safety hook

all kinds of safety hook

各种保险钩

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Riggers and signal persons also need standard training and testing to ensure safety under the hook.

装配工人和发信号的人也需要标准的培训和测试,以确保安全下钩.

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a new type of safety hook against dropping of sucker rod

新型抽油杆防脱安全吊钩

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The writer verifies that the designed safety coefficient of wire line should be bigger than 3 while the hook has the speed of 0.4-0.55 m/ sec at hook load rating, corresponding to the drawworks operation at the third speed and air clutch operation at rated torque;

证实额定大钩钩载时，大钩速度为0.4～0.55米/秒，相当于绞车在Ⅲ档工作，气胎离合器在额定扭矩工作，此时钢丝绳设计安全系数大于3。

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