Slewing Bearing

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Slewing Bearings, or turntable bearings, are ball or roller style bearings composed of two concentric rings either of which may include a gear. This type of bearing enhances load support and power transmission in all directions, and is typically employed to support heavy loads for slow applications and large equipment such as earth excavators and construction cranes. The unique power and versatility of slewing ring bearings has made them increasingly valuable in a wide array of industries, including construction, industrial, robotics, machine tooling, and medical applications.






To "slew" means to turn without change of place. A slewing bearing or slew[ing] ring is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads.






Slewing rings are known worldwide as premium products in the field of rolling bearing technology. These machine elements have proven themselves many times over; they have high load-carrying capacity, a versatile range of applications and are highly cost-effective. Due to their design, a single bearing can reliably support radial, axial and tilting moment loads. It is therefore possible in many cases to replace bearing arrangements comprising a combination of radial and axial bearings by a single bearing. This reduces - in some cases considerably - the costs and work required in the design of the adjacent construction and the fitting of bearings.






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 bearing rings are supplied without gear teeth or, in order to achieve simple drive solutions, are available with external or internal gear teeth.






How do you test a slewing bearing?


One of the most basic indicators of slewing ring bearing problems is the condition of the lubricant. If metal particles or flakes are apparent, some form of wear is taking place. Grinding, popping, or clicking noises from the bearing typically mean there is inadequate lubrication and/or excessive wear in the raceway.






Slewing Ring Bearings From Emerson Bearing


For more than 50 years, Emerson Bearing has been the go-to provider of top-quality roller and ball bearings for customers around the world. Our selection includes everything from miniature precision bearings to five-foot mill bearings in a variety of styles and materials to suit the needs of your applications. We are dedicated to providing our customers with the right bearings at competitive prices.






Slewing Ring Bearing Applications


Slewing ring bearings are often relied upon to support loads in very large, heavy-duty equipment. Their exceptional combination of heavy load support and mobility enhancement makes them useful in a variety of industries and applications. They can be used as Slewing Bearing for New Energy, Slewing Bearing for Engineering Machinery, Slewing Bearing for Automation Equipment, Slewing Bearing for Amusement Machinery, Slewing Bearing for Agricultural Machinery, Slewing Bearing for Logistics Warehousing, Slewing Bearing for Environmental Protection Machinery, Slewing Bearing for Mining Machinery, Slewing Bearing for Forest Machinery, etc.

Axial Flow Fan

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Axial vs Centrifugal Fans


There are two primary varieties of fan, axial fans and centrifugal fans. Pelonis Technologies, Inc. (PTI), a global leader in fan technology for more than 25 years, manufactures both axial and centrifugal fans. The design and function of a centrifugal fan is very different from those of an axial fan. Their differences make them each suited for different applications and customers are sometimes unclear as to which fan type will best suit their needs.






Axial Fans


Axial Flow Fans date back to the horizontally configured windmills of Europe in the Middle Ages. The first electrically powered fans, introduced in the 1880s, were axial fans. Axial fans are named for the direction of the airflow they create. Blades rotating around an axis draw air in parallel to that axis and force air out in the same direction. Axial fans create airflow with a high flow rate, meaning they create a large volume of airflow. However, the airflows they create are of low pressure. They require a low power input for operation.






Centrifugal Fans


The centrifugal fan was invented in 1832 by military engineer Lieutenant General Alexander Sablukov of the Russian Empire's Imperial Russian Army. Often called blowers, centrifugal fans vary differently from axial fans. The pressure of an incoming airstream is increased by a fan wheel, a series of blades mounted on a circular hub. Centrifugal fans move air radially - the direction of the outward flowing air is changed, usually by 90°, from the direction of the incoming air.






The airflow created by centrifugal fans is directed through a system of ducts or tubes. This helps create a higher pressure airflow than axial fans. Despite a lower flow rate, centrifugal fans create a steadier flow of air than axial fans. Centrifugal fans also require a higher power input.






Application of Axial Fan


Because of the low-pressure high-volume airflows they create, axial fans are best suited for general purpose applications like Marine Fans. For example, they excel at moving air from one place to another, cooling confined spaces such as computers, and cooling larger spaces such as work spaces.






A standard AC model is energy efficient, using no more than 100 watts when on high speed. AC fans can be connected directly to a DC power source, such as solar panels or batteries. Since the end goal in units like vending machines is an even flow of cooling power, an AC fan is the fairly obvious choice.






Application of Centrifugal Fan


Because of the high pressure they create, centrifugal fans are ideal for high pressure applications such as drying and air conditioning systems. As all of their moving parts are enclosed and they also have particulate reduction properties that makes them ideal for use in air pollution and filtration systems. Centrifugal fans also offer distinct benefits.
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