JP2018122225A - Two-liquid type coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-component coating apparatus for uniformly coating a coating film by mixing two liquids of a main agent and a curing agent at the same position on a coated surface. A nozzle head 5 includes actuators 23a and 23b controlled by a controller 14 and valves 22a and 22b whose nozzle holes 51 are opened and closed by the actuators 23a and 23b, and a main agent M and a curing agent H pressurized by an air compressor 10. Are individually selectively discharged from the nozzle holes 51 by the actuators 23a and 23b. In the nozzle head 5, the position of the main agent dot m discharged from the nozzle head 5 to the surface to be coated and the position of the curing agent dot h overlap, and the main agent dots are spaced at intervals of 1/10 or less of the diameter of the main agent dot m. By controlling the controller 14 so that m and the curing agent dot h are discharged, a uniform and smooth coated surface is formed. [Selection diagram] Fig. 1

Description

  The present invention relates to a two-component coating apparatus, and more specifically, a two-component coating apparatus capable of performing a long-time painting operation using a paint composed of a main agent and a curing agent and capable of forming a smooth painted surface. About.

  The spray-type coating apparatus is widely used because of its high work efficiency and relatively uniform coating surface. There are various types of spray coating equipment depending on the type of paint. For example, in order to apply a reactive paint such as unsaturated polyester, polyurethane, and epoxy paint, the paint is composed of two components of a main agent and a curing agent because of the problem of pot life, that is, usable time. Using a liquid constant ratio pump, the two liquids are continuously mixed at a constant ratio through a line mixer such as a static mixer in the paint transport route just before the spray gun, and a method using a general spray gun is applied. Alternatively, an internal mixing type spray gun in which a mixing mechanism is provided inside the spray gun is used.

  The above two methods are not suitable for long-time work because the hardening of the paint work starts. As a spray system that compensates for this drawback, there is a system in which the main agent and the curing agent are separately sprayed by a two-head spray gun in which two spray nozzles are provided in one gun. FIG. 8 is a sectional view showing the structure of the main part of a conventional two-head spray gun. In FIG. 8, only the nozzle portion is shown, and the other portions are not shown. The illustrated two-head spray gun 100 generally includes a first gun 101 and a second gun 102, and the first gun 101 and the second gun 102 are nozzles of the first gun 101. The main agent M discharged from the nozzle 103 and the curing agent H discharged from the nozzle 104 of the second gun 102 are arranged with a predetermined inclination angle so as to intersect each other in the middle. As a result, the main agent M discharged from the first gun 101 and the curing agent H discharged from the second gun 102 reach the surface to be coated in a state of being mixed on the way. Thus, since the two-head spray gun 100 has no fear of mixing the main agent M and the curing agent H inside, the coating operation can be continued stably for a long time.

  As another example of applying a paint composed of a main agent and a curing agent other than a two-head spray gun, for example, there is a coating method disclosed in Patent Document 1. In this coating method, the coating agent is blown off from the nozzle and applied onto the substrate, and then the curing agent is ejected and applied onto the coating agent on the substrate by ink jetting. And a curing agent are formed by a reaction hardening of the curing agent.

JP 2008-183487 A

  However, as a use condition of the two-head spray gun, the discharge amount of the main agent and the discharge agent of the curing agent must be 1: 1. If this condition is not observed, the state of the mixed spray becomes unstable and a uniform coating film cannot be obtained. There are various appropriate mixing ratios of the main agent and the curing agent depending on the type of paint, and there are cases where a two-head spray gun cannot cope. Moreover, the coating method by the said patent document 1 forms the raised coating layer with a three-dimensional effect, and it is not considered at all to apply | coat a coating film smoothly with respect to a coating surface. In addition, it is a condition that the main agent, the curing agent, and further the curing accelerator are applied in the same pattern.

  Therefore, the present invention has been made in view of such a problem, and is a two-component type capable of forming a smooth painted surface while enabling long-time coating using a coating material composed of a main agent and a curing agent. An object is to provide a painting apparatus.

  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a main agent discharge nozzle row having a main agent discharge nozzle provided with a valve for opening and closing the main agent discharge hole, and a valve for opening and closing the curing agent discharge hole. Curing agent discharge nozzle rows arranged in a row with a curing agent discharge nozzle comprising: a valve for opening and closing the main agent discharge hole; an actuator for opening and closing the valve for opening and closing the hardener discharge hole; and the main agent discharge Nozzle head provided with an internal main agent supply path for supplying the main agent to the nozzle and an internal hardener supply path for supplying the hardener to the nozzle for discharging the hardener, and a main agent supply for supplying the pressurized main agent to the nozzle head Means, a curing agent supply means for supplying a pressurized curing agent to the nozzle head, and a controller for performing drive control of the actuator and position control of the nozzle head. The position of the main agent dots discharged from the main agent discharge nozzle row to the surface to be coated and the position of the hardener dots discharged from the hardener discharge nozzle row overlap the surface to be coated. 2. A smooth coating surface is formed by controlling the position of the nozzle head and driving of the actuator so that the main agent dots are discharged at intervals of 1/10 or less of the diameter of the discharged main agent dots. Provide liquid coating equipment.

  According to the two-component coating apparatus according to the present invention, the main agent and the curing agent are ejected to the surface to be coated by the ink jet system in different systems, so that the main agent and the curing agent are not mixed inside for a long time. There is an effect that the painting work becomes possible. In addition, since the main agent dots are discharged at an interval of 1/10 or less of the diameter of the main agent dots discharged onto the surface to be coated, a coating film is formed so that a part of the plurality of main agent dots overlap, so that smoothness is achieved. There is an effect that a smooth painted surface can be formed.

It is a block diagram which shows the whole structure of preferable one Embodiment of the two-component coating apparatus which concerns on this invention. It is sectional drawing which shows the internal structure of a nozzle head. It is explanatory drawing which shows arrangement | positioning of the nozzle row for main agent discharge. It is sectional drawing of the nozzle head provided with the nozzle for main agent discharge, and the nozzle for hardening agent discharge. It is a perspective view which shows the back surface structure of a nozzle head. It is explanatory drawing which shows the discharge state of a main agent dot. It is explanatory drawing which shows the overlap of the main agent dot. It is sectional drawing which shows the structure of the principal part of the conventional 2 head type spray gun.

[Configuration of two-component coating equipment]
The two-component coating apparatus according to the present invention will be described in detail below based on a preferred embodiment. FIG. 1 is a block diagram showing the overall configuration of a preferred embodiment of a two-component coating apparatus according to the present invention, and FIG. 2 is a cross-sectional view showing the internal configuration of a nozzle head. The illustrated two-component coating apparatus 1 is generally attached to the base 2 installed on the floor surface and the base 2, and the tip is moved by moving the arm up and down and left and right by a motor and hydraulic pressure (not shown). The robot arm 4 capable of arranging the part 3 (head) at an arbitrary position and the tip 3 of the robot arm 4 are attached, and the main agent M and the curing agent H are discharged to an object 200 (for example, a car body). Nozzle head 5, main agent tank 8 that supplies main agent M to nozzle head 5 via main agent supply tube 6, and hardener tank 9 that supplies hardener H to nozzle head 5 via hardener supply tube 7. An air compressor 10 for supplying pressurized air to each of the main agent tank 8 and the hardener tank 9 via a pipe 11 and a nozzle head via an actuator control signal cable 12 It is configured to include a controller 14 for controlling the operation of the robot arm 4 via a robot arm control signal cable 13 to control the operation. The main agent supply tube 6, the curing agent supply tube 7, and the actuator control signal cable 12 are grouped together as a cable harness 15, and the actuator control signal cable 12 and the robot arm control signal cable 13 are similarly used as the cable harness 16. It is put together.

  The controller 14 includes a microcomputer (not shown), a storage device such as a ROM / hard disk, an input / output interface, a display, a power supply unit, and the like. The controller 14 operates according to a program stored in the ROM and executes processing as described later. .

[Nozzle head configuration]
As shown in FIG. 2, the nozzle head 5 includes a substrate 50 formed in a substantially rectangular shape, and a plurality (12 in this embodiment) of main agent discharge nozzles 20, 20 on the surface of the substrate 50. A main agent discharge nozzle row 53 arranged in a line in the direction (vertical direction in FIG. 2), and a plurality of (in this embodiment, 12) curing agent discharge nozzles 30, 30 on the surface of the substrate 50 in one direction. There are provided hardener discharge nozzle rows 55 arranged in a line (vertical direction in FIG. 2), and a plurality of main agent discharge nozzle rows 53 and hardener discharge nozzle rows 55 are alternately arranged.

  The substrate 50 is provided with a main agent injection port 57 so that the main agent M is supplied to the main agent discharge nozzle rows 53 and 53 via the main agent flow passage 54 and discharged from the main agent discharge nozzles 20 and 20. It has become. A main agent supply tube 6 extending from the main agent tank 8 is connected to the main agent injection port 57. Similarly, the substrate 50 is provided with a curing agent injection port 58, and the curing agent H is supplied to each of the curing agent discharge nozzle rows 55, 55 via the curing agent flow passage 56, and the curing agent discharge nozzles are supplied. 30 and 30 are discharged. A curing agent supply tube 7 extending from the curing agent tank 9 is connected to the curing agent injection port 58.

  In this embodiment, the vertical interval (p1) between the centers of the main agent discharge nozzles 20 and 20 constituting one main agent discharge nozzle row 53 is 14 mm, and similarly, one hardener discharge nozzle row. The distance between the centers of the respective curing agent discharge nozzles 30 and 30 constituting 55 is 14 mm. The centers of the adjacent main agent discharge nozzle rows 53 and the centers of the curing agent discharge nozzle rows 55 are arranged with a 10 mm interval in the horizontal direction. That is, the interval p2 between the main agent discharge nozzle rows 53 and 53 is 20 mm. Further, the main agent discharge nozzle rows 53 and 53 are arranged with a 0.9 mm gap in the vertical direction, and the curing agent discharge nozzle rows 55 and 55 are similarly spaced apart by 0.9 mm in the vertical direction. It is arranged. Here, FIG. 3 is an explanatory view showing the arrangement of the main agent discharge nozzle arrays 53, 53. FIG. 3 does not show the curing agent discharge nozzle rows 55 and 55. As shown in FIG. 3, paying attention to the main agent discharge nozzle rows 53 and 53, the main agent discharge nozzles 20 and 20 adjacent in the horizontal direction (X-axis direction) are shifted by 0.9 mm in the vertical direction as described above. Since they are arranged, the main agent discharge nozzles 20, 20 adjacent in the horizontal direction are arranged with an inclination of an angle θ in the vertical direction (Y-axis direction). In this embodiment, as shown in FIG. 2, curing agent discharge nozzle rows 55 and 55 are arranged between the main agent discharge nozzle rows 53 and 53, respectively. 55 is also arranged in the same manner as the main agent discharge nozzle rows 53 and 53.

[Configuration of main agent discharge nozzle and curing agent discharge nozzle]
FIG. 4 is a cross-sectional view of a nozzle head provided with a main agent discharge nozzle and a curing agent discharge nozzle. The main agent discharge nozzle 20 and the hardener discharge nozzle 30 have substantially the same configuration, and the difference is whether the medium to be distributed is the main agent M or the hardener H. Therefore, here, the configuration of the main agent discharge nozzle 20 will be described. The main agent discharge nozzle 20 generally has a discharge hole 51 on the lower surface of the substrate 50 constituting the nozzle head 5, a liquid reservoir 21a formed so as to communicate with the discharge hole 51, and a discharge hole. A valve 22a that opens and closes 51, an actuator 23a that is housed in an upper space provided on the upper side of the liquid reservoir 21a in FIG. 4 and reciprocates the valve 22a toward the discharge hole 51, and the actuator 23a advances and retreats. The shaft portion 24a is pivotally supported and a seal portion 25a that maintains the airtightness of the upper space is provided. The liquid reservoir 21a communicates with the main agent flow passage 54, and the main agent M is supplied to the liquid reservoir 21a. Similarly, the curing agent discharge nozzle 30 includes a liquid reservoir 21b, a valve 22b, an actuator 23b, and a seal portion 25b. The liquid reservoir 21b communicates with the curing agent flow path 56, and the liquid reservoir A curing agent is supplied to the portion 21b.

[Nozzle head rear configuration]
FIG. 5 is a perspective view showing the back configuration of the nozzle head. The main agent supply tube 6 and the curing agent supply tube 7 drawn from the end portion of the cable harness 15 are respectively attached to the back side of the nozzle head 5. The main agent supply tube 6 is connected to the main agent flow passage 54 and cured. The agent supply tube 7 is connected to the hardener flow passage 56. A connector 59 provided at the end of the actuator control signal cable 12 drawn from the end of the cable harness 15 is attached to the socket 60 provided on the back of the substrate 50 and exposed from the back of the nozzle head 5. The control signals are transmitted to the actuators 23a and 23b.

[Operations of main agent discharge nozzle and curing agent discharge nozzle]
Next, the operations of the main agent discharge nozzle 20 and the curing agent discharge nozzle 30 will be described with reference to FIG. Since the main agent discharge nozzle 20 and the curing agent discharge nozzle have the same configuration as described above, only the operation of the main agent discharge nozzle 20 will be described here. Normally, since the nozzle hole 51 is closed by the valve 22a, the main agent M is not discharged from the nozzle hole 51 even if the main agent M is accumulated in the liquid reservoir 21a. When the actuator 23 a is driven in this state, the shaft portion 24 a and the valve 22 a are lifted to create a gap between the valve 22 a and the nozzle hole 51, and the main agent M in the liquid reservoir 21 a is pressurized by the air compressor 10. As a result, the main agent droplet is discharged from the nozzle hole 51. When the set time has elapsed, the actuator 23a is de-energized, the shaft 24a and the valve 22a are lowered, the valve 22a closes the nozzle hole 51, and the discharge from the nozzle hole 51 stops. Similarly, the curing agent h is also ejected from the curing agent ejection nozzles 30, 30, and the main agent m and the curing agent h ejected on the surface of the object to be coated 200 are mixed to form a coating film 62 as shown in FIG. 4. It is formed.

[Operation of two-component coating equipment]
Next, the operation | movement coating method of the two-component coating apparatus 1 which concerns on this invention is demonstrated with reference to FIGS. FIG. 6 is an explanatory diagram showing the discharge state of the main agent dots, and FIG. 7 is an explanatory diagram showing the overlap of the main agent dots.

  First, the discharge amount (discharge ratio) of the main agent M and the curing agent H, the coating area and shape, and other necessary data are input to the controller 14. Based on the input data, the microcomputer in the controller 14 appropriately calculates the discharge amounts of the main agent M and the curing agent H. The discharge amounts of the main agent M and the hardener H depend on the operating time of the actuators 23a and 23b, that is, the opening and closing time of the valves 22a and 22b and the pressure of the pressurized air supplied to the main agent tank 8 and the hardener tank 9 by the air compressor 10. It is determined. Then, the controller 14 drives the air compressor 10 to supply pressurized air to the main agent tank 8 and the hardener tank 9 and operates the robot arm 4 via the robot arm control signal cable 13, so that the nozzle head 5 is moved to the coating start position of the article 100 to be coated.

  Next, the controller 14 drives the actuators 23a and 23a of the necessary main agent discharge nozzles 20 and 20 while moving the nozzle head 5 in the X-axis direction (lateral direction), respectively, thereby removing the main agent dot m from the discharge holes 51 and 51. Discharge. Thereby, the row | line | column of the dot 61 of the main agent M corresponding to the nozzle row | line | columns 53 and 53 for main agent discharge adheres to a to-be-coated surface (refer FIG. 6). And the controller 14 overlaps with the space | interval D of 1/10 or less in the X-axis direction with respect to the diameter d of the dot 61 of the main ingredient M discharged to the to-be-coated surface according to the movement of the nozzle head 5 in the X-axis direction. Further, the main agent dot m is discharged (see FIG. 7). By repeating this, the painted surface is formed in a state where a number of dots 61 of the main agent M are overlapped in the horizontal direction on the surface of the surface 200 to be coated.

  When painting by moving the nozzle head 5 in the X-axis direction is completed, the controller 14 moves the nozzle head 5 in the Y-axis direction (vertical direction), and starts painting by moving in the X-axis direction again. At this time, for example, the controller 14 uses the lowermost main agent discharge nozzle 20 in the leftmost main agent discharge nozzle row 53 shown in FIG. 3 as the first nozzle, and the right adjacent main agent discharge nozzle 20 as the second nozzle. In this case, when the nozzle head 5 moves in the Y-axis direction and the coating in the X-axis direction is performed again, the main agent discharge nozzles 20, 20 other than the first nozzle and the second nozzle fill the space between them. Thus, the main agent dot m is further discharged so as to overlap with the diameter d of the main agent M dot 61 in the X-axis direction, which has already been coated, in the Y-axis direction at an interval of 1/10 or less. Accordingly, the coating is performed so that the main agent dot m overlaps with the diameter d of the main agent dot m in the X-axis direction and the Y-axis direction by 1/10 or less, so that a uniform coating surface can be obtained. Similarly, the curing agent H is discharged from the curing agent discharge nozzles 30, 30. At this time, the positions of the curing agent dots h discharged from the curing agent discharge nozzle rows 55, 55 are the main agent discharge nozzles. The coating is performed so as to overlap the position of the main agent dot m discharged from the rows 53 and 53. The discharge amount of the curing agent H does not have to be the same as the discharge amount of the main agent M, and may be an amount that can reliably cure the main agent dots m discharged onto the surface to be coated. Further, the curing agent H only needs to be ejected so as to overlap the position of the main agent dot m, and it is not necessary to eject the curing agent dots h so as to overlap the positions of all the main agent dots m, and is applied to the surface to be coated. What is necessary is just the quantity which can harden the discharged main agent dot m reliably.

  Then, by performing the coating in the X-axis direction and the Y-axis direction while repeating the above-described series of operations, it is possible to apply a visually uniform and smooth coating over the entire area to be coated of the object to be coated 200. Note that if all of the actuators 23a and 23b are operated near the end of the region to be coated, the main agent M and the curing agent H are discharged outside the region to be coated. The actuators 23a and 23b located outside the control are controlled so as not to be driven.

  The main agent discharge nozzle rows 53 and 53 and the curing agent discharge nozzle rows 55 and 55 arranged in the nozzle head 5, or the main agent discharge nozzles 20 and 20 constituting the main agent discharge nozzle row 53 and curing. Various patterns can be adopted for the arrangement of the curing agent discharge nozzles 30, 30 constituting the agent discharge nozzle row 55, and the present invention is not limited to this embodiment. In short, the main agent discharge nozzles 20 and 20 are controlled by the controller 14 so that the main agent dots m are coated so as to overlap each other with a diameter d of the main agent dots m discharged onto the surface to be coated by 1/10 or less. It is important to.

DESCRIPTION OF SYMBOLS 1 Two-component coating apparatus 2 Base 3 Tip part 4 Robot arm 5 Nozzle head 6 Main agent supply tube 7 Hardener supply tube 8 Main agent tank 9 Hardener tank 10 Air compressor 11 Piping 12 Actuator control signal cable 13 Robot arm control Signal cable 14 Controller 15 Cable harness 16 Cable harness 20 Main agent discharge nozzles 21a, 21b Liquid reservoirs 22a, 22b Valves 23a, 23b Actuator 24a Shaft portion 25a Seal portion 25b Seal portion 30 Curing agent discharge nozzle 50 Substrate 51 Nozzle hole 52 Connection path 53 Main agent discharge nozzle row 54 Main agent flow passage 55 Curing agent discharge nozzle row 56 Curing agent flow passage 57 Main agent injection port 58 Curing agent injection port 59 Connector 60 Socket 61 Dot 62 Coating film 200 Coating M main agent H curing agent m main agent dot h curing agent dot

Claims (1)

A main agent discharge nozzle row in which main agent discharge nozzles having valves for opening and closing the main agent discharge holes are arranged in a row;
Curing agent discharge nozzle row in which the hardening agent discharge nozzles provided with valves for opening and closing the hardening agent discharge holes are arranged in a row;
An actuator for opening and closing a valve for opening and closing the main agent discharge hole and a valve for opening and closing the curing agent discharge hole;
A nozzle head provided with an internal main agent supply path for supplying a main agent to the main agent discharge nozzle and an internal curing agent supply path for supplying a curing agent to the curing agent discharge nozzle;
A main agent supply means for supplying a pressurized main agent to the nozzle head;
A curing agent supply means for supplying a pressurized curing agent to the nozzle head;
A controller that performs drive control of the actuator and position control of the nozzle head;
With
The controller is configured so that the position of the main agent dots discharged from the main agent discharge nozzle row to the surface to be coated overlaps with the position of the hardener dots discharged from the hardener discharge nozzle row, and the surface to be coated. A smooth coating surface is formed by controlling the position of the nozzle head and the driving of the actuator so that the main agent dots are discharged at intervals of 1/10 or less of the diameter of the main agent dots discharged to Two-component coating equipment.

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