Pre-grinding system for reducing material

In a pre-grinding system for reducing scrap material to chips, said system comprising:

• a pre-crusher for impact grinding the material;
• a feed chute for collecting the material for impact grinding connected to said pre-crusher, said feed chute including a feed chamber, a cover for closing said feed chamber, said cover having an opened-loading position and a closed-operating position, and a gate providing access from said chamber into said pre-crusher, said gate having a closed-loading position and an opened-operating position;
• a hydraulic feed cylinder section for transferring the material from said feed chute into said pre-crusher;
• and
• a control system for controlling said cover, said gate, and said hydraulic cylinder section, wherein said control system moves said gate from said closed-loading position to said opened-operating position only when said cover is in said closed-operating position.

In a pre-grinding system for reducing scrap material to chips, said system having a pre-crusher for impact grinding the material, a feed chute for collecting the material for impact grinding, and a hydraulic cylinder section for transferring the material from said feed chute into said pre-crusher, an improvement comprising:

• a feed chute trough including a feed chamber, an opening providing access into said feed chamber, and a side wall having a recess extending downwardly from said opening;
• a feed chute cover pivotally connected to said feed chute trough, said feed chute cover having an overhang having a shape corresponding to the shape of said recess, wherein said recess provides horizontal access into said feed chute for viewing into said feed chamber;
• and
• a hydraulic actuator for opening and closing said feed chute cover;
• and
• a counterbalance valve for dampening closure of said feed chute cover.

In a pre-grinding system for reducing scrap material to chips, said system having a pre-crusher for impact grinding the material, a feed chute for collecting the material for impact grinding, and a hydraulic cylinder section for transferring the material from said feed chute into said pre-crusher, wherein said feed chute is connected to said pre-crusher, and wherein said cover includes an opened-loading position and a closed-operating position, and wherein said feed chute includes a gate providing access from said chamber into said pre-crusher, said gate having a closed-loading position and an opened-operating position, said system comprising:

• a feed chute trough including a feed chamber, an opening providing access into said feed chamber, and a side wall having a recess extending downwardly from said opening;
• a feed chute cover pivotally connected to said feed chute trough, said feed chute cover having an overhang having a shape corresponding to the shape of said recess, wherein said recess provides horizontal access into said feed chute for viewing into said feed chamber;
• a hydraulic feed cylinder section for transferring the material from said feed chute into said pre-crusher;
• and
• a control system for controlling said cover, said gate, and said hydraulic cylinder section, wherein said control system moves said gate from said closed-loading position to said opened-operating position only when said cover is in said closed-operating position.