JP2019098203A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the end shape of a coating film. A coating device is branched from a coating material, a tank 11, a die 12 for discharging the coating material, a first pipe 13 connecting the die 12 and the tank 11, and a first pipe 13. The second pipe 14 connected to the tank 11, the coating valve 15 arranged between the branch point of the first pipe 13 and the second pipe 14, and the die 12, and the first coating valve 15 to operate the coating valve 15. The motor 21, the circulation valve 16 arranged in the second pipe 14, the second motor 22 for operating the circulation valve 16, and the branch point between the first pipe 13 and the second pipe 14 and the tank 11 are arranged. A sackback valve 18 arranged between the die 12 and the coating valve 15 and a third motor 23 for operating the sackback valve 18 are provided, and the coating material is provided from the die 12. After closing the coating valve 15 during discharge, the sackback valve 18 is driven to draw in the coating material near the tip of the die 12. [Selection diagram] Fig. 1

Description

  The present invention relates to a coating apparatus for forming a coating film.

  Conventionally, there exists Unexamined-Japanese-Patent No. 2014-079669 as a technique of such a field. The coating device described in this publication describes that a coating film is formed by intermittent coating using a valve that doubles as the flow of the coating material and the suction function of the coating material.

JP, 2014-079669, A

However, in order to improve the productivity of products, speeding up of the process is required, and speeding up of the process of purifying the coating film using a coating apparatus is required. For example, in a related related coating apparatus as shown in FIG. 5, a switching valve and a valve for performing switching + suckback are synchronously operated using two servomotors. However, this coating apparatus is not suitable for speeding up because the link mechanism is complicated. In addition, there is a problem that it is difficult to adjust the end shape of the coating film because the operation is complicated because switching of the flow of the coating material and the suckback are both used and the adjustment of the operation is difficult. .
The present invention provides a coating apparatus that facilitates adjustment of the end shape of the coating film.

The coating apparatus according to the present invention comprises a coating material, a tank for storing the coating material, a die for discharging the coating material, and a first pipe for connecting the die and the tank. A second pipe branched from the first pipe and connected to the tank, a coating valve disposed between the first pipe and a branch point of the second pipe, and the die, and the coating valve A second motor for operating the circulation valve, a branch point between the first pipe and the second pipe, the tank, and a first motor for operating the first motor, a circulation valve disposed in the second pipe, a second motor for A pump disposed between the die, a suck back valve disposed between the die and the coating valve, and a third motor for operating the suck back valve, the coating from the die Close the coating valve while discharging material After performs retraction of the coating material of the die tip near by driving the suck back valve.
As a result, it is possible to operate the suck back valve in a state in which the space from the die to the coating valve is closed, and to draw the coating material to the suck back valve side.

  Thereby, the end shape of a coating film can be adjusted easily.

It is a figure showing composition of a coating device. It is a figure which shows the operation | movement of the coating start of a coating apparatus. It is a figure which shows the operation | movement of the finish of a coating apparatus. It is a figure which shows the timing of operation | movement of each valve | bulb, and a coating state. It is a figure which shows the structure of a related coating apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the coating apparatus 1 includes a tank 11 for storing a coating material, a die 12 for discharging the coating material, a first pipe 13 for connecting the tank 11 and the die 12, and a first The second pipe 14 branched from the pipe 13 and connected to the tank 11, the coating valve 15 disposed between the branch point of the first pipe 13 and the second pipe 14 and the die 12, and the second pipe 14 Circulation valve 16, the pump 17 disposed between the branch point of the first pipe 13 and the second pipe 14 and the tank 11, and the suck back valve 18 disposed between the die 12 and the coating valve 15 And. In FIG. 1, the operating directions of the coating valve 15, the circulation valve 16, and the suck back valve 18 are indicated by arrows.

  The tank 11 stores a fluid coating material to be discharged from the die 12. The coating material stored in the tank 11 flows out through the first pipe 13 by the operation of the pump 17. The coating material passes from the tank 11 through the first pipe 13 by the operation of the pump 17 as described later, and reaches the branch point between the first pipe 13 and the second pipe 14. Here, in a case where the coating material is discharged from the die 12 (discharged state), the coating material flows in the direction of the die 12 through the first pipe 13. On the other hand, when it is set as the state which does not discharge from die | dye 12 (circulation state), coating material flows so that it may return to the tank 11 through the 2nd piping 14.

  The die 12 is a discharge part of a coating material whose tip is formed thin. For example, the tip of the die 12 is disposed to face a roll-shaped application target (not shown). Further, the die 12 discharges the coating material flowed in through the first pipe 13 from the front end side, and forms a coating film on the application target which rotates at a position facing the front end of the die 12. The first pipe 13 is connected to the rear end of the die 12.

  The first pipe 13 is a pipe connecting the tank 11 and the die 12. A coating material flows in the first pipe 13. In addition, on the path of the coating material in the first pipe 13, the suck back valve 18, the coating valve 15, and the pump 17 are disposed in this order from the side where the die 12 is disposed. A branch point to the second pipe 14 is provided between the coating valve 15 and the pump 17. In addition, at the portion where the suck back valve 18 is provided, the first pipe 13 is located at another portion so that radial operation is possible with the suck back valve 18 inserted in the first pipe 13. Compared to the larger diameter. In addition, when setting it as a discharge state, the 1st piping 13 was discharged from the tank 11 by having the coating valve 15 open, and reached the branch point of the 1st piping 13 and the 2nd piping 14 The coating material flows towards the die 12. On the other hand, in the case of the circulation state, the coating material does not flow toward the die 12 from the branch point of the first pipe 13 and the second pipe 14 because the coating valve 15 is closed.

  One end of the second pipe 14 is connected between the coating valve 15 of the first pipe 13 and the pump 17, and the other end is connected to the tank 11. Further, a circulation valve 16 is disposed on the path of the coating material flowing through the second pipe 14. In the second pipe 14 in the discharge state where the coating material is discharged from the die 12, the coating material does not flow because the circulation valve 16 is closed. When the circulation valve 16 is open, the coating material returns to the tank 11 from the branch point side of the first pipe 13 and the second pipe 14 through the second pipe 14.

  The coating valve 15 has a substantially cylindrical shape, and is provided with a hole 15a passing from the outer peripheral surface of the substantially cylindrical shape through the central axis to the outer peripheral surface on a diagonal. Typically, the coating valve 15 is disposed so that the outer peripheral surface of the substantially circular cylinder is diagonally sandwiched by the pipe used as the first pipe 13. The diameter of the hole 15 a is substantially the same as the diameter of the pipe used as the first pipe 13 disposed so as to sandwich the coating valve 15. The coating valve 15 is rotated by the power generated by the first motor 21 connected to the coating valve 15 with the center axis of the substantially cylindrical column as the rotation axis.

  Here, the coating valve 15 is rotated by the power of the first motor 21, and the piping constituting the first piping 13 disposed so as to sandwich the position of the opening of the hole 15 a and the outer periphery of the coating valve 15 When the positions coincide, the coating material can be opened in the hole 15a. As a result, the coating material flows toward the die 12 and is in a discharge state in which the coating material is discharged from the die 12.

  On the other hand, the coating valve 15 is rotated by the power of the first motor 21, and the position of the opening of the hole 15a and the position of the pipe constituting the first pipe 13 arranged to sandwich the outer periphery of the coating valve 15 Is not matched, the coating valve 15 is in a closed state where the coating material can not pass.

  The first motor 21 receives supply of power from, for example, an external power supply (not shown) to generate a rotational force for rotating the coating valve 15.

  The circulation valve 16 is substantially cylindrical like the coating valve 15, and is provided with a hole 16a passing from the outer peripheral surface of the substantially cylindrical shape through the central axis of the substantially cylindrical shape to the outer peripheral surface on the diagonal. Further, the circulation valve 16 is disposed so that the outer peripheral surface of the substantially circular cylinder is diagonally sandwiched by the piping used for the second piping 14. The diameter of the hole 16 a is substantially the same as the diameter of the pipe used as the second pipe 14 disposed so as to sandwich the circulation valve 16. The circulation valve 16 is rotated by power generated by the second motor 22 connected to the circulation valve 16 with the center axis of the substantially cylindrical column as the rotation axis.

  The second motor 22 receives supply of power from, for example, an external power supply (not shown) to generate a rotational force for rotating the circulation valve 16.

  Here, the circulation valve 16 is rotated by the power of the second motor 22, and the position of the opening of the hole 16a and the position of the pipe constituting the second pipe 14 disposed so as to sandwich the outer periphery of the circulation valve 16 are In the case of a matched state, the circulation valve 16 is in an open state where the coating material can pass through the hole 16a. As a result, the coating material can flow in the second pipe 14.

  On the other hand, the circulation valve 16 is rotated by the power of the second motor 22, and the position of the opening of the hole 16a and the position of the pipe constituting the second pipe 14 arranged to sandwich the outer periphery of the circulation valve 16 are aligned. In the state where it does not meet, the circulation valve 16 is in a closed state where the coating material can not pass.

  The pump 17 is provided in the first pipe 13. Typically, the pump 17 is disposed in the vicinity of the tank 11, and the coating material is discharged from the tank 11 into the first pipe 13 by operating the pump 17.

  The suck back valve 18 has a substantially cylindrical piston shape, and is inserted inward from the outer diameter side of the first pipe 13. A third motor 23 is connected to the suck back valve 18. The suck back valve 18 is driven inward (inward) from the outside of the first pipe 13 or outward (inward) from the inside by the power received from the third motor 23. As a result, when the suck back valve 18 is driven in the pushing direction, the suck back valve 18 intrudes into the first pipe 13 so that the flow rate of the coating material discharged from the die 12 is rapidly raised. become. On the other hand, when the suck back valve 18 is driven in the pull-in direction, the flow rate of the coating material is sharply lowered.

  The third motor 23 receives supply of power from, for example, an external power supply (not shown), and generates a force for causing the suck back valve 18 to perform an operation of pushing and drawing.

  Next, with reference to FIG.2 and FIG.3, the operation | movement at the time of the application start by the coating apparatus 1 and the operation | movement at the time of the completion of application are demonstrated. First, the beginning of painting will be described.

  As shown in FIG. 2A, in the initial state, the coating valve 15 is in a closed state, and the circulation valve 16 is in an open state. At this time, the coating material discharged from the tank 11 to the first pipe 13 by the operation of the pump 17 is fed from the branch point of the first pipe 13 and the second pipe 14 to the second pipe 14 provided with the circulation valve 16. Street, return to tank 11. The suck back valve 18 is in a retracted state.

  Next, as shown in FIG. 2B, by operating the second motor 22, the circulation valve 16 is pivoted to be in a closed state. Here, since the pump 17 is operating, the coating material is pressurized in the vicinity of the branch point of the first pipe 13 and the second pipe 14.

  As shown in FIG. 2C, by operating the first motor 21, the coating valve 15 is pivoted to be in an open state. Thus, the coating material flows from the branch point of the first piping 13 and the second piping 14 through the coating valve 15 and flows toward the die 12.

  As shown in FIG. 2D, by operating the third motor 23, the suck back valve 18 is brought into a depressed state. As a result, the flow rate of the coating material discharged from the die 12 is rapidly raised.

  Next, the finish of coating will be described. As shown in FIG. 3A, in the initial state, the coating valve 15 is in the open state, the circulation valve 16 is in the closed state, and the suck back valve 18 is in the depressed state. At this time, the coating material discharged from the tank 11 to the first pipe 13 by the operation of the pump 17 is discharged from the die 12.

  As shown in FIG. 3B, by operating the first motor 21, the coating valve 15 is rotated to bring it into a closed state. In other words, the coating valve 15 is closed while discharging the coating material from the die 12. Further, by operating the second motor 22, the circulation valve 16 is rotated and opened. Thus, the coating material passes through the second pipe 14 provided with the circulation valve 16 from the branch point of the first pipe 13 and the second pipe 14 and returns to the tank 11.

  As shown in FIG. 3C, the third motor 23 is operated to bring the suck back valve 18 into a retracted state. As a result, in the first pipe 13, drawing of the coating material occurs between the die 12 and the coating valve 15. Accordingly, the coating can be finished in a state where the coating material present in the vicinity of the die 12 and the die 12 is drawn toward the vicinity of the suck back valve 18.

  Here, FIG. 4 is a diagram summarizing changes in the state of the film thickness of the material by discharging the coating material from the die 12 and the states of the coating valve 15, the circulation valve 16 and the suck back valve 18, respectively. . Although the coating valve 15, the circulation valve 16, and the suck back valve 18 have been described to operate independently of each other in the above description, as shown in FIG. it can.

  First, I will explain the beginning of painting. At time t1, the valves of the coating valve 15, the circulation valve 16, and the suck back valve 18 simultaneously start to operate. That is, the circulation valve 16 starts to change from the open state to the closed state, the coating valve 15 from the closed state to the open state, and the suck back valve 18 from the retracted state to the depressed state.

  At time t2, the circulation valve 16 is closed, and the coating valve 15 is opened. The suck back valve 18 is in the state of being changed from the retracted state to the depressed state. For example, between time t1 and time t2, it is 15 ms. In addition, since there is a delay from the time t1 to the time t2 until the coating material is discharged in the die 12, it is in an uncoated state.

  Between time t2 and time t3, the state change of the circulation valve 16 and the coating valve 15 ends, and the change to the pushed-in state of the suck back valve 18 is continued. Then, at time t3, the change of the suck back valve 18 to the depressed state is completed. For example, it is 25 ms between time t1 and time t3. At this time, from time t2 to time t3, due to the suction effect, the state of the coated film rises from the uncoated state to a state where the film thickness is rapidly formed.

  As described above, the fluid pressure of the coating material can be increased by prolonging the time taken for the change of the suck back valve 18 to the pushing state as compared with the time taken for the change of the circulation valve 16 to the closed state. it can.

  From the time t3 when the process of the start of coating ends to the time t4 when the process of the end of coating starts, a constant amount of coating material is continuously discharged from the die 12 by the operation of the pump 17. A coating film is continuously formed.

  Next, the finish of coating will be described. At time t4, the coating valve 15 and the circulation valve 16 simultaneously start to operate. That is, the circulation valve 16 starts to change from the closed state to the open state, and the coating valve 15 starts to change from the open state to the closed state. That is, the coating valve 15 starts closing the valve while discharging the coating material from the die 12.

  At time t5, the state change from the closed state to the open state of the circulation valve 16 ends, and the state change from the open state to the closed state of the coating valve 15 ends. For example, it is 15 ms between time t4 and time t5. For example, since there is a time difference from the time t4 to the time t5 before the coating material discharged from the die 12 runs out, for example, the time may be close to the time t5 and the film thickness of the coating film may start to be thin.

  Furthermore, at time t5, the change from the pushed-in state of the suck back valve 18 to the drawn-in state is started. Here, the operation of the suck back valve 18 is started after the state change from the open valve state of the coating valve 15 to the closed valve state. Therefore, the suck back valve 18 is a space in which the inside of the first pipe 13 between the coating valve 15 and the die 12 is closed (hereinafter, space Q: a space from the tip of the die 12 to the coating valve 15) Perform the pull-in operation.

  At time t7, the change of the suck back valve 18 to the retracted state ends. For example, it is 25 ms between time t5 and time t7.

  Here, the time between time t5 and time t7 is t6. Since the suck back valve 18 performs the retraction operation in the space Q, the fluid pressure of the coating material in the space Q is reduced from time t5 to time t6, and the discharge of the film forming material from the die 12 is rapid due to the suction effect. It becomes broken. Typically, discharge of the coating material from the die 12 stops at time t6, which is earlier than time t7 at which the state change to the retracted state of the suck back valve 18 is completed, and the state of the coated film is uncoated It becomes.

  In this way, the end-of-coating operation can be performed in a state in which the coating material is clean. That is, at the end of coating, the coating valve 15 is closed to form the space Q which is a closed space, and then the drawing operation by the suck back valve 18 is performed, whereby the coating material retained near the tip of the die 12 Can be rapidly drawn toward the suck back valve 18. As a result, the coating material is drained well and control of the end shape of the coating can be easily performed.

  Further, each of the coating valve 15 and the circulation valve 16 switches between the valve opening state and the valve closing state by the rotational operation, so that it can be switched at high speed as compared with the case of performing the reciprocating operation.

  The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 coating apparatus 11 tank 12 die 13 1st piping 14 2nd piping 15 coating valve 15a hole 16 circulation valve 16a hole 17 pump 18 suckback valve 21 1st motor 22 2nd motor 23 3rd motor

Claims (1)

Coating material,
A tank for storing the coating material;
A die for discharging the coating material;
A first pipe connecting between the die and the tank;
A second pipe branched from the first pipe and connected to the tank;
A coating valve disposed between the first pipe, a branch point of the second pipe, and the die;
A first motor for operating the coating valve;
A circulation valve disposed in the second pipe;
A second motor for operating the circulation valve;
A pump disposed between the tank and a branch point between the first pipe and the second pipe;
A suck back valve disposed between the die and the coating valve;
And a third motor for operating the suck back valve.
After the coating valve is closed while discharging the coating material from the die, the suck back valve is driven to pull in the coating material near the tip of the die.
Coating device.

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