Cooling device for cooling crystal bars of multiple crystal growing furnaces

The invention relates to the field of crystal bar forming, in particular to a cooling device for cooling crystal bars of a plurality of crystal growing furnaces, which comprises a fixing ring, a water inlet and outlet structure and a cooling disc, the cooling disc is arranged at the lower end of the fixing ring, and the lower end of the water inlet and outlet structure is communicated with the cooling disc; the three sets of cooling rings are sequentially communicated through water channels, an outer-layer crystal bar annular cooling channel is arranged between the outermost-layer cooling ring and the middle cooling ring, an inner-layer crystal bar annular cooling channel is arranged between the innermost-layer cooling ring and the middle cooling ring, the thickness of the innermost-layer cooling ring is smaller than that of the outermost-layer cooling ring, and the stepped multi-stage cooling rings are connected. Different cooling effects are achieved for crystal bars at different positions, a reasonable hea