JB/T 53549-1999

Manufacturers of rotary probability screens use this standard to classify and evaluate the quality grades of their products, ensuring they meet requirements for qualified, first-class, or premium levels. Quality inspectors and customers rely on this standard for final product inspection and acceptance to determine if the product meets expected performance. By specifying pass rates for critical and major items, this standard provides a unified basis for quality control, helping to raise the overall industry level.

旋转概率筛的制造商使用本标准来划分和评定其产品的质量等级，确保产品达到合格品、一等品或优等品的要求。质检人员和用户依据本标准进行成品检验和验收，以判断产品是否符合预期性能。该标准通过明确关键项目和主要项目的合格率，为产品质量控制提供了统一依据，有助于提升行业整体水平。

This standard specifies the quality grades (qualified, first-class, premium), test methods, and inspection rules for rotary probability screen products. The quality grade is determined based on product standards, technical level, finished product inspection, production quality checks, and user feedback. It details pass rate requirements for finished product inspection items (e.g., overall performance, component performance, reliability and life) and assembly, painting, and packaging quality inspection items. The pass rates of critical and major items are core indicators for grading. Test methods cover speed, temperature, noise, etc., and inspection rules define sampling and judgment procedures.

本标准规定了旋转概率筛产品的质量等级（合格品、一等品、优等品）、试验方法和检验规则。质量等级依据产品标准、技术水平、成品检验、生产过程质量检查和用户评价综合确定。标准详细列出了成品检验项目（如整机性能、部件性能、可靠性与寿命等）的合格率要求，以及装配、涂漆和包装质量检验项目。关键项目和主要项目的合格率是划分等级的核心指标。试验方法包括转速、温度、噪声等测试，检验规则规定了抽样方法和判定规则。