Piston position installation device of brake cylinder

A piston position installation device for a brake cylinder, including:

• a main rod, one of two ends thereof having a first driving portion, the other of the two ends thereof having a first threaded section along an axial direction of the main rod and toward the first driving portion, the main rod having an interior hole, the interior hole having a second threaded section which is arranged along the axial direction, screwing directions of the second threaded section and the first threaded section being counter to each other;
• an abutting rod, one of two ends thereof having a second driving portion, the other of the two ends thereof having a restricting portion, the abutting rod further having an exterior threaded portion screwed with the second threaded section, and the abutting rod being rotatably arranged within the interior hole;
• a force exerting member, having a first force exerting portion and a second force exerting portion, the first force exerting portion being arranged on the first driving portion, the second force exerting portion being arranged on the second driving portion;
• a socket, screwed with a first threaded section of the main rod;
• a blocking board, laterally outwardly protrusive from the socket.