Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
  • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
  • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
  • B02C13/095—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate with an adjustable anvil or impact plate
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/26—Details
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/26—Details
  • B02C13/30—Driving mechanisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C25/00—Control arrangements specially adapted for crushing or disintegrating

Definitions

• the present invention relates to impact mills with a rotor positioning device.
• Impact crushers are generally intended to be installed in quarries or mines for the dimensional reduction of aggregates or ores. They comprise a grinding chamber containing a rotor which is provided with strikers regularly arranged on its periphery, and at least one shock screen which at its upper end is pivotally mounted on a hinge connected to the frame of the grinder.
• the shock screen can be pivoted with a tuning ram to move the bottom end of the screen closer to or away from the rotor to define between the bottom end of the screen and the end. free of one of the strikers, a gap R (see Figure 1) which determines a given grain size.
• the aggregates are introduced through a feed opening and are struck by the strikers secured to the rotor and sent against the shock shield or screens to see their reduced dimensions. Once introduced, the aggregates undergo this process several times until they reach the size of the adjustment gap R between the lower end of the last shock screen and the end of the strikers. Once this dimension is reached, the reduced granulate passes between the strikers and the screen and is evacuated towards the exit.
• the distance R between the end of the strikers and the edge of the last shock screen, the one which is closest to the rotor, is modified by the wear of the strikers and must therefore be readjusted periodically to keep a regular grain size. It must also be pre-set before each grinding process to be adjusted to the desired output size.
• this adjustment is done manually by the operator, who must first, when stationary, turn the rotor until it has the end of one of the strikers as close as possible. from the bottom end of the last shock screen, then make a manual measurement of the distance between this end of the firing pin and that of the screen. It can then either perform a manual adjustment with screws and nuts, or act on the hydraulic unit controlling the output of the cylinder. positioning the screen until you get the desired distance.
• the patent FR2837407 of the applicant proposes means for adjusting the deviation R without direct manual intervention by the operator by indexing the position of the rotor for adjustment.
• the percussion mill is provided with a rotor positioning device which comprises a prism-shaped indexing piece, coaxial and fixed in rotation with the rotor and having a number of projecting ridges equal to the number of strikers.
• This indexing piece may abut against an indexing plate mounted at the end of an indexing ram rod to cause rotation of the rotor to a position in which the end of the striker corresponding to the edge is in the maximum approach position with the shock screen.
• the screen is rotated by means of the adjusting cylinder until it reaches the end of the firing pin so as to define the origin of the adjustment of the gap R between these two elements, and subsequently adjust the gap for the desired particle size.
• This last operation is particularly delicate since to change a striker it will rotate the rotor so that the striker to be changed is directed upwards, substantially in a vertical position, to be either out of the top, or slid on the side, after the rotor shaft has been locked in rotation in this position.
• This operation becomes particularly difficult when the striker change is not in the desired substantially vertical position when the end of one of the other strikers is in front of the lower end of the last shock screen. This is, among other things, the case when the number of strikers is 5, 6 or 7.
• the object of the invention is to overcome the disadvantages of known mills with the characteristics of the mill according to the invention.
• the object of the invention is an impact crusher comprising a frame defining a grinding chamber containing a rotor provided with strikers regularly arranged on its periphery, and at least one shock screen which, at its upper end, is pivotally mounted on an articulation connected to the frame of the mill, so as to be pivoted by means of a respective adjustment jack to move the lower end of the shock shield towards or away from the rotor so as to define, between the lower end of the the impact screen and the free end of one of the strikers, a gap which determines a given grain size
• the mill further comprising a rotor positioning device comprising indexing means for positioning the end of the rotor; one of the strikers in a position of maximum approximation with the shock screen in order to adjust said deviation, characterized in that said positioning device comprises a motorcycle A driver driving a pinion adapted to engage a toothed wheel disposed at one end of the rotor shaft and rotatably connected therewith to rotate the rotor from a rest
• the motor-gearbox is mounted displaceable in translation between a first position in which said pinion is released from engagement with said gear wheel and a second position in which said pinion is engaged with said gear wheel;
• the geared motor is moved in translation by means of a jack
• a stop is provided to stop the translation of the gear motor when said pinion engages said gear
• end-of-travel detectors are arranged so as to detect the extreme positions of displacement in translation of the motor-geared motor
• said detectors are limit switches, or inductive sensors
• the gear motor is fixed on a movable plate along a slide;
• said slideway comprises guide rods
• said indexing means comprise locating means arranged at one end of the rotor shaft and detected by a fixed sensor, the number of said locating members being equal to the number of strikers;
• said sensor is an induction sensor sensitive to the locating members
• the indexing means comprise a second fixed sensor angularly offset from the first sensor to stop the rotation of the rotor when a striker is directed substantially vertically upwards.
• FIG. 1 is a sectional side view of a mill according to the invention provided with a rotor with four strikers;
• FIG. 2 is a sectional side view of a mill according to the invention provided with a rotor with six strikers;
• FIG. 3 is a partial perspective view illustrating the device for positioning and indexing the rotor in the non-actuated position thereof;
• FIG. 4 is a partial perspective view illustrating the device for positioning and indexing the rotor in the actuated position thereof.
• FIG. 5 is a side view illustrating in more detail the rotor positioning and indexing device comprising a gear motor mounted on a translatable plate in translation.
• identical or equivalent elements will bear the same reference signs.
• the impact mill shown in section in Figure 1 comprises a frame 1 'defining a grinding chamber 1 in which a rotor 2 is mounted integral with a rotation shaft 3 driven by a motor (not shown).
• the rotor 2 rotates in the example shown in the direction indicated by an arrow in Figure 1. It is provided with strikers 4 evenly distributed on its periphery.
• the rotor carries four strikers 4, one is hidden behind a mechanism which will be described in detail later.
• shock shields 5 and 6 are arranged in the grinding chamber 1.
• the shock shields 5 and 6 are at their respective high end pivotally mounted on a hinge defined by a respective pivot 7, 8 so as to be able to pivot around that thanks to adjustment cylinders 9 or 10 respectively to bring their free ends closer to or away from the rotor 2.
• the grain size to be obtained for the material to be ground is adjusted by moving the low end of the last lowest screen 5 closer to the rotor periphery, as required, in order to obtain a gap R by which the granulate can pass after reaching the adjustment dimension determined by this deviation.
• the process of adjusting the particle size is carried out as follows. With the machine stationary, the rotor must be rotated until the end of any striker 4 is found opposite the low end of the last lowest screen 5 or the end of the rotor. selected screen, in a setting position.
• a rotor positioning device is provided by means of which the rotor is slowly turned towards this adjustment position to be stopped by means of an indexing device.
• the operator then actuates the adjustment jack 10 to bring the lower end of the lower shock screen 5, the free end of the striker vis-à-vis until they come into contact . He thus determined the origin or the point 0 of the measurement of the deviation R. He then actuates the adjustment jack 10 in the opposite direction until his instrument for measuring the displacement of the jack indicates to him the value corresponding to the desired gap R, that is to say, the given particle size.
• a device for positioning the rotor 2 is associated with the impact mill. It includes indexing means which will be described in more detail later. These means make it possible to position the end of one of the strikers in a position of maximum approximation with the shock screen in order to adjust said deviation.
• this positioning device comprises a geared motor 11 which is preferably a hydraulic geared motor.
• the outgoing shaft (not shown) of this geared motor 11 drives a pinion 12 adapted to engage with a ring gear or gear 13 disposed at one end of the rotor 2 and integral in rotation thereof.
• the pinion 12 is fixed directly on the output shaft of the geared motor 11.
• the motor-gear reducer 11 is movable in translation between a first position in which the pinion 12 is released from the socket with the gear wheel 13 and a second position engaged therewith.
• the first position is illustrated in FIGS. 1 to 3 and corresponds to a deactivated position of the geared motor 11 enabling the rotor to be driven by its main rotary drive motor (not shown) for the normal operation of the mill.
• the second position is illustrated in Figure 4 and corresponds to an activated position of the motor-gear reducer 11 for driving in rotation at reduced speed to adjust the gap R between the lower end of the shock screen 5 and the free end of one of the strikers or for the change of strikers 4.
• the motor-gear reducer 11 is fixed on a plate 14 which is itself mounted displaceable in translation on a slide which in the illustrated example comprises guide rods 15 extending in guide tubes 16 .
• the motor-gear reducer 11 is according to another characteristic of the invention moved in translation with the aid of a control cylinder 17 which is preferably a hydraulic cylinder.
• An adjustable stop 18 with a screw and a stop nut is provided for adjusting the translational travel of the geared motor 11 and the meshing of the gear 12 on the gear wheel 13.
• end-of-travel detectors 19, 20 are advantageously arranged so as to detect the extreme positions of displacement in translation of the geared motor 11 to stop deployment or the retraction of the rod of the cylinder 17 when these extreme positions are reached. .
• the position in which the pinion 12 is engaged with the toothed wheel 13 is maintained by the fact that during this time, the hydraulic pressure is always exerted.
• the pinion 12 can thus come into engagement with the toothed wheel 13 to drive the rotor 2 in rotation from a rest state thereof to the maximum approach position of one of the strikers 4 with respect to the bottom end of the lowest shock screen 5.
• the indexing means comprise a fixed sensor 21 fixed near an end of the shaft 3 of the rotor and able to detect the passage of register members 22 regularly spaced on a ring 23 concentric with the shaft 3 of the rotor 2 and rotatably mounted therewith.
• the number of locating members 22 corresponds to the number of strikers 4.
• the sensor 21 is preferably an induction sensor sensitive to the material of the register members 22.
• the sensor 21 is connected to means for controlling the motor reducer 11 in order to stop its rotation each time a register member 22 is detected by the sensor 21.
• the gap R between the lower end of the lower screen 5 and the free end of the firing pin 4 which then faces it can then be adjusted as described above.
• the positioning device according to the invention is also intended to be used to position the rotor 2 for the change of the strikers 4 so that one of the strikers 4 is always directed substantially vertically upwards and then removed from above or from the side.
• the angular distance between the strikers is 90 °, which has the consequence that one of the strikers will then be automatically directed substantially vertically upwards. when the preceding striker is disposed substantially horizontally with its free end facing the lower end of the screen 5.
• the strikers are 5, 6 or 7.
• An example of a rotor 2 carrying 6 strikers 4 is shown in Figure 2.
• the angular distance between the strikers is 60 °.
• a second fixed sensor 24 is fixed below the first sensor 21 and shifted therefrom 30 ° so that when a striker stops in front of the second sensor 24, one of the strikers will be directed substantially vertically upwards.
• the second sensor 24 may also be disposed above the first sensor 21 and offset by 30 ° thereof to define an angular distance of 60 ° with respect to the next striker which will then be directed substantially vertically to the high.
• the entire assembly comprising the positioning device with the geared motor 11 and the hydraulic cylinder which controls its displacement in translation can advantageously be arranged in a protective housing 25 as schematically illustrated in FIGS. 4 and 5.
• a programmable logic controller or any other similar system may also be used to perform all the adjustment sequences automatically after having entered the adjustment of the difference R at the value desired by the operator.
• the invention is not limited to the examples illustrated and described, but the skilled person may consider variants without departing from the scope of the invention.
• the impact mill according to the invention may comprise a third shock screen and if it is desired to calibrate a second gap defined between its lower end and the ends of the strikers, simply add a sensor in order to proceed as described for the sensor 21.
• the percussion mill can thus comprise several sensors to ensure adjustments on several shock screens.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Grinding (AREA)
• Crushing And Pulverization Processes (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 2011
  • 2011-01-31 FR FR1150701A patent/FR2970882B1/fr active Active
• 2012
  • 2012-01-24 PT PT127053643T patent/PT2670531E/pt unknown
  • 2012-01-24 EP EP12705364.3A patent/EP2670531B1/fr active Active
  • 2012-01-24 US US13/977,243 patent/US9289771B2/en active Active
  • 2012-01-24 MX MX2013006675A patent/MX352761B/es active IP Right Grant
  • 2012-01-24 CA CA2819387A patent/CA2819387C/fr active Active
  • 2012-01-24 ES ES12705364.3T patent/ES2537533T3/es active Active
  • 2012-01-24 WO PCT/FR2012/050148 patent/WO2012104521A1/fr not_active Ceased

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