A slewing mechanism which is particularly suitable for use with a car seat for the physically disabled which permits a combined translational and rotational movement of a plate 6 or the like to which, say, a seat assembly 100 may be connected and which includes a primary arm 1 rotatable about a pivot 2 adjacent one end, a secondary arm 4 pivotally. Similar in size to the rk series, kaydons hs series slewing ring bearings have rectangular cross sections that provide approximately twice the load capacity moment ratings up to 9,900 ftlbs in the same envelope. Us3202000a us25145462a us3202000a us 3202000 a us3202000 a us 3202000a us 25145462 a us25145462 a us 25145462a us 3202000 a us3202000 a us 3202000a authority us. Slewing jib cranes gis wallmounted slewing jib cranes are a costefficient alternative to pillarmounted slewing jib cranes or complete crane systems. An elastic jib model for the slewing control of tower cranes. The models of slewing mechanism were built by amsim and the model of buffer oil compensating valve was built by the hcd function of the software. Slew drive radicon drive systems an elecon group company. These slewing jib cranes offer high load capacities up to 10,000 kg for large outreach dimensions. Tr series slewing bearings for radar, cranes, mining. The contact angle of a ball slewing bearing is one of the basic parameters of the bearing design in addition to ball diameter, number of balls and osculation, which determines the raceway profile radius. Together with attachment holes in both rings, they enable an optimized power transmission with a simple and quick connection between adjacent machine components. Threedimensional models of all ht series gearless, internal gear, and external gear slewing rings may be downloaded in formats including autocad, solidworks, and many more. Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing. Methodology for calculating the complete static carrying capacity of twin slewing bearing.
Slewing bearings comprise an inner ring and an outer ring, one of which usually incorporates a gear. A wide variety of slewing mechanism options are available to you, such as metal, plastic, and steel. Slewing rings are sealed on both sides, lubricated with a high quality grease, can be relubricated via lubrication nipples and are particularly easy to fit. The procedure is applied to a particular case and finite element analyses are performed for the friction torque calculation, considering different preloads. Concurrent mechanism and control design for the slewing of flexible space structures. The movement of each step is precise and repeatable. Test the motion of each mechanism with no load and low speed, meanwhile, check that whether the brake is sensitive before lifting load. Slewing drive bearings are usually found in application such as. Download fulltext pdf stiffness analysis of slewing bearings article pdf available in iop conference series materials science and engineering 3931. Hoist condition monitoring system novamaster as overload. View and download jcb 210 series quick start manual online. Use our online catalogs to choose standard or custom bearings for your design application.
Slewing mechanism consists by electric motor and support frame. Support a load a shaft will try to push the bearing in the same direction in which the load moves. Mar 02, 1971 according to the present invention there is provided a crane having a jib adapted for luffing and slewing movements, and incorporating object orienting means comprising two members so connected together as to be rotatable relative to each other about a vertical axis through the medium of power operated means, wherein supporting cable reaches. Products procrane profesional lifting solutions unioque to our. The construction crew uses the tower crane to lift steel, concrete, large tools like acetylene torches and generators, and. A method of computing the catalogue capacity of a slewing bearing, taking into account flexuraltorsional flexibility of bearing rings, flexibility and number of bearing clamping bolts, and the most important parameters of the contact zone of rolling elements with bearing raceways, is presented in the paper. Simulation of the truck crane slewing mechanism hydraulic. The load is dependent on both weight and direction.
Noll, north ridgeville, ohio, assignor to koehring company, milwaukee, wis. Dynamic carrying capacity analysis of doublerow four. Download kaydons new bearing applications guide adobe pdf 08. Pdf the paper presents slewing port cranes with a luffing jib. Children with famous parents often have a hard life they are under great pressure from birth and are expected to be successful. Slewing bearings are an important assembly in working machines, they play the role of rotational mechanisms and connect two structures of a machine. Kaydon bearings slewing ing earings catalog 390 dt series introduction the dt series consists of the eightpoint ball bearing kaydon originally developed to provide maximum load capacity for given envelope and bolt circle diameters.
Thin section bearings, slewing ring bearings, bearing. The paper studies the qy20 truck crane slewing mechanism hydraulic system and expounded its working principle. In combination with a gis electric chain hoist and a trolley manual or electric, a gis vacuumhandling system or another loadhandling device, you get a. Download these pdf files of incredible paper mechanisms. The slewing mechanism adopts a closedtype slewing system to reduce shock and allow for higher stability during initiation and braking of slewing operations. It is forbidden to use any operating mode which can threaten the tower. The standard endless slewing mechanism provides an unrestricted action radius. Carrying capacity is the most important performance index for slewing bearings. An introduction to stepper motors university of arizona. As a result the crane operates much more quickly and costefficiently. Large diameter slewing ring bearings are critical components in many applications.
Engineers can now view and download 3d drawings of kaydon ht series slewing ring bearings on the kaydon corporation bearings division website. The lowheadroom jib provides for particularly long hook paths. Konecranes level luffing multipurpose harbor cranes are designed for heavy duty handling of various cargo for ports worldwide. Hs series slewing ring bearings, for cranes, swivels kaydon. Selection and analysis for hydraulic rotary apparatus of the deck. How tower cranes work tower cranes are a common fixture at any major construction site.
The correctness of the models were validated by insitu measurement. Columnmounted slewing jib crane primus pr vetter krantechnik. When an xr series or dt series bearing doesnt meet your stiffness and capacity requirements, consider the tr series, offering a wide variety of solutions for radar, cranes, mining shovels, and other applications. A bearings rolling internal mechanism greatly reduces the effort and energy it takes to slide or move an object over the surface.
With marine slewing support frame marine crane arm adopts steel box girder. Download fulltext pdf modelling of rollers in calculation of slewing bearing with the use of finite elements article pdf available in mechanism and machine theory 4111. The importance of slewing ring bearing maintenance in lifting. Concurrent mechanism and control design for the slewing of. Chapter xi slewing ring 11b1 chapter xii tower crane maintenance 12b1.
The invention discloses a slewing locking mechanism of a fullcircle slewing crane, and belongs to the field of cranes. These gear units are especially designed for the slewing mechanism. Load sensingludv hydraulic system, electrohydraulic pilot. The slewing mirror telescope smt is a key telescope of ultrafast flash observatory uffo space project to explore the first subminute or subseconds early photons from the gamma ray bursts grbs afterglows. Pdf modelling of rollers in calculation of slewing bearing. If the rotating mechanism is classified in a different drive unit class then it is possible to preselect the correct gear size by converting the required. The slewing unit consists of reduction gear train, slewing bearing, and a driving electric motor. Hs series bearings provide a wide variety of solutions for medium to heavyduty applications. An introduction to stepper motors xinda hu university of arizona college of optical sciences introduction. It provides up to 80% increase in capacity over that of a.
Slewing gears 3 application examples 4 modular gear design 6 output torques 9 operating factor k for slewing gears 11. Working radius is the horizontal distance from the slewing center to the center of gravity of a lifted load. Method of controlling the slewing operation of a slewing. Some of these will be familiar to readers of popup books, but many look like new innovations. Selection procedure for an axial bearing of a slewing platform drive in hydraulic excavators 6 rotary joint, of the fifth class, in the form of an axial bearing. Accelerate or decelerate the slewing speed gradually. Pappus of alexandria 3rd century ad, a greek mathematician is credited for an early version of the endless screw, which would later evolve into the worm drive. Slewing drives in the industrial machinery marketplace. Jul 25, 2016 kinematics slewing drives incorporate the load bearings, rotational torque, and motion control needed, all inside of one tightly manufactured housing. The slewing drive is a modernized take on the worm drive mechanism that dates back many centuries and was widely used during the renaissance era. Kinematics slewing drives incorporate the load bearings, rotational torque, and motion control needed, all inside of one tightly manufactured housing. The key benefit of wallmounted slewing jib cranes is that they do not require any floor space, since they are mounted to stable concrete walls or existing pillars.
Design and implementation of an experimental testrig for. Imo slew drives and slewing rings imo is a leading manufacturer of large diameter antifriction bearings and readytoinstall selfcontained slew drives. Pdf to enable an optimum crane design concerning static and fatigue analyses and to enable. Kaydon bearings manufactures slewing ring bearings and thin section bearings, and provides custom engineering and design assistance for any bearing application. All engineering books pdf download online, notes, materials, exam papers, mcqs for all engineering branch such as mechanical, electronics, electrical, civil, automobile, chemical, computers, mechatronic, telecommunication any all more popular books available here. A hydraulic ram set of the locking mechanism consists of longitudinal hydraulic rams and transverse hydraulic rams, and a wedge block friction pair set consists of a longitudinal wedge block friction pair and a transverse wedge block friction pair. Bearings news for wind energy, military, aerospace, medical. Endless slewing mechanism the standard endless slewing mechanism provides an unrestricted action radius.
The slewing mechanism offers stepless speed regulation within the. Degradation evaluation of slewing bearing using hmm and. Load hoisting assembly consists of the trolley mechanism and the load raising and lowering mechanism. Hydraulic marine crane that hydraulic motor and reciprocating cylinder to form lifting mechanism and slewing motion system. Since 1988, weve been supplying satisfied customers with slewing rings and slew drives that meet their usage needs perfectly made in germany quality.
The unlimited slewing angle offered by the pillarmounted slewing jib crane is a major benefit. View and download terex tc 210 lc service manual online. Free standing jib cranes with 180, 270 and 360slewing options. Slewing mechanism for an excavator grab heinz thumm. As of today we have 76,719,829 ebooks for you to download for free. Cn102718140a slewing locking mechanism of fullcircle. In combination with the palfinger radio control system the load sensing proportional valve enables the crane to be adjusted very slightly. There are 2,875 suppliers who sells slewing mechanism on, mainly located in asia. This capacity of a bearing, called the catalogue capacity, does not take into account the real conditions of bearing work as the conditions of the future application of the bearing are unknown.
Military applications include tank turrets, missile launchers, communication antennae, precision radar antennas, and gun mounts. Modification of the raceway profile of a singlerow ball. Check out this collection of 30 pdf templates for cutandfold paper mechanisms and 3d optical illusions. Damage risk of the raceway edge arise in fourpoint. Slewing bearings are selected on the basis of the characteristics of capacity, which determine the area of the permissible load of the bearing. Determination of the load acting on the axial bearing of a. Load distribution in a four contactpoint slewing bearing, mechanism and. Shenmodeling of system dynamics of a slewing flexible beam. This paper presents a modal approach for the slewing control based on a. Download 3d models of popular slewing ring bearings kaydon. Kaydon tr series threerow roller bearings offer the highest capacity for a given diameter. Damage risk of the raceway edge arise in fourpoint slewing bearing. The slewing drive mechanism of the platform consists of a hydraulic motor 1 as shown in figure 1d, a reducer 2 coupled over an output gear 2.
It also presents the crane assembly, driving mechanisms, loads and load cases, transport by ships and testing of lifting capacity. This work outlines a procedure for the determination of the interferences between balls and raceways in four contact point slewing bearings due to manufacturing errors. Konecranes goal is to ensure that you get the best performance of your cranes throughout the lifetime of the cranes. Use the holes of the rings in the slewing drive to fix bolts for careful hosting and handling. Maximizing the carrying capacity of slewing bearing is one pursuing goal for the bearing designer. Aug 25, 1999 the slewing mechanism has a stator 1 and, mounted thereto by means of a bearing arrangement 4, a rotor 6 that slews about a vertical axis, a hydraulic drive mechanism 8 situated between stator 1 and rotor 6, and at least two rotary transmission leadthroughs 30 for operating the grab. Adobe acrobat reader dc download free pdf viewer for. Because the fault damage mechanism of the slewing bearing is unknown, and the fault patterns are diverse and comprehensive, it is necessary. The importance of large slewing ring bearing maintenance in lifting equipment. A stepper motor is an electric motor that rotates in discrete step increments.
This is why the invention of the bearing is so important. Load distribution in a four contactpoint slewing bearing, mechanism and machine theory. Safety measures drive motor traveling mechanism hydraulic system settings main pump auxiliary pumps control block slewing mechanism travel motor crawler gear pilot control block 10. The top countries of suppliers are china, japan, from which the percentage of slewing mechanism supply is 99%, 1% respectively. A levelluffing crane is a crane mechanism where the hook remains at the same level whilst luffing. Trolley mechanism consists of a sprocketidler arrangment that is driven by a reduced electric. These gear units are especially designed for the slewing mechanism of the stackerreclaimer machines. The bearing rings are supplied without gear teeth or, in order to achieve simple drive solutions, are available with external or internal gear teeth.
Example results of computing the catalogue capacity of slewing bearings. A slewing mechanism which is particularly suitable for use with a car seat for the physically disabled which permits a combined translational and rotational movement of a plate 6 or the like on which, say, a seat assembly 100 may be mounted. Friction torque in four contact point slewing bearings. Select the slewing speed according to the required displacement. The models of slewing mechanism were built by amsim and the model of buffer oil. They are available in a myriad of options for electric motors, reduction ratios, output power, and mounting options in order to suit all types of industrial equipment. Nov 03, 1993 method of controlling the slewing operation of a slewing mechanism and a hydraulic control system for carrying out the same. A method of analyzing the carrying capacity of doublerow fourpoint contact ball slewing bearing by using dynamic carrying capacity. Download free adobe acrobat reader dc software for your windows, mac os and android devices to view, print, and comment on pdf documents. Page 2 service manual excavator tc 210225 lcnlc 6098651 a index safety instructions safety measures drive motor traveling mechanism hydraulic system settings main pump auxiliary pumps control block slewing mechanism travel motor crawler gear pilot control block 10.
Radicon slewing gear units of planetary as well as bevelhelical type conventional are available in various sizes ranging from 1. The slewing mirror telescope of the ultra fast flash. Dynamics of a mobile crane and optimisation of the slewing motion. Complete patent searching database and patent data analytics services. A catalogue capacity of slewing bearings sciencedirect. Slewing bearings differ from typical rolling bearings generalpurpose in many respects. A slewing bearing or slew ing ring is a rotational rollingelement bearing or plain bearing that typically supports a heavy but slowturning or slowoscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the windfacing platform of a.
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