JP2011121101A - Reflow furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflow furnace in which, in order to prevent a gasified flux from depositing and solidifying on a motor rotary shaft for rotating fans disposed in a preheating zone, a main heating zone, and a cooling zone, the gasified flux is collected in a flowable liquid state before the solidification in an efficient and reliable manner. <P>SOLUTION: A drain part 20 constituting a flux collection device 10A is provided on a side opposite to a fan of a motor base 16 and in a peripheral part of a rotary shaft 14. The face opposite to a fan of a drain part 20 constitutes an inclined face 20a that is inclined from a plane position of the motor base 16 toward a discharge port 46 provided on the backside of the motor base 16. The flux collected in a center part of the motor base 16 by the rotary drive of the fan flows into a drain part 20 provided in a center part of the motor base 16, flows along the inclined face 20a, is passed from the drain part 20 through the discharge port 46, a drain pipe, and a pipe 48 and is received in a collection container 34. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention prevents a part of the vaporized flux generated by the reflow process from adhering to a motor rotating shaft for rotating a fan disposed in the preheating zone, the main heating zone, and the cooling zone and solidifying. The present invention relates to a reflow furnace equipped with a flux recovery device for the purpose.

  When soldering a printed circuit board and an electronic component, a reflow furnace is generally used. The reflow furnace includes a transport conveyor for transporting the substrate and a tunnel-shaped reflow main body (muffle) to which the substrate is supplied by the transport conveyor. Inside the reflow body, a preheating zone, a main heating zone, and a cooling zone are provided along a conveyance path from the carry-in port to the carry-out port. In each of the preheating zone and the main heating zone, a set of hot air blowing heaters and fans are installed. Hot air blowing heaters and fans are installed above and below the conveyor, respectively, and the hot air is blown from the top and bottom to the substrate conveyed by the conveyor to melt the solder contained in the solder paste. An electronic component or the like is fixed to the electrode of the substrate. In the cooling zone, a fan for blowing cooling air to cool the printed circuit board heated in the preheating zone and the main heating zone, and a motor for rotating the fan are installed.

  Here, the solder paste contains powder solder, solvent, and flux. Of these, the flux contains rosin as a component, removes the oxide film on the surface of the metal to be soldered, prevents reoxidation by heating during soldering, and reduces the surface tension of the solder. Has the effect of improving wettability.

  On the other hand, the flux is vaporized and filled in the reflow body by heating with the heater. The vaporized flux filled in the reflow body is generally cleaned through a removing device for removing a flux component provided outside the muffle, and then returned to the muffle through the circulation path. However, as the fans arranged in the preheating zone, the main heating zone, and the cooling zone rotate, a flow that flows around to the back side of the fan is generated. Therefore, a part of the flux evaporated by this flow goes around to the back side of the fan. . The vaporized flux that circulates to the back side of the fan is cooled and becomes a fluid flux. After the vaporized flux becomes a liquid flux, when the rotation of the motor stops and the internal temperature decreases, the viscosity of the liquefied flux increases and the fluidity decreases, and the flux is solidified and deposited on the base portion. At this time, if the flux is solidified by the fan rotation shaft, there arises a problem that the rotation of the fan is hindered.

  In order to prevent such accumulation of flux, etc., an inclined portion that is inclined from the axial center of the fan toward the outer periphery and a gas at a temperature that makes it possible to liquefy the flux are introduced into the bottom of the casing of the reflow furnace. A reflow furnace having a gas inlet for the purpose has been proposed (see Patent Document 1). Flux recovery ports are provided at two locations on the periphery of the bottom surface of the casing of the reflow furnace, and flux components are deposited by causing the flux on the bottom surface to flow along the inclined surface and flow into the flux recovery port. Is preventing.

JP 2008-272793 A

  However, the reflow furnace disclosed in Patent Document 1 has the following problems. That is, the flux that has liquefied around the back side of the fan flows against the inclination direction of the inclined surface due to the wind toward the fan center generated when the fan rotates, and collects on the rotation axis (center part) of the fan. There was a tendency to end up. At this time, if the flux enters the seal portion of the rotating shaft, the flux is fixed due to a decrease in temperature due to the stop of the fan, and when the next fan is operated, the motor shaft is solidified by the fixation of the flux and the motor is overloaded. There was a problem that the motor did not rotate normally. In this case, since the reflow furnace cannot be moved, there arises a problem that an operation for removing the flux fixed to the motor is required.

  Therefore, the present invention solves the above-mentioned problems, and its purpose is to attach vaporized flux to a motor rotating shaft for rotating a fan disposed in a preheating zone, a main heating zone, and a cooling zone. To provide a reflow furnace equipped with a flux recovery device capable of recovering efficiently and reliably in a liquefied state having fluidity before the vaporized flux is solidified in order to prevent solidification It is in.

  In order to solve the above-described problem, a reflow furnace according to the present invention includes a reflow main body having a motor, a fan connected to the motor via a rotating shaft, and a case member that houses the fan, and a reflow of the reflow main body. A reflow furnace equipped with a flux recovery device for recovering flux generated by processing, wherein the flux recovery device is on the opposite side of the base member attached to the case member and the fan of the base member and of the rotating shaft. It is provided in a peripheral part, and is provided with a drain part that allows the flux generated by the reflow process to flow in and discharge to the outside.

  As the fan is driven to rotate, wind (pressure) flowing in the direction of the rotation axis is generated between the fan and the base member. Therefore, the flux that flows into the back side of the fan gathers on the rotating shaft by the wind flowing in the center direction. In the present invention, since the drain portion is provided on the side of the base member facing the fan and in the periphery of the rotating shaft, the flux collected on the rotating shaft by the rotational drive of the fan flows into the drain portion, and the drain It is discharged from the outside. In the present invention, the flux includes a vaporized state flux, a fluid liquid flux, and a solidified flux.

  According to the present invention, since the drain portion is provided in the peripheral portion of the rotating shaft, the flux that inevitably collects on the rotating shaft can be efficiently and surely flowed into the drain portion, It is possible to prevent the flux from sticking to the shaft. As a result, it is possible to reduce the work time for removing the drive unit, the fan, and the base member due to flux fixation, the cleaning work, and the like, so that the production efficiency can be greatly improved.

It is a figure which shows the structural example of the reflow furnace which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the structural example of a flux collection | recovery apparatus. It is a top view which shows the structural example of a flux collection | recovery apparatus. It is a side view which shows the structural example of a flux collection | recovery apparatus. It is sectional drawing which shows the structural example of a flux collection | recovery apparatus. It is an expanded sectional view which shows the structural example of the principal part of a flux collection | recovery apparatus. It is a figure which shows the other structural example of a sealing member. It is a perspective view which shows the structural example of the principal part of a flux collection | recovery apparatus. It is a perspective view which shows the structural example at the time of attachment or detachment of a flux collection | recovery apparatus. It is a figure for demonstrating nitrogen purge. It is a figure which shows the operation example of the maintenance at the time of normal. It is a figure which shows the operation example of the maintenance at the time of abnormality. It is a figure which shows the structural example of the flux collection | recovery apparatus which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating the heater for flux heating. It is a figure which shows the structural example of the flux collection | recovery apparatus which concerns on the 3rd Embodiment of this invention. It is a top view which shows the structural example of a flux collection | recovery apparatus. It is a figure which shows the operation example of the maintenance at the time of normal time and abnormality.

Hereinafter, the best mode for carrying out the invention (hereinafter referred to as an embodiment) will be described.
<1. First Embodiment>
[Configuration example of reflow furnace]
As shown in FIG. 1, the reflow furnace 100 includes a reflow main body (muffle) 40, a transfer conveyor 80, a heater 50, a fan 60, a motor 12, and a flux recovery device 10 </ b> A. The reflow main body 40 is a casing extending in a tunnel shape having a carry-in port 40a and a carry-out port 40b. Zone Z3. The conveyance conveyor 80 extends along a conveyance path from the carry-in port 40a to the carry-out port 40b, and conveys the printed circuit board 70 from the carry-in port 40a of the reflow body 40 toward the carry-out port 40b at a predetermined speed ( Arrow X direction).

  The heater 50, the fan 60, and the motor 12 are installed in each of the preheating zone Z <b> 1 and the main heating zone Z <b> 2, and are arranged to face each other in the vertical direction of the transport conveyor 80. In the case of this example, the preheating zone Z1 is composed of a unit composed of a pair of upper and lower heaters 50, a fan 60 and a motor 12, and similarly, the main heating zone Z2 is composed of a pair of upper and lower heaters 50 and a fan. The unit composed of 60 and the motor 12 has a two-unit configuration. The heater 50 and the fan 60 constituting one unit of the preheating zone Z1 and the main heating zone Z2 are accommodated in a box-shaped case member 40a.

  The heater 50 installed in the preheating zone Z1 and the main heating zone Z2 heats the gas inside the reflow main body 40 to generate hot hot air. The fan 60 is composed of, for example, a sirocco fan, and blows hot air heated by the heater 50 by rotation of the motor 12 from above and below the printed circuit board 70. As a result, the solder of the printed circuit board 70 is melted, and electronic components and the like are fixed to the electrodes of the printed circuit board 70. In addition, the heater 50, the fan 60, and the motor 12 which are installed in the preheating zone Z1 and the main heating zone Z2 have the same configuration.

  In the cooling zone Z3, a fan and a motor (not shown) for blowing out cooling air for cooling the printed circuit boards heated in the preheating zone Z1 and the main heating zone Z2 are installed. In the case of this example, the configuration of the cooling zone Z3 is a configuration in which the heater 50 is removed from the unit configurations of the preheating zone Z1 and the main heating zone Z2, and the refrigerator and the motor constitute the refrigerator 92.

  The flux recovery apparatus 10A is an apparatus for efficiently recovering the vaporized flux generated by the reflow process to the printed circuit board 70 by the heater 50 and the fan 60 in a fluid liquid flux state. , Provided for each fan 60 and motor 12. The flux recovery apparatus 10A may be configured differently for each of the preheating zone Z1, the main heating zone Z2, and the cooling zone Z3 according to the components of the flux generated in each preheating zone Z1 and the main heating zone Z2. However, it can be configured differently for each unit constituting each zone. The flux recovery apparatus 10A will be described later.

[Operation example of reflow furnace]
Next, an example of the operation of the reflow furnace 100 will be described. As shown in FIG. 1, a printed circuit board 70 on which surface-mounting electronic components are mounted is placed on a transport conveyor 80 and is carried into the reflow furnace 100 through a carry-in entrance 40 a. In the preheating zone Z <b> 1 in the reflow furnace 100, hot air is blown onto the printed circuit board 70 by driving the heater 50, the fan 60, and the motor 12 installed above and below the transport conveyor 80. Thereby, the flux is activated and the oxide film on the surface of the electrode and the solder paste is removed.

  At this time, the vaporized flux generated by the reflow process is filled in the reflow main body 40 and is generally purified by a removal device that removes a flux component provided outside the furnace, although not shown in the figure. Is returned to the furnace again. However, with the rotation of the fan 60 arranged in the preheating zone Z1, the main heating zone Z2, and the cooling zone Z3, a flow that flows around the back side of the fan 60 is generated, so that part of the flux vaporized by this flow is It goes around the back side of the fan 60. In the case of this example, since the flux recovery device 10A is installed for each motor 12 and fan 60, a part of the vaporized flux that has circulated to the back side of the fan 60 installed in the preheating zone Z1 is a flux recovery device. Recovered by 10A.

  Subsequently, when the printed circuit board 70 is conveyed to the main heating zone Z2, the solder is melted and the electronic component is fixed to the electrode of the printed circuit board 70. The flux generated at this time is also collected by the flux collecting apparatus 10A as described above. Finally, when the printed circuit board 70 is transported to the cooling zone Z3, the printed circuit board 70 is rapidly cooled to form a solder composition. Then, the printed circuit board 70 cooled in the cooling zone Z3 is carried out from the carry-out port 40b. The vaporized flux generated by blowing hot air is also collected by the flux collecting apparatus 10A provided for each refrigerator 92 in the cooling zone Z3 as described above.

[Configuration example of flux recovery unit]
Next, an example of the configuration of the flux recovery apparatus 10A will be described. As shown in FIGS. 2 to 5, the flux recovery apparatus 10 </ b> A according to the present invention includes a motor base 16 that is an example of a base member, a high neck collar portion 18, a drain portion 20, a drain pipe 38, and a recovery container 34. ing. Since the flux of liquid deposited on the motor base 16 flows downward due to its own weight, the flux recovery apparatus 10 according to the present invention is basically only on the lower side of the conveyor 80 of the reflow furnace 100 shown in FIG. It shall be installed.

  The motor base 16 is a disk-shaped member made of a metal material excellent in corrosion resistance and heat resistance, such as stainless steel (SUS) or aluminum, and having a slightly larger outer diameter than the fan 60, and accommodates the fan 60 and the like. The case member 40a (see FIG. 1) is attached to the bottom surface portion via a fastening member such as a screw. The motor base 16 is inclined on the side facing the fan 60 so that the height of the planar portion decreases from the wall portion 16b toward the rotation shaft 14 from the wall portion 16b along the peripheral edge of the motor base 16. And the inclined surface 16a. Since the drain part 20 is formed in the peripheral part of the rotating shaft 14 as will be described later, the flux accumulated on the motor base 16 is effectively caused to flow to the drain part 20 formed on the motor base 16 by the inclined surface 16a. Can do.

  The motor 12 is attached to the back side (the side opposite to the fan 60) of the motor base 16 via a central drain block 22. The motor 12 is connected to, for example, a commercial power supply unit 200 and rotates the fan 60 via the rotary shaft 14 based on an instruction from a control device (not shown). One end of the rotating shaft 14 is rotatably attached to the motor 12, and a portion extending from the motor base 16 at the other end to the fan 60 side is attached to the fan 60.

  As shown in FIG. 6, between the outer peripheral surface 14 a of the rotating shaft 14 and the inner peripheral surface 22 a of the central drain block 22, flux fumes and the like enter the gap S <b> 1 between the rotating shaft 14 and the central drain block 22. A sealing member 32 is inserted for prevention. As the seal member 32, for example, a contact-type seal member such as an oil seal, V-packing, or Teflon (registered trademark) seal, a non-contact-type seal member (for example, a labyrinth seal), or the like is used. In this example, an example using a V packing and a Teflon (registered trademark) seal is shown.

  Here, a case where another seal member 32 is used will be described. As shown in FIG. 7A, when a non-contact type seal is used as the seal member 32, since it is a non-contact type, there is an effect that grease is unnecessary and cost can be reduced. Subsequently, when the contact type V packing is used as shown in FIG. 7B and when the contact type oil seal is used as shown in FIG. It has the effect that the inflow to S1 can be effectively prevented. In addition, as shown in FIG. 7D, when a contact type Teflon (registered trademark) seal is used, it is possible to effectively prevent the inflow of flux and to eliminate the need for grease.

  As shown in FIG. 6, the high neck collar portion 18 is provided above the seal member 32 and along the circumferential direction of the rotary shaft 14, and the flux to the gap S <b> 1 between the rotary shaft 14 and the central drain block 22. It prevents the intrusion of etc. The high neck collar portion 18 is configured by integrally forming a base portion 18a, a cylindrical portion 18b, and a folded portion 18c. The base portion 18a is formed of an annular body having an inner diameter substantially the same as the inner diameter of the rotary shaft 14, and is attached to the upper surface portion of the motor base 16 via a fastening member such as a screw. The cylindrical portion 18 b is erected upward from the inner peripheral edge portion of the base portion 18 a and is formed along the circumferential direction of the rotating shaft 14. The folded portion 18c is folded outward from the upper end edge of the cylindrical portion 18b and extends outward by a predetermined length. With such a configuration, it is possible to reliably prevent mainly the flux fume from entering the gap S1 of the rotating shaft 14.

  The drain part 20 is configured by a groove (valley part) for discharging flux and the like accumulated on the motor base 16 from the motor base 16 to the outside, and is formed in the peripheral part of the rotary shaft 14 located at the center of the motor base 16. ing. That is, in this example, the drain portion 20 is formed at the center portion of the motor base 16 and along the circumferential direction of the rotating shaft 14. The reason why the drain portion 20 is formed in the central portion of the motor base 16 is that the flux gathers at the central portion (rotating shaft 14) of the motor base 16 due to the wind toward the center generated when the fan 60 rotates. is there. As shown in FIGS. 2, 5, and 8, the drain portion 20 is an inclined surface that is inclined from the planar position of the motor base 16 toward the drain pipe 38 (discharge port 46) provided on the back side of the motor base 16. 20a. The upstream side C of the inclined surface 20a has a mountain shape that is curved so that its central portion is high and lower toward the wall surface portions 20b on both sides (see FIG. 8). As shown in FIG. 8, a discharge port 46 for discharging the flux that has flowed into the drain portion 20 to the outside is formed in the wall surface portion 20 b positioned on the downstream side of the inclined surface 20 a of the drain portion 20. A drain pipe 38 extending obliquely outward and downward is connected to the discharge port 46. The drain pipe 38 constitutes an example of a first discharge pipe.

  A pipe pipe 48 is connected to the drain pipe 38. The pipe tube 48 has an outer diameter selected to be substantially the same as the inner diameter of the drain tube 38, and is configured to be inserted / removed inside the drain tube 38. Thereby, the discharge part of the drain part 20 has a double structure of the drain pipe 38 and the pipe pipe 48. The pipe pipe 48 constitutes an example of a second discharge pipe. The length in the longitudinal direction of the pipe tube 48 is selected to be greater than the length in the longitudinal direction of the drain tube 38 (see FIG. 12), and when the pipe tube 48 is inserted inside the drain tube 38, the tip of the pipe tube 48 is It extends to the vicinity of the discharge port 46. Thereby, even when the flux is clogged in the vicinity of the discharge port 46, the clogged flux is accumulated inside the pipe pipe 48 instead of the drain pipe 38. It becomes possible to avoid flux clogging. As shown in FIG. 9, a thread groove 48 a is formed on the outer peripheral portion of the pipe tube 48, and the drain tube 38 is screwed into the thread groove (not shown) formed inside the drain tube 38. It can be attached to.

  A container lid 42 that functions as a lid of a collection container 34 to be described later is attached to the outer end of the pipe tube 48. The container lid 42 includes a top surface part 42a having substantially the same diameter as the outer diameter of the collection container 34, and a side wall part 42b erected on the outer peripheral edge of the top surface part 42a. A thread groove 42c corresponding to the thread groove 34a of the collection container 34 is formed on the inner peripheral surface of the side wall portion 42b.

  The collection container 34 is connected to the drain pipe 38 via the pipe pipe 48 and accommodates the flux that has flowed through the drain portion 20, the discharge port 46, the drain pipe 38, and the pipe pipe 48. As shown in FIG. 9, a thread groove 34 a is formed in the upper peripheral edge of the collection container 34. By fitting the thread groove 34a of the collection container 34 into the thread groove 42c formed in the container lid 42, the collection container 34 can be detachably attached to the pipe pipe 48. The collection container 34 is selected to have a size that can be easily removed by an operator and can accommodate a certain amount of flux. Further, the collection container 34 may be made of a transparent material so that the amount of flux collected in the collection container 34 can be easily confirmed.

  As shown in FIG. 10, the central drain block 22 is provided with a nitrogen space S <b> 2 for injecting nitrogen gas into a gap S <b> 1 between the outer peripheral surface 14 a of the rotating shaft 14 and the inner peripheral surface 22 a of the central drain block 22. ing. The nitrogen space portion S2 is a space for injecting nitrogen gas into the gap S1 to set the pressure P2 in the gap S1 to be higher than the pressure P1 on the reflow body 40 side, and the inner inlet communicates with the gap S1. The outer injection port communicates with the outside. A half union 30 is attached to the inlet of the nitrogen space S, and a nitrogen generation unit 300 for generating nitrogen gas is connected to the half union 30. Further, the central drain block 22 is provided with a grease injection portion (not shown) for injecting the grease of the seal member 32 separately from the nitrogen space portion S2.

  In this example, when the reflow furnace 100 is turned on, nitrogen gas is introduced into the reflow main body 40 from a nitrogen inlet (not shown), and the pressure P1 in the furnace is set to 500 Pa. When the reflow furnace 100 is turned on, nitrogen gas is injected into the nitrogen space S2 from the nitrogen generator 300 through the half union 30, and the pressure P2 in the gap S1 is adjusted to 0.3 MPa or less, for example. As a result, the pressure P2 in the gap S1 between the outer peripheral surface 14a of the rotating shaft 14 and the inner peripheral surface 22a of the central drain block 22 becomes higher than the pressure P1 in the reflow body 40, and nitrogen gas is supplied from the gap S1 to the reflow body 40. Therefore, it is possible to reliably prevent the flux from entering the gap S1.

[Operation example during normal maintenance]
As shown in FIG. 11, when the reflow furnace 100 is turned on and the fan 60 is driven, wind from the outside toward the center is generated on the back side of the fan 60. Due to the wind toward the center, the vaporized flux that has flowed to the rear side of the fan 60 is cooled by the motor base 16, and the fluid flux of the fluid has the center of the motor base 16 along the inclined surface 16 a of the motor base 16. Are gathered on the rotating shaft 14 provided in the. The fluid liquid flux collected at the center of the motor base 16 flows directly into the drain portion 20 formed in the peripheral portion of the rotating shaft 14.

  The flux that has flowed into the drain part 20 is accommodated in the recovery container 34 via the discharge port 46, the drain pipe 38, and the pipe pipe 48 of the drain part 20. When the operator checks whether or not a certain amount of flux has accumulated in the collection container 34 at a predetermined timing, and determines that a certain amount of flux has accumulated in the collection container 34, as shown in FIG. After the recovery container 34 is removed from the container lid 42 of the pipe 48, the flux that is the contents of the recovery container 34 is recovered. When the contents of the collection container 34 are emptied, the collection container 34 is attached to the container lid 42 and set again.

[Operation example when an error occurs]
As shown in FIG. 12, after the reflow furnace 100 is stopped, when the flux of fluid liquid is solidified in the middle of the discharge path due to a decrease in the temperature of the flux, the operator can remove the drain pipe 38. Pull out the pipe 48 from the pipe. Since the solidified flux clogged in the middle of the discharge path is accumulated not on the drain pipe 38 but on the drawn pipe pipe 48 side, it can be avoided that the solidified flux remains in the drain pipe 38. The operator cleans the inside of the removed pipe 48 to remove the solidified flux, and attaches the pipe to the drain pipe 38 and sets it again.

  As described above, according to the first embodiment, since the drain portion 20 is provided in the periphery of the rotating shaft 14 in the motor base 16, the rotating shaft 14 is inevitably required when the fan 60 rotates. Thus, the liquefied flux having fluidity before the vaporized flux gathered in the solidified can be efficiently and reliably flowed into the drain portion 20 and discharged to the outside. Thereby, permeation of the flux into the rotating shaft 14 can be avoided, and sticking of the flux on the rotating shaft 14 can be prevented. As a result, it is possible to reduce the work time for removing the motor 12, the fan 60, and the motor base 16 due to flux fixation, the cleaning work, and the like, so that the productivity can be greatly improved.

  In the first embodiment, the drain portion 20 is provided at one location of the motor base 16 and the drain pipe 38 connected to the drain portion 20 is drawn obliquely outward and downward. Therefore, by pulling out the drain pipe 38 on one side surface of the reflow furnace 100 that can be opened and closed, the removal operation and the cleaning operation of the collection container 34 can be easily and efficiently performed. Thereby, an operator's work burden can be reduced significantly.

  Further, since the drain structure is a double structure of the drain pipe 38 and the pipe pipe 48, even when the flux is stagnated (clogged) in the middle of the discharge path, the inner pipe pipe 48 is removed from the drain pipe 38. The inside of the pipe tube 48 can be easily cleaned outside the reflow furnace 100. Further, since the flux does not remain in the drain pipe 38, the clogging of the flux can be reliably prevented.

  Further, by providing the high neck collar portion 18 having a folded structure along the circumferential direction of the rotating shaft 14, it is possible to effectively prevent flux and flux fume from entering the gap S <b> 1 between the seal member 32 and the rotating shaft 14. can do. Furthermore, according to the present embodiment, the pressure in the gap S1 between the rotating shaft 14 and the central drain block 22 is set to be higher than the pressure in the reflow body 40, so that flux and flux fume enter the gap S1. Can be reliably prevented.

<2. Second Embodiment>
The flux recovery apparatus 10B according to the second embodiment is different from the flux recovery apparatus 10A described in the first embodiment in that it includes a heater for heating the flux. In addition, since the structure of the other flux collection | recovery apparatus 10B is the same as the flux collection | recovery apparatus 10A demonstrated in 1st Embodiment mentioned above, the same code | symbol is attached | subjected to a common component and detailed description is abbreviate | omitted. To do.

[Configuration example of flux recovery unit]
As shown in FIGS. 13 and 14, a heater mounting portion 39 for mounting a flux heating heater 90 is provided on the drain 46 side of the drain pipe 38 constituting the flux collecting apparatus 10 </ b> B. The heater mounting portion 39 is a portion whose diameter is larger than the outer diameter of the drain pipe 38, and is a heater insertion hole 39a for inserting the flux heating heater 90 into each of the lower corners of the rectangular outer surface. , 39a are formed.

  The flux heating heater 90 is a rod-shaped so-called card ridge heater, is mounted in the heater insertion hole 39a, and heats the drain pipe 38 and the pipe pipe 48 from the lower side of the drain pipe 38. In this example, two flux heating heaters 90 are used, but one flux heating heater 90 may be used, or three or more flux heating heaters 90 may be used. Further, the attachment position of the heater 90 for flux heating is not limited to the lower corner of the heater attachment portion 38b, and may be the upper portion of the heater attachment portion 38b or the left and right. A wiring is connected to the outer end of the flux heating heater 90, and the power supply unit 200 is connected to the other end of the wiring. For the power source unit 200, for example, a commercial power source of 200V is used.

  A control unit (not shown) heats the drain pipe 38 and the pipe pipe 48 by turning on the flux heating heater 90 simultaneously with turning on the power of the reflow furnace 100, for example. By heating the drain pipe 38 and the pipe pipe 48, the flux inside the drain pipe 38 and the pipe pipe 48 is heated, so that the flux does not stagnate and accumulate in the course of reaching the recovery container 34. The temperature control by the flux heating heater 90 may be intermittent control that stops after heating for a certain period of time, or the temperature of the drain pipe 38 or the like is measured by a temperature sensor, and the flux is determined based on the measured temperature result. The heater 90 may be turned on / off. Further, the temperature of the flux heating heater 90 may be varied depending on the type of flux to be used. Furthermore, since the components of the generated flux are different between the preheating zone Z1 and the main heating zone Z2, the temperature may be controlled to be different in each zone.

  As described above, according to the second embodiment, since the flux heating heater 90 is installed in the drain pipe 38 where the temperature drop is significant after the heater 50 and the fan 60 are stopped, the drain section 20 and the drain pipe are arranged. A temperature drop near 38 can be reliably prevented. Thereby, the stagnation (clogging) due to the decrease in the clay of the flux can be effectively prevented, and the flux can be smoothly and reliably flowed and accommodated in the collection container 34. As a result, it is possible to reduce the work time for removing and cleaning each component such as the motor 12 due to the fixation of the flux, and the production efficiency can be greatly improved.

<3. Third Embodiment>
The flux recovery apparatus 10C according to the third embodiment differs from the first embodiment in which the drain portion 20 is provided at the central portion of the motor base in that the drain portion 20 is provided at the peripheral portion of the motor base. Yes. In addition, since the structure of other flux collection | recovery apparatuses 10C is the same as the flux collection | recovery apparatus 10A demonstrated in 1st Embodiment mentioned above, the same code | symbol is attached | subjected to a common component and detailed description is abbreviate | omitted. To do.

  As shown in FIGS. 15 and 16, the drain portion 20 constituting the flux collecting apparatus 10 </ b> C penetrates the motor base 16 obliquely outward and downward from the peripheral edge of the upper surface of the motor base 16 (the surface facing the fan 60). Is formed. In this example, the drain part 20 is provided in two places, and these drain parts 20 and 20 are arrange | positioned in the position which the peripheral part of the motor base 16 opposed. The upper surface of the motor base 16 is an inclined surface 16 c that is inclined from the central portion of the motor base 16 toward the drain portion 20 in the outward direction. As a result, the liquefied flux flows outward along the inclined surface 16c, flows into the drain portion 20, and is discharged to the recovery container 34 described later.

  As shown in FIG. 17, a pipe pipe 48 is connected to the drain portion 20. The outer diameter of the pipe tube 48 is selected to be substantially the same as the inner diameter of the drain portion 20, and the pipe tube 48 is configured to be inserted / removed inside the drain portion 20. The length in the longitudinal direction of the pipe tube 48 is selected to be longer than the length in the longitudinal direction of the drain portion 20, and when the pipe tube 48 is inserted inside the drain portion 20, the distal end portion of the pipe tube 48 is the drain portion 20. It extends to a position near the inflow port 20c. A thread groove is formed on the outer periphery of the tip of the pipe tube 48, and the pipe tube 48 can be screwed into a thread groove formed on the inner side of the drain portion 20 to be fixed and attached to the drain portion 20. Yes. The other end of the pipe 48 is provided with a container lid 42 that functions as a lid for a collection container 34 to be described later. A thread groove corresponding to the thread groove of the collection container 34 is formed on the inner peripheral surface of the container lid 42.

  The collection container 34 is connected to the drain part 20 via the pipe pipe 48 and accommodates the flux that has flowed through the drain part 20 and the pipe pipe 48. A thread groove is formed on the periphery of the upper end of the collection container 34, and the collection container 34 is detachably attached to the pipe pipe 48 by fitting the collection container 34 into the thread groove formed in the container lid 42. It is possible. The collection container 34 is selected to have a size that can be easily removed by an operator and can accommodate a certain amount of flux. Further, the collection container 34 may be made of a transparent material so that the amount of flux collected in the collection container 34 can be easily confirmed.

  As described above, according to the third embodiment, the same operational effects as those of the first embodiment can be obtained. That is, since the drain structure is a double structure of the drain part 20 and the pipe pipe 48, even if the flux is stagnated (clogged) in the middle of the discharge path, the inner pipe pipe 48 is removed from the drain part 20. The inside of the pipe tube 48 can be easily cleaned outside the reflow furnace 100. In addition, since flux does not remain in the drain portion 20, it is possible to reliably prevent clogging of the flux and the like.

10A, 10B, 10C ... Flux recovery device, 12 ... Motor, 14 ... Rotating shaft, 16 ... Motor base (base member), 16a ... Inclined surface, 18 ... High neck collar , 20 ... Drain part, 34 ... Recovery container, 38 ... Drain pipe (first discharge pipe), 40 ... Reflow body, 48 ... Pipe pipe (second discharge pipe) , 50 ... heater, 60 ... fan, 70 ... printed circuit board, 80 ... conveyor, 90 ... heater for flux heating, 100 ... reflow furnace

Claims (7)

A reflow comprising a reflow main body having a motor, a fan connected to the motor via a rotating shaft, and a case member for housing the fan, and a flux recovery device for recovering a flux generated by a reflow process of the reflow main body A furnace,
The flux recovery device is
A base member attached to the case member;
A drain portion that is provided on the opposite side of the base member to the fan and in the periphery of the rotating shaft, and that allows the flux generated by the reflow process to flow in and to be discharged to the outside. Reflow furnace. The drain part is provided with a discharge port for discharging the flux that has flowed into the drain part to the outside.
The reflow furnace according to claim 1, wherein the drain portion has an inclined surface inclined toward the discharge port from a flat portion of the base member. The facing surface of the base member facing the fan is
3. The reflow furnace according to claim 1, wherein the reflow furnace includes an inclined surface that is inclined so that a height of the facing surface decreases from a peripheral edge portion of the base member toward the drain portion. The high neck collar part which has the folding structure for preventing the penetration | invasion of the said flux to the clearance gap between the said base member and the said rotating shaft is further provided. The Claim 1 thru | or 3 characterized by the above-mentioned. The reflow furnace described. A first discharge pipe connected to the discharge port of the drain part;
A second discharge pipe removably attached to the inside of the first discharge pipe;
A recovery container attached to an end portion of the second discharge pipe opposite to the discharge port and for collecting the flux discharged from the drain portion. The reflow furnace as described in any one of Claims 4-5. The flux is vaporized by the reflow process, and is liquefied by cooling between the fan and the base member as the fan rotates. The reflow furnace as described in any one of Claims 5. A reflow comprising a reflow main body having a motor, a fan connected to the motor via a rotating shaft, and a case member for housing the fan, and a flux recovery device for recovering a flux generated by a reflow process of the reflow main body A furnace,
The flux recovery device is
A base member attached to the reflow body;
A drain portion that is provided on a side of the base member facing the fan and that is provided at a peripheral portion of the base member, and that allows the flux generated by the reflow process to flow in and is discharged to the outside, and is inserted inside the drain portion. A discharge pipe that is removably attached;
A reflow furnace, comprising: a recovery container attached to an end portion on the downstream side of the discharge pipe and for collecting the flux discharged from the drain part through the discharge pipe.

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