The vtllty m rloles to the fhnical fel of croes, in which a presure ple tye craneis movably sleeved inside the botlom dik, ond a lood bosring block is ffled Inside the placsmt lot. Th load borng bock con dost the oigh of the plaoeroent slot, and roduce the problem of deviationin the position of the bomom dik n the sarme time, the length of the supporthng lkg ls sloevot, which can Incroase thecoatatt uroco bteeon the lone pat ol the botiom dfkndthgnd, Ts cannree the stobiyf te bdit durisg iftin, nd theld boaring objts idethe plscement slot can be token aray, foolitating thecorvenie olingtalltion sn demly.