JB/T 51235-1999

This standard is used by agricultural machinery manufacturers, quality inspection agencies, and users to grade and evaluate the quality of stalk chopper and returning machines. It ensures product consistency and reliability by setting clear performance indicators such as chopping length, stubble height, and availability, along with safety requirements. This standard is important for regulating the market, improving product quality, and ensuring safety in agricultural operations.

该标准由农业机械制造商、质量检测机构和用户使用，用于对茎杆切碎还田机进行质量分等和等级评定。它通过设定明确的性能指标（如切碎长度、割茬高度、有效度）和安全要求，确保产品的一致性和可靠性。该标准对于规范市场、提升产品质量和保障农业作业安全具有重要意义。

This standard JB/T 51235-1999 specifies product quality grading requirements for stalk chopper and returning machines, including quality indicators, test methods, and inspection rules. Products are classified into qualified, first-class, and premium grades based on quality, with key indicators such as chopping length qualification rate (≥90%), stubble height (≤80mm), and availability (≥95%). The standard also covers safety performance, main components, and assembly quality requirements, including blade standards, spindle dynamic balance, and bearing temperature rise limits. Test methods reference relevant standards, and inspection rules adopt sampling plans. This standard applies to choppers primarily used for chopping corn stalks for quality inspection and grade evaluation.

本标准JB/T 51235-1999规定了茎杆切碎还田机的产品质量分等要求，包括质量指标、试验方法和检验规则。产品按质量分为合格品、一等品和优等品，关键指标包括切碎长度合格率（≥90%）、割茬高度（≤80mm）和有效度（≥95%）。标准还涉及安全性能、主要零部件和装配质量要求，如刀片标准、主轴动平衡和轴承温升限制。试验方法引用相关标准，检验规则采用抽样方案。该标准适用于以切碎玉米茎杆为主的还田机，用于质量检测和等级评定。