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Material Handling Systems
Published in Susmita Bandyopadhyay, Production and Operations Analysis, 2019
Belt conveyor can also be roller belt conveyor (having rollers below the conveyor belt for the movement of the loads), slider belt conveyor (for carrying loads over both horizontal and vertical planes), telescoping belt conveyor. Chain conveyor is also a type of powered conveyor that uses single or double chain in order to pull and move especially pallet type of loads. This type of conveyor also carries loads over both horizontal and vertical planes. Live roller conveyor is also a type of powered conveyor in which “force sensitive transmission is used to disengage rollers.” Live roller conveyor can be belt driven live roller conveyor, or line shaft driven live roller conveyor. Platform conveyor is another type of powered conveyor with platforms and with chain that runs continuously in infinite loop. Besides, there are slat conveyor (made of nonoverlapping slats), vertical reciprocating conveyor, sortation conveyor, cart-on-track conveyor, tow conveyor, trolley conveyor, screw conveyor, pneumatic conveyor, vibrating conveyor, bucket conveyor.
Risk Assessor's Toolbox
Published in Charles Yoe, Principles of Risk Analysis, 2019
Mind Tools* (N.D.) identifies three groups of causes. Physical causes involve tangible, material items that failed in some way. For example, a gate chain breaks. Human causes result when people do something wrong or fail to do something that was needed. Human causes can lead to physical causes. For example, the chain may have failed because it was not maintained or inspected for wear and tear. Organizational causes reflect faulty systems, processes, or policies used to make decisions. For example, gate chain inspections are eliminated because gate chains rarely fail.
Bearings, Slides, Guides, Ways, Gears, Cylinders, Couplings, Chains, Wire Ropes
Published in Don M. Pirro, Martin Webster, Ekkehard Daschner, Lubrication Fundamentals, 2017
Don M. Pirro, Martin Webster, Ekkehard Daschner
Chain couplings (Figure 8.60) have sprockets connected by a chain wrapped around and joined at the ends. The chain may be of either the roller or silent type. Roller chain couplings depend on the relative motion between the rollers and sprockets for their flexibility. Barrel-shaped rollers and special tooth forms may be used where large amounts of misalignment must be accommodated. Silent chain couplings depend on the clearance between the chain links and sprocket teeth for their flexibility.
Synthesis and crystal structures of two new uranyl coordination compounds obtained in aqueous solutions of 1-butyl-2,3-dimethylimidazolium chloride
Published in Journal of Coordination Chemistry, 2018
Fangyuan Wang, Lei Mei, Weiqun Shi, Taiwei Chu
An aqueous solution of [Bmmim]Cl was used to synthesize uranyl compounds 1 and 2. Of note, the O atoms are bridged atoms. As for Ot atoms of [CrO4] groups in 1, one Ot atom faces up and the other O atoms face down (Figure 3). In 1, [CrO4] shares three corners with adjacent uranyl groups in a tridentate fashion, leading to the formation of a 2D network via the increased connectivity of the chains combined with U and Cr (Figure 3). Notably, the chains can be classified into four kinds of chains (Figure 3). As demonstrated in Figure 3, the U(1) pentagonal bipyramidal moieties are linked with the two Cr(2) tetrahedra into chains, referred to as α1-chains (left up and right down for Ot) and α2-chains (left down and right up for Ot). The second types of chains are formed with the U(2) groups and two Cr(1) and will be called β1-chains (both left and right down for Ot) and β2-chains (both left and right up for Ot). These chains are condensed with the coordinated water molecules and chloride anions into novel [(UO2)2(CrO4)2Cl2(H2O)2]2− layers. For 2, the U ion is strongly bonded to two O atoms and further coordinated by four oxygen atoms and one chloride ion arranged at the equatorial vertices of the [UO6Cl] pentagonal bipyramid to form the serrated [(UO2)(C2O4)Cl]− chains.