Iron Shielded Deep Groove Ball Bearing is one type of ball bearings. shields are non-contact metallic (carbon or stainless steel) devices which allow high-speed operation but offer limited protection against the ingress of moisture and dirt. but do not protect against liquids. They add no friction during operation and therefore do not generate heat build-up. Iron shielded deep groove ball bearings often have steel shields installed on one or both sides and are pre-lubricated with grease. While many different retainers are available, pressed steel cages are most commonly used.
Bearing dust shields have been available almost as long as Ball Bearing itself. Shields are needed to stop the grease lubrication used in these bearings from leaking out. This is particularly important in applications where grease leakage may contaminate the product. The main impetus towards shielded bearings comes from the growing use of [sealed-for-life" bearings in items such as white goods, cars and power tools. Shields are fitted in the outer ring and do not make contact with the inner ring, but form a narrow gap with it.
Depending on the bearing design, series and size, MANU supplies shields in different designs.
With one shield (-Z) on one side or two shields (-2Z/ZZ) on both sides; Due to the manufacturing processes used, open bearings can have turned recesses in the outer ring for shields.
Celarance:
Internal clearance provides the bearing room for expansion between the bearing races and will add a small amount of play between the two rings. Large clearance C3/C4 usually used in harsh environment. with good anti-seize performance used in particularly harsh environment.
Tolerances
The standard version of our single-row deep groove ball bearings has the tolerance class P0
(designs with tighter tolerances available upon request)
To be the first class, to do the best quality, to make users satisfied, to ensure customers relieved, are our enterprise purposes. Welcome bearing dealers` and Conveyor Idler manufacturers contact from all over the world, and become our partner.
Iron Shielded Deep Groove Ball Bearing Iron Seals Ball Bearing,Iron Sealed Ball Bearing,Iron Shielded Bearing,Steel Shielded Bearing Shandong Xinkaite Bearing Co., Ltd. , https://www.idlerbearing.nl
Tools / materials DC12V2A Power / DC12V10A switching power / POE supply module <br> <br> Method /
Point to point power supply:
Point-to-point power supply refers to direct 220V AC power from the monitoring room, and a separate DC12V power supply is connected next to the camera. Then, it is connected to the surveillance camera and the bracket is installed.
Advantages: 220V AC voltage loss during transmission, strong anti-interference ability.
Disadvantages: Each point must be installed a power supply, construction is more troublesome.
Centralized power supply:
Centralized power supply: Connect a 12V centralized power supply to a 220V power supply, and then connect the 2*1.0 red and black power cables to the camera. The 12V power supply distance must not exceed 100 meters. After connecting a single power cable connector, connect a single power cable connector and surveillance camera power connector. The centralized power supply mode refers to centralized power supply to the front-end load using a 12V switching power supply in the splicing screen monitoring room or an intermediate point.
Advantages: construction is more convenient and easy to maintain.
Disadvantages: DC low-voltage power supply transmission distance is too high, the voltage loss is high, and the anti-interference ability during transmission is poor. 
POE power supply:
POE power supply refers to the technology that provides DC power to other devices without any changes to the existing Ethernet Cat.5 cabling infrastructure. This method is mainly applied to high-definition network digital monitoring system. Advantages: Cost reduction, flexible deployment, and maximum single port power up to 30W.
Disadvantages: High quality requirements on the network cable, limited transmission distance. 
Need to pay attention to the problem:
When using infrared cameras, centralized power supply is not recommended. Because the current is large when the infrared is turned on, it is difficult to ensure the infrared effect of all cameras by the centralized power supply mode.
Point-to-point power supply, nearest access to electricity, can save lines, is a big savings, but after-sales maintenance, extremely difficult to maintain; this is positive, centralized power supply has a benefit, after the maintenance is simple; not easy problems, but not The more you cross the wire, if you just leave this one, then you use point-to-point power, which is long-term use of centralized power.
If the outlet is more than one, the power can be taken nearest to each other. If there is not much, it can be concentrated; if it is indoors, the sheathed power line can be used well.
With the choice of LCD splicing screen to do more and more with video surveillance. In addition to considering the LCD screen in the hot summer heat problem. We also need to consider the issue of power supply in order to achieve the best display of LCD screens. 
LCD splicing monitoring project inside the power supply solution how to choose
With the market demand and practical application requirements of LCD splicing screens becoming higher and higher, in the LCD splicing monitoring project, the power supply mode of the camera needs to be taken into consideration. What kind of power supply mode can achieve the best monitoring effect and save the maximum amount of liquid crystals. Splicing project costs? First of all, Emperor Aidi Electronic explains several ways of powering the camera in the video surveillance project.