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continued from previous page                         locking ring 6-6 arranged on one end of the drum 6-1 and a
                                                              bolt assembly arranged on the support 6-3 at the same side.
                                                               The locking ring 6-6 has counter bores arranged in circle,
                                                              the bolt assembly comprises a bolt seat 6-4 fixed to the sup-
                                                              port 6-3 and locking bolts 6-5 connected to the bolt seat 6-4
                                                              by  threaded  fitting,  and  the  locking  bolts  6-5 match the
                                                              counter bores. A handle ring 6-2 is hinged to the drum 6-1,
                                                              so that the tension rope 2 can be wound on the drum 6-1
                                                              conveniently. A shaft encoder 6-8 is mounted on the shaft
                                                              6-7, to measure the released length of the tension rope 2.
                                                              After the tension rope  2 is released, the locking bolts are
                                                              screwed down into the counter bores of the locking ring 6-6
                                                              and tightened up, so as to lock up the tension rope reeling
                                                              device 6 and retain the released length of the tension rope
                                                              2. A pull rope reeling device 9 is arranged below the center
                                                              point of the connecting line between the hoisting sheave 8
                                                              and the winch 7, and the pull rope 4 is wound on the pull
                                                              rope reeling device 9.
                                                               A method for detecting the tension on the guide rope of
                                                              a hanging scaffold in a construction shaft, comprising the
                                                              following  steps  executed sequentially:  a.  the  length  of  the
                                                              guide rope 1 between a winch 7 and a hoisting sheave 8 is
                                                              supposed as l, turning a drum 6-1 of a tension rope reeling
                                                              device 6 to release tension ropes 2, detecting the released
                                                              length of the tension ropes 2 with a shaft encoder 6-8, ad-
         Figure 17: 3D view of the slide device.              justing a slide device 3 to the center point of the guide rope
                                                              1, and screwing down the locking bolts  6-5 of the tension
           Two tension rope reeling devices 6 are arranged at the out-
         er side of the hoisting sheave 8 and the winch 7 in symmetry
         to the center point of a connecting line between the hoist-
         ing sheave 8 and the winch 7 in the direction of the tension
         ropes 2, to regulate and tension up the tension ropes 2. The
         two tension ropes 2 are wound onto the tension rope reel-
         ing device 6 at the corresponding side, and are tensioned up
         by the corresponding tension rope reeling device 6, and are
         arranged parallel to the guide rope 1. The tension rope reel-
         ing device 6 comprises a drum 6-1 and two supports 6-3 ar-
         ranged at the two sides of the end faces of the drum 6-1, and
         the drum 6-1 is mounted between the two supports 6-3 via a
         shaft 6-7 and a bearing. Wherein, a locking structure is ar-
         ranged on the right support 6-3 and the drum 6-1 at the side
         of the right support 6-3. The locking structure comprises a

                                                              Figure 19: Schematic structural diagram of the tension rope
                                                              reeling device.

                                                              rope reeling device 6 into the counter bores in a locking ring
                                                              6-6; b. adjusting the position of a pull rope reeling device 9
                                                              on the ground, till a pull rope 4 is perpendicular to the guide
                                                              rope 1; c. winding the pull rope 4 on the pull rope reeling
                                                              device 9, pulling the slide device 3 to make a displacement
                                                              x in the direction of the pull rope, and logging the tension f
                                                                                                               1
                                                              on a tension sensor 5 mounted on the tension rope 2 and the
                                                              tension f  on a tension sensor 5 mounted on the pull rope 4;
                                                                     2
                                                              d. calculating the tension F on the guide rope 1 with a for-
                                                              mula F=f l/(4x)-f .
                                                                     2     1
                                                               Since the slide device 3 can slide on the guide rope 1, the
                                                              slide device 3 will always press the guide rope 1 in the pro-
                                                              cess that the guide rope 1 is reeled up or down, and the slide
                                                              device 3 will always be at the center point of the connecting
                                                              line between the winch 7 and the hoisting sheave 8 in that
                                                              process, so that the tension on the guide rope can be detected
                                                              in real time. The device is in a balanced state after the entire
                                                              movement process. It is seen from the stress analysis of the
                                                              slide device 3 made on the basis of the force balance princi-
         Figure 18: Sectional view of the slide device shown in figure 17.  ple: the resultant forces of the guide rope 1 and tension ropes

         56     Wire Rope News & Sling Technology   February 2017
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