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Research Approaches and Main Results on Manufacturing SMEs in South Africa
Published in Munyai Thomas, Mbonyane Boysana, Mbohwa Charles, Productivity Improvement in Manufacturing SMEs, 2017
Munyai Thomas, Mbonyane Boysana, Mbohwa Charles
Management lacks understanding of the manufacturing process due to the increased number of people on the assembly line, which is not easy controllable. The operations manager insists that there are as few employees on the line as possible, but during the operation, supervisors fail to follow the instructions and end up adding more workforce in the process. The more people there are on the line, the more expensive it is for the company to operate. The more confusing the line is, the less chance that Company B will reach the actual target as planned by the company. Due to the inefficient operation of the company, some employees leave and join other companies. The operations manager, on the instructions of upper management, only focuses on what is produced rather than also considering the costs incurred. There is also limited space for inventory and finished goods in this company. Material handling is done in the form of using trolleys.
Manual Handling
Published in Céline McKeown, Office Ergonomics and Human Factors, 2018
Although using a trolley lessens the burden of handling a load, it should not be forgotten that using it retains an element of manual handling as the load is pushed or pulled. The condition of the trolley affects how easy the task is; therefore, it is essential that all trolley or other mechanical equipment used for transporting loads should be well maintained. The wheels on a trolley often become worn or damaged, and if they interfere with the free movement of the load, the individual pushing it will have to overcome the resistance by increasing the force applied.
Manual Handling
Published in Céline McKeown, Office Ergonomics, 2007
Although using a trolley lessens the burden of handling a load, it should not be forgotten that using it retains an element of manual handling as the load is pushed or pulled. The condition of the trolley affects how easy the task is; therefore, it is essential that all trolley or other mechanical equipment used for transporting loads should be well maintained. The wheels on a trolley often become worn or damaged, and if they interfere with the free movement of the load, the individual pushing it will have to overcome the resistance by increasing the force applied.
Performance analysis of electric and diesel equipment for battery replacement of tethered LHD vehicles in underground mining
Published in Mining Technology, 2020
Antonio Nieto, Richard S. Schatz, Cihan Dogruoz
In underground soft rock mines, the mining equipment most commonly used, besides extraction equipment, are haulers, loaders, and locomotives. As mentioned above, these vehicles are also commonly found in hard rock underground mining operations. In underground hard rock mining, similar vehicles are used including low profile hauler (LHD) vehicles and drilling jumbos. Haulers haul material to dumping points, while LHD vehicles muck and haul material to dumping points over relatively short distances. Drilling jumbos are mainly used in hard rock mining for drilling holes for either installing bolts or blasting. Transportation of miners and materials in underground mining is a key operational task and locomotives are mainly used in underground mines to accomplish this task. There are different types of locomotives such as diesel-powered, battery-powered and trolley locomotives. Locomotives have been used for many years in underground mining and because of their reliability, they are preferred as a simple and economical solution for material and personnel transportation purposes. According to Miller (2000), compared to the battery vehicle from which it is derived, the fuel cell locomotive has equivalent power and tractive effort, at least twice the volumetric energy density, and greater availability. Moreover, in one of the studies conducted by the United States Department of Energy (DOE) a four-tonnage battery locomotive manufactured by RA Warren Equipment was adapted to run off a PEM fuel cell by Miller and Barnes (2002). However, battery-powered locomotives are usually more convenient and safer than the fuel cell locomotives because they do not have to be fuelled with a volatile, flammable fuel.