GB/T 18490.3-2017 English PDF

US$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 18490.3-2017: Safety of machinery -- Laser processing machines -- Part 3: Noise reduction and noise measurement methods for laser processing machines and hand-held processing devices and associated auxiliary equipment (accuracy grade 2)
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 18490.3-2017	359	Add to Cart	4 days	Safety of machinery -- Laser processing machines -- Part 3: Noise reduction and noise measurement methods for laser processing machines and hand-held processing devices and associated auxiliary equipment (accuracy grade 2)	Valid

Similar standards

GB/T 7247.1   GB/T 18490.1   GB/T 30117.2   GB/T 45239   GB/T 18462   GB/T 18490.2   

Basic data

Standard ID: GB/T 18490.3-2017 (GB/T18490.3-2017)
Description (Translated English): Safety of machinery -- Laser processing machines -- Part 3: Noise reduction and noise measurement methods for laser processing machines and hand-held processing devices and associated auxiliary equipment (accuracy grade 2)
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: L51
Classification of International Standard: 31.260
Word Count Estimation: 18,126
Date of Issue: 2017-12-29
Date of Implementation: 2018-07-01
Regulation (derived from): National Standards Bulletin 2017 No. 32
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 18490.3-2017: Safety of machinery -- Laser processing machines -- Part 3: Noise reduction and noise measurement methods for laser processing machines and hand-held processing devices and associated auxiliary equipment (accuracy grade 2)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Safety of machinery -- Laser processing machines -- Part 3.Noise reduction and noise measurement methods for laser processing machines and hand-held processing devices and associated auxiliary equipment (accuracy grade 2) ICS 31.260 L51 National Standards of People's Republic of China Mechanical safety laser processing machine Part 3.Laser processing machines and hand-held processing machines and Noise reduction and noise measurement methods for related auxiliary equipment (Accuracy level 2) (ISO 11553-3.2013, MOD) 2017-12-29 Released.2018-07-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Released by the Standardization Administration of China directory Preface III Introduction V 1 Scope 1 2 Normative references 1 3 Noise Hazard 2 4 Safety requirements and measures 2 4.1 General requirements for noise reduction 2 4.2 Measures to reduce noise2 5 Verification of safety requirements for noise reduction and/or protective measures2 6 User's Instructions 3 Appendix A (Normative Appendix) Noise Test Procedure (Accuracy Class 2) 4 Reference 10 Mechanical safety laser processing machine Part 3.Laser processing machines and hand-held processing machines and Noise reduction and noise measurement methods for related auxiliary equipment (Accuracy level 2)

1 Scope

This part of GB/T 18490 specifies the noise hazards and general requirements for noise reduction of laser processing machines and hand-held laser processing machines and measures, verification of safety requirements for noise reduction and/or protective measures, and procedures for noise testing. This section applies to laser processing machines and hand-held laser processing machines and their related products within the scope of GB/T 18490.1 and GB/T 18490.2 Noise reduction and noise measurement of auxiliary equipment. Noise emission characteristics include emission sound pressure level and sound power level at the operating station. The declared noise emission values allow the Comparison of industrial machines and hand-held laser processing machines. The use of the noise test procedure in Annex A ensures that the determination of the noise emission characteristic values can be reproduced at a specified level of accuracy sex. The noise emission measurement method specified in this section meets the requirements of the engineering law, that is, the accuracy is grade 2.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 3767 Acoustic sound pressure method—Engineering method for determining sound power level of noise source and sound energy level of approximate free field above reflecting surface (GB/T 3767-2016, ISO 3744.2010, IDT) GB/T 3768 Acoustic sound pressure method - A simple method for measuring the sound power level of noise sources above the reflecting surface using an envelope measuring surface (GB/T 3768-1996, eqvISO 3746.1995) GB/T 3785.1 Electroacoustic Sound Level Meter Part 1.Specification (GB/T 3785.1-2010, IEC 61672-1..2002, IDT) GB/T 14574 Marking and Verification of Noise Emission Values of Acoustic Machinery and Equipment (GB/T 14574-2000, eqvISO 4871. 1996) GB/T 16404.2 Determination of Sound Power Level of Noise Sources by Acoustic Sound Intensity Method Part 2.Scanning Measurement (GB/T 16404.2- 1999, eqvISO 9614-2.1996) GB/T 17248.2 Noise emitted by acoustic machinery and equipment—Measurement of sound pressure levels emitted at working locations and other specified locations Engineering method for approximate free field above a reflecting surface (GB/T 17248.2-1999, eqvISO 11201.1995) GB/T 17248.3 Noise emitted by acoustic machines and equipment—Measurement of sound pressure levels emitted at working locations and other designated locations On-site simple method (GB/T 17248.3-1999, eqvISO 11202.1995) GB/T 17248.4-1998 Noise emitted by acoustic machines and equipment is determined by the sound power level at the working position and other specified positions Set emission sound pressure level (eqvISO 11203.1995) GB/T 17248.5 Noise emitted by acoustic machines and equipment—Measurement of sound pressure levels emitted at working locations and other specified locations Environmental Amendment Law (GB/T 17248.5-1999, eqvISO 11204.1995) GB/T 18490.1 Mechanical Safety Laser Processing Machine Part 1.General Safety Requirements (GB/T 18490.1-2017, ISO / IEC 11553-1.2005, MOD) GB/T 18490.2 Mechanical Safety Laser Processing Machines Part 2.Safety Requirements for Handheld Laser Processing Machines (GB/T 18490.2-2017, ISO /IEC 11553-2.2007, MOD) GB/T 25078.1 Recommendations for the Design and Implementation of Acoustic Low-Noise Machinery and Equipment Part 1.Planning (GB/T 25078.1-2010, ISO /T R11688-1.1995, IDT) EN352-1 General requirements for hearing protectors Part 1.Hearingprotectors-Generalrequire- ments-Part 1.Ear-Muffs)

3 Noise Hazards

Noise from laser processing machines and hand-held laser processing machines can cause. a) permanent hearing loss; b) tinnitus; c) fatigue, tension and headache; d) other effects such as imbalance and loss of consciousness; e) hinder language communication; f) The audible alarm signal cannot be heard.

4 Safety requirements and measures

4.1 General requirements for noise reduction Noise reduction should be an integral part of the design process. According to the recommendations of GB/T 25078.1, special consideration should be given to the noise source. Noise reduction measures. According to the noise test procedures specified in this part, refer to similar applications of other laser processing machines, and use the actual noise emission value to assess whether noise reduction measures have been successfully applied. 4.2 Measures to reduce noise Appropriate measures should be taken to reduce noise. Special consideration should be given to the following. a) Choose a pump with a low noise level instead of sealing the pump; b) release aerodynamic energy (in order to save energy, unnecessary emissions should be avoided. Mufflers or exhaust filters should be considered); c) Fix pipelines that may vibrate with special fixing structures to reduce the noise generated when these parts move; d) Select low-noise fans and other components, or install with elastic support, or use shock absorbers to reduce the generation of laser noise sources; e) Adopt damping measures in cooling system and smoke exhaust system; f) The operation panel is fixed with reinforcing tape or noise damping material to prevent its vibration and reduce noise radiation; g) The noise-generating parts should be kept away from the operator as far as possible; h) Enclose the processing area with a closed or semi-closed sound enclosure to limit the noise radiation generated by laser processing from entering the environment. The above examples are not exhaustive. Other alternative technical measures (with equivalent or higher efficiency) may also be considered to reduce noise. 5 Verification of safety requirements for noise reduction and/or protective measures If the emission sound pressure level is higher than 70dB, the noise emission value should be measured by an appropriate measurement method, and should be given in the user manual Noise Emission Statement. In order to confirm whether it is necessary to measure according to the noise test procedure of Appendix A, a preliminary test can be carried out first. According to GB/T 3785.1, Preliminary tests can be measured using a more economical Class 2 sound pressure meter, and the measurement conditions are shown in A.9.but not for any environment modification or background Noise correction. If the A-weighted sound pressure level of the operating station measured under the specified conditions does not exceed 65dB(A), the procedures specified in this part will not be followed at this time. sequence for further measurements. The noise emission statement should be simply expressed as. emission sound pressure level LpA≤70dB. If the measured emission sound pressure level is greater than 65dB, the noise reduction measures, measurements, verifications and their documentation stated in this section are necessary. Table 1 presents the method for verifying the safety requirements for the reduction of noise emissions and/or protective measures. 6 User's Instructions The user's instructions for use shall include information on airborne noise emissions, determined and declared in accordance with Appendix A. a) The A-weighted emission sound pressure of the operating station should be stated, where it exceeds 70dB(A) and where it does not exceed 70dB(A); b) Where the C-weighted peak instantaneous sound pressure value of the operating station exceeds 63Pa (130dB is equivalent to 20μPa); c) The A-weighted sound power level emitted by the machine, where the A-weighted emission sound pressure level of the operating station exceeds 80dB(A). In addition, if further protection is necessary, you should. d) It is recommended to install possible noise shields, protective screens, etc. on the machine; e) Suggest additional noise reduction measures, such as the use of noise protective booths, and the necessary installation and assembly to reduce noise Require; f) It is recommended to use low noise operation mode or limited time operation; g) It is recommended to wear personal hearing protection (see EN352-1).

Appendix A

(normative appendix) Noise Test Procedure (Accuracy Class 2) A.1 Determination of emission sound pressure level A.9 specifies the measurement locations of A-weighted emission sound pressure levels in the operating station and other locations. All microphones should be located away from Ground or path level (1.55±0.075)m. The A-weighted emission sound pressure level shall be determined according to the Class 2 method of GB/T 17248.2 or the Class 2 method of GB/T 17248.5.If the environment bar If the measurement results cannot reach the accuracy level 2, then it should be determined according to the level 3 method of GB/T 17248.3 or the level 3 method of GB/T 17248.5. The reason for not using the accuracy level 2 method should be stated in the test report. Note. The advantage of using the 2-level method of GB/T 17248.2 is that when K2≤2dB, no environmental correction is required. For laser processing machines with a clear operator position, the emission sound pressure level shall be measured according to A.9.1. A-weighted emission sound pressure for hand-held laser processing machines (HLDs) without remote components (electrical equipment, cooling units, filter fans) The grade should be measured according to I in Table A.5. For hand-held laser processing machines (HLDs) with remote (several meters) components, the emission sound pressure level of each mechanical component should be measured individually. Hand-held tools should be measured according to Table A.5 I, and remote components should be measured according to Table A.5 II. In the above cases, if it is required to determine the sound power level of HLDs, GB/T 17248.4-1998 may be used. But hand-held laser tools Separate from remote components. The emission sound pressure level of hand-held tools can be determined by the sound power level according to GB/T 17248.4-1998Q=11dB. If the noise generated by the relevant components reaches the sound pressure level that should be declared, the sound pressure level should be determined according to 6.2.3d) in GB/T 17248.4-1998. According to GB/T 3767, the measuring surface is about 1m away from the reference body at this time. A.2 Determination of sound power level A.2.1 Basic method The A-weighted sound power level shall be determined according to the Class 2 method of GB/T 3767 or GB/T 16404.2.If due to unsuitable environmental conditions, no If the above two standards can be used, it should be determined according to the 3-level method of GB/T 3768 or GB/T 16404.2.The test report shall state that the Reasons for measuring sound power levels with an accuracy class 2 method. For hand-held laser processing machines with remote components, the hand-held tool and remote components shall be tested separately. The sound power level of the hand tool should be It is determined by the reference body defined by the test layout (see Figure A.1) described in II in Table A.5.The measurement distance d of the parallelepiped measurement surface should be 1m. The operating position of the tester shall not impede the direct propagation of noise from the tool to any measurement microphone. For the determination of the sound power level of the component part, the measurement surface of the parallelepiped shall be used. A.2.2 Alternative methods for large laser processing machines For large-scale laser processing machines, the A-weighted emission sound pressure level of specified measurement points around the machine can be determined and declared instead of A-weighted sound power level. According to GB/T 3767, the measurement position should surround the equipment and be (1.55 ± 0.075) m above the ground or path level, and be away from the reference body 1m. The interval between measurement points should be such that the difference between the A-weighted emission sound pressure levels between adjacent points does not exceed 5dB. On each side of the machine should be at least Take a point to measure the emission sound pressure level, even if the mechanical emission noise is fairly uniform. Declares the maximum value measured by the application and should be recorded and report the measurement location used as the declared emission sound pressure level. Note. Some complex customized machines (such as with processing systems and integrated into complex production lines) are installed and operated at the customer site for the first time, and the noise emission value at this time is only Can be measured on site. For example, like a large laser processing machine with a large platform or a robotic laser machine. A.3 Assembly and installation conditions The laser machine or hand-held laser machine should be assembled and installed according to the manufacturer's instructions. If no installation conditions are specified or there are multiple Installation method, the installation method used when measuring the noise emission value should be specified in the test report. The laser processing machine usually installed on the ground should be placed on the horizontal reflective ground when measuring. The operator should follow the description in Table A.5 I way to hold a handheld tool. Relevant components (eg. laser system, power supply equipment, cooling device) should be placed on a reflective ground. When measuring the sound power level and emission sound pressure level, the assembly and installation conditions of the machine should be the same. It should be noted that any electrical connections, plumbing or air ducts connected to the machine should not significantly increase noise emissions. A.4 Operating Conditions Due to the existence of many different laser processing machines, the operating conditions vary widely, so it is not possible to specify standard criteria for noise emission measurements pieces. The operating conditions used for the measurement should therefore represent both the typical use of the equipment and the typical noisiest operation of the equipment. run bar The components shall be defined by the manufacturer and clearly described in the noise emission declaration. The technical aspects should comply with A.9. The operating conditions used to determine the emission sound pressure level and sound power level at the specified measurement location shall be identical. In order to specify a suitable operating condition, the following aspects should be considered. a) Processing area --- Laser operation type and parameters; ---Type and parameters of gas nozzle; ---Handheld system type and parameters. b) Laser equipment and components --- Cooling device type and operating parameters; ---Fan (power) type and operating parameters; --- Exhaust system type and operating system. The working cycle of the measurement should be clearly specified, and the measurement time should not be less than 15s. A.5 Measurement uncertainty The combined uncertainty of the noise emission value determined according to this part depends on the noise emission measurement method used (in the test, the The standard deviation σR0 given by the same radiation characteristics, different measuring instruments, and different measurement procedures), while the uncertainty is also related to the operating and The stability of the mounting conditions is related to σomc. The combined uncertainty result is calculated by formula (A.1). σtot= σ2R0 σ2omc (A.1) For the measurement method for determining the emission sound pressure level and sound power level, the upper limit of σR0 is about 1.5dB when the second level is adopted, and the upper limit of σR0 is about 1.5dB when the third level is adopted. The limit is about 3dB. For machines with fairly stable noise emissions, σomc can be used with 0.5dB. In other cases, such as when the material enters and leaves the machine, the impact is very large or the material When the material flow is unpredictable, it may be more appropriate to use 2dB for σomc. The method for determining σomc has been described in the basic measurement standard. The expanded measurement uncertainty U shall be calculated as U=kσtot, in decibels, where k is the inclusion factor. NOTE. The expanded measurement uncertainty depends on the required confidence level. To compare measurements at a certain limit, use the inclusion factor for a one-sided normal distribution as suitable. At this time, k=1.96, corresponding to the 95% confidence level. There is more relevant information in GB/T 14574.It should be noted that in GB/T 14574 The extended measurement uncertainty U is denoted by K. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 18490.3-2017_English be delivered?

Answer: Upon your order, we will start to translate GB/T 18490.3-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 18490.3-2017_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 18490.3-2017_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.