Slewing bearing

About: Slewing bearing is a research topic. Over the lifetime, 1498 publications have been published within this topic receiving 5309 citations.

Electro-hydraulic control system, engineering machinery and electro-hydraulic control method for slewing bearing

Abstract: The invention relates to the technical field of electro-hydraulic control, and discloses an electro-hydraulic control system, engineering machinery and an electro-hydraulic control method for a slewing bearing. The electro-hydraulic control system comprises a hydraulic executing element, a first working oil way (1), a second working oil way (2) and overflow oil ways (3), and further comprises pressurization oil ways (5), wherein the first working oil way communicates with a first oil cavity of the hydraulic executing element, the second working oil way communicates with a second oil cavity of the hydraulic executing element, overflow valves (4) are arranged on the overflow oil ways and are connected to at least one of the first working oil way and the second working oil way, and the pressurization oil ways are connected to the overflow valves and can increase the opening pressure of the overflow valves. According to the electro-hydraulic control system, the opening pressure of the overflow valves can be conveniently and properly increased through the pressurization oil ways in the rotary braking process of the slewing bearing, and therefore the rotary braking angle can be decreased, and the control performance of a whole machine can be effectively improved.

Wyznaczanie reakcji kulek łożyska wieńcowego osadzonego w strukturach roboczych koparki jednonaczyniowej

Abstract: Streszczenie. W artykule zaprezentowano problem dotyczący metodyki modelowania lozysk wiencowych przy cześciowym lub calkowitym uwzglednieniu struktur osadczych maszyny roboczej. Opisano budowe dwoch przykladowych modeli. Obiektem analizy byla koparka gąsienicowa jednoczerpakowa typu F250H. Podano podstawowe parametry analizowanego lozyska. W procedurze modelowania wykorzystano metode elementow skonczonych. Obliczenia potrzebne do wyznaczenia dystrybucji sil obciązających kulki w lozysku byly przeprowadzone za pomocą procedur wykorzystujących system ADINA. Prezentowany sposob obliczania lozysk wykorzystywal rowniez zalezności analityczne warunkujące obciązalnośc strefy styku kulka-bieznia. Wybrane rozklady reakcji kulek zaprezentowano w formie graficznej. Slowa kluczowe: lozyska wiencowe, charakterystyka zastepcza, charakterystyka nośności statycznej, maszyny robocze, metoda elementow skonczonych DETERMINING THE REACTIONS OF BALLS SLEWING BEARING MOUNTED IN WORKING STRUCTURES OF THE SINGLE-BUCKET EXCAVATOR Summary. In the article the problem of modeling methodology slewing bearings by take into account partial or complete structures of housing in the working machine is presented. The structures of two exemplary models are described. The object of the study was singlebucket excavator caterpillar type F250H. Basic parameters of analyzed bearing are presented. The finite element method has been used to the modeling procedure. The calculation which is needed to calculate the force loading of balls slewing bearing has been done using the ADINA program. The way of calculating single-row ball slewing bearing rings which is presented in this paper, used the analytic correlation which determine the permissible load of contact zone (ball-bearing race in slewing bearings) too. The chosen distributions of reactions loading on the balls are presented. The results are shown as a graph.

Mechanism for locking lifting transportation device of blades of wind driven generator

Abstract: The utility model discloses a mechanism for locking a lifting transportation device of blades of a wind driven generator. The mechanism comprises a blade mounting frame, a guide rod, a lifting sliding rack, a rotary underframe and a slewing bearing, wherein the blade mounting frame is hinged to the lifting sliding rack; the two ends of the guide rod are respectively hinged to the blade mounting frame and the rotary underframe; the lifting sliding rack is mounted on the rotary underframe; the rotary underframe is mounted on a transportation sweeping board through the slewing bearing; a hydraulic cylinder is arranged on the lifting sliding rack; a permanent magnet lifter is arranged on the hydraulic rod of the hydraulic cylinder; a hydrocylinder is arranged on the rotary underframe; locking blocks are fixedly mounted on the hydraulic rod of the hydrocylinder; sliding chutes are fixedly mounted on the transportation sweeping board; each sliding chute takes the shape of an arc by using the center of the slewing bearing as the center of a circle; the locking blocks are placed in the sliding chutes. According to the utility model, three locking mechanisms are arranged, therefore, the fact that the lifting transportation device and the transportation sweeping board are reliably locked and connected can be conveniently realized during the transportation process, and the stability and safety of the blades of the wind driven generator during the transportation process are improved.

Roof beam hoist gyration hoist is hung to four hoisting point electromagnetism

Abstract: The utility model relates to a roof beam hoist gyration hoist is hung to four hoisting point electromagnetism, it includes hangs oneself from a beam, on hang oneself from a beam and be equipped with the assembly pulley, on the company of hanging oneself from a beam there is rotation motor, rotation motor even has the revolving axle, the revolving axle even has the driving gear, on hang oneself from a beam the lower part and even have rotary support bearing, the slewing bearing bearing comprises the interior solid of revolution and the outer solid of revolution, the outer solid of revolution is equipped with the external tooth, hang oneself from a beam under the slewing bearing bearing lower part lian you, under hang oneself from a beam and be equipped with the stopper and adjust the seat with having, it is equipped with the action wheel and follows the driving wheel to adjust the seat, the action wheel is equipped with the ring gear, the ring gear is threaded pole even, the threaded rod is equipped with angular wheel A, angular wheel A even has angular wheel B, angular wheel B even has accommodate motor, the tip of threaded rod is hung oneself from a beam under with through the bearing and is connected, there is hook body the lower part of adjusting the seat through the round pin hub connection, the utility model has the advantages of simple structure, running cost hang down, convenient to use is swift, application scope is wide, the gyration is nimble, the equilibrium is good.

Spiral cone stirring ball grinding mill

Abstract: The invention discloses a spiral cone stirring ball grinding mill. The spiral cone stirring ball grinding mill comprises a mill body, a driving device, a slewing bearing, a movable cone device, a fixed cone device and multiple grinding balls, wherein the slewing bearing, the movable cone device, the fixed cone device and the multiple grinding balls are arranged on the mill body. The driving mechanism can drive the movable cone device to rotate around the axis of the fixed cone device through the slewing bearing, and the grinding balls are placed in a cavity defined by the movable cone device and the fixed cone device jointly so as to carry out stirring and powder grinding on materials jointly. By means of the cooperation of the slewing bearing and the grinding balls, materials can be subjected to sufficient powder grinding, the effective work duration of the spiral cone stirring ball grinding mill is prolonged, the maintenance frequency can be reduced, and therefore the working efficiency and the powder grinding effect of the spiral cone stirring ball grinding mill can be greatly improved.