GB/T 33514-2017Steel cord conveyor belts—Determination of the lateral and vertical displacement of steel cords (English PDF)

2.1 Instrument

NOTE: If there is a similar or more accurate instrument, it can also be used.

2.1.1 Band tape with scale of 1.0mm.

2.1.2 Hand-held optical magnifying glass with a scale of 0.1mm, and the magnification is no less than 8×.

2.1.3 Dial gauge with a scale of 0.1mm.

2.1.4 The flat horizontal surface used for placing the full-width conveyor belt.

2.2 Specimen

The specimen shall be of full width and no-less-than-50mm length of the belt. The cutting edge shall be smooth and free of dirt; the steel rope shall be clearly exposed.

If the cutting edge is not very smooth, the specimen can be prepared in a different manner; so that ensure accurate measurement of the rope position in accordance with this Standard.

2.3 Test Procedures

2.3.3 Measurement of pitch in the selected area (see Figure 2)

Optionally select 21 pieces of consecutive and adjacent steel ropes from the specimen.

Use dial gauge (2.1.3) or hand-held optical magnifying glass (2.1.2) to measure the distance of every two adjacent steel ropes among the 21 pieces of steel ropes; and record their values as t1, t2,... t20.

NOTE: If the pitch cannot be measured with naked eye in the selected area; use the above magnifying glass to enlarge the pitch (maximum 20×) for accurate measurement.

Selected Area 3 Method B. Measurement of Vertical Displacement of Steel Rope against the Average Height of Rope

NOTE: This test is only carried out under the condition that the conveyor belt has at least one side with the uniformly-thick covering layer. Because the outer surface of the covering layer with uniform thickness is the reference for measuring the height of the rope. Different references may affect the accuracy of the test.

3.1 Instrument

NOTE: If there is a similar or more accurate instrument, it can also be used.

3.1.1 Dial gauge described in 2.1.3.

3.1.2 Hand-held optical magnifying glass described in 2.1.2.

3.1.3 Horizontal surface described in 2.1.4.

3.2 Specimen