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老课件新读|Part3 如何采样——商品煤人工+机械化采样作业流程

  • 2026-06-22 20:59:17
老课件新读|Part3 如何采样——商品煤人工+机械化采样作业流程

采样是煤质检测的“第一道关口”,采、制、化总误差中,采样误差约占 80%。

采样不具备代表性,再精准的化验结果也毫无意义。

采样方案已制定完成(明确采样对象、采样点、采样单元、采样量、采样频次、检测项目、保存方式及判定规则)。

今天只讲一件事:方案定了,现场到底怎么采?

一、采样前准备

1. 核对采样方案

  • 采样点位/单元编号、方位或位置

  • 每个点的样品数量、代表量

  • 检验项目(是否需密封包存,如全水)

2. 工具与材料

  • 人工采样工具:采样铲等(材质不与样品反应,易清洗)

  • 机械采样设备:自动采样器、皮带采样机、分样器等,提前试运行

  • 包装容器:洁净塑料袋、带衬编织袋等

  • 记录用品:取样单、样品标签(唯一编号)、记号笔、相机等

3. 人员与安全防护

  • 掌握采样方法,有授权上岗

  • 穿戴相应劳保防护用品(手套、口罩、工作服、安全帽等)

  • 了解现场安全注意事项(运转设备、高空、有限空间等)

二、人工采样

操作要点

  1. 确定采样部位

    散装物料(如堆场、车厢):不同深度、不同部位(上、中、下、四角+中心)多点取样。

  2. 逐点采集

    用洁净工具取近似等量样品。

  3. 混合缩分(如需)

    合并各点样品 → 混匀 → 四分法或其他法定缩分方式 → 得到实验室样品。

    (注:现场多采用堆锥四分法,但现在实验室一般用二分器)

  4. 装袋/装瓶、加标签

    立即密封,标明:样品编号、点位、日期、批次、采样人。

  5. 填写采样记录

    采样时间、天气/样品状态(含水、结块等)、异常情况。

人工采样关键:随机多点、避免只取表面或死角、工具清洁、不交叉污染。

三、机械化采样(机械/自动采样)

1. 采样器要求

其开口尺寸应不小于被采样煤标称最大粒度的 3倍,且不小于 30mm

2. 采样机类型

  • 皮带采样机:皮带端部采样机和皮带中部采样机。

  • 静止煤采样机:适用于火车载煤和汽车载煤。

    (注:不同类型煤炭采样机系统的在线制样分系统结构基本相同。)

3. 全系统基本要求

a)能无实质性偏倚地收集子样并被权威性的试验所证明;

b)能在规定条件下保持工作能力。

  • 采样头(切割器)能截取全断面或规定比例的代表性样品。

  • 采样频率、单次截取量符合采样方案(通常按时间间隔或质量间隔)。

  • 设备不引起显著粒度偏析或水分损失。

4. 采样前检查

  • 确认机械设备处于正常状态(切割口无堵塞、皮带速度正常)。

  • 按方案设定:采样间隔时间 / 采样质量间隔、总子样数、单子样质量。

  • 准备好后续缩分、破碎、混匀装置(如在线二分器)。

5. 机械采样运行

启动自动采样程序,按设定采集若干子样 → 子样汇集成原始总样 → 经机械缩分 → 得实验室样品。(若需手工再缩分,须按标准方法如二分器法等)

6. 收集、包装、标识

同人工采样要求:洁净容器、唯一标签、及时封存。

记录:机械型号/编号、设定参数(时间间隔、截取次数)、起止时间、异常停机情况。

⚠️ 注意事项

  • 机械采样不能代替人工校验,定期核查采样代表性。

  • 皮带采样需注意切割方向与物料流向垂直、切割速度足够快,防止偏析。

  • 易失水物料如全水,注意密闭与检测时效。

四、采样后共同要求

✅ 样品妥善保存(依检测项目)

✅ 样品在规定时间内送至实验室

✅ 采样原始记录与样品同步归档

✅ 现场拍照留证(必要时)

五、简要对比小结

项目人工采样机械化采样
适用批量小、散堆、不便机械化场合连续生产、大宗物料、流水线
代表手段多点随机取样+缩分等时/等质量间隔全断面截取子样
关键控制取点位置、工具清洁、混匀缩分切割器参数、截取频率、防偏析
记录重点点位、数量、感官描述设备参数、子样数、运行时段

采样是“源头活水”,制样和化验只是“锦上添花”。

严格按方案执行,拒绝“拍脑袋采样”,才是质量控制的核心。

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  1. CONNECT:[ UseTime:0.000992s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001775s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000918s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000696s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001429s ]
  6. SELECT * FROM `set` [ RunTime:0.000531s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001546s ]
  8. SELECT * FROM `article` WHERE `id` = 513379 LIMIT 1 [ RunTime:0.003467s ]
  9. UPDATE `article` SET `lasttime` = 1782175674 WHERE `id` = 513379 [ RunTime:0.003743s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000613s ]
  11. SELECT * FROM `article` WHERE `id` < 513379 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001225s ]
  12. SELECT * FROM `article` WHERE `id` > 513379 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001271s ]
  13. SELECT * FROM `article` WHERE `id` < 513379 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011057s ]
  14. SELECT * FROM `article` WHERE `id` < 513379 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006644s ]
  15. SELECT * FROM `article` WHERE `id` < 513379 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003278s ]
0.206320s