JP2018122197A - Flux recovery device, reflow device, and gas exchange method in the flux recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flux recovery device and a reflow device which can improve workability of maintenance work of the flux recovery device, and provide a gas exchange method for replacing inside gas in the flux recovery device.SOLUTION: A flux recovery device 5 for recovering vaporized flux generated in soldering an electronic circuit board includes a first piping part 14a which passes gas containing the vaporized flux to the flux recovery device 5, a dust collecting part 20 which solidifies the vaporized flux passing through the first piping part 14a by plasma discharge means and collects dust, a first piping valve 15a arranged on the first piping part 14a, a first exhaust path 16a having a first exhaust valve 17a, and a first intake path 18a having a first intake valve 19a. Gas in the flux recovery device 5 is exhausted through the first exhaust path 16a by closing a flow passage of the first piping part 14a and opening the first exhaust path 16a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flux recovery device that recovers vaporized flux generated in a reflow process, a reflow device that includes the flux recovery device, and a gas exchange method that replaces internal gas in the flux recovery device.

  In a board manufacturing process for manufacturing an electronic circuit board on which electronic components are mounted, a board on which electronic components are mounted at a soldering location is carried into a reflow apparatus. Paste cream solder containing solder particles in the flux component is pre-applied to the soldering location of the substrate. In the reflow device, the substrate is heated in accordance with a predetermined heating pattern, so that the solder in the cream solder is The particles are melted and the electronic component is soldered to the electrode of the substrate.

  In this soldering, exhaust gas containing vaporized flux generated by heating the flux component in cream solder is generated. In the process in which the exhaust gas flows through the reflow device, if the vaporized flux contacts the inner surface such as the inner wall or ceiling surface of the reflow device and is cooled to a temperature below the dew point, the liquefied or solidified flux from the gaseous state is Adhere to. When this adhesion progresses, there arises a problem that the adhered and deposited flux drops and soils the substrate to be worked.

  As a countermeasure against such a problem caused by the vaporized flux, a method of attracting and collecting the vaporized flux by charging the vaporized flux is known (see Patent Document 1). In the prior art disclosed in Patent Document 1, a gas containing a vaporization flux generated when an electronic component is soldered to a printed circuit board is charged by corona discharge, which is a kind of plasma discharge, and is opposite to the charged vaporization flux. A collection flux charged to polarity is attracted by vaporization flux to be agglomerated and liquefied.

Japanese Patent No. 4580590

  Since the reflow apparatus is continuously operated for a long time, the contamination of the substrate and the inner surface of the apparatus by the vaporized flux continuously proceeds while the operation is continued. For this reason, in order to prevent such problems due to fouling, it is required that the maintenance work for removing the flux of the collection object obtained by agglomerating the vaporized flux can be performed as easily as possible with good workability. However, the prior art including Patent Document 1 does not disclose a maintenance work for removing a recovery target obtained by aggregating and solidifying the vaporized flux, and a measure for improving the workability of the maintenance work has been demanded.

  Therefore, an object of the present invention is to provide a flux recovery apparatus and a reflow apparatus that can improve the workability of maintenance work of the flux recovery apparatus, and a gas exchange method that replaces the internal gas in the flux recovery apparatus.

  The flux recovery device of the present invention is a flux recovery device that recovers vaporized flux generated during soldering of an electronic circuit board on which electronic components are mounted. In the flux recovery device, the first gas that passes the gas containing the vaporized flux is passed through the flux recovery device. A pipe part, a dust collecting part that solidifies and collects the vaporized flux that has passed through the first pipe part by plasma discharge means, a first exhaust path provided in the first pipe part, and the first pipe A first intake path provided in a section, a first exhaust valve that opens and closes a flow path of the exhaust path, a first intake valve that opens and closes a flow path of the intake path, and a flow path of the first piping section A first piping valve that opens and closes.

  The reflow apparatus of this invention has the flux collection | recovery apparatus in any one of Claim 1 or 2.

  The gas exchanging method in the flux collecting apparatus of the present invention is the gas exchanging method in the flux collecting apparatus that collects the vaporized flux generated when the electronic circuit board on which the electronic component is mounted is soldered. A first piping closing step for closing the flow path of the first piping portion through which the gas containing the flux is passed; and a first exhaust passage opening step for opening the first exhaust passage provided in the first piping portion.

  According to the present invention, it is possible to improve workability of maintenance work of the flux recovery apparatus.

Structure explanatory drawing of the reflow apparatus which has the flux collection | recovery apparatus of one embodiment of this invention Structure explanatory drawing of the flux collection | recovery apparatus of one embodiment of this invention Structure explanatory drawing of the flux collection | recovery apparatus of one embodiment of this invention Explanatory drawing of a structure and function of a dust collection part in the flux collection | recovery apparatus of one embodiment of this invention Explanatory drawing of a structure and function of a dust collection part in the flux collection | recovery apparatus of one embodiment of this invention Flow chart of maintenance processing in the flux recovery apparatus of an embodiment of the present invention Explanatory drawing of the maintenance process in the flux collection | recovery apparatus of one embodiment of this invention

  Next, embodiments of the present invention will be described with reference to the drawings. First, the overall configuration of the reflow apparatus 1 in the present embodiment will be described with reference to FIG. The reflow apparatus 1 has a function of soldering an electronic circuit board on which an electronic component is mounted by a component mounting apparatus in an electronic circuit board manufacturing line for manufacturing an electronic circuit board by mounting an electronic component on a board. .

  In FIG. 1, the reflow apparatus 1 includes a reflow furnace 2, a recovery unit 3, and a piping unit 4. The reflow furnace 2 heats and cools the electronic circuit board after mounting the components carried in from the upstream component mounting apparatus according to a predetermined heating profile. As a result, the solder component in the cream solder supplied to the soldering site in the pre-process of component mounting is melted and solidified to bond the component to the substrate. The recovery unit 3 has a function of solidifying and recovering the vaporized flux generated when the flux component in the cream solder supplied to the soldering site is vaporized by heating at the time of soldering by the reflow furnace 2. Yes.

  The piping unit 4 has a function of guiding the exhaust gas containing the vaporized flux discharged from the reflow furnace 2 to the recovery unit 3 and returning the gas from which the vaporized flux has been removed by the recovery unit 3 to the reflow furnace 2. That is, the reflow apparatus 1 shown in the present embodiment has a configuration including a flux recovery apparatus 5 that recovers vaporized flux generated during soldering of an electronic circuit board on which electronic components are mounted.

  Hereinafter, the structure of the reflow furnace 2, the collection | recovery part 3, and the piping part 4 is demonstrated. In FIG. 1, the reflow furnace 2 has a configuration in which a heating furnace 11 is disposed inside a closed cover casing portion 10 and a reflow conveyor 12 that penetrates the cover casing portion 10 from the upstream side to the downstream side is provided. ing. The reflow conveyor 12 is connected to the carry-out conveyor 12a of the upstream apparatus and the carry-in conveyor 12b of the downstream apparatus, and the electronic circuit board 7 on which components are mounted is transferred from the carry-out conveyor 12a to the reflow conveyor 12 (arrow a). Thus, the electronic circuit board 7 is carried into the introduction part 10 a of the cover housing part 10.

  The heating furnace 11 disposed downstream of the introduction unit 10a is provided with a preheating unit 11c, a preheating zone 11a including a main heating unit 11d, and a main heating zone 11b. By operating the preheating unit 11c and the main heating unit 11d, the preheating zone 11a and the main heating zone 11b are maintained in a predetermined temperature atmosphere. Then, the electronic circuit board 7 carried into the heating furnace 11 by the reflow conveyor 12 sequentially moves to the preheating zone 11a and the main heating zone 11b, whereby the electronic circuit board 7 is heated according to a predetermined temperature profile. As a result, the solder component in the cream solder is melted at the soldering portion of the electronic circuit board 7.

  Next, the electronic circuit board 7 is unloaded from the heating furnace 11 and moved to the cooling zone 10b. A cooling unit 10d is provided in the cooling zone 10b, and the electronic circuit board 7 moved to the cooling zone 10b is cooled by operating the cooling unit 10d. Thereby, the molten solder is solidified at the soldering site, and the soldering is completed. The electronic circuit board 7 after soldering is transferred from the reflow conveyor 12 to the carry-in conveyor 12b of the downstream apparatus (arrow b) and carried out downstream.

  During heating in the heating furnace 11 described above, a gas containing vaporized flux is generated in which the flux component in the cream solder is vaporized by heating. Branch portions 13a and 13b where the exhaust duct 13 branches are opened on the ceiling surfaces of the preheating zone 11a and the main heating zone 11b, and the gas containing the vaporized flux generated in the preheating zone 11a and the main heating zone 11b is Then, the air is exhausted from the exhaust duct 13 through the branch portions 13a and 13b.

  The exhaust duct 13 is connected to a first piping portion 14a constituting the piping portion 4, and the first piping portion 14a is connected to a flux recovery device via a first piping valve 15a that opens and closes the flow path of the first piping portion 14a. 5 is connected. A first exhaust path 16a is connected to the first piping section 14a, and the first exhaust path 16a is opened to the outside via a first exhaust valve 17a.

Also the first pipe portion 14a, which is connected to the first intake passage 18a through the first intake valve 19a is further first intake passage 18a via the _{N 2} gas supply pipe 6a _{N 2} gas generator 6 Connected with. The N ₂ gas generator 6 has a function of generating N ₂ gas (nitrogen gas) for making the atmosphere in the heating furnace 11 in which the reflow process is performed an inert atmosphere. By opening the first intake valve 19a, the _{N 2} gas generated in the _{N 2} gas generating device 6, flows into the first pipe portion 14a via the _{N 2} gas supply pipe 6a and the first intake passage 18a (arrow g ).

  By opening the first piping valve 15a, the exhaust from the exhaust duct 13 is sent to the flux recovery device 5 via the first piping portion 14a (arrows c and d), where the vaporized flux in the exhaust is recovered. Is done. Connected to the flux recovery device 5 is a second piping portion 14b that communicates with a return duct 10c that opens into the cooling zone 10b of the reflow furnace 2. A second piping valve 15b that opens and closes the flow path of the second piping portion 14b is interposed in the second piping portion 14b. By opening the second piping valve 15b, vaporized flux is generated in the flux recovery device 5. The recovered gas is refluxed to the cooling zone 10b through the second piping portion 14b (arrows e and f).

A second exhaust path 16b is connected to the second piping portion 14b, and the second exhaust path 16b is opened to the outside via a second exhaust valve 17b. A second intake passage 18b is connected to the second piping portion 14b via a second intake valve 19b. Further, the second intake path 18b is connected to the N ₂ gas generator 6 via the N ₂ gas supply pipe 6b. By opening the second intake valve 19b, _{N 2} gas generated in the _{N 2} gas generating device 6, flows into the second piping section 14b through the second intake passage 18b (arrow h).

  Next, with reference to FIG. 2, the structure and function of the flux collection | recovery apparatus 5 and the piping part 4 are demonstrated. In FIG. 2, the flux collecting device 5 includes a dust collecting unit 20 having a first dust collecting unit 21, a second dust collecting unit 22, and a circulation fan 23. A first piping portion 14a through which a gas containing vaporized gas fed from the reflow furnace 2 is passed through an end portion on the entry side (right side in FIG. 2) of the first dust collecting portion 21 via the first one-touch joint 21a. Are detachably connected.

  The first dust collection unit 21 has a function of solidifying and collecting the vaporized flux that has passed through the first piping unit 14a by the plasma discharge means shown in FIG. The first one-touch joint 21a is a first joint means that allows the first piping part 14a and the first dust collecting part 21 of the dust collecting part 20 to be detachable. As shown in FIG. 4, the first one-touch joint 21 a is configured by combining an adapter 21 c that protrudes from the end of the first dust collecting portion 21 and a coupler 21 d that can be fitted and removed from the adapter 21 c. .

  In addition, a second piping portion 14b through which gas recirculated to the reflow furnace 2 after the vaporized flux is collected is provided at the end of the second dust collecting portion 22 on the exit side (right side in FIG. 2). It is detachably connected via the joint 22a. The second one-touch joint 22a is a second joint means that allows the second piping part 14b and the second dust collecting part 22 of the dust collecting part 20 to be detachable. The second one-touch joint 22a is configured by combining an adapter 22c that protrudes from the end of the second dust collecting portion 22 and a coupler 22d that is detachable from the adapter 22c (see FIG. 4).

  A circulation fan 23 is detachably connected to the exit side (left side in FIG. 2) end of the first dust collecting unit 21 via a third one-touch joint 21b. The third one-touch joint 21b is configured by combining an adapter 21e provided so as to protrude from the end portion of the first dust collecting portion 21 and a coupler 21f that is detachable from the adapter 21e. Further, a second dust collecting portion 22 is detachably connected to the end of the circulation fan 23 on the exit side (right side in FIG. 2) via a fourth one-touch joint 22b. The fourth one-touch joint 22b is configured by combining an adapter 22e provided so as to protrude from the end of the second dust collecting portion 22 and a coupler 22f that is detachable from the adapter 22e.

  The circulation fan 23 has a function of circulating the gas containing the vaporized flux that has passed through the first dust collecting unit 21. And the 2nd dust collection part 22 solidifies the vaporization flux which passed the circulation fan 23 with the plasma discharge means shown in FIG. In this configuration, by operating the circulation fan 23, the gas that is sent from the reflow furnace 2 to the dust collection unit 20 of the flux recovery device 5 and collects the vaporized flux is collected between the reflow furnace 2 and the flux recovery device 5. The heating efficiency in the reflow furnace 2 can be improved.

  In the above configuration, the third one-touch joint 21b is a third joint means that allows the first dust collector 21 and the circulation fan 23 to be detachable, and the fourth one-touch joint 22b circulates with the second dust collector 22 and the circulation. This is a fourth joint means that allows the fan 23 to be attached and detached. With such a configuration, the dust collection unit 20 including the first dust collection unit 21 and the second dust collection unit 22 can be removed from the flux collection device 5. As a result, the first dust collecting unit 21 and the second dust collecting unit 22 were removed from the flux collecting device 5 for the maintenance work for removing the flux adhering to the inside of the first dust collecting unit 21 and the second dust collecting unit 22. It can be performed with good workability.

  Next, the function of the piping part 4 is demonstrated. As shown in FIG. 2, a first piping valve 15 a that opens and closes the flow path of the first piping portion 14 a is provided in the first piping portion 14 a that passes the gas containing the vaporized flux exhausted from the reflow furnace 2 through the dust collecting portion 20. Is provided. A second piping valve 15b that opens and closes the flow path of the second piping portion 14b is provided in the second piping portion 14b through which the gas after the vaporized flux is collected by the dust collecting portion 20 is passed.

  In a normal operation state, both the first piping valve 15a and the second piping valve 15b are in an open state, and the exhaust gas sent from the reflow furnace 2 is sent to the first dust collecting portion 21 via the first piping portion 14a. (Arrows c and d). The gas after collecting the vaporized flux by the dust collecting unit 20 is sent to the second dust collecting unit 22 by the circulation fan 23, where the vaporized flux is collected again. Then, the gas after collecting the vaporized flux returns to the reflow furnace 2 through the second piping portion 14b (arrows e and f). At this time, by closing the first piping valve 15a and the second piping valve 15b, the gas circulation between the reflow furnace 2 and the flux recovery device 5 is blocked. Thereby, the flux collection | recovery apparatus 5 can be open | released in the state by which the air supply from the reflow furnace 2 was interrupted | blocked at the time of work, such as a maintenance.

  The first piping section 14a is provided with a first exhaust path 16a and a first intake path 18a. Further, the first exhaust path 16a and the first intake path 18a respectively correspond to the first exhaust path 16a and the first intake path 18a. A first exhaust valve 17a and a first intake valve 19a for opening and closing the flow path are provided. The second piping section 14b is provided with a second exhaust path 16b and a second intake path 18b, and the second exhaust path 16b and the second intake path 18b are respectively connected to the second exhaust path 16b and the second intake path 18b. A second exhaust valve 17b and a second intake valve 19b that open and close the flow path are provided.

With the first piping valve 15a and the second piping valve 15b closed, the first exhaust valve 17a and the second exhaust valve 17b are opened, so that the gas in the flux recovery device 5 is supplied to the first exhaust path 16a and the second exhaust valve 16b. It can be discharged to the outside through the exhaust path 16b. The first intake valve 19a, by opening the second intake valve 19b, it is possible to introduce the _{N 2} gas generated by the _{N 2} gas generating device 6 first piping section 14a, in the second piping section 14b.

  Instead of the configuration of the piping unit 4 shown in FIG. 2, a simplified piping unit 4A as shown in FIG. 3 may be used. In the piping portion 4A, only the second exhaust path 16b including the second exhaust valve 17b is provided in the second piping portion 14b connected to the first dust collecting portion 21. Here, the second exhaust valve 17b is opened in a normal operation state, and the gas sent from the reflow furnace 2 to the flux recovery device 5 through the first piping part 14a circulates and returns to the reflow furnace 2. Without being discharged from the second exhaust path 16b (arrow j). By adopting such a configuration, the equipment configuration can be simplified and the equipment cost can be reduced.

  Next, with reference to FIG. 4 and FIG. 5, the structure and function of the dust collection part 20 in the flux collection | recovery apparatus 5 are demonstrated. The dust collecting unit 20 has a configuration in which a first dust collecting unit 21 and a second dust collecting unit 22 each having a substantially rectangular parallelepiped box shape (see FIG. 7) are arranged in parallel in the flux collecting apparatus 5. FIG. These schematically show horizontal sections of the first dust collecting part 21 and the second dust collecting part 22.

  As shown in FIG. 4, the first dust collecting portion 21 and the second dust collecting portion 22 have basically the same structure, both of which are needle electrodes 24 and 26 held by electrode holders 24a and 26a, and a dust collecting electrode. 25 and 27 are arranged so as to face each other. The needle electrodes 24 and 26 are both plasma discharge electrodes having a pointed tip. In the present embodiment, the electrode holders 24a and 26a are arranged symmetrically on the center side. The space S1 between the electrode holder 24a and the dust collection electrode 25 in the first dust collection part 21 and the space S2 between the electrode holder 26a and the dust collection electrode 27 in the second dust collection part 22 are gas containing vaporized flux. To form a processing space for collecting dust.

  As shown in FIG. 7, the first dust collecting portion 21 and the second dust collecting portion 22 include a box-shaped portion A provided with needle electrodes 24 and 26 and a lid portion provided with dust collecting electrodes 25 and 27. It is divided into B and the lid B is opened with respect to the box-shaped part A so that the internal maintenance can be performed.

  The flux collection device 5 includes a power supply unit 29 that supplies power to the dust collecting unit 20. The power supply unit 29 is controlled and operated by the power supply control unit 31, and thereby the power supply unit 29 is connected via the power line 30 connected to the power supply unit 29. Then, electric power is supplied to the first dust collecting unit 21 and the second dust collecting unit 22 of the dust collecting unit 20. The power line 30 includes a connector 28 that allows the power source unit 29 and the first dust collecting unit 21 and the second dust collecting unit 22 to be detachable.

  That is, as shown in FIG. 7A, the first dust collecting portion 21 and the second dust collecting portion 22 are provided with connecting convex portions 28 a constituting the connector 28, and are connected to the end of the power line 30. The power line 30 can be attached to and detached from the first dust collecting part 21 and the second dust collecting part 22 by fitting and detaching the connection concave part 28b to and from the connection convex part 28a. In this way, the power line 30 is configured to be detachable from the first dust collecting unit 21 and the second dust collecting unit 22, thereby removing the flux adhering to the inside of the first dust collecting unit 21 and the second dust collecting unit 22. The maintenance work can be performed with the first dust collecting unit 21 and the second dust collecting unit 22 removed from the flux collecting device 5 and in a state of good workability.

  By supplying electric power to the first dust collecting unit 21 and the second dust collecting unit 22 by the power supply unit 29, a voltage is applied between the needle electrode 24 and the dust collecting electrode 25, and between the needle electrode 26 and the dust collecting electrode 27. Thus, plasma discharge can be generated in the spaces S1, S2 of the first dust collecting part 21 and the second dust collecting part 22. By this plasma discharge, ions are generated in the spaces S1 and S2. In the above-described configuration, the needle electrode 24 and the power supply unit 29 serve as plasma discharge means in the first dust collection unit 21. The needle electrode 26 and the power supply unit 29 serve as plasma discharge means in the second dust collection unit 22.

  At this time, the polarity of ions generated in the spaces S1 and S2 varies depending on the polarity of the needle electrodes 24 and 26 in voltage application. That is, by supplying power to the first dust collecting unit 21 by the power source unit 29, a voltage having the needle electrode 24 as a negative electrode and the dust collecting electrode 25 as a positive electrode is applied between the needle electrode 24 and the dust collecting electrode 25. Is done. As a result, negative ions 32 are generated around the tip of the needle electrode 24, and the generated negative ions 32 move in the space S1. On the other hand, by supplying power to the second dust collecting unit 22 by the power source unit 29, a voltage having the needle electrode 26 as a positive electrode and the dust collecting electrode 27 as a negative electrode between the needle electrode 26 and the dust collecting electrode 27. Is applied. As a result, positive ions 33 are generated around the tip of the needle electrode 26, and the generated positive ions 33 move in the space S2.

  FIG. 5 schematically shows a state when the above-described plasma discharge means is operated in a state in which the vaporization flux is passed through the dust collection unit 20. When the gas to be treated including the vaporized flux is fed into the space S1 of the first dust collecting portion 21 from the first piping portion 14a (see FIG. 2) via the first one-touch joint 21a (arrow n), The vaporized flux particles 34 in the gas are sent into the space S1.

  At this time, by operating the circulation fan 23, the gas in the space S1 is sucked to the outside from the third one-touch joint 21b (arrow o), and inside the space S1, the first one-touch joint 21a is changed to the third one-touch joint 21b. A gas flow is generated. Of the vaporized flux particles 34 that move due to the flow of the gas, positively charged particles are attracted to and captured by the negative ions 32 present in the space S1. As a result, the vaporized flux particles 34 trapped by the negative ions 32 become vaporized flux particles 34 (−) having a negative charge, attracted to and attached to the dust collection electrode 25 having a positive charge of reverse polarity, and collected. Is done.

  Next, the gas sucked to the outside from the third one-touch joint 21b is sent into the space S2 of the second dust collecting portion 22 through the fourth one-touch joint 22b by the circulation fan 23 (arrow p). This gas contains vaporized flux particles 34 that have not been collected by the first dust collection unit 21, that is, vaporized flux particles 34 having a negative charge. These vaporized flux particles 34 are attracted and captured by positive ions 33 present in the space S2.

  As a result, the vaporized flux particles 34 trapped by the positive ions 33 become vaporized flux particles 34 (+) having a positive charge, attracted to and attached to the dust collecting electrode 27 having a negative charge having a reverse polarity, and collected. Be dusted. The gas after being collected in two stages by the first dust collecting portion 21 and the second dust collecting portion 22 in this way is supplied to the second piping portion 14b (see FIG. 2) via the second one-touch joint 22a. ) (Arrow q).

  In the flux recovery apparatus 5 shown in the present embodiment, the control of the power supply unit 29 in the plasma discharge means used for dust collection targeting the vaporized flux is performed by the following control method. That is, as shown in FIG. 4, the power supply control unit 31 that controls the power supply unit 29 is configured to have two control functions of a current control unit 31a and a discharge control unit 31b.

  The current control part 31a controls the power supply part 29 which comprises a plasma discharge means by the control pattern which carries out constant current control. In this control pattern, the current between the plasma discharges is maintained at a preset specified current value regardless of the state of flux adhering to the needle electrodes 24, 26 and the dust collecting electrodes 25, 27. Control the applied voltage.

  That is, in the process of continuously operating the flux recovery device 5, the fouling of the solidified flux adhering to the inside of the flux recovery device 5 such as the needle electrode 24, the needle electrode 26, and the dust collection electrodes 25 and 27 progresses. As a result, the amount of discharge in the plasma discharge decreases, and the dust collecting action tends to decrease. Even in such a state, by adopting the above-described constant current control, discharge is performed in accordance with the fouling state inside the flux recovery device 5, in other words, the amount of vaporized flux to be collected in the flux recovery device 5. The amount can be increased, and a desired dust collecting action can be maintained.

  Moreover, the discharge control part 31b controls the power supply part 29 with the control pattern which controls the discharge amount of a plasma discharge means. That is, in this control pattern, the amount of discharge required to maintain a desired dust collecting action is increased according to the operating status of the reflow furnace 2. For example, the discharge amount is increased in proportion to the increase in the number of electronic circuit boards 7 processed in the reflow furnace 2. Alternatively, the discharge amount is increased in proportion to the passage of the operation time of the reflow furnace 2. In any example, the discharge amount is increased in accordance with the fouling state inside the flux recovery device 5 predicted according to the operation status, in other words, the amount of vaporized flux to be collected in the flux recovery device 5. Thus, the power supply unit 29 is controlled.

  By using such a control method, there is a problem in the control method for controlling the plasma discharge means based on the detection result of the vaporized flux detection means arranged in the flux recovery device, that is, the aggregated flux is not It is possible to prevent the discharge amount from being poorly controlled by controlling the plasma discharge means based on the inaccurate detection result resulting from the adhesion to the detection means.

  Next, the maintenance process of the flux recovery apparatus 5 that is performed in the process of continuously operating the reflow apparatus 1 will be described with reference to the drawings in accordance with the flow of FIG. In the operating state of the reflow apparatus 1, the gas to be processed is sent from the reflow furnace 2 to the flux recovery apparatus 5 via the first piping part 14 a, and the return gas after the dust collection process is finished by the flux recovery apparatus 5. Is recirculated to the reflow furnace 2 via the second piping part 14b. In the maintenance process performed here, an operation of removing the flux adhering to the inside of the dust collection unit 20 of the flux collection device 5 due to dust collection is performed.

  In the maintenance work, first, the flow paths of the first piping portion 14a and the second piping portion 14b are closed (ST1). That is, by closing the first piping valve 15a and the second piping valve 15b, the flow of gas between the flux recovery device 5 and the reflow furnace 2 is blocked. Next, the first exhaust path 16a and the second exhaust path 16b are opened, and the gas in the flux recovery device 5 is exhausted (ST2). That is, by opening the first exhaust valve 17a and the second exhaust valve 17b, the gas in the dust collecting unit 20 of the flux collection device 5 is exhausted from the first exhaust path 16a and the second exhaust path 16b to the outside. As a result, the high-temperature gas remaining in the dust collection unit 20 is exhausted, and the maintenance operation can be performed by manually opening the dust collection unit 20.

  Next, the dust collection unit 20 to be worked is removed (ST3). Here, the 1st dust collection part 21 and the 2nd dust collection part 22 which comprise the dust collection part 20 are removed, and it takes out to the exterior of the flux collection | recovery apparatus 5. FIG. When removing the first dust collecting portion 21, as shown in FIG. 7A, the coupler 21d is detached from the adapter 21c in the first one-touch joint 21a (arrow r), and the adapter 21e is detached from the third one-touch joint 21b. The coupler 21f is detached (arrow s), and the connector 28 is separated from the connection protrusion 28a (arrow t). FIG. 7 shows only an example of work that targets the first dust collection unit 21, but the same applies to the case of targeting the second dust collection unit 22.

  If the connection part of the first dust collecting part 21 is detached in this way, the first dust collecting part 21 is opened with the first dust collecting part 21 removed from the flux collecting device 5 and adhered to the inside. The collected flux is removed and collected (ST4). That is, as shown in FIG. 7B, the lid portion B provided with the dust collecting electrode 25 is opened (arrow u) with respect to the box-like portion A provided with the needle electrode 24, and the needle electrode 24, electrode An operation of removing the flux adhering to the inside of the first dust collecting portion 21 such as the holder 24a and the dust collecting electrode 25 is performed. In this work, the first dust collecting part 21 is in a place with a good working environment removed from the flux collecting device 5, and the first dust collecting part 21 is opened and the inside is exposed. Can be performed with good workability in a very good working environment.

  Next, the dust collector 20 that has undergone maintenance is reattached (ST5). That is, the first dust collecting portion 21 and the second dust collecting portion 22 that have completed the removal of the flux adhering to the inside are disposed inside the flux collection device 5, and the first one-touch joint 21a, the third one-touch joint 21b, 2 The one-touch joint 22a, the fourth one-touch joint 22b, and the connector 28 are connected. Next, the first exhaust path 16a and the second exhaust path 16b are closed (ST6). That is, by closing the first exhaust valve 17a and the second exhaust valve 17b, the first piping part 14a, the second piping part 14b, and the gas in the dust collecting part 20 of the flux recovery device 5 are blocked from being exhausted to the outside. .

Next, N ₂ gas is filled (ST7). That _{N 2} gas supply pipe 6a operates _{N 2} gas generating device 6, 6b in a state capable of supplying _{N 2} gas through the first intake valve 19a, to open the second intake valve 19b, a N ₂ gas is caused to flow into the first piping portion 14a and the second piping portion 14b through the first intake passage 18a and the second intake passage 18b.

Thereafter, the flow paths of the first piping portion 14a and the second piping portion 14b are opened (ST8). That is, by opening the first piping valve 15a and the second piping valve 15b, the gas flow between the flux recovery device 5 and the reflow furnace 2 is allowed. As a result, the N ₂ gas flowing into the first piping portion 14a and the second piping portion 14b reaches the reflow furnace 2, and the gas in the flux recovery device 5 and the reflow furnace 2 and in the flux recovery device 5 and the reflow furnace 2 The entire circulation path is filled with N ₂ gas. As a result, the flux recovery device 5 can be put into an operating state, and the vaporized flux can be collected and recovered.

The process flow described above constitutes a gas exchange method in the flux recovery apparatus 5 that recovers vaporized flux generated when the electronic circuit board 7 is soldered. In this gas exchange method, the example which uses only the 1st piping part 14a for the piping path | route for gas exchange is shown. That is, (ST1) of the above-described process flow is a first pipe closing process for closing the flow path of the first pipe portion 14a through which the gas containing the vaporized flux passes through the flux collecting device 5, and (ST2) This is a first exhaust path opening process for opening the first exhaust path 16a provided in the one piping portion 14a. Further, (ST6) is a first exhaust path closing step for closing the first exhaust path 16a, and filling with N ₂ gas (ST7) is a first intake path 18a provided in the first piping portion 14a. This corresponds to the first intake path opening step for releasing the.

  As described above, the flux recovery apparatus 5 included in the reflow apparatus 1 shown in the present embodiment is a flux recovery apparatus 5 that recovers vaporized flux generated when the electronic circuit board 7 is soldered. The first pipe part 14a for passing the gas containing the vaporized flux to the gas, the dust collecting part 20 for solidifying the vaporized flux passed through the first pipe part 14a by the plasma discharge means and collecting the dust, the first pipe part 14a and the dust collecting It is set as the structure provided with the 1st one-touch coupling 21a as a 1st coupling means which makes it possible to attach or detach with the part 20. FIG. With this configuration, the dust collection unit 20 can be removed from the first piping unit 14a at the time of maintenance work, and the work can be performed in a good working environment, and the workability of the maintenance work of the flux recovery apparatus can be improved. It has become.

  Moreover, in the flux collection | recovery apparatus 5 which has the structure similar to the above-mentioned, the structure of the piping part 4 is divided into the 1st exhaust path 16a provided in the 1st piping part 14a, and the 1st intake path provided in the 1st piping part 14a. 18a, a first exhaust valve 17a that opens and closes the flow path of the first exhaust path 16a, a first intake valve 19a that opens and closes the flow path of the first intake path 18a, and a flow path of the first piping section 14a. The first piping valve 15a is provided.

  With this configuration, it is possible to easily perform a ventilation operation for exchanging the gas inside the flux recovery device 5 during the maintenance operation of the flux recovery device 5. That is, the first piping closing step for closing the flow path of the first piping portion 14a through which the gas containing the vaporized flux passes through the flux recovery device 5, and the first exhaust path 16a provided in the first piping portion 14a is opened. By executing the one exhaust path opening step, the gas inside the flux recovery device 5 can be exhausted via the first exhaust path 16a.

  Further, in the flux recovery device 5 having the same configuration as described above, by providing a current control unit for controlling the plasma discharge means at a constant current, depending on the amount of vaporized flux regardless of the contamination state by the flux inside the flux recovery device 5. Therefore, it is possible to appropriately control the discharge amount of the plasma discharge.

  In the above, it demonstrated based on one Embodiment of this invention. It will be understood by those skilled in the art that various modifications can be made to these constituent elements and combinations of processing processes in this embodiment, and such modifications are within the scope of the present invention.

  In the above description, the corona discharge is described as an example of the plasma discharge means. However, by applying a voltage, the vaporized flux molecules are ionized into ions and electrons, and are attracted to the positive and negative electrodes of the dust collecting portion to collect the dust. If possible, discharge means such as glow discharge or arc discharge may be used.

  In the above description, the dust collecting unit 20 is detachable. However, the first dust collecting unit 21 and the second dust collecting unit 22 may be detachable.

Although in the above described with reference to N ₂ gas generating device 6 may flow into the gas other than N ₂ gas to the flux collecting apparatus 5 and reflow furnace 2.

  The flux recovery apparatus and reflow apparatus of the present invention and the gas exchange method in the flux recovery apparatus have the effect that the workability of the maintenance work of the flux recovery apparatus can be improved, and the electronic component is soldered to the electronic circuit board. It is useful in the field where it is installed.

DESCRIPTION OF SYMBOLS 1 Reflow apparatus 2 Reflow furnace 3 Collection | recovery part 4 Piping part 7 Electronic circuit board 11 Heating furnace 13 Exhaust duct 14a 1st piping part 14b 2nd piping part 15a 1st piping valve 15b 2nd piping valve 16a 1st exhaust path 16b 2nd Exhaust path 17a 1st exhaust valve 17b 2nd exhaust valve 18a 1st intake path 18b 2nd intake path 19a 1st intake valve 19b 2nd intake valve 20 dust collection part 21 1st dust collection part 21a 1st one-touch joint 21b 3rd One-touch coupling 22 Second dust collection part 22a Second one-touch coupling 22b Fourth one-touch coupling 23 Circulating fan 24, 26 Needle electrode 25, 27 Dust collection electrode 28 Connector 30 Power line 32 Negative ion 33 Positive ion 34 Vaporized flux particles A Box-shaped part B lid

Claims (5)

In a flux recovery device that recovers vaporized flux generated when soldering an electronic circuit board on which electronic components are mounted,
A first piping section through which the gas containing the vaporized flux passes through the flux recovery device;
A dust collection part that solidifies and collects the vaporized flux passing through the first pipe part by a plasma discharge means;
A first exhaust path provided in the first piping section;
A first intake path provided in the first piping section;
A first exhaust valve for opening and closing a flow path of the first exhaust path;
A first intake valve that opens and closes a flow path of the first intake path;
A flux recovery apparatus comprising: a first piping valve that opens and closes a flow path of the first piping section. The flux recovery device is
A second piping part through which the gas after collecting the vaporized flux in the dust collecting part is passed;
A second exhaust path provided in the second piping section;
A second intake path provided in the second piping section;
A second exhaust valve for opening and closing the flow path of the second exhaust path;
A second intake valve for opening and closing the flow path of the second intake path;
The flux recovery apparatus according to claim 1, further comprising a second piping valve that opens and closes a flow path of the second piping section.   A reflow apparatus comprising the flux recovery apparatus according to claim 1. In a gas exchange method in a flux recovery device that recovers vaporized flux generated when soldering an electronic circuit board on which electronic components are mounted,
A first pipe closing step for closing the flow path of the first pipe section through which the gas containing the vaporized flux passes through the flux recovery device;
A gas exchange method in a flux recovery apparatus, comprising: a first exhaust path opening step of opening a first exhaust path provided in the first piping section. A first exhaust path closing step of closing the first exhaust path;
The gas exchange method in the flux recovery apparatus according to claim 4, further comprising a first intake path opening step of opening a first intake path provided in the first pipe.

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