EP2561981A2 - Convoyeur à vis - Google Patents

Convoyeur à vis Download PDF

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Publication number
EP2561981A2
EP2561981A2 EP12176955A EP12176955A EP2561981A2 EP 2561981 A2 EP2561981 A2 EP 2561981A2 EP 12176955 A EP12176955 A EP 12176955A EP 12176955 A EP12176955 A EP 12176955A EP 2561981 A2 EP2561981 A2 EP 2561981A2
Authority
EP
European Patent Office
Prior art keywords
conveyor
screw
duct
wear element
inlet
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.)
Withdrawn
Application number
EP12176955A
Other languages
German (de)
English (en)
Other versions
EP2561981A3 (fr
Inventor
Udo Leipert
Daniel Mangott
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.)
Thoeni Industriebetriebe GmbH
Original Assignee
Thoeni Industriebetriebe 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
Application filed by Thoeni Industriebetriebe GmbH filed Critical Thoeni Industriebetriebe GmbH
Priority to EP12176955.8A priority Critical patent/EP2561981A3/fr
Publication of EP2561981A2 publication Critical patent/EP2561981A2/fr
Publication of EP2561981A3 publication Critical patent/EP2561981A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/121—Screw constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/127—Feed means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/26—Permeable casings or strainers

Definitions

  • the present invention relates to the field of screw conveyors and screw presses.
  • EP 0 790 122 B1 discloses an adjustable cutting plate with a cutting edge adjacent to the screw at the beginning of its tapering position for cutting up long items such as wooden poles and the like so that they can be passed through the apparatus.
  • the screw itself may be provided with a cutting edge on its periphery to assist the cutting plate.
  • a screw conveyor comprising a conveyor duct for conveying material; an inlet duct for introducing material into the conveyor duct, the inlet duct comprising an inlet wall, the inlet duct leading to the conveyer duct; a rotatable conveyor screw arranged in the conveyor duct for transporting the material from the inlet duct through the conveyor duct; a wear element forming an edge between the inlet duct and the conveyor duct, the wear element having a wall portion forming part of the inlet duct, the wall portion abutting the inlet wall; the wear element only partially encompassing the conveyor screw so as to be removable to thereby provide a free space between the inlet wall and the conveyer screw.
  • This aspect of the herein disclosed subject-matter is based on the idea that by making the wear element removable so as to provide a free space between the conveyor screw and the inlet wall, the conveyor screw can be made removable with the screw conveyor remaining mounted at the installation site. It should be understood that in order to remove the conveyor screw without removing the screw conveyor from its installation site usually requires further measures, e.g. measures in accordance with further embodiments of the herein disclosed subject-matter.
  • the conveyor duct and the inlet duct may be arranged at an angle with respect to each other.
  • the inlet duct is arranged transverse to the conveyor duct.
  • the edge between the inlet duct and the conveyor duct delimits the inlet duct in a transport direction in which the material is conveyed by the conveyor screw. Hence such an edge between the inlet duct and the conveyor is exposed to wear in particular if larger pieces of material are conveyed.
  • the edge is formed by a wear element in accordance with embodiments of the herein disclosed subject-matter and is configured for taking up the wear in this region, i.e. at an edge between the conveyor duct and the inlet duct. By exchanging the wear element, the edge between the inlet duct and the conveyor duct can be exchanged, thereby maintaining the function of the edge between the inlet duct and the conveyor duct.
  • the wear element is spaced from the conveyor screw by a first distance and the free space has a dimension between the inlet wall and the conveyor screw which is larger than the first distance.
  • the screw conveyor further comprises a flow restriction for the material to be conveyed, the screw conveyor thereby acting as a screw press.
  • the flow restriction can be of any suitable type.
  • the flow restriction is formed by an adjustable flap. By adjusting the cross-section of the flap in the conveyor duct, e.g. by changing its pivoting angle, the degree of flow restriction can be adjusted, thereby adjusting the pressing function of the screw press.
  • the cross-sectional area of the conveyor duct may be reduced in order to act as a flow restriction.
  • the screw conveyor comprises a support counteracting a torsional moment exerted on the conveyor duct due to the rotation of the conveyor screw.
  • the support extends only over part of a circumference of the conveyor duct, for example only over a half of the circumference of the conveyor duct or less than a half of the circumference of the conveyor duct.
  • the support has an opening in axial direction, the opening having a width that is equal or larger than the width of the conveyor screw above the support. In this way, the conveyor screw can be removed through the opening without removing the support.
  • the opening is continuous with the free space provided by the removed wear element.
  • the support forms part of the conveyor duct.
  • the support is of a generally cylindrical shape with a segment of the cylinder being removed.
  • the removed segment or, in other words, the remaining opening of the support has a width that is larger or equal to the width of the conveyor screw mounted in the support.
  • the support is arranged on the same side of the conveyor screw as the inlet duct.
  • the support is formed on a side of the conveyor screw that is opposite the inlet duct.
  • the opening of the support may have another orientation with regard to the inlet duct, for example transverse to the inlet duct.
  • the conveyor duct comprises a removable part.
  • the removable part is located in the opening of the support.
  • the support and the removable part completely enclose the conveyor screw in circumferential direction.
  • "compete enclosure" of the conveyor screw in circumferential direction does not necessarily mean that the enclosure is tight, e.g. fluid tight.
  • the screw conveyor is a screw press
  • one or both of the support and the removable part may be formed as a sieve for allowing liquid pressed out of the conveyed material to be discharged from the screw conveyor through the sieve.
  • the removable part comprises at least one removable sieve.
  • the removable sieve is mounted to have axial clearance.
  • the at least one removable sieve is mounted in an opening of the conveyor duct and are slightly movable in axial direction before they are secured to the conveyor duct. Axial clearance of the at least one removable sieve facilitates removal of the sieve.
  • the removable part of the conveyor duct is secured to the remaining conveyor duct by a securing element.
  • the securing element does not exert axial forces to the removable part.
  • the securing element may extend over the removable part in axial direction, or, in another embodiment, in circumferential direction, thereby securing the removable part to the conveyor duct.
  • the wear element has a surface portion facing the removable part.
  • removal of the wear element and removal of the removable part provides a continuous opening above the conveyor screw, thereby allowing the conveyor screw to be removed from the conveyor duct through the continuous opening.
  • the surface portion of the wear element is directly abutting the removable part.
  • the wear element has, with regard to an axis of rotation of the conveyor screw, a radial dimension that varies in circumferential direction of the wear element.
  • the wear element has its largest dimension above the core of the conveyor screw.
  • the wear element comprises an radially outer edge opposite an radially inner edge facing the conveyor screw.
  • the radially inner edge has a shape mating an envelope shape of a portion of the conveyor screw that is located opposite the radially inner edge.
  • the wear element has a lateral width greater or equal to the lateral width of the conveyor screw.
  • the lateral width of the conveyor screw is constant along its axial direction.
  • the lateral width of the conveyor screw changes in axial direction.
  • the wear element has a width greater or equal than the largest width of the conveyor screw.
  • the wear element has a width greater or equal to the lateral width of a portion of the conveyor screw that is located opposite the wear element.
  • the conveyor duct opposite the wear element is flat in axial direction of the conveyor duct.
  • a sieve may from a continuous inner surface of the conveyor duct portion opposite the wear element.
  • the conveyor duct may have a flat and fluid tight surface portion opposite the wear element.
  • the wear element forms part of the conveyor duct.
  • a method of disassembling a screw conveyor in accordance with one or more embodiments of the first aspect comprising: removing the wear element; and removing the conveyor screw.
  • the screw conveyor comprises the removable part according to an embodiment described with regard to the first aspect
  • the method according to an embodiment further comprises: before removing the conveyor screw, removing the removable part.
  • the method is adapted for providing the functionality of one or more of the aforementioned embodiments and/or for providing the functionality as required by one or more of the aforementioned embodiments, in particular of the embodiments of the first aspect.
  • Fig. 1 shows a screw conveyor 100 in accordance with embodiments of the herein disclosed subject-matter.
  • Fig. 1 does not show a motor for driving the conveyor screw. However, such a motor will of course be present in an real implementation.
  • the screw conveyor 100 comprises a conveyor duct 102 for conveying material (not shown in Fig. 1 ).
  • the screw conveyor 100 further comprises an inlet duct 104 for introducing the material into the conveyor duct 102.
  • the inlet duct 104 leads to the conveyor duct 102.
  • a rotatable conveyor screw 106 is arranged in the conveyor duct 102 for transporting the material from the inlet duct 104 through the conveyor duct 102.
  • the conveyor screw 106 comprises a screw spiral 108 and a screw core 110. It is noted that in Fig. 1 only part of the screw spiral 108 is shown.
  • the conveyor screw 106 defines an envelope of the conveyor screw indicated at 112.
  • the envelope 112 illustrates the extent of the conveyor screw during rotation.
  • the screw conveyor 100 comprises a wear element 114 which forms an edge 111 between the inlet duct 104 and the conveyor duct 102.
  • the inlet duct 104 comprises an inlet wall 105 and the wear element 114 has a wall portion 113 forming part of the inlet duct 104.
  • the wall portion 113 and the inlet wall 105 have aligned surface portions.
  • the aligned surface portions of the wall portion 113 and the inlet wall 105 provide a (substantially) smooth transition between the alinged surface portions, thereby providing a (substantially) smooth inner surface of the inlet duct.
  • the wear element 114 only partially encompasses the conveyor screw 106 so as to be removable in order to provide a free space between the inlet wall 105 and the conveyor screw 106.
  • the conveyor screw 106 can be pivoted upwards, e.g. in a position indicated by the dashed line at 116 in Fig. 1 .
  • the conveyor duct in a portion 117 opposite the wear element 114 the conveyor duct is flat in an axial direction 115 of the conveyor duct 102.
  • the conveyor duct portion 117 opposite the wear element is part of a lower portion 102b of the conveyor duct.
  • the wear element 114 forms a part of the inlet duct 104 and part of the conveyor duct 102, as shown in Fig. 1 .
  • the screw conveyor 100 comprises a flow restriction 109 in the conveyor duct 102.
  • the flow restriction 109 generates a backpressure in the material conveyed in the conveyor duct, thereby generating a pressure in the material, resulting in dewatering of the material.
  • the screw conveyor 100 shown in Fig. 1 is a screw press.
  • the flow restriction is fixedly mounted in the conveyor duct 102.
  • the flow restriction is moveable.
  • the flow restriction is formed by the cross sectional shape of the conveyor duct (not shown in Fig. 1 ).
  • Fig. 2 shows a cross-sectional view of the screw conveyor 100 along line II-II in Fig. 1 .
  • the wear element 114 has an inner edge 118 facing the conveyor screw (not shown in Fig. 2 ) and an outer edge 120 opposite the inner edge 118.
  • the inner edge 118 is concentric and/or the outer edge 120 is eccentric with the envelope 112 of the conveyor screw 106.
  • the wear element 114 is sickle-shaped, as shown in Fig. 2 .
  • the wear element 114 has a width 122 that is greater or equal to the lateral width 124 of the conveyor screw 106.
  • the wear element 114 has, with regard to an axis of rotation of the conveyor screw (the axis of rotation extending perpendicular to the drawing plane of Fig. 2 ), a radial dimension that varies in circumferential direction of the wear element from a maximum radial dimension 126 in a center portion 128 of the wear element 114, whereas the radial dimension of the wear element decreases towards the lateral end portions 130 of the wear element 114.
  • Fig. 3 shows a side view of a further screw conveyor 200 in accordance with embodiments of the herein disclosed subject-matter.
  • the screw conveyor 200 comprises a support 132 counteracting a torsional moment exerted on the conveyor duct 102 due to the rotation of the conveyor screw.
  • the support 132 comprises the bearings for the conveyor screw 106 (not shown in Fig. 3 ).
  • the support 132 counteracts the torsional moment exerted on the conveyor duct by the material to be conveyed in the conveyor duct.
  • the support 132 forms part of the conveyor duct 102.
  • the support 132 forms a lower portion 102b of the conveyor duct 102.
  • the lower portion of the conveyor duct 102 is at least partially formed as a sieve, having a plurality of sieve openings 134, as shown in Fig. 3 .
  • the support 132 forms a segment of a cylinder.
  • the support 132 has an opening 136 extending over a lateral width of the support that is greater or equal to the lateral width of the conveyor screw.
  • the opening 136 extends in downstream direction of the material conveyed (axial direction 115) from the wear element 114 beyond the axial end of the conveyor screw, indicated at 138 in Fig. 3 .
  • the axial end 138 of the conveyor screw is located opposite the inlet end of the conveyor screw which is located at the inlet duct 104.
  • the far end 140 of the opening is located downstream the axial end 138 of the conveyor screw.
  • the conveyor duct 102 comprises a removable part 142.
  • the conveyor duct comprises two or more removable parts 142, whereas in another embodiment, the conveyor duct comprises only a single removable part 142.
  • the removable part 142 is mounted opposite the support 132.
  • the removable part 142 comprises at least one removable sieve.
  • each removable part 142 consists of or comprises a single removable sieve.
  • the removable sieves are mounted to have axial clearance, indicated at 144 in Fig. 3 .
  • the axial clearance 144 facilitates removal of the removable parts 142.
  • an axial clearance does not adversely affect the function of the removable part, since there are already sieve openings 134 provided in the removable part.
  • attachment elements 146 are provided for attaching the removable parts 142 to the support 132.
  • the attachment elements 146 may be configured in any suitable way, e.g. in the form of attachment straps which are provided over the removable parts 142 and which are attached at its ends 148 to the support 132.
  • Fig. 4 shows the screw conveyor of Fig. 3 with the removable parts 142 removed.
  • the wear element 114 is removed. Therefore, the opening 136 in the lower portion 102b of the conveyor duct 102 together with the free space 149 provided by the removal of the wear element allows the conveyor screw 106 to be pivoted upwards as shown in Fig. 4 .
  • the conveyor screw 106 is lifted up at its far end 138 thereby allowing pulling the conveyor screw 106 out of the conveyor duct 102, e.g. in a direction downstream-upwards.
  • the conveyor duct 102 or, in an embodiment, at least the supporting part 102b thereof can remain mounted at the installation side while the conveyor screw 106 is removed for maintenance. It should be noted that maintenance may not only be performed of the conveyor screw 106, but, in an embodiment, also of the wear element 114 (not shown in Fig. 4 ).
  • Fig. 5 shows in part a further screw conveyor 300 in accordance with embodiments of the herein disclosed subject-matter.
  • the inlet wall 105 and the wear element 114 each comprise a hole indicated at 150 in Fig. 5 , allowing screw fastening of the wear element 114 to the inlet wall 105, e.g. by providing a thread in one of the wear element or the inlet wall 105, e.g. in the inlet wall 105.
  • the wear element 114 comprises a recess 152 for receiving part of the inlet wall 105, thereby providing a smooth transition from the inlet wall 105 to the wear element 114, as shown in Fig. 5 .
  • the wear element 114 comprises a surface 154 which continues the duct surface 151 of the inlet wall 105.
  • the wear element 114 comprises a further surface 156 which continues the inner surface 157 (duct surface) of a conveyor wall 159 the conveyor duct 102 which may be formed by the removable part 142.
  • the wear element 114 has a surface portion 158 which faces the removable part 142 of the conveyor duct 102, as shown in Fig. 5 .
  • the edge 111 between the inlet duct 104 and the conveyor duct 102 is formed by a protrusion 155, protruding in an upstream direction 153, opposite the downstream direction 115 of the material moving through the conveyor duct 102.
  • the protrusion 155 may increase the durability of the wear element.
  • the protrusion has the shape of a protruding ring segment pointing in the upstream direction 153.
  • Fig. 6 shows a cross-sectional view of a part of a conveyor screw in accordance with embodiments of the herein disclosed subject-matter.
  • the screw spiral 108 comprises an edge 160, the edge 160 pointing in downstream direction 115 of the material to be conveyed.
  • the edge 160 is configured as sharp edge defining an angle smaller than 110 degrees, e.g. smaller than 100 degrees or smaller than 90 degrees.
  • a sharp edge 160 may increase the efficiency of the screw conveyor.
  • the screw spiral 108 is armoured, having an armouring 162 at a portion pointing in the downstream direction 115.
  • a first armouring layer may be applied to the screw spiral 108, as shown in Fig. 1 .
  • any other suitable type of hardening may be applied to the screw spiral.
  • also part of the core 110 of the conveyor screw is armoured with the armouring 162.
  • an armouring layer 164 is applied on top of the first armouring layer 162, e.g. in the form of a second armouring layer.
  • the second armouring layer 164 is applied only over the edge portion of the armouring 162, thereby forming the sharp edge 160 of the screw spiral 108.
  • the second armouring layer 164 comprises or consists of wolfram carbide (WC).
  • any entity disclosed herein e.g. components, units and devices
  • the herein disclosed subject matter may be implemented in various ways and with various granularity on device level while still providing the desired functionality.
  • a separate entity may be provided for each of the functions disclosed herein.
  • an entity is configured for providing two or more functions as disclosed herein.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screw Conveyors (AREA)
EP12176955.8A 2011-08-26 2012-07-18 Convoyeur à vis Withdrawn EP2561981A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12176955.8A EP2561981A3 (fr) 2011-08-26 2012-07-18 Convoyeur à vis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11179092 2011-08-26
EP12176955.8A EP2561981A3 (fr) 2011-08-26 2012-07-18 Convoyeur à vis

Publications (2)

Publication Number Publication Date
EP2561981A2 true EP2561981A2 (fr) 2013-02-27
EP2561981A3 EP2561981A3 (fr) 2013-12-25

Family

ID=46508286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12176955.8A Withdrawn EP2561981A3 (fr) 2011-08-26 2012-07-18 Convoyeur à vis

Country Status (1)

Country Link
EP (1) EP2561981A3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015121280A1 (fr) * 2014-02-13 2015-08-20 Röhren- Und Pumpenwerk Bauer Ges.M.B.H. Séparateur à vis de pression et bague d'usure
US10703062B2 (en) 2014-06-11 2020-07-07 Hitachi Zosen Inova Ag Screw press for compressing and dewatering a suspension

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790122B1 (fr) 1992-09-26 2002-05-15 Robin Hamilton Presse à vis et procédé de pressage

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US898760A (en) * 1907-04-30 1908-09-15 American Process Company Continuous-screw press.
DE623051C (de) * 1935-03-21 1935-12-12 Miag Muehlenbau & Ind Akt Ges Schneckenpresse fuer feuchtes, z. B. oelhaltiges Pressgut
DE1805868A1 (de) * 1968-10-29 1970-05-27 Krone Kg Strangpresse
DE2351328A1 (de) * 1973-10-12 1975-04-24 Ver Foerderung Inst Kunststoff Verfahren und einrichtung zum verarbeiten von zuvor unzerkleinerten thermoplastischen kunststoffabfaellen (altmaterial) in einschnecken-extrudern
GB1493559A (en) * 1976-04-14 1977-11-30 Dyason R Extruder heads
WO1992013710A1 (fr) * 1991-02-12 1992-08-20 Andritz Sprout-Bauer, Inc. Dispositif a vis et elements de compression reglables
DE69314802T2 (de) * 1992-09-26 1998-05-14 Robin Hamilton Verfahren und vorrichtung zum verdichten
JP5200477B2 (ja) * 2007-10-05 2013-06-05 Ｎｏｋ株式会社 押出機

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790122B1 (fr) 1992-09-26 2002-05-15 Robin Hamilton Presse à vis et procédé de pressage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015121280A1 (fr) * 2014-02-13 2015-08-20 Röhren- Und Pumpenwerk Bauer Ges.M.B.H. Séparateur à vis de pression et bague d'usure
US10703062B2 (en) 2014-06-11 2020-07-07 Hitachi Zosen Inova Ag Screw press for compressing and dewatering a suspension

Also Published As

Publication number Publication date
EP2561981A3 (fr) 2013-12-25

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