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EP3566861B1 - Broyeur à vis sans fin - Google Patents

Broyeur à vis sans fin Download PDF

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Publication number
EP3566861B1
EP3566861B1 EP18171451.0A EP18171451A EP3566861B1 EP 3566861 B1 EP3566861 B1 EP 3566861B1 EP 18171451 A EP18171451 A EP 18171451A EP 3566861 B1 EP3566861 B1 EP 3566861B1
Authority
EP
European Patent Office
Prior art keywords
worm
screw
stage
abrasion
grinding
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.)
Active
Application number
EP18171451.0A
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German (de)
English (en)
Other versions
EP3566861A1 (fr
Inventor
Jürgen HEGER
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.)
Heger & Co KG GmbH
Original Assignee
Heger & Co KG GmbH
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Filing date
Publication date
Application filed by Heger & Co KG GmbH filed Critical Heger & Co KG GmbH
Priority to EP18171451.0A priority Critical patent/EP3566861B1/fr
Publication of EP3566861A1 publication Critical patent/EP3566861A1/fr
Application granted granted Critical
Publication of EP3566861B1 publication Critical patent/EP3566861B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
    • B30B9/3089—Extrusion presses
    • 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
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B30B11/246—Screw constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
    • B30B9/3082—Presses specially adapted for particular purposes for baling; Compression boxes therefor with compression means other than rams performing a rectilinear movement

Definitions

  • the present invention relates to a grinding screw. This is particularly suitable for compacting and grinding highly abrasive fibrous materials.
  • Fibers that are harmful to health such as artificial mineral fibers (AMF), rock wool, glass wool and asbestos, are mostly produced when houses or industrial plants are demolished.
  • AMF artificial mineral fibers
  • rock wool rock wool
  • glass wool glass wool
  • asbestos Fibers that are harmful to health, such as artificial mineral fibers (AMF), rock wool, glass wool and asbestos, are mostly produced when houses or industrial plants are demolished.
  • AMF artificial mineral fibers
  • rock wool rock wool
  • glass wool and asbestos are mostly produced when houses or industrial plants are demolished.
  • Harmful fibrous materials were released during transshipment and valuable landfill space was consumed during landfill.
  • a beating screw can be used to compact and beating such pulps. These are filled into one to two cubic meter plastic or fabric bags under full protection and sealed. This grinding screw is part of a press into which the sacks are thrown through dust protection flaps without first being emptied be able. During the compression and grinding process, the structure of the material to be pressed is broken up by the screw and the material to be pressed is filled into big bags. The pressed material obtained in this way can easily be stored in landfills, does not take up much landfill volume and does not have to be driven over long distances to specialized landfills.
  • Said fibrous materials are highly abrasive materials. This leads to rapid wear of the grinding auger.
  • the grinding process takes place solely as a result of frictional forces on the inner walls of a channel in which the grinding screw is installed. As a result, optimal comminution of the fibers cannot be achieved. Also an optimal crushing of the bags is not possible in this way.
  • JP S54-132985 describes that a snail can be strengthened by adding trapezoidal sheets to the surface of its snail stages. Small gaps are provided between the sheets in order to be able to put the sheets together more easily.
  • the WO 00/30840 A1 provides for the retrofitting of an already worn screw with metal sheets that are trapezoidal along one screw stage and also have a trapezoidal cross-section. Although the sheets touch, their trapezoidal shape results in narrow gaps between the sheets.
  • the DE 10 2006 002 016 A1 describes a worm shaft whose worm helix is provided with peripheral surface irregularities in its peripheral area.
  • the worm spirals themselves do not have to be of irregular design, but can instead be provided with metal sheets which have external teeth.
  • a further object of the present invention is to further develop the grinding screw in such a way that its comminuting and grinding effect is improved.
  • a grinding screw having the features of claim 1, which has a plurality of essentially trapezoidal first abrasion plates. These are arranged on a surface of a screw stage of the grinding screw in such a way that a gap remains free between each two adjacent first abrasion plates.
  • the abrasion plates increase the wear resistance of the grinding screw, as they protect it from direct contact with abrasive fibrous materials. In addition, they also improve the crushing and grinding effect of the grinding screw.
  • the fibers are broken by pressure and lateral forces on the edges of the individual abrasion plates welded on, and this completely changes their structure. The result is a free-flowing product that can be highly compacted. Even plastic bags, which can be made of polyethylene, for example, or fabric bags can be torn into 10 cm to 30 cm shreds using the abrasion plates, which can be easily separated from the rest of the product using a vibrating screen if necessary.
  • the grinding process essentially takes place in one screw stage of the grinding screw and there only in one screw segment. It is therefore preferred that the first abrasion plates are arranged only on one screw flight length in a range from 180° to 360° are. This can be realized in particular by arranging 10 to 20 first abrasion plates in this area. Arranging the first abrasion plates in this area is sufficient to protect the area of the grinding screw most exposed to abrasion from wear. In addition, the arrangement of abrasion plates in this area is already sufficient to achieve a significant improvement in the crushing and grinding effect of the grinding screw. It is therefore not necessary to equip the entire grinding screw with abrasion plates.
  • a minimum width of the gap between each two adjacent first abrasion plates preferably corresponds at least to the thickness of the first abrasion plates. In addition, it is preferably at least 15 mm. This minimal width of the gap also has the advantage that the abrasion plates can be easily attached to the grinding screw by means of welding. Since the width of the gap increases from the edge of the screw stage towards its center due to the trapezoidal shape of the first abrasion plates, the gap has its minimum width at the edge of the screw stage.
  • the abrasion plates preferably have a plug-weld diameter which corresponds at least to their thickness and which is also preferably at least 15 mm.
  • a trapezoid has two bases and two sides.
  • the bases and the legs of the essentially trapezoidal first abrasion plates can be straight lines.
  • a first abrasion plate should also be understood as essentially trapezoidal if one or both base sides are curved.
  • at least one base page of the first abrasion plates is in the shape of a circular arc and particularly preferably both base sides are in the shape of a circular arc.
  • the circular arc shape allows a base facing the outer edge of the screw stage, which also has a circular arc shape, to be flush therewith.
  • the circular arc shape makes it possible for a base side, which faces a screw shaft of the grinding screw, to also run flush with this. Since the legs are straight lines, a constant width of the gap between two adjacent first abrasion plates is achieved.
  • the grinding screw is designed as a stepped screw with a first screw stage and a second screw stage.
  • An outside diameter of the first screw stage is larger than an outside diameter of the second screw stage.
  • the first abrasion plates are arranged on a surface of the second screw stage. Greater abrasion forces occur on this than on the first screw stage, so that by attaching the first abrasion plates both greater protection against wear and a greater improvement in the grinding and comminuting effect can be achieved than if the first abrasion plates were attached to the first screw stage.
  • Such a stepped screw is characterized by the outer diameter of its first screw stage, to which the characteristics of the grinding screw are related in the following. This outside diameter is in particular in the range from 150 mm to 1000 mm.
  • the second screw stage has an outside diameter which is 50% to 70% of the outside diameter of the first screw stage. As a result, particularly high pressure and transverse forces can be achieved on the second screw stage, which are advantageous for the grinding process.
  • the first screw stage has in particular one to three screw segments. These can be attached to the screw shaft by parallel welding.
  • the sheet metal thickness of the screw segments of the first Screw stage corresponds in particular to 2% to 3% of the outer diameter of the first screw stage.
  • the length of the first screw stage is in particular 100% to 150% of the outer diameter of the first screw stage.
  • the second screw stage has, in particular, two to four screw segments. Just like the screw segments of the first screw stage, these can also be attached to the screw shaft by parallel welding.
  • the sheet metal thickness of their base material is in particular 3% to 5% of the outer diameter of the first screw stage.
  • the length of the second screw stage is in particular 100% to 150% of the outer diameter of the first screw stage.
  • a screw pitch of the first screw stage is preferably greater than a screw pitch of the second screw stage.
  • the screw pitch of the first screw stage is preferably 70% to 100% of the outer diameter of the first screw stage over a range of 360°.
  • the screw pitch of the second screw stage is preferably 40% to 60% of the outer diameter of the first screw stage over a range of 360°. It can also be achieved in this way that higher pressure and transverse forces act on the second screw stage than on the first screw stage.
  • the screw segments of a grinding screw are arranged around a circular-cylindrical screw shaft.
  • the outside diameter This screw shank, which corresponds to the inner diameter of the screw stages, is in particular 20% to 30% of the outer diameter of the first screw stage.
  • One end of the screw shaft can be connected to a motor which drives the milling screw.
  • the other end of the screw shank is exposed and is therefore also subject to abrasion. It is therefore preferred that the grinding worm has a circular second abrasion plate on the end face of its worm shaft.
  • first screw stage provided with the first abrasion plates ends and meets the end face of the screw shank
  • this area of the grinding screw can also contribute to the grinding and comminution by breaking fibers at the edges of the gap between the first abrasion plates and the second abrasion plate.
  • Each abrasive plate preferably has a thickness equal to 1% to 6% of the outside diameter of the first stage screw. This makes it possible to simply attach the abrasion plates to the surface of the grinding screw in the manner required for their function.
  • the abrasion plates are preferably made of a composite material that has at least one cover layer and one carrier layer.
  • the carrier layer can be welded and enables the abrasion plates to be attached to the surface of the grinding screw, for example by means of plug welding.
  • the carrier layer preferably consists of a steel.
  • the top layer has a Vickers hardness of at least 700 HV10. This can be determined according to the DIN 32525-4 standard.
  • Preferred materials of the cover layer which have such a hardness, are iron-based alloys containing carbides.
  • these carbides are selected from the group consisting of chromium carbides, niobium carbides, titanium carbides, vanadium carbides, tungsten carbides and mixtures of these carbides.
  • FIG. 1 shows a grinding screw 10 according to a first embodiment of the invention, which is designed as a stepped screw. It has a first screw stage 11 and a second screw stage 12 which are arranged around a screw shank 13 .
  • the outside diameter AD1 of the first screw stage 11 is 770 mm and the outside diameter AD2 of the second screw stage 12 is 460 mm.
  • the inside diameter ID1 of both screw stages 11, 12, which corresponds to the outside diameter of the screw shaft 13, is 203 mm.
  • the first screw stage 11 consists of sheet metal layers with a total thickness DS1 of 20 mm.
  • the length LS1 of the first screw stage 11 is 900 mm and has two parallel welded screw segments. Its screw pitch ST1 is 600 mm over a range of 360°.
  • the second screw stage 12 consists of metal sheets with a total thickness DS2 of 30 mm. It has a length LS2 of 800 mm and has three screw segments welded in parallel. The screw pitch ST2 over a range of 360° is 400 mm. Sixteen first abrasion plates 20 are welded onto the second screw stage 12 by means of plug welding over a length of 400 mm and thus over a screw winding length VBW of 360°. This screw winding length VBW ends at the end of the grinding screw 10.
  • the first abrasion plates 20 are each designed to be essentially trapezoidal. They each have two straight legs and two arcuate bases. The base sides, which each face the outer edge of the second screw stage 12, follow its outer contour. The bases facing the screw shaft 13 are shaped so that the distance between these bases and the screw shaft is the same at all points.
  • a circular second abrasion plate 30 is welded onto the end face of the screw shaft 13 by means of plug welding. The outer diameter of the second abrasion plate 30 corresponds to the outer diameter ID1 of the screw shank 13.
  • a gap 40 remains free in each case between two adjacent first abrasion plates 20 . Extended due to the shape of the first abrasion plates this extends from the edge of the second screw stage 12 to the screw shank 13 . At the edge, its width SA1 is 15 mm and at the bases of the first abrasion plates 20, which end in front of the screw shaft 13, its width SA1 is 20 mm. A gap with a constant width SA2 of 15 mm runs between the base sides that face the screw shaft 13 and the screw shaft 13 or the second abrasion plate 30 .
  • each first abrasion plate 20 and the second abrasion plate 30 are welded to the second screw stage 12 or to the screw shank 13 by means of plug welding.
  • each first abrasion plate 20 has a weld hole 21 and the second abrasion plate 30 has six weld holes 31 . All welding holes 21, 31 each have a diameter SA3 of 20 mm.
  • the mutually adjacent first abrasion plates 20 are each offset from one another.
  • the offset VBV is 3 mm in each case.
  • the offset VBV is defined as the difference between the orthogonal distance of a top edge of a first abrasion plate 20 to the surface of the second screw stage and the corresponding orthogonal distance between the top edge of the adjacent abrasion plate 20 and the surface of screw stage 12, with the two edges being defined by the Gap 40 are separated from each other.
  • the first abrasion plates 20 and the second abrasion plate 30 each have a thickness VBD of 20 mm. They each consist of a top layer and a carrier layer.
  • the carrier layer is a layer of S235 steel, which can be welded to the surface of the second screw stage 12 in a plug welding process.
  • the cover layer consists of VAUTID® 100 (VAUTID Group Ostfildern, Germany). This is an iron-based alloy that contains chromium carbides and has a Vickers hardness of 740 HV10.
  • the cover layer consists of VAUTID® 143 (VAUTID Group).
  • the cover layer consists of VAUTID® 200 (VAUTID Group). This is an iron-based alloy containing vanadium carbides, titanium carbides and niobium carbides. It has a Vickers hardness of 850 HV10.
  • a grinding screw according to one of these exemplary embodiments is used for grinding artificial mineral fibers, wear mainly occurs on the first abrasion plates 20 and the second abrasion plate 30 .
  • the grinding screw 10 can be worked up by removing the second screw stage 12 or even just that area of the second screw stage 12 which has the first abrasion plates 20 and the second abrasion plate 30 over a screw winding length VBW , is separated from the remaining grinding screw 10 and replaced by a replacement piece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Crushing And Grinding (AREA)

Claims (11)

  1. Broyeur à vis sans fin (10) présentant un premier étage de vis sans fin (11) et un deuxième étage de vis sans fin (12), le diamètre extérieur (AD2) dudit deuxième étage de vis sans fin (12) faisant 50 à 70 % du diamètre extérieur (AD1) du premier étage de vis sans fin (AD1), caractérisé en ce que plusieurs premières tôles abrasives (20) sensiblement trapézoïdales sont agencées sur une surface du deuxième étage de vis sans fin (12) du broyeur à vis sans fin (10) de façon à ménager un espace (40) entre deux premières tôles abrasives (20) et de façon à produire un décalage (VBV) respectif entre deux premières tôles abrasives (20) voisines qui soit situé dans une plage de 0,1 à 0,7 % du diamètre extérieur (AD1) du premier étage de vis sans fin (11).
  2. Broyeur à vis sans fin (10) selon la revendication 1, caractérisé en ce que les premières tôles abrasives sont agencées sur une longueur d'hélice (VBW) dans une plage de 180° à 360°.
  3. Broyeur à vis sans fin (10) selon la revendication 2, caractérisé en ce que 10 à 20 premières tôles abrasives (20) sont agencées dans ladite plage.
  4. Broyeur à vis sans fin (10) selon l'une des revendications 1 à 3, caractérisé en ce que la largeur (SA1) de l'espace (20) correspond au moins à l'épaisseur (VBD) des premières tôles abrasives (20).
  5. Broyeur à vis sans fin (10) selon l'une des revendications 1 à 4, caractérisé en ce qu'au moins un côté de base des premières tôles abrasives est en arc de cercle.
  6. Broyeur à vis sans fin (10) selon l'une des revendications 1 à 4, caractérisé en ce qu'un pas de vis (ST1) du premier étage de vis sans fin (11) est supérieur à un pas de vis (ST2) du deuxième étage de vis sans fin (12).
  7. Broyeur à vis sans fin selon la revendication 6, caractérisé en ce que le pas de vis (ST2) du deuxième étage de vis sans fin (12) sur une plage de 360° fait 40 à 60 % du diamètre extérieur (AD1) du premier étage de vis sans fin (11).
  8. Broyeur à vis sans fin (10) selon l'une des revendications 1 à 7, caractérisé en ce qu'il présente une hampe de vis sans fin (13) sur la face avant de laquelle est agencée une deuxième tôle abrasive (30) circulaire.
  9. Broyeur à vis sans fin (10) selon l'une des revendications 1 à 8, caractérisé en ce que chacune des tôles abrasives (20, 30) présente une épaisseur (VBD) correspondant aux 1 à 6 % du diamètre extérieur (AD1) du premier étage de vis sans fin (11).
  10. Broyeur à vis sans fin (10) selon l'une des revendications 1 à 9, caractérisé en ce que les tôles abrasives (20, 30) se composent d'un matériau composite présentant au moins une couche supérieure dont la dureté Vickers est d'au moins 700 HV10 et une couche support apte au soudage.
  11. Broyeur à vis sans fin (10) selon la revendication 10, caractérisé en ce que la couche supérieure présente un alliage à base de fer contenant des carbures choisis dans le groupe constitué par les carbures de chrome, les carbures de niobium, les carbures de titane, les carbures de vanadium, les carbures de tungstène et des mélanges de ces carbures.
EP18171451.0A 2018-05-09 2018-05-09 Broyeur à vis sans fin Active EP3566861B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18171451.0A EP3566861B1 (fr) 2018-05-09 2018-05-09 Broyeur à vis sans fin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18171451.0A EP3566861B1 (fr) 2018-05-09 2018-05-09 Broyeur à vis sans fin

Publications (2)

Publication Number Publication Date
EP3566861A1 EP3566861A1 (fr) 2019-11-13
EP3566861B1 true EP3566861B1 (fr) 2022-04-06

Family

ID=62148159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18171451.0A Active EP3566861B1 (fr) 2018-05-09 2018-05-09 Broyeur à vis sans fin

Country Status (1)

Country Link
EP (1) EP3566861B1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6058126B2 (ja) * 1978-04-06 1985-12-18 石川島播磨重工業株式会社 コンベア用スクリユの製作方法
US4466533A (en) * 1982-09-30 1984-08-21 Shwayder Warren M Blade edge wear clips
AT396915B (de) * 1991-07-19 1993-12-27 Pickart Josef Fahrzeug zum transport von müll od. dgl.
NO985381L (no) * 1998-11-19 2000-05-22 Pulping As Kvaerner FremgangsmÕte for oppretting av slitte skruevinger i en skruepresse
DE102006002016A1 (de) * 2006-01-13 2007-07-19 Andreas Kufferath Gmbh & Co. Kg Schneckenwelle für eine Schneckenpresse
WO2015074146A1 (fr) * 2013-11-19 2015-05-28 9103-8034 Québec Inc. Système de convoyeur à vis sans fin pour appareil de compactage

Also Published As

Publication number Publication date
EP3566861A1 (fr) 2019-11-13

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