Abstract The  vertical  shaft  impact  crusher  virtual prototype model was established based on the EDEM to simulate the  motion  stage  and  mechanical  properties  of  rock  materials flow  in  rotors  with  different  number  of  channels。  The  results show that the structure of the vertical shaft impact crusher rotor with 6 channels is most reasonable and the accelerating effect is best。  At  the  same  time,  the  rotor  with  excessive  channels  will make most of particles leave the rotor without  full acceleration。 However, the fewer the number of rotor channels are, the fewer particles  thrown  off  the  rotor  are  in  unit  time,  the  longer accelerating time is, which can reduce the crushing efficiency。 79857

 Index Terms – EDEM; Vertical Shaft Impact Crusher; Rotor; Virtual Prototype Technology;

 Channel 

NTRODUCTION

 The vertical shaft impact crusher (hereinafter referred to as VSI) has been widely used in the production of gravel with its simple structure, light weight, low cost, stable operation, high efficiency and production of better cube aggregate [1]。 Being an important part in VSI, the rotor although plays an accelerating role in rock materials broken; the stone could be  collided  and  broken  only  after  accelerated  in  the  rotor。  It has  been  founded  that  the  sand  production  rate,  fineness modulus  and  the  life  of  rotor  wearing  parts  were  all influenced  by  the  number  of  rotor  channels  in  the manufacturing  and  maintenance  for  many  years  of  VSI manufacturers。  The  accelerating  effect  of  rotor  to  particles was determined by the number of channels, thereby affecting the  sand  production  rate  and  the  fineness  modulus  of  VSI。 There is a great difference of stone in China, and the adaptation of different stone to  different  number  of  channels is  various。  Therefore,  it  has  been  urgently  required  by  VSI manufacturers  that  the  relationship  between  the  rotor accelerating  effect  and  the  number  of  channels,  then  the appropriate  number  of  channels  will  be  selected  to  the specific stone broken。 论文网

II。STRUCTURE AND WORKING PRINCIPLE OF VSI

 The  VSI  was  mainly  made  of  hopper,  rotor,  crushing chamber,  transmission  and  frame  structure,  as  it  can  be  seen in Fig。1。 Stone fell into the rotor through the hopper under the gravity,  and  were  equally  pided  into  every  channels  by separating  cone。  Accelerated  by  the  role  of  friction  and  therunner  plate,  stone  gradually  gained  the  kinetic  energy  and were  ejected  off  the  rotor  by  centrifugal  force  at  the  ejected speed which almost reached the liner speed of rotor edge。 At this  ejected  speed,  the  collision  between  stone  accelerated with  the  crushing  chamber  and  the  waterfall  stone  from  the sub-feeder  had  happened,  and  the  process  of  collision continued  about  5s~20s。Finally,  the  stone  without  kinetic energy left the crushing chamber under the gravity[2]。