At the bottom of the water chamber, there are large rocks and other waste blocking the scraper. When the mechanical grid shrinks to the bottom of the water chamber, the bottom block of the trolley collides with the bottom block of the track, and the scraper rotates by weight, thereby gradually realizing the functions of sludge treatment and decontamination. If the stones at the bottom of the water chamber happen to be quite large or other heavy waste blocks the scraper, the scraper won't spin as it spins under its own force. Rake tines and grille are stuck in mesh. After reaching the bottom of the water chamber, the rake rotates. However, because the grid is blocked or the parallel surface of the decontamination rake is not lowered, the teeth are inclined, the grid and the rake are offset, and the rake and the grid are stuck, resulting in the decontamination rake unable to rotate normally. The shaft and rolling bearings are jammed. Rolling bearings are used in mechanical grids. If the clearance between the rolling bearing and the shaft exceeds the standard, or because fine sand enters the rolling bearing when the dust rake enters the water, the shaft may become stuck and cannot stand, resulting in the dust rake being unable to rotate. After all, the mechanical grid of the system software cannot turn over the rake. When removing the bearing of the scraper drive shaft with the seat, it was found that there was fine sand deposition inside, and the erosion was serious. The reason is that when the mechanical grille is running left and right, there is too much fine sand on the sea surface of the channel, which leads to damage to the rolling bearing, the drive shaft is stuck, and the rake cannot be turned over.

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