GB/T 9239.21-2019 English PDFUS$1024.00 ยท In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 9239.21-2019: Mechanical vibration -- Rotor balancing -- Part 21: Description and evaluation of balancing machines Status: Valid
Basic dataStandard ID: GB/T 9239.21-2019 (GB/T9239.21-2019)Description (Translated English): Mechanical vibration -- Rotor balancing -- Part 21: Description and evaluation of balancing machines Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: N73 Classification of International Standard: 21.120.40 Word Count Estimation: 54,550 Date of Issue: 2019-10-18 Date of Implementation: 2020-05-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 9239.21-2019: Mechanical vibration -- Rotor balancing -- Part 21: Description and evaluation of balancing machines---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. Mechanical vibration--Rotor balancing--Part 21. Description and evaluation of balancing machines ICS 21.120.40 N73 National Standards of People's Republic of China Replace GB/T 4201-2006 Mechanical vibration rotor balance Part 21. Description and assessment of balancing machines Part 21. Descriptionandevaluationofbalancingmachines (ISO 21940-21.2012, IDT) Published on.2019-10-18 2020-05-01 implementation State market supervision and administration China National Standardization Administration issued ContentForeword III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Balancer capacity and performance data 1 4.1 General requirements 1 4.2 Horizontal Balancer Data 1 4.3 Vertical Balancer Data 5 5 balance machine performance 8 5.1 Working principle 8 5.2 Balancer structure 8 5.3 indicator system 9 5.4 Plane separation system 9 5.5 Setting and Calibration of Indicators 10 5.6 Other devices 10 6 Minimum reachable residual unbalance amount 10 7 Productivity 11 7.1 Overview 11 7.2 Each measurement run time 11 7.3 Unbalance reduction rate 11 8 Performance Limits 11 9 Installation requirements 12 9.1 General 12 9.2 Power and Power Requirements 12 9.3 Foundation 12 10 Verifying the rotor and test quality 12 10.1 Overview 12 10.2 Verifying the rotor 12 10.3 Test quality 14 11 verification test 22 11.1 Requirements for performance and parameter verification 22 11.2 Responsibilities of Manufacturers and Users 23 11.3 Requirements for weighing balances 23 11.4 Detection and re-inspection 23 11.5 Test speed 23 11.6 Minimum reachable residual unbalance detection, Umar 23 11.7 Unbalance reduction rate detection, URR 29 11.8 Single-sided balancing couples unbalanced interference detection 32 11.9 Compensator detection 32 11.10 Simplified Testing 33 Appendix A (informative) Relevant information provided by the user to the balancing machine manufacturer 37 Appendix B (informative) URR limit diagram 41 Appendix C (informative) A support shaft 44 that forms a C-type external centroid check rotor Appendix D (informative) The old-fashioned verification rotor 46 according to the original national standard is modified according to this part. Reference 47ForewordGB/T 9239 "Mechanical Vibration Rotor Balance" plan is divided into the following parts. --- Part 1. Introduction 1); --- Part 2. Vocabulary 2); --- Part 11. Balance method and tolerance for rigid rotors 3); --- Part 12. Balance method and tolerance for flexible rotors 4); --- Part 13. Medium and large rotor field balance criteria and safety protection 5); --- Part 14. Method for assessing the balance error 6); --- Part 21. Description and assessment of balancing machines 7); --- Part 23. Balancing machine shields and other protective measures for measuring stations 8); --- Part 31. Machine imbalance sensitivity and unbalance sensitivity 9); --- Part 32. Balanced key criteria for shafts and fittings 10). This part is part 21 of GB/T 9239. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 4201-2006 "Description and Inspection of Balancer". 1) Revised GB/T 29714-2013 "Guidelines for the Use and Application of Mechanical Vibration Balance Balance Standards". 2) Revised GB/T 6444-2008 "Mechanical Vibration Balance Vocabulary". 3) Revised GB/T 9239.1-2006 "Mechanical vibration constant state (rigid) rotor balance quality requirements Part 1. Specification and balance tolerance test". 4) Revised GB/T 6557-2009 "Mechanical Vibration Flexible Rotor Mechanical Balance Method and Guidelines". 5) Revise GB/T 28785-2012 "Guidelines and protection of on-site balance of large and medium-sized rotors for mechanical vibrations". 6) Revised GB/T 9239.2-2006 "Balance quality requirements for mechanically vibrating rigid rotors - Part 2. Balanced error". 7) Revised GB/T 4201-2006 "Description and Inspection of Balancer". 8) Revised GB/T 12977-2008 "Other protective measures for balancing machine guards and measuring stations". 9) Revised GB/T 19874-2005 "Mechanical vibration machine imbalance sensitivity and unbalance sensitivity". 10) Revised GB/T 16908-1997 "Key Guidelines for the Balance of Mechanical Vibration Shafts and Mating Parts". Compared with GB/T 4201-2006, the main technical changes in this section are as follows. --- Modified the standard name and standard number; ---Modified the partial parameters of the C-type external centroid check rotor of the horizontal balance machine (see Table 5, Table 5 of the.2006 edition); --- Modified the parameters of the support shaft of the C-type external centroid check rotor of the horizontal balancer (see Table C.1, Table C.1 of the.2006 edition). This section uses the translation method equivalent to ISO 21940-21.2012 "Mechanical Vibration Rotor Balance Part 21. Description of Balancer And assessment. The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. ---GB/T 6444-2008 Mechanical vibration balance vocabulary (ISO 1925.2001, IDT). This part was proposed by the China Machinery Industry Federation. This part is under the jurisdiction of the National Testing Machine Standardization Technical Committee (SAC/TC122). This section drafted by. Shanghai Shenke Machinery Co., Ltd., China Machine Testing Equipment Co., Ltd., Xiaogan Pine Forest International Measuring Instrument Co., Ltd. Company, Shanghai Hengwang Intelligent Technology Co., Ltd., Shenzhen Huajian Testing Co., Ltd., Shanghai Shenlian Testing Machine Co., Ltd., Zhengzhou Machinery Research Institute Research institute. The main drafters of this section. Sun Huagang, Zhang Jinwei, Zhang Shimin, Guo Qiang, Shu Zongyi, Li Peng, Huang Runhua. The previous versions of the standards replaced by this section are. ---GB/T 4201-1984, GB/T 4201-2006; ---GB/T 7662-1987. Mechanical vibration rotor balance Part 21. Description and assessment of balancing machines1 ScopeThis part of GB/T 9239 specifies the requirements for the performance of balancing machines for balancing rotating parts by the following tests. a) minimum reachable residual unbalance test, Umar test; b) Unbalance reduction rate test, URR test; c) single-sided balancing couple unbalanced interference test; d) Compensator test. These tests are carried out during and after the acceptance checker to ensure that the balancer can be used for actual balancing. operation. Simplified testing procedures are specified for periodic testing. This section does not specify tests for other capabilities and performance parameters of the balancing machine. Three types of special calibration rotors are specified in these tests and are suitable for most vertical and horizontal balancing machines. Attached The recommended method of remodeling the old-fashioned verification rotor as specified in the original national standard is described. In addition, this section highlights the importance of manufacturers in developing a format for balancing machine features. Use this specified format to enable users to be different Manufacturer's products are compared. In addition, in the appendix, a guide to information provided by the user to the manufacturer for data and requirements is given. This section applies to a balancing machine that supports the rotor and rotates the rotor in a rigid state at equilibrium speed and can be in one or more flat The surface can indicate the magnitude and phase angle at which the imbalance correction is required. Therefore, it is suitable for rigid rotors and rotors with elastic shafts. Balance according to the low speed balance program. It covers soft support balancers and hard support balancers. This section also includes technical requirements for the above balancing machine. Seeking, but not including those special features related to automatic correction. This section does not specify a balancing criterion that is specified in ISO 1940-1 and ISO 11342 (only applicable to low speed balancing procedures).2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. ISO 1925 Mechanical vibration balance vocabulary (Mechanicalvibration-Balancing-Vocabulary)3 Terms and definitionsThe terms and definitions defined in ISO 1925 apply to this document.4 Balancer capacity and performance data4.1 General requirements The manufacturer shall provide data suitable for horizontal balancing machines or vertical balancing machines in accordance with 4.2 or 4.3. Note. See Appendix A for a summary of the information provided by the user to the balancer manufacturer. 4.2 Horizontal Balancer Data 4.2.1 Rotor mass and unbalance limit 4.2.1.1 The maximum mass m of the rotor that can be balanced shall be specified within the range of the balancing speed (n1, n2) of the balancing machine. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 9239.21-2019_English be delivered?Answer: Upon your order, we will start to translate GB/T 9239.21-2019_English as soon as possible, and keep you informed of the progress. 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