Synchronous electric chain hoist lifting Precautions:
Under normal circumstances people are choosing to use alternative electric chain hoist
manual hoist s hoisting construction groups in the new tank, large oil tank welding, etc., can greatly reduce the labor intensity of construction workers and improve working efficiency. However, the construction of the tank lifting hoist how to avoid overloading operation is to improve the efficiency and safety of the key, but also need to attach great importance to the construction team for each question.
First, the overall weight of the tank must be calculated correctly, generally selected from the hoist that the total weight of the overall weight of the tank 1.3 to 1.5 times. After determining the number of units of electric hoist, to accurately calculate and determine the spacing of hanging points, each lifting point spacing must be equal and balanced distribution. Requirements for the first time since the construction process less open sunroof, so for the first time hanging point to as little as possible, except for the first hanging point requires consistent spacing, but also consider the balanced lifting points after setting, in order to maintain equal spacing of each single lifting point, as far as possible electric
chain block s are set to run to create the conditions.
Based on past experience in construction, for the first time hanging point is generally selected hoist half the number of units, the second hoisting construction has been completed, that is, in a timely manner before the third layer lifting up into the rest of all lifting points uprights, hang entire electric hoist, all put into the third layer lifting operation. In improving operations, up to the experienced professional rigger professional rigger is responsible for on-site commander.
Despite the selected hoist safety factors have been taken into account, but because HHS-10t low-speed electric chain hoist is used in disc brake three-phase asynchronous motors, brake asynchronous motor characteristics, so that different motor speed is inevitable exist some differences, which determines the electric hoist speed can not be completely synchronous operation, especially with the overall lifting of continuous operation time longer, increase the speed difference accumulation, making the hoist between the actual load changes Some electric hoist lifting slowly bearing constantly reduced, or even no bearing; while some electric hoist Since l fast, carrying increasing, hoist the possibility of running in the event of overload continues to increase, in this case if the viewer is not note that the individual is likely to occur
hoist equipment overload operation. Which in turn increase to the overall construction hoisting lifting of the moment, with construction experience first hand down the perceived tightness of the chain hoist, move the adjustment loose or tight single hoist up or down until the chain tightness basically the same before the official start upgrading; during normal upgrade process, you want to send someone constantly monitors the functioning of electric hoist, electric hoist visually observed whether the shutdown and the tightness of the chain; motors and hoists with ears whether there is abnormal operation sound, if unusual, timely stop, identify the cause and adjust the chain tension, electric hoist for failure to timely replacement and maintenance. Erection occurs during the trip, burning fuse the situation, the more you want to inspect the hoist load, adjust the chain tension and so on.
Also, according to each lifting height and construction schedule, appropriate adjustments to the number of checks intermediate stop. Normal run-time jobs each intermediate stop to check 2 or 3 times, if it is appropriate to increase the down-storey increase the frequency of inspections;wire rope winch near the end capping layers, not only to increase the number of intermediate stop to check, but also to strengthen the monitoring operation of hoist situation, because with the increase of the total load, electric hoist overload occurs also increases the chance of running.