EP2331275A1 - Welding method in machines for manufacturing metal cages for reinforced concrete and corresponding machine - Google Patents
Welding method in machines for manufacturing metal cages for reinforced concrete and corresponding machineInfo
- Publication number
- EP2331275A1 EP2331275A1 EP08875861A EP08875861A EP2331275A1 EP 2331275 A1 EP2331275 A1 EP 2331275A1 EP 08875861 A EP08875861 A EP 08875861A EP 08875861 A EP08875861 A EP 08875861A EP 2331275 A1 EP2331275 A1 EP 2331275A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal wire
- welding
- cage
- longitudinal
- rotation
- 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.)
- Granted
Links
- 238000003466 welding Methods 0.000 title claims abstract description 112
- 239000002184 metal Substances 0.000 title claims abstract description 89
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 89
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 28
- 239000006096 absorbing agent Substances 0.000 claims description 8
- 230000035939 shock Effects 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 13
- 238000009826 distribution Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
- B21F27/121—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars
- B21F27/122—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars by attaching a continuous stirrup to longitudinal wires
- B21F27/124—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars by attaching a continuous stirrup to longitudinal wires applied by rotation
Definitions
- the present invention relates to a welding device destined to be used in machines for manufacturing metal cages for reinforced concrete and similar.
- metal cages are used, with different shapes, for instance cylindrical or prismatic, consisting of a series of longitudinal iron bars outside which a rod is placed spiral wound onto the same bars, according to an adequately prearranged pitch; alternatively, a series of stirrups can be arranged adequately spaced one another.
- the longitudinal bars are distributed according to an adequate geometrical profile, polygonal or cylindrical; nonetheless examples of piles and pillars with different geometry are known, for instance elliptical, polygonal and similar.
- Some machines of the known type are also equipped with an automatic welding device suited to carry out the welding, generally with deposit metal, of the longitudinal bars to the metal wire externally wound in the shape of a spiral.
- the welding device usually comprises welding members, guiding means of the metal wire in winding around the metal bars and sensors suited to detect the presence of a bar by the welding area and to operate the activation of the welding members.
- the welding device can be prearranged by the fixed or mobile head through which the bars are sliding, according to the type of machine on which it is applied.
- the welding devices of known type such as for instance the one devised in patent IT 1.216.960 in the name of the same Applicant, do not solve the problem of satisfyingly and reliably carrying out the welding of metal cages for reinforced concrete with polygonal profile, by they are just limited to substantially circular shapes.
- the guiding rollers of the welder once adjusted on a certain diameter, do not undergo any substantial radial position variation during the rotation of the moulding to form the structure, and more precisely during the spiral winding phase.
- the guiding rollers are mounted on only one support, and they follow the movement of the welder.
- the aim of the present invention is to overcome the cited drawbacks by devising a welding method and device for machines suited to realize metal cages for reinforced concrete and similar, which allow to realize metal cages of any section, in particular with polygonal profile, also with section variable in the product length.
- Another aim of the present invention is to devise a welding device, which allows to realize metal cages for concrete reinforcements with a higher grade of automation and productivity.
- a further aim of the present invention is to devise a welding device destined to be used in apparatuses to realise metal cages for reinforced concrete of simple conception, certainly reliable functioning, versatile use, and also relatively inexpensive.
- FIG. 1 illustrates an overall perspective view of the welding device applied to a machine for manufacturing metal cages for reinforced concrete according to the present invention
- FIG. 2, 3 and 4 respectively illustrate a front view, a side view and a plan view of the same device in one same operational phase
- FIG. from 5 to 8, from 9 to 12, from 13 to 16 respectively illustrate the same views of the welding device illustrated in the figures from 1 to 4 in different operational phases;
- Fig. 17 and 18 respectively illustrate a front view and a side view of a different embodiment of the claimed welding device.
- Fig. 19, 20 and 21, 22 illustrate a front view and a side view respectively, of different applications of the mentioned different embodiment of the welding device.
- 1 refers to the welding device suited to be used in a machine for manufacturing metal cages 2 for the bearing piles reinforcement, reinforced concrete pillars and similar.
- the above-mentioned machine is not shown for the sake of simplicity.
- the metal cage 2 to be manufactured consists of a series of longitudinal bars 3 arranged parallel and made integral, according to a provided geometry, through one metal wire 4, spiral- wound on the same bars 3 according to a suitably set pitch, or alternatively through a series of stirrups, as shown in the drawing.
- the metal wire or the stirrups 4 are welded externally to the bars 3 by means of the welding device 1.
- the bars 3 destined to form the metal cage 2 are arranged according to a polygonal transverse profile, and in particular a square profile, in order to determine the realization of a prismatic pile. It is clearly possible to provide for realizing cages with a different transversal profile, for instance prismatic, rectangular, circular or elliptical with symmetric or asymmetric distribution of the bars.
- the metallic wire 4 is fed by a bobbin borne unwinding by a reel, not illustrated for the sake of simplicity, arranged sideways to the welding device 1.
- the longitudinal bars 3 are borne by two or more motorized heads, not illustrated either, in the exact fixing position to form the cage 2.
- the above-mentioned heads carry respective rotating members, for example disks or similar, arranged facing one another and coaxial according to a longitudinal axis, preferably horizontal. The disks are suited to bear in rotation the longitudinal bars 3 during the formation of the cage 2.
- the feeding of the metal wire 4 takes place in such a way that the above mentioned rotation of the longitudinal bars 3 is combined to a translational movement of the head on which the distribution unit of the spiral of the cage in formation is mounted, along the longitudinal axis of the cage in formation.
- the rotation combined with the shift movement of the distribution unit of the spiral determines the control of the spiral- winding of the metal wire 4 around the bars 3 according to the cited prearranged pitch, in case even changeable.
- the welding device 1 comprises a support frame 5 suited to be associated with one of the above-mentioned support and handling heads of the longitudinal bars 3.
- the support frame 5, as already stated, can be longitudinally fix or mobile depending on the type of machine.
- the support frame 5 is preferably arranged above the longitudinal bars 3 borne in rotation by the motorized heads.
- the support frame 5 carried a mobile welding member 6 suitable to perform the welding operation, in particular with deposit metal, between each longitudinal bar 3 and the metal wire 4 in winding around the cage in formation.
- the welding member 6 is constrained to a first sliding slide 7 for instance vertically on a first guide 8 front borne by the support frame 5.
- the first slide 7 is suited to be operated alternately with the aid of first actuator means 9, for example of pneumatic type, between an inactive position 7a (figure 3), detached from the cage 2 in formation, and an active welding position 7b approached to the spiral wire (figure 7), approached to cage 2 by the junction to be realized between a longitudinal bar 3 and the metal wire 4.
- the apparatus provides, in a known way, for sensor means suited to detect the arrival of the longitudinal bar 3 in the provided welding position, in alignment with the welding member 6, and consequently to control the lowering of the welding member 6 to start a welding cycle.
- the first slide 7 further bears a fork-shaped centring member 10 adjacent to the welding member 6, suitable to engage the longitudinal bar 3 at the back of the metal wire 4, when the first slide is at the active position 7b.
- the fork 10 has a double function, centring for welding operations and hooking to the longitudinal bar 3.
- the hooked longitudinal bar 3 causes the welding member 6 to follow its movement deriving from the rotation around the longitudinal axis of cage 2 in formation, to allow the carrying out of the welding operations even when moving, as better hereby described.
- the first slide 7 is mounted on a support frame 5 by interposition of a second slide
- the second slide 11 suitable to slide on a second guide 12 constrained to the support frame 5 and perpendicular to the first guide 8.
- the second slide 11 is movable on the second guide 12, both in consequence of said dragging action carried out by the fork 10 during the welding performed by the welding member 6, and upon operation of the actuator means 13, for instance of pneumatic type, during the return stroke of the welding member 6, in consequence of which the welding member 6 places itself to begin a new welding cycle.
- the two orthogonal guides 8, 12 allow the welding member 6 to follow the welding point along the arch of a circle during the rotation made by the joint in the circular movement of formation of the cage 2.
- the welding member 6 makes a welding active stroke during which the welding member 6 works in the active position 7a of the first slide 7 on the joint to be realized, following the longitudinal bar 3 in its rotation around the axis of the cage 2 in formation, from an initial position to a final welding position, and an inactive stroke in which the welding member 6 goes back to the initial position and is lifted to inactive position upon control of the actuator means 9 working on the first slide 7.
- the support frame 5 is constrained to the respective fixed framework, not shown for the sake of simplicity, by the interposition of an articulation 14 suitable to allow the rotation of same frame 5 around an axis substantially perpendicular to the longitudinal axis of the cage 2 in formation, to arrange the welding device coplanar to the plane of unwinding of the loop, which obviously varies inclination according to the pitch of the spiral to realize, determined by the combination of the longitudinal translation speed and the rotation peripheral speed.
- the welding unit is spontaneously oriented by means of articulation 14, without the aid of actuator means and similar.
- other positions and orientations can be indicated, of said rotation axis of articulation 14, in order to obtain what stated.
- the support frame 5 further bears guiding means 15 suitable to be associated with the metal wire 4 in unwinding.
- the guiding means 15 preferably comprises a pair of rolling guiding members 16 borne by support means 17 consisting for instance of respective arms to engage and keep always in contact the metal wire 4 in unwinding.
- the rolling guiding members 16 preferably consist of grooved rollers.
- the arms 17 are constrained to elastic means 18 suitable to contrast the detachment of the guiding members 16 from the metal wire 4. During the rotational movement the guiding members 16 must follow the variations of radial position caused by the fact that the rotation element has polygonal section and not circular. More precisely, the arms 17 are articulated to the support frame 5 by opposite parts as to the welding member 6, in order to rotate on a substantially vertical plane.
- the grooved rollers 16 are pivoted to the end of the arms 17, according to respective axis parallel to the joint axis of the same arms. Each grooved roller 16 is suitable to engage the metal wire 4 in unwinding, in correspondence with respective portions, from any side as to the welding member 6.
- the elastic means 18 preferably consists of shock absorber means of the piston type, hydraulic or pneumatic, articulated to each arm 17.
- every shock absorber member 18 is pivoted to a central portion of the arm 17 and to the support frame 5 (see in particular figures 1 to 4).
- the shock absorber members 18 are adjusted so that, thanks to the jointing to the arms 17, the grooved rollers 16 remain constantly in contact with the metal wire 4 in any winding phase around cage 2 in formation.
- the grooved rollers 16 can follow the radial shifts of the metal wire, also in areas in correspondence with the vertex which have asperities difficult to cover.
- the longitudinal bars 3 cross the head of the caging apparatus, in which the welding device 1 is used.
- the longitudinal bars 3 are arranged around the longitudinal axis of the cage 2 in formation, according to the transversal profile to obtain and borne in rotation at least by a motorized head suitable for this purpose.
- the metal wire 4 is fed in unwinding from the respective bobbin placed sideways to the longitudinal bars 3. From the combination of the rotating movement of longitudinal bars 3 and the translation motion of the metal wire 4 in relation to the same bars 3, the metal wire 4 is spiral- wound externally to the bars 3.
- the metal wire 4 is suitable to be fixed through welding to bars 3 met along the described winding path.
- the welding member 6 is arranged in inactive position, detached from the cage 2 in formation (see figures 1 to 4).
- the welding member 6 is operated so to perform the junction, in particular through deposit metal, between the hooked bar 3 and the metal wire 4.
- the welding member 6 follows the bar 3 to which it is hooked through the fork 10 for the whole length of the effective stroke, necessary to guarantee the realization of an effective junction between the bar 3 and the wire 4.
- the welding is carried out at substantially null relative velocity between the welding member and the joint to be welded.
- the welding member 6 is dragged by the bar 3, which rotates around the longitudinal axis of the cage 2 in formation, adequately sliding on the first slide 8 and the second slide 12.
- the welding member 6 is borne free to autonomously move to follow the joint of the longitudinal bar 3 and of the metal wire 4 in welding phase, during the above-mentioned combined movement of rotation and translation.
- the welding member 6 is operated by actuator means 9 to return to the inactive position at some distance from cage 2 in formation (see figures 13 to 16).
- the actuator means 13 is operated to control the return stroke of the welding member 6 in order to prepare it to a new welding cycle between a subsequent longitudinal bar 3 and the metal wire 4. Also in this phase the grooved rollers 16 continue to be kept constantly in contact with the metal wire 4.
- the described welding device reaches therefore the aim to realize metal cages for reinforced concrete of any shape, in particular with polygonal profile.
- This is made possible, in particular, thanks to the presence of at least one grooved roller 16, mounted on a relative support 17 suitable to undergo the contrast action of the corresponding shock absorber 18, to prevent from the detachment of the same roller 16 from the metal wire 4.
- the grooved rollers 16 can effectively follow the metal wire 4 also in correspondence to the vertex of the transversal profile of the cage 2 in formation.
- Those vertex are the crucial positions of the winding path of the metal wire 4 around the longitudinal bars 3, since in correspondence with them the radial distance of the metal wire 4 from the longitudinal axis of the cage 2 varies with sudden discontinuity, thus inverting the motion.
- the shock absorbers 18 can promptly react to this variation, suitably modulating the operating force on the grooved rollers 16 in order to adapt the positioning of the grooved rollers 16 to the transversal profile of the cage, avoiding any risk of loss of contact of the grooved rollers 16 with the wire 4.
- the guide of the metal wire 4 is therefore assured along the entire winding path of the metal wire 4 around longitudinal bars 3.
- FIGS 17 and 18 a different embodiment of the welding device is shown, in which the grooved rollers 16 are borne, freely swivelling, to the opposite ends of a crossbar 19 lying on a vertical plane substantially transversal to bars 3.
- the crossbar 19 is pivoted, through a median pin 20, to a slide 21 that slides along a vertical guide 22 defined at the back to the support frame 5.
- the slide 21 is stressed by an actuator member 23 carried, in adequately adjustable position, by a bracket support 24 constrained to the support frame 5, in order to push and keep the grooved rollers 16 elastically in contact with the metal wire 4.
- the rolling guiding members 16 can be supported by different means from those illustrated.
- the use of a sole guiding wheel can be provided, borne by slide means sliding in a direction substantially radial to the circular path of the vertex of the structure in formation.
- a peculiar feature of the welding device according to the invention is its capability to adapt to any shape of the winding of the metal wire 4 and in particular to any pitch of the winding spiral.
- the grooved rollers 16 constrained to the metal wire 4 lead the rotation of the support frame 5 according to the axis of the articulation 14, in order to follow the inclination of the metal wire 4 in every kind of spiral winding, in particular in the case of variable winding pitch.
- the welding member 6 is able to follow the joint between the bar 3 and the metal wire 4 thanks to the possibility to have a Cartesian movement according to two orthogonal axis, which allow to follow any curvilinear trajectory.
- the claimed method and device allow the realization of the cages also starting from stirrups suitably spaced one another along the longitudinal bars. Furthermore, it is possible to realize so-called interrupted spiral cages, of the type illustrated for instance in Patent Application EP 1469135.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wire Processing (AREA)
- Artificial Fish Reefs (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO2008A000507A IT1390746B1 (en) | 2008-08-05 | 2008-08-05 | WELDING DEVICE IN APPLIANCES FOR REALIZING METAL CAGES FOR REINFORCED CONCRETE |
PCT/IB2008/054883 WO2010015896A1 (en) | 2008-08-05 | 2008-11-20 | Welding method in machines for manufacturing metal cages for reinforced concrete and corresponding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2331275A1 true EP2331275A1 (en) | 2011-06-15 |
EP2331275B1 EP2331275B1 (en) | 2012-08-15 |
Family
ID=40454804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08875861A Not-in-force EP2331275B1 (en) | 2008-08-05 | 2008-11-20 | Welding method in machines for manufacturing metal cages for reinforced concrete and corresponding machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2331275B1 (en) |
DK (1) | DK2331275T3 (en) |
IT (1) | IT1390746B1 (en) |
WO (1) | WO2010015896A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108673014B (en) * | 2018-05-24 | 2020-06-12 | 南京溧水高新创业投资管理有限公司 | Bridge construction is with pier skeleton welding auxiliary assembly |
DK180334B1 (en) * | 2019-03-19 | 2020-12-04 | Gmt Robotics Aps | Assembly machine and method for assembling reinforced structures |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1372816A (en) * | 1919-08-04 | 1921-03-29 | Julius H Holmgreen | Bending-machine and method of bending |
DE2009509C3 (en) * | 1970-02-28 | 1981-10-22 | Ed. Züblin AG, 7000 Stuttgart | Machine for the continuous production of reinforcement cages for posts, masts or the like. made of reinforced concrete |
IT1141782B (en) | 1980-03-05 | 1986-10-08 | Rema Macchine Utensili Spa | CAGE FORMING MACHINE |
IT1216960B (en) | 1987-03-11 | 1990-03-14 | Grilli Mario Corsini Emilio Pa | PROCEDURE FOR THE MANUFACTURE OF CYLINDRICAL CAGES FOR ARMORED CEMENT |
WO2005084848A1 (en) * | 2004-03-02 | 2005-09-15 | M.E.P. Macchine Elettroniche Piegatrici Spa | Machine to produce reinforcement cages, and relative production method |
DE102004041736A1 (en) * | 2004-08-28 | 2006-03-02 | Ed. Züblin Ag | Manufacturing machine for continuous production of reinforcement cages for e.g. reinforced concrete pipes, masts, stakes, has welding equipment attached to radial adjustment mechanism which is provided with its own drive unit |
-
2008
- 2008-08-05 IT ITBO2008A000507A patent/IT1390746B1/en active
- 2008-11-20 WO PCT/IB2008/054883 patent/WO2010015896A1/en active Application Filing
- 2008-11-20 EP EP08875861A patent/EP2331275B1/en not_active Not-in-force
- 2008-11-20 DK DK08875861.0T patent/DK2331275T3/en active
Non-Patent Citations (1)
Title |
---|
See references of WO2010015896A1 * |
Also Published As
Publication number | Publication date |
---|---|
DK2331275T3 (en) | 2012-11-26 |
EP2331275B1 (en) | 2012-08-15 |
IT1390746B1 (en) | 2011-09-23 |
ITBO20080507A1 (en) | 2010-02-06 |
WO2010015896A1 (en) | 2010-02-11 |
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