JP2007190567A - Soldering tank, and soldering apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soldering apparatus capable of easily performing the maintenance in a soldering tank. <P>SOLUTION: A soldering tank 12 comprises a box-shaped tank main body 13 with a top side thereof opened, a heater accommodation unit 15 having a recess 14 provided on its lower side by forming a bottom plate part 13a of the tank body 13 so as to be raised in the tank main body 13, and a block-shaped heater unit 16 fitted to the recess 14 of the heater accommodation unit 15 from the outer side of the tank main body 13. An upward taper is formed on the recess 14 of the heater accommodation unit 15 and the block-shaped heater unit 16. A heater pressing means 31 for pressing the heater unit 16 against the recess 14 of the heater accommodation unit 15 is provided on a lower part of the heater unit 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solder bath having a block-shaped heater unit and a soldering apparatus.

By inserting a block heater unit into the solder bath, melting the solder contained in the solder bath, and controlling the temperature, the surface of the heater unit is increased by increasing the solder contact area of the heater compared to when using the heater individually. There is a soldering apparatus in which the temperature is made uniform and the surface shape is simplified so that the solder flows smoothly in the solder bath so that heat spots can be suppressed (for example, see Patent Document 1).
Japanese Patent Laying-Open No. 2005-52857 (first page, FIG. 1)

  Thus, when the heater unit is installed in the solder tank, there is a problem that maintenance in the solder tank is not easy and, for example, inspection and cleaning in the solder tank are difficult.

  This invention is made | formed in view of such a point, and it aims at providing the soldering apparatus which can perform the maintenance in a solder tank easily.

  According to the first aspect of the present invention, there is provided a box-shaped tank body having an open upper surface, and a recessed portion for fitting the heater unit whose lower side is opened by forming the bottom plate portion of the tank body so as to rise in the tank body. And a block-shaped heater unit fitted from the outside of the tank body into the heater storage section.

  According to a second aspect of the present invention, in the solder bath according to the first aspect, the concave portion of the heater housing portion and the block-shaped heater unit are tapered upward so that the heater unit is recessed in the heater housing portion. A heater pressing means for pressing is provided.

  The invention according to claim 3 is the solder bath according to claim 1 or 2, the nozzle for the jet flow detachably provided on the upper portion of the bath body of the solder bath, and the molten solder in the bath body to the nozzle. A soldering device including a pump for supplying pressure.

  According to a fourth aspect of the present invention, the pump in the soldering apparatus according to the third aspect is an electromagnetic induction pump, and is detachably inserted into the primary iron core and coil provided outside the tank body and the inside of the tank body. And a secondary iron core having an attached molten solder rising passage.

  According to a fifth aspect of the present invention, in the soldering apparatus according to the third or fourth aspect, the tank body is formed by enlarging the upper part provided with the nozzle in the plane direction with respect to the lower part provided with the pump. A flat heater is disposed along the outer surface of the upper part of the main body.

  According to the first aspect of the present invention, the outside of the tank main body is provided in the heater storage section having the recessed portion for fitting the heater unit opened at the lower side by forming the bottom plate portion of the tank main body so as to rise in the tank main body. Since the block-shaped heater unit is fitted, maintenance in the solder bath can be facilitated without removing the heater unit. Moreover, the heat generated from the heater unit fitted in the recess of the heater housing portion is efficiently transmitted to the solder in the tank body, and the heating efficiency can be improved.

  According to the second aspect of the invention, the heater unit tapered toward the upper side is pressed by the heater pressing means against the concave portion of the similarly tapered heater storage unit. And the block-shaped heater unit can be brought into close contact with each other, and the occurrence of an air gap can be prevented, and good heat conduction from the heater unit to the solder in the tank body can be ensured.

  According to the third aspect of the present invention, since the nozzle for jetting is detachably provided at the upper part of the tank body, the maintenance in the solder tank can be facilitated by removing the nozzle from the tank body.

  According to the fourth aspect of the present invention, the primary iron core and coil of the electromagnetic induction pump are provided outside the tank body, and the secondary iron core inside the tank body is detachably inserted. The iron core can be removed to facilitate maintenance inside the solder bath.

  According to the fifth aspect of the present invention, since the flat heater is disposed along the outer surface of the upper portion of the tank body formed to expand in the plane direction in order to receive the jet wave from the nozzle, this flat Maintenance in the solder bath can be facilitated with the heater attached. This flat heater also has a function of melting solder from the surface side at the start of operation.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.

  FIG. 1 shows a soldering apparatus 11, and a solder tank 12 is formed by raising a box-shaped tank body 13 having an open upper surface and a bottom plate portion 13 a of the tank body 13 so as to rise in the tank body 13. A heater storage portion 15 having a recess 14 for fitting the heater unit opened at the lower side, and a block-shaped heater unit 16 fitted from the outside of the tank body 13 to the recess 14 of the heater storage portion 15 are provided. Yes. The block-shaped heater unit 16 is integrated by fitting a heater portion 18 inside a block portion 17 formed of aluminum or copper.

  The tank body 13 has a lower part for installing the pump separated into a primary tank part 21 and a secondary tank part 22 by the heater accommodating part 15, and an upper part 13b for installing the nozzle is expanded in the plane direction with respect to the lower part. And is engaged with the upper frame 23. An inclined surface portion 24 is provided on the upper portion 13 b of the tank body 13, and a flat flat heater 25 is attached to the outer surface of the inclined surface portion 24 by a pressing plate 27 via a heat insulating material 26.

  The concave portion 14 of the heater accommodating portion 15 and the block-shaped heater unit 16 have a taper that tapers upward. The lower portion of the heater unit 16 presses the heater unit 16 against the concave portion 14 of the heater accommodating portion 15. A heater pressing means 31 is provided.

  The heater pressing means 31 has a guide member 32 formed in a concave shape as shown in FIG. 1 attached to a pair of frames 33 arranged below the heater unit 16 as shown in FIG. In addition, a height adjusting member 34 is installed between the guide members 32. An inclined surface 35 is provided on the surfaces of the guide member 32 and the height adjustment member 34 that are in contact with each other, and the tip end portion 36 of the height adjustment member 34 is bent into a hook shape and is screwed onto the tip portion 36. The tip of the inserted adjustment screw 37 is in contact with one guide member 32.

  Therefore, when the adjustment screw 37 is rotated and the height adjustment member 34 is pulled out, the height adjustment member 34 rises while sliding with respect to the guide member 32 by the action of the inclined surface 35, and the block-shaped heater unit 16 can be pushed up and brought into close contact with the recess 14 of the heater housing 15.

  Returning to FIG. 1, nozzle mounting portions 41 respectively corresponding to the primary tank portion 21 and the secondary tank portion 22 are detachably provided by bolts (not shown) on the upper portion of the bath body 13 of the solder bath 12. Further, a primary jet (turbulent) nozzle 43 and a secondary jet (rectifying) nozzle 44 are detachably fitted to the rectangular tube portion 42 of the nozzle mounting portion 41, respectively. Above these nozzles 43 and 44, a conveyor 45 for conveying a workpiece W such as a component mounting board to be soldered is disposed.

  These nozzles 43 and 44 are provided with electromagnetic induction pumps 51 as pumps for supplying molten solder in the tank body 13 under pressure. These electromagnetic induction pumps 51 include a primary iron core 52 and a coil 53 provided outside the tank body 13, and a secondary iron core 55 having a molten solder rising passage 54 detachably inserted into the tank body 13. It is equipped with. On the primary iron core 52 and the coil 53, a cooling fan 57 attached to the exterior plate 56 is installed facing the primary iron core 52 and the coil 53.

  As shown in FIG. 3, the secondary iron core 55 is fitted between the left and right iron core guides 58 provided inside the tank body 13, but is pulled upward from between these iron core guides 58. Is possible.

  As shown in FIGS. 3 and 4, a drain block 61 is provided in the bottom plate portion 13 a of the tank body 13, and a passage that communicates the primary tank section 21 and the secondary tank section 22 in the drain block 61. 62 is formed, and a drain pipe 63 is connected in communication with the central portion of the passage 62. The drain pipe 63 is normally closed by a plug 64.

  Next, the function and effect of this embodiment will be described.

  When starting operation, first, the solder in the tank body 13 is melted from the surface side by the flat heater 25, and the block-like heater unit 16 is energized sequentially from the heater portion 18 located above, so that the bottom solder is on the surface. The bumping phenomenon that occurs when the solder is melted before the side solder is prevented.

  During soldering, the coil 53 of the electromagnetic induction pump 51 is energized to generate an upward thrust on the molten solder in the molten solder rising passage 54 due to the action of the moving magnetic field, and the molten solder in the tank body 13 is melted. While being sucked into the lower end opening of the solder ascending passage 54, the molten solder ascending passage 54 is pressurized and supplied into the nozzles 43 and 44 and jetted from these nozzles 43 and 44 to solder the workpiece W. At that time, the wettability in the high-density mounting substrate or the like is ensured by the primary jet (turbulent flow) wave from the nozzle 43, and good solder cut shaping is performed by the secondary jet (rectification) from the nozzle 44.

  At the time of maintenance, the plug 64 of the drain pipe 63 is opened, the molten solder inside the primary tank part 21 and the secondary tank part 22 is discharged to the outside, and the nozzles 43 and 44 are connected to the rectangular tube part 42 of the nozzle mounting part 41. And the nozzle mounting part 41 is further removed from the upper part of the tank body 13. At this time, the secondary iron core 55 integral with the nozzle mounting portion 41 is taken out from between the iron core guides 58 in the tank body 13.

  Thereby, in the tank body 13, only the iron core guide 58 of the vertical ridge remains, and the block-shaped heater unit 16 and the flat heater 25 cannot be seen, so the inner surface of the tank body 13 can be observed from the upper side, It is possible to accurately grasp the erosion status of the stainless steel that is the material of the tank body 13. Further, when the inner surface of the tank body 13 is cleaned, there is no obstacle like a conventional heater, so that the inside of the tank body 13 can be easily cleaned.

  When the block heater unit 16 is maintained, the adjustment screw 37 is rotated to move the height adjustment member 34 in the downward direction by the action of the inclined surface 35, and the block adjustment heater 34 is moved together with the height adjustment member 34. After the unit 16 is lowered, the unit 16 is taken out from the concave portion 14 of the heater accommodating portion 15. When the heater unit 16 is set again, if the adjustment screw 37 is rotated and moved in the direction in which the height adjustment member 34 is pulled out, the height adjustment member 34 rises due to the action of the inclined surface 35. The heater unit 16 can be pushed up, and the heater unit 16 can be brought into close contact with the recess 14 of the heater housing 15 so that an air gap does not occur.

  At this time, since the concave portion 14 of the heater accommodating portion 15 and the block-shaped heater unit 16 are tapered upwardly, the upward force of the heater pressing means 31 causes the block portion 17 in FIG. A pressing force that causes the entire surfaces of both sides to be in close contact with the recess 14 of the heater housing portion 15 is generated, and the occurrence of an air gap that hinders heat conduction can be prevented.

  In addition, due to the taper, the difference between the thermal expansion coefficients of the heater housing portion 15 of the solder bath 12 and the block portion 17 of the heater unit 16 causes the upper and lower portions between the concave portion 14 and the block portion 17 of the heater housing portion 15 to rise and fall. Since the deviation of the direction can be allowed, it is possible to prevent stress concentration from occurring in the tank body 13 due to this deviation, and it is possible to prevent the stainless steel passive film from being destroyed by the stress concentration, and Erosion from the destroyed part can be prevented.

  Further, even if a vertical shift occurs between the concave portion 14 of the heater storage portion 15 and the block portion 17, since there is a taper, the entire left and right sides of the block portion 17 in FIG. It is possible to maintain the state of being in close contact with the concave portion 14 of the.

  In this way, the bottom plate portion 13a of the tank main body 13 is formed so as to be raised in the tank main body 13, so that the heater housing portion 15 having the concave portion 14 for fitting the heater unit opened on the lower side is provided in the tank main body 13. Since the block-shaped heater unit 16 is fitted from the outside, maintenance in the solder bath 12 can be facilitated without removing the heater unit 16.

  Further, the heat generated from the heater unit 16 fitted in the concave portion 14 of the heater housing 15 is efficiently transmitted to the solder in the tank body 13 from the contact surfaces on the left and right sides of FIG. .

  Furthermore, since the heater unit 16 tapered toward the upper side is pressed by the heater pressing means 31 against the concave portion 14 of the heater storage portion 15 similarly tapered, the concave portion 14 of the heater storage portion 15 is pressed. And the block-shaped heater unit 16 can be brought into close contact with each other, and the occurrence of an air gap can be prevented to ensure good heat conduction from the heater unit 16 to the solder in the tank body 13 through the heater housing portion 15.

  Furthermore, since the nozzle mounting portion 41 and the jet nozzles 43 and 44 are detachably provided on the upper portion of the tank body 13, the nozzle mounting section 41 and the nozzles 43 and 44 can be removed from the tank body 13 by soldering. Maintenance in the tank 12 can be facilitated.

  Similarly, the primary iron core 52 and the coil 53 of the electromagnetic induction pump 51 are provided outside the tank body 13, and the secondary iron core 55 inside the tank body 13 is detachably inserted, so that the secondary from the solder tank 12 is provided. By taking out the iron core 55, the maintenance in the solder bath 12 can be facilitated.

  Further, since the flat heater 25 having a flat plate shape is disposed along the outer surface of the upper portion 13b of the tank body 13 formed to expand in the plane direction in order to receive the jet wave from the nozzles 43, 44, the flat heater 25 Maintenance in the solder bath 12 can be facilitated with the mark attached. The flat heater 25 also has a function of melting the solder from the surface side at the start of operation.

  Next, another embodiment not shown will be described.

  For the electromagnetic induction pump 51, an impeller pump using rotary blades may be used as the pump. Further, in the embodiment shown in FIG. 1, the heater accommodating portion 15 and the block-shaped heater unit 16 are applied in the lower portion of the tank main body 13, but these heater accommodating portion 15 and heater unit 16 are connected to a plurality of nozzles 43. , 44 may be extended. In this case, the flat heater 25 can be omitted.

It is sectional drawing which shows one Embodiment of the solder tank and soldering apparatus which concern on this invention. It is a side view which shows the heater unit of a soldering tank and a soldering apparatus same as the above. It is a top view of a solder tank and a soldering apparatus same as the above. It is sectional drawing which shows the molten solder drain part of a solder tank and a soldering apparatus same as the above.

Explanation of symbols

12 Solder bath
13 Tank body
13a Bottom plate
13b top
14 Recess
15 Heater storage
16 Block heater unit
25 Flat heater
31 Heater pressing means
43, 44 nozzles
51 Electromagnetic induction pump as a pump
52 Primary iron core
53 coils
54 Molten solder ascending passage
55 Secondary iron core

Claims (5)

A box-shaped tank body with an open top;
A heater housing portion having a recessed portion for fitting the heater unit whose lower side is opened by forming the bottom plate portion of the tank body so as to rise in the tank body;
A solder tank comprising: a block-like heater unit fitted into the heater housing portion from the outside of the tank body. The concave portion of the heater storage portion and the block-shaped heater unit are tapered upwardly,
The solder tank according to claim 1, further comprising a heater pressing unit that presses the heater unit against the concave portion of the heater housing. The solder bath according to claim 1 or 2,
A nozzle for a jet provided detachably on the upper part of the tank body of the solder tank;
A soldering apparatus comprising: a pump that pressurizes and supplies the molten solder in the tank body to the nozzle. The pump is an electromagnetic induction pump,
A primary iron core and a coil provided outside the tank body;
The soldering apparatus according to claim 3, further comprising: a secondary iron core having a molten solder rising passage that is detachably inserted into the tank body. The tank body is formed by expanding the upper part provided with the nozzle in the plane direction with respect to the lower part provided with the pump,
The flat plate heater is arrange | positioned along the outer surface of the upper part of this tank main body. The soldering apparatus of Claim 3 or 4 characterized by the above-mentioned.

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