JPS6152747B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a method and device for automatically applying a coating liquid to a surface to be coated, and more specifically,
In addition to performing the required painting economically and efficiently,
The present invention relates to an automatic coating device developed for the purpose of obtaining a uniform and good coating surface without causing any unevenness without causing any problems to environmental hygiene.

Methods for applying coating liquid to the surface to be painted include brush coating, spray coating, flow coating, and dip coating. Not only are there limitations, but the application operation and management are particularly difficult. Therefore, in general, brush painting method or
Spray coating is preferred, but the former is inefficient because it is often done manually, and the amount of coating fluid that is retained on the brush itself is unstable, making it difficult to achieve a uniform and spotless coating. requires a high degree of skill and attention, and is considered unsuitable as a coating method in mass production processes. On the other hand, in the case of the latter, the disadvantages of the former can be almost eliminated, but it not only reduces coating efficiency due to scattering of the coating liquid spray, but also has disadvantages such as deterioration of environmental hygiene. From the viewpoint of soaring prices and countermeasures against pollution, these shortcomings are becoming extremely important and becoming a problem.

The present invention belongs to the above-mentioned brush coating method, and was developed and completed for the purpose of providing a coating device that can satisfactorily solve the drawbacks of the brush coating method. A brush having a coating liquid outlet at its base and configured to be movable relative to the surface to be painted, a valve provided on the coating liquid supply pipe, and a valve that opens and closes the valve in synchronization with the start and end of painting. This invention relates to an automatic coating device comprising an automatic switching mechanism, the automatic switching mechanism being configured to be operated by a limit switch, and a constant pressure operation control mechanism provided in the flow path of the coating liquid. .

Hereinafter, the details of the present invention will be explained based on the embodiment drawings. Fig. 1 is a partially omitted explanatory diagram showing the basic structure of the painting brush used in the present invention and one state of use thereof. The brush 1 shown in the embodiment is constructed by drilling a plurality of coating fluid outlet ports 4 in the base (substrate) 3 of a large number of brushes 2.
The supply pipe 9 for the coating liquid 8 supplied from the coating liquid tank 5 via the pump 6 and the valve 7 is connected in a branched manner.
The coating liquid is configured to automatically flow out to the brush 2 portion.

10 is a rotatably installed pipe-shaped object to be painted, 11 is a coating liquid receiving tank placed at the bottom of the object, which receives excess coating liquid dripped during coating;
This is configured to be circulated through a circulation pipe 12 and a filter 13, and although not shown, when the object 10 to be coated is rotated and the coating liquid is applied to the surface thereof, the coating operation is performed. The valve 7 is automatically opened and closed in synchronization with the start and end of the process using a limit switch, a time switch, etc. provided at appropriate locations to start and stop the supply of the coating liquid.

In addition, a constant pressure operation control mechanism (not shown) is provided in the pump 6 to keep the pressure of the coating liquid constant, thereby maintaining the amount of coating liquid flowing out per unit time. Alternatively, the opening/closing degree of the valve 7 may be configured to be adjustable according to a preset program, and the amount of the coating fluid flowing to the brush portion may be automatically increased or decreased, and further,
Various automatic switching mechanisms for valves operated by limit switches, time switches, etc. can be used, such as electromagnetic mechanisms, pneumatic mechanisms, hydraulic mechanisms, and mechanical mechanisms.

FIGS. 2 and 3 show other embodiments of the present invention, and are examples of coating the outer surface, inner surface, and end surface of a pipe 10, which is an object to be coated. In this embodiment, Using three brushes: a brush 1a for painting the outside surface of the pipe, a brush 1b for painting the inside surface, and a brush 1c for painting the end surface, two coating liquid supply pipes 9a and 9b, each equipped with a valve 7a and 7b, are installed on the movable trolley 14. At the same time, smaller brushes 1a and 1b than in the above embodiment are provided at the tip of each supply pipe, and the tip of each brush is attached to the pipe 1.
0 and is configured to apply a predetermined coating to the inner and outer surfaces of the pipe by reciprocating the moving cart (in the left and right directions as viewed in the figure) and rotating the pipe 10 by the trochanter 15. . Further, the brush 1c is provided at the tip of one coating liquid supply pipe 9c which has a valve 7c arranged to be movable up and down according to the wall thickness of the pipe 10.
0, and the pipe 9c is moved up and down and the pipe 10 is rotated to apply a desired coating to the end face of the pipe.

In the above-mentioned apparatus, similarly to the above, a limit switch, a time switch, etc. are used to cause the coating liquid to flow out to the brush portion only during painting operations, thereby preventing loss of the coating liquid. As shown in FIG. 2, when the brushes 1a and 1b are positioned at the tip of the pipe 10 and ready to start painting, the switch actuators 16a and 16a provided on the pipes 9a and 9b are activated.
16b turns on the limit switches S ₁ and S ₂ , opens the valves 7a and 7b through the automatic switching transmission mechanism of the appropriate valves, and at the same time, the moving truck 14 moves to the right as seen in the figure, and the coating liquid flows out to both brushes. By moving in the direction, the pipe surface is coated with the required width. When the trolley moves and the brushes 1a and 1b reach the positions shown in FIG. 3 and one pass of painting is completed, the switch actuators 1
Limit switches S ₁ and S ₂ are activated by 7a and 17b.
OFF, valves 7a and 7b are closed via an appropriate valve automatic switching transmission mechanism, and the flow of coating liquid to both brush parts is stopped.

Similarly to the above, application to the end face of the pipe 10 by the brush 1c is also performed by moving the limit switch _S3 by the switch actuator 18 in synchronization with the vertical movement of the pipe 9c.
The valve 7c is switched ON and OFF, and the valve 7c is automatically opened and closed to supply and drain the coating liquid to the brush portion only during painting work. Since the end surface of the pipe 10 has a smaller coating area than the inner and outer surfaces, the flow rate of the coating liquid flowing through the pipe 9c is reduced, or preferably, a timer or the like is used to shorten the coating time with the brush 1c. Also, brushes 1a, 1b, 1c and pipe 1
It is preferable that the relative contact and isolation operations with respect to 0 are performed in connection with a switch, and these operations are performed by a required switch actuator and limit switch.

FIG. 4 shows another embodiment of the present invention, in which the basic technique of supplying the coating liquid to the brush portion only during painting work is the same as the above-mentioned embodiments. Since the pipe 10 is an irregularly shaped pipe 10, the pipe 10 is equipped with a brush 2 having different lengths of bristles according to the difference in diameter and length of each part of the pipe 10.
By using a brush 1 having the same length as the brush 1 and moving the brush up and down using the pivoting part 19 as a fulcrum,
This embodiment differs from the embodiments described above in that the valve 7 is automatically opened and closed by switching the limit switch S between ON and OFF.

FIG. 5 shows another embodiment of the present invention. In this embodiment, the coating liquid tank 5 is used instead of using the coating liquid supply pump 6 as in the other embodiments. is placed higher than brush 1,
This embodiment differs from the other embodiments in that the coating liquid is naturally supplied to and flows out of the brush portion by utilizing the head difference, but there is no difference in the basic principle. In the case of this embodiment, since the amount of liquid in the coating liquid tank 5 decreases and changes, the amount of coating liquid applied tends to vary, and it is not suitable for painting work that requires strict control of the coating thickness. Since the equipment is simple, it is practical depending on the construction details.

In order to solve the problem of the above-mentioned variations, this embodiment uses an extremely wide and shallow coating tank 5 as shown in the figure, or a preliminary coating tank equipped with a float valve 20. The liquid tank 21 is arranged above the coating liquid tank 5, and when the coating liquid in the tank 5 decreases to a certain amount, the float valve is automatically lowered and opened to replenish the coating liquid, and the coating liquid in the tank 5 is increased. The structure is such that the amount of coating liquid can be kept as constant as possible to eliminate variations.

Furthermore, as mentioned in the first embodiment, there is a constant pressure operation control mechanism provided in the flow path of the coating liquid in order to maintain a fixed amount of the coating liquid flowing out per unit time, and it can be adjusted according to a preset program. The mechanism for adjusting the amount of coating fluid flowing out by adjusting the opening/closing degree of the valve configured in the above is also adopted and equipped in other embodiments.

6 and 7 respectively show other embodiments of the brush 1. In FIG. 6, a spray method is adopted for the outflow part of the coating liquid, and the coating liquid is applied to the base (substrate) 3. An outlet 4 is provided, a ball valve 22 is fitted into the outlet, and a brush member in which brushes 2 are implanted in a spray plate 24 having a large number of pores 23 is installed on the lower surface of the base 3 so as to be movable up and down. Along with fitting,
The brush 1 is constructed by having push pins 25 erected on the spray plate 24 in correspondence with the position and number of the coating liquid outlet ports 4 and facing the lower part of the ball valve 22. According to this embodiment, when the brush is brought into pressure contact with the painting surface of the object to be painted, the spray plate 24 is raised and the ball valve 22 is pushed up and opened at the tip of the push pin 25, so that the pressurized feed is carried out. The applied coating liquid is dispersed and ejected from a large number of pores 23 through the outlet 4, and is evenly distributed and supplied to the entire brush 2, thereby making it possible to perform the desired coating evenly and evenly.

Fig. 7 shows an example in which the brush 1 is constructed by using a sponge 2a with continuous pores as the brush material instead of the brush 2, but it is also possible to use felt or other water-permeable material other than sponge as the brush material. In short, the selection of brush material should be determined freely depending on conditions such as the condition of the painted surface of the object to be painted, the affinity of the coating liquid, and the thickness of the coating film.

FIG. 8 shows another embodiment of the brush 1, in which a plurality of spray nozzles 26 are branched from the coating liquid supply pipe 9, and a spray nozzle system is adopted for the coating liquid outlet. This is just an example, and according to this embodiment, it is possible to perform a uniform coating without spots similar to that shown in FIG. 6 with a significantly simpler structure than that shown in FIG.

As described above in detail, according to the automatic painting device according to the present invention, it is possible to perform the required painting by supplying and draining the coating liquid only while painting is being performed, resulting in an extremely economical and resource-saving era. In addition to being able to apply the coating evenly and evenly or to the desired thickness even when using a brush, the constant pressure control mechanism installed in the flow path of the coating liquid It has the advantage of further improving the above-mentioned uniform thickness coating effect, and unlike spray painting, there is no risk of harming the environment, and the desired coating can be achieved efficiently and economically through automatic operation.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is an explanatory diagram of embodiment 1 showing the basic structure of a painting brush and one state of use thereof, and FIGS. 2 and 3 are illustrations of embodiment 2.
FIG. 4 is an explanatory diagram showing the configuration and usage condition of Embodiment 3, FIG. 5 is an explanatory diagram showing the configuration and usage status of Embodiment 4, and FIGS. 6 to 8 Each figure is a partially cutaway front view showing another example of the brush. DESCRIPTION OF SYMBOLS 1...Brush, 3...Base (substrate), 4...Coating liquid outlet, 8...Coating liquid, 9...Coating liquid supply pipe, S...Limit switch.

Claims (1)

[Claims] 1. A brush that is equipped with a plurality of coating liquid outlet ports communicating with the coating liquid supply pipe at its base and configured to be movable relative to the surface to be coated, a valve provided on the coating liquid supply pipe, and a brush that communicates with the coating liquid supply pipe at the start and end of coating. and an automatic valve switching mechanism that opens and closes the valves in synchronization with each other, the automatic switching mechanism is configured to be operated by a limit switch, and a constant pressure operation control mechanism is provided in the flow path of the coating liquid. Automatic painting equipment.