A piston-type oil tank with safety valve have a tank body, a separator piston arranged inside the tank body, and an oil inlet and an air outlet provided at the front and rear ends of the separator piston respectively. The separator piston is arranged with a penetrated safety valve core, a support frame is arranged at the end of the safety valve core facing the air outlet, and a stop plate is provided at the end of the safety valve core facing the oil inlet. An oil discharge groove is provided on the side wall of the safety valve core. When the support frame presses against the end face where the air outlet is located, the oil discharge groove connects the spaces on both sides of the separator piston, and an oil outlet gap is reserved between the support frame and the end face where the air outlet is located.

A semi-truck brake shoe riveter configured to simultaneously rivet an opposing pair of semi-truck brake shoes without requiring assistance from others besides a main operator of the semi-truck brake shoe riveter. The semi-truck brake shoe riveter is automated and utilizes a double brake shoe riveter configuration. The double brake shoe riveter configuration is moved into place to precisely rivet a pair of brake shoes to a pair of brake shoe tables with two pairs of hydraulic rams and two pairs of precisely automatic riveter anvils. The two pairs of hydraulic rams include sensors to detect unaligned rivets to precisely rivet the pair of brake shoes to the pair of brake shoes tables. The semi-truck brake shoe riveter also accommodates regenerative semi-truck brakes.

A semi-truck brake shoe riveter configured to simultaneously rivet an opposing pair of semi-truck brake shoes without requiring assistance from others besides a main operator of the semi-truck brake shoe riveter. The semi-truck brake shoe riveter is automated and utilizes a double brake shoe riveter configuration. The double brake shoe riveter configuration is moved into place to precisely rivet a pair of brake shoes to a pair of brake shoe tables with two pairs of hydraulic rams and two pairs of precisely automatic riveter anvils. The two pairs of hydraulic rams include sensors to detect unaligned rivets to precisely rivet the pair of brake shoes to the pair of brake shoes tables. The semi-truck brake shoe riveter also accommodates regenerative semi-truck brakes.