WO2014122100A1 - Appareil et procédé de récupération de brasure - Google Patents

Appareil et procédé de récupération de brasure Download PDF

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Publication number
WO2014122100A1
WO2014122100A1 PCT/EP2014/052065 EP2014052065W WO2014122100A1 WO 2014122100 A1 WO2014122100 A1 WO 2014122100A1 EP 2014052065 W EP2014052065 W EP 2014052065W WO 2014122100 A1 WO2014122100 A1 WO 2014122100A1
Authority
WO
WIPO (PCT)
Prior art keywords
solder
dross
chamber
outlet
impeller
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.)
Ceased
Application number
PCT/EP2014/052065
Other languages
English (en)
Inventor
Limaye ATUL
Jog SUNILDUTTA
Simon Garve NORMAN
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.)
EVS INT Ltd
Original Assignee
EVS INT Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US14/765,764 priority Critical patent/US9976198B2/en
Priority to RU2015137297A priority patent/RU2015137297A/ru
Priority to EP14702832.8A priority patent/EP2953758B1/fr
Priority to BR112015018627A priority patent/BR112015018627A2/pt
Priority to JP2015555741A priority patent/JP2016514199A/ja
Priority to MX2015010147A priority patent/MX381580B/es
Application filed by EVS INT Ltd filed Critical EVS INT Ltd
Priority to ES14702832T priority patent/ES2808549T3/es
Priority to CN201480007614.0A priority patent/CN104968464B/zh
Publication of WO2014122100A1 publication Critical patent/WO2014122100A1/fr
Priority to IL240088A priority patent/IL240088A0/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B23K3/00—Tools, devices or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/08—Auxiliary devices therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C22B7/003—Dry processes only remelting, e.g. of chips, borings, turnings; apparatus used therefor

Definitions

  • the present disclosure relates to industrial soldering methods and devices, and in particularly relates to a method and a device for solder recovery from dross.
  • dross primarily being formed of oxides of tin and good solder.
  • the generation of dross is higher in a Sn— Ag— Cu alloy (Pb-free solder) than in a Sn— Pb solder (leaded solder).
  • Dross collected from industrial soldering contains a good amount of usable solder and an oxidized residue, which should be disposed.
  • the oxidized residue cannot be completely removed, and the oxidized residue still contains substantial amount of solder.
  • a conventional method of recovering solder from dross is through heating the dross and agitating the heated dross.
  • the solder is collected subsequently after the operator has removed the upper oxidized residue with a ladle.
  • this solder recovering method in addition to removing the oxidized residue, also collects the usable solder. Further, as the process is more or less manual, it demands high level of user skill. Still, the efficiency is not what is expected.
  • US2010187732 discloses a solder recovery device including a melter which melts solder dross stored in a melting crucible, an agitation unit which agitates the melted solder dross, so as to separate the melted solder dross up and down into an oxidized residue and a recycled solder in the melting crucible, and a suction unit which sucks the oxidized residue generated by the agitation, the suction unit sucking the oxidized residue in an upper portion of the melting crucible to be removed.
  • W09525823 discloses an apparatus and a method for recovering solder from dross. Dross is poured into a heated chamber (1 ). The heated dross is then compressed by a piston (21 ) to force good solder out of the dross into a collecting tray (17), also referred to as a drain tray.
  • the invention provides an apparatus for solder recover, comprising:
  • a chamber for receiving dross the chamber being provided with an inlet for dross and an outlet through which recovered solder can pass;
  • the invention provides a method of recovering solder from dross, the method comprising the steps of
  • dross i) introducing dross into a chamber being provided with an inlet for dross and an outlet through which recovered solder can pass; ii) heating the dross;
  • Figure 1 illustrates a schematic representation of a solder recovery device (solder recovery device), in accordance with an embodiment of the present disclosure
  • Figure 2 illustrates a top view of the solder recovery device of Figure 1 showing an impeller, in accordance with an embodiment of the present disclosure
  • Figure 3 illustrate another schematic representation of the solder recovery device 100 in operation, in accordance with an embodiment of the present disclosure
  • Figure 4 illustrates another schematic representation of the solder recovery device of Figure 1 with a filter device, in accordance with an embodiment of the present disclosure
  • Figure 5 illustrates removal of residue from the solder recovery device of Figure 1 following solder recovery, in accordance with an embodiment of the present disclosure
  • Figure 6 illustrates an actual representation of a solder recovery device showing a tilting arrangement, in accordance with an embodiment of the present disclosure
  • Figure 7 illustrates an actual representation of the impeller of the solder recovery device of Figure 6, in accordance with an embodiment of the present disclosure
  • Figure 8 illustrates an actual representation of the solder recovery device of Figure 6 showing the coupling of a motor with a rotor shaft of the solder recovery device, in accordance with an embodiment of the present disclosure
  • Figure 9 illustrates another actual representation of the solder recovery device of Figure 6 showing an output section of the solder recovery device, in accordance with an embodiment of the present disclosure
  • FIG 10 illustrates various representations of the filter device of the solder recovery device of Figure 6, in accordance with an embodiment of the present disclosure
  • Figure 1 1 is a photograph of a complete unit according to the invention.
  • Figure 12 is a photograph of dross being loaded into the inlet hopper of the device.
  • Figure 13 is a photograph of recovered solder pouring from the outlet of the device into a solder collection tray
  • Figure 14 is a photograph of the filter unit of the apparatus.
  • Figure 15 is a photograph of the filter unit, showing the filtration medium inside
  • Figure 16 shows ingots of solder recovered from dross (left hand), together with waste oxide by-product (right hand).
  • dross consists of pockets of good solder which are surrounded by a crust-like envelope of tin and lead oxides (in the case of lead solder) or other metal oxides (in the case of lead-free solder).
  • the oxide crust bursts and liquid solder can escape.
  • any free solder in the dross removed from the solder bath will also be recovered.
  • the dross is heated and compressed with a piston. This leads to greater recovery of good solder compared with simply heating. Using this procedure, recovery of between 50 to 75 % of the available solder is possible.
  • the apparatus of the invention comprises a chamber for receiving dross, the chamber being provided with an inlet for dross and an outlet through which recovered solder can pass; a heater for heating dross in the chamber and an agitator inside the chamber for agitating heated dross, to separate good solder from the residue.
  • the chamber (also referred to as the "solder pot") may be of any suitable shape, but is typically generally cylindrical with a frustoconical lower end. This arrangement facilitates drainage of the solder from the chamber after agitation.
  • the chamber may be formed of any suitable material, but necessarily must be capable of withstanding the temperatures employed during the process.
  • metal is preferred, and stainless steel is more preferred.
  • the inlet (or “input section") is generally provided at or near the top of the chamber, so that dross may be fed into the chamber by gravity.
  • the outlet (or “output section”) is generally provided at or near the base of the chamber. This enables good solder to be drained out of the chamber under the influence of gravity. In a preferred embodiment, the outlet is provided at the base of a frustoconical lower section of the chamber, to facilitate complete drainage of good solder from the chamber.
  • the heater can be any conventional heater known in the art, and can be, for example, an electrical heating element disposed either inside the chamber or around the outside of the chamber (the latter being preferred).
  • the chamber can be, and preferably is, jacketed with insulating material to provide greater thermal stability and reduce power consumption. Heating by means of gas jets etc. is also a possibility.
  • the agitator preferably provides mechanical agitation to the dross contained within the chamber. This may be in the form of a vertical mashing motion, or a side-to-side motion, but preferably is provided by an agitator adapted to rotate within the chamber, such as a paddle or impeller.
  • FIG. 1 illustrates a schematic representation of a solder recovery device (solder recovery device) 100, in accordance with an embodiment of the present disclosure.
  • the solder recovery device includes an input section 102, a processing section 104 flow connected to the input section 102, and an output section 106 flow connected to the processing section 104.
  • dross is poured into the solder recovery device 100 through the input section 102, which may be a hopper.
  • the processing section 104 includes a solder pot 108, which is enclosed in an enclosure 1 10.
  • the dross reaches the solder pot 108 where it is heated at high temperatures so as to melt the dross.
  • the temperature inside the solder pot 108 depends on the melting point of the dross poured into the solder recovery device 100.
  • the dross poured into the solder recovery device 100 is heated up to a temperature ranging from about 250°C to 400 °C.
  • the temperature may further be increased.
  • the solder recovery device 100 preferably includes at least one motor 1 12, whose drive shaft (shown in Fig. 8) is coupled to a rotor shaft 1 14, which passes through the solder pot 108 where the dross is to be heated.
  • an impeller 1 16 having one or more agitator blades is coupled to the rotor shaft 1 14.
  • the motor 1 12, via the rotor shaft 1 14, rotates the impeller 1 16 in a clockwise/anticlockwise direction repeatedly so as to separate the dross from the good solder.
  • a geared motor powered by alternating current (AC) or direct current (DC) can be used.
  • AC alternating current
  • DC direct current
  • the present disclosure is not limited to any extent by the choice of the motor that is implemented for the purpose.
  • the good solder separated from the dross is drained out of the output section 106 via a drain valve 1 18.
  • the output section 106 is cooled by a cooling unit, such as a fan (shown in Fig. 3).
  • the output section 106 includes a filter device (shown in Fig. 4), which filters the solder before the solder leaves the output section 106 via the drain valve 1 18 into an ingot tray 120 (or drain tray).
  • solder is separated from the dross and is recovered.
  • the dross that is left inside the solder pot 108 after the solder recovery is residue. This residue is removed from the solder pot 108 using steps discussed in the later part of the description.
  • the sequence of heating, stirring and draining is operated under computer or microprocessor control. After the operator has introduced dross into the chamber, they initiate the microprocessor or computer, which controls the heating and stirring at the appropriate rates to obtain optimum good solder recovery, and then also controls the draining of the solder into the ingot tray.
  • FIG 2 illustrates a top view of the solder recovery device 100 of Figure 1 showing the impeller 1 16, in accordance with an embodiment of the present disclosure.
  • the impeller 1 16 is capable of rotating in clockwise/anticlockwise directions via the motor 1 12 (shown in Fig. 1 ), thereby producing an agitating flow and centrifugal forces inside the solder pot 108. These forces and flows separate the solder from the dross.
  • the impeller 1 16 is coupled to the rotor shaft 1 14 of the motor 1 12.
  • the impeller 1 16 has three blades.
  • the number of blades may be less than or more than the number of blades as disclosed in the present embodiment, depending on the requirement in particular setting.
  • the blades of the impeller 1 16 are attached offset to a central axis of the rotor shaft 1 14 so as to provide a slanted
  • the impeller 1 16 is rotated in a direction opposite to the direction of the slant of the blades so as to provide a screw conveyor type action. For example, if the blades are offset towards left of the rotor shaft 1 14 so as to give a clockwise configuration when seen in line with the axis of the rotor shaft 1 14 from a side where the impeller is attached to the rotor shaft 1 14. With such a configuration of the blades, the motor 1 12 is configured to rotate in the opposite direction, i.e., in the anti-clockwise direction.
  • FIG 3 illustrate another schematic representation of the solder recovery device 100 in operation, in accordance with an embodiment of the present disclosure.
  • the cooling unit is shown as a fan 302, which is placed near the output section 106 of the solder recovery device 100 from where the good solder 304 drains out.
  • the fan 302 could be an external fan or a fan inbuilt in the solder recovery device 100 itself.
  • the drain valve 1 18 lets the good solder 305 flow out of the drain valve 1 18 automatically when the fan 302 is stopped. The stop/flow of the good solder through the drain valve 1 18 is governed by the conduction of heat inside the solder pot 108.
  • FIG 4 illustrates a schematic representation of the solder recovery device 100 of Figure 1 with a filter device 402, in accordance with an embodiment of the present disclosure.
  • the output section 106 of the solder recovery device 100 includes the filter device 402, which filters the solder that is drained out of the solder recovery device 100 through the output section 106.
  • the filter device 402 is positioned in the output section 106 just above the drain valve 1 18.
  • the filter device 402 is a removable gauze filter having at least a perforated steel disc and stainless steel wool trapped inside the filter device 402 by the perforated steel disc (shown in Fig. 10).
  • the filter device 402 can be removed and cleaned after a few cycles of solder removal and may also be replaced after completing its cycle.
  • a handle 404 is provided which is attached to the filter device 402 and allows attachment/detachment of the filter device 402 to/from the solder recovery device 100.
  • FIG. 5 illustrates removal of the residue from the solder recovery device 100 of Figure 1 following solder recovery, in accordance with an embodiment of the present disclosure.
  • the residue that remains inside the solder pot 108 is removed into a separate dross container 502.
  • the solder recovery device 100 is tilted using a tilting mechanism (shown in Fig. 6), which can be a motor, separate from the motor 1 12, coupled to an appropriate transmission mechanism.
  • the motor for tilting the solder recovery device 100 is coupled to the solder recovery device 100 via a chain and sprocket arrangement (shown in Fig. 6).
  • the motor for tilting through the chain and sprocket arrangement, makes the solder recovery device 100 tilt at a predetermined angle, so as to let the residue removed from the solder recovery device 100, for example, through the same input section 102 (i.e., via the hopper) from which the dross to be processed was initially poured into the solder recovery device 100.
  • the impeller 1 16 is also rotated simultaneously using the motor 1 12, so as to remove almost the entire residue deposited inside the solder pot 108 following recovery of the solder.
  • the pivotal mounting of the chamber is advantageous, as it permits easy emptying of the unwanted products of the process, typically a powder of oxides of metal. It also minimizes the surface area or "footprint" of the device, meaning it occupies a smaller space than alternative apparatus.
  • FIGS 6 to 10 show actual representation of the solder recovery device 100 as well as various parts/components of the solder recovery device 100 discussed hereinbefore, in accordance with an embodiment.
  • Figure 6 illustrates an actual representation of the solder recovery device 100 shown from a side where a tilting mechanism 602 is provided.
  • the tilting mechanism is, in the present embodiment, is a chain and sprocket arrangement 602 coupled to a motor 604.
  • FIG. 7 illustrates an actual representation of an impeller 1 16 of the solder recovery device 100, in accordance with an embodiment of the present disclosure.
  • the impeller 1 16 is coupled to the rotor shaft 1 14 such that an axis of the impeller 1 16 is in line with an axis of the rotor shaft 1 14.
  • the impeller includes a plurality of blades disposed radially about a central shaft.
  • the blades are slanted or tapered to provide a screw action.
  • each blade comprises one or more slots to enhance the agitating effect when rotated.
  • Figure 8 illustrates an actual representation of the coupling of the motor 1 12 with the rotor shaft 1 14 of the solder recovery device 100, in accordance with an embodiment of the present disclosure.
  • the rotor shaft 1 14 is shown to be coupled to the motor 1 12 via a belt and pulley mechanism 802.
  • Figure 9 illustrates an actual representation of the output section 106 of the solder recovery device 100 of Figure 1 , in accordance with an embodiment of the present disclosure.
  • the output section 106 is shown enclosed in a heat protective covering so as to avoid unwanted heat losses.
  • FIG 10 illustrates various representations of the filter device 402 of the solder recovery device 100 of Figure 1 , in accordance with an embodiment of the present disclosure.
  • the filter device 402 is in the form of a cylindrical enclosure. Further, the drain valve 1 18 attached to one end of the filter device 402 as shown.
  • the handle 404 is connected to the filter device 402 via a coupler 1002.
  • Figure 10b shows a top perspective view of the filter device 402.
  • a removable perforated disc 1004 is placed inside the filter device 402 for allowing dross to flow out slowly.
  • Figure 10c shows a perspective view of the filter device 402 illustrating the removable perforated disc 1002 and a steel wool 1006. The steel wool is placed below the perforated disc 1004 and taps impurities in the solder draining out of the drain valve 1 18.
  • Figure 1 1 is a perspective view of a solder recovery device according to one embodiment of the invention. Ducting for extraction of hazardous fumes is shown at the top of the unit.
  • Figure 12 is a perspective view of the inlet, or input section, showing dross being introduced into the device.
  • Figure 13 shows recovered solder flowing from the outlet, and into the drain tray.
  • Figure 14 shows an alternative embodiment of the filter device, which includes a slotted cover.
  • Figure 15 shows the filter device with the cover removed, showing the filtration medium (in this case wire wool) inside.
  • Figure 16 shows ingots of recovered solder, together with the by-product of the process, in the form of metal oxides.
  • solder pot 108 is placed inside the enclosure 1 10, the whole process of solder recovery is also safe for handlers.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un appareil et un procédé permettant de récupérer de la bonne brasure en provenance des crasses à des fins de réutilisation. Les crasses sont introduites dans une chambre (108) qui est chauffée, une agitation étant mise en oeuvre au moyen d'une roue (116) par exemple. La brasure récupérée est purgée au moyen d'un robinet de purge (118) qui est activé de manière dûment thermique. Les déchets peuvent être collectés par inversion de la cuve par le biais d'un pivot motorisé.
PCT/EP2014/052065 2013-02-05 2014-02-03 Appareil et procédé de récupération de brasure Ceased WO2014122100A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
RU2015137297A RU2015137297A (ru) 2013-02-05 2014-02-03 Устройство для регенерации припоя и соответствующий способ
EP14702832.8A EP2953758B1 (fr) 2013-02-05 2014-02-03 Appareil et procédé pour recuperation de materiau de soudure
BR112015018627A BR112015018627A2 (pt) 2013-02-05 2014-02-03 aparelho e método para recuperação de solda
JP2015555741A JP2016514199A (ja) 2013-02-05 2014-02-03 はんだ回収装置及び方法
MX2015010147A MX381580B (es) 2013-02-05 2014-02-03 Aparato y método para la recuperación de soldadura.
US14/765,764 US9976198B2 (en) 2013-02-05 2014-02-03 Apparatus and method for solder recovery
ES14702832T ES2808549T3 (es) 2013-02-05 2014-02-03 Aparato y método de recuperación de material de soldadura
CN201480007614.0A CN104968464B (zh) 2013-02-05 2014-02-03 焊料回收装置和方法
IL240088A IL240088A0 (en) 2013-02-05 2015-07-22 Device and method for recovering bread

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN328/MUM/2013 2013-02-05
INMU03282013 2013-02-05

Publications (1)

Publication Number Publication Date
WO2014122100A1 true WO2014122100A1 (fr) 2014-08-14

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ID=50064600

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/052065 Ceased WO2014122100A1 (fr) 2013-02-05 2014-02-03 Appareil et procédé de récupération de brasure

Country Status (1)

Country Link
WO (1) WO2014122100A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025823A1 (fr) 1994-03-18 1995-09-28 The Apple House (Electronics) Ltd. Recuperation de materiau de soudure
US20020027157A1 (en) * 2000-09-07 2002-03-07 Hiroshi Takano Solder dross removal apparatus and method
US6464929B1 (en) * 2000-09-01 2002-10-15 Q. C. Designs, Inc. Dross processing system
US20030136816A1 (en) * 2002-01-18 2003-07-24 Mcdonald David M. Solder-dross mixture separation method and apparatus
US20100187732A1 (en) 2009-01-23 2010-07-29 Ricoh Company, Ltd. Solder recovery device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025823A1 (fr) 1994-03-18 1995-09-28 The Apple House (Electronics) Ltd. Recuperation de materiau de soudure
US6464929B1 (en) * 2000-09-01 2002-10-15 Q. C. Designs, Inc. Dross processing system
US20020027157A1 (en) * 2000-09-07 2002-03-07 Hiroshi Takano Solder dross removal apparatus and method
US20030136816A1 (en) * 2002-01-18 2003-07-24 Mcdonald David M. Solder-dross mixture separation method and apparatus
US20100187732A1 (en) 2009-01-23 2010-07-29 Ricoh Company, Ltd. Solder recovery device

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