Deep-lane storage of time-critical items: one-sided versus two-sided access

Boysen, Nils; Boywitz, David; Weidinger, Felix

doi:10.1007/s00291-017-0488-9

Cited by 18 publications

(14 citation statements)

References 20 publications

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“…As a safety device for limiting the speed of movement of pallets with a load (hereinafter referred to as the pallets) in gravity pallet racks [1,2,3], centrifugal friction rollers have found the most widespread use [4]. However, they have a number of disadvantages, the main of which is the wear of the brake facing, and, as a consequence, the change in the braking characteristics of the roller.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model of the Process of Pallet Movement Along the Magnetic Type Centrifugal Brake Roller

2021

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One of the main elements of safe operation of gravity flow racks used in pallet racks is a brake roller. The most promising design is a centrifugal brake roller of magnetic (eddy current) type. The principle of operation of such rollers is based on the laws of electromagnetic induction and involves the deceleration of a conductor moving in a magnetic field, due to the interaction of eddy currents (or Foucault currents) arising in the volume of the conductor, with an external magnetic field. The mathematical model of the process of pallet movement along a centrifugal brake roller of magnetic type is developed in the article. The equation of the speed of movement of the pallet along the centrifugal brake roller of magnetic type is obtained. Comparative analysis of the speed of movement of a pallet along centrifugal and disc brake rollers of magnetic type is carried out.

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Section: Introductionmentioning

confidence: 99%

Mathematical Model of the Process of Pallet Movement Along the Magnetic Type Centrifugal Brake Roller

2021

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“…Гравитационный стеллаж (рисунок 1) для паллет является одним из видов блочного хранения или глубинных стеллажных систем хранения [1,2,3] и состоит из статической части (металлоконструкции) и динамической части (ролики, устройство остановки и разделения паллет, тормозные ролики и др.) [4].…”

Section: Introductionunclassified

Mathematical Model of the Motion Pallet Process on Brake Magnetic Type Roller

2020

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Introduction. One of the main elements of the safe operation of gravity roller conveyors used in pallet racks is a brake roller. The most promising design is the brake roller magnetic (eddy current) type. The operation principle of such rollers is based on the laws of electromagnetic induction and involves the braking of a conductor moving in a magnetic field, due to the interaction of eddy currents (or Foucault currents) arising in the volume of the conductor with an external magnetic field. However, in the market of warehouse shelving equipment, brake magnetic rollers are not widely used due to their high cost, which is primarily due to the lack of domestic designs and methods for their calculation. The aim of the work is to develop a mathematical model of the moving pallets process on a magnetic type brake roller.Materials and methods. The paper presented the theoretical study results on the development of a mathematical model of the moving pallets process on a magnetic type brake roller, described in works on centrifugal friction rollers and eddy current brake devices.Results. The main parameter determining the functions of the brake magnetic roller and hence the speed of the pallet along the gravity roller conveyor is a magnetic viscosity coefficient. The speed dependence of the pallets on the brake magnetic roller for various values of a magnetic viscosity coefficient is determined, its analysis is carried out.Conclusions. A mathematical model of the moving pallets process on a brake magnetic roller is developed. The movement speed equation of the pallets on the brake magnetic roller is obtained. For a reasonable choice of the design parameters of the magnetic brake roller, experimental studies are required to determine a magnetic viscosity coefficient.

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“…Optimizing space utilization of a warehouse and maximising warehouse capacity, also reducing the travel by fork-lifts, can be achieved with block storage or deep-lane storage systems (Sulirova et al, 2017;Boysen et al, 2018;Boywitz and Boysen, 2018). One of such systems is pallet flow rack ( Fig.…”

Section: Introductionmentioning

confidence: 99%

A Method to Determine Allowable Speed for a Unit Load in a Pallet Flow Rack

Safronov

Носко

2019

Acta Mechanica Et Automatica

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Pallet flow rack are widely used in intralogistics to maximize warehouse capacity and to reduce the travel by fork-lifts. However, the use of pallet flow racks is associated with increased danger due to the use of gravity conveyors in their design. For this purpose, the gravity conveyors of pallet flow rack have a two safety elements – brake rollers and a stopping mechanism with pallet separator, which are working as a system. Brake rollers limit the speed of pallets, while the stopping mechanism allows exuding a pressure on the unloading pallet from the following behind it. A pallet should have such a speed, controlled by the brake rollers, so that it could be stopped by a stopping mechanism without damaging it. Based on the Cox impact theory, an original method for determining the allowable speed of a pallet in a pallet flow rack is proposed. The method ensures safe operation of the stopping mechanism with pallet separator and takes into account the mechanical properties and design parameters of the pallet separator stopper. A calculation example is provided for the most commonly used types of pallets – Euro pallet (1200 mm × 800 mm) and Industrial pallet (1200 mm × 1000 mm). The obtained results agree well with the pallet speed range of 0.2 to 0.3 m/s recommended by the manufacturers of pallet flow racks.

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Deep-lane storage of time-critical items: one-sided versus two-sided access

Cited by 18 publications

References 20 publications

Mathematical Model of the Process of Pallet Movement Along the Magnetic Type Centrifugal Brake Roller

Mathematical Model of the Process of Pallet Movement Along the Magnetic Type Centrifugal Brake Roller

Mathematical Model of the Motion Pallet Process on Brake Magnetic Type Roller

A Method to Determine Allowable Speed for a Unit Load in a Pallet Flow Rack

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