traction sheave function

All rights reserved. The traction sheave and other eventual diverting pulleys are provided with rope grooves, each rope in the set of hoisting ropes being thus guided separately. in specifications U.S. Pat. This is similar to a see-saw if there is only one person on the see-saw it takes far more energy to get to the top, whereas the balance between two people make it easier. Our NYC Building Violations Removal Services, Freight Elevators vs. FIG. Depending on the identified cause of uneven or major sheave wear, your elevator technician may also suggest other repairs or replacements be made to your elevator system. A powerful clamp clutches the steel governor cable, which activates two safety clamps located beneath the car. The same thing happens in reverse when the elevator goes up. A relatively hard coating can be made thin. 120 0 obj <> endobj 117 0 obj <>stream This can be easily taken into account by adapting the thickness and hardness of the coating, because a thin rope has thin surface wires, so for instance the use of a harder and/or thinner coating will not cause any problems. Basically, the motor only has to overcome friction -- the weight on the other side does most of the work. 1.53(b) of PCT International Application No. In gearless elevators, the motor rotates the sheaves directly. A highly advantageous embodiment of the invention is the use of a coating on the traction sheave. . Vintage Otis gearless traction machine (Credit to Flickr user Tom Magliery, CC BY-NC-SA 2.0 license). This reduces energy consumption because the motor is required to lift no more than the weight of half a car load at any time. Moveable steel jaws wedge themselves against the guiderails until sufficient force is exerted to bring the car to a smooth stop. the disposition of the car, counterweight and hoisting machine can be varied relatively freely. The widespread availability of lower-cost solid state AC drives has allowed infinitely variable speed AC motors to be used universally (for ACVV/AC - VVVF), bringing with it the advantages of the older motor-generator based systems, without the penalties in terms of efficiency and complexity. When a rope with somewhat thicker surface wires (about 0.5 . uuid:3eb220e1-132f-4dc8-b438-685f7a842f4a . by using a so-called double wrap arrangement. At least one of the rope pulleys is provided with a coating bonded to the rope pulley and containing the rope grooves, said coating having a thickness that, at the bottom of the rope groove, is substantially less than half the thickness of the rope running in the rope groove and a hardness less than about 100 shoreA and greater than about 60 shoreA. elevator elevatorvip textbook sheave The coating of the traction sheave and that of a rope pulley may be differently rated so that the coating on the traction sheave is designed to accommodate a larger force difference across the sheave. It is an object of the invention to achieve an elevator in which the traction sheave has an excellent grip on a steel wire rope and in which the traction sheave is durable and of a design that reduces rope wear. This makes it easier to control the elevator, as it compensates for the differing weight of cable between the hoist and the cab. When rope connected to counterweight where cable travels as far as car in opposite direction. Residential Elevators. endstream endobj 181 0 obj <>/Encoding<>>>>> endobj 116 0 obj <> endobj 114 0 obj <> endobj 115 0 obj <> endobj 121 0 obj <> endobj 17 0 obj <> endobj 61 0 obj <> endobj 63 0 obj <>stream If you continue to use this site we will assume that you accept this. The counterweight weighs about the same as the car filled to 40-percent capacity. As with anything, elevator sheaves can only be repaired so many times before the inevitable need for replacement becomes imminent. In practice, a suitable minimum coating thickness is about 1-3 times the surface wire thickness. The older MG-based installations are gradually being replaced in older buildings due to their poor energy efficiency. The sheave grips the hoist ropes, so when you rotate the sheave, the ropes move too. The rails keep the car and counterweight from swaying back and forth, and they also work with the safety system to stop the car in an emergency. The traction version of the machine room less (MRL) elevators are usually implemented with the smaller gearless traction motor that can place the inside the shaft to make the spaces not reduced by the large size motor. Traction lifts are one of the most common systems for large lifts and elevators, including theGartec Goods Lift range but how do traction lifts work? These elevators typically operate at speeds from 38 to 152 meters (125-500 ft) per minute and carry loads of up to 13,600 kilograms (30,000 lb). Rope wraps sheave on counterweight and connects to top of the shaft, rope moves twice as far as cab. The purpose of this balance is to conserve energy. The traction sheaves are provided with undercut or V-shaped rope grooves, which create a strain on the hoisting ropes and therefore also cause more wear of the hoisting ropes than rope grooves of an advantageous semi-circular cross-sectional form as used e.g. A counterweight and an elevator car are suspended on a set of hoisting ropes. The motion of the hoisting ropes produces a motion of a counterweight and elevator car suspended on them. The grooved sheave in this traditional gearless system is quite large, from 0.6 to 1.2 meters (24 ft) in diameter. The ropes that lift the car are also connected to a counterweight (4), which hangs on the other side of the sheave. Safety systems in a traction lift are designed specifically to prevent dead drops and injury through mechanical failure or cables breaking. It is used on mid and low-speed elevators with geared traction motors. [emailprotected]. One of the most central components of traction elevators is their sheaves. 119(a) of Finnish Patent Application 20002701 filed Dec. 8, 2000, the entire contents of each of which are hereby incorporated by reference. Rope wound over sheave twice in high speed elevators for the high rpm gearless traction motor for additional friction. Elevator cars are pulled up by means of rolling steel ropes over a deeply grooved pulley, commonly called a sheave in the industry. 01296 397100 Roped elevators are much more versatile than hydraulic elevators, as well as more efficient. A lubricant especially reduces the internal rope wear resulting from the interaction between rope strands. Gearless traction electric elevator first invented by Otis in 1913, first installed in Woolworth Building in New York City[2]. The other ends of the cables are attached to a counterweight that moves up and down in the hoistway on its own guiderails. Because elevator sheaves are imperative to elevators operation, they must be inspected and maintained regularly. In an elevator provided with hoisting ropes of substantially round cross-section, the direction of deflection of the hoisting ropes can be freely changed by means of a rope pulley. A coating is also advantageously used on the diverting pulleys of the elevator. Diverting pulleys are used for two different purposes: diverting pulleys are used to establish a desired suspension ratio of the elevator car and/or counterweight, and diverting pulleys are used to guide the passage of the ropes. There are various roping systems as shown in the figures and tables below. They can go up to 4,000 feet per minute (20.3m/s) depending on the model & configuration (example: Shanghai World Financial Center). It is used on high speed elevators. 2020 Champion Elevator. Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. The tractive force from the traction sheave to the hoisting ropes, as well as the braking force applied by means of the traction sheave, is transmitted by the agency of the friction between the traction sheave and the ropes. Using up the potential energy in the elevator car (letting it descend to the ground) builds up the potential energy in the weight (the weight rises to the top of the shaft). In the case of the ropes normally used in elevators, which have been designed for a contact with a metallic rope groove and which have a thickness of 8-10 mm, this thickness definition leads to a coating at least about, FIG. The weight of the car is balanced by a counterweight since 1900. An electrically controlled brake between the motor and the reduction unit stops the elevator, holding the car at the desired floor level. The car descends automatically as the oil returns to the cylinder along the same route. The traction sheave driven by the drive machine additionally moves the set of hoisting ropes. It is essential to know when elevator sheave replacement is needed instead of regrooving. The system is just like a see-saw that has an equally heavy kid on each end. This application is a continuation application under 37 C.F.R. FIG. With the right knowledge, team of elevator technicians, and routine maintenance, your elevator can continue safely transporting passengers and freight at its maximum potential. Traction elevators (also known as Electric elevators) are the most common type of elevators. An experienced elevator technician will know whether regrooving or replacement is the best option based on your sheaves condition, age, and prior sheave maintenance. 2010-06-05T10:57:59+05:30 hZr]"CY)/mR%VF-bD ez{kd>@_7f&E[vLd`wOs#]dL4LJ3VZ-QPqj*I$UZ/z.fEqJ1L5")EO#TuiC:{XzW`=?'HXyNOtwPu2Ul}Z__:|G< K.7o_M/Z;^4 ?/*VLKda7-a1Jz&7%'1VzAb |Vc 4Un.w04a'&B-{S6d"&I8%\x']\jg~zrRDK~\hZ%1-U* cyvj\!\zH. The force transmitted by the rope can also be increased by increasing the angle of bite between the traction sheave and the ropes, e.g. 2010-06-05T10:58:41+05:30 Flat steel belts are extremely light due to its carbon fiber core and a high-friction coating, and does not require any oil or lubricant. 30% and save space compared to conventional Thyristor-Leonard control. Thus, on the one hand, due to the total load or average surface pressure imposed on the coating by the rope, the coating should be hard and thin, and on the other hand, the coating should be sufficiently soft and thick to permit the rough surface structure of the rope to sink into the coating to a suitable degree to produce sufficient friction between the rope and the coating and to ensure that the rough surface structure will not pierce the coating. For example, the Gartec Goods Lift range all have an integrated disk brake which prevents the car falling. There are some variants of 2:1 roping, for higher capacity: Types of elevators: Double Deck Dumbwaiter Fireman's Freight Incline Passenger Residential Wheelchair lift, Concept: Capacity Destination dispatch Elevator algorithm Elevator control system Elevator machine room Elevator maintenance Elevator monitoring system Elevator modernization ACOP & UCMP Machine room less elevator Major alterations Rated speed, Elevator systems, controllers and equipments: Elevator emergency automatic rescue device Elevator fixtures Elevator keys Elevator special modes Elevator doors Door cam Door interlocks (Interlock wiring communication system) Door restrictor Elevator Inspection Certificate Emergency stop button Floor designators Gate switch Old Deadman controls Overspeed governor Motor-generator set & Silicon-controlled rectifier (for DC-powered elevators) Insulated-gate bipolar transistor (for AC-VVVF-powered elevators) Selector Tape head Regenerative converter (for AC-VVVF-powered elevators), See also: List of elevator fixtures guide List of elevator and escalator companies Elevator door sill guide (Non-proprietary elevator component door sill guide) Floor numbering (Unlucky floor numbers) Elevator incidents and accidents. Typically, the sheave, the motor and the control system (1) are all housed in a machine room above the elevator shaft. Car-and-jack combinations are described in the table below. . | UK Registered: 02898632 | Gartec Lifts, Midshires Business Park, Unit 6, Smeaton Cl, Aylesbury HP19 8HL, Aritco PublicLift Access Outdoor Lift Option, Gartec 8000 Hydraulic Cabin Stretcher Lift. The present invention relates to an elevator as defined in the preamble of claim 1 and to an elevator traction sheave as defined in the preamble of claim 7. PCT/F101/01072 filed on Dec. 7, 2001, which claims the benefit under 35 U.S.C. 2 presents a partially sectioned view of a rope pulley, Such a rougher area is formed e.g. Any significant or uneven sheave wear may signal other issues your elevator is experiencing and lead to unsafe operation. traction machine elevator ecvv For steel wire ropes less than 10 mm thick, in which the surface wires are of a relatively small thickness, a coating hardness ranging from below 60 shoreA up to about 100 shoreA can be used. If the coating is relatively thin, the force difference arising from the differences between the rope forces acting on different sides of the rope pulley will not produce a large tangential displacement of the surface that would lead to a large extension or compression in the direction of the tractive force when the rope is coming onto the pulley or leaving it. To put it another way, the balance maintains a near constant potential energy level in the system as a whole. As such compression causes lateral spreading of the material, the coating might be damaged by the great tensions produced in it. For ropes having surface wires thinner than in conventional elevator ropes, i.e. With equal loads on each side of the sheave, it only takes a little bit of force to tip the balance one way or the other. 90 shoreA or even harder. The greatest difference across the pulley occurs at the traction sheave, which is due to the usual difference of weight between the counterweight and the elevator car and to the fact that the traction sheave is not a freely rotating pulley but produces, at least during acceleration and braking, a factor either adding to or detracting from the rope forces resulting from the balance difference, depending on the direction of the balance difference and that of the elevator motion. ropes having surface wires only about 0.2 mm thick, a preferable coating hardness is in the range of about 80 . If you opt for a traction lift with a machine room, these can take up a lot of valuable space (but often you can get a machine room less option that means less space is required). These ropes are usually 1/2or 5/8 in diameter. PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY. governor elevator lift otis mechanical elevators wheel patent works gears motor sheave speed lifts governors They also require less space than a hydraulic lift, which requires a large amount of oil stored in a reserve.

The most popular elevator design is the roped elevator. Indirect Acting (suspended type or roped hydraulic drive). NEW HYDE PARK, NY 11040. An elevator driven by means of a traction sheave may comprise other diverting pulleys besides the traction sheave. In the following, the invention will be described in detail with reference to the attached drawings, wherein. Traction lifts are referred to as all sorts of things, including cable lifts, counterweight lifts or rope lifts. This model of elevator can usually reach speeds of 3 m/s, such as MX 20+ versions of Kone MonoSpace. Hoisting cable are generally 3 to 7 in number. carbon fiber or ceramic or metallic fillers, to improve its capacity to withstand internal tensions and/or the wearing or other properties of the coating surface facing the rope. Elevator sheaves that are found to not fit ropes correctly during an inspection may be able to be regrooved to restore proper rope fit. Safety is provided by a governing device that engages the cars brakes, should the elevator begin to fall. It is also an object of the invention to apply said engagement between the traction sheave and the rope to possible diverting pulleys of the elevator. Whatever type of lift you go for, Gartec are always on hand to help. This is advantageous especially in the case of a rope pulley used as a traction sheave. You will not know if your elevator is due for sheave replacement if your elevators sheaves are not regularly inspected. Suspension ropes used on traction type elevators usually attached to the crosshead of the part of car sling and extending up into the machine room looping over the sheave on the motor and then down to the counter weights.

In other words, when the car is 40 percent full (an average amount), the counterweight and the car are perfectly balanced. Steel wire ropes or ropes provided with a load-bearing part twisted from steel wires constitute a tried way of composing a set of hoisting ropes for suspending the elevator car and counterweight. The ropes are attached to the elevator car, and looped around a sheave (3). It is usually linked to the rails in the shaft and can stop the lift car without cables if required.

groove undercut form shape factor maximum pressure The inserts described in these specifications are relatively thick. The cables/ropes are usually a multi-strand steel material for security, meaning that if one of the strands breaks, the cable still holds the lift car up. To reduce the load on the motor, the counterweight is calculated to match the weight of the car and a half-load of passengers. Both the elevator car and the counterweight ride on guide rails (5) along the sides of the elevator shaft. Voltage and frequency are varied to control rotation of the electric motor. In the case of a steel wire rope and a cast-iron or cast-steel traction sheave, a lubricant is almost always used in the rope to reduce rope wear. Heres some simple pros and cons to help you start, but it is important to apply these to your specific set up and see what is the best option for you. Traction lifts are more efficient and reliable than a hydraulic lift as there are far fewer mechanical operations and no fluid systems which can have faults. The properties to be rated are thickness and material properties of the coating. The term roping system can be defined as the arrangement of cables supporting the elevator and which has many types or arrangements as follows. If the elevator cab is at the top of the hoist-way, there is a short length of hoist cable above the car and a long length of compensating cable below the car and vice versa for the counterweight. Contemporary cheaper installations, such as those in residential buildings and low-traffic commercial applications generally used a single or two speed AC hoist machine (abbreviation is AC/(speed number)[1]). The classic idea of a dead drop the cables snapping and the lift car falling is really a myth, but it is possible for cables to snap, which is not possible with hydraulic systems. In other words, for thinner wires a harder and thinner coating is used, and for thicker wires a softer and thicker coating is used. External wear of the rope consists of the wear of surface wires mainly caused by the traction sheave. Elevator Wiki is a FANDOM Lifestyle Community. No. A thin coating is also advantageous in that, as it is squeezed between the rope and the traction sheave, the coating can not be compressed so much that the compression would tend to evolve to the sides of the rope groove. In the scope of the inventive idea, it is obvious that a thin rope increases the average surface pressure imposed on the rope groove if the rope tension remains unchanged.

1 is a diagrammatic representation of the structure of an elevator. Can conserve between 5% and 10% of energy, reduce required power supply by approx. If the compensation system uses cables, there will be an additional sheave in the pit below the elevator, to guide the cables. This type of drive system could be employed in buildings of any height and operated at much higher speeds than steam-powered elevators. Some elevator manufacturers have use this technology such as Otis (Gen2's polyurethane belts), Schindler (Suspension Traction Media for both 3300 and 5500 series), and Kone (UltraRope). The rope is attached at one end to the lift car, and on the other end to acounterweight. At the same time, the coating has to be soft enough to allow the structural roughness of the rope, in other words, the surface wires to sink at least partially into the coating, yet hard enough to ensure that the coating will not substantially escape from under the roughness of the rope. Can conserve approx. As the coating is firmly attached to the sheave by an adhesive bond comprising the entire area resting against the sheave, there will occur between the coating and the sheave no slippage causing wear of these. Traction lifts do tend to be more expensive than hydraulic lifts, though this is due to the extra speed and energy efficiency you get. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AULANKO, ESKO;MUSTALAHTI, JORMA;RANTANEN, PEKKA;AND OTHERS;REEL/FRAME:013990/0139, Free format text: NEW YORK, NY 10018, 57 DENTON AVENUE It is recommended that your sheaves be inspected at least annually. 1972 Otis geared traction elevator at 157-161 George St, Liverpool, Sydney, Australia (video: Jaymie Treadwell). The invention provides the following advantages, among other things: great friction between traction sheave and hoisting rope, the coating reduces abrasive wear of the ropes, which means that less wear allowance is needed in the surface wires of the rope, so the ropes can be made entirely of thin wires of strong material, since the ropes can be made of thin wires, and since thin wires can be made relatively stronger, the hoisting ropes may be correspondingly thinner, smaller rope pulleys can be used, which again allows a space saving and more economical layout solutions, the coating is durable because in a relatively thin coating no major internal expansion occurs, in a thin coating, deformations are small and therefore also the dissipation resulting from deformations and producing heat internally in the coating is low and heat is easily removed from the thin coating, so the thermal strain produced in the coating by the load is small, as the rope is thin and the coating on the rope pulley is thin and hard, the rope pulley rolls lightly against the rope, no wear of the coating occurs at the interface between the metallic part of the traction sheave and the coating material. The electric motor that runs it must be powerful enough to turn this large drive sheave at 50200 revolutions per minute in order to move the elevator at the proper rate. Geared traction machines are driven by AC or DC electric motors. Amotoris attached to asheave(a toothed pulley), with a rope orcablelooped over it. Typically, they also have more safety systems. When a rope pulley has against a steel wire rope a coating containing rope grooves and giving great friction, a practically non-slip contact between rope pulley and rope is achieved. We use cookies to ensure that we give you the best experience on our website. Superior Iron Works & Supply Company, Inc. - , "", ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AULANKO, ESKO;MUSTALAHTI, JORMA;RANTANEN, PEKKA;AND OTHERS;REEL/FRAME:013990/0139, PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY, Elevator provided with a coated hoisting rope, Elevator element for driving or reversing an elevator suspension means in an elevator system, Rolling tire for use on rigid wheel for ski lift, has internal layer made of elastomer material having aspect in order to form wear indicator of external layer when internal layer is appeared below external layer, Traction sheave elevator without counterweight, Wear and friction control of metal rope and sheave interfaces, Elevator tension member and method of production, Test angle apparatus of high-order installation appliance, Protection device of hauling rope mounting groove, Pulley for use with a non-synchronous drive belt, Elevator with function of improving safety performance, Steel wire rope, elevator provided with steel wire rope, lubricant for steel wire rope and use of lubricant for lubricating steel wire rope, Additive-coated sheave, method of manufacturing the same, and methods of reducing sound produced by equipment, Elevator system having a drive sheave with rigid but circumferentially compliant cable grooves, Traction elevator system having cable groove in drive sheave formed by spaced, elastically deflectable metallic ring members, Fiber reinforced plastic impregnated wire rope, Synthetic non-metallic rope for an elevator, Rope drive element for driving synthetic fiber ropes, Gearless cable lift with a dual wind drive disk mechanism, Method of producing a coating or lining for cable pulleys, driving pulleys or the like, Noise abating and traction improving elevator sheave, FRICTIONAL WEAR SUBJECTED MACHINE ELEMENT, Apparatus for splicing ends of a grooved sheave insert member, STRESS DISTRIBUTOR DEVICE FOR AERIAL CABLE GUIDE ROLLER, Reduced pressure vapor deposition method and apparatus, Optical-response artificial exciting film, Ether-based polyurethane elevator sheave liner-polyurethane-urea made from polyether urethane prepolymer chain extended with polyester/diamine blend, Roller with groove for wire saw and its replacement method, Elevator system having drive motor located below the elevator car, High-strength wire with thin elevator rope.
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