JP4462987B2 - Coating machine - Google Patents

Description

  The present invention relates to a coating machine provided with a coating material press-out mechanism that presses a pre-filled coating material against an atomizing mechanism, and more particularly to an electrostatic coating machine that electrostatically atomizes conductive paint such as water-based paint. It is suitable for application.

  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.

  Accordingly, the present invention provides a coating material filling type coating machine capable of reliably pressing out coating materials and other coating materials with a small driving force without sliding the bottom plate, and having no troublesome work of removing and cleaning the bottom plate. This is a technical issue.

In order to solve this problem, the invention of claim 1 is a coating machine provided with a coating material pressure-out mechanism that presses a pre-filled coating material against an atomization mechanism. A coating material bag for filling the coating material and a coating material bag for filling the coating material into a predetermined volume of the coating material inflow / outflow port formed with the coating material inflow / outflow port and the working station inflow / outflow port. A working fluid bag that pressurizes the coating material by applying pressure is arranged in contact with each other, and the coating material bag and the working fluid bag are connected to the coating material inflow / outflow port and the working station inflow / outflow port. The application material bag and the working fluid bag are formed in a tube shape having a mouth, and at least a part of the contact surfaces are constrained to each other so that the contact surfaces do not shift in position . Gap There characterized in that it is filled with a pressure transmission fluid for transmitting the pressure of the hydraulic fluid bag coating material bag.

In the applicator of claim 2, the inside of the coating material press-out chamber of claim 1 is formed on the inner peripheral surface of the cylinder.
In the applicator of claim 3, a conductive paint such as a water-based paint is used as the coating material, and an electrostatic atomizing mechanism is used in which the paint is atomized and charged to the opposite electrode to the object to be coated.

  In the coating machine according to claim 1, the coating material pressure chamber is partitioned by the coating material bag and the working fluid bag, and the working fluid bag is operated in a state where the coating material bag is previously filled with a coating material such as paint. When the liquid is allowed to flow in, for example, in a fixed amount, the hydraulic fluid bag expands due to the liquid pressure and the coating material bag is crushed, and the coating material is pressed out in a fixed amount and supplied to the atomizing mechanism.

In this way, by supplying the working fluid, the coating material bag is crushed and the coating material is pushed out, so the pressure of the working fluid acts on the coating material as it is, and the coating material is atomized with a relatively small driving force. There is an effect that it can be supplied to the mechanism.
In addition, since the bottom plate that serves as the piston is not used, there is no gap between the bottom plate and the coating material press-out chamber so that the coating material does not enter, and cleaning can be performed easily. There is no effect.
Furthermore, even if the hydraulic fluid bag may be torn during use, the coating material is filled in the coating material bag, so that the coating material and the hydraulic fluid may be mixed in the coating material pressurizing chamber. Absent.

  Furthermore, since at least a part of the coating material bag and the working fluid bag are restrained from each other so that the contact surfaces do not shift, repeated filling and discharging of the coating material and inflow and outflow of the working fluid are repeated. However, when the coating material bag and the working fluid bag are alternately inflated or crushed, their movements are restrained, and the two bags are deformed integrally.

  Thus, for example, only the coating material bag is driven to one corner of the coating material press-out chamber, and only the coating material bag is not squeezed thereby, and the contact surface between the coating material bag and the working fluid bag is one sheet. Since it reciprocates in the coating material press-out chamber like a diaphragm, there is an effect that each bag is unlikely to become a bag or torn.

According to the applicator of claim 2, the gap between the coating material bag and the hydraulic fluid bag of claim 1 is filled with the pressure transmission liquid that transmits the pressure of the hydraulic fluid bag to the coating material bag. The supply amount of hydraulic fluid is equal to the discharge amount of the coating material.
According to the applicator of claim 3, since the inside of the coating material press-out chamber of claim 1 is formed on the cylindrical inner peripheral surface, the coating material bag and the hydraulic fluid bag are pressed against the coating material press-out chamber. There is no crease.
According to the applicator of claim 4, when the conductive paint such as water-based paint is electrostatically atomized by the electrostatic atomization mechanism as the coating material, the coating material is filled in the coating material bag. Therefore, no high voltage leaks to the outside, and it is not necessary to take insulation measures for the paint supply system.

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 cross-sectional view showing an example of a coating machine according to the present invention, FIG. 2 is an explanatory view showing the operation of a paint press-out mechanism, FIG. 3 is a comparative example thereof, and FIG. 4 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 (atomizing mechanism) 3 is arranged, and a paint (coating material) ejecting mechanism P that pumps out a pre-filled paint with hydraulic pressure of the working fluid and supplies it to the rotary atomizing head 3 on the rear end side. A cylindrical cartridge 4 having the above is detachably mounted.

  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.

In the cartridge 4, the front side of the paint press-out chamber 8 formed on the inner peripheral surface of the cylinder is formed on the lid body 4 </ b> A, and the lid body 4 </ b> A is formed on the joint 11 </ b> B connected to the joint 11 </ b> A on the rear end side of the machine body 2. In addition, a coating material inflow / outflow port 9a for connecting the coating material (coating material) bag 9 to the lid 4A and a working fluid inflow / outflow port 10a for connecting the working fluid bag 10 are formed.
Each port 9a, 10a is formed by a male screw formed in a connection port of each bag 9 and 10 and a male and female socket screwed into a female screw formed in the lid 4A. A stop valve is formed which is opened when mounted on 2 .

  Further, the paint bag 9 and the hydraulic fluid bag 10 are at least partially restrained so that the contact surfaces do not deviate from each other. In this example, both end sides of the bags 9 and 10 are welded. However, the present invention is not limited to this, and the mode is arbitrary, such as bonding one or a plurality of the center of the joint surface, or bonding the front surface.

In the paint pressurizing chamber 8, the gap between the coating material bag 9 and the hydraulic fluid bag 10 is filled with the pressure transmission liquid, so there is no air gap and the pressure of the hydraulic fluid flowing into the hydraulic fluid bag 10 is accurate. To the coating material bag 9, the supply amount of the hydraulic fluid and the discharge amount of the paint can be made equal.
As the pressure transmission liquid, hydraulic fluid or thinner is used. In this example, the same butyl acetate as the hydraulic fluid is used.
Also, the paint is rather name by the coating material extrusion chamber 8 because it is filled in the coating material bag 9, has not been washed paint even be cured in the coating material bag 9, the coating material bag 9 It is sufficient to replace it, and maintenance is very easy.

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.

As a result, the hydraulic fluid bag 10 is inflated by the hydraulic fluid flowing from the hydraulic fluid flow path 13 of 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, and the coating material pressure chamber 8 The inside paint bag 9 is crushed, the paint is pressed out from the paint inflow / outflow port 9 a, and supplied to the rotary atomizing head 3 through the paint supply flow path 12.
That is, the paint pressurizing mechanism P is formed by the flow paths 12 and 13 formed in the cartridge 4 and the machine body 2.

Further, if each of the paint bag 9 and the hydraulic fluid bag 10 is formed in a tube shape having a size and volume substantially equal to the paint press-out chamber 8, the paint bag is filled when the hydraulic fluid bag 10 is filled with the hydraulic fluid. 9 is almost empty, and when the paint bag 9 is filled with the hydraulic fluid, the hydraulic fluid bag 10 is almost empty.
In addition, since the inside of the paint press-out chamber 8 is formed on the inner peripheral surface of the cylinder, the paint bag 9 and the hydraulic fluid bag 10 are not pressed against the paint press-out chamber 8 and creases are not formed.

  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 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.
In this case, even if the conductive paint is used, the paint is filled in the paint bag 9 and is not electrically connected to the outside through the conductive paint, so that a high voltage does not leak. Therefore, it is not necessary to take insulation measures for a paint supply system (not shown) for filling the cartridge 4 with paint.

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.

  Furthermore, since the paint bag 9 and the hydraulic fluid bag 10 are at least partially constrained so that the contact surfaces do not shift in position, the filling and discharging of the paint and the inflow and outflow of the hydraulic fluid are repeated. However, when the paint bag 9 and the hydraulic fluid bag 10 are alternately inflated or crushed, their movements are restricted, and the two bags 9 and 10 are deformed as a unit.

That is, when there is no restriction as in the present invention, as shown in FIGS. 3A to 3C, the paint bag 9 and the hydraulic fluid bag 10 are repeatedly charged and discharged and the hydraulic fluid flows in and out repeatedly. When the bulges are alternately swelled or crushed, only the paint bag 9 is driven to one corner of the paint press-out chamber 8, or only the paint bag 9 is crushed, and each bag becomes a bag or tears. The problem remains that it is easy to do.
However, if at least a part of the paint bag 9 and the hydraulic fluid bag 10 is restrained as in the present invention, the paint bag 9 and the hydraulic fluid bag 10 are shown in FIGS. Since the contact surface of this is reciprocated in the paint press-out chamber 8 like a single diaphragm D, there is an effect that each bag is difficult to become a bag or torn.
At this time, even if the hydraulic fluid bag is torn, the coating material is filled in the coating material bag, so there is no possibility that the coating material and the hydraulic fluid are mixed in the coating material pressurizing chamber. .

In this example, the case in which the mouths of the paint bag 9 and the working fluid bag 10 are arranged in the same direction has been described. However, depending on the structure of the cartridge 4, the mouths of the respective bags 9 and 10 are opposite to each other. It is also possible to arrange them.
Moreover, when restraining the contact surface of each bag 9 and 10, you may restrain not only the case where it adhere | attaches or welds but mutually engaging bags.

FIG. 4 shows an example thereof. In this example, the coating bag 31 and the hydraulic fluid bag 32 are formed with a mouth 34 at the distal end side of the tube 33, and the bottom seal portion 35 inserts the mouth 34 of the other bag. A bent piece having an engagement hole 36 is formed.
According to this, the contact portions 37 of each other are constrained by bending the seal portions 35 of the respective bags 31 and 32 and inserting the respective mouths 34 and 34 into the other engagement holes 36 and 36. .

  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 coating device which concerns on this invention. Explanatory drawing which shows operation | movement of a coating material pressurization mechanism. The comparative example. Explanatory drawing which shows other embodiment.

Explanation of symbols

1 Electrostatic coating machine (coating machine)
2 Airframe 3 Rotating atomization head (Atomization mechanism)
P Paint (Coating Material) Pressing Mechanism 4 Cartridge 5 Air Motor 6 Tubular Rotating Shaft 7 High Voltage Generator 8 Paint (Coating Material) Pressing Chamber 9 Paint (Coating Material) Bag 10 Working Fluid Bag

Claims (3)

In a coating machine equipped with a coating material press-out mechanism that presses a pre-filled coating material against an atomization mechanism,
The coating material pressurizing mechanism is inflated by flowing a coating material bag for coating material and working fluid into a coating material pumping chamber having a predetermined volume in which a coating material inflow / outflow port and an operating station inflow / outflow port are formed. The working fluid bags that pressurize the coating material by applying pressure to the coating material bag are arranged in contact with each other,
The coating material bag and the hydraulic fluid bag are formed in a tube shape having a connection port connected to the coating material inflow / outflow port and the working station inflow / outflow port, and the contact surfaces thereof are not displaced. At least some of which are tied together ,
A coating machine, wherein a gap between the coating material bag and the working fluid bag disposed in the coating material press-out chamber is filled with a pressure transmission liquid that transmits the pressure of the working fluid bag to the coating material bag .   The coating machine according to claim 1, wherein the inside of the coating material press-out chamber is formed on a cylindrical inner peripheral surface. 3. The coating according to claim 1, wherein a conductive paint such as a water-based paint is used as the coating material, and the atomizing mechanism is an electrostatic atomizing mechanism that atomizes the paint and charges the opposite electrode to the object to be coated. Machine.

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