Slewing Ring Bearings

In the past 40 years, new mechanical parts have gradually emerged around the world. It consists of inner and outer rings, rolling elements, etc. The slewing bearings produced in my country are mainly introduced by the Tianjin Construction Machinery Research Institute designated by the Ministry of Machinery Industry in the early 1980s. Design and manufacturing technology of the former Rothe Erde company in the Federal Republic of Germany. On December 20, 1984, the standard of the Ministry of Machinery Industry of the People's Republic of China was issued: JB/2300-84 "Type, Basic Parameters and Technical Requirements of Slewing Bearings". The factory was responsible for drafting, and later the state issued the construction machinery standard in 1991: JB36.1-36.3-91. In 1999 and 2011, new machinery industry standards JB/2300-1999 and JB/2300-2011 were successively released.

The slewing bearing is a large bearing that can bear comprehensive loads, and can bear large axial and radial loads and overturning moments at the same time. Slewing ring bearings generally have mounting holes, internal or external gears, lubricating oil holes and sealing devices, so that the design of the main engine can be compact, easy to guide, and easy to maintain. The slewing ring bearings include four-point contact ball bearings with no gears, external gears and internal gears, double-row angular contact ball bearings, crossed cylindrical roller bearings, crossed tapered roller bearings and three-row cylindrical roller composite bearings. Series, in which the four-point contact ball bearing has a high static load capacity, the crossed cylindrical roller has a high dynamic load capacity, and the pre-interference of the crossed tapered roller bearing can make the bearing have greater support rigidity and rotational accuracy. The three-row cylindrical roller combination bearing leads to the height of the bearing due to the improvement of the bearing capacity, and various forces are borne by different raceways. Therefore, under the same force, the bearing diameter can be greatly reduced, so the main engine is more compact. A high load capacity slewing ring bearing. Slewing ring bearings are widely used in large-scale slewing devices such as hoisting machinery, mining machinery, construction machinery, port machinery, marine machinery and equipment, as well as high-precision radar machinery and missile launchers. At the same time, it can also design, develop and produce various special structure slewing ring bearings according to the specific requirements of users.

Basic structure

Slewing drive is usually composed of worm, slewing bearing, housing, motor and other components. Because the core component adopts slewing bearing, it can bear axial force, radial force and tipping moment at the same time. There are many forms, but the structure and composition are basically the same.

From left and right are (upper part):

1. Outer ring (with or without teeth) 2. Sealing belt 3. Rolling body (ball or roller) 4. Oil filler

From left and right are (bottom part):

1. Blocking 2. Blocking pin 3. Inner ring (with or without teeth) 4. Spacer block or cage 5. Mounting hole (wire hole or smooth hole)

Application

The slewing bearing is widely used in the real industry and is called "the joint of the machine". Its main applications are widely used in: truck cranes, railway cranes, port cranes, marine cranes, metallurgical cranes, container cranes, excavators , filling machine, and CT machine standing wave therapy instrument, navigation instrument, radar antenna base, missile launcher, tank, robot and revolving restaurant and so on.

Construction machinery

Slewing bearings are widely used, and construction machinery is the first and most widely used place for slewing bearings, such as earth-moving machinery, excavators, disintegrators, stackers and reclaimers, graders, road rollers, dynamic compactors, rock drilling machinery, roadheaders, etc. Others are:

Concrete machinery: concrete pump truck, concrete mixing and placing boom integrated machine, belt placing machine

Feeding machinery: disc feeder, sand mixer

Hoisting Machinery: Wheel Cranes, Crawler Cranes, Portal Cranes, Tower Cranes, Fork Cranes, Supplied Cranes, Gantry Cranes , rotary drilling rig, reverse circulation rotary drilling rig, positive circulation rotary drilling rig, long helical engineering drilling rig, diving engineering drilling rig, static pile driver, pile driver

Engineering Vessel: Dredger

Special vehicles: bridge inspection vehicles, fire trucks, window cleaning machines, flat beam transport vehicles, aerial work vehicles, self-propelled aerial work platforms

Light Industry Machinery: Beverage Machinery, Blow Molding Machine, Packaging Machinery, Filling Machine, Rotary Bottle Unscrambler, Injection Molding Machine

Marine crane

Various device platforms

In addition to various construction machinery, the application range of slewing bearings has gradually expanded, and equipment platforms such as port equipment, metallurgical equipment, drilling platforms, etc. Have begun to use slewing bearings instead of original bearings on a large scale.

Port equipment: port cranes, reach stackers

New energy equipment: wind power generation equipment, solar power generation equipment

Metallurgical equipment: metallurgical crane, ladle turntable, steel grabber, mud gun, oxygen blowing device

Amusement equipment: Ferris wheel, etc.

Airport Equipment: Airport Refueler

Military equipment: radar, tanks, etc.

Robots: palletizing robots, welding robots, manipulators

Medical Equipment: Gamma Knife

Environmental protection equipment: mud scraper

Parking Equipment: Tower Garage

Drilling platform equipment, kitchen equipment, CNC equipment (wire cutting machine, quenching machine tool), brick machine

Common materials

Materials for rings and rolling elements

In general, the rolling elements of the slewing ring are made of carbon-chromium bearing steel which is hardened as a whole. The grade is made of gcr15 or gcr15simn steel; the slewing bearing ring is made of surface hardened steel. When the user has no special requirements, it is generally made of 50Mn steel, but sometimes in order to meet the needs of the host in some special applications The specific conditions of use select other grades of surface hardened steel, such as 42crmo, 5crmnmo and so on.

Material for cage

The cage for slewing bearing has integral, segmented, isolated block and other structural forms. The integral and segmented cages are made of 20-gauge steel or ZL102 cast aluminum alloy. The spacer block type is made of polyamide 1010 resin, ZL102 cast aluminum alloy, etc. In recent years, with the continuous development of the material industry, nylon GRPA66.25 has also been popularized and applied in the design of segmented cages.

Material for sealing ring

The material of the slewing ring seal is made of oil-resistant nitrile rubber.

The codes of the ferrule material and the supply status of the blank are as specified in the table. In the table, "T" means that the blank of the ring is supplied in a quenched and tempered state, and "Z" means that the blank of the ring is supplied in a normalized state.

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