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
  • B02C4/00—Crushing or disintegrating by roller mills
  • B02C4/28—Details
  • B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members

Definitions

• the invention relates to a roller mill for crushing the brittle grinding with two mutually pressed grinding rollers, which are each rotatably mounted in two jewels, wherein the two jewels one of the two grinding rollers are guided relative to the two jewels of the other grinding roller, and between two opposite jewels at least one spacer is provided for adjusting a grinding gap between the grinding rollers to prevent contact of the counter-rotating roller surfaces.
• a roller mill according to the preamble of claim 1 is known for example from DE 43 20 668 AI. Due to the grinding process, wear occurs on the roll surfaces, so that with a fixed adjustment of the spacers the Grundmahlspalt between the two rolls would be increasingly larger, which has a negative effect on the startup and Abfahrlui. To prevent this, generally adjustable spacers are provided between the adjacent jewels.
• the DE 43 20 668 AI proposes alternatively that the spacers are formed like a ram and axially movable accommodated and guided in each associated fixed bearing stone in a bearing bore. In this way, a stepless adjustment of the spacers is possible, so that the maximum wear layer thickness of the rollers can be fully utilized.
• the plunger-like spacers of DE 43 20 668 AI lead in case of misalignment of the grinding rollers between very high edge pressures Spacer and the corresponding counter surface on the bearing block. If the point of contact between the spacer and the bearing block is also sufficiently far away from the center axis of the bearing block plane, a very high restoring moment is induced on the bearing located in the bearing block.
• the invention is therefore based on the object, the spacers to be arranged so that the lowest possible restoring moment acts on the bearing located in the bearing stone.
• two mutually pressed grinding rollers are provided, which are each rotatably mounted in two jewels, the two jewels one of the two grinding rollers relative to the two jewels of the other Grinding roller are movably guided, and between two opposite bearing stones at least one spacer is provided for adjusting a Mahlspalts between the grinding rollers.
• the spacers are movably supported on the two opposite bearing stones.
• the movable support ensures that the jewels can follow an operational misalignment of the grinding rolls and that the impact of the bearing surfaces coming into contact with the bearing surfaces of the spacers takes place in an area defined by the holder, which preferably has a small distance from the median plane of the corresponding jewels.
• the spacers are held by retaining means elastically on the two opposite bearing blocks.
• the support means may be at least two at each jewel have cooperating spring elements, which are each supported at one end to the bearing block and cooperate with the other end with an end portion of the spacer.
• the two cooperating spring elements are arranged in particular on one side of the median plane of the bearing stone.
• the support means on each jewel on at least two cooperating spring elements, which are each supported at one end to the bearing block and hold at the other end a guide pin, wherein the spacer in its two coming into contact with the bearing blocks each end a recess has to receive the guide pin.
• the support means on each bearing stone in each case at least two cooperating spring elements, which are each supported at one end to the bearing block and having at the other end a sliding element which holds the spacer elastic.
• the grinding rollers each have an axis of rotation and the bearing blocks each have a central plane, wherein the axes of rotation are aligned in any position of the bearing blocks perpendicular to the respective center plane of the associated bearing block.
• the spacer has opposite contact surfaces coming into contact with the bearing blocks, the spacer being supported on the bearing block in such a way that the contact surface cooperating with this bearing block is in contact with the bearing block in the vicinity or in the region of the center plane of the bearing block comes. The touch contact between
• Spacer and jewel is preferably at most 10 mm, preferably at most 3 mm, away from the median plane of the jewel.
• the contact surfaces of the spacers which come into contact with the bearing blocks are curved, wherein the curvature is preferably oriented in such a way that it rotates during a rotation opposite bearing stones relative to each other to a rolling of justifyfiumblee on the standing in contact with this bearing stone comes. Due to the curved contact surfaces, impermissibly high surface pressures between the contact surfaces of the spacer and the associated bearing block can be avoided.
• the spacer is adjustable in length, for example, by adding or removing intermediate plates in a conventional manner.
• Fig. 1 is a schematic side view of the roller mill
• Fig. 2 is a schematic plan view of the roller mill
• Fig. 3 is a schematic plan view of the roll mill in a misalignment of
• Fig. 4 is a detail view of a spacer according to a first
• FIG. 5 is a sectional view taken along the line V-V of Fig. 4,
• Fig. 6 is a detail view of a spacer according to a second
• Fig. 7 is a detail view of a spacer according to a third
• Fig. 8 is an enlarged view of the spacer according to the first
• the roll mill shown in Figures 1 and 2 is used for crushing of brittle material, such as cement raw material, cement clinker, ores or the like, so relatively brittle and highly abrasive bulk materials. It essentially comprises two grinding rolls 1, 2 which are rotatably mounted in bearing stones 3 and 3 'or 4 and 4' via corresponding bearings 7 and 7 'or 8 and 8'.
• the grinding roller 1 is pressed via corresponding cylinder 10 against the other grinding roller 2.
• the cylinders 10 are supported on a corresponding pressure bar 11. So that the second roller can be supported against the frame, this is on the opposite side by a corresponding
• the holder of the spacer 5 is shown in a misalignment of the grinding roller 1 of FIG. 3.
• a special feature of the spacers is that the contact surfaces 5 a, 5 b coming into contact with the bearing stones 3, 4 are curved and that the spacer 5 comes into contact with the bearing stones 3, 4 in the region of the median plane 3 a and 4 a ,
• the spacer 5 is held by means of spring elements 13a, 13b, 13c and 13d in the region of the median plane 3a and 4a of the jewels 3 and 4.
• the spring elements are fastened with one end to fastening strips 14a, 14b, 14c, 14d on the bearing block 3 or 4 and are in contact with the other end with a guide pin 15a or 15b.
• the spring elements are fastened to sleeves 16a, 16b at their ends coming into contact with the guide pins 15a, 15b.
• the spacers 5, 5 'each have a recess 5c, 5d for receiving the guide pins 15a, 15b in the two curved end regions 5a, 5b which come into contact with the bearing blocks.
• the guide pins are loosely guided in the recesses and stand beyond the width of the spacer 5 and stuck with the protruding areas in the sleeves 16a, 16b.
• the spacer 5 is rotatably supported relative to the bearing blocks but still centrally to the median planes 3a, 4a of the jewels 3, 4.
• the minimum grinding gap 6 as shown in FIG. 3 is maintained by the spacer 5 'between the bearing blocks 3' and 4 ', while the position of the guide pin 15a and 15b may change.
• the point of contact between the spacer and bearing stone is a maximum of 10 mm, preferably at most 3 mm from the median plane 3 a and 4a of the jewel 3 and 4, respectively.
• the guide pins can also be formed as pins 15c, 15d fixedly connected to the spacer 5, against which the spring elements engage.
• An increased distance between opposite bearing blocks in this case leads to a corresponding expansion of the spring elements.
• Fig. 7 shows yet a third embodiment for the movable mounting of the spacers.
• the ends of the spring elements are provided with sliding shoes 17a, 17d, which are in contact with the spacer 5 and hold it centrally between the fastening strips 14a, 14b or 14c, 14d.
• the rolling movement requires that the contact line formed by the curved contact surface 5a, 5b and the bearing stone plane in contact therewith, be away from the vertical median plane of the jewels.
• a certain ratio between the radius R of the contact surfaces 5 a, 5 b and the length L of the spacer 5 must be taken into account in the design (see FIG. 8).
• the ratio between the length L and the radius of curvature R it has proven to be expedient for the ratio between the length L and the radius of curvature R to be in the range from 0.5 to 1.2.
• the spacer element Since it is necessary due to wear, the set by the spacer 5 minimum gap 6 between the rollers 1, 2, the spacer element is designed so that, in a conventional manner, in length, for example by adding or removing intermediate plates 18 can be changed or adapted. Due to the curved contact surfaces 5 a, 5 b and the movable support of the spacer 5 impermissibly high surface pressures caused by corresponding edge pressures between the contact surface of the spacer and standing in contact with this bearing stone can be avoided.
• the spacer is supported so that it upon impact of the justifyfiumbleen 5 a, 5b impinges on the corresponding bearing stone directly or small distance from the vertical median plane of the jewel.

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

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• 2012
  • 2012-04-24 DE DE201210103590 patent/DE102012103590B4/de active Active
• 2013
  • 2013-02-20 WO PCT/EP2013/053359 patent/WO2013159947A2/fr not_active Ceased

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