BS ISO 7448:2024 - Machinery for forestry. Machine-fed woody biomass reduction chippers, grinders, and shredders. Vocabulary

Standard No.: BS ISO 7448:2024
Release Date: 2024
Published By: British Standards Institution (BSI) GB / BSI
Latest: BS ISO 7448:2024

Introduction

Analysis of the core content of the standard

This standard systematically standardizes the terminology system of mechanically fed wood crushing equipment for the first time, mainly including the following technical categories:

Equipment type	Working principle	Typical configuration	Processing capacity
Chipper (3.2.1)	Cutting by rotating knife disc/drum	Self-propelled/trailer/stationary	Whole tree or trunk part
Grinding machine (3.2.2)	Hammer/shear crushing	Horizontal/drum type	Branches/shrubs
Shredder (3.2.3)	Multi-axis shredder	Mainly self-propelled	Mixed wood materials

Key technical elements

1. Cutting system definition

The standard clearly defines three types of core components:
• Cutting element (3.3.4): includes three designs: drum, disc and spiral
• Anvil block (3.3.7): fixed reaction component, cooperates with the moving knife to complete the cutting
• Screen (3.3.8): Key components for controlling the particle size of the output material

2. Dimensional characteristics specifications

Establish a unified measurement system, including:
• Working state dimensions (H1/L1/W1)
• Transportation state dimensions (H2/L2/W2)
• Feed port parameters (W3/H3/H4)
• Handling system diameter (3.7.1-3.7.3)

Standard implementation recommendations

Equipment selection and application

According to the graphical parameters in Appendix A/B:
1. For large-scale forestry operations, it is advisable to use a self-propelled drum chipper (Figure A.15)
2. Recommended for biomass power plants: fixed spiral chipper (Figure A.17)
3. Suitable for urban garden waste treatment: horizontal grinder (Figure B.5)

Key points for safe operation

• Metal separators (3.6.3) must be inspected regularly
• Feed height H4 needs to match loading equipment
• Power source configuration (3.8.2) affects mobility

Technology evolution analysis

Main breakthroughs of this standard compared with the previous version:
1. Added classification definition of shredder
2. Refined power source classification (dedicated/combined/external)
3. Introduced safety component terms such as metal separator
4. Standardized 22 key dimensional parameters

BS ISO 7448:2024 history

2024 BS ISO 7448:2024 Machinery for forestry. Machine-fed woody biomass reduction chippers, grinders, and shredders. Vocabulary

Machinery for forestry. Machine-fed woody biomass reduction chippers, grinders, and shredders. Vocabulary

BS ISO 7448:2024Machinery for forestry. Machine-fed woody biomass reduction chippers, grinders, and shredders. Vocabulary