Buckets: In order to keep the body clean bucket bucket wall, leaving no residual material, hook style bucket, bucket deactivated when the water wash as soon as possible, the production of hook-type bucket to keep the bucket clean and smooth inner walls without mortar adhesion. Welded steel plate welded to the upper portion of the pin holder, pin holder processing barrel body cone is prolate holes can accommodate latch hook through. When the amount of wear at the bucket beam hook to achieve the following circumstances, the proposed replacement: When the barrel wall uneven severe bending, severe corrosion, tank wall thinning, local weld cracking, then repair should be carried out. Stored more than six months, check the use and maintenance. It should be stored indoors.