WO2010030064A1 - Hoist that use friction wheel - Google Patents

Hoist that use friction wheel Download PDF

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Publication number
WO2010030064A1
WO2010030064A1 PCT/KR2009/001348 KR2009001348W WO2010030064A1 WO 2010030064 A1 WO2010030064 A1 WO 2010030064A1 KR 2009001348 W KR2009001348 W KR 2009001348W WO 2010030064 A1 WO2010030064 A1 WO 2010030064A1
Authority
WO
WIPO (PCT)
Prior art keywords
wire
winder
friction
wound
friction wheel
Prior art date
Application number
PCT/KR2009/001348
Other languages
English (en)
French (fr)
Inventor
Duck-Rae Cho
Original Assignee
Kg Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kg Inc. filed Critical Kg Inc.
Publication of WO2010030064A1 publication Critical patent/WO2010030064A1/en

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Classifications

    • 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
    • B66D1/20—Chain, belt, or friction drives, e.g. incorporating sheaves of fixed or variable ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C9/00—Travelling gear incorporated in or fitted to trolleys or cranes
    • B66C9/02—Travelling gear incorporated in or fitted to trolleys or cranes for underhung trolleys or cranes
    • 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
    • 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
    • B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
    • 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
    • B66D1/40—Control devices
    • B66D1/42—Control devices non-automatic
    • B66D1/46—Control devices non-automatic electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0125—Motor operated winches
    • B66D2700/0141—Electrically actuated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0125—Motor operated winches
    • B66D2700/015—Actuated by chain, belt or by friction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0183—Details, e.g. winch drums, cooling, bearings, mounting, base structures, cable guiding or attachment of the cable to the drum
    • B66D2700/0191—Cable guiding during winding or paying out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/03—Mechanisms with latches or braking devices in general for capstans, hoists or similar devices as well as braking devices actuated electrically or by fluid under pressure

Definitions

  • the present invention relates to a hoist using friction wheels, and more particularly to a hoist using friction wheels, which pulls up a cargo having a large load or a cargo having a high head and allows a wire to be uniformly wound on a winder in plural lines, while minimizing the size of the hoist.
  • a hoist In general, a hoist is used to convey goods in a warehouse and a railroad station and to disassemble and assemble machinery in a plant.
  • the hoist is a kind of machinery, which raises or lowers a cargo using a wire, forms a group including a motor, a gear deceleration device, and a wire drum, and is provided with a hook at the tip of a winding wire, thus lifting the cargo.
  • the above-described hoist includes a main frame, on which plural parts are installed, the wire drum installed on the main frame and provided with a plurality of wire grooves on the circumferential surface thereof such that a wire can be wound on the wire drum, a winding sheave and a supporting sheave installed between the wire drum and the hook to guide the wire when the wire is unwound from the wire drum or is wound on the wire drum, a winding motor connected to the wire drum to rotate the wire drum, a decelerator installed between the winding motor and the wire drum to decelerate the rotation of the winding motor, a brake connected to the decelerator to control the decelerator, and a moving part installed on the main frame to transfer wheels installed at the lower portion of the main frame along rails.
  • the surface area of the wire drum should be increased in proportion to the rising and falling distance of the hook block assembly. Therefore, the longer the rising and falling distance of the hook block assembly is, the more increased the length or the diameter of the wire drum is so as to increase the surface area of the wire drum. Accordingly, a hoist including a wire drum having a length and a diameter, which are suitable according to the rising and falling distance of the hook block assembly, needs to be manufactured, and thus various kinds of hoists according to head distances need to be manufactured.
  • the conventional hoist has problems, such as the increase of the total size of the hoist according to the increase of the rising and falling distance of the hook block assembly, and the increase of power consumption.
  • the wire is wound on the wire grooves of the wire drum in a single line.
  • the wire reciprocates from side to side along the wire grooves within the width of the wire drum. Since the wire reciprocates from side to side when the wire is wound on or unwound from the wire drum, the wire may be frequently separated from the wire grooves.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a hoist using friction wheels, which raises and lowers a weight cargo having a large load, while minimizing the size of the hoist.
  • a hoist using friction wheels including a main frame; friction wheels installed on the main frame such that a wire is wound on outer circumferential surfaces of the friction wheels in a single line to pull up a cargo connected to one end of the wire by friction force generated between the wire and the outer circumferential surfaces of the friction wheels when the friction wheels are rotated, the other end of the wire at a drawing side, which is loosened, being separately wounded; a friction wheel driving unit installed at the friction wheels to rotate the friction wheels such that the wire is wound on the outer circumferential surfaces of the friction wheels in the single line to pull up the cargo; a winder installed on the main frame such that the loosened wire at the drawing side is wound on the winder, and when one end of the wire connected to the cargo is pulled upwardly by rotating the friction wheels, the other end of the wire at the drawing is wound on the outer circumferential surface of the winder in plural lines; a winder driving unit installed at the winder to
  • the friction wheels may include a first friction wheel installed on the main frame, and provided with a plurality of rectilinear first wire friction grooves formed on the circumference thereof such that the wire is wound on the circumference of the first friction wheel by half, the wire at the drawing side wound on one of the plurality of first wire friction grooves by half being wound on the winder; and a second friction wheel installed on the main frame in parallel with the first friction wheel, and provided with a plurality of rectilinear second wire friction grooves formed on the circumference thereof such that the wire is wound on the circumference of the second friction wheel by half, the plurality of second wire friction grooves crossing the plurality of first wire friction grooves by a 1/2 pitch; and the wire coming from the drawing side may be wound on the first one of the plurality of first wire friction grooves of the first friction wheel by half, be wound on the first one of the plurality of second wire friction grooves of the second friction wheel by half, and then be sequentially wound on the neighboring ones of the plurality of first and second wire friction grooves by half
  • the friction wheel driving unit may include a friction wheel driving motor connected to the first friction wheel to drive the first friction wheel such that the lower sheave is raised and lowered; a friction wheel decelerator connected to the friction wheel driving motor and the first friction wheel to decelerate the rotating speed of the friction wheel driving motor; a friction wheel brake connected to the friction wheel driving motor to brake the friction wheel driving motor; a driving gear connected to a first shaft being a central shaft of the first friction wheel such that the driving gear is rotated together with the first shaft; an electric gear connected to a second shaft being a central shaft of the second friction wheel such that the rotary force of the driving gear is transmitted to the electric gear; and an idle gear engaged between the driving gear and the electric gear such that the driving gear and the electric gear are rotated in the same direction.
  • the winder driving unit may include a winder driving motor connected to a winder shaft being a central shaft of the winder to rotate the winder shaft such that the wire loosened between the friction wheels and the winder according to the upward pulling of the hook block assembly is wound on the winder; a winder decelerator connected to the winder driving motor and the winder shaft to decelerate the rotating speed of the winder driving motor; a winder brake connected to the winder driving motor to brake the winder driving motor; and an inverter connected to the winder driving motor to control the rotary force of the winder driving motor.
  • a wire guide device may be further installed on the main frame at one side of the winder, be connected to a winder shaft of the winder and is driven by the rotary force of the winder shaft, be reciprocated within the width of the winder such that the wire is uniformly wound on the circumference of the winder when the wire passed through the first friction wheel is wound on the winder, and thus reciprocate the wire wound on the winder within the width of the winder.
  • the wire guide device may include a screw shaft installed on the main frame in parallel with the winder shaft and connected to the winder shaft such that the rotary force of the winder shaft is transmitted to the screw shaft; a first sprocket connected to the winder shaft and rotated together with the winder shaft; a second sprocket connected to the screw shaft and rotated together with the screw shaft; an electric chain connected to the first sprocket and the second sprocket to transmit the rotary force of the first sprocket to the second sprocket; guides connected to the circumference of the screw shaft, and reciprocated in the longitudinal direction of the screw shaft when the screw shaft is rotated; and wire guide rollers respectively fixed to the guides, and reciprocated in the longitudinal direction of the screw shaft to reciprocate the wire wound on the winder within the width of the winder.
  • the hoist of the present invention solves the conventional problem, i.e., the increase of the length or the diameter of the wire drum in proportion to the increase of the head of the hook. That is, the hook is raised and lowered by the friction force of the friction grooves using two friction wheels having a plurality of the friction grooves, and the wire drawn out of the friction wheels are wound on the winder plural times. Therefore, although the head of the hook is increased, it is not necessary to increase the sizes of the friction wheels or the winder in proportion to the increase of the head of the hook. Accordingly, the hoist of the present invention having a relatively small size can raise and lower a cargo having a long head distance. Further, differently from the conventional case that different kinds of hoists are individually manufactured according to heads and loads of the hook, the hoist of the present invention having a small size can carry cargoes having various heads and loads.
  • the tension of the wire at the drawing side of the friction wheels wound on the winder is varied according to the number of the friction grooves of the friction wheels, and the more increased the number of the friction grooves is, the more reduced the tension of the wire at the drawing side of the friction wheels is. Therefore, the driving force of the winder driving motor is highly reduced compared with the driving force of the friction wheel driving motor, and the wire can be wound even with the small power of the winder driving motor. Accordingly, by increasing and decreasing the power applied to the winder driving motor controlled by the inverter, the wire is wound on or unwound from the winder and thus a cargo can be raised or lowered.
  • the hoist of the present invention having a remarkably smaller size than that of the conventional hoist is suitable for lifting a cargo having a large load. That is, the large load applied to the hook is firstly reduced greatly in proportion to the number of lines of the wire wound on the upper sheave and the lower sheave. Thus, the firstly-reduced load is applied to the wire at the winding side of the friction wheels, and is secondarily reduced in proportion to the number of the friction grooves formed on the friction wheels. Accordingly, a greatly small load is applied to the wire at the drawing side of the friction wheels, and the cargo having a large load is raised and lowered by the winder driving motor of a small power.
  • the hoist of the present invention having a small size pulls up the cargo having a large load, and thus is economical in the various aspects, such as manufacture, conveyance, installation, and use of the hoist.
  • the wire at the winding side of the friction wheels and the wire at the drawing side of the friction wheels are wound and drawn at the same positions always. Therefore, while the friction wheels are rotated, the wire is wound on the friction wheels at the same position or is drawn out of the friction wheels at the same position always. Accordingly, since the wire does not roll from side to side during the rotation of the friction wheels, the wire is not separated from the friction wheels or the friction grooves of the friction wheels.
  • the wire guide device reciprocates the wire to be wound within the width of the winder. Accordingly, the wire is not gathered at one side of the winder, but is uniformly wound on the circumference of the winder.
  • FIG. 1 is a schematic front view illustrating a hoist using friction wheels in accordance with the present invention
  • FIG. 2 is a schematic side view of FIG. 1;
  • FIG. 3 is a schematic plan view of FIG. 1;
  • FIG. 4 is a schematic side view illustrating a winding route of a wire
  • FIG. 5 is a schematic front view of FIG. 4.
  • FIG. 6 is a partially selected front view illustrating the friction wheels.
  • FIG. 1 is a schematic front view illustrating a hoist using friction wheels in accordance with the present invention
  • FIG. 2 is a schematic side view of FIG. 1
  • FIG. 3 is a schematic plan view of FIG. 1
  • FIG. 4 is a schematic side view illustrating a winding route of a wire
  • FIG. 5 is a schematic front view of FIG. 4, and
  • FIG. 6 is a partially selected front view illustrating the friction wheels.
  • the hoist using friction wheels in accordance with the present invention include a main frame 1, on which plural parts of the hoist are installed.
  • a main frame 1 on which plural parts of the hoist are installed.
  • two side plates 2 separated from each other are installed such that the plural parts can be installed on the side plates 2, and wheels 3 are installed at lower portions of both sides of the side plates 2 such that the hoist can be transferred along rails.
  • Friction wheels 10 forming the feature of the present invention are installed on the main frame 1.
  • a wire W is wound in a single line on the outer circumferential surfaces of the friction wheels 10, and thus a cargo connected to one end of the wire W is pulled up by friction force generated between the wire W and the outer circumferential surfaces of the friction wheels 10 when the friction wheels 10 are rotated, and the other end of the loosened wire W is separately wounded.
  • the friction wheels 10 will be described more concretely, as follows.
  • the friction wheels 10 include a first friction wheel 20 and a second friction wheel 30.
  • the first friction wheel 20 is installed on the main frame 1, first wire friction grooves 21 are formed on the circumference of the first friction wheel 20 such that the wire W is wound on the circumference of the first friction wheel 20 in a single line of a coil type, and one end of both ends of the wire W wound on the circumference of the first friction wheel 20 is supplied to a winder 50 and is wound on the winder 50.
  • the second friction wheel 30 is installed on the main frame 1 in parallel with the first friction wheel 20.
  • Second wire friction grooves 31 are formed on the circumference of the second friction wheel 30 such that the wire W is wound on the circumference of the second friction wheel 30 in a single line of a coil type.
  • One end of both ends of the wire W wound on the second friction wheel 30 is supplied to the other end of the first friction wheel 20 and is wound on the first friction wheel 20.
  • the other end of both ends of the wire W wound on the second friction wheel 30 is supplied to a lower sheave 80 and is wound on the lower sheave 80.
  • first wire friction grooves 21 are formed on the first friction wheel 20, and six second wire friction grooves 31 are formed on the second friction wheel 30.
  • the first wire friction grooves 21 of the first friction wheel 20 and the second wire friction grooves 31 of the second friction wheel 30 are formed in a rectilinear shape, and do not have a lead.
  • the first wire friction grooves 21 and the second wire friction grooves 31 are not arranged in the same straight line, but cross each other by a 1/2 pitch.
  • the wire W coming from a drawing side is wound on the first one of the first wire friction grooves 21 of the first friction wheel 20 by half, and then is wound on the first one of the second wire friction grooves 31 of the second friction wheel 30 by half. Thereafter, the wire W is again wound on the second one of the first wire friction grooves 21 of the first friction wheel 20 by half, and then is wound on the second one of the second wire friction grooves 31 of the second friction wheel 30 by half.
  • the wire W is wound on the sixth one of the first wire friction grooves 21 of the first friction wheel 20 by half, and then is wound on the sixth one of the second wire friction grooves 31 of the second friction wheel 30 by half.
  • the wire W at a winding side, which has been wound on the sixth one of the second wire friction grooves 31 of the second friction wheel 30 by half, is wound on the lower sheave 80 and an upper sheave 70.
  • the wire W is continuously wound on the first wire friction grooves 21 of the first friction wheel 20 and the second wire friction grooves 31 of the second friction wheel 30, as described above, and is formed in a spiral pattern. Therefore, although the first friction wheel 20 and the second friction wheel 30 are rotated, the position of the wire W at the drawing side and the position of the wire W at the winding side are not changed, and the wire W is drawn and wound at the same positions.
  • first friction wheel 20 and the second friction wheel 30 provide tension to the wire W by winding the wire W on the first wire friction grooves 21 and the second wire friction grooves 31, formed on the circumferences of the first friction wheel 20 and the second friction wheel 30, several times.
  • some degree of tension should be provided to the wire W at the drawing side, and a winder driving unit 60 in the present invention serves to provide tension to the wire W at the drawing side.
  • a friction wheel driving unit 40 is installed at the friction wheels 10.
  • the friction wheel driving unit 40 rotates the friction wheels 10 such that the wire W is wound on the outer circumferential surfaces of the friction wheels 10 in a single line to pull up the cargo.
  • the friction wheel driving unit 40 includes a friction wheel driving motor 41 connected to the first friction wheel 20 to drive the first friction wheel 20 such that the lower sheave 80 is raised and lowered, a friction wheel decelerator 42 connected to the friction wheel driving motor 41 and the first friction wheel 20 to decelerate the rotating speed of the friction wheel driving motor 41, and a friction wheel brake 43 connected to the friction wheel driving motor 41 to brake the friction wheel driving motor 41.
  • a driving gear 44 is connected to a first shaft 22, i.e., a central shaft of the first friction wheel 20, such that the rotation of the driving gear 44 is rotated together with the first shaft 22.
  • An electric gear 45 is connected to a second shaft 32, i.e., a central shaft of the second friction wheel 30, such that the rotary force of the driving gear 44 is transmitted to the electric gear 45.
  • An idle gear 46 is engaged between the driving gear 44 and the electric gear 45 such that the driving gear 44 and the electric gear 45 are rotated in the same direction.
  • the rotary force of the friction wheel driving unit 40 corresponds to a value obtained by subtracting the tension of the wire W at the drawing side, which is wound on the winder 50, from the tension of the wire W at the winding side, which is wound on the second friction wheel 30.
  • the winder 50 is installed at one side of the main frame 1.
  • the winder 50 includes a winding part 52 provided with the circumference, on which the wire W is wound in several lines, a winder shaft 51 installed at the center of the winding part 52 in the longitudinal direction of the winding part 52 to rotate the winding part 52, and side plates 53 installed at both sides of the winding part 52 to prevent the wire W wound on the circumference of the winding part 52 in several lines from being separated from the circumference of the winding part 52.
  • Such a winder 50 is installed on the main frame 1 such that a loosened portion of the wire W is wound on the winder 50, and, when one end of the wire W connected to the cargo is pulled upwardly by rotating the friction wheels 10, the other end of the wire W, which is loosened, is wound on the circumference of the winder 50 in several lines.
  • the winder driving unit 60 is installed at the winder 50.
  • the winder driving unit 60 includes a winder driving motor 61, a winder decelerator 62, a winder brake 63, and an inverter 64.
  • the winder driving motor 61 is connected to the winder shaft 51, i.e., a central shaft of the winder 50, to rotate the winder shaft 51 such that the wire W loosened between the friction wheels 10 and the winder 50 according to the upward pulling of a hook block assembly 90 is wound on the winder 50.
  • the winder decelerator 62 is connected to the winder driving motor 61 and the winder shaft 51 to decelerate the rotating speed of the winder driving motor 61.
  • the winder brake 63 is connected to the winder driving motor 61 to brake the winder driving motor 61.
  • the inverter 64 is connected to the winder driving motor 61 to control the rotary force of the winder driving motor 61.
  • the winder driving unit 60 rotates the winder 50 with a very small force such that the wire W is wound on the winder 50. That is, when the wire W is pulled upwardly by the first friction wheel 20 and the second friction wheel 30, the wire W between the first friction wheel 20 and the winder 50 is loosened. Thus, even though the winder driving unit 60 supplies a small enough force to wind the loosened wire W, the wire W can be wound on the winder 50.
  • the wire W may be wound on the circumference of the winding part 52 of the winder 50 in several lines.
  • the upper sheave 70 is installed at the lower portion of the main frame 1 such that the wire W at the winding side is wound on the upper sheave 70. A portion of the wire W, to which tension is applied by the cargo, passes through the upper sheave 70, and the end of the wire W at the tension side is fixed to the upper sheave 70.
  • the lower sheave 80 is located below the upper sheave 70.
  • the wire W at the tension side passed through the friction wheels 10 passes through the lower sheave 80, and the lower sheave 80 is raised and lowered together with the wire W when the wire W is wound on or unwound from the first friction wheel 20 and the second friction wheel 30.
  • the hook block assembly 90 which is raised and lowered together with the lower sheave 80 to raise and lower the cargo, is connected to the lower portion of the lower sheave 80.
  • a wire guide device 100 is installed on the main frame 1 at one side of the winder 50.
  • the wire guide device 100 is connected to the winder shaft 51 of the winder 50 and is driven by the rotary force of the winder shaft 51, and is reciprocated within the width of the winder 50 such that the wire W is uniformly wound on the circumference of the winder 50 when the wire W passed through the first friction wheel 20 is wound on the winder 50, thus reciprocating the wire W wound on the winder 50 within the width of the winder 50.
  • the wire guide device 100 includes a screw shaft 101 installed on the main frame 1 in parallel with the winder shaft 51 and connected to the winder shaft 51 such that the rotary force of the winder shaft 51 is transmitted to the screw shaft 101, a first sprocket 102 connected to the winder shaft 51 and rotated together with the winder shaft 51, and a second sprocket 103 connected to the screw shaft 101 and rotated together with the screw shaft 101.
  • An electric chain 104 is connected to the first sprocket 102 and the second sprocket 103 to transmit the rotary force of the first sprocket 102 to the second sprocket 103.
  • Guides 105 which are reciprocated in the longitudinal direction of the screw shaft 101 when the screw shaft 101 is rotated, are connected to the circumference of the screw shaft 101.
  • Wire guide rollers 106 which are reciprocated in the longitudinal direction of the screw shaft 101 together with the guides 105 to reciprocate the wire A wound on the winder 50 within the width of the winder 50, are respectively fixed to the guides 105.
  • the wire guide rollers 106 are reciprocated along the screw shaft 101, and thus the wire W is not wound at any side of the winder 50 but is uniformly wound throughout the winding part 52 of the winder 50.
  • a left-handed thread groove (not shown) and a right-handed thread groove (not shown) are formed on the circumference of the screw shaft 101 such that the guides 105 are transferred from one end to the other end of the screw shaft 101 along the left-handed thread groove and then are transferred from the other end to one end of the screw thread 101 along the right-handed thread groove.
  • the left-handed thread groove and the right-handed thread groove are formed on the circumference of the screw shaft 101, and the left-handed thread groove and the right-handed thread groove at one end of the screw shaft 101 are connected by a rectilinear groove (not shown). Therefore, when the screw shaft 101 is rotated, pins (not shown) formed on the inner circumferential surfaces of the guides 105 are transferred from one end to the other end of the screw shaft 101 along the left-handed thread groove.
  • the pins of the guides 105 are transferred to the right-handed thread groove through the rectilinear groove connecting the left-handed thread groove and the right-handed thread groove, and then are transferred from the other end to one end of the screw shaft 101 along the right-handed thread groove.
  • the guides 105 are reciprocated along the axial direction of the screw shaft 101 within the width of the screw shaft 101.
  • the guides 105 may be reciprocated along the screw shaft 101 under the condition that the screw shaft 101 is rotated only in one direction. However, when the guides 105 are transferred from one end to the other end of the screw shaft 101, the screw shaft 101 may be rotated in the opposite direction and thus the guides 105 may be transferred from the other end to one end of the screw shaft 101.
  • a rotating direction conversion gear such as an idle gear (not shown)
  • power transmission gears not shown
  • the guides 105 which were transmitted to the other end of the screw shaft 101 and operated the limit switch, is transferred from the other end to one end of the screw shaft 101 by the screw shaft 101 rotated in the opposite direction. Therefore, the guides 105 installed on the screw shaft 101 can be reciprocated within the width of the screw shaft 101 by the screw shaft 101, which is rotated in a regular direction and its opposite direction.
  • the cargo is hung on a hook 91 of the hook block assembly 90 and is pulled up by driving the friction wheels 10.
  • the driving gear 44 When the driving gear 44 is rotated, the electric gear 45 is rotated through the idle gear 46, and thereby the second shaft 32 of the second friction wheel 30 is rotated. Thus, the first friction wheel 20 and the second friction wheel 30 are rotated in the same direction by the driving of the friction wheel driving motor 41. At this time, the winder driving motor 61 of the winder driving unit 60 is driven.
  • tension applied to the wire W at the winding side of the friction wheels 10 and tension applied to the wire W at the drawing side of the friction wheels 10 according to a load applied to the hook 91 will be calculated, as follows.
  • the friction wheels 10 are devices, which wind the wire S one time or several times and thus provide tension to the wire W due to the friction between the wire W and the friction grooves of the friction wheels 10, and a ratio of the tension of the wire W at the winding side of the friction wheels 10 to the tension of the wire W at the drawing side of the friction wheels 10 is as follows.
  • the ratio of the tension of the wire W at the winding side to the tension of the wire W at the drawing side is as follows.
  • ⁇ efficiency in the half-winding of the wire
  • S n+1 is the tension of the wire at the drawing side.
  • the tension applied to the wire W at the drawing side of the friction wheels 10 is 75kgf. Accordingly, in order to lift a cargo of 200t, the friction wheel driving unit 40 rotates the friction wheels 10 and the winder 50 is rotated with a force of approximately 75kgf such that the wire W at the drawing side is wound on the winder 50.
  • the first sprocket 102 installed on the winder shaft 51 is rotated, and the electric chain 104 and the second sprocket 103 are rotated thereby and thus rotate the screw shaft 101, on which the second sprocket 103 is installed.
  • the guides 105 engaged with the circumference of the screw shaft 101 are reciprocated in the axial direction of the screw shaft 101. Therefore, while the wire W is wound on the winder 50, the wire guide rollers 106 installed on the guides 105 reciprocate the wire W within the width of the winder 50. Thereby, the wire W is uniformly wound on the circumference of the winder 50.
  • the hoist using friction wheels in accordance with the present invention has advantages, as follows.
  • the hoist of the present invention solves the conventional problem, i.e., the increase of the length or the diameter of the wire drum in proportion to the increase of the head of the hook 91. That is, the hook 91 is raised and lowered by the friction force of the friction grooves using two friction wheels 10 having a plurality of the friction grooves, and the wire W drawn out of the friction wheels 10 are wound on the winder 50 plural times. Therefore, although the head of the hook 91 is increased, it is not necessary to increase the sizes of the friction wheels 10 or the winder 50 in proportion to the increase of the head of the hook 91. Accordingly, the hoist of the present invention having a relatively small size can raise and lower a cargo having a long head distance.
  • the hoist of the present invention having a small size can carry cargoes having various heads and loads.
  • the tension of the wire W at the drawing side of the friction wheels 10 wound on the winder 50 is varied according to the number of the friction grooves of the friction wheels 10, and the more increased the number of the friction grooves is, the more reduced the tension of the wire W at the drawing side of the friction wheels 10 is. Therefore, the driving force of the winder driving motor 61 is highly reduced compared with the driving force of the friction wheel driving motor 41, and the wire W can be wound even with the small power of the winder driving motor 61. Accordingly, by increasing and decreasing the power applied to the winder driving motor 61 controlled by the inverter 64, the wire W is wound on or unwound from the winder 50 and thus a cargo can be raised or lowered.
  • the hoist of the present invention having a remarkably smaller size than that of the conventional hoist is suitable for lifting a cargo having a large load. That is, the large load applied to the hook 91 is firstly reduced greatly in proportion to the number of lines of the wire W wound on the upper sheave 70 and the lower sheave 80. Thus, the firstly-reduced load is applied to the wire W at the winding side of the friction wheels 10, and is secondarily reduced in proportion to the number of the friction grooves formed on the friction wheels 10. Accordingly, a greatly small load is applied to the wire W at the drawing side of the friction wheels 10, and the cargo having a large load is raised and lowered by the winder driving motor 61 of a small power.
  • the hoist of the present invention having a small size pulls up the cargo having a large load, and thus is economical in the various aspects, such as manufacture, conveyance, installation, and use of the hoist.
  • the wire W at the winding side of the friction wheels 10 and the wire W at the drawing side of the friction wheels 10 are wound and drawn at the same positions always. Therefore, while the friction wheels 10 are rotated, the wire W is wound on the friction wheels 10 at the same position or is drawn out of the friction wheels 10 at the same position always. Accordingly, since the wire W does not roll from side to side during the rotation of the friction wheels 10, the wire W is not separated from the friction wheels 10 or the friction grooves of the friction wheels 10.
  • the wire guide device 100 reciprocates the wire W to be wound within the width of the winder 50. Accordingly, the wire W is not gathered at one side of the winder 50, but is uniformly wound on the circumference of the winder 50.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Transmission Devices (AREA)
PCT/KR2009/001348 2008-09-12 2009-03-17 Hoist that use friction wheel WO2010030064A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2008-0090321 2008-09-12
KR20080090321A KR100994167B1 (ko) 2008-09-12 2008-09-12 마찰차를 이용한 호이스트

Publications (1)

Publication Number Publication Date
WO2010030064A1 true WO2010030064A1 (en) 2010-03-18

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KR (1) KR100994167B1 (ko)
WO (1) WO2010030064A1 (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8616527B2 (en) 2010-02-26 2013-12-31 Kg Inc. Hoist using friction wheel
CN113501456A (zh) * 2021-07-28 2021-10-15 上海电气风电集团股份有限公司 吊运工装

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101182676B1 (ko) 2011-08-03 2012-09-14 한국고벨주식회사 풍력발전기용 타워리프트 승강구조
CN103991346B (zh) * 2014-05-30 2016-03-23 宁波天益齿轴齿轮有限公司 一种自牵引的牵引器
KR102094676B1 (ko) * 2018-12-21 2020-03-30 조덕래 펜던트식 노내 시스템 비계의 인양 장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06171893A (ja) * 1992-12-07 1994-06-21 Nippon Bisoo Kk 巻上機のワイヤ巻取装置
JP2000219480A (ja) * 1999-01-28 2000-08-08 Taisei Corp 移動式ジャッキ吊治具装置
US6450482B1 (en) * 1999-12-13 2002-09-17 Yale Industrial Products Gmbh Lifting device
US20080191182A1 (en) * 2007-02-08 2008-08-14 Maximilian Arzberger Winch device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06171893A (ja) * 1992-12-07 1994-06-21 Nippon Bisoo Kk 巻上機のワイヤ巻取装置
JP2000219480A (ja) * 1999-01-28 2000-08-08 Taisei Corp 移動式ジャッキ吊治具装置
US6450482B1 (en) * 1999-12-13 2002-09-17 Yale Industrial Products Gmbh Lifting device
US20080191182A1 (en) * 2007-02-08 2008-08-14 Maximilian Arzberger Winch device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8616527B2 (en) 2010-02-26 2013-12-31 Kg Inc. Hoist using friction wheel
CN113501456A (zh) * 2021-07-28 2021-10-15 上海电气风电集团股份有限公司 吊运工装

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KR100994167B1 (ko) 2010-11-15
KR20100031300A (ko) 2010-03-22

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