ball mills.pptx
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Ball mills are mostly used grinding equipment that can grind materials either wet or dry with high efficiency. They are composed of a hollow cylindrical shell that rotates about its axis and is partially filled with balls made of steel, stainless steel, or rubber materials. The grinding is carried out through impact and attrition of the balls as the cylinder rotates, and the material is fed through the hollow shaft. Ball mills have advantages such as low installation cost, low production cost, and suitability for both batch and continuous operations. However, they also have disadvantages like high noise levels, relatively long milling times, and difficulty in cleaning. Ball mills find applications in grinding materials for industries like coal, pigments, and ceramics.
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4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
### Applications of TDM
- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
- **Digital Audio and Video Broadcasting**: TDM is used in broadcasting systems to transmit multiple audio or video streams over a single channel, ensuring efficient use of bandwidth.
- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
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Comparative analysis between traditional aquaponics and reconstructed aquapon...
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官方认证美国密歇根州立大学毕业证学位证书原版一模一样
原版一模一样【微信：741003700 】【美国密歇根州立大学毕业证学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
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ball mills.pptx
- 1. Ball Mills 1 Group NO 02
- 2. Contents • Introduction • Structure • Principle • Advantages • Disadvantages • Applications • Manufacturers • Questions 2
- 3. Introduction • Mostly used grinding equipment with high efficiency • Grinding can be carried out either wet or dry • hollow cylindrical shell rotating about its axis and Length of the mill is approximately equal to its diameter • partially filled with balls made up of Steel, Stainless steel or rubber • resistant materials such as Manganese, Steel or rubber • Balls occupy about 30-50% of the volume and dia of the ball 12 mm- 125 mm 3
- 4. Structure • Ball mill is mainly composed of • feed port • discharge port • grinding media • grinding cylinder • transmission department • liner 4
- 5. How does a Ball Mill Work? • The material uniformly enters the first chamber of the ball mill by the feeding device through the hollow shaft. • The chamber has stepped lining or corrugated lining, which is filled with steel balls of different specifications. • Then the rotation of the grinding cylinder generates centrifugal force to bring the grinding media to a certain height. • After falling, they hit and grind the material. • When the material is coarsely ground in the first warehouse, it enters the second warehouse through a single-layer compartment board. • The powder is discharged through the discharge raft to complete the grinding operation 5
- 6. 6
- 7. Advantages • The cost of installation is low • The cost of Production is low • It is suitable for materials of all degree of hardness • The grinding Meduim is cheap • Used for the grinding of explosive materials • Suitable for both batch &continuous operations 7
- 8. Disadvantages • High machine noise level especially if the hollow cylinder is made of metal, but much less if rubber is used. • Relatively long milling time. • It is difficult to clean the machine after use. • Contamination of product may occur as a result of wear and tear which occurs principally from the balls and partially from the casing 8
- 9. Application • The ball mill is used for grinding materials such as coal,pigments,and fedspar for pottery. • Grinding can be carried out in either wet or dry but the former is carried out at low speeds. • The advantages of wet grinding are less power consumption,increased capacity,no dust formation etc… • Dis advantages are high wear on the grinding medium and neccesity to dry the product 9
- 10. Manufacturers 10 Container Products Corporation Maag Automatik Inc
- 11. Questions 11
- 12. 12