In Fonderia 1 2024

TECNICO
• Portata fino a 700 m³/h
• Velocità del nastro fino a 0,35 m/s
• Larghezze tazze da 500 a 1.600 mm
• Layout customizzabile e design espandibile
• Trasportatore aperto o completamente chiuso
• Nessuna generazione ed emissione di polvere
di silice
• Livello di rumorosità ≤ 75 dB(A)
• Manutenzione ridotta e semplice
• Ridotto consumo energetico.
TRASPORTO TERRA
Il presente lavoro mira a dimostrare l’applicabilità
del trasportatore Superbelt ® B alla movimentazione
della terra di fonderia. I requisiti
dell’applicazione che incidono sul design del
trasportatore sono:
• Elevate capacità di trasporto
• Temperatura della terra anche superiore ai
150÷200°C
• Distribuzione granulometrica della terra
• Emissioni di polvere di silice cristallina respirabile
L’uso delle tazze soddisfa tutti i requisiti sopra
elencati. In particolare, evita il ritorno e la fuoriuscita
del materiale quando l’inclinazione del
nastro trasportatore supera i 18-22° |5| (Fig. 4).
Fig. 4 - Sezione tipica del Superbelt ® B.
Fig. 4 - Typical cross/section of Superbelt ® B.
SAND TRANSPORTATION
This paper aims to demonstrate the applicability
of the Superbelt ® B conveyor belt to the handling
of foundry sand. The application requisites
that affect the design of the conveyor belt are:
• High transport capacities
• Sand temperature also exceeding 150÷200°C
• Sand particle size distribution
• Respirable crystalline silica dust emissions
The use of buckets fulfils all the above requisites.
In particular, it prevents the return and spillage
of material when the inclination of the conveyor
belt exceeds 18-22° |5| (Fig. 4).
HEAT EXCHANGE CALCULATIONS
Design of the Superbelt ® B conveyor belt used
an approach based on one-dimensional and
computational fluid dynamics (CFD) models to
predict and simulate the bucket surface temperature.
The stationary thermal load of the bucket belt
was assessed using thermal analysis of their 3D
model (Fig. 5).
Based on a given bucket belt geometry and a
product transported at 750°C (selected to simulate
and verify the behaviour of the bucket in
a worst-case scenario), thermal analysis was
carried out to verify the temperature inside the
buckets.
Despite the high temperature of the transported
product, the buckets reach a constant temperature
of between 400 and 500°C. This is possible
because the return section of the belt is open,
so the buckets exchange heat by both radiation
and natural convection with the surrounding air
(Fig. 6).
After completing thermal analysis on a single
bucket, a simplified 3D model was prepared to
study the thermal cycle of the entire conveyor
belt (Fig. 7).
As shown in Fig. 7, the Superbelt ® B conveyor
belt consists of:
• Loading point where the product enters at
high temperature
• Transport section to cover the distance and
reach the unloading point
• Unloading section in downstream machines
• Return section where the buckets exchange
heat
The repetitive loading and unloading cycle
of the buckets leads to a heat transfer that
increases over time until an equilibrium is
reached (Fig. 8).
90
In Fonderia