Batch plant
VIBE: the high-performance dosing feeder from Forglass ‘ 2, Kacper Musioł3, Andrzej Ciopa4, Radosław Tomasz Zejer1, Maciej Olesinski Jurek5 discuss an RVDS system which allows for accurate dosing of the feed transferred by feeders with rotating vibrators.
the precision of which comes at the cost of a number of disadvantages for the industry, including: � large mass of the drive, which translates into a greater mass of the entire feeder, � limited length and capacity of feeders, and � limited availability of spare parts - most of the electromagnetic drives are made to order for a specific weight of the feeder, which may mean as much as a three-month waiting period. Inertial drives allow the construction of feeders of any length, several times greater transport efficiency. However, those feeders have not been used in the glass industry due to their low dosing precision. The reason for this is their inability to stop the transport of the material without stopping the feeder drive. Stopping the inertial drive is associated with the desynchronisation of the motors while passing through the resonance zone and an increase in the kick coefficient when approaching the resonant slope of the feeder, the consequence of which is a complete loss of control over the transport process (from the moment the
drive is turned off, until the movement of the feeder body stops). The presented solution, thanks to a proprietary design, can combine the previously contradictory properties: the possibility of achieving high transport efficiency, with the accuracy of weighing out a precise portion of material, available only for electromagnetic drives. What this means for the industry is: � the possibility of a three-fold increase in the efficiency of dosing feeders while maintaining the same weight of the device, � the possibility of a two-fold reduction in the weight of the dosing feeder while maintaining efficiency � significant reduction of service costs and time. To achieve the above goals, it was necessary to solve the problems presented in this article.
Description Obtaining a precise dosing function by a vibrating feeder driven by two selfsynchronising vibrators, with opposite directions of rotation, requires that the speed of transporting the material along Continued>>
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V
ibrating feeders are widely used across many industries to transport bulk materials. A particular application of vibrating feeders is the process of precise dosing of materials for the needs of technological processes. The use of feeders driven by inertial vibrators for this purpose requires the feeder to work near the natural frequency and overcome resonant frequencies during the start-up and coasting of the device. Overcoming resonance zones and working at near-resonance frequencies may cause uncontrolled flow of the feed from the feeder chute, which has made it impossible to use such solutions in industrial practice. The possibility of precise dosing with inertial drive feeders is particularly critical to the glass processing industry. The market situation and the increasing demand for glass products have forced glass producers to increase the efficiency of their furnaces. Production lines with a capacity of 1000-1200 t/day for float glass and 300400 t/day for container glass, which were a phenomenon only a few years ago, have become standard today. The increased efficiency of glass furnaces requires the equipment preparing and transporting the raw materials to the furnace to increase its effectiveness. An important role in this process is played by vibratory feeders. These devices, together with the weighing system, are responsible for the correct dosing and weighing of individual raw materials, the process in which the quality and colour of the produced glass, directly depends. The requirement to maintain high precision of dosing has so far limited the choice of transporting devices to vibrating feeders based on electromagnetic drives,
27 Glass International December/January 2022
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12/01/2022 10:46:30
