Impact-resistant balanced hydro-cylinder with pressure relief and buffering protection

An impact-resistant balanced hydro-cylinder with pressure relief and buffering protection, comprising a cylinder body (11), a piston (13), a piston rod (14), and a first valve core (21) and a second valve core (51) slidable relative to the cylinder body (11), wherein a closed first gas cavity (22) is formed between the first valve core (21) and an inner wall of an end of the cylinder body (11) and a closed second gas cavity (52) is formed between the second valve core (51) and an inner wall of an opposite end of the cylinder body (11), a closed first oil cavity (32) is formed between the first valve core (21) and an end face of the piston (13) and a closed second oil cavity (42) is formed between the second valve core (51) and another end face of the piston (13), and a through hole (33) for the first oil cavity is provided at a position on the cylinder body (11) corresponding to the first oil cavity (32) and a through hole (43) for the second oil cavity is provided at a position on the cylinder body (11) corresponding to the second oil cavity (42);

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• wherein a one-way valve (25) for the first gas cavity and a one-way valve (55) for the second gas cavity are mounted on the cylinder body (11) and communicate with the first gas cavity (22) and the second gas cavity (52) respectively.