Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B15/00—Main component parts of mining-hoist winding devices
  • B66B15/02—Rope or cable carriers
  • B66B15/06—Drums
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/02—Driving gear
  • B66D1/14—Power transmissions between power sources and drums or barrels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/28—Other constructional details
  • B66D1/30—Rope, cable, or chain drums or barrels

Definitions

• the invention relates to a power transmission and bearing arrangement for a drum, the drum being meant for a rope which exerts a tangential force on the circumference of the drum, and the arrangement comprising the mounting of the drum in bearings to a frame structure and a drive arrangement for rotating the drum, the drive arrangement comprising at least one means which is in drive engagement with the drum surface.
• the drum may be meant for a lifting rope hanging from a lifting apparatus, although other similar applications are also possible.
• the conventional way to arrange the power transmission and bearing arrangement of a drum is to provide the drum with a central shaft and bearings and to mount the drum to a frame structure, a drive arrangement being connected to the shaft.
• the speed of the load suspended from the drum and, inversely, the torque in relation to the rate of rotation of the drive motor depend on the diameter of the drum and on the transmission ratio between the gear arranged between the motor and the drum and the cordage associated with the drum. Since economical manufacturing costs are to be aimed at, the drum diameter must be minimized to maintain a low transmission ratio in the gear. A small drum diameter, on the other hand, exposes the rope to wear.
• Another alternative is to use the above described drum comprising the central shaft and mounted in the shaft bearings to the frame structure, only in such a way that the drive wheel of the drive arrangement is arranged to be in drive engagement with the drum surface, thus providing an additional transmission ratio in the power transmission of the drum, in addition to the transmission provide by the gear and the ropes.
• the magnitude of the transmission concerned is approximately equal to the magnitude of the portion by which the drum diameter reduces transmission, the drum diameter thus having no impact on the total transmission ratio.
• the drive wheel of the drum is usually placed on the circumference of the drum rearward from the spooling point of the rope by an amount equal to the pressure angle, thereby ensuring that the gear load and the rope force cancel each other as effectively as possible.
• a problem with the above-mentioned solutions is that the method of arranging the drum bearing subjects the frame structure not only to rope force but also to a bending moment.
• the frame structure when the drive is arranged directly on the drum surface, the frame structure must be made robust because the gear load cannot be completely cancelled and the accuracy of the shaft length must be guaranteed.
• An object of the present invention is to remove the above drawbacks, starting from the type of arrangement described at the beginning. This is achieved with a method of the invention, characterized in that the means in drive engagement is substantially located, when seen in the circumferential direction of the drum surface, in an area on the other side of the drum surface between the means arranged to support and carry the drum surface, or substantially located on the other side of the drum surface at the means arranged to support and carry the drum surface, and that, seen from the end of the drum, the only point where the rope is unwound from the drum is located within the bearing area.
• the invention is based on the idea that rope forces are led directly to the frame structures, thus providing light-weight and simple-structured frame parts.
• the lifting apparatus must naturally be attached to and/or suspended from the area where the rope unwound from the drum.
• a large drum diameter can be selected. This not only extends the service life of the rope but also allows a particular rope length (lifting height) to be obtained by a shorter drum, which reduces the drifting of the rope.
• a rope is said to drift when the spooling point of the rope on the drum shifts in the axial direction of the drum when the rope is wound on or off the drum. This also causes angles in the cordage that wear the rope and the rope grooves, and requires a wider suspension.
• Figure 1 is a schematic view illustrating a power transmission and bearing arrangement of the invention in connection with a drum
• FIG 2 is a perspective view illustrating a frame structure implemented in accordance with the principle illustrated in Figure 1 and provided with bearing and power transmission arrangements;
• Figures 3 to 7 illustrate alternative power transmission and bearing arrangements of the invention in connection with a drum; and
• Figure 8 illustrates an example of the guiding of a rope on a drum.
• a centerless, hollow cylindrical drum 1 of a lifting apparatus is illustrated, a lifting rope 2 being wound on the drum and hanging down from it.
• a drive wheel of a drive arrangement rotating the drum 1 is indicated with reference numeral 3.
• the drum 1 i.e. the drum surface, is mounted in bearings to a frame structure 6 directly on inner and outer surfaces 4, 5 of the drum.
• the bearing arrangement carrying and supporting the drum surface 1 comprises, at both ends of the drum surface 1 , one pair of bearings 7, 8 and 9, 10 arranged above and below the drive wheel 3 in drive engagement with the drum surface 1 , each pair of bearings 7, 8 and 9, 10 comprising a bearing 7, 9 supporting the outer surface 4 of the drum surface 1 and a bearing 8, 10 supporting the inner surface 5 of the drum surface 1.
• the rope 2 is unwound from the drum 1 in an area between the upper and lower bearings, the forces caused by the rotating of the drum 1 and the rope 2 thus being directly led to the frame structure 6, without the frame structure 6 being subjected to a bending moment.
• Figure 2 shows the contact between the above described arrangement and the frame structure 6 in greater detail.
• a drive shaft associated with the drive wheel 3 is indicated with reference numeral 11.
• the drawings only show the drive wheel 3 and its drive shaft because the gear of the drive arrangement and the motor associated with the gear can be selected among several different types of solutions that can be placed in various alternative ways.
• the gear may be a sleeve gear, and the motor may be arranged inside the drum 1 , whereby the lifting apparatus can be made shorter.
• the drive wheel 3 is in drive engagement with the inner surface 5 of the drum surface 1 , but in many cases it may be more advantageous that the drive wheel 3 is in drive engagement with the outer surface 4 of the drum surface, as shown in Figure 3, because then the transmission ratio of the drive wheel 3 with respect to the drum surface 1 can be increased and the toothing needed on the drum surface 1 is easier to provide on the outer surface 4.
• a second drive wheel can be arranged at the other end of the drum.
• the drive wheel 3 can receive some of the bearing load, particularly if a drive wheel is arranged at both ends of the drum 1. If the drum 1 is provided with a drive wheel 3 at both ends, the drive wheels can be interconnected for example by means of a shaft 21 shown in Figure 8.
• the frame structure 6 can be attached to a low trolley (not shown), for example, and the wheels bearing the trolley can be fastened directly to the frame structure 6.
• Figure 4 shows an alternative bearing arrangement for the drum surface 1 , the arrangement comprising bearing strips or bands 12 and 13, each of which comprises at least one bearing strip 12 supporting the outer surface 4 of the drum surface 1 and at least one bearing strip 13 supporting the inner surface 5 of the drum 1.
• the sides of the bearing strips 12 and 13 are fastened to a frame structure not shown in the Figure.
• Figure 5 is a schematic view illustrating a power transmission and bearing arrangement in which the bearing comprises a bearing 14 and 15 supporting the outer surface 4 of the drum surface 1 and arranged at both ends of the drum surface 1 , the bearings being arranged above and below the drive wheel 3 which is in drive engagement, at both ends of the drum surface 1 , with the inner surface 5 of the drum surface 1 , the drive wheel 3 thus forming part of the bearing arrangement of the drum surface 1.
• the bearing arrangement of the drum surface 1 comprises a pair of bearings 16, 17 supporting the outer and inner surfaces 4, 5 of the drum surface 1 at both ends of the drum surface 1 , the pair being arranged above the drive wheel 3 in drive engagement with the drum surface 1 at both ends of the drum surface, and bearings 18 arranged to support the drum surface 1 opposite to the drive wheel 3, the drive wheels 3 forming part of the bearing arrangement of the drum 1 , similarly as in Figure 5.
• Figure 7 shows yet another application where the drive arrangement comprises, at both ends of the drum surface 1 , both a drive wheel 19 in drive engagement with the outer surface 4 of the drum surface 1 and a drive wheel 20 in drive engagement with the inner surface 5 of the drum surface 1 , the drive wheels forming at least part of the drum bearing arrangement.
• the centerless bearing arrangement of the drum 1 and the drive of the drum allow different lifting heights to be obtained by changing the drum diameter, other structural changes being not needed.
• the drum 1 could be manufactured for instance by rolling a long toothed band which is then cut into pieces according to a particular drum diameter.
• a rope groove can also be profiled onto the drum 1 , when needed, at the same time when a blank of the drum band is being rolled.
• the guiding of the rope can also be integrated at the drive wheels 3 interconnected by a shaft 21 provided with a rope guide 22 which is arranged to move by impact of threads made on the shaft 21 and on the rope guide 22.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
• Pulleys (AREA)
• Replacement Of Web Rolls (AREA)
• Unwinding Of Filamentary Materials (AREA)
• Auxiliary Devices For And Details Of Packaging Control (AREA)
• Rolling Contact Bearings (AREA)
• Cage And Drive Apparatuses For Elevators (AREA)
• Support Of The Bearing (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Lift-Guide Devices, And Elevator Ropes And Cables (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8552853

Family Applications (1)

Country Status (11)

Families Citing this family (3)

Citations (3)

Family Cites Families (8)

• 1998
  • 1998-11-05 FI FI982400A patent/FI107798B/fi not_active IP Right Cessation
• 1999
  • 1999-11-03 CN CN99812955A patent/CN1107637C/zh not_active Expired - Fee Related
  • 1999-11-03 WO PCT/FI1999/000918 patent/WO2000027741A1/en not_active Ceased
  • 1999-11-03 DE DE69902060T patent/DE69902060T2/de not_active Expired - Lifetime
  • 1999-11-03 US US09/831,109 patent/US6481693B1/en not_active Expired - Lifetime
  • 1999-11-03 AT AT99971781T patent/ATE220046T1/de not_active IP Right Cessation
  • 1999-11-03 JP JP2000580929A patent/JP4031202B2/ja not_active Expired - Fee Related
  • 1999-11-03 AU AU11636/00A patent/AU753314B2/en not_active Ceased
  • 1999-11-03 CA CA002349257A patent/CA2349257C/en not_active Expired - Fee Related
  • 1999-11-03 ES ES99971781T patent/ES2164628T3/es not_active Expired - Lifetime
  • 1999-11-03 EP EP99971781A patent/EP1163184B1/en not_active Expired - Lifetime

Patent Citations (3)

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