Ore Crushing Beneficiation Process Flow - 1 views

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  #1 betsy stone on 01 Jul 14

   

  The paths of three points along the height of the movable jaws are diagrammed at 53, 54 and 55, respectively, in Figure 3. It will be seen that a point midway between the top and bottom edge of each movable jaw will follow a slightly elliptical orbit 54 corresponding very nearly to the orbit of the eccentric axis of the driver, but modified, of course, by the pitman guide links, so as to be noncircular.Gabbro Crushing Beneficiation Process Flow. The lower edge of each jaw likewise follows an orbital path, designated by 55, which, however, has a slightly larger component of horizontal motion because of its disposition below the axis of the pitman bearings; while the upper edges of the movable jaws will also follow orbital paths 53 which, while having less horizontal motion component than the orbits 54 of the midpoints of the jaws, will nevertheless be sufficiently circular as to be very effective in grinding and crushing stones at the entrances to the throats 36.
  
  Particular attention is directed to the fact that the axis of the pitman bearings 14 in which the eccentric is journaled lies in a horizontal plane which intersects the movable jaws midway between their top and bottom edges. As a result of this disposition of the pitman bearing axis, the reaction forces against the movable jaws are substantially balanced along their height, that is, substantially as much reaction force is imposed upon each movable jaw above the pitman axis as below it, with the result that little or no turning couple is imposed upon the jaws to tend to rotate the pitman about the pitman bearing axis. In consequence of this balance of the forces upon the movable jaws about the driver axis,Granite Crushing Beneficiation Process Flow, substantially the entire crushing reaction from each of the movable jaws is imposed upon the ecentric, with only relatively small forces being imposed upon the links, and, moreover, such forces as are carried to the links are transmitted to them through the long lever arm provided by the pitman extensions, so that the actual forces exerted upon the links and their respective pivotal connections are very small. While this imposition of the force loads upon the eccentric requires the driver and its bearings to be of sturdy construction, the strength requirements for these parts are not excessive in a secondary Crusher, and the slight additional weight of the driver necessitated by this requirement is made up for in the relative lightness of the guide means made possible because of this feature, and moreover results in an apparatus having a desirably low center of gravity.
  
  It will be noted that the fixed jaws in the crusher shown in the acompanying drawings have relatively fiat working faces and are disposed ata substantial angle to the horizontal, while the movable jaws, as mentioned above, have curved crushing faces. The throat defined by jaws of this shape is particularly advantageous since it affords a gradual transition from its widest to its narrowest point which takes full advantage of the orbital motion of the jaws. The slight downward convergence of the movable jaws on the pitman enables the fixed jaws to be set at an angle sufficiently close to vertical so that mud will not tend to cling to the crushing faces of the jaws.

   

  <div class="cArrow"> </div><div class="cContentInner">The paths of three points along the height of the movable jaws are diagrammed at 53, 54 and 55, respectively, in Figure 3. It will be seen that a point midway between the top and bottom edge of each movable jaw will follow a slightly elliptical orbit 54 corresponding very nearly to the orbit of the eccentric axis of the driver, but modified, of course, by the pitman guide links, so as to be noncircular.<a href="http://www.goodcrusher.com/construction/gabbro-crushing-beneficiation-process-flow.html" rel="nofollow">Gabbro Crushing Beneficiation Process Flow</a>. The lower edge of each jaw likewise follows an orbital path, designated by 55, which, however, has a slightly larger component of horizontal motion because of its disposition below the axis of the pitman bearings; while the upper edges of the movable jaws will also follow orbital paths 53 which, while having less horizontal motion component than the orbits 54 of the midpoints of the jaws, will nevertheless be sufficiently circular as to be very effective in grinding and crushing stones at the entrances to the throats 36. <br /> <br /> Particular attention is directed to the fact that the axis of the pitman bearings 14 in which the eccentric is journaled lies in a horizontal plane which intersects the movable jaws midway between their top and bottom edges. As a result of this disposition of the pitman bearing axis, the reaction forces against the movable jaws are substantially balanced along their height, that is, substantially as much reaction force is imposed upon each movable jaw above the pitman axis as below it, with the result that little or no turning couple is imposed upon the jaws to tend to rotate the pitman about the pitman bearing axis. In consequence of this balance of the forces upon the movable jaws about the driver axis,<a href="http://www.goodcrusher.com/construction/granite-crushing-beneficiation-process-flow.html" rel="nofollow">Granite Crushing Beneficiation Process Flow</a>, substantially the entire crushing reaction from each of the movable jaws is imposed upon the ecentric, with only relatively small forces being imposed upon the links, and, moreover, such forces as are carried to the links are transmitted to them through the long lever arm provided by the pitman extensions, so that the actual forces exerted upon the links and their respective pivotal connections are very small. While this imposition of the force loads upon the eccentric requires the driver and its bearings to be of sturdy construction, the strength requirements for these parts are not excessive in a secondary Crusher, and the slight additional weight of the driver necessitated by this requirement is made up for in the relative lightness of the guide means made possible because of this feature, and moreover results in an apparatus having a desirably low center of gravity. <br /> <br /> It will be noted that the fixed jaws in the crusher shown in the acompanying drawings have relatively fiat working faces and are disposed ata substantial angle to the horizontal, while the movable jaws, as mentioned above, have curved crushing faces. The throat defined by jaws of this shape is particularly advantageous since it affords a gradual transition from its widest to its narrowest point which takes full advantage of the orbital motion of the jaws. The slight downward convergence of the movable jaws on the pitman enables the fixed jaws to be set at an angle sufficiently close to vertical so that mud will not tend to cling to the crushing faces of the jaws.</div>

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