Many types of screening devices can be used for making particle size separation, including 振动屏幕 和 回转圆筒. 的 right one for your application depends on your feed material 和 production goals.
Here are eight questions to ask when sizing a screening device for your application.
1. 每小时多少吨?
的 first question you want to ask is how much material will be processed over a certain a period of time, 或者说每小时多少吨.
的 screening equipment manufacturer will then ask you for the typical number of hours you operate in a day. Capacity factors for sizing a screening unit are based on the criteria listed below on a per hour basis.
2. 粒径分布是怎样的?
的 particle size distribution is a listing of the size of the material to be separated. You should provide the screening equipment manufacturer with a distribution of several particle sizes above 和 below the cut points required for your application.
对于你需要的切割点, it’s beneficial to provide the amount or percent of oversize of that size separation. It is also beneficial to provide the amount of half size of your required cut.
Providing more than one sieve size of the oversize 和 half size allows the supplier to see a more complete picture of your application, including the maximum particle size in the feed stream, so they can offer the right machine for your requirements.
You can provide the sieve openings in either metric or imperial. 的 supplier just needs to know which measurement system you’re using.
3. What is the bulk density of the material to be separated?
所有材料的密度都不同. 再一次。, it doesn’t matter if you provide the weight of the solids in metric or imperial values (such as tons per meter cubed or pounds per cubic foot), this is a factor that’s critical for the manufacturer to know.
4. What is the moisture content in the feed material to be screened?
的 moisture content of the feed material is an important detail to provide. 无论含水率是否为5%, 10%, 20%或骨干(0%水分), it is a significant factor that can determine the type 和 size of the screening unit. It also allows the manufacturer to provide recommendations critical to achieving 最大筛分效率.
5. 什么是需要的分界点?
Some applications may only have one separation point; others may have six. 是的, there are 振动屏幕 with five or six decks per machine, 是的, we have made 回转圆筒 with five different sizes of screen media openings specified in one unit. 再一次。, providing the particle size separations is a critical factor.
6. 需要多大的筛选效率啊?
没有任何筛选设备是100%有效的. Oversized material is always going to be present in an undersized product, 和 fines are always going to need removed from the feed stream. 你可能没有意识到这一点，但这是真的!
的 degree of screening efficiency that can be tolerated makes a profound effect on the size of machine selected. 有时, the sizing screen is only removing near-sized fines before a crusher, 所以不需要精确的切割. 在其他时候, the sizing screen is the classifying unit for the final product, 所以需要高效率.
的re’s a big difference between an 80% clean product 和 a really tight 95% efficiency in which the top-sized 和 lower-sized limits of the finished product must be as clean as possible.
7. 还有什么特殊要求吗?
其他功能, such as adding water for washing 和 making a better separation to allow a cleaner coarse product, are sometimes desired on 振动屏幕 和 回转圆筒.
On some screening units, features like screen heating 和 ball tray decks allow for cleaner products.
Special requirements may also include the machine’s drive mechanism, 哪些可以提高筛选效率.
If you have requirements like this, you should advise your potential supplier.
8. Do you have a preference to the 屏幕媒体类型?
Many screen media options are available on screening devices, 像编织钢丝, 冲孔钢板, 橡胶和聚氨酯, 举几个例子. From your previous experiences, you may have a preference.
编织丝网.
的 屏幕媒体类型 can determine the percent of open area, which can affect the size of the screening unit. It can also affect the number of decks on a vibrating unit or the diameter 和 length of a trommel.
把它们放在一起
Most screening equipment manufacturers have decades of experience in machine size selection, with thous和s of units in service of the types they offer.
Even if you have zero knowledge of particle size screening equipment, a viable dealer or manufacturer should be able to supply you with the right machine selection once you provide as much complete application data as you can by answering these eight questions.
