NZ619778B2 - Movement device, particularly for cutting torches of the plasma type and the like - Google Patents
Movement device, particularly for cutting torches of the plasma type and the like Download PDFInfo
- Publication number
- NZ619778B2 NZ619778B2 NZ619778A NZ61977812A NZ619778B2 NZ 619778 B2 NZ619778 B2 NZ 619778B2 NZ 619778 A NZ619778 A NZ 619778A NZ 61977812 A NZ61977812 A NZ 61977812A NZ 619778 B2 NZ619778 B2 NZ 619778B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- cutting torch
- axis
- cutting
- movement device
- revolution
- Prior art date
Links
- 235000010599 Verbascum thapsus Nutrition 0.000 title claims abstract description 79
- 240000000969 Verbascum thapsus Species 0.000 title claims abstract description 15
- 210000002381 Plasma Anatomy 0.000 title abstract description 20
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000001808 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000670 limiting Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000001737 promoting Effects 0.000 description 1
- 230000003134 recirculating Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0241—Attachments between the welding or cutting element and the carriage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0247—Driving means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0288—Carriages forming part of a cutting unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/287—Supporting devices for electrode holders
Abstract
movement device (1), particularly for cutting torches of the plasma type, comprising a working head (2) that can move along three Cartesian axes (3, 4, 5) which are mutually perpendicular and supports a cutting torch (7) for cutting mechanical pieces and the like. Means (9) are provided for combined rotary and translational motion of the cutting torch (7) with respect to the working head (2) in order to vary the inclination of the cutting flow with respect to the mechanical piece or the like being worked on. The center of instantaneous rotation of the cutting torch (7), with respect to which the means (9) for combined rotary and translational motion operate, substantially coincides with the focal point (11) of the cutting torch (7). The means (9) for combined rotary and translational motion can comprise drive means (16, 23) integral in the translational motion with the working head. ed rotary and translational motion of the cutting torch (7) with respect to the working head (2) in order to vary the inclination of the cutting flow with respect to the mechanical piece or the like being worked on. The center of instantaneous rotation of the cutting torch (7), with respect to which the means (9) for combined rotary and translational motion operate, substantially coincides with the focal point (11) of the cutting torch (7). The means (9) for combined rotary and translational motion can comprise drive means (16, 23) integral in the translational motion with the working head.
Description
MOVEMENT DEVICE, PARTICULARLY FOR CUTTING TORCHES OF
THE PLASMA TYPE AND THE LIKE
The present invention relates to a movement device for plasma cutting
and the like, for cuts in two and three dimensions.
Nowadays, for metal cutting in general, such as steel and other
metallic alloys, or for cutting other materials, a huge variety of methods is
available which do not require physical contact between a tool and the piece
to be cut.
Of these methods, plasma cutting is known, which consists,
substantially, in ejecting a gas at high speed from a nozzle and creating an
electric arc in the gas between an electrode and the surface to be cut, in such
a manner as to transform the gas into plasma.
The plasma thus obtained transfers heat to the metallic material until
it is brought to the melting temperature and thus its continuity is broken.
In this technology, as in other, similar technologies, the nozzle
through which the plasma flow exits is provided on a cutting torch which is
supported by a movement device of the multi-body type which, by means of
a plurality of motors and kinematic linkages, enables the movement,
positioning and orientation in space of the torch.
Such technology is not however devoid of drawbacks, among which
is the fact that, if the torch has to follow a preset cutting path, conventional
movement devices do not allow a fluidity of movement of the focal point of
the torch which is such as to obtain a cut executed in continuous movement
which is sufficiently free from burring and cutting inaccuracies owing to
pauses in and/or resumptions of the plasma flow along the preset cutting
path.
Another drawback of the conventional technology consists in that, if
inclined cuts are required with continual changes of inclination, the inertia
of the individual rigid bodies that make up the above-mentioned multi-body
system and the continual accelerations and decelerations to which the
cutting torch is subjected result in inaccuracies of positioning in space of the
focal point of the torch, with consequent reduction in the quality of the cut
made.
This drawback is substantially due to the inertia of the system, in that,
for each degree of freedom of the system, there is an electric motor which is
generally mounted proximate to the joint on which the degree of freedom is
provided.
In this way, the electric motors, the mass of which is significant,
weigh down the system considerably thus forcing it to operate with reduced
acceleration and deceleration values, with consequent lengthening of
working times.
Another drawback of the movement devices described consists in
that, during the movement of the torch, the supply cable of the latter
undergoes a series of furls onto itself and tensions which are such as to
necessitate rotations of the cutting torch that are adapted to loosen this
cable, so as to prevent it from breaking.
In fact, typically, with current systems it is possible to make the
cutting torch perform at the most two or three turns on itself before the cable
breaks.
The aim of at least preferred embodiments of the present invention is
to provide a movement device that is capable of overcoming the limitations
and drawbacks of the known art and/or to at least provide the public with
useful choice.
Within this aim, an object of the present invention is to devise a
movement device that is particularly adapted to plasma cutting torches for
straight and inclined cuts but which can with suitable modifications also be
used for cutting technologies other than plasma cutting such as, for
example, laser cutting torches, gas cutting torches or oxyhydrogen flame
cutting torches.
The present invention provides a movement device for cutting
torches, comprising a working head that can move along three Cartesian
axes which are mutually perpendicular and support a cutting torch for
cutting mechanical pieces, means for the combined rotary and translational
motion of said cutting torch with respect to said working head being further
comprised in order to vary the inclination of the cutting flow with respect to
said mechanical piece. The center of instantaneous rotation of said cutting
torch with respect to which said means for combined rotary and translational
motion operate coincides substantially with the focal point of said cutting
torch wherein said means for combined rotary and translational motion
comprises drive means integral in translation motion with the sole working
head.
Further characteristics and advantages of the present invention will
become more apparent from the detailed description of a preferred, but not
exclusive, embodiment of a movement device, particularly for cutting
torches of the plasma type, which is illustrated by way of non-limiting
example in the accompanying drawings wherein:
Figure 1 is a partially sectional perspective view of the movement
device, particularly for cutting torches of the plasma type, according to the
invention;
Figure 2 is a rear elevation view of the movement device shown in
Figure 1;
Figure 3 is a plan view from above of the movement device shown in
Figure 1;
Figure 4 is a sectional view of the movement device shown in Figure
3, along the line IV-IV;
Figure 5 is a sectional view of the movement device shown in Figure
4, along the line V-V;
Figure 6 is a sectional view of the movement device shown in Figure
4, along the line VI-VI;
Figure 7 is a sectional view of the movement device shown in Figure
4, along the line VII-VII.
With reference to the figures, the movement device, particularly for
cutting torches of the plasma type, generally designated by the reference
numeral 1, comprises a working head 2 that can move along three Cartesian
axes 3, 4 and 5 which are mutually perpendicular and supports a cutting
torch 7 for cutting mechanical pieces and the like.
More precisely, as will be described in more detail later, the working
head 2 is associated with a frame 8 which supports a workstation that is
known to the person skilled in the art and is therefore not described in
detail.
Moreover, means are comprised for the combined rotary and
translational motion 9 of the cutting torch 7 with respect to the working
head 2 so as to vary the inclination of the cutting flow 10 with respect to the
piece being worked on.
According to the invention, the center of instantaneous rotation of the
cutting torch 7, with respect to which the means for combined rotary and
translational motion 9 operate, substantially coincides with the focal point
11 of the cutting torch 7.
In this way, during every movement of the cutting torch 7, which in
the exemplary embodiment shown here is of the plasma type but which in
other embodiments, not shown, can also be of the laser, gas, or oxyhydrogen
flame type, the cutting torch 7 is always trained on the same point without
ever deviating from or interrupting the preset cutting path.
Advantageously, in order to implement this characteristic, the cutting
torch 7 can rotate with respect to the working head 2 and, respectively,
about a first axis of revolution 12 which is substantially parallel to a first
Cartesian axis 4, passing through the focal point 11, and about a second axis
of revolution 13 which is substantially perpendicular to the first axis of
revolution 12.
More specifically, the working head 2 comprises a box-like body 14
which is slideably associated with the frame 8 along two straight guides,
which are not shown and belong to the frame 8, and are substantially
parallel, respectively, to a second and to a third Cartesian axis 3 and 5.
In this manner, the two straight guides lie on a plane the perpendicular
of which coincides with the first axis of revolution 12.
This box-like body 14 is able to perform a translational motion along
the first Cartesian axis 4 by means of a first rack-type coupling 15 which
can be actuated by first drive means 16 which are accommodated inside the
box-like body 14.
More precisely, the first drive means 16 and the first rack-type
coupling 15 comprise a first electric motor 17, which is associated with a
first speed reduction unit 18, on the output shaft of which a first pinion 19 is
keyed and engages a first rack 20 which is integral with the frame 8.
In addition the working head 2 comprises an impeller 21 which
supports the cutting torch 7 and is accommodated rotatably in the box-like
body 14 by means of a first gear 22 which can be actuated by second drive
means 23 which are accommodated in the box-like body 14.
More precisely, the first gear 22 and the second drive means 23,
which define part of the means for combined rotary and translational motion
9, comprise a second electric motor 24 which is associated with a second
speed reduction unit, not shown in the figures, on the output shaft of which
a second pinion 25 is keyed and engages a first gearwheel 26 which is
integral in rotation with the impeller 21.
As shown in the figures, the cutting torch 7 is associated with the
working head 2 by way of two supporting arms 27 and 28 of which the first
one is integral with the impeller 21 and the second one is associated with the
cutting torch 7.
More precisely, the first supporting arm 27 extends from the impeller
21 substantially parallel to the first axis of revolution 12 in the direction of
the region where the mechanical piece will be worked and eccentrically with
respect to the first axis of revolution 12.
Differently, the second supporting arm 28 is kinematically associated
with the first supporting arm 27 by way of an articulated quadrilateral
structure 29 which lies on a plane which is substantially parallel to the first
axis of revolution 12 and can be actuated by third drive means 30 which are
accommodated inside the box-like body 14 by means of mechanical
transmission elements which are defined inside the supporting arms 27 and
Advantageously, in this way, the cutting torch 7 is kinematically
connected to the mechanical transmission elements for its rotation about the
second axis of revolution 13 which is opposite to the direction of rotation of
the second supporting arm 28 relative to the first supporting arm 27.
More precisely, the third drive means 30 and the mechanical
transmission elements, which together with the articulated quadrilateral
structure 29 define part of the means for combined rotary and translational
motion 9, comprise a third electric motor 31 which is associated with a third
speed reduction unit, not shown in the figures, on the output shaft of which
a third pinion 32 is keyed and engages a second toothed wheel 33 which is
rotatably fitted on the shaft of the impeller 21.
More precisely, the second toothed wheel 33 is integral in rotation
with a third toothed wheel 34 which is rotatably fitted over the shaft of the
impeller 21 and associated kinematically with a screw-and-nut coupling 35,
for example of the recirculating ball type, of which at least a part is
accommodated in the first supporting arm 27 and which produces a
translational motion of a second rack 36 which engages two actuation
pinions 37 and 38 of the articulated quadrilateral structure 29.
In the embodiment proposed, the articulated quadrilateral structure 29
comprises two linkages 39 and 40, which are integral in rotation, at their
ends, with the actuation pinions 37 and 38 and with two driving pulleys 41
and 42 which are accommodated within the second supporting arm 28 and
one of which is connected, by way of a belt transmission 43, to a driven
pulley 44 which is provided on an actuation shaft 45 associated with a
supporting base 46 of the cutting torch 7.
Conveniently, in the proposed embodiment, a belt tightening pulley
50 is provided.
Conveniently, in order to make the center of instantaneous rotation of
the cutting torch 7, with respect to which the means for combined rotary and
translational motion 9 operate, coincide with the focal point 11 of the
cutting torch 7, the axis of the actuation shaft 45 coincides with the second
axis of revolution 13 and the distance between the pivots of each one of the
linkages 39 and 40 is equal to the distance between the focal point 11 and
the second axis of revolution 13, so that the linkages 39 and 40 are always
oriented parallel to the second axis of revolution 13.
In this way, all the drive means 16, 23 and 30, including their
electrical wiring, are integral in translational motion with the sole working
head 2 thus leaving the cutting torch 7 free to move with respect to them
without their inertia influencing the movement of the cutting torch 7.
Moreover, in order to prevent damage to the cutting torch 7 in the
event of accidental collisions with the mechanical piece or the like being
worked, collision prevention means 51 are provided which comprise elastic
means 52, provided for example by traction springs, which are associated
both with the main body 53 of the cutting torch 7, which can be inserted
with a shape coupling and in abutment in a hole 54 formed on the
supporting base 46, and with the supporting base 46 so as to keep this main
body 53 in abutment in the hole 54.
In this manner, the main body 53 and thus the cutting torch 7 can be at
least partially extracted from the hole 54 in contrast to the action of the
elastic means 52 in the event of a collision.
Means for preventing the rotation of the supply cable of the cutting
torch 7 can advantageously be provided comprising a slider 61 which is
slideably accommodated in a tubular body 60 that extends from the impeller
21 on the side opposite to that of the cutting torch 7 in contrast to and due to
the action of second elastic means 63 which consist, for example, of a
helical spring which is interposed between the slider 61 and the impeller 21.
More precisely, the tubular body 60 extends along the first axis of
revolution 12, passing through all of the impeller 21. The slider 61 is thus
integral in rotation with the tubular body 60 due to grooved guides 62,
which prevent rotations relative to each other, allowing them to perform
translational movements only, and the supply cable of the cutting torch 7,
which for the sake of graphic simplicity is not shown, is integral with the
slider 61, making it slide along the tubular body 60 when the cable is live.
Operation of the movement device 1, particularly for cutting torches
of the plasma type or the like, is described hereinafter.
The positioning of the cutting torch 7 in the three-dimensional space
identified by the triplet of Cartesian axes 3, 4 and 5 occurs by means of the
sliding of the working head 2 along the straight guides of the frame 8, which
enable the translational motion of the working head 2 on a plane that is
substantially parallel to the working surface on which the mechanical piece
to be worked is placed, and by means of the actuation of the first drive
means 16, which enable the translational motion of the working head 2
away from or toward the mechanical piece to be worked.
During such translational movements, the cutting torch 7 can undergo
combined rotations about the two axes of revolution 12 and 13 so that the
center of instantaneous rotation of these combined rotations coincides with
the focal point 11 of the cutting torch 7.
More precisely, this kinematic restriction comes about thanks to the
articulated quadrilateral structure 29, by way of which the same rotation
imposed on the second supporting arm 28 relative to the first supporting arm
27 is imposed in the opposite direction on the actuation shaft 45, which is
responsible for the rotation of the cutting torch 7 about the second axis of
revolution 13.
In this way the plasma flow of the cutting torch 7 can undergo
variations in orientation with respect to the mechanical piece being worked
without physically moving the focal point of the cutting torch 7.
By combining this rotation about the second axis of revolution 13
with the rotation of the impeller 21 about the first axis of revolution 12, the
plasma flow can function in a working cone the vertex of which coincides
with the focal point of the cutting torch 7, as shown in Figure 2.
For example, in a possible configuration of the movement device 1,
such cone can have an angular extension of 110°.
During the movement of the cutting torch 7, its supply cable can
undergo tensions which may lead to the breakage of the cable, if the
rotation-preventing means described previously were not provided.
In fact, following the tensioning of the supply cable, the slider 61, to
which the cable is fixed, slides along inside the tubular body 60 in contrast
to the action of the second elastic means 63 which are compressed,
promoting the tensioning of the cable.
Once this tensioning has ceased, as a consequence of the second
elastic means 63, the supply cable re-enters the tubular body 60.
In this manner, it is possible to prevent the tensioning of the cable
from making the cutting torch 7 perform a high number of turns with respect
to the working head 2 without the supply cable risking breakage.
In practice it has been found that the movement device, particularly
for cutting torches of the plasma type, according to the invention, fully
achieves the intended aim and objects in that it makes it possible to move a
cutting torch in a fluid and constant manner without the inertias of the
motors influencing the precision of positioning.
In particular, the positioning of all the motors in a position away from
the moving elements of the cutting device makes it possible to not have
significant masses in motion and to concentrate the inertial masses in a
single point.
This enables the movement device according to the invention to
operate with high acceleration and deceleration values, so as to reduce
working times with respect to what is possible with the known art, without
losing precision of cutting.
The movement device, particularly for cutting torches of the plasma
type, thus conceived is susceptible of numerous modifications and
variations, all of which are within the scope of the appended claims.
Moreover, all the details may be substituted by other, technically
equivalent elements.
In practice the materials employed, provided they are compatible with
the specific use, and the contingent dimensions and shapes, may be any
according to requirements and to the state of the art.
The disclosures in Italian Patent Application No. MI2011A001684
from which this application claims priority are incorporated herein by
reference.
Where technical features mentioned in any claim are followed by
reference signs, those reference signs have been included for the sole
purpose of increasing the intelligibility of the claims and accordingly, such
reference signs do not have any limiting effect on the interpretation of each
element identified by way of example by such reference signs.
The term ‘comprising’ as used in this specification and claims means
‘consisting at least in part of’. When interpreting statements in this
specification and claims which include the term ‘comprising’, other features
besides the features prefaced by this term in each statement can also be
present. Related terms such as ‘comprise’ and ‘comprised’ are to be
interpreted in similar manner.
Claims (11)
1. A movement device for cutting torches comprising a working head that can move along three Cartesian axes which are mutually perpendicular and supports a cutting torch for cutting mechanical pieces, means for the 5 combined rotary and translational motion of said cutting torch with respect to said working head being further comprised in order to vary the inclination of the cutting flow with respect to said mechanical piece, the center of instantaneous rotation of said cutting torch with respect to which said means for combined rotary and translational motion operate coincides substantially 10 with the focal point of said cutting torch, wherein said means for combined rotary and translational motion comprises drive means integral in translation motion with the sole working head.
2. The movement device according to claim 1, characterized in that said cutting torch can rotate with respect to said working head, respectively, 15 about a first axis of revolution, which is substantially parallel to a first one of said Cartesian axes and about a second axis of revolution, which is substantially perpendicular to said first axis of revolution, said focal point being arranged along said first axis of revolution.
3. The movement device according to claim 1 or 2, characterized in 20 that said working head comprises a box-like body which is slideably associated with a frame along two straight guides that belong to said frame and are substantially parallel, respectively, to a second one and a third one of said Cartesian axes, said box-like body being able to perform a translational motion along said first Cartesian axis by means of a first rack- 25 type coupling which can be actuated by first drive means accommodated inside said box-like body.
4. The movement device according to claim 3, characterized in that said first drive means and said first rack-type coupling comprise a first electric motor, which is associated with a first speed reduction unit, on the 30 output shaft of which a first pinion is keyed and engages a first rack which is integral with said frame.
5. The movement device according to any one of the preceding claims, characterized in that said working head comprises an impeller which supports said cutting torch and is accommodated rotatably within said box- 5 like body by means of a first gear which can be actuated by second drive means which are accommodated in said box-like body, said first gear and said second drive means defining part of said means for combined rotary and translational motion.
6. The movement device according to claim 5, characterized in that 10 said second drive means and said first gear comprise a second electric motor, which is associated with a second speed reduction unit on the output shaft of which a second pinion is keyed and engages a first toothed wheel which is integral in rotation with said impeller.
7. The movement device according to any one of the preceding 15 claims, characterized in that said cutting torch is associated with said working head by way of two supporting arms, of which the first one is integral with said impeller and the second one is associated with said cutting torch, said first supporting arm extending from said impeller substantially parallel to said first axis of revolution eccentrically with respect to said first axis of revolution and said second supporting arm being associated kinematically with said first supporting arm by way of an articulated quadrilateral structure, which lies on a plane which is substantially parallel to said first axis of revolution and can be actuated by third drive means, which are accommodated within said box-like body, by means of 25 mechanical transmission elements which are defined inside said supporting arms, said articulated quadrilateral structure, said third drive means and said mechanical transmission elements defining part of said means for combined rotary and translational motion, said cutting torch being connected kinematically to said mechanical transmission elements for its opposite 30 rotation about said second axis of revolution with respect to the direction of rotation of said second supporting arm relative to said first supporting arm.
8. The movement device according to claim 7, characterized in that said third drive means and said mechanical transmission elements comprise a third electric motor, which is associated with a third speed reduction unit 5 on the output shaft of which a third pinion is keyed and engages a second toothed wheel which is fitted rotatably on the shaft of said impeller, said second toothed wheel being integral in rotation with a third toothed wheel, which is fitted rotatably on the shaft of said impeller and is associated kinematically with a screw-and-nut coupling which is accommodated at 10 least partly in said first supporting arm and produces a translational motion of a second rack, which engages two actuation pinions of said articulated quadrilateral structure.
9. The movement device according to claim 8, characterized in that said articulated quadrilateral structure comprises two linkages, which are 15 integral in rotation, at their ends, with said actuation pinions and with two driving pulleys which are accommodated within said second supporting arm and one of which is connected, by way of a belt transmission, to a driven pulley, which is provided on an actuation shaft associated with a supporting base of said cutting torch, the axis of said actuation shaft coinciding with 20 said second axis of revolution, the distance between the pivots of each one of said linkages being equal to the distance between said focal point and said second axis of revolution, said linkages being oriented parallel to said second axis of revolution.
10. The movement device according to any one of the preceding 25 claims, characterized in that it comprises means for preventing the collision of said cutting torch with said mechanical piece.
11. The movement device according to claim 10, characterized in that said cutting torch comprises a main body which can be inserted with a shape coupling and in abutment in a hole which is formed in said supporting base, 30 and in that said collision prevention means comprise elastic means which
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT001684A ITMI20111684A1 (en) | 2011-09-19 | 2011-09-19 | HANDLING DEVICE, PARTICULARLY FOR PLASMA AND SIMILAR CUTTING TORCHES. |
PCT/EP2012/067700 WO2013041404A2 (en) | 2011-09-19 | 2012-09-11 | Movement device, particularly for cutting torches of the plasma type and the like |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ619778A NZ619778A (en) | 2016-02-26 |
NZ619778B2 true NZ619778B2 (en) | 2016-05-27 |
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