Piston-type oil tank with safety valve and a riveting tool

A piston-type oil tank with safety valve, comprising:

• a tank body (1) housing a separator piston (2), and
• a first end plate provided with an oil inlet (3) and a second end plate provided an air outlet (4), the first end plate and the second end plate being disposed at a front end and a rear end of the tank body (1), respectively,
• wherein a safety valve core (5) extends through the separator piston (2) in a direction parallel to an axial direction of the tank body (1),
• wherein the safety valve core (5) comprises a support frame (6) disposed at a first end proximate to the air outlet (4) and a stop plate (7) disposed at a second end proximate to the oil inlet (3),
• wherein a length of the safety valve core (5) exceeds that of the separator piston (2), and a sidewall of the safety valve core (5) is provided with an oil discharge groove (23), and
• wherein, when the support frame (6) presses against the first end plate, the oil discharge groove (23) connects spaces in the tank body on both sides of the separator piston (2), and an oil outlet gap (8) is located between the support frame (6) and the first end plate.