JP2509958B2 - Flux spray coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a flux spray coating apparatus which is incorporated in an automatic soldering line to perform flux coating on a work by a spray method. .

(Prior Art) As disclosed in JP-A-61-293663 and JP-A-61-111668, the mesh drum is partially immersed in the flux contained in the tank body, and the mesh drum is rotated. As a result, a flux film is formed on the peripheral surface of the mesh drum, air is jetted from the air jet nozzle provided inside the mesh drum to the flux film, and flux is emitted from the mesh drum toward the external work. There is a flux spray coating device that sprays. The air spray nozzle is attached to the upper side of a fixed air pipe, and the air supplied from the air pipe is jetted right above the nozzle, and the flux is sprayed right above.

(Problems to be Solved by the Invention) As described above, in the related art, since the flux is always sprayed right above, the flux is jetted onto the work from between the works and drops onto the upper surface of the work.

However, since the work is soldered on the bottom surface,
Flux must be applied only to the bottom surface of the work.

An object of the present invention is to prevent the flux from dropping on the upper surface of a work by giving a swinging motion to the air injection nozzle.

[Structure of Invention]

(Means for Solving the Problems) In the present invention, the mesh drum 22 is partially immersed in the flux 21, and the mesh drum 22 is rotated to form a flux film on the peripheral surface of the mesh drum 22. In the flux spray coating device in which air is jetted from the air jet nozzle 17 provided inside the mesh drum 22 to the flux film and the flux is sprayed from the mesh drum 22 toward the external work W, Air pipe 14 or 15 that supplies air to the nozzle 17
Is provided rotatably with respect to the fixed support member 12, and a swinging mechanism 31 for swinging the air injection nozzle 17 around the air pipes 14 and 15 is provided to the air pipes 14 or 15. The swing mechanism 31 has a swing angle adjustment mechanism that variably adjusts the swing angle of the nozzle 17.

(Operation) According to the present invention, when the work W is carried onto the air injection nozzle 17, the air injection nozzle 17 is tilted toward the front of the work W, and the nozzle 17 is advanced as the work W advances. Performs a swinging motion in the direction opposite to the work advancing direction, and when the work is carried out from the air injection nozzle 17, the air injection nozzle 17 is inclined rearward of the work. As a result, the flux sprayed from the mesh drum 22 to the upper side of the work W by the air sprayed from the nozzle 17 is always sprayed to the side opposite to the work, and therefore does not drop onto the work W. Further, when the work size is changed and the length of the work W in the traveling direction increases, the swing angle of the nozzle 17 is also adjusted to increase.

(Example) Hereinafter, the present invention will be described in detail with reference to the examples shown in the drawings.

As shown in FIGS. 1 and 2, a pair of fixed support members 12 are provided inside the tank body 11, and the fixed support members 12 on both sides of the fixed support members 12 are integrally provided at both ends of a cylindrical air tank 13. The air pipes 14 and 15 are rotatably fitted. The pipe 14 on one side is bent so that the air supply port 16 is opened upward, and the pipe 15 on the other side is closed.
A large number of air injection nozzles 17 are provided in a row above the air tank 13.

Further, the disks 14 and 15 on both sides of the air tank 13 are rotatably fitted to the disks 23 and 24 at both ends of the mesh drum 22 which is partially immersed in the flux 21 accommodated in the tank body 11. There is. The mesh drum 22 is a mesh formed in a cylindrical shape, and via a gear 25 screwed to one disc 24 and a gear 26 meshing with the gear 25,
It is rotated in the same direction as the work by a motor 27 attached to the tank body 11. A flux film is formed on the peripheral surface of the mesh drum 22 by this rotation.

Then, the air pressurized and supplied into the air tank 13 from the air pipe 14 connected to the one end surface of the air tank 13 is jetted from the air jet nozzle 17 to the flux film on the upper surface of the mesh drum 22, and from the mesh drum 22. Flux is sprayed upwards.

In such a flux spray coating apparatus, as shown in FIGS. 1 to 3, the air tank 13 is rotated about the air pipes 14 and 15 to swing the air spray nozzle 17 to swing. Mechanism 31 has an air pipe on one side
It is provided for 14.

That is, a cylinder fitting groove 33 is provided in a mounting plate portion 32 integrated with the tank body 11, and a mounting flange 35 of an air cylinder 34 fitted in the fitting groove 33 is provided in the mounting plate portion 32. A pin 38 attached to the tip of the piston rod 37 of this air cylinder 34 is screwed into the vertical elongated hole 36.
Is a lever 39 welded to the air pipe 14 on the one side.
It is slidably fitted in the vertical groove 40 of.

By this swinging mechanism 31, the cylinder fitting groove 33, the long hole 36 and the vertical groove 40 are provided in the vertical direction, and the air cylinder
The mechanism in which 34 can be vertically moved and adjusted is a swing angle adjusting mechanism for variably adjusting the swing angle of the nozzle 17 according to the length dimension of the workpiece (printed wiring board) W in the traveling direction. I am configuring.

That is, even if the piston stroke of the air cylinder 34 is always the same, when the mounting position of the air cylinder 34 is moved upward, the pin 38 is also positioned above the lever 39,
The swing angle of the lever 39 becomes relatively small, and the nozzle 17
The swing angle of is also smaller. Further, when the mounting position of the air cylinder 34 is moved downward, the pin 38 is also moved to the lower part of the lever 39, so that the swing angle of the lever 39 is expanded for the same piston stroke, and the swinging angle of the nozzle 17 is also large. Become.

Therefore, when the length dimension of the work W in the advancing direction is small, the cylinder 34 is moved upward to adjust the swinging angle of the nozzle 17, and when the length dimension of the work W in the advancing direction is large. Adjusts the cylinder 34 downward to increase the swinging angle of the nozzle 17.

Next, the swinging motion of the air spray nozzle 17 will be described. As shown in FIG. 4, (A) when the work W is carried onto the air injection nozzle 17, the work W
The air injection nozzle 17 is inclined toward the front,
(B) Then, as the work W advances, the nozzle 17 makes a swinging motion in a direction opposite to the work advancing direction, and sprays the flux 21a sprayed on the lower surface of the work. When the air jet nozzle 17 is carried out from above the jet nozzle 17, the air jet nozzle 17 is inclined rearward of the work. After that, the nozzle 17 immediately returns to the state of (A) to deal with the next work.

In this way, the flux 21a sprayed from the mesh drum 22 to the upper side of the work W by the air jetted from the nozzle 17 always jets to the side opposite to the work W, and therefore does not drop onto the work W.

In FIG. 4, when the length of the workpiece W is short, the tip of the workpiece is rushed into or the trailing edge of the workpiece is withdrawn from the spray flux 21a in the stage (B), and the spray flux 21a is sprayed on the workpiece W as it is. Since there is a risk that the flux will fall onto the upper surface of the work, in such a case, as described above, the mounting position of the air cylinder 34 is moved upward, and the swing angle of the nozzle 17 is also reduced.

The swing angle adjusting mechanism for the air injection nozzle 17 is not limited to the one for variably adjusting the positional relationship between the actuator (cylinder 34) and the movable fulcrum (air pipe 14) shown in FIGS. As shown in FIG. 5 (second embodiment) and FIG. 6 (third embodiment), the stroke of the nozzle swing-like actuator itself is variably adjusted by a stopper, and further, FIG. As shown in the fourth embodiment, there is a high-class model or the like that controls the motor to swing the head up to an arbitrary angle.

In the second embodiment shown in FIG. 5, the elongated hole 53 of the cylinder shaft support member 52 is fixed to the mounting plate 51 fixed to the tank body 11 with the screw 54, and the shaft support member 52 is fixed with the pin 55. The base end of the air cylinder 56 is rotatably supported and
A tip end of a piston rod 57 of 56 is pivotally attached to a lever 58 protruding from the air pipe 14 by a pin 59. A stopper 61 is movably fitted to the piston rod 57 and fixed by a screw 62. Then, by loosening the screw 62 and moving and adjusting the stopper 61, the reciprocating stroke of the piston rod 57 is changed and adjusted. At that time, since the neutral point of the stroke shifts, the screw 54 is loosened and the cylinder 56 itself is also moved and adjusted in the left-right direction in this figure.

The third embodiment shown in FIG. 6 corresponds to the case where the air pipe 15 (FIG. 1) is rotated by the rotary rear quater, and the actuator body 71 fixed to the tank body 11 has a C-shape. The long hole 73 of the locking plate 72 is fixed by a screw 74, and the long hole 77 of the stopper 76 is fixed by a screw 75 to one end of the C-shaped locking plate 72. Further, the lever 79 integrally fitted to the drive shaft 78 of the rotary actuator (the air pipe 15 is connected to the opposite end of the shaft 78) is engaged by the stopper 76 and the opposite end of the locking plate 72. Be stopped. Then, by loosening the screw 75 and moving the stopper 76 in the circumferential direction, the swing angle of the lever 79 (= the swinging angle of the air injection nozzle) is variably adjusted. At that time, since the neutral point of the lever swing angle is displaced, the screw 74 is loosened and the C-shaped locking plate 72 is also moved and adjusted in the circumferential direction.

The fourth embodiment shown in FIG. 7 has a pair of sensors 81, 82.
The length dimension of the workpiece W is detected by the microcomputer 83, the information is processed by the microcomputer 83, and the amplifier is output by the microcomputer output.
The reversible motor 85 is controlled via 84, the amount of rotation given to the air pipe 14 or 15 via the gears 86, 87 is automatically changed and controlled according to the work length, and an appropriate swinging angle of the nozzle 17 is obtained. .

〔The invention's effect〕

According to the present invention, an air pipe for supplying air to the air injection nozzle is rotatably provided with respect to the fixed support member, and a swing mechanism for swinging the air injection nozzle around the air pipe is provided with respect to the air pipe. By providing the air injection nozzle with a swinging motion in the direction opposite to the work, the flux sprayed on the upper side of the work can be prevented from falling onto the upper surface of the work. Further, since the swinging angle adjusting mechanism allows the swinging angle of the nozzle to be freely variably adjusted, there is an advantage that it is possible to deal with a change in the length dimension of the workpiece in the traveling direction.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the flux spray coating device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view showing an example of a nozzle swing angle adjusting mechanism thereof, and FIG. Explanatory view showing the action of the swinging motion of the nozzle, FIG. 5 is a sectional view showing a modification of the nozzle swinging angle adjusting mechanism, and FIG. 6 is a front view showing another modification of the nozzle swinging angle adjusting mechanism. ,
FIG. 7 is a circuit diagram showing still another modified example of the nozzle swing angle adjusting mechanism. W: Work (printed wiring board), 12: Fixed support member, 14, 15: Air pipe, 17: Air injection nozzle, 21
...... Flux, 22 …… Mesh drum, 31 …… Swing mechanism.

Claims (1)

(57) [Claims] 1. A flux drum is formed on the peripheral surface of the mesh drum by partially immersing the flux drum in the flux and rotating the mesh drum. The flux film is provided inside the mesh drum. In a flux spray coating device in which air is jetted from an air jet nozzle and flux is sprayed from a mesh drum to an external work, an air pipe for supplying air to the air jet nozzle is rotatable with respect to a fixed support member. A swing mechanism for swinging the air injection nozzle around this air pipe is provided for the air pipe, and this swing mechanism includes a swing angle adjusting mechanism for variably adjusting the swing angle of the nozzle. A flux spray coating device characterized by having.