GB7681-2008
Safety technical requirements for choppers
铡草机 安全技术要求
GB 7681-2008 is a current mandatory Chinese national standard for Safety technical requirements for choppers. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Oct 1, 2009.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard specifies the safety technical requirements for the design, manufacturing, and use of agricultural choppers. It is specifically applicable to disc choppers and drum choppers used in agricultural processing. Engineers must ensure their products fall into these specific categories to comply with this mandatory standard. It replaces the previous version GB 7681-1997 and introduces updated requirements for feed rollers and cutter wheels.
Technical requirements
The standard outlines comprehensive safety design requirements to prevent operational hazards. It mandates that all rotating components and feed openings must be equipped with firm and reliable protective devices. Manufacturers must ensure that feed rollers and protective covers meet specific horizontal distance criteria based on the machine's production capacity. Additionally, machines with a production rate exceeding 2.5t/h must be equipped with an automatic feed mechanism and an overload protection device. For structural integrity, the standard specifies requirements for the upper machine casing, which must feature a reliable locking device. The fasteners used for moving and fixed blades must meet specific mechanical property grades, referencing GB/T 3098.1 and GB/T 3098.2, and must include reliable anti-loosening mechanisms. It is mandatory that cutter wheels are free from casting defects such as cracks and blowholes. The standard also details manufacturing and acceptance criteria, requiring prominent safety signs on the machine casing and feed opening guards, in accordance with GB 10396. Furthermore, it provides extensive safety use requirements that must be detailed in the user manual, covering pre-operation checks, workplace safety, and operator qualifications.
Testing methods
The standard requires specific testing and evaluation procedures to ensure compliance. Key methods include balance inspection for the assembled cutter wheel (excluding blades), which must achieve a balance quality grade of G16 as per GB/T 9239.1. Additionally, the informative annex outlines a method for determining the tightening torque of blade fasteners, requiring the use of a torque wrench to measure the force needed to return a loosened bolt to its marked position. Manufacturers must verify these parameters during the acceptance phase.
FAQs
What products are regulated under GB 7681-2008?
This standard regulates the safety technical requirements for disc choppers and drum choppers used in agricultural applications.
Are there any updates from the previous version of GB 7681?
Yes, compared to GB 7681-1997, this version updates the normative references, adjusts the horizontal distance requirements between feed rollers and feed opening guards, and adds specific requirements for the cutter wheel.
Is GB 7681-2008 a mandatory standard?
Yes, all technical content within this standard is mandatory for applicable chopper manufacturers.
The summary above provides a high-level overview of GB 7681-2008. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 7681-2008 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Safety
- CCS
- B92
- ICS
- 65.060.99
- Competent department
- Ministry of Industry and Information Technology
- Technical committee
- Ministry of Industry and Information Technology
Relationships
Replaces:GB 7681-1997