Due to the adoption of the tubular body shell closed, the electromagnetic coil generates magnetic field basically no leakage, so the pull push the can greatly enhance, equipped with high precision self lubricating bearings, to ensure that the radial without moving, wear resistance has been significantly improved, so the service life than similar products can promote more than 30%, closed the outer tube while protecting, very good for the electromagnetic coil up to sum up, this kind of tubular electromagnet is suitable for narrow space, high strength requirements, applicable to relatively harsh environment conditions.