EP1043088B1 - A process and machine for continuous formation of conveyor screws for archimedes-type screws - Google Patents

A process and machine for continuous formation of conveyor screws for archimedes-type screws Download PDF

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Publication number
EP1043088B1
EP1043088B1 EP00830086A EP00830086A EP1043088B1 EP 1043088 B1 EP1043088 B1 EP 1043088B1 EP 00830086 A EP00830086 A EP 00830086A EP 00830086 A EP00830086 A EP 00830086A EP 1043088 B1 EP1043088 B1 EP 1043088B1
Authority
EP
European Patent Office
Prior art keywords
spiral
shaft
movement device
support
shafts
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 - Lifetime
Application number
EP00830086A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1043088A1 (en
Inventor
Vainer Marchesini
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.)
WAM SpA
Original Assignee
WAM SpA
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Filing date
Publication date
Application filed by WAM SpA filed Critical WAM SpA
Publication of EP1043088A1 publication Critical patent/EP1043088A1/en
Application granted granted Critical
Publication of EP1043088B1 publication Critical patent/EP1043088B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/26—Making finned or ribbed tubes by fixing strip or like material to tubes helically-ribbed tubes

Definitions

  • the invention relates to a process and a machine for continuous formation of conveyor screws for archimedes type screws.
  • conveyor screws which each comprise an internal support shaft, about which a band is coaxially and spirally wound.
  • FR-A-814 323 discloses a process for formation of conveyor screws for Archimedes screw systems, as in the preamble of claim 1, wherein each conveyor screw comprises an internal support shaft at a periphery of which a spiral is wound; the process, which comprises the step of infeeding a band continuously into a spiral forming zone in which the band is made to wind into a spiral shape, has the disadvantage of stopping production to use a new shaft.
  • a machine according to the preamble of claim 6 is known from FR-A-814 323 as well.
  • the main aim of the present invention is to provide a process for obviating the above-mentioned limitations and drawbacks in the prior art.
  • An advantage of the invention is that it makes available a process which is relatively rapid and thus leads to increases in productivity.
  • variable-step conveyor screws can be produced with good geometrical precision and relatively simply.
  • a further aim is to provide a constructionally simple and economical machine for realising the above-described process.
  • An advantage of the machine is that it is relatively small.
  • each screw comprises an internal support shaft to which a spiral-fashioned metal band is externally fixed.
  • the machine 1 comprises means for continuously feeding a uniform-width band 2 into a device 3 for spiral-forming.
  • the means for continuously feeding comprise a spool 5, from which the band 2 is continuously dispensed, and a guide 6, for example a roller-guide, for orienting and conveying the band 2 in an advancement direction.
  • the guide 6, of known type is provided with means for regulating the orientation of the band 2; the means for regulating continuously control and can vary the advancement direction of the band 2.
  • the spiral-forming device 3 also of known type, receives the continuously-advancing belt 2 and by cold-forming causes it to wind into a spiral, developing along a horizontal axis x-x.
  • the cold-forming is done by two rollers 3a and 3b, having their active surfaces inclined with respect to the band fed in between them.
  • the internal edge of the spiral 4 of band is shaped and arranged as a cylindrical spiral of a predetermined diameter.
  • the machine 1 comprises a first shaft movement device 7 for moving the support shafts A and B located upstream of the spiral-forming device 3.
  • the first shaft movement device 7 comprises a truck 7a which can be commanded to move in both senses in direction F parallel to the horizontal axis x-x of the spiral 4.
  • the truck 7a bears a chuck 7b for gripping and rotating a shaft A about an axis thereof and coaxially to the spiral.
  • the chuck 7b is in effect a device for controlling rotation of a shaft, mounted on a mobile horizontal support, constituted by the truck 7a.
  • the machine comprises a further support 7c predisposed at a certain distance from the truck 7a and supporting the rotating shaft A.
  • the support 7c is horizontally mobile on command in both senses of direction F, preferably in synchrony with the truck 7a.
  • the truck 7a is predisposed to introduce the support shaft into the centre of the spiral 4 of the band, in an advancement direction G, coaxially to the spiral.
  • the external diameter of the shaft is about the same as the diameter of the internal edge of the spiral 4 destined to be fixed to the shaft.
  • the spiral is not only wound, but is also narrowed about the internal shaft: in other words, during the coupling of the spiral 4 with the shaft, the spiral 4 is not only wound about the shaft but is also deformed, in effect stretched, by effect of the contact with the shaft A.
  • the machine is equipped with means 8 for fixing the spiral 4 to an internal support shaft A introduced through the centre of the spiral 4.
  • the means for fixing are in the example constituted by an automatic welder 8a arranged on a group 8b which is mobile on command in a parallel direction to the axis x-x of the spiral in both senses.
  • the welder 8a welds (e.g. spot-welds) the internal edge of the spiral 4 onto the circumference of the support shaft.
  • a cutting device 9 is predisposed between the welder 8a and the rollers 3a, 3b, which cut the spiral 4 into lengths. Before cutting, each length will have been previously fixed to a support shaft, as will be better explained herein below.
  • the cutting device 9, like the welder 8a, is mobile on command in the direction of the axis x-x of the spiral formation.
  • the machine Downstream of the spiral-forming device 3 (downstream being in reference to the direction G of advancement of the support shafts), the machine comprises a second movement device 10, similar to the first and opposite thereto.
  • the second device 10 comprises a second truck 10a situated, with respect to the spiral-forming zone, on the opposite side of the first truck 7a.
  • the second truck also bears means for gripping and rotating the support shaft, which means comprise a chuck 10b, opposite to the chuck 7b, for gripping and rotating a shaft arranged coaxially to the spiral.
  • the two movement devices 7 and 10 operate in synchrony; in particular, the second movement device 10 receives a support shaft from the first movement device 7 and distances the shaft axially from the spiral-forming zone (i.e. the rollers 3a and 3b) after the spiral has been cut to a desired length.
  • the two trucks 7a and 10a translate at speeds above the normal axially-directed advancement speed of the spiral being formed.
  • Each support shaft A, B comprises at opposite ends thereof two internally-grooved collars A' and B'.
  • Each end collar can be connected with a grooved coupling to an end collar of another shaft by means of a joint constituted by a short shaft 11, externally grooved so as to be couplable to either end collar.
  • These grooved couplings enable the two shafts A and B to be joined coaxially to each other, so as to render the two shafts solid in rotation but disengageable from each other by simple reciprocal pulling in an axial direction.
  • Other types of couplings could be used to join the two shafts A and B.
  • the band 2 is fed continuously into the spiral-forming device 3, and the spiral 4 is therefore also continuously-formed at a controlled speed.
  • the internal shaft is commanded, by the movement devices 7 and 10, to translate in direction G and to rotate about its own axis, at controlled translation and rotation speeds and in relation to the spiral-forming speed.
  • the rotating-translating movement of the internal shaft and the formation of the external spiral are contemporaneous, so that the spiral will form about the moving shaft.
  • the truck 7a and the chuck 7b cause the shaft to rotate and translate in synchrony with the movement of the spiral formation operation.
  • the spiral formation operation is so regulated that the spiral exerts a certain squeezing pressure on the shaft.
  • the spiral though not welded on the shaft, is however tightly held thereon.
  • the spiral formation starting from the flat straight band, is essentially realised by the action of the means for plastically deforming, i.e. the rollers 3a and 3b, in collaboration with the shaft.
  • the presence of the shaft at the centre of the spiral while the latter is being formed contributes to the formation of a regular spiral and facilitates the subsequent welding operation.
  • the welder 8a fixes the spiral to the shaft by a plurality of spots, or with a continuous seam if so desired.
  • a second shaft is coupled coaxially behind the shaft, on which in the meantime the spiral continues to be formed.
  • the second shaft is coupled to the back end of the first shaft, upstream of the spiral formation zone, while a tract of the first shaft is still passing through the zone.
  • the second shaft is destined to pass through the above-mentioned zone immediately after the first shaft, practically continuously and without interrupting the movement of the shafts and the formation of the spiral. It is possible, if so preferred, to stop the movement during the passage from the first to the second shaft.
  • the second shaft is coupled in the following way.
  • the chuck 7b of the first truck 7a (upstream of the spiral forming zone) is disengaged from the first shaft.
  • the left end of the first shaft is therefore free as it is no longer engaged in the first chuck 7b.
  • the first shaft is however supported during this phase by the second movement means 10 and possibly by other supports (in this case the mobile support 7c).
  • the truck 7a is subsequently commanded to retreat quickly, distancing from the rollers 3a, 3b in order to reach a retracted position in which a second shaft can be fixed to the chuck 7b.
  • the truck 7a Before leaving the spiral forming zone, the truck 7a is quickly advanced in order that the free right end of the second shaft in can be inserted in the free left end of the first shaft, after insertion of a joint constituted by the short grooved shaft 11 into the end collars A' and B'.
  • a continuity is created between the two shafts, so that when the first shaft leaves the spiral forming zone, a second shaft, commanded to rotate and translate, immediately enters the empty central zone of the spiral.
  • the result is that there is at all times a longitudinal element in the spiral formation zone, and precisely in the internal space created by the spiral, which advances and rotates continuously and in synchrony with the formation of the spiral, guaranteeing process continuity.
  • the cutting device 9 is commanded to cut the spiral transversally.
  • the spiral is cut at a tract of the second shaft which is close to the joining zone between the two shafts.
  • the cut is made without involving the abovementioned tract of the second shaft, as it interests only the spiral 4, which it cuts to length with respect to the first shaft.
  • the second truck 10a bearing the chuck 10b gripping the first shaft, is moved swiftly rightwards, distancing the first shaft from the second shaft and also removing it from the spiral forming zone.
  • the first shaft about which a length of spiral is wound and fixed, is thus drawn by the truck 10a and the chuck 10b into a position which facilitates the detachment of the shaft from the chuck 10b and the subsequent distancing of the machine.
  • the separation and axial distancing of the first shaft from the second can be obtained thanks to the fact that the length of spiral which is solid to the first shaft has been detached, by means of the previous cut, from the remaining tract of spiral, which continues to develop about the second shaft. Firstly the above-mentioned separation between the two shafts is made possible by the fact that the grooved coupling between the shafts permits axial uncoupling.
  • the formation of the spiral can proceed with no interruption and at a more-or-less constant speed, though it can also be performed intermittently.
  • the truck 10a is translated leftwards, opposite to direction G, nearing the spiral formation zone, in order that the chuck 10b can engage the right end of the second shaft, i.e. the shaft passing through the spiral forming zone and undergoing the spiral-forming operation.
  • the other chuck 7b situated upstream, is commanded to disengage from the left end of the shaft; the truck 7a is retreated to allow the chuck 7b to grip a third shaft; the other, free end of the third shaft is connected up, by means of the grooved coupling, to the free left end of the second shaft, which in the meantime continues to advance into the spiral forming zone.
  • the connection between the two shafts is obtained as previously described.
  • insertion of the shafts into the spiral forming zone, coaxially one after another, is preferably done with no interruptions and harmoniously with the creation of the spirals. This prevents any subsequent laborious spiral winding operations on the shaft.
  • the spiral forming device is fixed and the support shafts are mobile with respect thereto. It would be possible, however, to set up other systems, for example systems having a mobile spiral forming device, which would obtain a relative axial movement between the shafts and the spiral under formation.
  • the welding and cutting of the spiral can be automatically done, as in the illustrated example, or can be done manually or semi-automatically.
  • the spiral forming device 3 can be advantageously provided with a plastic deformation parameter regulation system, and in particular could be equipped with one or more of the following devices: a forming roller pressure regulator, also for regulating the inclination of the rollers themselves; a flat band infeed angle variator situated internally of the rollers; and an infeed speed regulation device of the belt into the spiral forming device.
  • a forming roller pressure regulator also for regulating the inclination of the rollers themselves
  • a flat band infeed angle variator situated internally of the rollers
  • an infeed speed regulation device of the belt into the spiral forming device Preferably also included is an advancement speed regulation device in the direction of arrow G, to regulate the speed of the shafts as they are moved into the spiral forming zone.
  • a shaft rotation speed regulator is also advisable.
  • spirals having variable steps can be extremely precisely manufactured. Furthermore, the regulation of the working parameters guarantees (even before beginning the welding operation of the spiral to the shaft) a perfect coupling of the internal edge of the spiral with the peripheral surface of the shaft. The spiral can in fact be squeezed on to the shaft so tightly that the two elements can be considered solidly reciprocally constrained even before welding.
  • the first shaft inserted into the spiral forming zone could be a decoy, only used to facilitate the setting up of the spiral forming operation and subsequent infeeding of the actual workpiece shafts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screw Conveyors (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP00830086A 1999-04-06 2000-02-08 A process and machine for continuous formation of conveyor screws for archimedes-type screws Expired - Lifetime EP1043088B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO990065 1999-04-06
IT1999MO000065A IT1310206B1 (it) 1999-04-06 1999-04-06 Metodo e macchina per la formazione in continuo di eliche di trasporto per trasportatore a coclea.

Publications (2)

Publication Number Publication Date
EP1043088A1 EP1043088A1 (en) 2000-10-11
EP1043088B1 true EP1043088B1 (en) 2002-12-04

Family

ID=11386934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00830086A Expired - Lifetime EP1043088B1 (en) 1999-04-06 2000-02-08 A process and machine for continuous formation of conveyor screws for archimedes-type screws

Country Status (4)

Country Link
EP (1) EP1043088B1 (it)
AT (1) ATE228900T1 (it)
DE (1) DE60000888T2 (it)
IT (1) IT1310206B1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102059462B (zh) * 2010-11-03 2012-08-22 太仓市宝马油脂设备有限公司 一种螺旋叶片的制作方法
CN103071699B (zh) * 2012-12-27 2015-06-17 伦慧东 螺旋筋增强薄壁金属管的加工系统
CN105689431A (zh) * 2016-02-01 2016-06-22 唐山市丰润区天鑫金属制品有限公司 多功能翅片缠绕机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR814323A (fr) * 1935-11-07 1937-06-21 Procédé et dispositif pour fabrication de transporteurs à vis
FR2146134B1 (it) * 1971-07-20 1974-04-26 Leblond Leon

Also Published As

Publication number Publication date
ATE228900T1 (de) 2002-12-15
IT1310206B1 (it) 2002-02-11
EP1043088A1 (en) 2000-10-11
DE60000888T2 (de) 2003-09-11
DE60000888D1 (de) 2003-01-16
ITMO990065A0 (it) 1999-04-06
ITMO990065A1 (it) 2000-10-06

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