Explosion insulated electro hydraulic thruster are made of actuating motor and body,and the body has cover,jar,piston,wheel and swivel.When it is electrified,the motor will drive the turning axis and its wheels turning,and make pressure in the poistion;under the influence of pressure,the oil will be sucked from the top to the bottom of the piston,and forces the piston and the pole and bearn fixed on piston to rise quickly.Compressing loading spring by lever,it will make mechanical motion(Puller or brakef attaching loading springs).(If matched with YWZ series Liquid pressure puller,it will declutch).When it is cut off by electricity,the wheel stop turning,and the piston will drop quicky for the spring of loading spring and itself weight to force the oil to be re-back to the top of the piston,in the meantime the reset attachment will work by lever.