EP3666412A1 - Expanseur amélioré pour élargir des tuyaux métalliques - Google Patents
Expanseur amélioré pour élargir des tuyaux métalliques Download PDFInfo
- Publication number
- EP3666412A1 EP3666412A1 EP19204024.4A EP19204024A EP3666412A1 EP 3666412 A1 EP3666412 A1 EP 3666412A1 EP 19204024 A EP19204024 A EP 19204024A EP 3666412 A1 EP3666412 A1 EP 3666412A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- expander
- flexible rods
- drum
- flexible
- rods
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
- B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
- B21D41/026—Enlarging by means of mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
Definitions
- the present invention relates to an improved expander for expanding metal pipes.
- expander means a machine capable of performing transversal expansion or widening of the inner space of metal pipes used for various purposes, particularly but not exclusively for suppling refrigerant or heating fluid inside the fins of finned pack heat exchangers.
- An expander of this type is described in Italian patent No. 1426936 by the Applicant and comprises a plurality of flexible rods, which are fed in parallel towards a corresponding plurality of parallel pipes to axially engage therein the respective expander mandrels placed at the front end of the flexible rods.
- the flexible rods consist of a metal wire spring wound in a cylindrical helix in which a braided steel wire cord axially extends, the front end of which is fixed to the rear end of the expander mandrel.
- expander mandrels There may be two types of expander mandrels, one capable of expanding the pipe by means of axial pushing of a larger diameter mandrel head into the inner cavity of the pipe (push mandrel), the other capable of expanding by inserting a smaller diameter head into the inner cavity of the pipe, which head is then expanded and pulled back from its initial position (pull mandrel).
- the first type of mandrel has a rigid body with a rear end fixed to the front end of the braided wire cord, as mentioned, and a front end to which said larger diameter head is fixed.
- the second type of mandrel consists of two axially consecutive portions with an interposed spring, the rear portion of which is fixed to the front end of the braided wire cord and extends frontally with a further braided steel wire cord which ends in a flared front end towards a terminal head, while the front end can slide axially over said further cord and said flared front end and frontally carries an expandable nose which can abut axially against said terminal head.
- the terminal head of the mandrel can thus be inserted with compressed spring and non-expanded nose into the pipe to be expanded and then be pulled back to determine, by exploiting the extension of the spring, the sliding of the flared front end of the mandrel inside the nose with consequent expansion of the latter, and the progressive extraction of the nose itself for the desired expansion of the inner cavity of the pipe.
- WO 2010/115427 A1 describes a metal pipe expansion device which, similarly to that defined in the preamble of claim 1 of the present application, comprises a plurality of flexible rods which are fed in parallel towards a corresponding plurality of parallel pipes to axially insert therein respective expanding mandrels placed at the front end of the flexible rods.
- the type of flexible rods used is not defined.
- JP 2015 085383 A describes a pipe expansion unit, which has the same features as WO 2010/115427 A1 .
- the expander shown as a whole in figure 1 comprises a supporting frame 1 which supports a moving assembly 2 of flexible rods 3 from which expander mandrels 4 extend, which can be inserted into the axial cavities of the respective pipes 5 the transversal expansion of which is desired.
- the aforesaid pipes 5 are kept in position aligned with the expander mandrels 4 by a support 6 fixed to a front end of the frame 1.
- the expander mandrels 4 can be of two types, shown in figures 2-3 and 4-9 , respectively.
- the expander mandrel in figures 2-3 is of the push type, i.e. is able to operate the transverse expansion of pipe 5 by means of axial pushing.
- the mandrel comprises a rigid body 7 with a rear end fixed to the front end of a respective flexible rod 3 and a front end ending in a substantially truncated-cone-shaped expansion head 8 with a terminal front 9 of diameter smaller than that of the inner cavity of pipe 5 and a section 10 behind of a larger diameter than that of the aforesaid cavity.
- the mandrel in figures 2-3 may be inserted into the cavity itself and carry out the transverse expansion of the inner cavity of the pipe by means of the enlarged section 10 of the head 8.
- the expander mandrel in figures 4-9 is of the pulling type, instead, i.e. it is able to operate the transversal expansion of the inner cavity of pipe 5 by means of unforced insertion into the aforesaid cavity and subsequent expansion and extraction in an expanded state of the terminal head of the mandrel outside the cavity of the pipe.
- the mandrel is made of two axially aligned parts 11 and 12 with the interposition of a helical metal spring 13.
- the rear part 11 is fixed to the front end of a respective flexible rod 3 and has a front extension 14 ending with a truncated-cone-shaped flare 15 and finally with a terminal head 16.
- the front part 12 is mounted axially sliding on the aforesaid front extension 14 and ends in front with an expandable nose 17 with radial petals, which in non-expanded position has outer transverse dimensions smaller than the transverse dimensions of the inner cavity of the pipe 5, while in expanded position it may assume outer transverse dimensions larger than the transverse dimensions of said cavity.
- the mandrel in figures 4-9 initially outside the inner cavity of the pipe with the spring 13 in resting position, the front part 12 retracted with respect to the truncated-cone-shaped flare of the extension 14 and the non-expanded nose 17 ( figure 4 ), may be inserted with the terminal head 16 into the cavity of the pipe 5 and then pushed with the front part 12 along the extension 14 and its truncated-cone-shaped flare 15 ( figure 6 ) with consequent compression of the spring 13 and progressive expansion of the nose 17 up to a transversal dimension greater than the transversal dimension of the inner cavity of pipe 5.
- the corresponding flexible rods 3 consist of respective solid stems or harmonic steel cables with circular cross-section and smooth outer wall. Their movement for the insertion of the mandrels 4 in the cavities of the pipes 5 and their extraction from the pipes themselves is provided by the movement assembly 2, the details of which are shown in figures 10-14 .
- the movement assembly 2 comprises a plurality of driving elements (50) arranged side-by-side, one for each flexible rod 3 to be moved, each of which is formed by a set of pairs of slotted gears 21-22 superimposed in pairs ( figures 10 , 11 and 13 ), which define grooves 23 intended for the passage and driving of a flexible rod 3 ( figures 10 , 13 and 14 ).
- the lower gears 22 are rotationally supported fixed pins 24 taken to a fixed position by intermediate plates 25 placed between the various gear sets ( figures 10 , 11 , 12 and 14 ) and are motorized by means of a drive shaft (not shown) on which a drive gear 26 and an idle gear 27 are mounted ( figures 10 , 11 and 13 ), while the upper gears 21 are rotationally supported by pins 28 mounted on rectangular plates 29 ( figures 10 , 11 and 13 ), which are integral with trapezoidal plates 30 supported in vertically movable manner by the intermediate plates 25.
- the trapezoidal plates 30 are biased or in any case can be controlled to move upwards by elastic or hydraulic means 31 placed at the two ends ( figures 10 and 13 ) but can be kept in a lowered position, suited for the engagement of the upper gears 21 with the lower gears 22, by means of L-shaped levers 32 pivoted in 33 on the intermediate plates 25 and which can be actuated between engagement and disengagement positions with respect to the trapezoidal plates 30 by means of hydraulic cylinder-piston units 34 with rotating ends on pins 35 and 36 carried by the intermediate plates 25 and by the levers 32, respectively ( figures 10 , 11 and 13 ).
- the upper gears 21 are, in turn, lowered and mesh with the lower gears 22 and may receive motion from the latter and thus cause the movement (either forward or backward) of the flexible rods inserted in the grooves 23, while with the trapezoidal plates raised following the disengagement of the levers 32 by means of the cylinder-piston assemblies 34, the upper gears 21 are, in turn, raised and disengaged by the lower gears 22 with consequent cessation of movement of the flexible rods 3.
- By independently controlling the cylinder-piston assemblies 34 it is thus possible to control the advancement or retraction movement of the flexible rods 3 and the corresponding mandrels 4 in equally independent manner.
- the movement assembly 2 takes the flexible rods 3 from a coil wrapped in a large drum 41 and then returns them to the drum itself after expanding.
- the taking and the returning depend on the direction of rotation imparted to the slotted gears 21 and 22.
- the drum 41 is shown in more detail in figures 15-17 , where it is seen to comprise three circular perforated plates 42 which form the two sides and a middle separating wall of the drum itself.
- the lower parts of the two sides are fixed to frame 1 by means of brackets 43, as also shown in figure 1 .
- each side plate and the middle plate there are two spiral-shaped sequences of idle rolls 44 ( figure 16 ), each of which is provided with parallel radial fins 45 which form grooves 46 for the housing of respective flexible rods 3 which extend longitudinally along all or part of the overall extension of the sequences of rolls.
- the expander assembly 2 With the levers 32 in the operating position of figures 10 and 13 , progressively takes suitable lengths of the rods 3 from the drum 41 until the mandrel 4 is inserted into the pipes to be expanded. If the number of pipes to be expanded is lower than that of the available mandrels, by appropriately choosing the position of the levers 32 by virtue of the cylinder-piston assemblies 34, the engagement of only one part of the gear pairs 21-22 is determined and therefore the advancement of only one part of the flexible rods 3, more precisely of those the mandrels of which must engage the inner cavities of pipes 5 for their radial expansion.
- the forced advancement of the rods, and thus of the mandrels, is sufficient to perform the expansion of pipe 5, after which the motion of the grooved gears 21-22 is reversed and the withdrawn lengths of rods are rewound on the drum 41.
- the advancement of the flexible rods 3 is only used to insert the terminal head of the mandrel, with the nose 13 still not expanded, into pipe 5 in which then the expansion of the nose 13, determined by the further advancement of the rod 3, determines the expansion of the pipe.
- the successive retraction of the rods under the control of movement assembly 2 determines the radial expansion of the inner cavity of pipe 5 by virtue of the enlarged nose until the mandrel exits from the pipe, which is the end of the expansion operation.
- the rod lengths previously taken from drum 4 and the rod lengths previously taken from drum 41 are finally rewound into the drum itself.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102018000010355A IT201800010355A1 (it) | 2018-11-15 | 2018-11-15 | “Mandrinatrice perfezionata per l’espansione di tubi metallici” |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3666412A1 true EP3666412A1 (fr) | 2020-06-17 |
EP3666412B1 EP3666412B1 (fr) | 2021-08-04 |
Family
ID=65496892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19204024.4A Active EP3666412B1 (fr) | 2018-11-15 | 2019-10-18 | Expanseur amélioré pour élargir des tuyaux métalliques |
Country Status (4)
Country | Link |
---|---|
US (1) | US20200156138A1 (fr) |
EP (1) | EP3666412B1 (fr) |
CA (1) | CA3059310A1 (fr) |
IT (1) | IT201800010355A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117620016A (zh) * | 2023-12-04 | 2024-03-01 | 广东博益空调配套设备有限公司 | 一种卧式胀管机 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789648A (en) * | 1972-12-27 | 1974-02-05 | Tridan Tool & Machine | Portable tube expander |
US5916321A (en) * | 1998-09-04 | 1999-06-29 | Tridan International, Inc. | Rod driver gear for a tubing expander |
WO2010115427A1 (fr) | 2009-04-06 | 2010-10-14 | Michael Davidsen | Machine pour l'élargissement de conduites |
US20130186166A1 (en) * | 2012-01-20 | 2013-07-25 | Kaydon Corporation | Tube forming machine |
EP2786816A1 (fr) * | 2013-04-05 | 2014-10-08 | CMS Costruzione Macchine Speciali S.r.l. | Machine à tambour pour élargir les tubes |
JP2015085383A (ja) | 2013-11-01 | 2015-05-07 | 株式会社EBox研究所 | 引抜き式拡管ユニット、装置、方法、及び熱交換器 |
-
2018
- 2018-11-15 IT IT102018000010355A patent/IT201800010355A1/it unknown
-
2019
- 2019-10-18 EP EP19204024.4A patent/EP3666412B1/fr active Active
- 2019-10-21 CA CA3059310A patent/CA3059310A1/fr not_active Abandoned
- 2019-11-06 US US16/675,390 patent/US20200156138A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789648A (en) * | 1972-12-27 | 1974-02-05 | Tridan Tool & Machine | Portable tube expander |
US5916321A (en) * | 1998-09-04 | 1999-06-29 | Tridan International, Inc. | Rod driver gear for a tubing expander |
WO2010115427A1 (fr) | 2009-04-06 | 2010-10-14 | Michael Davidsen | Machine pour l'élargissement de conduites |
US20130186166A1 (en) * | 2012-01-20 | 2013-07-25 | Kaydon Corporation | Tube forming machine |
EP2786816A1 (fr) * | 2013-04-05 | 2014-10-08 | CMS Costruzione Macchine Speciali S.r.l. | Machine à tambour pour élargir les tubes |
JP2015085383A (ja) | 2013-11-01 | 2015-05-07 | 株式会社EBox研究所 | 引抜き式拡管ユニット、装置、方法、及び熱交換器 |
Also Published As
Publication number | Publication date |
---|---|
EP3666412B1 (fr) | 2021-08-04 |
US20200156138A1 (en) | 2020-05-21 |
IT201800010355A1 (it) | 2020-05-15 |
CA3059310A1 (fr) | 2020-05-15 |
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