JPH11290728A - Coating material feed unit for coating device and coating material feeding method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly discharge a desired amount of the coating material by connecting a movable plate to a piston rod inserted in a pair of syringes, making the movable plate in a structure movable with a servomotor and controlling the revolution, etc. of the servomotor at a controlling part. SOLUTION: The coating material feed unit 1 is provided with a pair of the syringes 2 and 3, and the piston rods 4 and 5 are inserted freely movably in the syringes 2 and 3 respectively. The movable plates 6 and 7 are connected to the vicinity of an lower end of the piston rods 4 and 5. The movable plates 6 and 7 are moved by rotating screws 8 and 9 by driving the servomotors 10 and 11. In this way, the piston rods 4 and 5 are moved in the syringes 2 and 3, and the coating materials 18 and 19 are discharged. The piston rods 4 and 5 are moved exactly in the syringes 2 and 3 by previously inputting the revolution etc. of the servomotors 10 and 11 at the controlling part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint supply apparatus for a coating apparatus and a paint supply method using the same. A servo motor for moving the piston rod is provided, and by driving the servo motor to alternately operate a pair of syringes, it is possible to continuously supply paint without interruption and to supply a desired amount of paint. The present invention relates to a paint supply device for a coating device and a paint supply method using the paint supply device, which is capable of discharging accurately.

[0002]

2. Description of the Related Art Conventionally, when a large number of objects to be coated are coated, a coating apparatus in which the spraying operation of the coating material is automated has been used. In this coating apparatus, paint is applied from a spray gun provided at a tip end of a robot arm movable in a coating chamber provided in the coating apparatus toward an object placed on a work supply table. Injected
Thereby, the object to be coated is coated.

[0003] By the way, when painting an object to be painted,
It is necessary to uniformly spray the paint to eliminate so-called paint unevenness, and for that purpose, it is necessary to accurately supply the paint to the spray gun.

[0004] However, in a conventional coating apparatus, a method of supplying a paint to the spray gun generally uses a pressure feed tank.
Therefore, it has been difficult to accurately supply the paint.

When a paint is supplied by using a pressure feed tank, a method is employed in which a high pressure is applied to a tank provided with a discharge nozzle to discharge the paint stored in the tank from the discharge nozzle. Is done. However, when this method is adopted, even if the pressure applied to the tank is kept constant and the discharge amount at the pressure is measured in advance, the spray gun provided at the tip of the nozzle for discharge is used. The discharge amount naturally changes depending on the height, and as a result, the paint may be uneven. That is, when the paint is supplied at a constant pressure by using the pressure feed tank, when the position of the spray gun is increased, the amount of the supplied paint is reduced in relation to the atmospheric pressure. On the contrary, when the position of the spray gun is lowered, there is a problem that the amount of the supplied paint increases.
Also, when the viscosity of the paint changes or the temperature changes, the discharge rate also changes, and as a result, it becomes difficult to spray the paint evenly on the object to be coated, resulting in uneven paint. Would.

Therefore, in order to solve such a problem, there has been proposed a method of using a syringe to discharge paint which has previously been sucked into the syringe.

[0007]

However, when a syringe is used, if the paint in the syringe has been completely discharged, the paint is not discharged until the paint is sucked into the syringe again. There is a problem that the paint cannot be supplied, and as a result, the supplied paint is interrupted.

Therefore, the present invention provides a paint supply apparatus and a paint supply apparatus capable of accurately grasping a paint discharge amount, reliably discharging a desired amount of paint, and preventing the paint to be discharged from being interrupted. It is an object of the present invention to provide a method for supplying paint.

[0009]

SUMMARY OF THE INVENTION A paint supply apparatus for a coating apparatus according to the present invention is a paint supply apparatus for a coating apparatus for supplying a paint to a spray gun which sprays the paint toward an object to be coated in the coating apparatus. A pair of syringes, a piston rod movably inserted into the pair of syringes,
A movable plate connected to the piston rod, a servomotor for moving the movable plate, and a supply of paint into the pair of syringes and a paint from the syringe mounted on the pair of syringe tips; A control unit for controlling the operation of the paint suction / injection means and the servomotor, and driving the servomotor to move the piston rod in the syringe. It is characterized by being movable,
In the paint supply method of the present invention using this, in the initial setting, the inner diameter of the syringe, the discharge amount of the paint, and the rotation speed of the servo motor based on them are set in advance, and in the next step, After inhaling the paint into the syringe, the paint is discharged from one of the syringes that has inhaled the paint, and the paint is sucked into the other syringe,
At the same time when the discharge amount of one syringe reaches a preset value, the discharge of the paint by one syringe is stopped and the suction of the paint is started, and the discharge of the paint by the other syringe is started, and the discharge of the paint by the other syringe is started. While the paint is being discharged, the operation of sucking the paint into one of the syringes is repeated.

In the paint supply apparatus for a coating apparatus according to the present invention, a movable plate is connected to a piston rod inserted into a syringe into which paint is sucked, and the movable plate is moved by a servomotor. By driving the movable plate, the movable plate is moved, whereby the piston rod is moved in the syringe so that the paint in the syringe can be discharged, and further, the rotation number of the servomotor and the like are controlled by the control unit. Therefore, it is possible to accurately control the feed amount of the piston by controlling the number of revolutions of the servomotor, etc. As a result, the discharge amount of the paint can be accurately grasped. It can discharge more, and can prevent the occurrence of paint unevenness.

Further, the paint supply device for a coating device of the present invention is provided with two syringes for discharging the paint, and the paint is discharged alternately from the pair of syringes, so that the discharged paint is interrupted. Without this, it is possible to discharge the paint continuously.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a paint supply apparatus for a coating apparatus according to the present invention, a piston rod is inserted into each of a pair of syringes, and a movable plate is connected to the inserted piston rod. Then, a servo motor is connected to each of the movable plates, and by driving the servo motor, the movable plate is moved, whereby the piston rod can be moved in the syringe.

Further, each of the pair of syringes is connected to a paint suction / inlet means for sucking paint into the syringe and sucking paint sucked into the syringe.

Further, the servo motor and the paint inlet / outlet means are electrically connected to a controller, and the controller can control the operation of the paint inlet / outlet means and the servo motor.

When the paint is supplied using the paint supply device for a coating device of the present invention configured as described above, the inner diameter of the syringe, the discharge amount of the paint, The number of rotations of the servo motor and the like based on are set in advance.

In the next paint suction and discharge step, after the paint is sucked into one syringe, one servomotor is driven to feed the piston rod inserted into one syringe. While the paint is discharged from one syringe, the paint is sucked into the other syringe and kept in a standby state.

At the same time when the discharge amount of the paint by one syringe reaches a predetermined amount, the discharge of the paint by one syringe is stopped, and the other servomotor is driven, so that the inside of the other syringe is The inserted piston rod is fed to discharge the paint from the other syringe.

Further, while the paint is being discharged by the other syringe, the paint is sucked into one of the syringes, and at the same time when the discharge amount of the paint by the other syringe reaches a predetermined amount, the other syringe is discharged. The operation of stopping the discharge of the paint from the syringe and simultaneously driving the one servo motor to feed the piston rod inserted into the one syringe and discharge the paint from the one syringe is repeated. . As described above, when the paint is supplied using the paint supply device for a coating device of the present invention, the supply of the paint from the pair of syringes is performed alternately.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a paint supply device for a coating apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a configuration of a paint supply apparatus for a coating apparatus according to the present embodiment. In the drawing, reference numeral 1 denotes a paint supply device for a coating device according to the present embodiment.

The paint supply device 1 for a coating device according to this embodiment is provided with a pair of syringes 2 and 3 in which piston rods 4 and 5 are movable in the syringes 2 and 3 respectively. It is freely inserted.

Movable plates 6, 7 are connected near the lower ends of the piston rods 4, 5, and the movable plates 6, 7 are screwed onto screw screws 8, 9, whereby By rotating the screw, the movable plates 6 and 7 can move up and down on the screw 8 and 9.

Further, the screw screws 8 and 9 are connected to servo motors 10 and 11, respectively.
By driving 0 and 11, the screw screws 8 and 9 rotate.

For this purpose, in the paint supply apparatus 1 for a coating apparatus according to the present embodiment, the screw screws 8 and 9 are screwed by driving the servo motors 10 and 11 to rotate the screw screws 8 and 9. Movable plates 6, 7
Is movable, whereby the piston rods 4 and 5 can be sent in the syringes 2 and 3, whereby the paints 18 and 19 in the syringes 2 and 3 can be discharged from the syringes 2 and 3. For this reason, unlike the conventional case where paint is supplied using a pressurized feed tank, as in the conventional painting equipment, a fixed amount of paint can be discharged regardless of the position of the spray gun, so the amount of paint discharged from the syringe can be accurately grasped. And a desired amount of paint can be reliably discharged.

In the drawings, reference numerals 14 and 15 denote motor chambers. In this embodiment, the internal pressure explosion-proof system is adopted for the motor chambers 14 and 15 to prevent accidents.

The servo motors 10, 11 are
It is electrically connected to a control unit (not shown), and by inputting the inner diameters of the syringes 2 and 3 and the discharge amount of the paint and the rotation speeds of the servo motors 10 and 11 based on them in advance, the control unit Connect the piston rods 4, 5 to the syringe 2,
3 allows accurate delivery of the desired amount of paint.

In the drawings, reference numerals 12 and 13 denote gears for controlling the rotation of the servo motors 10 and 11.

In the figures, reference numerals 16 and 17 denote the suction of paint into the syringes 2 and 3 and the syringes 2 and 3 respectively.
It is a paint suction / inlet means for discharging paint more, and is attached to the tip of each of the syringes 2 and 3.

FIG. 2 is a view showing the structure of the one syringe 2 when viewed from the side, and FIG.
FIG. 3 is an enlarged view of the paint suction / inlet means 16 in FIG. 2.

As shown in the drawing, the paint suction / inlet means 16 in the present embodiment employs a paint suction cylinder 1.
601 and a cylinder 1602 for discharging paint.
The tip of each of the cylinders 1601 and 1602 communicates with the syringe 2 via a tube 1605.

The paint suction cylinder 160
Pistons 1603 and 1604 are movably inserted into a cylinder 1 and a paint discharging cylinder 1602, respectively.

The distal ends of the pistons 1603 and 1604 can be brought into contact with the distal ends of the paint suction cylinder 1601 and the paint discharge cylinder 1602, and the other ends of the pistons are provided by springs 1606 and 1607. It is supported in 1601 and 1602.

Further, in the figure, reference numerals 1608 and 1609 denote air chambers. Air pipes 1610 and 1611 for injecting air are inserted into the air chambers 1608 and 1609, and the air chambers 1608 and 1611 are inserted through the air pipes 1610 and 1611. , 16
09 into the piston 160 by injecting air.
3, 1604 can be raised. In a normal state, the distal ends of the pistons 1603 and 1604 abut against the distal ends of the cylinders 1601 and 1602 by the elastic force of the springs 1606 and 1607, and the pipe 1
The communication between the cylinder 605 and the cylinders 1601 and 1602 is interrupted.
By raising 604, the pipe 1605 can communicate with the cylinders 1601 and 1602.

Further, the cylinders 1601, 160
Partitions 1612 and 1613 are provided in the vicinity of the distal end of 2, and more distally than the partitions 1612 and 1613.
That is, a nozzle 1614 for feeding paint to the syringe 2 and a nozzle 1615 for discharging paint from the syringe 2 are connected to the pipe 1605 side, respectively.

The other end of each of the air pipes 1610 and 1611 is provided with air injection means such as an air cylinder, and the air injection means is electrically connected to the control unit, and the operation of the air injection means is controlled. Section is controlled. The other end of the paint suction nozzle 1614 is connected to a tank or the like storing the paint, and the other end of the paint discharge nozzle 1615 is connected to a spray gun for spraying the paint to the workpiece. It is connected.

The paint suction / inlet means 16 used in this embodiment
Is configured as described above. When paint is sucked into the syringe 2, air is injected into the air chamber 1608 from the air pipe 1610 by operating an air injection means such as an air cylinder to cause the piston 1603 to move. To raise. Thereby, the contact between the tip of the piston 1603 and the tip of the cylinder 1601 is released, and the paint is fed into the cylinder 1601 via the paint suction nozzle 1614. Then, the paint fed into the cylinder 1601 from the paint suction nozzle 1614 passes through the pipe 1605 from the tip of the cylinder 1601 to the syringe 2.
Inhaled into.

After a predetermined amount of paint is sucked into the syringe 2, the air in the air chamber 1608 is released to lower the piston 1603, and the piston 1
The distal end of the cylinder 603 is brought into contact with the distal end of the cylinder 1601 to cut off the communication between the cylinder 1601 and the pipe 1605.

On the other hand, when the paint in the syringe 2 is to be discharged, the air injection means such as an air cylinder is also operated, so that the air enters the air chamber 1609 in the discharge cylinder 1602 via the air pipe 16111. To raise the discharge piston 1604. As a result, the discharge cylinder 1603 and the pipe 1605 communicate with each other. In this state, by driving one of the servo motors 10 to feed the piston rod 4 inserted into the syringe 2, the pipe 1605 and the pipe 1605 are discharged. The paint in the syringe 2 can be discharged via the cylinder 1603. Then, when the discharge is stopped, only the air in the air chamber 1609 needs to be released.

It should be noted that the above description has been made with respect to one syringe 2
Although the description has been given of the paint discharging and inserting means mounted on the other syringe 3, the same applies to the configuration of the paint discharging and inserting means mounted on the other syringe 3. Therefore, by interlocking the movement of the four pistons with the driving of the servomotors 10 and 11, it is possible to continuously discharge the paint from the syringes 2 and 3.

FIG. 4 is a block diagram showing a control system for operating the paint supply device 1 for the coating apparatus of the present embodiment. Piston rod 4, inserted into 2, 3,
Servo motors 10 and 11 for feeding the piston 5 are electrically connected to the control unit, thereby automatically controlling the feeding of the piston rods 4 and 5 so that a desired amount of paint can be accurately discharged from the syringes 2 and 3. Discharge is possible.

In addition, the suction air cylinders A and B serving as air injection means for operating the paint suction piston and the paint discharge piston in the paint suction and discharge means mounted on the syringes 2 and 3, respectively, and discharge. The air cylinders A and B are also electrically connected to the control unit, so that the suction of the paint into the syringe and the discharge of the paint from the syringe can be automatically controlled. Therefore, in the paint supply device for a coating device of the present embodiment, the servo motor 1
By controlling the driving of the cylinders 0 and 11 and the driving of the suction air cylinders A and B and the discharge air cylinders A and B, the discharge amount of the paint can be accurately set to a desired amount, and the syringe 2 , 3 and the discharge of the paint from the syringes 2, 3 can be performed alternately, thereby preventing the discharged paint from being interrupted.

In addition, as shown in FIG.
The control unit is electrically connected with a memory unit for storing the preset inner diameters of the syringes 2 and 3, an operation panel, and a power supply.

A method for supplying a paint using the paint supply device for a coating apparatus according to the present embodiment configured as described above will be described with reference to a flowchart of FIG. When the paint is supplied by the device paint supply device, first, in the initial setting stage,
The internal diameter of the syringe and the like are stored in the memory unit, the amount of paint to be discharged from the syringe is set in advance, and the rotation speed of the servo motor is determined based on the inner diameter of the syringe and the amount of paint discharged. Etc. are set (initial setting).

In the step of inhaling and discharging the paint,
The suction of the paint into one of the syringes 2 is started, and after the suction of a predetermined amount of the paint is completed, the suction cylinder 1 is stopped.
Air is released from the air chamber 1608 of the 601 to lower the piston 1603, and the discharge cylinder 16
Air is injected into the air chamber 1609 of 02 to raise the piston 1604 in the discharge cylinder 1602 to prepare for discharge.

Thereafter, the servo motor 10 for feeding the piston rod 4 inserted into the syringe 2 is driven, and the discharge of the paint from the syringe 2 is started.

Then, the servo motor 10 is driven to discharge the paint from the syringe 2 until the discharge amount of the paint from the syringe 2 reaches a preset value, and the discharge amount of the paint reaches the preset value. Sometimes, servo motor 10
Is stopped to stop the discharge from the syringe 2, and the air in the air chamber 1609 of the discharge cylinder 1602 is released to lower the piston 1604.

On the other hand, while the paint is being discharged from one syringe 2, the suction of the paint into the other syringe 3 is started, and the suction is stopped when the suction of the predetermined amount of paint is completed. And wait. Then, the discharge of the paint from one syringe 2 is stopped, and at the same time, the discharge of the paint from the other syringe 3 is started.

Further, while the paint is being discharged from the other syringe 3, the paint is sucked into one syringe 2 and kept in a standby state, and the discharge of the paint from the other syringe 3 is set in advance. When the amount reaches the amount, the discharge of the paint from the other syringe 3 is stopped, and at the same time, the discharge of the paint from the one syringe 2 is started. Thereafter, this operation is repeated, and one syringe 2 and the other syringe 3
The discharge of the paint from is performed alternately.

As described above, the method for supplying paint for a coating apparatus of the present invention employs a method of discharging paint by using a pair of syringes alternately, so that paint can be supplied continuously. Becomes

At this time, since the feed of the piston rod in the syringe is controlled by using a servomotor, the discharge amount of paint can be accurately grasped, and the desired amount of paint can be discharged accurately. It is possible to eliminate unevenness of the paint on the object to be coated.

[0050]

The paint supply apparatus for a coating apparatus and the paint supply method using the same according to the present invention are implemented in the form described above, and have the following effects.

A paint supply device for a coating device according to the present invention is a paint supply device for a coating device for supplying a paint to a spray gun for spraying a paint toward an object to be coated in the coating device. A piston rod movably inserted into the pair of syringes, a movable plate connected to the piston rod, a servo motor for moving the movable plate, and a tip mounted on the pair of syringe distal ends. A paint suction and discharge means for supplying paint into the pair of syringes and discharging paint from the syringe, and a control means for controlling the operation of the paint suction and discharge means and the servomotor, By driving the servo motor, the piston rod can be moved in the syringe.

When the paint is supplied by using this, in the initial setting, the inner diameter of the syringe, the discharge amount of the paint, and the rotation speed of the servo motor based on them are set in advance. In the step, after the paint is sucked into one syringe, the paint is discharged from the one syringe that has drawn the paint, and the paint is sucked into the other syringe, and the discharge amount of the one syringe is set in advance. As soon as the set value is reached, the discharge of the paint by one syringe is stopped and the suction of the paint is started, while the discharge of the paint by the other syringe is started and the discharge of the paint by the other syringe is performed. Then, the operation of sucking the paint into one of the syringes is repeated.

As described above, in the coating material supply apparatus for a coating apparatus of the present invention, the movable plate is connected to the piston rod inserted into the syringe, and the movable plate is moved by the servo motor. Is controlled by the control unit, so that the feed amount of the piston can be accurately controlled, as a result, the discharge amount of the paint can be accurately grasped, and the desired amount of paint can be accurately discharged from the syringe. This makes it possible to prevent paint unevenness on the object to be coated.

Further, in the paint supply method using the paint supply device for a coating device of the present invention, the paint is discharged alternately from a pair of syringes, so that only a desired amount of paint can be reliably discharged. In addition, it is possible to continuously discharge the paint without interrupting the paint to be discharged.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of an embodiment of a paint supply device for a coating device of the present invention.

FIG. 2 is a diagram showing a configuration of a syringe used in an embodiment of a paint supply device for a coating device of the present invention when viewed from a side.

FIG. 3 is a diagram for explaining a paint suction / inlet means used in an embodiment of a paint supply device for a coating device of the present invention.

FIG. 4 is a diagram showing a control system of an embodiment of a paint supply device for a coating device of the present invention.

FIG. 5 is a flowchart for explaining a paint supply method using the paint supply device for a coating device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 paint supply device for coating device 2, 3 syringe 4, 5 piston rod 6, 7 movable plate 8, 9 screw screw 10, 11 servo motor 12, 13 gear 14, 15 motor room 16, 17 paint suction / injection means

Claims (2)

[Claims] 1. A paint supply device for a coating device for supplying a paint to a spray gun for spraying the paint toward an object to be coated in the coating device, comprising a pair of syringes (2, 3).
A piston rod (4, 5) movably inserted into the pair of syringes (2, 3); a movable plate (6, 7) connected to the piston rod (4, 5); Servo motors (10, 10) for moving the movable plates (6, 7)
11) to supply the paint into the pair of syringes (2, 3) and discharge the paint from the syringes (2, 3), which are mounted on the tip portions of the pair of syringes (2, 3). The paint suction / inlet means (16, 17), the paint suction / inlet means (16, 17) and the servomotor (10, 1).
Control means for controlling the operation of 1), and by driving the servomotors (10, 11),
The piston rod (4, 5) is connected to the syringe (2,
3) A paint supply device for a coating device, wherein the paint supply device is movable within the range. 2. A paint supply method using the paint supply device for a coating device according to claim 1, wherein, in an initial setting, an inner diameter of the syringe (2, 3), a discharge amount of the paint, and a discharge amount of the paint are determined in advance. The rotation speed of the servo motors (10, 11) is set in advance, and in the next step, after the paint is sucked into one syringe (2), the other syringe (2) sucks the paint. The paint is discharged into the other syringe (3) at the same time as the paint is discharged. At the same time when the discharge amount of the one syringe (2) reaches a preset value, the discharge of the paint by the one syringe (2) is started. Stopping and starting suction of the paint, discharge of the paint by the other syringe (3) is started, and while the discharge of the paint by the other syringe (3) is being performed, the paint is contained in one syringe (2). Inhale, Paint supply method characterized by repeating the operation mentioned.