Centering-type counter-weight limiting buffering mechanism

The utility model discloses a centering-type counter-weight limiting buffering mechanism. The centering-type counter-weight limiting buffering mechanism comprises guide shafts, screws, first nuts, second nuts, first gaskets, shafts, pressure blocks, butterfly springs, second gaskets, first spacing sleeves, bearings, second spacing sleeves, counter-weight blocks, rollers, end plates and first bolts; each counter-weight block is pressed on the corresponding guide shaft through the corresponding roller; the screws are arranged on the counter-weight blocks; each second gasket, each butterfly spring, each pressure block and each gasket penetrate through each screw in sequence and are locked by the second nut and the first nut; the shafts penetrate through the first pressure blocks, the first spacing sleeves, the bearings and the second spacing sleeves in sequence and are axially positioned by the end plates and the bolts. By the adoption of the technical scheme of the utility model, not only can gapless complete l