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  • 4钢丝绳手扳葫芦测评质量问题
    您的位置: 首页 > 新闻资讯 > 常见问题 > 钢丝绳手扳葫芦测评质量问题
    场上的钢丝绳手扳葫芦质量参差不齐,以下是针对多家厂家测评后对手扳葫芦做出的一个整体测评:


    1、无载荷试验


    要求无载荷时往复扳动前进杆及反 向杆三次 ,机构工作应灵活 , 无卡阻现象。 试验时少数厂家的产 品钢丝绳不易穿入 ,工作时有卡阻存在。


    电动葫芦能效试验台控制系统


    2、额定载荷试验


    在额定载荷下 , 手扳力不得大于 41 1N , 手柄往复一次 , 钢丝绳行程应不小于 25mm ( HS S- 3) 和 5 0mm ( HS S- 1. 5 ) 。实测时 , 不合 格产品绝大部分手扳力超标 , 较大为 67 3N; 工作行程过小 , 较小为 32mm ( HS S- 1. 5 ) 。


    3、动载试验


    要求在 1. 1 倍载荷下上升、 下降各一次 , 整机工作应平稳可靠、 无异常。 不合格品主要表现为上升行程中自滑下降量增大 , 较大值达 12mm ( HS S- 1. 5 ) 。


    4、静载荷试验


    标准规定 , 手扳葫芦在试验机上 逐步加载至 1 . 5倍额定载荷时停留 1 0mi n, 夹子、 夹紧板不得有影响使用性能的永久变形。 少数厂家的产品试验中夹紧板发生翘变 , 导致工作时工作阻力增大和钢丝绳行程变短。


    5、吊钩试验


    主要控制钩口变形和吊钩强度两项 指标。 少数厂家所配吊钩系回收翻新产品 , 有折叠变形等降低强度的局 部缺陷。


    6、加工装配质量


    不合格产品主要表现 在夹子轴两轴颈加工精度低 ,同轴度严重超差 ( 要求不大于 0. 05mm , 实测较大值为 0. 8mm) ; 夹子轴配 合端未进行热处理 , 硬度值偏低 ( 要求 HRC 3 5 ~ 40 , 实测较小为 HRC 30 ) ; 控制 初始夹持力的弹簧选用不当 , 弹性力有的过 大、有的过小 ; 甚至有的将前进手柄装错在死点位置 ,使机构不能正常工作。


    7、配用钢丝绳


    为降低成本 , 不合格产品厂家配用劣质钢丝绳 , 钢丝绳直径超过国家标准规定下限 , 采用麻芯钢丝绳代替西尔型金属芯绳。


    8、外观质量及标志


    标准要求机壳及手柄 表面的涂漆应均匀光泽、 光亮 , 不可有污迹 、 气泡、 缩皱、 脱落和粗糙不平等缺陷 , 各种标志应清晰齐全 。 不合格产品的涂漆粗糙 , 有流挂和剥落现象。 标志混乱 , 无生产日期或生产批号 , 无松卸手柄的工作指示箭头和警示标志 , 随机资料不能正确指导用户使用维修 , 大部分厂家未领取生产许可证。

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