JPH01162567A - Flux spray coating device - Google Patents

Abstract

PURPOSE:To uniformize the flux coating density by providing a variable speed motor on the rotary driving system of a mesh drum and arranging the controller variably controlling the rotary speed of the mesh drum. CONSTITUTION:Many sensor sensing parts 51 are provided on the outer peripheral face of one end part disk 23 of a mesh drum 22 and the rotary speed detecting sensor 52 opposing thereto is arranged. The sensor 52 is connected to a computer 54 and the variable speed motor 27 for driving is arranged on the mesh drum 22. When the transfer speed of a work W or the oscillating peripheral speed of an air injection nozzle 17 is changed, the computer 54 automatically operates the rotary speed of the mesh drum 22 corresponding thereto, controlling the rotary speed of the variable speed motor 27. The flux coating density onto the work W is thus uniformized.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a flux spray M coating device that is incorporated into an automatic soldering line and applies flux to a workpiece by a spraying method. It is.

(Prior art) Japanese Unexamined Patent Publication No. 61-293663 and Utility Model Application No. 61-1
As shown in Japanese Patent No. 11668, a mesh drum is partially immersed in flux contained in a tank body, and by rotating this mesh drum, a flux film is formed on the circumferential surface of the mesh drum, and a flux film is formed on the circumferential surface of the mesh drum. There is a flux spray coating device in which air is injected from an air injection nozzle provided inside a mesh drum, and flux is sprayed from the mesh drum toward an external workpiece. A conventional mesh drum is always rotated at a constant rotation speed.

(Problems to be Solved by the Invention) In such a flux jetting W1 coating device, when the workpiece conveyance speed changes, the density of flux applied to the workpiece changes. For example, as the workpiece conveyance speed increases, the flux application density decreases, but it is desirable that the flux application sound intensity is always constant.

An object of the present invention is to maintain a constant 7 lux coating density on a workpiece even when the workpiece conveyance speed or the like is adjusted.

[Structure of the 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 circumferential surface of the mesh drum 22. Mesh drum 2 against the membrane
In the flux spray coating device, air is injected from an air injection nozzle 17 provided inside the mesh drum 22, and flux is sprayed from the mesh drum 22 toward the external workpiece W. is provided, and for this variable speed motor 27,
A controller 53 is connected thereto which variably controls the rotational speed of the mesh drum 22 to keep the flux application density constant.

(Function) In the present invention, when the conveyance speed of the workpiece W is changed to a high value, the rotation speed of the variable speed motor 27 is also controlled to a high value, and the mesh drum 22 is rotated at a higher speed, thereby keeping the flan-x coating density constant. Keep it.

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

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

In addition, disks 23 and 24 at both ends of the mesh drum 22, which are partially immersed in the flux 21 housed in the tank body 11, are attached to the vibrators 14 and 15 on both sides of the air tank 13.
are rotatably fitted. This mesh drum 22
has a mesh formed in a cylindrical shape, and is connected to a variable speed motor ( The drive shaft 28 of the servo motor 27 moves the workpiece (printed wiring board) as shown in FIG.
It is rotated in the same direction as W. Due to this rotation, a flux film is formed on the circumferential surface of the mesh drum 22.

Then, air is pressurized and supplied into the air tank 13 from the air pipe 14 connected to one end surface of the air tank 13, and is injected from the air injection nozzle 17 onto the flux film of the mesh drum 22, and the flux flows upward from the mesh drum 22. Sprayed.

Furthermore, a neck capture mechanism 31 for rotating the air tank 13 around the air pipes 14 and 15 and swinging the air injection nozzle 17 is provided for the air pipe 14 on the negative side.

That is, a cylinder fitting groove 33 is provided in the mounting plate part 32 that is integral with the tank body 11, and a mounting flange 35 of the air cylinder 34 fitted in this fitting groove 33 is provided in the mounting plate part 32. A pin 38, which is screwed into an elongated hole 36 in the vertical direction and provided at the tip of the piston rod 37 of this air cylinder 34, slides into a vertical groove 40 of a lever 39 welded to the air pipe 14 on the negative side. They are fitted freely.

In this swinging mechanism 31, the cylinder fitting groove 33
, a mechanism in which elongated holes 36 and vertical grooves 40 are provided in the vertical direction, and the air cylinder 34 is movable and adjustable in the vertical direction, adjusts the swing angle of the nozzle 17 in the direction of movement of the workpiece (printed wiring board) W. It constitutes a neck shooting angle adjustment mechanism for variable adjustment according to the length dimension.

That is, even if the piston stroke of the air cylinder 34 is always the same, if the mounting position of the air cylinder 34 is moved upward, the pin 38 will also be located at the top of the lever 39, so the swing angle of this lever 39 will be relatively small. becomes smaller,
The neck angle of the nozzle 17 also becomes smaller. 1. ", when the mounting position of the air cylinder 34 is moved downward, the pin 3
8 also moves to the bottom of the lever 39, so this lever 39
The swing angle of increases for the same piston stroke,
The swing angle of the nozzle 17 also increases.

Therefore, if the length of the work W in the advancing direction is small, move the cylinder 34 upward to adjust the nozzle 17.
Also, if the length of the work W in the advancing direction is large, the cylinder 34 is moved downward and the swing angle of the nozzle 17 is increased.

Next, to explain the oscillating motion of the air injection nozzle 17, as shown in FIG.
The air injection nozzle 17 is tilted further forward than (
B) Then, as the workpiece W advances, the nozzle 11 sprays the sprayed flux 21a onto the lower surface of the workpiece while performing a neck shooting motion in the opposite direction to the workpiece progressing direction. When the workpiece is carried out from above the nozzle 17, the air injection nozzle 17 is tilted backward from the workpiece.After this, the nozzle 17 immediately returns to the state f8 (c) and deals with the next workpiece.

In this way, the flux 21a sprayed from the mesh drum 22 above the workpiece W by the air jetted from the nozzle 17 is always jetted to the opposite side of the workpiece W, so that it does not fall onto the workpiece W.

In Fig. 3), the rotational speed V1 of the mesh drum 22,
The transport speed v2 of the workpiece W, the circumferential nozzle swing speed 3 on the mesh drum surface, and the nozzle swing peripheral speed V4 on the workpiece transport surface are shown, respectively.

The flux application density A on the lower surface of the workpiece W is determined from these values as follows: A; (V1+Va)/(V2+V4).

Returning to FIG. 1, a large number of sensor sensing sections 51 are provided on the outer peripheral surface of the disk 23 at a constant pitch, and a drum rotation speed detection sensor 52 is provided for each sensor sensing section 51. When this sensor 52 is a photosensor, a reflecting plate is used as the sensing section 51, and the sensor 52
When is a magnetic sensor, a magnet is used as the sensing section 51.

This drum rotation speed detection sensor 52 is a control device 53.
is connected to the computer 54 of. This computer 54 controls the driving speed of the variable speed motor (servo motor) 27 via an amplifier 55, and controls the driving speed of the mesh drum 22.
By variably controlling the rotational speed (1), the flux coating density is kept constant. This computer 54 stores the drum rotational speed (1) detected by the sensor 52 and the workpiece conveyance speed (2) from the workpiece conveyor.
, the nozzle swing circumferential speed V3. which is related to the driving speed of the air cylinder 34. Respective information regarding V4 is input.

Then, the workpiece conveyance speed V2 or the nozzle neck peripheral speed V3. When V4 is changed, the calculation function of the computer 54 automatically determines the rotational speed V1 of the mesh drum 22 so that the flux application density A remains constant, and controls the drum rotational speed 1 to be jetted. An output is provided from the device 53 to the variable speed motor 27.

For example, if the workpiece conveyor speeds up (workpiece conveyance speed v2 is changed to high), the variable speed motor 27
The rotation speed is also increased, the mesh drum 22 is rotated at a higher speed, and the flux application density is kept constant.

〔Effect of the invention〕

According to the present invention, a variable speed motor is provided in the rotational drive system of the mesh drum, and a black stopper is connected to the variable speed motor to variably control the rotational speed of the mesh drum to keep the flux application density constant. Even if the workpiece conveyance speed or the like is adjusted, the flux application density on the workpiece can always be kept constant by self-helping.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the flux spray coating device of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an explanatory diagram illustrating the swinging motion of the air injection nozzle. W... Work (printed wiring board), 17... Air injection nozzle, 21... Flux, 22... Mesh drum, 27... Variable speed motor, 53... Controller. December 17, 1986 Inventor Teru Okano Jun Ono -

Claims (1)

[Claims] (1) The mesh drum is partially immersed in the flux;
By rotating this mesh drum, a flux film is formed on the circumferential surface of this mesh drum, and air is injected from an air injection nozzle provided inside the mesh drum to this flux film, and the external air is emitted from the mesh drum. In a flux spray coating device that sprays flux toward a workpiece, a variable speed motor is provided in the rotational drive system of the mesh drum, and the rotational speed of the mesh drum is variably controlled by the variable speed motor to apply flux. A flux spray coating device characterized by being connected to a controller that keeps the density constant.