                              the reel assembly is used to wind a steel wire rope around
         Figure 5: Hydraulic circuit diagram of a swing-body driving device.  a reel, and can drive the reel to rotate; the steel wire rope

         62     Wire Rope News & Sling Technology   August 2019
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