GB/T 9239.23-2022Mechanical vibration - Rotor balancing - Part 23: Enclosures and other protective measures for the measuring station of balancing machines (English PDF)

foreword

This 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.

Introduction

GB/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 machine

1 Scope

This 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 references

The 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 Definitions

The terms and definitions defined in ISO 21940-2 apply to this document.

4 List of major hazards