Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B7/00—Other common features of elevators
  • B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
  • B66B7/1207—Checking means
  • B66B7/1215—Checking means specially adapted for ropes or cables
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B19/00—Mining-hoist operation
  • B66B19/02—Installing or exchanging ropes or cables

Definitions

• the present invention relates to a method as defined in the preamble of claim 1 for ensuring the internal tightness of an elevator hoisting rope and to an elevator as defined in claim 9.
• the object of the present invention is to overcome the above-mentioned drawbacks and to provide a dependable, reliable, easy-to-implement and fast method for ensuring and measuring a sufficient tightness of an eleva- tor hoisting rope, and thus to reduce the risk the hoisting ropes being damaged in connection with elevator operation, thereby also improving the operational dependability, reliability and safety of the elevator.
• a further object of the invention is to achieve an elevator with re-tightened hoisting ropes.
• the method of the invention for ensuring and measuring the internal tightness of an elevator hoisting rope is characterized by what is disclosed in the characterization part of claim 1.
• the elevator of the invention is characterized by what is disclosed in the characterization part of claim 9.
• Other embodiments of the invention are characterized by what is disclosed in the other claims .
• a primary area of application of the invention is elevators designed for freight/passenger transportation.
• Another primary area of application is in elevators having relatively thin twisted hoisting ropes provided with a steel core.
• Fig. 1 presents a simplified and oblique top view of an elevator solution applying the invention.
• Fig. 2 presents a cross-sectional view of a hoisting rope applicable in the solution of the invention
• Fig. 3 presents a cross-sectional view of the hoisting rope in Fig. 2 in a situation where the rope has been partly untwisted
• Fig. 4 presents the hoisting rope in a simplified side view in a situation where the rope has been partly untwisted
• Fig. 1 presents a simplified and oblique top view of an elevator solution applying the invention.
• Fig. 2 presents a cross-sectional view of a hoisting rope applicable in the solution of the invention
• Fig. 3 presents a cross-sectional view of the hoisting rope in Fig. 2 in a situation where the rope has been partly untwisted
• Fig. 4 presents the hoisting rope in a simplified side view in a situation where the rope has been partly untwisted
• Fig. 5 illustrates an oblique side view of a situation where the tightness of the hoisting rope is being measured.
• Fig. 1 presents a typical elevator solution in which the method of the invention for ensuring and measuring the internal tightness of an elevator hoisting rope can be used.
• the elevator is preferably an elevator without machine room and having a hoisting machine 3 connected via a traction sheave 5 to a set of hoisting ropes, which consists of hoisting ropes 9 running parallel to each other and supporting a counterweight 2 and an elevator car 1 moving on their respective tracks, i.e. along guide rails 8 and 7.
• the parallel hoisting ropes 9 are anchored to a fixed starting point 10, from which the ropes go downwards towards a diverting pulley 6 mounted in conjunction with the elevator car 1, at a position substantially below the elevator car.
• the hoist- ing ropes From the diverting pulley 6, the hoist- ing ropes go to a second corresponding diverting pulley placed at the other lower edge of the elevator car and, having passed around this second diverting pulley, they go upwards to the traction sheave 5 of the elevator machine 3 disposed in the in the upper part of the elevator shaft. Having passed around the traction sheave 5 by its top side, the hoisting ropes go again down to diverting pulleys 6 mounted in conjunction with the counterweight 2, passing around these pulleys by their lower side and then returning again up to their fixed end point 11.
• the functions of the elevator are controlled by a control system 4.
• Fig. 2 and 3 present cross-sectional views of a hoisting rope applicable in the solution of the invention.
• the hoisting rope 9 is in a correct state of tightness, with all its strands tightly twisted according to their braiding around the core strand.
• Fig. 3 again illustrates a situation where the braiding of the rope has become loose. The figure shows the rope with an exaggerated loosening to provide a sufficient visual impression.
• the six strands 12 forming the sheath of the rope 9, each of which in this case consists of nineteen wires 13 twisted around each other have come loose of the core strand 14 forming the core of the rope.
• Fig. 4 presents a hoisting rope 9 thus loosened, in side view and simplified for visual clarity.
• the core strand 14 is straight, but a loosened strand 12 has grown in length in the longitudinal direction 15 of the rope because, due to a diminished contact and interlock between strands, there has also appeared between the twists of the strand 12 a clearance 15a, which has an effect in the longitudinal direction 16 of the rope.
• the method of the invention ensures a structural tightness and tension of the hoisting ropes 9 sufficient to keep the rope together, to ensure that after start-up of the elevator there will appear no accumu- lated looseness that would make the rope susceptible to damage. Sufficient tightness of the rope is ensured at installation time. At the end of the installation operation, when the installation has been finished in other respects, the mutual tightness of all the paral- lei hoisting ropes 9 is first ensured by equalizing the spring lengths if necessary and performing a sufficient number of equalizing runs if necessary.
• the second ends of the rope are released from their an- chorage and all the hoisting ropes 9 are tightened by twisting them from the free end and over a free straight portion as long as possible in the same direction with the pitch of the rope helix by a number of turns required to achieve a sufficient tightness.
• This tightening action is continued until the tighten- ing effect is propagated after the straight portion even over the diverting and other pulleys .
• the required number of turns depends at least on the rope length.
• twist pitch thus refers to the number of rope twists, i.e. twist pitches over the entire hoisting length of the rope.
• a hoisting rope is achieved in which the outer strands 12 forming the rope sheath have a greater tension than the core strand 14 inside the rope.
• ropes thinner than 4 mm e.g. ropes with a diameter of about 3 mm or even less.
• thinner ropes it is possible to use ropes having a number of twists larger than the numbers mentioned above.
• Fig. 5 visualizes a measuring method according to the inven- tion, which is suited to this purpose and guarantees a sufficient tightness.
• the figure is depicted in a sim- plified form and is not in scale.
• the measuring method of the invention the torque produced by the tightening tension of the rope 9 is measured.
• the measurement is carried out after the hoisting ropes 9 have been first tightened after installation to a substantially equal tightness and after a few equalizing runs have been performed to allow the tension differences between different parts of the rope to be equalized.
• the measurement can be made from different points in the longitudinal direction of the ropes. Based on the measurement results, the rope is tightened further if necessary to achieve a sufficient tightness .
• a constant distance must be al- lowed for the rope 9 as a straight free length 21 of the rope.
• This distance is suitably e.g. 3 m.
• the measuring length 22 chosen to be used here is 0.5 m or 500 mm.
• the measuring length 22 is the distance from the torsion moment measuring clamp 18 to a holding clamp 17, by means of which the rope 9 is locked so that it cannot be twisted in the portion 23 above the holding clamp 17.
• a rope separator 20 must be placed between the rope to be measured and the adjacent ropes to provide a measuring space of required size. Parallel thin ropes lie very close to each other, in which case the horizontal distance between the ropes has to be increased to permit the jaws of the torsion moment measuring clamp 18 to be placed around the rope to be measured.
• the measurement is carried out by holding the rope in place by means of the holding clamp 17 and turning the torsion moment measuring clamp 18 provided with a scales 19 through a constant twist angle • in the direction of the rope helix, i.e. in the twisting direction of the braiding.
• the scales 19 of the torsion moment measuring clamp 18 will show the force F used to turn the clamp, this force being always the same for identical ropes at the same level of tightness.
• the scales structure 19 is depicted in a diagrammatic form.

Landscapes

• Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
• Maintenance And Inspection Apparatuses For Elevators (AREA)
• Control Of Electric Motors In General (AREA)

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• 2002
  • 2002-11-15 FI FI20022040A patent/FI112642B/fi not_active IP Right Cessation
• 2003
  • 2003-10-13 AU AU2003268986A patent/AU2003268986A1/en not_active Abandoned
  • 2003-10-13 ES ES03750762T patent/ES2285167T3/es not_active Expired - Lifetime
  • 2003-10-13 JP JP2004552749A patent/JP2006506299A/ja active Pending
  • 2003-10-13 DE DE60314768T patent/DE60314768T2/de not_active Expired - Lifetime
  • 2003-10-13 CN CNB2003801033178A patent/CN100386252C/zh not_active Expired - Fee Related
  • 2003-10-13 WO PCT/FI2003/000756 patent/WO2004046008A1/en active IP Right Grant
  • 2003-10-13 AT AT03750762T patent/ATE366223T1/de not_active IP Right Cessation
  • 2003-10-13 EP EP03750762A patent/EP1560779B1/de not_active Expired - Lifetime
• 2006
  • 2006-06-02 HK HK06106388A patent/HK1086538A1/xx not_active IP Right Cessation

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