Bottom cylinder for high-temperature and high-pressure environment simulator

A bottom cylinder for a high-temperature and high-pressure environment simulator, comprising a cylinder barrel, open at a top and a bottom, wherein the bottom of the cylinder barrel is provided with a cylinder base in a sealed manner;

• and a piston is provided inside the cylinder barrel in a movable and sealed manner, and the piston divides an inner cavity of the cylinder barrel into a rodless cavity and a rod cavity;
• an upper end surface of the piston is provided with a piston rod;
• and the piston rod has a top end and an outer wall, wherein the top end passes through a top opening of the cylinder barrel, and the outer wall is connected to an inner wall of the cylinder barrel in the movable and sealed manner;
• an outer wall of the cylinder barrel is provided with an oil inlet hole and an oil outlet hole, wherein the oil inlet hole is communicated with the rodless cavity, and the oil outlet hole is communicated with the rod cavity, and the outer wall of the cylinder barrel is provided with a reserved hole;
• a lower end surface of the piston projects downward to form a mounting post;
• a circumferential outer wall of the mounting post is provided with a first buffer ring;
• and the first buffer ring has an upper end surface and a lower end surface, wherein the upper end surface of the first buffer ring is connected to the lower end surface of the piston in a sealed and fixed manner, and the lower end surface of the first buffer ring projects from a lower end surface of the mounting post;
• and
• an upper surface of the cylinder base interfaces with a second buffer ring positioned to mate with the first buffer ring;
• and the second buffer ring has a lower end surface and a circumferential sidewall wherein, the lower end surface of the second buffer ring is connected to the upper surface of the cylinder base in a sealed and fixed manner, and the circumferential sidewall is connected to the inner wall of the cylinder barrel in the sealed and fixed manner.