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冷拉机

钢筋加工机械之一。利用超过屈服点的应力,在一定限度内将钢筋拉伸,从而使钢筋的屈服点提高20~25%。
冷拉机分卷扬冷拉机和阻力冷拉机。卷扬冷拉机用卷扬机通过滑轮组,将钢筋拉伸。冷拉速度在5米/分左右,可拉粗、细钢筋,但占地面积较大。
阻力冷拉机用于直径 8毫米以下盘条钢筋的拉伸。钢筋由卷筒强力牵行通过4~6个阻力轮而拉伸,该机可与钢筋调直切断机组合,直接加工出定长的冷拉钢筋,冷拉速度为40米/分左右,效率高,布置紧凑。

2冷拉机操作安全要求

(1)应根据冷拉钢筋的直径,合理选用卷扬机。卷扬钢丝绳应经封闭式导向滑轮并和被拉钢筋水平方向成直角。卷扬机的位置应使操作人员能见到全部冷拉场地,卷扬机与冷拉中线距离不得少于5m。
(2)冷拉场地应在两端地锚外侧设置警戒区,并应安装防护栏及警告标志。无关人员不得在此停留。操作人员在作业时必须离开钢筋2m以外。
(3)用配重控制的设备应与滑轮匹配,并应有指示起落的记号,没有指示记号时应有专人指挥。配重框提起时高度应限制在离地面300mm以内,配重架四周应有栏杆及警告标志。
(4)作业前,应检查冷拉夹具,夹齿应完好,滑轮、拖拉小车应润滑灵活,拉钩、地锚及防护装置均应齐全牢固。确认良好后,方可作业。
(5)卷扬机操作人员必须看到指挥人员发出信号,并待所有人员离开危险区后方可作业。冷拉应缓慢、均匀。当有停车信号或见到有人进入危险区时,应立即停拉,并稍稍放松卷扬钢丝绳。
(6)用延伸率控制的装置,应装设明显的限位标志,并应有专人负责指挥。
(7)夜间作业的照明设施,应装设在张拉危险区外。当需要装设在场地上空时超过5m。灯泡应加防护罩,导线严禁采用裸线。其高度应
(8)作业后,应放松卷扬钢丝绳,落下配重,切断电源,锁好开关箱。
Clicks:7056 Updated:2015-05-11 【Print this page】 【Returns
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Copyright:Suzhou Ritong Metal materials Co., Ltd   Address:Suzhou city Wuzhong District Pu Zhuang Zhen and Ann West Road No. 1238 (Pu Yang Road)
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