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Julian Roman Test Document

 

TEST REPORT
I Or Lategan Road,

Groenkloof


TEST HOUSE
Private Bag X191, Pretoria, 0001
Tel: +27 (012) 428 7911 Fax: +27 (012) 344 1S68
Website:
www.sahs.comi


Your ref: 0/No. PO 100004
Attention: Mr GL Roman
Enquiries: MD Mutengwe
a (012) 428-7028
P 0 Box 15484
%awl No,: 7222/208754 I NM76
SINOVILLE

2002 - 04 - 16
TESTING OF IDLER ROLLS FOR CONVEYOR BELTS


1. DESCRIPTION OF SAMPLE
The sample consisted of nine 25 mm series, 125 mm nominal diameter and 300 mm nominal gauge length non-metallic conveyor idler rolls, with closed ends identified by ourselves as specimens 1 - 9. The rolls consisted of a 102 mm steel tube of thickness 2 mm and a 10 mm polyethylene lagging on the outer surface.


2. OBJECT OF TEST
To determine whether the sample complied with the following requirements of SABS 1313-1:1999 'Troughed belt conveyor idlers (metallic and non-metallic) for belt speeds of up to 5 m/s':


a. Design requirements (Subclause 4);
b. Material requirements (Subclause 5);
c. Types and series of idlers and types of roll shaft ends (Subclause 6);
d. Dimensional requirements (Subclause 7);
e. Performance requirements (Subclause 8);
f. Toxicity index (Subclause 9.6); and
g. Marking (Subclause 11.2).


3. SUMMARY OF TEST RESULTS
The sample complied with the requirements.

4. TEST RESULTS
4.1 MATERIAL REQUIREMENTS (Subclause 5)
4.1.1 Non-metallic rolls (Subclause 5.2). The rolls were manufactured from Polyethylene material. The material was not evaluated for compliance with SABS 533-2.
4.1.2 Shafts (Subclause 5.4). The shafts were manufactured from steel material.


4.2 DIMENSIONAL REQUIREMENTS
4.2.1 Diameter and wall thickness of rolls (subclause 7.1)

 

Specimen

Roll diameter, mm

Wall Thickness, mm

Actual

Specified

Actual

7

126,7

126,6 - 127,4

14,8

8

126,7

14,8

9

126,8

14,8

# The wall thickness for non-metallic rolls was not specified.


4.2.2 Roll shaft ends (subclause 7.2)

 

Specimen

Shaft end diameter, mm Width across flats, mm Length of flats, mm

7

24,98 17,73 11,98

8

25,00 17,73 11,99

9

24,96 17,72 11,96

Specified

24,5 - 25,01 17,5 - 18,2 11,5 L 12,2


4.2.3 Gauge length of rolls, twist angle of flats and peripheral run-out of rolls (subclauses 7.6.2, 8.9.2 and 8.2 respectively)

 

Specimen

Gauge length, mm Twist angle of lfats Peripheral run-out of rolls, mm

7

299,50 Less than 1,00 0,10

8

299,60 Less than 1,00 0,09

9

299,70 Less than 1,00 0,16

Specified

299 - 300 1,00 max 0,50 max

NOTE: + The specified gauge length is subject to a belt width of 750 mm for a 3-roll idler (Table 6),


4.3 AXIAL MOVEMENT (Subclause 8.1)
When tested in accordance with subclause 10.4, the movement of the shatfs of specimens 7, 8 and 9 was 0,11 mm, 0,09 mm and 0,12 mm (Specified 0,7 mm max.).


4.4 RUNNING FRICTION FORCE (Subclause 8.3)
When tested in accordance with subclause 10.7, the running friction force was as follows:

 

Specimen

Running friction force, N Friction force after 1 h rest period, N

7

2,60 2,82

Specified

2,8 max 4,2 max


4.5 RESISTANCE TO PRESSING OUT (Subclause 8.4)
When tested in accordance with subclause 10.8, the sample withstood a proof load of 15 kN without any sign of rupture.

4.6 BREAKAWAY MASS (Subclause 8.5)
When tested in accordance with subclause 109, the breakaway force recorded was as follows:

 

Specimen

Breakaway mass (g)

7

250

8

240

9

220

Specified

250 max


4.7 BEARINGS
4.7.1 Bearing housings (Subclause 8.10.1). The bearing housings were fixed into the rolls in such a way that they did not become loose during the resistance to press out test (Subclause 10.8).


4.7.2 Axial bearing fixing (Subclause 8.10.3). The bearings were located on, and secured to, the shaft.


4.7.3 Bearing assembly (Subclause 8.10,4), The bearings used were of the deep groove ball bearings type (HLB 420205).


4.8 SEALS (Subclause 8.10.5)
4.8.1 Resistance to ingress of dust. When specimens 4, 5 and 6 were tested in accordance with subclauses 10.6.1.1, the seals showed no sign of powder penetration after running for 96h in talc powder.


4.8.2 Resistance to ingress of water. When tested in accordance with subclause 10.6.1.2, the ingress of water was as follows:

 

Roll Test

Mass of Rolls, kg

Total mass ingressed, kg

 

Test Atfer 24 h Atfer 48 h Atfer 72 h After 96 h  

1

3,944 3 951 3,959 3,962 3 964 0 ,010

2

3,925 3,932 3,935 3,935 3,935 0,010

3

3,937 3,942 3,945 3,945 3,951 0,014


4.9 LUBRICATION (Subclause 8.10.6)
When specimens 1, 2 and 3 were tested in accordance with subclause 10.6.2,
a) no rust was visible on the bearings;
b) no discolouration of the grease was visible; and c) the grease did not wash out from the bearings.


4.10 TOXICITY INDEX (Subclause 9.6).
When tested in accordance with the Naval Engineering Standard (NES) 713 'Determination of the toxicity index of products of combustion from small specimens of materials', the smoke
toxicity index of the sample was 2 (Specified: 5 max.).


4.11MARKING
4.11.1 Rolls (Subclause 11.2.2.). Each roll was marked as follows:
The test sample will be disposed of if not collected within a period of 6 weeks of the date of this report.


C van lloeye
Test Officer
Manager: Mechanical and Fluid Technology

 

 

 

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