JP3786483B2 - Method and apparatus for quantitative application of highly viscous substances - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for quantitatively applying a high-viscosity substance to a substrate surface, and more particularly to a method and apparatus suitable for quantitatively applying a high-viscosity substance having no self-fluidity.
[0002]
[Prior art]
For example, a sealant for a window frame or a sealing gasket inserted between an automobile engine and an oil pan discharges the raw liquid thermoplastic resin composition from the discharge nozzle along the outer edge of the window frame or the oil pan. After being applied, it is formed by curing. In this application work, it is necessary to discharge a certain amount of the raw material in accordance with the dimensions of the window frame, etc. without excessive or insufficient. If excessively discharged, the raw material is wasted and the appearance deteriorated. Will come.
[0003]
Conventionally, the raw materials generally used for the above-described coating operation have been used in the state of a viscous liquid having self-fluidity. For this reason, it has been possible to easily apply a predetermined amount of raw material to a predetermined size by simply turning on and off the open / close valve using a discharge nozzle with an open / close valve.
However, as a raw material used in the above-described coating operation, it is not coated in a self-flowing viscous liquid state for the purpose of shortening the curing time, but has a high viscosity and itself is self-flowing. There is an attempt to use it in the state of an ultra-high viscosity liquid that has almost no fluidity. However, there has been a problem that such an ultra-high viscosity liquid that does not have self-fluidity cannot be discharged by a conventional discharge nozzle, and that quantitative discharge is almost impossible.
[0004]
The ultra-high viscosity substance as described above can be extruded when a high pressure is applied by a high-pressure extruder such as a hydraulic extruder. However, the high-pressure extruder as described above requires a pressure-resistant structure for the pressure chamber, so that the entire apparatus becomes large, and when a high-viscosity material is extruded at a high pressure, the discharge can be stopped instantaneously. Since there is no valve, there is a problem that an increase in the size of the apparatus cannot be avoided.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a high-viscosity substance quantitative application method and apparatus capable of accurately applying a high-viscosity substance only quantitatively while reducing the size and weight of the apparatus.
[0006]
[Means for Solving the Problems]
The method for quantitatively applying a highly viscous substance of the present invention that achieves the above object is provided with an intake port and a discharge port for a highly viscous substance at the end of a cylinder inserted so as to reciprocate a plunger. The cylinder holder is provided with a supply port for a highly viscous substance and a discharge port communicating with the discharge nozzle. The supply port for the cylinder holder and the cylinder A plunger extruder configured to be able to alternately switch communication between the inlet and communication between the discharge port of the cylinder holder and the discharge port of the cylinder by rotation of the cylinder , and the cylinder of the plunger extruder After the high-viscosity substance is once stored in a fixed amount, it is applied to the surface to be coated from the plunger extruder.
[0007]
Using the plunger extruder configured to alternately open and close the intake port and the discharge port for the high-viscosity material as described above, the high-viscosity material is temporarily stored in the cylinder in an amount necessary for one cycle of application. Is discharged and applied, so that the apparatus configuration for applying the highly viscous substance can be reduced in size and weight. In particular, since the plunger extruder has a stable thrust and can easily control the stroke speed, it is possible to apply a highly viscous substance with high accuracy.
[0008]
In addition, the high-viscosity substance quantitative application device of the present invention that achieves the above object is provided with a high-viscosity substance inlet and outlet at the end of a cylinder inserted so as to reciprocate a plunger. The cylinder holder is rotatably held around a cylinder shaft, and the cylinder holder is provided with a supply port for a highly viscous substance and a discharge port communicating with the discharge nozzle. The supply port of the cylinder holder and the cylinder The communication with the intake port and the communication between the discharge port of the cylinder holder and the discharge port of the cylinder can be alternately switched by the rotation of the cylinder.
[0009]
As described above, since the intake and outlet of the cylinder are opened and closed based on the rotation of the cylinder, it is possible to configure a small, lightweight and highly airtight valve mechanism for a highly viscous substance. Therefore, according to such a coating apparatus, it is possible to carry out the above-described method for coating a highly viscous substance.
In the present invention, the high-viscosity substance has a viscosity of 1 × 10 ⁶ or more at 25 ° C., usually 5 × 10 ⁷ to 2 × 10 ⁹ centipoise, and a plasticity specified in JIS-C2123 is 0.7 mm. This is the substance having fluidity when stress is applied. Examples of such high-viscosity substances include silicone rubber compositions (which are uncured silicone rubbers and cured to silicone rubbers) mainly composed of organopolysiloxane raw rubber and silica fine powder and other inorganic fillers and curing agents. Composition). The coating method and the coating apparatus of the present invention can obtain a remarkable effect when applying a highly viscous substance in the above viscosity range.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an example of a high-viscosity substance coating apparatus of the present invention. In the figure, the plunger pusher P is separated from the material supply portion S as shown in FIG. 2 with the position connected to the material supply portion S formed of a hydraulic extruder or the like as shown in FIG. It is comprised so that it can move to the position where the to-be-coated surface which performs application | coating operation | work is placed.
[0011]
The cylinder 1 is provided with an intake port 1a for a highly viscous substance on the side surface in the vicinity of the bottom, and a discharge port 1b at a position eccentric from the center at the bottom. A plunger 2 is inserted into the cylinder 1, and the plunger 2 can be slid up and down in the cylinder 1 by driving a ball screw (not shown). A piston ring is fitted to the tip of the plunger 2 so as to ensure airtightness in the cylinder 1. The cylinder 1 is held by a cylindrical cylinder holder 3 and is reciprocally rotated around an axis by a rotary driving device 4 via an arm 1m fixed to the upper part of the cylinder 1.
[0012]
The cylinder holder 3 is provided with a supply port 3a at a position corresponding to the intake port 1a of the cylinder 1, and a shielding plate 5 for opening and closing the discharge port of the cylinder 1 is bolted to the lower end thereof. As shown in FIG. 3, the shielding plate 5 is provided with a discharge port 5 a that opens at a position where the upper surface side is eccentric so as to correspond to the discharge port 1 b of the cylinder 1 and opens at the lower surface side. Yes.
[0013]
The cylinder 1 is driven to the left and right by the rotation driving device 4 so that the intake port 1a is switched between a position where the intake port 1a communicates with the supply port 3a of the cylinder holder 3 and a position where the intake port 1a is closed. The screen is switched between a position communicating with the discharge port 5a of the shielding plate 5 and a position closing. Moreover, when the intake port 1a communicates with the supply port 3a, the discharge port 1b is closed with respect to the discharge port 5a. Conversely, when the intake port 1a is closed with respect to the supply port 3a, the discharge port 1b is discharged. It communicates with the outlet 5a.
[0014]
The cylinder holder 3 is attached so that the supply port 3a of the screwed union 6 faces the position corresponding to the intake port 1a of the cylinder 1. The screwed union 6 is detachably attached to the material supply unit S. The material supply unit S is provided with, for example, a high-pressure ball valve so that a highly viscous substance does not flow out while the screwed union 6 is detached. Further, a flange 7 is bolted to the upper end of the cylinder holder 3 via a fixing plate 8. The flange 7 has an inner diameter that is smaller than the inner diameter of the cylinder holder 3, and the inner end of the flange 7 is engaged with the edge of the cylinder 1 so that the cylinder 1 does not come out.
[0015]
The discharge nozzle 9 is mounted on the lower side of the shielding plate 5 and discharges a highly viscous substance from the narrowed tip portion. The discharge nozzle 9 is detachable with respect to the shielding plate 5 by screwing the nozzle presser 10 to the lower end of the cylinder holder 3 and can be exchanged for one having various nozzle diameters. is there.
Next, a method for applying a highly viscous substance to the surface to be applied using the above-described coating apparatus will be described.
[0016]
First, as shown in FIG. 1, the plunger pusher P is connected to the material supply unit S, and the cylinder 1 is set so that the intake port 1 a of the cylinder 1 communicates with the supply port 3 a of the cylinder holder 3. At this time, the discharge port 1 b of the cylinder 1 is closed by the shielding plate 5. In the state of FIG. 1, the high-viscosity substance is introduced into the cylinder 1 by supplying the high-viscosity substance from the material supply unit S and raising the plunger 2.
[0017]
Next, as shown in FIG. 2, the cylinder 1 is set so that the discharge port 1 b of the cylinder 1 communicates with the discharge port 5 b of the shielding plate 5 by rotating the cylinder 1 with the rotation driving device 4. At this time, the intake port 1 a of the cylinder 1 is closed by the inner surface of the cylinder holder 3.
As described above, after the fixed amount of the high-viscosity substance is once stored in the plunger pusher P, the plunger pusher P is disconnected from the material supply unit S and is made operable according to the shape of the coated surface. In this case, since the screw-in union 6 of the material supply unit S is composed of a high-pressure ball valve, leakage of the material due to the residual supply pressure is prevented.
[0018]
In the state of FIG. 2, when the plunger 2 is lowered, the highly viscous substance in the cylinder 1 passes through the discharge port 1 b of the cylinder 1 and the discharge port 5 a of the shielding plate 5 and is pushed out from the tip of the discharge nozzle 9. Therefore, by moving the plunger pusher P along the shape of the surface to be coated simultaneously with the lowering of the plunger 2, a certain amount of highly viscous substance can be applied to the surface to be coated. Moreover, after all the highly viscous substances in the cylinder 1 have been pushed out, the application operation can be repeated by connecting the plunger extruder P to the material supply unit S again.
[0019]
As described above, the material supply unit S composed of a large hydraulic extruder or the like and the small and lightweight plunger extruder P are separable, and the plunger extruder P storing a high-viscosity substance for one cycle is operated. Therefore, the device configuration can be reduced in size and weight. In addition, the plunger pusher P that drives the piston 1 by a ball screw or the like has a stable thrust and can easily control the stroke speed, so that a highly viscous substance can be applied with high accuracy.
[0020]
Furthermore, since the plunger pusher P described above opens and closes the intake port 1a and the discharge port 1b of the cylinder 1 based on the rotation of the cylinder 1, a small and lightweight valve mechanism that instantaneously stops the discharge of the highly viscous substance. Can be configured.
In the present invention, as the high-viscosity substance, a substance having a viscosity of 5 × 10 ⁷ to 2 × 10 ⁹ centipoise is preferably used, and can be appropriately selected according to the application. In addition, the application of the present invention is not particularly limited as long as the operation includes application of a highly viscous substance. For example, application of a sealing material to an oil pan, a head cover, a rocker cover, etc. of an automobile engine, or a microwave oven Application of a sealing material to the window frame.
[0021]
【Example】
1, the cylinder 1 is made of polyimide resin, the plunger 2 and the arm 1m are made of stainless steel (SUS304), the cylinder holder 3, the shielding plate 5, the union 6, the flange 7, and the fixing plate 8. The drive motor of the linear motion device that makes the material of the nozzle 9 and the nozzle holder 10 duralumin, the inner diameter of the cylinder 1 is 12 mm, the actual capacity is 10 cc, the inner diameter of the nozzle 9 is 3 mm, and the plunger 2 is moved up and down. A coating apparatus having a rated output of 200 W was produced.
[0022]
A silicone rubber composition (composition comprising dimethylpolysiloxane raw rubber, silica fine powder and organic peroxide) having a viscosity of 1 × 10 ⁹ centipoise at 25 ° C. was introduced into this apparatus, and this composition was added at 1 to 30 g / min. The silicone rubber composition was uniformly applied to the seal part of the oil pan.
[0023]
【The invention's effect】
As described above, according to the method for applying a high-viscosity substance of the present invention, an intake port and a discharge port for a high-viscosity substance are provided at the end of a cylinder inserted so as to reciprocate a plunger, and the cylinder is a cylinder. The cylinder holder is rotatably held around an axis, and the cylinder holder is provided with a high-viscosity substance supply port and a discharge port communicating with the discharge nozzle, and the cylinder holder supply port and the cylinder A plunger extruder configured such that the communication with the intake port and the communication between the discharge port of the cylinder holder and the discharge port of the cylinder can be alternately switched by the rotation of the cylinder ; After the high-viscosity substance is stored in a fixed amount in the cylinder, it is applied from the plunger extruder to the surface to be applied. It is possible.
[0024]
Further, according to the high viscosity substance coating apparatus of the present invention, the high viscosity substance intake and discharge ports are opened and closed based on the rotation of the cylinder of the plunger extruder. In addition, it is possible to configure a small and lightweight valve mechanism that instantaneously stops the discharge of the highly viscous substance.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing a high-viscosity substance quantitative application apparatus according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along the line AA in FIG.
2A is a cross-sectional view showing the operation of the coating apparatus of FIG. 1, and FIG. 2B is a cross-sectional view taken along line AA in FIG.
3A is a top view of the shielding plate in FIGS. 1 and 2, and FIG. 3B is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
S Material supply part P Plunger pusher 1 Cylinder 1a Intake port 1b Discharge port 2 Plunger 3 Cylinder holder 3a Supply port 5 Shielding plate 5a Discharge port 9 Discharge nozzle

Claims (6)

The end of the cylinder inserted so as to reciprocate the plunger is provided with an intake port and a discharge port for the high-viscosity substance, and the cylinder is held in a cylinder holder so as to be rotatable about the cylinder axis. The cage is provided with a supply port for the high viscosity substance and a discharge port communicating with the discharge nozzle, and the communication between the supply port of the cylinder cage and the intake port of the cylinder and the discharge port of the cylinder holder and the discharge of the cylinder are provided. A plunger extruder configured such that communication with the outlet can be alternately switched by rotation of the cylinder is used. After a high-viscosity substance is temporarily stored in the cylinder of the plunger extruder, the plunger extruder is used. A method for quantitative application of highly viscous substances to be applied to the surface. The method for quantitatively applying a high-viscosity substance according to claim 1, wherein the high-viscosity substance has a viscosity at 25 ° C. of 1 × 10 ⁶ centipoise or more. The method for quantitatively applying a highly viscous substance according to claim 1, wherein the highly viscous substance is a silicone rubber composition. The end of the cylinder inserted so as to reciprocate the plunger is provided with an intake port and a discharge port for the high-viscosity substance, and the cylinder is held in a cylinder holder so as to be rotatable about the cylinder axis. The cage is provided with a supply port for the high viscosity substance and a discharge port communicating with the discharge nozzle, and the communication between the supply port of the cylinder cage and the intake port of the cylinder and the discharge port of the cylinder holder and the discharge of the cylinder are provided. A high-viscosity substance quantitative application device configured to be able to alternately switch communication with an outlet by rotation of the cylinder. The high-viscosity substance quantitative application apparatus according to claim 4, wherein the viscosity of the high-viscosity substance at 25 ° C is 1 x 10 ⁶ centipoise or more. The quantitative application apparatus for a high-viscosity substance according to claim 4, wherein the high-viscosity substance is a silicone rubber composition.

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