Hoisting system equipment

Dual pass tramp removal—to protect downstream conveying and hoisting system equipment and promote high system availability... 

In this paper the hoisting system is assumed to operate 70% of the year corresponding to 6,132 operating hours. The transformers are assumed to be connected at all time. For the life cycle cost the life time of the equipment is set to 20 years in this study. 

The efficiency is a measure of useful output power or energy of a device or system. In this paper we will study the efficiency of electrical equipment and the total hoisting system for a mine hoist. The total efficiency for a mine hoist is defined as the gained potential energy divided by the total energy potential plus energy losses from both mechanical and electrical devices as in Equation 5. 

Figure 14 md Figure 16 show the electrical losses for the three different alternatives, nor-mcd, energy efficient md oversized transformer design for the two hoisting systems. Figure 15 Figme 17 showthe relative cost of energy, cost of equipment and LCC relative to normal design.

All other equipment not belonging to the drive system are referred as the auxiliaries. The auxiliaries are equipment such as auxiliary transformer, switchgear (medium and low voltage), bearing lubrication, brake hydraulic station, control equipment (controllers, driver s desk, PLCs and screens) and shaft equipment (two level boxes) and the auxiliary cables. The auxiliary total power used in this example is 19 kW and no differences have been made between the two hoisting systems. 

The most efficient utihzation of the motor losses is apphcable in locations with smnmer/winter climate where the hoist room needs heating during a substantial part of the yeru. The outlet ur from the motor is directly vented into the hoist room. A controlled damper instcJled in the wall outlet is opened when the ambient temperature is high. Another controlled damper is installed between the hoist room and the motor ventilation intake air plenum chamber. In this way the inlet air is preheated in the cold season. This reduces or eliminates the need for separate preheating equipment which would otherwise be required, which in turn would increase the total energy consumption of the hoisting system. A summary of different heat recovery equipment is shown in Table 10. 

With a hoisting system, there needs to be a loading pocket to feed the skips. The installation includes a pair of loading flasks fed by a single chute with a vibratory feeder to properly load the belt. The chute is equipped with an in-line chute that includes a chain gate to help meter the flow of material and an arc gate to shut off the flow entirely. The chute loads a vibratory feeder that loads the conveyor evenly to a flask to provide a metered amount of material to the skips. This portion of the system is illustrated in Figure 3. 

Hatch Goba (Pty) Ltd (Hatch) has been retained by the Client to design the shaft complex, including the shaft steelwork, shaft loadout conveyors, headgear and hoist house with all the required equipment specified by Hatch. As part of this work Hatch specified, enquired and adjudicated the offers for the hoisting systems for the Deeps Project. 

Mining companies need a comprehensive understanding of the total cost of ownership of both new and overhauled hoisting systems including all aspects of the capital and operating costs over the projected life of the operation as well as the salvage value of the equipment if the mine life is relatively short, in order to make a complete and thorough evaluation. 

Who Employers must train each employee who may be exposed to fall hazards while on, or hoisted by, equipment on the hazards of falling and the requirements for boom walkways steps, handholds, ladders, grabrails, guardrails and railings personal fall arrest and fall restraint systems. 

Portable Hand-Powered Crane. The portable hand-powered crane is similar in design to a small manual-lift truck, except that the load-carrying forks have been replaced by a boom and hook. This equipment is commonly used to move and position work pieces into and out of process equipment where volumes do not warrant a permanently installed hoisting system. It is also frequently found in maintenance and repair shops to assist in the disassembly and reassembly of in-plant equipment. Lifting is accomplished either through a hand winch and cable system or a manually operated hydraulic system. Typical lifting capacities are limited to 2000 lb (900 kg) or less. 

Systems with self-loading compactors. Container size and utilization are not as critical in stationaiy-coutaiuer systems using self-loading collec tion vehicles equipped with a compaction mechanism (see Fig. 25-61 and Table 25-59) as they are in hauled-container systems. Trips to the disposal site, transfer station, or processing station are made after the contents of a number of containers have been col-lec ted and compacted and the collec tion vehicle is fuU. Because a variety of container sizes and types are available, these systems may be used for the coUection of all types of wastes. Container sizes vaiy from relatively small sizes (0.6 m ) to sizes comparable to those handled with a hoist truck (see Table 25-58). 

The derrick is the frame structure from which the drill string in suspended on the drill line using a system of pulleys known as the crown and traveling blocks when working in the borehole. The drawworks or hoist is the key piece of equipment on the rig and is used to raise and lower the drill string and control the weight being applied by the drill bit on the rock face on bottom. 

Skip hoists can be used for all granular and lump grades but are more suitable for particles greater than 100 mm. Elevators — both belt-and-bucket and chain-and-bucket types — have been used for all grades of quicklime. The system should minimise spillage within the equipment and ensure that wear on linkages caused by the quicklime is minimised. 

This system can be used as management and maintenance of auxiliary analysis tools of hoist machine for the staff, so as to curb major accidents and prolong the service life of equipment, and ensure the normal production. The purpose of its main features includes real-time online monitoring and human-computer interaction. (Qiao et al. 2010). 

The GPR equipment is generally portable and self-contained enabling access to most structures. The antenna can be operated from the end of a long cable enabling large areas to be covered relatively easily. The technique demands hand access to the structure so hoists or scaffolding are often required. In North America vehicle mounted systems are nsed, as described in Section 4.4, on concrete and asphalt-covered bridge decks. 

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