FAQ >> Metallurgical cranes on the technical requirements for special work

Metallurgical cranes on the technical requirements for special work

AQSIQ "quality to do special ?2007? 375" document, published in the use of non-metallurgical crane for lifting the molten metal in the remediation requirements, as follows, for everybody to learn, discuss and exchange. (A) has been used for general overhead crane lifting molten metal, shall be replaced in order to comply B/T7688.15-1999 "Metallurgical ladle crane technical conditions" requirement of the casting crane. If the plant, based on such factors as the conditions do not have the replacement unit casting crane, in addition to general overhead crane to meet the norms and standards and regulations, must transform the original crane and technical conditions to achieve the following basic requirements: 1. By special metallurgical lifting motor, when the ambient temperature exceeds 40 ? of the occasion should be used in Class H motor insulation; 2. Equipped with two sets of independent role of the brake (dual braking); 3. To be installed from the weight limiter; 4. Equipped with different forms (usually a heavy hammer and rotary-type and use) the location of the rise in the double limit stopper (double limit), and should control the various circuit devices, lifting height greater than 20m of cranes, It should also be installed as needed down limit position limit switch; 5. With silicon the stator voltage, eddy current brakes, power brakes, SCR power supply, DC power supply unit and the other the speed governor may cause speeding and 20t lifting mechanism for lifting the molten metal above General bridge crane must have the overspeed protection; 6. Hoisting mechanism should have positive and negative contactor fault protection to prevent the loss of power and brake motors are still in power which led to stall occurred; 7. The protection of all electrical equipment should meet the relevant requirements of the standards; 8. Long-term work in high temperature environment of lifting machinery, electric control device of its protective measures need to be taken; 9. Select occasions for high temperature wire, and has adequate safety factor; 10. Do not use cast iron pulley; 11. The original crane below the level of A6 (not including the A6), and should reduce the load used, decrease the work should be based on the actual circumstances, but after shedding the weight from the provisions of the original rated capacity shall not exceed 80%. (B) has been used for more than the rated lifting capacity 10t of the electric hoist as the lifting mechanism of the various types of lifting appliances, lifting molten metal is not allowed. (C) has been used for the rated capacity less than or equal to 10t of the electric hoist as the lifting mechanism of the various types of crane lifting molten metal, and must be replaced or modified the original crane and technical conditions to achieve the following basic requirements: 1. Shall not be used for general electric hoist lifting mechanism; 2. Has the support of the brake and safety brake; 3. With the rise of different forms of double stopper (height greater than 20m, hoisting cranes, but also decrease the limit position limit switch installed); 4. Has a starting weight limiter; 5. With high-temperature thermal protection function of the electric hoist; 6. A condition for lifting the molten metal sufficient safety factor, the working class to achieve the M5-level (including the M5 level) above; 7. Select the wire for high temperature situations, and has sufficient safety factor; 8. As far as possible away from heat sources such as the manipulation of remote control mode, otherwise the operator must set the security channel. (D) The crane must have a transformation of the transformation of units permitted qualified, reform must fulfill the procedures for cranes after transformation, must be made through a qualified inspection and testing institutions in accordance with the "Crane Inspection Rules" and the supervision and inspection requirements of this article , qualified only after put into use in accordance with regulations. (E) the crane lifting the transformation of molten metal should be in June 30, 2008 completed, the use of replacement units should immediately formulate plans or rehabilitation programs, pay close attention to the implementation of, or should be suspended. During the implementation of the transformation, and use should be care to use, must take effective measures to ensure the safe operation of equipment. (F) lifting the molten metal crane on a regular basis to shorten the inspection cycle from 2 years to 1 year.

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