Gap adjusting system for crusher and method

A system for adjusting a gap between rotary striking blades or hammers and an operating plate in a crusher comprising;

• a sensing means capable of coming in contact with said rotating striking blades or hammers during service;
• a means for shifting said sensing means towards said striking blades or hammers, said shifting means including a slider on which is disposed said sensing means, a ball screw threaded with said slider, and a first motor for turning said ball screw;
• a converting means for converting the extent of shift of said shifting means into an extent of displacement of said operating plate, said converting means including a computer capable of calculating the difference between the extent of shift of said shifting means and an extent of displacement of said operating plate;
• and,
• a means for moving said operating plate including a connecting rod connected at one end of said operating plate, a slider supporting the other end of said connecting rod, a ball screw threaded with said slider, and a second motor for turning said last mentioned ball screw, said first and second motors respectively being electrically connected to said computing means.

A method for adjusting a gap between striking blades or hammers and an operating plate in a crusher to a predetermined distance, said method comprising the steps of:

• moving a sensing means into contact with said rotating striking blades or hammers by moving a slider provided with said sensing means towards said rotating striking blades or hammers by means of a motor mechanically coupled to said slider, while counting the distance moved by said slider from its starting point;
• detecting the extent of wear of said striking blades or hammers from the total distance moved by said slider thus counted and from the total distance moved by said slider previously obtained when said gap was in said predetermined distance;
• and
• shifting said operating plate towards said striking blades or hammers by means of a motor by the distance commensurate with said extent of wear thus detected.