GB 26483-2011Noise limits of mechanical presses (English PDF)

3.1 Noise limit open press

3.1.1 Open press the sound power level limits

Noise A-weighted sound power level LWA limit open press continuous idling time should not exceed specified in Table 1.

Table 1

Nominal power/kN limit sound power level LWA/dB (A) <=160 80 > 160 ~ 25 090 > 250 to 63095 > 630 100

3.1.2 Open press the noise level limits

Open press in continuous idling noise A-weighted sound pressure levels prescribed position limits LpA shall not exceed the provisions of Table 2.

Table 2

Nominal power/kN SPL limit LpA/dB (A) <=160 70 > 160 ~ 25 080 > 250 to 63085 > 63088

3.1.3 Open press impulse noise limits SPL

When open press load in a single stroke impulse noise A-weighted sound pressure levels prescribed position shall not exceed the limits specified in Table LpAI 3.

table 3

Nominal power/kN pulse SPL limit LpAI/dB (A) <=250 93 > 250 to 63095 > 63099

3.2 Noise limits Closed Press

3.2.1 Closed Press the sound power level limits

Noise A-weighted sound power level LWA limits Closed Press continuous idling time should not exceed specified in Table 4.

Table 4

Nominal power/kN limit sound power level LWA/dB (A) <=2500 110 > 2500 ~ 6300115 > 6300120

3.2.2 The noise level limits Closed Press Closed Press continuous idling noise A-weighted sound pressure levels prescribed position limits LpA shall not exceed the provisions of Table 5.

table 5

Nominal power/kN SPL limit LpA/dB (A) <=2500 85 > 2500 - 630 086 > 630 087

3.3 Noise limit screw press

3.3.1 Screw press sound power level limits

Screw press at a predetermined operating condition of noise A-weighted sound power level LWA shall not exceed the limits specified in Table 6.

Table 6

Nominal power/kN limit sound power level LWA/dB (A) <=1000 92 > 1000 to 160 094

Table 6 (Continued)

Nominal power/kN limit sound power level LWA/dB (A) > 1600 - 315 098 > 3150 ~ 6300101 > 6300110

3.3.2 Screw press noise level limits

Screw press when the conditions required to operate at a predetermined position of the A-weighted noise pressure level LpA shall not exceed the limits specified in Table 7.

Table 7

Nominal power/kN SPL limit LpA/dB (A) <=1000 76 > 1000 to 160 080 > 1600 - 315 082 > 3150 ~ 630 085 > 630 090

4.1 Noise level measurement method

Noise level measurement method mechanical presses shall comply with GB/T 23281 of.

4.2 Sound power level measurement

Sound power level measurement of mechanical presses shall comply with GB/T 23282 of.

Measurement conditions 4.3 screw press Noise Screw press operation when used as prescribed norms, the noise should be measured from the lowest position during the upward movement of the slider.

4.4 Noise Measurement Description

4.4.1 factory test only measures the noise level.

4.4.2 The new design or improve the design, technology, materials, new products after the noise level should be measured during the performance test; can then measure the noise Sound power level to the noise level of conformity assessment basis.