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Rollers series RR20

Rollers series RR20

Rollers series RR20

Product catalog summary
Introduction
The document provides technical specifications and usage guidelines for RR20 plastic rollers and RRA20 steel-plastic rollers used in belt conveyors. These rollers are designed for specific operational environments, emphasizing their suitability for corrosive conditions and their load-bearing capacities.

Specifications
  • Material and Design: RR20 rollers are made entirely of thermoplastic resin, offering lightness and elasticity, while RRA20 rollers combine steel and plastic for enhanced durability.
  • Load Capacity: Steel rollers can handle higher loads at low revolutions, whereas plastic rollers are limited by the fatigue strength of their structure.
  • Temperature Range: RR20 operates between -10°C and +50°C, while RRA20 can function between -10°C and +70°C.
  • Resistance: Both types exhibit excellent resistance to diluted acids and alkalines, with varying resistance to concentrated chemicals and organic solvents.

Applications
  • RR20 Plastic Rollers: Ideal for fast, continuous belt conveyors transporting powders or granulates in chemically aggressive environments.
  • RRA20 Steel-Plastic Rollers: Suitable for medium to heavy loads in harsh conditions, especially near the seaside or where frequent washing is required.

Manufacturing and Customization
  • Standard rollers come with CH30 mm attachments, with options for CH14 or CH17 upon request.
  • Custom lengths and materials (galvanized or stainless steel shafts) are available.

Performance and Load Ratings
  • Load ratings are provided for a lifespan of 30,000 hours at 20°C, with adjustments needed for longer durations.
  • Detailed tables specify load capacities across various dimensions and speeds.

Additional Notes
  • All dimensions are subject to machining tolerances, and the manufacturer reserves the right to modify products without notice.
  • Reproduction of the document's content is prohibited under copyright law.
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Catalog excerpts

Rollers series RR20-1

RULLORESINA RR20 PLASTIC ROLLERS RR20

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Rollers series RR20-2

RULLI PER TRASPORTATORI A NASTRO IN RESINA TERMOPLASTICA PLASTIC ROLLERS FOR BELT CONVEYORS Un rullo interamente in resina termoplastica è leggero ed adatto a lavorare in ambienti corrosivi. Se si confrontano le capacità di carico di un rullo d’acciaio e del corrispondente rullo in plastica, si possono fare le seguenti considerazioni: – un rullo d’acciaio è dimensionato per carichi che, a basso numero di giri, possono essere anche molto elevati; – nel rullo in plastica il carico max. è limitato dalla resistenza a fatica della struttura ed in particolare del tubo; – acquistano importanza prevalente...

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Rollers series RR20-3

PLASTIC ROLLERS RRSO Acidi diluiti ottima resiste Diluted acids very good resists Acidi concentrati ottima non resiste Concentrated acids very good doesn't resists Alcali diluiti ottima ottima Diluted alkalines very good very good Alcali concentrati ottima debole Concentrated alkalines very good weak Solventi organici ottima (3) ottima (4) Organic solvents very good (3) very good (4) (3) Esclusi chetoni, esteri, idrocarburi aromatici e clorurati (4) Esclusi fenoli ed acido formico (3) Excluding chefones, esters, aromatic and chlorinated hydrocarbons (4) Excluding phenols and formic acid

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Rollers series RR20-4

RULLORESINA RR20 Tubo in PVC di grosso spessore. Testate in resina rinforzata con fibre di vetro. Asse Ø 20 ed attacco normale CH30 mm. Cuscinetti largamente dimensionati per lunghe durate. Lubrificazione a vita assicurata da protezioni di nuovo disegno nelle quali apposite tenute a labbro formano una camera a grasso che racchiude il cuscinetto. Una tenuta particolare a labirinto protegge ulteriormente il cuscinetto da corpi estranei come polveri e liquidi. STEEL RESIN ROLLER RRA20 Hanno la stessa costruzione dei precedenti ma con tubo in acciaio (naturale o zincato), ai posto del tubo in PVC....

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Rollers series RR20-5

  Larghezza nastro Belt width B [mm] 400 500 600 650 800 400 500 1000 600 1200 650 800 1000 1200 Peso  Weight  per mm Peso fisso L min min L L max max L Esecuzioni a richiesta Executions upon request Peso di un rullo completo Weight of a complete roll (Peso delle parti rotanti) [kg] (Weight of rotating parts)                                                                                                                               

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Rollers series RR20-6

RATED LOADS Le tabelle seguenti riportano i valori già calcolati, per una durata di progetto di 30.000 ore alla temperatura di 20°C. Per una durata superiore, ridurre i carichi moltiplicandoli per il coefficiente C. The tables below shows the loads of the rollers for a rated life of 30.000 hours at a temperature of 20°C. For longer rated lives loads are to be reduced by multiplying for C coefficient. Use the formulas of chapter N1 to calculate the loads beared by the rollers.

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Rollers series RR20-8

Tutte le dimensioni sono soggette a tolleranze di lavorazione e benché i disegni e le illustrazioni siano fedeli, non sono tuttavia impegnativi. La DUGOMRULLI si riserva di modificare i propri prodotti senza preavviso. La riproduzione anche parziale delle figure e del testo è vietata a norma del C.C. e della legge sui diritti d’autore. All dimensions are subject to machining tolerances, and although drawings and illustrations are exact, they place the manufacturer under no obligation whatsoever. DUGOMRULLI reserves the right to modify their products at any time without notice. Even a part reproduction...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.