JPH03217268A - Solution applicator - Google Patents

Abstract

PURPOSE:To automatically agitate a soln. to adjust its composition and concn. by providing a check valve to be opened by the resistance of the soln. when a scoop is lowered in the soln. in a tank at the bottom of the scoop. CONSTITUTION:The scoop 6 to be lifted up and down is provided between the tank 1 and a work 3 arranged above the tank. The scoop 6 is dipped in the tank 1 and filled with the soln. 2. The scoop 6 is then raised, hence the work 3 is dipped in the soln. 2 in the scoop 6, and the soln. 2 is supplied on the surface of the work 3. In this case, a check valve 7 to be opened by the resistance of the soln. when the scoop 6 is lowered in the soln. 2 in the tank 1 is provided at the bottom of the scoop 6. As a result, the composition and concn. of the soln. are automatically adjusted by agitation, and the variation in the concn. and composition of the coat and coating area is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Field of Industrial Application) The present invention relates to an apparatus for automatically applying a solution to workpieces such as various parts and products.

(Prior art) When applying a solution to the surface of various parts and products, i.e., workpieces, there are known methods such as brush coating and spray coating, but the easiest method is to dip the workpiece in the solution or apply the solution This method uses a ladle to pump up the solution from inside the tank, and immerses the workpiece in the solution in the ladle so that the solution adheres to the surface. This dipping method is easy to operate and can be carried out using relatively simple equipment.

(Problem to be Solved by the Invention) However, in the above-described dipping method, when the solution components to be coated contain components that tend to precipitate, differences in the concentration of the solution occur between the surface layer, intermediate layer, and bottom layer. Therefore, there is a problem that the quality of the coating solution varies depending on the immersion depth and the consumption condition of the solution.

Also, in the case of the method of pumping up the solution from inside the tank with a ladle as described above, if the ladle is open at the top, only the solution in the upper layer of the tank will be able to enter. In the case of a solution containing a mixture of different coating agents, there will be a difference in composition between the surface layer and the bottom layer, resulting in variations in coating concentration and composition.

The present invention aims to provide a solution coating device in which the components and concentration of the solution are automatically stirred and the coating concentration, components, and coating area are prevented from varying.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a ladle that is driven up and down between a tank containing a solution and a workpiece placed above the tank, and lowers the ladle into the tank. By raising this ladle, the workpiece is immersed in the solution contained in this ladle and applied to the surface of the workpiece, and this ladle is equipped with a check valve at the bottom, and this check valve is It is characterized by being opened by the resistance of the solution when it is lowered through the solution in the tank.

(Function) According to the present invention, when the ladle is lowered and submerged into the tank, the check valve provided at the bottom of the ladle is opened during the process of descending through the solution in the tank, and the solution in the tank is lowered. When entering the anther and raising this ladle, the check valve closes and the solution is stored in the ladle, and this ladle is raised and the workpiece waiting above can be immersed in the solution in this ladle. Therefore, as the ladle descends in the tank, the solution is stirred to equalize the components and concentration, and the liquid level in the ladle remains constant, so by setting the position of the workpiece and the rising position of the ladle constant. The solution can be applied to a predetermined surface of the workpiece.

(Embodiment) An embodiment of the present invention will be described below based on drawings in which the present invention is applied to an apparatus for applying an adhesive made of molten glass to an envelope of a color display.

In the figure, reference numeral 1 denotes a tank, which contains a solution 2, that is, an adhesive made of molten glass in this embodiment.

3 is a color display envelope as a workpiece,
It is suspended by a chuck 5 attached to a conveyor chain 4. The workpiece 3 is transported as the transport chain 4 runs, and when it is sent directly above the tank 1, it is stopped and put on standby.

6 is a ladle, which divides and pumps up the solution 2 in the tank 1.

A check valve 7 is provided at the bottom of the dipper 6. The check valve 7 includes a nozzle 8 fixed to the dipper 6 via a nut 7a, a ball valve 10 for opening and closing the introduction hole 9 of the nozzle 8, and a stop pin 11 for regulating the floating of the ball valve 10. It is configured.

Normally, the ball valve 10 is seated on the conical seat surface of the nozzle 8 due to its own weight and closes the introduction hole 9, thereby preventing the solution 2 contained in the dipper 6 from flowing out. When the dipper 6 is submerged in the tank 1 and lowered through the solution 2, the ball valve 10 is pushed up by the resistance of the solution 2, the conical seat surface is separated, and the introduction hole 9 is opened. Therefore, the solution 2 in the tank 1 flows into the ladle 6 via the nozzle 8.

Note that the stop pin l1 regulates the amount of floating of the ball valve 10.

An arm 12 is fixed to the ladle 6, and the upper end of this arm 12 is attached to a slider 14 via a fixing screw 13.
is connected to.

The slider 14 is attached to a bracket 15. In this case, the mounting position of the slider 14 can be adjusted up and down with respect to the bracket l5 using an adjustment bolt 16.

Bracket 15 is connected to piston rod 18 of air cylinder 17.

Therefore, when the air cylinder 17 is extended,
The ladle 6 is raised via the bracket 15, slider 14 and arm 12.

Although the operating stroke of the air cylinder 17 is constant,
Adjustment bolt 16 for slider 14 relative to bracket 15
By adjusting the vertical position, the rising position of the dipper 6 can be determined.

Reference numeral 20 denotes a stirrer, which includes rotary blades 22 at the lower end of a rotating shaft 21 rotated by a motor (not shown). As this rotor blade 22 is rotated within the tank 1, the tank 1
Stir solution 2 of

The operation of an embodiment of such a configuration will be explained.

When the color display envelope as the workpiece 3 is sent directly above the tank 1 as the conveyor chain 4 travels, the conveyor chain 4 is stopped and the workpiece 3 is put on standby here.

In this state, the air cylinder 17 is extended and the ladle 6 contains the solution 2 in the tank 1 in small portions, and when the ladle 6 starts to rise, as shown in FIG.
The ball valve 10 of the check valve 7 closes to the introduction hole 9 of the nozzle 8 due to its own weight.
Since it is closed, the contained solution 2 is prevented from flowing out, and the liquid level is maintained at the same level as the upper end of the ladle 6.

When the ladle 6 is raised to the highest position, the work 3 waiting at the upper part is placed in the raised ladle 6 and immersed in the solution 2 in the ladle 6. The solution in the ladle 6 is kept at a constant liquid level, and since the volume is small, ripples on the top surface of the ladle 6 are extremely small. Moreover, since the standby position of the workpiece 3 and the raised position of the ladle 6 are fixed, the workpiece 3 is immersed in the solution 2 of the ladle 6 up to a predetermined height. Therefore, the solution 2 adheres to the workpiece 3 up to a predetermined position, that is, it is applied to the predetermined area with high precision.

When such dip coating is performed, the air cylinder 17 is operated to shorten and the ladle 6 is lowered.

In the process of lowering the ladle 6, the workpiece 3 is transferred to the conveyor chain 4.
The next workpiece 3 is sent directly above the tank 1 and is waited there.

When the lowered ladle 6 is immersed in the solution in the tank 1, the ball valve 10 of the check valve 7 provided at the bottom of the ladle 6 is pushed up by the resistance of the solution 2, as shown in FIG.
The introduction hole 9 is opened. Therefore, the solution 2 in the tank 1 flows into the ladle 6 via the nozzle 8.

Therefore, the solution is replenished into the ladle 6.

Therefore, as the air cylinder 17 is extended again, the ladle 6 rises and coats the workpiece 3 with the solution.

This operation is repeated thereafter.

In such an embodiment, when the ladle 6 is lowered into the tank 1, the upper end of the ladle 6 touches the solution 2 in the tank 1.
It was soaked so that it was completely submerged in the water, and then the ladle 6
The solution 2 in the tank 1 is introduced into the tank 1 through a check valve 7 provided at the top opening and the bottom. As a result, the stationary solution remaining inside the ladle 6 is turbulently stirred by the inflow of new liquid. For this reason, dipper 6
Precipitation inside is prevented and the concentration is maintained evenly.

As the ladle 6 is lowered into the tank 1, the solution stored stationary in the tank 1 is also disturbed.
Moreover, the solution in the tank 1 is also stirred by flowing into the ladle 6. Therefore, precipitation of the solution in the tank 1 is prevented and the concentration of the components is made equal.

Furthermore, in the case of this embodiment, the rotary blades 22 of the stirrer 20 driven by a motor (not shown) are rotated within the tank 1 to stir the solution 2 within the tank 1 .

Therefore, the concentration of the solution is kept constant.

Therefore, a solution having a constant component concentration is applied to each workpiece 3 in a predetermined area range, and the quality is stabilized.

Moreover, the above device replaces the ladle 6 with the air cylinder 17.
Since the device is simply moved up and down in conjunction with the operation of the device, the operation is simple and quick, the coating work can be carried out efficiently, and the construction of the device is simple.

Also, if you want to change the application position of the solution, use the adjustment bolt 1.
By adjusting the position of the slider 14 up and down with respect to the bracket 15 using the slider 6, the position of the dipper 6 changes, so the amount of immersion of the workpiece 3 changes, and the coating area can be changed.

In the above embodiment, the solution 2 in the tank 1 is stirred by the stirrer 20, which is effective in keeping the concentration of the solution constant. Since the solutions in the ladle 6 and the tank 1 are both stirred by lowering the stirrer 20, the stirrer 20 is not necessarily required.

Furthermore, in the above embodiment, the workpiece 3 is an envelope of a color display, and the solution 2 is applied to an apparatus that applies an adhesive made of molten glass to the case. It can be carried out only when applying various solutions to various parts and products. Looking around the field of lamp manufacturing in which the present inventors are involved, for example, the filament of a lamp is coated with a getter or an electron-emitting substance.
Various implementations are possible, such as applying solder to wiring and terminal components, and applying coating solution to valves.

[Effects of the Invention] As explained above, according to the present invention, when the ladle is lowered and submerged in the tank, the reverse top valve provided at the bottom of the ladle is opened and the solution in the tank is introduced into the ladle. ,
During this process, the solution is stirred to equalize its components and concentrations. When the ladle is raised, the check valve closes, allowing the solution to be stored at a constant level. By bringing the ladle closer to the workpiece waiting above and immersing the workpiece in the solution, A solution can be applied to a predetermined surface of a workpiece with high precision. Therefore, the components and concentration of the solution are automatically stirred, and there is no variation in the coating surface area, resulting in improved coating performance and quality. Moreover, the device has simple movements, excellent workability, and a simple configuration.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a cross-sectional view showing the entire coating device, and FIGS. 2 and 3 being cross-sectional views of the ladle in different operating states. 1... Tank, 2... Solution, 3... Work, 4...
... Conveyance chain, 6... Ladle, 7... Check valve, 8... Nozzle, 10... Ball valve, 17... Air cylinder. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] This is a device for applying a solution contained in a tank onto the surface of a workpiece, by providing a ladle that is driven up and down between the tank and the workpiece placed above, and lowering the ladle to submerge it in the tank. The solution is applied to the surface of the workpiece by storing the solution and raising the ladle to immerse the workpiece in the solution contained in the ladle.The ladle then descends into the solution in the tank to the bottom of the ladle. A solution application device characterized in that it is provided with a check valve that is opened by the resistance of the solution when the solution is applied.