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Musculoskeletal hazards and risk control
Published in Phil Hughes, Ed Ferrett, Introduction to Health and Safety in Construction, 2015
There are three common forms of conveyor – belt, roller and screw conveyors. The most common hazards and preventative measures are: the in-running nip, where a hand is trapped between the rotating rollers and the belt. Protection from this hazard can be provided by nip guards and trip devices;entanglement with the power drive requiring the fitting of fixed guards and the restriction of loose clothing which could become caught in the drive;loads falling from the conveyor. This can be avoided by edge guards and barriers;impact against overhead systems. Protection against this hazard may be given by the use of bump caps, warning signs and restricted access;contact hazards prevented by the removal of sharp edges, conveyor edge protection and restricted access;manual handling hazards;noise and vibration hazards.
Annotated Dictionary of Construction Safety and Health
Published in Charles D. Reese, James V. Edison, Annotated Dictionary of Construction Safety and Health, 2018
Charles D. Reese, James V. Edison
Thus, conveyors and other such equipment need to be equipped with emergency cutoff switches, and workers should be protected from the conveyors’ moving parts by guards. All nip points and noise or tail pieces should be protected so workers cannot come into contact with moving pulleys, gears, belts, or rollers (see Figure 19). The conveyor should be shut down and locked out/tagout during maintenance and repair work.
On solving interrelated technological and transport problems for deep open pit mining
Published in Tad S. Golosinski, Val Srajer, Off-Highway Haulage in Surface Mines, 1989
Currently under development are 'conveyor train' systems, shown in figure 1. This transport system combines the advantages of conveyor and train transport systems. The two main advantages of a conveyor train system are the absence of transferring operations, and the ability to haul lumpy material, without prior crushing.
Scheduling in Industrial environment toward future: insights from Jean-Marie Proth
Published in International Journal of Production Research, 2023
Marzieh Khakifirooz, Michel Fathi, Alexandre Dolgui, Panos M. Pardalos
This represents a specific case of the ‘cyclic job shop problem’ subclass. Some of these challenges assume that setup and transit periods are negligible, while others explicitly consider material handling devices with significant operating times. In the cyclic flow shop, the number of machines is predetermined. Each machine is arranged sequentially, and all tasks must follow the specified sequence when visiting the machines. A conveyor belt or another material handling device transfers tasks to and from fixed stations, where they undergo prescribed activities. Typically, transportation times are considered to be insignificant. The objective of the cyclic flow shop scheduling problem is to determine the order (i.e.task sequence for each machine) in which the machines repeatedly execute the jobs. In the permutation flow shop, the task processing sequences on each machine are identical.
Triangular cross-section peristaltic conveyor for transporting powders at high speed in printers
Published in Advanced Robotics, 2018
Yasuyuki Yamada, Kyota Ashigaki, Shun Yoshihama, Kai Negishi, Koichi Kato, Taro Nakamura
Various forms of powdered materials are widely treated as final or intermediate products, such as foods, medicines, and industrial products. Furthermore, various powdered material conveyers are used based on the characteristics of the materials to be transported. These conveyors can be broadly classified into two categories, i.e. mechanical and pneumatic. Mechanical conveyance devices include belt conveyors [1], screw conveyors [2,3], and vibration conveyors [4], whose amplitude and frequency are adjusted with respect to the object being transported. Pneumatic conveyance devices move powdered materials using different types of fluid flow [5]. Even though a variety of conveyors exist for powdered materials, there are still areas where such devices do not meet the requirements of the application, such as in printers (particularly industrial printers), as shown in Figure 1(a).
Real-time reconciliation of a geometallurgical model based on ball mill performance measurements – a pilot study at the Tropicana gold mine
Published in Mining Technology, 2018
T. Wambeke, D. Elder, A. Miller, J. Benndorf, R. Peattie
The comminution circuit comprises of a primary crusher, secondary crusher, High Pressure Grinding Rolls (HPGR) and a ball mill. The HPGR screen has a top size of 2.75 mm, resulting in a typical ball mill feed of 500 to m (). The upper part of Figure 4 displays a simplified version of the plant flowsheet (to be discussed later in detail). Conveyor belt speeds, throughput values, recirculating loads, flow velocities and mill performance are continuously monitored. The related sensor readings are written to a database at five-minute intervals.