The use of non-fixed direction design, so that the machine core can be rotated left and right, regardless of left and right directions, according to the need to change the starting and falling direction of the brake rod at will, the scope of application is more extensive; in the case of resistance rebound (pressure wave smash prevention): brake rod in the process of falling, if encountering external force blockage, it will automatically start the pole, reduce the damage caused by errors.