JP4462880B2 - Coating machine - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a coating machine in which a coating material is pre-filled and a coating material press-out chamber is formed that presses against an atomization mechanism during coating, and in particular, electrostatic spraying of a conductive coating material such as an aqueous coating material. It is suitable for application to an electrostatic coating machine.

  In automobile body painting, paints using organic solvents are the mainstream, but from the viewpoint of environmental protection and pollution prevention, it is required to reduce volatile organic solvents generated in large quantities in the painting process. As a result, painting with water-based paint has attracted attention.

  In order to use water-based paint without waste, it is preferable to apply with an electrostatic coating device with high coating efficiency. However, water-based paint has low electrical resistance, and the electrostatic coating machine uses paint that flows through the paint supply system. Since the rotary atomizing head and the ground side are easy to conduct, it is necessary to take insulation measures for the entire paint supply system to prevent leakage of a high voltage of −60 to 90 kV applied to the rotary atomizing head.

For this reason, conventionally, a paint tank formed in the coating machine is filled with paint, or a cartridge that is detachably attached to the coating machine is filled with paint, and the paint is pressed out from the paint tank or cartridge for painting. Thus, the coating material supply system is electrically cut off so that no leakage occurs even when a high voltage is applied to the coating machine.
JP 2000-317354 A

  In such a type of electrostatic coating machine, a bottom plate serving as a piston is usually slidable along the inner peripheral surface of a paint tank or cartridge serving as a cylinder, and the bottom plate is pressed by another actuator or hydraulic pressure. The paint is pressed out.

However, in this case, since the bottom plate and the inner peripheral surface must be securely sealed, the friction increases accordingly and a large driving force is required.
Each time the bottom plate reciprocates, the seal rubs and wears, so in the case of hydraulic drive, the operating station may flow in and adversely affect the coating quality.

  In addition, the normal seal has a structure in which a plurality of O-rings are arranged in parallel on the outer peripheral surface of the bottom plate that serves as a piston, so that paint enters between the O-rings and the O-rings, and the daily work is performed. When the cleaning is completed, the bottom plate must be removed and disassembled for cleaning.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a coating material filling type coating machine capable of reliably pressing out paints and other coating materials with a small driving force without sliding the bottom plate, and removing the bottom plate and performing disassembly and cleaning. Is a technical issue.

In order to solve this problem, the present invention provides a coating machine provided with a coating material press-out mechanism that pre-fills a coating material and presses it against an atomizing mechanism.
The coating material pressurizing mechanism is provided with a coating material bag for filling the coating material in a predetermined volume of the coating material pumping chamber filled with a pressure transmission liquid or a working liquid ,
The coating agent bag is formed in a tube shape or a balloon shape having a connection port on one end side, and the connection port is detachably connected to a coating agent inflow / outflow port formed in the coating agent pressurizing chamber,
The coating agent pressurizing chamber is provided with an inflow / outflow port for a working fluid that pressurizes the coating material by applying pressure from the outside of the coating material bag.

  In the coating machine according to the present invention, the coating material pressure chamber is partitioned by the coating material bag and the working fluid bag, and the working fluid bag is filled with a coating material such as a coating material in advance. If, for example, a constant amount is introduced, the hydraulic fluid bag expands due to the fluid pressure, the coating material bag is crushed, the coating material is squeezed out quantitatively, and supplied to the atomizing mechanism.

In this way, by supplying the working fluid, the coating material bag can be crushed and the coating material can be pressed out, so that the pressure of the working fluid acts on the coating material as it is and presses the coating material with a relatively small driving force. There is an effect that it can be put out.
In addition, since it is not necessary to slide the bottom plate, there is no coating failure due to seal leakage of the bottom plate, and there is no gap for the coating material to enter, so that cleaning can be easily performed.
Furthermore, even if one of the bags may break during use, the coating material bag and the working fluid bag are provided separately, so the coating material and the working fluid are mixed in the coating material pressurizing chamber. There is no risk of doing so.

The object of the present invention is to eliminate the bottom plate serving as a piston so that the paint or other coating material can be reliably pressed out with a small driving force and can be cleaned without being disassembled.
Hereinafter, the coating machine according to the present invention will be specifically described with reference to the drawings.
FIG. 1 is a sectional view showing a coating machine according to the present invention, and FIG. 2 is an explanatory view showing another embodiment.

  An electrostatic coating machine (applicator) 1 shown in FIG. 1 performs electrostatic coating of a conductive paint (coating material) such as a water-based paint. A head (atomization mechanism) 3 is arranged, and a cartridge 4 on which a coating material press-off mechanism P for pressing a pre-filled paint with hydraulic fluid pressure is detachably mounted on the rear end side. ing.

  The rotary atomizing head 3 is attached to a tubular rotary shaft 6 of an air motor 5 disposed in the airframe 2 and is driven to rotate at high speed, and a high voltage supplied from a high voltage generator 7 is applied to the rotary atomizing head 3. The applied paint particles are charged on the opposite side of the object to be coated.

  The coating material pressurizing mechanism P has a paint inflow / outflow port 9a and a hydraulic fluid inflow / outflow port 10a formed in a paint (coating material) pressure chamber 8 having a predetermined volume, and a paint bag for filling the paint into the paint inflow / outflow port 9a. 9 and the hydraulic fluid inflow / outflow port 10a are detachably attached to the hydraulic fluid bag 10 for coating material discharge.

The paint bag 9 and the hydraulic fluid bag 10 are formed in a tube shape or a balloon shape in which a connection port is formed on one end side, and the respective connection ports are connected to the respective inflow / outflow ports 9a and 10a.
As a result, the hydraulic fluid bag 10 is inflated by the hydraulic fluid flowing in from the machine body 2 through the hydraulic fluid inflow / outflow port 10a, and pressure is applied from the outside of the coating material bag 9. The bag 9 is crushed and the paint is pressed out.

The paint press-out chamber 8 is formed on the inner peripheral surface of the cylinder, and the outside of the coating material bag 9 and the working fluid bag 10 applies the pressure of the working fluid flowing into the working fluid bag 10 to the coating material bag. 9 is filled with a pressure transmission fluid to be transmitted to
As the pressure transmission liquid, hydraulic fluid or thinner is used. In this example, the same butyl acetate as the hydraulic fluid is used.
Further, since the paint is filled in the paint bag 9, the paint bag 9 does not adhere to the coating material press-out chamber 8, and the paint bag 9 can be cured even if the paint that could not be cleaned is cured in the paint bag 9. It is sufficient to replace it, and maintenance is very easy.

  Further, in this example, each of the bags 9 and 10 is selected to have a size and volume substantially equal to those of the paint press-out chamber 8, so that when the paint bag 9 is filled with the paint, the hydraulic fluid bag 10 is When the hydraulic fluid bag 10 is almost empty and the hydraulic fluid is filled, the paint bag 9 is substantially empty.

When the cartridge 4 is mounted on the body 2, the joints 11 </ b> A and 11 </ b> B are engaged, and the flow paths of both the body 2 and the cartridge 4 are communicated.
In the machine body 2, a paint supply flow path 12 that supplies the paint pressed out from the paint bag 9 to the rotary atomizing head 3 and a hydraulic fluid flow path 13 that supplies / discharges the hydraulic fluid to / from the hydraulic fluid bag 10. In the joint 11A, connection ports 12a and 13a with stop valves are formed which open the flow paths 12 and 13 only when engaged with the cartridge-side joint 11B.
Similarly, the cartridge 4 is formed with a paint flow path 14 communicating with the paint bag 9 and a hydraulic fluid flow path 15 communicating with the hydraulic fluid bag 10, and the joint 11B includes a joint 11A on the airframe 2 side. And connection ports 14a and 15a with stop valves that are opened when the flow paths 14 and 15 communicate with the flow paths 12 and 13, respectively.

  Reference numeral 21 denotes a cleaning flow path for cleaning the inside of the coating machine 1 and the rotary atomizing head 3, and a connection port 12 a of the paint supply flow path 12 from a cleaning connector connection port 22 formed on the peripheral surface of the machine body 2. When the joints 11A and 11B are in a non-engaged state, they communicate with the paint supply flow path 12 through the connection port 12a.

The above is one configuration example of the present invention, and the operation thereof will be described next.
Various operating air pipes, exhaust pipes, and power cables (not shown) are connected to the body 2 of the electrostatic coating machine 1, and the electrostatic coating machine 1 is attached to a weaving arm such as a painting robot (not shown). Install.

  Then, the cartridge 4 in which the paint bag 9 is pre-filled with the paint is mounted on the machine body 2 and the joints 11A and 11B are engaged to move the coating machine 1 to an arbitrary painting position, and at the same time, the rotary atomizing head. 3 is driven to rotate at high speed by the air motor 5, and the high voltage generator 7 is turned on to apply a high voltage.

  Here, when the working fluid is supplied to the cartridge 4 in a fixed amount from the machine body 2 side, the working fluid bag 10 expands and the paint bag 9 is crushed between the working fluid bag 10 and the inner wall of the paint press-out chamber 8. Is quantitatively supplied through the paint supply channel 13 and electrostatically atomized by the rotary atomizing head 3.

According to this example, instead of sliding the paint tank and the bottom plate of the cartridge to press the paint as in the prior art, the paint bag 9 is crushed by flowing the working fluid into the working fluid bag 10 to remove the paint. Since the pressure can be discharged, the pressure of the working fluid acts on the paint as it is, and there is an effect that the paint can be pressed out with a relatively small driving force.
In addition, since the paint is filled in the paint bag 9 and completely separated from the working fluid, it is not necessary to provide a seal for preventing them from mixing with each other, and poor coating due to seal leakage occurs. Further, there is no wrinkle, and furthermore, there is no gap for the paint to enter, so there is an effect that cleaning can be easily performed.

FIG. 2 is an explanatory view showing another embodiment according to the present invention. The same parts as those in FIG.
In the electrostatic coating machine (coating machine) 41 of this example, the paint inflow / outflow ports 9a to 9d and the hydraulic fluid inflow / outflow port 10a are formed in the paint pressurizing chamber 8 of the cartridge 43 attached to the machine body 42. A plurality of paint bags 9A to 9D for individually filling the outflow ports 9a to 9d with water-based paints of respective colors are attached, and a working fluid bag 10 for paint extruding is attached to the working fluid inflow and outflow ports 10a. ing.

The paint bags 9A to 9D and the hydraulic fluid bag 10 are formed in a tube shape or a balloon shape in which a connection port is formed on one end side, and the respective connection ports are connected to the respective inflow / outflow ports 9a to 9d and 10a, Two coating material bags 9A to 9D are arranged on each side of the hydraulic fluid bag 10 so as to sandwich the hydraulic fluid bag 10 therebetween.
Also, each of the paint bags 9A to 9D is selected to have a volume that is approximately ¼ of the paint press-out chamber 8, and the hydraulic fluid bag 10 is provided with a paint pressure so that all the paint bags 9A to 9D can be emptied. The volume is selected to be approximately the same as the exit chamber 8.

Both the flow paths of the airframe 42 and the cartridge 43 are communicated via joints 44A and 44B.
The machine body 2 includes a paint supply flow path 12A to 12D that feeds the paint discharged from the paint bags 9A to 9D to the rotary atomizing head 3, and a rotary atomization of the paint supply flow paths 12A to 12D when the paint is discharged. On-off valves 45 </ b> A to 45 </ b> D that are selectively conducted to the head 3, and a hydraulic fluid channel 13 that supplies / discharges hydraulic fluid to / from the hydraulic fluid bag 10 are formed.
In the joint 44A on the airframe 42 side, connection ports 12a to 12d and 13a with stop valves that are opened only when engaged with the joint 44B on the cartridge 43 side are provided at the tips of the flow paths 12A to 12D and 13, respectively. Is formed.

In addition, the cartridge 43 is formed with paint passages 14A to 14D communicating with the paint bags 9A to 9D and a working fluid passage 15 communicating with the working fluid bag 10.
The joint 43B on the cartridge 43 side has connection ports 14a-14d, 15a with stop valves that are opened only when engaged with the joint 44A on the airframe 42 side, at the tips of the flow paths 14A-14D, 15. Is formed.

  Reference numerals 21A to 21D denote cleaning flow paths for cleaning the inside of the coating machine 1 and the rotary atomizing head 3, and the paint supply flow path 12A from the cleaning connector connection ports 22A to 22D formed on the peripheral surface of the machine body 2. When the joints 44A and 44B are in the non-engaged state, they communicate with the paint supply channels 12A to 12D through the connection ports 12a to 12d.

In the case of this example, since a plurality of paint bags 9A to 8D are arranged, the present invention can be applied to multicolor color change coating.
In addition, since the pressure of the hydraulic fluid acts on the paint as it is, the paint can be pushed out with a relatively small driving force, there is no risk of paint failure due to seal leakage, and there is a seal gap where paint enters. The effect that the cleaning can be easily performed is the same as that of the above-described embodiment.

  In each of the above embodiments, the case where the present invention is applied to an electrostatic coating machine for conductive paint has been described. However, the present invention is not limited to this, and the electrostatic coating gas of a normal non-conductive paint is not limited. It can also be applied to air atomizers.

  As described above, the present invention is very useful when used in an electrostatic coating machine for conductive paints.

Sectional drawing which shows an example of the filling-type coating device which concerns on this invention (Example 1). The fluid circuit diagram which shows another Example (Example 2).

Explanation of symbols

1, 41 Electrostatic coating machine (coating machine)
2, 42 Airframe 3 Rotating atomizing head (Atomization mechanism)
P Coating material pressurizing mechanism 4, 43 Cartridge 5 Air motor 6 Tubular rotating shaft 7 High voltage generator 8 Paint (coating material) pressurizing chamber 9 9A to 9D Paint bag 10 Working fluid bag 10a Working fluid inflow / outflow port

Claims (5)

In a coating machine equipped with a coating material press-out mechanism that pre-fills the coating material and presses it against the atomization mechanism,
The coating material pressurizing mechanism is provided with a coating material bag for filling the coating material in a coating material pumping chamber of a predetermined volume filled with a pressure transmission liquid or a working liquid ,
The coating bag is formed in a tube shape or a balloon shape in which a connection port is formed on one end side, and the connection port is detachably connected to a coating agent inflow / outflow port formed in the coating agent pressurizing chamber,
The applicator pressurizing chamber is provided with an inflow / outflow port for a working fluid that pressurizes the coating material by applying pressure from the outside of the coating material bag.   A plurality of coating material bags are provided in the coating material pressurizing chamber, and the spraying flow from one coating material bag to the coating material pumping passage extending from each coating material bag to the atomizing mechanism is performed from one coating material bag. 2. The coating machine according to claim 1, further comprising a switching valve for selectively supplying a coating material to the mechanism. A working fluid bag is provided to allow the working fluid for dispensing the coating material to flow into the coating material dispensing chamber, and the working fluid bag is formed in a tube shape or a balloon shape having a connection port on one end side, The connection port is detachably connected to the inflow / outflow port of the working fluid formed in the coating agent pressurizing chamber, and the outer side of the coating material bag and the working fluid bag arranged in the paint pressurizing chamber is the working fluid bag. 3. The applicator according to claim 1 , wherein the applicator is filled with a pressure transmission liquid that transmits the pressure of the flowing hydraulic fluid to the coating material bag . The coating machine according to any one of claims 1 to 3, wherein an inner side of the coating material pressing chamber is formed on a cylindrical inner peripheral surface. Conductive paint such as an aqueous paint is used as the coating material, the electrostatic atomizing mechanism for charging the paint particles which are sprayed as the atomizing mechanism in the opposite polarity as the object to be coated becomes is provided according to claim 1 to 4 Any one of the coating machines.

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