1. Before the mechanical grating is lowered to the bottom of the tank, flip the rake over

 (1) The diameter of the left and right reels of the transmission shaft is different. The reel belongs to the lifting mechanism of the mechanical grid, and the wire rope is directly and evenly wound on the reel. When the motor drives the drive shaft to rotate, the reel drives the wire rope to do vertical lifting. If the diameters of the drums on both sides are different, the descending speed of the wire ropes on both sides will be different, and the levelness of the wire ropes will not be able to, so the decontamination rake will not be able to descend horizontally. When the inclination reaches a certain level ( it does not reach the bottom of the water chamber at this time ) , the friction between the decontamination rake and the track will increase, so that it will be stuck on the track, and the scraper will turn over by its own weight, losing the function of dredging and decontamination.

 (2) The diameter of the wire ropes on both sides is different. The mechanical grill relies on two wire ropes to drive the decontamination rake to move up and down, so the diameter of the wire rope will not lead to the situation that one wire rope is long and the other wire rope is short during the descending process of the decontamination rake, which makes the decontamination rake inclined and the level is not enough. When the friction of the track increases to a certain level, the decontamination rake will automatically turn over and lose its decontamination function. The 1CRF102DG could only go down to -21m before the 106 overhaul , and then there was a rake. According to the operator's measurement, it was found that the diameter difference between the left and right wire ropes ( both left-handed ) was 1 mm. Analysis showed that the two wire ropes were rotated in the same direction, resulting in uneven stress, and one of them was elongated. The worker replaces two steel wire ropes ( one left twist, one right twist ) , moves the mechanical grille again, and can smoothly descend to -24.6 meters ..

(3 ) Insufficient track flatness ( horizontal, vertical ). The trolley in the decontamination rake goes up and down along the track. If the horizontality and verticality of the track cannot meet the design requirements, or the track is deformed due to the above two reasons, when the trolley descends to the track deformation, the clearance between the guide wheel and the track is insufficient, resulting in the trolley being stuck on the track, and the frictional force is too high. large, leading to overturning of the rake. 1SEC102DG descends to about -4.2m , automatically turns over the rake, and cannot continue to descend or ascend. After inspection, the tightness of the wire rope is normal, and there is no insufficient level of the wire rope. Preliminary judgment is that the track is uneven or there are debris stuck on the guide wheel. The mechanical grill cannot go up and down due to the slack rope alarm and over-torque protection. The staff slightly adjusted the limit value of the over-torque protection device. After the mechanical grille is successfully raised in place, use a ladder to rise to -4.2m , and find rust on the inside of the track . Use a scraper to remove the rust on the inside of the track, and try the mechanical grille again to eliminate the fault.

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