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1.故障现象1台MQ1260型高架门式起重机作业时,其主钩突然发生溜钩故障。该故障发生时已是下班时间,施工现场无人,未发生伤人和砸坏物件事故。经了解得知,该起重机主钩平时也存在溜钩现象,只是没有这次严重。该起重机额定起吊质量为60t,这次只是起吊1个质量为5.6t的卧式罐,按照常理不应发生溜钩故障。主钩溜钩故障危害极大,必须尽快修复。2.制动器结构和原理起吊该卧式罐时发生溜钩故障,说明该起重机制动器制动力矩不足,为此需分析制动器结构和工作原理。(1)结构该起重机主钩制动器为电磁块式制动器,由液压式电磁铁1、杠杆2、挡板3、螺杆4、主
1. Symptom 1 MQ1260 overhead gantry crane operation, the main hook suddenly slip hook failure. The failure occurred after get off work time, no one at the construction site, wounding and smashed objects did not happen accident. It is understood that the crane main hook there are usually slip hook phenomenon, but not the serious. The lifting crane rated lifting capacity of 60t, this time only lifting a quality of 5.6t horizontal tank, according to common sense should not slip slippery hook. The main hook slide hook damage is extremely harmful and must be repaired as soon as possible. 2. Brake Structure and Principle When lifting the horizontal tank, there is a slip-hook fault, which indicates that the brake torque of the crane is insufficient. Therefore, the structure and working principle of the brake should be analyzed. (1) Structure The crane main hook brake electromagnetic block brake, the hydraulic solenoid 1, the lever 2, the baffle 3, the screw 4, the main