JPH0256266A - Washing equipment for spray gun of robot for coating - Google Patents

Abstract

PURPOSE:To prevent coating failure by attaching a nozzle for ejecting thinner to a washing cylinder with an inserting port formed to one end while directing it to the inside of the washing cylinder and interposing a pump for forcibly sending thinner between the ejecting nozzle and a recovery tank. CONSTITUTION:After coating is completed, a spray gun 8 is allowed to correspond to a washing cylinder 16 at an oblique attitude wherein an axial line is made coincident therewith by directing the spray gun to a washing equipment 15 side. A pump 30 is driven by a signal sent from a coating robot 1 and thereby thinner stored in a recovery tank 24 is ejected at high pressure through nozzles 27 for ejecting thinner of respective airless guns 25. In this state, when the nozzle extension 10 of the spray gun 8 is slowly inserted into the washing cylinder 16 along the axial line thereof from an inserting port 17, coating stuck to the nozzle extension 10 is blown off by ejecting pressure and thereby the spray gun is washed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a painting robot that supports a spray gun equipped with a paint jetting nozzle so as to be movable in three dimensions. The present invention relates to a cleaning device for removing adhered paint.

Problems to be Solved by the Prior Art and the Invention When performing internal painting, in which paint is applied to the inner peripheral surface of a hollow object, generally a three-dimensional spray gun with a paint jet nozzle attached to the tip is used. A painting robot supported so as to be movable in the direction is used, and when driven by the robot, a spray gun is inserted into the hollow space of the object to be painted and painted. It is inevitable that paint particles floating in the hollow without being applied to the surface will adhere to the outer circumferential surface of the paint jet nozzle, and as the amount of paint particles increases, paint will drop onto the surface to be painted below the paint jet nozzle. In particular, if the paint ejecting nozzle consists of a long and narrow nozzle extension, the paint may drip from the nozzle extension, so stop the work as appropriate during painting and prevent the paint from ejecting. It is necessary to remove the paint adhering to the paint nozzle, and for this reason conventionally cleaning has been done by rubbing the outer periphery of the paint jetting nozzle with a brush or by dipping the paint jetting nozzle in a can containing thinner. However, it was not possible to sufficiently remove the paint adhering to the paint jetting nozzle by such means.

Means for Solving the Problems In the present invention, as a means for solving the above-mentioned problems, a thinner jetting nozzle is attached to a cleaning cylinder having an insertion port formed at one end, facing inside the cleaning cylinder, and the A pump for pumping thinner was interposed between the thinner jetting nozzle and the recovery tank communicating with the cleaning cylinder.

In addition to the thinner jetting nozzle, the cleaning cylinder may be equipped with a pressurized air jetting nozzle facing toward the inside of the cleaning cylinder.

Functions and Effects of the Invention The present invention has the above-mentioned configuration, in which the spray gun with paint adhered to the outer peripheral surface of the paint jetting nozzle during the painting operation is moved from the painting position by the drive of the painting robot and inserted into the cleaning cylinder. When the thinner that is pumped from the collection tank is ejected under high pressure from the thinner ejection nozzle toward the paint ejection nozzle by driving the pump, the paint adhering to the paint ejection nozzle is dissolved by the thinner and blown away by the ejection pressure. It is removed by this. Thereafter, the removed paint is stored together with thinner in a recovery tank. The thinner in the recovery tank is pressurized again by the pump and is forcefully fed to the thinner jetting nozzle. Contaminated thinner is periodically replaced with new thinner as needed, but since this is only for cleaning purposes and the amount of contamination each time is small, there is no problem even if the same thinner is used for a long period of time. does not occur. In addition to the action of dissolving the paint with thinner, the paint is removed from the paint jetting nozzle by the action of blowing the paint away with the force of the thinner, which has the effect of reliably cleaning the paint jetting nozzle. be.

In addition, if a pressurized air jet nozzle is attached to the cleaning cylinder, after cleaning, the pressurized air can be jetted from the pressurized air jet nozzle toward the paint jet nozzle that is wet with thinner. evaporates and quickly dries the paint jetting nozzle, so when painting is restarted, the thinner remaining on the outer surface of the paint jetting nozzle does not dry and drips onto the surface of the object to be painted. This has the effect of preventing paint defects from occurring.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In the figure, reference numeral 1 denotes a coating robot installed near a conveyor 2 that conveys a workpiece a having a hollow space in one direction with its opening C facing to the side. On the top surface of a follower 5 that moves a certain distance following the object 1 to be coated in a direction parallel to the conveyor 2 on a base 4 fixed to a surface 3, a support member 5 is placed on the top surface of a follower 5 that moves a certain distance by following the object 1 to be coated in a direction parallel to the conveyor 2. A main body 6 that moves in the direction of approaching and separating is mounted, and a support 7 is mounted on the top surface of the main body 6 so as to be able to move up and down in the vertical direction, tilt with respect to the vertical line, and rotate around the vertical line. A spray gun 8 includes an elongated nozzle extension 10 having a spout 12 attached to a gun body 9 so as to be rotatable around an axis by a motor (not shown).
is fixed via a support member 11, and by moving the main body 6 while moving the follower 5 at the same speed as the object λ, the nozzle extension 10 of the spray gun 8 is inserted into the hollow of the object a. Then, nozzle extension 1
The paint is atomized and applied to the inner peripheral surface of the object to be painted by spouting the paint toward the outer circumferential side from the paint spouting port I2 while rotating the paint sprayer 0.

A cleaning device 15 is installed near the painting robot i, and on the floor 3, a circular cleaning cylinder is formed with an inspection port 20 having an II21 on the top surface and a chimney-shaped exhaust port 22. I6 is fixed by support legs 18 with its axis oriented diagonally, and this cleaning cylinder 16 has an insertion opening 17 formed in the center of one end face facing diagonally upward, and an insertion opening 17 formed in the center of one end face facing diagonally downward. A recovery tank 24 is formed at the end so as to communicate with the cleaning cylinder I6, and a paint pressure feeding path 26 branched into two is located on the outer periphery of the cleaning cylinder 16 on the side of the insertion port 17.
A plurality of airless guns 25 each have a pair of paint jetting nozzles 27, 27 attached to the tips thereof, each of which has its paint jetting nozzle 27 directed toward the axis of the cleaning cylinder 16, and spaced apart from each other in the circumferential direction. On the other hand, on the side of the cleaning cylinder 16, a pump 30 for pumping thinner whose drive is controlled by signals from the painting robot 1 is arranged on the floor 3, and a pump 30 for pumping thinner is arranged on the floor 3, and a pump 30 for pumping thinner is placed on the side of the cleaning cylinder 16. The recovery tank 24 is connected to the recovery tank 24 via a hose 33 via a υn closing valve 32 attached to its lower end, and the plurality of airless guns 25 are connected to the discharge port 34 via a filter 35 via a hose 36. .

The cleaning tube 16 further includes a dryer 40 having a pressurized air ejection nozzle 4, located near each of the airless guns 25, respectively. These dryers 40 sequentially operate an on-off valve 45, an air regulator 46, an air filter 47, and a shut-off valve 48 whose opening and closing are controlled by signals from the painting robot 1. It is connected via a hose 49 to a pressurized air supply source (not shown).

The present embodiment has the above-mentioned configuration, and when a predetermined number of objects a are coated, the conveyor 2 stops conveying the objects to be painted, and the spray gun with paint attached to the outer periphery of the nozzle extension 10 stops. 8 is a painting robot! The cleaning cylinder 16 is moved away from the conveyance line of the object 1 to be coated by the drive of
When the pump 30 is driven in response to a signal from the painting robot l, the thinner stored in the recovery tank 24 is transferred to the thinner injection nozzle 27 of each airless gun 25. It is ejected at high pressure from
When the nozzle extension 10 of the spray gun 8 is gradually inserted into the cleaning cylinder I6 from the insertion port 17 along its axis in this state f island, the paint attached to the nozzle extension IO is ejected toward the nozzle extension 10. The nozzle extension 1 is gradually removed from the tip side of the nozzle extension IO by being melted by the thinner and blown away by the ejection pressure, and the entire length of the nozzle extension IO is cleaned.
The paint removed from the paint mixes with the thinner spouted from the thinner spouting nozzle 27 and flows along the inner peripheral surface of the cleaning cylinder 16, thereby being stored in the recovery tank 24, which is a supply source of cleaning thinner. Ru.

After the paint is removed from the nozzle extension ■0, the ejection of thinner is stopped in response to a signal from the painting robot ■, and at the same time, the on-off valve 45 is opened to allow the pressurized air from each dryer 40 to be ejected. Pressurized air is ejected from the nozzle 41 toward the nozzle extension IO, and in this state, the spray gun 8 is moved to the cleaning section by the driving of the painting robot l! When the nozzle extension IO is gradually pulled out from inside the nozzle extension 6, the thinner remaining on the outer peripheral surface of the nozzle extension 10 is evaporated by the pressurized air flow, and the nozzle extension IO is sequentially dried from its base end, and the spray gun 8 is removed from the cleaning rR16. After that, stop blowing out the pressurized air and change the direction of the spray gun 8 toward the conveyor 2.
By switching to the side, the painting operation is restarted, and by repeating the above operation, it is possible to prevent a large amount of paint from adhering to the nozzle extension lO and dripping onto the surface to be painted, resulting in a good finish. Painting can be continued.

In this embodiment, the cleaning tube 16 is provided with a nozzle 41 for blowing pressurized air to dry the nozzle extension IO wetted with thinner after paint removal. This prevents the paint from dripping from the nozzle extension 10 onto the surface to be coated and causing coating defects.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway side view, and FIG. 2 is a partially cutaway side view thereof. ! : Painting robot 8 varnish spray gun! 0: Nozzle extension i5: Cleaning device l6: Cleaning cylinder 17
: Insertion port 24: Recovery tank 27: Nozzle for ejecting thinner 30: Bump 35: Filter 41: Nozzle for ejecting pressurized air 2L 2 objects to be painted

Claims (1)

[Scope of Claims] 1. A device for cleaning a paint jetting nozzle of a painting robot, which supports a spray gun equipped with a paint jetting nozzle so as to be movable in a three-dimensional direction, the device having an insertion port at one end. A thinner jetting nozzle is attached to the formed cleaning cylinder so as to face the inside of the cleaning cylinder, and a pump for pumping thinner is interposed between the thinner jetting nozzle and a recovery tank communicating with the cleaning cylinder. A spray gun cleaning device 2 for a painting robot, characterized in that a spray gun cleaning device 2 for a painting robot according to claim 1, characterized in that a pressurized air jetting nozzle is attached to the cleaning cylinder so as to face the inside of the cleaning cylinder. Robot spray gun cleaning equipment