EP0236529B1 - Rotierende Form einer Brikettiermaschine - Google Patents

Rotierende Form einer Brikettiermaschine Download PDF

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Publication number
EP0236529B1
EP0236529B1 EP86103369A EP86103369A EP0236529B1 EP 0236529 B1 EP0236529 B1 EP 0236529B1 EP 86103369 A EP86103369 A EP 86103369A EP 86103369 A EP86103369 A EP 86103369A EP 0236529 B1 EP0236529 B1 EP 0236529B1
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EP
European Patent Office
Prior art keywords
end wall
mold
segments
segment
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86103369A
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English (en)
French (fr)
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EP0236529A2 (de
EP0236529A3 (en
Inventor
Ralph William Weggel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hosokawa Bepex GmbH
Original Assignee
Bepex GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to US06/702,906 priority Critical patent/US4589831A/en
Application filed by Bepex GmbH filed Critical Bepex GmbH
Priority to DE8606953U priority patent/DE8606953U1/de
Priority to EP86103369A priority patent/EP0236529B1/de
Priority to DE8686103369T priority patent/DE3673396D1/de
Priority to AT86103369T priority patent/ATE55319T1/de
Publication of EP0236529A2 publication Critical patent/EP0236529A2/de
Publication of EP0236529A3 publication Critical patent/EP0236529A3/en
Application granted granted Critical
Publication of EP0236529B1 publication Critical patent/EP0236529B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/16—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using pocketed rollers, e.g. two co-operating pocketed rollers
    • B30B11/165—Roll constructions

Definitions

  • the present invention relates to briquetting machines and, in particular, to rotary molds or briquetting rolls, respectively and removable mold segments therefore.
  • Briquetting machines are known devices which generally comprise a pair of wheel-like rolls geared together to cooperatively turn in opposing directions on parallel axes with the peripheral surfaces of each respective roll positioned in linear axial alignment with one another so that material introduced to the rolls is captured by the molding surfaces of the rolls and compressed into briquets by passage through the adjoining molding surfaces.
  • Briquetting apparatus and techniques have been used to compact and/or mold materials at both low temperatures and pressures as well as high temperatures and pressures for materials such as charcoal, iron ore, metal chips, etc.
  • high pressure briquetting at elevated temperatures places additional demands upon the commonly employed rotary molds.
  • rotary mold segments are subject to cracks from stress and to wear due to rocking and abrasion of the mold surface by the material to be molded.
  • U.S. Patent No. 3,907,485 describes replaceable mold segments adapted for placement upon the periphery of a cylindrical central member. These mold segments are affixed to the cylindrical central member by fasteners engaging projections extending outwardly from the side walls of the mold segment. This configuration of the mold segment cooperates with the central member such that radial compression forces applied to the mold segment are transmitted through the bottom surface of the mold segment, which bottom surface is coplanar with the projections from the side walls. The application of such forces to the mold segments produces bending stresses in the mold segment that can result in premature failure due to cracking of the strong part brittle mold segment.
  • U.S. Patent No. 4,306,846 describes the use of a symmetrically shaped replaceable mold segment for a briquetting roll. These segments have side walls including upper and lower portions, the upper portions of which are disposed at an angle convergent with respect to a top working surface, and the lower portions of said side walls are divergent with respect to the axis of rotation of the rolls.
  • U.S. Patent No. 4,097,215 describes a briquetting press roll which comprises a cylindrical core having a regular polygonal cross-section and a plurality of equal planar sections around its peripheral surface to which are attached a plurality of removable mold segments each having a flat bottom surface with said segments being attached by retaining rings.
  • prior art segments suffer from wear due to rocking of the segment in its seat. This movement of a segment with respect to its seat occurs as a force travels across the arcuate molding surface of the segment causing the segment to pivot due to aberrations in surface contact. Since this rocking movement causes undesirable wear, attempts are made to minimize rocking in order to prolong segment life.
  • One way to minimize rocking is to reduce the surface aberrations which act as "pivot points" for rocking. Machining of contact surfaces between segment and core seat will reduce rocking.
  • a further object of this invention is to provide segments resistant to wear, especially wear caused by rocking, and which are easy and economical to machine.
  • a further object of the invention is to provide a keyless segment/core combination which resists wear and breakage from rotational forces.
  • the present invention reduces machining time and costs by allowing machining of flat surfaces which include at least one right angle between two flat planar surfaces.
  • Use of a right angle allows utilization of uncomplicated fixtures in the machining process. Simplification of machining is especially desired to lower the time and cost of such operations in those countries having high labor costs.
  • a preferred embodiment comprises a rotary mold segment of truncated sectorial shape (hereinafter “tifht angeie preferred embodiment") which segment comprises a top arcuate molding surface, a bottom surface, two opposing end walls connecting the top surface and the bottom surface, two opposing end walls connecting the top surface and the bottom surface, whereby said connections define a right angle with respect to a line drawn tangent to the top arcuate surface at each respective connecting end, and said segment further having a connection between one end wall with the bottom surface which defines a right angle, and further comprising two opposing side walls connecting the respective sides of the top, bottom and end walls.
  • tifht angeie preferred embodiment a rotary mold segment of truncated sectorial shape
  • a line drawn tangent to the arcuate surface at each respective connecting end is meant the tangent line at that end point presuming a continuation of the preceding arcuate curve. It is not necessary that each and every object listed above be found in all embodiments of the invention. It is sufficient that the invention may be advantageously employed when compared to the prior art.
  • the present invention also comprises a rotary mold having a roll shaft with a core portion adapted to receive the plurality of removable mold segments and fastening means for removably attaching mold segments to said core and a plurality of the above- described mold segments.
  • a rotary mold having a roll shaft with a core portion adapted to receive the plurality of removable mold segments and fastening means for removably attaching mold segments to said core and a plurality of the above- described mold segments.
  • Fundamental to the instant invention is the design of a replaceable mold segment having an angle from about 80 to 90 degrees between the generally planar bottom surface and the longer end wall of said segment.
  • Each mold segment comprises a body having a bottom planar surface which mates with a corresponding surface on the sawtooth-shaped core portion of a roll shaft.
  • the bottom right angular surface formed by one end wall with the bottom portion of the segment mates with the corresponding right angular L-shaped peripheral portion of the core surfaces.
  • a rotary mold 10 suitable for use with a second similar rotary mold according to known techniques in a briquetting machine (not shown) is depicted.
  • the rotary mold 10 comprises a roll shaft 11 adapted for rotation within a briquetting machine in coaxial alignment with a similar roll shaft, both of which shafts possessing a plural ity of mold segments 12 positioned about the periphery of a roll core 13 which is integral with said shaft 11. Also integral with said roll core is roll radius 14a and roll core radius 14b.
  • Shaft 11 also contains bearing cone surfaces 15a and 15b positioned on either side of said roll core 13.
  • Roll shaft 11 may be equipped with access means 16 for temperature control.
  • Each rotary mold segment 12 contains three complete mold cavities 17 and two separate cavity.halves 18, at either end of each segment 12.
  • Each segment member is adapted to cooperate with a segment member adjacent thereto in forming a complete mold cavity in the assembled roll.
  • each segment member in Figure 1 has three complete mold cavities formed in the center and has half pockets formed thereon at the ends.
  • a roll comprising a plurality of segments made according to the present invention may contain 12 to 16 segments.
  • the use of 12 segments provides a reduction in the number of machining operations and allows stronger fastening of segments to the roll core, while the use of 16 segments allows reduced costs with respect to modifying present roll cores and for production of segments from readily available stock materials.
  • fewer than 12 or greater than 16 segments may also be employed, depending upon roll size. Rolls of any diameter are contemplated.
  • FIG. 2 an end elevational view of rotary mold 10 including roll shaft 11 taken about line 2-2 of Figure 1 is depicted.
  • Roll shaft 11 supports roll core 13 about which are attached twelve roll mold segments 12 which are removably attached by fastening means such as sunken screws 19 treated with a suitable lubricant such as a solid film molybedenum disulfide lubricant (not shown).
  • a suitable lubricant such as a solid film molybedenum disulfide lubricant (not shown).
  • Each segment 12 comprises two end walls 20 and 21 connecting a top arcuate working surface 22 with a bottom surface 23.
  • each end wall 20 and 21 is coplanar with axially disposed planes 24a and 24b which extend from the axis of rotation 28 to rotary mold perimeter 26.
  • angle ⁇ may vary to accommodate a greater or fewer number of segments.
  • approximate is meant an angle sufficient to create the segment size desired for the particular roll core.
  • remachining is meant the process whereby working surface 22 may be machined to re-obtain a sharp mold cavity periphery thereby extending the useful life of the segment 12. Remachining will remove aberrations in the working surface 22 of segments 12 and thereby reduce the diameter of the rotary mold. Some excess material may be left on the segment working surface initially (before first use) to allow for remachining after wear from operation.
  • the segments wil be constructed of a wear-resistant metal such as steel.
  • the particular material used to construct the segments 12 will depend primarily upon the intended applications for the particular rotary mold. Generally, steels and irons having application-dependent compositions will be employed.
  • End walls 20 and 21 may also be defined for the right angle preferred embodiment by reference to imaginary lines drawn tangent to the top arcuate surface 22 at each point 27a connecting top surface 22 to either end wall 20 and 21.
  • Two such tangent lines 29 form right angles a with each respective end wall 20, 21.
  • the connections 27a between each end wall 20, 21 with the top arcuate surface 22 defines a right angle with respect to a line 29 drawn tangent to the arcuate top surface 22 at each respective end of end walls 20 and 21.
  • segment 12 may be defined by a ratio of the length of the longer end wall 21 to the length of the shorter end wall 20 and the angle between the longer end wall 21 and the bottom surface 23.
  • a suitable range of such end length ratios is 22:16 to 17:6; with a preferred range being 18:11 to 16:9.
  • the connection 27b between end wall 21 and bottom surface 23 forms an angle p.
  • a suitable range for would be from about 80 to about 90 degrees. When p is 90 degrees or less, then tipping or rotational action about the corner forming the angle is reduced.
  • Roll core 13 and attached segments 12 will rotate during normal operation in the direction shown by arrow A.
  • the indicated direction of rotation in combination with the design of the segments 12 and segment attachment to the roll core 13 reduces wear due to rocking.
  • novel segment is adapted to withstand rotational forces presented as the roll moves from the shorter segment end to the longer segment ends.
  • the sawtooth design of the perimeter of roll core 13 resists rotational forces exerted against the segments 12 relative to core 13.
  • the torque produced during acceleration, deceleration and use of the rotary mold operates to cause the segments to slip relative to the core perimeter.
  • this "slippage" is counteracted by the sawtooth design which, when the mold is rotated as indicated, decreases wear while providing a substantially flat bottom surface without necessitating the use of keys or other core and/or segment weakening grooves.
  • the mating roll which runs adjacent to the roll depicted will be adapted to rotate in a clockwise direction since roll 11 is shown rotating in a counterclockwise direction.
  • both rolls will rotate in the direction shown by arrow A with respect to the positioning of the segments, i.e., while both rolls will turn in opposite direction on parallel axes, nonetheless, the segments on each roll will be positioned so that as each separate segment passes a chosen point during rotation, the shorter end surface of the segment will pass that point first. Reversal of the direction of rotation depicted will normally occur only after unloading in order to remove a jam or plug and then only for a short time.
  • rotary mold segment 12 and roll core 13 are shown in a sectional view taken about the line 3-3 of Figure 1.
  • Segment 12 has a top surface 22 (with raised mold cavity 17) connected to bottom surface 23 by side walls 30 and 31.
  • Segment 12 is attached to planar core surface 32 in substantial coplanar alignment by a plurality of threaded screws 19, which are recessed below surface 22 and removably secured to core 13 through a plurality of holes 33a adapted to removably receive, align, and secure together segment 12 with core 13.
  • at least a portion of the holes 33a which extend into core 13 are threaded for connection with screws 19.
  • Alternative attachment means for removably fastening segments to a roll which means are well known in the art, such as clamp rings, may also be employed.
  • FIG 4 an exploded fragmentary perspective view depicting attachment of a segment 12 having a top surface 22 with raised mold cavity 17, side wall 31 and end wall 21 connected so that wall 21 forms an angle 8 with bottom surface 23.
  • Four holes 33a extend from top surface 22 through an otherwise solid segment body 12 through bottom surface 23. These holes 33a align with threaded holes 33b in roll core surface 32. Holes 33b extend a sufficient distance below surface 32 to provide adequate securing of segment 12 to core 13 when segment 12 is secured to core 13 by threaded screws 19a and 19b.
  • Screws 19a which secure segment 12 through a lesser segment thickness (such as that nearer side 20) and screws 19b (which are located nearer longer segment side 21) may be of lesser and greater length, respectively, to avoid weakening of the core roll by intersection of holes 33b between adjacent core surfaces 32.

Claims (11)

1. Rotierendes Formwerkzeug (10) bzw. Brikettierwalze einer Brikettiermaschine, mit einem Walzenschaft (11) mit einem Kernabschnitt (13) zur Aufnahme einer Vielzahl von lösbar befestigten Formwerkzeug-Segmenten (12) mit Formvertiefungen (17, 18), wobei die Formwerkzeug-Segmente eine obere, gekrümmte Formfläche (22) aufweisen, eine ebene Unterseite (23), zwei sich gegenüberliegende ebene Endwände (20, 21) mit radialer Ausrichtung zur Drehachse (28), welche die obere, gekrümmte Formfläche (22) begrenzen und die obere, gekrümmte Fläche (22) mit der Unterseite (23) verbinden, wobei die Verbindungen (27a) zwischen jeder Endwand (20, 21) und der oberen, gekrümmten Fläche (22) einen rechten Winkel (a) in bezug auf eine als Tangente an die obere, gekrümmte Fläche (22) angelegte Linie (29) bilden, zwei sich gegenüberliegende Seitenwände (30, 31), welche die entsprechenden Seiten der oberen, unteren und Endwand-Flächen miteinander verbinden, wobei die Formwerkzeug-Segmente in entsprechend gestalteten Kernausnehmungen in der Umfangsfläche des Kernabschnitts (13) aufgenommen sind, und Befestigungsmitteln (19a, 19b, 33a, 33b) zum lösbaren Verbinden der Formwerkzeug-Segmente mit den Kernausnehmungen, dadurch gekennzeichnet, daß die in bezug auf die Drehrichtung voreilende Endwand (20) kürzer als die nacheilende Endwand (21) ist, die Verbindungen (27b) zwischen den nacheilenden Endwänden (21) und den ebenen Unterseiten (23) einen Winkel (ß) von etwa 80 Grad bis etwa 90 Grad bilden, die die Formwerkzeug-Segmente (12) mit enger Anlage aufnehmenden Kernausnehmungen auf die Formwerkzeug-Segmente in bezug auf den Formwerkzeugkern (13) ausgeübten Drehkräften entgegenwirken.
2. Rotierendes Formwerkzeug nach Anspruch 1, dadurch gekennzeichnet, daß die Verbindung (27b) zwischen der nacheilenden Endwand (21) und der ebenen Unterseite (23) einen rechten Winkel bildet.
3. Rotierendes Formwerkzeug nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß das Verhältnis der Länge der längeren Endwand (21) zur Länge der kürzeren Endwand (20) etwa 22:16 bis 17:6 beträgt.
4. Rotierendes Formwerkzeug nach Anspruch 3, dadurch gekennzeichnet, daß das Verhältnis der Länge der längeren Endwand (21) zur Länge der kürzeren Endwand (20) etwa 18:11 bis 16:7 beträgt.
5. Rotierendes Formwerkzeug nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Kernabschnitt (13) einen die Formwerkzeug-Segmente (12) aufzunehmen vermögenden Sägezahn-Außenumfang aufweist, wobei sich die eine ebene Seitenfläche jedes Sägezahns durch die Drehachse (28) erstreckt, die andere ebene Seitenfläche (32) jedes Sägezahns mit der einen ebenen Seitenfläche jedes Sägezahns den Winkel (a) zwischen der nacheilenden Endwand (21) und der Unterseite (23) des Formwerkzeug-Segments (12) bildet.
6. Rotierendes Formwerkzeug nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Vielzahl von Formwerkzeug-Segmenten (12) zwischen 12 und 16 Formwerkzeug-Segmente umfaßt.
7. Rotierendes Formwerkzeug nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Formwerkzeug-Segmente (12) und die Kernausnehmungen, welche die Formwerkzeug-Segmente aufzunehmen vermögen, nutlos sind.
8. Segment (12) für ein rotierendes Formwerkzeug von der Gestalt eines schief abgeschnittenen Sektors für ein rotierendes Formwerkzeug bzw. eine Brikettierwalze einer Brikettiermaschine, mit einer oberen, gekrümmten Formfläche (12) mit Formvertiefungen (17), einer ebenen Unterseite (23), zwei sich gegenüberliegenden ebenen Endwänden (20, 21), welche die obere, gekrümmte Fläche (22) mit der Unterseite (23) verbinden, wobei die Verbindung (27a) zwischen jeder Endwand (20, 21) und der oberen, gekrümmten Fläche (22) einen rechten Winkel (a) in bezug auf eine als Tangente an die obere, gekrümmte Fläche (22) angelegte Linie (29) bildet, und zwei sich gegenüberliegenden Seitenwänden (30, 31), welche die zugehörigen Seiten der oberen, unteren und Endwand-Flächen miteinander verbinden, dadurch gekennzeichnet, daß die eine Endwand (20) kürzer als die andere Endwand (21) ist und die Verbindungslinie (27b) zwischen der anderen Endwand (21) und der Unterseite (23) einen Winkel (p) von etwa 80 Grad bis etwa 90 Grad begrenzt.
9. Segment (12) für ein rotierendes Formwerkzeug nach Anspruch 8, dadurch gekennzeichnet, daß die Verbindungslinie (27b) zwischen der anderen Endwand (21) und der Unterseite (23) einen rechten Winkel begrenzt.
10. Segment (12) für ein rotierendes Formwerkzeug nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß das Verhältnis der Länge der längeren Endwand (21) zur Länge der kürzeren Endwand (20) zwischen etwa 22:16 und 17:6 beträgt.
11. Segment (12) für ein rotierendes Formwerkzeug nach Anspruch 10, dadurch gekennzeichnet, daß das Verhältnis der Länge der längeren Endwand (21) zur Länge der kürzeren Endwand (20) zwischen etwa 18:11 und 16:7 beträgt.
EP86103369A 1985-02-19 1986-03-13 Rotierende Form einer Brikettiermaschine Expired EP0236529B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US06/702,906 US4589831A (en) 1985-02-19 1985-02-19 Removable mold segments for rotary molds
DE8606953U DE8606953U1 (de) 1986-03-13 1986-03-13
EP86103369A EP0236529B1 (de) 1986-03-13 1986-03-13 Rotierende Form einer Brikettiermaschine
DE8686103369T DE3673396D1 (de) 1986-03-13 1986-03-13 Rotierende form einer brikettiermaschine.
AT86103369T ATE55319T1 (de) 1986-03-13 1986-03-13 Rotierende form einer brikettiermaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8606953U DE8606953U1 (de) 1986-03-13 1986-03-13
EP86103369A EP0236529B1 (de) 1986-03-13 1986-03-13 Rotierende Form einer Brikettiermaschine

Publications (3)

Publication Number Publication Date
EP0236529A2 EP0236529A2 (de) 1987-09-16
EP0236529A3 EP0236529A3 (en) 1988-09-07
EP0236529B1 true EP0236529B1 (de) 1990-08-08

Family

ID=39618880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103369A Expired EP0236529B1 (de) 1985-02-19 1986-03-13 Rotierende Form einer Brikettiermaschine

Country Status (3)

Country Link
EP (1) EP0236529B1 (de)
AT (1) ATE55319T1 (de)
DE (2) DE8606953U1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4886441A (en) * 1987-11-06 1989-12-12 Food Equipment Engineering, Inc. Apparatus for forming three dimensional food products
EP1229885B1 (de) 1999-10-13 2004-05-19 Novo Nordisk A/S Verfahren zum herstellung von medizinische formkörpern

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958902A (en) 1958-02-21 1960-11-08 Kloeckner Humboldt Deutz Ag Roller press for the briquetting of ore, coal or similar materials
USRE28581E (en) * 1970-11-10 1975-10-28 Roller-type press
US3907485A (en) 1973-03-05 1975-09-23 K R Komarek Inc Segmented briquetting roll structure
US4097215A (en) 1977-05-12 1978-06-27 K. R. Komarek, Inc. Segmented briquetting roll
US4261692A (en) * 1979-11-01 1981-04-14 Davy Mckee Corporation Roll press for forming briquettes
US4306846A (en) 1980-07-25 1981-12-22 K. R. Komarek Inc. Briquetting roll and mold segment therefor

Also Published As

Publication number Publication date
ATE55319T1 (de) 1990-08-15
EP0236529A2 (de) 1987-09-16
EP0236529A3 (en) 1988-09-07
DE8606953U1 (de) 1987-04-09
DE3673396D1 (de) 1990-09-13

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