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Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 9239.23-2022: Mechanical vibration - Rotor balancing - Part 23: Enclosures and other protective measures for the measuring station of balancing machines Status: Valid
Basic dataStandard ID: GB/T 9239.23-2022 (GB/T9239.23-2022)Description (Translated English): Mechanical vibration - Rotor balancing - Part 23: Enclosures and other protective measures for the measuring station of balancing machines Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: N73 Classification of International Standard: 21.120.40 Word Count Estimation: 26,298 Date of Issue: 2022-10-12 Date of Implementation: 2023-05-01 Older Standard (superseded by this standard): GB/T 12977-2008 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 9239.23-2022: Mechanical vibration - Rotor balancing - Part 23: Enclosures and other protective measures for the measuring station 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 23.Enclosures and other protective measures for the measuring station of balancing machines ICS 21.120.40 CCSN73 National Standards of People's Republic of China Replacing GB/T 12977-2008 Mechanical Vibration Rotor Balancing Part 23. Protective covers and other protective measures for the measuring station of the balancing machine Mechanical vibration-Rotorbalancing-Part 23.Enclosures and others (ISO 21940-23.2012, IDT) Released on 2022-10-12 2023-05-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee table of contentsPreface I Introduction II 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Significant hazard list 1 4.1 Overview 1 4.2 Risk assessment 1 4.3 Risks of access to balancing machines1 5 Safety requirements and protective measures 3 5.1 General requirements 3 5.2 Specific requirements 5 6 Inspection of safety requirements and protective measures 5 7 Usage information 8 7.1 General requirements 8 7.2 Instruction manual 8 7.3 Identification 8 Appendix A (Normative) Selection of Class C Protective Covers 10 Appendix B (informative) Impact test device 16 Appendix C (informative) protection level example 17 Reference 20forewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. This document is part 23 of GB/T 9239 "Rotor Balance for Mechanical Vibration". GB/T 9239 has issued the following parts. --- Part 12.Balancing methods and tolerances for rotors with flexible characteristics; --- Part 14.Evaluation procedures for balance errors; --- Part 21.Description and evaluation of balancing machines; --- Part 23.Protective covers and other protective measures for the measuring station of the balancing machine; --- Part 32.Key criteria for shaft and mating balance. This document replaces GB/T 12977-2008 "Balancer protective cover and other protective measures for measuring stations", and GB/T 12977- Compared with.2008, except for structural adjustment and editorial changes, the main technical changes are as follows. --- Changed the terms and definitions guideline reference document, changed "GB/T 6444 and GB/T 2298" to "ISO 21940-2" (see Chapter 3, Chapter 3 of GB/T 12977-2008); --- "Excessive vibration" has been added to the category of mechanical hazards (see item 1.7 in Table 1); --- Change "many rotors during balancing" to "all rotors during balancing" (see 5.1.2, 5.1.2 of GB/T 12977-2008); --- Changed the requirements for the rotor, adding "possibility of no winding" [see 5.1.2a), GB/T 12977-2008 on the basis of the original 5.1.2a)]; --- Changed the protection level, deleted level 0, and retained the four protection levels A, B, C and D (see Table 2, GB/T 12977-2008 table 2); ---Change "thrust device should prevent" to "thrust device should prevent" (see item 1.2 of Table 3, Table 3 of GB/T 12977-2008 Item 1.2); ---Change "has been classified as level 0 protection" to "has been classified as level A protection" (see item 1.4 of Table 3, GB/T 12977-2008 Item 1.4 of Table 3); --- Change "qualified energy per unit area" to "qualified penetration strength" (see Table A.2, Table A.2 of GB/T 12977-2008). This document is equivalent to ISO 21940-23.2012 "Mechanical Vibration Rotor Balancing Part 23.Protective cover for the measuring station of the balancing machine and other protective measures". The following minimal editorial changes have been made to this document. --- Added a reference to informative Appendix B in the text (see 5.1.3); --- A reference to informative Appendix C has been added to the text (see 5.1.4). Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Testing Machine Standardization Technical Committee (SAC/TC122). This document is drafted by. China Machine Test Equipment Co., Ltd., Shanghai Schenck Machinery Co., Ltd., China Aviation Development Beijing Aeronautical Materials Research Institute Research Institute, Xiaogan Pine Forest International Measuring Instrument Co., Ltd., China Machine Testing Co., Ltd. The main drafters of this document. Sun Baorui, Sun Huagang, Bai Mingyuan, Zhang Shimin, Jin Hongbo. The release status of previous versions of this document and the documents it replaces are as follows. ---In.1991, it was first published as GB 12977-1991 "Balancer Guards and Other Safety Measures", and it was revised for the first time in.2008 It will be converted into a recommended national standard in.2017;IntroductionGB/T 9239 "Mechanical Vibration Rotor Balancing" aims to standardize the general basis, test methods, key parameter evaluation criteria, and evaluation of balancing machines. Regulations and safety protection, etc., are proposed to be composed of the following parts. --- Part 1.Application Guidelines 1). The purpose is to establish the application basis of the balancing machine. --- Part 2.Vocabulary 2). The purpose is to standardize the vocabulary of balancing machines. --- Part 11.Balancing methods and tolerances for rigid rotors 3). The purpose is to determine the tolerances of the balancing method for rigid rotors. --- Part 12.Balance methods and tolerances for rotors with flexible characteristics. The balancing method of the rotor for the purpose of determining the flexibility characteristics Laws and Tolerances. --- Part 13.medium and large rotor site balancing guidelines and safety protection 4). The purpose is to give medium and large rotors on-site Balance guidelines and safety precautions. --- Part 14.Evaluation procedures for balance errors. The purpose is to standardize the evaluation procedure of balance error. --- Part 21.Description and evaluation of balancing machines. The purpose is to standardize the description and evaluation methods of balancing machines. --- Part 23.Shields and other protective measures for the measuring station of the balancing machine. The purpose is to standardize the protection of the measuring station of the balancing machine Covers and other protective measures. --- Part 31.Machine imbalance sensitivity and imbalance sensitivity 5). The purpose is to determine the imbalance sensitivity and imbalance sensitivity. --- Part 32.Key criteria for shaft and mating balance. The purpose is to determine the key criteria for shaft and mating balance. Although the designers, manufacturers and users of balancing machines have tried their best to minimize the dangers arising from the use of balancing machines themselves, Yes, it is more necessary to strengthen the safety of the work site, especially for the protection of the rotor to be balanced. Operator or workshop work area of a balancing machine There may be potential hazards around the area, such as. rotor parts or unbalance correction mass flying off when people touch the balancing machine parts or rotor When the rotor jumps or breaks from the support frame. 1) It is proposed to revise GB/T 29714-2013 "Guidelines for the Use and Application of Mechanical Vibration Balance and Balance Standards". 2) It is proposed to revise GB/T 6444-2008 "Mechanical Vibration Balance Vocabulary". 3) It is proposed to revise GB/T 9239.1-2006 "Mechanical Vibration Constant (Rigid) Rotor Balance Quality Requirements Part 1.Specification and Inspection of Balance Tolerance". 4) It is proposed to revise GB/T 28785-2012 "Criteria and protection for on-site balancing of large and medium-sized rotors with mechanical vibration". 5) It is proposed to revise GB/T 19874-2005 "Mechanical Vibration Machine Unbalance Sensitivity and Unbalance Sensitivity". Dedicated balancing machines, such as those used in mass production in the automotive industry, usually include all necessary protection measures This method can be considered by the manufacturer of the balancing machine because the workpiece and the working conditions of the balancing machine are known. However, for the general balance The manufacturer of the balancing machine is usually unknown to the workpiece to be balanced, so it is difficult to control it, and the basic protection measures are limited to obvious hazards, e.g. shaft end drives or endless belt drives. However, the balancing machine manufacturer must provide sufficient information to allow the user to evaluate the balance Hazards that may arise from the rotors in the machine and the intended use of the balancing machine. In conjunction with this information, balancing machine users must state that their rotors may The dangers generated, so that the manufacturer of the balancing machine can provide equivalent protective measures, or the user can independently equip protective measures that meet the requirements. For rotors that are unknown in advance, a good evaluation is required, e.g. using balancing machines in balancing services and repairs. Table A.2 Typical values are indicated for different sized balancing machines. It is up to the user to check that the protective measures for each type of rotor to be balanced protect all Danger. The requirements recommended in this document are usually provided to provide appropriate protection measures for the operator of the balancing machine and the staff on the workshop site. apply. However, there are applications where recommended guards or other protective measures may be expensive or time-consuming to apply, requiring Take other protective measures, such as clearing the area of sufficient distance, remote-controlling balancing equipment, or working at unusual hours. If it is necessary to balance the rotor at the operating speed or to carry out the rotation test at or above its operating speed, the accident shall be considered. The probability of occurrence may be important (this situation is just as the low-speed balancing process needs to consider that the rotor will have a larger accident), than the low-speed balancing process The danger caused by the damage of the main rotor needs to be considered. On the other hand, a rotor balanced at low speeds can be assembled from several parts, such as a turbine wheel. At this point it is important to consider Consider whether the shroud used for low speed balancing will withstand penetration by a flying turbine blade, or whether it will be adequate to Unbalance correcting mass that can fly out. If the probability of the blade coming off is almost non-existent, only use a lightweight A shield will suffice. This document provides an overview of balancing machines and protective measures, and fails to describe the details of risks for specific rotor types and balancing machines. need in the future In each special case, a special study is carried out based on the actual rotor parameters. As such, the risk analysis of possible accidents includes the average The characteristics of the weighing machine itself. As for the degree of subsequent damage, it is very important to know how much damage by the rotor part can be survived by the balancing machine support frame and bearings. Unbalances caused by accidents can be decisive, eg rotor parts flying off during operation. The significant hazards addressed in this document are those listed in Chapter 4.Chapter 5 gives instructions for preventing or reducing the hazards identified in Table 1. And the specified safety requirements and protective measures, Chapter 6 gives the procedures for verifying these requirements and protective measures. Mechanical Vibration Rotor Balancing Part 23. Protective covers and other protective measures for the measuring station of the balancing machine1 ScopeThis document specifies requirements for protective coverings and other protective measures. The protective cover and protective measures are used to reduce the centrifugal (rotary) flat Mechanical hazards arising from an unbalanced rotor at the measuring station of a weighing machine. These hazards are in balancing various types of rotors and operating in different states of balance generated when balancing the machine. This document defines different levels of protection for shields and other protective measures, and defines the requirements for each level of protection. scope of application. This document does not include means for adjusting the mass distribution of the rotor and means for conveying the rotor, although some of them are assembled on the measuring station. This document does not cover special properties of the enclosure, such as noise reduction, windage reduction or vacuuming (balancing bladed blades at equilibrium speed). rotors may have these requirements).2 Normative referencesThe contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. Part 2.Vocabulary) ISO 4849 Personal eye protection specifications (Personaleye-protectors-Specifications)3 Terms and DefinitionsThe terms and definitions defined in ISO 21940-2 apply to this document.4 List of major hazards4.1 Overview Table 1 lists the significant hazards identified at the measuring station of a centrifugal (rotary) balancing machine together with the associated hazardous states, activities and Example of a danger zone. 4.2 Risk assessment A risk assessment should be performed by the users of this document (ie balancing machine users, designers, manufacturers and suppliers). as a risk assessment In part, users of this document shall describe the intended use of the balancing machine, including manual tool loading, workpiece installation, maintenance, repair and cleaning, and and foreseeable misuse of the balancing machine. As another part of the risk assessment, users of this document should also verify that the hazard list in Table 1 is appropriate. for the balancing machine under consideration. 4.3 Risks of approaching the balancing machine The risk assessment should assume that the balancing machine is approached from all directions. Both the operator and other persons who may enter the danger zone shall be identified ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 9239.23-2022_English be delivered?Answer: Upon your order, we will start to translate GB/T 9239.23-2022_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 9239.23-2022_English with my colleagues?Answer: Yes. 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