Rail clamp machine adopts high-quality steel manufacturing, has a compact structure, safe and reliable appearance is small size, light weight, easy installation, etc. Especially suitable for the construction of the fixed beam, which can realize track width of the infinite adjustment, is very convenient. For as the fixed Electric Hoist lifting point. In constant velocity crane hoisting large motor brake hub will automatically open, stop automatic locking, can be in when using a slow lifting by small motor to drive the big rolling, the large motor not electricity, large motor brake hub is can't open, is very slow, but the big motor brake locking in a state of rolling will give worn brake rubber, it really does not slow lifting of brake problems, also on that slow the process of lifting or falling slowly wear brake drum is always locked in a state.