Being a column structure and downward pressing type, the heating plate opens by the self-weight of the heating plate, platform and plunger. The rising of the plunger makes the heating plate close while the hydraulic oil provides the pressure. This engine base is combined together with the cylinder and base frame, which is made of ductile iron to increase the cylinder intensity and a brad ability. The cylinder is fitted with the sealing washer made of the oil-resisting rubber for the sealing purpose. By moving the operational handle of the control valve to the two different positions, the heating plate can open and close. It uses the electric pipe for heating, thus makes the workshop clean with easy and reliable operation.