coating machine
coating machine
coating machine
A coating machine having a coating material discharging mechanism for discharging a previously filled coating material under pressure to an atomizing mechanism wherein a coating material bag for filling a coating material is housed in a coating material discharging chamber of a predetermined volume and an inlet/exit port of an operating fluid is disposed for exerting a pressure from the outside of the coating material bag thereby discharging the coating material under pressure, while crushing the coating material gag, whereby paint or like other coating material can be discharged under pressure reliably by a small driving force.
In the coating of car bodies, coating materials using organic solvents are predominant, but it has been demanded to decrease volatile organic solvents that are evolved a great amount in the coating process with a view of environment protection and prevention of public pollution and, as a outer measure, coating with aqueous coating materials has attracted attention.
For using an aqueous coating with no loss, it is preferred to apply coating by an electrostatic coating apparatus of high coating efficiency. However, since the aqueous coating material has low electric resistance tending to electrically conduct the rotary atomizing head and the ground of the electrostatic coating machine by way of a coating material flowing through a coating material supply system, insulation has to be applied over the entire coating material supply system so as to prevent leakage of high voltage of 60 to 90 kV applied to the rotary atomizing head.
Accordingly, a coating material is filled in a coating material tank formed in a coating machine or a coating material is filled in a cartridge mounted detachably to a coating machine and a coating martial is discharged under pressure from the coating material tank or the cartridge for coating thereby electrically shielding the coating material supply system in order not to leak a high voltage even when it is applied to the coating machine (for example, refer to Japanese Unexamined Patent Publication No. 2000-317354).
In the electrostatic coating machine of the type described above, a bottom plate as a piston is slidably located along the inner peripheral surface of a coating material tank or a cartridge as a cylinder and the bottom plate is pushed by other actuator or under a reduced pressure to press-discharge the coating material.
However, since the bottom plate and the inner peripheral surface have to be sealed reliably, friction increases by so much to require a large driving force. Since the seal is worn by friction on every reciprocation of the bottom plate, an operating fluid may possibly enter to give an undesired effect on the quality of the coating in a case of liquid pressure driving.
Further, since plural O-rings are arranged in parallel to the outer peripheral surface of the bottom plate as a piston in the usual seal, the coating material intrudes between each of the O-rings and this imposes a trouble of decomposing and detaching the bottom plate and clean the same upon cleaning after completion of every day's job.
In view of the above, it is a technical subject of the present invention to provide a coating material-filled type coating machine capable of discharging under pressure a paint or like other coating material reliably with a small driving force without sliding movement of a bottom plate and, accordingly, with no trouble of decomposing cleaning by detaching the bottom plate.
The foregoing object of the invention can be attained by a coating machine having a coating material discharging mechanism for discharging a previously filled coating material under pressure to an atomizing mechanism wherein a coating material bag for filling a coating material is housed in a coating material discharging chamber of a predetermined volume, and an inlet/exit port for an operating fluid is disposed for exerting a pressure from the outside of the coating material bag thereby discharging the coating material under pressure.
In the coating machine according to the invention, when a coating material such as a paint is previously filled in a coating material by housed in a coating material discharge chamber and an operating fluid is supplied to the outside of the coating material bag, the operating fluid bag is expanded by the liquid pressure and the coating material bag is crushed by which the coating material is discharged under pressure by a predetermined amount and supplied to the atomizing mechanism.
As described above, since the coating material can be discharged under pressure by supplying the operating fluid thereby crushing the coating material bag, the pressure of the operating fluid is exerted as it is on the coating material and the coating material can be discharged under pressure with a relatively small driving force.
Further, since there is no more required to slide the bottom plate, there is no worry of coating failure caused by the leakage in the seal for the bottom late and since there is no gaps through which the coating material intrude, cleaning can be conducted simply.
In this case, when the coating material bag and the operating fluid bag are housed in the coating material discharge chamber, even when the operating fluid bag should be broken during use, since the coating material is filled in the coating material bag, there is no worry that the coating material and the operating fluid are mixed in the coating material discharge chamber.
In addition, when at least portions of the coating material bag and the operating fluid bag are bound to each other such that the contact faces of the coating bag and the operating fluid bag are not positionally displaced from each other, movement of the coating material bag and the operational fluid bag to each other are restricted when they are expanded or crushed alternately while repeating filling and discharging of the coating material and entry and exit of the operating fluid, whereby the two bags are deformed integrally.
Thus, since the contact faces of the coating material bag and the operating fluid reciprocate as if they were a single sheet of diaphragm in the coating material discharge chamber without forcing only the coating material bag, for example, to the corner of the coating material discharge chamber thereby compressing only the coating material bag, this can provide an advantageous effect that respective bags are less creased or broken.
Further when gaps between the coating material bag and the operating fluid bag are filled with a liquid, the pressure of the operating fluid transfers directly to the coating material bag because of the absence of air gaps, and the amount of the operating fluid supplied and the amount of the coating material discharged are made identical.
Further, when the coating material discharge chamber has a cylindrical inner peripheral surface, the coating material bag and the operating fluid bag are not folded even when they are urged to the coating material discharge chamber.
Furthermore, in a case where a conductive coating material such as an aqueous coating material is electrostatically atomized, as the coating material by an electrostatic atomizing mechanism, since the coating material is filled in the coating material bag, high voltage does not leak by way of the coating material to the outside and there is no requirement for applying insulation countermeasure to the coating material supply system.
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