SIST EN 16974:2017
(Main)Conveyor belts - Indentation rolling resistance of conveyor belts related to belt width - Requirements, testing
Conveyor belts - Indentation rolling resistance of conveyor belts related to belt width - Requirements, testing
This draft European Standard defines a method for the determination of the width related indentation rolling resistance of conveyor belts. The goal is that the method easily and quickly delivers values which are reproducible and relevant for the practical use. The test results enable a comparing evaluation and the design of belt conveyors with steelcord and fabric conveyor belts.
This draft European Standard is not suitable or valid for light conveyor belts described in EN ISO 21183-1.
Fördergurte - Gurtbreitenbezogener Eindrückrollwiderstand von Fördergurten - Anforderungen, Prüfung
Diese Europäische Norm legt ein Verfahren zur Bestimmung des auf die Gurtbreite bezogenen Eindrückrollwiderstands von Fördergurten fest. Das Ziel ist, auf einfache und schnelle Weise reproduzierbare und für die Praxis verwendbare Werte zu liefern. Die Messergebnisse können eine vergleichende Bewertung von Fördergurten ermöglichen und zur Auslegung von Gurtförderern mit Stahlseil- und Textilfördergurten herangezogen werden.
Diese Europäische Norm ist nicht geeignet für leichte Fördergurte, die in EN ISO 21183-1 beschrieben sind.
Courroies transporteuses - Résistance au roulement par suite d’enfoncement des courroies transporteuses en fonction de la largeur de courroie - Exigences, essais
La présente Norme européenne définit une méthode de détermination de la résistance au roulement par suite d’enfoncement en fonction de la largeur des courroies transporteuses. L’objectif de cette méthode est d’obtenir facilement et rapidement des valeurs reproductibles et pertinentes pour l’utilisation pratique. Les résultats d’essai permettent de réaliser une évaluation comparative et de concevoir des courroies transporteuses à câbles d’acier et des courroies transporteuses en tissu.
La présente Norme européenne n’est pas applicable ou valable pour les courroies transporteuses légères décrites dans l’EN ISO 21183-1.
Naprave za kontinuirni transport - Trakovi tračnih transporterjev - Kotalni upor trakov tračnih transporterjev v odvisnosti od širine pasu - Zahteve, preskušanje
Ta osnutek evropskega standarda določa metodo za ugotavljanje kotalnega upora trakov tračnih transporterjev v odvisnosti od širine pasu. Cilj je, da metoda preprosto in hitro zagotavlja vrednosti, ki so ponovljive in pomembne za praktično uporabo. Rezultati preskusov omogočajo primerjavo vrednotenja in oblikovanja trakov tračnih transporterjev z jekleno vrvjo in trakov tračnih transporterjev iz tkanine.
Ta osnutek mednarodnega standarda ni primeren oziroma veljaven za lahke trakove tračnih transporterjev, opisane v standardu EN ISO 21183-1.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Fördergurte - Gurtbreitenbezogener Eindrückrollwiderstand von Fördergurten - Anforderungen, PrüfungCourroies transporteuses - Résistance au roulement par suite d’enfoncement des courroies transporteuses en fonction de la largeur de courroie - Exigences, essaisConveyor belts - Indentation rolling resistance of conveyor belts related to belt width - Requirements, testing53.040.20Deli za transporterjeComponents for conveyorsICS:Ta slovenski standard je istoveten z:EN 16974:2016SIST EN 16974:2017en,fr,de01-marec-2017SIST EN 16974:2017SLOVENSKI
STANDARD
SIST EN 16974:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16974
September
t r s x ICS
w uä r v rä t r English Version
Conveyor belts æ Indentation rolling resistance related to belt width æ Requirementsá testing Courroies transporteuses æ Résistance au roulement par suite d 5enfoncement relative à la largeur de courroie æ Exigencesá essais
Fördergurte æ Gurtbreitenbezogener Eindrückrollwiderstand æ Anforderungená Prüfung This European Standard was approved by CEN on
s u July
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x { y vã t r s x ESIST EN 16974:2017
EN 16974:2016 (E) 2 Contents Page European foreword . 3 1 Scope . 4 2 Normative references . 4 3 General information . 4 4 Symbols and units . 5 5 Test rig . 6 6 Preparation of test samples . 7 7 Procedure. 7 8 Calculation and expression of results . 8 9 Test report . 8 Annex A (informative)
Conversion of the measured width related indentation rolling resistance to a 3-part idler station . 10 Bibliography . 12
SIST EN 16974:2017
EN 16974:2016 (E) 3 European foreword This document (EN 16974:2016) has been prepared by Technical Committee CEN/TC 188 “Conveyor belts”, the secretariat of which is held by SNV. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2017, and conflicting national standards shall be withdrawn at the latest by March 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16974:2017
EN 16974:2016 (E) 4 1 Scope This European Standard defines a method for the determination of the width related indentation rolling resistance of conveyor belts. The goal is that the method easily and quickly delivers values which are reproducible and relevant for the practical use. The test results enable a comparing evaluation and the design of belt conveyors with steelcord and fabric conveyor belts. This European Standard is not suitable or valid for light conveyor belts described in EN ISO 21183-1. 2 Normative references Not applicable. 3 General information The indentation rolling resistance is caused by the energy loss connected to the deformation of the conveyor belt due to its contact with the idler. Apart from the technological properties of the conveyor belt the magnitude of the indentation rolling resistance depends on the following factors: — design of the conveyor belt, especially the pulley side cover plate thickness; — vertical load; — idler diameter; — ambient temperature; — belt speed. The width related indentation rolling resistance is measured in a test rig with an idler which exerts an evenly distributed vertical force on the belt. An indentation rolling resistance to be used for the design of belt conveyors for an idler station with more than one idler can only be calculated considering the vertical forces and their distribution between belt and idler (refer to Annex A). SIST EN 16974:2017
EN 16974:2016 (E) 5 4 Symbols and units Table 1 shows the symbols and units used in this standard. Table 1 — Symbols and units Symbol Meaning Unit B Belt width mm DR,M Diameter of measuring idler mm DR,G Diameter of the opposing idler mm DTr Pulley diameter mm FE Indentation rolling resistance acting on one idler N FE,ges Total indentation rolling resistance acting on an idler station with three idlers N F´E Indentation rolling resistance related to belt width N/mm FM,h Horizontal force acting on the measuring idler turning clockwise (FM,h,r) or anti-clockwise (FM,h,le) N FM,v The vertical force on the measuring idler corresponding to the load N F´M,v Vertical force related to the belt width N/mm Fn Normal force acting on an idler N FR Idler rolling resistance N L Distance axis-to-axis mm TU Ambient temperature °C bK Width of the rubber edge of the belt mm ca Factor in the approximation equation for the width related indentation rolling resistance - cb Exponent in the approximation equation for the width related indentation rolling resistance - bR Length of the contact line between belt and idler shell mm d Steelcord diameter mm q Length related load acting on the idler N/mm ns Number of steelcords - s1 Cover plate thickness, carrying side mm s2 Cover plate thickness, pulley side mm t Cord pitch mm v Belt speed m/s z Coordinate of length mm SIST EN 16974:2017
EN 16974:2016 (E) 6 Table 2 described the used indices in this standard. Table 2 — Indices Index Meaning m Middle idler s Side idler 5 Test rig The testing apparatus is a test rig with a rotating belt sample, constructed with a drive pulley and a tensioning pulley. Both pulleys have a minimum diameter of 800 mm (Figure 1). The distance axis-to-axis has a minimum value of 3 500 mm. For high strength conveyor belts and large splice lengths differing pulley diameters and distances axis-to-axis shall be agreed upon with the operator of the test rig. The belt speed is adjustable and is constantly monitored with appropriate sensors. The complete test rig is placed in an isolated climate chamber, so that the ambient temperature can be adjusted with suitable heating and cooling devices. In the top run there is a special measuring arrangement with which an idler can be pressed down on to the belt with a defined force. As counter support an idler is installed. This idler has a minimum diameter DR,G of 400 mm and the diameter shall be larger than the diameter of the measuring idler by a minimum factor of 1,5. ≥×R,GR,M1,5DD (1) The diameters DR,G and DR,M shall be chosen corresponding to the parameters of the belt conveyor and to be agreed upon with the operator of the test rig. The test rig shall be constructed in a way that it is possible to install the test belt as an endless belt. Figure 1 shows a schematic picture of the test rig.
Key 1 temperature isolating chamber Figure 1 — Schematic picture of the test rig SIST EN 16974:2017
EN 16974:2016 (E) 7 For the measurement of the indentation rolling resistance idlers with varying diameters and shell lengths are used. These are installed in an adjustable fram
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