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钢丝绳使用和报废标准 Wire rope use and scrap standard

钢丝绳使用和报废标准

钢丝绳使用和报废标准

钢丝绳使用和报废标准

  一、钢丝绳使用注意事项

  (一)使用前检查内容

  钢丝绳的磨损、锈蚀、拉伸、弯曲、变形、疲劳、断丝、钢丝绳绳芯露出的程度。

  (二)保养注意事项

  1. 钢丝绳的使用期限与使用方法有很大关系,因此应做到按规定使用,禁止拖拉、抛掷,使用中不准超负荷,不准使钢丝绳发生锐角折曲,不准急剧改变升降速度,避免冲击载荷。

  2. 钢丝绳有铁锈和灰垢时,用钢丝刷刷去并涂油。

  3. 钢丝绳每使用4个月涂油一次,涂油时最好用热油(50℃左右)浸透绳芯,再擦去多余的油脂。

  4. 钢丝绳盘好后应放在清洁干燥的地方,不得重叠堆置,防止扭伤。

  5. 钢丝绳端部用钢丝扎紧或用熔点低的合金焊牢,也可用铁箍箍紧,以免绳头松散。

  6. 使用中,钢丝绳表面如有油滴挤出,表示钢丝绳已承受相当大的力量,这时应停止增加负荷,并进行检查,必要时更换新钢丝绳。

  7. 在使用过程中,应注意防止以下情况出现:

  (1)钢丝绳与电焊线接触。

  (2)钢丝绳间直接接触。

  (3)钢丝绳与金属尖锐棱角经常摩擦。

  (4)钢丝绳从已经破损的滑轮上穿过。

  (5)吊装角度超过60º。

  (6)在高温物件上使用的钢丝绳,必须采取隔热措施,以防降低强度和寿命。

  (7)钢丝绳报废切断时,应有防止绳股散开的措施。

 

  二、钢丝绳报废标准

  钢丝绳出现下列情况之一,应予以报废:

  1. 对于交绕的钢丝绳在一个捻距(指任意一个钢丝绳股环绕一周的轴向距离)内的断丝数达该绳总丝数的10%。

  2. 吊运炽热金属或危险品的钢丝绳,其报废断丝数取一般起重机的一半,如断丝现象集中发生于局部,或在六倍于钢丝绳直径长度内断丝集中发生在一股上,应按第1项中所规定的一半即可报废。

  3. 钢丝绳表面层钢丝腐蚀或磨损达表面原丝径的40%。

  4. 钢丝绳有明显的内部腐蚀。

  5. 钢丝绳直径减少量达7%。

  6. 钢丝绳与铝合金接头部位有裂纹或滑移变形;插编钢丝绳索具插编部位有严重抽脱;浇铸钢丝绳锚具与钢丝绳连接处有位移,发生抽脱现象。

  7. 钢丝绳表面有磨损或腐蚀,又有一定数量的断丝,断丝数应在第1项或第2项的规定上乘以折减系数后判定:当磨损或腐蚀率分别在10%、15%、20%、30%-40%时,折减系数对应85%、75%、70%、60%、50%。

  8. 整股断裂或烧坏。

  9. 局部外层钢丝绳伸长呈“笼”形或钢丝绳纤维芯的直径增大较严重。

  10. 钢丝绳发生扭结、死角、硬弯、塑性变形、麻芯脱出等严重变形。

 

1. Matters needing attention in the use of wire rope

(1) Check the content before use

The degree of wear, corrosion, stretching, bending, deformation, fatigue, broken wire, and exposure of the core of the wire rope.

(2) Maintenance precautions

1. The service life of the wire rope has a lot to do with the method of use. Therefore, it should be used according to the regulations, dragging and throwing are prohibited, overloading is not allowed during use, the wire rope is not allowed to bend at an acute angle, and the lifting speed is not allowed to change sharply. Avoid shock loads.

2. When the wire rope has rust and dust, use a wire brush to remove it and apply oil.

3. The steel wire rope should be oiled every 4 months. It is best to soak the rope core with hot oil (about 50℃) and wipe off the excess grease.

4. After the wire rope is wound, it should be placed in a clean and dry place, and should not be stacked to prevent sprain.

5. The end of the wire rope should be fastened with steel wire or welded with alloy with low melting point, or can be fastened with iron hoops to avoid loosening of the rope head.

6. ​​During use, if oil droplets are squeezed out on the surface of the wire rope, it means that the wire rope has been subjected to considerable strength. At this time, the load should be stopped and the inspection should be carried out. If necessary, replace with a new wire rope.

7. During use, care should be taken to prevent the following situations from appearing:

(1) The wire rope is in contact with the welding wire.

(2) Direct contact between steel wire ropes.

(3) Steel wire rope and metal sharp edges and corners are often rubbed.

(4) The wire rope is passed through the broken pulley.

(5) The hoisting angle exceeds 60º.

(6) The steel wire rope used on high temperature objects must be insulated to prevent the strength and lifespan from being reduced.

(7) When the wire rope is scrapped and cut, there should be measures to prevent the strands from spreading.

2. Steel wire rope scrap standard

The wire rope should be scrapped if one of the following occurs:

1. The number of broken wires in a lay length (referring to the axial distance of any wire rope strand around a circle) for the entangled wire rope reaches 10% of the total wire number of the rope.

2. For steel wire ropes that are used for lifting hot metal or dangerous goods, the number of scrapped and broken wires is half of that of ordinary cranes. If wire breakage occurs locally, or within six times the diameter of the wire rope, it should be Half of the stipulated in item 1 can be scrapped.

3. The corrosion or abrasion of the steel wire on the surface of the wire rope reaches 40% of the original wire diameter.

4. The steel wire rope has obvious internal corrosion.

5. The wire rope diameter is reduced by 7%.

6. ​​There are cracks or slipping deformation at the joint between the steel wire rope and the aluminum alloy; the insertion part of the inserted braided steel wire rope is severely pulled off; the cast wire rope anchorage and the wire rope have displacement at the connection point, and the phenomenon of pulling off occurs.

7. The surface of the steel wire rope is worn or corroded, and there are a certain number of broken wires. The number of broken wires should be determined by multiplying the provisions of item 1 or item 2 by the reduction factor: when the wear or corrosion rate is 10%, 15 %, 20%, 30%-40%, the reduction factor corresponds to 85%, 75%, 70%, 60%, 50%.

8. The whole strand is broken or burned out.

9. The local outer steel wire rope elongates in a "cage" shape or the diameter of the steel wire rope fiber core increases severely.

10. The wire rope is seriously deformed such as kinks, dead ends, hard bends, plastic deformation, and hemp core out.

南通市华通钢绳有限公司

华通钢绳——专业生产钢丝绳的中型企业

OK牌钢丝绳质量可靠、规格齐全、价格合理,深得广大用户青睐,产品畅销全国二十多个省市、自治区及欧美、东南亚等国家。

The OK brand steel wire rope has reliable quality, complete specifications, and reasonable price. It has won the favor of the majority of users. The products are sold well in more than 20 provinces, municipalities, autonomous regions, Europe, America, Southeast Asia and other countries.

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