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Warehousing and Distribution
Published in A. Ravi Ravindran , Paul M. Griffin , Vittaldas V. Prabhu , Service Systems Engineering and Management, 2018
A. Ravi Ravindran , Paul M. Griffin , Vittaldas V. Prabhu
Industrial trucks move products over variable paths. Pallets are normally moved by this type of equipment. The simplest type of industrial truck is a hand truck. This is used manually and moves cases or stacks of cases. Pallet jacks have forks that allow for the insertion in a pallet to lift it and move it. They can come in manual or powered form. A lift truck (Figure 6.6) is a vehicle with a set of forks to move pallets. Not only can they be driven through the warehouse, but they have the ability to lift the pallet to either stack or place in shelving. The most automated version of an industrial truck is an automated guided vehicle. These can travel along a fixed guide path (e.g., along a buried wire or magnetic tape network) or can be guided through a navigation system such as laser guidance or magnetic spot guidance system, which uses reference points that are used to determine the position through triangulation.
Materials Handling and Storage
Published in W. David Yates, Safety Professional’s Reference and Study Guide, 2020
Pallet jacks can be either manual or electric. Injuries common to both types of pallet jacks include foot injuries, musculoskeletal injuries (back and shoulder), lacerations, and fractured bones. In addition, property damage can result for improper use of this equipment. As with other materials handling equipment, a pre-operational inspection of pallet jacks must be completed prior to their use. A general check of the overall structure of the equipment, including the handles, wheels, and forks must be performed prior to operation. If there is evidence of fluid leaks, the equipment must be locked out and placed “out-of-service” until repairs are made by a competent maintenance technician. The controls should be tested as part of the operational check.
Dry beneficiation of coal on KAT air table
Published in International Journal of Coal Preparation and Utilization, 2022
Davaasuren Jambal, Byoung-Gon Kim, Ho-Seok Jeon
As shown in Fig. 3a, NS and TT coal samples have relatively easy separation characteristics with a small amount of intermediate density fractions. Cumulative ash curves show that clean coal with around 10–15% ash can be recovered by removing 2.0 g/cm3 sink fractions. However, in the cases of KHG and KD coal samples, the high ash intermediate-density fraction makes these ROM coal samples hard to clean and the probable product ash content would be around 25% with 50–60% yield, even after removing the sink fractions. For each test, about 1 ton of raw coal was fed to the air table deck. Product, middling and reject streams were each collected in a 1-ton bag and weighed and recorded using a pallet jack with digital scale. About 5–10 kg of reference samples were sampled from each bag and analyzed for density distributions by Float & Sink test and each density fractions tested for ash contents using LECO TGA 701.
Experimental static data based damage localization of beam-like structures considering axial load
Published in Inverse Problems in Science and Engineering, 2021
M.S. Hashemi, R.A. Izadifard, O. Yazdanpanah
A simply supported beam-column with span L = 0.62 (m) shown in Figures 3–6, with different damage cases, is selected as example. The beam-column has a cross-section with dimensions of 0.04 × 0.01 (m) and 0.02 × 0.03 (m) presented in Figures 3–6, respectively. It is worth mentioning that Figures 5 and 6 are considered for multiple cracks. Modulus of elasticity is E = 2.1 × 1011 (N/m2). As shown in Table 1, for the assessment of the method, 4 damage cases including 12 different damage scenarios are considered. In the first four scenarios (case 1), the effects of axial load on damage detection method in damaged element 3 are investigated using both the experimental and theoretical methods. To evaluate the capability and robustness of the proposed method, case 2 with three damage scenarios is also examined for damaged element 2 considering different axial load. Moreover, Cases 3 and 4 are considered for multiple cracks. Figure 7 shows the experimental setup of the simply supported beam-column including modelling, assembling, LVDT, Data logger, VIRA software, Hydraulic jack, Pallet jack, platform, Load Cells, notches and so on.
Assistive devices for manual materials handling in warehouses: a systematic literature review
Published in International Journal of Production Research, 2021
Christoph H. Glock, Eric H. Grosse, W. Patrick Neumann, Andrew Feldman
Harris-Adamson et al. (2016) evaluated two pallet jack handles for pallet transportation tasks. The first investigated handle was a standard pallet jack handle that enables the worker to pull the pallet jack with one hand through the warehouse. The second handle was a longer prototype that allowed the worker to push the pallet jack with both hands, instead of pulling it. The objective of the new handle was to reduce awkward shoulder, trunk, forearm and wrist postures. The results of the study indicate that both muscle activity, compressive forces and anterior-posterior shear forces were consistently higher for the alternative handle, but that it was superior to the standard handle in terms of lateral shear, torsion and user preference. A related work is the one of Kim, Lee, and Chang (2015), who evaluated alternative angles of the handles of a cart that workers push through the warehouse. Their results indicated that most users felt comfortable with a 45° tilted handle, while a vertical handle led to a high strain on the wrists.