JPS63143971A - Needle with attachment for liquid coating - Google Patents

Abstract

PURPOSE:To coat a liquid of low viscosity uniformly, quickly and widely, by mounting an attachment having a liquid penetrating section in a main body of a capillary-shaped needle removably and watertightly, and also fixing the same on a liquid discharge section through a mounting cap. CONSTITUTION:A mounting cap 20 is fixed to one end of a capillary-shaped metal 18 and mounted on a liquid discharge section 14 removably and watertightly by screw bonding or the like. On the other hand, a tied fiber material or the like with a recessed section 22 fitted into a liquid discharge section 21 of the needle 18 is provided as a material 24 for liquid penetration, and said material 24 for liquid penetration is inserted into one end of a tube-shaped body 26, while an attachment 30 constituted with a packing 28 of rubber or the like provided inside of the other end of the tube-shaped body 26 is mounted watertightly on the main body of the needle 18. By said arrangement, the liquid 2 in a syringe 6 of a liquid discharge device 16 can be discharged widely and uniformly out of the needle 18 and a material 28 for liquid penetration by pressurized gas 12 flowing through a gas piping 8 and a pressure regulating valve 10.

Description

Detailed Description of the Invention (Technical Field to Which the Invention Pertains) The present invention relates to a thin tubular needle as an accessory material used in a coating device that applies a liquid, more specifically a low viscosity liquid, uniformly and widely to a coating surface. It is related to.

This type of coating device is desired to have a simple structure and good workability.

(Prior art) As for this type of liquid application work, conventionally, as in general painting work, first, an applicator such as a brush or sponge roller is placed in a container containing the liquid, and the liquid is soaked into the container. The liquid was applied to the surface using an applicator. In addition, as method B, a syringe (ayrlng), which is a cylindrical container, is used.
o ), attach a thin tubular needle to the liquid discharge part of the syringe, control the flow rate of the liquid in the syringe by pressurizing it and the internal resistance of the needle, and discharge a fixed amount of liquid from the tip of the needle. There is a coating device that coats a coating surface with a discharged liquid.

(Problems to be Solved by the Invention) In the work performed by method A, the application work is interrupted during the reciprocating of the applicator to the container, which has the disadvantage that the work takes time as a whole and uneven application occurs. others,
The drawback was that it was difficult to automate the work.

In addition, when the liquid is easily volatile, there are problems such as unnecessary volatilization of the liquid, waste of liquid, and environmental degradation.

When using the applicator B, the trouble of moving the applicator back and forth to the container as described above can be saved, and automation can be implemented.
Since the liquid ejected from the needle is linear and does not spread well, the applied surface tends to be applied in a linear manner, which has the disadvantage that it is not possible to uniformly apply the liquid over a wide area.

Furthermore, application by spraying is also possible, but there are problems such as excess spray floating in the environment, waste of liquid, and environmental deterioration.Although automation is being implemented, it is difficult to solve the problem of environmental deterioration by installing booths and exhaust treatment equipment. The disadvantage was that it required capital investment.

The present invention is applicable to coating operations using the conventional techniques described above, such as applying liquid in a container to an applicator, applying using an applicator with a thin tubular needle attached to a syringe, and applying by spraying. This problem can be solved and the liquid can be applied quickly and uniformly to the application surface.
Moreover, it is an object of the present invention to provide a needle with a liquid coating attachment for a coating device that can automate the work.

(Means for Solving the Problems) The present invention has a cap for attachment fixed to one end of a thin tube-shaped needle, and a main body having a liquid-permeable material such as a bundle of fibers, felt or sponge. The attached accessory is removably and liquid-tightly attached to the liquid ejection part of a liquid ejection device such as a syringe using the attachment cap.

(Function) A fixed amount of liquid can be discharged by controlling the flow rate of the liquid in the syringe by applying pressure and the resistance inside the needle tube, and the liquid discharged from the tip of the needle is expanded to a width larger than the inner diameter of the needle tube by the attachment. The coating process can be easily automated so that the liquid can be applied uniformly to the coating surface.

(Embodiment of the Invention) FIG. 1 is an assembled cross-sectional view showing a first embodiment of the present invention, and is a view showing a coating device to which a needle with an appendage for applying liquid of the present invention is attached.

The present invention uses a syringe, which is a cylindrical container, to apply the liquid 2 uniformly and quickly to the application surface 4.
inge) 6 and gas piping 8. The liquid 2 is pressurized by a pressurized gas 12 introduced through a pressure regulating valve 10 that can be adjusted to a desired pressure, and is discharged from a liquid discharge section 14, thereby forming a liquid discharge device 16, which 1
4 is attached with a needle with an appendage for liquid application of the present invention.

A mounting cap 20 is fixed to one end of the thin tube-shaped needle 18, and this is attached to the liquid discharge portion 14 in a liquid-tight manner so as to be freely attachable and detachable by a screw connection shown in the figure or a taper fit not shown.

A fibrous body provided with four parts 22 that fit into the liquid discharge part 21 of the needle 18 is bundled to form a liquid permeate 24, and the permeate 24 is inserted and attached to one end of the tubular body 26, and the other end of the tubular body is attached. An appendage 30 is constructed by providing a gasket 28 made of an elastic material such as rubber that has an elastic tightness with respect to the main body of the needle 18 on the inner surface of the needle 18. Attach tightly and removably. The liquid 2 in the syringe 6 is transferred by the liquid discharge device 16 to the gas pipe 8. Pressurized gas 12 flows in through a pressure regulating valve 10 that can be adjusted to a desired pressure.
The needle 1 is pressurized by and discharged from the liquid discharge part 14, and is attached to the liquid discharge part 14 with an attachment pipe 20.
8.

A desired amount of liquid 2 is discharged at a constant rate by controlling the flow rate by applying pressure that can adjust the liquid 2 in the syringe 6 to a desired pressure and the resistance in the tube of the needle 18, and then discharging it from the liquid discharge part at the tip of the needle 18. The liquid 2 is expanded widely to a size larger than the inner diameter of the needle tube by the appendage 30 provided with the penetrant 24, thereby achieving the effect that the liquid 2 can be applied uniformly and quickly to the application surface 4.

In the second embodiment of the present invention, the penetrant 24 is replaced with one made of felt or sponge. The same effects as described above can be obtained in the third embodiment as well.

The application method carried out using a liquid application device using a liquid application needle of Hontsu '13 Mei is to apply the liquid by manually moving the device to the stationary application surface 4. Alternatively, the liquid may be applied by moving the application device by an automated device attached to a robot hand. On the other hand, the liquid may be applied by moving the application surface 4 manually or by a robot to a stationary application device.Next, the liquid 2 is pressurized to a desired pressure and the inside of the needle 18 is applied. The principle of controlling the flow rate using resistance and discharging a desired amount of liquid 2 will be explained.

The Hagen-Poiseuille law is a law for the laminar flow of fluid in a circular pipe.
illa 1ovr).

#: Water head loss due to friction, pressure at the inlet and outlet of the pipe is P
L, ρ2) r is the weight of the unit volume of liquid, μ is the viscosity coefficient,
This law is expressed by the following equation, where l is the length of the tube, d is the inner diameter of the tube, Q is the flow rate, and υ is the average flow velocity.

If the appendage 30 does not change, the pressure at the outlet of the needle 18, that is, the pressure at the outlet of the tube, p2, will not change, and if the liquid 2 is determined, the viscosity coefficient m and the weight of unit volume γ will not change, and t and d of the needle 18 will also remain constant. Since the value is QOCρ1, the flow ff1Q increases or decreases in proportion to the pressurization p1 that can be adjusted to the desired pressure of the liquid 2, and the flow rate is controlled by the pressurization that can be adjusted to the desired pressure of the liquid and the resistance in the pipe to obtain the desired value. A fixed amount of liquid can be discharged.

A plurality of needles 18 having different pipe inner diameters d and lengths l, and therefore different values of resistance inside the pipes, are prepared, and the needles 18 are prepared according to the properties of the liquid 2 to be applied, such as the viscosity coefficient μ, and the working conditions, such as the speed of application. Depending on the situation, select the most suitable needle with an attachment for liquid application from a plurality of needles that are prepared, and easily replace and attach it to the liquid discharge part 14 of the liquid discharge device 16, and apply a low-viscosity liquid to the coating surface. (Effects of the Invention) The present invention provides the effect of applying a liquid permeable material such as a bundle of fibers, felt, or sponge to the main body of a thin tube-shaped needle. The attached accessory is removably attached in a liquid-tight manner, and the attachment cap is fixed to one end of the needle, and the attachment cap is removably attached in a liquid-tight manner to the liquid ejection part of a liquid ejection device such as a syringe. , the liquid in the syringe can be adjusted to the desired pressure using the pressure control valve, and the flow rate can be controlled by the internal resistance of the needle and the liquid can be discharged in a fixed amount. By expanding the liquid to a size larger than the inner diameter of the needle using an appendage, the liquid can be uniformly and quickly applied to the application surface, and the application device can be automated.

If you prepare multiple needles with different inner diameters and lengths,
Liquid properties 9 The most suitable needle is selected according to the working conditions, and it is removably attached to the liquid discharge part of the liquid discharge device in a liquid-tight manner, so the pressure can be freely controlled to cover a wider range of conditions such as application amount. You can get effects that you can choose from.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional assembly view showing an embodiment of the present invention, and is a view showing a coating device equipped with a needle with an appendage for applying liquid according to the present invention. 2: Liquid, 6: Syringe, 14: Liquid discharge part, 16: Liquid discharge device, 18: Needle, 2o: Mounting cap, 22:
Recess, 28 = infiltrate, 3o: appendage. ,...'〕・Yamaguchi Saijin ・＼ζ、Thank you
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Claims (1)

[Scope of Claims] 1) A thin tube-shaped needle that is attached to a liquid discharge part of a liquid discharge device to apply a liquid, with a mounting cap attached to one end of the needle to be detachably attached to the liquid discharge part in a liquid-tight manner. A needle with an attachment for liquid application, characterized in that an attachment attached to the main body by inserting a liquid penetrant into a tubular body can be detachably attached in a liquid-tight manner. 2) A needle with an appendage for applying a liquid according to claim 1, wherein the penetrant provided in the appendage is made of a bundle of fibers. 3) A needle with an appendage for applying a liquid according to claim 1, wherein the penetrant provided in the appendage is made of felt. 4) A needle with an appendage for applying a liquid according to claim 1, wherein the penetrant provided in the appendage is made of a sponge.