JP5579219B2 - Nozzle device and spray device - Google Patents

Description

  The present invention relates to a nozzle device and a spray device.

  For example, when soldering to a printed circuit board, it is necessary to apply a liquid flux as a pre-soldering process. At this time, with respect to the portion where the flux is difficult to adhere, conventionally, masking according to the printed board is used to prevent the flux from adhering to other than the desired location.

  However, if the printed circuit board changes, the masking must be changed, and the masking must be periodically cleaned. As a result, the number of man-hours has increased. Therefore, in order to enable flux application without using masking, a spray control device that can control the diffusion range of the sprayed flux liquid has been proposed (for example, see Patent Document 1).

  The spray control device includes a hollow cylinder that surrounds the nozzle that sprays the flux liquid and extends above the nozzle. When such a spray control means is used, if the spray control device made of a cylinder is brought close to the printed circuit board, the diffusion range of the flux liquid is narrowed, and for example, flux application to a local region where through holes are arranged becomes possible.

JP 2003-347719 A

  However, when a plurality of through holes are arranged side by side, in the through holes near the end of the spray region, the amount of flux attached to the inner wall is reduced, and the soldering quality may be deteriorated.

  This is considered to be caused by the fact that the flux liquid inevitably diffuses even if the spray control means is used, so that the flux liquid enters obliquely with respect to the through hole. That is, it is desirable that the flux liquid be ejected in parallel as much as possible, rather than being ejected in a diffused state with respect to the through hole.

  The present invention has been made to solve the above-described problems caused by the prior art, and an object of the present invention is to provide a nozzle device and a spray device that can make the liquid ejection form as parallel as possible. To do.

In order to solve the above-described problems and achieve the object, the present invention provides a first nozzle portion in which a first injection port for spraying a liquid is formed, and a base end on an outer peripheral surface in the vicinity of the first injection port. brought into contact with the tapered portion formed in, it surrounds the first injection port, extends from the rear of the first injection port to other party, a second injection port for injecting the liquid to tip A cylindrical second nozzle portion provided at the base end of the second nozzle portion, in a notch shape , on the side opposite to the injection direction on the basis of the position of the first injection port An intake port is formed through which outside air is drawn as the liquid is sprayed from the first injection port.

  According to the present invention, since liquid can be sprayed as parallel as possible, the flux liquid can be reliably applied to the inner wall of, for example, a through hole, and the soldering quality can be maintained well. It becomes.

Drawing 1 is an explanatory view showing an outline of a spray device concerning an embodiment. FIG. 2 is an explanatory diagram of the nozzle device according to the embodiment. Drawing 3A is an explanatory view showing the state where flux was ejected using the nozzle device concerning an embodiment. FIG. 3B is an explanatory diagram showing a state in which flux is injected using a conventional nozzle device which is a comparative example. FIG. 4 is an explanatory diagram of a nozzle device according to a modification. FIG. 5 is an explanatory diagram of a nozzle device according to another modification. FIG. 6 is an explanatory diagram of a nozzle device according to another embodiment.

  Hereinafter, a nozzle device and a spray device according to the present embodiment will be specifically described with reference to the accompanying drawings. In the following, a case where a flux liquid is applied to a through hole provided in a printed board using a flux spray apparatus as a spray apparatus will be described as an example. However, the present invention is not limited to the following embodiments.

  First, the flux spray apparatus according to the embodiment will be described with reference to FIG. FIG. 1 is an explanatory diagram showing an outline of a flux spray apparatus. As illustrated, the flux spray device 100 is arranged such that the nozzle device 10 is positioned below a transport device 300 that transports the printed circuit board 200. The nozzle device 10 is connected in communication with a flux liquid supply device (not shown).

  The nozzle device 10 is set on a predetermined base 110 so that the flux liquid is jetted upward. The moving device 30 is connected to the base 110, and the moving device 30 allows the nozzle device 10 to move freely on the horizontal plane together with the base 110. That is, the nozzle device 10 can freely move in the XY directions in FIG.

  The printed circuit board 200 having a plurality of mounting components 210 provided on the surface thereof is supported in both ends by the conveying device 300 and conveyed in the direction of arrow F. And it stops at a predetermined | prescribed flux application position, and the application | coating operation | work of the flux by the nozzle apparatus 10 is performed.

  In the flux spray device 100, the drive timing of the moving device 30, the spray timing of the flux liquid, and the like are programmed in advance in a control unit (not shown). Therefore, it is possible to apply the flux to a desired region provided on the lower surface of the printed circuit board 200 to be the flux application surface. When the application of the flux is completed, the printed circuit board 200 is sent to the next process, and the mounting component 210 is soldered to the portion where the flux is applied.

  Here, the nozzle apparatus 10 with which the flux spray apparatus 100 is provided is demonstrated using FIG. FIG. 2 is an explanatory diagram of the nozzle device 10 according to the embodiment.

  As shown in FIG. 2, the nozzle device 10 includes a first nozzle part 1 in which a first injection port 11 for primary spraying of the supplied flux liquid is formed, and finally a second flux toward a flux application target. And a second nozzle portion 2 provided with a second injection port 22 for subsequent injection.

  The second nozzle portion 2 includes a cylindrical nozzle body 21 that surrounds the first injection port 11 and has a predetermined inner diameter that extends from the rear to the front of the first injection port 11. A second injection port 22 for injecting the flux liquid is provided at the tip of the.

  The base end opening 20 of the second nozzle portion 2 formed so as to surround the first injection port 11 and the second injection port 22 are both formed in a circular shape having the same diameter, and the inside of the nozzle body 21 A parallel flow forming passage 4 that communicates the base end opening 20 and the second injection port 22 is formed. In addition, the tip outer peripheral surface of the nozzle body 21 is formed in a taper shape with the second injection port 22 as a top for facilitating the sag of the flux injected from the second injection port 22.

  An intake port 23 through which outside air is drawn into the nozzle body 21 as the flux liquid is sprayed from the first injection port 11 is formed at the peripheral edge of the proximal end opening 20 of the second nozzle unit 2. .

  As will be described in detail later, the air that is the outside air sucked from the intake port 23 forms a parallel flow along the inner wall in the parallel flow forming passage 4 in the nozzle body 21, and the first nozzle The flux liquid sprayed into the parallel flow forming passage 4 from the first injection port 11 of the part 1 can also be injected in a parallel flow from the second injection port 22.

  By the way, as for the nozzle apparatus 10 which concerns on this embodiment, the 1st nozzle part 1 and the 2nd nozzle part 2 are comprised separately. In other words, the second nozzle part 2 configured in a cap shape is detachable from the first nozzle part 1 connected in communication with a flux liquid supply device (not shown).

  The second nozzle portion 2 is provided with a connecting portion 24 that allows the second nozzle portion 2 to be detachably attached to the first nozzle portion 1.

  The connecting portion 24 is formed of a cylindrical body, and is attached so that the connecting portion 24 is brought into contact with the outer periphery of the first nozzle portion 1 as shown in FIG. That is, the connecting portion 24 has an inner diameter that allows the outer peripheral surface of the first nozzle portion 1 to be fitted thereto, and a plurality of fixing screws 3 are attached at regular intervals in the circumferential direction.

  Thus, the second nozzle portion 2 can be firmly connected and fixed to the first nozzle portion 1 by tightening the fixing screw 3 after being fitted to the first nozzle portion 1. In the present embodiment, the second nozzle portion 2 is fixed to the first nozzle portion 1 with the three fixing screws 3. However, the number of the fixing screws 3 can be set as appropriate.

  Further, in the middle of the connecting portion 24 made of a cylindrical body, an outside air communication port 25 communicating with the air inlet 23 formed in the peripheral portion of the base end opening 20 in the nozzle body 21 is formed. The outside air communication port 25 may have an opening area, an opening shape, or the like as appropriate, but may be provided so as to be positioned below the intake port 23 provided in the second nozzle portion 2 in the height direction. . In the 2nd nozzle part 2 which concerns on this embodiment, it is provided so that the two external air communication ports 25 may oppose a slightly upper position rather than the screw hole (not shown) for inserting the fixed screw 3. FIG.

  Since the outside air communication port 25 is formed, even if the second nozzle unit 2 and the first nozzle unit 1 are connected so as to be in close contact with each other, the outside air is provided to the intake port 23 provided in the second nozzle unit 2. Can be introduced.

  Further, as described above, the second nozzle portion 2 formed in a cap shape is provided with a flange portion 26 having an outer diameter that is approximately twice the outer diameter of the connecting portion 24 in the middle thereof.

  The collar portion 26 has a surface perpendicular to the axis of the second nozzle portion 2, that is, a horizontal surface, and is ejected upward from the second ejection port 22 in the flux application operation, and then the printed circuit board 200. You can catch the flux that bounces off and falls. And if a flux solidifies by the appropriate thickness on the collar part 26, what is necessary is just to remove collectively.

  Although it is conceivable that the surface of the flange portion 26 is given a gradient and the received flux is allowed to flow downward, the flux is actually viscous, so if the gradient is given to the flange portion 26, the flux will be smooth. However, it will solidify with a half-pitch thickness, and the cleaning efficiency will be lost.

  Therefore, in the nozzle device 10 according to the present embodiment, the collar portion 26 is intentionally set to be a horizontal plane. Of course, a slight gradient is allowed and may be substantially horizontal.

  The aforementioned connecting portion 24 has a base end (upper end in FIG. 2) connected to the flange portion 26, and a distal end (lower end in FIG. 2) extending downward. The dimensions of the connecting portion 24 are set according to the size and shape of the first nozzle portion 1, and when the first nozzle portion 1 is fitted in a stable state, the second nozzle portion 2 (nozzle What is necessary is just to make it the 1st injection port 11 of the 1st nozzle part 1 face the base end of the main body 21) reliably.

  On the other hand, the dimension of the collar part 26 is approximately twice the outer diameter of the coupling part 24, that is, the ratio of the diameter of the coupling part 24 made of a cylindrical body to the diameter of the collar part 26 is 1: 2. Is set from the viewpoint of making it possible to prevent the falling flux from entering the outside air communication port 25 provided in the connecting portion 24 as much as possible.

  Here, with reference to FIG. 3A and FIG. 3B, a case where the flux is actually sprayed onto the printed circuit board 200 and the flux is applied to the through holes 201, 202, and 203 provided in the printed circuit board 200 will be described.

  FIG. 3A is an explanatory view showing a state in which flux is injected using the nozzle device 10 according to the present embodiment, and FIG. 3B is an explanatory view showing a state in which flux is injected using a conventional nozzle device as a comparative example. is there. Note that, as shown in the drawing, a mounting product 220 that does not like the adhesion of flux is attached to the flux application surface of the printed circuit board 200, and the through holes 201, 202, and 203 have these mounting products 220 and 220. It is assumed that it is formed in a narrow area between.

  First, the case where the conventional nozzle device of FIG. 3B is used will be described. In this case, as shown in the drawing, in order to avoid the flux being sprayed onto the mounted product 220, the spray port 400 is sprayed close to the printed circuit board 200. However, as indicated by the arrow f2, it can be seen that the flux liquid is still diffused and is in a state of spreading forward.

  Therefore, the flux liquid enters the left and right through holes 201 and 203 obliquely at a predetermined angle, regardless of the through hole 202 located at the center among the three through holes 201, 202 and 203.

  This increases the possibility that a state in which the flux liquid is not sufficiently applied to the inner walls of the left and right through-holes 201 and 203, particularly the inner wall on the injection port 400 side, will occur. That is, there is a risk of causing poor flux application and consequently poor soldering.

  On the other hand, when the flux is ejected using the nozzle device 10 according to the present embodiment, the flux liquid is ejected in a parallel flow from the second ejection port 22 as shown in FIG. 3A (see arrow f1).

  As shown in the figure, when the flux liquid is sprayed vigorously from the first injection port 11 of the first nozzle unit 1 inside the nozzle body 21 of the second nozzle unit 2, the first injection port 11. A negative pressure is generated behind the.

  As a result, outside air is drawn into the parallel flow forming passage 4 of the nozzle body 21 from the intake port 23, and as shown by an arrow A, a parallel flow along the inner wall is formed to form an air wall as if an air curtain. While being injected from the second injection port 22.

  Therefore, the flux liquid sprayed from the first injection port 11 is suppressed from being diffused by the air wall, and is injected from the second injection port 22 in a substantially parallel state as indicated by the arrow f1. become.

  Therefore, the application width of the flux liquid can be suppressed, and even in a narrow region formed between the mounting products 220, the flux can be applied to the extent that the flux is not attached to the mounting products 220.

  Since the flux liquid sprayed in parallel flow into such a narrow area enters substantially straightly into each of the three through holes 201 to 203, the flux liquid can be applied evenly and reliably to the entire inner wall. Can be done.

  In the nozzle device 10 according to the present embodiment, four intake ports 23 are formed at equal intervals on the base end periphery of the nozzle body 21. However, the number of the intake ports 23, the opening shape, the opening area, and the like are experimental. It can be set appropriately according to the above.

  As described above, since the flux is jetted as a parallel flow by using the flux spray device 100 including the nozzle device 10 according to the present embodiment, masking is not used even in a narrow region. Can apply flux.

  In addition, an even and sufficient amount of flux can be applied to the inner walls of the through holes 201 to 203 arranged in parallel in such a narrow region.

(Modification)
Next, the nozzle device 10 according to a modification will be described. FIG. 4 is an explanatory diagram of the nozzle device 10 according to the first modification. In addition, about the code | symbol attached | subjected to a component, the same code | symbol is used for the same component as the nozzle apparatus 10 shown in FIG. 2, and detailed description is abbreviate | omitted.

  The nozzle device 10 according to the modified example is different from the nozzle device 10 shown in FIG. 2 in that the shape of the intake port 23 and the angle of the cut end of the intake port 23 with respect to the nozzle body 21 are changed and indicated by an arrow A1 In this way, the sucked air is ejected spirally along the inner wall of the parallel flow forming passage 4.

  With such a configuration, it is easy to form an air wall that functions like a so-called air curtain, and it can be expected that the flux is easily injected as a parallel flow.

  FIG. 5 is an explanatory diagram of the nozzle device 10 according to the second modification. In the nozzle device 10 according to the second modification, the peripheral edge portion of the flange portion 26 is extended downward to a position that covers the outside air communication port 25.

  With this configuration, it is possible to more reliably prevent the falling flux from entering the outside air communication port 25.

(Other embodiments)
Next, a nozzle device 50 according to another embodiment will be described with reference to FIG. FIG. 6 is an explanatory diagram of a nozzle device 50 according to another embodiment.

  In the nozzle device 10 according to the above-described embodiment, the first nozzle unit 1 and the second nozzle unit 2 are configured separately, but here, the first nozzle unit 1 and the second nozzle unit 2 include It is provided integrally.

  That is, as shown in the drawing, the midway portion forming the distal end side of the first nozzle portion 1 and the proximal end portion of the second nozzle portion 2 are integrally connected without requiring a fixing screw 3 or the like. Yes. The form in which the first nozzle part 1 and the second nozzle part 2 are connected is not particularly limited. For example, the second nozzle part 2 may be screwed to the first nozzle part 1. Even in such a configuration, the flux liquid is jetted in a parallel flow from the second jet port 22 as shown by the arrow f1, as in the nozzle device 10 according to the previous embodiment.

  Further, it is natural that the nozzle device 50 can be set and used on the base 110 of the flux spray device 100 instead of the nozzle device 10 shown in FIG.

  As mentioned above, although this invention was demonstrated through embodiment, according to the flux spray apparatus 100 using the nozzle apparatuses 10 and 50 which concern on this embodiment, a flux liquid can be sprayed in parallel as much as possible.

  Therefore, the flux liquid can be reliably applied to the inner walls of the through holes 201 to 203, and the quality of soldering performed in the subsequent process can be maintained in a good state.

  By the way, it is desirable to perform surface treatment such as fluorine processing for the nozzle devices 10 and 50 according to the present embodiment. By performing such surface treatment, it becomes easy to remove the adhered flux and the like, and the maintainability is improved.

  Further, the overall shape and dimensions of the nozzle devices 10 and 50 according to the present embodiment can be designed as appropriate.

  In the above-described embodiment, the liquid ejected by the nozzle device 10 is the flux liquid, and the spray device is described as the flux spray device 100. However, the present invention is not limited thereto. The liquid ejected by the nozzle device 10 may be anything, but for example, a paint such as paint can be suitably used.

  Further effects and other modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 1st nozzle part 2 2nd nozzle part 3 Fixed screw 11 1st injection port 22 2nd injection port 23 Intake port 24 Connection part 25 Outside air communication port 26 Gutter part 30 Moving apparatus 100 Flux spray apparatus 110 Base

Claims (8)

A first nozzle part formed with a first injection port for spraying liquid;
The base end is brought into contact with the tapered portion formed on the outer peripheral surface in the vicinity of the first injection port, surrounds the first injection port, and extends from the rear to the front of the first injection port, A cylindrical second nozzle portion provided with a second ejection port for ejecting the liquid at the tip;
Accompanied by spraying of liquid from the first injection port at the base end of the second nozzle part, in a notch shape , and on the side opposite to the injection direction with respect to the position of the first injection port. A nozzle device characterized in that an air intake port through which outside air is drawn is formed. 2. The nozzle device according to claim 1, further comprising a flange portion having a surface perpendicular to an axis of the second nozzle portion in the middle of the second nozzle portion. The first nozzle part and the second nozzle part are separate bodies,
The nozzle device according to claim 1, wherein the second nozzle portion includes a connecting portion that allows the second nozzle portion to be detachably attached to the first nozzle portion. The connecting portion is
A base end is connected to the collar portion, and is a cylindrical body that can be attached to the outer periphery of the first nozzle portion,
The nozzle device according to claim 3, wherein an outside air communication port communicating with the intake port is formed in the middle of the cylindrical body. 5. The nozzle device according to claim 4, wherein a ratio of a diameter of a cylindrical body constituting the connecting portion and a diameter of the flange portion is 1: 2. The nozzle device according to claim 1, wherein the first nozzle portion and the second nozzle portion are integrally provided. A nozzle device according to any one of claims 1 to 6,
A base for setting the nozzle device with the second jet port facing upward;
A spray device comprising: a moving device that drives the nozzle device in a horizontally movable manner together with the base. A first nozzle part formed with a first injection port for spraying liquid;
A second nozzle portion provided with a second jet port for jetting the liquid sprayed from the first jet port,
The second nozzle part is
A cylindrical nozzle body having one end abutting a tapered portion formed on the outer peripheral surface near the first injection port and surrounding the first injection port, the other end being connected to the second injection port;
At the base end of the nozzle body, a notch is provided on the side opposite to the ejection direction with respect to the position of the first ejection port, and the liquid sprays from the first ejection port. An intake port through which outside air is drawn into the nozzle body,
A connecting portion that can be detachably attached to the first nozzle portion;
An outside air communication port that is formed in the connecting portion and introduces outside air into the intake port;
A nozzle device comprising: a flange portion that prevents liquid that is sprayed and dropped from the second ejection port from entering the outside air communication port.

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