How to improve the hoist hook stopper

  The hook hoist limit device's main role is to work with the guide rope, when the  Wire rope hoist  hook up or down to limit the height, rope guide rod will push the limit stops, limit switches off, so that the lifting hook is stopped, but many clients is reflected in the process easily damaged rope guide, the stopper displacement often occurs, resulting in failure of the hook stopper, an accident may result. For the above electric hoist users how to avoid? Have improve this hook stopper way to do? The following introduces you to:
       Under normal circumstances the use of electric hoist, the limit is in effect when the hook, hook and hoist has 500 ~ 600mm shell between a safe distance. Then we can use a safe distance from the gourd shell with hammer stopper, can be avoided.
       Will be a steel cable electric lift hoist  switch fixed in the housing, normally closed contacts in series with the contactor coil upward hook loop inside. The hammer from the hoist through the cable housing 300mm mounted in position, when the rising stopper fails, bottom of the  rope hoist  hook will continue to rise, this time from the top weight will be, given the gravity pull lose weight, normally closed switch contacts open, the contactor control coil power loss, hook will stop rising, to avoid hoisting accidents.