GB/T 25433-2024Safety requirements for rubber & plastics internal mixers (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 replaces GB 25433-2010 "Safety requirements for closed rubber mixing mills and plastic mixing mills". Compared with GB 25433-2010, except for the structural adjustment In addition to the integration and editorial changes, the main technical changes are as follows.

a) The scope of application of this document has been changed to include tandem internal mixers and laboratory internal mixers (see Chapter 1, 2010 Chapter 1 of the 2011 edition);

b) Added relevant safety requirements for "General Principles", "Start, Stop and Restart Functions" and "Control System Safety Related Components" (see 4.1 to 4.3);

c) Added major hazards of laboratory internal mixers and related safety requirements (see 4.4, 4.5.4.13, 4.5.4.14, 4.5.7.2.2, 4.7.1, 4.7.2, 6.2.5, 6.4, A.3.7);

d) Changed the following sections. "Emergency stop", "Mechanical hazards", "Hazards of hose assemblies for hydraulic, pneumatic and heating and cooling systems", "Large-scale cleaning operations".

Safety requirements for "additional hazards during operation, maintenance and repair" (see 4.4 to 4.7, 5.1, 5.8, 5.9 of the 2010 edition);

e) The safety requirements and protection measures for "electrical hazards" have been changed (see 4.8.1 to 4.8.5, 5.2 of the 2010 edition);

f) Changed the following categories. "Heat hazard", "Noise hazard", "Hazards caused by substances hazardous to health", "Fire hazard", "Hazards of slips, trips and falls".

Safety requirements and protective measures for "risk" (see 4.9~4.13, 5.3~5.7 of the 2010 edition);

g) Added "ergonomics" safety requirements and protective measures (see 4.14);

h) Changed the "Verification methods for safety requirements and/or risk protection/reduction measures" (see Chapter 5, Chapter 6 of the 2010 edition);

i) Added "General requirements" for "information for use" and "general requirements" for "instructions for use" (see 6.1, 6.2.1);

j) Changed the terms "installation", "operation" and "noise" in the instruction manual (see 6.2.2, 6.2.3, 6.2.5, 7.1.1, 7.1.2, 7.1.4);

k) Changed "Cleaning operations and maintenance" and "Marking" in the information for use (see 6.2.4, 6.3, 7.1.3, 7.2 of the 2010 edition);

l) Added "Fire hazard emergency procedures information" in the instruction manual (see 6.2.6);

m) Added "Warning signals and warning signs" in the usage information (see 6.4);

n) The "Hazard List" has been changed (see Appendix A, Chapter 4 of the 2010 edition);

o) Added the normative appendix "Test Procedure for Noise of Internal Mixers for Laboratory Use" (see Appendix B).

Introduction

According to the classification of GB/T 15706, this document belongs to Class C standard.

This document is particularly relevant to the following stakeholders involved in machinery safety.

---Machine manufacturer;

---Health and safety agencies.

Other stakeholders affected by the level of machinery safety are.

---Machine users;

---Machine owner;

---Service providers;

--- Consumer (when the machine is intended for use by a consumer).

All of the above stakeholders may participate in the drafting of this document.

The machines involved and the range of hazards, hazardous situations and hazardous events covered are given in the scope of this document.

When the requirements of this document differ from those in Category A or Category B standards, for machines designed and manufactured in accordance with this document, For devices, the requirements of this document take precedence over those in other standards.

1 Scope

This document specifies the safety requirements for the design and manufacture of closed rubber and plastic mixing mills (hereinafter referred to as "internal mixers") and gives the machine safety Instructions for use.

This document is applicable to the treatment of the internal mixer during its life cycle (5.4 in GB/T 15706-2012).

All significant hazards, hazardous conditions and hazardous events associated with the internal mixer that could result from misuse that could be reasonably foreseeable by the manufacturer (see Appendix A).

This document specifies the requirements for the measurement and declaration of noise emissions from internal mixers for laboratory use only.

This document applies to the following internal mixers.

--- Production internal mixers and tandem internal mixers with manual feeding starting from the charging door and ending at the lower edge of the material discharge port;

--- Automatic feeding of production internal mixers and tandem internal mixers starting from the conveyor integrated in the equipment and ending at the lower edge of the material discharge port Refining machine;

--- Laboratory internal mixer starting from the charging door and ending at the material container integrated in the internal mixer.

This document does not include.

--- Risk of explosion during material processing;

--- Requirements for equipment and protection systems used in potentially explosive atmospheres;

---Design requirements for exhaust ventilation systems.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document.

GB/T 3766 General rules and safety requirements for hydraulic transmission systems and their components

GB/T 3767 Acoustics - Determination of sound power level and sound energy level of noise source by sound pressure method - Engineering method for approximate free field above reflecting surface

GB/T 3768 Acoustics Sound Pressure Method for Determination of Sound Power Level and Sound Energy Level of Noise Source Using a Simple Measurement of the Envelope Measurement Surface Above the Reflecting Surface Easy Method

GB/T 4208-2017 Enclosure protection degree (IP code)

GB/T 5226.1-2019 Electrical safety of machinery Electrical equipment of machinery Part 1: General technical requirements

GB/T 7932 General rules and safety requirements for pneumatic systems and their components

GB/T 8196-2018 Mechanical safety guards General requirements for the design and manufacture of fixed and movable guards

GB 12158 General Guidelines for Preventing Electrostatic Accidents

GB/T 14574 Labeling and verification of noise emission values of acoustic machines and equipment

GB/T 15706-2012 General principles for safety design of machinery - Risk assessment and risk reduction

GB/T 16251 Ergonomic principles for work system design

GB/T 16404.2 Acoustics - Determination of sound power level of noise source by sound intensity method - Part 2: Scanning measurement

GB/T 16538 Acoustics Sound Pressure Method for Determination of Sound Power Level of Noise Sources - Field Comparison Method

GB/T 16754 Design principles for mechanical safety emergency stop function