Page 62 - Wire Rope News & Sling Technology






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

continued from previous page
         of which changing codes are applied successively to a plas-
         tic marking strand 1 by means of ink-jet printing. For this
         purpose,  the marking  strand  1 is  unwound  from a drum
         3, drawn through the marking unit 2, and sent by way of
         deflecting pulleys 4 and 5 to a core stranded wire 8, which
         forms the core stranded wire 8 of the rope 10 to be produced.
           The  marking  strand  1  is  guided through  a stranding   Figure 14: Section of a marking strand.
         basket  13 to a stranding  point in  parallel with  the  core   ing production, especially the temperatures for softening the
                                                              plastic, and the stranding speed.
                                                               If, as shown in figure 14, a code for the manufacturer, the
                                                              lot, and the length of rope produced up to that point is print-
                                                              ed on the marking strand, it is possible to link the recorded
                                                              data on the production conditions with the associated posi-
                                                              tion on the rope 10. The same is true if, in addition to the
                                                              manufacturer and lot data, the date/time of the stranding is
                                                              applied to the marking strand 1 (figure 15). In addition, the
                                                              changing codes can also be formed by a color marking, by a
                                                              barcode, or a by 2D code. If, during the use of the rope 10, a
         Figure 11: Schematic diagram of method and device for producing
         a rope.

         stranded wire 8. By way of the stranding basket 9, which
         rotates  around  its  longitudinal  axis,  outer  stranded wires
         6 are wound around the core stranded wire 8 at the strand-
         ing point 9 to form the rope 10, which is pulled away from
         the stranding point 9 by drawing pulleys 11. The marking
         strand 1 is arranged to pass in a straight line through the   Figure 15: Section of second marking strand.
         rope 10 during the stranding process.
           Figure 12 shows a transverse cross section and figure 13   defect is later detected in the rope, it is possible on the basis
         a longitudinal cross section through the rope 10. As can be   of the codes on the marking strand 1 to determine in which
                                                              lot and under what production conditions the rope 10 was
                                                              produced; this is done by correlating the associated location
                                                              on the rope with the data stored in the logging unit 14. It
                                                              is obvious that all of the data pertaining to the production
                                                              conditions can be applied to the marking strand.
                                                               Another rope 10b according to the invention as shown in
                                                              figure 4 differs from that according to figure 3 and 5 in that,
                                                              between a core stranded wire  8b and the outer stranded
                                                              wires 6b, a plastic layer 12 is provided, in which a marking
                                                              strand 1b is embedded. For the production of the rope 10b,
                                                              the marking strand 1b, together with the core stranded wire
                                                              8b, is coated with the plastic by a coating unit and thus em-
         Figure 12: Cross section through a rope.

         derived from the figures, the marking strand 1 is arranged
         in the rope 10 parallel to the core stranded wire 8.
           The marking unit 2 is connected to a device 14 for logging
         the production conditions during the stranding of the rope
         10;  the  unit  records  the  parameters  of  the  stranding  pro-
         cess and, in correlation with them, the associated marking   Figure 16: Section of third marking strand
         applied to the rope. The parameters comprise the length of
         rope 10 already produced, the date/time of stranding, data   bedded in the plastic.
         on the outer stranded wires 6 and the core stranded wires   In  the  exemplary  embodiment  shown  in  figure  16,  RFID
         8 used to produce the rope 10, possibly data on the plastic   chips 15a are provided in a marking strand 1a. These chips
         used in the production of the rope 10, the temperatures dur-  are  advisably  configured  and  embedded  in  the  marking
                                                              strand 1a in such a way that they are able to withstand the
                                                              mechanical loads to which the wire rope is subjected. For this
                                                              purpose, they can be made so that they are flexible and can be
                                                              embedded in a layer resistant to mechanical loads. The mark-
                                                              ing unit 2a is provided for this purpose in such a way that it
                                                              can store some or all of the data on the production conditions
                                                              on each RFID chip 15a. It is advantageous for the data on the
                                                              RFID chips 15a to be read out without the need to separate
         Figure 13: Schematic longitudinal cross section of the rope.  the marking strand from its associated rope.

         62     Wire Rope News & Sling Technology   June 2018
   57   58   59   60   61   62   63   64   65   66   67